479 lines
16 KiB
C
479 lines
16 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 <media/media-devnode.h>
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#include <media/media-entity.h>
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struct ida;
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struct device;
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/**
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* struct media_entity_notify - Media Entity Notify
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*
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* @list: List head
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* @notify_data: Input data to invoke the callback
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* @notify: Callback function pointer
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*
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* Drivers may register a callback to take action when
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* new entities get registered with the media device.
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*/
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struct media_entity_notify {
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struct list_head list;
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void *notify_data;
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void (*notify)(struct media_entity *entity, void *notify_data);
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};
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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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* @driver_name: Optional device driver name. If not set, calls to
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* %MEDIA_IOC_DEVICE_INFO will return dev->driver->name.
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* This is needed for USB drivers for example, as otherwise
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* they'll all appear as if the driver name was "usb".
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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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* @topology_version: Monotonic counter for storing the version of the graph
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* topology. Should be incremented each time the topology changes.
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* @id: Unique ID used on the last registered graph object
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* @entity_internal_idx: Unique internal entity ID used by the graph traversal
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* algorithms
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* @entity_internal_idx_max: Allocated internal entity indices
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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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* @entity_notify: List of registered entity_notify callbacks
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* @graph_mutex: Protects access to struct media_device data
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* @pm_count_walk: Graph walk for power state walk. Access serialised using
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* graph_mutex.
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*
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* @source_priv: Driver Private data for enable/disable source handlers
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* @enable_source: Enable Source Handler function pointer
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* @disable_source: Disable Source Handler function pointer
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*
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* @link_notify: Link state change notification callback. This callback is
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* called with the graph_mutex held.
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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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* @enable_source is a handler to find source entity for the
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* sink entity and activate the link between them if source
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* entity is free. Drivers should call this handler before
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* accessing the source.
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*
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* @disable_source is a handler to find source entity for the
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* sink entity and deactivate the link between them. Drivers
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* should call this handler to release the source.
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*
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* Note: Bridge driver is expected to implement and set the
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* handler when media_device is registered or when
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* bridge driver finds the media_device during probe.
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* Bridge driver sets source_priv with information
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* necessary to run enable/disable source handlers.
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*
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* Use-case: find tuner entity connected to the decoder
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* entity and check if it is available, and activate the
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* the link between them from enable_source and deactivate
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* from disable_source.
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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 driver_name[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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u64 topology_version;
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u32 id;
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struct ida entity_internal_idx;
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int entity_internal_idx_max;
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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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/* notify callback list invoked when a new entity is registered */
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struct list_head entity_notify;
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/* Serializes graph operations. */
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struct mutex graph_mutex;
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struct media_entity_graph pm_count_walk;
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void *source_priv;
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int (*enable_source)(struct media_entity *entity,
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struct media_pipeline *pipe);
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void (*disable_source)(struct media_entity *entity);
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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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/* We don't need to include pci.h or usb.h here */
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struct pci_dev;
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struct usb_device;
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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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/**
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* media_entity_enum_init - Initialise an entity enumeration
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*
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* @ent_enum: Entity enumeration to be initialised
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* @mdev: The related media device
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*
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* Returns zero on success or a negative error code.
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*/
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static inline __must_check int media_entity_enum_init(
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struct media_entity_enum *ent_enum, struct media_device *mdev)
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{
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return __media_entity_enum_init(ent_enum,
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mdev->entity_internal_idx_max + 1);
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}
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/**
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* media_device_init() - Initializes a media device element
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*
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* @mdev: pointer to struct &media_device
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*
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* This function initializes the media device prior to its registration.
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* The media device initialization and registration is split in two functions
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* to avoid race conditions and make the media device available to user-space
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* before the media graph has been completed.
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*
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* So drivers need to first initialize the media device, register any entity
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* within the media device, create pad to pad links and then finally register
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* the media device by calling media_device_register() as a final step.
