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.h>
 102 #include <linux/usb/video.h>
 103 #include <linux/uvcvideo.h>
 104 #include <media/media-device.h>
 105 #include <media/v4l2-device.h>
 106
 107 /* --------------------------------------------------------------------------
 108  * UVC constants
 109  */
 110
 111 #define UVC_TERM_INPUT                  0x0000
 112 #define UVC_TERM_OUTPUT                 0x8000
 113 #define UVC_TERM_DIRECTION(term)        ((term)->type & 0x8000)
 114
 115 #define UVC_ENTITY_TYPE(entity)         ((entity)->type & 0x7fff)
 116 #define UVC_ENTITY_IS_UNIT(entity)      (((entity)->type & 0xff00) == 0)
 117 #define UVC_ENTITY_IS_TERM(entity)      (((entity)->type & 0xff00) != 0)
 118 #define UVC_ENTITY_IS_ITERM(entity) \
 119         (UVC_ENTITY_IS_TERM(entity) && \
 120         ((entity)->type & 0x8000) == UVC_TERM_INPUT)
 121 #define UVC_ENTITY_IS_OTERM(entity) \
 122         (UVC_ENTITY_IS_TERM(entity) && \
 123         ((entity)->type & 0x8000) == UVC_TERM_OUTPUT)
 124
 125
 126 /* ------------------------------------------------------------------------
 127  * GUIDs
 128  */
 129 #define UVC_GUID_UVC_CAMERA \
 130         {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, \
 131          0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01}
 132 #define UVC_GUID_UVC_OUTPUT \
 133         {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, \
 134          0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02}
 135 #define UVC_GUID_UVC_MEDIA_TRANSPORT_INPUT \
 136         {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, \
 137          0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x03}
 138 #define UVC_GUID_UVC_PROCESSING \
 139         {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, \
 140          0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x01}
 141 #define UVC_GUID_UVC_SELECTOR \
 142         {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, \
 143          0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x02}
 144
 145 #define UVC_GUID_FORMAT_MJPEG \
 146         { 'M',  'J',  'P',  'G', 0x00, 0x00, 0x10, 0x00, \
 147          0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
 148 #define UVC_GUID_FORMAT_YUY2 \
 149         { 'Y',  'U',  'Y',  '2', 0x00, 0x00, 0x10, 0x00, \
 150          0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
 151 #define UVC_GUID_FORMAT_YUY2_ISIGHT \
 152         { 'Y',  'U',  'Y',  '2', 0x00, 0x00, 0x10, 0x00, \
 153          0x80, 0x00, 0x00, 0x00, 0x00, 0x38, 0x9b, 0x71}
 154 #define UVC_GUID_FORMAT_NV12 \
 155         { 'N',  'V',  '1',  '2', 0x00, 0x00, 0x10, 0x00, \
 156          0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
 157 #define UVC_GUID_FORMAT_YV12 \
 158         { 'Y',  'V',  '1',  '2', 0x00, 0x00, 0x10, 0x00, \
 159          0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
 160 #define UVC_GUID_FORMAT_I420 \
 161         { 'I',  '4',  '2',  '0', 0x00, 0x00, 0x10, 0x00, \
 162          0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
 163 #define UVC_GUID_FORMAT_UYVY \
 164         { 'U',  'Y',  'V',  'Y', 0x00, 0x00, 0x10, 0x00, \
 165          0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
 166 #define UVC_GUID_FORMAT_Y800 \
 167         { 'Y',  '8',  '0',  '0', 0x00, 0x00, 0x10, 0x00, \
 168          0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
 169 #define UVC_GUID_FORMAT_Y16 \
 170         { 'Y',  '1',  '6',  ' ', 0x00, 0x00, 0x10, 0x00, \
 171          0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
 172 #define UVC_GUID_FORMAT_BY8 \
 173         { 'B',  'Y',  '8',  ' ', 0x00, 0x00, 0x10, 0x00, \
 174          0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
 175 #define UVC_GUID_FORMAT_RGBP \
 176         { 'R',  'G',  'B',  'P', 0x00, 0x00, 0x10, 0x00, \
 177          0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
 178 #define UVC_GUID_FORMAT_M420 \
 179         { 'M',  '4',  '2',  '0', 0x00, 0x00, 0x10, 0x00, \
 180          0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
 181
 182 /* ------------------------------------------------------------------------
 183  * Driver specific constants.
