1 /*
2 V4L2 controls framework implementation.
3
4 Copyright (C) 2010 Hans Verkuil <hverkuil@xs4all.nl>
5
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
10
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 */
20
21 #include <linux/ctype.h>
22 #include <linux/mm.h>
23 #include <linux/slab.h>
24 #include <linux/export.h>
25 #include <media/v4l2-ioctl.h>
26 #include <media/v4l2-device.h>
27 #include <media/v4l2-ctrls.h>
28 #include <media/v4l2-event.h>
29 #include <media/v4l2-dev.h>
30
31 #define has_op(master, op) \
32 (master->ops && master->ops->op)
33 #define call_op(master, op) \
34 (has_op(master, op) ? master->ops->op(master) : 0)
35
36 /* Internal temporary helper struct, one for each v4l2_ext_control */
37 struct v4l2_ctrl_helper {
38 /* Pointer to the control reference of the master control */
39 struct v4l2_ctrl_ref *mref;
40 /* The control corresponding to the v4l2_ext_control ID field. */
41 struct v4l2_ctrl *ctrl;
42 /* v4l2_ext_control index of the next control belonging to the
43 same cluster, or 0 if there isn't any. */
44 u32 next;
45 };
46
47 /* Small helper function to determine if the autocluster is set to manual
48 mode. */
is_cur_manual(const struct v4l2_ctrl * master)49 static bool is_cur_manual(const struct v4l2_ctrl *master)
50 {
51 return master->is_auto && master->cur.val == master->manual_mode_value;
52 }
53
54 /* Same as above, but this checks the against the new value instead of the
55 current value. */
is_new_manual(const struct v4l2_ctrl * master)56 static bool is_new_manual(const struct v4l2_ctrl *master)
57 {
58 return master->is_auto && master->val == master->manual_mode_value;
59 }
60
61 /* Returns NULL or a character pointer array containing the menu for
62 the given control ID. The pointer array ends with a NULL pointer.
63 An empty string signifies a menu entry that is invalid. This allows
64 drivers to disable certain options if it is not supported. */
v4l2_ctrl_get_menu(u32 id)65 const char * const *v4l2_ctrl_get_menu(u32 id)
66 {
67 static const char * const mpeg_audio_sampling_freq[] = {
68 "44.1 kHz",
69 "48 kHz",
70 "32 kHz",
71 NULL
72 };
73 static const char * const mpeg_audio_encoding[] = {
74 "MPEG-1/2 Layer I",
75 "MPEG-1/2 Layer II",
76 "MPEG-1/2 Layer III",
77 "MPEG-2/4 AAC",
78 "AC-3",
79 NULL
80 };
81 static const char * const mpeg_audio_l1_bitrate[] = {
82 "32 kbps",
83 "64 kbps",
84 "96 kbps",
85 "128 kbps",
86 "160 kbps",
87 "192 kbps",
88 "224 kbps",
89 "256 kbps",
90 "288 kbps",
91 "320 kbps",
92 "352 kbps",
93 "384 kbps",
94 "416 kbps",
95 "448 kbps",
96 NULL
97 };
98 static const char * const mpeg_audio_l2_bitrate[] = {
99 "32 kbps",
100 "48 kbps",
101 "56 kbps",
102 "64 kbps",
103 "80 kbps",
104 "96 kbps",
105 "112 kbps",
106 "128 kbps",
107 "160 kbps",
108 "192 kbps",
109 "224 kbps",
110 "256 kbps",
111 "320 kbps",
112 "384 kbps",
113 NULL
114 };
115 static const char * const mpeg_audio_l3_bitrate[] = {
116 "32 kbps",
117 "40 kbps",
118 "48 kbps",
119 "56 kbps",
120 "64 kbps",
121 "80 kbps",
122 "96 kbps",
123 "112 kbps",
124 "128 kbps",
125 "160 kbps",
126 "192 kbps",
127 "224 kbps",
128 "256 kbps",
129 "320 kbps",
130 NULL
131 };
132 static const char * const mpeg_audio_ac3_bitrate[] = {
133 "32 kbps",
134 "40 kbps",
135 "48 kbps",
136 "56 kbps",
137 "64 kbps",
138 "80 kbps",
139 "96 kbps",
140 "112 kbps",
141 "128 kbps",
142 "160 kbps",
143 "192 kbps",
144 "224 kbps",
145 "256 kbps",
146 "320 kbps",
147 "384 kbps",
148 "448 kbps",
149 "512 kbps",
150 "576 kbps",
151 "640 kbps",
152 NULL
153 };
154 static const char * const mpeg_audio_mode[] = {
155 "Stereo",
156 "Joint Stereo",
157 "Dual",
158 "Mono",
159 NULL
160 };
161 static const char * const mpeg_audio_mode_extension[] = {
162 "Bound 4",
163 "Bound 8",
164 "Bound 12",
165 "Bound 16",
166 NULL
167 };
168 static const char * const mpeg_audio_emphasis[] = {
169 "No Emphasis",
170 "50/15 us",
171 "CCITT J17",
172 NULL
173 };
174 static const char * const mpeg_audio_crc[] = {
175 "No CRC",
176 "16-bit CRC",
177 NULL
178 };
179 static const char * const mpeg_audio_dec_playback[] = {
180 "Auto",
181 "Stereo",
182 "Left",
183 "Right",
184 "Mono",
185 "Swapped Stereo",
186 NULL
187 };
188 static const char * const mpeg_video_encoding[] = {
189 "MPEG-1",
190 "MPEG-2",
191 "MPEG-4 AVC",
192 NULL
193 };
194 static const char * const mpeg_video_aspect[] = {
195 "1x1",
196 "4x3",
197 "16x9",
198 "2.21x1",
199 NULL
200 };
201 static const char * const mpeg_video_bitrate_mode[] = {
202 "Variable Bitrate",
203 "Constant Bitrate",
204 NULL
205 };
206 static const char * const mpeg_stream_type[] = {
207 "MPEG-2 Program Stream",
208 "MPEG-2 Transport Stream",
209 "MPEG-1 System Stream",
210 "MPEG-2 DVD-compatible Stream",
211 "MPEG-1 VCD-compatible Stream",
212 "MPEG-2 SVCD-compatible Stream",
213 NULL
214 };
215 static const char * const mpeg_stream_vbi_fmt[] = {
216 "No VBI",
217 "Private Packet, IVTV Format",
218 NULL
219 };
220 static const char * const camera_power_line_frequency[] = {
221 "Disabled",
222 "50 Hz",
223 "60 Hz",
224 "Auto",
225 NULL
226 };
227 static const char * const camera_exposure_auto[] = {
228 "Auto Mode",
229 "Manual Mode",
230 "Shutter Priority Mode",
231 "Aperture Priority Mode",
232 NULL
233 };
234 static const char * const camera_exposure_metering[] = {
235 "Average",
236 "Center Weighted",
237 "Spot",
238 "Matrix",
239 NULL
240 };
241 static const char * const camera_auto_focus_range[] = {
242 "Auto",
243 "Normal",
244 "Macro",
245 "Infinity",
246 NULL
247 };
248 static const char * const colorfx[] = {
249 "None",
250 "Black & White",
251 "Sepia",
252 "Negative",
253 "Emboss",
254 "Sketch",
255 "Sky Blue",
256 "Grass Green",
257 "Skin Whiten",
258 "Vivid",
259 "Aqua",
260 "Art Freeze",
261 "Silhouette",
262 "Solarization",
263 "Antique",
264 "Set Cb/Cr",
265 NULL
266 };
267 static const char * const auto_n_preset_white_balance[] = {
268 "Manual",
269 "Auto",
270 "Incandescent",
271 "Fluorescent",
272 "Fluorescent H",
273 "Horizon",
274 "Daylight",
275 "Flash",
276 "Cloudy",
277 "Shade",
278 NULL,
279 };
280 static const char * const camera_iso_sensitivity_auto[] = {
281 "Manual",
282 "Auto",
283 NULL
284 };
285 static const char * const scene_mode[] = {
286 "None",
287 "Backlight",
288 "Beach/Snow",
289 "Candle Light",
290 "Dusk/Dawn",
291 "Fall Colors",
292 "Fireworks",
293 "Landscape",
294 "Night",
295 "Party/Indoor",
296 "Portrait",
297 "Sports",
298 "Sunset",
299 "Text",
300 NULL
301 };
302 static const char * const tune_emphasis[] = {
303 "None",
304 "50 Microseconds",
305 "75 Microseconds",
306 NULL,
307 };
308 static const char * const header_mode[] = {
309 "Separate Buffer",
310 "Joined With 1st Frame",
311 NULL,
312 };
313 static const char * const multi_slice[] = {
314 "Single",
315 "Max Macroblocks",
316 "Max Bytes",
317 NULL,
318 };
319 static const char * const entropy_mode[] = {
320 "CAVLC",
321 "CABAC",
322 NULL,
323 };
324 static const char * const mpeg_h264_level[] = {
325 "1",
326 "1b",
327 "1.1",
328 "1.2",
329 "1.3",
330 "2",
331 "2.1",
332 "2.2",
333 "3",
334 "3.1",
335 "3.2",
336 "4",
337 "4.1",
338 "4.2",
339 "5",
340 "5.1",
341 NULL,
342 };
343 static const char * const h264_loop_filter[] = {
344 "Enabled",
345 "Disabled",
346 "Disabled at Slice Boundary",
347 NULL,
348 };
349 static const char * const h264_profile[] = {
350 "Baseline",
351 "Constrained Baseline",
352 "Main",
353 "Extended",
354 "High",
355 "High 10",
356 "High 422",
357 "High 444 Predictive",
358 "High 10 Intra",
359 "High 422 Intra",
360 "High 444 Intra",
361 "CAVLC 444 Intra",
362 "Scalable Baseline",
363 "Scalable High",
364 "Scalable High Intra",
365 "Stereo High",
366 "Multiview High",
367 NULL,
368 };
369 static const char * const vui_sar_idc[] = {
370 "Unspecified",
371 "1:1",
372 "12:11",
373 "10:11",
374 "16:11",
375 "40:33",
376 "24:11",
377 "20:11",
378 "32:11",
379 "80:33",
380 "18:11",
381 "15:11",
382 "64:33",
383 "160:99",
384 "4:3",
385 "3:2",
386 "2:1",
387 "Extended SAR",
388 NULL,
389 };
390 static const char * const h264_fp_arrangement_type[] = {
391 "Checkerboard",
392 "Column",
393 "Row",
394 "Side by Side",
395 "Top Bottom",
396 "Temporal",
397 NULL,
398 };
399 static const char * const h264_fmo_map_type[] = {
400 "Interleaved Slices",
401 "Scattered Slices",
402 "Foreground with Leftover",
403 "Box Out",
404 "Raster Scan",
405 "Wipe Scan",
406 "Explicit",
407 NULL,
408 };
409 static const char * const mpeg_mpeg4_level[] = {
410 "0",
411 "0b",
412 "1",
413 "2",
414 "3",
415 "3b",
416 "4",
417 "5",
418 NULL,
419 };
420 static const char * const mpeg4_profile[] = {
421 "Simple",
422 "Advanced Simple",
423 "Core",
424 "Simple Scalable",
425 "Advanced Coding Efficiency",
426 NULL,
427 };
428
429 static const char * const vpx_golden_frame_sel[] = {
430 "Use Previous Frame",
431 "Use Previous Specific Frame",
432 NULL,
433 };
434 static const char * const vp8_profile[] = {
435 "0",
436 "1",
437 "2",
438 "3",
439 NULL,
440 };
441 static const char * const vp9_profile[] = {
442 "0",
443 "1",
444 "2",
445 "3",
446 NULL,
447 };
448
449 static const char * const flash_led_mode[] = {
450 "Off",
451 "Flash",
452 "Torch",
453 NULL,
454 };
455 static const char * const flash_strobe_source[] = {
456 "Software",
457 "External",
458 NULL,
459 };
460
461 static const char * const jpeg_chroma_subsampling[] = {
462 "4:4:4",
463 "4:2:2",
464 "4:2:0",
465 "4:1:1",
466 "4:1:0",
467 "Gray",
468 NULL,
469 };
470 static const char * const dv_tx_mode[] = {
471 "DVI-D",
472 "HDMI",
473 NULL,
474 };
475 static const char * const dv_rgb_range[] = {
476 "Automatic",
477 "RGB Limited Range (16-235)",
478 "RGB Full Range (0-255)",
479 NULL,
480 };
481 static const char * const dv_it_content_type[] = {
482 "Graphics",
483 "Photo",
484 "Cinema",
485 "Game",
486 "No IT Content",
487 NULL,
488 };
489 static const char * const detect_md_mode[] = {
490 "Disabled",
491 "Global",
492 "Threshold Grid",
493 "Region Grid",
494 NULL,
495 };
496
497 static const char * const hevc_profile[] = {
498 "Main",
499 "Main Still Picture",
500 "Main 10",
501 NULL,
502 };
503 static const char * const hevc_level[] = {
504 "1",
505 "2",
506 "2.1",
507 "3",
508 "3.1",
509 "4",
510 "4.1",
511 "5",
512 "5.1",
513 "5.2",
514 "6",
515 "6.1",
516 "6.2",
517 NULL,
518 };
519 static const char * const hevc_hierarchial_coding_type[] = {
520 "B",
521 "P",
522 NULL,
523 };
524 static const char * const hevc_refresh_type[] = {
525 "None",
526 "CRA",
527 "IDR",
528 NULL,
529 };
530 static const char * const hevc_size_of_length_field[] = {
531 "0",
532 "1",
533 "2",
534 "4",
535 NULL,
536 };
537 static const char * const hevc_tier[] = {
538 "Main",
539 "High",
540 NULL,
541 };
542 static const char * const hevc_loop_filter_mode[] = {
543 "Disabled",
544 "Enabled",
545 "Disabled at slice boundary",
546 "NULL",
547 };
548
549 switch (id) {
550 case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ:
551 return mpeg_audio_sampling_freq;
552 case V4L2_CID_MPEG_AUDIO_ENCODING:
553 return mpeg_audio_encoding;
554 case V4L2_CID_MPEG_AUDIO_L1_BITRATE:
555 return mpeg_audio_l1_bitrate;
556 case V4L2_CID_MPEG_AUDIO_L2_BITRATE:
557 return mpeg_audio_l2_bitrate;
558 case V4L2_CID_MPEG_AUDIO_L3_BITRATE:
559 return mpeg_audio_l3_bitrate;
560 case V4L2_CID_MPEG_AUDIO_AC3_BITRATE:
561 return mpeg_audio_ac3_bitrate;
562 case V4L2_CID_MPEG_AUDIO_MODE:
563 return mpeg_audio_mode;
564 case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION:
565 return mpeg_audio_mode_extension;
566 case V4L2_CID_MPEG_AUDIO_EMPHASIS:
567 return mpeg_audio_emphasis;
568 case V4L2_CID_MPEG_AUDIO_CRC:
569 return mpeg_audio_crc;
570 case V4L2_CID_MPEG_AUDIO_DEC_PLAYBACK:
571 case V4L2_CID_MPEG_AUDIO_DEC_MULTILINGUAL_PLAYBACK:
572 return mpeg_audio_dec_playback;
573 case V4L2_CID_MPEG_VIDEO_ENCODING:
574 return mpeg_video_encoding;
575 case V4L2_CID_MPEG_VIDEO_ASPECT:
576 return mpeg_video_aspect;
577 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
578 return mpeg_video_bitrate_mode;
579 case V4L2_CID_MPEG_STREAM_TYPE:
580 return mpeg_stream_type;
581 case V4L2_CID_MPEG_STREAM_VBI_FMT:
582 return mpeg_stream_vbi_fmt;
583 case V4L2_CID_POWER_LINE_FREQUENCY:
584 return camera_power_line_frequency;
585 case V4L2_CID_EXPOSURE_AUTO:
586 return camera_exposure_auto;
587 case V4L2_CID_EXPOSURE_METERING:
588 return camera_exposure_metering;
589 case V4L2_CID_AUTO_FOCUS_RANGE:
590 return camera_auto_focus_range;
591 case V4L2_CID_COLORFX:
592 return colorfx;
593 case V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE:
594 return auto_n_preset_white_balance;
595 case V4L2_CID_ISO_SENSITIVITY_AUTO:
596 return camera_iso_sensitivity_auto;
597 case V4L2_CID_SCENE_MODE:
598 return scene_mode;
599 case V4L2_CID_TUNE_PREEMPHASIS:
600 return tune_emphasis;
601 case V4L2_CID_TUNE_DEEMPHASIS:
602 return tune_emphasis;
603 case V4L2_CID_FLASH_LED_MODE:
604 return flash_led_mode;
605 case V4L2_CID_FLASH_STROBE_SOURCE:
606 return flash_strobe_source;
607 case V4L2_CID_MPEG_VIDEO_HEADER_MODE:
608 return header_mode;
609 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE:
610 return multi_slice;
611 case V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE:
612 return entropy_mode;
613 case V4L2_CID_MPEG_VIDEO_H264_LEVEL:
614 return mpeg_h264_level;
615 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE:
616 return h264_loop_filter;
617 case V4L2_CID_MPEG_VIDEO_H264_PROFILE:
618 return h264_profile;
619 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC:
620 return vui_sar_idc;
621 case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE:
622 return h264_fp_arrangement_type;
623 case V4L2_CID_MPEG_VIDEO_H264_FMO_MAP_TYPE:
624 return h264_fmo_map_type;
625 case V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL:
626 return mpeg_mpeg4_level;
627 case V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE:
628 return mpeg4_profile;
629 case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_SEL:
630 return vpx_golden_frame_sel;
631 case V4L2_CID_MPEG_VIDEO_VP8_PROFILE:
632 return vp8_profile;
633 case V4L2_CID_MPEG_VIDEO_VP9_PROFILE:
634 return vp9_profile;
635 case V4L2_CID_JPEG_CHROMA_SUBSAMPLING:
636 return jpeg_chroma_subsampling;
637 case V4L2_CID_DV_TX_MODE:
638 return dv_tx_mode;
639 case V4L2_CID_DV_TX_RGB_RANGE:
640 case V4L2_CID_DV_RX_RGB_RANGE:
641 return dv_rgb_range;
642 case V4L2_CID_DV_TX_IT_CONTENT_TYPE:
643 case V4L2_CID_DV_RX_IT_CONTENT_TYPE:
644 return dv_it_content_type;
645 case V4L2_CID_DETECT_MD_MODE:
646 return detect_md_mode;
647 case V4L2_CID_MPEG_VIDEO_HEVC_PROFILE:
648 return hevc_profile;
649 case V4L2_CID_MPEG_VIDEO_HEVC_LEVEL:
650 return hevc_level;
651 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_TYPE:
652 return hevc_hierarchial_coding_type;
653 case V4L2_CID_MPEG_VIDEO_HEVC_REFRESH_TYPE:
654 return hevc_refresh_type;
655 case V4L2_CID_MPEG_VIDEO_HEVC_SIZE_OF_LENGTH_FIELD:
656 return hevc_size_of_length_field;
657 case V4L2_CID_MPEG_VIDEO_HEVC_TIER:
658 return hevc_tier;
659 case V4L2_CID_MPEG_VIDEO_HEVC_LOOP_FILTER_MODE:
660 return hevc_loop_filter_mode;
661
662 default:
663 return NULL;
664 }
665 }
666 EXPORT_SYMBOL(v4l2_ctrl_get_menu);
667
668 #define __v4l2_qmenu_int_len(arr, len) ({ *(len) = ARRAY_SIZE(arr); arr; })
669 /*
670 * Returns NULL or an s64 type array containing the menu for given
671 * control ID. The total number of the menu items is returned in @len.
