drivers/media/video/uvc/uvcvideo.h

   1 #ifndef _USB_VIDEO_H_
   2 #define _USB_VIDEO_H_
   3
   4 #include <linux/kernel.h>
   5 #include <linux/videodev2.h>
   6
   7 #ifndef __KERNEL__
   8 /*
   9  * This header provides binary compatibility with applications using the private
  10  * uvcvideo API. This API is deprecated and will be removed in 2.6.42.
  11  * Applications should be recompiled against the public linux/uvcvideo.h header.
  12  */
  13 #warn "The uvcvideo.h header is deprecated, use linux/uvcvideo.h instead."
  14
  15 /*
  16  * Dynamic controls
  17  */
  18
  19 /* Data types for UVC control data */
  20 #define UVC_CTRL_DATA_TYPE_RAW          0
  21 #define UVC_CTRL_DATA_TYPE_SIGNED       1
  22 #define UVC_CTRL_DATA_TYPE_UNSIGNED     2
  23 #define UVC_CTRL_DATA_TYPE_BOOLEAN      3
  24 #define UVC_CTRL_DATA_TYPE_ENUM         4
  25 #define UVC_CTRL_DATA_TYPE_BITMASK      5
  26
  27 /* Control flags */
  28 #define UVC_CONTROL_SET_CUR     (1 << 0)
  29 #define UVC_CONTROL_GET_CUR     (1 << 1)
  30 #define UVC_CONTROL_GET_MIN     (1 << 2)
  31 #define UVC_CONTROL_GET_MAX     (1 << 3)
  32 #define UVC_CONTROL_GET_RES     (1 << 4)
  33 #define UVC_CONTROL_GET_DEF     (1 << 5)
  34 #define UVC_CONTROL_RESTORE     (1 << 6)
  35 #define UVC_CONTROL_AUTO_UPDATE (1 << 7)
  36
  37 #define UVC_CONTROL_GET_RANGE   (UVC_CONTROL_GET_CUR | UVC_CONTROL_GET_MIN | \
  38                                  UVC_CONTROL_GET_MAX | UVC_CONTROL_GET_RES | \
  39                                  UVC_CONTROL_GET_DEF)
  40
  41 struct uvc_menu_info {
  42         __u32 value;
  43         __u8 name[32];
  44 };
  45
  46 struct uvc_xu_control_mapping {
  47         __u32 id;
  48         __u8 name[32];
  49         __u8 entity[16];
  50         __u8 selector;
  51
  52         __u8 size;
  53         __u8 offset;
  54         __u32 v4l2_type;
  55         __u32 data_type;
  56
  57         struct uvc_menu_info __user *menu_info;
  58         __u32 menu_count;
  59
  60         __u32 reserved[4];
  61 };
  62
  63 #endif
  64
  65 struct uvc_xu_control_info {
  66         __u8 entity[16];
  67         __u8 index;
  68         __u8 selector;
  69         __u16 size;
  70         __u32 flags;
  71 };
  72
  73 struct uvc_xu_control_mapping_old {
  74         __u8 reserved[64];
  75 };
  76
  77 struct uvc_xu_control {
  78         __u8 unit;
  79         __u8 selector;
  80         __u16 size;
  81         __u8 __user *data;
  82 };
  83
  84 #ifndef __KERNEL__
  85 #define UVCIOC_CTRL_ADD         _IOW('U', 1, struct uvc_xu_control_info)
  86 #define UVCIOC_CTRL_MAP_OLD     _IOWR('U', 2, struct uvc_xu_control_mapping_old)
  87 #define UVCIOC_CTRL_MAP         _IOWR('U', 2, struct uvc_xu_control_mapping)
  88 #define UVCIOC_CTRL_GET         _IOWR('U', 3, struct uvc_xu_control)
  89 #define UVCIOC_CTRL_SET         _IOW('U', 4, struct uvc_xu_control)
  90 #else
  91 #define __UVCIOC_CTRL_ADD       _IOW('U', 1, struct uvc_xu_control_info)
  92 #define __UVCIOC_CTRL_MAP_OLD   _IOWR('U', 2, struct uvc_xu_control_mapping_old)
  93 #define __UVCIOC_CTRL_MAP       _IOWR('U', 2, struct uvc_xu_control_mapping)
  94 #define __UVCIOC_CTRL_GET       _IOWR('U', 3, struct uvc_xu_control)
  95 #define __UVCIOC_CTRL_SET       _IOW('U', 4, struct uvc_xu_control)
  96 #endif
  97
  98 #ifdef __KERNEL__
  99
 100 #include <linux/poll.h>
 101 #include <linux/usb/video.h>
 102 #include <linux/uvcvideo.h>
 103
 104 /* --------------------------------------------------------------------------
 105  * UVC constants
 106  */
 107
 108 #define UVC_TERM_INPUT                  0x0000
 109 #define UVC_TERM_OUTPUT                 0x8000
 110 #define UVC_TERM_DIRECTION(term)        ((term)->type & 0x8000)
