drivers/media/video/uvc/uvcvideo.h

   1 #ifndef _USB_VIDEO_H_
   2 #define _USB_VIDEO_H_
   3
   4 #ifndef __KERNEL__
   5 #error "The uvcvideo.h header is deprecated, use linux/uvcvideo.h instead."
   6 #endif /* __KERNEL__ */
   7
   8 #include <linux/kernel.h>
   9 #include <linux/poll.h>
  10 #include <linux/usb.h>
  11 #include <linux/usb/video.h>
  12 #include <linux/uvcvideo.h>
  13 #include <linux/videodev2.h>
  14 #include <media/media-device.h>
  15 #include <media/v4l2-device.h>
  16 #include <media/videobuf2-core.h>
  17
  18 /* --------------------------------------------------------------------------
  19  * UVC constants
  20  */
  21
  22 #define UVC_TERM_INPUT                  0x0000
  23 #define UVC_TERM_OUTPUT                 0x8000
  24 #define UVC_TERM_DIRECTION(term)        ((term)->type & 0x8000)
  25
  26 #define UVC_ENTITY_TYPE(entity)         ((entity)->type & 0x7fff)
  27 #define UVC_ENTITY_IS_UNIT(entity)      (((entity)->type & 0xff00) == 0)
  28 #define UVC_ENTITY_IS_TERM(entity)      (((entity)->type & 0xff00) != 0)
  29 #define UVC_ENTITY_IS_ITERM(entity) \
  30         (UVC_ENTITY_IS_TERM(entity) && \
  31         ((entity)->type & 0x8000) == UVC_TERM_INPUT)
  32 #define UVC_ENTITY_IS_OTERM(entity) \
  33         (UVC_ENTITY_IS_TERM(entity) && \
  34         ((entity)->type & 0x8000) == UVC_TERM_OUTPUT)
  35
  36
  37 /* ------------------------------------------------------------------------
  38  * GUIDs
  39  */
  40 #define UVC_GUID_UVC_CAMERA \
  41         {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, \
  42          0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01}
  43 #define UVC_GUID_UVC_OUTPUT \
  44         {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, \
  45          0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02}
  46 #define UVC_GUID_UVC_MEDIA_TRANSPORT_INPUT \
  47         {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, \
  48          0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x03}
  49 #define UVC_GUID_UVC_PROCESSING \
  50         {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, \
  51          0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x01}
  52 #define UVC_GUID_UVC_SELECTOR \
  53         {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, \
  54          0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x02}
  55
  56 #define UVC_GUID_FORMAT_MJPEG \
  57         { 'M',  'J',  'P',  'G', 0x00, 0x00, 0x10, 0x00, \
  58          0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
  59 #define UVC_GUID_FORMAT_YUY2 \
  60         { 'Y',  'U',  'Y',  '2', 0x00, 0x00, 0x10, 0x00, \
  61          0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
  62 #define UVC_GUID_FORMAT_YUY2_ISIGHT \
  63         { 'Y',  'U',  'Y',  '2', 0x00, 0x00, 0x10, 0x00, \
  64          0x80, 0x00, 0x00, 0x00, 0x00, 0x38, 0x9b, 0x71}
  65 #define UVC_GUID_FORMAT_NV12 \
  66         { 'N',  'V',  '1',  '2', 0x00, 0x00, 0x10, 0x00, \
  67          0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
  68 #define UVC_GUID_FORMAT_YV12 \
  69         { 'Y',  'V',  '1',  '2', 0x00, 0x00, 0x10, 0x00, \
  70          0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
  71 #define UVC_GUID_FORMAT_I420 \
  72         { 'I',  '4',  '2',  '0', 0x00, 0x00, 0x10, 0x00, \
  73          0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
  74 #define UVC_GUID_FORMAT_UYVY \
  75         { 'U',  'Y',  'V',  'Y', 0x00, 0x00, 0x10, 0x00, \
  76          0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
  77 #define UVC_GUID_FORMAT_Y800 \
  78         { 'Y',  '8',  '0',  '0', 0x00, 0x00, 0x10, 0x00, \
  79          0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
  80 #define UVC_GUID_FORMAT_Y16 \
  81         { 'Y',  '1',  '6',  ' ', 0x00, 0x00, 0x10, 0x00, \
  82          0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
  83 #define UVC_GUID_FORMAT_BY8 \
  84         { 'B',  'Y',  '8',  ' ', 0x00, 0x00, 0x10, 0x00, \
  85          0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
  86 #define UVC_GUID_FORMAT_RGBP \
  87         { 'R',  'G',  'B',  'P', 0x00, 0x00, 0x10, 0x00, \
  88          0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
  89 #define UVC_GUID_FORMAT_M420 \
  90         { 'M',  '4',  '2',  '0', 0x00, 0x00, 0x10, 0x00, \
  91          0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
  92
  93 #define UVC_GUID_FORMAT_H264 \
  94         { 'H',  '2',  '6',  '4', 0x00, 0x00, 0x10, 0x00, \
  95          0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
  96
  97 /* ------------------------------------------------------------------------
  98  * Driver specific constants.
