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Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
[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
466
467 switch (id) {
468 case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ:
469 return mpeg_audio_sampling_freq;
470 case V4L2_CID_MPEG_AUDIO_ENCODING:
471 return mpeg_audio_encoding;
472 case V4L2_CID_MPEG_AUDIO_L1_BITRATE:
473 return mpeg_audio_l1_bitrate;
474 case V4L2_CID_MPEG_AUDIO_L2_BITRATE:
475 return mpeg_audio_l2_bitrate;
476 case V4L2_CID_MPEG_AUDIO_L3_BITRATE:
477 return mpeg_audio_l3_bitrate;
478 case V4L2_CID_MPEG_AUDIO_AC3_BITRATE:
479 return mpeg_audio_ac3_bitrate;
480 case V4L2_CID_MPEG_AUDIO_MODE:
481 return mpeg_audio_mode;
482 case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION:
483 return mpeg_audio_mode_extension;
484 case V4L2_CID_MPEG_AUDIO_EMPHASIS:
485 return mpeg_audio_emphasis;
486 case V4L2_CID_MPEG_AUDIO_CRC:
487 return mpeg_audio_crc;
488 case V4L2_CID_MPEG_AUDIO_DEC_PLAYBACK:
489 case V4L2_CID_MPEG_AUDIO_DEC_MULTILINGUAL_PLAYBACK:
490 return mpeg_audio_dec_playback;
491 case V4L2_CID_MPEG_VIDEO_ENCODING:
492 return mpeg_video_encoding;
493 case V4L2_CID_MPEG_VIDEO_ASPECT:
494 return mpeg_video_aspect;
495 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
496 return mpeg_video_bitrate_mode;
497 case V4L2_CID_MPEG_STREAM_TYPE:
498 return mpeg_stream_type;
499 case V4L2_CID_MPEG_STREAM_VBI_FMT:
500 return mpeg_stream_vbi_fmt;
501 case V4L2_CID_POWER_LINE_FREQUENCY:
502 return camera_power_line_frequency;
503 case V4L2_CID_EXPOSURE_AUTO:
504 return camera_exposure_auto;
505 case V4L2_CID_EXPOSURE_METERING:
506 return camera_exposure_metering;
507 case V4L2_CID_AUTO_FOCUS_RANGE:
508 return camera_auto_focus_range;
509 case V4L2_CID_COLORFX:
510 return colorfx;
511 case V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE:
512 return auto_n_preset_white_balance;
513 case V4L2_CID_ISO_SENSITIVITY_AUTO:
514 return camera_iso_sensitivity_auto;
515 case V4L2_CID_SCENE_MODE:
516 return scene_mode;
517 case V4L2_CID_TUNE_PREEMPHASIS:
518 return tune_emphasis;
519 case V4L2_CID_TUNE_DEEMPHASIS:
520 return tune_emphasis;
521 case V4L2_CID_FLASH_LED_MODE:
522 return flash_led_mode;
523 case V4L2_CID_FLASH_STROBE_SOURCE:
524 return flash_strobe_source;
525 case V4L2_CID_MPEG_VIDEO_HEADER_MODE:
526 return header_mode;
527 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE:
528 return multi_slice;
529 case V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE:
530 return entropy_mode;
531 case V4L2_CID_MPEG_VIDEO_H264_LEVEL:
532 return mpeg_h264_level;
533 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE:
534 return h264_loop_filter;
535 case V4L2_CID_MPEG_VIDEO_H264_PROFILE:
536 return h264_profile;
537 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC:
538 return vui_sar_idc;
539 case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE:
540 return h264_fp_arrangement_type;
541 case V4L2_CID_MPEG_VIDEO_H264_FMO_MAP_TYPE:
542 return h264_fmo_map_type;
543 case V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL:
544 return mpeg_mpeg4_level;
545 case V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE:
546 return mpeg4_profile;
547 case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_SEL:
548 return vpx_golden_frame_sel;
549 case V4L2_CID_JPEG_CHROMA_SUBSAMPLING:
550 return jpeg_chroma_subsampling;
551 case V4L2_CID_DV_TX_MODE:
552 return dv_tx_mode;
553 case V4L2_CID_DV_TX_RGB_RANGE:
554 case V4L2_CID_DV_RX_RGB_RANGE:
555 return dv_rgb_range;
556
557 default:
558 return NULL;
559 }
560 }
561 EXPORT_SYMBOL(v4l2_ctrl_get_menu);
562
563 #define __v4l2_qmenu_int_len(arr, len) ({ *(len) = ARRAY_SIZE(arr); arr; })
564 /*
565 * Returns NULL or an s64 type array containing the menu for given
566 * control ID. The total number of the menu items is returned in @len.
567 */
568 const s64 *v4l2_ctrl_get_int_menu(u32 id, u32 *len)
569 {
570 static const s64 qmenu_int_vpx_num_partitions[] = {
571 1, 2, 4, 8,
572 };
573
574 static const s64 qmenu_int_vpx_num_ref_frames[] = {
575 1, 2, 3,
576 };
577
578 switch (id) {
579 case V4L2_CID_MPEG_VIDEO_VPX_NUM_PARTITIONS:
580 return __v4l2_qmenu_int_len(qmenu_int_vpx_num_partitions, len);
581 case V4L2_CID_MPEG_VIDEO_VPX_NUM_REF_FRAMES:
582 return __v4l2_qmenu_int_len(qmenu_int_vpx_num_ref_frames, len);
583 default:
584 *len = 0;
585 return NULL;
586 }
587 }
588 EXPORT_SYMBOL(v4l2_ctrl_get_int_menu);
589
590 /* Return the control name. */
591 const char *v4l2_ctrl_get_name(u32 id)
592 {
593 switch (id) {
594 /* USER controls */
595 /* Keep the order of the 'case's the same as in videodev2.h! */
596 case V4L2_CID_USER_CLASS: return "User Controls";
597 case V4L2_CID_BRIGHTNESS: return "Brightness";
598 case V4L2_CID_CONTRAST: return "Contrast";
599 case V4L2_CID_SATURATION: return "Saturation";
600 case V4L2_CID_HUE: return "Hue";
601 case V4L2_CID_AUDIO_VOLUME: return "Volume";
602 case V4L2_CID_AUDIO_BALANCE: return "Balance";
603 case V4L2_CID_AUDIO_BASS: return "Bass";
604 case V4L2_CID_AUDIO_TREBLE: return "Treble";
605 case V4L2_CID_AUDIO_MUTE: return "Mute";
606 case V4L2_CID_AUDIO_LOUDNESS: return "Loudness";
607 case V4L2_CID_BLACK_LEVEL: return "Black Level";
608 case V4L2_CID_AUTO_WHITE_BALANCE: return "White Balance, Automatic";
609 case V4L2_CID_DO_WHITE_BALANCE: return "Do White Balance";
610 case V4L2_CID_RED_BALANCE: return "Red Balance";
611 case V4L2_CID_BLUE_BALANCE: return "Blue Balance";
612 case V4L2_CID_GAMMA: return "Gamma";
613 case V4L2_CID_EXPOSURE: return "Exposure";
614 case V4L2_CID_AUTOGAIN: return "Gain, Automatic";
615 case V4L2_CID_GAIN: return "Gain";
616 case V4L2_CID_HFLIP: return "Horizontal Flip";
617 case V4L2_CID_VFLIP: return "Vertical Flip";
618 case V4L2_CID_POWER_LINE_FREQUENCY: return "Power Line Frequency";
619 case V4L2_CID_HUE_AUTO: return "Hue, Automatic";
620 case V4L2_CID_WHITE_BALANCE_TEMPERATURE: return "White Balance Temperature";
621 case V4L2_CID_SHARPNESS: return "Sharpness";
622 case V4L2_CID_BACKLIGHT_COMPENSATION: return "Backlight Compensation";
623 case V4L2_CID_CHROMA_AGC: return "Chroma AGC";
624 case V4L2_CID_COLOR_KILLER: return "Color Killer";
625 case V4L2_CID_COLORFX: return "Color Effects";
626 case V4L2_CID_AUTOBRIGHTNESS: return "Brightness, Automatic";
627 case V4L2_CID_BAND_STOP_FILTER: return "Band-Stop Filter";
628 case V4L2_CID_ROTATE: return "Rotate";
629 case V4L2_CID_BG_COLOR: return "Background Color";
630 case V4L2_CID_CHROMA_GAIN: return "Chroma Gain";
631 case V4L2_CID_ILLUMINATORS_1: return "Illuminator 1";
632 case V4L2_CID_ILLUMINATORS_2: return "Illuminator 2";
633 case V4L2_CID_MIN_BUFFERS_FOR_CAPTURE: return "Min Number of Capture Buffers";
634 case V4L2_CID_MIN_BUFFERS_FOR_OUTPUT: return "Min Number of Output Buffers";
635 case V4L2_CID_ALPHA_COMPONENT: return "Alpha Component";
636 case V4L2_CID_COLORFX_CBCR: return "Color Effects, CbCr";
637
638 /* Codec controls */
639 /* The MPEG controls are applicable to all codec controls
640 * and the 'MPEG' part of the define is historical */
641 /* Keep the order of the 'case's the same as in videodev2.h! */
642 case V4L2_CID_MPEG_CLASS: return "Codec Controls";
643 case V4L2_CID_MPEG_STREAM_TYPE: return "Stream Type";
644 case V4L2_CID_MPEG_STREAM_PID_PMT: return "Stream PMT Program ID";
645 case V4L2_CID_MPEG_STREAM_PID_AUDIO: return "Stream Audio Program ID";
646 case V4L2_CID_MPEG_STREAM_PID_VIDEO: return "Stream Video Program ID";
647 case V4L2_CID_MPEG_STREAM_PID_PCR: return "Stream PCR Program ID";
648 case V4L2_CID_MPEG_STREAM_PES_ID_AUDIO: return "Stream PES Audio ID";
649 case V4L2_CID_MPEG_STREAM_PES_ID_VIDEO: return "Stream PES Video ID";
650 case V4L2_CID_MPEG_STREAM_VBI_FMT: return "Stream VBI Format";
651 case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ: return "Audio Sampling Frequency";
652 case V4L2_CID_MPEG_AUDIO_ENCODING: return "Audio Encoding";
653 case V4L2_CID_MPEG_AUDIO_L1_BITRATE: return "Audio Layer I Bitrate";
654 case V4L2_CID_MPEG_AUDIO_L2_BITRATE: return "Audio Layer II Bitrate";
655 case V4L2_CID_MPEG_AUDIO_L3_BITRATE: return "Audio Layer III Bitrate";
656 case V4L2_CID_MPEG_AUDIO_MODE: return "Audio Stereo Mode";
657 case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION: return "Audio Stereo Mode Extension";
658 case V4L2_CID_MPEG_AUDIO_EMPHASIS: return "Audio Emphasis";
659 case V4L2_CID_MPEG_AUDIO_CRC: return "Audio CRC";
660 case V4L2_CID_MPEG_AUDIO_MUTE: return "Audio Mute";
661 case V4L2_CID_MPEG_AUDIO_AAC_BITRATE: return "Audio AAC Bitrate";
662 case V4L2_CID_MPEG_AUDIO_AC3_BITRATE: return "Audio AC-3 Bitrate";
663 case V4L2_CID_MPEG_AUDIO_DEC_PLAYBACK: return "Audio Playback";
664 case V4L2_CID_MPEG_AUDIO_DEC_MULTILINGUAL_PLAYBACK: return "Audio Multilingual Playback";
665 case V4L2_CID_MPEG_VIDEO_ENCODING: return "Video Encoding";
666 case V4L2_CID_MPEG_VIDEO_ASPECT: return "Video Aspect";
667 case V4L2_CID_MPEG_VIDEO_B_FRAMES: return "Video B Frames";
668 case V4L2_CID_MPEG_VIDEO_GOP_SIZE: return "Video GOP Size";
669 case V4L2_CID_MPEG_VIDEO_GOP_CLOSURE: return "Video GOP Closure";
670 case V4L2_CID_MPEG_VIDEO_PULLDOWN: return "Video Pulldown";
671 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE: return "Video Bitrate Mode";
672 case V4L2_CID_MPEG_VIDEO_BITRATE: return "Video Bitrate";
673 case V4L2_CID_MPEG_VIDEO_BITRATE_PEAK: return "Video Peak Bitrate";
674 case V4L2_CID_MPEG_VIDEO_TEMPORAL_DECIMATION: return "Video Temporal Decimation";
675 case V4L2_CID_MPEG_VIDEO_MUTE: return "Video Mute";
676 case V4L2_CID_MPEG_VIDEO_MUTE_YUV: return "Video Mute YUV";
677 case V4L2_CID_MPEG_VIDEO_DECODER_SLICE_INTERFACE: return "Decoder Slice Interface";
678 case V4L2_CID_MPEG_VIDEO_DECODER_MPEG4_DEBLOCK_FILTER: return "MPEG4 Loop Filter Enable";
679 case V4L2_CID_MPEG_VIDEO_CYCLIC_INTRA_REFRESH_MB: return "Number of Intra Refresh MBs";
680 case V4L2_CID_MPEG_VIDEO_FRAME_RC_ENABLE: return "Frame Level Rate Control Enable";
681 case V4L2_CID_MPEG_VIDEO_MB_RC_ENABLE: return "H264 MB Level Rate Control";
682 case V4L2_CID_MPEG_VIDEO_HEADER_MODE: return "Sequence Header Mode";
683 case V4L2_CID_MPEG_VIDEO_MAX_REF_PIC: return "Max Number of Reference Pics";
684 case V4L2_CID_MPEG_VIDEO_H263_I_FRAME_QP: return "H263 I-Frame QP Value";
685 case V4L2_CID_MPEG_VIDEO_H263_P_FRAME_QP: return "H263 P-Frame QP Value";
686 case V4L2_CID_MPEG_VIDEO_H263_B_FRAME_QP: return "H263 B-Frame QP Value";
687 case V4L2_CID_MPEG_VIDEO_H263_MIN_QP: return "H263 Minimum QP Value";
688 case V4L2_CID_MPEG_VIDEO_H263_MAX_QP: return "H263 Maximum QP Value";
689 case V4L2_CID_MPEG_VIDEO_H264_I_FRAME_QP: return "H264 I-Frame QP Value";
690 case V4L2_CID_MPEG_VIDEO_H264_P_FRAME_QP: return "H264 P-Frame QP Value";
