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s390/ptrace: get rid of long longs in psw_bits
[linux/fpc-iii.git] / drivers / media / v4l2-core / v4l2-ctrls.c
blob4a1d9fdd14bb1595ff86eb7b72d56b9d507b6128
1 /*
2 V4L2 controls framework implementation.
3
4 Copyright (C) 2010 Hans Verkuil <hverkuil@xs4all.nl>
5
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
10
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 */
20
21 #include <linux/ctype.h>
22 #include <linux/slab.h>
23 #include <linux/export.h>
24 #include <media/v4l2-ioctl.h>
25 #include <media/v4l2-device.h>
26 #include <media/v4l2-ctrls.h>
27 #include <media/v4l2-event.h>
28 #include <media/v4l2-dev.h>
29
30 #define has_op(master, op) \
31 (master->ops && master->ops->op)
32 #define call_op(master, op) \
33 (has_op(master, op) ? master->ops->op(master) : 0)
34
35 /* Internal temporary helper struct, one for each v4l2_ext_control */
36 struct v4l2_ctrl_helper {
37 /* Pointer to the control reference of the master control */
38 struct v4l2_ctrl_ref *mref;
39 /* The control corresponding to the v4l2_ext_control ID field. */
40 struct v4l2_ctrl *ctrl;
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;
44 };
45
46 /* Small helper function to determine if the autocluster is set to manual
47 mode. */
48 static 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. */
55 static bool is_new_manual(const struct v4l2_ctrl *master)
56 {
57 return master->is_auto && master->val == master->manual_mode_value;
58 }
59
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. */
64 const char * const *v4l2_ctrl_get_menu(u32 id)
65 {
66 static const char * const mpeg_audio_sampling_freq[] = {
67 "44.1 kHz",
68 "48 kHz",
69 "32 kHz",
70 NULL
71 };
72 static const char * const mpeg_audio_encoding[] = {
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 };
80 static const char * const mpeg_audio_l1_bitrate[] = {
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 };
97 static const char * const mpeg_audio_l2_bitrate[] = {
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 };
114 static const char * const mpeg_audio_l3_bitrate[] = {
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 };
131 static const char * const mpeg_audio_ac3_bitrate[] = {
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 };
153 static const char * const mpeg_audio_mode[] = {
154 "Stereo",
155 "Joint Stereo",
156 "Dual",
157 "Mono",
158 NULL
159 };
160 static const char * const mpeg_audio_mode_extension[] = {
161 "Bound 4",
162 "Bound 8",
163 "Bound 12",
164 "Bound 16",
165 NULL
166 };
167 static const char * const mpeg_audio_emphasis[] = {
168 "No Emphasis",
169 "50/15 us",
170 "CCITT J17",
171 NULL
172 };
173 static const char * const mpeg_audio_crc[] = {
174 "No CRC",
175 "16-bit CRC",
176 NULL
177 };
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 };
187 static const char * const mpeg_video_encoding[] = {
188 "MPEG-1",
189 "MPEG-2",
190 "MPEG-4 AVC",
191 NULL
192 };
193 static const char * const mpeg_video_aspect[] = {
194 "1x1",
195 "4x3",
196 "16x9",
197 "2.21x1",
198 NULL
199 };
200 static const char * const mpeg_video_bitrate_mode[] = {
201 "Variable Bitrate",
202 "Constant Bitrate",
203 NULL
204 };
205 static const char * const mpeg_stream_type[] = {
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 };
214 static const char * const mpeg_stream_vbi_fmt[] = {
215 "No VBI",
216 "Private Packet, IVTV Format",
217 NULL
218 };
219 static const char * const camera_power_line_frequency[] = {
220 "Disabled",
221 "50 Hz",
222 "60 Hz",
223 "Auto",
224 NULL
225 };
226 static const char * const camera_exposure_auto[] = {
227 "Auto Mode",
228 "Manual Mode",
229 "Shutter Priority Mode",
230 "Aperture Priority Mode",
231 NULL
232 };
233 static const char * const camera_exposure_metering[] = {
234 "Average",
235 "Center Weighted",
236 "Spot",
237 "Matrix",
238 NULL
239 };
240 static const char * const camera_auto_focus_range[] = {
241 "Auto",
242 "Normal",
243 "Macro",
244 "Infinity",
245 NULL
246 };
247 static const char * const colorfx[] = {
248 "None",
249 "Black & White",
250 "Sepia",
251 "Negative",
252 "Emboss",
253 "Sketch",
254 "Sky Blue",
255 "Grass Green",
256 "Skin Whiten",
257 "Vivid",
258 "Aqua",
259 "Art Freeze",
260 "Silhouette",
261 "Solarization",
262 "Antique",
263 "Set Cb/Cr",
264 NULL
265 };
266 static const char * const auto_n_preset_white_balance[] = {
267 "Manual",
268 "Auto",
269 "Incandescent",
270 "Fluorescent",
271 "Fluorescent H",
272 "Horizon",
273 "Daylight",
274 "Flash",
275 "Cloudy",
276 "Shade",
277 NULL,
278 };
279 static const char * const camera_iso_sensitivity_auto[] = {
280 "Manual",
281 "Auto",
282 NULL
283 };
284 static const char * const scene_mode[] = {
285 "None",
286 "Backlight",
287 "Beach/Snow",
288 "Candle Light",
289 "Dusk/Dawn",
290 "Fall Colors",
291 "Fireworks",
292 "Landscape",
293 "Night",
294 "Party/Indoor",
295 "Portrait",
296 "Sports",
297 "Sunset",
298 "Text",
299 NULL
300 };
301 static const char * const tune_emphasis[] = {
302 "None",
303 "50 Microseconds",
304 "75 Microseconds",
305 NULL,
306 };
307 static const char * const header_mode[] = {
308 "Separate Buffer",
309 "Joined With 1st Frame",
310 NULL,
311 };
312 static const char * const multi_slice[] = {
313 "Single",
314 "Max Macroblocks",
315 "Max Bytes",
316 NULL,
317 };
318 static const char * const entropy_mode[] = {
319 "CAVLC",
320 "CABAC",
321 NULL,
322 };
323 static const char * const mpeg_h264_level[] = {
324 "1",
325 "1b",
326 "1.1",
327 "1.2",
328 "1.3",
329 "2",
330 "2.1",
331 "2.2",
332 "3",
333 "3.1",
334 "3.2",
335 "4",
336 "4.1",
337 "4.2",
338 "5",
339 "5.1",
340 NULL,
341 };
342 static const char * const h264_loop_filter[] = {
343 "Enabled",
344 "Disabled",
345 "Disabled at Slice Boundary",
346 NULL,
347 };
348 static const char * const h264_profile[] = {
349 "Baseline",
350 "Constrained Baseline",
351 "Main",
352 "Extended",
353 "High",
354 "High 10",
355 "High 422",
356 "High 444 Predictive",
357 "High 10 Intra",
358 "High 422 Intra",
359 "High 444 Intra",
360 "CAVLC 444 Intra",
361 "Scalable Baseline",
362 "Scalable High",
363 "Scalable High Intra",
364 "Multiview High",
365 NULL,
366 };
367 static const char * const vui_sar_idc[] = {
368 "Unspecified",
369 "1:1",
370 "12:11",
371 "10:11",
372 "16:11",
373 "40:33",
374 "24:11",
375 "20:11",
376 "32:11",
377 "80:33",
378 "18:11",
379 "15:11",
380 "64:33",
381 "160:99",
382 "4:3",
383 "3:2",
384 "2:1",
385 "Extended SAR",
386 NULL,
387 };
388 static const char * const h264_fp_arrangement_type[] = {
389 "Checkerboard",
390 "Column",
391 "Row",
392 "Side by Side",
393 "Top Bottom",
394 "Temporal",
395 NULL,
396 };
397 static const char * const h264_fmo_map_type[] = {
398 "Interleaved Slices",
399 "Scattered Slices",
400 "Foreground with Leftover",
401 "Box Out",
402 "Raster Scan",
403 "Wipe Scan",
404 "Explicit",
405 NULL,
406 };
407 static const char * const mpeg_mpeg4_level[] = {
408 "0",
409 "0b",
410 "1",
411 "2",
412 "3",
413 "3b",
414 "4",
415 "5",
416 NULL,
417 };
418 static const char * const mpeg4_profile[] = {
419 "Simple",
420 "Advanced Simple",
421 "Core",
422 "Simple Scalable",
423 "Advanced Coding Efficiency",
424 NULL,
425 };
426
427 static const char * const vpx_golden_frame_sel[] = {
428 "Use Previous Frame",
429 "Use Previous Specific Frame",
430 NULL,
431 };
432
433 static const char * const flash_led_mode[] = {
434 "Off",
435 "Flash",
436 "Torch",
437 NULL,
438 };
439 static const char * const flash_strobe_source[] = {
440 "Software",
441 "External",
442 NULL,
443 };
444
445 static const char * const jpeg_chroma_subsampling[] = {
446 "4:4:4",
447 "4:2:2",
448 "4:2:0",
449 "4:1:1",
450 "4:1:0",
451 "Gray",
452 NULL,
453 };
454 static const char * const dv_tx_mode[] = {
455 "DVI-D",
456 "HDMI",
457 NULL,
458 };
459 static const char * const dv_rgb_range[] = {
460 "Automatic",
461 "RGB limited range (16-235)",
462 "RGB full range (0-255)",
463 NULL,
464 };
465 static const char * const detect_md_mode[] = {
466 "Disabled",
467 "Global",
468 "Threshold Grid",
469 "Region Grid",
470 NULL,
471 };
472
473
474 switch (id) {
475 case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ:
476 return mpeg_audio_sampling_freq;
477 case V4L2_CID_MPEG_AUDIO_ENCODING:
478 return mpeg_audio_encoding;
479 case V4L2_CID_MPEG_AUDIO_L1_BITRATE:
480 return mpeg_audio_l1_bitrate;
481 case V4L2_CID_MPEG_AUDIO_L2_BITRATE:
482 return mpeg_audio_l2_bitrate;
483 case V4L2_CID_MPEG_AUDIO_L3_BITRATE:
484 return mpeg_audio_l3_bitrate;
485 case V4L2_CID_MPEG_AUDIO_AC3_BITRATE:
486 return mpeg_audio_ac3_bitrate;
487 case V4L2_CID_MPEG_AUDIO_MODE:
488 return mpeg_audio_mode;
489 case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION:
490 return mpeg_audio_mode_extension;
491 case V4L2_CID_MPEG_AUDIO_EMPHASIS:
492 return mpeg_audio_emphasis;
493 case V4L2_CID_MPEG_AUDIO_CRC:
494 return mpeg_audio_crc;
495 case V4L2_CID_MPEG_AUDIO_DEC_PLAYBACK:
496 case V4L2_CID_MPEG_AUDIO_DEC_MULTILINGUAL_PLAYBACK:
497 return mpeg_audio_dec_playback;
498 case V4L2_CID_MPEG_VIDEO_ENCODING:
499 return mpeg_video_encoding;
500 case V4L2_CID_MPEG_VIDEO_ASPECT:
501 return mpeg_video_aspect;
502 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
503 return mpeg_video_bitrate_mode;
504 case V4L2_CID_MPEG_STREAM_TYPE:
505 return mpeg_stream_type;
506 case V4L2_CID_MPEG_STREAM_VBI_FMT:
507 return mpeg_stream_vbi_fmt;
508 case V4L2_CID_POWER_LINE_FREQUENCY:
509 return camera_power_line_frequency;
510 case V4L2_CID_EXPOSURE_AUTO:
511 return camera_exposure_auto;
512 case V4L2_CID_EXPOSURE_METERING:
513 return camera_exposure_metering;
514 case V4L2_CID_AUTO_FOCUS_RANGE:
515 return camera_auto_focus_range;
516 case V4L2_CID_COLORFX:
517 return colorfx;
518 case V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE:
519 return auto_n_preset_white_balance;
520 case V4L2_CID_ISO_SENSITIVITY_AUTO:
521 return camera_iso_sensitivity_auto;
522 case V4L2_CID_SCENE_MODE:
523 return scene_mode;
524 case V4L2_CID_TUNE_PREEMPHASIS:
525 return tune_emphasis;
526 case V4L2_CID_TUNE_DEEMPHASIS:
527 return tune_emphasis;
528 case V4L2_CID_FLASH_LED_MODE:
529 return flash_led_mode;
530 case V4L2_CID_FLASH_STROBE_SOURCE:
531 return flash_strobe_source;
532 case V4L2_CID_MPEG_VIDEO_HEADER_MODE:
533 return header_mode;
534 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE:
535 return multi_slice;
536 case V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE:
537 return entropy_mode;
538 case V4L2_CID_MPEG_VIDEO_H264_LEVEL:
539 return mpeg_h264_level;
540 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE:
541 return h264_loop_filter;
542 case V4L2_CID_MPEG_VIDEO_H264_PROFILE:
543 return h264_profile;
544 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC:
545 return vui_sar_idc;
546 case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE:
547 return h264_fp_arrangement_type;
548 case V4L2_CID_MPEG_VIDEO_H264_FMO_MAP_TYPE:
549 return h264_fmo_map_type;
550 case V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL:
551 return mpeg_mpeg4_level;
552 case V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE:
553 return mpeg4_profile;
554 case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_SEL:
555 return vpx_golden_frame_sel;
556 case V4L2_CID_JPEG_CHROMA_SUBSAMPLING:
557 return jpeg_chroma_subsampling;
558 case V4L2_CID_DV_TX_MODE:
559 return dv_tx_mode;
560 case V4L2_CID_DV_TX_RGB_RANGE:
561 case V4L2_CID_DV_RX_RGB_RANGE:
562 return dv_rgb_range;
563 case V4L2_CID_DETECT_MD_MODE:
564 return detect_md_mode;
565
566 default:
567 return NULL;
568 }
569 }
570 EXPORT_SYMBOL(v4l2_ctrl_get_menu);
571
572 #define __v4l2_qmenu_int_len(arr, len) ({ *(len) = ARRAY_SIZE(arr); arr; })
573 /*
574 * Returns NULL or an s64 type array containing the menu for given
575 * control ID. The total number of the menu items is returned in @len.
