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Merge remote-tracking branch 'mkp-scsi/fixes' into fixes
[mirror_ubuntu-artful-kernel.git] / drivers / media / v4l2-core / v4l2-ctrls.c
1 /*
2 V4L2 controls framework implementation.
3
4 Copyright (C) 2010 Hans Verkuil <hverkuil@xs4all.nl>
5
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
10
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 */
20
21 #include <linux/ctype.h>
22 #include <linux/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 "Stereo High",
365 "Multiview High",
366 NULL,
367 };
368 static const char * const vui_sar_idc[] = {
369 "Unspecified",
370 "1:1",
371 "12:11",
372 "10:11",
373 "16:11",
374 "40:33",
375 "24:11",
376 "20:11",
377 "32:11",
378 "80:33",
379 "18:11",
380 "15:11",
381 "64:33",
382 "160:99",
383 "4:3",
384 "3:2",
385 "2:1",
386 "Extended SAR",
387 NULL,
388 };
389 static const char * const h264_fp_arrangement_type[] = {
390 "Checkerboard",
391 "Column",
392 "Row",
393 "Side by Side",
394 "Top Bottom",
395 "Temporal",
396 NULL,
397 };
398 static const char * const h264_fmo_map_type[] = {
399 "Interleaved Slices",
400 "Scattered Slices",
401 "Foreground with Leftover",
402 "Box Out",
403 "Raster Scan",
404 "Wipe Scan",
405 "Explicit",
406 NULL,
407 };
408 static const char * const mpeg_mpeg4_level[] = {
409 "0",
410 "0b",
411 "1",
412 "2",
413 "3",
414 "3b",
415 "4",
416 "5",
417 NULL,
418 };
419 static const char * const mpeg4_profile[] = {
420 "Simple",
421 "Advanced Simple",
422 "Core",
423 "Simple Scalable",
424 "Advanced Coding Efficiency",
425 NULL,
426 };
427
428 static const char * const vpx_golden_frame_sel[] = {
429 "Use Previous Frame",
430 "Use Previous Specific Frame",
431 NULL,
432 };
433
434 static const char * const flash_led_mode[] = {
435 "Off",
436 "Flash",
437 "Torch",
438 NULL,
439 };
440 static const char * const flash_strobe_source[] = {
441 "Software",
442 "External",
443 NULL,
444 };
445
446 static const char * const jpeg_chroma_subsampling[] = {
447 "4:4:4",
448 "4:2:2",
449 "4:2:0",
450 "4:1:1",
451 "4:1:0",
452 "Gray",
453 NULL,
454 };
455 static const char * const dv_tx_mode[] = {
456 "DVI-D",
457 "HDMI",
458 NULL,
459 };
460 static const char * const dv_rgb_range[] = {
461 "Automatic",
462 "RGB limited range (16-235)",
463 "RGB full range (0-255)",
464 NULL,
465 };
466 static const char * const dv_it_content_type[] = {
467 "Graphics",
468 "Photo",
469 "Cinema",
470 "Game",
471 "No IT Content",
472 NULL,
473 };
474 static const char * const detect_md_mode[] = {
475 "Disabled",
476 "Global",
477 "Threshold Grid",
478 "Region Grid",
479 NULL,
480 };
481
482
483 switch (id) {
484 case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ:
485 return mpeg_audio_sampling_freq;
486 case V4L2_CID_MPEG_AUDIO_ENCODING:
487 return mpeg_audio_encoding;
488 case V4L2_CID_MPEG_AUDIO_L1_BITRATE:
489 return mpeg_audio_l1_bitrate;
490 case V4L2_CID_MPEG_AUDIO_L2_BITRATE:
491 return mpeg_audio_l2_bitrate;
492 case V4L2_CID_MPEG_AUDIO_L3_BITRATE:
493 return mpeg_audio_l3_bitrate;
494 case V4L2_CID_MPEG_AUDIO_AC3_BITRATE:
495 return mpeg_audio_ac3_bitrate;
496 case V4L2_CID_MPEG_AUDIO_MODE:
497 return mpeg_audio_mode;
498 case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION:
499 return mpeg_audio_mode_extension;
500 case V4L2_CID_MPEG_AUDIO_EMPHASIS:
501 return mpeg_audio_emphasis;
502 case V4L2_CID_MPEG_AUDIO_CRC:
503 return mpeg_audio_crc;
504 case V4L2_CID_MPEG_AUDIO_DEC_PLAYBACK:
505 case V4L2_CID_MPEG_AUDIO_DEC_MULTILINGUAL_PLAYBACK:
506 return mpeg_audio_dec_playback;
507 case V4L2_CID_MPEG_VIDEO_ENCODING:
508 return mpeg_video_encoding;
509 case V4L2_CID_MPEG_VIDEO_ASPECT:
510 return mpeg_video_aspect;
511 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
512 return mpeg_video_bitrate_mode;
513 case V4L2_CID_MPEG_STREAM_TYPE:
514 return mpeg_stream_type;
515 case V4L2_CID_MPEG_STREAM_VBI_FMT:
516 return mpeg_stream_vbi_fmt;
517 case V4L2_CID_POWER_LINE_FREQUENCY:
518 return camera_power_line_frequency;
519 case V4L2_CID_EXPOSURE_AUTO:
520 return camera_exposure_auto;
521 case V4L2_CID_EXPOSURE_METERING:
522 return camera_exposure_metering;
523 case V4L2_CID_AUTO_FOCUS_RANGE:
524 return camera_auto_focus_range;
525 case V4L2_CID_COLORFX:
526 return colorfx;
527 case V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE:
528 return auto_n_preset_white_balance;
529 case V4L2_CID_ISO_SENSITIVITY_AUTO:
530 return camera_iso_sensitivity_auto;
531 case V4L2_CID_SCENE_MODE:
532 return scene_mode;
533 case V4L2_CID_TUNE_PREEMPHASIS:
534 return tune_emphasis;
535 case V4L2_CID_TUNE_DEEMPHASIS:
536 return tune_emphasis;
537 case V4L2_CID_FLASH_LED_MODE:
538 return flash_led_mode;
539 case V4L2_CID_FLASH_STROBE_SOURCE:
540 return flash_strobe_source;
541 case V4L2_CID_MPEG_VIDEO_HEADER_MODE:
542 return header_mode;
543 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE:
544 return multi_slice;
545 case V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE:
546 return entropy_mode;
547 case V4L2_CID_MPEG_VIDEO_H264_LEVEL:
548 return mpeg_h264_level;
549 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE:
550 return h264_loop_filter;
551 case V4L2_CID_MPEG_VIDEO_H264_PROFILE:
552 return h264_profile;
553 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC:
554 return vui_sar_idc;
555 case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE:
556 return h264_fp_arrangement_type;
557 case V4L2_CID_MPEG_VIDEO_H264_FMO_MAP_TYPE:
558 return h264_fmo_map_type;
559 case V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL:
560 return mpeg_mpeg4_level;
561 case V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE:
562 return mpeg4_profile;
563 case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_SEL:
564 return vpx_golden_frame_sel;
565 case V4L2_CID_JPEG_CHROMA_SUBSAMPLING:
566 return jpeg_chroma_subsampling;
567 case V4L2_CID_DV_TX_MODE:
568 return dv_tx_mode;
569 case V4L2_CID_DV_TX_RGB_RANGE:
570 case V4L2_CID_DV_RX_RGB_RANGE:
571 return dv_rgb_range;
572 case V4L2_CID_DV_TX_IT_CONTENT_TYPE:
573 case V4L2_CID_DV_RX_IT_CONTENT_TYPE:
574 return dv_it_content_type;
575 case V4L2_CID_DETECT_MD_MODE:
576 return detect_md_mode;
577
578 default:
579 return NULL;
580 }
581 }
582 EXPORT_SYMBOL(v4l2_ctrl_get_menu);
583
584 #define __v4l2_qmenu_int_len(arr, len) ({ *(len) = ARRAY_SIZE(arr); arr; })
585 /*
586 * Returns NULL or an s64 type array containing the menu for given
587 * control ID. The total number of the menu items is returned in @len.
588 */
589 const s64 *v4l2_ctrl_get_int_menu(u32 id, u32 *len)
590 {
591 static const s64 qmenu_int_vpx_num_partitions[] = {
592 1, 2, 4, 8,
593 };
594
595 static const s64 qmenu_int_vpx_num_ref_frames[] = {
596 1, 2, 3,
597 };
598
599 switch (id) {
600 case V4L2_CID_MPEG_VIDEO_VPX_NUM_PARTITIONS:
601 return __v4l2_qmenu_int_len(qmenu_int_vpx_num_partitions, len);
602 case V4L2_CID_MPEG_VIDEO_VPX_NUM_REF_FRAMES:
603 return __v4l2_qmenu_int_len(qmenu_int_vpx_num_ref_frames, len);
604 default:
605 *len = 0;
606 return NULL;
607 }
608 }
609 EXPORT_SYMBOL(v4l2_ctrl_get_int_menu);
610
611 /* Return the control name. */
612 const char *v4l2_ctrl_get_name(u32 id)
613 {
614 switch (id) {
615 /* USER controls */
616 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
617 case V4L2_CID_USER_CLASS: return "User Controls";
618 case V4L2_CID_BRIGHTNESS: return "Brightness";
619 case V4L2_CID_CONTRAST: return "Contrast";
620 case V4L2_CID_SATURATION: return "Saturation";
621 case V4L2_CID_HUE: return "Hue";
622 case V4L2_CID_AUDIO_VOLUME: return "Volume";
623 case V4L2_CID_AUDIO_BALANCE: return "Balance";
624 case V4L2_CID_AUDIO_BASS: return "Bass";
625 case V4L2_CID_AUDIO_TREBLE: return "Treble";
626 case V4L2_CID_AUDIO_MUTE: return "Mute";
627 case V4L2_CID_AUDIO_LOUDNESS: return "Loudness";
628 case V4L2_CID_BLACK_LEVEL: return "Black Level";
629 case V4L2_CID_AUTO_WHITE_BALANCE: return "White Balance, Automatic";
630 case V4L2_CID_DO_WHITE_BALANCE: return "Do White Balance";
631 case V4L2_CID_RED_BALANCE: return "Red Balance";
632 case V4L2_CID_BLUE_BALANCE: return "Blue Balance";
633 case V4L2_CID_GAMMA: return "Gamma";
634 case V4L2_CID_EXPOSURE: return "Exposure";
635 case V4L2_CID_AUTOGAIN: return "Gain, Automatic";
636 case V4L2_CID_GAIN: return "Gain";
637 case V4L2_CID_HFLIP: return "Horizontal Flip";
638 case V4L2_CID_VFLIP: return "Vertical Flip";
639 case V4L2_CID_POWER_LINE_FREQUENCY: return "Power Line Frequency";
640 case V4L2_CID_HUE_AUTO: return "Hue, Automatic";
641 case V4L2_CID_WHITE_BALANCE_TEMPERATURE: return "White Balance Temperature";
642 case V4L2_CID_SHARPNESS: return "Sharpness";
643 case V4L2_CID_BACKLIGHT_COMPENSATION: return "Backlight Compensation";
644 case V4L2_CID_CHROMA_AGC: return "Chroma AGC";
645 case V4L2_CID_COLOR_KILLER: return "Color Killer";
646 case V4L2_CID_COLORFX: return "Color Effects";
647 case V4L2_CID_AUTOBRIGHTNESS: return "Brightness, Automatic";
648 case V4L2_CID_BAND_STOP_FILTER: return "Band-Stop Filter";
649 case V4L2_CID_ROTATE: return "Rotate";
650 case V4L2_CID_BG_COLOR: return "Background Color";
651 case V4L2_CID_CHROMA_GAIN: return "Chroma Gain";
652 case V4L2_CID_ILLUMINATORS_1: return "Illuminator 1";
653 case V4L2_CID_ILLUMINATORS_2: return "Illuminator 2";
654 case V4L2_CID_MIN_BUFFERS_FOR_CAPTURE: return "Min Number of Capture Buffers";
655 case V4L2_CID_MIN_BUFFERS_FOR_OUTPUT: return "Min Number of Output Buffers";
656 case V4L2_CID_ALPHA_COMPONENT: return "Alpha Component";
657 case V4L2_CID_COLORFX_CBCR: return "Color Effects, CbCr";
658
659 /* Codec controls */
660 /* The MPEG controls are applicable to all codec controls
661 * and the 'MPEG' part of the define is historical */
662 /* Keep the order of the 'case's the same as in videodev2.h! */
663 case V4L2_CID_MPEG_CLASS: return "Codec Controls";
664 case V4L2_CID_MPEG_STREAM_TYPE: return "Stream Type";
665 case V4L2_CID_MPEG_STREAM_PID_PMT: return "Stream PMT Program ID";
666 case V4L2_CID_MPEG_STREAM_PID_AUDIO: return "Stream Audio Program ID";
667 case V4L2_CID_MPEG_STREAM_PID_VIDEO: return "Stream Video Program ID";
668 case V4L2_CID_MPEG_STREAM_PID_PCR: return "Stream PCR Program ID";
669 case V4L2_CID_MPEG_STREAM_PES_ID_AUDIO: return "Stream PES Audio ID";
670 case V4L2_CID_MPEG_STREAM_PES_ID_VIDEO: return "Stream PES Video ID";
671 case V4L2_CID_MPEG_STREAM_VBI_FMT: return "Stream VBI Format";
672 case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ: return "Audio Sampling Frequency";
673 case V4L2_CID_MPEG_AUDIO_ENCODING: return "Audio Encoding";
674 case V4L2_CID_MPEG_AUDIO_L1_BITRATE: return "Audio Layer I Bitrate";
675 case V4L2_CID_MPEG_AUDIO_L2_BITRATE: return "Audio Layer II Bitrate";
676 case V4L2_CID_MPEG_AUDIO_L3_BITRATE: return "Audio Layer III Bitrate";
677 case V4L2_CID_MPEG_AUDIO_MODE: return "Audio Stereo Mode";
678 case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION: return "Audio Stereo Mode Extension";
679 case V4L2_CID_MPEG_AUDIO_EMPHASIS: return "Audio Emphasis";
680 case V4L2_CID_MPEG_AUDIO_CRC: return "Audio CRC";
681 case V4L2_CID_MPEG_AUDIO_MUTE: return "Audio Mute";
682 case V4L2_CID_MPEG_AUDIO_AAC_BITRATE: return "Audio AAC Bitrate";
683 case V4L2_CID_MPEG_AUDIO_AC3_BITRATE: return "Audio AC-3 Bitrate";
684 case V4L2_CID_MPEG_AUDIO_DEC_PLAYBACK: return "Audio Playback";
685 case V4L2_CID_MPEG_AUDIO_DEC_MULTILINGUAL_PLAYBACK: return "Audio Multilingual Playback";
686 case V4L2_CID_MPEG_VIDEO_ENCODING: return "Video Encoding";
687 case V4L2_CID_MPEG_VIDEO_ASPECT: return "Video Aspect";
688 case V4L2_CID_MPEG_VIDEO_B_FRAMES: return "Video B Frames";
689 case V4L2_CID_MPEG_VIDEO_GOP_SIZE: return "Video GOP Size";
690 case V4L2_CID_MPEG_VIDEO_GOP_CLOSURE: return "Video GOP Closure";
691 case V4L2_CID_MPEG_VIDEO_PULLDOWN: return "Video Pulldown";
692 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE: return "Video Bitrate Mode";
693 case V4L2_CID_MPEG_VIDEO_BITRATE: return "Video Bitrate";
694 case V4L2_CID_MPEG_VIDEO_BITRATE_PEAK: return "Video Peak Bitrate";
695 case V4L2_CID_MPEG_VIDEO_TEMPORAL_DECIMATION: return "Video Temporal Decimation";
696 case V4L2_CID_MPEG_VIDEO_MUTE: return "Video Mute";
697 case V4L2_CID_MPEG_VIDEO_MUTE_YUV: return "Video Mute YUV";
698 case V4L2_CID_MPEG_VIDEO_DECODER_SLICE_INTERFACE: return "Decoder Slice Interface";
699 case V4L2_CID_MPEG_VIDEO_DECODER_MPEG4_DEBLOCK_FILTER: return "MPEG4 Loop Filter Enable";
700 case V4L2_CID_MPEG_VIDEO_CYCLIC_INTRA_REFRESH_MB: return "Number of Intra Refresh MBs";
701 case V4L2_CID_MPEG_VIDEO_FRAME_RC_ENABLE: return "Frame Level Rate Control Enable";
702 case V4L2_CID_MPEG_VIDEO_MB_RC_ENABLE: return "H264 MB Level Rate Control";
703 case V4L2_CID_MPEG_VIDEO_HEADER_MODE: return "Sequence Header Mode";
704 case V4L2_CID_MPEG_VIDEO_MAX_REF_PIC: return "Max Number of Reference Pics";
705 case V4L2_CID_MPEG_VIDEO_H263_I_FRAME_QP: return "H263 I-Frame QP Value";
706 case V4L2_CID_MPEG_VIDEO_H263_P_FRAME_QP: return "H263 P-Frame QP Value";
707 case V4L2_CID_MPEG_VIDEO_H263_B_FRAME_QP: return "H263 B-Frame QP Value";
