projects / linux-block.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
[media] videodev2.h: add V4L2_CTRL_FLAG_VOLATILE
[linux-block.git] / drivers / media / video / 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>
0996517c
HV		 23#include <media/v4l2-ioctl.h>
24#include <media/v4l2-device.h>
25#include <media/v4l2-ctrls.h>
6e239399 26#include <media/v4l2-event.h>
0996517c
HV		 27#include <media/v4l2-dev.h>
28
ddac5c10
HV		 29#define has_op(master, op) \
30 (master->ops && master->ops->op)
54c911eb 31#define call_op(master, op) \
ddac5c10 32 (has_op(master, op) ? master->ops->op(master) : 0)
54c911eb 33
0996517c 34/* Internal temporary helper struct, one for each v4l2_ext_control */
eb5b16ef
HV		 35struct v4l2_ctrl_helper {
36 /* Pointer to the control reference of the master control */
37 struct v4l2_ctrl_ref *mref;
0996517c
HV		 38 /* The control corresponding to the v4l2_ext_control ID field. */
39 struct v4l2_ctrl *ctrl;
eb5b16ef
HV		 40 /* v4l2_ext_control index of the next control belonging to the
41 same cluster, or 0 if there isn't any. */
42 u32 next;
0996517c
HV		 43};
44
72d877ca
HV		 45/* Small helper function to determine if the autocluster is set to manual
46 mode. In that case the is_volatile flag should be ignored. */
47static bool is_cur_manual(const struct v4l2_ctrl *master)
48{
49 return master->is_auto && master->cur.val == master->manual_mode_value;
50}
51
52/* Same as above, but this checks the against the new value instead of the
53 current value. */
54static bool is_new_manual(const struct v4l2_ctrl *master)
55{
56 return master->is_auto && master->val == master->manual_mode_value;
57}
58
0996517c
HV		 59/* Returns NULL or a character pointer array containing the menu for
60 the given control ID. The pointer array ends with a NULL pointer.
61 An empty string signifies a menu entry that is invalid. This allows
62 drivers to disable certain options if it is not supported. */
513521ea 63const char * const *v4l2_ctrl_get_menu(u32 id)
0996517c 64{
513521ea 65 static const char * const mpeg_audio_sampling_freq[] = {
0996517c
HV		 66 "44.1 kHz",
67 "48 kHz",
68 "32 kHz",
69 NULL
70 };
513521ea 71 static const char * const mpeg_audio_encoding[] = {
0996517c
HV		 72 "MPEG-1/2 Layer I",
73 "MPEG-1/2 Layer II",
74 "MPEG-1/2 Layer III",
75 "MPEG-2/4 AAC",
76 "AC-3",
77 NULL
78 };
513521ea 79 static const char * const mpeg_audio_l1_bitrate[] = {
0996517c
HV		 80 "32 kbps",
81 "64 kbps",
82 "96 kbps",
83 "128 kbps",
84 "160 kbps",
85 "192 kbps",
86 "224 kbps",
87 "256 kbps",
88 "288 kbps",
89 "320 kbps",
90 "352 kbps",
91 "384 kbps",
92 "416 kbps",
93 "448 kbps",
94 NULL
95 };
513521ea 96 static const char * const mpeg_audio_l2_bitrate[] = {
0996517c
HV		 97 "32 kbps",
98 "48 kbps",
99 "56 kbps",
100 "64 kbps",
101 "80 kbps",
102 "96 kbps",
103 "112 kbps",
104 "128 kbps",
105 "160 kbps",
106 "192 kbps",
107 "224 kbps",
108 "256 kbps",
109 "320 kbps",
110 "384 kbps",
111 NULL
112 };
513521ea 113 static const char * const mpeg_audio_l3_bitrate[] = {
0996517c
HV		 114 "32 kbps",
115 "40 kbps",
116 "48 kbps",
117 "56 kbps",
118 "64 kbps",
119 "80 kbps",
120 "96 kbps",
121 "112 kbps",
122 "128 kbps",
123 "160 kbps",
124 "192 kbps",
125 "224 kbps",
126 "256 kbps",
127 "320 kbps",
128 NULL
129 };
513521ea 130 static const char * const mpeg_audio_ac3_bitrate[] = {
0996517c
HV		 131 "32 kbps",
132 "40 kbps",
133 "48 kbps",
134 "56 kbps",
135 "64 kbps",
136 "80 kbps",
137 "96 kbps",
138 "112 kbps",
139 "128 kbps",
140 "160 kbps",
141 "192 kbps",
142 "224 kbps",
143 "256 kbps",
144 "320 kbps",
145 "384 kbps",
146 "448 kbps",
147 "512 kbps",
148 "576 kbps",
149 "640 kbps",
150 NULL
151 };
513521ea 152 static const char * const mpeg_audio_mode[] = {
0996517c
HV		 153 "Stereo",
154 "Joint Stereo",
155 "Dual",
156 "Mono",
157 NULL
158 };
513521ea 159 static const char * const mpeg_audio_mode_extension[] = {
0996517c
HV		 160 "Bound 4",
161 "Bound 8",
162 "Bound 12",
163 "Bound 16",
164 NULL
165 };
513521ea 166 static const char * const mpeg_audio_emphasis[] = {
0996517c
HV		 167 "No Emphasis",
168 "50/15 us",
169 "CCITT J17",
170 NULL
171 };
513521ea 172 static const char * const mpeg_audio_crc[] = {
0996517c
HV		 173 "No CRC",
174 "16-bit CRC",
175 NULL
176 };
513521ea 177 static const char * const mpeg_video_encoding[] = {
0996517c
HV		 178 "MPEG-1",
179 "MPEG-2",
180 "MPEG-4 AVC",
181 NULL
182 };
513521ea 183 static const char * const mpeg_video_aspect[] = {
0996517c
HV		 184 "1x1",
185 "4x3",
186 "16x9",
187 "2.21x1",
188 NULL
189 };
513521ea 190 static const char * const mpeg_video_bitrate_mode[] = {
0996517c
HV		 191 "Variable Bitrate",
192 "Constant Bitrate",
193 NULL
194 };
513521ea 195 static const char * const mpeg_stream_type[] = {
0996517c
HV		 196 "MPEG-2 Program Stream",
197 "MPEG-2 Transport Stream",
198 "MPEG-1 System Stream",
199 "MPEG-2 DVD-compatible Stream",
200 "MPEG-1 VCD-compatible Stream",
201 "MPEG-2 SVCD-compatible Stream",
202 NULL
203 };
513521ea 204 static const char * const mpeg_stream_vbi_fmt[] = {
0996517c 205 "No VBI",
064f5096 206 "Private Packet, IVTV Format",
0996517c
HV		 207 NULL
208 };
513521ea 209 static const char * const camera_power_line_frequency[] = {
0996517c
HV		 210 "Disabled",
211 "50 Hz",
212 "60 Hz",
213 NULL
214 };
513521ea 215 static const char * const camera_exposure_auto[] = {
0996517c
HV		 216 "Auto Mode",
217 "Manual Mode",
218 "Shutter Priority Mode",
219 "Aperture Priority Mode",
220 NULL
221 };
513521ea 222 static const char * const colorfx[] = {
0996517c
HV		 223 "None",
224 "Black & White",
225 "Sepia",
226 "Negative",
227 "Emboss",
228 "Sketch",
064f5096
KD		 229 "Sky Blue",
230 "Grass Green",
231 "Skin Whiten",
0996517c
HV		 232 "Vivid",
233 NULL
234 };
513521ea 235 static const char * const tune_preemphasis[] = {
064f5096 236 "No Preemphasis",
0996517c
HV		 237 "50 useconds",
238 "75 useconds",
239 NULL,
240 };
064f5096
KD		 241 static const char * const header_mode[] = {
242 "Separate Buffer",
243 "Joined With 1st Frame",
244 NULL,
245 };
246 static const char * const multi_slice[] = {
247 "Single",
248 "Max Macroblocks",
249 "Max Bytes",
250 NULL,
251 };
252 static const char * const entropy_mode[] = {
253 "CAVLC",
254 "CABAC",
255 NULL,
256 };
257 static const char * const mpeg_h264_level[] = {
258 "1",
259 "1b",
260 "1.1",
261 "1.2",
262 "1.3",
263 "2",
264 "2.1",
265 "2.2",
266 "3",
267 "3.1",
268 "3.2",
269 "4",
270 "4.1",
271 "4.2",
272 "5",
273 "5.1",
274 NULL,
275 };
276 static const char * const h264_loop_filter[] = {
277 "Enabled",
278 "Disabled",
279 "Disabled at Slice Boundary",
280 NULL,
281 };
282 static const char * const h264_profile[] = {
283 "Baseline",
284 "Constrained Baseline",
285 "Main",
286 "Extended",
287 "High",
288 "High 10",
289 "High 422",
290 "High 444 Predictive",
291 "High 10 Intra",
292 "High 422 Intra",
293 "High 444 Intra",
294 "CAVLC 444 Intra",
295 "Scalable Baseline",
296 "Scalable High",
297 "Scalable High Intra",
298 "Multiview High",
299 NULL,
300 };
301 static const char * const vui_sar_idc[] = {
302 "Unspecified",
303 "1:1",
304 "12:11",
305 "10:11",
306 "16:11",
307 "40:33",
308 "24:11",
309 "20:11",
310 "32:11",
311 "80:33",
312 "18:11",
313 "15:11",
314 "64:33",
315 "160:99",
316 "4:3",
317 "3:2",
318 "2:1",
319 "Extended SAR",
320 NULL,
321 };
322 static const char * const mpeg_mpeg4_level[] = {
323 "0",
324 "0b",
325 "1",
326 "2",
327 "3",
328 "3b",
329 "4",
330 "5",
331 NULL,
332 };
333 static const char * const mpeg4_profile[] = {
334 "Simple",
335 "Adcanved Simple",
336 "Core",
337 "Simple Scalable",
338 "Advanced Coding Efficency",
339 NULL,
340 };
341
0b159acd
SA		 342 static const char * const flash_led_mode[] = {
343 "Off",
344 "Flash",
345 "Torch",
346 NULL,
347 };
348 static const char * const flash_strobe_source[] = {
349 "Software",
350 "External",
351 NULL,
352 };
0996517c
HV		 353
354 switch (id) {
355 case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ:
356 return mpeg_audio_sampling_freq;
357 case V4L2_CID_MPEG_AUDIO_ENCODING:
358 return mpeg_audio_encoding;
359 case V4L2_CID_MPEG_AUDIO_L1_BITRATE:
360 return mpeg_audio_l1_bitrate;
361 case V4L2_CID_MPEG_AUDIO_L2_BITRATE:
362 return mpeg_audio_l2_bitrate;
363 case V4L2_CID_MPEG_AUDIO_L3_BITRATE:
364 return mpeg_audio_l3_bitrate;
365 case V4L2_CID_MPEG_AUDIO_AC3_BITRATE:
366 return mpeg_audio_ac3_bitrate;
367 case V4L2_CID_MPEG_AUDIO_MODE:
368 return mpeg_audio_mode;
369 case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION:
370 return mpeg_audio_mode_extension;
371 case V4L2_CID_MPEG_AUDIO_EMPHASIS:
372 return mpeg_audio_emphasis;
373 case V4L2_CID_MPEG_AUDIO_CRC:
374 return mpeg_audio_crc;
375 case V4L2_CID_MPEG_VIDEO_ENCODING:
376 return mpeg_video_encoding;
377 case V4L2_CID_MPEG_VIDEO_ASPECT:
378 return mpeg_video_aspect;
379 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
380 return mpeg_video_bitrate_mode;
381 case V4L2_CID_MPEG_STREAM_TYPE:
382 return mpeg_stream_type;
383 case V4L2_CID_MPEG_STREAM_VBI_FMT:
384 return mpeg_stream_vbi_fmt;
385 case V4L2_CID_POWER_LINE_FREQUENCY:
386 return camera_power_line_frequency;
387 case V4L2_CID_EXPOSURE_AUTO:
388 return camera_exposure_auto;
389 case V4L2_CID_COLORFX:
390 return colorfx;
391 case V4L2_CID_TUNE_PREEMPHASIS:
392 return tune_preemphasis;
0b159acd
SA		 393 case V4L2_CID_FLASH_LED_MODE:
394 return flash_led_mode;
395 case V4L2_CID_FLASH_STROBE_SOURCE:
396 return flash_strobe_source;
064f5096
KD		 397 case V4L2_CID_MPEG_VIDEO_HEADER_MODE:
398 return header_mode;
399 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE:
400 return multi_slice;
401 case V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE:
402 return entropy_mode;
403 case V4L2_CID_MPEG_VIDEO_H264_LEVEL:
404 return mpeg_h264_level;
405 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE:
