mirror of
https://github.com/torvalds/linux.git
synced 2024-11-24 13:11:40 +00:00
2bd8682375
Since the driver_version field in struct media_device is no longer used, just remove it. Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
479 lines
16 KiB
C
479 lines
16 KiB
C
/*
|
|
* 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.
|
|
*/
|
|
|
|
#ifndef _MEDIA_DEVICE_H
|
|
#define _MEDIA_DEVICE_H
|
|
|
|
#include <linux/list.h>
|
|
#include <linux/mutex.h>
|
|
|
|
#include <media/media-devnode.h>
|
|
#include <media/media-entity.h>
|
|
|
|
struct ida;
|
|
struct device;
|
|
|
|
/**
|
|
* struct media_entity_notify - Media Entity Notify
|
|
*
|
|
* @list: List head
|
|
* @notify_data: Input data to invoke the callback
|
|
* @notify: Callback function pointer
|
|
*
|
|
* Drivers may register a callback to take action when new entities get
|
|
* registered with the media device. This handler is intended for creating
|
|
* links between existing entities and should not create entities and register
|
|
* them.
|
|
*/
|
|
struct media_entity_notify {
|
|
struct list_head list;
|
|
void *notify_data;
|
|
void (*notify)(struct media_entity *entity, void *notify_data);
|
|
};
|
|
|
|
/**
|
|
* struct media_device_ops - Media device operations
|
|
* @link_notify: Link state change notification callback. This callback is
|
|
* called with the graph_mutex held.
|
|
*/
|
|
struct media_device_ops {
|
|
int (*link_notify)(struct media_link *link, u32 flags,
|
|
unsigned int notification);
|
|
};
|
|
|
|
/**
|
|
* struct media_device - Media device
|
|
* @dev: Parent device
|
|
* @devnode: Media device node
|
|
* @driver_name: Optional device driver name. If not set, calls to
|
|
* %MEDIA_IOC_DEVICE_INFO will return ``dev->driver->name``.
|
|
* This is needed for USB drivers for example, as otherwise
|
|
* they'll all appear as if the driver name was "usb".
|
|
* @model: Device model name
|
|
* @serial: Device serial number (optional)
|
|
* @bus_info: Unique and stable device location identifier
|
|
* @hw_revision: Hardware device revision
|
|
* @topology_version: Monotonic counter for storing the version of the graph
|
|
* topology. Should be incremented each time the topology changes.
|
|
* @id: Unique ID used on the last registered graph object
|
|
* @entity_internal_idx: Unique internal entity ID used by the graph traversal
|
|
* algorithms
|
|
* @entity_internal_idx_max: Allocated internal entity indices
|
|
* @entities: List of registered entities
|
|
* @interfaces: List of registered interfaces
|
|
* @pads: List of registered pads
|
|
* @links: List of registered links
|
|
* @entity_notify: List of registered entity_notify callbacks
|
|
* @graph_mutex: Protects access to struct media_device data
|
|
* @pm_count_walk: Graph walk for power state walk. Access serialised using
|
|
* graph_mutex.
|
|
*
|
|
* @source_priv: Driver Private data for enable/disable source handlers
|
|
* @enable_source: Enable Source Handler function pointer
|
|
* @disable_source: Disable Source Handler function pointer
|
|
*
|
|
* @ops: Operation handler callbacks
|
|
*
|
|
* 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.
|
|
*
|
|
* @enable_source is a handler to find source entity for the
|
|
* sink entity and activate the link between them if source
|
|
* entity is free. Drivers should call this handler before
|
|
* accessing the source.
|
|
*
|
|
* @disable_source is a handler to find source entity for the
|
|
* sink entity and deactivate the link between them. Drivers
|
|
* should call this handler to release the source.
|
|
*
|
|
* Use-case: find tuner entity connected to the decoder
|
|
* entity and check if it is available, and activate the
|
|
* the link between them from @enable_source and deactivate
|
|
* from @disable_source.
|
|
*
|
|
* .. note::
|
|
*
|
|
* Bridge driver is expected to implement and set the
|
|
* handler when &media_device is registered or when
|
|
* bridge driver finds the media_device during probe.
|
|
* Bridge driver sets source_priv with information
|
|
* necessary to run @enable_source and @disable_source handlers.
|
|
* Callers should hold graph_mutex to access and call @enable_source
|
|
* and @disable_source handlers.
