[deliverable/linux.git] / drivers / media / video / v4l2-subdev.c

/*
 * 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);
Commit	Line	Data
2096a5dc	1	/*
3dd5ee08	2	* V4L2 sub-device
2096a5dc	3	*
3dd5ee08	4	* Copyright (C) 2010 Nokia Corporation
2096a5dc	5	*
3dd5ee08 LP	6	* Contact: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
3dd5ee08 LP	7	* Sakari Ailus <sakari.ailus@iki.fi>
2096a5dc	8	*
3dd5ee08 LP	9	* This program is free software; you can redistribute it and/or modify
	10	* it under the terms of the GNU General Public License version 2 as
	11	* published by the Free Software Foundation.
2096a5dc	12	*
3dd5ee08 LP	13	* This program is distributed in the hope that it will be useful,
	14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	16	* GNU General Public License for more details.
2096a5dc	17	*
3dd5ee08 LP	18	* You should have received a copy of the GNU General Public License
	19	* along with this program; if not, write to the Free Software
	20	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
2096a5dc LP	21	*/
2096a5dc LP	22
2096a5dc	23	#include <linux/ioctl.h>
02adb1cc SA	24	#include <linux/slab.h>
02adb1cc SA	25	#include <linux/types.h>
2096a5dc LP	26	#include <linux/videodev2.h>
2096a5dc LP	27
ea8aa434	28	#include <media/v4l2-ctrls.h>
2096a5dc LP	29	#include <media/v4l2-device.h>
2096a5dc LP	30	#include <media/v4l2-ioctl.h>
02adb1cc SA	31	#include <media/v4l2-fh.h>
02adb1cc SA	32	#include <media/v4l2-event.h>
2096a5dc LP	33
	34	static int subdev_open(struct file *file)
	35	{
02adb1cc SA	36	struct video_device *vdev = video_devdata(file);
	37	struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
	38	struct v4l2_fh *vfh;
	39	int ret;
	40
	41	if (sd->flags & V4L2_SUBDEV_FL_HAS_EVENTS) {
	42	vfh = kzalloc(sizeof(*vfh), GFP_KERNEL);
	43	if (vfh == NULL)
	44	return -ENOMEM;
	45
	46	ret = v4l2_fh_init(vfh, vdev);
	47	if (ret)
	48	goto err;
	49
	50	ret = v4l2_event_init(vfh);
	51	if (ret)
	52	goto err;
	53
	54	ret = v4l2_event_alloc(vfh, sd->nevents);
	55	if (ret)
	56	goto err;
	57
	58	v4l2_fh_add(vfh);
	59	file->private_data = vfh;
	60	}
	61
2096a5dc	62	return 0;
02adb1cc SA	63
	64	err:
	65	if (vfh != NULL) {
	66	v4l2_fh_exit(vfh);
	67	kfree(vfh);
	68	}
	69
	70	return ret;
2096a5dc LP	71	}
	72
	73	static int subdev_close(struct file *file)
	74	{
02adb1cc SA	75	struct v4l2_fh *vfh = file->private_data;
	76
	77	if (vfh != NULL) {
	78	v4l2_fh_del(vfh);
	79	v4l2_fh_exit(vfh);
	80	kfree(vfh);
	81	}
	82
2096a5dc LP	83	return 0;
	84	}
	85
	86	static long subdev_do_ioctl(struct file file, unsigned int cmd, void arg)
	87	{
ea8aa434 LP	88	struct video_device *vdev = video_devdata(file);
ea8aa434 LP	89	struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
02adb1cc	90	struct v4l2_fh *fh = file->private_data;
ea8aa434	91
2096a5dc	92	switch (cmd) {
ea8aa434 LP	93	case VIDIOC_QUERYCTRL:
	94	return v4l2_subdev_queryctrl(sd, arg);
	95
	96	case VIDIOC_QUERYMENU:
	97	return v4l2_subdev_querymenu(sd, arg);
	98
	99	case VIDIOC_G_CTRL:
	100	return v4l2_subdev_g_ctrl(sd, arg);
	101
	102	case VIDIOC_S_CTRL:
	103	return v4l2_subdev_s_ctrl(sd, arg);
	104
	105	case VIDIOC_G_EXT_CTRLS:
	106	return v4l2_subdev_g_ext_ctrls(sd, arg);
	107
	108	case VIDIOC_S_EXT_CTRLS:
	109	return v4l2_subdev_s_ext_ctrls(sd, arg);
	110
	111	case VIDIOC_TRY_EXT_CTRLS:
	112	return v4l2_subdev_try_ext_ctrls(sd, arg);
	113
02adb1cc SA	114	case VIDIOC_DQEVENT:
	115	if (!(sd->flags & V4L2_SUBDEV_FL_HAS_EVENTS))
	116	return -ENOIOCTLCMD;
	117
	118	return v4l2_event_dequeue(fh, arg, file->f_flags & O_NONBLOCK);
	119
	120	case VIDIOC_SUBSCRIBE_EVENT:
	121	return v4l2_subdev_call(sd, core, subscribe_event, fh, arg);
	122
	123	case VIDIOC_UNSUBSCRIBE_EVENT:
	124	return v4l2_subdev_call(sd, core, unsubscribe_event, fh, arg);
	125
2096a5dc LP	126	default:
	127	return -ENOIOCTLCMD;
	128	}
	129
	130	return 0;
	131	}
	132
	133	static long subdev_ioctl(struct file *file, unsigned int cmd,
	134	unsigned long arg)
	135	{
	136	return video_usercopy(file, cmd, arg, subdev_do_ioctl);
	137	}
	138
02adb1cc SA	139	static unsigned int subdev_poll(struct file file, poll_table wait)
	140	{
	141	struct video_device *vdev = video_devdata(file);
	142	struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
	143	struct v4l2_fh *fh = file->private_data;
	144
	145	if (!(sd->flags & V4L2_SUBDEV_FL_HAS_EVENTS))
	146	return POLLERR;
	147
	148	poll_wait(file, &fh->events->wait, wait);
	149
	150	if (v4l2_event_pending(fh))
	151	return POLLPRI;
	152
	153	return 0;
	154	}
	155
2096a5dc LP	156	const struct v4l2_file_operations v4l2_subdev_fops = {
	157	.owner = THIS_MODULE,
	158	.open = subdev_open,
	159	.unlocked_ioctl = subdev_ioctl,
	160	.release = subdev_close,
02adb1cc	161	.poll = subdev_poll,
2096a5dc	162	};
3dd5ee08 LP	163
	164	void v4l2_subdev_init(struct v4l2_subdev sd, const struct v4l2_subdev_ops ops)
	165	{
	166	INIT_LIST_HEAD(&sd->list);
	167	BUG_ON(!ops);
	168	sd->ops = ops;
	169	sd->v4l2_dev = NULL;
	170	sd->flags = 0;
	171	sd->name[0] = '\0';
	172	sd->grp_id = 0;
	173	sd->dev_priv = NULL;
	174	sd->host_priv = NULL;
	175	}
	176	EXPORT_SYMBOL(v4l2_subdev_init);