drivers/media/video/v4l2-ctrls.c

   1 /*
   2     V4L2 controls framework implementation.
   3
   4     Copyright (C) 2010  Hans Verkuil <hverkuil@xs4all.nl>
   5
   6     This program is free software; you can redistribute it and/or modify
   7     it under the terms of the GNU General Public License as published by
   8     the Free Software Foundation; either version 2 of the License, or
   9     (at your option) any later version.
  10
  11     This program is distributed in the hope that it will be useful,
  12     but WITHOUT ANY WARRANTY; without even the implied warranty of
  13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14     GNU General Public License for more details.
  15
  16     You should have received a copy of the GNU General Public License
  17     along with this program; if not, write to the Free Software
  18     Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21 #include <linux/ctype.h>
  22 #include <linux/slab.h>
  23 #include <media/v4l2-ioctl.h>
  24 #include <media/v4l2-device.h>
  25 #include <media/v4l2-ctrls.h>
  26 #include <media/v4l2-event.h>
  27 #include <media/v4l2-dev.h>
  28
  29 #define has_op(master, op) \
  30         (master->ops && master->ops->op)
  31 #define call_op(master, op) \
  32         (has_op(master, op) ? master->ops->op(master) : 0)
  33
  34 /* Internal temporary helper struct, one for each v4l2_ext_control */
  35 struct ctrl_helper {
  36         /* The control corresponding to the v4l2_ext_control ID field. */
  37         struct v4l2_ctrl *ctrl;
  38         /* Used internally to mark whether this control was already
  39            processed. */
  40         bool handled;
  41 };
  42
  43 /* Small helper function to determine if the autocluster is set to manual
  44    mode. In that case the is_volatile flag should be ignored. */
  45 static bool is_cur_manual(const struct v4l2_ctrl *master)
  46 {
  47         return master->is_auto && master->cur.val == master->manual_mode_value;
  48 }
  49
  50 /* Same as above, but this checks the against the new value instead of the
  51    current value. */
  52 static bool is_new_manual(const struct v4l2_ctrl *master)
  53 {
  54         return master->is_auto && master->val == master->manual_mode_value;
  55 }
  56
  57 /* Returns NULL or a character pointer array containing the menu for
  58    the given control ID. The pointer array ends with a NULL pointer.
  59    An empty string signifies a menu entry that is invalid. This allows
  60    drivers to disable certain options if it is not supported. */
  61 const char * const *v4l2_ctrl_get_menu(u32 id)
  62 {
  63         static const char * const mpeg_audio_sampling_freq[] = {
  64                 "44.1 kHz",
  65                 "48 kHz",
  66                 "32 kHz",
  67                 NULL
  68         };
  69         static const char * const mpeg_audio_encoding[] = {
  70                 "MPEG-1/2 Layer I",
  71                 "MPEG-1/2 Layer II",
  72                 "MPEG-1/2 Layer III",
  73                 "MPEG-2/4 AAC",
  74                 "AC-3",
  75                 NULL
  76         };
  77         static const char * const mpeg_audio_l1_bitrate[] = {
  78                 "32 kbps",
  79                 "64 kbps",
  80                 "96 kbps",
  81                 "128 kbps",
  82                 "160 kbps",
  83                 "192 kbps",
  84                 "224 kbps",
  85                 "256 kbps",
  86                 "288 kbps",
  87                 "320 kbps",
  88                 "352 kbps",
  89                 "384 kbps",
  90                 "416 kbps",
  91                 "448 kbps",
  92                 NULL
  93         };
  94         static const char * const mpeg_audio_l2_bitrate[] = {
  95                 "32 kbps",
  96                 "48 kbps",
  97                 "56 kbps",
  98                 "64 kbps",
  99                 "80 kbps",
 100                 "96 kbps",
 101                 "112 kbps",
 102                 "128 kbps",
 103                 "160 kbps",
 104                 "192 kbps",
 105                 "224 kbps",
 106                 "256 kbps",
 107                 "320 kbps",
 108                 "384 kbps",
 109                 NULL
 110         };
 111         static const char * const mpeg_audio_l3_bitrate[] = {
 112                 "32 kbps",
 113                 "40 kbps",
 114                 "48 kbps",
 115                 "56 kbps",
 116                 "64 kbps",
 117                 "80 kbps",
 118                 "96 kbps",
 119                 "112 kbps",
 120                 "128 kbps",
 121                 "160 kbps",
 122                 "192 kbps",
 123                 "224 kbps",
 124                 "256 kbps",
 125                 "320 kbps",
 126                 NULL
 127         };
 128         static const char * const mpeg_audio_ac3_bitrate[] = {
 129                 "32 kbps",
 130                 "40 kbps",
 131                 "48 kbps",
 132                 "56 kbps",
 133                 "64 kbps",
 134                 "80 kbps",
 135                 "96 kbps",
 136                 "112 kbps",
 137                 "128 kbps",
 138                 "160 kbps",
 139                 "192 kbps",
 140                 "224 kbps",
 141                 "256 kbps",
 142                 "320 kbps",
 143                 "384 kbps",
 144                 "448 kbps",
 145                 "512 kbps",
 146                 "576 kbps",
 147                 "640 kbps",
 148                 NULL
 149         };
 150         static const char * const mpeg_audio_mode[] = {
 151                 "Stereo",
 152                 "Joint Stereo",
 153                 "Dual",
 154                 "Mono",
 155                 NULL
 156         };
 157         static const char * const mpeg_audio_mode_extension[] = {
 158                 "Bound 4",
 159                 "Bound 8",
 160                 "Bound 12",
 161                 "Bound 16",
 162                 NULL
 163         };
 164         static const char * const mpeg_audio_emphasis[] = {
 165                 "No Emphasis",
 166                 "50/15 us",
 167                 "CCITT J17",
 168                 NULL
 169         };
 170         static const char * const mpeg_audio_crc[] = {
 171                 "No CRC",
 172                 "16-bit CRC",
 173                 NULL
 174         };
 175         static const char * const mpeg_video_encoding[] = {
 176                 "MPEG-1",
 177                 "MPEG-2",
 178                 "MPEG-4 AVC",
 179                 NULL
 180         };
 181         static const char * const mpeg_video_aspect[] = {
 182                 "1x1",
 183                 "4x3",
 184                 "16x9",
 185                 "2.21x1",
 186                 NULL
 187         };
 188         static const char * const mpeg_video_bitrate_mode[] = {
 189                 "Variable Bitrate",
 190                 "Constant Bitrate",
 191                 NULL
 192         };
 193         static const char * const mpeg_stream_type[] = {
 194                 "MPEG-2 Program Stream",
 195                 "MPEG-2 Transport Stream",
 196                 "MPEG-1 System Stream",
 197                 "MPEG-2 DVD-compatible Stream",
 198                 "MPEG-1 VCD-compatible Stream",
 199                 "MPEG-2 SVCD-compatible Stream",
 200                 NULL
 201         };
 202         static const char * const mpeg_stream_vbi_fmt[] = {
 203                 "No VBI",
 204                 "Private packet, IVTV format",
 205                 NULL
 206         };
 207         static const char * const camera_power_line_frequency[] = {
 208                 "Disabled",
 209                 "50 Hz",
 210                 "60 Hz",
 211                 NULL
 212         };
 213         static const char * const camera_exposure_auto[] = {
 214                 "Auto Mode",
 215                 "Manual Mode",
 216                 "Shutter Priority Mode",
 217                 "Aperture Priority Mode",
 218                 NULL
 219         };
 220         static const char * const colorfx[] = {
 221                 "None",
 222                 "Black & White",
 223                 "Sepia",
 224                 "Negative",
 225                 "Emboss",
 226                 "Sketch",
 227                 "Sky blue",
 228                 "Grass green",
 229                 "Skin whiten",
 230                 "Vivid",
 231                 NULL
 232         };
 233         static const char * const tune_preemphasis[] = {
 234                 "No preemphasis",
 235                 "50 useconds",
 236                 "75 useconds",
 237                 NULL,
 238         };
 239
 240         switch (id) {
 241         case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ:
 242                 return mpeg_audio_sampling_freq;
 243         case V4L2_CID_MPEG_AUDIO_ENCODING:
 244                 return mpeg_audio_encoding;
 245         case V4L2_CID_MPEG_AUDIO_L1_BITRATE:
 246                 return mpeg_audio_l1_bitrate;
 247         case V4L2_CID_MPEG_AUDIO_L2_BITRATE:
 248                 return mpeg_audio_l2_bitrate;
 249         case V4L2_CID_MPEG_AUDIO_L3_BITRATE:
 250                 return mpeg_audio_l3_bitrate;
 251         case V4L2_CID_MPEG_AUDIO_AC3_BITRATE:
 252                 return mpeg_audio_ac3_bitrate;
 253         case V4L2_CID_MPEG_AUDIO_MODE:
 254                 return mpeg_audio_mode;
 255         case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION:
 256                 return mpeg_audio_mode_extension;
 257         case V4L2_CID_MPEG_AUDIO_EMPHASIS:
 258                 return mpeg_audio_emphasis;
 259         case V4L2_CID_MPEG_AUDIO_CRC:
 260                 return mpeg_audio_crc;
 261         case V4L2_CID_MPEG_VIDEO_ENCODING:
 262                 return mpeg_video_encoding;
 263         case V4L2_CID_MPEG_VIDEO_ASPECT:
 264                 return mpeg_video_aspect;
 265         case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
 266                 return mpeg_video_bitrate_mode;
 267         case V4L2_CID_MPEG_STREAM_TYPE:
 268                 return mpeg_stream_type;
 269         case V4L2_CID_MPEG_STREAM_VBI_FMT:
 270                 return mpeg_stream_vbi_fmt;
 271         case V4L2_CID_POWER_LINE_FREQUENCY:
 272                 return camera_power_line_frequency;
 273         case V4L2_CID_EXPOSURE_AUTO:
 274                 return camera_exposure_auto;
 275         case V4L2_CID_COLORFX:
 276                 return colorfx;
 277         case V4L2_CID_TUNE_PREEMPHASIS:
 278                 return tune_preemphasis;
 279         default:
 280                 return NULL;
 281         }
 282 }
 283 EXPORT_SYMBOL(v4l2_ctrl_get_menu);
 284
 285 /* Return the control name. */