 184  */
 185
 186 #define DRIVER_VERSION          "1.1.1"
 187
 188 /* Number of isochronous URBs. */
 189 #define UVC_URBS                5
 190 /* Maximum number of packets per URB. */
 191 #define UVC_MAX_PACKETS         32
 192 /* Maximum number of video buffers. */
 193 #define UVC_MAX_VIDEO_BUFFERS   32
 194 /* Maximum status buffer size in bytes of interrupt URB. */
 195 #define UVC_MAX_STATUS_SIZE     16
 196
 197 #define UVC_CTRL_CONTROL_TIMEOUT        300
 198 #define UVC_CTRL_STREAMING_TIMEOUT      5000
 199
 200 /* Maximum allowed number of control mappings per device */
 201 #define UVC_MAX_CONTROL_MAPPINGS        1024
 202
 203 /* Devices quirks */
 204 #define UVC_QUIRK_STATUS_INTERVAL       0x00000001
 205 #define UVC_QUIRK_PROBE_MINMAX          0x00000002
 206 #define UVC_QUIRK_PROBE_EXTRAFIELDS     0x00000004
 207 #define UVC_QUIRK_BUILTIN_ISIGHT        0x00000008
 208 #define UVC_QUIRK_STREAM_NO_FID         0x00000010
 209 #define UVC_QUIRK_IGNORE_SELECTOR_UNIT  0x00000020
 210 #define UVC_QUIRK_FIX_BANDWIDTH         0x00000080
 211 #define UVC_QUIRK_PROBE_DEF             0x00000100
 212 #define UVC_QUIRK_RESTRICT_FRAME_RATE   0x00000200
 213
 214 /* Format flags */
 215 #define UVC_FMT_FLAG_COMPRESSED         0x00000001
 216 #define UVC_FMT_FLAG_STREAM             0x00000002
 217
 218 /* ------------------------------------------------------------------------
 219  * Structures.
 220  */
 221
 222 struct uvc_device;
 223
 224 /* TODO: Put the most frequently accessed fields at the beginning of
 225  * structures to maximize cache efficiency.
 226  */
 227 struct uvc_control_info {
 228         struct list_head mappings;
 229
 230         __u8 entity[16];
 231         __u8 index;     /* Bit index in bmControls */
 232         __u8 selector;
 233
 234         __u16 size;
 235         __u32 flags;
 236 };
 237
 238 struct uvc_control_mapping {
 239         struct list_head list;
 240
 241         struct uvc_control_info *ctrl;
 242
 243         __u32 id;
 244         __u8 name[32];
 245         __u8 entity[16];
 246         __u8 selector;
 247
 248         __u8 size;
 249         __u8 offset;
 250         enum v4l2_ctrl_type v4l2_type;
 251         __u32 data_type;
 252
 253         struct uvc_menu_info *menu_info;
 254         __u32 menu_count;
 255
 256         __s32 (*get) (struct uvc_control_mapping *mapping, __u8 query,
 257                       const __u8 *data);
 258         void (*set) (struct uvc_control_mapping *mapping, __s32 value,
 259                      __u8 *data);
 260 };
 261
 262 struct uvc_control {
 263         struct uvc_entity *entity;
 264         struct uvc_control_info info;
 265
 266         __u8 index;     /* Used to match the uvc_control entry with a
 267                            uvc_control_info. */
 268         __u8 dirty:1,
 269              loaded:1,
 270              modified:1,
 271              cached:1,
 272              initialized:1;
 273
 274         __u8 *uvc_data;
 275 };
 276
 277 struct uvc_format_desc {
 278         char *name;
 279         __u8 guid[16];
 280         __u32 fcc;
 281 };
 282
 283 /* The term 'entity' refers to both UVC units and UVC terminals.
 284  *
 285  * The type field is either the terminal type (wTerminalType in the terminal
 286  * descriptor), or the unit type (bDescriptorSubtype in the unit descriptor).
