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 <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_video_encoding[] = {
 179                 "MPEG-1",
 180                 "MPEG-2",
 181                 "MPEG-4 AVC",
 182                 NULL
 183         };
 184         static const char * const mpeg_video_aspect[] = {
 185                 "1x1",
 186                 "4x3",
 187                 "16x9",
 188                 "2.21x1",
 189                 NULL
 190         };
 191         static const char * const mpeg_video_bitrate_mode[] = {
 192                 "Variable Bitrate",
 193                 "Constant Bitrate",
 194                 NULL
 195         };
 196         static const char * const mpeg_stream_type[] = {
 197                 "MPEG-2 Program Stream",
 198                 "MPEG-2 Transport Stream",
 199                 "MPEG-1 System Stream",
 200                 "MPEG-2 DVD-compatible Stream",
 201                 "MPEG-1 VCD-compatible Stream",
 202                 "MPEG-2 SVCD-compatible Stream",
 203                 NULL
 204         };
 205         static const char * const mpeg_stream_vbi_fmt[] = {
 206                 "No VBI",
 207                 "Private Packet, IVTV Format",
 208                 NULL
 209         };
 210         static const char * const camera_power_line_frequency[] = {
 211                 "Disabled",
 212                 "50 Hz",
 213                 "60 Hz",
 214                 "Auto",
 215                 NULL
 216         };
 217         static const char * const camera_exposure_auto[] = {
 218                 "Auto Mode",
 219                 "Manual Mode",
 220                 "Shutter Priority Mode",
 221                 "Aperture Priority Mode",
 222                 NULL
 223         };
 224         static const char * const colorfx[] = {
 225                 "None",
 226                 "Black & White",
 227                 "Sepia",
 228                 "Negative",
 229                 "Emboss",
 230                 "Sketch",
 231                 "Sky Blue",
 232                 "Grass Green",
 233                 "Skin Whiten",
 234                 "Vivid",
 235                 NULL
 236         };
 237         static const char * const tune_preemphasis[] = {
 238                 "No Preemphasis",
 239                 "50 useconds",
 240                 "75 useconds",
 241                 NULL,
 242         };
 243         static const char * const header_mode[] = {
 244                 "Separate Buffer",
 245                 "Joined With 1st Frame",
 246                 NULL,
 247         };
 248         static const char * const multi_slice[] = {
 249                 "Single",
 250                 "Max Macroblocks",
 251                 "Max Bytes",
 252                 NULL,
 253         };
 254         static const char * const entropy_mode[] = {
 255                 "CAVLC",
 256                 "CABAC",
 257                 NULL,
 258         };
 259         static const char * const mpeg_h264_level[] = {
 260                 "1",
 261                 "1b",
 262                 "1.1",
 263                 "1.2",
 264                 "1.3",
 265                 "2",
 266                 "2.1",
 267                 "2.2",
 268                 "3",
 269                 "3.1",
 270                 "3.2",
 271                 "4",
 272                 "4.1",
 273                 "4.2",
 274                 "5",
 275                 "5.1",
 276                 NULL,
 277         };
 278         static const char * const h264_loop_filter[] = {
 279                 "Enabled",
 280                 "Disabled",
 281                 "Disabled at Slice Boundary",
 282                 NULL,
 283         };
 284         static const char * const h264_profile[] = {
 285                 "Baseline",
 286                 "Constrained Baseline",
 287                 "Main",
 288                 "Extended",
 289                 "High",
 290                 "High 10",
 291                 "High 422",
 292                 "High 444 Predictive",
 293                 "High 10 Intra",
 294                 "High 422 Intra",
 295                 "High 444 Intra",
 296                 "CAVLC 444 Intra",
 297                 "Scalable Baseline",
 298                 "Scalable High",
 299                 "Scalable High Intra",
 300                 "Multiview High",
 301                 NULL,
 302         };
 303         static const char * const vui_sar_idc[] = {
 304                 "Unspecified",
 305                 "1:1",
 306                 "12:11",
 307                 "10:11",
 308                 "16:11",
 309                 "40:33",
 310                 "24:11",
 311                 "20:11",
 312                 "32:11",
 313                 "80:33",
 314                 "18:11",
 315                 "15:11",
 316                 "64:33",
 317                 "160:99",
 318                 "4:3",
 319                 "3:2",
 320                 "2:1",
 321                 "Extended SAR",
 322                 NULL,
 323         };
 324         static const char * const mpeg_mpeg4_level[] = {
 325                 "0",
 326                 "0b",
 327                 "1",
 328                 "2",
 329                 "3",
 330                 "3b",
 331                 "4",
 332                 "5",
 333                 NULL,
 334         };
 335         static const char * const mpeg4_profile[] = {
 336                 "Simple",
 337                 "Adcanved Simple",
 338                 "Core",
 339                 "Simple Scalable",
 340                 "Advanced Coding Efficency",
 341                 NULL,
 342         };
 343
 344         static const char * const flash_led_mode[] = {
 345                 "Off",
 346                 "Flash",
 347                 "Torch",
 348                 NULL,
 349         };
 350         static const char * const flash_strobe_source[] = {
 351                 "Software",
 352                 "External",
 353                 NULL,
 354         };
 355
 356         switch (id) {
 357         case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ:
 358                 return mpeg_audio_sampling_freq;
 359         case V4L2_CID_MPEG_AUDIO_ENCODING:
 360                 return mpeg_audio_encoding;
 361         case V4L2_CID_MPEG_AUDIO_L1_BITRATE:
 362                 return mpeg_audio_l1_bitrate;
 363         case V4L2_CID_MPEG_AUDIO_L2_BITRATE:
 364                 return mpeg_audio_l2_bitrate;
 365         case V4L2_CID_MPEG_AUDIO_L3_BITRATE:
 366                 return mpeg_audio_l3_bitrate;
 367         case V4L2_CID_MPEG_AUDIO_AC3_BITRATE:
 368                 return mpeg_audio_ac3_bitrate;
 369         case V4L2_CID_MPEG_AUDIO_MODE:
 370                 return mpeg_audio_mode;
 371         case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION:
 372                 return mpeg_audio_mode_extension;
 373         case V4L2_CID_MPEG_AUDIO_EMPHASIS:
 374                 return mpeg_audio_emphasis;
 375         case V4L2_CID_MPEG_AUDIO_CRC:
 376                 return mpeg_audio_crc;
 377         case V4L2_CID_MPEG_VIDEO_ENCODING:
 378                 return mpeg_video_encoding;
 379         case V4L2_CID_MPEG_VIDEO_ASPECT:
 380                 return mpeg_video_aspect;
 381         case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
 382                 return mpeg_video_bitrate_mode;
 383         case V4L2_CID_MPEG_STREAM_TYPE:
 384                 return mpeg_stream_type;
 385         case V4L2_CID_MPEG_STREAM_VBI_FMT:
 386                 return mpeg_stream_vbi_fmt;
 387         case V4L2_CID_POWER_LINE_FREQUENCY:
 388                 return camera_power_line_frequency;
 389         case V4L2_CID_EXPOSURE_AUTO:
 390                 return camera_exposure_auto;
 391         case V4L2_CID_COLORFX:
 392                 return colorfx;
 393         case V4L2_CID_TUNE_PREEMPHASIS:
 394                 return tune_preemphasis;
 395         case V4L2_CID_FLASH_LED_MODE:
 396                 return flash_led_mode;
 397         case V4L2_CID_FLASH_STROBE_SOURCE:
 398                 return flash_strobe_source;
 399         case V4L2_CID_MPEG_VIDEO_HEADER_MODE:
 400                 return header_mode;
 401         case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE:
 402                 return multi_slice;
 403         case V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE:
 404                 return entropy_mode;
 405         case V4L2_CID_MPEG_VIDEO_H264_LEVEL:
 406                 return mpeg_h264_level;
 407         case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE:
 408                 return h264_loop_filter;
 409         case V4L2_CID_MPEG_VIDEO_H264_PROFILE:
 410                 return h264_profile;
 411         case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC:
 412                 return vui_sar_idc;
 413         case V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL:
 414                 return mpeg_mpeg4_level;
 415         case V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE:
 416                 return mpeg4_profile;
 417         default:
 418                 return NULL;
 419         }
 420 }
 421 EXPORT_SYMBOL(v4l2_ctrl_get_menu);
 422
 423 /* Return the control name. */
 424 const char *v4l2_ctrl_get_name(u32 id)
 425 {
 426         switch (id) {
 427         /* USER controls */
 428         /* Keep the order of the 'case's the same as in videodev2.h! */
 429         case V4L2_CID_USER_CLASS:               return "User Controls";
 430         case V4L2_CID_BRIGHTNESS:               return "Brightness";
 431         case V4L2_CID_CONTRAST:                 return "Contrast";
 432         case V4L2_CID_SATURATION:               return "Saturation";
 433         case V4L2_CID_HUE:                      return "Hue";
 434         case V4L2_CID_AUDIO_VOLUME:             return "Volume";
 435         case V4L2_CID_AUDIO_BALANCE:            return "Balance";
 436         case V4L2_CID_AUDIO_BASS:               return "Bass";
 437         case V4L2_CID_AUDIO_TREBLE:             return "Treble";
 438         case V4L2_CID_AUDIO_MUTE:               return "Mute";
 439         case V4L2_CID_AUDIO_LOUDNESS:           return "Loudness";
 440         case V4L2_CID_BLACK_LEVEL:              return "Black Level";
 441         case V4L2_CID_AUTO_WHITE_BALANCE:       return "White Balance, Automatic";
 442         case V4L2_CID_DO_WHITE_BALANCE:         return "Do White Balance";
 443         case V4L2_CID_RED_BALANCE:              return "Red Balance";
 444         case V4L2_CID_BLUE_BALANCE:             return "Blue Balance";
 445         case V4L2_CID_GAMMA:                    return "Gamma";
 446         case V4L2_CID_EXPOSURE:                 return "Exposure";
 447         case V4L2_CID_AUTOGAIN:                 return "Gain, Automatic";
 448         case V4L2_CID_GAIN:                     return "Gain";
 449         case V4L2_CID_HFLIP:                    return "Horizontal Flip";
 450         case V4L2_CID_VFLIP:                    return "Vertical Flip";
 451         case V4L2_CID_HCENTER:                  return "Horizontal Center";
 452         case V4L2_CID_VCENTER:                  return "Vertical Center";
 453         case V4L2_CID_POWER_LINE_FREQUENCY:     return "Power Line Frequency";
 454         case V4L2_CID_HUE_AUTO:                 return "Hue, Automatic";
 455         case V4L2_CID_WHITE_BALANCE_TEMPERATURE: return "White Balance Temperature";
 456         case V4L2_CID_SHARPNESS:                return "Sharpness";
