[mirror_ubuntu-jammy-kernel.git] / drivers / media / v4l2-core / v4l2-device.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
    V4L2 device support.

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

 */

#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 || !sd || sd->v4l2_dev || !sd->name[0])
		return -EINVAL;

	/*
	 * 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, true);
	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_subdev_release(struct v4l2_subdev *sd)
{
	struct module *owner = !sd->owner_v4l2_dev ? sd->owner : NULL;

	if (sd->internal_ops && sd->internal_ops->release)
		sd->internal_ops->release(sd);
	module_put(owner);
}

static void v4l2_device_release_subdev_node(struct video_device *vdev)
{
	v4l2_subdev_release(video_get_drvdata(vdev));
	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;

		if (sd->devnode)
			continue;

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

		video_set_drvdata(vdev, sd);
		strscpy(vdev->name, sd->name, sizeof(vdev->name));
		vdev->dev_parent = sd->dev;
		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;
		}
		sd->devnode = vdev;
#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 |
						      MEDIA_LNK_FL_IMMUTABLE);
			if (!link) {
				err = -ENOMEM;
				goto clean_up;
			}
		}
#endif
	}
	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
	if (sd->devnode)
		video_unregister_device(sd->devnode);
	else
		v4l2_subdev_release(sd);
}
EXPORT_SYMBOL_GPL(v4l2_device_unregister_subdev);
Commit	Line	Data
1a59d1b8	1	// SPDX-License-Identifier: GPL-2.0-or-later
2a1fcdf0 HV	2	/*
	3	V4L2 device support.
	4
	5	Copyright (C) 2008 Hans Verkuil <hverkuil@xs4all.nl>
	6
2a1fcdf0 HV	7	*/
	8
	9	#include <linux/types.h>
	10	#include <linux/ioctl.h>
7a707b89	11	#include <linux/module.h>
2a1fcdf0	12	#include <linux/i2c.h>
3e0ec41c	13	#include <linux/slab.h>
85e09219 DB	14	#if defined(CONFIG_SPI)
	15	#include <linux/spi/spi.h>
	16	#endif
2a1fcdf0 HV	17	#include <linux/videodev2.h>
2a1fcdf0 HV	18	#include <media/v4l2-device.h>
11bbc1ca	19	#include <media/v4l2-ctrls.h>
2a1fcdf0 HV	20
	21	int v4l2_device_register(struct device dev, struct v4l2_device v4l2_dev)
	22	{
3a63e449	23	if (v4l2_dev == NULL)
2a1fcdf0	24	return -EINVAL;
3a63e449	25
2a1fcdf0 HV	26	INIT_LIST_HEAD(&v4l2_dev->subdevs);
2a1fcdf0 HV	27	spin_lock_init(&v4l2_dev->lock);
0f62fd6a	28	v4l2_prio_init(&v4l2_dev->prio);
bedf8bcf	29	kref_init(&v4l2_dev->ref);
236c5441	30	get_device(dev);
2a1fcdf0	31	v4l2_dev->dev = dev;
3a63e449 HV	32	if (dev == NULL) {
3a63e449 HV	33	/* If dev == NULL, then name must be filled in by the caller */
9e882e3b HV	34	if (WARN_ON(!v4l2_dev->name[0]))
9e882e3b HV	35	return -EINVAL;
3a63e449 HV	36	return 0;
	37	}
	38
	39	/* Set name to driver name + device name if it is empty. */
	40	if (!v4l2_dev->name[0])
	41	snprintf(v4l2_dev->name, sizeof(v4l2_dev->name), "%s %s",
c3ef01ce	42	dev->driver->name, dev_name(dev));
95db3a60 LP	43	if (!dev_get_drvdata(dev))
95db3a60 LP	44	dev_set_drvdata(dev, v4l2_dev);
2a1fcdf0 HV	45	return 0;
	46	}