691 case V4L2_CID_MPEG_VIDEO_H264_B_FRAME_QP: return "H264 B-Frame QP Value";
692 case V4L2_CID_MPEG_VIDEO_H264_MAX_QP: return "H264 Maximum QP Value";
693 case V4L2_CID_MPEG_VIDEO_H264_MIN_QP: return "H264 Minimum QP Value";
694 case V4L2_CID_MPEG_VIDEO_H264_8X8_TRANSFORM: return "H264 8x8 Transform Enable";
695 case V4L2_CID_MPEG_VIDEO_H264_CPB_SIZE: return "H264 CPB Buffer Size";
696 case V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE: return "H264 Entropy Mode";
697 case V4L2_CID_MPEG_VIDEO_H264_I_PERIOD: return "H264 I-Frame Period";
698 case V4L2_CID_MPEG_VIDEO_H264_LEVEL: return "H264 Level";
699 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_ALPHA: return "H264 Loop Filter Alpha Offset";
700 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_BETA: return "H264 Loop Filter Beta Offset";
701 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE: return "H264 Loop Filter Mode";
702 case V4L2_CID_MPEG_VIDEO_H264_PROFILE: return "H264 Profile";
703 case V4L2_CID_MPEG_VIDEO_H264_VUI_EXT_SAR_HEIGHT: return "Vertical Size of SAR";
704 case V4L2_CID_MPEG_VIDEO_H264_VUI_EXT_SAR_WIDTH: return "Horizontal Size of SAR";
705 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_ENABLE: return "Aspect Ratio VUI Enable";
706 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC: return "VUI Aspect Ratio IDC";
707 case V4L2_CID_MPEG_VIDEO_H264_SEI_FRAME_PACKING: return "H264 Enable Frame Packing SEI";
708 case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_CURRENT_FRAME_0: return "H264 Set Curr. Frame as Frame0";
709 case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE: return "H264 FP Arrangement Type";
710 case V4L2_CID_MPEG_VIDEO_H264_FMO: return "H264 Flexible MB Ordering";
711 case V4L2_CID_MPEG_VIDEO_H264_FMO_MAP_TYPE: return "H264 Map Type for FMO";
712 case V4L2_CID_MPEG_VIDEO_H264_FMO_SLICE_GROUP: return "H264 FMO Number of Slice Groups";
713 case V4L2_CID_MPEG_VIDEO_H264_FMO_CHANGE_DIRECTION: return "H264 FMO Direction of Change";
714 case V4L2_CID_MPEG_VIDEO_H264_FMO_CHANGE_RATE: return "H264 FMO Size of 1st Slice Grp";
715 case V4L2_CID_MPEG_VIDEO_H264_FMO_RUN_LENGTH: return "H264 FMO No. of Consecutive MBs";
716 case V4L2_CID_MPEG_VIDEO_H264_ASO: return "H264 Arbitrary Slice Ordering";
717 case V4L2_CID_MPEG_VIDEO_H264_ASO_SLICE_ORDER: return "H264 ASO Slice Order";
718 case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING: return "Enable H264 Hierarchical Coding";
719 case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_TYPE: return "H264 Hierarchical Coding Type";
720 case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_LAYER:return "H264 Number of HC Layers";
721 case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_LAYER_QP:
722 return "H264 Set QP Value for HC Layers";
723 case V4L2_CID_MPEG_VIDEO_MPEG4_I_FRAME_QP: return "MPEG4 I-Frame QP Value";
724 case V4L2_CID_MPEG_VIDEO_MPEG4_P_FRAME_QP: return "MPEG4 P-Frame QP Value";
725 case V4L2_CID_MPEG_VIDEO_MPEG4_B_FRAME_QP: return "MPEG4 B-Frame QP Value";
726 case V4L2_CID_MPEG_VIDEO_MPEG4_MIN_QP: return "MPEG4 Minimum QP Value";
727 case V4L2_CID_MPEG_VIDEO_MPEG4_MAX_QP: return "MPEG4 Maximum QP Value";
728 case V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL: return "MPEG4 Level";
729 case V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE: return "MPEG4 Profile";
730 case V4L2_CID_MPEG_VIDEO_MPEG4_QPEL: return "Quarter Pixel Search Enable";
731 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MAX_BYTES: return "Maximum Bytes in a Slice";
732 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MAX_MB: return "Number of MBs in a Slice";
733 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE: return "Slice Partitioning Method";
734 case V4L2_CID_MPEG_VIDEO_VBV_SIZE: return "VBV Buffer Size";
735 case V4L2_CID_MPEG_VIDEO_DEC_PTS: return "Video Decoder PTS";
736 case V4L2_CID_MPEG_VIDEO_DEC_FRAME: return "Video Decoder Frame Count";
737 case V4L2_CID_MPEG_VIDEO_VBV_DELAY: return "Initial Delay for VBV Control";
738 case V4L2_CID_MPEG_VIDEO_MV_H_SEARCH_RANGE: return "Horizontal MV Search Range";
739 case V4L2_CID_MPEG_VIDEO_MV_V_SEARCH_RANGE: return "Vertical MV Search Range";
740 case V4L2_CID_MPEG_VIDEO_REPEAT_SEQ_HEADER: return "Repeat Sequence Header";
741
742 /* VPX controls */
743 case V4L2_CID_MPEG_VIDEO_VPX_NUM_PARTITIONS: return "VPX Number of Partitions";
744 case V4L2_CID_MPEG_VIDEO_VPX_IMD_DISABLE_4X4: return "VPX Intra Mode Decision Disable";
745 case V4L2_CID_MPEG_VIDEO_VPX_NUM_REF_FRAMES: return "VPX No. of Refs for P Frame";
746 case V4L2_CID_MPEG_VIDEO_VPX_FILTER_LEVEL: return "VPX Loop Filter Level Range";
747 case V4L2_CID_MPEG_VIDEO_VPX_FILTER_SHARPNESS: return "VPX Deblocking Effect Control";
748 case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_REF_PERIOD: return "VPX Golden Frame Refresh Period";
749 case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_SEL: return "VPX Golden Frame Indicator";
750 case V4L2_CID_MPEG_VIDEO_VPX_MIN_QP: return "VPX Minimum QP Value";
751 case V4L2_CID_MPEG_VIDEO_VPX_MAX_QP: return "VPX Maximum QP Value";
752 case V4L2_CID_MPEG_VIDEO_VPX_I_FRAME_QP: return "VPX I-Frame QP Value";
753 case V4L2_CID_MPEG_VIDEO_VPX_P_FRAME_QP: return "VPX P-Frame QP Value";
754 case V4L2_CID_MPEG_VIDEO_VPX_PROFILE: return "VPX Profile";
755
756 /* CAMERA controls */
757 /* Keep the order of the 'case's the same as in videodev2.h! */
758 case V4L2_CID_CAMERA_CLASS: return "Camera Controls";
759 case V4L2_CID_EXPOSURE_AUTO: return "Auto Exposure";
760 case V4L2_CID_EXPOSURE_ABSOLUTE: return "Exposure Time, Absolute";
761 case V4L2_CID_EXPOSURE_AUTO_PRIORITY: return "Exposure, Dynamic Framerate";
762 case V4L2_CID_PAN_RELATIVE: return "Pan, Relative";
763 case V4L2_CID_TILT_RELATIVE: return "Tilt, Relative";
764 case V4L2_CID_PAN_RESET: return "Pan, Reset";
765 case V4L2_CID_TILT_RESET: return "Tilt, Reset";
766 case V4L2_CID_PAN_ABSOLUTE: return "Pan, Absolute";
767 case V4L2_CID_TILT_ABSOLUTE: return "Tilt, Absolute";
768 case V4L2_CID_FOCUS_ABSOLUTE: return "Focus, Absolute";
769 case V4L2_CID_FOCUS_RELATIVE: return "Focus, Relative";
770 case V4L2_CID_FOCUS_AUTO: return "Focus, Automatic Continuous";
771 case V4L2_CID_ZOOM_ABSOLUTE: return "Zoom, Absolute";
772 case V4L2_CID_ZOOM_RELATIVE: return "Zoom, Relative";
773 case V4L2_CID_ZOOM_CONTINUOUS: return "Zoom, Continuous";
774 case V4L2_CID_PRIVACY: return "Privacy";
775 case V4L2_CID_IRIS_ABSOLUTE: return "Iris, Absolute";
776 case V4L2_CID_IRIS_RELATIVE: return "Iris, Relative";
777 case V4L2_CID_AUTO_EXPOSURE_BIAS: return "Auto Exposure, Bias";
778 case V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE: return "White Balance, Auto & Preset";
779 case V4L2_CID_WIDE_DYNAMIC_RANGE: return "Wide Dynamic Range";
780 case V4L2_CID_IMAGE_STABILIZATION: return "Image Stabilization";
781 case V4L2_CID_ISO_SENSITIVITY: return "ISO Sensitivity";
782 case V4L2_CID_ISO_SENSITIVITY_AUTO: return "ISO Sensitivity, Auto";
783 case V4L2_CID_EXPOSURE_METERING: return "Exposure, Metering Mode";
784 case V4L2_CID_SCENE_MODE: return "Scene Mode";
785 case V4L2_CID_3A_LOCK: return "3A Lock";
786 case V4L2_CID_AUTO_FOCUS_START: return "Auto Focus, Start";
787 case V4L2_CID_AUTO_FOCUS_STOP: return "Auto Focus, Stop";
788 case V4L2_CID_AUTO_FOCUS_STATUS: return "Auto Focus, Status";
789 case V4L2_CID_AUTO_FOCUS_RANGE: return "Auto Focus, Range";
790
791 /* FM Radio Modulator control */
792 /* Keep the order of the 'case's the same as in videodev2.h! */
793 case V4L2_CID_FM_TX_CLASS: return "FM Radio Modulator Controls";
794 case V4L2_CID_RDS_TX_DEVIATION: return "RDS Signal Deviation";
795 case V4L2_CID_RDS_TX_PI: return "RDS Program ID";
796 case V4L2_CID_RDS_TX_PTY: return "RDS Program Type";
797 case V4L2_CID_RDS_TX_PS_NAME: return "RDS PS Name";
798 case V4L2_CID_RDS_TX_RADIO_TEXT: return "RDS Radio Text";
799 case V4L2_CID_AUDIO_LIMITER_ENABLED: return "Audio Limiter Feature Enabled";
800 case V4L2_CID_AUDIO_LIMITER_RELEASE_TIME: return "Audio Limiter Release Time";
801 case V4L2_CID_AUDIO_LIMITER_DEVIATION: return "Audio Limiter Deviation";
802 case V4L2_CID_AUDIO_COMPRESSION_ENABLED: return "Audio Compression Enabled";
803 case V4L2_CID_AUDIO_COMPRESSION_GAIN: return "Audio Compression Gain";
804 case V4L2_CID_AUDIO_COMPRESSION_THRESHOLD: return "Audio Compression Threshold";
805 case V4L2_CID_AUDIO_COMPRESSION_ATTACK_TIME: return "Audio Compression Attack Time";
806 case V4L2_CID_AUDIO_COMPRESSION_RELEASE_TIME: return "Audio Compression Release Time";
807 case V4L2_CID_PILOT_TONE_ENABLED: return "Pilot Tone Feature Enabled";
808 case V4L2_CID_PILOT_TONE_DEVIATION: return "Pilot Tone Deviation";
809 case V4L2_CID_PILOT_TONE_FREQUENCY: return "Pilot Tone Frequency";
810 case V4L2_CID_TUNE_PREEMPHASIS: return "Pre-Emphasis";
811 case V4L2_CID_TUNE_POWER_LEVEL: return "Tune Power Level";
812 case V4L2_CID_TUNE_ANTENNA_CAPACITOR: return "Tune Antenna Capacitor";
813
814 /* Flash controls */
815 case V4L2_CID_FLASH_CLASS: return "Flash Controls";
816 case V4L2_CID_FLASH_LED_MODE: return "LED Mode";
817 case V4L2_CID_FLASH_STROBE_SOURCE: return "Strobe Source";
818 case V4L2_CID_FLASH_STROBE: return "Strobe";
819 case V4L2_CID_FLASH_STROBE_STOP: return "Stop Strobe";
820 case V4L2_CID_FLASH_STROBE_STATUS: return "Strobe Status";
821 case V4L2_CID_FLASH_TIMEOUT: return "Strobe Timeout";
822 case V4L2_CID_FLASH_INTENSITY: return "Intensity, Flash Mode";
823 case V4L2_CID_FLASH_TORCH_INTENSITY: return "Intensity, Torch Mode";
824 case V4L2_CID_FLASH_INDICATOR_INTENSITY: return "Intensity, Indicator";
825 case V4L2_CID_FLASH_FAULT: return "Faults";
826 case V4L2_CID_FLASH_CHARGE: return "Charge";
827 case V4L2_CID_FLASH_READY: return "Ready to Strobe";
828
829 /* JPEG encoder controls */
830 /* Keep the order of the 'case's the same as in videodev2.h! */
831 case V4L2_CID_JPEG_CLASS: return "JPEG Compression Controls";
832 case V4L2_CID_JPEG_CHROMA_SUBSAMPLING: return "Chroma Subsampling";
833 case V4L2_CID_JPEG_RESTART_INTERVAL: return "Restart Interval";
834 case V4L2_CID_JPEG_COMPRESSION_QUALITY: return "Compression Quality";
835 case V4L2_CID_JPEG_ACTIVE_MARKER: return "Active Markers";
836
837 /* Image source controls */
838 case V4L2_CID_IMAGE_SOURCE_CLASS: return "Image Source Controls";
839 case V4L2_CID_VBLANK: return "Vertical Blanking";
840 case V4L2_CID_HBLANK: return "Horizontal Blanking";
841 case V4L2_CID_ANALOGUE_GAIN: return "Analogue Gain";
842
843 /* Image processing controls */
844 case V4L2_CID_IMAGE_PROC_CLASS: return "Image Processing Controls";
845 case V4L2_CID_LINK_FREQ: return "Link Frequency";
846 case V4L2_CID_PIXEL_RATE: return "Pixel Rate";
