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author | Jens Axboe <jens.axboe@oracle.com> | 2010-05-21 21:27:26 +0200 |
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committer | Jens Axboe <jens.axboe@oracle.com> | 2010-05-21 21:27:26 +0200 |
commit | ee9a3607fb03e804ddf624544105f4e34260c380 (patch) | |
tree | ce41b6e0fa10982a306f6c142a92dbf3c9961284 /drivers/usb/gadget/uvc_queue.h | |
parent | pipe: set lower and upper limit on max pages in the pipe page array (diff) | |
parent | Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jac... (diff) | |
download | linux-ee9a3607fb03e804ddf624544105f4e34260c380.tar.xz linux-ee9a3607fb03e804ddf624544105f4e34260c380.zip |
Merge branch 'master' into for-2.6.35
Conflicts:
fs/ext3/fsync.c
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'drivers/usb/gadget/uvc_queue.h')
-rw-r--r-- | drivers/usb/gadget/uvc_queue.h | 89 |
1 files changed, 89 insertions, 0 deletions
diff --git a/drivers/usb/gadget/uvc_queue.h b/drivers/usb/gadget/uvc_queue.h new file mode 100644 index 000000000000..7f5a33fe7ae2 --- /dev/null +++ b/drivers/usb/gadget/uvc_queue.h @@ -0,0 +1,89 @@ +#ifndef _UVC_QUEUE_H_ +#define _UVC_QUEUE_H_ + +#ifdef __KERNEL__ + +#include <linux/kernel.h> +#include <linux/poll.h> +#include <linux/videodev2.h> + +/* Maximum frame size in bytes, for sanity checking. */ +#define UVC_MAX_FRAME_SIZE (16*1024*1024) +/* Maximum number of video buffers. */ +#define UVC_MAX_VIDEO_BUFFERS 32 + +/* ------------------------------------------------------------------------ + * Structures. + */ + +enum uvc_buffer_state { + UVC_BUF_STATE_IDLE = 0, + UVC_BUF_STATE_QUEUED = 1, + UVC_BUF_STATE_ACTIVE = 2, + UVC_BUF_STATE_DONE = 3, + UVC_BUF_STATE_ERROR = 4, +}; + +struct uvc_buffer { + unsigned long vma_use_count; + struct list_head stream; + + /* Touched by interrupt handler. */ + struct v4l2_buffer buf; + struct list_head queue; + wait_queue_head_t wait; + enum uvc_buffer_state state; +}; + +#define UVC_QUEUE_STREAMING (1 << 0) +#define UVC_QUEUE_DISCONNECTED (1 << 1) +#define UVC_QUEUE_DROP_INCOMPLETE (1 << 2) +#define UVC_QUEUE_PAUSED (1 << 3) + +struct uvc_video_queue { + enum v4l2_buf_type type; + + void *mem; + unsigned int flags; + __u32 sequence; + + unsigned int count; + unsigned int buf_size; + unsigned int buf_used; + struct uvc_buffer buffer[UVC_MAX_VIDEO_BUFFERS]; + struct mutex mutex; /* protects buffers and mainqueue */ + spinlock_t irqlock; /* protects irqqueue */ + + struct list_head mainqueue; + struct list_head irqqueue; +}; + +extern void uvc_queue_init(struct uvc_video_queue *queue, + enum v4l2_buf_type type); +extern int uvc_alloc_buffers(struct uvc_video_queue *queue, + unsigned int nbuffers, unsigned int buflength); +extern int uvc_free_buffers(struct uvc_video_queue *queue); +extern int uvc_query_buffer(struct uvc_video_queue *queue, + struct v4l2_buffer *v4l2_buf); +extern int uvc_queue_buffer(struct uvc_video_queue *queue, + struct v4l2_buffer *v4l2_buf); +extern int uvc_dequeue_buffer(struct uvc_video_queue *queue, + struct v4l2_buffer *v4l2_buf, int nonblocking); +extern int uvc_queue_enable(struct uvc_video_queue *queue, int enable); +extern void uvc_queue_cancel(struct uvc_video_queue *queue, int disconnect); +extern struct uvc_buffer *uvc_queue_next_buffer(struct uvc_video_queue *queue, + struct uvc_buffer *buf); +extern unsigned int uvc_queue_poll(struct uvc_video_queue *queue, + struct file *file, poll_table *wait); +extern int uvc_queue_mmap(struct uvc_video_queue *queue, + struct vm_area_struct *vma); +static inline int uvc_queue_streaming(struct uvc_video_queue *queue) +{ + return queue->flags & UVC_QUEUE_STREAMING; +} +extern struct uvc_buffer *uvc_queue_head(struct uvc_video_queue *queue); + +#endif /* __KERNEL__ */ + +#endif /* _UVC_QUEUE_H_ */ + |