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v4l2-ctrls.c
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1 /*
2  V4L2 controls framework implementation.
3 
4  Copyright (C) 2010 Hans Verkuil <[email protected]>
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  NULL
238  };
239  static const char * const camera_auto_focus_range[] = {
240  "Auto",
241  "Normal",
242  "Macro",
243  "Infinity",
244  NULL
245  };
246  static const char * const colorfx[] = {
247  "None",
248  "Black & White",
249  "Sepia",
250  "Negative",
251  "Emboss",
252  "Sketch",
253  "Sky Blue",
254  "Grass Green",
255  "Skin Whiten",
256  "Vivid",
257  "Aqua",
258  "Art Freeze",
259  "Silhouette",
260  "Solarization",
261  "Antique",
262  "Set Cb/Cr",
263  NULL
264  };
265  static const char * const auto_n_preset_white_balance[] = {
266  "Manual",
267  "Auto",
268  "Incandescent",
269  "Fluorescent",
270  "Fluorescent H",
271  "Horizon",
272  "Daylight",
273  "Flash",
274  "Cloudy",
275  "Shade",
276  NULL,
277  };
278  static const char * const camera_iso_sensitivity_auto[] = {
279  "Manual",
280  "Auto",
281  NULL
282  };
283  static const char * const scene_mode[] = {
284  "None",
285  "Backlight",
286  "Beach/Snow",
287  "Candle Light",
288  "Dusk/Dawn",
289  "Fall Colors",
290  "Fireworks",
291  "Landscape",
292  "Night",
293  "Party/Indoor",
294  "Portrait",
295  "Sports",
296  "Sunset",
297  "Text",
298  NULL
299  };
300  static const char * const tune_preemphasis[] = {
301  "No Preemphasis",
302  "50 Microseconds",
303  "75 Microseconds",
304  NULL,
305  };
306  static const char * const header_mode[] = {
307  "Separate Buffer",
308  "Joined With 1st Frame",
309  NULL,
310  };
311  static const char * const multi_slice[] = {
312  "Single",
313  "Max Macroblocks",
314  "Max Bytes",
315  NULL,
316  };
317  static const char * const entropy_mode[] = {
318  "CAVLC",
319  "CABAC",
320  NULL,
321  };
322  static const char * const mpeg_h264_level[] = {
323  "1",
324  "1b",
325  "1.1",
326  "1.2",
327  "1.3",
328  "2",
329  "2.1",
330  "2.2",
331  "3",
332  "3.1",
333  "3.2",
334  "4",
335  "4.1",
336  "4.2",
337  "5",
338  "5.1",
339  NULL,
340  };
341  static const char * const h264_loop_filter[] = {
342  "Enabled",
343  "Disabled",
344  "Disabled at Slice Boundary",
345  NULL,
346  };
347  static const char * const h264_profile[] = {
348  "Baseline",
349  "Constrained Baseline",
350  "Main",
351  "Extended",
352  "High",
353  "High 10",
354  "High 422",
355  "High 444 Predictive",
356  "High 10 Intra",
357  "High 422 Intra",
358  "High 444 Intra",
359  "CAVLC 444 Intra",
360  "Scalable Baseline",
361  "Scalable High",
362  "Scalable High Intra",
363  "Multiview High",
364  NULL,
365  };
366  static const char * const vui_sar_idc[] = {
367  "Unspecified",
368  "1:1",
369  "12:11",
370  "10:11",
371  "16:11",
372  "40:33",
373  "24:11",
374  "20:11",
375  "32:11",
376  "80:33",
377  "18:11",
378  "15:11",
379  "64:33",
380  "160:99",
381  "4:3",
382  "3:2",
383  "2:1",
384  "Extended SAR",
385  NULL,
386  };
387  static const char * const h264_fp_arrangement_type[] = {
388  "Checkerboard",
389  "Column",
390  "Row",
391  "Side by Side",
392  "Top Bottom",
393  "Temporal",
394  NULL,
395  };
396  static const char * const h264_fmo_map_type[] = {
397  "Interleaved Slices",
398  "Scattered Slices",
399  "Foreground with Leftover",
400  "Box Out",
401  "Raster Scan",
402  "Wipe Scan",
403  "Explicit",
404  NULL,
405  };
406  static const char * const mpeg_mpeg4_level[] = {
407  "0",
408  "0b",
409  "1",
410  "2",
411  "3",
412  "3b",
413  "4",
414  "5",
415  NULL,
416  };
417  static const char * const mpeg4_profile[] = {
418  "Simple",
419  "Advanced Simple",
420  "Core",
421  "Simple Scalable",
422  "Advanced Coding Efficency",
423  NULL,
424  };
425 
426  static const char * const flash_led_mode[] = {
427  "Off",
428  "Flash",
429  "Torch",
430  NULL,
431  };
432  static const char * const flash_strobe_source[] = {
433  "Software",
434  "External",
435  NULL,
436  };
437 
438  static const char * const jpeg_chroma_subsampling[] = {
439  "4:4:4",
440  "4:2:2",
441  "4:2:0",
442  "4:1:1",
443  "4:1:0",
444  "Gray",
445  NULL,
446  };
447  static const char * const dv_tx_mode[] = {
448  "DVI-D",
449  "HDMI",
450  NULL,
451  };
452  static const char * const dv_rgb_range[] = {
453  "Automatic",
454  "RGB limited range (16-235)",
455  "RGB full range (0-255)",
456  NULL,
457  };
458 
459 
460  switch (id) {
461  case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ:
462  return mpeg_audio_sampling_freq;
463  case V4L2_CID_MPEG_AUDIO_ENCODING:
464  return mpeg_audio_encoding;
465  case V4L2_CID_MPEG_AUDIO_L1_BITRATE:
466  return mpeg_audio_l1_bitrate;
467  case V4L2_CID_MPEG_AUDIO_L2_BITRATE:
468  return mpeg_audio_l2_bitrate;
469  case V4L2_CID_MPEG_AUDIO_L3_BITRATE:
470  return mpeg_audio_l3_bitrate;
471  case V4L2_CID_MPEG_AUDIO_AC3_BITRATE:
472  return mpeg_audio_ac3_bitrate;
473  case V4L2_CID_MPEG_AUDIO_MODE:
474  return mpeg_audio_mode;
475  case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION:
476  return mpeg_audio_mode_extension;
477  case V4L2_CID_MPEG_AUDIO_EMPHASIS:
478  return mpeg_audio_emphasis;
479  case V4L2_CID_MPEG_AUDIO_CRC:
480  return mpeg_audio_crc;
481  case V4L2_CID_MPEG_AUDIO_DEC_PLAYBACK:
482  case V4L2_CID_MPEG_AUDIO_DEC_MULTILINGUAL_PLAYBACK:
483  return mpeg_audio_dec_playback;
484  case V4L2_CID_MPEG_VIDEO_ENCODING:
485  return mpeg_video_encoding;
486  case V4L2_CID_MPEG_VIDEO_ASPECT:
487  return mpeg_video_aspect;
488  case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
489  return mpeg_video_bitrate_mode;
490  case V4L2_CID_MPEG_STREAM_TYPE:
491  return mpeg_stream_type;
492  case V4L2_CID_MPEG_STREAM_VBI_FMT:
493  return mpeg_stream_vbi_fmt;
494  case V4L2_CID_POWER_LINE_FREQUENCY:
495  return camera_power_line_frequency;
496  case V4L2_CID_EXPOSURE_AUTO:
497  return camera_exposure_auto;
498  case V4L2_CID_EXPOSURE_METERING:
499  return camera_exposure_metering;
500  case V4L2_CID_AUTO_FOCUS_RANGE:
501  return camera_auto_focus_range;
502  case V4L2_CID_COLORFX:
503  return colorfx;
504  case V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE:
505  return auto_n_preset_white_balance;
506  case V4L2_CID_ISO_SENSITIVITY_AUTO:
507  return camera_iso_sensitivity_auto;
508  case V4L2_CID_SCENE_MODE:
509  return scene_mode;
510  case V4L2_CID_TUNE_PREEMPHASIS:
511  return tune_preemphasis;
512  case V4L2_CID_FLASH_LED_MODE:
513  return flash_led_mode;
514  case V4L2_CID_FLASH_STROBE_SOURCE:
515  return flash_strobe_source;
516  case V4L2_CID_MPEG_VIDEO_HEADER_MODE:
517  return header_mode;
518  case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE:
519  return multi_slice;
520  case V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE:
521  return entropy_mode;
522  case V4L2_CID_MPEG_VIDEO_H264_LEVEL:
523  return mpeg_h264_level;
524  case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE:
525  return h264_loop_filter;
526  case V4L2_CID_MPEG_VIDEO_H264_PROFILE:
527  return h264_profile;
528  case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC:
529  return vui_sar_idc;
530  case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE:
531  return h264_fp_arrangement_type;
532  case V4L2_CID_MPEG_VIDEO_H264_FMO_MAP_TYPE:
533  return h264_fmo_map_type;
534  case V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL:
535  return mpeg_mpeg4_level;
536  case V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE:
537  return mpeg4_profile;
538  case V4L2_CID_JPEG_CHROMA_SUBSAMPLING:
539  return jpeg_chroma_subsampling;
540  case V4L2_CID_DV_TX_MODE:
541  return dv_tx_mode;
542  case V4L2_CID_DV_TX_RGB_RANGE:
543  case V4L2_CID_DV_RX_RGB_RANGE:
544  return dv_rgb_range;
545 
546  default:
547  return NULL;
548  }
549 }
550 EXPORT_SYMBOL(v4l2_ctrl_get_menu);
551 
552 /* Return the control name. */
553 const char *v4l2_ctrl_get_name(u32 id)
554 {
555  switch (id) {
556  /* USER controls */
557  /* Keep the order of the 'case's the same as in videodev2.h! */
558  case V4L2_CID_USER_CLASS: return "User Controls";
559  case V4L2_CID_BRIGHTNESS: return "Brightness";
560  case V4L2_CID_CONTRAST: return "Contrast";
561  case V4L2_CID_SATURATION: return "Saturation";
562  case V4L2_CID_HUE: return "Hue";
563  case V4L2_CID_AUDIO_VOLUME: return "Volume";
564  case V4L2_CID_AUDIO_BALANCE: return "Balance";
565  case V4L2_CID_AUDIO_BASS: return "Bass";
566  case V4L2_CID_AUDIO_TREBLE: return "Treble";
567  case V4L2_CID_AUDIO_MUTE: return "Mute";
568  case V4L2_CID_AUDIO_LOUDNESS: return "Loudness";
569  case V4L2_CID_BLACK_LEVEL: return "Black Level";
570  case V4L2_CID_AUTO_WHITE_BALANCE: return "White Balance, Automatic";
571  case V4L2_CID_DO_WHITE_BALANCE: return "Do White Balance";
572  case V4L2_CID_RED_BALANCE: return "Red Balance";
573  case V4L2_CID_BLUE_BALANCE: return "Blue Balance";
574  case V4L2_CID_GAMMA: return "Gamma";
575  case V4L2_CID_EXPOSURE: return "Exposure";
576  case V4L2_CID_AUTOGAIN: return "Gain, Automatic";
577  case V4L2_CID_GAIN: return "Gain";
578  case V4L2_CID_HFLIP: return "Horizontal Flip";
579  case V4L2_CID_VFLIP: return "Vertical Flip";
580  case V4L2_CID_HCENTER: return "Horizontal Center";
581  case V4L2_CID_VCENTER: return "Vertical Center";
582  case V4L2_CID_POWER_LINE_FREQUENCY: return "Power Line Frequency";
583  case V4L2_CID_HUE_AUTO: return "Hue, Automatic";
584  case V4L2_CID_WHITE_BALANCE_TEMPERATURE: return "White Balance Temperature";
585  case V4L2_CID_SHARPNESS: return "Sharpness";
586  case V4L2_CID_BACKLIGHT_COMPENSATION: return "Backlight Compensation";
587  case V4L2_CID_CHROMA_AGC: return "Chroma AGC";
588  case V4L2_CID_COLOR_KILLER: return "Color Killer";
589  case V4L2_CID_COLORFX: return "Color Effects";
590  case V4L2_CID_AUTOBRIGHTNESS: return "Brightness, Automatic";
591  case V4L2_CID_BAND_STOP_FILTER: return "Band-Stop Filter";
592  case V4L2_CID_ROTATE: return "Rotate";
593  case V4L2_CID_BG_COLOR: return "Background Color";
594  case V4L2_CID_CHROMA_GAIN: return "Chroma Gain";
595  case V4L2_CID_ILLUMINATORS_1: return "Illuminator 1";
596  case V4L2_CID_ILLUMINATORS_2: return "Illuminator 2";
597  case V4L2_CID_MIN_BUFFERS_FOR_CAPTURE: return "Min Number of Capture Buffers";
598  case V4L2_CID_MIN_BUFFERS_FOR_OUTPUT: return "Min Number of Output Buffers";
599  case V4L2_CID_ALPHA_COMPONENT: return "Alpha Component";
600  case V4L2_CID_COLORFX_CBCR: return "Color Effects, CbCr";
601 
602  /* MPEG controls */
603  /* Keep the order of the 'case's the same as in videodev2.h! */
604  case V4L2_CID_MPEG_CLASS: return "MPEG Encoder Controls";
