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mfd: wm8350-i2c: Make sure the i2c regmap functions are compiled
[linux/fpc-iii.git] / drivers / media / v4l2-core / v4l2-ctrls.c
blobc3f0803886843d3b3c0ac8abd8474cf23dddd301
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 Efficency",
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 const *v4l2_ctrl_get_int_menu(u32 id, u32 *len)
569 {
570 static const s64 const qmenu_int_vpx_num_partitions[] = {
571 1, 2, 4, 8,
572 };
573
574 static const s64 const 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_REPEAT_SEQ_HEADER: return "Repeat Sequence Header";
739
740 /* VPX controls */
741 case V4L2_CID_MPEG_VIDEO_VPX_NUM_PARTITIONS: return "VPX Number of Partitions";
742 case V4L2_CID_MPEG_VIDEO_VPX_IMD_DISABLE_4X4: return "VPX Intra Mode Decision Disable";
743 case V4L2_CID_MPEG_VIDEO_VPX_NUM_REF_FRAMES: return "VPX No. of Refs for P Frame";
744 case V4L2_CID_MPEG_VIDEO_VPX_FILTER_LEVEL: return "VPX Loop Filter Level Range";
745 case V4L2_CID_MPEG_VIDEO_VPX_FILTER_SHARPNESS: return "VPX Deblocking Effect Control";
746 case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_REF_PERIOD: return "VPX Golden Frame Refresh Period";
747 case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_SEL: return "VPX Golden Frame Indicator";
748
749 /* CAMERA controls */
750 /* Keep the order of the 'case's the same as in videodev2.h! */
751 case V4L2_CID_CAMERA_CLASS: return "Camera Controls";
752 case V4L2_CID_EXPOSURE_AUTO: return "Auto Exposure";
753 case V4L2_CID_EXPOSURE_ABSOLUTE: return "Exposure Time, Absolute";
754 case V4L2_CID_EXPOSURE_AUTO_PRIORITY: return "Exposure, Dynamic Framerate";
755 case V4L2_CID_PAN_RELATIVE: return "Pan, Relative";
756 case V4L2_CID_TILT_RELATIVE: return "Tilt, Relative";
757 case V4L2_CID_PAN_RESET: return "Pan, Reset";
758 case V4L2_CID_TILT_RESET: return "Tilt, Reset";
759 case V4L2_CID_PAN_ABSOLUTE: return "Pan, Absolute";
760 case V4L2_CID_TILT_ABSOLUTE: return "Tilt, Absolute";
761 case V4L2_CID_FOCUS_ABSOLUTE: return "Focus, Absolute";
762 case V4L2_CID_FOCUS_RELATIVE: return "Focus, Relative";
763 case V4L2_CID_FOCUS_AUTO: return "Focus, Automatic Continuous";
764 case V4L2_CID_ZOOM_ABSOLUTE: return "Zoom, Absolute";
765 case V4L2_CID_ZOOM_RELATIVE: return "Zoom, Relative";
766 case V4L2_CID_ZOOM_CONTINUOUS: return "Zoom, Continuous";
767 case V4L2_CID_PRIVACY: return "Privacy";
768 case V4L2_CID_IRIS_ABSOLUTE: return "Iris, Absolute";
769 case V4L2_CID_IRIS_RELATIVE: return "Iris, Relative";
770 case V4L2_CID_AUTO_EXPOSURE_BIAS: return "Auto Exposure, Bias";
771 case V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE: return "White Balance, Auto & Preset";
772 case V4L2_CID_WIDE_DYNAMIC_RANGE: return "Wide Dynamic Range";
773 case V4L2_CID_IMAGE_STABILIZATION: return "Image Stabilization";
774 case V4L2_CID_ISO_SENSITIVITY: return "ISO Sensitivity";
775 case V4L2_CID_ISO_SENSITIVITY_AUTO: return "ISO Sensitivity, Auto";
776 case V4L2_CID_EXPOSURE_METERING: return "Exposure, Metering Mode";
777 case V4L2_CID_SCENE_MODE: return "Scene Mode";
778 case V4L2_CID_3A_LOCK: return "3A Lock";
779 case V4L2_CID_AUTO_FOCUS_START: return "Auto Focus, Start";
780 case V4L2_CID_AUTO_FOCUS_STOP: return "Auto Focus, Stop";
781 case V4L2_CID_AUTO_FOCUS_STATUS: return "Auto Focus, Status";
782 case V4L2_CID_AUTO_FOCUS_RANGE: return "Auto Focus, Range";
783
784 /* FM Radio Modulator control */
785 /* Keep the order of the 'case's the same as in videodev2.h! */
786 case V4L2_CID_FM_TX_CLASS: return "FM Radio Modulator Controls";
787 case V4L2_CID_RDS_TX_DEVIATION: return "RDS Signal Deviation";
788 case V4L2_CID_RDS_TX_PI: return "RDS Program ID";
789 case V4L2_CID_RDS_TX_PTY: return "RDS Program Type";
790 case V4L2_CID_RDS_TX_PS_NAME: return "RDS PS Name";
791 case V4L2_CID_RDS_TX_RADIO_TEXT: return "RDS Radio Text";
792 case V4L2_CID_AUDIO_LIMITER_ENABLED: return "Audio Limiter Feature Enabled";
793 case V4L2_CID_AUDIO_LIMITER_RELEASE_TIME: return "Audio Limiter Release Time";
794 case V4L2_CID_AUDIO_LIMITER_DEVIATION: return "Audio Limiter Deviation";
795 case V4L2_CID_AUDIO_COMPRESSION_ENABLED: return "Audio Compression Enabled";
796 case V4L2_CID_AUDIO_COMPRESSION_GAIN: return "Audio Compression Gain";
797 case V4L2_CID_AUDIO_COMPRESSION_THRESHOLD: return "Audio Compression Threshold";
798 case V4L2_CID_AUDIO_COMPRESSION_ATTACK_TIME: return "Audio Compression Attack Time";
799 case V4L2_CID_AUDIO_COMPRESSION_RELEASE_TIME: return "Audio Compression Release Time";
800 case V4L2_CID_PILOT_TONE_ENABLED: return "Pilot Tone Feature Enabled";
801 case V4L2_CID_PILOT_TONE_DEVIATION: return "Pilot Tone Deviation";
802 case V4L2_CID_PILOT_TONE_FREQUENCY: return "Pilot Tone Frequency";
803 case V4L2_CID_TUNE_PREEMPHASIS: return "Pre-Emphasis";
804 case V4L2_CID_TUNE_POWER_LEVEL: return "Tune Power Level";
805 case V4L2_CID_TUNE_ANTENNA_CAPACITOR: return "Tune Antenna Capacitor";
806
807 /* Flash controls */
808 case V4L2_CID_FLASH_CLASS: return "Flash Controls";
809 case V4L2_CID_FLASH_LED_MODE: return "LED Mode";
810 case V4L2_CID_FLASH_STROBE_SOURCE: return "Strobe Source";
811 case V4L2_CID_FLASH_STROBE: return "Strobe";
812 case V4L2_CID_FLASH_STROBE_STOP: return "Stop Strobe";
813 case V4L2_CID_FLASH_STROBE_STATUS: return "Strobe Status";
814 case V4L2_CID_FLASH_TIMEOUT: return "Strobe Timeout";
815 case V4L2_CID_FLASH_INTENSITY: return "Intensity, Flash Mode";
816 case V4L2_CID_FLASH_TORCH_INTENSITY: return "Intensity, Torch Mode";
817 case V4L2_CID_FLASH_INDICATOR_INTENSITY: return "Intensity, Indicator";
818 case V4L2_CID_FLASH_FAULT: return "Faults";
819 case V4L2_CID_FLASH_CHARGE: return "Charge";
820 case V4L2_CID_FLASH_READY: return "Ready to Strobe";
821
822 /* JPEG encoder controls */
823 /* Keep the order of the 'case's the same as in videodev2.h! */
824 case V4L2_CID_JPEG_CLASS: return "JPEG Compression Controls";
825 case V4L2_CID_JPEG_CHROMA_SUBSAMPLING: return "Chroma Subsampling";
826 case V4L2_CID_JPEG_RESTART_INTERVAL: return "Restart Interval";
827 case V4L2_CID_JPEG_COMPRESSION_QUALITY: return "Compression Quality";
828 case V4L2_CID_JPEG_ACTIVE_MARKER: return "Active Markers";
829
830 /* Image source controls */
831 case V4L2_CID_IMAGE_SOURCE_CLASS: return "Image Source Controls";
832 case V4L2_CID_VBLANK: return "Vertical Blanking";
833 case V4L2_CID_HBLANK: return "Horizontal Blanking";
834 case V4L2_CID_ANALOGUE_GAIN: return "Analogue Gain";
835
836 /* Image processing controls */
837 case V4L2_CID_IMAGE_PROC_CLASS: return "Image Processing Controls";
838 case V4L2_CID_LINK_FREQ: return "Link Frequency";
839 case V4L2_CID_PIXEL_RATE: return "Pixel Rate";
840 case V4L2_CID_TEST_PATTERN: return "Test Pattern";
841
842 /* DV controls */
843 case V4L2_CID_DV_CLASS: return "Digital Video Controls";
844 case V4L2_CID_DV_TX_HOTPLUG: return "Hotplug Present";
845 case V4L2_CID_DV_TX_RXSENSE: return "RxSense Present";
846 case V4L2_CID_DV_TX_EDID_PRESENT: return "EDID Present";
847 case V4L2_CID_DV_TX_MODE: return "Transmit Mode";
848 case V4L2_CID_DV_TX_RGB_RANGE: return "Tx RGB Quantization Range";
849 case V4L2_CID_DV_RX_POWER_PRESENT: return "Power Present";
850 case V4L2_CID_DV_RX_RGB_RANGE: return "Rx RGB Quantization Range";
851
852 case V4L2_CID_FM_RX_CLASS: return "FM Radio Receiver Controls";
853 case V4L2_CID_TUNE_DEEMPHASIS: return "De-Emphasis";
854 case V4L2_CID_RDS_RECEPTION: return "RDS Reception";
855 default:
856 return NULL;
857 }
858 }
859 EXPORT_SYMBOL(v4l2_ctrl_get_name);
860
861 void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type,
862 s32 *min, s32 *max, s32 *step, s32 *def, u32 *flags)
863 {
864 *name = v4l2_ctrl_get_name(id);
865 *flags = 0;
866
867 switch (id) {
868 case V4L2_CID_AUDIO_MUTE:
869 case V4L2_CID_AUDIO_LOUDNESS:
870 case V4L2_CID_AUTO_WHITE_BALANCE:
871 case V4L2_CID_AUTOGAIN:
872 case V4L2_CID_HFLIP:
873 case V4L2_CID_VFLIP:
874 case V4L2_CID_HUE_AUTO:
875 case V4L2_CID_CHROMA_AGC:
876 case V4L2_CID_COLOR_KILLER:
877 case V4L2_CID_AUTOBRIGHTNESS:
878 case V4L2_CID_MPEG_AUDIO_MUTE:
879 case V4L2_CID_MPEG_VIDEO_MUTE:
880 case V4L2_CID_MPEG_VIDEO_GOP_CLOSURE:
881 case V4L2_CID_MPEG_VIDEO_PULLDOWN:
882 case V4L2_CID_EXPOSURE_AUTO_PRIORITY:
883 case V4L2_CID_FOCUS_AUTO:
884 case V4L2_CID_PRIVACY:
885 case V4L2_CID_AUDIO_LIMITER_ENABLED:
886 case V4L2_CID_AUDIO_COMPRESSION_ENABLED:
887 case V4L2_CID_PILOT_TONE_ENABLED:
888 case V4L2_CID_ILLUMINATORS_1:
889 case V4L2_CID_ILLUMINATORS_2:
890 case V4L2_CID_FLASH_STROBE_STATUS:
891 case V4L2_CID_FLASH_CHARGE:
892 case V4L2_CID_FLASH_READY:
893 case V4L2_CID_MPEG_VIDEO_DECODER_MPEG4_DEBLOCK_FILTER:
894 case V4L2_CID_MPEG_VIDEO_DECODER_SLICE_INTERFACE:
895 case V4L2_CID_MPEG_VIDEO_FRAME_RC_ENABLE:
896 case V4L2_CID_MPEG_VIDEO_MB_RC_ENABLE:
897 case V4L2_CID_MPEG_VIDEO_H264_8X8_TRANSFORM:
898 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_ENABLE:
899 case V4L2_CID_MPEG_VIDEO_MPEG4_QPEL:
900 case V4L2_CID_MPEG_VIDEO_REPEAT_SEQ_HEADER:
901 case V4L2_CID_WIDE_DYNAMIC_RANGE:
902 case V4L2_CID_IMAGE_STABILIZATION:
903 case V4L2_CID_RDS_RECEPTION:
904 *type = V4L2_CTRL_TYPE_BOOLEAN;
905 *min = 0;
906 *max = *step = 1;
907 break;
908 case V4L2_CID_PAN_RESET:
909 case V4L2_CID_TILT_RESET:
910 case V4L2_CID_FLASH_STROBE:
911 case V4L2_CID_FLASH_STROBE_STOP:
912 case V4L2_CID_AUTO_FOCUS_START:
913 case V4L2_CID_AUTO_FOCUS_STOP:
914 *type = V4L2_CTRL_TYPE_BUTTON;
915 *flags |= V4L2_CTRL_FLAG_WRITE_ONLY;
916 *min = *max = *step = *def = 0;
917 break;
918 case V4L2_CID_POWER_LINE_FREQUENCY:
919 case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ:
920 case V4L2_CID_MPEG_AUDIO_ENCODING:
921 case V4L2_CID_MPEG_AUDIO_L1_BITRATE:
922 case V4L2_CID_MPEG_AUDIO_L2_BITRATE:
923 case V4L2_CID_MPEG_AUDIO_L3_BITRATE:
924 case V4L2_CID_MPEG_AUDIO_AC3_BITRATE:
925 case V4L2_CID_MPEG_AUDIO_MODE:
926 case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION:
927 case V4L2_CID_MPEG_AUDIO_EMPHASIS:
928 case V4L2_CID_MPEG_AUDIO_CRC:
929 case V4L2_CID_MPEG_AUDIO_DEC_PLAYBACK:
930 case V4L2_CID_MPEG_AUDIO_DEC_MULTILINGUAL_PLAYBACK:
931 case V4L2_CID_MPEG_VIDEO_ENCODING:
932 case V4L2_CID_MPEG_VIDEO_ASPECT:
933 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
934 case V4L2_CID_MPEG_STREAM_TYPE:
935 case V4L2_CID_MPEG_STREAM_VBI_FMT:
936 case V4L2_CID_EXPOSURE_AUTO:
937 case V4L2_CID_AUTO_FOCUS_RANGE:
938 case V4L2_CID_COLORFX:
939 case V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE:
940 case V4L2_CID_TUNE_PREEMPHASIS:
941 case V4L2_CID_FLASH_LED_MODE:
942 case V4L2_CID_FLASH_STROBE_SOURCE:
943 case V4L2_CID_MPEG_VIDEO_HEADER_MODE:
944 case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE:
945 case V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE:
946 case V4L2_CID_MPEG_VIDEO_H264_LEVEL:
947 case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE:
948 case V4L2_CID_MPEG_VIDEO_H264_PROFILE:
949 case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC:
950 case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE:
951 case V4L2_CID_MPEG_VIDEO_H264_FMO_MAP_TYPE:
952 case V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL:
953 case V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE:
954 case V4L2_CID_JPEG_CHROMA_SUBSAMPLING:
955 case V4L2_CID_ISO_SENSITIVITY_AUTO:
956 case V4L2_CID_EXPOSURE_METERING:
957 case V4L2_CID_SCENE_MODE:
958 case V4L2_CID_DV_TX_MODE:
959 case V4L2_CID_DV_TX_RGB_RANGE:
960 case V4L2_CID_DV_RX_RGB_RANGE:
961 case V4L2_CID_TEST_PATTERN:
962 case V4L2_CID_TUNE_DEEMPHASIS:
963 case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_SEL:
964 *type = V4L2_CTRL_TYPE_MENU;
965 break;
966 case V4L2_CID_LINK_FREQ:
967 *type = V4L2_CTRL_TYPE_INTEGER_MENU;
968 break;
969 case V4L2_CID_RDS_TX_PS_NAME:
970 case V4L2_CID_RDS_TX_RADIO_TEXT:
971 *type = V4L2_CTRL_TYPE_STRING;
972 break;
973 case V4L2_CID_ISO_SENSITIVITY:
974 case V4L2_CID_AUTO_EXPOSURE_BIAS:
975 case V4L2_CID_MPEG_VIDEO_VPX_NUM_PARTITIONS:
976 case V4L2_CID_MPEG_VIDEO_VPX_NUM_REF_FRAMES:
977 *type = V4L2_CTRL_TYPE_INTEGER_MENU;
978 break;
979 case V4L2_CID_USER_CLASS:
980 case V4L2_CID_CAMERA_CLASS:
981 case V4L2_CID_MPEG_CLASS:
982 case V4L2_CID_FM_TX_CLASS:
983 case V4L2_CID_FLASH_CLASS:
984 case V4L2_CID_JPEG_CLASS:
985 case V4L2_CID_IMAGE_SOURCE_CLASS:
986 case V4L2_CID_IMAGE_PROC_CLASS:
987 case V4L2_CID_DV_CLASS:
988 case V4L2_CID_FM_RX_CLASS:
989 *type = V4L2_CTRL_TYPE_CTRL_CLASS;
990 /* You can neither read not write these */
991 *flags |= V4L2_CTRL_FLAG_READ_ONLY | V4L2_CTRL_FLAG_WRITE_ONLY;
992 *min = *max = *step = *def = 0;
993 break;
994 case V4L2_CID_BG_COLOR:
995 *type = V4L2_CTRL_TYPE_INTEGER;
996 *step = 1;
997 *min = 0;
998 /* Max is calculated as RGB888 that is 2^24 */
999 *max = 0xFFFFFF;
1000 break;
1001 case V4L2_CID_FLASH_FAULT:
1002 case V4L2_CID_JPEG_ACTIVE_MARKER:
1003 case V4L2_CID_3A_LOCK:
1004 case V4L2_CID_AUTO_FOCUS_STATUS:
1005 case V4L2_CID_DV_TX_HOTPLUG:
1006 case V4L2_CID_DV_TX_RXSENSE:
1007 case V4L2_CID_DV_TX_EDID_PRESENT:
1008 case V4L2_CID_DV_RX_POWER_PRESENT:
1009 *type = V4L2_CTRL_TYPE_BITMASK;
1010 break;
1011 case V4L2_CID_MIN_BUFFERS_FOR_CAPTURE:
1012 case V4L2_CID_MIN_BUFFERS_FOR_OUTPUT:
1013 *type = V4L2_CTRL_TYPE_INTEGER;
1014 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
1015 break;
1016 case V4L2_CID_MPEG_VIDEO_DEC_FRAME:
1017 case V4L2_CID_MPEG_VIDEO_DEC_PTS:
1018 *flags |= V4L2_CTRL_FLAG_VOLATILE;
1019 /* Fall through */
1020 case V4L2_CID_PIXEL_RATE:
1021 *type = V4L2_CTRL_TYPE_INTEGER64;
1022 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
1023 *min = *max = *step = *def = 0;
1024 break;
1025 default:
1026 *type = V4L2_CTRL_TYPE_INTEGER;
1027 break;
1028 }
1029 switch (id) {
1030 case V4L2_CID_MPEG_AUDIO_ENCODING:
1031 case V4L2_CID_MPEG_AUDIO_MODE:
1032 case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
1033 case V4L2_CID_MPEG_VIDEO_B_FRAMES:
1034 case V4L2_CID_MPEG_STREAM_TYPE:
1035 *flags |= V4L2_CTRL_FLAG_UPDATE;
1036 break;
1037 case V4L2_CID_AUDIO_VOLUME:
1038 case V4L2_CID_AUDIO_BALANCE:
1039 case V4L2_CID_AUDIO_BASS:
1040 case V4L2_CID_AUDIO_TREBLE:
1041 case V4L2_CID_BRIGHTNESS:
1042 case V4L2_CID_CONTRAST:
1043 case V4L2_CID_SATURATION:
1044 case V4L2_CID_HUE:
1045 case V4L2_CID_RED_BALANCE:
1046 case V4L2_CID_BLUE_BALANCE:
1047 case V4L2_CID_GAMMA:
1048 case V4L2_CID_SHARPNESS:
1049 case V4L2_CID_CHROMA_GAIN:
1050 case V4L2_CID_RDS_TX_DEVIATION:
1051 case V4L2_CID_AUDIO_LIMITER_RELEASE_TIME:
1052 case V4L2_CID_AUDIO_LIMITER_DEVIATION:
1053 case V4L2_CID_AUDIO_COMPRESSION_GAIN:
1054 case V4L2_CID_AUDIO_COMPRESSION_THRESHOLD:
1055 case V4L2_CID_AUDIO_COMPRESSION_ATTACK_TIME:
1056 case V4L2_CID_AUDIO_COMPRESSION_RELEASE_TIME:
1057 case V4L2_CID_PILOT_TONE_DEVIATION:
1058 case V4L2_CID_PILOT_TONE_FREQUENCY:
1059 case V4L2_CID_TUNE_POWER_LEVEL:
1060 case V4L2_CID_TUNE_ANTENNA_CAPACITOR:
1061 *flags |= V4L2_CTRL_FLAG_SLIDER;
1062 break;
1063 case V4L2_CID_PAN_RELATIVE:
1064 case V4L2_CID_TILT_RELATIVE:
1065 case V4L2_CID_FOCUS_RELATIVE:
1066 case V4L2_CID_IRIS_RELATIVE:
1067 case V4L2_CID_ZOOM_RELATIVE:
1068 *flags |= V4L2_CTRL_FLAG_WRITE_ONLY;
1069 break;
1070 case V4L2_CID_FLASH_STROBE_STATUS:
1071 case V4L2_CID_AUTO_FOCUS_STATUS:
1072 case V4L2_CID_FLASH_READY:
1073 case V4L2_CID_DV_TX_HOTPLUG:
1074 case V4L2_CID_DV_TX_RXSENSE:
1075 case V4L2_CID_DV_TX_EDID_PRESENT:
1076 case V4L2_CID_DV_RX_POWER_PRESENT:
1077 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
1078 break;
1079 }
1080 }
1081 EXPORT_SYMBOL(v4l2_ctrl_fill);
1082
1083 /* Helper function to determine whether the control type is compatible with
1084 VIDIOC_G/S_CTRL. */
1085 static bool type_is_int(const struct v4l2_ctrl *ctrl)
1086 {
1087 switch (ctrl->type) {
1088 case V4L2_CTRL_TYPE_INTEGER64:
1089 case V4L2_CTRL_TYPE_STRING:
1090 /* Nope, these need v4l2_ext_control */
1091 return false;
1092 default:
1093 return true;
1094 }
1095 }
1096
1097 static void fill_event(struct v4l2_event *ev, struct v4l2_ctrl *ctrl, u32 changes)
1098 {
1099 memset(ev->reserved, 0, sizeof(ev->reserved));
1100 ev->type = V4L2_EVENT_CTRL;
1101 ev->id = ctrl->id;
1102 ev->u.ctrl.changes = changes;
1103 ev->u.ctrl.type = ctrl->type;
1104 ev->u.ctrl.flags = ctrl->flags;
1105 if (ctrl->type == V4L2_CTRL_TYPE_STRING)
1106 ev->u.ctrl.value64 = 0;
1107 else
1108 ev->u.ctrl.value64 = ctrl->cur.val64;
1109 ev->u.ctrl.minimum = ctrl->minimum;
1110 ev->u.ctrl.maximum = ctrl->maximum;
1111 if (ctrl->type == V4L2_CTRL_TYPE_MENU
1112 || ctrl->type == V4L2_CTRL_TYPE_INTEGER_MENU)
1113 ev->u.ctrl.step = 1;
1114 else
1115 ev->u.ctrl.step = ctrl->step;
1116 ev->u.ctrl.default_value = ctrl->default_value;
1117 }
1118
1119 static void send_event(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, u32 changes)
1120 {
1121 struct v4l2_event ev;
1122 struct v4l2_subscribed_event *sev;
1123
1124 if (list_empty(&ctrl->ev_subs))
1125 return;
1126 fill_event(&ev, ctrl, changes);
1127
1128 list_for_each_entry(sev, &ctrl->ev_subs, node)
1129 if (sev->fh != fh ||
1130 (sev->flags & V4L2_EVENT_SUB_FL_ALLOW_FEEDBACK))
1131 v4l2_event_queue_fh(sev->fh, &ev);
1132 }
1133
1134 /* Helper function: copy the current control value back to the caller */
1135 static int cur_to_user(struct v4l2_ext_control *c,
1136 struct v4l2_ctrl *ctrl)
1137 {
1138 u32 len;
1139
1140 switch (ctrl->type) {
1141 case V4L2_CTRL_TYPE_STRING:
1142 len = strlen(ctrl->cur.string);
1143 if (c->size < len + 1) {
1144 c->size = len + 1;
1145 return -ENOSPC;
1146 }
1147 return copy_to_user(c->string, ctrl->cur.string,
1148 len + 1) ? -EFAULT : 0;
1149 case V4L2_CTRL_TYPE_INTEGER64:
1150 c->value64 = ctrl->cur.val64;
1151 break;
1152 default:
1153 c->value = ctrl->cur.val;
1154 break;
1155 }
1156 return 0;
1157 }
1158
1159 /* Helper function: copy the caller-provider value as the new control value */
1160 static int user_to_new(struct v4l2_ext_control *c,
1161 struct v4l2_ctrl *ctrl)
1162 {
