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[media] cec-gpio: don't generate spurious HPD events
[mirror_ubuntu-focal-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 *type = V4L2_CTRL_TYPE_BUTTON;
1018 *flags |= V4L2_CTRL_FLAG_WRITE_ONLY |
1019 V4L2_CTRL_FLAG_EXECUTE_ON_WRITE;
1020 *min = *max = *step = *def = 0;
1021 break;
1022 case V4L2_CID_POWER_LINE_FREQUENCY:
1023 case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ:
1024 case V4L2_CID_MPEG_AUDIO_ENCODING:
1025 case V4L2_CID_MPEG_AUDIO_L1_BITRATE:
1026 case V4L2_CID_MPEG_AUDIO_L2_BITRATE:
1027 case V4L2_CID_MPEG_AUDIO_L3_BITRATE:
1028 case V4L2_CID_MPEG_AUDIO_AC3_BITRATE:
1029 case V4L2_CID_MPEG_AUDIO_MODE:
1030 case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION:
1031 case V4L2_CID_MPEG_AUDIO_EMPHASIS:
1032 case V4L2_CID_MPEG_AUDIO_CRC:
1033 case V4L2_CID_MPEG_AUDIO_DEC_PLAYBACK:
1034 case V4L2_CID_MPEG_AUDIO_DEC_MULTILINGUAL_PLAYBACK:
1035 case V4L2_CID_MPEG_VIDEO_ENCODING:
1036 case V4L2_CID_MPEG_VIDEO_ASPECT:
1037 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
1038 case V4L2_CID_MPEG_STREAM_TYPE:
1039 case V4L2_CID_MPEG_STREAM_VBI_FMT:
1040 case V4L2_CID_EXPOSURE_AUTO:
1041 case V4L2_CID_AUTO_FOCUS_RANGE:
1042 case V4L2_CID_COLORFX:
1043 case V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE:
1044 case V4L2_CID_TUNE_PREEMPHASIS:
1045 case V4L2_CID_FLASH_LED_MODE:
1046 case V4L2_CID_FLASH_STROBE_SOURCE:
1047 case V4L2_CID_MPEG_VIDEO_HEADER_MODE:
1048 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE:
1049 case V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE:
1050 case V4L2_CID_MPEG_VIDEO_H264_LEVEL:
1051 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE:
1052 case V4L2_CID_MPEG_VIDEO_H264_PROFILE:
1053 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC:
1054 case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE:
1055 case V4L2_CID_MPEG_VIDEO_H264_FMO_MAP_TYPE:
1056 case V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL:
1057 case V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE:
1058 case V4L2_CID_JPEG_CHROMA_SUBSAMPLING:
1059 case V4L2_CID_ISO_SENSITIVITY_AUTO:
1060 case V4L2_CID_EXPOSURE_METERING:
1061 case V4L2_CID_SCENE_MODE:
1062 case V4L2_CID_DV_TX_MODE:
1063 case V4L2_CID_DV_TX_RGB_RANGE:
1064 case V4L2_CID_DV_TX_IT_CONTENT_TYPE:
1065 case V4L2_CID_DV_RX_RGB_RANGE:
1066 case V4L2_CID_DV_RX_IT_CONTENT_TYPE:
1067 case V4L2_CID_TEST_PATTERN:
1068 case V4L2_CID_DEINTERLACING_MODE:
1069 case V4L2_CID_TUNE_DEEMPHASIS:
1070 case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_SEL:
1071 case V4L2_CID_DETECT_MD_MODE:
1072 *type = V4L2_CTRL_TYPE_MENU;
1073 break;
1074 case V4L2_CID_LINK_FREQ:
1075 *type = V4L2_CTRL_TYPE_INTEGER_MENU;
1076 break;
1077 case V4L2_CID_RDS_TX_PS_NAME:
1078 case V4L2_CID_RDS_TX_RADIO_TEXT:
1079 case V4L2_CID_RDS_RX_PS_NAME:
1080 case V4L2_CID_RDS_RX_RADIO_TEXT:
1081 *type = V4L2_CTRL_TYPE_STRING;
1082 break;
1083 case V4L2_CID_ISO_SENSITIVITY:
1084 case V4L2_CID_AUTO_EXPOSURE_BIAS:
1085 case V4L2_CID_MPEG_VIDEO_VPX_NUM_PARTITIONS:
1086 case V4L2_CID_MPEG_VIDEO_VPX_NUM_REF_FRAMES:
1087 *type = V4L2_CTRL_TYPE_INTEGER_MENU;
1088 break;
1089 case V4L2_CID_USER_CLASS:
1090 case V4L2_CID_CAMERA_CLASS:
1091 case V4L2_CID_MPEG_CLASS:
1092 case V4L2_CID_FM_TX_CLASS:
1093 case V4L2_CID_FLASH_CLASS:
1094 case V4L2_CID_JPEG_CLASS:
1095 case V4L2_CID_IMAGE_SOURCE_CLASS:
1096 case V4L2_CID_IMAGE_PROC_CLASS:
1097 case V4L2_CID_DV_CLASS:
1098 case V4L2_CID_FM_RX_CLASS:
1099 case V4L2_CID_RF_TUNER_CLASS:
1100 case V4L2_CID_DETECT_CLASS:
1101 *type = V4L2_CTRL_TYPE_CTRL_CLASS;
1102 /* You can neither read not write these */
1103 *flags |= V4L2_CTRL_FLAG_READ_ONLY | V4L2_CTRL_FLAG_WRITE_ONLY;
1104 *min = *max = *step = *def = 0;
1105 break;
1106 case V4L2_CID_BG_COLOR:
1107 *type = V4L2_CTRL_TYPE_INTEGER;
1108 *step = 1;
1109 *min = 0;
1110 /* Max is calculated as RGB888 that is 2^24 */
1111 *max = 0xFFFFFF;
1112 break;
1113 case V4L2_CID_FLASH_FAULT:
1114 case V4L2_CID_JPEG_ACTIVE_MARKER:
1115 case V4L2_CID_3A_LOCK:
1116 case V4L2_CID_AUTO_FOCUS_STATUS:
1117 case V4L2_CID_DV_TX_HOTPLUG:
1118 case V4L2_CID_DV_TX_RXSENSE:
1119 case V4L2_CID_DV_TX_EDID_PRESENT:
1120 case V4L2_CID_DV_RX_POWER_PRESENT:
1121 *type = V4L2_CTRL_TYPE_BITMASK;
1122 break;
1123 case V4L2_CID_MIN_BUFFERS_FOR_CAPTURE:
1124 case V4L2_CID_MIN_BUFFERS_FOR_OUTPUT:
1125 *type = V4L2_CTRL_TYPE_INTEGER;
1126 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
1127 break;
1128 case V4L2_CID_MPEG_VIDEO_DEC_PTS:
1129 *type = V4L2_CTRL_TYPE_INTEGER64;
1130 *flags |= V4L2_CTRL_FLAG_VOLATILE | V4L2_CTRL_FLAG_READ_ONLY;
1131 *min = *def = 0;
1132 *max = 0x1ffffffffLL;
1133 *step = 1;
1134 break;
1135 case V4L2_CID_MPEG_VIDEO_DEC_FRAME:
1136 *type = V4L2_CTRL_TYPE_INTEGER64;
1137 *flags |= V4L2_CTRL_FLAG_VOLATILE | V4L2_CTRL_FLAG_READ_ONLY;
1138 *min = *def = 0;
1139 *max = 0x7fffffffffffffffLL;
1140 *step = 1;
1141 break;
1142 case V4L2_CID_PIXEL_RATE:
1143 *type = V4L2_CTRL_TYPE_INTEGER64;
1144 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
1145 break;
1146 case V4L2_CID_DETECT_MD_REGION_GRID:
1147 *type = V4L2_CTRL_TYPE_U8;
1148 break;
1149 case V4L2_CID_DETECT_MD_THRESHOLD_GRID:
1150 *type = V4L2_CTRL_TYPE_U16;
1151 break;
1152 case V4L2_CID_RDS_TX_ALT_FREQS:
1153 *type = V4L2_CTRL_TYPE_U32;
1154 break;
1155 default:
1156 *type = V4L2_CTRL_TYPE_INTEGER;
1157 break;
1158 }
1159 switch (id) {
1160 case V4L2_CID_MPEG_AUDIO_ENCODING:
1161 case V4L2_CID_MPEG_AUDIO_MODE:
1162 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
1163 case V4L2_CID_MPEG_VIDEO_B_FRAMES:
1164 case V4L2_CID_MPEG_STREAM_TYPE:
1165 *flags |= V4L2_CTRL_FLAG_UPDATE;
1166 break;
1167 case V4L2_CID_AUDIO_VOLUME:
1168 case V4L2_CID_AUDIO_BALANCE:
1169 case V4L2_CID_AUDIO_BASS:
1170 case V4L2_CID_AUDIO_TREBLE:
1171 case V4L2_CID_BRIGHTNESS:
1172 case V4L2_CID_CONTRAST:
1173 case V4L2_CID_SATURATION:
1174 case V4L2_CID_HUE:
1175 case V4L2_CID_RED_BALANCE:
1176 case V4L2_CID_BLUE_BALANCE:
1177 case V4L2_CID_GAMMA:
1178 case V4L2_CID_SHARPNESS:
1179 case V4L2_CID_CHROMA_GAIN:
1180 case V4L2_CID_RDS_TX_DEVIATION:
1181 case V4L2_CID_AUDIO_LIMITER_RELEASE_TIME:
1182 case V4L2_CID_AUDIO_LIMITER_DEVIATION:
1183 case V4L2_CID_AUDIO_COMPRESSION_GAIN:
1184 case V4L2_CID_AUDIO_COMPRESSION_THRESHOLD:
1185 case V4L2_CID_AUDIO_COMPRESSION_ATTACK_TIME:
1186 case V4L2_CID_AUDIO_COMPRESSION_RELEASE_TIME:
1187 case V4L2_CID_PILOT_TONE_DEVIATION:
1188 case V4L2_CID_PILOT_TONE_FREQUENCY:
1189 case V4L2_CID_TUNE_POWER_LEVEL:
1190 case V4L2_CID_TUNE_ANTENNA_CAPACITOR:
1191 case V4L2_CID_RF_TUNER_RF_GAIN:
1192 case V4L2_CID_RF_TUNER_LNA_GAIN:
1193 case V4L2_CID_RF_TUNER_MIXER_GAIN:
1194 case V4L2_CID_RF_TUNER_IF_GAIN:
1195 case V4L2_CID_RF_TUNER_BANDWIDTH:
1196 case V4L2_CID_DETECT_MD_GLOBAL_THRESHOLD:
1197 *flags |= V4L2_CTRL_FLAG_SLIDER;
1198 break;
1199 case V4L2_CID_PAN_RELATIVE:
1200 case V4L2_CID_TILT_RELATIVE:
1201 case V4L2_CID_FOCUS_RELATIVE:
1202 case V4L2_CID_IRIS_RELATIVE:
1203 case V4L2_CID_ZOOM_RELATIVE:
1204 *flags |= V4L2_CTRL_FLAG_WRITE_ONLY |
1205 V4L2_CTRL_FLAG_EXECUTE_ON_WRITE;
1206 break;
1207 case V4L2_CID_FLASH_STROBE_STATUS:
1208 case V4L2_CID_AUTO_FOCUS_STATUS:
1209 case V4L2_CID_FLASH_READY:
1210 case V4L2_CID_DV_TX_HOTPLUG:
1211 case V4L2_CID_DV_TX_RXSENSE:
1212 case V4L2_CID_DV_TX_EDID_PRESENT:
1213 case V4L2_CID_DV_RX_POWER_PRESENT:
1214 case V4L2_CID_DV_RX_IT_CONTENT_TYPE:
1215 case V4L2_CID_RDS_RX_PTY:
1216 case V4L2_CID_RDS_RX_PS_NAME:
1217 case V4L2_CID_RDS_RX_RADIO_TEXT:
1218 case V4L2_CID_RDS_RX_TRAFFIC_ANNOUNCEMENT:
1219 case V4L2_CID_RDS_RX_TRAFFIC_PROGRAM:
1220 case V4L2_CID_RDS_RX_MUSIC_SPEECH:
1221 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
1222 break;
1223 case V4L2_CID_RF_TUNER_PLL_LOCK:
1224 *flags |= V4L2_CTRL_FLAG_VOLATILE;
1225 break;
1226 }
1227 }
1228 EXPORT_SYMBOL(v4l2_ctrl_fill);
