[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/types.h>
#include <linux/slab.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->type;
	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 *ent_link;
		struct media_link_desc __user *ulink = links->links;

		list_for_each_entry(ent_link, &entity->links, list) {
			struct media_link_desc link;

			/* Ignore backlinks. */
			if (ent_link->source->entity != entity)
				continue;
			memset(&link, 0, sizeof(link));
			media_device_kpad_to_upad(ent_link->source,
						  &link.source);
			media_device_kpad_to_upad(ent_link->sink,
						  &link.sink);
			link.flags = ent_link->flags;
			if (copy_to_user(ulink, &link, sizeof(*ulink)))
				return -EFAULT;
			ulink++;
		}
	}

	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;
	int ret = 0, i;

	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;
		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) {
		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;

	list_for_each_entry_safe(entity, next, &mdev->entities, graph_obj.list)
		media_device_unregister_entity(entity);

	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)
{
	int i;

	if (entity->type == MEDIA_ENT_T_V4L2_SUBDEV_UNKNOWN ||
	    entity->type == MEDIA_ENT_T_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);

	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)
{
	int i;
	struct media_device *mdev = entity->graph_obj.mdev;
	struct media_link *link, *tmp;

	if (mdev == NULL)
		return;

	spin_lock(&mdev->lock);

	/* Remove interface links with this entity on it */
	list_for_each_entry_safe(link, tmp, &mdev->links, graph_obj.list) {
		if (media_type(link->gobj1) == MEDIA_GRAPH_ENTITY
		    && link->entity == entity) {
			media_gobj_remove(&link->graph_obj);
			kfree(link);
		}
	}

	/* Remove all data links that belong to this entity */
	list_for_each_entry_safe(link, tmp, &entity->links, list) {
		media_gobj_remove(&link->graph_obj);
		list_del(&link->list);
		kfree(link);
	}

