1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 V4L2 controls framework implementation.
4
5 Copyright (C) 2010 Hans Verkuil <hverkuil@xs4all.nl>
6
7 */
8
9 #define pr_fmt(fmt) "v4l2-ctrls: " fmt
10
11 #include <linux/ctype.h>
12 #include <linux/export.h>
13 #include <linux/mm.h>
14 #include <linux/slab.h>
15 #include <media/v4l2-ctrls.h>
16 #include <media/v4l2-dev.h>
17 #include <media/v4l2-device.h>
18 #include <media/v4l2-event.h>
19 #include <media/v4l2-fwnode.h>
20 #include <media/v4l2-ioctl.h>
21
22 #define dprintk(vdev, fmt, arg...) do { \
23 if (!WARN_ON(!(vdev)) && ((vdev)->dev_debug & V4L2_DEV_DEBUG_CTRL)) \
24 printk(KERN_DEBUG pr_fmt("%s: %s: " fmt), \
25 __func__, video_device_node_name(vdev), ##arg); \
26 } while (0)
27
28 #define has_op(master, op) \
29 (master->ops && master->ops->op)
30 #define call_op(master, op) \
31 (has_op(master, op) ? master->ops->op(master) : 0)
32
33 static const union v4l2_ctrl_ptr ptr_null;
34
35 /* Internal temporary helper struct, one for each v4l2_ext_control */
36 struct v4l2_ctrl_helper {
37 /* Pointer to the control reference of the master control */
38 struct v4l2_ctrl_ref *mref;
39 /* The control ref corresponding to the v4l2_ext_control ID field. */
40 struct v4l2_ctrl_ref *ref;
41 /* v4l2_ext_control index of the next control belonging to the
42 same cluster, or 0 if there isn't any. */
43 u32 next;
44 };
45
46 /* Small helper function to determine if the autocluster is set to manual
47 mode. */
is_cur_manual(const struct v4l2_ctrl * master)48 static bool is_cur_manual(const struct v4l2_ctrl *master)
49 {
50 return master->is_auto && master->cur.val == master->manual_mode_value;
51 }
52
53 /* Same as above, but this checks the against the new value instead of the
54 current value. */
is_new_manual(const struct v4l2_ctrl * master)55 static bool is_new_manual(const struct v4l2_ctrl *master)
56 {
57 return master->is_auto && master->val == master->manual_mode_value;
58 }
59
60 /* Returns NULL or a character pointer array containing the menu for
61 the given control ID. The pointer array ends with a NULL pointer.
62 An empty string signifies a menu entry that is invalid. This allows
63 drivers to disable certain options if it is not supported. */
v4l2_ctrl_get_menu(u32 id)64 const char * const *v4l2_ctrl_get_menu(u32 id)
65 {
66 static const char * const mpeg_audio_sampling_freq[] = {
67 "44.1 kHz",
68 "48 kHz",
69 "32 kHz",
70 NULL
71 };
72 static const char * const mpeg_audio_encoding[] = {
73 "MPEG-1/2 Layer I",
74 "MPEG-1/2 Layer II",
75 "MPEG-1/2 Layer III",
76 "MPEG-2/4 AAC",
77 "AC-3",
78 NULL
79 };
80 static const char * const mpeg_audio_l1_bitrate[] = {
81 "32 kbps",
82 "64 kbps",
83 "96 kbps",
84 "128 kbps",
85 "160 kbps",
86 "192 kbps",
87 "224 kbps",
88 "256 kbps",
89 "288 kbps",
90 "320 kbps",
91 "352 kbps",
92 "384 kbps",
93 "416 kbps",
94 "448 kbps",
95 NULL
96 };
97 static const char * const mpeg_audio_l2_bitrate[] = {
98 "32 kbps",
99 "48 kbps",
100 "56 kbps",
101 "64 kbps",
102 "80 kbps",
103 "96 kbps",
104 "112 kbps",
105 "128 kbps",
106 "160 kbps",
107 "192 kbps",
108 "224 kbps",
109 "256 kbps",
110 "320 kbps",
111 "384 kbps",
112 NULL
113 };
114 static const char * const mpeg_audio_l3_bitrate[] = {
115 "32 kbps",
116 "40 kbps",
117 "48 kbps",
118 "56 kbps",
119 "64 kbps",
120 "80 kbps",
121 "96 kbps",
122 "112 kbps",
123 "128 kbps",
124 "160 kbps",
125 "192 kbps",
126 "224 kbps",
127 "256 kbps",
128 "320 kbps",
129 NULL
130 };
131 static const char * const mpeg_audio_ac3_bitrate[] = {
132 "32 kbps",
133 "40 kbps",
134 "48 kbps",
135 "56 kbps",
136 "64 kbps",
137 "80 kbps",
138 "96 kbps",
139 "112 kbps",
140 "128 kbps",
141 "160 kbps",
142 "192 kbps",
143 "224 kbps",
144 "256 kbps",
145 "320 kbps",
146 "384 kbps",
147 "448 kbps",
148 "512 kbps",
149 "576 kbps",
150 "640 kbps",
151 NULL
152 };
153 static const char * const mpeg_audio_mode[] = {
154 "Stereo",
155 "Joint Stereo",
156 "Dual",
157 "Mono",
158 NULL
159 };
160 static const char * const mpeg_audio_mode_extension[] = {
161 "Bound 4",
162 "Bound 8",
163 "Bound 12",
164 "Bound 16",
165 NULL
166 };
167 static const char * const mpeg_audio_emphasis[] = {
168 "No Emphasis",
169 "50/15 us",
170 "CCITT J17",
171 NULL
172 };
173 static const char * const mpeg_audio_crc[] = {
174 "No CRC",
175 "16-bit CRC",
176 NULL
177 };
178 static const char * const mpeg_audio_dec_playback[] = {
179 "Auto",
180 "Stereo",
181 "Left",
182 "Right",
183 "Mono",
184 "Swapped Stereo",
185 NULL
186 };
187 static const char * const mpeg_video_encoding[] = {
188 "MPEG-1",
189 "MPEG-2",
190 "MPEG-4 AVC",
191 NULL
192 };
193 static const char * const mpeg_video_aspect[] = {
194 "1x1",
195 "4x3",
196 "16x9",
197 "2.21x1",
198 NULL
199 };
200 static const char * const mpeg_video_bitrate_mode[] = {
201 "Variable Bitrate",
202 "Constant Bitrate",
203 "Constant Quality",
204 NULL
205 };
206 static const char * const mpeg_stream_type[] = {
207 "MPEG-2 Program Stream",
208 "MPEG-2 Transport Stream",
209 "MPEG-1 System Stream",
210 "MPEG-2 DVD-compatible Stream",
211 "MPEG-1 VCD-compatible Stream",
212 "MPEG-2 SVCD-compatible Stream",
213 NULL
214 };
215 static const char * const mpeg_stream_vbi_fmt[] = {
216 "No VBI",
217 "Private Packet, IVTV Format",
218 NULL
219 };
220 static const char * const camera_power_line_frequency[] = {
221 "Disabled",
222 "50 Hz",
223 "60 Hz",
224 "Auto",
225 NULL
226 };
227 static const char * const camera_exposure_auto[] = {
228 "Auto Mode",
229 "Manual Mode",
230 "Shutter Priority Mode",
231 "Aperture Priority Mode",
232 NULL
233 };
234 static const char * const camera_exposure_metering[] = {
235 "Average",
236 "Center Weighted",
237 "Spot",
238 "Matrix",
239 NULL
240 };
241 static const char * const camera_auto_focus_range[] = {
242 "Auto",
243 "Normal",
244 "Macro",
245 "Infinity",
246 NULL
247 };
248 static const char * const colorfx[] = {
249 "None",
250 "Black & White",
251 "Sepia",
252 "Negative",
253 "Emboss",
254 "Sketch",
255 "Sky Blue",
256 "Grass Green",
257 "Skin Whiten",
258 "Vivid",
259 "Aqua",
260 "Art Freeze",
261 "Silhouette",
262 "Solarization",
263 "Antique",
264 "Set Cb/Cr",
265 NULL
266 };
267 static const char * const auto_n_preset_white_balance[] = {
268 "Manual",
269 "Auto",
270 "Incandescent",
271 "Fluorescent",
272 "Fluorescent H",
273 "Horizon",
274 "Daylight",
275 "Flash",
276 "Cloudy",
277 "Shade",
278 NULL,
279 };
280 static const char * const camera_iso_sensitivity_auto[] = {
281 "Manual",
282 "Auto",
283 NULL
284 };
285 static const char * const scene_mode[] = {
286 "None",
287 "Backlight",
288 "Beach/Snow",
289 "Candle Light",
290 "Dusk/Dawn",
291 "Fall Colors",
292 "Fireworks",
293 "Landscape",
294 "Night",
295 "Party/Indoor",
296 "Portrait",
297 "Sports",
298 "Sunset",
299 "Text",
300 NULL
301 };
302 static const char * const tune_emphasis[] = {
303 "None",
304 "50 Microseconds",
305 "75 Microseconds",
306 NULL,
307 };
308 static const char * const header_mode[] = {
309 "Separate Buffer",
310 "Joined With 1st Frame",
311 NULL,
312 };
313 static const char * const multi_slice[] = {
314 "Single",
315 "Max Macroblocks",
316 "Max Bytes",
317 NULL,
318 };
319 static const char * const entropy_mode[] = {
320 "CAVLC",
321 "CABAC",
322 NULL,
323 };
324 static const char * const mpeg_h264_level[] = {
325 "1",
326 "1b",
327 "1.1",
328 "1.2",
329 "1.3",
330 "2",
331 "2.1",
332 "2.2",
333 "3",
334 "3.1",
335 "3.2",
336 "4",
337 "4.1",
338 "4.2",
339 "5",
340 "5.1",
341 "5.2",
342 "6.0",
343 "6.1",
344 "6.2",
345 NULL,
346 };
347 static const char * const h264_loop_filter[] = {
348 "Enabled",
349 "Disabled",
350 "Disabled at Slice Boundary",
351 NULL,
352 };
353 static const char * const h264_profile[] = {
354 "Baseline",
355 "Constrained Baseline",
356 "Main",
357 "Extended",
358 "High",
359 "High 10",
360 "High 422",
361 "High 444 Predictive",
362 "High 10 Intra",
363 "High 422 Intra",
364 "High 444 Intra",
365 "CAVLC 444 Intra",
366 "Scalable Baseline",
367 "Scalable High",
368 "Scalable High Intra",
369 "Stereo High",
370 "Multiview High",
371 "Constrained High",
372 NULL,
373 };
374 static const char * const vui_sar_idc[] = {
375 "Unspecified",
376 "1:1",
377 "12:11",
378 "10:11",
379 "16:11",
380 "40:33",
381 "24:11",
382 "20:11",
383 "32:11",
384 "80:33",
385 "18:11",
386 "15:11",
387 "64:33",
388 "160:99",
389 "4:3",
390 "3:2",
391 "2:1",
392 "Extended SAR",
393 NULL,
394 };
395 static const char * const h264_fp_arrangement_type[] = {
396 "Checkerboard",
397 "Column",
398 "Row",
399 "Side by Side",
400 "Top Bottom",
401 "Temporal",
402 NULL,
403 };
404 static const char * const h264_fmo_map_type[] = {
405 "Interleaved Slices",
406 "Scattered Slices",
407 "Foreground with Leftover",
408 "Box Out",
409 "Raster Scan",
410 "Wipe Scan",
411 "Explicit",
412 NULL,
413 };
414 static const char * const h264_decode_mode[] = {
415 "Slice-Based",
416 "Frame-Based",
417 NULL,
418 };
419 static const char * const h264_start_code[] = {
420 "No Start Code",
421 "Annex B Start Code",
422 NULL,
423 };
424 static const char * const mpeg_mpeg2_level[] = {
425 "Low",
426 "Main",
427 "High 1440",
428 "High",
429 NULL,
430 };
431 static const char * const mpeg2_profile[] = {
432 "Simple",
433 "Main",
434 "SNR Scalable",
435 "Spatially Scalable",
436 "High",
437 NULL,
438 };
439 static const char * const mpeg_mpeg4_level[] = {
440 "0",
441 "0b",
442 "1",
443 "2",
444 "3",
445 "3b",
446 "4",
447 "5",
448 NULL,
449 };
450 static const char * const mpeg4_profile[] = {
451 "Simple",
452 "Advanced Simple",
453 "Core",
454 "Simple Scalable",
455 "Advanced Coding Efficiency",
456 NULL,
457 };
458
459 static const char * const vpx_golden_frame_sel[] = {
460 "Use Previous Frame",
461 "Use Previous Specific Frame",
462 NULL,
463 };
464 static const char * const vp8_profile[] = {
465 "0",
466 "1",
467 "2",
468 "3",
469 NULL,
470 };
471 static const char * const vp9_profile[] = {
472 "0",
473 "1",
474 "2",
475 "3",
476 NULL,
477 };
478 static const char * const vp9_level[] = {
479 "1",
480 "1.1",
481 "2",
482 "2.1",
483 "3",
484 "3.1",
485 "4",
486 "4.1",
487 "5",
488 "5.1",
489 "5.2",
490 "6",
491 "6.1",
492 "6.2",
493 NULL,
494 };
495
496 static const char * const flash_led_mode[] = {
497 "Off",
498 "Flash",
499 "Torch",
500 NULL,
501 };
502 static const char * const flash_strobe_source[] = {
503 "Software",
504 "External",
505 NULL,
506 };
507
508 static const char * const jpeg_chroma_subsampling[] = {
509 "4:4:4",
510 "4:2:2",
511 "4:2:0",
512 "4:1:1",
513 "4:1:0",
514 "Gray",
515 NULL,
516 };
517 static const char * const dv_tx_mode[] = {
518 "DVI-D",
519 "HDMI",
520 NULL,
521 };
522 static const char * const dv_rgb_range[] = {
523 "Automatic",
524 "RGB Limited Range (16-235)",
525 "RGB Full Range (0-255)",
526 NULL,
527 };
528 static const char * const dv_it_content_type[] = {
529 "Graphics",
530 "Photo",
531 "Cinema",
532 "Game",
533 "No IT Content",
534 NULL,
535 };
536 static const char * const detect_md_mode[] = {
537 "Disabled",
538 "Global",
539 "Threshold Grid",
540 "Region Grid",
541 NULL,
542 };
543
544 static const char * const hevc_profile[] = {
545 "Main",
546 "Main Still Picture",
547 "Main 10",
548 NULL,
549 };
550 static const char * const hevc_level[] = {
551 "1",
552 "2",
553 "2.1",
554 "3",
555 "3.1",
556 "4",
557 "4.1",
558 "5",
559 "5.1",
560 "5.2",
561 "6",
562 "6.1",
563 "6.2",
564 NULL,
565 };
566 static const char * const hevc_hierarchial_coding_type[] = {
567 "B",
568 "P",
569 NULL,
570 };
571 static const char * const hevc_refresh_type[] = {
572 "None",
573 "CRA",
574 "IDR",
575 NULL,
576 };
577 static const char * const hevc_size_of_length_field[] = {
578 "0",
579 "1",
580 "2",
581 "4",
582 NULL,
583 };
584 static const char * const hevc_tier[] = {
585 "Main",
586 "High",
587 NULL,
588 };
589 static const char * const hevc_loop_filter_mode[] = {
590 "Disabled",
591 "Enabled",
592 "Disabled at slice boundary",
593 "NULL",
594 };
595 static const char * const hevc_decode_mode[] = {
596 "Slice-Based",
597 "Frame-Based",
598 NULL,
599 };
600 static const char * const hevc_start_code[] = {
601 "No Start Code",
602 "Annex B Start Code",
603 NULL,
604 };
605 static const char * const camera_orientation[] = {
606 "Front",
607 "Back",
608 "External",
609 NULL,
610 };
611 static const char * const mpeg_video_frame_skip[] = {
612 "Disabled",
613 "Level Limit",
614 "VBV/CPB Limit",
615 NULL,
616 };
617
618 switch (id) {
619 case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ:
620 return mpeg_audio_sampling_freq;
621 case V4L2_CID_MPEG_AUDIO_ENCODING:
622 return mpeg_audio_encoding;
623 case V4L2_CID_MPEG_AUDIO_L1_BITRATE:
624 return mpeg_audio_l1_bitrate;
625 case V4L2_CID_MPEG_AUDIO_L2_BITRATE:
626 return mpeg_audio_l2_bitrate;
627 case V4L2_CID_MPEG_AUDIO_L3_BITRATE:
628 return mpeg_audio_l3_bitrate;
629 case V4L2_CID_MPEG_AUDIO_AC3_BITRATE:
630 return mpeg_audio_ac3_bitrate;
631 case V4L2_CID_MPEG_AUDIO_MODE:
632 return mpeg_audio_mode;
633 case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION:
634 return mpeg_audio_mode_extension;
635 case V4L2_CID_MPEG_AUDIO_EMPHASIS:
636 return mpeg_audio_emphasis;
637 case V4L2_CID_MPEG_AUDIO_CRC:
638 return mpeg_audio_crc;
639 case V4L2_CID_MPEG_AUDIO_DEC_PLAYBACK:
640 case V4L2_CID_MPEG_AUDIO_DEC_MULTILINGUAL_PLAYBACK:
641 return mpeg_audio_dec_playback;
642 case V4L2_CID_MPEG_VIDEO_ENCODING:
643 return mpeg_video_encoding;
644 case V4L2_CID_MPEG_VIDEO_ASPECT:
645 return mpeg_video_aspect;
646 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
647 return mpeg_video_bitrate_mode;
648 case V4L2_CID_MPEG_STREAM_TYPE:
649 return mpeg_stream_type;
650 case V4L2_CID_MPEG_STREAM_VBI_FMT:
651 return mpeg_stream_vbi_fmt;
652 case V4L2_CID_POWER_LINE_FREQUENCY:
653 return camera_power_line_frequency;
654 case V4L2_CID_EXPOSURE_AUTO:
655 return camera_exposure_auto;
656 case V4L2_CID_EXPOSURE_METERING:
657 return camera_exposure_metering;
658 case V4L2_CID_AUTO_FOCUS_RANGE:
659 return camera_auto_focus_range;
660 case V4L2_CID_COLORFX:
661 return colorfx;
662 case V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE:
663 return auto_n_preset_white_balance;
664 case V4L2_CID_ISO_SENSITIVITY_AUTO:
665 return camera_iso_sensitivity_auto;
666 case V4L2_CID_SCENE_MODE:
667 return scene_mode;
668 case V4L2_CID_TUNE_PREEMPHASIS:
669 return tune_emphasis;
670 case V4L2_CID_TUNE_DEEMPHASIS:
671 return tune_emphasis;
672 case V4L2_CID_FLASH_LED_MODE:
673 return flash_led_mode;
674 case V4L2_CID_FLASH_STROBE_SOURCE:
675 return flash_strobe_source;
676 case V4L2_CID_MPEG_VIDEO_HEADER_MODE:
677 return header_mode;
678 case V4L2_CID_MPEG_VIDEO_FRAME_SKIP_MODE:
679 return mpeg_video_frame_skip;
680 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE:
681 return multi_slice;
682 case V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE:
683 return entropy_mode;
684 case V4L2_CID_MPEG_VIDEO_H264_LEVEL:
685 return mpeg_h264_level;
686 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE:
687 return h264_loop_filter;
688 case V4L2_CID_MPEG_VIDEO_H264_PROFILE:
689 return h264_profile;
690 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC:
691 return vui_sar_idc;
692 case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE:
693 return h264_fp_arrangement_type;
694 case V4L2_CID_MPEG_VIDEO_H264_FMO_MAP_TYPE:
695 return h264_fmo_map_type;
696 case V4L2_CID_MPEG_VIDEO_H264_DECODE_MODE:
697 return h264_decode_mode;
698 case V4L2_CID_MPEG_VIDEO_H264_START_CODE:
699 return h264_start_code;
700 case V4L2_CID_MPEG_VIDEO_MPEG2_LEVEL:
701 return mpeg_mpeg2_level;
702 case V4L2_CID_MPEG_VIDEO_MPEG2_PROFILE:
703 return mpeg2_profile;
704 case V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL:
705 return mpeg_mpeg4_level;
706 case V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE:
707 return mpeg4_profile;
708 case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_SEL:
709 return vpx_golden_frame_sel;
710 case V4L2_CID_MPEG_VIDEO_VP8_PROFILE:
711 return vp8_profile;
712 case V4L2_CID_MPEG_VIDEO_VP9_PROFILE:
713 return vp9_profile;
714 case V4L2_CID_MPEG_VIDEO_VP9_LEVEL:
715 return vp9_level;
716 case V4L2_CID_JPEG_CHROMA_SUBSAMPLING:
717 return jpeg_chroma_subsampling;
718 case V4L2_CID_DV_TX_MODE:
719 return dv_tx_mode;
720 case V4L2_CID_DV_TX_RGB_RANGE:
721 case V4L2_CID_DV_RX_RGB_RANGE:
722 return dv_rgb_range;
723 case V4L2_CID_DV_TX_IT_CONTENT_TYPE:
724 case V4L2_CID_DV_RX_IT_CONTENT_TYPE:
725 return dv_it_content_type;
726 case V4L2_CID_DETECT_MD_MODE:
727 return detect_md_mode;
728 case V4L2_CID_MPEG_VIDEO_HEVC_PROFILE:
729 return hevc_profile;
730 case V4L2_CID_MPEG_VIDEO_HEVC_LEVEL:
731 return hevc_level;
732 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_TYPE:
733 return hevc_hierarchial_coding_type;
734 case V4L2_CID_MPEG_VIDEO_HEVC_REFRESH_TYPE:
735 return hevc_refresh_type;
736 case V4L2_CID_MPEG_VIDEO_HEVC_SIZE_OF_LENGTH_FIELD:
737 return hevc_size_of_length_field;
738 case V4L2_CID_MPEG_VIDEO_HEVC_TIER:
739 return hevc_tier;
740 case V4L2_CID_MPEG_VIDEO_HEVC_LOOP_FILTER_MODE:
741 return hevc_loop_filter_mode;
742 case V4L2_CID_MPEG_VIDEO_HEVC_DECODE_MODE:
743 return hevc_decode_mode;
744 case V4L2_CID_MPEG_VIDEO_HEVC_START_CODE:
745 return hevc_start_code;
746 case V4L2_CID_CAMERA_ORIENTATION:
747 return camera_orientation;
748 default:
749 return NULL;
750 }
751 }
752 EXPORT_SYMBOL(v4l2_ctrl_get_menu);
753
754 #define __v4l2_qmenu_int_len(arr, len) ({ *(len) = ARRAY_SIZE(arr); arr; })
755 /*
756 * Returns NULL or an s64 type array containing the menu for given
757 * control ID. The total number of the menu items is returned in @len.
