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. */
is_cur_manual(const struct v4l2_ctrl * master)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. */
is_new_manual(const struct v4l2_ctrl * master)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. */
v4l2_ctrl_get_menu(u32 id)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 */
v4l2_ctrl_get_int_menu(u32 id,u32 * len)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. */
v4l2_ctrl_get_name(u32 id)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
889 /* DV controls */
890 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
891 case V4L2_CID_DV_CLASS: return "Digital Video Controls";
892 case V4L2_CID_DV_TX_HOTPLUG: return "Hotplug Present";
893 case V4L2_CID_DV_TX_RXSENSE: return "RxSense Present";
894 case V4L2_CID_DV_TX_EDID_PRESENT: return "EDID Present";
895 case V4L2_CID_DV_TX_MODE: return "Transmit Mode";
896 case V4L2_CID_DV_TX_RGB_RANGE: return "Tx RGB Quantization Range";
897 case V4L2_CID_DV_TX_IT_CONTENT_TYPE: return "Tx IT Content Type";
898 case V4L2_CID_DV_RX_POWER_PRESENT: return "Power Present";
899 case V4L2_CID_DV_RX_RGB_RANGE: return "Rx RGB Quantization Range";
900 case V4L2_CID_DV_RX_IT_CONTENT_TYPE: return "Rx IT Content Type";
901
902 case V4L2_CID_FM_RX_CLASS: return "FM Radio Receiver Controls";
903 case V4L2_CID_TUNE_DEEMPHASIS: return "De-Emphasis";
904 case V4L2_CID_RDS_RECEPTION: return "RDS Reception";
905 case V4L2_CID_RF_TUNER_CLASS: return "RF Tuner Controls";
906 case V4L2_CID_RF_TUNER_RF_GAIN: return "RF Gain";
907 case V4L2_CID_RF_TUNER_LNA_GAIN_AUTO: return "LNA Gain, Auto";
908 case V4L2_CID_RF_TUNER_LNA_GAIN: return "LNA Gain";
909 case V4L2_CID_RF_TUNER_MIXER_GAIN_AUTO: return "Mixer Gain, Auto";
910 case V4L2_CID_RF_TUNER_MIXER_GAIN: return "Mixer Gain";
911 case V4L2_CID_RF_TUNER_IF_GAIN_AUTO: return "IF Gain, Auto";
912 case V4L2_CID_RF_TUNER_IF_GAIN: return "IF Gain";
913 case V4L2_CID_RF_TUNER_BANDWIDTH_AUTO: return "Bandwidth, Auto";
914 case V4L2_CID_RF_TUNER_BANDWIDTH: return "Bandwidth";
915 case V4L2_CID_RF_TUNER_PLL_LOCK: return "PLL Lock";
916 case V4L2_CID_RDS_RX_PTY: return "RDS Program Type";
917 case V4L2_CID_RDS_RX_PS_NAME: return "RDS PS Name";
918 case V4L2_CID_RDS_RX_RADIO_TEXT: return "RDS Radio Text";
919 case V4L2_CID_RDS_RX_TRAFFIC_ANNOUNCEMENT: return "RDS Traffic Announcement";
920 case V4L2_CID_RDS_RX_TRAFFIC_PROGRAM: return "RDS Traffic Program";
921 case V4L2_CID_RDS_RX_MUSIC_SPEECH: return "RDS Music";
922
923 /* Detection controls */
924 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
925 case V4L2_CID_DETECT_CLASS: return "Detection Controls";
926 case V4L2_CID_DETECT_MD_MODE: return "Motion Detection Mode";
927 case V4L2_CID_DETECT_MD_GLOBAL_THRESHOLD: return "MD Global Threshold";
928 case V4L2_CID_DETECT_MD_THRESHOLD_GRID: return "MD Threshold Grid";
929 case V4L2_CID_DETECT_MD_REGION_GRID: return "MD Region Grid";
930 default:
931 return NULL;
932 }
933 }
934 EXPORT_SYMBOL(v4l2_ctrl_get_name);
935
v4l2_ctrl_fill(u32 id,const char ** name,enum v4l2_ctrl_type * type,s64 * min,s64 * max,u64 * step,s64 * def,u32 * flags)936 void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type,
937 s64 *min, s64 *max, u64 *step, s64 *def, u32 *flags)
938 {
939 *name = v4l2_ctrl_get_name(id);
940 *flags = 0;
941
942 switch (id) {
943 case V4L2_CID_AUDIO_MUTE:
944 case V4L2_CID_AUDIO_LOUDNESS:
945 case V4L2_CID_AUTO_WHITE_BALANCE:
946 case V4L2_CID_AUTOGAIN:
947 case V4L2_CID_HFLIP:
948 case V4L2_CID_VFLIP:
949 case V4L2_CID_HUE_AUTO:
950 case V4L2_CID_CHROMA_AGC:
951 case V4L2_CID_COLOR_KILLER:
952 case V4L2_CID_AUTOBRIGHTNESS:
953 case V4L2_CID_MPEG_AUDIO_MUTE:
954 case V4L2_CID_MPEG_VIDEO_MUTE:
955 case V4L2_CID_MPEG_VIDEO_GOP_CLOSURE:
956 case V4L2_CID_MPEG_VIDEO_PULLDOWN:
957 case V4L2_CID_EXPOSURE_AUTO_PRIORITY:
958 case V4L2_CID_FOCUS_AUTO:
959 case V4L2_CID_PRIVACY:
960 case V4L2_CID_AUDIO_LIMITER_ENABLED:
961 case V4L2_CID_AUDIO_COMPRESSION_ENABLED:
962 case V4L2_CID_PILOT_TONE_ENABLED:
963 case V4L2_CID_ILLUMINATORS_1:
964 case V4L2_CID_ILLUMINATORS_2:
965 case V4L2_CID_FLASH_STROBE_STATUS:
966 case V4L2_CID_FLASH_CHARGE:
967 case V4L2_CID_FLASH_READY:
968 case V4L2_CID_MPEG_VIDEO_DECODER_MPEG4_DEBLOCK_FILTER:
969 case V4L2_CID_MPEG_VIDEO_DECODER_SLICE_INTERFACE:
970 case V4L2_CID_MPEG_VIDEO_FRAME_RC_ENABLE:
971 case V4L2_CID_MPEG_VIDEO_MB_RC_ENABLE:
972 case V4L2_CID_MPEG_VIDEO_H264_8X8_TRANSFORM:
973 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_ENABLE:
974 case V4L2_CID_MPEG_VIDEO_MPEG4_QPEL:
975 case V4L2_CID_MPEG_VIDEO_REPEAT_SEQ_HEADER:
976 case V4L2_CID_WIDE_DYNAMIC_RANGE:
977 case V4L2_CID_IMAGE_STABILIZATION:
978 case V4L2_CID_RDS_RECEPTION:
979 case V4L2_CID_RF_TUNER_LNA_GAIN_AUTO:
980 case V4L2_CID_RF_TUNER_MIXER_GAIN_AUTO:
981 case V4L2_CID_RF_TUNER_IF_GAIN_AUTO:
982 case V4L2_CID_RF_TUNER_BANDWIDTH_AUTO:
983 case V4L2_CID_RF_TUNER_PLL_LOCK:
984 case V4L2_CID_RDS_TX_MONO_STEREO:
985 case V4L2_CID_RDS_TX_ARTIFICIAL_HEAD:
986 case V4L2_CID_RDS_TX_COMPRESSED:
987 case V4L2_CID_RDS_TX_DYNAMIC_PTY:
988 case V4L2_CID_RDS_TX_TRAFFIC_ANNOUNCEMENT:
989 case V4L2_CID_RDS_TX_TRAFFIC_PROGRAM:
990 case V4L2_CID_RDS_TX_MUSIC_SPEECH:
991 case V4L2_CID_RDS_TX_ALT_FREQS_ENABLE:
992 case V4L2_CID_RDS_RX_TRAFFIC_ANNOUNCEMENT:
993 case V4L2_CID_RDS_RX_TRAFFIC_PROGRAM:
994 case V4L2_CID_RDS_RX_MUSIC_SPEECH:
995 *type = V4L2_CTRL_TYPE_BOOLEAN;
996 *min = 0;
997 *max = *step = 1;
998 break;
999 case V4L2_CID_MPEG_VIDEO_MV_H_SEARCH_RANGE:
1000 case V4L2_CID_MPEG_VIDEO_MV_V_SEARCH_RANGE:
1001 *type = V4L2_CTRL_TYPE_INTEGER;
1002 break;
1003 case V4L2_CID_MPEG_VIDEO_FORCE_KEY_FRAME:
1004 case V4L2_CID_PAN_RESET:
1005 case V4L2_CID_TILT_RESET:
1006 case V4L2_CID_FLASH_STROBE:
1007 case V4L2_CID_FLASH_STROBE_STOP:
1008 case V4L2_CID_AUTO_FOCUS_START:
1009 case V4L2_CID_AUTO_FOCUS_STOP:
1010 *type = V4L2_CTRL_TYPE_BUTTON;
1011 *flags |= V4L2_CTRL_FLAG_WRITE_ONLY |
1012 V4L2_CTRL_FLAG_EXECUTE_ON_WRITE;
1013 *min = *max = *step = *def = 0;
1014 break;
1015 case V4L2_CID_POWER_LINE_FREQUENCY:
1016 case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ:
1017 case V4L2_CID_MPEG_AUDIO_ENCODING:
1018 case V4L2_CID_MPEG_AUDIO_L1_BITRATE:
1019 case V4L2_CID_MPEG_AUDIO_L2_BITRATE:
1020 case V4L2_CID_MPEG_AUDIO_L3_BITRATE:
1021 case V4L2_CID_MPEG_AUDIO_AC3_BITRATE:
1022 case V4L2_CID_MPEG_AUDIO_MODE:
1023 case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION:
1024 case V4L2_CID_MPEG_AUDIO_EMPHASIS:
1025 case V4L2_CID_MPEG_AUDIO_CRC:
1026 case V4L2_CID_MPEG_AUDIO_DEC_PLAYBACK:
1027 case V4L2_CID_MPEG_AUDIO_DEC_MULTILINGUAL_PLAYBACK:
1028 case V4L2_CID_MPEG_VIDEO_ENCODING:
1029 case V4L2_CID_MPEG_VIDEO_ASPECT:
1030 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
1031 case V4L2_CID_MPEG_STREAM_TYPE:
1032 case V4L2_CID_MPEG_STREAM_VBI_FMT:
1033 case V4L2_CID_EXPOSURE_AUTO:
1034 case V4L2_CID_AUTO_FOCUS_RANGE:
1035 case V4L2_CID_COLORFX:
1036 case V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE:
1037 case V4L2_CID_TUNE_PREEMPHASIS:
1038 case V4L2_CID_FLASH_LED_MODE:
1039 case V4L2_CID_FLASH_STROBE_SOURCE:
1040 case V4L2_CID_MPEG_VIDEO_HEADER_MODE:
1041 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE:
1042 case V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE:
1043 case V4L2_CID_MPEG_VIDEO_H264_LEVEL:
1044 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE:
1045 case V4L2_CID_MPEG_VIDEO_H264_PROFILE:
1046 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC:
1047 case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE:
1048 case V4L2_CID_MPEG_VIDEO_H264_FMO_MAP_TYPE:
1049 case V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL:
1050 case V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE:
1051 case V4L2_CID_JPEG_CHROMA_SUBSAMPLING:
1052 case V4L2_CID_ISO_SENSITIVITY_AUTO:
1053 case V4L2_CID_EXPOSURE_METERING:
1054 case V4L2_CID_SCENE_MODE:
1055 case V4L2_CID_DV_TX_MODE:
1056 case V4L2_CID_DV_TX_RGB_RANGE:
1057 case V4L2_CID_DV_TX_IT_CONTENT_TYPE:
1058 case V4L2_CID_DV_RX_RGB_RANGE:
1059 case V4L2_CID_DV_RX_IT_CONTENT_TYPE:
1060 case V4L2_CID_TEST_PATTERN:
1061 case V4L2_CID_TUNE_DEEMPHASIS:
1062 case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_SEL:
1063 case V4L2_CID_DETECT_MD_MODE:
1064 *type = V4L2_CTRL_TYPE_MENU;
1065 break;
1066 case V4L2_CID_LINK_FREQ:
1067 *type = V4L2_CTRL_TYPE_INTEGER_MENU;
1068 break;
1069 case V4L2_CID_RDS_TX_PS_NAME:
1070 case V4L2_CID_RDS_TX_RADIO_TEXT:
1071 case V4L2_CID_RDS_RX_PS_NAME:
1072 case V4L2_CID_RDS_RX_RADIO_TEXT:
1073 *type = V4L2_CTRL_TYPE_STRING;
1074 break;
1075 case V4L2_CID_ISO_SENSITIVITY:
1076 case V4L2_CID_AUTO_EXPOSURE_BIAS:
1077 case V4L2_CID_MPEG_VIDEO_VPX_NUM_PARTITIONS:
1078 case V4L2_CID_MPEG_VIDEO_VPX_NUM_REF_FRAMES:
1079 *type = V4L2_CTRL_TYPE_INTEGER_MENU;
1080 break;
1081 case V4L2_CID_USER_CLASS:
1082 case V4L2_CID_CAMERA_CLASS:
1083 case V4L2_CID_MPEG_CLASS:
1084 case V4L2_CID_FM_TX_CLASS:
1085 case V4L2_CID_FLASH_CLASS:
1086 case V4L2_CID_JPEG_CLASS:
1087 case V4L2_CID_IMAGE_SOURCE_CLASS:
1088 case V4L2_CID_IMAGE_PROC_CLASS:
1089 case V4L2_CID_DV_CLASS:
1090 case V4L2_CID_FM_RX_CLASS:
1091 case V4L2_CID_RF_TUNER_CLASS:
1092 case V4L2_CID_DETECT_CLASS:
1093 *type = V4L2_CTRL_TYPE_CTRL_CLASS;
1094 /* You can neither read not write these */
1095 *flags |= V4L2_CTRL_FLAG_READ_ONLY | V4L2_CTRL_FLAG_WRITE_ONLY;
1096 *min = *max = *step = *def = 0;
1097 break;
1098 case V4L2_CID_BG_COLOR:
1099 *type = V4L2_CTRL_TYPE_INTEGER;
1100 *step = 1;
1101 *min = 0;
1102 /* Max is calculated as RGB888 that is 2^24 */
1103 *max = 0xFFFFFF;
1104 break;
1105 case V4L2_CID_FLASH_FAULT:
1106 case V4L2_CID_JPEG_ACTIVE_MARKER:
1107 case V4L2_CID_3A_LOCK:
1108 case V4L2_CID_AUTO_FOCUS_STATUS:
1109 case V4L2_CID_DV_TX_HOTPLUG:
1110 case V4L2_CID_DV_TX_RXSENSE:
1111 case V4L2_CID_DV_TX_EDID_PRESENT:
