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Merge branches 'fixes' and 'ioremap' into for-linus
[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 detect_md_mode[] = {
466 "Disabled",
467 "Global",
468 "Threshold Grid",
469 "Region Grid",
470 NULL,
471 };
472
473
474 switch (id) {
475 case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ:
476 return mpeg_audio_sampling_freq;
477 case V4L2_CID_MPEG_AUDIO_ENCODING:
478 return mpeg_audio_encoding;
479 case V4L2_CID_MPEG_AUDIO_L1_BITRATE:
480 return mpeg_audio_l1_bitrate;
481 case V4L2_CID_MPEG_AUDIO_L2_BITRATE:
482 return mpeg_audio_l2_bitrate;
483 case V4L2_CID_MPEG_AUDIO_L3_BITRATE:
484 return mpeg_audio_l3_bitrate;
485 case V4L2_CID_MPEG_AUDIO_AC3_BITRATE:
486 return mpeg_audio_ac3_bitrate;
487 case V4L2_CID_MPEG_AUDIO_MODE:
488 return mpeg_audio_mode;
489 case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION:
490 return mpeg_audio_mode_extension;
491 case V4L2_CID_MPEG_AUDIO_EMPHASIS:
492 return mpeg_audio_emphasis;
493 case V4L2_CID_MPEG_AUDIO_CRC:
494 return mpeg_audio_crc;
495 case V4L2_CID_MPEG_AUDIO_DEC_PLAYBACK:
496 case V4L2_CID_MPEG_AUDIO_DEC_MULTILINGUAL_PLAYBACK:
497 return mpeg_audio_dec_playback;
498 case V4L2_CID_MPEG_VIDEO_ENCODING:
499 return mpeg_video_encoding;
500 case V4L2_CID_MPEG_VIDEO_ASPECT:
501 return mpeg_video_aspect;
502 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
503 return mpeg_video_bitrate_mode;
504 case V4L2_CID_MPEG_STREAM_TYPE:
505 return mpeg_stream_type;
506 case V4L2_CID_MPEG_STREAM_VBI_FMT:
507 return mpeg_stream_vbi_fmt;
508 case V4L2_CID_POWER_LINE_FREQUENCY:
509 return camera_power_line_frequency;
510 case V4L2_CID_EXPOSURE_AUTO:
511 return camera_exposure_auto;
512 case V4L2_CID_EXPOSURE_METERING:
513 return camera_exposure_metering;
514 case V4L2_CID_AUTO_FOCUS_RANGE:
515 return camera_auto_focus_range;
516 case V4L2_CID_COLORFX:
517 return colorfx;
518 case V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE:
519 return auto_n_preset_white_balance;
520 case V4L2_CID_ISO_SENSITIVITY_AUTO:
521 return camera_iso_sensitivity_auto;
522 case V4L2_CID_SCENE_MODE:
523 return scene_mode;
524 case V4L2_CID_TUNE_PREEMPHASIS:
525 return tune_emphasis;
526 case V4L2_CID_TUNE_DEEMPHASIS:
527 return tune_emphasis;
528 case V4L2_CID_FLASH_LED_MODE:
529 return flash_led_mode;
530 case V4L2_CID_FLASH_STROBE_SOURCE:
531 return flash_strobe_source;
532 case V4L2_CID_MPEG_VIDEO_HEADER_MODE:
533 return header_mode;
534 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE:
535 return multi_slice;
536 case V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE:
537 return entropy_mode;
538 case V4L2_CID_MPEG_VIDEO_H264_LEVEL:
539 return mpeg_h264_level;
540 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE:
541 return h264_loop_filter;
542 case V4L2_CID_MPEG_VIDEO_H264_PROFILE:
543 return h264_profile;
544 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC:
545 return vui_sar_idc;
546 case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE:
547 return h264_fp_arrangement_type;
548 case V4L2_CID_MPEG_VIDEO_H264_FMO_MAP_TYPE:
549 return h264_fmo_map_type;
550 case V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL:
551 return mpeg_mpeg4_level;
552 case V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE:
553 return mpeg4_profile;
554 case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_SEL:
555 return vpx_golden_frame_sel;
556 case V4L2_CID_JPEG_CHROMA_SUBSAMPLING:
557 return jpeg_chroma_subsampling;
558 case V4L2_CID_DV_TX_MODE:
559 return dv_tx_mode;
560 case V4L2_CID_DV_TX_RGB_RANGE:
561 case V4L2_CID_DV_RX_RGB_RANGE:
562 return dv_rgb_range;
563 case V4L2_CID_DETECT_MD_MODE:
564 return detect_md_mode;
565
566 default:
567 return NULL;
568 }
569 }
570 EXPORT_SYMBOL(v4l2_ctrl_get_menu);
571
572 #define __v4l2_qmenu_int_len(arr, len) ({ *(len) = ARRAY_SIZE(arr); arr; })
573 /*
574 * Returns NULL or an s64 type array containing the menu for given
575 * control ID. The total number of the menu items is returned in @len.
576 */
577 const s64 *v4l2_ctrl_get_int_menu(u32 id, u32 *len)
578 {
579 static const s64 qmenu_int_vpx_num_partitions[] = {
580 1, 2, 4, 8,
581 };
582
583 static const s64 qmenu_int_vpx_num_ref_frames[] = {
584 1, 2, 3,
585 };
586
587 switch (id) {
588 case V4L2_CID_MPEG_VIDEO_VPX_NUM_PARTITIONS:
589 return __v4l2_qmenu_int_len(qmenu_int_vpx_num_partitions, len);
590 case V4L2_CID_MPEG_VIDEO_VPX_NUM_REF_FRAMES:
591 return __v4l2_qmenu_int_len(qmenu_int_vpx_num_ref_frames, len);
592 default:
593 *len = 0;
594 return NULL;
595 }
596 }
597 EXPORT_SYMBOL(v4l2_ctrl_get_int_menu);
598
599 /* Return the control name. */
600 const char *v4l2_ctrl_get_name(u32 id)
601 {
602 switch (id) {
603 /* USER controls */
604 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
605 case V4L2_CID_USER_CLASS: return "User Controls";
606 case V4L2_CID_BRIGHTNESS: return "Brightness";
607 case V4L2_CID_CONTRAST: return "Contrast";
608 case V4L2_CID_SATURATION: return "Saturation";
609 case V4L2_CID_HUE: return "Hue";
610 case V4L2_CID_AUDIO_VOLUME: return "Volume";
611 case V4L2_CID_AUDIO_BALANCE: return "Balance";
612 case V4L2_CID_AUDIO_BASS: return "Bass";
613 case V4L2_CID_AUDIO_TREBLE: return "Treble";
614 case V4L2_CID_AUDIO_MUTE: return "Mute";
615 case V4L2_CID_AUDIO_LOUDNESS: return "Loudness";
616 case V4L2_CID_BLACK_LEVEL: return "Black Level";
617 case V4L2_CID_AUTO_WHITE_BALANCE: return "White Balance, Automatic";
618 case V4L2_CID_DO_WHITE_BALANCE: return "Do White Balance";
619 case V4L2_CID_RED_BALANCE: return "Red Balance";
620 case V4L2_CID_BLUE_BALANCE: return "Blue Balance";
621 case V4L2_CID_GAMMA: return "Gamma";
622 case V4L2_CID_EXPOSURE: return "Exposure";
623 case V4L2_CID_AUTOGAIN: return "Gain, Automatic";
624 case V4L2_CID_GAIN: return "Gain";
625 case V4L2_CID_HFLIP: return "Horizontal Flip";
626 case V4L2_CID_VFLIP: return "Vertical Flip";
627 case V4L2_CID_POWER_LINE_FREQUENCY: return "Power Line Frequency";
628 case V4L2_CID_HUE_AUTO: return "Hue, Automatic";
629 case V4L2_CID_WHITE_BALANCE_TEMPERATURE: return "White Balance Temperature";
630 case V4L2_CID_SHARPNESS: return "Sharpness";
631 case V4L2_CID_BACKLIGHT_COMPENSATION: return "Backlight Compensation";
632 case V4L2_CID_CHROMA_AGC: return "Chroma AGC";
633 case V4L2_CID_COLOR_KILLER: return "Color Killer";
634 case V4L2_CID_COLORFX: return "Color Effects";
635 case V4L2_CID_AUTOBRIGHTNESS: return "Brightness, Automatic";
636 case V4L2_CID_BAND_STOP_FILTER: return "Band-Stop Filter";
637 case V4L2_CID_ROTATE: return "Rotate";
638 case V4L2_CID_BG_COLOR: return "Background Color";
639 case V4L2_CID_CHROMA_GAIN: return "Chroma Gain";
640 case V4L2_CID_ILLUMINATORS_1: return "Illuminator 1";
641 case V4L2_CID_ILLUMINATORS_2: return "Illuminator 2";
642 case V4L2_CID_MIN_BUFFERS_FOR_CAPTURE: return "Min Number of Capture Buffers";
643 case V4L2_CID_MIN_BUFFERS_FOR_OUTPUT: return "Min Number of Output Buffers";
644 case V4L2_CID_ALPHA_COMPONENT: return "Alpha Component";
645 case V4L2_CID_COLORFX_CBCR: return "Color Effects, CbCr";
646
647 /* Codec controls */
648 /* The MPEG controls are applicable to all codec controls
649 * and the 'MPEG' part of the define is historical */
650 /* Keep the order of the 'case's the same as in videodev2.h! */
651 case V4L2_CID_MPEG_CLASS: return "Codec Controls";
652 case V4L2_CID_MPEG_STREAM_TYPE: return "Stream Type";
653 case V4L2_CID_MPEG_STREAM_PID_PMT: return "Stream PMT Program ID";
654 case V4L2_CID_MPEG_STREAM_PID_AUDIO: return "Stream Audio Program ID";
655 case V4L2_CID_MPEG_STREAM_PID_VIDEO: return "Stream Video Program ID";
656 case V4L2_CID_MPEG_STREAM_PID_PCR: return "Stream PCR Program ID";
657 case V4L2_CID_MPEG_STREAM_PES_ID_AUDIO: return "Stream PES Audio ID";
658 case V4L2_CID_MPEG_STREAM_PES_ID_VIDEO: return "Stream PES Video ID";
659 case V4L2_CID_MPEG_STREAM_VBI_FMT: return "Stream VBI Format";
660 case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ: return "Audio Sampling Frequency";
661 case V4L2_CID_MPEG_AUDIO_ENCODING: return "Audio Encoding";
662 case V4L2_CID_MPEG_AUDIO_L1_BITRATE: return "Audio Layer I Bitrate";
663 case V4L2_CID_MPEG_AUDIO_L2_BITRATE: return "Audio Layer II Bitrate";
664 case V4L2_CID_MPEG_AUDIO_L3_BITRATE: return "Audio Layer III Bitrate";
665 case V4L2_CID_MPEG_AUDIO_MODE: return "Audio Stereo Mode";
666 case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION: return "Audio Stereo Mode Extension";
667 case V4L2_CID_MPEG_AUDIO_EMPHASIS: return "Audio Emphasis";
668 case V4L2_CID_MPEG_AUDIO_CRC: return "Audio CRC";
669 case V4L2_CID_MPEG_AUDIO_MUTE: return "Audio Mute";
670 case V4L2_CID_MPEG_AUDIO_AAC_BITRATE: return "Audio AAC Bitrate";
671 case V4L2_CID_MPEG_AUDIO_AC3_BITRATE: return "Audio AC-3 Bitrate";
672 case V4L2_CID_MPEG_AUDIO_DEC_PLAYBACK: return "Audio Playback";
673 case V4L2_CID_MPEG_AUDIO_DEC_MULTILINGUAL_PLAYBACK: return "Audio Multilingual Playback";
674 case V4L2_CID_MPEG_VIDEO_ENCODING: return "Video Encoding";
675 case V4L2_CID_MPEG_VIDEO_ASPECT: return "Video Aspect";
676 case V4L2_CID_MPEG_VIDEO_B_FRAMES: return "Video B Frames";
677 case V4L2_CID_MPEG_VIDEO_GOP_SIZE: return "Video GOP Size";
678 case V4L2_CID_MPEG_VIDEO_GOP_CLOSURE: return "Video GOP Closure";
679 case V4L2_CID_MPEG_VIDEO_PULLDOWN: return "Video Pulldown";
680 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE: return "Video Bitrate Mode";
681 case V4L2_CID_MPEG_VIDEO_BITRATE: return "Video Bitrate";
682 case V4L2_CID_MPEG_VIDEO_BITRATE_PEAK: return "Video Peak Bitrate";
683 case V4L2_CID_MPEG_VIDEO_TEMPORAL_DECIMATION: return "Video Temporal Decimation";
684 case V4L2_CID_MPEG_VIDEO_MUTE: return "Video Mute";
685 case V4L2_CID_MPEG_VIDEO_MUTE_YUV: return "Video Mute YUV";
686 case V4L2_CID_MPEG_VIDEO_DECODER_SLICE_INTERFACE: return "Decoder Slice Interface";
687 case V4L2_CID_MPEG_VIDEO_DECODER_MPEG4_DEBLOCK_FILTER: return "MPEG4 Loop Filter Enable";
688 case V4L2_CID_MPEG_VIDEO_CYCLIC_INTRA_REFRESH_MB: return "Number of Intra Refresh MBs";
689 case V4L2_CID_MPEG_VIDEO_FRAME_RC_ENABLE: return "Frame Level Rate Control Enable";
690 case V4L2_CID_MPEG_VIDEO_MB_RC_ENABLE: return "H264 MB Level Rate Control";
691 case V4L2_CID_MPEG_VIDEO_HEADER_MODE: return "Sequence Header Mode";
692 case V4L2_CID_MPEG_VIDEO_MAX_REF_PIC: return "Max Number of Reference Pics";
693 case V4L2_CID_MPEG_VIDEO_H263_I_FRAME_QP: return "H263 I-Frame QP Value";
694 case V4L2_CID_MPEG_VIDEO_H263_P_FRAME_QP: return "H263 P-Frame QP Value";
695 case V4L2_CID_MPEG_VIDEO_H263_B_FRAME_QP: return "H263 B-Frame QP Value";
696 case V4L2_CID_MPEG_VIDEO_H263_MIN_QP: return "H263 Minimum QP Value";
697 case V4L2_CID_MPEG_VIDEO_H263_MAX_QP: return "H263 Maximum QP Value";
