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The MC next gen API sends objects to userspace grouped by their types. In the case of pads and links, in order to improve performance and have a simpler code, the best is to store them also on separate linked lists at MC. If we don't do that, we would need this kind of interaction to send data to userspace (code is in structured english): for each entity: for each pad: store pads for each entity: for each link: store link for each interface: for each link: store link With would require one nested loop for pads and two nested loops for links. By using separate linked lists for them, just one loop would be enough. Acked-by: Hans Verkuil <hans.verkuil@cisco.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
158 lines
4.8 KiB
C
158 lines
4.8 KiB
C
/*
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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: Unique ID used on the last entity registered
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* @pad_id: Unique ID used on the last pad registered
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* @link_id: Unique ID used on the last link registered
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* @intf_devnode_id: Unique ID used on the last interface devnode registered
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* @entities: List of registered entities
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* @interfaces: List of registered interfaces
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* @pads: List of registered pads
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* @links: List of registered links
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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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u32 pad_id;
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u32 link_id;
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u32 intf_devnode_id;
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struct list_head entities;
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struct list_head interfaces;
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struct list_head pads;
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struct list_head links;
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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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#ifdef CONFIG_MEDIA_CONTROLLER
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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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struct media_device *media_device_get_devres(struct device *dev);
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struct media_device *media_device_find_devres(struct device *dev);
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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, graph_obj.list)
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/* Iterate over all interfaces. */
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#define media_device_for_each_intf(intf, mdev) \
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list_for_each_entry(intf, &(mdev)->interfaces, graph_obj.list)
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/* Iterate over all pads. */
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#define media_device_for_each_pad(pad, mdev) \
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list_for_each_entry(pad, &(mdev)->pads, graph_obj.list)
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/* Iterate over all links. */
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#define media_device_for_each_link(link, mdev) \
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list_for_each_entry(link, &(mdev)->links, graph_obj.list)
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#else
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static inline int media_device_register(struct media_device *mdev)
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{
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return 0;
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}
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static inline void media_device_unregister(struct media_device *mdev)
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{
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}
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static inline int media_device_register_entity(struct media_device *mdev,
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struct media_entity *entity)
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{
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return 0;
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}
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static inline void media_device_unregister_entity(struct media_entity *entity)
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{
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}
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static inline struct media_device *media_device_get_devres(struct device *dev)
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{
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return NULL;
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}
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static inline struct media_device *media_device_find_devres(struct device *dev)
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{
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return NULL;
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}
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#endif /* CONFIG_MEDIA_CONTROLLER */
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#endif
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