V4L/DVB (13827): uvcvideo: Switch to a monotonic clock for V4L2 buffers timestamps
[linux-2.6.git] / 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                 } output;
297
298                 struct {
299                         __u16 wMaxMultiplier;
300                         __u8  bControlSize;
301                         __u8  *bmControls;
302                         __u8  bmVideoStandards;
303                 } processing;
304
305                 struct {
306                 } selector;
307
308                 struct {
309                         __u8  guidExtensionCode[16];
310                         __u8  bNumControls;
311                         __u8  bControlSize;
312                         __u8  *bmControls;
313                         __u8  *bmControlsType;
314                 } extension;
315         };
316
317         __u8 bNrInPins;
318         __u8 *baSourceID;
319
320         unsigned int ncontrols;
321         struct uvc_control *controls;
322 };
323
324 struct uvc_frame {
325         __u8  bFrameIndex;
326         __u8  bmCapabilities;
327         __u16 wWidth;
328         __u16 wHeight;
329         __u32 dwMinBitRate;
330         __u32 dwMaxBitRate;
331         __u32 dwMaxVideoFrameBufferSize;
332         __u8  bFrameIntervalType;
333         __u32 dwDefaultFrameInterval;
334         __u32 *dwFrameInterval;
335 };
336
337 struct uvc_format {
338         __u8 type;
339         __u8 index;
340         __u8 bpp;
341         __u8 colorspace;
342         __u32 fcc;
343         __u32 flags;
344
345         char name[32];
346
347         unsigned int nframes;
348         struct uvc_frame *frame;
349 };
350
351 struct uvc_streaming_header {
352         __u8 bNumFormats;
353         __u8 bEndpointAddress;
354         __u8 bTerminalLink;
355         __u8 bControlSize;
356         __u8 *bmaControls;
357         /* The following fields are used by input headers only. */
358         __u8 bmInfo;
359         __u8 bStillCaptureMethod;
360         __u8 bTriggerSupport;
361         __u8 bTriggerUsage;
362 };
363
364 enum uvc_buffer_state {
365         UVC_BUF_STATE_IDLE      = 0,
366         UVC_BUF_STATE_QUEUED    = 1,
367         UVC_BUF_STATE_ACTIVE    = 2,
368         UVC_BUF_STATE_READY     = 3,
369         UVC_BUF_STATE_DONE      = 4,
370         UVC_BUF_STATE_ERROR     = 5,
371 };
372
373 struct uvc_buffer {
374         unsigned long vma_use_count;
375         struct list_head stream;
376
377         /* Touched by interrupt handler. */
378         struct v4l2_buffer buf;
379         struct list_head queue;
380         wait_queue_head_t wait;
381         enum uvc_buffer_state state;
382 };
383
384 #define UVC_QUEUE_STREAMING             (1 << 0)
385 #define UVC_QUEUE_DISCONNECTED          (1 << 1)
386 #define UVC_QUEUE_DROP_INCOMPLETE       (1 << 2)
387
388 struct uvc_video_queue {
389         enum v4l2_buf_type type;
390
391         void *mem;
392         unsigned int flags;
393         __u32 sequence;
394
395         unsigned int count;
396         unsigned int buf_size;
397         unsigned int buf_used;
398         struct uvc_buffer buffer[UVC_MAX_VIDEO_BUFFERS];
399         struct mutex mutex;     /* protects buffers and mainqueue */
400         spinlock_t irqlock;     /* protects irqqueue */
401
402         struct list_head mainqueue;
403         struct list_head irqqueue;
404 };
405
406 struct uvc_video_chain {
407         struct uvc_device *dev;
408         struct list_head list;
409
410         struct list_head entities;              /* All entities */
411         struct uvc_entity *processing;          /* Processing unit */
412         struct uvc_entity *selector;            /* Selector unit */
413
414         struct mutex ctrl_mutex;
415 };
416
417 struct uvc_streaming {
418         struct list_head list;
419         struct uvc_device *dev;
420         struct video_device *vdev;
421         struct uvc_video_chain *chain;
422         atomic_t active;
423
424         struct usb_interface *intf;
425         int intfnum;
426         __u16 maxpsize;
427
428         struct uvc_streaming_header header;
429         enum v4l2_buf_type type;
430
431         unsigned int nformats;
432         struct uvc_format *format;
433
434         struct uvc_streaming_control ctrl;
435         struct uvc_format *cur_format;