  99  */
 100
 101 #define DRIVER_VERSION          "1.1.1"
 102
 103 /* Number of isochronous URBs. */
 104 #define UVC_URBS                5
 105 /* Maximum number of packets per URB. */
 106 #define UVC_MAX_PACKETS         32
 107 /* Maximum number of video buffers. */
 108 #define UVC_MAX_VIDEO_BUFFERS   32
 109 /* Maximum status buffer size in bytes of interrupt URB. */
 110 #define UVC_MAX_STATUS_SIZE     16
 111
 112 #define UVC_CTRL_CONTROL_TIMEOUT        300
 113 #define UVC_CTRL_STREAMING_TIMEOUT      5000
 114
 115 /* Maximum allowed number of control mappings per device */
 116 #define UVC_MAX_CONTROL_MAPPINGS        1024
 117 #define UVC_MAX_CONTROL_MENU_ENTRIES    32
 118
 119 /* Devices quirks */
 120 #define UVC_QUIRK_STATUS_INTERVAL       0x00000001
 121 #define UVC_QUIRK_PROBE_MINMAX          0x00000002
 122 #define UVC_QUIRK_PROBE_EXTRAFIELDS     0x00000004
 123 #define UVC_QUIRK_BUILTIN_ISIGHT        0x00000008
 124 #define UVC_QUIRK_STREAM_NO_FID         0x00000010
 125 #define UVC_QUIRK_IGNORE_SELECTOR_UNIT  0x00000020
 126 #define UVC_QUIRK_FIX_BANDWIDTH         0x00000080
 127 #define UVC_QUIRK_PROBE_DEF             0x00000100
 128 #define UVC_QUIRK_RESTRICT_FRAME_RATE   0x00000200
 129
 130 /* Format flags */
 131 #define UVC_FMT_FLAG_COMPRESSED         0x00000001
 132 #define UVC_FMT_FLAG_STREAM             0x00000002
 133
 134 /* ------------------------------------------------------------------------
 135  * Structures.
 136  */
 137
 138 struct uvc_device;
 139
 140 /* TODO: Put the most frequently accessed fields at the beginning of
 141  * structures to maximize cache efficiency.
 142  */
 143 struct uvc_control_info {
 144         struct list_head mappings;
 145
 146         __u8 entity[16];
 147         __u8 index;     /* Bit index in bmControls */
 148         __u8 selector;
 149
 150         __u16 size;
 151         __u32 flags;
 152 };
 153
 154 struct uvc_control_mapping {
 155         struct list_head list;
 156
 157         struct uvc_control_info *ctrl;
 158
 159         __u32 id;
 160         __u8 name[32];
 161         __u8 entity[16];
 162         __u8 selector;
 163
 164         __u8 size;
 165         __u8 offset;
 166         enum v4l2_ctrl_type v4l2_type;
 167         __u32 data_type;
 168
 169         struct uvc_menu_info *menu_info;
 170         __u32 menu_count;
 171
 172         __s32 (*get) (struct uvc_control_mapping *mapping, __u8 query,
 173                       const __u8 *data);
 174         void (*set) (struct uvc_control_mapping *mapping, __s32 value,
 175                      __u8 *data);
 176 };
 177
 178 struct uvc_control {
 179         struct uvc_entity *entity;
 180         struct uvc_control_info info;
 181
 182         __u8 index;     /* Used to match the uvc_control entry with a
 183                            uvc_control_info. */
 184         __u8 dirty:1,
 185              loaded:1,
 186              modified:1,
 187              cached:1,
 188              initialized:1;
 189
 190         __u8 *uvc_data;
 191 };
 192
 193 struct uvc_format_desc {
 194         char *name;
 195         __u8 guid[16];
 196         __u32 fcc;
 197 };
 198
 199 /* The term 'entity' refers to both UVC units and UVC terminals.