1163 int ret;
1164 u32 size;
1165
1166 ctrl->is_new = 1;
1167 switch (ctrl->type) {
1168 case V4L2_CTRL_TYPE_INTEGER64:
1169 ctrl->val64 = c->value64;
1170 break;
1171 case V4L2_CTRL_TYPE_STRING:
1172 size = c->size;
1173 if (size == 0)
1174 return -ERANGE;
1175 if (size > ctrl->maximum + 1)
1176 size = ctrl->maximum + 1;
1177 ret = copy_from_user(ctrl->string, c->string, size);
1178 if (!ret) {
1179 char last = ctrl->string[size - 1];
1180
1181 ctrl->string[size - 1] = 0;
1182 /* If the string was longer than ctrl->maximum,
1183 then return an error. */
1184 if (strlen(ctrl->string) == ctrl->maximum && last)
1185 return -ERANGE;
1186 }
1187 return ret ? -EFAULT : 0;
1188 default:
1189 ctrl->val = c->value;
1190 break;
1191 }
1192 return 0;
1193 }
1194
1195 /* Helper function: copy the new control value back to the caller */
1196 static int new_to_user(struct v4l2_ext_control *c,
1197 struct v4l2_ctrl *ctrl)
1198 {
1199 u32 len;
1200
1201 switch (ctrl->type) {
1202 case V4L2_CTRL_TYPE_STRING:
1203 len = strlen(ctrl->string);
1204 if (c->size < len + 1) {
1205 c->size = ctrl->maximum + 1;
1206 return -ENOSPC;
1207 }
1208 return copy_to_user(c->string, ctrl->string,
1209 len + 1) ? -EFAULT : 0;
1210 case V4L2_CTRL_TYPE_INTEGER64:
1211 c->value64 = ctrl->val64;
1212 break;
1213 default:
1214 c->value = ctrl->val;
1215 break;
1216 }
1217 return 0;
1218 }
1219
1220 /* Copy the new value to the current value. */
1221 static void new_to_cur(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, u32 ch_flags)
1222 {
1223 bool changed = false;
1224
1225 if (ctrl == NULL)
1226 return;
1227 switch (ctrl->type) {
1228 case V4L2_CTRL_TYPE_BUTTON:
1229 changed = true;
1230 break;
1231 case V4L2_CTRL_TYPE_STRING:
1232 /* strings are always 0-terminated */
1233 changed = strcmp(ctrl->string, ctrl->cur.string);
1234 strcpy(ctrl->cur.string, ctrl->string);
1235 break;
1236 case V4L2_CTRL_TYPE_INTEGER64:
1237 changed = ctrl->val64 != ctrl->cur.val64;
1238 ctrl->cur.val64 = ctrl->val64;
1239 break;
1240 default:
1241 changed = ctrl->val != ctrl->cur.val;
1242 ctrl->cur.val = ctrl->val;
1243 break;
1244 }
1245 if (ch_flags & V4L2_EVENT_CTRL_CH_FLAGS) {
1246 /* Note: CH_FLAGS is only set for auto clusters. */
1247 ctrl->flags &=
1248 ~(V4L2_CTRL_FLAG_INACTIVE | V4L2_CTRL_FLAG_VOLATILE);
1249 if (!is_cur_manual(ctrl->cluster[0])) {
1250 ctrl->flags |= V4L2_CTRL_FLAG_INACTIVE;
1251 if (ctrl->cluster[0]->has_volatiles)
1252 ctrl->flags |= V4L2_CTRL_FLAG_VOLATILE;
1253 }
1254 fh = NULL;
1255 }
1256 if (changed || ch_flags) {
1257 /* If a control was changed that was not one of the controls
1258 modified by the application, then send the event to all. */
1259 if (!ctrl->is_new)
1260 fh = NULL;
1261 send_event(fh, ctrl,
1262 (changed ? V4L2_EVENT_CTRL_CH_VALUE : 0) | ch_flags);
1263 if (ctrl->call_notify && changed && ctrl->handler->notify)
1264 ctrl->handler->notify(ctrl, ctrl->handler->notify_priv);
1265 }
1266 }
1267
1268 /* Copy the current value to the new value */
1269 static void cur_to_new(struct v4l2_ctrl *ctrl)
1270 {
1271 if (ctrl == NULL)
1272 return;
1273 switch (ctrl->type) {
1274 case V4L2_CTRL_TYPE_STRING:
1275 /* strings are always 0-terminated */
1276 strcpy(ctrl->string, ctrl->cur.string);
1277 break;
1278 case V4L2_CTRL_TYPE_INTEGER64:
1279 ctrl->val64 = ctrl->cur.val64;
1280 break;
1281 default:
1282 ctrl->val = ctrl->cur.val;
1283 break;
1284 }
1285 }
1286
1287 /* Return non-zero if one or more of the controls in the cluster has a new
1288 value that differs from the current value. */
1289 static int cluster_changed(struct v4l2_ctrl *master)
1290 {
1291 int diff = 0;
1292 int i;
1293
1294 for (i = 0; !diff && i < master->ncontrols; i++) {
1295 struct v4l2_ctrl *ctrl = master->cluster[i];
1296
1297 if (ctrl == NULL)
1298 continue;
1299 switch (ctrl->type) {
1300 case V4L2_CTRL_TYPE_BUTTON:
1301 /* Button controls are always 'different' */
1302 return 1;
1303 case V4L2_CTRL_TYPE_STRING:
1304 /* strings are always 0-terminated */
1305 diff = strcmp(ctrl->string, ctrl->cur.string);
1306 break;
1307 case V4L2_CTRL_TYPE_INTEGER64:
1308 diff = ctrl->val64 != ctrl->cur.val64;
1309 break;
1310 default:
1311 diff = ctrl->val != ctrl->cur.val;
1312 break;
1313 }
1314 }
1315 return diff;
1316 }
1317
1318 /* Control range checking */
1319 static int check_range(enum v4l2_ctrl_type type,
1320 s32 min, s32 max, u32 step, s32 def)
1321 {
1322 switch (type) {
1323 case V4L2_CTRL_TYPE_BOOLEAN:
1324 if (step != 1 || max > 1 || min < 0)
1325 return -ERANGE;
1326 /* fall through */
1327 case V4L2_CTRL_TYPE_INTEGER:
1328 if (step <= 0 || min > max || def < min || def > max)
1329 return -ERANGE;
1330 return 0;
1331 case V4L2_CTRL_TYPE_BITMASK:
1332 if (step || min || !max || (def & ~max))
1333 return -ERANGE;
1334 return 0;
1335 case V4L2_CTRL_TYPE_MENU:
1336 case V4L2_CTRL_TYPE_INTEGER_MENU:
1337 if (min > max || def < min || def > max)
1338 return -ERANGE;
1339 /* Note: step == menu_skip_mask for menu controls.
1340 So here we check if the default value is masked out. */
1341 if (step && ((1 << def) & step))
1342 return -EINVAL;
1343 return 0;
1344 case V4L2_CTRL_TYPE_STRING:
1345 if (min > max || min < 0 || step < 1 || def)
1346 return -ERANGE;
1347 return 0;
1348 default:
1349 return 0;
1350 }
1351 }
1352
1353 /* Validate a new control */
1354 static int validate_new(const struct v4l2_ctrl *ctrl,
1355 struct v4l2_ext_control *c)
1356 {
1357 size_t len;
1358 u32 offset;
1359 s32 val;
1360
1361 switch (ctrl->type) {
1362 case V4L2_CTRL_TYPE_INTEGER:
1363 /* Round towards the closest legal value */
1364 val = c->value + ctrl->step / 2;
1365 val = clamp(val, ctrl->minimum, ctrl->maximum);
1366 offset = val - ctrl->minimum;
1367 offset = ctrl->step * (offset / ctrl->step);
1368 c->value = ctrl->minimum + offset;
1369 return 0;
1370
1371 case V4L2_CTRL_TYPE_BOOLEAN:
1372 c->value = !!c->value;
1373 return 0;
1374
1375 case V4L2_CTRL_TYPE_MENU:
1376 case V4L2_CTRL_TYPE_INTEGER_MENU:
1377 if (c->value < ctrl->minimum || c->value > ctrl->maximum)
1378 return -ERANGE;
1379 if (ctrl->menu_skip_mask & (1 << c->value))
1380 return -EINVAL;
1381 if (ctrl->type == V4L2_CTRL_TYPE_MENU &&
1382 ctrl->qmenu[c->value][0] == '\0')
1383 return -EINVAL;
1384 return 0;
1385
1386 case V4L2_CTRL_TYPE_BITMASK:
1387 c->value &= ctrl->maximum;
1388 return 0;
1389
1390 case V4L2_CTRL_TYPE_BUTTON:
1391 case V4L2_CTRL_TYPE_CTRL_CLASS:
1392 c->value = 0;
1393 return 0;
1394
1395 case V4L2_CTRL_TYPE_INTEGER64:
1396 return 0;
1397
1398 case V4L2_CTRL_TYPE_STRING:
1399 len = strlen(c->string);
1400 if (len < ctrl->minimum)
1401 return -ERANGE;
1402 if ((len - ctrl->minimum) % ctrl->step)
1403 return -ERANGE;
1404 return 0;
1405
1406 default:
1407 return -EINVAL;
1408 }
1409 }
1410
1411 static inline u32 node2id(struct list_head *node)
1412 {
1413 return list_entry(node, struct v4l2_ctrl_ref, node)->ctrl->id;
1414 }
1415
1416 /* Set the handler's error code if it wasn't set earlier already */
1417 static inline int handler_set_err(struct v4l2_ctrl_handler *hdl, int err)
1418 {
1419 if (hdl->error == 0)
1420 hdl->error = err;
1421 return err;
1422 }
1423
1424 /* Initialize the handler */
1425 int v4l2_ctrl_handler_init_class(struct v4l2_ctrl_handler *hdl,
1426 unsigned nr_of_controls_hint,
1427 struct lock_class_key *key, const char *name)
1428 {
1429 hdl->lock = &hdl->_lock;
1430 mutex_init(hdl->lock);
1431 lockdep_set_class_and_name(hdl->lock, key, name);
1432 INIT_LIST_HEAD(&hdl->ctrls);
1433 INIT_LIST_HEAD(&hdl->ctrl_refs);
1434 hdl->nr_of_buckets = 1 + nr_of_controls_hint / 8;
1435 hdl->buckets = kcalloc(hdl->nr_of_buckets, sizeof(hdl->buckets[0]),
1436 GFP_KERNEL);
1437 hdl->error = hdl->buckets ? 0 : -ENOMEM;
1438 return hdl->error;
1439 }
1440 EXPORT_SYMBOL(v4l2_ctrl_handler_init_class);
1441
1442 /* Free all controls and control refs */
1443 void v4l2_ctrl_handler_free(struct v4l2_ctrl_handler *hdl)
1444 {
1445 struct v4l2_ctrl_ref *ref, *next_ref;
1446 struct v4l2_ctrl *ctrl, *next_ctrl;
1447 struct v4l2_subscribed_event *sev, *next_sev;
1448
1449 if (hdl == NULL || hdl->buckets == NULL)
1450 return;
1451
1452 mutex_lock(hdl->lock);
1453 /* Free all nodes */
1454 list_for_each_entry_safe(ref, next_ref, &hdl->ctrl_refs, node) {
1455 list_del(&ref->node);
1456 kfree(ref);
1457 }
1458 /* Free all controls owned by the handler */
1459 list_for_each_entry_safe(ctrl, next_ctrl, &hdl->ctrls, node) {
1460 list_del(&ctrl->node);
1461 list_for_each_entry_safe(sev, next_sev, &ctrl->ev_subs, node)
1462 list_del(&sev->node);
1463 kfree(ctrl);
1464 }
1465 kfree(hdl->buckets);
1466 hdl->buckets = NULL;
1467 hdl->cached = NULL;
1468 hdl->error = 0;
1469 mutex_unlock(hdl->lock);
1470 }
1471 EXPORT_SYMBOL(v4l2_ctrl_handler_free);
1472
1473 /* For backwards compatibility: V4L2_CID_PRIVATE_BASE should no longer
1474 be used except in G_CTRL, S_CTRL, QUERYCTRL and QUERYMENU when dealing
1475 with applications that do not use the NEXT_CTRL flag.