847 case V4L2_CID_TEST_PATTERN: return "Test Pattern";
848
849 /* DV controls */
850 case V4L2_CID_DV_CLASS: return "Digital Video Controls";
851 case V4L2_CID_DV_TX_HOTPLUG: return "Hotplug Present";
852 case V4L2_CID_DV_TX_RXSENSE: return "RxSense Present";
853 case V4L2_CID_DV_TX_EDID_PRESENT: return "EDID Present";
854 case V4L2_CID_DV_TX_MODE: return "Transmit Mode";
855 case V4L2_CID_DV_TX_RGB_RANGE: return "Tx RGB Quantization Range";
856 case V4L2_CID_DV_RX_POWER_PRESENT: return "Power Present";
857 case V4L2_CID_DV_RX_RGB_RANGE: return "Rx RGB Quantization Range";
858
859 case V4L2_CID_FM_RX_CLASS: return "FM Radio Receiver Controls";
860 case V4L2_CID_TUNE_DEEMPHASIS: return "De-Emphasis";
861 case V4L2_CID_RDS_RECEPTION: return "RDS Reception";
862
863 case V4L2_CID_RF_TUNER_CLASS: return "RF Tuner Controls";
864 case V4L2_CID_RF_TUNER_LNA_GAIN_AUTO: return "LNA Gain, Auto";
865 case V4L2_CID_RF_TUNER_LNA_GAIN: return "LNA Gain";
866 case V4L2_CID_RF_TUNER_MIXER_GAIN_AUTO: return "Mixer Gain, Auto";
867 case V4L2_CID_RF_TUNER_MIXER_GAIN: return "Mixer Gain";
868 case V4L2_CID_RF_TUNER_IF_GAIN_AUTO: return "IF Gain, Auto";
869 case V4L2_CID_RF_TUNER_IF_GAIN: return "IF Gain";
870 case V4L2_CID_RF_TUNER_BANDWIDTH_AUTO: return "Bandwidth, Auto";
871 case V4L2_CID_RF_TUNER_BANDWIDTH: return "Bandwidth";
872 case V4L2_CID_RF_TUNER_PLL_LOCK: return "PLL Lock";
873 default:
874 return NULL;
875 }
876 }
877 EXPORT_SYMBOL(v4l2_ctrl_get_name);
878
879 void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type,
880 s32 *min, s32 *max, s32 *step, s32 *def, u32 *flags)
881 {
882 *name = v4l2_ctrl_get_name(id);
883 *flags = 0;
884
885 switch (id) {
886 case V4L2_CID_AUDIO_MUTE:
887 case V4L2_CID_AUDIO_LOUDNESS:
888 case V4L2_CID_AUTO_WHITE_BALANCE:
889 case V4L2_CID_AUTOGAIN:
890 case V4L2_CID_HFLIP:
891 case V4L2_CID_VFLIP:
892 case V4L2_CID_HUE_AUTO:
893 case V4L2_CID_CHROMA_AGC:
894 case V4L2_CID_COLOR_KILLER:
895 case V4L2_CID_AUTOBRIGHTNESS:
896 case V4L2_CID_MPEG_AUDIO_MUTE:
897 case V4L2_CID_MPEG_VIDEO_MUTE:
898 case V4L2_CID_MPEG_VIDEO_GOP_CLOSURE:
899 case V4L2_CID_MPEG_VIDEO_PULLDOWN:
900 case V4L2_CID_EXPOSURE_AUTO_PRIORITY:
901 case V4L2_CID_FOCUS_AUTO:
902 case V4L2_CID_PRIVACY:
903 case V4L2_CID_AUDIO_LIMITER_ENABLED:
904 case V4L2_CID_AUDIO_COMPRESSION_ENABLED:
905 case V4L2_CID_PILOT_TONE_ENABLED:
906 case V4L2_CID_ILLUMINATORS_1:
907 case V4L2_CID_ILLUMINATORS_2:
908 case V4L2_CID_FLASH_STROBE_STATUS:
909 case V4L2_CID_FLASH_CHARGE:
910 case V4L2_CID_FLASH_READY:
911 case V4L2_CID_MPEG_VIDEO_DECODER_MPEG4_DEBLOCK_FILTER:
912 case V4L2_CID_MPEG_VIDEO_DECODER_SLICE_INTERFACE:
913 case V4L2_CID_MPEG_VIDEO_FRAME_RC_ENABLE:
914 case V4L2_CID_MPEG_VIDEO_MB_RC_ENABLE:
915 case V4L2_CID_MPEG_VIDEO_H264_8X8_TRANSFORM:
916 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_ENABLE:
917 case V4L2_CID_MPEG_VIDEO_MPEG4_QPEL:
918 case V4L2_CID_MPEG_VIDEO_REPEAT_SEQ_HEADER:
919 case V4L2_CID_WIDE_DYNAMIC_RANGE:
920 case V4L2_CID_IMAGE_STABILIZATION:
921 case V4L2_CID_RDS_RECEPTION:
922 case V4L2_CID_RF_TUNER_LNA_GAIN_AUTO:
923 case V4L2_CID_RF_TUNER_MIXER_GAIN_AUTO:
924 case V4L2_CID_RF_TUNER_IF_GAIN_AUTO:
925 case V4L2_CID_RF_TUNER_BANDWIDTH_AUTO:
926 case V4L2_CID_RF_TUNER_PLL_LOCK:
927 *type = V4L2_CTRL_TYPE_BOOLEAN;
928 *min = 0;
929 *max = *step = 1;
930 break;
931 case V4L2_CID_MPEG_VIDEO_MV_H_SEARCH_RANGE:
932 case V4L2_CID_MPEG_VIDEO_MV_V_SEARCH_RANGE:
933 *type = V4L2_CTRL_TYPE_INTEGER;
934 break;
935 case V4L2_CID_PAN_RESET:
936 case V4L2_CID_TILT_RESET:
937 case V4L2_CID_FLASH_STROBE:
938 case V4L2_CID_FLASH_STROBE_STOP:
939 case V4L2_CID_AUTO_FOCUS_START:
940 case V4L2_CID_AUTO_FOCUS_STOP:
941 *type = V4L2_CTRL_TYPE_BUTTON;
942 *flags |= V4L2_CTRL_FLAG_WRITE_ONLY;
943 *min = *max = *step = *def = 0;
944 break;
945 case V4L2_CID_POWER_LINE_FREQUENCY:
946 case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ:
947 case V4L2_CID_MPEG_AUDIO_ENCODING:
948 case V4L2_CID_MPEG_AUDIO_L1_BITRATE:
949 case V4L2_CID_MPEG_AUDIO_L2_BITRATE:
950 case V4L2_CID_MPEG_AUDIO_L3_BITRATE:
951 case V4L2_CID_MPEG_AUDIO_AC3_BITRATE:
952 case V4L2_CID_MPEG_AUDIO_MODE:
953 case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION:
954 case V4L2_CID_MPEG_AUDIO_EMPHASIS:
955 case V4L2_CID_MPEG_AUDIO_CRC:
956 case V4L2_CID_MPEG_AUDIO_DEC_PLAYBACK:
957 case V4L2_CID_MPEG_AUDIO_DEC_MULTILINGUAL_PLAYBACK:
958 case V4L2_CID_MPEG_VIDEO_ENCODING:
959 case V4L2_CID_MPEG_VIDEO_ASPECT:
960 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
961 case V4L2_CID_MPEG_STREAM_TYPE:
962 case V4L2_CID_MPEG_STREAM_VBI_FMT:
963 case V4L2_CID_EXPOSURE_AUTO:
964 case V4L2_CID_AUTO_FOCUS_RANGE:
965 case V4L2_CID_COLORFX:
966 case V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE:
967 case V4L2_CID_TUNE_PREEMPHASIS:
968 case V4L2_CID_FLASH_LED_MODE:
969 case V4L2_CID_FLASH_STROBE_SOURCE:
970 case V4L2_CID_MPEG_VIDEO_HEADER_MODE:
971 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE:
972 case V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE:
973 case V4L2_CID_MPEG_VIDEO_H264_LEVEL:
974 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE:
975 case V4L2_CID_MPEG_VIDEO_H264_PROFILE:
976 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC:
977 case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE:
978 case V4L2_CID_MPEG_VIDEO_H264_FMO_MAP_TYPE:
979 case V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL:
980 case V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE:
981 case V4L2_CID_JPEG_CHROMA_SUBSAMPLING:
982 case V4L2_CID_ISO_SENSITIVITY_AUTO:
983 case V4L2_CID_EXPOSURE_METERING:
984 case V4L2_CID_SCENE_MODE:
985 case V4L2_CID_DV_TX_MODE:
986 case V4L2_CID_DV_TX_RGB_RANGE:
987 case V4L2_CID_DV_RX_RGB_RANGE:
988 case V4L2_CID_TEST_PATTERN:
989 case V4L2_CID_TUNE_DEEMPHASIS:
990 case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_SEL:
991 *type = V4L2_CTRL_TYPE_MENU;
992 break;
993 case V4L2_CID_LINK_FREQ:
994 *type = V4L2_CTRL_TYPE_INTEGER_MENU;
995 break;
996 case V4L2_CID_RDS_TX_PS_NAME:
997 case V4L2_CID_RDS_TX_RADIO_TEXT:
998 *type = V4L2_CTRL_TYPE_STRING;
999 break;
1000 case V4L2_CID_ISO_SENSITIVITY:
1001 case V4L2_CID_AUTO_EXPOSURE_BIAS:
1002 case V4L2_CID_MPEG_VIDEO_VPX_NUM_PARTITIONS:
1003 case V4L2_CID_MPEG_VIDEO_VPX_NUM_REF_FRAMES:
1004 *type = V4L2_CTRL_TYPE_INTEGER_MENU;
1005 break;
1006 case V4L2_CID_USER_CLASS:
1007 case V4L2_CID_CAMERA_CLASS:
1008 case V4L2_CID_MPEG_CLASS:
1009 case V4L2_CID_FM_TX_CLASS:
1010 case V4L2_CID_FLASH_CLASS:
1011 case V4L2_CID_JPEG_CLASS:
1012 case V4L2_CID_IMAGE_SOURCE_CLASS:
1013 case V4L2_CID_IMAGE_PROC_CLASS:
1014 case V4L2_CID_DV_CLASS:
1015 case V4L2_CID_FM_RX_CLASS:
1016 case V4L2_CID_RF_TUNER_CLASS:
1017 *type = V4L2_CTRL_TYPE_CTRL_CLASS;
1018 /* You can neither read not write these */
1019 *flags |= V4L2_CTRL_FLAG_READ_ONLY | V4L2_CTRL_FLAG_WRITE_ONLY;
1020 *min = *max = *step = *def = 0;
1021 break;
1022 case V4L2_CID_BG_COLOR:
1023 *type = V4L2_CTRL_TYPE_INTEGER;
1024 *step = 1;
1025 *min = 0;
1026 /* Max is calculated as RGB888 that is 2^24 */
1027 *max = 0xFFFFFF;
1028 break;
1029 case V4L2_CID_FLASH_FAULT:
1030 case V4L2_CID_JPEG_ACTIVE_MARKER:
1031 case V4L2_CID_3A_LOCK:
1032 case V4L2_CID_AUTO_FOCUS_STATUS:
1033 case V4L2_CID_DV_TX_HOTPLUG:
1034 case V4L2_CID_DV_TX_RXSENSE:
1035 case V4L2_CID_DV_TX_EDID_PRESENT:
1036 case V4L2_CID_DV_RX_POWER_PRESENT:
1037 *type = V4L2_CTRL_TYPE_BITMASK;
1038 break;
1039 case V4L2_CID_MIN_BUFFERS_FOR_CAPTURE:
1040 case V4L2_CID_MIN_BUFFERS_FOR_OUTPUT:
1041 *type = V4L2_CTRL_TYPE_INTEGER;
1042 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
1043 break;
1044 case V4L2_CID_MPEG_VIDEO_DEC_FRAME:
1045 case V4L2_CID_MPEG_VIDEO_DEC_PTS:
1046 *flags |= V4L2_CTRL_FLAG_VOLATILE;
1047 /* Fall through */
1048 case V4L2_CID_PIXEL_RATE:
1049 *type = V4L2_CTRL_TYPE_INTEGER64;
1050 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
1051 *min = *max = *step = *def = 0;
1052 break;
1053 default:
1054 *type = V4L2_CTRL_TYPE_INTEGER;
1055 break;
1056 }
1057 switch (id) {
1058 case V4L2_CID_MPEG_AUDIO_ENCODING:
1059 case V4L2_CID_MPEG_AUDIO_MODE:
1060 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
1061 case V4L2_CID_MPEG_VIDEO_B_FRAMES:
1062 case V4L2_CID_MPEG_STREAM_TYPE:
1063 *flags |= V4L2_CTRL_FLAG_UPDATE;
1064 break;
1065 case V4L2_CID_AUDIO_VOLUME:
1066 case V4L2_CID_AUDIO_BALANCE:
1067 case V4L2_CID_AUDIO_BASS:
1068 case V4L2_CID_AUDIO_TREBLE:
1069 case V4L2_CID_BRIGHTNESS:
1070 case V4L2_CID_CONTRAST:
1071 case V4L2_CID_SATURATION:
1072 case V4L2_CID_HUE:
1073 case V4L2_CID_RED_BALANCE:
1074 case V4L2_CID_BLUE_BALANCE:
1075 case V4L2_CID_GAMMA:
1076 case V4L2_CID_SHARPNESS:
1077 case V4L2_CID_CHROMA_GAIN:
1078 case V4L2_CID_RDS_TX_DEVIATION:
1079 case V4L2_CID_AUDIO_LIMITER_RELEASE_TIME:
1080 case V4L2_CID_AUDIO_LIMITER_DEVIATION:
1081 case V4L2_CID_AUDIO_COMPRESSION_GAIN:
1082 case V4L2_CID_AUDIO_COMPRESSION_THRESHOLD:
1083 case V4L2_CID_AUDIO_COMPRESSION_ATTACK_TIME:
1084 case V4L2_CID_AUDIO_COMPRESSION_RELEASE_TIME:
1085 case V4L2_CID_PILOT_TONE_DEVIATION:
1086 case V4L2_CID_PILOT_TONE_FREQUENCY:
1087 case V4L2_CID_TUNE_POWER_LEVEL:
1088 case V4L2_CID_TUNE_ANTENNA_CAPACITOR:
1089 case V4L2_CID_RF_TUNER_LNA_GAIN:
1090 case V4L2_CID_RF_TUNER_MIXER_GAIN:
1091 case V4L2_CID_RF_TUNER_IF_GAIN:
1092 case V4L2_CID_RF_TUNER_BANDWIDTH:
1093 *flags |= V4L2_CTRL_FLAG_SLIDER;
1094 break;
1095 case V4L2_CID_PAN_RELATIVE:
1096 case V4L2_CID_TILT_RELATIVE:
1097 case V4L2_CID_FOCUS_RELATIVE:
1098 case V4L2_CID_IRIS_RELATIVE:
1099 case V4L2_CID_ZOOM_RELATIVE:
1100 *flags |= V4L2_CTRL_FLAG_WRITE_ONLY;
1101 break;
1102 case V4L2_CID_FLASH_STROBE_STATUS:
1103 case V4L2_CID_AUTO_FOCUS_STATUS:
1104 case V4L2_CID_FLASH_READY:
1105 case V4L2_CID_DV_TX_HOTPLUG:
1106 case V4L2_CID_DV_TX_RXSENSE:
1107 case V4L2_CID_DV_TX_EDID_PRESENT:
1108 case V4L2_CID_DV_RX_POWER_PRESENT:
1109 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
1110 break;
1111 case V4L2_CID_RF_TUNER_PLL_LOCK:
1112 *flags |= V4L2_CTRL_FLAG_VOLATILE;
1113 break;
1114 }
1115 }
1116 EXPORT_SYMBOL(v4l2_ctrl_fill);
1117
1118 /* Helper function to determine whether the control type is compatible with
1119 VIDIOC_G/S_CTRL. */
1120 static bool type_is_int(const struct v4l2_ctrl *ctrl)
1121 {
1122 switch (ctrl->type) {
1123 case V4L2_CTRL_TYPE_INTEGER64:
1124 case V4L2_CTRL_TYPE_STRING:
1125 /* Nope, these need v4l2_ext_control */
1126 return false;
1127 default:
1128 return true;
1129 }
1130 }
1131
1132 static void fill_event(struct v4l2_event *ev, struct v4l2_ctrl *ctrl, u32 changes)
1133 {
1134 memset(ev->reserved, 0, sizeof(ev->reserved));
1135 ev->type = V4L2_EVENT_CTRL;
1136 ev->id = ctrl->id;
1137 ev->u.ctrl.changes = changes;
