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[media] v4l2-ctrls: add helper functions for control events

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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>
This commit is contained in:
Hans Verkuil 2012-01-27 16:18:42 -03:00 committed by Mauro Carvalho Chehab
parent 42194e728f
commit a26243b0e3
2 changed files with 29 additions and 0 deletions
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20
drivers/media/video/v4l2-ctrls.c
View File

@ -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);

9
include/media/v4l2-ctrls.h
View File

@ -33,6 +33,7 @@ struct video_device;
struct v4l2_subdev;
struct v4l2_subscribed_event;
struct v4l2_fh;
struct poll_table_struct;
/** struct v4l2_ctrl_ops - The control operations that the driver has to provide.
* @g_volatile_ctrl: Get a new value for this control. Generally only relevant
@ -496,6 +497,14 @@ void v4l2_ctrl_del_event(struct v4l2_ctrl *ctrl,
associated with the filehandle. */
int v4l2_ctrl_log_status(struct file *file, void *fh);
/* Can be used as a vidioc_subscribe_event function that just subscribes
control events. */
int v4l2_ctrl_subscribe_event(struct v4l2_fh *fh,
struct v4l2_event_subscription *sub);
/* Can be used as a poll function that just polls for control events. */
unsigned int v4l2_ctrl_poll(struct file *file, struct poll_table_struct *wait);
/* Helpers for ioctl_ops. If hdl == NULL then they will all return -EINVAL. */
int v4l2_queryctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_queryctrl *qc);
int v4l2_querymenu(struct v4l2_ctrl_handler *hdl, struct v4l2_querymenu *qm);