Hi,
On Wed, Apr 6, 2016 at 5:20 PM, Helen Mae Koike Fornazier
<helen.koike@xxxxxxxxxxxxxxx> wrote:
> From: Helen Fornazier <helen.fornazier@xxxxxxxxx>
>
> 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 Fornazier <helen.fornazier@xxxxxxxxx>
> ---
>
> Changes since v2: update with current media master tree
> - Add struct media_pipeline in vimc_cap_device
> - Use vb2_v4l2_buffer instead of vb2_buffer
> - Typos
> - Remove usage of entity->type and use entity->function instead
> - Remove fmt argument from queue setup
> - Use ktime_get_ns instead of v4l2_get_timestamp
> - Iterate over link's list using list_for_each_entry
> - Use media_device_{init, cleanup}
> - Use entity->use_count to keep track of entities instead of the old
> entity->id
> - Replace media_entity_init by media_entity_pads_init
>
> drivers/media/platform/Kconfig | 2 +
> drivers/media/platform/Makefile | 1 +
> drivers/media/platform/vimc/Kconfig | 6 +
> drivers/media/platform/vimc/Makefile | 3 +
> drivers/media/platform/vimc/vimc-capture.c | 534 ++++++++++++++++++++++++++
> drivers/media/platform/vimc/vimc-capture.h | 28 ++
> drivers/media/platform/vimc/vimc-core.c | 595 +++++++++++++++++++++++++++++
> drivers/media/platform/vimc/vimc-core.h | 55 +++
> drivers/media/platform/vimc/vimc-sensor.c | 277 ++++++++++++++
> drivers/media/platform/vimc/vimc-sensor.h | 28 ++
> 10 files changed, 1529 insertions(+)
> create mode 100644 drivers/media/platform/vimc/Kconfig
> create mode 100644 drivers/media/platform/vimc/Makefile
> create mode 100644 drivers/media/platform/vimc/vimc-capture.c
> create mode 100644 drivers/media/platform/vimc/vimc-capture.h
> create mode 100644 drivers/media/platform/vimc/vimc-core.c
> create mode 100644 drivers/media/platform/vimc/vimc-core.h
> create mode 100644 drivers/media/platform/vimc/vimc-sensor.c
> create mode 100644 drivers/media/platform/vimc/vimc-sensor.h
>
> diff --git a/drivers/media/platform/Kconfig b/drivers/media/platform/Kconfig
> index 201f5c2..14ed03f 100644
> --- a/drivers/media/platform/Kconfig
> +++ b/drivers/media/platform/Kconfig
> @@ -284,6 +284,8 @@ menuconfig V4L_TEST_DRIVERS
>
> if V4L_TEST_DRIVERS
>
> +source "drivers/media/platform/vimc/Kconfig"
> +
> source "drivers/media/platform/vivid/Kconfig"
>
> config VIDEO_VIM2M
> diff --git a/drivers/media/platform/Makefile b/drivers/media/platform/Makefile
> index bbb7bd1..e4508fe 100644
> --- a/drivers/media/platform/Makefile
> +++ b/drivers/media/platform/Makefile
> @@ -12,6 +12,7 @@ obj-$(CONFIG_VIDEO_OMAP3) += omap3isp/
>
> obj-$(CONFIG_VIDEO_VIU) += fsl-viu.o
>
> +obj-$(CONFIG_VIDEO_VIMC) += vimc/
> obj-$(CONFIG_VIDEO_VIVID) += vivid/
> obj-$(CONFIG_VIDEO_VIM2M) += vim2m.o
>
> diff --git a/drivers/media/platform/vimc/Kconfig b/drivers/media/platform/vimc/Kconfig
> new file mode 100644
> index 0000000..81279f4
> --- /dev/null
> +++ b/drivers/media/platform/vimc/Kconfig
> @@ -0,0 +1,6 @@
> +config VIDEO_VIMC
> + tristate "Virtual Media Controller Driver (VIMC)"
> + select VIDEO_V4L2_SUBDEV_API
> + default n
> + ---help---
> + Skeleton driver for Virtual Media Controller
> diff --git a/drivers/media/platform/vimc/Makefile b/drivers/media/platform/vimc/Makefile
> new file mode 100644
> index 0000000..c45195e
> --- /dev/null
> +++ b/drivers/media/platform/vimc/Makefile
> @@ -0,0 +1,3 @@
> +vimc-objs := vimc-core.o vimc-capture.o vimc-sensor.o
> +
> +obj-$(CONFIG_VIDEO_VIMC) += vimc.o
> diff --git a/drivers/media/platform/vimc/vimc-capture.c b/drivers/media/platform/vimc/vimc-capture.c
> new file mode 100644
> index 0000000..3fb8bfe
> --- /dev/null
> +++ b/drivers/media/platform/vimc/vimc-capture.c
> @@ -0,0 +1,534 @@
> +/*
> + * vimc-capture.c Virtual Media Controller Driver
> + *
> + * Copyright (C) 2015 Helen Fornazier <helen.fornazier@xxxxxxxxx>
> + *