1138 ev->u.ctrl.type = ctrl->type;
1139 ev->u.ctrl.flags = ctrl->flags;
1140 if (ctrl->type == V4L2_CTRL_TYPE_STRING)
1141 ev->u.ctrl.value64 = 0;
1142 else
1143 ev->u.ctrl.value64 = ctrl->cur.val64;
1144 ev->u.ctrl.minimum = ctrl->minimum;
1145 ev->u.ctrl.maximum = ctrl->maximum;
1146 if (ctrl->type == V4L2_CTRL_TYPE_MENU
1147 || ctrl->type == V4L2_CTRL_TYPE_INTEGER_MENU)
1148 ev->u.ctrl.step = 1;
1149 else
1150 ev->u.ctrl.step = ctrl->step;
1151 ev->u.ctrl.default_value = ctrl->default_value;
1152 }
1153
1154 static void send_event(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, u32 changes)
1155 {
1156 struct v4l2_event ev;
1157 struct v4l2_subscribed_event *sev;
1158
1159 if (list_empty(&ctrl->ev_subs))
1160 return;
1161 fill_event(&ev, ctrl, changes);
1162
1163 list_for_each_entry(sev, &ctrl->ev_subs, node)
1164 if (sev->fh != fh ||
1165 (sev->flags & V4L2_EVENT_SUB_FL_ALLOW_FEEDBACK))
1166 v4l2_event_queue_fh(sev->fh, &ev);
1167 }
1168
1169 /* Helper function: copy the current control value back to the caller */
1170 static int cur_to_user(struct v4l2_ext_control *c,
1171 struct v4l2_ctrl *ctrl)
1172 {
1173 u32 len;
1174
1175 switch (ctrl->type) {
1176 case V4L2_CTRL_TYPE_STRING:
1177 len = strlen(ctrl->cur.string);
1178 if (c->size < len + 1) {
1179 c->size = len + 1;
1180 return -ENOSPC;
1181 }
1182 return copy_to_user(c->string, ctrl->cur.string,
1183 len + 1) ? -EFAULT : 0;
1184 case V4L2_CTRL_TYPE_INTEGER64:
1185 c->value64 = ctrl->cur.val64;
1186 break;
1187 default:
1188 c->value = ctrl->cur.val;
1189 break;
1190 }
1191 return 0;
1192 }
1193
1194 /* Helper function: copy the caller-provider value as the new control value */
1195 static int user_to_new(struct v4l2_ext_control *c,
1196 struct v4l2_ctrl *ctrl)
1197 {
1198 int ret;
1199 u32 size;
1200
1201 ctrl->is_new = 1;
1202 switch (ctrl->type) {
1203 case V4L2_CTRL_TYPE_INTEGER64:
1204 ctrl->val64 = c->value64;
1205 break;
1206 case V4L2_CTRL_TYPE_STRING:
1207 size = c->size;
1208 if (size == 0)
1209 return -ERANGE;
1210 if (size > ctrl->maximum + 1)
1211 size = ctrl->maximum + 1;
1212 ret = copy_from_user(ctrl->string, c->string, size);
1213 if (!ret) {
1214 char last = ctrl->string[size - 1];
1215
1216 ctrl->string[size - 1] = 0;
1217 /* If the string was longer than ctrl->maximum,
1218 then return an error. */
1219 if (strlen(ctrl->string) == ctrl->maximum && last)
1220 return -ERANGE;
1221 }
1222 return ret ? -EFAULT : 0;
1223 default:
1224 ctrl->val = c->value;
1225 break;
1226 }
1227 return 0;
1228 }
1229
1230 /* Helper function: copy the new control value back to the caller */
1231 static int new_to_user(struct v4l2_ext_control *c,
1232 struct v4l2_ctrl *ctrl)
1233 {
1234 u32 len;
1235
1236 switch (ctrl->type) {
1237 case V4L2_CTRL_TYPE_STRING:
1238 len = strlen(ctrl->string);
1239 if (c->size < len + 1) {
1240 c->size = ctrl->maximum + 1;
1241 return -ENOSPC;
1242 }
1243 return copy_to_user(c->string, ctrl->string,
1244 len + 1) ? -EFAULT : 0;
1245 case V4L2_CTRL_TYPE_INTEGER64:
1246 c->value64 = ctrl->val64;
1247 break;
1248 default:
1249 c->value = ctrl->val;
1250 break;
1251 }
1252 return 0;
1253 }
1254
1255 /* Copy the new value to the current value. */
1256 static void new_to_cur(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, u32 ch_flags)
1257 {
1258 bool changed = false;
1259
1260 if (ctrl == NULL)
1261 return;
1262 switch (ctrl->type) {
1263 case V4L2_CTRL_TYPE_BUTTON:
1264 changed = true;
1265 break;
1266 case V4L2_CTRL_TYPE_STRING:
1267 /* strings are always 0-terminated */
1268 changed = strcmp(ctrl->string, ctrl->cur.string);
1269 strcpy(ctrl->cur.string, ctrl->string);
1270 break;
1271 case V4L2_CTRL_TYPE_INTEGER64:
1272 changed = ctrl->val64 != ctrl->cur.val64;
1273 ctrl->cur.val64 = ctrl->val64;
1274 break;
1275 default:
1276 changed = ctrl->val != ctrl->cur.val;
1277 ctrl->cur.val = ctrl->val;
1278 break;
1279 }
1280 if (ch_flags & V4L2_EVENT_CTRL_CH_FLAGS) {
1281 /* Note: CH_FLAGS is only set for auto clusters. */
1282 ctrl->flags &=
1283 ~(V4L2_CTRL_FLAG_INACTIVE | V4L2_CTRL_FLAG_VOLATILE);
1284 if (!is_cur_manual(ctrl->cluster[0])) {
1285 ctrl->flags |= V4L2_CTRL_FLAG_INACTIVE;
1286 if (ctrl->cluster[0]->has_volatiles)
1287 ctrl->flags |= V4L2_CTRL_FLAG_VOLATILE;
1288 }
1289 fh = NULL;
1290 }
1291 if (changed || ch_flags) {
1292 /* If a control was changed that was not one of the controls
1293 modified by the application, then send the event to all. */
1294 if (!ctrl->is_new)
1295 fh = NULL;
1296 send_event(fh, ctrl,
1297 (changed ? V4L2_EVENT_CTRL_CH_VALUE : 0) | ch_flags);
1298 if (ctrl->call_notify && changed && ctrl->handler->notify)
1299 ctrl->handler->notify(ctrl, ctrl->handler->notify_priv);
1300 }
1301 }
1302
1303 /* Copy the current value to the new value */
1304 static void cur_to_new(struct v4l2_ctrl *ctrl)
1305 {
1306 if (ctrl == NULL)
1307 return;
1308 switch (ctrl->type) {
1309 case V4L2_CTRL_TYPE_STRING:
1310 /* strings are always 0-terminated */
1311 strcpy(ctrl->string, ctrl->cur.string);
1312 break;
1313 case V4L2_CTRL_TYPE_INTEGER64:
1314 ctrl->val64 = ctrl->cur.val64;
1315 break;
1316 default:
1317 ctrl->val = ctrl->cur.val;
1318 break;
1319 }
1320 }
1321
1322 /* Return non-zero if one or more of the controls in the cluster has a new
1323 value that differs from the current value. */
1324 static int cluster_changed(struct v4l2_ctrl *master)
1325 {
1326 int diff = 0;
1327 int i;
1328
1329 for (i = 0; !diff && i < master->ncontrols; i++) {
1330 struct v4l2_ctrl *ctrl = master->cluster[i];
1331
1332 if (ctrl == NULL)
1333 continue;
1334 switch (ctrl->type) {
1335 case V4L2_CTRL_TYPE_BUTTON:
1336 /* Button controls are always 'different' */
1337 return 1;
1338 case V4L2_CTRL_TYPE_STRING:
1339 /* strings are always 0-terminated */
1340 diff = strcmp(ctrl->string, ctrl->cur.string);
1341 break;
1342 case V4L2_CTRL_TYPE_INTEGER64:
1343 diff = ctrl->val64 != ctrl->cur.val64;
1344 break;
1345 default:
1346 diff = ctrl->val != ctrl->cur.val;
1347 break;
1348 }
1349 }
1350 return diff;
1351 }
1352
1353 /* Control range checking */
1354 static int check_range(enum v4l2_ctrl_type type,
1355 s32 min, s32 max, u32 step, s32 def)
1356 {
1357 switch (type) {
1358 case V4L2_CTRL_TYPE_BOOLEAN:
1359 if (step != 1 || max > 1 || min < 0)
1360 return -ERANGE;
1361 /* fall through */
1362 case V4L2_CTRL_TYPE_INTEGER:
1363 if (step <= 0 || min > max || def < min || def > max)
1364 return -ERANGE;
1365 return 0;
1366 case V4L2_CTRL_TYPE_BITMASK:
1367 if (step || min || !max || (def & ~max))
1368 return -ERANGE;
1369 return 0;
1370 case V4L2_CTRL_TYPE_MENU:
1371 case V4L2_CTRL_TYPE_INTEGER_MENU:
1372 if (min > max || def < min || def > max)
1373 return -ERANGE;
1374 /* Note: step == menu_skip_mask for menu controls.
1375 So here we check if the default value is masked out. */
1376 if (step && ((1 << def) & step))
1377 return -EINVAL;
1378 return 0;
1379 case V4L2_CTRL_TYPE_STRING:
1380 if (min > max || min < 0 || step < 1 || def)
1381 return -ERANGE;
1382 return 0;
1383 default:
1384 return 0;
1385 }
1386 }
1387
1388 /* Validate a new control */
1389 static int validate_new(const struct v4l2_ctrl *ctrl,
1390 struct v4l2_ext_control *c)
1391 {
1392 size_t len;
1393 u32 offset;
1394 s32 val;
1395
1396 switch (ctrl->type) {
1397 case V4L2_CTRL_TYPE_INTEGER:
1398 /* Round towards the closest legal value */
1399 val = c->value + ctrl->step / 2;
1400 val = clamp(val, ctrl->minimum, ctrl->maximum);
1401 offset = val - ctrl->minimum;
1402 offset = ctrl->step * (offset / ctrl->step);
1403 c->value = ctrl->minimum + offset;
1404 return 0;
1405
1406 case V4L2_CTRL_TYPE_BOOLEAN:
1407 c->value = !!c->value;
1408 return 0;
1409
1410 case V4L2_CTRL_TYPE_MENU:
1411 case V4L2_CTRL_TYPE_INTEGER_MENU:
1412 if (c->value < ctrl->minimum || c->value > ctrl->maximum)
1413 return -ERANGE;
1414 if (ctrl->menu_skip_mask & (1 << c->value))
1415 return -EINVAL;
1416 if (ctrl->type == V4L2_CTRL_TYPE_MENU &&
1417 ctrl->qmenu[c->value][0] == '\0')
1418 return -EINVAL;
1419 return 0;
1420
1421 case V4L2_CTRL_TYPE_BITMASK:
1422 c->value &= ctrl->maximum;
1423 return 0;
1424
1425 case V4L2_CTRL_TYPE_BUTTON:
1426 case V4L2_CTRL_TYPE_CTRL_CLASS:
1427 c->value = 0;
1428 return 0;
1429
1430 case V4L2_CTRL_TYPE_INTEGER64:
1431 return 0;
1432
1433 case V4L2_CTRL_TYPE_STRING:
1434 len = strlen(c->string);
1435 if (len < ctrl->minimum)
1436 return -ERANGE;
1437 if ((len - ctrl->minimum) % ctrl->step)
1438 return -ERANGE;
1439 return 0;
1440
1441 default:
1442 return -EINVAL;
1443 }
1444 }
1445
1446 static inline u32 node2id(struct list_head *node)
1447 {
1448 return list_entry(node, struct v4l2_ctrl_ref, node)->ctrl->id;
1449 }
1450
1451 /* Set the handler's error code if it wasn't set earlier already */
1452 static inline int handler_set_err(struct v4l2_ctrl_handler *hdl, int err)
1453 {
1454 if (hdl->error == 0)
1455 hdl->error = err;
1456 return err;
1457 }
1458
1459 /* Initialize the handler */
1460 int v4l2_ctrl_handler_init_class(struct v4l2_ctrl_handler *hdl,
1461 unsigned nr_of_controls_hint,
1462 struct lock_class_key *key, const char *name)
1463 {
1464 hdl->lock = &hdl->_lock;
1465 mutex_init(hdl->lock);
1466 lockdep_set_class_and_name(hdl->lock, key, name);
1467 INIT_LIST_HEAD(&hdl->ctrls);
1468 INIT_LIST_HEAD(&hdl->ctrl_refs);
1469 hdl->nr_of_buckets = 1 + nr_of_controls_hint / 8;
1470 hdl->buckets = kcalloc(hdl->nr_of_buckets, sizeof(hdl->buckets[0]),
1471 GFP_KERNEL);
1472 hdl->error = hdl->buckets ? 0 : -ENOMEM;
1473 return hdl->error;
1474 }
1475 EXPORT_SYMBOL(v4l2_ctrl_handler_init_class);
1476
1477 /* Free all controls and control refs */
1478 void v4l2_ctrl_handler_free(struct v4l2_ctrl_handler *hdl)
1479 {
1480 struct v4l2_ctrl_ref *ref, *next_ref;
1481 struct v4l2_ctrl *ctrl, *next_ctrl;
1482 struct v4l2_subscribed_event *sev, *next_sev;
1483
1484 if (hdl == NULL || hdl->buckets == NULL)
1485 return;
1486
1487 mutex_lock(hdl->lock);
1488 /* Free all nodes */
1489 list_for_each_entry_safe(ref, next_ref, &hdl->ctrl_refs, node) {
1490 list_del(&ref->node);
1491 kfree(ref);
1492 }
1493 /* Free all controls owned by the handler */
1494 list_for_each_entry_safe(ctrl, next_ctrl, &hdl->ctrls, node) {
1495 list_del(&ctrl->node);
1496 list_for_each_entry_safe(sev, next_sev, &ctrl->ev_subs, node)
1497 list_del(&sev->node);
1498 kfree(ctrl);
1499 }
1500 kfree(hdl->buckets);
1501 hdl->buckets = NULL;
1502 hdl->cached = NULL;
1503 hdl->error = 0;
1504 mutex_unlock(hdl->lock);
1505 }
1506 EXPORT_SYMBOL(v4l2_ctrl_handler_free);
1507
1508 /* For backwards compatibility: V4L2_CID_PRIVATE_BASE should no longer
1509 be used except in G_CTRL, S_CTRL, QUERYCTRL and QUERYMENU when dealing
1510 with applications that do not use the NEXT_CTRL flag.
