[deliverable/linux.git] / drivers / media / v4l2-core / v4l2-device.c

/*
    V4L2 device support.

    Copyright (C) 2008  Hans Verkuil <hverkuil@xs4all.nl>

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    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/types.h>
#include <linux/ioctl.h>
#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/slab.h>
#if defined(CONFIG_SPI)
#include <linux/spi/spi.h>
#endif
#include <linux/videodev2.h>
#include <media/v4l2-device.h>
#include <media/v4l2-ctrls.h>

int v4l2_device_register(struct device *dev, struct v4l2_device *v4l2_dev)
{
	if (v4l2_dev == NULL)
		return -EINVAL;

	INIT_LIST_HEAD(&v4l2_dev->subdevs);
	spin_lock_init(&v4l2_dev->lock);
	v4l2_prio_init(&v4l2_dev->prio);
	kref_init(&v4l2_dev->ref);
	get_device(dev);
	v4l2_dev->dev = dev;
	if (dev == NULL) {
		/* If dev == NULL, then name must be filled in by the caller */
		if (WARN_ON(!v4l2_dev->name[0]))
			return -EINVAL;
		return 0;
	}

	/* Set name to driver name + device name if it is empty. */
	if (!v4l2_dev->name[0])
		snprintf(v4l2_dev->name, sizeof(v4l2_dev->name), "%s %s",
			dev->driver->name, dev_name(dev));
	if (!dev_get_drvdata(dev))
		dev_set_drvdata(dev, v4l2_dev);
	return 0;
}
EXPORT_SYMBOL_GPL(v4l2_device_register);

static void v4l2_device_release(struct kref *ref)
{
	struct v4l2_device *v4l2_dev =
		container_of(ref, struct v4l2_device, ref);

	if (v4l2_dev->release)
		v4l2_dev->release(v4l2_dev);
}

int v4l2_device_put(struct v4l2_device *v4l2_dev)
{
	return kref_put(&v4l2_dev->ref, v4l2_device_release);
}
EXPORT_SYMBOL_GPL(v4l2_device_put);

int v4l2_device_set_name(struct v4l2_device *v4l2_dev, const char *basename,
						atomic_t *instance)
{
	int num = atomic_inc_return(instance) - 1;
	int len = strlen(basename);

	if (basename[len - 1] >= '0' && basename[len - 1] <= '9')
		snprintf(v4l2_dev->name, sizeof(v4l2_dev->name),
				"%s-%d", basename, num);
	else
		snprintf(v4l2_dev->name, sizeof(v4l2_dev->name),
				"%s%d", basename, num);
	return num;
}
EXPORT_SYMBOL_GPL(v4l2_device_set_name);

void v4l2_device_disconnect(struct v4l2_device *v4l2_dev)
{
	if (v4l2_dev->dev == NULL)
		return;

	if (dev_get_drvdata(v4l2_dev->dev) == v4l2_dev)
		dev_set_drvdata(v4l2_dev->dev, NULL);
	put_device(v4l2_dev->dev);
	v4l2_dev->dev = NULL;
}
EXPORT_SYMBOL_GPL(v4l2_device_disconnect);

void v4l2_device_unregister(struct v4l2_device *v4l2_dev)
{
	struct v4l2_subdev *sd, *next;

	/* Just return if v4l2_dev is NULL or if it was already
	 * unregistered before. */
	if (v4l2_dev == NULL || !v4l2_dev->name[0])
		return;
	v4l2_device_disconnect(v4l2_dev);

	/* Unregister subdevs */
	list_for_each_entry_safe(sd, next, &v4l2_dev->subdevs, list) {
		v4l2_device_unregister_subdev(sd);
#if IS_ENABLED(CONFIG_I2C)
		if (sd->flags & V4L2_SUBDEV_FL_IS_I2C) {
			struct i2c_client *client = v4l2_get_subdevdata(sd);

