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[media] media: v4l2-ctrls: add control for test pattern
[linux-block.git] / drivers / media / v4l2-core / v4l2-ctrls.c
CommitLineData
0996517c
HV		 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>
2b80163c 22#include <linux/slab.h>
35a24636 23#include <linux/export.h>
0996517c
HV		 24#include <media/v4l2-ioctl.h>
25#include <media/v4l2-device.h>
26#include <media/v4l2-ctrls.h>
6e239399 27#include <media/v4l2-event.h>
0996517c
HV		 28#include <media/v4l2-dev.h>
29
ddac5c10
HV		 30#define has_op(master, op) \
31 (master->ops && master->ops->op)
54c911eb 32#define call_op(master, op) \
ddac5c10 33 (has_op(master, op) ? master->ops->op(master) : 0)
54c911eb 34
0996517c 35/* Internal temporary helper struct, one for each v4l2_ext_control */
eb5b16ef
HV		 36struct v4l2_ctrl_helper {
37 /* Pointer to the control reference of the master control */
38 struct v4l2_ctrl_ref *mref;
0996517c
HV		 39 /* The control corresponding to the v4l2_ext_control ID field. */
40 struct v4l2_ctrl *ctrl;
eb5b16ef
HV		 41 /* v4l2_ext_control index of the next control belonging to the
42 same cluster, or 0 if there isn't any. */
43 u32 next;
0996517c
HV		 44};
45
72d877ca 46/* Small helper function to determine if the autocluster is set to manual
88365105 47 mode. */
72d877ca
HV		 48static bool is_cur_manual(const struct v4l2_ctrl *master)
49{
50 return master->is_auto && master->cur.val == master->manual_mode_value;
51}
52
53/* Same as above, but this checks the against the new value instead of the
54 current value. */
55static bool is_new_manual(const struct v4l2_ctrl *master)
56{
57 return master->is_auto && master->val == master->manual_mode_value;
58}
59
0996517c
HV		 60/* Returns NULL or a character pointer array containing the menu for
61 the given control ID. The pointer array ends with a NULL pointer.
62 An empty string signifies a menu entry that is invalid. This allows
63 drivers to disable certain options if it is not supported. */
513521ea 64const char * const *v4l2_ctrl_get_menu(u32 id)
0996517c 65{
513521ea 66 static const char * const mpeg_audio_sampling_freq[] = {
0996517c
HV		 67 "44.1 kHz",
68 "48 kHz",
69 "32 kHz",
70 NULL
71 };
513521ea 72 static const char * const mpeg_audio_encoding[] = {
0996517c
HV		 73 "MPEG-1/2 Layer I",
74 "MPEG-1/2 Layer II",
75 "MPEG-1/2 Layer III",
76 "MPEG-2/4 AAC",
77 "AC-3",
78 NULL
79 };
513521ea 80 static const char * const mpeg_audio_l1_bitrate[] = {
0996517c
HV		 81 "32 kbps",
82 "64 kbps",
83 "96 kbps",
84 "128 kbps",
85 "160 kbps",
86 "192 kbps",
87 "224 kbps",
88 "256 kbps",
89 "288 kbps",
90 "320 kbps",
91 "352 kbps",
92 "384 kbps",
93 "416 kbps",
94 "448 kbps",
95 NULL
96 };
513521ea 97 static const char * const mpeg_audio_l2_bitrate[] = {
0996517c
HV		 98 "32 kbps",
99 "48 kbps",
100 "56 kbps",
101 "64 kbps",
102 "80 kbps",
103 "96 kbps",
104 "112 kbps",
105 "128 kbps",
106 "160 kbps",
107 "192 kbps",
108 "224 kbps",
109 "256 kbps",
110 "320 kbps",
111 "384 kbps",
112 NULL
113 };
513521ea 114 static const char * const mpeg_audio_l3_bitrate[] = {
0996517c
HV		 115 "32 kbps",
116 "40 kbps",
117 "48 kbps",
118 "56 kbps",
119 "64 kbps",
120 "80 kbps",
121 "96 kbps",
122 "112 kbps",
123 "128 kbps",
124 "160 kbps",
125 "192 kbps",
126 "224 kbps",
127 "256 kbps",
128 "320 kbps",
129 NULL
130 };
513521ea 131 static const char * const mpeg_audio_ac3_bitrate[] = {
0996517c
HV		 132 "32 kbps",
133 "40 kbps",
134 "48 kbps",
135 "56 kbps",
136 "64 kbps",
137 "80 kbps",
138 "96 kbps",
139 "112 kbps",
140 "128 kbps",
141 "160 kbps",
142 "192 kbps",
143 "224 kbps",
144 "256 kbps",
145 "320 kbps",
146 "384 kbps",
147 "448 kbps",
148 "512 kbps",
149 "576 kbps",
150 "640 kbps",
151 NULL
152 };
513521ea 153 static const char * const mpeg_audio_mode[] = {
0996517c
HV		 154 "Stereo",
155 "Joint Stereo",
156 "Dual",
157 "Mono",
158 NULL
159 };
513521ea 160 static const char * const mpeg_audio_mode_extension[] = {
0996517c
HV		 161 "Bound 4",
162 "Bound 8",
163 "Bound 12",
164 "Bound 16",
165 NULL
166 };
513521ea 167 static const char * const mpeg_audio_emphasis[] = {
0996517c
HV		 168 "No Emphasis",
169 "50/15 us",
170 "CCITT J17",
171 NULL
172 };
513521ea 173 static const char * const mpeg_audio_crc[] = {
0996517c
HV		 174 "No CRC",
175 "16-bit CRC",
176 NULL
177 };
24c19a21
HV		 178 static const char * const mpeg_audio_dec_playback[] = {
179 "Auto",
180 "Stereo",
181 "Left",
182 "Right",
183 "Mono",
184 "Swapped Stereo",
185 NULL
186 };
513521ea 187 static const char * const mpeg_video_encoding[] = {
0996517c
HV		 188 "MPEG-1",
189 "MPEG-2",
190 "MPEG-4 AVC",
191 NULL
192 };
513521ea 193 static const char * const mpeg_video_aspect[] = {
0996517c
HV		 194 "1x1",
195 "4x3",
196 "16x9",
197 "2.21x1",
198 NULL
199 };
513521ea 200 static const char * const mpeg_video_bitrate_mode[] = {
0996517c
HV		 201 "Variable Bitrate",
202 "Constant Bitrate",
203 NULL
204 };
513521ea 205 static const char * const mpeg_stream_type[] = {
0996517c
HV		 206 "MPEG-2 Program Stream",
207 "MPEG-2 Transport Stream",
208 "MPEG-1 System Stream",
209 "MPEG-2 DVD-compatible Stream",
210 "MPEG-1 VCD-compatible Stream",
211 "MPEG-2 SVCD-compatible Stream",
212 NULL
213 };
513521ea 214 static const char * const mpeg_stream_vbi_fmt[] = {
0996517c 215 "No VBI",
064f5096 216 "Private Packet, IVTV Format",
0996517c
HV		 217 NULL
218 };
513521ea 219 static const char * const camera_power_line_frequency[] = {
0996517c
HV		 220 "Disabled",
221 "50 Hz",
222 "60 Hz",
d26a6635 223 "Auto",
0996517c
HV		 224 NULL
225 };
513521ea 226 static const char * const camera_exposure_auto[] = {
0996517c
HV		 227 "Auto Mode",
228 "Manual Mode",
229 "Shutter Priority Mode",
230 "Aperture Priority Mode",
231 NULL
232 };
cf072139
SN		 233 static const char * const camera_exposure_metering[] = {
234 "Average",
235 "Center Weighted",
236 "Spot",
237 NULL
238 };
2272ab65
SN		 239 static const char * const camera_auto_focus_range[] = {
240 "Auto",
241 "Normal",
242 "Macro",
243 "Infinity",
244 NULL
245 };
513521ea 246 static const char * const colorfx[] = {
0996517c
HV		 247 "None",
248 "Black & White",
249 "Sepia",
250 "Negative",
251 "Emboss",
252 "Sketch",
064f5096
KD		 253 "Sky Blue",
254 "Grass Green",
255 "Skin Whiten",
0996517c 256 "Vivid",
6491d1ad
SN		 257 "Aqua",
258 "Art Freeze",
259 "Silhouette",
260 "Solarization",
261 "Antique",
262 "Set Cb/Cr",
0996517c
HV		 263 NULL
264 };
e40a0573
SN		 265 static const char * const auto_n_preset_white_balance[] = {
266 "Manual",
267 "Auto",
268 "Incandescent",
269 "Fluorescent",
270 "Fluorescent H",
271 "Horizon",
272 "Daylight",
273 "Flash",
274 "Cloudy",
275 "Shade",
276 NULL,
277 };
7f84ad8b
SN		 278 static const char * const camera_iso_sensitivity_auto[] = {
279 "Manual",
280 "Auto",
281 NULL
282 };
0bf6b7dc
SN		 283 static const char * const scene_mode[] = {
284 "None",
285 "Backlight",
286 "Beach/Snow",
287 "Candle Light",
288 "Dusk/Dawn",
289 "Fall Colors",
290 "Fireworks",
291 "Landscape",
292 "Night",
293 "Party/Indoor",
294 "Portrait",
295 "Sports",
296 "Sunset",
297 "Text",
298 NULL
299 };
513521ea 300 static const char * const tune_preemphasis[] = {
064f5096 301 "No Preemphasis",
f769c260
HV		 302 "50 Microseconds",
303 "75 Microseconds",
0996517c
HV		 304 NULL,
305 };
064f5096
KD		 306 static const char * const header_mode[] = {
307 "Separate Buffer",
308 "Joined With 1st Frame",
309 NULL,
310 };
311 static const char * const multi_slice[] = {
312 "Single",
313 "Max Macroblocks",
314 "Max Bytes",
315 NULL,
316 };
317 static const char * const entropy_mode[] = {
318 "CAVLC",
319 "CABAC",
320 NULL,
321 };
322 static const char * const mpeg_h264_level[] = {
323 "1",
324 "1b",
325 "1.1",
326 "1.2",
327 "1.3",
328 "2",
329 "2.1",
330 "2.2",
331 "3",
332 "3.1",
333 "3.2",
334 "4",
335 "4.1",
336 "4.2",
337 "5",
338 "5.1",
339 NULL,
340 };
341 static const char * const h264_loop_filter[] = {
342 "Enabled",
343 "Disabled",
344 "Disabled at Slice Boundary",
345 NULL,
346 };
347 static const char * const h264_profile[] = {
348 "Baseline",
349 "Constrained Baseline",
350 "Main",
351 "Extended",
352 "High",
353 "High 10",
354 "High 422",
355 "High 444 Predictive",
356 "High 10 Intra",
357 "High 422 Intra",
358 "High 444 Intra",
359 "CAVLC 444 Intra",
360 "Scalable Baseline",
361 "Scalable High",
362 "Scalable High Intra",
363 "Multiview High",
364 NULL,
365 };
366 static const char * const vui_sar_idc[] = {
367 "Unspecified",
368 "1:1",
369 "12:11",
370 "10:11",
371 "16:11",
372 "40:33",
373 "24:11",
374 "20:11",
375 "32:11",
376 "80:33",
377 "18:11",
378 "15:11",
379 "64:33",
380 "160:99",
381 "4:3",
382 "3:2",
383 "2:1",
384 "Extended SAR",
385 NULL,
386 };
387 static const char * const mpeg_mpeg4_level[] = {
388 "0",
389 "0b",
390 "1",
391 "2",
392 "3",
393 "3b",
394 "4",
395 "5",
396 NULL,
397 };
398 static const char * const mpeg4_profile[] = {
399 "Simple",
f769c260 400 "Advanced Simple",
064f5096
KD		 401 "Core",
402 "Simple Scalable",
403 "Advanced Coding Efficency",
404 NULL,
405 };
406
0b159acd
SA		 407 static const char * const flash_led_mode[] = {
408 "Off",
409 "Flash",
410 "Torch",
411 NULL,
412 };
413 static const char * const flash_strobe_source[] = {
414 "Software",
415 "External",
416 NULL,
417 };
0996517c 418
c7361ae1
SN		 419 static const char * const jpeg_chroma_subsampling[] = {
420 "4:4:4",
421 "4:2:2",
422 "4:2:0",
423 "4:1:1",
424 "4:1:0",
425 "Gray",
426 NULL,
427 };
977ebec7
HV		 428 static const char * const dv_tx_mode[] = {
429 "DVI-D",
430 "HDMI",
431 NULL,
432 };
433 static const char * const dv_rgb_range[] = {
434 "Automatic",
435 "RGB limited range (16-235)",
436 "RGB full range (0-255)",
437 NULL,
438 };
439
c7361ae1 440
0996517c
HV		 441 switch (id) {
442 case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ:
443 return mpeg_audio_sampling_freq;
444 case V4L2_CID_MPEG_AUDIO_ENCODING:
445 return mpeg_audio_encoding;
446 case V4L2_CID_MPEG_AUDIO_L1_BITRATE:
447 return mpeg_audio_l1_bitrate;
448 case V4L2_CID_MPEG_AUDIO_L2_BITRATE:
449 return mpeg_audio_l2_bitrate;
450 case V4L2_CID_MPEG_AUDIO_L3_BITRATE:
451 return mpeg_audio_l3_bitrate;
452 case V4L2_CID_MPEG_AUDIO_AC3_BITRATE:
453 return mpeg_audio_ac3_bitrate;
454 case V4L2_CID_MPEG_AUDIO_MODE:
455 return mpeg_audio_mode;
456 case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION:
457 return mpeg_audio_mode_extension;
458 case V4L2_CID_MPEG_AUDIO_EMPHASIS:
459 return mpeg_audio_emphasis;
460 case V4L2_CID_MPEG_AUDIO_CRC:
461 return mpeg_audio_crc;
24c19a21
HV		 462 case V4L2_CID_MPEG_AUDIO_DEC_PLAYBACK:
463 case V4L2_CID_MPEG_AUDIO_DEC_MULTILINGUAL_PLAYBACK:
464 return mpeg_audio_dec_playback;
0996517c
HV		 465 case V4L2_CID_MPEG_VIDEO_ENCODING:
466 return mpeg_video_encoding;
467 case V4L2_CID_MPEG_VIDEO_ASPECT:
468 return mpeg_video_aspect;
469 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
470 return mpeg_video_bitrate_mode;
471 case V4L2_CID_MPEG_STREAM_TYPE:
472 return mpeg_stream_type;
473 case V4L2_CID_MPEG_STREAM_VBI_FMT:
474 return mpeg_stream_vbi_fmt;
475 case V4L2_CID_POWER_LINE_FREQUENCY:
476 return camera_power_line_frequency;
477 case V4L2_CID_EXPOSURE_AUTO:
478 return camera_exposure_auto;
cf072139
SN		 479 case V4L2_CID_EXPOSURE_METERING:
480 return camera_exposure_metering;
2272ab65
SN		 481 case V4L2_CID_AUTO_FOCUS_RANGE:
482 return camera_auto_focus_range;
0996517c
HV		 483 case V4L2_CID_COLORFX:
484 return colorfx;
e40a0573
SN		 485 case V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE:
486 return auto_n_preset_white_balance;
7f84ad8b
SN		 487 case V4L2_CID_ISO_SENSITIVITY_AUTO:
488 return camera_iso_sensitivity_auto;
0bf6b7dc
SN		 489 case V4L2_CID_SCENE_MODE:
490 return scene_mode;
0996517c
HV		 491 case V4L2_CID_TUNE_PREEMPHASIS:
492 return tune_preemphasis;
0b159acd
SA		 493 case V4L2_CID_FLASH_LED_MODE:
494 return flash_led_mode;
495 case V4L2_CID_FLASH_STROBE_SOURCE:
496 return flash_strobe_source;
064f5096