576 */
577 const s64 *v4l2_ctrl_get_int_menu(u32 id, u32 *len)
578 {
579 static const s64 qmenu_int_vpx_num_partitions[] = {
580 1, 2, 4, 8,
581 };
582
583 static const s64 qmenu_int_vpx_num_ref_frames[] = {
584 1, 2, 3,
585 };
586
587 switch (id) {
588 case V4L2_CID_MPEG_VIDEO_VPX_NUM_PARTITIONS:
589 return __v4l2_qmenu_int_len(qmenu_int_vpx_num_partitions, len);
590 case V4L2_CID_MPEG_VIDEO_VPX_NUM_REF_FRAMES:
591 return __v4l2_qmenu_int_len(qmenu_int_vpx_num_ref_frames, len);
592 default:
593 *len = 0;
594 return NULL;
595 }
596 }
597 EXPORT_SYMBOL(v4l2_ctrl_get_int_menu);
598
599 /* Return the control name. */
600 const char *v4l2_ctrl_get_name(u32 id)
601 {
602 switch (id) {
603 /* USER controls */
604 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
605 case V4L2_CID_USER_CLASS: return "User Controls";
606 case V4L2_CID_BRIGHTNESS: return "Brightness";
607 case V4L2_CID_CONTRAST: return "Contrast";
608 case V4L2_CID_SATURATION: return "Saturation";
609 case V4L2_CID_HUE: return "Hue";
610 case V4L2_CID_AUDIO_VOLUME: return "Volume";
611 case V4L2_CID_AUDIO_BALANCE: return "Balance";
612 case V4L2_CID_AUDIO_BASS: return "Bass";
613 case V4L2_CID_AUDIO_TREBLE: return "Treble";
614 case V4L2_CID_AUDIO_MUTE: return "Mute";
615 case V4L2_CID_AUDIO_LOUDNESS: return "Loudness";
616 case V4L2_CID_BLACK_LEVEL: return "Black Level";
617 case V4L2_CID_AUTO_WHITE_BALANCE: return "White Balance, Automatic";
618 case V4L2_CID_DO_WHITE_BALANCE: return "Do White Balance";
619 case V4L2_CID_RED_BALANCE: return "Red Balance";
620 case V4L2_CID_BLUE_BALANCE: return "Blue Balance";
621 case V4L2_CID_GAMMA: return "Gamma";
622 case V4L2_CID_EXPOSURE: return "Exposure";
623 case V4L2_CID_AUTOGAIN: return "Gain, Automatic";
624 case V4L2_CID_GAIN: return "Gain";
625 case V4L2_CID_HFLIP: return "Horizontal Flip";
626 case V4L2_CID_VFLIP: return "Vertical Flip";
627 case V4L2_CID_POWER_LINE_FREQUENCY: return "Power Line Frequency";
628 case V4L2_CID_HUE_AUTO: return "Hue, Automatic";
629 case V4L2_CID_WHITE_BALANCE_TEMPERATURE: return "White Balance Temperature";
630 case V4L2_CID_SHARPNESS: return "Sharpness";
631 case V4L2_CID_BACKLIGHT_COMPENSATION: return "Backlight Compensation";
632 case V4L2_CID_CHROMA_AGC: return "Chroma AGC";
633 case V4L2_CID_COLOR_KILLER: return "Color Killer";
634 case V4L2_CID_COLORFX: return "Color Effects";
635 case V4L2_CID_AUTOBRIGHTNESS: return "Brightness, Automatic";
636 case V4L2_CID_BAND_STOP_FILTER: return "Band-Stop Filter";
637 case V4L2_CID_ROTATE: return "Rotate";
638 case V4L2_CID_BG_COLOR: return "Background Color";
639 case V4L2_CID_CHROMA_GAIN: return "Chroma Gain";
640 case V4L2_CID_ILLUMINATORS_1: return "Illuminator 1";
641 case V4L2_CID_ILLUMINATORS_2: return "Illuminator 2";
642 case V4L2_CID_MIN_BUFFERS_FOR_CAPTURE: return "Min Number of Capture Buffers";
643 case V4L2_CID_MIN_BUFFERS_FOR_OUTPUT: return "Min Number of Output Buffers";
644 case V4L2_CID_ALPHA_COMPONENT: return "Alpha Component";
645 case V4L2_CID_COLORFX_CBCR: return "Color Effects, CbCr";
646
647 /* Codec controls */
648 /* The MPEG controls are applicable to all codec controls
649 * and the 'MPEG' part of the define is historical */
650 /* Keep the order of the 'case's the same as in videodev2.h! */
651 case V4L2_CID_MPEG_CLASS: return "Codec Controls";
652 case V4L2_CID_MPEG_STREAM_TYPE: return "Stream Type";
653 case V4L2_CID_MPEG_STREAM_PID_PMT: return "Stream PMT Program ID";
654 case V4L2_CID_MPEG_STREAM_PID_AUDIO: return "Stream Audio Program ID";
655 case V4L2_CID_MPEG_STREAM_PID_VIDEO: return "Stream Video Program ID";
656 case V4L2_CID_MPEG_STREAM_PID_PCR: return "Stream PCR Program ID";
657 case V4L2_CID_MPEG_STREAM_PES_ID_AUDIO: return "Stream PES Audio ID";
658 case V4L2_CID_MPEG_STREAM_PES_ID_VIDEO: return "Stream PES Video ID";
659 case V4L2_CID_MPEG_STREAM_VBI_FMT: return "Stream VBI Format";
660 case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ: return "Audio Sampling Frequency";
661 case V4L2_CID_MPEG_AUDIO_ENCODING: return "Audio Encoding";
662 case V4L2_CID_MPEG_AUDIO_L1_BITRATE: return "Audio Layer I Bitrate";
663 case V4L2_CID_MPEG_AUDIO_L2_BITRATE: return "Audio Layer II Bitrate";
664 case V4L2_CID_MPEG_AUDIO_L3_BITRATE: return "Audio Layer III Bitrate";
665 case V4L2_CID_MPEG_AUDIO_MODE: return "Audio Stereo Mode";
666 case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION: return "Audio Stereo Mode Extension";
667 case V4L2_CID_MPEG_AUDIO_EMPHASIS: return "Audio Emphasis";
668 case V4L2_CID_MPEG_AUDIO_CRC: return "Audio CRC";
669 case V4L2_CID_MPEG_AUDIO_MUTE: return "Audio Mute";
670 case V4L2_CID_MPEG_AUDIO_AAC_BITRATE: return "Audio AAC Bitrate";
671 case V4L2_CID_MPEG_AUDIO_AC3_BITRATE: return "Audio AC-3 Bitrate";
672 case V4L2_CID_MPEG_AUDIO_DEC_PLAYBACK: return "Audio Playback";
673 case V4L2_CID_MPEG_AUDIO_DEC_MULTILINGUAL_PLAYBACK: return "Audio Multilingual Playback";
674 case V4L2_CID_MPEG_VIDEO_ENCODING: return "Video Encoding";
675 case V4L2_CID_MPEG_VIDEO_ASPECT: return "Video Aspect";
676 case V4L2_CID_MPEG_VIDEO_B_FRAMES: return "Video B Frames";
677 case V4L2_CID_MPEG_VIDEO_GOP_SIZE: return "Video GOP Size";
678 case V4L2_CID_MPEG_VIDEO_GOP_CLOSURE: return "Video GOP Closure";
679 case V4L2_CID_MPEG_VIDEO_PULLDOWN: return "Video Pulldown";
680 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE: return "Video Bitrate Mode";
681 case V4L2_CID_MPEG_VIDEO_BITRATE: return "Video Bitrate";
682 case V4L2_CID_MPEG_VIDEO_BITRATE_PEAK: return "Video Peak Bitrate";
683 case V4L2_CID_MPEG_VIDEO_TEMPORAL_DECIMATION: return "Video Temporal Decimation";
684 case V4L2_CID_MPEG_VIDEO_MUTE: return "Video Mute";
685 case V4L2_CID_MPEG_VIDEO_MUTE_YUV: return "Video Mute YUV";
686 case V4L2_CID_MPEG_VIDEO_DECODER_SLICE_INTERFACE: return "Decoder Slice Interface";
687 case V4L2_CID_MPEG_VIDEO_DECODER_MPEG4_DEBLOCK_FILTER: return "MPEG4 Loop Filter Enable";
688 case V4L2_CID_MPEG_VIDEO_CYCLIC_INTRA_REFRESH_MB: return "Number of Intra Refresh MBs";
689 case V4L2_CID_MPEG_VIDEO_FRAME_RC_ENABLE: return "Frame Level Rate Control Enable";
690 case V4L2_CID_MPEG_VIDEO_MB_RC_ENABLE: return "H264 MB Level Rate Control";
691 case V4L2_CID_MPEG_VIDEO_HEADER_MODE: return "Sequence Header Mode";
692 case V4L2_CID_MPEG_VIDEO_MAX_REF_PIC: return "Max Number of Reference Pics";
693 case V4L2_CID_MPEG_VIDEO_H263_I_FRAME_QP: return "H263 I-Frame QP Value";
694 case V4L2_CID_MPEG_VIDEO_H263_P_FRAME_QP: return "H263 P-Frame QP Value";
695 case V4L2_CID_MPEG_VIDEO_H263_B_FRAME_QP: return "H263 B-Frame QP Value";
696 case V4L2_CID_MPEG_VIDEO_H263_MIN_QP: return "H263 Minimum QP Value";
697 case V4L2_CID_MPEG_VIDEO_H263_MAX_QP: return "H263 Maximum QP Value";
698 case V4L2_CID_MPEG_VIDEO_H264_I_FRAME_QP: return "H264 I-Frame QP Value";
699 case V4L2_CID_MPEG_VIDEO_H264_P_FRAME_QP: return "H264 P-Frame QP Value";
700 case V4L2_CID_MPEG_VIDEO_H264_B_FRAME_QP: return "H264 B-Frame QP Value";
701 case V4L2_CID_MPEG_VIDEO_H264_MAX_QP: return "H264 Maximum QP Value";
702 case V4L2_CID_MPEG_VIDEO_H264_MIN_QP: return "H264 Minimum QP Value";
703 case V4L2_CID_MPEG_VIDEO_H264_8X8_TRANSFORM: return "H264 8x8 Transform Enable";
704 case V4L2_CID_MPEG_VIDEO_H264_CPB_SIZE: return "H264 CPB Buffer Size";
705 case V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE: return "H264 Entropy Mode";
706 case V4L2_CID_MPEG_VIDEO_H264_I_PERIOD: return "H264 I-Frame Period";
707 case V4L2_CID_MPEG_VIDEO_H264_LEVEL: return "H264 Level";
708 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_ALPHA: return "H264 Loop Filter Alpha Offset";
709 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_BETA: return "H264 Loop Filter Beta Offset";
710 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE: return "H264 Loop Filter Mode";
711 case V4L2_CID_MPEG_VIDEO_H264_PROFILE: return "H264 Profile";
712 case V4L2_CID_MPEG_VIDEO_H264_VUI_EXT_SAR_HEIGHT: return "Vertical Size of SAR";
713 case V4L2_CID_MPEG_VIDEO_H264_VUI_EXT_SAR_WIDTH: return "Horizontal Size of SAR";
714 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_ENABLE: return "Aspect Ratio VUI Enable";
715 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC: return "VUI Aspect Ratio IDC";
716 case V4L2_CID_MPEG_VIDEO_H264_SEI_FRAME_PACKING: return "H264 Enable Frame Packing SEI";
717 case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_CURRENT_FRAME_0: return "H264 Set Curr. Frame as Frame0";
718 case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE: return "H264 FP Arrangement Type";
719 case V4L2_CID_MPEG_VIDEO_H264_FMO: return "H264 Flexible MB Ordering";
720 case V4L2_CID_MPEG_VIDEO_H264_FMO_MAP_TYPE: return "H264 Map Type for FMO";
721 case V4L2_CID_MPEG_VIDEO_H264_FMO_SLICE_GROUP: return "H264 FMO Number of Slice Groups";
722 case V4L2_CID_MPEG_VIDEO_H264_FMO_CHANGE_DIRECTION: return "H264 FMO Direction of Change";
723 case V4L2_CID_MPEG_VIDEO_H264_FMO_CHANGE_RATE: return "H264 FMO Size of 1st Slice Grp";
724 case V4L2_CID_MPEG_VIDEO_H264_FMO_RUN_LENGTH: return "H264 FMO No. of Consecutive MBs";
725 case V4L2_CID_MPEG_VIDEO_H264_ASO: return "H264 Arbitrary Slice Ordering";
726 case V4L2_CID_MPEG_VIDEO_H264_ASO_SLICE_ORDER: return "H264 ASO Slice Order";
727 case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING: return "Enable H264 Hierarchical Coding";
728 case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_TYPE: return "H264 Hierarchical Coding Type";
729 case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_LAYER:return "H264 Number of HC Layers";
730 case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_LAYER_QP:
731 return "H264 Set QP Value for HC Layers";
732 case V4L2_CID_MPEG_VIDEO_MPEG4_I_FRAME_QP: return "MPEG4 I-Frame QP Value";
733 case V4L2_CID_MPEG_VIDEO_MPEG4_P_FRAME_QP: return "MPEG4 P-Frame QP Value";
734 case V4L2_CID_MPEG_VIDEO_MPEG4_B_FRAME_QP: return "MPEG4 B-Frame QP Value";
735 case V4L2_CID_MPEG_VIDEO_MPEG4_MIN_QP: return "MPEG4 Minimum QP Value";
736 case V4L2_CID_MPEG_VIDEO_MPEG4_MAX_QP: return "MPEG4 Maximum QP Value";
737 case V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL: return "MPEG4 Level";
738 case V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE: return "MPEG4 Profile";
739 case V4L2_CID_MPEG_VIDEO_MPEG4_QPEL: return "Quarter Pixel Search Enable";
740 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MAX_BYTES: return "Maximum Bytes in a Slice";
741 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MAX_MB: return "Number of MBs in a Slice";
742 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE: return "Slice Partitioning Method";
743 case V4L2_CID_MPEG_VIDEO_VBV_SIZE: return "VBV Buffer Size";
744 case V4L2_CID_MPEG_VIDEO_DEC_PTS: return "Video Decoder PTS";
745 case V4L2_CID_MPEG_VIDEO_DEC_FRAME: return "Video Decoder Frame Count";
746 case V4L2_CID_MPEG_VIDEO_VBV_DELAY: return "Initial Delay for VBV Control";
747 case V4L2_CID_MPEG_VIDEO_MV_H_SEARCH_RANGE: return "Horizontal MV Search Range";
748 case V4L2_CID_MPEG_VIDEO_MV_V_SEARCH_RANGE: return "Vertical MV Search Range";
749 case V4L2_CID_MPEG_VIDEO_REPEAT_SEQ_HEADER: return "Repeat Sequence Header";
750
751 /* VPX controls */
752 case V4L2_CID_MPEG_VIDEO_VPX_NUM_PARTITIONS: return "VPX Number of Partitions";
753 case V4L2_CID_MPEG_VIDEO_VPX_IMD_DISABLE_4X4: return "VPX Intra Mode Decision Disable";
754 case V4L2_CID_MPEG_VIDEO_VPX_NUM_REF_FRAMES: return "VPX No. of Refs for P Frame";
755 case V4L2_CID_MPEG_VIDEO_VPX_FILTER_LEVEL: return "VPX Loop Filter Level Range";
756 case V4L2_CID_MPEG_VIDEO_VPX_FILTER_SHARPNESS: return "VPX Deblocking Effect Control";
757 case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_REF_PERIOD: return "VPX Golden Frame Refresh Period";
758 case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_SEL: return "VPX Golden Frame Indicator";
759 case V4L2_CID_MPEG_VIDEO_VPX_MIN_QP: return "VPX Minimum QP Value";
760 case V4L2_CID_MPEG_VIDEO_VPX_MAX_QP: return "VPX Maximum QP Value";
761 case V4L2_CID_MPEG_VIDEO_VPX_I_FRAME_QP: return "VPX I-Frame QP Value";
762 case V4L2_CID_MPEG_VIDEO_VPX_P_FRAME_QP: return "VPX P-Frame QP Value";
763 case V4L2_CID_MPEG_VIDEO_VPX_PROFILE: return "VPX Profile";
764
765 /* CAMERA controls */
766 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
767 case V4L2_CID_CAMERA_CLASS: return "Camera Controls";
768 case V4L2_CID_EXPOSURE_AUTO: return "Auto Exposure";
769 case V4L2_CID_EXPOSURE_ABSOLUTE: return "Exposure Time, Absolute";
770 case V4L2_CID_EXPOSURE_AUTO_PRIORITY: return "Exposure, Dynamic Framerate";
771 case V4L2_CID_PAN_RELATIVE: return "Pan, Relative";
772 case V4L2_CID_TILT_RELATIVE: return "Tilt, Relative";
773 case V4L2_CID_PAN_RESET: return "Pan, Reset";
774 case V4L2_CID_TILT_RESET: return "Tilt, Reset";
775 case V4L2_CID_PAN_ABSOLUTE: return "Pan, Absolute";
776 case V4L2_CID_TILT_ABSOLUTE: return "Tilt, Absolute";
777 case V4L2_CID_FOCUS_ABSOLUTE: return "Focus, Absolute";
778 case V4L2_CID_FOCUS_RELATIVE: return "Focus, Relative";
779 case V4L2_CID_FOCUS_AUTO: return "Focus, Automatic Continuous";
780 case V4L2_CID_ZOOM_ABSOLUTE: return "Zoom, Absolute";
781 case V4L2_CID_ZOOM_RELATIVE: return "Zoom, Relative";
782 case V4L2_CID_ZOOM_CONTINUOUS: return "Zoom, Continuous";
783 case V4L2_CID_PRIVACY: return "Privacy";
784 case V4L2_CID_IRIS_ABSOLUTE: return "Iris, Absolute";
785 case V4L2_CID_IRIS_RELATIVE: return "Iris, Relative";
786 case V4L2_CID_AUTO_EXPOSURE_BIAS: return "Auto Exposure, Bias";
787 case V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE: return "White Balance, Auto & Preset";
788 case V4L2_CID_WIDE_DYNAMIC_RANGE: return "Wide Dynamic Range";
789 case V4L2_CID_IMAGE_STABILIZATION: return "Image Stabilization";
790 case V4L2_CID_ISO_SENSITIVITY: return "ISO Sensitivity";
791 case V4L2_CID_ISO_SENSITIVITY_AUTO: return "ISO Sensitivity, Auto";
792 case V4L2_CID_EXPOSURE_METERING: return "Exposure, Metering Mode";
793 case V4L2_CID_SCENE_MODE: return "Scene Mode";
794 case V4L2_CID_3A_LOCK: return "3A Lock";
795 case V4L2_CID_AUTO_FOCUS_START: return "Auto Focus, Start";
796 case V4L2_CID_AUTO_FOCUS_STOP: return "Auto Focus, Stop";
797 case V4L2_CID_AUTO_FOCUS_STATUS: return "Auto Focus, Status";
798 case V4L2_CID_AUTO_FOCUS_RANGE: return "Auto Focus, Range";
799 case V4L2_CID_PAN_SPEED: return "Pan, Speed";
800 case V4L2_CID_TILT_SPEED: return "Tilt, Speed";
801
802 /* FM Radio Modulator controls */
803 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
804 case V4L2_CID_FM_TX_CLASS: return "FM Radio Modulator Controls";
805 case V4L2_CID_RDS_TX_DEVIATION: return "RDS Signal Deviation";
806 case V4L2_CID_RDS_TX_PI: return "RDS Program ID";
807 case V4L2_CID_RDS_TX_PTY: return "RDS Program Type";
808 case V4L2_CID_RDS_TX_PS_NAME: return "RDS PS Name";
809 case V4L2_CID_RDS_TX_RADIO_TEXT: return "RDS Radio Text";
810 case V4L2_CID_RDS_TX_MONO_STEREO: return "RDS Stereo";
811 case V4L2_CID_RDS_TX_ARTIFICIAL_HEAD: return "RDS Artificial Head";