1511
1512 We just find the n-th private user control. It's O(N), but that should not
1513 be an issue in this particular case. */
1514 static struct v4l2_ctrl_ref *find_private_ref(
1515 struct v4l2_ctrl_handler *hdl, u32 id)
1516 {
1517 struct v4l2_ctrl_ref *ref;
1518
1519 id -= V4L2_CID_PRIVATE_BASE;
1520 list_for_each_entry(ref, &hdl->ctrl_refs, node) {
1521 /* Search for private user controls that are compatible with
1522 VIDIOC_G/S_CTRL. */
1523 if (V4L2_CTRL_ID2CLASS(ref->ctrl->id) == V4L2_CTRL_CLASS_USER &&
1524 V4L2_CTRL_DRIVER_PRIV(ref->ctrl->id)) {
1525 if (!type_is_int(ref->ctrl))
1526 continue;
1527 if (id == 0)
1528 return ref;
1529 id--;
1530 }
1531 }
1532 return NULL;
1533 }
1534
1535 /* Find a control with the given ID. */
1536 static struct v4l2_ctrl_ref *find_ref(struct v4l2_ctrl_handler *hdl, u32 id)
1537 {
1538 struct v4l2_ctrl_ref *ref;
1539 int bucket;
1540
1541 id &= V4L2_CTRL_ID_MASK;
1542
1543 /* Old-style private controls need special handling */
1544 if (id >= V4L2_CID_PRIVATE_BASE)
1545 return find_private_ref(hdl, id);
1546 bucket = id % hdl->nr_of_buckets;
1547
1548 /* Simple optimization: cache the last control found */
1549 if (hdl->cached && hdl->cached->ctrl->id == id)
1550 return hdl->cached;
1551
1552 /* Not in cache, search the hash */
1553 ref = hdl->buckets ? hdl->buckets[bucket] : NULL;
1554 while (ref && ref->ctrl->id != id)
1555 ref = ref->next;
1556
1557 if (ref)
1558 hdl->cached = ref; /* cache it! */
1559 return ref;
1560 }
1561
1562 /* Find a control with the given ID. Take the handler's lock first. */
1563 static struct v4l2_ctrl_ref *find_ref_lock(
1564 struct v4l2_ctrl_handler *hdl, u32 id)
1565 {
1566 struct v4l2_ctrl_ref *ref = NULL;
1567
1568 if (hdl) {
1569 mutex_lock(hdl->lock);
1570 ref = find_ref(hdl, id);
1571 mutex_unlock(hdl->lock);
1572 }
1573 return ref;
1574 }
1575
1576 /* Find a control with the given ID. */
1577 struct v4l2_ctrl *v4l2_ctrl_find(struct v4l2_ctrl_handler *hdl, u32 id)
1578 {
1579 struct v4l2_ctrl_ref *ref = find_ref_lock(hdl, id);
1580
1581 return ref ? ref->ctrl : NULL;
1582 }
1583 EXPORT_SYMBOL(v4l2_ctrl_find);
1584
1585 /* Allocate a new v4l2_ctrl_ref and hook it into the handler. */
1586 static int handler_new_ref(struct v4l2_ctrl_handler *hdl,
1587 struct v4l2_ctrl *ctrl)
1588 {
1589 struct v4l2_ctrl_ref *ref;
1590 struct v4l2_ctrl_ref *new_ref;
1591 u32 id = ctrl->id;
1592 u32 class_ctrl = V4L2_CTRL_ID2CLASS(id) | 1;
1593 int bucket = id % hdl->nr_of_buckets; /* which bucket to use */
1594
1595 /* Automatically add the control class if it is not yet present. */
1596 if (id != class_ctrl && find_ref_lock(hdl, class_ctrl) == NULL)
1597 if (!v4l2_ctrl_new_std(hdl, NULL, class_ctrl, 0, 0, 0, 0))
1598 return hdl->error;
1599
1600 if (hdl->error)
1601 return hdl->error;
1602
1603 new_ref = kzalloc(sizeof(*new_ref), GFP_KERNEL);
1604 if (!new_ref)
1605 return handler_set_err(hdl, -ENOMEM);
1606 new_ref->ctrl = ctrl;
1607 if (ctrl->handler == hdl) {
1608 /* By default each control starts in a cluster of its own.
1609 new_ref->ctrl is basically a cluster array with one
1610 element, so that's perfect to use as the cluster pointer.
1611 But only do this for the handler that owns the control. */
1612 ctrl->cluster = &new_ref->ctrl;
1613 ctrl->ncontrols = 1;
1614 }
1615
1616 INIT_LIST_HEAD(&new_ref->node);
1617
1618 mutex_lock(hdl->lock);
1619
1620 /* Add immediately at the end of the list if the list is empty, or if
1621 the last element in the list has a lower ID.
1622 This ensures that when elements are added in ascending order the
1623 insertion is an O(1) operation. */
1624 if (list_empty(&hdl->ctrl_refs) || id > node2id(hdl->ctrl_refs.prev)) {
1625 list_add_tail(&new_ref->node, &hdl->ctrl_refs);
1626 goto insert_in_hash;
1627 }
1628
1629 /* Find insert position in sorted list */
1630 list_for_each_entry(ref, &hdl->ctrl_refs, node) {
1631 if (ref->ctrl->id < id)
1632 continue;
1633 /* Don't add duplicates */
1634 if (ref->ctrl->id == id) {
1635 kfree(new_ref);
1636 goto unlock;
1637 }
1638 list_add(&new_ref->node, ref->node.prev);
1639 break;
1640 }
1641
1642 insert_in_hash:
1643 /* Insert the control node in the hash */
1644 new_ref->next = hdl->buckets[bucket];
1645 hdl->buckets[bucket] = new_ref;
1646
1647 unlock:
1648 mutex_unlock(hdl->lock);
1649 return 0;
1650 }
1651
1652 /* Add a new control */
1653 static struct v4l2_ctrl *v4l2_ctrl_new(struct v4l2_ctrl_handler *hdl,
1654 const struct v4l2_ctrl_ops *ops,
1655 u32 id, const char *name, enum v4l2_ctrl_type type,
1656 s32 min, s32 max, u32 step, s32 def,
1657 u32 flags, const char * const *qmenu,
1658 const s64 *qmenu_int, void *priv)
1659 {
1660 struct v4l2_ctrl *ctrl;
1661 unsigned sz_extra = 0;
1662 int err;
1663
1664 if (hdl->error)
1665 return NULL;
1666
1667 /* Sanity checks */
1668 if (id == 0 || name == NULL || id >= V4L2_CID_PRIVATE_BASE ||
1669 (type == V4L2_CTRL_TYPE_MENU && qmenu == NULL) ||
1670 (type == V4L2_CTRL_TYPE_INTEGER_MENU && qmenu_int == NULL)) {
1671 handler_set_err(hdl, -ERANGE);
1672 return NULL;
1673 }
1674 err = check_range(type, min, max, step, def);
1675 if (err) {
1676 handler_set_err(hdl, err);
1677 return NULL;
1678 }
1679 if (type == V4L2_CTRL_TYPE_BITMASK && ((def & ~max) || min || step)) {
1680 handler_set_err(hdl, -ERANGE);
1681 return NULL;
1682 }
1683
1684 if (type == V4L2_CTRL_TYPE_BUTTON)
1685 flags |= V4L2_CTRL_FLAG_WRITE_ONLY;
1686 else if (type == V4L2_CTRL_TYPE_CTRL_CLASS)
1687 flags |= V4L2_CTRL_FLAG_READ_ONLY;
1688 else if (type == V4L2_CTRL_TYPE_STRING)
1689 sz_extra += 2 * (max + 1);
1690
1691 ctrl = kzalloc(sizeof(*ctrl) + sz_extra, GFP_KERNEL);
1692 if (ctrl == NULL) {
1693 handler_set_err(hdl, -ENOMEM);
1694 return NULL;
1695 }
1696
1697 INIT_LIST_HEAD(&ctrl->node);
1698 INIT_LIST_HEAD(&ctrl->ev_subs);
1699 ctrl->handler = hdl;
1700 ctrl->ops = ops;
1701 ctrl->id = id;
1702 ctrl->name = name;
1703 ctrl->type = type;
1704 ctrl->flags = flags;
1705 ctrl->minimum = min;
1706 ctrl->maximum = max;
1707 ctrl->step = step;
1708 if (type == V4L2_CTRL_TYPE_MENU)
1709 ctrl->qmenu = qmenu;
1710 else if (type == V4L2_CTRL_TYPE_INTEGER_MENU)
1711 ctrl->qmenu_int = qmenu_int;
1712 ctrl->priv = priv;
1713 ctrl->cur.val = ctrl->val = ctrl->default_value = def;
1714
1715 if (ctrl->type == V4L2_CTRL_TYPE_STRING) {
1716 ctrl->cur.string = (char *)&ctrl[1] + sz_extra - (max + 1);
1717 ctrl->string = (char *)&ctrl[1] + sz_extra - 2 * (max + 1);
1718 if (ctrl->minimum)
1719 memset(ctrl->cur.string, ' ', ctrl->minimum);
1720 }
1721 if (handler_new_ref(hdl, ctrl)) {
1722 kfree(ctrl);
1723 return NULL;
1724 }
1725 mutex_lock(hdl->lock);
1726 list_add_tail(&ctrl->node, &hdl->ctrls);
1727 mutex_unlock(hdl->lock);
1728 return ctrl;
1729 }
1730
1731 struct v4l2_ctrl *v4l2_ctrl_new_custom(struct v4l2_ctrl_handler *hdl,
1732 const struct v4l2_ctrl_config *cfg, void *priv)
1733 {
1734 bool is_menu;
1735 struct v4l2_ctrl *ctrl;
1736 const char *name = cfg->name;
1737 const char * const *qmenu = cfg->qmenu;
1738 const s64 *qmenu_int = cfg->qmenu_int;
1739 enum v4l2_ctrl_type type = cfg->type;
1740 u32 flags = cfg->flags;
1741 s32 min = cfg->min;
1742 s32 max = cfg->max;
1743 u32 step = cfg->step;
1744 s32 def = cfg->def;
1745
1746 if (name == NULL)
1747 v4l2_ctrl_fill(cfg->id, &name, &type, &min, &max, &step,
1748 &def, &flags);
1749
1750 is_menu = (cfg->type == V4L2_CTRL_TYPE_MENU ||
1751 cfg->type == V4L2_CTRL_TYPE_INTEGER_MENU);
1752 if (is_menu)
1753 WARN_ON(step);
1754 else
1755 WARN_ON(cfg->menu_skip_mask);
1756 if (cfg->type == V4L2_CTRL_TYPE_MENU && qmenu == NULL)
1757 qmenu = v4l2_ctrl_get_menu(cfg->id);
1758 else if (cfg->type == V4L2_CTRL_TYPE_INTEGER_MENU &&
1759 qmenu_int == NULL) {
1760 handler_set_err(hdl, -EINVAL);
1761 return NULL;
1762 }
1763
1764 ctrl = v4l2_ctrl_new(hdl, cfg->ops, cfg->id, name,
1765 type, min, max,
1766 is_menu ? cfg->menu_skip_mask : step,
1767 def, flags, qmenu, qmenu_int, priv);
1768 if (ctrl)
1769 ctrl->is_private = cfg->is_private;
1770 return ctrl;
1771 }
1772 EXPORT_SYMBOL(v4l2_ctrl_new_custom);
1773
1774 /* Helper function for standard non-menu controls */
1775 struct v4l2_ctrl *v4l2_ctrl_new_std(struct v4l2_ctrl_handler *hdl,
1776 const struct v4l2_ctrl_ops *ops,
1777 u32 id, s32 min, s32 max, u32 step, s32 def)
1778 {
1779 const char *name;
1780 enum v4l2_ctrl_type type;
1781 u32 flags;
1782
1783 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
1784 if (type == V4L2_CTRL_TYPE_MENU
1785 || type == V4L2_CTRL_TYPE_INTEGER_MENU) {
1786 handler_set_err(hdl, -EINVAL);
1787 return NULL;
1788 }
1789 return v4l2_ctrl_new(hdl, ops, id, name, type,
1790 min, max, step, def, flags, NULL, NULL, NULL);
1791 }
1792 EXPORT_SYMBOL(v4l2_ctrl_new_std);
1793
1794 /* Helper function for standard menu controls */
1795 struct v4l2_ctrl *v4l2_ctrl_new_std_menu(struct v4l2_ctrl_handler *hdl,
1796 const struct v4l2_ctrl_ops *ops,
1797 u32 id, s32 max, s32 mask, s32 def)
1798 {
1799 const char * const *qmenu = NULL;
1800 const s64 *qmenu_int = NULL;
1801 unsigned int qmenu_int_len = 0;
1802 const char *name;
1803 enum v4l2_ctrl_type type;
1804 s32 min;
1805 s32 step;
1806 u32 flags;
1807
1808 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
1809
1810 if (type == V4L2_CTRL_TYPE_MENU)
1811 qmenu = v4l2_ctrl_get_menu(id);
1812 else if (type == V4L2_CTRL_TYPE_INTEGER_MENU)
1813 qmenu_int = v4l2_ctrl_get_int_menu(id, &qmenu_int_len);
1814
1815 if ((!qmenu && !qmenu_int) || (qmenu_int && max > qmenu_int_len)) {
1816 handler_set_err(hdl, -EINVAL);
1817 return NULL;
1818 }
1819 return v4l2_ctrl_new(hdl, ops, id, name, type,
1820 0, max, mask, def, flags, qmenu, qmenu_int, NULL);
1821 }
1822 EXPORT_SYMBOL(v4l2_ctrl_new_std_menu);
1823
1824 /* Helper function for standard menu controls with driver defined menu */
1825 struct v4l2_ctrl *v4l2_ctrl_new_std_menu_items(struct v4l2_ctrl_handler *hdl,
1826 const struct v4l2_ctrl_ops *ops, u32 id, s32 max,
1827 s32 mask, s32 def, const char * const *qmenu)
1828 {
1829 enum v4l2_ctrl_type type;
1830 const char *name;
1831 u32 flags;
1832 s32 step;
1833 s32 min;
1834
1835 /* v4l2_ctrl_new_std_menu_items() should only be called for
1836 * standard controls without a standard menu.