406 return h264_loop_filter;
407 case V4L2_CID_MPEG_VIDEO_H264_PROFILE:
408 return h264_profile;
409 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC:
410 return vui_sar_idc;
411 case V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL:
412 return mpeg_mpeg4_level;
413 case V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE:
414 return mpeg4_profile;
0996517c
HV		 415 default:
416 return NULL;
417 }
418}
419EXPORT_SYMBOL(v4l2_ctrl_get_menu);
420
421/* Return the control name. */
422const char *v4l2_ctrl_get_name(u32 id)
423{
424 switch (id) {
425 /* USER controls */
6c8d6111 426 /* Keep the order of the 'case's the same as in videodev2.h! */
6dd5aff3
MCC		 427 case V4L2_CID_USER_CLASS: return "User Controls";
428 case V4L2_CID_BRIGHTNESS: return "Brightness";
429 case V4L2_CID_CONTRAST: return "Contrast";
430 case V4L2_CID_SATURATION: return "Saturation";
431 case V4L2_CID_HUE: return "Hue";
432 case V4L2_CID_AUDIO_VOLUME: return "Volume";
433 case V4L2_CID_AUDIO_BALANCE: return "Balance";
434 case V4L2_CID_AUDIO_BASS: return "Bass";
435 case V4L2_CID_AUDIO_TREBLE: return "Treble";
436 case V4L2_CID_AUDIO_MUTE: return "Mute";
437 case V4L2_CID_AUDIO_LOUDNESS: return "Loudness";
0996517c
HV		 438 case V4L2_CID_BLACK_LEVEL: return "Black Level";
439 case V4L2_CID_AUTO_WHITE_BALANCE: return "White Balance, Automatic";
440 case V4L2_CID_DO_WHITE_BALANCE: return "Do White Balance";
441 case V4L2_CID_RED_BALANCE: return "Red Balance";
442 case V4L2_CID_BLUE_BALANCE: return "Blue Balance";
443 case V4L2_CID_GAMMA: return "Gamma";
444 case V4L2_CID_EXPOSURE: return "Exposure";
445 case V4L2_CID_AUTOGAIN: return "Gain, Automatic";
446 case V4L2_CID_GAIN: return "Gain";
447 case V4L2_CID_HFLIP: return "Horizontal Flip";
448 case V4L2_CID_VFLIP: return "Vertical Flip";
449 case V4L2_CID_HCENTER: return "Horizontal Center";
450 case V4L2_CID_VCENTER: return "Vertical Center";
451 case V4L2_CID_POWER_LINE_FREQUENCY: return "Power Line Frequency";
452 case V4L2_CID_HUE_AUTO: return "Hue, Automatic";
453 case V4L2_CID_WHITE_BALANCE_TEMPERATURE: return "White Balance Temperature";
454 case V4L2_CID_SHARPNESS: return "Sharpness";
455 case V4L2_CID_BACKLIGHT_COMPENSATION: return "Backlight Compensation";
456 case V4L2_CID_CHROMA_AGC: return "Chroma AGC";
0996517c
HV		 457 case V4L2_CID_COLOR_KILLER: return "Color Killer";
458 case V4L2_CID_COLORFX: return "Color Effects";
459 case V4L2_CID_AUTOBRIGHTNESS: return "Brightness, Automatic";
460 case V4L2_CID_BAND_STOP_FILTER: return "Band-Stop Filter";
461 case V4L2_CID_ROTATE: return "Rotate";
462 case V4L2_CID_BG_COLOR: return "Background Color";
6c8d6111 463 case V4L2_CID_CHROMA_GAIN: return "Chroma Gain";
008d35f2
JFM		 464 case V4L2_CID_ILLUMINATORS_1: return "Illuminator 1";
465 case V4L2_CID_ILLUMINATORS_2: return "Illuminator 2";
064f5096
KD		 466 case V4L2_CID_MIN_BUFFERS_FOR_CAPTURE: return "Minimum Number of Capture Buffers";
467 case V4L2_CID_MIN_BUFFERS_FOR_OUTPUT: return "Minimum Number of Output Buffers";
0996517c
HV		 468
469 /* MPEG controls */
6c8d6111 470 /* Keep the order of the 'case's the same as in videodev2.h! */
6dd5aff3
MCC		 471 case V4L2_CID_MPEG_CLASS: return "MPEG Encoder Controls";
472 case V4L2_CID_MPEG_STREAM_TYPE: return "Stream Type";
473 case V4L2_CID_MPEG_STREAM_PID_PMT: return "Stream PMT Program ID";
474 case V4L2_CID_MPEG_STREAM_PID_AUDIO: return "Stream Audio Program ID";
475 case V4L2_CID_MPEG_STREAM_PID_VIDEO: return "Stream Video Program ID";
476 case V4L2_CID_MPEG_STREAM_PID_PCR: return "Stream PCR Program ID";
6c8d6111
HV		 477 case V4L2_CID_MPEG_STREAM_PES_ID_AUDIO: return "Stream PES Audio ID";
478 case V4L2_CID_MPEG_STREAM_PES_ID_VIDEO: return "Stream PES Video ID";
479 case V4L2_CID_MPEG_STREAM_VBI_FMT: return "Stream VBI Format";
0996517c 480 case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ: return "Audio Sampling Frequency";
6dd5aff3
MCC		 481 case V4L2_CID_MPEG_AUDIO_ENCODING: return "Audio Encoding";
482 case V4L2_CID_MPEG_AUDIO_L1_BITRATE: return "Audio Layer I Bitrate";
483 case V4L2_CID_MPEG_AUDIO_L2_BITRATE: return "Audio Layer II Bitrate";
484 case V4L2_CID_MPEG_AUDIO_L3_BITRATE: return "Audio Layer III Bitrate";
485 case V4L2_CID_MPEG_AUDIO_MODE: return "Audio Stereo Mode";
0996517c 486 case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION: return "Audio Stereo Mode Extension";
6dd5aff3
MCC		 487 case V4L2_CID_MPEG_AUDIO_EMPHASIS: return "Audio Emphasis";
488 case V4L2_CID_MPEG_AUDIO_CRC: return "Audio CRC";
489 case V4L2_CID_MPEG_AUDIO_MUTE: return "Audio Mute";
490 case V4L2_CID_MPEG_AUDIO_AAC_BITRATE: return "Audio AAC Bitrate";
491 case V4L2_CID_MPEG_AUDIO_AC3_BITRATE: return "Audio AC-3 Bitrate";
492 case V4L2_CID_MPEG_VIDEO_ENCODING: return "Video Encoding";
493 case V4L2_CID_MPEG_VIDEO_ASPECT: return "Video Aspect";
494 case V4L2_CID_MPEG_VIDEO_B_FRAMES: return "Video B Frames";
495 case V4L2_CID_MPEG_VIDEO_GOP_SIZE: return "Video GOP Size";
496 case V4L2_CID_MPEG_VIDEO_GOP_CLOSURE: return "Video GOP Closure";
497 case V4L2_CID_MPEG_VIDEO_PULLDOWN: return "Video Pulldown";
498 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE: return "Video Bitrate Mode";
499 case V4L2_CID_MPEG_VIDEO_BITRATE: return "Video Bitrate";
500 case V4L2_CID_MPEG_VIDEO_BITRATE_PEAK: return "Video Peak Bitrate";
0996517c 501 case V4L2_CID_MPEG_VIDEO_TEMPORAL_DECIMATION: return "Video Temporal Decimation";
6dd5aff3 502 case V4L2_CID_MPEG_VIDEO_MUTE: return "Video Mute";
0996517c 503 case V4L2_CID_MPEG_VIDEO_MUTE_YUV: return "Video Mute YUV";
064f5096
KD		 504 case V4L2_CID_MPEG_VIDEO_DECODER_SLICE_INTERFACE: return "Decoder Slice Interface";
505 case V4L2_CID_MPEG_VIDEO_DECODER_MPEG4_DEBLOCK_FILTER: return "MPEG4 Loop Filter Enable";
506 case V4L2_CID_MPEG_VIDEO_CYCLIC_INTRA_REFRESH_MB: return "The Number of Intra Refresh MBs";
507 case V4L2_CID_MPEG_VIDEO_FRAME_RC_ENABLE: return "Frame Level Rate Control Enable";
508 case V4L2_CID_MPEG_VIDEO_MB_RC_ENABLE: return "H264 MB Level Rate Control";
509 case V4L2_CID_MPEG_VIDEO_HEADER_MODE: return "Sequence Header Mode";
510 case V4L2_CID_MPEG_VIDEO_MAX_REF_PIC: return "The Max Number of Reference Picture";
511 case V4L2_CID_MPEG_VIDEO_H263_I_FRAME_QP: return "H263 I-Frame QP Value";
512 case V4L2_CID_MPEG_VIDEO_H263_P_FRAME_QP: return "H263 P frame QP Value";
513 case V4L2_CID_MPEG_VIDEO_H263_B_FRAME_QP: return "H263 B frame QP Value";
514 case V4L2_CID_MPEG_VIDEO_H263_MIN_QP: return "H263 Minimum QP Value";
515 case V4L2_CID_MPEG_VIDEO_H263_MAX_QP: return "H263 Maximum QP Value";
516 case V4L2_CID_MPEG_VIDEO_H264_I_FRAME_QP: return "H264 I-Frame QP Value";
517 case V4L2_CID_MPEG_VIDEO_H264_P_FRAME_QP: return "H264 P frame QP Value";
518 case V4L2_CID_MPEG_VIDEO_H264_B_FRAME_QP: return "H264 B frame QP Value";
519 case V4L2_CID_MPEG_VIDEO_H264_MAX_QP: return "H264 Maximum QP Value";
520 case V4L2_CID_MPEG_VIDEO_H264_MIN_QP: return "H264 Minimum QP Value";
521 case V4L2_CID_MPEG_VIDEO_H264_8X8_TRANSFORM: return "H264 8x8 Transform Enable";
522 case V4L2_CID_MPEG_VIDEO_H264_CPB_SIZE: return "H264 CPB Buffer Size";
523 case V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE: return "H264 Entorpy Mode";
524 case V4L2_CID_MPEG_VIDEO_H264_I_PERIOD: return "H264 I Period";
525 case V4L2_CID_MPEG_VIDEO_H264_LEVEL: return "H264 Level";
526 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_ALPHA: return "H264 Loop Filter Alpha Offset";
527 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_BETA: return "H264 Loop Filter Beta Offset";
528 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE: return "H264 Loop Filter Mode";
529 case V4L2_CID_MPEG_VIDEO_H264_PROFILE: return "H264 Profile";
530 case V4L2_CID_MPEG_VIDEO_H264_VUI_EXT_SAR_HEIGHT: return "Vertical Size of SAR";
531 case V4L2_CID_MPEG_VIDEO_H264_VUI_EXT_SAR_WIDTH: return "Horizontal Size of SAR";
532 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_ENABLE: return "Aspect Ratio VUI Enable";
533 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC: return "VUI Aspect Ratio IDC";
534 case V4L2_CID_MPEG_VIDEO_MPEG4_I_FRAME_QP: return "MPEG4 I-Frame QP Value";
535 case V4L2_CID_MPEG_VIDEO_MPEG4_P_FRAME_QP: return "MPEG4 P frame QP Value";
536 case V4L2_CID_MPEG_VIDEO_MPEG4_B_FRAME_QP: return "MPEG4 B frame QP Value";
537 case V4L2_CID_MPEG_VIDEO_MPEG4_MIN_QP: return "MPEG4 Minimum QP Value";
538 case V4L2_CID_MPEG_VIDEO_MPEG4_MAX_QP: return "MPEG4 Maximum QP Value";
539 case V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL: return "MPEG4 Level";
540 case V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE: return "MPEG4 Profile";
541 case V4L2_CID_MPEG_VIDEO_MPEG4_QPEL: return "Quarter Pixel Search Enable";
542 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MAX_BYTES: return "The Maximum Bytes Per Slice";
543 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MAX_MB: return "The Number of MB in a Slice";
544 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE: return "The Slice Partitioning Method";
545 case V4L2_CID_MPEG_VIDEO_VBV_SIZE: return "VBV Buffer Size";
0996517c
HV		 546
547 /* CAMERA controls */
6c8d6111 548 /* Keep the order of the 'case's the same as in videodev2.h! */
0996517c
HV		 549 case V4L2_CID_CAMERA_CLASS: return "Camera Controls";
550 case V4L2_CID_EXPOSURE_AUTO: return "Auto Exposure";
551 case V4L2_CID_EXPOSURE_ABSOLUTE: return "Exposure Time, Absolute";
552 case V4L2_CID_EXPOSURE_AUTO_PRIORITY: return "Exposure, Dynamic Framerate";
553 case V4L2_CID_PAN_RELATIVE: return "Pan, Relative";
554 case V4L2_CID_TILT_RELATIVE: return "Tilt, Relative";
555 case V4L2_CID_PAN_RESET: return "Pan, Reset";
556 case V4L2_CID_TILT_RESET: return "Tilt, Reset";
557 case V4L2_CID_PAN_ABSOLUTE: return "Pan, Absolute";
558 case V4L2_CID_TILT_ABSOLUTE: return "Tilt, Absolute";
