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Merge remote-tracking branches 'asoc/topic/ux500' and 'asoc/topic/wm8962' into asoc...
[deliverable/linux.git] / drivers / media / v4l2-core / v4l2-ctrls.c
1 /*
2 V4L2 controls framework implementation.
3
4 Copyright (C) 2010 Hans Verkuil <hverkuil@xs4all.nl>
5
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
10
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 */
20
21 #include <linux/ctype.h>
22 #include <linux/slab.h>
23 #include <linux/export.h>
24 #include <media/v4l2-ioctl.h>
25 #include <media/v4l2-device.h>
26 #include <media/v4l2-ctrls.h>
27 #include <media/v4l2-event.h>
28 #include <media/v4l2-dev.h>
29
30 #define has_op(master, op) \
31 (master->ops && master->ops->op)
32 #define call_op(master, op) \
33 (has_op(master, op) ? master->ops->op(master) : 0)
34
35 /* Internal temporary helper struct, one for each v4l2_ext_control */
36 struct v4l2_ctrl_helper {
37 /* Pointer to the control reference of the master control */
38 struct v4l2_ctrl_ref *mref;
39 /* The control corresponding to the v4l2_ext_control ID field. */
40 struct v4l2_ctrl *ctrl;
41 /* v4l2_ext_control index of the next control belonging to the
42 same cluster, or 0 if there isn't any. */
43 u32 next;
44 };
45
46 /* Small helper function to determine if the autocluster is set to manual
47 mode. */
48 static bool is_cur_manual(const struct v4l2_ctrl *master)
49 {
50 return master->is_auto && master->cur.val == master->manual_mode_value;
51 }
52
53 /* Same as above, but this checks the against the new value instead of the
54 current value. */
55 static bool is_new_manual(const struct v4l2_ctrl *master)
56 {
57 return master->is_auto && master->val == master->manual_mode_value;
58 }
59
60 /* Returns NULL or a character pointer array containing the menu for
61 the given control ID. The pointer array ends with a NULL pointer.
62 An empty string signifies a menu entry that is invalid. This allows
63 drivers to disable certain options if it is not supported. */
64 const char * const *v4l2_ctrl_get_menu(u32 id)
65 {
66 static const char * const mpeg_audio_sampling_freq[] = {
67 "44.1 kHz",
68 "48 kHz",
69 "32 kHz",
70 NULL
71 };
72 static const char * const mpeg_audio_encoding[] = {
73 "MPEG-1/2 Layer I",
74 "MPEG-1/2 Layer II",
75 "MPEG-1/2 Layer III",
76 "MPEG-2/4 AAC",
77 "AC-3",
78 NULL
79 };
80 static const char * const mpeg_audio_l1_bitrate[] = {
81 "32 kbps",
82 "64 kbps",
83 "96 kbps",
84 "128 kbps",
85 "160 kbps",
86 "192 kbps",
87 "224 kbps",
88 "256 kbps",
89 "288 kbps",
90 "320 kbps",
91 "352 kbps",
92 "384 kbps",
93 "416 kbps",
94 "448 kbps",
95 NULL
96 };
97 static const char * const mpeg_audio_l2_bitrate[] = {
98 "32 kbps",
99 "48 kbps",
100 "56 kbps",
101 "64 kbps",
102 "80 kbps",
103 "96 kbps",
104 "112 kbps",
105 "128 kbps",
106 "160 kbps",
107 "192 kbps",
108 "224 kbps",
109 "256 kbps",
110 "320 kbps",
111 "384 kbps",
112 NULL
113 };
114 static const char * const mpeg_audio_l3_bitrate[] = {
115 "32 kbps",
116 "40 kbps",
117 "48 kbps",
118 "56 kbps",
119 "64 kbps",
120 "80 kbps",
121 "96 kbps",
122 "112 kbps",
123 "128 kbps",
124 "160 kbps",
125 "192 kbps",
126 "224 kbps",
127 "256 kbps",
128 "320 kbps",
129 NULL
130 };
131 static const char * const mpeg_audio_ac3_bitrate[] = {
132 "32 kbps",
133 "40 kbps",
134 "48 kbps",
135 "56 kbps",
136 "64 kbps",
137 "80 kbps",
138 "96 kbps",
139 "112 kbps",
140 "128 kbps",
141 "160 kbps",
142 "192 kbps",
143 "224 kbps",
144 "256 kbps",
145 "320 kbps",
146 "384 kbps",
147 "448 kbps",
148 "512 kbps",
149 "576 kbps",
150 "640 kbps",
151 NULL
152 };
153 static const char * const mpeg_audio_mode[] = {
154 "Stereo",
155 "Joint Stereo",
156 "Dual",
157 "Mono",
158 NULL
159 };
160 static const char * const mpeg_audio_mode_extension[] = {
161 "Bound 4",
162 "Bound 8",
163 "Bound 12",
164 "Bound 16",
165 NULL
166 };
167 static const char * const mpeg_audio_emphasis[] = {
168 "No Emphasis",
169 "50/15 us",
170 "CCITT J17",
171 NULL
172 };
173 static const char * const mpeg_audio_crc[] = {
174 "No CRC",
175 "16-bit CRC",
176 NULL
177 };
178 static const char * const mpeg_audio_dec_playback[] = {
179 "Auto",
180 "Stereo",
181 "Left",
182 "Right",
183 "Mono",
184 "Swapped Stereo",
185 NULL
186 };
187 static const char * const mpeg_video_encoding[] = {
188 "MPEG-1",
189 "MPEG-2",
190 "MPEG-4 AVC",
191 NULL
192 };
193 static const char * const mpeg_video_aspect[] = {
194 "1x1",
195 "4x3",
196 "16x9",
197 "2.21x1",
198 NULL
199 };
200 static const char * const mpeg_video_bitrate_mode[] = {
201 "Variable Bitrate",
202 "Constant Bitrate",
203 NULL
204 };
205 static const char * const mpeg_stream_type[] = {
206 "MPEG-2 Program Stream",
207 "MPEG-2 Transport Stream",
208 "MPEG-1 System Stream",
209 "MPEG-2 DVD-compatible Stream",
210 "MPEG-1 VCD-compatible Stream",
211 "MPEG-2 SVCD-compatible Stream",
212 NULL
213 };
214 static const char * const mpeg_stream_vbi_fmt[] = {
215 "No VBI",
216 "Private Packet, IVTV Format",
217 NULL
218 };
219 static const char * const camera_power_line_frequency[] = {
220 "Disabled",
221 "50 Hz",
222 "60 Hz",
223 "Auto",
224 NULL
225 };
226 static const char * const camera_exposure_auto[] = {
227 "Auto Mode",
228 "Manual Mode",
229 "Shutter Priority Mode",
230 "Aperture Priority Mode",
231 NULL
232 };
233 static const char * const camera_exposure_metering[] = {
234 "Average",
235 "Center Weighted",
236 "Spot",
237 "Matrix",
238 NULL
239 };
240 static const char * const camera_auto_focus_range[] = {
241 "Auto",
242 "Normal",
243 "Macro",
244 "Infinity",
245 NULL
246 };
247 static const char * const colorfx[] = {
248 "None",
249 "Black & White",
250 "Sepia",
251 "Negative",
252 "Emboss",
253 "Sketch",
254 "Sky Blue",
255 "Grass Green",
256 "Skin Whiten",
257 "Vivid",
258 "Aqua",
259 "Art Freeze",
260 "Silhouette",
261 "Solarization",
262 "Antique",
263 "Set Cb/Cr",
264 NULL
265 };
266 static const char * const auto_n_preset_white_balance[] = {
267 "Manual",
268 "Auto",
269 "Incandescent",
270 "Fluorescent",
271 "Fluorescent H",
272 "Horizon",
273 "Daylight",
274 "Flash",
275 "Cloudy",
276 "Shade",
277 NULL,
278 };
279 static const char * const camera_iso_sensitivity_auto[] = {
280 "Manual",
281 "Auto",
282 NULL
283 };
284 static const char * const scene_mode[] = {
285 "None",
286 "Backlight",
287 "Beach/Snow",
288 "Candle Light",
289 "Dusk/Dawn",
290 "Fall Colors",
291 "Fireworks",
292 "Landscape",
293 "Night",
294 "Party/Indoor",
295 "Portrait",
296 "Sports",
297 "Sunset",
298 "Text",
299 NULL
300 };
301 static const char * const tune_emphasis[] = {
302 "None",
303 "50 Microseconds",
304 "75 Microseconds",
305 NULL,
306 };
307 static const char * const header_mode[] = {
308 "Separate Buffer",
309 "Joined With 1st Frame",
310 NULL,
311 };
312 static const char * const multi_slice[] = {
313 "Single",
314 "Max Macroblocks",
315 "Max Bytes",
316 NULL,
317 };
318 static const char * const entropy_mode[] = {
319 "CAVLC",
320 "CABAC",
321 NULL,
322 };
323 static const char * const mpeg_h264_level[] = {
324 "1",
325 "1b",
326 "1.1",
327 "1.2",
328 "1.3",
329 "2",
330 "2.1",
331 "2.2",
332 "3",
333 "3.1",
334 "3.2",
335 "4",
336 "4.1",
337 "4.2",
338 "5",
339 "5.1",
340 NULL,
341 };
342 static const char * const h264_loop_filter[] = {
343 "Enabled",
344 "Disabled",
345 "Disabled at Slice Boundary",
346 NULL,
347 };
348 static const char * const h264_profile[] = {
349 "Baseline",
350 "Constrained Baseline",
351 "Main",
352 "Extended",
353 "High",
354 "High 10",
355 "High 422",
356 "High 444 Predictive",
357 "High 10 Intra",
358 "High 422 Intra",
359 "High 444 Intra",
360 "CAVLC 444 Intra",
361 "Scalable Baseline",
362 "Scalable High",
363 "Scalable High Intra",
364 "Multiview High",
365 NULL,
366 };
367 static const char * const vui_sar_idc[] = {
368 "Unspecified",
369 "1:1",
370 "12:11",
371 "10:11",
372 "16:11",
373 "40:33",
374 "24:11",
375 "20:11",
376 "32:11",
377 "80:33",
378 "18:11",
379 "15:11",
380 "64:33",
381 "160:99",
382 "4:3",
383 "3:2",
384 "2:1",
385 "Extended SAR",
386 NULL,
387 };
388 static const char * const h264_fp_arrangement_type[] = {
389 "Checkerboard",
390 "Column",
391 "Row",
392 "Side by Side",
393 "Top Bottom",
394 "Temporal",
395 NULL,
396 };
397 static const char * const h264_fmo_map_type[] = {
398 "Interleaved Slices",
399 "Scattered Slices",
400 "Foreground with Leftover",
401 "Box Out",
402 "Raster Scan",
403 "Wipe Scan",
404 "Explicit",
405 NULL,
406 };
407 static const char * const mpeg_mpeg4_level[] = {
408 "0",
409 "0b",
410 "1",
411 "2",
412 "3",
413 "3b",
414 "4",
415 "5",
416 NULL,
417 };
418 static const char * const mpeg4_profile[] = {
419 "Simple",
420 "Advanced Simple",
421 "Core",
422 "Simple Scalable",
423 "Advanced Coding Efficiency",
424 NULL,
425 };
426
427 static const char * const vpx_golden_frame_sel[] = {
428 "Use Previous Frame",
429 "Use Previous Specific Frame",
430 NULL,
431 };
432
433 static const char * const flash_led_mode[] = {
434 "Off",
435 "Flash",
436 "Torch",
437 NULL,
438 };
439 static const char * const flash_strobe_source[] = {
440 "Software",
441 "External",
442 NULL,
443 };
444
445 static const char * const jpeg_chroma_subsampling[] = {
446 "4:4:4",
447 "4:2:2",
448 "4:2:0",
449 "4:1:1",
450 "4:1:0",
451 "Gray",
452 NULL,
453 };
454 static const char * const dv_tx_mode[] = {
455 "DVI-D",
456 "HDMI",
457 NULL,
458 };
459 static const char * const dv_rgb_range[] = {
460 "Automatic",
461 "RGB limited range (16-235)",
462 "RGB full range (0-255)",
463 NULL,
464 };
465 static const char * const dv_it_content_type[] = {
466 "Graphics",
467 "Photo",
468 "Cinema",
469 "Game",
470 "No IT Content",
471 NULL,
472 };
473 static const char * const detect_md_mode[] = {
474 "Disabled",
475 "Global",
476 "Threshold Grid",
477 "Region Grid",
478 NULL,
479 };
480
481
482 switch (id) {
483 case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ:
484 return mpeg_audio_sampling_freq;
485 case V4L2_CID_MPEG_AUDIO_ENCODING:
486 return mpeg_audio_encoding;
487 case V4L2_CID_MPEG_AUDIO_L1_BITRATE:
488 return mpeg_audio_l1_bitrate;
489 case V4L2_CID_MPEG_AUDIO_L2_BITRATE:
490 return mpeg_audio_l2_bitrate;
491 case V4L2_CID_MPEG_AUDIO_L3_BITRATE:
492 return mpeg_audio_l3_bitrate;
493 case V4L2_CID_MPEG_AUDIO_AC3_BITRATE:
494 return mpeg_audio_ac3_bitrate;
495 case V4L2_CID_MPEG_AUDIO_MODE:
496 return mpeg_audio_mode;
497 case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION:
498 return mpeg_audio_mode_extension;
499 case V4L2_CID_MPEG_AUDIO_EMPHASIS:
500 return mpeg_audio_emphasis;
501 case V4L2_CID_MPEG_AUDIO_CRC:
502 return mpeg_audio_crc;
503 case V4L2_CID_MPEG_AUDIO_DEC_PLAYBACK:
504 case V4L2_CID_MPEG_AUDIO_DEC_MULTILINGUAL_PLAYBACK:
505 return mpeg_audio_dec_playback;
506 case V4L2_CID_MPEG_VIDEO_ENCODING:
507 return mpeg_video_encoding;
508 case V4L2_CID_MPEG_VIDEO_ASPECT:
509 return mpeg_video_aspect;
510 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
511 return mpeg_video_bitrate_mode;
512 case V4L2_CID_MPEG_STREAM_TYPE:
513 return mpeg_stream_type;
514 case V4L2_CID_MPEG_STREAM_VBI_FMT:
515 return mpeg_stream_vbi_fmt;
516 case V4L2_CID_POWER_LINE_FREQUENCY:
517 return camera_power_line_frequency;
518 case V4L2_CID_EXPOSURE_AUTO:
519 return camera_exposure_auto;
520 case V4L2_CID_EXPOSURE_METERING:
521 return camera_exposure_metering;
522 case V4L2_CID_AUTO_FOCUS_RANGE:
523 return camera_auto_focus_range;
524 case V4L2_CID_COLORFX:
525 return colorfx;
526 case V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE:
527 return auto_n_preset_white_balance;
528 case V4L2_CID_ISO_SENSITIVITY_AUTO:
529 return camera_iso_sensitivity_auto;
530 case V4L2_CID_SCENE_MODE:
531 return scene_mode;
532 case V4L2_CID_TUNE_PREEMPHASIS:
533 return tune_emphasis;
534 case V4L2_CID_TUNE_DEEMPHASIS:
535 return tune_emphasis;
536 case V4L2_CID_FLASH_LED_MODE:
537 return flash_led_mode;
538 case V4L2_CID_FLASH_STROBE_SOURCE:
539 return flash_strobe_source;
540 case V4L2_CID_MPEG_VIDEO_HEADER_MODE:
541 return header_mode;
542 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE:
543 return multi_slice;
544 case V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE:
545 return entropy_mode;
546 case V4L2_CID_MPEG_VIDEO_H264_LEVEL:
547 return mpeg_h264_level;
548 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE:
549 return h264_loop_filter;
550 case V4L2_CID_MPEG_VIDEO_H264_PROFILE:
551 return h264_profile;
552 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC:
553 return vui_sar_idc;
554 case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE:
555 return h264_fp_arrangement_type;
556 case V4L2_CID_MPEG_VIDEO_H264_FMO_MAP_TYPE:
557 return h264_fmo_map_type;
558 case V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL:
559 return mpeg_mpeg4_level;
560 case V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE:
561 return mpeg4_profile;
562 case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_SEL:
563 return vpx_golden_frame_sel;
564 case V4L2_CID_JPEG_CHROMA_SUBSAMPLING:
565 return jpeg_chroma_subsampling;
566 case V4L2_CID_DV_TX_MODE:
567 return dv_tx_mode;
568 case V4L2_CID_DV_TX_RGB_RANGE:
569 case V4L2_CID_DV_RX_RGB_RANGE:
570 return dv_rgb_range;
571 case V4L2_CID_DV_TX_IT_CONTENT_TYPE:
572 case V4L2_CID_DV_RX_IT_CONTENT_TYPE:
573 return dv_it_content_type;
574 case V4L2_CID_DETECT_MD_MODE:
575 return detect_md_mode;
576
577 default:
578 return NULL;
579 }
580 }
581 EXPORT_SYMBOL(v4l2_ctrl_get_menu);
582
583 #define __v4l2_qmenu_int_len(arr, len) ({ *(len) = ARRAY_SIZE(arr); arr; })
584 /*
585 * Returns NULL or an s64 type array containing the menu for given
586 * control ID. The total number of the menu items is returned in @len.
