[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_fh_init(struct v4l2_subdev_fh *fh, struct v4l2_subdev *sd)
{
#if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
	/* Allocate try format and crop in the same memory block */
	fh->try_fmt = kzalloc((sizeof(*fh->try_fmt) + sizeof(*fh->try_crop))
			      * sd->entity.num_pads, GFP_KERNEL);
	if (fh->try_fmt == NULL)
		return -ENOMEM;

	fh->try_crop = (struct v4l2_rect *)
		(fh->try_fmt + sd->entity.num_pads);
#endif
	return 0;
}

static void subdev_fh_free(struct v4l2_subdev_fh *fh)
{
#if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
	kfree(fh->try_fmt);
	fh->try_fmt = NULL;
	fh->try_crop = NULL;
#endif
}

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_subdev_fh *subdev_fh;
#if defined(CONFIG_MEDIA_CONTROLLER)
	struct media_entity *entity = NULL;
#endif
	int ret;

	subdev_fh = kzalloc(sizeof(*subdev_fh), GFP_KERNEL);
	if (subdev_fh == NULL)
		return -ENOMEM;

	ret = subdev_fh_init(subdev_fh, sd);
	if (ret) {
		kfree(subdev_fh);
		return ret;
	}

	v4l2_fh_init(&subdev_fh->vfh, vdev);
	v4l2_fh_add(&subdev_fh->vfh);
	file->private_data = &subdev_fh->vfh;
#if defined(CONFIG_MEDIA_CONTROLLER)
	if (sd->v4l2_dev->mdev) {
		entity = media_entity_get(&sd->entity);
		if (!entity) {
			ret = -EBUSY;
			goto err;
		}
	}
#endif

	if (sd->internal_ops && sd->internal_ops->open) {
		ret = sd->internal_ops->open(sd, subdev_fh);
		if (ret < 0)
			goto err;
	}

	return 0;

err:
#if defined(CONFIG_MEDIA_CONTROLLER)
	if (entity)
		media_entity_put(entity);
#endif
	v4l2_fh_del(&subdev_fh->vfh);
	v4l2_fh_exit(&subdev_fh->vfh);
	subdev_fh_free(subdev_fh);
	kfree(subdev_fh);

	return ret;
}

static int subdev_close(struct file *file)
{
	struct video_device *vdev = video_devdata(file);
	struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
	struct v4l2_fh *vfh = file->private_data;
	struct v4l2_subdev_fh *subdev_fh = to_v4l2_subdev_fh(vfh);

	if (sd->internal_ops && sd->internal_ops->close)
		sd->internal_ops->close(sd, subdev_fh);
#if defined(CONFIG_MEDIA_CONTROLLER)
	if (sd->v4l2_dev->mdev)
		media_entity_put(&sd->entity);
#endif
	v4l2_fh_del(vfh);
	v4l2_fh_exit(vfh);
	subdev_fh_free(subdev_fh);
	kfree(subdev_fh);
	file->private_data = NULL;

	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 *vfh = file->private_data;
#if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
	struct v4l2_subdev_fh *subdev_fh = to_v4l2_subdev_fh(vfh);
#endif

	switch (cmd) {
	case VIDIOC_QUERYCTRL:
		return v4l2_queryctrl(vfh->ctrl_handler, arg);

	case VIDIOC_QUERYMENU:
		return v4l2_querymenu(vfh->ctrl_handler, arg);

	case VIDIOC_G_CTRL:
		return v4l2_g_ctrl(vfh->ctrl_handler, arg);

	case VIDIOC_S_CTRL:
		return v4l2_s_ctrl(vfh, vfh->ctrl_handler, arg);

	case VIDIOC_G_EXT_CTRLS:
		return v4l2_g_ext_ctrls(vfh->ctrl_handler, arg);

	case VIDIOC_S_EXT_CTRLS:
		return v4l2_s_ext_ctrls(vfh, vfh->ctrl_handler, arg);

	case VIDIOC_TRY_EXT_CTRLS:
		return v4l2_try_ext_ctrls(vfh->ctrl_handler, arg);

	case VIDIOC_DQEVENT:
		if (!(sd->flags & V4L2_SUBDEV_FL_HAS_EVENTS))
			return -ENOIOCTLCMD;

		return v4l2_event_dequeue(vfh, arg, file->f_flags & O_NONBLOCK);

