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UBUNTU: Ubuntu-4.15.0-96.97
[mirror_ubuntu-bionic-kernel.git] / drivers / media / v4l2-core / v4l2-ctrls.c
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. */
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. */
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. */
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
435 static const char * const flash_led_mode[] = {
436 "Off",
437 "Flash",
438 "Torch",
439 NULL,
440 };
441 static const char * const flash_strobe_source[] = {
442 "Software",
443 "External",
444 NULL,
445 };
446
447 static const char * const jpeg_chroma_subsampling[] = {
448 "4:4:4",
449 "4:2:2",
450 "4:2:0",
451 "4:1:1",
452 "4:1:0",
453 "Gray",
454 NULL,
455 };
456 static const char * const dv_tx_mode[] = {
457 "DVI-D",
458 "HDMI",
459 NULL,
460 };
461 static const char * const dv_rgb_range[] = {
462 "Automatic",
463 "RGB Limited Range (16-235)",
464 "RGB Full Range (0-255)",
465 NULL,
466 };
467 static const char * const dv_it_content_type[] = {
468 "Graphics",
469 "Photo",
470 "Cinema",
471 "Game",
472 "No IT Content",
473 NULL,
474 };
475 static const char * const detect_md_mode[] = {
476 "Disabled",
477 "Global",
478 "Threshold Grid",
479 "Region Grid",
480 NULL,
481 };
482
483
484 switch (id) {
485 case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ:
486 return mpeg_audio_sampling_freq;
487 case V4L2_CID_MPEG_AUDIO_ENCODING:
488 return mpeg_audio_encoding;
489 case V4L2_CID_MPEG_AUDIO_L1_BITRATE:
490 return mpeg_audio_l1_bitrate;
491 case V4L2_CID_MPEG_AUDIO_L2_BITRATE:
492 return mpeg_audio_l2_bitrate;
493 case V4L2_CID_MPEG_AUDIO_L3_BITRATE:
494 return mpeg_audio_l3_bitrate;
495 case V4L2_CID_MPEG_AUDIO_AC3_BITRATE:
496 return mpeg_audio_ac3_bitrate;
497 case V4L2_CID_MPEG_AUDIO_MODE:
498 return mpeg_audio_mode;
499 case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION:
500 return mpeg_audio_mode_extension;
501 case V4L2_CID_MPEG_AUDIO_EMPHASIS:
502 return mpeg_audio_emphasis;
503 case V4L2_CID_MPEG_AUDIO_CRC:
504 return mpeg_audio_crc;
505 case V4L2_CID_MPEG_AUDIO_DEC_PLAYBACK:
506 case V4L2_CID_MPEG_AUDIO_DEC_MULTILINGUAL_PLAYBACK:
507 return mpeg_audio_dec_playback;
508 case V4L2_CID_MPEG_VIDEO_ENCODING:
509 return mpeg_video_encoding;
510 case V4L2_CID_MPEG_VIDEO_ASPECT:
511 return mpeg_video_aspect;
512 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
513 return mpeg_video_bitrate_mode;
514 case V4L2_CID_MPEG_STREAM_TYPE:
515 return mpeg_stream_type;
516 case V4L2_CID_MPEG_STREAM_VBI_FMT:
517 return mpeg_stream_vbi_fmt;
518 case V4L2_CID_POWER_LINE_FREQUENCY:
519 return camera_power_line_frequency;
520 case V4L2_CID_EXPOSURE_AUTO:
521 return camera_exposure_auto;
522 case V4L2_CID_EXPOSURE_METERING:
523 return camera_exposure_metering;
524 case V4L2_CID_AUTO_FOCUS_RANGE:
525 return camera_auto_focus_range;
526 case V4L2_CID_COLORFX:
527 return colorfx;
528 case V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE:
529 return auto_n_preset_white_balance;
530 case V4L2_CID_ISO_SENSITIVITY_AUTO:
531 return camera_iso_sensitivity_auto;
532 case V4L2_CID_SCENE_MODE:
533 return scene_mode;
534 case V4L2_CID_TUNE_PREEMPHASIS:
535 return tune_emphasis;
536 case V4L2_CID_TUNE_DEEMPHASIS:
537 return tune_emphasis;
538 case V4L2_CID_FLASH_LED_MODE:
539 return flash_led_mode;
540 case V4L2_CID_FLASH_STROBE_SOURCE:
541 return flash_strobe_source;
542 case V4L2_CID_MPEG_VIDEO_HEADER_MODE:
543 return header_mode;
544 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE:
545 return multi_slice;
546 case V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE:
547 return entropy_mode;
548 case V4L2_CID_MPEG_VIDEO_H264_LEVEL:
549 return mpeg_h264_level;
550 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE:
551 return h264_loop_filter;
552 case V4L2_CID_MPEG_VIDEO_H264_PROFILE:
553 return h264_profile;
554 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC:
555 return vui_sar_idc;
556 case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE:
557 return h264_fp_arrangement_type;
558 case V4L2_CID_MPEG_VIDEO_H264_FMO_MAP_TYPE:
559 return h264_fmo_map_type;
560 case V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL:
561 return mpeg_mpeg4_level;
562 case V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE:
563 return mpeg4_profile;
564 case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_SEL:
565 return vpx_golden_frame_sel;
566 case V4L2_CID_JPEG_CHROMA_SUBSAMPLING:
567 return jpeg_chroma_subsampling;
568 case V4L2_CID_DV_TX_MODE:
569 return dv_tx_mode;
570 case V4L2_CID_DV_TX_RGB_RANGE:
571 case V4L2_CID_DV_RX_RGB_RANGE:
572 return dv_rgb_range;
573 case V4L2_CID_DV_TX_IT_CONTENT_TYPE:
574 case V4L2_CID_DV_RX_IT_CONTENT_TYPE:
575 return dv_it_content_type;
576 case V4L2_CID_DETECT_MD_MODE:
577 return detect_md_mode;
578
579 default:
580 return NULL;
581 }
582 }
583 EXPORT_SYMBOL(v4l2_ctrl_get_menu);
584
585 #define __v4l2_qmenu_int_len(arr, len) ({ *(len) = ARRAY_SIZE(arr); arr; })
586 /*
587 * Returns NULL or an s64 type array containing the menu for given
588 * control ID. The total number of the menu items is returned in @len.
589 */
590 const s64 *v4l2_ctrl_get_int_menu(u32 id, u32 *len)
591 {
592 static const s64 qmenu_int_vpx_num_partitions[] = {
593 1, 2, 4, 8,
594 };
595
596 static const s64 qmenu_int_vpx_num_ref_frames[] = {
597 1, 2, 3,
598 };
599
600 switch (id) {
601 case V4L2_CID_MPEG_VIDEO_VPX_NUM_PARTITIONS:
602 return __v4l2_qmenu_int_len(qmenu_int_vpx_num_partitions, len);
603 case V4L2_CID_MPEG_VIDEO_VPX_NUM_REF_FRAMES:
604 return __v4l2_qmenu_int_len(qmenu_int_vpx_num_ref_frames, len);
605 default:
606 *len = 0;
607 return NULL;
608 }
609 }
610 EXPORT_SYMBOL(v4l2_ctrl_get_int_menu);
611
612 /* Return the control name. */
613 const char *v4l2_ctrl_get_name(u32 id)
614 {
615 switch (id) {
616 /* USER controls */
617 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
618 case V4L2_CID_USER_CLASS: return "User Controls";
619 case V4L2_CID_BRIGHTNESS: return "Brightness";
620 case V4L2_CID_CONTRAST: return "Contrast";
621 case V4L2_CID_SATURATION: return "Saturation";
622 case V4L2_CID_HUE: return "Hue";
623 case V4L2_CID_AUDIO_VOLUME: return "Volume";
624 case V4L2_CID_AUDIO_BALANCE: return "Balance";
625 case V4L2_CID_AUDIO_BASS: return "Bass";
626 case V4L2_CID_AUDIO_TREBLE: return "Treble";
627 case V4L2_CID_AUDIO_MUTE: return "Mute";
628 case V4L2_CID_AUDIO_LOUDNESS: return "Loudness";
629 case V4L2_CID_BLACK_LEVEL: return "Black Level";
630 case V4L2_CID_AUTO_WHITE_BALANCE: return "White Balance, Automatic";
631 case V4L2_CID_DO_WHITE_BALANCE: return "Do White Balance";
632 case V4L2_CID_RED_BALANCE: return "Red Balance";
633 case V4L2_CID_BLUE_BALANCE: return "Blue Balance";
634 case V4L2_CID_GAMMA: return "Gamma";
635 case V4L2_CID_EXPOSURE: return "Exposure";
636 case V4L2_CID_AUTOGAIN: return "Gain, Automatic";
637 case V4L2_CID_GAIN: return "Gain";
638 case V4L2_CID_HFLIP: return "Horizontal Flip";
639 case V4L2_CID_VFLIP: return "Vertical Flip";
640 case V4L2_CID_POWER_LINE_FREQUENCY: return "Power Line Frequency";
641 case V4L2_CID_HUE_AUTO: return "Hue, Automatic";
642 case V4L2_CID_WHITE_BALANCE_TEMPERATURE: return "White Balance Temperature";
643 case V4L2_CID_SHARPNESS: return "Sharpness";
644 case V4L2_CID_BACKLIGHT_COMPENSATION: return "Backlight Compensation";
645 case V4L2_CID_CHROMA_AGC: return "Chroma AGC";
646 case V4L2_CID_COLOR_KILLER: return "Color Killer";
647 case V4L2_CID_COLORFX: return "Color Effects";
648 case V4L2_CID_AUTOBRIGHTNESS: return "Brightness, Automatic";
649 case V4L2_CID_BAND_STOP_FILTER: return "Band-Stop Filter";
650 case V4L2_CID_ROTATE: return "Rotate";
651 case V4L2_CID_BG_COLOR: return "Background Color";
652 case V4L2_CID_CHROMA_GAIN: return "Chroma Gain";
653 case V4L2_CID_ILLUMINATORS_1: return "Illuminator 1";
654 case V4L2_CID_ILLUMINATORS_2: return "Illuminator 2";
655 case V4L2_CID_MIN_BUFFERS_FOR_CAPTURE: return "Min Number of Capture Buffers";
656 case V4L2_CID_MIN_BUFFERS_FOR_OUTPUT: return "Min Number of Output Buffers";
657 case V4L2_CID_ALPHA_COMPONENT: return "Alpha Component";
658 case V4L2_CID_COLORFX_CBCR: return "Color Effects, CbCr";
659
660 /* Codec controls */
661 /* The MPEG controls are applicable to all codec controls
662 * and the 'MPEG' part of the define is historical */
663 /* Keep the order of the 'case's the same as in videodev2.h! */
664 case V4L2_CID_MPEG_CLASS: return "Codec Controls";
665 case V4L2_CID_MPEG_STREAM_TYPE: return "Stream Type";
666 case V4L2_CID_MPEG_STREAM_PID_PMT: return "Stream PMT Program ID";
667 case V4L2_CID_MPEG_STREAM_PID_AUDIO: return "Stream Audio Program ID";
668 case V4L2_CID_MPEG_STREAM_PID_VIDEO: return "Stream Video Program ID";
669 case V4L2_CID_MPEG_STREAM_PID_PCR: return "Stream PCR Program ID";
670 case V4L2_CID_MPEG_STREAM_PES_ID_AUDIO: return "Stream PES Audio ID";
671 case V4L2_CID_MPEG_STREAM_PES_ID_VIDEO: return "Stream PES Video ID";
672 case V4L2_CID_MPEG_STREAM_VBI_FMT: return "Stream VBI Format";
673 case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ: return "Audio Sampling Frequency";
674 case V4L2_CID_MPEG_AUDIO_ENCODING: return "Audio Encoding";
675 case V4L2_CID_MPEG_AUDIO_L1_BITRATE: return "Audio Layer I Bitrate";
676 case V4L2_CID_MPEG_AUDIO_L2_BITRATE: return "Audio Layer II Bitrate";
677 case V4L2_CID_MPEG_AUDIO_L3_BITRATE: return "Audio Layer III Bitrate";
678 case V4L2_CID_MPEG_AUDIO_MODE: return "Audio Stereo Mode";
679 case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION: return "Audio Stereo Mode Extension";
680 case V4L2_CID_MPEG_AUDIO_EMPHASIS: return "Audio Emphasis";
681 case V4L2_CID_MPEG_AUDIO_CRC: return "Audio CRC";
682 case V4L2_CID_MPEG_AUDIO_MUTE: return "Audio Mute";
683 case V4L2_CID_MPEG_AUDIO_AAC_BITRATE: return "Audio AAC Bitrate";
684 case V4L2_CID_MPEG_AUDIO_AC3_BITRATE: return "Audio AC-3 Bitrate";
685 case V4L2_CID_MPEG_AUDIO_DEC_PLAYBACK: return "Audio Playback";
686 case V4L2_CID_MPEG_AUDIO_DEC_MULTILINGUAL_PLAYBACK: return "Audio Multilingual Playback";
687 case V4L2_CID_MPEG_VIDEO_ENCODING: return "Video Encoding";
688 case V4L2_CID_MPEG_VIDEO_ASPECT: return "Video Aspect";
689 case V4L2_CID_MPEG_VIDEO_B_FRAMES: return "Video B Frames";
690 case V4L2_CID_MPEG_VIDEO_GOP_SIZE: return "Video GOP Size";
691 case V4L2_CID_MPEG_VIDEO_GOP_CLOSURE: return "Video GOP Closure";
692 case V4L2_CID_MPEG_VIDEO_PULLDOWN: return "Video Pulldown";
693 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE: return "Video Bitrate Mode";
694 case V4L2_CID_MPEG_VIDEO_BITRATE: return "Video Bitrate";
695 case V4L2_CID_MPEG_VIDEO_BITRATE_PEAK: return "Video Peak Bitrate";
696 case V4L2_CID_MPEG_VIDEO_TEMPORAL_DECIMATION: return "Video Temporal Decimation";
697 case V4L2_CID_MPEG_VIDEO_MUTE: return "Video Mute";
698 case V4L2_CID_MPEG_VIDEO_MUTE_YUV: return "Video Mute YUV";
699 case V4L2_CID_MPEG_VIDEO_DECODER_SLICE_INTERFACE: return "Decoder Slice Interface";
700 case V4L2_CID_MPEG_VIDEO_DECODER_MPEG4_DEBLOCK_FILTER: return "MPEG4 Loop Filter Enable";
701 case V4L2_CID_MPEG_VIDEO_CYCLIC_INTRA_REFRESH_MB: return "Number of Intra Refresh MBs";
702 case V4L2_CID_MPEG_VIDEO_FRAME_RC_ENABLE: return "Frame Level Rate Control Enable";
703 case V4L2_CID_MPEG_VIDEO_MB_RC_ENABLE: return "H264 MB Level Rate Control";
704 case V4L2_CID_MPEG_VIDEO_HEADER_MODE: return "Sequence Header Mode";
705 case V4L2_CID_MPEG_VIDEO_MAX_REF_PIC: return "Max Number of Reference Pics";
706 case V4L2_CID_MPEG_VIDEO_H263_I_FRAME_QP: return "H263 I-Frame QP Value";
707 case V4L2_CID_MPEG_VIDEO_H263_P_FRAME_QP: return "H263 P-Frame QP Value";
708 case V4L2_CID_MPEG_VIDEO_H263_B_FRAME_QP: return "H263 B-Frame QP Value";
709 case V4L2_CID_MPEG_VIDEO_H263_MIN_QP: return "H263 Minimum QP Value";
710 case V4L2_CID_MPEG_VIDEO_H263_MAX_QP: return "H263 Maximum QP Value";
711 case V4L2_CID_MPEG_VIDEO_H264_I_FRAME_QP: return "H264 I-Frame QP Value";
712 case V4L2_CID_MPEG_VIDEO_H264_P_FRAME_QP: return "H264 P-Frame QP Value";
713 case V4L2_CID_MPEG_VIDEO_H264_B_FRAME_QP: return "H264 B-Frame QP Value";
714 case V4L2_CID_MPEG_VIDEO_H264_MAX_QP: return "H264 Maximum QP Value";
715 case V4L2_CID_MPEG_VIDEO_H264_MIN_QP: return "H264 Minimum QP Value";
716 case V4L2_CID_MPEG_VIDEO_H264_8X8_TRANSFORM: return "H264 8x8 Transform Enable";
717 case V4L2_CID_MPEG_VIDEO_H264_CPB_SIZE: return "H264 CPB Buffer Size";
718 case V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE: return "H264 Entropy Mode";
719 case V4L2_CID_MPEG_VIDEO_H264_I_PERIOD: return "H264 I-Frame Period";
720 case V4L2_CID_MPEG_VIDEO_H264_LEVEL: return "H264 Level";
721 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_ALPHA: return "H264 Loop Filter Alpha Offset";
722 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_BETA: return "H264 Loop Filter Beta Offset";