	47	EXPORT_SYMBOL_GPL(v4l2_device_register);
	48
bedf8bcf HV	49	static void v4l2_device_release(struct kref *ref)
	50	{
	51	struct v4l2_device *v4l2_dev =
	52	container_of(ref, struct v4l2_device, ref);
	53
	54	if (v4l2_dev->release)
	55	v4l2_dev->release(v4l2_dev);
	56	}
	57
	58	int v4l2_device_put(struct v4l2_device *v4l2_dev)
	59	{
	60	return kref_put(&v4l2_dev->ref, v4l2_device_release);
	61	}
	62	EXPORT_SYMBOL_GPL(v4l2_device_put);
	63
102e7813 HV	64	int v4l2_device_set_name(struct v4l2_device v4l2_dev, const char basename,
	65	atomic_t *instance)
	66	{
	67	int num = atomic_inc_return(instance) - 1;
	68	int len = strlen(basename);
	69
	70	if (basename[len - 1] >= '0' && basename[len - 1] <= '9')
	71	snprintf(v4l2_dev->name, sizeof(v4l2_dev->name),
	72	"%s-%d", basename, num);
	73	else
	74	snprintf(v4l2_dev->name, sizeof(v4l2_dev->name),
	75	"%s%d", basename, num);
	76	return num;
	77	}
	78	EXPORT_SYMBOL_GPL(v4l2_device_set_name);
	79
ae6cfaac HV	80	void v4l2_device_disconnect(struct v4l2_device *v4l2_dev)
ae6cfaac HV	81	{
95db3a60 LP	82	if (v4l2_dev->dev == NULL)
	83	return;
	84
	85	if (dev_get_drvdata(v4l2_dev->dev) == v4l2_dev)
ae6cfaac	86	dev_set_drvdata(v4l2_dev->dev, NULL);
236c5441	87	put_device(v4l2_dev->dev);
95db3a60	88	v4l2_dev->dev = NULL;
ae6cfaac HV	89	}
	90	EXPORT_SYMBOL_GPL(v4l2_device_disconnect);
	91
2a1fcdf0 HV	92	void v4l2_device_unregister(struct v4l2_device *v4l2_dev)
	93	{
	94	struct v4l2_subdev sd, next;
	95
9e882e3b HV	96	/* Just return if v4l2_dev is NULL or if it was already
	97	* unregistered before. */
	98	if (v4l2_dev == NULL \|\| !v4l2_dev->name[0])
2a1fcdf0	99	return;
ae6cfaac HV	100	v4l2_device_disconnect(v4l2_dev);
ae6cfaac HV	101
3a63e449	102	/* Unregister subdevs */
b5b2b7ed	103	list_for_each_entry_safe(sd, next, &v4l2_dev->subdevs, list) {
2a1fcdf0	104	v4l2_device_unregister_subdev(sd);
7b34be71	105	#if IS_ENABLED(CONFIG_I2C)
b5b2b7ed HV	106	if (sd->flags & V4L2_SUBDEV_FL_IS_I2C) {
	107	struct i2c_client *client = v4l2_get_subdevdata(sd);
	108
0d51ebd3 TF	109	/*
	110	* We need to unregister the i2c client
	111	* explicitly. We cannot rely on
	112	* i2c_del_adapter to always unregister
	113	* clients for us, since if the i2c bus is a
	114	* platform bus, then it is never deleted.
	115	*
	116	* Device tree or ACPI based devices must not
	117	* be unregistered as they have not been
	118	* registered by us, and would not be
	119	* re-created by just probing the V4L2 driver.
	120	*/
	121	if (client &&
	122	!client->dev.of_node && !client->dev.fwnode)
b5b2b7ed	123	i2c_unregister_device(client);
672dcd54	124	continue;
b5b2b7ed	125	}
85e09219 DB	126	#endif
	127	#if defined(CONFIG_SPI)
	128	if (sd->flags & V4L2_SUBDEV_FL_IS_SPI) {
	129	struct spi_device *spi = v4l2_get_subdevdata(sd);
	130
0d51ebd3	131	if (spi && !spi->dev.of_node && !spi->dev.fwnode)
85e09219	132	spi_unregister_device(spi);
672dcd54	133	continue;
85e09219	134	}
b7fd6067	135	#endif
b5b2b7ed	136	}
9e882e3b HV	137	/* Mark as unregistered, thus preventing duplicate unregistrations */
9e882e3b HV	138	v4l2_dev->name[0] = '\0';