698 case V4L2_CID_MPEG_VIDEO_H264_I_FRAME_QP: return "H264 I-Frame QP Value";
699 case V4L2_CID_MPEG_VIDEO_H264_P_FRAME_QP: return "H264 P-Frame QP Value";
700 case V4L2_CID_MPEG_VIDEO_H264_B_FRAME_QP: return "H264 B-Frame QP Value";
701 case V4L2_CID_MPEG_VIDEO_H264_MAX_QP: return "H264 Maximum QP Value";
702 case V4L2_CID_MPEG_VIDEO_H264_MIN_QP: return "H264 Minimum QP Value";
703 case V4L2_CID_MPEG_VIDEO_H264_8X8_TRANSFORM: return "H264 8x8 Transform Enable";
704 case V4L2_CID_MPEG_VIDEO_H264_CPB_SIZE: return "H264 CPB Buffer Size";
705 case V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE: return "H264 Entropy Mode";
706 case V4L2_CID_MPEG_VIDEO_H264_I_PERIOD: return "H264 I-Frame Period";
707 case V4L2_CID_MPEG_VIDEO_H264_LEVEL: return "H264 Level";
708 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_ALPHA: return "H264 Loop Filter Alpha Offset";
709 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_BETA: return "H264 Loop Filter Beta Offset";
710 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE: return "H264 Loop Filter Mode";
711 case V4L2_CID_MPEG_VIDEO_H264_PROFILE: return "H264 Profile";
712 case V4L2_CID_MPEG_VIDEO_H264_VUI_EXT_SAR_HEIGHT: return "Vertical Size of SAR";
713 case V4L2_CID_MPEG_VIDEO_H264_VUI_EXT_SAR_WIDTH: return "Horizontal Size of SAR";
714 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_ENABLE: return "Aspect Ratio VUI Enable";
715 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC: return "VUI Aspect Ratio IDC";
716 case V4L2_CID_MPEG_VIDEO_H264_SEI_FRAME_PACKING: return "H264 Enable Frame Packing SEI";
717 case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_CURRENT_FRAME_0: return "H264 Set Curr. Frame as Frame0";
718 case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE: return "H264 FP Arrangement Type";
719 case V4L2_CID_MPEG_VIDEO_H264_FMO: return "H264 Flexible MB Ordering";
720 case V4L2_CID_MPEG_VIDEO_H264_FMO_MAP_TYPE: return "H264 Map Type for FMO";
721 case V4L2_CID_MPEG_VIDEO_H264_FMO_SLICE_GROUP: return "H264 FMO Number of Slice Groups";
722 case V4L2_CID_MPEG_VIDEO_H264_FMO_CHANGE_DIRECTION: return "H264 FMO Direction of Change";
723 case V4L2_CID_MPEG_VIDEO_H264_FMO_CHANGE_RATE: return "H264 FMO Size of 1st Slice Grp";
724 case V4L2_CID_MPEG_VIDEO_H264_FMO_RUN_LENGTH: return "H264 FMO No. of Consecutive MBs";
725 case V4L2_CID_MPEG_VIDEO_H264_ASO: return "H264 Arbitrary Slice Ordering";
726 case V4L2_CID_MPEG_VIDEO_H264_ASO_SLICE_ORDER: return "H264 ASO Slice Order";
727 case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING: return "Enable H264 Hierarchical Coding";
728 case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_TYPE: return "H264 Hierarchical Coding Type";
729 case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_LAYER:return "H264 Number of HC Layers";
730 case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_LAYER_QP:
731 return "H264 Set QP Value for HC Layers";
732 case V4L2_CID_MPEG_VIDEO_MPEG4_I_FRAME_QP: return "MPEG4 I-Frame QP Value";
733 case V4L2_CID_MPEG_VIDEO_MPEG4_P_FRAME_QP: return "MPEG4 P-Frame QP Value";
734 case V4L2_CID_MPEG_VIDEO_MPEG4_B_FRAME_QP: return "MPEG4 B-Frame QP Value";
735 case V4L2_CID_MPEG_VIDEO_MPEG4_MIN_QP: return "MPEG4 Minimum QP Value";
736 case V4L2_CID_MPEG_VIDEO_MPEG4_MAX_QP: return "MPEG4 Maximum QP Value";
737 case V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL: return "MPEG4 Level";
738 case V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE: return "MPEG4 Profile";
739 case V4L2_CID_MPEG_VIDEO_MPEG4_QPEL: return "Quarter Pixel Search Enable";
740 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MAX_BYTES: return "Maximum Bytes in a Slice";
741 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MAX_MB: return "Number of MBs in a Slice";
742 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE: return "Slice Partitioning Method";
743 case V4L2_CID_MPEG_VIDEO_VBV_SIZE: return "VBV Buffer Size";
744 case V4L2_CID_MPEG_VIDEO_DEC_PTS: return "Video Decoder PTS";
745 case V4L2_CID_MPEG_VIDEO_DEC_FRAME: return "Video Decoder Frame Count";
746 case V4L2_CID_MPEG_VIDEO_VBV_DELAY: return "Initial Delay for VBV Control";
747 case V4L2_CID_MPEG_VIDEO_MV_H_SEARCH_RANGE: return "Horizontal MV Search Range";
748 case V4L2_CID_MPEG_VIDEO_MV_V_SEARCH_RANGE: return "Vertical MV Search Range";
749 case V4L2_CID_MPEG_VIDEO_REPEAT_SEQ_HEADER: return "Repeat Sequence Header";
750
751 /* VPX controls */
752 case V4L2_CID_MPEG_VIDEO_VPX_NUM_PARTITIONS: return "VPX Number of Partitions";
753 case V4L2_CID_MPEG_VIDEO_VPX_IMD_DISABLE_4X4: return "VPX Intra Mode Decision Disable";
754 case V4L2_CID_MPEG_VIDEO_VPX_NUM_REF_FRAMES: return "VPX No. of Refs for P Frame";
755 case V4L2_CID_MPEG_VIDEO_VPX_FILTER_LEVEL: return "VPX Loop Filter Level Range";
756 case V4L2_CID_MPEG_VIDEO_VPX_FILTER_SHARPNESS: return "VPX Deblocking Effect Control";
757 case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_REF_PERIOD: return "VPX Golden Frame Refresh Period";
758 case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_SEL: return "VPX Golden Frame Indicator";
759 case V4L2_CID_MPEG_VIDEO_VPX_MIN_QP: return "VPX Minimum QP Value";
760 case V4L2_CID_MPEG_VIDEO_VPX_MAX_QP: return "VPX Maximum QP Value";
761 case V4L2_CID_MPEG_VIDEO_VPX_I_FRAME_QP: return "VPX I-Frame QP Value";
762 case V4L2_CID_MPEG_VIDEO_VPX_P_FRAME_QP: return "VPX P-Frame QP Value";
763 case V4L2_CID_MPEG_VIDEO_VPX_PROFILE: return "VPX Profile";
764
765 /* CAMERA controls */
766 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
767 case V4L2_CID_CAMERA_CLASS: return "Camera Controls";
768 case V4L2_CID_EXPOSURE_AUTO: return "Auto Exposure";
769 case V4L2_CID_EXPOSURE_ABSOLUTE: return "Exposure Time, Absolute";
770 case V4L2_CID_EXPOSURE_AUTO_PRIORITY: return "Exposure, Dynamic Framerate";
771 case V4L2_CID_PAN_RELATIVE: return "Pan, Relative";
772 case V4L2_CID_TILT_RELATIVE: return "Tilt, Relative";
773 case V4L2_CID_PAN_RESET: return "Pan, Reset";
774 case V4L2_CID_TILT_RESET: return "Tilt, Reset";
775 case V4L2_CID_PAN_ABSOLUTE: return "Pan, Absolute";
776 case V4L2_CID_TILT_ABSOLUTE: return "Tilt, Absolute";
777 case V4L2_CID_FOCUS_ABSOLUTE: return "Focus, Absolute";
778 case V4L2_CID_FOCUS_RELATIVE: return "Focus, Relative";
779 case V4L2_CID_FOCUS_AUTO: return "Focus, Automatic Continuous";
780 case V4L2_CID_ZOOM_ABSOLUTE: return "Zoom, Absolute";
781 case V4L2_CID_ZOOM_RELATIVE: return "Zoom, Relative";
782 case V4L2_CID_ZOOM_CONTINUOUS: return "Zoom, Continuous";
783 case V4L2_CID_PRIVACY: return "Privacy";
784 case V4L2_CID_IRIS_ABSOLUTE: return "Iris, Absolute";
785 case V4L2_CID_IRIS_RELATIVE: return "Iris, Relative";
786 case V4L2_CID_AUTO_EXPOSURE_BIAS: return "Auto Exposure, Bias";
787 case V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE: return "White Balance, Auto & Preset";
788 case V4L2_CID_WIDE_DYNAMIC_RANGE: return "Wide Dynamic Range";
789 case V4L2_CID_IMAGE_STABILIZATION: return "Image Stabilization";
790 case V4L2_CID_ISO_SENSITIVITY: return "ISO Sensitivity";
791 case V4L2_CID_ISO_SENSITIVITY_AUTO: return "ISO Sensitivity, Auto";
792 case V4L2_CID_EXPOSURE_METERING: return "Exposure, Metering Mode";
793 case V4L2_CID_SCENE_MODE: return "Scene Mode";
794 case V4L2_CID_3A_LOCK: return "3A Lock";
795 case V4L2_CID_AUTO_FOCUS_START: return "Auto Focus, Start";
796 case V4L2_CID_AUTO_FOCUS_STOP: return "Auto Focus, Stop";
797 case V4L2_CID_AUTO_FOCUS_STATUS: return "Auto Focus, Status";
798 case V4L2_CID_AUTO_FOCUS_RANGE: return "Auto Focus, Range";
799 case V4L2_CID_PAN_SPEED: return "Pan, Speed";
800 case V4L2_CID_TILT_SPEED: return "Tilt, Speed";
801
802 /* FM Radio Modulator controls */
803 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
804 case V4L2_CID_FM_TX_CLASS: return "FM Radio Modulator Controls";
805 case V4L2_CID_RDS_TX_DEVIATION: return "RDS Signal Deviation";
806 case V4L2_CID_RDS_TX_PI: return "RDS Program ID";
807 case V4L2_CID_RDS_TX_PTY: return "RDS Program Type";
808 case V4L2_CID_RDS_TX_PS_NAME: return "RDS PS Name";
809 case V4L2_CID_RDS_TX_RADIO_TEXT: return "RDS Radio Text";
810 case V4L2_CID_RDS_TX_MONO_STEREO: return "RDS Stereo";
811 case V4L2_CID_RDS_TX_ARTIFICIAL_HEAD: return "RDS Artificial Head";
812 case V4L2_CID_RDS_TX_COMPRESSED: return "RDS Compressed";
813 case V4L2_CID_RDS_TX_DYNAMIC_PTY: return "RDS Dynamic PTY";
814 case V4L2_CID_RDS_TX_TRAFFIC_ANNOUNCEMENT: return "RDS Traffic Announcement";
815 case V4L2_CID_RDS_TX_TRAFFIC_PROGRAM: return "RDS Traffic Program";
816 case V4L2_CID_RDS_TX_MUSIC_SPEECH: return "RDS Music";
817 case V4L2_CID_RDS_TX_ALT_FREQS_ENABLE: return "RDS Enable Alt Frequencies";
818 case V4L2_CID_RDS_TX_ALT_FREQS: return "RDS Alternate Frequencies";
819 case V4L2_CID_AUDIO_LIMITER_ENABLED: return "Audio Limiter Feature Enabled";
820 case V4L2_CID_AUDIO_LIMITER_RELEASE_TIME: return "Audio Limiter Release Time";
821 case V4L2_CID_AUDIO_LIMITER_DEVIATION: return "Audio Limiter Deviation";
822 case V4L2_CID_AUDIO_COMPRESSION_ENABLED: return "Audio Compression Enabled";
823 case V4L2_CID_AUDIO_COMPRESSION_GAIN: return "Audio Compression Gain";
824 case V4L2_CID_AUDIO_COMPRESSION_THRESHOLD: return "Audio Compression Threshold";
825 case V4L2_CID_AUDIO_COMPRESSION_ATTACK_TIME: return "Audio Compression Attack Time";
826 case V4L2_CID_AUDIO_COMPRESSION_RELEASE_TIME: return "Audio Compression Release Time";
827 case V4L2_CID_PILOT_TONE_ENABLED: return "Pilot Tone Feature Enabled";
828 case V4L2_CID_PILOT_TONE_DEVIATION: return "Pilot Tone Deviation";
829 case V4L2_CID_PILOT_TONE_FREQUENCY: return "Pilot Tone Frequency";
830 case V4L2_CID_TUNE_PREEMPHASIS: return "Pre-Emphasis";
831 case V4L2_CID_TUNE_POWER_LEVEL: return "Tune Power Level";
832 case V4L2_CID_TUNE_ANTENNA_CAPACITOR: return "Tune Antenna Capacitor";
833
834 /* Flash controls */
835 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
836 case V4L2_CID_FLASH_CLASS: return "Flash Controls";
837 case V4L2_CID_FLASH_LED_MODE: return "LED Mode";
838 case V4L2_CID_FLASH_STROBE_SOURCE: return "Strobe Source";
839 case V4L2_CID_FLASH_STROBE: return "Strobe";
840 case V4L2_CID_FLASH_STROBE_STOP: return "Stop Strobe";
841 case V4L2_CID_FLASH_STROBE_STATUS: return "Strobe Status";
842 case V4L2_CID_FLASH_TIMEOUT: return "Strobe Timeout";
843 case V4L2_CID_FLASH_INTENSITY: return "Intensity, Flash Mode";
844 case V4L2_CID_FLASH_TORCH_INTENSITY: return "Intensity, Torch Mode";
845 case V4L2_CID_FLASH_INDICATOR_INTENSITY: return "Intensity, Indicator";
846 case V4L2_CID_FLASH_FAULT: return "Faults";
847 case V4L2_CID_FLASH_CHARGE: return "Charge";
848 case V4L2_CID_FLASH_READY: return "Ready to Strobe";
849
850 /* JPEG encoder controls */
851 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