812 case V4L2_CID_RDS_TX_COMPRESSED: return "RDS Compressed";
813 case V4L2_CID_RDS_TX_DYNAMIC_PTY: return "RDS Dynamic PTY";
814 case V4L2_CID_RDS_TX_TRAFFIC_ANNOUNCEMENT: return "RDS Traffic Announcement";
815 case V4L2_CID_RDS_TX_TRAFFIC_PROGRAM: return "RDS Traffic Program";
816 case V4L2_CID_RDS_TX_MUSIC_SPEECH: return "RDS Music";
817 case V4L2_CID_RDS_TX_ALT_FREQS_ENABLE: return "RDS Enable Alt Frequencies";
818 case V4L2_CID_RDS_TX_ALT_FREQS: return "RDS Alternate Frequencies";
819 case V4L2_CID_AUDIO_LIMITER_ENABLED: return "Audio Limiter Feature Enabled";
820 case V4L2_CID_AUDIO_LIMITER_RELEASE_TIME: return "Audio Limiter Release Time";
821 case V4L2_CID_AUDIO_LIMITER_DEVIATION: return "Audio Limiter Deviation";
822 case V4L2_CID_AUDIO_COMPRESSION_ENABLED: return "Audio Compression Enabled";
823 case V4L2_CID_AUDIO_COMPRESSION_GAIN: return "Audio Compression Gain";
824 case V4L2_CID_AUDIO_COMPRESSION_THRESHOLD: return "Audio Compression Threshold";
825 case V4L2_CID_AUDIO_COMPRESSION_ATTACK_TIME: return "Audio Compression Attack Time";
826 case V4L2_CID_AUDIO_COMPRESSION_RELEASE_TIME: return "Audio Compression Release Time";
827 case V4L2_CID_PILOT_TONE_ENABLED: return "Pilot Tone Feature Enabled";
828 case V4L2_CID_PILOT_TONE_DEVIATION: return "Pilot Tone Deviation";
829 case V4L2_CID_PILOT_TONE_FREQUENCY: return "Pilot Tone Frequency";
830 case V4L2_CID_TUNE_PREEMPHASIS: return "Pre-Emphasis";
831 case V4L2_CID_TUNE_POWER_LEVEL: return "Tune Power Level";
832 case V4L2_CID_TUNE_ANTENNA_CAPACITOR: return "Tune Antenna Capacitor";
833
834 /* Flash controls */
835 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
836 case V4L2_CID_FLASH_CLASS: return "Flash Controls";
837 case V4L2_CID_FLASH_LED_MODE: return "LED Mode";
838 case V4L2_CID_FLASH_STROBE_SOURCE: return "Strobe Source";
839 case V4L2_CID_FLASH_STROBE: return "Strobe";
840 case V4L2_CID_FLASH_STROBE_STOP: return "Stop Strobe";
841 case V4L2_CID_FLASH_STROBE_STATUS: return "Strobe Status";
842 case V4L2_CID_FLASH_TIMEOUT: return "Strobe Timeout";
843 case V4L2_CID_FLASH_INTENSITY: return "Intensity, Flash Mode";
844 case V4L2_CID_FLASH_TORCH_INTENSITY: return "Intensity, Torch Mode";
845 case V4L2_CID_FLASH_INDICATOR_INTENSITY: return "Intensity, Indicator";
846 case V4L2_CID_FLASH_FAULT: return "Faults";
847 case V4L2_CID_FLASH_CHARGE: return "Charge";
848 case V4L2_CID_FLASH_READY: return "Ready to Strobe";
849
850 /* JPEG encoder controls */
851 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
852 case V4L2_CID_JPEG_CLASS: return "JPEG Compression Controls";
853 case V4L2_CID_JPEG_CHROMA_SUBSAMPLING: return "Chroma Subsampling";
854 case V4L2_CID_JPEG_RESTART_INTERVAL: return "Restart Interval";
855 case V4L2_CID_JPEG_COMPRESSION_QUALITY: return "Compression Quality";
856 case V4L2_CID_JPEG_ACTIVE_MARKER: return "Active Markers";
857
858 /* Image source controls */
859 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
860 case V4L2_CID_IMAGE_SOURCE_CLASS: return "Image Source Controls";
861 case V4L2_CID_VBLANK: return "Vertical Blanking";
862 case V4L2_CID_HBLANK: return "Horizontal Blanking";
863 case V4L2_CID_ANALOGUE_GAIN: return "Analogue Gain";
864 case V4L2_CID_TEST_PATTERN_RED: return "Red Pixel Value";
865 case V4L2_CID_TEST_PATTERN_GREENR: return "Green (Red) Pixel Value";
866 case V4L2_CID_TEST_PATTERN_BLUE: return "Blue Pixel Value";
867 case V4L2_CID_TEST_PATTERN_GREENB: return "Green (Blue) Pixel Value";
868
869 /* Image processing controls */
870 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
871 case V4L2_CID_IMAGE_PROC_CLASS: return "Image Processing Controls";
872 case V4L2_CID_LINK_FREQ: return "Link Frequency";
873 case V4L2_CID_PIXEL_RATE: return "Pixel Rate";
874 case V4L2_CID_TEST_PATTERN: return "Test Pattern";
875
876 /* DV controls */
877 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
878 case V4L2_CID_DV_CLASS: return "Digital Video Controls";
879 case V4L2_CID_DV_TX_HOTPLUG: return "Hotplug Present";
880 case V4L2_CID_DV_TX_RXSENSE: return "RxSense Present";
881 case V4L2_CID_DV_TX_EDID_PRESENT: return "EDID Present";
882 case V4L2_CID_DV_TX_MODE: return "Transmit Mode";
883 case V4L2_CID_DV_TX_RGB_RANGE: return "Tx RGB Quantization Range";
884 case V4L2_CID_DV_RX_POWER_PRESENT: return "Power Present";
885 case V4L2_CID_DV_RX_RGB_RANGE: return "Rx RGB Quantization Range";
886
887 case V4L2_CID_FM_RX_CLASS: return "FM Radio Receiver Controls";
888 case V4L2_CID_TUNE_DEEMPHASIS: return "De-Emphasis";
889 case V4L2_CID_RDS_RECEPTION: return "RDS Reception";
890 case V4L2_CID_RF_TUNER_CLASS: return "RF Tuner Controls";
891 case V4L2_CID_RF_TUNER_RF_GAIN: return "RF Gain";
892 case V4L2_CID_RF_TUNER_LNA_GAIN_AUTO: return "LNA Gain, Auto";
893 case V4L2_CID_RF_TUNER_LNA_GAIN: return "LNA Gain";
894 case V4L2_CID_RF_TUNER_MIXER_GAIN_AUTO: return "Mixer Gain, Auto";
895 case V4L2_CID_RF_TUNER_MIXER_GAIN: return "Mixer Gain";
896 case V4L2_CID_RF_TUNER_IF_GAIN_AUTO: return "IF Gain, Auto";
897 case V4L2_CID_RF_TUNER_IF_GAIN: return "IF Gain";
898 case V4L2_CID_RF_TUNER_BANDWIDTH_AUTO: return "Bandwidth, Auto";
899 case V4L2_CID_RF_TUNER_BANDWIDTH: return "Bandwidth";
900 case V4L2_CID_RF_TUNER_PLL_LOCK: return "PLL Lock";
901 case V4L2_CID_RDS_RX_PTY: return "RDS Program Type";
902 case V4L2_CID_RDS_RX_PS_NAME: return "RDS PS Name";
903 case V4L2_CID_RDS_RX_RADIO_TEXT: return "RDS Radio Text";
904 case V4L2_CID_RDS_RX_TRAFFIC_ANNOUNCEMENT: return "RDS Traffic Announcement";
905 case V4L2_CID_RDS_RX_TRAFFIC_PROGRAM: return "RDS Traffic Program";
906 case V4L2_CID_RDS_RX_MUSIC_SPEECH: return "RDS Music";
907
908 /* Detection controls */
909 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
910 case V4L2_CID_DETECT_CLASS: return "Detection Controls";
911 case V4L2_CID_DETECT_MD_MODE: return "Motion Detection Mode";
912 case V4L2_CID_DETECT_MD_GLOBAL_THRESHOLD: return "MD Global Threshold";
913 case V4L2_CID_DETECT_MD_THRESHOLD_GRID: return "MD Threshold Grid";
914 case V4L2_CID_DETECT_MD_REGION_GRID: return "MD Region Grid";
915 default:
916 return NULL;
917 }
918 }
919 EXPORT_SYMBOL(v4l2_ctrl_get_name);
920
921 void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type,
922 s64 *min, s64 *max, u64 *step, s64 *def, u32 *flags)
923 {
924 *name = v4l2_ctrl_get_name(id);
925 *flags = 0;
926
927 switch (id) {
928 case V4L2_CID_AUDIO_MUTE:
929 case V4L2_CID_AUDIO_LOUDNESS:
930 case V4L2_CID_AUTO_WHITE_BALANCE:
931 case V4L2_CID_AUTOGAIN:
932 case V4L2_CID_HFLIP:
933 case V4L2_CID_VFLIP:
934 case V4L2_CID_HUE_AUTO:
935 case V4L2_CID_CHROMA_AGC:
936 case V4L2_CID_COLOR_KILLER:
937 case V4L2_CID_AUTOBRIGHTNESS:
938 case V4L2_CID_MPEG_AUDIO_MUTE:
939 case V4L2_CID_MPEG_VIDEO_MUTE:
940 case V4L2_CID_MPEG_VIDEO_GOP_CLOSURE:
941 case V4L2_CID_MPEG_VIDEO_PULLDOWN:
942 case V4L2_CID_EXPOSURE_AUTO_PRIORITY:
943 case V4L2_CID_FOCUS_AUTO:
944 case V4L2_CID_PRIVACY:
945 case V4L2_CID_AUDIO_LIMITER_ENABLED:
946 case V4L2_CID_AUDIO_COMPRESSION_ENABLED:
947 case V4L2_CID_PILOT_TONE_ENABLED:
948 case V4L2_CID_ILLUMINATORS_1:
949 case V4L2_CID_ILLUMINATORS_2:
950 case V4L2_CID_FLASH_STROBE_STATUS:
951 case V4L2_CID_FLASH_CHARGE:
952 case V4L2_CID_FLASH_READY:
953 case V4L2_CID_MPEG_VIDEO_DECODER_MPEG4_DEBLOCK_FILTER:
954 case V4L2_CID_MPEG_VIDEO_DECODER_SLICE_INTERFACE:
955 case V4L2_CID_MPEG_VIDEO_FRAME_RC_ENABLE:
956 case V4L2_CID_MPEG_VIDEO_MB_RC_ENABLE:
957 case V4L2_CID_MPEG_VIDEO_H264_8X8_TRANSFORM:
958 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_ENABLE:
959 case V4L2_CID_MPEG_VIDEO_MPEG4_QPEL:
960 case V4L2_CID_MPEG_VIDEO_REPEAT_SEQ_HEADER:
961 case V4L2_CID_WIDE_DYNAMIC_RANGE:
962 case V4L2_CID_IMAGE_STABILIZATION:
963 case V4L2_CID_RDS_RECEPTION:
964 case V4L2_CID_RF_TUNER_LNA_GAIN_AUTO:
965 case V4L2_CID_RF_TUNER_MIXER_GAIN_AUTO:
966 case V4L2_CID_RF_TUNER_IF_GAIN_AUTO:
967 case V4L2_CID_RF_TUNER_BANDWIDTH_AUTO:
968 case V4L2_CID_RF_TUNER_PLL_LOCK:
969 case V4L2_CID_RDS_TX_MONO_STEREO:
970 case V4L2_CID_RDS_TX_ARTIFICIAL_HEAD:
971 case V4L2_CID_RDS_TX_COMPRESSED:
972 case V4L2_CID_RDS_TX_DYNAMIC_PTY:
973 case V4L2_CID_RDS_TX_TRAFFIC_ANNOUNCEMENT:
974 case V4L2_CID_RDS_TX_TRAFFIC_PROGRAM:
975 case V4L2_CID_RDS_TX_MUSIC_SPEECH:
976 case V4L2_CID_RDS_TX_ALT_FREQS_ENABLE:
977 case V4L2_CID_RDS_RX_TRAFFIC_ANNOUNCEMENT:
978 case V4L2_CID_RDS_RX_TRAFFIC_PROGRAM:
979 case V4L2_CID_RDS_RX_MUSIC_SPEECH:
980 *type = V4L2_CTRL_TYPE_BOOLEAN;
981 *min = 0;
982 *max = *step = 1;
983 break;
984 case V4L2_CID_MPEG_VIDEO_MV_H_SEARCH_RANGE:
985 case V4L2_CID_MPEG_VIDEO_MV_V_SEARCH_RANGE:
986 *type = V4L2_CTRL_TYPE_INTEGER;
987 break;
988 case V4L2_CID_PAN_RESET:
989 case V4L2_CID_TILT_RESET:
990 case V4L2_CID_FLASH_STROBE:
991 case V4L2_CID_FLASH_STROBE_STOP:
992 case V4L2_CID_AUTO_FOCUS_START:
993 case V4L2_CID_AUTO_FOCUS_STOP:
994 *type = V4L2_CTRL_TYPE_BUTTON;
995 *flags |= V4L2_CTRL_FLAG_WRITE_ONLY |
996 V4L2_CTRL_FLAG_EXECUTE_ON_WRITE;
997 *min = *max = *step = *def = 0;
998 break;
999 case V4L2_CID_POWER_LINE_FREQUENCY:
1000 case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ:
1001 case V4L2_CID_MPEG_AUDIO_ENCODING:
1002 case V4L2_CID_MPEG_AUDIO_L1_BITRATE:
1003 case V4L2_CID_MPEG_AUDIO_L2_BITRATE:
1004 case V4L2_CID_MPEG_AUDIO_L3_BITRATE:
1005 case V4L2_CID_MPEG_AUDIO_AC3_BITRATE:
1006 case V4L2_CID_MPEG_AUDIO_MODE:
1007 case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION:
1008 case V4L2_CID_MPEG_AUDIO_EMPHASIS:
1009 case V4L2_CID_MPEG_AUDIO_CRC:
1010 case V4L2_CID_MPEG_AUDIO_DEC_PLAYBACK:
1011 case V4L2_CID_MPEG_AUDIO_DEC_MULTILINGUAL_PLAYBACK:
1012 case V4L2_CID_MPEG_VIDEO_ENCODING:
1013 case V4L2_CID_MPEG_VIDEO_ASPECT:
1014 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
1015 case V4L2_CID_MPEG_STREAM_TYPE:
1016 case V4L2_CID_MPEG_STREAM_VBI_FMT:
1017 case V4L2_CID_EXPOSURE_AUTO:
1018 case V4L2_CID_AUTO_FOCUS_RANGE:
1019 case V4L2_CID_COLORFX:
1020 case V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE:
1021 case V4L2_CID_TUNE_PREEMPHASIS:
1022 case V4L2_CID_FLASH_LED_MODE:
1023 case V4L2_CID_FLASH_STROBE_SOURCE:
1024 case V4L2_CID_MPEG_VIDEO_HEADER_MODE:
1025 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE:
1026 case V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE:
1027 case V4L2_CID_MPEG_VIDEO_H264_LEVEL:
1028 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE:
1029 case V4L2_CID_MPEG_VIDEO_H264_PROFILE:
1030 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC:
1031 case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE:
1032 case V4L2_CID_MPEG_VIDEO_H264_FMO_MAP_TYPE:
1033 case V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL:
1034 case V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE:
1035 case V4L2_CID_JPEG_CHROMA_SUBSAMPLING:
1036 case V4L2_CID_ISO_SENSITIVITY_AUTO:
1037 case V4L2_CID_EXPOSURE_METERING:
1038 case V4L2_CID_SCENE_MODE:
1039 case V4L2_CID_DV_TX_MODE:
1040 case V4L2_CID_DV_TX_RGB_RANGE:
1041 case V4L2_CID_DV_RX_RGB_RANGE:
1042 case V4L2_CID_TEST_PATTERN:
1043 case V4L2_CID_TUNE_DEEMPHASIS:
1044 case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_SEL:
1045 case V4L2_CID_DETECT_MD_MODE:
1046 *type = V4L2_CTRL_TYPE_MENU;
1047 break;
1048 case V4L2_CID_LINK_FREQ:
1049 *type = V4L2_CTRL_TYPE_INTEGER_MENU;
1050 break;
1051 case V4L2_CID_RDS_TX_PS_NAME:
1052 case V4L2_CID_RDS_TX_RADIO_TEXT:
1053 case V4L2_CID_RDS_RX_PS_NAME:
1054 case V4L2_CID_RDS_RX_RADIO_TEXT:
1055 *type = V4L2_CTRL_TYPE_STRING;
1056 break;
1057 case V4L2_CID_ISO_SENSITIVITY:
1058 case V4L2_CID_AUTO_EXPOSURE_BIAS:
1059 case V4L2_CID_MPEG_VIDEO_VPX_NUM_PARTITIONS:
1060 case V4L2_CID_MPEG_VIDEO_VPX_NUM_REF_FRAMES:
1061 *type = V4L2_CTRL_TYPE_INTEGER_MENU;
1062 break;
1063 case V4L2_CID_USER_CLASS:
1064 case V4L2_CID_CAMERA_CLASS:
1065 case V4L2_CID_MPEG_CLASS:
1066 case V4L2_CID_FM_TX_CLASS:
1067 case V4L2_CID_FLASH_CLASS:
1068 case V4L2_CID_JPEG_CLASS:
1069 case V4L2_CID_IMAGE_SOURCE_CLASS:
1070 case V4L2_CID_IMAGE_PROC_CLASS:
1071 case V4L2_CID_DV_CLASS:
1072 case V4L2_CID_FM_RX_CLASS:
1073 case V4L2_CID_RF_TUNER_CLASS:
1074 case V4L2_CID_DETECT_CLASS:
1075 *type = V4L2_CTRL_TYPE_CTRL_CLASS;
1076 /* You can neither read not write these */
1077 *flags |= V4L2_CTRL_FLAG_READ_ONLY | V4L2_CTRL_FLAG_WRITE_ONLY;
1078 *min = *max = *step = *def = 0;
1079 break;
1080 case V4L2_CID_BG_COLOR:
1081 *type = V4L2_CTRL_TYPE_INTEGER;
1082 *step = 1;
1083 *min = 0;
1084 /* Max is calculated as RGB888 that is 2^24 */
1085 *max = 0xFFFFFF;
1086 break;
1087 case V4L2_CID_FLASH_FAULT:
1088 case V4L2_CID_JPEG_ACTIVE_MARKER:
1089 case V4L2_CID_3A_LOCK:
1090 case V4L2_CID_AUTO_FOCUS_STATUS:
1091 case V4L2_CID_DV_TX_HOTPLUG:
1092 case V4L2_CID_DV_TX_RXSENSE:
1093 case V4L2_CID_DV_TX_EDID_PRESENT:
1094 case V4L2_CID_DV_RX_POWER_PRESENT:
1095 *type = V4L2_CTRL_TYPE_BITMASK;
1096 break;
1097 case V4L2_CID_MIN_BUFFERS_FOR_CAPTURE:
1098 case V4L2_CID_MIN_BUFFERS_FOR_OUTPUT:
1099 *type = V4L2_CTRL_TYPE_INTEGER;
1100 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
1101 break;
1102 case V4L2_CID_MPEG_VIDEO_DEC_PTS:
1103 *type = V4L2_CTRL_TYPE_INTEGER64;
1104 *flags |= V4L2_CTRL_FLAG_VOLATILE | V4L2_CTRL_FLAG_READ_ONLY;
1105 *min = *def = 0;
1106 *max = 0x1ffffffffLL;
1107 *step = 1;
1108 break;
1109 case V4L2_CID_MPEG_VIDEO_DEC_FRAME:
1110 *type = V4L2_CTRL_TYPE_INTEGER64;
1111 *flags |= V4L2_CTRL_FLAG_VOLATILE | V4L2_CTRL_FLAG_READ_ONLY;
1112 *min = *def = 0;
1113 *max = 0x7fffffffffffffffLL;
1114 *step = 1;
1115 break;
1116 case V4L2_CID_PIXEL_RATE:
1117 *type = V4L2_CTRL_TYPE_INTEGER64;
1118 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
1119 break;
1120 case V4L2_CID_DETECT_MD_REGION_GRID:
1121 *type = V4L2_CTRL_TYPE_U8;
1122 break;
1123 case V4L2_CID_DETECT_MD_THRESHOLD_GRID:
1124 *type = V4L2_CTRL_TYPE_U16;
1125 break;
1126 case V4L2_CID_RDS_TX_ALT_FREQS:
1127 *type = V4L2_CTRL_TYPE_U32;
1128 break;
1129 default:
1130 *type = V4L2_CTRL_TYPE_INTEGER;
1131 break;
1132 }
1133 switch (id) {
1134 case V4L2_CID_MPEG_AUDIO_ENCODING:
1135 case V4L2_CID_MPEG_AUDIO_MODE:
1136 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
1137 case V4L2_CID_MPEG_VIDEO_B_FRAMES:
1138 case V4L2_CID_MPEG_STREAM_TYPE:
1139 *flags |= V4L2_CTRL_FLAG_UPDATE;
1140 break;
1141 case V4L2_CID_AUDIO_VOLUME:
1142 case V4L2_CID_AUDIO_BALANCE:
1143 case V4L2_CID_AUDIO_BASS:
1144 case V4L2_CID_AUDIO_TREBLE:
1145 case V4L2_CID_BRIGHTNESS:
1146 case V4L2_CID_CONTRAST:
1147 case V4L2_CID_SATURATION:
1148 case V4L2_CID_HUE:
1149 case V4L2_CID_RED_BALANCE:
1150 case V4L2_CID_BLUE_BALANCE:
1151 case V4L2_CID_GAMMA:
1152 case V4L2_CID_SHARPNESS:
1153 case V4L2_CID_CHROMA_GAIN:
1154 case V4L2_CID_RDS_TX_DEVIATION:
1155 case V4L2_CID_AUDIO_LIMITER_RELEASE_TIME:
1156 case V4L2_CID_AUDIO_LIMITER_DEVIATION:
1157 case V4L2_CID_AUDIO_COMPRESSION_GAIN:
1158 case V4L2_CID_AUDIO_COMPRESSION_THRESHOLD:
1159 case V4L2_CID_AUDIO_COMPRESSION_ATTACK_TIME:
1160 case V4L2_CID_AUDIO_COMPRESSION_RELEASE_TIME:
1161 case V4L2_CID_PILOT_TONE_DEVIATION:
1162 case V4L2_CID_PILOT_TONE_FREQUENCY:
1163 case V4L2_CID_TUNE_POWER_LEVEL:
1164 case V4L2_CID_TUNE_ANTENNA_CAPACITOR:
1165 case V4L2_CID_RF_TUNER_RF_GAIN:
1166 case V4L2_CID_RF_TUNER_LNA_GAIN:
1167 case V4L2_CID_RF_TUNER_MIXER_GAIN:
1168 case V4L2_CID_RF_TUNER_IF_GAIN:
1169 case V4L2_CID_RF_TUNER_BANDWIDTH:
1170 case V4L2_CID_DETECT_MD_GLOBAL_THRESHOLD:
1171 *flags |= V4L2_CTRL_FLAG_SLIDER;
1172 break;
1173 case V4L2_CID_PAN_RELATIVE:
1174 case V4L2_CID_TILT_RELATIVE:
1175 case V4L2_CID_FOCUS_RELATIVE:
1176 case V4L2_CID_IRIS_RELATIVE:
1177 case V4L2_CID_ZOOM_RELATIVE:
1178 *flags |= V4L2_CTRL_FLAG_WRITE_ONLY |
1179 V4L2_CTRL_FLAG_EXECUTE_ON_WRITE;
1180 break;
1181 case V4L2_CID_FLASH_STROBE_STATUS:
1182 case V4L2_CID_AUTO_FOCUS_STATUS:
1183 case V4L2_CID_FLASH_READY:
1184 case V4L2_CID_DV_TX_HOTPLUG:
1185 case V4L2_CID_DV_TX_RXSENSE:
1186 case V4L2_CID_DV_TX_EDID_PRESENT:
1187 case V4L2_CID_DV_RX_POWER_PRESENT:
1188 case V4L2_CID_RDS_RX_PTY:
1189 case V4L2_CID_RDS_RX_PS_NAME:
1190 case V4L2_CID_RDS_RX_RADIO_TEXT:
1191 case V4L2_CID_RDS_RX_TRAFFIC_ANNOUNCEMENT:
1192 case V4L2_CID_RDS_RX_TRAFFIC_PROGRAM:
1193 case V4L2_CID_RDS_RX_MUSIC_SPEECH:
1194 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
1195 break;
1196 case V4L2_CID_RF_TUNER_PLL_LOCK:
1197 *flags |= V4L2_CTRL_FLAG_VOLATILE;
1198 break;
1199 }
1200 }
1201 EXPORT_SYMBOL(v4l2_ctrl_fill);
1202
1203 static void fill_event(struct v4l2_event *ev, struct v4l2_ctrl *ctrl, u32 changes)
1204 {
1205 memset(ev->reserved, 0, sizeof(ev->reserved));
1206 ev->type = V4L2_EVENT_CTRL;
1207 ev->id = ctrl->id;
1208 ev->u.ctrl.changes = changes;
1209 ev->u.ctrl.type = ctrl->type;
1210 ev->u.ctrl.flags = ctrl->flags;
1211 if (ctrl->is_ptr)
1212 ev->u.ctrl.value64 = 0;
1213 else
1214 ev->u.ctrl.value64 = *ctrl->p_cur.p_s64;
1215 ev->u.ctrl.minimum = ctrl->minimum;
1216 ev->u.ctrl.maximum = ctrl->maximum;
1217 if (ctrl->type == V4L2_CTRL_TYPE_MENU
1218 || ctrl->type == V4L2_CTRL_TYPE_INTEGER_MENU)
1219 ev->u.ctrl.step = 1;
1220 else
1221 ev->u.ctrl.step = ctrl->step;
1222 ev->u.ctrl.default_value = ctrl->default_value;
1223 }
1224
1225 static void send_event(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, u32 changes)
1226 {
1227 struct v4l2_event ev;
1228 struct v4l2_subscribed_event *sev;
1229
1230 if (list_empty(&ctrl->ev_subs))
1231 return;
1232 fill_event(&ev, ctrl, changes);
1233
1234 list_for_each_entry(sev, &ctrl->ev_subs, node)
1235 if (sev->fh != fh ||
1236 (sev->flags & V4L2_EVENT_SUB_FL_ALLOW_FEEDBACK))
1237 v4l2_event_queue_fh(sev->fh, &ev);
1238 }
1239
1240 static bool std_equal(const struct v4l2_ctrl *ctrl, u32 idx,
1241 union v4l2_ctrl_ptr ptr1,
1242 union v4l2_ctrl_ptr ptr2)
1243 {
1244 switch (ctrl->type) {
1245 case V4L2_CTRL_TYPE_BUTTON:
1246 return false;
1247 case V4L2_CTRL_TYPE_STRING:
1248 idx *= ctrl->elem_size;
1249 /* strings are always 0-terminated */
1250 return !strcmp(ptr1.p_char + idx, ptr2.p_char + idx);
1251 case V4L2_CTRL_TYPE_INTEGER64:
1252 return ptr1.p_s64[idx] == ptr2.p_s64[idx];
1253 case V4L2_CTRL_TYPE_U8:
1254 return ptr1.p_u8[idx] == ptr2.p_u8[idx];
1255 case V4L2_CTRL_TYPE_U16:
1256 return ptr1.p_u16[idx] == ptr2.p_u16[idx];
1257 case V4L2_CTRL_TYPE_U32:
1258 return ptr1.p_u32[idx] == ptr2.p_u32[idx];
1259 default:
1260 if (ctrl->is_int)
1261 return ptr1.p_s32[idx] == ptr2.p_s32[idx];
1262 idx *= ctrl->elem_size;
1263 return !memcmp(ptr1.p + idx, ptr2.p + idx, ctrl->elem_size);
1264 }
1265 }
1266
1267 static void std_init(const struct v4l2_ctrl *ctrl, u32 idx,
1268 union v4l2_ctrl_ptr ptr)
1269 {
1270 switch (ctrl->type) {
1271 case V4L2_CTRL_TYPE_STRING:
1272 idx *= ctrl->elem_size;
1273 memset(ptr.p_char + idx, ' ', ctrl->minimum);
1274 ptr.p_char[idx + ctrl->minimum] = '\0';
1275 break;
1276 case V4L2_CTRL_TYPE_INTEGER64:
1277 ptr.p_s64[idx] = ctrl->default_value;
1278 break;
1279 case V4L2_CTRL_TYPE_INTEGER:
1280 case V4L2_CTRL_TYPE_INTEGER_MENU:
1281 case V4L2_CTRL_TYPE_MENU:
1282 case V4L2_CTRL_TYPE_BITMASK:
1283 case V4L2_CTRL_TYPE_BOOLEAN:
1284 ptr.p_s32[idx] = ctrl->default_value;
1285 break;
1286 case V4L2_CTRL_TYPE_U8:
1287 ptr.p_u8[idx] = ctrl->default_value;
1288 break;
1289 case V4L2_CTRL_TYPE_U16:
1290 ptr.p_u16[idx] = ctrl->default_value;
1291 break;
1292 case V4L2_CTRL_TYPE_U32:
1293 ptr.p_u32[idx] = ctrl->default_value;
1294 break;
1295 default:
1296 idx *= ctrl->elem_size;
1297 memset(ptr.p + idx, 0, ctrl->elem_size);
1298 break;
1299 }
1300 }
1301
1302 static void std_log(const struct v4l2_ctrl *ctrl)
1303 {
1304 union v4l2_ctrl_ptr ptr = ctrl->p_cur;
1305
1306 if (ctrl->is_array) {
1307 unsigned i;
1308
1309 for (i = 0; i < ctrl->nr_of_dims; i++)
1310 pr_cont("[%u]", ctrl->dims[i]);
1311 pr_cont(" ");
1312 }
1313
1314 switch (ctrl->type) {
1315 case V4L2_CTRL_TYPE_INTEGER:
1316 pr_cont("%d", *ptr.p_s32);
1317 break;
1318 case V4L2_CTRL_TYPE_BOOLEAN:
1319 pr_cont("%s", *ptr.p_s32 ? "true" : "false");
1320 break;
1321 case V4L2_CTRL_TYPE_MENU:
1322 pr_cont("%s", ctrl->qmenu[*ptr.p_s32]);
1323 break;
1324 case V4L2_CTRL_TYPE_INTEGER_MENU:
1325 pr_cont("%lld", ctrl->qmenu_int[*ptr.p_s32]);
1326 break;
1327 case V4L2_CTRL_TYPE_BITMASK:
1328 pr_cont("0x%08x", *ptr.p_s32);
1329 break;
1330 case V4L2_CTRL_TYPE_INTEGER64:
1331 pr_cont("%lld", *ptr.p_s64);
1332 break;
1333 case V4L2_CTRL_TYPE_STRING:
1334 pr_cont("%s", ptr.p_char);
1335 break;
1336 case V4L2_CTRL_TYPE_U8:
1337 pr_cont("%u", (unsigned)*ptr.p_u8);
1338 break;
1339 case V4L2_CTRL_TYPE_U16:
1340 pr_cont("%u", (unsigned)*ptr.p_u16);
1341 break;
1342 case V4L2_CTRL_TYPE_U32:
1343 pr_cont("%u", (unsigned)*ptr.p_u32);
1344 break;
1345 default:
1346 pr_cont("unknown type %d", ctrl->type);
1347 break;
1348 }
1349 }
1350
1351 /*
1352 * Round towards the closest legal value. Be careful when we are
1353 * close to the maximum range of the control type to prevent
1354 * wrap-arounds.
1355 */
1356 #define ROUND_TO_RANGE(val, offset_type, ctrl) \
1357 ({ \
1358 offset_type offset; \
1359 if ((ctrl)->maximum >= 0 && \
1360 val >= (ctrl)->maximum - (s32)((ctrl)->step / 2)) \
1361 val = (ctrl)->maximum; \
1362 else \
1363 val += (s32)((ctrl)->step / 2); \
1364 val = clamp_t(typeof(val), val, \
1365 (ctrl)->minimum, (ctrl)->maximum); \
1366 offset = (val) - (ctrl)->minimum; \
1367 offset = (ctrl)->step * (offset / (u32)(ctrl)->step); \
1368 val = (ctrl)->minimum + offset; \
1369 0; \
1370 })
1371
1372 /* Validate a new control */
1373 static int std_validate(const struct v4l2_ctrl *ctrl, u32 idx,
1374 union v4l2_ctrl_ptr ptr)
1375 {
1376 size_t len;
1377 u64 offset;
1378 s64 val;
1379
1380 switch (ctrl->type) {
1381 case V4L2_CTRL_TYPE_INTEGER:
1382 return ROUND_TO_RANGE(ptr.p_s32[idx], u32, ctrl);
1383 case V4L2_CTRL_TYPE_INTEGER64:
1384 /*
1385 * We can't use the ROUND_TO_RANGE define here due to
1386 * the u64 divide that needs special care.
1387 */
1388 val = ptr.p_s64[idx];
1389 if (ctrl->maximum >= 0 && val >= ctrl->maximum - (s64)(ctrl->step / 2))
1390 val = ctrl->maximum;
1391 else
1392 val += (s64)(ctrl->step / 2);
1393 val = clamp_t(s64, val, ctrl->minimum, ctrl->maximum);
1394 offset = val - ctrl->minimum;
1395 do_div(offset, ctrl->step);
1396 ptr.p_s64[idx] = ctrl->minimum + offset * ctrl->step;
1397 return 0;
1398 case V4L2_CTRL_TYPE_U8:
1399 return ROUND_TO_RANGE(ptr.p_u8[idx], u8, ctrl);
1400 case V4L2_CTRL_TYPE_U16:
1401 return ROUND_TO_RANGE(ptr.p_u16[idx], u16, ctrl);
1402 case V4L2_CTRL_TYPE_U32:
1403 return ROUND_TO_RANGE(ptr.p_u32[idx], u32, ctrl);
1404
1405 case V4L2_CTRL_TYPE_BOOLEAN:
1406 ptr.p_s32[idx] = !!ptr.p_s32[idx];
1407 return 0;
1408
1409 case V4L2_CTRL_TYPE_MENU:
1410 case V4L2_CTRL_TYPE_INTEGER_MENU:
1411 if (ptr.p_s32[idx] < ctrl->minimum || ptr.p_s32[idx] > ctrl->maximum)
1412 return -ERANGE;
1413 if (ctrl->menu_skip_mask & (1 << ptr.p_s32[idx]))
1414 return -EINVAL;
1415 if (ctrl->type == V4L2_CTRL_TYPE_MENU &&
1416 ctrl->qmenu[ptr.p_s32[idx]][0] == '\0')
1417 return -EINVAL;
1418 return 0;
1419
1420 case V4L2_CTRL_TYPE_BITMASK:
1421 ptr.p_s32[idx] &= ctrl->maximum;
1422 return 0;
1423
1424 case V4L2_CTRL_TYPE_BUTTON:
1425 case V4L2_CTRL_TYPE_CTRL_CLASS:
1426 ptr.p_s32[idx] = 0;
1427 return 0;
1428
1429 case V4L2_CTRL_TYPE_STRING:
1430 idx *= ctrl->elem_size;
1431 len = strlen(ptr.p_char + idx);
1432 if (len < ctrl->minimum)
1433 return -ERANGE;
1434 if ((len - (u32)ctrl->minimum) % (u32)ctrl->step)
1435 return -ERANGE;
1436 return 0;
1437
1438 default:
1439 return -EINVAL;
1440 }
1441 }
1442
1443 static const struct v4l2_ctrl_type_ops std_type_ops = {
1444 .equal = std_equal,
1445 .init = std_init,
1446 .log = std_log,
1447 .validate = std_validate,
1448 };
1449
1450 /* Helper function: copy the given control value back to the caller */
1451 static int ptr_to_user(struct v4l2_ext_control *c,
1452 struct v4l2_ctrl *ctrl,
1453 union v4l2_ctrl_ptr ptr)
1454 {
1455 u32 len;
1456
1457 if (ctrl->is_ptr && !ctrl->is_string)
1458 return copy_to_user(c->ptr, ptr.p, c->size) ?
1459 -EFAULT : 0;
1460
1461 switch (ctrl->type) {
1462 case V4L2_CTRL_TYPE_STRING:
1463 len = strlen(ptr.p_char);
1464 if (c->size < len + 1) {
1465 c->size = ctrl->elem_size;
1466 return -ENOSPC;
1467 }
1468 return copy_to_user(c->string, ptr.p_char, len + 1) ?
1469 -EFAULT : 0;
1470 case V4L2_CTRL_TYPE_INTEGER64:
1471 c->value64 = *ptr.p_s64;
1472 break;
1473 default:
1474 c->value = *ptr.p_s32;
1475 break;
1476 }
1477 return 0;
1478 }
1479
1480 /* Helper function: copy the current control value back to the caller */
1481 static int cur_to_user(struct v4l2_ext_control *c,
1482 struct v4l2_ctrl *ctrl)
1483 {
1484 return ptr_to_user(c, ctrl, ctrl->p_cur);
1485 }
1486
1487 /* Helper function: copy the new control value back to the caller */
1488 static int new_to_user(struct v4l2_ext_control *c,
1489 struct v4l2_ctrl *ctrl)
1490 {
1491 return ptr_to_user(c, ctrl, ctrl->p_new);
1492 }
1493
1494 /* Helper function: copy the caller-provider value to the given control value */
1495 static int user_to_ptr(struct v4l2_ext_control *c,
1496 struct v4l2_ctrl *ctrl,
1497 union v4l2_ctrl_ptr ptr)
1498 {
1499 int ret;
1500 u32 size;
1501
1502 ctrl->is_new = 1;
1503 if (ctrl->is_ptr && !ctrl->is_string) {
1504 unsigned idx;
1505
1506 ret = copy_from_user(ptr.p, c->ptr, c->size) ? -EFAULT : 0;
1507 if (ret || !ctrl->is_array)
1508 return ret;
1509 for (idx = c->size / ctrl->elem_size; idx < ctrl->elems; idx++)
1510 ctrl->type_ops->init(ctrl, idx, ptr);
1511 return 0;
1512 }
1513
1514 switch (ctrl->type) {
1515 case V4L2_CTRL_TYPE_INTEGER64:
1516 *ptr.p_s64 = c->value64;
1517 break;
1518 case V4L2_CTRL_TYPE_STRING:
1519 size = c->size;
1520 if (size == 0)
1521 return -ERANGE;
1522 if (size > ctrl->maximum + 1)
1523 size = ctrl->maximum + 1;
1524 ret = copy_from_user(ptr.p_char, c->string, size) ? -EFAULT : 0;
1525 if (!ret) {
1526 char last = ptr.p_char[size - 1];
1527
1528 ptr.p_char[size - 1] = 0;
1529 /* If the string was longer than ctrl->maximum,
1530 then return an error. */
1531 if (strlen(ptr.p_char) == ctrl->maximum && last)
1532 return -ERANGE;
1533 }
1534 return ret;
1535 default:
1536 *ptr.p_s32 = c->value;
1537 break;
1538 }
1539 return 0;
1540 }
1541
1542 /* Helper function: copy the caller-provider value as the new control value */
1543 static int user_to_new(struct v4l2_ext_control *c,
1544 struct v4l2_ctrl *ctrl)
1545 {
1546 return user_to_ptr(c, ctrl, ctrl->p_new);
1547 }
1548
1549 /* Copy the one value to another. */
1550 static void ptr_to_ptr(struct v4l2_ctrl *ctrl,
1551 union v4l2_ctrl_ptr from, union v4l2_ctrl_ptr to)
1552 {
1553 if (ctrl == NULL)
1554 return;
1555 memcpy(to.p, from.p, ctrl->elems * ctrl->elem_size);
1556 }
1557
1558 /* Copy the new value to the current value. */
1559 static void new_to_cur(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, u32 ch_flags)
1560 {
1561 bool changed;
1562
1563 if (ctrl == NULL)
1564 return;
1565
1566 /* has_changed is set by cluster_changed */
1567 changed = ctrl->has_changed;
1568 if (changed)
1569 ptr_to_ptr(ctrl, ctrl->p_new, ctrl->p_cur);
1570
1571 if (ch_flags & V4L2_EVENT_CTRL_CH_FLAGS) {
1572 /* Note: CH_FLAGS is only set for auto clusters. */
1573 ctrl->flags &=
1574 ~(V4L2_CTRL_FLAG_INACTIVE | V4L2_CTRL_FLAG_VOLATILE);
1575 if (!is_cur_manual(ctrl->cluster[0])) {
1576 ctrl->flags |= V4L2_CTRL_FLAG_INACTIVE;
1577 if (ctrl->cluster[0]->has_volatiles)
1578 ctrl->flags |= V4L2_CTRL_FLAG_VOLATILE;
1579 }
1580 fh = NULL;
1581 }
1582 if (changed || ch_flags) {
1583 /* If a control was changed that was not one of the controls
1584 modified by the application, then send the event to all. */
1585 if (!ctrl->is_new)
1586 fh = NULL;
1587 send_event(fh, ctrl,
1588 (changed ? V4L2_EVENT_CTRL_CH_VALUE : 0) | ch_flags);
1589 if (ctrl->call_notify && changed && ctrl->handler->notify)
1590 ctrl->handler->notify(ctrl, ctrl->handler->notify_priv);
1591 }
1592 }
1593
1594 /* Copy the current value to the new value */
1595 static void cur_to_new(struct v4l2_ctrl *ctrl)
1596 {
1597 if (ctrl == NULL)
1598 return;
1599 ptr_to_ptr(ctrl, ctrl->p_cur, ctrl->p_new);
1600 }
1601
1602 /* Return non-zero if one or more of the controls in the cluster has a new
1603 value that differs from the current value. */
1604 static int cluster_changed(struct v4l2_ctrl *master)
1605 {
1606 bool changed = false;
1607 unsigned idx;
1608 int i;
1609
1610 for (i = 0; i < master->ncontrols; i++) {
1611 struct v4l2_ctrl *ctrl = master->cluster[i];
1612 bool ctrl_changed = false;
1613
1614 if (ctrl == NULL)
1615 continue;
1616
1617 if (ctrl->flags & V4L2_CTRL_FLAG_EXECUTE_ON_WRITE)
1618 changed = ctrl_changed = true;
1619
1620 /*
1621 * Set has_changed to false to avoid generating
1622 * the event V4L2_EVENT_CTRL_CH_VALUE
1623 */
1624 if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE) {
1625 ctrl->has_changed = false;
1626 continue;
1627 }
1628
1629 for (idx = 0; !ctrl_changed && idx < ctrl->elems; idx++)
1630 ctrl_changed = !ctrl->type_ops->equal(ctrl, idx,
1631 ctrl->p_cur, ctrl->p_new);
1632 ctrl->has_changed = ctrl_changed;
1633 changed |= ctrl->has_changed;
1634 }
1635 return changed;
1636 }
1637
1638 /* Control range checking */
1639 static int check_range(enum v4l2_ctrl_type type,
1640 s64 min, s64 max, u64 step, s64 def)
1641 {
1642 switch (type) {
1643 case V4L2_CTRL_TYPE_BOOLEAN:
1644 if (step != 1 || max > 1 || min < 0)
1645 return -ERANGE;
1646 /* fall through */
1647 case V4L2_CTRL_TYPE_U8:
1648 case V4L2_CTRL_TYPE_U16:
1649 case V4L2_CTRL_TYPE_U32:
1650 case V4L2_CTRL_TYPE_INTEGER:
1651 case V4L2_CTRL_TYPE_INTEGER64:
1652 if (step == 0 || min > max || def < min || def > max)
1653 return -ERANGE;
1654 return 0;
1655 case V4L2_CTRL_TYPE_BITMASK:
1656 if (step || min || !max || (def & ~max))
1657 return -ERANGE;
1658 return 0;
1659 case V4L2_CTRL_TYPE_MENU:
1660 case V4L2_CTRL_TYPE_INTEGER_MENU:
1661 if (min > max || def < min || def > max)
1662 return -ERANGE;
1663 /* Note: step == menu_skip_mask for menu controls.