			/*
			 * We need to unregister the i2c client
			 * explicitly. We cannot rely on
			 * i2c_del_adapter to always unregister
			 * clients for us, since if the i2c bus is a
			 * platform bus, then it is never deleted.
			 *
			 * Device tree or ACPI based devices must not
			 * be unregistered as they have not been
			 * registered by us, and would not be
			 * re-created by just probing the V4L2 driver.
			 */
			if (client &&
			    !client->dev.of_node && !client->dev.fwnode)
				i2c_unregister_device(client);
			continue;
		}
#endif
#if defined(CONFIG_SPI)
		if (sd->flags & V4L2_SUBDEV_FL_IS_SPI) {
			struct spi_device *spi = v4l2_get_subdevdata(sd);

			if (spi && !spi->dev.of_node && !spi->dev.fwnode)
				spi_unregister_device(spi);
			continue;
		}
#endif
	}
	/* Mark as unregistered, thus preventing duplicate unregistrations */
	v4l2_dev->name[0] = '\0';
}
EXPORT_SYMBOL_GPL(v4l2_device_unregister);

int v4l2_device_register_subdev(struct v4l2_device *v4l2_dev,
				struct v4l2_subdev *sd)
{
#if defined(CONFIG_MEDIA_CONTROLLER)
	struct media_entity *entity = &sd->entity;
#endif
	int err;

	/* Check for valid input */
	if (v4l2_dev == NULL || sd == NULL || !sd->name[0])
		return -EINVAL;

	/* Warn if we apparently re-register a subdev */
	WARN_ON(sd->v4l2_dev != NULL);

	/*
	 * The reason to acquire the module here is to avoid unloading
	 * a module of sub-device which is registered to a media
	 * device. To make it possible to unload modules for media
	 * devices that also register sub-devices, do not
	 * try_module_get() such sub-device owners.
	 */
	sd->owner_v4l2_dev = v4l2_dev->dev && v4l2_dev->dev->driver &&
		sd->owner == v4l2_dev->dev->driver->owner;

	if (!sd->owner_v4l2_dev && !try_module_get(sd->owner))
		return -ENODEV;

	sd->v4l2_dev = v4l2_dev;
	/* This just returns 0 if either of the two args is NULL */
	err = v4l2_ctrl_add_handler(v4l2_dev->ctrl_handler, sd->ctrl_handler, NULL);
	if (err)
		goto error_module;

#if defined(CONFIG_MEDIA_CONTROLLER)
	/* Register the entity. */
	if (v4l2_dev->mdev) {
		err = media_device_register_entity(v4l2_dev->mdev, entity);
		if (err < 0)
			goto error_module;
	}
#endif

	if (sd->internal_ops && sd->internal_ops->registered) {
		err = sd->internal_ops->registered(sd);
		if (err)
			goto error_unregister;
	}

	spin_lock(&v4l2_dev->lock);
	list_add_tail(&sd->list, &v4l2_dev->subdevs);
	spin_unlock(&v4l2_dev->lock);

	return 0;

error_unregister:
#if defined(CONFIG_MEDIA_CONTROLLER)
	media_device_unregister_entity(entity);
#endif
error_module:
	if (!sd->owner_v4l2_dev)
		module_put(sd->owner);
	sd->v4l2_dev = NULL;
	return err;
}
EXPORT_SYMBOL_GPL(v4l2_device_register_subdev);

static void v4l2_device_release_subdev_node(struct video_device *vdev)
{
	struct v4l2_subdev *sd = video_get_drvdata(vdev);
	sd->devnode = NULL;
	kfree(vdev);
}

int v4l2_device_register_subdev_nodes(struct v4l2_device *v4l2_dev)
{
	struct video_device *vdev;
	struct v4l2_subdev *sd;
	int err;

	/* Register a device node for every subdev marked with the
	 * V4L2_SUBDEV_FL_HAS_DEVNODE flag.
	 */
	list_for_each_entry(sd, &v4l2_dev->subdevs, list) {
		if (!(sd->flags & V4L2_SUBDEV_FL_HAS_DEVNODE))
			continue;

		vdev = kzalloc(sizeof(*vdev), GFP_KERNEL);
		if (!vdev) {
			err = -ENOMEM;
			goto clean_up;
		}

		video_set_drvdata(vdev, sd);
		strlcpy(vdev->name, sd->name, sizeof(vdev->name));
		vdev->v4l2_dev = v4l2_dev;
		vdev->fops = &v4l2_subdev_fops;
		vdev->release = v4l2_device_release_subdev_node;
		vdev->ctrl_handler = sd->ctrl_handler;
		err = __video_register_device(vdev, VFL_TYPE_SUBDEV, -1, 1,
					      sd->owner);
		if (err < 0) {
			kfree(vdev);
			goto clean_up;
		}
#if defined(CONFIG_MEDIA_CONTROLLER)
		sd->entity.info.dev.major = VIDEO_MAJOR;
		sd->entity.info.dev.minor = vdev->minor;