436         struct uvc_frame *cur_frame;
437
438         struct mutex mutex;
439
440         unsigned int frozen : 1;
441         struct uvc_video_queue queue;
442         void (*decode) (struct urb *urb, struct uvc_streaming *video,
443                         struct uvc_buffer *buf);
444
445         /* Context data used by the bulk completion handler. */
446         struct {
447                 __u8 header[256];
448                 unsigned int header_size;
449                 int skip_payload;
450                 __u32 payload_size;
451                 __u32 max_payload_size;
452         } bulk;
453
454         struct urb *urb[UVC_URBS];
455         char *urb_buffer[UVC_URBS];
456         dma_addr_t urb_dma[UVC_URBS];
457         unsigned int urb_size;
458
459         __u8 last_fid;
460 };
461
462 enum uvc_device_state {
463         UVC_DEV_DISCONNECTED = 1,
464 };
465
466 struct uvc_device {
467         struct usb_device *udev;
468         struct usb_interface *intf;
469         unsigned long warnings;
470         __u32 quirks;
471         int intfnum;
472         char name[32];
473
474         enum uvc_device_state state;
475         struct list_head list;
476         atomic_t users;
477
478         /* Video control interface */
479         __u16 uvc_version;
480         __u32 clock_frequency;
481
482         struct list_head entities;
483         struct list_head chains;
484
485         /* Video Streaming interfaces */
486         struct list_head streams;
487         atomic_t nstreams;
488
489         /* Status Interrupt Endpoint */
490         struct usb_host_endpoint *int_ep;
491         struct urb *int_urb;
492         __u8 *status;
493         struct input_dev *input;
494         char input_phys[64];
495 };
496
497 enum uvc_handle_state {
498         UVC_HANDLE_PASSIVE      = 0,
499         UVC_HANDLE_ACTIVE       = 1,
500 };
501
502 struct uvc_fh {
503         struct uvc_video_chain *chain;
504         struct uvc_streaming *stream;
505         enum uvc_handle_state state;
506 };
507
508 struct uvc_driver {
509         struct usb_driver driver;
510
511         struct list_head devices;       /* struct uvc_device list */
512         struct list_head controls;      /* struct uvc_control_info list */
513         struct mutex ctrl_mutex;        /* protects controls and devices
514                                            lists */
515 };
516
517 /* ------------------------------------------------------------------------
518  * Debugging, printing and logging
519  */
520
521 #define UVC_TRACE_PROBE         (1 << 0)
522 #define UVC_TRACE_DESCR         (1 << 1)
523 #define UVC_TRACE_CONTROL       (1 << 2)
524 #define UVC_TRACE_FORMAT        (1 << 3)
525 #define UVC_TRACE_CAPTURE       (1 << 4)
526 #define UVC_TRACE_CALLS         (1 << 5)
527 #define UVC_TRACE_IOCTL         (1 << 6)
528 #define UVC_TRACE_FRAME         (1 << 7)
529 #define UVC_TRACE_SUSPEND       (1 << 8)
530 #define UVC_TRACE_STATUS        (1 << 9)
531 #define UVC_TRACE_VIDEO         (1 << 10)
532
533 #define UVC_WARN_MINMAX         0
534 #define UVC_WARN_PROBE_DEF      1
535
536 extern unsigned int uvc_clock_param;
537 extern unsigned int uvc_no_drop_param;
538 extern unsigned int uvc_trace_param;
539 extern unsigned int uvc_timeout_param;
540
541 #define uvc_trace(flag, msg...) \
542         do { \
543                 if (uvc_trace_param & flag) \
544                         printk(KERN_DEBUG "uvcvideo: " msg); \
545         } while (0)
546
547 #define uvc_warn_once(dev, warn, msg...) \
548         do { \
549                 if (!test_and_set_bit(warn, &dev->warnings)) \
550                         printk(KERN_INFO "uvcvideo: " msg); \
551         } while (0)
552
553 #define uvc_printk(level, msg...) \
554         printk(level "uvcvideo: " msg)
555
556 #define UVC_GUID_FORMAT "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-" \
557                         "%02x%02x%02x%02x%02x%02x"
558 #define UVC_GUID_ARGS(guid) \
559         (guid)[3],  (guid)[2],  (guid)[1],  (guid)[0], \
560         (guid)[5],  (guid)[4], \
561         (guid)[7],  (guid)[6], \
562         (guid)[8],  (guid)[9], \
563         (guid)[10], (guid)[11], (guid)[12], \
564         (guid)[13], (guid)[14], (guid)[15]
565
566 /* --------------------------------------------------------------------------
567  * Internal functions.
