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

/*
 * 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.
 *
 * 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/compat.h>
#include <linux/export.h>
#include <linux/ioctl.h>
#include <linux/media.h>
#include <linux/slab.h>
#include <linux/types.h>

#include <media/media-device.h>
#include <media/media-devnode.h>
#include <media/media-entity.h>

#ifdef CONFIG_MEDIA_CONTROLLER

/* -----------------------------------------------------------------------------
 * Userspace API
 */

static int media_device_open(struct file *filp)
{
	return 0;
}

static int media_device_close(struct file *filp)
{
	return 0;
}

static int media_device_get_info(struct media_device *dev,
				 struct media_device_info __user *__info)
{
	struct media_device_info info;

	memset(&info, 0, sizeof(info));

	strlcpy(info.driver, dev->dev->driver->name, sizeof(info.driver));
	strlcpy(info.model, dev->model, sizeof(info.model));
	strlcpy(info.serial, dev->serial, sizeof(info.serial));
	strlcpy(info.bus_info, dev->bus_info, sizeof(info.bus_info));

	info.media_version = MEDIA_API_VERSION;
	info.hw_revision = dev->hw_revision;
	info.driver_version = dev->driver_version;

	if (copy_to_user(__info, &info, sizeof(*__info)))
		return -EFAULT;
	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;

	spin_lock(&mdev->lock);

	media_device_for_each_entity(entity, mdev) {
		if (((media_entity_id(entity) == id) && !next) ||
		    ((media_entity_id(entity) > id) && next)) {
			spin_unlock(&mdev->lock);
			return entity;
		}
	}

	spin_unlock(&mdev->lock);

	return NULL;
}

static long media_device_enum_entities(struct media_device *mdev,
				       struct media_entity_desc __user *uent)
{
	struct media_entity *ent;
	struct media_entity_desc u_ent;

	memset(&u_ent, 0, sizeof(u_ent));
	if (copy_from_user(&u_ent.id, &uent->id, sizeof(u_ent.id)))
		return -EFAULT;

	ent = find_entity(mdev, u_ent.id);

	if (ent == NULL)
		return -EINVAL;

	u_ent.id = media_entity_id(ent);
	if (ent->name)
		strlcpy(u_ent.name, ent->name, sizeof(u_ent.name));
	u_ent.type = ent->function;
	u_ent.revision = ent->revision;
	u_ent.flags = ent->flags;
	u_ent.group_id = ent->group_id;
	u_ent.pads = ent->num_pads;
	u_ent.links = ent->num_links - ent->num_backlinks;
	memcpy(&u_ent.raw, &ent->info, sizeof(ent->info));
	if (copy_to_user(uent, &u_ent, sizeof(u_ent)))
		return -EFAULT;
	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,
				      struct media_links_enum *links)
{
	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++;
		}
	}

	return 0;
}

static long media_device_enum_links(struct media_device *mdev,
				    struct media_links_enum __user *ulinks)
{
	struct media_links_enum links;
	int rval;

	if (copy_from_user(&links, ulinks, sizeof(links)))
		return -EFAULT;

	rval = __media_device_enum_links(mdev, &links);
	if (rval < 0)
		return rval;

	if (copy_to_user(ulinks, &links, sizeof(*ulinks)))
		return -EFAULT;

	return 0;
}

static long media_device_setup_link(struct media_device *mdev,
				    struct media_link_desc __user *_ulink)
{
	struct media_link *link = NULL;
	struct media_link_desc ulink;
	struct media_entity *source;
	struct media_entity *sink;
	int ret;

	if (copy_from_user(&ulink, _ulink, sizeof(ulink)))
		return -EFAULT;

	/* Find the source and sink entities and link.
	 */
	source = find_entity(mdev, ulink.source.entity);
	sink = find_entity(mdev, ulink.sink.entity);

	if (source == NULL || sink == NULL)
		return -EINVAL;

	if (ulink.source.index >= source->num_pads ||
	    ulink.sink.index >= sink->num_pads)
		return -EINVAL;

	link = media_entity_find_link(&source->pads[ulink.source.index],
				      &sink->pads[ulink.sink.index]);
	if (link == NULL)
		return -EINVAL;

	/* Setup the link on both entities. */
	ret = __media_entity_setup_link(link, ulink.flags);

	if (copy_to_user(_ulink, &ulink, sizeof(ulink)))
		return -EFAULT;

	return ret;
}

static long __media_device_get_topology(struct media_device *mdev,
				      struct media_v2_topology *topo)
{
	struct media_entity *entity;
	struct media_interface *intf;
	struct media_pad *pad;
	struct media_link *link;
	struct media_v2_entity uentity;
	struct media_v2_interface uintf;
	struct media_v2_pad upad;
	struct media_v2_link ulink;
	unsigned int i;
	int ret = 0;

	topo->topology_version = mdev->topology_version;

	/* Get entities and number of entities */
	i = 0;
	media_device_for_each_entity(entity, mdev) {
		i++;

		if (ret || !topo->entities)
			continue;

		if (i > topo->num_entities) {
			ret = -ENOSPC;
			continue;
		}

		/* Copy fields to userspace struct if not error */
		memset(&uentity, 0, sizeof(uentity));
		uentity.id = entity->graph_obj.id;
		uentity.function = entity->function;
		strncpy(uentity.name, entity->name,
			sizeof(uentity.name));

		if (copy_to_user(&topo->entities[i - 1], &uentity, sizeof(uentity)))
			ret = -EFAULT;
	}
	topo->num_entities = i;