 457         case V4L2_CID_BACKLIGHT_COMPENSATION:   return "Backlight Compensation";
 458         case V4L2_CID_CHROMA_AGC:               return "Chroma AGC";
 459         case V4L2_CID_COLOR_KILLER:             return "Color Killer";
 460         case V4L2_CID_COLORFX:                  return "Color Effects";
 461         case V4L2_CID_AUTOBRIGHTNESS:           return "Brightness, Automatic";
 462         case V4L2_CID_BAND_STOP_FILTER:         return "Band-Stop Filter";
 463         case V4L2_CID_ROTATE:                   return "Rotate";
 464         case V4L2_CID_BG_COLOR:                 return "Background Color";
 465         case V4L2_CID_CHROMA_GAIN:              return "Chroma Gain";
 466         case V4L2_CID_ILLUMINATORS_1:           return "Illuminator 1";
 467         case V4L2_CID_ILLUMINATORS_2:           return "Illuminator 2";
 468         case V4L2_CID_MIN_BUFFERS_FOR_CAPTURE:  return "Minimum Number of Capture Buffers";
 469         case V4L2_CID_MIN_BUFFERS_FOR_OUTPUT:   return "Minimum Number of Output Buffers";
 470
 471         /* MPEG controls */
 472         /* Keep the order of the 'case's the same as in videodev2.h! */
 473         case V4L2_CID_MPEG_CLASS:               return "MPEG Encoder Controls";
 474         case V4L2_CID_MPEG_STREAM_TYPE:         return "Stream Type";
 475         case V4L2_CID_MPEG_STREAM_PID_PMT:      return "Stream PMT Program ID";
 476         case V4L2_CID_MPEG_STREAM_PID_AUDIO:    return "Stream Audio Program ID";
 477         case V4L2_CID_MPEG_STREAM_PID_VIDEO:    return "Stream Video Program ID";
 478         case V4L2_CID_MPEG_STREAM_PID_PCR:      return "Stream PCR Program ID";
 479         case V4L2_CID_MPEG_STREAM_PES_ID_AUDIO: return "Stream PES Audio ID";
 480         case V4L2_CID_MPEG_STREAM_PES_ID_VIDEO: return "Stream PES Video ID";
 481         case V4L2_CID_MPEG_STREAM_VBI_FMT:      return "Stream VBI Format";
 482         case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ: return "Audio Sampling Frequency";
 483         case V4L2_CID_MPEG_AUDIO_ENCODING:      return "Audio Encoding";
 484         case V4L2_CID_MPEG_AUDIO_L1_BITRATE:    return "Audio Layer I Bitrate";
 485         case V4L2_CID_MPEG_AUDIO_L2_BITRATE:    return "Audio Layer II Bitrate";
 486         case V4L2_CID_MPEG_AUDIO_L3_BITRATE:    return "Audio Layer III Bitrate";
 487         case V4L2_CID_MPEG_AUDIO_MODE:          return "Audio Stereo Mode";
 488         case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION: return "Audio Stereo Mode Extension";
 489         case V4L2_CID_MPEG_AUDIO_EMPHASIS:      return "Audio Emphasis";
 490         case V4L2_CID_MPEG_AUDIO_CRC:           return "Audio CRC";
 491         case V4L2_CID_MPEG_AUDIO_MUTE:          return "Audio Mute";
 492         case V4L2_CID_MPEG_AUDIO_AAC_BITRATE:   return "Audio AAC Bitrate";
 493         case V4L2_CID_MPEG_AUDIO_AC3_BITRATE:   return "Audio AC-3 Bitrate";
 494         case V4L2_CID_MPEG_VIDEO_ENCODING:      return "Video Encoding";
 495         case V4L2_CID_MPEG_VIDEO_ASPECT:        return "Video Aspect";
 496         case V4L2_CID_MPEG_VIDEO_B_FRAMES:      return "Video B Frames";
 497         case V4L2_CID_MPEG_VIDEO_GOP_SIZE:      return "Video GOP Size";
 498         case V4L2_CID_MPEG_VIDEO_GOP_CLOSURE:   return "Video GOP Closure";
 499         case V4L2_CID_MPEG_VIDEO_PULLDOWN:      return "Video Pulldown";
 500         case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:  return "Video Bitrate Mode";
 501         case V4L2_CID_MPEG_VIDEO_BITRATE:       return "Video Bitrate";
 502         case V4L2_CID_MPEG_VIDEO_BITRATE_PEAK:  return "Video Peak Bitrate";
 503         case V4L2_CID_MPEG_VIDEO_TEMPORAL_DECIMATION: return "Video Temporal Decimation";
 504         case V4L2_CID_MPEG_VIDEO_MUTE:          return "Video Mute";
 505         case V4L2_CID_MPEG_VIDEO_MUTE_YUV:      return "Video Mute YUV";
 506         case V4L2_CID_MPEG_VIDEO_DECODER_SLICE_INTERFACE:       return "Decoder Slice Interface";
 507         case V4L2_CID_MPEG_VIDEO_DECODER_MPEG4_DEBLOCK_FILTER:  return "MPEG4 Loop Filter Enable";
 508         case V4L2_CID_MPEG_VIDEO_CYCLIC_INTRA_REFRESH_MB:       return "The Number of Intra Refresh MBs";
 509         case V4L2_CID_MPEG_VIDEO_FRAME_RC_ENABLE:               return "Frame Level Rate Control Enable";
 510         case V4L2_CID_MPEG_VIDEO_MB_RC_ENABLE:                  return "H264 MB Level Rate Control";
 511         case V4L2_CID_MPEG_VIDEO_HEADER_MODE:                   return "Sequence Header Mode";
 512         case V4L2_CID_MPEG_VIDEO_MAX_REF_PIC:                   return "The Max Number of Reference Picture";
 513         case V4L2_CID_MPEG_VIDEO_H263_I_FRAME_QP:               return "H263 I-Frame QP Value";
 514         case V4L2_CID_MPEG_VIDEO_H263_P_FRAME_QP:               return "H263 P frame QP Value";
 515         case V4L2_CID_MPEG_VIDEO_H263_B_FRAME_QP:               return "H263 B frame QP Value";
 516         case V4L2_CID_MPEG_VIDEO_H263_MIN_QP:                   return "H263 Minimum QP Value";
 517         case V4L2_CID_MPEG_VIDEO_H263_MAX_QP:                   return "H263 Maximum QP Value";
 518         case V4L2_CID_MPEG_VIDEO_H264_I_FRAME_QP:               return "H264 I-Frame QP Value";
 519         case V4L2_CID_MPEG_VIDEO_H264_P_FRAME_QP:               return "H264 P frame QP Value";
 520         case V4L2_CID_MPEG_VIDEO_H264_B_FRAME_QP:               return "H264 B frame QP Value";
 521         case V4L2_CID_MPEG_VIDEO_H264_MAX_QP:                   return "H264 Maximum QP Value";
 522         case V4L2_CID_MPEG_VIDEO_H264_MIN_QP:                   return "H264 Minimum QP Value";
 523         case V4L2_CID_MPEG_VIDEO_H264_8X8_TRANSFORM:            return "H264 8x8 Transform Enable";
 524         case V4L2_CID_MPEG_VIDEO_H264_CPB_SIZE:                 return "H264 CPB Buffer Size";
 525         case V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE:             return "H264 Entorpy Mode";
 526         case V4L2_CID_MPEG_VIDEO_H264_I_PERIOD:                 return "H264 I Period";
 527         case V4L2_CID_MPEG_VIDEO_H264_LEVEL:                    return "H264 Level";
 528         case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_ALPHA:        return "H264 Loop Filter Alpha Offset";
 529         case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_BETA:         return "H264 Loop Filter Beta Offset";
 530         case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE:         return "H264 Loop Filter Mode";
 531         case V4L2_CID_MPEG_VIDEO_H264_PROFILE:                  return "H264 Profile";
 532         case V4L2_CID_MPEG_VIDEO_H264_VUI_EXT_SAR_HEIGHT:       return "Vertical Size of SAR";
 533         case V4L2_CID_MPEG_VIDEO_H264_VUI_EXT_SAR_WIDTH:        return "Horizontal Size of SAR";
 534         case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_ENABLE:           return "Aspect Ratio VUI Enable";
 535         case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC:              return "VUI Aspect Ratio IDC";
 536         case V4L2_CID_MPEG_VIDEO_MPEG4_I_FRAME_QP:              return "MPEG4 I-Frame QP Value";
 537         case V4L2_CID_MPEG_VIDEO_MPEG4_P_FRAME_QP:              return "MPEG4 P frame QP Value";
 538         case V4L2_CID_MPEG_VIDEO_MPEG4_B_FRAME_QP:              return "MPEG4 B frame QP Value";
 539         case V4L2_CID_MPEG_VIDEO_MPEG4_MIN_QP:                  return "MPEG4 Minimum QP Value";
 540         case V4L2_CID_MPEG_VIDEO_MPEG4_MAX_QP:                  return "MPEG4 Maximum QP Value";
 541         case V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL:                   return "MPEG4 Level";
 542         case V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE:                 return "MPEG4 Profile";
 543         case V4L2_CID_MPEG_VIDEO_MPEG4_QPEL:                    return "Quarter Pixel Search Enable";
 544         case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MAX_BYTES:         return "The Maximum Bytes Per Slice";
 545         case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MAX_MB:            return "The Number of MB in a Slice";
 546         case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE:              return "The Slice Partitioning Method";
 547         case V4L2_CID_MPEG_VIDEO_VBV_SIZE:                      return "VBV Buffer Size";
 548
 549         /* CAMERA controls */
 550         /* Keep the order of the 'case's the same as in videodev2.h! */
 551         case V4L2_CID_CAMERA_CLASS:             return "Camera Controls";
 552         case V4L2_CID_EXPOSURE_AUTO:            return "Auto Exposure";
 553         case V4L2_CID_EXPOSURE_ABSOLUTE:        return "Exposure Time, Absolute";
 554         case V4L2_CID_EXPOSURE_AUTO_PRIORITY:   return "Exposure, Dynamic Framerate";
 555         case V4L2_CID_PAN_RELATIVE:             return "Pan, Relative";
 556         case V4L2_CID_TILT_RELATIVE:            return "Tilt, Relative";
 557         case V4L2_CID_PAN_RESET:                return "Pan, Reset";
 558         case V4L2_CID_TILT_RESET:               return "Tilt, Reset";
 559         case V4L2_CID_PAN_ABSOLUTE:             return "Pan, Absolute";
 560         case V4L2_CID_TILT_ABSOLUTE:            return "Tilt, Absolute";
 561         case V4L2_CID_FOCUS_ABSOLUTE:           return "Focus, Absolute";
 562         case V4L2_CID_FOCUS_RELATIVE:           return "Focus, Relative";
 563         case V4L2_CID_FOCUS_AUTO:               return "Focus, Automatic";
 564         case V4L2_CID_ZOOM_ABSOLUTE:            return "Zoom, Absolute";
 565         case V4L2_CID_ZOOM_RELATIVE:            return "Zoom, Relative";
 566         case V4L2_CID_ZOOM_CONTINUOUS:          return "Zoom, Continuous";
 567         case V4L2_CID_PRIVACY:                  return "Privacy";
 568         case V4L2_CID_IRIS_ABSOLUTE:            return "Iris, Absolute";
 569         case V4L2_CID_IRIS_RELATIVE:            return "Iris, Relative";
 570
 571         /* FM Radio Modulator control */
 572         /* Keep the order of the 'case's the same as in videodev2.h! */
 573         case V4L2_CID_FM_TX_CLASS:              return "FM Radio Modulator Controls";
 574         case V4L2_CID_RDS_TX_DEVIATION:         return "RDS Signal Deviation";
 575         case V4L2_CID_RDS_TX_PI:                return "RDS Program ID";
 576         case V4L2_CID_RDS_TX_PTY:               return "RDS Program Type";
 577         case V4L2_CID_RDS_TX_PS_NAME:           return "RDS PS Name";
 578         case V4L2_CID_RDS_TX_RADIO_TEXT:        return "RDS Radio Text";
 579         case V4L2_CID_AUDIO_LIMITER_ENABLED:    return "Audio Limiter Feature Enabled";
 580         case V4L2_CID_AUDIO_LIMITER_RELEASE_TIME: return "Audio Limiter Release Time";
 581         case V4L2_CID_AUDIO_LIMITER_DEVIATION:  return "Audio Limiter Deviation";
 582         case V4L2_CID_AUDIO_COMPRESSION_ENABLED: return "Audio Compression Feature Enabled";
 583         case V4L2_CID_AUDIO_COMPRESSION_GAIN:   return "Audio Compression Gain";
 584         case V4L2_CID_AUDIO_COMPRESSION_THRESHOLD: return "Audio Compression Threshold";
 585         case V4L2_CID_AUDIO_COMPRESSION_ATTACK_TIME: return "Audio Compression Attack Time";
 586         case V4L2_CID_AUDIO_COMPRESSION_RELEASE_TIME: return "Audio Compression Release Time";
 587         case V4L2_CID_PILOT_TONE_ENABLED:       return "Pilot Tone Feature Enabled";
 588         case V4L2_CID_PILOT_TONE_DEVIATION:     return "Pilot Tone Deviation";
 589         case V4L2_CID_PILOT_TONE_FREQUENCY:     return "Pilot Tone Frequency";