1112 case V4L2_CID_DV_RX_POWER_PRESENT:
1113 *type = V4L2_CTRL_TYPE_BITMASK;
1114 break;
1115 case V4L2_CID_MIN_BUFFERS_FOR_CAPTURE:
1116 case V4L2_CID_MIN_BUFFERS_FOR_OUTPUT:
1117 *type = V4L2_CTRL_TYPE_INTEGER;
1118 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
1119 break;
1120 case V4L2_CID_MPEG_VIDEO_DEC_PTS:
1121 *type = V4L2_CTRL_TYPE_INTEGER64;
1122 *flags |= V4L2_CTRL_FLAG_VOLATILE | V4L2_CTRL_FLAG_READ_ONLY;
1123 *min = *def = 0;
1124 *max = 0x1ffffffffLL;
1125 *step = 1;
1126 break;
1127 case V4L2_CID_MPEG_VIDEO_DEC_FRAME:
1128 *type = V4L2_CTRL_TYPE_INTEGER64;
1129 *flags |= V4L2_CTRL_FLAG_VOLATILE | V4L2_CTRL_FLAG_READ_ONLY;
1130 *min = *def = 0;
1131 *max = 0x7fffffffffffffffLL;
1132 *step = 1;
1133 break;
1134 case V4L2_CID_PIXEL_RATE:
1135 *type = V4L2_CTRL_TYPE_INTEGER64;
1136 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
1137 break;
1138 case V4L2_CID_DETECT_MD_REGION_GRID:
1139 *type = V4L2_CTRL_TYPE_U8;
1140 break;
1141 case V4L2_CID_DETECT_MD_THRESHOLD_GRID:
1142 *type = V4L2_CTRL_TYPE_U16;
1143 break;
1144 case V4L2_CID_RDS_TX_ALT_FREQS:
1145 *type = V4L2_CTRL_TYPE_U32;
1146 break;
1147 default:
1148 *type = V4L2_CTRL_TYPE_INTEGER;
1149 break;
1150 }
1151 switch (id) {
1152 case V4L2_CID_MPEG_AUDIO_ENCODING:
1153 case V4L2_CID_MPEG_AUDIO_MODE:
1154 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
1155 case V4L2_CID_MPEG_VIDEO_B_FRAMES:
1156 case V4L2_CID_MPEG_STREAM_TYPE:
1157 *flags |= V4L2_CTRL_FLAG_UPDATE;
1158 break;
1159 case V4L2_CID_AUDIO_VOLUME:
1160 case V4L2_CID_AUDIO_BALANCE:
1161 case V4L2_CID_AUDIO_BASS:
1162 case V4L2_CID_AUDIO_TREBLE:
1163 case V4L2_CID_BRIGHTNESS:
1164 case V4L2_CID_CONTRAST:
1165 case V4L2_CID_SATURATION:
1166 case V4L2_CID_HUE:
1167 case V4L2_CID_RED_BALANCE:
1168 case V4L2_CID_BLUE_BALANCE:
1169 case V4L2_CID_GAMMA:
1170 case V4L2_CID_SHARPNESS:
1171 case V4L2_CID_CHROMA_GAIN:
1172 case V4L2_CID_RDS_TX_DEVIATION:
1173 case V4L2_CID_AUDIO_LIMITER_RELEASE_TIME:
1174 case V4L2_CID_AUDIO_LIMITER_DEVIATION:
1175 case V4L2_CID_AUDIO_COMPRESSION_GAIN:
1176 case V4L2_CID_AUDIO_COMPRESSION_THRESHOLD:
1177 case V4L2_CID_AUDIO_COMPRESSION_ATTACK_TIME:
1178 case V4L2_CID_AUDIO_COMPRESSION_RELEASE_TIME:
1179 case V4L2_CID_PILOT_TONE_DEVIATION:
1180 case V4L2_CID_PILOT_TONE_FREQUENCY:
1181 case V4L2_CID_TUNE_POWER_LEVEL:
1182 case V4L2_CID_TUNE_ANTENNA_CAPACITOR:
1183 case V4L2_CID_RF_TUNER_RF_GAIN:
1184 case V4L2_CID_RF_TUNER_LNA_GAIN:
1185 case V4L2_CID_RF_TUNER_MIXER_GAIN:
1186 case V4L2_CID_RF_TUNER_IF_GAIN:
1187 case V4L2_CID_RF_TUNER_BANDWIDTH:
1188 case V4L2_CID_DETECT_MD_GLOBAL_THRESHOLD:
1189 *flags |= V4L2_CTRL_FLAG_SLIDER;
1190 break;
1191 case V4L2_CID_PAN_RELATIVE:
1192 case V4L2_CID_TILT_RELATIVE:
1193 case V4L2_CID_FOCUS_RELATIVE:
1194 case V4L2_CID_IRIS_RELATIVE:
1195 case V4L2_CID_ZOOM_RELATIVE:
1196 *flags |= V4L2_CTRL_FLAG_WRITE_ONLY |
1197 V4L2_CTRL_FLAG_EXECUTE_ON_WRITE;
1198 break;
1199 case V4L2_CID_FLASH_STROBE_STATUS:
1200 case V4L2_CID_AUTO_FOCUS_STATUS:
1201 case V4L2_CID_FLASH_READY:
1202 case V4L2_CID_DV_TX_HOTPLUG:
1203 case V4L2_CID_DV_TX_RXSENSE:
1204 case V4L2_CID_DV_TX_EDID_PRESENT:
1205 case V4L2_CID_DV_RX_POWER_PRESENT:
1206 case V4L2_CID_DV_RX_IT_CONTENT_TYPE:
1207 case V4L2_CID_RDS_RX_PTY:
1208 case V4L2_CID_RDS_RX_PS_NAME:
1209 case V4L2_CID_RDS_RX_RADIO_TEXT:
1210 case V4L2_CID_RDS_RX_TRAFFIC_ANNOUNCEMENT:
1211 case V4L2_CID_RDS_RX_TRAFFIC_PROGRAM:
1212 case V4L2_CID_RDS_RX_MUSIC_SPEECH:
1213 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
1214 break;
1215 case V4L2_CID_RF_TUNER_PLL_LOCK:
1216 *flags |= V4L2_CTRL_FLAG_VOLATILE;
1217 break;
1218 }
1219 }
1220 EXPORT_SYMBOL(v4l2_ctrl_fill);
1221
user_flags(const struct v4l2_ctrl * ctrl)1222 static u32 user_flags(const struct v4l2_ctrl *ctrl)
1223 {
1224 u32 flags = ctrl->flags;
1225
1226 if (ctrl->is_ptr)
1227 flags |= V4L2_CTRL_FLAG_HAS_PAYLOAD;
1228
1229 return flags;
1230 }
1231
fill_event(struct v4l2_event * ev,struct v4l2_ctrl * ctrl,u32 changes)1232 static void fill_event(struct v4l2_event *ev, struct v4l2_ctrl *ctrl, u32 changes)
1233 {
1234 memset(ev->reserved, 0, sizeof(ev->reserved));
1235 ev->type = V4L2_EVENT_CTRL;
1236 ev->id = ctrl->id;
1237 ev->u.ctrl.changes = changes;
1238 ev->u.ctrl.type = ctrl->type;
1239 ev->u.ctrl.flags = user_flags(ctrl);
1240 if (ctrl->is_ptr)
1241 ev->u.ctrl.value64 = 0;
1242 else
1243 ev->u.ctrl.value64 = *ctrl->p_cur.p_s64;
1244 ev->u.ctrl.minimum = ctrl->minimum;
1245 ev->u.ctrl.maximum = ctrl->maximum;
1246 if (ctrl->type == V4L2_CTRL_TYPE_MENU
1247 || ctrl->type == V4L2_CTRL_TYPE_INTEGER_MENU)
1248 ev->u.ctrl.step = 1;
1249 else
1250 ev->u.ctrl.step = ctrl->step;
1251 ev->u.ctrl.default_value = ctrl->default_value;
1252 }
1253
send_event(struct v4l2_fh * fh,struct v4l2_ctrl * ctrl,u32 changes)1254 static void send_event(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, u32 changes)
1255 {
1256 struct v4l2_event ev;
1257 struct v4l2_subscribed_event *sev;
1258
1259 if (list_empty(&ctrl->ev_subs))
1260 return;
1261 fill_event(&ev, ctrl, changes);
1262
1263 list_for_each_entry(sev, &ctrl->ev_subs, node)
1264 if (sev->fh != fh ||
1265 (sev->flags & V4L2_EVENT_SUB_FL_ALLOW_FEEDBACK))
1266 v4l2_event_queue_fh(sev->fh, &ev);
1267 }
1268
std_equal(const struct v4l2_ctrl * ctrl,u32 idx,union v4l2_ctrl_ptr ptr1,union v4l2_ctrl_ptr ptr2)1269 static bool std_equal(const struct v4l2_ctrl *ctrl, u32 idx,
1270 union v4l2_ctrl_ptr ptr1,
1271 union v4l2_ctrl_ptr ptr2)
1272 {
1273 switch (ctrl->type) {
1274 case V4L2_CTRL_TYPE_BUTTON:
1275 return false;
1276 case V4L2_CTRL_TYPE_STRING:
1277 idx *= ctrl->elem_size;
1278 /* strings are always 0-terminated */
1279 return !strcmp(ptr1.p_char + idx, ptr2.p_char + idx);
1280 case V4L2_CTRL_TYPE_INTEGER64:
1281 return ptr1.p_s64[idx] == ptr2.p_s64[idx];
1282 case V4L2_CTRL_TYPE_U8:
1283 return ptr1.p_u8[idx] == ptr2.p_u8[idx];
1284 case V4L2_CTRL_TYPE_U16:
1285 return ptr1.p_u16[idx] == ptr2.p_u16[idx];
1286 case V4L2_CTRL_TYPE_U32:
1287 return ptr1.p_u32[idx] == ptr2.p_u32[idx];
1288 default:
1289 if (ctrl->is_int)
1290 return ptr1.p_s32[idx] == ptr2.p_s32[idx];
1291 idx *= ctrl->elem_size;
1292 return !memcmp(ptr1.p + idx, ptr2.p + idx, ctrl->elem_size);
1293 }
1294 }
1295
std_init(const struct v4l2_ctrl * ctrl,u32 idx,union v4l2_ctrl_ptr ptr)1296 static void std_init(const struct v4l2_ctrl *ctrl, u32 idx,
1297 union v4l2_ctrl_ptr ptr)
1298 {
1299 switch (ctrl->type) {
1300 case V4L2_CTRL_TYPE_STRING:
1301 idx *= ctrl->elem_size;
1302 memset(ptr.p_char + idx, ' ', ctrl->minimum);
1303 ptr.p_char[idx + ctrl->minimum] = '\0';
1304 break;
1305 case V4L2_CTRL_TYPE_INTEGER64:
1306 ptr.p_s64[idx] = ctrl->default_value;
1307 break;
1308 case V4L2_CTRL_TYPE_INTEGER:
1309 case V4L2_CTRL_TYPE_INTEGER_MENU:
1310 case V4L2_CTRL_TYPE_MENU:
1311 case V4L2_CTRL_TYPE_BITMASK:
1312 case V4L2_CTRL_TYPE_BOOLEAN:
1313 ptr.p_s32[idx] = ctrl->default_value;
1314 break;
1315 case V4L2_CTRL_TYPE_U8:
1316 ptr.p_u8[idx] = ctrl->default_value;
1317 break;
1318 case V4L2_CTRL_TYPE_U16:
1319 ptr.p_u16[idx] = ctrl->default_value;
1320 break;
1321 case V4L2_CTRL_TYPE_U32:
1322 ptr.p_u32[idx] = ctrl->default_value;
1323 break;
1324 default:
1325 idx *= ctrl->elem_size;
1326 memset(ptr.p + idx, 0, ctrl->elem_size);
1327 break;
1328 }
1329 }
1330
std_log(const struct v4l2_ctrl * ctrl)1331 static void std_log(const struct v4l2_ctrl *ctrl)
1332 {
1333 union v4l2_ctrl_ptr ptr = ctrl->p_cur;
1334
1335 if (ctrl->is_array) {
1336 unsigned i;
1337
1338 for (i = 0; i < ctrl->nr_of_dims; i++)
1339 pr_cont("[%u]", ctrl->dims[i]);
1340 pr_cont(" ");
1341 }
1342
1343 switch (ctrl->type) {
1344 case V4L2_CTRL_TYPE_INTEGER:
1345 pr_cont("%d", *ptr.p_s32);
1346 break;
1347 case V4L2_CTRL_TYPE_BOOLEAN:
1348 pr_cont("%s", *ptr.p_s32 ? "true" : "false");
1349 break;
1350 case V4L2_CTRL_TYPE_MENU:
1351 pr_cont("%s", ctrl->qmenu[*ptr.p_s32]);
1352 break;
1353 case V4L2_CTRL_TYPE_INTEGER_MENU:
1354 pr_cont("%lld", ctrl->qmenu_int[*ptr.p_s32]);
1355 break;
1356 case V4L2_CTRL_TYPE_BITMASK:
1357 pr_cont("0x%08x", *ptr.p_s32);
1358 break;
1359 case V4L2_CTRL_TYPE_INTEGER64:
1360 pr_cont("%lld", *ptr.p_s64);
1361 break;
1362 case V4L2_CTRL_TYPE_STRING:
1363 pr_cont("%s", ptr.p_char);
1364 break;
1365 case V4L2_CTRL_TYPE_U8:
1366 pr_cont("%u", (unsigned)*ptr.p_u8);
1367 break;
1368 case V4L2_CTRL_TYPE_U16:
1369 pr_cont("%u", (unsigned)*ptr.p_u16);
1370 break;
1371 case V4L2_CTRL_TYPE_U32:
1372 pr_cont("%u", (unsigned)*ptr.p_u32);
1373 break;
1374 default:
1375 pr_cont("unknown type %d", ctrl->type);
1376 break;
1377 }
1378 }
1379
1380 /*
1381 * Round towards the closest legal value. Be careful when we are
1382 * close to the maximum range of the control type to prevent
1383 * wrap-arounds.
1384 */
1385 #define ROUND_TO_RANGE(val, offset_type, ctrl) \
1386 ({ \
1387 offset_type offset; \
1388 if ((ctrl)->maximum >= 0 && \
1389 val >= (ctrl)->maximum - (s32)((ctrl)->step / 2)) \
1390 val = (ctrl)->maximum; \
1391 else \
1392 val += (s32)((ctrl)->step / 2); \
1393 val = clamp_t(typeof(val), val, \
1394 (ctrl)->minimum, (ctrl)->maximum); \
1395 offset = (val) - (ctrl)->minimum; \
1396 offset = (ctrl)->step * (offset / (u32)(ctrl)->step); \
1397 val = (ctrl)->minimum + offset; \
1398 0; \
1399 })
1400
1401 /* Validate a new control */
std_validate(const struct v4l2_ctrl * ctrl,u32 idx,union v4l2_ctrl_ptr ptr)1402 static int std_validate(const struct v4l2_ctrl *ctrl, u32 idx,
1403 union v4l2_ctrl_ptr ptr)
1404 {
1405 size_t len;
1406 u64 offset;
1407 s64 val;
1408
1409 switch (ctrl->type) {
1410 case V4L2_CTRL_TYPE_INTEGER:
1411 return ROUND_TO_RANGE(ptr.p_s32[idx], u32, ctrl);
1412 case V4L2_CTRL_TYPE_INTEGER64:
1413 /*
1414 * We can't use the ROUND_TO_RANGE define here due to
1415 * the u64 divide that needs special care.
