Implement poll for events. POLLPRI is used to notify users on incoming
events.
Signed-off-by: Sakari Ailus <sakari.ailus@xxxxxxxxxxxxxxx>
---
drivers/media/media-device.c | 28 ++++++++++++++++++++++++++++
1 file changed, 28 insertions(+)
diff --git a/drivers/media/media-device.c b/drivers/media/media-device.c
index 2ff8b29..25f7aea 100644
--- a/drivers/media/media-device.c
+++ b/drivers/media/media-device.c
@@ -1041,6 +1041,33 @@ static long media_device_ioctl(struct file *filp, unsigned int cmd,
ioctl_info, ARRAY_SIZE(ioctl_info));
}
+unsigned int media_device_poll(struct file *filp, struct poll_table_struct *wait)
+{
+ struct media_device_fh *fh = media_device_fh(filp);
+ struct media_device *mdev = to_media_device(fh->fh.devnode);
+ 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 empty;
+
+ spin_lock_irqsave(&mdev->req_lock, flags);
+ empty = list_empty(&fh->kevents.head);
+ spin_unlock_irqrestore(&mdev->req_lock, flags);
+
+ if (empty)
+ poll_wait(filp, &fh->kevents.wait, wait);
+ else
+ ret |= POLLPRI;
+ }
+
+ return ret;
+}
+
#ifdef CONFIG_COMPAT
struct media_links_enum32 {
@@ -1095,6 +1122,7 @@ static const struct media_file_operations media_device_fops = {
.owner = THIS_MODULE,
.open = media_device_open,
.ioctl = media_device_ioctl,
+ .poll = media_device_poll,
#ifdef CONFIG_COMPAT
.compat_ioctl = media_device_compat_ioctl,
#endif /* CONFIG_COMPAT */
--
1.9.1
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