> + * 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/videobuf2-core.h>
> +#include <media/videobuf2-vmalloc.h>
> +#include <media/v4l2-ioctl.h>
> +
> +#include "vimc-capture.h"
> +
> +struct vimc_cap_device {
> + struct vimc_ent_device ved;
> + struct video_device vdev;
> + struct v4l2_device *v4l2_dev;
> + struct device *dev;
> + 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 {
> + /*
> + * vb2_buffer must be the first element
> + * the videobf2 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->v4l2_dev->name);
> +
> + cap->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
> + cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;
> +
> + return 0;
> +}
> +
> +static int vimc_cap_enum_input(struct file *file, void *priv,
> + struct v4l2_input *i)
> +{
> + /* We only have one input */
> + if (i->index > 0)
> + return -EINVAL;
> +
> + i->type = V4L2_INPUT_TYPE_CAMERA;
> + strlcpy(i->name, "VIMC capture", sizeof(i->name));
> +
> + return 0;
> +}
> +
> +static int vimc_cap_g_input(struct file *file, void *priv, unsigned int *i)
> +{
> + /* We only have one input */
> + *i = 0;
> + return 0;
> +}
> +
> +static int vimc_cap_s_input(struct file *file, void *priv, unsigned int i)
> +{
> + /* We only have one input */
> + return i ? -EINVAL : 0;
> +}
> +
> +static int vimc_cap_g_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_enum_input = vimc_cap_enum_input,
> + .vidioc_g_input = vimc_cap_g_input,
> + .vidioc_s_input = vimc_cap_s_input,
> +
> + .vidioc_g_fmt_vid_cap = vimc_cap_g_fmt_vid_cap,
> + .vidioc_s_fmt_vid_cap = vimc_cap_g_fmt_vid_cap,
> + .vidioc_try_fmt_vid_cap = vimc_cap_g_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_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) {
> + vb2_buffer_done(&vbuf->vb2.vb2_buf, state);
> + list_del(&vbuf->list);
> + }
> +
> + spin_unlock(&vcap->qlock);
> +}
> +
> +static int vimc_cap_pipeline_s_stream(struct vimc_cap_device *vcap, int enable)
> +{
> + int ret;
> + struct media_pad *pad;
> + struct media_entity *entity;
> + struct v4l2_subdev *sd;
> +
> + /* Start the stream in the subdevice direct connected */
> + entity = &vcap->vdev.entity;
> + pad = media_entity_remote_pad(&entity->pads[0]);
> +
> + /* If we are not connected to any subdev node, it means there is nothing
> + * to activate on the pipe (e.g. we can be connected with an input
> + * device or we are not connected at all)
> + */
> + if (pad == NULL || !is_media_entity_v4l2_subdev(pad->entity))
> + return 0;
> +
> + entity = pad->entity;
> + sd = media_entity_to_v4l2_subdev(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;
> + int ret;
> +
> + vcap->sequence = 0;
> +
> + /* Start the media pipeline */
> + entity = &vcap->vdev.entity;
> + ret = media_entity_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) {
> + 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_entity_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);
> +
> + /* If the buffer doesn't have enough size, mark it as error */
> + if (vb2_buf->planes[0].length < vcap->format.sizeimage) {
> + vb2_buffer_done(vb2_buf, VB2_BUF_STATE_ERROR);
> + return;
> + }
> +
> + 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[], void *alloc_ctxs[])
> +{
> + struct vimc_cap_device *vcap = vb2_get_drv_priv(vq);
> +
> + /* We don't support multiplanes for now */
> + *nplanes = 1;
> + sizes[0] = vcap->format.sizeimage;
> +
> + 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,
> + /*
> + * 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;
> + struct v4l2_pix_format *sink_fmt;
> + struct vimc_cap_device *vcap;
> + const struct vimc_pix_map *vpix;
> + int ret;
> +
> + /* Retrieve the video capture device */
> + vcap = container_of(link->sink->entity,
> + struct vimc_cap_device, vdev.entity);
> +
> + /* If the connected node is not a subdevice type