758 */
v4l2_ctrl_get_int_menu(u32 id,u32 * len)759 const s64 *v4l2_ctrl_get_int_menu(u32 id, u32 *len)
760 {
761 static const s64 qmenu_int_vpx_num_partitions[] = {
762 1, 2, 4, 8,
763 };
764
765 static const s64 qmenu_int_vpx_num_ref_frames[] = {
766 1, 2, 3,
767 };
768
769 switch (id) {
770 case V4L2_CID_MPEG_VIDEO_VPX_NUM_PARTITIONS:
771 return __v4l2_qmenu_int_len(qmenu_int_vpx_num_partitions, len);
772 case V4L2_CID_MPEG_VIDEO_VPX_NUM_REF_FRAMES:
773 return __v4l2_qmenu_int_len(qmenu_int_vpx_num_ref_frames, len);
774 default:
775 *len = 0;
776 return NULL;
777 }
778 }
779 EXPORT_SYMBOL(v4l2_ctrl_get_int_menu);
780
781 /* Return the control name. */
v4l2_ctrl_get_name(u32 id)782 const char *v4l2_ctrl_get_name(u32 id)
783 {
784 switch (id) {
785 /* USER controls */
786 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
787 case V4L2_CID_USER_CLASS: return "User Controls";
788 case V4L2_CID_BRIGHTNESS: return "Brightness";
789 case V4L2_CID_CONTRAST: return "Contrast";
790 case V4L2_CID_SATURATION: return "Saturation";
791 case V4L2_CID_HUE: return "Hue";
792 case V4L2_CID_AUDIO_VOLUME: return "Volume";
793 case V4L2_CID_AUDIO_BALANCE: return "Balance";
794 case V4L2_CID_AUDIO_BASS: return "Bass";
795 case V4L2_CID_AUDIO_TREBLE: return "Treble";
796 case V4L2_CID_AUDIO_MUTE: return "Mute";
797 case V4L2_CID_AUDIO_LOUDNESS: return "Loudness";
798 case V4L2_CID_BLACK_LEVEL: return "Black Level";
799 case V4L2_CID_AUTO_WHITE_BALANCE: return "White Balance, Automatic";
800 case V4L2_CID_DO_WHITE_BALANCE: return "Do White Balance";
801 case V4L2_CID_RED_BALANCE: return "Red Balance";
802 case V4L2_CID_BLUE_BALANCE: return "Blue Balance";
803 case V4L2_CID_GAMMA: return "Gamma";
804 case V4L2_CID_EXPOSURE: return "Exposure";
805 case V4L2_CID_AUTOGAIN: return "Gain, Automatic";
806 case V4L2_CID_GAIN: return "Gain";
807 case V4L2_CID_HFLIP: return "Horizontal Flip";
808 case V4L2_CID_VFLIP: return "Vertical Flip";
809 case V4L2_CID_POWER_LINE_FREQUENCY: return "Power Line Frequency";
810 case V4L2_CID_HUE_AUTO: return "Hue, Automatic";
811 case V4L2_CID_WHITE_BALANCE_TEMPERATURE: return "White Balance Temperature";
812 case V4L2_CID_SHARPNESS: return "Sharpness";
813 case V4L2_CID_BACKLIGHT_COMPENSATION: return "Backlight Compensation";
814 case V4L2_CID_CHROMA_AGC: return "Chroma AGC";
815 case V4L2_CID_COLOR_KILLER: return "Color Killer";
816 case V4L2_CID_COLORFX: return "Color Effects";
817 case V4L2_CID_AUTOBRIGHTNESS: return "Brightness, Automatic";
818 case V4L2_CID_BAND_STOP_FILTER: return "Band-Stop Filter";
819 case V4L2_CID_ROTATE: return "Rotate";
820 case V4L2_CID_BG_COLOR: return "Background Color";
821 case V4L2_CID_CHROMA_GAIN: return "Chroma Gain";
822 case V4L2_CID_ILLUMINATORS_1: return "Illuminator 1";
823 case V4L2_CID_ILLUMINATORS_2: return "Illuminator 2";
824 case V4L2_CID_MIN_BUFFERS_FOR_CAPTURE: return "Min Number of Capture Buffers";
825 case V4L2_CID_MIN_BUFFERS_FOR_OUTPUT: return "Min Number of Output Buffers";
826 case V4L2_CID_ALPHA_COMPONENT: return "Alpha Component";
827 case V4L2_CID_COLORFX_CBCR: return "Color Effects, CbCr";
828
829 /* Codec controls */
830 /* The MPEG controls are applicable to all codec controls
831 * and the 'MPEG' part of the define is historical */
832 /* Keep the order of the 'case's the same as in videodev2.h! */
833 case V4L2_CID_MPEG_CLASS: return "Codec Controls";
834 case V4L2_CID_MPEG_STREAM_TYPE: return "Stream Type";
835 case V4L2_CID_MPEG_STREAM_PID_PMT: return "Stream PMT Program ID";
836 case V4L2_CID_MPEG_STREAM_PID_AUDIO: return "Stream Audio Program ID";
837 case V4L2_CID_MPEG_STREAM_PID_VIDEO: return "Stream Video Program ID";
838 case V4L2_CID_MPEG_STREAM_PID_PCR: return "Stream PCR Program ID";
839 case V4L2_CID_MPEG_STREAM_PES_ID_AUDIO: return "Stream PES Audio ID";
840 case V4L2_CID_MPEG_STREAM_PES_ID_VIDEO: return "Stream PES Video ID";
841 case V4L2_CID_MPEG_STREAM_VBI_FMT: return "Stream VBI Format";
842 case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ: return "Audio Sampling Frequency";
843 case V4L2_CID_MPEG_AUDIO_ENCODING: return "Audio Encoding";
844 case V4L2_CID_MPEG_AUDIO_L1_BITRATE: return "Audio Layer I Bitrate";
845 case V4L2_CID_MPEG_AUDIO_L2_BITRATE: return "Audio Layer II Bitrate";
846 case V4L2_CID_MPEG_AUDIO_L3_BITRATE: return "Audio Layer III Bitrate";
847 case V4L2_CID_MPEG_AUDIO_MODE: return "Audio Stereo Mode";
848 case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION: return "Audio Stereo Mode Extension";
849 case V4L2_CID_MPEG_AUDIO_EMPHASIS: return "Audio Emphasis";
850 case V4L2_CID_MPEG_AUDIO_CRC: return "Audio CRC";
851 case V4L2_CID_MPEG_AUDIO_MUTE: return "Audio Mute";
852 case V4L2_CID_MPEG_AUDIO_AAC_BITRATE: return "Audio AAC Bitrate";
853 case V4L2_CID_MPEG_AUDIO_AC3_BITRATE: return "Audio AC-3 Bitrate";
854 case V4L2_CID_MPEG_AUDIO_DEC_PLAYBACK: return "Audio Playback";
855 case V4L2_CID_MPEG_AUDIO_DEC_MULTILINGUAL_PLAYBACK: return "Audio Multilingual Playback";
856 case V4L2_CID_MPEG_VIDEO_ENCODING: return "Video Encoding";
857 case V4L2_CID_MPEG_VIDEO_ASPECT: return "Video Aspect";
858 case V4L2_CID_MPEG_VIDEO_B_FRAMES: return "Video B Frames";
859 case V4L2_CID_MPEG_VIDEO_GOP_SIZE: return "Video GOP Size";
860 case V4L2_CID_MPEG_VIDEO_GOP_CLOSURE: return "Video GOP Closure";
861 case V4L2_CID_MPEG_VIDEO_PULLDOWN: return "Video Pulldown";
862 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE: return "Video Bitrate Mode";
863 case V4L2_CID_MPEG_VIDEO_CONSTANT_QUALITY: return "Constant Quality";
864 case V4L2_CID_MPEG_VIDEO_BITRATE: return "Video Bitrate";
865 case V4L2_CID_MPEG_VIDEO_BITRATE_PEAK: return "Video Peak Bitrate";
866 case V4L2_CID_MPEG_VIDEO_TEMPORAL_DECIMATION: return "Video Temporal Decimation";
867 case V4L2_CID_MPEG_VIDEO_MUTE: return "Video Mute";
868 case V4L2_CID_MPEG_VIDEO_MUTE_YUV: return "Video Mute YUV";
869 case V4L2_CID_MPEG_VIDEO_DECODER_SLICE_INTERFACE: return "Decoder Slice Interface";
870 case V4L2_CID_MPEG_VIDEO_DECODER_MPEG4_DEBLOCK_FILTER: return "MPEG4 Loop Filter Enable";
871 case V4L2_CID_MPEG_VIDEO_CYCLIC_INTRA_REFRESH_MB: return "Number of Intra Refresh MBs";
872 case V4L2_CID_MPEG_VIDEO_FRAME_RC_ENABLE: return "Frame Level Rate Control Enable";
873 case V4L2_CID_MPEG_VIDEO_MB_RC_ENABLE: return "H264 MB Level Rate Control";
874 case V4L2_CID_MPEG_VIDEO_HEADER_MODE: return "Sequence Header Mode";
875 case V4L2_CID_MPEG_VIDEO_MAX_REF_PIC: return "Max Number of Reference Pics";
876 case V4L2_CID_MPEG_VIDEO_FRAME_SKIP_MODE: return "Frame Skip Mode";
877 case V4L2_CID_MPEG_VIDEO_H263_I_FRAME_QP: return "H263 I-Frame QP Value";
878 case V4L2_CID_MPEG_VIDEO_H263_P_FRAME_QP: return "H263 P-Frame QP Value";
879 case V4L2_CID_MPEG_VIDEO_H263_B_FRAME_QP: return "H263 B-Frame QP Value";
880 case V4L2_CID_MPEG_VIDEO_H263_MIN_QP: return "H263 Minimum QP Value";
881 case V4L2_CID_MPEG_VIDEO_H263_MAX_QP: return "H263 Maximum QP Value";
882 case V4L2_CID_MPEG_VIDEO_H264_I_FRAME_QP: return "H264 I-Frame QP Value";
883 case V4L2_CID_MPEG_VIDEO_H264_P_FRAME_QP: return "H264 P-Frame QP Value";
884 case V4L2_CID_MPEG_VIDEO_H264_B_FRAME_QP: return "H264 B-Frame QP Value";
885 case V4L2_CID_MPEG_VIDEO_H264_MAX_QP: return "H264 Maximum QP Value";
886 case V4L2_CID_MPEG_VIDEO_H264_MIN_QP: return "H264 Minimum QP Value";
887 case V4L2_CID_MPEG_VIDEO_H264_8X8_TRANSFORM: return "H264 8x8 Transform Enable";
888 case V4L2_CID_MPEG_VIDEO_H264_CPB_SIZE: return "H264 CPB Buffer Size";
889 case V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE: return "H264 Entropy Mode";
890 case V4L2_CID_MPEG_VIDEO_H264_I_PERIOD: return "H264 I-Frame Period";
891 case V4L2_CID_MPEG_VIDEO_H264_LEVEL: return "H264 Level";
892 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_ALPHA: return "H264 Loop Filter Alpha Offset";
893 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_BETA: return "H264 Loop Filter Beta Offset";
894 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE: return "H264 Loop Filter Mode";
895 case V4L2_CID_MPEG_VIDEO_H264_PROFILE: return "H264 Profile";
896 case V4L2_CID_MPEG_VIDEO_H264_VUI_EXT_SAR_HEIGHT: return "Vertical Size of SAR";
897 case V4L2_CID_MPEG_VIDEO_H264_VUI_EXT_SAR_WIDTH: return "Horizontal Size of SAR";
898 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_ENABLE: return "Aspect Ratio VUI Enable";
899 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC: return "VUI Aspect Ratio IDC";
900 case V4L2_CID_MPEG_VIDEO_H264_SEI_FRAME_PACKING: return "H264 Enable Frame Packing SEI";
901 case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_CURRENT_FRAME_0: return "H264 Set Curr. Frame as Frame0";
902 case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE: return "H264 FP Arrangement Type";
903 case V4L2_CID_MPEG_VIDEO_H264_FMO: return "H264 Flexible MB Ordering";
904 case V4L2_CID_MPEG_VIDEO_H264_FMO_MAP_TYPE: return "H264 Map Type for FMO";
905 case V4L2_CID_MPEG_VIDEO_H264_FMO_SLICE_GROUP: return "H264 FMO Number of Slice Groups";
906 case V4L2_CID_MPEG_VIDEO_H264_FMO_CHANGE_DIRECTION: return "H264 FMO Direction of Change";
907 case V4L2_CID_MPEG_VIDEO_H264_FMO_CHANGE_RATE: return "H264 FMO Size of 1st Slice Grp";
908 case V4L2_CID_MPEG_VIDEO_H264_FMO_RUN_LENGTH: return "H264 FMO No. of Consecutive MBs";
909 case V4L2_CID_MPEG_VIDEO_H264_ASO: return "H264 Arbitrary Slice Ordering";
910 case V4L2_CID_MPEG_VIDEO_H264_ASO_SLICE_ORDER: return "H264 ASO Slice Order";
911 case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING: return "Enable H264 Hierarchical Coding";
912 case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_TYPE: return "H264 Hierarchical Coding Type";
913 case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_LAYER:return "H264 Number of HC Layers";
914 case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_LAYER_QP:
915 return "H264 Set QP Value for HC Layers";
916 case V4L2_CID_MPEG_VIDEO_H264_CONSTRAINED_INTRA_PREDICTION:
917 return "H264 Constrained Intra Pred";
918 case V4L2_CID_MPEG_VIDEO_H264_CHROMA_QP_INDEX_OFFSET: return "H264 Chroma QP Index Offset";
919 case V4L2_CID_MPEG_VIDEO_H264_I_FRAME_MIN_QP: return "H264 I-Frame Minimum QP Value";
920 case V4L2_CID_MPEG_VIDEO_H264_I_FRAME_MAX_QP: return "H264 I-Frame Maximum QP Value";
921 case V4L2_CID_MPEG_VIDEO_H264_P_FRAME_MIN_QP: return "H264 P-Frame Minimum QP Value";
922 case V4L2_CID_MPEG_VIDEO_H264_P_FRAME_MAX_QP: return "H264 P-Frame Maximum QP Value";
923 case V4L2_CID_MPEG_VIDEO_H264_SPS: return "H264 Sequence Parameter Set";
924 case V4L2_CID_MPEG_VIDEO_H264_PPS: return "H264 Picture Parameter Set";
925 case V4L2_CID_MPEG_VIDEO_H264_SCALING_MATRIX: return "H264 Scaling Matrix";
926 case V4L2_CID_MPEG_VIDEO_H264_SLICE_PARAMS: return "H264 Slice Parameters";
927 case V4L2_CID_MPEG_VIDEO_H264_DECODE_PARAMS: return "H264 Decode Parameters";
928 case V4L2_CID_MPEG_VIDEO_H264_DECODE_MODE: return "H264 Decode Mode";
929 case V4L2_CID_MPEG_VIDEO_H264_START_CODE: return "H264 Start Code";
930 case V4L2_CID_MPEG_VIDEO_H264_PRED_WEIGHTS: return "H264 Prediction Weight Table";
931 case V4L2_CID_MPEG_VIDEO_MPEG2_LEVEL: return "MPEG2 Level";
932 case V4L2_CID_MPEG_VIDEO_MPEG2_PROFILE: return "MPEG2 Profile";
933 case V4L2_CID_MPEG_VIDEO_MPEG4_I_FRAME_QP: return "MPEG4 I-Frame QP Value";
934 case V4L2_CID_MPEG_VIDEO_MPEG4_P_FRAME_QP: return "MPEG4 P-Frame QP Value";
935 case V4L2_CID_MPEG_VIDEO_MPEG4_B_FRAME_QP: return "MPEG4 B-Frame QP Value";
936 case V4L2_CID_MPEG_VIDEO_MPEG4_MIN_QP: return "MPEG4 Minimum QP Value";
937 case V4L2_CID_MPEG_VIDEO_MPEG4_MAX_QP: return "MPEG4 Maximum QP Value";
938 case V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL: return "MPEG4 Level";
939 case V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE: return "MPEG4 Profile";
940 case V4L2_CID_MPEG_VIDEO_MPEG4_QPEL: return "Quarter Pixel Search Enable";
941 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MAX_BYTES: return "Maximum Bytes in a Slice";
942 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MAX_MB: return "Number of MBs in a Slice";
943 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE: return "Slice Partitioning Method";
944 case V4L2_CID_MPEG_VIDEO_VBV_SIZE: return "VBV Buffer Size";
945 case V4L2_CID_MPEG_VIDEO_DEC_PTS: return "Video Decoder PTS";
946 case V4L2_CID_MPEG_VIDEO_DEC_FRAME: return "Video Decoder Frame Count";
947 case V4L2_CID_MPEG_VIDEO_VBV_DELAY: return "Initial Delay for VBV Control";
948 case V4L2_CID_MPEG_VIDEO_MV_H_SEARCH_RANGE: return "Horizontal MV Search Range";
949 case V4L2_CID_MPEG_VIDEO_MV_V_SEARCH_RANGE: return "Vertical MV Search Range";
950 case V4L2_CID_MPEG_VIDEO_REPEAT_SEQ_HEADER: return "Repeat Sequence Header";
951 case V4L2_CID_MPEG_VIDEO_FORCE_KEY_FRAME: return "Force Key Frame";
952 case V4L2_CID_MPEG_VIDEO_MPEG2_SLICE_PARAMS: return "MPEG-2 Slice Parameters";
953 case V4L2_CID_MPEG_VIDEO_MPEG2_QUANTIZATION: return "MPEG-2 Quantization Matrices";
954 case V4L2_CID_MPEG_VIDEO_FWHT_PARAMS: return "FWHT Stateless Parameters";
955 case V4L2_CID_FWHT_I_FRAME_QP: return "FWHT I-Frame QP Value";
956 case V4L2_CID_FWHT_P_FRAME_QP: return "FWHT P-Frame QP Value";
957
958 /* VPX controls */
959 case V4L2_CID_MPEG_VIDEO_VPX_NUM_PARTITIONS: return "VPX Number of Partitions";
960 case V4L2_CID_MPEG_VIDEO_VPX_IMD_DISABLE_4X4: return "VPX Intra Mode Decision Disable";
961 case V4L2_CID_MPEG_VIDEO_VPX_NUM_REF_FRAMES: return "VPX No. of Refs for P Frame";
962 case V4L2_CID_MPEG_VIDEO_VPX_FILTER_LEVEL: return "VPX Loop Filter Level Range";
963 case V4L2_CID_MPEG_VIDEO_VPX_FILTER_SHARPNESS: return "VPX Deblocking Effect Control";
964 case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_REF_PERIOD: return "VPX Golden Frame Refresh Period";
965 case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_SEL: return "VPX Golden Frame Indicator";
966 case V4L2_CID_MPEG_VIDEO_VPX_MIN_QP: return "VPX Minimum QP Value";
967 case V4L2_CID_MPEG_VIDEO_VPX_MAX_QP: return "VPX Maximum QP Value";
968 case V4L2_CID_MPEG_VIDEO_VPX_I_FRAME_QP: return "VPX I-Frame QP Value";
969 case V4L2_CID_MPEG_VIDEO_VPX_P_FRAME_QP: return "VPX P-Frame QP Value";
970 case V4L2_CID_MPEG_VIDEO_VP8_PROFILE: return "VP8 Profile";
971 case V4L2_CID_MPEG_VIDEO_VP9_PROFILE: return "VP9 Profile";
972 case V4L2_CID_MPEG_VIDEO_VP9_LEVEL: return "VP9 Level";
973 case V4L2_CID_MPEG_VIDEO_VP8_FRAME_HEADER: return "VP8 Frame Header";
974
975 /* HEVC controls */
976 case V4L2_CID_MPEG_VIDEO_HEVC_I_FRAME_QP: return "HEVC I-Frame QP Value";
977 case V4L2_CID_MPEG_VIDEO_HEVC_P_FRAME_QP: return "HEVC P-Frame QP Value";
978 case V4L2_CID_MPEG_VIDEO_HEVC_B_FRAME_QP: return "HEVC B-Frame QP Value";
979 case V4L2_CID_MPEG_VIDEO_HEVC_MIN_QP: return "HEVC Minimum QP Value";
980 case V4L2_CID_MPEG_VIDEO_HEVC_MAX_QP: return "HEVC Maximum QP Value";
981 case V4L2_CID_MPEG_VIDEO_HEVC_PROFILE: return "HEVC Profile";
982 case V4L2_CID_MPEG_VIDEO_HEVC_LEVEL: return "HEVC Level";
983 case V4L2_CID_MPEG_VIDEO_HEVC_TIER: return "HEVC Tier";
984 case V4L2_CID_MPEG_VIDEO_HEVC_FRAME_RATE_RESOLUTION: return "HEVC Frame Rate Resolution";
985 case V4L2_CID_MPEG_VIDEO_HEVC_MAX_PARTITION_DEPTH: return "HEVC Maximum Coding Unit Depth";
986 case V4L2_CID_MPEG_VIDEO_HEVC_REFRESH_TYPE: return "HEVC Refresh Type";
987 case V4L2_CID_MPEG_VIDEO_HEVC_CONST_INTRA_PRED: return "HEVC Constant Intra Prediction";
988 case V4L2_CID_MPEG_VIDEO_HEVC_LOSSLESS_CU: return "HEVC Lossless Encoding";
989 case V4L2_CID_MPEG_VIDEO_HEVC_WAVEFRONT: return "HEVC Wavefront";
990 case V4L2_CID_MPEG_VIDEO_HEVC_LOOP_FILTER_MODE: return "HEVC Loop Filter";
991 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_QP: return "HEVC QP Values";
992 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_TYPE: return "HEVC Hierarchical Coding Type";
993 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_LAYER: return "HEVC Hierarchical Coding Layer";
994 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L0_QP: return "HEVC Hierarchical Layer 0 QP";
995 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L1_QP: return "HEVC Hierarchical Layer 1 QP";
996 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L2_QP: return "HEVC Hierarchical Layer 2 QP";
997 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L3_QP: return "HEVC Hierarchical Layer 3 QP";
998 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L4_QP: return "HEVC Hierarchical Layer 4 QP";
999 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L5_QP: return "HEVC Hierarchical Layer 5 QP";
1000 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L6_QP: return "HEVC Hierarchical Layer 6 QP";
1001 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L0_BR: return "HEVC Hierarchical Lay 0 BitRate";
1002 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L1_BR: return "HEVC Hierarchical Lay 1 BitRate";
1003 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L2_BR: return "HEVC Hierarchical Lay 2 BitRate";
1004 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L3_BR: return "HEVC Hierarchical Lay 3 BitRate";
1005 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L4_BR: return "HEVC Hierarchical Lay 4 BitRate";
1006 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L5_BR: return "HEVC Hierarchical Lay 5 BitRate";
1007 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L6_BR: return "HEVC Hierarchical Lay 6 BitRate";
1008 case V4L2_CID_MPEG_VIDEO_HEVC_GENERAL_PB: return "HEVC General PB";
1009 case V4L2_CID_MPEG_VIDEO_HEVC_TEMPORAL_ID: return "HEVC Temporal ID";
1010 case V4L2_CID_MPEG_VIDEO_HEVC_STRONG_SMOOTHING: return "HEVC Strong Intra Smoothing";
1011 case V4L2_CID_MPEG_VIDEO_HEVC_INTRA_PU_SPLIT: return "HEVC Intra PU Split";
1012 case V4L2_CID_MPEG_VIDEO_HEVC_TMV_PREDICTION: return "HEVC TMV Prediction";
1013 case V4L2_CID_MPEG_VIDEO_HEVC_MAX_NUM_MERGE_MV_MINUS1: return "HEVC Max Num of Candidate MVs";
1014 case V4L2_CID_MPEG_VIDEO_HEVC_WITHOUT_STARTCODE: return "HEVC ENC Without Startcode";
1015 case V4L2_CID_MPEG_VIDEO_HEVC_REFRESH_PERIOD: return "HEVC Num of I-Frame b/w 2 IDR";
1016 case V4L2_CID_MPEG_VIDEO_HEVC_LF_BETA_OFFSET_DIV2: return "HEVC Loop Filter Beta Offset";
1017 case V4L2_CID_MPEG_VIDEO_HEVC_LF_TC_OFFSET_DIV2: return "HEVC Loop Filter TC Offset";
1018 case V4L2_CID_MPEG_VIDEO_HEVC_SIZE_OF_LENGTH_FIELD: return "HEVC Size of Length Field";
1019 case V4L2_CID_MPEG_VIDEO_REF_NUMBER_FOR_PFRAMES: return "Reference Frames for a P-Frame";
1020 case V4L2_CID_MPEG_VIDEO_PREPEND_SPSPPS_TO_IDR: return "Prepend SPS and PPS to IDR";
1021 case V4L2_CID_MPEG_VIDEO_HEVC_SPS: return "HEVC Sequence Parameter Set";
1022 case V4L2_CID_MPEG_VIDEO_HEVC_PPS: return "HEVC Picture Parameter Set";
1023 case V4L2_CID_MPEG_VIDEO_HEVC_SLICE_PARAMS: return "HEVC Slice Parameters";
1024 case V4L2_CID_MPEG_VIDEO_HEVC_DECODE_MODE: return "HEVC Decode Mode";
1025 case V4L2_CID_MPEG_VIDEO_HEVC_START_CODE: return "HEVC Start Code";
1026
1027 /* CAMERA controls */
1028 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
1029 case V4L2_CID_CAMERA_CLASS: return "Camera Controls";
1030 case V4L2_CID_EXPOSURE_AUTO: return "Auto Exposure";
1031 case V4L2_CID_EXPOSURE_ABSOLUTE: return "Exposure Time, Absolute";
1032 case V4L2_CID_EXPOSURE_AUTO_PRIORITY: return "Exposure, Dynamic Framerate";
1033 case V4L2_CID_PAN_RELATIVE: return "Pan, Relative";
1034 case V4L2_CID_TILT_RELATIVE: return "Tilt, Relative";
1035 case V4L2_CID_PAN_RESET: return "Pan, Reset";
1036 case V4L2_CID_TILT_RESET: return "Tilt, Reset";
1037 case V4L2_CID_PAN_ABSOLUTE: return "Pan, Absolute";
1038 case V4L2_CID_TILT_ABSOLUTE: return "Tilt, Absolute";
1039 case V4L2_CID_FOCUS_ABSOLUTE: return "Focus, Absolute";
1040 case V4L2_CID_FOCUS_RELATIVE: return "Focus, Relative";
1041 case V4L2_CID_FOCUS_AUTO: return "Focus, Automatic Continuous";
1042 case V4L2_CID_ZOOM_ABSOLUTE: return "Zoom, Absolute";
1043 case V4L2_CID_ZOOM_RELATIVE: return "Zoom, Relative";
1044 case V4L2_CID_ZOOM_CONTINUOUS: return "Zoom, Continuous";
1045 case V4L2_CID_PRIVACY: return "Privacy";
1046 case V4L2_CID_IRIS_ABSOLUTE: return "Iris, Absolute";
1047 case V4L2_CID_IRIS_RELATIVE: return "Iris, Relative";
1048 case V4L2_CID_AUTO_EXPOSURE_BIAS: return "Auto Exposure, Bias";
1049 case V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE: return "White Balance, Auto & Preset";
1050 case V4L2_CID_WIDE_DYNAMIC_RANGE: return "Wide Dynamic Range";
1051 case V4L2_CID_IMAGE_STABILIZATION: return "Image Stabilization";
1052 case V4L2_CID_ISO_SENSITIVITY: return "ISO Sensitivity";
1053 case V4L2_CID_ISO_SENSITIVITY_AUTO: return "ISO Sensitivity, Auto";
1054 case V4L2_CID_EXPOSURE_METERING: return "Exposure, Metering Mode";
1055 case V4L2_CID_SCENE_MODE: return "Scene Mode";
1056 case V4L2_CID_3A_LOCK: return "3A Lock";
1057 case V4L2_CID_AUTO_FOCUS_START: return "Auto Focus, Start";
1058 case V4L2_CID_AUTO_FOCUS_STOP: return "Auto Focus, Stop";
1059 case V4L2_CID_AUTO_FOCUS_STATUS: return "Auto Focus, Status";
1060 case V4L2_CID_AUTO_FOCUS_RANGE: return "Auto Focus, Range";
1061 case V4L2_CID_PAN_SPEED: return "Pan, Speed";
1062 case V4L2_CID_TILT_SPEED: return "Tilt, Speed";
1063 case V4L2_CID_UNIT_CELL_SIZE: return "Unit Cell Size";
1064 case V4L2_CID_CAMERA_ORIENTATION: return "Camera Orientation";
1065 case V4L2_CID_CAMERA_SENSOR_ROTATION: return "Camera Sensor Rotation";
1066
1067 /* FM Radio Modulator controls */
1068 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
1069 case V4L2_CID_FM_TX_CLASS: return "FM Radio Modulator Controls";
1070 case V4L2_CID_RDS_TX_DEVIATION: return "RDS Signal Deviation";
1071 case V4L2_CID_RDS_TX_PI: return "RDS Program ID";
1072 case V4L2_CID_RDS_TX_PTY: return "RDS Program Type";
1073 case V4L2_CID_RDS_TX_PS_NAME: return "RDS PS Name";
1074 case V4L2_CID_RDS_TX_RADIO_TEXT: return "RDS Radio Text";
1075 case V4L2_CID_RDS_TX_MONO_STEREO: return "RDS Stereo";
1076 case V4L2_CID_RDS_TX_ARTIFICIAL_HEAD: return "RDS Artificial Head";
1077 case V4L2_CID_RDS_TX_COMPRESSED: return "RDS Compressed";
1078 case V4L2_CID_RDS_TX_DYNAMIC_PTY: return "RDS Dynamic PTY";
1079 case V4L2_CID_RDS_TX_TRAFFIC_ANNOUNCEMENT: return "RDS Traffic Announcement";
1080 case V4L2_CID_RDS_TX_TRAFFIC_PROGRAM: return "RDS Traffic Program";
1081 case V4L2_CID_RDS_TX_MUSIC_SPEECH: return "RDS Music";
1082 case V4L2_CID_RDS_TX_ALT_FREQS_ENABLE: return "RDS Enable Alt Frequencies";
1083 case V4L2_CID_RDS_TX_ALT_FREQS: return "RDS Alternate Frequencies";
