[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) {
		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)
{
	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;
	struct media_interface *intf;

	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>
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) {
39d1ebc6 MCC	336	if (link->is_backlink)
	337	continue;
	338
8309f47c MCC	339	i++;
	340
	341	if (ret \|\| !topo->links)
	342	continue;
	343
	344	if (i > topo->num_links) {
	345	ret = -ENOSPC;
	346	continue;
	347	}
	348
	349	memset(&ulink, 0, sizeof(ulink));
	350
	351	/* Copy link fields to userspace struct */
	352	ulink.id = link->graph_obj.id;
	353	ulink.source_id = link->gobj0->id;
	354	ulink.sink_id = link->gobj1->id;
	355	ulink.flags = link->flags;
	356
	357	if (media_type(link->gobj0) != MEDIA_GRAPH_PAD)
	358	ulink.flags \|= MEDIA_LNK_FL_INTERFACE_LINK;
	359
	360	if (copy_to_user(&topo->links[i - 1], &ulink, sizeof(ulink)))
	361	ret = -EFAULT;
	362	}
	363	topo->num_links = i;
	364
	365	return ret;
	366	}
	367
	368	static long media_device_get_topology(struct media_device *mdev,
	369	struct media_v2_topology __user *utopo)
	370	{
	371	struct media_v2_topology ktopo;
	372	int ret;
	373
	374	ret = copy_from_user(&ktopo, utopo, sizeof(ktopo));
	375
	376	if (ret < 0)
	377	return ret;
	378
	379	ret = __media_device_get_topology(mdev, &ktopo);
	380	if (ret < 0)
	381	return ret;
	382
	383	ret = copy_to_user(utopo, &ktopo, sizeof(*utopo));
	384
	385	return ret;
	386	}
	387
140d8816 LP	388	static long media_device_ioctl(struct file *filp, unsigned int cmd,
	389	unsigned long arg)
	390	{
	391	struct media_devnode *devnode = media_devnode_data(filp);
	392	struct media_device *dev = to_media_device(devnode);
	393	long ret;
	394
	395	switch (cmd) {
	396	case MEDIA_IOC_DEVICE_INFO:
	397	ret = media_device_get_info(dev,
	398	(struct media_device_info __user *)arg);
	399	break;
	400
1651333b LP	401	case MEDIA_IOC_ENUM_ENTITIES:
	402	ret = media_device_enum_entities(dev,
	403	(struct media_entity_desc __user *)arg);
	404	break;
	405
	406	case MEDIA_IOC_ENUM_LINKS:
	407	mutex_lock(&dev->graph_mutex);
	408	ret = media_device_enum_links(dev,
	409	(struct media_links_enum __user *)arg);
	410	mutex_unlock(&dev->graph_mutex);
	411	break;
	412
97548ed4 LP	413	case MEDIA_IOC_SETUP_LINK:
	414	mutex_lock(&dev->graph_mutex);
	415	ret = media_device_setup_link(dev,
	416	(struct media_link_desc __user *)arg);
	417	mutex_unlock(&dev->graph_mutex);
	418	break;
	419
8309f47c MCC	420	case MEDIA_IOC_G_TOPOLOGY:
	421	mutex_lock(&dev->graph_mutex);
	422	ret = media_device_get_topology(dev,
	423	(struct media_v2_topology __user *)arg);
	424	mutex_unlock(&dev->graph_mutex);
	425	break;
	426
140d8816 LP	427	default:
	428	ret = -ENOIOCTLCMD;
	429	}
	430
	431	return ret;
	432	}
	433
b0a1f2a8 SA	434	#ifdef CONFIG_COMPAT
	435
	436	struct media_links_enum32 {
	437	__u32 entity;
	438	compat_uptr_t pads; /* struct media_pad_desc * */
	439	compat_uptr_t links; /* struct media_link_desc * */
	440	__u32 reserved[4];
	441	};
	442
	443	static long media_device_enum_links32(struct media_device *mdev,
	444	struct media_links_enum32 __user *ulinks)
	445	{
	446	struct media_links_enum links;
	447	compat_uptr_t pads_ptr, links_ptr;
	448
