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 && (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         }
 951         if (changed || update_inactive) {
 952                 /* If a control was changed that was not one of the controls
 953                    modified by the application, then send the event to all. */
 954                 if (!ctrl->is_new)
 955                         fh = NULL;
 956                 send_event(fh, ctrl,
 957                         (changed ? V4L2_EVENT_CTRL_CH_VALUE : 0) |
 958                         (update_inactive ? V4L2_EVENT_CTRL_CH_FLAGS : 0));
 959         }
 960 }
 961
 962 /* Copy the current value to the new value */
 963 static void cur_to_new(struct v4l2_ctrl *ctrl)
 964 {
 965         if (ctrl == NULL)
 966                 return;
 967         switch (ctrl->type) {
 968         case V4L2_CTRL_TYPE_STRING:
 969                 /* strings are always 0-terminated */
 970                 strcpy(ctrl->string, ctrl->cur.string);
 971                 break;
 972         case V4L2_CTRL_TYPE_INTEGER64:
 973                 ctrl->val64 = ctrl->cur.val64;
 974                 break;
 975         default:
 976                 ctrl->val = ctrl->cur.val;
 977                 break;
 978         }
 979 }
 980
 981 /* Return non-zero if one or more of the controls in the cluster has a new
 982    value that differs from the current value. */
 983 static int cluster_changed(struct v4l2_ctrl *master)
 984 {
 985         int diff = 0;
 986         int i;
 987
 988         for (i = 0; !diff && i < master->ncontrols; i++) {
 989                 struct v4l2_ctrl *ctrl = master->cluster[i];
 990
 991                 if (ctrl == NULL)
 992                         continue;
 993                 switch (ctrl->type) {
 994                 case V4L2_CTRL_TYPE_BUTTON:
 995                         /* Button controls are always 'different' */
 996                         return 1;
 997                 case V4L2_CTRL_TYPE_STRING:
 998                         /* strings are always 0-terminated */
 999                         diff = strcmp(ctrl->string, ctrl->cur.string);
1000                         break;
1001                 case V4L2_CTRL_TYPE_INTEGER64:
1002                         diff = ctrl->val64 != ctrl->cur.val64;
1003                         break;
1004                 default:
1005                         diff = ctrl->val != ctrl->cur.val;
1006                         break;
1007                 }
1008         }
1009         return diff;
1010 }
1011
1012 /* Validate integer-type control */
1013 static int validate_new_int(const struct v4l2_ctrl *ctrl, s32 *pval)
1014 {
1015         s32 val = *pval;
1016         u32 offset;
1017
1018         switch (ctrl->type) {
1019         case V4L2_CTRL_TYPE_INTEGER:
1020                 /* Round towards the closest legal value */
1021                 val += ctrl->step / 2;
1022                 if (val < ctrl->minimum)
1023                         val = ctrl->minimum;
1024                 if (val > ctrl->maximum)
1025                         val = ctrl->maximum;
1026                 offset = val - ctrl->minimum;
1027                 offset = ctrl->step * (offset / ctrl->step);
1028                 val = ctrl->minimum + offset;
1029                 *pval = val;
1030                 return 0;
1031
1032         case V4L2_CTRL_TYPE_BOOLEAN:
1033                 *pval = !!val;
1034                 return 0;
1035
1036         case V4L2_CTRL_TYPE_MENU:
1037                 if (val < ctrl->minimum || val > ctrl->maximum)
1038                         return -ERANGE;
1039                 if (ctrl->qmenu[val][0] == '\0' ||
1040                     (ctrl->menu_skip_mask & (1 << val)))
1041                         return -EINVAL;
1042                 return 0;
1043
1044         case V4L2_CTRL_TYPE_BITMASK:
1045                 *pval &= ctrl->maximum;
1046                 return 0;
1047
1048         case V4L2_CTRL_TYPE_BUTTON:
1049         case V4L2_CTRL_TYPE_CTRL_CLASS:
1050                 *pval = 0;
1051                 return 0;
1052
1053         default:
1054                 return -EINVAL;
1055         }
1056 }
1057
1058 /* Validate a new control */
1059 static int validate_new(const struct v4l2_ctrl *ctrl, struct v4l2_ext_control *c)
1060 {
1061         char *s = c->string;
1062         size_t len;
1063
1064         switch (ctrl->type) {
1065         case V4L2_CTRL_TYPE_INTEGER:
1066         case V4L2_CTRL_TYPE_BOOLEAN:
1067         case V4L2_CTRL_TYPE_MENU:
1068         case V4L2_CTRL_TYPE_BITMASK:
1069         case V4L2_CTRL_TYPE_BUTTON:
1070         case V4L2_CTRL_TYPE_CTRL_CLASS:
1071                 return validate_new_int(ctrl, &c->value);
1072
1073         case V4L2_CTRL_TYPE_INTEGER64:
1074                 return 0;
1075
1076         case V4L2_CTRL_TYPE_STRING:
1077                 len = strlen(s);
1078                 if (len < ctrl->minimum)
1079                         return -ERANGE;
1080                 if ((len - ctrl->minimum) % ctrl->step)
1081                         return -ERANGE;
1082                 return 0;
1083
1084         default:
1085                 return -EINVAL;
1086         }
1087 }
1088
1089 static inline u32 node2id(struct list_head *node)
1090 {
1091         return list_entry(node, struct v4l2_ctrl_ref, node)->ctrl->id;
1092 }
1093
1094 /* Set the handler's error code if it wasn't set earlier already */
1095 static inline int handler_set_err(struct v4l2_ctrl_handler *hdl, int err)
1096 {
1097         if (hdl->error == 0)
1098                 hdl->error = err;
1099         return err;
1100 }
1101
1102 /* Initialize the handler */
1103 int v4l2_ctrl_handler_init(struct v4l2_ctrl_handler *hdl,
1104                            unsigned nr_of_controls_hint)
1105 {
1106         mutex_init(&hdl->lock);
1107         INIT_LIST_HEAD(&hdl->ctrls);
1108         INIT_LIST_HEAD(&hdl->ctrl_refs);
1109         hdl->nr_of_buckets = 1 + nr_of_controls_hint / 8;
1110         hdl->buckets = kzalloc(sizeof(hdl->buckets[0]) * hdl->nr_of_buckets,
1111                                                                 GFP_KERNEL);
1112         hdl->error = hdl->buckets ? 0 : -ENOMEM;
1113         return hdl->error;
1114 }
1115 EXPORT_SYMBOL(v4l2_ctrl_handler_init);
1116
1117 /* Free all controls and control refs */
1118 void v4l2_ctrl_handler_free(struct v4l2_ctrl_handler *hdl)
1119 {
1120         struct v4l2_ctrl_ref *ref, *next_ref;
1121         struct v4l2_ctrl *ctrl, *next_ctrl;
1122         struct v4l2_subscribed_event *sev, *next_sev;
1123
1124         if (hdl == NULL || hdl->buckets == NULL)
1125                 return;
1126
1127         mutex_lock(&hdl->lock);
1128         /* Free all nodes */
1129         list_for_each_entry_safe(ref, next_ref, &hdl->ctrl_refs, node) {
1130                 list_del(&ref->node);
1131                 kfree(ref);
1132         }
1133         /* Free all controls owned by the handler */
1134         list_for_each_entry_safe(ctrl, next_ctrl, &hdl->ctrls, node) {
1135                 list_del(&ctrl->node);
1136                 list_for_each_entry_safe(sev, next_sev, &ctrl->ev_subs, node)
1137                         list_del(&sev->node);
1138                 kfree(ctrl);
1139         }
1140         kfree(hdl->buckets);
1141         hdl->buckets = NULL;
1142         hdl->cached = NULL;
1143         hdl->error = 0;
1144         mutex_unlock(&hdl->lock);
1145 }
1146 EXPORT_SYMBOL(v4l2_ctrl_handler_free);
1147
1148 /* For backwards compatibility: V4L2_CID_PRIVATE_BASE should no longer
1149    be used except in G_CTRL, S_CTRL, QUERYCTRL and QUERYMENU when dealing
1150    with applications that do not use the NEXT_CTRL flag.