852 case V4L2_CID_JPEG_CLASS: return "JPEG Compression Controls";
853 case V4L2_CID_JPEG_CHROMA_SUBSAMPLING: return "Chroma Subsampling";
854 case V4L2_CID_JPEG_RESTART_INTERVAL: return "Restart Interval";
855 case V4L2_CID_JPEG_COMPRESSION_QUALITY: return "Compression Quality";
856 case V4L2_CID_JPEG_ACTIVE_MARKER: return "Active Markers";
857
858 /* Image source controls */
859 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
860 case V4L2_CID_IMAGE_SOURCE_CLASS: return "Image Source Controls";
861 case V4L2_CID_VBLANK: return "Vertical Blanking";
862 case V4L2_CID_HBLANK: return "Horizontal Blanking";
863 case V4L2_CID_ANALOGUE_GAIN: return "Analogue Gain";
864 case V4L2_CID_TEST_PATTERN_RED: return "Red Pixel Value";
865 case V4L2_CID_TEST_PATTERN_GREENR: return "Green (Red) Pixel Value";
866 case V4L2_CID_TEST_PATTERN_BLUE: return "Blue Pixel Value";
867 case V4L2_CID_TEST_PATTERN_GREENB: return "Green (Blue) Pixel Value";
868
869 /* Image processing controls */
870 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
871 case V4L2_CID_IMAGE_PROC_CLASS: return "Image Processing Controls";
872 case V4L2_CID_LINK_FREQ: return "Link Frequency";
873 case V4L2_CID_PIXEL_RATE: return "Pixel Rate";
874 case V4L2_CID_TEST_PATTERN: return "Test Pattern";
875
876 /* DV controls */
877 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
878 case V4L2_CID_DV_CLASS: return "Digital Video Controls";
879 case V4L2_CID_DV_TX_HOTPLUG: return "Hotplug Present";
880 case V4L2_CID_DV_TX_RXSENSE: return "RxSense Present";
881 case V4L2_CID_DV_TX_EDID_PRESENT: return "EDID Present";
882 case V4L2_CID_DV_TX_MODE: return "Transmit Mode";
883 case V4L2_CID_DV_TX_RGB_RANGE: return "Tx RGB Quantization Range";
884 case V4L2_CID_DV_RX_POWER_PRESENT: return "Power Present";
885 case V4L2_CID_DV_RX_RGB_RANGE: return "Rx RGB Quantization Range";
886
887 case V4L2_CID_FM_RX_CLASS: return "FM Radio Receiver Controls";
888 case V4L2_CID_TUNE_DEEMPHASIS: return "De-Emphasis";
889 case V4L2_CID_RDS_RECEPTION: return "RDS Reception";
890 case V4L2_CID_RF_TUNER_CLASS: return "RF Tuner Controls";
891 case V4L2_CID_RF_TUNER_LNA_GAIN_AUTO: return "LNA Gain, Auto";
892 case V4L2_CID_RF_TUNER_LNA_GAIN: return "LNA Gain";
893 case V4L2_CID_RF_TUNER_MIXER_GAIN_AUTO: return "Mixer Gain, Auto";
894 case V4L2_CID_RF_TUNER_MIXER_GAIN: return "Mixer Gain";
895 case V4L2_CID_RF_TUNER_IF_GAIN_AUTO: return "IF Gain, Auto";
896 case V4L2_CID_RF_TUNER_IF_GAIN: return "IF Gain";
897 case V4L2_CID_RF_TUNER_BANDWIDTH_AUTO: return "Bandwidth, Auto";
898 case V4L2_CID_RF_TUNER_BANDWIDTH: return "Bandwidth";
899 case V4L2_CID_RF_TUNER_PLL_LOCK: return "PLL Lock";
900 case V4L2_CID_RDS_RX_PTY: return "RDS Program Type";
901 case V4L2_CID_RDS_RX_PS_NAME: return "RDS PS Name";
902 case V4L2_CID_RDS_RX_RADIO_TEXT: return "RDS Radio Text";
903 case V4L2_CID_RDS_RX_TRAFFIC_ANNOUNCEMENT: return "RDS Traffic Announcement";
904 case V4L2_CID_RDS_RX_TRAFFIC_PROGRAM: return "RDS Traffic Program";
905 case V4L2_CID_RDS_RX_MUSIC_SPEECH: return "RDS Music";
906
907 /* Detection controls */
908 /* Keep the order of the 'case's the same as in v4l2-controls.h! */
909 case V4L2_CID_DETECT_CLASS: return "Detection Controls";
910 case V4L2_CID_DETECT_MD_MODE: return "Motion Detection Mode";
911 case V4L2_CID_DETECT_MD_GLOBAL_THRESHOLD: return "MD Global Threshold";
912 case V4L2_CID_DETECT_MD_THRESHOLD_GRID: return "MD Threshold Grid";
913 case V4L2_CID_DETECT_MD_REGION_GRID: return "MD Region Grid";
914 default:
915 return NULL;
916 }
917 }
918 EXPORT_SYMBOL(v4l2_ctrl_get_name);
919
920 void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type,
921 s64 *min, s64 *max, u64 *step, s64 *def, u32 *flags)
922 {
923 *name = v4l2_ctrl_get_name(id);
924 *flags = 0;
925
926 switch (id) {
927 case V4L2_CID_AUDIO_MUTE:
928 case V4L2_CID_AUDIO_LOUDNESS:
929 case V4L2_CID_AUTO_WHITE_BALANCE:
930 case V4L2_CID_AUTOGAIN:
931 case V4L2_CID_HFLIP:
932 case V4L2_CID_VFLIP:
933 case V4L2_CID_HUE_AUTO:
934 case V4L2_CID_CHROMA_AGC:
935 case V4L2_CID_COLOR_KILLER:
936 case V4L2_CID_AUTOBRIGHTNESS:
937 case V4L2_CID_MPEG_AUDIO_MUTE:
938 case V4L2_CID_MPEG_VIDEO_MUTE:
939 case V4L2_CID_MPEG_VIDEO_GOP_CLOSURE:
940 case V4L2_CID_MPEG_VIDEO_PULLDOWN:
941 case V4L2_CID_EXPOSURE_AUTO_PRIORITY:
942 case V4L2_CID_FOCUS_AUTO:
943 case V4L2_CID_PRIVACY:
944 case V4L2_CID_AUDIO_LIMITER_ENABLED:
945 case V4L2_CID_AUDIO_COMPRESSION_ENABLED:
946 case V4L2_CID_PILOT_TONE_ENABLED:
947 case V4L2_CID_ILLUMINATORS_1:
948 case V4L2_CID_ILLUMINATORS_2:
949 case V4L2_CID_FLASH_STROBE_STATUS:
950 case V4L2_CID_FLASH_CHARGE:
951 case V4L2_CID_FLASH_READY:
952 case V4L2_CID_MPEG_VIDEO_DECODER_MPEG4_DEBLOCK_FILTER:
953 case V4L2_CID_MPEG_VIDEO_DECODER_SLICE_INTERFACE:
954 case V4L2_CID_MPEG_VIDEO_FRAME_RC_ENABLE:
955 case V4L2_CID_MPEG_VIDEO_MB_RC_ENABLE:
956 case V4L2_CID_MPEG_VIDEO_H264_8X8_TRANSFORM:
957 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_ENABLE:
958 case V4L2_CID_MPEG_VIDEO_MPEG4_QPEL:
959 case V4L2_CID_MPEG_VIDEO_REPEAT_SEQ_HEADER:
960 case V4L2_CID_WIDE_DYNAMIC_RANGE:
961 case V4L2_CID_IMAGE_STABILIZATION:
962 case V4L2_CID_RDS_RECEPTION:
963 case V4L2_CID_RF_TUNER_LNA_GAIN_AUTO:
964 case V4L2_CID_RF_TUNER_MIXER_GAIN_AUTO:
965 case V4L2_CID_RF_TUNER_IF_GAIN_AUTO:
966 case V4L2_CID_RF_TUNER_BANDWIDTH_AUTO:
967 case V4L2_CID_RF_TUNER_PLL_LOCK:
968 case V4L2_CID_RDS_TX_MONO_STEREO:
969 case V4L2_CID_RDS_TX_ARTIFICIAL_HEAD:
970 case V4L2_CID_RDS_TX_COMPRESSED:
971 case V4L2_CID_RDS_TX_DYNAMIC_PTY:
972 case V4L2_CID_RDS_TX_TRAFFIC_ANNOUNCEMENT:
973 case V4L2_CID_RDS_TX_TRAFFIC_PROGRAM:
974 case V4L2_CID_RDS_TX_MUSIC_SPEECH:
975 case V4L2_CID_RDS_TX_ALT_FREQS_ENABLE:
976 case V4L2_CID_RDS_RX_TRAFFIC_ANNOUNCEMENT:
977 case V4L2_CID_RDS_RX_TRAFFIC_PROGRAM:
978 case V4L2_CID_RDS_RX_MUSIC_SPEECH:
979 *type = V4L2_CTRL_TYPE_BOOLEAN;
980 *min = 0;
981 *max = *step = 1;
982 break;
983 case V4L2_CID_MPEG_VIDEO_MV_H_SEARCH_RANGE:
984 case V4L2_CID_MPEG_VIDEO_MV_V_SEARCH_RANGE:
985 *type = V4L2_CTRL_TYPE_INTEGER;
986 break;
987 case V4L2_CID_PAN_RESET:
988 case V4L2_CID_TILT_RESET:
989 case V4L2_CID_FLASH_STROBE:
990 case V4L2_CID_FLASH_STROBE_STOP:
991 case V4L2_CID_AUTO_FOCUS_START:
992 case V4L2_CID_AUTO_FOCUS_STOP:
993 *type = V4L2_CTRL_TYPE_BUTTON;
994 *flags |= V4L2_CTRL_FLAG_WRITE_ONLY |
995 V4L2_CTRL_FLAG_EXECUTE_ON_WRITE;
996 *min = *max = *step = *def = 0;
997 break;
998 case V4L2_CID_POWER_LINE_FREQUENCY:
999 case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ:
1000 case V4L2_CID_MPEG_AUDIO_ENCODING:
1001 case V4L2_CID_MPEG_AUDIO_L1_BITRATE:
1002 case V4L2_CID_MPEG_AUDIO_L2_BITRATE:
1003 case V4L2_CID_MPEG_AUDIO_L3_BITRATE:
1004 case V4L2_CID_MPEG_AUDIO_AC3_BITRATE:
1005 case V4L2_CID_MPEG_AUDIO_MODE:
1006 case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION:
1007 case V4L2_CID_MPEG_AUDIO_EMPHASIS:
1008 case V4L2_CID_MPEG_AUDIO_CRC:
1009 case V4L2_CID_MPEG_AUDIO_DEC_PLAYBACK:
1010 case V4L2_CID_MPEG_AUDIO_DEC_MULTILINGUAL_PLAYBACK:
1011 case V4L2_CID_MPEG_VIDEO_ENCODING:
1012 case V4L2_CID_MPEG_VIDEO_ASPECT:
1013 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
1014 case V4L2_CID_MPEG_STREAM_TYPE:
1015 case V4L2_CID_MPEG_STREAM_VBI_FMT:
1016 case V4L2_CID_EXPOSURE_AUTO:
1017 case V4L2_CID_AUTO_FOCUS_RANGE:
1018 case V4L2_CID_COLORFX:
1019 case V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE:
1020 case V4L2_CID_TUNE_PREEMPHASIS:
1021 case V4L2_CID_FLASH_LED_MODE:
1022 case V4L2_CID_FLASH_STROBE_SOURCE:
1023 case V4L2_CID_MPEG_VIDEO_HEADER_MODE:
1024 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE:
1025 case V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE:
1026 case V4L2_CID_MPEG_VIDEO_H264_LEVEL:
1027 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE:
1028 case V4L2_CID_MPEG_VIDEO_H264_PROFILE:
1029 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC:
1030 case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE:
1031 case V4L2_CID_MPEG_VIDEO_H264_FMO_MAP_TYPE:
1032 case V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL:
1033 case V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE:
1034 case V4L2_CID_JPEG_CHROMA_SUBSAMPLING:
1035 case V4L2_CID_ISO_SENSITIVITY_AUTO:
1036 case V4L2_CID_EXPOSURE_METERING:
1037 case V4L2_CID_SCENE_MODE:
1038 case V4L2_CID_DV_TX_MODE:
1039 case V4L2_CID_DV_TX_RGB_RANGE:
1040 case V4L2_CID_DV_RX_RGB_RANGE:
1041 case V4L2_CID_TEST_PATTERN:
1042 case V4L2_CID_TUNE_DEEMPHASIS:
1043 case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_SEL:
1044 case V4L2_CID_DETECT_MD_MODE:
1045 *type = V4L2_CTRL_TYPE_MENU;
1046 break;
1047 case V4L2_CID_LINK_FREQ:
1048 *type = V4L2_CTRL_TYPE_INTEGER_MENU;
1049 break;
1050 case V4L2_CID_RDS_TX_PS_NAME:
1051 case V4L2_CID_RDS_TX_RADIO_TEXT:
1052 case V4L2_CID_RDS_RX_PS_NAME:
1053 case V4L2_CID_RDS_RX_RADIO_TEXT:
1054 *type = V4L2_CTRL_TYPE_STRING;
1055 break;
1056 case V4L2_CID_ISO_SENSITIVITY:
1057 case V4L2_CID_AUTO_EXPOSURE_BIAS:
1058 case V4L2_CID_MPEG_VIDEO_VPX_NUM_PARTITIONS:
1059 case V4L2_CID_MPEG_VIDEO_VPX_NUM_REF_FRAMES:
1060 *type = V4L2_CTRL_TYPE_INTEGER_MENU;
1061 break;
1062 case V4L2_CID_USER_CLASS:
1063 case V4L2_CID_CAMERA_CLASS:
1064 case V4L2_CID_MPEG_CLASS:
1065 case V4L2_CID_FM_TX_CLASS:
1066 case V4L2_CID_FLASH_CLASS:
1067 case V4L2_CID_JPEG_CLASS:
1068 case V4L2_CID_IMAGE_SOURCE_CLASS:
1069 case V4L2_CID_IMAGE_PROC_CLASS:
1070 case V4L2_CID_DV_CLASS:
1071 case V4L2_CID_FM_RX_CLASS:
1072 case V4L2_CID_RF_TUNER_CLASS:
1073 case V4L2_CID_DETECT_CLASS:
1074 *type = V4L2_CTRL_TYPE_CTRL_CLASS;
1075 /* You can neither read not write these */
1076 *flags |= V4L2_CTRL_FLAG_READ_ONLY | V4L2_CTRL_FLAG_WRITE_ONLY;
1077 *min = *max = *step = *def = 0;
1078 break;
1079 case V4L2_CID_BG_COLOR:
1080 *type = V4L2_CTRL_TYPE_INTEGER;
1081 *step = 1;
1082 *min = 0;
1083 /* Max is calculated as RGB888 that is 2^24 */
1084 *max = 0xFFFFFF;
1085 break;
1086 case V4L2_CID_FLASH_FAULT:
1087 case V4L2_CID_JPEG_ACTIVE_MARKER:
1088 case V4L2_CID_3A_LOCK:
1089 case V4L2_CID_AUTO_FOCUS_STATUS:
1090 case V4L2_CID_DV_TX_HOTPLUG:
1091 case V4L2_CID_DV_TX_RXSENSE:
1092 case V4L2_CID_DV_TX_EDID_PRESENT:
1093 case V4L2_CID_DV_RX_POWER_PRESENT:
1094 *type = V4L2_CTRL_TYPE_BITMASK;
1095 break;
1096 case V4L2_CID_MIN_BUFFERS_FOR_CAPTURE:
1097 case V4L2_CID_MIN_BUFFERS_FOR_OUTPUT:
1098 *type = V4L2_CTRL_TYPE_INTEGER;
1099 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
1100 break;
1101 case V4L2_CID_MPEG_VIDEO_DEC_PTS:
1102 *type = V4L2_CTRL_TYPE_INTEGER64;
1103 *flags |= V4L2_CTRL_FLAG_VOLATILE | V4L2_CTRL_FLAG_READ_ONLY;
1104 *min = *def = 0;
1105 *max = 0x1ffffffffLL;
1106 *step = 1;
1107 break;
1108 case V4L2_CID_MPEG_VIDEO_DEC_FRAME:
1109 *type = V4L2_CTRL_TYPE_INTEGER64;
1110 *flags |= V4L2_CTRL_FLAG_VOLATILE | V4L2_CTRL_FLAG_READ_ONLY;