559 case V4L2_CID_FOCUS_ABSOLUTE: return "Focus, Absolute";
560 case V4L2_CID_FOCUS_RELATIVE: return "Focus, Relative";
561 case V4L2_CID_FOCUS_AUTO: return "Focus, Automatic";
0996517c
HV		 562 case V4L2_CID_ZOOM_ABSOLUTE: return "Zoom, Absolute";
563 case V4L2_CID_ZOOM_RELATIVE: return "Zoom, Relative";
564 case V4L2_CID_ZOOM_CONTINUOUS: return "Zoom, Continuous";
565 case V4L2_CID_PRIVACY: return "Privacy";
6c8d6111
HV		 566 case V4L2_CID_IRIS_ABSOLUTE: return "Iris, Absolute";
567 case V4L2_CID_IRIS_RELATIVE: return "Iris, Relative";
0996517c
HV		 568
569 /* FM Radio Modulator control */
6c8d6111 570 /* Keep the order of the 'case's the same as in videodev2.h! */
0996517c
HV		 571 case V4L2_CID_FM_TX_CLASS: return "FM Radio Modulator Controls";
572 case V4L2_CID_RDS_TX_DEVIATION: return "RDS Signal Deviation";
573 case V4L2_CID_RDS_TX_PI: return "RDS Program ID";
574 case V4L2_CID_RDS_TX_PTY: return "RDS Program Type";
575 case V4L2_CID_RDS_TX_PS_NAME: return "RDS PS Name";
576 case V4L2_CID_RDS_TX_RADIO_TEXT: return "RDS Radio Text";
577 case V4L2_CID_AUDIO_LIMITER_ENABLED: return "Audio Limiter Feature Enabled";
578 case V4L2_CID_AUDIO_LIMITER_RELEASE_TIME: return "Audio Limiter Release Time";
579 case V4L2_CID_AUDIO_LIMITER_DEVIATION: return "Audio Limiter Deviation";
580 case V4L2_CID_AUDIO_COMPRESSION_ENABLED: return "Audio Compression Feature Enabled";
581 case V4L2_CID_AUDIO_COMPRESSION_GAIN: return "Audio Compression Gain";
582 case V4L2_CID_AUDIO_COMPRESSION_THRESHOLD: return "Audio Compression Threshold";
583 case V4L2_CID_AUDIO_COMPRESSION_ATTACK_TIME: return "Audio Compression Attack Time";
584 case V4L2_CID_AUDIO_COMPRESSION_RELEASE_TIME: return "Audio Compression Release Time";
585 case V4L2_CID_PILOT_TONE_ENABLED: return "Pilot Tone Feature Enabled";
586 case V4L2_CID_PILOT_TONE_DEVIATION: return "Pilot Tone Deviation";
587 case V4L2_CID_PILOT_TONE_FREQUENCY: return "Pilot Tone Frequency";
588 case V4L2_CID_TUNE_PREEMPHASIS: return "Pre-emphasis settings";
589 case V4L2_CID_TUNE_POWER_LEVEL: return "Tune Power Level";
590 case V4L2_CID_TUNE_ANTENNA_CAPACITOR: return "Tune Antenna Capacitor";
591
0b159acd
SA		 592 /* Flash controls */
593 case V4L2_CID_FLASH_CLASS: return "Flash controls";
594 case V4L2_CID_FLASH_LED_MODE: return "LED mode";
595 case V4L2_CID_FLASH_STROBE_SOURCE: return "Strobe source";
596 case V4L2_CID_FLASH_STROBE: return "Strobe";
597 case V4L2_CID_FLASH_STROBE_STOP: return "Stop strobe";
598 case V4L2_CID_FLASH_STROBE_STATUS: return "Strobe status";
599 case V4L2_CID_FLASH_TIMEOUT: return "Strobe timeout";
600 case V4L2_CID_FLASH_INTENSITY: return "Intensity, flash mode";
601 case V4L2_CID_FLASH_TORCH_INTENSITY: return "Intensity, torch mode";
602 case V4L2_CID_FLASH_INDICATOR_INTENSITY: return "Intensity, indicator";
603 case V4L2_CID_FLASH_FAULT: return "Faults";
604 case V4L2_CID_FLASH_CHARGE: return "Charge";
605 case V4L2_CID_FLASH_READY: return "Ready to strobe";
606
0996517c
HV		 607 default:
608 return NULL;
609 }
610}
611EXPORT_SYMBOL(v4l2_ctrl_get_name);
612
613void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type,
614 s32 *min, s32 *max, s32 *step, s32 *def, u32 *flags)
615{
616 *name = v4l2_ctrl_get_name(id);
617 *flags = 0;
618
619 switch (id) {
620 case V4L2_CID_AUDIO_MUTE:
621 case V4L2_CID_AUDIO_LOUDNESS:
622 case V4L2_CID_AUTO_WHITE_BALANCE:
623 case V4L2_CID_AUTOGAIN:
624 case V4L2_CID_HFLIP:
625 case V4L2_CID_VFLIP:
626 case V4L2_CID_HUE_AUTO:
627 case V4L2_CID_CHROMA_AGC:
628 case V4L2_CID_COLOR_KILLER:
629 case V4L2_CID_MPEG_AUDIO_MUTE:
630 case V4L2_CID_MPEG_VIDEO_MUTE:
631 case V4L2_CID_MPEG_VIDEO_GOP_CLOSURE:
632 case V4L2_CID_MPEG_VIDEO_PULLDOWN:
633 case V4L2_CID_EXPOSURE_AUTO_PRIORITY:
634 case V4L2_CID_FOCUS_AUTO:
635 case V4L2_CID_PRIVACY:
636 case V4L2_CID_AUDIO_LIMITER_ENABLED:
637 case V4L2_CID_AUDIO_COMPRESSION_ENABLED:
638 case V4L2_CID_PILOT_TONE_ENABLED:
008d35f2
JFM		 639 case V4L2_CID_ILLUMINATORS_1:
640 case V4L2_CID_ILLUMINATORS_2:
0b159acd
SA		 641 case V4L2_CID_FLASH_STROBE_STATUS:
642 case V4L2_CID_FLASH_CHARGE:
643 case V4L2_CID_FLASH_READY:
064f5096
KD		 644 case V4L2_CID_MPEG_VIDEO_DECODER_MPEG4_DEBLOCK_FILTER:
645 case V4L2_CID_MPEG_VIDEO_DECODER_SLICE_INTERFACE:
646 case V4L2_CID_MPEG_VIDEO_FRAME_RC_ENABLE:
647 case V4L2_CID_MPEG_VIDEO_MB_RC_ENABLE:
648 case V4L2_CID_MPEG_VIDEO_H264_8X8_TRANSFORM:
649 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_ENABLE:
650 case V4L2_CID_MPEG_VIDEO_MPEG4_QPEL:
0996517c
HV		 651 *type = V4L2_CTRL_TYPE_BOOLEAN;
652 *min = 0;
653 *max = *step = 1;
654 break;
655 case V4L2_CID_PAN_RESET:
656 case V4L2_CID_TILT_RESET:
0b159acd
SA		 657 case V4L2_CID_FLASH_STROBE:
658 case V4L2_CID_FLASH_STROBE_STOP:
0996517c
HV		 659 *type = V4L2_CTRL_TYPE_BUTTON;
660 *flags |= V4L2_CTRL_FLAG_WRITE_ONLY;
661 *min = *max = *step = *def = 0;
662 break;
663 case V4L2_CID_POWER_LINE_FREQUENCY:
664 case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ:
665 case V4L2_CID_MPEG_AUDIO_ENCODING:
666 case V4L2_CID_MPEG_AUDIO_L1_BITRATE:
667 case V4L2_CID_MPEG_AUDIO_L2_BITRATE:
668 case V4L2_CID_MPEG_AUDIO_L3_BITRATE:
669 case V4L2_CID_MPEG_AUDIO_AC3_BITRATE:
670 case V4L2_CID_MPEG_AUDIO_MODE:
671 case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION:
672 case V4L2_CID_MPEG_AUDIO_EMPHASIS:
673 case V4L2_CID_MPEG_AUDIO_CRC:
674 case V4L2_CID_MPEG_VIDEO_ENCODING:
675 case V4L2_CID_MPEG_VIDEO_ASPECT:
676 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
677 case V4L2_CID_MPEG_STREAM_TYPE:
678 case V4L2_CID_MPEG_STREAM_VBI_FMT:
679 case V4L2_CID_EXPOSURE_AUTO:
680 case V4L2_CID_COLORFX:
681 case V4L2_CID_TUNE_PREEMPHASIS:
0b159acd
SA		 682 case V4L2_CID_FLASH_LED_MODE:
683 case V4L2_CID_FLASH_STROBE_SOURCE:
064f5096
KD		 684 case V4L2_CID_MPEG_VIDEO_HEADER_MODE:
685 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE:
686 case V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE:
687 case V4L2_CID_MPEG_VIDEO_H264_LEVEL:
688 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE:
689 case V4L2_CID_MPEG_VIDEO_H264_PROFILE:
690 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC:
691 case V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL:
692 case V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE:
0996517c
HV		 693 *type = V4L2_CTRL_TYPE_MENU;
694 break;
695 case V4L2_CID_RDS_TX_PS_NAME:
696 case V4L2_CID_RDS_TX_RADIO_TEXT:
697 *type = V4L2_CTRL_TYPE_STRING;
698 break;
699 case V4L2_CID_USER_CLASS:
700 case V4L2_CID_CAMERA_CLASS:
701 case V4L2_CID_MPEG_CLASS:
702 case V4L2_CID_FM_TX_CLASS:
0b159acd 703 case V4L2_CID_FLASH_CLASS:
0996517c
HV		 704 *type = V4L2_CTRL_TYPE_CTRL_CLASS;
705 /* You can neither read not write these */
706 *flags |= V4L2_CTRL_FLAG_READ_ONLY | V4L2_CTRL_FLAG_WRITE_ONLY;
707 *min = *max = *step = *def = 0;
708 break;
709 case V4L2_CID_BG_COLOR:
710 *type = V4L2_CTRL_TYPE_INTEGER;
711 *step = 1;
712 *min = 0;
713 /* Max is calculated as RGB888 that is 2^24 */
714 *max = 0xFFFFFF;
715 break;
0b159acd
SA		 716 case V4L2_CID_FLASH_FAULT:
717 *type = V4L2_CTRL_TYPE_BITMASK;
718 break;
064f5096
KD		 719 case V4L2_CID_MIN_BUFFERS_FOR_CAPTURE:
720 case V4L2_CID_MIN_BUFFERS_FOR_OUTPUT:
721 *type = V4L2_CTRL_TYPE_INTEGER;
722 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
723 break;
0996517c
HV		 724 default:
725 *type = V4L2_CTRL_TYPE_INTEGER;
726 break;
727 }
728 switch (id) {
729 case V4L2_CID_MPEG_AUDIO_ENCODING:
730 case V4L2_CID_MPEG_AUDIO_MODE:
731 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
732 case V4L2_CID_MPEG_VIDEO_B_FRAMES:
733 case V4L2_CID_MPEG_STREAM_TYPE:
734 *flags |= V4L2_CTRL_FLAG_UPDATE;
735 break;
736 case V4L2_CID_AUDIO_VOLUME:
737 case V4L2_CID_AUDIO_BALANCE:
738 case V4L2_CID_AUDIO_BASS:
739 case V4L2_CID_AUDIO_TREBLE:
740 case V4L2_CID_BRIGHTNESS:
741 case V4L2_CID_CONTRAST:
742 case V4L2_CID_SATURATION:
743 case V4L2_CID_HUE:
744 case V4L2_CID_RED_BALANCE:
745 case V4L2_CID_BLUE_BALANCE:
746 case V4L2_CID_GAMMA:
747 case V4L2_CID_SHARPNESS:
748 case V4L2_CID_CHROMA_GAIN:
749 case V4L2_CID_RDS_TX_DEVIATION:
750 case V4L2_CID_AUDIO_LIMITER_RELEASE_TIME:
751 case V4L2_CID_AUDIO_LIMITER_DEVIATION:
752 case V4L2_CID_AUDIO_COMPRESSION_GAIN:
753 case V4L2_CID_AUDIO_COMPRESSION_THRESHOLD:
754 case V4L2_CID_AUDIO_COMPRESSION_ATTACK_TIME:
755 case V4L2_CID_AUDIO_COMPRESSION_RELEASE_TIME:
756 case V4L2_CID_PILOT_TONE_DEVIATION:
757 case V4L2_CID_PILOT_TONE_FREQUENCY:
758 case V4L2_CID_TUNE_POWER_LEVEL:
759 case V4L2_CID_TUNE_ANTENNA_CAPACITOR:
760 *flags |= V4L2_CTRL_FLAG_SLIDER;
761 break;
762 case V4L2_CID_PAN_RELATIVE:
763 case V4L2_CID_TILT_RELATIVE:
764 case V4L2_CID_FOCUS_RELATIVE:
765 case V4L2_CID_IRIS_RELATIVE:
766 case V4L2_CID_ZOOM_RELATIVE:
767 *flags |= V4L2_CTRL_FLAG_WRITE_ONLY;
768 break;
0b159acd
SA		 769 case V4L2_CID_FLASH_STROBE_STATUS:
770 case V4L2_CID_FLASH_READY:
771 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
772 break;
0996517c
HV		 773 }
774}
775EXPORT_SYMBOL(v4l2_ctrl_fill);
776
777/* Helper function to determine whether the control type is compatible with
778 VIDIOC_G/S_CTRL. */
779static bool type_is_int(const struct v4l2_ctrl *ctrl)
780{
781 switch (ctrl->type) {
782 case V4L2_CTRL_TYPE_INTEGER64:
783 case V4L2_CTRL_TYPE_STRING:
784 /* Nope, these need v4l2_ext_control */
785 return false;
786 default:
787 return true;
788 }
789}
790
6e239399
HV		 791static void fill_event(struct v4l2_event *ev, struct v4l2_ctrl *ctrl, u32 changes)
792{
793 memset(ev->reserved, 0, sizeof(ev->reserved));
794 ev->type = V4L2_EVENT_CTRL;
795 ev->id = ctrl->id;
796 ev->u.ctrl.changes = changes;
797 ev->u.ctrl.type = ctrl->type;
798 ev->u.ctrl.flags = ctrl->flags;
799 if (ctrl->type == V4L2_CTRL_TYPE_STRING)
800 ev->u.ctrl.value64 = 0;
801 else
802 ev->u.ctrl.value64 = ctrl->cur.val64;