	449	memset(&links, 0, sizeof(links));
	450
	451	if (get_user(links.entity, &ulinks->entity)
	452	\|\| get_user(pads_ptr, &ulinks->pads)
	453	\|\| get_user(links_ptr, &ulinks->links))
	454	return -EFAULT;
	455
	456	links.pads = compat_ptr(pads_ptr);
	457	links.links = compat_ptr(links_ptr);
	458
	459	return __media_device_enum_links(mdev, &links);
	460	}
	461
	462	#define MEDIA_IOC_ENUM_LINKS32 _IOWR('\|', 0x02, struct media_links_enum32)
	463
	464	static long media_device_compat_ioctl(struct file *filp, unsigned int cmd,
	465	unsigned long arg)
	466	{
	467	struct media_devnode *devnode = media_devnode_data(filp);
	468	struct media_device *dev = to_media_device(devnode);
	469	long ret;
	470
	471	switch (cmd) {
	472	case MEDIA_IOC_DEVICE_INFO:
	473	case MEDIA_IOC_ENUM_ENTITIES:
	474	case MEDIA_IOC_SETUP_LINK:
8309f47c	475	case MEDIA_IOC_G_TOPOLOGY:
b0a1f2a8 SA	476	return media_device_ioctl(filp, cmd, arg);
	477
	478	case MEDIA_IOC_ENUM_LINKS32:
	479	mutex_lock(&dev->graph_mutex);
	480	ret = media_device_enum_links32(dev,
	481	(struct media_links_enum32 __user *)arg);
	482	mutex_unlock(&dev->graph_mutex);
	483	break;
	484
	485	default:
	486	ret = -ENOIOCTLCMD;
	487	}
	488
	489	return ret;
	490	}
	491	#endif /* CONFIG_COMPAT */
	492
176fb0d1 LP	493	static const struct media_file_operations media_device_fops = {
176fb0d1 LP	494	.owner = THIS_MODULE,
140d8816 LP	495	.open = media_device_open,
140d8816 LP	496	.ioctl = media_device_ioctl,
b0a1f2a8 SA	497	#ifdef CONFIG_COMPAT
	498	.compat_ioctl = media_device_compat_ioctl,
	499	#endif /* CONFIG_COMPAT */
140d8816	500	.release = media_device_close,
176fb0d1 LP	501	};
	502
	503	/* -----------------------------------------------------------------------------
	504	* sysfs
	505	*/
	506
	507	static ssize_t show_model(struct device *cd,
	508	struct device_attribute attr, char buf)
	509	{
	510	struct media_device *mdev = to_media_device(to_media_devnode(cd));
	511
	512	return sprintf(buf, "%.*s\n", (int)sizeof(mdev->model), mdev->model);
	513	}
	514
	515	static DEVICE_ATTR(model, S_IRUGO, show_model, NULL);
	516
	517	/* -----------------------------------------------------------------------------
	518	* Registration/unregistration
	519	*/
	520
	521	static void media_device_release(struct media_devnode *mdev)
	522	{
8f5a3188	523	dev_dbg(mdev->parent, "Media device released\n");
176fb0d1 LP	524	}
	525
	526	/**
	527	* media_device_register - register a media device
	528	* @mdev: The media device
	529	*
	530	* The caller is responsible for initializing the media device before
	531	* registration. The following fields must be set:
	532	*
	533	* - dev must point to the parent device
	534	* - model must be filled with the device model name
	535	*/
85de721c SA	536	int __must_check __media_device_register(struct media_device *mdev,
85de721c SA	537	struct module *owner)
176fb0d1 LP	538	{
	539	int ret;
	540
	541	if (WARN_ON(mdev->dev == NULL \|\| mdev->model[0] == 0))
	542	return -EINVAL;
	543
53e269c1	544	INIT_LIST_HEAD(&mdev->entities);
57cf79b7	545	INIT_LIST_HEAD(&mdev->interfaces);
9155d859 MCC	546	INIT_LIST_HEAD(&mdev->pads);
9155d859 MCC	547	INIT_LIST_HEAD(&mdev->links);
53e269c1	548	spin_lock_init(&mdev->lock);
503c3d82	549	mutex_init(&mdev->graph_mutex);
53e269c1	550
176fb0d1 LP	551	/* Register the device node. */