	case VIDIOC_SUBSCRIBE_EVENT:
		return v4l2_subdev_call(sd, core, subscribe_event, vfh, arg);

	case VIDIOC_UNSUBSCRIBE_EVENT:
		return v4l2_subdev_call(sd, core, unsubscribe_event, vfh, arg);
#if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
	case VIDIOC_SUBDEV_G_FMT: {
		struct v4l2_subdev_format *format = arg;

		if (format->which != V4L2_SUBDEV_FORMAT_TRY &&
		    format->which != V4L2_SUBDEV_FORMAT_ACTIVE)
			return -EINVAL;

		if (format->pad >= sd->entity.num_pads)
			return -EINVAL;

		return v4l2_subdev_call(sd, pad, get_fmt, subdev_fh, format);
	}

	case VIDIOC_SUBDEV_S_FMT: {
		struct v4l2_subdev_format *format = arg;

		if (format->which != V4L2_SUBDEV_FORMAT_TRY &&
		    format->which != V4L2_SUBDEV_FORMAT_ACTIVE)
			return -EINVAL;

		if (format->pad >= sd->entity.num_pads)
			return -EINVAL;

		return v4l2_subdev_call(sd, pad, set_fmt, subdev_fh, format);
	}

	case VIDIOC_SUBDEV_G_CROP: {
		struct v4l2_subdev_crop *crop = arg;

		if (crop->which != V4L2_SUBDEV_FORMAT_TRY &&
		    crop->which != V4L2_SUBDEV_FORMAT_ACTIVE)
			return -EINVAL;

		if (crop->pad >= sd->entity.num_pads)
			return -EINVAL;

		return v4l2_subdev_call(sd, pad, get_crop, subdev_fh, crop);
	}

	case VIDIOC_SUBDEV_S_CROP: {
		struct v4l2_subdev_crop *crop = arg;

		if (crop->which != V4L2_SUBDEV_FORMAT_TRY &&
		    crop->which != V4L2_SUBDEV_FORMAT_ACTIVE)
			return -EINVAL;

		if (crop->pad >= sd->entity.num_pads)
			return -EINVAL;

		return v4l2_subdev_call(sd, pad, set_crop, subdev_fh, crop);
	}

	case VIDIOC_SUBDEV_ENUM_MBUS_CODE: {
		struct v4l2_subdev_mbus_code_enum *code = arg;

		if (code->pad >= sd->entity.num_pads)
			return -EINVAL;

		return v4l2_subdev_call(sd, pad, enum_mbus_code, subdev_fh,
					code);
	}

	case VIDIOC_SUBDEV_ENUM_FRAME_SIZE: {
		struct v4l2_subdev_frame_size_enum *fse = arg;

		if (fse->pad >= sd->entity.num_pads)
			return -EINVAL;

		return v4l2_subdev_call(sd, pad, enum_frame_size, subdev_fh,
					fse);
	}

	case VIDIOC_SUBDEV_G_FRAME_INTERVAL:
		return v4l2_subdev_call(sd, video, g_frame_interval, arg);

	case VIDIOC_SUBDEV_S_FRAME_INTERVAL:
		return v4l2_subdev_call(sd, video, s_frame_interval, arg);

	case VIDIOC_SUBDEV_ENUM_FRAME_INTERVAL: {
		struct v4l2_subdev_frame_interval_enum *fie = arg;

		if (fie->pad >= sd->entity.num_pads)
			return -EINVAL;

		return v4l2_subdev_call(sd, pad, enum_frame_interval, subdev_fh,
					fie);
	}
#endif
	default:
		return v4l2_subdev_call(sd, core, ioctl, cmd, arg);
	}