 286 const char *v4l2_ctrl_get_name(u32 id)
 287 {
 288         switch (id) {
 289         /* USER controls */
 290         /* Keep the order of the 'case's the same as in videodev2.h! */
 291         case V4L2_CID_USER_CLASS:               return "User Controls";
 292         case V4L2_CID_BRIGHTNESS:               return "Brightness";
 293         case V4L2_CID_CONTRAST:                 return "Contrast";
 294         case V4L2_CID_SATURATION:               return "Saturation";
 295         case V4L2_CID_HUE:                      return "Hue";
 296         case V4L2_CID_AUDIO_VOLUME:             return "Volume";
 297         case V4L2_CID_AUDIO_BALANCE:            return "Balance";
 298         case V4L2_CID_AUDIO_BASS:               return "Bass";
 299         case V4L2_CID_AUDIO_TREBLE:             return "Treble";
 300         case V4L2_CID_AUDIO_MUTE:               return "Mute";
 301         case V4L2_CID_AUDIO_LOUDNESS:           return "Loudness";
 302         case V4L2_CID_BLACK_LEVEL:              return "Black Level";
 303         case V4L2_CID_AUTO_WHITE_BALANCE:       return "White Balance, Automatic";
 304         case V4L2_CID_DO_WHITE_BALANCE:         return "Do White Balance";
 305         case V4L2_CID_RED_BALANCE:              return "Red Balance";
 306         case V4L2_CID_BLUE_BALANCE:             return "Blue Balance";
 307         case V4L2_CID_GAMMA:                    return "Gamma";
 308         case V4L2_CID_EXPOSURE:                 return "Exposure";
 309         case V4L2_CID_AUTOGAIN:                 return "Gain, Automatic";
 310         case V4L2_CID_GAIN:                     return "Gain";
 311         case V4L2_CID_HFLIP:                    return "Horizontal Flip";
 312         case V4L2_CID_VFLIP:                    return "Vertical Flip";
 313         case V4L2_CID_HCENTER:                  return "Horizontal Center";
 314         case V4L2_CID_VCENTER:                  return "Vertical Center";
 315         case V4L2_CID_POWER_LINE_FREQUENCY:     return "Power Line Frequency";
 316         case V4L2_CID_HUE_AUTO:                 return "Hue, Automatic";
 317         case V4L2_CID_WHITE_BALANCE_TEMPERATURE: return "White Balance Temperature";
 318         case V4L2_CID_SHARPNESS:                return "Sharpness";
 319         case V4L2_CID_BACKLIGHT_COMPENSATION:   return "Backlight Compensation";
 320         case V4L2_CID_CHROMA_AGC:               return "Chroma AGC";
 321         case V4L2_CID_COLOR_KILLER:             return "Color Killer";
 322         case V4L2_CID_COLORFX:                  return "Color Effects";
 323         case V4L2_CID_AUTOBRIGHTNESS:           return "Brightness, Automatic";
 324         case V4L2_CID_BAND_STOP_FILTER:         return "Band-Stop Filter";
 325         case V4L2_CID_ROTATE:                   return "Rotate";
 326         case V4L2_CID_BG_COLOR:                 return "Background Color";
 327         case V4L2_CID_CHROMA_GAIN:              return "Chroma Gain";
 328         case V4L2_CID_ILLUMINATORS_1:           return "Illuminator 1";
 329         case V4L2_CID_ILLUMINATORS_2:           return "Illuminator 2";
 330
 331         /* MPEG controls */
 332         /* Keep the order of the 'case's the same as in videodev2.h! */
 333         case V4L2_CID_MPEG_CLASS:               return "MPEG Encoder Controls";
 334         case V4L2_CID_MPEG_STREAM_TYPE:         return "Stream Type";
 335         case V4L2_CID_MPEG_STREAM_PID_PMT:      return "Stream PMT Program ID";
 336         case V4L2_CID_MPEG_STREAM_PID_AUDIO:    return "Stream Audio Program ID";
 337         case V4L2_CID_MPEG_STREAM_PID_VIDEO:    return "Stream Video Program ID";
 338         case V4L2_CID_MPEG_STREAM_PID_PCR:      return "Stream PCR Program ID";
 339         case V4L2_CID_MPEG_STREAM_PES_ID_AUDIO: return "Stream PES Audio ID";
 340         case V4L2_CID_MPEG_STREAM_PES_ID_VIDEO: return "Stream PES Video ID";
 341         case V4L2_CID_MPEG_STREAM_VBI_FMT:      return "Stream VBI Format";
 342         case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ: return "Audio Sampling Frequency";
 343         case V4L2_CID_MPEG_AUDIO_ENCODING:      return "Audio Encoding";
 344         case V4L2_CID_MPEG_AUDIO_L1_BITRATE:    return "Audio Layer I Bitrate";
 345         case V4L2_CID_MPEG_AUDIO_L2_BITRATE:    return "Audio Layer II Bitrate";
 346         case V4L2_CID_MPEG_AUDIO_L3_BITRATE:    return "Audio Layer III Bitrate";
 347         case V4L2_CID_MPEG_AUDIO_MODE:          return "Audio Stereo Mode";
 348         case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION: return "Audio Stereo Mode Extension";
 349         case V4L2_CID_MPEG_AUDIO_EMPHASIS:      return "Audio Emphasis";
 350         case V4L2_CID_MPEG_AUDIO_CRC:           return "Audio CRC";
 351         case V4L2_CID_MPEG_AUDIO_MUTE:          return "Audio Mute";
 352         case V4L2_CID_MPEG_AUDIO_AAC_BITRATE:   return "Audio AAC Bitrate";
 353         case V4L2_CID_MPEG_AUDIO_AC3_BITRATE:   return "Audio AC-3 Bitrate";
 354         case V4L2_CID_MPEG_VIDEO_ENCODING:      return "Video Encoding";
 355         case V4L2_CID_MPEG_VIDEO_ASPECT:        return "Video Aspect";
 356         case V4L2_CID_MPEG_VIDEO_B_FRAMES:      return "Video B Frames";
 357         case V4L2_CID_MPEG_VIDEO_GOP_SIZE:      return "Video GOP Size";
 358         case V4L2_CID_MPEG_VIDEO_GOP_CLOSURE:   return "Video GOP Closure";
 359         case V4L2_CID_MPEG_VIDEO_PULLDOWN:      return "Video Pulldown";
 360         case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:  return "Video Bitrate Mode";
 361         case V4L2_CID_MPEG_VIDEO_BITRATE:       return "Video Bitrate";
 362         case V4L2_CID_MPEG_VIDEO_BITRATE_PEAK:  return "Video Peak Bitrate";
 363         case V4L2_CID_MPEG_VIDEO_TEMPORAL_DECIMATION: return "Video Temporal Decimation";
 364         case V4L2_CID_MPEG_VIDEO_MUTE:          return "Video Mute";
 365         case V4L2_CID_MPEG_VIDEO_MUTE_YUV:      return "Video Mute YUV";
 366
 367         /* CAMERA controls */
 368         /* Keep the order of the 'case's the same as in videodev2.h! */
 369         case V4L2_CID_CAMERA_CLASS:             return "Camera Controls";
 370         case V4L2_CID_EXPOSURE_AUTO:            return "Auto Exposure";
 371         case V4L2_CID_EXPOSURE_ABSOLUTE:        return "Exposure Time, Absolute";
 372         case V4L2_CID_EXPOSURE_AUTO_PRIORITY:   return "Exposure, Dynamic Framerate";
 373         case V4L2_CID_PAN_RELATIVE:             return "Pan, Relative";
 374         case V4L2_CID_TILT_RELATIVE:            return "Tilt, Relative";
 375         case V4L2_CID_PAN_RESET:                return "Pan, Reset";
 376         case V4L2_CID_TILT_RESET:               return "Tilt, Reset";
 377         case V4L2_CID_PAN_ABSOLUTE:             return "Pan, Absolute";
 378         case V4L2_CID_TILT_ABSOLUTE:            return "Tilt, Absolute";
 379         case V4L2_CID_FOCUS_ABSOLUTE:           return "Focus, Absolute";
 380         case V4L2_CID_FOCUS_RELATIVE:           return "Focus, Relative";
 381         case V4L2_CID_FOCUS_AUTO:               return "Focus, Automatic";
 382         case V4L2_CID_ZOOM_ABSOLUTE:            return "Zoom, Absolute";
 383         case V4L2_CID_ZOOM_RELATIVE:            return "Zoom, Relative";
 384         case V4L2_CID_ZOOM_CONTINUOUS:          return "Zoom, Continuous";
 385         case V4L2_CID_PRIVACY:                  return "Privacy";
 386         case V4L2_CID_IRIS_ABSOLUTE:            return "Iris, Absolute";
 387         case V4L2_CID_IRIS_RELATIVE:            return "Iris, Relative";
 388
 389         /* FM Radio Modulator control */
 390         /* Keep the order of the 'case's the same as in videodev2.h! */
 391         case V4L2_CID_FM_TX_CLASS:              return "FM Radio Modulator Controls";
 392         case V4L2_CID_RDS_TX_DEVIATION:         return "RDS Signal Deviation";
 393         case V4L2_CID_RDS_TX_PI:                return "RDS Program ID";
 394         case V4L2_CID_RDS_TX_PTY:               return "RDS Program Type";
 395         case V4L2_CID_RDS_TX_PS_NAME:           return "RDS PS Name";
 396         case V4L2_CID_RDS_TX_RADIO_TEXT:        return "RDS Radio Text";
 397         case V4L2_CID_AUDIO_LIMITER_ENABLED:    return "Audio Limiter Feature Enabled";
 398         case V4L2_CID_AUDIO_LIMITER_RELEASE_TIME: return "Audio Limiter Release Time";
 399         case V4L2_CID_AUDIO_LIMITER_DEVIATION:  return "Audio Limiter Deviation";
 400         case V4L2_CID_AUDIO_COMPRESSION_ENABLED: return "Audio Compression Feature Enabled";
 401         case V4L2_CID_AUDIO_COMPRESSION_GAIN:   return "Audio Compression Gain";
 402         case V4L2_CID_AUDIO_COMPRESSION_THRESHOLD: return "Audio Compression Threshold";
 403         case V4L2_CID_AUDIO_COMPRESSION_ATTACK_TIME: return "Audio Compression Attack Time";
 404         case V4L2_CID_AUDIO_COMPRESSION_RELEASE_TIME: return "Audio Compression Release Time";
 405         case V4L2_CID_PILOT_TONE_ENABLED:       return "Pilot Tone Feature Enabled";
 406         case V4L2_CID_PILOT_TONE_DEVIATION:     return "Pilot Tone Deviation";
 407         case V4L2_CID_PILOT_TONE_FREQUENCY:     return "Pilot Tone Frequency";
 408         case V4L2_CID_TUNE_PREEMPHASIS:         return "Pre-emphasis settings";
 409         case V4L2_CID_TUNE_POWER_LEVEL:         return "Tune Power Level";
 410         case V4L2_CID_TUNE_ANTENNA_CAPACITOR:   return "Tune Antenna Capacitor";
 411
 412         default:
 413                 return NULL;
 414         }
 415 }
 416 EXPORT_SYMBOL(v4l2_ctrl_get_name);
 417
 418 void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type,
 419                     s32 *min, s32 *max, s32 *step, s32 *def, u32 *flags)
 420 {
 421         *name = v4l2_ctrl_get_name(id);
 422         *flags = 0;
 423
 424         switch (id) {
 425         case V4L2_CID_AUDIO_MUTE:
 426         case V4L2_CID_AUDIO_LOUDNESS:
 427         case V4L2_CID_AUTO_WHITE_BALANCE:
 428         case V4L2_CID_AUTOGAIN:
 429         case V4L2_CID_HFLIP:
 430         case V4L2_CID_VFLIP:
 431         case V4L2_CID_HUE_AUTO:
 432         case V4L2_CID_CHROMA_AGC:
 433         case V4L2_CID_COLOR_KILLER:
 434         case V4L2_CID_MPEG_AUDIO_MUTE:
 435         case V4L2_CID_MPEG_VIDEO_MUTE:
 436         case V4L2_CID_MPEG_VIDEO_GOP_CLOSURE:
 437         case V4L2_CID_MPEG_VIDEO_PULLDOWN:
 438         case V4L2_CID_EXPOSURE_AUTO_PRIORITY:
 439         case V4L2_CID_FOCUS_AUTO:
 440         case V4L2_CID_PRIVACY:
 441         case V4L2_CID_AUDIO_LIMITER_ENABLED:
 442         case V4L2_CID_AUDIO_COMPRESSION_ENABLED:
 443         case V4L2_CID_PILOT_TONE_ENABLED:
 444         case V4L2_CID_ILLUMINATORS_1:
 445         case V4L2_CID_ILLUMINATORS_2:
 446                 *type = V4L2_CTRL_TYPE_BOOLEAN;