723 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE: return "H264 Loop Filter Mode";
724 case V4L2_CID_MPEG_VIDEO_H264_PROFILE: return "H264 Profile";
725 case V4L2_CID_MPEG_VIDEO_H264_VUI_EXT_SAR_HEIGHT: return "Vertical Size of SAR";
726 case V4L2_CID_MPEG_VIDEO_H264_VUI_EXT_SAR_WIDTH: return "Horizontal Size of SAR";
727 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_ENABLE: return "Aspect Ratio VUI Enable";
728 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC: return "VUI Aspect Ratio IDC";
729 case V4L2_CID_MPEG_VIDEO_H264_SEI_FRAME_PACKING: return "H264 Enable Frame Packing SEI";
730 case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_CURRENT_FRAME_0: return "H264 Set Curr. Frame as Frame0";
731 case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE: return "H264 FP Arrangement Type";
732 case V4L2_CID_MPEG_VIDEO_H264_FMO: return "H264 Flexible MB Ordering";
733 case V4L2_CID_MPEG_VIDEO_H264_FMO_MAP_TYPE: return "H264 Map Type for FMO";
734 case V4L2_CID_MPEG_VIDEO_H264_FMO_SLICE_GROUP: return "H264 FMO Number of Slice Groups";
735 case V4L2_CID_MPEG_VIDEO_H264_FMO_CHANGE_DIRECTION: return "H264 FMO Direction of Change";
736 case V4L2_CID_MPEG_VIDEO_H264_FMO_CHANGE_RATE: return "H264 FMO Size of 1st Slice Grp";
737 case V4L2_CID_MPEG_VIDEO_H264_FMO_RUN_LENGTH: return "H264 FMO No. of Consecutive MBs";
738 case V4L2_CID_MPEG_VIDEO_H264_ASO: return "H264 Arbitrary Slice Ordering";
739 case V4L2_CID_MPEG_VIDEO_H264_ASO_SLICE_ORDER: return "H264 ASO Slice Order";
740 case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING: return "Enable H264 Hierarchical Coding";
741 case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_TYPE: return "H264 Hierarchical Coding Type";
742 case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_LAYER:return "H264 Number of HC Layers";
743 case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_LAYER_QP:
744 return "H264 Set QP Value for HC Layers";
745 case V4L2_CID_MPEG_VIDEO_MPEG4_I_FRAME_QP: return "MPEG4 I-Frame QP Value";
746 case V4L2_CID_MPEG_VIDEO_MPEG4_P_FRAME_QP: return "MPEG4 P-Frame QP Value";
747 case V4L2_CID_MPEG_VIDEO_MPEG4_B_FRAME_QP: return "MPEG4 B-Frame QP Value";
748 case V4L2_CID_MPEG_VIDEO_MPEG4_MIN_QP: return "MPEG4 Minimum QP Value";
749 case V4L2_CID_MPEG_VIDEO_MPEG4_MAX_QP: return "MPEG4 Maximum QP Value";
750 case V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL: return "MPEG4 Level";
751 case V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE: return "MPEG4 Profile";
752 case V4L2_CID_MPEG_VIDEO_MPEG4_QPEL: return "Quarter Pixel Search Enable";
753 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MAX_BYTES: return "Maximum Bytes in a Slice";
754 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MAX_MB: return "Number of MBs in a Slice";
755 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE: return "Slice Partitioning Method";
756 case V4L2_CID_MPEG_VIDEO_VBV_SIZE: return "VBV Buffer Size";
757 case V4L2_CID_MPEG_VIDEO_DEC_PTS: return "Video Decoder PTS";
758 case V4L2_CID_MPEG_VIDEO_DEC_FRAME: return "Video Decoder Frame Count";
759 case V4L2_CID_MPEG_VIDEO_VBV_DELAY: return "Initial Delay for VBV Control";
760 case V4L2_CID_MPEG_VIDEO_MV_H_SEARCH_RANGE: return "Horizontal MV Search Range";
761 case V4L2_CID_MPEG_VIDEO_MV_V_SEARCH_RANGE: return "Vertical MV Search Range";
762 case V4L2_CID_MPEG_VIDEO_REPEAT_SEQ_HEADER: return "Repeat Sequence Header";
763 case V4L2_CID_MPEG_VIDEO_FORCE_KEY_FRAME: return "Force Key Frame";
764
765 /* VPX controls */
766 case V4L2_CID_MPEG_VIDEO_VPX_NUM_PARTITIONS: return "VPX Number of Partitions";
767 case V4L2_CID_MPEG_VIDEO_VPX_IMD_DISABLE_4X4: return "VPX Intra Mode Decision Disable";
768 case V4L2_CID_MPEG_VIDEO_VPX_NUM_REF_FRAMES: return "VPX No. of Refs for P Frame";
769 case V4L2_CID_MPEG_VIDEO_VPX_FILTER_LEVEL: return "VPX Loop Filter Level Range";
770 case V4L2_CID_MPEG_VIDEO_VPX_FILTER_SHARPNESS: return "VPX Deblocking Effect Control";
771 case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_REF_PERIOD: return "VPX Golden Frame Refresh Period";
772 case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_SEL: return "VPX Golden Frame Indicator";
773 case V4L2_CID_MPEG_VIDEO_VPX_MIN_QP: return "VPX Minimum QP Value";
774 case V4L2_CID_MPEG_VIDEO_VPX_MAX_QP: return "VPX Maximum QP Value";
775 case V4L2_CID_MPEG_VIDEO_VPX_I_FRAME_QP: return "VPX I-Frame QP Value";
776 case V4L2_CID_MPEG_VIDEO_VPX_P_FRAME_QP: return "VPX P-Frame QP Value";
777 case V4L2_CID_MPEG_VIDEO_VPX_PROFILE: return "VPX Profile";
778
779 /* CAMERA controls */
780 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
781 case V4L2_CID_CAMERA_CLASS: return "Camera Controls";
782 case V4L2_CID_EXPOSURE_AUTO: return "Auto Exposure";
783 case V4L2_CID_EXPOSURE_ABSOLUTE: return "Exposure Time, Absolute";
784 case V4L2_CID_EXPOSURE_AUTO_PRIORITY: return "Exposure, Dynamic Framerate";
785 case V4L2_CID_PAN_RELATIVE: return "Pan, Relative";
786 case V4L2_CID_TILT_RELATIVE: return "Tilt, Relative";
787 case V4L2_CID_PAN_RESET: return "Pan, Reset";
788 case V4L2_CID_TILT_RESET: return "Tilt, Reset";
789 case V4L2_CID_PAN_ABSOLUTE: return "Pan, Absolute";
790 case V4L2_CID_TILT_ABSOLUTE: return "Tilt, Absolute";
791 case V4L2_CID_FOCUS_ABSOLUTE: return "Focus, Absolute";
792 case V4L2_CID_FOCUS_RELATIVE: return "Focus, Relative";
793 case V4L2_CID_FOCUS_AUTO: return "Focus, Automatic Continuous";
794 case V4L2_CID_ZOOM_ABSOLUTE: return "Zoom, Absolute";
795 case V4L2_CID_ZOOM_RELATIVE: return "Zoom, Relative";
796 case V4L2_CID_ZOOM_CONTINUOUS: return "Zoom, Continuous";
797 case V4L2_CID_PRIVACY: return "Privacy";
798 case V4L2_CID_IRIS_ABSOLUTE: return "Iris, Absolute";
799 case V4L2_CID_IRIS_RELATIVE: return "Iris, Relative";
800 case V4L2_CID_AUTO_EXPOSURE_BIAS: return "Auto Exposure, Bias";
801 case V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE: return "White Balance, Auto & Preset";
802 case V4L2_CID_WIDE_DYNAMIC_RANGE: return "Wide Dynamic Range";
803 case V4L2_CID_IMAGE_STABILIZATION: return "Image Stabilization";
804 case V4L2_CID_ISO_SENSITIVITY: return "ISO Sensitivity";
805 case V4L2_CID_ISO_SENSITIVITY_AUTO: return "ISO Sensitivity, Auto";
806 case V4L2_CID_EXPOSURE_METERING: return "Exposure, Metering Mode";
807 case V4L2_CID_SCENE_MODE: return "Scene Mode";
808 case V4L2_CID_3A_LOCK: return "3A Lock";
809 case V4L2_CID_AUTO_FOCUS_START: return "Auto Focus, Start";
810 case V4L2_CID_AUTO_FOCUS_STOP: return "Auto Focus, Stop";
811 case V4L2_CID_AUTO_FOCUS_STATUS: return "Auto Focus, Status";
812 case V4L2_CID_AUTO_FOCUS_RANGE: return "Auto Focus, Range";
813 case V4L2_CID_PAN_SPEED: return "Pan, Speed";
814 case V4L2_CID_TILT_SPEED: return "Tilt, Speed";
815
816 /* FM Radio Modulator controls */
817 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
818 case V4L2_CID_FM_TX_CLASS: return "FM Radio Modulator Controls";
819 case V4L2_CID_RDS_TX_DEVIATION: return "RDS Signal Deviation";
820 case V4L2_CID_RDS_TX_PI: return "RDS Program ID";
821 case V4L2_CID_RDS_TX_PTY: return "RDS Program Type";
822 case V4L2_CID_RDS_TX_PS_NAME: return "RDS PS Name";
823 case V4L2_CID_RDS_TX_RADIO_TEXT: return "RDS Radio Text";
824 case V4L2_CID_RDS_TX_MONO_STEREO: return "RDS Stereo";
825 case V4L2_CID_RDS_TX_ARTIFICIAL_HEAD: return "RDS Artificial Head";
826 case V4L2_CID_RDS_TX_COMPRESSED: return "RDS Compressed";
827 case V4L2_CID_RDS_TX_DYNAMIC_PTY: return "RDS Dynamic PTY";
828 case V4L2_CID_RDS_TX_TRAFFIC_ANNOUNCEMENT: return "RDS Traffic Announcement";
829 case V4L2_CID_RDS_TX_TRAFFIC_PROGRAM: return "RDS Traffic Program";
830 case V4L2_CID_RDS_TX_MUSIC_SPEECH: return "RDS Music";
831 case V4L2_CID_RDS_TX_ALT_FREQS_ENABLE: return "RDS Enable Alt Frequencies";
832 case V4L2_CID_RDS_TX_ALT_FREQS: return "RDS Alternate Frequencies";
833 case V4L2_CID_AUDIO_LIMITER_ENABLED: return "Audio Limiter Feature Enabled";
834 case V4L2_CID_AUDIO_LIMITER_RELEASE_TIME: return "Audio Limiter Release Time";
835 case V4L2_CID_AUDIO_LIMITER_DEVIATION: return "Audio Limiter Deviation";
836 case V4L2_CID_AUDIO_COMPRESSION_ENABLED: return "Audio Compression Enabled";
837 case V4L2_CID_AUDIO_COMPRESSION_GAIN: return "Audio Compression Gain";
838 case V4L2_CID_AUDIO_COMPRESSION_THRESHOLD: return "Audio Compression Threshold";
839 case V4L2_CID_AUDIO_COMPRESSION_ATTACK_TIME: return "Audio Compression Attack Time";
840 case V4L2_CID_AUDIO_COMPRESSION_RELEASE_TIME: return "Audio Compression Release Time";
841 case V4L2_CID_PILOT_TONE_ENABLED: return "Pilot Tone Feature Enabled";
842 case V4L2_CID_PILOT_TONE_DEVIATION: return "Pilot Tone Deviation";
843 case V4L2_CID_PILOT_TONE_FREQUENCY: return "Pilot Tone Frequency";
844 case V4L2_CID_TUNE_PREEMPHASIS: return "Pre-Emphasis";
845 case V4L2_CID_TUNE_POWER_LEVEL: return "Tune Power Level";
846 case V4L2_CID_TUNE_ANTENNA_CAPACITOR: return "Tune Antenna Capacitor";
847
848 /* Flash controls */
849 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
850 case V4L2_CID_FLASH_CLASS: return "Flash Controls";
851 case V4L2_CID_FLASH_LED_MODE: return "LED Mode";
852 case V4L2_CID_FLASH_STROBE_SOURCE: return "Strobe Source";
853 case V4L2_CID_FLASH_STROBE: return "Strobe";
854 case V4L2_CID_FLASH_STROBE_STOP: return "Stop Strobe";
855 case V4L2_CID_FLASH_STROBE_STATUS: return "Strobe Status";
856 case V4L2_CID_FLASH_TIMEOUT: return "Strobe Timeout";
857 case V4L2_CID_FLASH_INTENSITY: return "Intensity, Flash Mode";
858 case V4L2_CID_FLASH_TORCH_INTENSITY: return "Intensity, Torch Mode";
859 case V4L2_CID_FLASH_INDICATOR_INTENSITY: return "Intensity, Indicator";
860 case V4L2_CID_FLASH_FAULT: return "Faults";
861 case V4L2_CID_FLASH_CHARGE: return "Charge";
862 case V4L2_CID_FLASH_READY: return "Ready to Strobe";
863
864 /* JPEG encoder controls */
865 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
866 case V4L2_CID_JPEG_CLASS: return "JPEG Compression Controls";
867 case V4L2_CID_JPEG_CHROMA_SUBSAMPLING: return "Chroma Subsampling";
868 case V4L2_CID_JPEG_RESTART_INTERVAL: return "Restart Interval";
869 case V4L2_CID_JPEG_COMPRESSION_QUALITY: return "Compression Quality";
870 case V4L2_CID_JPEG_ACTIVE_MARKER: return "Active Markers";
871
872 /* Image source controls */
873 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
874 case V4L2_CID_IMAGE_SOURCE_CLASS: return "Image Source Controls";
875 case V4L2_CID_VBLANK: return "Vertical Blanking";
876 case V4L2_CID_HBLANK: return "Horizontal Blanking";
877 case V4L2_CID_ANALOGUE_GAIN: return "Analogue Gain";
878 case V4L2_CID_TEST_PATTERN_RED: return "Red Pixel Value";
879 case V4L2_CID_TEST_PATTERN_GREENR: return "Green (Red) Pixel Value";
880 case V4L2_CID_TEST_PATTERN_BLUE: return "Blue Pixel Value";
881 case V4L2_CID_TEST_PATTERN_GREENB: return "Green (Blue) Pixel Value";
882
883 /* Image processing controls */
884 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
885 case V4L2_CID_IMAGE_PROC_CLASS: return "Image Processing Controls";
886 case V4L2_CID_LINK_FREQ: return "Link Frequency";
887 case V4L2_CID_PIXEL_RATE: return "Pixel Rate";
888 case V4L2_CID_TEST_PATTERN: return "Test Pattern";
889 case V4L2_CID_DEINTERLACING_MODE: return "Deinterlacing Mode";
890 case V4L2_CID_DIGITAL_GAIN: return "Digital Gain";
891
892 /* DV controls */
893 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
894 case V4L2_CID_DV_CLASS: return "Digital Video Controls";
895 case V4L2_CID_DV_TX_HOTPLUG: return "Hotplug Present";
896 case V4L2_CID_DV_TX_RXSENSE: return "RxSense Present";
897 case V4L2_CID_DV_TX_EDID_PRESENT: return "EDID Present";
898 case V4L2_CID_DV_TX_MODE: return "Transmit Mode";
899 case V4L2_CID_DV_TX_RGB_RANGE: return "Tx RGB Quantization Range";
900 case V4L2_CID_DV_TX_IT_CONTENT_TYPE: return "Tx IT Content Type";
901 case V4L2_CID_DV_RX_POWER_PRESENT: return "Power Present";
902 case V4L2_CID_DV_RX_RGB_RANGE: return "Rx RGB Quantization Range";
903 case V4L2_CID_DV_RX_IT_CONTENT_TYPE: return "Rx IT Content Type";
904
905 case V4L2_CID_FM_RX_CLASS: return "FM Radio Receiver Controls";
906 case V4L2_CID_TUNE_DEEMPHASIS: return "De-Emphasis";
907 case V4L2_CID_RDS_RECEPTION: return "RDS Reception";
908 case V4L2_CID_RF_TUNER_CLASS: return "RF Tuner Controls";
909 case V4L2_CID_RF_TUNER_RF_GAIN: return "RF Gain";
910 case V4L2_CID_RF_TUNER_LNA_GAIN_AUTO: return "LNA Gain, Auto";
911 case V4L2_CID_RF_TUNER_LNA_GAIN: return "LNA Gain";
912 case V4L2_CID_RF_TUNER_MIXER_GAIN_AUTO: return "Mixer Gain, Auto";
913 case V4L2_CID_RF_TUNER_MIXER_GAIN: return "Mixer Gain";
914 case V4L2_CID_RF_TUNER_IF_GAIN_AUTO: return "IF Gain, Auto";
915 case V4L2_CID_RF_TUNER_IF_GAIN: return "IF Gain";
916 case V4L2_CID_RF_TUNER_BANDWIDTH_AUTO: return "Bandwidth, Auto";
