media: move drivers/media/media-* to drivers/media/mc/mc-*

It is really weird that the media controller sources are all top-level
in drivers/media. It is a bit of a left-over from long ago when most
media sources were all at the top-level. At some point we reorganized
the directory structure, but the media-*.c sources where never moved
to their own directory.

So create a new mc directory and move all sources there. Also rename
the prefix from media- to mc-.

Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

1 files changed, 0 insertions, 909 deletions

diff --git a/drivers/media/media-device.c b/drivers/media/media-device.c
deleted file mode 100644
index 6893843edada..000000000000
--- a/drivers/media/media-device.c
+++ /dev/null
@@ -1,909 +0,0 @@
-/*
- * Media device
- *
- * Copyright (C) 2010 Nokia Corporation
- *
- * Contacts: 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.
- */
-
-#include <linux/compat.h>
-#include <linux/export.h>
-#include <linux/idr.h>
-#include <linux/ioctl.h>
-#include <linux/media.h>
-#include <linux/slab.h>
-#include <linux/types.h>
-#include <linux/pci.h>
-#include <linux/usb.h>
-#include <linux/version.h>
-
-#include <media/media-device.h>
-#include <media/media-devnode.h>
-#include <media/media-entity.h>
-#include <media/media-request.h>
-
-#ifdef CONFIG_MEDIA_CONTROLLER
-
-/*
- * Legacy defines from linux/media.h. This is the only place we need this
- * so we just define it here. The media.h header doesn't expose it to the
- * kernel to prevent it from being used by drivers, but here (and only here!)
- * we need it to handle the legacy behavior.
- */
-#define MEDIA_ENT_SUBTYPE_MASK			0x0000ffff
-#define MEDIA_ENT_T_DEVNODE_UNKNOWN		(MEDIA_ENT_F_OLD_BASE | \
-						 MEDIA_ENT_SUBTYPE_MASK)
-
-/* -----------------------------------------------------------------------------
- * Userspace API
- */
-
-static inline void __user *media_get_uptr(__u64 arg)
-{
-	return (void __user *)(uintptr_t)arg;
-}
-
-static int media_device_open(struct file *filp)
-{
-	return 0;
-}
-
-static int media_device_close(struct file *filp)
-{
-	return 0;
-}
-
-static long media_device_get_info(struct media_device *dev, void *arg)
-{
-	struct media_device_info *info = arg;
-
-	memset(info, 0, sizeof(*info));
-
-	if (dev->driver_name[0])
-		strscpy(info->driver, dev->driver_name, sizeof(info->driver));
-	else
-		strscpy(info->driver, dev->dev->driver->name,
-			sizeof(info->driver));
-
-	strscpy(info->model, dev->model, sizeof(info->model));
-	strscpy(info->serial, dev->serial, sizeof(info->serial));
-	strscpy(info->bus_info, dev->bus_info, sizeof(info->bus_info));
-
-	info->media_version = LINUX_VERSION_CODE;
-	info->driver_version = info->media_version;
-	info->hw_revision = dev->hw_revision;
-
-	return 0;
-}
-
-static struct media_entity *find_entity(struct media_device *mdev, u32 id)
-{
-	struct media_entity *entity;
-	int next = id & MEDIA_ENT_ID_FLAG_NEXT;
-
-	id &= ~MEDIA_ENT_ID_FLAG_NEXT;
-
-	media_device_for_each_entity(entity, mdev) {
-		if (((media_entity_id(entity) == id) && !next) ||
-		    ((media_entity_id(entity) > id) && next)) {
-			return entity;
-		}
-	}
-
-	return NULL;
-}
-
-static long media_device_enum_entities(struct media_device *mdev, void *arg)
-{
-	struct media_entity_desc *entd = arg;
-	struct media_entity *ent;
-
-	ent = find_entity(mdev, entd->id);
-	if (ent == NULL)
-		return -EINVAL;
-
-	memset(entd, 0, sizeof(*entd));
-
-	entd->id = media_entity_id(ent);
-	if (ent->name)
-		strscpy(entd->name, ent->name, sizeof(entd->name));
-	entd->type = ent->function;
-	entd->revision = 0;		/* Unused */
-	entd->flags = ent->flags;
-	entd->group_id = 0;		/* Unused */
-	entd->pads = ent->num_pads;
-	entd->links = ent->num_links - ent->num_backlinks;
-
-	/*
-	 * Workaround for a bug at media-ctl <= v1.10 that makes it to
-	 * do the wrong thing if the entity function doesn't belong to
-	 * either MEDIA_ENT_F_OLD_BASE or MEDIA_ENT_F_OLD_SUBDEV_BASE
-	 * Ranges.