 111
 112 #define UVC_ENTITY_TYPE(entity)         ((entity)->type & 0x7fff)
 113 #define UVC_ENTITY_IS_UNIT(entity)      (((entity)->type & 0xff00) == 0)
 114 #define UVC_ENTITY_IS_TERM(entity)      (((entity)->type & 0xff00) != 0)
 115 #define UVC_ENTITY_IS_ITERM(entity) \
 116         (UVC_ENTITY_IS_TERM(entity) && \
 117         ((entity)->type & 0x8000) == UVC_TERM_INPUT)
 118 #define UVC_ENTITY_IS_OTERM(entity) \
 119         (UVC_ENTITY_IS_TERM(entity) && \
 120         ((entity)->type & 0x8000) == UVC_TERM_OUTPUT)
 121
 122
 123 /* ------------------------------------------------------------------------
 124  * GUIDs
 125  */
 126 #define UVC_GUID_UVC_CAMERA \
 127         {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, \
 128          0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01}
 129 #define UVC_GUID_UVC_OUTPUT \
 130         {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, \
 131          0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02}
 132 #define UVC_GUID_UVC_MEDIA_TRANSPORT_INPUT \
 133         {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, \
 134          0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x03}
 135 #define UVC_GUID_UVC_PROCESSING \
 136         {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, \
 137          0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x01}
 138 #define UVC_GUID_UVC_SELECTOR \
 139         {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, \
 140          0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x02}
 141
 142 #define UVC_GUID_FORMAT_MJPEG \
 143         { 'M',  'J',  'P',  'G', 0x00, 0x00, 0x10, 0x00, \
 144          0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
 145 #define UVC_GUID_FORMAT_YUY2 \
 146         { 'Y',  'U',  'Y',  '2', 0x00, 0x00, 0x10, 0x00, \
 147          0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
 148 #define UVC_GUID_FORMAT_YUY2_ISIGHT \
 149         { 'Y',  'U',  'Y',  '2', 0x00, 0x00, 0x10, 0x00, \
 150          0x80, 0x00, 0x00, 0x00, 0x00, 0x38, 0x9b, 0x71}
 151 #define UVC_GUID_FORMAT_NV12 \
 152         { 'N',  'V',  '1',  '2', 0x00, 0x00, 0x10, 0x00, \
 153          0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
 154 #define UVC_GUID_FORMAT_YV12 \
 155         { 'Y',  'V',  '1',  '2', 0x00, 0x00, 0x10, 0x00, \
 156          0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
 157 #define UVC_GUID_FORMAT_I420 \
 158         { 'I',  '4',  '2',  '0', 0x00, 0x00, 0x10, 0x00, \
 159          0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
 160 #define UVC_GUID_FORMAT_UYVY \
 161         { 'U',  'Y',  'V',  'Y', 0x00, 0x00, 0x10, 0x00, \
 162          0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
 163 #define UVC_GUID_FORMAT_Y800 \
 164         { 'Y',  '8',  '0',  '0', 0x00, 0x00, 0x10, 0x00, \
 165          0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
 166 #define UVC_GUID_FORMAT_Y16 \
 167         { 'Y',  '1',  '6',  ' ', 0x00, 0x00, 0x10, 0x00, \
 168          0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
 169 #define UVC_GUID_FORMAT_BY8 \
 170         { 'B',  'Y',  '8',  ' ', 0x00, 0x00, 0x10, 0x00, \
 171          0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
 172 #define UVC_GUID_FORMAT_RGBP \
 173         { 'R',  'G',  'B',  'P', 0x00, 0x00, 0x10, 0x00, \
 174          0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
 175 #define UVC_GUID_FORMAT_M420 \
 176         { 'M',  '4',  '2',  '0', 0x00, 0x00, 0x10, 0x00, \
 177          0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
 178
 179 /* ------------------------------------------------------------------------
 180  * Driver specific constants.
