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[media] vimc: Virtual Media Controller core, capture and sensor 

First version of the Virtual Media Controller.
Add a simple version of the core of the driver, the capture and
sensor nodes in the topology, generating a grey image in a hardcoded
format.

Signed-off-by: Helen Koike <helen.koike@collabora.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
[hans.verkuil@cisco.com: fix small typo in Kconfig]

Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Helen Koike 2017-04-07 14:55:19 -03:00 committed by Mauro Carvalho Chehab
parent 3c2472a3c5
commit f2fe89061d
11 changed files with 1665 additions and 0 deletions
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8
MAINTAINERS
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@ -13407,6 +13407,14 @@ W: https://linuxtv.org
S: Maintained
F: drivers/media/platform/vivid/*
VIMC VIRTUAL MEDIA CONTROLLER DRIVER
M: Helen Koike <helen.koike@collabora.com>
L: linux-media@vger.kernel.org
T: git git://linuxtv.org/media_tree.git
W: https://linuxtv.org
S: Maintained
F: drivers/media/platform/vimc/*
VLYNQ BUS
M: Florian Fainelli <f.fainelli@gmail.com>
L: openwrt-devel@lists.openwrt.org (subscribers-only)

2
drivers/media/platform/Kconfig
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@ -495,6 +495,8 @@ menuconfig V4L_TEST_DRIVERS
if V4L_TEST_DRIVERS
source "drivers/media/platform/vimc/Kconfig"
source "drivers/media/platform/vivid/Kconfig"
config VIDEO_VIM2M

1
drivers/media/platform/Makefile
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@ -13,6 +13,7 @@ obj-$(CONFIG_VIDEO_PXA27x) += pxa_camera.o
obj-$(CONFIG_VIDEO_VIU) += fsl-viu.o
obj-$(CONFIG_VIDEO_VIMC) += vimc/
obj-$(CONFIG_VIDEO_VIVID) += vivid/
obj-$(CONFIG_VIDEO_VIM2M) += vim2m.o

14
drivers/media/platform/vimc/Kconfig Normal file
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@ -0,0 +1,14 @@
config VIDEO_VIMC
tristate "Virtual Media Controller Driver (VIMC)"
depends on VIDEO_DEV && VIDEO_V4L2 && VIDEO_V4L2_SUBDEV_API
select VIDEOBUF2_VMALLOC
default n
---help---
Skeleton driver for Virtual Media Controller
This driver can be compared to the vivid driver for emulating
a media node that exposes a complex media topology. The topology
is hard coded for now but is meant to be highly configurable in
the future.
When in doubt, say N.

3
drivers/media/platform/vimc/Makefile Normal file
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@ -0,0 +1,3 @@
vimc-objs := vimc-core.o vimc-capture.o vimc-sensor.o
obj-$(CONFIG_VIDEO_VIMC) += vimc.o

498
drivers/media/platform/vimc/vimc-capture.c Normal file
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@ -0,0 +1,498 @@
/*
* vimc-capture.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 <media/v4l2-ioctl.h>
#include <media/videobuf2-core.h>
#include <media/videobuf2-vmalloc.h>
#include "vimc-capture.h"
struct vimc_cap_device {
struct vimc_ent_device ved;
struct video_device vdev;
struct v4l2_pix_format format;
struct vb2_queue queue;
struct list_head buf_list;
/*
* NOTE: in a real driver, a spin lock must be used to access the
* queue because the frames are generated from a hardware interruption
* and the isr is not allowed to sleep.