1416 */
1417 val = ptr.p_s64[idx];
1418 if (ctrl->maximum >= 0 && val >= ctrl->maximum - (s64)(ctrl->step / 2))
1419 val = ctrl->maximum;
1420 else
1421 val += (s64)(ctrl->step / 2);
1422 val = clamp_t(s64, val, ctrl->minimum, ctrl->maximum);
1423 offset = val - ctrl->minimum;
1424 do_div(offset, ctrl->step);
1425 ptr.p_s64[idx] = ctrl->minimum + offset * ctrl->step;
1426 return 0;
1427 case V4L2_CTRL_TYPE_U8:
1428 return ROUND_TO_RANGE(ptr.p_u8[idx], u8, ctrl);
1429 case V4L2_CTRL_TYPE_U16:
1430 return ROUND_TO_RANGE(ptr.p_u16[idx], u16, ctrl);
1431 case V4L2_CTRL_TYPE_U32:
1432 return ROUND_TO_RANGE(ptr.p_u32[idx], u32, ctrl);
1433
1434 case V4L2_CTRL_TYPE_BOOLEAN:
1435 ptr.p_s32[idx] = !!ptr.p_s32[idx];
1436 return 0;
1437
1438 case V4L2_CTRL_TYPE_MENU:
1439 case V4L2_CTRL_TYPE_INTEGER_MENU:
1440 if (ptr.p_s32[idx] < ctrl->minimum || ptr.p_s32[idx] > ctrl->maximum)
1441 return -ERANGE;
1442 if (ctrl->menu_skip_mask & (1 << ptr.p_s32[idx]))
1443 return -EINVAL;
1444 if (ctrl->type == V4L2_CTRL_TYPE_MENU &&
1445 ctrl->qmenu[ptr.p_s32[idx]][0] == '\0')
1446 return -EINVAL;
1447 return 0;
1448
1449 case V4L2_CTRL_TYPE_BITMASK:
1450 ptr.p_s32[idx] &= ctrl->maximum;
1451 return 0;
1452
1453 case V4L2_CTRL_TYPE_BUTTON:
1454 case V4L2_CTRL_TYPE_CTRL_CLASS:
1455 ptr.p_s32[idx] = 0;
1456 return 0;
1457
1458 case V4L2_CTRL_TYPE_STRING:
1459 idx *= ctrl->elem_size;
1460 len = strlen(ptr.p_char + idx);
1461 if (len < ctrl->minimum)
1462 return -ERANGE;
1463 if ((len - (u32)ctrl->minimum) % (u32)ctrl->step)
1464 return -ERANGE;
1465 return 0;
1466
1467 default:
1468 return -EINVAL;
1469 }
1470 }
1471
1472 static const struct v4l2_ctrl_type_ops std_type_ops = {
1473 .equal = std_equal,
1474 .init = std_init,
1475 .log = std_log,
1476 .validate = std_validate,
1477 };
1478
1479 /* Helper function: copy the given control value back to the caller */
ptr_to_user(struct v4l2_ext_control * c,struct v4l2_ctrl * ctrl,union v4l2_ctrl_ptr ptr)1480 static int ptr_to_user(struct v4l2_ext_control *c,
1481 struct v4l2_ctrl *ctrl,
1482 union v4l2_ctrl_ptr ptr)
1483 {
1484 u32 len;
1485
1486 if (ctrl->is_ptr && !ctrl->is_string)
1487 return copy_to_user(c->ptr, ptr.p, c->size) ?
1488 -EFAULT : 0;
1489
1490 switch (ctrl->type) {
1491 case V4L2_CTRL_TYPE_STRING:
1492 len = strlen(ptr.p_char);
1493 if (c->size < len + 1) {
1494 c->size = ctrl->elem_size;
1495 return -ENOSPC;
1496 }
1497 return copy_to_user(c->string, ptr.p_char, len + 1) ?
1498 -EFAULT : 0;
1499 case V4L2_CTRL_TYPE_INTEGER64:
1500 c->value64 = *ptr.p_s64;
1501 break;
1502 default:
1503 c->value = *ptr.p_s32;
1504 break;
1505 }
1506 return 0;
1507 }
1508
1509 /* Helper function: copy the current control value back to the caller */
cur_to_user(struct v4l2_ext_control * c,struct v4l2_ctrl * ctrl)1510 static int cur_to_user(struct v4l2_ext_control *c,
1511 struct v4l2_ctrl *ctrl)
1512 {
1513 return ptr_to_user(c, ctrl, ctrl->p_cur);
1514 }
1515
1516 /* Helper function: copy the new control value back to the caller */
new_to_user(struct v4l2_ext_control * c,struct v4l2_ctrl * ctrl)1517 static int new_to_user(struct v4l2_ext_control *c,
1518 struct v4l2_ctrl *ctrl)
1519 {
1520 return ptr_to_user(c, ctrl, ctrl->p_new);
1521 }
1522
1523 /* Helper function: copy the initial control value back to the caller */
def_to_user(struct v4l2_ext_control * c,struct v4l2_ctrl * ctrl)1524 static int def_to_user(struct v4l2_ext_control *c, struct v4l2_ctrl *ctrl)
1525 {
1526 int idx;
1527
1528 for (idx = 0; idx < ctrl->elems; idx++)
1529 ctrl->type_ops->init(ctrl, idx, ctrl->p_new);
1530
1531 return ptr_to_user(c, ctrl, ctrl->p_new);
1532 }
1533
1534 /* Helper function: copy the caller-provider value to the given control value */
user_to_ptr(struct v4l2_ext_control * c,struct v4l2_ctrl * ctrl,union v4l2_ctrl_ptr ptr)1535 static int user_to_ptr(struct v4l2_ext_control *c,
1536 struct v4l2_ctrl *ctrl,
1537 union v4l2_ctrl_ptr ptr)
1538 {
1539 int ret;
1540 u32 size;
1541
1542 ctrl->is_new = 1;
1543 if (ctrl->is_ptr && !ctrl->is_string) {
1544 unsigned idx;
1545
1546 ret = copy_from_user(ptr.p, c->ptr, c->size) ? -EFAULT : 0;
1547 if (ret || !ctrl->is_array)
1548 return ret;
1549 for (idx = c->size / ctrl->elem_size; idx < ctrl->elems; idx++)
1550 ctrl->type_ops->init(ctrl, idx, ptr);
1551 return 0;
1552 }
1553
1554 switch (ctrl->type) {
1555 case V4L2_CTRL_TYPE_INTEGER64:
1556 *ptr.p_s64 = c->value64;
1557 break;
1558 case V4L2_CTRL_TYPE_STRING:
1559 size = c->size;
1560 if (size == 0)
1561 return -ERANGE;
1562 if (size > ctrl->maximum + 1)
1563 size = ctrl->maximum + 1;
1564 ret = copy_from_user(ptr.p_char, c->string, size) ? -EFAULT : 0;
1565 if (!ret) {
1566 char last = ptr.p_char[size - 1];
1567
1568 ptr.p_char[size - 1] = 0;
1569 /* If the string was longer than ctrl->maximum,
1570 then return an error. */
1571 if (strlen(ptr.p_char) == ctrl->maximum && last)
1572 return -ERANGE;
1573 }
1574 return ret;
1575 default:
1576 *ptr.p_s32 = c->value;
1577 break;
1578 }
1579 return 0;
1580 }
1581
1582 /* Helper function: copy the caller-provider value as the new control value */
user_to_new(struct v4l2_ext_control * c,struct v4l2_ctrl * ctrl)1583 static int user_to_new(struct v4l2_ext_control *c,
1584 struct v4l2_ctrl *ctrl)
1585 {
1586 return user_to_ptr(c, ctrl, ctrl->p_new);
1587 }
1588
1589 /* Copy the one value to another. */
ptr_to_ptr(struct v4l2_ctrl * ctrl,union v4l2_ctrl_ptr from,union v4l2_ctrl_ptr to)1590 static void ptr_to_ptr(struct v4l2_ctrl *ctrl,
1591 union v4l2_ctrl_ptr from, union v4l2_ctrl_ptr to)
1592 {
1593 if (ctrl == NULL)
1594 return;
1595 memcpy(to.p, from.p, ctrl->elems * ctrl->elem_size);
1596 }
1597
1598 /* Copy the new value to the current value. */
new_to_cur(struct v4l2_fh * fh,struct v4l2_ctrl * ctrl,u32 ch_flags)1599 static void new_to_cur(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, u32 ch_flags)
1600 {
1601 bool changed;
1602
1603 if (ctrl == NULL)
1604 return;
1605
1606 /* has_changed is set by cluster_changed */
1607 changed = ctrl->has_changed;
1608 if (changed)
1609 ptr_to_ptr(ctrl, ctrl->p_new, ctrl->p_cur);
1610
1611 if (ch_flags & V4L2_EVENT_CTRL_CH_FLAGS) {
1612 /* Note: CH_FLAGS is only set for auto clusters. */
1613 ctrl->flags &=
1614 ~(V4L2_CTRL_FLAG_INACTIVE | V4L2_CTRL_FLAG_VOLATILE);
1615 if (!is_cur_manual(ctrl->cluster[0])) {
1616 ctrl->flags |= V4L2_CTRL_FLAG_INACTIVE;
1617 if (ctrl->cluster[0]->has_volatiles)
1618 ctrl->flags |= V4L2_CTRL_FLAG_VOLATILE;
1619 }
1620 fh = NULL;
1621 }
1622 if (changed || ch_flags) {
1623 /* If a control was changed that was not one of the controls
1624 modified by the application, then send the event to all. */
1625 if (!ctrl->is_new)
1626 fh = NULL;
1627 send_event(fh, ctrl,
1628 (changed ? V4L2_EVENT_CTRL_CH_VALUE : 0) | ch_flags);
1629 if (ctrl->call_notify && changed && ctrl->handler->notify)
1630 ctrl->handler->notify(ctrl, ctrl->handler->notify_priv);
1631 }
1632 }
1633
1634 /* Copy the current value to the new value */
cur_to_new(struct v4l2_ctrl * ctrl)1635 static void cur_to_new(struct v4l2_ctrl *ctrl)
1636 {
1637 if (ctrl == NULL)
1638 return;
1639 ptr_to_ptr(ctrl, ctrl->p_cur, ctrl->p_new);
1640 }
1641
1642 /* Return non-zero if one or more of the controls in the cluster has a new
1643 value that differs from the current value. */
cluster_changed(struct v4l2_ctrl * master)1644 static int cluster_changed(struct v4l2_ctrl *master)
1645 {
1646 bool changed = false;
1647 unsigned idx;
1648 int i;
1649
1650 for (i = 0; i < master->ncontrols; i++) {
1651 struct v4l2_ctrl *ctrl = master->cluster[i];
1652 bool ctrl_changed = false;
1653
1654 if (ctrl == NULL)
1655 continue;
1656
1657 if (ctrl->flags & V4L2_CTRL_FLAG_EXECUTE_ON_WRITE)
1658 changed = ctrl_changed = true;
1659
1660 /*
1661 * Set has_changed to false to avoid generating
1662 * the event V4L2_EVENT_CTRL_CH_VALUE
1663 */
1664 if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE) {
1665 ctrl->has_changed = false;
1666 continue;
1667 }
1668
1669 for (idx = 0; !ctrl_changed && idx < ctrl->elems; idx++)
1670 ctrl_changed = !ctrl->type_ops->equal(ctrl, idx,
1671 ctrl->p_cur, ctrl->p_new);
1672 ctrl->has_changed = ctrl_changed;
1673 changed |= ctrl->has_changed;
1674 }
1675 return changed;
1676 }
1677
1678 /* Control range checking */
check_range(enum v4l2_ctrl_type type,s64 min,s64 max,u64 step,s64 def)1679 static int check_range(enum v4l2_ctrl_type type,
1680 s64 min, s64 max, u64 step, s64 def)
1681 {
1682 switch (type) {
1683 case V4L2_CTRL_TYPE_BOOLEAN:
1684 if (step != 1 || max > 1 || min < 0)
1685 return -ERANGE;
1686 /* fall through */
1687 case V4L2_CTRL_TYPE_U8:
1688 case V4L2_CTRL_TYPE_U16:
1689 case V4L2_CTRL_TYPE_U32:
1690 case V4L2_CTRL_TYPE_INTEGER:
1691 case V4L2_CTRL_TYPE_INTEGER64:
1692 if (step == 0 || min > max || def < min || def > max)
1693 return -ERANGE;
1694 return 0;
1695 case V4L2_CTRL_TYPE_BITMASK:
1696 if (step || min || !max || (def & ~max))
1697 return -ERANGE;
1698 return 0;
1699 case V4L2_CTRL_TYPE_MENU:
1700 case V4L2_CTRL_TYPE_INTEGER_MENU:
1701 if (min > max || def < min || def > max)
1702 return -ERANGE;
1703 /* Note: step == menu_skip_mask for menu controls.
1704 So here we check if the default value is masked out. */
1705 if (step && ((1 << def) & step))
1706 return -EINVAL;
1707 return 0;
1708 case V4L2_CTRL_TYPE_STRING:
1709 if (min > max || min < 0 || step < 1 || def)
1710 return -ERANGE;
1711 return 0;
1712 default:
1713 return 0;
1714 }
1715 }
1716
1717 /* Validate a new control */
validate_new(const struct v4l2_ctrl * ctrl,union v4l2_ctrl_ptr p_new)1718 static int validate_new(const struct v4l2_ctrl *ctrl, union v4l2_ctrl_ptr p_new)
1719 {
1720 unsigned idx;
1721 int err = 0;
1722
1723 for (idx = 0; !err && idx < ctrl->elems; idx++)
1724 err = ctrl->type_ops->validate(ctrl, idx, p_new);
1725 return err;
1726 }
1727
node2id(struct list_head * node)1728 static inline u32 node2id(struct list_head *node)
1729 {
1730 return list_entry(node, struct v4l2_ctrl_ref, node)->ctrl->id;
1731 }
1732
1733 /* Set the handler's error code if it wasn't set earlier already */
handler_set_err(struct v4l2_ctrl_handler * hdl,int err)1734 static inline int handler_set_err(struct v4l2_ctrl_handler *hdl, int err)
1735 {
1736 if (hdl->error == 0)
1737 hdl->error = err;
1738 return err;
1739 }
1740
1741 /* Initialize the handler */
v4l2_ctrl_handler_init_class(struct v4l2_ctrl_handler * hdl,unsigned nr_of_controls_hint,struct lock_class_key * key,const char * name)1742 int v4l2_ctrl_handler_init_class(struct v4l2_ctrl_handler *hdl,
1743 unsigned nr_of_controls_hint,
1744 struct lock_class_key *key, const char *name)
1745 {
1746 hdl->lock = &hdl->_lock;
1747 mutex_init(hdl->lock);
1748 lockdep_set_class_and_name(hdl->lock, key, name);
1749 INIT_LIST_HEAD(&hdl->ctrls);
1750 INIT_LIST_HEAD(&hdl->ctrl_refs);
1751 hdl->nr_of_buckets = 1 + nr_of_controls_hint / 8;
1752 hdl->buckets = kcalloc(hdl->nr_of_buckets, sizeof(hdl->buckets[0]),
1753 GFP_KERNEL);
1754 hdl->error = hdl->buckets ? 0 : -ENOMEM;
1755 return hdl->error;
1756 }
1757 EXPORT_SYMBOL(v4l2_ctrl_handler_init_class);
1758
1759 /* Free all controls and control refs */
v4l2_ctrl_handler_free(struct v4l2_ctrl_handler * hdl)1760 void v4l2_ctrl_handler_free(struct v4l2_ctrl_handler *hdl)
1761 {
1762 struct v4l2_ctrl_ref *ref, *next_ref;
1763 struct v4l2_ctrl *ctrl, *next_ctrl;
1764 struct v4l2_subscribed_event *sev, *next_sev;
1765
1766 if (hdl == NULL || hdl->buckets == NULL)
1767 return;
1768
1769 mutex_lock(hdl->lock);
1770 /* Free all nodes */
1771 list_for_each_entry_safe(ref, next_ref, &hdl->ctrl_refs, node) {
1772 list_del(&ref->node);
1773 kfree(ref);
1774 }
1775 /* Free all controls owned by the handler */
1776 list_for_each_entry_safe(ctrl, next_ctrl, &hdl->ctrls, node) {
1777 list_del(&ctrl->node);
1778 list_for_each_entry_safe(sev, next_sev, &ctrl->ev_subs, node)
1779 list_del(&sev->node);
1780 kfree(ctrl);
1781 }
1782 kfree(hdl->buckets);
1783 hdl->buckets = NULL;
1784 hdl->cached = NULL;
1785 hdl->error = 0;
1786 mutex_unlock(hdl->lock);
1787 }
1788 EXPORT_SYMBOL(v4l2_ctrl_handler_free);
1789
1790 /* For backwards compatibility: V4L2_CID_PRIVATE_BASE should no longer
1791 be used except in G_CTRL, S_CTRL, QUERYCTRL and QUERYMENU when dealing
1792 with applications that do not use the NEXT_CTRL flag.