917 case V4L2_CID_RF_TUNER_BANDWIDTH: return "Bandwidth";
918 case V4L2_CID_RF_TUNER_PLL_LOCK: return "PLL Lock";
919 case V4L2_CID_RDS_RX_PTY: return "RDS Program Type";
920 case V4L2_CID_RDS_RX_PS_NAME: return "RDS PS Name";
921 case V4L2_CID_RDS_RX_RADIO_TEXT: return "RDS Radio Text";
922 case V4L2_CID_RDS_RX_TRAFFIC_ANNOUNCEMENT: return "RDS Traffic Announcement";
923 case V4L2_CID_RDS_RX_TRAFFIC_PROGRAM: return "RDS Traffic Program";
924 case V4L2_CID_RDS_RX_MUSIC_SPEECH: return "RDS Music";
925
926 /* Detection controls */
927 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
928 case V4L2_CID_DETECT_CLASS: return "Detection Controls";
929 case V4L2_CID_DETECT_MD_MODE: return "Motion Detection Mode";
930 case V4L2_CID_DETECT_MD_GLOBAL_THRESHOLD: return "MD Global Threshold";
931 case V4L2_CID_DETECT_MD_THRESHOLD_GRID: return "MD Threshold Grid";
932 case V4L2_CID_DETECT_MD_REGION_GRID: return "MD Region Grid";
933 default:
934 return NULL;
935 }
936 }
937 EXPORT_SYMBOL(v4l2_ctrl_get_name);
938
939 void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type,
940 s64 *min, s64 *max, u64 *step, s64 *def, u32 *flags)
941 {
942 *name = v4l2_ctrl_get_name(id);
943 *flags = 0;
944
945 switch (id) {
946 case V4L2_CID_AUDIO_MUTE:
947 case V4L2_CID_AUDIO_LOUDNESS:
948 case V4L2_CID_AUTO_WHITE_BALANCE:
949 case V4L2_CID_AUTOGAIN:
950 case V4L2_CID_HFLIP:
951 case V4L2_CID_VFLIP:
952 case V4L2_CID_HUE_AUTO:
953 case V4L2_CID_CHROMA_AGC:
954 case V4L2_CID_COLOR_KILLER:
955 case V4L2_CID_AUTOBRIGHTNESS:
956 case V4L2_CID_MPEG_AUDIO_MUTE:
957 case V4L2_CID_MPEG_VIDEO_MUTE:
958 case V4L2_CID_MPEG_VIDEO_GOP_CLOSURE:
959 case V4L2_CID_MPEG_VIDEO_PULLDOWN:
960 case V4L2_CID_EXPOSURE_AUTO_PRIORITY:
961 case V4L2_CID_FOCUS_AUTO:
962 case V4L2_CID_PRIVACY:
963 case V4L2_CID_AUDIO_LIMITER_ENABLED:
964 case V4L2_CID_AUDIO_COMPRESSION_ENABLED:
965 case V4L2_CID_PILOT_TONE_ENABLED:
966 case V4L2_CID_ILLUMINATORS_1:
967 case V4L2_CID_ILLUMINATORS_2:
968 case V4L2_CID_FLASH_STROBE_STATUS:
969 case V4L2_CID_FLASH_CHARGE:
970 case V4L2_CID_FLASH_READY:
971 case V4L2_CID_MPEG_VIDEO_DECODER_MPEG4_DEBLOCK_FILTER:
972 case V4L2_CID_MPEG_VIDEO_DECODER_SLICE_INTERFACE:
973 case V4L2_CID_MPEG_VIDEO_FRAME_RC_ENABLE:
974 case V4L2_CID_MPEG_VIDEO_MB_RC_ENABLE:
975 case V4L2_CID_MPEG_VIDEO_H264_8X8_TRANSFORM:
976 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_ENABLE:
977 case V4L2_CID_MPEG_VIDEO_MPEG4_QPEL:
978 case V4L2_CID_MPEG_VIDEO_REPEAT_SEQ_HEADER:
979 case V4L2_CID_WIDE_DYNAMIC_RANGE:
980 case V4L2_CID_IMAGE_STABILIZATION:
981 case V4L2_CID_RDS_RECEPTION:
982 case V4L2_CID_RF_TUNER_LNA_GAIN_AUTO:
983 case V4L2_CID_RF_TUNER_MIXER_GAIN_AUTO:
984 case V4L2_CID_RF_TUNER_IF_GAIN_AUTO:
985 case V4L2_CID_RF_TUNER_BANDWIDTH_AUTO:
986 case V4L2_CID_RF_TUNER_PLL_LOCK:
987 case V4L2_CID_RDS_TX_MONO_STEREO:
988 case V4L2_CID_RDS_TX_ARTIFICIAL_HEAD:
989 case V4L2_CID_RDS_TX_COMPRESSED:
990 case V4L2_CID_RDS_TX_DYNAMIC_PTY:
991 case V4L2_CID_RDS_TX_TRAFFIC_ANNOUNCEMENT:
992 case V4L2_CID_RDS_TX_TRAFFIC_PROGRAM:
993 case V4L2_CID_RDS_TX_MUSIC_SPEECH:
994 case V4L2_CID_RDS_TX_ALT_FREQS_ENABLE:
995 case V4L2_CID_RDS_RX_TRAFFIC_ANNOUNCEMENT:
996 case V4L2_CID_RDS_RX_TRAFFIC_PROGRAM:
997 case V4L2_CID_RDS_RX_MUSIC_SPEECH:
998 *type = V4L2_CTRL_TYPE_BOOLEAN;
999 *min = 0;
1000 *max = *step = 1;
1001 break;
1002 case V4L2_CID_ROTATE:
1003 *type = V4L2_CTRL_TYPE_INTEGER;
1004 *flags |= V4L2_CTRL_FLAG_MODIFY_LAYOUT;
1005 break;
1006 case V4L2_CID_MPEG_VIDEO_MV_H_SEARCH_RANGE:
1007 case V4L2_CID_MPEG_VIDEO_MV_V_SEARCH_RANGE:
1008 *type = V4L2_CTRL_TYPE_INTEGER;
1009 break;
1010 case V4L2_CID_MPEG_VIDEO_FORCE_KEY_FRAME:
1011 case V4L2_CID_PAN_RESET:
1012 case V4L2_CID_TILT_RESET:
1013 case V4L2_CID_FLASH_STROBE:
1014 case V4L2_CID_FLASH_STROBE_STOP:
1015 case V4L2_CID_AUTO_FOCUS_START:
1016 case V4L2_CID_AUTO_FOCUS_STOP:
1017 case V4L2_CID_DO_WHITE_BALANCE:
1018 *type = V4L2_CTRL_TYPE_BUTTON;
1019 *flags |= V4L2_CTRL_FLAG_WRITE_ONLY |
1020 V4L2_CTRL_FLAG_EXECUTE_ON_WRITE;
1021 *min = *max = *step = *def = 0;
1022 break;
1023 case V4L2_CID_POWER_LINE_FREQUENCY:
1024 case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ:
1025 case V4L2_CID_MPEG_AUDIO_ENCODING:
1026 case V4L2_CID_MPEG_AUDIO_L1_BITRATE:
1027 case V4L2_CID_MPEG_AUDIO_L2_BITRATE:
1028 case V4L2_CID_MPEG_AUDIO_L3_BITRATE:
1029 case V4L2_CID_MPEG_AUDIO_AC3_BITRATE:
1030 case V4L2_CID_MPEG_AUDIO_MODE:
1031 case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION:
1032 case V4L2_CID_MPEG_AUDIO_EMPHASIS:
1033 case V4L2_CID_MPEG_AUDIO_CRC:
1034 case V4L2_CID_MPEG_AUDIO_DEC_PLAYBACK:
1035 case V4L2_CID_MPEG_AUDIO_DEC_MULTILINGUAL_PLAYBACK:
1036 case V4L2_CID_MPEG_VIDEO_ENCODING:
1037 case V4L2_CID_MPEG_VIDEO_ASPECT:
1038 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
1039 case V4L2_CID_MPEG_STREAM_TYPE:
1040 case V4L2_CID_MPEG_STREAM_VBI_FMT:
1041 case V4L2_CID_EXPOSURE_AUTO:
1042 case V4L2_CID_AUTO_FOCUS_RANGE:
1043 case V4L2_CID_COLORFX:
1044 case V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE:
1045 case V4L2_CID_TUNE_PREEMPHASIS:
1046 case V4L2_CID_FLASH_LED_MODE:
1047 case V4L2_CID_FLASH_STROBE_SOURCE:
1048 case V4L2_CID_MPEG_VIDEO_HEADER_MODE:
1049 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE:
1050 case V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE:
1051 case V4L2_CID_MPEG_VIDEO_H264_LEVEL:
1052 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE:
1053 case V4L2_CID_MPEG_VIDEO_H264_PROFILE:
1054 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC:
1055 case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE:
1056 case V4L2_CID_MPEG_VIDEO_H264_FMO_MAP_TYPE:
1057 case V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL:
1058 case V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE:
1059 case V4L2_CID_JPEG_CHROMA_SUBSAMPLING:
1060 case V4L2_CID_ISO_SENSITIVITY_AUTO:
1061 case V4L2_CID_EXPOSURE_METERING:
1062 case V4L2_CID_SCENE_MODE:
1063 case V4L2_CID_DV_TX_MODE:
1064 case V4L2_CID_DV_TX_RGB_RANGE:
1065 case V4L2_CID_DV_TX_IT_CONTENT_TYPE:
1066 case V4L2_CID_DV_RX_RGB_RANGE:
1067 case V4L2_CID_DV_RX_IT_CONTENT_TYPE:
1068 case V4L2_CID_TEST_PATTERN:
1069 case V4L2_CID_DEINTERLACING_MODE:
1070 case V4L2_CID_TUNE_DEEMPHASIS:
1071 case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_SEL:
1072 case V4L2_CID_DETECT_MD_MODE:
1073 *type = V4L2_CTRL_TYPE_MENU;
1074 break;
1075 case V4L2_CID_LINK_FREQ:
1076 *type = V4L2_CTRL_TYPE_INTEGER_MENU;
1077 break;
1078 case V4L2_CID_RDS_TX_PS_NAME:
1079 case V4L2_CID_RDS_TX_RADIO_TEXT:
1080 case V4L2_CID_RDS_RX_PS_NAME:
1081 case V4L2_CID_RDS_RX_RADIO_TEXT:
1082 *type = V4L2_CTRL_TYPE_STRING;
1083 break;
1084 case V4L2_CID_ISO_SENSITIVITY:
1085 case V4L2_CID_AUTO_EXPOSURE_BIAS:
1086 case V4L2_CID_MPEG_VIDEO_VPX_NUM_PARTITIONS:
1087 case V4L2_CID_MPEG_VIDEO_VPX_NUM_REF_FRAMES:
1088 *type = V4L2_CTRL_TYPE_INTEGER_MENU;
1089 break;
1090 case V4L2_CID_USER_CLASS:
1091 case V4L2_CID_CAMERA_CLASS:
1092 case V4L2_CID_MPEG_CLASS:
1093 case V4L2_CID_FM_TX_CLASS:
1094 case V4L2_CID_FLASH_CLASS:
1095 case V4L2_CID_JPEG_CLASS:
1096 case V4L2_CID_IMAGE_SOURCE_CLASS:
1097 case V4L2_CID_IMAGE_PROC_CLASS:
1098 case V4L2_CID_DV_CLASS:
1099 case V4L2_CID_FM_RX_CLASS:
1100 case V4L2_CID_RF_TUNER_CLASS:
1101 case V4L2_CID_DETECT_CLASS:
1102 *type = V4L2_CTRL_TYPE_CTRL_CLASS;
1103 /* You can neither read not write these */
1104 *flags |= V4L2_CTRL_FLAG_READ_ONLY | V4L2_CTRL_FLAG_WRITE_ONLY;
1105 *min = *max = *step = *def = 0;
1106 break;
1107 case V4L2_CID_BG_COLOR:
1108 *type = V4L2_CTRL_TYPE_INTEGER;
1109 *step = 1;
1110 *min = 0;
1111 /* Max is calculated as RGB888 that is 2^24 */
1112 *max = 0xFFFFFF;
1113 break;
1114 case V4L2_CID_FLASH_FAULT:
1115 case V4L2_CID_JPEG_ACTIVE_MARKER:
1116 case V4L2_CID_3A_LOCK:
1117 case V4L2_CID_AUTO_FOCUS_STATUS:
1118 case V4L2_CID_DV_TX_HOTPLUG:
1119 case V4L2_CID_DV_TX_RXSENSE:
1120 case V4L2_CID_DV_TX_EDID_PRESENT:
1121 case V4L2_CID_DV_RX_POWER_PRESENT:
1122 *type = V4L2_CTRL_TYPE_BITMASK;
1123 break;
1124 case V4L2_CID_MIN_BUFFERS_FOR_CAPTURE:
1125 case V4L2_CID_MIN_BUFFERS_FOR_OUTPUT:
1126 *type = V4L2_CTRL_TYPE_INTEGER;
1127 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
1128 break;
1129 case V4L2_CID_MPEG_VIDEO_DEC_PTS:
1130 *type = V4L2_CTRL_TYPE_INTEGER64;
1131 *flags |= V4L2_CTRL_FLAG_VOLATILE | V4L2_CTRL_FLAG_READ_ONLY;
1132 *min = *def = 0;
1133 *max = 0x1ffffffffLL;
1134 *step = 1;
1135 break;
1136 case V4L2_CID_MPEG_VIDEO_DEC_FRAME:
1137 *type = V4L2_CTRL_TYPE_INTEGER64;
1138 *flags |= V4L2_CTRL_FLAG_VOLATILE | V4L2_CTRL_FLAG_READ_ONLY;
1139 *min = *def = 0;
1140 *max = 0x7fffffffffffffffLL;
1141 *step = 1;
1142 break;
1143 case V4L2_CID_PIXEL_RATE:
1144 *type = V4L2_CTRL_TYPE_INTEGER64;
1145 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
1146 break;
1147 case V4L2_CID_DETECT_MD_REGION_GRID:
1148 *type = V4L2_CTRL_TYPE_U8;
1149 break;
1150 case V4L2_CID_DETECT_MD_THRESHOLD_GRID:
1151 *type = V4L2_CTRL_TYPE_U16;
1152 break;
1153 case V4L2_CID_RDS_TX_ALT_FREQS:
1154 *type = V4L2_CTRL_TYPE_U32;
1155 break;
1156 default:
1157 *type = V4L2_CTRL_TYPE_INTEGER;
1158 break;
1159 }
1160 switch (id) {
1161 case V4L2_CID_MPEG_AUDIO_ENCODING:
1162 case V4L2_CID_MPEG_AUDIO_MODE:
1163 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
1164 case V4L2_CID_MPEG_VIDEO_B_FRAMES:
1165 case V4L2_CID_MPEG_STREAM_TYPE:
1166 *flags |= V4L2_CTRL_FLAG_UPDATE;
1167 break;
1168 case V4L2_CID_AUDIO_VOLUME:
1169 case V4L2_CID_AUDIO_BALANCE:
1170 case V4L2_CID_AUDIO_BASS:
1171 case V4L2_CID_AUDIO_TREBLE:
1172 case V4L2_CID_BRIGHTNESS:
1173 case V4L2_CID_CONTRAST:
1174 case V4L2_CID_SATURATION:
1175 case V4L2_CID_HUE:
1176 case V4L2_CID_RED_BALANCE:
1177 case V4L2_CID_BLUE_BALANCE:
1178 case V4L2_CID_GAMMA:
1179 case V4L2_CID_SHARPNESS:
1180 case V4L2_CID_CHROMA_GAIN:
1181 case V4L2_CID_RDS_TX_DEVIATION:
1182 case V4L2_CID_AUDIO_LIMITER_RELEASE_TIME:
1183 case V4L2_CID_AUDIO_LIMITER_DEVIATION:
1184 case V4L2_CID_AUDIO_COMPRESSION_GAIN:
1185 case V4L2_CID_AUDIO_COMPRESSION_THRESHOLD:
1186 case V4L2_CID_AUDIO_COMPRESSION_ATTACK_TIME:
1187 case V4L2_CID_AUDIO_COMPRESSION_RELEASE_TIME:
1188 case V4L2_CID_PILOT_TONE_DEVIATION:
1189 case V4L2_CID_PILOT_TONE_FREQUENCY:
1190 case V4L2_CID_TUNE_POWER_LEVEL:
1191 case V4L2_CID_TUNE_ANTENNA_CAPACITOR:
1192 case V4L2_CID_RF_TUNER_RF_GAIN:
1193 case V4L2_CID_RF_TUNER_LNA_GAIN:
1194 case V4L2_CID_RF_TUNER_MIXER_GAIN:
1195 case V4L2_CID_RF_TUNER_IF_GAIN:
1196 case V4L2_CID_RF_TUNER_BANDWIDTH:
1197 case V4L2_CID_DETECT_MD_GLOBAL_THRESHOLD:
1198 *flags |= V4L2_CTRL_FLAG_SLIDER;
1199 break;
1200 case V4L2_CID_PAN_RELATIVE:
1201 case V4L2_CID_TILT_RELATIVE:
1202 case V4L2_CID_FOCUS_RELATIVE:
1203 case V4L2_CID_IRIS_RELATIVE:
1204 case V4L2_CID_ZOOM_RELATIVE:
1205 *flags |= V4L2_CTRL_FLAG_WRITE_ONLY |
1206 V4L2_CTRL_FLAG_EXECUTE_ON_WRITE;
1207 break;
1208 case V4L2_CID_FLASH_STROBE_STATUS:
1209 case V4L2_CID_AUTO_FOCUS_STATUS:
1210 case V4L2_CID_FLASH_READY:
1211 case V4L2_CID_DV_TX_HOTPLUG:
1212 case V4L2_CID_DV_TX_RXSENSE:
1213 case V4L2_CID_DV_TX_EDID_PRESENT:
1214 case V4L2_CID_DV_RX_POWER_PRESENT:
1215 case V4L2_CID_DV_RX_IT_CONTENT_TYPE:
1216 case V4L2_CID_RDS_RX_PTY:
1217 case V4L2_CID_RDS_RX_PS_NAME:
1218 case V4L2_CID_RDS_RX_RADIO_TEXT:
1219 case V4L2_CID_RDS_RX_TRAFFIC_ANNOUNCEMENT:
1220 case V4L2_CID_RDS_RX_TRAFFIC_PROGRAM:
1221 case V4L2_CID_RDS_RX_MUSIC_SPEECH:
1222 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
1223 break;
1224 case V4L2_CID_RF_TUNER_PLL_LOCK:
1225 *flags |= V4L2_CTRL_FLAG_VOLATILE;
1226 break;
1227 }
1228 }
1229 EXPORT_SYMBOL(v4l2_ctrl_fill);
1230
1231 static u32 user_flags(const struct v4l2_ctrl *ctrl)
1232 {
1233 u32 flags = ctrl->flags;
1234
1235 if (ctrl->is_ptr)
1236 flags |= V4L2_CTRL_FLAG_HAS_PAYLOAD;
1237
1238 return flags;
1239 }
1240
1241 static void fill_event(struct v4l2_event *ev, struct v4l2_ctrl *ctrl, u32 changes)
1242 {
1243 memset(ev, 0, sizeof(*ev));
1244 ev->type = V4L2_EVENT_CTRL;
1245 ev->id = ctrl->id;
1246 ev->u.ctrl.changes = changes;
1247 ev->u.ctrl.type = ctrl->type;
1248 ev->u.ctrl.flags = user_flags(ctrl);
1249 if (ctrl->is_ptr)
1250 ev->u.ctrl.value64 = 0;
1251 else
1252 ev->u.ctrl.value64 = *ctrl->p_cur.p_s64;
1253 ev->u.ctrl.minimum = ctrl->minimum;
1254 ev->u.ctrl.maximum = ctrl->maximum;
1255 if (ctrl->type == V4L2_CTRL_TYPE_MENU
1256 || ctrl->type == V4L2_CTRL_TYPE_INTEGER_MENU)
1257 ev->u.ctrl.step = 1;
1258 else
1259 ev->u.ctrl.step = ctrl->step;
1260 ev->u.ctrl.default_value = ctrl->default_value;
1261 }
1262
1263 static void send_event(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, u32 changes)
1264 {
1265 struct v4l2_event ev;
1266 struct v4l2_subscribed_event *sev;
1267
1268 if (list_empty(&ctrl->ev_subs))
1269 return;
1270 fill_event(&ev, ctrl, changes);
1271
1272 list_for_each_entry(sev, &ctrl->ev_subs, node)
