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[media] vimc: Subdevices as modules

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Change the core structure for adding subdevices in the topology.
Instead of calling the specific create function for each subdevice,
inject a child platform_device with the driver's name.
Each type of node in the topology (sensor, capture, debayer, scaler)
will register a platform_driver with the corresponding name through the
component subsystem.
Implementing a new subdevice type doesn't require vimc-core to be altered.

This facilitates future implementation of dynamic entities, where
hotpluging an entity in the topology is just a matter of
registering/unregistering a platform_device in the system.
It also facilitates other implementations of different nodes without
touching the core code and remove the need of a header file for each
type of node.

Signed-off-by: Helen Koike <helen.koike@collabora.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Helen Fornazier
2017-06-19 14:00:18 -03:00
committed by Mauro Carvalho Chehab
parent 535d296f48
commit 4a29b70907
8 changed files with 345 additions and 394 deletions
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29
drivers/media/platform/vimc/vimc-common.h
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@@ -1,5 +1,5 @@
/*
* vimc-ccommon.h Virtual Media Controller Driver
* vimc-common.h Virtual Media Controller Driver
*
* Copyright (C) 2015-2017 Helen Koike <helen.fornazier@gmail.com>
*
@@ -53,6 +53,21 @@ do { \
(fmt)->xfer_func = V4L2_XFER_FUNC_DEFAULT; \
} while (0)
/**
* struct vimc_platform_data - platform data to components
*
* @entity_name: The name of the entity to be created
*
* Board setup code will often provide additional information using the device's
* platform_data field to hold additional information.
* When injecting a new platform_device in the component system the core needs
* to provide to the corresponding submodules the name of the entity that should
* be used when registering the subdevice in the Media Controller system.
*/
struct vimc_platform_data {
char entity_name[32];
};
/**
* struct vimc_pix_map - maps media bus code with v4l2 pixel format
*
@@ -74,7 +89,6 @@ struct vimc_pix_map {
*
* @ent: the pointer to struct media_entity for the node
* @pads: the list of pads of the node
* @destroy: callback to destroy the node
* @process_frame: callback send a frame to that node
* @vdev_get_format: callback that returns the current format a pad, used
* only when is_media_entity_v4l2_video_device(ent) returns
@@ -91,7 +105,6 @@ struct vimc_pix_map {
struct vimc_ent_device {
struct media_entity *ent;
struct media_pad *pads;
void (*destroy)(struct vimc_ent_device *);
void (*process_frame)(struct vimc_ent_device *ved,
struct media_pad *sink, const void *frame);
void (*vdev_get_format)(struct vimc_ent_device *ved,
@@ -176,7 +189,6 @@ const struct vimc_pix_map *vimc_pix_map_by_pixelformat(u32 pixelformat);
* @num_pads: number of pads to initialize
* @pads_flag: flags to use in each pad
* @sd_ops: pointer to &struct v4l2_subdev_ops.
* @sd_destroy: callback to destroy the node
*
* Helper function initialize and register the struct vimc_ent_device and struct
* v4l2_subdev which represents a subdev node in the topology
@@ -188,14 +200,13 @@ int vimc_ent_sd_register(struct vimc_ent_device *ved,
u32 function,
u16 num_pads,
const unsigned long *pads_flag,
const struct v4l2_subdev_ops *sd_ops,
void (*sd_destroy)(struct vimc_ent_device *));
const struct v4l2_subdev_ops *sd_ops);
/**
* vimc_ent_sd_register - initialize and register a subdev node
* vimc_ent_sd_unregister - cleanup and unregister a subdev node
*
* @ved: the vimc_ent_device struct to be initialize
* @sd: the v4l2_subdev struct to be initialize and registered
* @ved: the vimc_ent_device struct to be cleaned up
* @sd: the v4l2_subdev struct to be unregistered
*
* Helper function cleanup and unregister the struct vimc_ent_device and struct
* v4l2_subdev which represents a subdev node in the topology