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[media] m2m: fix bad unlock balance
[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 for (idx = 0; !err && idx < ctrl->elems; idx++)
1682 err = ctrl->type_ops->validate(ctrl, idx, p_new);
1683 return err;
1684 }
1685
1686 static inline u32 node2id(struct list_head *node)
1687 {
1688 return list_entry(node, struct v4l2_ctrl_ref, node)->ctrl->id;
1689 }
1690
1691 /* Set the handler's error code if it wasn't set earlier already */
1692 static inline int handler_set_err(struct v4l2_ctrl_handler *hdl, int err)
1693 {
1694 if (hdl->error == 0)
1695 hdl->error = err;
1696 return err;
1697 }
1698
1699 /* Initialize the handler */
1700 int v4l2_ctrl_handler_init_class(struct v4l2_ctrl_handler *hdl,
1701 unsigned nr_of_controls_hint,
1702 struct lock_class_key *key, const char *name)
1703 {
1704 hdl->lock = &hdl->_lock;
1705 mutex_init(hdl->lock);
1706 lockdep_set_class_and_name(hdl->lock, key, name);
1707 INIT_LIST_HEAD(&hdl->ctrls);
1708 INIT_LIST_HEAD(&hdl->ctrl_refs);
1709 hdl->nr_of_buckets = 1 + nr_of_controls_hint / 8;
1710 hdl->buckets = kcalloc(hdl->nr_of_buckets, sizeof(hdl->buckets[0]),
1711 GFP_KERNEL);
1712 hdl->error = hdl->buckets ? 0 : -ENOMEM;
1713 return hdl->error;
1714 }
1715 EXPORT_SYMBOL(v4l2_ctrl_handler_init_class);
1716
1717 /* Free all controls and control refs */
1718 void v4l2_ctrl_handler_free(struct v4l2_ctrl_handler *hdl)
1719 {
1720 struct v4l2_ctrl_ref *ref, *next_ref;
1721 struct v4l2_ctrl *ctrl, *next_ctrl;
1722 struct v4l2_subscribed_event *sev, *next_sev;
1723
1724 if (hdl == NULL || hdl->buckets == NULL)
1725 return;
1726
1727 mutex_lock(hdl->lock);
1728 /* Free all nodes */
1729 list_for_each_entry_safe(ref, next_ref, &hdl->ctrl_refs, node) {
1730 list_del(&ref->node);
1731 kfree(ref);
1732 }
1733 /* Free all controls owned by the handler */
1734 list_for_each_entry_safe(ctrl, next_ctrl, &hdl->ctrls, node) {
1735 list_del(&ctrl->node);
1736 list_for_each_entry_safe(sev, next_sev, &ctrl->ev_subs, node)
1737 list_del(&sev->node);
1738 kfree(ctrl);
1739 }
1740 kfree(hdl->buckets);
1741 hdl->buckets = NULL;
1742 hdl->cached = NULL;
1743 hdl->error = 0;
1744 mutex_unlock(hdl->lock);
1745 }
1746 EXPORT_SYMBOL(v4l2_ctrl_handler_free);
1747
1748 /* For backwards compatibility: V4L2_CID_PRIVATE_BASE should no longer
1749 be used except in G_CTRL, S_CTRL, QUERYCTRL and QUERYMENU when dealing
1750 with applications that do not use the NEXT_CTRL flag.
1751
1752 We just find the n-th private user control. It's O(N), but that should not
1753 be an issue in this particular case. */
1754 static struct v4l2_ctrl_ref *find_private_ref(
1755 struct v4l2_ctrl_handler *hdl, u32 id)
1756 {
1757 struct v4l2_ctrl_ref *ref;
1758
1759 id -= V4L2_CID_PRIVATE_BASE;
1760 list_for_each_entry(ref, &hdl->ctrl_refs, node) {
1761 /* Search for private user controls that are compatible with
1762 VIDIOC_G/S_CTRL. */
1763 if (V4L2_CTRL_ID2CLASS(ref->ctrl->id) == V4L2_CTRL_CLASS_USER &&
1764 V4L2_CTRL_DRIVER_PRIV(ref->ctrl->id)) {
1765 if (!ref->ctrl->is_int)
1766 continue;
1767 if (id == 0)
1768 return ref;
1769 id--;
1770 }
1771 }
1772 return NULL;
1773 }
1774
1775 /* Find a control with the given ID. */
1776 static struct v4l2_ctrl_ref *find_ref(struct v4l2_ctrl_handler *hdl, u32 id)
1777 {
1778 struct v4l2_ctrl_ref *ref;
1779 int bucket;
1780
1781 id &= V4L2_CTRL_ID_MASK;
1782
1783 /* Old-style private controls need special handling */
1784 if (id >= V4L2_CID_PRIVATE_BASE)
1785 return find_private_ref(hdl, id);
1786 bucket = id % hdl->nr_of_buckets;
1787
1788 /* Simple optimization: cache the last control found */
1789 if (hdl->cached && hdl->cached->ctrl->id == id)
1790 return hdl->cached;
1791
1792 /* Not in cache, search the hash */
1793 ref = hdl->buckets ? hdl->buckets[bucket] : NULL;
1794 while (ref && ref->ctrl->id != id)
1795 ref = ref->next;
1796
1797 if (ref)
1798 hdl->cached = ref; /* cache it! */
1799 return ref;
1800 }
1801
1802 /* Find a control with the given ID. Take the handler's lock first. */
1803 static struct v4l2_ctrl_ref *find_ref_lock(
1804 struct v4l2_ctrl_handler *hdl, u32 id)
1805 {
1806 struct v4l2_ctrl_ref *ref = NULL;
1807
1808 if (hdl) {
1809 mutex_lock(hdl->lock);
1810 ref = find_ref(hdl, id);
1811 mutex_unlock(hdl->lock);
1812 }
1813 return ref;
1814 }
1815
1816 /* Find a control with the given ID. */
1817 struct v4l2_ctrl *v4l2_ctrl_find(struct v4l2_ctrl_handler *hdl, u32 id)
1818 {
1819 struct v4l2_ctrl_ref *ref = find_ref_lock(hdl, id);
1820
1821 return ref ? ref->ctrl : NULL;
1822 }
1823 EXPORT_SYMBOL(v4l2_ctrl_find);
1824
1825 /* Allocate a new v4l2_ctrl_ref and hook it into the handler. */
1826 static int handler_new_ref(struct v4l2_ctrl_handler *hdl,
1827 struct v4l2_ctrl *ctrl)
1828 {
1829 struct v4l2_ctrl_ref *ref;
1830 struct v4l2_ctrl_ref *new_ref;
1831 u32 id = ctrl->id;
1832 u32 class_ctrl = V4L2_CTRL_ID2CLASS(id) | 1;
1833 int bucket = id % hdl->nr_of_buckets; /* which bucket to use */
1834
1835 /*
1836 * Automatically add the control class if it is not yet present and
1837 * the new control is not a compound control.
1838 */
1839 if (ctrl->type < V4L2_CTRL_COMPOUND_TYPES &&
1840 id != class_ctrl && find_ref_lock(hdl, class_ctrl) == NULL)
1841 if (!v4l2_ctrl_new_std(hdl, NULL, class_ctrl, 0, 0, 0, 0))
1842 return hdl->error;
1843
1844 if (hdl->error)
1845 return hdl->error;
1846
1847 new_ref = kzalloc(sizeof(*new_ref), GFP_KERNEL);
1848 if (!new_ref)
1849 return handler_set_err(hdl, -ENOMEM);
1850 new_ref->ctrl = ctrl;
1851 if (ctrl->handler == hdl) {
1852 /* By default each control starts in a cluster of its own.
1853 new_ref->ctrl is basically a cluster array with one
1854 element, so that's perfect to use as the cluster pointer.
1855 But only do this for the handler that owns the control. */
1856 ctrl->cluster = &new_ref->ctrl;
1857 ctrl->ncontrols = 1;
1858 }
1859
1860 INIT_LIST_HEAD(&new_ref->node);
1861
1862 mutex_lock(hdl->lock);
1863
1864 /* Add immediately at the end of the list if the list is empty, or if
1865 the last element in the list has a lower ID.