1837 */
1838 if (v4l2_ctrl_get_menu(id)) {
1839 handler_set_err(hdl, -EINVAL);
1840 return NULL;
1841 }
1842
1843 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
1844 if (type != V4L2_CTRL_TYPE_MENU || qmenu == NULL) {
1845 handler_set_err(hdl, -EINVAL);
1846 return NULL;
1847 }
1848 return v4l2_ctrl_new(hdl, ops, id, name, type, 0, max, mask, def,
1849 flags, qmenu, NULL, NULL);
1850
1851 }
1852 EXPORT_SYMBOL(v4l2_ctrl_new_std_menu_items);
1853
1854 /* Helper function for standard integer menu controls */
1855 struct v4l2_ctrl *v4l2_ctrl_new_int_menu(struct v4l2_ctrl_handler *hdl,
1856 const struct v4l2_ctrl_ops *ops,
1857 u32 id, s32 max, s32 def, const s64 *qmenu_int)
1858 {
1859 const char *name;
1860 enum v4l2_ctrl_type type;
1861 s32 min;
1862 s32 step;
1863 u32 flags;
1864
1865 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
1866 if (type != V4L2_CTRL_TYPE_INTEGER_MENU) {
1867 handler_set_err(hdl, -EINVAL);
1868 return NULL;
1869 }
1870 return v4l2_ctrl_new(hdl, ops, id, name, type,
1871 0, max, 0, def, flags, NULL, qmenu_int, NULL);
1872 }
1873 EXPORT_SYMBOL(v4l2_ctrl_new_int_menu);
1874
1875 /* Add a control from another handler to this handler */
1876 struct v4l2_ctrl *v4l2_ctrl_add_ctrl(struct v4l2_ctrl_handler *hdl,
1877 struct v4l2_ctrl *ctrl)
1878 {
1879 if (hdl == NULL || hdl->error)
1880 return NULL;
1881 if (ctrl == NULL) {
1882 handler_set_err(hdl, -EINVAL);
1883 return NULL;
1884 }
1885 if (ctrl->handler == hdl)
1886 return ctrl;
1887 return handler_new_ref(hdl, ctrl) ? NULL : ctrl;
1888 }
1889 EXPORT_SYMBOL(v4l2_ctrl_add_ctrl);
1890
1891 /* Add the controls from another handler to our own. */
1892 int v4l2_ctrl_add_handler(struct v4l2_ctrl_handler *hdl,
1893 struct v4l2_ctrl_handler *add,
1894 bool (*filter)(const struct v4l2_ctrl *ctrl))
1895 {
1896 struct v4l2_ctrl_ref *ref;
1897 int ret = 0;
1898
1899 /* Do nothing if either handler is NULL or if they are the same */
1900 if (!hdl || !add || hdl == add)
1901 return 0;
1902 if (hdl->error)
1903 return hdl->error;
1904 mutex_lock(add->lock);
1905 list_for_each_entry(ref, &add->ctrl_refs, node) {
1906 struct v4l2_ctrl *ctrl = ref->ctrl;
1907
1908 /* Skip handler-private controls. */
1909 if (ctrl->is_private)
1910 continue;
1911 /* And control classes */
1912 if (ctrl->type == V4L2_CTRL_TYPE_CTRL_CLASS)
1913 continue;
1914 /* Filter any unwanted controls */
1915 if (filter && !filter(ctrl))
1916 continue;
1917 ret = handler_new_ref(hdl, ctrl);
1918 if (ret)
1919 break;
1920 }
1921 mutex_unlock(add->lock);
1922 return ret;
1923 }
1924 EXPORT_SYMBOL(v4l2_ctrl_add_handler);
1925
1926 bool v4l2_ctrl_radio_filter(const struct v4l2_ctrl *ctrl)
1927 {
1928 if (V4L2_CTRL_ID2CLASS(ctrl->id) == V4L2_CTRL_CLASS_FM_TX)
1929 return true;
1930 if (V4L2_CTRL_ID2CLASS(ctrl->id) == V4L2_CTRL_CLASS_FM_RX)
1931 return true;
1932 switch (ctrl->id) {
1933 case V4L2_CID_AUDIO_MUTE:
1934 case V4L2_CID_AUDIO_VOLUME:
1935 case V4L2_CID_AUDIO_BALANCE:
1936 case V4L2_CID_AUDIO_BASS:
1937 case V4L2_CID_AUDIO_TREBLE:
1938 case V4L2_CID_AUDIO_LOUDNESS:
1939 return true;
1940 default:
1941 break;
1942 }
1943 return false;
1944 }
1945 EXPORT_SYMBOL(v4l2_ctrl_radio_filter);
1946
1947 /* Cluster controls */
1948 void v4l2_ctrl_cluster(unsigned ncontrols, struct v4l2_ctrl **controls)
1949 {
1950 bool has_volatiles = false;
1951 int i;
1952
1953 /* The first control is the master control and it must not be NULL */
1954 if (WARN_ON(ncontrols == 0 || controls[0] == NULL))
1955 return;
1956
1957 for (i = 0; i < ncontrols; i++) {
1958 if (controls[i]) {
1959 controls[i]->cluster = controls;
1960 controls[i]->ncontrols = ncontrols;
1961 if (controls[i]->flags & V4L2_CTRL_FLAG_VOLATILE)
1962 has_volatiles = true;
1963 }
1964 }
1965 controls[0]->has_volatiles = has_volatiles;
1966 }
1967 EXPORT_SYMBOL(v4l2_ctrl_cluster);
1968
1969 void v4l2_ctrl_auto_cluster(unsigned ncontrols, struct v4l2_ctrl **controls,
1970 u8 manual_val, bool set_volatile)
1971 {
1972 struct v4l2_ctrl *master = controls[0];
1973 u32 flag = 0;
1974 int i;
1975
1976 v4l2_ctrl_cluster(ncontrols, controls);
1977 WARN_ON(ncontrols <= 1);
1978 WARN_ON(manual_val < master->minimum || manual_val > master->maximum);
1979 WARN_ON(set_volatile && !has_op(master, g_volatile_ctrl));
1980 master->is_auto = true;
1981 master->has_volatiles = set_volatile;
1982 master->manual_mode_value = manual_val;
1983 master->flags |= V4L2_CTRL_FLAG_UPDATE;
1984
1985 if (!is_cur_manual(master))
1986 flag = V4L2_CTRL_FLAG_INACTIVE |
1987 (set_volatile ? V4L2_CTRL_FLAG_VOLATILE : 0);
1988
1989 for (i = 1; i < ncontrols; i++)
1990 if (controls[i])
1991 controls[i]->flags |= flag;
1992 }
1993 EXPORT_SYMBOL(v4l2_ctrl_auto_cluster);
1994
1995 /* Activate/deactivate a control. */
1996 void v4l2_ctrl_activate(struct v4l2_ctrl *ctrl, bool active)
1997 {
1998 /* invert since the actual flag is called 'inactive' */
1999 bool inactive = !active;
2000 bool old;
2001
2002 if (ctrl == NULL)
2003 return;
2004
2005 if (inactive)
2006 /* set V4L2_CTRL_FLAG_INACTIVE */
2007 old = test_and_set_bit(4, &ctrl->flags);
2008 else
2009 /* clear V4L2_CTRL_FLAG_INACTIVE */
2010 old = test_and_clear_bit(4, &ctrl->flags);
2011 if (old != inactive)
2012 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_FLAGS);
2013 }
2014 EXPORT_SYMBOL(v4l2_ctrl_activate);
2015
2016 /* Grab/ungrab a control.
2017 Typically used when streaming starts and you want to grab controls,
2018 preventing the user from changing them.
2019
2020 Just call this and the framework will block any attempts to change
2021 these controls. */
2022 void v4l2_ctrl_grab(struct v4l2_ctrl *ctrl, bool grabbed)
2023 {
2024 bool old;
2025
2026 if (ctrl == NULL)
2027 return;
2028
2029 v4l2_ctrl_lock(ctrl);
2030 if (grabbed)
2031 /* set V4L2_CTRL_FLAG_GRABBED */
2032 old = test_and_set_bit(1, &ctrl->flags);
2033 else
2034 /* clear V4L2_CTRL_FLAG_GRABBED */
2035 old = test_and_clear_bit(1, &ctrl->flags);
2036 if (old != grabbed)
2037 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_FLAGS);
2038 v4l2_ctrl_unlock(ctrl);
2039 }
2040 EXPORT_SYMBOL(v4l2_ctrl_grab);
2041
2042 /* Log the control name and value */
2043 static void log_ctrl(const struct v4l2_ctrl *ctrl,
2044 const char *prefix, const char *colon)
2045 {
2046 if (ctrl->flags & (V4L2_CTRL_FLAG_DISABLED | V4L2_CTRL_FLAG_WRITE_ONLY))
2047 return;
2048 if (ctrl->type == V4L2_CTRL_TYPE_CTRL_CLASS)
2049 return;
2050
2051 printk(KERN_INFO "%s%s%s: ", prefix, colon, ctrl->name);
2052
2053 switch (ctrl->type) {
2054 case V4L2_CTRL_TYPE_INTEGER:
2055 printk(KERN_CONT "%d", ctrl->cur.val);
2056 break;
2057 case V4L2_CTRL_TYPE_BOOLEAN:
2058 printk(KERN_CONT "%s", ctrl->cur.val ? "true" : "false");
2059 break;
2060 case V4L2_CTRL_TYPE_MENU:
2061 printk(KERN_CONT "%s", ctrl->qmenu[ctrl->cur.val]);
2062 break;
2063 case V4L2_CTRL_TYPE_INTEGER_MENU:
2064 printk(KERN_CONT "%lld", ctrl->qmenu_int[ctrl->cur.val]);
2065 break;
2066 case V4L2_CTRL_TYPE_BITMASK:
2067 printk(KERN_CONT "0x%08x", ctrl->cur.val);
2068 break;
2069 case V4L2_CTRL_TYPE_INTEGER64:
2070 printk(KERN_CONT "%lld", ctrl->cur.val64);
2071 break;
2072 case V4L2_CTRL_TYPE_STRING:
2073 printk(KERN_CONT "%s", ctrl->cur.string);
2074 break;
2075 default:
2076 printk(KERN_CONT "unknown type %d", ctrl->type);
2077 break;
2078 }
2079 if (ctrl->flags & (V4L2_CTRL_FLAG_INACTIVE |
2080 V4L2_CTRL_FLAG_GRABBED |
2081 V4L2_CTRL_FLAG_VOLATILE)) {
2082 if (ctrl->flags & V4L2_CTRL_FLAG_INACTIVE)
2083 printk(KERN_CONT " inactive");
2084 if (ctrl->flags & V4L2_CTRL_FLAG_GRABBED)
2085 printk(KERN_CONT " grabbed");
2086 if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE)
2087 printk(KERN_CONT " volatile");
2088 }
2089 printk(KERN_CONT "\n");
2090 }
2091
2092 /* Log all controls owned by the handler */
2093 void v4l2_ctrl_handler_log_status(struct v4l2_ctrl_handler *hdl,
2094 const char *prefix)
2095 {
2096 struct v4l2_ctrl *ctrl;
2097 const char *colon = "";
2098 int len;
2099
2100 if (hdl == NULL)
2101 return;
2102 if (prefix == NULL)
2103 prefix = "";
2104 len = strlen(prefix);
2105 if (len && prefix[len - 1] != ' ')
2106 colon = ": ";
2107 mutex_lock(hdl->lock);
2108 list_for_each_entry(ctrl, &hdl->ctrls, node)
2109 if (!(ctrl->flags & V4L2_CTRL_FLAG_DISABLED))
2110 log_ctrl(ctrl, prefix, colon);
2111 mutex_unlock(hdl->lock);
2112 }
2113 EXPORT_SYMBOL(v4l2_ctrl_handler_log_status);
2114
2115 int v4l2_ctrl_subdev_log_status(struct v4l2_subdev *sd)
2116 {
2117 v4l2_ctrl_handler_log_status(sd->ctrl_handler, sd->name);
2118 return 0;
2119 }
2120 EXPORT_SYMBOL(v4l2_ctrl_subdev_log_status);
2121
2122 /* Call s_ctrl for all controls owned by the handler */
2123 int v4l2_ctrl_handler_setup(struct v4l2_ctrl_handler *hdl)
2124 {
2125 struct v4l2_ctrl *ctrl;
2126 int ret = 0;
2127
2128 if (hdl == NULL)
2129 return 0;
2130 mutex_lock(hdl->lock);
2131 list_for_each_entry(ctrl, &hdl->ctrls, node)
2132 ctrl->done = false;
2133
2134 list_for_each_entry(ctrl, &hdl->ctrls, node) {
2135 struct v4l2_ctrl *master = ctrl->cluster[0];
2136 int i;
2137
2138 /* Skip if this control was already handled by a cluster. */
2139 /* Skip button controls and read-only controls. */
2140 if (ctrl->done || ctrl->type == V4L2_CTRL_TYPE_BUTTON ||
2141 (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY))
2142 continue;
2143
2144 for (i = 0; i < master->ncontrols; i++) {
2145 if (master->cluster[i]) {
2146 cur_to_new(master->cluster[i]);
2147 master->cluster[i]->is_new = 1;
2148 master->cluster[i]->done = true;
2149 }
2150 }
2151 ret = call_op(master, s_ctrl);
2152 if (ret)
2153 break;
2154 }
2155 mutex_unlock(hdl->lock);
2156 return ret;
2157 }
2158 EXPORT_SYMBOL(v4l2_ctrl_handler_setup);
2159
2160 /* Implement VIDIOC_QUERYCTRL */
2161 int v4l2_queryctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_queryctrl *qc)
2162 {
2163 u32 id = qc->id & V4L2_CTRL_ID_MASK;
2164 struct v4l2_ctrl_ref *ref;
2165 struct v4l2_ctrl *ctrl;
2166
2167 if (hdl == NULL)
2168 return -EINVAL;
2169
2170 mutex_lock(hdl->lock);
2171
2172 /* Try to find it */
2173 ref = find_ref(hdl, id);
2174
2175 if ((qc->id & V4L2_CTRL_FLAG_NEXT_CTRL) && !list_empty(&hdl->ctrl_refs)) {
2176 /* Find the next control with ID > qc->id */
2177
2178 /* Did we reach the end of the control list? */
2179 if (id >= node2id(hdl->ctrl_refs.prev)) {
2180 ref = NULL; /* Yes, so there is no next control */
2181 } else if (ref) {
2182 /* We found a control with the given ID, so just get
2183 the next one in the list. */
2184 ref = list_entry(ref->node.next, typeof(*ref), node);
2185 } else {
2186 /* No control with the given ID exists, so start
2187 searching for the next largest ID. We know there
2188 is one, otherwise the first 'if' above would have
2189 been true. */
2190 list_for_each_entry(ref, &hdl->ctrl_refs, node)
2191 if (id < ref->ctrl->id)
2192 break;
2193 }
2194 }
2195 mutex_unlock(hdl->lock);
2196 if (!ref)
2197 return -EINVAL;
2198
2199 ctrl = ref->ctrl;
2200 memset(qc, 0, sizeof(*qc));
2201 if (id >= V4L2_CID_PRIVATE_BASE)
2202 qc->id = id;
2203 else
2204 qc->id = ctrl->id;
2205 strlcpy(qc->name, ctrl->name, sizeof(qc->name));
2206 qc->minimum = ctrl->minimum;
2207 qc->maximum = ctrl->maximum;
2208 qc->default_value = ctrl->default_value;
2209 if (ctrl->type == V4L2_CTRL_TYPE_MENU
2210 || ctrl->type == V4L2_CTRL_TYPE_INTEGER_MENU)
2211 qc->step = 1;
2212 else
2213 qc->step = ctrl->step;
2214 qc->flags = ctrl->flags;
2215 qc->type = ctrl->type;
2216 return 0;
2217 }
2218 EXPORT_SYMBOL(v4l2_queryctrl);
2219
2220 int v4l2_subdev_queryctrl(struct v4l2_subdev *sd, struct v4l2_queryctrl *qc)
2221 {
2222 if (qc->id & V4L2_CTRL_FLAG_NEXT_CTRL)
2223 return -EINVAL;
2224 return v4l2_queryctrl(sd->ctrl_handler, qc);
2225 }
2226 EXPORT_SYMBOL(v4l2_subdev_queryctrl);
2227
2228 /* Implement VIDIOC_QUERYMENU */
2229 int v4l2_querymenu(struct v4l2_ctrl_handler *hdl, struct v4l2_querymenu *qm)
2230 {
2231 struct v4l2_ctrl *ctrl;
2232 u32 i = qm->index;
2233
2234 ctrl = v4l2_ctrl_find(hdl, qm->id);
2235 if (!ctrl)
2236 return -EINVAL;
2237
2238 qm->reserved = 0;
2239 /* Sanity checks */
2240 switch (ctrl->type) {
2241 case V4L2_CTRL_TYPE_MENU:
2242 if (ctrl->qmenu == NULL)
2243 return -EINVAL;
2244 break;
2245 case V4L2_CTRL_TYPE_INTEGER_MENU:
2246 if (ctrl->qmenu_int == NULL)
2247 return -EINVAL;
2248 break;
2249 default:
2250 return -EINVAL;
2251 }
2252
2253 if (i < ctrl->minimum || i > ctrl->maximum)
2254 return -EINVAL;
2255
2256 /* Use mask to see if this menu item should be skipped */
2257 if (ctrl->menu_skip_mask & (1 << i))
2258 return -EINVAL;
2259 /* Empty menu items should also be skipped */
2260 if (ctrl->type == V4L2_CTRL_TYPE_MENU) {
2261 if (ctrl->qmenu[i] == NULL || ctrl->qmenu[i][0] == '\0')
2262 return -EINVAL;
2263 strlcpy(qm->name, ctrl->qmenu[i], sizeof(qm->name));
2264 } else {
2265 qm->value = ctrl->qmenu_int[i];
2266 }
2267 return 0;
2268 }
2269 EXPORT_SYMBOL(v4l2_querymenu);
2270
2271 int v4l2_subdev_querymenu(struct v4l2_subdev *sd, struct v4l2_querymenu *qm)
2272 {
2273 return v4l2_querymenu(sd->ctrl_handler, qm);
2274 }
2275 EXPORT_SYMBOL(v4l2_subdev_querymenu);
2276
2277
2278
2279 /* Some general notes on the atomic requirements of VIDIOC_G/TRY/S_EXT_CTRLS:
2280
2281 It is not a fully atomic operation, just best-effort only. After all, if
2282 multiple controls have to be set through multiple i2c writes (for example)
2283 then some initial writes may succeed while others fail. Thus leaving the
2284 system in an inconsistent state. The question is how much effort you are
2285 willing to spend on trying to make something atomic that really isn't.