1793
1794 We just find the n-th private user control. It's O(N), but that should not
1795 be an issue in this particular case. */
find_private_ref(struct v4l2_ctrl_handler * hdl,u32 id)1796 static struct v4l2_ctrl_ref *find_private_ref(
1797 struct v4l2_ctrl_handler *hdl, u32 id)
1798 {
1799 struct v4l2_ctrl_ref *ref;
1800
1801 id -= V4L2_CID_PRIVATE_BASE;
1802 list_for_each_entry(ref, &hdl->ctrl_refs, node) {
1803 /* Search for private user controls that are compatible with
1804 VIDIOC_G/S_CTRL. */
1805 if (V4L2_CTRL_ID2WHICH(ref->ctrl->id) == V4L2_CTRL_CLASS_USER &&
1806 V4L2_CTRL_DRIVER_PRIV(ref->ctrl->id)) {
1807 if (!ref->ctrl->is_int)
1808 continue;
1809 if (id == 0)
1810 return ref;
1811 id--;
1812 }
1813 }
1814 return NULL;
1815 }
1816
1817 /* Find a control with the given ID. */
find_ref(struct v4l2_ctrl_handler * hdl,u32 id)1818 static struct v4l2_ctrl_ref *find_ref(struct v4l2_ctrl_handler *hdl, u32 id)
1819 {
1820 struct v4l2_ctrl_ref *ref;
1821 int bucket;
1822
1823 id &= V4L2_CTRL_ID_MASK;
1824
1825 /* Old-style private controls need special handling */
1826 if (id >= V4L2_CID_PRIVATE_BASE)
1827 return find_private_ref(hdl, id);
1828 bucket = id % hdl->nr_of_buckets;
1829
1830 /* Simple optimization: cache the last control found */
1831 if (hdl->cached && hdl->cached->ctrl->id == id)
1832 return hdl->cached;
1833
1834 /* Not in cache, search the hash */
1835 ref = hdl->buckets ? hdl->buckets[bucket] : NULL;
1836 while (ref && ref->ctrl->id != id)
1837 ref = ref->next;
1838
1839 if (ref)
1840 hdl->cached = ref; /* cache it! */
1841 return ref;
1842 }
1843
1844 /* Find a control with the given ID. Take the handler's lock first. */
find_ref_lock(struct v4l2_ctrl_handler * hdl,u32 id)1845 static struct v4l2_ctrl_ref *find_ref_lock(
1846 struct v4l2_ctrl_handler *hdl, u32 id)
1847 {
1848 struct v4l2_ctrl_ref *ref = NULL;
1849
1850 if (hdl) {
1851 mutex_lock(hdl->lock);
1852 ref = find_ref(hdl, id);
1853 mutex_unlock(hdl->lock);
1854 }
1855 return ref;
1856 }
1857
1858 /* Find a control with the given ID. */
v4l2_ctrl_find(struct v4l2_ctrl_handler * hdl,u32 id)1859 struct v4l2_ctrl *v4l2_ctrl_find(struct v4l2_ctrl_handler *hdl, u32 id)
1860 {
1861 struct v4l2_ctrl_ref *ref = find_ref_lock(hdl, id);
1862
1863 return ref ? ref->ctrl : NULL;
1864 }
1865 EXPORT_SYMBOL(v4l2_ctrl_find);
1866
1867 /* Allocate a new v4l2_ctrl_ref and hook it into the handler. */
handler_new_ref(struct v4l2_ctrl_handler * hdl,struct v4l2_ctrl * ctrl)1868 static int handler_new_ref(struct v4l2_ctrl_handler *hdl,
1869 struct v4l2_ctrl *ctrl)
1870 {
1871 struct v4l2_ctrl_ref *ref;
1872 struct v4l2_ctrl_ref *new_ref;
1873 u32 id = ctrl->id;
1874 u32 class_ctrl = V4L2_CTRL_ID2WHICH(id) | 1;
1875 int bucket = id % hdl->nr_of_buckets; /* which bucket to use */
1876
1877 /*
1878 * Automatically add the control class if it is not yet present and
1879 * the new control is not a compound control.
1880 */
1881 if (ctrl->type < V4L2_CTRL_COMPOUND_TYPES &&
1882 id != class_ctrl && find_ref_lock(hdl, class_ctrl) == NULL)
1883 if (!v4l2_ctrl_new_std(hdl, NULL, class_ctrl, 0, 0, 0, 0))
1884 return hdl->error;
1885
1886 if (hdl->error)
1887 return hdl->error;
1888
1889 new_ref = kzalloc(sizeof(*new_ref), GFP_KERNEL);
1890 if (!new_ref)
1891 return handler_set_err(hdl, -ENOMEM);
1892 new_ref->ctrl = ctrl;
1893 if (ctrl->handler == hdl) {
1894 /* By default each control starts in a cluster of its own.
1895 new_ref->ctrl is basically a cluster array with one
1896 element, so that's perfect to use as the cluster pointer.
1897 But only do this for the handler that owns the control. */
1898 ctrl->cluster = &new_ref->ctrl;
1899 ctrl->ncontrols = 1;
1900 }
1901
1902 INIT_LIST_HEAD(&new_ref->node);
1903
1904 mutex_lock(hdl->lock);
1905
1906 /* Add immediately at the end of the list if the list is empty, or if
1907 the last element in the list has a lower ID.
1908 This ensures that when elements are added in ascending order the
1909 insertion is an O(1) operation. */
1910 if (list_empty(&hdl->ctrl_refs) || id > node2id(hdl->ctrl_refs.prev)) {
1911 list_add_tail(&new_ref->node, &hdl->ctrl_refs);
1912 goto insert_in_hash;
1913 }
1914
1915 /* Find insert position in sorted list */
1916 list_for_each_entry(ref, &hdl->ctrl_refs, node) {
1917 if (ref->ctrl->id < id)
1918 continue;
1919 /* Don't add duplicates */
1920 if (ref->ctrl->id == id) {
1921 kfree(new_ref);
1922 goto unlock;
1923 }
1924 list_add(&new_ref->node, ref->node.prev);
1925 break;
1926 }
1927
1928 insert_in_hash:
1929 /* Insert the control node in the hash */
1930 new_ref->next = hdl->buckets[bucket];
1931 hdl->buckets[bucket] = new_ref;
1932
1933 unlock:
1934 mutex_unlock(hdl->lock);
1935 return 0;
1936 }
1937
1938 /* Add a new control */
v4l2_ctrl_new(struct v4l2_ctrl_handler * hdl,const struct v4l2_ctrl_ops * ops,const struct v4l2_ctrl_type_ops * type_ops,u32 id,const char * name,enum v4l2_ctrl_type type,s64 min,s64 max,u64 step,s64 def,const u32 dims[V4L2_CTRL_MAX_DIMS],u32 elem_size,u32 flags,const char * const * qmenu,const s64 * qmenu_int,void * priv)1939 static struct v4l2_ctrl *v4l2_ctrl_new(struct v4l2_ctrl_handler *hdl,
1940 const struct v4l2_ctrl_ops *ops,
1941 const struct v4l2_ctrl_type_ops *type_ops,
1942 u32 id, const char *name, enum v4l2_ctrl_type type,
1943 s64 min, s64 max, u64 step, s64 def,
1944 const u32 dims[V4L2_CTRL_MAX_DIMS], u32 elem_size,
1945 u32 flags, const char * const *qmenu,
1946 const s64 *qmenu_int, void *priv)
1947 {
1948 struct v4l2_ctrl *ctrl;
1949 unsigned sz_extra;
1950 unsigned nr_of_dims = 0;
1951 unsigned elems = 1;
1952 bool is_array;
1953 unsigned tot_ctrl_size;
1954 unsigned idx;
1955 void *data;
1956 int err;
1957
1958 if (hdl->error)
1959 return NULL;
1960
1961 while (dims && dims[nr_of_dims]) {
1962 elems *= dims[nr_of_dims];
1963 nr_of_dims++;
1964 if (nr_of_dims == V4L2_CTRL_MAX_DIMS)
1965 break;
1966 }
1967 is_array = nr_of_dims > 0;
1968
1969 /* Prefill elem_size for all types handled by std_type_ops */
1970 switch (type) {
1971 case V4L2_CTRL_TYPE_INTEGER64:
1972 elem_size = sizeof(s64);
1973 break;
1974 case V4L2_CTRL_TYPE_STRING:
1975 elem_size = max + 1;
1976 break;
1977 case V4L2_CTRL_TYPE_U8:
1978 elem_size = sizeof(u8);
1979 break;
1980 case V4L2_CTRL_TYPE_U16:
1981 elem_size = sizeof(u16);
1982 break;
1983 case V4L2_CTRL_TYPE_U32:
1984 elem_size = sizeof(u32);
1985 break;
1986 default:
1987 if (type < V4L2_CTRL_COMPOUND_TYPES)
1988 elem_size = sizeof(s32);
1989 break;
1990 }
1991 tot_ctrl_size = elem_size * elems;
1992
1993 /* Sanity checks */
1994 if (id == 0 || name == NULL || !elem_size ||
1995 id >= V4L2_CID_PRIVATE_BASE ||
1996 (type == V4L2_CTRL_TYPE_MENU && qmenu == NULL) ||
1997 (type == V4L2_CTRL_TYPE_INTEGER_MENU && qmenu_int == NULL)) {
1998 handler_set_err(hdl, -ERANGE);
1999 return NULL;
2000 }
2001 err = check_range(type, min, max, step, def);
2002 if (err) {
2003 handler_set_err(hdl, err);
2004 return NULL;
2005 }
2006 if (type == V4L2_CTRL_TYPE_BITMASK && ((def & ~max) || min || step)) {
2007 handler_set_err(hdl, -ERANGE);
2008 return NULL;
2009 }
2010 if (is_array &&
2011 (type == V4L2_CTRL_TYPE_BUTTON ||
2012 type == V4L2_CTRL_TYPE_CTRL_CLASS)) {
2013 handler_set_err(hdl, -EINVAL);
2014 return NULL;
2015 }
2016
2017 sz_extra = 0;
2018 if (type == V4L2_CTRL_TYPE_BUTTON)
2019 flags |= V4L2_CTRL_FLAG_WRITE_ONLY |
2020 V4L2_CTRL_FLAG_EXECUTE_ON_WRITE;
2021 else if (type == V4L2_CTRL_TYPE_CTRL_CLASS)
2022 flags |= V4L2_CTRL_FLAG_READ_ONLY;
2023 else if (type == V4L2_CTRL_TYPE_INTEGER64 ||
2024 type == V4L2_CTRL_TYPE_STRING ||
2025 type >= V4L2_CTRL_COMPOUND_TYPES ||
2026 is_array)
2027 sz_extra += 2 * tot_ctrl_size;
2028
2029 ctrl = kzalloc(sizeof(*ctrl) + sz_extra, GFP_KERNEL);
2030 if (ctrl == NULL) {
2031 handler_set_err(hdl, -ENOMEM);
2032 return NULL;
2033 }
2034
2035 INIT_LIST_HEAD(&ctrl->node);
2036 INIT_LIST_HEAD(&ctrl->ev_subs);
2037 ctrl->handler = hdl;
2038 ctrl->ops = ops;
2039 ctrl->type_ops = type_ops ? type_ops : &std_type_ops;
2040 ctrl->id = id;
2041 ctrl->name = name;
2042 ctrl->type = type;
2043 ctrl->flags = flags;
2044 ctrl->minimum = min;
2045 ctrl->maximum = max;
2046 ctrl->step = step;
2047 ctrl->default_value = def;
2048 ctrl->is_string = !is_array && type == V4L2_CTRL_TYPE_STRING;
2049 ctrl->is_ptr = is_array || type >= V4L2_CTRL_COMPOUND_TYPES || ctrl->is_string;
2050 ctrl->is_int = !ctrl->is_ptr && type != V4L2_CTRL_TYPE_INTEGER64;
2051 ctrl->is_array = is_array;
2052 ctrl->elems = elems;
2053 ctrl->nr_of_dims = nr_of_dims;
2054 if (nr_of_dims)
2055 memcpy(ctrl->dims, dims, nr_of_dims * sizeof(dims[0]));
2056 ctrl->elem_size = elem_size;
2057 if (type == V4L2_CTRL_TYPE_MENU)
2058 ctrl->qmenu = qmenu;
2059 else if (type == V4L2_CTRL_TYPE_INTEGER_MENU)
2060 ctrl->qmenu_int = qmenu_int;
2061 ctrl->priv = priv;
2062 ctrl->cur.val = ctrl->val = def;
2063 data = &ctrl[1];
2064
2065 if (!ctrl->is_int) {
2066 ctrl->p_new.p = data;
2067 ctrl->p_cur.p = data + tot_ctrl_size;
2068 } else {
2069 ctrl->p_new.p = &ctrl->val;
2070 ctrl->p_cur.p = &ctrl->cur.val;
2071 }
2072 for (idx = 0; idx < elems; idx++) {
2073 ctrl->type_ops->init(ctrl, idx, ctrl->p_cur);
2074 ctrl->type_ops->init(ctrl, idx, ctrl->p_new);
2075 }
2076
2077 if (handler_new_ref(hdl, ctrl)) {
2078 kfree(ctrl);
2079 return NULL;
2080 }
2081 mutex_lock(hdl->lock);
2082 list_add_tail(&ctrl->node, &hdl->ctrls);
2083 mutex_unlock(hdl->lock);
2084 return ctrl;
2085 }
2086
v4l2_ctrl_new_custom(struct v4l2_ctrl_handler * hdl,const struct v4l2_ctrl_config * cfg,void * priv)2087 struct v4l2_ctrl *v4l2_ctrl_new_custom(struct v4l2_ctrl_handler *hdl,