-	 *
-	 * Non-subdevices are expected to be at the MEDIA_ENT_F_OLD_BASE,
-	 * or, otherwise, will be silently ignored by media-ctl when
-	 * printing the graphviz diagram. So, map them into the devnode
-	 * old range.
-	 */
-	if (ent->function < MEDIA_ENT_F_OLD_BASE ||
-	    ent->function > MEDIA_ENT_F_TUNER) {
-		if (is_media_entity_v4l2_subdev(ent))
-			entd->type = MEDIA_ENT_F_V4L2_SUBDEV_UNKNOWN;
-		else if (ent->function != MEDIA_ENT_F_IO_V4L)
-			entd->type = MEDIA_ENT_T_DEVNODE_UNKNOWN;
-	}
-
-	memcpy(&entd->raw, &ent->info, sizeof(ent->info));
-
-	return 0;
-}
-
-static void media_device_kpad_to_upad(const struct media_pad *kpad,
-				      struct media_pad_desc *upad)
-{
-	upad->entity = media_entity_id(kpad->entity);
-	upad->index = kpad->index;
-	upad->flags = kpad->flags;
-}
-
-static long media_device_enum_links(struct media_device *mdev, void *arg)
-{
-	struct media_links_enum *links = arg;
-	struct media_entity *entity;
-
-	entity = find_entity(mdev, links->entity);
-	if (entity == NULL)
-		return -EINVAL;
-
-	if (links->pads) {
-		unsigned int p;
-
-		for (p = 0; p < entity->num_pads; p++) {
-			struct media_pad_desc pad;
-
-			memset(&pad, 0, sizeof(pad));
-			media_device_kpad_to_upad(&entity->pads[p], &pad);
-			if (copy_to_user(&links->pads[p], &pad, sizeof(pad)))
-				return -EFAULT;
-		}
-	}
-
-	if (links->links) {
-		struct media_link *link;
-		struct media_link_desc __user *ulink_desc = links->links;
-
-		list_for_each_entry(link, &entity->links, list) {
-			struct media_link_desc klink_desc;
-
-			/* Ignore backlinks. */
-			if (link->source->entity != entity)
-				continue;
-			memset(&klink_desc, 0, sizeof(klink_desc));
-			media_device_kpad_to_upad(link->source,
-						  &klink_desc.source);
-			media_device_kpad_to_upad(link->sink,
-						  &klink_desc.sink);
-			klink_desc.flags = link->flags;
-			if (copy_to_user(ulink_desc, &klink_desc,
-					 sizeof(*ulink_desc)))
-				return -EFAULT;
-			ulink_desc++;
-		}
-	}
-	memset(links->reserved, 0, sizeof(links->reserved));
-
-	return 0;
-}
-
-static long media_device_setup_link(struct media_device *mdev, void *arg)
-{
-	struct media_link_desc *linkd = arg;
-	struct media_link *link = NULL;
-	struct media_entity *source;
-	struct media_entity *sink;
-
-	/* Find the source and sink entities and link.