|
|
*/
|
|
struct media_device {
|
|
/* dev->driver_data points to this struct. */
|
|
struct device *dev;
|
|
struct media_devnode *devnode;
|
|
|
|
char model[32];
|
|
char driver_name[32];
|
|
char serial[40];
|
|
char bus_info[32];
|
|
u32 hw_revision;
|
|
|
|
u64 topology_version;
|
|
|
|
u32 id;
|
|
struct ida entity_internal_idx;
|
|
int entity_internal_idx_max;
|
|
|
|
struct list_head entities;
|
|
struct list_head interfaces;
|
|
struct list_head pads;
|
|
struct list_head links;
|
|
|
|
/* notify callback list invoked when a new entity is registered */
|
|
struct list_head entity_notify;
|
|
|
|
/* Serializes graph operations. */
|
|
struct mutex graph_mutex;
|
|
struct media_graph pm_count_walk;
|
|
|
|
void *source_priv;
|
|
int (*enable_source)(struct media_entity *entity,
|
|
struct media_pipeline *pipe);
|
|
void (*disable_source)(struct media_entity *entity);
|
|
|
|
const struct media_device_ops *ops;
|
|
};
|
|
|
|
/* We don't need to include pci.h or usb.h here */
|
|
struct pci_dev;
|
|
struct usb_device;
|
|
|
|
#ifdef CONFIG_MEDIA_CONTROLLER
|
|
|
|
/* Supported link_notify @notification values. */
|
|
#define MEDIA_DEV_NOTIFY_PRE_LINK_CH 0
|
|
#define MEDIA_DEV_NOTIFY_POST_LINK_CH 1
|
|
|
|
/**
|
|
* media_entity_enum_init - Initialise an entity enumeration
|
|
*
|
|
* @ent_enum: Entity enumeration to be initialised
|
|
* @mdev: The related media device
|
|
*
|
|
* Return: zero on success or a negative error code.
|
|
*/
|
|
static inline __must_check int media_entity_enum_init(
|
|
struct media_entity_enum *ent_enum, struct media_device *mdev)
|
|
{
|
|
return __media_entity_enum_init(ent_enum,
|
|
mdev->entity_internal_idx_max + 1);
|
|
}
|
|
|
|
/**
|
|
* media_device_init() - Initializes a media device element
|
|
*
|
|
* @mdev: pointer to struct &media_device
|
|
*
|
|
* This function initializes the media device prior to its registration.
|
|
* The media device initialization and registration is split in two functions
|
|
* to avoid race conditions and make the media device available to user-space
|
|
* before the media graph has been completed.
|
|
*
|
|
* So drivers need to first initialize the media device, register any entity
|
|
* within the media device, create pad to pad links and then finally register
|
|
* the media device by calling media_device_register() as a final step.
|
|
*/
|
|
void media_device_init(struct media_device *mdev);
|
|
|
|
/**
|
|
* media_device_cleanup() - Cleanups a media device element
|
|
*
|
|
* @mdev: pointer to struct &media_device
|
|
*
|
|
* This function that will destroy the graph_mutex that is
|
|
* initialized in media_device_init().
|
|
*/
|
|
void media_device_cleanup(struct media_device *mdev);
|
|
|
|
/**
|
|
* __media_device_register() - Registers a media device element
|
|
*
|
|
* @mdev: pointer to struct &media_device
|
|
* @owner: should be filled with %THIS_MODULE
|
|
*
|
|
* Users, should, instead, call the media_device_register() macro.
|
|
*
|
|
* The caller is responsible for initializing the &media_device structure
|
|
* before registration. The following fields of &media_device must be set:
|
|
*
|
|
* - &media_entity.dev must point to the parent device (usually a &pci_dev,
|
|
* &usb_interface or &platform_device instance).
|
|
*
|
|
* - &media_entity.model must be filled with the device model name as a
|
|
* NUL-terminated UTF-8 string. The device/model revision must not be
|
|
* stored in this field.
|
|
*
|
|
* The following fields are optional:
|
|
*
|
|
* - &media_entity.serial is a unique serial number stored as a
|
|
* NUL-terminated ASCII string. The field is big enough to store a GUID
|
|
* in text form. If the hardware doesn't provide a unique serial number
|
|
* this field must be left empty.
|
|
*
|
|
* - &media_entity.bus_info represents the location of the device in the
|
|
* system as a NUL-terminated ASCII string. For PCI/PCIe devices
|
|
* &media_entity.bus_info must be set to "PCI:" (or "PCIe:") followed by
|
|
* the value of pci_name(). For USB devices,the usb_make_path() function
|
|
* must be used. This field is used by applications to distinguish between
|
|
* otherwise identical devices that don't provide a serial number.