 200  *
 201  * The type field is either the terminal type (wTerminalType in the terminal
 202  * descriptor), or the unit type (bDescriptorSubtype in the unit descriptor).
 203  * As the bDescriptorSubtype field is one byte long, the type value will
 204  * always have a null MSB for units. All terminal types defined by the UVC
 205  * specification have a non-null MSB, so it is safe to use the MSB to
 206  * differentiate between units and terminals as long as the descriptor parsing
 207  * code makes sure terminal types have a non-null MSB.
 208  *
 209  * For terminals, the type's most significant bit stores the terminal
 210  * direction (either UVC_TERM_INPUT or UVC_TERM_OUTPUT). The type field should
 211  * always be accessed with the UVC_ENTITY_* macros and never directly.
 212  */
 213
 214 struct uvc_entity {
 215         struct list_head list;          /* Entity as part of a UVC device. */
 216         struct list_head chain;         /* Entity as part of a video device
 217                                          * chain. */
 218         __u8 id;
 219         __u16 type;
 220         char name[64];
 221
 222         /* Media controller-related fields. */
 223         struct video_device *vdev;
 224         struct v4l2_subdev subdev;
 225         unsigned int num_pads;
 226         unsigned int num_links;
 227         struct media_pad *pads;
 228
 229         union {
 230                 struct {
 231                         __u16 wObjectiveFocalLengthMin;
 232                         __u16 wObjectiveFocalLengthMax;
 233                         __u16 wOcularFocalLength;
 234                         __u8  bControlSize;
 235                         __u8  *bmControls;
 236                 } camera;
 237
 238                 struct {
 239                         __u8  bControlSize;
 240                         __u8  *bmControls;
 241                         __u8  bTransportModeSize;
 242                         __u8  *bmTransportModes;
 243                 } media;
 244
 245                 struct {
 246                 } output;
 247
 248                 struct {
 249                         __u16 wMaxMultiplier;
 250                         __u8  bControlSize;
 251                         __u8  *bmControls;
 252                         __u8  bmVideoStandards;
 253                 } processing;
 254
 255                 struct {
 256                 } selector;
 257
 258                 struct {
 259                         __u8  guidExtensionCode[16];
 260                         __u8  bNumControls;
 261                         __u8  bControlSize;
 262                         __u8  *bmControls;
 263                         __u8  *bmControlsType;
 264                 } extension;
 265         };
 266
 267         __u8 bNrInPins;
 268         __u8 *baSourceID;
 269
 270         unsigned int ncontrols;
 271         struct uvc_control *controls;
 272 };
 273
 274 struct uvc_frame {
 275         __u8  bFrameIndex;
 276         __u8  bmCapabilities;
 277         __u16 wWidth;
 278         __u16 wHeight;
 279         __u32 dwMinBitRate;
 280         __u32 dwMaxBitRate;
 281         __u32 dwMaxVideoFrameBufferSize;
 282         __u8  bFrameIntervalType;
 283         __u32 dwDefaultFrameInterval;
 284         __u32 *dwFrameInterval;
 285 };
 286
 287 struct uvc_format {
 288         __u8 type;
 289         __u8 index;
 290         __u8 bpp;
 291         __u8 colorspace;
 292         __u32 fcc;
 293         __u32 flags;
 294
 295         char name[32];
 296
 297         unsigned int nframes;
 298         struct uvc_frame *frame;
 299 };
 300
 301 struct uvc_streaming_header {
 302         __u8 bNumFormats;
 303         __u8 bEndpointAddress;
 304         __u8 bTerminalLink;
 305         __u8 bControlSize;
 306         __u8 *bmaControls;
 307         /* The following fields are used by input headers only. */
 308         __u8 bmInfo;
 309         __u8 bStillCaptureMethod;
 310         __u8 bTriggerSupport;
 311         __u8 bTriggerUsage;
 312 };
 313
 314 enum uvc_buffer_state {
 315         UVC_BUF_STATE_IDLE      = 0,
 316         UVC_BUF_STATE_QUEUED    = 1,
 317         UVC_BUF_STATE_ACTIVE    = 2,
 318         UVC_BUF_STATE_READY     = 3,
 319         UVC_BUF_STATE_DONE      = 4,
 320         UVC_BUF_STATE_ERROR     = 5,
 321 };
 322
 323 struct uvc_buffer {
 324         struct vb2_buffer buf;
 325         struct list_head queue;
 326
 327         enum uvc_buffer_state state;
 328         unsigned int error;
 329
 330         void *mem;