 447                 *min = 0;
 448                 *max = *step = 1;
 449                 break;
 450         case V4L2_CID_PAN_RESET:
 451         case V4L2_CID_TILT_RESET:
 452                 *type = V4L2_CTRL_TYPE_BUTTON;
 453                 *flags |= V4L2_CTRL_FLAG_WRITE_ONLY;
 454                 *min = *max = *step = *def = 0;
 455                 break;
 456         case V4L2_CID_POWER_LINE_FREQUENCY:
 457         case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ:
 458         case V4L2_CID_MPEG_AUDIO_ENCODING:
 459         case V4L2_CID_MPEG_AUDIO_L1_BITRATE:
 460         case V4L2_CID_MPEG_AUDIO_L2_BITRATE:
 461         case V4L2_CID_MPEG_AUDIO_L3_BITRATE:
 462         case V4L2_CID_MPEG_AUDIO_AC3_BITRATE:
 463         case V4L2_CID_MPEG_AUDIO_MODE:
 464         case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION:
 465         case V4L2_CID_MPEG_AUDIO_EMPHASIS:
 466         case V4L2_CID_MPEG_AUDIO_CRC:
 467         case V4L2_CID_MPEG_VIDEO_ENCODING:
 468         case V4L2_CID_MPEG_VIDEO_ASPECT:
 469         case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
 470         case V4L2_CID_MPEG_STREAM_TYPE:
 471         case V4L2_CID_MPEG_STREAM_VBI_FMT:
 472         case V4L2_CID_EXPOSURE_AUTO:
 473         case V4L2_CID_COLORFX:
 474         case V4L2_CID_TUNE_PREEMPHASIS:
 475                 *type = V4L2_CTRL_TYPE_MENU;
 476                 break;
 477         case V4L2_CID_RDS_TX_PS_NAME:
 478         case V4L2_CID_RDS_TX_RADIO_TEXT:
 479                 *type = V4L2_CTRL_TYPE_STRING;
 480                 break;
 481         case V4L2_CID_USER_CLASS:
 482         case V4L2_CID_CAMERA_CLASS:
 483         case V4L2_CID_MPEG_CLASS:
 484         case V4L2_CID_FM_TX_CLASS:
 485                 *type = V4L2_CTRL_TYPE_CTRL_CLASS;
 486                 /* You can neither read not write these */
 487                 *flags |= V4L2_CTRL_FLAG_READ_ONLY | V4L2_CTRL_FLAG_WRITE_ONLY;
 488                 *min = *max = *step = *def = 0;
 489                 break;
 490         case V4L2_CID_BG_COLOR:
 491                 *type = V4L2_CTRL_TYPE_INTEGER;
 492                 *step = 1;
 493                 *min = 0;
 494                 /* Max is calculated as RGB888 that is 2^24 */
 495                 *max = 0xFFFFFF;
 496                 break;
 497         default:
 498                 *type = V4L2_CTRL_TYPE_INTEGER;
 499                 break;
 500         }
 501         switch (id) {
 502         case V4L2_CID_MPEG_AUDIO_ENCODING:
 503         case V4L2_CID_MPEG_AUDIO_MODE:
 504         case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
 505         case V4L2_CID_MPEG_VIDEO_B_FRAMES:
 506         case V4L2_CID_MPEG_STREAM_TYPE:
 507                 *flags |= V4L2_CTRL_FLAG_UPDATE;
 508                 break;
 509         case V4L2_CID_AUDIO_VOLUME:
 510         case V4L2_CID_AUDIO_BALANCE:
 511         case V4L2_CID_AUDIO_BASS:
 512         case V4L2_CID_AUDIO_TREBLE:
 513         case V4L2_CID_BRIGHTNESS:
 514         case V4L2_CID_CONTRAST:
 515         case V4L2_CID_SATURATION:
 516         case V4L2_CID_HUE:
 517         case V4L2_CID_RED_BALANCE:
 518         case V4L2_CID_BLUE_BALANCE:
 519         case V4L2_CID_GAMMA:
 520         case V4L2_CID_SHARPNESS:
 521         case V4L2_CID_CHROMA_GAIN:
 522         case V4L2_CID_RDS_TX_DEVIATION:
 523         case V4L2_CID_AUDIO_LIMITER_RELEASE_TIME:
 524         case V4L2_CID_AUDIO_LIMITER_DEVIATION:
 525         case V4L2_CID_AUDIO_COMPRESSION_GAIN:
 526         case V4L2_CID_AUDIO_COMPRESSION_THRESHOLD:
 527         case V4L2_CID_AUDIO_COMPRESSION_ATTACK_TIME:
 528         case V4L2_CID_AUDIO_COMPRESSION_RELEASE_TIME:
 529         case V4L2_CID_PILOT_TONE_DEVIATION:
 530         case V4L2_CID_PILOT_TONE_FREQUENCY:
 531         case V4L2_CID_TUNE_POWER_LEVEL:
 532         case V4L2_CID_TUNE_ANTENNA_CAPACITOR:
 533                 *flags |= V4L2_CTRL_FLAG_SLIDER;
 534                 break;
 535         case V4L2_CID_PAN_RELATIVE:
 536         case V4L2_CID_TILT_RELATIVE:
 537         case V4L2_CID_FOCUS_RELATIVE:
 538         case V4L2_CID_IRIS_RELATIVE:
 539         case V4L2_CID_ZOOM_RELATIVE:
 540                 *flags |= V4L2_CTRL_FLAG_WRITE_ONLY;
 541                 break;
 542         }
 543 }
 544 EXPORT_SYMBOL(v4l2_ctrl_fill);
 545
 546 /* Helper function to determine whether the control type is compatible with
 547    VIDIOC_G/S_CTRL. */
 548 static bool type_is_int(const struct v4l2_ctrl *ctrl)
 549 {
 550         switch (ctrl->type) {
 551         case V4L2_CTRL_TYPE_INTEGER64:
 552         case V4L2_CTRL_TYPE_STRING:
 553                 /* Nope, these need v4l2_ext_control */
 554                 return false;
 555         default:
 556                 return true;
 557         }
 558 }
 559
 560 static void fill_event(struct v4l2_event *ev, struct v4l2_ctrl *ctrl, u32 changes)
 561 {
 562         memset(ev->reserved, 0, sizeof(ev->reserved));
 563         ev->type = V4L2_EVENT_CTRL;
 564         ev->id = ctrl->id;
 565         ev->u.ctrl.changes = changes;
 566         ev->u.ctrl.type = ctrl->type;
 567         ev->u.ctrl.flags = ctrl->flags;
 568         if (ctrl->type == V4L2_CTRL_TYPE_STRING)
 569                 ev->u.ctrl.value64 = 0;
 570         else
 571                 ev->u.ctrl.value64 = ctrl->cur.val64;
 572         ev->u.ctrl.minimum = ctrl->minimum;
 573         ev->u.ctrl.maximum = ctrl->maximum;
 574         if (ctrl->type == V4L2_CTRL_TYPE_MENU)
 575                 ev->u.ctrl.step = 1;
 576         else
 577                 ev->u.ctrl.step = ctrl->step;
 578         ev->u.ctrl.default_value = ctrl->default_value;
 579 }
 580
 581 static void send_event(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, u32 changes)
 582 {
 583         struct v4l2_event ev;
 584         struct v4l2_ctrl_fh *pos;
 585
 586         if (list_empty(&ctrl->fhs))
 587                         return;
 588         fill_event(&ev, ctrl, changes);
 589
 590         list_for_each_entry(pos, &ctrl->fhs, node)
 591                 if (pos->fh != fh)
 592                         v4l2_event_queue_fh(pos->fh, &ev);
 593 }
 594
 595 /* Helper function: copy the current control value back to the caller */
 596 static int cur_to_user(struct v4l2_ext_control *c,
 597                        struct v4l2_ctrl *ctrl)
 598 {
 599         u32 len;
 600
 601         switch (ctrl->type) {
 602         case V4L2_CTRL_TYPE_STRING:
 603                 len = strlen(ctrl->cur.string);
 604                 if (c->size < len + 1) {
 605                         c->size = len + 1;
 606                         return -ENOSPC;
 607                 }
 608                 return copy_to_user(c->string, ctrl->cur.string,
 609                                                 len + 1) ? -EFAULT : 0;
 610         case V4L2_CTRL_TYPE_INTEGER64:
 611                 c->value64 = ctrl->cur.val64;
 612                 break;
 613         default:
 614                 c->value = ctrl->cur.val;
 615                 break;
 616         }
 617         return 0;
 618 }
 619
 620 /* Helper function: copy the caller-provider value as the new control value */
 621 static int user_to_new(struct v4l2_ext_control *c,
 622                        struct v4l2_ctrl *ctrl)
 623 {
 624         int ret;
 625         u32 size;
 626
 627         ctrl->is_new = 1;
 628         switch (ctrl->type) {
 629         case V4L2_CTRL_TYPE_INTEGER64:
 630                 ctrl->val64 = c->value64;
 631                 break;
 632         case V4L2_CTRL_TYPE_STRING:
 633                 size = c->size;
 634                 if (size == 0)
 635                         return -ERANGE;
 636                 if (size > ctrl->maximum + 1)
 637                         size = ctrl->maximum + 1;
 638                 ret = copy_from_user(ctrl->string, c->string, size);
 639                 if (!ret) {
 640                         char last = ctrl->string[size - 1];
 641
 642                         ctrl->string[size - 1] = 0;
 643                         /* If the string was longer than ctrl->maximum,
 644                            then return an error. */
 645                         if (strlen(ctrl->string) == ctrl->maximum && last)
 646                                 return -ERANGE;
 647                 }
 648                 return ret ? -EFAULT : 0;
 649         default:
 650                 ctrl->val = c->value;
 651                 break;
 652         }
 653         return 0;
 654 }
 655
 656 /* Helper function: copy the new control value back to the caller */
 657 static int new_to_user(struct v4l2_ext_control *c,
 658                        struct v4l2_ctrl *ctrl)
 659 {
 660         u32 len;
 661
 662         switch (ctrl->type) {
 663         case V4L2_CTRL_TYPE_STRING:
 664                 len = strlen(ctrl->string);
 665                 if (c->size < len + 1) {
 666                         c->size = ctrl->maximum + 1;
 667                         return -ENOSPC;
 668                 }
 669                 return copy_to_user(c->string, ctrl->string,
 670                                                 len + 1) ? -EFAULT : 0;
 671         case V4L2_CTRL_TYPE_INTEGER64:
 672                 c->value64 = ctrl->val64;
 673                 break;
 674         default:
 675                 c->value = ctrl->val;
 676                 break;
 677         }
 678         return 0;
 679 }
 680
 681 static int ctrl_to_user(struct v4l2_ext_control *c,
 682                        struct v4l2_ctrl *ctrl)
 683 {
 684         if (ctrl->is_volatile)
 685                 return new_to_user(c, ctrl);
 686         return cur_to_user(c, ctrl);
 687 }
 688
 689 static int ctrl_is_volatile(struct v4l2_ext_control *c,
 690                        struct v4l2_ctrl *ctrl)
 691 {
 692         return ctrl->is_volatile;
 693 }
 694
 695 /* Copy the new value to the current value. */
 696 static void new_to_cur(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl,
 697                                                 bool update_inactive)
 698 {
 699         bool changed = false;
 700
 701         if (ctrl == NULL)
 702                 return;
 703         switch (ctrl->type) {
 704         case V4L2_CTRL_TYPE_BUTTON:
 705                 changed = true;
 706                 break;
 707         case V4L2_CTRL_TYPE_STRING:
 708                 /* strings are always 0-terminated */
 709                 changed = strcmp(ctrl->string, ctrl->cur.string);
 710                 strcpy(ctrl->cur.string, ctrl->string);
 711                 break;
 712         case V4L2_CTRL_TYPE_INTEGER64:
 713                 changed = ctrl->val64 != ctrl->cur.val64;
 714                 ctrl->cur.val64 = ctrl->val64;
 715                 break;
 716         default:
 717                 changed = ctrl->val != ctrl->cur.val;