1866 This ensures that when elements are added in ascending order the
1867 insertion is an O(1) operation. */
1868 if (list_empty(&hdl->ctrl_refs) || id > node2id(hdl->ctrl_refs.prev)) {
1869 list_add_tail(&new_ref->node, &hdl->ctrl_refs);
1870 goto insert_in_hash;
1871 }
1872
1873 /* Find insert position in sorted list */
1874 list_for_each_entry(ref, &hdl->ctrl_refs, node) {
1875 if (ref->ctrl->id < id)
1876 continue;
1877 /* Don't add duplicates */
1878 if (ref->ctrl->id == id) {
1879 kfree(new_ref);
1880 goto unlock;
1881 }
1882 list_add(&new_ref->node, ref->node.prev);
1883 break;
1884 }
1885
1886 insert_in_hash:
1887 /* Insert the control node in the hash */
1888 new_ref->next = hdl->buckets[bucket];
1889 hdl->buckets[bucket] = new_ref;
1890
1891 unlock:
1892 mutex_unlock(hdl->lock);
1893 return 0;
1894 }
1895
1896 /* Add a new control */
1897 static struct v4l2_ctrl *v4l2_ctrl_new(struct v4l2_ctrl_handler *hdl,
1898 const struct v4l2_ctrl_ops *ops,
1899 const struct v4l2_ctrl_type_ops *type_ops,
1900 u32 id, const char *name, enum v4l2_ctrl_type type,
1901 s64 min, s64 max, u64 step, s64 def,
1902 const u32 dims[V4L2_CTRL_MAX_DIMS], u32 elem_size,
1903 u32 flags, const char * const *qmenu,
1904 const s64 *qmenu_int, void *priv)
1905 {
1906 struct v4l2_ctrl *ctrl;
1907 unsigned sz_extra;
1908 unsigned nr_of_dims = 0;
1909 unsigned elems = 1;
1910 bool is_array;
1911 unsigned tot_ctrl_size;
1912 unsigned idx;
1913 void *data;
1914 int err;
1915
1916 if (hdl->error)
1917 return NULL;
1918
1919 while (dims && dims[nr_of_dims]) {
1920 elems *= dims[nr_of_dims];
1921 nr_of_dims++;
1922 if (nr_of_dims == V4L2_CTRL_MAX_DIMS)
1923 break;
1924 }
1925 is_array = nr_of_dims > 0;
1926
1927 /* Prefill elem_size for all types handled by std_type_ops */
1928 switch (type) {
1929 case V4L2_CTRL_TYPE_INTEGER64:
1930 elem_size = sizeof(s64);
1931 break;
1932 case V4L2_CTRL_TYPE_STRING:
1933 elem_size = max + 1;
1934 break;
1935 case V4L2_CTRL_TYPE_U8:
1936 elem_size = sizeof(u8);
1937 break;
1938 case V4L2_CTRL_TYPE_U16:
1939 elem_size = sizeof(u16);
1940 break;
1941 case V4L2_CTRL_TYPE_U32:
1942 elem_size = sizeof(u32);
1943 break;
1944 default:
1945 if (type < V4L2_CTRL_COMPOUND_TYPES)
1946 elem_size = sizeof(s32);
1947 break;
1948 }
1949 tot_ctrl_size = elem_size * elems;
1950
1951 /* Sanity checks */
1952 if (id == 0 || name == NULL || !elem_size ||
1953 id >= V4L2_CID_PRIVATE_BASE ||
1954 (type == V4L2_CTRL_TYPE_MENU && qmenu == NULL) ||
1955 (type == V4L2_CTRL_TYPE_INTEGER_MENU && qmenu_int == NULL)) {
1956 handler_set_err(hdl, -ERANGE);
1957 return NULL;
1958 }
1959 err = check_range(type, min, max, step, def);
1960 if (err) {
1961 handler_set_err(hdl, err);
1962 return NULL;
1963 }
1964 if (type == V4L2_CTRL_TYPE_BITMASK && ((def & ~max) || min || step)) {
1965 handler_set_err(hdl, -ERANGE);
1966 return NULL;
1967 }
1968 if (is_array &&
1969 (type == V4L2_CTRL_TYPE_BUTTON ||
1970 type == V4L2_CTRL_TYPE_CTRL_CLASS)) {
1971 handler_set_err(hdl, -EINVAL);
1972 return NULL;
1973 }
1974
1975 sz_extra = 0;
1976 if (type == V4L2_CTRL_TYPE_BUTTON)
1977 flags |= V4L2_CTRL_FLAG_WRITE_ONLY |
1978 V4L2_CTRL_FLAG_EXECUTE_ON_WRITE;
1979 else if (type == V4L2_CTRL_TYPE_CTRL_CLASS)
1980 flags |= V4L2_CTRL_FLAG_READ_ONLY;
1981 else if (type == V4L2_CTRL_TYPE_INTEGER64 ||
1982 type == V4L2_CTRL_TYPE_STRING ||
1983 type >= V4L2_CTRL_COMPOUND_TYPES ||
1984 is_array)
1985 sz_extra += 2 * tot_ctrl_size;
1986
1987 ctrl = kzalloc(sizeof(*ctrl) + sz_extra, GFP_KERNEL);
1988 if (ctrl == NULL) {
1989 handler_set_err(hdl, -ENOMEM);
1990 return NULL;
1991 }
1992
1993 INIT_LIST_HEAD(&ctrl->node);
1994 INIT_LIST_HEAD(&ctrl->ev_subs);
1995 ctrl->handler = hdl;
1996 ctrl->ops = ops;
1997 ctrl->type_ops = type_ops ? type_ops : &std_type_ops;
1998 ctrl->id = id;
1999 ctrl->name = name;
2000 ctrl->type = type;
2001 ctrl->flags = flags;
2002 ctrl->minimum = min;
2003 ctrl->maximum = max;
2004 ctrl->step = step;
2005 ctrl->default_value = def;
2006 ctrl->is_string = !is_array && type == V4L2_CTRL_TYPE_STRING;
2007 ctrl->is_ptr = is_array || type >= V4L2_CTRL_COMPOUND_TYPES || ctrl->is_string;
2008 ctrl->is_int = !ctrl->is_ptr && type != V4L2_CTRL_TYPE_INTEGER64;
2009 ctrl->is_array = is_array;
2010 ctrl->elems = elems;
2011 ctrl->nr_of_dims = nr_of_dims;
2012 if (nr_of_dims)
2013 memcpy(ctrl->dims, dims, nr_of_dims * sizeof(dims[0]));
2014 ctrl->elem_size = elem_size;
2015 if (type == V4L2_CTRL_TYPE_MENU)
2016 ctrl->qmenu = qmenu;
2017 else if (type == V4L2_CTRL_TYPE_INTEGER_MENU)
2018 ctrl->qmenu_int = qmenu_int;
2019 ctrl->priv = priv;
2020 ctrl->cur.val = ctrl->val = def;
2021 data = &ctrl[1];
2022
2023 if (!ctrl->is_int) {
2024 ctrl->p_new.p = data;
2025 ctrl->p_cur.p = data + tot_ctrl_size;
2026 } else {
2027 ctrl->p_new.p = &ctrl->val;
2028 ctrl->p_cur.p = &ctrl->cur.val;
2029 }
2030 for (idx = 0; idx < elems; idx++) {
2031 ctrl->type_ops->init(ctrl, idx, ctrl->p_cur);
2032 ctrl->type_ops->init(ctrl, idx, ctrl->p_new);
2033 }
2034
2035 if (handler_new_ref(hdl, ctrl)) {
2036 kfree(ctrl);
2037 return NULL;
2038 }
2039 mutex_lock(hdl->lock);
2040 list_add_tail(&ctrl->node, &hdl->ctrls);
2041 mutex_unlock(hdl->lock);
2042 return ctrl;
2043 }
2044
2045 struct v4l2_ctrl *v4l2_ctrl_new_custom(struct v4l2_ctrl_handler *hdl,
2046 const struct v4l2_ctrl_config *cfg, void *priv)
2047 {
2048 bool is_menu;
2049 struct v4l2_ctrl *ctrl;
2050 const char *name = cfg->name;
2051 const char * const *qmenu = cfg->qmenu;
2052 const s64 *qmenu_int = cfg->qmenu_int;
2053 enum v4l2_ctrl_type type = cfg->type;
2054 u32 flags = cfg->flags;
2055 s64 min = cfg->min;
2056 s64 max = cfg->max;
2057 u64 step = cfg->step;
2058 s64 def = cfg->def;
2059
2060 if (name == NULL)
2061 v4l2_ctrl_fill(cfg->id, &name, &type, &min, &max, &step,
2062 &def, &flags);
2063
2064 is_menu = (cfg->type == V4L2_CTRL_TYPE_MENU ||
2065 cfg->type == V4L2_CTRL_TYPE_INTEGER_MENU);
2066 if (is_menu)
2067 WARN_ON(step);
2068 else
2069 WARN_ON(cfg->menu_skip_mask);
2070 if (cfg->type == V4L2_CTRL_TYPE_MENU && qmenu == NULL)
2071 qmenu = v4l2_ctrl_get_menu(cfg->id);
2072 else if (cfg->type == V4L2_CTRL_TYPE_INTEGER_MENU &&
2073 qmenu_int == NULL) {
2074 handler_set_err(hdl, -EINVAL);
2075 return NULL;
2076 }
2077
2078 ctrl = v4l2_ctrl_new(hdl, cfg->ops, cfg->type_ops, cfg->id, name,
2079 type, min, max,
2080 is_menu ? cfg->menu_skip_mask : step, def,
2081 cfg->dims, cfg->elem_size,
2082 flags, qmenu, qmenu_int, priv);
2083 if (ctrl)
2084 ctrl->is_private = cfg->is_private;
2085 return ctrl;
2086 }
2087 EXPORT_SYMBOL(v4l2_ctrl_new_custom);
2088
2089 /* Helper function for standard non-menu controls */
2090 struct v4l2_ctrl *v4l2_ctrl_new_std(struct v4l2_ctrl_handler *hdl,
2091 const struct v4l2_ctrl_ops *ops,
2092 u32 id, s64 min, s64 max, u64 step, s64 def)
2093 {
2094 const char *name;
2095 enum v4l2_ctrl_type type;
2096 u32 flags;
2097
2098 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
2099 if (type == V4L2_CTRL_TYPE_MENU ||
2100 type == V4L2_CTRL_TYPE_INTEGER_MENU ||
2101 type >= V4L2_CTRL_COMPOUND_TYPES) {
2102 handler_set_err(hdl, -EINVAL);
2103 return NULL;
2104 }
2105 return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
2106 min, max, step, def, NULL, 0,
2107 flags, NULL, NULL, NULL);
2108 }
2109 EXPORT_SYMBOL(v4l2_ctrl_new_std);
2110
2111 /* Helper function for standard menu controls */
2112 struct v4l2_ctrl *v4l2_ctrl_new_std_menu(struct v4l2_ctrl_handler *hdl,
2113 const struct v4l2_ctrl_ops *ops,
2114 u32 id, u8 _max, u64 mask, u8 _def)
2115 {
2116 const char * const *qmenu = NULL;
2117 const s64 *qmenu_int = NULL;
2118 unsigned int qmenu_int_len = 0;
2119 const char *name;
2120 enum v4l2_ctrl_type type;
2121 s64 min;
2122 s64 max = _max;
2123 s64 def = _def;
2124 u64 step;
2125 u32 flags;
2126
2127 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
2128
2129 if (type == V4L2_CTRL_TYPE_MENU)
2130 qmenu = v4l2_ctrl_get_menu(id);
2131 else if (type == V4L2_CTRL_TYPE_INTEGER_MENU)
2132 qmenu_int = v4l2_ctrl_get_int_menu(id, &qmenu_int_len);
2133
2134 if ((!qmenu && !qmenu_int) || (qmenu_int && max > qmenu_int_len)) {
2135 handler_set_err(hdl, -EINVAL);
2136 return NULL;
2137 }
2138 return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
2139 0, max, mask, def, NULL, 0,
2140 flags, qmenu, qmenu_int, NULL);
2141 }
2142 EXPORT_SYMBOL(v4l2_ctrl_new_std_menu);
2143
2144 /* Helper function for standard menu controls with driver defined menu */
2145 struct v4l2_ctrl *v4l2_ctrl_new_std_menu_items(struct v4l2_ctrl_handler *hdl,
2146 const struct v4l2_ctrl_ops *ops, u32 id, u8 _max,
2147 u64 mask, u8 _def, const char * const *qmenu)
2148 {
2149 enum v4l2_ctrl_type type;
2150 const char *name;
2151 u32 flags;
2152 u64 step;
2153 s64 min;
2154 s64 max = _max;
2155 s64 def = _def;
2156
2157 /* v4l2_ctrl_new_std_menu_items() should only be called for
2158 * standard controls without a standard menu.