672 */
v4l2_ctrl_get_int_menu(u32 id,u32 * len)673 const s64 *v4l2_ctrl_get_int_menu(u32 id, u32 *len)
674 {
675 static const s64 qmenu_int_vpx_num_partitions[] = {
676 1, 2, 4, 8,
677 };
678
679 static const s64 qmenu_int_vpx_num_ref_frames[] = {
680 1, 2, 3,
681 };
682
683 switch (id) {
684 case V4L2_CID_MPEG_VIDEO_VPX_NUM_PARTITIONS:
685 return __v4l2_qmenu_int_len(qmenu_int_vpx_num_partitions, len);
686 case V4L2_CID_MPEG_VIDEO_VPX_NUM_REF_FRAMES:
687 return __v4l2_qmenu_int_len(qmenu_int_vpx_num_ref_frames, len);
688 default:
689 *len = 0;
690 return NULL;
691 }
692 }
693 EXPORT_SYMBOL(v4l2_ctrl_get_int_menu);
694
695 /* Return the control name. */
v4l2_ctrl_get_name(u32 id)696 const char *v4l2_ctrl_get_name(u32 id)
697 {
698 switch (id) {
699 /* USER controls */
700 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
701 case V4L2_CID_USER_CLASS: return "User Controls";
702 case V4L2_CID_BRIGHTNESS: return "Brightness";
703 case V4L2_CID_CONTRAST: return "Contrast";
704 case V4L2_CID_SATURATION: return "Saturation";
705 case V4L2_CID_HUE: return "Hue";
706 case V4L2_CID_AUDIO_VOLUME: return "Volume";
707 case V4L2_CID_AUDIO_BALANCE: return "Balance";
708 case V4L2_CID_AUDIO_BASS: return "Bass";
709 case V4L2_CID_AUDIO_TREBLE: return "Treble";
710 case V4L2_CID_AUDIO_MUTE: return "Mute";
711 case V4L2_CID_AUDIO_LOUDNESS: return "Loudness";
712 case V4L2_CID_BLACK_LEVEL: return "Black Level";
713 case V4L2_CID_AUTO_WHITE_BALANCE: return "White Balance, Automatic";
714 case V4L2_CID_DO_WHITE_BALANCE: return "Do White Balance";
715 case V4L2_CID_RED_BALANCE: return "Red Balance";
716 case V4L2_CID_BLUE_BALANCE: return "Blue Balance";
717 case V4L2_CID_GAMMA: return "Gamma";
718 case V4L2_CID_EXPOSURE: return "Exposure";
719 case V4L2_CID_AUTOGAIN: return "Gain, Automatic";
720 case V4L2_CID_GAIN: return "Gain";
721 case V4L2_CID_HFLIP: return "Horizontal Flip";
722 case V4L2_CID_VFLIP: return "Vertical Flip";
723 case V4L2_CID_POWER_LINE_FREQUENCY: return "Power Line Frequency";
724 case V4L2_CID_HUE_AUTO: return "Hue, Automatic";
725 case V4L2_CID_WHITE_BALANCE_TEMPERATURE: return "White Balance Temperature";
726 case V4L2_CID_SHARPNESS: return "Sharpness";
727 case V4L2_CID_BACKLIGHT_COMPENSATION: return "Backlight Compensation";
728 case V4L2_CID_CHROMA_AGC: return "Chroma AGC";
729 case V4L2_CID_COLOR_KILLER: return "Color Killer";
730 case V4L2_CID_COLORFX: return "Color Effects";
731 case V4L2_CID_AUTOBRIGHTNESS: return "Brightness, Automatic";
732 case V4L2_CID_BAND_STOP_FILTER: return "Band-Stop Filter";
733 case V4L2_CID_ROTATE: return "Rotate";
734 case V4L2_CID_BG_COLOR: return "Background Color";
735 case V4L2_CID_CHROMA_GAIN: return "Chroma Gain";
736 case V4L2_CID_ILLUMINATORS_1: return "Illuminator 1";
737 case V4L2_CID_ILLUMINATORS_2: return "Illuminator 2";
738 case V4L2_CID_MIN_BUFFERS_FOR_CAPTURE: return "Min Number of Capture Buffers";
739 case V4L2_CID_MIN_BUFFERS_FOR_OUTPUT: return "Min Number of Output Buffers";
740 case V4L2_CID_ALPHA_COMPONENT: return "Alpha Component";
741 case V4L2_CID_COLORFX_CBCR: return "Color Effects, CbCr";
742
743 /* Codec controls */
744 /* The MPEG controls are applicable to all codec controls
745 * and the 'MPEG' part of the define is historical */
746 /* Keep the order of the 'case's the same as in videodev2.h! */
747 case V4L2_CID_MPEG_CLASS: return "Codec Controls";
748 case V4L2_CID_MPEG_STREAM_TYPE: return "Stream Type";
749 case V4L2_CID_MPEG_STREAM_PID_PMT: return "Stream PMT Program ID";
750 case V4L2_CID_MPEG_STREAM_PID_AUDIO: return "Stream Audio Program ID";
751 case V4L2_CID_MPEG_STREAM_PID_VIDEO: return "Stream Video Program ID";
752 case V4L2_CID_MPEG_STREAM_PID_PCR: return "Stream PCR Program ID";
753 case V4L2_CID_MPEG_STREAM_PES_ID_AUDIO: return "Stream PES Audio ID";
754 case V4L2_CID_MPEG_STREAM_PES_ID_VIDEO: return "Stream PES Video ID";
755 case V4L2_CID_MPEG_STREAM_VBI_FMT: return "Stream VBI Format";
756 case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ: return "Audio Sampling Frequency";
757 case V4L2_CID_MPEG_AUDIO_ENCODING: return "Audio Encoding";
758 case V4L2_CID_MPEG_AUDIO_L1_BITRATE: return "Audio Layer I Bitrate";
759 case V4L2_CID_MPEG_AUDIO_L2_BITRATE: return "Audio Layer II Bitrate";
760 case V4L2_CID_MPEG_AUDIO_L3_BITRATE: return "Audio Layer III Bitrate";
761 case V4L2_CID_MPEG_AUDIO_MODE: return "Audio Stereo Mode";
762 case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION: return "Audio Stereo Mode Extension";
763 case V4L2_CID_MPEG_AUDIO_EMPHASIS: return "Audio Emphasis";
764 case V4L2_CID_MPEG_AUDIO_CRC: return "Audio CRC";
765 case V4L2_CID_MPEG_AUDIO_MUTE: return "Audio Mute";
766 case V4L2_CID_MPEG_AUDIO_AAC_BITRATE: return "Audio AAC Bitrate";
767 case V4L2_CID_MPEG_AUDIO_AC3_BITRATE: return "Audio AC-3 Bitrate";
768 case V4L2_CID_MPEG_AUDIO_DEC_PLAYBACK: return "Audio Playback";
769 case V4L2_CID_MPEG_AUDIO_DEC_MULTILINGUAL_PLAYBACK: return "Audio Multilingual Playback";
770 case V4L2_CID_MPEG_VIDEO_ENCODING: return "Video Encoding";
771 case V4L2_CID_MPEG_VIDEO_ASPECT: return "Video Aspect";
772 case V4L2_CID_MPEG_VIDEO_B_FRAMES: return "Video B Frames";
773 case V4L2_CID_MPEG_VIDEO_GOP_SIZE: return "Video GOP Size";
774 case V4L2_CID_MPEG_VIDEO_GOP_CLOSURE: return "Video GOP Closure";
775 case V4L2_CID_MPEG_VIDEO_PULLDOWN: return "Video Pulldown";
776 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE: return "Video Bitrate Mode";
777 case V4L2_CID_MPEG_VIDEO_BITRATE: return "Video Bitrate";
778 case V4L2_CID_MPEG_VIDEO_BITRATE_PEAK: return "Video Peak Bitrate";
779 case V4L2_CID_MPEG_VIDEO_TEMPORAL_DECIMATION: return "Video Temporal Decimation";
780 case V4L2_CID_MPEG_VIDEO_MUTE: return "Video Mute";
781 case V4L2_CID_MPEG_VIDEO_MUTE_YUV: return "Video Mute YUV";
782 case V4L2_CID_MPEG_VIDEO_DECODER_SLICE_INTERFACE: return "Decoder Slice Interface";
783 case V4L2_CID_MPEG_VIDEO_DECODER_MPEG4_DEBLOCK_FILTER: return "MPEG4 Loop Filter Enable";
784 case V4L2_CID_MPEG_VIDEO_CYCLIC_INTRA_REFRESH_MB: return "Number of Intra Refresh MBs";
785 case V4L2_CID_MPEG_VIDEO_FRAME_RC_ENABLE: return "Frame Level Rate Control Enable";
786 case V4L2_CID_MPEG_VIDEO_MB_RC_ENABLE: return "H264 MB Level Rate Control";
787 case V4L2_CID_MPEG_VIDEO_HEADER_MODE: return "Sequence Header Mode";
788 case V4L2_CID_MPEG_VIDEO_MAX_REF_PIC: return "Max Number of Reference Pics";
789 case V4L2_CID_MPEG_VIDEO_H263_I_FRAME_QP: return "H263 I-Frame QP Value";
790 case V4L2_CID_MPEG_VIDEO_H263_P_FRAME_QP: return "H263 P-Frame QP Value";
791 case V4L2_CID_MPEG_VIDEO_H263_B_FRAME_QP: return "H263 B-Frame QP Value";
792 case V4L2_CID_MPEG_VIDEO_H263_MIN_QP: return "H263 Minimum QP Value";
793 case V4L2_CID_MPEG_VIDEO_H263_MAX_QP: return "H263 Maximum QP Value";
794 case V4L2_CID_MPEG_VIDEO_H264_I_FRAME_QP: return "H264 I-Frame QP Value";
795 case V4L2_CID_MPEG_VIDEO_H264_P_FRAME_QP: return "H264 P-Frame QP Value";
796 case V4L2_CID_MPEG_VIDEO_H264_B_FRAME_QP: return "H264 B-Frame QP Value";
797 case V4L2_CID_MPEG_VIDEO_H264_MAX_QP: return "H264 Maximum QP Value";
798 case V4L2_CID_MPEG_VIDEO_H264_MIN_QP: return "H264 Minimum QP Value";
799 case V4L2_CID_MPEG_VIDEO_H264_8X8_TRANSFORM: return "H264 8x8 Transform Enable";
800 case V4L2_CID_MPEG_VIDEO_H264_CPB_SIZE: return "H264 CPB Buffer Size";
801 case V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE: return "H264 Entropy Mode";
802 case V4L2_CID_MPEG_VIDEO_H264_I_PERIOD: return "H264 I-Frame Period";
803 case V4L2_CID_MPEG_VIDEO_H264_LEVEL: return "H264 Level";
804 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_ALPHA: return "H264 Loop Filter Alpha Offset";
805 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_BETA: return "H264 Loop Filter Beta Offset";
806 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE: return "H264 Loop Filter Mode";
807 case V4L2_CID_MPEG_VIDEO_H264_PROFILE: return "H264 Profile";
808 case V4L2_CID_MPEG_VIDEO_H264_VUI_EXT_SAR_HEIGHT: return "Vertical Size of SAR";
809 case V4L2_CID_MPEG_VIDEO_H264_VUI_EXT_SAR_WIDTH: return "Horizontal Size of SAR";
810 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_ENABLE: return "Aspect Ratio VUI Enable";
811 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC: return "VUI Aspect Ratio IDC";
812 case V4L2_CID_MPEG_VIDEO_H264_SEI_FRAME_PACKING: return "H264 Enable Frame Packing SEI";
813 case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_CURRENT_FRAME_0: return "H264 Set Curr. Frame as Frame0";
814 case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE: return "H264 FP Arrangement Type";
815 case V4L2_CID_MPEG_VIDEO_H264_FMO: return "H264 Flexible MB Ordering";
816 case V4L2_CID_MPEG_VIDEO_H264_FMO_MAP_TYPE: return "H264 Map Type for FMO";
817 case V4L2_CID_MPEG_VIDEO_H264_FMO_SLICE_GROUP: return "H264 FMO Number of Slice Groups";
818 case V4L2_CID_MPEG_VIDEO_H264_FMO_CHANGE_DIRECTION: return "H264 FMO Direction of Change";
819 case V4L2_CID_MPEG_VIDEO_H264_FMO_CHANGE_RATE: return "H264 FMO Size of 1st Slice Grp";
820 case V4L2_CID_MPEG_VIDEO_H264_FMO_RUN_LENGTH: return "H264 FMO No. of Consecutive MBs";
821 case V4L2_CID_MPEG_VIDEO_H264_ASO: return "H264 Arbitrary Slice Ordering";
822 case V4L2_CID_MPEG_VIDEO_H264_ASO_SLICE_ORDER: return "H264 ASO Slice Order";
823 case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING: return "Enable H264 Hierarchical Coding";
824 case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_TYPE: return "H264 Hierarchical Coding Type";
825 case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_LAYER:return "H264 Number of HC Layers";
826 case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_LAYER_QP:
827 return "H264 Set QP Value for HC Layers";
828 case V4L2_CID_MPEG_VIDEO_MPEG4_I_FRAME_QP: return "MPEG4 I-Frame QP Value";
829 case V4L2_CID_MPEG_VIDEO_MPEG4_P_FRAME_QP: return "MPEG4 P-Frame QP Value";
830 case V4L2_CID_MPEG_VIDEO_MPEG4_B_FRAME_QP: return "MPEG4 B-Frame QP Value";
831 case V4L2_CID_MPEG_VIDEO_MPEG4_MIN_QP: return "MPEG4 Minimum QP Value";
832 case V4L2_CID_MPEG_VIDEO_MPEG4_MAX_QP: return "MPEG4 Maximum QP Value";
833 case V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL: return "MPEG4 Level";
834 case V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE: return "MPEG4 Profile";
835 case V4L2_CID_MPEG_VIDEO_MPEG4_QPEL: return "Quarter Pixel Search Enable";
836 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MAX_BYTES: return "Maximum Bytes in a Slice";
837 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MAX_MB: return "Number of MBs in a Slice";
838 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE: return "Slice Partitioning Method";
839 case V4L2_CID_MPEG_VIDEO_VBV_SIZE: return "VBV Buffer Size";
840 case V4L2_CID_MPEG_VIDEO_DEC_PTS: return "Video Decoder PTS";
841 case V4L2_CID_MPEG_VIDEO_DEC_FRAME: return "Video Decoder Frame Count";
842 case V4L2_CID_MPEG_VIDEO_VBV_DELAY: return "Initial Delay for VBV Control";
843 case V4L2_CID_MPEG_VIDEO_MV_H_SEARCH_RANGE: return "Horizontal MV Search Range";
844 case V4L2_CID_MPEG_VIDEO_MV_V_SEARCH_RANGE: return "Vertical MV Search Range";
845 case V4L2_CID_MPEG_VIDEO_REPEAT_SEQ_HEADER: return "Repeat Sequence Header";
846 case V4L2_CID_MPEG_VIDEO_FORCE_KEY_FRAME: return "Force Key Frame";
847
848 /* VPX controls */
849 case V4L2_CID_MPEG_VIDEO_VPX_NUM_PARTITIONS: return "VPX Number of Partitions";
850 case V4L2_CID_MPEG_VIDEO_VPX_IMD_DISABLE_4X4: return "VPX Intra Mode Decision Disable";
851 case V4L2_CID_MPEG_VIDEO_VPX_NUM_REF_FRAMES: return "VPX No. of Refs for P Frame";
852 case V4L2_CID_MPEG_VIDEO_VPX_FILTER_LEVEL: return "VPX Loop Filter Level Range";
853 case V4L2_CID_MPEG_VIDEO_VPX_FILTER_SHARPNESS: return "VPX Deblocking Effect Control";
854 case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_REF_PERIOD: return "VPX Golden Frame Refresh Period";
855 case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_SEL: return "VPX Golden Frame Indicator";
856 case V4L2_CID_MPEG_VIDEO_VPX_MIN_QP: return "VPX Minimum QP Value";
857 case V4L2_CID_MPEG_VIDEO_VPX_MAX_QP: return "VPX Maximum QP Value";
858 case V4L2_CID_MPEG_VIDEO_VPX_I_FRAME_QP: return "VPX I-Frame QP Value";
859 case V4L2_CID_MPEG_VIDEO_VPX_P_FRAME_QP: return "VPX P-Frame QP Value";
860 case V4L2_CID_MPEG_VIDEO_VP8_PROFILE: return "VP8 Profile";
861 case V4L2_CID_MPEG_VIDEO_VP9_PROFILE: return "VP9 Profile";
862
863 /* HEVC controls */
864 case V4L2_CID_MPEG_VIDEO_HEVC_I_FRAME_QP: return "HEVC I-Frame QP Value";
865 case V4L2_CID_MPEG_VIDEO_HEVC_P_FRAME_QP: return "HEVC P-Frame QP Value";
866 case V4L2_CID_MPEG_VIDEO_HEVC_B_FRAME_QP: return "HEVC B-Frame QP Value";
867 case V4L2_CID_MPEG_VIDEO_HEVC_MIN_QP: return "HEVC Minimum QP Value";
868 case V4L2_CID_MPEG_VIDEO_HEVC_MAX_QP: return "HEVC Maximum QP Value";
869 case V4L2_CID_MPEG_VIDEO_HEVC_PROFILE: return "HEVC Profile";
870 case V4L2_CID_MPEG_VIDEO_HEVC_LEVEL: return "HEVC Level";
871 case V4L2_CID_MPEG_VIDEO_HEVC_TIER: return "HEVC Tier";
872 case V4L2_CID_MPEG_VIDEO_HEVC_FRAME_RATE_RESOLUTION: return "HEVC Frame Rate Resolution";
873 case V4L2_CID_MPEG_VIDEO_HEVC_MAX_PARTITION_DEPTH: return "HEVC Maximum Coding Unit Depth";
874 case V4L2_CID_MPEG_VIDEO_HEVC_REFRESH_TYPE: return "HEVC Refresh Type";
875 case V4L2_CID_MPEG_VIDEO_HEVC_CONST_INTRA_PRED: return "HEVC Constant Intra Prediction";
876 case V4L2_CID_MPEG_VIDEO_HEVC_LOSSLESS_CU: return "HEVC Lossless Encoding";
877 case V4L2_CID_MPEG_VIDEO_HEVC_WAVEFRONT: return "HEVC Wavefront";
878 case V4L2_CID_MPEG_VIDEO_HEVC_LOOP_FILTER_MODE: return "HEVC Loop Filter";
879 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_QP: return "HEVC QP Values";
880 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_TYPE: return "HEVC Hierarchical Coding Type";
881 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_LAYER: return "HEVC Hierarchical Coding Layer";
882 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L0_QP: return "HEVC Hierarchical Layer 0 QP";
883 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L1_QP: return "HEVC Hierarchical Layer 1 QP";
884 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L2_QP: return "HEVC Hierarchical Layer 2 QP";
885 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L3_QP: return "HEVC Hierarchical Layer 3 QP";
886 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L4_QP: return "HEVC Hierarchical Layer 4 QP";
887 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L5_QP: return "HEVC Hierarchical Layer 5 QP";
888 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L6_QP: return "HEVC Hierarchical Layer 6 QP";
889 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L0_BR: return "HEVC Hierarchical Lay 0 BitRate";
890 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L1_BR: return "HEVC Hierarchical Lay 1 BitRate";
891 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L2_BR: return "HEVC Hierarchical Lay 2 BitRate";
892 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L3_BR: return "HEVC Hierarchical Lay 3 BitRate";
893 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L4_BR: return "HEVC Hierarchical Lay 4 BitRate";
