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authorHans Verkuil2012-01-27 16:18:42 -0300
committerMauro Carvalho Chehab2012-02-14 16:38:43 -0200
commita26243b0e3726d2b39dc23dd2c8717c52a286af4 (patch)
tree478ea3c96e683a29a937746c853f5dcf4d323f03 /drivers/media/video/v4l2-ctrls.c
parent42194e728f067cde09a95ce522c108756d44c0be (diff)
[media] v4l2-ctrls: add helper functions for control events
Many drivers just support control events, and most radio drivers just need to poll for control events. Add some functions to simplify those jobs. Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'drivers/media/video/v4l2-ctrls.c')
-rw-r--r--drivers/media/video/v4l2-ctrls.c20
1 files changed, 20 insertions, 0 deletions
diff --git a/drivers/media/video/v4l2-ctrls.c b/drivers/media/video/v4l2-ctrls.c
index 7d58e4d420cd..909117203610 100644
--- a/drivers/media/video/v4l2-ctrls.c
+++ b/drivers/media/video/v4l2-ctrls.c
@@ -2394,3 +2394,23 @@ int v4l2_ctrl_log_status(struct file *file, void *fh)
return 0;
}
EXPORT_SYMBOL(v4l2_ctrl_log_status);
+
+int v4l2_ctrl_subscribe_event(struct v4l2_fh *fh,
+ struct v4l2_event_subscription *sub)
+{
+ if (sub->type == V4L2_EVENT_CTRL)
+ return v4l2_event_subscribe(fh, sub, 0);
+ return -EINVAL;
+}
+EXPORT_SYMBOL(v4l2_ctrl_subscribe_event);
+
+unsigned int v4l2_ctrl_poll(struct file *file, struct poll_table_struct *wait)
+{
+ struct v4l2_fh *fh = file->private_data;
+
+ if (v4l2_event_pending(fh))
+ return POLLPRI;
+ poll_wait(file, &fh->wait, wait);
+ return 0;
+}
+EXPORT_SYMBOL(v4l2_ctrl_poll);