 718                 ctrl->cur.val = ctrl->val;
 719                 break;
 720         }
 721         if (update_inactive) {
 722                 ctrl->flags &= ~V4L2_CTRL_FLAG_INACTIVE;
 723                 if (!is_cur_manual(ctrl->cluster[0]))
 724                         ctrl->flags |= V4L2_CTRL_FLAG_INACTIVE;
 725         }
 726         if (changed || update_inactive)
 727                 send_event(fh, ctrl,
 728                         (changed ? V4L2_EVENT_CTRL_CH_VALUE : 0) |
 729                         (update_inactive ? V4L2_EVENT_CTRL_CH_FLAGS : 0));
 730 }
 731
 732 /* Copy the current value to the new value */
 733 static void cur_to_new(struct v4l2_ctrl *ctrl)
 734 {
 735         if (ctrl == NULL)
 736                 return;
 737         switch (ctrl->type) {
 738         case V4L2_CTRL_TYPE_STRING:
 739                 /* strings are always 0-terminated */
 740                 strcpy(ctrl->string, ctrl->cur.string);
 741                 break;
 742         case V4L2_CTRL_TYPE_INTEGER64:
 743                 ctrl->val64 = ctrl->cur.val64;
 744                 break;
 745         default:
 746                 ctrl->val = ctrl->cur.val;
 747                 break;
 748         }
 749 }
 750
 751 /* Return non-zero if one or more of the controls in the cluster has a new
 752    value that differs from the current value. */
 753 static int cluster_changed(struct v4l2_ctrl *master)
 754 {
 755         int diff = 0;
 756         int i;
 757
 758         for (i = 0; !diff && i < master->ncontrols; i++) {
 759                 struct v4l2_ctrl *ctrl = master->cluster[i];
 760
 761                 if (ctrl == NULL)
 762                         continue;
 763                 switch (ctrl->type) {
 764                 case V4L2_CTRL_TYPE_BUTTON:
 765                         /* Button controls are always 'different' */
 766                         return 1;
 767                 case V4L2_CTRL_TYPE_STRING:
 768                         /* strings are always 0-terminated */
 769                         diff = strcmp(ctrl->string, ctrl->cur.string);
 770                         break;
 771                 case V4L2_CTRL_TYPE_INTEGER64:
 772                         diff = ctrl->val64 != ctrl->cur.val64;
 773                         break;
 774                 default:
 775                         diff = ctrl->val != ctrl->cur.val;
 776                         break;
 777                 }
 778         }
 779         return diff;
 780 }
 781
 782 /* Validate a new control */
 783 static int validate_new(struct v4l2_ctrl *ctrl)
 784 {
 785         s32 val = ctrl->val;
 786         char *s = ctrl->string;
 787         u32 offset;
 788         size_t len;
 789
 790         switch (ctrl->type) {
 791         case V4L2_CTRL_TYPE_INTEGER:
 792                 /* Round towards the closest legal value */
 793                 val += ctrl->step / 2;
 794                 if (val < ctrl->minimum)
 795                         val = ctrl->minimum;
 796                 if (val > ctrl->maximum)
 797                         val = ctrl->maximum;
 798                 offset = val - ctrl->minimum;
 799                 offset = ctrl->step * (offset / ctrl->step);
 800                 val = ctrl->minimum + offset;
 801                 ctrl->val = val;
 802                 return 0;
 803
 804         case V4L2_CTRL_TYPE_BOOLEAN:
 805                 ctrl->val = !!ctrl->val;
 806                 return 0;
 807
 808         case V4L2_CTRL_TYPE_MENU:
 809                 if (val < ctrl->minimum || val > ctrl->maximum)
 810                         return -ERANGE;
 811                 if (ctrl->qmenu[val][0] == '\0' ||
 812                     (ctrl->menu_skip_mask & (1 << val)))
 813                         return -EINVAL;
 814                 return 0;
 815
 816         case V4L2_CTRL_TYPE_BUTTON:
 817         case V4L2_CTRL_TYPE_CTRL_CLASS:
 818                 ctrl->val64 = 0;
 819                 return 0;
 820
 821         case V4L2_CTRL_TYPE_INTEGER64:
 822                 return 0;
 823
 824         case V4L2_CTRL_TYPE_STRING:
 825                 len = strlen(s);
 826                 if (len < ctrl->minimum)
 827                         return -ERANGE;
 828                 if ((len - ctrl->minimum) % ctrl->step)
 829                         return -ERANGE;
 830                 return 0;
 831
 832         default:
 833                 return -EINVAL;
 834         }
 835 }
 836
 837 static inline u32 node2id(struct list_head *node)
 838 {
 839         return list_entry(node, struct v4l2_ctrl_ref, node)->ctrl->id;
 840 }
 841
 842 /* Set the handler's error code if it wasn't set earlier already */
 843 static inline int handler_set_err(struct v4l2_ctrl_handler *hdl, int err)
 844 {
 845         if (hdl->error == 0)
 846                 hdl->error = err;
 847         return err;
 848 }
 849
 850 /* Initialize the handler */
 851 int v4l2_ctrl_handler_init(struct v4l2_ctrl_handler *hdl,
 852                            unsigned nr_of_controls_hint)
 853 {
 854         mutex_init(&hdl->lock);
 855         INIT_LIST_HEAD(&hdl->ctrls);
 856         INIT_LIST_HEAD(&hdl->ctrl_refs);
 857         hdl->nr_of_buckets = 1 + nr_of_controls_hint / 8;
 858         hdl->buckets = kzalloc(sizeof(hdl->buckets[0]) * hdl->nr_of_buckets,
 859                                                                 GFP_KERNEL);
 860         hdl->error = hdl->buckets ? 0 : -ENOMEM;
 861         return hdl->error;
 862 }
 863 EXPORT_SYMBOL(v4l2_ctrl_handler_init);
 864
 865 /* Free all controls and control refs */
 866 void v4l2_ctrl_handler_free(struct v4l2_ctrl_handler *hdl)
 867 {
 868         struct v4l2_ctrl_ref *ref, *next_ref;
 869         struct v4l2_ctrl *ctrl, *next_ctrl;
 870         struct v4l2_ctrl_fh *ctrl_fh, *next_ctrl_fh;
 871
 872         if (hdl == NULL || hdl->buckets == NULL)
 873                 return;
 874
 875         mutex_lock(&hdl->lock);
 876         /* Free all nodes */
 877         list_for_each_entry_safe(ref, next_ref, &hdl->ctrl_refs, node) {
 878                 list_del(&ref->node);
 879                 kfree(ref);
 880         }
 881         /* Free all controls owned by the handler */
 882         list_for_each_entry_safe(ctrl, next_ctrl, &hdl->ctrls, node) {
 883                 list_del(&ctrl->node);
 884                 list_for_each_entry_safe(ctrl_fh, next_ctrl_fh, &ctrl->fhs, node) {
 885                         list_del(&ctrl_fh->node);
 886                         kfree(ctrl_fh);
 887                 }
 888                 kfree(ctrl);
 889         }
 890         kfree(hdl->buckets);
 891         hdl->buckets = NULL;
 892         hdl->cached = NULL;
 893         hdl->error = 0;
 894         mutex_unlock(&hdl->lock);
 895 }
 896 EXPORT_SYMBOL(v4l2_ctrl_handler_free);
 897
 898 /* For backwards compatibility: V4L2_CID_PRIVATE_BASE should no longer
 899    be used except in G_CTRL, S_CTRL, QUERYCTRL and QUERYMENU when dealing
 900    with applications that do not use the NEXT_CTRL flag.
 901
 902    We just find the n-th private user control. It's O(N), but that should not
 903    be an issue in this particular case. */
 904 static struct v4l2_ctrl_ref *find_private_ref(
 905                 struct v4l2_ctrl_handler *hdl, u32 id)
 906 {
 907         struct v4l2_ctrl_ref *ref;
 908
 909         id -= V4L2_CID_PRIVATE_BASE;
 910         list_for_each_entry(ref, &hdl->ctrl_refs, node) {
 911                 /* Search for private user controls that are compatible with
 912                    VIDIOC_G/S_CTRL. */
 913                 if (V4L2_CTRL_ID2CLASS(ref->ctrl->id) == V4L2_CTRL_CLASS_USER &&
 914                     V4L2_CTRL_DRIVER_PRIV(ref->ctrl->id)) {
 915                         if (!type_is_int(ref->ctrl))
 916                                 continue;
 917                         if (id == 0)
 918                                 return ref;
 919                         id--;
 920                 }
 921         }
 922         return NULL;
 923 }
 924
 925 /* Find a control with the given ID. */
 926 static struct v4l2_ctrl_ref *find_ref(struct v4l2_ctrl_handler *hdl, u32 id)
 927 {
 928         struct v4l2_ctrl_ref *ref;
 929         int bucket;
 930
 931         id &= V4L2_CTRL_ID_MASK;
 932
 933         /* Old-style private controls need special handling */
 934         if (id >= V4L2_CID_PRIVATE_BASE)
 935                 return find_private_ref(hdl, id);
 936         bucket = id % hdl->nr_of_buckets;
 937
 938         /* Simple optimization: cache the last control found */
 939         if (hdl->cached && hdl->cached->ctrl->id == id)
 940                 return hdl->cached;
 941
 942         /* Not in cache, search the hash */
 943         ref = hdl->buckets ? hdl->buckets[bucket] : NULL;
 944         while (ref && ref->ctrl->id != id)
 945                 ref = ref->next;
 946
 947         if (ref)
 948                 hdl->cached = ref; /* cache it! */
 949         return ref;
 950 }
 951
 952 /* Find a control with the given ID. Take the handler's lock first. */
 953 static struct v4l2_ctrl_ref *find_ref_lock(
 954                 struct v4l2_ctrl_handler *hdl, u32 id)
 955 {
 956         struct v4l2_ctrl_ref *ref = NULL;
 957
 958         if (hdl) {
 959                 mutex_lock(&hdl->lock);
 960                 ref = find_ref(hdl, id);
 961                 mutex_unlock(&hdl->lock);
 962         }
 963         return ref;
 964 }
 965
 966 /* Find a control with the given ID. */
 967 struct v4l2_ctrl *v4l2_ctrl_find(struct v4l2_ctrl_handler *hdl, u32 id)
 968 {
 969         struct v4l2_ctrl_ref *ref = find_ref_lock(hdl, id);
 970
 971         return ref ? ref->ctrl : NULL;
 972 }
 973 EXPORT_SYMBOL(v4l2_ctrl_find);
 974
 975 /* Allocate a new v4l2_ctrl_ref and hook it into the handler. */
 976 static int handler_new_ref(struct v4l2_ctrl_handler *hdl,
 977                            struct v4l2_ctrl *ctrl)
 978 {
 979         struct v4l2_ctrl_ref *ref;
 980         struct v4l2_ctrl_ref *new_ref;
 981         u32 id = ctrl->id;
 982         u32 class_ctrl = V4L2_CTRL_ID2CLASS(id) | 1;
 983         int bucket = id % hdl->nr_of_buckets;   /* which bucket to use */
 984
 985         /* Automatically add the control class if it is not yet present. */
 986         if (id != class_ctrl && find_ref_lock(hdl, class_ctrl) == NULL)
 987                 if (!v4l2_ctrl_new_std(hdl, NULL, class_ctrl, 0, 0, 0, 0))
 988                         return hdl->error;
 989
 990         if (hdl->error)
 991                 return hdl->error;
 992
 993         new_ref = kzalloc(sizeof(*new_ref), GFP_KERNEL);
 994         if (!new_ref)
 995                 return handler_set_err(hdl, -ENOMEM);
 996         new_ref->ctrl = ctrl;
 997         if (ctrl->handler == hdl) {
 998                 /* By default each control starts in a cluster of its own.