 181  */
 182
 183 #define DRIVER_VERSION_NUMBER   KERNEL_VERSION(1, 1, 0)
 184 #define DRIVER_VERSION          "v1.1.0"
 185
 186 /* Number of isochronous URBs. */
 187 #define UVC_URBS                5
 188 /* Maximum number of packets per URB. */
 189 #define UVC_MAX_PACKETS         32
 190 /* Maximum number of video buffers. */
 191 #define UVC_MAX_VIDEO_BUFFERS   32
 192 /* Maximum status buffer size in bytes of interrupt URB. */
 193 #define UVC_MAX_STATUS_SIZE     16
 194
 195 #define UVC_CTRL_CONTROL_TIMEOUT        300
 196 #define UVC_CTRL_STREAMING_TIMEOUT      5000
 197
 198 /* Maximum allowed number of control mappings per device */
 199 #define UVC_MAX_CONTROL_MAPPINGS        1024
 200
 201 /* Devices quirks */
 202 #define UVC_QUIRK_STATUS_INTERVAL       0x00000001
 203 #define UVC_QUIRK_PROBE_MINMAX          0x00000002
 204 #define UVC_QUIRK_PROBE_EXTRAFIELDS     0x00000004
 205 #define UVC_QUIRK_BUILTIN_ISIGHT        0x00000008
 206 #define UVC_QUIRK_STREAM_NO_FID         0x00000010
 207 #define UVC_QUIRK_IGNORE_SELECTOR_UNIT  0x00000020
 208 #define UVC_QUIRK_FIX_BANDWIDTH         0x00000080
 209 #define UVC_QUIRK_PROBE_DEF             0x00000100
 210 #define UVC_QUIRK_RESTRICT_FRAME_RATE   0x00000200
 211
 212 /* Format flags */
 213 #define UVC_FMT_FLAG_COMPRESSED         0x00000001
 214 #define UVC_FMT_FLAG_STREAM             0x00000002
 215
 216 /* ------------------------------------------------------------------------
 217  * Structures.
 218  */
 219
 220 struct uvc_device;
 221
 222 /* TODO: Put the most frequently accessed fields at the beginning of
 223  * structures to maximize cache efficiency.
 224  */
 225 struct uvc_control_info {
 226         struct list_head mappings;
 227
 228         __u8 entity[16];
 229         __u8 index;     /* Bit index in bmControls */
 230         __u8 selector;
 231
 232         __u16 size;
 233         __u32 flags;
 234 };
 235
 236 struct uvc_control_mapping {
 237         struct list_head list;
 238
 239         struct uvc_control_info *ctrl;
 240
 241         __u32 id;
 242         __u8 name[32];
 243         __u8 entity[16];
 244         __u8 selector;
 245
 246         __u8 size;
 247         __u8 offset;
 248         enum v4l2_ctrl_type v4l2_type;
 249         __u32 data_type;
 250
 251         struct uvc_menu_info *menu_info;
 252         __u32 menu_count;
 253
 254         __s32 (*get) (struct uvc_control_mapping *mapping, __u8 query,
 255                       const __u8 *data);
 256         void (*set) (struct uvc_control_mapping *mapping, __s32 value,
 257                      __u8 *data);
 258 };
 259
 260 struct uvc_control {
 261         struct uvc_entity *entity;
 262         struct uvc_control_info info;
 263
 264         __u8 index;     /* Used to match the uvc_control entry with a
 265                            uvc_control_info. */
 266         __u8 dirty:1,
 267              loaded:1,
 268              modified:1,
 269              cached:1,
 270              initialized:1;
 271
 272         __u8 *uvc_data;
 273 };
 274
 275 struct uvc_format_desc {
 276         char *name;
 277         __u8 guid[16];
 278         __u32 fcc;
 279 };
 280
 281 /* The term 'entity' refers to both UVC units and UVC terminals.
