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/*
* V4L2 sub-device
*
* Copyright (C) 2010 Nokia Corporation
*
* Contact: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
* Sakari Ailus <sakari.ailus@iki.fi>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#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;
}
static long subdev_do_ioctl(struct file *file, unsigned int cmd, void *arg)
{
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:
return v4l2_subdev_queryctrl(sd, arg);
case VIDIOC_QUERYMENU:
return v4l2_subdev_querymenu(sd, arg);
case VIDIOC_G_CTRL:
return v4l2_subdev_g_ctrl(sd, arg);
case VIDIOC_S_CTRL:
return v4l2_subdev_s_ctrl(sd, arg);
case VIDIOC_G_EXT_CTRLS:
return v4l2_subdev_g_ext_ctrls(sd, arg);
case VIDIOC_S_EXT_CTRLS:
return v4l2_subdev_s_ext_ctrls(sd, arg);
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;
}
return 0;
}
static long subdev_ioctl(struct file *file, unsigned int cmd,
unsigned long arg)
{
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)
{
INIT_LIST_HEAD(&sd->list);
BUG_ON(!ops);
sd->ops = ops;
sd->v4l2_dev = NULL;
sd->flags = 0;
sd->name[0] = '\0';
sd->grp_id = 0;
sd->dev_priv = NULL;
sd->host_priv = NULL;
}
EXPORT_SYMBOL(v4l2_subdev_init);
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