	/* Get interfaces and number of interfaces */
	i = 0;
	media_device_for_each_intf(intf, mdev) {
		i++;

		if (ret || !topo->interfaces)
			continue;

		if (i > topo->num_interfaces) {
			ret = -ENOSPC;
			continue;
		}

		memset(&uintf, 0, sizeof(uintf));

		/* Copy intf fields to userspace struct */
		uintf.id = intf->graph_obj.id;
		uintf.intf_type = intf->type;
		uintf.flags = intf->flags;

		if (media_type(&intf->graph_obj) == MEDIA_GRAPH_INTF_DEVNODE) {
			struct media_intf_devnode *devnode;

			devnode = intf_to_devnode(intf);

			uintf.devnode.major = devnode->major;
			uintf.devnode.minor = devnode->minor;
		}

		if (copy_to_user(&topo->interfaces[i - 1], &uintf, sizeof(uintf)))
			ret = -EFAULT;
	}
	topo->num_interfaces = i;

	/* Get pads and number of pads */
	i = 0;
	media_device_for_each_pad(pad, mdev) {
		i++;

		if (ret || !topo->pads)
			continue;

		if (i > topo->num_pads) {
			ret = -ENOSPC;
			continue;
		}

		memset(&upad, 0, sizeof(upad));

		/* Copy pad fields to userspace struct */
		upad.id = pad->graph_obj.id;
		upad.entity_id = pad->entity->graph_obj.id;
		upad.flags = pad->flags;

		if (copy_to_user(&topo->pads[i - 1], &upad, sizeof(upad)))
			ret = -EFAULT;
	}
	topo->num_pads = i;

	/* Get links and number of links */
	i = 0;
	media_device_for_each_link(link, mdev) {
		if (link->is_backlink)
			continue;

		i++;

		if (ret || !topo->links)
			continue;

		if (i > topo->num_links) {
			ret = -ENOSPC;
			continue;
		}

		memset(&ulink, 0, sizeof(ulink));

		/* Copy link fields to userspace struct */
		ulink.id = link->graph_obj.id;
		ulink.source_id = link->gobj0->id;
		ulink.sink_id = link->gobj1->id;
		ulink.flags = link->flags;

		if (media_type(link->gobj0) != MEDIA_GRAPH_PAD)
			ulink.flags |= MEDIA_LNK_FL_INTERFACE_LINK;

		if (copy_to_user(&topo->links[i - 1], &ulink, sizeof(ulink)))
			ret = -EFAULT;
	}
	topo->num_links = i;

	return ret;
}

static long media_device_get_topology(struct media_device *mdev,
				      struct media_v2_topology __user *utopo)
{
	struct media_v2_topology ktopo;
	int ret;

	ret = copy_from_user(&ktopo, utopo, sizeof(ktopo));

	if (ret < 0)
		return ret;

	ret = __media_device_get_topology(mdev, &ktopo);
	if (ret < 0)
		return ret;

	ret = copy_to_user(utopo, &ktopo, sizeof(*utopo));

	return ret;
}

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 = to_media_device(devnode);
	long ret;

	switch (cmd) {
	case MEDIA_IOC_DEVICE_INFO:
		ret = media_device_get_info(dev,
				(struct media_device_info __user *)arg);
		break;

	case MEDIA_IOC_ENUM_ENTITIES:
		ret = media_device_enum_entities(dev,
				(struct media_entity_desc __user *)arg);
		break;

	case MEDIA_IOC_ENUM_LINKS:
		mutex_lock(&dev->graph_mutex);
		ret = media_device_enum_links(dev,
				(struct media_links_enum __user *)arg);
		mutex_unlock(&dev->graph_mutex);
		break;

	case MEDIA_IOC_SETUP_LINK:
		mutex_lock(&dev->graph_mutex);
		ret = media_device_setup_link(dev,
				(struct media_link_desc __user *)arg);
		mutex_unlock(&dev->graph_mutex);
		break;

	case MEDIA_IOC_G_TOPOLOGY:
		mutex_lock(&dev->graph_mutex);
		ret = media_device_get_topology(dev,
				(struct media_v2_topology __user *)arg);
		mutex_unlock(&dev->graph_mutex);
		break;

	default:
		ret = -ENOIOCTLCMD;
	}

	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;

	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);

	return __media_device_enum_links(mdev, &links);
}

#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 = to_media_device(devnode);
	long ret;

	switch (cmd) {
	case MEDIA_IOC_DEVICE_INFO:
	case MEDIA_IOC_ENUM_ENTITIES:
	case MEDIA_IOC_SETUP_LINK:
	case MEDIA_IOC_G_TOPOLOGY:
		return media_device_ioctl(filp, cmd, arg);

	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:
		ret = -ENOIOCTLCMD;
	}

	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_device *mdev = to_media_device(to_media_devnode(cd));

	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 *mdev)
{
	dev_dbg(mdev->parent, "Media device released\n");
}

/**
 * media_device_register - register 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
 */
int __must_check __media_device_register(struct media_device *mdev,
					 struct module *owner)
{
	int ret;

	if (WARN_ON(mdev->dev == NULL || mdev->model[0] == 0))
		return -EINVAL;