894 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L5_BR: return "HEVC Hierarchical Lay 5 BitRate";
895 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L6_BR: return "HEVC Hierarchical Lay 6 BitRate";
896 case V4L2_CID_MPEG_VIDEO_HEVC_GENERAL_PB: return "HEVC General PB";
897 case V4L2_CID_MPEG_VIDEO_HEVC_TEMPORAL_ID: return "HEVC Temporal ID";
898 case V4L2_CID_MPEG_VIDEO_HEVC_STRONG_SMOOTHING: return "HEVC Strong Intra Smoothing";
899 case V4L2_CID_MPEG_VIDEO_HEVC_INTRA_PU_SPLIT: return "HEVC Intra PU Split";
900 case V4L2_CID_MPEG_VIDEO_HEVC_TMV_PREDICTION: return "HEVC TMV Prediction";
901 case V4L2_CID_MPEG_VIDEO_HEVC_MAX_NUM_MERGE_MV_MINUS1: return "HEVC Max Num of Candidate MVs";
902 case V4L2_CID_MPEG_VIDEO_HEVC_WITHOUT_STARTCODE: return "HEVC ENC Without Startcode";
903 case V4L2_CID_MPEG_VIDEO_HEVC_REFRESH_PERIOD: return "HEVC Num of I-Frame b/w 2 IDR";
904 case V4L2_CID_MPEG_VIDEO_HEVC_LF_BETA_OFFSET_DIV2: return "HEVC Loop Filter Beta Offset";
905 case V4L2_CID_MPEG_VIDEO_HEVC_LF_TC_OFFSET_DIV2: return "HEVC Loop Filter TC Offset";
906 case V4L2_CID_MPEG_VIDEO_HEVC_SIZE_OF_LENGTH_FIELD: return "HEVC Size of Length Field";
907 case V4L2_CID_MPEG_VIDEO_REF_NUMBER_FOR_PFRAMES: return "Reference Frames for a P-Frame";
908 case V4L2_CID_MPEG_VIDEO_PREPEND_SPSPPS_TO_IDR: return "Prepend SPS and PPS to IDR";
909
910 /* CAMERA controls */
911 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
912 case V4L2_CID_CAMERA_CLASS: return "Camera Controls";
913 case V4L2_CID_EXPOSURE_AUTO: return "Auto Exposure";
914 case V4L2_CID_EXPOSURE_ABSOLUTE: return "Exposure Time, Absolute";
915 case V4L2_CID_EXPOSURE_AUTO_PRIORITY: return "Exposure, Dynamic Framerate";
916 case V4L2_CID_PAN_RELATIVE: return "Pan, Relative";
917 case V4L2_CID_TILT_RELATIVE: return "Tilt, Relative";
918 case V4L2_CID_PAN_RESET: return "Pan, Reset";
919 case V4L2_CID_TILT_RESET: return "Tilt, Reset";
920 case V4L2_CID_PAN_ABSOLUTE: return "Pan, Absolute";
921 case V4L2_CID_TILT_ABSOLUTE: return "Tilt, Absolute";
922 case V4L2_CID_FOCUS_ABSOLUTE: return "Focus, Absolute";
923 case V4L2_CID_FOCUS_RELATIVE: return "Focus, Relative";
924 case V4L2_CID_FOCUS_AUTO: return "Focus, Automatic Continuous";
925 case V4L2_CID_ZOOM_ABSOLUTE: return "Zoom, Absolute";
926 case V4L2_CID_ZOOM_RELATIVE: return "Zoom, Relative";
927 case V4L2_CID_ZOOM_CONTINUOUS: return "Zoom, Continuous";
928 case V4L2_CID_PRIVACY: return "Privacy";
929 case V4L2_CID_IRIS_ABSOLUTE: return "Iris, Absolute";
930 case V4L2_CID_IRIS_RELATIVE: return "Iris, Relative";
931 case V4L2_CID_AUTO_EXPOSURE_BIAS: return "Auto Exposure, Bias";
932 case V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE: return "White Balance, Auto & Preset";
933 case V4L2_CID_WIDE_DYNAMIC_RANGE: return "Wide Dynamic Range";
934 case V4L2_CID_IMAGE_STABILIZATION: return "Image Stabilization";
935 case V4L2_CID_ISO_SENSITIVITY: return "ISO Sensitivity";
936 case V4L2_CID_ISO_SENSITIVITY_AUTO: return "ISO Sensitivity, Auto";
937 case V4L2_CID_EXPOSURE_METERING: return "Exposure, Metering Mode";
938 case V4L2_CID_SCENE_MODE: return "Scene Mode";
939 case V4L2_CID_3A_LOCK: return "3A Lock";
940 case V4L2_CID_AUTO_FOCUS_START: return "Auto Focus, Start";
941 case V4L2_CID_AUTO_FOCUS_STOP: return "Auto Focus, Stop";
942 case V4L2_CID_AUTO_FOCUS_STATUS: return "Auto Focus, Status";
943 case V4L2_CID_AUTO_FOCUS_RANGE: return "Auto Focus, Range";
944 case V4L2_CID_PAN_SPEED: return "Pan, Speed";
945 case V4L2_CID_TILT_SPEED: return "Tilt, Speed";
946
947 /* FM Radio Modulator controls */
948 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
949 case V4L2_CID_FM_TX_CLASS: return "FM Radio Modulator Controls";
950 case V4L2_CID_RDS_TX_DEVIATION: return "RDS Signal Deviation";
951 case V4L2_CID_RDS_TX_PI: return "RDS Program ID";
952 case V4L2_CID_RDS_TX_PTY: return "RDS Program Type";
953 case V4L2_CID_RDS_TX_PS_NAME: return "RDS PS Name";
954 case V4L2_CID_RDS_TX_RADIO_TEXT: return "RDS Radio Text";
955 case V4L2_CID_RDS_TX_MONO_STEREO: return "RDS Stereo";
956 case V4L2_CID_RDS_TX_ARTIFICIAL_HEAD: return "RDS Artificial Head";
957 case V4L2_CID_RDS_TX_COMPRESSED: return "RDS Compressed";
958 case V4L2_CID_RDS_TX_DYNAMIC_PTY: return "RDS Dynamic PTY";
959 case V4L2_CID_RDS_TX_TRAFFIC_ANNOUNCEMENT: return "RDS Traffic Announcement";
960 case V4L2_CID_RDS_TX_TRAFFIC_PROGRAM: return "RDS Traffic Program";
961 case V4L2_CID_RDS_TX_MUSIC_SPEECH: return "RDS Music";
962 case V4L2_CID_RDS_TX_ALT_FREQS_ENABLE: return "RDS Enable Alt Frequencies";
963 case V4L2_CID_RDS_TX_ALT_FREQS: return "RDS Alternate Frequencies";
964 case V4L2_CID_AUDIO_LIMITER_ENABLED: return "Audio Limiter Feature Enabled";
965 case V4L2_CID_AUDIO_LIMITER_RELEASE_TIME: return "Audio Limiter Release Time";
966 case V4L2_CID_AUDIO_LIMITER_DEVIATION: return "Audio Limiter Deviation";
967 case V4L2_CID_AUDIO_COMPRESSION_ENABLED: return "Audio Compression Enabled";
968 case V4L2_CID_AUDIO_COMPRESSION_GAIN: return "Audio Compression Gain";
969 case V4L2_CID_AUDIO_COMPRESSION_THRESHOLD: return "Audio Compression Threshold";
970 case V4L2_CID_AUDIO_COMPRESSION_ATTACK_TIME: return "Audio Compression Attack Time";
971 case V4L2_CID_AUDIO_COMPRESSION_RELEASE_TIME: return "Audio Compression Release Time";
972 case V4L2_CID_PILOT_TONE_ENABLED: return "Pilot Tone Feature Enabled";
973 case V4L2_CID_PILOT_TONE_DEVIATION: return "Pilot Tone Deviation";
974 case V4L2_CID_PILOT_TONE_FREQUENCY: return "Pilot Tone Frequency";
975 case V4L2_CID_TUNE_PREEMPHASIS: return "Pre-Emphasis";
976 case V4L2_CID_TUNE_POWER_LEVEL: return "Tune Power Level";
977 case V4L2_CID_TUNE_ANTENNA_CAPACITOR: return "Tune Antenna Capacitor";
978
979 /* Flash controls */
980 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
981 case V4L2_CID_FLASH_CLASS: return "Flash Controls";
982 case V4L2_CID_FLASH_LED_MODE: return "LED Mode";
983 case V4L2_CID_FLASH_STROBE_SOURCE: return "Strobe Source";
984 case V4L2_CID_FLASH_STROBE: return "Strobe";
985 case V4L2_CID_FLASH_STROBE_STOP: return "Stop Strobe";
986 case V4L2_CID_FLASH_STROBE_STATUS: return "Strobe Status";
987 case V4L2_CID_FLASH_TIMEOUT: return "Strobe Timeout";
988 case V4L2_CID_FLASH_INTENSITY: return "Intensity, Flash Mode";
989 case V4L2_CID_FLASH_TORCH_INTENSITY: return "Intensity, Torch Mode";
990 case V4L2_CID_FLASH_INDICATOR_INTENSITY: return "Intensity, Indicator";
991 case V4L2_CID_FLASH_FAULT: return "Faults";
992 case V4L2_CID_FLASH_CHARGE: return "Charge";
993 case V4L2_CID_FLASH_READY: return "Ready to Strobe";
994
995 /* JPEG encoder controls */
996 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
997 case V4L2_CID_JPEG_CLASS: return "JPEG Compression Controls";
998 case V4L2_CID_JPEG_CHROMA_SUBSAMPLING: return "Chroma Subsampling";
999 case V4L2_CID_JPEG_RESTART_INTERVAL: return "Restart Interval";
1000 case V4L2_CID_JPEG_COMPRESSION_QUALITY: return "Compression Quality";
1001 case V4L2_CID_JPEG_ACTIVE_MARKER: return "Active Markers";
1002
1003 /* Image source controls */
1004 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
1005 case V4L2_CID_IMAGE_SOURCE_CLASS: return "Image Source Controls";
1006 case V4L2_CID_VBLANK: return "Vertical Blanking";
1007 case V4L2_CID_HBLANK: return "Horizontal Blanking";
1008 case V4L2_CID_ANALOGUE_GAIN: return "Analogue Gain";
1009 case V4L2_CID_TEST_PATTERN_RED: return "Red Pixel Value";
1010 case V4L2_CID_TEST_PATTERN_GREENR: return "Green (Red) Pixel Value";
1011 case V4L2_CID_TEST_PATTERN_BLUE: return "Blue Pixel Value";
1012 case V4L2_CID_TEST_PATTERN_GREENB: return "Green (Blue) Pixel Value";
1013
1014 /* Image processing controls */
1015 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
1016 case V4L2_CID_IMAGE_PROC_CLASS: return "Image Processing Controls";
1017 case V4L2_CID_LINK_FREQ: return "Link Frequency";
1018 case V4L2_CID_PIXEL_RATE: return "Pixel Rate";
1019 case V4L2_CID_TEST_PATTERN: return "Test Pattern";
1020 case V4L2_CID_DEINTERLACING_MODE: return "Deinterlacing Mode";
1021 case V4L2_CID_DIGITAL_GAIN: return "Digital Gain";
1022
1023 /* DV controls */
1024 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
1025 case V4L2_CID_DV_CLASS: return "Digital Video Controls";
1026 case V4L2_CID_DV_TX_HOTPLUG: return "Hotplug Present";
1027 case V4L2_CID_DV_TX_RXSENSE: return "RxSense Present";
1028 case V4L2_CID_DV_TX_EDID_PRESENT: return "EDID Present";
1029 case V4L2_CID_DV_TX_MODE: return "Transmit Mode";
1030 case V4L2_CID_DV_TX_RGB_RANGE: return "Tx RGB Quantization Range";
1031 case V4L2_CID_DV_TX_IT_CONTENT_TYPE: return "Tx IT Content Type";
1032 case V4L2_CID_DV_RX_POWER_PRESENT: return "Power Present";
1033 case V4L2_CID_DV_RX_RGB_RANGE: return "Rx RGB Quantization Range";
1034 case V4L2_CID_DV_RX_IT_CONTENT_TYPE: return "Rx IT Content Type";
1035
1036 case V4L2_CID_FM_RX_CLASS: return "FM Radio Receiver Controls";
1037 case V4L2_CID_TUNE_DEEMPHASIS: return "De-Emphasis";
1038 case V4L2_CID_RDS_RECEPTION: return "RDS Reception";
1039 case V4L2_CID_RF_TUNER_CLASS: return "RF Tuner Controls";
1040 case V4L2_CID_RF_TUNER_RF_GAIN: return "RF Gain";
1041 case V4L2_CID_RF_TUNER_LNA_GAIN_AUTO: return "LNA Gain, Auto";
1042 case V4L2_CID_RF_TUNER_LNA_GAIN: return "LNA Gain";
1043 case V4L2_CID_RF_TUNER_MIXER_GAIN_AUTO: return "Mixer Gain, Auto";
1044 case V4L2_CID_RF_TUNER_MIXER_GAIN: return "Mixer Gain";
1045 case V4L2_CID_RF_TUNER_IF_GAIN_AUTO: return "IF Gain, Auto";
1046 case V4L2_CID_RF_TUNER_IF_GAIN: return "IF Gain";
1047 case V4L2_CID_RF_TUNER_BANDWIDTH_AUTO: return "Bandwidth, Auto";
1048 case V4L2_CID_RF_TUNER_BANDWIDTH: return "Bandwidth";
1049 case V4L2_CID_RF_TUNER_PLL_LOCK: return "PLL Lock";
1050 case V4L2_CID_RDS_RX_PTY: return "RDS Program Type";
1051 case V4L2_CID_RDS_RX_PS_NAME: return "RDS PS Name";
1052 case V4L2_CID_RDS_RX_RADIO_TEXT: return "RDS Radio Text";
1053 case V4L2_CID_RDS_RX_TRAFFIC_ANNOUNCEMENT: return "RDS Traffic Announcement";
1054 case V4L2_CID_RDS_RX_TRAFFIC_PROGRAM: return "RDS Traffic Program";
1055 case V4L2_CID_RDS_RX_MUSIC_SPEECH: return "RDS Music";
1056
1057 /* Detection controls */
1058 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
1059 case V4L2_CID_DETECT_CLASS: return "Detection Controls";
1060 case V4L2_CID_DETECT_MD_MODE: return "Motion Detection Mode";
1061 case V4L2_CID_DETECT_MD_GLOBAL_THRESHOLD: return "MD Global Threshold";
1062 case V4L2_CID_DETECT_MD_THRESHOLD_GRID: return "MD Threshold Grid";
1063 case V4L2_CID_DETECT_MD_REGION_GRID: return "MD Region Grid";
1064 default:
1065 return NULL;
1066 }
1067 }
1068 EXPORT_SYMBOL(v4l2_ctrl_get_name);
1069
v4l2_ctrl_fill(u32 id,const char ** name,enum v4l2_ctrl_type * type,s64 * min,s64 * max,u64 * step,s64 * def,u32 * flags)1070 void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type,
1071 s64 *min, s64 *max, u64 *step, s64 *def, u32 *flags)
1072 {
1073 *name = v4l2_ctrl_get_name(id);
1074 *flags = 0;
1075
1076 switch (id) {
1077 case V4L2_CID_AUDIO_MUTE:
1078 case V4L2_CID_AUDIO_LOUDNESS:
1079 case V4L2_CID_AUTO_WHITE_BALANCE:
1080 case V4L2_CID_AUTOGAIN:
1081 case V4L2_CID_HFLIP:
1082 case V4L2_CID_VFLIP:
1083 case V4L2_CID_HUE_AUTO:
1084 case V4L2_CID_CHROMA_AGC:
1085 case V4L2_CID_COLOR_KILLER:
1086 case V4L2_CID_AUTOBRIGHTNESS:
1087 case V4L2_CID_MPEG_AUDIO_MUTE:
1088 case V4L2_CID_MPEG_VIDEO_MUTE:
1089 case V4L2_CID_MPEG_VIDEO_GOP_CLOSURE:
1090 case V4L2_CID_MPEG_VIDEO_PULLDOWN:
1091 case V4L2_CID_EXPOSURE_AUTO_PRIORITY:
1092 case V4L2_CID_FOCUS_AUTO:
1093 case V4L2_CID_PRIVACY:
1094 case V4L2_CID_AUDIO_LIMITER_ENABLED:
1095 case V4L2_CID_AUDIO_COMPRESSION_ENABLED:
1096 case V4L2_CID_PILOT_TONE_ENABLED:
1097 case V4L2_CID_ILLUMINATORS_1:
1098 case V4L2_CID_ILLUMINATORS_2:
1099 case V4L2_CID_FLASH_STROBE_STATUS:
1100 case V4L2_CID_FLASH_CHARGE:
1101 case V4L2_CID_FLASH_READY:
1102 case V4L2_CID_MPEG_VIDEO_DECODER_MPEG4_DEBLOCK_FILTER:
1103 case V4L2_CID_MPEG_VIDEO_DECODER_SLICE_INTERFACE:
1104 case V4L2_CID_MPEG_VIDEO_FRAME_RC_ENABLE:
1105 case V4L2_CID_MPEG_VIDEO_MB_RC_ENABLE:
1106 case V4L2_CID_MPEG_VIDEO_H264_8X8_TRANSFORM:
1107 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_ENABLE:
1108 case V4L2_CID_MPEG_VIDEO_MPEG4_QPEL:
1109 case V4L2_CID_MPEG_VIDEO_REPEAT_SEQ_HEADER:
1110 case V4L2_CID_WIDE_DYNAMIC_RANGE:
1111 case V4L2_CID_IMAGE_STABILIZATION:
1112 case V4L2_CID_RDS_RECEPTION:
1113 case V4L2_CID_RF_TUNER_LNA_GAIN_AUTO:
1114 case V4L2_CID_RF_TUNER_MIXER_GAIN_AUTO:
1115 case V4L2_CID_RF_TUNER_IF_GAIN_AUTO:
1116 case V4L2_CID_RF_TUNER_BANDWIDTH_AUTO:
1117 case V4L2_CID_RF_TUNER_PLL_LOCK:
1118 case V4L2_CID_RDS_TX_MONO_STEREO:
1119 case V4L2_CID_RDS_TX_ARTIFICIAL_HEAD:
1120 case V4L2_CID_RDS_TX_COMPRESSED:
1121 case V4L2_CID_RDS_TX_DYNAMIC_PTY:
1122 case V4L2_CID_RDS_TX_TRAFFIC_ANNOUNCEMENT:
1123 case V4L2_CID_RDS_TX_TRAFFIC_PROGRAM:
1124 case V4L2_CID_RDS_TX_MUSIC_SPEECH:
1125 case V4L2_CID_RDS_TX_ALT_FREQS_ENABLE:
1126 case V4L2_CID_RDS_RX_TRAFFIC_ANNOUNCEMENT:
1127 case V4L2_CID_RDS_RX_TRAFFIC_PROGRAM:
1128 case V4L2_CID_RDS_RX_MUSIC_SPEECH:
1129 *type = V4L2_CTRL_TYPE_BOOLEAN;
1130 *min = 0;
1131 *max = *step = 1;
1132 break;
1133 case V4L2_CID_ROTATE:
1134 *type = V4L2_CTRL_TYPE_INTEGER;
1135 *flags |= V4L2_CTRL_FLAG_MODIFY_LAYOUT;
1136 break;
1137 case V4L2_CID_MPEG_VIDEO_MV_H_SEARCH_RANGE:
1138 case V4L2_CID_MPEG_VIDEO_MV_V_SEARCH_RANGE:
1139 *type = V4L2_CTRL_TYPE_INTEGER;
1140 break;
1141 case V4L2_CID_MPEG_VIDEO_FORCE_KEY_FRAME:
1142 case V4L2_CID_PAN_RESET:
1143 case V4L2_CID_TILT_RESET:
1144 case V4L2_CID_FLASH_STROBE:
1145 case V4L2_CID_FLASH_STROBE_STOP:
1146 case V4L2_CID_AUTO_FOCUS_START:
1147 case V4L2_CID_AUTO_FOCUS_STOP:
1148 *type = V4L2_CTRL_TYPE_BUTTON;
1149 *flags |= V4L2_CTRL_FLAG_WRITE_ONLY |
1150 V4L2_CTRL_FLAG_EXECUTE_ON_WRITE;
1151 *min = *max = *step = *def = 0;
1152 break;
1153 case V4L2_CID_POWER_LINE_FREQUENCY:
1154 case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ:
1155 case V4L2_CID_MPEG_AUDIO_ENCODING:
1156 case V4L2_CID_MPEG_AUDIO_L1_BITRATE:
1157 case V4L2_CID_MPEG_AUDIO_L2_BITRATE:
1158 case V4L2_CID_MPEG_AUDIO_L3_BITRATE:
1159 case V4L2_CID_MPEG_AUDIO_AC3_BITRATE:
1160 case V4L2_CID_MPEG_AUDIO_MODE:
1161 case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION:
1162 case V4L2_CID_MPEG_AUDIO_EMPHASIS:
1163 case V4L2_CID_MPEG_AUDIO_CRC:
1164 case V4L2_CID_MPEG_AUDIO_DEC_PLAYBACK:
1165 case V4L2_CID_MPEG_AUDIO_DEC_MULTILINGUAL_PLAYBACK:
1166 case V4L2_CID_MPEG_VIDEO_ENCODING:
1167 case V4L2_CID_MPEG_VIDEO_ASPECT:
1168 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
1169 case V4L2_CID_MPEG_STREAM_TYPE:
1170 case V4L2_CID_MPEG_STREAM_VBI_FMT:
1171 case V4L2_CID_EXPOSURE_AUTO:
1172 case V4L2_CID_AUTO_FOCUS_RANGE:
1173 case V4L2_CID_COLORFX:
1174 case V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE:
1175 case V4L2_CID_TUNE_PREEMPHASIS:
1176 case V4L2_CID_FLASH_LED_MODE:
1177 case V4L2_CID_FLASH_STROBE_SOURCE:
1178 case V4L2_CID_MPEG_VIDEO_HEADER_MODE:
1179 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE:
1180 case V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE:
1181 case V4L2_CID_MPEG_VIDEO_H264_LEVEL:
1182 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE:
1183 case V4L2_CID_MPEG_VIDEO_H264_PROFILE:
1184 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC:
1185 case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE:
1186 case V4L2_CID_MPEG_VIDEO_H264_FMO_MAP_TYPE:
1187 case V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL:
1188 case V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE:
1189 case V4L2_CID_JPEG_CHROMA_SUBSAMPLING:
1190 case V4L2_CID_ISO_SENSITIVITY_AUTO:
1191 case V4L2_CID_EXPOSURE_METERING:
1192 case V4L2_CID_SCENE_MODE:
1193 case V4L2_CID_DV_TX_MODE:
1194 case V4L2_CID_DV_TX_RGB_RANGE:
1195 case V4L2_CID_DV_TX_IT_CONTENT_TYPE:
1196 case V4L2_CID_DV_RX_RGB_RANGE:
1197 case V4L2_CID_DV_RX_IT_CONTENT_TYPE:
1198 case V4L2_CID_TEST_PATTERN:
1199 case V4L2_CID_DEINTERLACING_MODE:
1200 case V4L2_CID_TUNE_DEEMPHASIS:
1201 case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_SEL:
1202 case V4L2_CID_MPEG_VIDEO_VP8_PROFILE:
1203 case V4L2_CID_MPEG_VIDEO_VP9_PROFILE:
1204 case V4L2_CID_DETECT_MD_MODE:
1205 case V4L2_CID_MPEG_VIDEO_HEVC_PROFILE:
1206 case V4L2_CID_MPEG_VIDEO_HEVC_LEVEL:
1207 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_TYPE:
1208 case V4L2_CID_MPEG_VIDEO_HEVC_REFRESH_TYPE:
1209 case V4L2_CID_MPEG_VIDEO_HEVC_SIZE_OF_LENGTH_FIELD:
1210 case V4L2_CID_MPEG_VIDEO_HEVC_TIER:
1211 case V4L2_CID_MPEG_VIDEO_HEVC_LOOP_FILTER_MODE:
1212 *type = V4L2_CTRL_TYPE_MENU;
1213 break;
1214 case V4L2_CID_LINK_FREQ:
1215 *type = V4L2_CTRL_TYPE_INTEGER_MENU;
1216 break;
1217 case V4L2_CID_RDS_TX_PS_NAME:
1218 case V4L2_CID_RDS_TX_RADIO_TEXT:
1219 case V4L2_CID_RDS_RX_PS_NAME:
1220 case V4L2_CID_RDS_RX_RADIO_TEXT:
1221 *type = V4L2_CTRL_TYPE_STRING;
1222 break;
1223 case V4L2_CID_ISO_SENSITIVITY:
1224 case V4L2_CID_AUTO_EXPOSURE_BIAS:
1225 case V4L2_CID_MPEG_VIDEO_VPX_NUM_PARTITIONS:
1226 case V4L2_CID_MPEG_VIDEO_VPX_NUM_REF_FRAMES:
1227 *type = V4L2_CTRL_TYPE_INTEGER_MENU;
1228 break;
1229 case V4L2_CID_USER_CLASS:
1230 case V4L2_CID_CAMERA_CLASS:
1231 case V4L2_CID_MPEG_CLASS:
1232 case V4L2_CID_FM_TX_CLASS:
1233 case V4L2_CID_FLASH_CLASS:
1234 case V4L2_CID_JPEG_CLASS:
1235 case V4L2_CID_IMAGE_SOURCE_CLASS:
1236 case V4L2_CID_IMAGE_PROC_CLASS:
1237 case V4L2_CID_DV_CLASS:
1238 case V4L2_CID_FM_RX_CLASS:
1239 case V4L2_CID_RF_TUNER_CLASS:
1240 case V4L2_CID_DETECT_CLASS:
1241 *type = V4L2_CTRL_TYPE_CTRL_CLASS;
1242 /* You can neither read not write these */
1243 *flags |= V4L2_CTRL_FLAG_READ_ONLY | V4L2_CTRL_FLAG_WRITE_ONLY;
1244 *min = *max = *step = *def = 0;
1245 break;
1246 case V4L2_CID_BG_COLOR:
1247 *type = V4L2_CTRL_TYPE_INTEGER;
1248 *step = 1;
1249 *min = 0;
1250 /* Max is calculated as RGB888 that is 2^24 */
1251 *max = 0xFFFFFF;
1252 break;
1253 case V4L2_CID_FLASH_FAULT:
1254 case V4L2_CID_JPEG_ACTIVE_MARKER:
1255 case V4L2_CID_3A_LOCK:
1256 case V4L2_CID_AUTO_FOCUS_STATUS:
1257 case V4L2_CID_DV_TX_HOTPLUG:
1258 case V4L2_CID_DV_TX_RXSENSE:
1259 case V4L2_CID_DV_TX_EDID_PRESENT:
1260 case V4L2_CID_DV_RX_POWER_PRESENT:
1261 *type = V4L2_CTRL_TYPE_BITMASK;
1262 break;
1263 case V4L2_CID_MIN_BUFFERS_FOR_CAPTURE:
1264 case V4L2_CID_MIN_BUFFERS_FOR_OUTPUT:
1265 *type = V4L2_CTRL_TYPE_INTEGER;
1266 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
1267 break;
1268 case V4L2_CID_MPEG_VIDEO_DEC_PTS:
1269 *type = V4L2_CTRL_TYPE_INTEGER64;
1270 *flags |= V4L2_CTRL_FLAG_VOLATILE | V4L2_CTRL_FLAG_READ_ONLY;
1271 *min = *def = 0;
1272 *max = 0x1ffffffffLL;
1273 *step = 1;
1274 break;
1275 case V4L2_CID_MPEG_VIDEO_DEC_FRAME:
1276 *type = V4L2_CTRL_TYPE_INTEGER64;
1277 *flags |= V4L2_CTRL_FLAG_VOLATILE | V4L2_CTRL_FLAG_READ_ONLY;
1278 *min = *def = 0;
1279 *max = 0x7fffffffffffffffLL;
1280 *step = 1;
1281 break;
1282 case V4L2_CID_PIXEL_RATE:
1283 *type = V4L2_CTRL_TYPE_INTEGER64;
1284 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
1285 break;
1286 case V4L2_CID_DETECT_MD_REGION_GRID:
1287 *type = V4L2_CTRL_TYPE_U8;
1288 break;
1289 case V4L2_CID_DETECT_MD_THRESHOLD_GRID:
1290 *type = V4L2_CTRL_TYPE_U16;
1291 break;
1292 case V4L2_CID_RDS_TX_ALT_FREQS:
1293 *type = V4L2_CTRL_TYPE_U32;
1294 break;
1295 default:
1296 *type = V4L2_CTRL_TYPE_INTEGER;
1297 break;
1298 }
1299 switch (id) {
1300 case V4L2_CID_MPEG_AUDIO_ENCODING:
1301 case V4L2_CID_MPEG_AUDIO_MODE:
1302 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
1303 case V4L2_CID_MPEG_VIDEO_B_FRAMES:
1304 case V4L2_CID_MPEG_STREAM_TYPE:
1305 *flags |= V4L2_CTRL_FLAG_UPDATE;
1306 break;
1307 case V4L2_CID_AUDIO_VOLUME:
1308 case V4L2_CID_AUDIO_BALANCE:
1309 case V4L2_CID_AUDIO_BASS:
1310 case V4L2_CID_AUDIO_TREBLE:
1311 case V4L2_CID_BRIGHTNESS:
1312 case V4L2_CID_CONTRAST:
1313 case V4L2_CID_SATURATION:
1314 case V4L2_CID_HUE:
1315 case V4L2_CID_RED_BALANCE:
1316 case V4L2_CID_BLUE_BALANCE:
1317 case V4L2_CID_GAMMA:
1318 case V4L2_CID_SHARPNESS:
1319 case V4L2_CID_CHROMA_GAIN:
1320 case V4L2_CID_RDS_TX_DEVIATION:
1321 case V4L2_CID_AUDIO_LIMITER_RELEASE_TIME:
1322 case V4L2_CID_AUDIO_LIMITER_DEVIATION:
1323 case V4L2_CID_AUDIO_COMPRESSION_GAIN:
1324 case V4L2_CID_AUDIO_COMPRESSION_THRESHOLD:
1325 case V4L2_CID_AUDIO_COMPRESSION_ATTACK_TIME:
1326 case V4L2_CID_AUDIO_COMPRESSION_RELEASE_TIME:
1327 case V4L2_CID_PILOT_TONE_DEVIATION:
1328 case V4L2_CID_PILOT_TONE_FREQUENCY:
1329 case V4L2_CID_TUNE_POWER_LEVEL:
1330 case V4L2_CID_TUNE_ANTENNA_CAPACITOR:
1331 case V4L2_CID_RF_TUNER_RF_GAIN:
1332 case V4L2_CID_RF_TUNER_LNA_GAIN:
1333 case V4L2_CID_RF_TUNER_MIXER_GAIN:
1334 case V4L2_CID_RF_TUNER_IF_GAIN:
1335 case V4L2_CID_RF_TUNER_BANDWIDTH:
1336 case V4L2_CID_DETECT_MD_GLOBAL_THRESHOLD:
1337 *flags |= V4L2_CTRL_FLAG_SLIDER;
1338 break;
1339 case V4L2_CID_PAN_RELATIVE:
1340 case V4L2_CID_TILT_RELATIVE:
1341 case V4L2_CID_FOCUS_RELATIVE:
1342 case V4L2_CID_IRIS_RELATIVE:
1343 case V4L2_CID_ZOOM_RELATIVE:
1344 *flags |= V4L2_CTRL_FLAG_WRITE_ONLY |
1345 V4L2_CTRL_FLAG_EXECUTE_ON_WRITE;
1346 break;
1347 case V4L2_CID_FLASH_STROBE_STATUS:
1348 case V4L2_CID_AUTO_FOCUS_STATUS:
1349 case V4L2_CID_FLASH_READY:
1350 case V4L2_CID_DV_TX_HOTPLUG:
1351 case V4L2_CID_DV_TX_RXSENSE:
1352 case V4L2_CID_DV_TX_EDID_PRESENT:
1353 case V4L2_CID_DV_RX_POWER_PRESENT:
1354 case V4L2_CID_DV_RX_IT_CONTENT_TYPE:
1355 case V4L2_CID_RDS_RX_PTY:
1356 case V4L2_CID_RDS_RX_PS_NAME:
1357 case V4L2_CID_RDS_RX_RADIO_TEXT:
1358 case V4L2_CID_RDS_RX_TRAFFIC_ANNOUNCEMENT:
1359 case V4L2_CID_RDS_RX_TRAFFIC_PROGRAM:
1360 case V4L2_CID_RDS_RX_MUSIC_SPEECH:
1361 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
1362 break;
1363 case V4L2_CID_RF_TUNER_PLL_LOCK:
1364 *flags |= V4L2_CTRL_FLAG_VOLATILE;
1365 break;
1366 }
1367 }
1368 EXPORT_SYMBOL(v4l2_ctrl_fill);
1369
user_flags(const struct v4l2_ctrl * ctrl)1370 static u32 user_flags(const struct v4l2_ctrl *ctrl)
1371 {
1372 u32 flags = ctrl->flags;
1373
1374 if (ctrl->is_ptr)
1375 flags |= V4L2_CTRL_FLAG_HAS_PAYLOAD;
1376
1377 return flags;
1378 }
1379
fill_event(struct v4l2_event * ev,struct v4l2_ctrl * ctrl,u32 changes)1380 static void fill_event(struct v4l2_event *ev, struct v4l2_ctrl *ctrl, u32 changes)
1381 {
1382 memset(ev->reserved, 0, sizeof(ev->reserved));
1383 ev->type = V4L2_EVENT_CTRL;
1384 ev->id = ctrl->id;
1385 ev->u.ctrl.changes = changes;
1386 ev->u.ctrl.type = ctrl->type;
1387 ev->u.ctrl.flags = user_flags(ctrl);
1388 if (ctrl->is_ptr)
1389 ev->u.ctrl.value64 = 0;
1390 else
1391 ev->u.ctrl.value64 = *ctrl->p_cur.p_s64;
1392 ev->u.ctrl.minimum = ctrl->minimum;
1393 ev->u.ctrl.maximum = ctrl->maximum;
1394 if (ctrl->type == V4L2_CTRL_TYPE_MENU
1395 || ctrl->type == V4L2_CTRL_TYPE_INTEGER_MENU)
1396 ev->u.ctrl.step = 1;
1397 else
1398 ev->u.ctrl.step = ctrl->step;
1399 ev->u.ctrl.default_value = ctrl->default_value;
1400 }
1401
send_event(struct v4l2_fh * fh,struct v4l2_ctrl * ctrl,u32 changes)1402 static void send_event(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, u32 changes)
1403 {
1404 struct v4l2_event ev;
1405 struct v4l2_subscribed_event *sev;
1406
1407 if (list_empty(&ctrl->ev_subs))
1408 return;
1409 fill_event(&ev, ctrl, changes);
1410
1411 list_for_each_entry(sev, &ctrl->ev_subs, node)
1412 if (sev->fh != fh ||
1413 (sev->flags & V4L2_EVENT_SUB_FL_ALLOW_FEEDBACK))
1414 v4l2_event_queue_fh(sev->fh, &ev);
1415 }
1416
std_equal(const struct v4l2_ctrl * ctrl,u32 idx,union v4l2_ctrl_ptr ptr1,union v4l2_ctrl_ptr ptr2)1417 static bool std_equal(const struct v4l2_ctrl *ctrl, u32 idx,
1418 union v4l2_ctrl_ptr ptr1,
1419 union v4l2_ctrl_ptr ptr2)
1420 {
1421 switch (ctrl->type) {
1422 case V4L2_CTRL_TYPE_BUTTON:
1423 return false;
1424 case V4L2_CTRL_TYPE_STRING:
1425 idx *= ctrl->elem_size;
1426 /* strings are always 0-terminated */
1427 return !strcmp(ptr1.p_char + idx, ptr2.p_char + idx);
1428 case V4L2_CTRL_TYPE_INTEGER64:
1429 return ptr1.p_s64[idx] == ptr2.p_s64[idx];
1430 case V4L2_CTRL_TYPE_U8:
1431 return ptr1.p_u8[idx] == ptr2.p_u8[idx];
1432 case V4L2_CTRL_TYPE_U16:
1433 return ptr1.p_u16[idx] == ptr2.p_u16[idx];
1434 case V4L2_CTRL_TYPE_U32:
1435 return ptr1.p_u32[idx] == ptr2.p_u32[idx];
1436 default:
1437 if (ctrl->is_int)
1438 return ptr1.p_s32[idx] == ptr2.p_s32[idx];
1439 idx *= ctrl->elem_size;
1440 return !memcmp(ptr1.p + idx, ptr2.p + idx, ctrl->elem_size);
1441 }
1442 }
1443
std_init(const struct v4l2_ctrl * ctrl,u32 idx,union v4l2_ctrl_ptr ptr)1444 static void std_init(const struct v4l2_ctrl *ctrl, u32 idx,
1445 union v4l2_ctrl_ptr ptr)
1446 {
1447 switch (ctrl->type) {
1448 case V4L2_CTRL_TYPE_STRING:
1449 idx *= ctrl->elem_size;
1450 memset(ptr.p_char + idx, ' ', ctrl->minimum);
1451 ptr.p_char[idx + ctrl->minimum] = '\0';
1452 break;
1453 case V4L2_CTRL_TYPE_INTEGER64:
1454 ptr.p_s64[idx] = ctrl->default_value;
1455 break;
1456 case V4L2_CTRL_TYPE_INTEGER:
1457 case V4L2_CTRL_TYPE_INTEGER_MENU:
1458 case V4L2_CTRL_TYPE_MENU:
1459 case V4L2_CTRL_TYPE_BITMASK:
1460 case V4L2_CTRL_TYPE_BOOLEAN:
1461 ptr.p_s32[idx] = ctrl->default_value;
1462 break;
1463 case V4L2_CTRL_TYPE_U8:
1464 ptr.p_u8[idx] = ctrl->default_value;
1465 break;
1466 case V4L2_CTRL_TYPE_U16:
1467 ptr.p_u16[idx] = ctrl->default_value;
1468 break;
1469 case V4L2_CTRL_TYPE_U32:
1470 ptr.p_u32[idx] = ctrl->default_value;
1471 break;
1472 default:
1473 idx *= ctrl->elem_size;
1474 memset(ptr.p + idx, 0, ctrl->elem_size);
1475 break;
1476 }
1477 }
1478
std_log(const struct v4l2_ctrl * ctrl)1479 static void std_log(const struct v4l2_ctrl *ctrl)
1480 {
1481 union v4l2_ctrl_ptr ptr = ctrl->p_cur;
1482
1483 if (ctrl->is_array) {
1484 unsigned i;
1485
1486 for (i = 0; i < ctrl->nr_of_dims; i++)
1487 pr_cont("[%u]", ctrl->dims[i]);
1488 pr_cont(" ");
1489 }
1490
1491 switch (ctrl->type) {
1492 case V4L2_CTRL_TYPE_INTEGER:
1493 pr_cont("%d", *ptr.p_s32);
1494 break;
1495 case V4L2_CTRL_TYPE_BOOLEAN:
1496 pr_cont("%s", *ptr.p_s32 ? "true" : "false");
1497 break;
1498 case V4L2_CTRL_TYPE_MENU:
1499 pr_cont("%s", ctrl->qmenu[*ptr.p_s32]);
1500 break;
1501 case V4L2_CTRL_TYPE_INTEGER_MENU:
1502 pr_cont("%lld", ctrl->qmenu_int[*ptr.p_s32]);
1503 break;
1504 case V4L2_CTRL_TYPE_BITMASK:
1505 pr_cont("0x%08x", *ptr.p_s32);
1506 break;
1507 case V4L2_CTRL_TYPE_INTEGER64:
1508 pr_cont("%lld", *ptr.p_s64);
1509 break;
1510 case V4L2_CTRL_TYPE_STRING:
1511 pr_cont("%s", ptr.p_char);
1512 break;
1513 case V4L2_CTRL_TYPE_U8:
1514 pr_cont("%u", (unsigned)*ptr.p_u8);
1515 break;
1516 case V4L2_CTRL_TYPE_U16:
1517 pr_cont("%u", (unsigned)*ptr.p_u16);
1518 break;
1519 case V4L2_CTRL_TYPE_U32:
1520 pr_cont("%u", (unsigned)*ptr.p_u32);
1521 break;
1522 default:
1523 pr_cont("unknown type %d", ctrl->type);
1524 break;
1525 }
1526 }
1527
1528 /*
1529 * Round towards the closest legal value. Be careful when we are
1530 * close to the maximum range of the control type to prevent
1531 * wrap-arounds.
1532 */
1533 #define ROUND_TO_RANGE(val, offset_type, ctrl) \
1534 ({ \
1535 offset_type offset; \
1536 if ((ctrl)->maximum >= 0 && \
1537 val >= (ctrl)->maximum - (s32)((ctrl)->step / 2)) \
1538 val = (ctrl)->maximum; \
1539 else \
1540 val += (s32)((ctrl)->step / 2); \
1541 val = clamp_t(typeof(val), val, \
1542 (ctrl)->minimum, (ctrl)->maximum); \
1543 offset = (val) - (ctrl)->minimum; \
1544 offset = (ctrl)->step * (offset / (u32)(ctrl)->step); \
1545 val = (ctrl)->minimum + offset; \
1546 0; \
1547 })
1548
1549 /* Validate a new control */
std_validate(const struct v4l2_ctrl * ctrl,u32 idx,union v4l2_ctrl_ptr ptr)1550 static int std_validate(const struct v4l2_ctrl *ctrl, u32 idx,
1551 union v4l2_ctrl_ptr ptr)
1552 {
1553 size_t len;
1554 u64 offset;
1555 s64 val;
1556
1557 switch (ctrl->type) {
1558 case V4L2_CTRL_TYPE_INTEGER:
1559 return ROUND_TO_RANGE(ptr.p_s32[idx], u32, ctrl);
1560 case V4L2_CTRL_TYPE_INTEGER64:
1561 /*
1562 * We can't use the ROUND_TO_RANGE define here due to
1563 * the u64 divide that needs special care.
1564 */
1565 val = ptr.p_s64[idx];
1566 if (ctrl->maximum >= 0 && val >= ctrl->maximum - (s64)(ctrl->step / 2))
1567 val = ctrl->maximum;
1568 else
1569 val += (s64)(ctrl->step / 2);
1570 val = clamp_t(s64, val, ctrl->minimum, ctrl->maximum);
1571 offset = val - ctrl->minimum;
1572 do_div(offset, ctrl->step);
1573 ptr.p_s64[idx] = ctrl->minimum + offset * ctrl->step;
1574 return 0;
1575 case V4L2_CTRL_TYPE_U8:
1576 return ROUND_TO_RANGE(ptr.p_u8[idx], u8, ctrl);
1577 case V4L2_CTRL_TYPE_U16:
1578 return ROUND_TO_RANGE(ptr.p_u16[idx], u16, ctrl);
1579 case V4L2_CTRL_TYPE_U32:
1580 return ROUND_TO_RANGE(ptr.p_u32[idx], u32, ctrl);
1581
1582 case V4L2_CTRL_TYPE_BOOLEAN:
1583 ptr.p_s32[idx] = !!ptr.p_s32[idx];
1584 return 0;
1585
1586 case V4L2_CTRL_TYPE_MENU:
1587 case V4L2_CTRL_TYPE_INTEGER_MENU:
1588 if (ptr.p_s32[idx] < ctrl->minimum || ptr.p_s32[idx] > ctrl->maximum)
1589 return -ERANGE;
1590 if (ctrl->menu_skip_mask & (1 << ptr.p_s32[idx]))
1591 return -EINVAL;
1592 if (ctrl->type == V4L2_CTRL_TYPE_MENU &&
1593 ctrl->qmenu[ptr.p_s32[idx]][0] == '\0')
1594 return -EINVAL;
1595 return 0;
1596
1597 case V4L2_CTRL_TYPE_BITMASK:
1598 ptr.p_s32[idx] &= ctrl->maximum;
1599 return 0;
1600
1601 case V4L2_CTRL_TYPE_BUTTON:
1602 case V4L2_CTRL_TYPE_CTRL_CLASS:
1603 ptr.p_s32[idx] = 0;
1604 return 0;
1605
1606 case V4L2_CTRL_TYPE_STRING:
1607 idx *= ctrl->elem_size;
1608 len = strlen(ptr.p_char + idx);
1609 if (len < ctrl->minimum)
1610 return -ERANGE;
1611 if ((len - (u32)ctrl->minimum) % (u32)ctrl->step)
1612 return -ERANGE;
1613 return 0;
1614
1615 default:
1616 return -EINVAL;
1617 }
1618 }
1619
1620 static const struct v4l2_ctrl_type_ops std_type_ops = {
1621 .equal = std_equal,
1622 .init = std_init,
1623 .log = std_log,
1624 .validate = std_validate,
1625 };
1626
1627 /* 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)1628 static int ptr_to_user(struct v4l2_ext_control *c,
1629 struct v4l2_ctrl *ctrl,
1630 union v4l2_ctrl_ptr ptr)
1631 {
1632 u32 len;
1633
1634 if (ctrl->is_ptr && !ctrl->is_string)
1635 return copy_to_user(c->ptr, ptr.p, c->size) ?
1636 -EFAULT : 0;
1637
1638 switch (ctrl->type) {
1639 case V4L2_CTRL_TYPE_STRING:
1640 len = strlen(ptr.p_char);
1641 if (c->size < len + 1) {
1642 c->size = ctrl->elem_size;
1643 return -ENOSPC;
1644 }
1645 return copy_to_user(c->string, ptr.p_char, len + 1) ?