1664 So here we check if the default value is masked out. */
1665 if (step && ((1 << def) & step))
1666 return -EINVAL;
1667 return 0;
1668 case V4L2_CTRL_TYPE_STRING:
1669 if (min > max || min < 0 || step < 1 || def)
1670 return -ERANGE;
1671 return 0;
1672 default:
1673 return 0;
1674 }
1675 }
1676
1677 /* Validate a new control */
1678 static int validate_new(const struct v4l2_ctrl *ctrl, union v4l2_ctrl_ptr p_new)
1679 {
1680 unsigned idx;
1681 int err = 0;
1682
1683 for (idx = 0; !err && idx < ctrl->elems; idx++)
1684 err = ctrl->type_ops->validate(ctrl, idx, p_new);
1685 return err;
1686 }
1687
1688 static inline u32 node2id(struct list_head *node)
1689 {
1690 return list_entry(node, struct v4l2_ctrl_ref, node)->ctrl->id;
1691 }
1692
1693 /* Set the handler's error code if it wasn't set earlier already */
1694 static inline int handler_set_err(struct v4l2_ctrl_handler *hdl, int err)
1695 {
1696 if (hdl->error == 0)
1697 hdl->error = err;
1698 return err;
1699 }
1700
1701 /* Initialize the handler */
1702 int v4l2_ctrl_handler_init_class(struct v4l2_ctrl_handler *hdl,
1703 unsigned nr_of_controls_hint,
1704 struct lock_class_key *key, const char *name)
1705 {
1706 hdl->lock = &hdl->_lock;
1707 mutex_init(hdl->lock);
1708 lockdep_set_class_and_name(hdl->lock, key, name);
1709 INIT_LIST_HEAD(&hdl->ctrls);
1710 INIT_LIST_HEAD(&hdl->ctrl_refs);
1711 hdl->nr_of_buckets = 1 + nr_of_controls_hint / 8;
1712 hdl->buckets = kcalloc(hdl->nr_of_buckets, sizeof(hdl->buckets[0]),
1713 GFP_KERNEL);
1714 hdl->error = hdl->buckets ? 0 : -ENOMEM;
1715 return hdl->error;
1716 }
1717 EXPORT_SYMBOL(v4l2_ctrl_handler_init_class);
1718
1719 /* Free all controls and control refs */
1720 void v4l2_ctrl_handler_free(struct v4l2_ctrl_handler *hdl)
1721 {
1722 struct v4l2_ctrl_ref *ref, *next_ref;
1723 struct v4l2_ctrl *ctrl, *next_ctrl;
1724 struct v4l2_subscribed_event *sev, *next_sev;
1725
1726 if (hdl == NULL || hdl->buckets == NULL)
1727 return;
1728
1729 mutex_lock(hdl->lock);
1730 /* Free all nodes */
1731 list_for_each_entry_safe(ref, next_ref, &hdl->ctrl_refs, node) {
1732 list_del(&ref->node);
1733 kfree(ref);
1734 }
1735 /* Free all controls owned by the handler */
1736 list_for_each_entry_safe(ctrl, next_ctrl, &hdl->ctrls, node) {
1737 list_del(&ctrl->node);
1738 list_for_each_entry_safe(sev, next_sev, &ctrl->ev_subs, node)
1739 list_del(&sev->node);
1740 kfree(ctrl);
1741 }
1742 kfree(hdl->buckets);
1743 hdl->buckets = NULL;
1744 hdl->cached = NULL;
1745 hdl->error = 0;
1746 mutex_unlock(hdl->lock);
1747 }
1748 EXPORT_SYMBOL(v4l2_ctrl_handler_free);
1749
1750 /* For backwards compatibility: V4L2_CID_PRIVATE_BASE should no longer
1751 be used except in G_CTRL, S_CTRL, QUERYCTRL and QUERYMENU when dealing
1752 with applications that do not use the NEXT_CTRL flag.
1753
1754 We just find the n-th private user control. It's O(N), but that should not
1755 be an issue in this particular case. */
1756 static struct v4l2_ctrl_ref *find_private_ref(
1757 struct v4l2_ctrl_handler *hdl, u32 id)
1758 {
1759 struct v4l2_ctrl_ref *ref;
1760
1761 id -= V4L2_CID_PRIVATE_BASE;
1762 list_for_each_entry(ref, &hdl->ctrl_refs, node) {
1763 /* Search for private user controls that are compatible with
1764 VIDIOC_G/S_CTRL. */
1765 if (V4L2_CTRL_ID2CLASS(ref->ctrl->id) == V4L2_CTRL_CLASS_USER &&
1766 V4L2_CTRL_DRIVER_PRIV(ref->ctrl->id)) {
1767 if (!ref->ctrl->is_int)
1768 continue;
1769 if (id == 0)
1770 return ref;
1771 id--;
1772 }
1773 }
1774 return NULL;
1775 }
1776
1777 /* Find a control with the given ID. */
1778 static struct v4l2_ctrl_ref *find_ref(struct v4l2_ctrl_handler *hdl, u32 id)
1779 {
1780 struct v4l2_ctrl_ref *ref;
1781 int bucket;
1782
1783 id &= V4L2_CTRL_ID_MASK;
1784
1785 /* Old-style private controls need special handling */
1786 if (id >= V4L2_CID_PRIVATE_BASE)
1787 return find_private_ref(hdl, id);
1788 bucket = id % hdl->nr_of_buckets;
1789
1790 /* Simple optimization: cache the last control found */
1791 if (hdl->cached && hdl->cached->ctrl->id == id)
1792 return hdl->cached;
1793
1794 /* Not in cache, search the hash */
1795 ref = hdl->buckets ? hdl->buckets[bucket] : NULL;
1796 while (ref && ref->ctrl->id != id)
1797 ref = ref->next;
1798
1799 if (ref)
1800 hdl->cached = ref; /* cache it! */
1801 return ref;
1802 }
1803
1804 /* Find a control with the given ID. Take the handler's lock first. */
1805 static struct v4l2_ctrl_ref *find_ref_lock(
1806 struct v4l2_ctrl_handler *hdl, u32 id)
1807 {
1808 struct v4l2_ctrl_ref *ref = NULL;
1809
1810 if (hdl) {
1811 mutex_lock(hdl->lock);
1812 ref = find_ref(hdl, id);
1813 mutex_unlock(hdl->lock);
1814 }
1815 return ref;
1816 }
1817
1818 /* Find a control with the given ID. */
1819 struct v4l2_ctrl *v4l2_ctrl_find(struct v4l2_ctrl_handler *hdl, u32 id)
1820 {
1821 struct v4l2_ctrl_ref *ref = find_ref_lock(hdl, id);
1822
1823 return ref ? ref->ctrl : NULL;
1824 }
1825 EXPORT_SYMBOL(v4l2_ctrl_find);
1826
1827 /* Allocate a new v4l2_ctrl_ref and hook it into the handler. */
1828 static int handler_new_ref(struct v4l2_ctrl_handler *hdl,
1829 struct v4l2_ctrl *ctrl)
1830 {
1831 struct v4l2_ctrl_ref *ref;
1832 struct v4l2_ctrl_ref *new_ref;
1833 u32 id = ctrl->id;
1834 u32 class_ctrl = V4L2_CTRL_ID2CLASS(id) | 1;
1835 int bucket = id % hdl->nr_of_buckets; /* which bucket to use */
1836
1837 /*
1838 * Automatically add the control class if it is not yet present and
1839 * the new control is not a compound control.
1840 */
1841 if (ctrl->type < V4L2_CTRL_COMPOUND_TYPES &&
1842 id != class_ctrl && find_ref_lock(hdl, class_ctrl) == NULL)
1843 if (!v4l2_ctrl_new_std(hdl, NULL, class_ctrl, 0, 0, 0, 0))
1844 return hdl->error;
1845
1846 if (hdl->error)
1847 return hdl->error;
1848
1849 new_ref = kzalloc(sizeof(*new_ref), GFP_KERNEL);
1850 if (!new_ref)
1851 return handler_set_err(hdl, -ENOMEM);
1852 new_ref->ctrl = ctrl;
1853 if (ctrl->handler == hdl) {
1854 /* By default each control starts in a cluster of its own.
1855 new_ref->ctrl is basically a cluster array with one
1856 element, so that's perfect to use as the cluster pointer.
1857 But only do this for the handler that owns the control. */
1858 ctrl->cluster = &new_ref->ctrl;
1859 ctrl->ncontrols = 1;
1860 }
1861
1862 INIT_LIST_HEAD(&new_ref->node);
1863
1864 mutex_lock(hdl->lock);
1865
1866 /* Add immediately at the end of the list if the list is empty, or if
1867 the last element in the list has a lower ID.
1868 This ensures that when elements are added in ascending order the
1869 insertion is an O(1) operation. */
1870 if (list_empty(&hdl->ctrl_refs) || id > node2id(hdl->ctrl_refs.prev)) {
1871 list_add_tail(&new_ref->node, &hdl->ctrl_refs);
1872 goto insert_in_hash;
1873 }
1874
1875 /* Find insert position in sorted list */
1876 list_for_each_entry(ref, &hdl->ctrl_refs, node) {
1877 if (ref->ctrl->id < id)
1878 continue;
1879 /* Don't add duplicates */
1880 if (ref->ctrl->id == id) {
1881 kfree(new_ref);
1882 goto unlock;
1883 }
1884 list_add(&new_ref->node, ref->node.prev);
1885 break;
1886 }
1887
1888 insert_in_hash:
1889 /* Insert the control node in the hash */
1890 new_ref->next = hdl->buckets[bucket];
1891 hdl->buckets[bucket] = new_ref;
1892
1893 unlock:
1894 mutex_unlock(hdl->lock);
1895 return 0;
1896 }
1897
1898 /* Add a new control */
1899 static struct v4l2_ctrl *v4l2_ctrl_new(struct v4l2_ctrl_handler *hdl,
1900 const struct v4l2_ctrl_ops *ops,
1901 const struct v4l2_ctrl_type_ops *type_ops,
1902 u32 id, const char *name, enum v4l2_ctrl_type type,
1903 s64 min, s64 max, u64 step, s64 def,
1904 const u32 dims[V4L2_CTRL_MAX_DIMS], u32 elem_size,
1905 u32 flags, const char * const *qmenu,
1906 const s64 *qmenu_int, void *priv)
1907 {
1908 struct v4l2_ctrl *ctrl;
1909 unsigned sz_extra;
1910 unsigned nr_of_dims = 0;
1911 unsigned elems = 1;
1912 bool is_array;
1913 unsigned tot_ctrl_size;
1914 unsigned idx;
1915 void *data;
1916 int err;
1917
1918 if (hdl->error)
1919 return NULL;
1920
1921 while (dims && dims[nr_of_dims]) {
1922 elems *= dims[nr_of_dims];
1923 nr_of_dims++;
1924 if (nr_of_dims == V4L2_CTRL_MAX_DIMS)
1925 break;
1926 }
1927 is_array = nr_of_dims > 0;
1928
1929 /* Prefill elem_size for all types handled by std_type_ops */
1930 switch (type) {
1931 case V4L2_CTRL_TYPE_INTEGER64:
1932 elem_size = sizeof(s64);
1933 break;
1934 case V4L2_CTRL_TYPE_STRING:
1935 elem_size = max + 1;
1936 break;
1937 case V4L2_CTRL_TYPE_U8:
1938 elem_size = sizeof(u8);
1939 break;
1940 case V4L2_CTRL_TYPE_U16:
1941 elem_size = sizeof(u16);
1942 break;
1943 case V4L2_CTRL_TYPE_U32:
1944 elem_size = sizeof(u32);
1945 break;
1946 default:
1947 if (type < V4L2_CTRL_COMPOUND_TYPES)
1948 elem_size = sizeof(s32);
1949 break;
1950 }
1951 tot_ctrl_size = elem_size * elems;
1952
1953 /* Sanity checks */
1954 if (id == 0 || name == NULL || !elem_size ||
1955 id >= V4L2_CID_PRIVATE_BASE ||
1956 (type == V4L2_CTRL_TYPE_MENU && qmenu == NULL) ||
1957 (type == V4L2_CTRL_TYPE_INTEGER_MENU && qmenu_int == NULL)) {
1958 handler_set_err(hdl, -ERANGE);
1959 return NULL;
1960 }
1961 err = check_range(type, min, max, step, def);
1962 if (err) {
1963 handler_set_err(hdl, err);
1964 return NULL;
1965 }
1966 if (type == V4L2_CTRL_TYPE_BITMASK && ((def & ~max) || min || step)) {
1967 handler_set_err(hdl, -ERANGE);
1968 return NULL;
1969 }
1970 if (is_array &&
1971 (type == V4L2_CTRL_TYPE_BUTTON ||
1972 type == V4L2_CTRL_TYPE_CTRL_CLASS)) {
1973 handler_set_err(hdl, -EINVAL);
1974 return NULL;
1975 }
1976
1977 sz_extra = 0;
1978 if (type == V4L2_CTRL_TYPE_BUTTON)
1979 flags |= V4L2_CTRL_FLAG_WRITE_ONLY |
1980 V4L2_CTRL_FLAG_EXECUTE_ON_WRITE;
1981 else if (type == V4L2_CTRL_TYPE_CTRL_CLASS)
1982 flags |= V4L2_CTRL_FLAG_READ_ONLY;
1983 else if (type == V4L2_CTRL_TYPE_INTEGER64 ||
1984 type == V4L2_CTRL_TYPE_STRING ||
1985 type >= V4L2_CTRL_COMPOUND_TYPES ||
1986 is_array)
1987 sz_extra += 2 * tot_ctrl_size;
1988
1989 ctrl = kzalloc(sizeof(*ctrl) + sz_extra, GFP_KERNEL);
1990 if (ctrl == NULL) {
1991 handler_set_err(hdl, -ENOMEM);
1992 return NULL;
1993 }
1994
1995 INIT_LIST_HEAD(&ctrl->node);
1996 INIT_LIST_HEAD(&ctrl->ev_subs);
1997 ctrl->handler = hdl;
1998 ctrl->ops = ops;
1999 ctrl->type_ops = type_ops ? type_ops : &std_type_ops;
2000 ctrl->id = id;
2001 ctrl->name = name;
2002 ctrl->type = type;
2003 ctrl->flags = flags;
2004 ctrl->minimum = min;
2005 ctrl->maximum = max;
2006 ctrl->step = step;
2007 ctrl->default_value = def;
2008 ctrl->is_string = !is_array && type == V4L2_CTRL_TYPE_STRING;
2009 ctrl->is_ptr = is_array || type >= V4L2_CTRL_COMPOUND_TYPES || ctrl->is_string;
2010 ctrl->is_int = !ctrl->is_ptr && type != V4L2_CTRL_TYPE_INTEGER64;
2011 ctrl->is_array = is_array;
2012 ctrl->elems = elems;
2013 ctrl->nr_of_dims = nr_of_dims;
2014 if (nr_of_dims)
2015 memcpy(ctrl->dims, dims, nr_of_dims * sizeof(dims[0]));
2016 ctrl->elem_size = elem_size;
2017 if (type == V4L2_CTRL_TYPE_MENU)
2018 ctrl->qmenu = qmenu;
2019 else if (type == V4L2_CTRL_TYPE_INTEGER_MENU)
2020 ctrl->qmenu_int = qmenu_int;
2021 ctrl->priv = priv;
2022 ctrl->cur.val = ctrl->val = def;
2023 data = &ctrl[1];
2024
2025 if (!ctrl->is_int) {
2026 ctrl->p_new.p = data;
2027 ctrl->p_cur.p = data + tot_ctrl_size;
2028 } else {
2029 ctrl->p_new.p = &ctrl->val;
2030 ctrl->p_cur.p = &ctrl->cur.val;
2031 }
2032 for (idx = 0; idx < elems; idx++) {
2033 ctrl->type_ops->init(ctrl, idx, ctrl->p_cur);
2034 ctrl->type_ops->init(ctrl, idx, ctrl->p_new);
2035 }
2036
2037 if (handler_new_ref(hdl, ctrl)) {
2038 kfree(ctrl);
2039 return NULL;
2040 }
2041 mutex_lock(hdl->lock);
2042 list_add_tail(&ctrl->node, &hdl->ctrls);
2043 mutex_unlock(hdl->lock);
2044 return ctrl;
2045 }
2046
2047 struct v4l2_ctrl *v4l2_ctrl_new_custom(struct v4l2_ctrl_handler *hdl,
2048 const struct v4l2_ctrl_config *cfg, void *priv)
2049 {
2050 bool is_menu;
2051 struct v4l2_ctrl *ctrl;
2052 const char *name = cfg->name;
2053 const char * const *qmenu = cfg->qmenu;
2054 const s64 *qmenu_int = cfg->qmenu_int;
2055 enum v4l2_ctrl_type type = cfg->type;
2056 u32 flags = cfg->flags;
2057 s64 min = cfg->min;
2058 s64 max = cfg->max;
2059 u64 step = cfg->step;
2060 s64 def = cfg->def;
2061
2062 if (name == NULL)
2063 v4l2_ctrl_fill(cfg->id, &name, &type, &min, &max, &step,
2064 &def, &flags);
2065
2066 is_menu = (cfg->type == V4L2_CTRL_TYPE_MENU ||
2067 cfg->type == V4L2_CTRL_TYPE_INTEGER_MENU);
2068 if (is_menu)
2069 WARN_ON(step);
2070 else
2071 WARN_ON(cfg->menu_skip_mask);
2072 if (cfg->type == V4L2_CTRL_TYPE_MENU && qmenu == NULL)
2073 qmenu = v4l2_ctrl_get_menu(cfg->id);
2074 else if (cfg->type == V4L2_CTRL_TYPE_INTEGER_MENU &&
2075 qmenu_int == NULL) {
2076 handler_set_err(hdl, -EINVAL);
2077 return NULL;
2078 }
2079
2080 ctrl = v4l2_ctrl_new(hdl, cfg->ops, cfg->type_ops, cfg->id, name,
2081 type, min, max,
2082 is_menu ? cfg->menu_skip_mask : step, def,
2083 cfg->dims, cfg->elem_size,
2084 flags, qmenu, qmenu_int, priv);
2085 if (ctrl)
2086 ctrl->is_private = cfg->is_private;
2087 return ctrl;
2088 }
2089 EXPORT_SYMBOL(v4l2_ctrl_new_custom);
2090
2091 /* Helper function for standard non-menu controls */
2092 struct v4l2_ctrl *v4l2_ctrl_new_std(struct v4l2_ctrl_handler *hdl,
2093 const struct v4l2_ctrl_ops *ops,
2094 u32 id, s64 min, s64 max, u64 step, s64 def)
2095 {
2096 const char *name;
2097 enum v4l2_ctrl_type type;
2098 u32 flags;
2099
2100 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
2101 if (type == V4L2_CTRL_TYPE_MENU ||
2102 type == V4L2_CTRL_TYPE_INTEGER_MENU ||
2103 type >= V4L2_CTRL_COMPOUND_TYPES) {
2104 handler_set_err(hdl, -EINVAL);
2105 return NULL;
2106 }
2107 return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
2108 min, max, step, def, NULL, 0,
2109 flags, NULL, NULL, NULL);
2110 }
2111 EXPORT_SYMBOL(v4l2_ctrl_new_std);
2112
2113 /* Helper function for standard menu controls */
2114 struct v4l2_ctrl *v4l2_ctrl_new_std_menu(struct v4l2_ctrl_handler *hdl,
2115 const struct v4l2_ctrl_ops *ops,
2116 u32 id, u8 _max, u64 mask, u8 _def)
2117 {
2118 const char * const *qmenu = NULL;
2119 const s64 *qmenu_int = NULL;
2120 unsigned int qmenu_int_len = 0;
2121 const char *name;
2122 enum v4l2_ctrl_type type;
2123 s64 min;
2124 s64 max = _max;
2125 s64 def = _def;
2126 u64 step;
2127 u32 flags;
2128
2129 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
2130
2131 if (type == V4L2_CTRL_TYPE_MENU)
2132 qmenu = v4l2_ctrl_get_menu(id);
2133 else if (type == V4L2_CTRL_TYPE_INTEGER_MENU)
2134 qmenu_int = v4l2_ctrl_get_int_menu(id, &qmenu_int_len);
2135
2136 if ((!qmenu && !qmenu_int) || (qmenu_int && max > qmenu_int_len)) {
2137 handler_set_err(hdl, -EINVAL);
2138 return NULL;
2139 }
2140 return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
2141 0, max, mask, def, NULL, 0,
2142 flags, qmenu, qmenu_int, NULL);
2143 }
2144 EXPORT_SYMBOL(v4l2_ctrl_new_std_menu);
2145
2146 /* Helper function for standard menu controls with driver defined menu */
2147 struct v4l2_ctrl *v4l2_ctrl_new_std_menu_items(struct v4l2_ctrl_handler *hdl,
2148 const struct v4l2_ctrl_ops *ops, u32 id, u8 _max,
2149 u64 mask, u8 _def, const char * const *qmenu)
2150 {
2151 enum v4l2_ctrl_type type;
2152 const char *name;
2153 u32 flags;
2154 u64 step;
2155 s64 min;
2156 s64 max = _max;
2157 s64 def = _def;
2158
2159 /* v4l2_ctrl_new_std_menu_items() should only be called for
2160 * standard controls without a standard menu.