2088 const struct v4l2_ctrl_config *cfg, void *priv)
2089 {
2090 bool is_menu;
2091 struct v4l2_ctrl *ctrl;
2092 const char *name = cfg->name;
2093 const char * const *qmenu = cfg->qmenu;
2094 const s64 *qmenu_int = cfg->qmenu_int;
2095 enum v4l2_ctrl_type type = cfg->type;
2096 u32 flags = cfg->flags;
2097 s64 min = cfg->min;
2098 s64 max = cfg->max;
2099 u64 step = cfg->step;
2100 s64 def = cfg->def;
2101
2102 if (name == NULL)
2103 v4l2_ctrl_fill(cfg->id, &name, &type, &min, &max, &step,
2104 &def, &flags);
2105
2106 is_menu = (cfg->type == V4L2_CTRL_TYPE_MENU ||
2107 cfg->type == V4L2_CTRL_TYPE_INTEGER_MENU);
2108 if (is_menu)
2109 WARN_ON(step);
2110 else
2111 WARN_ON(cfg->menu_skip_mask);
2112 if (cfg->type == V4L2_CTRL_TYPE_MENU && qmenu == NULL)
2113 qmenu = v4l2_ctrl_get_menu(cfg->id);
2114 else if (cfg->type == V4L2_CTRL_TYPE_INTEGER_MENU &&
2115 qmenu_int == NULL) {
2116 handler_set_err(hdl, -EINVAL);
2117 return NULL;
2118 }
2119
2120 ctrl = v4l2_ctrl_new(hdl, cfg->ops, cfg->type_ops, cfg->id, name,
2121 type, min, max,
2122 is_menu ? cfg->menu_skip_mask : step, def,
2123 cfg->dims, cfg->elem_size,
2124 flags, qmenu, qmenu_int, priv);
2125 if (ctrl)
2126 ctrl->is_private = cfg->is_private;
2127 return ctrl;
2128 }
2129 EXPORT_SYMBOL(v4l2_ctrl_new_custom);
2130
2131 /* Helper function for standard non-menu controls */
v4l2_ctrl_new_std(struct v4l2_ctrl_handler * hdl,const struct v4l2_ctrl_ops * ops,u32 id,s64 min,s64 max,u64 step,s64 def)2132 struct v4l2_ctrl *v4l2_ctrl_new_std(struct v4l2_ctrl_handler *hdl,
2133 const struct v4l2_ctrl_ops *ops,
2134 u32 id, s64 min, s64 max, u64 step, s64 def)
2135 {
2136 const char *name;
2137 enum v4l2_ctrl_type type;
2138 u32 flags;
2139
2140 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
2141 if (type == V4L2_CTRL_TYPE_MENU ||
2142 type == V4L2_CTRL_TYPE_INTEGER_MENU ||
2143 type >= V4L2_CTRL_COMPOUND_TYPES) {
2144 handler_set_err(hdl, -EINVAL);
2145 return NULL;
2146 }
2147 return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
2148 min, max, step, def, NULL, 0,
2149 flags, NULL, NULL, NULL);
2150 }
2151 EXPORT_SYMBOL(v4l2_ctrl_new_std);
2152
2153 /* Helper function for standard menu controls */
v4l2_ctrl_new_std_menu(struct v4l2_ctrl_handler * hdl,const struct v4l2_ctrl_ops * ops,u32 id,u8 _max,u64 mask,u8 _def)2154 struct v4l2_ctrl *v4l2_ctrl_new_std_menu(struct v4l2_ctrl_handler *hdl,
2155 const struct v4l2_ctrl_ops *ops,
2156 u32 id, u8 _max, u64 mask, u8 _def)
2157 {
2158 const char * const *qmenu = NULL;
2159 const s64 *qmenu_int = NULL;
2160 unsigned int qmenu_int_len = 0;
2161 const char *name;
2162 enum v4l2_ctrl_type type;
2163 s64 min;
2164 s64 max = _max;
2165 s64 def = _def;
2166 u64 step;
2167 u32 flags;
2168
2169 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
2170
2171 if (type == V4L2_CTRL_TYPE_MENU)
2172 qmenu = v4l2_ctrl_get_menu(id);
2173 else if (type == V4L2_CTRL_TYPE_INTEGER_MENU)
2174 qmenu_int = v4l2_ctrl_get_int_menu(id, &qmenu_int_len);
2175
2176 if ((!qmenu && !qmenu_int) || (qmenu_int && max > qmenu_int_len)) {
2177 handler_set_err(hdl, -EINVAL);
2178 return NULL;
2179 }
2180 return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
2181 0, max, mask, def, NULL, 0,
2182 flags, qmenu, qmenu_int, NULL);
2183 }
2184 EXPORT_SYMBOL(v4l2_ctrl_new_std_menu);
2185
2186 /* Helper function for standard menu controls with driver defined menu */
v4l2_ctrl_new_std_menu_items(struct v4l2_ctrl_handler * hdl,const struct v4l2_ctrl_ops * ops,u32 id,u8 _max,u64 mask,u8 _def,const char * const * qmenu)2187 struct v4l2_ctrl *v4l2_ctrl_new_std_menu_items(struct v4l2_ctrl_handler *hdl,
2188 const struct v4l2_ctrl_ops *ops, u32 id, u8 _max,
2189 u64 mask, u8 _def, const char * const *qmenu)
2190 {
2191 enum v4l2_ctrl_type type;
2192 const char *name;
2193 u32 flags;
2194 u64 step;
2195 s64 min;
2196 s64 max = _max;
2197 s64 def = _def;
2198
2199 /* v4l2_ctrl_new_std_menu_items() should only be called for
2200 * standard controls without a standard menu.
2201 */
2202 if (v4l2_ctrl_get_menu(id)) {
2203 handler_set_err(hdl, -EINVAL);
2204 return NULL;
2205 }
2206
2207 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
2208 if (type != V4L2_CTRL_TYPE_MENU || qmenu == NULL) {
2209 handler_set_err(hdl, -EINVAL);
2210 return NULL;
2211 }
2212 return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
2213 0, max, mask, def, NULL, 0,
2214 flags, qmenu, NULL, NULL);
2215
2216 }
2217 EXPORT_SYMBOL(v4l2_ctrl_new_std_menu_items);
2218
2219 /* Helper function for standard integer menu controls */
v4l2_ctrl_new_int_menu(struct v4l2_ctrl_handler * hdl,const struct v4l2_ctrl_ops * ops,u32 id,u8 _max,u8 _def,const s64 * qmenu_int)2220 struct v4l2_ctrl *v4l2_ctrl_new_int_menu(struct v4l2_ctrl_handler *hdl,
2221 const struct v4l2_ctrl_ops *ops,
2222 u32 id, u8 _max, u8 _def, const s64 *qmenu_int)
2223 {
2224 const char *name;
2225 enum v4l2_ctrl_type type;
2226 s64 min;
2227 u64 step;
2228 s64 max = _max;
2229 s64 def = _def;
2230 u32 flags;
2231
2232 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
2233 if (type != V4L2_CTRL_TYPE_INTEGER_MENU) {
2234 handler_set_err(hdl, -EINVAL);
2235 return NULL;
2236 }
2237 return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
2238 0, max, 0, def, NULL, 0,
2239 flags, NULL, qmenu_int, NULL);
2240 }
2241 EXPORT_SYMBOL(v4l2_ctrl_new_int_menu);
2242
2243 /* Add the controls from another handler to our own. */
v4l2_ctrl_add_handler(struct v4l2_ctrl_handler * hdl,struct v4l2_ctrl_handler * add,bool (* filter)(const struct v4l2_ctrl * ctrl))2244 int v4l2_ctrl_add_handler(struct v4l2_ctrl_handler *hdl,
2245 struct v4l2_ctrl_handler *add,
2246 bool (*filter)(const struct v4l2_ctrl *ctrl))
2247 {
2248 struct v4l2_ctrl_ref *ref;
2249 int ret = 0;
2250
2251 /* Do nothing if either handler is NULL or if they are the same */
2252 if (!hdl || !add || hdl == add)
2253 return 0;
2254 if (hdl->error)
2255 return hdl->error;
2256 mutex_lock(add->lock);
2257 list_for_each_entry(ref, &add->ctrl_refs, node) {
2258 struct v4l2_ctrl *ctrl = ref->ctrl;
2259
2260 /* Skip handler-private controls. */
2261 if (ctrl->is_private)
2262 continue;
2263 /* And control classes */
2264 if (ctrl->type == V4L2_CTRL_TYPE_CTRL_CLASS)
2265 continue;
2266 /* Filter any unwanted controls */
2267 if (filter && !filter(ctrl))
2268 continue;
2269 ret = handler_new_ref(hdl, ctrl);
2270 if (ret)
2271 break;
2272 }
2273 mutex_unlock(add->lock);
2274 return ret;
2275 }
2276 EXPORT_SYMBOL(v4l2_ctrl_add_handler);
2277
v4l2_ctrl_radio_filter(const struct v4l2_ctrl * ctrl)2278 bool v4l2_ctrl_radio_filter(const struct v4l2_ctrl *ctrl)
2279 {
2280 if (V4L2_CTRL_ID2WHICH(ctrl->id) == V4L2_CTRL_CLASS_FM_TX)
2281 return true;
2282 if (V4L2_CTRL_ID2WHICH(ctrl->id) == V4L2_CTRL_CLASS_FM_RX)
2283 return true;
2284 switch (ctrl->id) {
2285 case V4L2_CID_AUDIO_MUTE:
2286 case V4L2_CID_AUDIO_VOLUME:
2287 case V4L2_CID_AUDIO_BALANCE:
2288 case V4L2_CID_AUDIO_BASS:
2289 case V4L2_CID_AUDIO_TREBLE:
2290 case V4L2_CID_AUDIO_LOUDNESS:
2291 return true;
2292 default:
2293 break;
2294 }
2295 return false;
2296 }
2297 EXPORT_SYMBOL(v4l2_ctrl_radio_filter);
2298
2299 /* Cluster controls */
v4l2_ctrl_cluster(unsigned ncontrols,struct v4l2_ctrl ** controls)2300 void v4l2_ctrl_cluster(unsigned ncontrols, struct v4l2_ctrl **controls)
2301 {
2302 bool has_volatiles = false;
2303 int i;
2304
2305 /* The first control is the master control and it must not be NULL */
2306 if (WARN_ON(ncontrols == 0 || controls[0] == NULL))
2307 return;
2308
2309 for (i = 0; i < ncontrols; i++) {
2310 if (controls[i]) {
2311 controls[i]->cluster = controls;
2312 controls[i]->ncontrols = ncontrols;
2313 if (controls[i]->flags & V4L2_CTRL_FLAG_VOLATILE)
2314 has_volatiles = true;
2315 }
2316 }
2317 controls[0]->has_volatiles = has_volatiles;
2318 }
2319 EXPORT_SYMBOL(v4l2_ctrl_cluster);
2320
v4l2_ctrl_auto_cluster(unsigned ncontrols,struct v4l2_ctrl ** controls,u8 manual_val,bool set_volatile)2321 void v4l2_ctrl_auto_cluster(unsigned ncontrols, struct v4l2_ctrl **controls,
2322 u8 manual_val, bool set_volatile)
2323 {
2324 struct v4l2_ctrl *master = controls[0];
2325 u32 flag = 0;
2326 int i;
2327
2328 v4l2_ctrl_cluster(ncontrols, controls);
2329 WARN_ON(ncontrols <= 1);
2330 WARN_ON(manual_val < master->minimum || manual_val > master->maximum);
2331 WARN_ON(set_volatile && !has_op(master, g_volatile_ctrl));
2332 master->is_auto = true;
2333 master->has_volatiles = set_volatile;
2334 master->manual_mode_value = manual_val;
2335 master->flags |= V4L2_CTRL_FLAG_UPDATE;
2336
2337 if (!is_cur_manual(master))
2338 flag = V4L2_CTRL_FLAG_INACTIVE |
2339 (set_volatile ? V4L2_CTRL_FLAG_VOLATILE : 0);
2340
2341 for (i = 1; i < ncontrols; i++)
2342 if (controls[i])
2343 controls[i]->flags |= flag;
2344 }
2345 EXPORT_SYMBOL(v4l2_ctrl_auto_cluster);
2346
2347 /* Activate/deactivate a control. */
v4l2_ctrl_activate(struct v4l2_ctrl * ctrl,bool active)2348 void v4l2_ctrl_activate(struct v4l2_ctrl *ctrl, bool active)
2349 {
2350 /* invert since the actual flag is called 'inactive' */
2351 bool inactive = !active;
2352 bool old;
2353
2354 if (ctrl == NULL)
2355 return;
2356
2357 if (inactive)
2358 /* set V4L2_CTRL_FLAG_INACTIVE */
2359 old = test_and_set_bit(4, &ctrl->flags);
2360 else
2361 /* clear V4L2_CTRL_FLAG_INACTIVE */
2362 old = test_and_clear_bit(4, &ctrl->flags);
2363 if (old != inactive)
2364 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_FLAGS);
2365 }
2366 EXPORT_SYMBOL(v4l2_ctrl_activate);
2367
2368 /* Grab/ungrab a control.
2369 Typically used when streaming starts and you want to grab controls,
2370 preventing the user from changing them.
