V4L/DVB (12379): uvcvideo: Multiple streaming interfaces support
[safe/jmp/linux-2.6] / 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
79 #define UVC_ENTITY_TYPE(entity)         ((entity)->type & 0x7fff)
80 #define UVC_ENTITY_IS_UNIT(entity)      (((entity)->type & 0xff00) == 0)
81 #define UVC_ENTITY_IS_TERM(entity)      (((entity)->type & 0xff00) != 0)
82 #define UVC_ENTITY_IS_ITERM(entity) \
83         (UVC_ENTITY_IS_TERM(entity) && \
84         ((entity)->type & 0x8000) == UVC_TERM_INPUT)
85 #define UVC_ENTITY_IS_OTERM(entity) \
86         (UVC_ENTITY_IS_TERM(entity) && \
87         ((entity)->type & 0x8000) == UVC_TERM_OUTPUT)
88
89
90 /* ------------------------------------------------------------------------
91  * GUIDs
92  */
93 #define UVC_GUID_UVC_CAMERA \
94         {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, \
95          0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01}
96 #define UVC_GUID_UVC_OUTPUT \
97         {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, \
98          0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02}
99 #define UVC_GUID_UVC_MEDIA_TRANSPORT_INPUT \
100         {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, \
101          0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x03}
102 #define UVC_GUID_UVC_PROCESSING \
103         {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, \
104          0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x01}
105 #define UVC_GUID_UVC_SELECTOR \
106         {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, \
107          0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x02}
108
109 #define UVC_GUID_FORMAT_MJPEG \
110         { 'M',  'J',  'P',  'G', 0x00, 0x00, 0x10, 0x00, \
111          0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
112 #define UVC_GUID_FORMAT_YUY2 \
113         { 'Y',  'U',  'Y',  '2', 0x00, 0x00, 0x10, 0x00, \
114          0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
115 #define UVC_GUID_FORMAT_NV12 \
116         { 'N',  'V',  '1',  '2', 0x00, 0x00, 0x10, 0x00, \
117          0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
118 #define UVC_GUID_FORMAT_YV12 \
119         { 'Y',  'V',  '1',  '2', 0x00, 0x00, 0x10, 0x00, \
120          0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
121 #define UVC_GUID_FORMAT_I420 \
122         { 'I',  '4',  '2',  '0', 0x00, 0x00, 0x10, 0x00, \
123          0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
124 #define UVC_GUID_FORMAT_UYVY \
125         { 'U',  'Y',  'V',  'Y', 0x00, 0x00, 0x10, 0x00, \
126          0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
127 #define UVC_GUID_FORMAT_Y800 \
128         { 'Y',  '8',  '0',  '0', 0x00, 0x00, 0x10, 0x00, \
129          0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
130 #define UVC_GUID_FORMAT_BY8 \
131         { 'B',  'Y',  '8',  ' ', 0x00, 0x00, 0x10, 0x00, \
132          0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
133
134
135 /* ------------------------------------------------------------------------
136  * Driver specific constants.
137  */
138
139 #define DRIVER_VERSION_NUMBER   KERNEL_VERSION(0, 1, 0)
140
141 /* Number of isochronous URBs. */
142 #define UVC_URBS                5
143 /* Maximum number of packets per URB. */
144 #define UVC_MAX_PACKETS         32
145 /* Maximum number of video buffers. */
146 #define UVC_MAX_VIDEO_BUFFERS   32
147 /* Maximum status buffer size in bytes of interrupt URB. */
148 #define UVC_MAX_STATUS_SIZE     16
149
150 #define UVC_CTRL_CONTROL_TIMEOUT        300
151 #define UVC_CTRL_STREAMING_TIMEOUT      1000
152
153 /* Devices quirks */
154 #define UVC_QUIRK_STATUS_INTERVAL       0x00000001
155 #define UVC_QUIRK_PROBE_MINMAX          0x00000002
156 #define UVC_QUIRK_PROBE_EXTRAFIELDS     0x00000004
157 #define UVC_QUIRK_BUILTIN_ISIGHT        0x00000008
158 #define UVC_QUIRK_STREAM_NO_FID         0x00000010
159 #define UVC_QUIRK_IGNORE_SELECTOR_UNIT  0x00000020
160 #define UVC_QUIRK_FIX_BANDWIDTH         0x00000080
161 #define UVC_QUIRK_PROBE_DEF             0x00000100
162
163 /* Format flags */
164 #define UVC_FMT_FLAG_COMPRESSED         0x00000001
165 #define UVC_FMT_FLAG_STREAM             0x00000002
166
167 /* ------------------------------------------------------------------------
168  * Structures.