1111 *min = *def = 0;
1112 *max = 0x7fffffffffffffffLL;
1113 *step = 1;
1114 break;
1115 case V4L2_CID_PIXEL_RATE:
1116 *type = V4L2_CTRL_TYPE_INTEGER64;
1117 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
1118 break;
1119 case V4L2_CID_DETECT_MD_REGION_GRID:
1120 *type = V4L2_CTRL_TYPE_U8;
1121 break;
1122 case V4L2_CID_DETECT_MD_THRESHOLD_GRID:
1123 *type = V4L2_CTRL_TYPE_U16;
1124 break;
1125 case V4L2_CID_RDS_TX_ALT_FREQS:
1126 *type = V4L2_CTRL_TYPE_U32;
1127 break;
1128 default:
1129 *type = V4L2_CTRL_TYPE_INTEGER;
1130 break;
1131 }
1132 switch (id) {
1133 case V4L2_CID_MPEG_AUDIO_ENCODING:
1134 case V4L2_CID_MPEG_AUDIO_MODE:
1135 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
1136 case V4L2_CID_MPEG_VIDEO_B_FRAMES:
1137 case V4L2_CID_MPEG_STREAM_TYPE:
1138 *flags |= V4L2_CTRL_FLAG_UPDATE;
1139 break;
1140 case V4L2_CID_AUDIO_VOLUME:
1141 case V4L2_CID_AUDIO_BALANCE:
1142 case V4L2_CID_AUDIO_BASS:
1143 case V4L2_CID_AUDIO_TREBLE:
1144 case V4L2_CID_BRIGHTNESS:
1145 case V4L2_CID_CONTRAST:
1146 case V4L2_CID_SATURATION:
1147 case V4L2_CID_HUE:
1148 case V4L2_CID_RED_BALANCE:
1149 case V4L2_CID_BLUE_BALANCE:
1150 case V4L2_CID_GAMMA:
1151 case V4L2_CID_SHARPNESS:
1152 case V4L2_CID_CHROMA_GAIN:
1153 case V4L2_CID_RDS_TX_DEVIATION:
1154 case V4L2_CID_AUDIO_LIMITER_RELEASE_TIME:
1155 case V4L2_CID_AUDIO_LIMITER_DEVIATION:
1156 case V4L2_CID_AUDIO_COMPRESSION_GAIN:
1157 case V4L2_CID_AUDIO_COMPRESSION_THRESHOLD:
1158 case V4L2_CID_AUDIO_COMPRESSION_ATTACK_TIME:
1159 case V4L2_CID_AUDIO_COMPRESSION_RELEASE_TIME:
1160 case V4L2_CID_PILOT_TONE_DEVIATION:
1161 case V4L2_CID_PILOT_TONE_FREQUENCY:
1162 case V4L2_CID_TUNE_POWER_LEVEL:
1163 case V4L2_CID_TUNE_ANTENNA_CAPACITOR:
1164 case V4L2_CID_RF_TUNER_LNA_GAIN:
1165 case V4L2_CID_RF_TUNER_MIXER_GAIN:
1166 case V4L2_CID_RF_TUNER_IF_GAIN:
1167 case V4L2_CID_RF_TUNER_BANDWIDTH:
1168 case V4L2_CID_DETECT_MD_GLOBAL_THRESHOLD:
1169 *flags |= V4L2_CTRL_FLAG_SLIDER;
1170 break;
1171 case V4L2_CID_PAN_RELATIVE:
1172 case V4L2_CID_TILT_RELATIVE:
1173 case V4L2_CID_FOCUS_RELATIVE:
1174 case V4L2_CID_IRIS_RELATIVE:
1175 case V4L2_CID_ZOOM_RELATIVE:
1176 *flags |= V4L2_CTRL_FLAG_WRITE_ONLY |
1177 V4L2_CTRL_FLAG_EXECUTE_ON_WRITE;
1178 break;
1179 case V4L2_CID_FLASH_STROBE_STATUS:
1180 case V4L2_CID_AUTO_FOCUS_STATUS:
1181 case V4L2_CID_FLASH_READY:
1182 case V4L2_CID_DV_TX_HOTPLUG:
1183 case V4L2_CID_DV_TX_RXSENSE:
1184 case V4L2_CID_DV_TX_EDID_PRESENT:
1185 case V4L2_CID_DV_RX_POWER_PRESENT:
1186 case V4L2_CID_RDS_RX_PTY:
1187 case V4L2_CID_RDS_RX_PS_NAME:
1188 case V4L2_CID_RDS_RX_RADIO_TEXT:
1189 case V4L2_CID_RDS_RX_TRAFFIC_ANNOUNCEMENT:
1190 case V4L2_CID_RDS_RX_TRAFFIC_PROGRAM:
1191 case V4L2_CID_RDS_RX_MUSIC_SPEECH:
1192 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
1193 break;
1194 case V4L2_CID_RF_TUNER_PLL_LOCK:
1195 *flags |= V4L2_CTRL_FLAG_VOLATILE;
1196 break;
1197 }
1198 }
1199 EXPORT_SYMBOL(v4l2_ctrl_fill);
1200
1201 static void fill_event(struct v4l2_event *ev, struct v4l2_ctrl *ctrl, u32 changes)
1202 {
1203 memset(ev->reserved, 0, sizeof(ev->reserved));
1204 ev->type = V4L2_EVENT_CTRL;
1205 ev->id = ctrl->id;
1206 ev->u.ctrl.changes = changes;
1207 ev->u.ctrl.type = ctrl->type;
1208 ev->u.ctrl.flags = ctrl->flags;
1209 if (ctrl->is_ptr)
1210 ev->u.ctrl.value64 = 0;
1211 else
1212 ev->u.ctrl.value64 = *ctrl->p_cur.p_s64;
1213 ev->u.ctrl.minimum = ctrl->minimum;
1214 ev->u.ctrl.maximum = ctrl->maximum;
1215 if (ctrl->type == V4L2_CTRL_TYPE_MENU
1216 || ctrl->type == V4L2_CTRL_TYPE_INTEGER_MENU)
1217 ev->u.ctrl.step = 1;
1218 else
1219 ev->u.ctrl.step = ctrl->step;
1220 ev->u.ctrl.default_value = ctrl->default_value;
1221 }
1222
1223 static void send_event(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, u32 changes)
1224 {
1225 struct v4l2_event ev;
1226 struct v4l2_subscribed_event *sev;
1227
1228 if (list_empty(&ctrl->ev_subs))
1229 return;
1230 fill_event(&ev, ctrl, changes);
1231
1232 list_for_each_entry(sev, &ctrl->ev_subs, node)
1233 if (sev->fh != fh ||
1234 (sev->flags & V4L2_EVENT_SUB_FL_ALLOW_FEEDBACK))
1235 v4l2_event_queue_fh(sev->fh, &ev);
1236 }
1237
1238 static bool std_equal(const struct v4l2_ctrl *ctrl, u32 idx,
1239 union v4l2_ctrl_ptr ptr1,
1240 union v4l2_ctrl_ptr ptr2)
1241 {
1242 switch (ctrl->type) {
1243 case V4L2_CTRL_TYPE_BUTTON:
1244 return false;
1245 case V4L2_CTRL_TYPE_STRING:
1246 idx *= ctrl->elem_size;
1247 /* strings are always 0-terminated */
1248 return !strcmp(ptr1.p_char + idx, ptr2.p_char + idx);
1249 case V4L2_CTRL_TYPE_INTEGER64:
1250 return ptr1.p_s64[idx] == ptr2.p_s64[idx];
1251 case V4L2_CTRL_TYPE_U8:
1252 return ptr1.p_u8[idx] == ptr2.p_u8[idx];
1253 case V4L2_CTRL_TYPE_U16:
1254 return ptr1.p_u16[idx] == ptr2.p_u16[idx];
1255 case V4L2_CTRL_TYPE_U32:
1256 return ptr1.p_u32[idx] == ptr2.p_u32[idx];
1257 default:
1258 if (ctrl->is_int)
1259 return ptr1.p_s32[idx] == ptr2.p_s32[idx];
1260 idx *= ctrl->elem_size;
1261 return !memcmp(ptr1.p + idx, ptr2.p + idx, ctrl->elem_size);
1262 }
1263 }
1264
1265 static void std_init(const struct v4l2_ctrl *ctrl, u32 idx,
1266 union v4l2_ctrl_ptr ptr)
1267 {
1268 switch (ctrl->type) {
1269 case V4L2_CTRL_TYPE_STRING:
1270 idx *= ctrl->elem_size;
1271 memset(ptr.p_char + idx, ' ', ctrl->minimum);
1272 ptr.p_char[idx + ctrl->minimum] = '\0';
1273 break;
1274 case V4L2_CTRL_TYPE_INTEGER64:
1275 ptr.p_s64[idx] = ctrl->default_value;
1276 break;
1277 case V4L2_CTRL_TYPE_INTEGER:
1278 case V4L2_CTRL_TYPE_INTEGER_MENU:
1279 case V4L2_CTRL_TYPE_MENU:
1280 case V4L2_CTRL_TYPE_BITMASK:
1281 case V4L2_CTRL_TYPE_BOOLEAN:
1282 ptr.p_s32[idx] = ctrl->default_value;
1283 break;
1284 case V4L2_CTRL_TYPE_U8:
1285 ptr.p_u8[idx] = ctrl->default_value;
1286 break;
1287 case V4L2_CTRL_TYPE_U16:
1288 ptr.p_u16[idx] = ctrl->default_value;
1289 break;
1290 case V4L2_CTRL_TYPE_U32:
1291 ptr.p_u32[idx] = ctrl->default_value;
1292 break;
1293 default:
1294 idx *= ctrl->elem_size;
1295 memset(ptr.p + idx, 0, ctrl->elem_size);
1296 break;
1297 }
1298 }
1299
1300 static void std_log(const struct v4l2_ctrl *ctrl)
1301 {
1302 union v4l2_ctrl_ptr ptr = ctrl->p_cur;
1303
1304 if (ctrl->is_array) {
1305 unsigned i;
1306
1307 for (i = 0; i < ctrl->nr_of_dims; i++)
1308 pr_cont("[%u]", ctrl->dims[i]);
1309 pr_cont(" ");
1310 }
1311
1312 switch (ctrl->type) {
1313 case V4L2_CTRL_TYPE_INTEGER:
1314 pr_cont("%d", *ptr.p_s32);
1315 break;
1316 case V4L2_CTRL_TYPE_BOOLEAN:
1317 pr_cont("%s", *ptr.p_s32 ? "true" : "false");
1318 break;
1319 case V4L2_CTRL_TYPE_MENU:
1320 pr_cont("%s", ctrl->qmenu[*ptr.p_s32]);
1321 break;
1322 case V4L2_CTRL_TYPE_INTEGER_MENU:
1323 pr_cont("%lld", ctrl->qmenu_int[*ptr.p_s32]);
1324 break;
1325 case V4L2_CTRL_TYPE_BITMASK:
1326 pr_cont("0x%08x", *ptr.p_s32);
1327 break;
1328 case V4L2_CTRL_TYPE_INTEGER64:
1329 pr_cont("%lld", *ptr.p_s64);
1330 break;
1331 case V4L2_CTRL_TYPE_STRING:
1332 pr_cont("%s", ptr.p_char);
1333 break;
1334 case V4L2_CTRL_TYPE_U8:
1335 pr_cont("%u", (unsigned)*ptr.p_u8);
1336 break;
1337 case V4L2_CTRL_TYPE_U16:
1338 pr_cont("%u", (unsigned)*ptr.p_u16);
1339 break;
1340 case V4L2_CTRL_TYPE_U32:
1341 pr_cont("%u", (unsigned)*ptr.p_u32);
1342 break;
1343 default:
1344 pr_cont("unknown type %d", ctrl->type);
1345 break;
1346 }
1347 }
1348
1349 /*
1350 * Round towards the closest legal value. Be careful when we are
1351 * close to the maximum range of the control type to prevent
1352 * wrap-arounds.
1353 */
1354 #define ROUND_TO_RANGE(val, offset_type, ctrl) \
1355 ({ \
1356 offset_type offset; \
1357 if ((ctrl)->maximum >= 0 && \
1358 val >= (ctrl)->maximum - (s32)((ctrl)->step / 2)) \
1359 val = (ctrl)->maximum; \
1360 else \
1361 val += (s32)((ctrl)->step / 2); \
1362 val = clamp_t(typeof(val), val, \
1363 (ctrl)->minimum, (ctrl)->maximum); \
1364 offset = (val) - (ctrl)->minimum; \
1365 offset = (ctrl)->step * (offset / (u32)(ctrl)->step); \
1366 val = (ctrl)->minimum + offset; \
1367 0; \
1368 })
1369
1370 /* Validate a new control */
1371 static int std_validate(const struct v4l2_ctrl *ctrl, u32 idx,
1372 union v4l2_ctrl_ptr ptr)
1373 {
1374 size_t len;
1375 u64 offset;
1376 s64 val;
1377
1378 switch (ctrl->type) {
1379 case V4L2_CTRL_TYPE_INTEGER:
1380 return ROUND_TO_RANGE(ptr.p_s32[idx], u32, ctrl);
1381 case V4L2_CTRL_TYPE_INTEGER64:
1382 /*
1383 * We can't use the ROUND_TO_RANGE define here due to
1384 * the u64 divide that needs special care.
1385 */
1386 val = ptr.p_s64[idx];
1387 if (ctrl->maximum >= 0 && val >= ctrl->maximum - (s64)(ctrl->step / 2))
1388 val = ctrl->maximum;
1389 else
1390 val += (s64)(ctrl->step / 2);
1391 val = clamp_t(s64, val, ctrl->minimum, ctrl->maximum);
1392 offset = val - ctrl->minimum;
1393 do_div(offset, ctrl->step);
1394 ptr.p_s64[idx] = ctrl->minimum + offset * ctrl->step;
1395 return 0;
1396 case V4L2_CTRL_TYPE_U8:
1397 return ROUND_TO_RANGE(ptr.p_u8[idx], u8, ctrl);
1398 case V4L2_CTRL_TYPE_U16:
1399 return ROUND_TO_RANGE(ptr.p_u16[idx], u16, ctrl);
1400 case V4L2_CTRL_TYPE_U32:
1401 return ROUND_TO_RANGE(ptr.p_u32[idx], u32, ctrl);
1402
1403 case V4L2_CTRL_TYPE_BOOLEAN:
1404 ptr.p_s32[idx] = !!ptr.p_s32[idx];
1405 return 0;
1406
1407 case V4L2_CTRL_TYPE_MENU:
1408 case V4L2_CTRL_TYPE_INTEGER_MENU:
1409 if (ptr.p_s32[idx] < ctrl->minimum || ptr.p_s32[idx] > ctrl->maximum)
1410 return -ERANGE;
1411 if (ctrl->menu_skip_mask & (1 << ptr.p_s32[idx]))
1412 return -EINVAL;
1413 if (ctrl->type == V4L2_CTRL_TYPE_MENU &&
1414 ctrl->qmenu[ptr.p_s32[idx]][0] == '\0')
1415 return -EINVAL;
1416 return 0;
1417
1418 case V4L2_CTRL_TYPE_BITMASK:
1419 ptr.p_s32[idx] &= ctrl->maximum;
1420 return 0;
1421
1422 case V4L2_CTRL_TYPE_BUTTON:
1423 case V4L2_CTRL_TYPE_CTRL_CLASS:
1424 ptr.p_s32[idx] = 0;
1425 return 0;
1426
1427 case V4L2_CTRL_TYPE_STRING:
1428 idx *= ctrl->elem_size;
1429 len = strlen(ptr.p_char + idx);
1430 if (len < ctrl->minimum)
1431 return -ERANGE;
1432 if ((len - (u32)ctrl->minimum) % (u32)ctrl->step)
1433 return -ERANGE;
1434 return 0;
1435
1436 default:
1437 return -EINVAL;
1438 }
1439 }
1440
1441 static const struct v4l2_ctrl_type_ops std_type_ops = {
1442 .equal = std_equal,
1443 .init = std_init,
1444 .log = std_log,
1445 .validate = std_validate,
1446 };
1447
1448 /* Helper function: copy the given control value back to the caller */
1449 static int ptr_to_user(struct v4l2_ext_control *c,
1450 struct v4l2_ctrl *ctrl,
1451 union v4l2_ctrl_ptr ptr)
1452 {
1453 u32 len;
1454
1455 if (ctrl->is_ptr && !ctrl->is_string)
1456 return copy_to_user(c->ptr, ptr.p, c->size) ?
1457 -EFAULT : 0;
1458
1459 switch (ctrl->type) {
1460 case V4L2_CTRL_TYPE_STRING:
1461 len = strlen(ptr.p_char);
1462 if (c->size < len + 1) {
1463 c->size = ctrl->elem_size;
1464 return -ENOSPC;
1465 }
1466 return copy_to_user(c->string, ptr.p_char, len + 1) ?
