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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/init.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <media/media-device.h>
#include <media/v4l2-device.h>
#include "vimc-capture.h"
#include "vimc-core.h"
#include "vimc-sensor.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 pipeline configuration
* (filled before calling vimc_device_register)
*/
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;
/* Internal topology */
struct vimc_ent_device **ved;
};
/**
* enum vimc_ent_node - Select the functionality of a node in the topology
* @VIMC_ENT_NODE_SENSOR: A node of type SENSOR simulates a camera sensor
* generating internal images in bayer format and
* propagating those images through the pipeline
* @VIMC_ENT_NODE_CAPTURE: A node of type CAPTURE is a v4l2 video_device
* that exposes the received image from the
* pipeline to the user space
* @VIMC_ENT_NODE_INPUT: A node of type INPUT is a v4l2 video_device that
* receives images from the user space and
* propagates them through the pipeline
* @VIMC_ENT_NODE_DEBAYER: A node type DEBAYER expects to receive a frame
* in bayer format converts it to RGB
* @VIMC_ENT_NODE_SCALER: A node of type SCALER scales the received image
* by a given multiplier
*
* This enum is used in the entity configuration struct to allow the definition
* of a custom topology specifying the role of each node on it.
*/
enum vimc_ent_node {
VIMC_ENT_NODE_SENSOR,
VIMC_ENT_NODE_CAPTURE,
VIMC_ENT_NODE_INPUT,
VIMC_ENT_NODE_DEBAYER,
VIMC_ENT_NODE_SCALER,
};
/* Structure which describes individual configuration for each entity */
struct vimc_ent_config {
const char *name;
size_t pads_qty;
const unsigned long *pads_flag;
enum vimc_ent_node node;
};
/* 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",
.pads_qty = 1,
.pads_flag = (const unsigned long[]){MEDIA_PAD_FL_SOURCE},
.node = VIMC_ENT_NODE_SENSOR,
},
{
.name = "Sensor B",
.pads_qty = 1,
.pads_flag = (const unsigned long[]){MEDIA_PAD_FL_SOURCE},
.node = VIMC_ENT_NODE_SENSOR,
},
{
.name = "Debayer A",
.pads_qty = 2,
.pads_flag = (const unsigned long[]){MEDIA_PAD_FL_SINK,
MEDIA_PAD_FL_SOURCE},
.node = VIMC_ENT_NODE_DEBAYER,
},
{
.name = "Debayer B",
.pads_qty = 2,
.pads_flag = (const unsigned long[]){MEDIA_PAD_FL_SINK,
MEDIA_PAD_FL_SOURCE},
.node = VIMC_ENT_NODE_DEBAYER,
},
{
.name = "Raw Capture 0",
.pads_qty = 1,
.pads_flag = (const unsigned long[]){MEDIA_PAD_FL_SINK},
.node = VIMC_ENT_NODE_CAPTURE,
},
{
.name = "Raw Capture 1",
.pads_qty = 1,
.pads_flag = (const unsigned long[]){MEDIA_PAD_FL_SINK},
.node = VIMC_ENT_NODE_CAPTURE,
},
{
.name = "RGB/YUV Input",
.pads_qty = 1,
.pads_flag = (const unsigned long[]){MEDIA_PAD_FL_SOURCE},
.node = VIMC_ENT_NODE_INPUT,
},
{
.name = "Scaler",
.pads_qty = 2,
.pads_flag = (const unsigned long[]){MEDIA_PAD_FL_SINK,
MEDIA_PAD_FL_SOURCE},
.node = VIMC_ENT_NODE_SCALER,
},
{
.name = "RGB/YUV Capture",
.pads_qty = 1,
.pads_flag = (const unsigned long[]){MEDIA_PAD_FL_SINK},
.node = VIMC_ENT_NODE_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 const struct vimc_pix_map vimc_pix_map_list[] = {