2159 */
2160 if (v4l2_ctrl_get_menu(id)) {
2161 handler_set_err(hdl, -EINVAL);
2162 return NULL;
2163 }
2164
2165 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
2166 if (type != V4L2_CTRL_TYPE_MENU || qmenu == NULL) {
2167 handler_set_err(hdl, -EINVAL);
2168 return NULL;
2169 }
2170 return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
2171 0, max, mask, def, NULL, 0,
2172 flags, qmenu, NULL, NULL);
2173
2174 }
2175 EXPORT_SYMBOL(v4l2_ctrl_new_std_menu_items);
2176
2177 /* Helper function for standard integer menu controls */
2178 struct v4l2_ctrl *v4l2_ctrl_new_int_menu(struct v4l2_ctrl_handler *hdl,
2179 const struct v4l2_ctrl_ops *ops,
2180 u32 id, u8 _max, u8 _def, const s64 *qmenu_int)
2181 {
2182 const char *name;
2183 enum v4l2_ctrl_type type;
2184 s64 min;
2185 u64 step;
2186 s64 max = _max;
2187 s64 def = _def;
2188 u32 flags;
2189
2190 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
2191 if (type != V4L2_CTRL_TYPE_INTEGER_MENU) {
2192 handler_set_err(hdl, -EINVAL);
2193 return NULL;
2194 }
2195 return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
2196 0, max, 0, def, NULL, 0,
2197 flags, NULL, qmenu_int, NULL);
2198 }
2199 EXPORT_SYMBOL(v4l2_ctrl_new_int_menu);
2200
2201 /* Add a control from another handler to this handler */
2202 struct v4l2_ctrl *v4l2_ctrl_add_ctrl(struct v4l2_ctrl_handler *hdl,
2203 struct v4l2_ctrl *ctrl)
2204 {
2205 if (hdl == NULL || hdl->error)
2206 return NULL;
2207 if (ctrl == NULL) {
2208 handler_set_err(hdl, -EINVAL);
2209 return NULL;
2210 }
2211 if (ctrl->handler == hdl)
2212 return ctrl;
2213 return handler_new_ref(hdl, ctrl) ? NULL : ctrl;
2214 }
2215 EXPORT_SYMBOL(v4l2_ctrl_add_ctrl);
2216
2217 /* Add the controls from another handler to our own. */
2218 int v4l2_ctrl_add_handler(struct v4l2_ctrl_handler *hdl,
2219 struct v4l2_ctrl_handler *add,
2220 bool (*filter)(const struct v4l2_ctrl *ctrl))
2221 {
2222 struct v4l2_ctrl_ref *ref;
2223 int ret = 0;
2224
2225 /* Do nothing if either handler is NULL or if they are the same */
2226 if (!hdl || !add || hdl == add)
2227 return 0;
2228 if (hdl->error)
2229 return hdl->error;
2230 mutex_lock(add->lock);
2231 list_for_each_entry(ref, &add->ctrl_refs, node) {
2232 struct v4l2_ctrl *ctrl = ref->ctrl;
2233
2234 /* Skip handler-private controls. */
2235 if (ctrl->is_private)
2236 continue;
2237 /* And control classes */
2238 if (ctrl->type == V4L2_CTRL_TYPE_CTRL_CLASS)
2239 continue;
2240 /* Filter any unwanted controls */
2241 if (filter && !filter(ctrl))
2242 continue;
2243 ret = handler_new_ref(hdl, ctrl);
2244 if (ret)
2245 break;
2246 }
2247 mutex_unlock(add->lock);
2248 return ret;
2249 }
2250 EXPORT_SYMBOL(v4l2_ctrl_add_handler);
2251
2252 bool v4l2_ctrl_radio_filter(const struct v4l2_ctrl *ctrl)
2253 {
2254 if (V4L2_CTRL_ID2CLASS(ctrl->id) == V4L2_CTRL_CLASS_FM_TX)
2255 return true;
2256 if (V4L2_CTRL_ID2CLASS(ctrl->id) == V4L2_CTRL_CLASS_FM_RX)
2257 return true;
2258 switch (ctrl->id) {
2259 case V4L2_CID_AUDIO_MUTE:
2260 case V4L2_CID_AUDIO_VOLUME:
2261 case V4L2_CID_AUDIO_BALANCE:
2262 case V4L2_CID_AUDIO_BASS:
2263 case V4L2_CID_AUDIO_TREBLE:
2264 case V4L2_CID_AUDIO_LOUDNESS:
2265 return true;
2266 default:
2267 break;
2268 }
2269 return false;
2270 }
2271 EXPORT_SYMBOL(v4l2_ctrl_radio_filter);
2272
2273 /* Cluster controls */
2274 void v4l2_ctrl_cluster(unsigned ncontrols, struct v4l2_ctrl **controls)
2275 {
2276 bool has_volatiles = false;
2277 int i;
2278
2279 /* The first control is the master control and it must not be NULL */
2280 if (WARN_ON(ncontrols == 0 || controls[0] == NULL))
2281 return;
2282
2283 for (i = 0; i < ncontrols; i++) {
2284 if (controls[i]) {
2285 controls[i]->cluster = controls;
2286 controls[i]->ncontrols = ncontrols;
2287 if (controls[i]->flags & V4L2_CTRL_FLAG_VOLATILE)
2288 has_volatiles = true;
2289 }
2290 }
2291 controls[0]->has_volatiles = has_volatiles;
2292 }
2293 EXPORT_SYMBOL(v4l2_ctrl_cluster);
2294
2295 void v4l2_ctrl_auto_cluster(unsigned ncontrols, struct v4l2_ctrl **controls,
2296 u8 manual_val, bool set_volatile)
2297 {
2298 struct v4l2_ctrl *master = controls[0];
2299 u32 flag = 0;
2300 int i;
2301
2302 v4l2_ctrl_cluster(ncontrols, controls);
2303 WARN_ON(ncontrols <= 1);
2304 WARN_ON(manual_val < master->minimum || manual_val > master->maximum);
2305 WARN_ON(set_volatile && !has_op(master, g_volatile_ctrl));
2306 master->is_auto = true;
2307 master->has_volatiles = set_volatile;
2308 master->manual_mode_value = manual_val;
2309 master->flags |= V4L2_CTRL_FLAG_UPDATE;
2310
2311 if (!is_cur_manual(master))
2312 flag = V4L2_CTRL_FLAG_INACTIVE |
2313 (set_volatile ? V4L2_CTRL_FLAG_VOLATILE : 0);
2314
2315 for (i = 1; i < ncontrols; i++)
2316 if (controls[i])
2317 controls[i]->flags |= flag;
2318 }
2319 EXPORT_SYMBOL(v4l2_ctrl_auto_cluster);
2320
2321 /* Activate/deactivate a control. */
2322 void v4l2_ctrl_activate(struct v4l2_ctrl *ctrl, bool active)
2323 {
2324 /* invert since the actual flag is called 'inactive' */
2325 bool inactive = !active;
2326 bool old;
2327
2328 if (ctrl == NULL)
2329 return;
2330
2331 if (inactive)
2332 /* set V4L2_CTRL_FLAG_INACTIVE */
2333 old = test_and_set_bit(4, &ctrl->flags);
2334 else
2335 /* clear V4L2_CTRL_FLAG_INACTIVE */
2336 old = test_and_clear_bit(4, &ctrl->flags);
2337 if (old != inactive)
2338 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_FLAGS);
2339 }
2340 EXPORT_SYMBOL(v4l2_ctrl_activate);
2341
2342 /* Grab/ungrab a control.
