Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-2.6
[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_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_BY8 \
135         { 'B',  'Y',  '8',  ' ', 0x00, 0x00, 0x10, 0x00, \
136          0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
137
138
139 /* ------------------------------------------------------------------------
140  * Driver specific constants.
141  */
142
143 #define DRIVER_VERSION_NUMBER   KERNEL_VERSION(0, 1, 0)
144
145 /* Number of isochronous URBs. */
146 #define UVC_URBS                5
147 /* Maximum number of packets per URB. */
148 #define UVC_MAX_PACKETS         32
149 /* Maximum number of video buffers. */
150 #define UVC_MAX_VIDEO_BUFFERS   32
151 /* Maximum status buffer size in bytes of interrupt URB. */
152 #define UVC_MAX_STATUS_SIZE     16
153
154 #define UVC_CTRL_CONTROL_TIMEOUT        300
155 #define UVC_CTRL_STREAMING_TIMEOUT      5000
156
157 /* Devices quirks */
158 #define UVC_QUIRK_STATUS_INTERVAL       0x00000001
159 #define UVC_QUIRK_PROBE_MINMAX          0x00000002
160 #define UVC_QUIRK_PROBE_EXTRAFIELDS     0x00000004
161 #define UVC_QUIRK_BUILTIN_ISIGHT        0x00000008
162 #define UVC_QUIRK_STREAM_NO_FID         0x00000010
163 #define UVC_QUIRK_IGNORE_SELECTOR_UNIT  0x00000020
164 #define UVC_QUIRK_FIX_BANDWIDTH         0x00000080
165 #define UVC_QUIRK_PROBE_DEF             0x00000100
166
167 /* Format flags */
168 #define UVC_FMT_FLAG_COMPRESSED         0x00000001
169 #define UVC_FMT_FLAG_STREAM             0x00000002
170
171 /* ------------------------------------------------------------------------
172  * Structures.
173  */
174
175 struct uvc_device;
176
177 /* TODO: Put the most frequently accessed fields at the beginning of
178  * structures to maximize cache efficiency.
179  */
180 struct uvc_streaming_control {
181         __u16 bmHint;
182         __u8  bFormatIndex;
183         __u8  bFrameIndex;
184         __u32 dwFrameInterval;
185         __u16 wKeyFrameRate;
186         __u16 wPFrameRate;
187         __u16 wCompQuality;
188         __u16 wCompWindowSize;
189         __u16 wDelay;
190         __u32 dwMaxVideoFrameSize;
191         __u32 dwMaxPayloadTransferSize;
192         __u32 dwClockFrequency;
193         __u8  bmFramingInfo;
194         __u8  bPreferedVersion;
195         __u8  bMinVersion;
196         __u8  bMaxVersion;
197 };
198
199 struct uvc_menu_info {
200         __u32 value;
201         __u8 name[32];
202 };
203
204 struct uvc_control_info {
205         struct list_head list;
206         struct list_head mappings;
207
208         __u8 entity[16];
209         __u8 index;
210         __u8 selector;
211
212         __u16 size;
213         __u32 flags;
214 };
215
216 struct uvc_control_mapping {
217         struct list_head list;
218
219         struct uvc_control_info *ctrl;
220
221         __u32 id;
222         __u8 name[32];
223         __u8 entity[16];
224         __u8 selector;
225
226         __u8 size;
227         __u8 offset;
228         enum v4l2_ctrl_type v4l2_type;
229         __u32 data_type;
230
231         struct uvc_menu_info *menu_info;
232         __u32 menu_count;
233
234         __s32 (*get) (struct uvc_control_mapping *mapping, __u8 query,
235                       const __u8 *data);
236         void (*set) (struct uvc_control_mapping *mapping, __s32 value,
237                      __u8 *data);
238 };
239
240 struct uvc_control {
241         struct uvc_entity *entity;
242         struct uvc_control_info *info;
243
244         __u8 index;     /* Used to match the uvc_control entry with a
245                            uvc_control_info. */
246         __u8 dirty : 1,
247              loaded : 1,
248              modified : 1,
249              cached : 1;
250
251         __u8 *data;
252 };
253
254 struct uvc_format_desc {
255         char *name;
256         __u8 guid[16];
257         __u32 fcc;
258 };
259
260 /* The term 'entity' refers to both UVC units and UVC terminals.