/* TODO: add all missing formats */
/* RGB formats */
{
.code = MEDIA_BUS_FMT_BGR888_1X24,
.pixelformat = V4L2_PIX_FMT_BGR24,
.bpp = 3,
},
{
.code = MEDIA_BUS_FMT_RGB888_1X24,
.pixelformat = V4L2_PIX_FMT_RGB24,
.bpp = 3,
},
{
.code = MEDIA_BUS_FMT_ARGB8888_1X32,
.pixelformat = V4L2_PIX_FMT_ARGB32,
.bpp = 4,
},
/* Bayer formats */
{
.code = MEDIA_BUS_FMT_SBGGR8_1X8,
.pixelformat = V4L2_PIX_FMT_SBGGR8,
.bpp = 1,
},
{
.code = MEDIA_BUS_FMT_SGBRG8_1X8,
.pixelformat = V4L2_PIX_FMT_SGBRG8,
.bpp = 1,
},
{
.code = MEDIA_BUS_FMT_SGRBG8_1X8,
.pixelformat = V4L2_PIX_FMT_SGRBG8,
.bpp = 1,
},
{
.code = MEDIA_BUS_FMT_SRGGB8_1X8,
.pixelformat = V4L2_PIX_FMT_SRGGB8,
.bpp = 1,
},
{
.code = MEDIA_BUS_FMT_SBGGR10_1X10,
.pixelformat = V4L2_PIX_FMT_SBGGR10,
.bpp = 2,
},
{
.code = MEDIA_BUS_FMT_SGBRG10_1X10,
.pixelformat = V4L2_PIX_FMT_SGBRG10,
.bpp = 2,
},
{
.code = MEDIA_BUS_FMT_SGRBG10_1X10,
.pixelformat = V4L2_PIX_FMT_SGRBG10,
.bpp = 2,
},
{
.code = MEDIA_BUS_FMT_SRGGB10_1X10,
.pixelformat = V4L2_PIX_FMT_SRGGB10,
.bpp = 2,
},
/* 10bit raw bayer a-law compressed to 8 bits */
{
.code = MEDIA_BUS_FMT_SBGGR10_ALAW8_1X8,
.pixelformat = V4L2_PIX_FMT_SBGGR10ALAW8,
.bpp = 1,
},
{
.code = MEDIA_BUS_FMT_SGBRG10_ALAW8_1X8,
.pixelformat = V4L2_PIX_FMT_SGBRG10ALAW8,
.bpp = 1,
},
{
.code = MEDIA_BUS_FMT_SGRBG10_ALAW8_1X8,
.pixelformat = V4L2_PIX_FMT_SGRBG10ALAW8,
.bpp = 1,
},
{
.code = MEDIA_BUS_FMT_SRGGB10_ALAW8_1X8,
.pixelformat = V4L2_PIX_FMT_SRGGB10ALAW8,
.bpp = 1,
},
/* 10bit raw bayer DPCM compressed to 8 bits */
{
.code = MEDIA_BUS_FMT_SBGGR10_DPCM8_1X8,
.pixelformat = V4L2_PIX_FMT_SBGGR10DPCM8,
.bpp = 1,
},
{
.code = MEDIA_BUS_FMT_SGBRG10_DPCM8_1X8,
.pixelformat = V4L2_PIX_FMT_SGBRG10DPCM8,
.bpp = 1,
},
{
.code = MEDIA_BUS_FMT_SGRBG10_DPCM8_1X8,
.pixelformat = V4L2_PIX_FMT_SGRBG10DPCM8,
.bpp = 1,
},
{
.code = MEDIA_BUS_FMT_SRGGB10_DPCM8_1X8,
.pixelformat = V4L2_PIX_FMT_SRGGB10DPCM8,
.bpp = 1,
},
{
.code = MEDIA_BUS_FMT_SBGGR12_1X12,
.pixelformat = V4L2_PIX_FMT_SBGGR12,
.bpp = 2,
},
{
.code = MEDIA_BUS_FMT_SGBRG12_1X12,
.pixelformat = V4L2_PIX_FMT_SGBRG12,
.bpp = 2,
},
{
.code = MEDIA_BUS_FMT_SGRBG12_1X12,
.pixelformat = V4L2_PIX_FMT_SGRBG12,
.bpp = 2,
},
{
.code = MEDIA_BUS_FMT_SRGGB12_1X12,
.pixelformat = V4L2_PIX_FMT_SRGGB12,
.bpp = 2,
},
};
const struct vimc_pix_map *vimc_pix_map_by_code(u32 code)
{
unsigned int i;
for (i = 0; i < ARRAY_SIZE(vimc_pix_map_list); i++) {
if (vimc_pix_map_list[i].code == code)
return &vimc_pix_map_list[i];
}
return NULL;
}
const struct vimc_pix_map *vimc_pix_map_by_pixelformat(u32 pixelformat)
{
unsigned int i;
for (i = 0; i < ARRAY_SIZE(vimc_pix_map_list); i++) {
if (vimc_pix_map_list[i].pixelformat == pixelformat)
return &vimc_pix_map_list[i];
}
return NULL;
}
int vimc_propagate_frame(struct media_pad *src, const void *frame)
{
struct media_link *link;
if (!(src->flags & MEDIA_PAD_FL_SOURCE))
return -EINVAL;
/* Send this frame to all sink pads that are direct linked */
list_for_each_entry(link, &src->entity->links, list) {
if (link->source == src &&