2343 Typically used when streaming starts and you want to grab controls,
2344 preventing the user from changing them.
2345
2346 Just call this and the framework will block any attempts to change
2347 these controls. */
2348 void v4l2_ctrl_grab(struct v4l2_ctrl *ctrl, bool grabbed)
2349 {
2350 bool old;
2351
2352 if (ctrl == NULL)
2353 return;
2354
2355 v4l2_ctrl_lock(ctrl);
2356 if (grabbed)
2357 /* set V4L2_CTRL_FLAG_GRABBED */
2358 old = test_and_set_bit(1, &ctrl->flags);
2359 else
2360 /* clear V4L2_CTRL_FLAG_GRABBED */
2361 old = test_and_clear_bit(1, &ctrl->flags);
2362 if (old != grabbed)
2363 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_FLAGS);
2364 v4l2_ctrl_unlock(ctrl);
2365 }
2366 EXPORT_SYMBOL(v4l2_ctrl_grab);
2367
2368 /* Log the control name and value */
2369 static void log_ctrl(const struct v4l2_ctrl *ctrl,
2370 const char *prefix, const char *colon)
2371 {
2372 if (ctrl->flags & (V4L2_CTRL_FLAG_DISABLED | V4L2_CTRL_FLAG_WRITE_ONLY))
2373 return;
2374 if (ctrl->type == V4L2_CTRL_TYPE_CTRL_CLASS)
2375 return;
2376
2377 pr_info("%s%s%s: ", prefix, colon, ctrl->name);
2378
2379 ctrl->type_ops->log(ctrl);
2380
2381 if (ctrl->flags & (V4L2_CTRL_FLAG_INACTIVE |
2382 V4L2_CTRL_FLAG_GRABBED |
2383 V4L2_CTRL_FLAG_VOLATILE)) {
2384 if (ctrl->flags & V4L2_CTRL_FLAG_INACTIVE)
2385 pr_cont(" inactive");
2386 if (ctrl->flags & V4L2_CTRL_FLAG_GRABBED)
2387 pr_cont(" grabbed");
2388 if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE)
2389 pr_cont(" volatile");
2390 }
2391 pr_cont("\n");
2392 }
2393
2394 /* Log all controls owned by the handler */
2395 void v4l2_ctrl_handler_log_status(struct v4l2_ctrl_handler *hdl,
2396 const char *prefix)
2397 {
2398 struct v4l2_ctrl *ctrl;
2399 const char *colon = "";
2400 int len;
2401
2402 if (hdl == NULL)
2403 return;
2404 if (prefix == NULL)
2405 prefix = "";
2406 len = strlen(prefix);
2407 if (len && prefix[len - 1] != ' ')
2408 colon = ": ";
2409 mutex_lock(hdl->lock);
2410 list_for_each_entry(ctrl, &hdl->ctrls, node)
2411 if (!(ctrl->flags & V4L2_CTRL_FLAG_DISABLED))
2412 log_ctrl(ctrl, prefix, colon);
2413 mutex_unlock(hdl->lock);
2414 }
2415 EXPORT_SYMBOL(v4l2_ctrl_handler_log_status);
2416
2417 int v4l2_ctrl_subdev_log_status(struct v4l2_subdev *sd)
2418 {
2419 v4l2_ctrl_handler_log_status(sd->ctrl_handler, sd->name);
2420 return 0;
2421 }
2422 EXPORT_SYMBOL(v4l2_ctrl_subdev_log_status);
2423
2424 /* Call s_ctrl for all controls owned by the handler */
2425 int v4l2_ctrl_handler_setup(struct v4l2_ctrl_handler *hdl)
2426 {
2427 struct v4l2_ctrl *ctrl;
2428 int ret = 0;
2429
2430 if (hdl == NULL)
2431 return 0;
2432 mutex_lock(hdl->lock);
2433 list_for_each_entry(ctrl, &hdl->ctrls, node)
2434 ctrl->done = false;
2435
2436 list_for_each_entry(ctrl, &hdl->ctrls, node) {
2437 struct v4l2_ctrl *master = ctrl->cluster[0];
2438 int i;
2439
2440 /* Skip if this control was already handled by a cluster. */
2441 /* Skip button controls and read-only controls. */
2442 if (ctrl->done || ctrl->type == V4L2_CTRL_TYPE_BUTTON ||
2443 (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY))
2444 continue;
2445
2446 for (i = 0; i < master->ncontrols; i++) {
2447 if (master->cluster[i]) {
2448 cur_to_new(master->cluster[i]);
2449 master->cluster[i]->is_new = 1;
2450 master->cluster[i]->done = true;
2451 }
2452 }
2453 ret = call_op(master, s_ctrl);
2454 if (ret)
2455 break;
2456 }
2457 mutex_unlock(hdl->lock);
2458 return ret;
2459 }
2460 EXPORT_SYMBOL(v4l2_ctrl_handler_setup);
2461
2462 /* Implement VIDIOC_QUERY_EXT_CTRL */
2463 int v4l2_query_ext_ctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_query_ext_ctrl *qc)
2464 {
2465 const unsigned next_flags = V4L2_CTRL_FLAG_NEXT_CTRL | V4L2_CTRL_FLAG_NEXT_COMPOUND;
2466 u32 id = qc->id & V4L2_CTRL_ID_MASK;
2467 struct v4l2_ctrl_ref *ref;
2468 struct v4l2_ctrl *ctrl;
2469
2470 if (hdl == NULL)
2471 return -EINVAL;
2472
2473 mutex_lock(hdl->lock);
2474
2475 /* Try to find it */
2476 ref = find_ref(hdl, id);
2477
2478 if ((qc->id & next_flags) && !list_empty(&hdl->ctrl_refs)) {
2479 bool is_compound;
2480 /* Match any control that is not hidden */
2481 unsigned mask = 1;
2482 bool match = false;
2483
2484 if ((qc->id & next_flags) == V4L2_CTRL_FLAG_NEXT_COMPOUND) {
2485 /* Match any hidden control */
2486 match = true;
2487 } else if ((qc->id & next_flags) == next_flags) {
2488 /* Match any control, compound or not */
2489 mask = 0;
2490 }
2491
2492 /* Find the next control with ID > qc->id */
2493
2494 /* Did we reach the end of the control list? */
2495 if (id >= node2id(hdl->ctrl_refs.prev)) {
2496 ref = NULL; /* Yes, so there is no next control */
2497 } else if (ref) {
2498 /* We found a control with the given ID, so just get
2499 the next valid one in the list. */
2500 list_for_each_entry_continue(ref, &hdl->ctrl_refs, node) {
2501 is_compound =
2502 ref->ctrl->type >= V4L2_CTRL_COMPOUND_TYPES;
2503 if (id < ref->ctrl->id &&
2504 (is_compound & mask) == match)
2505 break;
2506 }
2507 if (&ref->node == &hdl->ctrl_refs)
2508 ref = NULL;
2509 } else {
2510 /* No control with the given ID exists, so start
2511 searching for the next largest ID. We know there
2512 is one, otherwise the first 'if' above would have
2513 been true. */
2514 list_for_each_entry(ref, &hdl->ctrl_refs, node) {
2515 is_compound =
2516 ref->ctrl->type >= V4L2_CTRL_COMPOUND_TYPES;
2517 if (id < ref->ctrl->id &&
2518 (is_compound & mask) == match)
2519 break;
2520 }
2521 if (&ref->node == &hdl->ctrl_refs)
2522 ref = NULL;
2523 }
2524 }
2525 mutex_unlock(hdl->lock);
2526
2527 if (!ref)
2528 return -EINVAL;
2529
2530 ctrl = ref->ctrl;
2531 memset(qc, 0, sizeof(*qc));
2532 if (id >= V4L2_CID_PRIVATE_BASE)
2533 qc->id = id;