	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->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;
#if defined(CONFIG_MEDIA_CONTROLLER)
	sd->entity.name = sd->name;
	sd->entity.type = MEDIA_ENT_T_V4L2_SUBDEV;
#endif
}
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	33
7cd5a16b SV	34	static int subdev_fh_init(struct v4l2_subdev_fh fh, struct v4l2_subdev sd)
	35	{
	36	#if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
	37	/* Allocate try format and crop in the same memory block */
	38	fh->try_fmt = kzalloc((sizeof(fh->try_fmt) + sizeof(fh->try_crop))
	39	* sd->entity.num_pads, GFP_KERNEL);
	40	if (fh->try_fmt == NULL)
	41	return -ENOMEM;
	42
	43	fh->try_crop = (struct v4l2_rect *)
	44	(fh->try_fmt + sd->entity.num_pads);
	45	#endif
	46	return 0;
	47	}
	48
	49	static void subdev_fh_free(struct v4l2_subdev_fh *fh)
	50	{
	51	#if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
	52	kfree(fh->try_fmt);
	53	fh->try_fmt = NULL;
	54	fh->try_crop = NULL;
	55	#endif
	56	}
	57
2096a5dc LP	58	static int subdev_open(struct file *file)
2096a5dc LP	59	{
02adb1cc SA	60	struct video_device *vdev = video_devdata(file);
02adb1cc SA	61	struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
7cd5a16b	62	struct v4l2_subdev_fh *subdev_fh;
61f5db54	63	#if defined(CONFIG_MEDIA_CONTROLLER)
f0beea8f	64	struct media_entity *entity = NULL;
61f5db54	65	#endif
02adb1cc SA	66	int ret;
02adb1cc SA	67
7cd5a16b SV	68	subdev_fh = kzalloc(sizeof(*subdev_fh), GFP_KERNEL);
	69	if (subdev_fh == NULL)
	70	return -ENOMEM;
02adb1cc	71
7cd5a16b SV	72	ret = subdev_fh_init(subdev_fh, sd);
	73	if (ret) {
	74	kfree(subdev_fh);
	75	return ret;
	76	}
	77
523f46d6	78	v4l2_fh_init(&subdev_fh->vfh, vdev);
7cd5a16b SV	79	v4l2_fh_add(&subdev_fh->vfh);
7cd5a16b SV	80	file->private_data = &subdev_fh->vfh;
61f5db54 LP	81	#if defined(CONFIG_MEDIA_CONTROLLER)
	82	if (sd->v4l2_dev->mdev) {
	83	entity = media_entity_get(&sd->entity);
	84	if (!entity) {
	85	ret = -EBUSY;
	86	goto err;
	87	}
	88	}
	89	#endif
7cd5a16b	90
f0beea8f LP	91	if (sd->internal_ops && sd->internal_ops->open) {
	92	ret = sd->internal_ops->open(sd, subdev_fh);
	93	if (ret < 0)
	94	goto err;
	95	}
	96
2096a5dc	97	return 0;
02adb1cc SA	98
02adb1cc SA	99	err:
f0beea8f LP	100	#if defined(CONFIG_MEDIA_CONTROLLER)
	101	if (entity)
	102	media_entity_put(entity);
	103	#endif
7cd5a16b SV	104	v4l2_fh_del(&subdev_fh->vfh);
	105	v4l2_fh_exit(&subdev_fh->vfh);
	106	subdev_fh_free(subdev_fh);
	107	kfree(subdev_fh);
02adb1cc SA	108
02adb1cc SA	109	return ret;
2096a5dc LP	110	}
	111
	112	static int subdev_close(struct file *file)
	113	{
61f5db54 LP	114	struct video_device *vdev = video_devdata(file);
61f5db54 LP	115	struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
02adb1cc	116	struct v4l2_fh *vfh = file->private_data;
7cd5a16b	117	struct v4l2_subdev_fh *subdev_fh = to_v4l2_subdev_fh(vfh);
02adb1cc	118
f0beea8f LP	119	if (sd->internal_ops && sd->internal_ops->close)
f0beea8f LP	120	sd->internal_ops->close(sd, subdev_fh);
61f5db54 LP	121	#if defined(CONFIG_MEDIA_CONTROLLER)
	122	if (sd->v4l2_dev->mdev)