(link->flags & MEDIA_LNK_FL_ENABLED)) {
struct vimc_ent_device *ved = NULL;
struct media_entity *entity = link->sink->entity;
if (is_media_entity_v4l2_subdev(entity)) {
struct v4l2_subdev *sd =
container_of(entity, struct v4l2_subdev,
entity);
ved = v4l2_get_subdevdata(sd);
} else if (is_media_entity_v4l2_video_device(entity)) {
struct video_device *vdev =
container_of(entity,
struct video_device,
entity);
ved = video_get_drvdata(vdev);
}
if (ved && ved->process_frame)
ved->process_frame(ved, link->sink, frame);
}
}
return 0;
}
static void vimc_device_unregister(struct vimc_device *vimc)
{
unsigned int i;
media_device_unregister(&vimc->mdev);
/* Cleanup (only initialized) entities */
for (i = 0; i < vimc->pipe_cfg->num_ents; i++) {
if (vimc->ved[i] && vimc->ved[i]->destroy)
vimc->ved[i]->destroy(vimc->ved[i]);
vimc->ved[i] = NULL;
}
v4l2_device_unregister(&vimc->v4l2_dev);
media_device_cleanup(&vimc->mdev);
}
/* Helper function to allocate and initialize pads */
struct media_pad *vimc_pads_init(u16 num_pads, const unsigned long *pads_flag)
{
struct media_pad *pads;
unsigned int i;
/* Allocate memory for the pads */
pads = kcalloc(num_pads, sizeof(*pads), GFP_KERNEL);
if (!pads)
return ERR_PTR(-ENOMEM);
/* Initialize the pads */
for (i = 0; i < num_pads; i++) {
pads[i].index = i;
pads[i].flags = pads_flag[i];
}
return pads;
}
/*
* TODO: remove this function when all the
* entities specific code are implemented
*/
static void vimc_raw_destroy(struct vimc_ent_device *ved)
{
media_device_unregister_entity(ved->ent);
media_entity_cleanup(ved->ent);
vimc_pads_cleanup(ved->pads);
kfree(ved->ent);
kfree(ved);
}
/*
* TODO: remove this function when all the
* entities specific code are implemented
*/
static struct vimc_ent_device *vimc_raw_create(struct v4l2_device *v4l2_dev,
const char *const name,
u16 num_pads,
const unsigned long *pads_flag)
{
struct vimc_ent_device *ved;
int ret;
/* Allocate the main ved struct */
ved = kzalloc(sizeof(*ved), GFP_KERNEL);
if (!ved)
return ERR_PTR(-ENOMEM);
/* Allocate the media entity */
ved->ent = kzalloc(sizeof(*ved->ent), GFP_KERNEL);
if (!ved->ent) {
ret = -ENOMEM;
goto err_free_ved;
}
/* Allocate the pads */
ved->pads = vimc_pads_init(num_pads, pads_flag);
if (IS_ERR(ved->pads)) {
ret = PTR_ERR(ved->pads);
goto err_free_ent;
}
/* Initialize the media entity */
ved->ent->name = name;
ved->ent->function = MEDIA_ENT_F_V4L2_SUBDEV_UNKNOWN;
ret = media_entity_pads_init(ved->ent, num_pads, ved->pads);
if (ret)
goto err_cleanup_pads;
/* Register the media entity */
ret = media_device_register_entity(v4l2_dev->mdev, ved->ent);
if (ret)
goto err_cleanup_entity;
/* Fill out the destroy function and return */
ved->destroy = vimc_raw_destroy;
return ved;
err_cleanup_entity:
media_entity_cleanup(ved->ent);
err_cleanup_pads:
vimc_pads_cleanup(ved->pads);
err_free_ent:
kfree(ved->ent);
err_free_ved:
kfree(ved);
return ERR_PTR(ret);
}
static int vimc_device_register(struct vimc_device *vimc)
{
unsigned int i;
int ret;
/* Allocate memory for the vimc_ent_devices pointers */
vimc->ved = devm_kcalloc(vimc->mdev.dev, vimc->pipe_cfg->num_ents,