		/* Interface is created by __video_register_device() */
		if (vdev->v4l2_dev->mdev) {
			struct media_link *link;

			link = media_create_intf_link(&sd->entity,
						      &vdev->intf_devnode->intf,
						      MEDIA_LNK_FL_ENABLED);
			if (!link) {
				err = -ENOMEM;
				goto clean_up;
			}
		}
#endif
		sd->devnode = vdev;
	}
	return 0;

clean_up:
	list_for_each_entry(sd, &v4l2_dev->subdevs, list) {
		if (!sd->devnode)
			break;
		video_unregister_device(sd->devnode);
	}

	return err;
}
EXPORT_SYMBOL_GPL(v4l2_device_register_subdev_nodes);

void v4l2_device_unregister_subdev(struct v4l2_subdev *sd)
{
	struct v4l2_device *v4l2_dev;

	/* return if it isn't registered */
	if (sd == NULL || sd->v4l2_dev == NULL)
		return;

	v4l2_dev = sd->v4l2_dev;

	spin_lock(&v4l2_dev->lock);
	list_del(&sd->list);
	spin_unlock(&v4l2_dev->lock);

	if (sd->internal_ops && sd->internal_ops->unregistered)
		sd->internal_ops->unregistered(sd);
	sd->v4l2_dev = NULL;

