diff options
author | Laurent Pinchart <laurent.pinchart@ideasonboard.com> | 2010-11-21 18:18:08 (GMT) |
---|---|---|
committer | Mauro Carvalho Chehab <mchehab@redhat.com> | 2010-12-01 22:10:23 (GMT) |
commit | 4aa275975beee41fd542a0f6df8cd0fee06089bf (patch) | |
tree | 67896fb85b3a89838d0d91fee89622e3ec210135 /drivers/media/video/uvc | |
parent | 8e815e1763b8d4e5adf0dc14bde8c55329cf95a8 (diff) | |
download | linux-fsl-qoriq-4aa275975beee41fd542a0f6df8cd0fee06089bf.tar.xz |
[media] uvcvideo: Move mmap() handler to uvc_queue.c
The mmap() implementation belongs to the video buffers queue, move it
there.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'drivers/media/video/uvc')
-rw-r--r-- | drivers/media/video/uvc/uvc_queue.c | 76 | ||||
-rw-r--r-- | drivers/media/video/uvc/uvc_v4l2.c | 67 | ||||
-rw-r--r-- | drivers/media/video/uvc/uvcvideo.h | 2 |
3 files changed, 79 insertions, 66 deletions
diff --git a/drivers/media/video/uvc/uvc_queue.c b/drivers/media/video/uvc/uvc_queue.c index 32c1822..f14581b 100644 --- a/drivers/media/video/uvc/uvc_queue.c +++ b/drivers/media/video/uvc/uvc_queue.c @@ -380,6 +380,82 @@ done: } /* + * VMA operations. + */ +static void uvc_vm_open(struct vm_area_struct *vma) +{ + struct uvc_buffer *buffer = vma->vm_private_data; + buffer->vma_use_count++; +} + +static void uvc_vm_close(struct vm_area_struct *vma) +{ + struct uvc_buffer *buffer = vma->vm_private_data; + buffer->vma_use_count--; +} + +static const struct vm_operations_struct uvc_vm_ops = { + .open = uvc_vm_open, + .close = uvc_vm_close, +}; + +/* + * Memory-map a video buffer. + * + * This function implements video buffers memory mapping and is intended to be + * used by the device mmap handler. + */ +int uvc_queue_mmap(struct uvc_video_queue *queue, struct vm_area_struct *vma) +{ + struct uvc_buffer *uninitialized_var(buffer); + struct page *page; + unsigned long addr, start, size; + unsigned int i; + int ret = 0; + + start = vma->vm_start; + size = vma->vm_end - vma->vm_start; + + mutex_lock(&queue->mutex); + + for (i = 0; i < queue->count; ++i) { + buffer = &queue->buffer[i]; + if ((buffer->buf.m.offset >> PAGE_SHIFT) == vma->vm_pgoff) + break; + } + + if (i == queue->count || size != queue->buf_size) { + ret = -EINVAL; + goto done; + } + + /* + * VM_IO marks the area as being an mmaped region for I/O to a + * device. It also prevents the region from being core dumped. + */ + vma->vm_flags |= VM_IO; + + addr = (unsigned long)queue->mem + buffer->buf.m.offset; + while (size > 0) { + page = vmalloc_to_page((void *)addr); + if ((ret = vm_insert_page(vma, start, page)) < 0) + goto done; + + start += PAGE_SIZE; + addr += PAGE_SIZE; + size -= PAGE_SIZE; + } + + vma->vm_ops = &uvc_vm_ops; + vma->vm_private_data = buffer; + uvc_vm_open(vma); + +done: + mutex_unlock(&queue->mutex); + return ret; +} + +/* * Poll the video queue. * * This function implements video queue polling and is intended to be used by diff --git a/drivers/media/video/uvc/uvc_v4l2.c b/drivers/media/video/uvc/uvc_v4l2.c index 0fd9848b..07dd235 100644 --- a/drivers/media/video/uvc/uvc_v4l2.c +++ b/drivers/media/video/uvc/uvc_v4l2.c @@ -1032,79 +1032,14 @@ static ssize_t uvc_v4l2_read(struct file *file, char __user *data, return -EINVAL; } -/* - * VMA operations. - */ -static void uvc_vm_open(struct vm_area_struct *vma) -{ - struct uvc_buffer *buffer = vma->vm_private_data; - buffer->vma_use_count++; -} - -static void uvc_vm_close(struct vm_area_struct *vma) -{ - struct uvc_buffer *buffer = vma->vm_private_data; - buffer->vma_use_count--; -} - -static const struct vm_operations_struct uvc_vm_ops = { - .open = uvc_vm_open, - .close = uvc_vm_close, -}; - static int uvc_v4l2_mmap(struct file *file, struct vm_area_struct *vma) { struct uvc_fh *handle = file->private_data; struct uvc_streaming *stream = handle->stream; - struct uvc_video_queue *queue = &stream->queue; - struct uvc_buffer *uninitialized_var(buffer); - struct page *page; - unsigned long addr, start, size; - unsigned int i; - int ret = 0; uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_mmap\n"); - start = vma->vm_start; - size = vma->vm_end - vma->vm_start; - - mutex_lock(&queue->mutex); - - for (i = 0; i < queue->count; ++i) { - buffer = &queue->buffer[i]; - if ((buffer->buf.m.offset >> PAGE_SHIFT) == vma->vm_pgoff) - break; - } - - if (i == queue->count || size != queue->buf_size) { - ret = -EINVAL; - goto done; - } - - /* - * VM_IO marks the area as being an mmaped region for I/O to a - * device. It also prevents the region from being core dumped. - */ - vma->vm_flags |= VM_IO; - - addr = (unsigned long)queue->mem + buffer->buf.m.offset; - while (size > 0) { - page = vmalloc_to_page((void *)addr); - if ((ret = vm_insert_page(vma, start, page)) < 0) - goto done; - - start += PAGE_SIZE; - addr += PAGE_SIZE; - size -= PAGE_SIZE; - } - - vma->vm_ops = &uvc_vm_ops; - vma->vm_private_data = buffer; - uvc_vm_open(vma); - -done: - mutex_unlock(&queue->mutex); - return ret; + return uvc_queue_mmap(&stream->queue, vma); } static unsigned int uvc_v4l2_poll(struct file *file, poll_table *wait) diff --git a/drivers/media/video/uvc/uvcvideo.h b/drivers/media/video/uvc/uvcvideo.h index 4520924..ea893bc 100644 --- a/drivers/media/video/uvc/uvcvideo.h +++ b/drivers/media/video/uvc/uvcvideo.h @@ -574,6 +574,8 @@ 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 int uvc_queue_mmap(struct uvc_video_queue *queue, + struct vm_area_struct *vma); extern unsigned int uvc_queue_poll(struct uvc_video_queue *queue, struct file *file, poll_table *wait); extern int uvc_queue_allocated(struct uvc_video_queue *queue); |