708 case V4L2_CID_MPEG_VIDEO_H263_MIN_QP: return "H263 Minimum QP Value";
709 case V4L2_CID_MPEG_VIDEO_H263_MAX_QP: return "H263 Maximum QP Value";
710 case V4L2_CID_MPEG_VIDEO_H264_I_FRAME_QP: return "H264 I-Frame QP Value";
711 case V4L2_CID_MPEG_VIDEO_H264_P_FRAME_QP: return "H264 P-Frame QP Value";
712 case V4L2_CID_MPEG_VIDEO_H264_B_FRAME_QP: return "H264 B-Frame QP Value";
713 case V4L2_CID_MPEG_VIDEO_H264_MAX_QP: return "H264 Maximum QP Value";
714 case V4L2_CID_MPEG_VIDEO_H264_MIN_QP: return "H264 Minimum QP Value";
715 case V4L2_CID_MPEG_VIDEO_H264_8X8_TRANSFORM: return "H264 8x8 Transform Enable";
716 case V4L2_CID_MPEG_VIDEO_H264_CPB_SIZE: return "H264 CPB Buffer Size";
717 case V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE: return "H264 Entropy Mode";
718 case V4L2_CID_MPEG_VIDEO_H264_I_PERIOD: return "H264 I-Frame Period";
719 case V4L2_CID_MPEG_VIDEO_H264_LEVEL: return "H264 Level";
720 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_ALPHA: return "H264 Loop Filter Alpha Offset";
721 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_BETA: return "H264 Loop Filter Beta Offset";
722 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE: return "H264 Loop Filter Mode";
723 case V4L2_CID_MPEG_VIDEO_H264_PROFILE: return "H264 Profile";
724 case V4L2_CID_MPEG_VIDEO_H264_VUI_EXT_SAR_HEIGHT: return "Vertical Size of SAR";
725 case V4L2_CID_MPEG_VIDEO_H264_VUI_EXT_SAR_WIDTH: return "Horizontal Size of SAR";
726 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_ENABLE: return "Aspect Ratio VUI Enable";
727 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC: return "VUI Aspect Ratio IDC";
728 case V4L2_CID_MPEG_VIDEO_H264_SEI_FRAME_PACKING: return "H264 Enable Frame Packing SEI";
729 case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_CURRENT_FRAME_0: return "H264 Set Curr. Frame as Frame0";
730 case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE: return "H264 FP Arrangement Type";
731 case V4L2_CID_MPEG_VIDEO_H264_FMO: return "H264 Flexible MB Ordering";
732 case V4L2_CID_MPEG_VIDEO_H264_FMO_MAP_TYPE: return "H264 Map Type for FMO";
733 case V4L2_CID_MPEG_VIDEO_H264_FMO_SLICE_GROUP: return "H264 FMO Number of Slice Groups";
734 case V4L2_CID_MPEG_VIDEO_H264_FMO_CHANGE_DIRECTION: return "H264 FMO Direction of Change";
735 case V4L2_CID_MPEG_VIDEO_H264_FMO_CHANGE_RATE: return "H264 FMO Size of 1st Slice Grp";
736 case V4L2_CID_MPEG_VIDEO_H264_FMO_RUN_LENGTH: return "H264 FMO No. of Consecutive MBs";
737 case V4L2_CID_MPEG_VIDEO_H264_ASO: return "H264 Arbitrary Slice Ordering";
738 case V4L2_CID_MPEG_VIDEO_H264_ASO_SLICE_ORDER: return "H264 ASO Slice Order";
739 case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING: return "Enable H264 Hierarchical Coding";
740 case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_TYPE: return "H264 Hierarchical Coding Type";
741 case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_LAYER:return "H264 Number of HC Layers";
742 case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_LAYER_QP:
743 return "H264 Set QP Value for HC Layers";
744 case V4L2_CID_MPEG_VIDEO_MPEG4_I_FRAME_QP: return "MPEG4 I-Frame QP Value";
745 case V4L2_CID_MPEG_VIDEO_MPEG4_P_FRAME_QP: return "MPEG4 P-Frame QP Value";
746 case V4L2_CID_MPEG_VIDEO_MPEG4_B_FRAME_QP: return "MPEG4 B-Frame QP Value";
747 case V4L2_CID_MPEG_VIDEO_MPEG4_MIN_QP: return "MPEG4 Minimum QP Value";
748 case V4L2_CID_MPEG_VIDEO_MPEG4_MAX_QP: return "MPEG4 Maximum QP Value";
749 case V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL: return "MPEG4 Level";
750 case V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE: return "MPEG4 Profile";
751 case V4L2_CID_MPEG_VIDEO_MPEG4_QPEL: return "Quarter Pixel Search Enable";
752 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MAX_BYTES: return "Maximum Bytes in a Slice";
753 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MAX_MB: return "Number of MBs in a Slice";
754 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE: return "Slice Partitioning Method";
755 case V4L2_CID_MPEG_VIDEO_VBV_SIZE: return "VBV Buffer Size";
756 case V4L2_CID_MPEG_VIDEO_DEC_PTS: return "Video Decoder PTS";
757 case V4L2_CID_MPEG_VIDEO_DEC_FRAME: return "Video Decoder Frame Count";
758 case V4L2_CID_MPEG_VIDEO_VBV_DELAY: return "Initial Delay for VBV Control";
759 case V4L2_CID_MPEG_VIDEO_MV_H_SEARCH_RANGE: return "Horizontal MV Search Range";
760 case V4L2_CID_MPEG_VIDEO_MV_V_SEARCH_RANGE: return "Vertical MV Search Range";
761 case V4L2_CID_MPEG_VIDEO_REPEAT_SEQ_HEADER: return "Repeat Sequence Header";
762 case V4L2_CID_MPEG_VIDEO_FORCE_KEY_FRAME: return "Force Key Frame";
763
764 /* VPX controls */
765 case V4L2_CID_MPEG_VIDEO_VPX_NUM_PARTITIONS: return "VPX Number of Partitions";
766 case V4L2_CID_MPEG_VIDEO_VPX_IMD_DISABLE_4X4: return "VPX Intra Mode Decision Disable";
767 case V4L2_CID_MPEG_VIDEO_VPX_NUM_REF_FRAMES: return "VPX No. of Refs for P Frame";
768 case V4L2_CID_MPEG_VIDEO_VPX_FILTER_LEVEL: return "VPX Loop Filter Level Range";
769 case V4L2_CID_MPEG_VIDEO_VPX_FILTER_SHARPNESS: return "VPX Deblocking Effect Control";
770 case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_REF_PERIOD: return "VPX Golden Frame Refresh Period";
771 case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_SEL: return "VPX Golden Frame Indicator";
772 case V4L2_CID_MPEG_VIDEO_VPX_MIN_QP: return "VPX Minimum QP Value";
773 case V4L2_CID_MPEG_VIDEO_VPX_MAX_QP: return "VPX Maximum QP Value";
774 case V4L2_CID_MPEG_VIDEO_VPX_I_FRAME_QP: return "VPX I-Frame QP Value";
775 case V4L2_CID_MPEG_VIDEO_VPX_P_FRAME_QP: return "VPX P-Frame QP Value";
776 case V4L2_CID_MPEG_VIDEO_VPX_PROFILE: return "VPX Profile";
777
778 /* CAMERA controls */
779 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
780 case V4L2_CID_CAMERA_CLASS: return "Camera Controls";
781 case V4L2_CID_EXPOSURE_AUTO: return "Auto Exposure";
782 case V4L2_CID_EXPOSURE_ABSOLUTE: return "Exposure Time, Absolute";
783 case V4L2_CID_EXPOSURE_AUTO_PRIORITY: return "Exposure, Dynamic Framerate";
784 case V4L2_CID_PAN_RELATIVE: return "Pan, Relative";
785 case V4L2_CID_TILT_RELATIVE: return "Tilt, Relative";
786 case V4L2_CID_PAN_RESET: return "Pan, Reset";
787 case V4L2_CID_TILT_RESET: return "Tilt, Reset";
788 case V4L2_CID_PAN_ABSOLUTE: return "Pan, Absolute";
789 case V4L2_CID_TILT_ABSOLUTE: return "Tilt, Absolute";
790 case V4L2_CID_FOCUS_ABSOLUTE: return "Focus, Absolute";
791 case V4L2_CID_FOCUS_RELATIVE: return "Focus, Relative";
792 case V4L2_CID_FOCUS_AUTO: return "Focus, Automatic Continuous";
793 case V4L2_CID_ZOOM_ABSOLUTE: return "Zoom, Absolute";
794 case V4L2_CID_ZOOM_RELATIVE: return "Zoom, Relative";
795 case V4L2_CID_ZOOM_CONTINUOUS: return "Zoom, Continuous";
796 case V4L2_CID_PRIVACY: return "Privacy";
797 case V4L2_CID_IRIS_ABSOLUTE: return "Iris, Absolute";
798 case V4L2_CID_IRIS_RELATIVE: return "Iris, Relative";
799 case V4L2_CID_AUTO_EXPOSURE_BIAS: return "Auto Exposure, Bias";
800 case V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE: return "White Balance, Auto & Preset";
801 case V4L2_CID_WIDE_DYNAMIC_RANGE: return "Wide Dynamic Range";
802 case V4L2_CID_IMAGE_STABILIZATION: return "Image Stabilization";
803 case V4L2_CID_ISO_SENSITIVITY: return "ISO Sensitivity";
804 case V4L2_CID_ISO_SENSITIVITY_AUTO: return "ISO Sensitivity, Auto";
805 case V4L2_CID_EXPOSURE_METERING: return "Exposure, Metering Mode";
806 case V4L2_CID_SCENE_MODE: return "Scene Mode";
807 case V4L2_CID_3A_LOCK: return "3A Lock";
808 case V4L2_CID_AUTO_FOCUS_START: return "Auto Focus, Start";
809 case V4L2_CID_AUTO_FOCUS_STOP: return "Auto Focus, Stop";
810 case V4L2_CID_AUTO_FOCUS_STATUS: return "Auto Focus, Status";
811 case V4L2_CID_AUTO_FOCUS_RANGE: return "Auto Focus, Range";
812 case V4L2_CID_PAN_SPEED: return "Pan, Speed";
813 case V4L2_CID_TILT_SPEED: return "Tilt, Speed";
814
815 /* FM Radio Modulator controls */
816 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
817 case V4L2_CID_FM_TX_CLASS: return "FM Radio Modulator Controls";
818 case V4L2_CID_RDS_TX_DEVIATION: return "RDS Signal Deviation";
819 case V4L2_CID_RDS_TX_PI: return "RDS Program ID";
820 case V4L2_CID_RDS_TX_PTY: return "RDS Program Type";
821 case V4L2_CID_RDS_TX_PS_NAME: return "RDS PS Name";
822 case V4L2_CID_RDS_TX_RADIO_TEXT: return "RDS Radio Text";
823 case V4L2_CID_RDS_TX_MONO_STEREO: return "RDS Stereo";
824 case V4L2_CID_RDS_TX_ARTIFICIAL_HEAD: return "RDS Artificial Head";
825 case V4L2_CID_RDS_TX_COMPRESSED: return "RDS Compressed";
826 case V4L2_CID_RDS_TX_DYNAMIC_PTY: return "RDS Dynamic PTY";
827 case V4L2_CID_RDS_TX_TRAFFIC_ANNOUNCEMENT: return "RDS Traffic Announcement";
828 case V4L2_CID_RDS_TX_TRAFFIC_PROGRAM: return "RDS Traffic Program";
829 case V4L2_CID_RDS_TX_MUSIC_SPEECH: return "RDS Music";
830 case V4L2_CID_RDS_TX_ALT_FREQS_ENABLE: return "RDS Enable Alt Frequencies";
831 case V4L2_CID_RDS_TX_ALT_FREQS: return "RDS Alternate Frequencies";
832 case V4L2_CID_AUDIO_LIMITER_ENABLED: return "Audio Limiter Feature Enabled";
833 case V4L2_CID_AUDIO_LIMITER_RELEASE_TIME: return "Audio Limiter Release Time";
834 case V4L2_CID_AUDIO_LIMITER_DEVIATION: return "Audio Limiter Deviation";
835 case V4L2_CID_AUDIO_COMPRESSION_ENABLED: return "Audio Compression Enabled";
836 case V4L2_CID_AUDIO_COMPRESSION_GAIN: return "Audio Compression Gain";
837 case V4L2_CID_AUDIO_COMPRESSION_THRESHOLD: return "Audio Compression Threshold";
838 case V4L2_CID_AUDIO_COMPRESSION_ATTACK_TIME: return "Audio Compression Attack Time";
839 case V4L2_CID_AUDIO_COMPRESSION_RELEASE_TIME: return "Audio Compression Release Time";
840 case V4L2_CID_PILOT_TONE_ENABLED: return "Pilot Tone Feature Enabled";
841 case V4L2_CID_PILOT_TONE_DEVIATION: return "Pilot Tone Deviation";
842 case V4L2_CID_PILOT_TONE_FREQUENCY: return "Pilot Tone Frequency";
843 case V4L2_CID_TUNE_PREEMPHASIS: return "Pre-Emphasis";
844 case V4L2_CID_TUNE_POWER_LEVEL: return "Tune Power Level";
845 case V4L2_CID_TUNE_ANTENNA_CAPACITOR: return "Tune Antenna Capacitor";
846
847 /* Flash controls */
848 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
849 case V4L2_CID_FLASH_CLASS: return "Flash Controls";
850 case V4L2_CID_FLASH_LED_MODE: return "LED Mode";
851 case V4L2_CID_FLASH_STROBE_SOURCE: return "Strobe Source";
852 case V4L2_CID_FLASH_STROBE: return "Strobe";
853 case V4L2_CID_FLASH_STROBE_STOP: return "Stop Strobe";
854 case V4L2_CID_FLASH_STROBE_STATUS: return "Strobe Status";
855 case V4L2_CID_FLASH_TIMEOUT: return "Strobe Timeout";
856 case V4L2_CID_FLASH_INTENSITY: return "Intensity, Flash Mode";
857 case V4L2_CID_FLASH_TORCH_INTENSITY: return "Intensity, Torch Mode";
858 case V4L2_CID_FLASH_INDICATOR_INTENSITY: return "Intensity, Indicator";
859 case V4L2_CID_FLASH_FAULT: return "Faults";
860 case V4L2_CID_FLASH_CHARGE: return "Charge";
861 case V4L2_CID_FLASH_READY: return "Ready to Strobe";
862
863 /* JPEG encoder controls */
864 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
865 case V4L2_CID_JPEG_CLASS: return "JPEG Compression Controls";
866 case V4L2_CID_JPEG_CHROMA_SUBSAMPLING: return "Chroma Subsampling";
867 case V4L2_CID_JPEG_RESTART_INTERVAL: return "Restart Interval";
868 case V4L2_CID_JPEG_COMPRESSION_QUALITY: return "Compression Quality";
869 case V4L2_CID_JPEG_ACTIVE_MARKER: return "Active Markers";
870
871 /* Image source controls */
872 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
873 case V4L2_CID_IMAGE_SOURCE_CLASS: return "Image Source Controls";
874 case V4L2_CID_VBLANK: return "Vertical Blanking";
875 case V4L2_CID_HBLANK: return "Horizontal Blanking";
876 case V4L2_CID_ANALOGUE_GAIN: return "Analogue Gain";
877 case V4L2_CID_TEST_PATTERN_RED: return "Red Pixel Value";
878 case V4L2_CID_TEST_PATTERN_GREENR: return "Green (Red) Pixel Value";
879 case V4L2_CID_TEST_PATTERN_BLUE: return "Blue Pixel Value";
880 case V4L2_CID_TEST_PATTERN_GREENB: return "Green (Blue) Pixel Value";
881
882 /* Image processing controls */
883 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
884 case V4L2_CID_IMAGE_PROC_CLASS: return "Image Processing Controls";
885 case V4L2_CID_LINK_FREQ: return "Link Frequency";
886 case V4L2_CID_PIXEL_RATE: return "Pixel Rate";
887 case V4L2_CID_TEST_PATTERN: return "Test Pattern";
888 case V4L2_CID_DEINTERLACING_MODE: return "Deinterlacing Mode";
889
890 /* DV controls */
891 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
892 case V4L2_CID_DV_CLASS: return "Digital Video Controls";
893 case V4L2_CID_DV_TX_HOTPLUG: return "Hotplug Present";
894 case V4L2_CID_DV_TX_RXSENSE: return "RxSense Present";
895 case V4L2_CID_DV_TX_EDID_PRESENT: return "EDID Present";
896 case V4L2_CID_DV_TX_MODE: return "Transmit Mode";
897 case V4L2_CID_DV_TX_RGB_RANGE: return "Tx RGB Quantization Range";
898 case V4L2_CID_DV_TX_IT_CONTENT_TYPE: return "Tx IT Content Type";
899 case V4L2_CID_DV_RX_POWER_PRESENT: return "Power Present";
900 case V4L2_CID_DV_RX_RGB_RANGE: return "Rx RGB Quantization Range";