1151
1152    We just find the n-th private user control. It's O(N), but that should not
1153    be an issue in this particular case. */
1154 static struct v4l2_ctrl_ref *find_private_ref(
1155                 struct v4l2_ctrl_handler *hdl, u32 id)
1156 {
1157         struct v4l2_ctrl_ref *ref;
1158
1159         id -= V4L2_CID_PRIVATE_BASE;
1160         list_for_each_entry(ref, &hdl->ctrl_refs, node) {
1161                 /* Search for private user controls that are compatible with
1162                    VIDIOC_G/S_CTRL. */
1163                 if (V4L2_CTRL_ID2CLASS(ref->ctrl->id) == V4L2_CTRL_CLASS_USER &&
1164                     V4L2_CTRL_DRIVER_PRIV(ref->ctrl->id)) {
1165                         if (!type_is_int(ref->ctrl))
1166                                 continue;
1167                         if (id == 0)
1168                                 return ref;
1169                         id--;
1170                 }
1171         }
1172         return NULL;
1173 }
1174
1175 /* Find a control with the given ID. */
1176 static struct v4l2_ctrl_ref *find_ref(struct v4l2_ctrl_handler *hdl, u32 id)
1177 {
1178         struct v4l2_ctrl_ref *ref;
1179         int bucket;
1180
1181         id &= V4L2_CTRL_ID_MASK;
1182
1183         /* Old-style private controls need special handling */
1184         if (id >= V4L2_CID_PRIVATE_BASE)
1185                 return find_private_ref(hdl, id);
1186         bucket = id % hdl->nr_of_buckets;
1187
1188         /* Simple optimization: cache the last control found */
1189         if (hdl->cached && hdl->cached->ctrl->id == id)
1190                 return hdl->cached;
1191
1192         /* Not in cache, search the hash */
1193         ref = hdl->buckets ? hdl->buckets[bucket] : NULL;
1194         while (ref && ref->ctrl->id != id)
1195                 ref = ref->next;
1196
1197         if (ref)
1198                 hdl->cached = ref; /* cache it! */
1199         return ref;
1200 }
1201
1202 /* Find a control with the given ID. Take the handler's lock first. */
1203 static struct v4l2_ctrl_ref *find_ref_lock(
1204                 struct v4l2_ctrl_handler *hdl, u32 id)
1205 {
1206         struct v4l2_ctrl_ref *ref = NULL;
1207
1208         if (hdl) {
1209                 mutex_lock(&hdl->lock);
1210                 ref = find_ref(hdl, id);
1211                 mutex_unlock(&hdl->lock);
1212         }
1213         return ref;
1214 }
1215
1216 /* Find a control with the given ID. */
1217 struct v4l2_ctrl *v4l2_ctrl_find(struct v4l2_ctrl_handler *hdl, u32 id)
1218 {
1219         struct v4l2_ctrl_ref *ref = find_ref_lock(hdl, id);
1220
1221         return ref ? ref->ctrl : NULL;
1222 }
1223 EXPORT_SYMBOL(v4l2_ctrl_find);
1224
1225 /* Allocate a new v4l2_ctrl_ref and hook it into the handler. */
1226 static int handler_new_ref(struct v4l2_ctrl_handler *hdl,
1227                            struct v4l2_ctrl *ctrl)
1228 {
1229         struct v4l2_ctrl_ref *ref;
1230         struct v4l2_ctrl_ref *new_ref;
1231         u32 id = ctrl->id;
1232         u32 class_ctrl = V4L2_CTRL_ID2CLASS(id) | 1;
1233         int bucket = id % hdl->nr_of_buckets;   /* which bucket to use */
1234
1235         /* Automatically add the control class if it is not yet present. */
1236         if (id != class_ctrl && find_ref_lock(hdl, class_ctrl) == NULL)
1237                 if (!v4l2_ctrl_new_std(hdl, NULL, class_ctrl, 0, 0, 0, 0))
1238                         return hdl->error;
1239
1240         if (hdl->error)
1241                 return hdl->error;
1242
1243         new_ref = kzalloc(sizeof(*new_ref), GFP_KERNEL);
1244         if (!new_ref)
1245                 return handler_set_err(hdl, -ENOMEM);
1246         new_ref->ctrl = ctrl;
1247         if (ctrl->handler == hdl) {
1248                 /* By default each control starts in a cluster of its own.
1249                    new_ref->ctrl is basically a cluster array with one
1250                    element, so that's perfect to use as the cluster pointer.
1251                    But only do this for the handler that owns the control. */
1252                 ctrl->cluster = &new_ref->ctrl;
1253                 ctrl->ncontrols = 1;
1254         }
1255
1256         INIT_LIST_HEAD(&new_ref->node);
1257
1258         mutex_lock(&hdl->lock);
1259
1260         /* Add immediately at the end of the list if the list is empty, or if
1261            the last element in the list has a lower ID.