1229
1230 static void fill_event(struct v4l2_event *ev, struct v4l2_ctrl *ctrl, u32 changes)
1231 {
1232 memset(ev->reserved, 0, sizeof(ev->reserved));
1233 ev->type = V4L2_EVENT_CTRL;
1234 ev->id = ctrl->id;
1235 ev->u.ctrl.changes = changes;
1236 ev->u.ctrl.type = ctrl->type;
1237 ev->u.ctrl.flags = ctrl->flags;
1238 if (ctrl->is_ptr)
1239 ev->u.ctrl.value64 = 0;
1240 else
1241 ev->u.ctrl.value64 = *ctrl->p_cur.p_s64;
1242 ev->u.ctrl.minimum = ctrl->minimum;
1243 ev->u.ctrl.maximum = ctrl->maximum;
1244 if (ctrl->type == V4L2_CTRL_TYPE_MENU
1245 || ctrl->type == V4L2_CTRL_TYPE_INTEGER_MENU)
1246 ev->u.ctrl.step = 1;
1247 else
1248 ev->u.ctrl.step = ctrl->step;
1249 ev->u.ctrl.default_value = ctrl->default_value;
1250 }
1251
1252 static void send_event(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, u32 changes)
1253 {
1254 struct v4l2_event ev;
1255 struct v4l2_subscribed_event *sev;
1256
1257 if (list_empty(&ctrl->ev_subs))
1258 return;
1259 fill_event(&ev, ctrl, changes);
1260
1261 list_for_each_entry(sev, &ctrl->ev_subs, node)
1262 if (sev->fh != fh ||
1263 (sev->flags & V4L2_EVENT_SUB_FL_ALLOW_FEEDBACK))
1264 v4l2_event_queue_fh(sev->fh, &ev);
1265 }
1266
1267 static bool std_equal(const struct v4l2_ctrl *ctrl, u32 idx,
1268 union v4l2_ctrl_ptr ptr1,
1269 union v4l2_ctrl_ptr ptr2)
1270 {
1271 switch (ctrl->type) {
1272 case V4L2_CTRL_TYPE_BUTTON:
1273 return false;
1274 case V4L2_CTRL_TYPE_STRING:
1275 idx *= ctrl->elem_size;
1276 /* strings are always 0-terminated */
1277 return !strcmp(ptr1.p_char + idx, ptr2.p_char + idx);
1278 case V4L2_CTRL_TYPE_INTEGER64:
1279 return ptr1.p_s64[idx] == ptr2.p_s64[idx];
1280 case V4L2_CTRL_TYPE_U8:
1281 return ptr1.p_u8[idx] == ptr2.p_u8[idx];
1282 case V4L2_CTRL_TYPE_U16:
1283 return ptr1.p_u16[idx] == ptr2.p_u16[idx];
1284 case V4L2_CTRL_TYPE_U32:
1285 return ptr1.p_u32[idx] == ptr2.p_u32[idx];
1286 default:
1287 if (ctrl->is_int)
1288 return ptr1.p_s32[idx] == ptr2.p_s32[idx];
1289 idx *= ctrl->elem_size;
1290 return !memcmp(ptr1.p + idx, ptr2.p + idx, ctrl->elem_size);
1291 }
1292 }
1293
1294 static void std_init(const struct v4l2_ctrl *ctrl, u32 idx,
1295 union v4l2_ctrl_ptr ptr)
1296 {
1297 switch (ctrl->type) {
1298 case V4L2_CTRL_TYPE_STRING:
1299 idx *= ctrl->elem_size;
1300 memset(ptr.p_char + idx, ' ', ctrl->minimum);
1301 ptr.p_char[idx + ctrl->minimum] = '\0';
1302 break;
1303 case V4L2_CTRL_TYPE_INTEGER64:
1304 ptr.p_s64[idx] = ctrl->default_value;
1305 break;
1306 case V4L2_CTRL_TYPE_INTEGER:
1307 case V4L2_CTRL_TYPE_INTEGER_MENU:
1308 case V4L2_CTRL_TYPE_MENU:
1309 case V4L2_CTRL_TYPE_BITMASK:
1310 case V4L2_CTRL_TYPE_BOOLEAN:
1311 ptr.p_s32[idx] = ctrl->default_value;
1312 break;
1313 case V4L2_CTRL_TYPE_U8:
1314 ptr.p_u8[idx] = ctrl->default_value;
1315 break;
1316 case V4L2_CTRL_TYPE_U16:
1317 ptr.p_u16[idx] = ctrl->default_value;
1318 break;
1319 case V4L2_CTRL_TYPE_U32:
1320 ptr.p_u32[idx] = ctrl->default_value;
1321 break;
1322 default:
1323 idx *= ctrl->elem_size;
1324 memset(ptr.p + idx, 0, ctrl->elem_size);
1325 break;
1326 }
1327 }
1328
1329 static void std_log(const struct v4l2_ctrl *ctrl)
1330 {
1331 union v4l2_ctrl_ptr ptr = ctrl->p_cur;
1332
1333 if (ctrl->is_array) {
1334 unsigned i;
1335
1336 for (i = 0; i < ctrl->nr_of_dims; i++)
1337 pr_cont("[%u]", ctrl->dims[i]);
1338 pr_cont(" ");
1339 }
1340
1341 switch (ctrl->type) {
1342 case V4L2_CTRL_TYPE_INTEGER:
1343 pr_cont("%d", *ptr.p_s32);
1344 break;
1345 case V4L2_CTRL_TYPE_BOOLEAN:
1346 pr_cont("%s", *ptr.p_s32 ? "true" : "false");
1347 break;
1348 case V4L2_CTRL_TYPE_MENU:
1349 pr_cont("%s", ctrl->qmenu[*ptr.p_s32]);
1350 break;
1351 case V4L2_CTRL_TYPE_INTEGER_MENU:
1352 pr_cont("%lld", ctrl->qmenu_int[*ptr.p_s32]);
1353 break;
1354 case V4L2_CTRL_TYPE_BITMASK:
1355 pr_cont("0x%08x", *ptr.p_s32);
1356 break;
1357 case V4L2_CTRL_TYPE_INTEGER64:
1358 pr_cont("%lld", *ptr.p_s64);
1359 break;
1360 case V4L2_CTRL_TYPE_STRING:
1361 pr_cont("%s", ptr.p_char);
1362 break;
1363 case V4L2_CTRL_TYPE_U8:
1364 pr_cont("%u", (unsigned)*ptr.p_u8);
1365 break;
1366 case V4L2_CTRL_TYPE_U16:
1367 pr_cont("%u", (unsigned)*ptr.p_u16);
1368 break;
1369 case V4L2_CTRL_TYPE_U32:
1370 pr_cont("%u", (unsigned)*ptr.p_u32);
1371 break;
1372 default:
1373 pr_cont("unknown type %d", ctrl->type);
1374 break;
1375 }
1376 }
1377
1378 /*
1379 * Round towards the closest legal value. Be careful when we are
1380 * close to the maximum range of the control type to prevent
1381 * wrap-arounds.
1382 */
1383 #define ROUND_TO_RANGE(val, offset_type, ctrl) \
1384 ({ \
1385 offset_type offset; \
1386 if ((ctrl)->maximum >= 0 && \
1387 val >= (ctrl)->maximum - (s32)((ctrl)->step / 2)) \
1388 val = (ctrl)->maximum; \
1389 else \
1390 val += (s32)((ctrl)->step / 2); \
1391 val = clamp_t(typeof(val), val, \
1392 (ctrl)->minimum, (ctrl)->maximum); \
1393 offset = (val) - (ctrl)->minimum; \
1394 offset = (ctrl)->step * (offset / (u32)(ctrl)->step); \
1395 val = (ctrl)->minimum + offset; \
1396 0; \
1397 })
1398
1399 /* Validate a new control */
1400 static int std_validate(const struct v4l2_ctrl *ctrl, u32 idx,
1401 union v4l2_ctrl_ptr ptr)
1402 {
1403 size_t len;
1404 u64 offset;
1405 s64 val;
1406
1407 switch (ctrl->type) {
1408 case V4L2_CTRL_TYPE_INTEGER:
1409 return ROUND_TO_RANGE(ptr.p_s32[idx], u32, ctrl);
1410 case V4L2_CTRL_TYPE_INTEGER64:
1411 /*
1412 * We can't use the ROUND_TO_RANGE define here due to
1413 * the u64 divide that needs special care.
1414 */
1415 val = ptr.p_s64[idx];
1416 if (ctrl->maximum >= 0 && val >= ctrl->maximum - (s64)(ctrl->step / 2))
1417 val = ctrl->maximum;
1418 else
1419 val += (s64)(ctrl->step / 2);
1420 val = clamp_t(s64, val, ctrl->minimum, ctrl->maximum);
1421 offset = val - ctrl->minimum;
1422 do_div(offset, ctrl->step);
1423 ptr.p_s64[idx] = ctrl->minimum + offset * ctrl->step;
1424 return 0;
1425 case V4L2_CTRL_TYPE_U8:
1426 return ROUND_TO_RANGE(ptr.p_u8[idx], u8, ctrl);
1427 case V4L2_CTRL_TYPE_U16:
1428 return ROUND_TO_RANGE(ptr.p_u16[idx], u16, ctrl);
1429 case V4L2_CTRL_TYPE_U32:
1430 return ROUND_TO_RANGE(ptr.p_u32[idx], u32, ctrl);
1431
1432 case V4L2_CTRL_TYPE_BOOLEAN:
1433 ptr.p_s32[idx] = !!ptr.p_s32[idx];
1434 return 0;
1435
1436 case V4L2_CTRL_TYPE_MENU:
1437 case V4L2_CTRL_TYPE_INTEGER_MENU:
1438 if (ptr.p_s32[idx] < ctrl->minimum || ptr.p_s32[idx] > ctrl->maximum)
1439 return -ERANGE;
1440 if (ctrl->menu_skip_mask & (1 << ptr.p_s32[idx]))
1441 return -EINVAL;
1442 if (ctrl->type == V4L2_CTRL_TYPE_MENU &&
1443 ctrl->qmenu[ptr.p_s32[idx]][0] == '\0')
1444 return -EINVAL;
1445 return 0;
1446
1447 case V4L2_CTRL_TYPE_BITMASK:
1448 ptr.p_s32[idx] &= ctrl->maximum;
1449 return 0;
1450
1451 case V4L2_CTRL_TYPE_BUTTON:
1452 case V4L2_CTRL_TYPE_CTRL_CLASS:
1453 ptr.p_s32[idx] = 0;
1454 return 0;
1455
1456 case V4L2_CTRL_TYPE_STRING:
1457 idx *= ctrl->elem_size;
1458 len = strlen(ptr.p_char + idx);
1459 if (len < ctrl->minimum)
1460 return -ERANGE;
1461 if ((len - (u32)ctrl->minimum) % (u32)ctrl->step)
1462 return -ERANGE;
1463 return 0;
1464
1465 default:
1466 return -EINVAL;
1467 }
1468 }
1469
1470 static const struct v4l2_ctrl_type_ops std_type_ops = {
1471 .equal = std_equal,
1472 .init = std_init,
1473 .log = std_log,
1474 .validate = std_validate,
1475 };
1476
1477 /* Helper function: copy the given control value back to the caller */
1478 static int ptr_to_user(struct v4l2_ext_control *c,
1479 struct v4l2_ctrl *ctrl,
1480 union v4l2_ctrl_ptr ptr)
1481 {
1482 u32 len;
1483
1484 if (ctrl->is_ptr && !ctrl->is_string)
1485 return copy_to_user(c->ptr, ptr.p, c->size) ?
1486 -EFAULT : 0;
1487
1488 switch (ctrl->type) {
1489 case V4L2_CTRL_TYPE_STRING:
1490 len = strlen(ptr.p_char);
1491 if (c->size < len + 1) {
1492 c->size = ctrl->elem_size;
1493 return -ENOSPC;
1494 }
1495 return copy_to_user(c->string, ptr.p_char, len + 1) ?