901 case V4L2_CID_DV_RX_IT_CONTENT_TYPE: return "Rx IT Content Type";
902
903 case V4L2_CID_FM_RX_CLASS: return "FM Radio Receiver Controls";
904 case V4L2_CID_TUNE_DEEMPHASIS: return "De-Emphasis";
905 case V4L2_CID_RDS_RECEPTION: return "RDS Reception";
906 case V4L2_CID_RF_TUNER_CLASS: return "RF Tuner Controls";
907 case V4L2_CID_RF_TUNER_RF_GAIN: return "RF Gain";
908 case V4L2_CID_RF_TUNER_LNA_GAIN_AUTO: return "LNA Gain, Auto";
909 case V4L2_CID_RF_TUNER_LNA_GAIN: return "LNA Gain";
910 case V4L2_CID_RF_TUNER_MIXER_GAIN_AUTO: return "Mixer Gain, Auto";
911 case V4L2_CID_RF_TUNER_MIXER_GAIN: return "Mixer Gain";
912 case V4L2_CID_RF_TUNER_IF_GAIN_AUTO: return "IF Gain, Auto";
913 case V4L2_CID_RF_TUNER_IF_GAIN: return "IF Gain";
914 case V4L2_CID_RF_TUNER_BANDWIDTH_AUTO: return "Bandwidth, Auto";
915 case V4L2_CID_RF_TUNER_BANDWIDTH: return "Bandwidth";
916 case V4L2_CID_RF_TUNER_PLL_LOCK: return "PLL Lock";
917 case V4L2_CID_RDS_RX_PTY: return "RDS Program Type";
918 case V4L2_CID_RDS_RX_PS_NAME: return "RDS PS Name";
919 case V4L2_CID_RDS_RX_RADIO_TEXT: return "RDS Radio Text";
920 case V4L2_CID_RDS_RX_TRAFFIC_ANNOUNCEMENT: return "RDS Traffic Announcement";
921 case V4L2_CID_RDS_RX_TRAFFIC_PROGRAM: return "RDS Traffic Program";
922 case V4L2_CID_RDS_RX_MUSIC_SPEECH: return "RDS Music";
923
924 /* Detection controls */
925 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
926 case V4L2_CID_DETECT_CLASS: return "Detection Controls";
927 case V4L2_CID_DETECT_MD_MODE: return "Motion Detection Mode";
928 case V4L2_CID_DETECT_MD_GLOBAL_THRESHOLD: return "MD Global Threshold";
929 case V4L2_CID_DETECT_MD_THRESHOLD_GRID: return "MD Threshold Grid";
930 case V4L2_CID_DETECT_MD_REGION_GRID: return "MD Region Grid";
931 default:
932 return NULL;
933 }
934 }
935 EXPORT_SYMBOL(v4l2_ctrl_get_name);
936
937 void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type,
938 s64 *min, s64 *max, u64 *step, s64 *def, u32 *flags)
939 {
940 *name = v4l2_ctrl_get_name(id);
941 *flags = 0;
942
943 switch (id) {
944 case V4L2_CID_AUDIO_MUTE:
945 case V4L2_CID_AUDIO_LOUDNESS:
946 case V4L2_CID_AUTO_WHITE_BALANCE:
947 case V4L2_CID_AUTOGAIN:
948 case V4L2_CID_HFLIP:
949 case V4L2_CID_VFLIP:
950 case V4L2_CID_HUE_AUTO:
951 case V4L2_CID_CHROMA_AGC:
952 case V4L2_CID_COLOR_KILLER:
953 case V4L2_CID_AUTOBRIGHTNESS:
954 case V4L2_CID_MPEG_AUDIO_MUTE:
955 case V4L2_CID_MPEG_VIDEO_MUTE:
956 case V4L2_CID_MPEG_VIDEO_GOP_CLOSURE:
957 case V4L2_CID_MPEG_VIDEO_PULLDOWN:
958 case V4L2_CID_EXPOSURE_AUTO_PRIORITY:
959 case V4L2_CID_FOCUS_AUTO:
960 case V4L2_CID_PRIVACY:
961 case V4L2_CID_AUDIO_LIMITER_ENABLED:
962 case V4L2_CID_AUDIO_COMPRESSION_ENABLED:
963 case V4L2_CID_PILOT_TONE_ENABLED:
964 case V4L2_CID_ILLUMINATORS_1:
965 case V4L2_CID_ILLUMINATORS_2:
966 case V4L2_CID_FLASH_STROBE_STATUS:
967 case V4L2_CID_FLASH_CHARGE:
968 case V4L2_CID_FLASH_READY:
969 case V4L2_CID_MPEG_VIDEO_DECODER_MPEG4_DEBLOCK_FILTER:
970 case V4L2_CID_MPEG_VIDEO_DECODER_SLICE_INTERFACE:
971 case V4L2_CID_MPEG_VIDEO_FRAME_RC_ENABLE:
972 case V4L2_CID_MPEG_VIDEO_MB_RC_ENABLE:
973 case V4L2_CID_MPEG_VIDEO_H264_8X8_TRANSFORM:
974 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_ENABLE:
975 case V4L2_CID_MPEG_VIDEO_MPEG4_QPEL:
976 case V4L2_CID_MPEG_VIDEO_REPEAT_SEQ_HEADER:
977 case V4L2_CID_WIDE_DYNAMIC_RANGE:
978 case V4L2_CID_IMAGE_STABILIZATION:
979 case V4L2_CID_RDS_RECEPTION:
980 case V4L2_CID_RF_TUNER_LNA_GAIN_AUTO:
981 case V4L2_CID_RF_TUNER_MIXER_GAIN_AUTO:
982 case V4L2_CID_RF_TUNER_IF_GAIN_AUTO:
983 case V4L2_CID_RF_TUNER_BANDWIDTH_AUTO:
984 case V4L2_CID_RF_TUNER_PLL_LOCK:
985 case V4L2_CID_RDS_TX_MONO_STEREO:
986 case V4L2_CID_RDS_TX_ARTIFICIAL_HEAD:
987 case V4L2_CID_RDS_TX_COMPRESSED:
988 case V4L2_CID_RDS_TX_DYNAMIC_PTY:
989 case V4L2_CID_RDS_TX_TRAFFIC_ANNOUNCEMENT:
990 case V4L2_CID_RDS_TX_TRAFFIC_PROGRAM:
991 case V4L2_CID_RDS_TX_MUSIC_SPEECH:
992 case V4L2_CID_RDS_TX_ALT_FREQS_ENABLE:
993 case V4L2_CID_RDS_RX_TRAFFIC_ANNOUNCEMENT:
994 case V4L2_CID_RDS_RX_TRAFFIC_PROGRAM:
995 case V4L2_CID_RDS_RX_MUSIC_SPEECH:
996 *type = V4L2_CTRL_TYPE_BOOLEAN;
997 *min = 0;
998 *max = *step = 1;
999 break;
1000 case V4L2_CID_MPEG_VIDEO_MV_H_SEARCH_RANGE:
1001 case V4L2_CID_MPEG_VIDEO_MV_V_SEARCH_RANGE:
1002 *type = V4L2_CTRL_TYPE_INTEGER;
1003 break;
1004 case V4L2_CID_MPEG_VIDEO_FORCE_KEY_FRAME:
1005 case V4L2_CID_PAN_RESET:
1006 case V4L2_CID_TILT_RESET:
1007 case V4L2_CID_FLASH_STROBE:
1008 case V4L2_CID_FLASH_STROBE_STOP:
1009 case V4L2_CID_AUTO_FOCUS_START:
1010 case V4L2_CID_AUTO_FOCUS_STOP:
1011 *type = V4L2_CTRL_TYPE_BUTTON;
1012 *flags |= V4L2_CTRL_FLAG_WRITE_ONLY |
1013 V4L2_CTRL_FLAG_EXECUTE_ON_WRITE;
1014 *min = *max = *step = *def = 0;
1015 break;
1016 case V4L2_CID_POWER_LINE_FREQUENCY:
1017 case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ:
1018 case V4L2_CID_MPEG_AUDIO_ENCODING:
1019 case V4L2_CID_MPEG_AUDIO_L1_BITRATE:
1020 case V4L2_CID_MPEG_AUDIO_L2_BITRATE:
1021 case V4L2_CID_MPEG_AUDIO_L3_BITRATE:
1022 case V4L2_CID_MPEG_AUDIO_AC3_BITRATE:
1023 case V4L2_CID_MPEG_AUDIO_MODE:
1024 case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION:
1025 case V4L2_CID_MPEG_AUDIO_EMPHASIS:
1026 case V4L2_CID_MPEG_AUDIO_CRC:
1027 case V4L2_CID_MPEG_AUDIO_DEC_PLAYBACK:
1028 case V4L2_CID_MPEG_AUDIO_DEC_MULTILINGUAL_PLAYBACK:
1029 case V4L2_CID_MPEG_VIDEO_ENCODING:
1030 case V4L2_CID_MPEG_VIDEO_ASPECT:
1031 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
1032 case V4L2_CID_MPEG_STREAM_TYPE:
1033 case V4L2_CID_MPEG_STREAM_VBI_FMT:
1034 case V4L2_CID_EXPOSURE_AUTO:
1035 case V4L2_CID_AUTO_FOCUS_RANGE:
1036 case V4L2_CID_COLORFX:
1037 case V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE:
1038 case V4L2_CID_TUNE_PREEMPHASIS:
1039 case V4L2_CID_FLASH_LED_MODE:
1040 case V4L2_CID_FLASH_STROBE_SOURCE:
1041 case V4L2_CID_MPEG_VIDEO_HEADER_MODE:
1042 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE:
1043 case V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE:
1044 case V4L2_CID_MPEG_VIDEO_H264_LEVEL:
1045 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE:
1046 case V4L2_CID_MPEG_VIDEO_H264_PROFILE:
1047 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC:
1048 case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE:
1049 case V4L2_CID_MPEG_VIDEO_H264_FMO_MAP_TYPE:
1050 case V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL:
1051 case V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE:
1052 case V4L2_CID_JPEG_CHROMA_SUBSAMPLING:
1053 case V4L2_CID_ISO_SENSITIVITY_AUTO:
1054 case V4L2_CID_EXPOSURE_METERING:
1055 case V4L2_CID_SCENE_MODE:
1056 case V4L2_CID_DV_TX_MODE:
1057 case V4L2_CID_DV_TX_RGB_RANGE:
1058 case V4L2_CID_DV_TX_IT_CONTENT_TYPE:
1059 case V4L2_CID_DV_RX_RGB_RANGE:
1060 case V4L2_CID_DV_RX_IT_CONTENT_TYPE:
1061 case V4L2_CID_TEST_PATTERN:
1062 case V4L2_CID_DEINTERLACING_MODE:
1063 case V4L2_CID_TUNE_DEEMPHASIS:
1064 case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_SEL:
1065 case V4L2_CID_DETECT_MD_MODE:
1066 *type = V4L2_CTRL_TYPE_MENU;
1067 break;
1068 case V4L2_CID_LINK_FREQ:
1069 *type = V4L2_CTRL_TYPE_INTEGER_MENU;
1070 break;
1071 case V4L2_CID_RDS_TX_PS_NAME:
1072 case V4L2_CID_RDS_TX_RADIO_TEXT:
1073 case V4L2_CID_RDS_RX_PS_NAME:
1074 case V4L2_CID_RDS_RX_RADIO_TEXT:
1075 *type = V4L2_CTRL_TYPE_STRING;
1076 break;
1077 case V4L2_CID_ISO_SENSITIVITY:
1078 case V4L2_CID_AUTO_EXPOSURE_BIAS:
1079 case V4L2_CID_MPEG_VIDEO_VPX_NUM_PARTITIONS:
1080 case V4L2_CID_MPEG_VIDEO_VPX_NUM_REF_FRAMES:
1081 *type = V4L2_CTRL_TYPE_INTEGER_MENU;
1082 break;
1083 case V4L2_CID_USER_CLASS:
1084 case V4L2_CID_CAMERA_CLASS:
1085 case V4L2_CID_MPEG_CLASS:
1086 case V4L2_CID_FM_TX_CLASS:
1087 case V4L2_CID_FLASH_CLASS:
1088 case V4L2_CID_JPEG_CLASS:
1089 case V4L2_CID_IMAGE_SOURCE_CLASS:
1090 case V4L2_CID_IMAGE_PROC_CLASS:
1091 case V4L2_CID_DV_CLASS:
1092 case V4L2_CID_FM_RX_CLASS:
1093 case V4L2_CID_RF_TUNER_CLASS:
1094 case V4L2_CID_DETECT_CLASS:
1095 *type = V4L2_CTRL_TYPE_CTRL_CLASS;
1096 /* You can neither read not write these */
1097 *flags |= V4L2_CTRL_FLAG_READ_ONLY | V4L2_CTRL_FLAG_WRITE_ONLY;
1098 *min = *max = *step = *def = 0;
1099 break;
1100 case V4L2_CID_BG_COLOR:
1101 *type = V4L2_CTRL_TYPE_INTEGER;
1102 *step = 1;
1103 *min = 0;
1104 /* Max is calculated as RGB888 that is 2^24 */
1105 *max = 0xFFFFFF;
1106 break;
1107 case V4L2_CID_FLASH_FAULT:
1108 case V4L2_CID_JPEG_ACTIVE_MARKER:
1109 case V4L2_CID_3A_LOCK:
1110 case V4L2_CID_AUTO_FOCUS_STATUS:
1111 case V4L2_CID_DV_TX_HOTPLUG:
1112 case V4L2_CID_DV_TX_RXSENSE:
1113 case V4L2_CID_DV_TX_EDID_PRESENT:
1114 case V4L2_CID_DV_RX_POWER_PRESENT:
1115 *type = V4L2_CTRL_TYPE_BITMASK;
1116 break;
1117 case V4L2_CID_MIN_BUFFERS_FOR_CAPTURE:
1118 case V4L2_CID_MIN_BUFFERS_FOR_OUTPUT:
1119 *type = V4L2_CTRL_TYPE_INTEGER;
1120 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
1121 break;
1122 case V4L2_CID_MPEG_VIDEO_DEC_PTS:
1123 *type = V4L2_CTRL_TYPE_INTEGER64;
1124 *flags |= V4L2_CTRL_FLAG_VOLATILE | V4L2_CTRL_FLAG_READ_ONLY;
1125 *min = *def = 0;
1126 *max = 0x1ffffffffLL;
1127 *step = 1;
1128 break;
1129 case V4L2_CID_MPEG_VIDEO_DEC_FRAME:
1130 *type = V4L2_CTRL_TYPE_INTEGER64;
1131 *flags |= V4L2_CTRL_FLAG_VOLATILE | V4L2_CTRL_FLAG_READ_ONLY;
1132 *min = *def = 0;
1133 *max = 0x7fffffffffffffffLL;
1134 *step = 1;
1135 break;
1136 case V4L2_CID_PIXEL_RATE:
1137 *type = V4L2_CTRL_TYPE_INTEGER64;
1138 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
1139 break;
1140 case V4L2_CID_DETECT_MD_REGION_GRID:
1141 *type = V4L2_CTRL_TYPE_U8;
1142 break;
1143 case V4L2_CID_DETECT_MD_THRESHOLD_GRID:
1144 *type = V4L2_CTRL_TYPE_U16;
1145 break;
1146 case V4L2_CID_RDS_TX_ALT_FREQS:
1147 *type = V4L2_CTRL_TYPE_U32;
1148 break;
1149 default:
1150 *type = V4L2_CTRL_TYPE_INTEGER;
1151 break;
1152 }
1153 switch (id) {
1154 case V4L2_CID_MPEG_AUDIO_ENCODING:
1155 case V4L2_CID_MPEG_AUDIO_MODE:
1156 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
1157 case V4L2_CID_MPEG_VIDEO_B_FRAMES:
1158 case V4L2_CID_MPEG_STREAM_TYPE:
1159 *flags |= V4L2_CTRL_FLAG_UPDATE;
1160 break;
1161 case V4L2_CID_AUDIO_VOLUME:
1162 case V4L2_CID_AUDIO_BALANCE:
1163 case V4L2_CID_AUDIO_BASS:
1164 case V4L2_CID_AUDIO_TREBLE:
1165 case V4L2_CID_BRIGHTNESS:
1166 case V4L2_CID_CONTRAST:
1167 case V4L2_CID_SATURATION:
1168 case V4L2_CID_HUE:
1169 case V4L2_CID_RED_BALANCE:
1170 case V4L2_CID_BLUE_BALANCE:
1171 case V4L2_CID_GAMMA:
1172 case V4L2_CID_SHARPNESS:
1173 case V4L2_CID_CHROMA_GAIN:
1174 case V4L2_CID_RDS_TX_DEVIATION:
1175 case V4L2_CID_AUDIO_LIMITER_RELEASE_TIME:
1176 case V4L2_CID_AUDIO_LIMITER_DEVIATION:
1177 case V4L2_CID_AUDIO_COMPRESSION_GAIN:
1178 case V4L2_CID_AUDIO_COMPRESSION_THRESHOLD:
1179 case V4L2_CID_AUDIO_COMPRESSION_ATTACK_TIME:
1180 case V4L2_CID_AUDIO_COMPRESSION_RELEASE_TIME:
1181 case V4L2_CID_PILOT_TONE_DEVIATION:
1182 case V4L2_CID_PILOT_TONE_FREQUENCY:
1183 case V4L2_CID_TUNE_POWER_LEVEL:
1184 case V4L2_CID_TUNE_ANTENNA_CAPACITOR:
1185 case V4L2_CID_RF_TUNER_RF_GAIN:
1186 case V4L2_CID_RF_TUNER_LNA_GAIN:
1187 case V4L2_CID_RF_TUNER_MIXER_GAIN:
1188 case V4L2_CID_RF_TUNER_IF_GAIN:
1189 case V4L2_CID_RF_TUNER_BANDWIDTH:
1190 case V4L2_CID_DETECT_MD_GLOBAL_THRESHOLD:
1191 *flags |= V4L2_CTRL_FLAG_SLIDER;
1192 break;
1193 case V4L2_CID_PAN_RELATIVE:
1194 case V4L2_CID_TILT_RELATIVE:
1195 case V4L2_CID_FOCUS_RELATIVE:
1196 case V4L2_CID_IRIS_RELATIVE:
1197 case V4L2_CID_ZOOM_RELATIVE:
1198 *flags |= V4L2_CTRL_FLAG_WRITE_ONLY |
1199 V4L2_CTRL_FLAG_EXECUTE_ON_WRITE;
1200 break;
1201 case V4L2_CID_FLASH_STROBE_STATUS:
1202 case V4L2_CID_AUTO_FOCUS_STATUS:
1203 case V4L2_CID_FLASH_READY:
1204 case V4L2_CID_DV_TX_HOTPLUG:
1205 case V4L2_CID_DV_TX_RXSENSE:
1206 case V4L2_CID_DV_TX_EDID_PRESENT:
1207 case V4L2_CID_DV_RX_POWER_PRESENT:
1208 case V4L2_CID_DV_RX_IT_CONTENT_TYPE:
1209 case V4L2_CID_RDS_RX_PTY:
1210 case V4L2_CID_RDS_RX_PS_NAME:
1211 case V4L2_CID_RDS_RX_RADIO_TEXT:
1212 case V4L2_CID_RDS_RX_TRAFFIC_ANNOUNCEMENT:
1213 case V4L2_CID_RDS_RX_TRAFFIC_PROGRAM:
1214 case V4L2_CID_RDS_RX_MUSIC_SPEECH:
1215 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
1216 break;
1217 case V4L2_CID_RF_TUNER_PLL_LOCK:
1218 *flags |= V4L2_CTRL_FLAG_VOLATILE;
1219 break;
1220 }
1221 }
1222 EXPORT_SYMBOL(v4l2_ctrl_fill);
1223
1224 static void fill_event(struct v4l2_event *ev, struct v4l2_ctrl *ctrl, u32 changes)
1225 {
1226 memset(ev->reserved, 0, sizeof(ev->reserved));
1227 ev->type = V4L2_EVENT_CTRL;
1228 ev->id = ctrl->id;
1229 ev->u.ctrl.changes = changes;
1230 ev->u.ctrl.type = ctrl->type;
1231 ev->u.ctrl.flags = ctrl->flags;
1232 if (ctrl->is_ptr)
1233 ev->u.ctrl.value64 = 0;
1234 else
1235 ev->u.ctrl.value64 = *ctrl->p_cur.p_s64;
1236 ev->u.ctrl.minimum = ctrl->minimum;
1237 ev->u.ctrl.maximum = ctrl->maximum;
1238 if (ctrl->type == V4L2_CTRL_TYPE_MENU
1239 || ctrl->type == V4L2_CTRL_TYPE_INTEGER_MENU)
1240 ev->u.ctrl.step = 1;
1241 else
1242 ev->u.ctrl.step = ctrl->step;
1243 ev->u.ctrl.default_value = ctrl->default_value;
1244 }
1245
1246 static void send_event(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, u32 changes)