 282  *
 283  * The type field is either the terminal type (wTerminalType in the terminal
 284  * descriptor), or the unit type (bDescriptorSubtype in the unit descriptor).
 285  * As the bDescriptorSubtype field is one byte long, the type value will
 286  * always have a null MSB for units. All terminal types defined by the UVC
 287  * specification have a non-null MSB, so it is safe to use the MSB to
 288  * differentiate between units and terminals as long as the descriptor parsing
 289  * code makes sure terminal types have a non-null MSB.
 290  *
 291  * For terminals, the type's most significant bit stores the terminal
 292  * direction (either UVC_TERM_INPUT or UVC_TERM_OUTPUT). The type field should
 293  * always be accessed with the UVC_ENTITY_* macros and never directly.
 294  */
 295
 296 struct uvc_entity {
 297         struct list_head list;          /* Entity as part of a UVC device. */
 298         struct list_head chain;         /* Entity as part of a video device
 299                                          * chain. */
 300         __u8 id;
 301         __u16 type;
 302         char name[64];
 303
 304         union {
 305                 struct {
 306                         __u16 wObjectiveFocalLengthMin;
 307                         __u16 wObjectiveFocalLengthMax;
 308                         __u16 wOcularFocalLength;
 309                         __u8  bControlSize;
 310                         __u8  *bmControls;
 311                 } camera;
 312
 313                 struct {
 314                         __u8  bControlSize;
 315                         __u8  *bmControls;
 316                         __u8  bTransportModeSize;
 317                         __u8  *bmTransportModes;
 318                 } media;
 319
 320                 struct {
 321                 } output;
 322
 323                 struct {
 324                         __u16 wMaxMultiplier;
 325                         __u8  bControlSize;
 326                         __u8  *bmControls;
 327                         __u8  bmVideoStandards;
 328                 } processing;
 329
 330                 struct {
 331                 } selector;
 332
 333                 struct {
 334                         __u8  guidExtensionCode[16];
 335                         __u8  bNumControls;
 336                         __u8  bControlSize;
 337                         __u8  *bmControls;
 338                         __u8  *bmControlsType;
 339                 } extension;
 340         };
 341
 342         __u8 bNrInPins;
 343         __u8 *baSourceID;
 344
 345         unsigned int ncontrols;
 346         struct uvc_control *controls;
 347 };
 348
 349 struct uvc_frame {
 350         __u8  bFrameIndex;
 351         __u8  bmCapabilities;
 352         __u16 wWidth;
 353         __u16 wHeight;
 354         __u32 dwMinBitRate;
 355         __u32 dwMaxBitRate;
 356         __u32 dwMaxVideoFrameBufferSize;
 357         __u8  bFrameIntervalType;
 358         __u32 dwDefaultFrameInterval;
 359         __u32 *dwFrameInterval;
 360 };
 361
 362 struct uvc_format {
 363         __u8 type;
 364         __u8 index;
 365         __u8 bpp;
 366         __u8 colorspace;
 367         __u32 fcc;
 368         __u32 flags;
 369
 370         char name[32];
 371
 372         unsigned int nframes;
 373         struct uvc_frame *frame;
 374 };
 375
 376 struct uvc_streaming_header {
 377         __u8 bNumFormats;
 378         __u8 bEndpointAddress;
 379         __u8 bTerminalLink;
 380         __u8 bControlSize;
 381         __u8 *bmaControls;
 382         /* The following fields are used by input headers only. */
 383         __u8 bmInfo;
 384         __u8 bStillCaptureMethod;
 385         __u8 bTriggerSupport;