 590         case V4L2_CID_TUNE_PREEMPHASIS:         return "Pre-emphasis settings";
 591         case V4L2_CID_TUNE_POWER_LEVEL:         return "Tune Power Level";
 592         case V4L2_CID_TUNE_ANTENNA_CAPACITOR:   return "Tune Antenna Capacitor";
 593
 594         /* Flash controls */
 595         case V4L2_CID_FLASH_CLASS:              return "Flash controls";
 596         case V4L2_CID_FLASH_LED_MODE:           return "LED mode";
 597         case V4L2_CID_FLASH_STROBE_SOURCE:      return "Strobe source";
 598         case V4L2_CID_FLASH_STROBE:             return "Strobe";
 599         case V4L2_CID_FLASH_STROBE_STOP:        return "Stop strobe";
 600         case V4L2_CID_FLASH_STROBE_STATUS:      return "Strobe status";
 601         case V4L2_CID_FLASH_TIMEOUT:            return "Strobe timeout";
 602         case V4L2_CID_FLASH_INTENSITY:          return "Intensity, flash mode";
 603         case V4L2_CID_FLASH_TORCH_INTENSITY:    return "Intensity, torch mode";
 604         case V4L2_CID_FLASH_INDICATOR_INTENSITY: return "Intensity, indicator";
 605         case V4L2_CID_FLASH_FAULT:              return "Faults";
 606         case V4L2_CID_FLASH_CHARGE:             return "Charge";
 607         case V4L2_CID_FLASH_READY:              return "Ready to strobe";
 608
 609         default:
 610                 return NULL;
 611         }
 612 }
 613 EXPORT_SYMBOL(v4l2_ctrl_get_name);
 614
 615 void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type,
 616                     s32 *min, s32 *max, s32 *step, s32 *def, u32 *flags)
 617 {
 618         *name = v4l2_ctrl_get_name(id);
 619         *flags = 0;
 620
 621         switch (id) {
 622         case V4L2_CID_AUDIO_MUTE:
 623         case V4L2_CID_AUDIO_LOUDNESS:
 624         case V4L2_CID_AUTO_WHITE_BALANCE:
 625         case V4L2_CID_AUTOGAIN:
 626         case V4L2_CID_HFLIP:
 627         case V4L2_CID_VFLIP:
 628         case V4L2_CID_HUE_AUTO:
 629         case V4L2_CID_CHROMA_AGC:
 630         case V4L2_CID_COLOR_KILLER:
 631         case V4L2_CID_MPEG_AUDIO_MUTE:
 632         case V4L2_CID_MPEG_VIDEO_MUTE:
 633         case V4L2_CID_MPEG_VIDEO_GOP_CLOSURE:
 634         case V4L2_CID_MPEG_VIDEO_PULLDOWN:
 635         case V4L2_CID_EXPOSURE_AUTO_PRIORITY:
 636         case V4L2_CID_FOCUS_AUTO:
 637         case V4L2_CID_PRIVACY:
 638         case V4L2_CID_AUDIO_LIMITER_ENABLED:
 639         case V4L2_CID_AUDIO_COMPRESSION_ENABLED:
 640         case V4L2_CID_PILOT_TONE_ENABLED:
 641         case V4L2_CID_ILLUMINATORS_1:
 642         case V4L2_CID_ILLUMINATORS_2:
 643         case V4L2_CID_FLASH_STROBE_STATUS:
 644         case V4L2_CID_FLASH_CHARGE:
 645         case V4L2_CID_FLASH_READY:
 646         case V4L2_CID_MPEG_VIDEO_DECODER_MPEG4_DEBLOCK_FILTER:
 647         case V4L2_CID_MPEG_VIDEO_DECODER_SLICE_INTERFACE:
 648         case V4L2_CID_MPEG_VIDEO_FRAME_RC_ENABLE:
 649         case V4L2_CID_MPEG_VIDEO_MB_RC_ENABLE:
 650         case V4L2_CID_MPEG_VIDEO_H264_8X8_TRANSFORM:
 651         case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_ENABLE:
 652         case V4L2_CID_MPEG_VIDEO_MPEG4_QPEL:
 653                 *type = V4L2_CTRL_TYPE_BOOLEAN;
 654                 *min = 0;
 655                 *max = *step = 1;
 656                 break;
 657         case V4L2_CID_PAN_RESET:
 658         case V4L2_CID_TILT_RESET:
 659         case V4L2_CID_FLASH_STROBE:
 660         case V4L2_CID_FLASH_STROBE_STOP:
 661                 *type = V4L2_CTRL_TYPE_BUTTON;
 662                 *flags |= V4L2_CTRL_FLAG_WRITE_ONLY;
 663                 *min = *max = *step = *def = 0;
 664                 break;
 665         case V4L2_CID_POWER_LINE_FREQUENCY:
 666         case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ:
 667         case V4L2_CID_MPEG_AUDIO_ENCODING:
 668         case V4L2_CID_MPEG_AUDIO_L1_BITRATE:
 669         case V4L2_CID_MPEG_AUDIO_L2_BITRATE:
 670         case V4L2_CID_MPEG_AUDIO_L3_BITRATE:
 671         case V4L2_CID_MPEG_AUDIO_AC3_BITRATE:
 672         case V4L2_CID_MPEG_AUDIO_MODE:
 673         case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION:
 674         case V4L2_CID_MPEG_AUDIO_EMPHASIS:
 675         case V4L2_CID_MPEG_AUDIO_CRC:
 676         case V4L2_CID_MPEG_VIDEO_ENCODING:
 677         case V4L2_CID_MPEG_VIDEO_ASPECT:
 678         case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
 679         case V4L2_CID_MPEG_STREAM_TYPE:
 680         case V4L2_CID_MPEG_STREAM_VBI_FMT:
 681         case V4L2_CID_EXPOSURE_AUTO:
 682         case V4L2_CID_COLORFX:
 683         case V4L2_CID_TUNE_PREEMPHASIS:
 684         case V4L2_CID_FLASH_LED_MODE:
 685         case V4L2_CID_FLASH_STROBE_SOURCE:
 686         case V4L2_CID_MPEG_VIDEO_HEADER_MODE:
 687         case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE:
 688         case V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE:
 689         case V4L2_CID_MPEG_VIDEO_H264_LEVEL:
 690         case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE:
 691         case V4L2_CID_MPEG_VIDEO_H264_PROFILE:
 692         case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC:
 693         case V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL:
 694         case V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE:
 695                 *type = V4L2_CTRL_TYPE_MENU;
 696                 break;
 697         case V4L2_CID_RDS_TX_PS_NAME:
 698         case V4L2_CID_RDS_TX_RADIO_TEXT:
 699                 *type = V4L2_CTRL_TYPE_STRING;
 700                 break;
 701         case V4L2_CID_USER_CLASS:
 702         case V4L2_CID_CAMERA_CLASS:
 703         case V4L2_CID_MPEG_CLASS:
 704         case V4L2_CID_FM_TX_CLASS:
 705         case V4L2_CID_FLASH_CLASS:
 706                 *type = V4L2_CTRL_TYPE_CTRL_CLASS;
 707                 /* You can neither read not write these */
 708                 *flags |= V4L2_CTRL_FLAG_READ_ONLY | V4L2_CTRL_FLAG_WRITE_ONLY;
 709                 *min = *max = *step = *def = 0;
 710                 break;
 711         case V4L2_CID_BG_COLOR:
 712                 *type = V4L2_CTRL_TYPE_INTEGER;
 713                 *step = 1;
 714                 *min = 0;
 715                 /* Max is calculated as RGB888 that is 2^24 */
 716                 *max = 0xFFFFFF;
 717                 break;
 718         case V4L2_CID_FLASH_FAULT:
 719                 *type = V4L2_CTRL_TYPE_BITMASK;
 720                 break;
 721         case V4L2_CID_MIN_BUFFERS_FOR_CAPTURE:
 722         case V4L2_CID_MIN_BUFFERS_FOR_OUTPUT:
 723                 *type = V4L2_CTRL_TYPE_INTEGER;
 724                 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
 725                 break;
 726         default:
 727                 *type = V4L2_CTRL_TYPE_INTEGER;
 728                 break;
 729         }
 730         switch (id) {
 731         case V4L2_CID_MPEG_AUDIO_ENCODING:
 732         case V4L2_CID_MPEG_AUDIO_MODE:
 733         case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
 734         case V4L2_CID_MPEG_VIDEO_B_FRAMES:
 735         case V4L2_CID_MPEG_STREAM_TYPE:
 736                 *flags |= V4L2_CTRL_FLAG_UPDATE;
 737                 break;
 738         case V4L2_CID_AUDIO_VOLUME:
 739         case V4L2_CID_AUDIO_BALANCE:
 740         case V4L2_CID_AUDIO_BASS:
 741         case V4L2_CID_AUDIO_TREBLE:
 742         case V4L2_CID_BRIGHTNESS:
 743         case V4L2_CID_CONTRAST:
 744         case V4L2_CID_SATURATION:
 745         case V4L2_CID_HUE:
 746         case V4L2_CID_RED_BALANCE:
 747         case V4L2_CID_BLUE_BALANCE:
 748         case V4L2_CID_GAMMA:
 749         case V4L2_CID_SHARPNESS:
 750         case V4L2_CID_CHROMA_GAIN:
 751         case V4L2_CID_RDS_TX_DEVIATION:
 752         case V4L2_CID_AUDIO_LIMITER_RELEASE_TIME:
 753         case V4L2_CID_AUDIO_LIMITER_DEVIATION:
 754         case V4L2_CID_AUDIO_COMPRESSION_GAIN:
 755         case V4L2_CID_AUDIO_COMPRESSION_THRESHOLD:
 756         case V4L2_CID_AUDIO_COMPRESSION_ATTACK_TIME:
 757         case V4L2_CID_AUDIO_COMPRESSION_RELEASE_TIME:
 758         case V4L2_CID_PILOT_TONE_DEVIATION:
 759         case V4L2_CID_PILOT_TONE_FREQUENCY:
 760         case V4L2_CID_TUNE_POWER_LEVEL:
 761         case V4L2_CID_TUNE_ANTENNA_CAPACITOR:
 762                 *flags |= V4L2_CTRL_FLAG_SLIDER;
 763                 break;
 764         case V4L2_CID_PAN_RELATIVE:
 765         case V4L2_CID_TILT_RELATIVE:
 766         case V4L2_CID_FOCUS_RELATIVE:
 767         case V4L2_CID_IRIS_RELATIVE:
 768         case V4L2_CID_ZOOM_RELATIVE:
 769                 *flags |= V4L2_CTRL_FLAG_WRITE_ONLY;
 770                 break;
 771         case V4L2_CID_FLASH_STROBE_STATUS:
 772         case V4L2_CID_FLASH_READY:
 773                 *flags |= V4L2_CTRL_FLAG_READ_ONLY;
 774                 break;
 775         }
 776 }
 777 EXPORT_SYMBOL(v4l2_ctrl_fill);
 778
 779 /* Helper function to determine whether the control type is compatible with
 780    VIDIOC_G/S_CTRL. */
 781 static bool type_is_int(const struct v4l2_ctrl *ctrl)
 782 {
 783         switch (ctrl->type) {
 784         case V4L2_CTRL_TYPE_INTEGER64:
 785         case V4L2_CTRL_TYPE_STRING:
 786                 /* Nope, these need v4l2_ext_control */
 787                 return false;
 788         default:
 789                 return true;
 790         }
 791 }
 792
 793 static void fill_event(struct v4l2_event *ev, struct v4l2_ctrl *ctrl, u32 changes)
 794 {
 795         memset(ev->reserved, 0, sizeof(ev->reserved));
 796         ev->type = V4L2_EVENT_CTRL;
 797         ev->id = ctrl->id;
 798         ev->u.ctrl.changes = changes;
 799         ev->u.ctrl.type = ctrl->type;
 800         ev->u.ctrl.flags = ctrl->flags;
 801         if (ctrl->type == V4L2_CTRL_TYPE_STRING)
 802                 ev->u.ctrl.value64 = 0;
 803         else
 804                 ev->u.ctrl.value64 = ctrl->cur.val64;
 805         ev->u.ctrl.minimum = ctrl->minimum;
 806         ev->u.ctrl.maximum = ctrl->maximum;
 807         if (ctrl->type == V4L2_CTRL_TYPE_MENU)
 808                 ev->u.ctrl.step = 1;
 809         else
 810                 ev->u.ctrl.step = ctrl->step;
 811         ev->u.ctrl.default_value = ctrl->default_value;
 812 }
 813
 814 static void send_event(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, u32 changes)
 815 {
 816         struct v4l2_event ev;
 817         struct v4l2_subscribed_event *sev;
 818
 819         if (list_empty(&ctrl->ev_subs))
 820                 return;
 821         fill_event(&ev, ctrl, changes);
 822
 823         list_for_each_entry(sev, &ctrl->ev_subs, node)
 824                 if (sev->fh != fh ||
 825                     (sev->flags & V4L2_EVENT_SUB_FL_ALLOW_FEEDBACK))
 826                         v4l2_event_queue_fh(sev->fh, &ev);
 827 }
 828
 829 /* Helper function: copy the current control value back to the caller */
 830 static int cur_to_user(struct v4l2_ext_control *c,
 831                        struct v4l2_ctrl *ctrl)
 832 {
 833         u32 len;
 834
 835         switch (ctrl->type) {
 836         case V4L2_CTRL_TYPE_STRING:
 837                 len = strlen(ctrl->cur.string);
 838                 if (c->size < len + 1) {
 839                         c->size = len + 1;
 840                         return -ENOSPC;
 841                 }
 842                 return copy_to_user(c->string, ctrl->cur.string,
 843                                                 len + 1) ? -EFAULT : 0;
 844         case V4L2_CTRL_TYPE_INTEGER64:
 845                 c->value64 = ctrl->cur.val64;
 846                 break;
 847         default:
 848                 c->value = ctrl->cur.val;