KD		 497 case V4L2_CID_MPEG_VIDEO_HEADER_MODE:
498 return header_mode;
499 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE:
500 return multi_slice;
501 case V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE:
502 return entropy_mode;
503 case V4L2_CID_MPEG_VIDEO_H264_LEVEL:
504 return mpeg_h264_level;
505 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE:
506 return h264_loop_filter;
507 case V4L2_CID_MPEG_VIDEO_H264_PROFILE:
508 return h264_profile;
509 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC:
510 return vui_sar_idc;
511 case V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL:
512 return mpeg_mpeg4_level;
513 case V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE:
514 return mpeg4_profile;
c7361ae1
SN		 515 case V4L2_CID_JPEG_CHROMA_SUBSAMPLING:
516 return jpeg_chroma_subsampling;
977ebec7
HV		 517 case V4L2_CID_DV_TX_MODE:
518 return dv_tx_mode;
519 case V4L2_CID_DV_TX_RGB_RANGE:
520 case V4L2_CID_DV_RX_RGB_RANGE:
521 return dv_rgb_range;
c7361ae1 522
0996517c
HV		 523 default:
524 return NULL;
525 }
526}
527EXPORT_SYMBOL(v4l2_ctrl_get_menu);
528
529/* Return the control name. */
530const char *v4l2_ctrl_get_name(u32 id)
531{
532 switch (id) {
533 /* USER controls */
6c8d6111 534 /* Keep the order of the 'case's the same as in videodev2.h! */
6dd5aff3
MCC		 535 case V4L2_CID_USER_CLASS: return "User Controls";
536 case V4L2_CID_BRIGHTNESS: return "Brightness";
537 case V4L2_CID_CONTRAST: return "Contrast";
538 case V4L2_CID_SATURATION: return "Saturation";
539 case V4L2_CID_HUE: return "Hue";
540 case V4L2_CID_AUDIO_VOLUME: return "Volume";
541 case V4L2_CID_AUDIO_BALANCE: return "Balance";
542 case V4L2_CID_AUDIO_BASS: return "Bass";
543 case V4L2_CID_AUDIO_TREBLE: return "Treble";
544 case V4L2_CID_AUDIO_MUTE: return "Mute";
545 case V4L2_CID_AUDIO_LOUDNESS: return "Loudness";
0996517c
HV		 546 case V4L2_CID_BLACK_LEVEL: return "Black Level";
547 case V4L2_CID_AUTO_WHITE_BALANCE: return "White Balance, Automatic";
548 case V4L2_CID_DO_WHITE_BALANCE: return "Do White Balance";
549 case V4L2_CID_RED_BALANCE: return "Red Balance";
550 case V4L2_CID_BLUE_BALANCE: return "Blue Balance";
551 case V4L2_CID_GAMMA: return "Gamma";
552 case V4L2_CID_EXPOSURE: return "Exposure";
553 case V4L2_CID_AUTOGAIN: return "Gain, Automatic";
554 case V4L2_CID_GAIN: return "Gain";
555 case V4L2_CID_HFLIP: return "Horizontal Flip";
556 case V4L2_CID_VFLIP: return "Vertical Flip";
557 case V4L2_CID_HCENTER: return "Horizontal Center";
558 case V4L2_CID_VCENTER: return "Vertical Center";
559 case V4L2_CID_POWER_LINE_FREQUENCY: return "Power Line Frequency";
560 case V4L2_CID_HUE_AUTO: return "Hue, Automatic";
561 case V4L2_CID_WHITE_BALANCE_TEMPERATURE: return "White Balance Temperature";
562 case V4L2_CID_SHARPNESS: return "Sharpness";
563 case V4L2_CID_BACKLIGHT_COMPENSATION: return "Backlight Compensation";
564 case V4L2_CID_CHROMA_AGC: return "Chroma AGC";
0996517c
HV		 565 case V4L2_CID_COLOR_KILLER: return "Color Killer";
566 case V4L2_CID_COLORFX: return "Color Effects";
567 case V4L2_CID_AUTOBRIGHTNESS: return "Brightness, Automatic";
568 case V4L2_CID_BAND_STOP_FILTER: return "Band-Stop Filter";
569 case V4L2_CID_ROTATE: return "Rotate";
570 case V4L2_CID_BG_COLOR: return "Background Color";
6c8d6111 571 case V4L2_CID_CHROMA_GAIN: return "Chroma Gain";
008d35f2
JFM		 572 case V4L2_CID_ILLUMINATORS_1: return "Illuminator 1";
573 case V4L2_CID_ILLUMINATORS_2: return "Illuminator 2";
f08aacf8
HV		 574 case V4L2_CID_MIN_BUFFERS_FOR_CAPTURE: return "Min Number of Capture Buffers";
575 case V4L2_CID_MIN_BUFFERS_FOR_OUTPUT: return "Min Number of Output Buffers";
cc1d3272 576 case V4L2_CID_ALPHA_COMPONENT: return "Alpha Component";
6491d1ad 577 case V4L2_CID_COLORFX_CBCR: return "Color Effects, CbCr";
0996517c
HV		 578
579 /* MPEG controls */
6c8d6111 580 /* Keep the order of the 'case's the same as in videodev2.h! */
6dd5aff3
MCC		 581 case V4L2_CID_MPEG_CLASS: return "MPEG Encoder Controls";
582 case V4L2_CID_MPEG_STREAM_TYPE: return "Stream Type";
583 case V4L2_CID_MPEG_STREAM_PID_PMT: return "Stream PMT Program ID";
584 case V4L2_CID_MPEG_STREAM_PID_AUDIO: return "Stream Audio Program ID";
585 case V4L2_CID_MPEG_STREAM_PID_VIDEO: return "Stream Video Program ID";
586 case V4L2_CID_MPEG_STREAM_PID_PCR: return "Stream PCR Program ID";
6c8d6111
HV		 587 case V4L2_CID_MPEG_STREAM_PES_ID_AUDIO: return "Stream PES Audio ID";
588 case V4L2_CID_MPEG_STREAM_PES_ID_VIDEO: return "Stream PES Video ID";
589 case V4L2_CID_MPEG_STREAM_VBI_FMT: return "Stream VBI Format";
0996517c 590 case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ: return "Audio Sampling Frequency";
6dd5aff3
MCC		 591 case V4L2_CID_MPEG_AUDIO_ENCODING: return "Audio Encoding";
592 case V4L2_CID_MPEG_AUDIO_L1_BITRATE: return "Audio Layer I Bitrate";
593 case V4L2_CID_MPEG_AUDIO_L2_BITRATE: return "Audio Layer II Bitrate";
594 case V4L2_CID_MPEG_AUDIO_L3_BITRATE: return "Audio Layer III Bitrate";
595 case V4L2_CID_MPEG_AUDIO_MODE: return "Audio Stereo Mode";
0996517c 596 case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION: return "Audio Stereo Mode Extension";
6dd5aff3
MCC		 597 case V4L2_CID_MPEG_AUDIO_EMPHASIS: return "Audio Emphasis";
598 case V4L2_CID_MPEG_AUDIO_CRC: return "Audio CRC";
599 case V4L2_CID_MPEG_AUDIO_MUTE: return "Audio Mute";
600 case V4L2_CID_MPEG_AUDIO_AAC_BITRATE: return "Audio AAC Bitrate";
601 case V4L2_CID_MPEG_AUDIO_AC3_BITRATE: return "Audio AC-3 Bitrate";
24c19a21
HV		 602 case V4L2_CID_MPEG_AUDIO_DEC_PLAYBACK: return "Audio Playback";
603 case V4L2_CID_MPEG_AUDIO_DEC_MULTILINGUAL_PLAYBACK: return "Audio Multilingual Playback";
6dd5aff3
MCC		 604 case V4L2_CID_MPEG_VIDEO_ENCODING: return "Video Encoding";
605 case V4L2_CID_MPEG_VIDEO_ASPECT: return "Video Aspect";
606 case V4L2_CID_MPEG_VIDEO_B_FRAMES: return "Video B Frames";
607 case V4L2_CID_MPEG_VIDEO_GOP_SIZE: return "Video GOP Size";
608 case V4L2_CID_MPEG_VIDEO_GOP_CLOSURE: return "Video GOP Closure";
609 case V4L2_CID_MPEG_VIDEO_PULLDOWN: return "Video Pulldown";
610 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE: return "Video Bitrate Mode";
611 case V4L2_CID_MPEG_VIDEO_BITRATE: return "Video Bitrate";
612 case V4L2_CID_MPEG_VIDEO_BITRATE_PEAK: return "Video Peak Bitrate";
0996517c 613 case V4L2_CID_MPEG_VIDEO_TEMPORAL_DECIMATION: return "Video Temporal Decimation";
6dd5aff3 614 case V4L2_CID_MPEG_VIDEO_MUTE: return "Video Mute";
0996517c 615 case V4L2_CID_MPEG_VIDEO_MUTE_YUV: return "Video Mute YUV";
064f5096
KD		 616 case V4L2_CID_MPEG_VIDEO_DECODER_SLICE_INTERFACE: return "Decoder Slice Interface";
617 case V4L2_CID_MPEG_VIDEO_DECODER_MPEG4_DEBLOCK_FILTER: return "MPEG4 Loop Filter Enable";
f08aacf8 618 case V4L2_CID_MPEG_VIDEO_CYCLIC_INTRA_REFRESH_MB: return "Number of Intra Refresh MBs";
064f5096
KD		 619 case V4L2_CID_MPEG_VIDEO_FRAME_RC_ENABLE: return "Frame Level Rate Control Enable";
620 case V4L2_CID_MPEG_VIDEO_MB_RC_ENABLE: return "H264 MB Level Rate Control";
621 case V4L2_CID_MPEG_VIDEO_HEADER_MODE: return "Sequence Header Mode";
f08aacf8 622 case V4L2_CID_MPEG_VIDEO_MAX_REF_PIC: return "Max Number of Reference Pics";
064f5096 623 case V4L2_CID_MPEG_VIDEO_H263_I_FRAME_QP: return "H263 I-Frame QP Value";
f08aacf8
HV		 624 case V4L2_CID_MPEG_VIDEO_H263_P_FRAME_QP: return "H263 P-Frame QP Value";
625 case V4L2_CID_MPEG_VIDEO_H263_B_FRAME_QP: return "H263 B-Frame QP Value";
064f5096
KD		 626 case V4L2_CID_MPEG_VIDEO_H263_MIN_QP: return "H263 Minimum QP Value";
627 case V4L2_CID_MPEG_VIDEO_H263_MAX_QP: return "H263 Maximum QP Value";
628 case V4L2_CID_MPEG_VIDEO_H264_I_FRAME_QP: return "H264 I-Frame QP Value";
f08aacf8
HV		 629 case V4L2_CID_MPEG_VIDEO_H264_P_FRAME_QP: return "H264 P-Frame QP Value";
630 case V4L2_CID_MPEG_VIDEO_H264_B_FRAME_QP: return "H264 B-Frame QP Value";
064f5096
KD		 631 case V4L2_CID_MPEG_VIDEO_H264_MAX_QP: return "H264 Maximum QP Value";
632 case V4L2_CID_MPEG_VIDEO_H264_MIN_QP: return "H264 Minimum QP Value";
633 case V4L2_CID_MPEG_VIDEO_H264_8X8_TRANSFORM: return "H264 8x8 Transform Enable";
634 case V4L2_CID_MPEG_VIDEO_H264_CPB_SIZE: return "H264 CPB Buffer Size";
f08aacf8
HV		 635 case V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE: return "H264 Entropy Mode";
636 case V4L2_CID_MPEG_VIDEO_H264_I_PERIOD: return "H264 I-Frame Period";
064f5096
KD		 637 case V4L2_CID_MPEG_VIDEO_H264_LEVEL: return "H264 Level";
638 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_ALPHA: return "H264 Loop Filter Alpha Offset";
639 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_BETA: return "H264 Loop Filter Beta Offset";
640 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE: return "H264 Loop Filter Mode";
641 case V4L2_CID_MPEG_VIDEO_H264_PROFILE: return "H264 Profile";
642 case V4L2_CID_MPEG_VIDEO_H264_VUI_EXT_SAR_HEIGHT: return "Vertical Size of SAR";
643 case V4L2_CID_MPEG_VIDEO_H264_VUI_EXT_SAR_WIDTH: return "Horizontal Size of SAR";
644 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_ENABLE: return "Aspect Ratio VUI Enable";
645 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC: return "VUI Aspect Ratio IDC";
646 case V4L2_CID_MPEG_VIDEO_MPEG4_I_FRAME_QP: return "MPEG4 I-Frame QP Value";
f08aacf8
HV		 647 case V4L2_CID_MPEG_VIDEO_MPEG4_P_FRAME_QP: return "MPEG4 P-Frame QP Value";
648 case V4L2_CID_MPEG_VIDEO_MPEG4_B_FRAME_QP: return "MPEG4 B-Frame QP Value";
064f5096
KD		 649 case V4L2_CID_MPEG_VIDEO_MPEG4_MIN_QP: return "MPEG4 Minimum QP Value";
650 case V4L2_CID_MPEG_VIDEO_MPEG4_MAX_QP: return "MPEG4 Maximum QP Value";
651 case V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL: return "MPEG4 Level";
652 case V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE: return "MPEG4 Profile";
653 case V4L2_CID_MPEG_VIDEO_MPEG4_QPEL: return "Quarter Pixel Search Enable";
f08aacf8
HV		 654 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MAX_BYTES: return "Maximum Bytes in a Slice";
655 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MAX_MB: return "Number of MBs in a Slice";
656 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE: return "Slice Partitioning Method";
064f5096 657 case V4L2_CID_MPEG_VIDEO_VBV_SIZE: return "VBV Buffer Size";
24c19a21
HV		 658 case V4L2_CID_MPEG_VIDEO_DEC_PTS: return "Video Decoder PTS";
659 case V4L2_CID_MPEG_VIDEO_DEC_FRAME: return "Video Decoder Frame Count";
0996517c
HV		 660
661 /* CAMERA controls */
6c8d6111 662 /* Keep the order of the 'case's the same as in videodev2.h! */
0996517c
HV		 663 case V4L2_CID_CAMERA_CLASS: return "Camera Controls";
664 case V4L2_CID_EXPOSURE_AUTO: return "Auto Exposure";
665 case V4L2_CID_EXPOSURE_ABSOLUTE: return "Exposure Time, Absolute";
666 case V4L2_CID_EXPOSURE_AUTO_PRIORITY: return "Exposure, Dynamic Framerate";
667 case V4L2_CID_PAN_RELATIVE: return "Pan, Relative";
668 case V4L2_CID_TILT_RELATIVE: return "Tilt, Relative";
669 case V4L2_CID_PAN_RESET: return "Pan, Reset";
670 case V4L2_CID_TILT_RESET: return "Tilt, Reset";
671 case V4L2_CID_PAN_ABSOLUTE: return "Pan, Absolute";
672 case V4L2_CID_TILT_ABSOLUTE: return "Tilt, Absolute";
673 case V4L2_CID_FOCUS_ABSOLUTE: return "Focus, Absolute";
674 case V4L2_CID_FOCUS_RELATIVE: return "Focus, Relative";
2272ab65 675 case V4L2_CID_FOCUS_AUTO: return "Focus, Automatic Continuous";
0996517c
HV		 676 case V4L2_CID_ZOOM_ABSOLUTE: return "Zoom, Absolute";
677 case V4L2_CID_ZOOM_RELATIVE: return "Zoom, Relative";
678 case V4L2_CID_ZOOM_CONTINUOUS: return "Zoom, Continuous";
679 case V4L2_CID_PRIVACY: return "Privacy";
6c8d6111
HV		 680 case V4L2_CID_IRIS_ABSOLUTE: return "Iris, Absolute";
681 case V4L2_CID_IRIS_RELATIVE: return "Iris, Relative";
d58083c9 682 case V4L2_CID_AUTO_EXPOSURE_BIAS: return "Auto Exposure, Bias";
e40a0573 683 case V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE: return "White Balance, Auto & Preset";
44d44a1a 684 case V4L2_CID_WIDE_DYNAMIC_RANGE: return "Wide Dynamic Range";