 999                    new_ref->ctrl is basically a cluster array with one
1000                    element, so that's perfect to use as the cluster pointer.
1001                    But only do this for the handler that owns the control. */
1002                 ctrl->cluster = &new_ref->ctrl;
1003                 ctrl->ncontrols = 1;
1004         }
1005
1006         INIT_LIST_HEAD(&new_ref->node);
1007
1008         mutex_lock(&hdl->lock);
1009
1010         /* Add immediately at the end of the list if the list is empty, or if
1011            the last element in the list has a lower ID.
1012            This ensures that when elements are added in ascending order the
1013            insertion is an O(1) operation. */
1014         if (list_empty(&hdl->ctrl_refs) || id > node2id(hdl->ctrl_refs.prev)) {
1015                 list_add_tail(&new_ref->node, &hdl->ctrl_refs);
1016                 hdl->nr_of_refs++;
1017                 goto insert_in_hash;
1018         }
1019
1020         /* Find insert position in sorted list */
1021         list_for_each_entry(ref, &hdl->ctrl_refs, node) {
1022                 if (ref->ctrl->id < id)
1023                         continue;
1024                 /* Don't add duplicates */
1025                 if (ref->ctrl->id == id) {
1026                         kfree(new_ref);
1027                         goto unlock;
1028                 }
1029                 list_add(&new_ref->node, ref->node.prev);
1030                 break;
1031         }
1032
1033 insert_in_hash:
1034         /* Insert the control node in the hash */
1035         new_ref->next = hdl->buckets[bucket];
1036         hdl->buckets[bucket] = new_ref;
1037
1038 unlock:
1039         mutex_unlock(&hdl->lock);
1040         return 0;
1041 }
1042
1043 /* Add a new control */
1044 static struct v4l2_ctrl *v4l2_ctrl_new(struct v4l2_ctrl_handler *hdl,
1045                         const struct v4l2_ctrl_ops *ops,
1046                         u32 id, const char *name, enum v4l2_ctrl_type type,
1047                         s32 min, s32 max, u32 step, s32 def,
1048                         u32 flags, const char * const *qmenu, void *priv)
1049 {
1050         struct v4l2_ctrl *ctrl;
1051         unsigned sz_extra = 0;
1052
1053         if (hdl->error)
1054                 return NULL;
1055
1056         /* Sanity checks */
1057         if (id == 0 || name == NULL || id >= V4L2_CID_PRIVATE_BASE ||
1058             max < min ||
1059             (type == V4L2_CTRL_TYPE_INTEGER && step == 0) ||
1060             (type == V4L2_CTRL_TYPE_MENU && qmenu == NULL) ||
1061             (type == V4L2_CTRL_TYPE_STRING && max == 0)) {
1062                 handler_set_err(hdl, -ERANGE);
1063                 return NULL;
1064         }
1065         if ((type == V4L2_CTRL_TYPE_INTEGER ||
1066              type == V4L2_CTRL_TYPE_MENU ||
1067              type == V4L2_CTRL_TYPE_BOOLEAN) &&
1068             (def < min || def > max)) {
1069                 handler_set_err(hdl, -ERANGE);
1070                 return NULL;
1071         }
1072
1073         if (type == V4L2_CTRL_TYPE_BUTTON)
1074                 flags |= V4L2_CTRL_FLAG_WRITE_ONLY;
1075         else if (type == V4L2_CTRL_TYPE_CTRL_CLASS)
1076                 flags |= V4L2_CTRL_FLAG_READ_ONLY;
1077         else if (type == V4L2_CTRL_TYPE_STRING)
1078                 sz_extra += 2 * (max + 1);
1079
1080         ctrl = kzalloc(sizeof(*ctrl) + sz_extra, GFP_KERNEL);
1081         if (ctrl == NULL) {
1082                 handler_set_err(hdl, -ENOMEM);
1083                 return NULL;
1084         }
1085
1086         INIT_LIST_HEAD(&ctrl->node);
1087         INIT_LIST_HEAD(&ctrl->fhs);
1088         ctrl->handler = hdl;
1089         ctrl->ops = ops;
1090         ctrl->id = id;
1091         ctrl->name = name;
1092         ctrl->type = type;
1093         ctrl->flags = flags;
1094         ctrl->minimum = min;
1095         ctrl->maximum = max;
1096         ctrl->step = step;
1097         ctrl->qmenu = qmenu;
1098         ctrl->priv = priv;
1099         ctrl->cur.val = ctrl->val = ctrl->default_value = def;
1100
1101         if (ctrl->type == V4L2_CTRL_TYPE_STRING) {
1102                 ctrl->cur.string = (char *)&ctrl[1] + sz_extra - (max + 1);
1103                 ctrl->string = (char *)&ctrl[1] + sz_extra - 2 * (max + 1);
1104                 if (ctrl->minimum)
1105                         memset(ctrl->cur.string, ' ', ctrl->minimum);
1106         }
1107         if (handler_new_ref(hdl, ctrl)) {
1108                 kfree(ctrl);
1109                 return NULL;
1110         }
1111         mutex_lock(&hdl->lock);
1112         list_add_tail(&ctrl->node, &hdl->ctrls);
1113         mutex_unlock(&hdl->lock);
1114         return ctrl;
1115 }
1116
1117 struct v4l2_ctrl *v4l2_ctrl_new_custom(struct v4l2_ctrl_handler *hdl,
1118                         const struct v4l2_ctrl_config *cfg, void *priv)
1119 {
1120         bool is_menu;
1121         struct v4l2_ctrl *ctrl;
1122         const char *name = cfg->name;
1123         const char * const *qmenu = cfg->qmenu;
1124         enum v4l2_ctrl_type type = cfg->type;
1125         u32 flags = cfg->flags;
1126         s32 min = cfg->min;
1127         s32 max = cfg->max;
1128         u32 step = cfg->step;
1129         s32 def = cfg->def;
1130
1131         if (name == NULL)
1132                 v4l2_ctrl_fill(cfg->id, &name, &type, &min, &max, &step,
1133                                                                 &def, &flags);
1134
1135         is_menu = (cfg->type == V4L2_CTRL_TYPE_MENU);
1136         if (is_menu)
1137                 WARN_ON(step);
1138         else
1139                 WARN_ON(cfg->menu_skip_mask);
1140         if (is_menu && qmenu == NULL)
1141                 qmenu = v4l2_ctrl_get_menu(cfg->id);
1142
1143         ctrl = v4l2_ctrl_new(hdl, cfg->ops, cfg->id, name,
1144                         type, min, max,
1145                         is_menu ? cfg->menu_skip_mask : step,
1146                         def, flags, qmenu, priv);
1147         if (ctrl) {
1148                 ctrl->is_private = cfg->is_private;
1149                 ctrl->is_volatile = cfg->is_volatile;
1150         }
1151         return ctrl;
1152 }
1153 EXPORT_SYMBOL(v4l2_ctrl_new_custom);
1154
1155 /* Helper function for standard non-menu controls */
1156 struct v4l2_ctrl *v4l2_ctrl_new_std(struct v4l2_ctrl_handler *hdl,
1157                         const struct v4l2_ctrl_ops *ops,
1158                         u32 id, s32 min, s32 max, u32 step, s32 def)
1159 {
1160         const char *name;
1161         enum v4l2_ctrl_type type;
1162         u32 flags;
1163
1164         v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
1165         if (type == V4L2_CTRL_TYPE_MENU) {
1166                 handler_set_err(hdl, -EINVAL);
1167                 return NULL;
1168         }
1169         return v4l2_ctrl_new(hdl, ops, id, name, type,
1170                                     min, max, step, def, flags, NULL, NULL);
1171 }
1172 EXPORT_SYMBOL(v4l2_ctrl_new_std);
1173
1174 /* Helper function for standard menu controls */
1175 struct v4l2_ctrl *v4l2_ctrl_new_std_menu(struct v4l2_ctrl_handler *hdl,
1176                         const struct v4l2_ctrl_ops *ops,
1177                         u32 id, s32 max, s32 mask, s32 def)
1178 {
1179         const char * const *qmenu = v4l2_ctrl_get_menu(id);
1180         const char *name;
1181         enum v4l2_ctrl_type type;
1182         s32 min;
1183         s32 step;
1184         u32 flags;
1185
1186         v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
1187         if (type != V4L2_CTRL_TYPE_MENU) {
1188                 handler_set_err(hdl, -EINVAL);
1189                 return NULL;
1190         }
1191         return v4l2_ctrl_new(hdl, ops, id, name, type,
1192                                     0, max, mask, def, flags, qmenu, NULL);
1193 }
1194 EXPORT_SYMBOL(v4l2_ctrl_new_std_menu);
1195
1196 /* Add a control from another handler to this handler */
1197 struct v4l2_ctrl *v4l2_ctrl_add_ctrl(struct v4l2_ctrl_handler *hdl,
1198                                           struct v4l2_ctrl *ctrl)
1199 {
1200         if (hdl == NULL || hdl->error)
1201                 return NULL;
1202         if (ctrl == NULL) {
1203                 handler_set_err(hdl, -EINVAL);
1204                 return NULL;
1205         }
1206         if (ctrl->handler == hdl)
1207                 return ctrl;
1208         return handler_new_ref(hdl, ctrl) ? NULL : ctrl;
1209 }
1210 EXPORT_SYMBOL(v4l2_ctrl_add_ctrl);
1211
1212 /* Add the controls from another handler to our own. */
1213 int v4l2_ctrl_add_handler(struct v4l2_ctrl_handler *hdl,
1214                           struct v4l2_ctrl_handler *add)
1215 {
1216         struct v4l2_ctrl *ctrl;
1217         int ret = 0;
1218
1219         /* Do nothing if either handler is NULL or if they are the same */
1220         if (!hdl || !add || hdl == add)
1221                 return 0;
1222         if (hdl->error)
1223                 return hdl->error;
1224         mutex_lock(&add->lock);
1225         list_for_each_entry(ctrl, &add->ctrls, node) {
1226                 /* Skip handler-private controls. */
1227                 if (ctrl->is_private)
1228                         continue;
1229                 /* And control classes */
1230                 if (ctrl->type == V4L2_CTRL_TYPE_CTRL_CLASS)
1231                         continue;
1232                 ret = handler_new_ref(hdl, ctrl);
1233                 if (ret)
1234                         break;
1235         }
1236         mutex_unlock(&add->lock);
1237         return ret;
1238 }
1239 EXPORT_SYMBOL(v4l2_ctrl_add_handler);
1240
1241 /* Cluster controls */
1242 void v4l2_ctrl_cluster(unsigned ncontrols, struct v4l2_ctrl **controls)
1243 {
1244         int i;
1245
1246         /* The first control is the master control and it must not be NULL */
1247         BUG_ON(ncontrols == 0 || controls[0] == NULL);
1248
1249         for (i = 0; i < ncontrols; i++) {
1250                 if (controls[i]) {
1251                         controls[i]->cluster = controls;
1252                         controls[i]->ncontrols = ncontrols;
1253                 }
1254         }
1255 }
1256 EXPORT_SYMBOL(v4l2_ctrl_cluster);
1257
1258 void v4l2_ctrl_auto_cluster(unsigned ncontrols, struct v4l2_ctrl **controls,
1259                             u8 manual_val, bool set_volatile)
1260 {
1261         struct v4l2_ctrl *master = controls[0];
1262         u32 flag;
1263         int i;
1264
1265         v4l2_ctrl_cluster(ncontrols, controls);
1266         WARN_ON(ncontrols <= 1);
1267         master->is_auto = true;
1268         master->manual_mode_value = manual_val;
1269         master->flags |= V4L2_CTRL_FLAG_UPDATE;
1270         flag = is_cur_manual(master) ? 0 : V4L2_CTRL_FLAG_INACTIVE;
1271
1272         for (i = 1; i < ncontrols; i++)
1273                 if (controls[i]) {
1274                         controls[i]->is_volatile = set_volatile;
1275                         controls[i]->flags |= flag;
1276                 }
1277 }
1278 EXPORT_SYMBOL(v4l2_ctrl_auto_cluster);
1279
1280 /* Activate/deactivate a control. */
1281 void v4l2_ctrl_activate(struct v4l2_ctrl *ctrl, bool active)
1282 {
1283         /* invert since the actual flag is called 'inactive' */
1284         bool inactive = !active;
1285         bool old;
1286
1287         if (ctrl == NULL)
1288                 return;
1289
1290         if (inactive)
1291                 /* set V4L2_CTRL_FLAG_INACTIVE */
1292                 old = test_and_set_bit(4, &ctrl->flags);
1293         else
1294                 /* clear V4L2_CTRL_FLAG_INACTIVE */
1295                 old = test_and_clear_bit(4, &ctrl->flags);
1296         if (old != inactive)
1297                 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_FLAGS);
1298 }
1299 EXPORT_SYMBOL(v4l2_ctrl_activate);
1300
1301 /* Grab/ungrab a control.
