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 /*
   8  * Dynamic controls
   9  */
  10
  11 /* Data types for UVC control data */
  12 #define UVC_CTRL_DATA_TYPE_RAW          0
  13 #define UVC_CTRL_DATA_TYPE_SIGNED       1
  14 #define UVC_CTRL_DATA_TYPE_UNSIGNED     2
  15 #define UVC_CTRL_DATA_TYPE_BOOLEAN      3
  16 #define UVC_CTRL_DATA_TYPE_ENUM         4
  17 #define UVC_CTRL_DATA_TYPE_BITMASK      5
  18
  19 /* Control flags */
  20 #define UVC_CONTROL_SET_CUR     (1 << 0)
  21 #define UVC_CONTROL_GET_CUR     (1 << 1)
  22 #define UVC_CONTROL_GET_MIN     (1 << 2)
  23 #define UVC_CONTROL_GET_MAX     (1 << 3)
  24 #define UVC_CONTROL_GET_RES     (1 << 4)
  25 #define UVC_CONTROL_GET_DEF     (1 << 5)
  26 /* Control should be saved at suspend and restored at resume. */
  27 #define UVC_CONTROL_RESTORE     (1 << 6)
  28 /* Control can be updated by the camera. */
  29 #define UVC_CONTROL_AUTO_UPDATE (1 << 7)
  30
  31 #define UVC_CONTROL_GET_RANGE   (UVC_CONTROL_GET_CUR | UVC_CONTROL_GET_MIN | \
  32                                  UVC_CONTROL_GET_MAX | UVC_CONTROL_GET_RES | \
  33                                  UVC_CONTROL_GET_DEF)
  34
  35 struct uvc_xu_control_info {
  36         __u8 entity[16];
  37         __u8 index;
  38         __u8 selector;
  39         __u16 size;
  40         __u32 flags;
  41 };
  42
  43 struct uvc_menu_info {
  44         __u32 value;
  45         __u8 name[32];
  46 };
  47
  48 struct uvc_xu_control_mapping_old {
  49         __u8 reserved[64];
  50 };
  51
  52 struct uvc_xu_control_mapping {
  53         __u32 id;
  54         __u8 name[32];
  55         __u8 entity[16];
  56         __u8 selector;
  57
  58         __u8 size;
  59         __u8 offset;
  60         enum v4l2_ctrl_type v4l2_type;
  61         __u32 data_type;
  62
  63         struct uvc_menu_info __user *menu_info;
  64         __u32 menu_count;
  65
  66         __u32 reserved[4];
  67 };
  68
  69 struct uvc_xu_control {
  70         __u8 unit;
  71         __u8 selector;
  72         __u16 size;
  73         __u8 __user *data;
  74 };
  75
  76 #define UVCIOC_CTRL_ADD         _IOW('U', 1, struct uvc_xu_control_info)
  77 #define UVCIOC_CTRL_MAP_OLD     _IOWR('U', 2, struct uvc_xu_control_mapping_old)
  78 #define UVCIOC_CTRL_MAP         _IOWR('U', 2, struct uvc_xu_control_mapping)
  79 #define UVCIOC_CTRL_GET         _IOWR('U', 3, struct uvc_xu_control)
  80 #define UVCIOC_CTRL_SET         _IOW('U', 4, struct uvc_xu_control)
  81
  82 #ifdef __KERNEL__
  83
  84 #include <linux/poll.h>
  85 #include <linux/usb/video.h>
  86
  87 /* --------------------------------------------------------------------------
  88  * UVC constants
  89  */
  90
  91 #define UVC_TERM_INPUT                  0x0000
  92 #define UVC_TERM_OUTPUT                 0x8000
  93 #define UVC_TERM_DIRECTION(term)        ((term)->type & 0x8000)
  94
  95 #define UVC_ENTITY_TYPE(entity)         ((entity)->type & 0x7fff)
  96 #define UVC_ENTITY_IS_UNIT(entity)      (((entity)->type & 0xff00) == 0)
  97 #define UVC_ENTITY_IS_TERM(entity)      (((entity)->type & 0xff00) != 0)
  98 #define UVC_ENTITY_IS_ITERM(entity) \
  99         (UVC_ENTITY_IS_TERM(entity) && \
 100         ((entity)->type & 0x8000) == UVC_TERM_INPUT)
 101 #define UVC_ENTITY_IS_OTERM(entity) \
 102         (UVC_ENTITY_IS_TERM(entity) && \
 103         ((entity)->type & 0x8000) == UVC_TERM_OUTPUT)
 104
 105
 106 /* ------------------------------------------------------------------------
 107  * GUIDs
 108  */
 109 #define UVC_GUID_UVC_CAMERA \
 110         {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, \
 111          0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01}
 112 #define UVC_GUID_UVC_OUTPUT \
 113         {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, \
 114          0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02}