82b3056c 685 case V4L2_CID_IMAGE_STABILIZATION: return "Image Stabilization";
7f84ad8b
SN		 686 case V4L2_CID_ISO_SENSITIVITY: return "ISO Sensitivity";
687 case V4L2_CID_ISO_SENSITIVITY_AUTO: return "ISO Sensitivity, Auto";
cf072139 688 case V4L2_CID_EXPOSURE_METERING: return "Exposure, Metering Mode";
0bf6b7dc 689 case V4L2_CID_SCENE_MODE: return "Scene Mode";
fc162a09 690 case V4L2_CID_3A_LOCK: return "3A Lock";
2272ab65
SN		 691 case V4L2_CID_AUTO_FOCUS_START: return "Auto Focus, Start";
692 case V4L2_CID_AUTO_FOCUS_STOP: return "Auto Focus, Stop";
693 case V4L2_CID_AUTO_FOCUS_STATUS: return "Auto Focus, Status";
694 case V4L2_CID_AUTO_FOCUS_RANGE: return "Auto Focus, Range";
0996517c
HV		 695
696 /* FM Radio Modulator control */
6c8d6111 697 /* Keep the order of the 'case's the same as in videodev2.h! */
0996517c
HV		 698 case V4L2_CID_FM_TX_CLASS: return "FM Radio Modulator Controls";
699 case V4L2_CID_RDS_TX_DEVIATION: return "RDS Signal Deviation";
700 case V4L2_CID_RDS_TX_PI: return "RDS Program ID";
701 case V4L2_CID_RDS_TX_PTY: return "RDS Program Type";
702 case V4L2_CID_RDS_TX_PS_NAME: return "RDS PS Name";
703 case V4L2_CID_RDS_TX_RADIO_TEXT: return "RDS Radio Text";
704 case V4L2_CID_AUDIO_LIMITER_ENABLED: return "Audio Limiter Feature Enabled";
705 case V4L2_CID_AUDIO_LIMITER_RELEASE_TIME: return "Audio Limiter Release Time";
706 case V4L2_CID_AUDIO_LIMITER_DEVIATION: return "Audio Limiter Deviation";
f08aacf8 707 case V4L2_CID_AUDIO_COMPRESSION_ENABLED: return "Audio Compression Enabled";
0996517c
HV		 708 case V4L2_CID_AUDIO_COMPRESSION_GAIN: return "Audio Compression Gain";
709 case V4L2_CID_AUDIO_COMPRESSION_THRESHOLD: return "Audio Compression Threshold";
710 case V4L2_CID_AUDIO_COMPRESSION_ATTACK_TIME: return "Audio Compression Attack Time";
711 case V4L2_CID_AUDIO_COMPRESSION_RELEASE_TIME: return "Audio Compression Release Time";
712 case V4L2_CID_PILOT_TONE_ENABLED: return "Pilot Tone Feature Enabled";
713 case V4L2_CID_PILOT_TONE_DEVIATION: return "Pilot Tone Deviation";
714 case V4L2_CID_PILOT_TONE_FREQUENCY: return "Pilot Tone Frequency";
f08aacf8 715 case V4L2_CID_TUNE_PREEMPHASIS: return "Pre-Emphasis";
0996517c
HV		 716 case V4L2_CID_TUNE_POWER_LEVEL: return "Tune Power Level";
717 case V4L2_CID_TUNE_ANTENNA_CAPACITOR: return "Tune Antenna Capacitor";
718
0b159acd 719 /* Flash controls */
f08aacf8
HV		 720 case V4L2_CID_FLASH_CLASS: return "Flash Controls";
721 case V4L2_CID_FLASH_LED_MODE: return "LED Mode";
722 case V4L2_CID_FLASH_STROBE_SOURCE: return "Strobe Source";
0b159acd 723 case V4L2_CID_FLASH_STROBE: return "Strobe";
f08aacf8
HV		 724 case V4L2_CID_FLASH_STROBE_STOP: return "Stop Strobe";
725 case V4L2_CID_FLASH_STROBE_STATUS: return "Strobe Status";
726 case V4L2_CID_FLASH_TIMEOUT: return "Strobe Timeout";
727 case V4L2_CID_FLASH_INTENSITY: return "Intensity, Flash Mode";
728 case V4L2_CID_FLASH_TORCH_INTENSITY: return "Intensity, Torch Mode";
729 case V4L2_CID_FLASH_INDICATOR_INTENSITY: return "Intensity, Indicator";
0b159acd
SA		 730 case V4L2_CID_FLASH_FAULT: return "Faults";
731 case V4L2_CID_FLASH_CHARGE: return "Charge";
f08aacf8 732 case V4L2_CID_FLASH_READY: return "Ready to Strobe";
0b159acd 733
c7361ae1
SN		 734 /* JPEG encoder controls */
735 /* Keep the order of the 'case's the same as in videodev2.h! */
736 case V4L2_CID_JPEG_CLASS: return "JPEG Compression Controls";
737 case V4L2_CID_JPEG_CHROMA_SUBSAMPLING: return "Chroma Subsampling";
738 case V4L2_CID_JPEG_RESTART_INTERVAL: return "Restart Interval";
739 case V4L2_CID_JPEG_COMPRESSION_QUALITY: return "Compression Quality";
740 case V4L2_CID_JPEG_ACTIVE_MARKER: return "Active Markers";
741
8c9d236e
SA		 742 /* Image source controls */
743 case V4L2_CID_IMAGE_SOURCE_CLASS: return "Image Source Controls";
744 case V4L2_CID_VBLANK: return "Vertical Blanking";
745 case V4L2_CID_HBLANK: return "Horizontal Blanking";
746 case V4L2_CID_ANALOGUE_GAIN: return "Analogue Gain";
747
c643ee13
SA		 748 /* Image processing controls */
749 case V4L2_CID_IMAGE_PROC_CLASS: return "Image Processing Controls";
750 case V4L2_CID_LINK_FREQ: return "Link Frequency";
751 case V4L2_CID_PIXEL_RATE: return "Pixel Rate";
5ebef0fb 752 case V4L2_CID_TEST_PATTERN: return "Test Pattern";
c643ee13 753
977ebec7
HV		 754 /* DV controls */
755 case V4L2_CID_DV_CLASS: return "Digital Video Controls";
756 case V4L2_CID_DV_TX_HOTPLUG: return "Hotplug Present";
757 case V4L2_CID_DV_TX_RXSENSE: return "RxSense Present";
758 case V4L2_CID_DV_TX_EDID_PRESENT: return "EDID Present";
759 case V4L2_CID_DV_TX_MODE: return "Transmit Mode";
760 case V4L2_CID_DV_TX_RGB_RANGE: return "Tx RGB Quantization Range";
761 case V4L2_CID_DV_RX_POWER_PRESENT: return "Power Present";
762 case V4L2_CID_DV_RX_RGB_RANGE: return "Rx RGB Quantization Range";
763
0996517c
HV		 764 default:
765 return NULL;
766 }
767}
768EXPORT_SYMBOL(v4l2_ctrl_get_name);
769
770void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type,
771 s32 *min, s32 *max, s32 *step, s32 *def, u32 *flags)
772{
773 *name = v4l2_ctrl_get_name(id);
774 *flags = 0;
775
776 switch (id) {
777 case V4L2_CID_AUDIO_MUTE:
778 case V4L2_CID_AUDIO_LOUDNESS:
779 case V4L2_CID_AUTO_WHITE_BALANCE:
780 case V4L2_CID_AUTOGAIN:
781 case V4L2_CID_HFLIP:
782 case V4L2_CID_VFLIP:
783 case V4L2_CID_HUE_AUTO:
784 case V4L2_CID_CHROMA_AGC:
785 case V4L2_CID_COLOR_KILLER:
a2f8b84f 786 case V4L2_CID_AUTOBRIGHTNESS:
0996517c
HV		 787 case V4L2_CID_MPEG_AUDIO_MUTE:
788 case V4L2_CID_MPEG_VIDEO_MUTE:
789 case V4L2_CID_MPEG_VIDEO_GOP_CLOSURE:
790 case V4L2_CID_MPEG_VIDEO_PULLDOWN:
791 case V4L2_CID_EXPOSURE_AUTO_PRIORITY:
792 case V4L2_CID_FOCUS_AUTO:
793 case V4L2_CID_PRIVACY:
794 case V4L2_CID_AUDIO_LIMITER_ENABLED:
795 case V4L2_CID_AUDIO_COMPRESSION_ENABLED:
796 case V4L2_CID_PILOT_TONE_ENABLED:
008d35f2
JFM		 797 case V4L2_CID_ILLUMINATORS_1:
798 case V4L2_CID_ILLUMINATORS_2:
0b159acd
SA		 799 case V4L2_CID_FLASH_STROBE_STATUS:
800 case V4L2_CID_FLASH_CHARGE:
801 case V4L2_CID_FLASH_READY:
064f5096
KD		 802 case V4L2_CID_MPEG_VIDEO_DECODER_MPEG4_DEBLOCK_FILTER:
803 case V4L2_CID_MPEG_VIDEO_DECODER_SLICE_INTERFACE:
804 case V4L2_CID_MPEG_VIDEO_FRAME_RC_ENABLE:
805 case V4L2_CID_MPEG_VIDEO_MB_RC_ENABLE:
806 case V4L2_CID_MPEG_VIDEO_H264_8X8_TRANSFORM:
807 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_ENABLE:
808 case V4L2_CID_MPEG_VIDEO_MPEG4_QPEL:
44d44a1a 809 case V4L2_CID_WIDE_DYNAMIC_RANGE:
82b3056c 810 case V4L2_CID_IMAGE_STABILIZATION:
0996517c
HV		 811 *type = V4L2_CTRL_TYPE_BOOLEAN;
812 *min = 0;
813 *max = *step = 1;
814 break;
815 case V4L2_CID_PAN_RESET:
816 case V4L2_CID_TILT_RESET:
0b159acd
SA		 817 case V4L2_CID_FLASH_STROBE:
818 case V4L2_CID_FLASH_STROBE_STOP:
2272ab65
SN		 819 case V4L2_CID_AUTO_FOCUS_START:
820 case V4L2_CID_AUTO_FOCUS_STOP:
0996517c
HV		 821 *type = V4L2_CTRL_TYPE_BUTTON;
822 *flags |= V4L2_CTRL_FLAG_WRITE_ONLY;
823 *min = *max = *step = *def = 0;
824 break;
825 case V4L2_CID_POWER_LINE_FREQUENCY:
826 case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ:
827 case V4L2_CID_MPEG_AUDIO_ENCODING:
828 case V4L2_CID_MPEG_AUDIO_L1_BITRATE:
829 case V4L2_CID_MPEG_AUDIO_L2_BITRATE:
830 case V4L2_CID_MPEG_AUDIO_L3_BITRATE:
831 case V4L2_CID_MPEG_AUDIO_AC3_BITRATE:
832 case V4L2_CID_MPEG_AUDIO_MODE:
833 case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION:
834 case V4L2_CID_MPEG_AUDIO_EMPHASIS:
835 case V4L2_CID_MPEG_AUDIO_CRC:
24c19a21
HV		 836 case V4L2_CID_MPEG_AUDIO_DEC_PLAYBACK:
837 case V4L2_CID_MPEG_AUDIO_DEC_MULTILINGUAL_PLAYBACK:
0996517c
HV		 838 case V4L2_CID_MPEG_VIDEO_ENCODING:
839 case V4L2_CID_MPEG_VIDEO_ASPECT:
840 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
841 case V4L2_CID_MPEG_STREAM_TYPE:
842 case V4L2_CID_MPEG_STREAM_VBI_FMT:
843 case V4L2_CID_EXPOSURE_AUTO:
2272ab65 844 case V4L2_CID_AUTO_FOCUS_RANGE:
0996517c 845 case V4L2_CID_COLORFX:
e40a0573 846 case V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE:
0996517c 847 case V4L2_CID_TUNE_PREEMPHASIS:
0b159acd
SA		 848 case V4L2_CID_FLASH_LED_MODE:
849 case V4L2_CID_FLASH_STROBE_SOURCE:
064f5096
KD		 850 case V4L2_CID_MPEG_VIDEO_HEADER_MODE:
851 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE:
852 case V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE:
853 case V4L2_CID_MPEG_VIDEO_H264_LEVEL:
854 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE:
855 case V4L2_CID_MPEG_VIDEO_H264_PROFILE:
856 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC:
857 case V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL:
858 case V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE:
c7361ae1 859 case V4L2_CID_JPEG_CHROMA_SUBSAMPLING:
7f84ad8b 860 case V4L2_CID_ISO_SENSITIVITY_AUTO:
cf072139 861 case V4L2_CID_EXPOSURE_METERING:
0bf6b7dc 862 case V4L2_CID_SCENE_MODE:
977ebec7
HV		 863 case V4L2_CID_DV_TX_MODE:
864 case V4L2_CID_DV_TX_RGB_RANGE:
865 case V4L2_CID_DV_RX_RGB_RANGE:
5ebef0fb 866 case V4L2_CID_TEST_PATTERN:
0996517c
HV		 867 *type = V4L2_CTRL_TYPE_MENU;
868 break;
c643ee13
SA		 869 case V4L2_CID_LINK_FREQ:
870 *type = V4L2_CTRL_TYPE_INTEGER_MENU;
871 break;
0996517c
HV		 872 case V4L2_CID_RDS_TX_PS_NAME:
873 case V4L2_CID_RDS_TX_RADIO_TEXT:
874 *type = V4L2_CTRL_TYPE_STRING;
875 break;
7f84ad8b 876 case V4L2_CID_ISO_SENSITIVITY:
d58083c9
SN		 877 case V4L2_CID_AUTO_EXPOSURE_BIAS:
878 *type = V4L2_CTRL_TYPE_INTEGER_MENU;
879 break;
0996517c
HV		 880 case V4L2_CID_USER_CLASS:
881 case V4L2_CID_CAMERA_CLASS:
882 case V4L2_CID_MPEG_CLASS:
883 case V4L2_CID_FM_TX_CLASS:
0b159acd 884 case V4L2_CID_FLASH_CLASS:
c7361ae1 885 case V4L2_CID_JPEG_CLASS:
8c9d236e 886 case V4L2_CID_IMAGE_SOURCE_CLASS:
c643ee13 887 case V4L2_CID_IMAGE_PROC_CLASS:
977ebec7 888 case V4L2_CID_DV_CLASS:
0996517c
HV		 889 *type = V4L2_CTRL_TYPE_CTRL_CLASS;
890 /* You can neither read not write these */
891 *flags |= V4L2_CTRL_FLAG_READ_ONLY | V4L2_CTRL_FLAG_WRITE_ONLY;
892 *min = *max = *step = *def = 0;
893 break;
894 case V4L2_CID_BG_COLOR:
895 *type = V4L2_CTRL_TYPE_INTEGER;
896 *step = 1;
897 *min = 0;
898 /* Max is calculated as RGB888 that is 2^24 */
899 *max = 0xFFFFFF;
900 break;
0b159acd 901 case V4L2_CID_FLASH_FAULT:
c7361ae1 902 case V4L2_CID_JPEG_ACTIVE_MARKER:
fc162a09 903 case V4L2_CID_3A_LOCK:
2272ab65 904 case V4L2_CID_AUTO_FOCUS_STATUS:
977ebec7
HV		 905 case V4L2_CID_DV_TX_HOTPLUG:
906 case V4L2_CID_DV_TX_RXSENSE:
907 case V4L2_CID_DV_TX_EDID_PRESENT:
908 case V4L2_CID_DV_RX_POWER_PRESENT:
0b159acd
SA		 909 *type = V4L2_CTRL_TYPE_BITMASK;
910 break;
064f5096
KD		 911 case V4L2_CID_MIN_BUFFERS_FOR_CAPTURE:
912 case V4L2_CID_MIN_BUFFERS_FOR_OUTPUT:
913 *type = V4L2_CTRL_TYPE_INTEGER;
914 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
915 break;
24c19a21
HV		 916 case V4L2_CID_MPEG_VIDEO_DEC_FRAME:
917 case V4L2_CID_MPEG_VIDEO_DEC_PTS:
c643ee13
SA		 918 *flags |= V4L2_CTRL_FLAG_VOLATILE;
919 /* Fall through */
920 case V4L2_CID_PIXEL_RATE:
24c19a21 921 *type = V4L2_CTRL_TYPE_INTEGER64;
c643ee13 922 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
ca576811 923 *min = *max = *step = *def = 0;
24c19a21 924 break;
0996517c
HV		 925 default:
926 *type = V4L2_CTRL_TYPE_INTEGER;
927 break;
928 }
929 switch (id) {
930 case V4L2_CID_MPEG_AUDIO_ENCODING:
931 case V4L2_CID_MPEG_AUDIO_MODE:
932 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
933 case V4L2_CID_MPEG_VIDEO_B_FRAMES:
934 case V4L2_CID_MPEG_STREAM_TYPE:
935 *flags |= V4L2_CTRL_FLAG_UPDATE;
936 break;
937 case V4L2_CID_AUDIO_VOLUME:
938 case V4L2_CID_AUDIO_BALANCE:
939 case V4L2_CID_AUDIO_BASS:
940 case V4L2_CID_AUDIO_TREBLE:
941 case V4L2_CID_BRIGHTNESS:
942 case V4L2_CID_CONTRAST:
943 case V4L2_CID_SATURATION:
944 case V4L2_CID_HUE:
945 case V4L2_CID_RED_BALANCE:
946 case V4L2_CID_BLUE_BALANCE:
947 case V4L2_CID_GAMMA:
948 case V4L2_CID_SHARPNESS:
949 case V4L2_CID_CHROMA_GAIN:
950 case V4L2_CID_RDS_TX_DEVIATION:
951 case V4L2_CID_AUDIO_LIMITER_RELEASE_TIME:
952 case V4L2_CID_AUDIO_LIMITER_DEVIATION:
953 case V4L2_CID_AUDIO_COMPRESSION_GAIN:
954 case V4L2_CID_AUDIO_COMPRESSION_THRESHOLD:
955 case V4L2_CID_AUDIO_COMPRESSION_ATTACK_TIME:
956 case V4L2_CID_AUDIO_COMPRESSION_RELEASE_TIME:
957 case V4L2_CID_PILOT_TONE_DEVIATION:
958 case V4L2_CID_PILOT_TONE_FREQUENCY:
959 case V4L2_CID_TUNE_POWER_LEVEL:
960 case V4L2_CID_TUNE_ANTENNA_CAPACITOR:
961 *flags |= V4L2_CTRL_FLAG_SLIDER;
962 break;
963 case V4L2_CID_PAN_RELATIVE:
964 case V4L2_CID_TILT_RELATIVE:
965 case V4L2_CID_FOCUS_RELATIVE:
966 case V4L2_CID_IRIS_RELATIVE:
967 case V4L2_CID_ZOOM_RELATIVE:
968 *flags |= V4L2_CTRL_FLAG_WRITE_ONLY;
969 break;
0b159acd 970 case V4L2_CID_FLASH_STROBE_STATUS:
2272ab65 971 case V4L2_CID_AUTO_FOCUS_STATUS:
0b159acd 972 case V4L2_CID_FLASH_READY:
977ebec7
HV		 973 case V4L2_CID_DV_TX_HOTPLUG:
974 case V4L2_CID_DV_TX_RXSENSE:
975 case V4L2_CID_DV_TX_EDID_PRESENT:
976 case V4L2_CID_DV_RX_POWER_PRESENT:
0b159acd
SA		 977 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
978 break;
0996517c
HV		 979 }
980}
981EXPORT_SYMBOL(v4l2_ctrl_fill);
982
983/* Helper function to determine whether the control type is compatible with
984 VIDIOC_G/S_CTRL. */
985static bool type_is_int(const struct v4l2_ctrl *ctrl)
986{
987 switch (ctrl->type) {
988 case V4L2_CTRL_TYPE_INTEGER64:
989 case V4L2_CTRL_TYPE_STRING:
990 /* Nope, these need v4l2_ext_control */
991 return false;
992 default:
993 return true;
994 }
995}
996
6e239399
HV		 997static void fill_event(struct v4l2_event *ev, struct v4l2_ctrl *ctrl, u32 changes)
998{
999 memset(ev->reserved, 0, sizeof(ev->reserved));
1000 ev->type = V4L2_EVENT_CTRL;
1001 ev->id = ctrl->id;
1002 ev->u.ctrl.changes = changes;
1003 ev->u.ctrl.type = ctrl->type;
1004 ev->u.ctrl.flags = ctrl->flags;
1005 if (ctrl->type == V4L2_CTRL_TYPE_STRING)
1006 ev->u.ctrl.value64 = 0;
1007 else
1008 ev->u.ctrl.value64 = ctrl->cur.val64;
1009 ev->u.ctrl.minimum = ctrl->minimum;
1010 ev->u.ctrl.maximum = ctrl->maximum;
ce580fe5
SA		 1011 if (ctrl->type == V4L2_CTRL_TYPE_MENU
1012 || ctrl->type == V4L2_CTRL_TYPE_INTEGER_MENU)
6e239399
HV		 1013 ev->u.ctrl.step = 1;
1014 else
1015 ev->u.ctrl.step = ctrl->step;
1016 ev->u.ctrl.default_value = ctrl->default_value;
1017}
1018
1019static void send_event(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, u32 changes)
1020{
1021 struct v4l2_event ev;
77068d36 1022 struct v4l2_subscribed_event *sev;
6e239399 1023
77068d36 1024 if (list_empty(&ctrl->ev_subs))
3f66f0ed 1025 return;
6e239399
HV		 1026 fill_event(&ev, ctrl, changes);
1027
77068d36 1028 list_for_each_entry(sev, &ctrl->ev_subs, node)
e3e72f39
HG		 1029 if (sev->fh != fh ||
1030 (sev->flags & V4L2_EVENT_SUB_FL_ALLOW_FEEDBACK))
77068d36 1031 v4l2_event_queue_fh(sev->fh, &ev);
6e239399
HV		 1032}
1033
0996517c
HV		 1034/* Helper function: copy the current control value back to the caller */
1035static int cur_to_user(struct v4l2_ext_control *c,
1036 struct v4l2_ctrl *ctrl)
1037{
1038 u32 len;
1039
1040 switch (ctrl->type) {
1041 case V4L2_CTRL_TYPE_STRING:
1042 len = strlen(ctrl->cur.string);
1043 if (c->size < len + 1) {
1044 c->size = len + 1;
1045 return -ENOSPC;
1046 }
1047 return copy_to_user(c->string, ctrl->cur.string,
1048 len + 1) ? -EFAULT : 0;
1049 case V4L2_CTRL_TYPE_INTEGER64:
1050 c->value64 = ctrl->cur.val64;
1051 break;
1052 default:
1053 c->value = ctrl->cur.val;
1054 break;
1055 }
1056 return 0;
1057}
1058
1059/* Helper function: copy the caller-provider value as the new control value */
1060static int user_to_new(struct v4l2_ext_control *c,
1061 struct v4l2_ctrl *ctrl)
1062{
1063 int ret;
1064 u32 size;
1065
2a863793 1066 ctrl->is_new = 1;
0996517c
HV		 1067 switch (ctrl->type) {
1068 case V4L2_CTRL_TYPE_INTEGER64:
1069 ctrl->val64 = c->value64;
1070 break;
1071 case V4L2_CTRL_TYPE_STRING:
1072 size = c->size;
1073 if (size == 0)
1074 return -ERANGE;
1075 if (size > ctrl->maximum + 1)
1076 size = ctrl->maximum + 1;
1077 ret = copy_from_user(ctrl->string, c->string, size);
1078 if (!ret) {
1079 char last = ctrl->string[size - 1];
1080
1081 ctrl->string[size - 1] = 0;
1082 /* If the string was longer than ctrl->maximum,
1083 then return an error. */
1084 if (strlen(ctrl->string) == ctrl->maximum && last)
1085 return -ERANGE;
1086 }
1087 return ret ? -EFAULT : 0;
1088 default:
1089 ctrl->val = c->value;
1090 break;
1091 }
1092 return 0;
1093}
1094
1095/* Helper function: copy the new control value back to the caller */
1096static int new_to_user(struct v4l2_ext_control *c,
1097 struct v4l2_ctrl *ctrl)
1098{
1099 u32 len;
1100
1101 switch (ctrl->type) {
1102 case V4L2_CTRL_TYPE_STRING:
1103 len = strlen(ctrl->string);
1104 if (c->size < len + 1) {
1105 c->size = ctrl->maximum + 1;
1106 return -ENOSPC;
1107 }
1108 return copy_to_user(c->string, ctrl->string,
1109 len + 1) ? -EFAULT : 0;
1110 case V4L2_CTRL_TYPE_INTEGER64:
1111 c->value64 = ctrl->val64;
1112 break;
1113 default:
1114 c->value = ctrl->val;
1115 break;
1116 }
1117 return 0;
1118}
1119
1120/* Copy the new value to the current value. */
ab892bac
HV		 1121static void new_to_cur(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl,
1122 bool update_inactive)
0996517c 1123{
6e239399
HV		 1124 bool changed = false;
1125
0996517c
HV		 1126 if (ctrl == NULL)
1127 return;
1128 switch (ctrl->type) {
6e239399
HV		 1129 case V4L2_CTRL_TYPE_BUTTON:
1130 changed = true;
1131 break;
0996517c
HV		 1132 case V4L2_CTRL_TYPE_STRING:
1133 /* strings are always 0-terminated */
6e239399 1134 changed = strcmp(ctrl->string, ctrl->cur.string);
0996517c
HV		 1135 strcpy(ctrl->cur.string, ctrl->string);
1136 break;
1137 case V4L2_CTRL_TYPE_INTEGER64:
6e239399 1138 changed = ctrl->val64 != ctrl->cur.val64;
0996517c
HV		 1139 ctrl->cur.val64 = ctrl->val64;
1140 break;
1141 default:
6e239399 1142 changed = ctrl->val != ctrl->cur.val;
0996517c
HV		 1143 ctrl->cur.val = ctrl->val;
1144 break;
1145 }
72d877ca 1146 if (update_inactive) {
5626b8c7
HV		 1147 /* Note: update_inactive can only be true for auto clusters. */
1148 ctrl->flags &=
1149 ~(V4L2_CTRL_FLAG_INACTIVE | V4L2_CTRL_FLAG_VOLATILE);
1150 if (!is_cur_manual(ctrl->cluster[0])) {
72d877ca 1151 ctrl->flags |= V4L2_CTRL_FLAG_INACTIVE;
5626b8c7
HV		 1152 if (ctrl->cluster[0]->has_volatiles)
1153 ctrl->flags |= V4L2_CTRL_FLAG_VOLATILE;
1154 }
1249a3a8 1155 fh = NULL;
72d877ca 1156 }
639884a6
HV		 1157 if (changed || update_inactive) {
1158 /* If a control was changed that was not one of the controls
1159 modified by the application, then send the event to all. */
1160 if (!ctrl->is_new)
1161 fh = NULL;
6e239399
HV		 1162 send_event(fh, ctrl,
1163 (changed ? V4L2_EVENT_CTRL_CH_VALUE : 0) |
1164 (update_inactive ? V4L2_EVENT_CTRL_CH_FLAGS : 0));
639884a6 1165 }
0996517c
HV		 1166}
1167
1168/* Copy the current value to the new value */
1169static void cur_to_new(struct v4l2_ctrl *ctrl)
1170{
1171 if (ctrl == NULL)
1172 return;
1173 switch (ctrl->type) {
1174 case V4L2_CTRL_TYPE_STRING:
1175 /* strings are always 0-terminated */
1176 strcpy(ctrl->string, ctrl->cur.string);
1177 break;
1178 case V4L2_CTRL_TYPE_INTEGER64:
1179 ctrl->val64 = ctrl->cur.val64;
1180 break;
1181 default:
1182 ctrl->val = ctrl->cur.val;
1183 break;
1184 }
1185}
1186
1187/* Return non-zero if one or more of the controls in the cluster has a new
1188 value that differs from the current value. */
1189static int cluster_changed(struct v4l2_ctrl *master)
1190{
1191 int diff = 0;
1192 int i;
1193
1194 for (i = 0; !diff && i < master->ncontrols; i++) {
1195 struct v4l2_ctrl *ctrl = master->cluster[i];
1196
1197 if (ctrl == NULL)
1198 continue;
1199 switch (ctrl->type) {
1200 case V4L2_CTRL_TYPE_BUTTON:
1201 /* Button controls are always 'different' */
1202 return 1;
1203 case V4L2_CTRL_TYPE_STRING:
1204 /* strings are always 0-terminated */
1205 diff = strcmp(ctrl->string, ctrl->cur.string);
1206 break;
1207 case V4L2_CTRL_TYPE_INTEGER64:
1208 diff = ctrl->val64 != ctrl->cur.val64;
1209 break;
1210 default:
1211 diff = ctrl->val != ctrl->cur.val;
1212 break;
1213 }
1214 }
1215 return diff;
1216}
1217
03d5285b
LP		 1218/* Validate a new control */
1219static int validate_new(const struct v4l2_ctrl *ctrl,
1220 struct v4l2_ext_control *c)
0996517c 1221{
03d5285b 1222 size_t len;
0996517c 1223 u32 offset;
03d5285b 1224 s32 val;
0996517c
HV		 1225
1226 switch (ctrl->type) {
1227 case V4L2_CTRL_TYPE_INTEGER:
1228 /* Round towards the closest legal value */
03d5285b
LP		 1229 val = c->value + ctrl->step / 2;
1230 val = clamp(val, ctrl->minimum, ctrl->maximum);
0996517c
HV		 1231 offset = val - ctrl->minimum;
1232 offset = ctrl->step * (offset / ctrl->step);
03d5285b 1233 c->value = ctrl->minimum + offset;
0996517c
HV		 1234 return 0;
1235
1236 case V4L2_CTRL_TYPE_BOOLEAN:
03d5285b 1237 c->value = !!c->value;
0996517c
HV		 1238 return 0;
1239
1240 case V4L2_CTRL_TYPE_MENU:
ce580fe5 1241 case V4L2_CTRL_TYPE_INTEGER_MENU:
03d5285b 1242 if (c->value < ctrl->minimum || c->value > ctrl->maximum)
0996517c 1243 return -ERANGE;
03d5285b 1244 if (ctrl->menu_skip_mask & (1 << c->value))
ce580fe5
SA		 1245 return -EINVAL;
1246 if (ctrl->type == V4L2_CTRL_TYPE_MENU &&
03d5285b 1247 ctrl->qmenu[c->value][0] == '\0')
0996517c
HV		 1248 return -EINVAL;
1249 return 0;
1250
fa4d7096 1251 case V4L2_CTRL_TYPE_BITMASK:
03d5285b 1252 c->value &= ctrl->maximum;
fa4d7096
HV		 1253 return 0;
1254
0996517c
HV		 1255 case V4L2_CTRL_TYPE_BUTTON:
1256 case V4L2_CTRL_TYPE_CTRL_CLASS:
03d5285b 1257 c->value = 0;
0996517c
HV		 1258 return 0;
1259
1260 case V4L2_CTRL_TYPE_INTEGER64:
1261 return 0;
1262
1263 case V4L2_CTRL_TYPE_STRING:
03d5285b 1264 len = strlen(c->string);
0996517c
HV		 1265 if (len < ctrl->minimum)
1266 return -ERANGE;
1267 if ((len - ctrl->minimum) % ctrl->step)
1268 return -ERANGE;
1269 return 0;
1270
1271 default:
1272 return -EINVAL;
1273 }
1274}
1275
1276static inline u32 node2id(struct list_head *node)
1277{
1278 return list_entry(node, struct v4l2_ctrl_ref, node)->ctrl->id;
1279}
1280
1281/* Set the handler's error code if it wasn't set earlier already */
1282static inline int handler_set_err(struct v4l2_ctrl_handler *hdl, int err)
1283{
1284 if (hdl->error == 0)
1285 hdl->error = err;
1286 return err;
1287}
1288
1289/* Initialize the handler */
1290int v4l2_ctrl_handler_init(struct v4l2_ctrl_handler *hdl,
1291 unsigned nr_of_controls_hint)
1292{
77e7c4e6
SA		 1293 hdl->lock = &hdl->_lock;
1294 mutex_init(hdl->lock);
0996517c
HV		 1295 INIT_LIST_HEAD(&hdl->ctrls);
1296 INIT_LIST_HEAD(&hdl->ctrl_refs);
1297 hdl->nr_of_buckets = 1 + nr_of_controls_hint / 8;
9884d7be
TM		 1298 hdl->buckets = kcalloc(hdl->nr_of_buckets, sizeof(hdl->buckets[0]),
1299 GFP_KERNEL);
0996517c
HV		 1300 hdl->error = hdl->buckets ? 0 : -ENOMEM;
1301 return hdl->error;
1302}
1303EXPORT_SYMBOL(v4l2_ctrl_handler_init);
1304
1305/* Free all controls and control refs */
1306void v4l2_ctrl_handler_free(struct v4l2_ctrl_handler *hdl)
1307{
1308 struct v4l2_ctrl_ref *ref, *next_ref;
1309 struct v4l2_ctrl *ctrl, *next_ctrl;
77068d36 1310 struct v4l2_subscribed_event *sev, *next_sev;
0996517c
HV		 1311
1312 if (hdl == NULL || hdl->buckets == NULL)
1313 return;
1314
77e7c4e6 1315 mutex_lock(hdl->lock);
0996517c
HV		 1316 /* Free all nodes */
1317 list_for_each_entry_safe(ref, next_ref, &hdl->ctrl_refs, node) {
1318 list_del(&ref->node);
1319 kfree(ref);
1320 }
1321 /* Free all controls owned by the handler */
1322 list_for_each_entry_safe(ctrl, next_ctrl, &hdl->ctrls, node) {
1323 list_del(&ctrl->node);
77068d36
HV		 1324 list_for_each_entry_safe(sev, next_sev, &ctrl->ev_subs, node)
1325 list_del(&sev->node);
0996517c
HV		 1326 kfree(ctrl);
1327 }
1328 kfree(hdl->buckets);
1329 hdl->buckets = NULL;
1330 hdl->cached = NULL;
1331 hdl->error = 0;
77e7c4e6 1332 mutex_unlock(hdl->lock);
0996517c
HV		 1333}
1334EXPORT_SYMBOL(v4l2_ctrl_handler_free);
1335
1336/* For backwards compatibility: V4L2_CID_PRIVATE_BASE should no longer
1337 be used except in G_CTRL, S_CTRL, QUERYCTRL and QUERYMENU when dealing
1338 with applications that do not use the NEXT_CTRL flag.