803 ev->u.ctrl.minimum = ctrl->minimum;
804 ev->u.ctrl.maximum = ctrl->maximum;
805 if (ctrl->type == V4L2_CTRL_TYPE_MENU)
806 ev->u.ctrl.step = 1;
807 else
808 ev->u.ctrl.step = ctrl->step;
809 ev->u.ctrl.default_value = ctrl->default_value;
810}
811
812static void send_event(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, u32 changes)
813{
814 struct v4l2_event ev;
77068d36 815 struct v4l2_subscribed_event *sev;
6e239399 816
77068d36 817 if (list_empty(&ctrl->ev_subs))
3f66f0ed 818 return;
6e239399
HV		 819 fill_event(&ev, ctrl, changes);
820
77068d36 821 list_for_each_entry(sev, &ctrl->ev_subs, node)
60c07322
HV		 822 if (sev->fh && (sev->fh != fh ||
823 (sev->flags & V4L2_EVENT_SUB_FL_ALLOW_FEEDBACK)))
77068d36 824 v4l2_event_queue_fh(sev->fh, &ev);
6e239399
HV		 825}
826
0996517c
HV		 827/* Helper function: copy the current control value back to the caller */
828static int cur_to_user(struct v4l2_ext_control *c,
829 struct v4l2_ctrl *ctrl)
830{
831 u32 len;
832
833 switch (ctrl->type) {
834 case V4L2_CTRL_TYPE_STRING:
835 len = strlen(ctrl->cur.string);
836 if (c->size < len + 1) {
837 c->size = len + 1;
838 return -ENOSPC;
839 }
840 return copy_to_user(c->string, ctrl->cur.string,
841 len + 1) ? -EFAULT : 0;
842 case V4L2_CTRL_TYPE_INTEGER64:
843 c->value64 = ctrl->cur.val64;
844 break;
845 default:
846 c->value = ctrl->cur.val;
847 break;
848 }
849 return 0;
850}
851
852/* Helper function: copy the caller-provider value as the new control value */
853static int user_to_new(struct v4l2_ext_control *c,
854 struct v4l2_ctrl *ctrl)
855{
856 int ret;
857 u32 size;
858
2a863793 859 ctrl->is_new = 1;
0996517c
HV		 860 switch (ctrl->type) {
861 case V4L2_CTRL_TYPE_INTEGER64:
862 ctrl->val64 = c->value64;
863 break;
864 case V4L2_CTRL_TYPE_STRING:
865 size = c->size;
866 if (size == 0)
867 return -ERANGE;
868 if (size > ctrl->maximum + 1)
869 size = ctrl->maximum + 1;
870 ret = copy_from_user(ctrl->string, c->string, size);
871 if (!ret) {
872 char last = ctrl->string[size - 1];
873
874 ctrl->string[size - 1] = 0;
875 /* If the string was longer than ctrl->maximum,
876 then return an error. */
877 if (strlen(ctrl->string) == ctrl->maximum && last)
878 return -ERANGE;
879 }
880 return ret ? -EFAULT : 0;
881 default:
882 ctrl->val = c->value;
883 break;
884 }
885 return 0;
886}
887
888/* Helper function: copy the new control value back to the caller */
889static int new_to_user(struct v4l2_ext_control *c,
890 struct v4l2_ctrl *ctrl)
891{
892 u32 len;
893
894 switch (ctrl->type) {
895 case V4L2_CTRL_TYPE_STRING:
896 len = strlen(ctrl->string);
897 if (c->size < len + 1) {
898 c->size = ctrl->maximum + 1;
899 return -ENOSPC;
900 }
901 return copy_to_user(c->string, ctrl->string,
902 len + 1) ? -EFAULT : 0;
903 case V4L2_CTRL_TYPE_INTEGER64:
904 c->value64 = ctrl->val64;
905 break;
906 default:
907 c->value = ctrl->val;
908 break;
909 }
910 return 0;
911}
912
913/* Copy the new value to the current value. */
ab892bac
HV		 914static void new_to_cur(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl,
915 bool update_inactive)
0996517c 916{
6e239399
HV		 917 bool changed = false;
918
0996517c
HV		 919 if (ctrl == NULL)
920 return;
921 switch (ctrl->type) {
6e239399
HV		 922 case V4L2_CTRL_TYPE_BUTTON:
923 changed = true;
924 break;
0996517c
HV		 925 case V4L2_CTRL_TYPE_STRING:
926 /* strings are always 0-terminated */
6e239399 927 changed = strcmp(ctrl->string, ctrl->cur.string);
0996517c
HV		 928 strcpy(ctrl->cur.string, ctrl->string);
929 break;
930 case V4L2_CTRL_TYPE_INTEGER64:
6e239399 931 changed = ctrl->val64 != ctrl->cur.val64;
0996517c
HV		 932 ctrl->cur.val64 = ctrl->val64;
933 break;
934 default:
6e239399 935 changed = ctrl->val != ctrl->cur.val;
0996517c
HV		 936 ctrl->cur.val = ctrl->val;
937 break;
938 }
72d877ca
HV		 939 if (update_inactive) {
940 ctrl->flags &= ~V4L2_CTRL_FLAG_INACTIVE;
941 if (!is_cur_manual(ctrl->cluster[0]))
942 ctrl->flags |= V4L2_CTRL_FLAG_INACTIVE;
943 }
639884a6
HV		 944 if (changed || update_inactive) {
945 /* If a control was changed that was not one of the controls
946 modified by the application, then send the event to all. */
947 if (!ctrl->is_new)
948 fh = NULL;
6e239399
HV		 949 send_event(fh, ctrl,
950 (changed ? V4L2_EVENT_CTRL_CH_VALUE : 0) |
951 (update_inactive ? V4L2_EVENT_CTRL_CH_FLAGS : 0));
639884a6 952 }
0996517c
HV		 953}
954
955/* Copy the current value to the new value */
956static void cur_to_new(struct v4l2_ctrl *ctrl)
957{
958 if (ctrl == NULL)
959 return;
960 switch (ctrl->type) {
961 case V4L2_CTRL_TYPE_STRING:
962 /* strings are always 0-terminated */
963 strcpy(ctrl->string, ctrl->cur.string);
964 break;
965 case V4L2_CTRL_TYPE_INTEGER64:
966 ctrl->val64 = ctrl->cur.val64;
967 break;
968 default:
969 ctrl->val = ctrl->cur.val;
970 break;
971 }
972}
973
974/* Return non-zero if one or more of the controls in the cluster has a new
975 value that differs from the current value. */
976static int cluster_changed(struct v4l2_ctrl *master)
977{
978 int diff = 0;
979 int i;
980
981 for (i = 0; !diff && i < master->ncontrols; i++) {
982 struct v4l2_ctrl *ctrl = master->cluster[i];
983
984 if (ctrl == NULL)
985 continue;
986 switch (ctrl->type) {
987 case V4L2_CTRL_TYPE_BUTTON:
988 /* Button controls are always 'different' */
989 return 1;
990 case V4L2_CTRL_TYPE_STRING:
991 /* strings are always 0-terminated */
992 diff = strcmp(ctrl->string, ctrl->cur.string);
993 break;
994 case V4L2_CTRL_TYPE_INTEGER64:
995 diff = ctrl->val64 != ctrl->cur.val64;
996 break;
997 default:
998 diff = ctrl->val != ctrl->cur.val;
999 break;
1000 }
1001 }
1002 return diff;
1003}
1004
eb5b16ef
HV		 1005/* Validate integer-type control */
1006static int validate_new_int(const struct v4l2_ctrl *ctrl, s32 *pval)
0996517c 1007{
eb5b16ef 1008 s32 val = *pval;
0996517c 1009 u32 offset;
0996517c
HV		 1010
1011 switch (ctrl->type) {
1012 case V4L2_CTRL_TYPE_INTEGER:
1013 /* Round towards the closest legal value */
1014 val += ctrl->step / 2;
1015 if (val < ctrl->minimum)
1016 val = ctrl->minimum;
1017 if (val > ctrl->maximum)
1018 val = ctrl->maximum;
1019 offset = val - ctrl->minimum;
1020 offset = ctrl->step * (offset / ctrl->step);
1021 val = ctrl->minimum + offset;
eb5b16ef 1022 *pval = val;
0996517c
HV		 1023 return 0;
1024
1025 case V4L2_CTRL_TYPE_BOOLEAN:
eb5b16ef 1026 *pval = !!val;
0996517c
HV		 1027 return 0;
1028
1029 case V4L2_CTRL_TYPE_MENU:
1030 if (val < ctrl->minimum || val > ctrl->maximum)
1031 return -ERANGE;
1032 if (ctrl->qmenu[val][0] == '\0' ||
1033 (ctrl->menu_skip_mask & (1 << val)))
1034 return -EINVAL;
1035 return 0;
1036
fa4d7096
HV		 1037 case V4L2_CTRL_TYPE_BITMASK:
1038 *pval &= ctrl->maximum;
1039 return 0;
1040
0996517c
HV		 1041 case V4L2_CTRL_TYPE_BUTTON:
1042 case V4L2_CTRL_TYPE_CTRL_CLASS:
eb5b16ef 1043 *pval = 0;
0996517c
HV		 1044 return 0;
1045
eb5b16ef
HV		 1046 default:
1047 return -EINVAL;
1048 }
1049}
1050
1051/* Validate a new control */
1052static int validate_new(const struct v4l2_ctrl *ctrl, struct v4l2_ext_control *c)
1053{
1054 char *s = c->string;
1055 size_t len;
1056
1057 switch (ctrl->type) {
1058 case V4L2_CTRL_TYPE_INTEGER:
1059 case V4L2_CTRL_TYPE_BOOLEAN:
1060 case V4L2_CTRL_TYPE_MENU:
fa4d7096 1061 case V4L2_CTRL_TYPE_BITMASK:
eb5b16ef
HV		 1062 case V4L2_CTRL_TYPE_BUTTON:
1063 case V4L2_CTRL_TYPE_CTRL_CLASS:
1064 return validate_new_int(ctrl, &c->value);
1065
0996517c
HV		 1066 case V4L2_CTRL_TYPE_INTEGER64:
1067 return 0;
1068
1069 case V4L2_CTRL_TYPE_STRING:
1070 len = strlen(s);
1071 if (len < ctrl->minimum)
1072 return -ERANGE;
1073 if ((len - ctrl->minimum) % ctrl->step)
1074 return -ERANGE;
1075 return 0;
1076
1077 default:
1078 return -EINVAL;
1079 }
1080}
1081
1082static inline u32 node2id(struct list_head *node)
1083{
1084 return list_entry(node, struct v4l2_ctrl_ref, node)->ctrl->id;
1085}
1086
1087/* Set the handler's error code if it wasn't set earlier already */
1088static inline int handler_set_err(struct v4l2_ctrl_handler *hdl, int err)
1089{
1090 if (hdl->error == 0)
1091 hdl->error = err;
1092 return err;
1093}
1094
1095/* Initialize the handler */
1096int v4l2_ctrl_handler_init(struct v4l2_ctrl_handler *hdl,
1097 unsigned nr_of_controls_hint)
1098{
1099 mutex_init(&hdl->lock);
1100 INIT_LIST_HEAD(&hdl->ctrls);
1101 INIT_LIST_HEAD(&hdl->ctrl_refs);
1102 hdl->nr_of_buckets = 1 + nr_of_controls_hint / 8;
1103 hdl->buckets = kzalloc(sizeof(hdl->buckets[0]) * hdl->nr_of_buckets,
1104 GFP_KERNEL);
1105 hdl->error = hdl->buckets ? 0 : -ENOMEM;
1106 return hdl->error;
1107}
1108EXPORT_SYMBOL(v4l2_ctrl_handler_init);
1109
1110/* Free all controls and control refs */
1111void v4l2_ctrl_handler_free(struct v4l2_ctrl_handler *hdl)
1112{
1113 struct v4l2_ctrl_ref *ref, *next_ref;
1114 struct v4l2_ctrl *ctrl, *next_ctrl;
77068d36 1115 struct v4l2_subscribed_event *sev, *next_sev;
0996517c
HV		 1116
1117 if (hdl == NULL || hdl->buckets == NULL)
1118 return;
1119
1120 mutex_lock(&hdl->lock);
1121 /* Free all nodes */
1122 list_for_each_entry_safe(ref, next_ref, &hdl->ctrl_refs, node) {
1123 list_del(&ref->node);
1124 kfree(ref);
1125 }
1126 /* Free all controls owned by the handler */
1127 list_for_each_entry_safe(ctrl, next_ctrl, &hdl->ctrls, node) {
1128 list_del(&ctrl->node);
77068d36
HV		 1129 list_for_each_entry_safe(sev, next_sev, &ctrl->ev_subs, node)
1130 list_del(&sev->node);
0996517c
HV		 1131 kfree(ctrl);
1132 }
1133 kfree(hdl->buckets);
1134 hdl->buckets = NULL;
1135 hdl->cached = NULL;
1136 hdl->error = 0;
1137 mutex_unlock(&hdl->lock);
1138}
1139EXPORT_SYMBOL(v4l2_ctrl_handler_free);
1140
1141/* For backwards compatibility: V4L2_CID_PRIVATE_BASE should no longer
1142 be used except in G_CTRL, S_CTRL, QUERYCTRL and QUERYMENU when dealing
1143 with applications that do not use the NEXT_CTRL flag.