169  */
170
171 struct uvc_device;
172
173 /* TODO: Put the most frequently accessed fields at the beginning of
174  * structures to maximize cache efficiency.
175  */
176 struct uvc_streaming_control {
177         __u16 bmHint;
178         __u8  bFormatIndex;
179         __u8  bFrameIndex;
180         __u32 dwFrameInterval;
181         __u16 wKeyFrameRate;
182         __u16 wPFrameRate;
183         __u16 wCompQuality;
184         __u16 wCompWindowSize;
185         __u16 wDelay;
186         __u32 dwMaxVideoFrameSize;
187         __u32 dwMaxPayloadTransferSize;
188         __u32 dwClockFrequency;
189         __u8  bmFramingInfo;
190         __u8  bPreferedVersion;
191         __u8  bMinVersion;
192         __u8  bMaxVersion;
193 };
194
195 struct uvc_menu_info {
196         __u32 value;
197         __u8 name[32];
198 };
199
200 struct uvc_control_info {
201         struct list_head list;
202         struct list_head mappings;
203
204         __u8 entity[16];
205         __u8 index;
206         __u8 selector;
207
208         __u16 size;
209         __u32 flags;
210 };
211
212 struct uvc_control_mapping {
213         struct list_head list;
214
215         struct uvc_control_info *ctrl;
216
217         __u32 id;
218         __u8 name[32];
219         __u8 entity[16];
220         __u8 selector;
221
222         __u8 size;
223         __u8 offset;
224         enum v4l2_ctrl_type v4l2_type;
225         __u32 data_type;
226
227         struct uvc_menu_info *menu_info;
228         __u32 menu_count;
229
230         __s32 (*get) (struct uvc_control_mapping *mapping, __u8 query,
231                       const __u8 *data);
232         void (*set) (struct uvc_control_mapping *mapping, __s32 value,
233                      __u8 *data);
234 };
235
236 struct uvc_control {
237         struct uvc_entity *entity;
238         struct uvc_control_info *info;
239
240         __u8 index;     /* Used to match the uvc_control entry with a
241                            uvc_control_info. */
242         __u8 dirty : 1,
243              loaded : 1,
244              modified : 1;
245
246         __u8 *data;
247 };
248
249 struct uvc_format_desc {
250         char *name;
251         __u8 guid[16];
252         __u32 fcc;
253 };
254
255 /* The term 'entity' refers to both UVC units and UVC terminals.
256  *
257  * The type field is either the terminal type (wTerminalType in the terminal
258  * descriptor), or the unit type (bDescriptorSubtype in the unit descriptor).
259  * As the bDescriptorSubtype field is one byte long, the type value will
260  * always have a null MSB for units. All terminal types defined by the UVC
261  * specification have a non-null MSB, so it is safe to use the MSB to
262  * differentiate between units and terminals as long as the descriptor parsing
263  * code makes sure terminal types have a non-null MSB.
264  *
265  * For terminals, the type's most significant bit stores the terminal
266  * direction (either UVC_TERM_INPUT or UVC_TERM_OUTPUT). The type field should
267  * always be accessed with the UVC_ENTITY_* macros and never directly.