1247 {
1248 struct v4l2_event ev;
1249 struct v4l2_subscribed_event *sev;
1250
1251 if (list_empty(&ctrl->ev_subs))
1252 return;
1253 fill_event(&ev, ctrl, changes);
1254
1255 list_for_each_entry(sev, &ctrl->ev_subs, node)
1256 if (sev->fh != fh ||
1257 (sev->flags & V4L2_EVENT_SUB_FL_ALLOW_FEEDBACK))
1258 v4l2_event_queue_fh(sev->fh, &ev);
1259 }
1260
1261 static bool std_equal(const struct v4l2_ctrl *ctrl, u32 idx,
1262 union v4l2_ctrl_ptr ptr1,
1263 union v4l2_ctrl_ptr ptr2)
1264 {
1265 switch (ctrl->type) {
1266 case V4L2_CTRL_TYPE_BUTTON:
1267 return false;
1268 case V4L2_CTRL_TYPE_STRING:
1269 idx *= ctrl->elem_size;
1270 /* strings are always 0-terminated */
1271 return !strcmp(ptr1.p_char + idx, ptr2.p_char + idx);
1272 case V4L2_CTRL_TYPE_INTEGER64:
1273 return ptr1.p_s64[idx] == ptr2.p_s64[idx];
1274 case V4L2_CTRL_TYPE_U8:
1275 return ptr1.p_u8[idx] == ptr2.p_u8[idx];
1276 case V4L2_CTRL_TYPE_U16:
1277 return ptr1.p_u16[idx] == ptr2.p_u16[idx];
1278 case V4L2_CTRL_TYPE_U32:
1279 return ptr1.p_u32[idx] == ptr2.p_u32[idx];
1280 default:
1281 if (ctrl->is_int)
1282 return ptr1.p_s32[idx] == ptr2.p_s32[idx];
1283 idx *= ctrl->elem_size;
1284 return !memcmp(ptr1.p + idx, ptr2.p + idx, ctrl->elem_size);
1285 }
1286 }
1287
1288 static void std_init(const struct v4l2_ctrl *ctrl, u32 idx,
1289 union v4l2_ctrl_ptr ptr)
1290 {
1291 switch (ctrl->type) {
1292 case V4L2_CTRL_TYPE_STRING:
1293 idx *= ctrl->elem_size;
1294 memset(ptr.p_char + idx, ' ', ctrl->minimum);
1295 ptr.p_char[idx + ctrl->minimum] = '\0';
1296 break;
1297 case V4L2_CTRL_TYPE_INTEGER64:
1298 ptr.p_s64[idx] = ctrl->default_value;
1299 break;
1300 case V4L2_CTRL_TYPE_INTEGER:
1301 case V4L2_CTRL_TYPE_INTEGER_MENU:
1302 case V4L2_CTRL_TYPE_MENU:
1303 case V4L2_CTRL_TYPE_BITMASK:
1304 case V4L2_CTRL_TYPE_BOOLEAN:
1305 ptr.p_s32[idx] = ctrl->default_value;
1306 break;
1307 case V4L2_CTRL_TYPE_U8:
1308 ptr.p_u8[idx] = ctrl->default_value;
1309 break;
1310 case V4L2_CTRL_TYPE_U16:
1311 ptr.p_u16[idx] = ctrl->default_value;
1312 break;
1313 case V4L2_CTRL_TYPE_U32:
1314 ptr.p_u32[idx] = ctrl->default_value;
1315 break;
1316 default:
1317 idx *= ctrl->elem_size;
1318 memset(ptr.p + idx, 0, ctrl->elem_size);
1319 break;
1320 }
1321 }
1322
1323 static void std_log(const struct v4l2_ctrl *ctrl)
1324 {
1325 union v4l2_ctrl_ptr ptr = ctrl->p_cur;
1326
1327 if (ctrl->is_array) {
1328 unsigned i;
1329
1330 for (i = 0; i < ctrl->nr_of_dims; i++)
1331 pr_cont("[%u]", ctrl->dims[i]);
1332 pr_cont(" ");
1333 }
1334
1335 switch (ctrl->type) {
1336 case V4L2_CTRL_TYPE_INTEGER:
1337 pr_cont("%d", *ptr.p_s32);
1338 break;
1339 case V4L2_CTRL_TYPE_BOOLEAN:
1340 pr_cont("%s", *ptr.p_s32 ? "true" : "false");
1341 break;
1342 case V4L2_CTRL_TYPE_MENU:
1343 pr_cont("%s", ctrl->qmenu[*ptr.p_s32]);
1344 break;
1345 case V4L2_CTRL_TYPE_INTEGER_MENU:
1346 pr_cont("%lld", ctrl->qmenu_int[*ptr.p_s32]);
1347 break;
1348 case V4L2_CTRL_TYPE_BITMASK:
1349 pr_cont("0x%08x", *ptr.p_s32);
1350 break;
1351 case V4L2_CTRL_TYPE_INTEGER64:
1352 pr_cont("%lld", *ptr.p_s64);
1353 break;
1354 case V4L2_CTRL_TYPE_STRING:
1355 pr_cont("%s", ptr.p_char);
1356 break;
1357 case V4L2_CTRL_TYPE_U8:
1358 pr_cont("%u", (unsigned)*ptr.p_u8);
1359 break;
1360 case V4L2_CTRL_TYPE_U16:
1361 pr_cont("%u", (unsigned)*ptr.p_u16);
1362 break;
1363 case V4L2_CTRL_TYPE_U32:
1364 pr_cont("%u", (unsigned)*ptr.p_u32);
1365 break;
1366 default:
1367 pr_cont("unknown type %d", ctrl->type);
1368 break;
1369 }
1370 }
1371
1372 /*
1373 * Round towards the closest legal value. Be careful when we are
1374 * close to the maximum range of the control type to prevent
1375 * wrap-arounds.
1376 */
1377 #define ROUND_TO_RANGE(val, offset_type, ctrl) \
1378 ({ \
1379 offset_type offset; \
1380 if ((ctrl)->maximum >= 0 && \
1381 val >= (ctrl)->maximum - (s32)((ctrl)->step / 2)) \
1382 val = (ctrl)->maximum; \
1383 else \
1384 val += (s32)((ctrl)->step / 2); \
1385 val = clamp_t(typeof(val), val, \
1386 (ctrl)->minimum, (ctrl)->maximum); \
1387 offset = (val) - (ctrl)->minimum; \
1388 offset = (ctrl)->step * (offset / (u32)(ctrl)->step); \
1389 val = (ctrl)->minimum + offset; \
1390 0; \
1391 })
1392
1393 /* Validate a new control */
1394 static int std_validate(const struct v4l2_ctrl *ctrl, u32 idx,
1395 union v4l2_ctrl_ptr ptr)
1396 {
1397 size_t len;
1398 u64 offset;
1399 s64 val;
1400
1401 switch (ctrl->type) {
1402 case V4L2_CTRL_TYPE_INTEGER:
1403 return ROUND_TO_RANGE(ptr.p_s32[idx], u32, ctrl);
1404 case V4L2_CTRL_TYPE_INTEGER64:
1405 /*
1406 * We can't use the ROUND_TO_RANGE define here due to
1407 * the u64 divide that needs special care.
1408 */
1409 val = ptr.p_s64[idx];
1410 if (ctrl->maximum >= 0 && val >= ctrl->maximum - (s64)(ctrl->step / 2))
1411 val = ctrl->maximum;
1412 else
1413 val += (s64)(ctrl->step / 2);
1414 val = clamp_t(s64, val, ctrl->minimum, ctrl->maximum);
1415 offset = val - ctrl->minimum;
1416 do_div(offset, ctrl->step);
1417 ptr.p_s64[idx] = ctrl->minimum + offset * ctrl->step;
1418 return 0;
1419 case V4L2_CTRL_TYPE_U8:
1420 return ROUND_TO_RANGE(ptr.p_u8[idx], u8, ctrl);
1421 case V4L2_CTRL_TYPE_U16:
1422 return ROUND_TO_RANGE(ptr.p_u16[idx], u16, ctrl);
1423 case V4L2_CTRL_TYPE_U32:
1424 return ROUND_TO_RANGE(ptr.p_u32[idx], u32, ctrl);
1425
1426 case V4L2_CTRL_TYPE_BOOLEAN:
1427 ptr.p_s32[idx] = !!ptr.p_s32[idx];
1428 return 0;
1429
1430 case V4L2_CTRL_TYPE_MENU:
1431 case V4L2_CTRL_TYPE_INTEGER_MENU:
1432 if (ptr.p_s32[idx] < ctrl->minimum || ptr.p_s32[idx] > ctrl->maximum)
1433 return -ERANGE;
1434 if (ctrl->menu_skip_mask & (1 << ptr.p_s32[idx]))
1435 return -EINVAL;
1436 if (ctrl->type == V4L2_CTRL_TYPE_MENU &&
1437 ctrl->qmenu[ptr.p_s32[idx]][0] == '\0')
1438 return -EINVAL;
1439 return 0;
1440
1441 case V4L2_CTRL_TYPE_BITMASK:
1442 ptr.p_s32[idx] &= ctrl->maximum;
1443 return 0;
1444
1445 case V4L2_CTRL_TYPE_BUTTON:
1446 case V4L2_CTRL_TYPE_CTRL_CLASS:
1447 ptr.p_s32[idx] = 0;
1448 return 0;
1449
1450 case V4L2_CTRL_TYPE_STRING:
1451 idx *= ctrl->elem_size;
1452 len = strlen(ptr.p_char + idx);
1453 if (len < ctrl->minimum)
1454 return -ERANGE;
1455 if ((len - (u32)ctrl->minimum) % (u32)ctrl->step)
1456 return -ERANGE;
1457 return 0;
1458
1459 default:
1460 return -EINVAL;
1461 }
1462 }
1463
1464 static const struct v4l2_ctrl_type_ops std_type_ops = {
1465 .equal = std_equal,
1466 .init = std_init,
1467 .log = std_log,
1468 .validate = std_validate,
1469 };
1470
1471 /* Helper function: copy the given control value back to the caller */
1472 static int ptr_to_user(struct v4l2_ext_control *c,
1473 struct v4l2_ctrl *ctrl,
1474 union v4l2_ctrl_ptr ptr)
1475 {
1476 u32 len;
1477
1478 if (ctrl->is_ptr && !ctrl->is_string)
1479 return copy_to_user(c->ptr, ptr.p, c->size) ?
1480 -EFAULT : 0;
1481
1482 switch (ctrl->type) {
1483 case V4L2_CTRL_TYPE_STRING:
1484 len = strlen(ptr.p_char);
1485 if (c->size < len + 1) {
1486 c->size = ctrl->elem_size;
1487 return -ENOSPC;
1488 }
1489 return copy_to_user(c->string, ptr.p_char, len + 1) ?
1490 -EFAULT : 0;
1491 case V4L2_CTRL_TYPE_INTEGER64:
1492 c->value64 = *ptr.p_s64;
1493 break;
1494 default:
1495 c->value = *ptr.p_s32;
1496 break;
1497 }
1498 return 0;
1499 }
1500
1501 /* Helper function: copy the current control value back to the caller */
1502 static int cur_to_user(struct v4l2_ext_control *c,
1503 struct v4l2_ctrl *ctrl)
1504 {
1505 return ptr_to_user(c, ctrl, ctrl->p_cur);
1506 }
1507
1508 /* Helper function: copy the new control value back to the caller */
1509 static int new_to_user(struct v4l2_ext_control *c,
1510 struct v4l2_ctrl *ctrl)
1511 {
1512 return ptr_to_user(c, ctrl, ctrl->p_new);
1513 }
1514
1515 /* Helper function: copy the initial control value back to the caller */
1516 static int def_to_user(struct v4l2_ext_control *c, struct v4l2_ctrl *ctrl)
1517 {
1518 int idx;
1519
1520 for (idx = 0; idx < ctrl->elems; idx++)
1521 ctrl->type_ops->init(ctrl, idx, ctrl->p_new);
1522
1523 return ptr_to_user(c, ctrl, ctrl->p_new);
1524 }
1525
1526 /* Helper function: copy the caller-provider value to the given control value */
1527 static int user_to_ptr(struct v4l2_ext_control *c,
1528 struct v4l2_ctrl *ctrl,
1529 union v4l2_ctrl_ptr ptr)
1530 {
1531 int ret;
1532 u32 size;
1533
1534 ctrl->is_new = 1;
1535 if (ctrl->is_ptr && !ctrl->is_string) {
1536 unsigned idx;
1537
1538 ret = copy_from_user(ptr.p, c->ptr, c->size) ? -EFAULT : 0;
1539 if (ret || !ctrl->is_array)
1540 return ret;
1541 for (idx = c->size / ctrl->elem_size; idx < ctrl->elems; idx++)
1542 ctrl->type_ops->init(ctrl, idx, ptr);
1543 return 0;
1544 }
1545
1546 switch (ctrl->type) {
1547 case V4L2_CTRL_TYPE_INTEGER64:
1548 *ptr.p_s64 = c->value64;
1549 break;
1550 case V4L2_CTRL_TYPE_STRING:
1551 size = c->size;
1552 if (size == 0)
1553 return -ERANGE;
1554 if (size > ctrl->maximum + 1)
1555 size = ctrl->maximum + 1;
1556 ret = copy_from_user(ptr.p_char, c->string, size) ? -EFAULT : 0;
1557 if (!ret) {
1558 char last = ptr.p_char[size - 1];
1559
1560 ptr.p_char[size - 1] = 0;
1561 /* If the string was longer than ctrl->maximum,
1562 then return an error. */
1563 if (strlen(ptr.p_char) == ctrl->maximum && last)
1564 return -ERANGE;
1565 }
1566 return ret;
1567 default:
1568 *ptr.p_s32 = c->value;
1569 break;
1570 }
1571 return 0;
1572 }
1573
1574 /* Helper function: copy the caller-provider value as the new control value */
1575 static int user_to_new(struct v4l2_ext_control *c,
1576 struct v4l2_ctrl *ctrl)
1577 {
1578 return user_to_ptr(c, ctrl, ctrl->p_new);
1579 }
1580
1581 /* Copy the one value to another. */
1582 static void ptr_to_ptr(struct v4l2_ctrl *ctrl,
1583 union v4l2_ctrl_ptr from, union v4l2_ctrl_ptr to)
1584 {
1585 if (ctrl == NULL)
1586 return;
1587 memcpy(to.p, from.p, ctrl->elems * ctrl->elem_size);
1588 }
1589
1590 /* Copy the new value to the current value. */
1591 static void new_to_cur(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, u32 ch_flags)
1592 {
1593 bool changed;
1594
1595 if (ctrl == NULL)
1596 return;
1597
1598 /* has_changed is set by cluster_changed */
1599 changed = ctrl->has_changed;
1600 if (changed)
1601 ptr_to_ptr(ctrl, ctrl->p_new, ctrl->p_cur);
1602
1603 if (ch_flags & V4L2_EVENT_CTRL_CH_FLAGS) {
1604 /* Note: CH_FLAGS is only set for auto clusters. */
1605 ctrl->flags &=
1606 ~(V4L2_CTRL_FLAG_INACTIVE | V4L2_CTRL_FLAG_VOLATILE);
1607 if (!is_cur_manual(ctrl->cluster[0])) {
1608 ctrl->flags |= V4L2_CTRL_FLAG_INACTIVE;
1609 if (ctrl->cluster[0]->has_volatiles)
1610 ctrl->flags |= V4L2_CTRL_FLAG_VOLATILE;
1611 }
1612 fh = NULL;
1613 }
1614 if (changed || ch_flags) {
1615 /* If a control was changed that was not one of the controls
1616 modified by the application, then send the event to all. */
1617 if (!ctrl->is_new)
1618 fh = NULL;
1619 send_event(fh, ctrl,
1620 (changed ? V4L2_EVENT_CTRL_CH_VALUE : 0) | ch_flags);
1621 if (ctrl->call_notify && changed && ctrl->handler->notify)
1622 ctrl->handler->notify(ctrl, ctrl->handler->notify_priv);
1623 }
1624 }
1625
1626 /* Copy the current value to the new value */
1627 static void cur_to_new(struct v4l2_ctrl *ctrl)
1628 {
1629 if (ctrl == NULL)
1630 return;
1631 ptr_to_ptr(ctrl, ctrl->p_cur, ctrl->p_new);
1632 }
1633
1634 /* Return non-zero if one or more of the controls in the cluster has a new
1635 value that differs from the current value. */
1636 static int cluster_changed(struct v4l2_ctrl *master)
1637 {
1638 bool changed = false;
1639 unsigned idx;
1640 int i;
1641
1642 for (i = 0; i < master->ncontrols; i++) {
1643 struct v4l2_ctrl *ctrl = master->cluster[i];
1644 bool ctrl_changed = false;
1645
1646 if (ctrl == NULL)
1647 continue;
1648
1649 if (ctrl->flags & V4L2_CTRL_FLAG_EXECUTE_ON_WRITE)
1650 changed = ctrl_changed = true;
1651
1652 /*
1653 * Set has_changed to false to avoid generating
1654 * the event V4L2_EVENT_CTRL_CH_VALUE
1655 */
1656 if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE) {
1657 ctrl->has_changed = false;
1658 continue;
1659 }
1660
1661 for (idx = 0; !ctrl_changed && idx < ctrl->elems; idx++)
1662 ctrl_changed = !ctrl->type_ops->equal(ctrl, idx,
1663 ctrl->p_cur, ctrl->p_new);
1664 ctrl->has_changed = ctrl_changed;
1665 changed |= ctrl->has_changed;
1666 }
1667 return changed;
1668 }
1669
1670 /* Control range checking */
1671 static int check_range(enum v4l2_ctrl_type type,
1672 s64 min, s64 max, u64 step, s64 def)
1673 {
1674 switch (type) {
1675 case V4L2_CTRL_TYPE_BOOLEAN:
1676 if (step != 1 || max > 1 || min < 0)
1677 return -ERANGE;
1678 /* fall through */
1679 case V4L2_CTRL_TYPE_U8:
1680 case V4L2_CTRL_TYPE_U16:
1681 case V4L2_CTRL_TYPE_U32:
1682 case V4L2_CTRL_TYPE_INTEGER:
1683 case V4L2_CTRL_TYPE_INTEGER64:
1684 if (step == 0 || min > max || def < min || def > max)
1685 return -ERANGE;
1686 return 0;
1687 case V4L2_CTRL_TYPE_BITMASK:
1688 if (step || min || !max || (def & ~max))
1689 return -ERANGE;
1690 return 0;
1691 case V4L2_CTRL_TYPE_MENU:
1692 case V4L2_CTRL_TYPE_INTEGER_MENU:
1693 if (min > max || def < min || def > max)
1694 return -ERANGE;
1695 /* Note: step == menu_skip_mask for menu controls.
