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_xu_control_mapping {
  44         __u32 id;
  45         __u8 name[32];
  46         __u8 entity[16];
  47         __u8 selector;
  48
  49         __u8 size;
  50         __u8 offset;
  51         enum v4l2_ctrl_type v4l2_type;
  52         __u32 data_type;
  53 };
  54
  55 struct uvc_xu_control {
  56         __u8 unit;
  57         __u8 selector;
  58         __u16 size;
  59         __u8 __user *data;
  60 };
  61
  62 #define UVCIOC_CTRL_ADD         _IOW('U', 1, struct uvc_xu_control_info)
  63 #define UVCIOC_CTRL_MAP         _IOWR('U', 2, struct uvc_xu_control_mapping)
  64 #define UVCIOC_CTRL_GET         _IOWR('U', 3, struct uvc_xu_control)
  65 #define UVCIOC_CTRL_SET         _IOW('U', 4, struct uvc_xu_control)
  66
  67 #ifdef __KERNEL__
  68
  69 #include <linux/poll.h>
  70 #include <linux/usb/video.h>
  71
  72 /* --------------------------------------------------------------------------
  73  * UVC constants
  74  */
  75
  76 #define UVC_TERM_INPUT                  0x0000
  77 #define UVC_TERM_OUTPUT                 0x8000
  78 #define UVC_TERM_DIRECTION(term)        ((term)->type & 0x8000)
  79
  80 #define UVC_ENTITY_TYPE(entity)         ((entity)->type & 0x7fff)
  81 #define UVC_ENTITY_IS_UNIT(entity)      (((entity)->type & 0xff00) == 0)
  82 #define UVC_ENTITY_IS_TERM(entity)      (((entity)->type & 0xff00) != 0)
  83 #define UVC_ENTITY_IS_ITERM(entity) \
  84         (UVC_ENTITY_IS_TERM(entity) && \
  85         ((entity)->type & 0x8000) == UVC_TERM_INPUT)
  86 #define UVC_ENTITY_IS_OTERM(entity) \
  87         (UVC_ENTITY_IS_TERM(entity) && \
  88         ((entity)->type & 0x8000) == UVC_TERM_OUTPUT)
  89
  90
  91 /* ------------------------------------------------------------------------
  92  * GUIDs
  93  */
  94 #define UVC_GUID_UVC_CAMERA \
  95         {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, \
  96          0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01}
  97 #define UVC_GUID_UVC_OUTPUT \
  98         {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, \
  99          0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02}
 100 #define UVC_GUID_UVC_MEDIA_TRANSPORT_INPUT \
 101         {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, \
 102          0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x03}
 103 #define UVC_GUID_UVC_PROCESSING \
 104         {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, \
 105          0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x01}
 106 #define UVC_GUID_UVC_SELECTOR \
 107         {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, \
 108          0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x02}
 109
 110 #define UVC_GUID_FORMAT_MJPEG \
 111         { 'M',  'J',  'P',  'G', 0x00, 0x00, 0x10, 0x00, \
 112          0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
 113 #define UVC_GUID_FORMAT_YUY2 \
 114         { 'Y',  'U',  'Y',  '2', 0x00, 0x00, 0x10, 0x00, \
 115          0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
 116 #define UVC_GUID_FORMAT_YUY2_ISIGHT \
 117         { 'Y',  'U',  'Y',  '2', 0x00, 0x00, 0x10, 0x00, \
 118          0x80, 0x00, 0x00, 0x00, 0x00, 0x38, 0x9b, 0x71}
 119 #define UVC_GUID_FORMAT_NV12 \
 120         { 'N',  'V',  '1',  '2', 0x00, 0x00, 0x10, 0x00, \
 121          0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
 122 #define UVC_GUID_FORMAT_YV12 \
 123         { 'Y',  'V',  '1',  '2', 0x00, 0x00, 0x10, 0x00, \
 124          0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
 125 #define UVC_GUID_FORMAT_I420 \
 126         { 'I',  '4',  '2',  '0', 0x00, 0x00, 0x10, 0x00, \
 127          0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
 128 #define UVC_GUID_FORMAT_UYVY \
 129         { 'U',  'Y',  'V',  'Y', 0x00, 0x00, 0x10, 0x00, \
 130          0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
 131 #define UVC_GUID_FORMAT_Y800 \
 132         { 'Y',  '8',  '0',  '0', 0x00, 0x00, 0x10, 0x00, \
 133          0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
 134 #define UVC_GUID_FORMAT_Y16 \
 135         { 'Y',  '1',  '6',  ' ', 0x00, 0x00, 0x10, 0x00, \
 136          0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
 137 #define UVC_GUID_FORMAT_BY8 \
 138         { 'B',  'Y',  '8',  ' ', 0x00, 0x00, 0x10, 0x00, \
 139          0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
 140
 141 /* ------------------------------------------------------------------------
 142  * Driver specific constants.