261  *
262  * The type field is either the terminal type (wTerminalType in the terminal
263  * descriptor), or the unit type (bDescriptorSubtype in the unit descriptor).
264  * As the bDescriptorSubtype field is one byte long, the type value will
265  * always have a null MSB for units. All terminal types defined by the UVC
266  * specification have a non-null MSB, so it is safe to use the MSB to
267  * differentiate between units and terminals as long as the descriptor parsing
268  * code makes sure terminal types have a non-null MSB.
269  *
270  * For terminals, the type's most significant bit stores the terminal
271  * direction (either UVC_TERM_INPUT or UVC_TERM_OUTPUT). The type field should
272  * always be accessed with the UVC_ENTITY_* macros and never directly.
273  */
274
275 struct uvc_entity {
276         struct list_head list;          /* Entity as part of a UVC device. */
277         struct list_head chain;         /* Entity as part of a video device
278                                          * chain. */
279         __u8 id;
280         __u16 type;
281         char name[64];
282
283         union {
284                 struct {
285                         __u16 wObjectiveFocalLengthMin;
286                         __u16 wObjectiveFocalLengthMax;
287                         __u16 wOcularFocalLength;
288                         __u8  bControlSize;
289                         __u8  *bmControls;
290                 } camera;
291
292                 struct {
293                         __u8  bControlSize;
294                         __u8  *bmControls;
295                         __u8  bTransportModeSize;
296                         __u8  *bmTransportModes;
297                 } media;
298
299                 struct {
300                 } output;
301
302                 struct {
303                         __u16 wMaxMultiplier;
304                         __u8  bControlSize;
305                         __u8  *bmControls;
306                         __u8  bmVideoStandards;
307                 } processing;
308
309                 struct {
310                 } selector;
311
312                 struct {
313                         __u8  guidExtensionCode[16];
314                         __u8  bNumControls;
315                         __u8  bControlSize;
316                         __u8  *bmControls;
317                         __u8  *bmControlsType;
318                 } extension;
319         };
320
321         __u8 bNrInPins;
322         __u8 *baSourceID;
323
324         unsigned int ncontrols;
325         struct uvc_control *controls;
326 };
327
328 struct uvc_frame {
329         __u8  bFrameIndex;
330         __u8  bmCapabilities;
331         __u16 wWidth;
332         __u16 wHeight;
333         __u32 dwMinBitRate;
334         __u32 dwMaxBitRate;
335         __u32 dwMaxVideoFrameBufferSize;
336         __u8  bFrameIntervalType;
337         __u32 dwDefaultFrameInterval;
338         __u32 *dwFrameInterval;
339 };
340
341 struct uvc_format {
342         __u8 type;
343         __u8 index;
344         __u8 bpp;
345         __u8 colorspace;
346         __u32 fcc;
347         __u32 flags;
348
349         char name[32];
350
351         unsigned int nframes;
352         struct uvc_frame *frame;
353 };
354
355 struct uvc_streaming_header {
356         __u8 bNumFormats;
357         __u8 bEndpointAddress;
358         __u8 bTerminalLink;
359         __u8 bControlSize;
360         __u8 *bmaControls;
361         /* The following fields are used by input headers only. */
362         __u8 bmInfo;
363         __u8 bStillCaptureMethod;
