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_NV12 \
 117         { 'N',  'V',  '1',  '2', 0x00, 0x00, 0x10, 0x00, \
 118          0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
 119 #define UVC_GUID_FORMAT_YV12 \
 120         { 'Y',  'V',  '1',  '2', 0x00, 0x00, 0x10, 0x00, \
 121          0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
 122 #define UVC_GUID_FORMAT_I420 \
 123         { 'I',  '4',  '2',  '0', 0x00, 0x00, 0x10, 0x00, \
 124          0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
 125 #define UVC_GUID_FORMAT_UYVY \
 126         { 'U',  'Y',  'V',  'Y', 0x00, 0x00, 0x10, 0x00, \
 127          0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
 128 #define UVC_GUID_FORMAT_Y800 \
 129         { 'Y',  '8',  '0',  '0', 0x00, 0x00, 0x10, 0x00, \
 130          0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
 131 #define UVC_GUID_FORMAT_BY8 \
 132         { 'B',  'Y',  '8',  ' ', 0x00, 0x00, 0x10, 0x00, \
 133          0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
 134
 135
 136 /* ------------------------------------------------------------------------
 137  * Driver specific constants.
 138  */
 139
 140 #define DRIVER_VERSION_NUMBER   KERNEL_VERSION(0, 1, 0)
 141
 142 /* Number of isochronous URBs. */
 143 #define UVC_URBS                5
 144 /* Maximum number of packets per URB. */
 145 #define UVC_MAX_PACKETS         32
 146 /* Maximum number of video buffers. */
 147 #define UVC_MAX_VIDEO_BUFFERS   32
 148 /* Maximum status buffer size in bytes of interrupt URB. */
 149 #define UVC_MAX_STATUS_SIZE     16
 150
 151 #define UVC_CTRL_CONTROL_TIMEOUT        300
 152 #define UVC_CTRL_STREAMING_TIMEOUT      3000
 153
 154 /* Devices quirks */
 155 #define UVC_QUIRK_STATUS_INTERVAL       0x00000001
 156 #define UVC_QUIRK_PROBE_MINMAX          0x00000002
 157 #define UVC_QUIRK_PROBE_EXTRAFIELDS     0x00000004
 158 #define UVC_QUIRK_BUILTIN_ISIGHT        0x00000008
 159 #define UVC_QUIRK_STREAM_NO_FID         0x00000010
 160 #define UVC_QUIRK_IGNORE_SELECTOR_UNIT  0x00000020
 161 #define UVC_QUIRK_FIX_BANDWIDTH         0x00000080
 162 #define UVC_QUIRK_PROBE_DEF             0x00000100
 163
 164 /* Format flags */
 165 #define UVC_FMT_FLAG_COMPRESSED         0x00000001
 166 #define UVC_FMT_FLAG_STREAM             0x00000002
 167
 168 /* ------------------------------------------------------------------------
 169  * Structures.
 170  */
 171
 172 struct uvc_device;
 173
 174 /* TODO: Put the most frequently accessed fields at the beginning of
 175  * structures to maximize cache efficiency.
 176  */
 177 struct uvc_streaming_control {
 178         __u16 bmHint;
 179         __u8  bFormatIndex;
 180         __u8  bFrameIndex;
 181         __u32 dwFrameInterval;
 182         __u16 wKeyFrameRate;
 183         __u16 wPFrameRate;
 184         __u16 wCompQuality;
 185         __u16 wCompWindowSize;
 186         __u16 wDelay;
 187         __u32 dwMaxVideoFrameSize;
 188         __u32 dwMaxPayloadTransferSize;
 189         __u32 dwClockFrequency;
 190         __u8  bmFramingInfo;
 191         __u8  bPreferedVersion;
 192         __u8  bMinVersion;
 193         __u8  bMaxVersion;
 194 };
 195
 196 struct uvc_menu_info {
 197         __u32 value;
 198         __u8 name[32];
 199 };
 200
 201 struct uvc_control_info {
 202         struct list_head list;
 203         struct list_head mappings;
 204
 205         __u8 entity[16];
 206         __u8 index;
 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
 247         __u8 *data;
 248 };
 249
 250 struct uvc_format_desc {
 251         char *name;
 252         __u8 guid[16];
 253         __u32 fcc;
 254 };
 255
 256 /* The term 'entity' refers to both UVC units and UVC terminals.
 257  *
 258  * The type field is either the terminal type (wTerminalType in the terminal
 259  * descriptor), or the unit type (bDescriptorSubtype in the unit descriptor).