587 */
588 const s64 *v4l2_ctrl_get_int_menu(u32 id, u32 *len)
589 {
590 static const s64 qmenu_int_vpx_num_partitions[] = {
591 1, 2, 4, 8,
592 };
593
594 static const s64 qmenu_int_vpx_num_ref_frames[] = {
595 1, 2, 3,
596 };
597
598 switch (id) {
599 case V4L2_CID_MPEG_VIDEO_VPX_NUM_PARTITIONS:
600 return __v4l2_qmenu_int_len(qmenu_int_vpx_num_partitions, len);
601 case V4L2_CID_MPEG_VIDEO_VPX_NUM_REF_FRAMES:
602 return __v4l2_qmenu_int_len(qmenu_int_vpx_num_ref_frames, len);
603 default:
604 *len = 0;
605 return NULL;
606 }
607 }
608 EXPORT_SYMBOL(v4l2_ctrl_get_int_menu);
609
610 /* Return the control name. */
611 const char *v4l2_ctrl_get_name(u32 id)
612 {
613 switch (id) {
614 /* USER controls */
615 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
616 case V4L2_CID_USER_CLASS: return "User Controls";
617 case V4L2_CID_BRIGHTNESS: return "Brightness";
618 case V4L2_CID_CONTRAST: return "Contrast";
619 case V4L2_CID_SATURATION: return "Saturation";
620 case V4L2_CID_HUE: return "Hue";
621 case V4L2_CID_AUDIO_VOLUME: return "Volume";
622 case V4L2_CID_AUDIO_BALANCE: return "Balance";
623 case V4L2_CID_AUDIO_BASS: return "Bass";
624 case V4L2_CID_AUDIO_TREBLE: return "Treble";
625 case V4L2_CID_AUDIO_MUTE: return "Mute";
626 case V4L2_CID_AUDIO_LOUDNESS: return "Loudness";
627 case V4L2_CID_BLACK_LEVEL: return "Black Level";
628 case V4L2_CID_AUTO_WHITE_BALANCE: return "White Balance, Automatic";
629 case V4L2_CID_DO_WHITE_BALANCE: return "Do White Balance";
630 case V4L2_CID_RED_BALANCE: return "Red Balance";
631 case V4L2_CID_BLUE_BALANCE: return "Blue Balance";
632 case V4L2_CID_GAMMA: return "Gamma";
633 case V4L2_CID_EXPOSURE: return "Exposure";
634 case V4L2_CID_AUTOGAIN: return "Gain, Automatic";
635 case V4L2_CID_GAIN: return "Gain";
636 case V4L2_CID_HFLIP: return "Horizontal Flip";
637 case V4L2_CID_VFLIP: return "Vertical Flip";
638 case V4L2_CID_POWER_LINE_FREQUENCY: return "Power Line Frequency";
639 case V4L2_CID_HUE_AUTO: return "Hue, Automatic";
640 case V4L2_CID_WHITE_BALANCE_TEMPERATURE: return "White Balance Temperature";
641 case V4L2_CID_SHARPNESS: return "Sharpness";
642 case V4L2_CID_BACKLIGHT_COMPENSATION: return "Backlight Compensation";
643 case V4L2_CID_CHROMA_AGC: return "Chroma AGC";
644 case V4L2_CID_COLOR_KILLER: return "Color Killer";
645 case V4L2_CID_COLORFX: return "Color Effects";
646 case V4L2_CID_AUTOBRIGHTNESS: return "Brightness, Automatic";
647 case V4L2_CID_BAND_STOP_FILTER: return "Band-Stop Filter";
648 case V4L2_CID_ROTATE: return "Rotate";
649 case V4L2_CID_BG_COLOR: return "Background Color";
650 case V4L2_CID_CHROMA_GAIN: return "Chroma Gain";
651 case V4L2_CID_ILLUMINATORS_1: return "Illuminator 1";
652 case V4L2_CID_ILLUMINATORS_2: return "Illuminator 2";
653 case V4L2_CID_MIN_BUFFERS_FOR_CAPTURE: return "Min Number of Capture Buffers";
654 case V4L2_CID_MIN_BUFFERS_FOR_OUTPUT: return "Min Number of Output Buffers";
655 case V4L2_CID_ALPHA_COMPONENT: return "Alpha Component";
656 case V4L2_CID_COLORFX_CBCR: return "Color Effects, CbCr";
657
658 /* Codec controls */
659 /* The MPEG controls are applicable to all codec controls
660 * and the 'MPEG' part of the define is historical */
661 /* Keep the order of the 'case's the same as in videodev2.h! */
662 case V4L2_CID_MPEG_CLASS: return "Codec Controls";
663 case V4L2_CID_MPEG_STREAM_TYPE: return "Stream Type";
664 case V4L2_CID_MPEG_STREAM_PID_PMT: return "Stream PMT Program ID";
665 case V4L2_CID_MPEG_STREAM_PID_AUDIO: return "Stream Audio Program ID";
666 case V4L2_CID_MPEG_STREAM_PID_VIDEO: return "Stream Video Program ID";
667 case V4L2_CID_MPEG_STREAM_PID_PCR: return "Stream PCR Program ID";
668 case V4L2_CID_MPEG_STREAM_PES_ID_AUDIO: return "Stream PES Audio ID";
669 case V4L2_CID_MPEG_STREAM_PES_ID_VIDEO: return "Stream PES Video ID";
670 case V4L2_CID_MPEG_STREAM_VBI_FMT: return "Stream VBI Format";
671 case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ: return "Audio Sampling Frequency";
672 case V4L2_CID_MPEG_AUDIO_ENCODING: return "Audio Encoding";
673 case V4L2_CID_MPEG_AUDIO_L1_BITRATE: return "Audio Layer I Bitrate";
674 case V4L2_CID_MPEG_AUDIO_L2_BITRATE: return "Audio Layer II Bitrate";
675 case V4L2_CID_MPEG_AUDIO_L3_BITRATE: return "Audio Layer III Bitrate";
676 case V4L2_CID_MPEG_AUDIO_MODE: return "Audio Stereo Mode";
677 case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION: return "Audio Stereo Mode Extension";
678 case V4L2_CID_MPEG_AUDIO_EMPHASIS: return "Audio Emphasis";
679 case V4L2_CID_MPEG_AUDIO_CRC: return "Audio CRC";
680 case V4L2_CID_MPEG_AUDIO_MUTE: return "Audio Mute";
681 case V4L2_CID_MPEG_AUDIO_AAC_BITRATE: return "Audio AAC Bitrate";
682 case V4L2_CID_MPEG_AUDIO_AC3_BITRATE: return "Audio AC-3 Bitrate";
683 case V4L2_CID_MPEG_AUDIO_DEC_PLAYBACK: return "Audio Playback";
684 case V4L2_CID_MPEG_AUDIO_DEC_MULTILINGUAL_PLAYBACK: return "Audio Multilingual Playback";
685 case V4L2_CID_MPEG_VIDEO_ENCODING: return "Video Encoding";
686 case V4L2_CID_MPEG_VIDEO_ASPECT: return "Video Aspect";
687 case V4L2_CID_MPEG_VIDEO_B_FRAMES: return "Video B Frames";
688 case V4L2_CID_MPEG_VIDEO_GOP_SIZE: return "Video GOP Size";
689 case V4L2_CID_MPEG_VIDEO_GOP_CLOSURE: return "Video GOP Closure";
690 case V4L2_CID_MPEG_VIDEO_PULLDOWN: return "Video Pulldown";
691 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE: return "Video Bitrate Mode";
692 case V4L2_CID_MPEG_VIDEO_BITRATE: return "Video Bitrate";
693 case V4L2_CID_MPEG_VIDEO_BITRATE_PEAK: return "Video Peak Bitrate";
694 case V4L2_CID_MPEG_VIDEO_TEMPORAL_DECIMATION: return "Video Temporal Decimation";
695 case V4L2_CID_MPEG_VIDEO_MUTE: return "Video Mute";
696 case V4L2_CID_MPEG_VIDEO_MUTE_YUV: return "Video Mute YUV";
697 case V4L2_CID_MPEG_VIDEO_DECODER_SLICE_INTERFACE: return "Decoder Slice Interface";
698 case V4L2_CID_MPEG_VIDEO_DECODER_MPEG4_DEBLOCK_FILTER: return "MPEG4 Loop Filter Enable";
699 case V4L2_CID_MPEG_VIDEO_CYCLIC_INTRA_REFRESH_MB: return "Number of Intra Refresh MBs";
700 case V4L2_CID_MPEG_VIDEO_FRAME_RC_ENABLE: return "Frame Level Rate Control Enable";
701 case V4L2_CID_MPEG_VIDEO_MB_RC_ENABLE: return "H264 MB Level Rate Control";
702 case V4L2_CID_MPEG_VIDEO_HEADER_MODE: return "Sequence Header Mode";
703 case V4L2_CID_MPEG_VIDEO_MAX_REF_PIC: return "Max Number of Reference Pics";
704 case V4L2_CID_MPEG_VIDEO_H263_I_FRAME_QP: return "H263 I-Frame QP Value";
705 case V4L2_CID_MPEG_VIDEO_H263_P_FRAME_QP: return "H263 P-Frame QP Value";
706 case V4L2_CID_MPEG_VIDEO_H263_B_FRAME_QP: return "H263 B-Frame QP Value";
707 case V4L2_CID_MPEG_VIDEO_H263_MIN_QP: return "H263 Minimum QP Value";
708 case V4L2_CID_MPEG_VIDEO_H263_MAX_QP: return "H263 Maximum QP Value";
709 case V4L2_CID_MPEG_VIDEO_H264_I_FRAME_QP: return "H264 I-Frame QP Value";
710 case V4L2_CID_MPEG_VIDEO_H264_P_FRAME_QP: return "H264 P-Frame QP Value";
711 case V4L2_CID_MPEG_VIDEO_H264_B_FRAME_QP: return "H264 B-Frame QP Value";
712 case V4L2_CID_MPEG_VIDEO_H264_MAX_QP: return "H264 Maximum QP Value";
713 case V4L2_CID_MPEG_VIDEO_H264_MIN_QP: return "H264 Minimum QP Value";
714 case V4L2_CID_MPEG_VIDEO_H264_8X8_TRANSFORM: return "H264 8x8 Transform Enable";
715 case V4L2_CID_MPEG_VIDEO_H264_CPB_SIZE: return "H264 CPB Buffer Size";
716 case V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE: return "H264 Entropy Mode";
717 case V4L2_CID_MPEG_VIDEO_H264_I_PERIOD: return "H264 I-Frame Period";
718 case V4L2_CID_MPEG_VIDEO_H264_LEVEL: return "H264 Level";
719 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_ALPHA: return "H264 Loop Filter Alpha Offset";
720 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_BETA: return "H264 Loop Filter Beta Offset";
721 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE: return "H264 Loop Filter Mode";
722 case V4L2_CID_MPEG_VIDEO_H264_PROFILE: return "H264 Profile";
723 case V4L2_CID_MPEG_VIDEO_H264_VUI_EXT_SAR_HEIGHT: return "Vertical Size of SAR";
724 case V4L2_CID_MPEG_VIDEO_H264_VUI_EXT_SAR_WIDTH: return "Horizontal Size of SAR";
725 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_ENABLE: return "Aspect Ratio VUI Enable";
726 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC: return "VUI Aspect Ratio IDC";
727 case V4L2_CID_MPEG_VIDEO_H264_SEI_FRAME_PACKING: return "H264 Enable Frame Packing SEI";
728 case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_CURRENT_FRAME_0: return "H264 Set Curr. Frame as Frame0";
729 case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE: return "H264 FP Arrangement Type";
730 case V4L2_CID_MPEG_VIDEO_H264_FMO: return "H264 Flexible MB Ordering";
731 case V4L2_CID_MPEG_VIDEO_H264_FMO_MAP_TYPE: return "H264 Map Type for FMO";
732 case V4L2_CID_MPEG_VIDEO_H264_FMO_SLICE_GROUP: return "H264 FMO Number of Slice Groups";
733 case V4L2_CID_MPEG_VIDEO_H264_FMO_CHANGE_DIRECTION: return "H264 FMO Direction of Change";
734 case V4L2_CID_MPEG_VIDEO_H264_FMO_CHANGE_RATE: return "H264 FMO Size of 1st Slice Grp";
735 case V4L2_CID_MPEG_VIDEO_H264_FMO_RUN_LENGTH: return "H264 FMO No. of Consecutive MBs";
736 case V4L2_CID_MPEG_VIDEO_H264_ASO: return "H264 Arbitrary Slice Ordering";
737 case V4L2_CID_MPEG_VIDEO_H264_ASO_SLICE_ORDER: return "H264 ASO Slice Order";
738 case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING: return "Enable H264 Hierarchical Coding";
739 case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_TYPE: return "H264 Hierarchical Coding Type";
740 case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_LAYER:return "H264 Number of HC Layers";
741 case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_LAYER_QP:
742 return "H264 Set QP Value for HC Layers";
743 case V4L2_CID_MPEG_VIDEO_MPEG4_I_FRAME_QP: return "MPEG4 I-Frame QP Value";
744 case V4L2_CID_MPEG_VIDEO_MPEG4_P_FRAME_QP: return "MPEG4 P-Frame QP Value";
745 case V4L2_CID_MPEG_VIDEO_MPEG4_B_FRAME_QP: return "MPEG4 B-Frame QP Value";
746 case V4L2_CID_MPEG_VIDEO_MPEG4_MIN_QP: return "MPEG4 Minimum QP Value";
747 case V4L2_CID_MPEG_VIDEO_MPEG4_MAX_QP: return "MPEG4 Maximum QP Value";
748 case V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL: return "MPEG4 Level";
749 case V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE: return "MPEG4 Profile";
750 case V4L2_CID_MPEG_VIDEO_MPEG4_QPEL: return "Quarter Pixel Search Enable";
751 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MAX_BYTES: return "Maximum Bytes in a Slice";
752 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MAX_MB: return "Number of MBs in a Slice";
753 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE: return "Slice Partitioning Method";
754 case V4L2_CID_MPEG_VIDEO_VBV_SIZE: return "VBV Buffer Size";
755 case V4L2_CID_MPEG_VIDEO_DEC_PTS: return "Video Decoder PTS";
756 case V4L2_CID_MPEG_VIDEO_DEC_FRAME: return "Video Decoder Frame Count";
757 case V4L2_CID_MPEG_VIDEO_VBV_DELAY: return "Initial Delay for VBV Control";
758 case V4L2_CID_MPEG_VIDEO_MV_H_SEARCH_RANGE: return "Horizontal MV Search Range";
759 case V4L2_CID_MPEG_VIDEO_MV_V_SEARCH_RANGE: return "Vertical MV Search Range";
760 case V4L2_CID_MPEG_VIDEO_REPEAT_SEQ_HEADER: return "Repeat Sequence Header";
761 case V4L2_CID_MPEG_VIDEO_FORCE_KEY_FRAME: return "Force Key Frame";
762
763 /* VPX controls */
764 case V4L2_CID_MPEG_VIDEO_VPX_NUM_PARTITIONS: return "VPX Number of Partitions";
765 case V4L2_CID_MPEG_VIDEO_VPX_IMD_DISABLE_4X4: return "VPX Intra Mode Decision Disable";
766 case V4L2_CID_MPEG_VIDEO_VPX_NUM_REF_FRAMES: return "VPX No. of Refs for P Frame";
767 case V4L2_CID_MPEG_VIDEO_VPX_FILTER_LEVEL: return "VPX Loop Filter Level Range";
768 case V4L2_CID_MPEG_VIDEO_VPX_FILTER_SHARPNESS: return "VPX Deblocking Effect Control";
769 case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_REF_PERIOD: return "VPX Golden Frame Refresh Period";
770 case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_SEL: return "VPX Golden Frame Indicator";
771 case V4L2_CID_MPEG_VIDEO_VPX_MIN_QP: return "VPX Minimum QP Value";
772 case V4L2_CID_MPEG_VIDEO_VPX_MAX_QP: return "VPX Maximum QP Value";
773 case V4L2_CID_MPEG_VIDEO_VPX_I_FRAME_QP: return "VPX I-Frame QP Value";
774 case V4L2_CID_MPEG_VIDEO_VPX_P_FRAME_QP: return "VPX P-Frame QP Value";
775 case V4L2_CID_MPEG_VIDEO_VPX_PROFILE: return "VPX Profile";
776
777 /* CAMERA controls */
778 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
779 case V4L2_CID_CAMERA_CLASS: return "Camera Controls";
780 case V4L2_CID_EXPOSURE_AUTO: return "Auto Exposure";
781 case V4L2_CID_EXPOSURE_ABSOLUTE: return "Exposure Time, Absolute";
782 case V4L2_CID_EXPOSURE_AUTO_PRIORITY: return "Exposure, Dynamic Framerate";
783 case V4L2_CID_PAN_RELATIVE: return "Pan, Relative";
784 case V4L2_CID_TILT_RELATIVE: return "Tilt, Relative";
785 case V4L2_CID_PAN_RESET: return "Pan, Reset";
786 case V4L2_CID_TILT_RESET: return "Tilt, Reset";
787 case V4L2_CID_PAN_ABSOLUTE: return "Pan, Absolute";
788 case V4L2_CID_TILT_ABSOLUTE: return "Tilt, Absolute";
789 case V4L2_CID_FOCUS_ABSOLUTE: return "Focus, Absolute";
790 case V4L2_CID_FOCUS_RELATIVE: return "Focus, Relative";
791 case V4L2_CID_FOCUS_AUTO: return "Focus, Automatic Continuous";
792 case V4L2_CID_ZOOM_ABSOLUTE: return "Zoom, Absolute";