1084 case V4L2_CID_AUDIO_LIMITER_ENABLED: return "Audio Limiter Feature Enabled";
1085 case V4L2_CID_AUDIO_LIMITER_RELEASE_TIME: return "Audio Limiter Release Time";
1086 case V4L2_CID_AUDIO_LIMITER_DEVIATION: return "Audio Limiter Deviation";
1087 case V4L2_CID_AUDIO_COMPRESSION_ENABLED: return "Audio Compression Enabled";
1088 case V4L2_CID_AUDIO_COMPRESSION_GAIN: return "Audio Compression Gain";
1089 case V4L2_CID_AUDIO_COMPRESSION_THRESHOLD: return "Audio Compression Threshold";
1090 case V4L2_CID_AUDIO_COMPRESSION_ATTACK_TIME: return "Audio Compression Attack Time";
1091 case V4L2_CID_AUDIO_COMPRESSION_RELEASE_TIME: return "Audio Compression Release Time";
1092 case V4L2_CID_PILOT_TONE_ENABLED: return "Pilot Tone Feature Enabled";
1093 case V4L2_CID_PILOT_TONE_DEVIATION: return "Pilot Tone Deviation";
1094 case V4L2_CID_PILOT_TONE_FREQUENCY: return "Pilot Tone Frequency";
1095 case V4L2_CID_TUNE_PREEMPHASIS: return "Pre-Emphasis";
1096 case V4L2_CID_TUNE_POWER_LEVEL: return "Tune Power Level";
1097 case V4L2_CID_TUNE_ANTENNA_CAPACITOR: return "Tune Antenna Capacitor";
1098
1099 /* Flash controls */
1100 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
1101 case V4L2_CID_FLASH_CLASS: return "Flash Controls";
1102 case V4L2_CID_FLASH_LED_MODE: return "LED Mode";
1103 case V4L2_CID_FLASH_STROBE_SOURCE: return "Strobe Source";
1104 case V4L2_CID_FLASH_STROBE: return "Strobe";
1105 case V4L2_CID_FLASH_STROBE_STOP: return "Stop Strobe";
1106 case V4L2_CID_FLASH_STROBE_STATUS: return "Strobe Status";
1107 case V4L2_CID_FLASH_TIMEOUT: return "Strobe Timeout";
1108 case V4L2_CID_FLASH_INTENSITY: return "Intensity, Flash Mode";
1109 case V4L2_CID_FLASH_TORCH_INTENSITY: return "Intensity, Torch Mode";
1110 case V4L2_CID_FLASH_INDICATOR_INTENSITY: return "Intensity, Indicator";
1111 case V4L2_CID_FLASH_FAULT: return "Faults";
1112 case V4L2_CID_FLASH_CHARGE: return "Charge";
1113 case V4L2_CID_FLASH_READY: return "Ready to Strobe";
1114
1115 /* JPEG encoder controls */
1116 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
1117 case V4L2_CID_JPEG_CLASS: return "JPEG Compression Controls";
1118 case V4L2_CID_JPEG_CHROMA_SUBSAMPLING: return "Chroma Subsampling";
1119 case V4L2_CID_JPEG_RESTART_INTERVAL: return "Restart Interval";
1120 case V4L2_CID_JPEG_COMPRESSION_QUALITY: return "Compression Quality";
1121 case V4L2_CID_JPEG_ACTIVE_MARKER: return "Active Markers";
1122
1123 /* Image source controls */
1124 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
1125 case V4L2_CID_IMAGE_SOURCE_CLASS: return "Image Source Controls";
1126 case V4L2_CID_VBLANK: return "Vertical Blanking";
1127 case V4L2_CID_HBLANK: return "Horizontal Blanking";
1128 case V4L2_CID_ANALOGUE_GAIN: return "Analogue Gain";
1129 case V4L2_CID_TEST_PATTERN_RED: return "Red Pixel Value";
1130 case V4L2_CID_TEST_PATTERN_GREENR: return "Green (Red) Pixel Value";
1131 case V4L2_CID_TEST_PATTERN_BLUE: return "Blue Pixel Value";
1132 case V4L2_CID_TEST_PATTERN_GREENB: return "Green (Blue) Pixel Value";
1133
1134 /* Image processing controls */
1135 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
1136 case V4L2_CID_IMAGE_PROC_CLASS: return "Image Processing Controls";
1137 case V4L2_CID_LINK_FREQ: return "Link Frequency";
1138 case V4L2_CID_PIXEL_RATE: return "Pixel Rate";
1139 case V4L2_CID_TEST_PATTERN: return "Test Pattern";
1140 case V4L2_CID_DEINTERLACING_MODE: return "Deinterlacing Mode";
1141 case V4L2_CID_DIGITAL_GAIN: return "Digital Gain";
1142
1143 /* DV controls */
1144 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
1145 case V4L2_CID_DV_CLASS: return "Digital Video Controls";
1146 case V4L2_CID_DV_TX_HOTPLUG: return "Hotplug Present";
1147 case V4L2_CID_DV_TX_RXSENSE: return "RxSense Present";
1148 case V4L2_CID_DV_TX_EDID_PRESENT: return "EDID Present";
1149 case V4L2_CID_DV_TX_MODE: return "Transmit Mode";
1150 case V4L2_CID_DV_TX_RGB_RANGE: return "Tx RGB Quantization Range";
1151 case V4L2_CID_DV_TX_IT_CONTENT_TYPE: return "Tx IT Content Type";
1152 case V4L2_CID_DV_RX_POWER_PRESENT: return "Power Present";
1153 case V4L2_CID_DV_RX_RGB_RANGE: return "Rx RGB Quantization Range";
1154 case V4L2_CID_DV_RX_IT_CONTENT_TYPE: return "Rx IT Content Type";
1155
1156 case V4L2_CID_FM_RX_CLASS: return "FM Radio Receiver Controls";
1157 case V4L2_CID_TUNE_DEEMPHASIS: return "De-Emphasis";
1158 case V4L2_CID_RDS_RECEPTION: return "RDS Reception";
1159 case V4L2_CID_RF_TUNER_CLASS: return "RF Tuner Controls";
1160 case V4L2_CID_RF_TUNER_RF_GAIN: return "RF Gain";
1161 case V4L2_CID_RF_TUNER_LNA_GAIN_AUTO: return "LNA Gain, Auto";
1162 case V4L2_CID_RF_TUNER_LNA_GAIN: return "LNA Gain";
1163 case V4L2_CID_RF_TUNER_MIXER_GAIN_AUTO: return "Mixer Gain, Auto";
1164 case V4L2_CID_RF_TUNER_MIXER_GAIN: return "Mixer Gain";
1165 case V4L2_CID_RF_TUNER_IF_GAIN_AUTO: return "IF Gain, Auto";
1166 case V4L2_CID_RF_TUNER_IF_GAIN: return "IF Gain";
1167 case V4L2_CID_RF_TUNER_BANDWIDTH_AUTO: return "Bandwidth, Auto";
1168 case V4L2_CID_RF_TUNER_BANDWIDTH: return "Bandwidth";
1169 case V4L2_CID_RF_TUNER_PLL_LOCK: return "PLL Lock";
1170 case V4L2_CID_RDS_RX_PTY: return "RDS Program Type";
1171 case V4L2_CID_RDS_RX_PS_NAME: return "RDS PS Name";
1172 case V4L2_CID_RDS_RX_RADIO_TEXT: return "RDS Radio Text";
1173 case V4L2_CID_RDS_RX_TRAFFIC_ANNOUNCEMENT: return "RDS Traffic Announcement";
1174 case V4L2_CID_RDS_RX_TRAFFIC_PROGRAM: return "RDS Traffic Program";
1175 case V4L2_CID_RDS_RX_MUSIC_SPEECH: return "RDS Music";
1176
1177 /* Detection controls */
1178 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
1179 case V4L2_CID_DETECT_CLASS: return "Detection Controls";
1180 case V4L2_CID_DETECT_MD_MODE: return "Motion Detection Mode";
1181 case V4L2_CID_DETECT_MD_GLOBAL_THRESHOLD: return "MD Global Threshold";
1182 case V4L2_CID_DETECT_MD_THRESHOLD_GRID: return "MD Threshold Grid";
1183 case V4L2_CID_DETECT_MD_REGION_GRID: return "MD Region Grid";
1184 default:
1185 return NULL;
1186 }
1187 }
1188 EXPORT_SYMBOL(v4l2_ctrl_get_name);
1189
v4l2_ctrl_fill(u32 id,const char ** name,enum v4l2_ctrl_type * type,s64 * min,s64 * max,u64 * step,s64 * def,u32 * flags)1190 void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type,
1191 s64 *min, s64 *max, u64 *step, s64 *def, u32 *flags)
1192 {
1193 *name = v4l2_ctrl_get_name(id);
1194 *flags = 0;
1195
1196 switch (id) {
1197 case V4L2_CID_AUDIO_MUTE:
1198 case V4L2_CID_AUDIO_LOUDNESS:
1199 case V4L2_CID_AUTO_WHITE_BALANCE:
1200 case V4L2_CID_AUTOGAIN:
1201 case V4L2_CID_HFLIP:
1202 case V4L2_CID_VFLIP:
1203 case V4L2_CID_HUE_AUTO:
1204 case V4L2_CID_CHROMA_AGC:
1205 case V4L2_CID_COLOR_KILLER:
1206 case V4L2_CID_AUTOBRIGHTNESS:
1207 case V4L2_CID_MPEG_AUDIO_MUTE:
1208 case V4L2_CID_MPEG_VIDEO_MUTE:
1209 case V4L2_CID_MPEG_VIDEO_GOP_CLOSURE:
1210 case V4L2_CID_MPEG_VIDEO_PULLDOWN:
1211 case V4L2_CID_EXPOSURE_AUTO_PRIORITY:
1212 case V4L2_CID_FOCUS_AUTO:
1213 case V4L2_CID_PRIVACY:
1214 case V4L2_CID_AUDIO_LIMITER_ENABLED:
1215 case V4L2_CID_AUDIO_COMPRESSION_ENABLED:
1216 case V4L2_CID_PILOT_TONE_ENABLED:
1217 case V4L2_CID_ILLUMINATORS_1:
1218 case V4L2_CID_ILLUMINATORS_2:
1219 case V4L2_CID_FLASH_STROBE_STATUS:
1220 case V4L2_CID_FLASH_CHARGE:
1221 case V4L2_CID_FLASH_READY:
1222 case V4L2_CID_MPEG_VIDEO_DECODER_MPEG4_DEBLOCK_FILTER:
1223 case V4L2_CID_MPEG_VIDEO_DECODER_SLICE_INTERFACE:
1224 case V4L2_CID_MPEG_VIDEO_FRAME_RC_ENABLE:
1225 case V4L2_CID_MPEG_VIDEO_MB_RC_ENABLE:
1226 case V4L2_CID_MPEG_VIDEO_H264_8X8_TRANSFORM:
1227 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_ENABLE:
1228 case V4L2_CID_MPEG_VIDEO_MPEG4_QPEL:
1229 case V4L2_CID_MPEG_VIDEO_REPEAT_SEQ_HEADER:
1230 case V4L2_CID_WIDE_DYNAMIC_RANGE:
1231 case V4L2_CID_IMAGE_STABILIZATION:
1232 case V4L2_CID_RDS_RECEPTION:
1233 case V4L2_CID_RF_TUNER_LNA_GAIN_AUTO:
1234 case V4L2_CID_RF_TUNER_MIXER_GAIN_AUTO:
1235 case V4L2_CID_RF_TUNER_IF_GAIN_AUTO:
1236 case V4L2_CID_RF_TUNER_BANDWIDTH_AUTO:
1237 case V4L2_CID_RF_TUNER_PLL_LOCK:
1238 case V4L2_CID_RDS_TX_MONO_STEREO:
1239 case V4L2_CID_RDS_TX_ARTIFICIAL_HEAD:
1240 case V4L2_CID_RDS_TX_COMPRESSED:
1241 case V4L2_CID_RDS_TX_DYNAMIC_PTY:
1242 case V4L2_CID_RDS_TX_TRAFFIC_ANNOUNCEMENT:
1243 case V4L2_CID_RDS_TX_TRAFFIC_PROGRAM:
1244 case V4L2_CID_RDS_TX_MUSIC_SPEECH:
1245 case V4L2_CID_RDS_TX_ALT_FREQS_ENABLE:
1246 case V4L2_CID_RDS_RX_TRAFFIC_ANNOUNCEMENT:
1247 case V4L2_CID_RDS_RX_TRAFFIC_PROGRAM:
1248 case V4L2_CID_RDS_RX_MUSIC_SPEECH:
1249 *type = V4L2_CTRL_TYPE_BOOLEAN;
1250 *min = 0;
1251 *max = *step = 1;
1252 break;
1253 case V4L2_CID_ROTATE:
1254 *type = V4L2_CTRL_TYPE_INTEGER;
1255 *flags |= V4L2_CTRL_FLAG_MODIFY_LAYOUT;
1256 break;
1257 case V4L2_CID_MPEG_VIDEO_MV_H_SEARCH_RANGE:
1258 case V4L2_CID_MPEG_VIDEO_MV_V_SEARCH_RANGE:
1259 *type = V4L2_CTRL_TYPE_INTEGER;
1260 break;
1261 case V4L2_CID_MPEG_VIDEO_FORCE_KEY_FRAME:
1262 case V4L2_CID_PAN_RESET:
1263 case V4L2_CID_TILT_RESET:
1264 case V4L2_CID_FLASH_STROBE:
1265 case V4L2_CID_FLASH_STROBE_STOP:
1266 case V4L2_CID_AUTO_FOCUS_START:
1267 case V4L2_CID_AUTO_FOCUS_STOP:
1268 case V4L2_CID_DO_WHITE_BALANCE:
1269 *type = V4L2_CTRL_TYPE_BUTTON;
1270 *flags |= V4L2_CTRL_FLAG_WRITE_ONLY |
1271 V4L2_CTRL_FLAG_EXECUTE_ON_WRITE;
1272 *min = *max = *step = *def = 0;
1273 break;
1274 case V4L2_CID_POWER_LINE_FREQUENCY:
1275 case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ:
1276 case V4L2_CID_MPEG_AUDIO_ENCODING:
1277 case V4L2_CID_MPEG_AUDIO_L1_BITRATE:
1278 case V4L2_CID_MPEG_AUDIO_L2_BITRATE:
1279 case V4L2_CID_MPEG_AUDIO_L3_BITRATE:
1280 case V4L2_CID_MPEG_AUDIO_AC3_BITRATE:
1281 case V4L2_CID_MPEG_AUDIO_MODE:
1282 case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION:
1283 case V4L2_CID_MPEG_AUDIO_EMPHASIS:
1284 case V4L2_CID_MPEG_AUDIO_CRC:
1285 case V4L2_CID_MPEG_AUDIO_DEC_PLAYBACK:
1286 case V4L2_CID_MPEG_AUDIO_DEC_MULTILINGUAL_PLAYBACK:
1287 case V4L2_CID_MPEG_VIDEO_ENCODING:
1288 case V4L2_CID_MPEG_VIDEO_ASPECT:
1289 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
1290 case V4L2_CID_MPEG_STREAM_TYPE:
1291 case V4L2_CID_MPEG_STREAM_VBI_FMT:
1292 case V4L2_CID_EXPOSURE_AUTO:
1293 case V4L2_CID_AUTO_FOCUS_RANGE:
1294 case V4L2_CID_COLORFX:
1295 case V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE:
1296 case V4L2_CID_TUNE_PREEMPHASIS:
1297 case V4L2_CID_FLASH_LED_MODE:
1298 case V4L2_CID_FLASH_STROBE_SOURCE:
1299 case V4L2_CID_MPEG_VIDEO_HEADER_MODE:
1300 case V4L2_CID_MPEG_VIDEO_FRAME_SKIP_MODE:
1301 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE:
1302 case V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE:
1303 case V4L2_CID_MPEG_VIDEO_H264_LEVEL:
1304 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE:
1305 case V4L2_CID_MPEG_VIDEO_H264_PROFILE:
1306 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC:
1307 case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE:
1308 case V4L2_CID_MPEG_VIDEO_H264_FMO_MAP_TYPE:
1309 case V4L2_CID_MPEG_VIDEO_H264_DECODE_MODE:
1310 case V4L2_CID_MPEG_VIDEO_H264_START_CODE:
1311 case V4L2_CID_MPEG_VIDEO_MPEG2_LEVEL:
1312 case V4L2_CID_MPEG_VIDEO_MPEG2_PROFILE:
1313 case V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL:
1314 case V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE:
1315 case V4L2_CID_JPEG_CHROMA_SUBSAMPLING:
1316 case V4L2_CID_ISO_SENSITIVITY_AUTO:
1317 case V4L2_CID_EXPOSURE_METERING:
1318 case V4L2_CID_SCENE_MODE:
1319 case V4L2_CID_DV_TX_MODE:
1320 case V4L2_CID_DV_TX_RGB_RANGE:
1321 case V4L2_CID_DV_TX_IT_CONTENT_TYPE:
1322 case V4L2_CID_DV_RX_RGB_RANGE:
1323 case V4L2_CID_DV_RX_IT_CONTENT_TYPE:
1324 case V4L2_CID_TEST_PATTERN:
1325 case V4L2_CID_DEINTERLACING_MODE:
1326 case V4L2_CID_TUNE_DEEMPHASIS:
1327 case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_SEL:
1328 case V4L2_CID_MPEG_VIDEO_VP8_PROFILE:
1329 case V4L2_CID_MPEG_VIDEO_VP9_PROFILE:
1330 case V4L2_CID_MPEG_VIDEO_VP9_LEVEL:
1331 case V4L2_CID_DETECT_MD_MODE:
1332 case V4L2_CID_MPEG_VIDEO_HEVC_PROFILE:
1333 case V4L2_CID_MPEG_VIDEO_HEVC_LEVEL:
1334 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_TYPE:
1335 case V4L2_CID_MPEG_VIDEO_HEVC_REFRESH_TYPE:
1336 case V4L2_CID_MPEG_VIDEO_HEVC_SIZE_OF_LENGTH_FIELD:
1337 case V4L2_CID_MPEG_VIDEO_HEVC_TIER:
1338 case V4L2_CID_MPEG_VIDEO_HEVC_LOOP_FILTER_MODE:
1339 case V4L2_CID_MPEG_VIDEO_HEVC_DECODE_MODE:
1340 case V4L2_CID_MPEG_VIDEO_HEVC_START_CODE:
1341 case V4L2_CID_CAMERA_ORIENTATION:
1342 *type = V4L2_CTRL_TYPE_MENU;
1343 break;
1344 case V4L2_CID_LINK_FREQ:
1345 *type = V4L2_CTRL_TYPE_INTEGER_MENU;
1346 break;
1347 case V4L2_CID_RDS_TX_PS_NAME:
1348 case V4L2_CID_RDS_TX_RADIO_TEXT:
1349 case V4L2_CID_RDS_RX_PS_NAME:
1350 case V4L2_CID_RDS_RX_RADIO_TEXT:
1351 *type = V4L2_CTRL_TYPE_STRING;
1352 break;
1353 case V4L2_CID_ISO_SENSITIVITY:
1354 case V4L2_CID_AUTO_EXPOSURE_BIAS:
1355 case V4L2_CID_MPEG_VIDEO_VPX_NUM_PARTITIONS:
1356 case V4L2_CID_MPEG_VIDEO_VPX_NUM_REF_FRAMES:
1357 *type = V4L2_CTRL_TYPE_INTEGER_MENU;
1358 break;
1359 case V4L2_CID_USER_CLASS:
1360 case V4L2_CID_CAMERA_CLASS:
1361 case V4L2_CID_MPEG_CLASS:
1362 case V4L2_CID_FM_TX_CLASS:
1363 case V4L2_CID_FLASH_CLASS:
1364 case V4L2_CID_JPEG_CLASS:
1365 case V4L2_CID_IMAGE_SOURCE_CLASS:
1366 case V4L2_CID_IMAGE_PROC_CLASS:
1367 case V4L2_CID_DV_CLASS:
1368 case V4L2_CID_FM_RX_CLASS:
1369 case V4L2_CID_RF_TUNER_CLASS:
1370 case V4L2_CID_DETECT_CLASS:
1371 *type = V4L2_CTRL_TYPE_CTRL_CLASS;
1372 /* You can neither read not write these */
1373 *flags |= V4L2_CTRL_FLAG_READ_ONLY | V4L2_CTRL_FLAG_WRITE_ONLY;
1374 *min = *max = *step = *def = 0;
1375 break;
1376 case V4L2_CID_BG_COLOR:
1377 *type = V4L2_CTRL_TYPE_INTEGER;
1378 *step = 1;
1379 *min = 0;
1380 /* Max is calculated as RGB888 that is 2^24 */
1381 *max = 0xFFFFFF;
1382 break;
1383 case V4L2_CID_FLASH_FAULT:
1384 case V4L2_CID_JPEG_ACTIVE_MARKER:
1385 case V4L2_CID_3A_LOCK:
1386 case V4L2_CID_AUTO_FOCUS_STATUS:
1387 case V4L2_CID_DV_TX_HOTPLUG:
1388 case V4L2_CID_DV_TX_RXSENSE:
1389 case V4L2_CID_DV_TX_EDID_PRESENT:
1390 case V4L2_CID_DV_RX_POWER_PRESENT:
1391 *type = V4L2_CTRL_TYPE_BITMASK;
1392 break;
1393 case V4L2_CID_MIN_BUFFERS_FOR_CAPTURE:
1394 case V4L2_CID_MIN_BUFFERS_FOR_OUTPUT:
1395 *type = V4L2_CTRL_TYPE_INTEGER;
1396 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
1397 break;
1398 case V4L2_CID_MPEG_VIDEO_DEC_PTS:
1399 *type = V4L2_CTRL_TYPE_INTEGER64;
1400 *flags |= V4L2_CTRL_FLAG_VOLATILE | V4L2_CTRL_FLAG_READ_ONLY;
1401 *min = *def = 0;
1402 *max = 0x1ffffffffLL;
1403 *step = 1;
1404 break;
1405 case V4L2_CID_MPEG_VIDEO_DEC_FRAME:
1406 *type = V4L2_CTRL_TYPE_INTEGER64;
1407 *flags |= V4L2_CTRL_FLAG_VOLATILE | V4L2_CTRL_FLAG_READ_ONLY;
1408 *min = *def = 0;
1409 *max = 0x7fffffffffffffffLL;
1410 *step = 1;
1411 break;
1412 case V4L2_CID_PIXEL_RATE:
1413 *type = V4L2_CTRL_TYPE_INTEGER64;
1414 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
1415 break;
1416 case V4L2_CID_DETECT_MD_REGION_GRID:
1417 *type = V4L2_CTRL_TYPE_U8;
1418 break;
1419 case V4L2_CID_DETECT_MD_THRESHOLD_GRID:
1420 *type = V4L2_CTRL_TYPE_U16;
1421 break;
1422 case V4L2_CID_RDS_TX_ALT_FREQS:
1423 *type = V4L2_CTRL_TYPE_U32;
1424 break;
1425 case V4L2_CID_MPEG_VIDEO_MPEG2_SLICE_PARAMS:
1426 *type = V4L2_CTRL_TYPE_MPEG2_SLICE_PARAMS;
1427 break;
1428 case V4L2_CID_MPEG_VIDEO_MPEG2_QUANTIZATION:
1429 *type = V4L2_CTRL_TYPE_MPEG2_QUANTIZATION;
1430 break;
1431 case V4L2_CID_MPEG_VIDEO_FWHT_PARAMS:
1432 *type = V4L2_CTRL_TYPE_FWHT_PARAMS;
1433 break;
1434 case V4L2_CID_MPEG_VIDEO_H264_SPS:
1435 *type = V4L2_CTRL_TYPE_H264_SPS;
1436 break;
1437 case V4L2_CID_MPEG_VIDEO_H264_PPS:
1438 *type = V4L2_CTRL_TYPE_H264_PPS;
1439 break;
1440 case V4L2_CID_MPEG_VIDEO_H264_SCALING_MATRIX:
1441 *type = V4L2_CTRL_TYPE_H264_SCALING_MATRIX;
1442 break;
1443 case V4L2_CID_MPEG_VIDEO_H264_SLICE_PARAMS:
1444 *type = V4L2_CTRL_TYPE_H264_SLICE_PARAMS;
1445 break;
1446 case V4L2_CID_MPEG_VIDEO_H264_DECODE_PARAMS:
1447 *type = V4L2_CTRL_TYPE_H264_DECODE_PARAMS;
1448 break;
1449 case V4L2_CID_MPEG_VIDEO_H264_PRED_WEIGHTS:
1450 *type = V4L2_CTRL_TYPE_H264_PRED_WEIGHTS;
1451 break;
1452 case V4L2_CID_MPEG_VIDEO_VP8_FRAME_HEADER:
1453 *type = V4L2_CTRL_TYPE_VP8_FRAME_HEADER;
1454 break;
1455 case V4L2_CID_MPEG_VIDEO_HEVC_SPS:
1456 *type = V4L2_CTRL_TYPE_HEVC_SPS;
1457 break;
1458 case V4L2_CID_MPEG_VIDEO_HEVC_PPS:
1459 *type = V4L2_CTRL_TYPE_HEVC_PPS;
1460 break;
1461 case V4L2_CID_MPEG_VIDEO_HEVC_SLICE_PARAMS:
1462 *type = V4L2_CTRL_TYPE_HEVC_SLICE_PARAMS;
1463 break;
1464 case V4L2_CID_UNIT_CELL_SIZE:
1465 *type = V4L2_CTRL_TYPE_AREA;
1466 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
1467 break;
1468 default:
1469 *type = V4L2_CTRL_TYPE_INTEGER;
1470 break;
1471 }
1472 switch (id) {
1473 case V4L2_CID_MPEG_AUDIO_ENCODING:
1474 case V4L2_CID_MPEG_AUDIO_MODE:
1475 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
1476 case V4L2_CID_MPEG_VIDEO_B_FRAMES:
1477 case V4L2_CID_MPEG_STREAM_TYPE:
1478 *flags |= V4L2_CTRL_FLAG_UPDATE;
1479 break;
1480 case V4L2_CID_AUDIO_VOLUME:
1481 case V4L2_CID_AUDIO_BALANCE:
1482 case V4L2_CID_AUDIO_BASS:
1483 case V4L2_CID_AUDIO_TREBLE:
1484 case V4L2_CID_BRIGHTNESS:
1485 case V4L2_CID_CONTRAST:
1486 case V4L2_CID_SATURATION:
1487 case V4L2_CID_HUE:
1488 case V4L2_CID_RED_BALANCE:
1489 case V4L2_CID_BLUE_BALANCE:
1490 case V4L2_CID_GAMMA:
1491 case V4L2_CID_SHARPNESS:
1492 case V4L2_CID_CHROMA_GAIN:
1493 case V4L2_CID_RDS_TX_DEVIATION:
1494 case V4L2_CID_AUDIO_LIMITER_RELEASE_TIME:
1495 case V4L2_CID_AUDIO_LIMITER_DEVIATION:
1496 case V4L2_CID_AUDIO_COMPRESSION_GAIN:
1497 case V4L2_CID_AUDIO_COMPRESSION_THRESHOLD:
1498 case V4L2_CID_AUDIO_COMPRESSION_ATTACK_TIME:
1499 case V4L2_CID_AUDIO_COMPRESSION_RELEASE_TIME:
1500 case V4L2_CID_PILOT_TONE_DEVIATION:
1501 case V4L2_CID_PILOT_TONE_FREQUENCY:
1502 case V4L2_CID_TUNE_POWER_LEVEL:
1503 case V4L2_CID_TUNE_ANTENNA_CAPACITOR:
1504 case V4L2_CID_RF_TUNER_RF_GAIN:
1505 case V4L2_CID_RF_TUNER_LNA_GAIN:
1506 case V4L2_CID_RF_TUNER_MIXER_GAIN:
1507 case V4L2_CID_RF_TUNER_IF_GAIN:
1508 case V4L2_CID_RF_TUNER_BANDWIDTH:
1509 case V4L2_CID_DETECT_MD_GLOBAL_THRESHOLD:
1510 *flags |= V4L2_CTRL_FLAG_SLIDER;
1511 break;
1512 case V4L2_CID_PAN_RELATIVE:
1513 case V4L2_CID_TILT_RELATIVE:
1514 case V4L2_CID_FOCUS_RELATIVE:
1515 case V4L2_CID_IRIS_RELATIVE:
1516 case V4L2_CID_ZOOM_RELATIVE:
1517 *flags |= V4L2_CTRL_FLAG_WRITE_ONLY |
1518 V4L2_CTRL_FLAG_EXECUTE_ON_WRITE;
1519 break;
1520 case V4L2_CID_FLASH_STROBE_STATUS:
1521 case V4L2_CID_AUTO_FOCUS_STATUS:
1522 case V4L2_CID_FLASH_READY:
1523 case V4L2_CID_DV_TX_HOTPLUG:
1524 case V4L2_CID_DV_TX_RXSENSE:
1525 case V4L2_CID_DV_TX_EDID_PRESENT:
1526 case V4L2_CID_DV_RX_POWER_PRESENT:
1527 case V4L2_CID_DV_RX_IT_CONTENT_TYPE:
1528 case V4L2_CID_RDS_RX_PTY:
1529 case V4L2_CID_RDS_RX_PS_NAME:
1530 case V4L2_CID_RDS_RX_RADIO_TEXT:
1531 case V4L2_CID_RDS_RX_TRAFFIC_ANNOUNCEMENT:
1532 case V4L2_CID_RDS_RX_TRAFFIC_PROGRAM:
1533 case V4L2_CID_RDS_RX_MUSIC_SPEECH:
1534 case V4L2_CID_CAMERA_ORIENTATION:
1535 case V4L2_CID_CAMERA_SENSOR_ROTATION:
1536 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
1537 break;
1538 case V4L2_CID_RF_TUNER_PLL_LOCK:
1539 *flags |= V4L2_CTRL_FLAG_VOLATILE;
1540 break;
1541 }
1542 }
1543 EXPORT_SYMBOL(v4l2_ctrl_fill);
1544
user_flags(const struct v4l2_ctrl * ctrl)1545 static u32 user_flags(const struct v4l2_ctrl *ctrl)
1546 {
1547 u32 flags = ctrl->flags;
1548
1549 if (ctrl->is_ptr)
1550 flags |= V4L2_CTRL_FLAG_HAS_PAYLOAD;
1551
1552 return flags;
1553 }
1554
fill_event(struct v4l2_event * ev,struct v4l2_ctrl * ctrl,u32 changes)1555 static void fill_event(struct v4l2_event *ev, struct v4l2_ctrl *ctrl, u32 changes)
1556 {
1557 memset(ev, 0, sizeof(*ev));
1558 ev->type = V4L2_EVENT_CTRL;
1559 ev->id = ctrl->id;
1560 ev->u.ctrl.changes = changes;
1561 ev->u.ctrl.type = ctrl->type;
1562 ev->u.ctrl.flags = user_flags(ctrl);
1563 if (ctrl->is_ptr)
1564 ev->u.ctrl.value64 = 0;
1565 else
1566 ev->u.ctrl.value64 = *ctrl->p_cur.p_s64;
1567 ev->u.ctrl.minimum = ctrl->minimum;
1568 ev->u.ctrl.maximum = ctrl->maximum;
1569 if (ctrl->type == V4L2_CTRL_TYPE_MENU
1570 || ctrl->type == V4L2_CTRL_TYPE_INTEGER_MENU)
1571 ev->u.ctrl.step = 1;
1572 else
1573 ev->u.ctrl.step = ctrl->step;
1574 ev->u.ctrl.default_value = ctrl->default_value;
1575 }
1576
send_event(struct v4l2_fh * fh,struct v4l2_ctrl * ctrl,u32 changes)1577 static void send_event(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, u32 changes)
1578 {
1579 struct v4l2_event ev;
1580 struct v4l2_subscribed_event *sev;
1581
1582 if (list_empty(&ctrl->ev_subs))
1583 return;
1584 fill_event(&ev, ctrl, changes);
1585
1586 list_for_each_entry(sev, &ctrl->ev_subs, node)
1587 if (sev->fh != fh ||
1588 (sev->flags & V4L2_EVENT_SUB_FL_ALLOW_FEEDBACK))
1589 v4l2_event_queue_fh(sev->fh, &ev);
1590 }
1591
std_equal(const struct v4l2_ctrl * ctrl,u32 idx,union v4l2_ctrl_ptr ptr1,union v4l2_ctrl_ptr ptr2)1592 static bool std_equal(const struct v4l2_ctrl *ctrl, u32 idx,
1593 union v4l2_ctrl_ptr ptr1,
1594 union v4l2_ctrl_ptr ptr2)
1595 {
1596 switch (ctrl->type) {
1597 case V4L2_CTRL_TYPE_BUTTON:
1598 return false;
1599 case V4L2_CTRL_TYPE_STRING:
1600 idx *= ctrl->elem_size;
1601 /* strings are always 0-terminated */
1602 return !strcmp(ptr1.p_char + idx, ptr2.p_char + idx);
1603 case V4L2_CTRL_TYPE_INTEGER64:
1604 return ptr1.p_s64[idx] == ptr2.p_s64[idx];
1605 case V4L2_CTRL_TYPE_U8:
1606 return ptr1.p_u8[idx] == ptr2.p_u8[idx];
1607 case V4L2_CTRL_TYPE_U16:
1608 return ptr1.p_u16[idx] == ptr2.p_u16[idx];
1609 case V4L2_CTRL_TYPE_U32:
1610 return ptr1.p_u32[idx] == ptr2.p_u32[idx];
1611 default:
1612 if (ctrl->is_int)
1613 return ptr1.p_s32[idx] == ptr2.p_s32[idx];
1614 idx *= ctrl->elem_size;
1615 return !memcmp(ptr1.p_const + idx, ptr2.p_const + idx,
1616 ctrl->elem_size);
1617 }
1618 }
1619
std_init_compound(const struct v4l2_ctrl * ctrl,u32 idx,union v4l2_ctrl_ptr ptr)1620 static void std_init_compound(const struct v4l2_ctrl *ctrl, u32 idx,
1621 union v4l2_ctrl_ptr ptr)
1622 {
1623 struct v4l2_ctrl_mpeg2_slice_params *p_mpeg2_slice_params;
1624 void *p = ptr.p + idx * ctrl->elem_size;
1625
1626 if (ctrl->p_def.p_const)
1627 memcpy(p, ctrl->p_def.p_const, ctrl->elem_size);
1628 else
1629 memset(p, 0, ctrl->elem_size);
1630
1631 /*
1632 * The cast is needed to get rid of a gcc warning complaining that
1633 * V4L2_CTRL_TYPE_MPEG2_SLICE_PARAMS is not part of the
1634 * v4l2_ctrl_type enum.