* Even if it is not necessary a spinlock in the vimc driver, we
* use it here as a code reference
*/
spinlock_t qlock;
struct mutex lock;
u32 sequence;
struct media_pipeline pipe;
};
struct vimc_cap_buffer {
/*
* struct vb2_v4l2_buffer must be the first element
* the videobuf2 framework will allocate this struct based on
* buf_struct_size and use the first sizeof(struct vb2_buffer) bytes of
* memory as a vb2_buffer
*/
struct vb2_v4l2_buffer vb2;
struct list_head list;
};
static int vimc_cap_querycap(struct file *file, void *priv,
struct v4l2_capability *cap)
{
struct vimc_cap_device *vcap = video_drvdata(file);
strlcpy(cap->driver, KBUILD_MODNAME, sizeof(cap->driver));
strlcpy(cap->card, KBUILD_MODNAME, sizeof(cap->card));
snprintf(cap->bus_info, sizeof(cap->bus_info),
"platform:%s", vcap->vdev.v4l2_dev->name);
return 0;
}
static int vimc_cap_fmt_vid_cap(struct file *file, void *priv,
struct v4l2_format *f)
{
struct vimc_cap_device *vcap = video_drvdata(file);
f->fmt.pix = vcap->format;
return 0;
}
static int vimc_cap_enum_fmt_vid_cap(struct file *file, void *priv,
struct v4l2_fmtdesc *f)
{
struct vimc_cap_device *vcap = video_drvdata(file);
if (f->index > 0)
return -EINVAL;
/* We only support one format for now */
f->pixelformat = vcap->format.pixelformat;
return 0;
}
static const struct v4l2_file_operations vimc_cap_fops = {
.owner = THIS_MODULE,
.open = v4l2_fh_open,
.release = vb2_fop_release,
.read = vb2_fop_read,
.poll = vb2_fop_poll,
.unlocked_ioctl = video_ioctl2,
.mmap = vb2_fop_mmap,
};
static const struct v4l2_ioctl_ops vimc_cap_ioctl_ops = {
.vidioc_querycap = vimc_cap_querycap,
.vidioc_g_fmt_vid_cap = vimc_cap_fmt_vid_cap,
.vidioc_s_fmt_vid_cap = vimc_cap_fmt_vid_cap,
.vidioc_try_fmt_vid_cap = vimc_cap_fmt_vid_cap,
.vidioc_enum_fmt_vid_cap = vimc_cap_enum_fmt_vid_cap,
.vidioc_reqbufs = vb2_ioctl_reqbufs,
.vidioc_create_bufs = vb2_ioctl_create_bufs,
.vidioc_prepare_buf = vb2_ioctl_prepare_buf,
.vidioc_querybuf = vb2_ioctl_querybuf,
.vidioc_qbuf = vb2_ioctl_qbuf,
.vidioc_dqbuf = vb2_ioctl_dqbuf,
.vidioc_expbuf = vb2_ioctl_expbuf,
.vidioc_streamon = vb2_ioctl_streamon,
.vidioc_streamoff = vb2_ioctl_streamoff,
};
static void vimc_cap_return_all_buffers(struct vimc_cap_device *vcap,
enum vb2_buffer_state state)
{
struct vimc_cap_buffer *vbuf, *node;
spin_lock(&vcap->qlock);
list_for_each_entry_safe(vbuf, node, &vcap->buf_list, list) {
list_del(&vbuf->list);
vb2_buffer_done(&vbuf->vb2.vb2_buf, state);
}
spin_unlock(&vcap->qlock);
}
static int vimc_cap_pipeline_s_stream(struct vimc_cap_device *vcap, int enable)
{
struct v4l2_subdev *sd;
struct media_pad *pad;
int ret;
/* Start the stream in the subdevice direct connected */
pad = media_entity_remote_pad(&vcap->vdev.entity.pads[0]);
/*
* if it is a raw node from vimc-core, there is nothing to activate
* TODO: remove this when there are no more raw nodes in the
* core and return error instead
*/
if (pad->entity->obj_type == MEDIA_ENTITY_TYPE_BASE)
return 0;
sd = media_entity_to_v4l2_subdev(pad->entity);
ret = v4l2_subdev_call(sd, video, s_stream, enable);
if (ret && ret != -ENOIOCTLCMD)
return ret;
return 0;
}
static int vimc_cap_start_streaming(struct vb2_queue *vq, unsigned int count)
{
struct vimc_cap_device *vcap = vb2_get_drv_priv(vq);
struct media_entity *entity = &vcap->vdev.entity;
int ret;
vcap->sequence = 0;
/* Start the media pipeline */
ret = media_pipeline_start(entity, &vcap->pipe);
if (ret) {
vimc_cap_return_all_buffers(vcap, VB2_BUF_STATE_QUEUED);
return ret;
}
/* Enable streaming from the pipe */
ret = vimc_cap_pipeline_s_stream(vcap, 1);
if (ret) {
media_pipeline_stop(entity);
vimc_cap_return_all_buffers(vcap, VB2_BUF_STATE_QUEUED);
return ret;
}
return 0;
}
/*
* Stop the stream engine. Any remaining buffers in the stream queue are
* dequeued and passed on to the vb2 framework marked as STATE_ERROR.