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*/
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void media_device_init(struct media_device *mdev);
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/**
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* media_device_cleanup() - Cleanups a media device element
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*
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* @mdev: pointer to struct &media_device
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*
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* This function that will destroy the graph_mutex that is
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* initialized in media_device_init().
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*/
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void media_device_cleanup(struct media_device *mdev);
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/**
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* __media_device_register() - Registers a media device element
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*
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* @mdev: pointer to struct &media_device
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* @owner: should be filled with %THIS_MODULE
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*
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* Users, should, instead, call the media_device_register() macro.
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*
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* The caller is responsible for initializing the media_device structure before
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* registration. The following fields must be set:
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*
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* - dev must point to the parent device (usually a &pci_dev, &usb_interface or
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* &platform_device instance).
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*
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* - model must be filled with the device model name as a NUL-terminated UTF-8
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* string. The device/model revision must not be stored in this field.
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*
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* The following fields are optional:
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*
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* - serial is a unique serial number stored as a NUL-terminated ASCII string.
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* The field is big enough to store a GUID in text form. If the hardware
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* doesn't provide a unique serial number this field must be left empty.
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*
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* - bus_info represents the location of the device in the system as a
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* NUL-terminated ASCII string. For PCI/PCIe devices bus_info must be set to
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* "PCI:" (or "PCIe:") followed by the value of pci_name(). For USB devices,
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* the usb_make_path() function must be used. This field is used by
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* applications to distinguish between otherwise identical devices that don't
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* provide a serial number.
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*
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* - hw_revision is the hardware device revision in a driver-specific format.
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* When possible the revision should be formatted with the KERNEL_VERSION
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* macro.
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*
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* - driver_version is formatted with the KERNEL_VERSION macro. The version
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* minor must be incremented when new features are added to the userspace API
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* without breaking binary compatibility. The version major must be
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* incremented when binary compatibility is broken.
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*
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* .. note::
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*
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* #) Upon successful registration a character device named media[0-9]+ is created. The device major and minor numbers are dynamic. The model name is exported as a sysfs attribute.
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*
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* #) Unregistering a media device that hasn't been registered is **NOT** safe.
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*
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* Return: returns zero on success or a negative error code.
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*/
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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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/**
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* media_device_unregister() - Unregisters a media device element
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*
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* @mdev: pointer to struct &media_device
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*
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*
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* It is safe to call this function on an unregistered (but initialised)
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* media device.
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*/
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void media_device_unregister(struct media_device *mdev);
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/**
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* media_device_register_entity() - registers a media entity inside a
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* previously registered media device.
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*
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* @mdev: pointer to struct &media_device
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* @entity: pointer to struct &media_entity to be registered
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*
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* Entities are identified by a unique positive integer ID. The media
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* controller framework will such ID automatically. IDs are not guaranteed
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* to be contiguous, and the ID number can change on newer Kernel versions.
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* So, neither the driver nor userspace should hardcode ID numbers to refer
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* to the entities, but, instead, use the framework to find the ID, when
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* needed.
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*
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* The media_entity name, type and flags fields should be initialized before
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* calling media_device_register_entity(). Entities embedded in higher-level
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* standard structures can have some of those fields set by the higher-level
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* framework.
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*
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* If the device has pads, media_entity_pads_init() should be called before
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* this function. Otherwise, the &media_entity.@pad and &media_entity.@num_pads
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* should be zeroed before calling this function.
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*
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* Entities have flags that describe the entity capabilities and state:
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*
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* %MEDIA_ENT_FL_DEFAULT indicates the default entity for a given type.
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* This can be used to report the default audio and video devices or the
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* default camera sensor.
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*
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* .. note::
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*
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* Drivers should set the entity function before calling this function.
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* Please notice that the values %MEDIA_ENT_F_V4L2_SUBDEV_UNKNOWN and
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* %MEDIA_ENT_F_UNKNOWN should not be used by the drivers.
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*/
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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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/**
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* media_device_unregister_entity() - unregisters a media entity.