 386         __u8 bTriggerUsage;
 387 };
 388
 389 enum uvc_buffer_state {
 390         UVC_BUF_STATE_IDLE      = 0,
 391         UVC_BUF_STATE_QUEUED    = 1,
 392         UVC_BUF_STATE_ACTIVE    = 2,
 393         UVC_BUF_STATE_READY     = 3,
 394         UVC_BUF_STATE_DONE      = 4,
 395         UVC_BUF_STATE_ERROR     = 5,
 396 };
 397
 398 struct uvc_buffer {
 399         unsigned long vma_use_count;
 400         struct list_head stream;
 401
 402         /* Touched by interrupt handler. */
 403         struct v4l2_buffer buf;
 404         struct list_head queue;
 405         wait_queue_head_t wait;
 406         enum uvc_buffer_state state;
 407         unsigned int error;
 408 };
 409
 410 #define UVC_QUEUE_STREAMING             (1 << 0)
 411 #define UVC_QUEUE_DISCONNECTED          (1 << 1)
 412 #define UVC_QUEUE_DROP_CORRUPTED        (1 << 2)
 413
 414 struct uvc_video_queue {
 415         enum v4l2_buf_type type;
 416
 417         void *mem;
 418         unsigned int flags;
 419
 420         unsigned int count;
 421         unsigned int buf_size;
 422         unsigned int buf_used;
 423         struct uvc_buffer buffer[UVC_MAX_VIDEO_BUFFERS];
 424         struct mutex mutex;     /* protects buffers and mainqueue */
 425         spinlock_t irqlock;     /* protects irqqueue */
 426
 427         struct list_head mainqueue;
 428         struct list_head irqqueue;
 429 };
 430
 431 struct uvc_video_chain {
 432         struct uvc_device *dev;
 433         struct list_head list;
 434
 435         struct list_head entities;              /* All entities */
 436         struct uvc_entity *processing;          /* Processing unit */
 437         struct uvc_entity *selector;            /* Selector unit */
 438
 439         struct mutex ctrl_mutex;                /* Protects ctrl.info */
 440 };
 441
 442 struct uvc_streaming {
 443         struct list_head list;
 444         struct uvc_device *dev;
 445         struct video_device *vdev;
 446         struct uvc_video_chain *chain;
 447         atomic_t active;
 448
 449         struct usb_interface *intf;
 450         int intfnum;
 451         __u16 maxpsize;
 452
 453         struct uvc_streaming_header header;
 454         enum v4l2_buf_type type;
 455
 456         unsigned int nformats;
 457         struct uvc_format *format;
 458
 459         struct uvc_streaming_control ctrl;
 460         struct uvc_format *cur_format;
 461         struct uvc_frame *cur_frame;
 462         /* Protect access to ctrl, cur_format, cur_frame and hardware video
 463          * probe control.
 464          */
 465         struct mutex mutex;
 466
 467         unsigned int frozen : 1;
 468         struct uvc_video_queue queue;
 469         void (*decode) (struct urb *urb, struct uvc_streaming *video,
 470                         struct uvc_buffer *buf);
 471
 472         /* Context data used by the bulk completion handler. */
 473         struct {
 474                 __u8 header[256];
 475                 unsigned int header_size;
 476                 int skip_payload;
 477                 __u32 payload_size;
 478                 __u32 max_payload_size;
 479         } bulk;
 480
 481         struct urb *urb[UVC_URBS];
 482         char *urb_buffer[UVC_URBS];
 483         dma_addr_t urb_dma[UVC_URBS];
 484         unsigned int urb_size;
 485
 486         __u32 sequence;
 487         __u8 last_fid;
 488 };
 489
 490 enum uvc_device_state {
 491         UVC_DEV_DISCONNECTED = 1,
 492 };
 493
 494 struct uvc_device {
 495         struct usb_device *udev;
 496         struct usb_interface *intf;
 497         unsigned long warnings;
 498         __u32 quirks;
 499         int intfnum;
 500         char name[32];
 501