793 case V4L2_CID_ZOOM_RELATIVE: return "Zoom, Relative";
794 case V4L2_CID_ZOOM_CONTINUOUS: return "Zoom, Continuous";
795 case V4L2_CID_PRIVACY: return "Privacy";
796 case V4L2_CID_IRIS_ABSOLUTE: return "Iris, Absolute";
797 case V4L2_CID_IRIS_RELATIVE: return "Iris, Relative";
798 case V4L2_CID_AUTO_EXPOSURE_BIAS: return "Auto Exposure, Bias";
799 case V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE: return "White Balance, Auto & Preset";
800 case V4L2_CID_WIDE_DYNAMIC_RANGE: return "Wide Dynamic Range";
801 case V4L2_CID_IMAGE_STABILIZATION: return "Image Stabilization";
802 case V4L2_CID_ISO_SENSITIVITY: return "ISO Sensitivity";
803 case V4L2_CID_ISO_SENSITIVITY_AUTO: return "ISO Sensitivity, Auto";
804 case V4L2_CID_EXPOSURE_METERING: return "Exposure, Metering Mode";
805 case V4L2_CID_SCENE_MODE: return "Scene Mode";
806 case V4L2_CID_3A_LOCK: return "3A Lock";
807 case V4L2_CID_AUTO_FOCUS_START: return "Auto Focus, Start";
808 case V4L2_CID_AUTO_FOCUS_STOP: return "Auto Focus, Stop";
809 case V4L2_CID_AUTO_FOCUS_STATUS: return "Auto Focus, Status";
810 case V4L2_CID_AUTO_FOCUS_RANGE: return "Auto Focus, Range";
811 case V4L2_CID_PAN_SPEED: return "Pan, Speed";
812 case V4L2_CID_TILT_SPEED: return "Tilt, Speed";
813
814 /* FM Radio Modulator controls */
815 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
816 case V4L2_CID_FM_TX_CLASS: return "FM Radio Modulator Controls";
817 case V4L2_CID_RDS_TX_DEVIATION: return "RDS Signal Deviation";
818 case V4L2_CID_RDS_TX_PI: return "RDS Program ID";
819 case V4L2_CID_RDS_TX_PTY: return "RDS Program Type";
820 case V4L2_CID_RDS_TX_PS_NAME: return "RDS PS Name";
821 case V4L2_CID_RDS_TX_RADIO_TEXT: return "RDS Radio Text";
822 case V4L2_CID_RDS_TX_MONO_STEREO: return "RDS Stereo";
823 case V4L2_CID_RDS_TX_ARTIFICIAL_HEAD: return "RDS Artificial Head";
824 case V4L2_CID_RDS_TX_COMPRESSED: return "RDS Compressed";
825 case V4L2_CID_RDS_TX_DYNAMIC_PTY: return "RDS Dynamic PTY";
826 case V4L2_CID_RDS_TX_TRAFFIC_ANNOUNCEMENT: return "RDS Traffic Announcement";
827 case V4L2_CID_RDS_TX_TRAFFIC_PROGRAM: return "RDS Traffic Program";
828 case V4L2_CID_RDS_TX_MUSIC_SPEECH: return "RDS Music";
829 case V4L2_CID_RDS_TX_ALT_FREQS_ENABLE: return "RDS Enable Alt Frequencies";
830 case V4L2_CID_RDS_TX_ALT_FREQS: return "RDS Alternate Frequencies";
831 case V4L2_CID_AUDIO_LIMITER_ENABLED: return "Audio Limiter Feature Enabled";
832 case V4L2_CID_AUDIO_LIMITER_RELEASE_TIME: return "Audio Limiter Release Time";
833 case V4L2_CID_AUDIO_LIMITER_DEVIATION: return "Audio Limiter Deviation";
834 case V4L2_CID_AUDIO_COMPRESSION_ENABLED: return "Audio Compression Enabled";
835 case V4L2_CID_AUDIO_COMPRESSION_GAIN: return "Audio Compression Gain";
836 case V4L2_CID_AUDIO_COMPRESSION_THRESHOLD: return "Audio Compression Threshold";
837 case V4L2_CID_AUDIO_COMPRESSION_ATTACK_TIME: return "Audio Compression Attack Time";
838 case V4L2_CID_AUDIO_COMPRESSION_RELEASE_TIME: return "Audio Compression Release Time";
839 case V4L2_CID_PILOT_TONE_ENABLED: return "Pilot Tone Feature Enabled";
840 case V4L2_CID_PILOT_TONE_DEVIATION: return "Pilot Tone Deviation";
841 case V4L2_CID_PILOT_TONE_FREQUENCY: return "Pilot Tone Frequency";
842 case V4L2_CID_TUNE_PREEMPHASIS: return "Pre-Emphasis";
843 case V4L2_CID_TUNE_POWER_LEVEL: return "Tune Power Level";
844 case V4L2_CID_TUNE_ANTENNA_CAPACITOR: return "Tune Antenna Capacitor";
845
846 /* Flash controls */
847 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
848 case V4L2_CID_FLASH_CLASS: return "Flash Controls";
849 case V4L2_CID_FLASH_LED_MODE: return "LED Mode";
850 case V4L2_CID_FLASH_STROBE_SOURCE: return "Strobe Source";
851 case V4L2_CID_FLASH_STROBE: return "Strobe";
852 case V4L2_CID_FLASH_STROBE_STOP: return "Stop Strobe";
853 case V4L2_CID_FLASH_STROBE_STATUS: return "Strobe Status";
854 case V4L2_CID_FLASH_TIMEOUT: return "Strobe Timeout";
855 case V4L2_CID_FLASH_INTENSITY: return "Intensity, Flash Mode";
856 case V4L2_CID_FLASH_TORCH_INTENSITY: return "Intensity, Torch Mode";
857 case V4L2_CID_FLASH_INDICATOR_INTENSITY: return "Intensity, Indicator";
858 case V4L2_CID_FLASH_FAULT: return "Faults";
859 case V4L2_CID_FLASH_CHARGE: return "Charge";
860 case V4L2_CID_FLASH_READY: return "Ready to Strobe";
861
862 /* JPEG encoder controls */
863 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
864 case V4L2_CID_JPEG_CLASS: return "JPEG Compression Controls";
865 case V4L2_CID_JPEG_CHROMA_SUBSAMPLING: return "Chroma Subsampling";
866 case V4L2_CID_JPEG_RESTART_INTERVAL: return "Restart Interval";
867 case V4L2_CID_JPEG_COMPRESSION_QUALITY: return "Compression Quality";
868 case V4L2_CID_JPEG_ACTIVE_MARKER: return "Active Markers";
869
870 /* Image source controls */
871 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
872 case V4L2_CID_IMAGE_SOURCE_CLASS: return "Image Source Controls";
873 case V4L2_CID_VBLANK: return "Vertical Blanking";
874 case V4L2_CID_HBLANK: return "Horizontal Blanking";
875 case V4L2_CID_ANALOGUE_GAIN: return "Analogue Gain";
876 case V4L2_CID_TEST_PATTERN_RED: return "Red Pixel Value";
877 case V4L2_CID_TEST_PATTERN_GREENR: return "Green (Red) Pixel Value";
878 case V4L2_CID_TEST_PATTERN_BLUE: return "Blue Pixel Value";
879 case V4L2_CID_TEST_PATTERN_GREENB: return "Green (Blue) Pixel Value";
880
881 /* Image processing controls */
882 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
883 case V4L2_CID_IMAGE_PROC_CLASS: return "Image Processing Controls";
884 case V4L2_CID_LINK_FREQ: return "Link Frequency";
885 case V4L2_CID_PIXEL_RATE: return "Pixel Rate";
886 case V4L2_CID_TEST_PATTERN: return "Test Pattern";
887
888 /* DV controls */
889 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
890 case V4L2_CID_DV_CLASS: return "Digital Video Controls";
891 case V4L2_CID_DV_TX_HOTPLUG: return "Hotplug Present";
892 case V4L2_CID_DV_TX_RXSENSE: return "RxSense Present";
893 case V4L2_CID_DV_TX_EDID_PRESENT: return "EDID Present";
894 case V4L2_CID_DV_TX_MODE: return "Transmit Mode";
895 case V4L2_CID_DV_TX_RGB_RANGE: return "Tx RGB Quantization Range";
896 case V4L2_CID_DV_TX_IT_CONTENT_TYPE: return "Tx IT Content Type";
897 case V4L2_CID_DV_RX_POWER_PRESENT: return "Power Present";
898 case V4L2_CID_DV_RX_RGB_RANGE: return "Rx RGB Quantization Range";
899 case V4L2_CID_DV_RX_IT_CONTENT_TYPE: return "Rx IT Content Type";
900
901 case V4L2_CID_FM_RX_CLASS: return "FM Radio Receiver Controls";
902 case V4L2_CID_TUNE_DEEMPHASIS: return "De-Emphasis";
903 case V4L2_CID_RDS_RECEPTION: return "RDS Reception";
904 case V4L2_CID_RF_TUNER_CLASS: return "RF Tuner Controls";
905 case V4L2_CID_RF_TUNER_RF_GAIN: return "RF Gain";
906 case V4L2_CID_RF_TUNER_LNA_GAIN_AUTO: return "LNA Gain, Auto";
907 case V4L2_CID_RF_TUNER_LNA_GAIN: return "LNA Gain";
908 case V4L2_CID_RF_TUNER_MIXER_GAIN_AUTO: return "Mixer Gain, Auto";
909 case V4L2_CID_RF_TUNER_MIXER_GAIN: return "Mixer Gain";
910 case V4L2_CID_RF_TUNER_IF_GAIN_AUTO: return "IF Gain, Auto";
911 case V4L2_CID_RF_TUNER_IF_GAIN: return "IF Gain";
912 case V4L2_CID_RF_TUNER_BANDWIDTH_AUTO: return "Bandwidth, Auto";
913 case V4L2_CID_RF_TUNER_BANDWIDTH: return "Bandwidth";
914 case V4L2_CID_RF_TUNER_PLL_LOCK: return "PLL Lock";
915 case V4L2_CID_RDS_RX_PTY: return "RDS Program Type";
916 case V4L2_CID_RDS_RX_PS_NAME: return "RDS PS Name";
917 case V4L2_CID_RDS_RX_RADIO_TEXT: return "RDS Radio Text";
918 case V4L2_CID_RDS_RX_TRAFFIC_ANNOUNCEMENT: return "RDS Traffic Announcement";
919 case V4L2_CID_RDS_RX_TRAFFIC_PROGRAM: return "RDS Traffic Program";
920 case V4L2_CID_RDS_RX_MUSIC_SPEECH: return "RDS Music";
921
922 /* Detection controls */
923 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
924 case V4L2_CID_DETECT_CLASS: return "Detection Controls";
925 case V4L2_CID_DETECT_MD_MODE: return "Motion Detection Mode";
926 case V4L2_CID_DETECT_MD_GLOBAL_THRESHOLD: return "MD Global Threshold";
927 case V4L2_CID_DETECT_MD_THRESHOLD_GRID: return "MD Threshold Grid";
928 case V4L2_CID_DETECT_MD_REGION_GRID: return "MD Region Grid";
929 default:
930 return NULL;
931 }
932 }
933 EXPORT_SYMBOL(v4l2_ctrl_get_name);
934
935 void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type,
936 s64 *min, s64 *max, u64 *step, s64 *def, u32 *flags)
937 {
938 *name = v4l2_ctrl_get_name(id);
939 *flags = 0;
940
941 switch (id) {
942 case V4L2_CID_AUDIO_MUTE:
943 case V4L2_CID_AUDIO_LOUDNESS:
944 case V4L2_CID_AUTO_WHITE_BALANCE:
945 case V4L2_CID_AUTOGAIN:
946 case V4L2_CID_HFLIP:
947 case V4L2_CID_VFLIP:
948 case V4L2_CID_HUE_AUTO:
949 case V4L2_CID_CHROMA_AGC:
950 case V4L2_CID_COLOR_KILLER:
951 case V4L2_CID_AUTOBRIGHTNESS:
952 case V4L2_CID_MPEG_AUDIO_MUTE:
953 case V4L2_CID_MPEG_VIDEO_MUTE:
954 case V4L2_CID_MPEG_VIDEO_GOP_CLOSURE:
955 case V4L2_CID_MPEG_VIDEO_PULLDOWN:
956 case V4L2_CID_EXPOSURE_AUTO_PRIORITY:
957 case V4L2_CID_FOCUS_AUTO:
958 case V4L2_CID_PRIVACY:
959 case V4L2_CID_AUDIO_LIMITER_ENABLED:
960 case V4L2_CID_AUDIO_COMPRESSION_ENABLED:
961 case V4L2_CID_PILOT_TONE_ENABLED:
962 case V4L2_CID_ILLUMINATORS_1:
963 case V4L2_CID_ILLUMINATORS_2:
964 case V4L2_CID_FLASH_STROBE_STATUS:
965 case V4L2_CID_FLASH_CHARGE:
966 case V4L2_CID_FLASH_READY:
967 case V4L2_CID_MPEG_VIDEO_DECODER_MPEG4_DEBLOCK_FILTER:
968 case V4L2_CID_MPEG_VIDEO_DECODER_SLICE_INTERFACE:
969 case V4L2_CID_MPEG_VIDEO_FRAME_RC_ENABLE:
970 case V4L2_CID_MPEG_VIDEO_MB_RC_ENABLE:
971 case V4L2_CID_MPEG_VIDEO_H264_8X8_TRANSFORM:
972 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_ENABLE:
973 case V4L2_CID_MPEG_VIDEO_MPEG4_QPEL:
974 case V4L2_CID_MPEG_VIDEO_REPEAT_SEQ_HEADER:
975 case V4L2_CID_WIDE_DYNAMIC_RANGE:
976 case V4L2_CID_IMAGE_STABILIZATION:
977 case V4L2_CID_RDS_RECEPTION:
978 case V4L2_CID_RF_TUNER_LNA_GAIN_AUTO:
979 case V4L2_CID_RF_TUNER_MIXER_GAIN_AUTO:
980 case V4L2_CID_RF_TUNER_IF_GAIN_AUTO:
981 case V4L2_CID_RF_TUNER_BANDWIDTH_AUTO:
982 case V4L2_CID_RF_TUNER_PLL_LOCK:
983 case V4L2_CID_RDS_TX_MONO_STEREO:
984 case V4L2_CID_RDS_TX_ARTIFICIAL_HEAD:
985 case V4L2_CID_RDS_TX_COMPRESSED:
986 case V4L2_CID_RDS_TX_DYNAMIC_PTY:
987 case V4L2_CID_RDS_TX_TRAFFIC_ANNOUNCEMENT:
988 case V4L2_CID_RDS_TX_TRAFFIC_PROGRAM:
989 case V4L2_CID_RDS_TX_MUSIC_SPEECH:
990 case V4L2_CID_RDS_TX_ALT_FREQS_ENABLE:
991 case V4L2_CID_RDS_RX_TRAFFIC_ANNOUNCEMENT:
992 case V4L2_CID_RDS_RX_TRAFFIC_PROGRAM:
993 case V4L2_CID_RDS_RX_MUSIC_SPEECH:
994 *type = V4L2_CTRL_TYPE_BOOLEAN;
995 *min = 0;
996 *max = *step = 1;
997 break;
998 case V4L2_CID_MPEG_VIDEO_MV_H_SEARCH_RANGE:
999 case V4L2_CID_MPEG_VIDEO_MV_V_SEARCH_RANGE:
1000 *type = V4L2_CTRL_TYPE_INTEGER;
1001 break;
1002 case V4L2_CID_MPEG_VIDEO_FORCE_KEY_FRAME:
1003 case V4L2_CID_PAN_RESET:
1004 case V4L2_CID_TILT_RESET:
1005 case V4L2_CID_FLASH_STROBE:
1006 case V4L2_CID_FLASH_STROBE_STOP:
1007 case V4L2_CID_AUTO_FOCUS_START:
1008 case V4L2_CID_AUTO_FOCUS_STOP:
1009 *type = V4L2_CTRL_TYPE_BUTTON;
1010 *flags |= V4L2_CTRL_FLAG_WRITE_ONLY |
1011 V4L2_CTRL_FLAG_EXECUTE_ON_WRITE;
1012 *min = *max = *step = *def = 0;
1013 break;
1014 case V4L2_CID_POWER_LINE_FREQUENCY:
1015 case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ:
1016 case V4L2_CID_MPEG_AUDIO_ENCODING:
1017 case V4L2_CID_MPEG_AUDIO_L1_BITRATE:
1018 case V4L2_CID_MPEG_AUDIO_L2_BITRATE:
1019 case V4L2_CID_MPEG_AUDIO_L3_BITRATE:
1020 case V4L2_CID_MPEG_AUDIO_AC3_BITRATE:
1021 case V4L2_CID_MPEG_AUDIO_MODE:
1022 case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION:
1023 case V4L2_CID_MPEG_AUDIO_EMPHASIS:
1024 case V4L2_CID_MPEG_AUDIO_CRC:
1025 case V4L2_CID_MPEG_AUDIO_DEC_PLAYBACK:
1026 case V4L2_CID_MPEG_AUDIO_DEC_MULTILINGUAL_PLAYBACK:
1027 case V4L2_CID_MPEG_VIDEO_ENCODING:
1028 case V4L2_CID_MPEG_VIDEO_ASPECT:
1029 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
1030 case V4L2_CID_MPEG_STREAM_TYPE:
1031 case V4L2_CID_MPEG_STREAM_VBI_FMT:
1032 case V4L2_CID_EXPOSURE_AUTO:
1033 case V4L2_CID_AUTO_FOCUS_RANGE:
1034 case V4L2_CID_COLORFX:
1035 case V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE:
1036 case V4L2_CID_TUNE_PREEMPHASIS:
1037 case V4L2_CID_FLASH_LED_MODE:
1038 case V4L2_CID_FLASH_STROBE_SOURCE:
1039 case V4L2_CID_MPEG_VIDEO_HEADER_MODE:
1040 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE:
1041 case V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE:
1042 case V4L2_CID_MPEG_VIDEO_H264_LEVEL:
1043 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE:
1044 case V4L2_CID_MPEG_VIDEO_H264_PROFILE:
1045 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC:
1046 case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE:
1047 case V4L2_CID_MPEG_VIDEO_H264_FMO_MAP_TYPE:
1048 case V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL:
1049 case V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE:
1050 case V4L2_CID_JPEG_CHROMA_SUBSAMPLING:
1051 case V4L2_CID_ISO_SENSITIVITY_AUTO:
1052 case V4L2_CID_EXPOSURE_METERING:
1053 case V4L2_CID_SCENE_MODE:
1054 case V4L2_CID_DV_TX_MODE:
1055 case V4L2_CID_DV_TX_RGB_RANGE:
1056 case V4L2_CID_DV_TX_IT_CONTENT_TYPE:
1057 case V4L2_CID_DV_RX_RGB_RANGE:
1058 case V4L2_CID_DV_RX_IT_CONTENT_TYPE:
1059 case V4L2_CID_TEST_PATTERN:
1060 case V4L2_CID_TUNE_DEEMPHASIS:
1061 case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_SEL:
1062 case V4L2_CID_DETECT_MD_MODE:
1063 *type = V4L2_CTRL_TYPE_MENU;
1064 break;
1065 case V4L2_CID_LINK_FREQ:
1066 *type = V4L2_CTRL_TYPE_INTEGER_MENU;
1067 break;
1068 case V4L2_CID_RDS_TX_PS_NAME:
1069 case V4L2_CID_RDS_TX_RADIO_TEXT:
1070 case V4L2_CID_RDS_RX_PS_NAME:
1071 case V4L2_CID_RDS_RX_RADIO_TEXT:
1072 *type = V4L2_CTRL_TYPE_STRING;
1073 break;
1074 case V4L2_CID_ISO_SENSITIVITY:
1075 case V4L2_CID_AUTO_EXPOSURE_BIAS:
1076 case V4L2_CID_MPEG_VIDEO_VPX_NUM_PARTITIONS:
1077 case V4L2_CID_MPEG_VIDEO_VPX_NUM_REF_FRAMES:
1078 *type = V4L2_CTRL_TYPE_INTEGER_MENU;
1079 break;
1080 case V4L2_CID_USER_CLASS:
1081 case V4L2_CID_CAMERA_CLASS:
1082 case V4L2_CID_MPEG_CLASS:
1083 case V4L2_CID_FM_TX_CLASS:
1084 case V4L2_CID_FLASH_CLASS:
1085 case V4L2_CID_JPEG_CLASS:
1086 case V4L2_CID_IMAGE_SOURCE_CLASS:
1087 case V4L2_CID_IMAGE_PROC_CLASS:
1088 case V4L2_CID_DV_CLASS:
1089 case V4L2_CID_FM_RX_CLASS:
1090 case V4L2_CID_RF_TUNER_CLASS:
1091 case V4L2_CID_DETECT_CLASS:
1092 *type = V4L2_CTRL_TYPE_CTRL_CLASS;
1093 /* You can neither read not write these */
1094 *flags |= V4L2_CTRL_FLAG_READ_ONLY | V4L2_CTRL_FLAG_WRITE_ONLY;
1095 *min = *max = *step = *def = 0;
1096 break;
1097 case V4L2_CID_BG_COLOR:
1098 *type = V4L2_CTRL_TYPE_INTEGER;
1099 *step = 1;
1100 *min = 0;
1101 /* Max is calculated as RGB888 that is 2^24 */
1102 *max = 0xFFFFFF;
1103 break;
1104 case V4L2_CID_FLASH_FAULT:
1105 case V4L2_CID_JPEG_ACTIVE_MARKER:
1106 case V4L2_CID_3A_LOCK:
1107 case V4L2_CID_AUTO_FOCUS_STATUS:
1108 case V4L2_CID_DV_TX_HOTPLUG:
1109 case V4L2_CID_DV_TX_RXSENSE:
1110 case V4L2_CID_DV_TX_EDID_PRESENT:
1111 case V4L2_CID_DV_RX_POWER_PRESENT:
1112 *type = V4L2_CTRL_TYPE_BITMASK;
1113 break;
1114 case V4L2_CID_MIN_BUFFERS_FOR_CAPTURE:
1115 case V4L2_CID_MIN_BUFFERS_FOR_OUTPUT:
1116 *type = V4L2_CTRL_TYPE_INTEGER;
1117 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
1118 break;
1119 case V4L2_CID_MPEG_VIDEO_DEC_PTS:
1120 *type = V4L2_CTRL_TYPE_INTEGER64;
1121 *flags |= V4L2_CTRL_FLAG_VOLATILE | V4L2_CTRL_FLAG_READ_ONLY;
1122 *min = *def = 0;
1123 *max = 0x1ffffffffLL;
1124 *step = 1;
1125 break;
1126 case V4L2_CID_MPEG_VIDEO_DEC_FRAME:
1127 *type = V4L2_CTRL_TYPE_INTEGER64;
1128 *flags |= V4L2_CTRL_FLAG_VOLATILE | V4L2_CTRL_FLAG_READ_ONLY;
1129 *min = *def = 0;
1130 *max = 0x7fffffffffffffffLL;
1131 *step = 1;
1132 break;
1133 case V4L2_CID_PIXEL_RATE:
1134 *type = V4L2_CTRL_TYPE_INTEGER64;
1135 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
1136 break;
1137 case V4L2_CID_DETECT_MD_REGION_GRID:
1138 *type = V4L2_CTRL_TYPE_U8;
1139 break;
1140 case V4L2_CID_DETECT_MD_THRESHOLD_GRID:
1141 *type = V4L2_CTRL_TYPE_U16;
1142 break;
1143 case V4L2_CID_RDS_TX_ALT_FREQS:
1144 *type = V4L2_CTRL_TYPE_U32;
1145 break;
1146 default:
1147 *type = V4L2_CTRL_TYPE_INTEGER;
1148 break;
1149 }
1150 switch (id) {
1151 case V4L2_CID_MPEG_AUDIO_ENCODING:
1152 case V4L2_CID_MPEG_AUDIO_MODE:
1153 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
1154 case V4L2_CID_MPEG_VIDEO_B_FRAMES:
1155 case V4L2_CID_MPEG_STREAM_TYPE:
1156 *flags |= V4L2_CTRL_FLAG_UPDATE;
1157 break;
1158 case V4L2_CID_AUDIO_VOLUME:
1159 case V4L2_CID_AUDIO_BALANCE:
1160 case V4L2_CID_AUDIO_BASS:
1161 case V4L2_CID_AUDIO_TREBLE:
1162 case V4L2_CID_BRIGHTNESS:
1163 case V4L2_CID_CONTRAST:
1164 case V4L2_CID_SATURATION:
1165 case V4L2_CID_HUE:
1166 case V4L2_CID_RED_BALANCE:
1167 case V4L2_CID_BLUE_BALANCE:
1168 case V4L2_CID_GAMMA:
1169 case V4L2_CID_SHARPNESS:
1170 case V4L2_CID_CHROMA_GAIN:
1171 case V4L2_CID_RDS_TX_DEVIATION:
1172 case V4L2_CID_AUDIO_LIMITER_RELEASE_TIME:
1173 case V4L2_CID_AUDIO_LIMITER_DEVIATION:
1174 case V4L2_CID_AUDIO_COMPRESSION_GAIN:
1175 case V4L2_CID_AUDIO_COMPRESSION_THRESHOLD:
1176 case V4L2_CID_AUDIO_COMPRESSION_ATTACK_TIME:
1177 case V4L2_CID_AUDIO_COMPRESSION_RELEASE_TIME:
1178 case V4L2_CID_PILOT_TONE_DEVIATION:
1179 case V4L2_CID_PILOT_TONE_FREQUENCY:
1180 case V4L2_CID_TUNE_POWER_LEVEL:
1181 case V4L2_CID_TUNE_ANTENNA_CAPACITOR:
1182 case V4L2_CID_RF_TUNER_RF_GAIN:
1183 case V4L2_CID_RF_TUNER_LNA_GAIN:
1184 case V4L2_CID_RF_TUNER_MIXER_GAIN:
1185 case V4L2_CID_RF_TUNER_IF_GAIN:
1186 case V4L2_CID_RF_TUNER_BANDWIDTH:
1187 case V4L2_CID_DETECT_MD_GLOBAL_THRESHOLD:
1188 *flags |= V4L2_CTRL_FLAG_SLIDER;
1189 break;
1190 case V4L2_CID_PAN_RELATIVE:
1191 case V4L2_CID_TILT_RELATIVE:
1192 case V4L2_CID_FOCUS_RELATIVE:
1193 case V4L2_CID_IRIS_RELATIVE:
1194 case V4L2_CID_ZOOM_RELATIVE:
1195 *flags |= V4L2_CTRL_FLAG_WRITE_ONLY |
1196 V4L2_CTRL_FLAG_EXECUTE_ON_WRITE;
1197 break;
1198 case V4L2_CID_FLASH_STROBE_STATUS:
1199 case V4L2_CID_AUTO_FOCUS_STATUS:
1200 case V4L2_CID_FLASH_READY:
1201 case V4L2_CID_DV_TX_HOTPLUG:
1202 case V4L2_CID_DV_TX_RXSENSE:
1203 case V4L2_CID_DV_TX_EDID_PRESENT:
1204 case V4L2_CID_DV_RX_POWER_PRESENT:
1205 case V4L2_CID_DV_RX_IT_CONTENT_TYPE:
1206 case V4L2_CID_RDS_RX_PTY:
1207 case V4L2_CID_RDS_RX_PS_NAME:
1208 case V4L2_CID_RDS_RX_RADIO_TEXT:
1209 case V4L2_CID_RDS_RX_TRAFFIC_ANNOUNCEMENT:
1210 case V4L2_CID_RDS_RX_TRAFFIC_PROGRAM:
1211 case V4L2_CID_RDS_RX_MUSIC_SPEECH:
1212 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
1213 break;
1214 case V4L2_CID_RF_TUNER_PLL_LOCK:
1215 *flags |= V4L2_CTRL_FLAG_VOLATILE;
1216 break;
1217 }
1218 }
1219 EXPORT_SYMBOL(v4l2_ctrl_fill);
1220
1221 static void fill_event(struct v4l2_event *ev, struct v4l2_ctrl *ctrl, u32 changes)
1222 {
1223 memset(ev->reserved, 0, sizeof(ev->reserved));
1224 ev->type = V4L2_EVENT_CTRL;
1225 ev->id = ctrl->id;
1226 ev->u.ctrl.changes = changes;
1227 ev->u.ctrl.type = ctrl->type;
1228 ev->u.ctrl.flags = ctrl->flags;
1229 if (ctrl->is_ptr)
1230 ev->u.ctrl.value64 = 0;
1231 else
1232 ev->u.ctrl.value64 = *ctrl->p_cur.p_s64;
1233 ev->u.ctrl.minimum = ctrl->minimum;
1234 ev->u.ctrl.maximum = ctrl->maximum;
1235 if (ctrl->type == V4L2_CTRL_TYPE_MENU
1236 || ctrl->type == V4L2_CTRL_TYPE_INTEGER_MENU)
1237 ev->u.ctrl.step = 1;
1238 else
1239 ev->u.ctrl.step = ctrl->step;
1240 ev->u.ctrl.default_value = ctrl->default_value;
1241 }
1242
1243 static void send_event(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, u32 changes)
1244 {
1245 struct v4l2_event ev;
1246 struct v4l2_subscribed_event *sev;
1247
1248 if (list_empty(&ctrl->ev_subs))
1249 return;
1250 fill_event(&ev, ctrl, changes);
1251
1252 list_for_each_entry(sev, &ctrl->ev_subs, node)
1253 if (sev->fh != fh ||
1254 (sev->flags & V4L2_EVENT_SUB_FL_ALLOW_FEEDBACK))
1255 v4l2_event_queue_fh(sev->fh, &ev);
1256 }
1257
1258 static bool std_equal(const struct v4l2_ctrl *ctrl, u32 idx,
1259 union v4l2_ctrl_ptr ptr1,
1260 union v4l2_ctrl_ptr ptr2)
1261 {
1262 switch (ctrl->type) {
1263 case V4L2_CTRL_TYPE_BUTTON:
1264 return false;
1265 case V4L2_CTRL_TYPE_STRING:
1266 idx *= ctrl->elem_size;
1267 /* strings are always 0-terminated */
1268 return !strcmp(ptr1.p_char + idx, ptr2.p_char + idx);
1269 case V4L2_CTRL_TYPE_INTEGER64:
1270 return ptr1.p_s64[idx] == ptr2.p_s64[idx];
1271 case V4L2_CTRL_TYPE_U8:
1272 return ptr1.p_u8[idx] == ptr2.p_u8[idx];
1273 case V4L2_CTRL_TYPE_U16:
1274 return ptr1.p_u16[idx] == ptr2.p_u16[idx];
1275 case V4L2_CTRL_TYPE_U32:
1276 return ptr1.p_u32[idx] == ptr2.p_u32[idx];
1277 default:
1278 if (ctrl->is_int)
1279 return ptr1.p_s32[idx] == ptr2.p_s32[idx];
1280 idx *= ctrl->elem_size;
1281 return !memcmp(ptr1.p + idx, ptr2.p + idx, ctrl->elem_size);
1282 }
1283 }
1284
1285 static void std_init(const struct v4l2_ctrl *ctrl, u32 idx,
1286 union v4l2_ctrl_ptr ptr)
1287 {
1288 switch (ctrl->type) {
1289 case V4L2_CTRL_TYPE_STRING:
1290 idx *= ctrl->elem_size;
1291 memset(ptr.p_char + idx, ' ', ctrl->minimum);
1292 ptr.p_char[idx + ctrl->minimum] = '\0';
1293 break;
1294 case V4L2_CTRL_TYPE_INTEGER64:
1295 ptr.p_s64[idx] = ctrl->default_value;
1296 break;
1297 case V4L2_CTRL_TYPE_INTEGER:
1298 case V4L2_CTRL_TYPE_INTEGER_MENU:
1299 case V4L2_CTRL_TYPE_MENU:
1300 case V4L2_CTRL_TYPE_BITMASK:
1301 case V4L2_CTRL_TYPE_BOOLEAN:
1302 ptr.p_s32[idx] = ctrl->default_value;
1303 break;
1304 case V4L2_CTRL_TYPE_U8:
1305 ptr.p_u8[idx] = ctrl->default_value;
1306 break;
1307 case V4L2_CTRL_TYPE_U16:
1308 ptr.p_u16[idx] = ctrl->default_value;
1309 break;
1310 case V4L2_CTRL_TYPE_U32:
1311 ptr.p_u32[idx] = ctrl->default_value;
1312 break;
1313 default:
1314 idx *= ctrl->elem_size;
1315 memset(ptr.p + idx, 0, ctrl->elem_size);
1316 break;
1317 }
1318 }
1319
1320 static void std_log(const struct v4l2_ctrl *ctrl)
1321 {
1322 union v4l2_ctrl_ptr ptr = ctrl->p_cur;
1323
1324 if (ctrl->is_array) {
1325 unsigned i;
1326
1327 for (i = 0; i < ctrl->nr_of_dims; i++)
1328 pr_cont("[%u]", ctrl->dims[i]);
1329 pr_cont(" ");
1330 }
1331
1332 switch (ctrl->type) {
1333 case V4L2_CTRL_TYPE_INTEGER:
1334 pr_cont("%d", *ptr.p_s32);
1335 break;
1336 case V4L2_CTRL_TYPE_BOOLEAN:
1337 pr_cont("%s", *ptr.p_s32 ? "true" : "false");
1338 break;
1339 case V4L2_CTRL_TYPE_MENU:
1340 pr_cont("%s", ctrl->qmenu[*ptr.p_s32]);
1341 break;
1342 case V4L2_CTRL_TYPE_INTEGER_MENU:
1343 pr_cont("%lld", ctrl->qmenu_int[*ptr.p_s32]);
1344 break;
1345 case V4L2_CTRL_TYPE_BITMASK:
1346 pr_cont("0x%08x", *ptr.p_s32);
1347 break;
1348 case V4L2_CTRL_TYPE_INTEGER64:
1349 pr_cont("%lld", *ptr.p_s64);
1350 break;
1351 case V4L2_CTRL_TYPE_STRING:
1352 pr_cont("%s", ptr.p_char);
1353 break;
1354 case V4L2_CTRL_TYPE_U8:
1355 pr_cont("%u", (unsigned)*ptr.p_u8);
1356 break;
1357 case V4L2_CTRL_TYPE_U16:
1358 pr_cont("%u", (unsigned)*ptr.p_u16);
1359 break;
1360 case V4L2_CTRL_TYPE_U32:
1361 pr_cont("%u", (unsigned)*ptr.p_u32);
1362 break;
1363 default:
1364 pr_cont("unknown type %d", ctrl->type);
1365 break;
1366 }
1367 }
1368
1369 /*
1370 * Round towards the closest legal value. Be careful when we are
1371 * close to the maximum range of the control type to prevent
1372 * wrap-arounds.
1373 */
1374 #define ROUND_TO_RANGE(val, offset_type, ctrl) \
1375 ({ \
1376 offset_type offset; \
1377 if ((ctrl)->maximum >= 0 && \
1378 val >= (ctrl)->maximum - (s32)((ctrl)->step / 2)) \
1379 val = (ctrl)->maximum; \
1380 else \
1381 val += (s32)((ctrl)->step / 2); \
1382 val = clamp_t(typeof(val), val, \
1383 (ctrl)->minimum, (ctrl)->maximum); \
1384 offset = (val) - (ctrl)->minimum; \
1385 offset = (ctrl)->step * (offset / (u32)(ctrl)->step); \
1386 val = (ctrl)->minimum + offset; \
1387 0; \
1388 })
1389
1390 /* Validate a new control */
1391 static int std_validate(const struct v4l2_ctrl *ctrl, u32 idx,
1392 union v4l2_ctrl_ptr ptr)
1393 {
1394 size_t len;
1395 u64 offset;
1396 s64 val;
1397
1398 switch (ctrl->type) {
1399 case V4L2_CTRL_TYPE_INTEGER:
1400 return ROUND_TO_RANGE(ptr.p_s32[idx], u32, ctrl);
1401 case V4L2_CTRL_TYPE_INTEGER64:
1402 /*
1403 * We can't use the ROUND_TO_RANGE define here due to
1404 * the u64 divide that needs special care.
1405 */
1406 val = ptr.p_s64[idx];
1407 if (ctrl->maximum >= 0 && val >= ctrl->maximum - (s64)(ctrl->step / 2))
1408 val = ctrl->maximum;
1409 else
1410 val += (s64)(ctrl->step / 2);
1411 val = clamp_t(s64, val, ctrl->minimum, ctrl->maximum);
1412 offset = val - ctrl->minimum;
1413 do_div(offset, ctrl->step);
1414 ptr.p_s64[idx] = ctrl->minimum + offset * ctrl->step;
1415 return 0;
1416 case V4L2_CTRL_TYPE_U8:
1417 return ROUND_TO_RANGE(ptr.p_u8[idx], u8, ctrl);
1418 case V4L2_CTRL_TYPE_U16:
1419 return ROUND_TO_RANGE(ptr.p_u16[idx], u16, ctrl);
1420 case V4L2_CTRL_TYPE_U32:
1421 return ROUND_TO_RANGE(ptr.p_u32[idx], u32, ctrl);
1422
1423 case V4L2_CTRL_TYPE_BOOLEAN:
1424 ptr.p_s32[idx] = !!ptr.p_s32[idx];
1425 return 0;
1426
1427 case V4L2_CTRL_TYPE_MENU:
1428 case V4L2_CTRL_TYPE_INTEGER_MENU:
1429 if (ptr.p_s32[idx] < ctrl->minimum || ptr.p_s32[idx] > ctrl->maximum)
1430 return -ERANGE;
1431 if (ctrl->menu_skip_mask & (1 << ptr.p_s32[idx]))
1432 return -EINVAL;
1433 if (ctrl->type == V4L2_CTRL_TYPE_MENU &&
1434 ctrl->qmenu[ptr.p_s32[idx]][0] == '\0')
1435 return -EINVAL;
1436 return 0;
1437
1438 case V4L2_CTRL_TYPE_BITMASK:
1439 ptr.p_s32[idx] &= ctrl->maximum;
1440 return 0;
1441
1442 case V4L2_CTRL_TYPE_BUTTON:
1443 case V4L2_CTRL_TYPE_CTRL_CLASS:
1444 ptr.p_s32[idx] = 0;
1445 return 0;
1446
1447 case V4L2_CTRL_TYPE_STRING:
1448 idx *= ctrl->elem_size;
1449 len = strlen(ptr.p_char + idx);
1450 if (len < ctrl->minimum)
1451 return -ERANGE;
1452 if ((len - (u32)ctrl->minimum) % (u32)ctrl->step)
1453 return -ERANGE;
1454 return 0;
1455
1456 default:
1457 return -EINVAL;
1458 }
1459 }
1460
1461 static const struct v4l2_ctrl_type_ops std_type_ops = {
1462 .equal = std_equal,
1463 .init = std_init,
1464 .log = std_log,
1465 .validate = std_validate,
1466 };
1467
1468 /* Helper function: copy the given control value back to the caller */
1469 static int ptr_to_user(struct v4l2_ext_control *c,
1470 struct v4l2_ctrl *ctrl,
1471 union v4l2_ctrl_ptr ptr)
1472 {
1473 u32 len;
1474
1475 if (ctrl->is_ptr && !ctrl->is_string)
1476 return copy_to_user(c->ptr, ptr.p, c->size) ?
1477 -EFAULT : 0;
1478
1479 switch (ctrl->type) {
1480 case V4L2_CTRL_TYPE_STRING:
1481 len = strlen(ptr.p_char);
1482 if (c->size < len + 1) {
1483 c->size = ctrl->elem_size;
1484 return -ENOSPC;
1485 }
1486 return copy_to_user(c->string, ptr.p_char, len + 1) ?
