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103 lines
3.2 KiB
103 lines
3.2 KiB
/* |
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* Media device |
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* |
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* Copyright (C) 2010 Nokia Corporation |
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* |
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* Contacts: Laurent Pinchart <laurent.pinchart@ideasonboard.com> |
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* Sakari Ailus <sakari.ailus@iki.fi> |
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* |
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* This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License version 2 as |
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* published by the Free Software Foundation. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program; if not, write to the Free Software |
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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*/ |
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#ifndef _MEDIA_DEVICE_H |
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#define _MEDIA_DEVICE_H |
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#include <linux/list.h> |
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#include <linux/mutex.h> |
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#include <linux/spinlock.h> |
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#include <media/media-devnode.h> |
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#include <media/media-entity.h> |
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struct device; |
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/** |
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* struct media_device - Media device |
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* @dev: Parent device |
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* @devnode: Media device node |
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* @model: Device model name |
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* @serial: Device serial number (optional) |
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* @bus_info: Unique and stable device location identifier |
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* @hw_revision: Hardware device revision |
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* @driver_version: Device driver version |
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* @entity_id: ID of the next entity to be registered |
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* @entities: List of registered entities |
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* @lock: Entities list lock |
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* @graph_mutex: Entities graph operation lock |
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* @link_notify: Link state change notification callback |
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* |
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* This structure represents an abstract high-level media device. It allows easy |
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* access to entities and provides basic media device-level support. The |
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* structure can be allocated directly or embedded in a larger structure. |
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* |
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* The parent @dev is a physical device. It must be set before registering the |
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* media device. |
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* |
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* @model is a descriptive model name exported through sysfs. It doesn't have to |
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* be unique. |
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*/ |
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struct media_device { |
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/* dev->driver_data points to this struct. */ |
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struct device *dev; |
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struct media_devnode devnode; |
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char model[32]; |
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char serial[40]; |
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char bus_info[32]; |
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u32 hw_revision; |
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u32 driver_version; |
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u32 entity_id; |
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struct list_head entities; |
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/* Protects the entities list */ |
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spinlock_t lock; |
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/* Serializes graph operations. */ |
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struct mutex graph_mutex; |
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int (*link_notify)(struct media_link *link, u32 flags, |
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unsigned int notification); |
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}; |
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/* Supported link_notify @notification values. */ |
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#define MEDIA_DEV_NOTIFY_PRE_LINK_CH 0 |
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#define MEDIA_DEV_NOTIFY_POST_LINK_CH 1 |
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/* media_devnode to media_device */ |
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#define to_media_device(node) container_of(node, struct media_device, devnode) |
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int __must_check __media_device_register(struct media_device *mdev, |
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struct module *owner); |
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#define media_device_register(mdev) __media_device_register(mdev, THIS_MODULE) |
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void media_device_unregister(struct media_device *mdev); |
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int __must_check media_device_register_entity(struct media_device *mdev, |
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struct media_entity *entity); |
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void media_device_unregister_entity(struct media_entity *entity); |
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/* Iterate over all entities. */ |
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#define media_device_for_each_entity(entity, mdev) \ |
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list_for_each_entry(entity, &(mdev)->entities, list) |
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#endif
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