1635 */
1636 switch ((u32)ctrl->type) {
1637 case V4L2_CTRL_TYPE_MPEG2_SLICE_PARAMS:
1638 p_mpeg2_slice_params = p;
1639 /* 4:2:0 */
1640 p_mpeg2_slice_params->sequence.chroma_format = 1;
1641 /* interlaced top field */
1642 p_mpeg2_slice_params->picture.picture_structure = 1;
1643 p_mpeg2_slice_params->picture.picture_coding_type =
1644 V4L2_MPEG2_PICTURE_CODING_TYPE_I;
1645 break;
1646 }
1647 }
1648
std_init(const struct v4l2_ctrl * ctrl,u32 idx,union v4l2_ctrl_ptr ptr)1649 static void std_init(const struct v4l2_ctrl *ctrl, u32 idx,
1650 union v4l2_ctrl_ptr ptr)
1651 {
1652 switch (ctrl->type) {
1653 case V4L2_CTRL_TYPE_STRING:
1654 idx *= ctrl->elem_size;
1655 memset(ptr.p_char + idx, ' ', ctrl->minimum);
1656 ptr.p_char[idx + ctrl->minimum] = '\0';
1657 break;
1658 case V4L2_CTRL_TYPE_INTEGER64:
1659 ptr.p_s64[idx] = ctrl->default_value;
1660 break;
1661 case V4L2_CTRL_TYPE_INTEGER:
1662 case V4L2_CTRL_TYPE_INTEGER_MENU:
1663 case V4L2_CTRL_TYPE_MENU:
1664 case V4L2_CTRL_TYPE_BITMASK:
1665 case V4L2_CTRL_TYPE_BOOLEAN:
1666 ptr.p_s32[idx] = ctrl->default_value;
1667 break;
1668 case V4L2_CTRL_TYPE_BUTTON:
1669 case V4L2_CTRL_TYPE_CTRL_CLASS:
1670 ptr.p_s32[idx] = 0;
1671 break;
1672 case V4L2_CTRL_TYPE_U8:
1673 ptr.p_u8[idx] = ctrl->default_value;
1674 break;
1675 case V4L2_CTRL_TYPE_U16:
1676 ptr.p_u16[idx] = ctrl->default_value;
1677 break;
1678 case V4L2_CTRL_TYPE_U32:
1679 ptr.p_u32[idx] = ctrl->default_value;
1680 break;
1681 default:
1682 std_init_compound(ctrl, idx, ptr);
1683 break;
1684 }
1685 }
1686
std_log(const struct v4l2_ctrl * ctrl)1687 static void std_log(const struct v4l2_ctrl *ctrl)
1688 {
1689 union v4l2_ctrl_ptr ptr = ctrl->p_cur;
1690
1691 if (ctrl->is_array) {
1692 unsigned i;
1693
1694 for (i = 0; i < ctrl->nr_of_dims; i++)
1695 pr_cont("[%u]", ctrl->dims[i]);
1696 pr_cont(" ");
1697 }
1698
1699 switch (ctrl->type) {
1700 case V4L2_CTRL_TYPE_INTEGER:
1701 pr_cont("%d", *ptr.p_s32);
1702 break;
1703 case V4L2_CTRL_TYPE_BOOLEAN:
1704 pr_cont("%s", *ptr.p_s32 ? "true" : "false");
1705 break;
1706 case V4L2_CTRL_TYPE_MENU:
1707 pr_cont("%s", ctrl->qmenu[*ptr.p_s32]);
1708 break;
1709 case V4L2_CTRL_TYPE_INTEGER_MENU:
1710 pr_cont("%lld", ctrl->qmenu_int[*ptr.p_s32]);
1711 break;
1712 case V4L2_CTRL_TYPE_BITMASK:
1713 pr_cont("0x%08x", *ptr.p_s32);
1714 break;
1715 case V4L2_CTRL_TYPE_INTEGER64:
1716 pr_cont("%lld", *ptr.p_s64);
1717 break;
1718 case V4L2_CTRL_TYPE_STRING:
1719 pr_cont("%s", ptr.p_char);
1720 break;
1721 case V4L2_CTRL_TYPE_U8:
1722 pr_cont("%u", (unsigned)*ptr.p_u8);
1723 break;
1724 case V4L2_CTRL_TYPE_U16:
1725 pr_cont("%u", (unsigned)*ptr.p_u16);
1726 break;
1727 case V4L2_CTRL_TYPE_U32:
1728 pr_cont("%u", (unsigned)*ptr.p_u32);
1729 break;
1730 default:
1731 pr_cont("unknown type %d", ctrl->type);
1732 break;
1733 }
1734 }
1735
1736 /*
1737 * Round towards the closest legal value. Be careful when we are
1738 * close to the maximum range of the control type to prevent
1739 * wrap-arounds.
1740 */
1741 #define ROUND_TO_RANGE(val, offset_type, ctrl) \
1742 ({ \
1743 offset_type offset; \
1744 if ((ctrl)->maximum >= 0 && \
1745 val >= (ctrl)->maximum - (s32)((ctrl)->step / 2)) \
1746 val = (ctrl)->maximum; \
1747 else \
1748 val += (s32)((ctrl)->step / 2); \
1749 val = clamp_t(typeof(val), val, \
1750 (ctrl)->minimum, (ctrl)->maximum); \
1751 offset = (val) - (ctrl)->minimum; \
1752 offset = (ctrl)->step * (offset / (u32)(ctrl)->step); \
1753 val = (ctrl)->minimum + offset; \
1754 0; \
1755 })
1756
1757 /* Validate a new control */
1758
1759 #define zero_padding(s) \
1760 memset(&(s).padding, 0, sizeof((s).padding))
1761 #define zero_reserved(s) \
1762 memset(&(s).reserved, 0, sizeof((s).reserved))
1763
1764 /*
1765 * Compound controls validation requires setting unused fields/flags to zero
1766 * in order to properly detect unchanged controls with std_equal's memcmp.
1767 */
std_validate_compound(const struct v4l2_ctrl * ctrl,u32 idx,union v4l2_ctrl_ptr ptr)1768 static int std_validate_compound(const struct v4l2_ctrl *ctrl, u32 idx,
1769 union v4l2_ctrl_ptr ptr)
1770 {
1771 struct v4l2_ctrl_mpeg2_slice_params *p_mpeg2_slice_params;
1772 struct v4l2_ctrl_vp8_frame_header *p_vp8_frame_header;
1773 struct v4l2_ctrl_h264_slice_params *p_h264_slice_params;
1774 struct v4l2_ctrl_h264_decode_params *p_h264_dec_params;
1775 struct v4l2_ctrl_hevc_sps *p_hevc_sps;
1776 struct v4l2_ctrl_hevc_pps *p_hevc_pps;
1777 struct v4l2_ctrl_hevc_slice_params *p_hevc_slice_params;
1778 struct v4l2_area *area;
1779 void *p = ptr.p + idx * ctrl->elem_size;
1780 unsigned int i;
1781
1782 switch ((u32)ctrl->type) {
1783 case V4L2_CTRL_TYPE_MPEG2_SLICE_PARAMS:
1784 p_mpeg2_slice_params = p;
1785
1786 switch (p_mpeg2_slice_params->sequence.chroma_format) {
1787 case 1: /* 4:2:0 */
1788 case 2: /* 4:2:2 */
1789 case 3: /* 4:4:4 */
1790 break;
1791 default:
1792 return -EINVAL;
1793 }
1794
1795 switch (p_mpeg2_slice_params->picture.intra_dc_precision) {
1796 case 0: /* 8 bits */
1797 case 1: /* 9 bits */
1798 case 2: /* 10 bits */
1799 case 3: /* 11 bits */
1800 break;
1801 default:
1802 return -EINVAL;
1803 }
1804
1805 switch (p_mpeg2_slice_params->picture.picture_structure) {
1806 case 1: /* interlaced top field */
1807 case 2: /* interlaced bottom field */
1808 case 3: /* progressive */
1809 break;
1810 default:
1811 return -EINVAL;
1812 }
1813
1814 switch (p_mpeg2_slice_params->picture.picture_coding_type) {
1815 case V4L2_MPEG2_PICTURE_CODING_TYPE_I:
1816 case V4L2_MPEG2_PICTURE_CODING_TYPE_P:
1817 case V4L2_MPEG2_PICTURE_CODING_TYPE_B:
1818 break;
1819 default:
1820 return -EINVAL;
1821 }
1822
1823 break;
1824
1825 case V4L2_CTRL_TYPE_MPEG2_QUANTIZATION:
1826 break;
1827
1828 case V4L2_CTRL_TYPE_FWHT_PARAMS:
1829 break;
1830
1831 case V4L2_CTRL_TYPE_H264_SPS:
1832 case V4L2_CTRL_TYPE_H264_PPS:
1833 case V4L2_CTRL_TYPE_H264_SCALING_MATRIX:
1834 case V4L2_CTRL_TYPE_H264_PRED_WEIGHTS:
1835 break;
1836
1837 case V4L2_CTRL_TYPE_H264_SLICE_PARAMS:
1838 p_h264_slice_params = p;
1839
1840 zero_reserved(*p_h264_slice_params);
1841 break;
1842
1843 case V4L2_CTRL_TYPE_H264_DECODE_PARAMS:
1844 p_h264_dec_params = p;
1845
1846 for (i = 0; i < V4L2_H264_NUM_DPB_ENTRIES; i++) {
1847 struct v4l2_h264_dpb_entry *dpb_entry =
1848 &p_h264_dec_params->dpb[i];
1849
1850 zero_reserved(*dpb_entry);
1851 }
1852 zero_reserved(*p_h264_dec_params);
1853 break;
1854
1855 case V4L2_CTRL_TYPE_VP8_FRAME_HEADER:
1856 p_vp8_frame_header = p;
1857
1858 switch (p_vp8_frame_header->num_dct_parts) {
1859 case 1:
1860 case 2:
1861 case 4:
1862 case 8:
1863 break;
1864 default:
1865 return -EINVAL;
1866 }
1867 zero_padding(p_vp8_frame_header->segment_header);
1868 zero_padding(p_vp8_frame_header->lf_header);
1869 zero_padding(p_vp8_frame_header->quant_header);
1870 zero_padding(p_vp8_frame_header->entropy_header);
1871 zero_padding(p_vp8_frame_header->coder_state);
1872 break;
1873
1874 case V4L2_CTRL_TYPE_HEVC_SPS:
1875 p_hevc_sps = p;
1876
1877 if (!(p_hevc_sps->flags & V4L2_HEVC_SPS_FLAG_PCM_ENABLED)) {
1878 p_hevc_sps->pcm_sample_bit_depth_luma_minus1 = 0;
1879 p_hevc_sps->pcm_sample_bit_depth_chroma_minus1 = 0;
1880 p_hevc_sps->log2_min_pcm_luma_coding_block_size_minus3 = 0;
1881 p_hevc_sps->log2_diff_max_min_pcm_luma_coding_block_size = 0;
1882 }
1883
1884 if (!(p_hevc_sps->flags &
1885 V4L2_HEVC_SPS_FLAG_LONG_TERM_REF_PICS_PRESENT))
1886 p_hevc_sps->num_long_term_ref_pics_sps = 0;
1887 break;
1888
1889 case V4L2_CTRL_TYPE_HEVC_PPS:
1890 p_hevc_pps = p;
1891
1892 if (!(p_hevc_pps->flags &
1893 V4L2_HEVC_PPS_FLAG_CU_QP_DELTA_ENABLED))
1894 p_hevc_pps->diff_cu_qp_delta_depth = 0;
1895
1896 if (!(p_hevc_pps->flags & V4L2_HEVC_PPS_FLAG_TILES_ENABLED)) {
1897 p_hevc_pps->num_tile_columns_minus1 = 0;
1898 p_hevc_pps->num_tile_rows_minus1 = 0;
1899 memset(&p_hevc_pps->column_width_minus1, 0,
1900 sizeof(p_hevc_pps->column_width_minus1));
1901 memset(&p_hevc_pps->row_height_minus1, 0,
1902 sizeof(p_hevc_pps->row_height_minus1));
1903
1904 p_hevc_pps->flags &=
1905 ~V4L2_HEVC_PPS_FLAG_LOOP_FILTER_ACROSS_TILES_ENABLED;
1906 }
1907
1908 if (p_hevc_pps->flags &
1909 V4L2_HEVC_PPS_FLAG_PPS_DISABLE_DEBLOCKING_FILTER) {
1910 p_hevc_pps->pps_beta_offset_div2 = 0;
1911 p_hevc_pps->pps_tc_offset_div2 = 0;
1912 }
1913
1914 zero_padding(*p_hevc_pps);
1915 break;
1916
1917 case V4L2_CTRL_TYPE_HEVC_SLICE_PARAMS:
1918 p_hevc_slice_params = p;
1919
1920 if (p_hevc_slice_params->num_active_dpb_entries >
1921 V4L2_HEVC_DPB_ENTRIES_NUM_MAX)
1922 return -EINVAL;
1923
1924 zero_padding(p_hevc_slice_params->pred_weight_table);
1925
1926 for (i = 0; i < p_hevc_slice_params->num_active_dpb_entries;
1927 i++) {
1928 struct v4l2_hevc_dpb_entry *dpb_entry =
1929 &p_hevc_slice_params->dpb[i];
1930
1931 zero_padding(*dpb_entry);
1932 }
1933
1934 zero_padding(*p_hevc_slice_params);
1935 break;
1936
1937 case V4L2_CTRL_TYPE_AREA:
1938 area = p;
1939 if (!area->width || !area->height)
1940 return -EINVAL;
1941 break;
1942
1943 default:
1944 return -EINVAL;
1945 }
1946
1947 return 0;
1948 }
1949
std_validate(const struct v4l2_ctrl * ctrl,u32 idx,union v4l2_ctrl_ptr ptr)1950 static int std_validate(const struct v4l2_ctrl *ctrl, u32 idx,
1951 union v4l2_ctrl_ptr ptr)
1952 {
1953 size_t len;
1954 u64 offset;
1955 s64 val;
1956
1957 switch ((u32)ctrl->type) {
1958 case V4L2_CTRL_TYPE_INTEGER:
1959 return ROUND_TO_RANGE(ptr.p_s32[idx], u32, ctrl);
1960 case V4L2_CTRL_TYPE_INTEGER64:
1961 /*
1962 * We can't use the ROUND_TO_RANGE define here due to
1963 * the u64 divide that needs special care.
1964 */
1965 val = ptr.p_s64[idx];
1966 if (ctrl->maximum >= 0 && val >= ctrl->maximum - (s64)(ctrl->step / 2))
1967 val = ctrl->maximum;
1968 else
1969 val += (s64)(ctrl->step / 2);
1970 val = clamp_t(s64, val, ctrl->minimum, ctrl->maximum);
1971 offset = val - ctrl->minimum;
1972 do_div(offset, ctrl->step);
1973 ptr.p_s64[idx] = ctrl->minimum + offset * ctrl->step;
1974 return 0;
1975 case V4L2_CTRL_TYPE_U8:
1976 return ROUND_TO_RANGE(ptr.p_u8[idx], u8, ctrl);
1977 case V4L2_CTRL_TYPE_U16:
1978 return ROUND_TO_RANGE(ptr.p_u16[idx], u16, ctrl);
1979 case V4L2_CTRL_TYPE_U32:
1980 return ROUND_TO_RANGE(ptr.p_u32[idx], u32, ctrl);
1981
1982 case V4L2_CTRL_TYPE_BOOLEAN:
1983 ptr.p_s32[idx] = !!ptr.p_s32[idx];
1984 return 0;
1985
1986 case V4L2_CTRL_TYPE_MENU:
1987 case V4L2_CTRL_TYPE_INTEGER_MENU:
1988 if (ptr.p_s32[idx] < ctrl->minimum || ptr.p_s32[idx] > ctrl->maximum)
1989 return -ERANGE;
1990 if (ctrl->menu_skip_mask & (1ULL << ptr.p_s32[idx]))
1991 return -EINVAL;
1992 if (ctrl->type == V4L2_CTRL_TYPE_MENU &&
1993 ctrl->qmenu[ptr.p_s32[idx]][0] == '\0')
1994 return -EINVAL;
1995 return 0;
1996
1997 case V4L2_CTRL_TYPE_BITMASK:
1998 ptr.p_s32[idx] &= ctrl->maximum;
1999 return 0;
2000
2001 case V4L2_CTRL_TYPE_BUTTON:
2002 case V4L2_CTRL_TYPE_CTRL_CLASS:
2003 ptr.p_s32[idx] = 0;
2004 return 0;
2005
2006 case V4L2_CTRL_TYPE_STRING:
2007 idx *= ctrl->elem_size;
2008 len = strlen(ptr.p_char + idx);
2009 if (len < ctrl->minimum)
2010 return -ERANGE;
2011 if ((len - (u32)ctrl->minimum) % (u32)ctrl->step)
2012 return -ERANGE;
2013 return 0;
2014
2015 default:
2016 return std_validate_compound(ctrl, idx, ptr);
2017 }
2018 }
2019
2020 static const struct v4l2_ctrl_type_ops std_type_ops = {
2021 .equal = std_equal,
2022 .init = std_init,
2023 .log = std_log,
2024 .validate = std_validate,
2025 };
2026
2027 /* Helper function: copy the given control value back to the caller */
ptr_to_user(struct v4l2_ext_control * c,struct v4l2_ctrl * ctrl,union v4l2_ctrl_ptr ptr)2028 static int ptr_to_user(struct v4l2_ext_control *c,
2029 struct v4l2_ctrl *ctrl,
2030 union v4l2_ctrl_ptr ptr)
2031 {
2032 u32 len;
2033
2034 if (ctrl->is_ptr && !ctrl->is_string)
2035 return copy_to_user(c->ptr, ptr.p_const, c->size) ?
2036 -EFAULT : 0;
2037
2038 switch (ctrl->type) {
2039 case V4L2_CTRL_TYPE_STRING:
2040 len = strlen(ptr.p_char);
2041 if (c->size < len + 1) {
2042 c->size = ctrl->elem_size;
2043 return -ENOSPC;
2044 }
2045 return copy_to_user(c->string, ptr.p_char, len + 1) ?
2046 -EFAULT : 0;
2047 case V4L2_CTRL_TYPE_INTEGER64:
2048 c->value64 = *ptr.p_s64;
2049 break;
2050 default:
2051 c->value = *ptr.p_s32;
2052 break;
2053 }
2054 return 0;
2055 }
2056
2057 /* Helper function: copy the current control value back to the caller */
cur_to_user(struct v4l2_ext_control * c,struct v4l2_ctrl * ctrl)2058 static int cur_to_user(struct v4l2_ext_control *c,
2059 struct v4l2_ctrl *ctrl)
2060 {
2061 return ptr_to_user(c, ctrl, ctrl->p_cur);
2062 }
2063
2064 /* Helper function: copy the new control value back to the caller */
new_to_user(struct v4l2_ext_control * c,struct v4l2_ctrl * ctrl)2065 static int new_to_user(struct v4l2_ext_control *c,
2066 struct v4l2_ctrl *ctrl)
2067 {
2068 return ptr_to_user(c, ctrl, ctrl->p_new);
2069 }
2070
2071 /* Helper function: copy the request value back to the caller */
req_to_user(struct v4l2_ext_control * c,struct v4l2_ctrl_ref * ref)2072 static int req_to_user(struct v4l2_ext_control *c,
2073 struct v4l2_ctrl_ref *ref)
2074 {
2075 return ptr_to_user(c, ref->ctrl, ref->p_req);
2076 }
2077
2078 /* Helper function: copy the initial control value back to the caller */
def_to_user(struct v4l2_ext_control * c,struct v4l2_ctrl * ctrl)2079 static int def_to_user(struct v4l2_ext_control *c, struct v4l2_ctrl *ctrl)
2080 {
2081 int idx;
2082
2083 for (idx = 0; idx < ctrl->elems; idx++)
2084 ctrl->type_ops->init(ctrl, idx, ctrl->p_new);
2085
2086 return ptr_to_user(c, ctrl, ctrl->p_new);
2087 }
2088
2089 /* Helper function: copy the caller-provider value to the given control value */
user_to_ptr(struct v4l2_ext_control * c,struct v4l2_ctrl * ctrl,union v4l2_ctrl_ptr ptr)2090 static int user_to_ptr(struct v4l2_ext_control *c,
2091 struct v4l2_ctrl *ctrl,
2092 union v4l2_ctrl_ptr ptr)
2093 {
2094 int ret;
2095 u32 size;
2096
2097 ctrl->is_new = 1;
2098 if (ctrl->is_ptr && !ctrl->is_string) {
2099 unsigned idx;
2100
2101 ret = copy_from_user(ptr.p, c->ptr, c->size) ? -EFAULT : 0;
2102 if (ret || !ctrl->is_array)
2103 return ret;
2104 for (idx = c->size / ctrl->elem_size; idx < ctrl->elems; idx++)
2105 ctrl->type_ops->init(ctrl, idx, ptr);
2106 return 0;
2107 }
2108
2109 switch (ctrl->type) {
2110 case V4L2_CTRL_TYPE_INTEGER64:
2111 *ptr.p_s64 = c->value64;
2112 break;
2113 case V4L2_CTRL_TYPE_STRING:
2114 size = c->size;
2115 if (size == 0)
2116 return -ERANGE;
2117 if (size > ctrl->maximum + 1)
2118 size = ctrl->maximum + 1;
2119 ret = copy_from_user(ptr.p_char, c->string, size) ? -EFAULT : 0;
2120 if (!ret) {
2121 char last = ptr.p_char[size - 1];
2122
2123 ptr.p_char[size - 1] = 0;
2124 /* If the string was longer than ctrl->maximum,
2125 then return an error. */
2126 if (strlen(ptr.p_char) == ctrl->maximum && last)
2127 return -ERANGE;
2128 }
2129 return ret;
2130 default:
2131 *ptr.p_s32 = c->value;
2132 break;
2133 }
2134 return 0;
2135 }
2136
2137 /* Helper function: copy the caller-provider value as the new control value */
user_to_new(struct v4l2_ext_control * c,struct v4l2_ctrl * ctrl)2138 static int user_to_new(struct v4l2_ext_control *c,
2139 struct v4l2_ctrl *ctrl)
2140 {
2141 return user_to_ptr(c, ctrl, ctrl->p_new);
2142 }
2143
2144 /* Copy the one value to another. */
ptr_to_ptr(struct v4l2_ctrl * ctrl,union v4l2_ctrl_ptr from,union v4l2_ctrl_ptr to)2145 static void ptr_to_ptr(struct v4l2_ctrl *ctrl,
2146 union v4l2_ctrl_ptr from, union v4l2_ctrl_ptr to)
2147 {
2148 if (ctrl == NULL)
2149 return;
2150 memcpy(to.p, from.p_const, ctrl->elems * ctrl->elem_size);
2151 }
2152
2153 /* Copy the new value to the current value. */
new_to_cur(struct v4l2_fh * fh,struct v4l2_ctrl * ctrl,u32 ch_flags)2154 static void new_to_cur(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, u32 ch_flags)
2155 {
2156 bool changed;
2157
2158 if (ctrl == NULL)
2159 return;
2160
2161 /* has_changed is set by cluster_changed */
2162 changed = ctrl->has_changed;
2163 if (changed)
2164 ptr_to_ptr(ctrl, ctrl->p_new, ctrl->p_cur);
2165
2166 if (ch_flags & V4L2_EVENT_CTRL_CH_FLAGS) {
2167 /* Note: CH_FLAGS is only set for auto clusters. */
2168 ctrl->flags &=
2169 ~(V4L2_CTRL_FLAG_INACTIVE | V4L2_CTRL_FLAG_VOLATILE);
2170 if (!is_cur_manual(ctrl->cluster[0])) {
2171 ctrl->flags |= V4L2_CTRL_FLAG_INACTIVE;
2172 if (ctrl->cluster[0]->has_volatiles)
2173 ctrl->flags |= V4L2_CTRL_FLAG_VOLATILE;
2174 }
2175 fh = NULL;
2176 }
2177 if (changed || ch_flags) {
2178 /* If a control was changed that was not one of the controls
2179 modified by the application, then send the event to all. */
2180 if (!ctrl->is_new)
2181 fh = NULL;
2182 send_event(fh, ctrl,
2183 (changed ? V4L2_EVENT_CTRL_CH_VALUE : 0) | ch_flags);
2184 if (ctrl->call_notify && changed && ctrl->handler->notify)
2185 ctrl->handler->notify(ctrl, ctrl->handler->notify_priv);
2186 }
2187 }
2188
2189 /* Copy the current value to the new value */
cur_to_new(struct v4l2_ctrl * ctrl)2190 static void cur_to_new(struct v4l2_ctrl *ctrl)
2191 {
2192 if (ctrl == NULL)
2193 return;
2194 ptr_to_ptr(ctrl, ctrl->p_cur, ctrl->p_new);
2195 }
2196
2197 /* Copy the new value to the request value */
new_to_req(struct v4l2_ctrl_ref * ref)2198 static void new_to_req(struct v4l2_ctrl_ref *ref)
2199 {
2200 if (!ref)
2201 return;
2202 ptr_to_ptr(ref->ctrl, ref->ctrl->p_new, ref->p_req);
2203 ref->req = ref;
2204 }
2205
2206 /* Copy the request value to the new value */
req_to_new(struct v4l2_ctrl_ref * ref)2207 static void req_to_new(struct v4l2_ctrl_ref *ref)
2208 {
2209 if (!ref)
2210 return;
2211 if (ref->req)
2212 ptr_to_ptr(ref->ctrl, ref->req->p_req, ref->ctrl->p_new);
2213 else
2214 ptr_to_ptr(ref->ctrl, ref->ctrl->p_cur, ref->ctrl->p_new);
2215 }
2216
2217 /* Return non-zero if one or more of the controls in the cluster has a new
2218 value that differs from the current value. */
cluster_changed(struct v4l2_ctrl * master)2219 static int cluster_changed(struct v4l2_ctrl *master)
2220 {
2221 bool changed = false;
2222 unsigned idx;
2223 int i;
2224
2225 for (i = 0; i < master->ncontrols; i++) {
2226 struct v4l2_ctrl *ctrl = master->cluster[i];
2227 bool ctrl_changed = false;
2228
2229 if (ctrl == NULL)
2230 continue;
2231
2232 if (ctrl->flags & V4L2_CTRL_FLAG_EXECUTE_ON_WRITE)
2233 changed = ctrl_changed = true;
2234
2235 /*
2236 * Set has_changed to false to avoid generating
2237 * the event V4L2_EVENT_CTRL_CH_VALUE
2238 */
2239 if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE) {
2240 ctrl->has_changed = false;
2241 continue;
2242 }
2243
2244 for (idx = 0; !ctrl_changed && idx < ctrl->elems; idx++)
2245 ctrl_changed = !ctrl->type_ops->equal(ctrl, idx,
2246 ctrl->p_cur, ctrl->p_new);
2247 ctrl->has_changed = ctrl_changed;
2248 changed |= ctrl->has_changed;
2249 }
2250 return changed;
2251 }
2252
2253 /* Control range checking */
check_range(enum v4l2_ctrl_type type,s64 min,s64 max,u64 step,s64 def)2254 static int check_range(enum v4l2_ctrl_type type,
2255 s64 min, s64 max, u64 step, s64 def)
2256 {
2257 switch (type) {
2258 case V4L2_CTRL_TYPE_BOOLEAN:
2259 if (step != 1 || max > 1 || min < 0)
2260 return -ERANGE;
2261 fallthrough;
2262 case V4L2_CTRL_TYPE_U8:
2263 case V4L2_CTRL_TYPE_U16:
2264 case V4L2_CTRL_TYPE_U32:
2265 case V4L2_CTRL_TYPE_INTEGER:
2266 case V4L2_CTRL_TYPE_INTEGER64:
2267 if (step == 0 || min > max || def < min || def > max)
2268 return -ERANGE;
2269 return 0;
2270 case V4L2_CTRL_TYPE_BITMASK:
2271 if (step || min || !max || (def & ~max))
2272 return -ERANGE;
2273 return 0;
2274 case V4L2_CTRL_TYPE_MENU:
2275 case V4L2_CTRL_TYPE_INTEGER_MENU:
2276 if (min > max || def < min || def > max)
2277 return -ERANGE;
2278 /* Note: step == menu_skip_mask for menu controls.