1339
1340 We just find the n-th private user control. It's O(N), but that should not
1341 be an issue in this particular case. */
1342static struct v4l2_ctrl_ref *find_private_ref(
1343 struct v4l2_ctrl_handler *hdl, u32 id)
1344{
1345 struct v4l2_ctrl_ref *ref;
1346
1347 id -= V4L2_CID_PRIVATE_BASE;
1348 list_for_each_entry(ref, &hdl->ctrl_refs, node) {
1349 /* Search for private user controls that are compatible with
1350 VIDIOC_G/S_CTRL. */
1351 if (V4L2_CTRL_ID2CLASS(ref->ctrl->id) == V4L2_CTRL_CLASS_USER &&
1352 V4L2_CTRL_DRIVER_PRIV(ref->ctrl->id)) {
1353 if (!type_is_int(ref->ctrl))
1354 continue;
1355 if (id == 0)
1356 return ref;
1357 id--;
1358 }
1359 }
1360 return NULL;
1361}
1362
1363/* Find a control with the given ID. */
1364static struct v4l2_ctrl_ref *find_ref(struct v4l2_ctrl_handler *hdl, u32 id)
1365{
1366 struct v4l2_ctrl_ref *ref;
1367 int bucket;
1368
1369 id &= V4L2_CTRL_ID_MASK;
1370
1371 /* Old-style private controls need special handling */
1372 if (id >= V4L2_CID_PRIVATE_BASE)
1373 return find_private_ref(hdl, id);
1374 bucket = id % hdl->nr_of_buckets;
1375
1376 /* Simple optimization: cache the last control found */
1377 if (hdl->cached && hdl->cached->ctrl->id == id)
1378 return hdl->cached;
1379
1380 /* Not in cache, search the hash */
1381 ref = hdl->buckets ? hdl->buckets[bucket] : NULL;
1382 while (ref && ref->ctrl->id != id)
1383 ref = ref->next;
1384
1385 if (ref)
1386 hdl->cached = ref; /* cache it! */
1387 return ref;
1388}
1389
1390/* Find a control with the given ID. Take the handler's lock first. */
1391static struct v4l2_ctrl_ref *find_ref_lock(
1392 struct v4l2_ctrl_handler *hdl, u32 id)
1393{
1394 struct v4l2_ctrl_ref *ref = NULL;
1395
1396 if (hdl) {
77e7c4e6 1397 mutex_lock(hdl->lock);
0996517c 1398 ref = find_ref(hdl, id);
77e7c4e6 1399 mutex_unlock(hdl->lock);
0996517c
HV		 1400 }
1401 return ref;
1402}
1403
1404/* Find a control with the given ID. */
1405struct v4l2_ctrl *v4l2_ctrl_find(struct v4l2_ctrl_handler *hdl, u32 id)
1406{
1407 struct v4l2_ctrl_ref *ref = find_ref_lock(hdl, id);
1408
1409 return ref ? ref->ctrl : NULL;
1410}
1411EXPORT_SYMBOL(v4l2_ctrl_find);
1412
1413/* Allocate a new v4l2_ctrl_ref and hook it into the handler. */
1414static int handler_new_ref(struct v4l2_ctrl_handler *hdl,
1415 struct v4l2_ctrl *ctrl)
1416{
1417 struct v4l2_ctrl_ref *ref;
1418 struct v4l2_ctrl_ref *new_ref;
1419 u32 id = ctrl->id;
1420 u32 class_ctrl = V4L2_CTRL_ID2CLASS(id) | 1;
1421 int bucket = id % hdl->nr_of_buckets; /* which bucket to use */
1422
1423 /* Automatically add the control class if it is not yet present. */
1424 if (id != class_ctrl && find_ref_lock(hdl, class_ctrl) == NULL)
1425 if (!v4l2_ctrl_new_std(hdl, NULL, class_ctrl, 0, 0, 0, 0))
1426 return hdl->error;
1427
1428 if (hdl->error)
1429 return hdl->error;
1430
1431 new_ref = kzalloc(sizeof(*new_ref), GFP_KERNEL);
1432 if (!new_ref)
1433 return handler_set_err(hdl, -ENOMEM);
1434 new_ref->ctrl = ctrl;
1435 if (ctrl->handler == hdl) {
1436 /* By default each control starts in a cluster of its own.
1437 new_ref->ctrl is basically a cluster array with one
1438 element, so that's perfect to use as the cluster pointer.
1439 But only do this for the handler that owns the control. */
1440 ctrl->cluster = &new_ref->ctrl;
1441 ctrl->ncontrols = 1;
1442 }
1443
1444 INIT_LIST_HEAD(&new_ref->node);
1445
77e7c4e6 1446 mutex_lock(hdl->lock);
0996517c
HV		 1447
1448 /* Add immediately at the end of the list if the list is empty, or if
1449 the last element in the list has a lower ID.
1450 This ensures that when elements are added in ascending order the
1451 insertion is an O(1) operation. */
1452 if (list_empty(&hdl->ctrl_refs) || id > node2id(hdl->ctrl_refs.prev)) {
1453 list_add_tail(&new_ref->node, &hdl->ctrl_refs);
1454 goto insert_in_hash;
1455 }
1456
1457 /* Find insert position in sorted list */
1458 list_for_each_entry(ref, &hdl->ctrl_refs, node) {
1459 if (ref->ctrl->id < id)
1460 continue;
1461 /* Don't add duplicates */
1462 if (ref->ctrl->id == id) {
1463 kfree(new_ref);
1464 goto unlock;
1465 }
1466 list_add(&new_ref->node, ref->node.prev);
1467 break;
1468 }
1469
1470insert_in_hash:
1471 /* Insert the control node in the hash */
1472 new_ref->next = hdl->buckets[bucket];
1473 hdl->buckets[bucket] = new_ref;
1474
1475unlock:
77e7c4e6 1476 mutex_unlock(hdl->lock);
0996517c
HV		 1477 return 0;
1478}
1479
1480/* Add a new control */
1481static struct v4l2_ctrl *v4l2_ctrl_new(struct v4l2_ctrl_handler *hdl,
1482 const struct v4l2_ctrl_ops *ops,
1483 u32 id, const char *name, enum v4l2_ctrl_type type,
1484 s32 min, s32 max, u32 step, s32 def,
ce580fe5
SA		 1485 u32 flags, const char * const *qmenu,
1486 const s64 *qmenu_int, void *priv)
0996517c
HV		 1487{
1488 struct v4l2_ctrl *ctrl;
1489 unsigned sz_extra = 0;
1490
1491 if (hdl->error)
1492 return NULL;
1493
1494 /* Sanity checks */
1495 if (id == 0 || name == NULL || id >= V4L2_CID_PRIVATE_BASE ||
0996517c 1496 (type == V4L2_CTRL_TYPE_INTEGER && step == 0) ||
fa4d7096 1497 (type == V4L2_CTRL_TYPE_BITMASK && max == 0) ||
0996517c 1498 (type == V4L2_CTRL_TYPE_MENU && qmenu == NULL) ||
ce580fe5 1499 (type == V4L2_CTRL_TYPE_INTEGER_MENU && qmenu_int == NULL) ||
0996517c
HV		 1500 (type == V4L2_CTRL_TYPE_STRING && max == 0)) {
1501 handler_set_err(hdl, -ERANGE);
1502 return NULL;
1503 }
fa4d7096
HV		 1504 if (type != V4L2_CTRL_TYPE_BITMASK && max < min) {
1505 handler_set_err(hdl, -ERANGE);
1506 return NULL;
1507 }
02ac0480
HV		 1508 if ((type == V4L2_CTRL_TYPE_INTEGER ||
1509 type == V4L2_CTRL_TYPE_MENU ||
ce580fe5 1510 type == V4L2_CTRL_TYPE_INTEGER_MENU ||
02ac0480
HV		 1511 type == V4L2_CTRL_TYPE_BOOLEAN) &&
1512 (def < min || def > max)) {
1513 handler_set_err(hdl, -ERANGE);
1514 return NULL;
1515 }
fa4d7096
HV		 1516 if (type == V4L2_CTRL_TYPE_BITMASK && ((def & ~max) || min || step)) {
1517 handler_set_err(hdl, -ERANGE);
1518 return NULL;
1519 }
0996517c
HV		 1520
1521 if (type == V4L2_CTRL_TYPE_BUTTON)
1522 flags |= V4L2_CTRL_FLAG_WRITE_ONLY;
1523 else if (type == V4L2_CTRL_TYPE_CTRL_CLASS)
1524 flags |= V4L2_CTRL_FLAG_READ_ONLY;
1525 else if (type == V4L2_CTRL_TYPE_STRING)
1526 sz_extra += 2 * (max + 1);
1527
1528 ctrl = kzalloc(sizeof(*ctrl) + sz_extra, GFP_KERNEL);
1529 if (ctrl == NULL) {
1530 handler_set_err(hdl, -ENOMEM);
1531 return NULL;
1532 }
1533
1534 INIT_LIST_HEAD(&ctrl->node);
77068d36 1535 INIT_LIST_HEAD(&ctrl->ev_subs);
0996517c
HV		 1536 ctrl->handler = hdl;
1537 ctrl->ops = ops;
1538 ctrl->id = id;
1539 ctrl->name = name;
1540 ctrl->type = type;
1541 ctrl->flags = flags;
1542 ctrl->minimum = min;
1543 ctrl->maximum = max;
1544 ctrl->step = step;
ce580fe5
SA		 1545 if (type == V4L2_CTRL_TYPE_MENU)
1546 ctrl->qmenu = qmenu;
1547 else if (type == V4L2_CTRL_TYPE_INTEGER_MENU)
1548 ctrl->qmenu_int = qmenu_int;
0996517c
HV		 1549 ctrl->priv = priv;
1550 ctrl->cur.val = ctrl->val = ctrl->default_value = def;
1551
1552 if (ctrl->type == V4L2_CTRL_TYPE_STRING) {
1553 ctrl->cur.string = (char *)&ctrl[1] + sz_extra - (max + 1);
1554 ctrl->string = (char *)&ctrl[1] + sz_extra - 2 * (max + 1);
1555 if (ctrl->minimum)
1556 memset(ctrl->cur.string, ' ', ctrl->minimum);
1557 }
1558 if (handler_new_ref(hdl, ctrl)) {
1559 kfree(ctrl);
1560 return NULL;
1561 }
77e7c4e6 1562 mutex_lock(hdl->lock);
0996517c 1563 list_add_tail(&ctrl->node, &hdl->ctrls);
77e7c4e6 1564 mutex_unlock(hdl->lock);
0996517c
HV		 1565 return ctrl;
1566}
1567
1568struct v4l2_ctrl *v4l2_ctrl_new_custom(struct v4l2_ctrl_handler *hdl,
1569 const struct v4l2_ctrl_config *cfg, void *priv)
1570{
1571 bool is_menu;
1572 struct v4l2_ctrl *ctrl;
1573 const char *name = cfg->name;
513521ea 1574 const char * const *qmenu = cfg->qmenu;
ce580fe5 1575 const s64 *qmenu_int = cfg->qmenu_int;
0996517c
HV		 1576 enum v4l2_ctrl_type type = cfg->type;
1577 u32 flags = cfg->flags;
1578 s32 min = cfg->min;
1579 s32 max = cfg->max;
1580 u32 step = cfg->step;
1581 s32 def = cfg->def;
1582
1583 if (name == NULL)
1584 v4l2_ctrl_fill(cfg->id, &name, &type, &min, &max, &step,
1585 &def, &flags);
1586
ce580fe5
SA		 1587 is_menu = (cfg->type == V4L2_CTRL_TYPE_MENU ||
1588 cfg->type == V4L2_CTRL_TYPE_INTEGER_MENU);
0996517c
HV		 1589 if (is_menu)
1590 WARN_ON(step);
1591 else
1592 WARN_ON(cfg->menu_skip_mask);
ce580fe5 1593 if (cfg->type == V4L2_CTRL_TYPE_MENU && qmenu == NULL)
0996517c 1594 qmenu = v4l2_ctrl_get_menu(cfg->id);
ce580fe5
SA		 1595 else if (cfg->type == V4L2_CTRL_TYPE_INTEGER_MENU &&
1596 qmenu_int == NULL) {
1597 handler_set_err(hdl, -EINVAL);
1598 return NULL;
1599 }
0996517c
HV		 1600
1601 ctrl = v4l2_ctrl_new(hdl, cfg->ops, cfg->id, name,
1602 type, min, max,
1603 is_menu ? cfg->menu_skip_mask : step,
ce580fe5 1604 def, flags, qmenu, qmenu_int, priv);
88365105 1605 if (ctrl)
0996517c 1606 ctrl->is_private = cfg->is_private;
0996517c
HV		 1607 return ctrl;
1608}
1609EXPORT_SYMBOL(v4l2_ctrl_new_custom);
1610
1611/* Helper function for standard non-menu controls */
1612struct v4l2_ctrl *v4l2_ctrl_new_std(struct v4l2_ctrl_handler *hdl,
1613 const struct v4l2_ctrl_ops *ops,
1614 u32 id, s32 min, s32 max, u32 step, s32 def)
1615{
1616 const char *name;
1617 enum v4l2_ctrl_type type;
1618 u32 flags;
1619
1620 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
ce580fe5
SA		 1621 if (type == V4L2_CTRL_TYPE_MENU
1622 || type == V4L2_CTRL_TYPE_INTEGER_MENU) {
0996517c
HV		 1623 handler_set_err(hdl, -EINVAL);
1624 return NULL;
1625 }
1626 return v4l2_ctrl_new(hdl, ops, id, name, type,
ce580fe5 1627 min, max, step, def, flags, NULL, NULL, NULL);
0996517c
HV		 1628}
1629EXPORT_SYMBOL(v4l2_ctrl_new_std);
1630
1631/* Helper function for standard menu controls */
1632struct v4l2_ctrl *v4l2_ctrl_new_std_menu(struct v4l2_ctrl_handler *hdl,
1633 const struct v4l2_ctrl_ops *ops,
1634 u32 id, s32 max, s32 mask, s32 def)
1635{
513521ea 1636 const char * const *qmenu = v4l2_ctrl_get_menu(id);
0996517c
HV		 1637 const char *name;
1638 enum v4l2_ctrl_type type;
1639 s32 min;
1640 s32 step;
1641 u32 flags;
1642
1643 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
1644 if (type != V4L2_CTRL_TYPE_MENU) {
1645 handler_set_err(hdl, -EINVAL);
1646 return NULL;
1647 }
1648 return v4l2_ctrl_new(hdl, ops, id, name, type,
ce580fe5 1649 0, max, mask, def, flags, qmenu, NULL, NULL);
0996517c
HV		 1650}
1651EXPORT_SYMBOL(v4l2_ctrl_new_std_menu);
1652
515f3287
SN		 1653/* Helper function for standard integer menu controls */
1654struct v4l2_ctrl *v4l2_ctrl_new_int_menu(struct v4l2_ctrl_handler *hdl,
1655 const struct v4l2_ctrl_ops *ops,
1656 u32 id, s32 max, s32 def, const s64 *qmenu_int)
1657{
1658 const char *name;
1659 enum v4l2_ctrl_type type;
1660 s32 min;
1661 s32 step;
1662 u32 flags;
1663
1664 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
1665 if (type != V4L2_CTRL_TYPE_INTEGER_MENU) {
1666 handler_set_err(hdl, -EINVAL);
1667 return NULL;
1668 }
1669 return v4l2_ctrl_new(hdl, ops, id, name, type,
1670 0, max, 0, def, flags, NULL, qmenu_int, NULL);
1671}
1672EXPORT_SYMBOL(v4l2_ctrl_new_int_menu);
1673
0996517c
HV		 1674/* Add a control from another handler to this handler */
1675struct v4l2_ctrl *v4l2_ctrl_add_ctrl(struct v4l2_ctrl_handler *hdl,
1676 struct v4l2_ctrl *ctrl)
1677{
1678 if (hdl == NULL || hdl->error)
1679 return NULL;
1680 if (ctrl == NULL) {
1681 handler_set_err(hdl, -EINVAL);
1682 return NULL;
1683 }
1684 if (ctrl->handler == hdl)
1685 return ctrl;
1686 return handler_new_ref(hdl, ctrl) ? NULL : ctrl;
1687}
1688EXPORT_SYMBOL(v4l2_ctrl_add_ctrl);
1689
1690/* Add the controls from another handler to our own. */
1691int v4l2_ctrl_add_handler(struct v4l2_ctrl_handler *hdl,
34a6b7d0
HV		 1692 struct v4l2_ctrl_handler *add,
1693 bool (*filter)(const struct v4l2_ctrl *ctrl))
0996517c 1694{
072e6602 1695 struct v4l2_ctrl_ref *ref;
0996517c
HV		 1696 int ret = 0;
1697
1698 /* Do nothing if either handler is NULL or if they are the same */
1699 if (!hdl || !add || hdl == add)
1700 return 0;
1701 if (hdl->error)
1702 return hdl->error;
77e7c4e6 1703 mutex_lock(add->lock);
072e6602
HV		 1704 list_for_each_entry(ref, &add->ctrl_refs, node) {