1262            This ensures that when elements are added in ascending order the
1263            insertion is an O(1) operation. */
1264         if (list_empty(&hdl->ctrl_refs) || id > node2id(hdl->ctrl_refs.prev)) {
1265                 list_add_tail(&new_ref->node, &hdl->ctrl_refs);
1266                 goto insert_in_hash;
1267         }
1268
1269         /* Find insert position in sorted list */
1270         list_for_each_entry(ref, &hdl->ctrl_refs, node) {
1271                 if (ref->ctrl->id < id)
1272                         continue;
1273                 /* Don't add duplicates */
1274                 if (ref->ctrl->id == id) {
1275                         kfree(new_ref);
1276                         goto unlock;
1277                 }
1278                 list_add(&new_ref->node, ref->node.prev);
1279                 break;
1280         }
1281
1282 insert_in_hash:
1283         /* Insert the control node in the hash */
1284         new_ref->next = hdl->buckets[bucket];
1285         hdl->buckets[bucket] = new_ref;
1286
1287 unlock:
1288         mutex_unlock(&hdl->lock);
1289         return 0;
1290 }
1291
1292 /* Add a new control */
1293 static struct v4l2_ctrl *v4l2_ctrl_new(struct v4l2_ctrl_handler *hdl,
1294                         const struct v4l2_ctrl_ops *ops,
1295                         u32 id, const char *name, enum v4l2_ctrl_type type,
1296                         s32 min, s32 max, u32 step, s32 def,
1297                         u32 flags, const char * const *qmenu, void *priv)
1298 {
1299         struct v4l2_ctrl *ctrl;
1300         unsigned sz_extra = 0;
1301
1302         if (hdl->error)
1303                 return NULL;
1304
1305         /* Sanity checks */
1306         if (id == 0 || name == NULL || id >= V4L2_CID_PRIVATE_BASE ||
1307             (type == V4L2_CTRL_TYPE_INTEGER && step == 0) ||
1308             (type == V4L2_CTRL_TYPE_BITMASK && max == 0) ||
1309             (type == V4L2_CTRL_TYPE_MENU && qmenu == NULL) ||
1310             (type == V4L2_CTRL_TYPE_STRING && max == 0)) {
1311                 handler_set_err(hdl, -ERANGE);
1312                 return NULL;
1313         }
1314         if (type != V4L2_CTRL_TYPE_BITMASK && max < min) {
1315                 handler_set_err(hdl, -ERANGE);
1316                 return NULL;
1317         }
1318         if ((type == V4L2_CTRL_TYPE_INTEGER ||
1319              type == V4L2_CTRL_TYPE_MENU ||
1320              type == V4L2_CTRL_TYPE_BOOLEAN) &&
1321             (def < min || def > max)) {
1322                 handler_set_err(hdl, -ERANGE);
1323                 return NULL;
1324         }
1325         if (type == V4L2_CTRL_TYPE_BITMASK && ((def & ~max) || min || step)) {
1326                 handler_set_err(hdl, -ERANGE);
1327                 return NULL;
1328         }
1329
1330         if (type == V4L2_CTRL_TYPE_BUTTON)
1331                 flags |= V4L2_CTRL_FLAG_WRITE_ONLY;
1332         else if (type == V4L2_CTRL_TYPE_CTRL_CLASS)
1333                 flags |= V4L2_CTRL_FLAG_READ_ONLY;
1334         else if (type == V4L2_CTRL_TYPE_STRING)
1335                 sz_extra += 2 * (max + 1);
1336
1337         ctrl = kzalloc(sizeof(*ctrl) + sz_extra, GFP_KERNEL);
1338         if (ctrl == NULL) {
1339                 handler_set_err(hdl, -ENOMEM);
1340                 return NULL;
1341         }
1342
1343         INIT_LIST_HEAD(&ctrl->node);
1344         INIT_LIST_HEAD(&ctrl->ev_subs);
1345         ctrl->handler = hdl;
1346         ctrl->ops = ops;
1347         ctrl->id = id;
1348         ctrl->name = name;
1349         ctrl->type = type;
1350         ctrl->flags = flags;
1351         ctrl->minimum = min;
1352         ctrl->maximum = max;
1353         ctrl->step = step;
1354         ctrl->qmenu = qmenu;
1355         ctrl->priv = priv;
1356         ctrl->cur.val = ctrl->val = ctrl->default_value = def;
1357
1358         if (ctrl->type == V4L2_CTRL_TYPE_STRING) {
1359                 ctrl->cur.string = (char *)&ctrl[1] + sz_extra - (max + 1);
1360                 ctrl->string = (char *)&ctrl[1] + sz_extra - 2 * (max + 1);
1361                 if (ctrl->minimum)
1362                         memset(ctrl->cur.string, ' ', ctrl->minimum);
1363         }
1364         if (handler_new_ref(hdl, ctrl)) {
1365                 kfree(ctrl);
1366                 return NULL;
1367         }
1368         mutex_lock(&hdl->lock);
1369         list_add_tail(&ctrl->node, &hdl->ctrls);
1370         mutex_unlock(&hdl->lock);
1371         return ctrl;
1372 }
1373
1374 struct v4l2_ctrl *v4l2_ctrl_new_custom(struct v4l2_ctrl_handler *hdl,
1375                         const struct v4l2_ctrl_config *cfg, void *priv)
1376 {
1377         bool is_menu;
1378         struct v4l2_ctrl *ctrl;
1379         const char *name = cfg->name;
1380         const char * const *qmenu = cfg->qmenu;
1381         enum v4l2_ctrl_type type = cfg->type;
1382         u32 flags = cfg->flags;
1383         s32 min = cfg->min;
1384         s32 max = cfg->max;
1385         u32 step = cfg->step;
1386         s32 def = cfg->def;
1387
1388         if (name == NULL)
1389                 v4l2_ctrl_fill(cfg->id, &name, &type, &min, &max, &step,
1390                                                                 &def, &flags);
1391
1392         is_menu = (cfg->type == V4L2_CTRL_TYPE_MENU);
1393         if (is_menu)
1394                 WARN_ON(step);
1395         else
1396                 WARN_ON(cfg->menu_skip_mask);
1397         if (is_menu && qmenu == NULL)
1398                 qmenu = v4l2_ctrl_get_menu(cfg->id);
1399
1400         ctrl = v4l2_ctrl_new(hdl, cfg->ops, cfg->id, name,
1401                         type, min, max,
1402                         is_menu ? cfg->menu_skip_mask : step,
1403                         def, flags, qmenu, priv);
1404         if (ctrl)
1405                 ctrl->is_private = cfg->is_private;
1406         return ctrl;
1407 }
1408 EXPORT_SYMBOL(v4l2_ctrl_new_custom);
1409
1410 /* Helper function for standard non-menu controls */
1411 struct v4l2_ctrl *v4l2_ctrl_new_std(struct v4l2_ctrl_handler *hdl,
1412                         const struct v4l2_ctrl_ops *ops,
1413                         u32 id, s32 min, s32 max, u32 step, s32 def)
1414 {
1415         const char *name;
1416         enum v4l2_ctrl_type type;
1417         u32 flags;
1418
1419         v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
1420         if (type == V4L2_CTRL_TYPE_MENU) {
1421                 handler_set_err(hdl, -EINVAL);
1422                 return NULL;
1423         }
1424         return v4l2_ctrl_new(hdl, ops, id, name, type,
1425                                     min, max, step, def, flags, NULL, NULL);
1426 }
1427 EXPORT_SYMBOL(v4l2_ctrl_new_std);
1428
1429 /* Helper function for standard menu controls */
1430 struct v4l2_ctrl *v4l2_ctrl_new_std_menu(struct v4l2_ctrl_handler *hdl,
1431                         const struct v4l2_ctrl_ops *ops,
1432                         u32 id, s32 max, s32 mask, s32 def)
1433 {
1434         const char * const *qmenu = v4l2_ctrl_get_menu(id);
1435         const char *name;
1436         enum v4l2_ctrl_type type;
1437         s32 min;
1438         s32 step;
1439         u32 flags;
1440
1441         v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
1442         if (type != V4L2_CTRL_TYPE_MENU) {
1443                 handler_set_err(hdl, -EINVAL);
