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Diffstat (limited to 'include/media/media-device.h')
| -rw-r--r-- | include/media/media-device.h | 103 |
1 files changed, 103 insertions, 0 deletions
diff --git a/include/media/media-device.h b/include/media/media-device.h new file mode 100644 index 000000000..6e6db78f1 --- /dev/null +++ b/include/media/media-device.h @@ -0,0 +1,103 @@ +/* + * 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 + */ + +#ifndef _MEDIA_DEVICE_H +#define _MEDIA_DEVICE_H + +#include <linux/list.h> +#include <linux/mutex.h> +#include <linux/spinlock.h> + +#include <media/media-devnode.h> +#include <media/media-entity.h> + +struct device; + +/** + * struct media_device - Media device + * @dev: Parent device + * @devnode: Media device node + * @model: Device model name + * @serial: Device serial number (optional) + * @bus_info: Unique and stable device location identifier + * @hw_revision: Hardware device revision + * @driver_version: Device driver version + * @entity_id: ID of the next entity to be registered + * @entities: List of registered entities + * @lock: Entities list lock + * @graph_mutex: Entities graph operation lock + * @link_notify: Link state change notification callback + * + * This structure represents an abstract high-level media device. It allows easy + * access to entities and provides basic media device-level support. The + * structure can be allocated directly or embedded in a larger structure. + * + * The parent @dev is a physical device. It must be set before registering the + * media device. + * + * @model is a descriptive model name exported through sysfs. It doesn't have to + * be unique. + */ +struct media_device { + /* dev->driver_data points to this struct. */ + struct device *dev; + struct media_devnode devnode; + + char model[32]; + char serial[40]; + char bus_info[32]; + u32 hw_revision; + u32 driver_version; + + u32 entity_id; + struct list_head entities; + + /* Protects the entities list */ + spinlock_t lock; + /* Serializes graph operations. */ + struct mutex graph_mutex; + + int (*link_notify)(struct media_link *link, u32 flags, + unsigned int notification); +}; + +/* Supported link_notify @notification values. */ +#define MEDIA_DEV_NOTIFY_PRE_LINK_CH 0 +#define MEDIA_DEV_NOTIFY_POST_LINK_CH 1 + +/* media_devnode to media_device */ +#define to_media_device(node) container_of(node, struct media_device, devnode) + +int __must_check __media_device_register(struct media_device *mdev, + struct module *owner); +#define media_device_register(mdev) __media_device_register(mdev, THIS_MODULE) +void media_device_unregister(struct media_device *mdev); + +int __must_check media_device_register_entity(struct media_device *mdev, + struct media_entity *entity); +void media_device_unregister_entity(struct media_entity *entity); + +/* Iterate over all entities. */ +#define media_device_for_each_entity(entity, mdev) \ + list_for_each_entry(entity, &(mdev)->entities, list) + +#endif |