1487 -EFAULT : 0;
1488 case V4L2_CTRL_TYPE_INTEGER64:
1489 c->value64 = *ptr.p_s64;
1490 break;
1491 default:
1492 c->value = *ptr.p_s32;
1493 break;
1494 }
1495 return 0;
1496 }
1497
1498 /* Helper function: copy the current control value back to the caller */
1499 static int cur_to_user(struct v4l2_ext_control *c,
1500 struct v4l2_ctrl *ctrl)
1501 {
1502 return ptr_to_user(c, ctrl, ctrl->p_cur);
1503 }
1504
1505 /* Helper function: copy the new control value back to the caller */
1506 static int new_to_user(struct v4l2_ext_control *c,
1507 struct v4l2_ctrl *ctrl)
1508 {
1509 return ptr_to_user(c, ctrl, ctrl->p_new);
1510 }
1511
1512 /* Helper function: copy the initial control value back to the caller */
1513 static int def_to_user(struct v4l2_ext_control *c, struct v4l2_ctrl *ctrl)
1514 {
1515 int idx;
1516
1517 for (idx = 0; idx < ctrl->elems; idx++)
1518 ctrl->type_ops->init(ctrl, idx, ctrl->p_new);
1519
1520 return ptr_to_user(c, ctrl, ctrl->p_new);
1521 }
1522
1523 /* Helper function: copy the caller-provider value to the given control value */
1524 static int user_to_ptr(struct v4l2_ext_control *c,
1525 struct v4l2_ctrl *ctrl,
1526 union v4l2_ctrl_ptr ptr)
1527 {
1528 int ret;
1529 u32 size;
1530
1531 ctrl->is_new = 1;
1532 if (ctrl->is_ptr && !ctrl->is_string) {
1533 unsigned idx;
1534
1535 ret = copy_from_user(ptr.p, c->ptr, c->size) ? -EFAULT : 0;
1536 if (ret || !ctrl->is_array)
1537 return ret;
1538 for (idx = c->size / ctrl->elem_size; idx < ctrl->elems; idx++)
1539 ctrl->type_ops->init(ctrl, idx, ptr);
1540 return 0;
1541 }
1542
1543 switch (ctrl->type) {
1544 case V4L2_CTRL_TYPE_INTEGER64:
1545 *ptr.p_s64 = c->value64;
1546 break;
1547 case V4L2_CTRL_TYPE_STRING:
1548 size = c->size;
1549 if (size == 0)
1550 return -ERANGE;
1551 if (size > ctrl->maximum + 1)
1552 size = ctrl->maximum + 1;
1553 ret = copy_from_user(ptr.p_char, c->string, size) ? -EFAULT : 0;
1554 if (!ret) {
1555 char last = ptr.p_char[size - 1];
1556
1557 ptr.p_char[size - 1] = 0;
1558 /* If the string was longer than ctrl->maximum,
1559 then return an error. */
1560 if (strlen(ptr.p_char) == ctrl->maximum && last)
1561 return -ERANGE;
1562 }
1563 return ret;
1564 default:
1565 *ptr.p_s32 = c->value;
1566 break;
1567 }
1568 return 0;
1569 }
1570
1571 /* Helper function: copy the caller-provider value as the new control value */
1572 static int user_to_new(struct v4l2_ext_control *c,
1573 struct v4l2_ctrl *ctrl)
1574 {
1575 return user_to_ptr(c, ctrl, ctrl->p_new);
1576 }
1577
1578 /* Copy the one value to another. */
1579 static void ptr_to_ptr(struct v4l2_ctrl *ctrl,
1580 union v4l2_ctrl_ptr from, union v4l2_ctrl_ptr to)
1581 {
1582 if (ctrl == NULL)
1583 return;
1584 memcpy(to.p, from.p, ctrl->elems * ctrl->elem_size);
1585 }
1586
1587 /* Copy the new value to the current value. */
1588 static void new_to_cur(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, u32 ch_flags)
1589 {
1590 bool changed;
1591
1592 if (ctrl == NULL)
1593 return;
1594
1595 /* has_changed is set by cluster_changed */
1596 changed = ctrl->has_changed;
1597 if (changed)
1598 ptr_to_ptr(ctrl, ctrl->p_new, ctrl->p_cur);
1599
1600 if (ch_flags & V4L2_EVENT_CTRL_CH_FLAGS) {
1601 /* Note: CH_FLAGS is only set for auto clusters. */
1602 ctrl->flags &=
1603 ~(V4L2_CTRL_FLAG_INACTIVE | V4L2_CTRL_FLAG_VOLATILE);
1604 if (!is_cur_manual(ctrl->cluster[0])) {
1605 ctrl->flags |= V4L2_CTRL_FLAG_INACTIVE;
1606 if (ctrl->cluster[0]->has_volatiles)
1607 ctrl->flags |= V4L2_CTRL_FLAG_VOLATILE;
1608 }
1609 fh = NULL;
1610 }
1611 if (changed || ch_flags) {
1612 /* If a control was changed that was not one of the controls
1613 modified by the application, then send the event to all. */
1614 if (!ctrl->is_new)
1615 fh = NULL;
1616 send_event(fh, ctrl,
1617 (changed ? V4L2_EVENT_CTRL_CH_VALUE : 0) | ch_flags);
1618 if (ctrl->call_notify && changed && ctrl->handler->notify)
1619 ctrl->handler->notify(ctrl, ctrl->handler->notify_priv);
1620 }
1621 }
1622
1623 /* Copy the current value to the new value */
1624 static void cur_to_new(struct v4l2_ctrl *ctrl)
1625 {
1626 if (ctrl == NULL)
1627 return;
1628 ptr_to_ptr(ctrl, ctrl->p_cur, ctrl->p_new);
1629 }
1630
1631 /* Return non-zero if one or more of the controls in the cluster has a new
1632 value that differs from the current value. */
1633 static int cluster_changed(struct v4l2_ctrl *master)
1634 {
1635 bool changed = false;
1636 unsigned idx;
1637 int i;
1638
1639 for (i = 0; i < master->ncontrols; i++) {
1640 struct v4l2_ctrl *ctrl = master->cluster[i];
1641 bool ctrl_changed = false;
1642
1643 if (ctrl == NULL)
1644 continue;
1645
1646 if (ctrl->flags & V4L2_CTRL_FLAG_EXECUTE_ON_WRITE)
1647 changed = ctrl_changed = true;
1648
1649 /*
1650 * Set has_changed to false to avoid generating
1651 * the event V4L2_EVENT_CTRL_CH_VALUE
1652 */
1653 if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE) {
1654 ctrl->has_changed = false;
1655 continue;
1656 }
1657
1658 for (idx = 0; !ctrl_changed && idx < ctrl->elems; idx++)
1659 ctrl_changed = !ctrl->type_ops->equal(ctrl, idx,
1660 ctrl->p_cur, ctrl->p_new);
1661 ctrl->has_changed = ctrl_changed;
1662 changed |= ctrl->has_changed;
1663 }
1664 return changed;
1665 }
1666
1667 /* Control range checking */
1668 static int check_range(enum v4l2_ctrl_type type,
1669 s64 min, s64 max, u64 step, s64 def)
1670 {
1671 switch (type) {
1672 case V4L2_CTRL_TYPE_BOOLEAN:
1673 if (step != 1 || max > 1 || min < 0)
1674 return -ERANGE;
1675 /* fall through */
1676 case V4L2_CTRL_TYPE_U8:
1677 case V4L2_CTRL_TYPE_U16:
1678 case V4L2_CTRL_TYPE_U32:
1679 case V4L2_CTRL_TYPE_INTEGER:
1680 case V4L2_CTRL_TYPE_INTEGER64:
1681 if (step == 0 || min > max || def < min || def > max)
1682 return -ERANGE;
1683 return 0;
1684 case V4L2_CTRL_TYPE_BITMASK:
1685 if (step || min || !max || (def & ~max))
1686 return -ERANGE;
1687 return 0;
1688 case V4L2_CTRL_TYPE_MENU:
1689 case V4L2_CTRL_TYPE_INTEGER_MENU:
1690 if (min > max || def < min || def > max)
1691 return -ERANGE;
1692 /* Note: step == menu_skip_mask for menu controls.
1693 So here we check if the default value is masked out. */
1694 if (step && ((1 << def) & step))
1695 return -EINVAL;
1696 return 0;
1697 case V4L2_CTRL_TYPE_STRING:
1698 if (min > max || min < 0 || step < 1 || def)
1699 return -ERANGE;
1700 return 0;
1701 default:
1702 return 0;
1703 }
1704 }
1705
1706 /* Validate a new control */
1707 static int validate_new(const struct v4l2_ctrl *ctrl, union v4l2_ctrl_ptr p_new)
1708 {
1709 unsigned idx;
1710 int err = 0;
1711
1712 for (idx = 0; !err && idx < ctrl->elems; idx++)
1713 err = ctrl->type_ops->validate(ctrl, idx, p_new);
1714 return err;
1715 }
1716
1717 static inline u32 node2id(struct list_head *node)
1718 {
1719 return list_entry(node, struct v4l2_ctrl_ref, node)->ctrl->id;
1720 }
1721
1722 /* Set the handler's error code if it wasn't set earlier already */
1723 static inline int handler_set_err(struct v4l2_ctrl_handler *hdl, int err)
1724 {
1725 if (hdl->error == 0)
1726 hdl->error = err;
1727 return err;
1728 }
1729
1730 /* Initialize the handler */
1731 int v4l2_ctrl_handler_init_class(struct v4l2_ctrl_handler *hdl,
1732 unsigned nr_of_controls_hint,
1733 struct lock_class_key *key, const char *name)
1734 {
1735 hdl->lock = &hdl->_lock;
1736 mutex_init(hdl->lock);
1737 lockdep_set_class_and_name(hdl->lock, key, name);
1738 INIT_LIST_HEAD(&hdl->ctrls);
1739 INIT_LIST_HEAD(&hdl->ctrl_refs);
1740 hdl->nr_of_buckets = 1 + nr_of_controls_hint / 8;
1741 hdl->buckets = kcalloc(hdl->nr_of_buckets, sizeof(hdl->buckets[0]),
1742 GFP_KERNEL);
1743 hdl->error = hdl->buckets ? 0 : -ENOMEM;
1744 return hdl->error;
1745 }
1746 EXPORT_SYMBOL(v4l2_ctrl_handler_init_class);
1747
1748 /* Free all controls and control refs */
1749 void v4l2_ctrl_handler_free(struct v4l2_ctrl_handler *hdl)
1750 {
1751 struct v4l2_ctrl_ref *ref, *next_ref;
1752 struct v4l2_ctrl *ctrl, *next_ctrl;
1753 struct v4l2_subscribed_event *sev, *next_sev;
1754
1755 if (hdl == NULL || hdl->buckets == NULL)
1756 return;
1757
1758 mutex_lock(hdl->lock);
1759 /* Free all nodes */
1760 list_for_each_entry_safe(ref, next_ref, &hdl->ctrl_refs, node) {
1761 list_del(&ref->node);
1762 kfree(ref);
1763 }
1764 /* Free all controls owned by the handler */
1765 list_for_each_entry_safe(ctrl, next_ctrl, &hdl->ctrls, node) {
1766 list_del(&ctrl->node);
1767 list_for_each_entry_safe(sev, next_sev, &ctrl->ev_subs, node)
1768 list_del(&sev->node);
1769 kfree(ctrl);
1770 }
1771 kfree(hdl->buckets);
1772 hdl->buckets = NULL;
1773 hdl->cached = NULL;
1774 hdl->error = 0;
1775 mutex_unlock(hdl->lock);
1776 }
1777 EXPORT_SYMBOL(v4l2_ctrl_handler_free);
1778
1779 /* For backwards compatibility: V4L2_CID_PRIVATE_BASE should no longer
1780 be used except in G_CTRL, S_CTRL, QUERYCTRL and QUERYMENU when dealing
1781 with applications that do not use the NEXT_CTRL flag.
1782
1783 We just find the n-th private user control. It's O(N), but that should not
1784 be an issue in this particular case. */
1785 static struct v4l2_ctrl_ref *find_private_ref(
1786 struct v4l2_ctrl_handler *hdl, u32 id)
1787 {
1788 struct v4l2_ctrl_ref *ref;
1789
1790 id -= V4L2_CID_PRIVATE_BASE;
1791 list_for_each_entry(ref, &hdl->ctrl_refs, node) {
1792 /* Search for private user controls that are compatible with
1793 VIDIOC_G/S_CTRL. */
1794 if (V4L2_CTRL_ID2WHICH(ref->ctrl->id) == V4L2_CTRL_CLASS_USER &&
1795 V4L2_CTRL_DRIVER_PRIV(ref->ctrl->id)) {
1796 if (!ref->ctrl->is_int)
1797 continue;
1798 if (id == 0)
1799 return ref;
1800 id--;
1801 }
1802 }
1803 return NULL;
1804 }
1805
1806 /* Find a control with the given ID. */
1807 static struct v4l2_ctrl_ref *find_ref(struct v4l2_ctrl_handler *hdl, u32 id)
1808 {
1809 struct v4l2_ctrl_ref *ref;
1810 int bucket;
1811
1812 id &= V4L2_CTRL_ID_MASK;
1813
1814 /* Old-style private controls need special handling */
1815 if (id >= V4L2_CID_PRIVATE_BASE)
1816 return find_private_ref(hdl, id);
1817 bucket = id % hdl->nr_of_buckets;
1818
1819 /* Simple optimization: cache the last control found */
1820 if (hdl->cached && hdl->cached->ctrl->id == id)
1821 return hdl->cached;
1822
1823 /* Not in cache, search the hash */
1824 ref = hdl->buckets ? hdl->buckets[bucket] : NULL;
1825 while (ref && ref->ctrl->id != id)
1826 ref = ref->next;
1827
1828 if (ref)
1829 hdl->cached = ref; /* cache it! */
1830 return ref;
1831 }
1832
1833 /* Find a control with the given ID. Take the handler's lock first. */
1834 static struct v4l2_ctrl_ref *find_ref_lock(
1835 struct v4l2_ctrl_handler *hdl, u32 id)
1836 {
1837 struct v4l2_ctrl_ref *ref = NULL;
1838
1839 if (hdl) {
1840 mutex_lock(hdl->lock);
1841 ref = find_ref(hdl, id);
1842 mutex_unlock(hdl->lock);
1843 }
1844 return ref;
1845 }
1846
1847 /* Find a control with the given ID. */
1848 struct v4l2_ctrl *v4l2_ctrl_find(struct v4l2_ctrl_handler *hdl, u32 id)
1849 {
1850 struct v4l2_ctrl_ref *ref = find_ref_lock(hdl, id);
1851
1852 return ref ? ref->ctrl : NULL;
1853 }
1854 EXPORT_SYMBOL(v4l2_ctrl_find);
1855
1856 /* Allocate a new v4l2_ctrl_ref and hook it into the handler. */
1857 static int handler_new_ref(struct v4l2_ctrl_handler *hdl,
1858 struct v4l2_ctrl *ctrl)
1859 {
1860 struct v4l2_ctrl_ref *ref;
1861 struct v4l2_ctrl_ref *new_ref;
1862 u32 id = ctrl->id;
1863 u32 class_ctrl = V4L2_CTRL_ID2WHICH(id) | 1;
1864 int bucket = id % hdl->nr_of_buckets; /* which bucket to use */
1865
1866 /*
1867 * Automatically add the control class if it is not yet present and
1868 * the new control is not a compound control.
1869 */
1870 if (ctrl->type < V4L2_CTRL_COMPOUND_TYPES &&
1871 id != class_ctrl && find_ref_lock(hdl, class_ctrl) == NULL)
1872 if (!v4l2_ctrl_new_std(hdl, NULL, class_ctrl, 0, 0, 0, 0))
1873 return hdl->error;
1874
1875 if (hdl->error)
1876 return hdl->error;
1877
1878 new_ref = kzalloc(sizeof(*new_ref), GFP_KERNEL);
1879 if (!new_ref)
1880 return handler_set_err(hdl, -ENOMEM);
1881 new_ref->ctrl = ctrl;
1882 if (ctrl->handler == hdl) {
1883 /* By default each control starts in a cluster of its own.
1884 new_ref->ctrl is basically a cluster array with one
1885 element, so that's perfect to use as the cluster pointer.
1886 But only do this for the handler that owns the control. */
1887 ctrl->cluster = &new_ref->ctrl;
1888 ctrl->ncontrols = 1;
1889 }
1890
1891 INIT_LIST_HEAD(&new_ref->node);
1892
1893 mutex_lock(hdl->lock);
1894
1895 /* Add immediately at the end of the list if the list is empty, or if
1896 the last element in the list has a lower ID.