	INIT_LIST_HEAD(&mdev->entities);
	INIT_LIST_HEAD(&mdev->interfaces);
	INIT_LIST_HEAD(&mdev->pads);
	INIT_LIST_HEAD(&mdev->links);
	spin_lock_init(&mdev->lock);
	mutex_init(&mdev->graph_mutex);

	/* Register the device node. */
	mdev->devnode.fops = &media_device_fops;
	mdev->devnode.parent = mdev->dev;
	mdev->devnode.release = media_device_release;
	ret = media_devnode_register(&mdev->devnode, owner);
	if (ret < 0)
		return ret;

	ret = device_create_file(&mdev->devnode.dev, &dev_attr_model);
	if (ret < 0) {
		media_devnode_unregister(&mdev->devnode);
		return ret;
	}

	dev_dbg(mdev->dev, "Media device registered\n");

	return 0;
}
EXPORT_SYMBOL_GPL(__media_device_register);

/**
 * media_device_unregister - unregister a media device
 * @mdev:	The media device
 *
 */
void media_device_unregister(struct media_device *mdev)
{
	struct media_entity *entity;
	struct media_entity *next;
	struct media_interface *intf, *tmp_intf;

	/* 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 interfaces from the media device */
	spin_lock(&mdev->lock);
	list_for_each_entry_safe(intf, tmp_intf, &mdev->interfaces,
				 graph_obj.list) {
		__media_remove_intf_links(intf);
		media_gobj_remove(&intf->graph_obj);
		kfree(intf);
	}
	spin_unlock(&mdev->lock);

	device_remove_file(&mdev->devnode.dev, &dev_attr_model);
	media_devnode_unregister(&mdev->devnode);

	dev_dbg(mdev->dev, "Media device unregistered\n");
}
EXPORT_SYMBOL_GPL(media_device_unregister);

/**
 * 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)
{
	unsigned int i;

	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;

	spin_lock(&mdev->lock);
	/* Initialize media_gobj embedded at the entity */
	media_gobj_init(mdev, MEDIA_GRAPH_ENTITY, &entity->graph_obj);

	/* Initialize objects at the pads */
	for (i = 0; i < entity->num_pads; i++)
		media_gobj_init(mdev, MEDIA_GRAPH_PAD,
			       &entity->pads[i].graph_obj);

	spin_unlock(&mdev->lock);

	return 0;
}
EXPORT_SYMBOL_GPL(media_device_register_entity);

/**
 * media_device_unregister_entity - Unregister an entity
 * @entity:	The entity
 *
 * If the entity has never been registered this function will return
 * immediately.
 */
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;

	if (mdev == NULL)
		return;

	spin_lock(&mdev->lock);

	/* 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_remove(&entity->pads[i].graph_obj);

	/* Remove the entity */
	media_gobj_remove(&entity->graph_obj);

	spin_unlock(&mdev->lock);
	entity->graph_obj.mdev = NULL;
}
EXPORT_SYMBOL_GPL(media_device_unregister_entity);

static void media_device_release_devres(struct device *dev, void *res)
{
}

/*
 * media_device_get_devres() -	get media device as device resource
 *				creates if one doesn't exist
*/
struct media_device *media_device_get_devres(struct device *dev)
{
	struct media_device *mdev;

	mdev = devres_find(dev, media_device_release_devres, NULL, NULL);
	if (mdev)
		return mdev;

	mdev = devres_alloc(media_device_release_devres,
				sizeof(struct media_device), GFP_KERNEL);
	if (!mdev)
		return NULL;
	return devres_get(dev, mdev, NULL, NULL);
}
EXPORT_SYMBOL_GPL(media_device_get_devres);

/*
 * media_device_find_devres() - find media device as device resource
*/
struct media_device *media_device_find_devres(struct device *dev)
{
	return devres_find(dev, media_device_release_devres, NULL, NULL);
}
EXPORT_SYMBOL_GPL(media_device_find_devres);