605  case V4L2_CID_MPEG_STREAM_TYPE: return "Stream Type";
606  case V4L2_CID_MPEG_STREAM_PID_PMT: return "Stream PMT Program ID";
607  case V4L2_CID_MPEG_STREAM_PID_AUDIO: return "Stream Audio Program ID";
608  case V4L2_CID_MPEG_STREAM_PID_VIDEO: return "Stream Video Program ID";
609  case V4L2_CID_MPEG_STREAM_PID_PCR: return "Stream PCR Program ID";
610  case V4L2_CID_MPEG_STREAM_PES_ID_AUDIO: return "Stream PES Audio ID";
611  case V4L2_CID_MPEG_STREAM_PES_ID_VIDEO: return "Stream PES Video ID";
612  case V4L2_CID_MPEG_STREAM_VBI_FMT: return "Stream VBI Format";
613  case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ: return "Audio Sampling Frequency";
614  case V4L2_CID_MPEG_AUDIO_ENCODING: return "Audio Encoding";
615  case V4L2_CID_MPEG_AUDIO_L1_BITRATE: return "Audio Layer I Bitrate";
616  case V4L2_CID_MPEG_AUDIO_L2_BITRATE: return "Audio Layer II Bitrate";
617  case V4L2_CID_MPEG_AUDIO_L3_BITRATE: return "Audio Layer III Bitrate";
618  case V4L2_CID_MPEG_AUDIO_MODE: return "Audio Stereo Mode";
619  case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION: return "Audio Stereo Mode Extension";
620  case V4L2_CID_MPEG_AUDIO_EMPHASIS: return "Audio Emphasis";
621  case V4L2_CID_MPEG_AUDIO_CRC: return "Audio CRC";
622  case V4L2_CID_MPEG_AUDIO_MUTE: return "Audio Mute";
623  case V4L2_CID_MPEG_AUDIO_AAC_BITRATE: return "Audio AAC Bitrate";
624  case V4L2_CID_MPEG_AUDIO_AC3_BITRATE: return "Audio AC-3 Bitrate";
625  case V4L2_CID_MPEG_AUDIO_DEC_PLAYBACK: return "Audio Playback";
626  case V4L2_CID_MPEG_AUDIO_DEC_MULTILINGUAL_PLAYBACK: return "Audio Multilingual Playback";
627  case V4L2_CID_MPEG_VIDEO_ENCODING: return "Video Encoding";
628  case V4L2_CID_MPEG_VIDEO_ASPECT: return "Video Aspect";
629  case V4L2_CID_MPEG_VIDEO_B_FRAMES: return "Video B Frames";
630  case V4L2_CID_MPEG_VIDEO_GOP_SIZE: return "Video GOP Size";
631  case V4L2_CID_MPEG_VIDEO_GOP_CLOSURE: return "Video GOP Closure";
632  case V4L2_CID_MPEG_VIDEO_PULLDOWN: return "Video Pulldown";
633  case V4L2_CID_MPEG_VIDEO_BITRATE_MODE: return "Video Bitrate Mode";
634  case V4L2_CID_MPEG_VIDEO_BITRATE: return "Video Bitrate";
635  case V4L2_CID_MPEG_VIDEO_BITRATE_PEAK: return "Video Peak Bitrate";
636  case V4L2_CID_MPEG_VIDEO_TEMPORAL_DECIMATION: return "Video Temporal Decimation";
637  case V4L2_CID_MPEG_VIDEO_MUTE: return "Video Mute";
638  case V4L2_CID_MPEG_VIDEO_MUTE_YUV: return "Video Mute YUV";
639  case V4L2_CID_MPEG_VIDEO_DECODER_SLICE_INTERFACE: return "Decoder Slice Interface";
640  case V4L2_CID_MPEG_VIDEO_DECODER_MPEG4_DEBLOCK_FILTER: return "MPEG4 Loop Filter Enable";
641  case V4L2_CID_MPEG_VIDEO_CYCLIC_INTRA_REFRESH_MB: return "Number of Intra Refresh MBs";
642  case V4L2_CID_MPEG_VIDEO_FRAME_RC_ENABLE: return "Frame Level Rate Control Enable";
643  case V4L2_CID_MPEG_VIDEO_MB_RC_ENABLE: return "H264 MB Level Rate Control";
644  case V4L2_CID_MPEG_VIDEO_HEADER_MODE: return "Sequence Header Mode";
645  case V4L2_CID_MPEG_VIDEO_MAX_REF_PIC: return "Max Number of Reference Pics";
646  case V4L2_CID_MPEG_VIDEO_H263_I_FRAME_QP: return "H263 I-Frame QP Value";
647  case V4L2_CID_MPEG_VIDEO_H263_P_FRAME_QP: return "H263 P-Frame QP Value";
648  case V4L2_CID_MPEG_VIDEO_H263_B_FRAME_QP: return "H263 B-Frame QP Value";
649  case V4L2_CID_MPEG_VIDEO_H263_MIN_QP: return "H263 Minimum QP Value";
650  case V4L2_CID_MPEG_VIDEO_H263_MAX_QP: return "H263 Maximum QP Value";
651  case V4L2_CID_MPEG_VIDEO_H264_I_FRAME_QP: return "H264 I-Frame QP Value";
652  case V4L2_CID_MPEG_VIDEO_H264_P_FRAME_QP: return "H264 P-Frame QP Value";
653  case V4L2_CID_MPEG_VIDEO_H264_B_FRAME_QP: return "H264 B-Frame QP Value";
654  case V4L2_CID_MPEG_VIDEO_H264_MAX_QP: return "H264 Maximum QP Value";
655  case V4L2_CID_MPEG_VIDEO_H264_MIN_QP: return "H264 Minimum QP Value";
656  case V4L2_CID_MPEG_VIDEO_H264_8X8_TRANSFORM: return "H264 8x8 Transform Enable";
657  case V4L2_CID_MPEG_VIDEO_H264_CPB_SIZE: return "H264 CPB Buffer Size";
658  case V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE: return "H264 Entropy Mode";
659  case V4L2_CID_MPEG_VIDEO_H264_I_PERIOD: return "H264 I-Frame Period";
660  case V4L2_CID_MPEG_VIDEO_H264_LEVEL: return "H264 Level";
661  case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_ALPHA: return "H264 Loop Filter Alpha Offset";
662  case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_BETA: return "H264 Loop Filter Beta Offset";
663  case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE: return "H264 Loop Filter Mode";
664  case V4L2_CID_MPEG_VIDEO_H264_PROFILE: return "H264 Profile";
665  case V4L2_CID_MPEG_VIDEO_H264_VUI_EXT_SAR_HEIGHT: return "Vertical Size of SAR";
666  case V4L2_CID_MPEG_VIDEO_H264_VUI_EXT_SAR_WIDTH: return "Horizontal Size of SAR";
667  case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_ENABLE: return "Aspect Ratio VUI Enable";
668  case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC: return "VUI Aspect Ratio IDC";
669  case V4L2_CID_MPEG_VIDEO_H264_SEI_FRAME_PACKING: return "H264 Enable Frame Packing SEI";
670  case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_CURRENT_FRAME_0: return "H264 Set Curr. Frame as Frame0";
671  case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE: return "H264 FP Arrangement Type";
672  case V4L2_CID_MPEG_VIDEO_H264_FMO: return "H264 Flexible MB Ordering";
673  case V4L2_CID_MPEG_VIDEO_H264_FMO_MAP_TYPE: return "H264 Map Type for FMO";
674  case V4L2_CID_MPEG_VIDEO_H264_FMO_SLICE_GROUP: return "H264 FMO Number of Slice Groups";
675  case V4L2_CID_MPEG_VIDEO_H264_FMO_CHANGE_DIRECTION: return "H264 FMO Direction of Change";
676  case V4L2_CID_MPEG_VIDEO_H264_FMO_CHANGE_RATE: return "H264 FMO Size of 1st Slice Grp";
677  case V4L2_CID_MPEG_VIDEO_H264_FMO_RUN_LENGTH: return "H264 FMO No. of Consecutive MBs";
678  case V4L2_CID_MPEG_VIDEO_H264_ASO: return "H264 Arbitrary Slice Ordering";
679  case V4L2_CID_MPEG_VIDEO_H264_ASO_SLICE_ORDER: return "H264 ASO Slice Order";
680  case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING: return "Enable H264 Hierarchical Coding";
681  case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_TYPE: return "H264 Hierarchical Coding Type";
682  case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_LAYER:return "H264 Number of HC Layers";
683  case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_LAYER_QP:
684  return "H264 Set QP Value for HC Layers";
685  case V4L2_CID_MPEG_VIDEO_MPEG4_I_FRAME_QP: return "MPEG4 I-Frame QP Value";
686  case V4L2_CID_MPEG_VIDEO_MPEG4_P_FRAME_QP: return "MPEG4 P-Frame QP Value";
687  case V4L2_CID_MPEG_VIDEO_MPEG4_B_FRAME_QP: return "MPEG4 B-Frame QP Value";
688  case V4L2_CID_MPEG_VIDEO_MPEG4_MIN_QP: return "MPEG4 Minimum QP Value";
689  case V4L2_CID_MPEG_VIDEO_MPEG4_MAX_QP: return "MPEG4 Maximum QP Value";
690  case V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL: return "MPEG4 Level";
691  case V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE: return "MPEG4 Profile";
692  case V4L2_CID_MPEG_VIDEO_MPEG4_QPEL: return "Quarter Pixel Search Enable";
693  case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MAX_BYTES: return "Maximum Bytes in a Slice";
694  case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MAX_MB: return "Number of MBs in a Slice";
695  case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE: return "Slice Partitioning Method";
696  case V4L2_CID_MPEG_VIDEO_VBV_SIZE: return "VBV Buffer Size";
697  case V4L2_CID_MPEG_VIDEO_DEC_PTS: return "Video Decoder PTS";
698  case V4L2_CID_MPEG_VIDEO_DEC_FRAME: return "Video Decoder Frame Count";
699  case V4L2_CID_MPEG_VIDEO_VBV_DELAY: return "Initial Delay for VBV Control";
700 
701  /* CAMERA controls */
702  /* Keep the order of the 'case's the same as in videodev2.h! */
703  case V4L2_CID_CAMERA_CLASS: return "Camera Controls";
704  case V4L2_CID_EXPOSURE_AUTO: return "Auto Exposure";
705  case V4L2_CID_EXPOSURE_ABSOLUTE: return "Exposure Time, Absolute";
706  case V4L2_CID_EXPOSURE_AUTO_PRIORITY: return "Exposure, Dynamic Framerate";
707  case V4L2_CID_PAN_RELATIVE: return "Pan, Relative";
708  case V4L2_CID_TILT_RELATIVE: return "Tilt, Relative";
709  case V4L2_CID_PAN_RESET: return "Pan, Reset";
710  case V4L2_CID_TILT_RESET: return "Tilt, Reset";
711  case V4L2_CID_PAN_ABSOLUTE: return "Pan, Absolute";
712  case V4L2_CID_TILT_ABSOLUTE: return "Tilt, Absolute";
713  case V4L2_CID_FOCUS_ABSOLUTE: return "Focus, Absolute";
714  case V4L2_CID_FOCUS_RELATIVE: return "Focus, Relative";
715  case V4L2_CID_FOCUS_AUTO: return "Focus, Automatic Continuous";
716  case V4L2_CID_ZOOM_ABSOLUTE: return "Zoom, Absolute";
717  case V4L2_CID_ZOOM_RELATIVE: return "Zoom, Relative";
718  case V4L2_CID_ZOOM_CONTINUOUS: return "Zoom, Continuous";
719  case V4L2_CID_PRIVACY: return "Privacy";
720  case V4L2_CID_IRIS_ABSOLUTE: return "Iris, Absolute";
721  case V4L2_CID_IRIS_RELATIVE: return "Iris, Relative";
722  case V4L2_CID_AUTO_EXPOSURE_BIAS: return "Auto Exposure, Bias";
723  case V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE: return "White Balance, Auto & Preset";
724  case V4L2_CID_WIDE_DYNAMIC_RANGE: return "Wide Dynamic Range";
725  case V4L2_CID_IMAGE_STABILIZATION: return "Image Stabilization";
726  case V4L2_CID_ISO_SENSITIVITY: return "ISO Sensitivity";
727  case V4L2_CID_ISO_SENSITIVITY_AUTO: return "ISO Sensitivity, Auto";
728  case V4L2_CID_EXPOSURE_METERING: return "Exposure, Metering Mode";
729  case V4L2_CID_SCENE_MODE: return "Scene Mode";
730  case V4L2_CID_3A_LOCK: return "3A Lock";
731  case V4L2_CID_AUTO_FOCUS_START: return "Auto Focus, Start";
732  case V4L2_CID_AUTO_FOCUS_STOP: return "Auto Focus, Stop";
733  case V4L2_CID_AUTO_FOCUS_STATUS: return "Auto Focus, Status";
734  case V4L2_CID_AUTO_FOCUS_RANGE: return "Auto Focus, Range";
735 
736  /* FM Radio Modulator control */
737  /* Keep the order of the 'case's the same as in videodev2.h! */
738  case V4L2_CID_FM_TX_CLASS: return "FM Radio Modulator Controls";
739  case V4L2_CID_RDS_TX_DEVIATION: return "RDS Signal Deviation";
740  case V4L2_CID_RDS_TX_PI: return "RDS Program ID";
741  case V4L2_CID_RDS_TX_PTY: return "RDS Program Type";
742  case V4L2_CID_RDS_TX_PS_NAME: return "RDS PS Name";
743  case V4L2_CID_RDS_TX_RADIO_TEXT: return "RDS Radio Text";
744  case V4L2_CID_AUDIO_LIMITER_ENABLED: return "Audio Limiter Feature Enabled";
745  case V4L2_CID_AUDIO_LIMITER_RELEASE_TIME: return "Audio Limiter Release Time";
746  case V4L2_CID_AUDIO_LIMITER_DEVIATION: return "Audio Limiter Deviation";
747  case V4L2_CID_AUDIO_COMPRESSION_ENABLED: return "Audio Compression Enabled";
748  case V4L2_CID_AUDIO_COMPRESSION_GAIN: return "Audio Compression Gain";