 287  * As the bDescriptorSubtype field is one byte long, the type value will
 288  * always have a null MSB for units. All terminal types defined by the UVC
 289  * specification have a non-null MSB, so it is safe to use the MSB to
 290  * differentiate between units and terminals as long as the descriptor parsing
 291  * code makes sure terminal types have a non-null MSB.
 292  *
 293  * For terminals, the type's most significant bit stores the terminal
 294  * direction (either UVC_TERM_INPUT or UVC_TERM_OUTPUT). The type field should
 295  * always be accessed with the UVC_ENTITY_* macros and never directly.
 296  */
 297
 298 struct uvc_entity {
 299         struct list_head list;          /* Entity as part of a UVC device. */
 300         struct list_head chain;         /* Entity as part of a video device
 301                                          * chain. */
 302         __u8 id;
 303         __u16 type;
 304         char name[64];
 305
 306         /* Media controller-related fields. */
 307         struct video_device *vdev;
 308         struct v4l2_subdev subdev;
 309         unsigned int num_pads;
 310         unsigned int num_links;
 311         struct media_pad *pads;
 312
 313         union {
 314                 struct {
 315                         __u16 wObjectiveFocalLengthMin;
 316                         __u16 wObjectiveFocalLengthMax;
 317                         __u16 wOcularFocalLength;
 318                         __u8  bControlSize;
 319                         __u8  *bmControls;
 320                 } camera;
 321
 322                 struct {
 323                         __u8  bControlSize;
 324                         __u8  *bmControls;
 325                         __u8  bTransportModeSize;
 326                         __u8  *bmTransportModes;
 327                 } media;
 328
 329                 struct {
 330                 } output;
 331
 332                 struct {
 333                         __u16 wMaxMultiplier;
 334                         __u8  bControlSize;
 335                         __u8  *bmControls;
 336                         __u8  bmVideoStandards;
 337                 } processing;
 338
 339                 struct {
 340                 } selector;
 341
 342                 struct {
 343                         __u8  guidExtensionCode[16];
 344                         __u8  bNumControls;
 345                         __u8  bControlSize;
 346                         __u8  *bmControls;
 347                         __u8  *bmControlsType;
 348                 } extension;
 349         };
 350
 351         __u8 bNrInPins;
 352         __u8 *baSourceID;
 353
 354         unsigned int ncontrols;
 355         struct uvc_control *controls;
 356 };
 357
 358 struct uvc_frame {
 359         __u8  bFrameIndex;
 360         __u8  bmCapabilities;
 361         __u16 wWidth;
 362         __u16 wHeight;
 363         __u32 dwMinBitRate;
 364         __u32 dwMaxBitRate;
 365         __u32 dwMaxVideoFrameBufferSize;
 366         __u8  bFrameIntervalType;
 367         __u32 dwDefaultFrameInterval;
 368         __u32 *dwFrameInterval;
 369 };
 370
 371 struct uvc_format {
 372         __u8 type;
 373         __u8 index;
 374         __u8 bpp;
 375         __u8 colorspace;
 376         __u32 fcc;
 377         __u32 flags;
 378
 379         char name[32];
 380
 381         unsigned int nframes;
 382         struct uvc_frame *frame;
 383 };
 384
 385 struct uvc_streaming_header {
 386         __u8 bNumFormats;
 387         __u8 bEndpointAddress;
 388         __u8 bTerminalLink;
 389         __u8 bControlSize;
 390         __u8 *bmaControls;
 391         /* The following fields are used by input headers only. */
 392         __u8 bmInfo;
 393         __u8 bStillCaptureMethod;
 394         __u8 bTriggerSupport;
 395         __u8 bTriggerUsage;