 849                 break;
 850         }
 851         return 0;
 852 }
 853
 854 /* Helper function: copy the caller-provider value as the new control value */
 855 static int user_to_new(struct v4l2_ext_control *c,
 856                        struct v4l2_ctrl *ctrl)
 857 {
 858         int ret;
 859         u32 size;
 860
 861         ctrl->is_new = 1;
 862         switch (ctrl->type) {
 863         case V4L2_CTRL_TYPE_INTEGER64:
 864                 ctrl->val64 = c->value64;
 865                 break;
 866         case V4L2_CTRL_TYPE_STRING:
 867                 size = c->size;
 868                 if (size == 0)
 869                         return -ERANGE;
 870                 if (size > ctrl->maximum + 1)
 871                         size = ctrl->maximum + 1;
 872                 ret = copy_from_user(ctrl->string, c->string, size);
 873                 if (!ret) {
 874                         char last = ctrl->string[size - 1];
 875
 876                         ctrl->string[size - 1] = 0;
 877                         /* If the string was longer than ctrl->maximum,
 878                            then return an error. */
 879                         if (strlen(ctrl->string) == ctrl->maximum && last)
 880                                 return -ERANGE;
 881                 }
 882                 return ret ? -EFAULT : 0;
 883         default:
 884                 ctrl->val = c->value;
 885                 break;
 886         }
 887         return 0;
 888 }
 889
 890 /* Helper function: copy the new control value back to the caller */
 891 static int new_to_user(struct v4l2_ext_control *c,
 892                        struct v4l2_ctrl *ctrl)
 893 {
 894         u32 len;
 895
 896         switch (ctrl->type) {
 897         case V4L2_CTRL_TYPE_STRING:
 898                 len = strlen(ctrl->string);
 899                 if (c->size < len + 1) {
 900                         c->size = ctrl->maximum + 1;
 901                         return -ENOSPC;
 902                 }
 903                 return copy_to_user(c->string, ctrl->string,
 904                                                 len + 1) ? -EFAULT : 0;
 905         case V4L2_CTRL_TYPE_INTEGER64:
 906                 c->value64 = ctrl->val64;
 907                 break;
 908         default:
 909                 c->value = ctrl->val;
 910                 break;
 911         }
 912         return 0;
 913 }
 914
 915 /* Copy the new value to the current value. */
 916 static void new_to_cur(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl,
 917                                                 bool update_inactive)
 918 {
 919         bool changed = false;
 920
 921         if (ctrl == NULL)
 922                 return;
 923         switch (ctrl->type) {
 924         case V4L2_CTRL_TYPE_BUTTON:
 925                 changed = true;
 926                 break;
 927         case V4L2_CTRL_TYPE_STRING:
 928                 /* strings are always 0-terminated */
 929                 changed = strcmp(ctrl->string, ctrl->cur.string);
 930                 strcpy(ctrl->cur.string, ctrl->string);
 931                 break;
 932         case V4L2_CTRL_TYPE_INTEGER64:
 933                 changed = ctrl->val64 != ctrl->cur.val64;
 934                 ctrl->cur.val64 = ctrl->val64;
 935                 break;
 936         default:
 937                 changed = ctrl->val != ctrl->cur.val;
 938                 ctrl->cur.val = ctrl->val;
 939                 break;
 940         }
 941         if (update_inactive) {
 942                 /* Note: update_inactive can only be true for auto clusters. */
 943                 ctrl->flags &=
 944                         ~(V4L2_CTRL_FLAG_INACTIVE | V4L2_CTRL_FLAG_VOLATILE);
 945                 if (!is_cur_manual(ctrl->cluster[0])) {
 946                         ctrl->flags |= V4L2_CTRL_FLAG_INACTIVE;
 947                         if (ctrl->cluster[0]->has_volatiles)
 948                                 ctrl->flags |= V4L2_CTRL_FLAG_VOLATILE;
 949                 }
 950                 fh = NULL;
 951         }
 952         if (changed || update_inactive) {
 953                 /* If a control was changed that was not one of the controls
 954                    modified by the application, then send the event to all. */
 955                 if (!ctrl->is_new)
 956                         fh = NULL;
 957                 send_event(fh, ctrl,
 958                         (changed ? V4L2_EVENT_CTRL_CH_VALUE : 0) |
 959                         (update_inactive ? V4L2_EVENT_CTRL_CH_FLAGS : 0));
 960         }
 961 }
 962
 963 /* Copy the current value to the new value */
 964 static void cur_to_new(struct v4l2_ctrl *ctrl)
 965 {
 966         if (ctrl == NULL)
 967                 return;
 968         switch (ctrl->type) {
 969         case V4L2_CTRL_TYPE_STRING:
 970                 /* strings are always 0-terminated */
 971                 strcpy(ctrl->string, ctrl->cur.string);
 972                 break;
 973         case V4L2_CTRL_TYPE_INTEGER64:
 974                 ctrl->val64 = ctrl->cur.val64;
 975                 break;
 976         default:
 977                 ctrl->val = ctrl->cur.val;
 978                 break;
 979         }
 980 }
 981
 982 /* Return non-zero if one or more of the controls in the cluster has a new
 983    value that differs from the current value. */
 984 static int cluster_changed(struct v4l2_ctrl *master)
 985 {
 986         int diff = 0;
 987         int i;
 988
 989         for (i = 0; !diff && i < master->ncontrols; i++) {
 990                 struct v4l2_ctrl *ctrl = master->cluster[i];
 991
 992                 if (ctrl == NULL)
 993                         continue;
 994                 switch (ctrl->type) {
 995                 case V4L2_CTRL_TYPE_BUTTON:
 996                         /* Button controls are always 'different' */
 997                         return 1;
 998                 case V4L2_CTRL_TYPE_STRING:
 999                         /* strings are always 0-terminated */
1000                         diff = strcmp(ctrl->string, ctrl->cur.string);
1001                         break;
1002                 case V4L2_CTRL_TYPE_INTEGER64:
1003                         diff = ctrl->val64 != ctrl->cur.val64;
1004                         break;
1005                 default:
1006                         diff = ctrl->val != ctrl->cur.val;
1007                         break;
1008                 }
1009         }
1010         return diff;
1011 }
1012
1013 /* Validate integer-type control */
1014 static int validate_new_int(const struct v4l2_ctrl *ctrl, s32 *pval)
1015 {
1016         s32 val = *pval;
1017         u32 offset;
1018
1019         switch (ctrl->type) {
1020         case V4L2_CTRL_TYPE_INTEGER:
1021                 /* Round towards the closest legal value */
1022                 val += ctrl->step / 2;
1023                 if (val < ctrl->minimum)
1024                         val = ctrl->minimum;
1025                 if (val > ctrl->maximum)
1026                         val = ctrl->maximum;
1027                 offset = val - ctrl->minimum;
1028                 offset = ctrl->step * (offset / ctrl->step);
1029                 val = ctrl->minimum + offset;
1030                 *pval = val;
1031                 return 0;
1032
1033         case V4L2_CTRL_TYPE_BOOLEAN:
1034                 *pval = !!val;
1035                 return 0;
1036
1037         case V4L2_CTRL_TYPE_MENU:
1038                 if (val < ctrl->minimum || val > ctrl->maximum)
1039                         return -ERANGE;
1040                 if (ctrl->qmenu[val][0] == '\0' ||
1041                     (ctrl->menu_skip_mask & (1 << val)))
1042                         return -EINVAL;
1043                 return 0;
1044
1045         case V4L2_CTRL_TYPE_BITMASK:
1046                 *pval &= ctrl->maximum;
1047                 return 0;
1048
1049         case V4L2_CTRL_TYPE_BUTTON:
1050         case V4L2_CTRL_TYPE_CTRL_CLASS:
1051                 *pval = 0;
1052                 return 0;
1053
1054         default:
1055                 return -EINVAL;
1056         }
1057 }
1058
1059 /* Validate a new control */
1060 static int validate_new(const struct v4l2_ctrl *ctrl, struct v4l2_ext_control *c)
1061 {
1062         char *s = c->string;
1063         size_t len;
1064
1065         switch (ctrl->type) {
1066         case V4L2_CTRL_TYPE_INTEGER:
1067         case V4L2_CTRL_TYPE_BOOLEAN:
1068         case V4L2_CTRL_TYPE_MENU:
1069         case V4L2_CTRL_TYPE_BITMASK:
1070         case V4L2_CTRL_TYPE_BUTTON:
1071         case V4L2_CTRL_TYPE_CTRL_CLASS:
1072                 return validate_new_int(ctrl, &c->value);
1073
1074         case V4L2_CTRL_TYPE_INTEGER64:
1075                 return 0;
1076
1077         case V4L2_CTRL_TYPE_STRING:
1078                 len = strlen(s);
1079                 if (len < ctrl->minimum)
1080                         return -ERANGE;
1081                 if ((len - ctrl->minimum) % ctrl->step)
1082                         return -ERANGE;
1083                 return 0;
1084
1085         default:
1086                 return -EINVAL;
1087         }
1088 }
1089
1090 static inline u32 node2id(struct list_head *node)
1091 {
1092         return list_entry(node, struct v4l2_ctrl_ref, node)->ctrl->id;
1093 }
1094
1095 /* Set the handler's error code if it wasn't set earlier already */
1096 static inline int handler_set_err(struct v4l2_ctrl_handler *hdl, int err)
1097 {
1098         if (hdl->error == 0)
1099                 hdl->error = err;
1100         return err;
1101 }
1102
1103 /* Initialize the handler */
1104 int v4l2_ctrl_handler_init(struct v4l2_ctrl_handler *hdl,
1105                            unsigned nr_of_controls_hint)
1106 {
1107         mutex_init(&hdl->lock);
1108         INIT_LIST_HEAD(&hdl->ctrls);
1109         INIT_LIST_HEAD(&hdl->ctrl_refs);
1110         hdl->nr_of_buckets = 1 + nr_of_controls_hint / 8;
1111         hdl->buckets = kzalloc(sizeof(hdl->buckets[0]) * hdl->nr_of_buckets,
1112                                                                 GFP_KERNEL);
1113         hdl->error = hdl->buckets ? 0 : -ENOMEM;
1114         return hdl->error;
1115 }
1116 EXPORT_SYMBOL(v4l2_ctrl_handler_init);
1117
1118 /* Free all controls and control refs */
1119 void v4l2_ctrl_handler_free(struct v4l2_ctrl_handler *hdl)
1120 {
1121         struct v4l2_ctrl_ref *ref, *next_ref;
1122         struct v4l2_ctrl *ctrl, *next_ctrl;
1123         struct v4l2_subscribed_event *sev, *next_sev;
1124
1125         if (hdl == NULL || hdl->buckets == NULL)
1126                 return;
1127
1128         mutex_lock(&hdl->lock);
1129         /* Free all nodes */
1130         list_for_each_entry_safe(ref, next_ref, &hdl->ctrl_refs, node) {
1131                 list_del(&ref->node);
1132                 kfree(ref);
1133         }
1134         /* Free all controls owned by the handler */
1135         list_for_each_entry_safe(ctrl, next_ctrl, &hdl->ctrls, node) {
1136                 list_del(&ctrl->node);
1137                 list_for_each_entry_safe(sev, next_sev, &ctrl->ev_subs, node)
1138                         list_del(&sev->node);
1139                 kfree(ctrl);
1140         }
1141         kfree(hdl->buckets);
1142         hdl->buckets = NULL;
1143         hdl->cached = NULL;
1144         hdl->error = 0;
1145         mutex_unlock(&hdl->lock);
1146 }
1147 EXPORT_SYMBOL(v4l2_ctrl_handler_free);
1148
1149 /* For backwards compatibility: V4L2_CID_PRIVATE_BASE should no longer
1150    be used except in G_CTRL, S_CTRL, QUERYCTRL and QUERYMENU when dealing
1151    with applications that do not use the NEXT_CTRL flag.