1467 -EFAULT : 0;
1468 case V4L2_CTRL_TYPE_INTEGER64:
1469 c->value64 = *ptr.p_s64;
1470 break;
1471 default:
1472 c->value = *ptr.p_s32;
1473 break;
1474 }
1475 return 0;
1476 }
1477
1478 /* Helper function: copy the current control value back to the caller */
1479 static int cur_to_user(struct v4l2_ext_control *c,
1480 struct v4l2_ctrl *ctrl)
1481 {
1482 return ptr_to_user(c, ctrl, ctrl->p_cur);
1483 }
1484
1485 /* Helper function: copy the new control value back to the caller */
1486 static int new_to_user(struct v4l2_ext_control *c,
1487 struct v4l2_ctrl *ctrl)
1488 {
1489 return ptr_to_user(c, ctrl, ctrl->p_new);
1490 }
1491
1492 /* Helper function: copy the caller-provider value to the given control value */
1493 static int user_to_ptr(struct v4l2_ext_control *c,
1494 struct v4l2_ctrl *ctrl,
1495 union v4l2_ctrl_ptr ptr)
1496 {
1497 int ret;
1498 u32 size;
1499
1500 ctrl->is_new = 1;
1501 if (ctrl->is_ptr && !ctrl->is_string) {
1502 unsigned idx;
1503
1504 ret = copy_from_user(ptr.p, c->ptr, c->size) ? -EFAULT : 0;
1505 if (ret || !ctrl->is_array)
1506 return ret;
1507 for (idx = c->size / ctrl->elem_size; idx < ctrl->elems; idx++)
1508 ctrl->type_ops->init(ctrl, idx, ptr);
1509 return 0;
1510 }
1511
1512 switch (ctrl->type) {
1513 case V4L2_CTRL_TYPE_INTEGER64:
1514 *ptr.p_s64 = c->value64;
1515 break;
1516 case V4L2_CTRL_TYPE_STRING:
1517 size = c->size;
1518 if (size == 0)
1519 return -ERANGE;
1520 if (size > ctrl->maximum + 1)
1521 size = ctrl->maximum + 1;
1522 ret = copy_from_user(ptr.p_char, c->string, size) ? -EFAULT : 0;
1523 if (!ret) {
1524 char last = ptr.p_char[size - 1];
1525
1526 ptr.p_char[size - 1] = 0;
1527 /* If the string was longer than ctrl->maximum,
1528 then return an error. */
1529 if (strlen(ptr.p_char) == ctrl->maximum && last)
1530 return -ERANGE;
1531 }
1532 return ret;
1533 default:
1534 *ptr.p_s32 = c->value;
1535 break;
1536 }
1537 return 0;
1538 }
1539
1540 /* Helper function: copy the caller-provider value as the new control value */
1541 static int user_to_new(struct v4l2_ext_control *c,
1542 struct v4l2_ctrl *ctrl)
1543 {
1544 return user_to_ptr(c, ctrl, ctrl->p_new);
1545 }
1546
1547 /* Copy the one value to another. */
1548 static void ptr_to_ptr(struct v4l2_ctrl *ctrl,
1549 union v4l2_ctrl_ptr from, union v4l2_ctrl_ptr to)
1550 {
1551 if (ctrl == NULL)
1552 return;
1553 memcpy(to.p, from.p, ctrl->elems * ctrl->elem_size);
1554 }
1555
1556 /* Copy the new value to the current value. */
1557 static void new_to_cur(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, u32 ch_flags)
1558 {
1559 bool changed;
1560
1561 if (ctrl == NULL)
1562 return;
1563
1564 /* has_changed is set by cluster_changed */
1565 changed = ctrl->has_changed;
1566 if (changed)
1567 ptr_to_ptr(ctrl, ctrl->p_new, ctrl->p_cur);
1568
1569 if (ch_flags & V4L2_EVENT_CTRL_CH_FLAGS) {
1570 /* Note: CH_FLAGS is only set for auto clusters. */
1571 ctrl->flags &=
1572 ~(V4L2_CTRL_FLAG_INACTIVE | V4L2_CTRL_FLAG_VOLATILE);
1573 if (!is_cur_manual(ctrl->cluster[0])) {
1574 ctrl->flags |= V4L2_CTRL_FLAG_INACTIVE;
1575 if (ctrl->cluster[0]->has_volatiles)
1576 ctrl->flags |= V4L2_CTRL_FLAG_VOLATILE;
1577 }
1578 fh = NULL;
1579 }
1580 if (changed || ch_flags) {
1581 /* If a control was changed that was not one of the controls
1582 modified by the application, then send the event to all. */
1583 if (!ctrl->is_new)
1584 fh = NULL;
1585 send_event(fh, ctrl,
1586 (changed ? V4L2_EVENT_CTRL_CH_VALUE : 0) | ch_flags);
1587 if (ctrl->call_notify && changed && ctrl->handler->notify)
1588 ctrl->handler->notify(ctrl, ctrl->handler->notify_priv);
1589 }
1590 }
1591
1592 /* Copy the current value to the new value */
1593 static void cur_to_new(struct v4l2_ctrl *ctrl)
1594 {
1595 if (ctrl == NULL)
1596 return;
1597 ptr_to_ptr(ctrl, ctrl->p_cur, ctrl->p_new);
1598 }
1599
1600 /* Return non-zero if one or more of the controls in the cluster has a new
1601 value that differs from the current value. */
1602 static int cluster_changed(struct v4l2_ctrl *master)
1603 {
1604 bool changed = false;
1605 unsigned idx;
1606 int i;
1607
1608 for (i = 0; i < master->ncontrols; i++) {
1609 struct v4l2_ctrl *ctrl = master->cluster[i];
1610 bool ctrl_changed = false;
1611
1612 if (ctrl == NULL)
1613 continue;
1614
1615 if (ctrl->flags & V4L2_CTRL_FLAG_EXECUTE_ON_WRITE)
1616 changed = ctrl_changed = true;
1617
1618 /*
1619 * Set has_changed to false to avoid generating
1620 * the event V4L2_EVENT_CTRL_CH_VALUE
1621 */
1622 if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE) {
1623 ctrl->has_changed = false;
1624 continue;
1625 }
1626
1627 for (idx = 0; !ctrl_changed && idx < ctrl->elems; idx++)
1628 ctrl_changed = !ctrl->type_ops->equal(ctrl, idx,
1629 ctrl->p_cur, ctrl->p_new);
1630 ctrl->has_changed = ctrl_changed;
1631 changed |= ctrl->has_changed;
1632 }
1633 return changed;
1634 }
1635
1636 /* Control range checking */
1637 static int check_range(enum v4l2_ctrl_type type,
1638 s64 min, s64 max, u64 step, s64 def)
1639 {
1640 switch (type) {
1641 case V4L2_CTRL_TYPE_BOOLEAN:
1642 if (step != 1 || max > 1 || min < 0)
1643 return -ERANGE;
1644 /* fall through */
1645 case V4L2_CTRL_TYPE_U8:
1646 case V4L2_CTRL_TYPE_U16:
1647 case V4L2_CTRL_TYPE_U32:
1648 case V4L2_CTRL_TYPE_INTEGER:
1649 case V4L2_CTRL_TYPE_INTEGER64:
1650 if (step == 0 || min > max || def < min || def > max)
1651 return -ERANGE;
1652 return 0;
1653 case V4L2_CTRL_TYPE_BITMASK:
1654 if (step || min || !max || (def & ~max))
1655 return -ERANGE;
1656 return 0;
1657 case V4L2_CTRL_TYPE_MENU:
1658 case V4L2_CTRL_TYPE_INTEGER_MENU:
1659 if (min > max || def < min || def > max)
1660 return -ERANGE;
1661 /* Note: step == menu_skip_mask for menu controls.
1662 So here we check if the default value is masked out. */
1663 if (step && ((1 << def) & step))
1664 return -EINVAL;
1665 return 0;
1666 case V4L2_CTRL_TYPE_STRING:
1667 if (min > max || min < 0 || step < 1 || def)
1668 return -ERANGE;
1669 return 0;
1670 default:
1671 return 0;
1672 }
1673 }
1674
1675 /* Validate a new control */
1676 static int validate_new(const struct v4l2_ctrl *ctrl, union v4l2_ctrl_ptr p_new)
1677 {
1678 unsigned idx;
1679 int err = 0;
1680
1681 if (!ctrl->is_ptr) {
1682 switch (ctrl->type) {
1683 case V4L2_CTRL_TYPE_INTEGER:
1684 case V4L2_CTRL_TYPE_INTEGER_MENU:
1685 case V4L2_CTRL_TYPE_MENU:
1686 case V4L2_CTRL_TYPE_BITMASK:
1687 case V4L2_CTRL_TYPE_BOOLEAN:
1688 case V4L2_CTRL_TYPE_BUTTON:
1689 case V4L2_CTRL_TYPE_CTRL_CLASS:
1690 case V4L2_CTRL_TYPE_INTEGER64:
1691 return ctrl->type_ops->validate(ctrl, 0, p_new);
1692 default:
1693 break;
1694 }
1695 }
1696 for (idx = 0; !err && idx < ctrl->elems; idx++)
1697 err = ctrl->type_ops->validate(ctrl, idx, p_new);
1698 return err;
1699 }
1700
1701 static inline u32 node2id(struct list_head *node)
1702 {
1703 return list_entry(node, struct v4l2_ctrl_ref, node)->ctrl->id;
1704 }
1705
1706 /* Set the handler's error code if it wasn't set earlier already */
1707 static inline int handler_set_err(struct v4l2_ctrl_handler *hdl, int err)
1708 {
1709 if (hdl->error == 0)
1710 hdl->error = err;
1711 return err;
1712 }
1713
1714 /* Initialize the handler */
1715 int v4l2_ctrl_handler_init_class(struct v4l2_ctrl_handler *hdl,
1716 unsigned nr_of_controls_hint,
1717 struct lock_class_key *key, const char *name)
1718 {
1719 hdl->lock = &hdl->_lock;
1720 mutex_init(hdl->lock);
1721 lockdep_set_class_and_name(hdl->lock, key, name);
1722 INIT_LIST_HEAD(&hdl->ctrls);
1723 INIT_LIST_HEAD(&hdl->ctrl_refs);
1724 hdl->nr_of_buckets = 1 + nr_of_controls_hint / 8;
1725 hdl->buckets = kcalloc(hdl->nr_of_buckets, sizeof(hdl->buckets[0]),
1726 GFP_KERNEL);
1727 hdl->error = hdl->buckets ? 0 : -ENOMEM;
1728 return hdl->error;
1729 }
1730 EXPORT_SYMBOL(v4l2_ctrl_handler_init_class);
1731
1732 /* Free all controls and control refs */
1733 void v4l2_ctrl_handler_free(struct v4l2_ctrl_handler *hdl)
1734 {
1735 struct v4l2_ctrl_ref *ref, *next_ref;
1736 struct v4l2_ctrl *ctrl, *next_ctrl;
1737 struct v4l2_subscribed_event *sev, *next_sev;
1738
1739 if (hdl == NULL || hdl->buckets == NULL)
1740 return;
1741
1742 mutex_lock(hdl->lock);
1743 /* Free all nodes */
1744 list_for_each_entry_safe(ref, next_ref, &hdl->ctrl_refs, node) {
1745 list_del(&ref->node);
1746 kfree(ref);
1747 }
1748 /* Free all controls owned by the handler */
1749 list_for_each_entry_safe(ctrl, next_ctrl, &hdl->ctrls, node) {
1750 list_del(&ctrl->node);
1751 list_for_each_entry_safe(sev, next_sev, &ctrl->ev_subs, node)
1752 list_del(&sev->node);
1753 kfree(ctrl);
1754 }
1755 kfree(hdl->buckets);
1756 hdl->buckets = NULL;
1757 hdl->cached = NULL;
1758 hdl->error = 0;
1759 mutex_unlock(hdl->lock);
1760 }
1761 EXPORT_SYMBOL(v4l2_ctrl_handler_free);
1762
1763 /* For backwards compatibility: V4L2_CID_PRIVATE_BASE should no longer
1764 be used except in G_CTRL, S_CTRL, QUERYCTRL and QUERYMENU when dealing
1765 with applications that do not use the NEXT_CTRL flag.
1766
1767 We just find the n-th private user control. It's O(N), but that should not
1768 be an issue in this particular case. */
1769 static struct v4l2_ctrl_ref *find_private_ref(
1770 struct v4l2_ctrl_handler *hdl, u32 id)
1771 {
1772 struct v4l2_ctrl_ref *ref;
1773
1774 id -= V4L2_CID_PRIVATE_BASE;
1775 list_for_each_entry(ref, &hdl->ctrl_refs, node) {
1776 /* Search for private user controls that are compatible with
1777 VIDIOC_G/S_CTRL. */
1778 if (V4L2_CTRL_ID2CLASS(ref->ctrl->id) == V4L2_CTRL_CLASS_USER &&
1779 V4L2_CTRL_DRIVER_PRIV(ref->ctrl->id)) {
1780 if (!ref->ctrl->is_int)
1781 continue;
1782 if (id == 0)
1783 return ref;
1784 id--;
1785 }
1786 }
1787 return NULL;
1788 }
1789
1790 /* Find a control with the given ID. */
1791 static struct v4l2_ctrl_ref *find_ref(struct v4l2_ctrl_handler *hdl, u32 id)
1792 {
1793 struct v4l2_ctrl_ref *ref;
1794 int bucket;
1795
1796 id &= V4L2_CTRL_ID_MASK;
1797
1798 /* Old-style private controls need special handling */
1799 if (id >= V4L2_CID_PRIVATE_BASE)
1800 return find_private_ref(hdl, id);
1801 bucket = id % hdl->nr_of_buckets;
1802
1803 /* Simple optimization: cache the last control found */
1804 if (hdl->cached && hdl->cached->ctrl->id == id)
1805 return hdl->cached;
1806
1807 /* Not in cache, search the hash */
1808 ref = hdl->buckets ? hdl->buckets[bucket] : NULL;
1809 while (ref && ref->ctrl->id != id)
1810 ref = ref->next;
1811
1812 if (ref)
1813 hdl->cached = ref; /* cache it! */
1814 return ref;
1815 }
1816
1817 /* Find a control with the given ID. Take the handler's lock first. */
1818 static struct v4l2_ctrl_ref *find_ref_lock(
1819 struct v4l2_ctrl_handler *hdl, u32 id)
1820 {
1821 struct v4l2_ctrl_ref *ref = NULL;
1822
1823 if (hdl) {
1824 mutex_lock(hdl->lock);
1825 ref = find_ref(hdl, id);
1826 mutex_unlock(hdl->lock);
1827 }
1828 return ref;
1829 }
1830
1831 /* Find a control with the given ID. */
1832 struct v4l2_ctrl *v4l2_ctrl_find(struct v4l2_ctrl_handler *hdl, u32 id)
1833 {
1834 struct v4l2_ctrl_ref *ref = find_ref_lock(hdl, id);
1835
1836 return ref ? ref->ctrl : NULL;
1837 }
1838 EXPORT_SYMBOL(v4l2_ctrl_find);
1839
1840 /* Allocate a new v4l2_ctrl_ref and hook it into the handler. */
1841 static int handler_new_ref(struct v4l2_ctrl_handler *hdl,
1842 struct v4l2_ctrl *ctrl)
1843 {
1844 struct v4l2_ctrl_ref *ref;
1845 struct v4l2_ctrl_ref *new_ref;
1846 u32 id = ctrl->id;
1847 u32 class_ctrl = V4L2_CTRL_ID2CLASS(id) | 1;
1848 int bucket = id % hdl->nr_of_buckets; /* which bucket to use */
1849
1850 /*
1851 * Automatically add the control class if it is not yet present and
1852 * the new control is not a compound control.
1853 */
1854 if (ctrl->type < V4L2_CTRL_COMPOUND_TYPES &&
1855 id != class_ctrl && find_ref_lock(hdl, class_ctrl) == NULL)
1856 if (!v4l2_ctrl_new_std(hdl, NULL, class_ctrl, 0, 0, 0, 0))
1857 return hdl->error;
1858
1859 if (hdl->error)
1860 return hdl->error;
1861
1862 new_ref = kzalloc(sizeof(*new_ref), GFP_KERNEL);
1863 if (!new_ref)
1864 return handler_set_err(hdl, -ENOMEM);
1865 new_ref->ctrl = ctrl;
1866 if (ctrl->handler == hdl) {
1867 /* By default each control starts in a cluster of its own.
1868 new_ref->ctrl is basically a cluster array with one
1869 element, so that's perfect to use as the cluster pointer.
1870 But only do this for the handler that owns the control. */
1871 ctrl->cluster = &new_ref->ctrl;
1872 ctrl->ncontrols = 1;
1873 }
1874
1875 INIT_LIST_HEAD(&new_ref->node);
1876
1877 mutex_lock(hdl->lock);
1878
1879 /* Add immediately at the end of the list if the list is empty, or if
1880 the last element in the list has a lower ID.