1496 -EFAULT : 0;
1497 case V4L2_CTRL_TYPE_INTEGER64:
1498 c->value64 = *ptr.p_s64;
1499 break;
1500 default:
1501 c->value = *ptr.p_s32;
1502 break;
1503 }
1504 return 0;
1505 }
1506
1507 /* Helper function: copy the current control value back to the caller */
1508 static int cur_to_user(struct v4l2_ext_control *c,
1509 struct v4l2_ctrl *ctrl)
1510 {
1511 return ptr_to_user(c, ctrl, ctrl->p_cur);
1512 }
1513
1514 /* Helper function: copy the new control value back to the caller */
1515 static int new_to_user(struct v4l2_ext_control *c,
1516 struct v4l2_ctrl *ctrl)
1517 {
1518 return ptr_to_user(c, ctrl, ctrl->p_new);
1519 }
1520
1521 /* Helper function: copy the initial control value back to the caller */
1522 static int def_to_user(struct v4l2_ext_control *c, struct v4l2_ctrl *ctrl)
1523 {
1524 int idx;
1525
1526 for (idx = 0; idx < ctrl->elems; idx++)
1527 ctrl->type_ops->init(ctrl, idx, ctrl->p_new);
1528
1529 return ptr_to_user(c, ctrl, ctrl->p_new);
1530 }
1531
1532 /* Helper function: copy the caller-provider value to the given control value */
1533 static int user_to_ptr(struct v4l2_ext_control *c,
1534 struct v4l2_ctrl *ctrl,
1535 union v4l2_ctrl_ptr ptr)
1536 {
1537 int ret;
1538 u32 size;
1539
1540 ctrl->is_new = 1;
1541 if (ctrl->is_ptr && !ctrl->is_string) {
1542 unsigned idx;
1543
1544 ret = copy_from_user(ptr.p, c->ptr, c->size) ? -EFAULT : 0;
1545 if (ret || !ctrl->is_array)
1546 return ret;
1547 for (idx = c->size / ctrl->elem_size; idx < ctrl->elems; idx++)
1548 ctrl->type_ops->init(ctrl, idx, ptr);
1549 return 0;
1550 }
1551
1552 switch (ctrl->type) {
1553 case V4L2_CTRL_TYPE_INTEGER64:
1554 *ptr.p_s64 = c->value64;
1555 break;
1556 case V4L2_CTRL_TYPE_STRING:
1557 size = c->size;
1558 if (size == 0)
1559 return -ERANGE;
1560 if (size > ctrl->maximum + 1)
1561 size = ctrl->maximum + 1;
1562 ret = copy_from_user(ptr.p_char, c->string, size) ? -EFAULT : 0;
1563 if (!ret) {
1564 char last = ptr.p_char[size - 1];
1565
1566 ptr.p_char[size - 1] = 0;
1567 /* If the string was longer than ctrl->maximum,
1568 then return an error. */
1569 if (strlen(ptr.p_char) == ctrl->maximum && last)
1570 return -ERANGE;
1571 }
1572 return ret;
1573 default:
1574 *ptr.p_s32 = c->value;
1575 break;
1576 }
1577 return 0;
1578 }
1579
1580 /* Helper function: copy the caller-provider value as the new control value */
1581 static int user_to_new(struct v4l2_ext_control *c,
1582 struct v4l2_ctrl *ctrl)
1583 {
1584 return user_to_ptr(c, ctrl, ctrl->p_new);
1585 }
1586
1587 /* Copy the one value to another. */
1588 static void ptr_to_ptr(struct v4l2_ctrl *ctrl,
1589 union v4l2_ctrl_ptr from, union v4l2_ctrl_ptr to)
1590 {
1591 if (ctrl == NULL)
1592 return;
1593 memcpy(to.p, from.p, ctrl->elems * ctrl->elem_size);
1594 }
1595
1596 /* Copy the new value to the current value. */
1597 static void new_to_cur(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, u32 ch_flags)
1598 {
1599 bool changed;
1600
1601 if (ctrl == NULL)
1602 return;
1603
1604 /* has_changed is set by cluster_changed */
1605 changed = ctrl->has_changed;
1606 if (changed)
1607 ptr_to_ptr(ctrl, ctrl->p_new, ctrl->p_cur);
1608
1609 if (ch_flags & V4L2_EVENT_CTRL_CH_FLAGS) {
1610 /* Note: CH_FLAGS is only set for auto clusters. */
1611 ctrl->flags &=
1612 ~(V4L2_CTRL_FLAG_INACTIVE | V4L2_CTRL_FLAG_VOLATILE);
1613 if (!is_cur_manual(ctrl->cluster[0])) {
1614 ctrl->flags |= V4L2_CTRL_FLAG_INACTIVE;
1615 if (ctrl->cluster[0]->has_volatiles)
1616 ctrl->flags |= V4L2_CTRL_FLAG_VOLATILE;
1617 }
1618 fh = NULL;
1619 }
1620 if (changed || ch_flags) {
1621 /* If a control was changed that was not one of the controls
1622 modified by the application, then send the event to all. */
1623 if (!ctrl->is_new)
1624 fh = NULL;
1625 send_event(fh, ctrl,
1626 (changed ? V4L2_EVENT_CTRL_CH_VALUE : 0) | ch_flags);
1627 if (ctrl->call_notify && changed && ctrl->handler->notify)
1628 ctrl->handler->notify(ctrl, ctrl->handler->notify_priv);
1629 }
1630 }
1631
1632 /* Copy the current value to the new value */
1633 static void cur_to_new(struct v4l2_ctrl *ctrl)
1634 {
1635 if (ctrl == NULL)
1636 return;
1637 ptr_to_ptr(ctrl, ctrl->p_cur, ctrl->p_new);
1638 }
1639
1640 /* Return non-zero if one or more of the controls in the cluster has a new
1641 value that differs from the current value. */
1642 static int cluster_changed(struct v4l2_ctrl *master)
1643 {
1644 bool changed = false;
1645 unsigned idx;
1646 int i;
1647
1648 for (i = 0; i < master->ncontrols; i++) {
1649 struct v4l2_ctrl *ctrl = master->cluster[i];
1650 bool ctrl_changed = false;
1651
1652 if (ctrl == NULL)
1653 continue;
1654
1655 if (ctrl->flags & V4L2_CTRL_FLAG_EXECUTE_ON_WRITE)
1656 changed = ctrl_changed = true;
1657
1658 /*
1659 * Set has_changed to false to avoid generating
1660 * the event V4L2_EVENT_CTRL_CH_VALUE
1661 */
1662 if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE) {
1663 ctrl->has_changed = false;
1664 continue;
1665 }
1666
1667 for (idx = 0; !ctrl_changed && idx < ctrl->elems; idx++)
1668 ctrl_changed = !ctrl->type_ops->equal(ctrl, idx,
1669 ctrl->p_cur, ctrl->p_new);
1670 ctrl->has_changed = ctrl_changed;
1671 changed |= ctrl->has_changed;
1672 }
1673 return changed;
1674 }
1675
1676 /* Control range checking */
1677 static int check_range(enum v4l2_ctrl_type type,
1678 s64 min, s64 max, u64 step, s64 def)
1679 {
1680 switch (type) {
1681 case V4L2_CTRL_TYPE_BOOLEAN:
1682 if (step != 1 || max > 1 || min < 0)
1683 return -ERANGE;
1684 /* fall through */
1685 case V4L2_CTRL_TYPE_U8:
1686 case V4L2_CTRL_TYPE_U16:
1687 case V4L2_CTRL_TYPE_U32:
1688 case V4L2_CTRL_TYPE_INTEGER:
1689 case V4L2_CTRL_TYPE_INTEGER64:
1690 if (step == 0 || min > max || def < min || def > max)
1691 return -ERANGE;
1692 return 0;
1693 case V4L2_CTRL_TYPE_BITMASK:
1694 if (step || min || !max || (def & ~max))
1695 return -ERANGE;
1696 return 0;
1697 case V4L2_CTRL_TYPE_MENU:
1698 case V4L2_CTRL_TYPE_INTEGER_MENU:
1699 if (min > max || def < min || def > max)
1700 return -ERANGE;
1701 /* Note: step == menu_skip_mask for menu controls.
1702 So here we check if the default value is masked out. */
1703 if (step && ((1 << def) & step))
1704 return -EINVAL;
1705 return 0;
1706 case V4L2_CTRL_TYPE_STRING:
1707 if (min > max || min < 0 || step < 1 || def)
1708 return -ERANGE;
1709 return 0;
1710 default:
1711 return 0;
1712 }
1713 }
1714
1715 /* Validate a new control */
1716 static int validate_new(const struct v4l2_ctrl *ctrl, union v4l2_ctrl_ptr p_new)
1717 {
1718 unsigned idx;
1719 int err = 0;
1720
1721 for (idx = 0; !err && idx < ctrl->elems; idx++)
1722 err = ctrl->type_ops->validate(ctrl, idx, p_new);
1723 return err;
1724 }
1725
1726 static inline u32 node2id(struct list_head *node)
1727 {
1728 return list_entry(node, struct v4l2_ctrl_ref, node)->ctrl->id;
1729 }
1730
1731 /* Set the handler's error code if it wasn't set earlier already */
1732 static inline int handler_set_err(struct v4l2_ctrl_handler *hdl, int err)
1733 {
1734 if (hdl->error == 0)
1735 hdl->error = err;
1736 return err;
1737 }
1738
1739 /* Initialize the handler */
1740 int v4l2_ctrl_handler_init_class(struct v4l2_ctrl_handler *hdl,
1741 unsigned nr_of_controls_hint,
1742 struct lock_class_key *key, const char *name)
1743 {
1744 mutex_init(&hdl->_lock);
1745 hdl->lock = &hdl->_lock;
1746 lockdep_set_class_and_name(hdl->lock, key, name);
1747 INIT_LIST_HEAD(&hdl->ctrls);
1748 INIT_LIST_HEAD(&hdl->ctrl_refs);
1749 hdl->nr_of_buckets = 1 + nr_of_controls_hint / 8;
1750 hdl->buckets = kvmalloc_array(hdl->nr_of_buckets,
1751 sizeof(hdl->buckets[0]),
1752 GFP_KERNEL | __GFP_ZERO);
1753 hdl->error = hdl->buckets ? 0 : -ENOMEM;
1754 return hdl->error;
1755 }
1756 EXPORT_SYMBOL(v4l2_ctrl_handler_init_class);
1757
1758 /* Free all controls and control refs */
1759 void v4l2_ctrl_handler_free(struct v4l2_ctrl_handler *hdl)
1760 {
1761 struct v4l2_ctrl_ref *ref, *next_ref;
1762 struct v4l2_ctrl *ctrl, *next_ctrl;
1763 struct v4l2_subscribed_event *sev, *next_sev;
1764
1765 if (hdl == NULL || hdl->buckets == NULL)
1766 return;
1767
1768 mutex_lock(hdl->lock);
1769 /* Free all nodes */
1770 list_for_each_entry_safe(ref, next_ref, &hdl->ctrl_refs, node) {
1771 list_del(&ref->node);
1772 kfree(ref);
1773 }
1774 /* Free all controls owned by the handler */
1775 list_for_each_entry_safe(ctrl, next_ctrl, &hdl->ctrls, node) {
1776 list_del(&ctrl->node);
1777 list_for_each_entry_safe(sev, next_sev, &ctrl->ev_subs, node)
1778 list_del(&sev->node);
1779 kvfree(ctrl);
1780 }
1781 kvfree(hdl->buckets);
1782 hdl->buckets = NULL;
1783 hdl->cached = NULL;
1784 hdl->error = 0;
1785 mutex_unlock(hdl->lock);
1786 mutex_destroy(&hdl->_lock);
1787 }
1788 EXPORT_SYMBOL(v4l2_ctrl_handler_free);
1789
1790 /* For backwards compatibility: V4L2_CID_PRIVATE_BASE should no longer
1791 be used except in G_CTRL, S_CTRL, QUERYCTRL and QUERYMENU when dealing
1792 with applications that do not use the NEXT_CTRL flag.
1793
1794 We just find the n-th private user control. It's O(N), but that should not
1795 be an issue in this particular case. */
1796 static struct v4l2_ctrl_ref *find_private_ref(
1797 struct v4l2_ctrl_handler *hdl, u32 id)
1798 {
1799 struct v4l2_ctrl_ref *ref;
1800
1801 id -= V4L2_CID_PRIVATE_BASE;
1802 list_for_each_entry(ref, &hdl->ctrl_refs, node) {
1803 /* Search for private user controls that are compatible with
1804 VIDIOC_G/S_CTRL. */
1805 if (V4L2_CTRL_ID2WHICH(ref->ctrl->id) == V4L2_CTRL_CLASS_USER &&
1806 V4L2_CTRL_DRIVER_PRIV(ref->ctrl->id)) {
1807 if (!ref->ctrl->is_int)
1808 continue;
1809 if (id == 0)
1810 return ref;
1811 id--;
1812 }
1813 }
1814 return NULL;
1815 }
1816
1817 /* Find a control with the given ID. */
1818 static struct v4l2_ctrl_ref *find_ref(struct v4l2_ctrl_handler *hdl, u32 id)
1819 {
1820 struct v4l2_ctrl_ref *ref;
1821 int bucket;
1822
1823 id &= V4L2_CTRL_ID_MASK;
1824
1825 /* Old-style private controls need special handling */
1826 if (id >= V4L2_CID_PRIVATE_BASE)
1827 return find_private_ref(hdl, id);
1828 bucket = id % hdl->nr_of_buckets;
1829
1830 /* Simple optimization: cache the last control found */
1831 if (hdl->cached && hdl->cached->ctrl->id == id)
1832 return hdl->cached;
1833
1834 /* Not in cache, search the hash */
1835 ref = hdl->buckets ? hdl->buckets[bucket] : NULL;
1836 while (ref && ref->ctrl->id != id)
1837 ref = ref->next;
1838
1839 if (ref)
1840 hdl->cached = ref; /* cache it! */
1841 return ref;
1842 }
1843
1844 /* Find a control with the given ID. Take the handler's lock first. */
1845 static struct v4l2_ctrl_ref *find_ref_lock(
1846 struct v4l2_ctrl_handler *hdl, u32 id)
1847 {
1848 struct v4l2_ctrl_ref *ref = NULL;
1849
1850 if (hdl) {
1851 mutex_lock(hdl->lock);
1852 ref = find_ref(hdl, id);
1853 mutex_unlock(hdl->lock);
1854 }
1855 return ref;
1856 }
1857
1858 /* Find a control with the given ID. */
1859 struct v4l2_ctrl *v4l2_ctrl_find(struct v4l2_ctrl_handler *hdl, u32 id)
1860 {
1861 struct v4l2_ctrl_ref *ref = find_ref_lock(hdl, id);
1862
1863 return ref ? ref->ctrl : NULL;
1864 }
1865 EXPORT_SYMBOL(v4l2_ctrl_find);
1866
1867 /* Allocate a new v4l2_ctrl_ref and hook it into the handler. */
1868 static int handler_new_ref(struct v4l2_ctrl_handler *hdl,
1869 struct v4l2_ctrl *ctrl)
1870 {
1871 struct v4l2_ctrl_ref *ref;
1872 struct v4l2_ctrl_ref *new_ref;
1873 u32 id = ctrl->id;
1874 u32 class_ctrl = V4L2_CTRL_ID2WHICH(id) | 1;
1875 int bucket = id % hdl->nr_of_buckets; /* which bucket to use */
1876
1877 /*
1878 * Automatically add the control class if it is not yet present and
1879 * the new control is not a compound control.