1444                 return NULL;
1445         }
1446         return v4l2_ctrl_new(hdl, ops, id, name, type,
1447                                     0, max, mask, def, flags, qmenu, NULL);
1448 }
1449 EXPORT_SYMBOL(v4l2_ctrl_new_std_menu);
1450
1451 /* Add a control from another handler to this handler */
1452 struct v4l2_ctrl *v4l2_ctrl_add_ctrl(struct v4l2_ctrl_handler *hdl,
1453                                           struct v4l2_ctrl *ctrl)
1454 {
1455         if (hdl == NULL || hdl->error)
1456                 return NULL;
1457         if (ctrl == NULL) {
1458                 handler_set_err(hdl, -EINVAL);
1459                 return NULL;
1460         }
1461         if (ctrl->handler == hdl)
1462                 return ctrl;
1463         return handler_new_ref(hdl, ctrl) ? NULL : ctrl;
1464 }
1465 EXPORT_SYMBOL(v4l2_ctrl_add_ctrl);
1466
1467 /* Add the controls from another handler to our own. */
1468 int v4l2_ctrl_add_handler(struct v4l2_ctrl_handler *hdl,
1469                           struct v4l2_ctrl_handler *add)
1470 {
1471         struct v4l2_ctrl *ctrl;
1472         int ret = 0;
1473
1474         /* Do nothing if either handler is NULL or if they are the same */
1475         if (!hdl || !add || hdl == add)
1476                 return 0;
1477         if (hdl->error)
1478                 return hdl->error;
1479         mutex_lock(&add->lock);
1480         list_for_each_entry(ctrl, &add->ctrls, node) {
1481                 /* Skip handler-private controls. */
1482                 if (ctrl->is_private)
1483                         continue;
1484                 /* And control classes */
1485                 if (ctrl->type == V4L2_CTRL_TYPE_CTRL_CLASS)
1486                         continue;
1487                 ret = handler_new_ref(hdl, ctrl);
1488                 if (ret)
1489                         break;
1490         }
1491         mutex_unlock(&add->lock);
1492         return ret;
1493 }
1494 EXPORT_SYMBOL(v4l2_ctrl_add_handler);
1495
1496 /* Cluster controls */
1497 void v4l2_ctrl_cluster(unsigned ncontrols, struct v4l2_ctrl **controls)
1498 {
1499         bool has_volatiles = false;
1500         int i;
1501
1502         /* The first control is the master control and it must not be NULL */
1503         BUG_ON(ncontrols == 0 || controls[0] == NULL);
1504
1505         for (i = 0; i < ncontrols; i++) {
1506                 if (controls[i]) {
1507                         controls[i]->cluster = controls;
1508                         controls[i]->ncontrols = ncontrols;
1509                         if (controls[i]->flags & V4L2_CTRL_FLAG_VOLATILE)
1510                                 has_volatiles = true;
1511                 }
1512         }
1513         controls[0]->has_volatiles = has_volatiles;
1514 }
1515 EXPORT_SYMBOL(v4l2_ctrl_cluster);
1516
1517 void v4l2_ctrl_auto_cluster(unsigned ncontrols, struct v4l2_ctrl **controls,
1518                             u8 manual_val, bool set_volatile)
1519 {
1520         struct v4l2_ctrl *master = controls[0];
1521         u32 flag = 0;
1522         int i;
1523
1524         v4l2_ctrl_cluster(ncontrols, controls);
1525         WARN_ON(ncontrols <= 1);
1526         WARN_ON(manual_val < master->minimum || manual_val > master->maximum);
1527         WARN_ON(set_volatile && !has_op(master, g_volatile_ctrl));
1528         master->is_auto = true;
1529         master->has_volatiles = set_volatile;
1530         master->manual_mode_value = manual_val;
1531         master->flags |= V4L2_CTRL_FLAG_UPDATE;
1532
1533         if (!is_cur_manual(master))
1534                 flag = V4L2_CTRL_FLAG_INACTIVE |
1535                         (set_volatile ? V4L2_CTRL_FLAG_VOLATILE : 0);
1536
1537         for (i = 1; i < ncontrols; i++)
1538                 if (controls[i])
1539                         controls[i]->flags |= flag;
1540 }
1541 EXPORT_SYMBOL(v4l2_ctrl_auto_cluster);
1542
1543 /* Activate/deactivate a control. */
1544 void v4l2_ctrl_activate(struct v4l2_ctrl *ctrl, bool active)
1545 {
1546         /* invert since the actual flag is called 'inactive' */
1547         bool inactive = !active;
1548         bool old;
1549
1550         if (ctrl == NULL)
1551                 return;
1552
1553         if (inactive)
1554                 /* set V4L2_CTRL_FLAG_INACTIVE */
1555                 old = test_and_set_bit(4, &ctrl->flags);
1556         else
1557                 /* clear V4L2_CTRL_FLAG_INACTIVE */
1558                 old = test_and_clear_bit(4, &ctrl->flags);
1559         if (old != inactive)
1560                 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_FLAGS);
1561 }
1562 EXPORT_SYMBOL(v4l2_ctrl_activate);
1563
1564 /* Grab/ungrab a control.
1565    Typically used when streaming starts and you want to grab controls,
1566    preventing the user from changing them.
1567
1568    Just call this and the framework will block any attempts to change
1569    these controls. */
1570 void v4l2_ctrl_grab(struct v4l2_ctrl *ctrl, bool grabbed)
1571 {
1572         bool old;
1573
1574         if (ctrl == NULL)
1575                 return;
1576
1577         v4l2_ctrl_lock(ctrl);
1578         if (grabbed)
1579                 /* set V4L2_CTRL_FLAG_GRABBED */
1580                 old = test_and_set_bit(1, &ctrl->flags);
1581         else
1582                 /* clear V4L2_CTRL_FLAG_GRABBED */
1583                 old = test_and_clear_bit(1, &ctrl->flags);
1584         if (old != grabbed)
1585                 send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_FLAGS);
1586         v4l2_ctrl_unlock(ctrl);
1587 }
1588 EXPORT_SYMBOL(v4l2_ctrl_grab);
1589
1590 /* Log the control name and value */
1591 static void log_ctrl(const struct v4l2_ctrl *ctrl,
1592                      const char *prefix, const char *colon)
1593 {
1594         if (ctrl->flags & (V4L2_CTRL_FLAG_DISABLED | V4L2_CTRL_FLAG_WRITE_ONLY))
1595                 return;
1596         if (ctrl->type == V4L2_CTRL_TYPE_CTRL_CLASS)
1597                 return;
1598
1599         printk(KERN_INFO "%s%s%s: ", prefix, colon, ctrl->name);
1600
1601         switch (ctrl->type) {
1602         case V4L2_CTRL_TYPE_INTEGER:
1603                 printk(KERN_CONT "%d", ctrl->cur.val);
1604                 break;
1605         case V4L2_CTRL_TYPE_BOOLEAN:
1606                 printk(KERN_CONT "%s", ctrl->cur.val ? "true" : "false");
1607                 break;
1608         case V4L2_CTRL_TYPE_MENU:
1609                 printk(KERN_CONT "%s", ctrl->qmenu[ctrl->cur.val]);
1610                 break;
1611         case V4L2_CTRL_TYPE_BITMASK:
1612                 printk(KERN_CONT "0x%08x", ctrl->cur.val);
1613                 break;
1614         case V4L2_CTRL_TYPE_INTEGER64:
1615                 printk(KERN_CONT "%lld", ctrl->cur.val64);
1616                 break;
1617         case V4L2_CTRL_TYPE_STRING:
1618                 printk(KERN_CONT "%s", ctrl->cur.string);
1619                 break;
1620         default:
1621                 printk(KERN_CONT "unknown type %d", ctrl->type);
1622                 break;
1623         }
1624         if (ctrl->flags & (V4L2_CTRL_FLAG_INACTIVE |
1625                            V4L2_CTRL_FLAG_GRABBED |
1626                            V4L2_CTRL_FLAG_VOLATILE)) {
1627                 if (ctrl->flags & V4L2_CTRL_FLAG_INACTIVE)
1628                         printk(KERN_CONT " inactive");