1881 This ensures that when elements are added in ascending order the
1882 insertion is an O(1) operation. */
1883 if (list_empty(&hdl->ctrl_refs) || id > node2id(hdl->ctrl_refs.prev)) {
1884 list_add_tail(&new_ref->node, &hdl->ctrl_refs);
1885 goto insert_in_hash;
1886 }
1887
1888 /* Find insert position in sorted list */
1889 list_for_each_entry(ref, &hdl->ctrl_refs, node) {
1890 if (ref->ctrl->id < id)
1891 continue;
1892 /* Don't add duplicates */
1893 if (ref->ctrl->id == id) {
1894 kfree(new_ref);
1895 goto unlock;
1896 }
1897 list_add(&new_ref->node, ref->node.prev);
1898 break;
1899 }
1900
1901 insert_in_hash:
1902 /* Insert the control node in the hash */
1903 new_ref->next = hdl->buckets[bucket];
1904 hdl->buckets[bucket] = new_ref;
1905
1906 unlock:
1907 mutex_unlock(hdl->lock);
1908 return 0;
1909 }
1910
1911 /* Add a new control */
1912 static struct v4l2_ctrl *v4l2_ctrl_new(struct v4l2_ctrl_handler *hdl,
1913 const struct v4l2_ctrl_ops *ops,
1914 const struct v4l2_ctrl_type_ops *type_ops,
1915 u32 id, const char *name, enum v4l2_ctrl_type type,
1916 s64 min, s64 max, u64 step, s64 def,
1917 const u32 dims[V4L2_CTRL_MAX_DIMS], u32 elem_size,
1918 u32 flags, const char * const *qmenu,
1919 const s64 *qmenu_int, void *priv)
1920 {
1921 struct v4l2_ctrl *ctrl;
1922 unsigned sz_extra;
1923 unsigned nr_of_dims = 0;
1924 unsigned elems = 1;
1925 bool is_array;
1926 unsigned tot_ctrl_size;
1927 unsigned idx;
1928 void *data;
1929 int err;
1930
1931 if (hdl->error)
1932 return NULL;
1933
1934 while (dims && dims[nr_of_dims]) {
1935 elems *= dims[nr_of_dims];
1936 nr_of_dims++;
1937 if (nr_of_dims == V4L2_CTRL_MAX_DIMS)
1938 break;
1939 }
1940 is_array = nr_of_dims > 0;
1941
1942 /* Prefill elem_size for all types handled by std_type_ops */
1943 switch (type) {
1944 case V4L2_CTRL_TYPE_INTEGER64:
1945 elem_size = sizeof(s64);
1946 break;
1947 case V4L2_CTRL_TYPE_STRING:
1948 elem_size = max + 1;
1949 break;
1950 case V4L2_CTRL_TYPE_U8:
1951 elem_size = sizeof(u8);
1952 break;
1953 case V4L2_CTRL_TYPE_U16:
1954 elem_size = sizeof(u16);
1955 break;
1956 case V4L2_CTRL_TYPE_U32:
1957 elem_size = sizeof(u32);
1958 break;
1959 default:
1960 if (type < V4L2_CTRL_COMPOUND_TYPES)
1961 elem_size = sizeof(s32);
1962 break;
1963 }
1964 tot_ctrl_size = elem_size * elems;
1965
1966 /* Sanity checks */
1967 if (id == 0 || name == NULL || !elem_size ||
1968 id >= V4L2_CID_PRIVATE_BASE ||
1969 (type == V4L2_CTRL_TYPE_MENU && qmenu == NULL) ||
1970 (type == V4L2_CTRL_TYPE_INTEGER_MENU && qmenu_int == NULL)) {
1971 handler_set_err(hdl, -ERANGE);
1972 return NULL;
1973 }
1974 err = check_range(type, min, max, step, def);
1975 if (err) {
1976 handler_set_err(hdl, err);
1977 return NULL;
1978 }
1979 if (type == V4L2_CTRL_TYPE_BITMASK && ((def & ~max) || min || step)) {
1980 handler_set_err(hdl, -ERANGE);
1981 return NULL;
1982 }
1983 if (is_array &&
1984 (type == V4L2_CTRL_TYPE_BUTTON ||
1985 type == V4L2_CTRL_TYPE_CTRL_CLASS)) {
1986 handler_set_err(hdl, -EINVAL);
1987 return NULL;
1988 }
1989
1990 sz_extra = 0;
1991 if (type == V4L2_CTRL_TYPE_BUTTON)
1992 flags |= V4L2_CTRL_FLAG_WRITE_ONLY |
1993 V4L2_CTRL_FLAG_EXECUTE_ON_WRITE;
1994 else if (type == V4L2_CTRL_TYPE_CTRL_CLASS)
1995 flags |= V4L2_CTRL_FLAG_READ_ONLY;
1996 else if (type == V4L2_CTRL_TYPE_INTEGER64 ||
1997 type == V4L2_CTRL_TYPE_STRING ||
1998 type >= V4L2_CTRL_COMPOUND_TYPES ||
1999 is_array)
2000 sz_extra += 2 * tot_ctrl_size;
2001
2002 ctrl = kzalloc(sizeof(*ctrl) + sz_extra, GFP_KERNEL);
2003 if (ctrl == NULL) {
2004 handler_set_err(hdl, -ENOMEM);
2005 return NULL;
2006 }
2007
2008 INIT_LIST_HEAD(&ctrl->node);
2009 INIT_LIST_HEAD(&ctrl->ev_subs);
2010 ctrl->handler = hdl;
2011 ctrl->ops = ops;
2012 ctrl->type_ops = type_ops ? type_ops : &std_type_ops;
2013 ctrl->id = id;
2014 ctrl->name = name;
2015 ctrl->type = type;
2016 ctrl->flags = flags;
2017 ctrl->minimum = min;
2018 ctrl->maximum = max;
2019 ctrl->step = step;
2020 ctrl->default_value = def;
2021 ctrl->is_string = !is_array && type == V4L2_CTRL_TYPE_STRING;
2022 ctrl->is_ptr = is_array || type >= V4L2_CTRL_COMPOUND_TYPES || ctrl->is_string;
2023 ctrl->is_int = !ctrl->is_ptr && type != V4L2_CTRL_TYPE_INTEGER64;
2024 ctrl->is_array = is_array;
2025 ctrl->elems = elems;
2026 ctrl->nr_of_dims = nr_of_dims;
2027 if (nr_of_dims)
2028 memcpy(ctrl->dims, dims, nr_of_dims * sizeof(dims[0]));
2029 ctrl->elem_size = elem_size;
2030 if (type == V4L2_CTRL_TYPE_MENU)
2031 ctrl->qmenu = qmenu;
2032 else if (type == V4L2_CTRL_TYPE_INTEGER_MENU)
2033 ctrl->qmenu_int = qmenu_int;
2034 ctrl->priv = priv;
2035 ctrl->cur.val = ctrl->val = def;
2036 data = &ctrl[1];
2037
2038 if (!ctrl->is_int) {
2039 ctrl->p_new.p = data;
2040 ctrl->p_cur.p = data + tot_ctrl_size;
2041 } else {
2042 ctrl->p_new.p = &ctrl->val;
2043 ctrl->p_cur.p = &ctrl->cur.val;
2044 }
2045 for (idx = 0; idx < elems; idx++) {
2046 ctrl->type_ops->init(ctrl, idx, ctrl->p_cur);
2047 ctrl->type_ops->init(ctrl, idx, ctrl->p_new);
2048 }
2049
2050 if (handler_new_ref(hdl, ctrl)) {
2051 kfree(ctrl);
2052 return NULL;
2053 }
2054 mutex_lock(hdl->lock);
2055 list_add_tail(&ctrl->node, &hdl->ctrls);
2056 mutex_unlock(hdl->lock);
2057 return ctrl;
2058 }
2059
2060 struct v4l2_ctrl *v4l2_ctrl_new_custom(struct v4l2_ctrl_handler *hdl,
2061 const struct v4l2_ctrl_config *cfg, void *priv)
2062 {
2063 bool is_menu;
2064 struct v4l2_ctrl *ctrl;
2065 const char *name = cfg->name;
2066 const char * const *qmenu = cfg->qmenu;
2067 const s64 *qmenu_int = cfg->qmenu_int;
2068 enum v4l2_ctrl_type type = cfg->type;
2069 u32 flags = cfg->flags;
2070 s64 min = cfg->min;
2071 s64 max = cfg->max;
2072 u64 step = cfg->step;
2073 s64 def = cfg->def;
2074
2075 if (name == NULL)
2076 v4l2_ctrl_fill(cfg->id, &name, &type, &min, &max, &step,
2077 &def, &flags);
2078
2079 is_menu = (cfg->type == V4L2_CTRL_TYPE_MENU ||
2080 cfg->type == V4L2_CTRL_TYPE_INTEGER_MENU);
2081 if (is_menu)
2082 WARN_ON(step);
2083 else
2084 WARN_ON(cfg->menu_skip_mask);
2085 if (cfg->type == V4L2_CTRL_TYPE_MENU && qmenu == NULL)
2086 qmenu = v4l2_ctrl_get_menu(cfg->id);
2087 else if (cfg->type == V4L2_CTRL_TYPE_INTEGER_MENU &&
2088 qmenu_int == NULL) {
2089 handler_set_err(hdl, -EINVAL);
2090 return NULL;
2091 }
2092
2093 ctrl = v4l2_ctrl_new(hdl, cfg->ops, cfg->type_ops, cfg->id, name,
2094 type, min, max,
2095 is_menu ? cfg->menu_skip_mask : step, def,
2096 cfg->dims, cfg->elem_size,
2097 flags, qmenu, qmenu_int, priv);
2098 if (ctrl)
2099 ctrl->is_private = cfg->is_private;
2100 return ctrl;
2101 }
2102 EXPORT_SYMBOL(v4l2_ctrl_new_custom);
2103
2104 /* Helper function for standard non-menu controls */
2105 struct v4l2_ctrl *v4l2_ctrl_new_std(struct v4l2_ctrl_handler *hdl,
2106 const struct v4l2_ctrl_ops *ops,
2107 u32 id, s64 min, s64 max, u64 step, s64 def)
2108 {
2109 const char *name;
2110 enum v4l2_ctrl_type type;
2111 u32 flags;
2112
2113 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
2114 if (type == V4L2_CTRL_TYPE_MENU ||
2115 type == V4L2_CTRL_TYPE_INTEGER_MENU ||
2116 type >= V4L2_CTRL_COMPOUND_TYPES) {
2117 handler_set_err(hdl, -EINVAL);
2118 return NULL;
2119 }
2120 return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
2121 min, max, step, def, NULL, 0,
2122 flags, NULL, NULL, NULL);
2123 }
2124 EXPORT_SYMBOL(v4l2_ctrl_new_std);
2125
2126 /* Helper function for standard menu controls */
2127 struct v4l2_ctrl *v4l2_ctrl_new_std_menu(struct v4l2_ctrl_handler *hdl,
2128 const struct v4l2_ctrl_ops *ops,
2129 u32 id, u8 _max, u64 mask, u8 _def)
2130 {
2131 const char * const *qmenu = NULL;
2132 const s64 *qmenu_int = NULL;
2133 unsigned int qmenu_int_len = 0;
2134 const char *name;
2135 enum v4l2_ctrl_type type;
2136 s64 min;
2137 s64 max = _max;
2138 s64 def = _def;
2139 u64 step;
2140 u32 flags;
2141
2142 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
2143
2144 if (type == V4L2_CTRL_TYPE_MENU)
2145 qmenu = v4l2_ctrl_get_menu(id);
2146 else if (type == V4L2_CTRL_TYPE_INTEGER_MENU)
2147 qmenu_int = v4l2_ctrl_get_int_menu(id, &qmenu_int_len);
2148
2149 if ((!qmenu && !qmenu_int) || (qmenu_int && max > qmenu_int_len)) {
2150 handler_set_err(hdl, -EINVAL);
2151 return NULL;
2152 }
2153 return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
2154 0, max, mask, def, NULL, 0,
2155 flags, qmenu, qmenu_int, NULL);
2156 }
2157 EXPORT_SYMBOL(v4l2_ctrl_new_std_menu);
2158
2159 /* Helper function for standard menu controls with driver defined menu */
2160 struct v4l2_ctrl *v4l2_ctrl_new_std_menu_items(struct v4l2_ctrl_handler *hdl,
2161 const struct v4l2_ctrl_ops *ops, u32 id, u8 _max,
2162 u64 mask, u8 _def, const char * const *qmenu)
2163 {
2164 enum v4l2_ctrl_type type;
2165 const char *name;
2166 u32 flags;
2167 u64 step;
2168 s64 min;
2169 s64 max = _max;
2170 s64 def = _def;
2171
2172 /* v4l2_ctrl_new_std_menu_items() should only be called for
2173 * standard controls without a standard menu.
2174 */
2175 if (v4l2_ctrl_get_menu(id)) {
2176 handler_set_err(hdl, -EINVAL);
2177 return NULL;
2178 }
2179
2180 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
2181 if (type != V4L2_CTRL_TYPE_MENU || qmenu == NULL) {
2182 handler_set_err(hdl, -EINVAL);
2183 return NULL;
2184 }
2185 return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
2186 0, max, mask, def, NULL, 0,
2187 flags, qmenu, NULL, NULL);
2188
2189 }
2190 EXPORT_SYMBOL(v4l2_ctrl_new_std_menu_items);
2191
2192 /* Helper function for standard integer menu controls */
2193 struct v4l2_ctrl *v4l2_ctrl_new_int_menu(struct v4l2_ctrl_handler *hdl,
2194 const struct v4l2_ctrl_ops *ops,
2195 u32 id, u8 _max, u8 _def, const s64 *qmenu_int)
2196 {
2197 const char *name;
2198 enum v4l2_ctrl_type type;
2199 s64 min;
2200 u64 step;
2201 s64 max = _max;
2202 s64 def = _def;
2203 u32 flags;
2204
2205 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
2206 if (type != V4L2_CTRL_TYPE_INTEGER_MENU) {
2207 handler_set_err(hdl, -EINVAL);
2208 return NULL;
2209 }
2210 return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
2211 0, max, 0, def, NULL, 0,
2212 flags, NULL, qmenu_int, NULL);
2213 }
2214 EXPORT_SYMBOL(v4l2_ctrl_new_int_menu);
2215
2216 /* Add a control from another handler to this handler */
2217 struct v4l2_ctrl *v4l2_ctrl_add_ctrl(struct v4l2_ctrl_handler *hdl,
2218 struct v4l2_ctrl *ctrl)
2219 {
2220 if (hdl == NULL || hdl->error)
2221 return NULL;
2222 if (ctrl == NULL) {
2223 handler_set_err(hdl, -EINVAL);
2224 return NULL;
2225 }
2226 if (ctrl->handler == hdl)
2227 return ctrl;
2228 return handler_new_ref(hdl, ctrl) ? NULL : ctrl;
2229 }
2230 EXPORT_SYMBOL(v4l2_ctrl_add_ctrl);
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_ID2CLASS(ctrl->id) == V4L2_CTRL_CLASS_FM_TX)
2270 return true;
2271 if (V4L2_CTRL_ID2CLASS(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 =
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 =
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 int v4l2_subdev_queryctrl(struct v4l2_subdev *sd, struct v4l2_queryctrl *qc)
2610 {
2611 if (qc->id & (V4L2_CTRL_FLAG_NEXT_CTRL | V4L2_CTRL_FLAG_NEXT_COMPOUND))
2612 return -EINVAL;
2613 return v4l2_queryctrl(sd->ctrl_handler, qc);
2614 }
2615 EXPORT_SYMBOL(v4l2_subdev_queryctrl);
2616
2617 /* Implement VIDIOC_QUERYMENU */
2618 int v4l2_querymenu(struct v4l2_ctrl_handler *hdl, struct v4l2_querymenu *qm)
2619 {
2620 struct v4l2_ctrl *ctrl;
2621 u32 i = qm->index;
2622
2623 ctrl = v4l2_ctrl_find(hdl, qm->id);
2624 if (!ctrl)
2625 return -EINVAL;
2626
2627 qm->reserved = 0;
2628 /* Sanity checks */
2629 switch (ctrl->type) {
2630 case V4L2_CTRL_TYPE_MENU:
2631 if (ctrl->qmenu == NULL)
2632 return -EINVAL;
2633 break;
2634 case V4L2_CTRL_TYPE_INTEGER_MENU:
2635 if (ctrl->qmenu_int == NULL)
2636 return -EINVAL;
2637 break;
2638 default:
2639 return -EINVAL;
2640 }
2641
2642 if (i < ctrl->minimum || i > ctrl->maximum)
2643 return -EINVAL;
2644
2645 /* Use mask to see if this menu item should be skipped */
2646 if (ctrl->menu_skip_mask & (1 << i))
2647 return -EINVAL;
2648 /* Empty menu items should also be skipped */
2649 if (ctrl->type == V4L2_CTRL_TYPE_MENU) {
2650 if (ctrl->qmenu[i] == NULL || ctrl->qmenu[i][0] == '\0')
2651 return -EINVAL;
2652 strlcpy(qm->name, ctrl->qmenu[i], sizeof(qm->name));
2653 } else {
2654 qm->value = ctrl->qmenu_int[i];
2655 }
2656 return 0;
2657 }
2658 EXPORT_SYMBOL(v4l2_querymenu);
2659
2660 int v4l2_subdev_querymenu(struct v4l2_subdev *sd, struct v4l2_querymenu *qm)
2661 {
2662 return v4l2_querymenu(sd->ctrl_handler, qm);
2663 }
2664 EXPORT_SYMBOL(v4l2_subdev_querymenu);
2665
2666
2667
2668 /* Some general notes on the atomic requirements of VIDIOC_G/TRY/S_EXT_CTRLS:
2669
2670 It is not a fully atomic operation, just best-effort only. After all, if
2671 multiple controls have to be set through multiple i2c writes (for example)
2672 then some initial writes may succeed while others fail. Thus leaving the
2673 system in an inconsistent state. The question is how much effort you are
2674 willing to spend on trying to make something atomic that really isn't.