1476
1477 We just find the n-th private user control. It's O(N), but that should not
1478 be an issue in this particular case. */
1479 static struct v4l2_ctrl_ref *find_private_ref(
1480 struct v4l2_ctrl_handler *hdl, u32 id)
1481 {
1482 struct v4l2_ctrl_ref *ref;
1483
1484 id -= V4L2_CID_PRIVATE_BASE;
1485 list_for_each_entry(ref, &hdl->ctrl_refs, node) {
1486 /* Search for private user controls that are compatible with
1487 VIDIOC_G/S_CTRL. */
1488 if (V4L2_CTRL_ID2CLASS(ref->ctrl->id) == V4L2_CTRL_CLASS_USER &&
1489 V4L2_CTRL_DRIVER_PRIV(ref->ctrl->id)) {
1490 if (!type_is_int(ref->ctrl))
1491 continue;
1492 if (id == 0)
1493 return ref;
1494 id--;
1495 }
1496 }
1497 return NULL;
1498 }
1499
1500 /* Find a control with the given ID. */
1501 static struct v4l2_ctrl_ref *find_ref(struct v4l2_ctrl_handler *hdl, u32 id)
1502 {
1503 struct v4l2_ctrl_ref *ref;
1504 int bucket;
1505
1506 id &= V4L2_CTRL_ID_MASK;
1507
1508 /* Old-style private controls need special handling */
1509 if (id >= V4L2_CID_PRIVATE_BASE)
1510 return find_private_ref(hdl, id);
1511 bucket = id % hdl->nr_of_buckets;
1512
1513 /* Simple optimization: cache the last control found */
1514 if (hdl->cached && hdl->cached->ctrl->id == id)
1515 return hdl->cached;
1516
1517 /* Not in cache, search the hash */
1518 ref = hdl->buckets ? hdl->buckets[bucket] : NULL;
1519 while (ref && ref->ctrl->id != id)
1520 ref = ref->next;
1521
1522 if (ref)
1523 hdl->cached = ref; /* cache it! */
1524 return ref;
1525 }
1526
1527 /* Find a control with the given ID. Take the handler's lock first. */
1528 static struct v4l2_ctrl_ref *find_ref_lock(
1529 struct v4l2_ctrl_handler *hdl, u32 id)
1530 {
1531 struct v4l2_ctrl_ref *ref = NULL;
1532
1533 if (hdl) {
1534 mutex_lock(hdl->lock);
1535 ref = find_ref(hdl, id);
1536 mutex_unlock(hdl->lock);
1537 }
1538 return ref;
1539 }
1540
1541 /* Find a control with the given ID. */
1542 struct v4l2_ctrl *v4l2_ctrl_find(struct v4l2_ctrl_handler *hdl, u32 id)
1543 {
1544 struct v4l2_ctrl_ref *ref = find_ref_lock(hdl, id);
1545
1546 return ref ? ref->ctrl : NULL;
1547 }
1548 EXPORT_SYMBOL(v4l2_ctrl_find);
1549
1550 /* Allocate a new v4l2_ctrl_ref and hook it into the handler. */
1551 static int handler_new_ref(struct v4l2_ctrl_handler *hdl,
1552 struct v4l2_ctrl *ctrl)
1553 {
1554 struct v4l2_ctrl_ref *ref;
1555 struct v4l2_ctrl_ref *new_ref;
1556 u32 id = ctrl->id;
1557 u32 class_ctrl = V4L2_CTRL_ID2CLASS(id) | 1;
1558 int bucket = id % hdl->nr_of_buckets; /* which bucket to use */
1559
1560 /* Automatically add the control class if it is not yet present. */
1561 if (id != class_ctrl && find_ref_lock(hdl, class_ctrl) == NULL)
1562 if (!v4l2_ctrl_new_std(hdl, NULL, class_ctrl, 0, 0, 0, 0))
1563 return hdl->error;
1564
1565 if (hdl->error)
1566 return hdl->error;
1567
1568 new_ref = kzalloc(sizeof(*new_ref), GFP_KERNEL);
1569 if (!new_ref)
1570 return handler_set_err(hdl, -ENOMEM);
1571 new_ref->ctrl = ctrl;
1572 if (ctrl->handler == hdl) {
1573 /* By default each control starts in a cluster of its own.
1574 new_ref->ctrl is basically a cluster array with one
1575 element, so that's perfect to use as the cluster pointer.
1576 But only do this for the handler that owns the control. */
1577 ctrl->cluster = &new_ref->ctrl;
1578 ctrl->ncontrols = 1;
1579 }
1580
1581 INIT_LIST_HEAD(&new_ref->node);
1582
1583 mutex_lock(hdl->lock);
1584
1585 /* Add immediately at the end of the list if the list is empty, or if
1586 the last element in the list has a lower ID.
1587 This ensures that when elements are added in ascending order the
1588 insertion is an O(1) operation. */
1589 if (list_empty(&hdl->ctrl_refs) || id > node2id(hdl->ctrl_refs.prev)) {
1590 list_add_tail(&new_ref->node, &hdl->ctrl_refs);
1591 goto insert_in_hash;
1592 }
1593
1594 /* Find insert position in sorted list */
1595 list_for_each_entry(ref, &hdl->ctrl_refs, node) {
1596 if (ref->ctrl->id < id)
1597 continue;
1598 /* Don't add duplicates */
1599 if (ref->ctrl->id == id) {
1600 kfree(new_ref);
1601 goto unlock;
1602 }
1603 list_add(&new_ref->node, ref->node.prev);
1604 break;
1605 }
1606
1607 insert_in_hash:
1608 /* Insert the control node in the hash */
1609 new_ref->next = hdl->buckets[bucket];
1610 hdl->buckets[bucket] = new_ref;
1611
1612 unlock:
1613 mutex_unlock(hdl->lock);
1614 return 0;
1615 }
1616
1617 /* Add a new control */
1618 static struct v4l2_ctrl *v4l2_ctrl_new(struct v4l2_ctrl_handler *hdl,
1619 const struct v4l2_ctrl_ops *ops,
1620 u32 id, const char *name, enum v4l2_ctrl_type type,
1621 s32 min, s32 max, u32 step, s32 def,
1622 u32 flags, const char * const *qmenu,
1623 const s64 *qmenu_int, void *priv)
1624 {
1625 struct v4l2_ctrl *ctrl;
1626 unsigned sz_extra = 0;
1627 int err;
1628
1629 if (hdl->error)
1630 return NULL;
1631
1632 /* Sanity checks */
1633 if (id == 0 || name == NULL || id >= V4L2_CID_PRIVATE_BASE ||
1634 (type == V4L2_CTRL_TYPE_MENU && qmenu == NULL) ||
1635 (type == V4L2_CTRL_TYPE_INTEGER_MENU && qmenu_int == NULL)) {
1636 handler_set_err(hdl, -ERANGE);
1637 return NULL;
1638 }
1639 err = check_range(type, min, max, step, def);
1640 if (err) {
1641 handler_set_err(hdl, err);
1642 return NULL;
1643 }
1644 if (type == V4L2_CTRL_TYPE_BITMASK && ((def & ~max) || min || step)) {
1645 handler_set_err(hdl, -ERANGE);
1646 return NULL;
1647 }
1648
1649 if (type == V4L2_CTRL_TYPE_BUTTON)
1650 flags |= V4L2_CTRL_FLAG_WRITE_ONLY;
1651 else if (type == V4L2_CTRL_TYPE_CTRL_CLASS)
1652 flags |= V4L2_CTRL_FLAG_READ_ONLY;
1653 else if (type == V4L2_CTRL_TYPE_STRING)
1654 sz_extra += 2 * (max + 1);
1655
1656 ctrl = kzalloc(sizeof(*ctrl) + sz_extra, GFP_KERNEL);
1657 if (ctrl == NULL) {
1658 handler_set_err(hdl, -ENOMEM);
1659 return NULL;
1660 }
1661
1662 INIT_LIST_HEAD(&ctrl->node);
1663 INIT_LIST_HEAD(&ctrl->ev_subs);
1664 ctrl->handler = hdl;
1665 ctrl->ops = ops;
1666 ctrl->id = id;
1667 ctrl->name = name;
1668 ctrl->type = type;
1669 ctrl->flags = flags;
1670 ctrl->minimum = min;
1671 ctrl->maximum = max;
1672 ctrl->step = step;
1673 if (type == V4L2_CTRL_TYPE_MENU)
1674 ctrl->qmenu = qmenu;
1675 else if (type == V4L2_CTRL_TYPE_INTEGER_MENU)
1676 ctrl->qmenu_int = qmenu_int;
1677 ctrl->priv = priv;
1678 ctrl->cur.val = ctrl->val = ctrl->default_value = def;
1679
1680 if (ctrl->type == V4L2_CTRL_TYPE_STRING) {
1681 ctrl->cur.string = (char *)&ctrl[1] + sz_extra - (max + 1);
1682 ctrl->string = (char *)&ctrl[1] + sz_extra - 2 * (max + 1);
1683 if (ctrl->minimum)
1684 memset(ctrl->cur.string, ' ', ctrl->minimum);
1685 }
1686 if (handler_new_ref(hdl, ctrl)) {
1687 kfree(ctrl);
1688 return NULL;
1689 }
1690 mutex_lock(hdl->lock);
1691 list_add_tail(&ctrl->node, &hdl->ctrls);
1692 mutex_unlock(hdl->lock);
1693 return ctrl;
1694 }
1695
1696 struct v4l2_ctrl *v4l2_ctrl_new_custom(struct v4l2_ctrl_handler *hdl,
1697 const struct v4l2_ctrl_config *cfg, void *priv)
1698 {
1699 bool is_menu;
1700 struct v4l2_ctrl *ctrl;
1701 const char *name = cfg->name;
1702 const char * const *qmenu = cfg->qmenu;
1703 const s64 *qmenu_int = cfg->qmenu_int;
1704 enum v4l2_ctrl_type type = cfg->type;
1705 u32 flags = cfg->flags;
1706 s32 min = cfg->min;
1707 s32 max = cfg->max;
1708 u32 step = cfg->step;
1709 s32 def = cfg->def;
1710
1711 if (name == NULL)
1712 v4l2_ctrl_fill(cfg->id, &name, &type, &min, &max, &step,
1713 &def, &flags);
1714
1715 is_menu = (cfg->type == V4L2_CTRL_TYPE_MENU ||
1716 cfg->type == V4L2_CTRL_TYPE_INTEGER_MENU);
1717 if (is_menu)
1718 WARN_ON(step);
1719 else
1720 WARN_ON(cfg->menu_skip_mask);
1721 if (cfg->type == V4L2_CTRL_TYPE_MENU && qmenu == NULL)
1722 qmenu = v4l2_ctrl_get_menu(cfg->id);
1723 else if (cfg->type == V4L2_CTRL_TYPE_INTEGER_MENU &&
1724 qmenu_int == NULL) {
1725 handler_set_err(hdl, -EINVAL);
1726 return NULL;
1727 }
1728
1729 ctrl = v4l2_ctrl_new(hdl, cfg->ops, cfg->id, name,
1730 type, min, max,
1731 is_menu ? cfg->menu_skip_mask : step,
1732 def, flags, qmenu, qmenu_int, priv);
1733 if (ctrl)
1734 ctrl->is_private = cfg->is_private;
1735 return ctrl;
1736 }
1737 EXPORT_SYMBOL(v4l2_ctrl_new_custom);
1738
1739 /* Helper function for standard non-menu controls */
1740 struct v4l2_ctrl *v4l2_ctrl_new_std(struct v4l2_ctrl_handler *hdl,
1741 const struct v4l2_ctrl_ops *ops,
1742 u32 id, s32 min, s32 max, u32 step, s32 def)
1743 {
1744 const char *name;
1745 enum v4l2_ctrl_type type;
1746 u32 flags;
1747
1748 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
1749 if (type == V4L2_CTRL_TYPE_MENU
1750 || type == V4L2_CTRL_TYPE_INTEGER_MENU) {
1751 handler_set_err(hdl, -EINVAL);
1752 return NULL;
1753 }
1754 return v4l2_ctrl_new(hdl, ops, id, name, type,
1755 min, max, step, def, flags, NULL, NULL, NULL);
1756 }
1757 EXPORT_SYMBOL(v4l2_ctrl_new_std);
1758
1759 /* Helper function for standard menu controls */
1760 struct v4l2_ctrl *v4l2_ctrl_new_std_menu(struct v4l2_ctrl_handler *hdl,
1761 const struct v4l2_ctrl_ops *ops,
1762 u32 id, s32 max, s32 mask, s32 def)
1763 {
1764 const char * const *qmenu = NULL;
1765 const s64 *qmenu_int = NULL;
1766 unsigned int qmenu_int_len = 0;
1767 const char *name;
1768 enum v4l2_ctrl_type type;
1769 s32 min;
1770 s32 step;
1771 u32 flags;
1772
1773 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
1774
1775 if (type == V4L2_CTRL_TYPE_MENU)
1776 qmenu = v4l2_ctrl_get_menu(id);
1777 else if (type == V4L2_CTRL_TYPE_INTEGER_MENU)
1778 qmenu_int = v4l2_ctrl_get_int_menu(id, &qmenu_int_len);
1779
1780 if ((!qmenu && !qmenu_int) || (qmenu_int && max > qmenu_int_len)) {
1781 handler_set_err(hdl, -EINVAL);
1782 return NULL;
1783 }
1784 return v4l2_ctrl_new(hdl, ops, id, name, type,
1785 0, max, mask, def, flags, qmenu, qmenu_int, NULL);
1786 }
1787 EXPORT_SYMBOL(v4l2_ctrl_new_std_menu);
1788
1789 /* Helper function for standard menu controls with driver defined menu */
1790 struct v4l2_ctrl *v4l2_ctrl_new_std_menu_items(struct v4l2_ctrl_handler *hdl,
1791 const struct v4l2_ctrl_ops *ops, u32 id, s32 max,
1792 s32 mask, s32 def, const char * const *qmenu)
1793 {
1794 enum v4l2_ctrl_type type;
1795 const char *name;
1796 u32 flags;
1797 s32 step;
1798 s32 min;
1799
1800 /* v4l2_ctrl_new_std_menu_items() should only be called for
1801 * standard controls without a standard menu.