1144
1145 We just find the n-th private user control. It's O(N), but that should not
1146 be an issue in this particular case. */
1147static struct v4l2_ctrl_ref *find_private_ref(
1148 struct v4l2_ctrl_handler *hdl, u32 id)
1149{
1150 struct v4l2_ctrl_ref *ref;
1151
1152 id -= V4L2_CID_PRIVATE_BASE;
1153 list_for_each_entry(ref, &hdl->ctrl_refs, node) {
1154 /* Search for private user controls that are compatible with
1155 VIDIOC_G/S_CTRL. */
1156 if (V4L2_CTRL_ID2CLASS(ref->ctrl->id) == V4L2_CTRL_CLASS_USER &&
1157 V4L2_CTRL_DRIVER_PRIV(ref->ctrl->id)) {
1158 if (!type_is_int(ref->ctrl))
1159 continue;
1160 if (id == 0)
1161 return ref;
1162 id--;
1163 }
1164 }
1165 return NULL;
1166}
1167
1168/* Find a control with the given ID. */
1169static struct v4l2_ctrl_ref *find_ref(struct v4l2_ctrl_handler *hdl, u32 id)
1170{
1171 struct v4l2_ctrl_ref *ref;
1172 int bucket;
1173
1174 id &= V4L2_CTRL_ID_MASK;
1175
1176 /* Old-style private controls need special handling */
1177 if (id >= V4L2_CID_PRIVATE_BASE)
1178 return find_private_ref(hdl, id);
1179 bucket = id % hdl->nr_of_buckets;
1180
1181 /* Simple optimization: cache the last control found */
1182 if (hdl->cached && hdl->cached->ctrl->id == id)
1183 return hdl->cached;
1184
1185 /* Not in cache, search the hash */
1186 ref = hdl->buckets ? hdl->buckets[bucket] : NULL;
1187 while (ref && ref->ctrl->id != id)
1188 ref = ref->next;
1189
1190 if (ref)
1191 hdl->cached = ref; /* cache it! */
1192 return ref;
1193}
1194
1195/* Find a control with the given ID. Take the handler's lock first. */
1196static struct v4l2_ctrl_ref *find_ref_lock(
1197 struct v4l2_ctrl_handler *hdl, u32 id)
1198{
1199 struct v4l2_ctrl_ref *ref = NULL;
1200
1201 if (hdl) {
1202 mutex_lock(&hdl->lock);
1203 ref = find_ref(hdl, id);
1204 mutex_unlock(&hdl->lock);
1205 }
1206 return ref;
1207}
1208
1209/* Find a control with the given ID. */
1210struct v4l2_ctrl *v4l2_ctrl_find(struct v4l2_ctrl_handler *hdl, u32 id)
1211{
1212 struct v4l2_ctrl_ref *ref = find_ref_lock(hdl, id);
1213
1214 return ref ? ref->ctrl : NULL;
1215}
1216EXPORT_SYMBOL(v4l2_ctrl_find);
1217
1218/* Allocate a new v4l2_ctrl_ref and hook it into the handler. */
1219static int handler_new_ref(struct v4l2_ctrl_handler *hdl,
1220 struct v4l2_ctrl *ctrl)
1221{
1222 struct v4l2_ctrl_ref *ref;
1223 struct v4l2_ctrl_ref *new_ref;
1224 u32 id = ctrl->id;
1225 u32 class_ctrl = V4L2_CTRL_ID2CLASS(id) | 1;
1226 int bucket = id % hdl->nr_of_buckets; /* which bucket to use */
1227
1228 /* Automatically add the control class if it is not yet present. */
1229 if (id != class_ctrl && find_ref_lock(hdl, class_ctrl) == NULL)
1230 if (!v4l2_ctrl_new_std(hdl, NULL, class_ctrl, 0, 0, 0, 0))
1231 return hdl->error;
1232
1233 if (hdl->error)
1234 return hdl->error;
1235
1236 new_ref = kzalloc(sizeof(*new_ref), GFP_KERNEL);
1237 if (!new_ref)
1238 return handler_set_err(hdl, -ENOMEM);
1239 new_ref->ctrl = ctrl;
1240 if (ctrl->handler == hdl) {
1241 /* By default each control starts in a cluster of its own.
1242 new_ref->ctrl is basically a cluster array with one
1243 element, so that's perfect to use as the cluster pointer.
1244 But only do this for the handler that owns the control. */
1245 ctrl->cluster = &new_ref->ctrl;
1246 ctrl->ncontrols = 1;
1247 }
1248
1249 INIT_LIST_HEAD(&new_ref->node);
1250
1251 mutex_lock(&hdl->lock);
1252
1253 /* Add immediately at the end of the list if the list is empty, or if
1254 the last element in the list has a lower ID.
1255 This ensures that when elements are added in ascending order the
1256 insertion is an O(1) operation. */
1257 if (list_empty(&hdl->ctrl_refs) || id > node2id(hdl->ctrl_refs.prev)) {
1258 list_add_tail(&new_ref->node, &hdl->ctrl_refs);
1259 goto insert_in_hash;
1260 }
1261
1262 /* Find insert position in sorted list */
1263 list_for_each_entry(ref, &hdl->ctrl_refs, node) {
1264 if (ref->ctrl->id < id)
1265 continue;
1266 /* Don't add duplicates */
1267 if (ref->ctrl->id == id) {
1268 kfree(new_ref);
1269 goto unlock;
1270 }
1271 list_add(&new_ref->node, ref->node.prev);
1272 break;
1273 }
1274
1275insert_in_hash:
1276 /* Insert the control node in the hash */
1277 new_ref->next = hdl->buckets[bucket];
1278 hdl->buckets[bucket] = new_ref;
1279
1280unlock:
1281 mutex_unlock(&hdl->lock);
1282 return 0;
1283}
1284
1285/* Add a new control */
1286static struct v4l2_ctrl *v4l2_ctrl_new(struct v4l2_ctrl_handler *hdl,
1287 const struct v4l2_ctrl_ops *ops,
1288 u32 id, const char *name, enum v4l2_ctrl_type type,
1289 s32 min, s32 max, u32 step, s32 def,
513521ea 1290 u32 flags, const char * const *qmenu, void *priv)
0996517c
HV		 1291{
1292 struct v4l2_ctrl *ctrl;
1293 unsigned sz_extra = 0;
1294
1295 if (hdl->error)
1296 return NULL;
1297
1298 /* Sanity checks */
1299 if (id == 0 || name == NULL || id >= V4L2_CID_PRIVATE_BASE ||
0996517c 1300 (type == V4L2_CTRL_TYPE_INTEGER && step == 0) ||
fa4d7096 1301 (type == V4L2_CTRL_TYPE_BITMASK && max == 0) ||
0996517c
HV		 1302 (type == V4L2_CTRL_TYPE_MENU && qmenu == NULL) ||
1303 (type == V4L2_CTRL_TYPE_STRING && max == 0)) {
1304 handler_set_err(hdl, -ERANGE);
1305 return NULL;
1306 }
fa4d7096
HV		 1307 if (type != V4L2_CTRL_TYPE_BITMASK && max < min) {
1308 handler_set_err(hdl, -ERANGE);
1309 return NULL;
1310 }
02ac0480
HV		 1311 if ((type == V4L2_CTRL_TYPE_INTEGER ||
1312 type == V4L2_CTRL_TYPE_MENU ||
1313 type == V4L2_CTRL_TYPE_BOOLEAN) &&
1314 (def < min || def > max)) {
1315 handler_set_err(hdl, -ERANGE);
1316 return NULL;
1317 }
fa4d7096
HV		 1318 if (type == V4L2_CTRL_TYPE_BITMASK && ((def & ~max) || min || step)) {
1319 handler_set_err(hdl, -ERANGE);
1320 return NULL;
1321 }
0996517c
HV		 1322
1323 if (type == V4L2_CTRL_TYPE_BUTTON)
1324 flags |= V4L2_CTRL_FLAG_WRITE_ONLY;
1325 else if (type == V4L2_CTRL_TYPE_CTRL_CLASS)
1326 flags |= V4L2_CTRL_FLAG_READ_ONLY;
1327 else if (type == V4L2_CTRL_TYPE_STRING)
1328 sz_extra += 2 * (max + 1);
1329
1330 ctrl = kzalloc(sizeof(*ctrl) + sz_extra, GFP_KERNEL);
1331 if (ctrl == NULL) {
1332 handler_set_err(hdl, -ENOMEM);
1333 return NULL;
1334 }
1335
1336 INIT_LIST_HEAD(&ctrl->node);
77068d36 1337 INIT_LIST_HEAD(&ctrl->ev_subs);
0996517c
HV		 1338 ctrl->handler = hdl;
1339 ctrl->ops = ops;
1340 ctrl->id = id;
1341 ctrl->name = name;
1342 ctrl->type = type;
1343 ctrl->flags = flags;
1344 ctrl->minimum = min;
1345 ctrl->maximum = max;
1346 ctrl->step = step;
1347 ctrl->qmenu = qmenu;
1348 ctrl->priv = priv;
1349 ctrl->cur.val = ctrl->val = ctrl->default_value = def;
1350
1351 if (ctrl->type == V4L2_CTRL_TYPE_STRING) {
1352 ctrl->cur.string = (char *)&ctrl[1] + sz_extra - (max + 1);
1353 ctrl->string = (char *)&ctrl[1] + sz_extra - 2 * (max + 1);
1354 if (ctrl->minimum)
1355 memset(ctrl->cur.string, ' ', ctrl->minimum);
1356 }
1357 if (handler_new_ref(hdl, ctrl)) {
1358 kfree(ctrl);
1359 return NULL;
1360 }
1361 mutex_lock(&hdl->lock);
1362 list_add_tail(&ctrl->node, &hdl->ctrls);
1363 mutex_unlock(&hdl->lock);
1364 return ctrl;
1365}
1366
1367struct v4l2_ctrl *v4l2_ctrl_new_custom(struct v4l2_ctrl_handler *hdl,
1368 const struct v4l2_ctrl_config *cfg, void *priv)
1369{
1370 bool is_menu;
1371 struct v4l2_ctrl *ctrl;
1372 const char *name = cfg->name;
513521ea 1373 const char * const *qmenu = cfg->qmenu;
0996517c
HV		 1374 enum v4l2_ctrl_type type = cfg->type;
1375 u32 flags = cfg->flags;
1376 s32 min = cfg->min;
1377 s32 max = cfg->max;
1378 u32 step = cfg->step;
1379 s32 def = cfg->def;
1380
1381 if (name == NULL)
1382 v4l2_ctrl_fill(cfg->id, &name, &type, &min, &max, &step,
1383 &def, &flags);
1384
1385 is_menu = (cfg->type == V4L2_CTRL_TYPE_MENU);
1386 if (is_menu)
1387 WARN_ON(step);
1388 else
1389 WARN_ON(cfg->menu_skip_mask);
1390 if (is_menu && qmenu == NULL)
1391 qmenu = v4l2_ctrl_get_menu(cfg->id);
1392
1393 ctrl = v4l2_ctrl_new(hdl, cfg->ops, cfg->id, name,
1394 type, min, max,
1395 is_menu ? cfg->menu_skip_mask : step,
1396 def, flags, qmenu, priv);
1397 if (ctrl) {
1398 ctrl->is_private = cfg->is_private;
1399 ctrl->is_volatile = cfg->is_volatile;
1400 }
1401 return ctrl;
1402}
1403EXPORT_SYMBOL(v4l2_ctrl_new_custom);
1404
1405/* Helper function for standard non-menu controls */
1406struct v4l2_ctrl *v4l2_ctrl_new_std(struct v4l2_ctrl_handler *hdl,
1407 const struct v4l2_ctrl_ops *ops,
1408 u32 id, s32 min, s32 max, u32 step, s32 def)
1409{
1410 const char *name;
1411 enum v4l2_ctrl_type type;
1412 u32 flags;
1413
1414 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
1415 if (type == V4L2_CTRL_TYPE_MENU) {
1416 handler_set_err(hdl, -EINVAL);
1417 return NULL;
1418 }
1419 return v4l2_ctrl_new(hdl, ops, id, name, type,
1420 min, max, step, def, flags, NULL, NULL);
1421}
1422EXPORT_SYMBOL(v4l2_ctrl_new_std);
1423
1424/* Helper function for standard menu controls */
1425struct v4l2_ctrl *v4l2_ctrl_new_std_menu(struct v4l2_ctrl_handler *hdl,
1426 const struct v4l2_ctrl_ops *ops,
1427 u32 id, s32 max, s32 mask, s32 def)
1428{
513521ea 1429 const char * const *qmenu = v4l2_ctrl_get_menu(id);
0996517c
HV		 1430 const char *name;
1431 enum v4l2_ctrl_type type;
1432 s32 min;
1433 s32 step;
1434 u32 flags;
1435
1436 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
1437 if (type != V4L2_CTRL_TYPE_MENU) {
1438 handler_set_err(hdl, -EINVAL);
1439 return NULL;
1440 }
1441 return v4l2_ctrl_new(hdl, ops, id, name, type,
1442 0, max, mask, def, flags, qmenu, NULL);
1443}
1444EXPORT_SYMBOL(v4l2_ctrl_new_std_menu);
1445
1446/* Add a control from another handler to this handler */
1447struct v4l2_ctrl *v4l2_ctrl_add_ctrl(struct v4l2_ctrl_handler *hdl,
1448 struct v4l2_ctrl *ctrl)
1449{
1450 if (hdl == NULL || hdl->error)
1451 return NULL;
1452 if (ctrl == NULL) {
1453 handler_set_err(hdl, -EINVAL);
1454 return NULL;
1455 }
1456 if (ctrl->handler == hdl)
1457 return ctrl;
1458 return handler_new_ref(hdl, ctrl) ? NULL : ctrl;
1459}
1460EXPORT_SYMBOL(v4l2_ctrl_add_ctrl);
1461
1462/* Add the controls from another handler to our own. */
1463int v4l2_ctrl_add_handler(struct v4l2_ctrl_handler *hdl,
1464 struct v4l2_ctrl_handler *add)
1465{
1466 struct v4l2_ctrl *ctrl;
1467 int ret = 0;
1468
1469 /* Do nothing if either handler is NULL or if they are the same */
1470 if (!hdl || !add || hdl == add)
1471 return 0;
1472 if (hdl->error)