 331         unsigned int length;
 332         unsigned int bytesused;
 333
 334         u32 pts;
 335 };
 336
 337 #define UVC_QUEUE_DISCONNECTED          (1 << 0)
 338 #define UVC_QUEUE_DROP_CORRUPTED        (1 << 1)
 339
 340 struct uvc_video_queue {
 341         struct vb2_queue queue;
 342         struct mutex mutex;                     /* Protects queue */
 343
 344         unsigned int flags;
 345         unsigned int buf_used;
 346
 347         spinlock_t irqlock;                     /* Protects irqqueue */
 348         struct list_head irqqueue;
 349 };
 350
 351 struct uvc_video_chain {
 352         struct uvc_device *dev;
 353         struct list_head list;
 354
 355         struct list_head entities;              /* All entities */
 356         struct uvc_entity *processing;          /* Processing unit */
 357         struct uvc_entity *selector;            /* Selector unit */
 358
 359         struct mutex ctrl_mutex;                /* Protects ctrl.info */
 360 };
 361
 362 struct uvc_stats_frame {
 363         unsigned int size;              /* Number of bytes captured */
 364         unsigned int first_data;        /* Index of the first non-empty packet */
 365
 366         unsigned int nb_packets;        /* Number of packets */
 367         unsigned int nb_empty;          /* Number of empty packets */
 368         unsigned int nb_invalid;        /* Number of packets with an invalid header */
 369         unsigned int nb_errors;         /* Number of packets with the error bit set */
 370
 371         unsigned int nb_pts;            /* Number of packets with a PTS timestamp */
 372         unsigned int nb_pts_diffs;      /* Number of PTS differences inside a frame */
 373         unsigned int last_pts_diff;     /* Index of the last PTS difference */
 374         bool has_initial_pts;           /* Whether the first non-empty packet has a PTS */
 375         bool has_early_pts;             /* Whether a PTS is present before the first non-empty packet */
 376         u32 pts;                        /* PTS of the last packet */
 377
 378         unsigned int nb_scr;            /* Number of packets with a SCR timestamp */
 379         unsigned int nb_scr_diffs;      /* Number of SCR.STC differences inside a frame */
 380         u16 scr_sof;                    /* SCR.SOF of the last packet */
 381         u32 scr_stc;                    /* SCR.STC of the last packet */
 382 };
 383
 384 struct uvc_stats_stream {
 385         struct timespec start_ts;       /* Stream start timestamp */
 386         struct timespec stop_ts;        /* Stream stop timestamp */
 387
 388         unsigned int nb_frames;         /* Number of frames */
 389
 390         unsigned int nb_packets;        /* Number of packets */
 391         unsigned int nb_empty;          /* Number of empty packets */
 392         unsigned int nb_invalid;        /* Number of packets with an invalid header */
 393         unsigned int nb_errors;         /* Number of packets with the error bit set */
 394
 395         unsigned int nb_pts_constant;   /* Number of frames with constant PTS */
 396         unsigned int nb_pts_early;      /* Number of frames with early PTS */
 397         unsigned int nb_pts_initial;    /* Number of frames with initial PTS */
 398
 399         unsigned int nb_scr_count_ok;   /* Number of frames with at least one SCR per non empty packet */
 400         unsigned int nb_scr_diffs_ok;   /* Number of frames with varying SCR.STC */
 401         unsigned int scr_sof_count;     /* STC.SOF counter accumulated since stream start */
 402         unsigned int scr_sof;           /* STC.SOF of the last packet */
 403         unsigned int min_sof;           /* Minimum STC.SOF value */
 404         unsigned int max_sof;           /* Maximum STC.SOF value */
 405 };
 406
 407 struct uvc_streaming {
 408         struct list_head list;
 409         struct uvc_device *dev;
 410         struct video_device *vdev;
 411         struct uvc_video_chain *chain;
 412         atomic_t active;
 413
 414         struct usb_interface *intf;
 415         int intfnum;
 416         __u16 maxpsize;
 417
 418         struct uvc_streaming_header header;
 419         enum v4l2_buf_type type;
 420
 421         unsigned int nformats;
 422         struct uvc_format *format;
 423
 424         struct uvc_streaming_control ctrl;
 425         struct uvc_format *cur_format;
 426         struct uvc_frame *cur_frame;
 427         /* Protect access to ctrl, cur_format, cur_frame and hardware video
 428          * probe control.