 502         enum uvc_device_state state;
 503         atomic_t users;
 504         atomic_t nmappings;
 505
 506         /* Video control interface */
 507         __u16 uvc_version;
 508         __u32 clock_frequency;
 509
 510         struct list_head entities;
 511         struct list_head chains;
 512
 513         /* Video Streaming interfaces */
 514         struct list_head streams;
 515         atomic_t nstreams;
 516
 517         /* Status Interrupt Endpoint */
 518         struct usb_host_endpoint *int_ep;
 519         struct urb *int_urb;
 520         __u8 *status;
 521         struct input_dev *input;
 522         char input_phys[64];
 523 };
 524
 525 enum uvc_handle_state {
 526         UVC_HANDLE_PASSIVE      = 0,
 527         UVC_HANDLE_ACTIVE       = 1,
 528 };
 529
 530 struct uvc_fh {
 531         struct uvc_video_chain *chain;
 532         struct uvc_streaming *stream;
 533         enum uvc_handle_state state;
 534 };
 535
 536 struct uvc_driver {
 537         struct usb_driver driver;
 538 };
 539
 540 /* ------------------------------------------------------------------------
 541  * Debugging, printing and logging
 542  */
 543
 544 #define UVC_TRACE_PROBE         (1 << 0)
 545 #define UVC_TRACE_DESCR         (1 << 1)
 546 #define UVC_TRACE_CONTROL       (1 << 2)
 547 #define UVC_TRACE_FORMAT        (1 << 3)
 548 #define UVC_TRACE_CAPTURE       (1 << 4)
 549 #define UVC_TRACE_CALLS         (1 << 5)
 550 #define UVC_TRACE_IOCTL         (1 << 6)
 551 #define UVC_TRACE_FRAME         (1 << 7)
 552 #define UVC_TRACE_SUSPEND       (1 << 8)
 553 #define UVC_TRACE_STATUS        (1 << 9)
 554 #define UVC_TRACE_VIDEO         (1 << 10)
 555
 556 #define UVC_WARN_MINMAX         0
 557 #define UVC_WARN_PROBE_DEF      1
 558
 559 extern unsigned int uvc_clock_param;
 560 extern unsigned int uvc_no_drop_param;
 561 extern unsigned int uvc_trace_param;
 562 extern unsigned int uvc_timeout_param;
 563
 564 #define uvc_trace(flag, msg...) \
 565         do { \
 566                 if (uvc_trace_param & flag) \
 567                         printk(KERN_DEBUG "uvcvideo: " msg); \
 568         } while (0)
 569
 570 #define uvc_warn_once(dev, warn, msg...) \
 571         do { \
 572                 if (!test_and_set_bit(warn, &dev->warnings)) \
 573                         printk(KERN_INFO "uvcvideo: " msg); \
 574         } while (0)
 575
 576 #define uvc_printk(level, msg...) \
 577         printk(level "uvcvideo: " msg)
 578
 579 /* --------------------------------------------------------------------------
 580  * Internal functions.
 581  */
 582
 583 /* Core driver */
 584 extern struct uvc_driver uvc_driver;
 585
 586 /* Video buffers queue management. */
 587 extern void uvc_queue_init(struct uvc_video_queue *queue,
 588                 enum v4l2_buf_type type, int drop_corrupted);
 589 extern int uvc_alloc_buffers(struct uvc_video_queue *queue,
 590                 unsigned int nbuffers, unsigned int buflength);
 591 extern int uvc_free_buffers(struct uvc_video_queue *queue);
 592 extern int uvc_query_buffer(struct uvc_video_queue *queue,
 593                 struct v4l2_buffer *v4l2_buf);
 594 extern int uvc_queue_buffer(struct uvc_video_queue *queue,
 595                 struct v4l2_buffer *v4l2_buf);
 596 extern int uvc_dequeue_buffer(struct uvc_video_queue *queue,
 597                 struct v4l2_buffer *v4l2_buf, int nonblocking);
 598 extern int uvc_queue_enable(struct uvc_video_queue *queue, int enable);
 599 extern void uvc_queue_cancel(struct uvc_video_queue *queue, int disconnect);
 600 extern struct uvc_buffer *uvc_queue_next_buffer(struct uvc_video_queue *queue,
 601                 struct uvc_buffer *buf);
 602 extern int uvc_queue_mmap(struct uvc_video_queue *queue,