1473 return hdl->error;
1474 mutex_lock(&add->lock);
1475 list_for_each_entry(ctrl, &add->ctrls, node) {
1476 /* Skip handler-private controls. */
1477 if (ctrl->is_private)
1478 continue;
6e239399
HV		 1479 /* And control classes */
1480 if (ctrl->type == V4L2_CTRL_TYPE_CTRL_CLASS)
1481 continue;
0996517c
HV		 1482 ret = handler_new_ref(hdl, ctrl);
1483 if (ret)
1484 break;
1485 }
1486 mutex_unlock(&add->lock);
1487 return ret;
1488}
1489EXPORT_SYMBOL(v4l2_ctrl_add_handler);
1490
1491/* Cluster controls */
1492void v4l2_ctrl_cluster(unsigned ncontrols, struct v4l2_ctrl **controls)
1493{
1494 int i;
1495
1496 /* The first control is the master control and it must not be NULL */
72d877ca 1497 BUG_ON(ncontrols == 0 || controls[0] == NULL);
0996517c
HV		 1498
1499 for (i = 0; i < ncontrols; i++) {
1500 if (controls[i]) {
1501 controls[i]->cluster = controls;
1502 controls[i]->ncontrols = ncontrols;
1503 }
1504 }
1505}
1506EXPORT_SYMBOL(v4l2_ctrl_cluster);
1507
72d877ca
HV		 1508void v4l2_ctrl_auto_cluster(unsigned ncontrols, struct v4l2_ctrl **controls,
1509 u8 manual_val, bool set_volatile)
1510{
1511 struct v4l2_ctrl *master = controls[0];
1512 u32 flag;
1513 int i;
1514
1515 v4l2_ctrl_cluster(ncontrols, controls);
1516 WARN_ON(ncontrols <= 1);
82a7c049 1517 WARN_ON(manual_val < master->minimum || manual_val > master->maximum);
72d877ca
HV		 1518 master->is_auto = true;
1519 master->manual_mode_value = manual_val;
1520 master->flags |= V4L2_CTRL_FLAG_UPDATE;
1521 flag = is_cur_manual(master) ? 0 : V4L2_CTRL_FLAG_INACTIVE;
1522
1523 for (i = 1; i < ncontrols; i++)
1524 if (controls[i]) {
1525 controls[i]->is_volatile = set_volatile;
1526 controls[i]->flags |= flag;
1527 }
1528}
1529EXPORT_SYMBOL(v4l2_ctrl_auto_cluster);
1530
0996517c
HV		 1531/* Activate/deactivate a control. */
1532void v4l2_ctrl_activate(struct v4l2_ctrl *ctrl, bool active)
1533{
6e239399
HV		 1534 /* invert since the actual flag is called 'inactive' */
1535 bool inactive = !active;
1536 bool old;
1537
0996517c
HV		 1538 if (ctrl == NULL)
1539 return;
1540
6e239399 1541 if (inactive)
0996517c 1542 /* set V4L2_CTRL_FLAG_INACTIVE */
6e239399 1543 old = test_and_set_bit(4, &ctrl->flags);
0996517c
HV		 1544 else
1545 /* clear V4L2_CTRL_FLAG_INACTIVE */
6e239399
HV		 1546 old = test_and_clear_bit(4, &ctrl->flags);
1547 if (old != inactive)
1548 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_FLAGS);
0996517c
HV		 1549}
1550EXPORT_SYMBOL(v4l2_ctrl_activate);
1551
1552/* Grab/ungrab a control.
1553 Typically used when streaming starts and you want to grab controls,
1554 preventing the user from changing them.
1555
1556 Just call this and the framework will block any attempts to change
1557 these controls. */
1558void v4l2_ctrl_grab(struct v4l2_ctrl *ctrl, bool grabbed)
1559{
6e239399
HV		 1560 bool old;
1561
0996517c
HV		 1562 if (ctrl == NULL)
1563 return;
1564
6e239399 1565 v4l2_ctrl_lock(ctrl);
0996517c
HV		 1566 if (grabbed)
1567 /* set V4L2_CTRL_FLAG_GRABBED */
6e239399 1568 old = test_and_set_bit(1, &ctrl->flags);
0996517c
HV		 1569 else
1570 /* clear V4L2_CTRL_FLAG_GRABBED */
6e239399
HV		 1571 old = test_and_clear_bit(1, &ctrl->flags);
1572 if (old != grabbed)
1573 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_FLAGS);
1574 v4l2_ctrl_unlock(ctrl);
0996517c
HV		 1575}
1576EXPORT_SYMBOL(v4l2_ctrl_grab);
1577
1578/* Log the control name and value */
1579static void log_ctrl(const struct v4l2_ctrl *ctrl,
1580 const char *prefix, const char *colon)
1581{
1582 int fl_inact = ctrl->flags & V4L2_CTRL_FLAG_INACTIVE;
1583 int fl_grabbed = ctrl->flags & V4L2_CTRL_FLAG_GRABBED;
1584
1585 if (ctrl->flags & (V4L2_CTRL_FLAG_DISABLED | V4L2_CTRL_FLAG_WRITE_ONLY))
1586 return;
1587 if (ctrl->type == V4L2_CTRL_TYPE_CTRL_CLASS)
1588 return;
1589
1590 printk(KERN_INFO "%s%s%s: ", prefix, colon, ctrl->name);
1591
1592 switch (ctrl->type) {
1593 case V4L2_CTRL_TYPE_INTEGER:
1594 printk(KERN_CONT "%d", ctrl->cur.val);
1595 break;
1596 case V4L2_CTRL_TYPE_BOOLEAN:
1597 printk(KERN_CONT "%s", ctrl->cur.val ? "true" : "false");
1598 break;
1599 case V4L2_CTRL_TYPE_MENU:
1600 printk(KERN_CONT "%s", ctrl->qmenu[ctrl->cur.val]);
1601 break;
fa4d7096
HV		 1602 case V4L2_CTRL_TYPE_BITMASK:
1603 printk(KERN_CONT "0x%08x", ctrl->cur.val);
1604 break;
0996517c
HV		 1605 case V4L2_CTRL_TYPE_INTEGER64:
1606 printk(KERN_CONT "%lld", ctrl->cur.val64);
1607 break;
1608 case V4L2_CTRL_TYPE_STRING:
1609 printk(KERN_CONT "%s", ctrl->cur.string);
1610 break;
1611 default:
1612 printk(KERN_CONT "unknown type %d", ctrl->type);
1613 break;
1614 }
1615 if (fl_inact && fl_grabbed)
1616 printk(KERN_CONT " (inactive, grabbed)\n");
1617 else if (fl_inact)
1618 printk(KERN_CONT " (inactive)\n");
1619 else if (fl_grabbed)
1620 printk(KERN_CONT " (grabbed)\n");
1621 else
1622 printk(KERN_CONT "\n");
1623}
1624
1625/* Log all controls owned by the handler */
1626void v4l2_ctrl_handler_log_status(struct v4l2_ctrl_handler *hdl,
1627 const char *prefix)
1628{
1629 struct v4l2_ctrl *ctrl;
1630 const char *colon = "";
1631 int len;
1632
1633 if (hdl == NULL)
1634 return;
1635 if (prefix == NULL)
1636 prefix = "";
1637 len = strlen(prefix);
1638 if (len && prefix[len - 1] != ' ')
1639 colon = ": ";
1640 mutex_lock(&hdl->lock);
1641 list_for_each_entry(ctrl, &hdl->ctrls, node)
1642 if (!(ctrl->flags & V4L2_CTRL_FLAG_DISABLED))
1643 log_ctrl(ctrl, prefix, colon);
1644 mutex_unlock(&hdl->lock);
1645}
1646EXPORT_SYMBOL(v4l2_ctrl_handler_log_status);
1647
1648/* Call s_ctrl for all controls owned by the handler */
1649int v4l2_ctrl_handler_setup(struct v4l2_ctrl_handler *hdl)
1650{
1651 struct v4l2_ctrl *ctrl;
1652 int ret = 0;
1653
1654 if (hdl == NULL)
1655 return 0;
1656 mutex_lock(&hdl->lock);
1657 list_for_each_entry(ctrl, &hdl->ctrls, node)
1658 ctrl->done = false;
1659
1660 list_for_each_entry(ctrl, &hdl->ctrls, node) {
1661 struct v4l2_ctrl *master = ctrl->cluster[0];
1662 int i;
1663
1664 /* Skip if this control was already handled by a cluster. */
71c6c4c9
HV		 1665 /* Skip button controls and read-only controls. */
1666 if (ctrl->done || ctrl->type == V4L2_CTRL_TYPE_BUTTON ||
1667 (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY))
0996517c
HV		 1668 continue;
1669
2a863793
HV		 1670 for (i = 0; i < master->ncontrols; i++) {
1671 if (master->cluster[i]) {
1672 cur_to_new(master->cluster[i]);
1673 master->cluster[i]->is_new = 1;
71c6c4c9 1674 master->cluster[i]->done = true;
2a863793
HV		 1675 }
1676 }
54c911eb 1677 ret = call_op(master, s_ctrl);
0996517c
HV		 1678 if (ret)
1679 break;
0996517c
HV		 1680 }
1681 mutex_unlock(&hdl->lock);
1682 return ret;
1683}
1684EXPORT_SYMBOL(v4l2_ctrl_handler_setup);
1685
1686/* Implement VIDIOC_QUERYCTRL */
1687int v4l2_queryctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_queryctrl *qc)
1688{
1689 u32 id = qc->id & V4L2_CTRL_ID_MASK;
1690 struct v4l2_ctrl_ref *ref;
1691 struct v4l2_ctrl *ctrl;
1692
1693 if (hdl == NULL)
1694 return -EINVAL;
1695
1696 mutex_lock(&hdl->lock);
1697
1698 /* Try to find it */
1699 ref = find_ref(hdl, id);
1700
1701 if ((qc->id & V4L2_CTRL_FLAG_NEXT_CTRL) && !list_empty(&hdl->ctrl_refs)) {
1702 /* Find the next control with ID > qc->id */
1703
1704 /* Did we reach the end of the control list? */
1705 if (id >= node2id(hdl->ctrl_refs.prev)) {
1706 ref = NULL; /* Yes, so there is no next control */
1707 } else if (ref) {
1708 /* We found a control with the given ID, so just get
1709 the next one in the list. */
1710 ref = list_entry(ref->node.next, typeof(*ref), node);
1711 } else {
1712 /* No control with the given ID exists, so start
1713 searching for the next largest ID. We know there
1714 is one, otherwise the first 'if' above would have
1715 been true. */
1716 list_for_each_entry(ref, &hdl->ctrl_refs, node)
1717 if (id < ref->ctrl->id)
1718 break;
1719 }
1720 }
1721 mutex_unlock(&hdl->lock);
1722 if (!ref)
1723 return -EINVAL;
1724
1725 ctrl = ref->ctrl;
1726 memset(qc, 0, sizeof(*qc));
829fb2dc
HV		 1727 if (id >= V4L2_CID_PRIVATE_BASE)
1728 qc->id = id;
1729 else
1730 qc->id = ctrl->id;
0996517c
HV		 1731 strlcpy(qc->name, ctrl->name, sizeof(qc->name));
1732 qc->minimum = ctrl->minimum;
1733 qc->maximum = ctrl->maximum;
1734 qc->default_value = ctrl->default_value;
eac9aa00 1735 if (ctrl->type == V4L2_CTRL_TYPE_MENU)
0996517c
HV		 1736 qc->step = 1;
1737 else
1738 qc->step = ctrl->step;
1739 qc->flags = ctrl->flags;
1740 qc->type = ctrl->type;
1741 return 0;
1742}
1743EXPORT_SYMBOL(v4l2_queryctrl);
1744
1745int v4l2_subdev_queryctrl(struct v4l2_subdev *sd, struct v4l2_queryctrl *qc)
1746{
87a0c94c
HV		 1747 if (qc->id & V4L2_CTRL_FLAG_NEXT_CTRL)
1748 return -EINVAL;
0996517c
HV		 1749 return v4l2_queryctrl(sd->ctrl_handler, qc);
1750}
1751EXPORT_SYMBOL(v4l2_subdev_queryctrl);
1752
1753/* Implement VIDIOC_QUERYMENU */
1754int v4l2_querymenu(struct v4l2_ctrl_handler *hdl, struct v4l2_querymenu *qm)
1755{
1756 struct v4l2_ctrl *ctrl;
1757 u32 i = qm->index;
1758
1759 ctrl = v4l2_ctrl_find(hdl, qm->id);
1760 if (!ctrl)
1761 return -EINVAL;
1762
1763 qm->reserved = 0;
1764 /* Sanity checks */
1765 if (ctrl->qmenu == NULL ||
1766 i < ctrl->minimum || i > ctrl->maximum)
1767 return -EINVAL;
1768 /* Use mask to see if this menu item should be skipped */
1769 if (ctrl->menu_skip_mask & (1 << i))
1770 return -EINVAL;
1771 /* Empty menu items should also be skipped */
1772 if (ctrl->qmenu[i] == NULL || ctrl->qmenu[i][0] == '\0')
1773 return -EINVAL;
1774 strlcpy(qm->name, ctrl->qmenu[i], sizeof(qm->name));
1775 return 0;
1776}
1777EXPORT_SYMBOL(v4l2_querymenu);
1778
1779int v4l2_subdev_querymenu(struct v4l2_subdev *sd, struct v4l2_querymenu *qm)
1780{
1781 return v4l2_querymenu(sd->ctrl_handler, qm);
1782}
1783EXPORT_SYMBOL(v4l2_subdev_querymenu);
1784
1785
1786
1787/* Some general notes on the atomic requirements of VIDIOC_G/TRY/S_EXT_CTRLS:
1788
1789 It is not a fully atomic operation, just best-effort only. After all, if
1790 multiple controls have to be set through multiple i2c writes (for example)
1791 then some initial writes may succeed while others fail. Thus leaving the
1792 system in an inconsistent state. The question is how much effort you are
1793 willing to spend on trying to make something atomic that really isn't.