2279 So here we check if the default value is masked out. */
2280 if (step && ((1 << def) & step))
2281 return -EINVAL;
2282 return 0;
2283 case V4L2_CTRL_TYPE_STRING:
2284 if (min > max || min < 0 || step < 1 || def)
2285 return -ERANGE;
2286 return 0;
2287 default:
2288 return 0;
2289 }
2290 }
2291
2292 /* Validate a new control */
validate_new(const struct v4l2_ctrl * ctrl,union v4l2_ctrl_ptr p_new)2293 static int validate_new(const struct v4l2_ctrl *ctrl, union v4l2_ctrl_ptr p_new)
2294 {
2295 unsigned idx;
2296 int err = 0;
2297
2298 for (idx = 0; !err && idx < ctrl->elems; idx++)
2299 err = ctrl->type_ops->validate(ctrl, idx, p_new);
2300 return err;
2301 }
2302
node2id(struct list_head * node)2303 static inline u32 node2id(struct list_head *node)
2304 {
2305 return list_entry(node, struct v4l2_ctrl_ref, node)->ctrl->id;
2306 }
2307
2308 /* Set the handler's error code if it wasn't set earlier already */
handler_set_err(struct v4l2_ctrl_handler * hdl,int err)2309 static inline int handler_set_err(struct v4l2_ctrl_handler *hdl, int err)
2310 {
2311 if (hdl->error == 0)
2312 hdl->error = err;
2313 return err;
2314 }
2315
2316 /* Initialize the handler */
v4l2_ctrl_handler_init_class(struct v4l2_ctrl_handler * hdl,unsigned nr_of_controls_hint,struct lock_class_key * key,const char * name)2317 int v4l2_ctrl_handler_init_class(struct v4l2_ctrl_handler *hdl,
2318 unsigned nr_of_controls_hint,
2319 struct lock_class_key *key, const char *name)
2320 {
2321 mutex_init(&hdl->_lock);
2322 hdl->lock = &hdl->_lock;
2323 lockdep_set_class_and_name(hdl->lock, key, name);
2324 INIT_LIST_HEAD(&hdl->ctrls);
2325 INIT_LIST_HEAD(&hdl->ctrl_refs);
2326 INIT_LIST_HEAD(&hdl->requests);
2327 INIT_LIST_HEAD(&hdl->requests_queued);
2328 hdl->request_is_queued = false;
2329 hdl->nr_of_buckets = 1 + nr_of_controls_hint / 8;
2330 hdl->buckets = kvmalloc_array(hdl->nr_of_buckets,
2331 sizeof(hdl->buckets[0]),
2332 GFP_KERNEL | __GFP_ZERO);
2333 hdl->error = hdl->buckets ? 0 : -ENOMEM;
2334 media_request_object_init(&hdl->req_obj);
2335 return hdl->error;
2336 }
2337 EXPORT_SYMBOL(v4l2_ctrl_handler_init_class);
2338
2339 /* Free all controls and control refs */
v4l2_ctrl_handler_free(struct v4l2_ctrl_handler * hdl)2340 void v4l2_ctrl_handler_free(struct v4l2_ctrl_handler *hdl)
2341 {
2342 struct v4l2_ctrl_ref *ref, *next_ref;
2343 struct v4l2_ctrl *ctrl, *next_ctrl;
2344 struct v4l2_subscribed_event *sev, *next_sev;
2345
2346 if (hdl == NULL || hdl->buckets == NULL)
2347 return;
2348
2349 if (!hdl->req_obj.req && !list_empty(&hdl->requests)) {
2350 struct v4l2_ctrl_handler *req, *next_req;
2351
2352 list_for_each_entry_safe(req, next_req, &hdl->requests, requests) {
2353 media_request_object_unbind(&req->req_obj);
2354 media_request_object_put(&req->req_obj);
2355 }
2356 }
2357 mutex_lock(hdl->lock);
2358 /* Free all nodes */
2359 list_for_each_entry_safe(ref, next_ref, &hdl->ctrl_refs, node) {
2360 list_del(&ref->node);
2361 kfree(ref);
2362 }
2363 /* Free all controls owned by the handler */
2364 list_for_each_entry_safe(ctrl, next_ctrl, &hdl->ctrls, node) {
2365 list_del(&ctrl->node);
2366 list_for_each_entry_safe(sev, next_sev, &ctrl->ev_subs, node)
2367 list_del(&sev->node);
2368 kvfree(ctrl);
2369 }
2370 kvfree(hdl->buckets);
2371 hdl->buckets = NULL;
2372 hdl->cached = NULL;
2373 hdl->error = 0;
2374 mutex_unlock(hdl->lock);
2375 mutex_destroy(&hdl->_lock);
2376 }
2377 EXPORT_SYMBOL(v4l2_ctrl_handler_free);
2378
2379 /* For backwards compatibility: V4L2_CID_PRIVATE_BASE should no longer
2380 be used except in G_CTRL, S_CTRL, QUERYCTRL and QUERYMENU when dealing
2381 with applications that do not use the NEXT_CTRL flag.
2382
2383 We just find the n-th private user control. It's O(N), but that should not
2384 be an issue in this particular case. */
find_private_ref(struct v4l2_ctrl_handler * hdl,u32 id)2385 static struct v4l2_ctrl_ref *find_private_ref(
2386 struct v4l2_ctrl_handler *hdl, u32 id)
2387 {
2388 struct v4l2_ctrl_ref *ref;
2389
2390 id -= V4L2_CID_PRIVATE_BASE;
2391 list_for_each_entry(ref, &hdl->ctrl_refs, node) {
2392 /* Search for private user controls that are compatible with
2393 VIDIOC_G/S_CTRL. */
2394 if (V4L2_CTRL_ID2WHICH(ref->ctrl->id) == V4L2_CTRL_CLASS_USER &&
2395 V4L2_CTRL_DRIVER_PRIV(ref->ctrl->id)) {
2396 if (!ref->ctrl->is_int)
2397 continue;
2398 if (id == 0)
2399 return ref;
2400 id--;
2401 }
2402 }
2403 return NULL;
2404 }
2405
2406 /* Find a control with the given ID. */
find_ref(struct v4l2_ctrl_handler * hdl,u32 id)2407 static struct v4l2_ctrl_ref *find_ref(struct v4l2_ctrl_handler *hdl, u32 id)
2408 {
2409 struct v4l2_ctrl_ref *ref;
2410 int bucket;
2411
2412 id &= V4L2_CTRL_ID_MASK;
2413
2414 /* Old-style private controls need special handling */
2415 if (id >= V4L2_CID_PRIVATE_BASE)
2416 return find_private_ref(hdl, id);
2417 bucket = id % hdl->nr_of_buckets;
2418
2419 /* Simple optimization: cache the last control found */
2420 if (hdl->cached && hdl->cached->ctrl->id == id)
2421 return hdl->cached;
2422
2423 /* Not in cache, search the hash */
2424 ref = hdl->buckets ? hdl->buckets[bucket] : NULL;
2425 while (ref && ref->ctrl->id != id)
2426 ref = ref->next;
2427
2428 if (ref)
2429 hdl->cached = ref; /* cache it! */
2430 return ref;
2431 }
2432
2433 /* Find a control with the given ID. Take the handler's lock first. */
find_ref_lock(struct v4l2_ctrl_handler * hdl,u32 id)2434 static struct v4l2_ctrl_ref *find_ref_lock(
2435 struct v4l2_ctrl_handler *hdl, u32 id)
2436 {
2437 struct v4l2_ctrl_ref *ref = NULL;
2438
2439 if (hdl) {
2440 mutex_lock(hdl->lock);
2441 ref = find_ref(hdl, id);
2442 mutex_unlock(hdl->lock);
2443 }
2444 return ref;
2445 }
2446
2447 /* Find a control with the given ID. */
v4l2_ctrl_find(struct v4l2_ctrl_handler * hdl,u32 id)2448 struct v4l2_ctrl *v4l2_ctrl_find(struct v4l2_ctrl_handler *hdl, u32 id)
2449 {
2450 struct v4l2_ctrl_ref *ref = find_ref_lock(hdl, id);
2451
2452 return ref ? ref->ctrl : NULL;
2453 }
2454 EXPORT_SYMBOL(v4l2_ctrl_find);
2455
2456 /* Allocate a new v4l2_ctrl_ref and hook it into the handler. */
handler_new_ref(struct v4l2_ctrl_handler * hdl,struct v4l2_ctrl * ctrl,struct v4l2_ctrl_ref ** ctrl_ref,bool from_other_dev,bool allocate_req)2457 static int handler_new_ref(struct v4l2_ctrl_handler *hdl,
2458 struct v4l2_ctrl *ctrl,
2459 struct v4l2_ctrl_ref **ctrl_ref,
2460 bool from_other_dev, bool allocate_req)
2461 {
2462 struct v4l2_ctrl_ref *ref;
2463 struct v4l2_ctrl_ref *new_ref;
2464 u32 id = ctrl->id;
2465 u32 class_ctrl = V4L2_CTRL_ID2WHICH(id) | 1;
2466 int bucket = id % hdl->nr_of_buckets; /* which bucket to use */
2467 unsigned int size_extra_req = 0;
2468
2469 if (ctrl_ref)
2470 *ctrl_ref = NULL;
2471
2472 /*
2473 * Automatically add the control class if it is not yet present and
2474 * the new control is not a compound control.
2475 */
2476 if (ctrl->type < V4L2_CTRL_COMPOUND_TYPES &&
2477 id != class_ctrl && find_ref_lock(hdl, class_ctrl) == NULL)
2478 if (!v4l2_ctrl_new_std(hdl, NULL, class_ctrl, 0, 0, 0, 0))
2479 return hdl->error;
2480
2481 if (hdl->error)
2482 return hdl->error;
2483
2484 if (allocate_req)
2485 size_extra_req = ctrl->elems * ctrl->elem_size;
2486 new_ref = kzalloc(sizeof(*new_ref) + size_extra_req, GFP_KERNEL);
2487 if (!new_ref)
2488 return handler_set_err(hdl, -ENOMEM);
2489 new_ref->ctrl = ctrl;
2490 new_ref->from_other_dev = from_other_dev;
2491 if (size_extra_req)
2492 new_ref->p_req.p = &new_ref[1];
2493
2494 INIT_LIST_HEAD(&new_ref->node);
2495
2496 mutex_lock(hdl->lock);
2497
2498 /* Add immediately at the end of the list if the list is empty, or if
2499 the last element in the list has a lower ID.
2500 This ensures that when elements are added in ascending order the
2501 insertion is an O(1) operation. */
2502 if (list_empty(&hdl->ctrl_refs) || id > node2id(hdl->ctrl_refs.prev)) {
2503 list_add_tail(&new_ref->node, &hdl->ctrl_refs);
2504 goto insert_in_hash;
2505 }
2506
2507 /* Find insert position in sorted list */
2508 list_for_each_entry(ref, &hdl->ctrl_refs, node) {
2509 if (ref->ctrl->id < id)
2510 continue;
2511 /* Don't add duplicates */
2512 if (ref->ctrl->id == id) {
2513 kfree(new_ref);
2514 goto unlock;
2515 }
2516 list_add(&new_ref->node, ref->node.prev);
2517 break;
2518 }
2519
2520 insert_in_hash:
2521 /* Insert the control node in the hash */
2522 new_ref->next = hdl->buckets[bucket];
2523 hdl->buckets[bucket] = new_ref;
2524 if (ctrl_ref)
2525 *ctrl_ref = new_ref;
2526 if (ctrl->handler == hdl) {
2527 /* By default each control starts in a cluster of its own.
2528 * new_ref->ctrl is basically a cluster array with one
2529 * element, so that's perfect to use as the cluster pointer.
2530 * But only do this for the handler that owns the control.
2531 */
2532 ctrl->cluster = &new_ref->ctrl;
2533 ctrl->ncontrols = 1;
2534 }
2535
2536 unlock:
2537 mutex_unlock(hdl->lock);
2538 return 0;
2539 }
2540
2541 /* Add a new control */
v4l2_ctrl_new(struct v4l2_ctrl_handler * hdl,const struct v4l2_ctrl_ops * ops,const struct v4l2_ctrl_type_ops * type_ops,u32 id,const char * name,enum v4l2_ctrl_type type,s64 min,s64 max,u64 step,s64 def,const u32 dims[V4L2_CTRL_MAX_DIMS],u32 elem_size,u32 flags,const char * const * qmenu,const s64 * qmenu_int,const union v4l2_ctrl_ptr p_def,void * priv)2542 static struct v4l2_ctrl *v4l2_ctrl_new(struct v4l2_ctrl_handler *hdl,
2543 const struct v4l2_ctrl_ops *ops,
2544 const struct v4l2_ctrl_type_ops *type_ops,
2545 u32 id, const char *name, enum v4l2_ctrl_type type,
2546 s64 min, s64 max, u64 step, s64 def,
2547 const u32 dims[V4L2_CTRL_MAX_DIMS], u32 elem_size,
2548 u32 flags, const char * const *qmenu,
2549 const s64 *qmenu_int, const union v4l2_ctrl_ptr p_def,
2550 void *priv)
2551 {
2552 struct v4l2_ctrl *ctrl;
2553 unsigned sz_extra;
2554 unsigned nr_of_dims = 0;
2555 unsigned elems = 1;
2556 bool is_array;
2557 unsigned tot_ctrl_size;
2558 unsigned idx;
2559 void *data;
2560 int err;
2561
2562 if (hdl->error)
2563 return NULL;
2564
2565 while (dims && dims[nr_of_dims]) {
2566 elems *= dims[nr_of_dims];
2567 nr_of_dims++;
2568 if (nr_of_dims == V4L2_CTRL_MAX_DIMS)
2569 break;
2570 }
2571 is_array = nr_of_dims > 0;
2572
2573 /* Prefill elem_size for all types handled by std_type_ops */
2574 switch ((u32)type) {
2575 case V4L2_CTRL_TYPE_INTEGER64:
2576 elem_size = sizeof(s64);
2577 break;
2578 case V4L2_CTRL_TYPE_STRING:
2579 elem_size = max + 1;
2580 break;
2581 case V4L2_CTRL_TYPE_U8:
2582 elem_size = sizeof(u8);
2583 break;
2584 case V4L2_CTRL_TYPE_U16:
2585 elem_size = sizeof(u16);
2586 break;
2587 case V4L2_CTRL_TYPE_U32:
2588 elem_size = sizeof(u32);
2589 break;
2590 case V4L2_CTRL_TYPE_MPEG2_SLICE_PARAMS:
2591 elem_size = sizeof(struct v4l2_ctrl_mpeg2_slice_params);
2592 break;
2593 case V4L2_CTRL_TYPE_MPEG2_QUANTIZATION:
2594 elem_size = sizeof(struct v4l2_ctrl_mpeg2_quantization);
2595 break;
2596 case V4L2_CTRL_TYPE_FWHT_PARAMS:
2597 elem_size = sizeof(struct v4l2_ctrl_fwht_params);
2598 break;
2599 case V4L2_CTRL_TYPE_H264_SPS:
2600 elem_size = sizeof(struct v4l2_ctrl_h264_sps);
2601 break;
2602 case V4L2_CTRL_TYPE_H264_PPS:
2603 elem_size = sizeof(struct v4l2_ctrl_h264_pps);
2604 break;
2605 case V4L2_CTRL_TYPE_H264_SCALING_MATRIX:
2606 elem_size = sizeof(struct v4l2_ctrl_h264_scaling_matrix);
2607 break;
2608 case V4L2_CTRL_TYPE_H264_SLICE_PARAMS:
2609 elem_size = sizeof(struct v4l2_ctrl_h264_slice_params);
2610 break;
2611 case V4L2_CTRL_TYPE_H264_DECODE_PARAMS:
2612 elem_size = sizeof(struct v4l2_ctrl_h264_decode_params);
2613 break;
2614 case V4L2_CTRL_TYPE_H264_PRED_WEIGHTS:
2615 elem_size = sizeof(struct v4l2_ctrl_h264_pred_weights);
2616 break;
2617 case V4L2_CTRL_TYPE_VP8_FRAME_HEADER:
2618 elem_size = sizeof(struct v4l2_ctrl_vp8_frame_header);
2619 break;
2620 case V4L2_CTRL_TYPE_HEVC_SPS:
2621 elem_size = sizeof(struct v4l2_ctrl_hevc_sps);
2622 break;
2623 case V4L2_CTRL_TYPE_HEVC_PPS:
2624 elem_size = sizeof(struct v4l2_ctrl_hevc_pps);
2625 break;
2626 case V4L2_CTRL_TYPE_HEVC_SLICE_PARAMS:
2627 elem_size = sizeof(struct v4l2_ctrl_hevc_slice_params);
2628 break;
2629 case V4L2_CTRL_TYPE_AREA:
2630 elem_size = sizeof(struct v4l2_area);
2631 break;
2632 default:
2633 if (type < V4L2_CTRL_COMPOUND_TYPES)
2634 elem_size = sizeof(s32);
2635 break;
2636 }
2637 tot_ctrl_size = elem_size * elems;
2638
2639 /* Sanity checks */
2640 if (id == 0 || name == NULL || !elem_size ||
2641 id >= V4L2_CID_PRIVATE_BASE ||
2642 (type == V4L2_CTRL_TYPE_MENU && qmenu == NULL) ||
2643 (type == V4L2_CTRL_TYPE_INTEGER_MENU && qmenu_int == NULL)) {
2644 handler_set_err(hdl, -ERANGE);
2645 return NULL;
2646 }
2647 err = check_range(type, min, max, step, def);
2648 if (err) {
2649 handler_set_err(hdl, err);
2650 return NULL;
2651 }
2652 if (is_array &&
2653 (type == V4L2_CTRL_TYPE_BUTTON ||
2654 type == V4L2_CTRL_TYPE_CTRL_CLASS)) {
2655 handler_set_err(hdl, -EINVAL);
2656 return NULL;
2657 }
2658
2659 sz_extra = 0;
2660 if (type == V4L2_CTRL_TYPE_BUTTON)
2661 flags |= V4L2_CTRL_FLAG_WRITE_ONLY |
2662 V4L2_CTRL_FLAG_EXECUTE_ON_WRITE;
2663 else if (type == V4L2_CTRL_TYPE_CTRL_CLASS)
2664 flags |= V4L2_CTRL_FLAG_READ_ONLY;
2665 else if (type == V4L2_CTRL_TYPE_INTEGER64 ||
2666 type == V4L2_CTRL_TYPE_STRING ||
2667 type >= V4L2_CTRL_COMPOUND_TYPES ||
2668 is_array)
2669 sz_extra += 2 * tot_ctrl_size;
2670
2671 if (type >= V4L2_CTRL_COMPOUND_TYPES && p_def.p_const)
2672 sz_extra += elem_size;
2673
2674 ctrl = kvzalloc(sizeof(*ctrl) + sz_extra, GFP_KERNEL);
2675 if (ctrl == NULL) {
2676 handler_set_err(hdl, -ENOMEM);
2677 return NULL;
2678 }
2679
2680 INIT_LIST_HEAD(&ctrl->node);
2681 INIT_LIST_HEAD(&ctrl->ev_subs);
2682 ctrl->handler = hdl;
2683 ctrl->ops = ops;
2684 ctrl->type_ops = type_ops ? type_ops : &std_type_ops;
2685 ctrl->id = id;
2686 ctrl->name = name;
2687 ctrl->type = type;
2688 ctrl->flags = flags;
2689 ctrl->minimum = min;
2690 ctrl->maximum = max;
2691 ctrl->step = step;
2692 ctrl->default_value = def;
2693 ctrl->is_string = !is_array && type == V4L2_CTRL_TYPE_STRING;
2694 ctrl->is_ptr = is_array || type >= V4L2_CTRL_COMPOUND_TYPES || ctrl->is_string;
2695 ctrl->is_int = !ctrl->is_ptr && type != V4L2_CTRL_TYPE_INTEGER64;
2696 ctrl->is_array = is_array;
2697 ctrl->elems = elems;
2698 ctrl->nr_of_dims = nr_of_dims;
2699 if (nr_of_dims)
2700 memcpy(ctrl->dims, dims, nr_of_dims * sizeof(dims[0]));
2701 ctrl->elem_size = elem_size;
2702 if (type == V4L2_CTRL_TYPE_MENU)
2703 ctrl->qmenu = qmenu;
2704 else if (type == V4L2_CTRL_TYPE_INTEGER_MENU)
2705 ctrl->qmenu_int = qmenu_int;
2706 ctrl->priv = priv;
2707 ctrl->cur.val = ctrl->val = def;
2708 data = &ctrl[1];
2709
2710 if (!ctrl->is_int) {
2711 ctrl->p_new.p = data;
2712 ctrl->p_cur.p = data + tot_ctrl_size;
2713 } else {
2714 ctrl->p_new.p = &ctrl->val;
2715 ctrl->p_cur.p = &ctrl->cur.val;
2716 }
2717
2718 if (type >= V4L2_CTRL_COMPOUND_TYPES && p_def.p_const) {
2719 ctrl->p_def.p = ctrl->p_cur.p + tot_ctrl_size;
2720 memcpy(ctrl->p_def.p, p_def.p_const, elem_size);
2721 }
2722
2723 for (idx = 0; idx < elems; idx++) {
2724 ctrl->type_ops->init(ctrl, idx, ctrl->p_cur);
2725 ctrl->type_ops->init(ctrl, idx, ctrl->p_new);
2726 }
2727
2728 if (handler_new_ref(hdl, ctrl, NULL, false, false)) {
2729 kvfree(ctrl);
2730 return NULL;
2731 }
2732 mutex_lock(hdl->lock);
2733 list_add_tail(&ctrl->node, &hdl->ctrls);
2734 mutex_unlock(hdl->lock);
2735 return ctrl;
2736 }
2737
v4l2_ctrl_new_custom(struct v4l2_ctrl_handler * hdl,const struct v4l2_ctrl_config * cfg,void * priv)2738 struct v4l2_ctrl *v4l2_ctrl_new_custom(struct v4l2_ctrl_handler *hdl,
2739 const struct v4l2_ctrl_config *cfg, void *priv)
2740 {
2741 bool is_menu;
2742 struct v4l2_ctrl *ctrl;
2743 const char *name = cfg->name;
2744 const char * const *qmenu = cfg->qmenu;
2745 const s64 *qmenu_int = cfg->qmenu_int;
2746 enum v4l2_ctrl_type type = cfg->type;
2747 u32 flags = cfg->flags;
2748 s64 min = cfg->min;
2749 s64 max = cfg->max;
2750 u64 step = cfg->step;
2751 s64 def = cfg->def;
2752
2753 if (name == NULL)
2754 v4l2_ctrl_fill(cfg->id, &name, &type, &min, &max, &step,
2755 &def, &flags);
2756
2757 is_menu = (type == V4L2_CTRL_TYPE_MENU ||
2758 type == V4L2_CTRL_TYPE_INTEGER_MENU);
2759 if (is_menu)
2760 WARN_ON(step);
2761 else
2762 WARN_ON(cfg->menu_skip_mask);
2763 if (type == V4L2_CTRL_TYPE_MENU && !qmenu) {
2764 qmenu = v4l2_ctrl_get_menu(cfg->id);
2765 } else if (type == V4L2_CTRL_TYPE_INTEGER_MENU && !qmenu_int) {
2766 handler_set_err(hdl, -EINVAL);
2767 return NULL;
2768 }
2769
2770 ctrl = v4l2_ctrl_new(hdl, cfg->ops, cfg->type_ops, cfg->id, name,
2771 type, min, max,
2772 is_menu ? cfg->menu_skip_mask : step, def,
2773 cfg->dims, cfg->elem_size,
2774 flags, qmenu, qmenu_int, cfg->p_def, priv);
2775 if (ctrl)
2776 ctrl->is_private = cfg->is_private;
2777 return ctrl;
2778 }
2779 EXPORT_SYMBOL(v4l2_ctrl_new_custom);
2780
2781 /* Helper function for standard non-menu controls */
v4l2_ctrl_new_std(struct v4l2_ctrl_handler * hdl,const struct v4l2_ctrl_ops * ops,u32 id,s64 min,s64 max,u64 step,s64 def)2782 struct v4l2_ctrl *v4l2_ctrl_new_std(struct v4l2_ctrl_handler *hdl,
2783 const struct v4l2_ctrl_ops *ops,
2784 u32 id, s64 min, s64 max, u64 step, s64 def)
2785 {
2786 const char *name;
2787 enum v4l2_ctrl_type type;
2788 u32 flags;
2789
2790 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
2791 if (type == V4L2_CTRL_TYPE_MENU ||
2792 type == V4L2_CTRL_TYPE_INTEGER_MENU ||
2793 type >= V4L2_CTRL_COMPOUND_TYPES) {
2794 handler_set_err(hdl, -EINVAL);
2795 return NULL;
2796 }
2797 return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
2798 min, max, step, def, NULL, 0,
2799 flags, NULL, NULL, ptr_null, NULL);
2800 }
2801 EXPORT_SYMBOL(v4l2_ctrl_new_std);
2802
2803 /* Helper function for standard menu controls */
v4l2_ctrl_new_std_menu(struct v4l2_ctrl_handler * hdl,const struct v4l2_ctrl_ops * ops,u32 id,u8 _max,u64 mask,u8 _def)2804 struct v4l2_ctrl *v4l2_ctrl_new_std_menu(struct v4l2_ctrl_handler *hdl,
2805 const struct v4l2_ctrl_ops *ops,
2806 u32 id, u8 _max, u64 mask, u8 _def)
2807 {
2808 const char * const *qmenu = NULL;
2809 const s64 *qmenu_int = NULL;
2810 unsigned int qmenu_int_len = 0;
2811 const char *name;
2812 enum v4l2_ctrl_type type;
2813 s64 min;
2814 s64 max = _max;
2815 s64 def = _def;
2816 u64 step;
2817 u32 flags;
2818
2819 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
2820
2821 if (type == V4L2_CTRL_TYPE_MENU)
2822 qmenu = v4l2_ctrl_get_menu(id);
2823 else if (type == V4L2_CTRL_TYPE_INTEGER_MENU)
2824 qmenu_int = v4l2_ctrl_get_int_menu(id, &qmenu_int_len);
2825
2826 if ((!qmenu && !qmenu_int) || (qmenu_int && max > qmenu_int_len)) {
2827 handler_set_err(hdl, -EINVAL);
2828 return NULL;
2829 }
2830 return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
2831 0, max, mask, def, NULL, 0,
2832 flags, qmenu, qmenu_int, ptr_null, NULL);
2833 }
2834 EXPORT_SYMBOL(v4l2_ctrl_new_std_menu);
2835
2836 /* Helper function for standard menu controls with driver defined menu */
v4l2_ctrl_new_std_menu_items(struct v4l2_ctrl_handler * hdl,const struct v4l2_ctrl_ops * ops,u32 id,u8 _max,u64 mask,u8 _def,const char * const * qmenu)2837 struct v4l2_ctrl *v4l2_ctrl_new_std_menu_items(struct v4l2_ctrl_handler *hdl,
2838 const struct v4l2_ctrl_ops *ops, u32 id, u8 _max,
2839 u64 mask, u8 _def, const char * const *qmenu)
2840 {
2841 enum v4l2_ctrl_type type;
2842 const char *name;
2843 u32 flags;
2844 u64 step;
2845 s64 min;
2846 s64 max = _max;
2847 s64 def = _def;
2848
2849 /* v4l2_ctrl_new_std_menu_items() should only be called for
2850 * standard controls without a standard menu.
