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* vimc-core.c Virtual Media Controller Driver
*
* Copyright (C) 2015-2017 Helen Koike <helen.fornazier@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* 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.
*
*/
#include <linux/component.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <media/media-device.h>
#include <media/v4l2-device.h>
#include "vimc-common.h"
#define VIMC_PDEV_NAME "vimc"
#define VIMC_MDEV_MODEL_NAME "VIMC MDEV"
#define VIMC_ENT_LINK(src, srcpad, sink, sinkpad, link_flags) { \
.src_ent = src, \
.src_pad = srcpad, \
.sink_ent = sink, \
.sink_pad = sinkpad, \
.flags = link_flags, \
}
struct vimc_device {
/* The platform device */
struct platform_device pdev;
/* The pipeline configuration */
const struct vimc_pipeline_config *pipe_cfg;
/* The Associated media_device parent */
struct media_device mdev;
/* Internal v4l2 parent device*/
struct v4l2_device v4l2_dev;
/* Subdevices */
struct platform_device **subdevs;
};
/* Structure which describes individual configuration for each entity */
struct vimc_ent_config {
const char *name;
const char *drv;
};
/* Structure which describes links between entities */
struct vimc_ent_link {
unsigned int src_ent;
u16 src_pad;
unsigned int sink_ent;
u16 sink_pad;
u32 flags;
};
/* Structure which describes the whole topology */
struct vimc_pipeline_config {
const struct vimc_ent_config *ents;
size_t num_ents;
const struct vimc_ent_link *links;
size_t num_links;
};
/* --------------------------------------------------------------------------
* Topology Configuration
*/
static const struct vimc_ent_config ent_config[] = {
{
.name = "Sensor A",
.drv = "vimc-sensor",
},
{
.name = "Sensor B",
.drv = "vimc-sensor",
},
{
.name = "Debayer A",
.drv = "vimc-debayer",
},
{
.name = "Debayer B",
.drv = "vimc-debayer",
},
{
.name = "Raw Capture 0",
.drv = "vimc-capture",
},
{
.name = "Raw Capture 1",
.drv = "vimc-capture",
},
{
.name = "RGB/YUV Input",
/* TODO: change this to vimc-input when it is implemented */
.drv = "vimc-sensor",
},
{
.name = "Scaler",
.drv = "vimc-scaler",
},
{
.name = "RGB/YUV Capture",
.drv = "vimc-capture",
},
};
static const struct vimc_ent_link ent_links[] = {
/* Link: Sensor A (Pad 0)->(Pad 0) Debayer A */
VIMC_ENT_LINK(0, 0, 2, 0, MEDIA_LNK_FL_ENABLED | MEDIA_LNK_FL_IMMUTABLE),
/* Link: Sensor A (Pad 0)->(Pad 0) Raw Capture 0 */
VIMC_ENT_LINK(0, 0, 4, 0, MEDIA_LNK_FL_ENABLED | MEDIA_LNK_FL_IMMUTABLE),
/* Link: Sensor B (Pad 0)->(Pad 0) Debayer B */
VIMC_ENT_LINK(1, 0, 3, 0, MEDIA_LNK_FL_ENABLED | MEDIA_LNK_FL_IMMUTABLE),
/* Link: Sensor B (Pad 0)->(Pad 0) Raw Capture 1 */
VIMC_ENT_LINK(1, 0, 5, 0, MEDIA_LNK_FL_ENABLED | MEDIA_LNK_FL_IMMUTABLE),
/* Link: Debayer A (Pad 1)->(Pad 0) Scaler */
VIMC_ENT_LINK(2, 1, 7, 0, MEDIA_LNK_FL_ENABLED),
/* Link: Debayer B (Pad 1)->(Pad 0) Scaler */
VIMC_ENT_LINK(3, 1, 7, 0, 0),
/* Link: RGB/YUV Input (Pad 0)->(Pad 0) Scaler */
VIMC_ENT_LINK(6, 0, 7, 0, 0),