#if defined(CONFIG_MEDIA_CONTROLLER)
	if (v4l2_dev->mdev) {
		/*
		 * No need to explicitly remove links, as both pads and
		 * links are removed by the function below, in the right order
		 */
		media_device_unregister_entity(&sd->entity);
	}
#endif
	video_unregister_device(sd->devnode);
	if (!sd->owner_v4l2_dev)
		module_put(sd->owner);
}
EXPORT_SYMBOL_GPL(v4l2_device_unregister_subdev);
Commit	Line	Data
2a1fcdf0 HV	1	/*
	2	V4L2 device support.
	3
	4	Copyright (C) 2008 Hans Verkuil <hverkuil@xs4all.nl>
	5
	6	This program is free software; you can redistribute it and/or modify
	7	it under the terms of the GNU General Public License as published by
	8	the Free Software Foundation; either version 2 of the License, or
	9	(at your option) any later version.
	10
	11	This program is distributed in the hope that it will be useful,
	12	but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	GNU General Public License for more details.
	15
	16	You should have received a copy of the GNU General Public License
	17	along with this program; if not, write to the Free Software
	18	Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	19	*/
	20
	21	#include <linux/types.h>
	22	#include <linux/ioctl.h>
7a707b89	23	#include <linux/module.h>
2a1fcdf0	24	#include <linux/i2c.h>
3e0ec41c	25	#include <linux/slab.h>
85e09219 DB	26	#if defined(CONFIG_SPI)
	27	#include <linux/spi/spi.h>
	28	#endif
2a1fcdf0 HV	29	#include <linux/videodev2.h>
2a1fcdf0 HV	30	#include <media/v4l2-device.h>
11bbc1ca	31	#include <media/v4l2-ctrls.h>
2a1fcdf0 HV	32
	33	int v4l2_device_register(struct device dev, struct v4l2_device v4l2_dev)
	34	{
3a63e449	35	if (v4l2_dev == NULL)
2a1fcdf0	36	return -EINVAL;
3a63e449	37
2a1fcdf0 HV	38	INIT_LIST_HEAD(&v4l2_dev->subdevs);
2a1fcdf0 HV	39	spin_lock_init(&v4l2_dev->lock);
0f62fd6a	40	v4l2_prio_init(&v4l2_dev->prio);
bedf8bcf	41	kref_init(&v4l2_dev->ref);
236c5441	42	get_device(dev);
2a1fcdf0	43	v4l2_dev->dev = dev;
3a63e449 HV	44	if (dev == NULL) {
3a63e449 HV	45	/* If dev == NULL, then name must be filled in by the caller */
9e882e3b HV	46	if (WARN_ON(!v4l2_dev->name[0]))
9e882e3b HV	47	return -EINVAL;
3a63e449 HV	48	return 0;
	49	}
	50
	51	/* Set name to driver name + device name if it is empty. */
	52	if (!v4l2_dev->name[0])
	53	snprintf(v4l2_dev->name, sizeof(v4l2_dev->name), "%s %s",
c3ef01ce	54	dev->driver->name, dev_name(dev));
95db3a60 LP	55	if (!dev_get_drvdata(dev))
95db3a60 LP	56	dev_set_drvdata(dev, v4l2_dev);
2a1fcdf0 HV	57	return 0;
	58	}
	59	EXPORT_SYMBOL_GPL(v4l2_device_register);
	60
bedf8bcf HV	61	static void v4l2_device_release(struct kref *ref)
	62	{
	63	struct v4l2_device *v4l2_dev =
	64	container_of(ref, struct v4l2_device, ref);
	65
	66	if (v4l2_dev->release)
	67	v4l2_dev->release(v4l2_dev);
	68	}
	69
	70	int v4l2_device_put(struct v4l2_device *v4l2_dev)
	71	{
	72	return kref_put(&v4l2_dev->ref, v4l2_device_release);
	73	}
	74	EXPORT_SYMBOL_GPL(v4l2_device_put);
	75
102e7813 HV	76	int v4l2_device_set_name(struct v4l2_device v4l2_dev, const char basename,
	77	atomic_t *instance)
	78	{
	79	int num = atomic_inc_return(instance) - 1;
	80	int len = strlen(basename);
	81
	82	if (basename[len - 1] >= '0' && basename[len - 1] <= '9')
	83	snprintf(v4l2_dev->name, sizeof(v4l2_dev->name),
	84	"%s-%d", basename, num);
	85	else
	86	snprintf(v4l2_dev->name, sizeof(v4l2_dev->name),
	87	"%s%d", basename, num);
	88	return num;
	89	}
	90	EXPORT_SYMBOL_GPL(v4l2_device_set_name);
	91
ae6cfaac HV	92	void v4l2_device_disconnect(struct v4l2_device *v4l2_dev)
ae6cfaac HV	93	{
95db3a60 LP	94	if (v4l2_dev->dev == NULL)
	95	return;
	96
	97	if (dev_get_drvdata(v4l2_dev->dev) == v4l2_dev)
ae6cfaac	98	dev_set_drvdata(v4l2_dev->dev, NULL);
236c5441	99	put_device(v4l2_dev->dev);
95db3a60	100	v4l2_dev->dev = NULL;