1705 struct v4l2_ctrl *ctrl = ref->ctrl;
1706
0996517c
HV		 1707 /* Skip handler-private controls. */
1708 if (ctrl->is_private)
1709 continue;
6e239399
HV		 1710 /* And control classes */
1711 if (ctrl->type == V4L2_CTRL_TYPE_CTRL_CLASS)
1712 continue;
34a6b7d0
HV		 1713 /* Filter any unwanted controls */
1714 if (filter && !filter(ctrl))
1715 continue;
0996517c
HV		 1716 ret = handler_new_ref(hdl, ctrl);
1717 if (ret)
1718 break;
1719 }
77e7c4e6 1720 mutex_unlock(add->lock);
0996517c
HV		 1721 return ret;
1722}
1723EXPORT_SYMBOL(v4l2_ctrl_add_handler);
1724
34a6b7d0
HV		 1725bool v4l2_ctrl_radio_filter(const struct v4l2_ctrl *ctrl)
1726{
1727 if (V4L2_CTRL_ID2CLASS(ctrl->id) == V4L2_CTRL_CLASS_FM_TX)
1728 return true;
1729 switch (ctrl->id) {
1730 case V4L2_CID_AUDIO_MUTE:
1731 case V4L2_CID_AUDIO_VOLUME:
1732 case V4L2_CID_AUDIO_BALANCE:
1733 case V4L2_CID_AUDIO_BASS:
1734 case V4L2_CID_AUDIO_TREBLE:
1735 case V4L2_CID_AUDIO_LOUDNESS:
1736 return true;
1737 default:
1738 break;
1739 }
1740 return false;
1741}
1742EXPORT_SYMBOL(v4l2_ctrl_radio_filter);
1743
0996517c
HV		 1744/* Cluster controls */
1745void v4l2_ctrl_cluster(unsigned ncontrols, struct v4l2_ctrl **controls)
1746{
5626b8c7 1747 bool has_volatiles = false;
0996517c
HV		 1748 int i;
1749
1750 /* The first control is the master control and it must not be NULL */
72d877ca 1751 BUG_ON(ncontrols == 0 || controls[0] == NULL);
0996517c
HV		 1752
1753 for (i = 0; i < ncontrols; i++) {
1754 if (controls[i]) {
1755 controls[i]->cluster = controls;
1756 controls[i]->ncontrols = ncontrols;
5626b8c7
HV		 1757 if (controls[i]->flags & V4L2_CTRL_FLAG_VOLATILE)
1758 has_volatiles = true;
0996517c
HV		 1759 }
1760 }
5626b8c7 1761 controls[0]->has_volatiles = has_volatiles;
0996517c
HV		 1762}
1763EXPORT_SYMBOL(v4l2_ctrl_cluster);
1764
72d877ca
HV		 1765void v4l2_ctrl_auto_cluster(unsigned ncontrols, struct v4l2_ctrl **controls,
1766 u8 manual_val, bool set_volatile)
1767{
1768 struct v4l2_ctrl *master = controls[0];
5626b8c7 1769 u32 flag = 0;
72d877ca
HV		 1770 int i;
1771
1772 v4l2_ctrl_cluster(ncontrols, controls);
1773 WARN_ON(ncontrols <= 1);
82a7c049 1774 WARN_ON(manual_val < master->minimum || manual_val > master->maximum);
5626b8c7 1775 WARN_ON(set_volatile && !has_op(master, g_volatile_ctrl));
72d877ca 1776 master->is_auto = true;
5626b8c7 1777 master->has_volatiles = set_volatile;
72d877ca
HV		 1778 master->manual_mode_value = manual_val;
1779 master->flags |= V4L2_CTRL_FLAG_UPDATE;
5626b8c7
HV		 1780
1781 if (!is_cur_manual(master))
1782 flag = V4L2_CTRL_FLAG_INACTIVE |
1783 (set_volatile ? V4L2_CTRL_FLAG_VOLATILE : 0);
72d877ca
HV		 1784
1785 for (i = 1; i < ncontrols; i++)
88365105 1786 if (controls[i])
72d877ca 1787 controls[i]->flags |= flag;
72d877ca
HV		 1788}
1789EXPORT_SYMBOL(v4l2_ctrl_auto_cluster);
1790
0996517c
HV		 1791/* Activate/deactivate a control. */
1792void v4l2_ctrl_activate(struct v4l2_ctrl *ctrl, bool active)
1793{
6e239399
HV		 1794 /* invert since the actual flag is called 'inactive' */
1795 bool inactive = !active;
1796 bool old;
1797
0996517c
HV		 1798 if (ctrl == NULL)
1799 return;
1800
6e239399 1801 if (inactive)
0996517c 1802 /* set V4L2_CTRL_FLAG_INACTIVE */
6e239399 1803 old = test_and_set_bit(4, &ctrl->flags);
0996517c
HV		 1804 else
1805 /* clear V4L2_CTRL_FLAG_INACTIVE */
6e239399
HV		 1806 old = test_and_clear_bit(4, &ctrl->flags);
1807 if (old != inactive)
1808 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_FLAGS);
0996517c
HV		 1809}
1810EXPORT_SYMBOL(v4l2_ctrl_activate);
1811
1812/* Grab/ungrab a control.
1813 Typically used when streaming starts and you want to grab controls,
1814 preventing the user from changing them.
1815
1816 Just call this and the framework will block any attempts to change
1817 these controls. */
1818void v4l2_ctrl_grab(struct v4l2_ctrl *ctrl, bool grabbed)
1819{
6e239399
HV		 1820 bool old;
1821
0996517c
HV		 1822 if (ctrl == NULL)
1823 return;
1824
6e239399 1825 v4l2_ctrl_lock(ctrl);
0996517c
HV		 1826 if (grabbed)
1827 /* set V4L2_CTRL_FLAG_GRABBED */
6e239399 1828 old = test_and_set_bit(1, &ctrl->flags);
0996517c
HV		 1829 else
1830 /* clear V4L2_CTRL_FLAG_GRABBED */
6e239399
HV		 1831 old = test_and_clear_bit(1, &ctrl->flags);
1832 if (old != grabbed)
1833 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_FLAGS);
1834 v4l2_ctrl_unlock(ctrl);
0996517c
HV		 1835}
1836EXPORT_SYMBOL(v4l2_ctrl_grab);
1837
1838/* Log the control name and value */
1839static void log_ctrl(const struct v4l2_ctrl *ctrl,
1840 const char *prefix, const char *colon)
1841{
0996517c
HV		 1842 if (ctrl->flags & (V4L2_CTRL_FLAG_DISABLED | V4L2_CTRL_FLAG_WRITE_ONLY))
1843 return;
1844 if (ctrl->type == V4L2_CTRL_TYPE_CTRL_CLASS)
1845 return;
1846
1847 printk(KERN_INFO "%s%s%s: ", prefix, colon, ctrl->name);
1848
1849 switch (ctrl->type) {
1850 case V4L2_CTRL_TYPE_INTEGER:
1851 printk(KERN_CONT "%d", ctrl->cur.val);
1852 break;
1853 case V4L2_CTRL_TYPE_BOOLEAN:
1854 printk(KERN_CONT "%s", ctrl->cur.val ? "true" : "false");
1855 break;
1856 case V4L2_CTRL_TYPE_MENU:
1857 printk(KERN_CONT "%s", ctrl->qmenu[ctrl->cur.val]);
1858 break;
ce580fe5
SA		 1859 case V4L2_CTRL_TYPE_INTEGER_MENU:
1860 printk(KERN_CONT "%lld", ctrl->qmenu_int[ctrl->cur.val]);
1861 break;
fa4d7096
HV		 1862 case V4L2_CTRL_TYPE_BITMASK:
1863 printk(KERN_CONT "0x%08x", ctrl->cur.val);
1864 break;
0996517c
HV		 1865 case V4L2_CTRL_TYPE_INTEGER64:
1866 printk(KERN_CONT "%lld", ctrl->cur.val64);
1867 break;
1868 case V4L2_CTRL_TYPE_STRING:
1869 printk(KERN_CONT "%s", ctrl->cur.string);
1870 break;
1871 default:
1872 printk(KERN_CONT "unknown type %d", ctrl->type);
1873 break;
1874 }
88365105
HV		 1875 if (ctrl->flags & (V4L2_CTRL_FLAG_INACTIVE |
1876 V4L2_CTRL_FLAG_GRABBED |
1877 V4L2_CTRL_FLAG_VOLATILE)) {
1878 if (ctrl->flags & V4L2_CTRL_FLAG_INACTIVE)
1879 printk(KERN_CONT " inactive");
1880 if (ctrl->flags & V4L2_CTRL_FLAG_GRABBED)
1881 printk(KERN_CONT " grabbed");
1882 if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE)
1883 printk(KERN_CONT " volatile");
1884 }
1885 printk(KERN_CONT "\n");
0996517c
HV		 1886}
1887
1888/* Log all controls owned by the handler */
1889void v4l2_ctrl_handler_log_status(struct v4l2_ctrl_handler *hdl,
1890 const char *prefix)
1891{
1892 struct v4l2_ctrl *ctrl;
1893 const char *colon = "";
1894 int len;
1895
1896 if (hdl == NULL)
1897 return;
1898 if (prefix == NULL)
1899 prefix = "";
1900 len = strlen(prefix);
1901 if (len && prefix[len - 1] != ' ')
1902 colon = ": ";
77e7c4e6 1903 mutex_lock(hdl->lock);
0996517c
HV		 1904 list_for_each_entry(ctrl, &hdl->ctrls, node)
1905 if (!(ctrl->flags & V4L2_CTRL_FLAG_DISABLED))
1906 log_ctrl(ctrl, prefix, colon);
77e7c4e6 1907 mutex_unlock(hdl->lock);
0996517c
HV		 1908}
1909EXPORT_SYMBOL(v4l2_ctrl_handler_log_status);
1910
1911/* Call s_ctrl for all controls owned by the handler */
1912int v4l2_ctrl_handler_setup(struct v4l2_ctrl_handler *hdl)
1913{
1914 struct v4l2_ctrl *ctrl;
1915 int ret = 0;
1916
1917 if (hdl == NULL)
1918 return 0;
77e7c4e6 1919 mutex_lock(hdl->lock);
0996517c
HV		 1920 list_for_each_entry(ctrl, &hdl->ctrls, node)
1921 ctrl->done = false;
1922
1923 list_for_each_entry(ctrl, &hdl->ctrls, node) {
1924 struct v4l2_ctrl *master = ctrl->cluster[0];
1925 int i;
1926
1927 /* Skip if this control was already handled by a cluster. */
71c6c4c9
HV		 1928 /* Skip button controls and read-only controls. */
1929 if (ctrl->done || ctrl->type == V4L2_CTRL_TYPE_BUTTON ||
1930 (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY))
0996517c
HV		 1931 continue;
1932
2a863793
HV		 1933 for (i = 0; i < master->ncontrols; i++) {
1934 if (master->cluster[i]) {
1935 cur_to_new(master->cluster[i]);
1936 master->cluster[i]->is_new = 1;
71c6c4c9 1937 master->cluster[i]->done = true;
2a863793
HV		 1938 }
1939 }
54c911eb 1940 ret = call_op(master, s_ctrl);
0996517c
HV		 1941 if (ret)
1942 break;
0996517c 1943 }
77e7c4e6 1944 mutex_unlock(hdl->lock);
0996517c
HV		 1945 return ret;
1946}
1947EXPORT_SYMBOL(v4l2_ctrl_handler_setup);
1948
1949/* Implement VIDIOC_QUERYCTRL */
1950int v4l2_queryctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_queryctrl *qc)
1951{
1952 u32 id = qc->id & V4L2_CTRL_ID_MASK;
1953 struct v4l2_ctrl_ref *ref;
1954 struct v4l2_ctrl *ctrl;
1955
1956 if (hdl == NULL)
1957 return -EINVAL;
1958
77e7c4e6 1959 mutex_lock(hdl->lock);
0996517c
HV		 1960
1961 /* Try to find it */
1962 ref = find_ref(hdl, id);
1963
1964 if ((qc->id & V4L2_CTRL_FLAG_NEXT_CTRL) && !list_empty(&hdl->ctrl_refs)) {
1965 /* Find the next control with ID > qc->id */
1966
1967 /* Did we reach the end of the control list? */
1968 if (id >= node2id(hdl->ctrl_refs.prev)) {
1969 ref = NULL; /* Yes, so there is no next control */
1970 } else if (ref) {
1971 /* We found a control with the given ID, so just get
1972 the next one in the list. */
1973 ref = list_entry(ref->node.next, typeof(*ref), node);
1974 } else {
1975 /* No control with the given ID exists, so start
1976 searching for the next largest ID. We know there
1977 is one, otherwise the first 'if' above would have
1978 been true. */
1979 list_for_each_entry(ref, &hdl->ctrl_refs, node)
1980 if (id < ref->ctrl->id)
1981 break;
1982 }
1983 }
77e7c4e6 1984 mutex_unlock(hdl->lock);
0996517c
HV		 1985 if (!ref)
1986 return -EINVAL;
1987
1988 ctrl = ref->ctrl;
1989 memset(qc, 0, sizeof(*qc));
829fb2dc
HV		 1990 if (id >= V4L2_CID_PRIVATE_BASE)
1991 qc->id = id;
1992 else
1993 qc->id = ctrl->id;
0996517c
HV		 1994 strlcpy(qc->name, ctrl->name, sizeof(qc->name));
1995 qc->minimum = ctrl->minimum;
1996 qc->maximum = ctrl->maximum;
1997 qc->default_value = ctrl->default_value;
ce580fe5
SA		 1998 if (ctrl->type == V4L2_CTRL_TYPE_MENU
1999 || ctrl->type == V4L2_CTRL_TYPE_INTEGER_MENU)
0996517c
HV		 2000 qc->step = 1;
2001 else
2002 qc->step = ctrl->step;
2003 qc->flags = ctrl->flags;
2004 qc->type = ctrl->type;
2005 return 0;
2006}
2007EXPORT_SYMBOL(v4l2_queryctrl);
2008
2009int v4l2_subdev_queryctrl(struct v4l2_subdev *sd, struct v4l2_queryctrl *qc)
2010{
87a0c94c
HV		 2011 if (qc->id & V4L2_CTRL_FLAG_NEXT_CTRL)
2012 return -EINVAL;
0996517c
HV		 2013 return v4l2_queryctrl(sd->ctrl_handler, qc);
2014}
2015EXPORT_SYMBOL(v4l2_subdev_queryctrl);
2016
2017/* Implement VIDIOC_QUERYMENU */
2018int v4l2_querymenu(struct v4l2_ctrl_handler *hdl, struct v4l2_querymenu *qm)
2019{
2020 struct v4l2_ctrl *ctrl;
2021 u32 i = qm->index;
2022
2023 ctrl = v4l2_ctrl_find(hdl, qm->id);
2024 if (!ctrl)
2025 return -EINVAL;
2026
2027 qm->reserved = 0;
2028 /* Sanity checks */
ce580fe5
SA		 2029 switch (ctrl->type) {
2030 case V4L2_CTRL_TYPE_MENU:
2031 if (ctrl->qmenu == NULL)
2032 return -EINVAL;
2033 break;
2034 case V4L2_CTRL_TYPE_INTEGER_MENU:
2035 if (ctrl->qmenu_int == NULL)
2036 return -EINVAL;
2037 break;
2038 default:
2039 return -EINVAL;
2040 }
2041
2042 if (i < ctrl->minimum || i > ctrl->maximum)
0996517c 2043 return -EINVAL;
ce580fe5 2044
0996517c
HV		 2045 /* Use mask to see if this menu item should be skipped */
2046 if (ctrl->menu_skip_mask & (1 << i))
2047 return -EINVAL;
2048 /* Empty menu items should also be skipped */
ce580fe5
SA		 2049 if (ctrl->type == V4L2_CTRL_TYPE_MENU) {
2050 if (ctrl->qmenu[i] == NULL || ctrl->qmenu[i][0] == '\0')
2051 return -EINVAL;
2052 strlcpy(qm->name, ctrl->qmenu[i], sizeof(qm->name));
2053 } else {
2054 qm->value = ctrl->qmenu_int[i];
2055 }
0996517c
HV		 2056 return 0;
2057}
2058EXPORT_SYMBOL(v4l2_querymenu);
2059
2060int v4l2_subdev_querymenu(struct v4l2_subdev *sd, struct v4l2_querymenu *qm)
2061{
2062 return v4l2_querymenu(sd->ctrl_handler, qm);
2063}
2064EXPORT_SYMBOL(v4l2_subdev_querymenu);
2065
2066
2067
2068/* Some general notes on the atomic requirements of VIDIOC_G/TRY/S_EXT_CTRLS:
2069
2070 It is not a fully atomic operation, just best-effort only. After all, if
2071 multiple controls have to be set through multiple i2c writes (for example)
2072 then some initial writes may succeed while others fail. Thus leaving the
2073 system in an inconsistent state. The question is how much effort you are
2074 willing to spend on trying to make something atomic that really isn't.