2851 */
2852 if (v4l2_ctrl_get_menu(id)) {
2853 handler_set_err(hdl, -EINVAL);
2854 return NULL;
2855 }
2856
2857 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
2858 if (type != V4L2_CTRL_TYPE_MENU || qmenu == NULL) {
2859 handler_set_err(hdl, -EINVAL);
2860 return NULL;
2861 }
2862 return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
2863 0, max, mask, def, NULL, 0,
2864 flags, qmenu, NULL, ptr_null, NULL);
2865
2866 }
2867 EXPORT_SYMBOL(v4l2_ctrl_new_std_menu_items);
2868
2869 /* Helper function for standard compound controls */
v4l2_ctrl_new_std_compound(struct v4l2_ctrl_handler * hdl,const struct v4l2_ctrl_ops * ops,u32 id,const union v4l2_ctrl_ptr p_def)2870 struct v4l2_ctrl *v4l2_ctrl_new_std_compound(struct v4l2_ctrl_handler *hdl,
2871 const struct v4l2_ctrl_ops *ops, u32 id,
2872 const union v4l2_ctrl_ptr p_def)
2873 {
2874 const char *name;
2875 enum v4l2_ctrl_type type;
2876 u32 flags;
2877 s64 min, max, step, def;
2878
2879 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
2880 if (type < V4L2_CTRL_COMPOUND_TYPES) {
2881 handler_set_err(hdl, -EINVAL);
2882 return NULL;
2883 }
2884 return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
2885 min, max, step, def, NULL, 0,
2886 flags, NULL, NULL, p_def, NULL);
2887 }
2888 EXPORT_SYMBOL(v4l2_ctrl_new_std_compound);
2889
2890 /* Helper function for standard integer menu controls */
v4l2_ctrl_new_int_menu(struct v4l2_ctrl_handler * hdl,const struct v4l2_ctrl_ops * ops,u32 id,u8 _max,u8 _def,const s64 * qmenu_int)2891 struct v4l2_ctrl *v4l2_ctrl_new_int_menu(struct v4l2_ctrl_handler *hdl,
2892 const struct v4l2_ctrl_ops *ops,
2893 u32 id, u8 _max, u8 _def, const s64 *qmenu_int)
2894 {
2895 const char *name;
2896 enum v4l2_ctrl_type type;
2897 s64 min;
2898 u64 step;
2899 s64 max = _max;
2900 s64 def = _def;
2901 u32 flags;
2902
2903 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
2904 if (type != V4L2_CTRL_TYPE_INTEGER_MENU) {
2905 handler_set_err(hdl, -EINVAL);
2906 return NULL;
2907 }
2908 return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
2909 0, max, 0, def, NULL, 0,
2910 flags, NULL, qmenu_int, ptr_null, NULL);
2911 }
2912 EXPORT_SYMBOL(v4l2_ctrl_new_int_menu);
2913
2914 /* Add the controls from another handler to our own. */
v4l2_ctrl_add_handler(struct v4l2_ctrl_handler * hdl,struct v4l2_ctrl_handler * add,bool (* filter)(const struct v4l2_ctrl * ctrl),bool from_other_dev)2915 int v4l2_ctrl_add_handler(struct v4l2_ctrl_handler *hdl,
2916 struct v4l2_ctrl_handler *add,
2917 bool (*filter)(const struct v4l2_ctrl *ctrl),
2918 bool from_other_dev)
2919 {
2920 struct v4l2_ctrl_ref *ref;
2921 int ret = 0;
2922
2923 /* Do nothing if either handler is NULL or if they are the same */
2924 if (!hdl || !add || hdl == add)
2925 return 0;
2926 if (hdl->error)
2927 return hdl->error;
2928 mutex_lock(add->lock);
2929 list_for_each_entry(ref, &add->ctrl_refs, node) {
2930 struct v4l2_ctrl *ctrl = ref->ctrl;
2931
2932 /* Skip handler-private controls. */
2933 if (ctrl->is_private)
2934 continue;
2935 /* And control classes */
2936 if (ctrl->type == V4L2_CTRL_TYPE_CTRL_CLASS)
2937 continue;
2938 /* Filter any unwanted controls */
2939 if (filter && !filter(ctrl))
2940 continue;
2941 ret = handler_new_ref(hdl, ctrl, NULL, from_other_dev, false);
2942 if (ret)
2943 break;
2944 }
2945 mutex_unlock(add->lock);
2946 return ret;
2947 }
2948 EXPORT_SYMBOL(v4l2_ctrl_add_handler);
2949
v4l2_ctrl_radio_filter(const struct v4l2_ctrl * ctrl)2950 bool v4l2_ctrl_radio_filter(const struct v4l2_ctrl *ctrl)
2951 {
2952 if (V4L2_CTRL_ID2WHICH(ctrl->id) == V4L2_CTRL_CLASS_FM_TX)
2953 return true;
2954 if (V4L2_CTRL_ID2WHICH(ctrl->id) == V4L2_CTRL_CLASS_FM_RX)
2955 return true;
2956 switch (ctrl->id) {
2957 case V4L2_CID_AUDIO_MUTE:
2958 case V4L2_CID_AUDIO_VOLUME:
2959 case V4L2_CID_AUDIO_BALANCE:
2960 case V4L2_CID_AUDIO_BASS:
2961 case V4L2_CID_AUDIO_TREBLE:
2962 case V4L2_CID_AUDIO_LOUDNESS:
2963 return true;
2964 default:
2965 break;
2966 }
2967 return false;
2968 }
2969 EXPORT_SYMBOL(v4l2_ctrl_radio_filter);
2970
2971 /* Cluster controls */
v4l2_ctrl_cluster(unsigned ncontrols,struct v4l2_ctrl ** controls)2972 void v4l2_ctrl_cluster(unsigned ncontrols, struct v4l2_ctrl **controls)
2973 {
2974 bool has_volatiles = false;
2975 int i;
2976
2977 /* The first control is the master control and it must not be NULL */
2978 if (WARN_ON(ncontrols == 0 || controls[0] == NULL))
2979 return;
2980
2981 for (i = 0; i < ncontrols; i++) {
2982 if (controls[i]) {
2983 controls[i]->cluster = controls;
2984 controls[i]->ncontrols = ncontrols;
2985 if (controls[i]->flags & V4L2_CTRL_FLAG_VOLATILE)
2986 has_volatiles = true;
2987 }
2988 }
2989 controls[0]->has_volatiles = has_volatiles;
2990 }
2991 EXPORT_SYMBOL(v4l2_ctrl_cluster);
2992
v4l2_ctrl_auto_cluster(unsigned ncontrols,struct v4l2_ctrl ** controls,u8 manual_val,bool set_volatile)2993 void v4l2_ctrl_auto_cluster(unsigned ncontrols, struct v4l2_ctrl **controls,
2994 u8 manual_val, bool set_volatile)
2995 {
2996 struct v4l2_ctrl *master = controls[0];
2997 u32 flag = 0;
2998 int i;
2999
3000 v4l2_ctrl_cluster(ncontrols, controls);
3001 WARN_ON(ncontrols <= 1);
3002 WARN_ON(manual_val < master->minimum || manual_val > master->maximum);
3003 WARN_ON(set_volatile && !has_op(master, g_volatile_ctrl));
3004 master->is_auto = true;
3005 master->has_volatiles = set_volatile;
3006 master->manual_mode_value = manual_val;
3007 master->flags |= V4L2_CTRL_FLAG_UPDATE;
3008
3009 if (!is_cur_manual(master))
3010 flag = V4L2_CTRL_FLAG_INACTIVE |
3011 (set_volatile ? V4L2_CTRL_FLAG_VOLATILE : 0);
3012
3013 for (i = 1; i < ncontrols; i++)
3014 if (controls[i])
3015 controls[i]->flags |= flag;
3016 }
3017 EXPORT_SYMBOL(v4l2_ctrl_auto_cluster);
3018
3019 /* Activate/deactivate a control. */
v4l2_ctrl_activate(struct v4l2_ctrl * ctrl,bool active)3020 void v4l2_ctrl_activate(struct v4l2_ctrl *ctrl, bool active)
3021 {
3022 /* invert since the actual flag is called 'inactive' */
3023 bool inactive = !active;
3024 bool old;
3025
3026 if (ctrl == NULL)
3027 return;
3028
3029 if (inactive)
3030 /* set V4L2_CTRL_FLAG_INACTIVE */
3031 old = test_and_set_bit(4, &ctrl->flags);
3032 else
3033 /* clear V4L2_CTRL_FLAG_INACTIVE */
3034 old = test_and_clear_bit(4, &ctrl->flags);
3035 if (old != inactive)
3036 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_FLAGS);
3037 }
3038 EXPORT_SYMBOL(v4l2_ctrl_activate);
3039
__v4l2_ctrl_grab(struct v4l2_ctrl * ctrl,bool grabbed)3040 void __v4l2_ctrl_grab(struct v4l2_ctrl *ctrl, bool grabbed)
3041 {
3042 bool old;
3043
3044 if (ctrl == NULL)
3045 return;
3046
3047 lockdep_assert_held(ctrl->handler->lock);
3048
3049 if (grabbed)
3050 /* set V4L2_CTRL_FLAG_GRABBED */
3051 old = test_and_set_bit(1, &ctrl->flags);
3052 else
3053 /* clear V4L2_CTRL_FLAG_GRABBED */
3054 old = test_and_clear_bit(1, &ctrl->flags);
3055 if (old != grabbed)
3056 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_FLAGS);
3057 }
3058 EXPORT_SYMBOL(__v4l2_ctrl_grab);
3059
3060 /* Log the control name and value */
log_ctrl(const struct v4l2_ctrl * ctrl,const char * prefix,const char * colon)3061 static void log_ctrl(const struct v4l2_ctrl *ctrl,
3062 const char *prefix, const char *colon)
3063 {
3064 if (ctrl->flags & (V4L2_CTRL_FLAG_DISABLED | V4L2_CTRL_FLAG_WRITE_ONLY))
3065 return;
3066 if (ctrl->type == V4L2_CTRL_TYPE_CTRL_CLASS)
3067 return;
3068
3069 pr_info("%s%s%s: ", prefix, colon, ctrl->name);
3070
3071 ctrl->type_ops->log(ctrl);
3072
3073 if (ctrl->flags & (V4L2_CTRL_FLAG_INACTIVE |
3074 V4L2_CTRL_FLAG_GRABBED |
3075 V4L2_CTRL_FLAG_VOLATILE)) {
3076 if (ctrl->flags & V4L2_CTRL_FLAG_INACTIVE)
3077 pr_cont(" inactive");
3078 if (ctrl->flags & V4L2_CTRL_FLAG_GRABBED)
3079 pr_cont(" grabbed");
3080 if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE)
3081 pr_cont(" volatile");
3082 }
3083 pr_cont("\n");
3084 }
3085
3086 /* Log all controls owned by the handler */
v4l2_ctrl_handler_log_status(struct v4l2_ctrl_handler * hdl,const char * prefix)3087 void v4l2_ctrl_handler_log_status(struct v4l2_ctrl_handler *hdl,
3088 const char *prefix)
3089 {
3090 struct v4l2_ctrl *ctrl;
3091 const char *colon = "";
3092 int len;
3093
3094 if (hdl == NULL)
3095 return;
3096 if (prefix == NULL)
3097 prefix = "";
3098 len = strlen(prefix);
3099 if (len && prefix[len - 1] != ' ')
3100 colon = ": ";
3101 mutex_lock(hdl->lock);
3102 list_for_each_entry(ctrl, &hdl->ctrls, node)
3103 if (!(ctrl->flags & V4L2_CTRL_FLAG_DISABLED))
3104 log_ctrl(ctrl, prefix, colon);
3105 mutex_unlock(hdl->lock);
3106 }
3107 EXPORT_SYMBOL(v4l2_ctrl_handler_log_status);
3108
v4l2_ctrl_subdev_log_status(struct v4l2_subdev * sd)3109 int v4l2_ctrl_subdev_log_status(struct v4l2_subdev *sd)
3110 {
3111 v4l2_ctrl_handler_log_status(sd->ctrl_handler, sd->name);
3112 return 0;
3113 }
3114 EXPORT_SYMBOL(v4l2_ctrl_subdev_log_status);
3115
3116 /* Call s_ctrl for all controls owned by the handler */
__v4l2_ctrl_handler_setup(struct v4l2_ctrl_handler * hdl)3117 int __v4l2_ctrl_handler_setup(struct v4l2_ctrl_handler *hdl)
3118 {
3119 struct v4l2_ctrl *ctrl;
3120 int ret = 0;
3121
3122 if (hdl == NULL)
3123 return 0;
3124
3125 lockdep_assert_held(hdl->lock);
3126
3127 list_for_each_entry(ctrl, &hdl->ctrls, node)
3128 ctrl->done = false;
3129
3130 list_for_each_entry(ctrl, &hdl->ctrls, node) {
3131 struct v4l2_ctrl *master = ctrl->cluster[0];
3132 int i;
3133
3134 /* Skip if this control was already handled by a cluster. */
3135 /* Skip button controls and read-only controls. */
3136 if (ctrl->done || ctrl->type == V4L2_CTRL_TYPE_BUTTON ||
3137 (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY))
3138 continue;
3139
3140 for (i = 0; i < master->ncontrols; i++) {
3141 if (master->cluster[i]) {
3142 cur_to_new(master->cluster[i]);
3143 master->cluster[i]->is_new = 1;
3144 master->cluster[i]->done = true;
3145 }
3146 }
3147 ret = call_op(master, s_ctrl);
3148 if (ret)
3149 break;
3150 }
3151
3152 return ret;
3153 }
3154 EXPORT_SYMBOL_GPL(__v4l2_ctrl_handler_setup);
3155
v4l2_ctrl_handler_setup(struct v4l2_ctrl_handler * hdl)3156 int v4l2_ctrl_handler_setup(struct v4l2_ctrl_handler *hdl)
3157 {
3158 int ret;
3159
3160 if (hdl == NULL)
3161 return 0;
3162
3163 mutex_lock(hdl->lock);
3164 ret = __v4l2_ctrl_handler_setup(hdl);
3165 mutex_unlock(hdl->lock);
3166
3167 return ret;
3168 }
3169 EXPORT_SYMBOL(v4l2_ctrl_handler_setup);
3170
3171 /* Implement VIDIOC_QUERY_EXT_CTRL */
v4l2_query_ext_ctrl(struct v4l2_ctrl_handler * hdl,struct v4l2_query_ext_ctrl * qc)3172 int v4l2_query_ext_ctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_query_ext_ctrl *qc)
3173 {
3174 const unsigned next_flags = V4L2_CTRL_FLAG_NEXT_CTRL | V4L2_CTRL_FLAG_NEXT_COMPOUND;
3175 u32 id = qc->id & V4L2_CTRL_ID_MASK;
3176 struct v4l2_ctrl_ref *ref;
3177 struct v4l2_ctrl *ctrl;
3178
3179 if (hdl == NULL)
3180 return -EINVAL;
3181
3182 mutex_lock(hdl->lock);
3183
3184 /* Try to find it */
3185 ref = find_ref(hdl, id);
3186
3187 if ((qc->id & next_flags) && !list_empty(&hdl->ctrl_refs)) {
3188 bool is_compound;
3189 /* Match any control that is not hidden */
3190 unsigned mask = 1;
3191 bool match = false;
3192
3193 if ((qc->id & next_flags) == V4L2_CTRL_FLAG_NEXT_COMPOUND) {
3194 /* Match any hidden control */
3195 match = true;
3196 } else if ((qc->id & next_flags) == next_flags) {
3197 /* Match any control, compound or not */
3198 mask = 0;
3199 }
3200
3201 /* Find the next control with ID > qc->id */
3202
3203 /* Did we reach the end of the control list? */
3204 if (id >= node2id(hdl->ctrl_refs.prev)) {
3205 ref = NULL; /* Yes, so there is no next control */
3206 } else if (ref) {
3207 /* We found a control with the given ID, so just get
3208 the next valid one in the list. */
3209 list_for_each_entry_continue(ref, &hdl->ctrl_refs, node) {
3210 is_compound = ref->ctrl->is_array ||
3211 ref->ctrl->type >= V4L2_CTRL_COMPOUND_TYPES;
3212 if (id < ref->ctrl->id &&
3213 (is_compound & mask) == match)
3214 break;
3215 }
3216 if (&ref->node == &hdl->ctrl_refs)
3217 ref = NULL;
3218 } else {
3219 /* No control with the given ID exists, so start
3220 searching for the next largest ID. We know there
3221 is one, otherwise the first 'if' above would have
3222 been true. */
3223 list_for_each_entry(ref, &hdl->ctrl_refs, node) {
3224 is_compound = ref->ctrl->is_array ||
3225 ref->ctrl->type >= V4L2_CTRL_COMPOUND_TYPES;
3226 if (id < ref->ctrl->id &&
3227 (is_compound & mask) == match)
3228 break;
3229 }
3230 if (&ref->node == &hdl->ctrl_refs)
3231 ref = NULL;
3232 }
3233 }
3234 mutex_unlock(hdl->lock);
3235
3236 if (!ref)
3237 return -EINVAL;
3238
3239 ctrl = ref->ctrl;
3240 memset(qc, 0, sizeof(*qc));
3241 if (id >= V4L2_CID_PRIVATE_BASE)
3242 qc->id = id;
3243 else
3244 qc->id = ctrl->id;
3245 strscpy(qc->name, ctrl->name, sizeof(qc->name));
3246 qc->flags = user_flags(ctrl);
3247 qc->type = ctrl->type;
3248 qc->elem_size = ctrl->elem_size;
3249 qc->elems = ctrl->elems;
3250 qc->nr_of_dims = ctrl->nr_of_dims;
3251 memcpy(qc->dims, ctrl->dims, qc->nr_of_dims * sizeof(qc->dims[0]));
3252 qc->minimum = ctrl->minimum;
3253 qc->maximum = ctrl->maximum;
3254 qc->default_value = ctrl->default_value;
3255 if (ctrl->type == V4L2_CTRL_TYPE_MENU
3256 || ctrl->type == V4L2_CTRL_TYPE_INTEGER_MENU)
3257 qc->step = 1;
3258 else
3259 qc->step = ctrl->step;
3260 return 0;
3261 }
3262 EXPORT_SYMBOL(v4l2_query_ext_ctrl);
3263
3264 /* Implement VIDIOC_QUERYCTRL */
v4l2_queryctrl(struct v4l2_ctrl_handler * hdl,struct v4l2_queryctrl * qc)3265 int v4l2_queryctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_queryctrl *qc)
3266 {
3267 struct v4l2_query_ext_ctrl qec = { qc->id };
3268 int rc;
3269
3270 rc = v4l2_query_ext_ctrl(hdl, &qec);
3271 if (rc)
3272 return rc;
3273
3274 qc->id = qec.id;
3275 qc->type = qec.type;
3276 qc->flags = qec.flags;
3277 strscpy(qc->name, qec.name, sizeof(qc->name));
3278 switch (qc->type) {
3279 case V4L2_CTRL_TYPE_INTEGER:
3280 case V4L2_CTRL_TYPE_BOOLEAN:
3281 case V4L2_CTRL_TYPE_MENU:
3282 case V4L2_CTRL_TYPE_INTEGER_MENU:
3283 case V4L2_CTRL_TYPE_STRING:
3284 case V4L2_CTRL_TYPE_BITMASK:
3285 qc->minimum = qec.minimum;
3286 qc->maximum = qec.maximum;
3287 qc->step = qec.step;
3288 qc->default_value = qec.default_value;
3289 break;
3290 default:
3291 qc->minimum = 0;
3292 qc->maximum = 0;
3293 qc->step = 0;
3294 qc->default_value = 0;
3295 break;
3296 }
3297 return 0;
3298 }
3299 EXPORT_SYMBOL(v4l2_queryctrl);
3300
3301 /* Implement VIDIOC_QUERYMENU */
v4l2_querymenu(struct v4l2_ctrl_handler * hdl,struct v4l2_querymenu * qm)3302 int v4l2_querymenu(struct v4l2_ctrl_handler *hdl, struct v4l2_querymenu *qm)
3303 {
3304 struct v4l2_ctrl *ctrl;
3305 u32 i = qm->index;
3306
3307 ctrl = v4l2_ctrl_find(hdl, qm->id);
3308 if (!ctrl)
3309 return -EINVAL;
3310
3311 qm->reserved = 0;
3312 /* Sanity checks */
3313 switch (ctrl->type) {
3314 case V4L2_CTRL_TYPE_MENU:
3315 if (ctrl->qmenu == NULL)
3316 return -EINVAL;
3317 break;
3318 case V4L2_CTRL_TYPE_INTEGER_MENU:
3319 if (ctrl->qmenu_int == NULL)
3320 return -EINVAL;
3321 break;
3322 default:
3323 return -EINVAL;
3324 }
3325
3326 if (i < ctrl->minimum || i > ctrl->maximum)
3327 return -EINVAL;
3328
3329 /* Use mask to see if this menu item should be skipped */
3330 if (ctrl->menu_skip_mask & (1ULL << i))
3331 return -EINVAL;
3332 /* Empty menu items should also be skipped */
3333 if (ctrl->type == V4L2_CTRL_TYPE_MENU) {
3334 if (ctrl->qmenu[i] == NULL || ctrl->qmenu[i][0] == '\0')
3335 return -EINVAL;
3336 strscpy(qm->name, ctrl->qmenu[i], sizeof(qm->name));
3337 } else {
3338 qm->value = ctrl->qmenu_int[i];
3339 }
3340 return 0;
3341 }
3342 EXPORT_SYMBOL(v4l2_querymenu);
3343
v4l2_ctrl_request_clone(struct v4l2_ctrl_handler * hdl,const struct v4l2_ctrl_handler * from)3344 static int v4l2_ctrl_request_clone(struct v4l2_ctrl_handler *hdl,
3345 const struct v4l2_ctrl_handler *from)
3346 {
3347 struct v4l2_ctrl_ref *ref;
3348 int err = 0;
3349
3350 if (WARN_ON(!hdl || hdl == from))
3351 return -EINVAL;
3352
3353 if (hdl->error)
3354 return hdl->error;
3355
3356 WARN_ON(hdl->lock != &hdl->_lock);
3357
3358 mutex_lock(from->lock);
3359 list_for_each_entry(ref, &from->ctrl_refs, node) {
3360 struct v4l2_ctrl *ctrl = ref->ctrl;
3361 struct v4l2_ctrl_ref *new_ref;
3362
3363 /* Skip refs inherited from other devices */
3364 if (ref->from_other_dev)
3365 continue;
3366 /* And buttons */
3367 if (ctrl->type == V4L2_CTRL_TYPE_BUTTON)
3368 continue;
3369 err = handler_new_ref(hdl, ctrl, &new_ref, false, true);
3370 if (err)
3371 break;
3372 }
3373 mutex_unlock(from->lock);
3374 return err;
3375 }
3376
v4l2_ctrl_request_queue(struct media_request_object * obj)3377 static void v4l2_ctrl_request_queue(struct media_request_object *obj)
3378 {
3379 struct v4l2_ctrl_handler *hdl =
3380 container_of(obj, struct v4l2_ctrl_handler, req_obj);
3381 struct v4l2_ctrl_handler *main_hdl = obj->priv;
3382 struct v4l2_ctrl_handler *prev_hdl = NULL;
3383 struct v4l2_ctrl_ref *ref_ctrl, *ref_ctrl_prev = NULL;
3384
3385 mutex_lock(main_hdl->lock);
3386 if (list_empty(&main_hdl->requests_queued))
3387 goto queue;
3388
3389 prev_hdl = list_last_entry(&main_hdl->requests_queued,
3390 struct v4l2_ctrl_handler, requests_queued);
3391 /*
3392 * Note: prev_hdl and hdl must contain the same list of control
3393 * references, so if any differences are detected then that is a
3394 * driver bug and the WARN_ON is triggered.