1897 This ensures that when elements are added in ascending order the
1898 insertion is an O(1) operation. */
1899 if (list_empty(&hdl->ctrl_refs) || id > node2id(hdl->ctrl_refs.prev)) {
1900 list_add_tail(&new_ref->node, &hdl->ctrl_refs);
1901 goto insert_in_hash;
1902 }
1903
1904 /* Find insert position in sorted list */
1905 list_for_each_entry(ref, &hdl->ctrl_refs, node) {
1906 if (ref->ctrl->id < id)
1907 continue;
1908 /* Don't add duplicates */
1909 if (ref->ctrl->id == id) {
1910 kfree(new_ref);
1911 goto unlock;
1912 }
1913 list_add(&new_ref->node, ref->node.prev);
1914 break;
1915 }
1916
1917 insert_in_hash:
1918 /* Insert the control node in the hash */
1919 new_ref->next = hdl->buckets[bucket];
1920 hdl->buckets[bucket] = new_ref;
1921
1922 unlock:
1923 mutex_unlock(hdl->lock);
1924 return 0;
1925 }
1926
1927 /* Add a new control */
1928 static struct v4l2_ctrl *v4l2_ctrl_new(struct v4l2_ctrl_handler *hdl,
1929 const struct v4l2_ctrl_ops *ops,
1930 const struct v4l2_ctrl_type_ops *type_ops,
1931 u32 id, const char *name, enum v4l2_ctrl_type type,
1932 s64 min, s64 max, u64 step, s64 def,
1933 const u32 dims[V4L2_CTRL_MAX_DIMS], u32 elem_size,
1934 u32 flags, const char * const *qmenu,
1935 const s64 *qmenu_int, void *priv)
1936 {
1937 struct v4l2_ctrl *ctrl;
1938 unsigned sz_extra;
1939 unsigned nr_of_dims = 0;
1940 unsigned elems = 1;
1941 bool is_array;
1942 unsigned tot_ctrl_size;
1943 unsigned idx;
1944 void *data;
1945 int err;
1946
1947 if (hdl->error)
1948 return NULL;
1949
1950 while (dims && dims[nr_of_dims]) {
1951 elems *= dims[nr_of_dims];
1952 nr_of_dims++;
1953 if (nr_of_dims == V4L2_CTRL_MAX_DIMS)
1954 break;
1955 }
1956 is_array = nr_of_dims > 0;
1957
1958 /* Prefill elem_size for all types handled by std_type_ops */
1959 switch (type) {
1960 case V4L2_CTRL_TYPE_INTEGER64:
1961 elem_size = sizeof(s64);
1962 break;
1963 case V4L2_CTRL_TYPE_STRING:
1964 elem_size = max + 1;
1965 break;
1966 case V4L2_CTRL_TYPE_U8:
1967 elem_size = sizeof(u8);
1968 break;
1969 case V4L2_CTRL_TYPE_U16:
1970 elem_size = sizeof(u16);
1971 break;
1972 case V4L2_CTRL_TYPE_U32:
1973 elem_size = sizeof(u32);
1974 break;
1975 default:
1976 if (type < V4L2_CTRL_COMPOUND_TYPES)
1977 elem_size = sizeof(s32);
1978 break;
1979 }
1980 tot_ctrl_size = elem_size * elems;
1981
1982 /* Sanity checks */
1983 if (id == 0 || name == NULL || !elem_size ||
1984 id >= V4L2_CID_PRIVATE_BASE ||
1985 (type == V4L2_CTRL_TYPE_MENU && qmenu == NULL) ||
1986 (type == V4L2_CTRL_TYPE_INTEGER_MENU && qmenu_int == NULL)) {
1987 handler_set_err(hdl, -ERANGE);
1988 return NULL;
1989 }
1990 err = check_range(type, min, max, step, def);
1991 if (err) {
1992 handler_set_err(hdl, err);
1993 return NULL;
1994 }
1995 if (type == V4L2_CTRL_TYPE_BITMASK && ((def & ~max) || min || step)) {
1996 handler_set_err(hdl, -ERANGE);
1997 return NULL;
1998 }
1999 if (is_array &&
2000 (type == V4L2_CTRL_TYPE_BUTTON ||
2001 type == V4L2_CTRL_TYPE_CTRL_CLASS)) {
2002 handler_set_err(hdl, -EINVAL);
2003 return NULL;
2004 }
2005
2006 sz_extra = 0;
2007 if (type == V4L2_CTRL_TYPE_BUTTON)
2008 flags |= V4L2_CTRL_FLAG_WRITE_ONLY |
2009 V4L2_CTRL_FLAG_EXECUTE_ON_WRITE;
2010 else if (type == V4L2_CTRL_TYPE_CTRL_CLASS)
2011 flags |= V4L2_CTRL_FLAG_READ_ONLY;
2012 else if (type == V4L2_CTRL_TYPE_INTEGER64 ||
2013 type == V4L2_CTRL_TYPE_STRING ||
2014 type >= V4L2_CTRL_COMPOUND_TYPES ||
2015 is_array)
2016 sz_extra += 2 * tot_ctrl_size;
2017
2018 ctrl = kzalloc(sizeof(*ctrl) + sz_extra, GFP_KERNEL);
2019 if (ctrl == NULL) {
2020 handler_set_err(hdl, -ENOMEM);
2021 return NULL;
2022 }
2023
2024 INIT_LIST_HEAD(&ctrl->node);
2025 INIT_LIST_HEAD(&ctrl->ev_subs);
2026 ctrl->handler = hdl;
2027 ctrl->ops = ops;
2028 ctrl->type_ops = type_ops ? type_ops : &std_type_ops;
2029 ctrl->id = id;
2030 ctrl->name = name;
2031 ctrl->type = type;
2032 ctrl->flags = flags;
2033 ctrl->minimum = min;
2034 ctrl->maximum = max;
2035 ctrl->step = step;
2036 ctrl->default_value = def;
2037 ctrl->is_string = !is_array && type == V4L2_CTRL_TYPE_STRING;
2038 ctrl->is_ptr = is_array || type >= V4L2_CTRL_COMPOUND_TYPES || ctrl->is_string;
2039 ctrl->is_int = !ctrl->is_ptr && type != V4L2_CTRL_TYPE_INTEGER64;
2040 ctrl->is_array = is_array;
2041 ctrl->elems = elems;
2042 ctrl->nr_of_dims = nr_of_dims;
2043 if (nr_of_dims)
2044 memcpy(ctrl->dims, dims, nr_of_dims * sizeof(dims[0]));
2045 ctrl->elem_size = elem_size;
2046 if (type == V4L2_CTRL_TYPE_MENU)
2047 ctrl->qmenu = qmenu;
2048 else if (type == V4L2_CTRL_TYPE_INTEGER_MENU)
2049 ctrl->qmenu_int = qmenu_int;
2050 ctrl->priv = priv;
2051 ctrl->cur.val = ctrl->val = def;
2052 data = &ctrl[1];
2053
2054 if (!ctrl->is_int) {
2055 ctrl->p_new.p = data;
2056 ctrl->p_cur.p = data + tot_ctrl_size;
2057 } else {
2058 ctrl->p_new.p = &ctrl->val;
2059 ctrl->p_cur.p = &ctrl->cur.val;
2060 }
2061 for (idx = 0; idx < elems; idx++) {
2062 ctrl->type_ops->init(ctrl, idx, ctrl->p_cur);
2063 ctrl->type_ops->init(ctrl, idx, ctrl->p_new);
2064 }
2065
2066 if (handler_new_ref(hdl, ctrl)) {
2067 kfree(ctrl);
2068 return NULL;
2069 }
2070 mutex_lock(hdl->lock);
2071 list_add_tail(&ctrl->node, &hdl->ctrls);
2072 mutex_unlock(hdl->lock);
2073 return ctrl;
2074 }
2075
2076 struct v4l2_ctrl *v4l2_ctrl_new_custom(struct v4l2_ctrl_handler *hdl,
2077 const struct v4l2_ctrl_config *cfg, void *priv)
2078 {
2079 bool is_menu;
2080 struct v4l2_ctrl *ctrl;
2081 const char *name = cfg->name;
2082 const char * const *qmenu = cfg->qmenu;
2083 const s64 *qmenu_int = cfg->qmenu_int;
2084 enum v4l2_ctrl_type type = cfg->type;
2085 u32 flags = cfg->flags;
2086 s64 min = cfg->min;
2087 s64 max = cfg->max;
2088 u64 step = cfg->step;
2089 s64 def = cfg->def;
2090
2091 if (name == NULL)
2092 v4l2_ctrl_fill(cfg->id, &name, &type, &min, &max, &step,
2093 &def, &flags);
2094
2095 is_menu = (cfg->type == V4L2_CTRL_TYPE_MENU ||
2096 cfg->type == V4L2_CTRL_TYPE_INTEGER_MENU);
2097 if (is_menu)
2098 WARN_ON(step);
2099 else
2100 WARN_ON(cfg->menu_skip_mask);
2101 if (cfg->type == V4L2_CTRL_TYPE_MENU && qmenu == NULL)
2102 qmenu = v4l2_ctrl_get_menu(cfg->id);
2103 else if (cfg->type == V4L2_CTRL_TYPE_INTEGER_MENU &&
2104 qmenu_int == NULL) {
2105 handler_set_err(hdl, -EINVAL);
2106 return NULL;
2107 }
2108
2109 ctrl = v4l2_ctrl_new(hdl, cfg->ops, cfg->type_ops, cfg->id, name,
2110 type, min, max,
2111 is_menu ? cfg->menu_skip_mask : step, def,
2112 cfg->dims, cfg->elem_size,
2113 flags, qmenu, qmenu_int, priv);
2114 if (ctrl)
2115 ctrl->is_private = cfg->is_private;
2116 return ctrl;
2117 }
2118 EXPORT_SYMBOL(v4l2_ctrl_new_custom);
2119
2120 /* Helper function for standard non-menu controls */
2121 struct v4l2_ctrl *v4l2_ctrl_new_std(struct v4l2_ctrl_handler *hdl,
2122 const struct v4l2_ctrl_ops *ops,
2123 u32 id, s64 min, s64 max, u64 step, s64 def)
2124 {
2125 const char *name;
2126 enum v4l2_ctrl_type type;
2127 u32 flags;
2128
2129 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
2130 if (type == V4L2_CTRL_TYPE_MENU ||
2131 type == V4L2_CTRL_TYPE_INTEGER_MENU ||
2132 type >= V4L2_CTRL_COMPOUND_TYPES) {
2133 handler_set_err(hdl, -EINVAL);
2134 return NULL;
2135 }
2136 return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
2137 min, max, step, def, NULL, 0,
2138 flags, NULL, NULL, NULL);
2139 }
2140 EXPORT_SYMBOL(v4l2_ctrl_new_std);
2141
2142 /* Helper function for standard menu controls */
2143 struct v4l2_ctrl *v4l2_ctrl_new_std_menu(struct v4l2_ctrl_handler *hdl,
2144 const struct v4l2_ctrl_ops *ops,
2145 u32 id, u8 _max, u64 mask, u8 _def)
2146 {
2147 const char * const *qmenu = NULL;
2148 const s64 *qmenu_int = NULL;
2149 unsigned int qmenu_int_len = 0;
2150 const char *name;
2151 enum v4l2_ctrl_type type;
2152 s64 min;
2153 s64 max = _max;
2154 s64 def = _def;
2155 u64 step;
2156 u32 flags;
2157
2158 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
2159
2160 if (type == V4L2_CTRL_TYPE_MENU)
2161 qmenu = v4l2_ctrl_get_menu(id);
2162 else if (type == V4L2_CTRL_TYPE_INTEGER_MENU)
2163 qmenu_int = v4l2_ctrl_get_int_menu(id, &qmenu_int_len);
2164
2165 if ((!qmenu && !qmenu_int) || (qmenu_int && max > qmenu_int_len)) {
2166 handler_set_err(hdl, -EINVAL);
2167 return NULL;
2168 }
2169 return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
2170 0, max, mask, def, NULL, 0,
2171 flags, qmenu, qmenu_int, NULL);
2172 }
2173 EXPORT_SYMBOL(v4l2_ctrl_new_std_menu);
2174
2175 /* Helper function for standard menu controls with driver defined menu */
2176 struct v4l2_ctrl *v4l2_ctrl_new_std_menu_items(struct v4l2_ctrl_handler *hdl,
2177 const struct v4l2_ctrl_ops *ops, u32 id, u8 _max,
2178 u64 mask, u8 _def, const char * const *qmenu)
2179 {
2180 enum v4l2_ctrl_type type;
2181 const char *name;
2182 u32 flags;
2183 u64 step;
2184 s64 min;
2185 s64 max = _max;
2186 s64 def = _def;
2187
2188 /* v4l2_ctrl_new_std_menu_items() should only be called for
2189 * standard controls without a standard menu.
2190 */
2191 if (v4l2_ctrl_get_menu(id)) {
2192 handler_set_err(hdl, -EINVAL);
2193 return NULL;
2194 }
2195
2196 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
2197 if (type != V4L2_CTRL_TYPE_MENU || qmenu == NULL) {
2198 handler_set_err(hdl, -EINVAL);
2199 return NULL;
2200 }
2201 return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
2202 0, max, mask, def, NULL, 0,
2203 flags, qmenu, NULL, NULL);
2204
2205 }
2206 EXPORT_SYMBOL(v4l2_ctrl_new_std_menu_items);
2207
2208 /* Helper function for standard integer menu controls */
2209 struct v4l2_ctrl *v4l2_ctrl_new_int_menu(struct v4l2_ctrl_handler *hdl,
2210 const struct v4l2_ctrl_ops *ops,
2211 u32 id, u8 _max, u8 _def, const s64 *qmenu_int)
2212 {
2213 const char *name;
2214 enum v4l2_ctrl_type type;
2215 s64 min;
2216 u64 step;
2217 s64 max = _max;
2218 s64 def = _def;
2219 u32 flags;
2220
2221 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
2222 if (type != V4L2_CTRL_TYPE_INTEGER_MENU) {
2223 handler_set_err(hdl, -EINVAL);
2224 return NULL;
2225 }
2226 return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
2227 0, max, 0, def, NULL, 0,
2228 flags, NULL, qmenu_int, NULL);
2229 }
2230 EXPORT_SYMBOL(v4l2_ctrl_new_int_menu);
2231
2232 /* Add the controls from another handler to our own. */
2233 int v4l2_ctrl_add_handler(struct v4l2_ctrl_handler *hdl,
2234 struct v4l2_ctrl_handler *add,
2235 bool (*filter)(const struct v4l2_ctrl *ctrl))
2236 {
2237 struct v4l2_ctrl_ref *ref;
2238 int ret = 0;
2239
2240 /* Do nothing if either handler is NULL or if they are the same */
2241 if (!hdl || !add || hdl == add)
2242 return 0;
2243 if (hdl->error)
2244 return hdl->error;
2245 mutex_lock(add->lock);
2246 list_for_each_entry(ref, &add->ctrl_refs, node) {
2247 struct v4l2_ctrl *ctrl = ref->ctrl;
2248
2249 /* Skip handler-private controls. */
2250 if (ctrl->is_private)
2251 continue;
2252 /* And control classes */
2253 if (ctrl->type == V4L2_CTRL_TYPE_CTRL_CLASS)
2254 continue;
2255 /* Filter any unwanted controls */
2256 if (filter && !filter(ctrl))
2257 continue;
2258 ret = handler_new_ref(hdl, ctrl);
2259 if (ret)
2260 break;
2261 }
2262 mutex_unlock(add->lock);
2263 return ret;
2264 }
2265 EXPORT_SYMBOL(v4l2_ctrl_add_handler);
2266
2267 bool v4l2_ctrl_radio_filter(const struct v4l2_ctrl *ctrl)
2268 {
2269 if (V4L2_CTRL_ID2WHICH(ctrl->id) == V4L2_CTRL_CLASS_FM_TX)
2270 return true;
2271 if (V4L2_CTRL_ID2WHICH(ctrl->id) == V4L2_CTRL_CLASS_FM_RX)
2272 return true;
2273 switch (ctrl->id) {
2274 case V4L2_CID_AUDIO_MUTE:
2275 case V4L2_CID_AUDIO_VOLUME:
2276 case V4L2_CID_AUDIO_BALANCE:
2277 case V4L2_CID_AUDIO_BASS:
2278 case V4L2_CID_AUDIO_TREBLE:
2279 case V4L2_CID_AUDIO_LOUDNESS:
2280 return true;
2281 default:
2282 break;
2283 }
2284 return false;
2285 }
2286 EXPORT_SYMBOL(v4l2_ctrl_radio_filter);
2287
2288 /* Cluster controls */
2289 void v4l2_ctrl_cluster(unsigned ncontrols, struct v4l2_ctrl **controls)
2290 {
2291 bool has_volatiles = false;
2292 int i;
2293
2294 /* The first control is the master control and it must not be NULL */
2295 if (WARN_ON(ncontrols == 0 || controls[0] == NULL))
2296 return;
2297
2298 for (i = 0; i < ncontrols; i++) {
2299 if (controls[i]) {
2300 controls[i]->cluster = controls;
2301 controls[i]->ncontrols = ncontrols;
2302 if (controls[i]->flags & V4L2_CTRL_FLAG_VOLATILE)
2303 has_volatiles = true;
2304 }
2305 }
2306 controls[0]->has_volatiles = has_volatiles;
2307 }
2308 EXPORT_SYMBOL(v4l2_ctrl_cluster);
2309
2310 void v4l2_ctrl_auto_cluster(unsigned ncontrols, struct v4l2_ctrl **controls,
2311 u8 manual_val, bool set_volatile)
2312 {
2313 struct v4l2_ctrl *master = controls[0];
2314 u32 flag = 0;
2315 int i;
2316
2317 v4l2_ctrl_cluster(ncontrols, controls);
2318 WARN_ON(ncontrols <= 1);
2319 WARN_ON(manual_val < master->minimum || manual_val > master->maximum);
2320 WARN_ON(set_volatile && !has_op(master, g_volatile_ctrl));
2321 master->is_auto = true;
2322 master->has_volatiles = set_volatile;
2323 master->manual_mode_value = manual_val;
2324 master->flags |= V4L2_CTRL_FLAG_UPDATE;
2325
2326 if (!is_cur_manual(master))
2327 flag = V4L2_CTRL_FLAG_INACTIVE |
2328 (set_volatile ? V4L2_CTRL_FLAG_VOLATILE : 0);
2329
2330 for (i = 1; i < ncontrols; i++)
2331 if (controls[i])
2332 controls[i]->flags |= flag;
2333 }
2334 EXPORT_SYMBOL(v4l2_ctrl_auto_cluster);
2335
2336 /* Activate/deactivate a control. */
2337 void v4l2_ctrl_activate(struct v4l2_ctrl *ctrl, bool active)
2338 {
2339 /* invert since the actual flag is called 'inactive' */
2340 bool inactive = !active;
2341 bool old;
2342
2343 if (ctrl == NULL)
2344 return;
2345
2346 if (inactive)
2347 /* set V4L2_CTRL_FLAG_INACTIVE */
2348 old = test_and_set_bit(4, &ctrl->flags);
2349 else
2350 /* clear V4L2_CTRL_FLAG_INACTIVE */
2351 old = test_and_clear_bit(4, &ctrl->flags);
2352 if (old != inactive)
2353 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_FLAGS);
2354 }
2355 EXPORT_SYMBOL(v4l2_ctrl_activate);
2356
2357 /* Grab/ungrab a control.
2358 Typically used when streaming starts and you want to grab controls,
2359 preventing the user from changing them.
