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 23 #ifndef _MEDIA_DEVICE_H 24 #define _MEDIA_DEVICE_H 25 26 #include <linux/list.h> 27 #include <linux/mutex.h> 28 #include <linux/spinlock.h> 29 30 #include <media/media-devnode.h> 31 #include <media/media-entity.h> 32 33 struct device; 34 35 /** 36 * struct media_device - Media device 37 * @dev: Parent device 38 * @devnode: Media device node 39 * @model: Device model name 40 * @serial: Device serial number (optional) 41 * @bus_info: Unique and stable device location identifier 42 * @hw_revision: Hardware device revision 43 * @driver_version: Device driver version 44 * @entity_id: ID of the next entity to be registered 45 * @entities: List of registered entities 46 * @lock: Entities list lock 47 * @graph_mutex: Entities graph operation lock 48 * @link_notify: Link state change notification callback 49 * 50 * This structure represents an abstract high-level media device. It allows easy 51 * access to entities and provides basic media device-level support. The 52 * structure can be allocated directly or embedded in a larger structure. 53 * 54 * The parent @dev is a physical device. It must be set before registering the 55 * media device. 56 * 57 * @model is a descriptive model name exported through sysfs. It doesn't have to 58 * be unique. 59 */ 60 struct media_device { 61 /* dev->driver_data points to this struct. */ 62 struct device *dev; 63 struct media_devnode devnode; 64 65 char model[32]; 66 char serial[40]; 67 char bus_info[32]; 68 u32 hw_revision; 69 u32 driver_version; 70 71 u32 entity_id; 72 struct list_head entities; 73 74 /* Protects the entities list */ 75 spinlock_t lock; 76 /* Serializes graph operations. */ 77 struct mutex graph_mutex; 78 79 int (*link_notify)(struct media_link *link, u32 flags, 80 unsigned int notification); 81 }; 82 83 /* Supported link_notify @notification values. */ 84 #define MEDIA_DEV_NOTIFY_PRE_LINK_CH 0 85 #define MEDIA_DEV_NOTIFY_POST_LINK_CH 1 86 87 /* media_devnode to media_device */ 88 #define to_media_device(node) container_of(node, struct media_device, devnode) 89 90 int __must_check __media_device_register(struct media_device *mdev, 91 struct module *owner); 92 #define media_device_register(mdev) __media_device_register(mdev, THIS_MODULE) 93 void media_device_unregister(struct media_device *mdev); 94 95 int __must_check media_device_register_entity(struct media_device *mdev, 96 struct media_entity *entity); 97 void media_device_unregister_entity(struct media_entity *entity); 98 99 /* Iterate over all entities. */ 100 #define media_device_for_each_entity(entity, mdev) \ 101 list_for_each_entry(entity, &(mdev)->entities, list) 102 103 #endif 104