 115 #define UVC_GUID_UVC_MEDIA_TRANSPORT_INPUT \
 116         {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, \
 117          0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x03}
 118 #define UVC_GUID_UVC_PROCESSING \
 119         {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, \
 120          0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x01}
 121 #define UVC_GUID_UVC_SELECTOR \
 122         {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, \
 123          0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x02}
 124
 125 #define UVC_GUID_FORMAT_MJPEG \
 126         { 'M',  'J',  'P',  'G', 0x00, 0x00, 0x10, 0x00, \
 127          0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
 128 #define UVC_GUID_FORMAT_YUY2 \
 129         { 'Y',  'U',  'Y',  '2', 0x00, 0x00, 0x10, 0x00, \
 130          0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
 131 #define UVC_GUID_FORMAT_YUY2_ISIGHT \
 132         { 'Y',  'U',  'Y',  '2', 0x00, 0x00, 0x10, 0x00, \
 133          0x80, 0x00, 0x00, 0x00, 0x00, 0x38, 0x9b, 0x71}
 134 #define UVC_GUID_FORMAT_NV12 \
 135         { 'N',  'V',  '1',  '2', 0x00, 0x00, 0x10, 0x00, \
 136          0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
 137 #define UVC_GUID_FORMAT_YV12 \
 138         { 'Y',  'V',  '1',  '2', 0x00, 0x00, 0x10, 0x00, \
 139          0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
 140 #define UVC_GUID_FORMAT_I420 \
 141         { 'I',  '4',  '2',  '0', 0x00, 0x00, 0x10, 0x00, \
 142          0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
 143 #define UVC_GUID_FORMAT_UYVY \
 144         { 'U',  'Y',  'V',  'Y', 0x00, 0x00, 0x10, 0x00, \
 145          0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
 146 #define UVC_GUID_FORMAT_Y800 \
 147         { 'Y',  '8',  '0',  '0', 0x00, 0x00, 0x10, 0x00, \
 148          0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
 149 #define UVC_GUID_FORMAT_Y16 \
 150         { 'Y',  '1',  '6',  ' ', 0x00, 0x00, 0x10, 0x00, \
 151          0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
 152 #define UVC_GUID_FORMAT_BY8 \
 153         { 'B',  'Y',  '8',  ' ', 0x00, 0x00, 0x10, 0x00, \
 154          0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
 155
 156 /* ------------------------------------------------------------------------
 157  * Driver specific constants.
 158  */
 159
 160 #define DRIVER_VERSION_NUMBER   KERNEL_VERSION(1, 0, 0)
 161 #define DRIVER_VERSION          "v1.0.0"
 162
 163 /* Number of isochronous URBs. */
 164 #define UVC_URBS                5
 165 /* Maximum number of packets per URB. */
 166 #define UVC_MAX_PACKETS         32
 167 /* Maximum number of video buffers. */
 168 #define UVC_MAX_VIDEO_BUFFERS   32
 169 /* Maximum status buffer size in bytes of interrupt URB. */
 170 #define UVC_MAX_STATUS_SIZE     16
 171
 172 #define UVC_CTRL_CONTROL_TIMEOUT        300
 173 #define UVC_CTRL_STREAMING_TIMEOUT      5000
 174
 175 /* Maximum allowed number of control mappings per device */
 176 #define UVC_MAX_CONTROL_MAPPINGS        1024
 177
 178 /* Devices quirks */
 179 #define UVC_QUIRK_STATUS_INTERVAL       0x00000001
 180 #define UVC_QUIRK_PROBE_MINMAX          0x00000002
 181 #define UVC_QUIRK_PROBE_EXTRAFIELDS     0x00000004
 182 #define UVC_QUIRK_BUILTIN_ISIGHT        0x00000008
 183 #define UVC_QUIRK_STREAM_NO_FID         0x00000010
 184 #define UVC_QUIRK_IGNORE_SELECTOR_UNIT  0x00000020
 185 #define UVC_QUIRK_FIX_BANDWIDTH         0x00000080
 186 #define UVC_QUIRK_PROBE_DEF             0x00000100
 187 #define UVC_QUIRK_RESTRICT_FRAME_RATE   0x00000200
 188
 189 /* Format flags */
 190 #define UVC_FMT_FLAG_COMPRESSED         0x00000001
 191 #define UVC_FMT_FLAG_STREAM             0x00000002
 192
 193 /* ------------------------------------------------------------------------
 194  * Structures.