#endif /* CONFIG_MEDIA_CONTROLLER */
Commit	Line	Data
176fb0d1 LP	1	/*
	2	* Media device
	3	*
	4	* Copyright (C) 2010 Nokia Corporation
	5	*
	6	* Contacts: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
	7	* Sakari Ailus <sakari.ailus@iki.fi>
	8	*
	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.
	12	*
	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.
	17	*
	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
	21	*/
	22
b0a1f2a8 SA	23	#include <linux/compat.h>
b0a1f2a8 SA	24	#include <linux/export.h>
176fb0d1	25	#include <linux/ioctl.h>
140d8816	26	#include <linux/media.h>
57208e5e	27	#include <linux/slab.h>
497e80cd	28	#include <linux/types.h>
176fb0d1 LP	29
	30	#include <media/media-device.h>
	31	#include <media/media-devnode.h>
53e269c1	32	#include <media/media-entity.h>
176fb0d1	33
e576d60b SK	34	#ifdef CONFIG_MEDIA_CONTROLLER
e576d60b SK	35
140d8816 LP	36	/* -----------------------------------------------------------------------------
	37	* Userspace API
	38	*/
	39
	40	static int media_device_open(struct file *filp)
	41	{
	42	return 0;
	43	}
	44
	45	static int media_device_close(struct file *filp)
	46	{
	47	return 0;
	48	}
	49
	50	static int media_device_get_info(struct media_device *dev,
	51	struct media_device_info __user *__info)
	52	{
	53	struct media_device_info info;
	54
	55	memset(&info, 0, sizeof(info));
	56
	57	strlcpy(info.driver, dev->dev->driver->name, sizeof(info.driver));
	58	strlcpy(info.model, dev->model, sizeof(info.model));
	59	strlcpy(info.serial, dev->serial, sizeof(info.serial));
	60	strlcpy(info.bus_info, dev->bus_info, sizeof(info.bus_info));
	61
	62	info.media_version = MEDIA_API_VERSION;
	63	info.hw_revision = dev->hw_revision;
	64	info.driver_version = dev->driver_version;
	65
b17d3945 NT	66	if (copy_to_user(__info, &info, sizeof(*__info)))
	67	return -EFAULT;
	68	return 0;
140d8816 LP	69	}
140d8816 LP	70
1651333b LP	71	static struct media_entity find_entity(struct media_device mdev, u32 id)
	72	{
	73	struct media_entity *entity;
	74	int next = id & MEDIA_ENT_ID_FLAG_NEXT;
	75
	76	id &= ~MEDIA_ENT_ID_FLAG_NEXT;
	77
	78	spin_lock(&mdev->lock);
	79
	80	media_device_for_each_entity(entity, mdev) {
fa762394 MCC	81	if (((media_entity_id(entity) == id) && !next) \|\|
fa762394 MCC	82	((media_entity_id(entity) > id) && next)) {
1651333b LP	83	spin_unlock(&mdev->lock);
	84	return entity;
	85	}
	86	}
	87
	88	spin_unlock(&mdev->lock);
	89
	90	return NULL;
	91	}
	92
	93	static long media_device_enum_entities(struct media_device *mdev,
	94	struct media_entity_desc __user *uent)
	95	{
	96	struct media_entity *ent;
	97	struct media_entity_desc u_ent;
	98
e6a62346	99	memset(&u_ent, 0, sizeof(u_ent));
1651333b LP	100	if (copy_from_user(&u_ent.id, &uent->id, sizeof(u_ent.id)))
	101	return -EFAULT;
	102
	103	ent = find_entity(mdev, u_ent.id);
	104
	105	if (ent == NULL)
	106	return -EINVAL;
	107
fa762394	108	u_ent.id = media_entity_id(ent);
de8eae36 LP	109	if (ent->name)
de8eae36 LP	110	strlcpy(u_ent.name, ent->name, sizeof(u_ent.name));
0e576b76	111	u_ent.type = ent->function;
1651333b LP	112	u_ent.revision = ent->revision;
	113	u_ent.flags = ent->flags;
	114	u_ent.group_id = ent->group_id;
	115	u_ent.pads = ent->num_pads;
	116	u_ent.links = ent->num_links - ent->num_backlinks;
fa5034c6	117	memcpy(&u_ent.raw, &ent->info, sizeof(ent->info));
1651333b LP	118	if (copy_to_user(uent, &u_ent, sizeof(u_ent)))
	119	return -EFAULT;
	120	return 0;
	121	}
	122
	123	static void media_device_kpad_to_upad(const struct media_pad *kpad,
	124	struct media_pad_desc *upad)
	125	{
fa762394	126	upad->entity = media_entity_id(kpad->entity);
1651333b LP	127	upad->index = kpad->index;
	128	upad->flags = kpad->flags;
	129	}
	130
b0a1f2a8 SA	131	static long __media_device_enum_links(struct media_device *mdev,
b0a1f2a8 SA	132	struct media_links_enum *links)
1651333b LP	133	{
1651333b LP	134	struct media_entity *entity;
1651333b	135
b0a1f2a8	136	entity = find_entity(mdev, links->entity);
1651333b LP	137	if (entity == NULL)
	138	return -EINVAL;
	139
b0a1f2a8	140	if (links->pads) {
1651333b LP	141	unsigned int p;
	142
	143	for (p = 0; p < entity->num_pads; p++) {
	144	struct media_pad_desc pad;
c88e739b DC	145
c88e739b DC	146	memset(&pad, 0, sizeof(pad));
1651333b	147	media_device_kpad_to_upad(&entity->pads[p], &pad);