2371
2372 Just call this and the framework will block any attempts to change
2373 these controls. */
v4l2_ctrl_grab(struct v4l2_ctrl * ctrl,bool grabbed)2374 void v4l2_ctrl_grab(struct v4l2_ctrl *ctrl, bool grabbed)
2375 {
2376 bool old;
2377
2378 if (ctrl == NULL)
2379 return;
2380
2381 v4l2_ctrl_lock(ctrl);
2382 if (grabbed)
2383 /* set V4L2_CTRL_FLAG_GRABBED */
2384 old = test_and_set_bit(1, &ctrl->flags);
2385 else
2386 /* clear V4L2_CTRL_FLAG_GRABBED */
2387 old = test_and_clear_bit(1, &ctrl->flags);
2388 if (old != grabbed)
2389 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_FLAGS);
2390 v4l2_ctrl_unlock(ctrl);
2391 }
2392 EXPORT_SYMBOL(v4l2_ctrl_grab);
2393
2394 /* Log the control name and value */
log_ctrl(const struct v4l2_ctrl * ctrl,const char * prefix,const char * colon)2395 static void log_ctrl(const struct v4l2_ctrl *ctrl,
2396 const char *prefix, const char *colon)
2397 {
2398 if (ctrl->flags & (V4L2_CTRL_FLAG_DISABLED | V4L2_CTRL_FLAG_WRITE_ONLY))
2399 return;
2400 if (ctrl->type == V4L2_CTRL_TYPE_CTRL_CLASS)
2401 return;
2402
2403 pr_info("%s%s%s: ", prefix, colon, ctrl->name);
2404
2405 ctrl->type_ops->log(ctrl);
2406
2407 if (ctrl->flags & (V4L2_CTRL_FLAG_INACTIVE |
2408 V4L2_CTRL_FLAG_GRABBED |
2409 V4L2_CTRL_FLAG_VOLATILE)) {
2410 if (ctrl->flags & V4L2_CTRL_FLAG_INACTIVE)
2411 pr_cont(" inactive");
2412 if (ctrl->flags & V4L2_CTRL_FLAG_GRABBED)
2413 pr_cont(" grabbed");
2414 if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE)
2415 pr_cont(" volatile");
2416 }
2417 pr_cont("\n");
2418 }
2419
2420 /* Log all controls owned by the handler */
v4l2_ctrl_handler_log_status(struct v4l2_ctrl_handler * hdl,const char * prefix)2421 void v4l2_ctrl_handler_log_status(struct v4l2_ctrl_handler *hdl,
2422 const char *prefix)
2423 {
2424 struct v4l2_ctrl *ctrl;
2425 const char *colon = "";
2426 int len;
2427
2428 if (hdl == NULL)
2429 return;
2430 if (prefix == NULL)
2431 prefix = "";
2432 len = strlen(prefix);
2433 if (len && prefix[len - 1] != ' ')
2434 colon = ": ";
2435 mutex_lock(hdl->lock);
2436 list_for_each_entry(ctrl, &hdl->ctrls, node)
2437 if (!(ctrl->flags & V4L2_CTRL_FLAG_DISABLED))
2438 log_ctrl(ctrl, prefix, colon);
2439 mutex_unlock(hdl->lock);
2440 }
2441 EXPORT_SYMBOL(v4l2_ctrl_handler_log_status);
2442
v4l2_ctrl_subdev_log_status(struct v4l2_subdev * sd)2443 int v4l2_ctrl_subdev_log_status(struct v4l2_subdev *sd)
2444 {
2445 v4l2_ctrl_handler_log_status(sd->ctrl_handler, sd->name);
2446 return 0;
2447 }
2448 EXPORT_SYMBOL(v4l2_ctrl_subdev_log_status);
2449
2450 /* Call s_ctrl for all controls owned by the handler */
v4l2_ctrl_handler_setup(struct v4l2_ctrl_handler * hdl)2451 int v4l2_ctrl_handler_setup(struct v4l2_ctrl_handler *hdl)
2452 {
2453 struct v4l2_ctrl *ctrl;
2454 int ret = 0;
2455
2456 if (hdl == NULL)
2457 return 0;
2458 mutex_lock(hdl->lock);
2459 list_for_each_entry(ctrl, &hdl->ctrls, node)
2460 ctrl->done = false;
2461
2462 list_for_each_entry(ctrl, &hdl->ctrls, node) {
2463 struct v4l2_ctrl *master = ctrl->cluster[0];
2464 int i;
2465
2466 /* Skip if this control was already handled by a cluster. */
2467 /* Skip button controls and read-only controls. */
2468 if (ctrl->done || ctrl->type == V4L2_CTRL_TYPE_BUTTON ||
2469 (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY))
2470 continue;
2471
2472 for (i = 0; i < master->ncontrols; i++) {
2473 if (master->cluster[i]) {
2474 cur_to_new(master->cluster[i]);
2475 master->cluster[i]->is_new = 1;
2476 master->cluster[i]->done = true;
2477 }
2478 }
2479 ret = call_op(master, s_ctrl);
2480 if (ret)
2481 break;
2482 }
2483 mutex_unlock(hdl->lock);
2484 return ret;
2485 }
2486 EXPORT_SYMBOL(v4l2_ctrl_handler_setup);
2487
2488 /* Implement VIDIOC_QUERY_EXT_CTRL */
v4l2_query_ext_ctrl(struct v4l2_ctrl_handler * hdl,struct v4l2_query_ext_ctrl * qc)2489 int v4l2_query_ext_ctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_query_ext_ctrl *qc)
2490 {
2491 const unsigned next_flags = V4L2_CTRL_FLAG_NEXT_CTRL | V4L2_CTRL_FLAG_NEXT_COMPOUND;
2492 u32 id = qc->id & V4L2_CTRL_ID_MASK;
2493 struct v4l2_ctrl_ref *ref;
2494 struct v4l2_ctrl *ctrl;
2495
2496 if (hdl == NULL)
2497 return -EINVAL;
2498
2499 mutex_lock(hdl->lock);
2500
2501 /* Try to find it */
2502 ref = find_ref(hdl, id);
2503
2504 if ((qc->id & next_flags) && !list_empty(&hdl->ctrl_refs)) {
2505 bool is_compound;
2506 /* Match any control that is not hidden */
2507 unsigned mask = 1;
2508 bool match = false;
2509
2510 if ((qc->id & next_flags) == V4L2_CTRL_FLAG_NEXT_COMPOUND) {
2511 /* Match any hidden control */
2512 match = true;
2513 } else if ((qc->id & next_flags) == next_flags) {
2514 /* Match any control, compound or not */
2515 mask = 0;
2516 }
2517
2518 /* Find the next control with ID > qc->id */
2519
2520 /* Did we reach the end of the control list? */
2521 if (id >= node2id(hdl->ctrl_refs.prev)) {
2522 ref = NULL; /* Yes, so there is no next control */
2523 } else if (ref) {
2524 /* We found a control with the given ID, so just get
2525 the next valid one in the list. */
2526 list_for_each_entry_continue(ref, &hdl->ctrl_refs, node) {
2527 is_compound = ref->ctrl->is_array ||
2528 ref->ctrl->type >= V4L2_CTRL_COMPOUND_TYPES;
2529 if (id < ref->ctrl->id &&
2530 (is_compound & mask) == match)
2531 break;
2532 }
2533 if (&ref->node == &hdl->ctrl_refs)
2534 ref = NULL;
2535 } else {
2536 /* No control with the given ID exists, so start
2537 searching for the next largest ID. We know there
2538 is one, otherwise the first 'if' above would have
2539 been true. */
2540 list_for_each_entry(ref, &hdl->ctrl_refs, node) {
2541 is_compound = ref->ctrl->is_array ||
2542 ref->ctrl->type >= V4L2_CTRL_COMPOUND_TYPES;
2543 if (id < ref->ctrl->id &&
2544 (is_compound & mask) == match)
2545 break;
2546 }
2547 if (&ref->node == &hdl->ctrl_refs)
2548 ref = NULL;
2549 }
2550 }
2551 mutex_unlock(hdl->lock);
2552
2553 if (!ref)
2554 return -EINVAL;
2555
2556 ctrl = ref->ctrl;
2557 memset(qc, 0, sizeof(*qc));
2558 if (id >= V4L2_CID_PRIVATE_BASE)
2559 qc->id = id;
2560 else
2561 qc->id = ctrl->id;
2562 strlcpy(qc->name, ctrl->name, sizeof(qc->name));
2563 qc->flags = user_flags(ctrl);
2564 qc->type = ctrl->type;
2565 qc->elem_size = ctrl->elem_size;
2566 qc->elems = ctrl->elems;
2567 qc->nr_of_dims = ctrl->nr_of_dims;
2568 memcpy(qc->dims, ctrl->dims, qc->nr_of_dims * sizeof(qc->dims[0]));
2569 qc->minimum = ctrl->minimum;
2570 qc->maximum = ctrl->maximum;
2571 qc->default_value = ctrl->default_value;
2572 if (ctrl->type == V4L2_CTRL_TYPE_MENU
2573 || ctrl->type == V4L2_CTRL_TYPE_INTEGER_MENU)
2574 qc->step = 1;
2575 else
2576 qc->step = ctrl->step;
2577 return 0;
2578 }
2579 EXPORT_SYMBOL(v4l2_query_ext_ctrl);
2580
2581 /* Implement VIDIOC_QUERYCTRL */
v4l2_queryctrl(struct v4l2_ctrl_handler * hdl,struct v4l2_queryctrl * qc)2582 int v4l2_queryctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_queryctrl *qc)
2583 {
2584 struct v4l2_query_ext_ctrl qec = { qc->id };
2585 int rc;
2586
2587 rc = v4l2_query_ext_ctrl(hdl, &qec);
2588 if (rc)
2589 return rc;
2590
2591 qc->id = qec.id;
2592 qc->type = qec.type;
2593 qc->flags = qec.flags;
2594 strlcpy(qc->name, qec.name, sizeof(qc->name));
2595 switch (qc->type) {
2596 case V4L2_CTRL_TYPE_INTEGER:
2597 case V4L2_CTRL_TYPE_BOOLEAN:
2598 case V4L2_CTRL_TYPE_MENU:
2599 case V4L2_CTRL_TYPE_INTEGER_MENU:
2600 case V4L2_CTRL_TYPE_STRING:
2601 case V4L2_CTRL_TYPE_BITMASK:
2602 qc->minimum = qec.minimum;
2603 qc->maximum = qec.maximum;
2604 qc->step = qec.step;
2605 qc->default_value = qec.default_value;
2606 break;
2607 default:
2608 qc->minimum = 0;
2609 qc->maximum = 0;
2610 qc->step = 0;
2611 qc->default_value = 0;
2612 break;
2613 }
2614 return 0;
2615 }
2616 EXPORT_SYMBOL(v4l2_queryctrl);
2617
2618 /* Implement VIDIOC_QUERYMENU */
v4l2_querymenu(struct v4l2_ctrl_handler * hdl,struct v4l2_querymenu * qm)2619 int v4l2_querymenu(struct v4l2_ctrl_handler *hdl, struct v4l2_querymenu *qm)
2620 {
2621 struct v4l2_ctrl *ctrl;
2622 u32 i = qm->index;
2623
2624 ctrl = v4l2_ctrl_find(hdl, qm->id);
2625 if (!ctrl)
2626 return -EINVAL;
2627
2628 qm->reserved = 0;
2629 /* Sanity checks */
2630 switch (ctrl->type) {
2631 case V4L2_CTRL_TYPE_MENU:
2632 if (ctrl->qmenu == NULL)
2633 return -EINVAL;
2634 break;
2635 case V4L2_CTRL_TYPE_INTEGER_MENU:
2636 if (ctrl->qmenu_int == NULL)
2637 return -EINVAL;
2638 break;
2639 default:
2640 return -EINVAL;
2641 }
2642
2643 if (i < ctrl->minimum || i > ctrl->maximum)
2644 return -EINVAL;
2645
2646 /* Use mask to see if this menu item should be skipped */
2647 if (ctrl->menu_skip_mask & (1 << i))
2648 return -EINVAL;
2649 /* Empty menu items should also be skipped */
2650 if (ctrl->type == V4L2_CTRL_TYPE_MENU) {
2651 if (ctrl->qmenu[i] == NULL || ctrl->qmenu[i][0] == '\0')
2652 return -EINVAL;
2653 strlcpy(qm->name, ctrl->qmenu[i], sizeof(qm->name));
2654 } else {
2655 qm->value = ctrl->qmenu_int[i];
2656 }
2657 return 0;
2658 }
2659 EXPORT_SYMBOL(v4l2_querymenu);
2660
2661
2662 /* Some general notes on the atomic requirements of VIDIOC_G/TRY/S_EXT_CTRLS:
2663
2664 It is not a fully atomic operation, just best-effort only. After all, if
2665 multiple controls have to be set through multiple i2c writes (for example)
2666 then some initial writes may succeed while others fail. Thus leaving the
2667 system in an inconsistent state. The question is how much effort you are
2668 willing to spend on trying to make something atomic that really isn't.
2669
2670 From the point of view of an application the main requirement is that
2671 when you call VIDIOC_S_EXT_CTRLS and some values are invalid then an
2672 error should be returned without actually affecting any controls.
2673
2674 If all the values are correct, then it is acceptable to just give up
2675 in case of low-level errors.
2676
2677 It is important though that the application can tell when only a partial
2678 configuration was done. The way we do that is through the error_idx field
2679 of struct v4l2_ext_controls: if that is equal to the count field then no
2680 controls were affected. Otherwise all controls before that index were
2681 successful in performing their 'get' or 'set' operation, the control at
2682 the given index failed, and you don't know what happened with the controls
2683 after the failed one. Since if they were part of a control cluster they
2684 could have been successfully processed (if a cluster member was encountered
2685 at index < error_idx), they could have failed (if a cluster member was at
2686 error_idx), or they may not have been processed yet (if the first cluster
2687 member appeared after error_idx).
2688
2689 It is all fairly theoretical, though. In practice all you can do is to
2690 bail out. If error_idx == count, then it is an application bug. If
2691 error_idx < count then it is only an application bug if the error code was
2692 EBUSY. That usually means that something started streaming just when you
2693 tried to set the controls. In all other cases it is a driver/hardware
2694 problem and all you can do is to retry or bail out.
2695
2696 Note that these rules do not apply to VIDIOC_TRY_EXT_CTRLS: since that
2697 never modifies controls the error_idx is just set to whatever control
2698 has an invalid value.
2699 */
2700
2701 /* Prepare for the extended g/s/try functions.