-	 */
-	source = find_entity(mdev, linkd->source.entity);
-	sink = find_entity(mdev, linkd->sink.entity);
-
-	if (source == NULL || sink == NULL)
-		return -EINVAL;
-
-	if (linkd->source.index >= source->num_pads ||
-	    linkd->sink.index >= sink->num_pads)
-		return -EINVAL;
-
-	link = media_entity_find_link(&source->pads[linkd->source.index],
-				      &sink->pads[linkd->sink.index]);
-	if (link == NULL)
-		return -EINVAL;
-
-	memset(linkd->reserved, 0, sizeof(linkd->reserved));
-
-	/* Setup the link on both entities. */
-	return __media_entity_setup_link(link, linkd->flags);
-}
-
-static long media_device_get_topology(struct media_device *mdev, void *arg)
-{
-	struct media_v2_topology *topo = arg;
-	struct media_entity *entity;
-	struct media_interface *intf;
-	struct media_pad *pad;
-	struct media_link *link;
-	struct media_v2_entity kentity, __user *uentity;
-	struct media_v2_interface kintf, __user *uintf;
-	struct media_v2_pad kpad, __user *upad;
-	struct media_v2_link klink, __user *ulink;
-	unsigned int i;
-	int ret = 0;
-
-	topo->topology_version = mdev->topology_version;
-
-	/* Get entities and number of entities */
-	i = 0;
-	uentity = media_get_uptr(topo->ptr_entities);
-	media_device_for_each_entity(entity, mdev) {
-		i++;
-		if (ret || !uentity)
-			continue;
-
-		if (i > topo->num_entities) {
-			ret = -ENOSPC;
-			continue;
-		}
-
-		/* Copy fields to userspace struct if not error */
-		memset(&kentity, 0, sizeof(kentity));
-		kentity.id = entity->graph_obj.id;
-		kentity.function = entity->function;
-		kentity.flags = entity->flags;
-		strscpy(kentity.name, entity->name,
-			sizeof(kentity.name));
-
-		if (copy_to_user(uentity, &kentity, sizeof(kentity)))
-			ret = -EFAULT;
-		uentity++;
-	}
-	topo->num_entities = i;
-	topo->reserved1 = 0;
-
-	/* Get interfaces and number of interfaces */
-	i = 0;
-	uintf = media_get_uptr(topo->ptr_interfaces);
-	media_device_for_each_intf(intf, mdev) {
-		i++;
-		if (ret || !uintf)
-			continue;
-
-		if (i > topo->num_interfaces) {
-			ret = -ENOSPC;
-			continue;
-		}
-
-		memset(&kintf, 0, sizeof(kintf));
-
-		/* Copy intf fields to userspace struct */
-		kintf.id = intf->graph_obj.id;
-		kintf.intf_type = intf->type;
-		kintf.flags = intf->flags;
-
-		if (media_type(&intf->graph_obj) == MEDIA_GRAPH_INTF_DEVNODE) {
-			struct media_intf_devnode *devnode;
-
-			devnode = intf_to_devnode(intf);
-
-			kintf.devnode.major = devnode->major;
-			kintf.devnode.minor = devnode->minor;
-		}
-
-		if (copy_to_user(uintf, &kintf, sizeof(kintf)))
-			ret = -EFAULT;
-		uintf++;
-	}
-	topo->num_interfaces = i;
-	topo->reserved2 = 0;
-
-	/* Get pads and number of pads */
-	i = 0;
-	upad = media_get_uptr(topo->ptr_pads);
-	media_device_for_each_pad(pad, mdev) {
-		i++;
-		if (ret || !upad)
-			continue;
-
-		if (i > topo->num_pads) {
-			ret = -ENOSPC;
-			continue;
-		}
-
-		memset(&kpad, 0, sizeof(kpad));
-
-		/* Copy pad fields to userspace struct */
-		kpad.id = pad->graph_obj.id;
-		kpad.entity_id = pad->entity->graph_obj.id;
-		kpad.flags = pad->flags;
-		kpad.index = pad->index;