1880 */
1881 if (ctrl->type < V4L2_CTRL_COMPOUND_TYPES &&
1882 id != class_ctrl && find_ref_lock(hdl, class_ctrl) == NULL)
1883 if (!v4l2_ctrl_new_std(hdl, NULL, class_ctrl, 0, 0, 0, 0))
1884 return hdl->error;
1885
1886 if (hdl->error)
1887 return hdl->error;
1888
1889 new_ref = kzalloc(sizeof(*new_ref), GFP_KERNEL);
1890 if (!new_ref)
1891 return handler_set_err(hdl, -ENOMEM);
1892 new_ref->ctrl = ctrl;
1893 if (ctrl->handler == hdl) {
1894 /* By default each control starts in a cluster of its own.
1895 new_ref->ctrl is basically a cluster array with one
1896 element, so that's perfect to use as the cluster pointer.
1897 But only do this for the handler that owns the control. */
1898 ctrl->cluster = &new_ref->ctrl;
1899 ctrl->ncontrols = 1;
1900 }
1901
1902 INIT_LIST_HEAD(&new_ref->node);
1903
1904 mutex_lock(hdl->lock);
1905
1906 /* Add immediately at the end of the list if the list is empty, or if
1907 the last element in the list has a lower ID.
1908 This ensures that when elements are added in ascending order the
1909 insertion is an O(1) operation. */
1910 if (list_empty(&hdl->ctrl_refs) || id > node2id(hdl->ctrl_refs.prev)) {
1911 list_add_tail(&new_ref->node, &hdl->ctrl_refs);
1912 goto insert_in_hash;
1913 }
1914
1915 /* Find insert position in sorted list */
1916 list_for_each_entry(ref, &hdl->ctrl_refs, node) {
1917 if (ref->ctrl->id < id)
1918 continue;
1919 /* Don't add duplicates */
1920 if (ref->ctrl->id == id) {
1921 kfree(new_ref);
1922 goto unlock;
1923 }
1924 list_add(&new_ref->node, ref->node.prev);
1925 break;
1926 }
1927
1928 insert_in_hash:
1929 /* Insert the control node in the hash */
1930 new_ref->next = hdl->buckets[bucket];
1931 hdl->buckets[bucket] = new_ref;
1932
1933 unlock:
1934 mutex_unlock(hdl->lock);
1935 return 0;
1936 }
1937
1938 /* Add a new control */
1939 static struct v4l2_ctrl *v4l2_ctrl_new(struct v4l2_ctrl_handler *hdl,
1940 const struct v4l2_ctrl_ops *ops,
1941 const struct v4l2_ctrl_type_ops *type_ops,
1942 u32 id, const char *name, enum v4l2_ctrl_type type,
1943 s64 min, s64 max, u64 step, s64 def,
1944 const u32 dims[V4L2_CTRL_MAX_DIMS], u32 elem_size,
1945 u32 flags, const char * const *qmenu,
1946 const s64 *qmenu_int, void *priv)
1947 {
1948 struct v4l2_ctrl *ctrl;
1949 unsigned sz_extra;
1950 unsigned nr_of_dims = 0;
1951 unsigned elems = 1;
1952 bool is_array;
1953 unsigned tot_ctrl_size;
1954 unsigned idx;
1955 void *data;
1956 int err;
1957
1958 if (hdl->error)
1959 return NULL;
1960
1961 while (dims && dims[nr_of_dims]) {
1962 elems *= dims[nr_of_dims];
1963 nr_of_dims++;
1964 if (nr_of_dims == V4L2_CTRL_MAX_DIMS)
1965 break;
1966 }
1967 is_array = nr_of_dims > 0;
1968
1969 /* Prefill elem_size for all types handled by std_type_ops */
1970 switch (type) {
1971 case V4L2_CTRL_TYPE_INTEGER64:
1972 elem_size = sizeof(s64);
1973 break;
1974 case V4L2_CTRL_TYPE_STRING:
1975 elem_size = max + 1;
1976 break;
1977 case V4L2_CTRL_TYPE_U8:
1978 elem_size = sizeof(u8);
1979 break;
1980 case V4L2_CTRL_TYPE_U16:
1981 elem_size = sizeof(u16);
1982 break;
1983 case V4L2_CTRL_TYPE_U32:
1984 elem_size = sizeof(u32);
1985 break;
1986 default:
1987 if (type < V4L2_CTRL_COMPOUND_TYPES)
1988 elem_size = sizeof(s32);
1989 break;
1990 }
1991 tot_ctrl_size = elem_size * elems;
1992
1993 /* Sanity checks */
1994 if (id == 0 || name == NULL || !elem_size ||
1995 id >= V4L2_CID_PRIVATE_BASE ||
1996 (type == V4L2_CTRL_TYPE_MENU && qmenu == NULL) ||
1997 (type == V4L2_CTRL_TYPE_INTEGER_MENU && qmenu_int == NULL)) {
1998 handler_set_err(hdl, -ERANGE);
1999 return NULL;
2000 }
2001 err = check_range(type, min, max, step, def);
2002 if (err) {
2003 handler_set_err(hdl, err);
2004 return NULL;
2005 }
2006 if (type == V4L2_CTRL_TYPE_BITMASK && ((def & ~max) || min || step)) {
2007 handler_set_err(hdl, -ERANGE);
2008 return NULL;
2009 }
2010 if (is_array &&
2011 (type == V4L2_CTRL_TYPE_BUTTON ||
2012 type == V4L2_CTRL_TYPE_CTRL_CLASS)) {
2013 handler_set_err(hdl, -EINVAL);
2014 return NULL;
2015 }
2016
2017 sz_extra = 0;
2018 if (type == V4L2_CTRL_TYPE_BUTTON)
2019 flags |= V4L2_CTRL_FLAG_WRITE_ONLY |
2020 V4L2_CTRL_FLAG_EXECUTE_ON_WRITE;
2021 else if (type == V4L2_CTRL_TYPE_CTRL_CLASS)
2022 flags |= V4L2_CTRL_FLAG_READ_ONLY;
2023 else if (type == V4L2_CTRL_TYPE_INTEGER64 ||
2024 type == V4L2_CTRL_TYPE_STRING ||
2025 type >= V4L2_CTRL_COMPOUND_TYPES ||
2026 is_array)
2027 sz_extra += 2 * tot_ctrl_size;
2028
2029 ctrl = kvzalloc(sizeof(*ctrl) + sz_extra, GFP_KERNEL);
2030 if (ctrl == NULL) {
2031 handler_set_err(hdl, -ENOMEM);
2032 return NULL;
2033 }
2034
2035 INIT_LIST_HEAD(&ctrl->node);
2036 INIT_LIST_HEAD(&ctrl->ev_subs);
2037 ctrl->handler = hdl;
2038 ctrl->ops = ops;
2039 ctrl->type_ops = type_ops ? type_ops : &std_type_ops;
2040 ctrl->id = id;
2041 ctrl->name = name;
2042 ctrl->type = type;
2043 ctrl->flags = flags;
2044 ctrl->minimum = min;
2045 ctrl->maximum = max;
2046 ctrl->step = step;
2047 ctrl->default_value = def;
2048 ctrl->is_string = !is_array && type == V4L2_CTRL_TYPE_STRING;
2049 ctrl->is_ptr = is_array || type >= V4L2_CTRL_COMPOUND_TYPES || ctrl->is_string;
2050 ctrl->is_int = !ctrl->is_ptr && type != V4L2_CTRL_TYPE_INTEGER64;
2051 ctrl->is_array = is_array;
2052 ctrl->elems = elems;
2053 ctrl->nr_of_dims = nr_of_dims;
2054 if (nr_of_dims)
2055 memcpy(ctrl->dims, dims, nr_of_dims * sizeof(dims[0]));
2056 ctrl->elem_size = elem_size;
2057 if (type == V4L2_CTRL_TYPE_MENU)
2058 ctrl->qmenu = qmenu;
2059 else if (type == V4L2_CTRL_TYPE_INTEGER_MENU)
2060 ctrl->qmenu_int = qmenu_int;
2061 ctrl->priv = priv;
2062 ctrl->cur.val = ctrl->val = def;
2063 data = &ctrl[1];
2064
2065 if (!ctrl->is_int) {
2066 ctrl->p_new.p = data;
2067 ctrl->p_cur.p = data + tot_ctrl_size;
2068 } else {
2069 ctrl->p_new.p = &ctrl->val;
2070 ctrl->p_cur.p = &ctrl->cur.val;
2071 }
2072 for (idx = 0; idx < elems; idx++) {
2073 ctrl->type_ops->init(ctrl, idx, ctrl->p_cur);
2074 ctrl->type_ops->init(ctrl, idx, ctrl->p_new);
2075 }
2076
2077 if (handler_new_ref(hdl, ctrl)) {
2078 kvfree(ctrl);
2079 return NULL;
2080 }
2081 mutex_lock(hdl->lock);
2082 list_add_tail(&ctrl->node, &hdl->ctrls);
2083 mutex_unlock(hdl->lock);
2084 return ctrl;
2085 }
2086
2087 struct v4l2_ctrl *v4l2_ctrl_new_custom(struct v4l2_ctrl_handler *hdl,
2088 const struct v4l2_ctrl_config *cfg, void *priv)
2089 {
2090 bool is_menu;
2091 struct v4l2_ctrl *ctrl;
2092 const char *name = cfg->name;
2093 const char * const *qmenu = cfg->qmenu;
2094 const s64 *qmenu_int = cfg->qmenu_int;
2095 enum v4l2_ctrl_type type = cfg->type;
2096 u32 flags = cfg->flags;
2097 s64 min = cfg->min;
2098 s64 max = cfg->max;
2099 u64 step = cfg->step;
2100 s64 def = cfg->def;
2101
2102 if (name == NULL)
2103 v4l2_ctrl_fill(cfg->id, &name, &type, &min, &max, &step,
2104 &def, &flags);
2105
2106 is_menu = (cfg->type == V4L2_CTRL_TYPE_MENU ||
2107 cfg->type == V4L2_CTRL_TYPE_INTEGER_MENU);
2108 if (is_menu)
2109 WARN_ON(step);
2110 else
2111 WARN_ON(cfg->menu_skip_mask);
2112 if (cfg->type == V4L2_CTRL_TYPE_MENU && qmenu == NULL)
2113 qmenu = v4l2_ctrl_get_menu(cfg->id);
2114 else if (cfg->type == V4L2_CTRL_TYPE_INTEGER_MENU &&
2115 qmenu_int == NULL) {
2116 handler_set_err(hdl, -EINVAL);
2117 return NULL;
2118 }
2119
2120 ctrl = v4l2_ctrl_new(hdl, cfg->ops, cfg->type_ops, cfg->id, name,
2121 type, min, max,
2122 is_menu ? cfg->menu_skip_mask : step, def,
2123 cfg->dims, cfg->elem_size,
2124 flags, qmenu, qmenu_int, priv);
2125 if (ctrl)
2126 ctrl->is_private = cfg->is_private;
2127 return ctrl;
2128 }
2129 EXPORT_SYMBOL(v4l2_ctrl_new_custom);
2130
2131 /* Helper function for standard non-menu controls */
2132 struct v4l2_ctrl *v4l2_ctrl_new_std(struct v4l2_ctrl_handler *hdl,
2133 const struct v4l2_ctrl_ops *ops,
2134 u32 id, s64 min, s64 max, u64 step, s64 def)
2135 {
2136 const char *name;
2137 enum v4l2_ctrl_type type;
2138 u32 flags;
2139
2140 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
2141 if (type == V4L2_CTRL_TYPE_MENU ||
2142 type == V4L2_CTRL_TYPE_INTEGER_MENU ||
2143 type >= V4L2_CTRL_COMPOUND_TYPES) {
2144 handler_set_err(hdl, -EINVAL);
2145 return NULL;
2146 }
2147 return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
2148 min, max, step, def, NULL, 0,
2149 flags, NULL, NULL, NULL);
2150 }
2151 EXPORT_SYMBOL(v4l2_ctrl_new_std);
2152
2153 /* Helper function for standard menu controls */
2154 struct v4l2_ctrl *v4l2_ctrl_new_std_menu(struct v4l2_ctrl_handler *hdl,
2155 const struct v4l2_ctrl_ops *ops,
2156 u32 id, u8 _max, u64 mask, u8 _def)
2157 {
2158 const char * const *qmenu = NULL;
2159 const s64 *qmenu_int = NULL;
2160 unsigned int qmenu_int_len = 0;
2161 const char *name;
2162 enum v4l2_ctrl_type type;
2163 s64 min;
2164 s64 max = _max;
2165 s64 def = _def;
2166 u64 step;
2167 u32 flags;
2168
2169 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
2170
2171 if (type == V4L2_CTRL_TYPE_MENU)
2172 qmenu = v4l2_ctrl_get_menu(id);
2173 else if (type == V4L2_CTRL_TYPE_INTEGER_MENU)
2174 qmenu_int = v4l2_ctrl_get_int_menu(id, &qmenu_int_len);
2175
2176 if ((!qmenu && !qmenu_int) || (qmenu_int && max > qmenu_int_len)) {
2177 handler_set_err(hdl, -EINVAL);
2178 return NULL;
2179 }
2180 return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
2181 0, max, mask, def, NULL, 0,
2182 flags, qmenu, qmenu_int, NULL);
2183 }
2184 EXPORT_SYMBOL(v4l2_ctrl_new_std_menu);
2185
2186 /* Helper function for standard menu controls with driver defined menu */
2187 struct v4l2_ctrl *v4l2_ctrl_new_std_menu_items(struct v4l2_ctrl_handler *hdl,
2188 const struct v4l2_ctrl_ops *ops, u32 id, u8 _max,
2189 u64 mask, u8 _def, const char * const *qmenu)
2190 {
2191 enum v4l2_ctrl_type type;
2192 const char *name;
2193 u32 flags;
2194 u64 step;
2195 s64 min;
2196 s64 max = _max;
2197 s64 def = _def;
2198
2199 /* v4l2_ctrl_new_std_menu_items() should only be called for
2200 * standard controls without a standard menu.
