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 case V4L2_CID_DO_WHITE_BALANCE:
1149 *type = V4L2_CTRL_TYPE_BUTTON;
1150 *flags |= V4L2_CTRL_FLAG_WRITE_ONLY |
1151 V4L2_CTRL_FLAG_EXECUTE_ON_WRITE;
1152 *min = *max = *step = *def = 0;
1153 break;
1154 case V4L2_CID_POWER_LINE_FREQUENCY:
1155 case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ:
1156 case V4L2_CID_MPEG_AUDIO_ENCODING:
1157 case V4L2_CID_MPEG_AUDIO_L1_BITRATE:
1158 case V4L2_CID_MPEG_AUDIO_L2_BITRATE:
1159 case V4L2_CID_MPEG_AUDIO_L3_BITRATE:
1160 case V4L2_CID_MPEG_AUDIO_AC3_BITRATE:
1161 case V4L2_CID_MPEG_AUDIO_MODE:
1162 case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION:
1163 case V4L2_CID_MPEG_AUDIO_EMPHASIS:
1164 case V4L2_CID_MPEG_AUDIO_CRC:
1165 case V4L2_CID_MPEG_AUDIO_DEC_PLAYBACK:
1166 case V4L2_CID_MPEG_AUDIO_DEC_MULTILINGUAL_PLAYBACK:
1167 case V4L2_CID_MPEG_VIDEO_ENCODING:
1168 case V4L2_CID_MPEG_VIDEO_ASPECT:
1169 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
1170 case V4L2_CID_MPEG_STREAM_TYPE:
1171 case V4L2_CID_MPEG_STREAM_VBI_FMT:
1172 case V4L2_CID_EXPOSURE_AUTO:
1173 case V4L2_CID_AUTO_FOCUS_RANGE:
1174 case V4L2_CID_COLORFX:
1175 case V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE:
1176 case V4L2_CID_TUNE_PREEMPHASIS:
1177 case V4L2_CID_FLASH_LED_MODE:
1178 case V4L2_CID_FLASH_STROBE_SOURCE:
1179 case V4L2_CID_MPEG_VIDEO_HEADER_MODE:
1180 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE:
1181 case V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE:
1182 case V4L2_CID_MPEG_VIDEO_H264_LEVEL:
1183 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE:
1184 case V4L2_CID_MPEG_VIDEO_H264_PROFILE:
1185 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC:
1186 case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE:
1187 case V4L2_CID_MPEG_VIDEO_H264_FMO_MAP_TYPE:
1188 case V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL:
1189 case V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE:
1190 case V4L2_CID_JPEG_CHROMA_SUBSAMPLING:
1191 case V4L2_CID_ISO_SENSITIVITY_AUTO:
1192 case V4L2_CID_EXPOSURE_METERING:
1193 case V4L2_CID_SCENE_MODE:
1194 case V4L2_CID_DV_TX_MODE:
1195 case V4L2_CID_DV_TX_RGB_RANGE:
1196 case V4L2_CID_DV_TX_IT_CONTENT_TYPE:
1197 case V4L2_CID_DV_RX_RGB_RANGE:
1198 case V4L2_CID_DV_RX_IT_CONTENT_TYPE:
1199 case V4L2_CID_TEST_PATTERN:
1200 case V4L2_CID_DEINTERLACING_MODE:
1201 case V4L2_CID_TUNE_DEEMPHASIS:
1202 case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_SEL:
1203 case V4L2_CID_MPEG_VIDEO_VP8_PROFILE:
1204 case V4L2_CID_MPEG_VIDEO_VP9_PROFILE:
1205 case V4L2_CID_DETECT_MD_MODE:
1206 case V4L2_CID_MPEG_VIDEO_HEVC_PROFILE:
1207 case V4L2_CID_MPEG_VIDEO_HEVC_LEVEL:
1208 case V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_TYPE:
1209 case V4L2_CID_MPEG_VIDEO_HEVC_REFRESH_TYPE:
1210 case V4L2_CID_MPEG_VIDEO_HEVC_SIZE_OF_LENGTH_FIELD:
1211 case V4L2_CID_MPEG_VIDEO_HEVC_TIER:
1212 case V4L2_CID_MPEG_VIDEO_HEVC_LOOP_FILTER_MODE:
1213 *type = V4L2_CTRL_TYPE_MENU;
1214 break;
1215 case V4L2_CID_LINK_FREQ:
1216 *type = V4L2_CTRL_TYPE_INTEGER_MENU;
1217 break;
1218 case V4L2_CID_RDS_TX_PS_NAME:
1219 case V4L2_CID_RDS_TX_RADIO_TEXT:
1220 case V4L2_CID_RDS_RX_PS_NAME:
1221 case V4L2_CID_RDS_RX_RADIO_TEXT:
1222 *type = V4L2_CTRL_TYPE_STRING;
1223 break;
1224 case V4L2_CID_ISO_SENSITIVITY:
1225 case V4L2_CID_AUTO_EXPOSURE_BIAS:
1226 case V4L2_CID_MPEG_VIDEO_VPX_NUM_PARTITIONS:
1227 case V4L2_CID_MPEG_VIDEO_VPX_NUM_REF_FRAMES:
1228 *type = V4L2_CTRL_TYPE_INTEGER_MENU;
1229 break;
1230 case V4L2_CID_USER_CLASS:
1231 case V4L2_CID_CAMERA_CLASS:
1232 case V4L2_CID_MPEG_CLASS:
1233 case V4L2_CID_FM_TX_CLASS:
1234 case V4L2_CID_FLASH_CLASS:
1235 case V4L2_CID_JPEG_CLASS:
1236 case V4L2_CID_IMAGE_SOURCE_CLASS:
1237 case V4L2_CID_IMAGE_PROC_CLASS:
1238 case V4L2_CID_DV_CLASS:
1239 case V4L2_CID_FM_RX_CLASS:
1240 case V4L2_CID_RF_TUNER_CLASS:
1241 case V4L2_CID_DETECT_CLASS:
1242 *type = V4L2_CTRL_TYPE_CTRL_CLASS;
1243 /* You can neither read not write these */
1244 *flags |= V4L2_CTRL_FLAG_READ_ONLY | V4L2_CTRL_FLAG_WRITE_ONLY;
1245 *min = *max = *step = *def = 0;
1246 break;
1247 case V4L2_CID_BG_COLOR:
1248 *type = V4L2_CTRL_TYPE_INTEGER;
1249 *step = 1;
1250 *min = 0;
1251 /* Max is calculated as RGB888 that is 2^24 */
1252 *max = 0xFFFFFF;
1253 break;
1254 case V4L2_CID_FLASH_FAULT:
1255 case V4L2_CID_JPEG_ACTIVE_MARKER:
1256 case V4L2_CID_3A_LOCK:
1257 case V4L2_CID_AUTO_FOCUS_STATUS:
1258 case V4L2_CID_DV_TX_HOTPLUG:
1259 case V4L2_CID_DV_TX_RXSENSE:
1260 case V4L2_CID_DV_TX_EDID_PRESENT:
1261 case V4L2_CID_DV_RX_POWER_PRESENT:
1262 *type = V4L2_CTRL_TYPE_BITMASK;
1263 break;
1264 case V4L2_CID_MIN_BUFFERS_FOR_CAPTURE:
1265 case V4L2_CID_MIN_BUFFERS_FOR_OUTPUT:
1266 *type = V4L2_CTRL_TYPE_INTEGER;
1267 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
1268 break;
1269 case V4L2_CID_MPEG_VIDEO_DEC_PTS:
1270 *type = V4L2_CTRL_TYPE_INTEGER64;
1271 *flags |= V4L2_CTRL_FLAG_VOLATILE | V4L2_CTRL_FLAG_READ_ONLY;
1272 *min = *def = 0;
1273 *max = 0x1ffffffffLL;
1274 *step = 1;
1275 break;
1276 case V4L2_CID_MPEG_VIDEO_DEC_FRAME:
1277 *type = V4L2_CTRL_TYPE_INTEGER64;
1278 *flags |= V4L2_CTRL_FLAG_VOLATILE | V4L2_CTRL_FLAG_READ_ONLY;
1279 *min = *def = 0;
1280 *max = 0x7fffffffffffffffLL;
1281 *step = 1;
1282 break;
1283 case V4L2_CID_PIXEL_RATE:
1284 *type = V4L2_CTRL_TYPE_INTEGER64;
1285 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
1286 break;
1287 case V4L2_CID_DETECT_MD_REGION_GRID:
1288 *type = V4L2_CTRL_TYPE_U8;
1289 break;
1290 case V4L2_CID_DETECT_MD_THRESHOLD_GRID:
1291 *type = V4L2_CTRL_TYPE_U16;
1292 break;
1293 case V4L2_CID_RDS_TX_ALT_FREQS:
1294 *type = V4L2_CTRL_TYPE_U32;
1295 break;
1296 default:
1297 *type = V4L2_CTRL_TYPE_INTEGER;
1298 break;
1299 }
1300 switch (id) {
1301 case V4L2_CID_MPEG_AUDIO_ENCODING:
1302 case V4L2_CID_MPEG_AUDIO_MODE:
1303 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
1304 case V4L2_CID_MPEG_VIDEO_B_FRAMES:
1305 case V4L2_CID_MPEG_STREAM_TYPE:
1306 *flags |= V4L2_CTRL_FLAG_UPDATE;
1307 break;
1308 case V4L2_CID_AUDIO_VOLUME:
1309 case V4L2_CID_AUDIO_BALANCE:
1310 case V4L2_CID_AUDIO_BASS:
1311 case V4L2_CID_AUDIO_TREBLE:
1312 case V4L2_CID_BRIGHTNESS:
1313 case V4L2_CID_CONTRAST:
1314 case V4L2_CID_SATURATION:
1315 case V4L2_CID_HUE:
1316 case V4L2_CID_RED_BALANCE:
1317 case V4L2_CID_BLUE_BALANCE:
1318 case V4L2_CID_GAMMA:
1319 case V4L2_CID_SHARPNESS:
1320 case V4L2_CID_CHROMA_GAIN:
1321 case V4L2_CID_RDS_TX_DEVIATION:
1322 case V4L2_CID_AUDIO_LIMITER_RELEASE_TIME:
1323 case V4L2_CID_AUDIO_LIMITER_DEVIATION:
1324 case V4L2_CID_AUDIO_COMPRESSION_GAIN:
1325 case V4L2_CID_AUDIO_COMPRESSION_THRESHOLD:
1326 case V4L2_CID_AUDIO_COMPRESSION_ATTACK_TIME:
1327 case V4L2_CID_AUDIO_COMPRESSION_RELEASE_TIME:
1328 case V4L2_CID_PILOT_TONE_DEVIATION:
1329 case V4L2_CID_PILOT_TONE_FREQUENCY:
1330 case V4L2_CID_TUNE_POWER_LEVEL:
1331 case V4L2_CID_TUNE_ANTENNA_CAPACITOR:
1332 case V4L2_CID_RF_TUNER_RF_GAIN:
1333 case V4L2_CID_RF_TUNER_LNA_GAIN:
1334 case V4L2_CID_RF_TUNER_MIXER_GAIN:
1335 case V4L2_CID_RF_TUNER_IF_GAIN:
1336 case V4L2_CID_RF_TUNER_BANDWIDTH:
1337 case V4L2_CID_DETECT_MD_GLOBAL_THRESHOLD:
1338 *flags |= V4L2_CTRL_FLAG_SLIDER;
1339 break;
1340 case V4L2_CID_PAN_RELATIVE:
1341 case V4L2_CID_TILT_RELATIVE:
1342 case V4L2_CID_FOCUS_RELATIVE:
1343 case V4L2_CID_IRIS_RELATIVE:
1344 case V4L2_CID_ZOOM_RELATIVE:
1345 *flags |= V4L2_CTRL_FLAG_WRITE_ONLY |
1346 V4L2_CTRL_FLAG_EXECUTE_ON_WRITE;
1347 break;
1348 case V4L2_CID_FLASH_STROBE_STATUS:
1349 case V4L2_CID_AUTO_FOCUS_STATUS:
1350 case V4L2_CID_FLASH_READY:
1351 case V4L2_CID_DV_TX_HOTPLUG:
1352 case V4L2_CID_DV_TX_RXSENSE:
1353 case V4L2_CID_DV_TX_EDID_PRESENT:
1354 case V4L2_CID_DV_RX_POWER_PRESENT:
1355 case V4L2_CID_DV_RX_IT_CONTENT_TYPE:
1356 case V4L2_CID_RDS_RX_PTY:
1357 case V4L2_CID_RDS_RX_PS_NAME:
1358 case V4L2_CID_RDS_RX_RADIO_TEXT:
1359 case V4L2_CID_RDS_RX_TRAFFIC_ANNOUNCEMENT:
1360 case V4L2_CID_RDS_RX_TRAFFIC_PROGRAM:
1361 case V4L2_CID_RDS_RX_MUSIC_SPEECH:
1362 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
1363 break;
1364 case V4L2_CID_RF_TUNER_PLL_LOCK:
1365 *flags |= V4L2_CTRL_FLAG_VOLATILE;
1366 break;
1367 }
1368 }
1369 EXPORT_SYMBOL(v4l2_ctrl_fill);
1370
user_flags(const struct v4l2_ctrl * ctrl)1371 static u32 user_flags(const struct v4l2_ctrl *ctrl)
1372 {
1373 u32 flags = ctrl->flags;
1374
1375 if (ctrl->is_ptr)
1376 flags |= V4L2_CTRL_FLAG_HAS_PAYLOAD;
1377
1378 return flags;
1379 }
1380
fill_event(struct v4l2_event * ev,struct v4l2_ctrl * ctrl,u32 changes)1381 static void fill_event(struct v4l2_event *ev, struct v4l2_ctrl *ctrl, u32 changes)
1382 {
1383 memset(ev, 0, sizeof(*ev));
1384 ev->type = V4L2_EVENT_CTRL;
1385 ev->id = ctrl->id;
1386 ev->u.ctrl.changes = changes;
1387 ev->u.ctrl.type = ctrl->type;
1388 ev->u.ctrl.flags = user_flags(ctrl);
1389 if (ctrl->is_ptr)