 143  */
 144
 145 #define DRIVER_VERSION_NUMBER   KERNEL_VERSION(0, 1, 0)
 146
 147 /* Number of isochronous URBs. */
 148 #define UVC_URBS                5
 149 /* Maximum number of packets per URB. */
 150 #define UVC_MAX_PACKETS         32
 151 /* Maximum number of video buffers. */
 152 #define UVC_MAX_VIDEO_BUFFERS   32
 153 /* Maximum status buffer size in bytes of interrupt URB. */
 154 #define UVC_MAX_STATUS_SIZE     16
 155
 156 #define UVC_CTRL_CONTROL_TIMEOUT        300
 157 #define UVC_CTRL_STREAMING_TIMEOUT      5000
 158
 159 /* Devices quirks */
 160 #define UVC_QUIRK_STATUS_INTERVAL       0x00000001
 161 #define UVC_QUIRK_PROBE_MINMAX          0x00000002
 162 #define UVC_QUIRK_PROBE_EXTRAFIELDS     0x00000004
 163 #define UVC_QUIRK_BUILTIN_ISIGHT        0x00000008
 164 #define UVC_QUIRK_STREAM_NO_FID         0x00000010
 165 #define UVC_QUIRK_IGNORE_SELECTOR_UNIT  0x00000020
 166 #define UVC_QUIRK_FIX_BANDWIDTH         0x00000080
 167 #define UVC_QUIRK_PROBE_DEF             0x00000100
 168
 169 /* Format flags */
 170 #define UVC_FMT_FLAG_COMPRESSED         0x00000001
 171 #define UVC_FMT_FLAG_STREAM             0x00000002
 172
 173 /* ------------------------------------------------------------------------
 174  * Structures.
 175  */
 176
 177 struct uvc_device;
 178
 179 /* TODO: Put the most frequently accessed fields at the beginning of
 180  * structures to maximize cache efficiency.
 181  */
 182 struct uvc_streaming_control {
 183         __u16 bmHint;
 184         __u8  bFormatIndex;
 185         __u8  bFrameIndex;
 186         __u32 dwFrameInterval;
 187         __u16 wKeyFrameRate;
 188         __u16 wPFrameRate;
 189         __u16 wCompQuality;
 190         __u16 wCompWindowSize;
 191         __u16 wDelay;
 192         __u32 dwMaxVideoFrameSize;
 193         __u32 dwMaxPayloadTransferSize;
 194         __u32 dwClockFrequency;
 195         __u8  bmFramingInfo;
 196         __u8  bPreferedVersion;
 197         __u8  bMinVersion;
 198         __u8  bMaxVersion;
 199 };
 200
 201 struct uvc_menu_info {
 202         __u32 value;
 203         __u8 name[32];
 204 };
 205
 206 struct uvc_control_info {
 207         struct list_head list;
 208         struct list_head mappings;
 209
 210         __u8 entity[16];
 211         __u8 index;
 212         __u8 selector;
 213
 214         __u16 size;
 215         __u32 flags;
 216 };
 217
 218 struct uvc_control_mapping {
 219         struct list_head list;
 220
 221         struct uvc_control_info *ctrl;
 222
 223         __u32 id;
 224         __u8 name[32];
 225         __u8 entity[16];
 226         __u8 selector;
 227
 228         __u8 size;
 229         __u8 offset;
 230         enum v4l2_ctrl_type v4l2_type;
 231         __u32 data_type;
 232
 233         struct uvc_menu_info *menu_info;
 234         __u32 menu_count;
 235
 236         __s32 (*get) (struct uvc_control_mapping *mapping, __u8 query,
 237                       const __u8 *data);
 238         void (*set) (struct uvc_control_mapping *mapping, __s32 value,
 239                      __u8 *data);
 240 };
 241
 242 struct uvc_control {
 243         struct uvc_entity *entity;
 244         struct uvc_control_info *info;
 245
 246         __u8 index;     /* Used to match the uvc_control entry with a
 247                            uvc_control_info. */
 248         __u8 dirty : 1,
 249              loaded : 1,
 250              modified : 1,
 251              cached : 1;
 252
 253         __u8 *data;
 254 };
 255
 256 struct uvc_format_desc {
 257         char *name;
 258         __u8 guid[16];
 259         __u32 fcc;
 260 };
 261
 262 /* The term 'entity' refers to both UVC units and UVC terminals.