3395 */
3396 mutex_lock(prev_hdl->lock);
3397 ref_ctrl_prev = list_first_entry(&prev_hdl->ctrl_refs,
3398 struct v4l2_ctrl_ref, node);
3399 list_for_each_entry(ref_ctrl, &hdl->ctrl_refs, node) {
3400 if (ref_ctrl->req)
3401 continue;
3402 while (ref_ctrl_prev->ctrl->id < ref_ctrl->ctrl->id) {
3403 /* Should never happen, but just in case... */
3404 if (list_is_last(&ref_ctrl_prev->node,
3405 &prev_hdl->ctrl_refs))
3406 break;
3407 ref_ctrl_prev = list_next_entry(ref_ctrl_prev, node);
3408 }
3409 if (WARN_ON(ref_ctrl_prev->ctrl->id != ref_ctrl->ctrl->id))
3410 break;
3411 ref_ctrl->req = ref_ctrl_prev->req;
3412 }
3413 mutex_unlock(prev_hdl->lock);
3414 queue:
3415 list_add_tail(&hdl->requests_queued, &main_hdl->requests_queued);
3416 hdl->request_is_queued = true;
3417 mutex_unlock(main_hdl->lock);
3418 }
3419
v4l2_ctrl_request_unbind(struct media_request_object * obj)3420 static void v4l2_ctrl_request_unbind(struct media_request_object *obj)
3421 {
3422 struct v4l2_ctrl_handler *hdl =
3423 container_of(obj, struct v4l2_ctrl_handler, req_obj);
3424 struct v4l2_ctrl_handler *main_hdl = obj->priv;
3425
3426 list_del_init(&hdl->requests);
3427 mutex_lock(main_hdl->lock);
3428 if (hdl->request_is_queued) {
3429 list_del_init(&hdl->requests_queued);
3430 hdl->request_is_queued = false;
3431 }
3432 mutex_unlock(main_hdl->lock);
3433 }
3434
v4l2_ctrl_request_release(struct media_request_object * obj)3435 static void v4l2_ctrl_request_release(struct media_request_object *obj)
3436 {
3437 struct v4l2_ctrl_handler *hdl =
3438 container_of(obj, struct v4l2_ctrl_handler, req_obj);
3439
3440 v4l2_ctrl_handler_free(hdl);
3441 kfree(hdl);
3442 }
3443
3444 static const struct media_request_object_ops req_ops = {
3445 .queue = v4l2_ctrl_request_queue,
3446 .unbind = v4l2_ctrl_request_unbind,
3447 .release = v4l2_ctrl_request_release,
3448 };
3449
v4l2_ctrl_request_hdl_find(struct media_request * req,struct v4l2_ctrl_handler * parent)3450 struct v4l2_ctrl_handler *v4l2_ctrl_request_hdl_find(struct media_request *req,
3451 struct v4l2_ctrl_handler *parent)
3452 {
3453 struct media_request_object *obj;
3454
3455 if (WARN_ON(req->state != MEDIA_REQUEST_STATE_VALIDATING &&
3456 req->state != MEDIA_REQUEST_STATE_QUEUED))
3457 return NULL;
3458
3459 obj = media_request_object_find(req, &req_ops, parent);
3460 if (obj)
3461 return container_of(obj, struct v4l2_ctrl_handler, req_obj);
3462 return NULL;
3463 }
3464 EXPORT_SYMBOL_GPL(v4l2_ctrl_request_hdl_find);
3465
3466 struct v4l2_ctrl *
v4l2_ctrl_request_hdl_ctrl_find(struct v4l2_ctrl_handler * hdl,u32 id)3467 v4l2_ctrl_request_hdl_ctrl_find(struct v4l2_ctrl_handler *hdl, u32 id)
3468 {
3469 struct v4l2_ctrl_ref *ref = find_ref_lock(hdl, id);
3470
3471 return (ref && ref->req == ref) ? ref->ctrl : NULL;
3472 }
3473 EXPORT_SYMBOL_GPL(v4l2_ctrl_request_hdl_ctrl_find);
3474
v4l2_ctrl_request_bind(struct media_request * req,struct v4l2_ctrl_handler * hdl,struct v4l2_ctrl_handler * from)3475 static int v4l2_ctrl_request_bind(struct media_request *req,
3476 struct v4l2_ctrl_handler *hdl,
3477 struct v4l2_ctrl_handler *from)
3478 {
3479 int ret;
3480
3481 ret = v4l2_ctrl_request_clone(hdl, from);
3482
3483 if (!ret) {
3484 ret = media_request_object_bind(req, &req_ops,
3485 from, false, &hdl->req_obj);
3486 if (!ret)
3487 list_add_tail(&hdl->requests, &from->requests);
3488 }
3489 return ret;
3490 }
3491
3492 /* Some general notes on the atomic requirements of VIDIOC_G/TRY/S_EXT_CTRLS:
3493
3494 It is not a fully atomic operation, just best-effort only. After all, if
3495 multiple controls have to be set through multiple i2c writes (for example)
3496 then some initial writes may succeed while others fail. Thus leaving the
3497 system in an inconsistent state. The question is how much effort you are
3498 willing to spend on trying to make something atomic that really isn't.
3499
3500 From the point of view of an application the main requirement is that
3501 when you call VIDIOC_S_EXT_CTRLS and some values are invalid then an
3502 error should be returned without actually affecting any controls.
3503
3504 If all the values are correct, then it is acceptable to just give up
3505 in case of low-level errors.
3506
3507 It is important though that the application can tell when only a partial
3508 configuration was done. The way we do that is through the error_idx field
3509 of struct v4l2_ext_controls: if that is equal to the count field then no
3510 controls were affected. Otherwise all controls before that index were
3511 successful in performing their 'get' or 'set' operation, the control at
3512 the given index failed, and you don't know what happened with the controls
3513 after the failed one. Since if they were part of a control cluster they
3514 could have been successfully processed (if a cluster member was encountered
3515 at index < error_idx), they could have failed (if a cluster member was at
3516 error_idx), or they may not have been processed yet (if the first cluster
3517 member appeared after error_idx).
3518
3519 It is all fairly theoretical, though. In practice all you can do is to
3520 bail out. If error_idx == count, then it is an application bug. If
3521 error_idx < count then it is only an application bug if the error code was
3522 EBUSY. That usually means that something started streaming just when you
3523 tried to set the controls. In all other cases it is a driver/hardware
3524 problem and all you can do is to retry or bail out.
3525
3526 Note that these rules do not apply to VIDIOC_TRY_EXT_CTRLS: since that
3527 never modifies controls the error_idx is just set to whatever control
3528 has an invalid value.
3529 */
3530
3531 /* Prepare for the extended g/s/try functions.
3532 Find the controls in the control array and do some basic checks. */
prepare_ext_ctrls(struct v4l2_ctrl_handler * hdl,struct v4l2_ext_controls * cs,struct v4l2_ctrl_helper * helpers,struct video_device * vdev,bool get)3533 static int prepare_ext_ctrls(struct v4l2_ctrl_handler *hdl,
3534 struct v4l2_ext_controls *cs,
3535 struct v4l2_ctrl_helper *helpers,
3536 struct video_device *vdev,
3537 bool get)
3538 {
3539 struct v4l2_ctrl_helper *h;
3540 bool have_clusters = false;
3541 u32 i;
3542
3543 for (i = 0, h = helpers; i < cs->count; i++, h++) {
3544 struct v4l2_ext_control *c = &cs->controls[i];
3545 struct v4l2_ctrl_ref *ref;
3546 struct v4l2_ctrl *ctrl;
3547 u32 id = c->id & V4L2_CTRL_ID_MASK;
3548
3549 cs->error_idx = i;
3550
3551 if (cs->which &&
3552 cs->which != V4L2_CTRL_WHICH_DEF_VAL &&
3553 cs->which != V4L2_CTRL_WHICH_REQUEST_VAL &&
3554 V4L2_CTRL_ID2WHICH(id) != cs->which) {
3555 dprintk(vdev,
3556 "invalid which 0x%x or control id 0x%x\n",
3557 cs->which, id);
3558 return -EINVAL;
3559 }
3560
3561 /* Old-style private controls are not allowed for
3562 extended controls */
3563 if (id >= V4L2_CID_PRIVATE_BASE) {
3564 dprintk(vdev,
3565 "old-style private controls not allowed\n");
3566 return -EINVAL;
3567 }
3568 ref = find_ref_lock(hdl, id);
3569 if (ref == NULL) {
3570 dprintk(vdev, "cannot find control id 0x%x\n", id);
3571 return -EINVAL;
3572 }
3573 h->ref = ref;
3574 ctrl = ref->ctrl;
3575 if (ctrl->flags & V4L2_CTRL_FLAG_DISABLED) {
3576 dprintk(vdev, "control id 0x%x is disabled\n", id);
3577 return -EINVAL;
3578 }
3579
3580 if (ctrl->cluster[0]->ncontrols > 1)
3581 have_clusters = true;
3582 if (ctrl->cluster[0] != ctrl)
3583 ref = find_ref_lock(hdl, ctrl->cluster[0]->id);
3584 if (ctrl->is_ptr && !ctrl->is_string) {
3585 unsigned tot_size = ctrl->elems * ctrl->elem_size;
3586
3587 if (c->size < tot_size) {
3588 /*
3589 * In the get case the application first
3590 * queries to obtain the size of the control.
3591 */
3592 if (get) {
3593 c->size = tot_size;
3594 return -ENOSPC;
3595 }
3596 dprintk(vdev,
3597 "pointer control id 0x%x size too small, %d bytes but %d bytes needed\n",
3598 id, c->size, tot_size);
3599 return -EFAULT;
3600 }
3601 c->size = tot_size;
3602 }
3603 /* Store the ref to the master control of the cluster */
3604 h->mref = ref;
3605 /* Initially set next to 0, meaning that there is no other
3606 control in this helper array belonging to the same
3607 cluster */
3608 h->next = 0;
3609 }
3610
3611 /* We are done if there were no controls that belong to a multi-
3612 control cluster. */
3613 if (!have_clusters)
3614 return 0;
3615
3616 /* The code below figures out in O(n) time which controls in the list
3617 belong to the same cluster. */
3618
3619 /* This has to be done with the handler lock taken. */
3620 mutex_lock(hdl->lock);
3621
3622 /* First zero the helper field in the master control references */
3623 for (i = 0; i < cs->count; i++)
3624 helpers[i].mref->helper = NULL;
3625 for (i = 0, h = helpers; i < cs->count; i++, h++) {
3626 struct v4l2_ctrl_ref *mref = h->mref;
3627
3628 /* If the mref->helper is set, then it points to an earlier
3629 helper that belongs to the same cluster. */
3630 if (mref->helper) {
3631 /* Set the next field of mref->helper to the current
3632 index: this means that that earlier helper now
3633 points to the next helper in the same cluster. */
3634 mref->helper->next = i;
3635 /* mref should be set only for the first helper in the
3636 cluster, clear the others. */
3637 h->mref = NULL;
3638 }
3639 /* Point the mref helper to the current helper struct. */
3640 mref->helper = h;
3641 }
3642 mutex_unlock(hdl->lock);
3643 return 0;
3644 }
3645
3646 /* Handles the corner case where cs->count == 0. It checks whether the
3647 specified control class exists. If that class ID is 0, then it checks
3648 whether there are any controls at all. */
class_check(struct v4l2_ctrl_handler * hdl,u32 which)3649 static int class_check(struct v4l2_ctrl_handler *hdl, u32 which)
3650 {
3651 if (which == 0 || which == V4L2_CTRL_WHICH_DEF_VAL ||
3652 which == V4L2_CTRL_WHICH_REQUEST_VAL)
3653 return 0;
3654 return find_ref_lock(hdl, which | 1) ? 0 : -EINVAL;
3655 }
3656
3657 /* Get extended controls. Allocates the helpers array if needed. */
v4l2_g_ext_ctrls_common(struct v4l2_ctrl_handler * hdl,struct v4l2_ext_controls * cs,struct video_device * vdev)3658 static int v4l2_g_ext_ctrls_common(struct v4l2_ctrl_handler *hdl,
3659 struct v4l2_ext_controls *cs,
3660 struct video_device *vdev)
3661 {
3662 struct v4l2_ctrl_helper helper[4];
3663 struct v4l2_ctrl_helper *helpers = helper;
3664 int ret;
3665 int i, j;
3666 bool def_value;
3667
3668 def_value = (cs->which == V4L2_CTRL_WHICH_DEF_VAL);
3669
3670 cs->error_idx = cs->count;
3671 cs->which = V4L2_CTRL_ID2WHICH(cs->which);
3672
3673 if (hdl == NULL)
3674 return -EINVAL;
3675
3676 if (cs->count == 0)
3677 return class_check(hdl, cs->which);
3678
3679 if (cs->count > ARRAY_SIZE(helper)) {
3680 helpers = kvmalloc_array(cs->count, sizeof(helper[0]),
3681 GFP_KERNEL);
3682 if (helpers == NULL)
3683 return -ENOMEM;
3684 }
3685
3686 ret = prepare_ext_ctrls(hdl, cs, helpers, vdev, true);
3687 cs->error_idx = cs->count;
3688
3689 for (i = 0; !ret && i < cs->count; i++)
3690 if (helpers[i].ref->ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY)
3691 ret = -EACCES;
3692
3693 for (i = 0; !ret && i < cs->count; i++) {
3694 int (*ctrl_to_user)(struct v4l2_ext_control *c,
3695 struct v4l2_ctrl *ctrl);
3696 struct v4l2_ctrl *master;
3697
3698 ctrl_to_user = def_value ? def_to_user : cur_to_user;
3699
3700 if (helpers[i].mref == NULL)
3701 continue;
3702
3703 master = helpers[i].mref->ctrl;
3704 cs->error_idx = i;
3705
3706 v4l2_ctrl_lock(master);
3707
3708 /* g_volatile_ctrl will update the new control values */
3709 if (!def_value &&
3710 ((master->flags & V4L2_CTRL_FLAG_VOLATILE) ||
3711 (master->has_volatiles && !is_cur_manual(master)))) {
3712 for (j = 0; j < master->ncontrols; j++)
3713 cur_to_new(master->cluster[j]);
3714 ret = call_op(master, g_volatile_ctrl);
3715 ctrl_to_user = new_to_user;
3716 }
3717 /* If OK, then copy the current (for non-volatile controls)
3718 or the new (for volatile controls) control values to the
3719 caller */
3720 if (!ret) {
3721 u32 idx = i;
3722
3723 do {
3724 if (helpers[idx].ref->req)
3725 ret = req_to_user(cs->controls + idx,
3726 helpers[idx].ref->req);
3727 else
3728 ret = ctrl_to_user(cs->controls + idx,
3729 helpers[idx].ref->ctrl);
3730 idx = helpers[idx].next;
3731 } while (!ret && idx);
3732 }
3733 v4l2_ctrl_unlock(master);
3734 }
3735
3736 if (cs->count > ARRAY_SIZE(helper))
3737 kvfree(helpers);
3738 return ret;
3739 }
3740
3741 static struct media_request_object *
v4l2_ctrls_find_req_obj(struct v4l2_ctrl_handler * hdl,struct media_request * req,bool set)3742 v4l2_ctrls_find_req_obj(struct v4l2_ctrl_handler *hdl,
3743 struct media_request *req, bool set)
3744 {
3745 struct media_request_object *obj;
3746 struct v4l2_ctrl_handler *new_hdl;
3747 int ret;
3748
3749 if (IS_ERR(req))
3750 return ERR_CAST(req);
3751
3752 if (set && WARN_ON(req->state != MEDIA_REQUEST_STATE_UPDATING))
3753 return ERR_PTR(-EBUSY);
3754
3755 obj = media_request_object_find(req, &req_ops, hdl);
3756 if (obj)
3757 return obj;
3758 if (!set)
3759 return ERR_PTR(-ENOENT);
3760
3761 new_hdl = kzalloc(sizeof(*new_hdl), GFP_KERNEL);
3762 if (!new_hdl)
3763 return ERR_PTR(-ENOMEM);
3764
3765 obj = &new_hdl->req_obj;
3766 ret = v4l2_ctrl_handler_init(new_hdl, (hdl->nr_of_buckets - 1) * 8);
3767 if (!ret)
3768 ret = v4l2_ctrl_request_bind(req, new_hdl, hdl);
3769 if (ret) {
3770 kfree(new_hdl);
3771
3772 return ERR_PTR(ret);
3773 }
3774
3775 media_request_object_get(obj);
3776 return obj;
3777 }
3778
v4l2_g_ext_ctrls(struct v4l2_ctrl_handler * hdl,struct video_device * vdev,struct media_device * mdev,struct v4l2_ext_controls * cs)3779 int v4l2_g_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct video_device *vdev,
3780 struct media_device *mdev, struct v4l2_ext_controls *cs)
3781 {
3782 struct media_request_object *obj = NULL;
3783 struct media_request *req = NULL;
3784 int ret;
3785
3786 if (cs->which == V4L2_CTRL_WHICH_REQUEST_VAL) {
3787 if (!mdev || cs->request_fd < 0)
3788 return -EINVAL;
3789
3790 req = media_request_get_by_fd(mdev, cs->request_fd);
3791 if (IS_ERR(req))
3792 return PTR_ERR(req);
3793
3794 if (req->state != MEDIA_REQUEST_STATE_COMPLETE) {
3795 media_request_put(req);
3796 return -EACCES;
3797 }
3798
3799 ret = media_request_lock_for_access(req);
3800 if (ret) {
3801 media_request_put(req);
3802 return ret;
3803 }
3804
3805 obj = v4l2_ctrls_find_req_obj(hdl, req, false);
3806 if (IS_ERR(obj)) {
3807 media_request_unlock_for_access(req);
3808 media_request_put(req);
3809 return PTR_ERR(obj);
3810 }
3811
3812 hdl = container_of(obj, struct v4l2_ctrl_handler,
3813 req_obj);
3814 }
3815
3816 ret = v4l2_g_ext_ctrls_common(hdl, cs, vdev);
3817
3818 if (obj) {
3819 media_request_unlock_for_access(req);
3820 media_request_object_put(obj);
3821 media_request_put(req);
3822 }
3823 return ret;
3824 }
3825 EXPORT_SYMBOL(v4l2_g_ext_ctrls);
3826
3827 /* Helper function to get a single control */
get_ctrl(struct v4l2_ctrl * ctrl,struct v4l2_ext_control * c)3828 static int get_ctrl(struct v4l2_ctrl *ctrl, struct v4l2_ext_control *c)
3829 {
3830 struct v4l2_ctrl *master = ctrl->cluster[0];
3831 int ret = 0;
3832 int i;
3833
3834 /* Compound controls are not supported. The new_to_user() and
3835 * cur_to_user() calls below would need to be modified not to access
3836 * userspace memory when called from get_ctrl().
3837 */
3838 if (!ctrl->is_int && ctrl->type != V4L2_CTRL_TYPE_INTEGER64)
3839 return -EINVAL;
3840
3841 if (ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY)
3842 return -EACCES;
3843
3844 v4l2_ctrl_lock(master);
3845 /* g_volatile_ctrl will update the current control values */
3846 if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE) {
3847 for (i = 0; i < master->ncontrols; i++)
3848 cur_to_new(master->cluster[i]);
3849 ret = call_op(master, g_volatile_ctrl);
3850 new_to_user(c, ctrl);
3851 } else {
3852 cur_to_user(c, ctrl);
3853 }
3854 v4l2_ctrl_unlock(master);
3855 return ret;
3856 }
3857
v4l2_g_ctrl(struct v4l2_ctrl_handler * hdl,struct v4l2_control * control)3858 int v4l2_g_ctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_control *control)
3859 {
3860 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, control->id);
3861 struct v4l2_ext_control c;
3862 int ret;
3863
3864 if (ctrl == NULL || !ctrl->is_int)
3865 return -EINVAL;
3866 ret = get_ctrl(ctrl, &c);
3867 control->value = c.value;
3868 return ret;
3869 }
3870 EXPORT_SYMBOL(v4l2_g_ctrl);
3871
v4l2_ctrl_g_ctrl(struct v4l2_ctrl * ctrl)3872 s32 v4l2_ctrl_g_ctrl(struct v4l2_ctrl *ctrl)
3873 {
3874 struct v4l2_ext_control c;
3875
3876 /* It's a driver bug if this happens. */
3877 if (WARN_ON(!ctrl->is_int))
3878 return 0;
3879 c.value = 0;
3880 get_ctrl(ctrl, &c);
3881 return c.value;
3882 }
3883 EXPORT_SYMBOL(v4l2_ctrl_g_ctrl);
3884
v4l2_ctrl_g_ctrl_int64(struct v4l2_ctrl * ctrl)3885 s64 v4l2_ctrl_g_ctrl_int64(struct v4l2_ctrl *ctrl)
3886 {
3887 struct v4l2_ext_control c;
3888
3889 /* It's a driver bug if this happens. */
3890 if (WARN_ON(ctrl->is_ptr || ctrl->type != V4L2_CTRL_TYPE_INTEGER64))
3891 return 0;
3892 c.value64 = 0;
3893 get_ctrl(ctrl, &c);
3894 return c.value64;
3895 }
3896 EXPORT_SYMBOL(v4l2_ctrl_g_ctrl_int64);
3897
3898
3899 /* Core function that calls try/s_ctrl and ensures that the new value is
3900 copied to the current value on a set.
3901 Must be called with ctrl->handler->lock held. */
try_or_set_cluster(struct v4l2_fh * fh,struct v4l2_ctrl * master,bool set,u32 ch_flags)3902 static int try_or_set_cluster(struct v4l2_fh *fh, struct v4l2_ctrl *master,
3903 bool set, u32 ch_flags)
3904 {
3905 bool update_flag;
3906 int ret;
3907 int i;
3908
3909 /* Go through the cluster and either validate the new value or
3910 (if no new value was set), copy the current value to the new
3911 value, ensuring a consistent view for the control ops when
3912 called. */
3913 for (i = 0; i < master->ncontrols; i++) {
3914 struct v4l2_ctrl *ctrl = master->cluster[i];
3915
3916 if (ctrl == NULL)
3917 continue;
3918
3919 if (!ctrl->is_new) {
3920 cur_to_new(ctrl);
3921 continue;
3922 }
3923 /* Check again: it may have changed since the
3924 previous check in try_or_set_ext_ctrls(). */
3925 if (set && (ctrl->flags & V4L2_CTRL_FLAG_GRABBED))
3926 return -EBUSY;
3927 }
3928
3929 ret = call_op(master, try_ctrl);
3930
3931 /* Don't set if there is no change */
3932 if (ret || !set || !cluster_changed(master))
3933 return ret;
3934 ret = call_op(master, s_ctrl);
3935 if (ret)
3936 return ret;
3937
3938 /* If OK, then make the new values permanent. */
3939 update_flag = is_cur_manual(master) != is_new_manual(master);
3940
3941 for (i = 0; i < master->ncontrols; i++) {
3942 /*
3943 * If we switch from auto to manual mode, and this cluster
3944 * contains volatile controls, then all non-master controls
3945 * have to be marked as changed. The 'new' value contains
3946 * the volatile value (obtained by update_from_auto_cluster),
3947 * which now has to become the current value.
3948 */
3949 if (i && update_flag && is_new_manual(master) &&
3950 master->has_volatiles && master->cluster[i])
3951 master->cluster[i]->has_changed = true;
3952
3953 new_to_cur(fh, master->cluster[i], ch_flags |
3954 ((update_flag && i > 0) ? V4L2_EVENT_CTRL_CH_FLAGS : 0));
3955 }
3956 return 0;
3957 }
3958
3959 /* Validate controls. */
validate_ctrls(struct v4l2_ext_controls * cs,struct v4l2_ctrl_helper * helpers,struct video_device * vdev,bool set)3960 static int validate_ctrls(struct v4l2_ext_controls *cs,
3961 struct v4l2_ctrl_helper *helpers,
3962 struct video_device *vdev,
3963 bool set)
3964 {
3965 unsigned i;
3966 int ret = 0;
3967
3968 cs->error_idx = cs->count;
3969 for (i = 0; i < cs->count; i++) {
3970 struct v4l2_ctrl *ctrl = helpers[i].ref->ctrl;
3971 union v4l2_ctrl_ptr p_new;
3972
3973 cs->error_idx = i;
3974
3975 if (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY) {
3976 dprintk(vdev,
3977 "control id 0x%x is read-only\n",
3978 ctrl->id);
3979 return -EACCES;
3980 }
3981 /* This test is also done in try_set_control_cluster() which
3982 is called in atomic context, so that has the final say,
3983 but it makes sense to do an up-front check as well. Once
3984 an error occurs in try_set_control_cluster() some other
3985 controls may have been set already and we want to do a
3986 best-effort to avoid that. */
3987 if (set && (ctrl->flags & V4L2_CTRL_FLAG_GRABBED)) {
3988 dprintk(vdev,
3989 "control id 0x%x is grabbed, cannot set\n",
3990 ctrl->id);
3991 return -EBUSY;
3992 }
3993 /*
3994 * Skip validation for now if the payload needs to be copied
3995 * from userspace into kernelspace. We'll validate those later.
3996 */
3997 if (ctrl->is_ptr)
3998 continue;
3999 if (ctrl->type == V4L2_CTRL_TYPE_INTEGER64)
4000 p_new.p_s64 = &cs->controls[i].value64;
4001 else
4002 p_new.p_s32 = &cs->controls[i].value;
4003 ret = validate_new(ctrl, p_new);
4004 if (ret)
4005 return ret;
4006 }
4007 return 0;
4008 }
4009
4010 /* Obtain the current volatile values of an autocluster and mark them
4011 as new. */
update_from_auto_cluster(struct v4l2_ctrl * master)4012 static void update_from_auto_cluster(struct v4l2_ctrl *master)
4013 {
4014 int i;
4015
4016 for (i = 1; i < master->ncontrols; i++)
4017 cur_to_new(master->cluster[i]);
4018 if (!call_op(master, g_volatile_ctrl))
4019 for (i = 1; i < master->ncontrols; i++)
4020 if (master->cluster[i])
4021 master->cluster[i]->is_new = 1;
4022 }
4023
4024 /* Try or try-and-set controls */
try_set_ext_ctrls_common(struct v4l2_fh * fh,struct v4l2_ctrl_handler * hdl,struct v4l2_ext_controls * cs,struct video_device * vdev,bool set)4025 static int try_set_ext_ctrls_common(struct v4l2_fh *fh,
4026 struct v4l2_ctrl_handler *hdl,
4027 struct v4l2_ext_controls *cs,
4028 struct video_device *vdev, bool set)
4029 {
4030 struct v4l2_ctrl_helper helper[4];
4031 struct v4l2_ctrl_helper *helpers = helper;
4032 unsigned i, j;
4033 int ret;
4034
4035 cs->error_idx = cs->count;
4036
4037 /* Default value cannot be changed */
4038 if (cs->which == V4L2_CTRL_WHICH_DEF_VAL) {
4039 dprintk(vdev, "%s: cannot change default value\n",
4040 video_device_node_name(vdev));
4041 return -EINVAL;
4042 }
4043
4044 cs->which = V4L2_CTRL_ID2WHICH(cs->which);
4045
4046 if (hdl == NULL) {
4047 dprintk(vdev, "%s: invalid null control handler\n",
4048 video_device_node_name(vdev));
4049 return -EINVAL;
4050 }
4051
4052 if (cs->count == 0)
4053 return class_check(hdl, cs->which);
4054
4055 if (cs->count > ARRAY_SIZE(helper)) {
4056 helpers = kvmalloc_array(cs->count, sizeof(helper[0]),
4057 GFP_KERNEL);
4058 if (!helpers)
4059 return -ENOMEM;
4060 }
4061 ret = prepare_ext_ctrls(hdl, cs, helpers, vdev, false);
4062 if (!ret)
4063 ret = validate_ctrls(cs, helpers, vdev, set);
4064 if (ret && set)
4065 cs->error_idx = cs->count;
4066 for (i = 0; !ret && i < cs->count; i++) {
4067 struct v4l2_ctrl *master;
4068 u32 idx = i;
4069
4070 if (helpers[i].mref == NULL)
4071 continue;
4072
4073 cs->error_idx = i;
4074 master = helpers[i].mref->ctrl;
4075 v4l2_ctrl_lock(master);
4076
4077 /* Reset the 'is_new' flags of the cluster */
4078 for (j = 0; j < master->ncontrols; j++)
4079 if (master->cluster[j])
4080 master->cluster[j]->is_new = 0;
4081
4082 /* For volatile autoclusters that are currently in auto mode
4083 we need to discover if it will be set to manual mode.