2a1fcdf0 HV	139	}
	140	EXPORT_SYMBOL_GPL(v4l2_device_unregister);
	141
3a63e449	142	int v4l2_device_register_subdev(struct v4l2_device *v4l2_dev,
61f5db54	143	struct v4l2_subdev *sd)
2a1fcdf0	144	{
61f5db54 LP	145	#if defined(CONFIG_MEDIA_CONTROLLER)
	146	struct media_entity *entity = &sd->entity;
	147	#endif
11bbc1ca HV	148	int err;
11bbc1ca HV	149
2a1fcdf0	150	/* Check for valid input */
fc490717	151	if (!v4l2_dev \|\| !sd \|\| sd->v4l2_dev \|\| !sd->name[0])
2a1fcdf0	152	return -EINVAL;
2096a5dc	153
b2a06aec SA	154	/*
	155	* The reason to acquire the module here is to avoid unloading
	156	* a module of sub-device which is registered to a media
	157	* device. To make it possible to unload modules for media
	158	* devices that also register sub-devices, do not
	159	* try_module_get() such sub-device owners.
	160	*/
	161	sd->owner_v4l2_dev = v4l2_dev->dev && v4l2_dev->dev->driver &&
	162	sd->owner == v4l2_dev->dev->driver->owner;
	163
	164	if (!sd->owner_v4l2_dev && !try_module_get(sd->owner))
2a1fcdf0	165	return -ENODEV;
2096a5dc	166
45f6f84a	167	sd->v4l2_dev = v4l2_dev;
11bbc1ca	168	/* This just returns 0 if either of the two args is NULL */
da1b1aea HV	169	err = v4l2_ctrl_add_handler(v4l2_dev->ctrl_handler, sd->ctrl_handler,
da1b1aea HV	170	NULL, true);
317efce9	171	if (err)
bdf5c198	172	goto error_module;
2096a5dc	173
61f5db54 LP	174	#if defined(CONFIG_MEDIA_CONTROLLER)
	175	/* Register the entity. */
	176	if (v4l2_dev->mdev) {
	177	err = media_device_register_entity(v4l2_dev->mdev, entity);
317efce9	178	if (err < 0)
bdf5c198	179	goto error_module;
61f5db54 LP	180	}
	181	#endif
	182
bdf5c198 SA	183	if (sd->internal_ops && sd->internal_ops->registered) {
	184	err = sd->internal_ops->registered(sd);
	185	if (err)
	186	goto error_unregister;
	187	}
	188
3a63e449 HV	189	spin_lock(&v4l2_dev->lock);
	190	list_add_tail(&sd->list, &v4l2_dev->subdevs);
	191	spin_unlock(&v4l2_dev->lock);
2096a5dc	192
2a1fcdf0	193	return 0;
317efce9 LP	194
317efce9 LP	195	error_unregister:
bdf5c198 SA	196	#if defined(CONFIG_MEDIA_CONTROLLER)
	197	media_device_unregister_entity(entity);
	198	#endif
317efce9	199	error_module:
b2a06aec SA	200	if (!sd->owner_v4l2_dev)
b2a06aec SA	201	module_put(sd->owner);
317efce9 LP	202	sd->v4l2_dev = NULL;
317efce9 LP	203	return err;
2a1fcdf0 HV	204	}
	205	EXPORT_SYMBOL_GPL(v4l2_device_register_subdev);
	206
0e43734d HV	207	static void v4l2_subdev_release(struct v4l2_subdev *sd)
	208	{
	209	struct module *owner = !sd->owner_v4l2_dev ? sd->owner : NULL;
	210
	211	if (sd->internal_ops && sd->internal_ops->release)
	212	sd->internal_ops->release(sd);
	213	module_put(owner);
	214	}
	215
3e0ec41c GL	216	static void v4l2_device_release_subdev_node(struct video_device *vdev)
3e0ec41c GL	217	{
0e43734d	218	v4l2_subdev_release(video_get_drvdata(vdev));
3e0ec41c GL	219	kfree(vdev);
	220	}
	221
2096a5dc LP	222	int v4l2_device_register_subdev_nodes(struct v4l2_device *v4l2_dev)
	223	{
	224	struct video_device *vdev;
	225	struct v4l2_subdev *sd;
	226	int err;
	227