*/
static void vimc_cap_stop_streaming(struct vb2_queue *vq)
{
struct vimc_cap_device *vcap = vb2_get_drv_priv(vq);
/* Disable streaming from the pipe */
vimc_cap_pipeline_s_stream(vcap, 0);
/* Stop the media pipeline */
media_pipeline_stop(&vcap->vdev.entity);
/* Release all active buffers */
vimc_cap_return_all_buffers(vcap, VB2_BUF_STATE_ERROR);
}
static void vimc_cap_buf_queue(struct vb2_buffer *vb2_buf)
{
struct vimc_cap_device *vcap = vb2_get_drv_priv(vb2_buf->vb2_queue);
struct vimc_cap_buffer *buf = container_of(vb2_buf,
struct vimc_cap_buffer,
vb2.vb2_buf);
spin_lock(&vcap->qlock);
list_add_tail(&buf->list, &vcap->buf_list);
spin_unlock(&vcap->qlock);
}
static int vimc_cap_queue_setup(struct vb2_queue *vq, unsigned int *nbuffers,
unsigned int *nplanes, unsigned int sizes[],
struct device *alloc_devs[])
{
struct vimc_cap_device *vcap = vb2_get_drv_priv(vq);
if (*nplanes)
return sizes[0] < vcap->format.sizeimage ? -EINVAL : 0;
/* We don't support multiplanes for now */
*nplanes = 1;
sizes[0] = vcap->format.sizeimage;
return 0;
}
static int vimc_cap_buffer_prepare(struct vb2_buffer *vb)
{
struct vimc_cap_device *vcap = vb2_get_drv_priv(vb->vb2_queue);
unsigned long size = vcap->format.sizeimage;
if (vb2_plane_size(vb, 0) < size) {
dev_err(vcap->vdev.v4l2_dev->dev,
"%s: buffer too small (%lu < %lu)\n",
vcap->vdev.name, vb2_plane_size(vb, 0), size);
return -EINVAL;
}
return 0;
}
static const struct vb2_ops vimc_cap_qops = {
.start_streaming = vimc_cap_start_streaming,
.stop_streaming = vimc_cap_stop_streaming,
.buf_queue = vimc_cap_buf_queue,
.queue_setup = vimc_cap_queue_setup,
.buf_prepare = vimc_cap_buffer_prepare,
/*
* Since q->lock is set we can use the standard
* vb2_ops_wait_prepare/finish helper functions.