 603                 struct vm_area_struct *vma);
 604 extern unsigned int uvc_queue_poll(struct uvc_video_queue *queue,
 605                 struct file *file, poll_table *wait);
 606 #ifndef CONFIG_MMU
 607 extern unsigned long uvc_queue_get_unmapped_area(struct uvc_video_queue *queue,
 608                 unsigned long pgoff);
 609 #endif
 610 extern int uvc_queue_allocated(struct uvc_video_queue *queue);
 611 static inline int uvc_queue_streaming(struct uvc_video_queue *queue)
 612 {
 613         return queue->flags & UVC_QUEUE_STREAMING;
 614 }
 615
 616 /* V4L2 interface */
 617 extern const struct v4l2_file_operations uvc_fops;
 618
 619 /* Video */
 620 extern int uvc_video_init(struct uvc_streaming *stream);
 621 extern int uvc_video_suspend(struct uvc_streaming *stream);
 622 extern int uvc_video_resume(struct uvc_streaming *stream);
 623 extern int uvc_video_enable(struct uvc_streaming *stream, int enable);
 624 extern int uvc_probe_video(struct uvc_streaming *stream,
 625                 struct uvc_streaming_control *probe);
 626 extern int uvc_commit_video(struct uvc_streaming *stream,
 627                 struct uvc_streaming_control *ctrl);
 628 extern int uvc_query_ctrl(struct uvc_device *dev, __u8 query, __u8 unit,
 629                 __u8 intfnum, __u8 cs, void *data, __u16 size);
 630
 631 /* Status */
 632 extern int uvc_status_init(struct uvc_device *dev);
 633 extern void uvc_status_cleanup(struct uvc_device *dev);
 634 extern int uvc_status_start(struct uvc_device *dev);
 635 extern void uvc_status_stop(struct uvc_device *dev);
 636 extern int uvc_status_suspend(struct uvc_device *dev);
 637 extern int uvc_status_resume(struct uvc_device *dev);
 638
 639 /* Controls */
 640 extern int uvc_query_v4l2_ctrl(struct uvc_video_chain *chain,
 641                 struct v4l2_queryctrl *v4l2_ctrl);
 642 extern int uvc_query_v4l2_menu(struct uvc_video_chain *chain,
 643                 struct v4l2_querymenu *query_menu);
 644
 645 extern int uvc_ctrl_add_mapping(struct uvc_video_chain *chain,
 646                 const struct uvc_control_mapping *mapping);
 647 extern int uvc_ctrl_init_device(struct uvc_device *dev);
 648 extern void uvc_ctrl_cleanup_device(struct uvc_device *dev);
 649 extern int uvc_ctrl_resume_device(struct uvc_device *dev);
 650
 651 extern int uvc_ctrl_begin(struct uvc_video_chain *chain);
 652 extern int __uvc_ctrl_commit(struct uvc_video_chain *chain, int rollback);
 653 static inline int uvc_ctrl_commit(struct uvc_video_chain *chain)
 654 {
 655         return __uvc_ctrl_commit(chain, 0);
 656 }
 657 static inline int uvc_ctrl_rollback(struct uvc_video_chain *chain)
 658 {
 659         return __uvc_ctrl_commit(chain, 1);
 660 }
 661
 662 extern int uvc_ctrl_get(struct uvc_video_chain *chain,
 663                 struct v4l2_ext_control *xctrl);
 664 extern int uvc_ctrl_set(struct uvc_video_chain *chain,
 665                 struct v4l2_ext_control *xctrl);
 666
 667 extern int uvc_xu_ctrl_query(struct uvc_video_chain *chain,
 668                 struct uvc_xu_control_query *xqry);
 669
 670 /* Utility functions */
 671 extern void uvc_simplify_fraction(uint32_t *numerator, uint32_t *denominator,
 672                 unsigned int n_terms, unsigned int threshold);
 673 extern uint32_t uvc_fraction_to_interval(uint32_t numerator,
 674                 uint32_t denominator);
 675 extern struct usb_host_endpoint *uvc_find_endpoint(
 676                 struct usb_host_interface *alts, __u8 epaddr);
 677
 678 /* Quirks support */
 679 void uvc_video_decode_isight(struct urb *urb, struct uvc_streaming *stream,
 680                 struct uvc_buffer *buf);
 681
 682 #endif /* __KERNEL__ */
 683
 684 #endif