-
-		if (copy_to_user(upad, &kpad, sizeof(kpad)))
-			ret = -EFAULT;
-		upad++;
-	}
-	topo->num_pads = i;
-	topo->reserved3 = 0;
-
-	/* Get links and number of links */
-	i = 0;
-	ulink = media_get_uptr(topo->ptr_links);
-	media_device_for_each_link(link, mdev) {
-		if (link->is_backlink)
-			continue;
-
-		i++;
-
-		if (ret || !ulink)
-			continue;
-
-		if (i > topo->num_links) {
-			ret = -ENOSPC;
-			continue;
-		}
-
-		memset(&klink, 0, sizeof(klink));
-
-		/* Copy link fields to userspace struct */
-		klink.id = link->graph_obj.id;
-		klink.source_id = link->gobj0->id;
-		klink.sink_id = link->gobj1->id;
-		klink.flags = link->flags;
-
-		if (copy_to_user(ulink, &klink, sizeof(klink)))
-			ret = -EFAULT;
-		ulink++;
-	}
-	topo->num_links = i;
-	topo->reserved4 = 0;
-
-	return ret;
-}
-
-static long media_device_request_alloc(struct media_device *mdev,
-				       int *alloc_fd)
-{
-#ifdef CONFIG_MEDIA_CONTROLLER_REQUEST_API
-	if (!mdev->ops || !mdev->ops->req_validate || !mdev->ops->req_queue)
-		return -ENOTTY;
-
-	return media_request_alloc(mdev, alloc_fd);
-#else
-	return -ENOTTY;
-#endif
-}
-
-static long copy_arg_from_user(void *karg, void __user *uarg, unsigned int cmd)
-{
-	if ((_IOC_DIR(cmd) & _IOC_WRITE) &&
-	    copy_from_user(karg, uarg, _IOC_SIZE(cmd)))
-		return -EFAULT;
-
-	return 0;
-}
-
-static long copy_arg_to_user(void __user *uarg, void *karg, unsigned int cmd)
-{
-	if ((_IOC_DIR(cmd) & _IOC_READ) &&
-	    copy_to_user(uarg, karg, _IOC_SIZE(cmd)))
-		return -EFAULT;
-
-	return 0;
-}
-
-/* Do acquire the graph mutex */
-#define MEDIA_IOC_FL_GRAPH_MUTEX	BIT(0)
-
-#define MEDIA_IOC_ARG(__cmd, func, fl, from_user, to_user)		\
-	[_IOC_NR(MEDIA_IOC_##__cmd)] = {				\
-		.cmd = MEDIA_IOC_##__cmd,				\
-		.fn = (long (*)(struct media_device *, void *))func,	\
-		.flags = fl,						\
-		.arg_from_user = from_user,				\
-		.arg_to_user = to_user,					\
-	}
-
-#define MEDIA_IOC(__cmd, func, fl)					\
-	MEDIA_IOC_ARG(__cmd, func, fl, copy_arg_from_user, copy_arg_to_user)
-
-/* the table is indexed by _IOC_NR(cmd) */
-struct media_ioctl_info {
-	unsigned int cmd;
-	unsigned short flags;
-	long (*fn)(struct media_device *dev, void *arg);
-	long (*arg_from_user)(void *karg, void __user *uarg, unsigned int cmd);
-	long (*arg_to_user)(void __user *uarg, void *karg, unsigned int cmd);
-};
-
-static const struct media_ioctl_info ioctl_info[] = {
-	MEDIA_IOC(DEVICE_INFO, media_device_get_info, MEDIA_IOC_FL_GRAPH_MUTEX),
-	MEDIA_IOC(ENUM_ENTITIES, media_device_enum_entities, MEDIA_IOC_FL_GRAPH_MUTEX),
-	MEDIA_IOC(ENUM_LINKS, media_device_enum_links, MEDIA_IOC_FL_GRAPH_MUTEX),
-	MEDIA_IOC(SETUP_LINK, media_device_setup_link, MEDIA_IOC_FL_GRAPH_MUTEX),
-	MEDIA_IOC(G_TOPOLOGY, media_device_get_topology, MEDIA_IOC_FL_GRAPH_MUTEX),
-	MEDIA_IOC(REQUEST_ALLOC, media_device_request_alloc, 0),
-};
-
-static long media_device_ioctl(struct file *filp, unsigned int cmd,
-			       unsigned long __arg)
-{
-	struct media_devnode *devnode = media_devnode_data(filp);
-	struct media_device *dev = devnode->media_dev;