 195  */
 196
 197 struct uvc_device;
 198
 199 /* TODO: Put the most frequently accessed fields at the beginning of
 200  * structures to maximize cache efficiency.
 201  */
 202 struct uvc_control_info {
 203         struct list_head mappings;
 204
 205         __u8 entity[16];
 206         __u8 index;     /* Bit index in bmControls */
 207         __u8 selector;
 208
 209         __u16 size;
 210         __u32 flags;
 211 };
 212
 213 struct uvc_control_mapping {
 214         struct list_head list;
 215
 216         struct uvc_control_info *ctrl;
 217
 218         __u32 id;
 219         __u8 name[32];
 220         __u8 entity[16];
 221         __u8 selector;
 222
 223         __u8 size;
 224         __u8 offset;
 225         enum v4l2_ctrl_type v4l2_type;
 226         __u32 data_type;
 227
 228         struct uvc_menu_info *menu_info;
 229         __u32 menu_count;
 230
 231         __s32 (*get) (struct uvc_control_mapping *mapping, __u8 query,
 232                       const __u8 *data);
 233         void (*set) (struct uvc_control_mapping *mapping, __s32 value,
 234                      __u8 *data);
 235 };
 236
 237 struct uvc_control {
 238         struct uvc_entity *entity;
 239         struct uvc_control_info info;
 240
 241         __u8 index;     /* Used to match the uvc_control entry with a
 242                            uvc_control_info. */
 243         __u8 dirty:1,
 244              loaded:1,
 245              modified:1,
 246              cached:1,
 247              initialized:1;
 248
 249         __u8 *uvc_data;
 250 };
 251
 252 struct uvc_format_desc {
 253         char *name;
 254         __u8 guid[16];
 255         __u32 fcc;
 256 };
 257
 258 /* The term 'entity' refers to both UVC units and UVC terminals.
 259  *
 260  * The type field is either the terminal type (wTerminalType in the terminal
 261  * descriptor), or the unit type (bDescriptorSubtype in the unit descriptor).
 262  * As the bDescriptorSubtype field is one byte long, the type value will
 263  * always have a null MSB for units. All terminal types defined by the UVC
 264  * specification have a non-null MSB, so it is safe to use the MSB to
 265  * differentiate between units and terminals as long as the descriptor parsing
 266  * code makes sure terminal types have a non-null MSB.
 267  *
 268  * For terminals, the type's most significant bit stores the terminal
 269  * direction (either UVC_TERM_INPUT or UVC_TERM_OUTPUT). The type field should
 270  * always be accessed with the UVC_ENTITY_* macros and never directly.
 271  */
 272
 273 struct uvc_entity {
 274         struct list_head list;          /* Entity as part of a UVC device. */
 275         struct list_head chain;         /* Entity as part of a video device
 276                                          * chain. */
 277         __u8 id;
 278         __u16 type;
 279         char name[64];
 280
 281         union {
 282                 struct {
 283                         __u16 wObjectiveFocalLengthMin;
 284                         __u16 wObjectiveFocalLengthMax;
 285                         __u16 wOcularFocalLength;
 286                         __u8  bControlSize;
 287                         __u8  *bmControls;
 288                 } camera;
 289
 290                 struct {
 291                         __u8  bControlSize;
 292                         __u8  *bmControls;
 293                         __u8  bTransportModeSize;
 294                         __u8  *bmTransportModes;
 295                 } media;
 296
 297                 struct {
 298                 } output;
 299
 300                 struct {
 301                         __u16 wMaxMultiplier;
 302                         __u8  bControlSize;
 303                         __u8  *bmControls;
 304                         __u8  bmVideoStandards;
 305                 } processing;
 306
 307                 struct {