1794
1795 From the point of view of an application the main requirement is that
1796 when you call VIDIOC_S_EXT_CTRLS and some values are invalid then an
1797 error should be returned without actually affecting any controls.
1798
1799 If all the values are correct, then it is acceptable to just give up
1800 in case of low-level errors.
1801
1802 It is important though that the application can tell when only a partial
1803 configuration was done. The way we do that is through the error_idx field
1804 of struct v4l2_ext_controls: if that is equal to the count field then no
1805 controls were affected. Otherwise all controls before that index were
1806 successful in performing their 'get' or 'set' operation, the control at
1807 the given index failed, and you don't know what happened with the controls
1808 after the failed one. Since if they were part of a control cluster they
1809 could have been successfully processed (if a cluster member was encountered
1810 at index < error_idx), they could have failed (if a cluster member was at
1811 error_idx), or they may not have been processed yet (if the first cluster
1812 member appeared after error_idx).
1813
1814 It is all fairly theoretical, though. In practice all you can do is to
1815 bail out. If error_idx == count, then it is an application bug. If
1816 error_idx < count then it is only an application bug if the error code was
1817 EBUSY. That usually means that something started streaming just when you
1818 tried to set the controls. In all other cases it is a driver/hardware
1819 problem and all you can do is to retry or bail out.
1820
1821 Note that these rules do not apply to VIDIOC_TRY_EXT_CTRLS: since that
1822 never modifies controls the error_idx is just set to whatever control
1823 has an invalid value.
1824 */
1825
1826/* Prepare for the extended g/s/try functions.
1827 Find the controls in the control array and do some basic checks. */
1828static int prepare_ext_ctrls(struct v4l2_ctrl_handler *hdl,
1829 struct v4l2_ext_controls *cs,
eb5b16ef 1830 struct v4l2_ctrl_helper *helpers)
0996517c 1831{
eb5b16ef
HV		 1832 struct v4l2_ctrl_helper *h;
1833 bool have_clusters = false;
0996517c
HV		 1834 u32 i;
1835
eb5b16ef 1836 for (i = 0, h = helpers; i < cs->count; i++, h++) {
0996517c 1837 struct v4l2_ext_control *c = &cs->controls[i];
eb5b16ef 1838 struct v4l2_ctrl_ref *ref;
0996517c
HV		 1839 struct v4l2_ctrl *ctrl;
1840 u32 id = c->id & V4L2_CTRL_ID_MASK;
1841
37cd3b73 1842 cs->error_idx = i;
0996517c
HV		 1843
1844 if (cs->ctrl_class && V4L2_CTRL_ID2CLASS(id) != cs->ctrl_class)
1845 return -EINVAL;
1846
1847 /* Old-style private controls are not allowed for
1848 extended controls */
1849 if (id >= V4L2_CID_PRIVATE_BASE)
1850 return -EINVAL;
eb5b16ef
HV		 1851 ref = find_ref_lock(hdl, id);
1852 if (ref == NULL)
0996517c 1853 return -EINVAL;
eb5b16ef 1854 ctrl = ref->ctrl;
0996517c
HV		 1855 if (ctrl->flags & V4L2_CTRL_FLAG_DISABLED)
1856 return -EINVAL;
1857
eb5b16ef
HV		 1858 if (ctrl->cluster[0]->ncontrols > 1)
1859 have_clusters = true;
1860 if (ctrl->cluster[0] != ctrl)
1861 ref = find_ref_lock(hdl, ctrl->cluster[0]->id);
1862 /* Store the ref to the master control of the cluster */
1863 h->mref = ref;
1864 h->ctrl = ctrl;
1865 /* Initially set next to 0, meaning that there is no other
1866 control in this helper array belonging to the same
1867 cluster */
1868 h->next = 0;
0996517c 1869 }
0996517c 1870
eb5b16ef
HV		 1871 /* We are done if there were no controls that belong to a multi-
1872 control cluster. */
1873 if (!have_clusters)
1874 return 0;
0996517c 1875
eb5b16ef
HV		 1876 /* The code below figures out in O(n) time which controls in the list
1877 belong to the same cluster. */
0996517c 1878
eb5b16ef
HV		 1879 /* This has to be done with the handler lock taken. */
1880 mutex_lock(&hdl->lock);
0996517c 1881
eb5b16ef
HV		 1882 /* First zero the helper field in the master control references */
1883 for (i = 0; i < cs->count; i++)
1884 helpers[i].mref->helper = 0;
1885 for (i = 0, h = helpers; i < cs->count; i++, h++) {
1886 struct v4l2_ctrl_ref *mref = h->mref;
1887
1888 /* If the mref->helper is set, then it points to an earlier
1889 helper that belongs to the same cluster. */
1890 if (mref->helper) {
1891 /* Set the next field of mref->helper to the current
1892 index: this means that that earlier helper now
1893 points to the next helper in the same cluster. */
1894 mref->helper->next = i;
1895 /* mref should be set only for the first helper in the
1896 cluster, clear the others. */
1897 h->mref = NULL;
1898 }
1899 /* Point the mref helper to the current helper struct. */
1900 mref->helper = h;
0996517c 1901 }
eb5b16ef
HV		 1902 mutex_unlock(&hdl->lock);
1903 return 0;
0996517c
HV		 1904}
1905
1906/* Handles the corner case where cs->count == 0. It checks whether the
1907 specified control class exists. If that class ID is 0, then it checks
1908 whether there are any controls at all. */
1909static int class_check(struct v4l2_ctrl_handler *hdl, u32 ctrl_class)
1910{
1911 if (ctrl_class == 0)
1912 return list_empty(&hdl->ctrl_refs) ? -EINVAL : 0;
1913 return find_ref_lock(hdl, ctrl_class | 1) ? 0 : -EINVAL;
1914}
1915
1916
1917
1918/* Get extended controls. Allocates the helpers array if needed. */
1919int v4l2_g_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *cs)
1920{
eb5b16ef
HV		 1921 struct v4l2_ctrl_helper helper[4];
1922 struct v4l2_ctrl_helper *helpers = helper;
0996517c 1923 int ret;
ddac5c10 1924 int i, j;
0996517c
HV		 1925
1926 cs->error_idx = cs->count;
1927 cs->ctrl_class = V4L2_CTRL_ID2CLASS(cs->ctrl_class);
1928
1929 if (hdl == NULL)
1930 return -EINVAL;
1931
1932 if (cs->count == 0)
1933 return class_check(hdl, cs->ctrl_class);
1934
1935 if (cs->count > ARRAY_SIZE(helper)) {
1936 helpers = kmalloc(sizeof(helper[0]) * cs->count, GFP_KERNEL);
1937 if (helpers == NULL)
1938 return -ENOMEM;
1939 }
1940
37cd3b73
HV		 1941 ret = prepare_ext_ctrls(hdl, cs, helpers);
1942 cs->error_idx = cs->count;
0996517c
HV		 1943
1944 for (i = 0; !ret && i < cs->count; i++)
1945 if (helpers[i].ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY)
1946 ret = -EACCES;
1947
1948 for (i = 0; !ret && i < cs->count; i++) {
eb5b16ef
HV		 1949 int (*ctrl_to_user)(struct v4l2_ext_control *c,
1950 struct v4l2_ctrl *ctrl) = cur_to_user;
1951 struct v4l2_ctrl *master;
0996517c 1952
eb5b16ef 1953 if (helpers[i].mref == NULL)
0996517c
HV		 1954 continue;
1955
eb5b16ef 1956 master = helpers[i].mref->ctrl;
0996517c
HV		 1957 cs->error_idx = i;
1958
1959 v4l2_ctrl_lock(master);
ddac5c10
HV		 1960
1961 /* g_volatile_ctrl will update the new control values */
eb5b16ef 1962 if (has_op(master, g_volatile_ctrl) && !is_cur_manual(master)) {
ddac5c10
HV		 1963 for (j = 0; j < master->ncontrols; j++)
1964 cur_to_new(master->cluster[j]);
54c911eb 1965 ret = call_op(master, g_volatile_ctrl);
eb5b16ef 1966 ctrl_to_user = new_to_user;
ddac5c10
HV		 1967 }
1968 /* If OK, then copy the current (for non-volatile controls)
1969 or the new (for volatile controls) control values to the
1970 caller */
eb5b16ef
HV		 1971 if (!ret) {
1972 u32 idx = i;
1973
1974 do {
1975 ret = ctrl_to_user(cs->controls + idx,
1976 helpers[idx].ctrl);
1977 idx = helpers[idx].next;
1978 } while (!ret && idx);
1979 }
0996517c 1980 v4l2_ctrl_unlock(master);
0996517c
HV		 1981 }
1982
1983 if (cs->count > ARRAY_SIZE(helper))
1984 kfree(helpers);
1985 return ret;
1986}
1987EXPORT_SYMBOL(v4l2_g_ext_ctrls);
1988
1989int v4l2_subdev_g_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs)
1990{
1991 return v4l2_g_ext_ctrls(sd->ctrl_handler, cs);
1992}
1993EXPORT_SYMBOL(v4l2_subdev_g_ext_ctrls);
1994
1995/* Helper function to get a single control */
1996static int get_ctrl(struct v4l2_ctrl *ctrl, s32 *val)
1997{
1998 struct v4l2_ctrl *master = ctrl->cluster[0];
1999 int ret = 0;
ddac5c10 2000 int i;
0996517c
HV		 2001
2002 if (ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY)
2003 return -EACCES;
2004
2005 v4l2_ctrl_lock(master);
2006 /* g_volatile_ctrl will update the current control values */
72d877ca 2007 if (ctrl->is_volatile && !is_cur_manual(master)) {
ddac5c10
HV		 2008 for (i = 0; i < master->ncontrols; i++)
2009 cur_to_new(master->cluster[i]);
54c911eb 2010 ret = call_op(master, g_volatile_ctrl);
ddac5c10
HV		 2011 *val = ctrl->val;
2012 } else {
2013 *val = ctrl->cur.val;
2014 }
0996517c
HV		 2015 v4l2_ctrl_unlock(master);
2016 return ret;
2017}
2018
2019int v4l2_g_ctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_control *control)
2020{
2021 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, control->id);
2022
2023 if (ctrl == NULL || !type_is_int(ctrl))
2024 return -EINVAL;
2025 return get_ctrl(ctrl, &control->value);
2026}
2027EXPORT_SYMBOL(v4l2_g_ctrl);
2028
2029int v4l2_subdev_g_ctrl(struct v4l2_subdev *sd, struct v4l2_control *control)
2030{
2031 return v4l2_g_ctrl(sd->ctrl_handler, control);
2032}
2033EXPORT_SYMBOL(v4l2_subdev_g_ctrl);
2034
2035s32 v4l2_ctrl_g_ctrl(struct v4l2_ctrl *ctrl)
2036{
2037 s32 val = 0;
2038
2039 /* It's a driver bug if this happens. */
2040 WARN_ON(!type_is_int(ctrl));
2041 get_ctrl(ctrl, &val);
2042 return val;
2043}
2044EXPORT_SYMBOL(v4l2_ctrl_g_ctrl);
2045
2046
2047/* Core function that calls try/s_ctrl and ensures that the new value is
2048 copied to the current value on a set.