268  */
269
270 struct uvc_entity {
271         struct list_head list;          /* Entity as part of a UVC device. */
272         struct list_head chain;         /* Entity as part of a video device
273                                          * chain. */
274         __u8 id;
275         __u16 type;
276         char name[64];
277
278         union {
279                 struct {
280                         __u16 wObjectiveFocalLengthMin;
281                         __u16 wObjectiveFocalLengthMax;
282                         __u16 wOcularFocalLength;
283                         __u8  bControlSize;
284                         __u8  *bmControls;
285                 } camera;
286
287                 struct {
288                         __u8  bControlSize;
289                         __u8  *bmControls;
290                         __u8  bTransportModeSize;
291                         __u8  *bmTransportModes;
292                 } media;
293
294                 struct {
295                         __u8  bSourceID;
296                 } output;
297
298                 struct {
299                         __u8  bSourceID;
300                         __u16 wMaxMultiplier;
301                         __u8  bControlSize;
302                         __u8  *bmControls;
303                         __u8  bmVideoStandards;
304                 } processing;
305
306                 struct {
307                         __u8  bNrInPins;
308                         __u8  *baSourceID;
309                 } selector;
310
311                 struct {
312                         __u8  guidExtensionCode[16];
313                         __u8  bNumControls;
314                         __u8  bNrInPins;
315                         __u8  *baSourceID;
316                         __u8  bControlSize;
317                         __u8  *bmControls;
318                         __u8  *bmControlsType;
319                 } extension;
320         };
321
322         unsigned int ncontrols;
323         struct uvc_control *controls;
324 };
325
326 struct uvc_frame {
327         __u8  bFrameIndex;
328         __u8  bmCapabilities;
329         __u16 wWidth;
330         __u16 wHeight;
331         __u32 dwMinBitRate;
332         __u32 dwMaxBitRate;
333         __u32 dwMaxVideoFrameBufferSize;
334         __u8  bFrameIntervalType;
335         __u32 dwDefaultFrameInterval;
336         __u32 *dwFrameInterval;
337 };
338
339 struct uvc_format {
340         __u8 type;
341         __u8 index;
342         __u8 bpp;
343         __u8 colorspace;
344         __u32 fcc;
345         __u32 flags;
346
347         char name[32];
348
349         unsigned int nframes;
350         struct uvc_frame *frame;
351 };
352
353 struct uvc_streaming_header {
354         __u8 bNumFormats;
355         __u8 bEndpointAddress;
356         __u8 bTerminalLink;
357         __u8 bControlSize;
358         __u8 *bmaControls;
359         /* The following fields are used by input headers only. */
360         __u8 bmInfo;
361         __u8 bStillCaptureMethod;
362         __u8 bTriggerSupport;
363         __u8 bTriggerUsage;
364 };
365
366 enum uvc_buffer_state {
367         UVC_BUF_STATE_IDLE      = 0,
368         UVC_BUF_STATE_QUEUED    = 1,
369         UVC_BUF_STATE_ACTIVE    = 2,
370         UVC_BUF_STATE_DONE      = 3,
371         UVC_BUF_STATE_ERROR     = 4,
372 };
373
374 struct uvc_buffer {
375         unsigned long vma_use_count;
376         struct list_head stream;
377
378         /* Touched by interrupt handler. */
379         struct v4l2_buffer buf;
380         struct list_head queue;
381         wait_queue_head_t wait;
382         enum uvc_buffer_state state;
383 };
384
385 #define UVC_QUEUE_STREAMING             (1 << 0)
386 #define UVC_QUEUE_DISCONNECTED          (1 << 1)
387 #define UVC_QUEUE_DROP_INCOMPLETE       (1 << 2)
388
389 struct uvc_video_queue {
390         enum v4l2_buf_type type;
391
392         void *mem;
393         unsigned int flags;
394         __u32 sequence;
395
396         unsigned int count;
397         unsigned int buf_size;
398         unsigned int buf_used;
399         struct uvc_buffer buffer[UVC_MAX_VIDEO_BUFFERS];
400         struct mutex mutex;     /* protects buffers and mainqueue */
401         spinlock_t irqlock;     /* protects irqqueue */
402
403         struct list_head mainqueue;
404         struct list_head irqqueue;
405 };
406
407 struct uvc_video_chain {
408         struct uvc_device *dev;
409         struct list_head list;
410
411         struct list_head iterms;                /* Input terminals */
412         struct list_head oterms;                /* Output terminals */
413         struct uvc_entity *processing;          /* Processing unit */
414         struct uvc_entity *selector;            /* Selector unit */