-	const struct media_ioctl_info *info;
-	void __user *arg = (void __user *)__arg;
-	char __karg[256], *karg = __karg;
-	long ret;
-
-	if (_IOC_NR(cmd) >= ARRAY_SIZE(ioctl_info)
-	    || ioctl_info[_IOC_NR(cmd)].cmd != cmd)
-		return -ENOIOCTLCMD;
-
-	info = &ioctl_info[_IOC_NR(cmd)];
-
-	if (_IOC_SIZE(info->cmd) > sizeof(__karg)) {
-		karg = kmalloc(_IOC_SIZE(info->cmd), GFP_KERNEL);
-		if (!karg)
-			return -ENOMEM;
-	}
-
-	if (info->arg_from_user) {
-		ret = info->arg_from_user(karg, arg, cmd);
-		if (ret)
-			goto out_free;
-	}
-
-	if (info->flags & MEDIA_IOC_FL_GRAPH_MUTEX)
-		mutex_lock(&dev->graph_mutex);
-
-	ret = info->fn(dev, karg);
-
-	if (info->flags & MEDIA_IOC_FL_GRAPH_MUTEX)
-		mutex_unlock(&dev->graph_mutex);
-
-	if (!ret && info->arg_to_user)
-		ret = info->arg_to_user(arg, karg, cmd);
-
-out_free:
-	if (karg != __karg)
-		kfree(karg);
-
-	return ret;
-}
-
-#ifdef CONFIG_COMPAT
-
-struct media_links_enum32 {
-	__u32 entity;
-	compat_uptr_t pads; /* struct media_pad_desc * */
-	compat_uptr_t links; /* struct media_link_desc * */
-	__u32 reserved[4];
-};
-
-static long media_device_enum_links32(struct media_device *mdev,
-				      struct media_links_enum32 __user *ulinks)
-{
-	struct media_links_enum links;
-	compat_uptr_t pads_ptr, links_ptr;
-	int ret;
-
-	memset(&links, 0, sizeof(links));
-
-	if (get_user(links.entity, &ulinks->entity)
-	    || get_user(pads_ptr, &ulinks->pads)
-	    || get_user(links_ptr, &ulinks->links))
-		return -EFAULT;
-
-	links.pads = compat_ptr(pads_ptr);
-	links.links = compat_ptr(links_ptr);
-
-	ret = media_device_enum_links(mdev, &links);
-	if (ret)
-		return ret;
-
-	memset(ulinks->reserved, 0, sizeof(ulinks->reserved));
-
-	return 0;
-}
-
-#define MEDIA_IOC_ENUM_LINKS32		_IOWR('|', 0x02, struct media_links_enum32)
-
-static long media_device_compat_ioctl(struct file *filp, unsigned int cmd,
-				      unsigned long arg)
-{
-	struct media_devnode *devnode = media_devnode_data(filp);
-	struct media_device *dev = devnode->media_dev;
-	long ret;
-
-	switch (cmd) {
-	case MEDIA_IOC_ENUM_LINKS32:
-		mutex_lock(&dev->graph_mutex);
-		ret = media_device_enum_links32(dev,
-				(struct media_links_enum32 __user *)arg);
-		mutex_unlock(&dev->graph_mutex);
-		break;
-
-	default:
-		return media_device_ioctl(filp, cmd, arg);
-	}
-
-	return ret;
-}
-#endif /* CONFIG_COMPAT */
-
-static const struct media_file_operations media_device_fops = {
-	.owner = THIS_MODULE,
-	.open = media_device_open,
-	.ioctl = media_device_ioctl,
-#ifdef CONFIG_COMPAT
-	.compat_ioctl = media_device_compat_ioctl,
-#endif /* CONFIG_COMPAT */
-	.release = media_device_close,
-};
-
-/* -----------------------------------------------------------------------------
- * sysfs
- */
-
-static ssize_t show_model(struct device *cd,
-			  struct device_attribute *attr, char *buf)
-{
-	struct media_devnode *devnode = to_media_devnode(cd);
-	struct media_device *mdev = devnode->media_dev;
-
-	return sprintf(buf, "%.*s\n", (int)sizeof(mdev->model), mdev->model);
-}
-
-static DEVICE_ATTR(model, S_IRUGO, show_model, NULL);
-