2049 Must be called with ctrl->handler->lock held. */
e6402585
HV		 2050static int try_or_set_cluster(struct v4l2_fh *fh,
2051 struct v4l2_ctrl *master, bool set)
0996517c 2052{
72d877ca 2053 bool update_flag;
eb5b16ef 2054 int ret;
0996517c
HV		 2055 int i;
2056
2057 /* Go through the cluster and either validate the new value or
2058 (if no new value was set), copy the current value to the new
2059 value, ensuring a consistent view for the control ops when
2060 called. */
eb5b16ef 2061 for (i = 0; i < master->ncontrols; i++) {
0996517c
HV		 2062 struct v4l2_ctrl *ctrl = master->cluster[i];
2063
2064 if (ctrl == NULL)
2065 continue;
2066
eb5b16ef
HV		 2067 if (!ctrl->is_new) {
2068 cur_to_new(ctrl);
0996517c
HV		 2069 continue;
2070 }
eb5b16ef
HV		 2071 /* Check again: it may have changed since the
2072 previous check in try_or_set_ext_ctrls(). */
2073 if (set && (ctrl->flags & V4L2_CTRL_FLAG_GRABBED))
2074 return -EBUSY;
0996517c
HV		 2075 }
2076
eb5b16ef 2077 ret = call_op(master, try_ctrl);
0996517c
HV		 2078
2079 /* Don't set if there is no change */
72d877ca
HV		 2080 if (ret || !set || !cluster_changed(master))
2081 return ret;
2082 ret = call_op(master, s_ctrl);
72d877ca
HV		 2083 if (ret)
2084 return ret;
2085
eb5b16ef 2086 /* If OK, then make the new values permanent. */
72d877ca
HV		 2087 update_flag = is_cur_manual(master) != is_new_manual(master);
2088 for (i = 0; i < master->ncontrols; i++)
ab892bac 2089 new_to_cur(fh, master->cluster[i], update_flag && i > 0);
72d877ca 2090 return 0;
0996517c
HV		 2091}
2092
e6402585
HV		 2093/* Validate controls. */
2094static int validate_ctrls(struct v4l2_ext_controls *cs,
2095 struct v4l2_ctrl_helper *helpers, bool set)
0996517c 2096{
e6402585 2097 unsigned i;
0996517c
HV		 2098 int ret = 0;
2099
eb5b16ef 2100 cs->error_idx = cs->count;
0996517c
HV		 2101 for (i = 0; i < cs->count; i++) {
2102 struct v4l2_ctrl *ctrl = helpers[i].ctrl;
2103
e6402585 2104 cs->error_idx = i;
0996517c
HV		 2105
2106 if (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY)
2107 return -EACCES;
2108 /* This test is also done in try_set_control_cluster() which
2109 is called in atomic context, so that has the final say,
2110 but it makes sense to do an up-front check as well. Once
2111 an error occurs in try_set_control_cluster() some other
2112 controls may have been set already and we want to do a
2113 best-effort to avoid that. */
2114 if (set && (ctrl->flags & V4L2_CTRL_FLAG_GRABBED))
2115 return -EBUSY;
eb5b16ef
HV		 2116 ret = validate_new(ctrl, &cs->controls[i]);
2117 if (ret)
2118 return ret;
0996517c 2119 }
e6402585
HV		 2120 return 0;
2121}
2122
2123/* Try or try-and-set controls */
2124static int try_set_ext_ctrls(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
2125 struct v4l2_ext_controls *cs,
2126 bool set)
2127{
2128 struct v4l2_ctrl_helper helper[4];
2129 struct v4l2_ctrl_helper *helpers = helper;
2130 unsigned i, j;
2131 int ret;
2132
2133 cs->error_idx = cs->count;
2134 cs->ctrl_class = V4L2_CTRL_ID2CLASS(cs->ctrl_class);
2135
2136 if (hdl == NULL)
2137 return -EINVAL;
2138
2139 if (cs->count == 0)
2140 return class_check(hdl, cs->ctrl_class);
0996517c 2141
e6402585
HV		 2142 if (cs->count > ARRAY_SIZE(helper)) {
2143 helpers = kmalloc(sizeof(helper[0]) * cs->count, GFP_KERNEL);
2144 if (!helpers)
2145 return -ENOMEM;
2146 }
2147 ret = prepare_ext_ctrls(hdl, cs, helpers);
2148 if (!ret)
2149 ret = validate_ctrls(cs, helpers, set);
2150 if (ret && set)
2151 cs->error_idx = cs->count;
0996517c 2152 for (i = 0; !ret && i < cs->count; i++) {
eb5b16ef
HV		 2153 struct v4l2_ctrl *master;
2154 u32 idx = i;
0996517c 2155
eb5b16ef 2156 if (helpers[i].mref == NULL)
0996517c
HV		 2157 continue;
2158
37cd3b73 2159 cs->error_idx = i;
eb5b16ef
HV		 2160 master = helpers[i].mref->ctrl;
2161 v4l2_ctrl_lock(master);
0996517c 2162
2a863793 2163 /* Reset the 'is_new' flags of the cluster */
0996517c
HV		 2164 for (j = 0; j < master->ncontrols; j++)
2165 if (master->cluster[j])
2a863793 2166 master->cluster[j]->is_new = 0;
0996517c
HV		 2167
2168 /* Copy the new caller-supplied control values.
2a863793 2169 user_to_new() sets 'is_new' to 1. */
eb5b16ef
HV		 2170 do {
2171 ret = user_to_new(cs->controls + idx, helpers[idx].ctrl);
2172 idx = helpers[idx].next;
2173 } while (!ret && idx);
0996517c
HV		 2174
2175 if (!ret)
e6402585 2176 ret = try_or_set_cluster(fh, master, set);
0996517c
HV		 2177
2178 /* Copy the new values back to userspace. */
eb5b16ef
HV		 2179 if (!ret) {
2180 idx = i;
2181 do {
adf41b9b 2182 ret = new_to_user(cs->controls + idx,
e6402585 2183 helpers[idx].ctrl);
eb5b16ef
HV		 2184 idx = helpers[idx].next;
2185 } while (!ret && idx);
2186 }
2187 v4l2_ctrl_unlock(master);
0996517c 2188 }
0996517c 2189
0996517c
HV		 2190 if (cs->count > ARRAY_SIZE(helper))
2191 kfree(helpers);
2192 return ret;
2193}
2194
2195int v4l2_try_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *cs)
2196{
ab892bac 2197 return try_set_ext_ctrls(NULL, hdl, cs, false);
0996517c
HV		 2198}
2199EXPORT_SYMBOL(v4l2_try_ext_ctrls);
2200
ab892bac
HV		 2201int v4l2_s_ext_ctrls(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
2202 struct v4l2_ext_controls *cs)
0996517c 2203{
ab892bac 2204 return try_set_ext_ctrls(fh, hdl, cs, true);
0996517c
HV		 2205}
2206EXPORT_SYMBOL(v4l2_s_ext_ctrls);
2207
2208int v4l2_subdev_try_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs)
2209{
ab892bac 2210 return try_set_ext_ctrls(NULL, sd->ctrl_handler, cs, false);
0996517c
HV		 2211}
2212EXPORT_SYMBOL(v4l2_subdev_try_ext_ctrls);
2213
2214int v4l2_subdev_s_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs)
2215{
ab892bac 2216 return try_set_ext_ctrls(NULL, sd->ctrl_handler, cs, true);
0996517c
HV		 2217}
2218EXPORT_SYMBOL(v4l2_subdev_s_ext_ctrls);
2219
2220/* Helper function for VIDIOC_S_CTRL compatibility */
ab892bac 2221static int set_ctrl(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, s32 *val)
0996517c
HV		 2222{
2223 struct v4l2_ctrl *master = ctrl->cluster[0];
2224 int ret;
2225 int i;
2226
eb5b16ef
HV		 2227 ret = validate_new_int(ctrl, val);
2228 if (ret)
2229 return ret;
2230
0996517c
HV		 2231 v4l2_ctrl_lock(ctrl);
2232
2a863793 2233 /* Reset the 'is_new' flags of the cluster */
0996517c
HV		 2234 for (i = 0; i < master->ncontrols; i++)
2235 if (master->cluster[i])
2a863793 2236 master->cluster[i]->is_new = 0;
0996517c
HV		 2237
2238 ctrl->val = *val;
2a863793 2239 ctrl->is_new = 1;
e6402585 2240 ret = try_or_set_cluster(fh, master, true);
0996517c
HV		 2241 *val = ctrl->cur.val;
2242 v4l2_ctrl_unlock(ctrl);
2243 return ret;
2244}
2245
ab892bac
HV		 2246int v4l2_s_ctrl(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
2247 struct v4l2_control *control)
0996517c
HV		 2248{
2249 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, control->id);
2250
2251 if (ctrl == NULL || !type_is_int(ctrl))
2252 return -EINVAL;
2253
7ebbc39f
HV		 2254 if (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY)
2255 return -EACCES;
2256
ab892bac 2257 return set_ctrl(fh, ctrl, &control->value);
0996517c
HV		 2258}
2259EXPORT_SYMBOL(v4l2_s_ctrl);
2260
2261int v4l2_subdev_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *control)
2262{
ab892bac 2263 return v4l2_s_ctrl(NULL, sd->ctrl_handler, control);
0996517c
HV		 2264}
2265EXPORT_SYMBOL(v4l2_subdev_s_ctrl);
2266
2267int v4l2_ctrl_s_ctrl(struct v4l2_ctrl *ctrl, s32 val)
2268{
2269 /* It's a driver bug if this happens. */
2270 WARN_ON(!type_is_int(ctrl));
ab892bac 2271 return set_ctrl(NULL, ctrl, &val);
0996517c
HV		 2272}
2273EXPORT_SYMBOL(v4l2_ctrl_s_ctrl);
6e239399 2274
77068d36
HV		 2275void v4l2_ctrl_add_event(struct v4l2_ctrl *ctrl,
2276 struct v4l2_subscribed_event *sev)
6e239399 2277{
6e239399 2278 v4l2_ctrl_lock(ctrl);
77068d36 2279 list_add_tail(&sev->node, &ctrl->ev_subs);
6e239399 2280 if (ctrl->type != V4L2_CTRL_TYPE_CTRL_CLASS &&
77068d36 2281 (sev->flags & V4L2_EVENT_SUB_FL_SEND_INITIAL)) {
6e239399 2282 struct v4l2_event ev;
c12fcfd6 2283 u32 changes = V4L2_EVENT_CTRL_CH_FLAGS;
6e239399 2284
c12fcfd6
HV		 2285 if (!(ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY))
2286 changes |= V4L2_EVENT_CTRL_CH_VALUE;
2287 fill_event(&ev, ctrl, changes);
77068d36 2288 v4l2_event_queue_fh(sev->fh, &ev);
6e239399
HV		 2289 }
2290 v4l2_ctrl_unlock(ctrl);
2291}
77068d36 2292EXPORT_SYMBOL(v4l2_ctrl_add_event);
6e239399 2293
77068d36
HV		 2294void v4l2_ctrl_del_event(struct v4l2_ctrl *ctrl,
2295 struct v4l2_subscribed_event *sev)
6e239399 2296{
6e239399 2297 v4l2_ctrl_lock(ctrl);
77068d36 2298 list_del(&sev->node);
6e239399
HV		 2299 v4l2_ctrl_unlock(ctrl);
2300}
77068d36 2301EXPORT_SYMBOL(v4l2_ctrl_del_event);
Linux 6.x block layer and io_uring tree(s)