/* Link: Scaler (Pad 1)->(Pad 0) RGB/YUV Capture */
VIMC_ENT_LINK(7, 1, 8, 0, MEDIA_LNK_FL_ENABLED | MEDIA_LNK_FL_IMMUTABLE),
};
static const struct vimc_pipeline_config pipe_cfg = {
.ents = ent_config,
.num_ents = ARRAY_SIZE(ent_config),
.links = ent_links,
.num_links = ARRAY_SIZE(ent_links)
};
/* -------------------------------------------------------------------------- */
static int vimc_create_links(struct vimc_device *vimc)
{
unsigned int i;
int ret;
/* Initialize the links between entities */
for (i = 0; i < vimc->pipe_cfg->num_links; i++) {
const struct vimc_ent_link *link = &vimc->pipe_cfg->links[i];
/*
* TODO: Check another way of retrieving ved struct without
* relying on platform_get_drvdata
*/
struct vimc_ent_device *ved_src =
platform_get_drvdata(vimc->subdevs[link->src_ent]);
struct vimc_ent_device *ved_sink =
platform_get_drvdata(vimc->subdevs[link->sink_ent]);
ret = media_create_pad_link(ved_src->ent, link->src_pad,
ved_sink->ent, link->sink_pad,
link->flags);
if (ret)
return ret;
}
return 0;
}
static int vimc_comp_bind(struct device *master)
{
struct vimc_device *vimc = container_of(to_platform_device(master),
struct vimc_device, pdev);
int ret;
dev_dbg(master, "bind");
/* Register the v4l2 struct */
ret = v4l2_device_register(vimc->mdev.dev, &vimc->v4l2_dev);
if (ret) {
dev_err(vimc->mdev.dev,
"v4l2 device register failed (err=%d)\n", ret);
return ret;
}
/* Bind subdevices */
ret = component_bind_all(master, &vimc->v4l2_dev);
if (ret)
goto err_v4l2_unregister;
/* Initialize links */
ret = vimc_create_links(vimc);
if (ret)
goto err_comp_unbind_all;
/* Register the media device */
ret = media_device_register(&vimc->mdev);
if (ret) {
dev_err(vimc->mdev.dev,
"media device register failed (err=%d)\n", ret);
goto err_comp_unbind_all;
}
/* Expose all subdev's nodes*/
ret = v4l2_device_register_subdev_nodes(&vimc->v4l2_dev);
if (ret) {
dev_err(vimc->mdev.dev,
"vimc subdev nodes registration failed (err=%d)\n",
ret);
goto err_mdev_unregister;
}
return 0;
err_mdev_unregister:
media_device_unregister(&vimc->mdev);
err_comp_unbind_all:
component_unbind_all(master, NULL);
err_v4l2_unregister:
v4l2_device_unregister(&vimc->v4l2_dev);
return ret;
}
static void vimc_comp_unbind(struct device *master)
{
struct vimc_device *vimc = container_of(to_platform_device(master),
struct vimc_device, pdev);
dev_dbg(master, "unbind");
media_device_unregister(&vimc->mdev);
component_unbind_all(master, NULL);
v4l2_device_unregister(&vimc->v4l2_dev);
}
static int vimc_comp_compare(struct device *comp, void *data)
{
const struct platform_device *pdev = to_platform_device(comp);
const char *name = data;
return !strcmp(pdev->dev.platform_data, name);
}
static struct component_match *vimc_add_subdevs(struct vimc_device *vimc)
{
struct component_match *match = NULL;
struct vimc_platform_data pdata;
int i;
for (i = 0; i < vimc->pipe_cfg->num_ents; i++) {
dev_dbg(&vimc->pdev.dev, "new pdev for %s\n",
vimc->pipe_cfg->ents[i].drv);
strlcpy(pdata.entity_name, vimc->pipe_cfg->ents[i].name,