1646 -EFAULT : 0;
1647 case V4L2_CTRL_TYPE_INTEGER64:
1648 c->value64 = *ptr.p_s64;
1649 break;
1650 default:
1651 c->value = *ptr.p_s32;
1652 break;
1653 }
1654 return 0;
1655 }
1656
1657 /* Helper function: copy the current control value back to the caller */
cur_to_user(struct v4l2_ext_control * c,struct v4l2_ctrl * ctrl)1658 static int cur_to_user(struct v4l2_ext_control *c,
1659 struct v4l2_ctrl *ctrl)
1660 {
1661 return ptr_to_user(c, ctrl, ctrl->p_cur);
1662 }
1663
1664 /* Helper function: copy the new control value back to the caller */
new_to_user(struct v4l2_ext_control * c,struct v4l2_ctrl * ctrl)1665 static int new_to_user(struct v4l2_ext_control *c,
1666 struct v4l2_ctrl *ctrl)
1667 {
1668 return ptr_to_user(c, ctrl, ctrl->p_new);
1669 }
1670
1671 /* Helper function: copy the initial control value back to the caller */
def_to_user(struct v4l2_ext_control * c,struct v4l2_ctrl * ctrl)1672 static int def_to_user(struct v4l2_ext_control *c, struct v4l2_ctrl *ctrl)
1673 {
1674 int idx;
1675
1676 for (idx = 0; idx < ctrl->elems; idx++)
1677 ctrl->type_ops->init(ctrl, idx, ctrl->p_new);
1678
1679 return ptr_to_user(c, ctrl, ctrl->p_new);
1680 }
1681
1682 /* 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)1683 static int user_to_ptr(struct v4l2_ext_control *c,
1684 struct v4l2_ctrl *ctrl,
1685 union v4l2_ctrl_ptr ptr)
1686 {
1687 int ret;
1688 u32 size;
1689
1690 ctrl->is_new = 1;
1691 if (ctrl->is_ptr && !ctrl->is_string) {
1692 unsigned idx;
1693
1694 ret = copy_from_user(ptr.p, c->ptr, c->size) ? -EFAULT : 0;
1695 if (ret || !ctrl->is_array)
1696 return ret;
1697 for (idx = c->size / ctrl->elem_size; idx < ctrl->elems; idx++)
1698 ctrl->type_ops->init(ctrl, idx, ptr);
1699 return 0;
1700 }
1701
1702 switch (ctrl->type) {
1703 case V4L2_CTRL_TYPE_INTEGER64:
1704 *ptr.p_s64 = c->value64;
1705 break;
1706 case V4L2_CTRL_TYPE_STRING:
1707 size = c->size;
1708 if (size == 0)
1709 return -ERANGE;
1710 if (size > ctrl->maximum + 1)
1711 size = ctrl->maximum + 1;
1712 ret = copy_from_user(ptr.p_char, c->string, size) ? -EFAULT : 0;
1713 if (!ret) {
1714 char last = ptr.p_char[size - 1];
1715
1716 ptr.p_char[size - 1] = 0;
1717 /* If the string was longer than ctrl->maximum,
1718 then return an error. */
1719 if (strlen(ptr.p_char) == ctrl->maximum && last)
1720 return -ERANGE;
1721 }
1722 return ret;
1723 default:
1724 *ptr.p_s32 = c->value;
1725 break;
1726 }
1727 return 0;
1728 }
1729
1730 /* Helper function: copy the caller-provider value as the new control value */
user_to_new(struct v4l2_ext_control * c,struct v4l2_ctrl * ctrl)1731 static int user_to_new(struct v4l2_ext_control *c,
1732 struct v4l2_ctrl *ctrl)
1733 {
1734 return user_to_ptr(c, ctrl, ctrl->p_new);
1735 }
1736
1737 /* Copy the one value to another. */
ptr_to_ptr(struct v4l2_ctrl * ctrl,union v4l2_ctrl_ptr from,union v4l2_ctrl_ptr to)1738 static void ptr_to_ptr(struct v4l2_ctrl *ctrl,
1739 union v4l2_ctrl_ptr from, union v4l2_ctrl_ptr to)
1740 {
1741 if (ctrl == NULL)
1742 return;
1743 memcpy(to.p, from.p, ctrl->elems * ctrl->elem_size);
1744 }
1745
1746 /* Copy the new value to the current value. */
new_to_cur(struct v4l2_fh * fh,struct v4l2_ctrl * ctrl,u32 ch_flags)1747 static void new_to_cur(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, u32 ch_flags)
1748 {
1749 bool changed;
1750
1751 if (ctrl == NULL)
1752 return;
1753
1754 /* has_changed is set by cluster_changed */
1755 changed = ctrl->has_changed;
1756 if (changed)
1757 ptr_to_ptr(ctrl, ctrl->p_new, ctrl->p_cur);
1758
1759 if (ch_flags & V4L2_EVENT_CTRL_CH_FLAGS) {
1760 /* Note: CH_FLAGS is only set for auto clusters. */
1761 ctrl->flags &=
1762 ~(V4L2_CTRL_FLAG_INACTIVE | V4L2_CTRL_FLAG_VOLATILE);
1763 if (!is_cur_manual(ctrl->cluster[0])) {
1764 ctrl->flags |= V4L2_CTRL_FLAG_INACTIVE;
1765 if (ctrl->cluster[0]->has_volatiles)
1766 ctrl->flags |= V4L2_CTRL_FLAG_VOLATILE;
1767 }
1768 fh = NULL;
1769 }
1770 if (changed || ch_flags) {
1771 /* If a control was changed that was not one of the controls
1772 modified by the application, then send the event to all. */
1773 if (!ctrl->is_new)
1774 fh = NULL;
1775 send_event(fh, ctrl,
1776 (changed ? V4L2_EVENT_CTRL_CH_VALUE : 0) | ch_flags);
1777 if (ctrl->call_notify && changed && ctrl->handler->notify)
1778 ctrl->handler->notify(ctrl, ctrl->handler->notify_priv);
1779 }
1780 }
1781
1782 /* Copy the current value to the new value */
cur_to_new(struct v4l2_ctrl * ctrl)1783 static void cur_to_new(struct v4l2_ctrl *ctrl)
1784 {
1785 if (ctrl == NULL)
1786 return;
1787 ptr_to_ptr(ctrl, ctrl->p_cur, ctrl->p_new);
1788 }
1789
1790 /* Return non-zero if one or more of the controls in the cluster has a new
1791 value that differs from the current value. */
cluster_changed(struct v4l2_ctrl * master)1792 static int cluster_changed(struct v4l2_ctrl *master)
1793 {
1794 bool changed = false;
1795 unsigned idx;
1796 int i;
1797
1798 for (i = 0; i < master->ncontrols; i++) {
1799 struct v4l2_ctrl *ctrl = master->cluster[i];
1800 bool ctrl_changed = false;
1801
1802 if (ctrl == NULL)
1803 continue;
1804
1805 if (ctrl->flags & V4L2_CTRL_FLAG_EXECUTE_ON_WRITE)
1806 changed = ctrl_changed = true;
1807
1808 /*
1809 * Set has_changed to false to avoid generating
1810 * the event V4L2_EVENT_CTRL_CH_VALUE
1811 */
1812 if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE) {
1813 ctrl->has_changed = false;
1814 continue;
1815 }
1816
1817 for (idx = 0; !ctrl_changed && idx < ctrl->elems; idx++)
1818 ctrl_changed = !ctrl->type_ops->equal(ctrl, idx,
1819 ctrl->p_cur, ctrl->p_new);
1820 ctrl->has_changed = ctrl_changed;
1821 changed |= ctrl->has_changed;
1822 }
1823 return changed;
1824 }
1825
1826 /* Control range checking */
check_range(enum v4l2_ctrl_type type,s64 min,s64 max,u64 step,s64 def)1827 static int check_range(enum v4l2_ctrl_type type,
1828 s64 min, s64 max, u64 step, s64 def)
1829 {
1830 switch (type) {
1831 case V4L2_CTRL_TYPE_BOOLEAN:
1832 if (step != 1 || max > 1 || min < 0)
1833 return -ERANGE;
1834 /* fall through */
1835 case V4L2_CTRL_TYPE_U8:
1836 case V4L2_CTRL_TYPE_U16:
1837 case V4L2_CTRL_TYPE_U32:
1838 case V4L2_CTRL_TYPE_INTEGER:
1839 case V4L2_CTRL_TYPE_INTEGER64:
1840 if (step == 0 || min > max || def < min || def > max)
1841 return -ERANGE;
1842 return 0;
1843 case V4L2_CTRL_TYPE_BITMASK:
1844 if (step || min || !max || (def & ~max))
1845 return -ERANGE;
1846 return 0;
1847 case V4L2_CTRL_TYPE_MENU:
1848 case V4L2_CTRL_TYPE_INTEGER_MENU:
1849 if (min > max || def < min || def > max)
1850 return -ERANGE;
1851 /* Note: step == menu_skip_mask for menu controls.
1852 So here we check if the default value is masked out. */
1853 if (step && ((1 << def) & step))
1854 return -EINVAL;
1855 return 0;
1856 case V4L2_CTRL_TYPE_STRING:
1857 if (min > max || min < 0 || step < 1 || def)
1858 return -ERANGE;
1859 return 0;
1860 default:
1861 return 0;
1862 }
1863 }
1864
1865 /* Validate a new control */
validate_new(const struct v4l2_ctrl * ctrl,union v4l2_ctrl_ptr p_new)1866 static int validate_new(const struct v4l2_ctrl *ctrl, union v4l2_ctrl_ptr p_new)
1867 {
1868 unsigned idx;
1869 int err = 0;
1870
1871 for (idx = 0; !err && idx < ctrl->elems; idx++)
1872 err = ctrl->type_ops->validate(ctrl, idx, p_new);
1873 return err;
1874 }
1875
node2id(struct list_head * node)1876 static inline u32 node2id(struct list_head *node)
1877 {
1878 return list_entry(node, struct v4l2_ctrl_ref, node)->ctrl->id;
1879 }
1880
1881 /* Set the handler's error code if it wasn't set earlier already */
handler_set_err(struct v4l2_ctrl_handler * hdl,int err)1882 static inline int handler_set_err(struct v4l2_ctrl_handler *hdl, int err)
1883 {
1884 if (hdl->error == 0)
1885 hdl->error = err;
1886 return err;
1887 }
1888
1889 /* 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)1890 int v4l2_ctrl_handler_init_class(struct v4l2_ctrl_handler *hdl,
1891 unsigned nr_of_controls_hint,
1892 struct lock_class_key *key, const char *name)
1893 {
1894 mutex_init(&hdl->_lock);
1895 hdl->lock = &hdl->_lock;
1896 lockdep_set_class_and_name(hdl->lock, key, name);
1897 INIT_LIST_HEAD(&hdl->ctrls);
1898 INIT_LIST_HEAD(&hdl->ctrl_refs);
1899 hdl->nr_of_buckets = 1 + nr_of_controls_hint / 8;
1900 hdl->buckets = kvmalloc_array(hdl->nr_of_buckets,
1901 sizeof(hdl->buckets[0]),
1902 GFP_KERNEL | __GFP_ZERO);
1903 hdl->error = hdl->buckets ? 0 : -ENOMEM;
1904 return hdl->error;
1905 }
1906 EXPORT_SYMBOL(v4l2_ctrl_handler_init_class);
1907
1908 /* Free all controls and control refs */
v4l2_ctrl_handler_free(struct v4l2_ctrl_handler * hdl)1909 void v4l2_ctrl_handler_free(struct v4l2_ctrl_handler *hdl)
1910 {
1911 struct v4l2_ctrl_ref *ref, *next_ref;
1912 struct v4l2_ctrl *ctrl, *next_ctrl;
1913 struct v4l2_subscribed_event *sev, *next_sev;
1914
1915 if (hdl == NULL || hdl->buckets == NULL)
1916 return;
1917
1918 mutex_lock(hdl->lock);
1919 /* Free all nodes */
1920 list_for_each_entry_safe(ref, next_ref, &hdl->ctrl_refs, node) {
1921 list_del(&ref->node);
1922 kfree(ref);
1923 }
1924 /* Free all controls owned by the handler */
1925 list_for_each_entry_safe(ctrl, next_ctrl, &hdl->ctrls, node) {
1926 list_del(&ctrl->node);
1927 list_for_each_entry_safe(sev, next_sev, &ctrl->ev_subs, node)
1928 list_del(&sev->node);
1929 kvfree(ctrl);
1930 }
1931 kvfree(hdl->buckets);
1932 hdl->buckets = NULL;
1933 hdl->cached = NULL;
1934 hdl->error = 0;
1935 mutex_unlock(hdl->lock);
1936 mutex_destroy(&hdl->_lock);
1937 }
1938 EXPORT_SYMBOL(v4l2_ctrl_handler_free);
1939
1940 /* For backwards compatibility: V4L2_CID_PRIVATE_BASE should no longer
1941 be used except in G_CTRL, S_CTRL, QUERYCTRL and QUERYMENU when dealing
1942 with applications that do not use the NEXT_CTRL flag.
1943
1944 We just find the n-th private user control. It's O(N), but that should not
1945 be an issue in this particular case. */
find_private_ref(struct v4l2_ctrl_handler * hdl,u32 id)1946 static struct v4l2_ctrl_ref *find_private_ref(
1947 struct v4l2_ctrl_handler *hdl, u32 id)
1948 {
1949 struct v4l2_ctrl_ref *ref;
1950
1951 id -= V4L2_CID_PRIVATE_BASE;
1952 list_for_each_entry(ref, &hdl->ctrl_refs, node) {
1953 /* Search for private user controls that are compatible with
1954 VIDIOC_G/S_CTRL. */
1955 if (V4L2_CTRL_ID2WHICH(ref->ctrl->id) == V4L2_CTRL_CLASS_USER &&
1956 V4L2_CTRL_DRIVER_PRIV(ref->ctrl->id)) {
1957 if (!ref->ctrl->is_int)
1958 continue;
1959 if (id == 0)
1960 return ref;
1961 id--;
1962 }
1963 }
1964 return NULL;
1965 }
1966
1967 /* Find a control with the given ID. */
find_ref(struct v4l2_ctrl_handler * hdl,u32 id)1968 static struct v4l2_ctrl_ref *find_ref(struct v4l2_ctrl_handler *hdl, u32 id)
1969 {
1970 struct v4l2_ctrl_ref *ref;
1971 int bucket;
1972
1973 id &= V4L2_CTRL_ID_MASK;
1974
1975 /* Old-style private controls need special handling */
1976 if (id >= V4L2_CID_PRIVATE_BASE)
1977 return find_private_ref(hdl, id);
1978 bucket = id % hdl->nr_of_buckets;
1979
1980 /* Simple optimization: cache the last control found */
1981 if (hdl->cached && hdl->cached->ctrl->id == id)
1982 return hdl->cached;
1983
1984 /* Not in cache, search the hash */
1985 ref = hdl->buckets ? hdl->buckets[bucket] : NULL;
1986 while (ref && ref->ctrl->id != id)
1987 ref = ref->next;
1988
1989 if (ref)
1990 hdl->cached = ref; /* cache it! */
1991 return ref;
1992 }
1993
1994 /* Find a control with the given ID. Take the handler's lock first. */
find_ref_lock(struct v4l2_ctrl_handler * hdl,u32 id)1995 static struct v4l2_ctrl_ref *find_ref_lock(
1996 struct v4l2_ctrl_handler *hdl, u32 id)
1997 {
1998 struct v4l2_ctrl_ref *ref = NULL;
1999
2000 if (hdl) {
2001 mutex_lock(hdl->lock);
2002 ref = find_ref(hdl, id);
2003 mutex_unlock(hdl->lock);
2004 }
2005 return ref;
2006 }
2007
2008 /* Find a control with the given ID. */
v4l2_ctrl_find(struct v4l2_ctrl_handler * hdl,u32 id)2009 struct v4l2_ctrl *v4l2_ctrl_find(struct v4l2_ctrl_handler *hdl, u32 id)
2010 {
2011 struct v4l2_ctrl_ref *ref = find_ref_lock(hdl, id);
2012
2013 return ref ? ref->ctrl : NULL;
2014 }
2015 EXPORT_SYMBOL(v4l2_ctrl_find);
2016
2017 /* Allocate a new v4l2_ctrl_ref and hook it into the handler. */
handler_new_ref(struct v4l2_ctrl_handler * hdl,struct v4l2_ctrl * ctrl)2018 static int handler_new_ref(struct v4l2_ctrl_handler *hdl,
2019 struct v4l2_ctrl *ctrl)
2020 {
2021 struct v4l2_ctrl_ref *ref;
2022 struct v4l2_ctrl_ref *new_ref;
2023 u32 id = ctrl->id;
2024 u32 class_ctrl = V4L2_CTRL_ID2WHICH(id) | 1;
2025 int bucket = id % hdl->nr_of_buckets; /* which bucket to use */
2026
2027 /*
2028 * Automatically add the control class if it is not yet present and
2029 * the new control is not a compound control.
2030 */
2031 if (ctrl->type < V4L2_CTRL_COMPOUND_TYPES &&
2032 id != class_ctrl && find_ref_lock(hdl, class_ctrl) == NULL)
2033 if (!v4l2_ctrl_new_std(hdl, NULL, class_ctrl, 0, 0, 0, 0))
2034 return hdl->error;
2035
2036 if (hdl->error)
2037 return hdl->error;
2038
2039 new_ref = kzalloc(sizeof(*new_ref), GFP_KERNEL);
2040 if (!new_ref)
2041 return handler_set_err(hdl, -ENOMEM);
2042 new_ref->ctrl = ctrl;
2043 if (ctrl->handler == hdl) {
2044 /* By default each control starts in a cluster of its own.
2045 new_ref->ctrl is basically a cluster array with one
2046 element, so that's perfect to use as the cluster pointer.
2047 But only do this for the handler that owns the control. */
2048 ctrl->cluster = &new_ref->ctrl;
2049 ctrl->ncontrols = 1;
2050 }
2051
2052 INIT_LIST_HEAD(&new_ref->node);
2053
2054 mutex_lock(hdl->lock);
2055
2056 /* Add immediately at the end of the list if the list is empty, or if
2057 the last element in the list has a lower ID.