2702 Find the controls in the control array and do some basic checks. */
prepare_ext_ctrls(struct v4l2_ctrl_handler * hdl,struct v4l2_ext_controls * cs,struct v4l2_ctrl_helper * helpers,bool get)2703 static int prepare_ext_ctrls(struct v4l2_ctrl_handler *hdl,
2704 struct v4l2_ext_controls *cs,
2705 struct v4l2_ctrl_helper *helpers,
2706 bool get)
2707 {
2708 struct v4l2_ctrl_helper *h;
2709 bool have_clusters = false;
2710 u32 i;
2711
2712 for (i = 0, h = helpers; i < cs->count; i++, h++) {
2713 struct v4l2_ext_control *c = &cs->controls[i];
2714 struct v4l2_ctrl_ref *ref;
2715 struct v4l2_ctrl *ctrl;
2716 u32 id = c->id & V4L2_CTRL_ID_MASK;
2717
2718 cs->error_idx = i;
2719
2720 if (cs->which &&
2721 cs->which != V4L2_CTRL_WHICH_DEF_VAL &&
2722 V4L2_CTRL_ID2WHICH(id) != cs->which)
2723 return -EINVAL;
2724
2725 /* Old-style private controls are not allowed for
2726 extended controls */
2727 if (id >= V4L2_CID_PRIVATE_BASE)
2728 return -EINVAL;
2729 ref = find_ref_lock(hdl, id);
2730 if (ref == NULL)
2731 return -EINVAL;
2732 ctrl = ref->ctrl;
2733 if (ctrl->flags & V4L2_CTRL_FLAG_DISABLED)
2734 return -EINVAL;
2735
2736 if (ctrl->cluster[0]->ncontrols > 1)
2737 have_clusters = true;
2738 if (ctrl->cluster[0] != ctrl)
2739 ref = find_ref_lock(hdl, ctrl->cluster[0]->id);
2740 if (ctrl->is_ptr && !ctrl->is_string) {
2741 unsigned tot_size = ctrl->elems * ctrl->elem_size;
2742
2743 if (c->size < tot_size) {
2744 if (get) {
2745 c->size = tot_size;
2746 return -ENOSPC;
2747 }
2748 return -EFAULT;
2749 }
2750 c->size = tot_size;
2751 }
2752 /* Store the ref to the master control of the cluster */
2753 h->mref = ref;
2754 h->ctrl = ctrl;
2755 /* Initially set next to 0, meaning that there is no other
2756 control in this helper array belonging to the same
2757 cluster */
2758 h->next = 0;
2759 }
2760
2761 /* We are done if there were no controls that belong to a multi-
2762 control cluster. */
2763 if (!have_clusters)
2764 return 0;
2765
2766 /* The code below figures out in O(n) time which controls in the list
2767 belong to the same cluster. */
2768
2769 /* This has to be done with the handler lock taken. */
2770 mutex_lock(hdl->lock);
2771
2772 /* First zero the helper field in the master control references */
2773 for (i = 0; i < cs->count; i++)
2774 helpers[i].mref->helper = NULL;
2775 for (i = 0, h = helpers; i < cs->count; i++, h++) {
2776 struct v4l2_ctrl_ref *mref = h->mref;
2777
2778 /* If the mref->helper is set, then it points to an earlier
2779 helper that belongs to the same cluster. */
2780 if (mref->helper) {
2781 /* Set the next field of mref->helper to the current
2782 index: this means that that earlier helper now
2783 points to the next helper in the same cluster. */
2784 mref->helper->next = i;
2785 /* mref should be set only for the first helper in the
2786 cluster, clear the others. */
2787 h->mref = NULL;
2788 }
2789 /* Point the mref helper to the current helper struct. */
2790 mref->helper = h;
2791 }
2792 mutex_unlock(hdl->lock);
2793 return 0;
2794 }
2795
2796 /* Handles the corner case where cs->count == 0. It checks whether the
2797 specified control class exists. If that class ID is 0, then it checks
2798 whether there are any controls at all. */
class_check(struct v4l2_ctrl_handler * hdl,u32 which)2799 static int class_check(struct v4l2_ctrl_handler *hdl, u32 which)
2800 {
2801 if (which == 0 || which == V4L2_CTRL_WHICH_DEF_VAL)
2802 return list_empty(&hdl->ctrl_refs) ? -EINVAL : 0;
2803 return find_ref_lock(hdl, which | 1) ? 0 : -EINVAL;
2804 }
2805
2806
2807
2808 /* Get extended controls. Allocates the helpers array if needed. */
v4l2_g_ext_ctrls(struct v4l2_ctrl_handler * hdl,struct v4l2_ext_controls * cs)2809 int v4l2_g_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *cs)
2810 {
2811 struct v4l2_ctrl_helper helper[4];
2812 struct v4l2_ctrl_helper *helpers = helper;
2813 int ret;
2814 int i, j;
2815 bool def_value;
2816
2817 def_value = (cs->which == V4L2_CTRL_WHICH_DEF_VAL);
2818
2819 cs->error_idx = cs->count;
2820 cs->which = V4L2_CTRL_ID2WHICH(cs->which);
2821
2822 if (hdl == NULL)
2823 return -EINVAL;
2824
2825 if (cs->count == 0)
2826 return class_check(hdl, cs->which);
2827
2828 if (cs->count > ARRAY_SIZE(helper)) {
2829 helpers = kmalloc_array(cs->count, sizeof(helper[0]),
2830 GFP_KERNEL);
2831 if (helpers == NULL)
2832 return -ENOMEM;
2833 }
2834
2835 ret = prepare_ext_ctrls(hdl, cs, helpers, true);
2836 cs->error_idx = cs->count;
2837
2838 for (i = 0; !ret && i < cs->count; i++)
2839 if (helpers[i].ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY)
2840 ret = -EACCES;
2841
2842 for (i = 0; !ret && i < cs->count; i++) {
2843 int (*ctrl_to_user)(struct v4l2_ext_control *c,
2844 struct v4l2_ctrl *ctrl);
2845 struct v4l2_ctrl *master;
2846
2847 ctrl_to_user = def_value ? def_to_user : cur_to_user;
2848
2849 if (helpers[i].mref == NULL)
2850 continue;
2851
2852 master = helpers[i].mref->ctrl;
2853 cs->error_idx = i;
2854
2855 v4l2_ctrl_lock(master);
2856
2857 /* g_volatile_ctrl will update the new control values */
2858 if (!def_value &&
2859 ((master->flags & V4L2_CTRL_FLAG_VOLATILE) ||
2860 (master->has_volatiles && !is_cur_manual(master)))) {
2861 for (j = 0; j < master->ncontrols; j++)
2862 cur_to_new(master->cluster[j]);
2863 ret = call_op(master, g_volatile_ctrl);
2864 ctrl_to_user = new_to_user;
2865 }
2866 /* If OK, then copy the current (for non-volatile controls)
2867 or the new (for volatile controls) control values to the
2868 caller */
2869 if (!ret) {
2870 u32 idx = i;
2871
2872 do {
2873 ret = ctrl_to_user(cs->controls + idx,
2874 helpers[idx].ctrl);
2875 idx = helpers[idx].next;
2876 } while (!ret && idx);
2877 }
2878 v4l2_ctrl_unlock(master);
2879 }
2880
2881 if (cs->count > ARRAY_SIZE(helper))
2882 kfree(helpers);
2883 return ret;
2884 }
2885 EXPORT_SYMBOL(v4l2_g_ext_ctrls);
2886
2887 /* Helper function to get a single control */
get_ctrl(struct v4l2_ctrl * ctrl,struct v4l2_ext_control * c)2888 static int get_ctrl(struct v4l2_ctrl *ctrl, struct v4l2_ext_control *c)
2889 {
2890 struct v4l2_ctrl *master = ctrl->cluster[0];
2891 int ret = 0;
2892 int i;
2893
2894 /* Compound controls are not supported. The new_to_user() and
2895 * cur_to_user() calls below would need to be modified not to access
2896 * userspace memory when called from get_ctrl().
2897 */
2898 if (!ctrl->is_int && ctrl->type != V4L2_CTRL_TYPE_INTEGER64)
2899 return -EINVAL;
2900
2901 if (ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY)
2902 return -EACCES;
2903
2904 v4l2_ctrl_lock(master);
2905 /* g_volatile_ctrl will update the current control values */
2906 if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE) {
2907 for (i = 0; i < master->ncontrols; i++)
2908 cur_to_new(master->cluster[i]);
2909 ret = call_op(master, g_volatile_ctrl);
2910 new_to_user(c, ctrl);
2911 } else {
2912 cur_to_user(c, ctrl);
2913 }
2914 v4l2_ctrl_unlock(master);
2915 return ret;
2916 }
2917
v4l2_g_ctrl(struct v4l2_ctrl_handler * hdl,struct v4l2_control * control)2918 int v4l2_g_ctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_control *control)
2919 {
2920 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, control->id);
2921 struct v4l2_ext_control c;
2922 int ret;
2923
2924 if (ctrl == NULL || !ctrl->is_int)
2925 return -EINVAL;
2926 ret = get_ctrl(ctrl, &c);
2927 control->value = c.value;
2928 return ret;
2929 }
2930 EXPORT_SYMBOL(v4l2_g_ctrl);
2931
v4l2_ctrl_g_ctrl(struct v4l2_ctrl * ctrl)2932 s32 v4l2_ctrl_g_ctrl(struct v4l2_ctrl *ctrl)
2933 {
2934 struct v4l2_ext_control c;
2935
2936 /* It's a driver bug if this happens. */
2937 WARN_ON(!ctrl->is_int);
2938 c.value = 0;
2939 get_ctrl(ctrl, &c);
2940 return c.value;
2941 }
2942 EXPORT_SYMBOL(v4l2_ctrl_g_ctrl);
2943
v4l2_ctrl_g_ctrl_int64(struct v4l2_ctrl * ctrl)2944 s64 v4l2_ctrl_g_ctrl_int64(struct v4l2_ctrl *ctrl)
2945 {
2946 struct v4l2_ext_control c;
2947
2948 /* It's a driver bug if this happens. */
2949 WARN_ON(ctrl->is_ptr || ctrl->type != V4L2_CTRL_TYPE_INTEGER64);
2950 c.value64 = 0;
2951 get_ctrl(ctrl, &c);
2952 return c.value64;
2953 }
2954 EXPORT_SYMBOL(v4l2_ctrl_g_ctrl_int64);
2955
2956
2957 /* Core function that calls try/s_ctrl and ensures that the new value is
2958 copied to the current value on a set.
2959 Must be called with ctrl->handler->lock held. */
try_or_set_cluster(struct v4l2_fh * fh,struct v4l2_ctrl * master,bool set,u32 ch_flags)2960 static int try_or_set_cluster(struct v4l2_fh *fh, struct v4l2_ctrl *master,
2961 bool set, u32 ch_flags)
2962 {
2963 bool update_flag;
2964 int ret;
2965 int i;
2966
2967 /* Go through the cluster and either validate the new value or
2968 (if no new value was set), copy the current value to the new
2969 value, ensuring a consistent view for the control ops when
2970 called. */
2971 for (i = 0; i < master->ncontrols; i++) {
2972 struct v4l2_ctrl *ctrl = master->cluster[i];
2973
2974 if (ctrl == NULL)
2975 continue;
2976
2977 if (!ctrl->is_new) {
2978 cur_to_new(ctrl);
2979 continue;
2980 }
2981 /* Check again: it may have changed since the
2982 previous check in try_or_set_ext_ctrls(). */
2983 if (set && (ctrl->flags & V4L2_CTRL_FLAG_GRABBED))
2984 return -EBUSY;
2985 }
2986
2987 ret = call_op(master, try_ctrl);
2988
2989 /* Don't set if there is no change */
2990 if (ret || !set || !cluster_changed(master))
2991 return ret;
2992 ret = call_op(master, s_ctrl);
2993 if (ret)
2994 return ret;
2995
2996 /* If OK, then make the new values permanent. */
2997 update_flag = is_cur_manual(master) != is_new_manual(master);
2998 for (i = 0; i < master->ncontrols; i++)
2999 new_to_cur(fh, master->cluster[i], ch_flags |
3000 ((update_flag && i > 0) ? V4L2_EVENT_CTRL_CH_FLAGS : 0));
3001 return 0;
3002 }
3003
3004 /* Validate controls. */
validate_ctrls(struct v4l2_ext_controls * cs,struct v4l2_ctrl_helper * helpers,bool set)3005 static int validate_ctrls(struct v4l2_ext_controls *cs,
3006 struct v4l2_ctrl_helper *helpers, bool set)
3007 {
3008 unsigned i;
3009 int ret = 0;
3010
3011 cs->error_idx = cs->count;
3012 for (i = 0; i < cs->count; i++) {
3013 struct v4l2_ctrl *ctrl = helpers[i].ctrl;
3014 union v4l2_ctrl_ptr p_new;
3015
3016 cs->error_idx = i;
3017
3018 if (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY)
3019 return -EACCES;
3020 /* This test is also done in try_set_control_cluster() which
3021 is called in atomic context, so that has the final say,
3022 but it makes sense to do an up-front check as well. Once
3023 an error occurs in try_set_control_cluster() some other
3024 controls may have been set already and we want to do a
3025 best-effort to avoid that. */
3026 if (set && (ctrl->flags & V4L2_CTRL_FLAG_GRABBED))
3027 return -EBUSY;
3028 /*
3029 * Skip validation for now if the payload needs to be copied
3030 * from userspace into kernelspace. We'll validate those later.
3031 */
3032 if (ctrl->is_ptr)
3033 continue;
3034 if (ctrl->type == V4L2_CTRL_TYPE_INTEGER64)
3035 p_new.p_s64 = &cs->controls[i].value64;
3036 else
3037 p_new.p_s32 = &cs->controls[i].value;
3038 ret = validate_new(ctrl, p_new);
3039 if (ret)
3040 return ret;
3041 }
3042 return 0;
3043 }
3044
3045 /* Obtain the current volatile values of an autocluster and mark them
3046 as new. */
update_from_auto_cluster(struct v4l2_ctrl * master)3047 static void update_from_auto_cluster(struct v4l2_ctrl *master)
3048 {
3049 int i;
3050
3051 for (i = 1; i < master->ncontrols; i++)
3052 cur_to_new(master->cluster[i]);
3053 if (!call_op(master, g_volatile_ctrl))
3054 for (i = 1; i < master->ncontrols; i++)
3055 if (master->cluster[i])
3056 master->cluster[i]->is_new = 1;
3057 }
3058
3059 /* Try or try-and-set controls */
try_set_ext_ctrls(struct v4l2_fh * fh,struct v4l2_ctrl_handler * hdl,struct v4l2_ext_controls * cs,bool set)3060 static int try_set_ext_ctrls(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
3061 struct v4l2_ext_controls *cs,
3062 bool set)
3063 {
3064 struct v4l2_ctrl_helper helper[4];
3065 struct v4l2_ctrl_helper *helpers = helper;
3066 unsigned i, j;
3067 int ret;
3068
3069 cs->error_idx = cs->count;
3070
3071 /* Default value cannot be changed */
3072 if (cs->which == V4L2_CTRL_WHICH_DEF_VAL)
3073 return -EINVAL;
3074
3075 cs->which = V4L2_CTRL_ID2WHICH(cs->which);
3076
3077 if (hdl == NULL)
3078 return -EINVAL;
3079
3080 if (cs->count == 0)
3081 return class_check(hdl, cs->which);
3082
3083 if (cs->count > ARRAY_SIZE(helper)) {
3084 helpers = kmalloc_array(cs->count, sizeof(helper[0]),
3085 GFP_KERNEL);
3086 if (!helpers)
3087 return -ENOMEM;
3088 }
3089 ret = prepare_ext_ctrls(hdl, cs, helpers, false);
3090 if (!ret)
3091 ret = validate_ctrls(cs, helpers, set);
3092 if (ret && set)
3093 cs->error_idx = cs->count;
3094 for (i = 0; !ret && i < cs->count; i++) {
3095 struct v4l2_ctrl *master;
3096 u32 idx = i;
3097
3098 if (helpers[i].mref == NULL)
3099 continue;
3100
3101 cs->error_idx = i;
3102 master = helpers[i].mref->ctrl;
3103 v4l2_ctrl_lock(master);
3104
3105 /* Reset the 'is_new' flags of the cluster */
3106 for (j = 0; j < master->ncontrols; j++)
3107 if (master->cluster[j])
3108 master->cluster[j]->is_new = 0;
3109
3110 /* For volatile autoclusters that are currently in auto mode
3111 we need to discover if it will be set to manual mode.
3112 If so, then we have to copy the current volatile values
3113 first since those will become the new manual values (which
3114 may be overwritten by explicit new values from this set
3115 of controls). */
3116 if (master->is_auto && master->has_volatiles &&
3117 !is_cur_manual(master)) {
3118 /* Pick an initial non-manual value */
3119 s32 new_auto_val = master->manual_mode_value + 1;
3120 u32 tmp_idx = idx;
3121
3122 do {
3123 /* Check if the auto control is part of the
3124 list, and remember the new value. */
3125 if (helpers[tmp_idx].ctrl == master)
3126 new_auto_val = cs->controls[tmp_idx].value;
3127 tmp_idx = helpers[tmp_idx].next;
3128 } while (tmp_idx);
3129 /* If the new value == the manual value, then copy
3130 the current volatile values. */
3131 if (new_auto_val == master->manual_mode_value)
3132 update_from_auto_cluster(master);
3133 }
3134
3135 /* Copy the new caller-supplied control values.