-/* -----------------------------------------------------------------------------
- * Registration/unregistration
- */
-
-static void media_device_release(struct media_devnode *devnode)
-{
-	dev_dbg(devnode->parent, "Media device released\n");
-}
-
-/**
- * media_device_register_entity - Register an entity with a media device
- * @mdev:	The media device
- * @entity:	The entity
- */
-int __must_check media_device_register_entity(struct media_device *mdev,
-					      struct media_entity *entity)
-{
-	struct media_entity_notify *notify, *next;
-	unsigned int i;
-	int ret;
-
-	if (entity->function == MEDIA_ENT_F_V4L2_SUBDEV_UNKNOWN ||
-	    entity->function == MEDIA_ENT_F_UNKNOWN)
-		dev_warn(mdev->dev,
-			 "Entity type for entity %s was not initialized!\n",
-			 entity->name);
-
-	/* Warn if we apparently re-register an entity */
-	WARN_ON(entity->graph_obj.mdev != NULL);
-	entity->graph_obj.mdev = mdev;
-	INIT_LIST_HEAD(&entity->links);
-	entity->num_links = 0;
-	entity->num_backlinks = 0;
-
-	ret = ida_alloc_min(&mdev->entity_internal_idx, 1, GFP_KERNEL);
-	if (ret < 0)
-		return ret;
-	entity->internal_idx = ret;
-
-	mutex_lock(&mdev->graph_mutex);
-	mdev->entity_internal_idx_max =
-		max(mdev->entity_internal_idx_max, entity->internal_idx);
-
-	/* Initialize media_gobj embedded at the entity */
-	media_gobj_create(mdev, MEDIA_GRAPH_ENTITY, &entity->graph_obj);
-
-	/* Initialize objects at the pads */
-	for (i = 0; i < entity->num_pads; i++)
-		media_gobj_create(mdev, MEDIA_GRAPH_PAD,
-			       &entity->pads[i].graph_obj);
-
-	/* invoke entity_notify callbacks */
-	list_for_each_entry_safe(notify, next, &mdev->entity_notify, list)
-		notify->notify(entity, notify->notify_data);
-
-	if (mdev->entity_internal_idx_max
-	    >= mdev->pm_count_walk.ent_enum.idx_max) {
-		struct media_graph new = { .top = 0 };
-
-		/*
-		 * Initialise the new graph walk before cleaning up
-		 * the old one in order not to spoil the graph walk
-		 * object of the media device if graph walk init fails.
-		 */
-		ret = media_graph_walk_init(&new, mdev);
-		if (ret) {
-			mutex_unlock(&mdev->graph_mutex);
-			return ret;
-		}
-		media_graph_walk_cleanup(&mdev->pm_count_walk);
-		mdev->pm_count_walk = new;
-	}
-	mutex_unlock(&mdev->graph_mutex);
-
-	return 0;
-}
-EXPORT_SYMBOL_GPL(media_device_register_entity);
-
-static void __media_device_unregister_entity(struct media_entity *entity)
-{
-	struct media_device *mdev = entity->graph_obj.mdev;
-	struct media_link *link, *tmp;
-	struct media_interface *intf;
-	unsigned int i;
-
-	ida_free(&mdev->entity_internal_idx, entity->internal_idx);
-
-	/* Remove all interface links pointing to this entity */
-	list_for_each_entry(intf, &mdev->interfaces, graph_obj.list) {
-		list_for_each_entry_safe(link, tmp, &intf->links, list) {
-			if (link->entity == entity)
-				__media_remove_intf_link(link);
-		}
-	}
-
-	/* Remove all data links that belong to this entity */
-	__media_entity_remove_links(entity);
-
-	/* Remove all pads that belong to this entity */
-	for (i = 0; i < entity->num_pads; i++)
