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