1273 if (sev->fh != fh ||
1274 (sev->flags & V4L2_EVENT_SUB_FL_ALLOW_FEEDBACK))
1275 v4l2_event_queue_fh(sev->fh, &ev);
1276 }
1277
1278 static bool std_equal(const struct v4l2_ctrl *ctrl, u32 idx,
1279 union v4l2_ctrl_ptr ptr1,
1280 union v4l2_ctrl_ptr ptr2)
1281 {
1282 switch (ctrl->type) {
1283 case V4L2_CTRL_TYPE_BUTTON:
1284 return false;
1285 case V4L2_CTRL_TYPE_STRING:
1286 idx *= ctrl->elem_size;
1287 /* strings are always 0-terminated */
1288 return !strcmp(ptr1.p_char + idx, ptr2.p_char + idx);
1289 case V4L2_CTRL_TYPE_INTEGER64:
1290 return ptr1.p_s64[idx] == ptr2.p_s64[idx];
1291 case V4L2_CTRL_TYPE_U8:
1292 return ptr1.p_u8[idx] == ptr2.p_u8[idx];
1293 case V4L2_CTRL_TYPE_U16:
1294 return ptr1.p_u16[idx] == ptr2.p_u16[idx];
1295 case V4L2_CTRL_TYPE_U32:
1296 return ptr1.p_u32[idx] == ptr2.p_u32[idx];
1297 default:
1298 if (ctrl->is_int)
1299 return ptr1.p_s32[idx] == ptr2.p_s32[idx];
1300 idx *= ctrl->elem_size;
1301 return !memcmp(ptr1.p + idx, ptr2.p + idx, ctrl->elem_size);
1302 }
1303 }
1304
1305 static void std_init(const struct v4l2_ctrl *ctrl, u32 idx,
1306 union v4l2_ctrl_ptr ptr)
1307 {
1308 switch (ctrl->type) {
1309 case V4L2_CTRL_TYPE_STRING:
1310 idx *= ctrl->elem_size;
1311 memset(ptr.p_char + idx, ' ', ctrl->minimum);
1312 ptr.p_char[idx + ctrl->minimum] = '\0';
1313 break;
1314 case V4L2_CTRL_TYPE_INTEGER64:
1315 ptr.p_s64[idx] = ctrl->default_value;
1316 break;
1317 case V4L2_CTRL_TYPE_INTEGER:
1318 case V4L2_CTRL_TYPE_INTEGER_MENU:
1319 case V4L2_CTRL_TYPE_MENU:
1320 case V4L2_CTRL_TYPE_BITMASK:
1321 case V4L2_CTRL_TYPE_BOOLEAN:
1322 ptr.p_s32[idx] = ctrl->default_value;
1323 break;
1324 case V4L2_CTRL_TYPE_U8:
1325 ptr.p_u8[idx] = ctrl->default_value;
1326 break;
1327 case V4L2_CTRL_TYPE_U16:
1328 ptr.p_u16[idx] = ctrl->default_value;
1329 break;
1330 case V4L2_CTRL_TYPE_U32:
1331 ptr.p_u32[idx] = ctrl->default_value;
1332 break;
1333 default:
1334 idx *= ctrl->elem_size;
1335 memset(ptr.p + idx, 0, ctrl->elem_size);
1336 break;
1337 }
1338 }
1339
1340 static void std_log(const struct v4l2_ctrl *ctrl)
1341 {
1342 union v4l2_ctrl_ptr ptr = ctrl->p_cur;
1343
1344 if (ctrl->is_array) {
1345 unsigned i;
1346
1347 for (i = 0; i < ctrl->nr_of_dims; i++)
1348 pr_cont("[%u]", ctrl->dims[i]);
1349 pr_cont(" ");
1350 }
1351
1352 switch (ctrl->type) {
1353 case V4L2_CTRL_TYPE_INTEGER:
1354 pr_cont("%d", *ptr.p_s32);
1355 break;
1356 case V4L2_CTRL_TYPE_BOOLEAN:
1357 pr_cont("%s", *ptr.p_s32 ? "true" : "false");
1358 break;
1359 case V4L2_CTRL_TYPE_MENU:
1360 pr_cont("%s", ctrl->qmenu[*ptr.p_s32]);
1361 break;
1362 case V4L2_CTRL_TYPE_INTEGER_MENU:
1363 pr_cont("%lld", ctrl->qmenu_int[*ptr.p_s32]);
1364 break;
1365 case V4L2_CTRL_TYPE_BITMASK:
1366 pr_cont("0x%08x", *ptr.p_s32);
1367 break;
1368 case V4L2_CTRL_TYPE_INTEGER64:
1369 pr_cont("%lld", *ptr.p_s64);
1370 break;
1371 case V4L2_CTRL_TYPE_STRING:
1372 pr_cont("%s", ptr.p_char);
1373 break;
1374 case V4L2_CTRL_TYPE_U8:
1375 pr_cont("%u", (unsigned)*ptr.p_u8);
1376 break;
1377 case V4L2_CTRL_TYPE_U16:
1378 pr_cont("%u", (unsigned)*ptr.p_u16);
1379 break;
1380 case V4L2_CTRL_TYPE_U32:
1381 pr_cont("%u", (unsigned)*ptr.p_u32);
1382 break;
1383 default:
1384 pr_cont("unknown type %d", ctrl->type);
1385 break;
1386 }
1387 }
1388
1389 /*
1390 * Round towards the closest legal value. Be careful when we are
1391 * close to the maximum range of the control type to prevent
1392 * wrap-arounds.
1393 */
1394 #define ROUND_TO_RANGE(val, offset_type, ctrl) \
1395 ({ \
1396 offset_type offset; \
1397 if ((ctrl)->maximum >= 0 && \
1398 val >= (ctrl)->maximum - (s32)((ctrl)->step / 2)) \
1399 val = (ctrl)->maximum; \
1400 else \
1401 val += (s32)((ctrl)->step / 2); \
1402 val = clamp_t(typeof(val), val, \
1403 (ctrl)->minimum, (ctrl)->maximum); \
1404 offset = (val) - (ctrl)->minimum; \
1405 offset = (ctrl)->step * (offset / (u32)(ctrl)->step); \
1406 val = (ctrl)->minimum + offset; \
1407 0; \
1408 })
1409
1410 /* Validate a new control */
1411 static int std_validate(const struct v4l2_ctrl *ctrl, u32 idx,
1412 union v4l2_ctrl_ptr ptr)
1413 {
1414 size_t len;
1415 u64 offset;
1416 s64 val;
1417
1418 switch (ctrl->type) {
1419 case V4L2_CTRL_TYPE_INTEGER:
1420 return ROUND_TO_RANGE(ptr.p_s32[idx], u32, ctrl);
1421 case V4L2_CTRL_TYPE_INTEGER64:
1422 /*
1423 * We can't use the ROUND_TO_RANGE define here due to
1424 * the u64 divide that needs special care.
1425 */
1426 val = ptr.p_s64[idx];
1427 if (ctrl->maximum >= 0 && val >= ctrl->maximum - (s64)(ctrl->step / 2))
1428 val = ctrl->maximum;
1429 else
1430 val += (s64)(ctrl->step / 2);
1431 val = clamp_t(s64, val, ctrl->minimum, ctrl->maximum);
1432 offset = val - ctrl->minimum;
1433 do_div(offset, ctrl->step);
1434 ptr.p_s64[idx] = ctrl->minimum + offset * ctrl->step;
1435 return 0;
1436 case V4L2_CTRL_TYPE_U8:
1437 return ROUND_TO_RANGE(ptr.p_u8[idx], u8, ctrl);
1438 case V4L2_CTRL_TYPE_U16:
1439 return ROUND_TO_RANGE(ptr.p_u16[idx], u16, ctrl);
1440 case V4L2_CTRL_TYPE_U32:
1441 return ROUND_TO_RANGE(ptr.p_u32[idx], u32, ctrl);
1442
1443 case V4L2_CTRL_TYPE_BOOLEAN:
1444 ptr.p_s32[idx] = !!ptr.p_s32[idx];
1445 return 0;
1446
1447 case V4L2_CTRL_TYPE_MENU:
1448 case V4L2_CTRL_TYPE_INTEGER_MENU:
1449 if (ptr.p_s32[idx] < ctrl->minimum || ptr.p_s32[idx] > ctrl->maximum)
1450 return -ERANGE;
1451 if (ctrl->menu_skip_mask & (1 << ptr.p_s32[idx]))
1452 return -EINVAL;
1453 if (ctrl->type == V4L2_CTRL_TYPE_MENU &&
1454 ctrl->qmenu[ptr.p_s32[idx]][0] == '\0')
1455 return -EINVAL;
1456 return 0;
1457
1458 case V4L2_CTRL_TYPE_BITMASK:
1459 ptr.p_s32[idx] &= ctrl->maximum;
1460 return 0;
1461
1462 case V4L2_CTRL_TYPE_BUTTON:
1463 case V4L2_CTRL_TYPE_CTRL_CLASS:
1464 ptr.p_s32[idx] = 0;
1465 return 0;
1466
1467 case V4L2_CTRL_TYPE_STRING:
1468 idx *= ctrl->elem_size;
1469 len = strlen(ptr.p_char + idx);
1470 if (len < ctrl->minimum)
1471 return -ERANGE;
1472 if ((len - (u32)ctrl->minimum) % (u32)ctrl->step)
1473 return -ERANGE;
1474 return 0;
1475
1476 default:
1477 return -EINVAL;
1478 }
1479 }
1480
1481 static const struct v4l2_ctrl_type_ops std_type_ops = {
1482 .equal = std_equal,
1483 .init = std_init,
1484 .log = std_log,
1485 .validate = std_validate,
1486 };
1487
1488 /* Helper function: copy the given control value back to the caller */
1489 static int ptr_to_user(struct v4l2_ext_control *c,
1490 struct v4l2_ctrl *ctrl,
1491 union v4l2_ctrl_ptr ptr)
1492 {
1493 u32 len;
1494
1495 if (ctrl->is_ptr && !ctrl->is_string)
1496 return copy_to_user(c->ptr, ptr.p, c->size) ?
1497 -EFAULT : 0;
1498
1499 switch (ctrl->type) {
1500 case V4L2_CTRL_TYPE_STRING:
1501 len = strlen(ptr.p_char);
1502 if (c->size < len + 1) {
1503 c->size = ctrl->elem_size;
1504 return -ENOSPC;
1505 }
1506 return copy_to_user(c->string, ptr.p_char, len + 1) ?
1507 -EFAULT : 0;
1508 case V4L2_CTRL_TYPE_INTEGER64:
1509 c->value64 = *ptr.p_s64;
1510 break;
1511 default:
1512 c->value = *ptr.p_s32;
1513 break;
1514 }
1515 return 0;
1516 }
1517
1518 /* Helper function: copy the current control value back to the caller */
1519 static int cur_to_user(struct v4l2_ext_control *c,
1520 struct v4l2_ctrl *ctrl)
1521 {
1522 return ptr_to_user(c, ctrl, ctrl->p_cur);
1523 }
1524
1525 /* Helper function: copy the new control value back to the caller */
1526 static int new_to_user(struct v4l2_ext_control *c,
1527 struct v4l2_ctrl *ctrl)
1528 {
1529 return ptr_to_user(c, ctrl, ctrl->p_new);
1530 }
1531
1532 /* Helper function: copy the initial control value back to the caller */
1533 static int def_to_user(struct v4l2_ext_control *c, struct v4l2_ctrl *ctrl)
1534 {
1535 int idx;
1536
1537 for (idx = 0; idx < ctrl->elems; idx++)
1538 ctrl->type_ops->init(ctrl, idx, ctrl->p_new);
1539
1540 return ptr_to_user(c, ctrl, ctrl->p_new);
1541 }
1542
1543 /* Helper function: copy the caller-provider value to the given control value */
1544 static int user_to_ptr(struct v4l2_ext_control *c,
1545 struct v4l2_ctrl *ctrl,
1546 union v4l2_ctrl_ptr ptr)
1547 {
1548 int ret;
1549 u32 size;
1550
1551 ctrl->is_new = 1;
1552 if (ctrl->is_ptr && !ctrl->is_string) {
1553 unsigned idx;
1554
1555 ret = copy_from_user(ptr.p, c->ptr, c->size) ? -EFAULT : 0;
1556 if (ret || !ctrl->is_array)
1557 return ret;
1558 for (idx = c->size / ctrl->elem_size; idx < ctrl->elems; idx++)
1559 ctrl->type_ops->init(ctrl, idx, ptr);
1560 return 0;
1561 }
1562
1563 switch (ctrl->type) {
1564 case V4L2_CTRL_TYPE_INTEGER64:
1565 *ptr.p_s64 = c->value64;
1566 break;
1567 case V4L2_CTRL_TYPE_STRING:
1568 size = c->size;
1569 if (size == 0)
1570 return -ERANGE;
1571 if (size > ctrl->maximum + 1)
1572 size = ctrl->maximum + 1;
1573 ret = copy_from_user(ptr.p_char, c->string, size) ? -EFAULT : 0;
1574 if (!ret) {
1575 char last = ptr.p_char[size - 1];
1576
1577 ptr.p_char[size - 1] = 0;
1578 /* If the string was longer than ctrl->maximum,
1579 then return an error. */
1580 if (strlen(ptr.p_char) == ctrl->maximum && last)
1581 return -ERANGE;
1582 }
1583 return ret;
1584 default:
1585 *ptr.p_s32 = c->value;
1586 break;
1587 }
1588 return 0;
1589 }
1590
1591 /* Helper function: copy the caller-provider value as the new control value */
1592 static int user_to_new(struct v4l2_ext_control *c,
1593 struct v4l2_ctrl *ctrl)
1594 {
1595 return user_to_ptr(c, ctrl, ctrl->p_new);
1596 }
1597
1598 /* Copy the one value to another. */
1599 static void ptr_to_ptr(struct v4l2_ctrl *ctrl,
1600 union v4l2_ctrl_ptr from, union v4l2_ctrl_ptr to)
1601 {
1602 if (ctrl == NULL)
1603 return;
1604 memcpy(to.p, from.p, ctrl->elems * ctrl->elem_size);
1605 }
1606
1607 /* Copy the new value to the current value. */
1608 static void new_to_cur(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, u32 ch_flags)
1609 {
1610 bool changed;
1611
1612 if (ctrl == NULL)
1613 return;
1614
1615 /* has_changed is set by cluster_changed */
1616 changed = ctrl->has_changed;
1617 if (changed)
1618 ptr_to_ptr(ctrl, ctrl->p_new, ctrl->p_cur);
1619
1620 if (ch_flags & V4L2_EVENT_CTRL_CH_FLAGS) {
1621 /* Note: CH_FLAGS is only set for auto clusters. */
1622 ctrl->flags &=
1623 ~(V4L2_CTRL_FLAG_INACTIVE | V4L2_CTRL_FLAG_VOLATILE);
1624 if (!is_cur_manual(ctrl->cluster[0])) {
1625 ctrl->flags |= V4L2_CTRL_FLAG_INACTIVE;
1626 if (ctrl->cluster[0]->has_volatiles)
1627 ctrl->flags |= V4L2_CTRL_FLAG_VOLATILE;
1628 }
1629 fh = NULL;
1630 }
1631 if (changed || ch_flags) {
1632 /* If a control was changed that was not one of the controls
1633 modified by the application, then send the event to all. */
1634 if (!ctrl->is_new)
1635 fh = NULL;
1636 send_event(fh, ctrl,
1637 (changed ? V4L2_EVENT_CTRL_CH_VALUE : 0) | ch_flags);
1638 if (ctrl->call_notify && changed && ctrl->handler->notify)
1639 ctrl->handler->notify(ctrl, ctrl->handler->notify_priv);
1640 }
1641 }
1642
1643 /* Copy the current value to the new value */
1644 static void cur_to_new(struct v4l2_ctrl *ctrl)
1645 {
1646 if (ctrl == NULL)
1647 return;
1648 ptr_to_ptr(ctrl, ctrl->p_cur, ctrl->p_new);
1649 }
1650
1651 /* Return non-zero if one or more of the controls in the cluster has a new
1652 value that differs from the current value. */
1653 static int cluster_changed(struct v4l2_ctrl *master)
1654 {
1655 bool changed = false;
1656 unsigned idx;
1657 int i;
1658
1659 for (i = 0; i < master->ncontrols; i++) {
1660 struct v4l2_ctrl *ctrl = master->cluster[i];
1661 bool ctrl_changed = false;
1662
1663 if (ctrl == NULL)
1664 continue;
1665
1666 if (ctrl->flags & V4L2_CTRL_FLAG_EXECUTE_ON_WRITE)
1667 changed = ctrl_changed = true;
1668
1669 /*
1670 * Set has_changed to false to avoid generating
1671 * the event V4L2_EVENT_CTRL_CH_VALUE
1672 */
1673 if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE) {
1674 ctrl->has_changed = false;
1675 continue;
1676 }
1677
1678 for (idx = 0; !ctrl_changed && idx < ctrl->elems; idx++)
1679 ctrl_changed = !ctrl->type_ops->equal(ctrl, idx,
1680 ctrl->p_cur, ctrl->p_new);
1681 ctrl->has_changed = ctrl_changed;
1682 changed |= ctrl->has_changed;
1683 }
1684 return changed;
1685 }
1686
1687 /* Control range checking */
1688 static int check_range(enum v4l2_ctrl_type type,
1689 s64 min, s64 max, u64 step, s64 def)
1690 {
1691 switch (type) {
1692 case V4L2_CTRL_TYPE_BOOLEAN:
1693 if (step != 1 || max > 1 || min < 0)
1694 return -ERANGE;
1695 /* fall through */
1696 case V4L2_CTRL_TYPE_U8:
1697 case V4L2_CTRL_TYPE_U16:
1698 case V4L2_CTRL_TYPE_U32:
1699 case V4L2_CTRL_TYPE_INTEGER:
1700 case V4L2_CTRL_TYPE_INTEGER64:
1701 if (step == 0 || min > max || def < min || def > max)
1702 return -ERANGE;
1703 return 0;
1704 case V4L2_CTRL_TYPE_BITMASK:
1705 if (step || min || !max || (def & ~max))
1706 return -ERANGE;
1707 return 0;
1708 case V4L2_CTRL_TYPE_MENU:
1709 case V4L2_CTRL_TYPE_INTEGER_MENU:
1710 if (min > max || def < min || def > max)
1711 return -ERANGE;
1712 /* Note: step == menu_skip_mask for menu controls.