*/
.wait_prepare = vb2_ops_wait_prepare,
.wait_finish = vb2_ops_wait_finish,
};
/*
* NOTE: this function is a copy of v4l2_subdev_link_validate_get_format
* maybe the v4l2 function should be public
*/
static int vimc_cap_v4l2_subdev_link_validate_get_format(struct media_pad *pad,
struct v4l2_subdev_format *fmt)
{
struct v4l2_subdev *sd = media_entity_to_v4l2_subdev(pad->entity);
fmt->which = V4L2_SUBDEV_FORMAT_ACTIVE;
fmt->pad = pad->index;
return v4l2_subdev_call(sd, pad, get_fmt, NULL, fmt);
}
static int vimc_cap_link_validate(struct media_link *link)
{
struct v4l2_subdev_format source_fmt;
const struct vimc_pix_map *vpix;
struct vimc_cap_device *vcap = container_of(link->sink->entity,
struct vimc_cap_device,
vdev.entity);
struct v4l2_pix_format *sink_fmt = &vcap->format;
int ret;
/*
* if it is a raw node from vimc-core, ignore the link for now
* TODO: remove this when there are no more raw nodes in the
* core and return error instead
*/
if (link->source->entity->obj_type == MEDIA_ENTITY_TYPE_BASE)
return 0;
/* Get the the format of the subdev */
ret = vimc_cap_v4l2_subdev_link_validate_get_format(link->source,
&source_fmt);
if (ret)
return ret;
dev_dbg(vcap->vdev.v4l2_dev->dev,
"%s: link validate formats src:%dx%d %d sink:%dx%d %d\n",
vcap->vdev.name,
source_fmt.format.width, source_fmt.format.height,
source_fmt.format.code,
sink_fmt->width, sink_fmt->height,
sink_fmt->pixelformat);
/* The width, height and code must match. */
vpix = vimc_pix_map_by_pixelformat(sink_fmt->pixelformat);
if (source_fmt.format.width != sink_fmt->width
|| source_fmt.format.height != sink_fmt->height
|| vpix->code != source_fmt.format.code)
return -EPIPE;
/*
* The field order must match, or the sink field order must be NONE
* to support interlaced hardware connected to bridges that support
* progressive formats only.
*/
if (source_fmt.format.field != sink_fmt->field &&
sink_fmt->field != V4L2_FIELD_NONE)
return -EPIPE;
return 0;
}
static const struct media_entity_operations vimc_cap_mops = {
.link_validate = vimc_cap_link_validate,
};
static void vimc_cap_destroy(struct vimc_ent_device *ved)
{
struct vimc_cap_device *vcap = container_of(ved, struct vimc_cap_device,
ved);
vb2_queue_release(&vcap->queue);
media_entity_cleanup(ved->ent);
video_unregister_device(&vcap->vdev);
vimc_pads_cleanup(vcap->ved.pads);
kfree(vcap);
}
static void vimc_cap_process_frame(struct vimc_ent_device *ved,
struct media_pad *sink, const void *frame)
{
struct vimc_cap_device *vcap = container_of(ved, struct vimc_cap_device,
ved);
struct vimc_cap_buffer *vimc_buf;
void *vbuf;
spin_lock(&vcap->qlock);
/* Get the first entry of the list */
vimc_buf = list_first_entry_or_null(&vcap->buf_list,
typeof(*vimc_buf), list);
if (!vimc_buf) {
spin_unlock(&vcap->qlock);
return;
}
/* Remove this entry from the list */
list_del(&vimc_buf->list);
spin_unlock(&vcap->qlock);
/* Fill the buffer */
vimc_buf->vb2.vb2_buf.timestamp = ktime_get_ns();
vimc_buf->vb2.sequence = vcap->sequence++;
vimc_buf->vb2.field = vcap->format.field;
vbuf = vb2_plane_vaddr(&vimc_buf->vb2.vb2_buf, 0);
memcpy(vbuf, frame, vcap->format.sizeimage);
/* Set it as ready */
vb2_set_plane_payload(&vimc_buf->vb2.vb2_buf, 0,
vcap->format.sizeimage);
vb2_buffer_done(&vimc_buf->vb2.vb2_buf, VB2_BUF_STATE_DONE);
}
struct vimc_ent_device *vimc_cap_create(struct v4l2_device *v4l2_dev,