2201 */
2202 if (v4l2_ctrl_get_menu(id)) {
2203 handler_set_err(hdl, -EINVAL);
2204 return NULL;
2205 }
2206
2207 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
2208 if (type != V4L2_CTRL_TYPE_MENU || qmenu == NULL) {
2209 handler_set_err(hdl, -EINVAL);
2210 return NULL;
2211 }
2212 return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
2213 0, max, mask, def, NULL, 0,
2214 flags, qmenu, NULL, NULL);
2215
2216 }
2217 EXPORT_SYMBOL(v4l2_ctrl_new_std_menu_items);
2218
2219 /* Helper function for standard integer menu controls */
2220 struct v4l2_ctrl *v4l2_ctrl_new_int_menu(struct v4l2_ctrl_handler *hdl,
2221 const struct v4l2_ctrl_ops *ops,
2222 u32 id, u8 _max, u8 _def, const s64 *qmenu_int)
2223 {
2224 const char *name;
2225 enum v4l2_ctrl_type type;
2226 s64 min;
2227 u64 step;
2228 s64 max = _max;
2229 s64 def = _def;
2230 u32 flags;
2231
2232 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
2233 if (type != V4L2_CTRL_TYPE_INTEGER_MENU) {
2234 handler_set_err(hdl, -EINVAL);
2235 return NULL;
2236 }
2237 return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
2238 0, max, 0, def, NULL, 0,
2239 flags, NULL, qmenu_int, NULL);
2240 }
2241 EXPORT_SYMBOL(v4l2_ctrl_new_int_menu);
2242
2243 /* Add the controls from another handler to our own. */
2244 int v4l2_ctrl_add_handler(struct v4l2_ctrl_handler *hdl,
2245 struct v4l2_ctrl_handler *add,
2246 bool (*filter)(const struct v4l2_ctrl *ctrl))
2247 {
2248 struct v4l2_ctrl_ref *ref;
2249 int ret = 0;
2250
2251 /* Do nothing if either handler is NULL or if they are the same */
2252 if (!hdl || !add || hdl == add)
2253 return 0;
2254 if (hdl->error)
2255 return hdl->error;
2256 mutex_lock(add->lock);
2257 list_for_each_entry(ref, &add->ctrl_refs, node) {
2258 struct v4l2_ctrl *ctrl = ref->ctrl;
2259
2260 /* Skip handler-private controls. */
2261 if (ctrl->is_private)
2262 continue;
2263 /* And control classes */
2264 if (ctrl->type == V4L2_CTRL_TYPE_CTRL_CLASS)
2265 continue;
2266 /* Filter any unwanted controls */
2267 if (filter && !filter(ctrl))
2268 continue;
2269 ret = handler_new_ref(hdl, ctrl);
2270 if (ret)
2271 break;
2272 }
2273 mutex_unlock(add->lock);
2274 return ret;
2275 }
2276 EXPORT_SYMBOL(v4l2_ctrl_add_handler);
2277
2278 bool v4l2_ctrl_radio_filter(const struct v4l2_ctrl *ctrl)
2279 {
2280 if (V4L2_CTRL_ID2WHICH(ctrl->id) == V4L2_CTRL_CLASS_FM_TX)
2281 return true;
2282 if (V4L2_CTRL_ID2WHICH(ctrl->id) == V4L2_CTRL_CLASS_FM_RX)
2283 return true;
2284 switch (ctrl->id) {
2285 case V4L2_CID_AUDIO_MUTE:
2286 case V4L2_CID_AUDIO_VOLUME:
2287 case V4L2_CID_AUDIO_BALANCE:
2288 case V4L2_CID_AUDIO_BASS:
2289 case V4L2_CID_AUDIO_TREBLE:
2290 case V4L2_CID_AUDIO_LOUDNESS:
2291 return true;
2292 default:
2293 break;
2294 }
2295 return false;
2296 }
2297 EXPORT_SYMBOL(v4l2_ctrl_radio_filter);
2298
2299 /* Cluster controls */
2300 void v4l2_ctrl_cluster(unsigned ncontrols, struct v4l2_ctrl **controls)
2301 {
2302 bool has_volatiles = false;
2303 int i;
2304
2305 /* The first control is the master control and it must not be NULL */
2306 if (WARN_ON(ncontrols == 0 || controls[0] == NULL))
2307 return;
2308
2309 for (i = 0; i < ncontrols; i++) {
2310 if (controls[i]) {
2311 controls[i]->cluster = controls;
2312 controls[i]->ncontrols = ncontrols;
2313 if (controls[i]->flags & V4L2_CTRL_FLAG_VOLATILE)
2314 has_volatiles = true;
2315 }
2316 }
2317 controls[0]->has_volatiles = has_volatiles;
2318 }
2319 EXPORT_SYMBOL(v4l2_ctrl_cluster);
2320
2321 void v4l2_ctrl_auto_cluster(unsigned ncontrols, struct v4l2_ctrl **controls,
2322 u8 manual_val, bool set_volatile)
2323 {
2324 struct v4l2_ctrl *master = controls[0];
2325 u32 flag = 0;
2326 int i;
2327
2328 v4l2_ctrl_cluster(ncontrols, controls);
2329 WARN_ON(ncontrols <= 1);
2330 WARN_ON(manual_val < master->minimum || manual_val > master->maximum);
2331 WARN_ON(set_volatile && !has_op(master, g_volatile_ctrl));
2332 master->is_auto = true;
2333 master->has_volatiles = set_volatile;
2334 master->manual_mode_value = manual_val;
2335 master->flags |= V4L2_CTRL_FLAG_UPDATE;
2336
2337 if (!is_cur_manual(master))
2338 flag = V4L2_CTRL_FLAG_INACTIVE |
2339 (set_volatile ? V4L2_CTRL_FLAG_VOLATILE : 0);
2340
2341 for (i = 1; i < ncontrols; i++)
2342 if (controls[i])
2343 controls[i]->flags |= flag;
2344 }
2345 EXPORT_SYMBOL(v4l2_ctrl_auto_cluster);
2346
2347 /* Activate/deactivate a control. */
2348 void v4l2_ctrl_activate(struct v4l2_ctrl *ctrl, bool active)
2349 {
2350 /* invert since the actual flag is called 'inactive' */
2351 bool inactive = !active;
2352 bool old;
2353
2354 if (ctrl == NULL)
2355 return;
2356
2357 if (inactive)
2358 /* set V4L2_CTRL_FLAG_INACTIVE */
2359 old = test_and_set_bit(4, &ctrl->flags);
2360 else
2361 /* clear V4L2_CTRL_FLAG_INACTIVE */
2362 old = test_and_clear_bit(4, &ctrl->flags);
2363 if (old != inactive)
2364 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_FLAGS);
2365 }
2366 EXPORT_SYMBOL(v4l2_ctrl_activate);
2367
2368 /* Grab/ungrab a control.
2369 Typically used when streaming starts and you want to grab controls,
2370 preventing the user from changing them.
2371
2372 Just call this and the framework will block any attempts to change
2373 these controls. */
2374 void v4l2_ctrl_grab(struct v4l2_ctrl *ctrl, bool grabbed)
2375 {
2376 bool old;
2377
2378 if (ctrl == NULL)
2379 return;
2380
2381 v4l2_ctrl_lock(ctrl);
2382 if (grabbed)
2383 /* set V4L2_CTRL_FLAG_GRABBED */
2384 old = test_and_set_bit(1, &ctrl->flags);
2385 else
2386 /* clear V4L2_CTRL_FLAG_GRABBED */
2387 old = test_and_clear_bit(1, &ctrl->flags);
2388 if (old != grabbed)
2389 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_FLAGS);
2390 v4l2_ctrl_unlock(ctrl);
2391 }
2392 EXPORT_SYMBOL(v4l2_ctrl_grab);
2393
2394 /* Log the control name and value */
2395 static void log_ctrl(const struct v4l2_ctrl *ctrl,
2396 const char *prefix, const char *colon)
2397 {
2398 if (ctrl->flags & (V4L2_CTRL_FLAG_DISABLED | V4L2_CTRL_FLAG_WRITE_ONLY))
2399 return;
2400 if (ctrl->type == V4L2_CTRL_TYPE_CTRL_CLASS)
2401 return;
2402
2403 pr_info("%s%s%s: ", prefix, colon, ctrl->name);
2404
2405 ctrl->type_ops->log(ctrl);
2406
2407 if (ctrl->flags & (V4L2_CTRL_FLAG_INACTIVE |
2408 V4L2_CTRL_FLAG_GRABBED |
2409 V4L2_CTRL_FLAG_VOLATILE)) {
2410 if (ctrl->flags & V4L2_CTRL_FLAG_INACTIVE)
2411 pr_cont(" inactive");
2412 if (ctrl->flags & V4L2_CTRL_FLAG_GRABBED)
2413 pr_cont(" grabbed");
2414 if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE)
2415 pr_cont(" volatile");
2416 }
2417 pr_cont("\n");
2418 }
2419
2420 /* Log all controls owned by the handler */
2421 void v4l2_ctrl_handler_log_status(struct v4l2_ctrl_handler *hdl,
2422 const char *prefix)
2423 {
2424 struct v4l2_ctrl *ctrl;
2425 const char *colon = "";
2426 int len;
2427
2428 if (hdl == NULL)
2429 return;
2430 if (prefix == NULL)
2431 prefix = "";
2432 len = strlen(prefix);
2433 if (len && prefix[len - 1] != ' ')
2434 colon = ": ";
2435 mutex_lock(hdl->lock);
2436 list_for_each_entry(ctrl, &hdl->ctrls, node)
2437 if (!(ctrl->flags & V4L2_CTRL_FLAG_DISABLED))
2438 log_ctrl(ctrl, prefix, colon);
2439 mutex_unlock(hdl->lock);
2440 }
2441 EXPORT_SYMBOL(v4l2_ctrl_handler_log_status);
2442
2443 int v4l2_ctrl_subdev_log_status(struct v4l2_subdev *sd)
2444 {
2445 v4l2_ctrl_handler_log_status(sd->ctrl_handler, sd->name);
2446 return 0;
2447 }
2448 EXPORT_SYMBOL(v4l2_ctrl_subdev_log_status);
2449
2450 /* Call s_ctrl for all controls owned by the handler */
2451 int __v4l2_ctrl_handler_setup(struct v4l2_ctrl_handler *hdl)
2452 {
2453 struct v4l2_ctrl *ctrl;
2454 int ret = 0;
2455
2456 if (hdl == NULL)
2457 return 0;
2458
2459 lockdep_assert_held(hdl->lock);
2460
2461 list_for_each_entry(ctrl, &hdl->ctrls, node)
2462 ctrl->done = false;
2463
2464 list_for_each_entry(ctrl, &hdl->ctrls, node) {
2465 struct v4l2_ctrl *master = ctrl->cluster[0];
2466 int i;
2467
2468 /* Skip if this control was already handled by a cluster. */
2469 /* Skip button controls and read-only controls. */
2470 if (ctrl->done || ctrl->type == V4L2_CTRL_TYPE_BUTTON ||
2471 (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY))
2472 continue;
2473