	228	/* Register a device node for every subdev marked with the
	229	* V4L2_SUBDEV_FL_HAS_DEVNODE flag.
	230	*/
	231	list_for_each_entry(sd, &v4l2_dev->subdevs, list) {
	232	if (!(sd->flags & V4L2_SUBDEV_FL_HAS_DEVNODE))
	233	continue;
	234
db0f4691 SR	235	if (sd->devnode)
	236	continue;
	237
3e0ec41c GL	238	vdev = kzalloc(sizeof(*vdev), GFP_KERNEL);
	239	if (!vdev) {
	240	err = -ENOMEM;
	241	goto clean_up;
	242	}
	243
	244	video_set_drvdata(vdev, sd);
c0decac1	245	strscpy(vdev->name, sd->name, sizeof(vdev->name));
ee494cf3	246	vdev->dev_parent = sd->dev;
2096a5dc LP	247	vdev->v4l2_dev = v4l2_dev;
2096a5dc LP	248	vdev->fops = &v4l2_subdev_fops;
3e0ec41c	249	vdev->release = v4l2_device_release_subdev_node;
18d171ba	250	vdev->ctrl_handler = sd->ctrl_handler;
2096a5dc LP	251	err = __video_register_device(vdev, VFL_TYPE_SUBDEV, -1, 1,
2096a5dc LP	252	sd->owner);
3e0ec41c GL	253	if (err < 0) {
	254	kfree(vdev);
	255	goto clean_up;
	256	}
909aa003	257	sd->devnode = vdev;
61f5db54	258	#if defined(CONFIG_MEDIA_CONTROLLER)
e31a0ba7 MCC	259	sd->entity.info.dev.major = VIDEO_MAJOR;
e31a0ba7 MCC	260	sd->entity.info.dev.minor = vdev->minor;
d9c21e3e MCC	261
	262	/* Interface is created by __video_register_device() */
	263	if (vdev->v4l2_dev->mdev) {
	264	struct media_link *link;
	265
	266	link = media_create_intf_link(&sd->entity,
	267	&vdev->intf_devnode->intf,
4d1e4545 HV	268	MEDIA_LNK_FL_ENABLED \|
4d1e4545 HV	269	MEDIA_LNK_FL_IMMUTABLE);
1630b832 DC	270	if (!link) {
1630b832 DC	271	err = -ENOMEM;
d9c21e3e	272	goto clean_up;
1630b832	273	}
d9c21e3e	274	}
61f5db54	275	#endif
2096a5dc	276	}
2096a5dc	277	return 0;
3e0ec41c GL	278
	279	clean_up:
	280	list_for_each_entry(sd, &v4l2_dev->subdevs, list) {
	281	if (!sd->devnode)
	282	break;
	283	video_unregister_device(sd->devnode);
	284	}
	285
	286	return err;
2096a5dc LP	287	}
	288	EXPORT_SYMBOL_GPL(v4l2_device_register_subdev_nodes);
	289
2a1fcdf0 HV	290	void v4l2_device_unregister_subdev(struct v4l2_subdev *sd)
2a1fcdf0 HV	291	{
61f5db54 LP	292	struct v4l2_device *v4l2_dev;
61f5db54 LP	293
2a1fcdf0	294	/* return if it isn't registered */
b0167600	295	if (sd == NULL \|\| sd->v4l2_dev == NULL)
2a1fcdf0	296	return;
2096a5dc	297
61f5db54 LP	298	v4l2_dev = sd->v4l2_dev;
	299
	300	spin_lock(&v4l2_dev->lock);
2a1fcdf0	301	list_del(&sd->list);
61f5db54 LP	302	spin_unlock(&v4l2_dev->lock);
61f5db54 LP	303
45f6f84a HV	304	if (sd->internal_ops && sd->internal_ops->unregistered)
45f6f84a HV	305	sd->internal_ops->unregistered(sd);
b0167600	306	sd->v4l2_dev = NULL;
2096a5dc	307
61f5db54	308	#if defined(CONFIG_MEDIA_CONTROLLER)
c2efd3e6	309	if (v4l2_dev->mdev) {
d9c21e3e MCC	310	/*
	311	* No need to explicitly remove links, as both pads and
	312	* links are removed by the function below, in the right order
	313	*/
61f5db54	314	media_device_unregister_entity(&sd->entity);
c2efd3e6	315	}
61f5db54	316	#endif
0e43734d HV	317	if (sd->devnode)
	318	video_unregister_device(sd->devnode);
	319	else
	320	v4l2_subdev_release(sd);
2a1fcdf0 HV	321	}
2a1fcdf0 HV	322	EXPORT_SYMBOL_GPL(v4l2_device_unregister_subdev);