 308                 } selector;
 309
 310                 struct {
 311                         __u8  guidExtensionCode[16];
 312                         __u8  bNumControls;
 313                         __u8  bControlSize;
 314                         __u8  *bmControls;
 315                         __u8  *bmControlsType;
 316                 } extension;
 317         };
 318
 319         __u8 bNrInPins;
 320         __u8 *baSourceID;
 321
 322         unsigned int ncontrols;
 323         struct uvc_control *controls;
 324 };
 325
 326 struct uvc_frame {
 327         __u8  bFrameIndex;
 328         __u8  bmCapabilities;
 329         __u16 wWidth;
 330         __u16 wHeight;
 331         __u32 dwMinBitRate;
 332         __u32 dwMaxBitRate;
 333         __u32 dwMaxVideoFrameBufferSize;
 334         __u8  bFrameIntervalType;
 335         __u32 dwDefaultFrameInterval;
 336         __u32 *dwFrameInterval;
 337 };
 338
 339 struct uvc_format {
 340         __u8 type;
 341         __u8 index;
 342         __u8 bpp;
 343         __u8 colorspace;
 344         __u32 fcc;
 345         __u32 flags;
 346
 347         char name[32];
 348
 349         unsigned int nframes;
 350         struct uvc_frame *frame;
 351 };
 352
 353 struct uvc_streaming_header {
 354         __u8 bNumFormats;
 355         __u8 bEndpointAddress;
 356         __u8 bTerminalLink;
 357         __u8 bControlSize;
 358         __u8 *bmaControls;
 359         /* The following fields are used by input headers only. */
 360         __u8 bmInfo;
 361         __u8 bStillCaptureMethod;
 362         __u8 bTriggerSupport;
 363         __u8 bTriggerUsage;
 364 };
 365
 366 enum uvc_buffer_state {
 367         UVC_BUF_STATE_IDLE      = 0,
 368         UVC_BUF_STATE_QUEUED    = 1,
 369         UVC_BUF_STATE_ACTIVE    = 2,
 370         UVC_BUF_STATE_READY     = 3,
 371         UVC_BUF_STATE_DONE      = 4,
 372         UVC_BUF_STATE_ERROR     = 5,
 373 };
 374
 375 struct uvc_buffer {
 376         unsigned long vma_use_count;
 377         struct list_head stream;
 378
 379         /* Touched by interrupt handler. */
 380         struct v4l2_buffer buf;
 381         struct list_head queue;
 382         wait_queue_head_t wait;
 383         enum uvc_buffer_state state;
 384         unsigned int error;
 385 };
 386
 387 #define UVC_QUEUE_STREAMING             (1 << 0)
 388 #define UVC_QUEUE_DISCONNECTED          (1 << 1)
 389 #define UVC_QUEUE_DROP_CORRUPTED        (1 << 2)
 390
 391 struct uvc_video_queue {
 392         enum v4l2_buf_type type;
 393
 394         void *mem;
 395         unsigned int flags;
 396
 397         unsigned int count;
 398         unsigned int buf_size;
 399         unsigned int buf_used;
 400         struct uvc_buffer buffer[UVC_MAX_VIDEO_BUFFERS];
 401         struct mutex mutex;     /* protects buffers and mainqueue */
 402         spinlock_t irqlock;     /* protects irqqueue */
 403
 404         struct list_head mainqueue;
 405         struct list_head irqqueue;
 406 };
 407
 408 struct uvc_video_chain {
 409         struct uvc_device *dev;
 410         struct list_head list;
 411
 412         struct list_head entities;              /* All entities */
 413         struct uvc_entity *processing;          /* Processing unit */
 414         struct uvc_entity *selector;            /* Selector unit */
 415
 416         struct mutex ctrl_mutex;                /* Protects ctrl.info */
 417 };
 418
 419 struct uvc_streaming {
 420         struct list_head list;
 421         struct uvc_device *dev;
 422         struct video_device *vdev;
 423         struct uvc_video_chain *chain;
 424         atomic_t active;
 425
 426         struct usb_interface *intf;
 427         int intfnum;
 428         __u16 maxpsize;
 429
 430         struct uvc_streaming_header header;
 431         enum v4l2_buf_type type;
 432
 433         unsigned int nformats;