1302    Typically used when streaming starts and you want to grab controls,
1303    preventing the user from changing them.
1304
1305    Just call this and the framework will block any attempts to change
1306    these controls. */
1307 void v4l2_ctrl_grab(struct v4l2_ctrl *ctrl, bool grabbed)
1308 {
1309         bool old;
1310
1311         if (ctrl == NULL)
1312                 return;
1313
1314         v4l2_ctrl_lock(ctrl);
1315         if (grabbed)
1316                 /* set V4L2_CTRL_FLAG_GRABBED */
1317                 old = test_and_set_bit(1, &ctrl->flags);
1318         else
1319                 /* clear V4L2_CTRL_FLAG_GRABBED */
1320                 old = test_and_clear_bit(1, &ctrl->flags);
1321         if (old != grabbed)
1322                 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_FLAGS);
1323         v4l2_ctrl_unlock(ctrl);
1324 }
1325 EXPORT_SYMBOL(v4l2_ctrl_grab);
1326
1327 /* Log the control name and value */
1328 static void log_ctrl(const struct v4l2_ctrl *ctrl,
1329                      const char *prefix, const char *colon)
1330 {
1331         int fl_inact = ctrl->flags & V4L2_CTRL_FLAG_INACTIVE;
1332         int fl_grabbed = ctrl->flags & V4L2_CTRL_FLAG_GRABBED;
1333
1334         if (ctrl->flags & (V4L2_CTRL_FLAG_DISABLED | V4L2_CTRL_FLAG_WRITE_ONLY))
1335                 return;
1336         if (ctrl->type == V4L2_CTRL_TYPE_CTRL_CLASS)
1337                 return;
1338
1339         printk(KERN_INFO "%s%s%s: ", prefix, colon, ctrl->name);
1340
1341         switch (ctrl->type) {
1342         case V4L2_CTRL_TYPE_INTEGER:
1343                 printk(KERN_CONT "%d", ctrl->cur.val);
1344                 break;
1345         case V4L2_CTRL_TYPE_BOOLEAN:
1346                 printk(KERN_CONT "%s", ctrl->cur.val ? "true" : "false");
1347                 break;
1348         case V4L2_CTRL_TYPE_MENU:
1349                 printk(KERN_CONT "%s", ctrl->qmenu[ctrl->cur.val]);
1350                 break;
1351         case V4L2_CTRL_TYPE_INTEGER64:
1352                 printk(KERN_CONT "%lld", ctrl->cur.val64);
1353                 break;
1354         case V4L2_CTRL_TYPE_STRING:
1355                 printk(KERN_CONT "%s", ctrl->cur.string);
1356                 break;
1357         default:
1358                 printk(KERN_CONT "unknown type %d", ctrl->type);
1359                 break;
1360         }
1361         if (fl_inact && fl_grabbed)
1362                 printk(KERN_CONT " (inactive, grabbed)\n");
1363         else if (fl_inact)
1364                 printk(KERN_CONT " (inactive)\n");
1365         else if (fl_grabbed)
1366                 printk(KERN_CONT " (grabbed)\n");
1367         else
1368                 printk(KERN_CONT "\n");
1369 }
1370
1371 /* Log all controls owned by the handler */
1372 void v4l2_ctrl_handler_log_status(struct v4l2_ctrl_handler *hdl,
1373                                   const char *prefix)
1374 {
1375         struct v4l2_ctrl *ctrl;
1376         const char *colon = "";
1377         int len;
1378
1379         if (hdl == NULL)
1380                 return;
1381         if (prefix == NULL)
1382                 prefix = "";
1383         len = strlen(prefix);
1384         if (len && prefix[len - 1] != ' ')
1385                 colon = ": ";
1386         mutex_lock(&hdl->lock);
1387         list_for_each_entry(ctrl, &hdl->ctrls, node)
1388                 if (!(ctrl->flags & V4L2_CTRL_FLAG_DISABLED))
1389                         log_ctrl(ctrl, prefix, colon);
1390         mutex_unlock(&hdl->lock);
1391 }
1392 EXPORT_SYMBOL(v4l2_ctrl_handler_log_status);
1393
1394 /* Call s_ctrl for all controls owned by the handler */
1395 int v4l2_ctrl_handler_setup(struct v4l2_ctrl_handler *hdl)
1396 {
1397         struct v4l2_ctrl *ctrl;
1398         int ret = 0;
1399
1400         if (hdl == NULL)
1401                 return 0;
1402         mutex_lock(&hdl->lock);
1403         list_for_each_entry(ctrl, &hdl->ctrls, node)
1404                 ctrl->done = false;
1405
1406         list_for_each_entry(ctrl, &hdl->ctrls, node) {
1407                 struct v4l2_ctrl *master = ctrl->cluster[0];
1408                 int i;
1409
1410                 /* Skip if this control was already handled by a cluster. */
1411                 if (ctrl->done)
1412                         continue;
1413
1414                 for (i = 0; i < master->ncontrols; i++) {
1415                         if (master->cluster[i]) {
1416                                 cur_to_new(master->cluster[i]);
1417                                 master->cluster[i]->is_new = 1;
1418                         }
1419                 }
1420
1421                 /* Skip button controls and read-only controls. */
1422                 if (ctrl->type == V4L2_CTRL_TYPE_BUTTON ||
1423                     (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY))
1424                         continue;
1425                 ret = call_op(master, s_ctrl);
1426                 if (ret)
1427                         break;
1428                 for (i = 0; i < master->ncontrols; i++)
1429                         if (master->cluster[i])
1430                                 master->cluster[i]->done = true;
1431         }
1432         mutex_unlock(&hdl->lock);
1433         return ret;
1434 }
1435 EXPORT_SYMBOL(v4l2_ctrl_handler_setup);
1436
1437 /* Implement VIDIOC_QUERYCTRL */
1438 int v4l2_queryctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_queryctrl *qc)
1439 {
1440         u32 id = qc->id & V4L2_CTRL_ID_MASK;
1441         struct v4l2_ctrl_ref *ref;
1442         struct v4l2_ctrl *ctrl;
1443
1444         if (hdl == NULL)
1445                 return -EINVAL;
1446
1447         mutex_lock(&hdl->lock);
1448
1449         /* Try to find it */
1450         ref = find_ref(hdl, id);
1451
1452         if ((qc->id & V4L2_CTRL_FLAG_NEXT_CTRL) && !list_empty(&hdl->ctrl_refs)) {
1453                 /* Find the next control with ID > qc->id */
1454
1455                 /* Did we reach the end of the control list? */
1456                 if (id >= node2id(hdl->ctrl_refs.prev)) {
1457                         ref = NULL; /* Yes, so there is no next control */
1458                 } else if (ref) {
1459                         /* We found a control with the given ID, so just get
1460                            the next one in the list. */
1461                         ref = list_entry(ref->node.next, typeof(*ref), node);
1462                 } else {
1463                         /* No control with the given ID exists, so start
1464                            searching for the next largest ID. We know there
1465                            is one, otherwise the first 'if' above would have
1466                            been true. */
1467                         list_for_each_entry(ref, &hdl->ctrl_refs, node)
1468                                 if (id < ref->ctrl->id)
1469                                         break;
1470                 }
1471         }
1472         mutex_unlock(&hdl->lock);
1473         if (!ref)
1474                 return -EINVAL;
1475
1476         ctrl = ref->ctrl;
1477         memset(qc, 0, sizeof(*qc));
1478         if (id >= V4L2_CID_PRIVATE_BASE)
1479                 qc->id = id;
1480         else
1481                 qc->id = ctrl->id;
1482         strlcpy(qc->name, ctrl->name, sizeof(qc->name));
1483         qc->minimum = ctrl->minimum;
1484         qc->maximum = ctrl->maximum;
1485         qc->default_value = ctrl->default_value;
1486         if (ctrl->type == V4L2_CTRL_TYPE_MENU)
1487                 qc->step = 1;
1488         else
1489                 qc->step = ctrl->step;
1490         qc->flags = ctrl->flags;
1491         qc->type = ctrl->type;
1492         return 0;
1493 }
1494 EXPORT_SYMBOL(v4l2_queryctrl);
1495
1496 int v4l2_subdev_queryctrl(struct v4l2_subdev *sd, struct v4l2_queryctrl *qc)
1497 {
1498         if (qc->id & V4L2_CTRL_FLAG_NEXT_CTRL)
1499                 return -EINVAL;
1500         return v4l2_queryctrl(sd->ctrl_handler, qc);
1501 }
1502 EXPORT_SYMBOL(v4l2_subdev_queryctrl);
1503
1504 /* Implement VIDIOC_QUERYMENU */
1505 int v4l2_querymenu(struct v4l2_ctrl_handler *hdl, struct v4l2_querymenu *qm)
1506 {
1507         struct v4l2_ctrl *ctrl;
1508         u32 i = qm->index;
1509
1510         ctrl = v4l2_ctrl_find(hdl, qm->id);
1511         if (!ctrl)
1512                 return -EINVAL;
1513
1514         qm->reserved = 0;
1515         /* Sanity checks */
1516         if (ctrl->qmenu == NULL ||
1517             i < ctrl->minimum || i > ctrl->maximum)
1518                 return -EINVAL;
1519         /* Use mask to see if this menu item should be skipped */
1520         if (ctrl->menu_skip_mask & (1 << i))
1521                 return -EINVAL;
1522         /* Empty menu items should also be skipped */
1523         if (ctrl->qmenu[i] == NULL || ctrl->qmenu[i][0] == '\0')
1524                 return -EINVAL;
1525         strlcpy(qm->name, ctrl->qmenu[i], sizeof(qm->name));
1526         return 0;
1527 }
1528 EXPORT_SYMBOL(v4l2_querymenu);
1529
1530 int v4l2_subdev_querymenu(struct v4l2_subdev *sd, struct v4l2_querymenu *qm)
1531 {
1532         return v4l2_querymenu(sd->ctrl_handler, qm);
1533 }
1534 EXPORT_SYMBOL(v4l2_subdev_querymenu);
1535
1536
1537
1538 /* Some general notes on the atomic requirements of VIDIOC_G/TRY/S_EXT_CTRLS:
1539
1540    It is not a fully atomic operation, just best-effort only. After all, if
1541    multiple controls have to be set through multiple i2c writes (for example)
1542    then some initial writes may succeed while others fail. Thus leaving the
1543    system in an inconsistent state. The question is how much effort you are
1544    willing to spend on trying to make something atomic that really isn't.