1713 So here we check if the default value is masked out. */
1714 if (step && ((1 << def) & step))
1715 return -EINVAL;
1716 return 0;
1717 case V4L2_CTRL_TYPE_STRING:
1718 if (min > max || min < 0 || step < 1 || def)
1719 return -ERANGE;
1720 return 0;
1721 default:
1722 return 0;
1723 }
1724 }
1725
1726 /* Validate a new control */
1727 static int validate_new(const struct v4l2_ctrl *ctrl, union v4l2_ctrl_ptr p_new)
1728 {
1729 unsigned idx;
1730 int err = 0;
1731
1732 for (idx = 0; !err && idx < ctrl->elems; idx++)
1733 err = ctrl->type_ops->validate(ctrl, idx, p_new);
1734 return err;
1735 }
1736
1737 static inline u32 node2id(struct list_head *node)
1738 {
1739 return list_entry(node, struct v4l2_ctrl_ref, node)->ctrl->id;
1740 }
1741
1742 /* Set the handler's error code if it wasn't set earlier already */
1743 static inline int handler_set_err(struct v4l2_ctrl_handler *hdl, int err)
1744 {
1745 if (hdl->error == 0)
1746 hdl->error = err;
1747 return err;
1748 }
1749
1750 /* Initialize the handler */
1751 int v4l2_ctrl_handler_init_class(struct v4l2_ctrl_handler *hdl,
1752 unsigned nr_of_controls_hint,
1753 struct lock_class_key *key, const char *name)
1754 {
1755 mutex_init(&hdl->_lock);
1756 hdl->lock = &hdl->_lock;
1757 lockdep_set_class_and_name(hdl->lock, key, name);
1758 INIT_LIST_HEAD(&hdl->ctrls);
1759 INIT_LIST_HEAD(&hdl->ctrl_refs);
1760 hdl->nr_of_buckets = 1 + nr_of_controls_hint / 8;
1761 hdl->buckets = kvmalloc_array(hdl->nr_of_buckets,
1762 sizeof(hdl->buckets[0]),
1763 GFP_KERNEL | __GFP_ZERO);
1764 hdl->error = hdl->buckets ? 0 : -ENOMEM;
1765 return hdl->error;
1766 }
1767 EXPORT_SYMBOL(v4l2_ctrl_handler_init_class);
1768
1769 /* Free all controls and control refs */
1770 void v4l2_ctrl_handler_free(struct v4l2_ctrl_handler *hdl)
1771 {
1772 struct v4l2_ctrl_ref *ref, *next_ref;
1773 struct v4l2_ctrl *ctrl, *next_ctrl;
1774 struct v4l2_subscribed_event *sev, *next_sev;
1775
1776 if (hdl == NULL || hdl->buckets == NULL)
1777 return;
1778
1779 mutex_lock(hdl->lock);
1780 /* Free all nodes */
1781 list_for_each_entry_safe(ref, next_ref, &hdl->ctrl_refs, node) {
1782 list_del(&ref->node);
1783 kfree(ref);
1784 }
1785 /* Free all controls owned by the handler */
1786 list_for_each_entry_safe(ctrl, next_ctrl, &hdl->ctrls, node) {
1787 list_del(&ctrl->node);
1788 list_for_each_entry_safe(sev, next_sev, &ctrl->ev_subs, node)
1789 list_del(&sev->node);
1790 kvfree(ctrl);
1791 }
1792 kvfree(hdl->buckets);
1793 hdl->buckets = NULL;
1794 hdl->cached = NULL;
1795 hdl->error = 0;
1796 mutex_unlock(hdl->lock);
1797 mutex_destroy(&hdl->_lock);
1798 }
1799 EXPORT_SYMBOL(v4l2_ctrl_handler_free);
1800
1801 /* For backwards compatibility: V4L2_CID_PRIVATE_BASE should no longer
1802 be used except in G_CTRL, S_CTRL, QUERYCTRL and QUERYMENU when dealing
1803 with applications that do not use the NEXT_CTRL flag.
1804
1805 We just find the n-th private user control. It's O(N), but that should not
1806 be an issue in this particular case. */
1807 static struct v4l2_ctrl_ref *find_private_ref(
1808 struct v4l2_ctrl_handler *hdl, u32 id)
1809 {
1810 struct v4l2_ctrl_ref *ref;
1811
1812 id -= V4L2_CID_PRIVATE_BASE;
1813 list_for_each_entry(ref, &hdl->ctrl_refs, node) {
1814 /* Search for private user controls that are compatible with
1815 VIDIOC_G/S_CTRL. */
1816 if (V4L2_CTRL_ID2WHICH(ref->ctrl->id) == V4L2_CTRL_CLASS_USER &&
1817 V4L2_CTRL_DRIVER_PRIV(ref->ctrl->id)) {
1818 if (!ref->ctrl->is_int)
1819 continue;
1820 if (id == 0)
1821 return ref;
1822 id--;
1823 }
1824 }
1825 return NULL;
1826 }
1827
1828 /* Find a control with the given ID. */
1829 static struct v4l2_ctrl_ref *find_ref(struct v4l2_ctrl_handler *hdl, u32 id)
1830 {
1831 struct v4l2_ctrl_ref *ref;
1832 int bucket;
1833
1834 id &= V4L2_CTRL_ID_MASK;
1835
1836 /* Old-style private controls need special handling */
1837 if (id >= V4L2_CID_PRIVATE_BASE)
1838 return find_private_ref(hdl, id);
1839 bucket = id % hdl->nr_of_buckets;
1840
1841 /* Simple optimization: cache the last control found */
1842 if (hdl->cached && hdl->cached->ctrl->id == id)
1843 return hdl->cached;
1844
1845 /* Not in cache, search the hash */
1846 ref = hdl->buckets ? hdl->buckets[bucket] : NULL;
1847 while (ref && ref->ctrl->id != id)
1848 ref = ref->next;
1849
1850 if (ref)
1851 hdl->cached = ref; /* cache it! */
1852 return ref;
1853 }
1854
1855 /* Find a control with the given ID. Take the handler's lock first. */
1856 static struct v4l2_ctrl_ref *find_ref_lock(
1857 struct v4l2_ctrl_handler *hdl, u32 id)
1858 {
1859 struct v4l2_ctrl_ref *ref = NULL;
1860
1861 if (hdl) {
1862 mutex_lock(hdl->lock);
1863 ref = find_ref(hdl, id);
1864 mutex_unlock(hdl->lock);
1865 }
1866 return ref;
1867 }
1868
1869 /* Find a control with the given ID. */
1870 struct v4l2_ctrl *v4l2_ctrl_find(struct v4l2_ctrl_handler *hdl, u32 id)
1871 {
1872 struct v4l2_ctrl_ref *ref = find_ref_lock(hdl, id);
1873
1874 return ref ? ref->ctrl : NULL;
1875 }
1876 EXPORT_SYMBOL(v4l2_ctrl_find);
1877
1878 /* Allocate a new v4l2_ctrl_ref and hook it into the handler. */
1879 static int handler_new_ref(struct v4l2_ctrl_handler *hdl,
1880 struct v4l2_ctrl *ctrl)
1881 {
1882 struct v4l2_ctrl_ref *ref;
1883 struct v4l2_ctrl_ref *new_ref;
1884 u32 id = ctrl->id;
1885 u32 class_ctrl = V4L2_CTRL_ID2WHICH(id) | 1;
1886 int bucket = id % hdl->nr_of_buckets; /* which bucket to use */
1887
1888 /*
1889 * Automatically add the control class if it is not yet present and
1890 * the new control is not a compound control.
1891 */
1892 if (ctrl->type < V4L2_CTRL_COMPOUND_TYPES &&
1893 id != class_ctrl && find_ref_lock(hdl, class_ctrl) == NULL)
1894 if (!v4l2_ctrl_new_std(hdl, NULL, class_ctrl, 0, 0, 0, 0))
1895 return hdl->error;
1896
1897 if (hdl->error)
1898 return hdl->error;
1899
1900 new_ref = kzalloc(sizeof(*new_ref), GFP_KERNEL);
1901 if (!new_ref)
1902 return handler_set_err(hdl, -ENOMEM);
1903 new_ref->ctrl = ctrl;
1904 if (ctrl->handler == hdl) {
1905 /* By default each control starts in a cluster of its own.
1906 new_ref->ctrl is basically a cluster array with one
1907 element, so that's perfect to use as the cluster pointer.
1908 But only do this for the handler that owns the control. */
1909 ctrl->cluster = &new_ref->ctrl;
1910 ctrl->ncontrols = 1;
1911 }
1912
1913 INIT_LIST_HEAD(&new_ref->node);
1914
1915 mutex_lock(hdl->lock);
1916
1917 /* Add immediately at the end of the list if the list is empty, or if
1918 the last element in the list has a lower ID.
1919 This ensures that when elements are added in ascending order the
1920 insertion is an O(1) operation. */
1921 if (list_empty(&hdl->ctrl_refs) || id > node2id(hdl->ctrl_refs.prev)) {
1922 list_add_tail(&new_ref->node, &hdl->ctrl_refs);
1923 goto insert_in_hash;
1924 }
1925
1926 /* Find insert position in sorted list */
1927 list_for_each_entry(ref, &hdl->ctrl_refs, node) {
1928 if (ref->ctrl->id < id)
1929 continue;
1930 /* Don't add duplicates */
1931 if (ref->ctrl->id == id) {
1932 kfree(new_ref);
1933 goto unlock;
1934 }
1935 list_add(&new_ref->node, ref->node.prev);
1936 break;
1937 }
1938
1939 insert_in_hash:
1940 /* Insert the control node in the hash */
1941 new_ref->next = hdl->buckets[bucket];
1942 hdl->buckets[bucket] = new_ref;
1943
1944 unlock:
1945 mutex_unlock(hdl->lock);
1946 return 0;
1947 }
1948
1949 /* Add a new control */
1950 static struct v4l2_ctrl *v4l2_ctrl_new(struct v4l2_ctrl_handler *hdl,
1951 const struct v4l2_ctrl_ops *ops,
1952 const struct v4l2_ctrl_type_ops *type_ops,
1953 u32 id, const char *name, enum v4l2_ctrl_type type,
1954 s64 min, s64 max, u64 step, s64 def,
1955 const u32 dims[V4L2_CTRL_MAX_DIMS], u32 elem_size,
1956 u32 flags, const char * const *qmenu,
1957 const s64 *qmenu_int, void *priv)
1958 {
1959 struct v4l2_ctrl *ctrl;
1960 unsigned sz_extra;
1961 unsigned nr_of_dims = 0;
1962 unsigned elems = 1;
1963 bool is_array;
1964 unsigned tot_ctrl_size;
1965 unsigned idx;
1966 void *data;
1967 int err;
1968
1969 if (hdl->error)
1970 return NULL;
1971
1972 while (dims && dims[nr_of_dims]) {
1973 elems *= dims[nr_of_dims];
1974 nr_of_dims++;
1975 if (nr_of_dims == V4L2_CTRL_MAX_DIMS)
1976 break;
1977 }
1978 is_array = nr_of_dims > 0;
1979
1980 /* Prefill elem_size for all types handled by std_type_ops */
1981 switch (type) {
1982 case V4L2_CTRL_TYPE_INTEGER64:
1983 elem_size = sizeof(s64);
1984 break;
1985 case V4L2_CTRL_TYPE_STRING:
1986 elem_size = max + 1;
1987 break;
1988 case V4L2_CTRL_TYPE_U8:
1989 elem_size = sizeof(u8);
1990 break;
1991 case V4L2_CTRL_TYPE_U16:
1992 elem_size = sizeof(u16);
1993 break;
1994 case V4L2_CTRL_TYPE_U32:
1995 elem_size = sizeof(u32);
1996 break;
1997 default:
1998 if (type < V4L2_CTRL_COMPOUND_TYPES)
1999 elem_size = sizeof(s32);
2000 break;
2001 }
2002 tot_ctrl_size = elem_size * elems;
2003
2004 /* Sanity checks */
2005 if (id == 0 || name == NULL || !elem_size ||
2006 id >= V4L2_CID_PRIVATE_BASE ||
2007 (type == V4L2_CTRL_TYPE_MENU && qmenu == NULL) ||
2008 (type == V4L2_CTRL_TYPE_INTEGER_MENU && qmenu_int == NULL)) {
2009 handler_set_err(hdl, -ERANGE);
2010 return NULL;
2011 }
2012 err = check_range(type, min, max, step, def);
2013 if (err) {
2014 handler_set_err(hdl, err);
2015 return NULL;
2016 }
2017 if (is_array &&
2018 (type == V4L2_CTRL_TYPE_BUTTON ||
2019 type == V4L2_CTRL_TYPE_CTRL_CLASS)) {
2020 handler_set_err(hdl, -EINVAL);
2021 return NULL;
2022 }
2023
2024 sz_extra = 0;
2025 if (type == V4L2_CTRL_TYPE_BUTTON)
2026 flags |= V4L2_CTRL_FLAG_WRITE_ONLY |
2027 V4L2_CTRL_FLAG_EXECUTE_ON_WRITE;
2028 else if (type == V4L2_CTRL_TYPE_CTRL_CLASS)
2029 flags |= V4L2_CTRL_FLAG_READ_ONLY;
2030 else if (type == V4L2_CTRL_TYPE_INTEGER64 ||
2031 type == V4L2_CTRL_TYPE_STRING ||
2032 type >= V4L2_CTRL_COMPOUND_TYPES ||
2033 is_array)
2034 sz_extra += 2 * tot_ctrl_size;
2035
2036 ctrl = kvzalloc(sizeof(*ctrl) + sz_extra, GFP_KERNEL);
2037 if (ctrl == NULL) {
2038 handler_set_err(hdl, -ENOMEM);
2039 return NULL;
2040 }
2041
2042 INIT_LIST_HEAD(&ctrl->node);
2043 INIT_LIST_HEAD(&ctrl->ev_subs);
2044 ctrl->handler = hdl;
2045 ctrl->ops = ops;
2046 ctrl->type_ops = type_ops ? type_ops : &std_type_ops;
2047 ctrl->id = id;
2048 ctrl->name = name;
2049 ctrl->type = type;
2050 ctrl->flags = flags;
2051 ctrl->minimum = min;
2052 ctrl->maximum = max;
2053 ctrl->step = step;
2054 ctrl->default_value = def;
2055 ctrl->is_string = !is_array && type == V4L2_CTRL_TYPE_STRING;
2056 ctrl->is_ptr = is_array || type >= V4L2_CTRL_COMPOUND_TYPES || ctrl->is_string;
2057 ctrl->is_int = !ctrl->is_ptr && type != V4L2_CTRL_TYPE_INTEGER64;
2058 ctrl->is_array = is_array;
2059 ctrl->elems = elems;
2060 ctrl->nr_of_dims = nr_of_dims;
2061 if (nr_of_dims)
2062 memcpy(ctrl->dims, dims, nr_of_dims * sizeof(dims[0]));
2063 ctrl->elem_size = elem_size;
2064 if (type == V4L2_CTRL_TYPE_MENU)
2065 ctrl->qmenu = qmenu;
2066 else if (type == V4L2_CTRL_TYPE_INTEGER_MENU)
2067 ctrl->qmenu_int = qmenu_int;
2068 ctrl->priv = priv;
2069 ctrl->cur.val = ctrl->val = def;
2070 data = &ctrl[1];
2071
2072 if (!ctrl->is_int) {
2073 ctrl->p_new.p = data;
2074 ctrl->p_cur.p = data + tot_ctrl_size;
2075 } else {
2076 ctrl->p_new.p = &ctrl->val;
2077 ctrl->p_cur.p = &ctrl->cur.val;
2078 }
2079 for (idx = 0; idx < elems; idx++) {
2080 ctrl->type_ops->init(ctrl, idx, ctrl->p_cur);
2081 ctrl->type_ops->init(ctrl, idx, ctrl->p_new);
2082 }
2083
2084 if (handler_new_ref(hdl, ctrl)) {
2085 kvfree(ctrl);
2086 return NULL;
2087 }
2088 mutex_lock(hdl->lock);
2089 list_add_tail(&ctrl->node, &hdl->ctrls);
2090 mutex_unlock(hdl->lock);
2091 return ctrl;
2092 }
2093
2094 struct v4l2_ctrl *v4l2_ctrl_new_custom(struct v4l2_ctrl_handler *hdl,
2095 const struct v4l2_ctrl_config *cfg, void *priv)
2096 {
2097 bool is_menu;
2098 struct v4l2_ctrl *ctrl;
2099 const char *name = cfg->name;
2100 const char * const *qmenu = cfg->qmenu;
2101 const s64 *qmenu_int = cfg->qmenu_int;
2102 enum v4l2_ctrl_type type = cfg->type;
2103 u32 flags = cfg->flags;
2104 s64 min = cfg->min;
2105 s64 max = cfg->max;
2106 u64 step = cfg->step;
2107 s64 def = cfg->def;
2108
2109 if (name == NULL)
2110 v4l2_ctrl_fill(cfg->id, &name, &type, &min, &max, &step,
2111 &def, &flags);
2112
2113 is_menu = (type == V4L2_CTRL_TYPE_MENU ||
2114 type == V4L2_CTRL_TYPE_INTEGER_MENU);
2115 if (is_menu)
2116 WARN_ON(step);
2117 else
2118 WARN_ON(cfg->menu_skip_mask);
2119 if (type == V4L2_CTRL_TYPE_MENU && !qmenu) {
2120 qmenu = v4l2_ctrl_get_menu(cfg->id);
2121 } else if (type == V4L2_CTRL_TYPE_INTEGER_MENU && !qmenu_int) {
2122 handler_set_err(hdl, -EINVAL);
2123 return NULL;
2124 }
2125
2126 ctrl = v4l2_ctrl_new(hdl, cfg->ops, cfg->type_ops, cfg->id, name,
2127 type, min, max,
2128 is_menu ? cfg->menu_skip_mask : step, def,
2129 cfg->dims, cfg->elem_size,
2130 flags, qmenu, qmenu_int, priv);
2131 if (ctrl)
2132 ctrl->is_private = cfg->is_private;
2133 return ctrl;
2134 }
2135 EXPORT_SYMBOL(v4l2_ctrl_new_custom);
2136
2137 /* Helper function for standard non-menu controls */
2138 struct v4l2_ctrl *v4l2_ctrl_new_std(struct v4l2_ctrl_handler *hdl,
2139 const struct v4l2_ctrl_ops *ops,
2140 u32 id, s64 min, s64 max, u64 step, s64 def)
2141 {
2142 const char *name;
2143 enum v4l2_ctrl_type type;
2144 u32 flags;
2145
2146 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
2147 if (type == V4L2_CTRL_TYPE_MENU ||
2148 type == V4L2_CTRL_TYPE_INTEGER_MENU ||
2149 type >= V4L2_CTRL_COMPOUND_TYPES) {
2150 handler_set_err(hdl, -EINVAL);
2151 return NULL;
2152 }
2153 return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
2154 min, max, step, def, NULL, 0,
2155 flags, NULL, NULL, NULL);
2156 }
2157 EXPORT_SYMBOL(v4l2_ctrl_new_std);
2158
2159 /* Helper function for standard menu controls */
2160 struct v4l2_ctrl *v4l2_ctrl_new_std_menu(struct v4l2_ctrl_handler *hdl,
2161 const struct v4l2_ctrl_ops *ops,
2162 u32 id, u8 _max, u64 mask, u8 _def)
2163 {
2164 const char * const *qmenu = NULL;
2165 const s64 *qmenu_int = NULL;
2166 unsigned int qmenu_int_len = 0;
2167 const char *name;
2168 enum v4l2_ctrl_type type;
2169 s64 min;
2170 s64 max = _max;
2171 s64 def = _def;
2172 u64 step;
2173 u32 flags;
2174
2175 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
2176
2177 if (type == V4L2_CTRL_TYPE_MENU)
2178 qmenu = v4l2_ctrl_get_menu(id);
2179 else if (type == V4L2_CTRL_TYPE_INTEGER_MENU)
2180 qmenu_int = v4l2_ctrl_get_int_menu(id, &qmenu_int_len);
2181
2182 if ((!qmenu && !qmenu_int) || (qmenu_int && max > qmenu_int_len)) {
2183 handler_set_err(hdl, -EINVAL);
2184 return NULL;
2185 }
2186 return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
2187 0, max, mask, def, NULL, 0,
2188 flags, qmenu, qmenu_int, NULL);
2189 }
2190 EXPORT_SYMBOL(v4l2_ctrl_new_std_menu);
2191
2192 /* Helper function for standard menu controls with driver defined menu */
2193 struct v4l2_ctrl *v4l2_ctrl_new_std_menu_items(struct v4l2_ctrl_handler *hdl,
2194 const struct v4l2_ctrl_ops *ops, u32 id, u8 _max,
2195 u64 mask, u8 _def, const char * const *qmenu)
2196 {
2197 enum v4l2_ctrl_type type;
2198 const char *name;
2199 u32 flags;
2200 u64 step;
2201 s64 min;
2202 s64 max = _max;
2203 s64 def = _def;
2204
2205 /* v4l2_ctrl_new_std_menu_items() should only be called for
2206 * standard controls without a standard menu.