 429          */
 430         struct mutex mutex;
 431
 432         /* Buffers queue. */
 433         unsigned int frozen : 1;
 434         struct uvc_video_queue queue;
 435         void (*decode) (struct urb *urb, struct uvc_streaming *video,
 436                         struct uvc_buffer *buf);
 437
 438         /* Context data used by the bulk completion handler. */
 439         struct {
 440                 __u8 header[256];
 441                 unsigned int header_size;
 442                 int skip_payload;
 443                 __u32 payload_size;
 444                 __u32 max_payload_size;
 445         } bulk;
 446
 447         struct urb *urb[UVC_URBS];
 448         char *urb_buffer[UVC_URBS];
 449         dma_addr_t urb_dma[UVC_URBS];
 450         unsigned int urb_size;
 451
 452         __u32 sequence;
 453         __u8 last_fid;
 454
 455         /* debugfs */
 456         struct dentry *debugfs_dir;
 457         struct {
 458                 struct uvc_stats_frame frame;
 459                 struct uvc_stats_stream stream;
 460         } stats;
 461
 462         /* Timestamps support. */
 463         struct uvc_clock {
 464                 struct uvc_clock_sample {
 465                         u32 dev_stc;
 466                         u16 dev_sof;
 467                         struct timespec host_ts;
 468                         u16 host_sof;
 469                 } *samples;
 470
 471                 unsigned int head;
 472                 unsigned int count;
 473                 unsigned int size;
 474
 475                 u16 last_sof;
 476                 u16 sof_offset;
 477
 478                 spinlock_t lock;
 479         } clock;
 480 };
 481
 482 enum uvc_device_state {
 483         UVC_DEV_DISCONNECTED = 1,
 484 };
 485
 486 struct uvc_device {
 487         struct usb_device *udev;
 488         struct usb_interface *intf;
 489         unsigned long warnings;
 490         __u32 quirks;
 491         int intfnum;
 492         char name[32];
 493
 494         enum uvc_device_state state;
 495         atomic_t users;
 496         atomic_t nmappings;
 497
 498         /* Video control interface */
 499 #ifdef CONFIG_MEDIA_CONTROLLER
 500         struct media_device mdev;
 501 #endif
 502         struct v4l2_device vdev;
 503         __u16 uvc_version;
 504         __u32 clock_frequency;
 505
 506         struct list_head entities;
 507         struct list_head chains;
 508
 509         /* Video Streaming interfaces */
 510         struct list_head streams;
 511         atomic_t nstreams;
 512
 513         /* Status Interrupt Endpoint */
 514         struct usb_host_endpoint *int_ep;
 515         struct urb *int_urb;
 516         __u8 *status;
 517         struct input_dev *input;
 518         char input_phys[64];
 519 };
 520
 521 enum uvc_handle_state {
 522         UVC_HANDLE_PASSIVE      = 0,
 523         UVC_HANDLE_ACTIVE       = 1,
 524 };
 525
 526 struct uvc_fh {
 527         struct uvc_video_chain *chain;
 528         struct uvc_streaming *stream;
 529         enum uvc_handle_state state;
 530 };
 531
 532 struct uvc_driver {
 533         struct usb_driver driver;
 534 };
 535
 536 /* ------------------------------------------------------------------------
 537  * Debugging, printing and logging
 538  */
 539
 540 #define UVC_TRACE_PROBE         (1 << 0)
 541 #define UVC_TRACE_DESCR         (1 << 1)
 542 #define UVC_TRACE_CONTROL       (1 << 2)