1152
1153    We just find the n-th private user control. It's O(N), but that should not
1154    be an issue in this particular case. */
1155 static struct v4l2_ctrl_ref *find_private_ref(
1156                 struct v4l2_ctrl_handler *hdl, u32 id)
1157 {
1158         struct v4l2_ctrl_ref *ref;
1159
1160         id -= V4L2_CID_PRIVATE_BASE;
1161         list_for_each_entry(ref, &hdl->ctrl_refs, node) {
1162                 /* Search for private user controls that are compatible with
1163                    VIDIOC_G/S_CTRL. */
1164                 if (V4L2_CTRL_ID2CLASS(ref->ctrl->id) == V4L2_CTRL_CLASS_USER &&
1165                     V4L2_CTRL_DRIVER_PRIV(ref->ctrl->id)) {
1166                         if (!type_is_int(ref->ctrl))
1167                                 continue;
1168                         if (id == 0)
1169                                 return ref;
1170                         id--;
1171                 }
1172         }
1173         return NULL;
1174 }
1175
1176 /* Find a control with the given ID. */
1177 static struct v4l2_ctrl_ref *find_ref(struct v4l2_ctrl_handler *hdl, u32 id)
1178 {
1179         struct v4l2_ctrl_ref *ref;
1180         int bucket;
1181
1182         id &= V4L2_CTRL_ID_MASK;
1183
1184         /* Old-style private controls need special handling */
1185         if (id >= V4L2_CID_PRIVATE_BASE)
1186                 return find_private_ref(hdl, id);
1187         bucket = id % hdl->nr_of_buckets;
1188
1189         /* Simple optimization: cache the last control found */
1190         if (hdl->cached && hdl->cached->ctrl->id == id)
1191                 return hdl->cached;
1192
1193         /* Not in cache, search the hash */
1194         ref = hdl->buckets ? hdl->buckets[bucket] : NULL;
1195         while (ref && ref->ctrl->id != id)
1196                 ref = ref->next;
1197
1198         if (ref)
1199                 hdl->cached = ref; /* cache it! */
1200         return ref;
1201 }
1202
1203 /* Find a control with the given ID. Take the handler's lock first. */
1204 static struct v4l2_ctrl_ref *find_ref_lock(
1205                 struct v4l2_ctrl_handler *hdl, u32 id)
1206 {
1207         struct v4l2_ctrl_ref *ref = NULL;
1208
1209         if (hdl) {
1210                 mutex_lock(&hdl->lock);
1211                 ref = find_ref(hdl, id);
1212                 mutex_unlock(&hdl->lock);
1213         }
1214         return ref;
1215 }
1216
1217 /* Find a control with the given ID. */
1218 struct v4l2_ctrl *v4l2_ctrl_find(struct v4l2_ctrl_handler *hdl, u32 id)
1219 {
1220         struct v4l2_ctrl_ref *ref = find_ref_lock(hdl, id);
1221
1222         return ref ? ref->ctrl : NULL;
1223 }
1224 EXPORT_SYMBOL(v4l2_ctrl_find);
1225
1226 /* Allocate a new v4l2_ctrl_ref and hook it into the handler. */
1227 static int handler_new_ref(struct v4l2_ctrl_handler *hdl,
1228                            struct v4l2_ctrl *ctrl)
1229 {
1230         struct v4l2_ctrl_ref *ref;
1231         struct v4l2_ctrl_ref *new_ref;
1232         u32 id = ctrl->id;
1233         u32 class_ctrl = V4L2_CTRL_ID2CLASS(id) | 1;
1234         int bucket = id % hdl->nr_of_buckets;   /* which bucket to use */
1235
1236         /* Automatically add the control class if it is not yet present. */
1237         if (id != class_ctrl && find_ref_lock(hdl, class_ctrl) == NULL)
1238                 if (!v4l2_ctrl_new_std(hdl, NULL, class_ctrl, 0, 0, 0, 0))
1239                         return hdl->error;
1240
1241         if (hdl->error)
1242                 return hdl->error;
1243
1244         new_ref = kzalloc(sizeof(*new_ref), GFP_KERNEL);
1245         if (!new_ref)
1246                 return handler_set_err(hdl, -ENOMEM);
1247         new_ref->ctrl = ctrl;
1248         if (ctrl->handler == hdl) {
1249                 /* By default each control starts in a cluster of its own.
1250                    new_ref->ctrl is basically a cluster array with one
1251                    element, so that's perfect to use as the cluster pointer.
1252                    But only do this for the handler that owns the control. */
1253                 ctrl->cluster = &new_ref->ctrl;
1254                 ctrl->ncontrols = 1;
1255         }
1256
1257         INIT_LIST_HEAD(&new_ref->node);
1258
1259         mutex_lock(&hdl->lock);
1260
1261         /* Add immediately at the end of the list if the list is empty, or if
1262            the last element in the list has a lower ID.
1263            This ensures that when elements are added in ascending order the
1264            insertion is an O(1) operation. */
1265         if (list_empty(&hdl->ctrl_refs) || id > node2id(hdl->ctrl_refs.prev)) {
1266                 list_add_tail(&new_ref->node, &hdl->ctrl_refs);
1267                 goto insert_in_hash;
1268         }
1269
1270         /* Find insert position in sorted list */
1271         list_for_each_entry(ref, &hdl->ctrl_refs, node) {
1272                 if (ref->ctrl->id < id)
1273                         continue;
1274                 /* Don't add duplicates */
1275                 if (ref->ctrl->id == id) {
1276                         kfree(new_ref);
1277                         goto unlock;
1278                 }
1279                 list_add(&new_ref->node, ref->node.prev);
1280                 break;
1281         }
1282
1283 insert_in_hash:
1284         /* Insert the control node in the hash */
1285         new_ref->next = hdl->buckets[bucket];
1286         hdl->buckets[bucket] = new_ref;
1287
1288 unlock:
1289         mutex_unlock(&hdl->lock);
1290         return 0;
1291 }
1292
1293 /* Add a new control */
1294 static struct v4l2_ctrl *v4l2_ctrl_new(struct v4l2_ctrl_handler *hdl,
1295                         const struct v4l2_ctrl_ops *ops,
1296                         u32 id, const char *name, enum v4l2_ctrl_type type,
1297                         s32 min, s32 max, u32 step, s32 def,
1298                         u32 flags, const char * const *qmenu, void *priv)
1299 {
1300         struct v4l2_ctrl *ctrl;
1301         unsigned sz_extra = 0;
1302
1303         if (hdl->error)
1304                 return NULL;
1305
1306         /* Sanity checks */
1307         if (id == 0 || name == NULL || id >= V4L2_CID_PRIVATE_BASE ||
1308             (type == V4L2_CTRL_TYPE_INTEGER && step == 0) ||
1309             (type == V4L2_CTRL_TYPE_BITMASK && max == 0) ||
1310             (type == V4L2_CTRL_TYPE_MENU && qmenu == NULL) ||
1311             (type == V4L2_CTRL_TYPE_STRING && max == 0)) {
1312                 handler_set_err(hdl, -ERANGE);
1313                 return NULL;
1314         }
1315         if (type != V4L2_CTRL_TYPE_BITMASK && max < min) {
1316                 handler_set_err(hdl, -ERANGE);
1317                 return NULL;
1318         }
1319         if ((type == V4L2_CTRL_TYPE_INTEGER ||
1320              type == V4L2_CTRL_TYPE_MENU ||
1321              type == V4L2_CTRL_TYPE_BOOLEAN) &&
1322             (def < min || def > max)) {
1323                 handler_set_err(hdl, -ERANGE);
1324                 return NULL;
1325         }
1326         if (type == V4L2_CTRL_TYPE_BITMASK && ((def & ~max) || min || step)) {
1327                 handler_set_err(hdl, -ERANGE);
1328                 return NULL;
1329         }
1330
1331         if (type == V4L2_CTRL_TYPE_BUTTON)
1332                 flags |= V4L2_CTRL_FLAG_WRITE_ONLY;
1333         else if (type == V4L2_CTRL_TYPE_CTRL_CLASS)
1334                 flags |= V4L2_CTRL_FLAG_READ_ONLY;
1335         else if (type == V4L2_CTRL_TYPE_STRING)
1336                 sz_extra += 2 * (max + 1);
1337
1338         ctrl = kzalloc(sizeof(*ctrl) + sz_extra, GFP_KERNEL);
1339         if (ctrl == NULL) {
1340                 handler_set_err(hdl, -ENOMEM);
1341                 return NULL;
1342         }
1343
1344         INIT_LIST_HEAD(&ctrl->node);
1345         INIT_LIST_HEAD(&ctrl->ev_subs);
1346         ctrl->handler = hdl;
1347         ctrl->ops = ops;
1348         ctrl->id = id;
1349         ctrl->name = name;
1350         ctrl->type = type;
1351         ctrl->flags = flags;
1352         ctrl->minimum = min;
1353         ctrl->maximum = max;
1354         ctrl->step = step;
1355         ctrl->qmenu = qmenu;
1356         ctrl->priv = priv;
1357         ctrl->cur.val = ctrl->val = ctrl->default_value = def;
1358
1359         if (ctrl->type == V4L2_CTRL_TYPE_STRING) {
1360                 ctrl->cur.string = (char *)&ctrl[1] + sz_extra - (max + 1);
1361                 ctrl->string = (char *)&ctrl[1] + sz_extra - 2 * (max + 1);
1362                 if (ctrl->minimum)
1363                         memset(ctrl->cur.string, ' ', ctrl->minimum);
1364         }
1365         if (handler_new_ref(hdl, ctrl)) {
1366                 kfree(ctrl);
1367                 return NULL;
1368         }
1369         mutex_lock(&hdl->lock);
1370         list_add_tail(&ctrl->node, &hdl->ctrls);
1371         mutex_unlock(&hdl->lock);
1372         return ctrl;
1373 }
1374
1375 struct v4l2_ctrl *v4l2_ctrl_new_custom(struct v4l2_ctrl_handler *hdl,
1376                         const struct v4l2_ctrl_config *cfg, void *priv)
1377 {
1378         bool is_menu;
1379         struct v4l2_ctrl *ctrl;
1380         const char *name = cfg->name;
1381         const char * const *qmenu = cfg->qmenu;
1382         enum v4l2_ctrl_type type = cfg->type;
1383         u32 flags = cfg->flags;
1384         s32 min = cfg->min;
1385         s32 max = cfg->max;
1386         u32 step = cfg->step;
1387         s32 def = cfg->def;
1388
1389         if (name == NULL)
1390                 v4l2_ctrl_fill(cfg->id, &name, &type, &min, &max, &step,
1391                                                                 &def, &flags);
1392
1393         is_menu = (cfg->type == V4L2_CTRL_TYPE_MENU);
1394         if (is_menu)
1395                 WARN_ON(step);
1396         else
1397                 WARN_ON(cfg->menu_skip_mask);
1398         if (is_menu && qmenu == NULL)
1399                 qmenu = v4l2_ctrl_get_menu(cfg->id);
1400
1401         ctrl = v4l2_ctrl_new(hdl, cfg->ops, cfg->id, name,
1402                         type, min, max,
1403                         is_menu ? cfg->menu_skip_mask : step,
1404                         def, flags, qmenu, priv);
1405         if (ctrl)
1406                 ctrl->is_private = cfg->is_private;
1407         return ctrl;
1408 }
1409 EXPORT_SYMBOL(v4l2_ctrl_new_custom);
1410
1411 /* Helper function for standard non-menu controls */
1412 struct v4l2_ctrl *v4l2_ctrl_new_std(struct v4l2_ctrl_handler *hdl,
1413                         const struct v4l2_ctrl_ops *ops,
1414                         u32 id, s32 min, s32 max, u32 step, s32 def)
1415 {
1416         const char *name;
1417         enum v4l2_ctrl_type type;
1418         u32 flags;
1419
1420         v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
1421         if (type == V4L2_CTRL_TYPE_MENU) {
1422                 handler_set_err(hdl, -EINVAL);
1423                 return NULL;
1424         }
1425         return v4l2_ctrl_new(hdl, ops, id, name, type,
1426                                     min, max, step, def, flags, NULL, NULL);
1427 }
1428 EXPORT_SYMBOL(v4l2_ctrl_new_std);
1429
1430 /* Helper function for standard menu controls */
1431 struct v4l2_ctrl *v4l2_ctrl_new_std_menu(struct v4l2_ctrl_handler *hdl,
1432                         const struct v4l2_ctrl_ops *ops,
1433                         u32 id, s32 max, s32 mask, s32 def)
1434 {
1435         const char * const *qmenu = v4l2_ctrl_get_menu(id);
1436         const char *name;
1437         enum v4l2_ctrl_type type;
1438         s32 min;
1439         s32 step;
1440         u32 flags;
1441
1442         v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
1443         if (type != V4L2_CTRL_TYPE_MENU) {
1444                 handler_set_err(hdl, -EINVAL);
1445                 return NULL;
1446         }
1447         return v4l2_ctrl_new(hdl, ops, id, name, type,
1448                                     0, max, mask, def, flags, qmenu, NULL);
1449 }
1450 EXPORT_SYMBOL(v4l2_ctrl_new_std_menu);
1451
1452 /* Add a control from another handler to this handler */
1453 struct v4l2_ctrl *v4l2_ctrl_add_ctrl(struct v4l2_ctrl_handler *hdl,
1454                                           struct v4l2_ctrl *ctrl)
1455 {
1456         if (hdl == NULL || hdl->error)
1457                 return NULL;
1458         if (ctrl == NULL) {
1459                 handler_set_err(hdl, -EINVAL);
1460                 return NULL;
1461         }
1462         if (ctrl->handler == hdl)
1463                 return ctrl;
1464         return handler_new_ref(hdl, ctrl) ? NULL : ctrl;
1465 }
1466 EXPORT_SYMBOL(v4l2_ctrl_add_ctrl);
1467
1468 /* Add the controls from another handler to our own. */
1469 int v4l2_ctrl_add_handler(struct v4l2_ctrl_handler *hdl,
1470                           struct v4l2_ctrl_handler *add)
1471 {
1472         struct v4l2_ctrl *ctrl;
1473         int ret = 0;
1474
1475         /* Do nothing if either handler is NULL or if they are the same */
1476         if (!hdl || !add || hdl == add)
1477                 return 0;
1478         if (hdl->error)
1479                 return hdl->error;
1480         mutex_lock(&add->lock);
