Implement poll for events. POLLPRI is used to notify the user an event is
complete.
Signed-off-by: Sakari Ailus <sakari.ai...@linux.intel.com>
---
drivers/media/media-device.c | 29 +++++++++++++++++++++++++++++
1 file changed, 29 insertions(+)
diff --git a/drivers/media/media-device.c b/drivers/media/media-device.c
index 41ec5ac..a4d3884 100644
--- a/drivers/media/media-device.c
+++ b/drivers/media/media-device.c
@@ -84,6 +84,34 @@ void media_device_request_put(struct media_device_request
*req)
}
EXPORT_SYMBOL_GPL(media_device_request_put);
+static unsigned int media_device_request_poll(struct file *filp,
+ struct poll_table_struct *wait)
+{
+ struct media_device_request *req = filp->private_data;
+ struct media_device *mdev = req->mdev;
+ unsigned int poll_events = poll_requested_events(wait);
+ int ret = 0;
+
+ if (poll_events & (POLLIN | POLLOUT))
+ return POLLERR;
+
+ if (poll_events & POLLPRI) {
+ unsigned long flags;
+ bool complete;
+
+ spin_lock_irqsave(&mdev->req_lock, flags);
+ complete = req->state == MEDIA_DEVICE_REQUEST_STATE_COMPLETE;
+ spin_unlock_irqrestore(&mdev->req_lock, flags);
+
+ if (complete)
+ poll_wait(filp, &req->poll_wait, wait);
+ else
+ ret |= POLLPRI;
+ }
+
+ return ret;
+}
+
static int media_device_request_close(struct inode *inode, struct file *filp)
{
struct media_device_request *req = filp->private_data;
@@ -95,6 +123,7 @@ static int media_device_request_close(struct inode *inode,
struct file *filp)
static const struct file_operations request_fops = {
.owner = THIS_MODULE,
+ .poll = media_device_request_poll,
.release = media_device_request_close,
};
--
2.7.4