2286
2287 From the point of view of an application the main requirement is that
2288 when you call VIDIOC_S_EXT_CTRLS and some values are invalid then an
2289 error should be returned without actually affecting any controls.
2290
2291 If all the values are correct, then it is acceptable to just give up
2292 in case of low-level errors.
2293
2294 It is important though that the application can tell when only a partial
2295 configuration was done. The way we do that is through the error_idx field
2296 of struct v4l2_ext_controls: if that is equal to the count field then no
2297 controls were affected. Otherwise all controls before that index were
2298 successful in performing their 'get' or 'set' operation, the control at
2299 the given index failed, and you don't know what happened with the controls
2300 after the failed one. Since if they were part of a control cluster they
2301 could have been successfully processed (if a cluster member was encountered
2302 at index < error_idx), they could have failed (if a cluster member was at
2303 error_idx), or they may not have been processed yet (if the first cluster
2304 member appeared after error_idx).
2305
2306 It is all fairly theoretical, though. In practice all you can do is to
2307 bail out. If error_idx == count, then it is an application bug. If
2308 error_idx < count then it is only an application bug if the error code was
2309 EBUSY. That usually means that something started streaming just when you
2310 tried to set the controls. In all other cases it is a driver/hardware
2311 problem and all you can do is to retry or bail out.
2312
2313 Note that these rules do not apply to VIDIOC_TRY_EXT_CTRLS: since that
2314 never modifies controls the error_idx is just set to whatever control
2315 has an invalid value.
2316 */
2317
2318 /* Prepare for the extended g/s/try functions.
2319 Find the controls in the control array and do some basic checks. */
2320 static int prepare_ext_ctrls(struct v4l2_ctrl_handler *hdl,
2321 struct v4l2_ext_controls *cs,
2322 struct v4l2_ctrl_helper *helpers)
2323 {
2324 struct v4l2_ctrl_helper *h;
2325 bool have_clusters = false;
2326 u32 i;
2327
2328 for (i = 0, h = helpers; i < cs->count; i++, h++) {
2329 struct v4l2_ext_control *c = &cs->controls[i];
2330 struct v4l2_ctrl_ref *ref;
2331 struct v4l2_ctrl *ctrl;
2332 u32 id = c->id & V4L2_CTRL_ID_MASK;
2333
2334 cs->error_idx = i;
2335
2336 if (cs->ctrl_class && V4L2_CTRL_ID2CLASS(id) != cs->ctrl_class)
2337 return -EINVAL;
2338
2339 /* Old-style private controls are not allowed for
2340 extended controls */
2341 if (id >= V4L2_CID_PRIVATE_BASE)
2342 return -EINVAL;
2343 ref = find_ref_lock(hdl, id);
2344 if (ref == NULL)
2345 return -EINVAL;
2346 ctrl = ref->ctrl;
2347 if (ctrl->flags & V4L2_CTRL_FLAG_DISABLED)
2348 return -EINVAL;
2349
2350 if (ctrl->cluster[0]->ncontrols > 1)
2351 have_clusters = true;
2352 if (ctrl->cluster[0] != ctrl)
2353 ref = find_ref_lock(hdl, ctrl->cluster[0]->id);
2354 /* Store the ref to the master control of the cluster */
2355 h->mref = ref;
2356 h->ctrl = ctrl;
2357 /* Initially set next to 0, meaning that there is no other
2358 control in this helper array belonging to the same
2359 cluster */
2360 h->next = 0;
2361 }
2362
2363 /* We are done if there were no controls that belong to a multi-
2364 control cluster. */
2365 if (!have_clusters)
2366 return 0;
2367
2368 /* The code below figures out in O(n) time which controls in the list
2369 belong to the same cluster. */
2370
2371 /* This has to be done with the handler lock taken. */
2372 mutex_lock(hdl->lock);
2373
2374 /* First zero the helper field in the master control references */
2375 for (i = 0; i < cs->count; i++)
2376 helpers[i].mref->helper = NULL;
2377 for (i = 0, h = helpers; i < cs->count; i++, h++) {
2378 struct v4l2_ctrl_ref *mref = h->mref;
2379
2380 /* If the mref->helper is set, then it points to an earlier
2381 helper that belongs to the same cluster. */
2382 if (mref->helper) {
2383 /* Set the next field of mref->helper to the current
2384 index: this means that that earlier helper now
2385 points to the next helper in the same cluster. */
2386 mref->helper->next = i;
2387 /* mref should be set only for the first helper in the
2388 cluster, clear the others. */
2389 h->mref = NULL;
2390 }
2391 /* Point the mref helper to the current helper struct. */
2392 mref->helper = h;
2393 }
2394 mutex_unlock(hdl->lock);
2395 return 0;
2396 }
2397
2398 /* Handles the corner case where cs->count == 0. It checks whether the
2399 specified control class exists. If that class ID is 0, then it checks
2400 whether there are any controls at all. */
2401 static int class_check(struct v4l2_ctrl_handler *hdl, u32 ctrl_class)
2402 {
2403 if (ctrl_class == 0)
2404 return list_empty(&hdl->ctrl_refs) ? -EINVAL : 0;
2405 return find_ref_lock(hdl, ctrl_class | 1) ? 0 : -EINVAL;
2406 }
2407
2408
2409
2410 /* Get extended controls. Allocates the helpers array if needed. */
2411 int v4l2_g_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *cs)
2412 {
2413 struct v4l2_ctrl_helper helper[4];
2414 struct v4l2_ctrl_helper *helpers = helper;
2415 int ret;
2416 int i, j;
2417
2418 cs->error_idx = cs->count;
2419 cs->ctrl_class = V4L2_CTRL_ID2CLASS(cs->ctrl_class);
2420
2421 if (hdl == NULL)
2422 return -EINVAL;
2423
2424 if (cs->count == 0)
2425 return class_check(hdl, cs->ctrl_class);
2426
2427 if (cs->count > ARRAY_SIZE(helper)) {
2428 helpers = kmalloc_array(cs->count, sizeof(helper[0]),
2429 GFP_KERNEL);
2430 if (helpers == NULL)
2431 return -ENOMEM;
2432 }
2433
2434 ret = prepare_ext_ctrls(hdl, cs, helpers);
2435 cs->error_idx = cs->count;
2436
2437 for (i = 0; !ret && i < cs->count; i++)
2438 if (helpers[i].ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY)
2439 ret = -EACCES;
2440
2441 for (i = 0; !ret && i < cs->count; i++) {
2442 int (*ctrl_to_user)(struct v4l2_ext_control *c,
2443 struct v4l2_ctrl *ctrl) = cur_to_user;
2444 struct v4l2_ctrl *master;
2445
2446 if (helpers[i].mref == NULL)
2447 continue;
2448
2449 master = helpers[i].mref->ctrl;
2450 cs->error_idx = i;
2451
2452 v4l2_ctrl_lock(master);
2453
2454 /* g_volatile_ctrl will update the new control values */
2455 if ((master->flags & V4L2_CTRL_FLAG_VOLATILE) ||
2456 (master->has_volatiles && !is_cur_manual(master))) {
2457 for (j = 0; j < master->ncontrols; j++)
2458 cur_to_new(master->cluster[j]);
2459 ret = call_op(master, g_volatile_ctrl);
2460 ctrl_to_user = new_to_user;
2461 }
2462 /* If OK, then copy the current (for non-volatile controls)
2463 or the new (for volatile controls) control values to the
2464 caller */
2465 if (!ret) {
2466 u32 idx = i;
2467
2468 do {
2469 ret = ctrl_to_user(cs->controls + idx,
2470 helpers[idx].ctrl);
2471 idx = helpers[idx].next;
2472 } while (!ret && idx);
2473 }
2474 v4l2_ctrl_unlock(master);
2475 }
2476
2477 if (cs->count > ARRAY_SIZE(helper))
2478 kfree(helpers);
2479 return ret;
2480 }
2481 EXPORT_SYMBOL(v4l2_g_ext_ctrls);
2482
2483 int v4l2_subdev_g_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs)
2484 {
2485 return v4l2_g_ext_ctrls(sd->ctrl_handler, cs);
2486 }
2487 EXPORT_SYMBOL(v4l2_subdev_g_ext_ctrls);
2488
2489 /* Helper function to get a single control */
2490 static int get_ctrl(struct v4l2_ctrl *ctrl, struct v4l2_ext_control *c)
2491 {
2492 struct v4l2_ctrl *master = ctrl->cluster[0];
2493 int ret = 0;
2494 int i;
2495
2496 /* String controls are not supported. The new_to_user() and
2497 * cur_to_user() calls below would need to be modified not to access
2498 * userspace memory when called from get_ctrl().
2499 */
2500 if (ctrl->type == V4L2_CTRL_TYPE_STRING)
2501 return -EINVAL;
2502
2503 if (ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY)
2504 return -EACCES;
2505
2506 v4l2_ctrl_lock(master);
2507 /* g_volatile_ctrl will update the current control values */
2508 if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE) {
2509 for (i = 0; i < master->ncontrols; i++)
2510 cur_to_new(master->cluster[i]);
2511 ret = call_op(master, g_volatile_ctrl);
2512 new_to_user(c, ctrl);
2513 } else {
2514 cur_to_user(c, ctrl);
2515 }
2516 v4l2_ctrl_unlock(master);
2517 return ret;
2518 }
2519
2520 int v4l2_g_ctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_control *control)
2521 {
2522 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, control->id);
2523 struct v4l2_ext_control c;
2524 int ret;
2525
2526 if (ctrl == NULL || !type_is_int(ctrl))
2527 return -EINVAL;
2528 ret = get_ctrl(ctrl, &c);
2529 control->value = c.value;
2530 return ret;
2531 }
2532 EXPORT_SYMBOL(v4l2_g_ctrl);
2533
2534 int v4l2_subdev_g_ctrl(struct v4l2_subdev *sd, struct v4l2_control *control)
2535 {
2536 return v4l2_g_ctrl(sd->ctrl_handler, control);
2537 }
2538 EXPORT_SYMBOL(v4l2_subdev_g_ctrl);
2539
2540 s32 v4l2_ctrl_g_ctrl(struct v4l2_ctrl *ctrl)
2541 {
2542 struct v4l2_ext_control c;
2543
2544 /* It's a driver bug if this happens. */
2545 WARN_ON(!type_is_int(ctrl));
2546 c.value = 0;
2547 get_ctrl(ctrl, &c);
2548 return c.value;
2549 }
2550 EXPORT_SYMBOL(v4l2_ctrl_g_ctrl);
2551
2552 s64 v4l2_ctrl_g_ctrl_int64(struct v4l2_ctrl *ctrl)
2553 {
2554 struct v4l2_ext_control c;
2555
2556 /* It's a driver bug if this happens. */
2557 WARN_ON(ctrl->type != V4L2_CTRL_TYPE_INTEGER64);
2558 c.value = 0;
2559 get_ctrl(ctrl, &c);
2560 return c.value;
2561 }
2562 EXPORT_SYMBOL(v4l2_ctrl_g_ctrl_int64);
2563
2564
2565 /* Core function that calls try/s_ctrl and ensures that the new value is
2566 copied to the current value on a set.
2567 Must be called with ctrl->handler->lock held. */
2568 static int try_or_set_cluster(struct v4l2_fh *fh, struct v4l2_ctrl *master,
2569 bool set, u32 ch_flags)
2570 {
2571 bool update_flag;
2572 int ret;
2573 int i;
2574
2575 /* Go through the cluster and either validate the new value or
2576 (if no new value was set), copy the current value to the new
2577 value, ensuring a consistent view for the control ops when
2578 called. */
2579 for (i = 0; i < master->ncontrols; i++) {
2580 struct v4l2_ctrl *ctrl = master->cluster[i];
2581
2582 if (ctrl == NULL)
2583 continue;
2584
2585 if (!ctrl->is_new) {
2586 cur_to_new(ctrl);
2587 continue;
2588 }
2589 /* Check again: it may have changed since the
2590 previous check in try_or_set_ext_ctrls(). */
2591 if (set && (ctrl->flags & V4L2_CTRL_FLAG_GRABBED))
2592 return -EBUSY;
2593 }
2594
2595 ret = call_op(master, try_ctrl);
2596
2597 /* Don't set if there is no change */
2598 if (ret || !set || !cluster_changed(master))
2599 return ret;
2600 ret = call_op(master, s_ctrl);
2601 if (ret)
2602 return ret;
2603
2604 /* If OK, then make the new values permanent. */
2605 update_flag = is_cur_manual(master) != is_new_manual(master);
2606 for (i = 0; i < master->ncontrols; i++)
2607 new_to_cur(fh, master->cluster[i], ch_flags |
2608 ((update_flag && i > 0) ? V4L2_EVENT_CTRL_CH_FLAGS : 0));
2609 return 0;
2610 }
2611
2612 /* Validate controls. */
2613 static int validate_ctrls(struct v4l2_ext_controls *cs,
2614 struct v4l2_ctrl_helper *helpers, bool set)
2615 {
2616 unsigned i;
2617 int ret = 0;
2618
2619 cs->error_idx = cs->count;
2620 for (i = 0; i < cs->count; i++) {
2621 struct v4l2_ctrl *ctrl = helpers[i].ctrl;
2622
2623 cs->error_idx = i;
2624
2625 if (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY)
2626 return -EACCES;
2627 /* This test is also done in try_set_control_cluster() which
2628 is called in atomic context, so that has the final say,
2629 but it makes sense to do an up-front check as well. Once
2630 an error occurs in try_set_control_cluster() some other
2631 controls may have been set already and we want to do a
2632 best-effort to avoid that. */
2633 if (set && (ctrl->flags & V4L2_CTRL_FLAG_GRABBED))
2634 return -EBUSY;
2635 ret = validate_new(ctrl, &cs->controls[i]);
2636 if (ret)
2637 return ret;
2638 }
2639 return 0;
2640 }
2641
2642 /* Obtain the current volatile values of an autocluster and mark them
2643 as new. */
2644 static void update_from_auto_cluster(struct v4l2_ctrl *master)
2645 {
2646 int i;
2647
2648 for (i = 0; i < master->ncontrols; i++)
2649 cur_to_new(master->cluster[i]);
2650 if (!call_op(master, g_volatile_ctrl))
2651 for (i = 1; i < master->ncontrols; i++)
2652 if (master->cluster[i])
2653 master->cluster[i]->is_new = 1;
2654 }
2655
2656 /* Try or try-and-set controls */
2657 static int try_set_ext_ctrls(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
2658 struct v4l2_ext_controls *cs,
2659 bool set)
2660 {
2661 struct v4l2_ctrl_helper helper[4];
2662 struct v4l2_ctrl_helper *helpers = helper;
2663 unsigned i, j;
2664 int ret;
2665
2666 cs->error_idx = cs->count;
2667 cs->ctrl_class = V4L2_CTRL_ID2CLASS(cs->ctrl_class);
2668
2669 if (hdl == NULL)
2670 return -EINVAL;
2671
2672 if (cs->count == 0)
2673 return class_check(hdl, cs->ctrl_class);
2674
2675 if (cs->count > ARRAY_SIZE(helper)) {
2676 helpers = kmalloc_array(cs->count, sizeof(helper[0]),
2677 GFP_KERNEL);
2678 if (!helpers)
2679 return -ENOMEM;
2680 }
2681 ret = prepare_ext_ctrls(hdl, cs, helpers);
2682 if (!ret)
2683 ret = validate_ctrls(cs, helpers, set);
2684 if (ret && set)
2685 cs->error_idx = cs->count;
2686 for (i = 0; !ret && i < cs->count; i++) {
2687 struct v4l2_ctrl *master;
2688 u32 idx = i;
2689
2690 if (helpers[i].mref == NULL)
2691 continue;
2692
2693 cs->error_idx = i;
2694 master = helpers[i].mref->ctrl;
2695 v4l2_ctrl_lock(master);
2696
2697 /* Reset the 'is_new' flags of the cluster */
2698 for (j = 0; j < master->ncontrols; j++)
2699 if (master->cluster[j])
2700 master->cluster[j]->is_new = 0;
2701
2702 /* For volatile autoclusters that are currently in auto mode
2703 we need to discover if it will be set to manual mode.