-		media_gobj_destroy(&entity->pads[i].graph_obj);
-
-	/* Remove the entity */
-	media_gobj_destroy(&entity->graph_obj);
-
-	/* invoke entity_notify callbacks to handle entity removal?? */
-
-	entity->graph_obj.mdev = NULL;
-}
-
-void media_device_unregister_entity(struct media_entity *entity)
-{
-	struct media_device *mdev = entity->graph_obj.mdev;
-
-	if (mdev == NULL)
-		return;
-
-	mutex_lock(&mdev->graph_mutex);
-	__media_device_unregister_entity(entity);
-	mutex_unlock(&mdev->graph_mutex);
-}
-EXPORT_SYMBOL_GPL(media_device_unregister_entity);
-
-/**
- * media_device_init() - initialize a media device
- * @mdev:	The media device
- *
- * The caller is responsible for initializing the media device before
- * registration. The following fields must be set:
- *
- * - dev must point to the parent device
- * - model must be filled with the device model name
- */
-void media_device_init(struct media_device *mdev)
-{
-	INIT_LIST_HEAD(&mdev->entities);
-	INIT_LIST_HEAD(&mdev->interfaces);
-	INIT_LIST_HEAD(&mdev->pads);
-	INIT_LIST_HEAD(&mdev->links);
-	INIT_LIST_HEAD(&mdev->entity_notify);
-
-	mutex_init(&mdev->req_queue_mutex);
-	mutex_init(&mdev->graph_mutex);
-	ida_init(&mdev->entity_internal_idx);
-
-	atomic_set(&mdev->request_id, 0);
-
-	dev_dbg(mdev->dev, "Media device initialized\n");
-}
-EXPORT_SYMBOL_GPL(media_device_init);
-
-void media_device_cleanup(struct media_device *mdev)
-{
-	ida_destroy(&mdev->entity_internal_idx);
-	mdev->entity_internal_idx_max = 0;
-	media_graph_walk_cleanup(&mdev->pm_count_walk);
-	mutex_destroy(&mdev->graph_mutex);
-	mutex_destroy(&mdev->req_queue_mutex);
-}
-EXPORT_SYMBOL_GPL(media_device_cleanup);
-
-int __must_check __media_device_register(struct media_device *mdev,
-					 struct module *owner)
-{
-	struct media_devnode *devnode;
-	int ret;
-
-	devnode = kzalloc(sizeof(*devnode), GFP_KERNEL);
-	if (!devnode)
-		return -ENOMEM;
-
-	/* Register the device node. */
-	mdev->devnode = devnode;
-	devnode->fops = &media_device_fops;
-	devnode->parent = mdev->dev;
-	devnode->release = media_device_release;
-
-	/* Set version 0 to indicate user-space that the graph is static */
-	mdev->topology_version = 0;
-
-	ret = media_devnode_register(mdev, devnode, owner);
-	if (ret < 0) {
-		/* devnode free is handled in media_devnode_*() */
-		mdev->devnode = NULL;
-		return ret;
-	}
-
-	ret = device_create_file(&devnode->dev, &dev_attr_model);
-	if (ret < 0) {
-		/* devnode free is handled in media_devnode_*() */
-		mdev->devnode = NULL;
-		media_devnode_unregister_prepare(devnode);
-		media_devnode_unregister(devnode);
-		return ret;
-	}
-
-	dev_dbg(mdev->dev, "Media device registered\n");
-
-	return 0;
-}
-EXPORT_SYMBOL_GPL(__media_device_register);
-
-int __must_check media_device_register_entity_notify(struct media_device *mdev,
-					struct media_entity_notify *nptr)
-{
-	mutex_lock(&mdev->graph_mutex);
-	list_add_tail(&nptr->list, &mdev->entity_notify);
-	mutex_unlock(&mdev->graph_mutex);
-	return 0;
-}
-EXPORT_SYMBOL_GPL(media_device_register_entity_notify);
-
-/*
- * Note: Should be called with mdev->lock held.