1629                 if (ctrl->flags & V4L2_CTRL_FLAG_GRABBED)
1630                         printk(KERN_CONT " grabbed");
1631                 if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE)
1632                         printk(KERN_CONT " volatile");
1633         }
1634         printk(KERN_CONT "\n");
1635 }
1636
1637 /* Log all controls owned by the handler */
1638 void v4l2_ctrl_handler_log_status(struct v4l2_ctrl_handler *hdl,
1639                                   const char *prefix)
1640 {
1641         struct v4l2_ctrl *ctrl;
1642         const char *colon = "";
1643         int len;
1644
1645         if (hdl == NULL)
1646                 return;
1647         if (prefix == NULL)
1648                 prefix = "";
1649         len = strlen(prefix);
1650         if (len && prefix[len - 1] != ' ')
1651                 colon = ": ";
1652         mutex_lock(&hdl->lock);
1653         list_for_each_entry(ctrl, &hdl->ctrls, node)
1654                 if (!(ctrl->flags & V4L2_CTRL_FLAG_DISABLED))
1655                         log_ctrl(ctrl, prefix, colon);
1656         mutex_unlock(&hdl->lock);
1657 }
1658 EXPORT_SYMBOL(v4l2_ctrl_handler_log_status);
1659
1660 /* Call s_ctrl for all controls owned by the handler */
1661 int v4l2_ctrl_handler_setup(struct v4l2_ctrl_handler *hdl)
1662 {
1663         struct v4l2_ctrl *ctrl;
1664         int ret = 0;
1665
1666         if (hdl == NULL)
1667                 return 0;
1668         mutex_lock(&hdl->lock);
1669         list_for_each_entry(ctrl, &hdl->ctrls, node)
1670                 ctrl->done = false;
1671
1672         list_for_each_entry(ctrl, &hdl->ctrls, node) {
1673                 struct v4l2_ctrl *master = ctrl->cluster[0];
1674                 int i;
1675
1676                 /* Skip if this control was already handled by a cluster. */
1677                 /* Skip button controls and read-only controls. */
1678                 if (ctrl->done || ctrl->type == V4L2_CTRL_TYPE_BUTTON ||
1679                     (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY))
1680                         continue;
1681
1682                 for (i = 0; i < master->ncontrols; i++) {
1683                         if (master->cluster[i]) {
1684                                 cur_to_new(master->cluster[i]);
1685                                 master->cluster[i]->is_new = 1;
1686                                 master->cluster[i]->done = true;
1687                         }
1688                 }
1689                 ret = call_op(master, s_ctrl);
1690                 if (ret)
1691                         break;
1692         }
1693         mutex_unlock(&hdl->lock);
1694         return ret;
1695 }
1696 EXPORT_SYMBOL(v4l2_ctrl_handler_setup);
1697
1698 /* Implement VIDIOC_QUERYCTRL */
1699 int v4l2_queryctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_queryctrl *qc)
1700 {
1701         u32 id = qc->id & V4L2_CTRL_ID_MASK;
1702         struct v4l2_ctrl_ref *ref;
1703         struct v4l2_ctrl *ctrl;
1704
1705         if (hdl == NULL)
1706                 return -EINVAL;
1707
1708         mutex_lock(&hdl->lock);
1709
1710         /* Try to find it */
1711         ref = find_ref(hdl, id);
1712
1713         if ((qc->id & V4L2_CTRL_FLAG_NEXT_CTRL) && !list_empty(&hdl->ctrl_refs)) {
1714                 /* Find the next control with ID > qc->id */
1715
1716                 /* Did we reach the end of the control list? */
1717                 if (id >= node2id(hdl->ctrl_refs.prev)) {
1718                         ref = NULL; /* Yes, so there is no next control */
1719                 } else if (ref) {
1720                         /* We found a control with the given ID, so just get
1721                            the next one in the list. */
1722                         ref = list_entry(ref->node.next, typeof(*ref), node);
1723                 } else {
1724                         /* No control with the given ID exists, so start
1725                            searching for the next largest ID. We know there
1726                            is one, otherwise the first 'if' above would have
1727                            been true. */
1728                         list_for_each_entry(ref, &hdl->ctrl_refs, node)
1729                                 if (id < ref->ctrl->id)
1730                                         break;
1731                 }
1732         }
1733         mutex_unlock(&hdl->lock);
1734         if (!ref)
1735                 return -EINVAL;
1736
1737         ctrl = ref->ctrl;
1738         memset(qc, 0, sizeof(*qc));
1739         if (id >= V4L2_CID_PRIVATE_BASE)
1740                 qc->id = id;
1741         else
1742                 qc->id = ctrl->id;
1743         strlcpy(qc->name, ctrl->name, sizeof(qc->name));
1744         qc->minimum = ctrl->minimum;
1745         qc->maximum = ctrl->maximum;
1746         qc->default_value = ctrl->default_value;
1747         if (ctrl->type == V4L2_CTRL_TYPE_MENU)
1748                 qc->step = 1;
1749         else
1750                 qc->step = ctrl->step;
1751         qc->flags = ctrl->flags;
1752         qc->type = ctrl->type;
1753         return 0;
1754 }
1755 EXPORT_SYMBOL(v4l2_queryctrl);
1756
1757 int v4l2_subdev_queryctrl(struct v4l2_subdev *sd, struct v4l2_queryctrl *qc)
1758 {
1759         if (qc->id & V4L2_CTRL_FLAG_NEXT_CTRL)
1760                 return -EINVAL;
1761         return v4l2_queryctrl(sd->ctrl_handler, qc);
1762 }
1763 EXPORT_SYMBOL(v4l2_subdev_queryctrl);
1764
1765 /* Implement VIDIOC_QUERYMENU */
1766 int v4l2_querymenu(struct v4l2_ctrl_handler *hdl, struct v4l2_querymenu *qm)
1767 {
1768         struct v4l2_ctrl *ctrl;
1769         u32 i = qm->index;
1770
1771         ctrl = v4l2_ctrl_find(hdl, qm->id);
1772         if (!ctrl)
1773                 return -EINVAL;
1774
1775         qm->reserved = 0;
1776         /* Sanity checks */
1777         if (ctrl->qmenu == NULL ||
1778             i < ctrl->minimum || i > ctrl->maximum)
1779                 return -EINVAL;
1780         /* Use mask to see if this menu item should be skipped */
1781         if (ctrl->menu_skip_mask & (1 << i))
1782                 return -EINVAL;
1783         /* Empty menu items should also be skipped */
1784         if (ctrl->qmenu[i] == NULL || ctrl->qmenu[i][0] == '\0')
1785                 return -EINVAL;
1786         strlcpy(qm->name, ctrl->qmenu[i], sizeof(qm->name));
1787         return 0;
1788 }
1789 EXPORT_SYMBOL(v4l2_querymenu);
1790
1791 int v4l2_subdev_querymenu(struct v4l2_subdev *sd, struct v4l2_querymenu *qm)
1792 {
1793         return v4l2_querymenu(sd->ctrl_handler, qm);
1794 }
1795 EXPORT_SYMBOL(v4l2_subdev_querymenu);
1796
1797
1798
1799 /* Some general notes on the atomic requirements of VIDIOC_G/TRY/S_EXT_CTRLS:
1800
1801    It is not a fully atomic operation, just best-effort only. After all, if
1802    multiple controls have to be set through multiple i2c writes (for example)
1803    then some initial writes may succeed while others fail. Thus leaving the
1804    system in an inconsistent state. The question is how much effort you are
1805    willing to spend on trying to make something atomic that really isn't.
1806
1807    From the point of view of an application the main requirement is that
1808    when you call VIDIOC_S_EXT_CTRLS and some values are invalid then an
1809    error should be returned without actually affecting any controls.