1802 */
1803 if (v4l2_ctrl_get_menu(id)) {
1804 handler_set_err(hdl, -EINVAL);
1805 return NULL;
1806 }
1807
1808 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
1809 if (type != V4L2_CTRL_TYPE_MENU || qmenu == NULL) {
1810 handler_set_err(hdl, -EINVAL);
1811 return NULL;
1812 }
1813 return v4l2_ctrl_new(hdl, ops, id, name, type, 0, max, mask, def,
1814 flags, qmenu, NULL, NULL);
1815
1816 }
1817 EXPORT_SYMBOL(v4l2_ctrl_new_std_menu_items);
1818
1819 /* Helper function for standard integer menu controls */
1820 struct v4l2_ctrl *v4l2_ctrl_new_int_menu(struct v4l2_ctrl_handler *hdl,
1821 const struct v4l2_ctrl_ops *ops,
1822 u32 id, s32 max, s32 def, const s64 *qmenu_int)
1823 {
1824 const char *name;
1825 enum v4l2_ctrl_type type;
1826 s32 min;
1827 s32 step;
1828 u32 flags;
1829
1830 v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
1831 if (type != V4L2_CTRL_TYPE_INTEGER_MENU) {
1832 handler_set_err(hdl, -EINVAL);
1833 return NULL;
1834 }
1835 return v4l2_ctrl_new(hdl, ops, id, name, type,
1836 0, max, 0, def, flags, NULL, qmenu_int, NULL);
1837 }
1838 EXPORT_SYMBOL(v4l2_ctrl_new_int_menu);
1839
1840 /* Add a control from another handler to this handler */
1841 struct v4l2_ctrl *v4l2_ctrl_add_ctrl(struct v4l2_ctrl_handler *hdl,
1842 struct v4l2_ctrl *ctrl)
1843 {
1844 if (hdl == NULL || hdl->error)
1845 return NULL;
1846 if (ctrl == NULL) {
1847 handler_set_err(hdl, -EINVAL);
1848 return NULL;
1849 }
1850 if (ctrl->handler == hdl)
1851 return ctrl;
1852 return handler_new_ref(hdl, ctrl) ? NULL : ctrl;
1853 }
1854 EXPORT_SYMBOL(v4l2_ctrl_add_ctrl);
1855
1856 /* Add the controls from another handler to our own. */
1857 int v4l2_ctrl_add_handler(struct v4l2_ctrl_handler *hdl,
1858 struct v4l2_ctrl_handler *add,
1859 bool (*filter)(const struct v4l2_ctrl *ctrl))
1860 {
1861 struct v4l2_ctrl_ref *ref;
1862 int ret = 0;
1863
1864 /* Do nothing if either handler is NULL or if they are the same */
1865 if (!hdl || !add || hdl == add)
1866 return 0;
1867 if (hdl->error)
1868 return hdl->error;
1869 mutex_lock(add->lock);
1870 list_for_each_entry(ref, &add->ctrl_refs, node) {
1871 struct v4l2_ctrl *ctrl = ref->ctrl;
1872
1873 /* Skip handler-private controls. */
1874 if (ctrl->is_private)
1875 continue;
1876 /* And control classes */
1877 if (ctrl->type == V4L2_CTRL_TYPE_CTRL_CLASS)
1878 continue;
1879 /* Filter any unwanted controls */
1880 if (filter && !filter(ctrl))
1881 continue;
1882 ret = handler_new_ref(hdl, ctrl);
1883 if (ret)
1884 break;
1885 }
1886 mutex_unlock(add->lock);
1887 return ret;
1888 }
1889 EXPORT_SYMBOL(v4l2_ctrl_add_handler);
1890
1891 bool v4l2_ctrl_radio_filter(const struct v4l2_ctrl *ctrl)
1892 {
1893 if (V4L2_CTRL_ID2CLASS(ctrl->id) == V4L2_CTRL_CLASS_FM_TX)
1894 return true;
1895 if (V4L2_CTRL_ID2CLASS(ctrl->id) == V4L2_CTRL_CLASS_FM_RX)
1896 return true;
1897 switch (ctrl->id) {
1898 case V4L2_CID_AUDIO_MUTE:
1899 case V4L2_CID_AUDIO_VOLUME:
1900 case V4L2_CID_AUDIO_BALANCE:
1901 case V4L2_CID_AUDIO_BASS:
1902 case V4L2_CID_AUDIO_TREBLE:
1903 case V4L2_CID_AUDIO_LOUDNESS:
1904 return true;
1905 default:
1906 break;
1907 }
1908 return false;
1909 }
1910 EXPORT_SYMBOL(v4l2_ctrl_radio_filter);
1911
1912 /* Cluster controls */
1913 void v4l2_ctrl_cluster(unsigned ncontrols, struct v4l2_ctrl **controls)
1914 {
1915 bool has_volatiles = false;
1916 int i;
1917
1918 /* The first control is the master control and it must not be NULL */
1919 BUG_ON(ncontrols == 0 || controls[0] == NULL);
1920
1921 for (i = 0; i < ncontrols; i++) {
1922 if (controls[i]) {
1923 controls[i]->cluster = controls;
1924 controls[i]->ncontrols = ncontrols;
1925 if (controls[i]->flags & V4L2_CTRL_FLAG_VOLATILE)
1926 has_volatiles = true;
1927 }
1928 }
1929 controls[0]->has_volatiles = has_volatiles;
1930 }
1931 EXPORT_SYMBOL(v4l2_ctrl_cluster);
1932
1933 void v4l2_ctrl_auto_cluster(unsigned ncontrols, struct v4l2_ctrl **controls,
1934 u8 manual_val, bool set_volatile)
1935 {
1936 struct v4l2_ctrl *master = controls[0];
1937 u32 flag = 0;
1938 int i;
1939
1940 v4l2_ctrl_cluster(ncontrols, controls);
1941 WARN_ON(ncontrols <= 1);
1942 WARN_ON(manual_val < master->minimum || manual_val > master->maximum);
1943 WARN_ON(set_volatile && !has_op(master, g_volatile_ctrl));
1944 master->is_auto = true;
1945 master->has_volatiles = set_volatile;
1946 master->manual_mode_value = manual_val;
1947 master->flags |= V4L2_CTRL_FLAG_UPDATE;
1948
1949 if (!is_cur_manual(master))
1950 flag = V4L2_CTRL_FLAG_INACTIVE |
1951 (set_volatile ? V4L2_CTRL_FLAG_VOLATILE : 0);
1952
1953 for (i = 1; i < ncontrols; i++)
1954 if (controls[i])
1955 controls[i]->flags |= flag;
1956 }
1957 EXPORT_SYMBOL(v4l2_ctrl_auto_cluster);
1958
1959 /* Activate/deactivate a control. */
1960 void v4l2_ctrl_activate(struct v4l2_ctrl *ctrl, bool active)
1961 {
1962 /* invert since the actual flag is called 'inactive' */
1963 bool inactive = !active;
1964 bool old;
1965
1966 if (ctrl == NULL)
1967 return;
1968
1969 if (inactive)
1970 /* set V4L2_CTRL_FLAG_INACTIVE */
1971 old = test_and_set_bit(4, &ctrl->flags);
1972 else
1973 /* clear V4L2_CTRL_FLAG_INACTIVE */
1974 old = test_and_clear_bit(4, &ctrl->flags);
1975 if (old != inactive)
1976 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_FLAGS);
1977 }
1978 EXPORT_SYMBOL(v4l2_ctrl_activate);
1979
1980 /* Grab/ungrab a control.
1981 Typically used when streaming starts and you want to grab controls,
1982 preventing the user from changing them.