 263  *
 264  * The type field is either the terminal type (wTerminalType in the terminal
 265  * descriptor), or the unit type (bDescriptorSubtype in the unit descriptor).
 266  * As the bDescriptorSubtype field is one byte long, the type value will
 267  * always have a null MSB for units. All terminal types defined by the UVC
 268  * specification have a non-null MSB, so it is safe to use the MSB to
 269  * differentiate between units and terminals as long as the descriptor parsing
 270  * code makes sure terminal types have a non-null MSB.
 271  *
 272  * For terminals, the type's most significant bit stores the terminal
 273  * direction (either UVC_TERM_INPUT or UVC_TERM_OUTPUT). The type field should
 274  * always be accessed with the UVC_ENTITY_* macros and never directly.
 275  */
 276
 277 struct uvc_entity {
 278         struct list_head list;          /* Entity as part of a UVC device. */
 279         struct list_head chain;         /* Entity as part of a video device
 280                                          * chain. */
 281         __u8 id;
 282         __u16 type;
 283         char name[64];
 284
 285         union {
 286                 struct {
 287                         __u16 wObjectiveFocalLengthMin;
 288                         __u16 wObjectiveFocalLengthMax;
 289                         __u16 wOcularFocalLength;
 290                         __u8  bControlSize;
 291                         __u8  *bmControls;
 292                 } camera;
 293
 294                 struct {
 295                         __u8  bControlSize;
 296                         __u8  *bmControls;
 297                         __u8  bTransportModeSize;
 298                         __u8  *bmTransportModes;
 299                 } media;
 300
 301                 struct {
 302                 } output;
 303
 304                 struct {
 305                         __u16 wMaxMultiplier;
 306                         __u8  bControlSize;
 307                         __u8  *bmControls;
 308                         __u8  bmVideoStandards;
 309                 } processing;
 310
 311                 struct {
 312                 } selector;
 313
 314                 struct {
 315                         __u8  guidExtensionCode[16];
 316                         __u8  bNumControls;
 317                         __u8  bControlSize;
 318                         __u8  *bmControls;
 319                         __u8  *bmControlsType;
 320                 } extension;
 321         };
 322
 323         __u8 bNrInPins;
 324         __u8 *baSourceID;
 325
 326         unsigned int ncontrols;
 327         struct uvc_control *controls;
 328 };
 329
 330 struct uvc_frame {
 331         __u8  bFrameIndex;
 332         __u8  bmCapabilities;
 333         __u16 wWidth;
 334         __u16 wHeight;
 335         __u32 dwMinBitRate;
 336         __u32 dwMaxBitRate;
 337         __u32 dwMaxVideoFrameBufferSize;
 338         __u8  bFrameIntervalType;
 339         __u32 dwDefaultFrameInterval;
 340         __u32 *dwFrameInterval;
 341 };
 342
 343 struct uvc_format {
 344         __u8 type;
 345         __u8 index;
 346         __u8 bpp;
 347         __u8 colorspace;
 348         __u32 fcc;
 349         __u32 flags;
 350
 351         char name[32];
 352
 353         unsigned int nframes;
 354         struct uvc_frame *frame;
 355 };
 356
 357 struct uvc_streaming_header {
 358         __u8 bNumFormats;
 359         __u8 bEndpointAddress;
 360         __u8 bTerminalLink;
 361         __u8 bControlSize;
 362         __u8 *bmaControls;
 363         /* The following fields are used by input headers only. */
 364         __u8 bmInfo;
 365         __u8 bStillCaptureMethod;