1810
1811    If all the values are correct, then it is acceptable to just give up
1812    in case of low-level errors.
1813
1814    It is important though that the application can tell when only a partial
1815    configuration was done. The way we do that is through the error_idx field
1816    of struct v4l2_ext_controls: if that is equal to the count field then no
1817    controls were affected. Otherwise all controls before that index were
1818    successful in performing their 'get' or 'set' operation, the control at
1819    the given index failed, and you don't know what happened with the controls
1820    after the failed one. Since if they were part of a control cluster they
1821    could have been successfully processed (if a cluster member was encountered
1822    at index < error_idx), they could have failed (if a cluster member was at
1823    error_idx), or they may not have been processed yet (if the first cluster
1824    member appeared after error_idx).
1825
1826    It is all fairly theoretical, though. In practice all you can do is to
1827    bail out. If error_idx == count, then it is an application bug. If
1828    error_idx < count then it is only an application bug if the error code was
1829    EBUSY. That usually means that something started streaming just when you
1830    tried to set the controls. In all other cases it is a driver/hardware
1831    problem and all you can do is to retry or bail out.
1832
1833    Note that these rules do not apply to VIDIOC_TRY_EXT_CTRLS: since that
1834    never modifies controls the error_idx is just set to whatever control
1835    has an invalid value.
1836  */
1837
1838 /* Prepare for the extended g/s/try functions.
1839    Find the controls in the control array and do some basic checks. */
1840 static int prepare_ext_ctrls(struct v4l2_ctrl_handler *hdl,
1841                              struct v4l2_ext_controls *cs,
1842                              struct v4l2_ctrl_helper *helpers)
1843 {
1844         struct v4l2_ctrl_helper *h;
1845         bool have_clusters = false;
1846         u32 i;
1847
1848         for (i = 0, h = helpers; i < cs->count; i++, h++) {
1849                 struct v4l2_ext_control *c = &cs->controls[i];
1850                 struct v4l2_ctrl_ref *ref;
1851                 struct v4l2_ctrl *ctrl;
1852                 u32 id = c->id & V4L2_CTRL_ID_MASK;
1853
1854                 cs->error_idx = i;
1855
1856                 if (cs->ctrl_class && V4L2_CTRL_ID2CLASS(id) != cs->ctrl_class)
1857                         return -EINVAL;
1858
1859                 /* Old-style private controls are not allowed for
1860                    extended controls */
1861                 if (id >= V4L2_CID_PRIVATE_BASE)
1862                         return -EINVAL;
1863                 ref = find_ref_lock(hdl, id);
1864                 if (ref == NULL)
1865                         return -EINVAL;
1866                 ctrl = ref->ctrl;
1867                 if (ctrl->flags & V4L2_CTRL_FLAG_DISABLED)
1868                         return -EINVAL;
1869
1870                 if (ctrl->cluster[0]->ncontrols > 1)
1871                         have_clusters = true;
1872                 if (ctrl->cluster[0] != ctrl)
1873                         ref = find_ref_lock(hdl, ctrl->cluster[0]->id);
1874                 /* Store the ref to the master control of the cluster */
1875                 h->mref = ref;
1876                 h->ctrl = ctrl;
1877                 /* Initially set next to 0, meaning that there is no other
1878                    control in this helper array belonging to the same
1879                    cluster */
1880                 h->next = 0;
1881         }
1882
1883         /* We are done if there were no controls that belong to a multi-
1884            control cluster. */
1885         if (!have_clusters)
1886                 return 0;
1887
1888         /* The code below figures out in O(n) time which controls in the list
1889            belong to the same cluster. */
1890
1891         /* This has to be done with the handler lock taken. */
1892         mutex_lock(&hdl->lock);
1893
1894         /* First zero the helper field in the master control references */
1895         for (i = 0; i < cs->count; i++)
1896                 helpers[i].mref->helper = 0;
1897         for (i = 0, h = helpers; i < cs->count; i++, h++) {
1898                 struct v4l2_ctrl_ref *mref = h->mref;
1899
1900                 /* If the mref->helper is set, then it points to an earlier
1901                    helper that belongs to the same cluster. */
1902                 if (mref->helper) {
1903                         /* Set the next field of mref->helper to the current
1904                            index: this means that that earlier helper now
1905                            points to the next helper in the same cluster. */
1906                         mref->helper->next = i;
1907                         /* mref should be set only for the first helper in the
1908                            cluster, clear the others. */
1909                         h->mref = NULL;
1910                 }
1911                 /* Point the mref helper to the current helper struct. */
1912                 mref->helper = h;
1913         }
1914         mutex_unlock(&hdl->lock);
1915         return 0;
1916 }
1917
1918 /* Handles the corner case where cs->count == 0. It checks whether the
1919    specified control class exists. If that class ID is 0, then it checks
1920    whether there are any controls at all. */
1921 static int class_check(struct v4l2_ctrl_handler *hdl, u32 ctrl_class)
1922 {
1923         if (ctrl_class == 0)
1924                 return list_empty(&hdl->ctrl_refs) ? -EINVAL : 0;
1925         return find_ref_lock(hdl, ctrl_class | 1) ? 0 : -EINVAL;
1926 }
1927
1928
1929
1930 /* Get extended controls. Allocates the helpers array if needed. */
1931 int v4l2_g_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *cs)
1932 {
1933         struct v4l2_ctrl_helper helper[4];
1934         struct v4l2_ctrl_helper *helpers = helper;
1935         int ret;
1936         int i, j;
1937
1938         cs->error_idx = cs->count;
1939         cs->ctrl_class = V4L2_CTRL_ID2CLASS(cs->ctrl_class);
1940
1941         if (hdl == NULL)
1942                 return -EINVAL;
1943
1944         if (cs->count == 0)
1945                 return class_check(hdl, cs->ctrl_class);
1946
1947         if (cs->count > ARRAY_SIZE(helper)) {
1948                 helpers = kmalloc(sizeof(helper[0]) * cs->count, GFP_KERNEL);
1949                 if (helpers == NULL)
1950                         return -ENOMEM;
1951         }
1952
1953         ret = prepare_ext_ctrls(hdl, cs, helpers);
1954         cs->error_idx = cs->count;
1955
1956         for (i = 0; !ret && i < cs->count; i++)
1957                 if (helpers[i].ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY)
1958                         ret = -EACCES;
1959
1960         for (i = 0; !ret && i < cs->count; i++) {
1961                 int (*ctrl_to_user)(struct v4l2_ext_control *c,
1962                                     struct v4l2_ctrl *ctrl) = cur_to_user;
1963                 struct v4l2_ctrl *master;
1964
1965                 if (helpers[i].mref == NULL)
1966                         continue;
1967
1968                 master = helpers[i].mref->ctrl;
1969                 cs->error_idx = i;
1970
1971                 v4l2_ctrl_lock(master);
1972
1973                 /* g_volatile_ctrl will update the new control values */
1974                 if ((master->flags & V4L2_CTRL_FLAG_VOLATILE) ||
1975                         (master->has_volatiles && !is_cur_manual(master))) {
1976                         for (j = 0; j < master->ncontrols; j++)
1977                                 cur_to_new(master->cluster[j]);
1978                         ret = call_op(master, g_volatile_ctrl);
1979                         ctrl_to_user = new_to_user;
1980                 }
1981                 /* If OK, then copy the current (for non-volatile controls)
1982                    or the new (for volatile controls) control values to the
1983                    caller */
1984                 if (!ret) {
1985                         u32 idx = i;