	/* 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>
b0a1f2a8	27	#include <linux/types.h>
57208e5e	28	#include <linux/slab.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));
1651333b LP	111	u_ent.type = ent->type;
	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) {
57208e5e MCC	154	struct media_link *ent_link;
57208e5e MCC	155	struct media_link_desc __user *ulink = links->links;
1651333b	156
57208e5e	157	list_for_each_entry(ent_link, &entity->links, list) {
1651333b LP	158	struct media_link_desc link;
	159
	160	/* Ignore backlinks. */
57208e5e	161	if (ent_link->source->entity != entity)
1651333b	162	continue;
c88e739b	163	memset(&link, 0, sizeof(link));
57208e5e	164	media_device_kpad_to_upad(ent_link->source,
1651333b	165	&link.source);
57208e5e	166	media_device_kpad_to_upad(ent_link->sink,
1651333b	167	&link.sink);
57208e5e	168	link.flags = ent_link->flags;
1651333b LP	169	if (copy_to_user(ulink, &link, sizeof(*ulink)))
	170	return -EFAULT;
	171	ulink++;
	172	}
	173	}
b0a1f2a8 SA	174
	175	return 0;
	176	}
	177
	178	static long media_device_enum_links(struct media_device *mdev,
	179	struct media_links_enum __user *ulinks)
	180	{
	181	struct media_links_enum links;
	182	int rval;
	183
	184	if (copy_from_user(&links, ulinks, sizeof(links)))
	185	return -EFAULT;
	186
	187	rval = __media_device_enum_links(mdev, &links);
	188	if (rval < 0)
	189	return rval;
	190
1651333b LP	191	if (copy_to_user(ulinks, &links, sizeof(*ulinks)))
1651333b LP	192	return -EFAULT;
b0a1f2a8	193
1651333b LP	194	return 0;
	195	}
	196
97548ed4 LP	197	static long media_device_setup_link(struct media_device *mdev,
	198	struct media_link_desc __user *_ulink)
	199	{
	200	struct media_link *link = NULL;
	201	struct media_link_desc ulink;
	202	struct media_entity *source;
	203	struct media_entity *sink;
	204	int ret;
	205
	206	if (copy_from_user(&ulink, _ulink, sizeof(ulink)))
	207	return -EFAULT;
	208
	209	/* Find the source and sink entities and link.
	210	*/
	211	source = find_entity(mdev, ulink.source.entity);
	212	sink = find_entity(mdev, ulink.sink.entity);
	213
	214	if (source == NULL \|\| sink == NULL)
	215	return -EINVAL;
	216
	217	if (ulink.source.index >= source->num_pads \|\|
	218	ulink.sink.index >= sink->num_pads)
	219	return -EINVAL;
	220
	221	link = media_entity_find_link(&source->pads[ulink.source.index],
	222	&sink->pads[ulink.sink.index]);
	223	if (link == NULL)
	224	return -EINVAL;
	225
	226	/* Setup the link on both entities. */
	227	ret = __media_entity_setup_link(link, ulink.flags);
	228
	229	if (copy_to_user(_ulink, &ulink, sizeof(ulink)))
	230	return -EFAULT;
	231
	232	return ret;
	233	}
	234
8309f47c MCC	235	static long __media_device_get_topology(struct media_device *mdev,
	236	struct media_v2_topology *topo)
	237	{
	238	struct media_entity *entity;
	239	struct media_interface *intf;
	240	struct media_pad *pad;
	241	struct media_link *link;
	242	struct media_v2_entity uentity;
	243	struct media_v2_interface uintf;
	244	struct media_v2_pad upad;
	245	struct media_v2_link ulink;
	246	int ret = 0, i;
	247
	248	topo->topology_version = mdev->topology_version;
	249
	250	/* Get entities and number of entities */
	251	i = 0;
	252	media_device_for_each_entity(entity, mdev) {
	253	i++;
	254
	255	if (ret \|\| !topo->entities)
	256	continue;
	257
