drivers/media/video/v4l2-subdev.c - kernel/msm-4.19 - Gitiles

 /*
  * 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 <linux/export.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);

 #ifdef CONFIG_VIDEO_ADV_DEBUG
 	case VIDIOC_DBG_G_REGISTER:
 	{
 		struct v4l2_dbg_register *p = arg;

 		if (!capable(CAP_SYS_ADMIN))
 			return -EPERM;
 		return v4l2_subdev_call(sd, core, g_register, p);
 	}
 	case VIDIOC_DBG_S_REGISTER:
 	{
 		struct v4l2_dbg_register *p = arg;

 		if (!capable(CAP_SYS_ADMIN))
 			return -EPERM;
 		return v4l2_subdev_call(sd, core, s_register, p);
 	}
 #endif

 	case VIDIOC_LOG_STATUS: {
 		int ret;

 		pr_info("%s: =================  START STATUS  =================\n",
 			sd->name);
 		ret = v4l2_subdev_call(sd, core, log_status);
 		pr_info("%s: ==================  END STATUS  ==================\n",
 			sd->name);
 		return ret;
 	}

 #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);
	/*
	* 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 <linux/export.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);

	#ifdef CONFIG_VIDEO_ADV_DEBUG
	case VIDIOC_DBG_G_REGISTER:
	{
	struct v4l2_dbg_register *p = arg;

	if (!capable(CAP_SYS_ADMIN))
	return -EPERM;
	return v4l2_subdev_call(sd, core, g_register, p);
	}
	case VIDIOC_DBG_S_REGISTER:
	{
	struct v4l2_dbg_register *p = arg;

	if (!capable(CAP_SYS_ADMIN))
	return -EPERM;
	return v4l2_subdev_call(sd, core, s_register, p);
	}
	#endif

	case VIDIOC_LOG_STATUS: {
	int ret;

	pr_info("%s: ================= START STATUS =================\n",
	sd->name);
	ret = v4l2_subdev_call(sd, core, log_status);
	pr_info("%s: ================== END STATUS ==================\n",
	sd->name);
	return ret;
	}

	#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);