1983
1984 Just call this and the framework will block any attempts to change
1985 these controls. */
1986 void v4l2_ctrl_grab(struct v4l2_ctrl *ctrl, bool grabbed)
1987 {
1988 bool old;
1989
1990 if (ctrl == NULL)
1991 return;
1992
1993 v4l2_ctrl_lock(ctrl);
1994 if (grabbed)
1995 /* set V4L2_CTRL_FLAG_GRABBED */
1996 old = test_and_set_bit(1, &ctrl->flags);
1997 else
1998 /* clear V4L2_CTRL_FLAG_GRABBED */
1999 old = test_and_clear_bit(1, &ctrl->flags);
2000 if (old != grabbed)
2001 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_FLAGS);
2002 v4l2_ctrl_unlock(ctrl);
2003 }
2004 EXPORT_SYMBOL(v4l2_ctrl_grab);
2005
2006 /* Log the control name and value */
2007 static void log_ctrl(const struct v4l2_ctrl *ctrl,
2008 const char *prefix, const char *colon)
2009 {
2010 if (ctrl->flags & (V4L2_CTRL_FLAG_DISABLED | V4L2_CTRL_FLAG_WRITE_ONLY))
2011 return;
2012 if (ctrl->type == V4L2_CTRL_TYPE_CTRL_CLASS)
2013 return;
2014
2015 printk(KERN_INFO "%s%s%s: ", prefix, colon, ctrl->name);
2016
2017 switch (ctrl->type) {
2018 case V4L2_CTRL_TYPE_INTEGER:
2019 printk(KERN_CONT "%d", ctrl->cur.val);
2020 break;
2021 case V4L2_CTRL_TYPE_BOOLEAN:
2022 printk(KERN_CONT "%s", ctrl->cur.val ? "true" : "false");
2023 break;
2024 case V4L2_CTRL_TYPE_MENU:
2025 printk(KERN_CONT "%s", ctrl->qmenu[ctrl->cur.val]);
2026 break;
2027 case V4L2_CTRL_TYPE_INTEGER_MENU:
2028 printk(KERN_CONT "%lld", ctrl->qmenu_int[ctrl->cur.val]);
2029 break;
2030 case V4L2_CTRL_TYPE_BITMASK:
2031 printk(KERN_CONT "0x%08x", ctrl->cur.val);
2032 break;
2033 case V4L2_CTRL_TYPE_INTEGER64:
2034 printk(KERN_CONT "%lld", ctrl->cur.val64);
2035 break;
2036 case V4L2_CTRL_TYPE_STRING:
2037 printk(KERN_CONT "%s", ctrl->cur.string);
2038 break;
2039 default:
2040 printk(KERN_CONT "unknown type %d", ctrl->type);
2041 break;
2042 }
2043 if (ctrl->flags & (V4L2_CTRL_FLAG_INACTIVE |
2044 V4L2_CTRL_FLAG_GRABBED |
2045 V4L2_CTRL_FLAG_VOLATILE)) {
2046 if (ctrl->flags & V4L2_CTRL_FLAG_INACTIVE)
2047 printk(KERN_CONT " inactive");
2048 if (ctrl->flags & V4L2_CTRL_FLAG_GRABBED)
2049 printk(KERN_CONT " grabbed");
2050 if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE)
2051 printk(KERN_CONT " volatile");
2052 }
2053 printk(KERN_CONT "\n");
2054 }
2055
2056 /* Log all controls owned by the handler */
2057 void v4l2_ctrl_handler_log_status(struct v4l2_ctrl_handler *hdl,
2058 const char *prefix)
2059 {
2060 struct v4l2_ctrl *ctrl;
2061 const char *colon = "";
2062 int len;
2063
2064 if (hdl == NULL)
2065 return;
2066 if (prefix == NULL)
2067 prefix = "";
2068 len = strlen(prefix);
2069 if (len && prefix[len - 1] != ' ')
2070 colon = ": ";
2071 mutex_lock(hdl->lock);
2072 list_for_each_entry(ctrl, &hdl->ctrls, node)
2073 if (!(ctrl->flags & V4L2_CTRL_FLAG_DISABLED))
2074 log_ctrl(ctrl, prefix, colon);
2075 mutex_unlock(hdl->lock);
2076 }
2077 EXPORT_SYMBOL(v4l2_ctrl_handler_log_status);
2078
2079 int v4l2_ctrl_subdev_log_status(struct v4l2_subdev *sd)
2080 {
2081 v4l2_ctrl_handler_log_status(sd->ctrl_handler, sd->name);
2082 return 0;
2083 }
2084 EXPORT_SYMBOL(v4l2_ctrl_subdev_log_status);
2085
2086 /* Call s_ctrl for all controls owned by the handler */
2087 int v4l2_ctrl_handler_setup(struct v4l2_ctrl_handler *hdl)
2088 {
2089 struct v4l2_ctrl *ctrl;
2090 int ret = 0;
2091
2092 if (hdl == NULL)
2093 return 0;
2094 mutex_lock(hdl->lock);
2095 list_for_each_entry(ctrl, &hdl->ctrls, node)
2096 ctrl->done = false;
2097
2098 list_for_each_entry(ctrl, &hdl->ctrls, node) {
2099 struct v4l2_ctrl *master = ctrl->cluster[0];
2100 int i;
2101
2102 /* Skip if this control was already handled by a cluster. */
2103 /* Skip button controls and read-only controls. */
2104 if (ctrl->done || ctrl->type == V4L2_CTRL_TYPE_BUTTON ||
2105 (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY))
2106 continue;
2107
2108 for (i = 0; i < master->ncontrols; i++) {
2109 if (master->cluster[i]) {
2110 cur_to_new(master->cluster[i]);
2111 master->cluster[i]->is_new = 1;
2112 master->cluster[i]->done = true;
2113 }
2114 }
2115 ret = call_op(master, s_ctrl);
2116 if (ret)
2117 break;
2118 }
2119 mutex_unlock(hdl->lock);
2120 return ret;
2121 }
2122 EXPORT_SYMBOL(v4l2_ctrl_handler_setup);
2123
2124 /* Implement VIDIOC_QUERYCTRL */
2125 int v4l2_queryctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_queryctrl *qc)
2126 {
2127 u32 id = qc->id & V4L2_CTRL_ID_MASK;
2128 struct v4l2_ctrl_ref *ref;
2129 struct v4l2_ctrl *ctrl;
2130
2131 if (hdl == NULL)
2132 return -EINVAL;
2133
2134 mutex_lock(hdl->lock);
2135
2136 /* Try to find it */
2137 ref = find_ref(hdl, id);
2138
2139 if ((qc->id & V4L2_CTRL_FLAG_NEXT_CTRL) && !list_empty(&hdl->ctrl_refs)) {
2140 /* Find the next control with ID > qc->id */
2141
2142 /* Did we reach the end of the control list? */
2143 if (id >= node2id(hdl->ctrl_refs.prev)) {
2144 ref = NULL; /* Yes, so there is no next control */
2145 } else if (ref) {
2146 /* We found a control with the given ID, so just get
2147 the next one in the list. */
2148 ref = list_entry(ref->node.next, typeof(*ref), node);
2149 } else {
2150 /* No control with the given ID exists, so start
2151 searching for the next largest ID. We know there
2152 is one, otherwise the first 'if' above would have
2153 been true. */
2154 list_for_each_entry(ref, &hdl->ctrl_refs, node)
2155 if (id < ref->ctrl->id)
2156 break;
2157 }
2158 }
2159 mutex_unlock(hdl->lock);
2160 if (!ref)
2161 return -EINVAL;
2162
2163 ctrl = ref->ctrl;
2164 memset(qc, 0, sizeof(*qc));
2165 if (id >= V4L2_CID_PRIVATE_BASE)
2166 qc->id = id;
2167 else
2168 qc->id = ctrl->id;
2169 strlcpy(qc->name, ctrl->name, sizeof(qc->name));
2170 qc->minimum = ctrl->minimum;
2171 qc->maximum = ctrl->maximum;
2172 qc->default_value = ctrl->default_value;
2173 if (ctrl->type == V4L2_CTRL_TYPE_MENU
2174 || ctrl->type == V4L2_CTRL_TYPE_INTEGER_MENU)
2175 qc->step = 1;
2176 else
2177 qc->step = ctrl->step;
2178 qc->flags = ctrl->flags;
2179 qc->type = ctrl->type;
2180 return 0;
2181 }
2182 EXPORT_SYMBOL(v4l2_queryctrl);
2183
2184 int v4l2_subdev_queryctrl(struct v4l2_subdev *sd, struct v4l2_queryctrl *qc)
2185 {
2186 if (qc->id & V4L2_CTRL_FLAG_NEXT_CTRL)
2187 return -EINVAL;
2188 return v4l2_queryctrl(sd->ctrl_handler, qc);
2189 }
2190 EXPORT_SYMBOL(v4l2_subdev_queryctrl);
2191
2192 /* Implement VIDIOC_QUERYMENU */
2193 int v4l2_querymenu(struct v4l2_ctrl_handler *hdl, struct v4l2_querymenu *qm)
2194 {
2195 struct v4l2_ctrl *ctrl;
2196 u32 i = qm->index;
2197
2198 ctrl = v4l2_ctrl_find(hdl, qm->id);
2199 if (!ctrl)
2200 return -EINVAL;
2201
2202 qm->reserved = 0;
2203 /* Sanity checks */
2204 switch (ctrl->type) {
2205 case V4L2_CTRL_TYPE_MENU:
2206 if (ctrl->qmenu == NULL)
2207 return -EINVAL;
2208 break;
2209 case V4L2_CTRL_TYPE_INTEGER_MENU:
2210 if (ctrl->qmenu_int == NULL)
2211 return -EINVAL;
2212 break;
2213 default:
2214 return -EINVAL;
2215 }
2216
2217 if (i < ctrl->minimum || i > ctrl->maximum)
2218 return -EINVAL;
2219
2220 /* Use mask to see if this menu item should be skipped */
2221 if (ctrl->menu_skip_mask & (1 << i))
2222 return -EINVAL;
2223 /* Empty menu items should also be skipped */
2224 if (ctrl->type == V4L2_CTRL_TYPE_MENU) {
2225 if (ctrl->qmenu[i] == NULL || ctrl->qmenu[i][0] == '\0')
2226 return -EINVAL;
2227 strlcpy(qm->name, ctrl->qmenu[i], sizeof(qm->name));
2228 } else {
2229 qm->value = ctrl->qmenu_int[i];
2230 }
2231 return 0;
2232 }
2233 EXPORT_SYMBOL(v4l2_querymenu);
2234
2235 int v4l2_subdev_querymenu(struct v4l2_subdev *sd, struct v4l2_querymenu *qm)
2236 {
2237 return v4l2_querymenu(sd->ctrl_handler, qm);
2238 }
2239 EXPORT_SYMBOL(v4l2_subdev_querymenu);
2240
2241
2242
2243 /* Some general notes on the atomic requirements of VIDIOC_G/TRY/S_EXT_CTRLS:
2244
2245 It is not a fully atomic operation, just best-effort only. After all, if
2246 multiple controls have to be set through multiple i2c writes (for example)
2247 then some initial writes may succeed while others fail. Thus leaving the
2248 system in an inconsistent state. The question is how much effort you are
2249 willing to spend on trying to make something atomic that really isn't.
2250
2251 From the point of view of an application the main requirement is that
2252 when you call VIDIOC_S_EXT_CTRLS and some values are invalid then an
2253 error should be returned without actually affecting any controls.
2254
2255 If all the values are correct, then it is acceptable to just give up
2256 in case of low-level errors.
2257
2258 It is important though that the application can tell when only a partial
2259 configuration was done. The way we do that is through the error_idx field
2260 of struct v4l2_ext_controls: if that is equal to the count field then no
2261 controls were affected. Otherwise all controls before that index were
2262 successful in performing their 'get' or 'set' operation, the control at
2263 the given index failed, and you don't know what happened with the controls
2264 after the failed one. Since if they were part of a control cluster they
2265 could have been successfully processed (if a cluster member was encountered
2266 at index < error_idx), they could have failed (if a cluster member was at
2267 error_idx), or they may not have been processed yet (if the first cluster
2268 member appeared after error_idx).
2269
2270 It is all fairly theoretical, though. In practice all you can do is to
2271 bail out. If error_idx == count, then it is an application bug. If
2272 error_idx < count then it is only an application bug if the error code was
2273 EBUSY. That usually means that something started streaming just when you
2274 tried to set the controls. In all other cases it is a driver/hardware
2275 problem and all you can do is to retry or bail out.
2276
2277 Note that these rules do not apply to VIDIOC_TRY_EXT_CTRLS: since that
2278 never modifies controls the error_idx is just set to whatever control
2279 has an invalid value.
2280 */
2281
2282 /* Prepare for the extended g/s/try functions.