415         struct list_head extensions;            /* Extension units */
416
417         struct mutex ctrl_mutex;
418 };
419
420 struct uvc_streaming {
421         struct list_head list;
422         struct uvc_device *dev;
423         struct video_device *vdev;
424         struct uvc_video_chain *chain;
425         atomic_t active;
426
427         struct usb_interface *intf;
428         int intfnum;
429         __u16 maxpsize;
430
431         struct uvc_streaming_header header;
432         enum v4l2_buf_type type;
433
434         unsigned int nformats;
435         struct uvc_format *format;
436
437         struct uvc_streaming_control ctrl;
438         struct uvc_format *cur_format;
439         struct uvc_frame *cur_frame;
440
441         struct mutex mutex;
442
443         unsigned int frozen : 1;
444         struct uvc_video_queue queue;
445         void (*decode) (struct urb *urb, struct uvc_streaming *video,
446                         struct uvc_buffer *buf);
447
448         /* Context data used by the bulk completion handler. */
449         struct {
450                 __u8 header[256];
451                 unsigned int header_size;
452                 int skip_payload;
453                 __u32 payload_size;
454                 __u32 max_payload_size;
455         } bulk;
456
457         struct urb *urb[UVC_URBS];
458         char *urb_buffer[UVC_URBS];
459         dma_addr_t urb_dma[UVC_URBS];
460         unsigned int urb_size;
461
462         __u8 last_fid;
463 };
464
465 enum uvc_device_state {
466         UVC_DEV_DISCONNECTED = 1,
467 };
468
469 struct uvc_device {
470         struct usb_device *udev;
471         struct usb_interface *intf;
472         unsigned long warnings;
473         __u32 quirks;
474         int intfnum;
475         char name[32];
476
477         enum uvc_device_state state;
478         struct kref kref;
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
492         /* Status Interrupt Endpoint */
493         struct usb_host_endpoint *int_ep;
494         struct urb *int_urb;
495         __u8 *status;
496         struct input_dev *input;
497         char input_phys[64];
498 };
499
500 enum uvc_handle_state {
501         UVC_HANDLE_PASSIVE      = 0,
502         UVC_HANDLE_ACTIVE       = 1,
503 };
504
505 struct uvc_fh {
506         struct uvc_video_chain *chain;
507         struct uvc_streaming *stream;
508         enum uvc_handle_state state;
509 };
510
511 struct uvc_driver {
512         struct usb_driver driver;
513
514         struct mutex open_mutex;        /* protects from open/disconnect race */
515
516         struct list_head devices;       /* struct uvc_device list */
517         struct list_head controls;      /* struct uvc_control_info list */
518         struct mutex ctrl_mutex;        /* protects controls and devices
519                                            lists */
520 };
521
522 /* ------------------------------------------------------------------------
523  * Debugging, printing and logging
524  */
525
526 #define UVC_TRACE_PROBE         (1 << 0)
527 #define UVC_TRACE_DESCR         (1 << 1)
528 #define UVC_TRACE_CONTROL       (1 << 2)
529 #define UVC_TRACE_FORMAT        (1 << 3)
530 #define UVC_TRACE_CAPTURE       (1 << 4)
531 #define UVC_TRACE_CALLS         (1 << 5)
532 #define UVC_TRACE_IOCTL         (1 << 6)
533 #define UVC_TRACE_FRAME         (1 << 7)
534 #define UVC_TRACE_SUSPEND       (1 << 8)
535 #define UVC_TRACE_STATUS        (1 << 9)
536
537 #define UVC_WARN_MINMAX         0
538 #define UVC_WARN_PROBE_DEF      1
539
540 extern unsigned int uvc_no_drop_param;
541 extern unsigned int uvc_trace_param;
542
543 #define uvc_trace(flag, msg...) \
544         do { \
545                 if (uvc_trace_param & flag) \
546                         printk(KERN_DEBUG "uvcvideo: " msg); \
547         } while (0)
548
549 #define uvc_warn_once(dev, warn, msg...) \
550         do { \
551                 if (!test_and_set_bit(warn, &dev->warnings)) \
552                         printk(KERN_INFO "uvcvideo: " msg); \
553         } while (0)
554
555 #define uvc_printk(level, msg...) \
556         printk(level "uvcvideo: " msg)
557
558 #define UVC_GUID_FORMAT "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-" \
559                         "%02x%02x%02x%02x%02x%02x"
560 #define UVC_GUID_ARGS(guid) \
561         (guid)[3],  (guid)[2],  (guid)[1],  (guid)[0], \
562         (guid)[5],  (guid)[4], \
563         (guid)[7],  (guid)[6], \
564         (guid)[8],  (guid)[9], \
565         (guid)[10], (guid)[11], (guid)[12], \
566         (guid)[13], (guid)[14], (guid)[15]
567
568 /* --------------------------------------------------------------------------
569  * Internal functions.