1696 So here we check if the default value is masked out. */
1697 if (step && ((1 << def) & step))
1698 return -EINVAL;
1699 return 0;
1700 case V4L2_CTRL_TYPE_STRING:
1701 if (min > max || min < 0 || step < 1 || def)
1702 return -ERANGE;
1703 return 0;
1704 default:
1705 return 0;
1706 }
1707 }
1708
1709 /* Validate a new control */
1710 static int validate_new(const struct v4l2_ctrl *ctrl, union v4l2_ctrl_ptr p_new)
1711 {
1712 unsigned idx;
1713 int err = 0;
1714
1715 for (idx = 0; !err && idx < ctrl->elems; idx++)
1716 err = ctrl->type_ops->validate(ctrl, idx, p_new);
1717 return err;
1718 }
1719
1720 static inline u32 node2id(struct list_head *node)
1721 {
1722 return list_entry(node, struct v4l2_ctrl_ref, node)->ctrl->id;
1723 }
1724
1725 /* Set the handler's error code if it wasn't set earlier already */
1726 static inline int handler_set_err(struct v4l2_ctrl_handler *hdl, int err)
1727 {
1728 if (hdl->error == 0)
1729 hdl->error = err;
1730 return err;
1731 }
1732
1733 /* Initialize the handler */
1734 int v4l2_ctrl_handler_init_class(struct v4l2_ctrl_handler *hdl,
1735 unsigned nr_of_controls_hint,
1736 struct lock_class_key *key, const char *name)
1737 {
1738 hdl->lock = &hdl->_lock;
1739 mutex_init(hdl->lock);
1740 lockdep_set_class_and_name(hdl->lock, key, name);
1741 INIT_LIST_HEAD(&hdl->ctrls);
1742 INIT_LIST_HEAD(&hdl->ctrl_refs);
1743 hdl->nr_of_buckets = 1 + nr_of_controls_hint / 8;
1744 hdl->buckets = kcalloc(hdl->nr_of_buckets, sizeof(hdl->buckets[0]),
1745 GFP_KERNEL);
1746 hdl->error = hdl->buckets ? 0 : -ENOMEM;
1747 return hdl->error;
1748 }
1749 EXPORT_SYMBOL(v4l2_ctrl_handler_init_class);
1750
1751 /* Free all controls and control refs */
1752 void v4l2_ctrl_handler_free(struct v4l2_ctrl_handler *hdl)
1753 {
1754 struct v4l2_ctrl_ref *ref, *next_ref;
1755 struct v4l2_ctrl *ctrl, *next_ctrl;
1756 struct v4l2_subscribed_event *sev, *next_sev;
1757
1758 if (hdl == NULL || hdl->buckets == NULL)
1759 return;
1760
1761 mutex_lock(hdl->lock);
1762 /* Free all nodes */
1763 list_for_each_entry_safe(ref, next_ref, &hdl->ctrl_refs, node) {
1764 list_del(&ref->node);
1765 kfree(ref);
1766 }
1767 /* Free all controls owned by the handler */
1768 list_for_each_entry_safe(ctrl, next_ctrl, &hdl->ctrls, node) {
1769 list_del(&ctrl->node);
1770 list_for_each_entry_safe(sev, next_sev, &ctrl->ev_subs, node)
1771 list_del(&sev->node);
1772 kfree(ctrl);
1773 }
1774 kfree(hdl->buckets);
1775 hdl->buckets = NULL;
1776 hdl->cached = NULL;
1777 hdl->error = 0;
1778 mutex_unlock(hdl->lock);
1779 }
1780 EXPORT_SYMBOL(v4l2_ctrl_handler_free);
1781
1782 /* For backwards compatibility: V4L2_CID_PRIVATE_BASE should no longer
1783 be used except in G_CTRL, S_CTRL, QUERYCTRL and QUERYMENU when dealing
1784 with applications that do not use the NEXT_CTRL flag.
1785
1786 We just find the n-th private user control. It's O(N), but that should not
1787 be an issue in this particular case. */
1788 static struct v4l2_ctrl_ref *find_private_ref(
1789 struct v4l2_ctrl_handler *hdl, u32 id)
1790 {
1791 struct v4l2_ctrl_ref *ref;
1792
1793 id -= V4L2_CID_PRIVATE_BASE;
1794 list_for_each_entry(ref, &hdl->ctrl_refs, node) {
1795 /* Search for private user controls that are compatible with
1796 VIDIOC_G/S_CTRL. */
1797 if (V4L2_CTRL_ID2WHICH(ref->ctrl->id) == V4L2_CTRL_CLASS_USER &&
1798 V4L2_CTRL_DRIVER_PRIV(ref->ctrl->id)) {
1799 if (!ref->ctrl->is_int)
1800 continue;
1801 if (id == 0)
1802 return ref;
1803 id--;
1804 }
1805 }
1806 return NULL;
1807 }
1808
1809 /* Find a control with the given ID. */
1810 static struct v4l2_ctrl_ref *find_ref(struct v4l2_ctrl_handler *hdl, u32 id)
1811 {
1812 struct v4l2_ctrl_ref *ref;
1813 int bucket;
1814
1815 id &= V4L2_CTRL_ID_MASK;
1816
1817 /* Old-style private controls need special handling */
1818 if (id >= V4L2_CID_PRIVATE_BASE)
1819 return find_private_ref(hdl, id);
1820 bucket = id % hdl->nr_of_buckets;
1821
1822 /* Simple optimization: cache the last control found */
1823 if (hdl->cached && hdl->cached->ctrl->id == id)
1824 return hdl->cached;
1825
1826 /* Not in cache, search the hash */
1827 ref = hdl->buckets ? hdl->buckets[bucket] : NULL;
1828 while (ref && ref->ctrl->id != id)
1829 ref = ref->next;
1830
1831 if (ref)
1832 hdl->cached = ref; /* cache it! */
1833 return ref;
1834 }
1835
1836 /* Find a control with the given ID. Take the handler's lock first. */
1837 static struct v4l2_ctrl_ref *find_ref_lock(
1838 struct v4l2_ctrl_handler *hdl, u32 id)
1839 {
1840 struct v4l2_ctrl_ref *ref = NULL;
1841
1842 if (hdl) {
1843 mutex_lock(hdl->lock);
1844 ref = find_ref(hdl, id);
1845 mutex_unlock(hdl->lock);
1846 }
1847 return ref;
1848 }
1849
1850 /* Find a control with the given ID. */
1851 struct v4l2_ctrl *v4l2_ctrl_find(struct v4l2_ctrl_handler *hdl, u32 id)
1852 {
1853 struct v4l2_ctrl_ref *ref = find_ref_lock(hdl, id);
1854
1855 return ref ? ref->ctrl : NULL;
1856 }
1857 EXPORT_SYMBOL(v4l2_ctrl_find);
1858
1859 /* Allocate a new v4l2_ctrl_ref and hook it into the handler. */
1860 static int handler_new_ref(struct v4l2_ctrl_handler *hdl,
1861 struct v4l2_ctrl *ctrl)
1862 {
1863 struct v4l2_ctrl_ref *ref;
1864 struct v4l2_ctrl_ref *new_ref;
1865 u32 id = ctrl->id;
1866 u32 class_ctrl = V4L2_CTRL_ID2WHICH(id) | 1;
1867 int bucket = id % hdl->nr_of_buckets; /* which bucket to use */
1868
1869 /*
1870 * Automatically add the control class if it is not yet present and
1871 * the new control is not a compound control.
1872 */
1873 if (ctrl->type < V4L2_CTRL_COMPOUND_TYPES &&
1874 id != class_ctrl && find_ref_lock(hdl, class_ctrl) == NULL)
1875 if (!v4l2_ctrl_new_std(hdl, NULL, class_ctrl, 0, 0, 0, 0))
1876 return hdl->error;
1877
1878 if (hdl->error)
1879 return hdl->error;
1880
1881 new_ref = kzalloc(sizeof(*new_ref), GFP_KERNEL);
1882 if (!new_ref)
1883 return handler_set_err(hdl, -ENOMEM);
1884 new_ref->ctrl = ctrl;
1885 if (ctrl->handler == hdl) {
1886 /* By default each control starts in a cluster of its own.
1887 new_ref->ctrl is basically a cluster array with one
1888 element, so that's perfect to use as the cluster pointer.
1889 But only do this for the handler that owns the control. */
1890 ctrl->cluster = &new_ref->ctrl;
1891 ctrl->ncontrols = 1;
1892 }
1893
1894 INIT_LIST_HEAD(&new_ref->node);
1895
1896 mutex_lock(hdl->lock);
1897
1898 /* Add immediately at the end of the list if the list is empty, or if
1899 the last element in the list has a lower ID.
1900 This ensures that when elements are added in ascending order the
1901 insertion is an O(1) operation. */
1902 if (list_empty(&hdl->ctrl_refs) || id > node2id(hdl->ctrl_refs.prev)) {
1903 list_add_tail(&new_ref->node, &hdl->ctrl_refs);
1904 goto insert_in_hash;
1905 }
1906
1907 /* Find insert position in sorted list */
1908 list_for_each_entry(ref, &hdl->ctrl_refs, node) {
1909 if (ref->ctrl->id < id)
1910 continue;
1911 /* Don't add duplicates */
1912 if (ref->ctrl->id == id) {
1913 kfree(new_ref);
1914 goto unlock;
1915 }
1916 list_add(&new_ref->node, ref->node.prev);
1917 break;
1918 }
1919
1920 insert_in_hash:
1921 /* Insert the control node in the hash */
1922 new_ref->next = hdl->buckets[bucket];
1923 hdl->buckets[bucket] = new_ref;
1924
1925 unlock:
1926 mutex_unlock(hdl->lock);
1927 return 0;
1928 }
1929
1930 /* Add a new control */
1931 static struct v4l2_ctrl *v4l2_ctrl_new(struct v4l2_ctrl_handler *hdl,
1932 const struct v4l2_ctrl_ops *ops,
1933 const struct v4l2_ctrl_type_ops *type_ops,
1934 u32 id, const char *name, enum v4l2_ctrl_type type,
1935 s64 min, s64 max, u64 step, s64 def,
1936 const u32 dims[V4L2_CTRL_MAX_DIMS], u32 elem_size,
1937 u32 flags, const char * const *qmenu,
1938 const s64 *qmenu_int, void *priv)
1939 {
1940 struct v4l2_ctrl *ctrl;
1941 unsigned sz_extra;
1942 unsigned nr_of_dims = 0;
1943 unsigned elems = 1;
1944 bool is_array;
1945 unsigned tot_ctrl_size;
1946 unsigned idx;
1947 void *data;
1948 int err;
1949
1950 if (hdl->error)
1951 return NULL;
1952
1953 while (dims && dims[nr_of_dims]) {
1954 elems *= dims[nr_of_dims];
1955 nr_of_dims++;
1956 if (nr_of_dims == V4L2_CTRL_MAX_DIMS)
1957 break;
1958 }
1959 is_array = nr_of_dims > 0;
1960
1961 /* Prefill elem_size for all types handled by std_type_ops */
1962 switch (type) {
1963 case V4L2_CTRL_TYPE_INTEGER64:
1964 elem_size = sizeof(s64);
1965 break;
1966 case V4L2_CTRL_TYPE_STRING:
1967 elem_size = max + 1;
1968 break;
1969 case V4L2_CTRL_TYPE_U8:
1970 elem_size = sizeof(u8);
1971 break;
1972 case V4L2_CTRL_TYPE_U16:
1973 elem_size = sizeof(u16);
1974 break;
1975 case V4L2_CTRL_TYPE_U32:
1976 elem_size = sizeof(u32);
1977 break;
1978 default:
1979 if (type < V4L2_CTRL_COMPOUND_TYPES)
1980 elem_size = sizeof(s32);
1981 break;
1982 }
1983 tot_ctrl_size = elem_size * elems;
1984
1985 /* Sanity checks */
1986 if (id == 0 || name == NULL || !elem_size ||
1987 id >= V4L2_CID_PRIVATE_BASE ||
1988 (type == V4L2_CTRL_TYPE_MENU && qmenu == NULL) ||
1989 (type == V4L2_CTRL_TYPE_INTEGER_MENU && qmenu_int == NULL)) {
1990 handler_set_err(hdl, -ERANGE);
1991 return NULL;
1992 }
1993 err = check_range(type, min, max, step, def);
1994 if (err) {
1995 handler_set_err(hdl, err);
1996 return NULL;
1997 }
1998 if (type == V4L2_CTRL_TYPE_BITMASK && ((def & ~max) || min || step)) {
1999 handler_set_err(hdl, -ERANGE);
2000 return NULL;
2001 }
2002 if (is_array &&
2003 (type == V4L2_CTRL_TYPE_BUTTON ||
2004 type == V4L2_CTRL_TYPE_CTRL_CLASS)) {
2005 handler_set_err(hdl, -EINVAL);
2006 return NULL;
2007 }
2008
2009 sz_extra = 0;
2010 if (type == V4L2_CTRL_TYPE_BUTTON)
2011 flags |= V4L2_CTRL_FLAG_WRITE_ONLY |
2012 V4L2_CTRL_FLAG_EXECUTE_ON_WRITE;
2013 else if (type == V4L2_CTRL_TYPE_CTRL_CLASS)
2014 flags |= V4L2_CTRL_FLAG_READ_ONLY;
2015 else if (type == V4L2_CTRL_TYPE_INTEGER64 ||
2016 type == V4L2_CTRL_TYPE_STRING ||
2017 type >= V4L2_CTRL_COMPOUND_TYPES ||
2018 is_array)
2019 sz_extra += 2 * tot_ctrl_size;
2020
2021 ctrl = kzalloc(sizeof(*ctrl) + sz_extra, GFP_KERNEL);
2022 if (ctrl == NULL) {
2023 handler_set_err(hdl, -ENOMEM);
2024 return NULL;
2025 }
2026
2027 INIT_LIST_HEAD(&ctrl->node);
2028 INIT_LIST_HEAD(&ctrl->ev_subs);
2029 ctrl->handler = hdl;
2030 ctrl->ops = ops;
2031 ctrl->type_ops = type_ops ? type_ops : &std_type_ops;
2032 ctrl->id = id;
2033 ctrl->name = name;
2034 ctrl->type = type;
2035 ctrl->flags = flags;
2036 ctrl->minimum = min;
2037 ctrl->maximum = max;
2038 ctrl->step = step;
2039 ctrl->default_value = def;
2040 ctrl->is_string = !is_array && type == V4L2_CTRL_TYPE_STRING;
2041 ctrl->is_ptr = is_array || type >= V4L2_CTRL_COMPOUND_TYPES || ctrl->is_string;
2042 ctrl->is_int = !ctrl->is_ptr && type != V4L2_CTRL_TYPE_INTEGER64;
2043 ctrl->is_array = is_array;
2044 ctrl->elems = elems;
2045 ctrl->nr_of_dims = nr_of_dims;
2046 if (nr_of_dims)
2047 memcpy(ctrl->dims, dims, nr_of_dims * sizeof(dims[0]));
2048 ctrl->elem_size = elem_size;
2049 if (type == V4L2_CTRL_TYPE_MENU)
2050 ctrl->qmenu = qmenu;
2051 else if (type == V4L2_CTRL_TYPE_INTEGER_MENU)
2052 ctrl->qmenu_int = qmenu_int;
2053 ctrl->priv = priv;
2054 ctrl->cur.val = ctrl->val = def;
2055 data = &ctrl[1];
2056
2057 if (!ctrl->is_int) {
2058 ctrl->p_new.p = data;
2059 ctrl->p_cur.p = data + tot_ctrl_size;
2060 } else {
2061 ctrl->p_new.p = &ctrl->val;
2062 ctrl->p_cur.p = &ctrl->cur.val;
2063 }
2064 for (idx = 0; idx < elems; idx++) {
2065 ctrl->type_ops->init(ctrl, idx, ctrl->p_cur);
2066 ctrl->type_ops->init(ctrl, idx, ctrl->p_new);
2067 }
2068
2069 if (handler_new_ref(hdl, ctrl)) {
2070 kfree(ctrl);
2071 return NULL;
2072 }
2073 mutex_lock(hdl->lock);
2074 list_add_tail(&ctrl->node, &hdl->ctrls);
2075 mutex_unlock(hdl->lock);
2076 return ctrl;
2077 }
2078
2079 struct v4l2_ctrl *v4l2_ctrl_new_custom(struct v4l2_ctrl_handler *hdl,
2080 const struct v4l2_ctrl_config *cfg, void *priv)
2081 {
2082 bool is_menu;
2083 struct v4l2_ctrl *ctrl;
2084 const char *name = cfg->name;
2085 const char * const *qmenu = cfg->qmenu;
2086 const s64 *qmenu_int = cfg->qmenu_int;
2087 enum v4l2_ctrl_type type = cfg->type;
2088 u32 flags = cfg->flags;
2089 s64 min = cfg->min;
2090 s64 max = cfg->max;
2091 u64 step = cfg->step;
2092 s64 def = cfg->def;
2093
2094 if (name == NULL)
2095 v4l2_ctrl_fill(cfg->id, &name, &type, &min, &max, &step,
2096 &def, &flags);
2097
2098 is_menu = (cfg->type == V4L2_CTRL_TYPE_MENU ||
2099 cfg->type == V4L2_CTRL_TYPE_INTEGER_MENU);
2100 if (is_menu)
2101 WARN_ON(step);
2102 else
2103 WARN_ON(cfg->menu_skip_mask);
2104 if (cfg->type == V4L2_CTRL_TYPE_MENU && qmenu == NULL)
2105 qmenu = v4l2_ctrl_get_menu(cfg->id);
2106 else if (cfg->type == V4L2_CTRL_TYPE_INTEGER_MENU &&
2107 qmenu_int == NULL) {
2108 handler_set_err(hdl, -EINVAL);
2109 return NULL;
2110 }
2111
2112 ctrl = v4l2_ctrl_new(hdl, cfg->ops, cfg->type_ops, cfg->id, name,
2113 type, min, max,
2114 is_menu ? cfg->menu_skip_mask : step, def,
2115 cfg->dims, cfg->elem_size,
2116 flags, qmenu, qmenu_int, priv);
2117 if (ctrl)
2118 ctrl->is_private = cfg->is_private;
2119 return ctrl;
2120 }
2121 EXPORT_SYMBOL(v4l2_ctrl_new_custom);
2122
2123 /* Helper function for standard non-menu controls */
2124 struct v4l2_ctrl *v4l2_ctrl_new_std(struct v4l2_ctrl_handler *hdl,
2125 const struct v4l2_ctrl_ops *ops,
2126 u32 id, s64 min, s64 max, u64 step, s64 def)
2127 {
2128 const char *name;
2129 enum v4l2_ctrl_type type;
2130 u32 flags;
2131
2132 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
2133 if (type == V4L2_CTRL_TYPE_MENU ||
2134 type == V4L2_CTRL_TYPE_INTEGER_MENU ||
2135 type >= V4L2_CTRL_COMPOUND_TYPES) {
2136 handler_set_err(hdl, -EINVAL);
2137 return NULL;
2138 }
2139 return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
2140 min, max, step, def, NULL, 0,
2141 flags, NULL, NULL, NULL);
2142 }
2143 EXPORT_SYMBOL(v4l2_ctrl_new_std);
2144
2145 /* Helper function for standard menu controls */
2146 struct v4l2_ctrl *v4l2_ctrl_new_std_menu(struct v4l2_ctrl_handler *hdl,
2147 const struct v4l2_ctrl_ops *ops,
2148 u32 id, u8 _max, u64 mask, u8 _def)
2149 {
2150 const char * const *qmenu = NULL;
2151 const s64 *qmenu_int = NULL;
2152 unsigned int qmenu_int_len = 0;
2153 const char *name;
2154 enum v4l2_ctrl_type type;
2155 s64 min;
2156 s64 max = _max;
2157 s64 def = _def;
2158 u64 step;
2159 u32 flags;
2160
2161 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
2162
2163 if (type == V4L2_CTRL_TYPE_MENU)
2164 qmenu = v4l2_ctrl_get_menu(id);
2165 else if (type == V4L2_CTRL_TYPE_INTEGER_MENU)
2166 qmenu_int = v4l2_ctrl_get_int_menu(id, &qmenu_int_len);
2167
2168 if ((!qmenu && !qmenu_int) || (qmenu_int && max > qmenu_int_len)) {
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, qmenu_int, NULL);
2175 }
2176 EXPORT_SYMBOL(v4l2_ctrl_new_std_menu);
2177
2178 /* Helper function for standard menu controls with driver defined menu */
2179 struct v4l2_ctrl *v4l2_ctrl_new_std_menu_items(struct v4l2_ctrl_handler *hdl,
2180 const struct v4l2_ctrl_ops *ops, u32 id, u8 _max,
2181 u64 mask, u8 _def, const char * const *qmenu)
2182 {
2183 enum v4l2_ctrl_type type;
2184 const char *name;
2185 u32 flags;
2186 u64 step;
2187 s64 min;
2188 s64 max = _max;
2189 s64 def = _def;
2190
2191 /* v4l2_ctrl_new_std_menu_items() should only be called for
2192 * standard controls without a standard menu.
