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path: root/drivers/media/usb/uvc/uvc_queue.c
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Diffstat (limited to 'drivers/media/usb/uvc/uvc_queue.c')
-rw-r--r--drivers/media/usb/uvc/uvc_queue.c161
1 files changed, 97 insertions, 64 deletions
diff --git a/drivers/media/usb/uvc/uvc_queue.c b/drivers/media/usb/uvc/uvc_queue.c
index 6e92d2080255..cc960723b926 100644
--- a/drivers/media/usb/uvc/uvc_queue.c
+++ b/drivers/media/usb/uvc/uvc_queue.c
@@ -36,6 +36,34 @@
* the driver.
*/
+static inline struct uvc_streaming *
+uvc_queue_to_stream(struct uvc_video_queue *queue)
+{
+ return container_of(queue, struct uvc_streaming, queue);
+}
+
+/*
+ * Return all queued buffers to videobuf2 in the requested state.
+ *
+ * This function must be called with the queue spinlock held.
+ */
+static void uvc_queue_return_buffers(struct uvc_video_queue *queue,
+ enum uvc_buffer_state state)
+{
+ enum vb2_buffer_state vb2_state = state == UVC_BUF_STATE_ERROR
+ ? VB2_BUF_STATE_ERROR
+ : VB2_BUF_STATE_QUEUED;
+
+ while (!list_empty(&queue->irqqueue)) {
+ struct uvc_buffer *buf = list_first_entry(&queue->irqqueue,
+ struct uvc_buffer,
+ queue);
+ list_del(&buf->queue);
+ buf->state = state;
+ vb2_buffer_done(&buf->buf, vb2_state);
+ }
+}
+
/* -----------------------------------------------------------------------------
* videobuf2 queue operations
*/
@@ -45,8 +73,7 @@ static int uvc_queue_setup(struct vb2_queue *vq, const struct v4l2_format *fmt,
unsigned int sizes[], void *alloc_ctxs[])
{
struct uvc_video_queue *queue = vb2_get_drv_priv(vq);
- struct uvc_streaming *stream =
- container_of(queue, struct uvc_streaming, queue);
+ struct uvc_streaming *stream = uvc_queue_to_stream(queue);
/* Make sure the image size is large enough. */
if (fmt && fmt->fmt.pix.sizeimage < stream->ctrl.dwMaxVideoFrameSize)
@@ -109,8 +136,7 @@ static void uvc_buffer_queue(struct vb2_buffer *vb)
static void uvc_buffer_finish(struct vb2_buffer *vb)
{
struct uvc_video_queue *queue = vb2_get_drv_priv(vb->vb2_queue);
- struct uvc_streaming *stream =
- container_of(queue, struct uvc_streaming, queue);
+ struct uvc_streaming *stream = uvc_queue_to_stream(queue);
struct uvc_buffer *buf = container_of(vb, struct uvc_buffer, buf);
if (vb->state == VB2_BUF_STATE_DONE)
@@ -131,6 +157,39 @@ static void uvc_wait_finish(struct vb2_queue *vq)
mutex_lock(&queue->mutex);
}
+static int uvc_start_streaming(struct vb2_queue *vq, unsigned int count)
+{
+ struct uvc_video_queue *queue = vb2_get_drv_priv(vq);
+ struct uvc_streaming *stream = uvc_queue_to_stream(queue);
+ unsigned long flags;
+ int ret;
+
+ queue->buf_used = 0;
+
+ ret = uvc_video_enable(stream, 1);
+ if (ret == 0)
+ return 0;
+
+ spin_lock_irqsave(&queue->irqlock, flags);
+ uvc_queue_return_buffers(queue, UVC_BUF_STATE_QUEUED);
+ spin_unlock_irqrestore(&queue->irqlock, flags);
+
+ return ret;
+}
+
+static void uvc_stop_streaming(struct vb2_queue *vq)
+{
+ struct uvc_video_queue *queue = vb2_get_drv_priv(vq);
+ struct uvc_streaming *stream = uvc_queue_to_stream(queue);
+ unsigned long flags;
+
+ uvc_video_enable(stream, 0);
+
+ spin_lock_irqsave(&queue->irqlock, flags);
+ uvc_queue_return_buffers(queue, UVC_BUF_STATE_ERROR);
+ spin_unlock_irqrestore(&queue->irqlock, flags);
+}
+
static struct vb2_ops uvc_queue_qops = {
.queue_setup = uvc_queue_setup,
.buf_prepare = uvc_buffer_prepare,
@@ -138,6 +197,8 @@ static struct vb2_ops uvc_queue_qops = {
.buf_finish = uvc_buffer_finish,
.wait_prepare = uvc_wait_prepare,
.wait_finish = uvc_wait_finish,
+ .start_streaming = uvc_start_streaming,
+ .stop_streaming = uvc_stop_streaming,
};
