[media] v4l: subdev: Events support
Provide v4l2_subdevs with v4l2_event support. Subdev drivers only need very
little to support events.
Signed-off-by: Sakari Ailus <sakari.ailus@iki.fi>
Signed-off-by: David Cohen <dacohen@gmail.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
diff --git a/drivers/media/video/v4l2-subdev.c b/drivers/media/video/v4l2-subdev.c
index da10430..0c67f5a 100644
--- a/drivers/media/video/v4l2-subdev.c
+++ b/drivers/media/video/v4l2-subdev.c
@@ -20,21 +20,66 @@
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
-#include <linux/types.h>
#include <linux/ioctl.h>
+#include <linux/slab.h>
+#include <linux/types.h>
#include <linux/videodev2.h>
#include <media/v4l2-ctrls.h>
#include <media/v4l2-device.h>
#include <media/v4l2-ioctl.h>
+#include <media/v4l2-fh.h>
+#include <media/v4l2-event.h>
static int subdev_open(struct file *file)
{
+ struct video_device *vdev = video_devdata(file);
+ struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
+ struct v4l2_fh *vfh;
+ int ret;
+
+ if (sd->flags & V4L2_SUBDEV_FL_HAS_EVENTS) {
+ vfh = kzalloc(sizeof(*vfh), GFP_KERNEL);
+ if (vfh == NULL)
+ return -ENOMEM;
+
+ ret = v4l2_fh_init(vfh, vdev);
+ if (ret)
+ goto err;
+
+ ret = v4l2_event_init(vfh);
+ if (ret)
+ goto err;
+
+ ret = v4l2_event_alloc(vfh, sd->nevents);
+ if (ret)
+ goto err;
+
+ v4l2_fh_add(vfh);
+ file->private_data = vfh;
+ }
+
return 0;
+
+err:
+ if (vfh != NULL) {
+ v4l2_fh_exit(vfh);
+ kfree(vfh);
+ }
+
+ return ret;
}
static int subdev_close(struct file *file)
{
+ struct v4l2_fh *vfh = file->private_data;
+
+ if (vfh != NULL) {
+ v4l2_fh_del(vfh);
+ v4l2_fh_exit(vfh);
+ kfree(vfh);
+ }
+
return 0;
}
@@ -42,6 +87,7 @@
{
struct video_device *vdev = video_devdata(file);
struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
+ struct v4l2_fh *fh = file->private_data;
switch (cmd) {
case VIDIOC_QUERYCTRL:
@@ -65,6 +111,18 @@
case VIDIOC_TRY_EXT_CTRLS:
return v4l2_subdev_try_ext_ctrls(sd, arg);
+ case VIDIOC_DQEVENT:
+ if (!(sd->flags & V4L2_SUBDEV_FL_HAS_EVENTS))
+ return -ENOIOCTLCMD;
+
+ return v4l2_event_dequeue(fh, arg, file->f_flags & O_NONBLOCK);
+
+ case VIDIOC_SUBSCRIBE_EVENT:
+ return v4l2_subdev_call(sd, core, subscribe_event, fh, arg);
+
+ case VIDIOC_UNSUBSCRIBE_EVENT:
+ return v4l2_subdev_call(sd, core, unsubscribe_event, fh, arg);
+
default:
return -ENOIOCTLCMD;
}
@@ -78,11 +136,29 @@
return video_usercopy(file, cmd, arg, subdev_do_ioctl);
}
+static unsigned int subdev_poll(struct file *file, poll_table *wait)
+{
+ struct video_device *vdev = video_devdata(file);
+ struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
+ struct v4l2_fh *fh = file->private_data;
+
+ if (!(sd->flags & V4L2_SUBDEV_FL_HAS_EVENTS))
+ return POLLERR;
+
+ poll_wait(file, &fh->events->wait, wait);
+
+ if (v4l2_event_pending(fh))
+ return POLLPRI;
+
+ return 0;
+}
+
const struct v4l2_file_operations v4l2_subdev_fops = {
.owner = THIS_MODULE,
.open = subdev_open,
.unlocked_ioctl = subdev_ioctl,
.release = subdev_close,
+ .poll = subdev_poll,
};
void v4l2_subdev_init(struct v4l2_subdev *sd, const struct v4l2_subdev_ops *ops)