const char *const name,
u16 num_pads,
const unsigned long *pads_flag)
{
const struct vimc_pix_map *vpix;
struct vimc_cap_device *vcap;
struct video_device *vdev;
struct vb2_queue *q;
int ret;
/*
* Check entity configuration params
* NOTE: we only support a single sink pad
*/
if (!name || num_pads != 1 || !pads_flag ||
!(pads_flag[0] & MEDIA_PAD_FL_SINK))
return ERR_PTR(-EINVAL);
/* Allocate the vimc_cap_device struct */
vcap = kzalloc(sizeof(*vcap), GFP_KERNEL);
if (!vcap)
return ERR_PTR(-ENOMEM);
/* Allocate the pads */
vcap->ved.pads = vimc_pads_init(num_pads, pads_flag);
if (IS_ERR(vcap->ved.pads)) {
ret = PTR_ERR(vcap->ved.pads);
goto err_free_vcap;
}
/* Initialize the media entity */
vcap->vdev.entity.name = name;
vcap->vdev.entity.function = MEDIA_ENT_F_IO_V4L;
ret = media_entity_pads_init(&vcap->vdev.entity,
num_pads, vcap->ved.pads);
if (ret)
goto err_clean_pads;
/* Initialize the lock */
mutex_init(&vcap->lock);
/* Initialize the vb2 queue */
q = &vcap->queue;
q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
q->io_modes = VB2_MMAP | VB2_DMABUF;
q->drv_priv = vcap;
q->buf_struct_size = sizeof(struct vimc_cap_buffer);
q->ops = &vimc_cap_qops;
q->mem_ops = &vb2_vmalloc_memops;
q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
q->min_buffers_needed = 2;
q->lock = &vcap->lock;
ret = vb2_queue_init(q);
if (ret) {
dev_err(vcap->vdev.v4l2_dev->dev,
"%s: vb2 queue init failed (err=%d)\n",
vcap->vdev.name, ret);
goto err_clean_m_ent;
}
/* Initialize buffer list and its lock */
INIT_LIST_HEAD(&vcap->buf_list);
spin_lock_init(&vcap->qlock);
/* Set the frame format (this is hardcoded for now) */
vcap->format.width = 640;
vcap->format.height = 480;
vcap->format.pixelformat = V4L2_PIX_FMT_RGB24;
vcap->format.field = V4L2_FIELD_NONE;
vcap->format.colorspace = V4L2_COLORSPACE_SRGB;
vpix = vimc_pix_map_by_pixelformat(vcap->format.pixelformat);
vcap->format.bytesperline = vcap->format.width * vpix->bpp;
vcap->format.sizeimage = vcap->format.bytesperline *
vcap->format.height;
/* Fill the vimc_ent_device struct */
vcap->ved.destroy = vimc_cap_destroy;
vcap->ved.ent = &vcap->vdev.entity;
vcap->ved.process_frame = vimc_cap_process_frame;
/* Initialize the video_device struct */
vdev = &vcap->vdev;
vdev->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
vdev->entity.ops = &vimc_cap_mops;
vdev->release = video_device_release_empty;
vdev->fops = &vimc_cap_fops;
vdev->ioctl_ops = &vimc_cap_ioctl_ops;
vdev->lock = &vcap->lock;
vdev->queue = q;
vdev->v4l2_dev = v4l2_dev;
vdev->vfl_dir = VFL_DIR_RX;
strlcpy(vdev->name, name, sizeof(vdev->name));
video_set_drvdata(vdev, &vcap->ved);
/* Register the video_device with the v4l2 and the media framework */
ret = video_register_device(vdev, VFL_TYPE_GRABBER, -1);
if (ret) {
dev_err(vcap->vdev.v4l2_dev->dev,
"%s: video register failed (err=%d)\n",
vcap->vdev.name, ret);
goto err_release_queue;
}
return &vcap->ved;
err_release_queue:
vb2_queue_release(q);
err_clean_m_ent:
media_entity_cleanup(&vcap->vdev.entity);
err_clean_pads:
vimc_pads_cleanup(vcap->ved.pads);
err_free_vcap:
kfree(vcap);
return ERR_PTR(ret);
}

28
drivers/media/platform/vimc/vimc-capture.h Normal file
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@ -0,0 +1,28 @@
/*
* vimc-capture.h 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.