1390 ev->u.ctrl.value64 = 0;
1391 else
1392 ev->u.ctrl.value64 = *ctrl->p_cur.p_s64;
1393 ev->u.ctrl.minimum = ctrl->minimum;
1394 ev->u.ctrl.maximum = ctrl->maximum;
1395 if (ctrl->type == V4L2_CTRL_TYPE_MENU
1396 || ctrl->type == V4L2_CTRL_TYPE_INTEGER_MENU)
1397 ev->u.ctrl.step = 1;
1398 else
1399 ev->u.ctrl.step = ctrl->step;
1400 ev->u.ctrl.default_value = ctrl->default_value;
1401 }
1402
send_event(struct v4l2_fh * fh,struct v4l2_ctrl * ctrl,u32 changes)1403 static void send_event(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, u32 changes)
1404 {
1405 struct v4l2_event ev;
1406 struct v4l2_subscribed_event *sev;
1407
1408 if (list_empty(&ctrl->ev_subs))
1409 return;
1410 fill_event(&ev, ctrl, changes);
1411
1412 list_for_each_entry(sev, &ctrl->ev_subs, node)
1413 if (sev->fh != fh ||
1414 (sev->flags & V4L2_EVENT_SUB_FL_ALLOW_FEEDBACK))
1415 v4l2_event_queue_fh(sev->fh, &ev);
1416 }
1417
std_equal(const struct v4l2_ctrl * ctrl,u32 idx,union v4l2_ctrl_ptr ptr1,union v4l2_ctrl_ptr ptr2)1418 static bool std_equal(const struct v4l2_ctrl *ctrl, u32 idx,
1419 union v4l2_ctrl_ptr ptr1,
1420 union v4l2_ctrl_ptr ptr2)
1421 {
1422 switch (ctrl->type) {
1423 case V4L2_CTRL_TYPE_BUTTON:
1424 return false;
1425 case V4L2_CTRL_TYPE_STRING:
1426 idx *= ctrl->elem_size;
1427 /* strings are always 0-terminated */
1428 return !strcmp(ptr1.p_char + idx, ptr2.p_char + idx);
1429 case V4L2_CTRL_TYPE_INTEGER64:
1430 return ptr1.p_s64[idx] == ptr2.p_s64[idx];
1431 case V4L2_CTRL_TYPE_U8:
1432 return ptr1.p_u8[idx] == ptr2.p_u8[idx];
1433 case V4L2_CTRL_TYPE_U16:
1434 return ptr1.p_u16[idx] == ptr2.p_u16[idx];
1435 case V4L2_CTRL_TYPE_U32:
1436 return ptr1.p_u32[idx] == ptr2.p_u32[idx];
1437 default:
1438 if (ctrl->is_int)
1439 return ptr1.p_s32[idx] == ptr2.p_s32[idx];
1440 idx *= ctrl->elem_size;
1441 return !memcmp(ptr1.p + idx, ptr2.p + idx, ctrl->elem_size);
1442 }
1443 }
1444
std_init(const struct v4l2_ctrl * ctrl,u32 idx,union v4l2_ctrl_ptr ptr)1445 static void std_init(const struct v4l2_ctrl *ctrl, u32 idx,
1446 union v4l2_ctrl_ptr ptr)
1447 {
1448 switch (ctrl->type) {
1449 case V4L2_CTRL_TYPE_STRING:
1450 idx *= ctrl->elem_size;
1451 memset(ptr.p_char + idx, ' ', ctrl->minimum);
1452 ptr.p_char[idx + ctrl->minimum] = '\0';
1453 break;
1454 case V4L2_CTRL_TYPE_INTEGER64:
1455 ptr.p_s64[idx] = ctrl->default_value;
1456 break;
1457 case V4L2_CTRL_TYPE_INTEGER:
1458 case V4L2_CTRL_TYPE_INTEGER_MENU:
1459 case V4L2_CTRL_TYPE_MENU:
1460 case V4L2_CTRL_TYPE_BITMASK:
1461 case V4L2_CTRL_TYPE_BOOLEAN:
1462 ptr.p_s32[idx] = ctrl->default_value;
1463 break;
1464 case V4L2_CTRL_TYPE_U8:
1465 ptr.p_u8[idx] = ctrl->default_value;
1466 break;
1467 case V4L2_CTRL_TYPE_U16:
1468 ptr.p_u16[idx] = ctrl->default_value;
1469 break;
1470 case V4L2_CTRL_TYPE_U32:
1471 ptr.p_u32[idx] = ctrl->default_value;
1472 break;
1473 default:
1474 idx *= ctrl->elem_size;
1475 memset(ptr.p + idx, 0, ctrl->elem_size);
1476 break;
1477 }
1478 }
1479
std_log(const struct v4l2_ctrl * ctrl)1480 static void std_log(const struct v4l2_ctrl *ctrl)
1481 {
1482 union v4l2_ctrl_ptr ptr = ctrl->p_cur;
1483
1484 if (ctrl->is_array) {
1485 unsigned i;
1486
1487 for (i = 0; i < ctrl->nr_of_dims; i++)
1488 pr_cont("[%u]", ctrl->dims[i]);
1489 pr_cont(" ");
1490 }
1491
1492 switch (ctrl->type) {
1493 case V4L2_CTRL_TYPE_INTEGER:
1494 pr_cont("%d", *ptr.p_s32);
1495 break;
1496 case V4L2_CTRL_TYPE_BOOLEAN:
1497 pr_cont("%s", *ptr.p_s32 ? "true" : "false");
1498 break;
1499 case V4L2_CTRL_TYPE_MENU:
1500 pr_cont("%s", ctrl->qmenu[*ptr.p_s32]);
1501 break;
1502 case V4L2_CTRL_TYPE_INTEGER_MENU:
1503 pr_cont("%lld", ctrl->qmenu_int[*ptr.p_s32]);
1504 break;
1505 case V4L2_CTRL_TYPE_BITMASK:
1506 pr_cont("0x%08x", *ptr.p_s32);
1507 break;
1508 case V4L2_CTRL_TYPE_INTEGER64:
1509 pr_cont("%lld", *ptr.p_s64);
1510 break;
1511 case V4L2_CTRL_TYPE_STRING:
1512 pr_cont("%s", ptr.p_char);
1513 break;
1514 case V4L2_CTRL_TYPE_U8:
1515 pr_cont("%u", (unsigned)*ptr.p_u8);
1516 break;
1517 case V4L2_CTRL_TYPE_U16:
1518 pr_cont("%u", (unsigned)*ptr.p_u16);
1519 break;
1520 case V4L2_CTRL_TYPE_U32:
1521 pr_cont("%u", (unsigned)*ptr.p_u32);
1522 break;
1523 default:
1524 pr_cont("unknown type %d", ctrl->type);
1525 break;
1526 }
1527 }
1528
1529 /*
1530 * Round towards the closest legal value. Be careful when we are
1531 * close to the maximum range of the control type to prevent
1532 * wrap-arounds.