570  */
571
572 /* Core driver */
573 extern struct uvc_driver uvc_driver;
574 extern void uvc_delete(struct kref *kref);
575
576 /* Video buffers queue management. */
577 extern void uvc_queue_init(struct uvc_video_queue *queue,
578                 enum v4l2_buf_type type);
579 extern int uvc_alloc_buffers(struct uvc_video_queue *queue,
580                 unsigned int nbuffers, unsigned int buflength);
581 extern int uvc_free_buffers(struct uvc_video_queue *queue);
582 extern int uvc_query_buffer(struct uvc_video_queue *queue,
583                 struct v4l2_buffer *v4l2_buf);
584 extern int uvc_queue_buffer(struct uvc_video_queue *queue,
585                 struct v4l2_buffer *v4l2_buf);
586 extern int uvc_dequeue_buffer(struct uvc_video_queue *queue,
587                 struct v4l2_buffer *v4l2_buf, int nonblocking);
588 extern int uvc_queue_enable(struct uvc_video_queue *queue, int enable);
589 extern void uvc_queue_cancel(struct uvc_video_queue *queue, int disconnect);
590 extern struct uvc_buffer *uvc_queue_next_buffer(struct uvc_video_queue *queue,
591                 struct uvc_buffer *buf);
592 extern unsigned int uvc_queue_poll(struct uvc_video_queue *queue,
593                 struct file *file, poll_table *wait);
594 extern int uvc_queue_allocated(struct uvc_video_queue *queue);
595 static inline int uvc_queue_streaming(struct uvc_video_queue *queue)
596 {
597         return queue->flags & UVC_QUEUE_STREAMING;
598 }
599
600 /* V4L2 interface */
601 extern const struct v4l2_file_operations uvc_fops;
602
603 /* Video */
604 extern int uvc_video_init(struct uvc_streaming *stream);
605 extern int uvc_video_suspend(struct uvc_streaming *stream);
606 extern int uvc_video_resume(struct uvc_streaming *stream);
607 extern int uvc_video_enable(struct uvc_streaming *stream, int enable);
608 extern int uvc_probe_video(struct uvc_streaming *stream,
609                 struct uvc_streaming_control *probe);
610 extern int uvc_commit_video(struct uvc_streaming *stream,
611                 struct uvc_streaming_control *ctrl);
612 extern int uvc_query_ctrl(struct uvc_device *dev, __u8 query, __u8 unit,
613                 __u8 intfnum, __u8 cs, void *data, __u16 size);
614
615 /* Status */
616 extern int uvc_status_init(struct uvc_device *dev);
617 extern void uvc_status_cleanup(struct uvc_device *dev);
618 extern int uvc_status_start(struct uvc_device *dev);
619 extern void uvc_status_stop(struct uvc_device *dev);
620 extern int uvc_status_suspend(struct uvc_device *dev);
621 extern int uvc_status_resume(struct uvc_device *dev);
622
623 /* Controls */
624 extern struct uvc_control *uvc_find_control(struct uvc_video_chain *chain,
625                 __u32 v4l2_id, struct uvc_control_mapping **mapping);
626 extern int uvc_query_v4l2_ctrl(struct uvc_video_chain *chain,
627                 struct v4l2_queryctrl *v4l2_ctrl);
628
629 extern int uvc_ctrl_add_info(struct uvc_control_info *info);
630 extern int uvc_ctrl_add_mapping(struct uvc_control_mapping *mapping);
631 extern int uvc_ctrl_init_device(struct uvc_device *dev);
632 extern void uvc_ctrl_cleanup_device(struct uvc_device *dev);
633 extern int uvc_ctrl_resume_device(struct uvc_device *dev);
634 extern void uvc_ctrl_init(void);
635
636 extern int uvc_ctrl_begin(struct uvc_video_chain *chain);
637 extern int __uvc_ctrl_commit(struct uvc_video_chain *chain, int rollback);
638 static inline int uvc_ctrl_commit(struct uvc_video_chain *chain)
639 {
640         return __uvc_ctrl_commit(chain, 0);
641 }
642 static inline int uvc_ctrl_rollback(struct uvc_video_chain *chain)
643 {
644         return __uvc_ctrl_commit(chain, 1);
645 }
646
647 extern int uvc_ctrl_get(struct uvc_video_chain *chain,
648                 struct v4l2_ext_control *xctrl);
649 extern int uvc_ctrl_set(struct uvc_video_chain *chain,
650                 struct v4l2_ext_control *xctrl);
651
652 extern int uvc_xu_ctrl_query(struct uvc_video_chain *chain,
653                 struct uvc_xu_control *ctrl, int set);
654
655 /* Utility functions */
656 extern void uvc_simplify_fraction(uint32_t *numerator, uint32_t *denominator,
657                 unsigned int n_terms, unsigned int threshold);
658 extern uint32_t uvc_fraction_to_interval(uint32_t numerator,
659                 uint32_t denominator);
660 extern struct usb_host_endpoint *uvc_find_endpoint(
661                 struct usb_host_interface *alts, __u8 epaddr);
662
663 /* Quirks support */
664 void uvc_video_decode_isight(struct urb *urb, struct uvc_streaming *stream,
665                 struct uvc_buffer *buf);
666
667 #endif /* __KERNEL__ */
668
669 #endif
670