2534 else
2535 qc->id = ctrl->id;
2536 strlcpy(qc->name, ctrl->name, sizeof(qc->name));
2537 qc->flags = ctrl->flags;
2538 qc->type = ctrl->type;
2539 if (ctrl->is_ptr)
2540 qc->flags |= V4L2_CTRL_FLAG_HAS_PAYLOAD;
2541 qc->elem_size = ctrl->elem_size;
2542 qc->elems = ctrl->elems;
2543 qc->nr_of_dims = ctrl->nr_of_dims;
2544 memcpy(qc->dims, ctrl->dims, qc->nr_of_dims * sizeof(qc->dims[0]));
2545 qc->minimum = ctrl->minimum;
2546 qc->maximum = ctrl->maximum;
2547 qc->default_value = ctrl->default_value;
2548 if (ctrl->type == V4L2_CTRL_TYPE_MENU
2549 || ctrl->type == V4L2_CTRL_TYPE_INTEGER_MENU)
2550 qc->step = 1;
2551 else
2552 qc->step = ctrl->step;
2553 return 0;
2554 }
2555 EXPORT_SYMBOL(v4l2_query_ext_ctrl);
2556
2557 /* Implement VIDIOC_QUERYCTRL */
2558 int v4l2_queryctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_queryctrl *qc)
2559 {
2560 struct v4l2_query_ext_ctrl qec = { qc->id };
2561 int rc;
2562
2563 rc = v4l2_query_ext_ctrl(hdl, &qec);
2564 if (rc)
2565 return rc;
2566
2567 qc->id = qec.id;
2568 qc->type = qec.type;
2569 qc->flags = qec.flags;
2570 strlcpy(qc->name, qec.name, sizeof(qc->name));
2571 switch (qc->type) {
2572 case V4L2_CTRL_TYPE_INTEGER:
2573 case V4L2_CTRL_TYPE_BOOLEAN:
2574 case V4L2_CTRL_TYPE_MENU:
2575 case V4L2_CTRL_TYPE_INTEGER_MENU:
2576 case V4L2_CTRL_TYPE_STRING:
2577 case V4L2_CTRL_TYPE_BITMASK:
2578 qc->minimum = qec.minimum;
2579 qc->maximum = qec.maximum;
2580 qc->step = qec.step;
2581 qc->default_value = qec.default_value;
2582 break;
2583 default:
2584 qc->minimum = 0;
2585 qc->maximum = 0;
2586 qc->step = 0;
2587 qc->default_value = 0;
2588 break;
2589 }
2590 return 0;
2591 }
2592 EXPORT_SYMBOL(v4l2_queryctrl);
2593
2594 int v4l2_subdev_queryctrl(struct v4l2_subdev *sd, struct v4l2_queryctrl *qc)
2595 {
2596 if (qc->id & (V4L2_CTRL_FLAG_NEXT_CTRL | V4L2_CTRL_FLAG_NEXT_COMPOUND))
2597 return -EINVAL;
2598 return v4l2_queryctrl(sd->ctrl_handler, qc);
2599 }
2600 EXPORT_SYMBOL(v4l2_subdev_queryctrl);
2601
2602 /* Implement VIDIOC_QUERYMENU */
2603 int v4l2_querymenu(struct v4l2_ctrl_handler *hdl, struct v4l2_querymenu *qm)
2604 {
2605 struct v4l2_ctrl *ctrl;
2606 u32 i = qm->index;
2607
2608 ctrl = v4l2_ctrl_find(hdl, qm->id);
2609 if (!ctrl)
2610 return -EINVAL;
2611
2612 qm->reserved = 0;
2613 /* Sanity checks */
2614 switch (ctrl->type) {
2615 case V4L2_CTRL_TYPE_MENU:
2616 if (ctrl->qmenu == NULL)
2617 return -EINVAL;
2618 break;
2619 case V4L2_CTRL_TYPE_INTEGER_MENU:
2620 if (ctrl->qmenu_int == NULL)
2621 return -EINVAL;
2622 break;
2623 default:
2624 return -EINVAL;
2625 }
2626
2627 if (i < ctrl->minimum || i > ctrl->maximum)
2628 return -EINVAL;
2629
2630 /* Use mask to see if this menu item should be skipped */
2631 if (ctrl->menu_skip_mask & (1 << i))
2632 return -EINVAL;
2633 /* Empty menu items should also be skipped */
2634 if (ctrl->type == V4L2_CTRL_TYPE_MENU) {
2635 if (ctrl->qmenu[i] == NULL || ctrl->qmenu[i][0] == '\0')
2636 return -EINVAL;
2637 strlcpy(qm->name, ctrl->qmenu[i], sizeof(qm->name));
2638 } else {
2639 qm->value = ctrl->qmenu_int[i];
2640 }
2641 return 0;
2642 }
2643 EXPORT_SYMBOL(v4l2_querymenu);
2644
2645 int v4l2_subdev_querymenu(struct v4l2_subdev *sd, struct v4l2_querymenu *qm)
2646 {
2647 return v4l2_querymenu(sd->ctrl_handler, qm);
2648 }
2649 EXPORT_SYMBOL(v4l2_subdev_querymenu);
2650
2651
2652
2653 /* Some general notes on the atomic requirements of VIDIOC_G/TRY/S_EXT_CTRLS:
2654
2655 It is not a fully atomic operation, just best-effort only. After all, if
2656 multiple controls have to be set through multiple i2c writes (for example)
2657 then some initial writes may succeed while others fail. Thus leaving the
2658 system in an inconsistent state. The question is how much effort you are
2659 willing to spend on trying to make something atomic that really isn't.
2660
2661 From the point of view of an application the main requirement is that
2662 when you call VIDIOC_S_EXT_CTRLS and some values are invalid then an
2663 error should be returned without actually affecting any controls.
2664
2665 If all the values are correct, then it is acceptable to just give up
2666 in case of low-level errors.
2667
2668 It is important though that the application can tell when only a partial
2669 configuration was done. The way we do that is through the error_idx field
2670 of struct v4l2_ext_controls: if that is equal to the count field then no
2671 controls were affected. Otherwise all controls before that index were
2672 successful in performing their 'get' or 'set' operation, the control at
2673 the given index failed, and you don't know what happened with the controls
2674 after the failed one. Since if they were part of a control cluster they
2675 could have been successfully processed (if a cluster member was encountered
2676 at index < error_idx), they could have failed (if a cluster member was at
2677 error_idx), or they may not have been processed yet (if the first cluster
2678 member appeared after error_idx).
2679
2680 It is all fairly theoretical, though. In practice all you can do is to
2681 bail out. If error_idx == count, then it is an application bug. If
2682 error_idx < count then it is only an application bug if the error code was
2683 EBUSY. That usually means that something started streaming just when you
2684 tried to set the controls. In all other cases it is a driver/hardware
2685 problem and all you can do is to retry or bail out.
2686
2687 Note that these rules do not apply to VIDIOC_TRY_EXT_CTRLS: since that
2688 never modifies controls the error_idx is just set to whatever control
2689 has an invalid value.
2690 */
2691
2692 /* Prepare for the extended g/s/try functions.