2675
2676 From the point of view of an application the main requirement is that
2677 when you call VIDIOC_S_EXT_CTRLS and some values are invalid then an
2678 error should be returned without actually affecting any controls.
2679
2680 If all the values are correct, then it is acceptable to just give up
2681 in case of low-level errors.
2682
2683 It is important though that the application can tell when only a partial
2684 configuration was done. The way we do that is through the error_idx field
2685 of struct v4l2_ext_controls: if that is equal to the count field then no
2686 controls were affected. Otherwise all controls before that index were
2687 successful in performing their 'get' or 'set' operation, the control at
2688 the given index failed, and you don't know what happened with the controls
2689 after the failed one. Since if they were part of a control cluster they
2690 could have been successfully processed (if a cluster member was encountered
2691 at index < error_idx), they could have failed (if a cluster member was at
2692 error_idx), or they may not have been processed yet (if the first cluster
2693 member appeared after error_idx).
2694
2695 It is all fairly theoretical, though. In practice all you can do is to
2696 bail out. If error_idx == count, then it is an application bug. If
2697 error_idx < count then it is only an application bug if the error code was
2698 EBUSY. That usually means that something started streaming just when you
2699 tried to set the controls. In all other cases it is a driver/hardware
2700 problem and all you can do is to retry or bail out.
2701
2702 Note that these rules do not apply to VIDIOC_TRY_EXT_CTRLS: since that
2703 never modifies controls the error_idx is just set to whatever control
2704 has an invalid value.
2705 */
2706
2707 /* Prepare for the extended g/s/try functions.
2708 Find the controls in the control array and do some basic checks. */
2709 static int prepare_ext_ctrls(struct v4l2_ctrl_handler *hdl,
2710 struct v4l2_ext_controls *cs,
2711 struct v4l2_ctrl_helper *helpers,
2712 bool get)
2713 {
2714 struct v4l2_ctrl_helper *h;
2715 bool have_clusters = false;
2716 u32 i;
2717
2718 for (i = 0, h = helpers; i < cs->count; i++, h++) {
2719 struct v4l2_ext_control *c = &cs->controls[i];
2720 struct v4l2_ctrl_ref *ref;
2721 struct v4l2_ctrl *ctrl;
2722 u32 id = c->id & V4L2_CTRL_ID_MASK;
2723
2724 cs->error_idx = i;
2725
2726 if (cs->ctrl_class && V4L2_CTRL_ID2CLASS(id) != cs->ctrl_class)
2727 return -EINVAL;
2728
2729 /* Old-style private controls are not allowed for
2730 extended controls */
2731 if (id >= V4L2_CID_PRIVATE_BASE)
2732 return -EINVAL;
2733 ref = find_ref_lock(hdl, id);
2734 if (ref == NULL)
2735 return -EINVAL;
2736 ctrl = ref->ctrl;
2737 if (ctrl->flags & V4L2_CTRL_FLAG_DISABLED)
2738 return -EINVAL;
2739
2740 if (ctrl->cluster[0]->ncontrols > 1)
2741 have_clusters = true;
2742 if (ctrl->cluster[0] != ctrl)
2743 ref = find_ref_lock(hdl, ctrl->cluster[0]->id);
2744 if (ctrl->is_ptr && !ctrl->is_string) {
2745 unsigned tot_size = ctrl->elems * ctrl->elem_size;
2746
2747 if (c->size < tot_size) {
2748 if (get) {
2749 c->size = tot_size;
2750 return -ENOSPC;
2751 }
2752 return -EFAULT;
2753 }
2754 c->size = tot_size;
2755 }
2756 /* Store the ref to the master control of the cluster */
2757 h->mref = ref;
2758 h->ctrl = ctrl;
2759 /* Initially set next to 0, meaning that there is no other
2760 control in this helper array belonging to the same
2761 cluster */
2762 h->next = 0;
2763 }
2764
2765 /* We are done if there were no controls that belong to a multi-
2766 control cluster. */
2767 if (!have_clusters)
2768 return 0;
2769
2770 /* The code below figures out in O(n) time which controls in the list
2771 belong to the same cluster. */
2772
2773 /* This has to be done with the handler lock taken. */
2774 mutex_lock(hdl->lock);
2775
2776 /* First zero the helper field in the master control references */
2777 for (i = 0; i < cs->count; i++)
2778 helpers[i].mref->helper = NULL;
2779 for (i = 0, h = helpers; i < cs->count; i++, h++) {
2780 struct v4l2_ctrl_ref *mref = h->mref;
2781
2782 /* If the mref->helper is set, then it points to an earlier
2783 helper that belongs to the same cluster. */
2784 if (mref->helper) {
2785 /* Set the next field of mref->helper to the current
2786 index: this means that that earlier helper now
2787 points to the next helper in the same cluster. */
2788 mref->helper->next = i;
2789 /* mref should be set only for the first helper in the
2790 cluster, clear the others. */
2791 h->mref = NULL;
2792 }
2793 /* Point the mref helper to the current helper struct. */
2794 mref->helper = h;
2795 }
2796 mutex_unlock(hdl->lock);
2797 return 0;
2798 }
2799
2800 /* Handles the corner case where cs->count == 0. It checks whether the
2801 specified control class exists. If that class ID is 0, then it checks
2802 whether there are any controls at all. */
2803 static int class_check(struct v4l2_ctrl_handler *hdl, u32 ctrl_class)
2804 {
2805 if (ctrl_class == 0)
2806 return list_empty(&hdl->ctrl_refs) ? -EINVAL : 0;
2807 return find_ref_lock(hdl, ctrl_class | 1) ? 0 : -EINVAL;
2808 }
2809
2810
2811
2812 /* Get extended controls. Allocates the helpers array if needed. */
2813 int v4l2_g_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *cs)
2814 {
2815 struct v4l2_ctrl_helper helper[4];
2816 struct v4l2_ctrl_helper *helpers = helper;
2817 int ret;
2818 int i, j;
2819
2820 cs->error_idx = cs->count;
2821 cs->ctrl_class = V4L2_CTRL_ID2CLASS(cs->ctrl_class);
2822
2823 if (hdl == NULL)
2824 return -EINVAL;
2825
2826 if (cs->count == 0)
2827 return class_check(hdl, cs->ctrl_class);
2828
2829 if (cs->count > ARRAY_SIZE(helper)) {
2830 helpers = kmalloc_array(cs->count, sizeof(helper[0]),
2831 GFP_KERNEL);
2832 if (helpers == NULL)
2833 return -ENOMEM;
2834 }
2835
2836 ret = prepare_ext_ctrls(hdl, cs, helpers, true);
2837 cs->error_idx = cs->count;
2838
2839 for (i = 0; !ret && i < cs->count; i++)
2840 if (helpers[i].ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY)
2841 ret = -EACCES;
2842
2843 for (i = 0; !ret && i < cs->count; i++) {
2844 int (*ctrl_to_user)(struct v4l2_ext_control *c,
2845 struct v4l2_ctrl *ctrl) = cur_to_user;
2846 struct v4l2_ctrl *master;
2847
2848 if (helpers[i].mref == NULL)
2849 continue;
2850
2851 master = helpers[i].mref->ctrl;
2852 cs->error_idx = i;
2853
2854 v4l2_ctrl_lock(master);
2855
2856 /* g_volatile_ctrl will update the new control values */
2857 if ((master->flags & V4L2_CTRL_FLAG_VOLATILE) ||
2858 (master->has_volatiles && !is_cur_manual(master))) {
2859 for (j = 0; j < master->ncontrols; j++)
2860 cur_to_new(master->cluster[j]);
2861 ret = call_op(master, g_volatile_ctrl);
2862 ctrl_to_user = new_to_user;
2863 }
2864 /* If OK, then copy the current (for non-volatile controls)
2865 or the new (for volatile controls) control values to the
2866 caller */
2867 if (!ret) {
2868 u32 idx = i;
2869
2870 do {
2871 ret = ctrl_to_user(cs->controls + idx,
2872 helpers[idx].ctrl);
2873 idx = helpers[idx].next;
2874 } while (!ret && idx);
2875 }
2876 v4l2_ctrl_unlock(master);
2877 }
2878
2879 if (cs->count > ARRAY_SIZE(helper))
2880 kfree(helpers);
2881 return ret;
2882 }
2883 EXPORT_SYMBOL(v4l2_g_ext_ctrls);
2884
2885 int v4l2_subdev_g_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs)
2886 {
2887 return v4l2_g_ext_ctrls(sd->ctrl_handler, cs);
2888 }
2889 EXPORT_SYMBOL(v4l2_subdev_g_ext_ctrls);
2890
2891 /* Helper function to get a single control */
2892 static int get_ctrl(struct v4l2_ctrl *ctrl, struct v4l2_ext_control *c)
2893 {
2894 struct v4l2_ctrl *master = ctrl->cluster[0];
2895 int ret = 0;
2896 int i;
2897
2898 /* Compound controls are not supported. The new_to_user() and
2899 * cur_to_user() calls below would need to be modified not to access
2900 * userspace memory when called from get_ctrl().
2901 */
2902 if (!ctrl->is_int)
2903 return -EINVAL;
2904
2905 if (ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY)
2906 return -EACCES;
2907
2908 v4l2_ctrl_lock(master);
2909 /* g_volatile_ctrl will update the current control values */
2910 if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE) {
2911 for (i = 0; i < master->ncontrols; i++)
2912 cur_to_new(master->cluster[i]);
2913 ret = call_op(master, g_volatile_ctrl);
2914 new_to_user(c, ctrl);
2915 } else {
2916 cur_to_user(c, ctrl);
2917 }
2918 v4l2_ctrl_unlock(master);
2919 return ret;
2920 }
2921
2922 int v4l2_g_ctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_control *control)
2923 {
2924 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, control->id);
2925 struct v4l2_ext_control c;
2926 int ret;
2927
2928 if (ctrl == NULL || !ctrl->is_int)
2929 return -EINVAL;
2930 ret = get_ctrl(ctrl, &c);
2931 control->value = c.value;
2932 return ret;
2933 }
2934 EXPORT_SYMBOL(v4l2_g_ctrl);
2935
2936 int v4l2_subdev_g_ctrl(struct v4l2_subdev *sd, struct v4l2_control *control)
2937 {
2938 return v4l2_g_ctrl(sd->ctrl_handler, control);
2939 }
2940 EXPORT_SYMBOL(v4l2_subdev_g_ctrl);
2941
2942 s32 v4l2_ctrl_g_ctrl(struct v4l2_ctrl *ctrl)
2943 {
2944 struct v4l2_ext_control c;
2945
2946 /* It's a driver bug if this happens. */
2947 WARN_ON(!ctrl->is_int);
2948 c.value = 0;
2949 get_ctrl(ctrl, &c);
2950 return c.value;
2951 }
2952 EXPORT_SYMBOL(v4l2_ctrl_g_ctrl);
2953
2954 s64 v4l2_ctrl_g_ctrl_int64(struct v4l2_ctrl *ctrl)
2955 {
2956 struct v4l2_ext_control c;
2957
2958 /* It's a driver bug if this happens. */
2959 WARN_ON(ctrl->is_ptr || ctrl->type != V4L2_CTRL_TYPE_INTEGER64);
2960 c.value = 0;
2961 get_ctrl(ctrl, &c);
2962 return c.value;
2963 }
2964 EXPORT_SYMBOL(v4l2_ctrl_g_ctrl_int64);
2965
2966
2967 /* Core function that calls try/s_ctrl and ensures that the new value is
2968 copied to the current value on a set.
2969 Must be called with ctrl->handler->lock held. */
2970 static int try_or_set_cluster(struct v4l2_fh *fh, struct v4l2_ctrl *master,
2971 bool set, u32 ch_flags)
2972 {
2973 bool update_flag;
2974 int ret;
2975 int i;
2976
2977 /* Go through the cluster and either validate the new value or
2978 (if no new value was set), copy the current value to the new
2979 value, ensuring a consistent view for the control ops when
2980 called. */
2981 for (i = 0; i < master->ncontrols; i++) {
2982 struct v4l2_ctrl *ctrl = master->cluster[i];
2983
2984 if (ctrl == NULL)
2985 continue;
2986
2987 if (!ctrl->is_new) {
2988 cur_to_new(ctrl);
2989 continue;
2990 }
2991 /* Check again: it may have changed since the
2992 previous check in try_or_set_ext_ctrls(). */
2993 if (set && (ctrl->flags & V4L2_CTRL_FLAG_GRABBED))
2994 return -EBUSY;
2995 }
2996
2997 ret = call_op(master, try_ctrl);
2998
2999 /* Don't set if there is no change */
3000 if (ret || !set || !cluster_changed(master))
3001 return ret;
3002 ret = call_op(master, s_ctrl);
3003 if (ret)
3004 return ret;
3005
3006 /* If OK, then make the new values permanent. */
3007 update_flag = is_cur_manual(master) != is_new_manual(master);
3008 for (i = 0; i < master->ncontrols; i++)
3009 new_to_cur(fh, master->cluster[i], ch_flags |
3010 ((update_flag && i > 0) ? V4L2_EVENT_CTRL_CH_FLAGS : 0));
3011 return 0;
3012 }
3013
3014 /* Validate controls. */
3015 static int validate_ctrls(struct v4l2_ext_controls *cs,
3016 struct v4l2_ctrl_helper *helpers, bool set)
3017 {
3018 unsigned i;
3019 int ret = 0;
3020
3021 cs->error_idx = cs->count;
3022 for (i = 0; i < cs->count; i++) {
3023 struct v4l2_ctrl *ctrl = helpers[i].ctrl;
3024 union v4l2_ctrl_ptr p_new;
3025
3026 cs->error_idx = i;
3027
3028 if (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY)
3029 return -EACCES;
3030 /* This test is also done in try_set_control_cluster() which
3031 is called in atomic context, so that has the final say,
3032 but it makes sense to do an up-front check as well. Once
3033 an error occurs in try_set_control_cluster() some other
3034 controls may have been set already and we want to do a
3035 best-effort to avoid that. */
3036 if (set && (ctrl->flags & V4L2_CTRL_FLAG_GRABBED))
3037 return -EBUSY;
3038 /*
3039 * Skip validation for now if the payload needs to be copied
3040 * from userspace into kernelspace. We'll validate those later.