	258	if (i > topo->num_entities) {
	259	ret = -ENOSPC;
	260	continue;
	261	}
	262
	263	/* Copy fields to userspace struct if not error */
	264	memset(&uentity, 0, sizeof(uentity));
	265	uentity.id = entity->graph_obj.id;
	266	strncpy(uentity.name, entity->name,
	267	sizeof(uentity.name));
	268
	269	if (copy_to_user(&topo->entities[i - 1], &uentity, sizeof(uentity)))
	270	ret = -EFAULT;
	271	}
	272	topo->num_entities = i;
	273
	274	/* Get interfaces and number of interfaces */
	275	i = 0;
	276	media_device_for_each_intf(intf, mdev) {
	277	i++;
	278
	279	if (ret \|\| !topo->interfaces)
	280	continue;
	281
	282	if (i > topo->num_interfaces) {
	283	ret = -ENOSPC;
	284	continue;
	285	}
	286
	287	memset(&uintf, 0, sizeof(uintf));
	288
	289	/* Copy intf fields to userspace struct */
	290	uintf.id = intf->graph_obj.id;
	291	uintf.intf_type = intf->type;
	292	uintf.flags = intf->flags;
	293
	294	if (media_type(&intf->graph_obj) == MEDIA_GRAPH_INTF_DEVNODE) {
	295	struct media_intf_devnode *devnode;
	296
	297	devnode = intf_to_devnode(intf);
	298
299	uintf.devnode.major = devnode->major;
300	uintf.devnode.minor = devnode->minor;
301	}
302
303	if (copy_to_user(&topo->interfaces[i - 1], &uintf, sizeof(uintf)))
304	ret = -EFAULT;
305	}
306	topo->num_interfaces = i;
307
308	/* Get pads and number of pads */
309	i = 0;
310	media_device_for_each_pad(pad, mdev) {
311	i++;
312
313	if (ret \|\| !topo->pads)
314	continue;
315
316	if (i > topo->num_pads) {
317	ret = -ENOSPC;
318	continue;
319	}
320
321	memset(&upad, 0, sizeof(upad));
322
323	/* Copy pad fields to userspace struct */
324	upad.id = pad->graph_obj.id;
325	upad.entity_id = pad->entity->graph_obj.id;
326	upad.flags = pad->flags;
327
328	if (copy_to_user(&topo->pads[i - 1], &upad, sizeof(upad)))
329	ret = -EFAULT;
330	}
331	topo->num_pads = i;
332
333	/* Get links and number of links */
334	i = 0;
335	media_device_for_each_link(link, mdev) {
336	i++;
337
338	if (ret \|\| !topo->links)
339	continue;
340
341	if (i > topo->num_links) {
342	ret = -ENOSPC;
343	continue;
344	}
345
346	memset(&ulink, 0, sizeof(ulink));
347
348	/* Copy link fields to userspace struct */
349	ulink.id = link->graph_obj.id;
350	ulink.source_id = link->gobj0->id;
351	ulink.sink_id = link->gobj1->id;
352	ulink.flags = link->flags;
353
354	if (media_type(link->gobj0) != MEDIA_GRAPH_PAD)
355	ulink.flags \|= MEDIA_LNK_FL_INTERFACE_LINK;
356
357	if (copy_to_user(&topo->links[i - 1], &ulink, sizeof(ulink)))
358	ret = -EFAULT;
359	}
360	topo->num_links = i;
361
362	return ret;
363	}
364
365	static long media_device_get_topology(struct media_device *mdev,
366	struct media_v2_topology __user *utopo)
367	{
368	struct media_v2_topology ktopo;
369	int ret;
370
371	ret = copy_from_user(&ktopo, utopo, sizeof(ktopo));
372
373	if (ret < 0)
374	return ret;
375
376	ret = __media_device_get_topology(mdev, &ktopo);
377	if (ret < 0)
378	return ret;
379
380	ret = copy_to_user(utopo, &ktopo, sizeof(*utopo));
381
382	return ret;
383	}
384
140d8816 LP	385	static long media_device_ioctl(struct file *filp, unsigned int cmd,
	386	unsigned long arg)
	387	{
	388	struct media_devnode *devnode = media_devnode_data(filp);
	389	struct media_device *dev = to_media_device(devnode);
	390	long ret;
	391
	392	switch (cmd) {
	393	case MEDIA_IOC_DEVICE_INFO:
	394	ret = media_device_get_info(dev,