1986
1987                         do {
1988                                 ret = ctrl_to_user(cs->controls + idx,
1989                                                    helpers[idx].ctrl);
1990                                 idx = helpers[idx].next;
1991                         } while (!ret && idx);
1992                 }
1993                 v4l2_ctrl_unlock(master);
1994         }
1995
1996         if (cs->count > ARRAY_SIZE(helper))
1997                 kfree(helpers);
1998         return ret;
1999 }
2000 EXPORT_SYMBOL(v4l2_g_ext_ctrls);
2001
2002 int v4l2_subdev_g_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs)
2003 {
2004         return v4l2_g_ext_ctrls(sd->ctrl_handler, cs);
2005 }
2006 EXPORT_SYMBOL(v4l2_subdev_g_ext_ctrls);
2007
2008 /* Helper function to get a single control */
2009 static int get_ctrl(struct v4l2_ctrl *ctrl, s32 *val)
2010 {
2011         struct v4l2_ctrl *master = ctrl->cluster[0];
2012         int ret = 0;
2013         int i;
2014
2015         if (ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY)
2016                 return -EACCES;
2017
2018         v4l2_ctrl_lock(master);
2019         /* g_volatile_ctrl will update the current control values */
2020         if (ctrl->flags & V4L2_CTRL_FLAG_VOLATILE) {
2021                 for (i = 0; i < master->ncontrols; i++)
2022                         cur_to_new(master->cluster[i]);
2023                 ret = call_op(master, g_volatile_ctrl);
2024                 *val = ctrl->val;
2025         } else {
2026                 *val = ctrl->cur.val;
2027         }
2028         v4l2_ctrl_unlock(master);
2029         return ret;
2030 }
2031
2032 int v4l2_g_ctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_control *control)
2033 {
2034         struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, control->id);
2035
2036         if (ctrl == NULL || !type_is_int(ctrl))
2037                 return -EINVAL;
2038         return get_ctrl(ctrl, &control->value);
2039 }
2040 EXPORT_SYMBOL(v4l2_g_ctrl);
2041
2042 int v4l2_subdev_g_ctrl(struct v4l2_subdev *sd, struct v4l2_control *control)
2043 {
2044         return v4l2_g_ctrl(sd->ctrl_handler, control);
2045 }
2046 EXPORT_SYMBOL(v4l2_subdev_g_ctrl);
2047
2048 s32 v4l2_ctrl_g_ctrl(struct v4l2_ctrl *ctrl)
2049 {
2050         s32 val = 0;
2051
2052         /* It's a driver bug if this happens. */
2053         WARN_ON(!type_is_int(ctrl));
2054         get_ctrl(ctrl, &val);
2055         return val;
2056 }
2057 EXPORT_SYMBOL(v4l2_ctrl_g_ctrl);
2058
2059
2060 /* Core function that calls try/s_ctrl and ensures that the new value is
2061    copied to the current value on a set.
2062    Must be called with ctrl->handler->lock held. */
2063 static int try_or_set_cluster(struct v4l2_fh *fh,
2064                               struct v4l2_ctrl *master, bool set)
2065 {
2066         bool update_flag;
2067         int ret;
2068         int i;
2069
2070         /* Go through the cluster and either validate the new value or
2071            (if no new value was set), copy the current value to the new
2072            value, ensuring a consistent view for the control ops when
2073            called. */
2074         for (i = 0; i < master->ncontrols; i++) {
2075                 struct v4l2_ctrl *ctrl = master->cluster[i];
2076
2077                 if (ctrl == NULL)
2078                         continue;
2079
2080                 if (!ctrl->is_new) {
2081                         cur_to_new(ctrl);
2082                         continue;
2083                 }
2084                 /* Check again: it may have changed since the
2085                    previous check in try_or_set_ext_ctrls(). */
2086                 if (set && (ctrl->flags & V4L2_CTRL_FLAG_GRABBED))
2087                         return -EBUSY;
2088         }
2089
2090         ret = call_op(master, try_ctrl);
2091
2092         /* Don't set if there is no change */
2093         if (ret || !set || !cluster_changed(master))
2094                 return ret;
2095         ret = call_op(master, s_ctrl);
2096         if (ret)
2097                 return ret;
2098
2099         /* If OK, then make the new values permanent. */
2100         update_flag = is_cur_manual(master) != is_new_manual(master);
2101         for (i = 0; i < master->ncontrols; i++)
2102                 new_to_cur(fh, master->cluster[i], update_flag && i > 0);
2103         return 0;
2104 }
2105
2106 /* Validate controls. */
2107 static int validate_ctrls(struct v4l2_ext_controls *cs,
2108                           struct v4l2_ctrl_helper *helpers, bool set)
2109 {
2110         unsigned i;
2111         int ret = 0;
2112
2113         cs->error_idx = cs->count;
2114         for (i = 0; i < cs->count; i++) {
2115                 struct v4l2_ctrl *ctrl = helpers[i].ctrl;
2116
2117                 cs->error_idx = i;
2118
2119                 if (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY)
2120                         return -EACCES;
2121                 /* This test is also done in try_set_control_cluster() which
2122                    is called in atomic context, so that has the final say,
2123                    but it makes sense to do an up-front check as well. Once
2124                    an error occurs in try_set_control_cluster() some other
2125                    controls may have been set already and we want to do a
2126                    best-effort to avoid that. */
2127                 if (set && (ctrl->flags & V4L2_CTRL_FLAG_GRABBED))
2128                         return -EBUSY;
2129                 ret = validate_new(ctrl, &cs->controls[i]);
2130                 if (ret)
2131                         return ret;
2132         }
2133         return 0;
2134 }
2135
2136 /* Obtain the current volatile values of an autocluster and mark them
2137    as new. */
2138 static void update_from_auto_cluster(struct v4l2_ctrl *master)
2139 {
2140         int i;
2141
2142         for (i = 0; i < master->ncontrols; i++)
2143                 cur_to_new(master->cluster[i]);
2144         if (!call_op(master, g_volatile_ctrl))
2145                 for (i = 1; i < master->ncontrols; i++)
2146                         if (master->cluster[i])
2147                                 master->cluster[i]->is_new = 1;
2148 }
2149
2150 /* Try or try-and-set controls */
2151 static int try_set_ext_ctrls(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
2152                              struct v4l2_ext_controls *cs,
2153                              bool set)
2154 {
2155         struct v4l2_ctrl_helper helper[4];
2156         struct v4l2_ctrl_helper *helpers = helper;
2157         unsigned i, j;
2158         int ret;
2159
2160         cs->error_idx = cs->count;
2161         cs->ctrl_class = V4L2_CTRL_ID2CLASS(cs->ctrl_class);
2162
2163         if (hdl == NULL)
2164                 return -EINVAL;
2165
2166         if (cs->count == 0)
2167                 return class_check(hdl, cs->ctrl_class);
2168
2169         if (cs->count > ARRAY_SIZE(helper)) {
2170                 helpers = kmalloc(sizeof(helper[0]) * cs->count, GFP_KERNEL);
2171                 if (!helpers)
2172                         return -ENOMEM;
2173         }
2174         ret = prepare_ext_ctrls(hdl, cs, helpers);
2175         if (!ret)
2176                 ret = validate_ctrls(cs, helpers, set);
2177         if (ret && set)
2178                 cs->error_idx = cs->count;
2179         for (i = 0; !ret && i < cs->count; i++) {
2180                 struct v4l2_ctrl *master;
2181                 u32 idx = i;
2182
2183                 if (helpers[i].mref == NULL)
2184                         continue;
2185
2186                 cs->error_idx = i;
2187                 master = helpers[i].mref->ctrl;
2188                 v4l2_ctrl_lock(master);
2189
2190                 /* Reset the 'is_new' flags of the cluster */
2191                 for (j = 0; j < master->ncontrols; j++)
2192                         if (master->cluster[j])
2193                                 master->cluster[j]->is_new = 0;
2194
2195                 /* For volatile autoclusters that are currently in auto mode
2196                    we need to discover if it will be set to manual mode.