 396 };
 397
 398 enum uvc_buffer_state {
 399         UVC_BUF_STATE_IDLE      = 0,
 400         UVC_BUF_STATE_QUEUED    = 1,
 401         UVC_BUF_STATE_ACTIVE    = 2,
 402         UVC_BUF_STATE_READY     = 3,
 403         UVC_BUF_STATE_DONE      = 4,
 404         UVC_BUF_STATE_ERROR     = 5,
 405 };
 406
 407 struct uvc_buffer {
 408         unsigned long vma_use_count;
 409         struct list_head stream;
 410
 411         /* Touched by interrupt handler. */
 412         struct v4l2_buffer buf;
 413         struct list_head queue;
 414         wait_queue_head_t wait;
 415         enum uvc_buffer_state state;
 416         unsigned int error;
 417 };
 418
 419 #define UVC_QUEUE_STREAMING             (1 << 0)
 420 #define UVC_QUEUE_DISCONNECTED          (1 << 1)
 421 #define UVC_QUEUE_DROP_CORRUPTED        (1 << 2)
 422
 423 struct uvc_video_queue {
 424         enum v4l2_buf_type type;
 425
 426         void *mem;
 427         unsigned int flags;
 428
 429         unsigned int count;
 430         unsigned int buf_size;
 431         unsigned int buf_used;
 432         struct uvc_buffer buffer[UVC_MAX_VIDEO_BUFFERS];
 433         struct mutex mutex;     /* protects buffers and mainqueue */
 434         spinlock_t irqlock;     /* protects irqqueue */
 435
 436         struct list_head mainqueue;
 437         struct list_head irqqueue;
 438 };
 439
 440 struct uvc_video_chain {
 441         struct uvc_device *dev;
 442         struct list_head list;
 443
 444         struct list_head entities;              /* All entities */
 445         struct uvc_entity *processing;          /* Processing unit */
 446         struct uvc_entity *selector;            /* Selector unit */
 447
 448         struct mutex ctrl_mutex;                /* Protects ctrl.info */
 449 };
 450
 451 struct uvc_streaming {
 452         struct list_head list;
 453         struct uvc_device *dev;
 454         struct video_device *vdev;
 455         struct uvc_video_chain *chain;
 456         atomic_t active;
 457
 458         struct usb_interface *intf;
 459         int intfnum;
 460         __u16 maxpsize;
 461
 462         struct uvc_streaming_header header;
 463         enum v4l2_buf_type type;
 464
 465         unsigned int nformats;
 466         struct uvc_format *format;
 467
 468         struct uvc_streaming_control ctrl;
 469         struct uvc_format *cur_format;
 470         struct uvc_frame *cur_frame;
 471         /* Protect access to ctrl, cur_format, cur_frame and hardware video
 472          * probe control.
 473          */
 474         struct mutex mutex;
 475
 476         unsigned int frozen : 1;
 477         struct uvc_video_queue queue;
 478         void (*decode) (struct urb *urb, struct uvc_streaming *video,
 479                         struct uvc_buffer *buf);
 480
 481         /* Context data used by the bulk completion handler. */
 482         struct {
 483                 __u8 header[256];
 484                 unsigned int header_size;
 485                 int skip_payload;
 486                 __u32 payload_size;
 487                 __u32 max_payload_size;
 488         } bulk;
 489
 490         struct urb *urb[UVC_URBS];
 491         char *urb_buffer[UVC_URBS];
 492         dma_addr_t urb_dma[UVC_URBS];
 493         unsigned int urb_size;
 494
 495         __u32 sequence;
 496         __u8 last_fid;
 497 };
 498
 499 enum uvc_device_state {
 500         UVC_DEV_DISCONNECTED = 1,
 501 };
 502
 503 struct uvc_device {
 504         struct usb_device *udev;
 505         struct usb_interface *intf;
 506         unsigned long warnings;
 507         __u32 quirks;
 508         int intfnum;
 509         char name[32];
 510
 511         enum uvc_device_state state;
 512         atomic_t users;
 513         atomic_t nmappings;
 514
 515         /* Video control interface */
 516 #ifdef CONFIG_MEDIA_CONTROLLER