1533 */
1534 #define ROUND_TO_RANGE(val, offset_type, ctrl) \
1535 ({ \
1536 offset_type offset; \
1537 if ((ctrl)->maximum >= 0 && \
1538 val >= (ctrl)->maximum - (s32)((ctrl)->step / 2)) \
1539 val = (ctrl)->maximum; \
1540 else \
1541 val += (s32)((ctrl)->step / 2); \
1542 val = clamp_t(typeof(val), val, \
1543 (ctrl)->minimum, (ctrl)->maximum); \
1544 offset = (val) - (ctrl)->minimum; \
1545 offset = (ctrl)->step * (offset / (u32)(ctrl)->step); \
1546 val = (ctrl)->minimum + offset; \
1547 0; \
1548 })
1549
1550 /* Validate a new control */
std_validate(const struct v4l2_ctrl * ctrl,u32 idx,union v4l2_ctrl_ptr ptr)1551 static int std_validate(const struct v4l2_ctrl *ctrl, u32 idx,
1552 union v4l2_ctrl_ptr ptr)
1553 {
1554 size_t len;
1555 u64 offset;
1556 s64 val;
1557
1558 switch (ctrl->type) {
1559 case V4L2_CTRL_TYPE_INTEGER:
1560 return ROUND_TO_RANGE(ptr.p_s32[idx], u32, ctrl);
1561 case V4L2_CTRL_TYPE_INTEGER64:
1562 /*
1563 * We can't use the ROUND_TO_RANGE define here due to
1564 * the u64 divide that needs special care.
1565 */
1566 val = ptr.p_s64[idx];
1567 if (ctrl->maximum >= 0 && val >= ctrl->maximum - (s64)(ctrl->step / 2))
1568 val = ctrl->maximum;
1569 else
1570 val += (s64)(ctrl->step / 2);
1571 val = clamp_t(s64, val, ctrl->minimum, ctrl->maximum);
1572 offset = val - ctrl->minimum;
1573 do_div(offset, ctrl->step);
1574 ptr.p_s64[idx] = ctrl->minimum + offset * ctrl->step;
1575 return 0;
1576 case V4L2_CTRL_TYPE_U8:
1577 return ROUND_TO_RANGE(ptr.p_u8[idx], u8, ctrl);
1578 case V4L2_CTRL_TYPE_U16:
1579 return ROUND_TO_RANGE(ptr.p_u16[idx], u16, ctrl);
1580 case V4L2_CTRL_TYPE_U32:
1581 return ROUND_TO_RANGE(ptr.p_u32[idx], u32, ctrl);
1582
1583 case V4L2_CTRL_TYPE_BOOLEAN:
1584 ptr.p_s32[idx] = !!ptr.p_s32[idx];
1585 return 0;
1586
1587 case V4L2_CTRL_TYPE_MENU:
1588 case V4L2_CTRL_TYPE_INTEGER_MENU:
1589 if (ptr.p_s32[idx] < ctrl->minimum || ptr.p_s32[idx] > ctrl->maximum)
1590 return -ERANGE;
1591 if (ctrl->menu_skip_mask & (1 << ptr.p_s32[idx]))
1592 return -EINVAL;
1593 if (ctrl->type == V4L2_CTRL_TYPE_MENU &&
1594 ctrl->qmenu[ptr.p_s32[idx]][0] == '\0')
1595 return -EINVAL;
1596 return 0;
1597
1598 case V4L2_CTRL_TYPE_BITMASK:
1599 ptr.p_s32[idx] &= ctrl->maximum;
1600 return 0;
1601
1602 case V4L2_CTRL_TYPE_BUTTON:
1603 case V4L2_CTRL_TYPE_CTRL_CLASS:
1604 ptr.p_s32[idx] = 0;
1605 return 0;
1606
1607 case V4L2_CTRL_TYPE_STRING:
1608 idx *= ctrl->elem_size;
1609 len = strlen(ptr.p_char + idx);
1610 if (len < ctrl->minimum)
1611 return -ERANGE;
1612 if ((len - (u32)ctrl->minimum) % (u32)ctrl->step)
1613 return -ERANGE;
1614 return 0;
1615
1616 default:
1617 return -EINVAL;
1618 }
1619 }
1620
1621 static const struct v4l2_ctrl_type_ops std_type_ops = {
1622 .equal = std_equal,
1623 .init = std_init,
1624 .log = std_log,
1625 .validate = std_validate,
1626 };
1627
1628 /* 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)1629 static int ptr_to_user(struct v4l2_ext_control *c,
1630 struct v4l2_ctrl *ctrl,
1631 union v4l2_ctrl_ptr ptr)
1632 {
1633 u32 len;
1634
1635 if (ctrl->is_ptr && !ctrl->is_string)
1636 return copy_to_user(c->ptr, ptr.p, c->size) ?
1637 -EFAULT : 0;
1638
1639 switch (ctrl->type) {
1640 case V4L2_CTRL_TYPE_STRING:
1641 len = strlen(ptr.p_char);
1642 if (c->size < len + 1) {
1643 c->size = ctrl->elem_size;
1644 return -ENOSPC;
1645 }
1646 return copy_to_user(c->string, ptr.p_char, len + 1) ?