2197                    If so, then we have to copy the current volatile values
2198                    first since those will become the new manual values (which
2199                    may be overwritten by explicit new values from this set
2200                    of controls). */
2201                 if (master->is_auto && master->has_volatiles &&
2202                                                 !is_cur_manual(master)) {
2203                         /* Pick an initial non-manual value */
2204                         s32 new_auto_val = master->manual_mode_value + 1;
2205                         u32 tmp_idx = idx;
2206
2207                         do {
2208                                 /* Check if the auto control is part of the
2209                                    list, and remember the new value. */
2210                                 if (helpers[tmp_idx].ctrl == master)
2211                                         new_auto_val = cs->controls[tmp_idx].value;
2212                                 tmp_idx = helpers[tmp_idx].next;
2213                         } while (tmp_idx);
2214                         /* If the new value == the manual value, then copy
2215                            the current volatile values. */
2216                         if (new_auto_val == master->manual_mode_value)
2217                                 update_from_auto_cluster(master);
2218                 }
2219
2220                 /* Copy the new caller-supplied control values.
2221                    user_to_new() sets 'is_new' to 1. */
2222                 do {
2223                         ret = user_to_new(cs->controls + idx, helpers[idx].ctrl);
2224                         idx = helpers[idx].next;
2225                 } while (!ret && idx);
2226
2227                 if (!ret)
2228                         ret = try_or_set_cluster(fh, master, set);
2229
2230                 /* Copy the new values back to userspace. */
2231                 if (!ret) {
2232                         idx = i;
2233                         do {
2234                                 ret = new_to_user(cs->controls + idx,
2235                                                 helpers[idx].ctrl);
2236                                 idx = helpers[idx].next;
2237                         } while (!ret && idx);
2238                 }
2239                 v4l2_ctrl_unlock(master);
2240         }
2241
2242         if (cs->count > ARRAY_SIZE(helper))
2243                 kfree(helpers);
2244         return ret;
2245 }
2246
2247 int v4l2_try_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *cs)
2248 {
2249         return try_set_ext_ctrls(NULL, hdl, cs, false);
2250 }
2251 EXPORT_SYMBOL(v4l2_try_ext_ctrls);
2252
2253 int v4l2_s_ext_ctrls(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
2254                                         struct v4l2_ext_controls *cs)
2255 {
2256         return try_set_ext_ctrls(fh, hdl, cs, true);
2257 }
2258 EXPORT_SYMBOL(v4l2_s_ext_ctrls);
2259
2260 int v4l2_subdev_try_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs)
2261 {
2262         return try_set_ext_ctrls(NULL, sd->ctrl_handler, cs, false);
2263 }
2264 EXPORT_SYMBOL(v4l2_subdev_try_ext_ctrls);
2265
2266 int v4l2_subdev_s_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs)
2267 {
2268         return try_set_ext_ctrls(NULL, sd->ctrl_handler, cs, true);
2269 }
2270 EXPORT_SYMBOL(v4l2_subdev_s_ext_ctrls);
2271
2272 /* Helper function for VIDIOC_S_CTRL compatibility */
2273 static int set_ctrl(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, s32 *val)
2274 {
2275         struct v4l2_ctrl *master = ctrl->cluster[0];
2276         int ret;
2277         int i;
2278
2279         ret = validate_new_int(ctrl, val);
2280         if (ret)
2281                 return ret;
2282
2283         v4l2_ctrl_lock(ctrl);
2284
2285         /* Reset the 'is_new' flags of the cluster */
2286         for (i = 0; i < master->ncontrols; i++)
2287                 if (master->cluster[i])
2288                         master->cluster[i]->is_new = 0;
2289
2290         /* For autoclusters with volatiles that are switched from auto to
2291            manual mode we have to update the current volatile values since
2292            those will become the initial manual values after such a switch. */
2293         if (master->is_auto && master->has_volatiles && ctrl == master &&
2294             !is_cur_manual(master) && *val == master->manual_mode_value)
2295                 update_from_auto_cluster(master);
2296         ctrl->val = *val;
2297         ctrl->is_new = 1;
2298         ret = try_or_set_cluster(fh, master, true);
2299         *val = ctrl->cur.val;
2300         v4l2_ctrl_unlock(ctrl);
2301         return ret;
2302 }
2303
2304 int v4l2_s_ctrl(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
2305                                         struct v4l2_control *control)
2306 {
2307         struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, control->id);
2308
2309         if (ctrl == NULL || !type_is_int(ctrl))
2310                 return -EINVAL;
2311
2312         if (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY)
2313                 return -EACCES;
2314
2315         return set_ctrl(fh, ctrl, &control->value);
2316 }
2317 EXPORT_SYMBOL(v4l2_s_ctrl);
2318
2319 int v4l2_subdev_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *control)
2320 {
2321         return v4l2_s_ctrl(NULL, sd->ctrl_handler, control);
2322 }
2323 EXPORT_SYMBOL(v4l2_subdev_s_ctrl);
2324
2325 int v4l2_ctrl_s_ctrl(struct v4l2_ctrl *ctrl, s32 val)
2326 {
2327         /* It's a driver bug if this happens. */
2328         WARN_ON(!type_is_int(ctrl));
2329         return set_ctrl(NULL, ctrl, &val);
2330 }
2331 EXPORT_SYMBOL(v4l2_ctrl_s_ctrl);
2332
2333 void v4l2_ctrl_add_event(struct v4l2_ctrl *ctrl,
2334                                 struct v4l2_subscribed_event *sev)
2335 {
2336         v4l2_ctrl_lock(ctrl);
2337         list_add_tail(&sev->node, &ctrl->ev_subs);
2338         if (ctrl->type != V4L2_CTRL_TYPE_CTRL_CLASS &&
2339             (sev->flags & V4L2_EVENT_SUB_FL_SEND_INITIAL)) {
2340                 struct v4l2_event ev;
2341                 u32 changes = V4L2_EVENT_CTRL_CH_FLAGS;
2342
2343                 if (!(ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY))
2344                         changes |= V4L2_EVENT_CTRL_CH_VALUE;
2345                 fill_event(&ev, ctrl, changes);
2346                 v4l2_event_queue_fh(sev->fh, &ev);
2347         }
2348         v4l2_ctrl_unlock(ctrl);
2349 }
2350 EXPORT_SYMBOL(v4l2_ctrl_add_event);
2351
2352 void v4l2_ctrl_del_event(struct v4l2_ctrl *ctrl,
2353                                 struct v4l2_subscribed_event *sev)
2354 {
2355         v4l2_ctrl_lock(ctrl);
2356         list_del(&sev->node);
2357         v4l2_ctrl_unlock(ctrl);
2358 }
2359 EXPORT_SYMBOL(v4l2_ctrl_del_event);