*
*/
#ifndef _VIMC_CAPTURE_H_
#define _VIMC_CAPTURE_H_
#include "vimc-core.h"
struct vimc_ent_device *vimc_cap_create(struct v4l2_device *v4l2_dev,
const char *const name,
u16 num_pads,
const unsigned long *pads_flag);
#endif

695
drivers/media/platform/vimc/vimc-core.c Normal file
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@ -0,0 +1,695 @@
/*
* 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");

112
drivers/media/platform/vimc/vimc-core.h Normal file
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/*
* vimc-core.h 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.
*
*/
#ifndef _VIMC_CORE_H_
#define _VIMC_CORE_H_
#include <linux/slab.h>
#include <media/v4l2-device.h>
/**
* struct vimc_pix_map - maps media bus code with v4l2 pixel format
*
* @code: media bus format code defined by MEDIA_BUS_FMT_* macros
* @bbp: number of bytes each pixel occupies
* @pixelformat: pixel format devined by V4L2_PIX_FMT_* macros
*
* Struct which matches the MEDIA_BUS_FMT_* codes with the corresponding
* V4L2_PIX_FMT_* fourcc pixelformat and its bytes per pixel (bpp)
*/
struct vimc_pix_map {
unsigned int code;
unsigned int bpp;
u32 pixelformat;
};
/**
* struct vimc_ent_device - core struct that represents a node in the topology
*
* @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
*
* Each node of the topology must create a vimc_ent_device struct. Depending on
* the node it will be of an instance of v4l2_subdev or video_device struct
* where both contains a struct media_entity.
* Those structures should embedded the vimc_ent_device struct through
* v4l2_set_subdevdata() and video_set_drvdata() respectivaly, allowing the
* vimc_ent_device struct to be retrieved from the corresponding struct
* media_entity
*/
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);
};
/**
* vimc_propagate_frame - propagate a frame through the topology
*
* @src: the source pad where the frame is being originated
* @frame: the frame to be propagated
*
* This function will call the process_frame callback from the vimc_ent_device
* struct of the nodes directly connected to the @src pad
*/
int vimc_propagate_frame(struct media_pad *src, const void *frame);
/**
* vimc_pads_init - initialize pads
*
* @num_pads: number of pads to initialize
* @pads_flags: flags to use in each pad
*
* Helper functions to allocate/initialize pads
*/
struct media_pad *vimc_pads_init(u16 num_pads,
const unsigned long *pads_flag);
/**
* vimc_pads_cleanup - free pads
*
* @pads: pointer to the pads
*
* Helper function to free the pads initialized with vimc_pads_init
*/
static inline void vimc_pads_cleanup(struct media_pad *pads)
{
kfree(pads);
}
/**
* vimc_pix_map_by_code - get vimc_pix_map struct by media bus code
*
* @code: media bus format code defined by MEDIA_BUS_FMT_* macros
*/
const struct vimc_pix_map *vimc_pix_map_by_code(u32 code);
/**
* vimc_pix_map_by_pixelformat - get vimc_pix_map struct by v4l2 pixel format
*
* @pixelformat: pixel format devined by V4L2_PIX_FMT_* macros
*/
const struct vimc_pix_map *vimc_pix_map_by_pixelformat(u32 pixelformat);
#endif

276
drivers/media/platform/vimc/vimc-sensor.c Normal file
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/*
* vimc-sensor.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/freezer.h>