364         __u8 bTriggerSupport;
365         __u8 bTriggerUsage;
366 };
367
368 enum uvc_buffer_state {
369         UVC_BUF_STATE_IDLE      = 0,
370         UVC_BUF_STATE_QUEUED    = 1,
371         UVC_BUF_STATE_ACTIVE    = 2,
372         UVC_BUF_STATE_READY     = 3,
373         UVC_BUF_STATE_DONE      = 4,
374         UVC_BUF_STATE_ERROR     = 5,
375 };
376
377 struct uvc_buffer {
378         unsigned long vma_use_count;
379         struct list_head stream;
380
381         /* Touched by interrupt handler. */
382         struct v4l2_buffer buf;
383         struct list_head queue;
384         wait_queue_head_t wait;
385         enum uvc_buffer_state state;
386 };
387
388 #define UVC_QUEUE_STREAMING             (1 << 0)
389 #define UVC_QUEUE_DISCONNECTED          (1 << 1)
390 #define UVC_QUEUE_DROP_INCOMPLETE       (1 << 2)
391
392 struct uvc_video_queue {
393         enum v4l2_buf_type type;
394
395         void *mem;
396         unsigned int flags;
397         __u32 sequence;
398
399         unsigned int count;
400         unsigned int buf_size;
401         unsigned int buf_used;
402         struct uvc_buffer buffer[UVC_MAX_VIDEO_BUFFERS];
403         struct mutex mutex;     /* protects buffers and mainqueue */
404         spinlock_t irqlock;     /* protects irqqueue */
405
406         struct list_head mainqueue;
407         struct list_head irqqueue;
408 };
409
410 struct uvc_video_chain {
411         struct uvc_device *dev;
412         struct list_head list;
413
414         struct list_head entities;              /* All entities */
415         struct uvc_entity *processing;          /* Processing unit */
416         struct uvc_entity *selector;            /* Selector unit */
417
418         struct mutex ctrl_mutex;
419 };
420
421 struct uvc_streaming {
422         struct list_head list;
423         struct uvc_device *dev;
424         struct video_device *vdev;
425         struct uvc_video_chain *chain;
426         atomic_t active;
427
428         struct usb_interface *intf;
429         int intfnum;
430         __u16 maxpsize;
431
432         struct uvc_streaming_header header;
433         enum v4l2_buf_type type;
434
435         unsigned int nformats;
436         struct uvc_format *format;
437
438         struct uvc_streaming_control ctrl;
439         struct uvc_format *cur_format;
440         struct uvc_frame *cur_frame;
441
442         struct mutex mutex;
443
444         unsigned int frozen : 1;
445         struct uvc_video_queue queue;
446         void (*decode) (struct urb *urb, struct uvc_streaming *video,
447                         struct uvc_buffer *buf);
448
449         /* Context data used by the bulk completion handler. */
450         struct {
451                 __u8 header[256];
452                 unsigned int header_size;
453                 int skip_payload;
454                 __u32 payload_size;
455                 __u32 max_payload_size;
456         } bulk;
457
458         struct urb *urb[UVC_URBS];
459         char *urb_buffer[UVC_URBS];
460         dma_addr_t urb_dma[UVC_URBS];
461         unsigned int urb_size;
462
463         __u8 last_fid;
464 };
465
466 enum uvc_device_state {
467         UVC_DEV_DISCONNECTED = 1,
468 };
469
470 struct uvc_device {
471         struct usb_device *udev;
472         struct usb_interface *intf;
473         unsigned long warnings;
474         __u32 quirks;
475         int intfnum;
476         char name[32];
477
478         enum uvc_device_state state;
479         struct list_head list;
480         atomic_t users;
481
482         /* Video control interface */
483         __u16 uvc_version;