	123	media_entity_put(&sd->entity);
	124	#endif
7cd5a16b SV	125	v4l2_fh_del(vfh);
	126	v4l2_fh_exit(vfh);
	127	subdev_fh_free(subdev_fh);
	128	kfree(subdev_fh);
	129	file->private_data = NULL;
02adb1cc	130
2096a5dc LP	131	return 0;
	132	}
	133
	134	static long subdev_do_ioctl(struct file file, unsigned int cmd, void arg)
	135	{
ea8aa434 LP	136	struct video_device *vdev = video_devdata(file);
ea8aa434 LP	137	struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
7cd5a16b	138	struct v4l2_fh *vfh = file->private_data;
333c8b97 LP	139	#if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
	140	struct v4l2_subdev_fh *subdev_fh = to_v4l2_subdev_fh(vfh);
	141	#endif
ea8aa434	142
2096a5dc	143	switch (cmd) {
ea8aa434	144	case VIDIOC_QUERYCTRL:
18d171ba	145	return v4l2_queryctrl(vfh->ctrl_handler, arg);
ea8aa434 LP	146
ea8aa434 LP	147	case VIDIOC_QUERYMENU:
18d171ba	148	return v4l2_querymenu(vfh->ctrl_handler, arg);
ea8aa434 LP	149
ea8aa434 LP	150	case VIDIOC_G_CTRL:
18d171ba	151	return v4l2_g_ctrl(vfh->ctrl_handler, arg);
ea8aa434 LP	152
ea8aa434 LP	153	case VIDIOC_S_CTRL:
ab892bac	154	return v4l2_s_ctrl(vfh, vfh->ctrl_handler, arg);
ea8aa434 LP	155
ea8aa434 LP	156	case VIDIOC_G_EXT_CTRLS:
18d171ba	157	return v4l2_g_ext_ctrls(vfh->ctrl_handler, arg);
ea8aa434 LP	158
ea8aa434 LP	159	case VIDIOC_S_EXT_CTRLS:
ab892bac	160	return v4l2_s_ext_ctrls(vfh, vfh->ctrl_handler, arg);
ea8aa434 LP	161
ea8aa434 LP	162	case VIDIOC_TRY_EXT_CTRLS:
18d171ba	163	return v4l2_try_ext_ctrls(vfh->ctrl_handler, arg);
ea8aa434	164
02adb1cc SA	165	case VIDIOC_DQEVENT:
	166	if (!(sd->flags & V4L2_SUBDEV_FL_HAS_EVENTS))
	167	return -ENOIOCTLCMD;
	168
7cd5a16b	169	return v4l2_event_dequeue(vfh, arg, file->f_flags & O_NONBLOCK);
02adb1cc SA	170
02adb1cc SA	171	case VIDIOC_SUBSCRIBE_EVENT:
7cd5a16b	172	return v4l2_subdev_call(sd, core, subscribe_event, vfh, arg);
02adb1cc SA	173
02adb1cc SA	174	case VIDIOC_UNSUBSCRIBE_EVENT:
7cd5a16b	175	return v4l2_subdev_call(sd, core, unsubscribe_event, vfh, arg);
333c8b97 LP	176	#if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
	177	case VIDIOC_SUBDEV_G_FMT: {
	178	struct v4l2_subdev_format *format = arg;
	179
	180	if (format->which != V4L2_SUBDEV_FORMAT_TRY &&
	181	format->which != V4L2_SUBDEV_FORMAT_ACTIVE)
	182	return -EINVAL;
	183
	184	if (format->pad >= sd->entity.num_pads)
	185	return -EINVAL;
	186
	187	return v4l2_subdev_call(sd, pad, get_fmt, subdev_fh, format);
	188	}
	189
	190	case VIDIOC_SUBDEV_S_FMT: {
	191	struct v4l2_subdev_format *format = arg;
	192
	193	if (format->which != V4L2_SUBDEV_FORMAT_TRY &&
	194	format->which != V4L2_SUBDEV_FORMAT_ACTIVE)
	195	return -EINVAL;
	196
	197	if (format->pad >= sd->entity.num_pads)
	198	return -EINVAL;
02adb1cc	199
333c8b97 LP	200	return v4l2_subdev_call(sd, pad, set_fmt, subdev_fh, format);
	201	}
	202
f6a5cb1b AK	203	case VIDIOC_SUBDEV_G_CROP: {
	204	struct v4l2_subdev_crop *crop = arg;
	205
	206	if (crop->which != V4L2_SUBDEV_FORMAT_TRY &&
	207	crop->which != V4L2_SUBDEV_FORMAT_ACTIVE)
	208	return -EINVAL;
	209
	210	if (crop->pad >= sd->entity.num_pads)