 260  * As the bDescriptorSubtype field is one byte long, the type value will
 261  * always have a null MSB for units. All terminal types defined by the UVC
 262  * specification have a non-null MSB, so it is safe to use the MSB to
 263  * differentiate between units and terminals as long as the descriptor parsing
 264  * code makes sure terminal types have a non-null MSB.
 265  *
 266  * For terminals, the type's most significant bit stores the terminal
 267  * direction (either UVC_TERM_INPUT or UVC_TERM_OUTPUT). The type field should
 268  * always be accessed with the UVC_ENTITY_* macros and never directly.
 269  */
 270
 271 struct uvc_entity {
 272         struct list_head list;          /* Entity as part of a UVC device. */
 273         struct list_head chain;         /* Entity as part of a video device
 274                                          * chain. */
 275         __u8 id;
 276         __u16 type;
 277         char name[64];
 278
 279         union {
 280                 struct {
 281                         __u16 wObjectiveFocalLengthMin;
 282                         __u16 wObjectiveFocalLengthMax;
 283                         __u16 wOcularFocalLength;
 284                         __u8  bControlSize;
 285                         __u8  *bmControls;
 286                 } camera;
 287
 288                 struct {
 289                         __u8  bControlSize;
 290                         __u8  *bmControls;
 291                         __u8  bTransportModeSize;
 292                         __u8  *bmTransportModes;
 293                 } media;
 294
 295                 struct {
 296                         __u8  bSourceID;
 297                 } output;
 298
 299                 struct {
 300                         __u8  bSourceID;
 301                         __u16 wMaxMultiplier;
 302                         __u8  bControlSize;
 303                         __u8  *bmControls;
 304                         __u8  bmVideoStandards;
 305                 } processing;
 306
 307                 struct {
 308                         __u8  bNrInPins;
 309                         __u8  *baSourceID;
 310                 } selector;
 311
 312                 struct {
 313                         __u8  guidExtensionCode[16];
 314                         __u8  bNumControls;
 315                         __u8  bNrInPins;
 316                         __u8  *baSourceID;
 317                         __u8  bControlSize;
 318                         __u8  *bmControls;
 319                         __u8  *bmControlsType;
 320                 } extension;
 321         };
 322
 323         unsigned int ncontrols;
 324         struct uvc_control *controls;
 325 };
 326
 327 struct uvc_frame {
 328         __u8  bFrameIndex;
 329         __u8  bmCapabilities;
 330         __u16 wWidth;
 331         __u16 wHeight;
 332         __u32 dwMinBitRate;
 333         __u32 dwMaxBitRate;
 334         __u32 dwMaxVideoFrameBufferSize;
 335         __u8  bFrameIntervalType;
 336         __u32 dwDefaultFrameInterval;
 337         __u32 *dwFrameInterval;
 338 };
 339
 340 struct uvc_format {
 341         __u8 type;
 342         __u8 index;
 343         __u8 bpp;
 344         __u8 colorspace;
 345         __u32 fcc;
 346         __u32 flags;
 347
 348         char name[32];
 349
 350         unsigned int nframes;
 351         struct uvc_frame *frame;
 352 };
 353
 354 struct uvc_streaming_header {
 355         __u8 bNumFormats;
 356         __u8 bEndpointAddress;
 357         __u8 bTerminalLink;
 358         __u8 bControlSize;
 359         __u8 *bmaControls;
 360         /* The following fields are used by input headers only. */
 361         __u8 bmInfo;
 362         __u8 bStillCaptureMethod;
 363         __u8 bTriggerSupport;
 364         __u8 bTriggerUsage;
 365 };
 366
 367 enum uvc_buffer_state {
 368         UVC_BUF_STATE_IDLE      = 0,
 369         UVC_BUF_STATE_QUEUED    = 1,
 370         UVC_BUF_STATE_ACTIVE    = 2,
 371         UVC_BUF_STATE_DONE      = 3,
 372         UVC_BUF_STATE_ERROR     = 4,
 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 };