sizeof(*vimc->ved), GFP_KERNEL);
if (!vimc->ved)
return -ENOMEM;
/* Link the media device within the v4l2_device */
vimc->v4l2_dev.mdev = &vimc->mdev;
/* 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;
}
/* Initialize entities */
for (i = 0; i < vimc->pipe_cfg->num_ents; i++) {
struct vimc_ent_device *(*create_func)(struct v4l2_device *,
const char *const,
u16,
const unsigned long *);
/* Register the specific node */
switch (vimc->pipe_cfg->ents[i].node) {
case VIMC_ENT_NODE_SENSOR:
create_func = vimc_sen_create;
break;
case VIMC_ENT_NODE_CAPTURE:
create_func = vimc_cap_create;
break;
/* TODO: Instantiate the specific topology node */
case VIMC_ENT_NODE_INPUT:
case VIMC_ENT_NODE_DEBAYER:
case VIMC_ENT_NODE_SCALER:
default:
/*
* TODO: remove this when all the entities specific
* code are implemented
*/
create_func = vimc_raw_create;
break;
}
vimc->ved[i] = create_func(&vimc->v4l2_dev,
vimc->pipe_cfg->ents[i].name,
vimc->pipe_cfg->ents[i].pads_qty,
vimc->pipe_cfg->ents[i].pads_flag);
if (IS_ERR(vimc->ved[i])) {
ret = PTR_ERR(vimc->ved[i]);
vimc->ved[i] = NULL;
goto err;
}
}
/* 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];
ret = media_create_pad_link(vimc->ved[link->src_ent]->ent,
link->src_pad,
vimc->ved[link->sink_ent]->ent,
link->sink_pad,
link->flags);
if (ret)
goto err;
}
/* 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);
return ret;
}
/* 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;
}
return 0;
err:
/* Destroy the so far created topology */
vimc_device_unregister(vimc);
return ret;
}
static int vimc_probe(struct platform_device *pdev)
{
struct vimc_device *vimc;
int ret;
/* Prepare the vimc topology structure */
/* Allocate memory for the vimc structure */
vimc = kzalloc(sizeof(*vimc), GFP_KERNEL);
if (!vimc)
return -ENOMEM;
/* Set the pipeline configuration struct */
vimc->pipe_cfg = &pipe_cfg;
/* 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);
/* Create vimc topology */
ret = vimc_device_register(vimc);
if (ret) {
dev_err(vimc->mdev.dev,
"vimc device registration failed (err=%d)\n", ret);
kfree(vimc);
return ret;
}
/* Link the topology object with the platform device object */
platform_set_drvdata(pdev, vimc);
return 0;
}
static int vimc_remove(struct platform_device *pdev)
{
struct vimc_device *vimc = platform_get_drvdata(pdev);
/* Destroy all the topology */
vimc_device_unregister(vimc);
kfree(vimc);
return 0;
}
static void vimc_dev_release(struct device *dev)
{
}
static struct platform_device vimc_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_pdev);
if (ret) {
dev_err(&vimc_pdev.dev,
"platform device registration failed (err=%d)\n", ret);
return ret;
}
ret = platform_driver_register(&vimc_pdrv);
if (ret) {
dev_err(&vimc_pdev.dev,
"platform driver registration failed (err=%d)\n", ret);
platform_device_unregister(&vimc_pdev);
}
return ret;
}
static void __exit vimc_exit(void)
{
platform_driver_unregister(&vimc_pdrv);
platform_device_unregister(&vimc_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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