b0a1f2a8	148	if (copy_to_user(&links->pads[p], &pad, sizeof(pad)))
1651333b LP	149	return -EFAULT;
	150	}
	151	}
	152
b0a1f2a8	153	if (links->links) {
b83e2508 MCC	154	struct media_link *link;
b83e2508 MCC	155	struct media_link_desc __user *ulink_desc = links->links;
1651333b	156
b83e2508 MCC	157	list_for_each_entry(link, &entity->links, list) {
b83e2508 MCC	158	struct media_link_desc klink_desc;
1651333b LP	159
1651333b LP	160	/* Ignore backlinks. */
b83e2508	161	if (link->source->entity != entity)
1651333b	162	continue;
b83e2508 MCC	163	memset(&klink_desc, 0, sizeof(klink_desc));
	164	media_device_kpad_to_upad(link->source,
	165	&klink_desc.source);
	166	media_device_kpad_to_upad(link->sink,
	167	&klink_desc.sink);
	168	klink_desc.flags = link->flags;
	169	if (copy_to_user(ulink_desc, &klink_desc,
	170	sizeof(*ulink_desc)))
1651333b	171	return -EFAULT;
b83e2508	172	ulink_desc++;
1651333b LP	173	}
1651333b LP	174	}
b0a1f2a8 SA	175
	176	return 0;
	177	}
	178
	179	static long media_device_enum_links(struct media_device *mdev,
	180	struct media_links_enum __user *ulinks)
	181	{
	182	struct media_links_enum links;
	183	int rval;
	184
	185	if (copy_from_user(&links, ulinks, sizeof(links)))
	186	return -EFAULT;
	187
	188	rval = __media_device_enum_links(mdev, &links);
	189	if (rval < 0)
	190	return rval;
	191
1651333b LP	192	if (copy_to_user(ulinks, &links, sizeof(*ulinks)))
1651333b LP	193	return -EFAULT;
b0a1f2a8	194
1651333b LP	195	return 0;
	196	}
	197
97548ed4 LP	198	static long media_device_setup_link(struct media_device *mdev,
	199	struct media_link_desc __user *_ulink)
	200	{
	201	struct media_link *link = NULL;
	202	struct media_link_desc ulink;
	203	struct media_entity *source;
	204	struct media_entity *sink;
	205	int ret;
	206
	207	if (copy_from_user(&ulink, _ulink, sizeof(ulink)))
	208	return -EFAULT;
	209
	210	/* Find the source and sink entities and link.
	211	*/
	212	source = find_entity(mdev, ulink.source.entity);
	213	sink = find_entity(mdev, ulink.sink.entity);
	214
	215	if (source == NULL \|\| sink == NULL)
	216	return -EINVAL;
	217
	218	if (ulink.source.index >= source->num_pads \|\|
	219	ulink.sink.index >= sink->num_pads)
	220	return -EINVAL;
	221
	222	link = media_entity_find_link(&source->pads[ulink.source.index],
	223	&sink->pads[ulink.sink.index]);
	224	if (link == NULL)
	225	return -EINVAL;
	226
	227	/* Setup the link on both entities. */
	228	ret = __media_entity_setup_link(link, ulink.flags);
	229
	230	if (copy_to_user(_ulink, &ulink, sizeof(ulink)))
	231	return -EFAULT;
	232
	233	return ret;
	234	}
	235
8309f47c MCC	236	static long __media_device_get_topology(struct media_device *mdev,
	237	struct media_v2_topology *topo)
	238	{
	239	struct media_entity *entity;
	240	struct media_interface *intf;
	241	struct media_pad *pad;
	242	struct media_link *link;
	243	struct media_v2_entity uentity;
	244	struct media_v2_interface uintf;
	245	struct media_v2_pad upad;
	246	struct media_v2_link ulink;
9033b1a4 MCC	247	unsigned int i;
9033b1a4 MCC	248	int ret = 0;
8309f47c MCC	249
	250	topo->topology_version = mdev->topology_version;
	251
	252	/* Get entities and number of entities */
	253	i = 0;
	254	media_device_for_each_entity(entity, mdev) {
	255	i++;
	256
	257	if (ret \|\| !topo->entities)
	258	continue;
	259
	260	if (i > topo->num_entities) {
	261	ret = -ENOSPC;
	262	continue;
	263	}
	264
	265	/* Copy fields to userspace struct if not error */
	266	memset(&uentity, 0, sizeof(uentity));
	267	uentity.id = entity->graph_obj.id;
d87cdb88	268	uentity.function = entity->function;
8309f47c MCC	269	strncpy(uentity.name, entity->name,
	270	sizeof(uentity.name));
	271
	272	if (copy_to_user(&topo->entities[i - 1], &uentity, sizeof(uentity)))
	273	ret = -EFAULT;
	274	}
	275	topo->num_entities = i;
	276
	277	/* Get interfaces and number of interfaces */
	278	i = 0;
	279	media_device_for_each_intf(intf, mdev) {
	280	i++;
	281
	282	if (ret \|\| !topo->interfaces)
	283	continue;
	284
	285	if (i > topo->num_interfaces) {
	286	ret = -ENOSPC;
	287	continue;
	288	}
	289
	290	memset(&uintf, 0, sizeof(uintf));
	291
	292	/* Copy intf fields to userspace struct */
	293	uintf.id = intf->graph_obj.id;
	294	uintf.intf_type = intf->type;
	295	uintf.flags = intf->flags;
	296
	297	if (media_type(&intf->graph_obj) == MEDIA_GRAPH_INTF_DEVNODE) {