int uvc_queue_init(struct uvc_video_queue *queue, enum v4l2_buf_type type,
@@ -165,12 +226,19 @@ int uvc_queue_init(struct uvc_video_queue *queue, enum v4l2_buf_type type,
return 0;
}
+void uvc_queue_release(struct uvc_video_queue *queue)
+{
+ mutex_lock(&queue->mutex);
+ vb2_queue_release(&queue->queue);
+ mutex_unlock(&queue->mutex);
+}
+
/* -----------------------------------------------------------------------------
* V4L2 queue operations
*/
-int uvc_alloc_buffers(struct uvc_video_queue *queue,
- struct v4l2_requestbuffers *rb)
+int uvc_request_buffers(struct uvc_video_queue *queue,
+ struct v4l2_requestbuffers *rb)
{
int ret;
@@ -181,13 +249,6 @@ int uvc_alloc_buffers(struct uvc_video_queue *queue,
return ret ? ret : rb->count;
}
-void uvc_free_buffers(struct uvc_video_queue *queue)
-{
- mutex_lock(&queue->mutex);
- vb2_queue_release(&queue->queue);
- mutex_unlock(&queue->mutex);
-}
-
int uvc_query_buffer(struct uvc_video_queue *queue, struct v4l2_buffer *buf)
{
int ret;
@@ -234,6 +295,28 @@ int uvc_dequeue_buffer(struct uvc_video_queue *queue, struct v4l2_buffer *buf,
return ret;
}
+int uvc_queue_streamon(struct uvc_video_queue *queue, enum v4l2_buf_type type)
+{
+ int ret;
+
+ mutex_lock(&queue->mutex);
+ ret = vb2_streamon(&queue->queue, type);
+ mutex_unlock(&queue->mutex);
+
+ return ret;
+}
+
+int uvc_queue_streamoff(struct uvc_video_queue *queue, enum v4l2_buf_type type)
+{
+ int ret;
+
+ mutex_lock(&queue->mutex);
+ ret = vb2_streamoff(&queue->queue, type);
+ mutex_unlock(&queue->mutex);
+
+ return ret;
+}
+
int uvc_queue_mmap(struct uvc_video_queue *queue, struct vm_area_struct *vma)
{
int ret;
@@ -289,49 +372,6 @@ int uvc_queue_allocated(struct uvc_video_queue *queue)
}
/*
- * Enable or disable the video buffers queue.
- *
- * The queue must be enabled before starting video acquisition and must be
- * disabled after stopping it. This ensures that the video buffers queue
- * state can be properly initialized before buffers are accessed from the
- * interrupt handler.
- *
- * Enabling the video queue returns -EBUSY if the queue is already enabled.
- *
- * Disabling the video queue cancels the queue and removes all buffers from
- * the main queue.
- *
- * This function can't be called from interrupt context. Use
- * uvc_queue_cancel() instead.
- */
-int uvc_queue_enable(struct uvc_video_queue *queue, int enable)
-{
- unsigned long flags;
- int ret;
-
- mutex_lock(&queue->mutex);
- if (enable) {
- ret = vb2_streamon(&queue->queue, queue->queue.type);
- if (ret < 0)
- goto done;
-
- queue->buf_used = 0;
- } else {
- ret = vb2_streamoff(&queue->queue, queue->queue.type);
- if (ret < 0)
- goto done;
-
- spin_lock_irqsave(&queue->irqlock, flags);
- INIT_LIST_HEAD(&queue->irqqueue);
- spin_unlock_irqrestore(&queue->irqlock, flags);
- }
-
-done:
- mutex_unlock(&queue->mutex);
- return ret;
-}
-
-/*
* Cancel the video buffers queue.
*
* Cancelling the queue marks all buffers on the irq queue as erroneous,
@@ -345,17 +385,10 @@ done:
*/
void uvc_queue_cancel(struct uvc_video_queue *queue, int disconnect)
{
- struct uvc_buffer *buf;
unsigned long flags;
spin_lock_irqsave(&queue->irqlock, flags);
- while (!list_empty(&queue->irqqueue)) {
- buf = list_first_entry(&queue->irqqueue, struct uvc_buffer,
- queue);
- list_del(&buf->queue);
- buf->state = UVC_BUF_STATE_ERROR;
- vb2_buffer_done(&buf->buf, VB2_BUF_STATE_ERROR);
- }
+ uvc_queue_return_buffers(queue, UVC_BUF_STATE_ERROR);
/* This must be protected by the irqlock spinlock to avoid race
* conditions between uvc_buffer_queue and the disconnection event that
* could result in an interruptible wait in uvc_dequeue_buffer. Do not