2207 */
2208 if (v4l2_ctrl_get_menu(id)) {
2209 handler_set_err(hdl, -EINVAL);
2210 return NULL;
2211 }
2212
2213 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
2214 if (type != V4L2_CTRL_TYPE_MENU || qmenu == NULL) {
2215 handler_set_err(hdl, -EINVAL);
2216 return NULL;
2217 }
2218 return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
2219 0, max, mask, def, NULL, 0,
2220 flags, qmenu, NULL, NULL);
2221
2222 }
2223 EXPORT_SYMBOL(v4l2_ctrl_new_std_menu_items);
2224
2225 /* Helper function for standard integer menu controls */
2226 struct v4l2_ctrl *v4l2_ctrl_new_int_menu(struct v4l2_ctrl_handler *hdl,
2227 const struct v4l2_ctrl_ops *ops,
2228 u32 id, u8 _max, u8 _def, const s64 *qmenu_int)
2229 {
2230 const char *name;
2231 enum v4l2_ctrl_type type;
2232 s64 min;
2233 u64 step;
2234 s64 max = _max;
2235 s64 def = _def;
2236 u32 flags;
2237
2238 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
2239 if (type != V4L2_CTRL_TYPE_INTEGER_MENU) {
2240 handler_set_err(hdl, -EINVAL);
2241 return NULL;
2242 }
2243 return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
2244 0, max, 0, def, NULL, 0,
2245 flags, NULL, qmenu_int, NULL);
2246 }
2247 EXPORT_SYMBOL(v4l2_ctrl_new_int_menu);
2248
2249 /* Add the controls from another handler to our own. */
2250 int v4l2_ctrl_add_handler(struct v4l2_ctrl_handler *hdl,
2251 struct v4l2_ctrl_handler *add,
2252 bool (*filter)(const struct v4l2_ctrl *ctrl))
2253 {
2254 struct v4l2_ctrl_ref *ref;
2255 int ret = 0;
2256
2257 /* Do nothing if either handler is NULL or if they are the same */
2258 if (!hdl || !add || hdl == add)
2259 return 0;
2260 if (hdl->error)
2261 return hdl->error;
2262 mutex_lock(add->lock);
2263 list_for_each_entry(ref, &add->ctrl_refs, node) {
2264 struct v4l2_ctrl *ctrl = ref->ctrl;
2265
2266 /* Skip handler-private controls. */
2267 if (ctrl->is_private)
2268 continue;
2269 /* And control classes */
2270 if (ctrl->type == V4L2_CTRL_TYPE_CTRL_CLASS)
2271 continue;
2272 /* Filter any unwanted controls */
2273 if (filter && !filter(ctrl))
2274 continue;
2275 ret = handler_new_ref(hdl, ctrl);
2276 if (ret)
2277 break;
2278 }
2279 mutex_unlock(add->lock);
2280 return ret;
2281 }
2282 EXPORT_SYMBOL(v4l2_ctrl_add_handler);
2283
2284 bool v4l2_ctrl_radio_filter(const struct v4l2_ctrl *ctrl)
2285 {
2286 if (V4L2_CTRL_ID2WHICH(ctrl->id) == V4L2_CTRL_CLASS_FM_TX)
2287 return true;
2288 if (V4L2_CTRL_ID2WHICH(ctrl->id) == V4L2_CTRL_CLASS_FM_RX)
2289 return true;
2290 switch (ctrl->id) {
2291 case V4L2_CID_AUDIO_MUTE:
2292 case V4L2_CID_AUDIO_VOLUME:
2293 case V4L2_CID_AUDIO_BALANCE:
2294 case V4L2_CID_AUDIO_BASS:
2295 case V4L2_CID_AUDIO_TREBLE:
2296 case V4L2_CID_AUDIO_LOUDNESS:
2297 return true;
2298 default:
2299 break;
2300 }
2301 return false;
2302 }
2303 EXPORT_SYMBOL(v4l2_ctrl_radio_filter);
2304
2305 /* Cluster controls */
2306 void v4l2_ctrl_cluster(unsigned ncontrols, struct v4l2_ctrl **controls)
2307 {
2308 bool has_volatiles = false;
2309 int i;
2310
2311 /* The first control is the master control and it must not be NULL */
2312 if (WARN_ON(ncontrols == 0 || controls[0] == NULL))
2313 return;
2314
2315 for (i = 0; i < ncontrols; i++) {
2316 if (controls[i]) {
2317 controls[i]->cluster = controls;
2318 controls[i]->ncontrols = ncontrols;
2319 if (controls[i]->flags & V4L2_CTRL_FLAG_VOLATILE)
2320 has_volatiles = true;
2321 }
2322 }
2323 controls[0]->has_volatiles = has_volatiles;
2324 }
2325 EXPORT_SYMBOL(v4l2_ctrl_cluster);
2326
2327 void v4l2_ctrl_auto_cluster(unsigned ncontrols, struct v4l2_ctrl **controls,
2328 u8 manual_val, bool set_volatile)
2329 {
2330 struct v4l2_ctrl *master = controls[0];
2331 u32 flag = 0;
2332 int i;
2333
2334 v4l2_ctrl_cluster(ncontrols, controls);
2335 WARN_ON(ncontrols <= 1);
2336 WARN_ON(manual_val < master->minimum || manual_val > master->maximum);
2337 WARN_ON(set_volatile && !has_op(master, g_volatile_ctrl));
2338 master->is_auto = true;
2339 master->has_volatiles = set_volatile;
2340 master->manual_mode_value = manual_val;
2341 master->flags |= V4L2_CTRL_FLAG_UPDATE;
2342
2343 if (!is_cur_manual(master))
2344 flag = V4L2_CTRL_FLAG_INACTIVE |
2345 (set_volatile ? V4L2_CTRL_FLAG_VOLATILE : 0);
2346
2347 for (i = 1; i < ncontrols; i++)
2348 if (controls[i])
2349 controls[i]->flags |= flag;
2350 }
2351 EXPORT_SYMBOL(v4l2_ctrl_auto_cluster);
2352
2353 /* Activate/deactivate a control. */
2354 void v4l2_ctrl_activate(struct v4l2_ctrl *ctrl, bool active)
2355 {
2356 /* invert since the actual flag is called 'inactive' */
2357 bool inactive = !active;
2358 bool old;
2359
2360 if (ctrl == NULL)
2361 return;
2362
2363 if (inactive)
2364 /* set V4L2_CTRL_FLAG_INACTIVE */
2365 old = test_and_set_bit(4, &ctrl->flags);
2366 else
2367 /* clear V4L2_CTRL_FLAG_INACTIVE */
2368 old = test_and_clear_bit(4, &ctrl->flags);
2369 if (old != inactive)
2370 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_FLAGS);
2371 }
2372 EXPORT_SYMBOL(v4l2_ctrl_activate);
2373
2374 /* Grab/ungrab a control.
2375 Typically used when streaming starts and you want to grab controls,
2376 preventing the user from changing them.
2377
2378 Just call this and the framework will block any attempts to change
2379 these controls. */
2380 void v4l2_ctrl_grab(struct v4l2_ctrl *ctrl, bool grabbed)
2381 {
2382 bool old;
2383
2384 if (ctrl == NULL)
2385 return;
2386
2387 v4l2_ctrl_lock(ctrl);
2388 if (grabbed)
2389 /* set V4L2_CTRL_FLAG_GRABBED */
2390 old = test_and_set_bit(1, &ctrl->flags);
2391 else
2392 /* clear V4L2_CTRL_FLAG_GRABBED */
2393 old = test_and_clear_bit(1, &ctrl->flags);
2394 if (old != grabbed)
2395 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_FLAGS);
2396 v4l2_ctrl_unlock(ctrl);
2397 }
2398 EXPORT_SYMBOL(v4l2_ctrl_grab);
2399
2400 /* Log the control name and value */
2401 static void log_ctrl(const struct v4l2_ctrl *ctrl,
2402 const char *prefix, const char *colon)
2403 {
2404 if (ctrl->flags & (V4L2_CTRL_FLAG_DISABLED | V4L2_CTRL_FLAG_WRITE_ONLY))
2405 return;
2406 if (ctrl->type == V4L2_CTRL_TYPE_CTRL_CLASS)
2407 return;
2408
2409 pr_info("%s%s%s: ", prefix, colon, ctrl->name);
2410
2411 ctrl->type_ops->log(ctrl);
2412
2413 if (ctrl->flags & (V4L2_CTRL_FLAG_INACTIVE |
2414 V4L2_CTRL_FLAG_GRABBED |
2415 V4L2_CTRL_FLAG_VOLATILE)) {
2416 if (ctrl->flags & V4L2_CTRL_FLAG_INACTIVE)
2417 pr_cont(" inactive");
2418 if (ctrl->flags & V4L2_CTRL_FLAG_GRABBED)
2419 pr_cont(" grabbed");
2420 if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE)
2421 pr_cont(" volatile");
2422 }
2423 pr_cont("\n");
2424 }
2425
2426 /* Log all controls owned by the handler */
2427 void v4l2_ctrl_handler_log_status(struct v4l2_ctrl_handler *hdl,
2428 const char *prefix)
2429 {
2430 struct v4l2_ctrl *ctrl;
2431 const char *colon = "";
2432 int len;
2433
2434 if (hdl == NULL)
2435 return;
2436 if (prefix == NULL)
2437 prefix = "";
2438 len = strlen(prefix);
2439 if (len && prefix[len - 1] != ' ')
2440 colon = ": ";
2441 mutex_lock(hdl->lock);
2442 list_for_each_entry(ctrl, &hdl->ctrls, node)
2443 if (!(ctrl->flags & V4L2_CTRL_FLAG_DISABLED))
2444 log_ctrl(ctrl, prefix, colon);
2445 mutex_unlock(hdl->lock);
2446 }
2447 EXPORT_SYMBOL(v4l2_ctrl_handler_log_status);
2448
2449 int v4l2_ctrl_subdev_log_status(struct v4l2_subdev *sd)
2450 {
2451 v4l2_ctrl_handler_log_status(sd->ctrl_handler, sd->name);
2452 return 0;
2453 }
2454 EXPORT_SYMBOL(v4l2_ctrl_subdev_log_status);
2455
2456 /* Call s_ctrl for all controls owned by the handler */
2457 int __v4l2_ctrl_handler_setup(struct v4l2_ctrl_handler *hdl)
2458 {
2459 struct v4l2_ctrl *ctrl;
2460 int ret = 0;
2461
2462 if (hdl == NULL)
2463 return 0;
2464
2465 lockdep_assert_held(hdl->lock);
2466
2467 list_for_each_entry(ctrl, &hdl->ctrls, node)
2468 ctrl->done = false;
2469
2470 list_for_each_entry(ctrl, &hdl->ctrls, node) {
2471 struct v4l2_ctrl *master = ctrl->cluster[0];
2472 int i;
2473
2474 /* Skip if this control was already handled by a cluster. */
2475 /* Skip button controls and read-only controls. */
2476 if (ctrl->done || ctrl->type == V4L2_CTRL_TYPE_BUTTON ||
2477 (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY))
2478 continue;
2479
2480 for (i = 0; i < master->ncontrols; i++) {
2481 if (master->cluster[i]) {
2482 cur_to_new(master->cluster[i]);
2483 master->cluster[i]->is_new = 1;
2484 master->cluster[i]->done = true;
2485 }
2486 }
2487 ret = call_op(master, s_ctrl);
2488 if (ret)
2489 break;
2490 }
2491
2492 return ret;
2493 }
2494 EXPORT_SYMBOL_GPL(__v4l2_ctrl_handler_setup);
2495
2496 int v4l2_ctrl_handler_setup(struct v4l2_ctrl_handler *hdl)
2497 {
2498 int ret;
2499
2500 if (hdl == NULL)
2501 return 0;
2502
2503 mutex_lock(hdl->lock);
2504 ret = __v4l2_ctrl_handler_setup(hdl);
2505 mutex_unlock(hdl->lock);
2506
2507 return ret;
2508 }
2509 EXPORT_SYMBOL(v4l2_ctrl_handler_setup);
2510
2511 /* Implement VIDIOC_QUERY_EXT_CTRL */
2512 int v4l2_query_ext_ctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_query_ext_ctrl *qc)
2513 {
2514 const unsigned next_flags = V4L2_CTRL_FLAG_NEXT_CTRL | V4L2_CTRL_FLAG_NEXT_COMPOUND;
2515 u32 id = qc->id & V4L2_CTRL_ID_MASK;
2516 struct v4l2_ctrl_ref *ref;
2517 struct v4l2_ctrl *ctrl;
2518
2519 if (hdl == NULL)
2520 return -EINVAL;
2521
2522 mutex_lock(hdl->lock);
2523
2524 /* Try to find it */
2525 ref = find_ref(hdl, id);
2526
2527 if ((qc->id & next_flags) && !list_empty(&hdl->ctrl_refs)) {
2528 bool is_compound;
2529 /* Match any control that is not hidden */
2530 unsigned mask = 1;
2531 bool match = false;
2532
2533 if ((qc->id & next_flags) == V4L2_CTRL_FLAG_NEXT_COMPOUND) {
2534 /* Match any hidden control */
2535 match = true;
2536 } else if ((qc->id & next_flags) == next_flags) {
2537 /* Match any control, compound or not */
2538 mask = 0;
2539 }
2540
2541 /* Find the next control with ID > qc->id */
2542
2543 /* Did we reach the end of the control list? */
2544 if (id >= node2id(hdl->ctrl_refs.prev)) {
2545 ref = NULL; /* Yes, so there is no next control */
2546 } else if (ref) {
2547 /* We found a control with the given ID, so just get
2548 the next valid one in the list. */
2549 list_for_each_entry_continue(ref, &hdl->ctrl_refs, node) {
2550 is_compound = ref->ctrl->is_array ||
2551 ref->ctrl->type >= V4L2_CTRL_COMPOUND_TYPES;
2552 if (id < ref->ctrl->id &&
2553 (is_compound & mask) == match)
2554 break;
2555 }
2556 if (&ref->node == &hdl->ctrl_refs)
2557 ref = NULL;
2558 } else {
2559 /* No control with the given ID exists, so start
2560 searching for the next largest ID. We know there
2561 is one, otherwise the first 'if' above would have
2562 been true. */
2563 list_for_each_entry(ref, &hdl->ctrl_refs, node) {
2564 is_compound = ref->ctrl->is_array ||
2565 ref->ctrl->type >= V4L2_CTRL_COMPOUND_TYPES;
2566 if (id < ref->ctrl->id &&
2567 (is_compound & mask) == match)
2568 break;
2569 }
2570 if (&ref->node == &hdl->ctrl_refs)
2571 ref = NULL;
2572 }
2573 }
2574 mutex_unlock(hdl->lock);
2575
2576 if (!ref)
2577 return -EINVAL;
2578
2579 ctrl = ref->ctrl;
2580 memset(qc, 0, sizeof(*qc));
2581 if (id >= V4L2_CID_PRIVATE_BASE)
2582 qc->id = id;
2583 else
2584 qc->id = ctrl->id;
2585 strlcpy(qc->name, ctrl->name, sizeof(qc->name));
2586 qc->flags = user_flags(ctrl);
2587 qc->type = ctrl->type;
2588 qc->elem_size = ctrl->elem_size;
2589 qc->elems = ctrl->elems;
2590 qc->nr_of_dims = ctrl->nr_of_dims;
2591 memcpy(qc->dims, ctrl->dims, qc->nr_of_dims * sizeof(qc->dims[0]));
2592 qc->minimum = ctrl->minimum;
2593 qc->maximum = ctrl->maximum;
2594 qc->default_value = ctrl->default_value;
2595 if (ctrl->type == V4L2_CTRL_TYPE_MENU
2596 || ctrl->type == V4L2_CTRL_TYPE_INTEGER_MENU)
2597 qc->step = 1;
2598 else
2599 qc->step = ctrl->step;
2600 return 0;
2601 }
2602 EXPORT_SYMBOL(v4l2_query_ext_ctrl);
2603
2604 /* Implement VIDIOC_QUERYCTRL */
2605 int v4l2_queryctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_queryctrl *qc)
2606 {
2607 struct v4l2_query_ext_ctrl qec = { qc->id };
2608 int rc;
2609
2610 rc = v4l2_query_ext_ctrl(hdl, &qec);
2611 if (rc)
2612 return rc;
2613
2614 qc->id = qec.id;
2615 qc->type = qec.type;
2616 qc->flags = qec.flags;
2617 strlcpy(qc->name, qec.name, sizeof(qc->name));
2618 switch (qc->type) {
2619 case V4L2_CTRL_TYPE_INTEGER:
2620 case V4L2_CTRL_TYPE_BOOLEAN:
2621 case V4L2_CTRL_TYPE_MENU:
2622 case V4L2_CTRL_TYPE_INTEGER_MENU:
2623 case V4L2_CTRL_TYPE_STRING:
2624 case V4L2_CTRL_TYPE_BITMASK:
2625 qc->minimum = qec.minimum;
2626 qc->maximum = qec.maximum;
2627 qc->step = qec.step;
2628 qc->default_value = qec.default_value;
2629 break;
2630 default:
2631 qc->minimum = 0;
2632 qc->maximum = 0;
2633 qc->step = 0;
2634 qc->default_value = 0;
2635 break;
2636 }
2637 return 0;
2638 }
2639 EXPORT_SYMBOL(v4l2_queryctrl);
2640
2641 /* Implement VIDIOC_QUERYMENU */
2642 int v4l2_querymenu(struct v4l2_ctrl_handler *hdl, struct v4l2_querymenu *qm)
2643 {
2644 struct v4l2_ctrl *ctrl;
2645 u32 i = qm->index;
2646
2647 ctrl = v4l2_ctrl_find(hdl, qm->id);
2648 if (!ctrl)
2649 return -EINVAL;
2650
2651 qm->reserved = 0;
2652 /* Sanity checks */
2653 switch (ctrl->type) {
2654 case V4L2_CTRL_TYPE_MENU:
2655 if (ctrl->qmenu == NULL)
2656 return -EINVAL;
2657 break;
2658 case V4L2_CTRL_TYPE_INTEGER_MENU:
2659 if (ctrl->qmenu_int == NULL)
2660 return -EINVAL;
2661 break;
2662 default:
2663 return -EINVAL;
2664 }
2665
2666 if (i < ctrl->minimum || i > ctrl->maximum)
2667 return -EINVAL;
2668
2669 /* Use mask to see if this menu item should be skipped */
2670 if (ctrl->menu_skip_mask & (1 << i))
2671 return -EINVAL;
2672 /* Empty menu items should also be skipped */
2673 if (ctrl->type == V4L2_CTRL_TYPE_MENU) {
2674 if (ctrl->qmenu[i] == NULL || ctrl->qmenu[i][0] == '\0')
2675 return -EINVAL;
2676 strlcpy(qm->name, ctrl->qmenu[i], sizeof(qm->name));
2677 } else {
2678 qm->value = ctrl->qmenu_int[i];
2679 }
2680 return 0;
2681 }
2682 EXPORT_SYMBOL(v4l2_querymenu);
2683
2684
2685 /* Some general notes on the atomic requirements of VIDIOC_G/TRY/S_EXT_CTRLS:
2686
2687 It is not a fully atomic operation, just best-effort only. After all, if
2688 multiple controls have to be set through multiple i2c writes (for example)
2689 then some initial writes may succeed while others fail. Thus leaving the
2690 system in an inconsistent state. The question is how much effort you are
2691 willing to spend on trying to make something atomic that really isn't.