	298	struct media_intf_devnode *devnode;
	299
	300	devnode = intf_to_devnode(intf);
	301
	302	uintf.devnode.major = devnode->major;
	303	uintf.devnode.minor = devnode->minor;
	304	}
	305
	306	if (copy_to_user(&topo->interfaces[i - 1], &uintf, sizeof(uintf)))
	307	ret = -EFAULT;
	308	}
	309	topo->num_interfaces = i;
	310
	311	/* Get pads and number of pads */
	312	i = 0;
	313	media_device_for_each_pad(pad, mdev) {
	314	i++;
	315
	316	if (ret \|\| !topo->pads)
	317	continue;
	318
	319	if (i > topo->num_pads) {
	320	ret = -ENOSPC;
	321	continue;
	322	}
	323
	324	memset(&upad, 0, sizeof(upad));
	325
	326	/* Copy pad fields to userspace struct */
	327	upad.id = pad->graph_obj.id;
	328	upad.entity_id = pad->entity->graph_obj.id;
	329	upad.flags = pad->flags;
	330
	331	if (copy_to_user(&topo->pads[i - 1], &upad, sizeof(upad)))
	332	ret = -EFAULT;
333	}
334	topo->num_pads = i;
335
336	/* Get links and number of links */
337	i = 0;
338	media_device_for_each_link(link, mdev) {
39d1ebc6 MCC	339	if (link->is_backlink)
	340	continue;
	341
8309f47c MCC	342	i++;
	343
	344	if (ret \|\| !topo->links)
	345	continue;
	346
	347	if (i > topo->num_links) {
	348	ret = -ENOSPC;
	349	continue;
	350	}
	351
	352	memset(&ulink, 0, sizeof(ulink));
	353
	354	/* Copy link fields to userspace struct */
	355	ulink.id = link->graph_obj.id;
	356	ulink.source_id = link->gobj0->id;
	357	ulink.sink_id = link->gobj1->id;
	358	ulink.flags = link->flags;
	359
	360	if (media_type(link->gobj0) != MEDIA_GRAPH_PAD)
	361	ulink.flags \|= MEDIA_LNK_FL_INTERFACE_LINK;
	362
	363	if (copy_to_user(&topo->links[i - 1], &ulink, sizeof(ulink)))
	364	ret = -EFAULT;
	365	}
	366	topo->num_links = i;
	367
	368	return ret;
	369	}
	370
	371	static long media_device_get_topology(struct media_device *mdev,
	372	struct media_v2_topology __user *utopo)
	373	{
	374	struct media_v2_topology ktopo;
	375	int ret;
	376
	377	ret = copy_from_user(&ktopo, utopo, sizeof(ktopo));
	378
	379	if (ret < 0)
	380	return ret;
	381
	382	ret = __media_device_get_topology(mdev, &ktopo);
	383	if (ret < 0)
	384	return ret;
	385
	386	ret = copy_to_user(utopo, &ktopo, sizeof(*utopo));
	387
	388	return ret;
	389	}
	390
140d8816 LP	391	static long media_device_ioctl(struct file *filp, unsigned int cmd,
	392	unsigned long arg)
	393	{
	394	struct media_devnode *devnode = media_devnode_data(filp);
	395	struct media_device *dev = to_media_device(devnode);
	396	long ret;
	397
	398	switch (cmd) {
	399	case MEDIA_IOC_DEVICE_INFO:
	400	ret = media_device_get_info(dev,
	401	(struct media_device_info __user *)arg);
	402	break;
	403
1651333b LP	404	case MEDIA_IOC_ENUM_ENTITIES:
	405	ret = media_device_enum_entities(dev,
	406	(struct media_entity_desc __user *)arg);
	407	break;
	408
	409	case MEDIA_IOC_ENUM_LINKS:
	410	mutex_lock(&dev->graph_mutex);
	411	ret = media_device_enum_links(dev,
	412	(struct media_links_enum __user *)arg);
	413	mutex_unlock(&dev->graph_mutex);
	414	break;
	415
97548ed4 LP	416	case MEDIA_IOC_SETUP_LINK:
	417	mutex_lock(&dev->graph_mutex);
	418	ret = media_device_setup_link(dev,
	419	(struct media_link_desc __user *)arg);
	420	mutex_unlock(&dev->graph_mutex);
	421	break;
	422
8309f47c MCC	423	case MEDIA_IOC_G_TOPOLOGY:
	424	mutex_lock(&dev->graph_mutex);
	425	ret = media_device_get_topology(dev,
	426	(struct media_v2_topology __user *)arg);
	427	mutex_unlock(&dev->graph_mutex);
	428	break;
	429
140d8816 LP	430	default:
	431	ret = -ENOIOCTLCMD;
	432	}
	433
	434	return ret;
	435	}
	436
b0a1f2a8 SA	437	#ifdef CONFIG_COMPAT
	438
	439	struct media_links_enum32 {
	440	__u32 entity;
	441	compat_uptr_t pads; /* struct media_pad_desc * */
	442	compat_uptr_t links; /* struct media_link_desc * */
	443	__u32 reserved[4];
	444	};
	445
	446	static long media_device_enum_links32(struct media_device *mdev,
	447	struct media_links_enum32 __user *ulinks)
	448	{
	449	struct media_links_enum links;
	450	compat_uptr_t pads_ptr, links_ptr;
	451
	452	memset(&links, 0, sizeof(links));
	453
	454	if (get_user(links.entity, &ulinks->entity)
	455	\|\| get_user(pads_ptr, &ulinks->pads)
	456	\|\| get_user(links_ptr, &ulinks->links))
	457	return -EFAULT;
	458
	459	links.pads = compat_ptr(pads_ptr);
	460	links.links = compat_ptr(links_ptr);
	461
	462	return __media_device_enum_links(mdev, &links);
	463	}
	464
	465	#define MEDIA_IOC_ENUM_LINKS32 _IOWR('\|', 0x02, struct media_links_enum32)
