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authorJunghak Sung <jh1009.sung@samsung.com>2015-11-03 08:16:39 -0200
committerMauro Carvalho Chehab <mchehab@osg.samsung.com>2015-12-18 13:55:03 -0200
commit49d8ab9feaf20e7247edfdb36ce9ffa8db6b5f19 (patch)
treeb20cab3c30c8974cac9815e75f87cc71e24ca5d9 /drivers/media/v4l2-core/videobuf2-v4l2.c
parent959c3ef336fc363e522611812dd1d00443706dec (diff)
[media] media: videobuf2: Separate vb2_poll()
Separate vb2_poll() into core and v4l2 part. Signed-off-by: Junghak Sung <jh1009.sung@samsung.com> Signed-off-by: Geunyoung Kim <nenggun.kim@samsung.com> Acked-by: Seung-Woo Kim <sw0312.kim@samsung.com> Acked-by: Inki Dae <inki.dae@samsung.com> Signed-off-by: Hans Verkuil <hansverk@cisco.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
Diffstat (limited to 'drivers/media/v4l2-core/videobuf2-v4l2.c')
-rw-r--r--drivers/media/v4l2-core/videobuf2-v4l2.c93
1 files changed, 59 insertions, 34 deletions
diff --git a/drivers/media/v4l2-core/videobuf2-v4l2.c b/drivers/media/v4l2-core/videobuf2-v4l2.c
index e03f70068447..a6945eeef545 100644
--- a/drivers/media/v4l2-core/videobuf2-v4l2.c
+++ b/drivers/media/v4l2-core/videobuf2-v4l2.c
@@ -783,7 +783,7 @@ void vb2_queue_release(struct vb2_queue *q)
EXPORT_SYMBOL_GPL(vb2_queue_release);
/**
- * vb2_poll() - implements poll userspace operation
+ * vb2_core_poll() - implements poll userspace operation
* @q: videobuf2 queue
* @file: file argument passed to the poll file operation handler
* @wait: wait argument passed to the poll file operation handler
@@ -795,33 +795,20 @@ EXPORT_SYMBOL_GPL(vb2_queue_release);
* For OUTPUT queues, if a buffer is ready to be dequeued, the file descriptor
* will be reported as available for writing.
*
- * If the driver uses struct v4l2_fh, then vb2_poll() will also check for any
- * pending events.
- *
* The return values from this function are intended to be directly returned
* from poll handler in driver.
*/
-unsigned int vb2_poll(struct vb2_queue *q, struct file *file, poll_table *wait)
+unsigned int vb2_core_poll(struct vb2_queue *q, struct file *file,
+ poll_table *wait)
{
- struct video_device *vfd = video_devdata(file);
unsigned long req_events = poll_requested_events(wait);
struct vb2_buffer *vb = NULL;
- unsigned int res = 0;
unsigned long flags;
- if (test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags)) {
- struct v4l2_fh *fh = file->private_data;
-
- if (v4l2_event_pending(fh))
- res = POLLPRI;
- else if (req_events & POLLPRI)
- poll_wait(file, &fh->wait, wait);
- }
-
if (!q->is_output && !(req_events & (POLLIN | POLLRDNORM)))
- return res;
+ return 0;
if (q->is_output && !(req_events & (POLLOUT | POLLWRNORM)))
- return res;
+ return 0;
/*
* Start file I/O emulator only if streaming API has not been used yet.
@@ -830,16 +817,16 @@ unsigned int vb2_poll(struct vb2_queue *q, struct file *file, poll_table *wait)
if (!q->is_output && (q->io_modes & VB2_READ) &&
(req_events & (POLLIN | POLLRDNORM))) {
if (__vb2_init_fileio(q, 1))
- return res | POLLERR;
+ return POLLERR;
}
if (q->is_output && (q->io_modes & VB2_WRITE) &&
(req_events & (POLLOUT | POLLWRNORM))) {
if (__vb2_init_fileio(q, 0))
- return res | POLLERR;
+ return POLLERR;
/*
* Write to OUTPUT queue can be done immediately.
*/
- return res | POLLOUT | POLLWRNORM;
+ return POLLOUT | POLLWRNORM;
}
}
@@ -848,21 +835,14 @@ unsigned int vb2_poll(struct vb2_queue *q, struct file *file, poll_table *wait)
* error flag is set.
*/
if (!vb2_is_streaming(q) || q->error)
- return res | POLLERR;
- /*
- * For compatibility with vb1: if QBUF hasn't been called yet, then
- * return POLLERR as well. This only affects capture queues, output
- * queues will always initialize waiting_for_buffers to false.
- */
- if (q->waiting_for_buffers)
- return res | POLLERR;
+ return POLLERR;
/*
* For output streams you can call write() as long as there are fewer
* buffers queued than there are buffers available.
*/
if (q->is_output && q->fileio && q->queued_count < q->num_buffers)
- return res | POLLOUT | POLLWRNORM;
+ return POLLOUT | POLLWRNORM;
if (list_empty(&q->done_list)) {
/*
@@ -870,7 +850,7 @@ unsigned int vb2_poll(struct vb2_queue *q, struct file *file, poll_table *wait)
* return immediately. DQBUF will return -EPIPE.
*/
if (q->last_buffer_dequeued)
- return res | POLLIN | POLLRDNORM;
+ return POLLIN | POLLRDNORM;
poll_wait(file, &q->done_wq, wait);
}
@@ -887,10 +867,55 @@ unsigned int vb2_poll(struct vb2_queue *q, struct file *file, poll_table *wait)
if (vb && (vb->state == VB2_BUF_STATE_DONE
|| vb->state == VB2_BUF_STATE_ERROR)) {
return (q->is_output) ?
- res | POLLOUT | POLLWRNORM :
- res | POLLIN | POLLRDNORM;
+ POLLOUT | POLLWRNORM :
+ POLLIN | POLLRDNORM;
}
- return res;
+ return 0;
+}
+
+/**
+ * vb2_poll() - implements poll userspace operation
+ * @q: videobuf2 queue
+ * @file: file argument passed to the poll file operation handler
+ * @wait: wait argument passed to the poll file operation handler
+ *
+ * This function implements poll file operation handler for a driver.
+ * For CAPTURE queues, if a buffer is ready to be dequeued, the userspace will
+ * be informed that the file descriptor of a video device is available for
+ * reading.
+ * For OUTPUT queues, if a buffer is ready to be dequeued, the file descriptor
+ * will be reported as available for writing.
+ *
+ * If the driver uses struct v4l2_fh, then vb2_poll() will also check for any
+ * pending events.
+ *
+ * The return values from this function are intended to be directly returned
+ * from poll handler in driver.
+ */
+unsigned int vb2_poll(struct vb2_queue *q, struct file *file, poll_table *wait)
+{
+ struct video_device *vfd = video_devdata(file);
+ unsigned long req_events = poll_requested_events(wait);
+ unsigned int res = 0;
+
+ if (test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags)) {
+ struct v4l2_fh *fh = file->private_data;
+
+ if (v4l2_event_pending(fh))
+ res = POLLPRI;
+ else if (req_events & POLLPRI)
+ poll_wait(file, &fh->wait, wait);
+ }
+
+ /*
+ * For compatibility with vb1: if QBUF hasn't been called yet, then
+ * return POLLERR as well. This only affects capture queues, output
+ * queues will always initialize waiting_for_buffers to false.
+ */
+ if (q->waiting_for_buffers && (req_events & (POLLIN | POLLRDNORM)))
+ return POLLERR;
+
+ return res | vb2_core_poll(q, file, wait);
}
EXPORT_SYMBOL_GPL(vb2_poll);

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