- */
-static void __media_device_unregister_entity_notify(struct media_device *mdev,
-					struct media_entity_notify *nptr)
-{
-	list_del(&nptr->list);
-}
-
-void media_device_unregister_entity_notify(struct media_device *mdev,
-					struct media_entity_notify *nptr)
-{
-	mutex_lock(&mdev->graph_mutex);
-	__media_device_unregister_entity_notify(mdev, nptr);
-	mutex_unlock(&mdev->graph_mutex);
-}
-EXPORT_SYMBOL_GPL(media_device_unregister_entity_notify);
-
-void media_device_unregister(struct media_device *mdev)
-{
-	struct media_entity *entity;
-	struct media_entity *next;
-	struct media_interface *intf, *tmp_intf;
-	struct media_entity_notify *notify, *nextp;
-
-	if (mdev == NULL)
-		return;
-
-	mutex_lock(&mdev->graph_mutex);
-
-	/* Check if mdev was ever registered at all */
-	if (!media_devnode_is_registered(mdev->devnode)) {
-		mutex_unlock(&mdev->graph_mutex);
-		return;
-	}
-
-	/* Clear the devnode register bit to avoid races with media dev open */
-	media_devnode_unregister_prepare(mdev->devnode);
-
-	/* Remove all entities from the media device */
-	list_for_each_entry_safe(entity, next, &mdev->entities, graph_obj.list)
-		__media_device_unregister_entity(entity);
-
-	/* Remove all entity_notify callbacks from the media device */
-	list_for_each_entry_safe(notify, nextp, &mdev->entity_notify, list)
-		__media_device_unregister_entity_notify(mdev, notify);
-
-	/* Remove all interfaces from the media device */
-	list_for_each_entry_safe(intf, tmp_intf, &mdev->interfaces,
-				 graph_obj.list) {
-		/*
-		 * Unlink the interface, but don't free it here; the
-		 * module which created it is responsible for freeing
-		 * it
-		 */
-		__media_remove_intf_links(intf);
-		media_gobj_destroy(&intf->graph_obj);
-	}
-
-	mutex_unlock(&mdev->graph_mutex);
-
-	dev_dbg(mdev->dev, "Media device unregistered\n");
-
-	device_remove_file(&mdev->devnode->dev, &dev_attr_model);
-	media_devnode_unregister(mdev->devnode);
-	/* devnode free is handled in media_devnode_*() */
-	mdev->devnode = NULL;
-}
-EXPORT_SYMBOL_GPL(media_device_unregister);
-
-#if IS_ENABLED(CONFIG_PCI)
-void media_device_pci_init(struct media_device *mdev,
-			   struct pci_dev *pci_dev,
-			   const char *name)
-{
-	mdev->dev = &pci_dev->dev;
-
-	if (name)
-		strscpy(mdev->model, name, sizeof(mdev->model));
-	else
-		strscpy(mdev->model, pci_name(pci_dev), sizeof(mdev->model));
-
-	sprintf(mdev->bus_info, "PCI:%s", pci_name(pci_dev));
-
-	mdev->hw_revision = (pci_dev->subsystem_vendor << 16)
-			    | pci_dev->subsystem_device;
-
-	media_device_init(mdev);
-}
-EXPORT_SYMBOL_GPL(media_device_pci_init);
-#endif
-
-#if IS_ENABLED(CONFIG_USB)
-void __media_device_usb_init(struct media_device *mdev,
-			     struct usb_device *udev,
-			     const char *board_name,
-			     const char *driver_name)
-{
-	mdev->dev = &udev->dev;
-
-	if (driver_name)
-		strscpy(mdev->driver_name, driver_name,
-			sizeof(mdev->driver_name));
-
-	if (board_name)
-		strscpy(mdev->model, board_name, sizeof(mdev->model));
-	else if (udev->product)
-		strscpy(mdev->model, udev->product, sizeof(mdev->model));
-	else
-		strscpy(mdev->model, "unknown model", sizeof(mdev->model));
-	if (udev->serial)
-		strscpy(mdev->serial, udev->serial, sizeof(mdev->serial));
-	usb_make_path(udev, mdev->bus_info, sizeof(mdev->bus_info));
-	mdev->hw_revision = le16_to_cpu(udev->descriptor.bcdDevice);
-
-	media_device_init(mdev);
-}
-EXPORT_SYMBOL_GPL(__media_device_usb_init);
-#endif
-
-
-#endif /* CONFIG_MEDIA_CONTROLLER */