	552	mdev->devnode.fops = &media_device_fops;
	553	mdev->devnode.parent = mdev->dev;
	554	mdev->devnode.release = media_device_release;
85de721c	555	ret = media_devnode_register(&mdev->devnode, owner);
176fb0d1 LP	556	if (ret < 0)
	557	return ret;
	558
	559	ret = device_create_file(&mdev->devnode.dev, &dev_attr_model);
	560	if (ret < 0) {
	561	media_devnode_unregister(&mdev->devnode);
	562	return ret;
	563	}
	564
8f5a3188 MCC	565	dev_dbg(mdev->dev, "Media device registered\n");
8f5a3188 MCC	566
176fb0d1 LP	567	return 0;
176fb0d1 LP	568	}
85de721c	569	EXPORT_SYMBOL_GPL(__media_device_register);
176fb0d1 LP	570
	571	/**
	572	* media_device_unregister - unregister a media device
	573	* @mdev: The media device
	574	*
	575	*/
	576	void media_device_unregister(struct media_device *mdev)
	577	{
53e269c1 LP	578	struct media_entity *entity;
53e269c1 LP	579	struct media_entity *next;
d47109fa MCC	580	struct media_interface intf, tmp_intf;
d47109fa MCC	581
f50d5166 MCC	582	/* Remove all entities from the media device */
	583	list_for_each_entry_safe(entity, next, &mdev->entities, graph_obj.list)
	584	media_device_unregister_entity(entity);
	585
d47109fa MCC	586	/* Remove all interfaces from the media device */
	587	spin_lock(&mdev->lock);
	588	list_for_each_entry_safe(intf, tmp_intf, &mdev->interfaces,
	589	graph_obj.list) {
	590	__media_remove_intf_links(intf);
	591	media_gobj_remove(&intf->graph_obj);
	592	kfree(intf);
	593	}
	594	spin_unlock(&mdev->lock);
53e269c1	595
176fb0d1 LP	596	device_remove_file(&mdev->devnode.dev, &dev_attr_model);
176fb0d1 LP	597	media_devnode_unregister(&mdev->devnode);
8f5a3188 MCC	598
8f5a3188 MCC	599	dev_dbg(mdev->dev, "Media device unregistered\n");
176fb0d1 LP	600	}
176fb0d1 LP	601	EXPORT_SYMBOL_GPL(media_device_unregister);
53e269c1 LP	602
	603	/**
	604	* media_device_register_entity - Register an entity with a media device
	605	* @mdev: The media device
	606	* @entity: The entity
	607	*/
	608	int __must_check media_device_register_entity(struct media_device *mdev,
	609	struct media_entity *entity)
	610	{
18710dc6 MCC	611	int i;
18710dc6 MCC	612
b50bde4e MCC	613	if (entity->type == MEDIA_ENT_T_V4L2_SUBDEV_UNKNOWN \|\|
	614	entity->type == MEDIA_ENT_T_UNKNOWN)
	615	dev_warn(mdev->dev,
	616	"Entity type for entity %s was not initialized!\n",
	617	entity->name);
	618
53e269c1	619	/* Warn if we apparently re-register an entity */
d10c9894 JMC	620	WARN_ON(entity->graph_obj.mdev != NULL);
d10c9894 JMC	621	entity->graph_obj.mdev = mdev;
57208e5e	622	INIT_LIST_HEAD(&entity->links);
53e269c1 LP	623
53e269c1 LP	624	spin_lock(&mdev->lock);
bfab2aac MCC	625	/* Initialize media_gobj embedded at the entity */
bfab2aac MCC	626	media_gobj_init(mdev, MEDIA_GRAPH_ENTITY, &entity->graph_obj);
18710dc6 MCC	627
	628	/* Initialize objects at the pads */
	629	for (i = 0; i < entity->num_pads; i++)
	630	media_gobj_init(mdev, MEDIA_GRAPH_PAD,
	631	&entity->pads[i].graph_obj);
	632
53e269c1 LP	633	spin_unlock(&mdev->lock);
	634
	635	return 0;
	636	}
	637	EXPORT_SYMBOL_GPL(media_device_register_entity);
	638
	639	/**
	640	* media_device_unregister_entity - Unregister an entity
	641	* @entity: The entity
	642	*
	643	* If the entity has never been registered this function will return
	644	* immediately.