2360
2361 Just call this and the framework will block any attempts to change
2362 these controls. */
2363 void v4l2_ctrl_grab(struct v4l2_ctrl *ctrl, bool grabbed)
2364 {
2365 bool old;
2366
2367 if (ctrl == NULL)
2368 return;
2369
2370 v4l2_ctrl_lock(ctrl);
2371 if (grabbed)
2372 /* set V4L2_CTRL_FLAG_GRABBED */
2373 old = test_and_set_bit(1, &ctrl->flags);
2374 else
2375 /* clear V4L2_CTRL_FLAG_GRABBED */
2376 old = test_and_clear_bit(1, &ctrl->flags);
2377 if (old != grabbed)
2378 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_FLAGS);
2379 v4l2_ctrl_unlock(ctrl);
2380 }
2381 EXPORT_SYMBOL(v4l2_ctrl_grab);
2382
2383 /* Log the control name and value */
2384 static void log_ctrl(const struct v4l2_ctrl *ctrl,
2385 const char *prefix, const char *colon)
2386 {
2387 if (ctrl->flags & (V4L2_CTRL_FLAG_DISABLED | V4L2_CTRL_FLAG_WRITE_ONLY))
2388 return;
2389 if (ctrl->type == V4L2_CTRL_TYPE_CTRL_CLASS)
2390 return;
2391
2392 pr_info("%s%s%s: ", prefix, colon, ctrl->name);
2393
2394 ctrl->type_ops->log(ctrl);
2395
2396 if (ctrl->flags & (V4L2_CTRL_FLAG_INACTIVE |
2397 V4L2_CTRL_FLAG_GRABBED |
2398 V4L2_CTRL_FLAG_VOLATILE)) {
2399 if (ctrl->flags & V4L2_CTRL_FLAG_INACTIVE)
2400 pr_cont(" inactive");
2401 if (ctrl->flags & V4L2_CTRL_FLAG_GRABBED)
2402 pr_cont(" grabbed");
2403 if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE)
2404 pr_cont(" volatile");
2405 }
2406 pr_cont("\n");
2407 }
2408
2409 /* Log all controls owned by the handler */
2410 void v4l2_ctrl_handler_log_status(struct v4l2_ctrl_handler *hdl,
2411 const char *prefix)
2412 {
2413 struct v4l2_ctrl *ctrl;
2414 const char *colon = "";
2415 int len;
2416
2417 if (hdl == NULL)
2418 return;
2419 if (prefix == NULL)
2420 prefix = "";
2421 len = strlen(prefix);
2422 if (len && prefix[len - 1] != ' ')
2423 colon = ": ";
2424 mutex_lock(hdl->lock);
2425 list_for_each_entry(ctrl, &hdl->ctrls, node)
2426 if (!(ctrl->flags & V4L2_CTRL_FLAG_DISABLED))
2427 log_ctrl(ctrl, prefix, colon);
2428 mutex_unlock(hdl->lock);
2429 }
2430 EXPORT_SYMBOL(v4l2_ctrl_handler_log_status);
2431
2432 int v4l2_ctrl_subdev_log_status(struct v4l2_subdev *sd)
2433 {
2434 v4l2_ctrl_handler_log_status(sd->ctrl_handler, sd->name);
2435 return 0;
2436 }
2437 EXPORT_SYMBOL(v4l2_ctrl_subdev_log_status);
2438
2439 /* Call s_ctrl for all controls owned by the handler */
2440 int v4l2_ctrl_handler_setup(struct v4l2_ctrl_handler *hdl)
2441 {
2442 struct v4l2_ctrl *ctrl;
2443 int ret = 0;
2444
2445 if (hdl == NULL)
2446 return 0;
2447 mutex_lock(hdl->lock);
2448 list_for_each_entry(ctrl, &hdl->ctrls, node)
2449 ctrl->done = false;
2450
2451 list_for_each_entry(ctrl, &hdl->ctrls, node) {
2452 struct v4l2_ctrl *master = ctrl->cluster[0];
2453 int i;
2454
2455 /* Skip if this control was already handled by a cluster. */
2456 /* Skip button controls and read-only controls. */
2457 if (ctrl->done || ctrl->type == V4L2_CTRL_TYPE_BUTTON ||
2458 (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY))
2459 continue;
2460
2461 for (i = 0; i < master->ncontrols; i++) {
2462 if (master->cluster[i]) {
2463 cur_to_new(master->cluster[i]);
2464 master->cluster[i]->is_new = 1;
2465 master->cluster[i]->done = true;
2466 }
2467 }
2468 ret = call_op(master, s_ctrl);
2469 if (ret)
2470 break;
2471 }
2472 mutex_unlock(hdl->lock);
2473 return ret;
2474 }
2475 EXPORT_SYMBOL(v4l2_ctrl_handler_setup);
2476
2477 /* Implement VIDIOC_QUERY_EXT_CTRL */
2478 int v4l2_query_ext_ctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_query_ext_ctrl *qc)
2479 {
2480 const unsigned next_flags = V4L2_CTRL_FLAG_NEXT_CTRL | V4L2_CTRL_FLAG_NEXT_COMPOUND;
2481 u32 id = qc->id & V4L2_CTRL_ID_MASK;
2482 struct v4l2_ctrl_ref *ref;
2483 struct v4l2_ctrl *ctrl;
2484
2485 if (hdl == NULL)
2486 return -EINVAL;
2487
2488 mutex_lock(hdl->lock);
2489
2490 /* Try to find it */
2491 ref = find_ref(hdl, id);
2492
2493 if ((qc->id & next_flags) && !list_empty(&hdl->ctrl_refs)) {
2494 bool is_compound;
2495 /* Match any control that is not hidden */
2496 unsigned mask = 1;
2497 bool match = false;
2498
2499 if ((qc->id & next_flags) == V4L2_CTRL_FLAG_NEXT_COMPOUND) {
2500 /* Match any hidden control */
2501 match = true;
2502 } else if ((qc->id & next_flags) == next_flags) {
2503 /* Match any control, compound or not */
2504 mask = 0;
2505 }
2506
2507 /* Find the next control with ID > qc->id */
2508
2509 /* Did we reach the end of the control list? */
2510 if (id >= node2id(hdl->ctrl_refs.prev)) {
2511 ref = NULL; /* Yes, so there is no next control */
2512 } else if (ref) {
2513 /* We found a control with the given ID, so just get
2514 the next valid one in the list. */
2515 list_for_each_entry_continue(ref, &hdl->ctrl_refs, node) {
2516 is_compound = ref->ctrl->is_array ||
2517 ref->ctrl->type >= V4L2_CTRL_COMPOUND_TYPES;
2518 if (id < ref->ctrl->id &&
2519 (is_compound & mask) == match)
2520 break;
2521 }
2522 if (&ref->node == &hdl->ctrl_refs)
2523 ref = NULL;
2524 } else {
2525 /* No control with the given ID exists, so start
2526 searching for the next largest ID. We know there
2527 is one, otherwise the first 'if' above would have
2528 been true. */
2529 list_for_each_entry(ref, &hdl->ctrl_refs, node) {
2530 is_compound = ref->ctrl->is_array ||
2531 ref->ctrl->type >= V4L2_CTRL_COMPOUND_TYPES;
2532 if (id < ref->ctrl->id &&
2533 (is_compound & mask) == match)
2534 break;
2535 }
2536 if (&ref->node == &hdl->ctrl_refs)
2537 ref = NULL;
2538 }
2539 }
2540 mutex_unlock(hdl->lock);
2541
2542 if (!ref)
2543 return -EINVAL;
2544
2545 ctrl = ref->ctrl;
2546 memset(qc, 0, sizeof(*qc));
2547 if (id >= V4L2_CID_PRIVATE_BASE)
2548 qc->id = id;
2549 else
2550 qc->id = ctrl->id;
2551 strlcpy(qc->name, ctrl->name, sizeof(qc->name));
2552 qc->flags = ctrl->flags;
2553 qc->type = ctrl->type;
2554 if (ctrl->is_ptr)
2555 qc->flags |= V4L2_CTRL_FLAG_HAS_PAYLOAD;
2556 qc->elem_size = ctrl->elem_size;
2557 qc->elems = ctrl->elems;
2558 qc->nr_of_dims = ctrl->nr_of_dims;
2559 memcpy(qc->dims, ctrl->dims, qc->nr_of_dims * sizeof(qc->dims[0]));
2560 qc->minimum = ctrl->minimum;
2561 qc->maximum = ctrl->maximum;
2562 qc->default_value = ctrl->default_value;
2563 if (ctrl->type == V4L2_CTRL_TYPE_MENU
2564 || ctrl->type == V4L2_CTRL_TYPE_INTEGER_MENU)
2565 qc->step = 1;
2566 else
2567 qc->step = ctrl->step;
2568 return 0;
2569 }
2570 EXPORT_SYMBOL(v4l2_query_ext_ctrl);
2571
2572 /* Implement VIDIOC_QUERYCTRL */
2573 int v4l2_queryctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_queryctrl *qc)
2574 {
2575 struct v4l2_query_ext_ctrl qec = { qc->id };
2576 int rc;
2577
2578 rc = v4l2_query_ext_ctrl(hdl, &qec);
2579 if (rc)
2580 return rc;
2581
2582 qc->id = qec.id;
2583 qc->type = qec.type;
2584 qc->flags = qec.flags;
2585 strlcpy(qc->name, qec.name, sizeof(qc->name));
2586 switch (qc->type) {
2587 case V4L2_CTRL_TYPE_INTEGER:
2588 case V4L2_CTRL_TYPE_BOOLEAN:
2589 case V4L2_CTRL_TYPE_MENU:
2590 case V4L2_CTRL_TYPE_INTEGER_MENU:
2591 case V4L2_CTRL_TYPE_STRING:
2592 case V4L2_CTRL_TYPE_BITMASK:
2593 qc->minimum = qec.minimum;
2594 qc->maximum = qec.maximum;
2595 qc->step = qec.step;
2596 qc->default_value = qec.default_value;
2597 break;
2598 default:
2599 qc->minimum = 0;
2600 qc->maximum = 0;
2601 qc->step = 0;
2602 qc->default_value = 0;
2603 break;
2604 }
2605 return 0;
2606 }
2607 EXPORT_SYMBOL(v4l2_queryctrl);
2608
2609 /* Implement VIDIOC_QUERYMENU */
2610 int v4l2_querymenu(struct v4l2_ctrl_handler *hdl, struct v4l2_querymenu *qm)
2611 {
2612 struct v4l2_ctrl *ctrl;
2613 u32 i = qm->index;
2614
2615 ctrl = v4l2_ctrl_find(hdl, qm->id);
2616 if (!ctrl)
2617 return -EINVAL;
2618
2619 qm->reserved = 0;
2620 /* Sanity checks */
2621 switch (ctrl->type) {
2622 case V4L2_CTRL_TYPE_MENU:
2623 if (ctrl->qmenu == NULL)
2624 return -EINVAL;
2625 break;
2626 case V4L2_CTRL_TYPE_INTEGER_MENU:
2627 if (ctrl->qmenu_int == NULL)
2628 return -EINVAL;
2629 break;
2630 default:
2631 return -EINVAL;
2632 }
2633
2634 if (i < ctrl->minimum || i > ctrl->maximum)
2635 return -EINVAL;
2636
2637 /* Use mask to see if this menu item should be skipped */
2638 if (ctrl->menu_skip_mask & (1 << i))
2639 return -EINVAL;
2640 /* Empty menu items should also be skipped */
2641 if (ctrl->type == V4L2_CTRL_TYPE_MENU) {
2642 if (ctrl->qmenu[i] == NULL || ctrl->qmenu[i][0] == '\0')
2643 return -EINVAL;
2644 strlcpy(qm->name, ctrl->qmenu[i], sizeof(qm->name));
2645 } else {
2646 qm->value = ctrl->qmenu_int[i];
2647 }
2648 return 0;
2649 }
2650 EXPORT_SYMBOL(v4l2_querymenu);
2651
2652
2653 /* Some general notes on the atomic requirements of VIDIOC_G/TRY/S_EXT_CTRLS:
2654
2655 It is not a fully atomic operation, just best-effort only. After all, if
2656 multiple controls have to be set through multiple i2c writes (for example)
2657 then some initial writes may succeed while others fail. Thus leaving the
2658 system in an inconsistent state. The question is how much effort you are
2659 willing to spend on trying to make something atomic that really isn't.
2660
2661 From the point of view of an application the main requirement is that
2662 when you call VIDIOC_S_EXT_CTRLS and some values are invalid then an
2663 error should be returned without actually affecting any controls.
2664
2665 If all the values are correct, then it is acceptable to just give up
2666 in case of low-level errors.
2667
2668 It is important though that the application can tell when only a partial
2669 configuration was done. The way we do that is through the error_idx field
2670 of struct v4l2_ext_controls: if that is equal to the count field then no
2671 controls were affected. Otherwise all controls before that index were
2672 successful in performing their 'get' or 'set' operation, the control at
2673 the given index failed, and you don't know what happened with the controls
2674 after the failed one. Since if they were part of a control cluster they
2675 could have been successfully processed (if a cluster member was encountered
2676 at index < error_idx), they could have failed (if a cluster member was at
2677 error_idx), or they may not have been processed yet (if the first cluster
2678 member appeared after error_idx).
2679
2680 It is all fairly theoretical, though. In practice all you can do is to
2681 bail out. If error_idx == count, then it is an application bug. If
2682 error_idx < count then it is only an application bug if the error code was
2683 EBUSY. That usually means that something started streaming just when you
2684 tried to set the controls. In all other cases it is a driver/hardware
2685 problem and all you can do is to retry or bail out.
2686
2687 Note that these rules do not apply to VIDIOC_TRY_EXT_CTRLS: since that
2688 never modifies controls the error_idx is just set to whatever control
2689 has an invalid value.
2690 */
2691
2692 /* Prepare for the extended g/s/try functions.
2693 Find the controls in the control array and do some basic checks. */
2694 static int prepare_ext_ctrls(struct v4l2_ctrl_handler *hdl,
2695 struct v4l2_ext_controls *cs,
2696 struct v4l2_ctrl_helper *helpers,
2697 bool get)
2698 {
2699 struct v4l2_ctrl_helper *h;
2700 bool have_clusters = false;
2701 u32 i;
2702
2703 for (i = 0, h = helpers; i < cs->count; i++, h++) {
2704 struct v4l2_ext_control *c = &cs->controls[i];
2705 struct v4l2_ctrl_ref *ref;
2706 struct v4l2_ctrl *ctrl;
2707 u32 id = c->id & V4L2_CTRL_ID_MASK;
2708
2709 cs->error_idx = i;
2710
2711 if (cs->which &&
2712 cs->which != V4L2_CTRL_WHICH_DEF_VAL &&
2713 V4L2_CTRL_ID2WHICH(id) != cs->which)
2714 return -EINVAL;
2715
2716 /* Old-style private controls are not allowed for
2717 extended controls */
2718 if (id >= V4L2_CID_PRIVATE_BASE)
2719 return -EINVAL;
2720 ref = find_ref_lock(hdl, id);
2721 if (ref == NULL)
2722 return -EINVAL;
2723 ctrl = ref->ctrl;
2724 if (ctrl->flags & V4L2_CTRL_FLAG_DISABLED)
2725 return -EINVAL;
2726
2727 if (ctrl->cluster[0]->ncontrols > 1)
2728 have_clusters = true;
2729 if (ctrl->cluster[0] != ctrl)
2730 ref = find_ref_lock(hdl, ctrl->cluster[0]->id);
2731 if (ctrl->is_ptr && !ctrl->is_string) {
2732 unsigned tot_size = ctrl->elems * ctrl->elem_size;
2733
2734 if (c->size < tot_size) {
2735 if (get) {
2736 c->size = tot_size;
2737 return -ENOSPC;
2738 }
2739 return -EFAULT;
2740 }
2741 c->size = tot_size;
2742 }
2743 /* Store the ref to the master control of the cluster */
2744 h->mref = ref;
2745 h->ctrl = ctrl;
2746 /* Initially set next to 0, meaning that there is no other
2747 control in this helper array belonging to the same
2748 cluster */
2749 h->next = 0;
2750 }
2751
2752 /* We are done if there were no controls that belong to a multi-
2753 control cluster. */
2754 if (!have_clusters)
2755 return 0;
2756
2757 /* The code below figures out in O(n) time which controls in the list
2758 belong to the same cluster. */
2759
2760 /* This has to be done with the handler lock taken. */
2761 mutex_lock(hdl->lock);
2762
2763 /* First zero the helper field in the master control references */
2764 for (i = 0; i < cs->count; i++)
2765 helpers[i].mref->helper = NULL;
2766 for (i = 0, h = helpers; i < cs->count; i++, h++) {
2767 struct v4l2_ctrl_ref *mref = h->mref;
2768
2769 /* If the mref->helper is set, then it points to an earlier
2770 helper that belongs to the same cluster. */
2771 if (mref->helper) {
2772 /* Set the next field of mref->helper to the current
2773 index: this means that that earlier helper now
2774 points to the next helper in the same cluster. */
2775 mref->helper->next = i;
2776 /* mref should be set only for the first helper in the
2777 cluster, clear the others. */
2778 h->mref = NULL;
2779 }
2780 /* Point the mref helper to the current helper struct. */
2781 mref->helper = h;
2782 }
2783 mutex_unlock(hdl->lock);
2784 return 0;
2785 }
2786
2787 /* Handles the corner case where cs->count == 0. It checks whether the
2788 specified control class exists. If that class ID is 0, then it checks
2789 whether there are any controls at all. */
2790 static int class_check(struct v4l2_ctrl_handler *hdl, u32 which)
2791 {
2792 if (which == 0 || which == V4L2_CTRL_WHICH_DEF_VAL)
2793 return list_empty(&hdl->ctrl_refs) ? -EINVAL : 0;
2794 return find_ref_lock(hdl, which | 1) ? 0 : -EINVAL;
2795 }
2796
2797
2798
2799 /* Get extended controls. Allocates the helpers array if needed. */
2800 int v4l2_g_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *cs)
2801 {
2802 struct v4l2_ctrl_helper helper[4];
2803 struct v4l2_ctrl_helper *helpers = helper;
2804 int ret;
2805 int i, j;
2806 bool def_value;
2807
2808 def_value = (cs->which == V4L2_CTRL_WHICH_DEF_VAL);
2809
2810 cs->error_idx = cs->count;
2811 cs->which = V4L2_CTRL_ID2WHICH(cs->which);
2812
2813 if (hdl == NULL)
2814 return -EINVAL;
2815
2816 if (cs->count == 0)
2817 return class_check(hdl, cs->which);
2818
2819 if (cs->count > ARRAY_SIZE(helper)) {
2820 helpers = kmalloc_array(cs->count, sizeof(helper[0]),
2821 GFP_KERNEL);
2822 if (helpers == NULL)
2823 return -ENOMEM;
2824 }
2825
2826 ret = prepare_ext_ctrls(hdl, cs, helpers, true);
2827 cs->error_idx = cs->count;
2828
2829 for (i = 0; !ret && i < cs->count; i++)
2830 if (helpers[i].ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY)
2831 ret = -EACCES;
2832
2833 for (i = 0; !ret && i < cs->count; i++) {
2834 int (*ctrl_to_user)(struct v4l2_ext_control *c,
2835 struct v4l2_ctrl *ctrl);
2836 struct v4l2_ctrl *master;
2837
2838 ctrl_to_user = def_value ? def_to_user : cur_to_user;
2839
2840 if (helpers[i].mref == NULL)
2841 continue;
2842
2843 master = helpers[i].mref->ctrl;
2844 cs->error_idx = i;
2845
2846 v4l2_ctrl_lock(master);
2847
2848 /* g_volatile_ctrl will update the new control values */
2849 if (!def_value &&
2850 ((master->flags & V4L2_CTRL_FLAG_VOLATILE) ||
2851 (master->has_volatiles && !is_cur_manual(master)))) {
2852 for (j = 0; j < master->ncontrols; j++)
2853 cur_to_new(master->cluster[j]);
2854 ret = call_op(master, g_volatile_ctrl);
2855 ctrl_to_user = new_to_user;
2856 }
2857 /* If OK, then copy the current (for non-volatile controls)
2858 or the new (for volatile controls) control values to the
2859 caller */
2860 if (!ret) {
2861 u32 idx = i;
2862
2863 do {
2864 ret = ctrl_to_user(cs->controls + idx,
2865 helpers[idx].ctrl);
2866 idx = helpers[idx].next;
2867 } while (!ret && idx);
2868 }
2869 v4l2_ctrl_unlock(master);
2870 }
2871
2872 if (cs->count > ARRAY_SIZE(helper))
2873 kfree(helpers);
2874 return ret;
2875 }
2876 EXPORT_SYMBOL(v4l2_g_ext_ctrls);
2877
2878 /* Helper function to get a single control */
2879 static int get_ctrl(struct v4l2_ctrl *ctrl, struct v4l2_ext_control *c)
2880 {
2881 struct v4l2_ctrl *master = ctrl->cluster[0];
2882 int ret = 0;
2883 int i;
2884
2885 /* Compound controls are not supported. The new_to_user() and
2886 * cur_to_user() calls below would need to be modified not to access
2887 * userspace memory when called from get_ctrl().
2888 */
2889 if (!ctrl->is_int && ctrl->type != V4L2_CTRL_TYPE_INTEGER64)
2890 return -EINVAL;
2891
2892 if (ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY)
2893 return -EACCES;
2894
2895 v4l2_ctrl_lock(master);
2896 /* g_volatile_ctrl will update the current control values */
2897 if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE) {
2898 for (i = 0; i < master->ncontrols; i++)
2899 cur_to_new(master->cluster[i]);
2900 ret = call_op(master, g_volatile_ctrl);
2901 new_to_user(c, ctrl);
2902 } else {
2903 cur_to_user(c, ctrl);
2904 }
2905 v4l2_ctrl_unlock(master);
2906 return ret;
2907 }
2908
2909 int v4l2_g_ctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_control *control)
2910 {
2911 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, control->id);
2912 struct v4l2_ext_control c;
2913 int ret;
2914
2915 if (ctrl == NULL || !ctrl->is_int)
2916 return -EINVAL;
2917 ret = get_ctrl(ctrl, &c);
2918 control->value = c.value;
2919 return ret;
2920 }
2921 EXPORT_SYMBOL(v4l2_g_ctrl);
2922
2923 s32 v4l2_ctrl_g_ctrl(struct v4l2_ctrl *ctrl)
2924 {
2925 struct v4l2_ext_control c;
2926
2927 /* It's a driver bug if this happens. */
2928 WARN_ON(!ctrl->is_int);
2929 c.value = 0;
2930 get_ctrl(ctrl, &c);
2931 return c.value;
2932 }
2933 EXPORT_SYMBOL(v4l2_ctrl_g_ctrl);
2934
2935 s64 v4l2_ctrl_g_ctrl_int64(struct v4l2_ctrl *ctrl)
2936 {
2937 struct v4l2_ext_control c;
2938
2939 /* It's a driver bug if this happens. */
2940 WARN_ON(ctrl->is_ptr || ctrl->type != V4L2_CTRL_TYPE_INTEGER64);
2941 c.value64 = 0;
2942 get_ctrl(ctrl, &c);
2943 return c.value64;
2944 }
2945 EXPORT_SYMBOL(v4l2_ctrl_g_ctrl_int64);
2946
2947
2948 /* Core function that calls try/s_ctrl and ensures that the new value is
2949 copied to the current value on a set.