 517         struct media_device mdev;
 518 #endif
 519         struct v4l2_device vdev;
 520         __u16 uvc_version;
 521         __u32 clock_frequency;
 522
 523         struct list_head entities;
 524         struct list_head chains;
 525
 526         /* Video Streaming interfaces */
 527         struct list_head streams;
 528         atomic_t nstreams;
 529
 530         /* Status Interrupt Endpoint */
 531         struct usb_host_endpoint *int_ep;
 532         struct urb *int_urb;
 533         __u8 *status;
 534         struct input_dev *input;
 535         char input_phys[64];
 536 };
 537
 538 enum uvc_handle_state {
 539         UVC_HANDLE_PASSIVE      = 0,
 540         UVC_HANDLE_ACTIVE       = 1,
 541 };
 542
 543 struct uvc_fh {
 544         struct uvc_video_chain *chain;
 545         struct uvc_streaming *stream;
 546         enum uvc_handle_state state;
 547 };
 548
 549 struct uvc_driver {
 550         struct usb_driver driver;
 551 };
 552
 553 /* ------------------------------------------------------------------------
 554  * Debugging, printing and logging
 555  */
 556
 557 #define UVC_TRACE_PROBE         (1 << 0)
 558 #define UVC_TRACE_DESCR         (1 << 1)
 559 #define UVC_TRACE_CONTROL       (1 << 2)
 560 #define UVC_TRACE_FORMAT        (1 << 3)
 561 #define UVC_TRACE_CAPTURE       (1 << 4)
 562 #define UVC_TRACE_CALLS         (1 << 5)
 563 #define UVC_TRACE_IOCTL         (1 << 6)
 564 #define UVC_TRACE_FRAME         (1 << 7)
 565 #define UVC_TRACE_SUSPEND       (1 << 8)
 566 #define UVC_TRACE_STATUS        (1 << 9)
 567 #define UVC_TRACE_VIDEO         (1 << 10)
 568
 569 #define UVC_WARN_MINMAX         0
 570 #define UVC_WARN_PROBE_DEF      1
 571
 572 extern unsigned int uvc_clock_param;
 573 extern unsigned int uvc_no_drop_param;
 574 extern unsigned int uvc_trace_param;
 575 extern unsigned int uvc_timeout_param;
 576
 577 #define uvc_trace(flag, msg...) \
 578         do { \
 579                 if (uvc_trace_param & flag) \
 580                         printk(KERN_DEBUG "uvcvideo: " msg); \
 581         } while (0)
 582
 583 #define uvc_warn_once(dev, warn, msg...) \
 584         do { \
 585                 if (!test_and_set_bit(warn, &dev->warnings)) \
 586                         printk(KERN_INFO "uvcvideo: " msg); \
 587         } while (0)
 588
 589 #define uvc_printk(level, msg...) \
 590         printk(level "uvcvideo: " msg)
 591
 592 /* --------------------------------------------------------------------------
 593  * Internal functions.
 594  */
 595
 596 /* Core driver */
 597 extern struct uvc_driver uvc_driver;
 598
 599 extern struct uvc_entity *uvc_entity_by_id(struct uvc_device *dev, int id);
 600
 601 /* Video buffers queue management. */
 602 extern void uvc_queue_init(struct uvc_video_queue *queue,
 603                 enum v4l2_buf_type type, int drop_corrupted);
 604 extern int uvc_alloc_buffers(struct uvc_video_queue *queue,
 605                 unsigned int nbuffers, unsigned int buflength);
 606 extern int uvc_free_buffers(struct uvc_video_queue *queue);
 607 extern int uvc_query_buffer(struct uvc_video_queue *queue,
 608                 struct v4l2_buffer *v4l2_buf);
 609 extern int uvc_queue_buffer(struct uvc_video_queue *queue,
 610                 struct v4l2_buffer *v4l2_buf);
 611 extern int uvc_dequeue_buffer(struct uvc_video_queue *queue,
 612                 struct v4l2_buffer *v4l2_buf, int nonblocking);
 613 extern int uvc_queue_enable(struct uvc_video_queue *queue, int enable);
 614 extern void uvc_queue_cancel(struct uvc_video_queue *queue, int disconnect);
 615 extern struct uvc_buffer *uvc_queue_next_buffer(struct uvc_video_queue *queue,
 616                 struct uvc_buffer *buf);
 617 extern int uvc_queue_mmap(struct uvc_video_queue *queue,
 618                 struct vm_area_struct *vma);