1647 -EFAULT : 0;
1648 case V4L2_CTRL_TYPE_INTEGER64:
1649 c->value64 = *ptr.p_s64;
1650 break;
1651 default:
1652 c->value = *ptr.p_s32;
1653 break;
1654 }
1655 return 0;
1656 }
1657
1658 /* Helper function: copy the current control value back to the caller */
cur_to_user(struct v4l2_ext_control * c,struct v4l2_ctrl * ctrl)1659 static int cur_to_user(struct v4l2_ext_control *c,
1660 struct v4l2_ctrl *ctrl)
1661 {
1662 return ptr_to_user(c, ctrl, ctrl->p_cur);
1663 }
1664
1665 /* Helper function: copy the new control value back to the caller */
new_to_user(struct v4l2_ext_control * c,struct v4l2_ctrl * ctrl)1666 static int new_to_user(struct v4l2_ext_control *c,
1667 struct v4l2_ctrl *ctrl)
1668 {
1669 return ptr_to_user(c, ctrl, ctrl->p_new);
1670 }
1671
1672 /* Helper function: copy the initial control value back to the caller */
def_to_user(struct v4l2_ext_control * c,struct v4l2_ctrl * ctrl)1673 static int def_to_user(struct v4l2_ext_control *c, struct v4l2_ctrl *ctrl)
1674 {
1675 int idx;
1676
1677 for (idx = 0; idx < ctrl->elems; idx++)
1678 ctrl->type_ops->init(ctrl, idx, ctrl->p_new);
1679
1680 return ptr_to_user(c, ctrl, ctrl->p_new);
1681 }
1682
1683 /* 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)1684 static int user_to_ptr(struct v4l2_ext_control *c,
1685 struct v4l2_ctrl *ctrl,
1686 union v4l2_ctrl_ptr ptr)
1687 {
1688 int ret;
1689 u32 size;
1690
1691 ctrl->is_new = 1;
1692 if (ctrl->is_ptr && !ctrl->is_string) {
1693 unsigned idx;
1694
1695 ret = copy_from_user(ptr.p, c->ptr, c->size) ? -EFAULT : 0;
1696 if (ret || !ctrl->is_array)
1697 return ret;
1698 for (idx = c->size / ctrl->elem_size; idx < ctrl->elems; idx++)
1699 ctrl->type_ops->init(ctrl, idx, ptr);
1700 return 0;
1701 }
1702
1703 switch (ctrl->type) {
1704 case V4L2_CTRL_TYPE_INTEGER64:
1705 *ptr.p_s64 = c->value64;
1706 break;
1707 case V4L2_CTRL_TYPE_STRING:
1708 size = c->size;
1709 if (size == 0)
1710 return -ERANGE;
1711 if (size > ctrl->maximum + 1)
1712 size = ctrl->maximum + 1;
1713 ret = copy_from_user(ptr.p_char, c->string, size) ? -EFAULT : 0;
1714 if (!ret) {
1715 char last = ptr.p_char[size - 1];
1716
1717 ptr.p_char[size - 1] = 0;
1718 /* If the string was longer than ctrl->maximum,
1719 then return an error. */
1720 if (strlen(ptr.p_char) == ctrl->maximum && last)
1721 return -ERANGE;
1722 }
1723 return ret;
1724 default:
1725 *ptr.p_s32 = c->value;
1726 break;
1727 }
1728 return 0;
1729 }
1730
1731 /* Helper function: copy the caller-provider value as the new control value */
user_to_new(struct v4l2_ext_control * c,struct v4l2_ctrl * ctrl)1732 static int user_to_new(struct v4l2_ext_control *c,
1733 struct v4l2_ctrl *ctrl)
1734 {
1735 return user_to_ptr(c, ctrl, ctrl->p_new);
1736 }
1737
1738 /* Copy the one value to another. */
ptr_to_ptr(struct v4l2_ctrl * ctrl,union v4l2_ctrl_ptr from,union v4l2_ctrl_ptr to)1739 static void ptr_to_ptr(struct v4l2_ctrl *ctrl,
1740 union v4l2_ctrl_ptr from, union v4l2_ctrl_ptr to)
1741 {
1742 if (ctrl == NULL)
1743 return;
1744 memcpy(to.p, from.p, ctrl->elems * ctrl->elem_size);
1745 }
1746
1747 /* Copy the new value to the current value. */
new_to_cur(struct v4l2_fh * fh,struct v4l2_ctrl * ctrl,u32 ch_flags)1748 static void new_to_cur(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, u32 ch_flags)
1749 {
1750 bool changed;
1751
1752 if (ctrl == NULL)
1753 return;
1754
1755 /* has_changed is set by cluster_changed */
1756 changed = ctrl->has_changed;
1757 if (changed)
1758 ptr_to_ptr(ctrl, ctrl->p_new, ctrl->p_cur);
1759
1760 if (ch_flags & V4L2_EVENT_CTRL_CH_FLAGS) {
1761 /* Note: CH_FLAGS is only set for auto clusters. */
1762 ctrl->flags &=
1763 ~(V4L2_CTRL_FLAG_INACTIVE | V4L2_CTRL_FLAG_VOLATILE);
1764 if (!is_cur_manual(ctrl->cluster[0])) {
1765 ctrl->flags |= V4L2_CTRL_FLAG_INACTIVE;
1766 if (ctrl->cluster[0]->has_volatiles)
1767 ctrl->flags |= V4L2_CTRL_FLAG_VOLATILE;
1768 }
1769 fh = NULL;
1770 }
1771 if (changed || ch_flags) {
1772 /* If a control was changed that was not one of the controls
1773 modified by the application, then send the event to all. */
1774 if (!ctrl->is_new)
1775 fh = NULL;
1776 send_event(fh, ctrl,
1777 (changed ? V4L2_EVENT_CTRL_CH_VALUE : 0) | ch_flags);
1778 if (ctrl->call_notify && changed && ctrl->handler->notify)
1779 ctrl->handler->notify(ctrl, ctrl->handler->notify_priv);
1780 }
1781 }
1782
1783 /* Copy the current value to the new value */
cur_to_new(struct v4l2_ctrl * ctrl)1784 static void cur_to_new(struct v4l2_ctrl *ctrl)
1785 {
1786 if (ctrl == NULL)
1787 return;
1788 ptr_to_ptr(ctrl, ctrl->p_cur, ctrl->p_new);
1789 }
1790
1791 /* Return non-zero if one or more of the controls in the cluster has a new
1792 value that differs from the current value. */
cluster_changed(struct v4l2_ctrl * master)1793 static int cluster_changed(struct v4l2_ctrl *master)
1794 {
1795 bool changed = false;
1796 unsigned idx;
1797 int i;
1798
1799 for (i = 0; i < master->ncontrols; i++) {
1800 struct v4l2_ctrl *ctrl = master->cluster[i];
1801 bool ctrl_changed = false;
1802
1803 if (ctrl == NULL)
1804 continue;
1805
1806 if (ctrl->flags & V4L2_CTRL_FLAG_EXECUTE_ON_WRITE)
1807 changed = ctrl_changed = true;
1808
1809 /*
1810 * Set has_changed to false to avoid generating
1811 * the event V4L2_EVENT_CTRL_CH_VALUE
1812 */
1813 if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE) {
1814 ctrl->has_changed = false;
1815 continue;
1816 }
1817
1818 for (idx = 0; !ctrl_changed && idx < ctrl->elems; idx++)
1819 ctrl_changed = !ctrl->type_ops->equal(ctrl, idx,
1820 ctrl->p_cur, ctrl->p_new);
1821 ctrl->has_changed = ctrl_changed;
1822 changed |= ctrl->has_changed;
1823 }
1824 return changed;
1825 }
1826
1827 /* Control range checking */
check_range(enum v4l2_ctrl_type type,s64 min,s64 max,u64 step,s64 def)1828 static int check_range(enum v4l2_ctrl_type type,
1829 s64 min, s64 max, u64 step, s64 def)
1830 {
1831 switch (type) {
1832 case V4L2_CTRL_TYPE_BOOLEAN:
1833 if (step != 1 || max > 1 || min < 0)
1834 return -ERANGE;
1835 /* fall through */
1836 case V4L2_CTRL_TYPE_U8:
1837 case V4L2_CTRL_TYPE_U16:
1838 case V4L2_CTRL_TYPE_U32:
1839 case V4L2_CTRL_TYPE_INTEGER:
1840 case V4L2_CTRL_TYPE_INTEGER64:
1841 if (step == 0 || min > max || def < min || def > max)
1842 return -ERANGE;
1843 return 0;
1844 case V4L2_CTRL_TYPE_BITMASK:
1845 if (step || min || !max || (def & ~max))
1846 return -ERANGE;
1847 return 0;
1848 case V4L2_CTRL_TYPE_MENU:
1849 case V4L2_CTRL_TYPE_INTEGER_MENU:
1850 if (min > max || def < min || def > max)
1851 return -ERANGE;
1852 /* Note: step == menu_skip_mask for menu controls.