	211	return -EINVAL;
	212
	213	return v4l2_subdev_call(sd, pad, get_crop, subdev_fh, crop);
	214	}
	215
	216	case VIDIOC_SUBDEV_S_CROP: {
	217	struct v4l2_subdev_crop *crop = arg;
	218
	219	if (crop->which != V4L2_SUBDEV_FORMAT_TRY &&
	220	crop->which != V4L2_SUBDEV_FORMAT_ACTIVE)
	221	return -EINVAL;
	222
	223	if (crop->pad >= sd->entity.num_pads)
	224	return -EINVAL;
	225
	226	return v4l2_subdev_call(sd, pad, set_crop, subdev_fh, crop);
	227	}
	228
333c8b97 LP	229	case VIDIOC_SUBDEV_ENUM_MBUS_CODE: {
	230	struct v4l2_subdev_mbus_code_enum *code = arg;
	231
	232	if (code->pad >= sd->entity.num_pads)
	233	return -EINVAL;
	234
	235	return v4l2_subdev_call(sd, pad, enum_mbus_code, subdev_fh,
	236	code);
	237	}
	238
	239	case VIDIOC_SUBDEV_ENUM_FRAME_SIZE: {
	240	struct v4l2_subdev_frame_size_enum *fse = arg;
	241
	242	if (fse->pad >= sd->entity.num_pads)
	243	return -EINVAL;
	244
	245	return v4l2_subdev_call(sd, pad, enum_frame_size, subdev_fh,
	246	fse);
	247	}
35c3017a LP	248
	249	case VIDIOC_SUBDEV_G_FRAME_INTERVAL:
	250	return v4l2_subdev_call(sd, video, g_frame_interval, arg);
	251
	252	case VIDIOC_SUBDEV_S_FRAME_INTERVAL:
	253	return v4l2_subdev_call(sd, video, s_frame_interval, arg);
	254
	255	case VIDIOC_SUBDEV_ENUM_FRAME_INTERVAL: {
	256	struct v4l2_subdev_frame_interval_enum *fie = arg;
	257
	258	if (fie->pad >= sd->entity.num_pads)
	259	return -EINVAL;
	260
	261	return v4l2_subdev_call(sd, pad, enum_frame_interval, subdev_fh,
	262	fie);
	263	}
333c8b97	264	#endif
2096a5dc	265	default:
c30b46e5	266	return v4l2_subdev_call(sd, core, ioctl, cmd, arg);
2096a5dc LP	267	}
	268
	269	return 0;
	270	}
	271
	272	static long subdev_ioctl(struct file *file, unsigned int cmd,
	273	unsigned long arg)
	274	{
	275	return video_usercopy(file, cmd, arg, subdev_do_ioctl);
	276	}
	277
02adb1cc SA	278	static unsigned int subdev_poll(struct file file, poll_table wait)
	279	{
	280	struct video_device *vdev = video_devdata(file);
	281	struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
	282	struct v4l2_fh *fh = file->private_data;
	283
	284	if (!(sd->flags & V4L2_SUBDEV_FL_HAS_EVENTS))
	285	return POLLERR;
	286
523f46d6	287	poll_wait(file, &fh->wait, wait);
02adb1cc SA	288
	289	if (v4l2_event_pending(fh))
	290	return POLLPRI;
	291
	292	return 0;
	293	}
	294
2096a5dc LP	295	const struct v4l2_file_operations v4l2_subdev_fops = {
	296	.owner = THIS_MODULE,
	297	.open = subdev_open,
	298	.unlocked_ioctl = subdev_ioctl,
	299	.release = subdev_close,
02adb1cc	300	.poll = subdev_poll,
2096a5dc	301	};
3dd5ee08 LP	302
	303	void v4l2_subdev_init(struct v4l2_subdev sd, const struct v4l2_subdev_ops ops)
	304	{
	305	INIT_LIST_HEAD(&sd->list);
	306	BUG_ON(!ops);
	307	sd->ops = ops;
	308	sd->v4l2_dev = NULL;
	309	sd->flags = 0;
	310	sd->name[0] = '\0';
	311	sd->grp_id = 0;
	312	sd->dev_priv = NULL;
	313	sd->host_priv = NULL;
61f5db54 LP	314	#if defined(CONFIG_MEDIA_CONTROLLER)
	315	sd->entity.name = sd->name;
	316	sd->entity.type = MEDIA_ENT_T_V4L2_SUBDEV;
	317	#endif
3dd5ee08 LP	318	}
3dd5ee08 LP	319	EXPORT_SYMBOL(v4l2_subdev_init);