 619 extern unsigned int uvc_queue_poll(struct uvc_video_queue *queue,
 620                 struct file *file, poll_table *wait);
 621 #ifndef CONFIG_MMU
 622 extern unsigned long uvc_queue_get_unmapped_area(struct uvc_video_queue *queue,
 623                 unsigned long pgoff);
 624 #endif
 625 extern int uvc_queue_allocated(struct uvc_video_queue *queue);
 626 static inline int uvc_queue_streaming(struct uvc_video_queue *queue)
 627 {
 628         return queue->flags & UVC_QUEUE_STREAMING;
 629 }
 630
 631 /* V4L2 interface */
 632 extern const struct v4l2_file_operations uvc_fops;
 633
 634 /* Media controller */
 635 extern int uvc_mc_register_entities(struct uvc_video_chain *chain);
 636 extern void uvc_mc_cleanup_entity(struct uvc_entity *entity);
 637
 638 /* Video */
 639 extern int uvc_video_init(struct uvc_streaming *stream);
 640 extern int uvc_video_suspend(struct uvc_streaming *stream);
 641 extern int uvc_video_resume(struct uvc_streaming *stream, int reset);
 642 extern int uvc_video_enable(struct uvc_streaming *stream, int enable);
 643 extern int uvc_probe_video(struct uvc_streaming *stream,
 644                 struct uvc_streaming_control *probe);
 645 extern int uvc_commit_video(struct uvc_streaming *stream,
 646                 struct uvc_streaming_control *ctrl);
 647 extern int uvc_query_ctrl(struct uvc_device *dev, __u8 query, __u8 unit,
 648                 __u8 intfnum, __u8 cs, void *data, __u16 size);
 649
 650 /* Status */
 651 extern int uvc_status_init(struct uvc_device *dev);
 652 extern void uvc_status_cleanup(struct uvc_device *dev);
 653 extern int uvc_status_start(struct uvc_device *dev);
 654 extern void uvc_status_stop(struct uvc_device *dev);
 655 extern int uvc_status_suspend(struct uvc_device *dev);
 656 extern int uvc_status_resume(struct uvc_device *dev);
 657
 658 /* Controls */
 659 extern int uvc_query_v4l2_ctrl(struct uvc_video_chain *chain,
 660                 struct v4l2_queryctrl *v4l2_ctrl);
 661 extern int uvc_query_v4l2_menu(struct uvc_video_chain *chain,
 662                 struct v4l2_querymenu *query_menu);
 663
 664 extern int uvc_ctrl_add_mapping(struct uvc_video_chain *chain,
 665                 const struct uvc_control_mapping *mapping);
 666 extern int uvc_ctrl_init_device(struct uvc_device *dev);
 667 extern void uvc_ctrl_cleanup_device(struct uvc_device *dev);
 668 extern int uvc_ctrl_resume_device(struct uvc_device *dev);
 669
 670 extern int uvc_ctrl_begin(struct uvc_video_chain *chain);
 671 extern int __uvc_ctrl_commit(struct uvc_video_chain *chain, int rollback);
 672 static inline int uvc_ctrl_commit(struct uvc_video_chain *chain)
 673 {
 674         return __uvc_ctrl_commit(chain, 0);
 675 }
 676 static inline int uvc_ctrl_rollback(struct uvc_video_chain *chain)
 677 {
 678         return __uvc_ctrl_commit(chain, 1);
 679 }
 680
 681 extern int uvc_ctrl_get(struct uvc_video_chain *chain,
 682                 struct v4l2_ext_control *xctrl);
 683 extern int uvc_ctrl_set(struct uvc_video_chain *chain,
 684                 struct v4l2_ext_control *xctrl);
 685
 686 extern int uvc_xu_ctrl_query(struct uvc_video_chain *chain,
 687                 struct uvc_xu_control_query *xqry);
 688
 689 /* Utility functions */
 690 extern void uvc_simplify_fraction(uint32_t *numerator, uint32_t *denominator,
 691                 unsigned int n_terms, unsigned int threshold);
 692 extern uint32_t uvc_fraction_to_interval(uint32_t numerator,
 693                 uint32_t denominator);
 694 extern struct usb_host_endpoint *uvc_find_endpoint(
 695                 struct usb_host_interface *alts, __u8 epaddr);
 696
 697 /* Quirks support */
 698 void uvc_video_decode_isight(struct urb *urb, struct uvc_streaming *stream,
 699                 struct uvc_buffer *buf);
 700
 701 #endif /* __KERNEL__ */
 702
 703 #endif