	466
	467	static long media_device_compat_ioctl(struct file *filp, unsigned int cmd,
	468	unsigned long arg)
	469	{
	470	struct media_devnode *devnode = media_devnode_data(filp);
	471	struct media_device *dev = to_media_device(devnode);
	472	long ret;
	473
	474	switch (cmd) {
	475	case MEDIA_IOC_DEVICE_INFO:
	476	case MEDIA_IOC_ENUM_ENTITIES:
	477	case MEDIA_IOC_SETUP_LINK:
8309f47c	478	case MEDIA_IOC_G_TOPOLOGY:
b0a1f2a8 SA	479	return media_device_ioctl(filp, cmd, arg);
	480
	481	case MEDIA_IOC_ENUM_LINKS32:
	482	mutex_lock(&dev->graph_mutex);
	483	ret = media_device_enum_links32(dev,
	484	(struct media_links_enum32 __user *)arg);
	485	mutex_unlock(&dev->graph_mutex);
	486	break;
	487
	488	default:
	489	ret = -ENOIOCTLCMD;
	490	}
	491
	492	return ret;
	493	}
	494	#endif /* CONFIG_COMPAT */
	495
176fb0d1 LP	496	static const struct media_file_operations media_device_fops = {
176fb0d1 LP	497	.owner = THIS_MODULE,
140d8816 LP	498	.open = media_device_open,
140d8816 LP	499	.ioctl = media_device_ioctl,
b0a1f2a8 SA	500	#ifdef CONFIG_COMPAT
	501	.compat_ioctl = media_device_compat_ioctl,
	502	#endif /* CONFIG_COMPAT */
140d8816	503	.release = media_device_close,
176fb0d1 LP	504	};
	505
	506	/* -----------------------------------------------------------------------------
	507	* sysfs
	508	*/
	509
	510	static ssize_t show_model(struct device *cd,
	511	struct device_attribute attr, char buf)
	512	{
	513	struct media_device *mdev = to_media_device(to_media_devnode(cd));
	514
	515	return sprintf(buf, "%.*s\n", (int)sizeof(mdev->model), mdev->model);
	516	}
	517
	518	static DEVICE_ATTR(model, S_IRUGO, show_model, NULL);
	519
	520	/* -----------------------------------------------------------------------------
	521	* Registration/unregistration
	522	*/
	523
	524	static void media_device_release(struct media_devnode *mdev)
	525	{
8f5a3188	526	dev_dbg(mdev->parent, "Media device released\n");
176fb0d1 LP	527	}
	528
	529	/**
	530	* media_device_register - register a media device
	531	* @mdev: The media device
	532	*
	533	* The caller is responsible for initializing the media device before
	534	* registration. The following fields must be set:
	535	*
	536	* - dev must point to the parent device
	537	* - model must be filled with the device model name
	538	*/
85de721c SA	539	int __must_check __media_device_register(struct media_device *mdev,
85de721c SA	540	struct module *owner)
176fb0d1 LP	541	{
	542	int ret;
	543
	544	if (WARN_ON(mdev->dev == NULL \|\| mdev->model[0] == 0))
	545	return -EINVAL;
	546
53e269c1	547	INIT_LIST_HEAD(&mdev->entities);
57cf79b7	548	INIT_LIST_HEAD(&mdev->interfaces);
9155d859 MCC	549	INIT_LIST_HEAD(&mdev->pads);
9155d859 MCC	550	INIT_LIST_HEAD(&mdev->links);
53e269c1	551	spin_lock_init(&mdev->lock);
503c3d82	552	mutex_init(&mdev->graph_mutex);
53e269c1	553
176fb0d1 LP	554	/* Register the device node. */
	555	mdev->devnode.fops = &media_device_fops;
	556	mdev->devnode.parent = mdev->dev;
	557	mdev->devnode.release = media_device_release;
85de721c	558	ret = media_devnode_register(&mdev->devnode, owner);
176fb0d1 LP	559	if (ret < 0)
	560	return ret;
	561
	562	ret = device_create_file(&mdev->devnode.dev, &dev_attr_model);
	563	if (ret < 0) {
	564	media_devnode_unregister(&mdev->devnode);
	565	return ret;
	566	}
	567
8f5a3188 MCC	568	dev_dbg(mdev->dev, "Media device registered\n");
8f5a3188 MCC	569
176fb0d1 LP	570	return 0;
176fb0d1 LP	571	}
85de721c	572	EXPORT_SYMBOL_GPL(__media_device_register);
176fb0d1 LP	573
	574	/**
	575	* media_device_unregister - unregister a media device
	576	* @mdev: The media device
	577	*
	578	*/
	579	void media_device_unregister(struct media_device *mdev)
	580	{
53e269c1 LP	581	struct media_entity *entity;
53e269c1 LP	582	struct media_entity *next;
d47109fa MCC	583	struct media_interface intf, tmp_intf;
d47109fa MCC	584
f50d5166 MCC	585	/* Remove all entities from the media device */
	586	list_for_each_entry_safe(entity, next, &mdev->entities, graph_obj.list)
	587	media_device_unregister_entity(entity);
	588
d47109fa MCC	589	/* Remove all interfaces from the media device */
	590	spin_lock(&mdev->lock);
	591	list_for_each_entry_safe(intf, tmp_intf, &mdev->interfaces,
	592	graph_obj.list) {
	593	__media_remove_intf_links(intf);
	594	media_gobj_remove(&intf->graph_obj);