1853 So here we check if the default value is masked out. */
1854 if (step && ((1 << def) & step))
1855 return -EINVAL;
1856 return 0;
1857 case V4L2_CTRL_TYPE_STRING:
1858 if (min > max || min < 0 || step < 1 || def)
1859 return -ERANGE;
1860 return 0;
1861 default:
1862 return 0;
1863 }
1864 }
1865
1866 /* Validate a new control */
validate_new(const struct v4l2_ctrl * ctrl,union v4l2_ctrl_ptr p_new)1867 static int validate_new(const struct v4l2_ctrl *ctrl, union v4l2_ctrl_ptr p_new)
1868 {
1869 unsigned idx;
1870 int err = 0;
1871
1872 for (idx = 0; !err && idx < ctrl->elems; idx++)
1873 err = ctrl->type_ops->validate(ctrl, idx, p_new);
1874 return err;
1875 }
1876
node2id(struct list_head * node)1877 static inline u32 node2id(struct list_head *node)
1878 {
1879 return list_entry(node, struct v4l2_ctrl_ref, node)->ctrl->id;
1880 }
1881
1882 /* Set the handler's error code if it wasn't set earlier already */
handler_set_err(struct v4l2_ctrl_handler * hdl,int err)1883 static inline int handler_set_err(struct v4l2_ctrl_handler *hdl, int err)
1884 {
1885 if (hdl->error == 0)
1886 hdl->error = err;
1887 return err;
1888 }
1889
1890 /* 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)1891 int v4l2_ctrl_handler_init_class(struct v4l2_ctrl_handler *hdl,
1892 unsigned nr_of_controls_hint,
1893 struct lock_class_key *key, const char *name)
1894 {
1895 mutex_init(&hdl->_lock);
1896 hdl->lock = &hdl->_lock;
1897 lockdep_set_class_and_name(hdl->lock, key, name);
1898 INIT_LIST_HEAD(&hdl->ctrls);
1899 INIT_LIST_HEAD(&hdl->ctrl_refs);
1900 hdl->nr_of_buckets = 1 + nr_of_controls_hint / 8;
1901 hdl->buckets = kvmalloc_array(hdl->nr_of_buckets,
1902 sizeof(hdl->buckets[0]),
1903 GFP_KERNEL | __GFP_ZERO);
1904 hdl->error = hdl->buckets ? 0 : -ENOMEM;
1905 return hdl->error;
1906 }
1907 EXPORT_SYMBOL(v4l2_ctrl_handler_init_class);
1908
1909 /* Free all controls and control refs */
v4l2_ctrl_handler_free(struct v4l2_ctrl_handler * hdl)1910 void v4l2_ctrl_handler_free(struct v4l2_ctrl_handler *hdl)
1911 {
1912 struct v4l2_ctrl_ref *ref, *next_ref;
1913 struct v4l2_ctrl *ctrl, *next_ctrl;
1914 struct v4l2_subscribed_event *sev, *next_sev;
1915
1916 if (hdl == NULL || hdl->buckets == NULL)
1917 return;
1918
1919 mutex_lock(hdl->lock);
1920 /* Free all nodes */
1921 list_for_each_entry_safe(ref, next_ref, &hdl->ctrl_refs, node) {
1922 list_del(&ref->node);
1923 kfree(ref);
1924 }
1925 /* Free all controls owned by the handler */
1926 list_for_each_entry_safe(ctrl, next_ctrl, &hdl->ctrls, node) {
1927 list_del(&ctrl->node);
1928 list_for_each_entry_safe(sev, next_sev, &ctrl->ev_subs, node)
1929 list_del(&sev->node);
1930 kvfree(ctrl);
1931 }
1932 kvfree(hdl->buckets);
1933 hdl->buckets = NULL;
1934 hdl->cached = NULL;
1935 hdl->error = 0;
1936 mutex_unlock(hdl->lock);
1937 mutex_destroy(&hdl->_lock);
1938 }
1939 EXPORT_SYMBOL(v4l2_ctrl_handler_free);
1940
1941 /* For backwards compatibility: V4L2_CID_PRIVATE_BASE should no longer
1942 be used except in G_CTRL, S_CTRL, QUERYCTRL and QUERYMENU when dealing
1943 with applications that do not use the NEXT_CTRL flag.