2693 Find the controls in the control array and do some basic checks. */
2694 static int prepare_ext_ctrls(struct v4l2_ctrl_handler *hdl,
2695 struct v4l2_ext_controls *cs,
2696 struct v4l2_ctrl_helper *helpers,
2697 bool get)
2698 {
2699 struct v4l2_ctrl_helper *h;
2700 bool have_clusters = false;
2701 u32 i;
2702
2703 for (i = 0, h = helpers; i < cs->count; i++, h++) {
2704 struct v4l2_ext_control *c = &cs->controls[i];
2705 struct v4l2_ctrl_ref *ref;
2706 struct v4l2_ctrl *ctrl;
2707 u32 id = c->id & V4L2_CTRL_ID_MASK;
2708
2709 cs->error_idx = i;
2710
2711 if (cs->ctrl_class && V4L2_CTRL_ID2CLASS(id) != cs->ctrl_class)
2712 return -EINVAL;
2713
2714 /* Old-style private controls are not allowed for
2715 extended controls */
2716 if (id >= V4L2_CID_PRIVATE_BASE)
2717 return -EINVAL;
2718 ref = find_ref_lock(hdl, id);
2719 if (ref == NULL)
2720 return -EINVAL;
2721 ctrl = ref->ctrl;
2722 if (ctrl->flags & V4L2_CTRL_FLAG_DISABLED)
2723 return -EINVAL;
2724
2725 if (ctrl->cluster[0]->ncontrols > 1)
2726 have_clusters = true;
2727 if (ctrl->cluster[0] != ctrl)
2728 ref = find_ref_lock(hdl, ctrl->cluster[0]->id);
2729 if (ctrl->is_ptr && !ctrl->is_string) {
2730 unsigned tot_size = ctrl->elems * ctrl->elem_size;
2731
2732 if (c->size < tot_size) {
2733 if (get) {
2734 c->size = tot_size;
2735 return -ENOSPC;
2736 }
2737 return -EFAULT;
2738 }
2739 c->size = tot_size;
2740 }
2741 /* Store the ref to the master control of the cluster */
2742 h->mref = ref;
2743 h->ctrl = ctrl;
2744 /* Initially set next to 0, meaning that there is no other
2745 control in this helper array belonging to the same
2746 cluster */
2747 h->next = 0;
2748 }
2749
2750 /* We are done if there were no controls that belong to a multi-
2751 control cluster. */
2752 if (!have_clusters)
2753 return 0;
2754
2755 /* The code below figures out in O(n) time which controls in the list
2756 belong to the same cluster. */
2757
2758 /* This has to be done with the handler lock taken. */
2759 mutex_lock(hdl->lock);
2760
2761 /* First zero the helper field in the master control references */
2762 for (i = 0; i < cs->count; i++)
2763 helpers[i].mref->helper = NULL;
2764 for (i = 0, h = helpers; i < cs->count; i++, h++) {
2765 struct v4l2_ctrl_ref *mref = h->mref;
2766
2767 /* If the mref->helper is set, then it points to an earlier
2768 helper that belongs to the same cluster. */
2769 if (mref->helper) {
2770 /* Set the next field of mref->helper to the current
2771 index: this means that that earlier helper now
2772 points to the next helper in the same cluster. */
2773 mref->helper->next = i;
2774 /* mref should be set only for the first helper in the
2775 cluster, clear the others. */
2776 h->mref = NULL;
2777 }
2778 /* Point the mref helper to the current helper struct. */
2779 mref->helper = h;
2780 }
2781 mutex_unlock(hdl->lock);
2782 return 0;
2783 }
2784
2785 /* Handles the corner case where cs->count == 0. It checks whether the
2786 specified control class exists. If that class ID is 0, then it checks
2787 whether there are any controls at all. */
2788 static int class_check(struct v4l2_ctrl_handler *hdl, u32 ctrl_class)
2789 {
2790 if (ctrl_class == 0)
2791 return list_empty(&hdl->ctrl_refs) ? -EINVAL : 0;
2792 return find_ref_lock(hdl, ctrl_class | 1) ? 0 : -EINVAL;
2793 }
2794
2795
2796
2797 /* Get extended controls. Allocates the helpers array if needed. */
2798 int v4l2_g_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *cs)
2799 {
2800 struct v4l2_ctrl_helper helper[4];
2801 struct v4l2_ctrl_helper *helpers = helper;
2802 int ret;
2803 int i, j;
2804
2805 cs->error_idx = cs->count;
2806 cs->ctrl_class = V4L2_CTRL_ID2CLASS(cs->ctrl_class);
2807
2808 if (hdl == NULL)
2809 return -EINVAL;
2810
2811 if (cs->count == 0)
2812 return class_check(hdl, cs->ctrl_class);
2813
2814 if (cs->count > ARRAY_SIZE(helper)) {
2815 helpers = kmalloc_array(cs->count, sizeof(helper[0]),
2816 GFP_KERNEL);
2817 if (helpers == NULL)
2818 return -ENOMEM;
2819 }
2820
2821 ret = prepare_ext_ctrls(hdl, cs, helpers, true);
2822 cs->error_idx = cs->count;
2823
2824 for (i = 0; !ret && i < cs->count; i++)
2825 if (helpers[i].ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY)
2826 ret = -EACCES;
2827
2828 for (i = 0; !ret && i < cs->count; i++) {
2829 int (*ctrl_to_user)(struct v4l2_ext_control *c,
2830 struct v4l2_ctrl *ctrl) = cur_to_user;
2831 struct v4l2_ctrl *master;
2832
2833 if (helpers[i].mref == NULL)
2834 continue;
2835
2836 master = helpers[i].mref->ctrl;
2837 cs->error_idx = i;
2838
2839 v4l2_ctrl_lock(master);
2840
2841 /* g_volatile_ctrl will update the new control values */
2842 if ((master->flags & V4L2_CTRL_FLAG_VOLATILE) ||
2843 (master->has_volatiles && !is_cur_manual(master))) {
2844 for (j = 0; j < master->ncontrols; j++)
2845 cur_to_new(master->cluster[j]);
2846 ret = call_op(master, g_volatile_ctrl);
2847 ctrl_to_user = new_to_user;
2848 }
2849 /* If OK, then copy the current (for non-volatile controls)
2850 or the new (for volatile controls) control values to the
2851 caller */
2852 if (!ret) {
2853 u32 idx = i;
2854
2855 do {
2856 ret = ctrl_to_user(cs->controls + idx,
2857 helpers[idx].ctrl);
2858 idx = helpers[idx].next;
2859 } while (!ret && idx);
2860 }
2861 v4l2_ctrl_unlock(master);
2862 }
2863
2864 if (cs->count > ARRAY_SIZE(helper))
2865 kfree(helpers);
2866 return ret;
2867 }
2868 EXPORT_SYMBOL(v4l2_g_ext_ctrls);
2869
2870 int v4l2_subdev_g_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs)
2871 {
2872 return v4l2_g_ext_ctrls(sd->ctrl_handler, cs);
2873 }
2874 EXPORT_SYMBOL(v4l2_subdev_g_ext_ctrls);
2875
2876 /* Helper function to get a single control */
2877 static int get_ctrl(struct v4l2_ctrl *ctrl, struct v4l2_ext_control *c)
2878 {
2879 struct v4l2_ctrl *master = ctrl->cluster[0];
2880 int ret = 0;
2881 int i;
2882
2883 /* Compound controls are not supported. The new_to_user() and
2884 * cur_to_user() calls below would need to be modified not to access
2885 * userspace memory when called from get_ctrl().
2886 */
2887 if (!ctrl->is_int)
2888 return -EINVAL;
2889
2890 if (ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY)
2891 return -EACCES;
2892
2893 v4l2_ctrl_lock(master);
2894 /* g_volatile_ctrl will update the current control values */
2895 if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE) {
2896 for (i = 0; i < master->ncontrols; i++)
2897 cur_to_new(master->cluster[i]);
2898 ret = call_op(master, g_volatile_ctrl);
2899 new_to_user(c, ctrl);
2900 } else {
2901 cur_to_user(c, ctrl);
2902 }
2903 v4l2_ctrl_unlock(master);
2904 return ret;
2905 }
2906
2907 int v4l2_g_ctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_control *control)
2908 {
2909 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, control->id);
2910 struct v4l2_ext_control c;
2911 int ret;
2912
2913 if (ctrl == NULL || !ctrl->is_int)
2914 return -EINVAL;
2915 ret = get_ctrl(ctrl, &c);
2916 control->value = c.value;
2917 return ret;
2918 }
2919 EXPORT_SYMBOL(v4l2_g_ctrl);
2920
2921 int v4l2_subdev_g_ctrl(struct v4l2_subdev *sd, struct v4l2_control *control)
2922 {
2923 return v4l2_g_ctrl(sd->ctrl_handler, control);
2924 }
2925 EXPORT_SYMBOL(v4l2_subdev_g_ctrl);
2926
2927 s32 v4l2_ctrl_g_ctrl(struct v4l2_ctrl *ctrl)
2928 {
2929 struct v4l2_ext_control c;
2930
2931 /* It's a driver bug if this happens. */
2932 WARN_ON(!ctrl->is_int);
2933 c.value = 0;
2934 get_ctrl(ctrl, &c);
2935 return c.value;
2936 }
2937 EXPORT_SYMBOL(v4l2_ctrl_g_ctrl);
2938
2939 s64 v4l2_ctrl_g_ctrl_int64(struct v4l2_ctrl *ctrl)
2940 {
2941 struct v4l2_ext_control c;
2942
2943 /* It's a driver bug if this happens. */
2944 WARN_ON(ctrl->is_ptr || ctrl->type != V4L2_CTRL_TYPE_INTEGER64);
2945 c.value = 0;
2946 get_ctrl(ctrl, &c);
2947 return c.value;
2948 }
2949 EXPORT_SYMBOL(v4l2_ctrl_g_ctrl_int64);
2950
2951
2952 /* Core function that calls try/s_ctrl and ensures that the new value is
2953 copied to the current value on a set.
2954 Must be called with ctrl->handler->lock held. */
2955 static int try_or_set_cluster(struct v4l2_fh *fh, struct v4l2_ctrl *master,
2956 bool set, u32 ch_flags)
2957 {
2958 bool update_flag;
2959 int ret;
2960 int i;
2961
2962 /* Go through the cluster and either validate the new value or
2963 (if no new value was set), copy the current value to the new
2964 value, ensuring a consistent view for the control ops when
2965 called. */
2966 for (i = 0; i < master->ncontrols; i++) {
2967 struct v4l2_ctrl *ctrl = master->cluster[i];
2968
2969 if (ctrl == NULL)
2970 continue;
2971
2972 if (!ctrl->is_new) {
2973 cur_to_new(ctrl);
2974 continue;
2975 }
2976 /* Check again: it may have changed since the
2977 previous check in try_or_set_ext_ctrls(). */
2978 if (set && (ctrl->flags & V4L2_CTRL_FLAG_GRABBED))
2979 return -EBUSY;
2980 }
2981
2982 ret = call_op(master, try_ctrl);
2983
2984 /* Don't set if there is no change */
2985 if (ret || !set || !cluster_changed(master))
2986 return ret;
2987 ret = call_op(master, s_ctrl);
2988 if (ret)
2989 return ret;
2990
2991 /* If OK, then make the new values permanent. */
2992 update_flag = is_cur_manual(master) != is_new_manual(master);
2993 for (i = 0; i < master->ncontrols; i++)
2994 new_to_cur(fh, master->cluster[i], ch_flags |
2995 ((update_flag && i > 0) ? V4L2_EVENT_CTRL_CH_FLAGS : 0));
2996 return 0;
2997 }
2998
2999 /* Validate controls. */
3000 static int validate_ctrls(struct v4l2_ext_controls *cs,
3001 struct v4l2_ctrl_helper *helpers, bool set)
3002 {
3003 unsigned i;
3004 int ret = 0;
3005
3006 cs->error_idx = cs->count;
3007 for (i = 0; i < cs->count; i++) {
3008 struct v4l2_ctrl *ctrl = helpers[i].ctrl;
3009 union v4l2_ctrl_ptr p_new;
3010
3011 cs->error_idx = i;
3012
3013 if (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY)
3014 return -EACCES;
3015 /* This test is also done in try_set_control_cluster() which
3016 is called in atomic context, so that has the final say,
3017 but it makes sense to do an up-front check as well. Once
3018 an error occurs in try_set_control_cluster() some other
3019 controls may have been set already and we want to do a
3020 best-effort to avoid that. */
3021 if (set && (ctrl->flags & V4L2_CTRL_FLAG_GRABBED))
3022 return -EBUSY;
3023 /*
3024 * Skip validation for now if the payload needs to be copied
3025 * from userspace into kernelspace. We'll validate those later.