2950 Must be called with ctrl->handler->lock held. */
2951 static int try_or_set_cluster(struct v4l2_fh *fh, struct v4l2_ctrl *master,
2952 bool set, u32 ch_flags)
2953 {
2954 bool update_flag;
2955 int ret;
2956 int i;
2957
2958 /* Go through the cluster and either validate the new value or
2959 (if no new value was set), copy the current value to the new
2960 value, ensuring a consistent view for the control ops when
2961 called. */
2962 for (i = 0; i < master->ncontrols; i++) {
2963 struct v4l2_ctrl *ctrl = master->cluster[i];
2964
2965 if (ctrl == NULL)
2966 continue;
2967
2968 if (!ctrl->is_new) {
2969 cur_to_new(ctrl);
2970 continue;
2971 }
2972 /* Check again: it may have changed since the
2973 previous check in try_or_set_ext_ctrls(). */
2974 if (set && (ctrl->flags & V4L2_CTRL_FLAG_GRABBED))
2975 return -EBUSY;
2976 }
2977
2978 ret = call_op(master, try_ctrl);
2979
2980 /* Don't set if there is no change */
2981 if (ret || !set || !cluster_changed(master))
2982 return ret;
2983 ret = call_op(master, s_ctrl);
2984 if (ret)
2985 return ret;
2986
2987 /* If OK, then make the new values permanent. */
2988 update_flag = is_cur_manual(master) != is_new_manual(master);
2989 for (i = 0; i < master->ncontrols; i++)
2990 new_to_cur(fh, master->cluster[i], ch_flags |
2991 ((update_flag && i > 0) ? V4L2_EVENT_CTRL_CH_FLAGS : 0));
2992 return 0;
2993 }
2994
2995 /* Validate controls. */
2996 static int validate_ctrls(struct v4l2_ext_controls *cs,
2997 struct v4l2_ctrl_helper *helpers, bool set)
2998 {
2999 unsigned i;
3000 int ret = 0;
3001
3002 cs->error_idx = cs->count;
3003 for (i = 0; i < cs->count; i++) {
3004 struct v4l2_ctrl *ctrl = helpers[i].ctrl;
3005 union v4l2_ctrl_ptr p_new;
3006
3007 cs->error_idx = i;
3008
3009 if (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY)
3010 return -EACCES;
3011 /* This test is also done in try_set_control_cluster() which
3012 is called in atomic context, so that has the final say,
3013 but it makes sense to do an up-front check as well. Once
3014 an error occurs in try_set_control_cluster() some other
3015 controls may have been set already and we want to do a
3016 best-effort to avoid that. */
3017 if (set && (ctrl->flags & V4L2_CTRL_FLAG_GRABBED))
3018 return -EBUSY;
3019 /*
3020 * Skip validation for now if the payload needs to be copied
3021 * from userspace into kernelspace. We'll validate those later.
3022 */
3023 if (ctrl->is_ptr)
3024 continue;
3025 if (ctrl->type == V4L2_CTRL_TYPE_INTEGER64)
3026 p_new.p_s64 = &cs->controls[i].value64;
3027 else
3028 p_new.p_s32 = &cs->controls[i].value;
3029 ret = validate_new(ctrl, p_new);
3030 if (ret)
3031 return ret;
3032 }
3033 return 0;
3034 }
3035
3036 /* Obtain the current volatile values of an autocluster and mark them
3037 as new. */
3038 static void update_from_auto_cluster(struct v4l2_ctrl *master)
3039 {
3040 int i;
3041
3042 for (i = 1; i < master->ncontrols; i++)
3043 cur_to_new(master->cluster[i]);
3044 if (!call_op(master, g_volatile_ctrl))
3045 for (i = 1; i < master->ncontrols; i++)
3046 if (master->cluster[i])
3047 master->cluster[i]->is_new = 1;
3048 }
3049
3050 /* Try or try-and-set controls */
3051 static int try_set_ext_ctrls(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
3052 struct v4l2_ext_controls *cs,
3053 bool set)
3054 {
3055 struct v4l2_ctrl_helper helper[4];
3056 struct v4l2_ctrl_helper *helpers = helper;
3057 unsigned i, j;
3058 int ret;
3059
3060 cs->error_idx = cs->count;
3061
3062 /* Default value cannot be changed */
3063 if (cs->which == V4L2_CTRL_WHICH_DEF_VAL)
3064 return -EINVAL;
3065
3066 cs->which = V4L2_CTRL_ID2WHICH(cs->which);
3067
3068 if (hdl == NULL)
3069 return -EINVAL;
3070
3071 if (cs->count == 0)
3072 return class_check(hdl, cs->which);
3073
3074 if (cs->count > ARRAY_SIZE(helper)) {
3075 helpers = kmalloc_array(cs->count, sizeof(helper[0]),
3076 GFP_KERNEL);
3077 if (!helpers)
3078 return -ENOMEM;
3079 }
3080 ret = prepare_ext_ctrls(hdl, cs, helpers, false);
3081 if (!ret)
3082 ret = validate_ctrls(cs, helpers, set);
3083 if (ret && set)
3084 cs->error_idx = cs->count;
3085 for (i = 0; !ret && i < cs->count; i++) {
3086 struct v4l2_ctrl *master;
3087 u32 idx = i;
3088
3089 if (helpers[i].mref == NULL)
3090 continue;
3091
3092 cs->error_idx = i;
3093 master = helpers[i].mref->ctrl;
3094 v4l2_ctrl_lock(master);
3095
3096 /* Reset the 'is_new' flags of the cluster */
3097 for (j = 0; j < master->ncontrols; j++)
3098 if (master->cluster[j])
3099 master->cluster[j]->is_new = 0;
3100
3101 /* For volatile autoclusters that are currently in auto mode
3102 we need to discover if it will be set to manual mode.
3103 If so, then we have to copy the current volatile values
3104 first since those will become the new manual values (which
3105 may be overwritten by explicit new values from this set
3106 of controls). */
3107 if (master->is_auto && master->has_volatiles &&
3108 !is_cur_manual(master)) {
3109 /* Pick an initial non-manual value */
3110 s32 new_auto_val = master->manual_mode_value + 1;
3111 u32 tmp_idx = idx;
3112
3113 do {
3114 /* Check if the auto control is part of the
3115 list, and remember the new value. */
3116 if (helpers[tmp_idx].ctrl == master)
3117 new_auto_val = cs->controls[tmp_idx].value;
3118 tmp_idx = helpers[tmp_idx].next;
3119 } while (tmp_idx);
3120 /* If the new value == the manual value, then copy
3121 the current volatile values. */
3122 if (new_auto_val == master->manual_mode_value)
3123 update_from_auto_cluster(master);
3124 }
3125
3126 /* Copy the new caller-supplied control values.
3127 user_to_new() sets 'is_new' to 1. */
3128 do {
3129 struct v4l2_ctrl *ctrl = helpers[idx].ctrl;
3130
3131 ret = user_to_new(cs->controls + idx, ctrl);
3132 if (!ret && ctrl->is_ptr)
3133 ret = validate_new(ctrl, ctrl->p_new);
3134 idx = helpers[idx].next;
3135 } while (!ret && idx);
3136
3137 if (!ret)
3138 ret = try_or_set_cluster(fh, master, set, 0);
3139
3140 /* Copy the new values back to userspace. */
3141 if (!ret) {
3142 idx = i;
3143 do {
3144 ret = new_to_user(cs->controls + idx,
3145 helpers[idx].ctrl);
3146 idx = helpers[idx].next;
3147 } while (!ret && idx);
3148 }
3149 v4l2_ctrl_unlock(master);
3150 }
3151
3152 if (cs->count > ARRAY_SIZE(helper))
3153 kfree(helpers);
3154 return ret;
3155 }
3156
3157 int v4l2_try_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *cs)
3158 {
3159 return try_set_ext_ctrls(NULL, hdl, cs, false);
3160 }
3161 EXPORT_SYMBOL(v4l2_try_ext_ctrls);
3162
3163 int v4l2_s_ext_ctrls(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
3164 struct v4l2_ext_controls *cs)
3165 {
3166 return try_set_ext_ctrls(fh, hdl, cs, true);
3167 }
3168 EXPORT_SYMBOL(v4l2_s_ext_ctrls);
3169
3170 /* Helper function for VIDIOC_S_CTRL compatibility */
3171 static int set_ctrl(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, u32 ch_flags)
3172 {
3173 struct v4l2_ctrl *master = ctrl->cluster[0];
3174 int ret;
3175 int i;
3176
3177 /* Reset the 'is_new' flags of the cluster */
3178 for (i = 0; i < master->ncontrols; i++)
3179 if (master->cluster[i])
3180 master->cluster[i]->is_new = 0;
3181
3182 ret = validate_new(ctrl, ctrl->p_new);
3183 if (ret)
3184 return ret;
3185
3186 /* For autoclusters with volatiles that are switched from auto to
3187 manual mode we have to update the current volatile values since
3188 those will become the initial manual values after such a switch. */
3189 if (master->is_auto && master->has_volatiles && ctrl == master &&
3190 !is_cur_manual(master) && ctrl->val == master->manual_mode_value)
3191 update_from_auto_cluster(master);
3192
3193 ctrl->is_new = 1;
3194 return try_or_set_cluster(fh, master, true, ch_flags);
3195 }
3196
3197 /* Helper function for VIDIOC_S_CTRL compatibility */
3198 static int set_ctrl_lock(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl,
3199 struct v4l2_ext_control *c)
3200 {
3201 int ret;
3202
3203 v4l2_ctrl_lock(ctrl);
3204 user_to_new(c, ctrl);
3205 ret = set_ctrl(fh, ctrl, 0);
3206 if (!ret)
3207 cur_to_user(c, ctrl);
3208 v4l2_ctrl_unlock(ctrl);
3209 return ret;
3210 }
3211
3212 int v4l2_s_ctrl(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
3213 struct v4l2_control *control)
3214 {
3215 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, control->id);
3216 struct v4l2_ext_control c = { control->id };
3217 int ret;
3218
3219 if (ctrl == NULL || !ctrl->is_int)
3220 return -EINVAL;
3221
3222 if (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY)
3223 return -EACCES;
3224
3225 c.value = control->value;
3226 ret = set_ctrl_lock(fh, ctrl, &c);
3227 control->value = c.value;
3228 return ret;
3229 }
3230 EXPORT_SYMBOL(v4l2_s_ctrl);
3231
3232 int __v4l2_ctrl_s_ctrl(struct v4l2_ctrl *ctrl, s32 val)
3233 {
3234 lockdep_assert_held(ctrl->handler->lock);
3235
3236 /* It's a driver bug if this happens. */
3237 WARN_ON(!ctrl->is_int);
3238 ctrl->val = val;
3239 return set_ctrl(NULL, ctrl, 0);
3240 }
3241 EXPORT_SYMBOL(__v4l2_ctrl_s_ctrl);
3242
3243 int __v4l2_ctrl_s_ctrl_int64(struct v4l2_ctrl *ctrl, s64 val)
3244 {
3245 lockdep_assert_held(ctrl->handler->lock);
3246
3247 /* It's a driver bug if this happens. */
3248 WARN_ON(ctrl->is_ptr || ctrl->type != V4L2_CTRL_TYPE_INTEGER64);
3249 *ctrl->p_new.p_s64 = val;
3250 return set_ctrl(NULL, ctrl, 0);
3251 }
3252 EXPORT_SYMBOL(__v4l2_ctrl_s_ctrl_int64);
3253
3254 int __v4l2_ctrl_s_ctrl_string(struct v4l2_ctrl *ctrl, const char *s)
3255 {
3256 lockdep_assert_held(ctrl->handler->lock);
3257
3258 /* It's a driver bug if this happens. */
3259 WARN_ON(ctrl->type != V4L2_CTRL_TYPE_STRING);
3260 strlcpy(ctrl->p_new.p_char, s, ctrl->maximum + 1);
3261 return set_ctrl(NULL, ctrl, 0);
3262 }
3263 EXPORT_SYMBOL(__v4l2_ctrl_s_ctrl_string);
3264
3265 void v4l2_ctrl_notify(struct v4l2_ctrl *ctrl, v4l2_ctrl_notify_fnc notify, void *priv)
3266 {
3267 if (ctrl == NULL)
3268 return;
3269 if (notify == NULL) {
3270 ctrl->call_notify = 0;
3271 return;
3272 }
3273 if (WARN_ON(ctrl->handler->notify && ctrl->handler->notify != notify))
3274 return;
3275 ctrl->handler->notify = notify;
3276 ctrl->handler->notify_priv = priv;
3277 ctrl->call_notify = 1;
3278 }
3279 EXPORT_SYMBOL(v4l2_ctrl_notify);
3280
3281 int __v4l2_ctrl_modify_range(struct v4l2_ctrl *ctrl,
3282 s64 min, s64 max, u64 step, s64 def)
3283 {
3284 bool value_changed;
3285 bool range_changed = false;
3286 int ret;
3287
3288 lockdep_assert_held(ctrl->handler->lock);
3289
3290 switch (ctrl->type) {
3291 case V4L2_CTRL_TYPE_INTEGER:
3292 case V4L2_CTRL_TYPE_INTEGER64:
3293 case V4L2_CTRL_TYPE_BOOLEAN:
3294 case V4L2_CTRL_TYPE_MENU:
3295 case V4L2_CTRL_TYPE_INTEGER_MENU:
3296 case V4L2_CTRL_TYPE_BITMASK:
3297 case V4L2_CTRL_TYPE_U8:
3298 case V4L2_CTRL_TYPE_U16:
3299 case V4L2_CTRL_TYPE_U32:
3300 if (ctrl->is_array)
3301 return -EINVAL;
3302 ret = check_range(ctrl->type, min, max, step, def);
3303 if (ret)
3304 return ret;
3305 break;
3306 default:
3307 return -EINVAL;
3308 }
3309 if ((ctrl->minimum != min) || (ctrl->maximum != max) ||
3310 (ctrl->step != step) || ctrl->default_value != def) {
3311 range_changed = true;
3312 ctrl->minimum = min;
3313 ctrl->maximum = max;
3314 ctrl->step = step;
3315 ctrl->default_value = def;
3316 }
3317 cur_to_new(ctrl);
3318 if (validate_new(ctrl, ctrl->p_new)) {
3319 if (ctrl->type == V4L2_CTRL_TYPE_INTEGER64)
3320 *ctrl->p_new.p_s64 = def;
3321 else
3322 *ctrl->p_new.p_s32 = def;
3323 }
3324
3325 if (ctrl->type == V4L2_CTRL_TYPE_INTEGER64)
3326 value_changed = *ctrl->p_new.p_s64 != *ctrl->p_cur.p_s64;
3327 else
3328 value_changed = *ctrl->p_new.p_s32 != *ctrl->p_cur.p_s32;
3329 if (value_changed)
3330 ret = set_ctrl(NULL, ctrl, V4L2_EVENT_CTRL_CH_RANGE);
3331 else if (range_changed)
3332 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_RANGE);
3333 return ret;
3334 }
3335 EXPORT_SYMBOL(__v4l2_ctrl_modify_range);
3336
3337 static int v4l2_ctrl_add_event(struct v4l2_subscribed_event *sev, unsigned elems)
3338 {
3339 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(sev->fh->ctrl_handler, sev->id);
3340
3341 if (ctrl == NULL)
3342 return -EINVAL;
3343
3344 v4l2_ctrl_lock(ctrl);
3345 list_add_tail(&sev->node, &ctrl->ev_subs);
3346 if (ctrl->type != V4L2_CTRL_TYPE_CTRL_CLASS &&
3347 (sev->flags & V4L2_EVENT_SUB_FL_SEND_INITIAL)) {
3348 struct v4l2_event ev;
3349 u32 changes = V4L2_EVENT_CTRL_CH_FLAGS;
3350
3351 if (!(ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY))
3352 changes |= V4L2_EVENT_CTRL_CH_VALUE;
3353 fill_event(&ev, ctrl, changes);
3354 /* Mark the queue as active, allowing this initial
3355 event to be accepted. */
3356 sev->elems = elems;
3357 v4l2_event_queue_fh(sev->fh, &ev);
3358 }
3359 v4l2_ctrl_unlock(ctrl);
3360 return 0;
3361 }
3362
3363 static void v4l2_ctrl_del_event(struct v4l2_subscribed_event *sev)
3364 {
3365 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(sev->fh->ctrl_handler, sev->id);
3366
3367 v4l2_ctrl_lock(ctrl);
3368 list_del(&sev->node);
3369 v4l2_ctrl_unlock(ctrl);
3370 }
3371
3372 void v4l2_ctrl_replace(struct v4l2_event *old, const struct v4l2_event *new)
3373 {
3374 u32 old_changes = old->u.ctrl.changes;
3375
3376 old->u.ctrl = new->u.ctrl;
3377 old->u.ctrl.changes |= old_changes;
3378 }
3379 EXPORT_SYMBOL(v4l2_ctrl_replace);
3380
3381 void v4l2_ctrl_merge(const struct v4l2_event *old, struct v4l2_event *new)
3382 {
3383 new->u.ctrl.changes |= old->u.ctrl.changes;
3384 }
3385 EXPORT_SYMBOL(v4l2_ctrl_merge);
3386
3387 const struct v4l2_subscribed_event_ops v4l2_ctrl_sub_ev_ops = {
3388 .add = v4l2_ctrl_add_event,
3389 .del = v4l2_ctrl_del_event,
3390 .replace = v4l2_ctrl_replace,
3391 .merge = v4l2_ctrl_merge,
3392 };
3393 EXPORT_SYMBOL(v4l2_ctrl_sub_ev_ops);
3394
3395 int v4l2_ctrl_log_status(struct file *file, void *fh)
3396 {
3397 struct video_device *vfd = video_devdata(file);
3398 struct v4l2_fh *vfh = file->private_data;
3399
3400 if (test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags) && vfd->v4l2_dev)
3401 v4l2_ctrl_handler_log_status(vfh->ctrl_handler,
3402 vfd->v4l2_dev->name);
3403 return 0;
3404 }
3405 EXPORT_SYMBOL(v4l2_ctrl_log_status);
3406
3407 int v4l2_ctrl_subscribe_event(struct v4l2_fh *fh,
3408 const struct v4l2_event_subscription *sub)
3409 {
3410 if (sub->type == V4L2_EVENT_CTRL)
3411 return v4l2_event_subscribe(fh, sub, 0, &v4l2_ctrl_sub_ev_ops);
3412 return -EINVAL;
3413 }
3414 EXPORT_SYMBOL(v4l2_ctrl_subscribe_event);
3415
3416 int v4l2_ctrl_subdev_subscribe_event(struct v4l2_subdev *sd, struct v4l2_fh *fh,
3417 struct v4l2_event_subscription *sub)
3418 {
3419 if (!sd->ctrl_handler)
3420 return -EINVAL;
3421 return v4l2_ctrl_subscribe_event(fh, sub);
3422 }
3423 EXPORT_SYMBOL(v4l2_ctrl_subdev_subscribe_event);
3424
3425 unsigned int v4l2_ctrl_poll(struct file *file, struct poll_table_struct *wait)
3426 {
3427 struct v4l2_fh *fh = file->private_data;
3428
3429 if (v4l2_event_pending(fh))
3430 return POLLPRI;
3431 poll_wait(file, &fh->wait, wait);
3432 return 0;
3433 }
3434 EXPORT_SYMBOL(v4l2_ctrl_poll);
Linux kernel - Deliverables
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