4084 If so, then we have to copy the current volatile values
4085 first since those will become the new manual values (which
4086 may be overwritten by explicit new values from this set
4087 of controls). */
4088 if (master->is_auto && master->has_volatiles &&
4089 !is_cur_manual(master)) {
4090 /* Pick an initial non-manual value */
4091 s32 new_auto_val = master->manual_mode_value + 1;
4092 u32 tmp_idx = idx;
4093
4094 do {
4095 /* Check if the auto control is part of the
4096 list, and remember the new value. */
4097 if (helpers[tmp_idx].ref->ctrl == master)
4098 new_auto_val = cs->controls[tmp_idx].value;
4099 tmp_idx = helpers[tmp_idx].next;
4100 } while (tmp_idx);
4101 /* If the new value == the manual value, then copy
4102 the current volatile values. */
4103 if (new_auto_val == master->manual_mode_value)
4104 update_from_auto_cluster(master);
4105 }
4106
4107 /* Copy the new caller-supplied control values.
4108 user_to_new() sets 'is_new' to 1. */
4109 do {
4110 struct v4l2_ctrl *ctrl = helpers[idx].ref->ctrl;
4111
4112 ret = user_to_new(cs->controls + idx, ctrl);
4113 if (!ret && ctrl->is_ptr)
4114 ret = validate_new(ctrl, ctrl->p_new);
4115 idx = helpers[idx].next;
4116 } while (!ret && idx);
4117
4118 if (!ret)
4119 ret = try_or_set_cluster(fh, master,
4120 !hdl->req_obj.req && set, 0);
4121 if (!ret && hdl->req_obj.req && set) {
4122 for (j = 0; j < master->ncontrols; j++) {
4123 struct v4l2_ctrl_ref *ref =
4124 find_ref(hdl, master->cluster[j]->id);
4125
4126 new_to_req(ref);
4127 }
4128 }
4129
4130 /* Copy the new values back to userspace. */
4131 if (!ret) {
4132 idx = i;
4133 do {
4134 ret = new_to_user(cs->controls + idx,
4135 helpers[idx].ref->ctrl);
4136 idx = helpers[idx].next;
4137 } while (!ret && idx);
4138 }
4139 v4l2_ctrl_unlock(master);
4140 }
4141
4142 if (cs->count > ARRAY_SIZE(helper))
4143 kvfree(helpers);
4144 return ret;
4145 }
4146
try_set_ext_ctrls(struct v4l2_fh * fh,struct v4l2_ctrl_handler * hdl,struct video_device * vdev,struct media_device * mdev,struct v4l2_ext_controls * cs,bool set)4147 static int try_set_ext_ctrls(struct v4l2_fh *fh,
4148 struct v4l2_ctrl_handler *hdl,
4149 struct video_device *vdev,
4150 struct media_device *mdev,
4151 struct v4l2_ext_controls *cs, bool set)
4152 {
4153 struct media_request_object *obj = NULL;
4154 struct media_request *req = NULL;
4155 int ret;
4156
4157 if (cs->which == V4L2_CTRL_WHICH_REQUEST_VAL) {
4158 if (!mdev) {
4159 dprintk(vdev, "%s: missing media device\n",
4160 video_device_node_name(vdev));
4161 return -EINVAL;
4162 }
4163
4164 if (cs->request_fd < 0) {
4165 dprintk(vdev, "%s: invalid request fd %d\n",
4166 video_device_node_name(vdev), cs->request_fd);
4167 return -EINVAL;
4168 }
4169
4170 req = media_request_get_by_fd(mdev, cs->request_fd);
4171 if (IS_ERR(req)) {
4172 dprintk(vdev, "%s: cannot find request fd %d\n",
4173 video_device_node_name(vdev), cs->request_fd);
4174 return PTR_ERR(req);
4175 }
4176
4177 ret = media_request_lock_for_update(req);
4178 if (ret) {
4179 dprintk(vdev, "%s: cannot lock request fd %d\n",
4180 video_device_node_name(vdev), cs->request_fd);
4181 media_request_put(req);
4182 return ret;
4183 }
4184
4185 obj = v4l2_ctrls_find_req_obj(hdl, req, set);
4186 if (IS_ERR(obj)) {
4187 dprintk(vdev,
4188 "%s: cannot find request object for request fd %d\n",
4189 video_device_node_name(vdev),
4190 cs->request_fd);
4191 media_request_unlock_for_update(req);
4192 media_request_put(req);
4193 return PTR_ERR(obj);
4194 }
4195 hdl = container_of(obj, struct v4l2_ctrl_handler,
4196 req_obj);
4197 }
4198
4199 ret = try_set_ext_ctrls_common(fh, hdl, cs, vdev, set);
4200 if (ret)
4201 dprintk(vdev,
4202 "%s: try_set_ext_ctrls_common failed (%d)\n",
4203 video_device_node_name(vdev), ret);
4204
4205 if (obj) {
4206 media_request_unlock_for_update(req);
4207 media_request_object_put(obj);
4208 media_request_put(req);
4209 }
4210
4211 return ret;
4212 }
4213
v4l2_try_ext_ctrls(struct v4l2_ctrl_handler * hdl,struct video_device * vdev,struct media_device * mdev,struct v4l2_ext_controls * cs)4214 int v4l2_try_ext_ctrls(struct v4l2_ctrl_handler *hdl,
4215 struct video_device *vdev,
4216 struct media_device *mdev,
4217 struct v4l2_ext_controls *cs)
4218 {
4219 return try_set_ext_ctrls(NULL, hdl, vdev, mdev, cs, false);
4220 }
4221 EXPORT_SYMBOL(v4l2_try_ext_ctrls);
4222
v4l2_s_ext_ctrls(struct v4l2_fh * fh,struct v4l2_ctrl_handler * hdl,struct video_device * vdev,struct media_device * mdev,struct v4l2_ext_controls * cs)4223 int v4l2_s_ext_ctrls(struct v4l2_fh *fh,
4224 struct v4l2_ctrl_handler *hdl,
4225 struct video_device *vdev,
4226 struct media_device *mdev,
4227 struct v4l2_ext_controls *cs)
4228 {
4229 return try_set_ext_ctrls(fh, hdl, vdev, mdev, cs, true);
4230 }
4231 EXPORT_SYMBOL(v4l2_s_ext_ctrls);
4232
4233 /* Helper function for VIDIOC_S_CTRL compatibility */
set_ctrl(struct v4l2_fh * fh,struct v4l2_ctrl * ctrl,u32 ch_flags)4234 static int set_ctrl(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, u32 ch_flags)
4235 {
4236 struct v4l2_ctrl *master = ctrl->cluster[0];
4237 int ret;
4238 int i;
4239
4240 /* Reset the 'is_new' flags of the cluster */
4241 for (i = 0; i < master->ncontrols; i++)
4242 if (master->cluster[i])
4243 master->cluster[i]->is_new = 0;
4244
4245 ret = validate_new(ctrl, ctrl->p_new);
4246 if (ret)
4247 return ret;
4248
4249 /* For autoclusters with volatiles that are switched from auto to
4250 manual mode we have to update the current volatile values since
4251 those will become the initial manual values after such a switch. */
4252 if (master->is_auto && master->has_volatiles && ctrl == master &&
4253 !is_cur_manual(master) && ctrl->val == master->manual_mode_value)
4254 update_from_auto_cluster(master);
4255
4256 ctrl->is_new = 1;
4257 return try_or_set_cluster(fh, master, true, ch_flags);
4258 }
4259
4260 /* Helper function for VIDIOC_S_CTRL compatibility */
set_ctrl_lock(struct v4l2_fh * fh,struct v4l2_ctrl * ctrl,struct v4l2_ext_control * c)4261 static int set_ctrl_lock(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl,
4262 struct v4l2_ext_control *c)
4263 {
4264 int ret;
4265
4266 v4l2_ctrl_lock(ctrl);
4267 user_to_new(c, ctrl);
4268 ret = set_ctrl(fh, ctrl, 0);
4269 if (!ret)
4270 cur_to_user(c, ctrl);
4271 v4l2_ctrl_unlock(ctrl);
4272 return ret;
4273 }
4274
v4l2_s_ctrl(struct v4l2_fh * fh,struct v4l2_ctrl_handler * hdl,struct v4l2_control * control)4275 int v4l2_s_ctrl(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
4276 struct v4l2_control *control)
4277 {
4278 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, control->id);
4279 struct v4l2_ext_control c = { control->id };
4280 int ret;
4281
4282 if (ctrl == NULL || !ctrl->is_int)
4283 return -EINVAL;
4284
4285 if (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY)
4286 return -EACCES;
4287
4288 c.value = control->value;
4289 ret = set_ctrl_lock(fh, ctrl, &c);
4290 control->value = c.value;
4291 return ret;
4292 }
4293 EXPORT_SYMBOL(v4l2_s_ctrl);
4294
__v4l2_ctrl_s_ctrl(struct v4l2_ctrl * ctrl,s32 val)4295 int __v4l2_ctrl_s_ctrl(struct v4l2_ctrl *ctrl, s32 val)
4296 {
4297 lockdep_assert_held(ctrl->handler->lock);
4298
4299 /* It's a driver bug if this happens. */
4300 if (WARN_ON(!ctrl->is_int))
4301 return -EINVAL;
4302 ctrl->val = val;
4303 return set_ctrl(NULL, ctrl, 0);
4304 }
4305 EXPORT_SYMBOL(__v4l2_ctrl_s_ctrl);
4306
__v4l2_ctrl_s_ctrl_int64(struct v4l2_ctrl * ctrl,s64 val)4307 int __v4l2_ctrl_s_ctrl_int64(struct v4l2_ctrl *ctrl, s64 val)
4308 {
4309 lockdep_assert_held(ctrl->handler->lock);
4310
4311 /* It's a driver bug if this happens. */
4312 if (WARN_ON(ctrl->is_ptr || ctrl->type != V4L2_CTRL_TYPE_INTEGER64))
4313 return -EINVAL;
4314 *ctrl->p_new.p_s64 = val;
4315 return set_ctrl(NULL, ctrl, 0);
4316 }
4317 EXPORT_SYMBOL(__v4l2_ctrl_s_ctrl_int64);
4318
__v4l2_ctrl_s_ctrl_string(struct v4l2_ctrl * ctrl,const char * s)4319 int __v4l2_ctrl_s_ctrl_string(struct v4l2_ctrl *ctrl, const char *s)
4320 {
4321 lockdep_assert_held(ctrl->handler->lock);
4322
4323 /* It's a driver bug if this happens. */
4324 if (WARN_ON(ctrl->type != V4L2_CTRL_TYPE_STRING))
4325 return -EINVAL;
4326 strscpy(ctrl->p_new.p_char, s, ctrl->maximum + 1);
4327 return set_ctrl(NULL, ctrl, 0);
4328 }
4329 EXPORT_SYMBOL(__v4l2_ctrl_s_ctrl_string);
4330
__v4l2_ctrl_s_ctrl_compound(struct v4l2_ctrl * ctrl,enum v4l2_ctrl_type type,const void * p)4331 int __v4l2_ctrl_s_ctrl_compound(struct v4l2_ctrl *ctrl,
4332 enum v4l2_ctrl_type type, const void *p)
4333 {
4334 lockdep_assert_held(ctrl->handler->lock);
4335
4336 /* It's a driver bug if this happens. */
4337 if (WARN_ON(ctrl->type != type))
4338 return -EINVAL;
4339 memcpy(ctrl->p_new.p, p, ctrl->elems * ctrl->elem_size);
4340 return set_ctrl(NULL, ctrl, 0);
4341 }
4342 EXPORT_SYMBOL(__v4l2_ctrl_s_ctrl_compound);
4343
v4l2_ctrl_request_complete(struct media_request * req,struct v4l2_ctrl_handler * main_hdl)4344 void v4l2_ctrl_request_complete(struct media_request *req,
4345 struct v4l2_ctrl_handler *main_hdl)
4346 {
4347 struct media_request_object *obj;
4348 struct v4l2_ctrl_handler *hdl;
4349 struct v4l2_ctrl_ref *ref;
4350
4351 if (!req || !main_hdl)
4352 return;
4353
4354 /*
4355 * Note that it is valid if nothing was found. It means
4356 * that this request doesn't have any controls and so just
4357 * wants to leave the controls unchanged.
4358 */
4359 obj = media_request_object_find(req, &req_ops, main_hdl);
4360 if (!obj)
4361 return;
4362 hdl = container_of(obj, struct v4l2_ctrl_handler, req_obj);
4363
4364 list_for_each_entry(ref, &hdl->ctrl_refs, node) {
4365 struct v4l2_ctrl *ctrl = ref->ctrl;
4366 struct v4l2_ctrl *master = ctrl->cluster[0];
4367 unsigned int i;
4368
4369 if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE) {
4370 ref->req = ref;
4371
4372 v4l2_ctrl_lock(master);
4373 /* g_volatile_ctrl will update the current control values */
4374 for (i = 0; i < master->ncontrols; i++)
4375 cur_to_new(master->cluster[i]);
4376 call_op(master, g_volatile_ctrl);
4377 new_to_req(ref);
4378 v4l2_ctrl_unlock(master);
4379 continue;
4380 }
4381 if (ref->req == ref)
4382 continue;
4383
4384 v4l2_ctrl_lock(ctrl);
4385 if (ref->req) {
4386 ptr_to_ptr(ctrl, ref->req->p_req, ref->p_req);
4387 } else {
4388 ptr_to_ptr(ctrl, ctrl->p_cur, ref->p_req);
4389 /*
4390 * Set ref->req to ensure that when userspace wants to
4391 * obtain the controls of this request it will take
4392 * this value and not the current value of the control.
4393 */
4394 ref->req = ref;
4395 }
4396 v4l2_ctrl_unlock(ctrl);
4397 }
4398
4399 mutex_lock(main_hdl->lock);
4400 WARN_ON(!hdl->request_is_queued);
4401 list_del_init(&hdl->requests_queued);
4402 hdl->request_is_queued = false;
4403 mutex_unlock(main_hdl->lock);
4404 media_request_object_complete(obj);
4405 media_request_object_put(obj);
4406 }
4407 EXPORT_SYMBOL(v4l2_ctrl_request_complete);
4408
v4l2_ctrl_request_setup(struct media_request * req,struct v4l2_ctrl_handler * main_hdl)4409 int v4l2_ctrl_request_setup(struct media_request *req,
4410 struct v4l2_ctrl_handler *main_hdl)
4411 {
4412 struct media_request_object *obj;
4413 struct v4l2_ctrl_handler *hdl;
4414 struct v4l2_ctrl_ref *ref;
4415 int ret = 0;
4416
4417 if (!req || !main_hdl)
4418 return 0;
4419
4420 if (WARN_ON(req->state != MEDIA_REQUEST_STATE_QUEUED))
4421 return -EBUSY;
4422
4423 /*
4424 * Note that it is valid if nothing was found. It means
4425 * that this request doesn't have any controls and so just
4426 * wants to leave the controls unchanged.
4427 */
4428 obj = media_request_object_find(req, &req_ops, main_hdl);
4429 if (!obj)
4430 return 0;
4431 if (obj->completed) {
4432 media_request_object_put(obj);
4433 return -EBUSY;
4434 }
4435 hdl = container_of(obj, struct v4l2_ctrl_handler, req_obj);
4436
4437 list_for_each_entry(ref, &hdl->ctrl_refs, node)
4438 ref->req_done = false;
4439
4440 list_for_each_entry(ref, &hdl->ctrl_refs, node) {
4441 struct v4l2_ctrl *ctrl = ref->ctrl;
4442 struct v4l2_ctrl *master = ctrl->cluster[0];
4443 bool have_new_data = false;
4444 int i;
4445
4446 /*
4447 * Skip if this control was already handled by a cluster.
4448 * Skip button controls and read-only controls.
4449 */
4450 if (ref->req_done || ctrl->type == V4L2_CTRL_TYPE_BUTTON ||
4451 (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY))
4452 continue;
4453
4454 v4l2_ctrl_lock(master);
4455 for (i = 0; i < master->ncontrols; i++) {
4456 if (master->cluster[i]) {
4457 struct v4l2_ctrl_ref *r =
4458 find_ref(hdl, master->cluster[i]->id);
4459
4460 if (r->req && r == r->req) {
4461 have_new_data = true;
4462 break;
4463 }
4464 }
4465 }
4466 if (!have_new_data) {
4467 v4l2_ctrl_unlock(master);
4468 continue;
4469 }
4470
4471 for (i = 0; i < master->ncontrols; i++) {
4472 if (master->cluster[i]) {
4473 struct v4l2_ctrl_ref *r =
4474 find_ref(hdl, master->cluster[i]->id);
4475
4476 req_to_new(r);
4477 master->cluster[i]->is_new = 1;
4478 r->req_done = true;
4479 }
4480 }
4481 /*
4482 * For volatile autoclusters that are currently in auto mode
4483 * we need to discover if it will be set to manual mode.
4484 * If so, then we have to copy the current volatile values
4485 * first since those will become the new manual values (which
4486 * may be overwritten by explicit new values from this set
4487 * of controls).
4488 */
4489 if (master->is_auto && master->has_volatiles &&
4490 !is_cur_manual(master)) {
4491 s32 new_auto_val = *master->p_new.p_s32;
4492
4493 /*
4494 * If the new value == the manual value, then copy
4495 * the current volatile values.
4496 */
4497 if (new_auto_val == master->manual_mode_value)
4498 update_from_auto_cluster(master);
4499 }
4500
4501 ret = try_or_set_cluster(NULL, master, true, 0);
4502 v4l2_ctrl_unlock(master);
4503
4504 if (ret)
4505 break;
4506 }
4507
4508 media_request_object_put(obj);
4509 return ret;
4510 }
4511 EXPORT_SYMBOL(v4l2_ctrl_request_setup);
4512
v4l2_ctrl_notify(struct v4l2_ctrl * ctrl,v4l2_ctrl_notify_fnc notify,void * priv)4513 void v4l2_ctrl_notify(struct v4l2_ctrl *ctrl, v4l2_ctrl_notify_fnc notify, void *priv)
4514 {
4515 if (ctrl == NULL)
4516 return;
4517 if (notify == NULL) {
4518 ctrl->call_notify = 0;
4519 return;
4520 }
4521 if (WARN_ON(ctrl->handler->notify && ctrl->handler->notify != notify))
4522 return;
4523 ctrl->handler->notify = notify;
4524 ctrl->handler->notify_priv = priv;
4525 ctrl->call_notify = 1;
4526 }
4527 EXPORT_SYMBOL(v4l2_ctrl_notify);
4528
__v4l2_ctrl_modify_range(struct v4l2_ctrl * ctrl,s64 min,s64 max,u64 step,s64 def)4529 int __v4l2_ctrl_modify_range(struct v4l2_ctrl *ctrl,
4530 s64 min, s64 max, u64 step, s64 def)
4531 {
4532 bool value_changed;
4533 bool range_changed = false;
4534 int ret;
4535
4536 lockdep_assert_held(ctrl->handler->lock);
4537
4538 switch (ctrl->type) {
4539 case V4L2_CTRL_TYPE_INTEGER:
4540 case V4L2_CTRL_TYPE_INTEGER64:
4541 case V4L2_CTRL_TYPE_BOOLEAN:
4542 case V4L2_CTRL_TYPE_MENU:
4543 case V4L2_CTRL_TYPE_INTEGER_MENU:
4544 case V4L2_CTRL_TYPE_BITMASK:
4545 case V4L2_CTRL_TYPE_U8:
4546 case V4L2_CTRL_TYPE_U16:
4547 case V4L2_CTRL_TYPE_U32:
4548 if (ctrl->is_array)
4549 return -EINVAL;
4550 ret = check_range(ctrl->type, min, max, step, def);
4551 if (ret)
4552 return ret;
4553 break;
4554 default:
4555 return -EINVAL;
4556 }
4557 if ((ctrl->minimum != min) || (ctrl->maximum != max) ||
4558 (ctrl->step != step) || ctrl->default_value != def) {
4559 range_changed = true;
4560 ctrl->minimum = min;
4561 ctrl->maximum = max;
4562 ctrl->step = step;
4563 ctrl->default_value = def;
4564 }
4565 cur_to_new(ctrl);
4566 if (validate_new(ctrl, ctrl->p_new)) {
4567 if (ctrl->type == V4L2_CTRL_TYPE_INTEGER64)
4568 *ctrl->p_new.p_s64 = def;
4569 else
4570 *ctrl->p_new.p_s32 = def;
4571 }
4572
4573 if (ctrl->type == V4L2_CTRL_TYPE_INTEGER64)
4574 value_changed = *ctrl->p_new.p_s64 != *ctrl->p_cur.p_s64;
4575 else
4576 value_changed = *ctrl->p_new.p_s32 != *ctrl->p_cur.p_s32;
4577 if (value_changed)
4578 ret = set_ctrl(NULL, ctrl, V4L2_EVENT_CTRL_CH_RANGE);
4579 else if (range_changed)
4580 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_RANGE);
4581 return ret;
4582 }
4583 EXPORT_SYMBOL(__v4l2_ctrl_modify_range);
4584
v4l2_ctrl_add_event(struct v4l2_subscribed_event * sev,unsigned elems)4585 static int v4l2_ctrl_add_event(struct v4l2_subscribed_event *sev, unsigned elems)
4586 {
4587 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(sev->fh->ctrl_handler, sev->id);
4588
4589 if (ctrl == NULL)
4590 return -EINVAL;
4591
4592 v4l2_ctrl_lock(ctrl);
4593 list_add_tail(&sev->node, &ctrl->ev_subs);
4594 if (ctrl->type != V4L2_CTRL_TYPE_CTRL_CLASS &&
4595 (sev->flags & V4L2_EVENT_SUB_FL_SEND_INITIAL)) {
4596 struct v4l2_event ev;
4597 u32 changes = V4L2_EVENT_CTRL_CH_FLAGS;
4598
4599 if (!(ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY))
4600 changes |= V4L2_EVENT_CTRL_CH_VALUE;
4601 fill_event(&ev, ctrl, changes);
4602 /* Mark the queue as active, allowing this initial
4603 event to be accepted. */
4604 sev->elems = elems;
4605 v4l2_event_queue_fh(sev->fh, &ev);
4606 }
4607 v4l2_ctrl_unlock(ctrl);
4608 return 0;
4609 }
4610
v4l2_ctrl_del_event(struct v4l2_subscribed_event * sev)4611 static void v4l2_ctrl_del_event(struct v4l2_subscribed_event *sev)
4612 {
4613 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(sev->fh->ctrl_handler, sev->id);
4614
4615 if (ctrl == NULL)
4616 return;
4617
4618 v4l2_ctrl_lock(ctrl);
4619 list_del(&sev->node);
4620 v4l2_ctrl_unlock(ctrl);
4621 }
4622
v4l2_ctrl_replace(struct v4l2_event * old,const struct v4l2_event * new)4623 void v4l2_ctrl_replace(struct v4l2_event *old, const struct v4l2_event *new)
4624 {
4625 u32 old_changes = old->u.ctrl.changes;
4626
4627 old->u.ctrl = new->u.ctrl;
4628 old->u.ctrl.changes |= old_changes;
4629 }
4630 EXPORT_SYMBOL(v4l2_ctrl_replace);
4631
v4l2_ctrl_merge(const struct v4l2_event * old,struct v4l2_event * new)4632 void v4l2_ctrl_merge(const struct v4l2_event *old, struct v4l2_event *new)
4633 {
4634 new->u.ctrl.changes |= old->u.ctrl.changes;
4635 }
4636 EXPORT_SYMBOL(v4l2_ctrl_merge);
4637
4638 const struct v4l2_subscribed_event_ops v4l2_ctrl_sub_ev_ops = {
4639 .add = v4l2_ctrl_add_event,
4640 .del = v4l2_ctrl_del_event,
4641 .replace = v4l2_ctrl_replace,
4642 .merge = v4l2_ctrl_merge,
4643 };
4644 EXPORT_SYMBOL(v4l2_ctrl_sub_ev_ops);
4645
v4l2_ctrl_log_status(struct file * file,void * fh)4646 int v4l2_ctrl_log_status(struct file *file, void *fh)
4647 {
4648 struct video_device *vfd = video_devdata(file);
4649 struct v4l2_fh *vfh = file->private_data;
4650
4651 if (test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags) && vfd->v4l2_dev)
4652 v4l2_ctrl_handler_log_status(vfh->ctrl_handler,
4653 vfd->v4l2_dev->name);
4654 return 0;
4655 }
4656 EXPORT_SYMBOL(v4l2_ctrl_log_status);
4657
v4l2_ctrl_subscribe_event(struct v4l2_fh * fh,const struct v4l2_event_subscription * sub)4658 int v4l2_ctrl_subscribe_event(struct v4l2_fh *fh,
4659 const struct v4l2_event_subscription *sub)
4660 {
4661 if (sub->type == V4L2_EVENT_CTRL)
4662 return v4l2_event_subscribe(fh, sub, 0, &v4l2_ctrl_sub_ev_ops);
4663 return -EINVAL;
4664 }
4665 EXPORT_SYMBOL(v4l2_ctrl_subscribe_event);
4666
v4l2_ctrl_subdev_subscribe_event(struct v4l2_subdev * sd,struct v4l2_fh * fh,struct v4l2_event_subscription * sub)4667 int v4l2_ctrl_subdev_subscribe_event(struct v4l2_subdev *sd, struct v4l2_fh *fh,
4668 struct v4l2_event_subscription *sub)
4669 {
4670 if (!sd->ctrl_handler)
4671 return -EINVAL;
4672 return v4l2_ctrl_subscribe_event(fh, sub);
4673 }
4674 EXPORT_SYMBOL(v4l2_ctrl_subdev_subscribe_event);
4675
v4l2_ctrl_poll(struct file * file,struct poll_table_struct * wait)4676 __poll_t v4l2_ctrl_poll(struct file *file, struct poll_table_struct *wait)
4677 {
4678 struct v4l2_fh *fh = file->private_data;
4679
4680 poll_wait(file, &fh->wait, wait);
4681 if (v4l2_event_pending(fh))
4682 return EPOLLPRI;
4683 return 0;
4684 }
4685 EXPORT_SYMBOL(v4l2_ctrl_poll);
4686
v4l2_ctrl_new_fwnode_properties(struct v4l2_ctrl_handler * hdl,const struct v4l2_ctrl_ops * ctrl_ops,const struct v4l2_fwnode_device_properties * p)4687 int v4l2_ctrl_new_fwnode_properties(struct v4l2_ctrl_handler *hdl,
4688 const struct v4l2_ctrl_ops *ctrl_ops,
4689 const struct v4l2_fwnode_device_properties *p)
4690 {
4691 if (p->orientation != V4L2_FWNODE_PROPERTY_UNSET) {
4692 u32 orientation_ctrl;
4693
4694 switch (p->orientation) {
4695 case V4L2_FWNODE_ORIENTATION_FRONT:
4696 orientation_ctrl = V4L2_CAMERA_ORIENTATION_FRONT;
4697 break;
4698 case V4L2_FWNODE_ORIENTATION_BACK:
4699 orientation_ctrl = V4L2_CAMERA_ORIENTATION_BACK;
4700 break;
4701 case V4L2_FWNODE_ORIENTATION_EXTERNAL:
4702 orientation_ctrl = V4L2_CAMERA_ORIENTATION_EXTERNAL;
4703 break;
4704 default:
4705 return -EINVAL;
4706 }
4707 if (!v4l2_ctrl_new_std_menu(hdl, ctrl_ops,
4708 V4L2_CID_CAMERA_ORIENTATION,
4709 V4L2_CAMERA_ORIENTATION_EXTERNAL, 0,
4710 orientation_ctrl))
4711 return hdl->error;
4712 }
4713
4714 if (p->rotation != V4L2_FWNODE_PROPERTY_UNSET) {
4715 if (!v4l2_ctrl_new_std(hdl, ctrl_ops,
4716 V4L2_CID_CAMERA_SENSOR_ROTATION,
4717 p->rotation, p->rotation, 1,
4718 p->rotation))
4719 return hdl->error;
4720 }
4721
4722 return hdl->error;
4723 }
4724 EXPORT_SYMBOL(v4l2_ctrl_new_fwnode_properties);
4725