2474 for (i = 0; i < master->ncontrols; i++) {
2475 if (master->cluster[i]) {
2476 cur_to_new(master->cluster[i]);
2477 master->cluster[i]->is_new = 1;
2478 master->cluster[i]->done = true;
2479 }
2480 }
2481 ret = call_op(master, s_ctrl);
2482 if (ret)
2483 break;
2484 }
2485
2486 return ret;
2487 }
2488 EXPORT_SYMBOL_GPL(__v4l2_ctrl_handler_setup);
2489
2490 int v4l2_ctrl_handler_setup(struct v4l2_ctrl_handler *hdl)
2491 {
2492 int ret;
2493
2494 if (hdl == NULL)
2495 return 0;
2496
2497 mutex_lock(hdl->lock);
2498 ret = __v4l2_ctrl_handler_setup(hdl);
2499 mutex_unlock(hdl->lock);
2500
2501 return ret;
2502 }
2503 EXPORT_SYMBOL(v4l2_ctrl_handler_setup);
2504
2505 /* Implement VIDIOC_QUERY_EXT_CTRL */
2506 int v4l2_query_ext_ctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_query_ext_ctrl *qc)
2507 {
2508 const unsigned next_flags = V4L2_CTRL_FLAG_NEXT_CTRL | V4L2_CTRL_FLAG_NEXT_COMPOUND;
2509 u32 id = qc->id & V4L2_CTRL_ID_MASK;
2510 struct v4l2_ctrl_ref *ref;
2511 struct v4l2_ctrl *ctrl;
2512
2513 if (hdl == NULL)
2514 return -EINVAL;
2515
2516 mutex_lock(hdl->lock);
2517
2518 /* Try to find it */
2519 ref = find_ref(hdl, id);
2520
2521 if ((qc->id & next_flags) && !list_empty(&hdl->ctrl_refs)) {
2522 bool is_compound;
2523 /* Match any control that is not hidden */
2524 unsigned mask = 1;
2525 bool match = false;
2526
2527 if ((qc->id & next_flags) == V4L2_CTRL_FLAG_NEXT_COMPOUND) {
2528 /* Match any hidden control */
2529 match = true;
2530 } else if ((qc->id & next_flags) == next_flags) {
2531 /* Match any control, compound or not */
2532 mask = 0;
2533 }
2534
2535 /* Find the next control with ID > qc->id */
2536
2537 /* Did we reach the end of the control list? */
2538 if (id >= node2id(hdl->ctrl_refs.prev)) {
2539 ref = NULL; /* Yes, so there is no next control */
2540 } else if (ref) {
2541 /* We found a control with the given ID, so just get
2542 the next valid one in the list. */
2543 list_for_each_entry_continue(ref, &hdl->ctrl_refs, node) {
2544 is_compound = ref->ctrl->is_array ||
2545 ref->ctrl->type >= V4L2_CTRL_COMPOUND_TYPES;
2546 if (id < ref->ctrl->id &&
2547 (is_compound & mask) == match)
2548 break;
2549 }
2550 if (&ref->node == &hdl->ctrl_refs)
2551 ref = NULL;
2552 } else {
2553 /* No control with the given ID exists, so start
2554 searching for the next largest ID. We know there
2555 is one, otherwise the first 'if' above would have
2556 been true. */
2557 list_for_each_entry(ref, &hdl->ctrl_refs, node) {
2558 is_compound = ref->ctrl->is_array ||
2559 ref->ctrl->type >= V4L2_CTRL_COMPOUND_TYPES;
2560 if (id < ref->ctrl->id &&
2561 (is_compound & mask) == match)
2562 break;
2563 }
2564 if (&ref->node == &hdl->ctrl_refs)
2565 ref = NULL;
2566 }
2567 }
2568 mutex_unlock(hdl->lock);
2569
2570 if (!ref)
2571 return -EINVAL;
2572
2573 ctrl = ref->ctrl;
2574 memset(qc, 0, sizeof(*qc));
2575 if (id >= V4L2_CID_PRIVATE_BASE)
2576 qc->id = id;
2577 else
2578 qc->id = ctrl->id;
2579 strlcpy(qc->name, ctrl->name, sizeof(qc->name));
2580 qc->flags = ctrl->flags;
2581 qc->type = ctrl->type;
2582 if (ctrl->is_ptr)
2583 qc->flags |= V4L2_CTRL_FLAG_HAS_PAYLOAD;
2584 qc->elem_size = ctrl->elem_size;
2585 qc->elems = ctrl->elems;
2586 qc->nr_of_dims = ctrl->nr_of_dims;
2587 memcpy(qc->dims, ctrl->dims, qc->nr_of_dims * sizeof(qc->dims[0]));
2588 qc->minimum = ctrl->minimum;
2589 qc->maximum = ctrl->maximum;
2590 qc->default_value = ctrl->default_value;
2591 if (ctrl->type == V4L2_CTRL_TYPE_MENU
2592 || ctrl->type == V4L2_CTRL_TYPE_INTEGER_MENU)
2593 qc->step = 1;
2594 else
2595 qc->step = ctrl->step;
2596 return 0;
2597 }
2598 EXPORT_SYMBOL(v4l2_query_ext_ctrl);
2599
2600 /* Implement VIDIOC_QUERYCTRL */
2601 int v4l2_queryctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_queryctrl *qc)
2602 {
2603 struct v4l2_query_ext_ctrl qec = { qc->id };
2604 int rc;
2605
2606 rc = v4l2_query_ext_ctrl(hdl, &qec);
2607 if (rc)
2608 return rc;
2609
2610 qc->id = qec.id;
2611 qc->type = qec.type;
2612 qc->flags = qec.flags;
2613 strlcpy(qc->name, qec.name, sizeof(qc->name));
2614 switch (qc->type) {
2615 case V4L2_CTRL_TYPE_INTEGER:
2616 case V4L2_CTRL_TYPE_BOOLEAN:
2617 case V4L2_CTRL_TYPE_MENU:
2618 case V4L2_CTRL_TYPE_INTEGER_MENU:
2619 case V4L2_CTRL_TYPE_STRING:
2620 case V4L2_CTRL_TYPE_BITMASK:
2621 qc->minimum = qec.minimum;
2622 qc->maximum = qec.maximum;
2623 qc->step = qec.step;
2624 qc->default_value = qec.default_value;
2625 break;
2626 default:
2627 qc->minimum = 0;
2628 qc->maximum = 0;
2629 qc->step = 0;
2630 qc->default_value = 0;
2631 break;
2632 }
2633 return 0;
2634 }
2635 EXPORT_SYMBOL(v4l2_queryctrl);
2636
2637 /* Implement VIDIOC_QUERYMENU */
2638 int v4l2_querymenu(struct v4l2_ctrl_handler *hdl, struct v4l2_querymenu *qm)
2639 {
2640 struct v4l2_ctrl *ctrl;
2641 u32 i = qm->index;
2642
2643 ctrl = v4l2_ctrl_find(hdl, qm->id);
2644 if (!ctrl)
2645 return -EINVAL;
2646
2647 qm->reserved = 0;
2648 /* Sanity checks */
2649 switch (ctrl->type) {
2650 case V4L2_CTRL_TYPE_MENU:
2651 if (ctrl->qmenu == NULL)
2652 return -EINVAL;
2653 break;
2654 case V4L2_CTRL_TYPE_INTEGER_MENU:
2655 if (ctrl->qmenu_int == NULL)
2656 return -EINVAL;
2657 break;
2658 default:
2659 return -EINVAL;
2660 }
2661
2662 if (i < ctrl->minimum || i > ctrl->maximum)
2663 return -EINVAL;
2664
2665 /* Use mask to see if this menu item should be skipped */
2666 if (ctrl->menu_skip_mask & (1 << i))
2667 return -EINVAL;
2668 /* Empty menu items should also be skipped */
2669 if (ctrl->type == V4L2_CTRL_TYPE_MENU) {
2670 if (ctrl->qmenu[i] == NULL || ctrl->qmenu[i][0] == '\0')
2671 return -EINVAL;
2672 strlcpy(qm->name, ctrl->qmenu[i], sizeof(qm->name));
2673 } else {
2674 qm->value = ctrl->qmenu_int[i];
2675 }
2676 return 0;
2677 }
2678 EXPORT_SYMBOL(v4l2_querymenu);
2679
2680
2681 /* Some general notes on the atomic requirements of VIDIOC_G/TRY/S_EXT_CTRLS:
2682
2683 It is not a fully atomic operation, just best-effort only. After all, if
2684 multiple controls have to be set through multiple i2c writes (for example)
2685 then some initial writes may succeed while others fail. Thus leaving the
2686 system in an inconsistent state. The question is how much effort you are
2687 willing to spend on trying to make something atomic that really isn't.
2688
2689 From the point of view of an application the main requirement is that
2690 when you call VIDIOC_S_EXT_CTRLS and some values are invalid then an
2691 error should be returned without actually affecting any controls.
2692
2693 If all the values are correct, then it is acceptable to just give up
2694 in case of low-level errors.
2695
2696 It is important though that the application can tell when only a partial
2697 configuration was done. The way we do that is through the error_idx field
2698 of struct v4l2_ext_controls: if that is equal to the count field then no
2699 controls were affected. Otherwise all controls before that index were
2700 successful in performing their 'get' or 'set' operation, the control at
2701 the given index failed, and you don't know what happened with the controls
2702 after the failed one. Since if they were part of a control cluster they
2703 could have been successfully processed (if a cluster member was encountered
2704 at index < error_idx), they could have failed (if a cluster member was at
2705 error_idx), or they may not have been processed yet (if the first cluster
2706 member appeared after error_idx).
2707
2708 It is all fairly theoretical, though. In practice all you can do is to
2709 bail out. If error_idx == count, then it is an application bug. If
2710 error_idx < count then it is only an application bug if the error code was
2711 EBUSY. That usually means that something started streaming just when you
2712 tried to set the controls. In all other cases it is a driver/hardware
2713 problem and all you can do is to retry or bail out.
2714
2715 Note that these rules do not apply to VIDIOC_TRY_EXT_CTRLS: since that
2716 never modifies controls the error_idx is just set to whatever control
2717 has an invalid value.
2718 */
2719
2720 /* Prepare for the extended g/s/try functions.