ae6cfaac HV	101	}
	102	EXPORT_SYMBOL_GPL(v4l2_device_disconnect);
	103
2a1fcdf0 HV	104	void v4l2_device_unregister(struct v4l2_device *v4l2_dev)
	105	{
	106	struct v4l2_subdev sd, next;
	107
9e882e3b HV	108	/* Just return if v4l2_dev is NULL or if it was already
	109	* unregistered before. */
	110	if (v4l2_dev == NULL \|\| !v4l2_dev->name[0])
2a1fcdf0	111	return;
ae6cfaac HV	112	v4l2_device_disconnect(v4l2_dev);
ae6cfaac HV	113
3a63e449	114	/* Unregister subdevs */
b5b2b7ed	115	list_for_each_entry_safe(sd, next, &v4l2_dev->subdevs, list) {
2a1fcdf0	116	v4l2_device_unregister_subdev(sd);
7b34be71	117	#if IS_ENABLED(CONFIG_I2C)
b5b2b7ed HV	118	if (sd->flags & V4L2_SUBDEV_FL_IS_I2C) {
	119	struct i2c_client *client = v4l2_get_subdevdata(sd);
	120
0d51ebd3 TF	121	/*
	122	* We need to unregister the i2c client
	123	* explicitly. We cannot rely on
	124	* i2c_del_adapter to always unregister
	125	* clients for us, since if the i2c bus is a
	126	* platform bus, then it is never deleted.
	127	*
	128	* Device tree or ACPI based devices must not
	129	* be unregistered as they have not been
	130	* registered by us, and would not be
	131	* re-created by just probing the V4L2 driver.
	132	*/
	133	if (client &&
	134	!client->dev.of_node && !client->dev.fwnode)
b5b2b7ed	135	i2c_unregister_device(client);
672dcd54	136	continue;
b5b2b7ed	137	}
85e09219 DB	138	#endif
	139	#if defined(CONFIG_SPI)
	140	if (sd->flags & V4L2_SUBDEV_FL_IS_SPI) {
	141	struct spi_device *spi = v4l2_get_subdevdata(sd);
	142
0d51ebd3	143	if (spi && !spi->dev.of_node && !spi->dev.fwnode)
85e09219	144	spi_unregister_device(spi);
672dcd54	145	continue;
85e09219	146	}
b7fd6067	147	#endif
b5b2b7ed	148	}
9e882e3b HV	149	/* Mark as unregistered, thus preventing duplicate unregistrations */
9e882e3b HV	150	v4l2_dev->name[0] = '\0';
2a1fcdf0 HV	151	}
	152	EXPORT_SYMBOL_GPL(v4l2_device_unregister);
	153
3a63e449	154	int v4l2_device_register_subdev(struct v4l2_device *v4l2_dev,
61f5db54	155	struct v4l2_subdev *sd)
2a1fcdf0	156	{
61f5db54 LP	157	#if defined(CONFIG_MEDIA_CONTROLLER)
	158	struct media_entity *entity = &sd->entity;
	159	#endif
11bbc1ca HV	160	int err;
11bbc1ca HV	161
2a1fcdf0	162	/* Check for valid input */
3a63e449	163	if (v4l2_dev == NULL \|\| sd == NULL \|\| !sd->name[0])
2a1fcdf0	164	return -EINVAL;
2096a5dc	165
2a1fcdf0	166	/* Warn if we apparently re-register a subdev */
b0167600	167	WARN_ON(sd->v4l2_dev != NULL);
2096a5dc	168
b2a06aec SA	169	/*
	170	* The reason to acquire the module here is to avoid unloading
	171	* a module of sub-device which is registered to a media
	172	* device. To make it possible to unload modules for media
	173	* devices that also register sub-devices, do not
	174	* try_module_get() such sub-device owners.
	175	*/
	176	sd->owner_v4l2_dev = v4l2_dev->dev && v4l2_dev->dev->driver &&
	177	sd->owner == v4l2_dev->dev->driver->owner;
	178
	179	if (!sd->owner_v4l2_dev && !try_module_get(sd->owner))
2a1fcdf0	180	return -ENODEV;
2096a5dc	181
45f6f84a	182	sd->v4l2_dev = v4l2_dev;
11bbc1ca	183	/* This just returns 0 if either of the two args is NULL */
34a6b7d0	184	err = v4l2_ctrl_add_handler(v4l2_dev->ctrl_handler, sd->ctrl_handler, NULL);
317efce9	185	if (err)
bdf5c198	186	goto error_module;
2096a5dc	187
61f5db54 LP	188	#if defined(CONFIG_MEDIA_CONTROLLER)
	189	/* Register the entity. */
	190	if (v4l2_dev->mdev) {
	191	err = media_device_register_entity(v4l2_dev->mdev, entity);
317efce9	192	if (err < 0)
bdf5c198	193	goto error_module;
61f5db54 LP	194	}
	195	#endif
	196
bdf5c198 SA	197	if (sd->internal_ops && sd->internal_ops->registered) {
	198	err = sd->internal_ops->registered(sd);
	199	if (err)
	200	goto error_unregister;
	201	}
	202
3a63e449 HV	203	spin_lock(&v4l2_dev->lock);
	204	list_add_tail(&sd->list, &v4l2_dev->subdevs);