2193 */
2194 if (v4l2_ctrl_get_menu(id)) {
2195 handler_set_err(hdl, -EINVAL);
2196 return NULL;
2197 }
2198
2199 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
2200 if (type != V4L2_CTRL_TYPE_MENU || qmenu == NULL) {
2201 handler_set_err(hdl, -EINVAL);
2202 return NULL;
2203 }
2204 return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
2205 0, max, mask, def, NULL, 0,
2206 flags, qmenu, NULL, NULL);
2207
2208 }
2209 EXPORT_SYMBOL(v4l2_ctrl_new_std_menu_items);
2210
2211 /* Helper function for standard integer menu controls */
2212 struct v4l2_ctrl *v4l2_ctrl_new_int_menu(struct v4l2_ctrl_handler *hdl,
2213 const struct v4l2_ctrl_ops *ops,
2214 u32 id, u8 _max, u8 _def, const s64 *qmenu_int)
2215 {
2216 const char *name;
2217 enum v4l2_ctrl_type type;
2218 s64 min;
2219 u64 step;
2220 s64 max = _max;
2221 s64 def = _def;
2222 u32 flags;
2223
2224 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
2225 if (type != V4L2_CTRL_TYPE_INTEGER_MENU) {
2226 handler_set_err(hdl, -EINVAL);
2227 return NULL;
2228 }
2229 return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
2230 0, max, 0, def, NULL, 0,
2231 flags, NULL, qmenu_int, NULL);
2232 }
2233 EXPORT_SYMBOL(v4l2_ctrl_new_int_menu);
2234
2235 /* Add the controls from another handler to our own. */
2236 int v4l2_ctrl_add_handler(struct v4l2_ctrl_handler *hdl,
2237 struct v4l2_ctrl_handler *add,
2238 bool (*filter)(const struct v4l2_ctrl *ctrl))
2239 {
2240 struct v4l2_ctrl_ref *ref;
2241 int ret = 0;
2242
2243 /* Do nothing if either handler is NULL or if they are the same */
2244 if (!hdl || !add || hdl == add)
2245 return 0;
2246 if (hdl->error)
2247 return hdl->error;
2248 mutex_lock(add->lock);
2249 list_for_each_entry(ref, &add->ctrl_refs, node) {
2250 struct v4l2_ctrl *ctrl = ref->ctrl;
2251
2252 /* Skip handler-private controls. */
2253 if (ctrl->is_private)
2254 continue;
2255 /* And control classes */
2256 if (ctrl->type == V4L2_CTRL_TYPE_CTRL_CLASS)
2257 continue;
2258 /* Filter any unwanted controls */
2259 if (filter && !filter(ctrl))
2260 continue;
2261 ret = handler_new_ref(hdl, ctrl);
2262 if (ret)
2263 break;
2264 }
2265 mutex_unlock(add->lock);
2266 return ret;
2267 }
2268 EXPORT_SYMBOL(v4l2_ctrl_add_handler);
2269
2270 bool v4l2_ctrl_radio_filter(const struct v4l2_ctrl *ctrl)
2271 {
2272 if (V4L2_CTRL_ID2WHICH(ctrl->id) == V4L2_CTRL_CLASS_FM_TX)
2273 return true;
2274 if (V4L2_CTRL_ID2WHICH(ctrl->id) == V4L2_CTRL_CLASS_FM_RX)
2275 return true;
2276 switch (ctrl->id) {
2277 case V4L2_CID_AUDIO_MUTE:
2278 case V4L2_CID_AUDIO_VOLUME:
2279 case V4L2_CID_AUDIO_BALANCE:
2280 case V4L2_CID_AUDIO_BASS:
2281 case V4L2_CID_AUDIO_TREBLE:
2282 case V4L2_CID_AUDIO_LOUDNESS:
2283 return true;
2284 default:
2285 break;
2286 }
2287 return false;
2288 }
2289 EXPORT_SYMBOL(v4l2_ctrl_radio_filter);
2290
2291 /* Cluster controls */
2292 void v4l2_ctrl_cluster(unsigned ncontrols, struct v4l2_ctrl **controls)
2293 {
2294 bool has_volatiles = false;
2295 int i;
2296
2297 /* The first control is the master control and it must not be NULL */
2298 if (WARN_ON(ncontrols == 0 || controls[0] == NULL))
2299 return;
2300
2301 for (i = 0; i < ncontrols; i++) {
2302 if (controls[i]) {
2303 controls[i]->cluster = controls;
2304 controls[i]->ncontrols = ncontrols;
2305 if (controls[i]->flags & V4L2_CTRL_FLAG_VOLATILE)
2306 has_volatiles = true;
2307 }
2308 }
2309 controls[0]->has_volatiles = has_volatiles;
2310 }
2311 EXPORT_SYMBOL(v4l2_ctrl_cluster);
2312
2313 void v4l2_ctrl_auto_cluster(unsigned ncontrols, struct v4l2_ctrl **controls,
2314 u8 manual_val, bool set_volatile)
2315 {
2316 struct v4l2_ctrl *master = controls[0];
2317 u32 flag = 0;
2318 int i;
2319
2320 v4l2_ctrl_cluster(ncontrols, controls);
2321 WARN_ON(ncontrols <= 1);
2322 WARN_ON(manual_val < master->minimum || manual_val > master->maximum);
2323 WARN_ON(set_volatile && !has_op(master, g_volatile_ctrl));
2324 master->is_auto = true;
2325 master->has_volatiles = set_volatile;
2326 master->manual_mode_value = manual_val;
2327 master->flags |= V4L2_CTRL_FLAG_UPDATE;
2328
2329 if (!is_cur_manual(master))
2330 flag = V4L2_CTRL_FLAG_INACTIVE |
2331 (set_volatile ? V4L2_CTRL_FLAG_VOLATILE : 0);
2332
2333 for (i = 1; i < ncontrols; i++)
2334 if (controls[i])
2335 controls[i]->flags |= flag;
2336 }
2337 EXPORT_SYMBOL(v4l2_ctrl_auto_cluster);
2338
2339 /* Activate/deactivate a control. */
2340 void v4l2_ctrl_activate(struct v4l2_ctrl *ctrl, bool active)
2341 {
2342 /* invert since the actual flag is called 'inactive' */
2343 bool inactive = !active;
2344 bool old;
2345
2346 if (ctrl == NULL)
2347 return;
2348
2349 if (inactive)
2350 /* set V4L2_CTRL_FLAG_INACTIVE */
2351 old = test_and_set_bit(4, &ctrl->flags);
2352 else
2353 /* clear V4L2_CTRL_FLAG_INACTIVE */
2354 old = test_and_clear_bit(4, &ctrl->flags);
2355 if (old != inactive)
2356 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_FLAGS);
2357 }
2358 EXPORT_SYMBOL(v4l2_ctrl_activate);
2359
2360 /* Grab/ungrab a control.
2361 Typically used when streaming starts and you want to grab controls,
2362 preventing the user from changing them.
2363
2364 Just call this and the framework will block any attempts to change
2365 these controls. */
2366 void v4l2_ctrl_grab(struct v4l2_ctrl *ctrl, bool grabbed)
2367 {
2368 bool old;
2369
2370 if (ctrl == NULL)
2371 return;
2372
2373 v4l2_ctrl_lock(ctrl);
2374 if (grabbed)
2375 /* set V4L2_CTRL_FLAG_GRABBED */
2376 old = test_and_set_bit(1, &ctrl->flags);
2377 else
2378 /* clear V4L2_CTRL_FLAG_GRABBED */
2379 old = test_and_clear_bit(1, &ctrl->flags);
2380 if (old != grabbed)
2381 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_FLAGS);
2382 v4l2_ctrl_unlock(ctrl);
2383 }
2384 EXPORT_SYMBOL(v4l2_ctrl_grab);
2385
2386 /* Log the control name and value */
2387 static void log_ctrl(const struct v4l2_ctrl *ctrl,
2388 const char *prefix, const char *colon)
2389 {
2390 if (ctrl->flags & (V4L2_CTRL_FLAG_DISABLED | V4L2_CTRL_FLAG_WRITE_ONLY))
2391 return;
2392 if (ctrl->type == V4L2_CTRL_TYPE_CTRL_CLASS)
2393 return;
2394
2395 pr_info("%s%s%s: ", prefix, colon, ctrl->name);
2396
2397 ctrl->type_ops->log(ctrl);
2398
2399 if (ctrl->flags & (V4L2_CTRL_FLAG_INACTIVE |
2400 V4L2_CTRL_FLAG_GRABBED |
2401 V4L2_CTRL_FLAG_VOLATILE)) {
2402 if (ctrl->flags & V4L2_CTRL_FLAG_INACTIVE)
2403 pr_cont(" inactive");
2404 if (ctrl->flags & V4L2_CTRL_FLAG_GRABBED)
2405 pr_cont(" grabbed");
2406 if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE)
2407 pr_cont(" volatile");
2408 }
2409 pr_cont("\n");
2410 }
2411
2412 /* Log all controls owned by the handler */
2413 void v4l2_ctrl_handler_log_status(struct v4l2_ctrl_handler *hdl,
2414 const char *prefix)
2415 {
2416 struct v4l2_ctrl *ctrl;
2417 const char *colon = "";
2418 int len;
2419
2420 if (hdl == NULL)
2421 return;
2422 if (prefix == NULL)
2423 prefix = "";
2424 len = strlen(prefix);
2425 if (len && prefix[len - 1] != ' ')
2426 colon = ": ";
2427 mutex_lock(hdl->lock);
2428 list_for_each_entry(ctrl, &hdl->ctrls, node)
2429 if (!(ctrl->flags & V4L2_CTRL_FLAG_DISABLED))
2430 log_ctrl(ctrl, prefix, colon);
2431 mutex_unlock(hdl->lock);
2432 }
2433 EXPORT_SYMBOL(v4l2_ctrl_handler_log_status);
2434
2435 int v4l2_ctrl_subdev_log_status(struct v4l2_subdev *sd)
2436 {
2437 v4l2_ctrl_handler_log_status(sd->ctrl_handler, sd->name);
2438 return 0;
2439 }
2440 EXPORT_SYMBOL(v4l2_ctrl_subdev_log_status);
2441
2442 /* Call s_ctrl for all controls owned by the handler */
2443 int v4l2_ctrl_handler_setup(struct v4l2_ctrl_handler *hdl)
2444 {
2445 struct v4l2_ctrl *ctrl;
2446 int ret = 0;
2447
2448 if (hdl == NULL)
2449 return 0;
2450 mutex_lock(hdl->lock);
2451 list_for_each_entry(ctrl, &hdl->ctrls, node)
2452 ctrl->done = false;
2453
2454 list_for_each_entry(ctrl, &hdl->ctrls, node) {
2455 struct v4l2_ctrl *master = ctrl->cluster[0];
2456 int i;
2457
2458 /* Skip if this control was already handled by a cluster. */
2459 /* Skip button controls and read-only controls. */
2460 if (ctrl->done || ctrl->type == V4L2_CTRL_TYPE_BUTTON ||
2461 (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY))
2462 continue;
2463
2464 for (i = 0; i < master->ncontrols; i++) {
2465 if (master->cluster[i]) {
2466 cur_to_new(master->cluster[i]);
2467 master->cluster[i]->is_new = 1;
2468 master->cluster[i]->done = true;
2469 }
2470 }
2471 ret = call_op(master, s_ctrl);
2472 if (ret)
2473 break;
2474 }
2475 mutex_unlock(hdl->lock);
2476 return ret;
2477 }
2478 EXPORT_SYMBOL(v4l2_ctrl_handler_setup);
2479
2480 /* Implement VIDIOC_QUERY_EXT_CTRL */
2481 int v4l2_query_ext_ctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_query_ext_ctrl *qc)
2482 {
2483 const unsigned next_flags = V4L2_CTRL_FLAG_NEXT_CTRL | V4L2_CTRL_FLAG_NEXT_COMPOUND;
2484 u32 id = qc->id & V4L2_CTRL_ID_MASK;
2485 struct v4l2_ctrl_ref *ref;
2486 struct v4l2_ctrl *ctrl;
2487
2488 if (hdl == NULL)
2489 return -EINVAL;
2490
2491 mutex_lock(hdl->lock);
2492
2493 /* Try to find it */
2494 ref = find_ref(hdl, id);
2495
2496 if ((qc->id & next_flags) && !list_empty(&hdl->ctrl_refs)) {
2497 bool is_compound;
2498 /* Match any control that is not hidden */
2499 unsigned mask = 1;
2500 bool match = false;
2501
2502 if ((qc->id & next_flags) == V4L2_CTRL_FLAG_NEXT_COMPOUND) {
2503 /* Match any hidden control */
2504 match = true;
2505 } else if ((qc->id & next_flags) == next_flags) {
2506 /* Match any control, compound or not */
2507 mask = 0;
2508 }
2509
2510 /* Find the next control with ID > qc->id */
2511
2512 /* Did we reach the end of the control list? */
2513 if (id >= node2id(hdl->ctrl_refs.prev)) {
2514 ref = NULL; /* Yes, so there is no next control */
2515 } else if (ref) {
2516 /* We found a control with the given ID, so just get
2517 the next valid one in the list. */
2518 list_for_each_entry_continue(ref, &hdl->ctrl_refs, node) {
2519 is_compound = ref->ctrl->is_array ||
2520 ref->ctrl->type >= V4L2_CTRL_COMPOUND_TYPES;
2521 if (id < ref->ctrl->id &&
2522 (is_compound & mask) == match)
2523 break;
2524 }
2525 if (&ref->node == &hdl->ctrl_refs)
2526 ref = NULL;
2527 } else {
2528 /* No control with the given ID exists, so start
2529 searching for the next largest ID. We know there
2530 is one, otherwise the first 'if' above would have
2531 been true. */
2532 list_for_each_entry(ref, &hdl->ctrl_refs, node) {
2533 is_compound = ref->ctrl->is_array ||
2534 ref->ctrl->type >= V4L2_CTRL_COMPOUND_TYPES;
2535 if (id < ref->ctrl->id &&
2536 (is_compound & mask) == match)
2537 break;
2538 }
2539 if (&ref->node == &hdl->ctrl_refs)
2540 ref = NULL;
2541 }
2542 }
2543 mutex_unlock(hdl->lock);
2544
2545 if (!ref)
2546 return -EINVAL;
2547
2548 ctrl = ref->ctrl;
2549 memset(qc, 0, sizeof(*qc));
2550 if (id >= V4L2_CID_PRIVATE_BASE)
2551 qc->id = id;
2552 else
2553 qc->id = ctrl->id;
2554 strlcpy(qc->name, ctrl->name, sizeof(qc->name));
2555 qc->flags = ctrl->flags;
2556 qc->type = ctrl->type;
2557 if (ctrl->is_ptr)
2558 qc->flags |= V4L2_CTRL_FLAG_HAS_PAYLOAD;
2559 qc->elem_size = ctrl->elem_size;
2560 qc->elems = ctrl->elems;
2561 qc->nr_of_dims = ctrl->nr_of_dims;
2562 memcpy(qc->dims, ctrl->dims, qc->nr_of_dims * sizeof(qc->dims[0]));
2563 qc->minimum = ctrl->minimum;
2564 qc->maximum = ctrl->maximum;
2565 qc->default_value = ctrl->default_value;
2566 if (ctrl->type == V4L2_CTRL_TYPE_MENU
2567 || ctrl->type == V4L2_CTRL_TYPE_INTEGER_MENU)
2568 qc->step = 1;
2569 else
2570 qc->step = ctrl->step;
2571 return 0;
2572 }
2573 EXPORT_SYMBOL(v4l2_query_ext_ctrl);
2574
2575 /* Implement VIDIOC_QUERYCTRL */
2576 int v4l2_queryctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_queryctrl *qc)
2577 {
2578 struct v4l2_query_ext_ctrl qec = { qc->id };
2579 int rc;
2580
2581 rc = v4l2_query_ext_ctrl(hdl, &qec);
2582 if (rc)
2583 return rc;
2584
2585 qc->id = qec.id;
2586 qc->type = qec.type;
2587 qc->flags = qec.flags;
2588 strlcpy(qc->name, qec.name, sizeof(qc->name));