 366         __u8 bTriggerSupport;
 367         __u8 bTriggerUsage;
 368 };
 369
 370 enum uvc_buffer_state {
 371         UVC_BUF_STATE_IDLE      = 0,
 372         UVC_BUF_STATE_QUEUED    = 1,
 373         UVC_BUF_STATE_ACTIVE    = 2,
 374         UVC_BUF_STATE_READY     = 3,
 375         UVC_BUF_STATE_DONE      = 4,
 376         UVC_BUF_STATE_ERROR     = 5,
 377 };
 378
 379 struct uvc_buffer {
 380         unsigned long vma_use_count;
 381         struct list_head stream;
 382
 383         /* Touched by interrupt handler. */
 384         struct v4l2_buffer buf;
 385         struct list_head queue;
 386         wait_queue_head_t wait;
 387         enum uvc_buffer_state state;
 388 };
 389
 390 #define UVC_QUEUE_STREAMING             (1 << 0)
 391 #define UVC_QUEUE_DISCONNECTED          (1 << 1)
 392 #define UVC_QUEUE_DROP_INCOMPLETE       (1 << 2)
 393
 394 struct uvc_video_queue {
 395         enum v4l2_buf_type type;
 396
 397         void *mem;
 398         unsigned int flags;
 399         __u32 sequence;
 400
 401         unsigned int count;
 402         unsigned int buf_size;
 403         unsigned int buf_used;
 404         struct uvc_buffer buffer[UVC_MAX_VIDEO_BUFFERS];
 405         struct mutex mutex;     /* protects buffers and mainqueue */
 406         spinlock_t irqlock;     /* protects irqqueue */
 407
 408         struct list_head mainqueue;
 409         struct list_head irqqueue;
 410 };
 411
 412 struct uvc_video_chain {
 413         struct uvc_device *dev;
 414         struct list_head list;
 415
 416         struct list_head entities;              /* All entities */
 417         struct uvc_entity *processing;          /* Processing unit */
 418         struct uvc_entity *selector;            /* Selector unit */
 419
 420         struct mutex ctrl_mutex;
 421 };
 422
 423 struct uvc_streaming {
 424         struct list_head list;
 425         struct uvc_device *dev;
 426         struct video_device *vdev;
 427         struct uvc_video_chain *chain;
 428         atomic_t active;
 429
 430         struct usb_interface *intf;
 431         int intfnum;
 432         __u16 maxpsize;
 433
 434         struct uvc_streaming_header header;
 435         enum v4l2_buf_type type;
 436
 437         unsigned int nformats;
 438         struct uvc_format *format;
 439
 440         struct uvc_streaming_control ctrl;
 441         struct uvc_format *cur_format;
 442         struct uvc_frame *cur_frame;
 443
 444         struct mutex mutex;
 445
 446         unsigned int frozen : 1;
 447         struct uvc_video_queue queue;
 448         void (*decode) (struct urb *urb, struct uvc_streaming *video,
 449                         struct uvc_buffer *buf);
 450
 451         /* Context data used by the bulk completion handler. */
 452         struct {
 453                 __u8 header[256];
 454                 unsigned int header_size;
 455                 int skip_payload;
 456                 __u32 payload_size;
 457                 __u32 max_payload_size;
 458         } bulk;
 459
 460         struct urb *urb[UVC_URBS];
 461         char *urb_buffer[UVC_URBS];
 462         dma_addr_t urb_dma[UVC_URBS];
 463         unsigned int urb_size;
 464
 465         __u8 last_fid;
 466 };
 467
 468 enum uvc_device_state {
 469         UVC_DEV_DISCONNECTED = 1,
 470 };
 471
 472 struct uvc_device {
 473         struct usb_device *udev;
 474         struct usb_interface *intf;
 475         unsigned long warnings;
 476         __u32 quirks;
 477         int intfnum;
 478         char name[32];
 479
 480         enum uvc_device_state state;
 481         struct list_head list;
 482         atomic_t users;
 483
 484         /* Video control interface */