749  case V4L2_CID_AUDIO_COMPRESSION_THRESHOLD: return "Audio Compression Threshold";
750  case V4L2_CID_AUDIO_COMPRESSION_ATTACK_TIME: return "Audio Compression Attack Time";
751  case V4L2_CID_AUDIO_COMPRESSION_RELEASE_TIME: return "Audio Compression Release Time";
752  case V4L2_CID_PILOT_TONE_ENABLED: return "Pilot Tone Feature Enabled";
753  case V4L2_CID_PILOT_TONE_DEVIATION: return "Pilot Tone Deviation";
754  case V4L2_CID_PILOT_TONE_FREQUENCY: return "Pilot Tone Frequency";
755  case V4L2_CID_TUNE_PREEMPHASIS: return "Pre-Emphasis";
756  case V4L2_CID_TUNE_POWER_LEVEL: return "Tune Power Level";
757  case V4L2_CID_TUNE_ANTENNA_CAPACITOR: return "Tune Antenna Capacitor";
758 
759  /* Flash controls */
760  case V4L2_CID_FLASH_CLASS: return "Flash Controls";
761  case V4L2_CID_FLASH_LED_MODE: return "LED Mode";
762  case V4L2_CID_FLASH_STROBE_SOURCE: return "Strobe Source";
763  case V4L2_CID_FLASH_STROBE: return "Strobe";
764  case V4L2_CID_FLASH_STROBE_STOP: return "Stop Strobe";
765  case V4L2_CID_FLASH_STROBE_STATUS: return "Strobe Status";
766  case V4L2_CID_FLASH_TIMEOUT: return "Strobe Timeout";
767  case V4L2_CID_FLASH_INTENSITY: return "Intensity, Flash Mode";
768  case V4L2_CID_FLASH_TORCH_INTENSITY: return "Intensity, Torch Mode";
769  case V4L2_CID_FLASH_INDICATOR_INTENSITY: return "Intensity, Indicator";
770  case V4L2_CID_FLASH_FAULT: return "Faults";
771  case V4L2_CID_FLASH_CHARGE: return "Charge";
772  case V4L2_CID_FLASH_READY: return "Ready to Strobe";
773 
774  /* JPEG encoder controls */
775  /* Keep the order of the 'case's the same as in videodev2.h! */
776  case V4L2_CID_JPEG_CLASS: return "JPEG Compression Controls";
777  case V4L2_CID_JPEG_CHROMA_SUBSAMPLING: return "Chroma Subsampling";
778  case V4L2_CID_JPEG_RESTART_INTERVAL: return "Restart Interval";
779  case V4L2_CID_JPEG_COMPRESSION_QUALITY: return "Compression Quality";
780  case V4L2_CID_JPEG_ACTIVE_MARKER: return "Active Markers";
781 
782  /* Image source controls */
783  case V4L2_CID_IMAGE_SOURCE_CLASS: return "Image Source Controls";
784  case V4L2_CID_VBLANK: return "Vertical Blanking";
785  case V4L2_CID_HBLANK: return "Horizontal Blanking";
786  case V4L2_CID_ANALOGUE_GAIN: return "Analogue Gain";
787 
788  /* Image processing controls */
789  case V4L2_CID_IMAGE_PROC_CLASS: return "Image Processing Controls";
790  case V4L2_CID_LINK_FREQ: return "Link Frequency";
791  case V4L2_CID_PIXEL_RATE: return "Pixel Rate";
792  case V4L2_CID_TEST_PATTERN: return "Test Pattern";
793 
794  /* DV controls */
795  case V4L2_CID_DV_CLASS: return "Digital Video Controls";
796  case V4L2_CID_DV_TX_HOTPLUG: return "Hotplug Present";
797  case V4L2_CID_DV_TX_RXSENSE: return "RxSense Present";
798  case V4L2_CID_DV_TX_EDID_PRESENT: return "EDID Present";
799  case V4L2_CID_DV_TX_MODE: return "Transmit Mode";
800  case V4L2_CID_DV_TX_RGB_RANGE: return "Tx RGB Quantization Range";
801  case V4L2_CID_DV_RX_POWER_PRESENT: return "Power Present";
802  case V4L2_CID_DV_RX_RGB_RANGE: return "Rx RGB Quantization Range";
803 
804  default:
805  return NULL;
806  }
807 }
808 EXPORT_SYMBOL(v4l2_ctrl_get_name);
809 
810 void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type,
811  s32 *min, s32 *max, s32 *step, s32 *def, u32 *flags)
812 {
813  *name = v4l2_ctrl_get_name(id);
814  *flags = 0;
815 
816  switch (id) {
817  case V4L2_CID_AUDIO_MUTE:
818  case V4L2_CID_AUDIO_LOUDNESS:
819  case V4L2_CID_AUTO_WHITE_BALANCE:
820  case V4L2_CID_AUTOGAIN:
821  case V4L2_CID_HFLIP:
822  case V4L2_CID_VFLIP:
823  case V4L2_CID_HUE_AUTO:
824  case V4L2_CID_CHROMA_AGC:
825  case V4L2_CID_COLOR_KILLER:
826  case V4L2_CID_AUTOBRIGHTNESS:
827  case V4L2_CID_MPEG_AUDIO_MUTE:
828  case V4L2_CID_MPEG_VIDEO_MUTE:
829  case V4L2_CID_MPEG_VIDEO_GOP_CLOSURE:
830  case V4L2_CID_MPEG_VIDEO_PULLDOWN:
831  case V4L2_CID_EXPOSURE_AUTO_PRIORITY:
832  case V4L2_CID_FOCUS_AUTO:
833  case V4L2_CID_PRIVACY:
834  case V4L2_CID_AUDIO_LIMITER_ENABLED:
835  case V4L2_CID_AUDIO_COMPRESSION_ENABLED:
836  case V4L2_CID_PILOT_TONE_ENABLED:
837  case V4L2_CID_ILLUMINATORS_1:
838  case V4L2_CID_ILLUMINATORS_2:
839  case V4L2_CID_FLASH_STROBE_STATUS:
840  case V4L2_CID_FLASH_CHARGE:
841  case V4L2_CID_FLASH_READY:
842  case V4L2_CID_MPEG_VIDEO_DECODER_MPEG4_DEBLOCK_FILTER:
843  case V4L2_CID_MPEG_VIDEO_DECODER_SLICE_INTERFACE:
844  case V4L2_CID_MPEG_VIDEO_FRAME_RC_ENABLE:
845  case V4L2_CID_MPEG_VIDEO_MB_RC_ENABLE:
846  case V4L2_CID_MPEG_VIDEO_H264_8X8_TRANSFORM:
847  case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_ENABLE:
848  case V4L2_CID_MPEG_VIDEO_MPEG4_QPEL:
849  case V4L2_CID_WIDE_DYNAMIC_RANGE:
850  case V4L2_CID_IMAGE_STABILIZATION:
851  *type = V4L2_CTRL_TYPE_BOOLEAN;
852  *min = 0;
853  *max = *step = 1;
854  break;
855  case V4L2_CID_PAN_RESET:
856  case V4L2_CID_TILT_RESET:
857  case V4L2_CID_FLASH_STROBE:
858  case V4L2_CID_FLASH_STROBE_STOP:
859  case V4L2_CID_AUTO_FOCUS_START:
860  case V4L2_CID_AUTO_FOCUS_STOP:
861  *type = V4L2_CTRL_TYPE_BUTTON;
862  *flags |= V4L2_CTRL_FLAG_WRITE_ONLY;
863  *min = *max = *step = *def = 0;
864  break;
865  case V4L2_CID_POWER_LINE_FREQUENCY:
866  case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ:
867  case V4L2_CID_MPEG_AUDIO_ENCODING:
868  case V4L2_CID_MPEG_AUDIO_L1_BITRATE:
869  case V4L2_CID_MPEG_AUDIO_L2_BITRATE:
870  case V4L2_CID_MPEG_AUDIO_L3_BITRATE:
871  case V4L2_CID_MPEG_AUDIO_AC3_BITRATE:
872  case V4L2_CID_MPEG_AUDIO_MODE:
873  case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION:
874  case V4L2_CID_MPEG_AUDIO_EMPHASIS:
875  case V4L2_CID_MPEG_AUDIO_CRC:
876  case V4L2_CID_MPEG_AUDIO_DEC_PLAYBACK:
877  case V4L2_CID_MPEG_AUDIO_DEC_MULTILINGUAL_PLAYBACK:
878  case V4L2_CID_MPEG_VIDEO_ENCODING:
879  case V4L2_CID_MPEG_VIDEO_ASPECT:
880  case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
881  case V4L2_CID_MPEG_STREAM_TYPE:
882  case V4L2_CID_MPEG_STREAM_VBI_FMT:
883  case V4L2_CID_EXPOSURE_AUTO:
884  case V4L2_CID_AUTO_FOCUS_RANGE:
885  case V4L2_CID_COLORFX:
886  case V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE:
887  case V4L2_CID_TUNE_PREEMPHASIS:
888  case V4L2_CID_FLASH_LED_MODE:
889  case V4L2_CID_FLASH_STROBE_SOURCE:
890  case V4L2_CID_MPEG_VIDEO_HEADER_MODE:
891  case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE:
892  case V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE:
893  case V4L2_CID_MPEG_VIDEO_H264_LEVEL:
894  case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE:
895  case V4L2_CID_MPEG_VIDEO_H264_PROFILE:
896  case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC:
897  case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE:
898  case V4L2_CID_MPEG_VIDEO_H264_FMO_MAP_TYPE:
899  case V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL:
900  case V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE:
901  case V4L2_CID_JPEG_CHROMA_SUBSAMPLING:
902  case V4L2_CID_ISO_SENSITIVITY_AUTO:
903  case V4L2_CID_EXPOSURE_METERING:
904  case V4L2_CID_SCENE_MODE:
905  case V4L2_CID_DV_TX_MODE:
906  case V4L2_CID_DV_TX_RGB_RANGE:
907  case V4L2_CID_DV_RX_RGB_RANGE:
908  case V4L2_CID_TEST_PATTERN:
909  *type = V4L2_CTRL_TYPE_MENU;
910  break;
911  case V4L2_CID_LINK_FREQ:
912  *type = V4L2_CTRL_TYPE_INTEGER_MENU;
913  break;
914  case V4L2_CID_RDS_TX_PS_NAME:
915  case V4L2_CID_RDS_TX_RADIO_TEXT:
916  *type = V4L2_CTRL_TYPE_STRING;
917  break;
918  case V4L2_CID_ISO_SENSITIVITY:
919  case V4L2_CID_AUTO_EXPOSURE_BIAS:
920  *type = V4L2_CTRL_TYPE_INTEGER_MENU;
921  break;
922  case V4L2_CID_USER_CLASS:
923  case V4L2_CID_CAMERA_CLASS:
924  case V4L2_CID_MPEG_CLASS:
925  case V4L2_CID_FM_TX_CLASS:
926  case V4L2_CID_FLASH_CLASS:
927  case V4L2_CID_JPEG_CLASS:
928  case V4L2_CID_IMAGE_SOURCE_CLASS:
929  case V4L2_CID_IMAGE_PROC_CLASS:
930  case V4L2_CID_DV_CLASS:
931  *type = V4L2_CTRL_TYPE_CTRL_CLASS;
932  /* You can neither read not write these */
933  *flags |= V4L2_CTRL_FLAG_READ_ONLY | V4L2_CTRL_FLAG_WRITE_ONLY;
934  *min = *max = *step = *def = 0;
935  break;
936  case V4L2_CID_BG_COLOR:
937  *type = V4L2_CTRL_TYPE_INTEGER;
938  *step = 1;
939  *min = 0;
940  /* Max is calculated as RGB888 that is 2^24 */
941  *max = 0xFFFFFF;
942  break;
943  case V4L2_CID_FLASH_FAULT:
944  case V4L2_CID_JPEG_ACTIVE_MARKER:
945  case V4L2_CID_3A_LOCK:
946  case V4L2_CID_AUTO_FOCUS_STATUS:
947  case V4L2_CID_DV_TX_HOTPLUG:
948  case V4L2_CID_DV_TX_RXSENSE:
949  case V4L2_CID_DV_TX_EDID_PRESENT:
950  case V4L2_CID_DV_RX_POWER_PRESENT:
951  *type = V4L2_CTRL_TYPE_BITMASK;
952  break;
953  case V4L2_CID_MIN_BUFFERS_FOR_CAPTURE:
954  case V4L2_CID_MIN_BUFFERS_FOR_OUTPUT:
955  *type = V4L2_CTRL_TYPE_INTEGER;
956  *flags |= V4L2_CTRL_FLAG_READ_ONLY;
957  break;
958  case V4L2_CID_MPEG_VIDEO_DEC_FRAME:
959  case V4L2_CID_MPEG_VIDEO_DEC_PTS:
960  *flags |= V4L2_CTRL_FLAG_VOLATILE;
961  /* Fall through */
962  case V4L2_CID_PIXEL_RATE:
963  *type = V4L2_CTRL_TYPE_INTEGER64;
964  *flags |= V4L2_CTRL_FLAG_READ_ONLY;
965  *min = *max = *step = *def = 0;
966  break;
967  default:
968  *type = V4L2_CTRL_TYPE_INTEGER;
969  break;
970  }
971  switch (id) {
972  case V4L2_CID_MPEG_AUDIO_ENCODING:
973  case V4L2_CID_MPEG_AUDIO_MODE:
974  case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
975  case V4L2_CID_MPEG_VIDEO_B_FRAMES:
976  case V4L2_CID_MPEG_STREAM_TYPE:
977  *flags |= V4L2_CTRL_FLAG_UPDATE;
978  break;
979  case V4L2_CID_AUDIO_VOLUME:
980  case V4L2_CID_AUDIO_BALANCE:
981  case V4L2_CID_AUDIO_BASS:
982  case V4L2_CID_AUDIO_TREBLE:
983  case V4L2_CID_BRIGHTNESS:
984  case V4L2_CID_CONTRAST:
985  case V4L2_CID_SATURATION:
986  case V4L2_CID_HUE:
987  case V4L2_CID_RED_BALANCE:
988  case V4L2_CID_BLUE_BALANCE:
989  case V4L2_CID_GAMMA:
990  case V4L2_CID_SHARPNESS:
991  case V4L2_CID_CHROMA_GAIN:
992  case V4L2_CID_RDS_TX_DEVIATION:
993  case V4L2_CID_AUDIO_LIMITER_RELEASE_TIME:
994  case V4L2_CID_AUDIO_LIMITER_DEVIATION:
995  case V4L2_CID_AUDIO_COMPRESSION_GAIN:
996  case V4L2_CID_AUDIO_COMPRESSION_THRESHOLD:
997  case V4L2_CID_AUDIO_COMPRESSION_ATTACK_TIME:
998  case V4L2_CID_AUDIO_COMPRESSION_RELEASE_TIME:
999  case V4L2_CID_PILOT_TONE_DEVIATION:
1000  case V4L2_CID_PILOT_TONE_FREQUENCY:
1001  case V4L2_CID_TUNE_POWER_LEVEL:
1002  case V4L2_CID_TUNE_ANTENNA_CAPACITOR:
1003  *flags |= V4L2_CTRL_FLAG_SLIDER;
1004  break;
1005  case V4L2_CID_PAN_RELATIVE:
1006  case V4L2_CID_TILT_RELATIVE:
1007  case V4L2_CID_FOCUS_RELATIVE:
1008  case V4L2_CID_IRIS_RELATIVE:
1009  case V4L2_CID_ZOOM_RELATIVE:
1010  *flags |= V4L2_CTRL_FLAG_WRITE_ONLY;
1011  break;
1012  case V4L2_CID_FLASH_STROBE_STATUS:
1013  case V4L2_CID_AUTO_FOCUS_STATUS:
1014  case V4L2_CID_FLASH_READY:
1015  case V4L2_CID_DV_TX_HOTPLUG:
1016  case V4L2_CID_DV_TX_RXSENSE:
1017  case V4L2_CID_DV_TX_EDID_PRESENT:
1018  case V4L2_CID_DV_RX_POWER_PRESENT:
1019  *flags |= V4L2_CTRL_FLAG_READ_ONLY;
1020  break;
1021  }
1022 }
1023 EXPORT_SYMBOL(v4l2_ctrl_fill);
1024 
1025 /* Helper function to determine whether the control type is compatible with
1026  VIDIOC_G/S_CTRL. */
1027 static bool type_is_int(const struct v4l2_ctrl *ctrl)
1028 {
1029  switch (ctrl->type) {
1030  case V4L2_CTRL_TYPE_INTEGER64:
1031  case V4L2_CTRL_TYPE_STRING:
1032  /* Nope, these need v4l2_ext_control */
1033  return false;
1034  default:
1035  return true;
1036  }
1037 }
1038 
1039 static void fill_event(struct v4l2_event *ev, struct v4l2_ctrl *ctrl, u32 changes)
1040 {
1041  memset(ev->reserved, 0, sizeof(ev->reserved));
1042  ev->type = V4L2_EVENT_CTRL;
1043  ev->id = ctrl->id;
1044  ev->u.ctrl.changes = changes;
1045  ev->u.ctrl.type = ctrl->type;
1046  ev->u.ctrl.flags = ctrl->flags;
1047  if (ctrl->type == V4L2_CTRL_TYPE_STRING)
1048  ev->u.ctrl.value64 = 0;
1049  else
1050  ev->u.ctrl.value64 = ctrl->cur.val64;
1051  ev->u.ctrl.minimum = ctrl->minimum;
1052  ev->u.ctrl.maximum = ctrl->maximum;
1053  if (ctrl->type == V4L2_CTRL_TYPE_MENU
1054  || ctrl->type == V4L2_CTRL_TYPE_INTEGER_MENU)
1055  ev->u.ctrl.step = 1;
1056  else
1057  ev->u.ctrl.step = ctrl->step;
1058  ev->u.ctrl.default_value = ctrl->default_value;
1059 }
1060 
1061 static void send_event(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, u32 changes)
1062 {
1063  struct v4l2_event ev;
1064  struct v4l2_subscribed_event *sev;
1065 
1066  if (list_empty(&ctrl->ev_subs))
1067  return;
1068  fill_event(&ev, ctrl, changes);
1069 
1070  list_for_each_entry(sev, &ctrl->ev_subs, node)
1071  if (sev->fh != fh ||
1072  (sev->flags & V4L2_EVENT_SUB_FL_ALLOW_FEEDBACK))
1073  v4l2_event_queue_fh(sev->fh, &ev);
1074 }
1075 
1076 /* Helper function: copy the current control value back to the caller */
1077 static int cur_to_user(struct v4l2_ext_control *c,
1078  struct v4l2_ctrl *ctrl)
1079 {
1080  u32 len;
1081 
1082  switch (ctrl->type) {
1083  case V4L2_CTRL_TYPE_STRING:
1084  len = strlen(ctrl->cur.string);
1085  if (c->size < len + 1) {
1086  c->size = len + 1;
1087  return -ENOSPC;
1088  }
1089  return copy_to_user(c->string, ctrl->cur.string,
1090  len + 1) ? -EFAULT : 0;
1091  case V4L2_CTRL_TYPE_INTEGER64:
1092  c->value64 = ctrl->cur.val64;
1093  break;
1094  default:
1095  c->value = ctrl->cur.val;
1096  break;
1097  }
1098  return 0;
1099 }
1100 
1101 /* Helper function: copy the caller-provider value as the new control value */
1102 static int user_to_new(struct v4l2_ext_control *c,
1103  struct v4l2_ctrl *ctrl)
1104 {
1105  int ret;
1106  u32 size;
1107 
1108  ctrl->is_new = 1;
1109  switch (ctrl->type) {
1110  case V4L2_CTRL_TYPE_INTEGER64:
1111  ctrl->val64 = c->value64;
1112  break;
1113  case V4L2_CTRL_TYPE_STRING:
1114  size = c->size;
1115  if (size == 0)
1116  return -ERANGE;
1117  if (size > ctrl->maximum + 1)
1118  size = ctrl->maximum + 1;
1119  ret = copy_from_user(ctrl->string, c->string, size);
1120  if (!ret) {
1121  char last = ctrl->string[size - 1];
1122 
1123  ctrl->string[size - 1] = 0;
1124  /* If the string was longer than ctrl->maximum,
1125  then return an error. */
1126  if (strlen(ctrl->string) == ctrl->maximum && last)
1127  return -ERANGE;
1128  }
1129  return ret ? -EFAULT : 0;
1130  default:
1131  ctrl->val = c->value;
1132  break;
1133  }
1134  return 0;
1135 }
1136 
1137 /* Helper function: copy the new control value back to the caller */
1138 static int new_to_user(struct v4l2_ext_control *c,
1139  struct v4l2_ctrl *ctrl)
1140 {
1141  u32 len;
1142 
1143  switch (ctrl->type) {
1144  case V4L2_CTRL_TYPE_STRING:
1145  len = strlen(ctrl->string);
1146  if (c->size < len + 1) {
1147  c->size = ctrl->maximum + 1;
1148  return -ENOSPC;
1149  }
1150  return copy_to_user(c->string, ctrl->string,
1151  len + 1) ? -EFAULT : 0;
1152  case V4L2_CTRL_TYPE_INTEGER64:
1153  c->value64 = ctrl->val64;
1154  break;
1155  default:
1156  c->value = ctrl->val;
1157  break;
1158  }
1159  return 0;
1160 }
1161 
1162 /* Copy the new value to the current value. */
1163 static void new_to_cur(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl,
1164  bool update_inactive)
1165 {
1166  bool changed = false;
1167 
1168  if (ctrl == NULL)
1169  return;
1170  switch (ctrl->type) {
1171  case V4L2_CTRL_TYPE_BUTTON:
1172  changed = true;
1173  break;
1174  case V4L2_CTRL_TYPE_STRING:
1175  /* strings are always 0-terminated */
1176  changed = strcmp(ctrl->string, ctrl->cur.string);
1177  strcpy(ctrl->cur.string, ctrl->string);
1178  break;
1179  case V4L2_CTRL_TYPE_INTEGER64:
1180  changed = ctrl->val64 != ctrl->cur.val64;
1181  ctrl->cur.val64 = ctrl->val64;
1182  break;
1183  default:
1184  changed = ctrl->val != ctrl->cur.val;
1185  ctrl->cur.val = ctrl->val;
1186  break;
1187  }
1188  if (update_inactive) {
1189  /* Note: update_inactive can only be true for auto clusters. */
1190  ctrl->flags &=
1191  ~(V4L2_CTRL_FLAG_INACTIVE | V4L2_CTRL_FLAG_VOLATILE);
1192  if (!is_cur_manual(ctrl->cluster[0])) {
1193  ctrl->flags |= V4L2_CTRL_FLAG_INACTIVE;
1194  if (ctrl->cluster[0]->has_volatiles)
1195  ctrl->flags |= V4L2_CTRL_FLAG_VOLATILE;
1196  }
1197  fh = NULL;
1198  }
1199  if (changed || update_inactive) {
1200  /* If a control was changed that was not one of the controls
1201  modified by the application, then send the event to all. */
1202  if (!ctrl->is_new)
1203  fh = NULL;
1204  send_event(fh, ctrl,
1205  (changed ? V4L2_EVENT_CTRL_CH_VALUE : 0) |
1206  (update_inactive ? V4L2_EVENT_CTRL_CH_FLAGS : 0));
1207  }
1208 }
1209 
1210 /* Copy the current value to the new value */
1211 static void cur_to_new(struct v4l2_ctrl *ctrl)
1212 {
1213  if (ctrl == NULL)
1214  return;
1215  switch (ctrl->type) {
1216  case V4L2_CTRL_TYPE_STRING:
1217  /* strings are always 0-terminated */
1218  strcpy(ctrl->string, ctrl->cur.string);
1219  break;
1220  case V4L2_CTRL_TYPE_INTEGER64:
1221  ctrl->val64 = ctrl->cur.val64;
1222  break;
1223  default:
1224  ctrl->val = ctrl->cur.val;
1225  break;
1226  }
1227 }
1228 
1229 /* Return non-zero if one or more of the controls in the cluster has a new
1230  value that differs from the current value. */
1231 static int cluster_changed(struct v4l2_ctrl *master)
1232 {
1233  int diff = 0;
1234  int i;
1235 
1236  for (i = 0; !diff && i < master->ncontrols; i++) {
1237  struct v4l2_ctrl *ctrl = master->cluster[i];
1238 
1239  if (ctrl == NULL)
1240  continue;
1241  switch (ctrl->type) {
1242  case V4L2_CTRL_TYPE_BUTTON:
1243  /* Button controls are always 'different' */
1244  return 1;
1245  case V4L2_CTRL_TYPE_STRING:
1246  /* strings are always 0-terminated */
1247  diff = strcmp(ctrl->string, ctrl->cur.string);
1248  break;
1249  case V4L2_CTRL_TYPE_INTEGER64:
1250  diff = ctrl->val64 != ctrl->cur.val64;
1251  break;
1252  default:
1253  diff = ctrl->val != ctrl->cur.val;
1254  break;
1255  }
1256  }
1257  return diff;
1258 }
1259 
1260 /* Validate a new control */
1261 static int validate_new(const struct v4l2_ctrl *ctrl,
1262  struct v4l2_ext_control *c)
1263 {
1264  size_t len;
1265  u32 offset;
1266  s32 val;
1267 
1268  switch (ctrl->type) {
1269  case V4L2_CTRL_TYPE_INTEGER:
1270  /* Round towards the closest legal value */
1271  val = c->value + ctrl->step / 2;
1272  val = clamp(val, ctrl->minimum, ctrl->maximum);
1273  offset = val - ctrl->minimum;
1274  offset = ctrl->step * (offset / ctrl->step);
1275  c->value = ctrl->minimum + offset;
1276  return 0;
1277 
1278  case V4L2_CTRL_TYPE_BOOLEAN:
1279  c->value = !!c->value;
1280  return 0;
1281 
1282  case V4L2_CTRL_TYPE_MENU:
1283  case V4L2_CTRL_TYPE_INTEGER_MENU:
1284  if (c->value < ctrl->minimum || c->value > ctrl->maximum)
1285  return -ERANGE;
1286  if (ctrl->menu_skip_mask & (1 << c->value))
1287  return -EINVAL;
1288  if (ctrl->type == V4L2_CTRL_TYPE_MENU &&
1289  ctrl->qmenu[c->value][0] == '\0')
1290  return -EINVAL;
1291  return 0;
1292 
1293  case V4L2_CTRL_TYPE_BITMASK:
1294  c->value &= ctrl->maximum;
1295  return 0;
1296 
1297  case V4L2_CTRL_TYPE_BUTTON:
1298  case V4L2_CTRL_TYPE_CTRL_CLASS:
1299  c->value = 0;
1300  return 0;
1301 
1302  case V4L2_CTRL_TYPE_INTEGER64:
1303  return 0;
1304 
1305  case V4L2_CTRL_TYPE_STRING:
1306  len = strlen(c->string);
1307  if (len < ctrl->minimum)
1308  return -ERANGE;
1309  if ((len - ctrl->minimum) % ctrl->step)
1310  return -ERANGE;
1311  return 0;
1312 
1313  default:
1314  return -EINVAL;
1315  }
1316 }
1317 
1318 static inline u32 node2id(struct list_head *node)
1319 {
1320  return list_entry(node, struct v4l2_ctrl_ref, node)->ctrl->id;
1321 }
1322 
1323 /* Set the handler's error code if it wasn't set earlier already */
1324 static inline int handler_set_err(struct v4l2_ctrl_handler *hdl, int err)
1325 {
1326  if (hdl->error == 0)
1327  hdl->error = err;
1328  return err;
1329 }
1330 
1331 /* Initialize the handler */
1332 int v4l2_ctrl_handler_init(struct v4l2_ctrl_handler *hdl,
1333  unsigned nr_of_controls_hint)
1334 {
1335  hdl->lock = &hdl->_lock;
1336  mutex_init(hdl->lock);
1337  INIT_LIST_HEAD(&hdl->ctrls);
1338  INIT_LIST_HEAD(&hdl->ctrl_refs);
1339  hdl->nr_of_buckets = 1 + nr_of_controls_hint / 8;
1340  hdl->buckets = kcalloc(hdl->nr_of_buckets, sizeof(hdl->buckets[0]),
1341  GFP_KERNEL);
1342  hdl->error = hdl->buckets ? 0 : -ENOMEM;
1343  return hdl->error;
1344 }
1345 EXPORT_SYMBOL(v4l2_ctrl_handler_init);
1346 
1347 /* Free all controls and control refs */
1348 void v4l2_ctrl_handler_free(struct v4l2_ctrl_handler *hdl)
1349 {
1350  struct v4l2_ctrl_ref *ref, *next_ref;
1351  struct v4l2_ctrl *ctrl, *next_ctrl;
1352  struct v4l2_subscribed_event *sev, *next_sev;
1353 
1354  if (hdl == NULL || hdl->buckets == NULL)
1355  return;
1356 
1357  mutex_lock(hdl->lock);
1358  /* Free all nodes */
1359  list_for_each_entry_safe(ref, next_ref, &hdl->ctrl_refs, node) {
1360  list_del(&ref->node);
1361  kfree(ref);
1362  }
1363  /* Free all controls owned by the handler */
1364  list_for_each_entry_safe(ctrl, next_ctrl, &hdl->ctrls, node) {
1365  list_del(&ctrl->node);
1366  list_for_each_entry_safe(sev, next_sev, &ctrl->ev_subs, node)
1367  list_del(&sev->node);
1368  kfree(ctrl);
1369  }
1370  kfree(hdl->buckets);
1371  hdl->buckets = NULL;
1372  hdl->cached = NULL;
1373  hdl->error = 0;
1374  mutex_unlock(hdl->lock);
1375 }
1376 EXPORT_SYMBOL(v4l2_ctrl_handler_free);
1377 
1378 /* For backwards compatibility: V4L2_CID_PRIVATE_BASE should no longer
1379  be used except in G_CTRL, S_CTRL, QUERYCTRL and QUERYMENU when dealing
1380  with applications that do not use the NEXT_CTRL flag.