1545
1546    From the point of view of an application the main requirement is that
1547    when you call VIDIOC_S_EXT_CTRLS and some values are invalid then an
1548    error should be returned without actually affecting any controls.
1549
1550    If all the values are correct, then it is acceptable to just give up
1551    in case of low-level errors.
1552
1553    It is important though that the application can tell when only a partial
1554    configuration was done. The way we do that is through the error_idx field
1555    of struct v4l2_ext_controls: if that is equal to the count field then no
1556    controls were affected. Otherwise all controls before that index were
1557    successful in performing their 'get' or 'set' operation, the control at
1558    the given index failed, and you don't know what happened with the controls
1559    after the failed one. Since if they were part of a control cluster they
1560    could have been successfully processed (if a cluster member was encountered
1561    at index < error_idx), they could have failed (if a cluster member was at
1562    error_idx), or they may not have been processed yet (if the first cluster
1563    member appeared after error_idx).
1564
1565    It is all fairly theoretical, though. In practice all you can do is to
1566    bail out. If error_idx == count, then it is an application bug. If
1567    error_idx < count then it is only an application bug if the error code was
1568    EBUSY. That usually means that something started streaming just when you
1569    tried to set the controls. In all other cases it is a driver/hardware
1570    problem and all you can do is to retry or bail out.
1571
1572    Note that these rules do not apply to VIDIOC_TRY_EXT_CTRLS: since that
1573    never modifies controls the error_idx is just set to whatever control
1574    has an invalid value.
1575  */
1576
1577 /* Prepare for the extended g/s/try functions.
1578    Find the controls in the control array and do some basic checks. */
1579 static int prepare_ext_ctrls(struct v4l2_ctrl_handler *hdl,
1580                              struct v4l2_ext_controls *cs,
1581                              struct ctrl_helper *helpers)
1582 {
1583         u32 i;
1584
1585         for (i = 0; i < cs->count; i++) {
1586                 struct v4l2_ext_control *c = &cs->controls[i];
1587                 struct v4l2_ctrl *ctrl;
1588                 u32 id = c->id & V4L2_CTRL_ID_MASK;
1589
1590                 cs->error_idx = i;
1591
1592                 if (cs->ctrl_class && V4L2_CTRL_ID2CLASS(id) != cs->ctrl_class)
1593                         return -EINVAL;
1594
1595                 /* Old-style private controls are not allowed for
1596                    extended controls */
1597                 if (id >= V4L2_CID_PRIVATE_BASE)
1598                         return -EINVAL;
1599                 ctrl = v4l2_ctrl_find(hdl, id);
1600                 if (ctrl == NULL)
1601                         return -EINVAL;
1602                 if (ctrl->flags & V4L2_CTRL_FLAG_DISABLED)
1603                         return -EINVAL;
1604
1605                 helpers[i].ctrl = ctrl;
1606                 helpers[i].handled = false;
1607         }
1608         return 0;
1609 }
1610
1611 typedef int (*cluster_func)(struct v4l2_ext_control *c,
1612                             struct v4l2_ctrl *ctrl);
1613
1614 /* Walk over all controls in v4l2_ext_controls belonging to the same cluster
1615    and call the provided function. */
1616 static int cluster_walk(unsigned from,
1617                         struct v4l2_ext_controls *cs,
1618                         struct ctrl_helper *helpers,
1619                         cluster_func f)
1620 {
1621         struct v4l2_ctrl **cluster = helpers[from].ctrl->cluster;
1622         int ret = 0;
1623         int i;
1624
1625         /* Find any controls from the same cluster and call the function */
1626         for (i = from; !ret && i < cs->count; i++) {
1627                 struct v4l2_ctrl *ctrl = helpers[i].ctrl;
1628
1629                 if (!helpers[i].handled && ctrl->cluster == cluster)
1630                         ret = f(&cs->controls[i], ctrl);
1631         }
1632         return ret;
1633 }
1634
1635 static void cluster_done(unsigned from,
1636                          struct v4l2_ext_controls *cs,
1637                          struct ctrl_helper *helpers)
1638 {
1639         struct v4l2_ctrl **cluster = helpers[from].ctrl->cluster;
1640         int i;
1641
1642         /* Find any controls from the same cluster and mark them as handled */
1643         for (i = from; i < cs->count; i++)
1644                 if (helpers[i].ctrl->cluster == cluster)
1645                         helpers[i].handled = true;
1646 }
1647
1648 /* Handles the corner case where cs->count == 0. It checks whether the
1649    specified control class exists. If that class ID is 0, then it checks
1650    whether there are any controls at all. */
1651 static int class_check(struct v4l2_ctrl_handler *hdl, u32 ctrl_class)
1652 {
1653         if (ctrl_class == 0)
1654                 return list_empty(&hdl->ctrl_refs) ? -EINVAL : 0;
1655         return find_ref_lock(hdl, ctrl_class | 1) ? 0 : -EINVAL;
1656 }
1657
1658
1659
1660 /* Get extended controls. Allocates the helpers array if needed. */
1661 int v4l2_g_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *cs)
1662 {
1663         struct ctrl_helper helper[4];
1664         struct ctrl_helper *helpers = helper;
1665         int ret;
1666         int i, j;
1667
1668         cs->error_idx = cs->count;
1669         cs->ctrl_class = V4L2_CTRL_ID2CLASS(cs->ctrl_class);
1670
1671         if (hdl == NULL)
1672                 return -EINVAL;
1673
1674         if (cs->count == 0)
1675                 return class_check(hdl, cs->ctrl_class);
1676
1677         if (cs->count > ARRAY_SIZE(helper)) {
1678                 helpers = kmalloc(sizeof(helper[0]) * cs->count, GFP_KERNEL);
1679                 if (helpers == NULL)
1680                         return -ENOMEM;
1681         }
1682
1683         ret = prepare_ext_ctrls(hdl, cs, helpers);
1684         cs->error_idx = cs->count;
1685
1686         for (i = 0; !ret && i < cs->count; i++)
1687                 if (helpers[i].ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY)
1688                         ret = -EACCES;
1689
1690         for (i = 0; !ret && i < cs->count; i++) {
1691                 struct v4l2_ctrl *ctrl = helpers[i].ctrl;
1692                 struct v4l2_ctrl *master = ctrl->cluster[0];
1693                 bool has_volatiles;
1694
1695                 if (helpers[i].handled)
1696                         continue;
1697
1698                 cs->error_idx = i;
1699
1700                 /* Any volatile controls requested from this cluster? */
1701                 has_volatiles = ctrl->is_volatile;
1702                 if (!has_volatiles && has_op(master, g_volatile_ctrl) &&
1703                                 master->ncontrols > 1)
1704                         has_volatiles = cluster_walk(i, cs, helpers,
1705                                                 ctrl_is_volatile);
1706
1707                 v4l2_ctrl_lock(master);
1708
1709                 /* g_volatile_ctrl will update the new control values */
1710                 if (has_volatiles && !is_cur_manual(master)) {
1711                         for (j = 0; j < master->ncontrols; j++)
1712                                 cur_to_new(master->cluster[j]);
1713                         ret = call_op(master, g_volatile_ctrl);
1714                 }
1715                 /* If OK, then copy the current (for non-volatile controls)
1716                    or the new (for volatile controls) control values to the
1717                    caller */
1718                 if (!ret)
1719                         ret = cluster_walk(i, cs, helpers, ctrl_to_user);
1720                 v4l2_ctrl_unlock(master);
1721                 cluster_done(i, cs, helpers);
1722         }
1723
1724         if (cs->count > ARRAY_SIZE(helper))
1725                 kfree(helpers);
1726         return ret;
1727 }
1728 EXPORT_SYMBOL(v4l2_g_ext_ctrls);
1729
1730 int v4l2_subdev_g_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs)
1731 {
1732         return v4l2_g_ext_ctrls(sd->ctrl_handler, cs);
1733 }
1734 EXPORT_SYMBOL(v4l2_subdev_g_ext_ctrls);
1735
1736 /* Helper function to get a single control */
1737 static int get_ctrl(struct v4l2_ctrl *ctrl, s32 *val)
1738 {
1739         struct v4l2_ctrl *master = ctrl->cluster[0];
1740         int ret = 0;
1741         int i;
1742
1743         if (ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY)
1744                 return -EACCES;
1745
1746         v4l2_ctrl_lock(master);
1747         /* g_volatile_ctrl will update the current control values */
1748         if (ctrl->is_volatile && !is_cur_manual(master)) {
1749                 for (i = 0; i < master->ncontrols; i++)
1750                         cur_to_new(master->cluster[i]);
1751                 ret = call_op(master, g_volatile_ctrl);
1752                 *val = ctrl->val;
1753         } else {
1754                 *val = ctrl->cur.val;
1755         }
1756         v4l2_ctrl_unlock(master);
1757         return ret;
1758 }
1759
1760 int v4l2_g_ctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_control *control)
1761 {
1762         struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, control->id);
1763
1764         if (ctrl == NULL || !type_is_int(ctrl))
1765                 return -EINVAL;
1766         return get_ctrl(ctrl, &control->value);
1767 }
1768 EXPORT_SYMBOL(v4l2_g_ctrl);
1769
1770 int v4l2_subdev_g_ctrl(struct v4l2_subdev *sd, struct v4l2_control *control)
1771 {
1772         return v4l2_g_ctrl(sd->ctrl_handler, control);
1773 }
1774 EXPORT_SYMBOL(v4l2_subdev_g_ctrl);
1775
1776 s32 v4l2_ctrl_g_ctrl(struct v4l2_ctrl *ctrl)
1777 {
1778         s32 val = 0;
1779
1780         /* It's a driver bug if this happens. */
1781         WARN_ON(!type_is_int(ctrl));
1782         get_ctrl(ctrl, &val);
1783         return val;
1784 }
1785 EXPORT_SYMBOL(v4l2_ctrl_g_ctrl);
1786
1787
1788 /* Core function that calls try/s_ctrl and ensures that the new value is
1789    copied to the current value on a set.