 385
 386 #define UVC_QUEUE_STREAMING             (1 << 0)
 387 #define UVC_QUEUE_DISCONNECTED          (1 << 1)
 388 #define UVC_QUEUE_DROP_INCOMPLETE       (1 << 2)
 389
 390 struct uvc_video_queue {
 391         enum v4l2_buf_type type;
 392
 393         void *mem;
 394         unsigned int flags;
 395         __u32 sequence;
 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;
 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         __u8 last_fid;
 462 };
 463
 464 enum uvc_device_state {
 465         UVC_DEV_DISCONNECTED = 1,
 466 };
 467
 468 struct uvc_device {
 469         struct usb_device *udev;
 470         struct usb_interface *intf;
 471         unsigned long warnings;
 472         __u32 quirks;
 473         int intfnum;
 474         char name[32];
 475
 476         enum uvc_device_state state;
 477         struct list_head list;
 478         atomic_t users;
 479
 480         /* Video control interface */
 481         __u16 uvc_version;
 482         __u32 clock_frequency;
 483
 484         struct list_head entities;
 485         struct list_head chains;
 486
 487         /* Video Streaming interfaces */
 488         struct list_head streams;
 489         atomic_t nstreams;
 490
 491         /* Status Interrupt Endpoint */
 492         struct usb_host_endpoint *int_ep;
 493         struct urb *int_urb;
 494         __u8 *status;
 495         struct input_dev *input;
 496         char input_phys[64];
 497 };
 498
 499 enum uvc_handle_state {
 500         UVC_HANDLE_PASSIVE      = 0,
 501         UVC_HANDLE_ACTIVE       = 1,
 502 };
 503
 504 struct uvc_fh {
 505         struct uvc_video_chain *chain;
 506         struct uvc_streaming *stream;
 507         enum uvc_handle_state state;
 508 };
 509
 510 struct uvc_driver {
 511         struct usb_driver driver;
 512
 513         struct list_head devices;       /* struct uvc_device list */
 514         struct list_head controls;      /* struct uvc_control_info list */
 515         struct mutex ctrl_mutex;        /* protects controls and devices
 516                                            lists */
 517 };
 518
 519 /* ------------------------------------------------------------------------
 520  * Debugging, printing and logging
 521  */
 522
 523 #define UVC_TRACE_PROBE         (1 << 0)
 524 #define UVC_TRACE_DESCR         (1 << 1)
 525 #define UVC_TRACE_CONTROL       (1 << 2)
 526 #define UVC_TRACE_FORMAT        (1 << 3)
 527 #define UVC_TRACE_CAPTURE       (1 << 4)
 528 #define UVC_TRACE_CALLS         (1 << 5)
 529 #define UVC_TRACE_IOCTL         (1 << 6)
 530 #define UVC_TRACE_FRAME         (1 << 7)
 531 #define UVC_TRACE_SUSPEND       (1 << 8)
 532 #define UVC_TRACE_STATUS        (1 << 9)
 533 #define UVC_TRACE_VIDEO         (1 << 10)
 534
 535 #define UVC_WARN_MINMAX         0
 536 #define UVC_WARN_PROBE_DEF      1
 537
 538 extern unsigned int uvc_no_drop_param;
 539 extern unsigned int uvc_trace_param;
 540 extern unsigned int uvc_timeout_param;
 541
 542 #define uvc_trace(flag, msg...) \
 543         do { \
 544                 if (uvc_trace_param & flag) \
 545                         printk(KERN_DEBUG "uvcvideo: " msg); \
 546         } while (0)
 547
 548 #define uvc_warn_once(dev, warn, msg...) \
 549         do { \
 550                 if (!test_and_set_bit(warn, &dev->warnings)) \
 551                         printk(KERN_INFO "uvcvideo: " msg); \
 552         } while (0)
 553
 554 #define uvc_printk(level, msg...) \
 555         printk(level "uvcvideo: " msg)
 556
 557 #define UVC_GUID_FORMAT "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-" \
 558                         "%02x%02x%02x%02x%02x%02x"
 559 #define UVC_GUID_ARGS(guid) \
 560         (guid)[3],  (guid)[2],  (guid)[1],  (guid)[0], \
 561         (guid)[5],  (guid)[4], \
 562         (guid)[7],  (guid)[6], \
 563         (guid)[8],  (guid)[9], \
 564         (guid)[10], (guid)[11], (guid)[12], \
 565         (guid)[13], (guid)[14], (guid)[15]
 566
 567 /* --------------------------------------------------------------------------
 568  * Internal functions.