2704 If so, then we have to copy the current volatile values
2705 first since those will become the new manual values (which
2706 may be overwritten by explicit new values from this set
2707 of controls). */
2708 if (master->is_auto && master->has_volatiles &&
2709 !is_cur_manual(master)) {
2710 /* Pick an initial non-manual value */
2711 s32 new_auto_val = master->manual_mode_value + 1;
2712 u32 tmp_idx = idx;
2713
2714 do {
2715 /* Check if the auto control is part of the
2716 list, and remember the new value. */
2717 if (helpers[tmp_idx].ctrl == master)
2718 new_auto_val = cs->controls[tmp_idx].value;
2719 tmp_idx = helpers[tmp_idx].next;
2720 } while (tmp_idx);
2721 /* If the new value == the manual value, then copy
2722 the current volatile values. */
2723 if (new_auto_val == master->manual_mode_value)
2724 update_from_auto_cluster(master);
2725 }
2726
2727 /* Copy the new caller-supplied control values.
2728 user_to_new() sets 'is_new' to 1. */
2729 do {
2730 ret = user_to_new(cs->controls + idx, helpers[idx].ctrl);
2731 idx = helpers[idx].next;
2732 } while (!ret && idx);
2733
2734 if (!ret)
2735 ret = try_or_set_cluster(fh, master, set, 0);
2736
2737 /* Copy the new values back to userspace. */
2738 if (!ret) {
2739 idx = i;
2740 do {
2741 ret = new_to_user(cs->controls + idx,
2742 helpers[idx].ctrl);
2743 idx = helpers[idx].next;
2744 } while (!ret && idx);
2745 }
2746 v4l2_ctrl_unlock(master);
2747 }
2748
2749 if (cs->count > ARRAY_SIZE(helper))
2750 kfree(helpers);
2751 return ret;
2752 }
2753
2754 int v4l2_try_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *cs)
2755 {
2756 return try_set_ext_ctrls(NULL, hdl, cs, false);
2757 }
2758 EXPORT_SYMBOL(v4l2_try_ext_ctrls);
2759
2760 int v4l2_s_ext_ctrls(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
2761 struct v4l2_ext_controls *cs)
2762 {
2763 return try_set_ext_ctrls(fh, hdl, cs, true);
2764 }
2765 EXPORT_SYMBOL(v4l2_s_ext_ctrls);
2766
2767 int v4l2_subdev_try_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs)
2768 {
2769 return try_set_ext_ctrls(NULL, sd->ctrl_handler, cs, false);
2770 }
2771 EXPORT_SYMBOL(v4l2_subdev_try_ext_ctrls);
2772
2773 int v4l2_subdev_s_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs)
2774 {
2775 return try_set_ext_ctrls(NULL, sd->ctrl_handler, cs, true);
2776 }
2777 EXPORT_SYMBOL(v4l2_subdev_s_ext_ctrls);
2778
2779 /* Helper function for VIDIOC_S_CTRL compatibility */
2780 static int set_ctrl(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl,
2781 struct v4l2_ext_control *c, u32 ch_flags)
2782 {
2783 struct v4l2_ctrl *master = ctrl->cluster[0];
2784 int i;
2785
2786 /* String controls are not supported. The user_to_new() and
2787 * cur_to_user() calls below would need to be modified not to access
2788 * userspace memory when called from set_ctrl().
2789 */
2790 if (ctrl->type == V4L2_CTRL_TYPE_STRING)
2791 return -EINVAL;
2792
2793 /* Reset the 'is_new' flags of the cluster */
2794 for (i = 0; i < master->ncontrols; i++)
2795 if (master->cluster[i])
2796 master->cluster[i]->is_new = 0;
2797
2798 /* For autoclusters with volatiles that are switched from auto to
2799 manual mode we have to update the current volatile values since
2800 those will become the initial manual values after such a switch. */
2801 if (master->is_auto && master->has_volatiles && ctrl == master &&
2802 !is_cur_manual(master) && c->value == master->manual_mode_value)
2803 update_from_auto_cluster(master);
2804
2805 user_to_new(c, ctrl);
2806 return try_or_set_cluster(fh, master, true, ch_flags);
2807 }
2808
2809 /* Helper function for VIDIOC_S_CTRL compatibility */
2810 static int set_ctrl_lock(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl,
2811 struct v4l2_ext_control *c)
2812 {
2813 int ret = validate_new(ctrl, c);
2814
2815 if (!ret) {
2816 v4l2_ctrl_lock(ctrl);
2817 ret = set_ctrl(fh, ctrl, c, 0);
2818 if (!ret)
2819 cur_to_user(c, ctrl);
2820 v4l2_ctrl_unlock(ctrl);
2821 }
2822 return ret;
2823 }
2824
2825 int v4l2_s_ctrl(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
2826 struct v4l2_control *control)
2827 {
2828 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, control->id);
2829 struct v4l2_ext_control c;
2830 int ret;
2831
2832 if (ctrl == NULL || !type_is_int(ctrl))
2833 return -EINVAL;
2834
2835 if (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY)
2836 return -EACCES;
2837
2838 c.value = control->value;
2839 ret = set_ctrl_lock(fh, ctrl, &c);
2840 control->value = c.value;
2841 return ret;
2842 }
2843 EXPORT_SYMBOL(v4l2_s_ctrl);
2844
2845 int v4l2_subdev_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *control)
2846 {
2847 return v4l2_s_ctrl(NULL, sd->ctrl_handler, control);
2848 }
2849 EXPORT_SYMBOL(v4l2_subdev_s_ctrl);
2850
2851 int v4l2_ctrl_s_ctrl(struct v4l2_ctrl *ctrl, s32 val)
2852 {
2853 struct v4l2_ext_control c;
2854
2855 /* It's a driver bug if this happens. */
2856 WARN_ON(!type_is_int(ctrl));
2857 c.value = val;
2858 return set_ctrl_lock(NULL, ctrl, &c);
2859 }
2860 EXPORT_SYMBOL(v4l2_ctrl_s_ctrl);
2861
2862 int v4l2_ctrl_s_ctrl_int64(struct v4l2_ctrl *ctrl, s64 val)
2863 {
2864 struct v4l2_ext_control c;
2865
2866 /* It's a driver bug if this happens. */
2867 WARN_ON(ctrl->type != V4L2_CTRL_TYPE_INTEGER64);
2868 c.value64 = val;
2869 return set_ctrl_lock(NULL, ctrl, &c);
2870 }
2871 EXPORT_SYMBOL(v4l2_ctrl_s_ctrl_int64);
2872
2873 void v4l2_ctrl_notify(struct v4l2_ctrl *ctrl, v4l2_ctrl_notify_fnc notify, void *priv)
2874 {
2875 if (ctrl == NULL)
2876 return;
2877 if (notify == NULL) {
2878 ctrl->call_notify = 0;
2879 return;
2880 }
2881 if (WARN_ON(ctrl->handler->notify && ctrl->handler->notify != notify))
2882 return;
2883 ctrl->handler->notify = notify;
2884 ctrl->handler->notify_priv = priv;
2885 ctrl->call_notify = 1;
2886 }
2887 EXPORT_SYMBOL(v4l2_ctrl_notify);
2888
2889 int v4l2_ctrl_modify_range(struct v4l2_ctrl *ctrl,
2890 s32 min, s32 max, u32 step, s32 def)
2891 {
2892 int ret = check_range(ctrl->type, min, max, step, def);
2893 struct v4l2_ext_control c;
2894
2895 switch (ctrl->type) {
2896 case V4L2_CTRL_TYPE_INTEGER:
2897 case V4L2_CTRL_TYPE_BOOLEAN:
2898 case V4L2_CTRL_TYPE_MENU:
2899 case V4L2_CTRL_TYPE_INTEGER_MENU:
2900 case V4L2_CTRL_TYPE_BITMASK:
2901 if (ret)
2902 return ret;
2903 break;
2904 default:
2905 return -EINVAL;
2906 }
2907 v4l2_ctrl_lock(ctrl);
2908 ctrl->minimum = min;
2909 ctrl->maximum = max;
2910 ctrl->step = step;
2911 ctrl->default_value = def;
2912 c.value = ctrl->cur.val;
2913 if (validate_new(ctrl, &c))
2914 c.value = def;
2915 if (c.value != ctrl->cur.val)
2916 ret = set_ctrl(NULL, ctrl, &c, V4L2_EVENT_CTRL_CH_RANGE);
2917 else
2918 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_RANGE);
2919 v4l2_ctrl_unlock(ctrl);
2920 return ret;
2921 }
2922 EXPORT_SYMBOL(v4l2_ctrl_modify_range);
2923
2924 static int v4l2_ctrl_add_event(struct v4l2_subscribed_event *sev, unsigned elems)
2925 {
2926 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(sev->fh->ctrl_handler, sev->id);
2927
2928 if (ctrl == NULL)
2929 return -EINVAL;
2930
2931 v4l2_ctrl_lock(ctrl);
2932 list_add_tail(&sev->node, &ctrl->ev_subs);
2933 if (ctrl->type != V4L2_CTRL_TYPE_CTRL_CLASS &&
2934 (sev->flags & V4L2_EVENT_SUB_FL_SEND_INITIAL)) {
2935 struct v4l2_event ev;
2936 u32 changes = V4L2_EVENT_CTRL_CH_FLAGS;
2937
2938 if (!(ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY))
2939 changes |= V4L2_EVENT_CTRL_CH_VALUE;
2940 fill_event(&ev, ctrl, changes);
2941 /* Mark the queue as active, allowing this initial
2942 event to be accepted. */
2943 sev->elems = elems;
2944 v4l2_event_queue_fh(sev->fh, &ev);
2945 }
2946 v4l2_ctrl_unlock(ctrl);
2947 return 0;
2948 }
2949
2950 static void v4l2_ctrl_del_event(struct v4l2_subscribed_event *sev)
2951 {
2952 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(sev->fh->ctrl_handler, sev->id);
2953
2954 v4l2_ctrl_lock(ctrl);
2955 list_del(&sev->node);
2956 v4l2_ctrl_unlock(ctrl);
2957 }
2958
2959 void v4l2_ctrl_replace(struct v4l2_event *old, const struct v4l2_event *new)
2960 {
2961 u32 old_changes = old->u.ctrl.changes;
2962
2963 old->u.ctrl = new->u.ctrl;
2964 old->u.ctrl.changes |= old_changes;
2965 }
2966 EXPORT_SYMBOL(v4l2_ctrl_replace);
2967
2968 void v4l2_ctrl_merge(const struct v4l2_event *old, struct v4l2_event *new)
2969 {
2970 new->u.ctrl.changes |= old->u.ctrl.changes;
2971 }
2972 EXPORT_SYMBOL(v4l2_ctrl_merge);
2973
2974 const struct v4l2_subscribed_event_ops v4l2_ctrl_sub_ev_ops = {
2975 .add = v4l2_ctrl_add_event,
2976 .del = v4l2_ctrl_del_event,
2977 .replace = v4l2_ctrl_replace,
2978 .merge = v4l2_ctrl_merge,
2979 };
2980 EXPORT_SYMBOL(v4l2_ctrl_sub_ev_ops);
2981
2982 int v4l2_ctrl_log_status(struct file *file, void *fh)
2983 {
2984 struct video_device *vfd = video_devdata(file);
2985 struct v4l2_fh *vfh = file->private_data;
2986
2987 if (test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags) && vfd->v4l2_dev)
2988 v4l2_ctrl_handler_log_status(vfh->ctrl_handler,
2989 vfd->v4l2_dev->name);
2990 return 0;
2991 }
2992 EXPORT_SYMBOL(v4l2_ctrl_log_status);
2993
2994 int v4l2_ctrl_subscribe_event(struct v4l2_fh *fh,
2995 const struct v4l2_event_subscription *sub)
2996 {
2997 if (sub->type == V4L2_EVENT_CTRL)
2998 return v4l2_event_subscribe(fh, sub, 0, &v4l2_ctrl_sub_ev_ops);
2999 return -EINVAL;
3000 }
3001 EXPORT_SYMBOL(v4l2_ctrl_subscribe_event);
3002
3003 int v4l2_ctrl_subdev_subscribe_event(struct v4l2_subdev *sd, struct v4l2_fh *fh,
3004 struct v4l2_event_subscription *sub)
3005 {
3006 if (!sd->ctrl_handler)
3007 return -EINVAL;
3008 return v4l2_ctrl_subscribe_event(fh, sub);
3009 }
3010 EXPORT_SYMBOL(v4l2_ctrl_subdev_subscribe_event);
3011
3012 unsigned int v4l2_ctrl_poll(struct file *file, struct poll_table_struct *wait)
3013 {
3014 struct v4l2_fh *fh = file->private_data;
3015
3016 if (v4l2_event_pending(fh))
3017 return POLLPRI;
3018 poll_wait(file, &fh->wait, wait);
3019 return 0;
3020 }
3021 EXPORT_SYMBOL(v4l2_ctrl_poll);
Linux kernel - Deliverables
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