2589 switch (qc->type) {
2590 case V4L2_CTRL_TYPE_INTEGER:
2591 case V4L2_CTRL_TYPE_BOOLEAN:
2592 case V4L2_CTRL_TYPE_MENU:
2593 case V4L2_CTRL_TYPE_INTEGER_MENU:
2594 case V4L2_CTRL_TYPE_STRING:
2595 case V4L2_CTRL_TYPE_BITMASK:
2596 qc->minimum = qec.minimum;
2597 qc->maximum = qec.maximum;
2598 qc->step = qec.step;
2599 qc->default_value = qec.default_value;
2600 break;
2601 default:
2602 qc->minimum = 0;
2603 qc->maximum = 0;
2604 qc->step = 0;
2605 qc->default_value = 0;
2606 break;
2607 }
2608 return 0;
2609 }
2610 EXPORT_SYMBOL(v4l2_queryctrl);
2611
2612 /* Implement VIDIOC_QUERYMENU */
2613 int v4l2_querymenu(struct v4l2_ctrl_handler *hdl, struct v4l2_querymenu *qm)
2614 {
2615 struct v4l2_ctrl *ctrl;
2616 u32 i = qm->index;
2617
2618 ctrl = v4l2_ctrl_find(hdl, qm->id);
2619 if (!ctrl)
2620 return -EINVAL;
2621
2622 qm->reserved = 0;
2623 /* Sanity checks */
2624 switch (ctrl->type) {
2625 case V4L2_CTRL_TYPE_MENU:
2626 if (ctrl->qmenu == NULL)
2627 return -EINVAL;
2628 break;
2629 case V4L2_CTRL_TYPE_INTEGER_MENU:
2630 if (ctrl->qmenu_int == NULL)
2631 return -EINVAL;
2632 break;
2633 default:
2634 return -EINVAL;
2635 }
2636
2637 if (i < ctrl->minimum || i > ctrl->maximum)
2638 return -EINVAL;
2639
2640 /* Use mask to see if this menu item should be skipped */
2641 if (ctrl->menu_skip_mask & (1 << i))
2642 return -EINVAL;
2643 /* Empty menu items should also be skipped */
2644 if (ctrl->type == V4L2_CTRL_TYPE_MENU) {
2645 if (ctrl->qmenu[i] == NULL || ctrl->qmenu[i][0] == '\0')
2646 return -EINVAL;
2647 strlcpy(qm->name, ctrl->qmenu[i], sizeof(qm->name));
2648 } else {
2649 qm->value = ctrl->qmenu_int[i];
2650 }
2651 return 0;
2652 }
2653 EXPORT_SYMBOL(v4l2_querymenu);
2654
2655
2656 /* Some general notes on the atomic requirements of VIDIOC_G/TRY/S_EXT_CTRLS:
2657
2658 It is not a fully atomic operation, just best-effort only. After all, if
2659 multiple controls have to be set through multiple i2c writes (for example)
2660 then some initial writes may succeed while others fail. Thus leaving the
2661 system in an inconsistent state. The question is how much effort you are
2662 willing to spend on trying to make something atomic that really isn't.
2663
2664 From the point of view of an application the main requirement is that
2665 when you call VIDIOC_S_EXT_CTRLS and some values are invalid then an
2666 error should be returned without actually affecting any controls.
2667
2668 If all the values are correct, then it is acceptable to just give up
2669 in case of low-level errors.
2670
2671 It is important though that the application can tell when only a partial
2672 configuration was done. The way we do that is through the error_idx field
2673 of struct v4l2_ext_controls: if that is equal to the count field then no
2674 controls were affected. Otherwise all controls before that index were
2675 successful in performing their 'get' or 'set' operation, the control at
2676 the given index failed, and you don't know what happened with the controls
2677 after the failed one. Since if they were part of a control cluster they
2678 could have been successfully processed (if a cluster member was encountered
2679 at index < error_idx), they could have failed (if a cluster member was at
2680 error_idx), or they may not have been processed yet (if the first cluster
2681 member appeared after error_idx).
2682
2683 It is all fairly theoretical, though. In practice all you can do is to
2684 bail out. If error_idx == count, then it is an application bug. If
2685 error_idx < count then it is only an application bug if the error code was
2686 EBUSY. That usually means that something started streaming just when you
2687 tried to set the controls. In all other cases it is a driver/hardware
2688 problem and all you can do is to retry or bail out.
2689
2690 Note that these rules do not apply to VIDIOC_TRY_EXT_CTRLS: since that
2691 never modifies controls the error_idx is just set to whatever control
2692 has an invalid value.
2693 */
2694
2695 /* Prepare for the extended g/s/try functions.
2696 Find the controls in the control array and do some basic checks. */
2697 static int prepare_ext_ctrls(struct v4l2_ctrl_handler *hdl,
2698 struct v4l2_ext_controls *cs,
2699 struct v4l2_ctrl_helper *helpers,
2700 bool get)
2701 {
2702 struct v4l2_ctrl_helper *h;
2703 bool have_clusters = false;
2704 u32 i;
2705
2706 for (i = 0, h = helpers; i < cs->count; i++, h++) {
2707 struct v4l2_ext_control *c = &cs->controls[i];
2708 struct v4l2_ctrl_ref *ref;
2709 struct v4l2_ctrl *ctrl;
2710 u32 id = c->id & V4L2_CTRL_ID_MASK;
2711
2712 cs->error_idx = i;
2713
2714 if (cs->which &&
2715 cs->which != V4L2_CTRL_WHICH_DEF_VAL &&
2716 V4L2_CTRL_ID2WHICH(id) != cs->which)
2717 return -EINVAL;
2718
2719 /* Old-style private controls are not allowed for
2720 extended controls */
2721 if (id >= V4L2_CID_PRIVATE_BASE)
2722 return -EINVAL;
2723 ref = find_ref_lock(hdl, id);
2724 if (ref == NULL)
2725 return -EINVAL;
2726 ctrl = ref->ctrl;
2727 if (ctrl->flags & V4L2_CTRL_FLAG_DISABLED)
2728 return -EINVAL;
2729
2730 if (ctrl->cluster[0]->ncontrols > 1)
2731 have_clusters = true;
2732 if (ctrl->cluster[0] != ctrl)
2733 ref = find_ref_lock(hdl, ctrl->cluster[0]->id);
2734 if (ctrl->is_ptr && !ctrl->is_string) {
2735 unsigned tot_size = ctrl->elems * ctrl->elem_size;
2736
2737 if (c->size < tot_size) {
2738 if (get) {
2739 c->size = tot_size;
2740 return -ENOSPC;
2741 }
2742 return -EFAULT;
2743 }
2744 c->size = tot_size;
2745 }
2746 /* Store the ref to the master control of the cluster */
2747 h->mref = ref;
2748 h->ctrl = ctrl;
2749 /* Initially set next to 0, meaning that there is no other
2750 control in this helper array belonging to the same
2751 cluster */
2752 h->next = 0;
2753 }
2754
2755 /* We are done if there were no controls that belong to a multi-
2756 control cluster. */
2757 if (!have_clusters)
2758 return 0;
2759
2760 /* The code below figures out in O(n) time which controls in the list
2761 belong to the same cluster. */
2762
2763 /* This has to be done with the handler lock taken. */
2764 mutex_lock(hdl->lock);
2765
2766 /* First zero the helper field in the master control references */
2767 for (i = 0; i < cs->count; i++)
2768 helpers[i].mref->helper = NULL;
2769 for (i = 0, h = helpers; i < cs->count; i++, h++) {
2770 struct v4l2_ctrl_ref *mref = h->mref;
2771
2772 /* If the mref->helper is set, then it points to an earlier
2773 helper that belongs to the same cluster. */
2774 if (mref->helper) {
2775 /* Set the next field of mref->helper to the current
2776 index: this means that that earlier helper now
2777 points to the next helper in the same cluster. */
2778 mref->helper->next = i;
2779 /* mref should be set only for the first helper in the
2780 cluster, clear the others. */
2781 h->mref = NULL;
2782 }
2783 /* Point the mref helper to the current helper struct. */
2784 mref->helper = h;
2785 }
2786 mutex_unlock(hdl->lock);
2787 return 0;
2788 }
2789
2790 /* Handles the corner case where cs->count == 0. It checks whether the
2791 specified control class exists. If that class ID is 0, then it checks
2792 whether there are any controls at all. */
2793 static int class_check(struct v4l2_ctrl_handler *hdl, u32 which)
2794 {
2795 if (which == 0 || which == V4L2_CTRL_WHICH_DEF_VAL)
2796 return list_empty(&hdl->ctrl_refs) ? -EINVAL : 0;
2797 return find_ref_lock(hdl, which | 1) ? 0 : -EINVAL;
2798 }
2799
2800
2801
2802 /* Get extended controls. Allocates the helpers array if needed. */
2803 int v4l2_g_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *cs)
2804 {
2805 struct v4l2_ctrl_helper helper[4];
2806 struct v4l2_ctrl_helper *helpers = helper;
2807 int ret;
2808 int i, j;
2809 bool def_value;
2810
2811 def_value = (cs->which == V4L2_CTRL_WHICH_DEF_VAL);
2812
2813 cs->error_idx = cs->count;
2814 cs->which = V4L2_CTRL_ID2WHICH(cs->which);
2815
2816 if (hdl == NULL)
2817 return -EINVAL;
2818
2819 if (cs->count == 0)
2820 return class_check(hdl, cs->which);
2821
2822 if (cs->count > ARRAY_SIZE(helper)) {
2823 helpers = kmalloc_array(cs->count, sizeof(helper[0]),
2824 GFP_KERNEL);
2825 if (helpers == NULL)
2826 return -ENOMEM;
2827 }
2828
2829 ret = prepare_ext_ctrls(hdl, cs, helpers, true);
2830 cs->error_idx = cs->count;
2831
2832 for (i = 0; !ret && i < cs->count; i++)
2833 if (helpers[i].ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY)
2834 ret = -EACCES;
2835
2836 for (i = 0; !ret && i < cs->count; i++) {
2837 int (*ctrl_to_user)(struct v4l2_ext_control *c,
2838 struct v4l2_ctrl *ctrl);
2839 struct v4l2_ctrl *master;
2840
2841 ctrl_to_user = def_value ? def_to_user : cur_to_user;
2842
2843 if (helpers[i].mref == NULL)
2844 continue;
2845
2846 master = helpers[i].mref->ctrl;
2847 cs->error_idx = i;
2848
2849 v4l2_ctrl_lock(master);
2850
2851 /* g_volatile_ctrl will update the new control values */
2852 if (!def_value &&
2853 ((master->flags & V4L2_CTRL_FLAG_VOLATILE) ||
2854 (master->has_volatiles && !is_cur_manual(master)))) {
2855 for (j = 0; j < master->ncontrols; j++)
2856 cur_to_new(master->cluster[j]);
2857 ret = call_op(master, g_volatile_ctrl);
2858 ctrl_to_user = new_to_user;
2859 }
2860 /* If OK, then copy the current (for non-volatile controls)
2861 or the new (for volatile controls) control values to the
2862 caller */
2863 if (!ret) {
2864 u32 idx = i;
2865
2866 do {
2867 ret = ctrl_to_user(cs->controls + idx,
2868 helpers[idx].ctrl);
2869 idx = helpers[idx].next;
2870 } while (!ret && idx);
2871 }
2872 v4l2_ctrl_unlock(master);
2873 }
2874
2875 if (cs->count > ARRAY_SIZE(helper))
2876 kfree(helpers);
2877 return ret;
2878 }
2879 EXPORT_SYMBOL(v4l2_g_ext_ctrls);
2880
2881 /* Helper function to get a single control */
2882 static int get_ctrl(struct v4l2_ctrl *ctrl, struct v4l2_ext_control *c)
2883 {
2884 struct v4l2_ctrl *master = ctrl->cluster[0];
2885 int ret = 0;
2886 int i;
2887
2888 /* Compound controls are not supported. The new_to_user() and
2889 * cur_to_user() calls below would need to be modified not to access
2890 * userspace memory when called from get_ctrl().
2891 */
2892 if (!ctrl->is_int && ctrl->type != V4L2_CTRL_TYPE_INTEGER64)
2893 return -EINVAL;
2894
2895 if (ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY)
2896 return -EACCES;
2897
2898 v4l2_ctrl_lock(master);
2899 /* g_volatile_ctrl will update the current control values */
2900 if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE) {
2901 for (i = 0; i < master->ncontrols; i++)
2902 cur_to_new(master->cluster[i]);
2903 ret = call_op(master, g_volatile_ctrl);
2904 new_to_user(c, ctrl);
2905 } else {
2906 cur_to_user(c, ctrl);
2907 }
2908 v4l2_ctrl_unlock(master);
2909 return ret;
2910 }
2911
2912 int v4l2_g_ctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_control *control)
2913 {
2914 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, control->id);
2915 struct v4l2_ext_control c;
2916 int ret;
2917
2918 if (ctrl == NULL || !ctrl->is_int)
2919 return -EINVAL;
2920 ret = get_ctrl(ctrl, &c);
2921 control->value = c.value;
2922 return ret;
2923 }
2924 EXPORT_SYMBOL(v4l2_g_ctrl);
2925
2926 s32 v4l2_ctrl_g_ctrl(struct v4l2_ctrl *ctrl)
2927 {
2928 struct v4l2_ext_control c;
2929
2930 /* It's a driver bug if this happens. */
2931 WARN_ON(!ctrl->is_int);
2932 c.value = 0;
2933 get_ctrl(ctrl, &c);
2934 return c.value;
2935 }
2936 EXPORT_SYMBOL(v4l2_ctrl_g_ctrl);
2937
2938 s64 v4l2_ctrl_g_ctrl_int64(struct v4l2_ctrl *ctrl)
2939 {
2940 struct v4l2_ext_control c;
2941
2942 /* It's a driver bug if this happens. */
2943 WARN_ON(ctrl->is_ptr || ctrl->type != V4L2_CTRL_TYPE_INTEGER64);
2944 c.value64 = 0;
2945 get_ctrl(ctrl, &c);
2946 return c.value64;
2947 }
2948 EXPORT_SYMBOL(v4l2_ctrl_g_ctrl_int64);
2949
2950
2951 /* Core function that calls try/s_ctrl and ensures that the new value is
2952 copied to the current value on a set.