#include <linux/kthread.h>
#include <linux/v4l2-mediabus.h>
#include <linux/vmalloc.h>
#include <media/v4l2-subdev.h>
#include "vimc-sensor.h"
struct vimc_sen_device {
struct vimc_ent_device ved;
struct v4l2_subdev sd;
struct task_struct *kthread_sen;
u8 *frame;
/* The active format */
struct v4l2_mbus_framefmt mbus_format;
int frame_size;
};
static int vimc_sen_enum_mbus_code(struct v4l2_subdev *sd,
struct v4l2_subdev_pad_config *cfg,
struct v4l2_subdev_mbus_code_enum *code)
{
struct vimc_sen_device *vsen =
container_of(sd, struct vimc_sen_device, sd);
/* TODO: Add support for other codes */
if (code->index)
return -EINVAL;
code->code = vsen->mbus_format.code;
return 0;
}
static int vimc_sen_enum_frame_size(struct v4l2_subdev *sd,
struct v4l2_subdev_pad_config *cfg,
struct v4l2_subdev_frame_size_enum *fse)
{
struct vimc_sen_device *vsen =
container_of(sd, struct vimc_sen_device, sd);
/* TODO: Add support to other formats */
if (fse->index)
return -EINVAL;
/* TODO: Add support for other codes */
if (fse->code != vsen->mbus_format.code)
return -EINVAL;
fse->min_width = vsen->mbus_format.width;
fse->max_width = vsen->mbus_format.width;
fse->min_height = vsen->mbus_format.height;
fse->max_height = vsen->mbus_format.height;
return 0;
}
static int vimc_sen_get_fmt(struct v4l2_subdev *sd,
struct v4l2_subdev_pad_config *cfg,
struct v4l2_subdev_format *format)
{
struct vimc_sen_device *vsen =
container_of(sd, struct vimc_sen_device, sd);
format->format = vsen->mbus_format;
return 0;
}
static const struct v4l2_subdev_pad_ops vimc_sen_pad_ops = {
.enum_mbus_code = vimc_sen_enum_mbus_code,
.enum_frame_size = vimc_sen_enum_frame_size,
.get_fmt = vimc_sen_get_fmt,
/* TODO: Add support to other formats */
.set_fmt = vimc_sen_get_fmt,
};
/* media operations */
static const struct media_entity_operations vimc_sen_mops = {
.link_validate = v4l2_subdev_link_validate,
};
static int vimc_thread_sen(void *data)
{
struct vimc_sen_device *vsen = data;
unsigned int i;
set_freezable();
set_current_state(TASK_UNINTERRUPTIBLE);
for (;;) {
try_to_freeze();
if (kthread_should_stop())
break;
memset(vsen->frame, 100, vsen->frame_size);
/* Send the frame to all source pads */
for (i = 0; i < vsen->sd.entity.num_pads; i++)
vimc_propagate_frame(&vsen->sd.entity.pads[i],
vsen->frame);
/* 60 frames per second */
schedule_timeout(HZ/60);
}
return 0;
}
static int vimc_sen_s_stream(struct v4l2_subdev *sd, int enable)
{
struct vimc_sen_device *vsen =
container_of(sd, struct vimc_sen_device, sd);
int ret;
if (enable) {
const struct vimc_pix_map *vpix;
if (vsen->kthread_sen)
return -EINVAL;
/* Calculate the frame size */
vpix = vimc_pix_map_by_code(vsen->mbus_format.code);
vsen->frame_size = vsen->mbus_format.width * vpix->bpp *
vsen->mbus_format.height;
/*
* Allocate the frame buffer. Use vmalloc to be able to
* allocate a large amount of memory
*/
vsen->frame = vmalloc(vsen->frame_size);
if (!vsen->frame)
return -ENOMEM;
/* Initialize the image generator thread */
vsen->kthread_sen = kthread_run(vimc_thread_sen, vsen, "%s-sen",
vsen->sd.v4l2_dev->name);
if (IS_ERR(vsen->kthread_sen)) {
dev_err(vsen->sd.v4l2_dev->dev,
"%s: kernel_thread() failed\n", vsen->sd.name);
vfree(vsen->frame);
vsen->frame = NULL;