	395	(struct media_device_info __user *)arg);
	396	break;
	397
1651333b LP	398	case MEDIA_IOC_ENUM_ENTITIES:
	399	ret = media_device_enum_entities(dev,
	400	(struct media_entity_desc __user *)arg);
	401	break;
	402
	403	case MEDIA_IOC_ENUM_LINKS:
	404	mutex_lock(&dev->graph_mutex);
	405	ret = media_device_enum_links(dev,
	406	(struct media_links_enum __user *)arg);
	407	mutex_unlock(&dev->graph_mutex);
	408	break;
	409
97548ed4 LP	410	case MEDIA_IOC_SETUP_LINK:
	411	mutex_lock(&dev->graph_mutex);
	412	ret = media_device_setup_link(dev,
	413	(struct media_link_desc __user *)arg);
	414	mutex_unlock(&dev->graph_mutex);
	415	break;
	416
8309f47c MCC	417	case MEDIA_IOC_G_TOPOLOGY:
	418	mutex_lock(&dev->graph_mutex);
	419	ret = media_device_get_topology(dev,
	420	(struct media_v2_topology __user *)arg);
	421	mutex_unlock(&dev->graph_mutex);
	422	break;
	423
140d8816 LP	424	default:
	425	ret = -ENOIOCTLCMD;
	426	}
	427
	428	return ret;
	429	}
	430
b0a1f2a8 SA	431	#ifdef CONFIG_COMPAT
	432
	433	struct media_links_enum32 {
	434	__u32 entity;
	435	compat_uptr_t pads; /* struct media_pad_desc * */
	436	compat_uptr_t links; /* struct media_link_desc * */
	437	__u32 reserved[4];
	438	};
	439
	440	static long media_device_enum_links32(struct media_device *mdev,
	441	struct media_links_enum32 __user *ulinks)
	442	{
	443	struct media_links_enum links;
	444	compat_uptr_t pads_ptr, links_ptr;
	445
	446	memset(&links, 0, sizeof(links));
	447
	448	if (get_user(links.entity, &ulinks->entity)
	449	\|\| get_user(pads_ptr, &ulinks->pads)
	450	\|\| get_user(links_ptr, &ulinks->links))
	451	return -EFAULT;
	452
	453	links.pads = compat_ptr(pads_ptr);
	454	links.links = compat_ptr(links_ptr);
	455
	456	return __media_device_enum_links(mdev, &links);
	457	}
	458
	459	#define MEDIA_IOC_ENUM_LINKS32 _IOWR('\|', 0x02, struct media_links_enum32)
	460
	461	static long media_device_compat_ioctl(struct file *filp, unsigned int cmd,
	462	unsigned long arg)
	463	{
	464	struct media_devnode *devnode = media_devnode_data(filp);
	465	struct media_device *dev = to_media_device(devnode);
	466	long ret;
	467
	468	switch (cmd) {
	469	case MEDIA_IOC_DEVICE_INFO:
	470	case MEDIA_IOC_ENUM_ENTITIES:
	471	case MEDIA_IOC_SETUP_LINK:
8309f47c	472	case MEDIA_IOC_G_TOPOLOGY:
b0a1f2a8 SA	473	return media_device_ioctl(filp, cmd, arg);
	474
	475	case MEDIA_IOC_ENUM_LINKS32:
	476	mutex_lock(&dev->graph_mutex);
	477	ret = media_device_enum_links32(dev,
	478	(struct media_links_enum32 __user *)arg);
	479	mutex_unlock(&dev->graph_mutex);
	480	break;
	481
	482	default:
	483	ret = -ENOIOCTLCMD;
	484	}
	485
	486	return ret;
	487	}
	488	#endif /* CONFIG_COMPAT */
	489
176fb0d1 LP	490	static const struct media_file_operations media_device_fops = {
176fb0d1 LP	491	.owner = THIS_MODULE,
140d8816 LP	492	.open = media_device_open,
140d8816 LP	493	.ioctl = media_device_ioctl,
b0a1f2a8 SA	494	#ifdef CONFIG_COMPAT
	495	.compat_ioctl = media_device_compat_ioctl,
	496	#endif /* CONFIG_COMPAT */
140d8816	497	.release = media_device_close,
176fb0d1 LP	498	};
	499
	500	/* -----------------------------------------------------------------------------
	501	* sysfs
	502	*/
	503
	504	static ssize_t show_model(struct device *cd,
	505	struct device_attribute attr, char buf)
	506	{
	507	struct media_device *mdev = to_media_device(to_media_devnode(cd));