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*
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* @entity: pointer to struct &media_entity to be unregistered
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*
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* All links associated with the entity and all PADs are automatically
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* unregistered from the media_device when this function is called.
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*
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* Unregistering an entity will not change the IDs of the other entities and
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* the previoully used ID will never be reused for a newly registered entities.
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*
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* When a media device is unregistered, all its entities are unregistered
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* automatically. No manual entities unregistration is then required.
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*
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* .. note::
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*
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* The media_entity instance itself must be freed explicitly by
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* the driver if required.
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*/
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void media_device_unregister_entity(struct media_entity *entity);
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/**
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* media_device_register_entity_notify() - Registers a media entity_notify
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* callback
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*
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* @mdev: The media device
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* @nptr: The media_entity_notify
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*
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* Note: When a new entity is registered, all the registered
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* media_entity_notify callbacks are invoked.
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*/
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int __must_check media_device_register_entity_notify(struct media_device *mdev,
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struct media_entity_notify *nptr);
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/**
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* media_device_unregister_entity_notify() - Unregister a media entity notify
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* callback
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*
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* @mdev: The media device
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* @nptr: The media_entity_notify
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*
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*/
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void media_device_unregister_entity_notify(struct media_device *mdev,
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struct media_entity_notify *nptr);
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/**
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* media_device_get_devres() - get media device as device resource
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* creates if one doesn't exist
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*
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* @dev: pointer to struct &device.
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*
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* Sometimes, the media controller &media_device needs to be shared by more
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* than one driver. This function adds support for that, by dynamically
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* allocating the &media_device and allowing it to be obtained from the
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* struct &device associated with the common device where all sub-device
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* components belong. So, for example, on an USB device with multiple
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* interfaces, each interface may be handled by a separate per-interface
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* drivers. While each interface have its own &device, they all share a
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* common &device associated with the hole USB device.
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*/
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struct media_device *media_device_get_devres(struct device *dev);
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/**
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* media_device_find_devres() - find media device as device resource
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*
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* @dev: pointer to struct &device.
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*/
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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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/**
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* media_device_pci_init() - create and initialize a
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* struct &media_device from a PCI device.
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*
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* @mdev: pointer to struct &media_device
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* @pci_dev: pointer to struct pci_dev
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* @name: media device name. If %NULL, the routine will use the default
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* name for the pci device, given by pci_name() macro.
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*/
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void media_device_pci_init(struct media_device *mdev,
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struct pci_dev *pci_dev,
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const char *name);
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/**
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* __media_device_usb_init() - create and initialize a
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* struct &media_device from a PCI device.
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*
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* @mdev: pointer to struct &media_device
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* @udev: pointer to struct usb_device
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* @board_name: media device name. If %NULL, the routine will use the usb
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* product name, if available.
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* @driver_name: name of the driver. if %NULL, the routine will use the name
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* given by udev->dev->driver->name, with is usually the wrong
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* thing to do.
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*
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* NOTE: It is better to call media_device_usb_init() instead, as
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* such macro fills driver_name with %KBUILD_MODNAME.
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*/
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void __media_device_usb_init(struct media_device *mdev,
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struct usb_device *udev,
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const char *board_name,
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const char *driver_name);
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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 int media_device_register_entity_notify(
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struct media_device *mdev,
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struct media_entity_notify *nptr)
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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_notify(
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struct media_device *mdev,
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struct media_entity_notify *nptr)
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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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static inline void media_device_pci_init(struct media_device *mdev,
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struct pci_dev *pci_dev,
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char *name)
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{
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}
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static inline void __media_device_usb_init(struct media_device *mdev,
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struct usb_device *udev,
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char *board_name,
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char *driver_name)
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{
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}
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#endif /* CONFIG_MEDIA_CONTROLLER */
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#define media_device_usb_init(mdev, udev, name) \
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__media_device_usb_init(mdev, udev, name, KBUILD_MODNAME)
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#endif
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