2283 Find the controls in the control array and do some basic checks. */
2284 static int prepare_ext_ctrls(struct v4l2_ctrl_handler *hdl,
2285 struct v4l2_ext_controls *cs,
2286 struct v4l2_ctrl_helper *helpers)
2287 {
2288 struct v4l2_ctrl_helper *h;
2289 bool have_clusters = false;
2290 u32 i;
2291
2292 for (i = 0, h = helpers; i < cs->count; i++, h++) {
2293 struct v4l2_ext_control *c = &cs->controls[i];
2294 struct v4l2_ctrl_ref *ref;
2295 struct v4l2_ctrl *ctrl;
2296 u32 id = c->id & V4L2_CTRL_ID_MASK;
2297
2298 cs->error_idx = i;
2299
2300 if (cs->ctrl_class && V4L2_CTRL_ID2CLASS(id) != cs->ctrl_class)
2301 return -EINVAL;
2302
2303 /* Old-style private controls are not allowed for
2304 extended controls */
2305 if (id >= V4L2_CID_PRIVATE_BASE)
2306 return -EINVAL;
2307 ref = find_ref_lock(hdl, id);
2308 if (ref == NULL)
2309 return -EINVAL;
2310 ctrl = ref->ctrl;
2311 if (ctrl->flags & V4L2_CTRL_FLAG_DISABLED)
2312 return -EINVAL;
2313
2314 if (ctrl->cluster[0]->ncontrols > 1)
2315 have_clusters = true;
2316 if (ctrl->cluster[0] != ctrl)
2317 ref = find_ref_lock(hdl, ctrl->cluster[0]->id);
2318 /* Store the ref to the master control of the cluster */
2319 h->mref = ref;
2320 h->ctrl = ctrl;
2321 /* Initially set next to 0, meaning that there is no other
2322 control in this helper array belonging to the same
2323 cluster */
2324 h->next = 0;
2325 }
2326
2327 /* We are done if there were no controls that belong to a multi-
2328 control cluster. */
2329 if (!have_clusters)
2330 return 0;
2331
2332 /* The code below figures out in O(n) time which controls in the list
2333 belong to the same cluster. */
2334
2335 /* This has to be done with the handler lock taken. */
2336 mutex_lock(hdl->lock);
2337
2338 /* First zero the helper field in the master control references */
2339 for (i = 0; i < cs->count; i++)
2340 helpers[i].mref->helper = NULL;
2341 for (i = 0, h = helpers; i < cs->count; i++, h++) {
2342 struct v4l2_ctrl_ref *mref = h->mref;
2343
2344 /* If the mref->helper is set, then it points to an earlier
2345 helper that belongs to the same cluster. */
2346 if (mref->helper) {
2347 /* Set the next field of mref->helper to the current
2348 index: this means that that earlier helper now
2349 points to the next helper in the same cluster. */
2350 mref->helper->next = i;
2351 /* mref should be set only for the first helper in the
2352 cluster, clear the others. */
2353 h->mref = NULL;
2354 }
2355 /* Point the mref helper to the current helper struct. */
2356 mref->helper = h;
2357 }
2358 mutex_unlock(hdl->lock);
2359 return 0;
2360 }
2361
2362 /* Handles the corner case where cs->count == 0. It checks whether the
2363 specified control class exists. If that class ID is 0, then it checks
2364 whether there are any controls at all. */
2365 static int class_check(struct v4l2_ctrl_handler *hdl, u32 ctrl_class)
2366 {
2367 if (ctrl_class == 0)
2368 return list_empty(&hdl->ctrl_refs) ? -EINVAL : 0;
2369 return find_ref_lock(hdl, ctrl_class | 1) ? 0 : -EINVAL;
2370 }
2371
2372
2373
2374 /* Get extended controls. Allocates the helpers array if needed. */
2375 int v4l2_g_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *cs)
2376 {
2377 struct v4l2_ctrl_helper helper[4];
2378 struct v4l2_ctrl_helper *helpers = helper;
2379 int ret;
2380 int i, j;
2381
2382 cs->error_idx = cs->count;
2383 cs->ctrl_class = V4L2_CTRL_ID2CLASS(cs->ctrl_class);
2384
2385 if (hdl == NULL)
2386 return -EINVAL;
2387
2388 if (cs->count == 0)
2389 return class_check(hdl, cs->ctrl_class);
2390
2391 if (cs->count > ARRAY_SIZE(helper)) {
2392 helpers = kmalloc_array(cs->count, sizeof(helper[0]),
2393 GFP_KERNEL);
2394 if (helpers == NULL)
2395 return -ENOMEM;
2396 }
2397
2398 ret = prepare_ext_ctrls(hdl, cs, helpers);
2399 cs->error_idx = cs->count;
2400
2401 for (i = 0; !ret && i < cs->count; i++)
2402 if (helpers[i].ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY)
2403 ret = -EACCES;
2404
2405 for (i = 0; !ret && i < cs->count; i++) {
2406 int (*ctrl_to_user)(struct v4l2_ext_control *c,
2407 struct v4l2_ctrl *ctrl) = cur_to_user;
2408 struct v4l2_ctrl *master;
2409
2410 if (helpers[i].mref == NULL)
2411 continue;
2412
2413 master = helpers[i].mref->ctrl;
2414 cs->error_idx = i;
2415
2416 v4l2_ctrl_lock(master);
2417
2418 /* g_volatile_ctrl will update the new control values */
2419 if ((master->flags & V4L2_CTRL_FLAG_VOLATILE) ||
2420 (master->has_volatiles && !is_cur_manual(master))) {
2421 for (j = 0; j < master->ncontrols; j++)
2422 cur_to_new(master->cluster[j]);
2423 ret = call_op(master, g_volatile_ctrl);
2424 ctrl_to_user = new_to_user;
2425 }
2426 /* If OK, then copy the current (for non-volatile controls)
2427 or the new (for volatile controls) control values to the
2428 caller */
2429 if (!ret) {
2430 u32 idx = i;
2431
2432 do {
2433 ret = ctrl_to_user(cs->controls + idx,
2434 helpers[idx].ctrl);
2435 idx = helpers[idx].next;
2436 } while (!ret && idx);
2437 }
2438 v4l2_ctrl_unlock(master);
2439 }
2440
2441 if (cs->count > ARRAY_SIZE(helper))
2442 kfree(helpers);
2443 return ret;
2444 }
2445 EXPORT_SYMBOL(v4l2_g_ext_ctrls);
2446
2447 int v4l2_subdev_g_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs)
2448 {
2449 return v4l2_g_ext_ctrls(sd->ctrl_handler, cs);
2450 }
2451 EXPORT_SYMBOL(v4l2_subdev_g_ext_ctrls);
2452
2453 /* Helper function to get a single control */
2454 static int get_ctrl(struct v4l2_ctrl *ctrl, struct v4l2_ext_control *c)
2455 {
2456 struct v4l2_ctrl *master = ctrl->cluster[0];
2457 int ret = 0;
2458 int i;
2459
2460 /* String controls are not supported. The new_to_user() and
2461 * cur_to_user() calls below would need to be modified not to access
2462 * userspace memory when called from get_ctrl().
2463 */
2464 if (ctrl->type == V4L2_CTRL_TYPE_STRING)
2465 return -EINVAL;
2466
2467 if (ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY)
2468 return -EACCES;
2469
2470 v4l2_ctrl_lock(master);
2471 /* g_volatile_ctrl will update the current control values */
2472 if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE) {
2473 for (i = 0; i < master->ncontrols; i++)
2474 cur_to_new(master->cluster[i]);
2475 ret = call_op(master, g_volatile_ctrl);
2476 new_to_user(c, ctrl);
2477 } else {
2478 cur_to_user(c, ctrl);
2479 }
2480 v4l2_ctrl_unlock(master);
2481 return ret;
2482 }
2483
2484 int v4l2_g_ctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_control *control)
2485 {
2486 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, control->id);
2487 struct v4l2_ext_control c;
2488 int ret;
2489
2490 if (ctrl == NULL || !type_is_int(ctrl))
2491 return -EINVAL;
2492 ret = get_ctrl(ctrl, &c);
2493 control->value = c.value;
2494 return ret;
2495 }
2496 EXPORT_SYMBOL(v4l2_g_ctrl);
2497
2498 int v4l2_subdev_g_ctrl(struct v4l2_subdev *sd, struct v4l2_control *control)
2499 {
2500 return v4l2_g_ctrl(sd->ctrl_handler, control);
2501 }
2502 EXPORT_SYMBOL(v4l2_subdev_g_ctrl);
2503
2504 s32 v4l2_ctrl_g_ctrl(struct v4l2_ctrl *ctrl)
2505 {
2506 struct v4l2_ext_control c;
2507
2508 /* It's a driver bug if this happens. */
2509 WARN_ON(!type_is_int(ctrl));
2510 c.value = 0;
2511 get_ctrl(ctrl, &c);
2512 return c.value;
2513 }
2514 EXPORT_SYMBOL(v4l2_ctrl_g_ctrl);
2515
2516 s64 v4l2_ctrl_g_ctrl_int64(struct v4l2_ctrl *ctrl)
2517 {
2518 struct v4l2_ext_control c;
2519
2520 /* It's a driver bug if this happens. */
2521 WARN_ON(ctrl->type != V4L2_CTRL_TYPE_INTEGER64);
2522 c.value = 0;
2523 get_ctrl(ctrl, &c);
2524 return c.value;
2525 }
2526 EXPORT_SYMBOL(v4l2_ctrl_g_ctrl_int64);
2527
2528
2529 /* Core function that calls try/s_ctrl and ensures that the new value is
2530 copied to the current value on a set.
2531 Must be called with ctrl->handler->lock held. */
2532 static int try_or_set_cluster(struct v4l2_fh *fh, struct v4l2_ctrl *master,
2533 bool set, u32 ch_flags)
2534 {
2535 bool update_flag;
2536 int ret;
2537 int i;
2538
2539 /* Go through the cluster and either validate the new value or
2540 (if no new value was set), copy the current value to the new
2541 value, ensuring a consistent view for the control ops when
2542 called. */
2543 for (i = 0; i < master->ncontrols; i++) {
2544 struct v4l2_ctrl *ctrl = master->cluster[i];
2545
2546 if (ctrl == NULL)
2547 continue;
2548
2549 if (!ctrl->is_new) {
2550 cur_to_new(ctrl);
2551 continue;
2552 }
2553 /* Check again: it may have changed since the
2554 previous check in try_or_set_ext_ctrls(). */
2555 if (set && (ctrl->flags & V4L2_CTRL_FLAG_GRABBED))
2556 return -EBUSY;
2557 }
2558
2559 ret = call_op(master, try_ctrl);
2560
2561 /* Don't set if there is no change */
2562 if (ret || !set || !cluster_changed(master))
2563 return ret;
2564 ret = call_op(master, s_ctrl);
2565 if (ret)
2566 return ret;
2567
2568 /* If OK, then make the new values permanent. */
2569 update_flag = is_cur_manual(master) != is_new_manual(master);
2570 for (i = 0; i < master->ncontrols; i++)
2571 new_to_cur(fh, master->cluster[i], ch_flags |
2572 ((update_flag && i > 0) ? V4L2_EVENT_CTRL_CH_FLAGS : 0));
2573 return 0;
2574 }
2575
2576 /* Validate controls. */
2577 static int validate_ctrls(struct v4l2_ext_controls *cs,
2578 struct v4l2_ctrl_helper *helpers, bool set)
2579 {
2580 unsigned i;
2581 int ret = 0;
2582
2583 cs->error_idx = cs->count;
2584 for (i = 0; i < cs->count; i++) {
2585 struct v4l2_ctrl *ctrl = helpers[i].ctrl;
2586
2587 cs->error_idx = i;
2588
2589 if (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY)
2590 return -EACCES;
2591 /* This test is also done in try_set_control_cluster() which
2592 is called in atomic context, so that has the final say,
2593 but it makes sense to do an up-front check as well. Once
2594 an error occurs in try_set_control_cluster() some other
2595 controls may have been set already and we want to do a
2596 best-effort to avoid that. */
2597 if (set && (ctrl->flags & V4L2_CTRL_FLAG_GRABBED))
2598 return -EBUSY;
2599 ret = validate_new(ctrl, &cs->controls[i]);
2600 if (ret)
2601 return ret;
2602 }
2603 return 0;
2604 }
2605
2606 /* Obtain the current volatile values of an autocluster and mark them
2607 as new. */
2608 static void update_from_auto_cluster(struct v4l2_ctrl *master)
2609 {
2610 int i;
2611
2612 for (i = 0; i < master->ncontrols; i++)
2613 cur_to_new(master->cluster[i]);
2614 if (!call_op(master, g_volatile_ctrl))
2615 for (i = 1; i < master->ncontrols; i++)
2616 if (master->cluster[i])
2617 master->cluster[i]->is_new = 1;
2618 }
2619
2620 /* Try or try-and-set controls */
2621 static int try_set_ext_ctrls(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
2622 struct v4l2_ext_controls *cs,
2623 bool set)
2624 {
2625 struct v4l2_ctrl_helper helper[4];
2626 struct v4l2_ctrl_helper *helpers = helper;
2627 unsigned i, j;
2628 int ret;
2629
2630 cs->error_idx = cs->count;
2631 cs->ctrl_class = V4L2_CTRL_ID2CLASS(cs->ctrl_class);
2632
2633 if (hdl == NULL)
2634 return -EINVAL;
2635
2636 if (cs->count == 0)
2637 return class_check(hdl, cs->ctrl_class);
2638
2639 if (cs->count > ARRAY_SIZE(helper)) {
2640 helpers = kmalloc_array(cs->count, sizeof(helper[0]),
2641 GFP_KERNEL);
2642 if (!helpers)
2643 return -ENOMEM;
2644 }
2645 ret = prepare_ext_ctrls(hdl, cs, helpers);
2646 if (!ret)
2647 ret = validate_ctrls(cs, helpers, set);
2648 if (ret && set)
2649 cs->error_idx = cs->count;
2650 for (i = 0; !ret && i < cs->count; i++) {
2651 struct v4l2_ctrl *master;
2652 u32 idx = i;
2653
2654 if (helpers[i].mref == NULL)
2655 continue;
2656
2657 cs->error_idx = i;
2658 master = helpers[i].mref->ctrl;
2659 v4l2_ctrl_lock(master);
2660
2661 /* Reset the 'is_new' flags of the cluster */
2662 for (j = 0; j < master->ncontrols; j++)
2663 if (master->cluster[j])
2664 master->cluster[j]->is_new = 0;
2665
2666 /* For volatile autoclusters that are currently in auto mode
2667 we need to discover if it will be set to manual mode.