	508
	509	return sprintf(buf, "%.*s\n", (int)sizeof(mdev->model), mdev->model);
	510	}
	511
	512	static DEVICE_ATTR(model, S_IRUGO, show_model, NULL);
	513
	514	/* -----------------------------------------------------------------------------
	515	* Registration/unregistration
	516	*/
	517
	518	static void media_device_release(struct media_devnode *mdev)
	519	{
8f5a3188	520	dev_dbg(mdev->parent, "Media device released\n");
176fb0d1 LP	521	}
	522
	523	/**
	524	* media_device_register - register a media device
	525	* @mdev: The media device
	526	*
	527	* The caller is responsible for initializing the media device before
	528	* registration. The following fields must be set:
	529	*
	530	* - dev must point to the parent device
	531	* - model must be filled with the device model name
	532	*/
85de721c SA	533	int __must_check __media_device_register(struct media_device *mdev,
85de721c SA	534	struct module *owner)
176fb0d1 LP	535	{
	536	int ret;
	537
	538	if (WARN_ON(mdev->dev == NULL \|\| mdev->model[0] == 0))
	539	return -EINVAL;
	540
53e269c1	541	INIT_LIST_HEAD(&mdev->entities);
57cf79b7	542	INIT_LIST_HEAD(&mdev->interfaces);
9155d859 MCC	543	INIT_LIST_HEAD(&mdev->pads);
9155d859 MCC	544	INIT_LIST_HEAD(&mdev->links);
53e269c1	545	spin_lock_init(&mdev->lock);
503c3d82	546	mutex_init(&mdev->graph_mutex);
53e269c1	547
176fb0d1 LP	548	/* Register the device node. */
	549	mdev->devnode.fops = &media_device_fops;
	550	mdev->devnode.parent = mdev->dev;
	551	mdev->devnode.release = media_device_release;
85de721c	552	ret = media_devnode_register(&mdev->devnode, owner);
176fb0d1 LP	553	if (ret < 0)
	554	return ret;
	555
	556	ret = device_create_file(&mdev->devnode.dev, &dev_attr_model);
	557	if (ret < 0) {
	558	media_devnode_unregister(&mdev->devnode);
	559	return ret;
	560	}
	561
8f5a3188 MCC	562	dev_dbg(mdev->dev, "Media device registered\n");
8f5a3188 MCC	563
176fb0d1 LP	564	return 0;
176fb0d1 LP	565	}
85de721c	566	EXPORT_SYMBOL_GPL(__media_device_register);
176fb0d1 LP	567
	568	/**
	569	* media_device_unregister - unregister a media device
	570	* @mdev: The media device
	571	*
	572	*/
	573	void media_device_unregister(struct media_device *mdev)
	574	{
53e269c1 LP	575	struct media_entity *entity;
	576	struct media_entity *next;
	577
05bfa9fa	578	list_for_each_entry_safe(entity, next, &mdev->entities, graph_obj.list)
53e269c1 LP	579	media_device_unregister_entity(entity);
53e269c1 LP	580
176fb0d1 LP	581	device_remove_file(&mdev->devnode.dev, &dev_attr_model);
176fb0d1 LP	582	media_devnode_unregister(&mdev->devnode);
8f5a3188 MCC	583
8f5a3188 MCC	584	dev_dbg(mdev->dev, "Media device unregistered\n");
176fb0d1 LP	585	}
176fb0d1 LP	586	EXPORT_SYMBOL_GPL(media_device_unregister);
53e269c1 LP	587
	588	/**
	589	* media_device_register_entity - Register an entity with a media device
	590	* @mdev: The media device
	591	* @entity: The entity
	592	*/
	593	int __must_check media_device_register_entity(struct media_device *mdev,
	594	struct media_entity *entity)
	595	{
18710dc6 MCC	596	int i;
18710dc6 MCC	597
b50bde4e MCC	598	if (entity->type == MEDIA_ENT_T_V4L2_SUBDEV_UNKNOWN \|\|
	599	entity->type == MEDIA_ENT_T_UNKNOWN)
	600	dev_warn(mdev->dev,
	601	"Entity type for entity %s was not initialized!\n",
	602	entity->name);
	603