2953 Must be called with ctrl->handler->lock held. */
2954 static int try_or_set_cluster(struct v4l2_fh *fh, struct v4l2_ctrl *master,
2955 bool set, u32 ch_flags)
2956 {
2957 bool update_flag;
2958 int ret;
2959 int i;
2960
2961 /* Go through the cluster and either validate the new value or
2962 (if no new value was set), copy the current value to the new
2963 value, ensuring a consistent view for the control ops when
2964 called. */
2965 for (i = 0; i < master->ncontrols; i++) {
2966 struct v4l2_ctrl *ctrl = master->cluster[i];
2967
2968 if (ctrl == NULL)
2969 continue;
2970
2971 if (!ctrl->is_new) {
2972 cur_to_new(ctrl);
2973 continue;
2974 }
2975 /* Check again: it may have changed since the
2976 previous check in try_or_set_ext_ctrls(). */
2977 if (set && (ctrl->flags & V4L2_CTRL_FLAG_GRABBED))
2978 return -EBUSY;
2979 }
2980
2981 ret = call_op(master, try_ctrl);
2982
2983 /* Don't set if there is no change */
2984 if (ret || !set || !cluster_changed(master))
2985 return ret;
2986 ret = call_op(master, s_ctrl);
2987 if (ret)
2988 return ret;
2989
2990 /* If OK, then make the new values permanent. */
2991 update_flag = is_cur_manual(master) != is_new_manual(master);
2992 for (i = 0; i < master->ncontrols; i++)
2993 new_to_cur(fh, master->cluster[i], ch_flags |
2994 ((update_flag && i > 0) ? V4L2_EVENT_CTRL_CH_FLAGS : 0));
2995 return 0;
2996 }
2997
2998 /* Validate controls. */
2999 static int validate_ctrls(struct v4l2_ext_controls *cs,
3000 struct v4l2_ctrl_helper *helpers, bool set)
3001 {
3002 unsigned i;
3003 int ret = 0;
3004
3005 cs->error_idx = cs->count;
3006 for (i = 0; i < cs->count; i++) {
3007 struct v4l2_ctrl *ctrl = helpers[i].ctrl;
3008 union v4l2_ctrl_ptr p_new;
3009
3010 cs->error_idx = i;
3011
3012 if (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY)
3013 return -EACCES;
3014 /* This test is also done in try_set_control_cluster() which
3015 is called in atomic context, so that has the final say,
3016 but it makes sense to do an up-front check as well. Once
3017 an error occurs in try_set_control_cluster() some other
3018 controls may have been set already and we want to do a
3019 best-effort to avoid that. */
3020 if (set && (ctrl->flags & V4L2_CTRL_FLAG_GRABBED))
3021 return -EBUSY;
3022 /*
3023 * Skip validation for now if the payload needs to be copied
3024 * from userspace into kernelspace. We'll validate those later.
3025 */
3026 if (ctrl->is_ptr)
3027 continue;
3028 if (ctrl->type == V4L2_CTRL_TYPE_INTEGER64)
3029 p_new.p_s64 = &cs->controls[i].value64;
3030 else
3031 p_new.p_s32 = &cs->controls[i].value;
3032 ret = validate_new(ctrl, p_new);
3033 if (ret)
3034 return ret;
3035 }
3036 return 0;
3037 }
3038
3039 /* Obtain the current volatile values of an autocluster and mark them
3040 as new. */
3041 static void update_from_auto_cluster(struct v4l2_ctrl *master)
3042 {
3043 int i;
3044
3045 for (i = 1; i < master->ncontrols; i++)
3046 cur_to_new(master->cluster[i]);
3047 if (!call_op(master, g_volatile_ctrl))
3048 for (i = 1; i < master->ncontrols; i++)
3049 if (master->cluster[i])
3050 master->cluster[i]->is_new = 1;
3051 }
3052
3053 /* Try or try-and-set controls */
3054 static int try_set_ext_ctrls(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
3055 struct v4l2_ext_controls *cs,
3056 bool set)
3057 {
3058 struct v4l2_ctrl_helper helper[4];
3059 struct v4l2_ctrl_helper *helpers = helper;
3060 unsigned i, j;
3061 int ret;
3062
3063 cs->error_idx = cs->count;
3064
3065 /* Default value cannot be changed */
3066 if (cs->which == V4L2_CTRL_WHICH_DEF_VAL)
3067 return -EINVAL;
3068
3069 cs->which = V4L2_CTRL_ID2WHICH(cs->which);
3070
3071 if (hdl == NULL)
3072 return -EINVAL;
3073
3074 if (cs->count == 0)
3075 return class_check(hdl, cs->which);
3076
3077 if (cs->count > ARRAY_SIZE(helper)) {
3078 helpers = kmalloc_array(cs->count, sizeof(helper[0]),
3079 GFP_KERNEL);
3080 if (!helpers)
3081 return -ENOMEM;
3082 }
3083 ret = prepare_ext_ctrls(hdl, cs, helpers, false);
3084 if (!ret)
3085 ret = validate_ctrls(cs, helpers, set);
3086 if (ret && set)
3087 cs->error_idx = cs->count;
3088 for (i = 0; !ret && i < cs->count; i++) {
3089 struct v4l2_ctrl *master;
3090 u32 idx = i;
3091
3092 if (helpers[i].mref == NULL)
3093 continue;
3094
3095 cs->error_idx = i;
3096 master = helpers[i].mref->ctrl;
3097 v4l2_ctrl_lock(master);
3098
3099 /* Reset the 'is_new' flags of the cluster */
3100 for (j = 0; j < master->ncontrols; j++)
3101 if (master->cluster[j])
3102 master->cluster[j]->is_new = 0;
3103
3104 /* For volatile autoclusters that are currently in auto mode
3105 we need to discover if it will be set to manual mode.
3106 If so, then we have to copy the current volatile values
3107 first since those will become the new manual values (which
3108 may be overwritten by explicit new values from this set
3109 of controls). */
3110 if (master->is_auto && master->has_volatiles &&
3111 !is_cur_manual(master)) {
3112 /* Pick an initial non-manual value */
3113 s32 new_auto_val = master->manual_mode_value + 1;
3114 u32 tmp_idx = idx;
3115
3116 do {
3117 /* Check if the auto control is part of the
3118 list, and remember the new value. */
3119 if (helpers[tmp_idx].ctrl == master)
3120 new_auto_val = cs->controls[tmp_idx].value;
3121 tmp_idx = helpers[tmp_idx].next;
3122 } while (tmp_idx);
3123 /* If the new value == the manual value, then copy
3124 the current volatile values. */
3125 if (new_auto_val == master->manual_mode_value)
3126 update_from_auto_cluster(master);
3127 }
3128
3129 /* Copy the new caller-supplied control values.
3130 user_to_new() sets 'is_new' to 1. */
3131 do {
3132 struct v4l2_ctrl *ctrl = helpers[idx].ctrl;
3133
3134 ret = user_to_new(cs->controls + idx, ctrl);
3135 if (!ret && ctrl->is_ptr)
3136 ret = validate_new(ctrl, ctrl->p_new);
3137 idx = helpers[idx].next;
3138 } while (!ret && idx);
3139
3140 if (!ret)
3141 ret = try_or_set_cluster(fh, master, set, 0);
3142
3143 /* Copy the new values back to userspace. */
3144 if (!ret) {
3145 idx = i;
3146 do {
3147 ret = new_to_user(cs->controls + idx,
3148 helpers[idx].ctrl);
3149 idx = helpers[idx].next;
3150 } while (!ret && idx);
3151 }
3152 v4l2_ctrl_unlock(master);
3153 }
3154
3155 if (cs->count > ARRAY_SIZE(helper))
3156 kfree(helpers);
3157 return ret;
3158 }
3159
3160 int v4l2_try_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *cs)
3161 {
3162 return try_set_ext_ctrls(NULL, hdl, cs, false);
3163 }
3164 EXPORT_SYMBOL(v4l2_try_ext_ctrls);
3165
3166 int v4l2_s_ext_ctrls(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
3167 struct v4l2_ext_controls *cs)
3168 {
3169 return try_set_ext_ctrls(fh, hdl, cs, true);
3170 }
3171 EXPORT_SYMBOL(v4l2_s_ext_ctrls);
3172
3173 /* Helper function for VIDIOC_S_CTRL compatibility */
3174 static int set_ctrl(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, u32 ch_flags)
3175 {
3176 struct v4l2_ctrl *master = ctrl->cluster[0];
3177 int ret;
3178 int i;
3179
3180 /* Reset the 'is_new' flags of the cluster */
3181 for (i = 0; i < master->ncontrols; i++)
3182 if (master->cluster[i])
3183 master->cluster[i]->is_new = 0;
3184
3185 ret = validate_new(ctrl, ctrl->p_new);
3186 if (ret)
3187 return ret;
3188
3189 /* For autoclusters with volatiles that are switched from auto to
3190 manual mode we have to update the current volatile values since
3191 those will become the initial manual values after such a switch. */
3192 if (master->is_auto && master->has_volatiles && ctrl == master &&
3193 !is_cur_manual(master) && ctrl->val == master->manual_mode_value)
3194 update_from_auto_cluster(master);
3195
3196 ctrl->is_new = 1;
3197 return try_or_set_cluster(fh, master, true, ch_flags);
3198 }
3199
3200 /* Helper function for VIDIOC_S_CTRL compatibility */
3201 static int set_ctrl_lock(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl,
3202 struct v4l2_ext_control *c)
3203 {
3204 int ret;
3205
3206 v4l2_ctrl_lock(ctrl);
3207 user_to_new(c, ctrl);
3208 ret = set_ctrl(fh, ctrl, 0);
3209 if (!ret)
3210 cur_to_user(c, ctrl);
3211 v4l2_ctrl_unlock(ctrl);
3212 return ret;
3213 }
3214
3215 int v4l2_s_ctrl(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
3216 struct v4l2_control *control)
3217 {
3218 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, control->id);
3219 struct v4l2_ext_control c = { control->id };
3220 int ret;
3221
3222 if (ctrl == NULL || !ctrl->is_int)
3223 return -EINVAL;
3224
3225 if (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY)
3226 return -EACCES;
3227
3228 c.value = control->value;
3229 ret = set_ctrl_lock(fh, ctrl, &c);
3230 control->value = c.value;
3231 return ret;
3232 }
3233 EXPORT_SYMBOL(v4l2_s_ctrl);
3234
3235 int __v4l2_ctrl_s_ctrl(struct v4l2_ctrl *ctrl, s32 val)
3236 {
3237 lockdep_assert_held(ctrl->handler->lock);
3238
3239 /* It's a driver bug if this happens. */
3240 WARN_ON(!ctrl->is_int);
3241 ctrl->val = val;
3242 return set_ctrl(NULL, ctrl, 0);
3243 }
3244 EXPORT_SYMBOL(__v4l2_ctrl_s_ctrl);
3245
3246 int __v4l2_ctrl_s_ctrl_int64(struct v4l2_ctrl *ctrl, s64 val)
3247 {
3248 lockdep_assert_held(ctrl->handler->lock);
3249
3250 /* It's a driver bug if this happens. */
3251 WARN_ON(ctrl->is_ptr || ctrl->type != V4L2_CTRL_TYPE_INTEGER64);
3252 *ctrl->p_new.p_s64 = val;
3253 return set_ctrl(NULL, ctrl, 0);
3254 }
3255 EXPORT_SYMBOL(__v4l2_ctrl_s_ctrl_int64);
3256
3257 int __v4l2_ctrl_s_ctrl_string(struct v4l2_ctrl *ctrl, const char *s)
3258 {
3259 lockdep_assert_held(ctrl->handler->lock);
3260
3261 /* It's a driver bug if this happens. */
3262 WARN_ON(ctrl->type != V4L2_CTRL_TYPE_STRING);
3263 strlcpy(ctrl->p_new.p_char, s, ctrl->maximum + 1);
3264 return set_ctrl(NULL, ctrl, 0);
3265 }
3266 EXPORT_SYMBOL(__v4l2_ctrl_s_ctrl_string);
3267
3268 void v4l2_ctrl_notify(struct v4l2_ctrl *ctrl, v4l2_ctrl_notify_fnc notify, void *priv)
3269 {
3270 if (ctrl == NULL)
3271 return;
3272 if (notify == NULL) {
3273 ctrl->call_notify = 0;
3274 return;
3275 }
3276 if (WARN_ON(ctrl->handler->notify && ctrl->handler->notify != notify))
3277 return;
3278 ctrl->handler->notify = notify;
3279 ctrl->handler->notify_priv = priv;
3280 ctrl->call_notify = 1;
3281 }
3282 EXPORT_SYMBOL(v4l2_ctrl_notify);
3283
3284 int __v4l2_ctrl_modify_range(struct v4l2_ctrl *ctrl,
3285 s64 min, s64 max, u64 step, s64 def)
3286 {
3287 bool value_changed;
3288 bool range_changed = false;
3289 int ret;
3290
3291 lockdep_assert_held(ctrl->handler->lock);
3292
3293 switch (ctrl->type) {
3294 case V4L2_CTRL_TYPE_INTEGER:
3295 case V4L2_CTRL_TYPE_INTEGER64:
3296 case V4L2_CTRL_TYPE_BOOLEAN:
3297 case V4L2_CTRL_TYPE_MENU:
3298 case V4L2_CTRL_TYPE_INTEGER_MENU:
3299 case V4L2_CTRL_TYPE_BITMASK:
3300 case V4L2_CTRL_TYPE_U8:
3301 case V4L2_CTRL_TYPE_U16:
3302 case V4L2_CTRL_TYPE_U32:
3303 if (ctrl->is_array)
3304 return -EINVAL;
3305 ret = check_range(ctrl->type, min, max, step, def);
3306 if (ret)
3307 return ret;
3308 break;
3309 default:
3310 return -EINVAL;
3311 }
3312 if ((ctrl->minimum != min) || (ctrl->maximum != max) ||
3313 (ctrl->step != step) || ctrl->default_value != def) {
3314 range_changed = true;
3315 ctrl->minimum = min;
3316 ctrl->maximum = max;
3317 ctrl->step = step;
3318 ctrl->default_value = def;
3319 }
3320 cur_to_new(ctrl);
3321 if (validate_new(ctrl, ctrl->p_new)) {
3322 if (ctrl->type == V4L2_CTRL_TYPE_INTEGER64)
3323 *ctrl->p_new.p_s64 = def;
3324 else
3325 *ctrl->p_new.p_s32 = def;
3326 }
3327
3328 if (ctrl->type == V4L2_CTRL_TYPE_INTEGER64)
3329 value_changed = *ctrl->p_new.p_s64 != *ctrl->p_cur.p_s64;
3330 else
3331 value_changed = *ctrl->p_new.p_s32 != *ctrl->p_cur.p_s32;
3332 if (value_changed)
3333 ret = set_ctrl(NULL, ctrl, V4L2_EVENT_CTRL_CH_RANGE);
3334 else if (range_changed)
3335 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_RANGE);
3336 return ret;
3337 }
3338 EXPORT_SYMBOL(__v4l2_ctrl_modify_range);
3339
3340 static int v4l2_ctrl_add_event(struct v4l2_subscribed_event *sev, unsigned elems)
3341 {
3342 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(sev->fh->ctrl_handler, sev->id);
3343
3344 if (ctrl == NULL)
3345 return -EINVAL;
3346
3347 v4l2_ctrl_lock(ctrl);
3348 list_add_tail(&sev->node, &ctrl->ev_subs);
3349 if (ctrl->type != V4L2_CTRL_TYPE_CTRL_CLASS &&
3350 (sev->flags & V4L2_EVENT_SUB_FL_SEND_INITIAL)) {
3351 struct v4l2_event ev;
3352 u32 changes = V4L2_EVENT_CTRL_CH_FLAGS;
3353
3354 if (!(ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY))
3355 changes |= V4L2_EVENT_CTRL_CH_VALUE;
3356 fill_event(&ev, ctrl, changes);
3357 /* Mark the queue as active, allowing this initial
3358 event to be accepted. */
3359 sev->elems = elems;
3360 v4l2_event_queue_fh(sev->fh, &ev);
3361 }
3362 v4l2_ctrl_unlock(ctrl);
3363 return 0;
3364 }
3365
3366 static void v4l2_ctrl_del_event(struct v4l2_subscribed_event *sev)
3367 {
3368 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(sev->fh->ctrl_handler, sev->id);
3369
3370 v4l2_ctrl_lock(ctrl);
3371 list_del(&sev->node);
3372 v4l2_ctrl_unlock(ctrl);
3373 }
3374
3375 void v4l2_ctrl_replace(struct v4l2_event *old, const struct v4l2_event *new)
3376 {
3377 u32 old_changes = old->u.ctrl.changes;
3378
3379 old->u.ctrl = new->u.ctrl;
3380 old->u.ctrl.changes |= old_changes;
3381 }
3382 EXPORT_SYMBOL(v4l2_ctrl_replace);
3383
3384 void v4l2_ctrl_merge(const struct v4l2_event *old, struct v4l2_event *new)
3385 {
3386 new->u.ctrl.changes |= old->u.ctrl.changes;
3387 }
3388 EXPORT_SYMBOL(v4l2_ctrl_merge);
3389
3390 const struct v4l2_subscribed_event_ops v4l2_ctrl_sub_ev_ops = {
3391 .add = v4l2_ctrl_add_event,
3392 .del = v4l2_ctrl_del_event,
3393 .replace = v4l2_ctrl_replace,
3394 .merge = v4l2_ctrl_merge,
3395 };
3396 EXPORT_SYMBOL(v4l2_ctrl_sub_ev_ops);
3397
3398 int v4l2_ctrl_log_status(struct file *file, void *fh)
3399 {
3400 struct video_device *vfd = video_devdata(file);
3401 struct v4l2_fh *vfh = file->private_data;
3402
3403 if (test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags) && vfd->v4l2_dev)
3404 v4l2_ctrl_handler_log_status(vfh->ctrl_handler,
3405 vfd->v4l2_dev->name);
3406 return 0;
3407 }
3408 EXPORT_SYMBOL(v4l2_ctrl_log_status);
3409
3410 int v4l2_ctrl_subscribe_event(struct v4l2_fh *fh,
3411 const struct v4l2_event_subscription *sub)
3412 {
3413 if (sub->type == V4L2_EVENT_CTRL)
3414 return v4l2_event_subscribe(fh, sub, 0, &v4l2_ctrl_sub_ev_ops);
3415 return -EINVAL;
3416 }
3417 EXPORT_SYMBOL(v4l2_ctrl_subscribe_event);
3418
3419 int v4l2_ctrl_subdev_subscribe_event(struct v4l2_subdev *sd, struct v4l2_fh *fh,
3420 struct v4l2_event_subscription *sub)
3421 {
3422 if (!sd->ctrl_handler)
3423 return -EINVAL;
3424 return v4l2_ctrl_subscribe_event(fh, sub);
3425 }
3426 EXPORT_SYMBOL(v4l2_ctrl_subdev_subscribe_event);
3427
3428 unsigned int v4l2_ctrl_poll(struct file *file, struct poll_table_struct *wait)
3429 {
3430 struct v4l2_fh *fh = file->private_data;
3431
3432 if (v4l2_event_pending(fh))
3433 return POLLPRI;
3434 poll_wait(file, &fh->wait, wait);
3435 return 0;
3436 }
3437 EXPORT_SYMBOL(v4l2_ctrl_poll);
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