 569  */
 570
 571 /* Core driver */
 572 extern struct uvc_driver uvc_driver;
 573
 574 /* Video buffers queue management. */
 575 extern void uvc_queue_init(struct uvc_video_queue *queue,
 576                 enum v4l2_buf_type type);
 577 extern int uvc_alloc_buffers(struct uvc_video_queue *queue,
 578                 unsigned int nbuffers, unsigned int buflength);
 579 extern int uvc_free_buffers(struct uvc_video_queue *queue);
 580 extern int uvc_query_buffer(struct uvc_video_queue *queue,
 581                 struct v4l2_buffer *v4l2_buf);
 582 extern int uvc_queue_buffer(struct uvc_video_queue *queue,
 583                 struct v4l2_buffer *v4l2_buf);
 584 extern int uvc_dequeue_buffer(struct uvc_video_queue *queue,
 585                 struct v4l2_buffer *v4l2_buf, int nonblocking);
 586 extern int uvc_queue_enable(struct uvc_video_queue *queue, int enable);
 587 extern void uvc_queue_cancel(struct uvc_video_queue *queue, int disconnect);
 588 extern struct uvc_buffer *uvc_queue_next_buffer(struct uvc_video_queue *queue,
 589                 struct uvc_buffer *buf);
 590 extern unsigned int uvc_queue_poll(struct uvc_video_queue *queue,
 591                 struct file *file, poll_table *wait);
 592 extern int uvc_queue_allocated(struct uvc_video_queue *queue);
 593 static inline int uvc_queue_streaming(struct uvc_video_queue *queue)
 594 {
 595         return queue->flags & UVC_QUEUE_STREAMING;
 596 }
 597
 598 /* V4L2 interface */
 599 extern const struct v4l2_file_operations uvc_fops;
 600
 601 /* Video */
 602 extern int uvc_video_init(struct uvc_streaming *stream);
 603 extern int uvc_video_suspend(struct uvc_streaming *stream);
 604 extern int uvc_video_resume(struct uvc_streaming *stream);
 605 extern int uvc_video_enable(struct uvc_streaming *stream, int enable);
 606 extern int uvc_probe_video(struct uvc_streaming *stream,
 607                 struct uvc_streaming_control *probe);
 608 extern int uvc_commit_video(struct uvc_streaming *stream,
 609                 struct uvc_streaming_control *ctrl);
 610 extern int uvc_query_ctrl(struct uvc_device *dev, __u8 query, __u8 unit,
 611                 __u8 intfnum, __u8 cs, void *data, __u16 size);
 612
 613 /* Status */
 614 extern int uvc_status_init(struct uvc_device *dev);
 615 extern void uvc_status_cleanup(struct uvc_device *dev);
 616 extern int uvc_status_start(struct uvc_device *dev);
 617 extern void uvc_status_stop(struct uvc_device *dev);
 618 extern int uvc_status_suspend(struct uvc_device *dev);
 619 extern int uvc_status_resume(struct uvc_device *dev);
 620
 621 /* Controls */
 622 extern struct uvc_control *uvc_find_control(struct uvc_video_chain *chain,
 623                 __u32 v4l2_id, struct uvc_control_mapping **mapping);
 624 extern int uvc_query_v4l2_ctrl(struct uvc_video_chain *chain,
 625                 struct v4l2_queryctrl *v4l2_ctrl);
 626
 627 extern int uvc_ctrl_add_info(struct uvc_control_info *info);
 628 extern int uvc_ctrl_add_mapping(struct uvc_control_mapping *mapping);
 629 extern int uvc_ctrl_init_device(struct uvc_device *dev);
 630 extern void uvc_ctrl_cleanup_device(struct uvc_device *dev);
 631 extern int uvc_ctrl_resume_device(struct uvc_device *dev);
 632 extern void uvc_ctrl_init(void);
 633
 634 extern int uvc_ctrl_begin(struct uvc_video_chain *chain);
 635 extern int __uvc_ctrl_commit(struct uvc_video_chain *chain, int rollback);
 636 static inline int uvc_ctrl_commit(struct uvc_video_chain *chain)
 637 {
 638         return __uvc_ctrl_commit(chain, 0);
 639 }
 640 static inline int uvc_ctrl_rollback(struct uvc_video_chain *chain)
 641 {
 642         return __uvc_ctrl_commit(chain, 1);
 643 }
 644
 645 extern int uvc_ctrl_get(struct uvc_video_chain *chain,
 646                 struct v4l2_ext_control *xctrl);
 647 extern int uvc_ctrl_set(struct uvc_video_chain *chain,
 648                 struct v4l2_ext_control *xctrl);
 649
 650 extern int uvc_xu_ctrl_query(struct uvc_video_chain *chain,
 651                 struct uvc_xu_control *ctrl, int set);
 652
 653 /* Utility functions */
 654 extern void uvc_simplify_fraction(uint32_t *numerator, uint32_t *denominator,
 655                 unsigned int n_terms, unsigned int threshold);
 656 extern uint32_t uvc_fraction_to_interval(uint32_t numerator,
 657                 uint32_t denominator);
 658 extern struct usb_host_endpoint *uvc_find_endpoint(
 659                 struct usb_host_interface *alts, __u8 epaddr);
 660
 661 /* Quirks support */
 662 void uvc_video_decode_isight(struct urb *urb, struct uvc_streaming *stream,
 663                 struct uvc_buffer *buf);
 664
 665 #endif /* __KERNEL__ */
 666
 667 #endif
 668