1481         list_for_each_entry(ctrl, &add->ctrls, node) {
1482                 /* Skip handler-private controls. */
1483                 if (ctrl->is_private)
1484                         continue;
1485                 /* And control classes */
1486                 if (ctrl->type == V4L2_CTRL_TYPE_CTRL_CLASS)
1487                         continue;
1488                 ret = handler_new_ref(hdl, ctrl);
1489                 if (ret)
1490                         break;
1491         }
1492         mutex_unlock(&add->lock);
1493         return ret;
1494 }
1495 EXPORT_SYMBOL(v4l2_ctrl_add_handler);
1496
1497 /* Cluster controls */
1498 void v4l2_ctrl_cluster(unsigned ncontrols, struct v4l2_ctrl **controls)
1499 {
1500         bool has_volatiles = false;
1501         int i;
1502
1503         /* The first control is the master control and it must not be NULL */
1504         BUG_ON(ncontrols == 0 || controls[0] == NULL);
1505
1506         for (i = 0; i < ncontrols; i++) {
1507                 if (controls[i]) {
1508                         controls[i]->cluster = controls;
1509                         controls[i]->ncontrols = ncontrols;
1510                         if (controls[i]->flags & V4L2_CTRL_FLAG_VOLATILE)
1511                                 has_volatiles = true;
1512                 }
1513         }
1514         controls[0]->has_volatiles = has_volatiles;
1515 }
1516 EXPORT_SYMBOL(v4l2_ctrl_cluster);
1517
1518 void v4l2_ctrl_auto_cluster(unsigned ncontrols, struct v4l2_ctrl **controls,
1519                             u8 manual_val, bool set_volatile)
1520 {
1521         struct v4l2_ctrl *master = controls[0];
1522         u32 flag = 0;
1523         int i;
1524
1525         v4l2_ctrl_cluster(ncontrols, controls);
1526         WARN_ON(ncontrols <= 1);
1527         WARN_ON(manual_val < master->minimum || manual_val > master->maximum);
1528         WARN_ON(set_volatile && !has_op(master, g_volatile_ctrl));
1529         master->is_auto = true;
1530         master->has_volatiles = set_volatile;
1531         master->manual_mode_value = manual_val;
1532         master->flags |= V4L2_CTRL_FLAG_UPDATE;
1533
1534         if (!is_cur_manual(master))
1535                 flag = V4L2_CTRL_FLAG_INACTIVE |
1536                         (set_volatile ? V4L2_CTRL_FLAG_VOLATILE : 0);
1537
1538         for (i = 1; i < ncontrols; i++)
1539                 if (controls[i])
1540                         controls[i]->flags |= flag;
1541 }
1542 EXPORT_SYMBOL(v4l2_ctrl_auto_cluster);
1543
1544 /* Activate/deactivate a control. */
1545 void v4l2_ctrl_activate(struct v4l2_ctrl *ctrl, bool active)
1546 {
1547         /* invert since the actual flag is called 'inactive' */
1548         bool inactive = !active;
1549         bool old;
1550
1551         if (ctrl == NULL)
1552                 return;
1553
1554         if (inactive)
1555                 /* set V4L2_CTRL_FLAG_INACTIVE */
1556                 old = test_and_set_bit(4, &ctrl->flags);
1557         else
1558                 /* clear V4L2_CTRL_FLAG_INACTIVE */
1559                 old = test_and_clear_bit(4, &ctrl->flags);
1560         if (old != inactive)
1561                 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_FLAGS);
1562 }
1563 EXPORT_SYMBOL(v4l2_ctrl_activate);
1564
1565 /* Grab/ungrab a control.
1566    Typically used when streaming starts and you want to grab controls,
1567    preventing the user from changing them.
1568
1569    Just call this and the framework will block any attempts to change
1570    these controls. */
1571 void v4l2_ctrl_grab(struct v4l2_ctrl *ctrl, bool grabbed)
1572 {
1573         bool old;
1574
1575         if (ctrl == NULL)
1576                 return;
1577
1578         v4l2_ctrl_lock(ctrl);
1579         if (grabbed)
1580                 /* set V4L2_CTRL_FLAG_GRABBED */
1581                 old = test_and_set_bit(1, &ctrl->flags);
1582         else
1583                 /* clear V4L2_CTRL_FLAG_GRABBED */
1584                 old = test_and_clear_bit(1, &ctrl->flags);
1585         if (old != grabbed)
1586                 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_FLAGS);
1587         v4l2_ctrl_unlock(ctrl);
1588 }
1589 EXPORT_SYMBOL(v4l2_ctrl_grab);
1590
1591 /* Log the control name and value */
1592 static void log_ctrl(const struct v4l2_ctrl *ctrl,
1593                      const char *prefix, const char *colon)
1594 {
1595         if (ctrl->flags & (V4L2_CTRL_FLAG_DISABLED | V4L2_CTRL_FLAG_WRITE_ONLY))
1596                 return;
1597         if (ctrl->type == V4L2_CTRL_TYPE_CTRL_CLASS)
1598                 return;
1599
1600         printk(KERN_INFO "%s%s%s: ", prefix, colon, ctrl->name);
1601
1602         switch (ctrl->type) {
1603         case V4L2_CTRL_TYPE_INTEGER:
1604                 printk(KERN_CONT "%d", ctrl->cur.val);
1605                 break;
1606         case V4L2_CTRL_TYPE_BOOLEAN:
1607                 printk(KERN_CONT "%s", ctrl->cur.val ? "true" : "false");
1608                 break;
1609         case V4L2_CTRL_TYPE_MENU:
1610                 printk(KERN_CONT "%s", ctrl->qmenu[ctrl->cur.val]);
1611                 break;
1612         case V4L2_CTRL_TYPE_BITMASK:
1613                 printk(KERN_CONT "0x%08x", ctrl->cur.val);
1614                 break;
1615         case V4L2_CTRL_TYPE_INTEGER64:
1616                 printk(KERN_CONT "%lld", ctrl->cur.val64);
1617                 break;
1618         case V4L2_CTRL_TYPE_STRING:
1619                 printk(KERN_CONT "%s", ctrl->cur.string);
1620                 break;
1621         default:
1622                 printk(KERN_CONT "unknown type %d", ctrl->type);
1623                 break;
1624         }
1625         if (ctrl->flags & (V4L2_CTRL_FLAG_INACTIVE |
1626                            V4L2_CTRL_FLAG_GRABBED |
1627                            V4L2_CTRL_FLAG_VOLATILE)) {
1628                 if (ctrl->flags & V4L2_CTRL_FLAG_INACTIVE)
1629                         printk(KERN_CONT " inactive");
1630                 if (ctrl->flags & V4L2_CTRL_FLAG_GRABBED)
1631                         printk(KERN_CONT " grabbed");
1632                 if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE)
1633                         printk(KERN_CONT " volatile");
1634         }
1635         printk(KERN_CONT "\n");
1636 }
1637
1638 /* Log all controls owned by the handler */
1639 void v4l2_ctrl_handler_log_status(struct v4l2_ctrl_handler *hdl,
1640                                   const char *prefix)
1641 {
1642         struct v4l2_ctrl *ctrl;
1643         const char *colon = "";
1644         int len;
1645
1646         if (hdl == NULL)
1647                 return;
1648         if (prefix == NULL)
1649                 prefix = "";
1650         len = strlen(prefix);
1651         if (len && prefix[len - 1] != ' ')
1652                 colon = ": ";
1653         mutex_lock(&hdl->lock);
1654         list_for_each_entry(ctrl, &hdl->ctrls, node)
1655                 if (!(ctrl->flags & V4L2_CTRL_FLAG_DISABLED))
1656                         log_ctrl(ctrl, prefix, colon);
1657         mutex_unlock(&hdl->lock);
1658 }
1659 EXPORT_SYMBOL(v4l2_ctrl_handler_log_status);
1660
1661 /* Call s_ctrl for all controls owned by the handler */
1662 int v4l2_ctrl_handler_setup(struct v4l2_ctrl_handler *hdl)
1663 {
1664         struct v4l2_ctrl *ctrl;
1665         int ret = 0;
1666
1667         if (hdl == NULL)
1668                 return 0;
1669         mutex_lock(&hdl->lock);
1670         list_for_each_entry(ctrl, &hdl->ctrls, node)
1671                 ctrl->done = false;
1672
1673         list_for_each_entry(ctrl, &hdl->ctrls, node) {
1674                 struct v4l2_ctrl *master = ctrl->cluster[0];
1675                 int i;
1676
1677                 /* Skip if this control was already handled by a cluster. */
1678                 /* Skip button controls and read-only controls. */
1679                 if (ctrl->done || ctrl->type == V4L2_CTRL_TYPE_BUTTON ||
1680                     (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY))
1681                         continue;
1682
1683                 for (i = 0; i < master->ncontrols; i++) {
1684                         if (master->cluster[i]) {
1685                                 cur_to_new(master->cluster[i]);
1686                                 master->cluster[i]->is_new = 1;
1687                                 master->cluster[i]->done = true;
1688                         }
1689                 }
1690                 ret = call_op(master, s_ctrl);
1691                 if (ret)
1692                         break;
1693         }
1694         mutex_unlock(&hdl->lock);
1695         return ret;
1696 }
1697 EXPORT_SYMBOL(v4l2_ctrl_handler_setup);
1698
1699 /* Implement VIDIOC_QUERYCTRL */
1700 int v4l2_queryctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_queryctrl *qc)
1701 {
1702         u32 id = qc->id & V4L2_CTRL_ID_MASK;
1703         struct v4l2_ctrl_ref *ref;
1704         struct v4l2_ctrl *ctrl;
1705
1706         if (hdl == NULL)
1707                 return -EINVAL;
1708
1709         mutex_lock(&hdl->lock);
1710
1711         /* Try to find it */
1712         ref = find_ref(hdl, id);
1713
1714         if ((qc->id & V4L2_CTRL_FLAG_NEXT_CTRL) && !list_empty(&hdl->ctrl_refs)) {
1715                 /* Find the next control with ID > qc->id */
1716
1717                 /* Did we reach the end of the control list? */
1718                 if (id >= node2id(hdl->ctrl_refs.prev)) {
1719                         ref = NULL; /* Yes, so there is no next control */
1720                 } else if (ref) {
1721                         /* We found a control with the given ID, so just get
1722                            the next one in the list. */
1723                         ref = list_entry(ref->node.next, typeof(*ref), node);
1724                 } else {
1725                         /* No control with the given ID exists, so start
1726                            searching for the next largest ID. We know there
1727                            is one, otherwise the first 'if' above would have
1728                            been true. */
1729                         list_for_each_entry(ref, &hdl->ctrl_refs, node)
1730                                 if (id < ref->ctrl->id)
1731                                         break;
1732                 }
1733         }
1734         mutex_unlock(&hdl->lock);
1735         if (!ref)
1736                 return -EINVAL;
1737
1738         ctrl = ref->ctrl;
1739         memset(qc, 0, sizeof(*qc));
1740         if (id >= V4L2_CID_PRIVATE_BASE)
1741                 qc->id = id;
1742         else
1743                 qc->id = ctrl->id;
1744         strlcpy(qc->name, ctrl->name, sizeof(qc->name));
1745         qc->minimum = ctrl->minimum;
1746         qc->maximum = ctrl->maximum;
1747         qc->default_value = ctrl->default_value;
1748         if (ctrl->type == V4L2_CTRL_TYPE_MENU)
1749                 qc->step = 1;
1750         else
1751                 qc->step = ctrl->step;
1752         qc->flags = ctrl->flags;
1753         qc->type = ctrl->type;
1754         return 0;
1755 }
1756 EXPORT_SYMBOL(v4l2_queryctrl);
1757
1758 int v4l2_subdev_queryctrl(struct v4l2_subdev *sd, struct v4l2_queryctrl *qc)
1759 {
1760         if (qc->id & V4L2_CTRL_FLAG_NEXT_CTRL)
1761                 return -EINVAL;
1762         return v4l2_queryctrl(sd->ctrl_handler, qc);
1763 }
1764 EXPORT_SYMBOL(v4l2_subdev_queryctrl);
1765
1766 /* Implement VIDIOC_QUERYMENU */
1767 int v4l2_querymenu(struct v4l2_ctrl_handler *hdl, struct v4l2_querymenu *qm)
1768 {
1769         struct v4l2_ctrl *ctrl;
1770         u32 i = qm->index;
1771
1772         ctrl = v4l2_ctrl_find(hdl, qm->id);
1773         if (!ctrl)
1774                 return -EINVAL;
1775
1776         qm->reserved = 0;
1777         /* Sanity checks */
1778         if (ctrl->qmenu == NULL ||
1779             i < ctrl->minimum || i > ctrl->maximum)
1780                 return -EINVAL;
1781         /* Use mask to see if this menu item should be skipped */
1782         if (ctrl->menu_skip_mask & (1 << i))
1783                 return -EINVAL;
1784         /* Empty menu items should also be skipped */
1785         if (ctrl->qmenu[i] == NULL || ctrl->qmenu[i][0] == '\0')
1786                 return -EINVAL;
1787         strlcpy(qm->name, ctrl->qmenu[i], sizeof(qm->name));
1788         return 0;
1789 }
1790 EXPORT_SYMBOL(v4l2_querymenu);
1791
1792 int v4l2_subdev_querymenu(struct v4l2_subdev *sd, struct v4l2_querymenu *qm)
1793 {
1794         return v4l2_querymenu(sd->ctrl_handler, qm);
1795 }
1796 EXPORT_SYMBOL(v4l2_subdev_querymenu);
1797
1798
1799
1800 /* Some general notes on the atomic requirements of VIDIOC_G/TRY/S_EXT_CTRLS:
1801
1802    It is not a fully atomic operation, just best-effort only. After all, if
1803    multiple controls have to be set through multiple i2c writes (for example)
1804    then some initial writes may succeed while others fail. Thus leaving the
1805    system in an inconsistent state. The question is how much effort you are
1806    willing to spend on trying to make something atomic that really isn't.