 434         struct uvc_format *format;
 435
 436         struct uvc_streaming_control ctrl;
 437         struct uvc_format *cur_format;
 438         struct uvc_frame *cur_frame;
 439
 440         struct mutex mutex;
 441
 442         unsigned int frozen : 1;
 443         struct uvc_video_queue queue;
 444         void (*decode) (struct urb *urb, struct uvc_streaming *video,
 445                         struct uvc_buffer *buf);
 446
 447         /* Context data used by the bulk completion handler. */
 448         struct {
 449                 __u8 header[256];
 450                 unsigned int header_size;
 451                 int skip_payload;
 452                 __u32 payload_size;
 453                 __u32 max_payload_size;
 454         } bulk;
 455
 456         struct urb *urb[UVC_URBS];
 457         char *urb_buffer[UVC_URBS];
 458         dma_addr_t urb_dma[UVC_URBS];
 459         unsigned int urb_size;
 460
 461         __u32 sequence;
 462         __u8 last_fid;
 463 };
 464
 465 enum uvc_device_state {
 466         UVC_DEV_DISCONNECTED = 1,
 467 };
 468
 469 struct uvc_device {
 470         struct usb_device *udev;
 471         struct usb_interface *intf;
 472         unsigned long warnings;
 473         __u32 quirks;
 474         int intfnum;
 475         char name[32];
 476
 477         enum uvc_device_state state;
 478         atomic_t users;
 479         atomic_t nmappings;
 480
 481         /* Video control interface */
 482         __u16 uvc_version;
 483         __u32 clock_frequency;
 484
 485         struct list_head entities;
 486         struct list_head chains;
 487
 488         /* Video Streaming interfaces */
 489         struct list_head streams;
 490         atomic_t nstreams;
 491
 492         /* Status Interrupt Endpoint */
 493         struct usb_host_endpoint *int_ep;
 494         struct urb *int_urb;
 495         __u8 *status;
 496         struct input_dev *input;
 497         char input_phys[64];
 498 };
 499
 500 enum uvc_handle_state {
 501         UVC_HANDLE_PASSIVE      = 0,
 502         UVC_HANDLE_ACTIVE       = 1,
 503 };
 504
 505 struct uvc_fh {
 506         struct uvc_video_chain *chain;
 507         struct uvc_streaming *stream;
 508         enum uvc_handle_state state;
 509 };
 510
 511 struct uvc_driver {
 512         struct usb_driver driver;
 513 };
 514
 515 /* ------------------------------------------------------------------------
 516  * Debugging, printing and logging
 517  */
 518
 519 #define UVC_TRACE_PROBE         (1 << 0)
 520 #define UVC_TRACE_DESCR         (1 << 1)
 521 #define UVC_TRACE_CONTROL       (1 << 2)
 522 #define UVC_TRACE_FORMAT        (1 << 3)
 523 #define UVC_TRACE_CAPTURE       (1 << 4)
 524 #define UVC_TRACE_CALLS         (1 << 5)
 525 #define UVC_TRACE_IOCTL         (1 << 6)
 526 #define UVC_TRACE_FRAME         (1 << 7)
 527 #define UVC_TRACE_SUSPEND       (1 << 8)
 528 #define UVC_TRACE_STATUS        (1 << 9)
 529 #define UVC_TRACE_VIDEO         (1 << 10)
 530
 531 #define UVC_WARN_MINMAX         0
 532 #define UVC_WARN_PROBE_DEF      1
 533
 534 extern unsigned int uvc_clock_param;
 535 extern unsigned int uvc_no_drop_param;
 536 extern unsigned int uvc_trace_param;
 537 extern unsigned int uvc_timeout_param;
 538
 539 #define uvc_trace(flag, msg...) \
 540         do { \
 541                 if (uvc_trace_param & flag) \
 542                         printk(KERN_DEBUG "uvcvideo: " msg); \
 543         } while (0)
 544
 545 #define uvc_warn_once(dev, warn, msg...) \
 546         do { \
 547                 if (!test_and_set_bit(warn, &dev->warnings)) \
 548                         printk(KERN_INFO "uvcvideo: " msg); \
 549         } while (0)
 550
 551 #define uvc_printk(level, msg...) \
 552         printk(level "uvcvideo: " msg)
 553
 554 /* --------------------------------------------------------------------------
 555  * Internal functions.