2668 If so, then we have to copy the current volatile values
2669 first since those will become the new manual values (which
2670 may be overwritten by explicit new values from this set
2671 of controls). */
2672 if (master->is_auto && master->has_volatiles &&
2673 !is_cur_manual(master)) {
2674 /* Pick an initial non-manual value */
2675 s32 new_auto_val = master->manual_mode_value + 1;
2676 u32 tmp_idx = idx;
2677
2678 do {
2679 /* Check if the auto control is part of the
2680 list, and remember the new value. */
2681 if (helpers[tmp_idx].ctrl == master)
2682 new_auto_val = cs->controls[tmp_idx].value;
2683 tmp_idx = helpers[tmp_idx].next;
2684 } while (tmp_idx);
2685 /* If the new value == the manual value, then copy
2686 the current volatile values. */
2687 if (new_auto_val == master->manual_mode_value)
2688 update_from_auto_cluster(master);
2689 }
2690
2691 /* Copy the new caller-supplied control values.
2692 user_to_new() sets 'is_new' to 1. */
2693 do {
2694 ret = user_to_new(cs->controls + idx, helpers[idx].ctrl);
2695 idx = helpers[idx].next;
2696 } while (!ret && idx);
2697
2698 if (!ret)
2699 ret = try_or_set_cluster(fh, master, set, 0);
2700
2701 /* Copy the new values back to userspace. */
2702 if (!ret) {
2703 idx = i;
2704 do {
2705 ret = new_to_user(cs->controls + idx,
2706 helpers[idx].ctrl);
2707 idx = helpers[idx].next;
2708 } while (!ret && idx);
2709 }
2710 v4l2_ctrl_unlock(master);
2711 }
2712
2713 if (cs->count > ARRAY_SIZE(helper))
2714 kfree(helpers);
2715 return ret;
2716 }
2717
2718 int v4l2_try_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *cs)
2719 {
2720 return try_set_ext_ctrls(NULL, hdl, cs, false);
2721 }
2722 EXPORT_SYMBOL(v4l2_try_ext_ctrls);
2723
2724 int v4l2_s_ext_ctrls(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
2725 struct v4l2_ext_controls *cs)
2726 {
2727 return try_set_ext_ctrls(fh, hdl, cs, true);
2728 }
2729 EXPORT_SYMBOL(v4l2_s_ext_ctrls);
2730
2731 int v4l2_subdev_try_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs)
2732 {
2733 return try_set_ext_ctrls(NULL, sd->ctrl_handler, cs, false);
2734 }
2735 EXPORT_SYMBOL(v4l2_subdev_try_ext_ctrls);
2736
2737 int v4l2_subdev_s_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs)
2738 {
2739 return try_set_ext_ctrls(NULL, sd->ctrl_handler, cs, true);
2740 }
2741 EXPORT_SYMBOL(v4l2_subdev_s_ext_ctrls);
2742
2743 /* Helper function for VIDIOC_S_CTRL compatibility */
2744 static int set_ctrl(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl,
2745 struct v4l2_ext_control *c, u32 ch_flags)
2746 {
2747 struct v4l2_ctrl *master = ctrl->cluster[0];
2748 int i;
2749
2750 /* String controls are not supported. The user_to_new() and
2751 * cur_to_user() calls below would need to be modified not to access
2752 * userspace memory when called from set_ctrl().
2753 */
2754 if (ctrl->type == V4L2_CTRL_TYPE_STRING)
2755 return -EINVAL;
2756
2757 /* Reset the 'is_new' flags of the cluster */
2758 for (i = 0; i < master->ncontrols; i++)
2759 if (master->cluster[i])
2760 master->cluster[i]->is_new = 0;
2761
2762 /* For autoclusters with volatiles that are switched from auto to
2763 manual mode we have to update the current volatile values since
2764 those will become the initial manual values after such a switch. */
2765 if (master->is_auto && master->has_volatiles && ctrl == master &&
2766 !is_cur_manual(master) && c->value == master->manual_mode_value)
2767 update_from_auto_cluster(master);
2768
2769 user_to_new(c, ctrl);
2770 return try_or_set_cluster(fh, master, true, ch_flags);
2771 }
2772
2773 /* Helper function for VIDIOC_S_CTRL compatibility */
2774 static int set_ctrl_lock(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl,
2775 struct v4l2_ext_control *c)
2776 {
2777 int ret = validate_new(ctrl, c);
2778
2779 if (!ret) {
2780 v4l2_ctrl_lock(ctrl);
2781 ret = set_ctrl(fh, ctrl, c, 0);
2782 if (!ret)
2783 cur_to_user(c, ctrl);
2784 v4l2_ctrl_unlock(ctrl);
2785 }
2786 return ret;
2787 }
2788
2789 int v4l2_s_ctrl(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
2790 struct v4l2_control *control)
2791 {
2792 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, control->id);
2793 struct v4l2_ext_control c;
2794 int ret;
2795
2796 if (ctrl == NULL || !type_is_int(ctrl))
2797 return -EINVAL;
2798
2799 if (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY)
2800 return -EACCES;
2801
2802 c.value = control->value;
2803 ret = set_ctrl_lock(fh, ctrl, &c);
2804 control->value = c.value;
2805 return ret;
2806 }
2807 EXPORT_SYMBOL(v4l2_s_ctrl);
2808
2809 int v4l2_subdev_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *control)
2810 {
2811 return v4l2_s_ctrl(NULL, sd->ctrl_handler, control);
2812 }
2813 EXPORT_SYMBOL(v4l2_subdev_s_ctrl);
2814
2815 int v4l2_ctrl_s_ctrl(struct v4l2_ctrl *ctrl, s32 val)
2816 {
2817 struct v4l2_ext_control c;
2818
2819 /* It's a driver bug if this happens. */
2820 WARN_ON(!type_is_int(ctrl));
2821 c.value = val;
2822 return set_ctrl_lock(NULL, ctrl, &c);
2823 }
2824 EXPORT_SYMBOL(v4l2_ctrl_s_ctrl);
2825
2826 int v4l2_ctrl_s_ctrl_int64(struct v4l2_ctrl *ctrl, s64 val)
2827 {
2828 struct v4l2_ext_control c;
2829
2830 /* It's a driver bug if this happens. */
2831 WARN_ON(ctrl->type != V4L2_CTRL_TYPE_INTEGER64);
2832 c.value64 = val;
2833 return set_ctrl_lock(NULL, ctrl, &c);
2834 }
2835 EXPORT_SYMBOL(v4l2_ctrl_s_ctrl_int64);
2836
2837 void v4l2_ctrl_notify(struct v4l2_ctrl *ctrl, v4l2_ctrl_notify_fnc notify, void *priv)
2838 {
2839 if (ctrl == NULL)
2840 return;
2841 if (notify == NULL) {
2842 ctrl->call_notify = 0;
2843 return;
2844 }
2845 if (WARN_ON(ctrl->handler->notify && ctrl->handler->notify != notify))
2846 return;
2847 ctrl->handler->notify = notify;
2848 ctrl->handler->notify_priv = priv;
2849 ctrl->call_notify = 1;
2850 }
2851 EXPORT_SYMBOL(v4l2_ctrl_notify);
2852
2853 int v4l2_ctrl_modify_range(struct v4l2_ctrl *ctrl,
2854 s32 min, s32 max, u32 step, s32 def)
2855 {
2856 int ret = check_range(ctrl->type, min, max, step, def);
2857 struct v4l2_ext_control c;
2858
2859 switch (ctrl->type) {
2860 case V4L2_CTRL_TYPE_INTEGER:
2861 case V4L2_CTRL_TYPE_BOOLEAN:
2862 case V4L2_CTRL_TYPE_MENU:
2863 case V4L2_CTRL_TYPE_INTEGER_MENU:
2864 case V4L2_CTRL_TYPE_BITMASK:
2865 if (ret)
2866 return ret;
2867 break;
2868 default:
2869 return -EINVAL;
2870 }
2871 v4l2_ctrl_lock(ctrl);
2872 ctrl->minimum = min;
2873 ctrl->maximum = max;
2874 ctrl->step = step;
2875 ctrl->default_value = def;
2876 c.value = ctrl->cur.val;
2877 if (validate_new(ctrl, &c))
2878 c.value = def;
2879 if (c.value != ctrl->cur.val)
2880 ret = set_ctrl(NULL, ctrl, &c, V4L2_EVENT_CTRL_CH_RANGE);
2881 else
2882 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_RANGE);
2883 v4l2_ctrl_unlock(ctrl);
2884 return ret;
2885 }
2886 EXPORT_SYMBOL(v4l2_ctrl_modify_range);
2887
2888 static int v4l2_ctrl_add_event(struct v4l2_subscribed_event *sev, unsigned elems)
2889 {
2890 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(sev->fh->ctrl_handler, sev->id);
2891
2892 if (ctrl == NULL)
2893 return -EINVAL;
2894
2895 v4l2_ctrl_lock(ctrl);
2896 list_add_tail(&sev->node, &ctrl->ev_subs);
2897 if (ctrl->type != V4L2_CTRL_TYPE_CTRL_CLASS &&
2898 (sev->flags & V4L2_EVENT_SUB_FL_SEND_INITIAL)) {
2899 struct v4l2_event ev;
2900 u32 changes = V4L2_EVENT_CTRL_CH_FLAGS;
2901
2902 if (!(ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY))
2903 changes |= V4L2_EVENT_CTRL_CH_VALUE;
2904 fill_event(&ev, ctrl, changes);
2905 /* Mark the queue as active, allowing this initial
2906 event to be accepted. */
2907 sev->elems = elems;
2908 v4l2_event_queue_fh(sev->fh, &ev);
2909 }
2910 v4l2_ctrl_unlock(ctrl);
2911 return 0;
2912 }
2913
2914 static void v4l2_ctrl_del_event(struct v4l2_subscribed_event *sev)
2915 {
2916 struct v4l2_ctrl *ctrl = v4l2_ctrl_find(sev->fh->ctrl_handler, sev->id);
2917
2918 v4l2_ctrl_lock(ctrl);
2919 list_del(&sev->node);
2920 v4l2_ctrl_unlock(ctrl);
2921 }
2922
2923 void v4l2_ctrl_replace(struct v4l2_event *old, const struct v4l2_event *new)
2924 {
2925 u32 old_changes = old->u.ctrl.changes;
2926
2927 old->u.ctrl = new->u.ctrl;
2928 old->u.ctrl.changes |= old_changes;
2929 }
2930 EXPORT_SYMBOL(v4l2_ctrl_replace);
2931
2932 void v4l2_ctrl_merge(const struct v4l2_event *old, struct v4l2_event *new)
2933 {
2934 new->u.ctrl.changes |= old->u.ctrl.changes;
2935 }
2936 EXPORT_SYMBOL(v4l2_ctrl_merge);
2937
2938 const struct v4l2_subscribed_event_ops v4l2_ctrl_sub_ev_ops = {
2939 .add = v4l2_ctrl_add_event,
2940 .del = v4l2_ctrl_del_event,
2941 .replace = v4l2_ctrl_replace,
2942 .merge = v4l2_ctrl_merge,
2943 };
2944 EXPORT_SYMBOL(v4l2_ctrl_sub_ev_ops);
2945
2946 int v4l2_ctrl_log_status(struct file *file, void *fh)
2947 {
2948 struct video_device *vfd = video_devdata(file);
2949 struct v4l2_fh *vfh = file->private_data;
2950
2951 if (test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags) && vfd->v4l2_dev)
2952 v4l2_ctrl_handler_log_status(vfh->ctrl_handler,
2953 vfd->v4l2_dev->name);
2954 return 0;
2955 }
2956 EXPORT_SYMBOL(v4l2_ctrl_log_status);
2957
2958 int v4l2_ctrl_subscribe_event(struct v4l2_fh *fh,
2959 const struct v4l2_event_subscription *sub)
2960 {
2961 if (sub->type == V4L2_EVENT_CTRL)
2962 return v4l2_event_subscribe(fh, sub, 0, &v4l2_ctrl_sub_ev_ops);
2963 return -EINVAL;
2964 }
2965 EXPORT_SYMBOL(v4l2_ctrl_subscribe_event);
2966
2967 int v4l2_ctrl_subdev_subscribe_event(struct v4l2_subdev *sd, struct v4l2_fh *fh,
2968 struct v4l2_event_subscription *sub)
2969 {
2970 if (!sd->ctrl_handler)
2971 return -EINVAL;
2972 return v4l2_ctrl_subscribe_event(fh, sub);
2973 }
2974 EXPORT_SYMBOL(v4l2_ctrl_subdev_subscribe_event);
2975
2976 unsigned int v4l2_ctrl_poll(struct file *file, struct poll_table_struct *wait)
2977 {
2978 struct v4l2_fh *fh = file->private_data;
2979
2980 if (v4l2_event_pending(fh))
2981 return POLLPRI;
2982 poll_wait(file, &fh->wait, wait);
2983 return 0;
2984 }
2985 EXPORT_SYMBOL(v4l2_ctrl_poll);
Linux with added FPC-III support