484         __u32 clock_frequency;
485
486         struct list_head entities;
487         struct list_head chains;
488
489         /* Video Streaming interfaces */
490         struct list_head streams;
491         atomic_t nstreams;
492
493         /* Status Interrupt Endpoint */
494         struct usb_host_endpoint *int_ep;
495         struct urb *int_urb;
496         __u8 *status;
497         struct input_dev *input;
498         char input_phys[64];
499 };
500
501 enum uvc_handle_state {
502         UVC_HANDLE_PASSIVE      = 0,
503         UVC_HANDLE_ACTIVE       = 1,
504 };
505
506 struct uvc_fh {
507         struct uvc_video_chain *chain;
508         struct uvc_streaming *stream;
509         enum uvc_handle_state state;
510 };
511
512 struct uvc_driver {
513         struct usb_driver driver;
514
515         struct list_head devices;       /* struct uvc_device list */
516         struct list_head controls;      /* struct uvc_control_info list */
517         struct mutex ctrl_mutex;        /* protects controls and devices
518                                            lists */
519 };
520
521 /* ------------------------------------------------------------------------
522  * Debugging, printing and logging
523  */
524
525 #define UVC_TRACE_PROBE         (1 << 0)
526 #define UVC_TRACE_DESCR         (1 << 1)
527 #define UVC_TRACE_CONTROL       (1 << 2)
528 #define UVC_TRACE_FORMAT        (1 << 3)
529 #define UVC_TRACE_CAPTURE       (1 << 4)
530 #define UVC_TRACE_CALLS         (1 << 5)
531 #define UVC_TRACE_IOCTL         (1 << 6)
532 #define UVC_TRACE_FRAME         (1 << 7)
533 #define UVC_TRACE_SUSPEND       (1 << 8)
534 #define UVC_TRACE_STATUS        (1 << 9)
535 #define UVC_TRACE_VIDEO         (1 << 10)
536
537 #define UVC_WARN_MINMAX         0
538 #define UVC_WARN_PROBE_DEF      1
539
540 extern unsigned int uvc_clock_param;
541 extern unsigned int uvc_no_drop_param;
542 extern unsigned int uvc_trace_param;
543 extern unsigned int uvc_timeout_param;
544
545 #define uvc_trace(flag, msg...) \
546         do { \
547                 if (uvc_trace_param & flag) \
548                         printk(KERN_DEBUG "uvcvideo: " msg); \
549         } while (0)
550
551 #define uvc_warn_once(dev, warn, msg...) \
552         do { \
553                 if (!test_and_set_bit(warn, &dev->warnings)) \
554                         printk(KERN_INFO "uvcvideo: " msg); \
555         } while (0)
556
557 #define uvc_printk(level, msg...) \
558         printk(level "uvcvideo: " msg)
559
560 /* --------------------------------------------------------------------------
561  * Internal functions.
562  */
563
564 /* Core driver */
565 extern struct uvc_driver uvc_driver;
566
567 /* Video buffers queue management. */
568 extern void uvc_queue_init(struct uvc_video_queue *queue,
569                 enum v4l2_buf_type type);
570 extern int uvc_alloc_buffers(struct uvc_video_queue *queue,
571                 unsigned int nbuffers, unsigned int buflength);
572 extern int uvc_free_buffers(struct uvc_video_queue *queue);
573 extern int uvc_query_buffer(struct uvc_video_queue *queue,
574                 struct v4l2_buffer *v4l2_buf);
575 extern int uvc_queue_buffer(struct uvc_video_queue *queue,
576                 struct v4l2_buffer *v4l2_buf);
577 extern int uvc_dequeue_buffer(struct uvc_video_queue *queue,
578                 struct v4l2_buffer *v4l2_buf, int nonblocking);
579 extern int uvc_queue_enable(struct uvc_video_queue *queue, int enable);
580 extern void uvc_queue_cancel(struct uvc_video_queue *queue, int disconnect);