return PTR_ERR(vsen->kthread_sen);
}
} else {
if (!vsen->kthread_sen)
return -EINVAL;
/* Stop image generator */
ret = kthread_stop(vsen->kthread_sen);
vsen->kthread_sen = NULL;
vfree(vsen->frame);
vsen->frame = NULL;
return ret;
}
return 0;
}
struct v4l2_subdev_video_ops vimc_sen_video_ops = {
.s_stream = vimc_sen_s_stream,
};
static const struct v4l2_subdev_ops vimc_sen_ops = {
.pad = &vimc_sen_pad_ops,
.video = &vimc_sen_video_ops,
};
static void vimc_sen_destroy(struct vimc_ent_device *ved)
{
struct vimc_sen_device *vsen =
container_of(ved, struct vimc_sen_device, ved);
v4l2_device_unregister_subdev(&vsen->sd);
media_entity_cleanup(ved->ent);
kfree(vsen);
}
struct vimc_ent_device *vimc_sen_create(struct v4l2_device *v4l2_dev,
const char *const name,
u16 num_pads,
const unsigned long *pads_flag)
{
struct vimc_sen_device *vsen;
unsigned int i;
int ret;
/* NOTE: a sensor node may be created with more then one pad */
if (!name || !num_pads || !pads_flag)
return ERR_PTR(-EINVAL);
/* check if all pads are sources */
for (i = 0; i < num_pads; i++)
if (!(pads_flag[i] & MEDIA_PAD_FL_SOURCE))
return ERR_PTR(-EINVAL);
/* Allocate the vsen struct */
vsen = kzalloc(sizeof(*vsen), GFP_KERNEL);
if (!vsen)
return ERR_PTR(-ENOMEM);
/* Allocate the pads */
vsen->ved.pads = vimc_pads_init(num_pads, pads_flag);
if (IS_ERR(vsen->ved.pads)) {
ret = PTR_ERR(vsen->ved.pads);
goto err_free_vsen;
}
/* Fill the vimc_ent_device struct */
vsen->ved.destroy = vimc_sen_destroy;
vsen->ved.ent = &vsen->sd.entity;
/* Initialize the subdev */
v4l2_subdev_init(&vsen->sd, &vimc_sen_ops);
vsen->sd.entity.function = MEDIA_ENT_F_CAM_SENSOR;
vsen->sd.entity.ops = &vimc_sen_mops;
vsen->sd.owner = THIS_MODULE;
strlcpy(vsen->sd.name, name, sizeof(vsen->sd.name));
v4l2_set_subdevdata(&vsen->sd, &vsen->ved);
/* Expose this subdev to user space */
vsen->sd.flags = V4L2_SUBDEV_FL_HAS_DEVNODE;
/* Initialize the media entity */
ret = media_entity_pads_init(&vsen->sd.entity,
num_pads, vsen->ved.pads);
if (ret)
goto err_clean_pads;
/* Set the active frame format (this is hardcoded for now) */
vsen->mbus_format.width = 640;
vsen->mbus_format.height = 480;
vsen->mbus_format.code = MEDIA_BUS_FMT_RGB888_1X24;
vsen->mbus_format.field = V4L2_FIELD_NONE;
vsen->mbus_format.colorspace = V4L2_COLORSPACE_SRGB;
vsen->mbus_format.quantization = V4L2_QUANTIZATION_FULL_RANGE;
vsen->mbus_format.xfer_func = V4L2_XFER_FUNC_SRGB;
/* Register the subdev with the v4l2 and the media framework */
ret = v4l2_device_register_subdev(v4l2_dev, &vsen->sd);
if (ret) {
dev_err(vsen->sd.v4l2_dev->dev,
"%s: subdev register failed (err=%d)\n",
vsen->sd.name, ret);
goto err_clean_m_ent;
}
return &vsen->ved;
err_clean_m_ent:
media_entity_cleanup(&vsen->sd.entity);
err_clean_pads:
vimc_pads_cleanup(vsen->ved.pads);
err_free_vsen:
kfree(vsen);
return ERR_PTR(ret);
}

28
drivers/media/platform/vimc/vimc-sensor.h Normal file
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@ -0,0 +1,28 @@
/*
* vimc-sensor.h 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.
*
*/
#ifndef _VIMC_SENSOR_H_
#define _VIMC_SENSOR_H_
#include "vimc-core.h"
struct vimc_ent_device *vimc_sen_create(struct v4l2_device *v4l2_dev,
const char *const name,
u16 num_pads,
const unsigned long *pads_flag);
#endif