2058 This ensures that when elements are added in ascending order the
2059 insertion is an O(1) operation. */
2060 if (list_empty(&hdl->ctrl_refs) || id > node2id(hdl->ctrl_refs.prev)) {
2061 list_add_tail(&new_ref->node, &hdl->ctrl_refs);
2062 goto insert_in_hash;
2063 }
2064
2065 /* Find insert position in sorted list */
2066 list_for_each_entry(ref, &hdl->ctrl_refs, node) {
2067 if (ref->ctrl->id < id)
2068 continue;
2069 /* Don't add duplicates */
2070 if (ref->ctrl->id == id) {
2071 kfree(new_ref);
2072 goto unlock;
2073 }
2074 list_add(&new_ref->node, ref->node.prev);
2075 break;
2076 }
2077
2078 insert_in_hash:
2079 /* Insert the control node in the hash */
2080 new_ref->next = hdl->buckets[bucket];
2081 hdl->buckets[bucket] = new_ref;
2082
2083 unlock:
2084 mutex_unlock(hdl->lock);
2085 return 0;
2086 }
2087
2088 /* 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)2089 static struct v4l2_ctrl *v4l2_ctrl_new(struct v4l2_ctrl_handler *hdl,
2090 const struct v4l2_ctrl_ops *ops,
2091 const struct v4l2_ctrl_type_ops *type_ops,
2092 u32 id, const char *name, enum v4l2_ctrl_type type,
2093 s64 min, s64 max, u64 step, s64 def,
2094 const u32 dims[V4L2_CTRL_MAX_DIMS], u32 elem_size,
2095 u32 flags, const char * const *qmenu,
2096 const s64 *qmenu_int, void *priv)
2097 {
2098 struct v4l2_ctrl *ctrl;
2099 unsigned sz_extra;
2100 unsigned nr_of_dims = 0;
2101 unsigned elems = 1;
2102 bool is_array;
2103 unsigned tot_ctrl_size;
2104 unsigned idx;
2105 void *data;
2106 int err;
2107
2108 if (hdl->error)
2109 return NULL;
2110
2111 while (dims && dims[nr_of_dims]) {
2112 elems *= dims[nr_of_dims];
2113 nr_of_dims++;
2114 if (nr_of_dims == V4L2_CTRL_MAX_DIMS)
2115 break;
2116 }
2117 is_array = nr_of_dims > 0;
2118
2119 /* Prefill elem_size for all types handled by std_type_ops */
2120 switch (type) {
2121 case V4L2_CTRL_TYPE_INTEGER64:
2122 elem_size = sizeof(s64);
2123 break;
2124 case V4L2_CTRL_TYPE_STRING:
2125 elem_size = max + 1;
2126 break;
2127 case V4L2_CTRL_TYPE_U8:
2128 elem_size = sizeof(u8);
2129 break;
2130 case V4L2_CTRL_TYPE_U16:
2131 elem_size = sizeof(u16);
2132 break;
2133 case V4L2_CTRL_TYPE_U32:
2134 elem_size = sizeof(u32);
2135 break;
2136 default:
2137 if (type < V4L2_CTRL_COMPOUND_TYPES)
2138 elem_size = sizeof(s32);
2139 break;
2140 }
2141 tot_ctrl_size = elem_size * elems;
2142
2143 /* Sanity checks */
2144 if (id == 0 || name == NULL || !elem_size ||
2145 id >= V4L2_CID_PRIVATE_BASE ||
2146 (type == V4L2_CTRL_TYPE_MENU && qmenu == NULL) ||
2147 (type == V4L2_CTRL_TYPE_INTEGER_MENU && qmenu_int == NULL)) {
2148 handler_set_err(hdl, -ERANGE);
2149 return NULL;
2150 }
2151 err = check_range(type, min, max, step, def);
2152 if (err) {
2153 handler_set_err(hdl, err);
2154 return NULL;
2155 }
2156 if (is_array &&
2157 (type == V4L2_CTRL_TYPE_BUTTON ||
2158 type == V4L2_CTRL_TYPE_CTRL_CLASS)) {
2159 handler_set_err(hdl, -EINVAL);
2160 return NULL;
2161 }
2162
2163 sz_extra = 0;
2164 if (type == V4L2_CTRL_TYPE_BUTTON)
2165 flags |= V4L2_CTRL_FLAG_WRITE_ONLY |
2166 V4L2_CTRL_FLAG_EXECUTE_ON_WRITE;
2167 else if (type == V4L2_CTRL_TYPE_CTRL_CLASS)
2168 flags |= V4L2_CTRL_FLAG_READ_ONLY;
2169 else if (type == V4L2_CTRL_TYPE_INTEGER64 ||
2170 type == V4L2_CTRL_TYPE_STRING ||
2171 type >= V4L2_CTRL_COMPOUND_TYPES ||
2172 is_array)
2173 sz_extra += 2 * tot_ctrl_size;
2174
2175 ctrl = kvzalloc(sizeof(*ctrl) + sz_extra, GFP_KERNEL);
2176 if (ctrl == NULL) {
2177 handler_set_err(hdl, -ENOMEM);
2178 return NULL;
2179 }
2180
2181 INIT_LIST_HEAD(&ctrl->node);
2182 INIT_LIST_HEAD(&ctrl->ev_subs);
2183 ctrl->handler = hdl;
2184 ctrl->ops = ops;
2185 ctrl->type_ops = type_ops ? type_ops : &std_type_ops;
2186 ctrl->id = id;
2187 ctrl->name = name;
2188 ctrl->type = type;
2189 ctrl->flags = flags;
2190 ctrl->minimum = min;
2191 ctrl->maximum = max;
2192 ctrl->step = step;
2193 ctrl->default_value = def;
2194 ctrl->is_string = !is_array && type == V4L2_CTRL_TYPE_STRING;
2195 ctrl->is_ptr = is_array || type >= V4L2_CTRL_COMPOUND_TYPES || ctrl->is_string;
2196 ctrl->is_int = !ctrl->is_ptr && type != V4L2_CTRL_TYPE_INTEGER64;
2197 ctrl->is_array = is_array;
2198 ctrl->elems = elems;
2199 ctrl->nr_of_dims = nr_of_dims;
2200 if (nr_of_dims)
2201 memcpy(ctrl->dims, dims, nr_of_dims * sizeof(dims[0]));
2202 ctrl->elem_size = elem_size;
2203 if (type == V4L2_CTRL_TYPE_MENU)
2204 ctrl->qmenu = qmenu;
2205 else if (type == V4L2_CTRL_TYPE_INTEGER_MENU)
2206 ctrl->qmenu_int = qmenu_int;
2207 ctrl->priv = priv;
2208 ctrl->cur.val = ctrl->val = def;
2209 data = &ctrl[1];
2210
2211 if (!ctrl->is_int) {
2212 ctrl->p_new.p = data;
2213 ctrl->p_cur.p = data + tot_ctrl_size;
2214 } else {
2215 ctrl->p_new.p = &ctrl->val;
2216 ctrl->p_cur.p = &ctrl->cur.val;
2217 }
2218 for (idx = 0; idx < elems; idx++) {
2219 ctrl->type_ops->init(ctrl, idx, ctrl->p_cur);
2220 ctrl->type_ops->init(ctrl, idx, ctrl->p_new);
2221 }
2222
2223 if (handler_new_ref(hdl, ctrl)) {
2224 kvfree(ctrl);
2225 return NULL;
2226 }
2227 mutex_lock(hdl->lock);
2228 list_add_tail(&ctrl->node, &hdl->ctrls);
2229 mutex_unlock(hdl->lock);
2230 return ctrl;
2231 }
2232
v4l2_ctrl_new_custom(struct v4l2_ctrl_handler * hdl,const struct v4l2_ctrl_config * cfg,void * priv)2233 struct v4l2_ctrl *v4l2_ctrl_new_custom(struct v4l2_ctrl_handler *hdl,
2234 const struct v4l2_ctrl_config *cfg, void *priv)
2235 {
2236 bool is_menu;
2237 struct v4l2_ctrl *ctrl;
2238 const char *name = cfg->name;
2239 const char * const *qmenu = cfg->qmenu;
2240 const s64 *qmenu_int = cfg->qmenu_int;
2241 enum v4l2_ctrl_type type = cfg->type;
2242 u32 flags = cfg->flags;
2243 s64 min = cfg->min;
2244 s64 max = cfg->max;
2245 u64 step = cfg->step;
2246 s64 def = cfg->def;
2247
2248 if (name == NULL)
2249 v4l2_ctrl_fill(cfg->id, &name, &type, &min, &max, &step,
2250 &def, &flags);
2251
2252 is_menu = (cfg->type == V4L2_CTRL_TYPE_MENU ||
2253 cfg->type == V4L2_CTRL_TYPE_INTEGER_MENU);
2254 if (is_menu)
2255 WARN_ON(step);
2256 else
2257 WARN_ON(cfg->menu_skip_mask);
2258 if (cfg->type == V4L2_CTRL_TYPE_MENU && qmenu == NULL)
2259 qmenu = v4l2_ctrl_get_menu(cfg->id);
2260 else if (cfg->type == V4L2_CTRL_TYPE_INTEGER_MENU &&
2261 qmenu_int == NULL) {
2262 handler_set_err(hdl, -EINVAL);
2263 return NULL;
2264 }
2265
2266 ctrl = v4l2_ctrl_new(hdl, cfg->ops, cfg->type_ops, cfg->id, name,
2267 type, min, max,
2268 is_menu ? cfg->menu_skip_mask : step, def,
2269 cfg->dims, cfg->elem_size,
2270 flags, qmenu, qmenu_int, priv);
2271 if (ctrl)
2272 ctrl->is_private = cfg->is_private;
2273 return ctrl;
2274 }
2275 EXPORT_SYMBOL(v4l2_ctrl_new_custom);
2276
2277 /* 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)2278 struct v4l2_ctrl *v4l2_ctrl_new_std(struct v4l2_ctrl_handler *hdl,
2279 const struct v4l2_ctrl_ops *ops,
2280 u32 id, s64 min, s64 max, u64 step, s64 def)
2281 {
2282 const char *name;
2283 enum v4l2_ctrl_type type;
2284 u32 flags;
2285
2286 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
2287 if (type == V4L2_CTRL_TYPE_MENU ||
2288 type == V4L2_CTRL_TYPE_INTEGER_MENU ||
2289 type >= V4L2_CTRL_COMPOUND_TYPES) {
2290 handler_set_err(hdl, -EINVAL);
2291 return NULL;
2292 }
2293 return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
2294 min, max, step, def, NULL, 0,
2295 flags, NULL, NULL, NULL);
2296 }
2297 EXPORT_SYMBOL(v4l2_ctrl_new_std);
2298
2299 /* 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)2300 struct v4l2_ctrl *v4l2_ctrl_new_std_menu(struct v4l2_ctrl_handler *hdl,
2301 const struct v4l2_ctrl_ops *ops,
2302 u32 id, u8 _max, u64 mask, u8 _def)
2303 {
2304 const char * const *qmenu = NULL;
2305 const s64 *qmenu_int = NULL;
2306 unsigned int qmenu_int_len = 0;
2307 const char *name;
2308 enum v4l2_ctrl_type type;
2309 s64 min;
2310 s64 max = _max;
2311 s64 def = _def;
2312 u64 step;
2313 u32 flags;
2314
2315 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
2316
2317 if (type == V4L2_CTRL_TYPE_MENU)
2318 qmenu = v4l2_ctrl_get_menu(id);
2319 else if (type == V4L2_CTRL_TYPE_INTEGER_MENU)
2320 qmenu_int = v4l2_ctrl_get_int_menu(id, &qmenu_int_len);
2321
2322 if ((!qmenu && !qmenu_int) || (qmenu_int && max > qmenu_int_len)) {
2323 handler_set_err(hdl, -EINVAL);
2324 return NULL;
2325 }
2326 return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
2327 0, max, mask, def, NULL, 0,
2328 flags, qmenu, qmenu_int, NULL);
2329 }
2330 EXPORT_SYMBOL(v4l2_ctrl_new_std_menu);
2331
2332 /* 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)2333 struct v4l2_ctrl *v4l2_ctrl_new_std_menu_items(struct v4l2_ctrl_handler *hdl,
2334 const struct v4l2_ctrl_ops *ops, u32 id, u8 _max,
2335 u64 mask, u8 _def, const char * const *qmenu)
2336 {
2337 enum v4l2_ctrl_type type;
2338 const char *name;
2339 u32 flags;
2340 u64 step;
2341 s64 min;
2342 s64 max = _max;
2343 s64 def = _def;
2344
2345 /* v4l2_ctrl_new_std_menu_items() should only be called for
2346 * standard controls without a standard menu.
2347 */
2348 if (v4l2_ctrl_get_menu(id)) {
2349 handler_set_err(hdl, -EINVAL);
2350 return NULL;
2351 }
2352
2353 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
2354 if (type != V4L2_CTRL_TYPE_MENU || qmenu == NULL) {
2355 handler_set_err(hdl, -EINVAL);
2356 return NULL;
2357 }
2358 return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
2359 0, max, mask, def, NULL, 0,
2360 flags, qmenu, NULL, NULL);
2361
2362 }
2363 EXPORT_SYMBOL(v4l2_ctrl_new_std_menu_items);
2364
2365 /* 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)2366 struct v4l2_ctrl *v4l2_ctrl_new_int_menu(struct v4l2_ctrl_handler *hdl,
2367 const struct v4l2_ctrl_ops *ops,
2368 u32 id, u8 _max, u8 _def, const s64 *qmenu_int)
2369 {
2370 const char *name;
2371 enum v4l2_ctrl_type type;
2372 s64 min;
2373 u64 step;
2374 s64 max = _max;
2375 s64 def = _def;
2376 u32 flags;
2377
2378 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
2379 if (type != V4L2_CTRL_TYPE_INTEGER_MENU) {
2380 handler_set_err(hdl, -EINVAL);
2381 return NULL;
2382 }
2383 return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
2384 0, max, 0, def, NULL, 0,
2385 flags, NULL, qmenu_int, NULL);
2386 }
2387 EXPORT_SYMBOL(v4l2_ctrl_new_int_menu);
2388
2389 /* 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))2390 int v4l2_ctrl_add_handler(struct v4l2_ctrl_handler *hdl,
2391 struct v4l2_ctrl_handler *add,
2392 bool (*filter)(const struct v4l2_ctrl *ctrl))
2393 {
2394 struct v4l2_ctrl_ref *ref;
2395 int ret = 0;
2396
2397 /* Do nothing if either handler is NULL or if they are the same */
2398 if (!hdl || !add || hdl == add)
2399 return 0;
2400 if (hdl->error)
2401 return hdl->error;
2402 mutex_lock(add->lock);
2403 list_for_each_entry(ref, &add->ctrl_refs, node) {
2404 struct v4l2_ctrl *ctrl = ref->ctrl;
2405
2406 /* Skip handler-private controls. */
2407 if (ctrl->is_private)
2408 continue;
2409 /* And control classes */
2410 if (ctrl->type == V4L2_CTRL_TYPE_CTRL_CLASS)
2411 continue;
2412 /* Filter any unwanted controls */
2413 if (filter && !filter(ctrl))
2414 continue;
2415 ret = handler_new_ref(hdl, ctrl);
2416 if (ret)
2417 break;
2418 }
2419 mutex_unlock(add->lock);
2420 return ret;
2421 }
2422 EXPORT_SYMBOL(v4l2_ctrl_add_handler);
2423
v4l2_ctrl_radio_filter(const struct v4l2_ctrl * ctrl)2424 bool v4l2_ctrl_radio_filter(const struct v4l2_ctrl *ctrl)
2425 {
2426 if (V4L2_CTRL_ID2WHICH(ctrl->id) == V4L2_CTRL_CLASS_FM_TX)
2427 return true;
2428 if (V4L2_CTRL_ID2WHICH(ctrl->id) == V4L2_CTRL_CLASS_FM_RX)
2429 return true;
2430 switch (ctrl->id) {
2431 case V4L2_CID_AUDIO_MUTE:
2432 case V4L2_CID_AUDIO_VOLUME:
2433 case V4L2_CID_AUDIO_BALANCE:
2434 case V4L2_CID_AUDIO_BASS:
2435 case V4L2_CID_AUDIO_TREBLE:
2436 case V4L2_CID_AUDIO_LOUDNESS:
2437 return true;
2438 default:
2439 break;
2440 }
2441 return false;
2442 }
2443 EXPORT_SYMBOL(v4l2_ctrl_radio_filter);
2444
2445 /* Cluster controls */
v4l2_ctrl_cluster(unsigned ncontrols,struct v4l2_ctrl ** controls)2446 void v4l2_ctrl_cluster(unsigned ncontrols, struct v4l2_ctrl **controls)
2447 {
2448 bool has_volatiles = false;
2449 int i;
2450
2451 /* The first control is the master control and it must not be NULL */
2452 if (WARN_ON(ncontrols == 0 || controls[0] == NULL))
2453 return;
2454
2455 for (i = 0; i < ncontrols; i++) {
2456 if (controls[i]) {
2457 controls[i]->cluster = controls;
2458 controls[i]->ncontrols = ncontrols;
2459 if (controls[i]->flags & V4L2_CTRL_FLAG_VOLATILE)
2460 has_volatiles = true;
2461 }
2462 }
2463 controls[0]->has_volatiles = has_volatiles;
2464 }
2465 EXPORT_SYMBOL(v4l2_ctrl_cluster);
2466
v4l2_ctrl_auto_cluster(unsigned ncontrols,struct v4l2_ctrl ** controls,u8 manual_val,bool set_volatile)2467 void v4l2_ctrl_auto_cluster(unsigned ncontrols, struct v4l2_ctrl **controls,
2468 u8 manual_val, bool set_volatile)
2469 {
2470 struct v4l2_ctrl *master = controls[0];
2471 u32 flag = 0;
2472 int i;
2473
2474 v4l2_ctrl_cluster(ncontrols, controls);
2475 WARN_ON(ncontrols <= 1);
2476 WARN_ON(manual_val < master->minimum || manual_val > master->maximum);
2477 WARN_ON(set_volatile && !has_op(master, g_volatile_ctrl));
2478 master->is_auto = true;
2479 master->has_volatiles = set_volatile;
2480 master->manual_mode_value = manual_val;
2481 master->flags |= V4L2_CTRL_FLAG_UPDATE;
2482
2483 if (!is_cur_manual(master))
2484 flag = V4L2_CTRL_FLAG_INACTIVE |
2485 (set_volatile ? V4L2_CTRL_FLAG_VOLATILE : 0);
2486
2487 for (i = 1; i < ncontrols; i++)
2488 if (controls[i])
2489 controls[i]->flags |= flag;
2490 }
2491 EXPORT_SYMBOL(v4l2_ctrl_auto_cluster);
2492
2493 /* Activate/deactivate a control. */
v4l2_ctrl_activate(struct v4l2_ctrl * ctrl,bool active)2494 void v4l2_ctrl_activate(struct v4l2_ctrl *ctrl, bool active)
2495 {
2496 /* invert since the actual flag is called 'inactive' */
2497 bool inactive = !active;
2498 bool old;
2499
2500 if (ctrl == NULL)
2501 return;
2502
2503 if (inactive)
2504 /* set V4L2_CTRL_FLAG_INACTIVE */
2505 old = test_and_set_bit(4, &ctrl->flags);
2506 else
2507 /* clear V4L2_CTRL_FLAG_INACTIVE */
2508 old = test_and_clear_bit(4, &ctrl->flags);
2509 if (old != inactive)
2510 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_FLAGS);
2511 }
2512 EXPORT_SYMBOL(v4l2_ctrl_activate);
2513
2514 /* Grab/ungrab a control.
2515 Typically used when streaming starts and you want to grab controls,
2516 preventing the user from changing them.