581 extern struct uvc_buffer *uvc_queue_next_buffer(struct uvc_video_queue *queue,
582                 struct uvc_buffer *buf);
583 extern unsigned int uvc_queue_poll(struct uvc_video_queue *queue,
584                 struct file *file, poll_table *wait);
585 extern int uvc_queue_allocated(struct uvc_video_queue *queue);
586 static inline int uvc_queue_streaming(struct uvc_video_queue *queue)
587 {
588         return queue->flags & UVC_QUEUE_STREAMING;
589 }
590
591 /* V4L2 interface */
592 extern const struct v4l2_file_operations uvc_fops;
593
594 /* Video */
595 extern int uvc_video_init(struct uvc_streaming *stream);
596 extern int uvc_video_suspend(struct uvc_streaming *stream);
597 extern int uvc_video_resume(struct uvc_streaming *stream);
598 extern int uvc_video_enable(struct uvc_streaming *stream, int enable);
599 extern int uvc_probe_video(struct uvc_streaming *stream,
600                 struct uvc_streaming_control *probe);
601 extern int uvc_commit_video(struct uvc_streaming *stream,
602                 struct uvc_streaming_control *ctrl);
603 extern int uvc_query_ctrl(struct uvc_device *dev, __u8 query, __u8 unit,
604                 __u8 intfnum, __u8 cs, void *data, __u16 size);
605
606 /* Status */
607 extern int uvc_status_init(struct uvc_device *dev);
608 extern void uvc_status_cleanup(struct uvc_device *dev);
609 extern int uvc_status_start(struct uvc_device *dev);
610 extern void uvc_status_stop(struct uvc_device *dev);
611 extern int uvc_status_suspend(struct uvc_device *dev);
612 extern int uvc_status_resume(struct uvc_device *dev);
613
614 /* Controls */
615 extern struct uvc_control *uvc_find_control(struct uvc_video_chain *chain,
616                 __u32 v4l2_id, struct uvc_control_mapping **mapping);
617 extern int uvc_query_v4l2_ctrl(struct uvc_video_chain *chain,
618                 struct v4l2_queryctrl *v4l2_ctrl);
619
620 extern int uvc_ctrl_add_info(struct uvc_control_info *info);
621 extern int uvc_ctrl_add_mapping(struct uvc_control_mapping *mapping);
622 extern int uvc_ctrl_init_device(struct uvc_device *dev);
623 extern void uvc_ctrl_cleanup_device(struct uvc_device *dev);
624 extern int uvc_ctrl_resume_device(struct uvc_device *dev);
625 extern void uvc_ctrl_init(void);
626
627 extern int uvc_ctrl_begin(struct uvc_video_chain *chain);
628 extern int __uvc_ctrl_commit(struct uvc_video_chain *chain, int rollback);
629 static inline int uvc_ctrl_commit(struct uvc_video_chain *chain)
630 {
631         return __uvc_ctrl_commit(chain, 0);
632 }
633 static inline int uvc_ctrl_rollback(struct uvc_video_chain *chain)
634 {
635         return __uvc_ctrl_commit(chain, 1);
636 }
637
638 extern int uvc_ctrl_get(struct uvc_video_chain *chain,
639                 struct v4l2_ext_control *xctrl);
640 extern int uvc_ctrl_set(struct uvc_video_chain *chain,
641                 struct v4l2_ext_control *xctrl);
642
643 extern int uvc_xu_ctrl_query(struct uvc_video_chain *chain,
644                 struct uvc_xu_control *ctrl, int set);
645
646 /* Utility functions */
647 extern void uvc_simplify_fraction(uint32_t *numerator, uint32_t *denominator,
648                 unsigned int n_terms, unsigned int threshold);
649 extern uint32_t uvc_fraction_to_interval(uint32_t numerator,
650                 uint32_t denominator);
651 extern struct usb_host_endpoint *uvc_find_endpoint(
652                 struct usb_host_interface *alts, __u8 epaddr);
653
654 /* Quirks support */
655 void uvc_video_decode_isight(struct urb *urb, struct uvc_streaming *stream,
656                 struct uvc_buffer *buf);
657
658 #endif /* __KERNEL__ */
659
660 #endif
661