53e269c1	604	/* Warn if we apparently re-register an entity */
d10c9894 JMC	605	WARN_ON(entity->graph_obj.mdev != NULL);
d10c9894 JMC	606	entity->graph_obj.mdev = mdev;
57208e5e	607	INIT_LIST_HEAD(&entity->links);
53e269c1 LP	608
53e269c1 LP	609	spin_lock(&mdev->lock);
bfab2aac MCC	610	/* Initialize media_gobj embedded at the entity */
bfab2aac MCC	611	media_gobj_init(mdev, MEDIA_GRAPH_ENTITY, &entity->graph_obj);
18710dc6 MCC	612
	613	/* Initialize objects at the pads */
	614	for (i = 0; i < entity->num_pads; i++)
	615	media_gobj_init(mdev, MEDIA_GRAPH_PAD,
	616	&entity->pads[i].graph_obj);
	617
53e269c1 LP	618	spin_unlock(&mdev->lock);
	619
	620	return 0;
	621	}
	622	EXPORT_SYMBOL_GPL(media_device_register_entity);
	623
	624	/**
	625	* media_device_unregister_entity - Unregister an entity
	626	* @entity: The entity
	627	*
	628	* If the entity has never been registered this function will return
	629	* immediately.
	630	*/
	631	void media_device_unregister_entity(struct media_entity *entity)
	632	{
18710dc6	633	int i;
d10c9894	634	struct media_device *mdev = entity->graph_obj.mdev;
57208e5e	635	struct media_link link, tmp;
53e269c1 LP	636
	637	if (mdev == NULL)
	638	return;
	639
	640	spin_lock(&mdev->lock);
a28971ad MCC	641
	642	/* Remove interface links with this entity on it */
	643	list_for_each_entry_safe(link, tmp, &mdev->links, graph_obj.list) {
	644	if (media_type(link->gobj1) == MEDIA_GRAPH_ENTITY
	645	&& link->entity == entity) {
	646	media_gobj_remove(&link->graph_obj);
	647	kfree(link);
	648	}
	649	}
	650
	651	/* Remove all data links that belong to this entity */
57208e5e MCC	652	list_for_each_entry_safe(link, tmp, &entity->links, list) {
	653	media_gobj_remove(&link->graph_obj);
	654	list_del(&link->list);
	655	kfree(link);
	656	}
a28971ad MCC	657
a28971ad MCC	658	/* Remove all pads that belong to this entity */
18710dc6 MCC	659	for (i = 0; i < entity->num_pads; i++)
18710dc6 MCC	660	media_gobj_remove(&entity->pads[i].graph_obj);
a28971ad MCC	661
a28971ad MCC	662	/* Remove the entity */
bfab2aac	663	media_gobj_remove(&entity->graph_obj);
a28971ad	664
53e269c1	665	spin_unlock(&mdev->lock);
d10c9894	666	entity->graph_obj.mdev = NULL;
53e269c1 LP	667	}
53e269c1 LP	668	EXPORT_SYMBOL_GPL(media_device_unregister_entity);
d062f911 SK	669
	670	static void media_device_release_devres(struct device dev, void res)
	671	{
	672	}
	673
	674	/*
	675	* media_device_get_devres() - get media device as device resource
	676	* creates if one doesn't exist
	677	*/
	678	struct media_device media_device_get_devres(struct device dev)
	679	{
	680	struct media_device *mdev;
	681
	682	mdev = devres_find(dev, media_device_release_devres, NULL, NULL);
	683	if (mdev)
	684	return mdev;
	685
	686	mdev = devres_alloc(media_device_release_devres,
	687	sizeof(struct media_device), GFP_KERNEL);
	688	if (!mdev)
	689	return NULL;
	690	return devres_get(dev, mdev, NULL, NULL);
	691	}
	692	EXPORT_SYMBOL_GPL(media_device_get_devres);
	693
	694	/*
	695	* media_device_find_devres() - find media device as device resource
	696	*/
	697	struct media_device media_device_find_devres(struct device dev)
	698	{
	699	return devres_find(dev, media_device_release_devres, NULL, NULL);
	700	}
	701	EXPORT_SYMBOL_GPL(media_device_find_devres);
e576d60b SK	702
e576d60b SK	703	#endif /* CONFIG_MEDIA_CONTROLLER */