2075
2076 From the point of view of an application the main requirement is that
2077 when you call VIDIOC_S_EXT_CTRLS and some values are invalid then an
2078 error should be returned without actually affecting any controls.
2079
2080 If all the values are correct, then it is acceptable to just give up
2081 in case of low-level errors.
2082
2083 It is important though that the application can tell when only a partial
2084 configuration was done. The way we do that is through the error_idx field
2085 of struct v4l2_ext_controls: if that is equal to the count field then no
2086 controls were affected. Otherwise all controls before that index were
2087 successful in performing their 'get' or 'set' operation, the control at
2088 the given index failed, and you don't know what happened with the controls
2089 after the failed one. Since if they were part of a control cluster they
2090 could have been successfully processed (if a cluster member was encountered
2091 at index < error_idx), they could have failed (if a cluster member was at
2092 error_idx), or they may not have been processed yet (if the first cluster
2093 member appeared after error_idx).
2094
2095 It is all fairly theoretical, though. In practice all you can do is to
2096 bail out. If error_idx == count, then it is an application bug. If
2097 error_idx < count then it is only an application bug if the error code was
2098 EBUSY. That usually means that something started streaming just when you
2099 tried to set the controls. In all other cases it is a driver/hardware
2100 problem and all you can do is to retry or bail out.
2101
2102 Note that these rules do not apply to VIDIOC_TRY_EXT_CTRLS: since that
2103 never modifies controls the error_idx is just set to whatever control
2104 has an invalid value.
2105 */
2106
2107/* Prepare for the extended g/s/try functions.
2108 Find the controls in the control array and do some basic checks. */
2109static int prepare_ext_ctrls(struct v4l2_ctrl_handler *hdl,
2110 struct v4l2_ext_controls *cs,
eb5b16ef 2111 struct v4l2_ctrl_helper *helpers)
0996517c 2112{
eb5b16ef
HV		 2113 struct v4l2_ctrl_helper *h;
2114 bool have_clusters = false;
0996517c
HV		 2115 u32 i;
2116
eb5b16ef 2117 for (i = 0, h = helpers; i < cs->count; i++, h++) {
0996517c 2118 struct v4l2_ext_control *c = &cs->controls[i];
eb5b16ef 2119 struct v4l2_ctrl_ref *ref;
0996517c
HV		 2120 struct v4l2_ctrl *ctrl;
2121 u32 id = c->id & V4L2_CTRL_ID_MASK;
2122
37cd3b73 2123 cs->error_idx = i;
0996517c
HV		 2124
2125 if (cs->ctrl_class && V4L2_CTRL_ID2CLASS(id) != cs->ctrl_class)
2126 return -EINVAL;
2127
2128 /* Old-style private controls are not allowed for
2129 extended controls */
2130 if (id >= V4L2_CID_PRIVATE_BASE)
2131 return -EINVAL;
eb5b16ef
HV		 2132 ref = find_ref_lock(hdl, id);
2133 if (ref == NULL)
0996517c 2134 return -EINVAL;
eb5b16ef 2135 ctrl = ref->ctrl;
0996517c
HV		 2136 if (ctrl->flags & V4L2_CTRL_FLAG_DISABLED)
2137 return -EINVAL;
2138
eb5b16ef
HV		 2139 if (ctrl->cluster[0]->ncontrols > 1)
2140 have_clusters = true;
2141 if (ctrl->cluster[0] != ctrl)
2142 ref = find_ref_lock(hdl, ctrl->cluster[0]->id);
2143 /* Store the ref to the master control of the cluster */
2144 h->mref = ref;
2145 h->ctrl = ctrl;
2146 /* Initially set next to 0, meaning that there is no other
2147 control in this helper array belonging to the same
2148 cluster */
2149 h->next = 0;
0996517c 2150 }
0996517c 2151
eb5b16ef
HV		 2152 /* We are done if there were no controls that belong to a multi-
2153 control cluster. */
2154 if (!have_clusters)
2155 return 0;
0996517c 2156
eb5b16ef
HV		 2157 /* The code below figures out in O(n) time which controls in the list
2158 belong to the same cluster. */
0996517c 2159
eb5b16ef 2160 /* This has to be done with the handler lock taken. */
77e7c4e6 2161 mutex_lock(hdl->lock);
0996517c 2162
eb5b16ef
HV		 2163 /* First zero the helper field in the master control references */
2164 for (i = 0; i < cs->count; i++)
c082266f 2165 helpers[i].mref->helper = NULL;
eb5b16ef
HV		 2166 for (i = 0, h = helpers; i < cs->count; i++, h++) {
2167 struct v4l2_ctrl_ref *mref = h->mref;
2168
2169 /* If the mref->helper is set, then it points to an earlier
2170 helper that belongs to the same cluster. */
2171 if (mref->helper) {
2172 /* Set the next field of mref->helper to the current
2173 index: this means that that earlier helper now
2174 points to the next helper in the same cluster. */
2175 mref->helper->next = i;
2176 /* mref should be set only for the first helper in the
2177 cluster, clear the others. */
2178 h->mref = NULL;
2179 }
2180 /* Point the mref helper to the current helper struct. */
2181 mref->helper = h;
0996517c 2182 }
77e7c4e6 2183 mutex_unlock(hdl->lock);
eb5b16ef 2184 return 0;
0996517c
HV		 2185}
2186
2187/* Handles the corner case where cs->count == 0. It checks whether the
2188 specified control class exists. If that class ID is 0, then it checks
2189 whether there are any controls at all. */
2190static int class_check(struct v4l2_ctrl_handler *hdl, u32 ctrl_class)
2191{
2192 if (ctrl_class == 0)
2193 return list_empty(&hdl->ctrl_refs) ? -EINVAL : 0;
2194 return find_ref_lock(hdl, ctrl_class | 1) ? 0 : -EINVAL;
2195}
2196
2197
2198
2199/* Get extended controls. Allocates the helpers array if needed. */
2200int v4l2_g_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *cs)
2201{
eb5b16ef
HV		 2202 struct v4l2_ctrl_helper helper[4];
2203 struct v4l2_ctrl_helper *helpers = helper;
0996517c 2204 int ret;
ddac5c10 2205 int i, j;
0996517c
HV		 2206
2207 cs->error_idx = cs->count;
2208 cs->ctrl_class = V4L2_CTRL_ID2CLASS(cs->ctrl_class);
2209
2210 if (hdl == NULL)
2211 return -EINVAL;
2212
2213 if (cs->count == 0)
2214 return class_check(hdl, cs->ctrl_class);
2215
2216 if (cs->count > ARRAY_SIZE(helper)) {
5f0049bd
XW		 2217 helpers = kmalloc_array(cs->count, sizeof(helper[0]),
2218 GFP_KERNEL);
0996517c
HV		 2219 if (helpers == NULL)
2220 return -ENOMEM;
2221 }
2222
37cd3b73
HV		 2223 ret = prepare_ext_ctrls(hdl, cs, helpers);
2224 cs->error_idx = cs->count;
0996517c
HV		 2225
2226 for (i = 0; !ret && i < cs->count; i++)
2227 if (helpers[i].ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY)
2228 ret = -EACCES;
2229
2230 for (i = 0; !ret && i < cs->count; i++) {
eb5b16ef
HV		 2231 int (*ctrl_to_user)(struct v4l2_ext_control *c,
2232 struct v4l2_ctrl *ctrl) = cur_to_user;
2233 struct v4l2_ctrl *master;
0996517c 2234
eb5b16ef 2235 if (helpers[i].mref == NULL)
0996517c
HV		 2236 continue;
2237
eb5b16ef 2238 master = helpers[i].mref->ctrl;
0996517c
HV		 2239 cs->error_idx = i;
2240
2241 v4l2_ctrl_lock(master);
ddac5c10
HV		 2242
2243 /* g_volatile_ctrl will update the new control values */
5626b8c7
HV		 2244 if ((master->flags & V4L2_CTRL_FLAG_VOLATILE) ||
2245 (master->has_volatiles && !is_cur_manual(master))) {
ddac5c10
HV		 2246 for (j = 0; j < master->ncontrols; j++)
2247 cur_to_new(master->cluster[j]);
54c911eb 2248 ret = call_op(master, g_volatile_ctrl);
eb5b16ef 2249 ctrl_to_user = new_to_user;
ddac5c10
HV		 2250 }
2251 /* If OK, then copy the current (for non-volatile controls)
2252 or the new (for volatile controls) control values to the
2253 caller */
eb5b16ef
HV		 2254 if (!ret) {
2255 u32 idx = i;
2256
2257 do {
2258 ret = ctrl_to_user(cs->controls + idx,
2259 helpers[idx].ctrl);
2260 idx = helpers[idx].next;
2261 } while (!ret && idx);
2262 }
0996517c 2263 v4l2_ctrl_unlock(master);
0996517c
HV		 2264 }
2265
2266 if (cs->count > ARRAY_SIZE(helper))
2267 kfree(helpers);
2268 return ret;
2269}
2270EXPORT_SYMBOL(v4l2_g_ext_ctrls);
2271
2272int v4l2_subdev_g_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs)
2273{
2274 return v4l2_g_ext_ctrls(sd->ctrl_handler, cs);
2275}
2276EXPORT_SYMBOL(v4l2_subdev_g_ext_ctrls);
2277
2278/* Helper function to get a single control */
03d5285b 2279static int get_ctrl(struct v4l2_ctrl *ctrl, struct v4l2_ext_control *c)
0996517c
HV		 2280{
2281 struct v4l2_ctrl *master = ctrl->cluster[0];
2282 int ret = 0;
ddac5c10 2283 int i;
0996517c 2284
03d5285b
LP		 2285 /* String controls are not supported. The new_to_user() and
2286 * cur_to_user() calls below would need to be modified not to access
2287 * userspace memory when called from get_ctrl().
2288 */
2289 if (ctrl->type == V4L2_CTRL_TYPE_STRING)
2290 return -EINVAL;
2291
0996517c
HV		 2292 if (ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY)
2293 return -EACCES;
2294
2295 v4l2_ctrl_lock(master);
2296 /* g_volatile_ctrl will update the current control values */
5626b8c7 2297 if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE) {
ddac5c10
HV		 2298 for (i = 0; i < master->ncontrols; i++)
2299 cur_to_new(master->cluster[i]);
54c911eb 2300 ret = call_op(master, g_volatile_ctrl);
03d5285b 2301 new_to_user(c, ctrl);
ddac5c10 2302 } else {
03d5285b 2303 cur_to_user(c, ctrl);
ddac5c10 2304 }
0996517c
HV		 2305 v4l2_ctrl_unlock(master);
2306 return ret;
2307}
2308
2309int v4l2_g_ctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_control *control)
2310{
2311 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, control->id);
03d5285b
LP		 2312 struct v4l2_ext_control c;
2313 int ret;
0996517c
HV		 2314
2315 if (ctrl == NULL || !type_is_int(ctrl))
2316 return -EINVAL;
03d5285b
LP		 2317 ret = get_ctrl(ctrl, &c);
2318 control->value = c.value;
2319 return ret;
0996517c
HV		 2320}
2321EXPORT_SYMBOL(v4l2_g_ctrl);
2322
2323int v4l2_subdev_g_ctrl(struct v4l2_subdev *sd, struct v4l2_control *control)
2324{
2325 return v4l2_g_ctrl(sd->ctrl_handler, control);
2326}
2327EXPORT_SYMBOL(v4l2_subdev_g_ctrl);
2328
2329s32 v4l2_ctrl_g_ctrl(struct v4l2_ctrl *ctrl)
2330{
03d5285b 2331 struct v4l2_ext_control c;
0996517c
HV		 2332
2333 /* It's a driver bug if this happens. */
2334 WARN_ON(!type_is_int(ctrl));
03d5285b
LP		 2335 c.value = 0;
2336 get_ctrl(ctrl, &c);
2337 return c.value;
0996517c
HV		 2338}
2339EXPORT_SYMBOL(v4l2_ctrl_g_ctrl);
2340
03d5285b
LP		 2341s64 v4l2_ctrl_g_ctrl_int64(struct v4l2_ctrl *ctrl)
2342{
2343 struct v4l2_ext_control c;
2344
2345 /* It's a driver bug if this happens. */
2346 WARN_ON(ctrl->type != V4L2_CTRL_TYPE_INTEGER64);
2347 c.value = 0;
2348 get_ctrl(ctrl, &c);
2349 return c.value;
2350}
2351EXPORT_SYMBOL(v4l2_ctrl_g_ctrl_int64);
2352
0996517c
HV		 2353
2354/* Core function that calls try/s_ctrl and ensures that the new value is
2355 copied to the current value on a set.