2517
2518 Just call this and the framework will block any attempts to change
2519 these controls. */
v4l2_ctrl_grab(struct v4l2_ctrl * ctrl,bool grabbed)2520 void v4l2_ctrl_grab(struct v4l2_ctrl *ctrl, bool grabbed)
2521 {
2522 bool old;
2523
2524 if (ctrl == NULL)
2525 return;
2526
2527 v4l2_ctrl_lock(ctrl);
2528 if (grabbed)
2529 /* set V4L2_CTRL_FLAG_GRABBED */
2530 old = test_and_set_bit(1, &ctrl->flags);
2531 else
2532 /* clear V4L2_CTRL_FLAG_GRABBED */
2533 old = test_and_clear_bit(1, &ctrl->flags);
2534 if (old != grabbed)
2535 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_FLAGS);
2536 v4l2_ctrl_unlock(ctrl);
2537 }
2538 EXPORT_SYMBOL(v4l2_ctrl_grab);
2539
2540 /* Log the control name and value */
log_ctrl(const struct v4l2_ctrl * ctrl,const char * prefix,const char * colon)2541 static void log_ctrl(const struct v4l2_ctrl *ctrl,
2542 const char *prefix, const char *colon)
2543 {
2544 if (ctrl->flags & (V4L2_CTRL_FLAG_DISABLED | V4L2_CTRL_FLAG_WRITE_ONLY))
2545 return;
2546 if (ctrl->type == V4L2_CTRL_TYPE_CTRL_CLASS)
2547 return;
2548
2549 pr_info("%s%s%s: ", prefix, colon, ctrl->name);
2550
2551 ctrl->type_ops->log(ctrl);
2552
2553 if (ctrl->flags & (V4L2_CTRL_FLAG_INACTIVE |
2554 V4L2_CTRL_FLAG_GRABBED |
2555 V4L2_CTRL_FLAG_VOLATILE)) {
2556 if (ctrl->flags & V4L2_CTRL_FLAG_INACTIVE)
2557 pr_cont(" inactive");
2558 if (ctrl->flags & V4L2_CTRL_FLAG_GRABBED)
2559 pr_cont(" grabbed");
2560 if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE)
2561 pr_cont(" volatile");
2562 }
2563 pr_cont("\n");
2564 }
2565
2566 /* Log all controls owned by the handler */
v4l2_ctrl_handler_log_status(struct v4l2_ctrl_handler * hdl,const char * prefix)2567 void v4l2_ctrl_handler_log_status(struct v4l2_ctrl_handler *hdl,
2568 const char *prefix)
2569 {
2570 struct v4l2_ctrl *ctrl;
2571 const char *colon = "";
2572 int len;
2573
2574 if (hdl == NULL)
2575 return;
2576 if (prefix == NULL)
2577 prefix = "";
2578 len = strlen(prefix);
2579 if (len && prefix[len - 1] != ' ')
2580 colon = ": ";
2581 mutex_lock(hdl->lock);
2582 list_for_each_entry(ctrl, &hdl->ctrls, node)
2583 if (!(ctrl->flags & V4L2_CTRL_FLAG_DISABLED))
2584 log_ctrl(ctrl, prefix, colon);
2585 mutex_unlock(hdl->lock);
2586 }
2587 EXPORT_SYMBOL(v4l2_ctrl_handler_log_status);
2588
v4l2_ctrl_subdev_log_status(struct v4l2_subdev * sd)2589 int v4l2_ctrl_subdev_log_status(struct v4l2_subdev *sd)
2590 {
2591 v4l2_ctrl_handler_log_status(sd->ctrl_handler, sd->name);
2592 return 0;
2593 }
2594 EXPORT_SYMBOL(v4l2_ctrl_subdev_log_status);
2595
2596 /* Call s_ctrl for all controls owned by the handler */
__v4l2_ctrl_handler_setup(struct v4l2_ctrl_handler * hdl)2597 int __v4l2_ctrl_handler_setup(struct v4l2_ctrl_handler *hdl)
2598 {
2599 struct v4l2_ctrl *ctrl;
2600 int ret = 0;
2601
2602 if (hdl == NULL)
2603 return 0;
2604
2605 lockdep_assert_held(hdl->lock);
2606
2607 list_for_each_entry(ctrl, &hdl->ctrls, node)
2608 ctrl->done = false;
2609
2610 list_for_each_entry(ctrl, &hdl->ctrls, node) {
2611 struct v4l2_ctrl *master = ctrl->cluster[0];
2612 int i;
2613
2614 /* Skip if this control was already handled by a cluster. */
2615 /* Skip button controls and read-only controls. */
2616 if (ctrl->done || ctrl->type == V4L2_CTRL_TYPE_BUTTON ||
2617 (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY))
2618 continue;
2619
2620 for (i = 0; i < master->ncontrols; i++) {
2621 if (master->cluster[i]) {
2622 cur_to_new(master->cluster[i]);
2623 master->cluster[i]->is_new = 1;
2624 master->cluster[i]->done = true;
2625 }
2626 }
2627 ret = call_op(master, s_ctrl);
2628 if (ret)
2629 break;
2630 }
2631
2632 return ret;
2633 }
2634 EXPORT_SYMBOL_GPL(__v4l2_ctrl_handler_setup);
2635
v4l2_ctrl_handler_setup(struct v4l2_ctrl_handler * hdl)2636 int v4l2_ctrl_handler_setup(struct v4l2_ctrl_handler *hdl)
2637 {
2638 int ret;
2639
2640 if (hdl == NULL)
2641 return 0;
2642
2643 mutex_lock(hdl->lock);
2644 ret = __v4l2_ctrl_handler_setup(hdl);
2645 mutex_unlock(hdl->lock);
2646
2647 return ret;
2648 }
2649 EXPORT_SYMBOL(v4l2_ctrl_handler_setup);
2650
2651 /* Implement VIDIOC_QUERY_EXT_CTRL */
v4l2_query_ext_ctrl(struct v4l2_ctrl_handler * hdl,struct v4l2_query_ext_ctrl * qc)2652 int v4l2_query_ext_ctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_query_ext_ctrl *qc)
2653 {
2654 const unsigned next_flags = V4L2_CTRL_FLAG_NEXT_CTRL | V4L2_CTRL_FLAG_NEXT_COMPOUND;
2655 u32 id = qc->id & V4L2_CTRL_ID_MASK;
2656 struct v4l2_ctrl_ref *ref;
2657 struct v4l2_ctrl *ctrl;
2658
2659 if (hdl == NULL)
2660 return -EINVAL;
2661
2662 mutex_lock(hdl->lock);
2663
2664 /* Try to find it */
2665 ref = find_ref(hdl, id);
2666
2667 if ((qc->id & next_flags) && !list_empty(&hdl->ctrl_refs)) {
2668 bool is_compound;
2669 /* Match any control that is not hidden */
2670 unsigned mask = 1;
2671 bool match = false;
2672
2673 if ((qc->id & next_flags) == V4L2_CTRL_FLAG_NEXT_COMPOUND) {
2674 /* Match any hidden control */
2675 match = true;
2676 } else if ((qc->id & next_flags) == next_flags) {
2677 /* Match any control, compound or not */
2678 mask = 0;
2679 }
2680
2681 /* Find the next control with ID > qc->id */
2682
2683 /* Did we reach the end of the control list? */
2684 if (id >= node2id(hdl->ctrl_refs.prev)) {
2685 ref = NULL; /* Yes, so there is no next control */
2686 } else if (ref) {
2687 /* We found a control with the given ID, so just get
2688 the next valid one in the list. */
2689 list_for_each_entry_continue(ref, &hdl->ctrl_refs, node) {
2690 is_compound = ref->ctrl->is_array ||
2691 ref->ctrl->type >= V4L2_CTRL_COMPOUND_TYPES;
2692 if (id < ref->ctrl->id &&
2693 (is_compound & mask) == match)
2694 break;
2695 }
2696 if (&ref->node == &hdl->ctrl_refs)
2697 ref = NULL;
2698 } else {
2699 /* No control with the given ID exists, so start
2700 searching for the next largest ID. We know there
2701 is one, otherwise the first 'if' above would have
2702 been true. */
2703 list_for_each_entry(ref, &hdl->ctrl_refs, node) {
2704 is_compound = ref->ctrl->is_array ||
2705 ref->ctrl->type >= V4L2_CTRL_COMPOUND_TYPES;
2706 if (id < ref->ctrl->id &&
2707 (is_compound & mask) == match)
2708 break;
2709 }
2710 if (&ref->node == &hdl->ctrl_refs)
2711 ref = NULL;
2712 }
2713 }
2714 mutex_unlock(hdl->lock);
2715
2716 if (!ref)
2717 return -EINVAL;
2718
2719 ctrl = ref->ctrl;
2720 memset(qc, 0, sizeof(*qc));
2721 if (id >= V4L2_CID_PRIVATE_BASE)
2722 qc->id = id;
2723 else
2724 qc->id = ctrl->id;
2725 strlcpy(qc->name, ctrl->name, sizeof(qc->name));
2726 qc->flags = user_flags(ctrl);
2727 qc->type = ctrl->type;
2728 qc->elem_size = ctrl->elem_size;
2729 qc->elems = ctrl->elems;
2730 qc->nr_of_dims = ctrl->nr_of_dims;
2731 memcpy(qc->dims, ctrl->dims, qc->nr_of_dims * sizeof(qc->dims[0]));
2732 qc->minimum = ctrl->minimum;
2733 qc->maximum = ctrl->maximum;
2734 qc->default_value = ctrl->default_value;
2735 if (ctrl->type == V4L2_CTRL_TYPE_MENU
2736 || ctrl->type == V4L2_CTRL_TYPE_INTEGER_MENU)
2737 qc->step = 1;
2738 else
2739 qc->step = ctrl->step;
2740 return 0;
2741 }
2742 EXPORT_SYMBOL(v4l2_query_ext_ctrl);
2743
2744 /* Implement VIDIOC_QUERYCTRL */
v4l2_queryctrl(struct v4l2_ctrl_handler * hdl,struct v4l2_queryctrl * qc)2745 int v4l2_queryctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_queryctrl *qc)
2746 {
2747 struct v4l2_query_ext_ctrl qec = { qc->id };
2748 int rc;
2749
2750 rc = v4l2_query_ext_ctrl(hdl, &qec);
2751 if (rc)
2752 return rc;
2753
2754 qc->id = qec.id;
2755 qc->type = qec.type;
2756 qc->flags = qec.flags;
2757 strlcpy(qc->name, qec.name, sizeof(qc->name));
2758 switch (qc->type) {
2759 case V4L2_CTRL_TYPE_INTEGER:
2760 case V4L2_CTRL_TYPE_BOOLEAN:
2761 case V4L2_CTRL_TYPE_MENU:
2762 case V4L2_CTRL_TYPE_INTEGER_MENU:
2763 case V4L2_CTRL_TYPE_STRING:
2764 case V4L2_CTRL_TYPE_BITMASK:
2765 qc->minimum = qec.minimum;
2766 qc->maximum = qec.maximum;
2767 qc->step = qec.step;
2768 qc->default_value = qec.default_value;
2769 break;
2770 default:
2771 qc->minimum = 0;
2772 qc->maximum = 0;
2773 qc->step = 0;
2774 qc->default_value = 0;
2775 break;
2776 }
2777 return 0;
2778 }
2779 EXPORT_SYMBOL(v4l2_queryctrl);
2780
2781 /* Implement VIDIOC_QUERYMENU */
v4l2_querymenu(struct v4l2_ctrl_handler * hdl,struct v4l2_querymenu * qm)2782 int v4l2_querymenu(struct v4l2_ctrl_handler *hdl, struct v4l2_querymenu *qm)
2783 {
2784 struct v4l2_ctrl *ctrl;
2785 u32 i = qm->index;
2786
2787 ctrl = v4l2_ctrl_find(hdl, qm->id);
2788 if (!ctrl)
2789 return -EINVAL;
2790
2791 qm->reserved = 0;
2792 /* Sanity checks */
2793 switch (ctrl->type) {
2794 case V4L2_CTRL_TYPE_MENU:
2795 if (ctrl->qmenu == NULL)
2796 return -EINVAL;
2797 break;
2798 case V4L2_CTRL_TYPE_INTEGER_MENU:
2799 if (ctrl->qmenu_int == NULL)
2800 return -EINVAL;
2801 break;
2802 default:
2803 return -EINVAL;
2804 }
2805
2806 if (i < ctrl->minimum || i > ctrl->maximum)
2807 return -EINVAL;
2808
2809 /* Use mask to see if this menu item should be skipped */
2810 if (ctrl->menu_skip_mask & (1 << i))
2811 return -EINVAL;
2812 /* Empty menu items should also be skipped */
2813 if (ctrl->type == V4L2_CTRL_TYPE_MENU) {
2814 if (ctrl->qmenu[i] == NULL || ctrl->qmenu[i][0] == '\0')
2815 return -EINVAL;
2816 strlcpy(qm->name, ctrl->qmenu[i], sizeof(qm->name));
2817 } else {
2818 qm->value = ctrl->qmenu_int[i];
2819 }
2820 return 0;
2821 }
2822 EXPORT_SYMBOL(v4l2_querymenu);
2823
2824
2825 /* Some general notes on the atomic requirements of VIDIOC_G/TRY/S_EXT_CTRLS:
2826
2827 It is not a fully atomic operation, just best-effort only. After all, if
2828 multiple controls have to be set through multiple i2c writes (for example)
2829 then some initial writes may succeed while others fail. Thus leaving the
2830 system in an inconsistent state. The question is how much effort you are
2831 willing to spend on trying to make something atomic that really isn't.
2832
2833 From the point of view of an application the main requirement is that
2834 when you call VIDIOC_S_EXT_CTRLS and some values are invalid then an
2835 error should be returned without actually affecting any controls.
2836
2837 If all the values are correct, then it is acceptable to just give up
2838 in case of low-level errors.
2839
2840 It is important though that the application can tell when only a partial
2841 configuration was done. The way we do that is through the error_idx field
2842 of struct v4l2_ext_controls: if that is equal to the count field then no
2843 controls were affected. Otherwise all controls before that index were
2844 successful in performing their 'get' or 'set' operation, the control at
2845 the given index failed, and you don't know what happened with the controls
2846 after the failed one. Since if they were part of a control cluster they
2847 could have been successfully processed (if a cluster member was encountered
2848 at index < error_idx), they could have failed (if a cluster member was at
2849 error_idx), or they may not have been processed yet (if the first cluster
2850 member appeared after error_idx).
2851
2852 It is all fairly theoretical, though. In practice all you can do is to
2853 bail out. If error_idx == count, then it is an application bug. If
2854 error_idx < count then it is only an application bug if the error code was
2855 EBUSY. That usually means that something started streaming just when you
2856 tried to set the controls. In all other cases it is a driver/hardware
2857 problem and all you can do is to retry or bail out.
2858
2859 Note that these rules do not apply to VIDIOC_TRY_EXT_CTRLS: since that
2860 never modifies controls the error_idx is just set to whatever control
2861 has an invalid value.
2862 */
2863
2864 /* Prepare for the extended g/s/try functions.
2865 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,bool get)2866 static int prepare_ext_ctrls(struct v4l2_ctrl_handler *hdl,
2867 struct v4l2_ext_controls *cs,
2868 struct v4l2_ctrl_helper *helpers,
2869 bool get)
2870 {
2871 struct v4l2_ctrl_helper *h;
2872 bool have_clusters = false;
2873 u32 i;
2874
2875 for (i = 0, h = helpers; i < cs->count; i++, h++) {
2876 struct v4l2_ext_control *c = &cs->controls[i];
2877 struct v4l2_ctrl_ref *ref;
2878 struct v4l2_ctrl *ctrl;
2879 u32 id = c->id & V4L2_CTRL_ID_MASK;
2880
2881 cs->error_idx = i;
2882
2883 if (cs->which &&
2884 cs->which != V4L2_CTRL_WHICH_DEF_VAL &&
2885 V4L2_CTRL_ID2WHICH(id) != cs->which)
2886 return -EINVAL;
2887
2888 /* Old-style private controls are not allowed for
2889 extended controls */
2890 if (id >= V4L2_CID_PRIVATE_BASE)
2891 return -EINVAL;
2892 ref = find_ref_lock(hdl, id);
2893 if (ref == NULL)
2894 return -EINVAL;
2895 ctrl = ref->ctrl;
2896 if (ctrl->flags & V4L2_CTRL_FLAG_DISABLED)
2897 return -EINVAL;
2898
2899 if (ctrl->cluster[0]->ncontrols > 1)
2900 have_clusters = true;
2901 if (ctrl->cluster[0] != ctrl)
2902 ref = find_ref_lock(hdl, ctrl->cluster[0]->id);
2903 if (ctrl->is_ptr && !ctrl->is_string) {
2904 unsigned tot_size = ctrl->elems * ctrl->elem_size;
2905
2906 if (c->size < tot_size) {
2907 if (get) {
2908 c->size = tot_size;
2909 return -ENOSPC;
2910 }
2911 return -EFAULT;
2912 }
2913 c->size = tot_size;
2914 }
2915 /* Store the ref to the master control of the cluster */
2916 h->mref = ref;
2917 h->ctrl = ctrl;
2918 /* Initially set next to 0, meaning that there is no other
2919 control in this helper array belonging to the same
2920 cluster */
2921 h->next = 0;
2922 }
2923
2924 /* We are done if there were no controls that belong to a multi-
2925 control cluster. */
2926 if (!have_clusters)
2927 return 0;
2928
2929 /* The code below figures out in O(n) time which controls in the list
2930 belong to the same cluster. */
2931
2932 /* This has to be done with the handler lock taken. */
2933 mutex_lock(hdl->lock);
2934
2935 /* First zero the helper field in the master control references */
2936 for (i = 0; i < cs->count; i++)
2937 helpers[i].mref->helper = NULL;
2938 for (i = 0, h = helpers; i < cs->count; i++, h++) {
2939 struct v4l2_ctrl_ref *mref = h->mref;
2940
2941 /* If the mref->helper is set, then it points to an earlier
2942 helper that belongs to the same cluster. */
2943 if (mref->helper) {
2944 /* Set the next field of mref->helper to the current
2945 index: this means that that earlier helper now
2946 points to the next helper in the same cluster. */
2947 mref->helper->next = i;
2948 /* mref should be set only for the first helper in the
2949 cluster, clear the others. */
2950 h->mref = NULL;
2951 }
2952 /* Point the mref helper to the current helper struct. */
2953 mref->helper = h;
2954 }
2955 mutex_unlock(hdl->lock);
2956 return 0;
2957 }
2958
2959 /* Handles the corner case where cs->count == 0. It checks whether the
2960 specified control class exists. If that class ID is 0, then it checks
2961 whether there are any controls at all. */
class_check(struct v4l2_ctrl_handler * hdl,u32 which)2962 static int class_check(struct v4l2_ctrl_handler *hdl, u32 which)
2963 {
2964 if (which == 0 || which == V4L2_CTRL_WHICH_DEF_VAL)
2965 return 0;
2966 return find_ref_lock(hdl, which | 1) ? 0 : -EINVAL;
2967 }
2968
2969
2970
2971 /* Get extended controls. Allocates the helpers array if needed. */
v4l2_g_ext_ctrls(struct v4l2_ctrl_handler * hdl,struct v4l2_ext_controls * cs)2972 int v4l2_g_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *cs)
2973 {
2974 struct v4l2_ctrl_helper helper[4];
2975 struct v4l2_ctrl_helper *helpers = helper;
2976 int ret;
2977 int i, j;
2978 bool def_value;
2979
2980 def_value = (cs->which == V4L2_CTRL_WHICH_DEF_VAL);
2981
2982 cs->error_idx = cs->count;
2983 cs->which = V4L2_CTRL_ID2WHICH(cs->which);
2984
2985 if (hdl == NULL)
2986 return -EINVAL;
2987
2988 if (cs->count == 0)
2989 return class_check(hdl, cs->which);
2990
2991 if (cs->count > ARRAY_SIZE(helper)) {
2992 helpers = kvmalloc_array(cs->count, sizeof(helper[0]),
2993 GFP_KERNEL);
2994 if (helpers == NULL)
2995 return -ENOMEM;
2996 }
2997
2998 ret = prepare_ext_ctrls(hdl, cs, helpers, true);
2999 cs->error_idx = cs->count;
3000
3001 for (i = 0; !ret && i < cs->count; i++)
3002 if (helpers[i].ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY)
3003 ret = -EACCES;
3004
3005 for (i = 0; !ret && i < cs->count; i++) {
3006 int (*ctrl_to_user)(struct v4l2_ext_control *c,
3007 struct v4l2_ctrl *ctrl);
3008 struct v4l2_ctrl *master;
3009
3010 ctrl_to_user = def_value ? def_to_user : cur_to_user;
3011
3012 if (helpers[i].mref == NULL)
3013 continue;
3014
3015 master = helpers[i].mref->ctrl;
3016 cs->error_idx = i;
3017
3018 v4l2_ctrl_lock(master);
3019
3020 /* g_volatile_ctrl will update the new control values */
3021 if (!def_value &&
3022 ((master->flags & V4L2_CTRL_FLAG_VOLATILE) ||
3023 (master->has_volatiles && !is_cur_manual(master)))) {
3024 for (j = 0; j < master->ncontrols; j++)
3025 cur_to_new(master->cluster[j]);
3026 ret = call_op(master, g_volatile_ctrl);
3027 ctrl_to_user = new_to_user;
3028 }
3029 /* If OK, then copy the current (for non-volatile controls)
3030 or the new (for volatile controls) control values to the
3031 caller */
3032 if (!ret) {
3033 u32 idx = i;
3034
3035 do {
3036 ret = ctrl_to_user(cs->controls + idx,
3037 helpers[idx].ctrl);
3038 idx = helpers[idx].next;
3039 } while (!ret && idx);
3040 }
3041 v4l2_ctrl_unlock(master);
3042 }
3043
3044 if (cs->count > ARRAY_SIZE(helper))
3045 kvfree(helpers);
3046 return ret;
3047 }
3048 EXPORT_SYMBOL(v4l2_g_ext_ctrls);
3049
3050 /* Helper function to get a single control */
get_ctrl(struct v4l2_ctrl * ctrl,struct v4l2_ext_control * c)3051 static int get_ctrl(struct v4l2_ctrl *ctrl, struct v4l2_ext_control *c)
3052 {
3053 struct v4l2_ctrl *master = ctrl->cluster[0];
3054 int ret = 0;
3055 int i;
3056
3057 /* Compound controls are not supported. The new_to_user() and
3058 * cur_to_user() calls below would need to be modified not to access
3059 * userspace memory when called from get_ctrl().
3060 */
3061 if (!ctrl->is_int && ctrl->type != V4L2_CTRL_TYPE_INTEGER64)
3062 return -EINVAL;
3063
3064 if (ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY)
3065 return -EACCES;
3066
3067 v4l2_ctrl_lock(master);
3068 /* g_volatile_ctrl will update the current control values */
3069 if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE) {
3070 for (i = 0; i < master->ncontrols; i++)
3071 cur_to_new(master->cluster[i]);
3072 ret = call_op(master, g_volatile_ctrl);
3073 new_to_user(c, ctrl);
3074 } else {
3075 cur_to_user(c, ctrl);
3076 }
3077 v4l2_ctrl_unlock(master);
3078 return ret;
3079 }
3080
v4l2_g_ctrl(struct v4l2_ctrl_handler * hdl,struct v4l2_control * control)3081 int v4l2_g_ctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_control *control)
3082 {
3083 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, control->id);
3084 struct v4l2_ext_control c;
3085 int ret;
3086
3087 if (ctrl == NULL || !ctrl->is_int)
3088 return -EINVAL;
3089 ret = get_ctrl(ctrl, &c);
3090 control->value = c.value;
3091 return ret;
3092 }
3093 EXPORT_SYMBOL(v4l2_g_ctrl);
3094
v4l2_ctrl_g_ctrl(struct v4l2_ctrl * ctrl)3095 s32 v4l2_ctrl_g_ctrl(struct v4l2_ctrl *ctrl)
3096 {
3097 struct v4l2_ext_control c;
3098
3099 /* It's a driver bug if this happens. */
3100 WARN_ON(!ctrl->is_int);
3101 c.value = 0;
3102 get_ctrl(ctrl, &c);
3103 return c.value;
3104 }
3105 EXPORT_SYMBOL(v4l2_ctrl_g_ctrl);
3106
v4l2_ctrl_g_ctrl_int64(struct v4l2_ctrl * ctrl)3107 s64 v4l2_ctrl_g_ctrl_int64(struct v4l2_ctrl *ctrl)
3108 {
3109 struct v4l2_ext_control c;
3110
3111 /* It's a driver bug if this happens. */
3112 WARN_ON(ctrl->is_ptr || ctrl->type != V4L2_CTRL_TYPE_INTEGER64);
3113 c.value64 = 0;
3114 get_ctrl(ctrl, &c);
3115 return c.value64;
3116 }
3117 EXPORT_SYMBOL(v4l2_ctrl_g_ctrl_int64);
3118
3119
3120 /* Core function that calls try/s_ctrl and ensures that the new value is
3121 copied to the current value on a set.
3122 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)3123 static int try_or_set_cluster(struct v4l2_fh *fh, struct v4l2_ctrl *master,
3124 bool set, u32 ch_flags)
3125 {
3126 bool update_flag;
3127 int ret;
3128 int i;
3129
3130 /* Go through the cluster and either validate the new value or
3131 (if no new value was set), copy the current value to the new
3132 value, ensuring a consistent view for the control ops when
3133 called. */
3134 for (i = 0; i < master->ncontrols; i++) {
3135 struct v4l2_ctrl *ctrl = master->cluster[i];
3136
3137 if (ctrl == NULL)
3138 continue;
3139
3140 if (!ctrl->is_new) {
3141 cur_to_new(ctrl);
3142 continue;
3143 }
3144 /* Check again: it may have changed since the
3145 previous check in try_or_set_ext_ctrls(). */
3146 if (set && (ctrl->flags & V4L2_CTRL_FLAG_GRABBED))
3147 return -EBUSY;
3148 }
3149
3150 ret = call_op(master, try_ctrl);
3151
3152 /* Don't set if there is no change */
3153 if (ret || !set || !cluster_changed(master))
3154 return ret;
3155 ret = call_op(master, s_ctrl);
3156 if (ret)
3157 return ret;
3158
3159 /* If OK, then make the new values permanent. */
3160 update_flag = is_cur_manual(master) != is_new_manual(master);
3161
3162 for (i = 0; i < master->ncontrols; i++) {
3163 /*
3164 * If we switch from auto to manual mode, and this cluster
3165 * contains volatile controls, then all non-master controls
3166 * have to be marked as changed. The 'new' value contains
3167 * the volatile value (obtained by update_from_auto_cluster),
3168 * which now has to become the current value.