1944
1945 We just find the n-th private user control. It's O(N), but that should not
1946 be an issue in this particular case. */
find_private_ref(struct v4l2_ctrl_handler * hdl,u32 id)1947 static struct v4l2_ctrl_ref *find_private_ref(
1948 struct v4l2_ctrl_handler *hdl, u32 id)
1949 {
1950 struct v4l2_ctrl_ref *ref;
1951
1952 id -= V4L2_CID_PRIVATE_BASE;
1953 list_for_each_entry(ref, &hdl->ctrl_refs, node) {
1954 /* Search for private user controls that are compatible with
1955 VIDIOC_G/S_CTRL. */
1956 if (V4L2_CTRL_ID2WHICH(ref->ctrl->id) == V4L2_CTRL_CLASS_USER &&
1957 V4L2_CTRL_DRIVER_PRIV(ref->ctrl->id)) {
1958 if (!ref->ctrl->is_int)
1959 continue;
1960 if (id == 0)
1961 return ref;
1962 id--;
1963 }
1964 }
1965 return NULL;
1966 }
1967
1968 /* Find a control with the given ID. */
find_ref(struct v4l2_ctrl_handler * hdl,u32 id)1969 static struct v4l2_ctrl_ref *find_ref(struct v4l2_ctrl_handler *hdl, u32 id)
1970 {
1971 struct v4l2_ctrl_ref *ref;
1972 int bucket;
1973
1974 id &= V4L2_CTRL_ID_MASK;
1975
1976 /* Old-style private controls need special handling */
1977 if (id >= V4L2_CID_PRIVATE_BASE)
1978 return find_private_ref(hdl, id);
1979 bucket = id % hdl->nr_of_buckets;
1980
1981 /* Simple optimization: cache the last control found */
1982 if (hdl->cached && hdl->cached->ctrl->id == id)
1983 return hdl->cached;
1984
1985 /* Not in cache, search the hash */
1986 ref = hdl->buckets ? hdl->buckets[bucket] : NULL;
1987 while (ref && ref->ctrl->id != id)
1988 ref = ref->next;
1989
1990 if (ref)
1991 hdl->cached = ref; /* cache it! */
1992 return ref;
1993 }
1994
1995 /* Find a control with the given ID. Take the handler's lock first. */
find_ref_lock(struct v4l2_ctrl_handler * hdl,u32 id)1996 static struct v4l2_ctrl_ref *find_ref_lock(
1997 struct v4l2_ctrl_handler *hdl, u32 id)
1998 {
1999 struct v4l2_ctrl_ref *ref = NULL;
2000
2001 if (hdl) {
2002 mutex_lock(hdl->lock);
2003 ref = find_ref(hdl, id);
2004 mutex_unlock(hdl->lock);
2005 }
2006 return ref;
2007 }
2008
2009 /* Find a control with the given ID. */
v4l2_ctrl_find(struct v4l2_ctrl_handler * hdl,u32 id)2010 struct v4l2_ctrl *v4l2_ctrl_find(struct v4l2_ctrl_handler *hdl, u32 id)
2011 {
2012 struct v4l2_ctrl_ref *ref = find_ref_lock(hdl, id);
2013
2014 return ref ? ref->ctrl : NULL;
2015 }
2016 EXPORT_SYMBOL(v4l2_ctrl_find);
2017
2018 /* Allocate a new v4l2_ctrl_ref and hook it into the handler. */
handler_new_ref(struct v4l2_ctrl_handler * hdl,struct v4l2_ctrl * ctrl)2019 static int handler_new_ref(struct v4l2_ctrl_handler *hdl,
2020 struct v4l2_ctrl *ctrl)
2021 {
2022 struct v4l2_ctrl_ref *ref;
2023 struct v4l2_ctrl_ref *new_ref;
2024 u32 id = ctrl->id;
2025 u32 class_ctrl = V4L2_CTRL_ID2WHICH(id) | 1;
2026 int bucket = id % hdl->nr_of_buckets; /* which bucket to use */
2027
2028 /*
2029 * Automatically add the control class if it is not yet present and
2030 * the new control is not a compound control.
2031 */
2032 if (ctrl->type < V4L2_CTRL_COMPOUND_TYPES &&
2033 id != class_ctrl && find_ref_lock(hdl, class_ctrl) == NULL)
2034 if (!v4l2_ctrl_new_std(hdl, NULL, class_ctrl, 0, 0, 0, 0))
2035 return hdl->error;
2036
2037 if (hdl->error)
2038 return hdl->error;
2039
2040 new_ref = kzalloc(sizeof(*new_ref), GFP_KERNEL);
2041 if (!new_ref)
2042 return handler_set_err(hdl, -ENOMEM);
2043 new_ref->ctrl = ctrl;
2044 if (ctrl->handler == hdl) {
2045 /* By default each control starts in a cluster of its own.
2046 new_ref->ctrl is basically a cluster array with one
2047 element, so that's perfect to use as the cluster pointer.
2048 But only do this for the handler that owns the control. */
2049 ctrl->cluster = &new_ref->ctrl;
2050 ctrl->ncontrols = 1;
2051 }
2052
2053 INIT_LIST_HEAD(&new_ref->node);
2054
2055 mutex_lock(hdl->lock);
2056
2057 /* Add immediately at the end of the list if the list is empty, or if
2058 the last element in the list has a lower ID.
2059 This ensures that when elements are added in ascending order the
2060 insertion is an O(1) operation. */
2061 if (list_empty(&hdl->ctrl_refs) || id > node2id(hdl->ctrl_refs.prev)) {
2062 list_add_tail(&new_ref->node, &hdl->ctrl_refs);
2063 goto insert_in_hash;
2064 }
2065
2066 /* Find insert position in sorted list */
2067 list_for_each_entry(ref, &hdl->ctrl_refs, node) {
2068 if (ref->ctrl->id < id)
2069 continue;
2070 /* Don't add duplicates */
2071 if (ref->ctrl->id == id) {
2072 kfree(new_ref);
2073 goto unlock;
2074 }
2075 list_add(&new_ref->node, ref->node.prev);
2076 break;
2077 }
2078
2079 insert_in_hash:
2080 /* Insert the control node in the hash */
2081 new_ref->next = hdl->buckets[bucket];
2082 hdl->buckets[bucket] = new_ref;
2083
2084 unlock:
2085 mutex_unlock(hdl->lock);
2086 return 0;
2087 }
2088
2089 /* 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)2090 static struct v4l2_ctrl *v4l2_ctrl_new(struct v4l2_ctrl_handler *hdl,
2091 const struct v4l2_ctrl_ops *ops,
2092 const struct v4l2_ctrl_type_ops *type_ops,
2093 u32 id, const char *name, enum v4l2_ctrl_type type,
2094 s64 min, s64 max, u64 step, s64 def,