 485         __u16 uvc_version;
 486         __u32 clock_frequency;
 487
 488         struct list_head entities;
 489         struct list_head chains;
 490
 491         /* Video Streaming interfaces */
 492         struct list_head streams;
 493         atomic_t nstreams;
 494
 495         /* Status Interrupt Endpoint */
 496         struct usb_host_endpoint *int_ep;
 497         struct urb *int_urb;
 498         __u8 *status;
 499         struct input_dev *input;
 500         char input_phys[64];
 501 };
 502
 503 enum uvc_handle_state {
 504         UVC_HANDLE_PASSIVE      = 0,
 505         UVC_HANDLE_ACTIVE       = 1,
 506 };
 507
 508 struct uvc_fh {
 509         struct uvc_video_chain *chain;
 510         struct uvc_streaming *stream;
 511         enum uvc_handle_state state;
 512 };
 513
 514 struct uvc_driver {
 515         struct usb_driver driver;
 516
 517         struct list_head devices;       /* struct uvc_device list */
 518         struct list_head controls;      /* struct uvc_control_info list */
 519         struct mutex ctrl_mutex;        /* protects controls and devices
 520                                            lists */
 521 };
 522
 523 /* ------------------------------------------------------------------------
 524  * Debugging, printing and logging
 525  */
 526
 527 #define UVC_TRACE_PROBE         (1 << 0)
 528 #define UVC_TRACE_DESCR         (1 << 1)
 529 #define UVC_TRACE_CONTROL       (1 << 2)
 530 #define UVC_TRACE_FORMAT        (1 << 3)
 531 #define UVC_TRACE_CAPTURE       (1 << 4)
 532 #define UVC_TRACE_CALLS         (1 << 5)
 533 #define UVC_TRACE_IOCTL         (1 << 6)
 534 #define UVC_TRACE_FRAME         (1 << 7)
 535 #define UVC_TRACE_SUSPEND       (1 << 8)
 536 #define UVC_TRACE_STATUS        (1 << 9)
 537 #define UVC_TRACE_VIDEO         (1 << 10)
 538
 539 #define UVC_WARN_MINMAX         0
 540 #define UVC_WARN_PROBE_DEF      1
 541
 542 extern unsigned int uvc_clock_param;
 543 extern unsigned int uvc_no_drop_param;
 544 extern unsigned int uvc_trace_param;
 545 extern unsigned int uvc_timeout_param;
 546
 547 #define uvc_trace(flag, msg...) \
 548         do { \
 549                 if (uvc_trace_param & flag) \
 550                         printk(KERN_DEBUG "uvcvideo: " msg); \
 551         } while (0)
 552
 553 #define uvc_warn_once(dev, warn, msg...) \
 554         do { \
 555                 if (!test_and_set_bit(warn, &dev->warnings)) \
 556                         printk(KERN_INFO "uvcvideo: " msg); \
 557         } while (0)
 558
 559 #define uvc_printk(level, msg...) \
 560         printk(level "uvcvideo: " msg)
 561
 562 /* --------------------------------------------------------------------------
 563  * Internal functions.
 564  */
 565
 566 /* Core driver */
 567 extern struct uvc_driver uvc_driver;
 568
 569 /* Video buffers queue management. */
 570 extern void uvc_queue_init(struct uvc_video_queue *queue,
 571                 enum v4l2_buf_type type);
 572 extern int uvc_alloc_buffers(struct uvc_video_queue *queue,
 573                 unsigned int nbuffers, unsigned int buflength);
 574 extern int uvc_free_buffers(struct uvc_video_queue *queue);
 575 extern int uvc_query_buffer(struct uvc_video_queue *queue,
 576                 struct v4l2_buffer *v4l2_buf);
 577 extern int uvc_queue_buffer(struct uvc_video_queue *queue,
 578                 struct v4l2_buffer *v4l2_buf);
 579 extern int uvc_dequeue_buffer(struct uvc_video_queue *queue,
 580                 struct v4l2_buffer *v4l2_buf, int nonblocking);
 581 extern int uvc_queue_enable(struct uvc_video_queue *queue, int enable);
 582 extern void uvc_queue_cancel(struct uvc_video_queue *queue, int disconnect);