2356 Must be called with ctrl->handler->lock held. */
e6402585
HV		 2357static int try_or_set_cluster(struct v4l2_fh *fh,
2358 struct v4l2_ctrl *master, bool set)
0996517c 2359{
72d877ca 2360 bool update_flag;
eb5b16ef 2361 int ret;
0996517c
HV		 2362 int i;
2363
2364 /* Go through the cluster and either validate the new value or
2365 (if no new value was set), copy the current value to the new
2366 value, ensuring a consistent view for the control ops when
2367 called. */
eb5b16ef 2368 for (i = 0; i < master->ncontrols; i++) {
0996517c
HV		 2369 struct v4l2_ctrl *ctrl = master->cluster[i];
2370
2371 if (ctrl == NULL)
2372 continue;
2373
eb5b16ef
HV		 2374 if (!ctrl->is_new) {
2375 cur_to_new(ctrl);
0996517c
HV		 2376 continue;
2377 }
eb5b16ef
HV		 2378 /* Check again: it may have changed since the
2379 previous check in try_or_set_ext_ctrls(). */
2380 if (set && (ctrl->flags & V4L2_CTRL_FLAG_GRABBED))
2381 return -EBUSY;
0996517c
HV		 2382 }
2383
eb5b16ef 2384 ret = call_op(master, try_ctrl);
0996517c
HV		 2385
2386 /* Don't set if there is no change */
72d877ca
HV		 2387 if (ret || !set || !cluster_changed(master))
2388 return ret;
2389 ret = call_op(master, s_ctrl);
72d877ca
HV		 2390 if (ret)
2391 return ret;
2392
eb5b16ef 2393 /* If OK, then make the new values permanent. */
72d877ca
HV		 2394 update_flag = is_cur_manual(master) != is_new_manual(master);
2395 for (i = 0; i < master->ncontrols; i++)
ab892bac 2396 new_to_cur(fh, master->cluster[i], update_flag && i > 0);
72d877ca 2397 return 0;
0996517c
HV		 2398}
2399
e6402585
HV		 2400/* Validate controls. */
2401static int validate_ctrls(struct v4l2_ext_controls *cs,
2402 struct v4l2_ctrl_helper *helpers, bool set)
0996517c 2403{
e6402585 2404 unsigned i;
0996517c
HV		 2405 int ret = 0;
2406
eb5b16ef 2407 cs->error_idx = cs->count;
0996517c
HV		 2408 for (i = 0; i < cs->count; i++) {
2409 struct v4l2_ctrl *ctrl = helpers[i].ctrl;
2410
e6402585 2411 cs->error_idx = i;
0996517c
HV		 2412
2413 if (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY)
2414 return -EACCES;
2415 /* This test is also done in try_set_control_cluster() which
2416 is called in atomic context, so that has the final say,
2417 but it makes sense to do an up-front check as well. Once
2418 an error occurs in try_set_control_cluster() some other
2419 controls may have been set already and we want to do a
2420 best-effort to avoid that. */
2421 if (set && (ctrl->flags & V4L2_CTRL_FLAG_GRABBED))
2422 return -EBUSY;
eb5b16ef
HV		 2423 ret = validate_new(ctrl, &cs->controls[i]);
2424 if (ret)
2425 return ret;
0996517c 2426 }
e6402585
HV		 2427 return 0;
2428}
2429
5626b8c7
HV		 2430/* Obtain the current volatile values of an autocluster and mark them
2431 as new. */
2432static void update_from_auto_cluster(struct v4l2_ctrl *master)
2433{
2434 int i;
2435
2436 for (i = 0; i < master->ncontrols; i++)
2437 cur_to_new(master->cluster[i]);
2438 if (!call_op(master, g_volatile_ctrl))
2439 for (i = 1; i < master->ncontrols; i++)
2440 if (master->cluster[i])
2441 master->cluster[i]->is_new = 1;
2442}
2443
e6402585
HV		 2444/* Try or try-and-set controls */
2445static int try_set_ext_ctrls(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
2446 struct v4l2_ext_controls *cs,
2447 bool set)
2448{
2449 struct v4l2_ctrl_helper helper[4];
2450 struct v4l2_ctrl_helper *helpers = helper;
2451 unsigned i, j;
2452 int ret;
2453
2454 cs->error_idx = cs->count;
2455 cs->ctrl_class = V4L2_CTRL_ID2CLASS(cs->ctrl_class);
2456
2457 if (hdl == NULL)
2458 return -EINVAL;
2459
2460 if (cs->count == 0)
2461 return class_check(hdl, cs->ctrl_class);
0996517c 2462
e6402585 2463 if (cs->count > ARRAY_SIZE(helper)) {
0a3475eb
XW		 2464 helpers = kmalloc_array(cs->count, sizeof(helper[0]),
2465 GFP_KERNEL);
e6402585
HV		 2466 if (!helpers)
2467 return -ENOMEM;
2468 }
2469 ret = prepare_ext_ctrls(hdl, cs, helpers);
2470 if (!ret)
2471 ret = validate_ctrls(cs, helpers, set);
2472 if (ret && set)
2473 cs->error_idx = cs->count;
0996517c 2474 for (i = 0; !ret && i < cs->count; i++) {
eb5b16ef
HV		 2475 struct v4l2_ctrl *master;
2476 u32 idx = i;
0996517c 2477
eb5b16ef 2478 if (helpers[i].mref == NULL)
0996517c
HV		 2479 continue;
2480
37cd3b73 2481 cs->error_idx = i;
eb5b16ef
HV		 2482 master = helpers[i].mref->ctrl;
2483 v4l2_ctrl_lock(master);
0996517c 2484
2a863793 2485 /* Reset the 'is_new' flags of the cluster */
0996517c
HV		 2486 for (j = 0; j < master->ncontrols; j++)
2487 if (master->cluster[j])
2a863793 2488 master->cluster[j]->is_new = 0;
0996517c 2489
5626b8c7
HV		 2490 /* For volatile autoclusters that are currently in auto mode
2491 we need to discover if it will be set to manual mode.
2492 If so, then we have to copy the current volatile values
2493 first since those will become the new manual values (which
2494 may be overwritten by explicit new values from this set
2495 of controls). */
2496 if (master->is_auto && master->has_volatiles &&
2497 !is_cur_manual(master)) {
2498 /* Pick an initial non-manual value */
2499 s32 new_auto_val = master->manual_mode_value + 1;
2500 u32 tmp_idx = idx;
2501
2502 do {
2503 /* Check if the auto control is part of the
2504 list, and remember the new value. */
2505 if (helpers[tmp_idx].ctrl == master)
2506 new_auto_val = cs->controls[tmp_idx].value;
2507 tmp_idx = helpers[tmp_idx].next;
2508 } while (tmp_idx);
2509 /* If the new value == the manual value, then copy
2510 the current volatile values. */
2511 if (new_auto_val == master->manual_mode_value)
2512 update_from_auto_cluster(master);
2513 }
2514
0996517c 2515 /* Copy the new caller-supplied control values.
2a863793 2516 user_to_new() sets 'is_new' to 1. */
eb5b16ef
HV		 2517 do {
2518 ret = user_to_new(cs->controls + idx, helpers[idx].ctrl);
2519 idx = helpers[idx].next;
2520 } while (!ret && idx);
0996517c
HV		 2521
2522 if (!ret)
e6402585 2523 ret = try_or_set_cluster(fh, master, set);
0996517c
HV		 2524
2525 /* Copy the new values back to userspace. */
eb5b16ef
HV		 2526 if (!ret) {
2527 idx = i;
2528 do {
adf41b9b 2529 ret = new_to_user(cs->controls + idx,
e6402585 2530 helpers[idx].ctrl);
eb5b16ef
HV		 2531 idx = helpers[idx].next;
2532 } while (!ret && idx);
2533 }
2534 v4l2_ctrl_unlock(master);
0996517c 2535 }
0996517c 2536
0996517c
HV		 2537 if (cs->count > ARRAY_SIZE(helper))
2538 kfree(helpers);
2539 return ret;
2540}
2541
2542int v4l2_try_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *cs)
2543{
ab892bac 2544 return try_set_ext_ctrls(NULL, hdl, cs, false);
0996517c
HV		 2545}
2546EXPORT_SYMBOL(v4l2_try_ext_ctrls);
2547
ab892bac
HV		 2548int v4l2_s_ext_ctrls(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
2549 struct v4l2_ext_controls *cs)
0996517c 2550{
ab892bac 2551 return try_set_ext_ctrls(fh, hdl, cs, true);
0996517c
HV		 2552}
2553EXPORT_SYMBOL(v4l2_s_ext_ctrls);
2554
2555int v4l2_subdev_try_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs)
2556{
ab892bac 2557 return try_set_ext_ctrls(NULL, sd->ctrl_handler, cs, false);
0996517c
HV		 2558}
2559EXPORT_SYMBOL(v4l2_subdev_try_ext_ctrls);
2560
2561int v4l2_subdev_s_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs)
2562{
ab892bac 2563 return try_set_ext_ctrls(NULL, sd->ctrl_handler, cs, true);
0996517c
HV		 2564}
2565EXPORT_SYMBOL(v4l2_subdev_s_ext_ctrls);
2566
2567/* Helper function for VIDIOC_S_CTRL compatibility */
03d5285b
LP		 2568static int set_ctrl(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl,
2569 struct v4l2_ext_control *c)
0996517c
HV		 2570{
2571 struct v4l2_ctrl *master = ctrl->cluster[0];
2572 int ret;
2573 int i;
2574
03d5285b
LP		 2575 /* String controls are not supported. The user_to_new() and
2576 * cur_to_user() calls below would need to be modified not to access
2577 * userspace memory when called from set_ctrl().
2578 */
2579 if (ctrl->type == V4L2_CTRL_TYPE_STRING)
2580 return -EINVAL;
2581
2582 ret = validate_new(ctrl, c);
eb5b16ef
HV		 2583 if (ret)
2584 return ret;
2585
0996517c
HV		 2586 v4l2_ctrl_lock(ctrl);
2587
2a863793 2588 /* Reset the 'is_new' flags of the cluster */
0996517c
HV		 2589 for (i = 0; i < master->ncontrols; i++)
2590 if (master->cluster[i])
2a863793 2591 master->cluster[i]->is_new = 0;
0996517c 2592
5626b8c7
HV		 2593 /* For autoclusters with volatiles that are switched from auto to
2594 manual mode we have to update the current volatile values since
2595 those will become the initial manual values after such a switch. */
2596 if (master->is_auto && master->has_volatiles && ctrl == master &&
03d5285b 2597 !is_cur_manual(master) && c->value == master->manual_mode_value)
5626b8c7 2598 update_from_auto_cluster(master);
03d5285b
LP		 2599
2600 user_to_new(c, ctrl);
e6402585 2601 ret = try_or_set_cluster(fh, master, true);
03d5285b
LP		 2602 cur_to_user(c, ctrl);
2603
0996517c
HV		 2604 v4l2_ctrl_unlock(ctrl);
2605 return ret;
2606}
2607
ab892bac
HV		 2608int v4l2_s_ctrl(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
2609 struct v4l2_control *control)
0996517c
HV		 2610{
2611 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, control->id);
03d5285b
LP		 2612 struct v4l2_ext_control c;
2613 int ret;
0996517c
HV		 2614
2615 if (ctrl == NULL || !type_is_int(ctrl))
2616 return -EINVAL;
2617
7ebbc39f
HV		 2618 if (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY)
2619 return -EACCES;
2620
03d5285b
LP		 2621 c.value = control->value;
2622 ret = set_ctrl(fh, ctrl, &c);
2623 control->value = c.value;
2624 return ret;
0996517c
HV		 2625}
2626EXPORT_SYMBOL(v4l2_s_ctrl);
2627
2628int v4l2_subdev_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *control)
2629{
ab892bac 2630 return v4l2_s_ctrl(NULL, sd->ctrl_handler, control);
0996517c
HV		 2631}
2632EXPORT_SYMBOL(v4l2_subdev_s_ctrl);
2633
2634int v4l2_ctrl_s_ctrl(struct v4l2_ctrl *ctrl, s32 val)
2635{
03d5285b
LP		 2636 struct v4l2_ext_control c;
2637
0996517c
HV		 2638 /* It's a driver bug if this happens. */
2639 WARN_ON(!type_is_int(ctrl));
03d5285b
LP		 2640 c.value = val;
2641 return set_ctrl(NULL, ctrl, &c);
0996517c
HV		 2642}
2643EXPORT_SYMBOL(v4l2_ctrl_s_ctrl);
6e239399 2644
03d5285b
LP		 2645int v4l2_ctrl_s_ctrl_int64(struct v4l2_ctrl *ctrl, s64 val)
2646{
2647 struct v4l2_ext_control c;
2648
2649 /* It's a driver bug if this happens. */
2650 WARN_ON(ctrl->type != V4L2_CTRL_TYPE_INTEGER64);
2651 c.value64 = val;
2652 return set_ctrl(NULL, ctrl, &c);
2653}
2654EXPORT_SYMBOL(v4l2_ctrl_s_ctrl_int64);
2655
6e6d76cd 2656static int v4l2_ctrl_add_event(struct v4l2_subscribed_event *sev, unsigned elems)
6e239399 2657{
3e366149
HG		 2658 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(sev->fh->ctrl_handler, sev->id);
2659
2660 if (ctrl == NULL)
2661 return -EINVAL;
2662
6e239399 2663 v4l2_ctrl_lock(ctrl);
77068d36 2664 list_add_tail(&sev->node, &ctrl->ev_subs);
6e239399 2665 if (ctrl->type != V4L2_CTRL_TYPE_CTRL_CLASS &&
77068d36 2666 (sev->flags & V4L2_EVENT_SUB_FL_SEND_INITIAL)) {
6e239399 2667 struct v4l2_event ev;
c12fcfd6 2668 u32 changes = V4L2_EVENT_CTRL_CH_FLAGS;
6e239399 2669
c12fcfd6
HV		 2670 if (!(ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY))
2671 changes |= V4L2_EVENT_CTRL_CH_VALUE;
2672 fill_event(&ev, ctrl, changes);
6e6d76cd
HV		 2673 /* Mark the queue as active, allowing this initial
2674 event to be accepted. */
2675 sev->elems = elems;
77068d36 2676 v4l2_event_queue_fh(sev->fh, &ev);
6e239399
HV		 2677 }
2678 v4l2_ctrl_unlock(ctrl);
3e366149 2679 return 0;
6e239399 2680}
6e239399 2681
3e366149 2682static void v4l2_ctrl_del_event(struct v4l2_subscribed_event *sev)
6e239399 2683{
3e366149
HG		 2684 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(sev->fh->ctrl_handler, sev->id);
2685
6e239399 2686 v4l2_ctrl_lock(ctrl);
77068d36 2687 list_del(&sev->node);
6e239399
HV		 2688 v4l2_ctrl_unlock(ctrl);
2689}
3e366149
HG		 2690
2691void v4l2_ctrl_replace(struct v4l2_event *old, const struct v4l2_event *new)
2692{
2693 u32 old_changes = old->u.ctrl.changes;
2694
2695 old->u.ctrl = new->u.ctrl;
2696 old->u.ctrl.changes |= old_changes;
2697}
2698EXPORT_SYMBOL(v4l2_ctrl_replace);
2699
2700void v4l2_ctrl_merge(const struct v4l2_event *old, struct v4l2_event *new)
2701{
2702 new->u.ctrl.changes |= old->u.ctrl.changes;
2703}
2704EXPORT_SYMBOL(v4l2_ctrl_merge);
2705
2706const struct v4l2_subscribed_event_ops v4l2_ctrl_sub_ev_ops = {
2707 .add = v4l2_ctrl_add_event,
2708 .del = v4l2_ctrl_del_event,
2709 .replace = v4l2_ctrl_replace,
2710 .merge = v4l2_ctrl_merge,
2711};
2712EXPORT_SYMBOL(v4l2_ctrl_sub_ev_ops);
e2ecb257
HV		 2713
2714int v4l2_ctrl_log_status(struct file *file, void *fh)
2715{
2716 struct video_device *vfd = video_devdata(file);
2717 struct v4l2_fh *vfh = file->private_data;
2718
2719 if (test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags) && vfd->v4l2_dev)
2720 v4l2_ctrl_handler_log_status(vfh->ctrl_handler,
2721 vfd->v4l2_dev->name);
2722 return 0;
2723}
2724EXPORT_SYMBOL(v4l2_ctrl_log_status);
a26243b0
HV		 2725
2726int v4l2_ctrl_subscribe_event(struct v4l2_fh *fh,
85f5fe39 2727 const struct v4l2_event_subscription *sub)
a26243b0
HV		 2728{
2729 if (sub->type == V4L2_EVENT_CTRL)
3e366149 2730 return v4l2_event_subscribe(fh, sub, 0, &v4l2_ctrl_sub_ev_ops);
a26243b0
HV		 2731 return -EINVAL;
2732}
2733EXPORT_SYMBOL(v4l2_ctrl_subscribe_event);
2734
2735unsigned int v4l2_ctrl_poll(struct file *file, struct poll_table_struct *wait)
2736{
2737 struct v4l2_fh *fh = file->private_data;
2738
2739 if (v4l2_event_pending(fh))
2740 return POLLPRI;
2741 poll_wait(file, &fh->wait, wait);
2742 return 0;
2743}
2744EXPORT_SYMBOL(v4l2_ctrl_poll);
Linux 6.x block layer and io_uring tree(s)