sizeof(pdata.entity_name));
vimc->subdevs[i] = platform_device_register_data(&vimc->pdev.dev,
vimc->pipe_cfg->ents[i].drv,
PLATFORM_DEVID_AUTO,
&pdata,
sizeof(pdata));
if (!vimc->subdevs[i]) {
while (--i >= 0)
platform_device_unregister(vimc->subdevs[i]);
return ERR_PTR(-ENOMEM);
}
component_match_add(&vimc->pdev.dev, &match, vimc_comp_compare,
(void *)vimc->pipe_cfg->ents[i].name);
}
return match;
}
static void vimc_rm_subdevs(struct vimc_device *vimc)
{
unsigned int i;
for (i = 0; i < vimc->pipe_cfg->num_ents; i++)
platform_device_unregister(vimc->subdevs[i]);
}
static const struct component_master_ops vimc_comp_ops = {
.bind = vimc_comp_bind,
.unbind = vimc_comp_unbind,
};
static int vimc_probe(struct platform_device *pdev)
{
struct vimc_device *vimc = container_of(pdev, struct vimc_device, pdev);
struct component_match *match = NULL;
int ret;
dev_dbg(&pdev->dev, "probe");
/* Create platform_device for each entity in the topology*/
vimc->subdevs = devm_kcalloc(&vimc->pdev.dev, vimc->pipe_cfg->num_ents,
sizeof(*vimc->subdevs), GFP_KERNEL);
if (!vimc->subdevs)
return -ENOMEM;
match = vimc_add_subdevs(vimc);
if (IS_ERR(match))
return PTR_ERR(match);
/* Link the media device within the v4l2_device */
vimc->v4l2_dev.mdev = &vimc->mdev;
/* Initialize media device */
strlcpy(vimc->mdev.model, VIMC_MDEV_MODEL_NAME,
sizeof(vimc->mdev.model));
vimc->mdev.dev = &pdev->dev;
media_device_init(&vimc->mdev);
/* Add self to the component system */
ret = component_master_add_with_match(&pdev->dev, &vimc_comp_ops,
match);
if (ret) {
media_device_cleanup(&vimc->mdev);
vimc_rm_subdevs(vimc);
kfree(vimc);
return ret;
}
return 0;
}
static int vimc_remove(struct platform_device *pdev)
{
struct vimc_device *vimc = container_of(pdev, struct vimc_device, pdev);
dev_dbg(&pdev->dev, "remove");
component_master_del(&pdev->dev, &vimc_comp_ops);
vimc_rm_subdevs(vimc);
return 0;
}
static void vimc_dev_release(struct device *dev)
{
}
static struct vimc_device vimc_dev = {
.pipe_cfg = &pipe_cfg,
.pdev = {
.name = VIMC_PDEV_NAME,
.dev.release = vimc_dev_release,
}
};
static struct platform_driver vimc_pdrv = {
.probe = vimc_probe,
.remove = vimc_remove,
.driver = {
.name = VIMC_PDEV_NAME,
},
};
static int __init vimc_init(void)
{
int ret;
ret = platform_device_register(&vimc_dev.pdev);
if (ret) {
dev_err(&vimc_dev.pdev.dev,
"platform device registration failed (err=%d)\n", ret);
return ret;
}
ret = platform_driver_register(&vimc_pdrv);
if (ret) {
dev_err(&vimc_dev.pdev.dev,
"platform driver registration failed (err=%d)\n", ret);
platform_driver_unregister(&vimc_pdrv);
return ret;
}
return 0;
}
static void __exit vimc_exit(void)
{
platform_driver_unregister(&vimc_pdrv);
platform_device_unregister(&vimc_dev.pdev);
}
module_init(vimc_init);
module_exit(vimc_exit);
MODULE_DESCRIPTION("Virtual Media Controller Driver (VIMC)");
MODULE_AUTHOR("Helen Fornazier <helen.fornazier@gmail.com>");
MODULE_LICENSE("GPL");
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