568  */
569
570 /* Core driver */
571 extern struct uvc_driver uvc_driver;
572
573 /* Video buffers queue management. */
574 extern void uvc_queue_init(struct uvc_video_queue *queue,
575                 enum v4l2_buf_type type);
576 extern int uvc_alloc_buffers(struct uvc_video_queue *queue,
577                 unsigned int nbuffers, unsigned int buflength);
578 extern int uvc_free_buffers(struct uvc_video_queue *queue);
579 extern int uvc_query_buffer(struct uvc_video_queue *queue,
580                 struct v4l2_buffer *v4l2_buf);
581 extern int uvc_queue_buffer(struct uvc_video_queue *queue,
582                 struct v4l2_buffer *v4l2_buf);
583 extern int uvc_dequeue_buffer(struct uvc_video_queue *queue,
584                 struct v4l2_buffer *v4l2_buf, int nonblocking);
585 extern int uvc_queue_enable(struct uvc_video_queue *queue, int enable);
586 extern void uvc_queue_cancel(struct uvc_video_queue *queue, int disconnect);
587 extern struct uvc_buffer *uvc_queue_next_buffer(struct uvc_video_queue *queue,
588                 struct uvc_buffer *buf);
589 extern unsigned int uvc_queue_poll(struct uvc_video_queue *queue,
590                 struct file *file, poll_table *wait);
591 extern int uvc_queue_allocated(struct uvc_video_queue *queue);
592 static inline int uvc_queue_streaming(struct uvc_video_queue *queue)
593 {
594         return queue->flags & UVC_QUEUE_STREAMING;
595 }
596
597 /* V4L2 interface */
598 extern const struct v4l2_file_operations uvc_fops;
599
600 /* Video */
601 extern int uvc_video_init(struct uvc_streaming *stream);
602 extern int uvc_video_suspend(struct uvc_streaming *stream);
603 extern int uvc_video_resume(struct uvc_streaming *stream);
604 extern int uvc_video_enable(struct uvc_streaming *stream, int enable);
605 extern int uvc_probe_video(struct uvc_streaming *stream,
606                 struct uvc_streaming_control *probe);
607 extern int uvc_commit_video(struct uvc_streaming *stream,
608                 struct uvc_streaming_control *ctrl);
609 extern int uvc_query_ctrl(struct uvc_device *dev, __u8 query, __u8 unit,
610                 __u8 intfnum, __u8 cs, void *data, __u16 size);
611
612 /* Status */
613 extern int uvc_status_init(struct uvc_device *dev);
614 extern void uvc_status_cleanup(struct uvc_device *dev);
615 extern int uvc_status_start(struct uvc_device *dev);
616 extern void uvc_status_stop(struct uvc_device *dev);
617 extern int uvc_status_suspend(struct uvc_device *dev);
618 extern int uvc_status_resume(struct uvc_device *dev);
619
620 /* Controls */
621 extern struct uvc_control *uvc_find_control(struct uvc_video_chain *chain,
622                 __u32 v4l2_id, struct uvc_control_mapping **mapping);
623 extern int uvc_query_v4l2_ctrl(struct uvc_video_chain *chain,
624                 struct v4l2_queryctrl *v4l2_ctrl);
625
626 extern int uvc_ctrl_add_info(struct uvc_control_info *info);
627 extern int uvc_ctrl_add_mapping(struct uvc_control_mapping *mapping);
628 extern int uvc_ctrl_init_device(struct uvc_device *dev);
629 extern void uvc_ctrl_cleanup_device(struct uvc_device *dev);
630 extern int uvc_ctrl_resume_device(struct uvc_device *dev);
631 extern void uvc_ctrl_init(void);
632
633 extern int uvc_ctrl_begin(struct uvc_video_chain *chain);
634 extern int __uvc_ctrl_commit(struct uvc_video_chain *chain, int rollback);
635 static inline int uvc_ctrl_commit(struct uvc_video_chain *chain)
636 {
637         return __uvc_ctrl_commit(chain, 0);
638 }
639 static inline int uvc_ctrl_rollback(struct uvc_video_chain *chain)
640 {
641         return __uvc_ctrl_commit(chain, 1);
642 }
643
644 extern int uvc_ctrl_get(struct uvc_video_chain *chain,
645                 struct v4l2_ext_control *xctrl);
646 extern int uvc_ctrl_set(struct uvc_video_chain *chain,
647                 struct v4l2_ext_control *xctrl);
648
649 extern int uvc_xu_ctrl_query(struct uvc_video_chain *chain,
650                 struct uvc_xu_control *ctrl, int set);
651
652 /* Utility functions */
653 extern void uvc_simplify_fraction(uint32_t *numerator, uint32_t *denominator,
654                 unsigned int n_terms, unsigned int threshold);
655 extern uint32_t uvc_fraction_to_interval(uint32_t numerator,
656                 uint32_t denominator);
657 extern struct usb_host_endpoint *uvc_find_endpoint(
658                 struct usb_host_interface *alts, __u8 epaddr);
659
660 /* Quirks support */
661 void uvc_video_decode_isight(struct urb *urb, struct uvc_streaming *stream,
662                 struct uvc_buffer *buf);
663
664 #endif /* __KERNEL__ */
665
666 #endif
667