3026 */
3027 if (ctrl->is_ptr)
3028 continue;
3029 if (ctrl->type == V4L2_CTRL_TYPE_INTEGER64)
3030 p_new.p_s64 = &cs->controls[i].value64;
3031 else
3032 p_new.p_s32 = &cs->controls[i].value;
3033 ret = validate_new(ctrl, p_new);
3034 if (ret)
3035 return ret;
3036 }
3037 return 0;
3038 }
3039
3040 /* Obtain the current volatile values of an autocluster and mark them
3041 as new. */
3042 static void update_from_auto_cluster(struct v4l2_ctrl *master)
3043 {
3044 int i;
3045
3046 for (i = 0; i < master->ncontrols; i++)
3047 cur_to_new(master->cluster[i]);
3048 if (!call_op(master, g_volatile_ctrl))
3049 for (i = 1; i < master->ncontrols; i++)
3050 if (master->cluster[i])
3051 master->cluster[i]->is_new = 1;
3052 }
3053
3054 /* Try or try-and-set controls */
3055 static int try_set_ext_ctrls(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
3056 struct v4l2_ext_controls *cs,
3057 bool set)
3058 {
3059 struct v4l2_ctrl_helper helper[4];
3060 struct v4l2_ctrl_helper *helpers = helper;
3061 unsigned i, j;
3062 int ret;
3063
3064 cs->error_idx = cs->count;
3065 cs->ctrl_class = V4L2_CTRL_ID2CLASS(cs->ctrl_class);
3066
3067 if (hdl == NULL)
3068 return -EINVAL;
3069
3070 if (cs->count == 0)
3071 return class_check(hdl, cs->ctrl_class);
3072
3073 if (cs->count > ARRAY_SIZE(helper)) {
3074 helpers = kmalloc_array(cs->count, sizeof(helper[0]),
3075 GFP_KERNEL);
3076 if (!helpers)
3077 return -ENOMEM;
3078 }
3079 ret = prepare_ext_ctrls(hdl, cs, helpers, false);
3080 if (!ret)
3081 ret = validate_ctrls(cs, helpers, set);
3082 if (ret && set)
3083 cs->error_idx = cs->count;
3084 for (i = 0; !ret && i < cs->count; i++) {
3085 struct v4l2_ctrl *master;
3086 u32 idx = i;
3087
3088 if (helpers[i].mref == NULL)
3089 continue;
3090
3091 cs->error_idx = i;
3092 master = helpers[i].mref->ctrl;
3093 v4l2_ctrl_lock(master);
3094
3095 /* Reset the 'is_new' flags of the cluster */
3096 for (j = 0; j < master->ncontrols; j++)
3097 if (master->cluster[j])
3098 master->cluster[j]->is_new = 0;
3099
3100 /* For volatile autoclusters that are currently in auto mode
3101 we need to discover if it will be set to manual mode.
3102 If so, then we have to copy the current volatile values
3103 first since those will become the new manual values (which
3104 may be overwritten by explicit new values from this set
3105 of controls). */
3106 if (master->is_auto && master->has_volatiles &&
3107 !is_cur_manual(master)) {
3108 /* Pick an initial non-manual value */
3109 s32 new_auto_val = master->manual_mode_value + 1;
3110 u32 tmp_idx = idx;
3111
3112 do {
3113 /* Check if the auto control is part of the
3114 list, and remember the new value. */
3115 if (helpers[tmp_idx].ctrl == master)
3116 new_auto_val = cs->controls[tmp_idx].value;
3117 tmp_idx = helpers[tmp_idx].next;
3118 } while (tmp_idx);
3119 /* If the new value == the manual value, then copy
3120 the current volatile values. */
3121 if (new_auto_val == master->manual_mode_value)
3122 update_from_auto_cluster(master);
3123 }
3124
3125 /* Copy the new caller-supplied control values.
3126 user_to_new() sets 'is_new' to 1. */
3127 do {
3128 struct v4l2_ctrl *ctrl = helpers[idx].ctrl;
3129
3130 ret = user_to_new(cs->controls + idx, ctrl);
3131 if (!ret && ctrl->is_ptr)
3132 ret = validate_new(ctrl, ctrl->p_new);
3133 idx = helpers[idx].next;
3134 } while (!ret && idx);
3135
3136 if (!ret)
3137 ret = try_or_set_cluster(fh, master, set, 0);
3138
3139 /* Copy the new values back to userspace. */
3140 if (!ret) {
3141 idx = i;
3142 do {
3143 ret = new_to_user(cs->controls + idx,
3144 helpers[idx].ctrl);
3145 idx = helpers[idx].next;
3146 } while (!ret && idx);
3147 }
3148 v4l2_ctrl_unlock(master);
3149 }
3150
3151 if (cs->count > ARRAY_SIZE(helper))
3152 kfree(helpers);
3153 return ret;
3154 }
3155
3156 int v4l2_try_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *cs)
3157 {
3158 return try_set_ext_ctrls(NULL, hdl, cs, false);
3159 }
3160 EXPORT_SYMBOL(v4l2_try_ext_ctrls);
3161
3162 int v4l2_s_ext_ctrls(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
3163 struct v4l2_ext_controls *cs)
3164 {
3165 return try_set_ext_ctrls(fh, hdl, cs, true);
3166 }
3167 EXPORT_SYMBOL(v4l2_s_ext_ctrls);
3168
3169 int v4l2_subdev_try_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs)
3170 {
3171 return try_set_ext_ctrls(NULL, sd->ctrl_handler, cs, false);
3172 }
3173 EXPORT_SYMBOL(v4l2_subdev_try_ext_ctrls);
3174
3175 int v4l2_subdev_s_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs)
3176 {
3177 return try_set_ext_ctrls(NULL, sd->ctrl_handler, cs, true);
3178 }
3179 EXPORT_SYMBOL(v4l2_subdev_s_ext_ctrls);
3180
3181 /* Helper function for VIDIOC_S_CTRL compatibility */
3182 static int set_ctrl(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, u32 ch_flags)
3183 {
3184 struct v4l2_ctrl *master = ctrl->cluster[0];
3185 int ret;
3186 int i;
3187
3188 /* Reset the 'is_new' flags of the cluster */
3189 for (i = 0; i < master->ncontrols; i++)
3190 if (master->cluster[i])
3191 master->cluster[i]->is_new = 0;
3192
3193 ret = validate_new(ctrl, ctrl->p_new);
3194 if (ret)
3195 return ret;
3196
3197 /* For autoclusters with volatiles that are switched from auto to
3198 manual mode we have to update the current volatile values since
3199 those will become the initial manual values after such a switch. */
3200 if (master->is_auto && master->has_volatiles && ctrl == master &&
3201 !is_cur_manual(master) && ctrl->val == master->manual_mode_value)
3202 update_from_auto_cluster(master);
3203
3204 ctrl->is_new = 1;
3205 return try_or_set_cluster(fh, master, true, ch_flags);
3206 }
3207
3208 /* Helper function for VIDIOC_S_CTRL compatibility */
3209 static int set_ctrl_lock(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl,
3210 struct v4l2_ext_control *c)
3211 {
3212 int ret;
3213
3214 v4l2_ctrl_lock(ctrl);
3215 user_to_new(c, ctrl);
3216 ret = set_ctrl(fh, ctrl, 0);
3217 if (!ret)
3218 cur_to_user(c, ctrl);
3219 v4l2_ctrl_unlock(ctrl);
3220 return ret;
3221 }
3222
3223 int v4l2_s_ctrl(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
3224 struct v4l2_control *control)
3225 {
3226 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, control->id);
3227 struct v4l2_ext_control c = { control->id };
3228 int ret;
3229
3230 if (ctrl == NULL || !ctrl->is_int)
3231 return -EINVAL;
3232
3233 if (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY)
3234 return -EACCES;
3235
3236 c.value = control->value;
3237 ret = set_ctrl_lock(fh, ctrl, &c);