1381 
1382  We just find the n-th private user control. It's O(N), but that should not
1383  be an issue in this particular case. */
1384 static struct v4l2_ctrl_ref *find_private_ref(
1385  struct v4l2_ctrl_handler *hdl, u32 id)
1386 {
1387  struct v4l2_ctrl_ref *ref;
1388 
1389  id -= V4L2_CID_PRIVATE_BASE;
1390  list_for_each_entry(ref, &hdl->ctrl_refs, node) {
1391  /* Search for private user controls that are compatible with
1392  VIDIOC_G/S_CTRL. */
1393  if (V4L2_CTRL_ID2CLASS(ref->ctrl->id) == V4L2_CTRL_CLASS_USER &&
1394  V4L2_CTRL_DRIVER_PRIV(ref->ctrl->id)) {
1395  if (!type_is_int(ref->ctrl))
1396  continue;
1397  if (id == 0)
1398  return ref;
1399  id--;
1400  }
1401  }
1402  return NULL;
1403 }
1404 
1405 /* Find a control with the given ID. */
1406 static struct v4l2_ctrl_ref *find_ref(struct v4l2_ctrl_handler *hdl, u32 id)
1407 {
1408  struct v4l2_ctrl_ref *ref;
1409  int bucket;
1410 
1411  id &= V4L2_CTRL_ID_MASK;
1412 
1413  /* Old-style private controls need special handling */
1414  if (id >= V4L2_CID_PRIVATE_BASE)
1415  return find_private_ref(hdl, id);
1416  bucket = id % hdl->nr_of_buckets;
1417 
1418  /* Simple optimization: cache the last control found */
1419  if (hdl->cached && hdl->cached->ctrl->id == id)
1420  return hdl->cached;
1421 
1422  /* Not in cache, search the hash */
1423  ref = hdl->buckets ? hdl->buckets[bucket] : NULL;
1424  while (ref && ref->ctrl->id != id)
1425  ref = ref->next;
1426 
1427  if (ref)
1428  hdl->cached = ref; /* cache it! */
1429  return ref;
1430 }
1431 
1432 /* Find a control with the given ID. Take the handler's lock first. */
1433 static struct v4l2_ctrl_ref *find_ref_lock(
1434  struct v4l2_ctrl_handler *hdl, u32 id)
1435 {
1436  struct v4l2_ctrl_ref *ref = NULL;
1437 
1438  if (hdl) {
1439  mutex_lock(hdl->lock);
1440  ref = find_ref(hdl, id);
1441  mutex_unlock(hdl->lock);
1442  }
1443  return ref;
1444 }
1445 
1446 /* Find a control with the given ID. */
1447 struct v4l2_ctrl *v4l2_ctrl_find(struct v4l2_ctrl_handler *hdl, u32 id)
1448 {
1449  struct v4l2_ctrl_ref *ref = find_ref_lock(hdl, id);
1450 
1451  return ref ? ref->ctrl : NULL;
1452 }
1453 EXPORT_SYMBOL(v4l2_ctrl_find);
1454 
1455 /* Allocate a new v4l2_ctrl_ref and hook it into the handler. */
1456 static int handler_new_ref(struct v4l2_ctrl_handler *hdl,
1457  struct v4l2_ctrl *ctrl)
1458 {
1459  struct v4l2_ctrl_ref *ref;
1460  struct v4l2_ctrl_ref *new_ref;
1461  u32 id = ctrl->id;
1462  u32 class_ctrl = V4L2_CTRL_ID2CLASS(id) | 1;
1463  int bucket = id % hdl->nr_of_buckets; /* which bucket to use */
1464 
1465  /* Automatically add the control class if it is not yet present. */
1466  if (id != class_ctrl && find_ref_lock(hdl, class_ctrl) == NULL)
1467  if (!v4l2_ctrl_new_std(hdl, NULL, class_ctrl, 0, 0, 0, 0))
1468  return hdl->error;
1469 
1470  if (hdl->error)
1471  return hdl->error;
1472 
1473  new_ref = kzalloc(sizeof(*new_ref), GFP_KERNEL);
1474  if (!new_ref)
1475  return handler_set_err(hdl, -ENOMEM);
1476  new_ref->ctrl = ctrl;
1477  if (ctrl->handler == hdl) {
1478  /* By default each control starts in a cluster of its own.
1479  new_ref->ctrl is basically a cluster array with one
1480  element, so that's perfect to use as the cluster pointer.
1481  But only do this for the handler that owns the control. */
1482  ctrl->cluster = &new_ref->ctrl;
1483  ctrl->ncontrols = 1;
1484  }
1485 
1486  INIT_LIST_HEAD(&new_ref->node);
1487 
1488  mutex_lock(hdl->lock);
1489 
1490  /* Add immediately at the end of the list if the list is empty, or if
1491  the last element in the list has a lower ID.
1492  This ensures that when elements are added in ascending order the
1493  insertion is an O(1) operation. */
1494  if (list_empty(&hdl->ctrl_refs) || id > node2id(hdl->ctrl_refs.prev)) {
1495  list_add_tail(&new_ref->node, &hdl->ctrl_refs);
1496  goto insert_in_hash;
1497  }
1498 
1499  /* Find insert position in sorted list */
1500  list_for_each_entry(ref, &hdl->ctrl_refs, node) {
1501  if (ref->ctrl->id < id)
1502  continue;
1503  /* Don't add duplicates */
1504  if (ref->ctrl->id == id) {
1505  kfree(new_ref);
1506  goto unlock;
1507  }
1508  list_add(&new_ref->node, ref->node.prev);
1509  break;
1510  }
1511 
1512 insert_in_hash:
1513  /* Insert the control node in the hash */
1514  new_ref->next = hdl->buckets[bucket];
1515  hdl->buckets[bucket] = new_ref;
1516 
1517 unlock:
1518  mutex_unlock(hdl->lock);
1519  return 0;
1520 }
1521 
1522 /* Add a new control */
1523 static struct v4l2_ctrl *v4l2_ctrl_new(struct v4l2_ctrl_handler *hdl,
1524  const struct v4l2_ctrl_ops *ops,
1525  u32 id, const char *name, enum v4l2_ctrl_type type,
1526  s32 min, s32 max, u32 step, s32 def,
1527  u32 flags, const char * const *qmenu,
1528  const s64 *qmenu_int, void *priv)
1529 {
1530  struct v4l2_ctrl *ctrl;
1531  unsigned sz_extra = 0;
1532 
1533  if (hdl->error)
1534  return NULL;
1535 
1536  /* Sanity checks */
1537  if (id == 0 || name == NULL || id >= V4L2_CID_PRIVATE_BASE ||
1538  (type == V4L2_CTRL_TYPE_INTEGER && step == 0) ||
1539  (type == V4L2_CTRL_TYPE_BITMASK && max == 0) ||
1540  (type == V4L2_CTRL_TYPE_MENU && qmenu == NULL) ||
1541  (type == V4L2_CTRL_TYPE_INTEGER_MENU && qmenu_int == NULL) ||
1542  (type == V4L2_CTRL_TYPE_STRING && max == 0)) {
1543  handler_set_err(hdl, -ERANGE);
1544  return NULL;
1545  }
1546  if (type != V4L2_CTRL_TYPE_BITMASK && max < min) {
1547  handler_set_err(hdl, -ERANGE);
1548  return NULL;
1549  }
1550  if ((type == V4L2_CTRL_TYPE_INTEGER ||
1551  type == V4L2_CTRL_TYPE_MENU ||
1552  type == V4L2_CTRL_TYPE_INTEGER_MENU ||
1553  type == V4L2_CTRL_TYPE_BOOLEAN) &&
1554  (def < min || def > max)) {
1555  handler_set_err(hdl, -ERANGE);
1556  return NULL;
1557  }
1558  if (type == V4L2_CTRL_TYPE_BITMASK && ((def & ~max) || min || step)) {
1559  handler_set_err(hdl, -ERANGE);
1560  return NULL;
1561  }
1562 
1563  if (type == V4L2_CTRL_TYPE_BUTTON)
1564  flags |= V4L2_CTRL_FLAG_WRITE_ONLY;
1565  else if (type == V4L2_CTRL_TYPE_CTRL_CLASS)
1566  flags |= V4L2_CTRL_FLAG_READ_ONLY;
1567  else if (type == V4L2_CTRL_TYPE_STRING)
1568  sz_extra += 2 * (max + 1);
1569 
1570  ctrl = kzalloc(sizeof(*ctrl) + sz_extra, GFP_KERNEL);
1571  if (ctrl == NULL) {
1572  handler_set_err(hdl, -ENOMEM);
1573  return NULL;
1574  }
1575 
1576  INIT_LIST_HEAD(&ctrl->node);
1577  INIT_LIST_HEAD(&ctrl->ev_subs);
1578  ctrl->handler = hdl;
1579  ctrl->ops = ops;
1580  ctrl->id = id;
1581  ctrl->name = name;
1582  ctrl->type = type;
1583  ctrl->flags = flags;
1584  ctrl->minimum = min;
1585  ctrl->maximum = max;
1586  ctrl->step = step;
1587  if (type == V4L2_CTRL_TYPE_MENU)
1588  ctrl->qmenu = qmenu;
1589  else if (type == V4L2_CTRL_TYPE_INTEGER_MENU)
1590  ctrl->qmenu_int = qmenu_int;
1591  ctrl->priv = priv;
1592  ctrl->cur.val = ctrl->val = ctrl->default_value = def;
1593 
1594  if (ctrl->type == V4L2_CTRL_TYPE_STRING) {
1595  ctrl->cur.string = (char *)&ctrl[1] + sz_extra - (max + 1);
1596  ctrl->string = (char *)&ctrl[1] + sz_extra - 2 * (max + 1);
1597  if (ctrl->minimum)
1598  memset(ctrl->cur.string, ' ', ctrl->minimum);
1599  }
1600  if (handler_new_ref(hdl, ctrl)) {
1601  kfree(ctrl);
1602  return NULL;
1603  }
1604  mutex_lock(hdl->lock);
1605  list_add_tail(&ctrl->node, &hdl->ctrls);
1606  mutex_unlock(hdl->lock);
1607  return ctrl;
1608 }
1609 
1610 struct v4l2_ctrl *v4l2_ctrl_new_custom(struct v4l2_ctrl_handler *hdl,
1611  const struct v4l2_ctrl_config *cfg, void *priv)
1612 {
1613  bool is_menu;
1614  struct v4l2_ctrl *ctrl;
1615  const char *name = cfg->name;
1616  const char * const *qmenu = cfg->qmenu;
1617  const s64 *qmenu_int = cfg->qmenu_int;
1618  enum v4l2_ctrl_type type = cfg->type;
1619  u32 flags = cfg->flags;
1620  s32 min = cfg->min;
1621  s32 max = cfg->max;
1622  u32 step = cfg->step;
1623  s32 def = cfg->def;
1624 
1625  if (name == NULL)
1626  v4l2_ctrl_fill(cfg->id, &name, &type, &min, &max, &step,
1627  &def, &flags);
1628 
1629  is_menu = (cfg->type == V4L2_CTRL_TYPE_MENU ||
1630  cfg->type == V4L2_CTRL_TYPE_INTEGER_MENU);
1631  if (is_menu)
1632  WARN_ON(step);
1633  else
1634  WARN_ON(cfg->menu_skip_mask);
1635  if (cfg->type == V4L2_CTRL_TYPE_MENU && qmenu == NULL)
1636  qmenu = v4l2_ctrl_get_menu(cfg->id);
1637  else if (cfg->type == V4L2_CTRL_TYPE_INTEGER_MENU &&
1638  qmenu_int == NULL) {
1639  handler_set_err(hdl, -EINVAL);
1640  return NULL;
1641  }
1642 
1643  ctrl = v4l2_ctrl_new(hdl, cfg->ops, cfg->id, name,
1644  type, min, max,
1645  is_menu ? cfg->menu_skip_mask : step,
1646  def, flags, qmenu, qmenu_int, priv);
1647  if (ctrl)
1648  ctrl->is_private = cfg->is_private;
1649  return ctrl;
1650 }
1651 EXPORT_SYMBOL(v4l2_ctrl_new_custom);
1652 
1653 /* Helper function for standard non-menu controls */
1654 struct v4l2_ctrl *v4l2_ctrl_new_std(struct v4l2_ctrl_handler *hdl,
1655  const struct v4l2_ctrl_ops *ops,
1656  u32 id, s32 min, s32 max, u32 step, s32 def)
1657 {
1658  const char *name;
1659  enum v4l2_ctrl_type type;
1660  u32 flags;
1661 
1662  v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
1663  if (type == V4L2_CTRL_TYPE_MENU
1664  || type == V4L2_CTRL_TYPE_INTEGER_MENU) {
1665  handler_set_err(hdl, -EINVAL);
1666  return NULL;
1667  }
1668  return v4l2_ctrl_new(hdl, ops, id, name, type,
1669  min, max, step, def, flags, NULL, NULL, NULL);
1670 }
1671 EXPORT_SYMBOL(v4l2_ctrl_new_std);
1672 
1673 /* Helper function for standard menu controls */
1674 struct v4l2_ctrl *v4l2_ctrl_new_std_menu(struct v4l2_ctrl_handler *hdl,
1675  const struct v4l2_ctrl_ops *ops,
1676  u32 id, s32 max, s32 mask, s32 def)
1677 {
1678  const char * const *qmenu = v4l2_ctrl_get_menu(id);
1679  const char *name;
1680  enum v4l2_ctrl_type type;
1681  s32 min;
1682  s32 step;
1683  u32 flags;
1684 
1685  v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
1686  if (type != V4L2_CTRL_TYPE_MENU) {
1687  handler_set_err(hdl, -EINVAL);
1688  return NULL;
1689  }
1690  return v4l2_ctrl_new(hdl, ops, id, name, type,
1691  0, max, mask, def, flags, qmenu, NULL, NULL);
1692 }
1693 EXPORT_SYMBOL(v4l2_ctrl_new_std_menu);
1694 
1695 /* Helper function for standard menu controls with driver defined menu */
1696 struct v4l2_ctrl *v4l2_ctrl_new_std_menu_items(struct v4l2_ctrl_handler *hdl,
1697  const struct v4l2_ctrl_ops *ops, u32 id, s32 max,
1698  s32 mask, s32 def, const char * const *qmenu)
1699 {
1700  enum v4l2_ctrl_type type;
1701  const char *name;
1702  u32 flags;
1703  s32 step;
1704  s32 min;
1705 
1706  /* v4l2_ctrl_new_std_menu_items() should only be called for
1707  * standard controls without a standard menu.