2161 */
2162 if (v4l2_ctrl_get_menu(id)) {
2163 handler_set_err(hdl, -EINVAL);
2164 return NULL;
2165 }
2166
2167 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
2168 if (type != V4L2_CTRL_TYPE_MENU || qmenu == NULL) {
2169 handler_set_err(hdl, -EINVAL);
2170 return NULL;
2171 }
2172 return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
2173 0, max, mask, def, NULL, 0,
2174 flags, qmenu, NULL, NULL);
2175
2176 }
2177 EXPORT_SYMBOL(v4l2_ctrl_new_std_menu_items);
2178
2179 /* Helper function for standard integer menu controls */
2180 struct v4l2_ctrl *v4l2_ctrl_new_int_menu(struct v4l2_ctrl_handler *hdl,
2181 const struct v4l2_ctrl_ops *ops,
2182 u32 id, u8 _max, u8 _def, const s64 *qmenu_int)
2183 {
2184 const char *name;
2185 enum v4l2_ctrl_type type;
2186 s64 min;
2187 u64 step;
2188 s64 max = _max;
2189 s64 def = _def;
2190 u32 flags;
2191
2192 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
2193 if (type != V4L2_CTRL_TYPE_INTEGER_MENU) {
2194 handler_set_err(hdl, -EINVAL);
2195 return NULL;
2196 }
2197 return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
2198 0, max, 0, def, NULL, 0,
2199 flags, NULL, qmenu_int, NULL);
2200 }
2201 EXPORT_SYMBOL(v4l2_ctrl_new_int_menu);
2202
2203 /* Add a control from another handler to this handler */
2204 struct v4l2_ctrl *v4l2_ctrl_add_ctrl(struct v4l2_ctrl_handler *hdl,
2205 struct v4l2_ctrl *ctrl)
2206 {
2207 if (hdl == NULL || hdl->error)
2208 return NULL;
2209 if (ctrl == NULL) {
2210 handler_set_err(hdl, -EINVAL);
2211 return NULL;
2212 }
2213 if (ctrl->handler == hdl)
2214 return ctrl;
2215 return handler_new_ref(hdl, ctrl) ? NULL : ctrl;
2216 }
2217 EXPORT_SYMBOL(v4l2_ctrl_add_ctrl);
2218
2219 /* Add the controls from another handler to our own. */
2220 int v4l2_ctrl_add_handler(struct v4l2_ctrl_handler *hdl,
2221 struct v4l2_ctrl_handler *add,
2222 bool (*filter)(const struct v4l2_ctrl *ctrl))
2223 {
2224 struct v4l2_ctrl_ref *ref;
2225 int ret = 0;
2226
2227 /* Do nothing if either handler is NULL or if they are the same */
2228 if (!hdl || !add || hdl == add)
2229 return 0;
2230 if (hdl->error)
2231 return hdl->error;
2232 mutex_lock(add->lock);
2233 list_for_each_entry(ref, &add->ctrl_refs, node) {
2234 struct v4l2_ctrl *ctrl = ref->ctrl;
2235
2236 /* Skip handler-private controls. */
2237 if (ctrl->is_private)
2238 continue;
2239 /* And control classes */
2240 if (ctrl->type == V4L2_CTRL_TYPE_CTRL_CLASS)
2241 continue;
2242 /* Filter any unwanted controls */
2243 if (filter && !filter(ctrl))
2244 continue;
2245 ret = handler_new_ref(hdl, ctrl);
2246 if (ret)
2247 break;
2248 }
2249 mutex_unlock(add->lock);
2250 return ret;
2251 }
2252 EXPORT_SYMBOL(v4l2_ctrl_add_handler);
2253
2254 bool v4l2_ctrl_radio_filter(const struct v4l2_ctrl *ctrl)
2255 {
2256 if (V4L2_CTRL_ID2CLASS(ctrl->id) == V4L2_CTRL_CLASS_FM_TX)
2257 return true;
2258 if (V4L2_CTRL_ID2CLASS(ctrl->id) == V4L2_CTRL_CLASS_FM_RX)
2259 return true;
2260 switch (ctrl->id) {
2261 case V4L2_CID_AUDIO_MUTE:
2262 case V4L2_CID_AUDIO_VOLUME:
2263 case V4L2_CID_AUDIO_BALANCE:
2264 case V4L2_CID_AUDIO_BASS:
2265 case V4L2_CID_AUDIO_TREBLE:
2266 case V4L2_CID_AUDIO_LOUDNESS:
2267 return true;
2268 default:
2269 break;
2270 }
2271 return false;
2272 }
2273 EXPORT_SYMBOL(v4l2_ctrl_radio_filter);
2274
2275 /* Cluster controls */
2276 void v4l2_ctrl_cluster(unsigned ncontrols, struct v4l2_ctrl **controls)
2277 {
2278 bool has_volatiles = false;
2279 int i;
2280
2281 /* The first control is the master control and it must not be NULL */
2282 if (WARN_ON(ncontrols == 0 || controls[0] == NULL))
2283 return;
2284
2285 for (i = 0; i < ncontrols; i++) {
2286 if (controls[i]) {
2287 controls[i]->cluster = controls;
2288 controls[i]->ncontrols = ncontrols;
2289 if (controls[i]->flags & V4L2_CTRL_FLAG_VOLATILE)
2290 has_volatiles = true;
2291 }
2292 }
2293 controls[0]->has_volatiles = has_volatiles;
2294 }
2295 EXPORT_SYMBOL(v4l2_ctrl_cluster);
2296
2297 void v4l2_ctrl_auto_cluster(unsigned ncontrols, struct v4l2_ctrl **controls,
2298 u8 manual_val, bool set_volatile)
2299 {
2300 struct v4l2_ctrl *master = controls[0];
2301 u32 flag = 0;
2302 int i;
2303
2304 v4l2_ctrl_cluster(ncontrols, controls);
2305 WARN_ON(ncontrols <= 1);
2306 WARN_ON(manual_val < master->minimum || manual_val > master->maximum);
2307 WARN_ON(set_volatile && !has_op(master, g_volatile_ctrl));
2308 master->is_auto = true;
2309 master->has_volatiles = set_volatile;
2310 master->manual_mode_value = manual_val;
2311 master->flags |= V4L2_CTRL_FLAG_UPDATE;
2312
2313 if (!is_cur_manual(master))
2314 flag = V4L2_CTRL_FLAG_INACTIVE |
2315 (set_volatile ? V4L2_CTRL_FLAG_VOLATILE : 0);
2316
2317 for (i = 1; i < ncontrols; i++)
2318 if (controls[i])
2319 controls[i]->flags |= flag;
2320 }
2321 EXPORT_SYMBOL(v4l2_ctrl_auto_cluster);
2322
2323 /* Activate/deactivate a control. */
2324 void v4l2_ctrl_activate(struct v4l2_ctrl *ctrl, bool active)
2325 {
2326 /* invert since the actual flag is called 'inactive' */
2327 bool inactive = !active;
2328 bool old;
2329
2330 if (ctrl == NULL)
2331 return;
2332
2333 if (inactive)
2334 /* set V4L2_CTRL_FLAG_INACTIVE */
2335 old = test_and_set_bit(4, &ctrl->flags);
2336 else
2337 /* clear V4L2_CTRL_FLAG_INACTIVE */
2338 old = test_and_clear_bit(4, &ctrl->flags);
2339 if (old != inactive)
2340 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_FLAGS);
2341 }
2342 EXPORT_SYMBOL(v4l2_ctrl_activate);
2343
2344 /* Grab/ungrab a control.
2345 Typically used when streaming starts and you want to grab controls,
2346 preventing the user from changing them.
2347
2348 Just call this and the framework will block any attempts to change
2349 these controls. */
2350 void v4l2_ctrl_grab(struct v4l2_ctrl *ctrl, bool grabbed)
2351 {
2352 bool old;
2353
2354 if (ctrl == NULL)
2355 return;
2356
2357 v4l2_ctrl_lock(ctrl);
2358 if (grabbed)
2359 /* set V4L2_CTRL_FLAG_GRABBED */
2360 old = test_and_set_bit(1, &ctrl->flags);
2361 else
2362 /* clear V4L2_CTRL_FLAG_GRABBED */
2363 old = test_and_clear_bit(1, &ctrl->flags);
2364 if (old != grabbed)
2365 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_FLAGS);
2366 v4l2_ctrl_unlock(ctrl);
2367 }
2368 EXPORT_SYMBOL(v4l2_ctrl_grab);
2369
2370 /* Log the control name and value */
2371 static void log_ctrl(const struct v4l2_ctrl *ctrl,
2372 const char *prefix, const char *colon)
2373 {
2374 if (ctrl->flags & (V4L2_CTRL_FLAG_DISABLED | V4L2_CTRL_FLAG_WRITE_ONLY))
2375 return;
2376 if (ctrl->type == V4L2_CTRL_TYPE_CTRL_CLASS)
2377 return;
2378
2379 pr_info("%s%s%s: ", prefix, colon, ctrl->name);
2380
2381 ctrl->type_ops->log(ctrl);
2382
2383 if (ctrl->flags & (V4L2_CTRL_FLAG_INACTIVE |
2384 V4L2_CTRL_FLAG_GRABBED |
2385 V4L2_CTRL_FLAG_VOLATILE)) {
2386 if (ctrl->flags & V4L2_CTRL_FLAG_INACTIVE)
2387 pr_cont(" inactive");
2388 if (ctrl->flags & V4L2_CTRL_FLAG_GRABBED)
2389 pr_cont(" grabbed");
2390 if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE)
2391 pr_cont(" volatile");
2392 }
2393 pr_cont("\n");
2394 }
2395
2396 /* Log all controls owned by the handler */
2397 void v4l2_ctrl_handler_log_status(struct v4l2_ctrl_handler *hdl,
2398 const char *prefix)
2399 {
2400 struct v4l2_ctrl *ctrl;
2401 const char *colon = "";
2402 int len;
2403
2404 if (hdl == NULL)
2405 return;
2406 if (prefix == NULL)
2407 prefix = "";
2408 len = strlen(prefix);
2409 if (len && prefix[len - 1] != ' ')
2410 colon = ": ";
2411 mutex_lock(hdl->lock);
2412 list_for_each_entry(ctrl, &hdl->ctrls, node)
2413 if (!(ctrl->flags & V4L2_CTRL_FLAG_DISABLED))
2414 log_ctrl(ctrl, prefix, colon);
2415 mutex_unlock(hdl->lock);
2416 }
2417 EXPORT_SYMBOL(v4l2_ctrl_handler_log_status);
2418
2419 int v4l2_ctrl_subdev_log_status(struct v4l2_subdev *sd)
2420 {
2421 v4l2_ctrl_handler_log_status(sd->ctrl_handler, sd->name);
2422 return 0;
2423 }
2424 EXPORT_SYMBOL(v4l2_ctrl_subdev_log_status);
2425
2426 /* Call s_ctrl for all controls owned by the handler */
2427 int v4l2_ctrl_handler_setup(struct v4l2_ctrl_handler *hdl)
2428 {
2429 struct v4l2_ctrl *ctrl;
2430 int ret = 0;
2431
2432 if (hdl == NULL)
2433 return 0;
2434 mutex_lock(hdl->lock);
2435 list_for_each_entry(ctrl, &hdl->ctrls, node)
2436 ctrl->done = false;
2437
2438 list_for_each_entry(ctrl, &hdl->ctrls, node) {
2439 struct v4l2_ctrl *master = ctrl->cluster[0];
2440 int i;
2441
2442 /* Skip if this control was already handled by a cluster. */
2443 /* Skip button controls and read-only controls. */
2444 if (ctrl->done || ctrl->type == V4L2_CTRL_TYPE_BUTTON ||
2445 (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY))
2446 continue;
2447
2448 for (i = 0; i < master->ncontrols; i++) {
2449 if (master->cluster[i]) {
2450 cur_to_new(master->cluster[i]);
2451 master->cluster[i]->is_new = 1;
2452 master->cluster[i]->done = true;
2453 }
2454 }
2455 ret = call_op(master, s_ctrl);
2456 if (ret)
2457 break;
2458 }
2459 mutex_unlock(hdl->lock);
2460 return ret;
2461 }
2462 EXPORT_SYMBOL(v4l2_ctrl_handler_setup);
2463
2464 /* Implement VIDIOC_QUERY_EXT_CTRL */
2465 int v4l2_query_ext_ctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_query_ext_ctrl *qc)
2466 {
2467 const unsigned next_flags = V4L2_CTRL_FLAG_NEXT_CTRL | V4L2_CTRL_FLAG_NEXT_COMPOUND;
2468 u32 id = qc->id & V4L2_CTRL_ID_MASK;
2469 struct v4l2_ctrl_ref *ref;
2470 struct v4l2_ctrl *ctrl;
2471
2472 if (hdl == NULL)
2473 return -EINVAL;
2474
2475 mutex_lock(hdl->lock);
2476
2477 /* Try to find it */
2478 ref = find_ref(hdl, id);
2479
2480 if ((qc->id & next_flags) && !list_empty(&hdl->ctrl_refs)) {
2481 bool is_compound;
2482 /* Match any control that is not hidden */
2483 unsigned mask = 1;
2484 bool match = false;
2485
2486 if ((qc->id & next_flags) == V4L2_CTRL_FLAG_NEXT_COMPOUND) {
2487 /* Match any hidden control */
2488 match = true;
2489 } else if ((qc->id & next_flags) == next_flags) {
2490 /* Match any control, compound or not */
2491 mask = 0;
2492 }
2493
2494 /* Find the next control with ID > qc->id */
2495
2496 /* Did we reach the end of the control list? */
2497 if (id >= node2id(hdl->ctrl_refs.prev)) {
2498 ref = NULL; /* Yes, so there is no next control */
2499 } else if (ref) {
2500 /* We found a control with the given ID, so just get
2501 the next valid one in the list. */
2502 list_for_each_entry_continue(ref, &hdl->ctrl_refs, node) {
2503 is_compound = ref->ctrl->is_array ||
2504 ref->ctrl->type >= V4L2_CTRL_COMPOUND_TYPES;
2505 if (id < ref->ctrl->id &&
2506 (is_compound & mask) == match)
2507 break;
2508 }
2509 if (&ref->node == &hdl->ctrl_refs)
2510 ref = NULL;
2511 } else {
2512 /* No control with the given ID exists, so start
2513 searching for the next largest ID. We know there
2514 is one, otherwise the first 'if' above would have
2515 been true. */
2516 list_for_each_entry(ref, &hdl->ctrl_refs, node) {
2517 is_compound = ref->ctrl->is_array ||
2518 ref->ctrl->type >= V4L2_CTRL_COMPOUND_TYPES;
2519 if (id < ref->ctrl->id &&
2520 (is_compound & mask) == match)
2521 break;
2522 }
2523 if (&ref->node == &hdl->ctrl_refs)
2524 ref = NULL;
2525 }
2526 }
2527 mutex_unlock(hdl->lock);
2528
2529 if (!ref)
2530 return -EINVAL;
2531
2532 ctrl = ref->ctrl;
2533 memset(qc, 0, sizeof(*qc));
2534 if (id >= V4L2_CID_PRIVATE_BASE)
2535 qc->id = id;
2536 else
2537 qc->id = ctrl->id;
2538 strlcpy(qc->name, ctrl->name, sizeof(qc->name));
2539 qc->flags = ctrl->flags;
2540 qc->type = ctrl->type;
2541 if (ctrl->is_ptr)
2542 qc->flags |= V4L2_CTRL_FLAG_HAS_PAYLOAD;
2543 qc->elem_size = ctrl->elem_size;
2544 qc->elems = ctrl->elems;
2545 qc->nr_of_dims = ctrl->nr_of_dims;
2546 memcpy(qc->dims, ctrl->dims, qc->nr_of_dims * sizeof(qc->dims[0]));
2547 qc->minimum = ctrl->minimum;
2548 qc->maximum = ctrl->maximum;
2549 qc->default_value = ctrl->default_value;
2550 if (ctrl->type == V4L2_CTRL_TYPE_MENU
2551 || ctrl->type == V4L2_CTRL_TYPE_INTEGER_MENU)
2552 qc->step = 1;
2553 else
2554 qc->step = ctrl->step;
2555 return 0;
2556 }
2557 EXPORT_SYMBOL(v4l2_query_ext_ctrl);
2558
2559 /* Implement VIDIOC_QUERYCTRL */
2560 int v4l2_queryctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_queryctrl *qc)
2561 {
2562 struct v4l2_query_ext_ctrl qec = { qc->id };
2563 int rc;
2564
2565 rc = v4l2_query_ext_ctrl(hdl, &qec);
2566 if (rc)
2567 return rc;
2568
2569 qc->id = qec.id;
2570 qc->type = qec.type;
2571 qc->flags = qec.flags;
2572 strlcpy(qc->name, qec.name, sizeof(qc->name));
2573 switch (qc->type) {
2574 case V4L2_CTRL_TYPE_INTEGER:
2575 case V4L2_CTRL_TYPE_BOOLEAN:
2576 case V4L2_CTRL_TYPE_MENU:
2577 case V4L2_CTRL_TYPE_INTEGER_MENU:
2578 case V4L2_CTRL_TYPE_STRING:
2579 case V4L2_CTRL_TYPE_BITMASK:
2580 qc->minimum = qec.minimum;
2581 qc->maximum = qec.maximum;
2582 qc->step = qec.step;
2583 qc->default_value = qec.default_value;
2584 break;
2585 default:
2586 qc->minimum = 0;
2587 qc->maximum = 0;
2588 qc->step = 0;
2589 qc->default_value = 0;
2590 break;
2591 }
2592 return 0;
2593 }
2594 EXPORT_SYMBOL(v4l2_queryctrl);
2595
2596 int v4l2_subdev_queryctrl(struct v4l2_subdev *sd, struct v4l2_queryctrl *qc)
2597 {
2598 if (qc->id & (V4L2_CTRL_FLAG_NEXT_CTRL | V4L2_CTRL_FLAG_NEXT_COMPOUND))
2599 return -EINVAL;
2600 return v4l2_queryctrl(sd->ctrl_handler, qc);
2601 }
2602 EXPORT_SYMBOL(v4l2_subdev_queryctrl);
2603
2604 /* Implement VIDIOC_QUERYMENU */
2605 int v4l2_querymenu(struct v4l2_ctrl_handler *hdl, struct v4l2_querymenu *qm)
2606 {
2607 struct v4l2_ctrl *ctrl;
2608 u32 i = qm->index;
2609
2610 ctrl = v4l2_ctrl_find(hdl, qm->id);
2611 if (!ctrl)
2612 return -EINVAL;
2613
2614 qm->reserved = 0;
2615 /* Sanity checks */
2616 switch (ctrl->type) {
2617 case V4L2_CTRL_TYPE_MENU:
2618 if (ctrl->qmenu == NULL)
2619 return -EINVAL;
2620 break;
2621 case V4L2_CTRL_TYPE_INTEGER_MENU:
2622 if (ctrl->qmenu_int == NULL)
2623 return -EINVAL;
2624 break;
2625 default:
2626 return -EINVAL;
2627 }
2628
2629 if (i < ctrl->minimum || i > ctrl->maximum)
2630 return -EINVAL;
2631
2632 /* Use mask to see if this menu item should be skipped */
2633 if (ctrl->menu_skip_mask & (1 << i))
2634 return -EINVAL;
2635 /* Empty menu items should also be skipped */
2636 if (ctrl->type == V4L2_CTRL_TYPE_MENU) {
2637 if (ctrl->qmenu[i] == NULL || ctrl->qmenu[i][0] == '\0')
2638 return -EINVAL;
2639 strlcpy(qm->name, ctrl->qmenu[i], sizeof(qm->name));
2640 } else {
2641 qm->value = ctrl->qmenu_int[i];
2642 }
2643 return 0;
2644 }
2645 EXPORT_SYMBOL(v4l2_querymenu);
2646
2647 int v4l2_subdev_querymenu(struct v4l2_subdev *sd, struct v4l2_querymenu *qm)
2648 {
2649 return v4l2_querymenu(sd->ctrl_handler, qm);
2650 }
2651 EXPORT_SYMBOL(v4l2_subdev_querymenu);
2652
2653
2654
2655 /* Some general notes on the atomic requirements of VIDIOC_G/TRY/S_EXT_CTRLS:
2656
2657 It is not a fully atomic operation, just best-effort only. After all, if
2658 multiple controls have to be set through multiple i2c writes (for example)
2659 then some initial writes may succeed while others fail. Thus leaving the
2660 system in an inconsistent state. The question is how much effort you are
2661 willing to spend on trying to make something atomic that really isn't.
2662
2663 From the point of view of an application the main requirement is that
2664 when you call VIDIOC_S_EXT_CTRLS and some values are invalid then an
2665 error should be returned without actually affecting any controls.
2666
2667 If all the values are correct, then it is acceptable to just give up
2668 in case of low-level errors.
2669
2670 It is important though that the application can tell when only a partial
2671 configuration was done. The way we do that is through the error_idx field
2672 of struct v4l2_ext_controls: if that is equal to the count field then no
2673 controls were affected. Otherwise all controls before that index were
2674 successful in performing their 'get' or 'set' operation, the control at
2675 the given index failed, and you don't know what happened with the controls
2676 after the failed one. Since if they were part of a control cluster they
2677 could have been successfully processed (if a cluster member was encountered
2678 at index < error_idx), they could have failed (if a cluster member was at
2679 error_idx), or they may not have been processed yet (if the first cluster
2680 member appeared after error_idx).
2681
2682 It is all fairly theoretical, though. In practice all you can do is to
2683 bail out. If error_idx == count, then it is an application bug. If
2684 error_idx < count then it is only an application bug if the error code was
2685 EBUSY. That usually means that something started streaming just when you
2686 tried to set the controls. In all other cases it is a driver/hardware
2687 problem and all you can do is to retry or bail out.
2688
2689 Note that these rules do not apply to VIDIOC_TRY_EXT_CTRLS: since that
2690 never modifies controls the error_idx is just set to whatever control
2691 has an invalid value.
2692 */
2693
2694 /* Prepare for the extended g/s/try functions.
2695 Find the controls in the control array and do some basic checks. */
2696 static int prepare_ext_ctrls(struct v4l2_ctrl_handler *hdl,
2697 struct v4l2_ext_controls *cs,
2698 struct v4l2_ctrl_helper *helpers,
2699 bool get)
2700 {
2701 struct v4l2_ctrl_helper *h;
2702 bool have_clusters = false;
2703 u32 i;
2704
2705 for (i = 0, h = helpers; i < cs->count; i++, h++) {
2706 struct v4l2_ext_control *c = &cs->controls[i];
2707 struct v4l2_ctrl_ref *ref;
2708 struct v4l2_ctrl *ctrl;
2709 u32 id = c->id & V4L2_CTRL_ID_MASK;
2710
2711 cs->error_idx = i;
2712
2713 if (cs->ctrl_class && V4L2_CTRL_ID2CLASS(id) != cs->ctrl_class)
2714 return -EINVAL;
2715
2716 /* Old-style private controls are not allowed for
2717 extended controls */
2718 if (id >= V4L2_CID_PRIVATE_BASE)
2719 return -EINVAL;
2720 ref = find_ref_lock(hdl, id);
2721 if (ref == NULL)
2722 return -EINVAL;
2723 ctrl = ref->ctrl;
2724 if (ctrl->flags & V4L2_CTRL_FLAG_DISABLED)
2725 return -EINVAL;
2726
2727 if (ctrl->cluster[0]->ncontrols > 1)
2728 have_clusters = true;
2729 if (ctrl->cluster[0] != ctrl)
2730 ref = find_ref_lock(hdl, ctrl->cluster[0]->id);
2731 if (ctrl->is_ptr && !ctrl->is_string) {
2732 unsigned tot_size = ctrl->elems * ctrl->elem_size;
2733
2734 if (c->size < tot_size) {
2735 if (get) {
2736 c->size = tot_size;
2737 return -ENOSPC;
2738 }
2739 return -EFAULT;
2740 }
2741 c->size = tot_size;
2742 }
2743 /* Store the ref to the master control of the cluster */
2744 h->mref = ref;
2745 h->ctrl = ctrl;
2746 /* Initially set next to 0, meaning that there is no other
2747 control in this helper array belonging to the same
2748 cluster */
2749 h->next = 0;
2750 }
2751
2752 /* We are done if there were no controls that belong to a multi-
2753 control cluster. */
2754 if (!have_clusters)
2755 return 0;
2756
2757 /* The code below figures out in O(n) time which controls in the list
2758 belong to the same cluster. */
2759
2760 /* This has to be done with the handler lock taken. */
2761 mutex_lock(hdl->lock);
2762
2763 /* First zero the helper field in the master control references */
2764 for (i = 0; i < cs->count; i++)
2765 helpers[i].mref->helper = NULL;
2766 for (i = 0, h = helpers; i < cs->count; i++, h++) {
2767 struct v4l2_ctrl_ref *mref = h->mref;
2768
2769 /* If the mref->helper is set, then it points to an earlier
2770 helper that belongs to the same cluster. */
2771 if (mref->helper) {
2772 /* Set the next field of mref->helper to the current
2773 index: this means that that earlier helper now
2774 points to the next helper in the same cluster. */
2775 mref->helper->next = i;
2776 /* mref should be set only for the first helper in the
2777 cluster, clear the others. */
2778 h->mref = NULL;
2779 }
2780 /* Point the mref helper to the current helper struct. */
2781 mref->helper = h;
2782 }
2783 mutex_unlock(hdl->lock);
2784 return 0;
2785 }
2786
2787 /* Handles the corner case where cs->count == 0. It checks whether the
2788 specified control class exists. If that class ID is 0, then it checks
2789 whether there are any controls at all. */
2790 static int class_check(struct v4l2_ctrl_handler *hdl, u32 ctrl_class)
2791 {
2792 if (ctrl_class == 0)
2793 return list_empty(&hdl->ctrl_refs) ? -EINVAL : 0;
2794 return find_ref_lock(hdl, ctrl_class | 1) ? 0 : -EINVAL;
2795 }
2796
2797
2798
2799 /* Get extended controls. Allocates the helpers array if needed. */
2800 int v4l2_g_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *cs)
2801 {
2802 struct v4l2_ctrl_helper helper[4];
2803 struct v4l2_ctrl_helper *helpers = helper;
2804 int ret;
2805 int i, j;
2806
2807 cs->error_idx = cs->count;
2808 cs->ctrl_class = V4L2_CTRL_ID2CLASS(cs->ctrl_class);
2809
2810 if (hdl == NULL)
2811 return -EINVAL;
2812
2813 if (cs->count == 0)
2814 return class_check(hdl, cs->ctrl_class);
2815
2816 if (cs->count > ARRAY_SIZE(helper)) {
2817 helpers = kmalloc_array(cs->count, sizeof(helper[0]),
2818 GFP_KERNEL);
2819 if (helpers == NULL)
2820 return -ENOMEM;
2821 }
2822
2823 ret = prepare_ext_ctrls(hdl, cs, helpers, true);
2824 cs->error_idx = cs->count;
2825
2826 for (i = 0; !ret && i < cs->count; i++)
2827 if (helpers[i].ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY)
2828 ret = -EACCES;
2829
2830 for (i = 0; !ret && i < cs->count; i++) {
2831 int (*ctrl_to_user)(struct v4l2_ext_control *c,
2832 struct v4l2_ctrl *ctrl) = cur_to_user;
2833 struct v4l2_ctrl *master;
2834
2835 if (helpers[i].mref == NULL)
2836 continue;
2837
2838 master = helpers[i].mref->ctrl;
2839 cs->error_idx = i;
2840
2841 v4l2_ctrl_lock(master);
2842
2843 /* g_volatile_ctrl will update the new control values */
2844 if ((master->flags & V4L2_CTRL_FLAG_VOLATILE) ||
2845 (master->has_volatiles && !is_cur_manual(master))) {
2846 for (j = 0; j < master->ncontrols; j++)
2847 cur_to_new(master->cluster[j]);
2848 ret = call_op(master, g_volatile_ctrl);
2849 ctrl_to_user = new_to_user;
2850 }
2851 /* If OK, then copy the current (for non-volatile controls)
2852 or the new (for volatile controls) control values to the
2853 caller */
2854 if (!ret) {
2855 u32 idx = i;
2856
2857 do {
2858 ret = ctrl_to_user(cs->controls + idx,
2859 helpers[idx].ctrl);
2860 idx = helpers[idx].next;
2861 } while (!ret && idx);
2862 }
2863 v4l2_ctrl_unlock(master);
2864 }
2865
2866 if (cs->count > ARRAY_SIZE(helper))
2867 kfree(helpers);
2868 return ret;
2869 }
2870 EXPORT_SYMBOL(v4l2_g_ext_ctrls);
2871
2872 int v4l2_subdev_g_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs)
2873 {
2874 return v4l2_g_ext_ctrls(sd->ctrl_handler, cs);
2875 }
2876 EXPORT_SYMBOL(v4l2_subdev_g_ext_ctrls);
2877
2878 /* Helper function to get a single control */
2879 static int get_ctrl(struct v4l2_ctrl *ctrl, struct v4l2_ext_control *c)
2880 {
2881 struct v4l2_ctrl *master = ctrl->cluster[0];
2882 int ret = 0;
2883 int i;
2884
2885 /* Compound controls are not supported. The new_to_user() and
2886 * cur_to_user() calls below would need to be modified not to access
2887 * userspace memory when called from get_ctrl().
2888 */
2889 if (!ctrl->is_int && ctrl->type != V4L2_CTRL_TYPE_INTEGER64)
2890 return -EINVAL;
2891
2892 if (ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY)
2893 return -EACCES;
2894
2895 v4l2_ctrl_lock(master);
2896 /* g_volatile_ctrl will update the current control values */
2897 if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE) {
2898 for (i = 0; i < master->ncontrols; i++)
2899 cur_to_new(master->cluster[i]);
2900 ret = call_op(master, g_volatile_ctrl);
2901 new_to_user(c, ctrl);
2902 } else {
2903 cur_to_user(c, ctrl);
2904 }
2905 v4l2_ctrl_unlock(master);
2906 return ret;
2907 }
2908
2909 int v4l2_g_ctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_control *control)
2910 {
2911 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, control->id);
2912 struct v4l2_ext_control c;
2913 int ret;
2914
2915 if (ctrl == NULL || !ctrl->is_int)
2916 return -EINVAL;
2917 ret = get_ctrl(ctrl, &c);
2918 control->value = c.value;
2919 return ret;
2920 }
2921 EXPORT_SYMBOL(v4l2_g_ctrl);
2922
2923 int v4l2_subdev_g_ctrl(struct v4l2_subdev *sd, struct v4l2_control *control)
2924 {
2925 return v4l2_g_ctrl(sd->ctrl_handler, control);
2926 }
2927 EXPORT_SYMBOL(v4l2_subdev_g_ctrl);
2928
2929 s32 v4l2_ctrl_g_ctrl(struct v4l2_ctrl *ctrl)
2930 {
2931 struct v4l2_ext_control c;
2932
2933 /* It's a driver bug if this happens. */
2934 WARN_ON(!ctrl->is_int);
2935 c.value = 0;
2936 get_ctrl(ctrl, &c);
2937 return c.value;
2938 }
2939 EXPORT_SYMBOL(v4l2_ctrl_g_ctrl);
2940
2941 s64 v4l2_ctrl_g_ctrl_int64(struct v4l2_ctrl *ctrl)
2942 {
2943 struct v4l2_ext_control c;
2944
2945 /* It's a driver bug if this happens. */
2946 WARN_ON(ctrl->is_ptr || ctrl->type != V4L2_CTRL_TYPE_INTEGER64);
2947 c.value64 = 0;
2948 get_ctrl(ctrl, &c);
2949 return c.value64;
2950 }
2951 EXPORT_SYMBOL(v4l2_ctrl_g_ctrl_int64);
2952
2953
2954 /* Core function that calls try/s_ctrl and ensures that the new value is
2955 copied to the current value on a set.