2095 const u32 dims[V4L2_CTRL_MAX_DIMS], u32 elem_size,
2096 u32 flags, const char * const *qmenu,
2097 const s64 *qmenu_int, void *priv)
2098 {
2099 struct v4l2_ctrl *ctrl;
2100 unsigned sz_extra;
2101 unsigned nr_of_dims = 0;
2102 unsigned elems = 1;
2103 bool is_array;
2104 unsigned tot_ctrl_size;
2105 unsigned idx;
2106 void *data;
2107 int err;
2108
2109 if (hdl->error)
2110 return NULL;
2111
2112 while (dims && dims[nr_of_dims]) {
2113 elems *= dims[nr_of_dims];
2114 nr_of_dims++;
2115 if (nr_of_dims == V4L2_CTRL_MAX_DIMS)
2116 break;
2117 }
2118 is_array = nr_of_dims > 0;
2119
2120 /* Prefill elem_size for all types handled by std_type_ops */
2121 switch (type) {
2122 case V4L2_CTRL_TYPE_INTEGER64:
2123 elem_size = sizeof(s64);
2124 break;
2125 case V4L2_CTRL_TYPE_STRING:
2126 elem_size = max + 1;
2127 break;
2128 case V4L2_CTRL_TYPE_U8:
2129 elem_size = sizeof(u8);
2130 break;
2131 case V4L2_CTRL_TYPE_U16:
2132 elem_size = sizeof(u16);
2133 break;
2134 case V4L2_CTRL_TYPE_U32:
2135 elem_size = sizeof(u32);
2136 break;
2137 default:
2138 if (type < V4L2_CTRL_COMPOUND_TYPES)
2139 elem_size = sizeof(s32);
2140 break;
2141 }
2142 tot_ctrl_size = elem_size * elems;
2143
2144 /* Sanity checks */
2145 if (id == 0 || name == NULL || !elem_size ||
2146 id >= V4L2_CID_PRIVATE_BASE ||
2147 (type == V4L2_CTRL_TYPE_MENU && qmenu == NULL) ||
2148 (type == V4L2_CTRL_TYPE_INTEGER_MENU && qmenu_int == NULL)) {
2149 handler_set_err(hdl, -ERANGE);
2150 return NULL;
2151 }
2152 err = check_range(type, min, max, step, def);
2153 if (err) {
2154 handler_set_err(hdl, err);
2155 return NULL;
2156 }
2157 if (is_array &&
2158 (type == V4L2_CTRL_TYPE_BUTTON ||
2159 type == V4L2_CTRL_TYPE_CTRL_CLASS)) {
2160 handler_set_err(hdl, -EINVAL);
2161 return NULL;
2162 }
2163
2164 sz_extra = 0;
2165 if (type == V4L2_CTRL_TYPE_BUTTON)
2166 flags |= V4L2_CTRL_FLAG_WRITE_ONLY |
2167 V4L2_CTRL_FLAG_EXECUTE_ON_WRITE;
2168 else if (type == V4L2_CTRL_TYPE_CTRL_CLASS)
2169 flags |= V4L2_CTRL_FLAG_READ_ONLY;
2170 else if (type == V4L2_CTRL_TYPE_INTEGER64 ||
2171 type == V4L2_CTRL_TYPE_STRING ||
2172 type >= V4L2_CTRL_COMPOUND_TYPES ||
2173 is_array)
2174 sz_extra += 2 * tot_ctrl_size;
2175
2176 ctrl = kvzalloc(sizeof(*ctrl) + sz_extra, GFP_KERNEL);
2177 if (ctrl == NULL) {
2178 handler_set_err(hdl, -ENOMEM);
2179 return NULL;
2180 }
2181
2182 INIT_LIST_HEAD(&ctrl->node);
2183 INIT_LIST_HEAD(&ctrl->ev_subs);
2184 ctrl->handler = hdl;
2185 ctrl->ops = ops;
2186 ctrl->type_ops = type_ops ? type_ops : &std_type_ops;
2187 ctrl->id = id;
2188 ctrl->name = name;
2189 ctrl->type = type;
2190 ctrl->flags = flags;
2191 ctrl->minimum = min;
2192 ctrl->maximum = max;
2193 ctrl->step = step;
2194 ctrl->default_value = def;
2195 ctrl->is_string = !is_array && type == V4L2_CTRL_TYPE_STRING;
2196 ctrl->is_ptr = is_array || type >= V4L2_CTRL_COMPOUND_TYPES || ctrl->is_string;
2197 ctrl->is_int = !ctrl->is_ptr && type != V4L2_CTRL_TYPE_INTEGER64;
2198 ctrl->is_array = is_array;
2199 ctrl->elems = elems;
2200 ctrl->nr_of_dims = nr_of_dims;
2201 if (nr_of_dims)
2202 memcpy(ctrl->dims, dims, nr_of_dims * sizeof(dims[0]));
2203 ctrl->elem_size = elem_size;
2204 if (type == V4L2_CTRL_TYPE_MENU)
2205 ctrl->qmenu = qmenu;
2206 else if (type == V4L2_CTRL_TYPE_INTEGER_MENU)
2207 ctrl->qmenu_int = qmenu_int;
2208 ctrl->priv = priv;
2209 ctrl->cur.val = ctrl->val = def;
2210 data = &ctrl[1];
2211
2212 if (!ctrl->is_int) {
2213 ctrl->p_new.p = data;
2214 ctrl->p_cur.p = data + tot_ctrl_size;
2215 } else {
2216 ctrl->p_new.p = &ctrl->val;
2217 ctrl->p_cur.p = &ctrl->cur.val;
2218 }
2219 for (idx = 0; idx < elems; idx++) {
2220 ctrl->type_ops->init(ctrl, idx, ctrl->p_cur);
2221 ctrl->type_ops->init(ctrl, idx, ctrl->p_new);
2222 }
2223
2224 if (handler_new_ref(hdl, ctrl)) {
2225 kvfree(ctrl);
2226 return NULL;
2227 }
2228 mutex_lock(hdl->lock);
2229 list_add_tail(&ctrl->node, &hdl->ctrls);
2230 mutex_unlock(hdl->lock);
2231 return ctrl;
2232 }
2233
v4l2_ctrl_new_custom(struct v4l2_ctrl_handler * hdl,const struct v4l2_ctrl_config * cfg,void * priv)2234 struct v4l2_ctrl *v4l2_ctrl_new_custom(struct v4l2_ctrl_handler *hdl,
2235 const struct v4l2_ctrl_config *cfg, void *priv)
2236 {
2237 bool is_menu;
2238 struct v4l2_ctrl *ctrl;
2239 const char *name = cfg->name;
2240 const char * const *qmenu = cfg->qmenu;
2241 const s64 *qmenu_int = cfg->qmenu_int;
2242 enum v4l2_ctrl_type type = cfg->type;
2243 u32 flags = cfg->flags;
2244 s64 min = cfg->min;
2245 s64 max = cfg->max;
2246 u64 step = cfg->step;
2247 s64 def = cfg->def;
2248
2249 if (name == NULL)
2250 v4l2_ctrl_fill(cfg->id, &name, &type, &min, &max, &step,
2251 &def, &flags);
2252
2253 is_menu = (type == V4L2_CTRL_TYPE_MENU ||
2254 type == V4L2_CTRL_TYPE_INTEGER_MENU);
2255 if (is_menu)
2256 WARN_ON(step);
2257 else
2258 WARN_ON(cfg->menu_skip_mask);
2259 if (type == V4L2_CTRL_TYPE_MENU && !qmenu) {
2260 qmenu = v4l2_ctrl_get_menu(cfg->id);
2261 } else if (type == V4L2_CTRL_TYPE_INTEGER_MENU && !qmenu_int) {
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