1708  */
1709  if (v4l2_ctrl_get_menu(id)) {
1710  handler_set_err(hdl, -EINVAL);
1711  return NULL;
1712  }
1713 
1714  v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
1715  if (type != V4L2_CTRL_TYPE_MENU || qmenu == NULL) {
1716  handler_set_err(hdl, -EINVAL);
1717  return NULL;
1718  }
1719  return v4l2_ctrl_new(hdl, ops, id, name, type, 0, max, mask, def,
1720  flags, qmenu, NULL, NULL);
1721 
1722 }
1723 EXPORT_SYMBOL(v4l2_ctrl_new_std_menu_items);
1724 
1725 /* Helper function for standard integer menu controls */
1726 struct v4l2_ctrl *v4l2_ctrl_new_int_menu(struct v4l2_ctrl_handler *hdl,
1727  const struct v4l2_ctrl_ops *ops,
1728  u32 id, s32 max, s32 def, const s64 *qmenu_int)
1729 {
1730  const char *name;
1731  enum v4l2_ctrl_type type;
1732  s32 min;
1733  s32 step;
1734  u32 flags;
1735 
1736  v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
1737  if (type != V4L2_CTRL_TYPE_INTEGER_MENU) {
1738  handler_set_err(hdl, -EINVAL);
1739  return NULL;
1740  }
1741  return v4l2_ctrl_new(hdl, ops, id, name, type,
1742  0, max, 0, def, flags, NULL, qmenu_int, NULL);
1743 }
1744 EXPORT_SYMBOL(v4l2_ctrl_new_int_menu);
1745 
1746 /* Add a control from another handler to this handler */
1747 struct v4l2_ctrl *v4l2_ctrl_add_ctrl(struct v4l2_ctrl_handler *hdl,
1748  struct v4l2_ctrl *ctrl)
1749 {
1750  if (hdl == NULL || hdl->error)
1751  return NULL;
1752  if (ctrl == NULL) {
1753  handler_set_err(hdl, -EINVAL);
1754  return NULL;
1755  }
1756  if (ctrl->handler == hdl)
1757  return ctrl;
1758  return handler_new_ref(hdl, ctrl) ? NULL : ctrl;
1759 }
1760 EXPORT_SYMBOL(v4l2_ctrl_add_ctrl);
1761 
1762 /* Add the controls from another handler to our own. */
1763 int v4l2_ctrl_add_handler(struct v4l2_ctrl_handler *hdl,
1764  struct v4l2_ctrl_handler *add,
1765  bool (*filter)(const struct v4l2_ctrl *ctrl))
1766 {
1767  struct v4l2_ctrl_ref *ref;
1768  int ret = 0;
1769 
1770  /* Do nothing if either handler is NULL or if they are the same */
1771  if (!hdl || !add || hdl == add)
1772  return 0;
1773  if (hdl->error)
1774  return hdl->error;
1775  mutex_lock(add->lock);
1776  list_for_each_entry(ref, &add->ctrl_refs, node) {
1777  struct v4l2_ctrl *ctrl = ref->ctrl;
1778 
1779  /* Skip handler-private controls. */
1780  if (ctrl->is_private)
1781  continue;
1782  /* And control classes */
1783  if (ctrl->type == V4L2_CTRL_TYPE_CTRL_CLASS)
1784  continue;
1785  /* Filter any unwanted controls */
1786  if (filter && !filter(ctrl))
1787  continue;
1788  ret = handler_new_ref(hdl, ctrl);
1789  if (ret)
1790  break;
1791  }
1792  mutex_unlock(add->lock);
1793  return ret;
1794 }
1795 EXPORT_SYMBOL(v4l2_ctrl_add_handler);
1796 
1797 bool v4l2_ctrl_radio_filter(const struct v4l2_ctrl *ctrl)
1798 {
1799  if (V4L2_CTRL_ID2CLASS(ctrl->id) == V4L2_CTRL_CLASS_FM_TX)
1800  return true;
1801  switch (ctrl->id) {
1802  case V4L2_CID_AUDIO_MUTE:
1803  case V4L2_CID_AUDIO_VOLUME:
1804  case V4L2_CID_AUDIO_BALANCE:
1805  case V4L2_CID_AUDIO_BASS:
1806  case V4L2_CID_AUDIO_TREBLE:
1807  case V4L2_CID_AUDIO_LOUDNESS:
1808  return true;
1809  default:
1810  break;
1811  }
1812  return false;
1813 }
1814 EXPORT_SYMBOL(v4l2_ctrl_radio_filter);
1815 
1816 /* Cluster controls */
1817 void v4l2_ctrl_cluster(unsigned ncontrols, struct v4l2_ctrl **controls)
1818 {
1819  bool has_volatiles = false;
1820  int i;
1821 
1822  /* The first control is the master control and it must not be NULL */
1823  BUG_ON(ncontrols == 0 || controls[0] == NULL);
1824 
1825  for (i = 0; i < ncontrols; i++) {
1826  if (controls[i]) {
1827  controls[i]->cluster = controls;
1828  controls[i]->ncontrols = ncontrols;
1829  if (controls[i]->flags & V4L2_CTRL_FLAG_VOLATILE)
1830  has_volatiles = true;
1831  }
1832  }
1833  controls[0]->has_volatiles = has_volatiles;
1834 }
1835 EXPORT_SYMBOL(v4l2_ctrl_cluster);
1836 
1837 void v4l2_ctrl_auto_cluster(unsigned ncontrols, struct v4l2_ctrl **controls,
1838  u8 manual_val, bool set_volatile)
1839 {
1840  struct v4l2_ctrl *master = controls[0];
1841  u32 flag = 0;
1842  int i;
1843 
1844  v4l2_ctrl_cluster(ncontrols, controls);
1845  WARN_ON(ncontrols <= 1);
1846  WARN_ON(manual_val < master->minimum || manual_val > master->maximum);
1847  WARN_ON(set_volatile && !has_op(master, g_volatile_ctrl));
1848  master->is_auto = true;
1849  master->has_volatiles = set_volatile;
1850  master->manual_mode_value = manual_val;
1851  master->flags |= V4L2_CTRL_FLAG_UPDATE;
1852 
1853  if (!is_cur_manual(master))
1854  flag = V4L2_CTRL_FLAG_INACTIVE |
1855  (set_volatile ? V4L2_CTRL_FLAG_VOLATILE : 0);
1856 
1857  for (i = 1; i < ncontrols; i++)
1858  if (controls[i])
1859  controls[i]->flags |= flag;
1860 }
1861 EXPORT_SYMBOL(v4l2_ctrl_auto_cluster);
1862 
1863 /* Activate/deactivate a control. */
1864 void v4l2_ctrl_activate(struct v4l2_ctrl *ctrl, bool active)
1865 {
1866  /* invert since the actual flag is called 'inactive' */
1867  bool inactive = !active;
1868  bool old;
1869 
1870  if (ctrl == NULL)
1871  return;
1872 
1873  if (inactive)
1874  /* set V4L2_CTRL_FLAG_INACTIVE */
1875  old = test_and_set_bit(4, &ctrl->flags);
1876  else
1877  /* clear V4L2_CTRL_FLAG_INACTIVE */
1878  old = test_and_clear_bit(4, &ctrl->flags);
1879  if (old != inactive)
1880  send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_FLAGS);
1881 }
1882 EXPORT_SYMBOL(v4l2_ctrl_activate);
1883 
1884 /* Grab/ungrab a control.
1885  Typically used when streaming starts and you want to grab controls,
1886  preventing the user from changing them.
1887 
1888  Just call this and the framework will block any attempts to change
1889  these controls. */
1890 void v4l2_ctrl_grab(struct v4l2_ctrl *ctrl, bool grabbed)
1891 {
1892  bool old;
1893 
1894  if (ctrl == NULL)
1895  return;
1896 
1897  v4l2_ctrl_lock(ctrl);
1898  if (grabbed)
1899  /* set V4L2_CTRL_FLAG_GRABBED */
1900  old = test_and_set_bit(1, &ctrl->flags);
1901  else
1902  /* clear V4L2_CTRL_FLAG_GRABBED */
1903  old = test_and_clear_bit(1, &ctrl->flags);
1904  if (old != grabbed)
1905  send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_FLAGS);
1906  v4l2_ctrl_unlock(ctrl);
1907 }
1908 EXPORT_SYMBOL(v4l2_ctrl_grab);
1909 
1910 /* Log the control name and value */
1911 static void log_ctrl(const struct v4l2_ctrl *ctrl,
1912  const char *prefix, const char *colon)
1913 {
1914  if (ctrl->flags & (V4L2_CTRL_FLAG_DISABLED | V4L2_CTRL_FLAG_WRITE_ONLY))
1915  return;
1916  if (ctrl->type == V4L2_CTRL_TYPE_CTRL_CLASS)
1917  return;
1918 
1919  printk(KERN_INFO "%s%s%s: ", prefix, colon, ctrl->name);
1920 
1921  switch (ctrl->type) {
1922  case V4L2_CTRL_TYPE_INTEGER:
1923  printk(KERN_CONT "%d", ctrl->cur.val);
1924  break;
1925  case V4L2_CTRL_TYPE_BOOLEAN:
1926  printk(KERN_CONT "%s", ctrl->cur.val ? "true" : "false");
1927  break;
1928  case V4L2_CTRL_TYPE_MENU:
1929  printk(KERN_CONT "%s", ctrl->qmenu[ctrl->cur.val]);
1930  break;
1931  case V4L2_CTRL_TYPE_INTEGER_MENU:
1932  printk(KERN_CONT "%lld", ctrl->qmenu_int[ctrl->cur.val]);
1933  break;
1934  case V4L2_CTRL_TYPE_BITMASK:
1935  printk(KERN_CONT "0x%08x", ctrl->cur.val);
1936  break;
1937  case V4L2_CTRL_TYPE_INTEGER64:
1938  printk(KERN_CONT "%lld", ctrl->cur.val64);
1939  break;
1940  case V4L2_CTRL_TYPE_STRING:
1941  printk(KERN_CONT "%s", ctrl->cur.string);
1942  break;
1943  default:
1944  printk(KERN_CONT "unknown type %d", ctrl->type);
1945  break;
1946  }
1947  if (ctrl->flags & (V4L2_CTRL_FLAG_INACTIVE |
1948  V4L2_CTRL_FLAG_GRABBED |
1949  V4L2_CTRL_FLAG_VOLATILE)) {
1950  if (ctrl->flags & V4L2_CTRL_FLAG_INACTIVE)
1951  printk(KERN_CONT " inactive");
1952  if (ctrl->flags & V4L2_CTRL_FLAG_GRABBED)
1953  printk(KERN_CONT " grabbed");
1954  if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE)
1955  printk(KERN_CONT " volatile");
1956  }
1957  printk(KERN_CONT "\n");
1958 }
1959 
1960 /* Log all controls owned by the handler */
1961 void v4l2_ctrl_handler_log_status(struct v4l2_ctrl_handler *hdl,
1962  const char *prefix)
1963 {
1964  struct v4l2_ctrl *ctrl;
1965  const char *colon = "";
1966  int len;
1967 
1968  if (hdl == NULL)
1969  return;
1970  if (prefix == NULL)
1971  prefix = "";
1972  len = strlen(prefix);
1973  if (len && prefix[len - 1] != ' ')
1974  colon = ": ";
1975  mutex_lock(hdl->lock);
1976  list_for_each_entry(ctrl, &hdl->ctrls, node)
1977  if (!(ctrl->flags & V4L2_CTRL_FLAG_DISABLED))
1978  log_ctrl(ctrl, prefix, colon);
1979  mutex_unlock(hdl->lock);
1980 }
1981 EXPORT_SYMBOL(v4l2_ctrl_handler_log_status);
1982 
1983 /* Call s_ctrl for all controls owned by the handler */
1984 int v4l2_ctrl_handler_setup(struct v4l2_ctrl_handler *hdl)
1985 {
1986  struct v4l2_ctrl *ctrl;
1987  int ret = 0;
1988 
1989  if (hdl == NULL)
1990  return 0;
1991  mutex_lock(hdl->lock);
1992  list_for_each_entry(ctrl, &hdl->ctrls, node)
1993  ctrl->done = false;
1994 
1995  list_for_each_entry(ctrl, &hdl->ctrls, node) {
1996  struct v4l2_ctrl *master = ctrl->cluster[0];
1997  int i;
1998 
1999  /* Skip if this control was already handled by a cluster. */
2000  /* Skip button controls and read-only controls. */
2001  if (ctrl->done || ctrl->type == V4L2_CTRL_TYPE_BUTTON ||
2002  (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY))
2003  continue;
2004 
2005  for (i = 0; i < master->ncontrols; i++) {
2006  if (master->cluster[i]) {
2007  cur_to_new(master->cluster[i]);
2008  master->cluster[i]->is_new = 1;
2009  master->cluster[i]->done = true;
2010  }
2011  }
2012  ret = call_op(master, s_ctrl);
2013  if (ret)
2014  break;
2015  }
2016  mutex_unlock(hdl->lock);
2017  return ret;
2018 }
2019 EXPORT_SYMBOL(v4l2_ctrl_handler_setup);
2020 
2021 /* Implement VIDIOC_QUERYCTRL */
2022 int v4l2_queryctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_queryctrl *qc)
2023 {
2024  u32 id = qc->id & V4L2_CTRL_ID_MASK;
2025  struct v4l2_ctrl_ref *ref;
2026  struct v4l2_ctrl *ctrl;
2027 
2028  if (hdl == NULL)
2029  return -EINVAL;
2030 
2031  mutex_lock(hdl->lock);
2032 
2033  /* Try to find it */
2034  ref = find_ref(hdl, id);
2035 
2036  if ((qc->id & V4L2_CTRL_FLAG_NEXT_CTRL) && !list_empty(&hdl->ctrl_refs)) {
2037  /* Find the next control with ID > qc->id */
2038 
2039  /* Did we reach the end of the control list? */
2040  if (id >= node2id(hdl->ctrl_refs.prev)) {
2041  ref = NULL; /* Yes, so there is no next control */
2042  } else if (ref) {
2043  /* We found a control with the given ID, so just get
2044  the next one in the list. */
2045  ref = list_entry(ref->node.next, typeof(*ref), node);
2046  } else {
2047  /* No control with the given ID exists, so start
2048  searching for the next largest ID. We know there
2049  is one, otherwise the first 'if' above would have
2050  been true. */
2051  list_for_each_entry(ref, &hdl->ctrl_refs, node)
2052  if (id < ref->ctrl->id)
2053  break;
2054  }
2055  }
2056  mutex_unlock(hdl->lock);
2057  if (!ref)
2058  return -EINVAL;
2059 
2060  ctrl = ref->ctrl;
2061  memset(qc, 0, sizeof(*qc));
2062  if (id >= V4L2_CID_PRIVATE_BASE)
2063  qc->id = id;
2064  else
2065  qc->id = ctrl->id;
2066  strlcpy(qc->name, ctrl->name, sizeof(qc->name));
2067  qc->minimum = ctrl->minimum;
2068  qc->maximum = ctrl->maximum;
2069  qc->default_value = ctrl->default_value;
2070  if (ctrl->type == V4L2_CTRL_TYPE_MENU
2071  || ctrl->type == V4L2_CTRL_TYPE_INTEGER_MENU)
2072  qc->step = 1;
2073  else
2074  qc->step = ctrl->step;
2075  qc->flags = ctrl->flags;
2076  qc->type = ctrl->type;
2077  return 0;
2078 }
2079 EXPORT_SYMBOL(v4l2_queryctrl);
2080 
2081 int v4l2_subdev_queryctrl(struct v4l2_subdev *sd, struct v4l2_queryctrl *qc)
2082 {
2083  if (qc->id & V4L2_CTRL_FLAG_NEXT_CTRL)
2084  return -EINVAL;
2085  return v4l2_queryctrl(sd->ctrl_handler, qc);
2086 }
2087 EXPORT_SYMBOL(v4l2_subdev_queryctrl);
2088 
2089 /* Implement VIDIOC_QUERYMENU */
2090 int v4l2_querymenu(struct v4l2_ctrl_handler *hdl, struct v4l2_querymenu *qm)
2091 {
2092  struct v4l2_ctrl *ctrl;
2093  u32 i = qm->index;
2094 
2095  ctrl = v4l2_ctrl_find(hdl, qm->id);
2096  if (!ctrl)
2097  return -EINVAL;
2098 
2099  qm->reserved = 0;
2100  /* Sanity checks */
2101  switch (ctrl->type) {
2102  case V4L2_CTRL_TYPE_MENU:
2103  if (ctrl->qmenu == NULL)
2104  return -EINVAL;
2105  break;
2106  case V4L2_CTRL_TYPE_INTEGER_MENU:
2107  if (ctrl->qmenu_int == NULL)
2108  return -EINVAL;
2109  break;
2110  default:
2111  return -EINVAL;
2112  }
2113 
2114  if (i < ctrl->minimum || i > ctrl->maximum)
2115  return -EINVAL;
2116 
2117  /* Use mask to see if this menu item should be skipped */
2118  if (ctrl->menu_skip_mask & (1 << i))
2119  return -EINVAL;
2120  /* Empty menu items should also be skipped */
2121  if (ctrl->type == V4L2_CTRL_TYPE_MENU) {
2122  if (ctrl->qmenu[i] == NULL || ctrl->qmenu[i][0] == '\0')
2123  return -EINVAL;
2124  strlcpy(qm->name, ctrl->qmenu[i], sizeof(qm->name));
2125  } else {
2126  qm->value = ctrl->qmenu_int[i];
2127  }
2128  return 0;
2129 }
2130 EXPORT_SYMBOL(v4l2_querymenu);
2131 
2132 int v4l2_subdev_querymenu(struct v4l2_subdev *sd, struct v4l2_querymenu *qm)
2133 {
2134  return v4l2_querymenu(sd->ctrl_handler, qm);
2135 }
2136 EXPORT_SYMBOL(v4l2_subdev_querymenu);
2137 
2138 
2139 
2140 /* Some general notes on the atomic requirements of VIDIOC_G/TRY/S_EXT_CTRLS:
2141 
2142  It is not a fully atomic operation, just best-effort only. After all, if
2143  multiple controls have to be set through multiple i2c writes (for example)
2144  then some initial writes may succeed while others fail. Thus leaving the
2145  system in an inconsistent state. The question is how much effort you are
2146  willing to spend on trying to make something atomic that really isn't.