 556  */
 557
 558 /* Core driver */
 559 extern struct uvc_driver uvc_driver;
 560
 561 /* Video buffers queue management. */
 562 extern void uvc_queue_init(struct uvc_video_queue *queue,
 563                 enum v4l2_buf_type type, int drop_corrupted);
 564 extern int uvc_alloc_buffers(struct uvc_video_queue *queue,
 565                 unsigned int nbuffers, unsigned int buflength);
 566 extern int uvc_free_buffers(struct uvc_video_queue *queue);
 567 extern int uvc_query_buffer(struct uvc_video_queue *queue,
 568                 struct v4l2_buffer *v4l2_buf);
 569 extern int uvc_queue_buffer(struct uvc_video_queue *queue,
 570                 struct v4l2_buffer *v4l2_buf);
 571 extern int uvc_dequeue_buffer(struct uvc_video_queue *queue,
 572                 struct v4l2_buffer *v4l2_buf, int nonblocking);
 573 extern int uvc_queue_enable(struct uvc_video_queue *queue, int enable);
 574 extern void uvc_queue_cancel(struct uvc_video_queue *queue, int disconnect);
 575 extern struct uvc_buffer *uvc_queue_next_buffer(struct uvc_video_queue *queue,
 576                 struct uvc_buffer *buf);
 577 extern unsigned int uvc_queue_poll(struct uvc_video_queue *queue,
 578                 struct file *file, poll_table *wait);
 579 extern int uvc_queue_allocated(struct uvc_video_queue *queue);
 580 static inline int uvc_queue_streaming(struct uvc_video_queue *queue)
 581 {
 582         return queue->flags & UVC_QUEUE_STREAMING;
 583 }
 584
 585 /* V4L2 interface */
 586 extern const struct v4l2_file_operations uvc_fops;
 587
 588 /* Video */
 589 extern int uvc_video_init(struct uvc_streaming *stream);
 590 extern int uvc_video_suspend(struct uvc_streaming *stream);
 591 extern int uvc_video_resume(struct uvc_streaming *stream);
 592 extern int uvc_video_enable(struct uvc_streaming *stream, int enable);
 593 extern int uvc_probe_video(struct uvc_streaming *stream,
 594                 struct uvc_streaming_control *probe);
 595 extern int uvc_commit_video(struct uvc_streaming *stream,
 596                 struct uvc_streaming_control *ctrl);
 597 extern int uvc_query_ctrl(struct uvc_device *dev, __u8 query, __u8 unit,
 598                 __u8 intfnum, __u8 cs, void *data, __u16 size);
 599
 600 /* Status */
 601 extern int uvc_status_init(struct uvc_device *dev);
 602 extern void uvc_status_cleanup(struct uvc_device *dev);
 603 extern int uvc_status_start(struct uvc_device *dev);
 604 extern void uvc_status_stop(struct uvc_device *dev);
 605 extern int uvc_status_suspend(struct uvc_device *dev);
 606 extern int uvc_status_resume(struct uvc_device *dev);
 607
 608 /* Controls */
 609 extern struct uvc_control *uvc_find_control(struct uvc_video_chain *chain,
 610                 __u32 v4l2_id, struct uvc_control_mapping **mapping);
 611 extern int uvc_query_v4l2_ctrl(struct uvc_video_chain *chain,
 612                 struct v4l2_queryctrl *v4l2_ctrl);
 613
 614 extern int uvc_ctrl_add_mapping(struct uvc_video_chain *chain,
 615                 const struct uvc_control_mapping *mapping);
 616 extern int uvc_ctrl_init_device(struct uvc_device *dev);
 617 extern void uvc_ctrl_cleanup_device(struct uvc_device *dev);
 618 extern int uvc_ctrl_resume_device(struct uvc_device *dev);
 619
 620 extern int uvc_ctrl_begin(struct uvc_video_chain *chain);
 621 extern int __uvc_ctrl_commit(struct uvc_video_chain *chain, int rollback);
 622 static inline int uvc_ctrl_commit(struct uvc_video_chain *chain)
 623 {
 624         return __uvc_ctrl_commit(chain, 0);
 625 }
 626 static inline int uvc_ctrl_rollback(struct uvc_video_chain *chain)
 627 {
 628         return __uvc_ctrl_commit(chain, 1);
 629 }
 630
 631 extern int uvc_ctrl_get(struct uvc_video_chain *chain,
 632                 struct v4l2_ext_control *xctrl);
 633 extern int uvc_ctrl_set(struct uvc_video_chain *chain,
 634                 struct v4l2_ext_control *xctrl);
 635
 636 extern int uvc_xu_ctrl_query(struct uvc_video_chain *chain,
 637                 struct uvc_xu_control *ctrl, int set);
 638
 639 /* Utility functions */
 640 extern void uvc_simplify_fraction(uint32_t *numerator, uint32_t *denominator,
 641                 unsigned int n_terms, unsigned int threshold);
 642 extern uint32_t uvc_fraction_to_interval(uint32_t numerator,
 643                 uint32_t denominator);
 644 extern struct usb_host_endpoint *uvc_find_endpoint(
 645                 struct usb_host_interface *alts, __u8 epaddr);
 646
 647 /* Quirks support */
 648 void uvc_video_decode_isight(struct urb *urb, struct uvc_streaming *stream,
 649                 struct uvc_buffer *buf);
 650
 651 #endif /* __KERNEL__ */
 652
 653 #endif
 654