 583 extern struct uvc_buffer *uvc_queue_next_buffer(struct uvc_video_queue *queue,
 584                 struct uvc_buffer *buf);
 585 extern unsigned int uvc_queue_poll(struct uvc_video_queue *queue,
 586                 struct file *file, poll_table *wait);
 587 extern int uvc_queue_allocated(struct uvc_video_queue *queue);
 588 static inline int uvc_queue_streaming(struct uvc_video_queue *queue)
 589 {
 590         return queue->flags & UVC_QUEUE_STREAMING;
 591 }
 592
 593 /* V4L2 interface */
 594 extern const struct v4l2_file_operations uvc_fops;
 595
 596 /* Video */
 597 extern int uvc_video_init(struct uvc_streaming *stream);
 598 extern int uvc_video_suspend(struct uvc_streaming *stream);
 599 extern int uvc_video_resume(struct uvc_streaming *stream);
 600 extern int uvc_video_enable(struct uvc_streaming *stream, int enable);
 601 extern int uvc_probe_video(struct uvc_streaming *stream,
 602                 struct uvc_streaming_control *probe);
 603 extern int uvc_commit_video(struct uvc_streaming *stream,
 604                 struct uvc_streaming_control *ctrl);
 605 extern int uvc_query_ctrl(struct uvc_device *dev, __u8 query, __u8 unit,
 606                 __u8 intfnum, __u8 cs, void *data, __u16 size);
 607
 608 /* Status */
 609 extern int uvc_status_init(struct uvc_device *dev);
 610 extern void uvc_status_cleanup(struct uvc_device *dev);
 611 extern int uvc_status_start(struct uvc_device *dev);
 612 extern void uvc_status_stop(struct uvc_device *dev);
 613 extern int uvc_status_suspend(struct uvc_device *dev);
 614 extern int uvc_status_resume(struct uvc_device *dev);
 615
 616 /* Controls */
 617 extern struct uvc_control *uvc_find_control(struct uvc_video_chain *chain,
 618                 __u32 v4l2_id, struct uvc_control_mapping **mapping);
 619 extern int uvc_query_v4l2_ctrl(struct uvc_video_chain *chain,
 620                 struct v4l2_queryctrl *v4l2_ctrl);
 621
 622 extern int uvc_ctrl_add_info(struct uvc_control_info *info);
 623 extern int uvc_ctrl_add_mapping(struct uvc_control_mapping *mapping);
 624 extern int uvc_ctrl_init_device(struct uvc_device *dev);
 625 extern void uvc_ctrl_cleanup_device(struct uvc_device *dev);
 626 extern int uvc_ctrl_resume_device(struct uvc_device *dev);
 627 extern void uvc_ctrl_init(void);
 628
 629 extern int uvc_ctrl_begin(struct uvc_video_chain *chain);
 630 extern int __uvc_ctrl_commit(struct uvc_video_chain *chain, int rollback);
 631 static inline int uvc_ctrl_commit(struct uvc_video_chain *chain)
 632 {
 633         return __uvc_ctrl_commit(chain, 0);
 634 }
 635 static inline int uvc_ctrl_rollback(struct uvc_video_chain *chain)
 636 {
 637         return __uvc_ctrl_commit(chain, 1);
 638 }
 639
 640 extern int uvc_ctrl_get(struct uvc_video_chain *chain,
 641                 struct v4l2_ext_control *xctrl);
 642 extern int uvc_ctrl_set(struct uvc_video_chain *chain,
 643                 struct v4l2_ext_control *xctrl);
 644
 645 extern int uvc_xu_ctrl_query(struct uvc_video_chain *chain,
 646                 struct uvc_xu_control *ctrl, int set);
 647
 648 /* Utility functions */
 649 extern void uvc_simplify_fraction(uint32_t *numerator, uint32_t *denominator,
 650                 unsigned int n_terms, unsigned int threshold);
 651 extern uint32_t uvc_fraction_to_interval(uint32_t numerator,
 652                 uint32_t denominator);
 653 extern struct usb_host_endpoint *uvc_find_endpoint(
 654                 struct usb_host_interface *alts, __u8 epaddr);
 655
 656 /* Quirks support */
 657 void uvc_video_decode_isight(struct urb *urb, struct uvc_streaming *stream,
 658                 struct uvc_buffer *buf);
 659
 660 #endif /* __KERNEL__ */
 661
 662 #endif
 663