2147 
2148  From the point of view of an application the main requirement is that
2149  when you call VIDIOC_S_EXT_CTRLS and some values are invalid then an
2150  error should be returned without actually affecting any controls.
2151 
2152  If all the values are correct, then it is acceptable to just give up
2153  in case of low-level errors.
2154 
2155  It is important though that the application can tell when only a partial
2156  configuration was done. The way we do that is through the error_idx field
2157  of struct v4l2_ext_controls: if that is equal to the count field then no
2158  controls were affected. Otherwise all controls before that index were
2159  successful in performing their 'get' or 'set' operation, the control at
2160  the given index failed, and you don't know what happened with the controls
2161  after the failed one. Since if they were part of a control cluster they
2162  could have been successfully processed (if a cluster member was encountered
2163  at index < error_idx), they could have failed (if a cluster member was at
2164  error_idx), or they may not have been processed yet (if the first cluster
2165  member appeared after error_idx).
2166 
2167  It is all fairly theoretical, though. In practice all you can do is to
2168  bail out. If error_idx == count, then it is an application bug. If
2169  error_idx < count then it is only an application bug if the error code was
2170  EBUSY. That usually means that something started streaming just when you
2171  tried to set the controls. In all other cases it is a driver/hardware
2172  problem and all you can do is to retry or bail out.
2173 
2174  Note that these rules do not apply to VIDIOC_TRY_EXT_CTRLS: since that
2175  never modifies controls the error_idx is just set to whatever control
2176  has an invalid value.
2177  */
2178 
2179 /* Prepare for the extended g/s/try functions.
2180  Find the controls in the control array and do some basic checks. */
2181 static int prepare_ext_ctrls(struct v4l2_ctrl_handler *hdl,
2182  struct v4l2_ext_controls *cs,
2183  struct v4l2_ctrl_helper *helpers)
2184 {
2185  struct v4l2_ctrl_helper *h;
2186  bool have_clusters = false;
2187  u32 i;
2188 
2189  for (i = 0, h = helpers; i < cs->count; i++, h++) {
2190  struct v4l2_ext_control *c = &cs->controls[i];
2191  struct v4l2_ctrl_ref *ref;
2192  struct v4l2_ctrl *ctrl;
2193  u32 id = c->id & V4L2_CTRL_ID_MASK;
2194 
2195  cs->error_idx = i;
2196 
2197  if (cs->ctrl_class && V4L2_CTRL_ID2CLASS(id) != cs->ctrl_class)
2198  return -EINVAL;
2199 
2200  /* Old-style private controls are not allowed for
2201  extended controls */
2202  if (id >= V4L2_CID_PRIVATE_BASE)
2203  return -EINVAL;
2204  ref = find_ref_lock(hdl, id);
2205  if (ref == NULL)
2206  return -EINVAL;
2207  ctrl = ref->ctrl;
2208  if (ctrl->flags & V4L2_CTRL_FLAG_DISABLED)
2209  return -EINVAL;
2210 
2211  if (ctrl->cluster[0]->ncontrols > 1)
2212  have_clusters = true;
2213  if (ctrl->cluster[0] != ctrl)
2214  ref = find_ref_lock(hdl, ctrl->cluster[0]->id);
2215  /* Store the ref to the master control of the cluster */
2216  h->mref = ref;
2217  h->ctrl = ctrl;
2218  /* Initially set next to 0, meaning that there is no other
2219  control in this helper array belonging to the same
2220  cluster */
2221  h->next = 0;
2222  }
2223 
2224  /* We are done if there were no controls that belong to a multi-
2225  control cluster. */
2226  if (!have_clusters)
2227  return 0;
2228 
2229  /* The code below figures out in O(n) time which controls in the list
2230  belong to the same cluster. */
2231 
2232  /* This has to be done with the handler lock taken. */
2233  mutex_lock(hdl->lock);
2234 
2235  /* First zero the helper field in the master control references */
2236  for (i = 0; i < cs->count; i++)
2237  helpers[i].mref->helper = NULL;
2238  for (i = 0, h = helpers; i < cs->count; i++, h++) {
2239  struct v4l2_ctrl_ref *mref = h->mref;
2240 
2241  /* If the mref->helper is set, then it points to an earlier
2242  helper that belongs to the same cluster. */
2243  if (mref->helper) {
2244  /* Set the next field of mref->helper to the current
2245  index: this means that that earlier helper now
2246  points to the next helper in the same cluster. */
2247  mref->helper->next = i;
2248  /* mref should be set only for the first helper in the
2249  cluster, clear the others. */
2250  h->mref = NULL;
2251  }
2252  /* Point the mref helper to the current helper struct. */
2253  mref->helper = h;
2254  }
2255  mutex_unlock(hdl->lock);
2256  return 0;
2257 }
2258 
2259 /* Handles the corner case where cs->count == 0. It checks whether the
2260  specified control class exists. If that class ID is 0, then it checks
2261  whether there are any controls at all. */
2262 static int class_check(struct v4l2_ctrl_handler *hdl, u32 ctrl_class)
2263 {
2264  if (ctrl_class == 0)
2265  return list_empty(&hdl->ctrl_refs) ? -EINVAL : 0;
2266  return find_ref_lock(hdl, ctrl_class | 1) ? 0 : -EINVAL;
2267 }
2268 
2269 
2270 
2271 /* Get extended controls. Allocates the helpers array if needed. */
2272 int v4l2_g_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *cs)
2273 {
2274  struct v4l2_ctrl_helper helper[4];
2275  struct v4l2_ctrl_helper *helpers = helper;
2276  int ret;
2277  int i, j;
2278 
2279  cs->error_idx = cs->count;
2280  cs->ctrl_class = V4L2_CTRL_ID2CLASS(cs->ctrl_class);
2281 
2282  if (hdl == NULL)
2283  return -EINVAL;
2284 
2285  if (cs->count == 0)
2286  return class_check(hdl, cs->ctrl_class);
2287 
2288  if (cs->count > ARRAY_SIZE(helper)) {
2289  helpers = kmalloc_array(cs->count, sizeof(helper[0]),
2290  GFP_KERNEL);
2291  if (helpers == NULL)
2292  return -ENOMEM;
2293  }
2294 
2295  ret = prepare_ext_ctrls(hdl, cs, helpers);
2296  cs->error_idx = cs->count;
2297 
2298  for (i = 0; !ret && i < cs->count; i++)
2299  if (helpers[i].ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY)
2300  ret = -EACCES;
2301 
2302  for (i = 0; !ret && i < cs->count; i++) {
2303  int (*ctrl_to_user)(struct v4l2_ext_control *c,
2304  struct v4l2_ctrl *ctrl) = cur_to_user;
2305  struct v4l2_ctrl *master;
2306 
2307  if (helpers[i].mref == NULL)
2308  continue;
2309 
2310  master = helpers[i].mref->ctrl;
2311  cs->error_idx = i;
2312 
2313  v4l2_ctrl_lock(master);
2314 
2315  /* g_volatile_ctrl will update the new control values */
2316  if ((master->flags & V4L2_CTRL_FLAG_VOLATILE) ||
2317  (master->has_volatiles && !is_cur_manual(master))) {
2318  for (j = 0; j < master->ncontrols; j++)
2319  cur_to_new(master->cluster[j]);
2320  ret = call_op(master, g_volatile_ctrl);
2321  ctrl_to_user = new_to_user;
2322  }
2323  /* If OK, then copy the current (for non-volatile controls)
2324  or the new (for volatile controls) control values to the
2325  caller */
2326  if (!ret) {
2327  u32 idx = i;
2328 
2329  do {
2330  ret = ctrl_to_user(cs->controls + idx,
2331  helpers[idx].ctrl);
2332  idx = helpers[idx].next;
2333  } while (!ret && idx);
2334  }
2335  v4l2_ctrl_unlock(master);
2336  }
2337 
2338  if (cs->count > ARRAY_SIZE(helper))
2339  kfree(helpers);
2340  return ret;
2341 }
2342 EXPORT_SYMBOL(v4l2_g_ext_ctrls);
2343 
2344 int v4l2_subdev_g_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs)
2345 {
2346  return v4l2_g_ext_ctrls(sd->ctrl_handler, cs);
2347 }
2348 EXPORT_SYMBOL(v4l2_subdev_g_ext_ctrls);
2349 
2350 /* Helper function to get a single control */
2351 static int get_ctrl(struct v4l2_ctrl *ctrl, struct v4l2_ext_control *c)
2352 {
2353  struct v4l2_ctrl *master = ctrl->cluster[0];
2354  int ret = 0;
2355  int i;
2356 
2357  /* String controls are not supported. The new_to_user() and
2358  * cur_to_user() calls below would need to be modified not to access
2359  * userspace memory when called from get_ctrl().
2360  */
2361  if (ctrl->type == V4L2_CTRL_TYPE_STRING)
2362  return -EINVAL;
2363 
2364  if (ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY)
2365  return -EACCES;
2366 
2367  v4l2_ctrl_lock(master);
2368  /* g_volatile_ctrl will update the current control values */
2369  if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE) {
2370  for (i = 0; i < master->ncontrols; i++)
2371  cur_to_new(master->cluster[i]);
2372  ret = call_op(master, g_volatile_ctrl);
2373  new_to_user(c, ctrl);
2374  } else {
2375  cur_to_user(c, ctrl);
2376  }
2377  v4l2_ctrl_unlock(master);
2378  return ret;
2379 }
2380 
2381 int v4l2_g_ctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_control *control)
2382 {
2383  struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, control->id);
2384  struct v4l2_ext_control c;
2385  int ret;
2386 
2387  if (ctrl == NULL || !type_is_int(ctrl))
2388  return -EINVAL;
2389  ret = get_ctrl(ctrl, &c);
2390  control->value = c.value;
2391  return ret;
2392 }
2393 EXPORT_SYMBOL(v4l2_g_ctrl);
2394 
2395 int v4l2_subdev_g_ctrl(struct v4l2_subdev *sd, struct v4l2_control *control)
2396 {
2397  return v4l2_g_ctrl(sd->ctrl_handler, control);
2398 }
2399 EXPORT_SYMBOL(v4l2_subdev_g_ctrl);
2400 
2401 s32 v4l2_ctrl_g_ctrl(struct v4l2_ctrl *ctrl)
2402 {
2403  struct v4l2_ext_control c;
2404 
2405  /* It's a driver bug if this happens. */
2406  WARN_ON(!type_is_int(ctrl));
2407  c.value = 0;
2408  get_ctrl(ctrl, &c);
2409  return c.value;
2410 }
2411 EXPORT_SYMBOL(v4l2_ctrl_g_ctrl);
2412 
2413 s64 v4l2_ctrl_g_ctrl_int64(struct v4l2_ctrl *ctrl)
2414 {
2415  struct v4l2_ext_control c;
2416 
2417  /* It's a driver bug if this happens. */
2418  WARN_ON(ctrl->type != V4L2_CTRL_TYPE_INTEGER64);
2419  c.value = 0;
2420  get_ctrl(ctrl, &c);
2421  return c.value;
2422 }
2423 EXPORT_SYMBOL(v4l2_ctrl_g_ctrl_int64);
2424 
2425 
2426 /* Core function that calls try/s_ctrl and ensures that the new value is
2427  copied to the current value on a set.