	205	spin_unlock(&v4l2_dev->lock);
2096a5dc	206
2a1fcdf0	207	return 0;
317efce9 LP	208
317efce9 LP	209	error_unregister:
bdf5c198 SA	210	#if defined(CONFIG_MEDIA_CONTROLLER)
	211	media_device_unregister_entity(entity);
	212	#endif
317efce9	213	error_module:
b2a06aec SA	214	if (!sd->owner_v4l2_dev)
b2a06aec SA	215	module_put(sd->owner);
317efce9 LP	216	sd->v4l2_dev = NULL;
317efce9 LP	217	return err;
2a1fcdf0 HV	218	}
	219	EXPORT_SYMBOL_GPL(v4l2_device_register_subdev);
	220
3e0ec41c GL	221	static void v4l2_device_release_subdev_node(struct video_device *vdev)
	222	{
	223	struct v4l2_subdev *sd = video_get_drvdata(vdev);
	224	sd->devnode = NULL;
	225	kfree(vdev);
	226	}
	227
2096a5dc LP	228	int v4l2_device_register_subdev_nodes(struct v4l2_device *v4l2_dev)
	229	{
	230	struct video_device *vdev;
	231	struct v4l2_subdev *sd;
	232	int err;
	233
	234	/* Register a device node for every subdev marked with the
	235	* V4L2_SUBDEV_FL_HAS_DEVNODE flag.
	236	*/
	237	list_for_each_entry(sd, &v4l2_dev->subdevs, list) {
	238	if (!(sd->flags & V4L2_SUBDEV_FL_HAS_DEVNODE))
	239	continue;
	240
3e0ec41c GL	241	vdev = kzalloc(sizeof(*vdev), GFP_KERNEL);
	242	if (!vdev) {
	243	err = -ENOMEM;
	244	goto clean_up;
	245	}
	246
	247	video_set_drvdata(vdev, sd);
2096a5dc LP	248	strlcpy(vdev->name, sd->name, sizeof(vdev->name));
	249	vdev->v4l2_dev = v4l2_dev;
	250	vdev->fops = &v4l2_subdev_fops;
3e0ec41c	251	vdev->release = v4l2_device_release_subdev_node;
18d171ba	252	vdev->ctrl_handler = sd->ctrl_handler;
2096a5dc LP	253	err = __video_register_device(vdev, VFL_TYPE_SUBDEV, -1, 1,
2096a5dc LP	254	sd->owner);
3e0ec41c GL	255	if (err < 0) {
	256	kfree(vdev);
	257	goto clean_up;
	258	}
61f5db54	259	#if defined(CONFIG_MEDIA_CONTROLLER)
e31a0ba7 MCC	260	sd->entity.info.dev.major = VIDEO_MAJOR;
e31a0ba7 MCC	261	sd->entity.info.dev.minor = vdev->minor;
d9c21e3e MCC	262
	263	/* Interface is created by __video_register_device() */
	264	if (vdev->v4l2_dev->mdev) {
	265	struct media_link *link;
	266
	267	link = media_create_intf_link(&sd->entity,
	268	&vdev->intf_devnode->intf,
13f6e888	269	MEDIA_LNK_FL_ENABLED);
1630b832 DC	270	if (!link) {
1630b832 DC	271	err = -ENOMEM;
d9c21e3e	272	goto clean_up;
1630b832	273	}
d9c21e3e	274	}
61f5db54	275	#endif
3e0ec41c	276	sd->devnode = vdev;
2096a5dc	277	}
2096a5dc	278	return 0;
3e0ec41c GL	279
	280	clean_up:
	281	list_for_each_entry(sd, &v4l2_dev->subdevs, list) {
	282	if (!sd->devnode)
	283	break;
	284	video_unregister_device(sd->devnode);
	285	}
	286
	287	return err;
2096a5dc LP	288	}
	289	EXPORT_SYMBOL_GPL(v4l2_device_register_subdev_nodes);
	290
2a1fcdf0 HV	291	void v4l2_device_unregister_subdev(struct v4l2_subdev *sd)
2a1fcdf0 HV	292	{
61f5db54 LP	293	struct v4l2_device *v4l2_dev;
61f5db54 LP	294
2a1fcdf0	295	/* return if it isn't registered */
b0167600	296	if (sd == NULL \|\| sd->v4l2_dev == NULL)
2a1fcdf0	297	return;
2096a5dc	298
61f5db54 LP	299	v4l2_dev = sd->v4l2_dev;
	300
	301	spin_lock(&v4l2_dev->lock);
2a1fcdf0	302	list_del(&sd->list);
61f5db54 LP	303	spin_unlock(&v4l2_dev->lock);
61f5db54 LP	304
45f6f84a HV	305	if (sd->internal_ops && sd->internal_ops->unregistered)
45f6f84a HV	306	sd->internal_ops->unregistered(sd);
b0167600	307	sd->v4l2_dev = NULL;
2096a5dc	308
61f5db54	309	#if defined(CONFIG_MEDIA_CONTROLLER)
c2efd3e6	310	if (v4l2_dev->mdev) {
d9c21e3e MCC	311	/*
	312	* No need to explicitly remove links, as both pads and
	313	* links are removed by the function below, in the right order
	314	*/
61f5db54	315	media_device_unregister_entity(&sd->entity);
c2efd3e6	316	}
61f5db54	317	#endif
3e0ec41c	318	video_unregister_device(sd->devnode);
b2a06aec SA	319	if (!sd->owner_v4l2_dev)
b2a06aec SA	320	module_put(sd->owner);
2a1fcdf0 HV	321	}
2a1fcdf0 HV	322	EXPORT_SYMBOL_GPL(v4l2_device_unregister_subdev);