 543 #define UVC_TRACE_FORMAT        (1 << 3)
 544 #define UVC_TRACE_CAPTURE       (1 << 4)
 545 #define UVC_TRACE_CALLS         (1 << 5)
 546 #define UVC_TRACE_IOCTL         (1 << 6)
 547 #define UVC_TRACE_FRAME         (1 << 7)
 548 #define UVC_TRACE_SUSPEND       (1 << 8)
 549 #define UVC_TRACE_STATUS        (1 << 9)
 550 #define UVC_TRACE_VIDEO         (1 << 10)
 551 #define UVC_TRACE_STATS         (1 << 11)
 552 #define UVC_TRACE_CLOCK         (1 << 12)
 553
 554 #define UVC_WARN_MINMAX         0
 555 #define UVC_WARN_PROBE_DEF      1
 556 #define UVC_WARN_XU_GET_RES     2
 557
 558 extern unsigned int uvc_clock_param;
 559 extern unsigned int uvc_no_drop_param;
 560 extern unsigned int uvc_trace_param;
 561 extern unsigned int uvc_timeout_param;
 562
 563 #define uvc_trace(flag, msg...) \
 564         do { \
 565                 if (uvc_trace_param & flag) \
 566                         printk(KERN_DEBUG "uvcvideo: " msg); \
 567         } while (0)
 568
 569 #define uvc_warn_once(dev, warn, msg...) \
 570         do { \
 571                 if (!test_and_set_bit(warn, &dev->warnings)) \
 572                         printk(KERN_INFO "uvcvideo: " msg); \
 573         } while (0)
 574
 575 #define uvc_printk(level, msg...) \
 576         printk(level "uvcvideo: " msg)
 577
 578 /* --------------------------------------------------------------------------
 579  * Internal functions.
 580  */
 581
 582 /* Core driver */
 583 extern struct uvc_driver uvc_driver;
 584
 585 extern struct uvc_entity *uvc_entity_by_id(struct uvc_device *dev, int id);
 586
 587 /* Video buffers queue management. */
 588 extern void uvc_queue_init(struct uvc_video_queue *queue,
 589                 enum v4l2_buf_type type, int drop_corrupted);
 590 extern int uvc_alloc_buffers(struct uvc_video_queue *queue,
 591                 struct v4l2_requestbuffers *rb);
 592 extern void uvc_free_buffers(struct uvc_video_queue *queue);
 593 extern int uvc_query_buffer(struct uvc_video_queue *queue,
 594                 struct v4l2_buffer *v4l2_buf);
 595 extern int uvc_queue_buffer(struct uvc_video_queue *queue,
 596                 struct v4l2_buffer *v4l2_buf);
 597 extern int uvc_dequeue_buffer(struct uvc_video_queue *queue,
 598                 struct v4l2_buffer *v4l2_buf, int nonblocking);
 599 extern int uvc_queue_enable(struct uvc_video_queue *queue, int enable);
 600 extern void uvc_queue_cancel(struct uvc_video_queue *queue, int disconnect);
 601 extern struct uvc_buffer *uvc_queue_next_buffer(struct uvc_video_queue *queue,
 602                 struct uvc_buffer *buf);
 603 extern int uvc_queue_mmap(struct uvc_video_queue *queue,
 604                 struct vm_area_struct *vma);
 605 extern unsigned int uvc_queue_poll(struct uvc_video_queue *queue,
 606                 struct file *file, poll_table *wait);
 607 #ifndef CONFIG_MMU
 608 extern unsigned long uvc_queue_get_unmapped_area(struct uvc_video_queue *queue,
 609                 unsigned long pgoff);
 610 #endif
 611 extern int uvc_queue_allocated(struct uvc_video_queue *queue);
 612 static inline int uvc_queue_streaming(struct uvc_video_queue *queue)
 613 {
 614         return vb2_is_streaming(&queue->queue);
 615 }
 616
 617 /* V4L2 interface */
 618 extern const struct v4l2_file_operations uvc_fops;
 619
 620 /* Media controller */
 621 extern int uvc_mc_register_entities(struct uvc_video_chain *chain);
 622 extern void uvc_mc_cleanup_entity(struct uvc_entity *entity);
 623