2692
2693 From the point of view of an application the main requirement is that
2694 when you call VIDIOC_S_EXT_CTRLS and some values are invalid then an
2695 error should be returned without actually affecting any controls.
2696
2697 If all the values are correct, then it is acceptable to just give up
2698 in case of low-level errors.
2699
2700 It is important though that the application can tell when only a partial
2701 configuration was done. The way we do that is through the error_idx field
2702 of struct v4l2_ext_controls: if that is equal to the count field then no
2703 controls were affected. Otherwise all controls before that index were
2704 successful in performing their 'get' or 'set' operation, the control at
2705 the given index failed, and you don't know what happened with the controls
2706 after the failed one. Since if they were part of a control cluster they
2707 could have been successfully processed (if a cluster member was encountered
2708 at index < error_idx), they could have failed (if a cluster member was at
2709 error_idx), or they may not have been processed yet (if the first cluster
2710 member appeared after error_idx).
2711
2712 It is all fairly theoretical, though. In practice all you can do is to
2713 bail out. If error_idx == count, then it is an application bug. If
2714 error_idx < count then it is only an application bug if the error code was
2715 EBUSY. That usually means that something started streaming just when you
2716 tried to set the controls. In all other cases it is a driver/hardware
2717 problem and all you can do is to retry or bail out.
2718
2719 Note that these rules do not apply to VIDIOC_TRY_EXT_CTRLS: since that
2720 never modifies controls the error_idx is just set to whatever control
2721 has an invalid value.
2722 */
2723
2724 /* Prepare for the extended g/s/try functions.
2725 Find the controls in the control array and do some basic checks. */
2726 static int prepare_ext_ctrls(struct v4l2_ctrl_handler *hdl,
2727 struct v4l2_ext_controls *cs,
2728 struct v4l2_ctrl_helper *helpers,
2729 bool get)
2730 {
2731 struct v4l2_ctrl_helper *h;
2732 bool have_clusters = false;
2733 u32 i;
2734
2735 for (i = 0, h = helpers; i < cs->count; i++, h++) {
2736 struct v4l2_ext_control *c = &cs->controls[i];
2737 struct v4l2_ctrl_ref *ref;
2738 struct v4l2_ctrl *ctrl;
2739 u32 id = c->id & V4L2_CTRL_ID_MASK;
2740
2741 cs->error_idx = i;
2742
2743 if (cs->which &&
2744 cs->which != V4L2_CTRL_WHICH_DEF_VAL &&
2745 V4L2_CTRL_ID2WHICH(id) != cs->which)
2746 return -EINVAL;
2747
2748 /* Old-style private controls are not allowed for
2749 extended controls */
2750 if (id >= V4L2_CID_PRIVATE_BASE)
2751 return -EINVAL;
2752 ref = find_ref_lock(hdl, id);
2753 if (ref == NULL)
2754 return -EINVAL;
2755 ctrl = ref->ctrl;
2756 if (ctrl->flags & V4L2_CTRL_FLAG_DISABLED)
2757 return -EINVAL;
2758
2759 if (ctrl->cluster[0]->ncontrols > 1)
2760 have_clusters = true;
2761 if (ctrl->cluster[0] != ctrl)
2762 ref = find_ref_lock(hdl, ctrl->cluster[0]->id);
2763 if (ctrl->is_ptr && !ctrl->is_string) {
2764 unsigned tot_size = ctrl->elems * ctrl->elem_size;
2765
2766 if (c->size < tot_size) {
2767 if (get) {
2768 c->size = tot_size;
2769 return -ENOSPC;
2770 }
2771 return -EFAULT;
2772 }
2773 c->size = tot_size;
2774 }
2775 /* Store the ref to the master control of the cluster */
2776 h->mref = ref;
2777 h->ctrl = ctrl;
2778 /* Initially set next to 0, meaning that there is no other
2779 control in this helper array belonging to the same
2780 cluster */
2781 h->next = 0;
2782 }
2783
2784 /* We are done if there were no controls that belong to a multi-
2785 control cluster. */
2786 if (!have_clusters)
2787 return 0;
2788
2789 /* The code below figures out in O(n) time which controls in the list
2790 belong to the same cluster. */
2791
2792 /* This has to be done with the handler lock taken. */
2793 mutex_lock(hdl->lock);
2794
2795 /* First zero the helper field in the master control references */
2796 for (i = 0; i < cs->count; i++)
2797 helpers[i].mref->helper = NULL;
2798 for (i = 0, h = helpers; i < cs->count; i++, h++) {
2799 struct v4l2_ctrl_ref *mref = h->mref;
2800
2801 /* If the mref->helper is set, then it points to an earlier
2802 helper that belongs to the same cluster. */
2803 if (mref->helper) {
2804 /* Set the next field of mref->helper to the current
2805 index: this means that that earlier helper now
2806 points to the next helper in the same cluster. */
2807 mref->helper->next = i;
2808 /* mref should be set only for the first helper in the
2809 cluster, clear the others. */
2810 h->mref = NULL;
2811 }
2812 /* Point the mref helper to the current helper struct. */
2813 mref->helper = h;
2814 }
2815 mutex_unlock(hdl->lock);
2816 return 0;
2817 }
2818
2819 /* Handles the corner case where cs->count == 0. It checks whether the
2820 specified control class exists. If that class ID is 0, then it checks
2821 whether there are any controls at all. */
2822 static int class_check(struct v4l2_ctrl_handler *hdl, u32 which)
2823 {
2824 if (which == 0 || which == V4L2_CTRL_WHICH_DEF_VAL)
2825 return 0;
2826 return find_ref_lock(hdl, which | 1) ? 0 : -EINVAL;
2827 }
2828
2829
2830
2831 /* Get extended controls. Allocates the helpers array if needed. */
2832 int v4l2_g_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *cs)
2833 {
2834 struct v4l2_ctrl_helper helper[4];
2835 struct v4l2_ctrl_helper *helpers = helper;
2836 int ret;
2837 int i, j;
2838 bool def_value;
2839
2840 def_value = (cs->which == V4L2_CTRL_WHICH_DEF_VAL);
2841
2842 cs->error_idx = cs->count;
2843 cs->which = V4L2_CTRL_ID2WHICH(cs->which);
2844
2845 if (hdl == NULL)
2846 return -EINVAL;
2847
2848 if (cs->count == 0)
2849 return class_check(hdl, cs->which);
2850
2851 if (cs->count > ARRAY_SIZE(helper)) {
2852 helpers = kvmalloc_array(cs->count, sizeof(helper[0]),
2853 GFP_KERNEL);
2854 if (helpers == NULL)
2855 return -ENOMEM;
2856 }
2857
2858 ret = prepare_ext_ctrls(hdl, cs, helpers, true);
2859 cs->error_idx = cs->count;
2860
2861 for (i = 0; !ret && i < cs->count; i++)
2862 if (helpers[i].ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY)
2863 ret = -EACCES;
2864
2865 for (i = 0; !ret && i < cs->count; i++) {
2866 int (*ctrl_to_user)(struct v4l2_ext_control *c,
2867 struct v4l2_ctrl *ctrl);
2868 struct v4l2_ctrl *master;
2869
2870 ctrl_to_user = def_value ? def_to_user : cur_to_user;
2871
2872 if (helpers[i].mref == NULL)
2873 continue;
2874
2875 master = helpers[i].mref->ctrl;
2876 cs->error_idx = i;
2877
2878 v4l2_ctrl_lock(master);
2879
2880 /* g_volatile_ctrl will update the new control values */
2881 if (!def_value &&
2882 ((master->flags & V4L2_CTRL_FLAG_VOLATILE) ||
2883 (master->has_volatiles && !is_cur_manual(master)))) {
2884 for (j = 0; j < master->ncontrols; j++)
2885 cur_to_new(master->cluster[j]);
2886 ret = call_op(master, g_volatile_ctrl);
2887 ctrl_to_user = new_to_user;
2888 }
2889 /* If OK, then copy the current (for non-volatile controls)
2890 or the new (for volatile controls) control values to the
2891 caller */
2892 if (!ret) {
2893 u32 idx = i;
2894
2895 do {
2896 ret = ctrl_to_user(cs->controls + idx,
2897 helpers[idx].ctrl);
2898 idx = helpers[idx].next;
2899 } while (!ret && idx);
2900 }
2901 v4l2_ctrl_unlock(master);
2902 }
2903
2904 if (cs->count > ARRAY_SIZE(helper))
2905 kvfree(helpers);
2906 return ret;
2907 }
2908 EXPORT_SYMBOL(v4l2_g_ext_ctrls);
2909
2910 /* Helper function to get a single control */
2911 static int get_ctrl(struct v4l2_ctrl *ctrl, struct v4l2_ext_control *c)
2912 {
2913 struct v4l2_ctrl *master = ctrl->cluster[0];
2914 int ret = 0;
2915 int i;
2916
2917 /* Compound controls are not supported. The new_to_user() and
2918 * cur_to_user() calls below would need to be modified not to access
2919 * userspace memory when called from get_ctrl().
2920 */
2921 if (!ctrl->is_int && ctrl->type != V4L2_CTRL_TYPE_INTEGER64)
2922 return -EINVAL;
2923
2924 if (ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY)
2925 return -EACCES;
2926
2927 v4l2_ctrl_lock(master);
2928 /* g_volatile_ctrl will update the current control values */
2929 if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE) {
2930 for (i = 0; i < master->ncontrols; i++)
2931 cur_to_new(master->cluster[i]);
2932 ret = call_op(master, g_volatile_ctrl);
2933 new_to_user(c, ctrl);
2934 } else {
2935 cur_to_user(c, ctrl);
2936 }
2937 v4l2_ctrl_unlock(master);
2938 return ret;
2939 }
2940
2941 int v4l2_g_ctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_control *control)
2942 {
2943 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, control->id);
2944 struct v4l2_ext_control c;
2945 int ret;
2946
2947 if (ctrl == NULL || !ctrl->is_int)
2948 return -EINVAL;
2949 ret = get_ctrl(ctrl, &c);
2950 control->value = c.value;
2951 return ret;
2952 }
2953 EXPORT_SYMBOL(v4l2_g_ctrl);
2954
2955 s32 v4l2_ctrl_g_ctrl(struct v4l2_ctrl *ctrl)
2956 {
2957 struct v4l2_ext_control c;
2958
2959 /* It's a driver bug if this happens. */
2960 WARN_ON(!ctrl->is_int);
2961 c.value = 0;
2962 get_ctrl(ctrl, &c);
2963 return c.value;
2964 }
2965 EXPORT_SYMBOL(v4l2_ctrl_g_ctrl);
2966
2967 s64 v4l2_ctrl_g_ctrl_int64(struct v4l2_ctrl *ctrl)
2968 {
2969 struct v4l2_ext_control c;
2970
2971 /* It's a driver bug if this happens. */
2972 WARN_ON(ctrl->is_ptr || ctrl->type != V4L2_CTRL_TYPE_INTEGER64);
2973 c.value64 = 0;
2974 get_ctrl(ctrl, &c);
2975 return c.value64;
2976 }
2977 EXPORT_SYMBOL(v4l2_ctrl_g_ctrl_int64);
2978
2979
2980 /* Core function that calls try/s_ctrl and ensures that the new value is
2981 copied to the current value on a set.
2982 Must be called with ctrl->handler->lock held. */
2983 static int try_or_set_cluster(struct v4l2_fh *fh, struct v4l2_ctrl *master,
2984 bool set, u32 ch_flags)
2985 {
2986 bool update_flag;
2987 int ret;
2988 int i;
2989
2990 /* Go through the cluster and either validate the new value or
2991 (if no new value was set), copy the current value to the new
2992 value, ensuring a consistent view for the control ops when
2993 called. */
2994 for (i = 0; i < master->ncontrols; i++) {
2995 struct v4l2_ctrl *ctrl = master->cluster[i];
2996
2997 if (ctrl == NULL)
2998 continue;
2999
3000 if (!ctrl->is_new) {
3001 cur_to_new(ctrl);
3002 continue;
3003 }
3004 /* Check again: it may have changed since the
3005 previous check in try_or_set_ext_ctrls(). */
3006 if (set && (ctrl->flags & V4L2_CTRL_FLAG_GRABBED))
3007 return -EBUSY;
3008 }
3009
3010 ret = call_op(master, try_ctrl);
3011
3012 /* Don't set if there is no change */
3013 if (ret || !set || !cluster_changed(master))
3014 return ret;
3015 ret = call_op(master, s_ctrl);
3016 if (ret)
3017 return ret;
3018
3019 /* If OK, then make the new values permanent. */
3020 update_flag = is_cur_manual(master) != is_new_manual(master);
3021 for (i = 0; i < master->ncontrols; i++)
3022 new_to_cur(fh, master->cluster[i], ch_flags |
3023 ((update_flag && i > 0) ? V4L2_EVENT_CTRL_CH_FLAGS : 0));
3024 return 0;
3025 }
3026
3027 /* Validate controls. */
3028 static int validate_ctrls(struct v4l2_ext_controls *cs,
3029 struct v4l2_ctrl_helper *helpers, bool set)
3030 {
3031 unsigned i;
3032 int ret = 0;
3033
3034 cs->error_idx = cs->count;
3035 for (i = 0; i < cs->count; i++) {
3036 struct v4l2_ctrl *ctrl = helpers[i].ctrl;
3037 union v4l2_ctrl_ptr p_new;
3038
3039 cs->error_idx = i;
3040
3041 if (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY)
3042 return -EACCES;
3043 /* This test is also done in try_set_control_cluster() which
3044 is called in atomic context, so that has the final say,
3045 but it makes sense to do an up-front check as well. Once
3046 an error occurs in try_set_control_cluster() some other
3047 controls may have been set already and we want to do a
3048 best-effort to avoid that. */
3049 if (set && (ctrl->flags & V4L2_CTRL_FLAG_GRABBED))
3050 return -EBUSY;
3051 /*
3052 * Skip validation for now if the payload needs to be copied
3053 * from userspace into kernelspace. We'll validate those later.