1807
1808    From the point of view of an application the main requirement is that
1809    when you call VIDIOC_S_EXT_CTRLS and some values are invalid then an
1810    error should be returned without actually affecting any controls.
1811
1812    If all the values are correct, then it is acceptable to just give up
1813    in case of low-level errors.
1814
1815    It is important though that the application can tell when only a partial
1816    configuration was done. The way we do that is through the error_idx field
1817    of struct v4l2_ext_controls: if that is equal to the count field then no
1818    controls were affected. Otherwise all controls before that index were
1819    successful in performing their 'get' or 'set' operation, the control at
1820    the given index failed, and you don't know what happened with the controls
1821    after the failed one. Since if they were part of a control cluster they
1822    could have been successfully processed (if a cluster member was encountered
1823    at index < error_idx), they could have failed (if a cluster member was at
1824    error_idx), or they may not have been processed yet (if the first cluster
1825    member appeared after error_idx).
1826
1827    It is all fairly theoretical, though. In practice all you can do is to
1828    bail out. If error_idx == count, then it is an application bug. If
1829    error_idx < count then it is only an application bug if the error code was
1830    EBUSY. That usually means that something started streaming just when you
1831    tried to set the controls. In all other cases it is a driver/hardware
1832    problem and all you can do is to retry or bail out.
1833
1834    Note that these rules do not apply to VIDIOC_TRY_EXT_CTRLS: since that
1835    never modifies controls the error_idx is just set to whatever control
1836    has an invalid value.
1837  */
1838
1839 /* Prepare for the extended g/s/try functions.
1840    Find the controls in the control array and do some basic checks. */
1841 static int prepare_ext_ctrls(struct v4l2_ctrl_handler *hdl,
1842                              struct v4l2_ext_controls *cs,
1843                              struct v4l2_ctrl_helper *helpers)
1844 {
1845         struct v4l2_ctrl_helper *h;
1846         bool have_clusters = false;
1847         u32 i;
1848
1849         for (i = 0, h = helpers; i < cs->count; i++, h++) {
1850                 struct v4l2_ext_control *c = &cs->controls[i];
1851                 struct v4l2_ctrl_ref *ref;
1852                 struct v4l2_ctrl *ctrl;
1853                 u32 id = c->id & V4L2_CTRL_ID_MASK;
1854
1855                 cs->error_idx = i;
1856
1857                 if (cs->ctrl_class && V4L2_CTRL_ID2CLASS(id) != cs->ctrl_class)
1858                         return -EINVAL;
1859
1860                 /* Old-style private controls are not allowed for
1861                    extended controls */
1862                 if (id >= V4L2_CID_PRIVATE_BASE)
1863                         return -EINVAL;
1864                 ref = find_ref_lock(hdl, id);
1865                 if (ref == NULL)
1866                         return -EINVAL;
1867                 ctrl = ref->ctrl;
1868                 if (ctrl->flags & V4L2_CTRL_FLAG_DISABLED)
1869                         return -EINVAL;
1870
1871                 if (ctrl->cluster[0]->ncontrols > 1)
1872                         have_clusters = true;
1873                 if (ctrl->cluster[0] != ctrl)
1874                         ref = find_ref_lock(hdl, ctrl->cluster[0]->id);
1875                 /* Store the ref to the master control of the cluster */
1876                 h->mref = ref;
1877                 h->ctrl = ctrl;
1878                 /* Initially set next to 0, meaning that there is no other
1879                    control in this helper array belonging to the same
1880                    cluster */
1881                 h->next = 0;
1882         }
1883
1884         /* We are done if there were no controls that belong to a multi-
1885            control cluster. */
1886         if (!have_clusters)
1887                 return 0;
1888
1889         /* The code below figures out in O(n) time which controls in the list
1890            belong to the same cluster. */
1891
1892         /* This has to be done with the handler lock taken. */
1893         mutex_lock(&hdl->lock);
1894
1895         /* First zero the helper field in the master control references */
1896         for (i = 0; i < cs->count; i++)
1897                 helpers[i].mref->helper = 0;
1898         for (i = 0, h = helpers; i < cs->count; i++, h++) {
1899                 struct v4l2_ctrl_ref *mref = h->mref;
1900
1901                 /* If the mref->helper is set, then it points to an earlier
1902                    helper that belongs to the same cluster. */
1903                 if (mref->helper) {
1904                         /* Set the next field of mref->helper to the current
1905                            index: this means that that earlier helper now
1906                            points to the next helper in the same cluster. */
1907                         mref->helper->next = i;
1908                         /* mref should be set only for the first helper in the
1909                            cluster, clear the others. */
1910                         h->mref = NULL;
1911                 }
1912                 /* Point the mref helper to the current helper struct. */
1913                 mref->helper = h;
1914         }
1915         mutex_unlock(&hdl->lock);
1916         return 0;
1917 }
1918
1919 /* Handles the corner case where cs->count == 0. It checks whether the
1920    specified control class exists. If that class ID is 0, then it checks
1921    whether there are any controls at all. */
1922 static int class_check(struct v4l2_ctrl_handler *hdl, u32 ctrl_class)
1923 {
1924         if (ctrl_class == 0)
1925                 return list_empty(&hdl->ctrl_refs) ? -EINVAL : 0;
1926         return find_ref_lock(hdl, ctrl_class | 1) ? 0 : -EINVAL;
1927 }
1928
1929
1930
1931 /* Get extended controls. Allocates the helpers array if needed. */
1932 int v4l2_g_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *cs)
1933 {
1934         struct v4l2_ctrl_helper helper[4];
1935         struct v4l2_ctrl_helper *helpers = helper;
1936         int ret;
1937         int i, j;
1938
1939         cs->error_idx = cs->count;
1940         cs->ctrl_class = V4L2_CTRL_ID2CLASS(cs->ctrl_class);
1941
1942         if (hdl == NULL)
1943                 return -EINVAL;
1944
1945         if (cs->count == 0)
1946                 return class_check(hdl, cs->ctrl_class);
1947
1948         if (cs->count > ARRAY_SIZE(helper)) {
1949                 helpers = kmalloc(sizeof(helper[0]) * cs->count, GFP_KERNEL);
1950                 if (helpers == NULL)
1951                         return -ENOMEM;
1952         }
1953
1954         ret = prepare_ext_ctrls(hdl, cs, helpers);
1955         cs->error_idx = cs->count;
1956
1957         for (i = 0; !ret && i < cs->count; i++)
1958                 if (helpers[i].ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY)
1959                         ret = -EACCES;
1960
1961         for (i = 0; !ret && i < cs->count; i++) {
1962                 int (*ctrl_to_user)(struct v4l2_ext_control *c,
1963                                     struct v4l2_ctrl *ctrl) = cur_to_user;
1964                 struct v4l2_ctrl *master;
1965
1966                 if (helpers[i].mref == NULL)
1967                         continue;
1968
1969                 master = helpers[i].mref->ctrl;
1970                 cs->error_idx = i;
1971
1972                 v4l2_ctrl_lock(master);
1973
1974                 /* g_volatile_ctrl will update the new control values */
1975                 if ((master->flags & V4L2_CTRL_FLAG_VOLATILE) ||
1976                         (master->has_volatiles && !is_cur_manual(master))) {
1977                         for (j = 0; j < master->ncontrols; j++)
1978                                 cur_to_new(master->cluster[j]);
1979                         ret = call_op(master, g_volatile_ctrl);
1980                         ctrl_to_user = new_to_user;
1981                 }
1982                 /* If OK, then copy the current (for non-volatile controls)
1983                    or the new (for volatile controls) control values to the
1984                    caller */
1985                 if (!ret) {
1986                         u32 idx = i;
1987
1988                         do {
1989                                 ret = ctrl_to_user(cs->controls + idx,
1990                                                    helpers[idx].ctrl);
1991                                 idx = helpers[idx].next;
1992                         } while (!ret && idx);
1993                 }
1994                 v4l2_ctrl_unlock(master);
1995         }
1996
1997         if (cs->count > ARRAY_SIZE(helper))
1998                 kfree(helpers);
1999         return ret;
2000 }
2001 EXPORT_SYMBOL(v4l2_g_ext_ctrls);
2002
2003 int v4l2_subdev_g_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs)
2004 {
2005         return v4l2_g_ext_ctrls(sd->ctrl_handler, cs);
2006 }
2007 EXPORT_SYMBOL(v4l2_subdev_g_ext_ctrls);
2008
2009 /* Helper function to get a single control */
2010 static int get_ctrl(struct v4l2_ctrl *ctrl, s32 *val)
2011 {
2012         struct v4l2_ctrl *master = ctrl->cluster[0];
2013         int ret = 0;
2014         int i;
2015
2016         if (ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY)
2017                 return -EACCES;
2018
2019         v4l2_ctrl_lock(master);
2020         /* g_volatile_ctrl will update the current control values */
2021         if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE) {
2022                 for (i = 0; i < master->ncontrols; i++)
2023                         cur_to_new(master->cluster[i]);
2024                 ret = call_op(master, g_volatile_ctrl);
2025                 *val = ctrl->val;
2026         } else {
2027                 *val = ctrl->cur.val;
2028         }
2029         v4l2_ctrl_unlock(master);
2030         return ret;
2031 }
2032
2033 int v4l2_g_ctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_control *control)
2034 {
2035         struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, control->id);
2036
2037         if (ctrl == NULL || !type_is_int(ctrl))
2038                 return -EINVAL;
2039         return get_ctrl(ctrl, &control->value);
2040 }
2041 EXPORT_SYMBOL(v4l2_g_ctrl);
2042
2043 int v4l2_subdev_g_ctrl(struct v4l2_subdev *sd, struct v4l2_control *control)
2044 {
2045         return v4l2_g_ctrl(sd->ctrl_handler, control);
2046 }
2047 EXPORT_SYMBOL(v4l2_subdev_g_ctrl);
2048
2049 s32 v4l2_ctrl_g_ctrl(struct v4l2_ctrl *ctrl)
2050 {
2051         s32 val = 0;
2052
2053         /* It's a driver bug if this happens. */
2054         WARN_ON(!type_is_int(ctrl));
2055         get_ctrl(ctrl, &val);
2056         return val;
2057 }
2058 EXPORT_SYMBOL(v4l2_ctrl_g_ctrl);
2059
2060
2061 /* Core function that calls try/s_ctrl and ensures that the new value is
2062    copied to the current value on a set.