|
|
*
|
|
* - &media_entity.hw_revision is the hardware device revision in a
|
|
* driver-specific format. When possible the revision should be formatted
|
|
* with the KERNEL_VERSION() macro.
|
|
*
|
|
* .. note::
|
|
*
|
|
* #) 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.
|
|
*
|
|
* #) Unregistering a media device that hasn't been registered is **NOT** safe.
|
|
*
|
|
* Return: returns zero on success or a negative error code.
|
|
*/
|
|
int __must_check __media_device_register(struct media_device *mdev,
|
|
struct module *owner);
|
|
|
|
|
|
/**
|
|
* media_device_register() - Registers a media device element
|
|
*
|
|
* @mdev: pointer to struct &media_device
|
|
*
|
|
* This macro calls __media_device_register() passing %THIS_MODULE as
|
|
* the __media_device_register() second argument (**owner**).
|
|
*/
|
|
#define media_device_register(mdev) __media_device_register(mdev, THIS_MODULE)
|
|
|
|
/**
|
|
* media_device_unregister() - Unregisters a media device element
|
|
*
|
|
* @mdev: pointer to struct &media_device
|
|
*
|
|
* It is safe to call this function on an unregistered (but initialised)
|
|
* media device.
|
|
*/
|
|
void media_device_unregister(struct media_device *mdev);
|
|
|
|
/**
|
|
* media_device_register_entity() - registers a media entity inside a
|
|
* previously registered media device.
|
|
*
|
|
* @mdev: pointer to struct &media_device
|
|
* @entity: pointer to struct &media_entity to be registered
|
|
*
|
|
* Entities are identified by a unique positive integer ID. The media
|
|
* controller framework will such ID automatically. IDs are not guaranteed
|
|
* to be contiguous, and the ID number can change on newer Kernel versions.
|
|
* So, neither the driver nor userspace should hardcode ID numbers to refer
|
|
* to the entities, but, instead, use the framework to find the ID, when
|
|
* needed.
|
|
*
|
|
* The media_entity name, type and flags fields should be initialized before
|
|
* calling media_device_register_entity(). Entities embedded in higher-level
|
|
* standard structures can have some of those fields set by the higher-level
|
|
* framework.
|
|
*
|
|
* If the device has pads, media_entity_pads_init() should be called before
|
|
* this function. Otherwise, the &media_entity.pad and &media_entity.num_pads
|
|
* should be zeroed before calling this function.
|
|
*
|
|
* Entities have flags that describe the entity capabilities and state:
|
|
*
|
|
* %MEDIA_ENT_FL_DEFAULT
|
|
* indicates the default entity for a given type.
|
|
* This can be used to report the default audio and video devices or the
|
|
* default camera sensor.
|
|
*
|
|
* .. note::
|
|
*
|
|
* Drivers should set the entity function before calling this function.
|
|
* Please notice that the values %MEDIA_ENT_F_V4L2_SUBDEV_UNKNOWN and
|
|
* %MEDIA_ENT_F_UNKNOWN should not be used by the drivers.
|
|
*/
|
|
int __must_check media_device_register_entity(struct media_device *mdev,
|
|
struct media_entity *entity);
|
|
|
|
/**
|
|
* media_device_unregister_entity() - unregisters a media entity.
|
|
*
|
|
* @entity: pointer to struct &media_entity to be unregistered
|
|
*
|
|
* All links associated with the entity and all PADs are automatically
|
|
* unregistered from the media_device when this function is called.
|
|
*
|
|
* Unregistering an entity will not change the IDs of the other entities and
|
|
* the previoully used ID will never be reused for a newly registered entities.
|
|
*
|
|
* When a media device is unregistered, all its entities are unregistered
|
|
* automatically. No manual entities unregistration is then required.
|
|
*
|
|
* .. note::
|
|
*
|
|
* The media_entity instance itself must be freed explicitly by
|
|
* the driver if required.
|
|
*/
|
|
void media_device_unregister_entity(struct media_entity *entity);
|
|
|
|
/**
|
|
* media_device_register_entity_notify() - Registers a media entity_notify
|
|
* callback
|
|
*
|
|
* @mdev: The media device
|
|
* @nptr: The media_entity_notify
|
|
*
|
|
* .. note::
|
|
*
|
|
* When a new entity is registered, all the registered
|
|
* media_entity_notify callbacks are invoked.