3238 control->value = c.value;
3239 return ret;
3240 }
3241 EXPORT_SYMBOL(v4l2_s_ctrl);
3242
3243 int v4l2_subdev_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *control)
3244 {
3245 return v4l2_s_ctrl(NULL, sd->ctrl_handler, control);
3246 }
3247 EXPORT_SYMBOL(v4l2_subdev_s_ctrl);
3248
3249 int __v4l2_ctrl_s_ctrl(struct v4l2_ctrl *ctrl, s32 val)
3250 {
3251 lockdep_assert_held(ctrl->handler->lock);
3252
3253 /* It's a driver bug if this happens. */
3254 WARN_ON(!ctrl->is_int);
3255 ctrl->val = val;
3256 return set_ctrl(NULL, ctrl, 0);
3257 }
3258 EXPORT_SYMBOL(__v4l2_ctrl_s_ctrl);
3259
3260 int __v4l2_ctrl_s_ctrl_int64(struct v4l2_ctrl *ctrl, s64 val)
3261 {
3262 lockdep_assert_held(ctrl->handler->lock);
3263
3264 /* It's a driver bug if this happens. */
3265 WARN_ON(ctrl->is_ptr || ctrl->type != V4L2_CTRL_TYPE_INTEGER64);
3266 *ctrl->p_new.p_s64 = val;
3267 return set_ctrl(NULL, ctrl, 0);
3268 }
3269 EXPORT_SYMBOL(__v4l2_ctrl_s_ctrl_int64);
3270
3271 int __v4l2_ctrl_s_ctrl_string(struct v4l2_ctrl *ctrl, const char *s)
3272 {
3273 lockdep_assert_held(ctrl->handler->lock);
3274
3275 /* It's a driver bug if this happens. */
3276 WARN_ON(ctrl->type != V4L2_CTRL_TYPE_STRING);
3277 strlcpy(ctrl->p_new.p_char, s, ctrl->maximum + 1);
3278 return set_ctrl(NULL, ctrl, 0);
3279 }
3280 EXPORT_SYMBOL(__v4l2_ctrl_s_ctrl_string);
3281
3282 void v4l2_ctrl_notify(struct v4l2_ctrl *ctrl, v4l2_ctrl_notify_fnc notify, void *priv)
3283 {
3284 if (ctrl == NULL)
3285 return;
3286 if (notify == NULL) {
3287 ctrl->call_notify = 0;
3288 return;
3289 }
3290 if (WARN_ON(ctrl->handler->notify && ctrl->handler->notify != notify))
3291 return;
3292 ctrl->handler->notify = notify;
3293 ctrl->handler->notify_priv = priv;
3294 ctrl->call_notify = 1;
3295 }
3296 EXPORT_SYMBOL(v4l2_ctrl_notify);
3297
3298 int __v4l2_ctrl_modify_range(struct v4l2_ctrl *ctrl,
3299 s64 min, s64 max, u64 step, s64 def)
3300 {
3301 bool changed;
3302 int ret;
3303
3304 lockdep_assert_held(ctrl->handler->lock);
3305
3306 switch (ctrl->type) {
3307 case V4L2_CTRL_TYPE_INTEGER:
3308 case V4L2_CTRL_TYPE_INTEGER64:
3309 case V4L2_CTRL_TYPE_BOOLEAN:
3310 case V4L2_CTRL_TYPE_MENU:
3311 case V4L2_CTRL_TYPE_INTEGER_MENU:
3312 case V4L2_CTRL_TYPE_BITMASK:
3313 case V4L2_CTRL_TYPE_U8:
3314 case V4L2_CTRL_TYPE_U16:
3315 case V4L2_CTRL_TYPE_U32:
3316 if (ctrl->is_array)
3317 return -EINVAL;
3318 ret = check_range(ctrl->type, min, max, step, def);
3319 if (ret)
3320 return ret;
3321 break;
3322 default:
3323 return -EINVAL;
3324 }
3325 ctrl->minimum = min;
3326 ctrl->maximum = max;
3327 ctrl->step = step;
3328 ctrl->default_value = def;
3329 cur_to_new(ctrl);
3330 if (validate_new(ctrl, ctrl->p_new)) {
3331 if (ctrl->type == V4L2_CTRL_TYPE_INTEGER64)
3332 *ctrl->p_new.p_s64 = def;
3333 else
3334 *ctrl->p_new.p_s32 = def;
3335 }
3336
3337 if (ctrl->type == V4L2_CTRL_TYPE_INTEGER64)
3338 changed = *ctrl->p_new.p_s64 != *ctrl->p_cur.p_s64;
3339 else
3340 changed = *ctrl->p_new.p_s32 != *ctrl->p_cur.p_s32;
3341 if (changed)
3342 ret = set_ctrl(NULL, ctrl, V4L2_EVENT_CTRL_CH_RANGE);
3343 else
3344 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_RANGE);
3345 return ret;
3346 }
3347 EXPORT_SYMBOL(__v4l2_ctrl_modify_range);
3348
3349 static int v4l2_ctrl_add_event(struct v4l2_subscribed_event *sev, unsigned elems)
3350 {
3351 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(sev->fh->ctrl_handler, sev->id);
3352
3353 if (ctrl == NULL)
3354 return -EINVAL;
3355
3356 v4l2_ctrl_lock(ctrl);
3357 list_add_tail(&sev->node, &ctrl->ev_subs);
3358 if (ctrl->type != V4L2_CTRL_TYPE_CTRL_CLASS &&
3359 (sev->flags & V4L2_EVENT_SUB_FL_SEND_INITIAL)) {
3360 struct v4l2_event ev;
3361 u32 changes = V4L2_EVENT_CTRL_CH_FLAGS;
3362
3363 if (!(ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY))
3364 changes |= V4L2_EVENT_CTRL_CH_VALUE;
3365 fill_event(&ev, ctrl, changes);
3366 /* Mark the queue as active, allowing this initial
3367 event to be accepted. */
3368 sev->elems = elems;
3369 v4l2_event_queue_fh(sev->fh, &ev);
3370 }
3371 v4l2_ctrl_unlock(ctrl);
3372 return 0;
3373 }
3374
3375 static void v4l2_ctrl_del_event(struct v4l2_subscribed_event *sev)
3376 {
3377 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(sev->fh->ctrl_handler, sev->id);
3378
3379 v4l2_ctrl_lock(ctrl);
3380 list_del(&sev->node);
3381 v4l2_ctrl_unlock(ctrl);
3382 }
3383
3384 void v4l2_ctrl_replace(struct v4l2_event *old, const struct v4l2_event *new)
3385 {
3386 u32 old_changes = old->u.ctrl.changes;
3387
3388 old->u.ctrl = new->u.ctrl;
3389 old->u.ctrl.changes |= old_changes;
3390 }
3391 EXPORT_SYMBOL(v4l2_ctrl_replace);
3392
3393 void v4l2_ctrl_merge(const struct v4l2_event *old, struct v4l2_event *new)
3394 {
3395 new->u.ctrl.changes |= old->u.ctrl.changes;
3396 }
3397 EXPORT_SYMBOL(v4l2_ctrl_merge);
3398
3399 const struct v4l2_subscribed_event_ops v4l2_ctrl_sub_ev_ops = {
3400 .add = v4l2_ctrl_add_event,
3401 .del = v4l2_ctrl_del_event,
3402 .replace = v4l2_ctrl_replace,
3403 .merge = v4l2_ctrl_merge,
3404 };
3405 EXPORT_SYMBOL(v4l2_ctrl_sub_ev_ops);
3406
3407 int v4l2_ctrl_log_status(struct file *file, void *fh)
3408 {
3409 struct video_device *vfd = video_devdata(file);
3410 struct v4l2_fh *vfh = file->private_data;
3411
3412 if (test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags) && vfd->v4l2_dev)
3413 v4l2_ctrl_handler_log_status(vfh->ctrl_handler,
3414 vfd->v4l2_dev->name);
3415 return 0;
3416 }
3417 EXPORT_SYMBOL(v4l2_ctrl_log_status);
3418
3419 int v4l2_ctrl_subscribe_event(struct v4l2_fh *fh,
3420 const struct v4l2_event_subscription *sub)
3421 {
3422 if (sub->type == V4L2_EVENT_CTRL)
3423 return v4l2_event_subscribe(fh, sub, 0, &v4l2_ctrl_sub_ev_ops);
3424 return -EINVAL;
3425 }
3426 EXPORT_SYMBOL(v4l2_ctrl_subscribe_event);
3427
3428 int v4l2_ctrl_subdev_subscribe_event(struct v4l2_subdev *sd, struct v4l2_fh *fh,
3429 struct v4l2_event_subscription *sub)
3430 {
3431 if (!sd->ctrl_handler)
3432 return -EINVAL;
3433 return v4l2_ctrl_subscribe_event(fh, sub);
3434 }
3435 EXPORT_SYMBOL(v4l2_ctrl_subdev_subscribe_event);
3436
3437 unsigned int v4l2_ctrl_poll(struct file *file, struct poll_table_struct *wait)
3438 {
3439 struct v4l2_fh *fh = file->private_data;
3440
3441 if (v4l2_event_pending(fh))
3442 return POLLPRI;
3443 poll_wait(file, &fh->wait, wait);
3444 return 0;
3445 }
3446 EXPORT_SYMBOL(v4l2_ctrl_poll);
Linux kernel - Deliverables
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