2063    Must be called with ctrl->handler->lock held. */
2064 static int try_or_set_cluster(struct v4l2_fh *fh,
2065                               struct v4l2_ctrl *master, bool set)
2066 {
2067         bool update_flag;
2068         int ret;
2069         int i;
2070
2071         /* Go through the cluster and either validate the new value or
2072            (if no new value was set), copy the current value to the new
2073            value, ensuring a consistent view for the control ops when
2074            called. */
2075         for (i = 0; i < master->ncontrols; i++) {
2076                 struct v4l2_ctrl *ctrl = master->cluster[i];
2077
2078                 if (ctrl == NULL)
2079                         continue;
2080
2081                 if (!ctrl->is_new) {
2082                         cur_to_new(ctrl);
2083                         continue;
2084                 }
2085                 /* Check again: it may have changed since the
2086                    previous check in try_or_set_ext_ctrls(). */
2087                 if (set && (ctrl->flags & V4L2_CTRL_FLAG_GRABBED))
2088                         return -EBUSY;
2089         }
2090
2091         ret = call_op(master, try_ctrl);
2092
2093         /* Don't set if there is no change */
2094         if (ret || !set || !cluster_changed(master))
2095                 return ret;
2096         ret = call_op(master, s_ctrl);
2097         if (ret)
2098                 return ret;
2099
2100         /* If OK, then make the new values permanent. */
2101         update_flag = is_cur_manual(master) != is_new_manual(master);
2102         for (i = 0; i < master->ncontrols; i++)
2103                 new_to_cur(fh, master->cluster[i], update_flag && i > 0);
2104         return 0;
2105 }
2106
2107 /* Validate controls. */
2108 static int validate_ctrls(struct v4l2_ext_controls *cs,
2109                           struct v4l2_ctrl_helper *helpers, bool set)
2110 {
2111         unsigned i;
2112         int ret = 0;
2113
2114         cs->error_idx = cs->count;
2115         for (i = 0; i < cs->count; i++) {
2116                 struct v4l2_ctrl *ctrl = helpers[i].ctrl;
2117
2118                 cs->error_idx = i;
2119
2120                 if (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY)
2121                         return -EACCES;
2122                 /* This test is also done in try_set_control_cluster() which
2123                    is called in atomic context, so that has the final say,
2124                    but it makes sense to do an up-front check as well. Once
2125                    an error occurs in try_set_control_cluster() some other
2126                    controls may have been set already and we want to do a
2127                    best-effort to avoid that. */
2128                 if (set && (ctrl->flags & V4L2_CTRL_FLAG_GRABBED))
2129                         return -EBUSY;
2130                 ret = validate_new(ctrl, &cs->controls[i]);
2131                 if (ret)
2132                         return ret;
2133         }
2134         return 0;
2135 }
2136
2137 /* Obtain the current volatile values of an autocluster and mark them
2138    as new. */
2139 static void update_from_auto_cluster(struct v4l2_ctrl *master)
2140 {
2141         int i;
2142
2143         for (i = 0; i < master->ncontrols; i++)
2144                 cur_to_new(master->cluster[i]);
2145         if (!call_op(master, g_volatile_ctrl))
2146                 for (i = 1; i < master->ncontrols; i++)
2147                         if (master->cluster[i])
2148                                 master->cluster[i]->is_new = 1;
2149 }
2150
2151 /* Try or try-and-set controls */
2152 static int try_set_ext_ctrls(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
2153                              struct v4l2_ext_controls *cs,
2154                              bool set)
2155 {
2156         struct v4l2_ctrl_helper helper[4];
2157         struct v4l2_ctrl_helper *helpers = helper;
2158         unsigned i, j;
2159         int ret;
2160
2161         cs->error_idx = cs->count;
2162         cs->ctrl_class = V4L2_CTRL_ID2CLASS(cs->ctrl_class);
2163
2164         if (hdl == NULL)
2165                 return -EINVAL;
2166
2167         if (cs->count == 0)
2168                 return class_check(hdl, cs->ctrl_class);
2169
2170         if (cs->count > ARRAY_SIZE(helper)) {
2171                 helpers = kmalloc(sizeof(helper[0]) * cs->count, GFP_KERNEL);
2172                 if (!helpers)
2173                         return -ENOMEM;
2174         }
2175         ret = prepare_ext_ctrls(hdl, cs, helpers);
2176         if (!ret)
2177                 ret = validate_ctrls(cs, helpers, set);
2178         if (ret && set)
2179                 cs->error_idx = cs->count;
2180         for (i = 0; !ret && i < cs->count; i++) {
2181                 struct v4l2_ctrl *master;
2182                 u32 idx = i;
2183
2184                 if (helpers[i].mref == NULL)
2185                         continue;
2186
2187                 cs->error_idx = i;
2188                 master = helpers[i].mref->ctrl;
2189                 v4l2_ctrl_lock(master);
2190
2191                 /* Reset the 'is_new' flags of the cluster */
2192                 for (j = 0; j < master->ncontrols; j++)
2193                         if (master->cluster[j])
2194                                 master->cluster[j]->is_new = 0;
2195
2196                 /* For volatile autoclusters that are currently in auto mode
2197                    we need to discover if it will be set to manual mode.
2198                    If so, then we have to copy the current volatile values
2199                    first since those will become the new manual values (which
2200                    may be overwritten by explicit new values from this set
2201                    of controls). */
2202                 if (master->is_auto && master->has_volatiles &&
2203                                                 !is_cur_manual(master)) {
2204                         /* Pick an initial non-manual value */
2205                         s32 new_auto_val = master->manual_mode_value + 1;
2206                         u32 tmp_idx = idx;
2207
2208                         do {
2209                                 /* Check if the auto control is part of the
2210                                    list, and remember the new value. */
2211                                 if (helpers[tmp_idx].ctrl == master)
2212                                         new_auto_val = cs->controls[tmp_idx].value;
2213                                 tmp_idx = helpers[tmp_idx].next;
2214                         } while (tmp_idx);
2215                         /* If the new value == the manual value, then copy
2216                            the current volatile values. */
2217                         if (new_auto_val == master->manual_mode_value)
2218                                 update_from_auto_cluster(master);
2219                 }
2220
2221                 /* Copy the new caller-supplied control values.
2222                    user_to_new() sets 'is_new' to 1. */
2223                 do {
2224                         ret = user_to_new(cs->controls + idx, helpers[idx].ctrl);
2225                         idx = helpers[idx].next;
2226                 } while (!ret && idx);
2227
2228                 if (!ret)
2229                         ret = try_or_set_cluster(fh, master, set);
2230
2231                 /* Copy the new values back to userspace. */
2232                 if (!ret) {
2233                         idx = i;
2234                         do {
2235                                 ret = new_to_user(cs->controls + idx,
2236                                                 helpers[idx].ctrl);
2237                                 idx = helpers[idx].next;
2238                         } while (!ret && idx);
2239                 }
2240                 v4l2_ctrl_unlock(master);
2241         }
2242
2243         if (cs->count > ARRAY_SIZE(helper))
2244                 kfree(helpers);
2245         return ret;
2246 }
2247
2248 int v4l2_try_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *cs)
2249 {
2250         return try_set_ext_ctrls(NULL, hdl, cs, false);
2251 }
2252 EXPORT_SYMBOL(v4l2_try_ext_ctrls);
2253
2254 int v4l2_s_ext_ctrls(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
2255                                         struct v4l2_ext_controls *cs)
2256 {
2257         return try_set_ext_ctrls(fh, hdl, cs, true);
2258 }
2259 EXPORT_SYMBOL(v4l2_s_ext_ctrls);
2260
2261 int v4l2_subdev_try_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs)
2262 {
2263         return try_set_ext_ctrls(NULL, sd->ctrl_handler, cs, false);
2264 }
2265 EXPORT_SYMBOL(v4l2_subdev_try_ext_ctrls);
2266
2267 int v4l2_subdev_s_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs)
2268 {
2269         return try_set_ext_ctrls(NULL, sd->ctrl_handler, cs, true);
2270 }
2271 EXPORT_SYMBOL(v4l2_subdev_s_ext_ctrls);
2272
2273 /* Helper function for VIDIOC_S_CTRL compatibility */
2274 static int set_ctrl(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, s32 *val)
2275 {
2276         struct v4l2_ctrl *master = ctrl->cluster[0];
2277         int ret;
2278         int i;
2279
2280         ret = validate_new_int(ctrl, val);
2281         if (ret)
2282                 return ret;
2283
2284         v4l2_ctrl_lock(ctrl);
2285
2286         /* Reset the 'is_new' flags of the cluster */
2287         for (i = 0; i < master->ncontrols; i++)
2288                 if (master->cluster[i])
2289                         master->cluster[i]->is_new = 0;
2290
2291         /* For autoclusters with volatiles that are switched from auto to
2292            manual mode we have to update the current volatile values since
2293            those will become the initial manual values after such a switch. */
2294         if (master->is_auto && master->has_volatiles && ctrl == master &&
2295             !is_cur_manual(master) && *val == master->manual_mode_value)
2296                 update_from_auto_cluster(master);
2297         ctrl->val = *val;
2298         ctrl->is_new = 1;
2299         ret = try_or_set_cluster(fh, master, true);
2300         *val = ctrl->cur.val;
2301         v4l2_ctrl_unlock(ctrl);
2302         return ret;
2303 }
2304
2305 int v4l2_s_ctrl(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
2306                                         struct v4l2_control *control)
2307 {
2308         struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, control->id);
2309
2310         if (ctrl == NULL || !type_is_int(ctrl))
2311                 return -EINVAL;
2312
2313         if (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY)
2314                 return -EACCES;
2315
2316         return set_ctrl(fh, ctrl, &control->value);
2317 }
2318 EXPORT_SYMBOL(v4l2_s_ctrl);
2319
2320 int v4l2_subdev_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *control)
2321 {
2322         return v4l2_s_ctrl(NULL, sd->ctrl_handler, control);
2323 }
2324 EXPORT_SYMBOL(v4l2_subdev_s_ctrl);
2325
2326 int v4l2_ctrl_s_ctrl(struct v4l2_ctrl *ctrl, s32 val)
2327 {
2328         /* It's a driver bug if this happens. */
2329         WARN_ON(!type_is_int(ctrl));
2330         return set_ctrl(NULL, ctrl, &val);
2331 }
2332 EXPORT_SYMBOL(v4l2_ctrl_s_ctrl);
2333
2334 void v4l2_ctrl_add_event(struct v4l2_ctrl *ctrl,
2335                                 struct v4l2_subscribed_event *sev)
2336 {
2337         v4l2_ctrl_lock(ctrl);
2338         list_add_tail(&sev->node, &ctrl->ev_subs);
2339         if (ctrl->type != V4L2_CTRL_TYPE_CTRL_CLASS &&
2340             (sev->flags & V4L2_EVENT_SUB_FL_SEND_INITIAL)) {
2341                 struct v4l2_event ev;
2342                 u32 changes = V4L2_EVENT_CTRL_CH_FLAGS;
2343
2344                 if (!(ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY))
2345                         changes |= V4L2_EVENT_CTRL_CH_VALUE;
2346                 fill_event(&ev, ctrl, changes);
2347                 v4l2_event_queue_fh(sev->fh, &ev);
2348         }
2349         v4l2_ctrl_unlock(ctrl);
2350 }
2351 EXPORT_SYMBOL(v4l2_ctrl_add_event);
2352
2353 void v4l2_ctrl_del_event(struct v4l2_ctrl *ctrl,
2354                                 struct v4l2_subscribed_event *sev)
2355 {
2356         v4l2_ctrl_lock(ctrl);
2357         list_del(&sev->node);
2358         v4l2_ctrl_unlock(ctrl);
2359 }
2360 EXPORT_SYMBOL(v4l2_ctrl_del_event);