3136 user_to_new() sets 'is_new' to 1. */
3137 do {
3138 struct v4l2_ctrl *ctrl = helpers[idx].ctrl;
3139
3140 ret = user_to_new(cs->controls + idx, ctrl);
3141 if (!ret && ctrl->is_ptr)
3142 ret = validate_new(ctrl, ctrl->p_new);
3143 idx = helpers[idx].next;
3144 } while (!ret && idx);
3145
3146 if (!ret)
3147 ret = try_or_set_cluster(fh, master, set, 0);
3148
3149 /* Copy the new values back to userspace. */
3150 if (!ret) {
3151 idx = i;
3152 do {
3153 ret = new_to_user(cs->controls + idx,
3154 helpers[idx].ctrl);
3155 idx = helpers[idx].next;
3156 } while (!ret && idx);
3157 }
3158 v4l2_ctrl_unlock(master);
3159 }
3160
3161 if (cs->count > ARRAY_SIZE(helper))
3162 kfree(helpers);
3163 return ret;
3164 }
3165
v4l2_try_ext_ctrls(struct v4l2_ctrl_handler * hdl,struct v4l2_ext_controls * cs)3166 int v4l2_try_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *cs)
3167 {
3168 return try_set_ext_ctrls(NULL, hdl, cs, false);
3169 }
3170 EXPORT_SYMBOL(v4l2_try_ext_ctrls);
3171
v4l2_s_ext_ctrls(struct v4l2_fh * fh,struct v4l2_ctrl_handler * hdl,struct v4l2_ext_controls * cs)3172 int v4l2_s_ext_ctrls(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
3173 struct v4l2_ext_controls *cs)
3174 {
3175 return try_set_ext_ctrls(fh, hdl, cs, true);
3176 }
3177 EXPORT_SYMBOL(v4l2_s_ext_ctrls);
3178
3179 /* Helper function for VIDIOC_S_CTRL compatibility */
set_ctrl(struct v4l2_fh * fh,struct v4l2_ctrl * ctrl,u32 ch_flags)3180 static int set_ctrl(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, u32 ch_flags)
3181 {
3182 struct v4l2_ctrl *master = ctrl->cluster[0];
3183 int ret;
3184 int i;
3185
3186 /* Reset the 'is_new' flags of the cluster */
3187 for (i = 0; i < master->ncontrols; i++)
3188 if (master->cluster[i])
3189 master->cluster[i]->is_new = 0;
3190
3191 ret = validate_new(ctrl, ctrl->p_new);
3192 if (ret)
3193 return ret;
3194
3195 /* For autoclusters with volatiles that are switched from auto to
3196 manual mode we have to update the current volatile values since
3197 those will become the initial manual values after such a switch. */
3198 if (master->is_auto && master->has_volatiles && ctrl == master &&
3199 !is_cur_manual(master) && ctrl->val == master->manual_mode_value)
3200 update_from_auto_cluster(master);
3201
3202 ctrl->is_new = 1;
3203 return try_or_set_cluster(fh, master, true, ch_flags);
3204 }
3205
3206 /* Helper function for VIDIOC_S_CTRL compatibility */
set_ctrl_lock(struct v4l2_fh * fh,struct v4l2_ctrl * ctrl,struct v4l2_ext_control * c)3207 static int set_ctrl_lock(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl,
3208 struct v4l2_ext_control *c)
3209 {
3210 int ret;
3211
3212 v4l2_ctrl_lock(ctrl);
3213 user_to_new(c, ctrl);
3214 ret = set_ctrl(fh, ctrl, 0);
3215 if (!ret)
3216 cur_to_user(c, ctrl);
3217 v4l2_ctrl_unlock(ctrl);
3218 return ret;
3219 }
3220
v4l2_s_ctrl(struct v4l2_fh * fh,struct v4l2_ctrl_handler * hdl,struct v4l2_control * control)3221 int v4l2_s_ctrl(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
3222 struct v4l2_control *control)
3223 {
3224 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, control->id);
3225 struct v4l2_ext_control c = { control->id };
3226 int ret;
3227
3228 if (ctrl == NULL || !ctrl->is_int)
3229 return -EINVAL;
3230
3231 if (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY)
3232 return -EACCES;
3233
3234 c.value = control->value;
3235 ret = set_ctrl_lock(fh, ctrl, &c);
3236 control->value = c.value;
3237 return ret;
3238 }
3239 EXPORT_SYMBOL(v4l2_s_ctrl);
3240
__v4l2_ctrl_s_ctrl(struct v4l2_ctrl * ctrl,s32 val)3241 int __v4l2_ctrl_s_ctrl(struct v4l2_ctrl *ctrl, s32 val)
3242 {
3243 lockdep_assert_held(ctrl->handler->lock);
3244
3245 /* It's a driver bug if this happens. */
3246 WARN_ON(!ctrl->is_int);
3247 ctrl->val = val;
3248 return set_ctrl(NULL, ctrl, 0);
3249 }
3250 EXPORT_SYMBOL(__v4l2_ctrl_s_ctrl);
3251
__v4l2_ctrl_s_ctrl_int64(struct v4l2_ctrl * ctrl,s64 val)3252 int __v4l2_ctrl_s_ctrl_int64(struct v4l2_ctrl *ctrl, s64 val)
3253 {
3254 lockdep_assert_held(ctrl->handler->lock);
3255
3256 /* It's a driver bug if this happens. */
3257 WARN_ON(ctrl->is_ptr || ctrl->type != V4L2_CTRL_TYPE_INTEGER64);
3258 *ctrl->p_new.p_s64 = val;
3259 return set_ctrl(NULL, ctrl, 0);
3260 }
3261 EXPORT_SYMBOL(__v4l2_ctrl_s_ctrl_int64);
3262
__v4l2_ctrl_s_ctrl_string(struct v4l2_ctrl * ctrl,const char * s)3263 int __v4l2_ctrl_s_ctrl_string(struct v4l2_ctrl *ctrl, const char *s)
3264 {
3265 lockdep_assert_held(ctrl->handler->lock);
3266
3267 /* It's a driver bug if this happens. */
3268 WARN_ON(ctrl->type != V4L2_CTRL_TYPE_STRING);
3269 strlcpy(ctrl->p_new.p_char, s, ctrl->maximum + 1);
3270 return set_ctrl(NULL, ctrl, 0);
3271 }
3272 EXPORT_SYMBOL(__v4l2_ctrl_s_ctrl_string);
3273
v4l2_ctrl_notify(struct v4l2_ctrl * ctrl,v4l2_ctrl_notify_fnc notify,void * priv)3274 void v4l2_ctrl_notify(struct v4l2_ctrl *ctrl, v4l2_ctrl_notify_fnc notify, void *priv)
3275 {
3276 if (ctrl == NULL)
3277 return;
3278 if (notify == NULL) {
3279 ctrl->call_notify = 0;
3280 return;
3281 }
3282 if (WARN_ON(ctrl->handler->notify && ctrl->handler->notify != notify))
3283 return;
3284 ctrl->handler->notify = notify;
3285 ctrl->handler->notify_priv = priv;
3286 ctrl->call_notify = 1;
3287 }
3288 EXPORT_SYMBOL(v4l2_ctrl_notify);
3289
__v4l2_ctrl_modify_range(struct v4l2_ctrl * ctrl,s64 min,s64 max,u64 step,s64 def)3290 int __v4l2_ctrl_modify_range(struct v4l2_ctrl *ctrl,
3291 s64 min, s64 max, u64 step, s64 def)
3292 {
3293 bool value_changed;
3294 bool range_changed = false;
3295 int ret;
3296
3297 lockdep_assert_held(ctrl->handler->lock);
3298
3299 switch (ctrl->type) {
3300 case V4L2_CTRL_TYPE_INTEGER:
3301 case V4L2_CTRL_TYPE_INTEGER64:
3302 case V4L2_CTRL_TYPE_BOOLEAN:
3303 case V4L2_CTRL_TYPE_MENU:
3304 case V4L2_CTRL_TYPE_INTEGER_MENU:
3305 case V4L2_CTRL_TYPE_BITMASK:
3306 case V4L2_CTRL_TYPE_U8:
3307 case V4L2_CTRL_TYPE_U16:
3308 case V4L2_CTRL_TYPE_U32:
3309 if (ctrl->is_array)
3310 return -EINVAL;
3311 ret = check_range(ctrl->type, min, max, step, def);
3312 if (ret)
3313 return ret;
3314 break;
3315 default:
3316 return -EINVAL;
3317 }
3318 if ((ctrl->minimum != min) || (ctrl->maximum != max) ||
3319 (ctrl->step != step) || ctrl->default_value != def) {
3320 range_changed = true;
3321 ctrl->minimum = min;
3322 ctrl->maximum = max;
3323 ctrl->step = step;
3324 ctrl->default_value = def;
3325 }
3326 cur_to_new(ctrl);
3327 if (validate_new(ctrl, ctrl->p_new)) {
3328 if (ctrl->type == V4L2_CTRL_TYPE_INTEGER64)
3329 *ctrl->p_new.p_s64 = def;
3330 else
3331 *ctrl->p_new.p_s32 = def;
3332 }
3333
3334 if (ctrl->type == V4L2_CTRL_TYPE_INTEGER64)
3335 value_changed = *ctrl->p_new.p_s64 != *ctrl->p_cur.p_s64;
3336 else
3337 value_changed = *ctrl->p_new.p_s32 != *ctrl->p_cur.p_s32;
3338 if (value_changed)
3339 ret = set_ctrl(NULL, ctrl, V4L2_EVENT_CTRL_CH_RANGE);
3340 else if (range_changed)
3341 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_RANGE);
3342 return ret;
3343 }
3344 EXPORT_SYMBOL(__v4l2_ctrl_modify_range);
3345
v4l2_ctrl_add_event(struct v4l2_subscribed_event * sev,unsigned elems)3346 static int v4l2_ctrl_add_event(struct v4l2_subscribed_event *sev, unsigned elems)
3347 {
3348 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(sev->fh->ctrl_handler, sev->id);
3349
3350 if (ctrl == NULL)
3351 return -EINVAL;
3352
3353 v4l2_ctrl_lock(ctrl);
3354 list_add_tail(&sev->node, &ctrl->ev_subs);
3355 if (ctrl->type != V4L2_CTRL_TYPE_CTRL_CLASS &&
3356 (sev->flags & V4L2_EVENT_SUB_FL_SEND_INITIAL)) {
3357 struct v4l2_event ev;
3358 u32 changes = V4L2_EVENT_CTRL_CH_FLAGS;
3359
3360 if (!(ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY))
3361 changes |= V4L2_EVENT_CTRL_CH_VALUE;
3362 fill_event(&ev, ctrl, changes);
3363 /* Mark the queue as active, allowing this initial
3364 event to be accepted. */
3365 sev->elems = elems;
3366 v4l2_event_queue_fh(sev->fh, &ev);
3367 }
3368 v4l2_ctrl_unlock(ctrl);
3369 return 0;
3370 }
3371
v4l2_ctrl_del_event(struct v4l2_subscribed_event * sev)3372 static void v4l2_ctrl_del_event(struct v4l2_subscribed_event *sev)
3373 {
3374 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(sev->fh->ctrl_handler, sev->id);
3375
3376 v4l2_ctrl_lock(ctrl);
3377 list_del(&sev->node);
3378 v4l2_ctrl_unlock(ctrl);
3379 }
3380
v4l2_ctrl_replace(struct v4l2_event * old,const struct v4l2_event * new)3381 void v4l2_ctrl_replace(struct v4l2_event *old, const struct v4l2_event *new)
3382 {
3383 u32 old_changes = old->u.ctrl.changes;
3384
3385 old->u.ctrl = new->u.ctrl;
3386 old->u.ctrl.changes |= old_changes;
3387 }
3388 EXPORT_SYMBOL(v4l2_ctrl_replace);
3389
v4l2_ctrl_merge(const struct v4l2_event * old,struct v4l2_event * new)3390 void v4l2_ctrl_merge(const struct v4l2_event *old, struct v4l2_event *new)
3391 {
3392 new->u.ctrl.changes |= old->u.ctrl.changes;
3393 }
3394 EXPORT_SYMBOL(v4l2_ctrl_merge);
3395
3396 const struct v4l2_subscribed_event_ops v4l2_ctrl_sub_ev_ops = {
3397 .add = v4l2_ctrl_add_event,
3398 .del = v4l2_ctrl_del_event,
3399 .replace = v4l2_ctrl_replace,
3400 .merge = v4l2_ctrl_merge,
3401 };
3402 EXPORT_SYMBOL(v4l2_ctrl_sub_ev_ops);
3403
v4l2_ctrl_log_status(struct file * file,void * fh)3404 int v4l2_ctrl_log_status(struct file *file, void *fh)
3405 {
3406 struct video_device *vfd = video_devdata(file);
3407 struct v4l2_fh *vfh = file->private_data;
3408
3409 if (test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags) && vfd->v4l2_dev)
3410 v4l2_ctrl_handler_log_status(vfh->ctrl_handler,
3411 vfd->v4l2_dev->name);
3412 return 0;
3413 }
3414 EXPORT_SYMBOL(v4l2_ctrl_log_status);
3415
v4l2_ctrl_subscribe_event(struct v4l2_fh * fh,const struct v4l2_event_subscription * sub)3416 int v4l2_ctrl_subscribe_event(struct v4l2_fh *fh,
3417 const struct v4l2_event_subscription *sub)
3418 {
3419 if (sub->type == V4L2_EVENT_CTRL)
3420 return v4l2_event_subscribe(fh, sub, 0, &v4l2_ctrl_sub_ev_ops);
3421 return -EINVAL;
3422 }
3423 EXPORT_SYMBOL(v4l2_ctrl_subscribe_event);
3424
v4l2_ctrl_subdev_subscribe_event(struct v4l2_subdev * sd,struct v4l2_fh * fh,struct v4l2_event_subscription * sub)3425 int v4l2_ctrl_subdev_subscribe_event(struct v4l2_subdev *sd, struct v4l2_fh *fh,
3426 struct v4l2_event_subscription *sub)
3427 {
3428 if (!sd->ctrl_handler)
3429 return -EINVAL;
3430 return v4l2_ctrl_subscribe_event(fh, sub);
3431 }
3432 EXPORT_SYMBOL(v4l2_ctrl_subdev_subscribe_event);
3433
v4l2_ctrl_poll(struct file * file,struct poll_table_struct * wait)3434 unsigned int v4l2_ctrl_poll(struct file *file, struct poll_table_struct *wait)
3435 {
3436 struct v4l2_fh *fh = file->private_data;
3437
3438 if (v4l2_event_pending(fh))
3439 return POLLPRI;
3440 poll_wait(file, &fh->wait, wait);
3441 return 0;
3442 }
3443 EXPORT_SYMBOL(v4l2_ctrl_poll);
3444