 624 /* Video */
 625 extern int uvc_video_init(struct uvc_streaming *stream);
 626 extern int uvc_video_suspend(struct uvc_streaming *stream);
 627 extern int uvc_video_resume(struct uvc_streaming *stream, int reset);
 628 extern int uvc_video_enable(struct uvc_streaming *stream, int enable);
 629 extern int uvc_probe_video(struct uvc_streaming *stream,
 630                 struct uvc_streaming_control *probe);
 631 extern int uvc_query_ctrl(struct uvc_device *dev, __u8 query, __u8 unit,
 632                 __u8 intfnum, __u8 cs, void *data, __u16 size);
 633 void uvc_video_clock_update(struct uvc_streaming *stream,
 634                             struct v4l2_buffer *v4l2_buf,
 635                             struct uvc_buffer *buf);
 636
 637 /* Status */
 638 extern int uvc_status_init(struct uvc_device *dev);
 639 extern void uvc_status_cleanup(struct uvc_device *dev);
 640 extern int uvc_status_start(struct uvc_device *dev);
 641 extern void uvc_status_stop(struct uvc_device *dev);
 642 extern int uvc_status_suspend(struct uvc_device *dev);
 643 extern int uvc_status_resume(struct uvc_device *dev);
 644
 645 /* Controls */
 646 extern int uvc_query_v4l2_ctrl(struct uvc_video_chain *chain,
 647                 struct v4l2_queryctrl *v4l2_ctrl);
 648 extern int uvc_query_v4l2_menu(struct uvc_video_chain *chain,
 649                 struct v4l2_querymenu *query_menu);
 650
 651 extern int uvc_ctrl_add_mapping(struct uvc_video_chain *chain,
 652                 const struct uvc_control_mapping *mapping);
 653 extern int uvc_ctrl_init_device(struct uvc_device *dev);
 654 extern void uvc_ctrl_cleanup_device(struct uvc_device *dev);
 655 extern int uvc_ctrl_resume_device(struct uvc_device *dev);
 656
 657 extern int uvc_ctrl_begin(struct uvc_video_chain *chain);
 658 extern int __uvc_ctrl_commit(struct uvc_video_chain *chain, int rollback);
 659 static inline int uvc_ctrl_commit(struct uvc_video_chain *chain)
 660 {
 661         return __uvc_ctrl_commit(chain, 0);
 662 }
 663 static inline int uvc_ctrl_rollback(struct uvc_video_chain *chain)
 664 {
 665         return __uvc_ctrl_commit(chain, 1);
 666 }
 667
 668 extern int uvc_ctrl_get(struct uvc_video_chain *chain,
 669                 struct v4l2_ext_control *xctrl);
 670 extern int uvc_ctrl_set(struct uvc_video_chain *chain,
 671                 struct v4l2_ext_control *xctrl);
 672
 673 extern int uvc_xu_ctrl_query(struct uvc_video_chain *chain,
 674                 struct uvc_xu_control_query *xqry);
 675
 676 /* Utility functions */
 677 extern void uvc_simplify_fraction(uint32_t *numerator, uint32_t *denominator,
 678                 unsigned int n_terms, unsigned int threshold);
 679 extern uint32_t uvc_fraction_to_interval(uint32_t numerator,
 680                 uint32_t denominator);
 681 extern struct usb_host_endpoint *uvc_find_endpoint(
 682                 struct usb_host_interface *alts, __u8 epaddr);
 683
 684 /* Quirks support */
 685 void uvc_video_decode_isight(struct urb *urb, struct uvc_streaming *stream,
 686                 struct uvc_buffer *buf);
 687
 688 /* debugfs and statistics */
 689 int uvc_debugfs_init(void);
 690 void uvc_debugfs_cleanup(void);
 691 int uvc_debugfs_init_stream(struct uvc_streaming *stream);
 692 void uvc_debugfs_cleanup_stream(struct uvc_streaming *stream);
 693
 694 size_t uvc_video_stats_dump(struct uvc_streaming *stream, char *buf,
 695                             size_t size);
 696
 697 #endif