|
|
*/
|
|
|
|
int __must_check media_device_register_entity_notify(struct media_device *mdev,
|
|
struct media_entity_notify *nptr);
|
|
|
|
/**
|
|
* media_device_unregister_entity_notify() - Unregister a media entity notify
|
|
* callback
|
|
*
|
|
* @mdev: The media device
|
|
* @nptr: The media_entity_notify
|
|
*
|
|
*/
|
|
void media_device_unregister_entity_notify(struct media_device *mdev,
|
|
struct media_entity_notify *nptr);
|
|
|
|
/* Iterate over all entities. */
|
|
#define media_device_for_each_entity(entity, mdev) \
|
|
list_for_each_entry(entity, &(mdev)->entities, graph_obj.list)
|
|
|
|
/* Iterate over all interfaces. */
|
|
#define media_device_for_each_intf(intf, mdev) \
|
|
list_for_each_entry(intf, &(mdev)->interfaces, graph_obj.list)
|
|
|
|
/* Iterate over all pads. */
|
|
#define media_device_for_each_pad(pad, mdev) \
|
|
list_for_each_entry(pad, &(mdev)->pads, graph_obj.list)
|
|
|
|
/* Iterate over all links. */
|
|
#define media_device_for_each_link(link, mdev) \
|
|
list_for_each_entry(link, &(mdev)->links, graph_obj.list)
|
|
|
|
/**
|
|
* media_device_pci_init() - create and initialize a
|
|
* struct &media_device from a PCI device.
|
|
*
|
|
* @mdev: pointer to struct &media_device
|
|
* @pci_dev: pointer to struct pci_dev
|
|
* @name: media device name. If %NULL, the routine will use the default
|
|
* name for the pci device, given by pci_name() macro.
|
|
*/
|
|
void media_device_pci_init(struct media_device *mdev,
|
|
struct pci_dev *pci_dev,
|
|
const char *name);
|
|
/**
|
|
* __media_device_usb_init() - create and initialize a
|
|
* struct &media_device from a PCI device.
|
|
*
|
|
* @mdev: pointer to struct &media_device
|
|
* @udev: pointer to struct usb_device
|
|
* @board_name: media device name. If %NULL, the routine will use the usb
|
|
* product name, if available.
|
|
* @driver_name: name of the driver. if %NULL, the routine will use the name
|
|
* given by ``udev->dev->driver->name``, with is usually the wrong
|
|
* thing to do.
|
|
*
|
|
* .. note::
|
|
*
|
|
* It is better to call media_device_usb_init() instead, as
|
|
* such macro fills driver_name with %KBUILD_MODNAME.
|
|
*/
|
|
void __media_device_usb_init(struct media_device *mdev,
|
|
struct usb_device *udev,
|
|
const char *board_name,
|
|
const char *driver_name);
|
|
|
|
#else
|
|
static inline int media_device_register(struct media_device *mdev)
|
|
{
|
|
return 0;
|
|
}
|
|
static inline void media_device_unregister(struct media_device *mdev)
|
|
{
|
|
}
|
|
static inline int media_device_register_entity(struct media_device *mdev,
|
|
struct media_entity *entity)
|
|
{
|
|
return 0;
|
|
}
|
|
static inline void media_device_unregister_entity(struct media_entity *entity)
|
|
{
|
|
}
|
|
static inline int media_device_register_entity_notify(
|
|
struct media_device *mdev,
|
|
struct media_entity_notify *nptr)
|
|
{
|
|
return 0;
|
|
}
|
|
static inline void media_device_unregister_entity_notify(
|
|
struct media_device *mdev,
|
|
struct media_entity_notify *nptr)
|
|
{
|
|
}
|
|
|
|
static inline void media_device_pci_init(struct media_device *mdev,
|
|
struct pci_dev *pci_dev,
|
|
char *name)
|
|
{
|
|
}
|
|
|
|
static inline void __media_device_usb_init(struct media_device *mdev,
|
|
struct usb_device *udev,
|
|
char *board_name,
|
|
char *driver_name)
|
|
{
|
|
}
|
|
|
|
#endif /* CONFIG_MEDIA_CONTROLLER */
|
|
|
|
/**
|
|
* media_device_usb_init() - create and initialize a
|
|
* struct &media_device from a PCI device.
|
|
*
|
|
* @mdev: pointer to struct &media_device
|
|
* @udev: pointer to struct usb_device
|
|
* @name: media device name. If %NULL, the routine will use the usb
|
|
* product name, if available.
|
|
*
|
|
* This macro calls media_device_usb_init() passing the
|
|
* media_device_usb_init() **driver_name** parameter filled with
|
|
* %KBUILD_MODNAME.
|
|
*/
|
|
#define media_device_usb_init(mdev, udev, name) \
|
|
__media_device_usb_init(mdev, udev, name, KBUILD_MODNAME)
|
|
|
|
#endif
|