3169 */
3170 if (i && update_flag && is_new_manual(master) &&
3171 master->has_volatiles && master->cluster[i])
3172 master->cluster[i]->has_changed = true;
3173
3174 new_to_cur(fh, master->cluster[i], ch_flags |
3175 ((update_flag && i > 0) ? V4L2_EVENT_CTRL_CH_FLAGS : 0));
3176 }
3177 return 0;
3178 }
3179
3180 /* Validate controls. */
validate_ctrls(struct v4l2_ext_controls * cs,struct v4l2_ctrl_helper * helpers,bool set)3181 static int validate_ctrls(struct v4l2_ext_controls *cs,
3182 struct v4l2_ctrl_helper *helpers, bool set)
3183 {
3184 unsigned i;
3185 int ret = 0;
3186
3187 cs->error_idx = cs->count;
3188 for (i = 0; i < cs->count; i++) {
3189 struct v4l2_ctrl *ctrl = helpers[i].ctrl;
3190 union v4l2_ctrl_ptr p_new;
3191
3192 cs->error_idx = i;
3193
3194 if (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY)
3195 return -EACCES;
3196 /* This test is also done in try_set_control_cluster() which
3197 is called in atomic context, so that has the final say,
3198 but it makes sense to do an up-front check as well. Once
3199 an error occurs in try_set_control_cluster() some other
3200 controls may have been set already and we want to do a
3201 best-effort to avoid that. */
3202 if (set && (ctrl->flags & V4L2_CTRL_FLAG_GRABBED))
3203 return -EBUSY;
3204 /*
3205 * Skip validation for now if the payload needs to be copied
3206 * from userspace into kernelspace. We'll validate those later.
3207 */
3208 if (ctrl->is_ptr)
3209 continue;
3210 if (ctrl->type == V4L2_CTRL_TYPE_INTEGER64)
3211 p_new.p_s64 = &cs->controls[i].value64;
3212 else
3213 p_new.p_s32 = &cs->controls[i].value;
3214 ret = validate_new(ctrl, p_new);
3215 if (ret)
3216 return ret;
3217 }
3218 return 0;
3219 }
3220
3221 /* Obtain the current volatile values of an autocluster and mark them
3222 as new. */
update_from_auto_cluster(struct v4l2_ctrl * master)3223 static void update_from_auto_cluster(struct v4l2_ctrl *master)
3224 {
3225 int i;
3226
3227 for (i = 1; i < master->ncontrols; i++)
3228 cur_to_new(master->cluster[i]);
3229 if (!call_op(master, g_volatile_ctrl))
3230 for (i = 1; i < master->ncontrols; i++)
3231 if (master->cluster[i])
3232 master->cluster[i]->is_new = 1;
3233 }
3234
3235 /* Try or try-and-set controls */
try_set_ext_ctrls(struct v4l2_fh * fh,struct v4l2_ctrl_handler * hdl,struct v4l2_ext_controls * cs,bool set)3236 static int try_set_ext_ctrls(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
3237 struct v4l2_ext_controls *cs,
3238 bool set)
3239 {
3240 struct v4l2_ctrl_helper helper[4];
3241 struct v4l2_ctrl_helper *helpers = helper;
3242 unsigned i, j;
3243 int ret;
3244
3245 cs->error_idx = cs->count;
3246
3247 /* Default value cannot be changed */
3248 if (cs->which == V4L2_CTRL_WHICH_DEF_VAL)
3249 return -EINVAL;
3250
3251 cs->which = V4L2_CTRL_ID2WHICH(cs->which);
3252
3253 if (hdl == NULL)
3254 return -EINVAL;
3255
3256 if (cs->count == 0)
3257 return class_check(hdl, cs->which);
3258
3259 if (cs->count > ARRAY_SIZE(helper)) {
3260 helpers = kvmalloc_array(cs->count, sizeof(helper[0]),
3261 GFP_KERNEL);
3262 if (!helpers)
3263 return -ENOMEM;
3264 }
3265 ret = prepare_ext_ctrls(hdl, cs, helpers, false);
3266 if (!ret)
3267 ret = validate_ctrls(cs, helpers, set);
3268 if (ret && set)
3269 cs->error_idx = cs->count;
3270 for (i = 0; !ret && i < cs->count; i++) {
3271 struct v4l2_ctrl *master;
3272 u32 idx = i;
3273
3274 if (helpers[i].mref == NULL)
3275 continue;
3276
3277 cs->error_idx = i;
3278 master = helpers[i].mref->ctrl;
3279 v4l2_ctrl_lock(master);
3280
3281 /* Reset the 'is_new' flags of the cluster */
3282 for (j = 0; j < master->ncontrols; j++)
3283 if (master->cluster[j])
3284 master->cluster[j]->is_new = 0;
3285
3286 /* For volatile autoclusters that are currently in auto mode
3287 we need to discover if it will be set to manual mode.
3288 If so, then we have to copy the current volatile values
3289 first since those will become the new manual values (which
3290 may be overwritten by explicit new values from this set
3291 of controls). */
3292 if (master->is_auto && master->has_volatiles &&
3293 !is_cur_manual(master)) {
3294 /* Pick an initial non-manual value */
3295 s32 new_auto_val = master->manual_mode_value + 1;
3296 u32 tmp_idx = idx;
3297
3298 do {
3299 /* Check if the auto control is part of the
3300 list, and remember the new value. */
3301 if (helpers[tmp_idx].ctrl == master)
3302 new_auto_val = cs->controls[tmp_idx].value;
3303 tmp_idx = helpers[tmp_idx].next;
3304 } while (tmp_idx);
3305 /* If the new value == the manual value, then copy
3306 the current volatile values. */
3307 if (new_auto_val == master->manual_mode_value)
3308 update_from_auto_cluster(master);
3309 }
3310
3311 /* Copy the new caller-supplied control values.
3312 user_to_new() sets 'is_new' to 1. */
3313 do {
3314 struct v4l2_ctrl *ctrl = helpers[idx].ctrl;
3315
3316 ret = user_to_new(cs->controls + idx, ctrl);
3317 if (!ret && ctrl->is_ptr)
3318 ret = validate_new(ctrl, ctrl->p_new);
3319 idx = helpers[idx].next;
3320 } while (!ret && idx);
3321
3322 if (!ret)
3323 ret = try_or_set_cluster(fh, master, set, 0);
3324
3325 /* Copy the new values back to userspace. */
3326 if (!ret) {
3327 idx = i;
3328 do {
3329 ret = new_to_user(cs->controls + idx,
3330 helpers[idx].ctrl);
3331 idx = helpers[idx].next;
3332 } while (!ret && idx);
3333 }
3334 v4l2_ctrl_unlock(master);
3335 }
3336
3337 if (cs->count > ARRAY_SIZE(helper))
3338 kvfree(helpers);
3339 return ret;
3340 }
3341
v4l2_try_ext_ctrls(struct v4l2_ctrl_handler * hdl,struct v4l2_ext_controls * cs)3342 int v4l2_try_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *cs)
3343 {
3344 return try_set_ext_ctrls(NULL, hdl, cs, false);
3345 }
3346 EXPORT_SYMBOL(v4l2_try_ext_ctrls);
3347
v4l2_s_ext_ctrls(struct v4l2_fh * fh,struct v4l2_ctrl_handler * hdl,struct v4l2_ext_controls * cs)3348 int v4l2_s_ext_ctrls(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
3349 struct v4l2_ext_controls *cs)
3350 {
3351 return try_set_ext_ctrls(fh, hdl, cs, true);
3352 }
3353 EXPORT_SYMBOL(v4l2_s_ext_ctrls);
3354
3355 /* Helper function for VIDIOC_S_CTRL compatibility */
set_ctrl(struct v4l2_fh * fh,struct v4l2_ctrl * ctrl,u32 ch_flags)3356 static int set_ctrl(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, u32 ch_flags)
3357 {
3358 struct v4l2_ctrl *master = ctrl->cluster[0];
3359 int ret;
3360 int i;
3361
3362 /* Reset the 'is_new' flags of the cluster */
3363 for (i = 0; i < master->ncontrols; i++)
3364 if (master->cluster[i])
3365 master->cluster[i]->is_new = 0;
3366
3367 ret = validate_new(ctrl, ctrl->p_new);
3368 if (ret)
3369 return ret;
3370
3371 /* For autoclusters with volatiles that are switched from auto to
3372 manual mode we have to update the current volatile values since
3373 those will become the initial manual values after such a switch. */
3374 if (master->is_auto && master->has_volatiles && ctrl == master &&
3375 !is_cur_manual(master) && ctrl->val == master->manual_mode_value)
3376 update_from_auto_cluster(master);
3377
3378 ctrl->is_new = 1;
3379 return try_or_set_cluster(fh, master, true, ch_flags);
3380 }
3381
3382 /* Helper function for VIDIOC_S_CTRL compatibility */
set_ctrl_lock(struct v4l2_fh * fh,struct v4l2_ctrl * ctrl,struct v4l2_ext_control * c)3383 static int set_ctrl_lock(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl,
3384 struct v4l2_ext_control *c)
3385 {
3386 int ret;
3387
3388 v4l2_ctrl_lock(ctrl);
3389 user_to_new(c, ctrl);
3390 ret = set_ctrl(fh, ctrl, 0);
3391 if (!ret)
3392 cur_to_user(c, ctrl);
3393 v4l2_ctrl_unlock(ctrl);
3394 return ret;
3395 }
3396
v4l2_s_ctrl(struct v4l2_fh * fh,struct v4l2_ctrl_handler * hdl,struct v4l2_control * control)3397 int v4l2_s_ctrl(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
3398 struct v4l2_control *control)
3399 {
3400 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, control->id);
3401 struct v4l2_ext_control c = { control->id };
3402 int ret;
3403
3404 if (ctrl == NULL || !ctrl->is_int)
3405 return -EINVAL;
3406
3407 if (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY)
3408 return -EACCES;
3409
3410 c.value = control->value;
3411 ret = set_ctrl_lock(fh, ctrl, &c);
3412 control->value = c.value;
3413 return ret;
3414 }
3415 EXPORT_SYMBOL(v4l2_s_ctrl);
3416
__v4l2_ctrl_s_ctrl(struct v4l2_ctrl * ctrl,s32 val)3417 int __v4l2_ctrl_s_ctrl(struct v4l2_ctrl *ctrl, s32 val)
3418 {
3419 lockdep_assert_held(ctrl->handler->lock);
3420
3421 /* It's a driver bug if this happens. */
3422 WARN_ON(!ctrl->is_int);
3423 ctrl->val = val;
3424 return set_ctrl(NULL, ctrl, 0);
3425 }
3426 EXPORT_SYMBOL(__v4l2_ctrl_s_ctrl);
3427
__v4l2_ctrl_s_ctrl_int64(struct v4l2_ctrl * ctrl,s64 val)3428 int __v4l2_ctrl_s_ctrl_int64(struct v4l2_ctrl *ctrl, s64 val)
3429 {
3430 lockdep_assert_held(ctrl->handler->lock);
3431
3432 /* It's a driver bug if this happens. */
3433 WARN_ON(ctrl->is_ptr || ctrl->type != V4L2_CTRL_TYPE_INTEGER64);
3434 *ctrl->p_new.p_s64 = val;
3435 return set_ctrl(NULL, ctrl, 0);
3436 }
3437 EXPORT_SYMBOL(__v4l2_ctrl_s_ctrl_int64);
3438
__v4l2_ctrl_s_ctrl_string(struct v4l2_ctrl * ctrl,const char * s)3439 int __v4l2_ctrl_s_ctrl_string(struct v4l2_ctrl *ctrl, const char *s)
3440 {
3441 lockdep_assert_held(ctrl->handler->lock);
3442
3443 /* It's a driver bug if this happens. */
3444 WARN_ON(ctrl->type != V4L2_CTRL_TYPE_STRING);
3445 strlcpy(ctrl->p_new.p_char, s, ctrl->maximum + 1);
3446 return set_ctrl(NULL, ctrl, 0);
3447 }
3448 EXPORT_SYMBOL(__v4l2_ctrl_s_ctrl_string);
3449
v4l2_ctrl_notify(struct v4l2_ctrl * ctrl,v4l2_ctrl_notify_fnc notify,void * priv)3450 void v4l2_ctrl_notify(struct v4l2_ctrl *ctrl, v4l2_ctrl_notify_fnc notify, void *priv)
3451 {
3452 if (ctrl == NULL)
3453 return;
3454 if (notify == NULL) {
3455 ctrl->call_notify = 0;
3456 return;
3457 }
3458 if (WARN_ON(ctrl->handler->notify && ctrl->handler->notify != notify))
3459 return;
3460 ctrl->handler->notify = notify;
3461 ctrl->handler->notify_priv = priv;
3462 ctrl->call_notify = 1;
3463 }
3464 EXPORT_SYMBOL(v4l2_ctrl_notify);
3465
__v4l2_ctrl_modify_range(struct v4l2_ctrl * ctrl,s64 min,s64 max,u64 step,s64 def)3466 int __v4l2_ctrl_modify_range(struct v4l2_ctrl *ctrl,
3467 s64 min, s64 max, u64 step, s64 def)
3468 {
3469 bool value_changed;
3470 bool range_changed = false;
3471 int ret;
3472
3473 lockdep_assert_held(ctrl->handler->lock);
3474
3475 switch (ctrl->type) {
3476 case V4L2_CTRL_TYPE_INTEGER:
3477 case V4L2_CTRL_TYPE_INTEGER64:
3478 case V4L2_CTRL_TYPE_BOOLEAN:
3479 case V4L2_CTRL_TYPE_MENU:
3480 case V4L2_CTRL_TYPE_INTEGER_MENU:
3481 case V4L2_CTRL_TYPE_BITMASK:
3482 case V4L2_CTRL_TYPE_U8:
3483 case V4L2_CTRL_TYPE_U16:
3484 case V4L2_CTRL_TYPE_U32:
3485 if (ctrl->is_array)
3486 return -EINVAL;
3487 ret = check_range(ctrl->type, min, max, step, def);
3488 if (ret)
3489 return ret;
3490 break;
3491 default:
3492 return -EINVAL;
3493 }
3494 if ((ctrl->minimum != min) || (ctrl->maximum != max) ||
3495 (ctrl->step != step) || ctrl->default_value != def) {
3496 range_changed = true;
3497 ctrl->minimum = min;
3498 ctrl->maximum = max;
3499 ctrl->step = step;
3500 ctrl->default_value = def;
3501 }
3502 cur_to_new(ctrl);
3503 if (validate_new(ctrl, ctrl->p_new)) {
3504 if (ctrl->type == V4L2_CTRL_TYPE_INTEGER64)
3505 *ctrl->p_new.p_s64 = def;
3506 else
3507 *ctrl->p_new.p_s32 = def;
3508 }
3509
3510 if (ctrl->type == V4L2_CTRL_TYPE_INTEGER64)
3511 value_changed = *ctrl->p_new.p_s64 != *ctrl->p_cur.p_s64;
3512 else
3513 value_changed = *ctrl->p_new.p_s32 != *ctrl->p_cur.p_s32;
3514 if (value_changed)
3515 ret = set_ctrl(NULL, ctrl, V4L2_EVENT_CTRL_CH_RANGE);
3516 else if (range_changed)
3517 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_RANGE);
3518 return ret;
3519 }
3520 EXPORT_SYMBOL(__v4l2_ctrl_modify_range);
3521
v4l2_ctrl_add_event(struct v4l2_subscribed_event * sev,unsigned elems)3522 static int v4l2_ctrl_add_event(struct v4l2_subscribed_event *sev, unsigned elems)
3523 {
3524 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(sev->fh->ctrl_handler, sev->id);
3525
3526 if (ctrl == NULL)
3527 return -EINVAL;
3528
3529 v4l2_ctrl_lock(ctrl);
3530 list_add_tail(&sev->node, &ctrl->ev_subs);
3531 if (ctrl->type != V4L2_CTRL_TYPE_CTRL_CLASS &&
3532 (sev->flags & V4L2_EVENT_SUB_FL_SEND_INITIAL)) {
3533 struct v4l2_event ev;
3534 u32 changes = V4L2_EVENT_CTRL_CH_FLAGS;
3535
3536 if (!(ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY))
3537 changes |= V4L2_EVENT_CTRL_CH_VALUE;
3538 fill_event(&ev, ctrl, changes);
3539 /* Mark the queue as active, allowing this initial
3540 event to be accepted. */
3541 sev->elems = elems;
3542 v4l2_event_queue_fh(sev->fh, &ev);
3543 }
3544 v4l2_ctrl_unlock(ctrl);
3545 return 0;
3546 }
3547
v4l2_ctrl_del_event(struct v4l2_subscribed_event * sev)3548 static void v4l2_ctrl_del_event(struct v4l2_subscribed_event *sev)
3549 {
3550 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(sev->fh->ctrl_handler, sev->id);
3551
3552 if (ctrl == NULL)
3553 return;
3554
3555 v4l2_ctrl_lock(ctrl);
3556 list_del(&sev->node);
3557 v4l2_ctrl_unlock(ctrl);
3558 }
3559
v4l2_ctrl_replace(struct v4l2_event * old,const struct v4l2_event * new)3560 void v4l2_ctrl_replace(struct v4l2_event *old, const struct v4l2_event *new)
3561 {
3562 u32 old_changes = old->u.ctrl.changes;
3563
3564 old->u.ctrl = new->u.ctrl;
3565 old->u.ctrl.changes |= old_changes;
3566 }
3567 EXPORT_SYMBOL(v4l2_ctrl_replace);
3568
v4l2_ctrl_merge(const struct v4l2_event * old,struct v4l2_event * new)3569 void v4l2_ctrl_merge(const struct v4l2_event *old, struct v4l2_event *new)
3570 {
3571 new->u.ctrl.changes |= old->u.ctrl.changes;
3572 }
3573 EXPORT_SYMBOL(v4l2_ctrl_merge);
3574
3575 const struct v4l2_subscribed_event_ops v4l2_ctrl_sub_ev_ops = {
3576 .add = v4l2_ctrl_add_event,
3577 .del = v4l2_ctrl_del_event,
3578 .replace = v4l2_ctrl_replace,
3579 .merge = v4l2_ctrl_merge,
3580 };
3581 EXPORT_SYMBOL(v4l2_ctrl_sub_ev_ops);
3582
v4l2_ctrl_log_status(struct file * file,void * fh)3583 int v4l2_ctrl_log_status(struct file *file, void *fh)
3584 {
3585 struct video_device *vfd = video_devdata(file);
3586 struct v4l2_fh *vfh = file->private_data;
3587
3588 if (test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags) && vfd->v4l2_dev)
3589 v4l2_ctrl_handler_log_status(vfh->ctrl_handler,
3590 vfd->v4l2_dev->name);
3591 return 0;
3592 }
3593 EXPORT_SYMBOL(v4l2_ctrl_log_status);
3594
v4l2_ctrl_subscribe_event(struct v4l2_fh * fh,const struct v4l2_event_subscription * sub)3595 int v4l2_ctrl_subscribe_event(struct v4l2_fh *fh,
3596 const struct v4l2_event_subscription *sub)
3597 {
3598 if (sub->type == V4L2_EVENT_CTRL)
3599 return v4l2_event_subscribe(fh, sub, 0, &v4l2_ctrl_sub_ev_ops);
3600 return -EINVAL;
3601 }
3602 EXPORT_SYMBOL(v4l2_ctrl_subscribe_event);
3603
v4l2_ctrl_subdev_subscribe_event(struct v4l2_subdev * sd,struct v4l2_fh * fh,struct v4l2_event_subscription * sub)3604 int v4l2_ctrl_subdev_subscribe_event(struct v4l2_subdev *sd, struct v4l2_fh *fh,
3605 struct v4l2_event_subscription *sub)
3606 {
3607 if (!sd->ctrl_handler)
3608 return -EINVAL;
3609 return v4l2_ctrl_subscribe_event(fh, sub);
3610 }
3611 EXPORT_SYMBOL(v4l2_ctrl_subdev_subscribe_event);
3612
v4l2_ctrl_poll(struct file * file,struct poll_table_struct * wait)3613 __poll_t v4l2_ctrl_poll(struct file *file, struct poll_table_struct *wait)
3614 {
3615 struct v4l2_fh *fh = file->private_data;
3616
3617 if (v4l2_event_pending(fh))
3618 return EPOLLPRI;
3619 poll_wait(file, &fh->wait, wait);
3620 return 0;
3621 }
3622 EXPORT_SYMBOL(v4l2_ctrl_poll);
3623