3041 */
3042 if (ctrl->is_ptr)
3043 continue;
3044 if (ctrl->type == V4L2_CTRL_TYPE_INTEGER64)
3045 p_new.p_s64 = &cs->controls[i].value64;
3046 else
3047 p_new.p_s32 = &cs->controls[i].value;
3048 ret = validate_new(ctrl, p_new);
3049 if (ret)
3050 return ret;
3051 }
3052 return 0;
3053 }
3054
3055 /* Obtain the current volatile values of an autocluster and mark them
3056 as new. */
3057 static void update_from_auto_cluster(struct v4l2_ctrl *master)
3058 {
3059 int i;
3060
3061 for (i = 0; i < master->ncontrols; i++)
3062 cur_to_new(master->cluster[i]);
3063 if (!call_op(master, g_volatile_ctrl))
3064 for (i = 1; i < master->ncontrols; i++)
3065 if (master->cluster[i])
3066 master->cluster[i]->is_new = 1;
3067 }
3068
3069 /* Try or try-and-set controls */
3070 static int try_set_ext_ctrls(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
3071 struct v4l2_ext_controls *cs,
3072 bool set)
3073 {
3074 struct v4l2_ctrl_helper helper[4];
3075 struct v4l2_ctrl_helper *helpers = helper;
3076 unsigned i, j;
3077 int ret;
3078
3079 cs->error_idx = cs->count;
3080 cs->ctrl_class = V4L2_CTRL_ID2CLASS(cs->ctrl_class);
3081
3082 if (hdl == NULL)
3083 return -EINVAL;
3084
3085 if (cs->count == 0)
3086 return class_check(hdl, cs->ctrl_class);
3087
3088 if (cs->count > ARRAY_SIZE(helper)) {
3089 helpers = kmalloc_array(cs->count, sizeof(helper[0]),
3090 GFP_KERNEL);
3091 if (!helpers)
3092 return -ENOMEM;
3093 }
3094 ret = prepare_ext_ctrls(hdl, cs, helpers, false);
3095 if (!ret)
3096 ret = validate_ctrls(cs, helpers, set);
3097 if (ret && set)
3098 cs->error_idx = cs->count;
3099 for (i = 0; !ret && i < cs->count; i++) {
3100 struct v4l2_ctrl *master;
3101 u32 idx = i;
3102
3103 if (helpers[i].mref == NULL)
3104 continue;
3105
3106 cs->error_idx = i;
3107 master = helpers[i].mref->ctrl;
3108 v4l2_ctrl_lock(master);
3109
3110 /* Reset the 'is_new' flags of the cluster */
3111 for (j = 0; j < master->ncontrols; j++)
3112 if (master->cluster[j])
3113 master->cluster[j]->is_new = 0;
3114
3115 /* For volatile autoclusters that are currently in auto mode
3116 we need to discover if it will be set to manual mode.
3117 If so, then we have to copy the current volatile values
3118 first since those will become the new manual values (which
3119 may be overwritten by explicit new values from this set
3120 of controls). */
3121 if (master->is_auto && master->has_volatiles &&
3122 !is_cur_manual(master)) {
3123 /* Pick an initial non-manual value */
3124 s32 new_auto_val = master->manual_mode_value + 1;
3125 u32 tmp_idx = idx;
3126
3127 do {
3128 /* Check if the auto control is part of the
3129 list, and remember the new value. */
3130 if (helpers[tmp_idx].ctrl == master)
3131 new_auto_val = cs->controls[tmp_idx].value;
3132 tmp_idx = helpers[tmp_idx].next;
3133 } while (tmp_idx);
3134 /* If the new value == the manual value, then copy
3135 the current volatile values. */
3136 if (new_auto_val == master->manual_mode_value)
3137 update_from_auto_cluster(master);
3138 }
3139
3140 /* Copy the new caller-supplied control values.
3141 user_to_new() sets 'is_new' to 1. */
3142 do {
3143 struct v4l2_ctrl *ctrl = helpers[idx].ctrl;
3144
3145 ret = user_to_new(cs->controls + idx, ctrl);
3146 if (!ret && ctrl->is_ptr)
3147 ret = validate_new(ctrl, ctrl->p_new);
3148 idx = helpers[idx].next;
3149 } while (!ret && idx);
3150
3151 if (!ret)
3152 ret = try_or_set_cluster(fh, master, set, 0);
3153
3154 /* Copy the new values back to userspace. */
3155 if (!ret) {
3156 idx = i;
3157 do {
3158 ret = new_to_user(cs->controls + idx,
3159 helpers[idx].ctrl);
3160 idx = helpers[idx].next;
3161 } while (!ret && idx);
3162 }
3163 v4l2_ctrl_unlock(master);
3164 }
3165
3166 if (cs->count > ARRAY_SIZE(helper))
3167 kfree(helpers);
3168 return ret;
3169 }
3170
3171 int v4l2_try_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *cs)
3172 {
3173 return try_set_ext_ctrls(NULL, hdl, cs, false);
3174 }
3175 EXPORT_SYMBOL(v4l2_try_ext_ctrls);
3176
3177 int v4l2_s_ext_ctrls(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
3178 struct v4l2_ext_controls *cs)
3179 {
3180 return try_set_ext_ctrls(fh, hdl, cs, true);
3181 }
3182 EXPORT_SYMBOL(v4l2_s_ext_ctrls);
3183
3184 int v4l2_subdev_try_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs)
3185 {
3186 return try_set_ext_ctrls(NULL, sd->ctrl_handler, cs, false);
3187 }
3188 EXPORT_SYMBOL(v4l2_subdev_try_ext_ctrls);
3189
3190 int v4l2_subdev_s_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs)
3191 {
3192 return try_set_ext_ctrls(NULL, sd->ctrl_handler, cs, true);
3193 }
3194 EXPORT_SYMBOL(v4l2_subdev_s_ext_ctrls);
3195
3196 /* Helper function for VIDIOC_S_CTRL compatibility */
3197 static int set_ctrl(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, u32 ch_flags)
3198 {
3199 struct v4l2_ctrl *master = ctrl->cluster[0];
3200 int ret;
3201 int i;
3202
3203 /* Reset the 'is_new' flags of the cluster */
3204 for (i = 0; i < master->ncontrols; i++)
3205 if (master->cluster[i])
3206 master->cluster[i]->is_new = 0;
3207
3208 ret = validate_new(ctrl, ctrl->p_new);
3209 if (ret)
3210 return ret;
3211
3212 /* For autoclusters with volatiles that are switched from auto to
3213 manual mode we have to update the current volatile values since
3214 those will become the initial manual values after such a switch. */
3215 if (master->is_auto && master->has_volatiles && ctrl == master &&
3216 !is_cur_manual(master) && ctrl->val == master->manual_mode_value)
3217 update_from_auto_cluster(master);
3218
3219 ctrl->is_new = 1;
3220 return try_or_set_cluster(fh, master, true, ch_flags);
3221 }
3222
3223 /* Helper function for VIDIOC_S_CTRL compatibility */
3224 static int set_ctrl_lock(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl,
3225 struct v4l2_ext_control *c)
3226 {
3227 int ret;
3228
3229 v4l2_ctrl_lock(ctrl);
3230 user_to_new(c, ctrl);
3231 ret = set_ctrl(fh, ctrl, 0);
3232 if (!ret)
3233 cur_to_user(c, ctrl);
3234 v4l2_ctrl_unlock(ctrl);
3235 return ret;
3236 }
3237
3238 int v4l2_s_ctrl(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
3239 struct v4l2_control *control)
3240 {
3241 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, control->id);
3242 struct v4l2_ext_control c = { control->id };
3243 int ret;
3244
3245 if (ctrl == NULL || !ctrl->is_int)
3246 return -EINVAL;
3247
3248 if (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY)
3249 return -EACCES;
3250
3251 c.value = control->value;
3252 ret = set_ctrl_lock(fh, ctrl, &c);
3253 control->value = c.value;
3254 return ret;
3255 }
3256 EXPORT_SYMBOL(v4l2_s_ctrl);
3257
3258 int v4l2_subdev_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *control)
3259 {
3260 return v4l2_s_ctrl(NULL, sd->ctrl_handler, control);
3261 }
3262 EXPORT_SYMBOL(v4l2_subdev_s_ctrl);
3263
3264 int __v4l2_ctrl_s_ctrl(struct v4l2_ctrl *ctrl, s32 val)
3265 {
3266 lockdep_assert_held(ctrl->handler->lock);
3267
3268 /* It's a driver bug if this happens. */
3269 WARN_ON(!ctrl->is_int);
3270 ctrl->val = val;
3271 return set_ctrl(NULL, ctrl, 0);
3272 }
3273 EXPORT_SYMBOL(__v4l2_ctrl_s_ctrl);
3274
3275 int __v4l2_ctrl_s_ctrl_int64(struct v4l2_ctrl *ctrl, s64 val)
3276 {
3277 lockdep_assert_held(ctrl->handler->lock);
3278
3279 /* It's a driver bug if this happens. */
3280 WARN_ON(ctrl->is_ptr || ctrl->type != V4L2_CTRL_TYPE_INTEGER64);
3281 *ctrl->p_new.p_s64 = val;
3282 return set_ctrl(NULL, ctrl, 0);
3283 }
3284 EXPORT_SYMBOL(__v4l2_ctrl_s_ctrl_int64);
3285
3286 int __v4l2_ctrl_s_ctrl_string(struct v4l2_ctrl *ctrl, const char *s)
3287 {
3288 lockdep_assert_held(ctrl->handler->lock);
3289
3290 /* It's a driver bug if this happens. */
3291 WARN_ON(ctrl->type != V4L2_CTRL_TYPE_STRING);
3292 strlcpy(ctrl->p_new.p_char, s, ctrl->maximum + 1);
3293 return set_ctrl(NULL, ctrl, 0);
3294 }
3295 EXPORT_SYMBOL(__v4l2_ctrl_s_ctrl_string);
3296
3297 void v4l2_ctrl_notify(struct v4l2_ctrl *ctrl, v4l2_ctrl_notify_fnc notify, void *priv)
3298 {
3299 if (ctrl == NULL)
3300 return;
3301 if (notify == NULL) {
3302 ctrl->call_notify = 0;
3303 return;
3304 }
3305 if (WARN_ON(ctrl->handler->notify && ctrl->handler->notify != notify))
3306 return;
3307 ctrl->handler->notify = notify;
3308 ctrl->handler->notify_priv = priv;
3309 ctrl->call_notify = 1;
3310 }
3311 EXPORT_SYMBOL(v4l2_ctrl_notify);
3312
3313 int __v4l2_ctrl_modify_range(struct v4l2_ctrl *ctrl,
3314 s64 min, s64 max, u64 step, s64 def)
3315 {
3316 bool changed;
3317 int ret;
3318
3319 lockdep_assert_held(ctrl->handler->lock);
3320
3321 switch (ctrl->type) {
3322 case V4L2_CTRL_TYPE_INTEGER:
3323 case V4L2_CTRL_TYPE_INTEGER64:
3324 case V4L2_CTRL_TYPE_BOOLEAN:
3325 case V4L2_CTRL_TYPE_MENU:
3326 case V4L2_CTRL_TYPE_INTEGER_MENU:
3327 case V4L2_CTRL_TYPE_BITMASK:
3328 case V4L2_CTRL_TYPE_U8:
3329 case V4L2_CTRL_TYPE_U16:
3330 case V4L2_CTRL_TYPE_U32:
3331 if (ctrl->is_array)
3332 return -EINVAL;
3333 ret = check_range(ctrl->type, min, max, step, def);
3334 if (ret)
3335 return ret;
3336 break;
3337 default:
3338 return -EINVAL;
3339 }
3340 ctrl->minimum = min;
3341 ctrl->maximum = max;
3342 ctrl->step = step;
3343 ctrl->default_value = def;
3344 cur_to_new(ctrl);
3345 if (validate_new(ctrl, ctrl->p_new)) {
3346 if (ctrl->type == V4L2_CTRL_TYPE_INTEGER64)
3347 *ctrl->p_new.p_s64 = def;
3348 else
3349 *ctrl->p_new.p_s32 = def;
3350 }
3351
3352 if (ctrl->type == V4L2_CTRL_TYPE_INTEGER64)
3353 changed = *ctrl->p_new.p_s64 != *ctrl->p_cur.p_s64;
3354 else
3355 changed = *ctrl->p_new.p_s32 != *ctrl->p_cur.p_s32;
3356 if (changed)
3357 ret = set_ctrl(NULL, ctrl, V4L2_EVENT_CTRL_CH_RANGE);
3358 else
3359 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_RANGE);
3360 return ret;
3361 }
3362 EXPORT_SYMBOL(__v4l2_ctrl_modify_range);
3363
3364 static int v4l2_ctrl_add_event(struct v4l2_subscribed_event *sev, unsigned elems)
3365 {
3366 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(sev->fh->ctrl_handler, sev->id);
3367
3368 if (ctrl == NULL)
3369 return -EINVAL;
3370
3371 v4l2_ctrl_lock(ctrl);
3372 list_add_tail(&sev->node, &ctrl->ev_subs);
3373 if (ctrl->type != V4L2_CTRL_TYPE_CTRL_CLASS &&
3374 (sev->flags & V4L2_EVENT_SUB_FL_SEND_INITIAL)) {
3375 struct v4l2_event ev;
3376 u32 changes = V4L2_EVENT_CTRL_CH_FLAGS;
3377
3378 if (!(ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY))
3379 changes |= V4L2_EVENT_CTRL_CH_VALUE;
3380 fill_event(&ev, ctrl, changes);
3381 /* Mark the queue as active, allowing this initial
3382 event to be accepted. */
3383 sev->elems = elems;
3384 v4l2_event_queue_fh(sev->fh, &ev);
3385 }
3386 v4l2_ctrl_unlock(ctrl);
3387 return 0;
3388 }
3389
3390 static void v4l2_ctrl_del_event(struct v4l2_subscribed_event *sev)
3391 {
3392 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(sev->fh->ctrl_handler, sev->id);
3393
3394 v4l2_ctrl_lock(ctrl);
3395 list_del(&sev->node);
3396 v4l2_ctrl_unlock(ctrl);
3397 }
3398
3399 void v4l2_ctrl_replace(struct v4l2_event *old, const struct v4l2_event *new)
3400 {
3401 u32 old_changes = old->u.ctrl.changes;
3402
3403 old->u.ctrl = new->u.ctrl;
3404 old->u.ctrl.changes |= old_changes;
3405 }
3406 EXPORT_SYMBOL(v4l2_ctrl_replace);
3407
3408 void v4l2_ctrl_merge(const struct v4l2_event *old, struct v4l2_event *new)
3409 {
3410 new->u.ctrl.changes |= old->u.ctrl.changes;
3411 }
3412 EXPORT_SYMBOL(v4l2_ctrl_merge);
3413
3414 const struct v4l2_subscribed_event_ops v4l2_ctrl_sub_ev_ops = {
3415 .add = v4l2_ctrl_add_event,
3416 .del = v4l2_ctrl_del_event,
3417 .replace = v4l2_ctrl_replace,
3418 .merge = v4l2_ctrl_merge,
3419 };
3420 EXPORT_SYMBOL(v4l2_ctrl_sub_ev_ops);
3421
3422 int v4l2_ctrl_log_status(struct file *file, void *fh)
3423 {
3424 struct video_device *vfd = video_devdata(file);
3425 struct v4l2_fh *vfh = file->private_data;
3426
3427 if (test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags) && vfd->v4l2_dev)
3428 v4l2_ctrl_handler_log_status(vfh->ctrl_handler,
3429 vfd->v4l2_dev->name);
3430 return 0;
3431 }
3432 EXPORT_SYMBOL(v4l2_ctrl_log_status);
3433
3434 int v4l2_ctrl_subscribe_event(struct v4l2_fh *fh,
3435 const struct v4l2_event_subscription *sub)
3436 {
3437 if (sub->type == V4L2_EVENT_CTRL)
3438 return v4l2_event_subscribe(fh, sub, 0, &v4l2_ctrl_sub_ev_ops);
3439 return -EINVAL;
3440 }
3441 EXPORT_SYMBOL(v4l2_ctrl_subscribe_event);
3442
3443 int v4l2_ctrl_subdev_subscribe_event(struct v4l2_subdev *sd, struct v4l2_fh *fh,
3444 struct v4l2_event_subscription *sub)
3445 {
3446 if (!sd->ctrl_handler)
3447 return -EINVAL;
3448 return v4l2_ctrl_subscribe_event(fh, sub);
3449 }
3450 EXPORT_SYMBOL(v4l2_ctrl_subdev_subscribe_event);
3451
3452 unsigned int v4l2_ctrl_poll(struct file *file, struct poll_table_struct *wait)
3453 {
3454 struct v4l2_fh *fh = file->private_data;
3455
3456 if (v4l2_event_pending(fh))
3457 return POLLPRI;
3458 poll_wait(file, &fh->wait, wait);
3459 return 0;
3460 }
3461 EXPORT_SYMBOL(v4l2_ctrl_poll);
Linux kernel - Deliverables
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