	595	kfree(intf);
	596	}
	597	spin_unlock(&mdev->lock);
53e269c1	598
176fb0d1 LP	599	device_remove_file(&mdev->devnode.dev, &dev_attr_model);
176fb0d1 LP	600	media_devnode_unregister(&mdev->devnode);
8f5a3188 MCC	601
8f5a3188 MCC	602	dev_dbg(mdev->dev, "Media device unregistered\n");
176fb0d1 LP	603	}
176fb0d1 LP	604	EXPORT_SYMBOL_GPL(media_device_unregister);
53e269c1 LP	605
	606	/**
	607	* media_device_register_entity - Register an entity with a media device
	608	* @mdev: The media device
	609	* @entity: The entity
	610	*/
	611	int __must_check media_device_register_entity(struct media_device *mdev,
	612	struct media_entity *entity)
	613	{
9033b1a4	614	unsigned int i;
18710dc6	615
4ca72efa MCC	616	if (entity->function == MEDIA_ENT_F_V4L2_SUBDEV_UNKNOWN \|\|
4ca72efa MCC	617	entity->function == MEDIA_ENT_F_UNKNOWN)
b50bde4e MCC	618	dev_warn(mdev->dev,
	619	"Entity type for entity %s was not initialized!\n",
	620	entity->name);
	621
53e269c1	622	/* Warn if we apparently re-register an entity */
d10c9894 JMC	623	WARN_ON(entity->graph_obj.mdev != NULL);
d10c9894 JMC	624	entity->graph_obj.mdev = mdev;
57208e5e	625	INIT_LIST_HEAD(&entity->links);
ab22e77c MCC	626	entity->num_links = 0;
ab22e77c MCC	627	entity->num_backlinks = 0;
53e269c1 LP	628
53e269c1 LP	629	spin_lock(&mdev->lock);
bfab2aac MCC	630	/* Initialize media_gobj embedded at the entity */
bfab2aac MCC	631	media_gobj_init(mdev, MEDIA_GRAPH_ENTITY, &entity->graph_obj);
18710dc6 MCC	632
	633	/* Initialize objects at the pads */
	634	for (i = 0; i < entity->num_pads; i++)
	635	media_gobj_init(mdev, MEDIA_GRAPH_PAD,
	636	&entity->pads[i].graph_obj);
	637
53e269c1 LP	638	spin_unlock(&mdev->lock);
	639
	640	return 0;
	641	}
	642	EXPORT_SYMBOL_GPL(media_device_register_entity);
	643
	644	/**
	645	* media_device_unregister_entity - Unregister an entity
	646	* @entity: The entity
	647	*
	648	* If the entity has never been registered this function will return
	649	* immediately.
	650	*/
	651	void media_device_unregister_entity(struct media_entity *entity)
	652	{
d10c9894	653	struct media_device *mdev = entity->graph_obj.mdev;
57208e5e	654	struct media_link link, tmp;
d47109fa	655	struct media_interface *intf;
9033b1a4	656	unsigned int i;
53e269c1 LP	657
	658	if (mdev == NULL)
	659	return;
	660
	661	spin_lock(&mdev->lock);
a28971ad	662
d47109fa MCC	663	/* Remove all interface links pointing to this entity */
	664	list_for_each_entry(intf, &mdev->interfaces, graph_obj.list) {
	665	list_for_each_entry_safe(link, tmp, &intf->links, list) {
f50d5166	666	if (link->entity == entity)
d47109fa	667	__media_remove_intf_link(link);
a28971ad MCC	668	}
	669	}
	670
	671	/* Remove all data links that belong to this entity */
d47109fa	672	__media_entity_remove_links(entity);
a28971ad MCC	673
a28971ad MCC	674	/* Remove all pads that belong to this entity */
18710dc6 MCC	675	for (i = 0; i < entity->num_pads; i++)
18710dc6 MCC	676	media_gobj_remove(&entity->pads[i].graph_obj);
a28971ad MCC	677
a28971ad MCC	678	/* Remove the entity */
bfab2aac	679	media_gobj_remove(&entity->graph_obj);
a28971ad	680
53e269c1	681	spin_unlock(&mdev->lock);
d10c9894	682	entity->graph_obj.mdev = NULL;
53e269c1 LP	683	}
53e269c1 LP	684	EXPORT_SYMBOL_GPL(media_device_unregister_entity);
d062f911 SK	685
	686	static void media_device_release_devres(struct device dev, void res)
	687	{
	688	}
	689
	690	/*
	691	* media_device_get_devres() - get media device as device resource
	692	* creates if one doesn't exist
	693	*/
	694	struct media_device media_device_get_devres(struct device dev)
	695	{
	696	struct media_device *mdev;
	697
	698	mdev = devres_find(dev, media_device_release_devres, NULL, NULL);
	699	if (mdev)
	700	return mdev;
	701
	702	mdev = devres_alloc(media_device_release_devres,
	703	sizeof(struct media_device), GFP_KERNEL);
	704	if (!mdev)
	705	return NULL;
	706	return devres_get(dev, mdev, NULL, NULL);
	707	}
	708	EXPORT_SYMBOL_GPL(media_device_get_devres);
	709
	710	/*
	711	* media_device_find_devres() - find media device as device resource
	712	*/
	713	struct media_device media_device_find_devres(struct device dev)
	714	{
	715	return devres_find(dev, media_device_release_devres, NULL, NULL);
	716	}
	717	EXPORT_SYMBOL_GPL(media_device_find_devres);
e576d60b SK	718
e576d60b SK	719	#endif /* CONFIG_MEDIA_CONTROLLER */