2956 Must be called with ctrl->handler->lock held. */
2957 static int try_or_set_cluster(struct v4l2_fh *fh, struct v4l2_ctrl *master,
2958 bool set, u32 ch_flags)
2959 {
2960 bool update_flag;
2961 int ret;
2962 int i;
2963
2964 /* Go through the cluster and either validate the new value or
2965 (if no new value was set), copy the current value to the new
2966 value, ensuring a consistent view for the control ops when
2967 called. */
2968 for (i = 0; i < master->ncontrols; i++) {
2969 struct v4l2_ctrl *ctrl = master->cluster[i];
2970
2971 if (ctrl == NULL)
2972 continue;
2973
2974 if (!ctrl->is_new) {
2975 cur_to_new(ctrl);
2976 continue;
2977 }
2978 /* Check again: it may have changed since the
2979 previous check in try_or_set_ext_ctrls(). */
2980 if (set && (ctrl->flags & V4L2_CTRL_FLAG_GRABBED))
2981 return -EBUSY;
2982 }
2983
2984 ret = call_op(master, try_ctrl);
2985
2986 /* Don't set if there is no change */
2987 if (ret || !set || !cluster_changed(master))
2988 return ret;
2989 ret = call_op(master, s_ctrl);
2990 if (ret)
2991 return ret;
2992
2993 /* If OK, then make the new values permanent. */
2994 update_flag = is_cur_manual(master) != is_new_manual(master);
2995 for (i = 0; i < master->ncontrols; i++)
2996 new_to_cur(fh, master->cluster[i], ch_flags |
2997 ((update_flag && i > 0) ? V4L2_EVENT_CTRL_CH_FLAGS : 0));
2998 return 0;
2999 }
3000
3001 /* Validate controls. */
3002 static int validate_ctrls(struct v4l2_ext_controls *cs,
3003 struct v4l2_ctrl_helper *helpers, bool set)
3004 {
3005 unsigned i;
3006 int ret = 0;
3007
3008 cs->error_idx = cs->count;
3009 for (i = 0; i < cs->count; i++) {
3010 struct v4l2_ctrl *ctrl = helpers[i].ctrl;
3011 union v4l2_ctrl_ptr p_new;
3012
3013 cs->error_idx = i;
3014
3015 if (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY)
3016 return -EACCES;
3017 /* This test is also done in try_set_control_cluster() which
3018 is called in atomic context, so that has the final say,
3019 but it makes sense to do an up-front check as well. Once
3020 an error occurs in try_set_control_cluster() some other
3021 controls may have been set already and we want to do a
3022 best-effort to avoid that. */
3023 if (set && (ctrl->flags & V4L2_CTRL_FLAG_GRABBED))
3024 return -EBUSY;
3025 /*
3026 * Skip validation for now if the payload needs to be copied
3027 * from userspace into kernelspace. We'll validate those later.
3028 */
3029 if (ctrl->is_ptr)
3030 continue;
3031 if (ctrl->type == V4L2_CTRL_TYPE_INTEGER64)
3032 p_new.p_s64 = &cs->controls[i].value64;
3033 else
3034 p_new.p_s32 = &cs->controls[i].value;
3035 ret = validate_new(ctrl, p_new);
3036 if (ret)
3037 return ret;
3038 }
3039 return 0;
3040 }
3041
3042 /* Obtain the current volatile values of an autocluster and mark them
3043 as new. */
3044 static void update_from_auto_cluster(struct v4l2_ctrl *master)
3045 {
3046 int i;
3047
3048 for (i = 1; i < master->ncontrols; i++)
3049 cur_to_new(master->cluster[i]);
3050 if (!call_op(master, g_volatile_ctrl))
3051 for (i = 1; i < master->ncontrols; i++)
3052 if (master->cluster[i])
3053 master->cluster[i]->is_new = 1;
3054 }
3055
3056 /* Try or try-and-set controls */
3057 static int try_set_ext_ctrls(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
3058 struct v4l2_ext_controls *cs,
3059 bool set)
3060 {
3061 struct v4l2_ctrl_helper helper[4];
3062 struct v4l2_ctrl_helper *helpers = helper;
3063 unsigned i, j;
3064 int ret;
3065
3066 cs->error_idx = cs->count;
3067 cs->ctrl_class = V4L2_CTRL_ID2CLASS(cs->ctrl_class);
3068
3069 if (hdl == NULL)
3070 return -EINVAL;
3071
3072 if (cs->count == 0)
3073 return class_check(hdl, cs->ctrl_class);
3074
3075 if (cs->count > ARRAY_SIZE(helper)) {
3076 helpers = kmalloc_array(cs->count, sizeof(helper[0]),
3077 GFP_KERNEL);
3078 if (!helpers)
3079 return -ENOMEM;
3080 }
3081 ret = prepare_ext_ctrls(hdl, cs, helpers, false);
3082 if (!ret)
3083 ret = validate_ctrls(cs, helpers, set);
3084 if (ret && set)
3085 cs->error_idx = cs->count;
3086 for (i = 0; !ret && i < cs->count; i++) {
3087 struct v4l2_ctrl *master;
3088 u32 idx = i;
3089
3090 if (helpers[i].mref == NULL)
3091 continue;
3092
3093 cs->error_idx = i;
3094 master = helpers[i].mref->ctrl;
3095 v4l2_ctrl_lock(master);
3096
3097 /* Reset the 'is_new' flags of the cluster */
3098 for (j = 0; j < master->ncontrols; j++)
3099 if (master->cluster[j])
3100 master->cluster[j]->is_new = 0;
3101
3102 /* For volatile autoclusters that are currently in auto mode
3103 we need to discover if it will be set to manual mode.
3104 If so, then we have to copy the current volatile values
3105 first since those will become the new manual values (which
3106 may be overwritten by explicit new values from this set
3107 of controls). */
3108 if (master->is_auto && master->has_volatiles &&
3109 !is_cur_manual(master)) {
3110 /* Pick an initial non-manual value */
3111 s32 new_auto_val = master->manual_mode_value + 1;
3112 u32 tmp_idx = idx;
3113
3114 do {
3115 /* Check if the auto control is part of the
3116 list, and remember the new value. */
3117 if (helpers[tmp_idx].ctrl == master)
3118 new_auto_val = cs->controls[tmp_idx].value;
3119 tmp_idx = helpers[tmp_idx].next;
3120 } while (tmp_idx);
3121 /* If the new value == the manual value, then copy
3122 the current volatile values. */
3123 if (new_auto_val == master->manual_mode_value)
3124 update_from_auto_cluster(master);
3125 }
3126
3127 /* Copy the new caller-supplied control values.
3128 user_to_new() sets 'is_new' to 1. */
3129 do {
3130 struct v4l2_ctrl *ctrl = helpers[idx].ctrl;
3131
3132 ret = user_to_new(cs->controls + idx, ctrl);
3133 if (!ret && ctrl->is_ptr)
3134 ret = validate_new(ctrl, ctrl->p_new);
3135 idx = helpers[idx].next;
3136 } while (!ret && idx);
3137
3138 if (!ret)
3139 ret = try_or_set_cluster(fh, master, set, 0);
3140
3141 /* Copy the new values back to userspace. */
3142 if (!ret) {
3143 idx = i;
3144 do {
3145 ret = new_to_user(cs->controls + idx,
3146 helpers[idx].ctrl);
3147 idx = helpers[idx].next;
3148 } while (!ret && idx);
3149 }
3150 v4l2_ctrl_unlock(master);
3151 }
3152
3153 if (cs->count > ARRAY_SIZE(helper))
3154 kfree(helpers);
3155 return ret;
3156 }
3157
3158 int v4l2_try_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *cs)
3159 {
3160 return try_set_ext_ctrls(NULL, hdl, cs, false);
3161 }
3162 EXPORT_SYMBOL(v4l2_try_ext_ctrls);
3163
3164 int v4l2_s_ext_ctrls(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
3165 struct v4l2_ext_controls *cs)
3166 {
3167 return try_set_ext_ctrls(fh, hdl, cs, true);
3168 }
3169 EXPORT_SYMBOL(v4l2_s_ext_ctrls);
3170
3171 int v4l2_subdev_try_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs)
3172 {
3173 return try_set_ext_ctrls(NULL, sd->ctrl_handler, cs, false);
3174 }
3175 EXPORT_SYMBOL(v4l2_subdev_try_ext_ctrls);
3176
3177 int v4l2_subdev_s_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs)
3178 {
3179 return try_set_ext_ctrls(NULL, sd->ctrl_handler, cs, true);
3180 }
3181 EXPORT_SYMBOL(v4l2_subdev_s_ext_ctrls);
3182
3183 /* Helper function for VIDIOC_S_CTRL compatibility */
3184 static int set_ctrl(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, u32 ch_flags)
3185 {
3186 struct v4l2_ctrl *master = ctrl->cluster[0];
3187 int ret;
3188 int i;
3189
3190 /* Reset the 'is_new' flags of the cluster */
3191 for (i = 0; i < master->ncontrols; i++)
3192 if (master->cluster[i])
3193 master->cluster[i]->is_new = 0;
3194
3195 ret = validate_new(ctrl, ctrl->p_new);
3196 if (ret)
3197 return ret;
3198
3199 /* For autoclusters with volatiles that are switched from auto to
3200 manual mode we have to update the current volatile values since
3201 those will become the initial manual values after such a switch. */
3202 if (master->is_auto && master->has_volatiles && ctrl == master &&
3203 !is_cur_manual(master) && ctrl->val == master->manual_mode_value)
3204 update_from_auto_cluster(master);
3205
3206 ctrl->is_new = 1;
3207 return try_or_set_cluster(fh, master, true, ch_flags);
3208 }
3209
3210 /* Helper function for VIDIOC_S_CTRL compatibility */
3211 static int set_ctrl_lock(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl,
3212 struct v4l2_ext_control *c)
3213 {
3214 int ret;
3215
3216 v4l2_ctrl_lock(ctrl);
3217 user_to_new(c, ctrl);
3218 ret = set_ctrl(fh, ctrl, 0);
3219 if (!ret)
3220 cur_to_user(c, ctrl);
3221 v4l2_ctrl_unlock(ctrl);
3222 return ret;
3223 }
3224
3225 int v4l2_s_ctrl(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
3226 struct v4l2_control *control)
3227 {
3228 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, control->id);
3229 struct v4l2_ext_control c = { control->id };
3230 int ret;
3231
3232 if (ctrl == NULL || !ctrl->is_int)
3233 return -EINVAL;
3234
3235 if (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY)
3236 return -EACCES;
3237
3238 c.value = control->value;
3239 ret = set_ctrl_lock(fh, ctrl, &c);
3240 control->value = c.value;
3241 return ret;
3242 }
3243 EXPORT_SYMBOL(v4l2_s_ctrl);
3244
3245 int v4l2_subdev_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *control)
3246 {
3247 return v4l2_s_ctrl(NULL, sd->ctrl_handler, control);
3248 }
3249 EXPORT_SYMBOL(v4l2_subdev_s_ctrl);
3250
3251 int __v4l2_ctrl_s_ctrl(struct v4l2_ctrl *ctrl, s32 val)
3252 {
3253 lockdep_assert_held(ctrl->handler->lock);
3254
3255 /* It's a driver bug if this happens. */
3256 WARN_ON(!ctrl->is_int);
3257 ctrl->val = val;
3258 return set_ctrl(NULL, ctrl, 0);
3259 }
3260 EXPORT_SYMBOL(__v4l2_ctrl_s_ctrl);
3261
3262 int __v4l2_ctrl_s_ctrl_int64(struct v4l2_ctrl *ctrl, s64 val)
3263 {
3264 lockdep_assert_held(ctrl->handler->lock);
3265
3266 /* It's a driver bug if this happens. */
3267 WARN_ON(ctrl->is_ptr || ctrl->type != V4L2_CTRL_TYPE_INTEGER64);
3268 *ctrl->p_new.p_s64 = val;
3269 return set_ctrl(NULL, ctrl, 0);
3270 }
3271 EXPORT_SYMBOL(__v4l2_ctrl_s_ctrl_int64);
3272
3273 int __v4l2_ctrl_s_ctrl_string(struct v4l2_ctrl *ctrl, const char *s)
3274 {
3275 lockdep_assert_held(ctrl->handler->lock);
3276
3277 /* It's a driver bug if this happens. */
3278 WARN_ON(ctrl->type != V4L2_CTRL_TYPE_STRING);
3279 strlcpy(ctrl->p_new.p_char, s, ctrl->maximum + 1);
3280 return set_ctrl(NULL, ctrl, 0);
3281 }
3282 EXPORT_SYMBOL(__v4l2_ctrl_s_ctrl_string);
3283
3284 void v4l2_ctrl_notify(struct v4l2_ctrl *ctrl, v4l2_ctrl_notify_fnc notify, void *priv)
3285 {
3286 if (ctrl == NULL)
3287 return;
3288 if (notify == NULL) {
3289 ctrl->call_notify = 0;
3290 return;
3291 }
3292 if (WARN_ON(ctrl->handler->notify && ctrl->handler->notify != notify))
3293 return;
3294 ctrl->handler->notify = notify;
3295 ctrl->handler->notify_priv = priv;
3296 ctrl->call_notify = 1;
3297 }
3298 EXPORT_SYMBOL(v4l2_ctrl_notify);
3299
3300 int __v4l2_ctrl_modify_range(struct v4l2_ctrl *ctrl,
3301 s64 min, s64 max, u64 step, s64 def)
3302 {
3303 bool changed;
3304 int ret;
3305
3306 lockdep_assert_held(ctrl->handler->lock);
3307
3308 switch (ctrl->type) {
3309 case V4L2_CTRL_TYPE_INTEGER:
3310 case V4L2_CTRL_TYPE_INTEGER64:
3311 case V4L2_CTRL_TYPE_BOOLEAN:
3312 case V4L2_CTRL_TYPE_MENU:
3313 case V4L2_CTRL_TYPE_INTEGER_MENU:
3314 case V4L2_CTRL_TYPE_BITMASK:
3315 case V4L2_CTRL_TYPE_U8:
3316 case V4L2_CTRL_TYPE_U16:
3317 case V4L2_CTRL_TYPE_U32:
3318 if (ctrl->is_array)
3319 return -EINVAL;
3320 ret = check_range(ctrl->type, min, max, step, def);
3321 if (ret)
3322 return ret;
3323 break;
3324 default:
3325 return -EINVAL;
3326 }
3327 ctrl->minimum = min;
3328 ctrl->maximum = max;
3329 ctrl->step = step;
3330 ctrl->default_value = def;
3331 cur_to_new(ctrl);
3332 if (validate_new(ctrl, ctrl->p_new)) {
3333 if (ctrl->type == V4L2_CTRL_TYPE_INTEGER64)
3334 *ctrl->p_new.p_s64 = def;
3335 else
3336 *ctrl->p_new.p_s32 = def;
3337 }
3338
3339 if (ctrl->type == V4L2_CTRL_TYPE_INTEGER64)
3340 changed = *ctrl->p_new.p_s64 != *ctrl->p_cur.p_s64;
3341 else
3342 changed = *ctrl->p_new.p_s32 != *ctrl->p_cur.p_s32;
3343 if (changed)
3344 ret = set_ctrl(NULL, ctrl, V4L2_EVENT_CTRL_CH_RANGE);
3345 else
3346 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_RANGE);
3347 return ret;
3348 }
3349 EXPORT_SYMBOL(__v4l2_ctrl_modify_range);
3350
3351 static int v4l2_ctrl_add_event(struct v4l2_subscribed_event *sev, unsigned elems)
3352 {
3353 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(sev->fh->ctrl_handler, sev->id);
3354
3355 if (ctrl == NULL)
3356 return -EINVAL;
3357
3358 v4l2_ctrl_lock(ctrl);
3359 list_add_tail(&sev->node, &ctrl->ev_subs);
3360 if (ctrl->type != V4L2_CTRL_TYPE_CTRL_CLASS &&
3361 (sev->flags & V4L2_EVENT_SUB_FL_SEND_INITIAL)) {
3362 struct v4l2_event ev;
3363 u32 changes = V4L2_EVENT_CTRL_CH_FLAGS;
3364
3365 if (!(ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY))
3366 changes |= V4L2_EVENT_CTRL_CH_VALUE;
3367 fill_event(&ev, ctrl, changes);
3368 /* Mark the queue as active, allowing this initial
3369 event to be accepted. */
3370 sev->elems = elems;
3371 v4l2_event_queue_fh(sev->fh, &ev);
3372 }
3373 v4l2_ctrl_unlock(ctrl);
3374 return 0;
3375 }
3376
3377 static void v4l2_ctrl_del_event(struct v4l2_subscribed_event *sev)
3378 {
3379 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(sev->fh->ctrl_handler, sev->id);
3380
3381 v4l2_ctrl_lock(ctrl);
3382 list_del(&sev->node);
3383 v4l2_ctrl_unlock(ctrl);
3384 }
3385
3386 void v4l2_ctrl_replace(struct v4l2_event *old, const struct v4l2_event *new)
3387 {
3388 u32 old_changes = old->u.ctrl.changes;
3389
3390 old->u.ctrl = new->u.ctrl;
3391 old->u.ctrl.changes |= old_changes;
3392 }
3393 EXPORT_SYMBOL(v4l2_ctrl_replace);
3394
3395 void v4l2_ctrl_merge(const struct v4l2_event *old, struct v4l2_event *new)
3396 {
3397 new->u.ctrl.changes |= old->u.ctrl.changes;
3398 }
3399 EXPORT_SYMBOL(v4l2_ctrl_merge);
3400
3401 const struct v4l2_subscribed_event_ops v4l2_ctrl_sub_ev_ops = {
3402 .add = v4l2_ctrl_add_event,
3403 .del = v4l2_ctrl_del_event,
3404 .replace = v4l2_ctrl_replace,
3405 .merge = v4l2_ctrl_merge,
3406 };
3407 EXPORT_SYMBOL(v4l2_ctrl_sub_ev_ops);
3408
3409 int v4l2_ctrl_log_status(struct file *file, void *fh)
3410 {
3411 struct video_device *vfd = video_devdata(file);
3412 struct v4l2_fh *vfh = file->private_data;
3413
3414 if (test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags) && vfd->v4l2_dev)
3415 v4l2_ctrl_handler_log_status(vfh->ctrl_handler,
3416 vfd->v4l2_dev->name);
3417 return 0;
3418 }
3419 EXPORT_SYMBOL(v4l2_ctrl_log_status);
3420
3421 int v4l2_ctrl_subscribe_event(struct v4l2_fh *fh,
3422 const struct v4l2_event_subscription *sub)
3423 {
3424 if (sub->type == V4L2_EVENT_CTRL)
3425 return v4l2_event_subscribe(fh, sub, 0, &v4l2_ctrl_sub_ev_ops);
3426 return -EINVAL;
3427 }
3428 EXPORT_SYMBOL(v4l2_ctrl_subscribe_event);
3429
3430 int v4l2_ctrl_subdev_subscribe_event(struct v4l2_subdev *sd, struct v4l2_fh *fh,
3431 struct v4l2_event_subscription *sub)
3432 {
3433 if (!sd->ctrl_handler)
3434 return -EINVAL;
3435 return v4l2_ctrl_subscribe_event(fh, sub);
3436 }
3437 EXPORT_SYMBOL(v4l2_ctrl_subdev_subscribe_event);
3438
3439 unsigned int v4l2_ctrl_poll(struct file *file, struct poll_table_struct *wait)
3440 {
3441 struct v4l2_fh *fh = file->private_data;
3442
3443 if (v4l2_event_pending(fh))
3444 return POLLPRI;
3445 poll_wait(file, &fh->wait, wait);
3446 return 0;
3447 }
3448 EXPORT_SYMBOL(v4l2_ctrl_poll);
Linux with added FPC-III support