3054 */
3055 if (ctrl->is_ptr)
3056 continue;
3057 if (ctrl->type == V4L2_CTRL_TYPE_INTEGER64)
3058 p_new.p_s64 = &cs->controls[i].value64;
3059 else
3060 p_new.p_s32 = &cs->controls[i].value;
3061 ret = validate_new(ctrl, p_new);
3062 if (ret)
3063 return ret;
3064 }
3065 return 0;
3066 }
3067
3068 /* Obtain the current volatile values of an autocluster and mark them
3069 as new. */
3070 static void update_from_auto_cluster(struct v4l2_ctrl *master)
3071 {
3072 int i;
3073
3074 for (i = 1; i < master->ncontrols; i++)
3075 cur_to_new(master->cluster[i]);
3076 if (!call_op(master, g_volatile_ctrl))
3077 for (i = 1; i < master->ncontrols; i++)
3078 if (master->cluster[i])
3079 master->cluster[i]->is_new = 1;
3080 }
3081
3082 /* Try or try-and-set controls */
3083 static int try_set_ext_ctrls(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
3084 struct v4l2_ext_controls *cs,
3085 bool set)
3086 {
3087 struct v4l2_ctrl_helper helper[4];
3088 struct v4l2_ctrl_helper *helpers = helper;
3089 unsigned i, j;
3090 int ret;
3091
3092 cs->error_idx = cs->count;
3093
3094 /* Default value cannot be changed */
3095 if (cs->which == V4L2_CTRL_WHICH_DEF_VAL)
3096 return -EINVAL;
3097
3098 cs->which = V4L2_CTRL_ID2WHICH(cs->which);
3099
3100 if (hdl == NULL)
3101 return -EINVAL;
3102
3103 if (cs->count == 0)
3104 return class_check(hdl, cs->which);
3105
3106 if (cs->count > ARRAY_SIZE(helper)) {
3107 helpers = kvmalloc_array(cs->count, sizeof(helper[0]),
3108 GFP_KERNEL);
3109 if (!helpers)
3110 return -ENOMEM;
3111 }
3112 ret = prepare_ext_ctrls(hdl, cs, helpers, false);
3113 if (!ret)
3114 ret = validate_ctrls(cs, helpers, set);
3115 if (ret && set)
3116 cs->error_idx = cs->count;
3117 for (i = 0; !ret && i < cs->count; i++) {
3118 struct v4l2_ctrl *master;
3119 u32 idx = i;
3120
3121 if (helpers[i].mref == NULL)
3122 continue;
3123
3124 cs->error_idx = i;
3125 master = helpers[i].mref->ctrl;
3126 v4l2_ctrl_lock(master);
3127
3128 /* Reset the 'is_new' flags of the cluster */
3129 for (j = 0; j < master->ncontrols; j++)
3130 if (master->cluster[j])
3131 master->cluster[j]->is_new = 0;
3132
3133 /* For volatile autoclusters that are currently in auto mode
3134 we need to discover if it will be set to manual mode.
3135 If so, then we have to copy the current volatile values
3136 first since those will become the new manual values (which
3137 may be overwritten by explicit new values from this set
3138 of controls). */
3139 if (master->is_auto && master->has_volatiles &&
3140 !is_cur_manual(master)) {
3141 /* Pick an initial non-manual value */
3142 s32 new_auto_val = master->manual_mode_value + 1;
3143 u32 tmp_idx = idx;
3144
3145 do {
3146 /* Check if the auto control is part of the
3147 list, and remember the new value. */
3148 if (helpers[tmp_idx].ctrl == master)
3149 new_auto_val = cs->controls[tmp_idx].value;
3150 tmp_idx = helpers[tmp_idx].next;
3151 } while (tmp_idx);
3152 /* If the new value == the manual value, then copy
3153 the current volatile values. */
3154 if (new_auto_val == master->manual_mode_value)
3155 update_from_auto_cluster(master);
3156 }
3157
3158 /* Copy the new caller-supplied control values.
3159 user_to_new() sets 'is_new' to 1. */
3160 do {
3161 struct v4l2_ctrl *ctrl = helpers[idx].ctrl;
3162
3163 ret = user_to_new(cs->controls + idx, ctrl);
3164 if (!ret && ctrl->is_ptr)
3165 ret = validate_new(ctrl, ctrl->p_new);
3166 idx = helpers[idx].next;
3167 } while (!ret && idx);
3168
3169 if (!ret)
3170 ret = try_or_set_cluster(fh, master, set, 0);
3171
3172 /* Copy the new values back to userspace. */
3173 if (!ret) {
3174 idx = i;
3175 do {
3176 ret = new_to_user(cs->controls + idx,
3177 helpers[idx].ctrl);
3178 idx = helpers[idx].next;
3179 } while (!ret && idx);
3180 }
3181 v4l2_ctrl_unlock(master);
3182 }
3183
3184 if (cs->count > ARRAY_SIZE(helper))
3185 kvfree(helpers);
3186 return ret;
3187 }
3188
3189 int v4l2_try_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *cs)
3190 {
3191 return try_set_ext_ctrls(NULL, hdl, cs, false);
3192 }
3193 EXPORT_SYMBOL(v4l2_try_ext_ctrls);
3194
3195 int v4l2_s_ext_ctrls(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
3196 struct v4l2_ext_controls *cs)
3197 {
3198 return try_set_ext_ctrls(fh, hdl, cs, true);
3199 }
3200 EXPORT_SYMBOL(v4l2_s_ext_ctrls);
3201
3202 /* Helper function for VIDIOC_S_CTRL compatibility */
3203 static int set_ctrl(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, u32 ch_flags)
3204 {
3205 struct v4l2_ctrl *master = ctrl->cluster[0];
3206 int ret;
3207 int i;
3208
3209 /* Reset the 'is_new' flags of the cluster */
3210 for (i = 0; i < master->ncontrols; i++)
3211 if (master->cluster[i])
3212 master->cluster[i]->is_new = 0;
3213
3214 ret = validate_new(ctrl, ctrl->p_new);
3215 if (ret)
3216 return ret;
3217
3218 /* For autoclusters with volatiles that are switched from auto to
3219 manual mode we have to update the current volatile values since
3220 those will become the initial manual values after such a switch. */
3221 if (master->is_auto && master->has_volatiles && ctrl == master &&
3222 !is_cur_manual(master) && ctrl->val == master->manual_mode_value)
3223 update_from_auto_cluster(master);
3224
3225 ctrl->is_new = 1;
3226 return try_or_set_cluster(fh, master, true, ch_flags);
3227 }
3228
3229 /* Helper function for VIDIOC_S_CTRL compatibility */
3230 static int set_ctrl_lock(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl,
3231 struct v4l2_ext_control *c)
3232 {
3233 int ret;
3234
3235 v4l2_ctrl_lock(ctrl);
3236 user_to_new(c, ctrl);
3237 ret = set_ctrl(fh, ctrl, 0);
3238 if (!ret)
3239 cur_to_user(c, ctrl);
3240 v4l2_ctrl_unlock(ctrl);
3241 return ret;
3242 }
3243
3244 int v4l2_s_ctrl(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
3245 struct v4l2_control *control)
3246 {
3247 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, control->id);
3248 struct v4l2_ext_control c = { control->id };
3249 int ret;
3250
3251 if (ctrl == NULL || !ctrl->is_int)
3252 return -EINVAL;
3253
3254 if (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY)
3255 return -EACCES;
3256
3257 c.value = control->value;
3258 ret = set_ctrl_lock(fh, ctrl, &c);
3259 control->value = c.value;
3260 return ret;
3261 }
3262 EXPORT_SYMBOL(v4l2_s_ctrl);
3263
3264 int __v4l2_ctrl_s_ctrl(struct v4l2_ctrl *ctrl, s32 val)
3265 {
3266 lockdep_assert_held(ctrl->handler->lock);
3267
3268 /* It's a driver bug if this happens. */
3269 WARN_ON(!ctrl->is_int);
3270 ctrl->val = val;
3271 return set_ctrl(NULL, ctrl, 0);
3272 }
3273 EXPORT_SYMBOL(__v4l2_ctrl_s_ctrl);
3274
3275 int __v4l2_ctrl_s_ctrl_int64(struct v4l2_ctrl *ctrl, s64 val)
3276 {
3277 lockdep_assert_held(ctrl->handler->lock);
3278
3279 /* It's a driver bug if this happens. */
3280 WARN_ON(ctrl->is_ptr || ctrl->type != V4L2_CTRL_TYPE_INTEGER64);
3281 *ctrl->p_new.p_s64 = val;
3282 return set_ctrl(NULL, ctrl, 0);
3283 }
3284 EXPORT_SYMBOL(__v4l2_ctrl_s_ctrl_int64);
3285
3286 int __v4l2_ctrl_s_ctrl_string(struct v4l2_ctrl *ctrl, const char *s)
3287 {
3288 lockdep_assert_held(ctrl->handler->lock);
3289
3290 /* It's a driver bug if this happens. */
3291 WARN_ON(ctrl->type != V4L2_CTRL_TYPE_STRING);
3292 strlcpy(ctrl->p_new.p_char, s, ctrl->maximum + 1);
3293 return set_ctrl(NULL, ctrl, 0);
3294 }
3295 EXPORT_SYMBOL(__v4l2_ctrl_s_ctrl_string);
3296
3297 void v4l2_ctrl_notify(struct v4l2_ctrl *ctrl, v4l2_ctrl_notify_fnc notify, void *priv)
3298 {
3299 if (ctrl == NULL)
3300 return;
3301 if (notify == NULL) {
3302 ctrl->call_notify = 0;
3303 return;
3304 }
3305 if (WARN_ON(ctrl->handler->notify && ctrl->handler->notify != notify))
3306 return;
3307 ctrl->handler->notify = notify;
3308 ctrl->handler->notify_priv = priv;
3309 ctrl->call_notify = 1;
3310 }
3311 EXPORT_SYMBOL(v4l2_ctrl_notify);
3312
3313 int __v4l2_ctrl_modify_range(struct v4l2_ctrl *ctrl,
3314 s64 min, s64 max, u64 step, s64 def)
3315 {
3316 bool value_changed;
3317 bool range_changed = false;
3318 int ret;
3319
3320 lockdep_assert_held(ctrl->handler->lock);
3321
3322 switch (ctrl->type) {
3323 case V4L2_CTRL_TYPE_INTEGER:
3324 case V4L2_CTRL_TYPE_INTEGER64:
3325 case V4L2_CTRL_TYPE_BOOLEAN:
3326 case V4L2_CTRL_TYPE_MENU:
3327 case V4L2_CTRL_TYPE_INTEGER_MENU:
3328 case V4L2_CTRL_TYPE_BITMASK:
3329 case V4L2_CTRL_TYPE_U8:
3330 case V4L2_CTRL_TYPE_U16:
3331 case V4L2_CTRL_TYPE_U32:
3332 if (ctrl->is_array)
3333 return -EINVAL;
3334 ret = check_range(ctrl->type, min, max, step, def);
3335 if (ret)
3336 return ret;
3337 break;
3338 default:
3339 return -EINVAL;
3340 }
3341 if ((ctrl->minimum != min) || (ctrl->maximum != max) ||
3342 (ctrl->step != step) || ctrl->default_value != def) {
3343 range_changed = true;
3344 ctrl->minimum = min;
3345 ctrl->maximum = max;
3346 ctrl->step = step;
3347 ctrl->default_value = def;
3348 }
3349 cur_to_new(ctrl);
3350 if (validate_new(ctrl, ctrl->p_new)) {
3351 if (ctrl->type == V4L2_CTRL_TYPE_INTEGER64)
3352 *ctrl->p_new.p_s64 = def;
3353 else
3354 *ctrl->p_new.p_s32 = def;
3355 }
3356
3357 if (ctrl->type == V4L2_CTRL_TYPE_INTEGER64)
3358 value_changed = *ctrl->p_new.p_s64 != *ctrl->p_cur.p_s64;
3359 else
3360 value_changed = *ctrl->p_new.p_s32 != *ctrl->p_cur.p_s32;
3361 if (value_changed)
3362 ret = set_ctrl(NULL, ctrl, V4L2_EVENT_CTRL_CH_RANGE);
3363 else if (range_changed)
3364 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_RANGE);
3365 return ret;
3366 }
3367 EXPORT_SYMBOL(__v4l2_ctrl_modify_range);
3368
3369 static int v4l2_ctrl_add_event(struct v4l2_subscribed_event *sev, unsigned elems)
3370 {
3371 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(sev->fh->ctrl_handler, sev->id);
3372
3373 if (ctrl == NULL)
3374 return -EINVAL;
3375
3376 v4l2_ctrl_lock(ctrl);
3377 list_add_tail(&sev->node, &ctrl->ev_subs);
3378 if (ctrl->type != V4L2_CTRL_TYPE_CTRL_CLASS &&
3379 (sev->flags & V4L2_EVENT_SUB_FL_SEND_INITIAL)) {
3380 struct v4l2_event ev;
3381 u32 changes = V4L2_EVENT_CTRL_CH_FLAGS;
3382
3383 if (!(ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY))
3384 changes |= V4L2_EVENT_CTRL_CH_VALUE;
3385 fill_event(&ev, ctrl, changes);
3386 /* Mark the queue as active, allowing this initial
3387 event to be accepted. */
3388 sev->elems = elems;
3389 v4l2_event_queue_fh(sev->fh, &ev);
3390 }
3391 v4l2_ctrl_unlock(ctrl);
3392 return 0;
3393 }
3394
3395 static void v4l2_ctrl_del_event(struct v4l2_subscribed_event *sev)
3396 {
3397 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(sev->fh->ctrl_handler, sev->id);
3398
3399 if (ctrl == NULL)
3400 return;
3401
3402 v4l2_ctrl_lock(ctrl);
3403 list_del(&sev->node);
3404 v4l2_ctrl_unlock(ctrl);
3405 }
3406
3407 void v4l2_ctrl_replace(struct v4l2_event *old, const struct v4l2_event *new)
3408 {
3409 u32 old_changes = old->u.ctrl.changes;
3410
3411 old->u.ctrl = new->u.ctrl;
3412 old->u.ctrl.changes |= old_changes;
3413 }
3414 EXPORT_SYMBOL(v4l2_ctrl_replace);
3415
3416 void v4l2_ctrl_merge(const struct v4l2_event *old, struct v4l2_event *new)
3417 {
3418 new->u.ctrl.changes |= old->u.ctrl.changes;
3419 }
3420 EXPORT_SYMBOL(v4l2_ctrl_merge);
3421
3422 const struct v4l2_subscribed_event_ops v4l2_ctrl_sub_ev_ops = {
3423 .add = v4l2_ctrl_add_event,
3424 .del = v4l2_ctrl_del_event,
3425 .replace = v4l2_ctrl_replace,
3426 .merge = v4l2_ctrl_merge,
3427 };
3428 EXPORT_SYMBOL(v4l2_ctrl_sub_ev_ops);
3429
3430 int v4l2_ctrl_log_status(struct file *file, void *fh)
3431 {
3432 struct video_device *vfd = video_devdata(file);
3433 struct v4l2_fh *vfh = file->private_data;
3434
3435 if (test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags) && vfd->v4l2_dev)
3436 v4l2_ctrl_handler_log_status(vfh->ctrl_handler,
3437 vfd->v4l2_dev->name);
3438 return 0;
3439 }
3440 EXPORT_SYMBOL(v4l2_ctrl_log_status);
3441
3442 int v4l2_ctrl_subscribe_event(struct v4l2_fh *fh,
3443 const struct v4l2_event_subscription *sub)
3444 {
3445 if (sub->type == V4L2_EVENT_CTRL)
3446 return v4l2_event_subscribe(fh, sub, 0, &v4l2_ctrl_sub_ev_ops);
3447 return -EINVAL;
3448 }
3449 EXPORT_SYMBOL(v4l2_ctrl_subscribe_event);
3450
3451 int v4l2_ctrl_subdev_subscribe_event(struct v4l2_subdev *sd, struct v4l2_fh *fh,
3452 struct v4l2_event_subscription *sub)
3453 {
3454 if (!sd->ctrl_handler)
3455 return -EINVAL;
3456 return v4l2_ctrl_subscribe_event(fh, sub);
3457 }
3458 EXPORT_SYMBOL(v4l2_ctrl_subdev_subscribe_event);
3459
3460 unsigned int v4l2_ctrl_poll(struct file *file, struct poll_table_struct *wait)
3461 {
3462 struct v4l2_fh *fh = file->private_data;
3463
3464 if (v4l2_event_pending(fh))
3465 return POLLPRI;
3466 poll_wait(file, &fh->wait, wait);
3467 return 0;
3468 }
3469 EXPORT_SYMBOL(v4l2_ctrl_poll);
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