	645	*/
	646	void media_device_unregister_entity(struct media_entity *entity)
	647	{
18710dc6	648	int i;
d10c9894	649	struct media_device *mdev = entity->graph_obj.mdev;
57208e5e	650	struct media_link link, tmp;
d47109fa	651	struct media_interface *intf;
53e269c1 LP	652
	653	if (mdev == NULL)
	654	return;
	655
	656	spin_lock(&mdev->lock);
a28971ad	657
d47109fa MCC	658	/* Remove all interface links pointing to this entity */
	659	list_for_each_entry(intf, &mdev->interfaces, graph_obj.list) {
	660	list_for_each_entry_safe(link, tmp, &intf->links, list) {
f50d5166	661	if (link->entity == entity)
d47109fa	662	__media_remove_intf_link(link);
a28971ad MCC	663	}
	664	}
	665
	666	/* Remove all data links that belong to this entity */
d47109fa	667	__media_entity_remove_links(entity);
a28971ad MCC	668
a28971ad MCC	669	/* Remove all pads that belong to this entity */
18710dc6 MCC	670	for (i = 0; i < entity->num_pads; i++)
18710dc6 MCC	671	media_gobj_remove(&entity->pads[i].graph_obj);
a28971ad MCC	672
a28971ad MCC	673	/* Remove the entity */
bfab2aac	674	media_gobj_remove(&entity->graph_obj);
a28971ad	675
53e269c1	676	spin_unlock(&mdev->lock);
d10c9894	677	entity->graph_obj.mdev = NULL;
53e269c1 LP	678	}
53e269c1 LP	679	EXPORT_SYMBOL_GPL(media_device_unregister_entity);
d062f911 SK	680
	681	static void media_device_release_devres(struct device dev, void res)
	682	{
	683	}
	684
	685	/*
	686	* media_device_get_devres() - get media device as device resource
	687	* creates if one doesn't exist
	688	*/
	689	struct media_device media_device_get_devres(struct device dev)
	690	{
	691	struct media_device *mdev;
	692
	693	mdev = devres_find(dev, media_device_release_devres, NULL, NULL);
	694	if (mdev)
	695	return mdev;
	696
	697	mdev = devres_alloc(media_device_release_devres,
	698	sizeof(struct media_device), GFP_KERNEL);
	699	if (!mdev)
	700	return NULL;
	701	return devres_get(dev, mdev, NULL, NULL);
	702	}
	703	EXPORT_SYMBOL_GPL(media_device_get_devres);
	704
	705	/*
	706	* media_device_find_devres() - find media device as device resource
	707	*/
	708	struct media_device media_device_find_devres(struct device dev)
	709	{
	710	return devres_find(dev, media_device_release_devres, NULL, NULL);
	711	}
	712	EXPORT_SYMBOL_GPL(media_device_find_devres);
e576d60b SK	713
e576d60b SK	714	#endif /* CONFIG_MEDIA_CONTROLLER */