2721 Find the controls in the control array and do some basic checks. */
2722 static int prepare_ext_ctrls(struct v4l2_ctrl_handler *hdl,
2723 struct v4l2_ext_controls *cs,
2724 struct v4l2_ctrl_helper *helpers,
2725 bool get)
2726 {
2727 struct v4l2_ctrl_helper *h;
2728 bool have_clusters = false;
2729 u32 i;
2730
2731 for (i = 0, h = helpers; i < cs->count; i++, h++) {
2732 struct v4l2_ext_control *c = &cs->controls[i];
2733 struct v4l2_ctrl_ref *ref;
2734 struct v4l2_ctrl *ctrl;
2735 u32 id = c->id & V4L2_CTRL_ID_MASK;
2736
2737 cs->error_idx = i;
2738
2739 if (cs->which &&
2740 cs->which != V4L2_CTRL_WHICH_DEF_VAL &&
2741 V4L2_CTRL_ID2WHICH(id) != cs->which)
2742 return -EINVAL;
2743
2744 /* Old-style private controls are not allowed for
2745 extended controls */
2746 if (id >= V4L2_CID_PRIVATE_BASE)
2747 return -EINVAL;
2748 ref = find_ref_lock(hdl, id);
2749 if (ref == NULL)
2750 return -EINVAL;
2751 ctrl = ref->ctrl;
2752 if (ctrl->flags & V4L2_CTRL_FLAG_DISABLED)
2753 return -EINVAL;
2754
2755 if (ctrl->cluster[0]->ncontrols > 1)
2756 have_clusters = true;
2757 if (ctrl->cluster[0] != ctrl)
2758 ref = find_ref_lock(hdl, ctrl->cluster[0]->id);
2759 if (ctrl->is_ptr && !ctrl->is_string) {
2760 unsigned tot_size = ctrl->elems * ctrl->elem_size;
2761
2762 if (c->size < tot_size) {
2763 if (get) {
2764 c->size = tot_size;
2765 return -ENOSPC;
2766 }
2767 return -EFAULT;
2768 }
2769 c->size = tot_size;
2770 }
2771 /* Store the ref to the master control of the cluster */
2772 h->mref = ref;
2773 h->ctrl = ctrl;
2774 /* Initially set next to 0, meaning that there is no other
2775 control in this helper array belonging to the same
2776 cluster */
2777 h->next = 0;
2778 }
2779
2780 /* We are done if there were no controls that belong to a multi-
2781 control cluster. */
2782 if (!have_clusters)
2783 return 0;
2784
2785 /* The code below figures out in O(n) time which controls in the list
2786 belong to the same cluster. */
2787
2788 /* This has to be done with the handler lock taken. */
2789 mutex_lock(hdl->lock);
2790
2791 /* First zero the helper field in the master control references */
2792 for (i = 0; i < cs->count; i++)
2793 helpers[i].mref->helper = NULL;
2794 for (i = 0, h = helpers; i < cs->count; i++, h++) {
2795 struct v4l2_ctrl_ref *mref = h->mref;
2796
2797 /* If the mref->helper is set, then it points to an earlier
2798 helper that belongs to the same cluster. */
2799 if (mref->helper) {
2800 /* Set the next field of mref->helper to the current
2801 index: this means that that earlier helper now
2802 points to the next helper in the same cluster. */
2803 mref->helper->next = i;
2804 /* mref should be set only for the first helper in the
2805 cluster, clear the others. */
2806 h->mref = NULL;
2807 }
2808 /* Point the mref helper to the current helper struct. */
2809 mref->helper = h;
2810 }
2811 mutex_unlock(hdl->lock);
2812 return 0;
2813 }
2814
2815 /* Handles the corner case where cs->count == 0. It checks whether the
2816 specified control class exists. If that class ID is 0, then it checks
2817 whether there are any controls at all. */
2818 static int class_check(struct v4l2_ctrl_handler *hdl, u32 which)
2819 {
2820 if (which == 0 || which == V4L2_CTRL_WHICH_DEF_VAL)
2821 return list_empty(&hdl->ctrl_refs) ? -EINVAL : 0;
2822 return find_ref_lock(hdl, which | 1) ? 0 : -EINVAL;
2823 }
2824
2825
2826
2827 /* Get extended controls. Allocates the helpers array if needed. */
2828 int v4l2_g_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *cs)
2829 {
2830 struct v4l2_ctrl_helper helper[4];
2831 struct v4l2_ctrl_helper *helpers = helper;
2832 int ret;
2833 int i, j;
2834 bool def_value;
2835
2836 def_value = (cs->which == V4L2_CTRL_WHICH_DEF_VAL);
2837
2838 cs->error_idx = cs->count;
2839 cs->which = V4L2_CTRL_ID2WHICH(cs->which);
2840
2841 if (hdl == NULL)
2842 return -EINVAL;
2843
2844 if (cs->count == 0)
2845 return class_check(hdl, cs->which);
2846
2847 if (cs->count > ARRAY_SIZE(helper)) {
2848 helpers = kvmalloc_array(cs->count, sizeof(helper[0]),
2849 GFP_KERNEL);
2850 if (helpers == NULL)
2851 return -ENOMEM;
2852 }
2853
2854 ret = prepare_ext_ctrls(hdl, cs, helpers, true);
2855 cs->error_idx = cs->count;
2856
2857 for (i = 0; !ret && i < cs->count; i++)
2858 if (helpers[i].ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY)
2859 ret = -EACCES;
2860
2861 for (i = 0; !ret && i < cs->count; i++) {
2862 int (*ctrl_to_user)(struct v4l2_ext_control *c,
2863 struct v4l2_ctrl *ctrl);
2864 struct v4l2_ctrl *master;
2865
2866 ctrl_to_user = def_value ? def_to_user : cur_to_user;
2867
2868 if (helpers[i].mref == NULL)
2869 continue;
2870
2871 master = helpers[i].mref->ctrl;
2872 cs->error_idx = i;
2873
2874 v4l2_ctrl_lock(master);
2875
2876 /* g_volatile_ctrl will update the new control values */
2877 if (!def_value &&
2878 ((master->flags & V4L2_CTRL_FLAG_VOLATILE) ||
2879 (master->has_volatiles && !is_cur_manual(master)))) {
2880 for (j = 0; j < master->ncontrols; j++)
2881 cur_to_new(master->cluster[j]);
2882 ret = call_op(master, g_volatile_ctrl);
2883 ctrl_to_user = new_to_user;
2884 }
2885 /* If OK, then copy the current (for non-volatile controls)
2886 or the new (for volatile controls) control values to the
2887 caller */
2888 if (!ret) {
2889 u32 idx = i;
2890
2891 do {
2892 ret = ctrl_to_user(cs->controls + idx,
2893 helpers[idx].ctrl);
2894 idx = helpers[idx].next;
2895 } while (!ret && idx);
2896 }
2897 v4l2_ctrl_unlock(master);
2898 }
2899
2900 if (cs->count > ARRAY_SIZE(helper))
2901 kvfree(helpers);
2902 return ret;
2903 }
2904 EXPORT_SYMBOL(v4l2_g_ext_ctrls);
2905
2906 /* Helper function to get a single control */
2907 static int get_ctrl(struct v4l2_ctrl *ctrl, struct v4l2_ext_control *c)
2908 {
2909 struct v4l2_ctrl *master = ctrl->cluster[0];
2910 int ret = 0;
2911 int i;
2912
2913 /* Compound controls are not supported. The new_to_user() and
2914 * cur_to_user() calls below would need to be modified not to access
2915 * userspace memory when called from get_ctrl().
2916 */
2917 if (!ctrl->is_int && ctrl->type != V4L2_CTRL_TYPE_INTEGER64)
2918 return -EINVAL;
2919
2920 if (ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY)
2921 return -EACCES;
2922
2923 v4l2_ctrl_lock(master);
2924 /* g_volatile_ctrl will update the current control values */
2925 if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE) {
2926 for (i = 0; i < master->ncontrols; i++)
2927 cur_to_new(master->cluster[i]);
2928 ret = call_op(master, g_volatile_ctrl);
2929 new_to_user(c, ctrl);
2930 } else {
2931 cur_to_user(c, ctrl);
2932 }
2933 v4l2_ctrl_unlock(master);
2934 return ret;
2935 }
2936
2937 int v4l2_g_ctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_control *control)
2938 {
2939 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, control->id);
2940 struct v4l2_ext_control c;
2941 int ret;
2942
2943 if (ctrl == NULL || !ctrl->is_int)
2944 return -EINVAL;
2945 ret = get_ctrl(ctrl, &c);
2946 control->value = c.value;
2947 return ret;
2948 }
2949 EXPORT_SYMBOL(v4l2_g_ctrl);
2950
2951 s32 v4l2_ctrl_g_ctrl(struct v4l2_ctrl *ctrl)
2952 {
2953 struct v4l2_ext_control c;
2954
2955 /* It's a driver bug if this happens. */
2956 WARN_ON(!ctrl->is_int);
2957 c.value = 0;
2958 get_ctrl(ctrl, &c);
2959 return c.value;
2960 }
2961 EXPORT_SYMBOL(v4l2_ctrl_g_ctrl);
2962
2963 s64 v4l2_ctrl_g_ctrl_int64(struct v4l2_ctrl *ctrl)
2964 {
2965 struct v4l2_ext_control c;
2966
2967 /* It's a driver bug if this happens. */
2968 WARN_ON(ctrl->is_ptr || ctrl->type != V4L2_CTRL_TYPE_INTEGER64);
2969 c.value64 = 0;
2970 get_ctrl(ctrl, &c);
2971 return c.value64;
2972 }
2973 EXPORT_SYMBOL(v4l2_ctrl_g_ctrl_int64);
2974
2975
2976 /* Core function that calls try/s_ctrl and ensures that the new value is
2977 copied to the current value on a set.
2978 Must be called with ctrl->handler->lock held. */
2979 static int try_or_set_cluster(struct v4l2_fh *fh, struct v4l2_ctrl *master,
2980 bool set, u32 ch_flags)
2981 {
2982 bool update_flag;
2983 int ret;
2984 int i;
2985
2986 /* Go through the cluster and either validate the new value or
2987 (if no new value was set), copy the current value to the new
2988 value, ensuring a consistent view for the control ops when
2989 called. */
2990 for (i = 0; i < master->ncontrols; i++) {
2991 struct v4l2_ctrl *ctrl = master->cluster[i];
2992
2993 if (ctrl == NULL)
2994 continue;
2995
2996 if (!ctrl->is_new) {
2997 cur_to_new(ctrl);
2998 continue;
2999 }
3000 /* Check again: it may have changed since the
3001 previous check in try_or_set_ext_ctrls(). */
3002 if (set && (ctrl->flags & V4L2_CTRL_FLAG_GRABBED))
3003 return -EBUSY;
3004 }
3005
3006 ret = call_op(master, try_ctrl);
3007
3008 /* Don't set if there is no change */
3009 if (ret || !set || !cluster_changed(master))
3010 return ret;
3011 ret = call_op(master, s_ctrl);
3012 if (ret)
3013 return ret;
3014
3015 /* If OK, then make the new values permanent. */
3016 update_flag = is_cur_manual(master) != is_new_manual(master);
3017 for (i = 0; i < master->ncontrols; i++)
3018 new_to_cur(fh, master->cluster[i], ch_flags |
3019 ((update_flag && i > 0) ? V4L2_EVENT_CTRL_CH_FLAGS : 0));
3020 return 0;
3021 }
3022
3023 /* Validate controls. */
3024 static int validate_ctrls(struct v4l2_ext_controls *cs,
3025 struct v4l2_ctrl_helper *helpers, bool set)
3026 {
3027 unsigned i;
3028 int ret = 0;
3029
3030 cs->error_idx = cs->count;
3031 for (i = 0; i < cs->count; i++) {
3032 struct v4l2_ctrl *ctrl = helpers[i].ctrl;
3033 union v4l2_ctrl_ptr p_new;
3034
3035 cs->error_idx = i;
3036
3037 if (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY)
3038 return -EACCES;
3039 /* This test is also done in try_set_control_cluster() which
3040 is called in atomic context, so that has the final say,
3041 but it makes sense to do an up-front check as well. Once
3042 an error occurs in try_set_control_cluster() some other
3043 controls may have been set already and we want to do a
3044 best-effort to avoid that. */
3045 if (set && (ctrl->flags & V4L2_CTRL_FLAG_GRABBED))
3046 return -EBUSY;
3047 /*
3048 * Skip validation for now if the payload needs to be copied
3049 * from userspace into kernelspace. We'll validate those later.
3050 */
3051 if (ctrl->is_ptr)
3052 continue;
3053 if (ctrl->type == V4L2_CTRL_TYPE_INTEGER64)
3054 p_new.p_s64 = &cs->controls[i].value64;
3055 else
3056 p_new.p_s32 = &cs->controls[i].value;
3057 ret = validate_new(ctrl, p_new);
3058 if (ret)
3059 return ret;
3060 }
3061 return 0;
3062 }
3063
3064 /* Obtain the current volatile values of an autocluster and mark them
3065 as new. */
3066 static void update_from_auto_cluster(struct v4l2_ctrl *master)
3067 {
3068 int i;
3069
3070 for (i = 1; i < master->ncontrols; i++)
3071 cur_to_new(master->cluster[i]);
3072 if (!call_op(master, g_volatile_ctrl))
3073 for (i = 1; i < master->ncontrols; i++)
3074 if (master->cluster[i])
3075 master->cluster[i]->is_new = 1;
3076 }
3077
3078 /* Try or try-and-set controls */
3079 static int try_set_ext_ctrls(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
3080 struct v4l2_ext_controls *cs,
3081 bool set)
3082 {
3083 struct v4l2_ctrl_helper helper[4];
3084 struct v4l2_ctrl_helper *helpers = helper;
3085 unsigned i, j;
3086 int ret;
3087
3088 cs->error_idx = cs->count;
3089
3090 /* Default value cannot be changed */
3091 if (cs->which == V4L2_CTRL_WHICH_DEF_VAL)
3092 return -EINVAL;
3093
3094 cs->which = V4L2_CTRL_ID2WHICH(cs->which);
3095
3096 if (hdl == NULL)
3097 return -EINVAL;
3098
3099 if (cs->count == 0)
3100 return class_check(hdl, cs->which);
3101
3102 if (cs->count > ARRAY_SIZE(helper)) {
3103 helpers = kvmalloc_array(cs->count, sizeof(helper[0]),
3104 GFP_KERNEL);
3105 if (!helpers)
3106 return -ENOMEM;
3107 }
3108 ret = prepare_ext_ctrls(hdl, cs, helpers, false);
3109 if (!ret)
3110 ret = validate_ctrls(cs, helpers, set);
3111 if (ret && set)
3112 cs->error_idx = cs->count;
3113 for (i = 0; !ret && i < cs->count; i++) {
3114 struct v4l2_ctrl *master;
3115 u32 idx = i;
3116
3117 if (helpers[i].mref == NULL)
3118 continue;
3119
3120 cs->error_idx = i;
3121 master = helpers[i].mref->ctrl;
3122 v4l2_ctrl_lock(master);
3123
3124 /* Reset the 'is_new' flags of the cluster */
3125 for (j = 0; j < master->ncontrols; j++)
3126 if (master->cluster[j])
3127 master->cluster[j]->is_new = 0;
3128
3129 /* For volatile autoclusters that are currently in auto mode
3130 we need to discover if it will be set to manual mode.
3131 If so, then we have to copy the current volatile values
3132 first since those will become the new manual values (which
3133 may be overwritten by explicit new values from this set
3134 of controls). */
3135 if (master->is_auto && master->has_volatiles &&
3136 !is_cur_manual(master)) {
3137 /* Pick an initial non-manual value */
3138 s32 new_auto_val = master->manual_mode_value + 1;
3139 u32 tmp_idx = idx;
3140
3141 do {
3142 /* Check if the auto control is part of the
3143 list, and remember the new value. */
3144 if (helpers[tmp_idx].ctrl == master)
3145 new_auto_val = cs->controls[tmp_idx].value;
3146 tmp_idx = helpers[tmp_idx].next;
3147 } while (tmp_idx);
3148 /* If the new value == the manual value, then copy
3149 the current volatile values. */
3150 if (new_auto_val == master->manual_mode_value)
3151 update_from_auto_cluster(master);
3152 }
3153
3154 /* Copy the new caller-supplied control values.