2428  Must be called with ctrl->handler->lock held. */
2429 static int try_or_set_cluster(struct v4l2_fh *fh,
2430  struct v4l2_ctrl *master, bool set)
2431 {
2432  bool update_flag;
2433  int ret;
2434  int i;
2435 
2436  /* Go through the cluster and either validate the new value or
2437  (if no new value was set), copy the current value to the new
2438  value, ensuring a consistent view for the control ops when
2439  called. */
2440  for (i = 0; i < master->ncontrols; i++) {
2441  struct v4l2_ctrl *ctrl = master->cluster[i];
2442 
2443  if (ctrl == NULL)
2444  continue;
2445 
2446  if (!ctrl->is_new) {
2447  cur_to_new(ctrl);
2448  continue;
2449  }
2450  /* Check again: it may have changed since the
2451  previous check in try_or_set_ext_ctrls(). */
2452  if (set && (ctrl->flags & V4L2_CTRL_FLAG_GRABBED))
2453  return -EBUSY;
2454  }
2455 
2456  ret = call_op(master, try_ctrl);
2457 
2458  /* Don't set if there is no change */
2459  if (ret || !set || !cluster_changed(master))
2460  return ret;
2461  ret = call_op(master, s_ctrl);
2462  if (ret)
2463  return ret;
2464 
2465  /* If OK, then make the new values permanent. */
2466  update_flag = is_cur_manual(master) != is_new_manual(master);
2467  for (i = 0; i < master->ncontrols; i++)
2468  new_to_cur(fh, master->cluster[i], update_flag && i > 0);
2469  return 0;
2470 }
2471 
2472 /* Validate controls. */
2473 static int validate_ctrls(struct v4l2_ext_controls *cs,
2474  struct v4l2_ctrl_helper *helpers, bool set)
2475 {
2476  unsigned i;
2477  int ret = 0;
2478 
2479  cs->error_idx = cs->count;
2480  for (i = 0; i < cs->count; i++) {
2481  struct v4l2_ctrl *ctrl = helpers[i].ctrl;
2482 
2483  cs->error_idx = i;
2484 
2485  if (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY)
2486  return -EACCES;
2487  /* This test is also done in try_set_control_cluster() which
2488  is called in atomic context, so that has the final say,
2489  but it makes sense to do an up-front check as well. Once
2490  an error occurs in try_set_control_cluster() some other
2491  controls may have been set already and we want to do a
2492  best-effort to avoid that. */
2493  if (set && (ctrl->flags & V4L2_CTRL_FLAG_GRABBED))
2494  return -EBUSY;
2495  ret = validate_new(ctrl, &cs->controls[i]);
2496  if (ret)
2497  return ret;
2498  }
2499  return 0;
2500 }
2501 
2502 /* Obtain the current volatile values of an autocluster and mark them
2503  as new. */
2504 static void update_from_auto_cluster(struct v4l2_ctrl *master)
2505 {
2506  int i;
2507 
2508  for (i = 0; i < master->ncontrols; i++)
2509  cur_to_new(master->cluster[i]);
2510  if (!call_op(master, g_volatile_ctrl))
2511  for (i = 1; i < master->ncontrols; i++)
2512  if (master->cluster[i])
2513  master->cluster[i]->is_new = 1;
2514 }
2515 
2516 /* Try or try-and-set controls */
2517 static int try_set_ext_ctrls(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
2518  struct v4l2_ext_controls *cs,
2519  bool set)
2520 {
2521  struct v4l2_ctrl_helper helper[4];
2522  struct v4l2_ctrl_helper *helpers = helper;
2523  unsigned i, j;
2524  int ret;
2525 
2526  cs->error_idx = cs->count;
2527  cs->ctrl_class = V4L2_CTRL_ID2CLASS(cs->ctrl_class);
2528 
2529  if (hdl == NULL)
2530  return -EINVAL;
2531 
2532  if (cs->count == 0)
2533  return class_check(hdl, cs->ctrl_class);
2534 
2535  if (cs->count > ARRAY_SIZE(helper)) {
2536  helpers = kmalloc_array(cs->count, sizeof(helper[0]),
2537  GFP_KERNEL);
2538  if (!helpers)
2539  return -ENOMEM;
2540  }
2541  ret = prepare_ext_ctrls(hdl, cs, helpers);
2542  if (!ret)
2543  ret = validate_ctrls(cs, helpers, set);
2544  if (ret && set)
2545  cs->error_idx = cs->count;
2546  for (i = 0; !ret && i < cs->count; i++) {
2547  struct v4l2_ctrl *master;
2548  u32 idx = i;
2549 
2550  if (helpers[i].mref == NULL)
2551  continue;
2552 
2553  cs->error_idx = i;
2554  master = helpers[i].mref->ctrl;
2555  v4l2_ctrl_lock(master);
2556 
2557  /* Reset the 'is_new' flags of the cluster */
2558  for (j = 0; j < master->ncontrols; j++)
2559  if (master->cluster[j])
2560  master->cluster[j]->is_new = 0;
2561 
2562  /* For volatile autoclusters that are currently in auto mode
2563  we need to discover if it will be set to manual mode.
2564  If so, then we have to copy the current volatile values
2565  first since those will become the new manual values (which
2566  may be overwritten by explicit new values from this set
2567  of controls). */
2568  if (master->is_auto && master->has_volatiles &&
2569  !is_cur_manual(master)) {
2570  /* Pick an initial non-manual value */
2571  s32 new_auto_val = master->manual_mode_value + 1;
2572  u32 tmp_idx = idx;
2573 
2574  do {
2575  /* Check if the auto control is part of the
2576  list, and remember the new value. */
2577  if (helpers[tmp_idx].ctrl == master)
2578  new_auto_val = cs->controls[tmp_idx].value;
2579  tmp_idx = helpers[tmp_idx].next;
2580  } while (tmp_idx);
2581  /* If the new value == the manual value, then copy
2582  the current volatile values. */
2583  if (new_auto_val == master->manual_mode_value)
2584  update_from_auto_cluster(master);
2585  }
2586 
2587  /* Copy the new caller-supplied control values.
2588  user_to_new() sets 'is_new' to 1. */
2589  do {
2590  ret = user_to_new(cs->controls + idx, helpers[idx].ctrl);
2591  idx = helpers[idx].next;
2592  } while (!ret && idx);
2593 
2594  if (!ret)
2595  ret = try_or_set_cluster(fh, master, set);
2596 
2597  /* Copy the new values back to userspace. */
2598  if (!ret) {
2599  idx = i;
2600  do {
2601  ret = new_to_user(cs->controls + idx,
2602  helpers[idx].ctrl);
2603  idx = helpers[idx].next;
2604  } while (!ret && idx);
2605  }
2606  v4l2_ctrl_unlock(master);
2607  }
2608 
2609  if (cs->count > ARRAY_SIZE(helper))
2610  kfree(helpers);
2611  return ret;
2612 }
2613 
2614 int v4l2_try_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *cs)
2615 {
2616  return try_set_ext_ctrls(NULL, hdl, cs, false);
2617 }
2618 EXPORT_SYMBOL(v4l2_try_ext_ctrls);
2619 
2620 int v4l2_s_ext_ctrls(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
2621  struct v4l2_ext_controls *cs)
2622 {
2623  return try_set_ext_ctrls(fh, hdl, cs, true);
2624 }
2625 EXPORT_SYMBOL(v4l2_s_ext_ctrls);
2626 
2627 int v4l2_subdev_try_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs)
2628 {
2629  return try_set_ext_ctrls(NULL, sd->ctrl_handler, cs, false);
2630 }
2631 EXPORT_SYMBOL(v4l2_subdev_try_ext_ctrls);
2632 
2633 int v4l2_subdev_s_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs)
2634 {
2635  return try_set_ext_ctrls(NULL, sd->ctrl_handler, cs, true);
2636 }
2637 EXPORT_SYMBOL(v4l2_subdev_s_ext_ctrls);
2638 
2639 /* Helper function for VIDIOC_S_CTRL compatibility */
2640 static int set_ctrl(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl,
2641  struct v4l2_ext_control *c)
2642 {
2643  struct v4l2_ctrl *master = ctrl->cluster[0];
2644  int ret;
2645  int i;
2646 
2647  /* String controls are not supported. The user_to_new() and
2648  * cur_to_user() calls below would need to be modified not to access
2649  * userspace memory when called from set_ctrl().
2650  */
2651  if (ctrl->type == V4L2_CTRL_TYPE_STRING)
2652  return -EINVAL;
2653 
2654  ret = validate_new(ctrl, c);
2655  if (ret)
2656  return ret;
2657 
2658  v4l2_ctrl_lock(ctrl);
2659 
2660  /* Reset the 'is_new' flags of the cluster */
2661  for (i = 0; i < master->ncontrols; i++)
2662  if (master->cluster[i])
2663  master->cluster[i]->is_new = 0;
2664 
2665  /* For autoclusters with volatiles that are switched from auto to
2666  manual mode we have to update the current volatile values since
2667  those will become the initial manual values after such a switch. */
2668  if (master->is_auto && master->has_volatiles && ctrl == master &&
2669  !is_cur_manual(master) && c->value == master->manual_mode_value)
2670  update_from_auto_cluster(master);
2671 
2672  user_to_new(c, ctrl);
2673  ret = try_or_set_cluster(fh, master, true);
2674  cur_to_user(c, ctrl);
2675 
2676  v4l2_ctrl_unlock(ctrl);
2677  return ret;
2678 }
2679 
2680 int v4l2_s_ctrl(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
2681  struct v4l2_control *control)
2682 {
2683  struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, control->id);
2684  struct v4l2_ext_control c;
2685  int ret;
2686 
2687  if (ctrl == NULL || !type_is_int(ctrl))
2688  return -EINVAL;
2689 
2690  if (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY)
2691  return -EACCES;
2692 
2693  c.value = control->value;
2694  ret = set_ctrl(fh, ctrl, &c);
2695  control->value = c.value;
2696  return ret;
2697 }
2698 EXPORT_SYMBOL(v4l2_s_ctrl);
2699 
2700 int v4l2_subdev_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *control)
2701 {
2702  return v4l2_s_ctrl(NULL, sd->ctrl_handler, control);
2703 }
2704 EXPORT_SYMBOL(v4l2_subdev_s_ctrl);
2705 
2706 int v4l2_ctrl_s_ctrl(struct v4l2_ctrl *ctrl, s32 val)
2707 {
2708  struct v4l2_ext_control c;
2709 
2710  /* It's a driver bug if this happens. */
2711  WARN_ON(!type_is_int(ctrl));
2712  c.value = val;
2713  return set_ctrl(NULL, ctrl, &c);
2714 }
2715 EXPORT_SYMBOL(v4l2_ctrl_s_ctrl);
2716 
2717 int v4l2_ctrl_s_ctrl_int64(struct v4l2_ctrl *ctrl, s64 val)
2718 {
2719  struct v4l2_ext_control c;
2720 
2721  /* It's a driver bug if this happens. */
2722  WARN_ON(ctrl->type != V4L2_CTRL_TYPE_INTEGER64);
2723  c.value64 = val;
2724  return set_ctrl(NULL, ctrl, &c);
2725 }
2726 EXPORT_SYMBOL(v4l2_ctrl_s_ctrl_int64);
2727 
2728 static int v4l2_ctrl_add_event(struct v4l2_subscribed_event *sev, unsigned elems)
2729 {
2730  struct v4l2_ctrl *ctrl = v4l2_ctrl_find(sev->fh->ctrl_handler, sev->id);
2731 
2732  if (ctrl == NULL)
2733  return -EINVAL;
2734 
2735  v4l2_ctrl_lock(ctrl);
2736  list_add_tail(&sev->node, &ctrl->ev_subs);
2737  if (ctrl->type != V4L2_CTRL_TYPE_CTRL_CLASS &&
2738  (sev->flags & V4L2_EVENT_SUB_FL_SEND_INITIAL)) {
2739  struct v4l2_event ev;
2740  u32 changes = V4L2_EVENT_CTRL_CH_FLAGS;
2741 
2742  if (!(ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY))
2743  changes |= V4L2_EVENT_CTRL_CH_VALUE;
2744  fill_event(&ev, ctrl, changes);
2745  /* Mark the queue as active, allowing this initial
2746  event to be accepted. */
2747  sev->elems = elems;
2748  v4l2_event_queue_fh(sev->fh, &ev);
2749  }
2750  v4l2_ctrl_unlock(ctrl);
2751  return 0;
2752 }
2753 
2754 static void v4l2_ctrl_del_event(struct v4l2_subscribed_event *sev)
2755 {
2756  struct v4l2_ctrl *ctrl = v4l2_ctrl_find(sev->fh->ctrl_handler, sev->id);
2757 
2758  v4l2_ctrl_lock(ctrl);
2759  list_del(&sev->node);
2760  v4l2_ctrl_unlock(ctrl);
2761 }
2762 
2763 void v4l2_ctrl_replace(struct v4l2_event *old, const struct v4l2_event *new)
2764 {
2765  u32 old_changes = old->u.ctrl.changes;
2766 
2767  old->u.ctrl = new->u.ctrl;
2768  old->u.ctrl.changes |= old_changes;
2769 }
2770 EXPORT_SYMBOL(v4l2_ctrl_replace);
2771 
2772 void v4l2_ctrl_merge(const struct v4l2_event *old, struct v4l2_event *new)
2773 {
2774  new->u.ctrl.changes |= old->u.ctrl.changes;
2775 }
2776 EXPORT_SYMBOL(v4l2_ctrl_merge);
2777 
2778 const struct v4l2_subscribed_event_ops v4l2_ctrl_sub_ev_ops = {
2779  .add = v4l2_ctrl_add_event,
2780  .del = v4l2_ctrl_del_event,
2781  .replace = v4l2_ctrl_replace,
2782  .merge = v4l2_ctrl_merge,
2783 };
2784 EXPORT_SYMBOL(v4l2_ctrl_sub_ev_ops);
2785 
2786 int v4l2_ctrl_log_status(struct file *file, void *fh)
2787 {
2788  struct video_device *vfd = video_devdata(file);
2789  struct v4l2_fh *vfh = file->private_data;
2790 
2791  if (test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags) && vfd->v4l2_dev)
2792  v4l2_ctrl_handler_log_status(vfh->ctrl_handler,
2793  vfd->v4l2_dev->name);
2794  return 0;
2795 }
2796 EXPORT_SYMBOL(v4l2_ctrl_log_status);
2797 
2798 int v4l2_ctrl_subscribe_event(struct v4l2_fh *fh,
2799  const struct v4l2_event_subscription *sub)
2800 {
2801  if (sub->type == V4L2_EVENT_CTRL)
2802  return v4l2_event_subscribe(fh, sub, 0, &v4l2_ctrl_sub_ev_ops);
2803  return -EINVAL;
2804 }
2805 EXPORT_SYMBOL(v4l2_ctrl_subscribe_event);
2806 
2807 unsigned int v4l2_ctrl_poll(struct file *file, struct poll_table_struct *wait)
2808 {
2809  struct v4l2_fh *fh = file->private_data;
2810 
2811  if (v4l2_event_pending(fh))
2812  return POLLPRI;
2813  poll_wait(file, &fh->wait, wait);
2814  return 0;
2815 }
2816 EXPORT_SYMBOL(v4l2_ctrl_poll);
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