1790    Must be called with ctrl->handler->lock held. */
1791 static int try_or_set_control_cluster(struct v4l2_fh *fh,
1792                                         struct v4l2_ctrl *master, bool set)
1793 {
1794         bool update_flag;
1795         bool try = !set;
1796         int ret = 0;
1797         int i;
1798
1799         /* Go through the cluster and either validate the new value or
1800            (if no new value was set), copy the current value to the new
1801            value, ensuring a consistent view for the control ops when
1802            called. */
1803         for (i = 0; !ret && i < master->ncontrols; i++) {
1804                 struct v4l2_ctrl *ctrl = master->cluster[i];
1805
1806                 if (ctrl == NULL)
1807                         continue;
1808
1809                 if (ctrl->is_new) {
1810                         /* Double check this: it may have changed since the
1811                            last check in try_or_set_ext_ctrls(). */
1812                         if (set && (ctrl->flags & V4L2_CTRL_FLAG_GRABBED))
1813                                 return -EBUSY;
1814
1815                         /* Validate if required */
1816                         if (!set)
1817                                 ret = validate_new(ctrl);
1818                         continue;
1819                 }
1820                 /* No new value was set, so copy the current and force
1821                    a call to try_ctrl later, since the values for the cluster
1822                    may now have changed and the end result might be invalid. */
1823                 try = true;
1824                 cur_to_new(ctrl);
1825         }
1826
1827         /* For larger clusters you have to call try_ctrl again to
1828            verify that the controls are still valid after the
1829            'cur_to_new' above. */
1830         if (!ret && try)
1831                 ret = call_op(master, try_ctrl);
1832
1833         /* Don't set if there is no change */
1834         if (ret || !set || !cluster_changed(master))
1835                 return ret;
1836         ret = call_op(master, s_ctrl);
1837         /* If OK, then make the new values permanent. */
1838         if (ret)
1839                 return ret;
1840
1841         update_flag = is_cur_manual(master) != is_new_manual(master);
1842         for (i = 0; i < master->ncontrols; i++)
1843                 new_to_cur(fh, master->cluster[i], update_flag && i > 0);
1844         return 0;
1845 }
1846
1847 /* Try or set controls. */
1848 static int try_or_set_ext_ctrls(struct v4l2_fh *fh,
1849                                 struct v4l2_ctrl_handler *hdl,
1850                                 struct v4l2_ext_controls *cs,
1851                                 struct ctrl_helper *helpers,
1852                                 bool set)
1853 {
1854         unsigned i, j;
1855         int ret = 0;
1856
1857         for (i = 0; i < cs->count; i++) {
1858                 struct v4l2_ctrl *ctrl = helpers[i].ctrl;
1859
1860                 cs->error_idx = i;
1861
1862                 if (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY)
1863                         return -EACCES;
1864                 /* This test is also done in try_set_control_cluster() which
1865                    is called in atomic context, so that has the final say,
1866                    but it makes sense to do an up-front check as well. Once
1867                    an error occurs in try_set_control_cluster() some other
1868                    controls may have been set already and we want to do a
1869                    best-effort to avoid that. */
1870                 if (set && (ctrl->flags & V4L2_CTRL_FLAG_GRABBED))
1871                         return -EBUSY;
1872         }
1873
1874         for (i = 0; !ret && i < cs->count; i++) {
1875                 struct v4l2_ctrl *ctrl = helpers[i].ctrl;
1876                 struct v4l2_ctrl *master = ctrl->cluster[0];
1877
1878                 if (helpers[i].handled)
1879                         continue;
1880
1881                 cs->error_idx = i;
1882                 v4l2_ctrl_lock(ctrl);
1883
1884                 /* Reset the 'is_new' flags of the cluster */
1885                 for (j = 0; j < master->ncontrols; j++)
1886                         if (master->cluster[j])
1887                                 master->cluster[j]->is_new = 0;
1888
1889                 /* Copy the new caller-supplied control values.
1890                    user_to_new() sets 'is_new' to 1. */
1891                 ret = cluster_walk(i, cs, helpers, user_to_new);
1892
1893                 if (!ret)
1894                         ret = try_or_set_control_cluster(fh, master, set);
1895
1896                 /* Copy the new values back to userspace. */
1897                 if (!ret)
1898                         ret = cluster_walk(i, cs, helpers, new_to_user);
1899
1900                 v4l2_ctrl_unlock(ctrl);
1901                 cluster_done(i, cs, helpers);
1902         }
1903         return ret;
1904 }
1905
1906 /* Try or try-and-set controls */
1907 static int try_set_ext_ctrls(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
1908                              struct v4l2_ext_controls *cs,
1909                              bool set)
1910 {
1911         struct ctrl_helper helper[4];
1912         struct ctrl_helper *helpers = helper;
1913         int ret;
1914         int i;
1915
1916         cs->error_idx = cs->count;
1917         cs->ctrl_class = V4L2_CTRL_ID2CLASS(cs->ctrl_class);
1918
1919         if (hdl == NULL)
1920                 return -EINVAL;
1921
1922         if (cs->count == 0)
1923                 return class_check(hdl, cs->ctrl_class);
1924
1925         if (cs->count > ARRAY_SIZE(helper)) {
1926                 helpers = kmalloc(sizeof(helper[0]) * cs->count, GFP_KERNEL);
1927                 if (!helpers)
1928                         return -ENOMEM;
1929         }
1930         ret = prepare_ext_ctrls(hdl, cs, helpers);
1931
1932         /* First 'try' all controls and abort on error */
1933         if (!ret)
1934                 ret = try_or_set_ext_ctrls(NULL, hdl, cs, helpers, false);
1935         /* If this is a 'set' operation and the initial 'try' failed,
1936            then set error_idx to count to tell the application that no
1937            controls changed value yet. */
1938         if (set)
1939                 cs->error_idx = cs->count;
1940         if (!ret && set) {
1941                 /* Reset 'handled' state */
1942                 for (i = 0; i < cs->count; i++)
1943                         helpers[i].handled = false;
1944                 ret = try_or_set_ext_ctrls(fh, hdl, cs, helpers, true);
1945         }
1946
1947         if (cs->count > ARRAY_SIZE(helper))
1948                 kfree(helpers);
1949         return ret;
1950 }
1951
1952 int v4l2_try_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *cs)
1953 {
1954         return try_set_ext_ctrls(NULL, hdl, cs, false);
1955 }
1956 EXPORT_SYMBOL(v4l2_try_ext_ctrls);
1957
1958 int v4l2_s_ext_ctrls(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
1959                                         struct v4l2_ext_controls *cs)
1960 {
1961         return try_set_ext_ctrls(fh, hdl, cs, true);
1962 }
1963 EXPORT_SYMBOL(v4l2_s_ext_ctrls);
1964
1965 int v4l2_subdev_try_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs)
1966 {
1967         return try_set_ext_ctrls(NULL, sd->ctrl_handler, cs, false);
1968 }
1969 EXPORT_SYMBOL(v4l2_subdev_try_ext_ctrls);
1970
1971 int v4l2_subdev_s_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs)
1972 {
1973         return try_set_ext_ctrls(NULL, sd->ctrl_handler, cs, true);
1974 }
1975 EXPORT_SYMBOL(v4l2_subdev_s_ext_ctrls);
1976
1977 /* Helper function for VIDIOC_S_CTRL compatibility */
1978 static int set_ctrl(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, s32 *val)
1979 {
1980         struct v4l2_ctrl *master = ctrl->cluster[0];
1981         int ret;
1982         int i;
1983
1984         v4l2_ctrl_lock(ctrl);
1985
1986         /* Reset the 'is_new' flags of the cluster */
1987         for (i = 0; i < master->ncontrols; i++)
1988                 if (master->cluster[i])
1989                         master->cluster[i]->is_new = 0;
1990
1991         ctrl->val = *val;
1992         ctrl->is_new = 1;
1993         ret = try_or_set_control_cluster(NULL, master, false);
1994         if (!ret)
1995                 ret = try_or_set_control_cluster(fh, master, true);
1996         *val = ctrl->cur.val;
1997         v4l2_ctrl_unlock(ctrl);
1998         return ret;
1999 }
2000
2001 int v4l2_s_ctrl(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
2002                                         struct v4l2_control *control)
2003 {
2004         struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, control->id);
2005
2006         if (ctrl == NULL || !type_is_int(ctrl))
2007                 return -EINVAL;
2008
2009         if (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY)
2010                 return -EACCES;
2011
2012         return set_ctrl(fh, ctrl, &control->value);
2013 }
2014 EXPORT_SYMBOL(v4l2_s_ctrl);
2015
2016 int v4l2_subdev_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *control)
2017 {
2018         return v4l2_s_ctrl(NULL, sd->ctrl_handler, control);
2019 }
2020 EXPORT_SYMBOL(v4l2_subdev_s_ctrl);
2021
2022 int v4l2_ctrl_s_ctrl(struct v4l2_ctrl *ctrl, s32 val)
2023 {
2024         /* It's a driver bug if this happens. */
2025         WARN_ON(!type_is_int(ctrl));
2026         return set_ctrl(NULL, ctrl, &val);
2027 }
2028 EXPORT_SYMBOL(v4l2_ctrl_s_ctrl);
2029
2030 void v4l2_ctrl_add_fh(struct v4l2_ctrl_handler *hdl,
2031                 struct v4l2_ctrl_fh *ctrl_fh,
2032                 struct v4l2_event_subscription *sub)
2033 {
2034         struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, sub->id);
2035
2036         v4l2_ctrl_lock(ctrl);
2037         list_add_tail(&ctrl_fh->node, &ctrl->fhs);
2038         if (ctrl->type != V4L2_CTRL_TYPE_CTRL_CLASS &&
2039             (sub->flags & V4L2_EVENT_SUB_FL_SEND_INITIAL)) {
2040                 struct v4l2_event ev;
2041
2042                 fill_event(&ev, ctrl, V4L2_EVENT_CTRL_CH_VALUE |
2043                         V4L2_EVENT_CTRL_CH_FLAGS);
2044                 v4l2_event_queue_fh(ctrl_fh->fh, &ev);
2045         }
2046         v4l2_ctrl_unlock(ctrl);
2047 }
2048 EXPORT_SYMBOL(v4l2_ctrl_add_fh);
2049
2050 void v4l2_ctrl_del_fh(struct v4l2_ctrl *ctrl, struct v4l2_fh *fh)
2051 {
2052         struct v4l2_ctrl_fh *pos;
2053
2054         v4l2_ctrl_lock(ctrl);
2055         list_for_each_entry(pos, &ctrl->fhs, node) {
2056                 if (pos->fh == fh) {
2057                         list_del(&pos->node);
2058                         kfree(pos);
2059                         break;
2060                 }
2061         }
2062         v4l2_ctrl_unlock(ctrl);
2063 }
2064 EXPORT_SYMBOL(v4l2_ctrl_del_fh);
2065
2066 int v4l2_ctrl_subscribe_fh(struct v4l2_fh *fh,
2067                         struct v4l2_event_subscription *sub, unsigned n)
2068 {
2069         struct v4l2_ctrl_handler *hdl = fh->ctrl_handler;
2070         int ret = 0;
2071
2072         if (!fh->events)
2073                 ret = v4l2_event_init(fh);
2074         if (!ret) {
2075                 if (hdl->nr_of_refs * 2 > n)
2076                         n = hdl->nr_of_refs * 2;
2077                 ret = v4l2_event_alloc(fh, n);
2078         }
2079         if (!ret)
2080                 ret = v4l2_event_subscribe(fh, sub);
2081         return ret;
2082 }
2083 EXPORT_SYMBOL(v4l2_ctrl_subscribe_fh);