3155 user_to_new() sets 'is_new' to 1. */
3156 do {
3157 struct v4l2_ctrl *ctrl = helpers[idx].ctrl;
3158
3159 ret = user_to_new(cs->controls + idx, ctrl);
3160 if (!ret && ctrl->is_ptr)
3161 ret = validate_new(ctrl, ctrl->p_new);
3162 idx = helpers[idx].next;
3163 } while (!ret && idx);
3164
3165 if (!ret)
3166 ret = try_or_set_cluster(fh, master, set, 0);
3167
3168 /* Copy the new values back to userspace. */
3169 if (!ret) {
3170 idx = i;
3171 do {
3172 ret = new_to_user(cs->controls + idx,
3173 helpers[idx].ctrl);
3174 idx = helpers[idx].next;
3175 } while (!ret && idx);
3176 }
3177 v4l2_ctrl_unlock(master);
3178 }
3179
3180 if (cs->count > ARRAY_SIZE(helper))
3181 kvfree(helpers);
3182 return ret;
3183 }
3184
3185 int v4l2_try_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *cs)
3186 {
3187 return try_set_ext_ctrls(NULL, hdl, cs, false);
3188 }
3189 EXPORT_SYMBOL(v4l2_try_ext_ctrls);
3190
3191 int v4l2_s_ext_ctrls(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
3192 struct v4l2_ext_controls *cs)
3193 {
3194 return try_set_ext_ctrls(fh, hdl, cs, true);
3195 }
3196 EXPORT_SYMBOL(v4l2_s_ext_ctrls);
3197
3198 /* Helper function for VIDIOC_S_CTRL compatibility */
3199 static int set_ctrl(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, u32 ch_flags)
3200 {
3201 struct v4l2_ctrl *master = ctrl->cluster[0];
3202 int ret;
3203 int i;
3204
3205 /* Reset the 'is_new' flags of the cluster */
3206 for (i = 0; i < master->ncontrols; i++)
3207 if (master->cluster[i])
3208 master->cluster[i]->is_new = 0;
3209
3210 ret = validate_new(ctrl, ctrl->p_new);
3211 if (ret)
3212 return ret;
3213
3214 /* For autoclusters with volatiles that are switched from auto to
3215 manual mode we have to update the current volatile values since
3216 those will become the initial manual values after such a switch. */
3217 if (master->is_auto && master->has_volatiles && ctrl == master &&
3218 !is_cur_manual(master) && ctrl->val == master->manual_mode_value)
3219 update_from_auto_cluster(master);
3220
3221 ctrl->is_new = 1;
3222 return try_or_set_cluster(fh, master, true, ch_flags);
3223 }
3224
3225 /* Helper function for VIDIOC_S_CTRL compatibility */
3226 static int set_ctrl_lock(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl,
3227 struct v4l2_ext_control *c)
3228 {
3229 int ret;
3230
3231 v4l2_ctrl_lock(ctrl);
3232 user_to_new(c, ctrl);
3233 ret = set_ctrl(fh, ctrl, 0);
3234 if (!ret)
3235 cur_to_user(c, ctrl);
3236 v4l2_ctrl_unlock(ctrl);
3237 return ret;
3238 }
3239
3240 int v4l2_s_ctrl(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
3241 struct v4l2_control *control)
3242 {
3243 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, control->id);
3244 struct v4l2_ext_control c = { control->id };
3245 int ret;
3246
3247 if (ctrl == NULL || !ctrl->is_int)
3248 return -EINVAL;
3249
3250 if (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY)
3251 return -EACCES;
3252
3253 c.value = control->value;
3254 ret = set_ctrl_lock(fh, ctrl, &c);
3255 control->value = c.value;
3256 return ret;
3257 }
3258 EXPORT_SYMBOL(v4l2_s_ctrl);
3259
3260 int __v4l2_ctrl_s_ctrl(struct v4l2_ctrl *ctrl, s32 val)
3261 {
3262 lockdep_assert_held(ctrl->handler->lock);
3263
3264 /* It's a driver bug if this happens. */
3265 WARN_ON(!ctrl->is_int);
3266 ctrl->val = val;
3267 return set_ctrl(NULL, ctrl, 0);
3268 }
3269 EXPORT_SYMBOL(__v4l2_ctrl_s_ctrl);
3270
3271 int __v4l2_ctrl_s_ctrl_int64(struct v4l2_ctrl *ctrl, s64 val)
3272 {
3273 lockdep_assert_held(ctrl->handler->lock);
3274
3275 /* It's a driver bug if this happens. */
3276 WARN_ON(ctrl->is_ptr || ctrl->type != V4L2_CTRL_TYPE_INTEGER64);
3277 *ctrl->p_new.p_s64 = val;
3278 return set_ctrl(NULL, ctrl, 0);
3279 }
3280 EXPORT_SYMBOL(__v4l2_ctrl_s_ctrl_int64);
3281
3282 int __v4l2_ctrl_s_ctrl_string(struct v4l2_ctrl *ctrl, const char *s)
3283 {
3284 lockdep_assert_held(ctrl->handler->lock);
3285
3286 /* It's a driver bug if this happens. */
3287 WARN_ON(ctrl->type != V4L2_CTRL_TYPE_STRING);
3288 strlcpy(ctrl->p_new.p_char, s, ctrl->maximum + 1);
3289 return set_ctrl(NULL, ctrl, 0);
3290 }
3291 EXPORT_SYMBOL(__v4l2_ctrl_s_ctrl_string);
3292
3293 void v4l2_ctrl_notify(struct v4l2_ctrl *ctrl, v4l2_ctrl_notify_fnc notify, void *priv)
3294 {
3295 if (ctrl == NULL)
3296 return;
3297 if (notify == NULL) {
3298 ctrl->call_notify = 0;
3299 return;
3300 }
3301 if (WARN_ON(ctrl->handler->notify && ctrl->handler->notify != notify))
3302 return;
3303 ctrl->handler->notify = notify;
3304 ctrl->handler->notify_priv = priv;
3305 ctrl->call_notify = 1;
3306 }
3307 EXPORT_SYMBOL(v4l2_ctrl_notify);
3308
3309 int __v4l2_ctrl_modify_range(struct v4l2_ctrl *ctrl,
3310 s64 min, s64 max, u64 step, s64 def)
3311 {
3312 bool value_changed;
3313 bool range_changed = false;
3314 int ret;
3315
3316 lockdep_assert_held(ctrl->handler->lock);
3317
3318 switch (ctrl->type) {
3319 case V4L2_CTRL_TYPE_INTEGER:
3320 case V4L2_CTRL_TYPE_INTEGER64:
3321 case V4L2_CTRL_TYPE_BOOLEAN:
3322 case V4L2_CTRL_TYPE_MENU:
3323 case V4L2_CTRL_TYPE_INTEGER_MENU:
3324 case V4L2_CTRL_TYPE_BITMASK:
3325 case V4L2_CTRL_TYPE_U8:
3326 case V4L2_CTRL_TYPE_U16:
3327 case V4L2_CTRL_TYPE_U32:
3328 if (ctrl->is_array)
3329 return -EINVAL;
3330 ret = check_range(ctrl->type, min, max, step, def);
3331 if (ret)
3332 return ret;
3333 break;
3334 default:
3335 return -EINVAL;
3336 }
3337 if ((ctrl->minimum != min) || (ctrl->maximum != max) ||
3338 (ctrl->step != step) || ctrl->default_value != def) {
3339 range_changed = true;
3340 ctrl->minimum = min;
3341 ctrl->maximum = max;
3342 ctrl->step = step;
3343 ctrl->default_value = def;
3344 }
3345 cur_to_new(ctrl);
3346 if (validate_new(ctrl, ctrl->p_new)) {
3347 if (ctrl->type == V4L2_CTRL_TYPE_INTEGER64)
3348 *ctrl->p_new.p_s64 = def;
3349 else
3350 *ctrl->p_new.p_s32 = def;
3351 }
3352
3353 if (ctrl->type == V4L2_CTRL_TYPE_INTEGER64)
3354 value_changed = *ctrl->p_new.p_s64 != *ctrl->p_cur.p_s64;
3355 else
3356 value_changed = *ctrl->p_new.p_s32 != *ctrl->p_cur.p_s32;
3357 if (value_changed)
3358 ret = set_ctrl(NULL, ctrl, V4L2_EVENT_CTRL_CH_RANGE);
3359 else if (range_changed)
3360 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_RANGE);
3361 return ret;
3362 }
3363 EXPORT_SYMBOL(__v4l2_ctrl_modify_range);
3364
3365 static int v4l2_ctrl_add_event(struct v4l2_subscribed_event *sev, unsigned elems)
3366 {
3367 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(sev->fh->ctrl_handler, sev->id);
3368
3369 if (ctrl == NULL)
3370 return -EINVAL;
3371
3372 v4l2_ctrl_lock(ctrl);
3373 list_add_tail(&sev->node, &ctrl->ev_subs);
3374 if (ctrl->type != V4L2_CTRL_TYPE_CTRL_CLASS &&
3375 (sev->flags & V4L2_EVENT_SUB_FL_SEND_INITIAL)) {
3376 struct v4l2_event ev;
3377 u32 changes = V4L2_EVENT_CTRL_CH_FLAGS;
3378
3379 if (!(ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY))
3380 changes |= V4L2_EVENT_CTRL_CH_VALUE;
3381 fill_event(&ev, ctrl, changes);
3382 /* Mark the queue as active, allowing this initial
3383 event to be accepted. */
3384 sev->elems = elems;
3385 v4l2_event_queue_fh(sev->fh, &ev);
3386 }
3387 v4l2_ctrl_unlock(ctrl);
3388 return 0;
3389 }
3390
3391 static void v4l2_ctrl_del_event(struct v4l2_subscribed_event *sev)
3392 {
3393 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(sev->fh->ctrl_handler, sev->id);
3394
3395 if (ctrl == NULL)
3396 return;
3397
3398 v4l2_ctrl_lock(ctrl);
3399 list_del(&sev->node);
3400 v4l2_ctrl_unlock(ctrl);
3401 }
3402
3403 void v4l2_ctrl_replace(struct v4l2_event *old, const struct v4l2_event *new)
3404 {
3405 u32 old_changes = old->u.ctrl.changes;
3406
3407 old->u.ctrl = new->u.ctrl;
3408 old->u.ctrl.changes |= old_changes;
3409 }
3410 EXPORT_SYMBOL(v4l2_ctrl_replace);
3411
3412 void v4l2_ctrl_merge(const struct v4l2_event *old, struct v4l2_event *new)
3413 {
3414 new->u.ctrl.changes |= old->u.ctrl.changes;
3415 }
3416 EXPORT_SYMBOL(v4l2_ctrl_merge);
3417
3418 const struct v4l2_subscribed_event_ops v4l2_ctrl_sub_ev_ops = {
3419 .add = v4l2_ctrl_add_event,
3420 .del = v4l2_ctrl_del_event,
3421 .replace = v4l2_ctrl_replace,
3422 .merge = v4l2_ctrl_merge,
3423 };
3424 EXPORT_SYMBOL(v4l2_ctrl_sub_ev_ops);
3425
3426 int v4l2_ctrl_log_status(struct file *file, void *fh)
3427 {
3428 struct video_device *vfd = video_devdata(file);
3429 struct v4l2_fh *vfh = file->private_data;
3430
3431 if (test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags) && vfd->v4l2_dev)
3432 v4l2_ctrl_handler_log_status(vfh->ctrl_handler,
3433 vfd->v4l2_dev->name);
3434 return 0;
3435 }
3436 EXPORT_SYMBOL(v4l2_ctrl_log_status);
3437
3438 int v4l2_ctrl_subscribe_event(struct v4l2_fh *fh,
3439 const struct v4l2_event_subscription *sub)
3440 {
3441 if (sub->type == V4L2_EVENT_CTRL)
3442 return v4l2_event_subscribe(fh, sub, 0, &v4l2_ctrl_sub_ev_ops);
3443 return -EINVAL;
3444 }
3445 EXPORT_SYMBOL(v4l2_ctrl_subscribe_event);
3446
3447 int v4l2_ctrl_subdev_subscribe_event(struct v4l2_subdev *sd, struct v4l2_fh *fh,
3448 struct v4l2_event_subscription *sub)
3449 {
3450 if (!sd->ctrl_handler)
3451 return -EINVAL;
3452 return v4l2_ctrl_subscribe_event(fh, sub);
3453 }
3454 EXPORT_SYMBOL(v4l2_ctrl_subdev_subscribe_event);
3455
3456 unsigned int v4l2_ctrl_poll(struct file *file, struct poll_table_struct *wait)
3457 {
3458 struct v4l2_fh *fh = file->private_data;
3459
3460 if (v4l2_event_pending(fh))
3461 return POLLPRI;
3462 poll_wait(file, &fh->wait, wait);
3463 return 0;
3464 }
3465 EXPORT_SYMBOL(v4l2_ctrl_poll);
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