> + * then it's 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 (!is_media_entity_v4l2_subdev(link->source->entity))
> + return 0;
> +
> + /* Get the the format of the video device */
> + sink_fmt = &vcap->format;
> +
> + /* 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->dev,
> + "cap: %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);
> +
> + /* Validate the format */
> +
> + vpix = vimc_pix_map_by_pixelformat(sink_fmt->pixelformat);
> + if (!vpix)
> + return -EINVAL;
> +
> + /* The width, height and code must match. */
> + if (source_fmt.format.width != sink_fmt->width
> + || source_fmt.format.height != sink_fmt->height
> + || vpix->code != source_fmt.format.code)
> + return -EINVAL;
> +
> + /* 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 -EINVAL;
> +
> + 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;
> +
> + /* If the stream in this node is not active, just return */
> + mutex_lock(&vcap->lock);
> + if (!vb2_is_busy(&vcap->queue)) {
> + mutex_unlock(&vcap->lock);
> + return;
> + }
> + mutex_unlock(&vcap->lock);
> +
> + 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)
> +{
> + int ret;
> + struct vb2_queue *q;
> + struct video_device *vdev;
> + struct vimc_cap_device *vcap;
> + const struct vimc_pix_map *vpix;
> +
> + if (!v4l2_dev || !v4l2_dev->dev || !name || (num_pads && !pads_flag))
> + return ERR_PTR(-EINVAL);
> +
> + /* Allocate the vimc_cap_device struct */
> + vcap = kzalloc(sizeof(*vcap), GFP_KERNEL);
> + if (!vcap)
> + return ERR_PTR(-ENOMEM);
> +
> + /* Link the vimc_cap_device struct with v4l2 and dev parent */
> + vcap->v4l2_dev = v4l2_dev;
> + vcap->dev = v4l2_dev->dev;
> +
> + /* 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->dev,
> + "vb2 queue init failed (err=%d)\n", 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);
> + /* This should never be NULL, as we won't allow any format
> + * other then the ones in the vimc_pix_map_list table */
> + BUG_ON(!vpix);
> +
> + 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->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 = vcap->v4l2_dev;
> + vdev->vfl_dir = VFL_DIR_RX;
> + strlcpy(vdev->name, name, sizeof(vdev->name));
> + video_set_drvdata(vdev, vcap);
> +
> + /* 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->dev,
> + "video register failed (err=%d)\n", 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);
> +}
> diff --git a/drivers/media/platform/vimc/vimc-capture.h b/drivers/media/platform/vimc/vimc-capture.h
> new file mode 100644
> index 0000000..c52781a
> --- /dev/null
> +++ b/drivers/media/platform/vimc/vimc-capture.h
> @@ -0,0 +1,28 @@
> +/*
> + * vimc-capture.h Virtual Media Controller Driver
> + *
> + * Copyright (C) 2015 Helen Fornazier <helen.fornazier@xxxxxxxxx>
> + *
> + * 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
> diff --git a/drivers/media/platform/vimc/vimc-core.c b/drivers/media/platform/vimc/vimc-core.c
> new file mode 100644
> index 0000000..04c5297
> --- /dev/null
> +++ b/drivers/media/platform/vimc/vimc-core.c
> @@ -0,0 +1,595 @@
> +/*
> + * vimc-core.c Virtual Media Controller Driver
> + *
> + * Copyright (C) 2015 Helen Fornazier <helen.fornazier@xxxxxxxxx>
> + *
> + * 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 <linux/slab.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, \
> +}
> +
> +#define VIMC_PIX_MAP(_code, _bpp, _pixelformat) { \
> + .code = _code, \
> + .pixelformat = _pixelformat, \
> + .bpp = _bpp, \
> +}
> +
> +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 void vimc_dev_release(struct device *dev)
> +{}
> +
> +static struct platform_device vimc_pdev = {
> + .name = VIMC_PDEV_NAME,
> + .dev.release = vimc_dev_release,
> +};
> +
> +const struct vimc_pix_map vimc_pix_map_list[] = {
> + /* TODO: add all missing formats */
> +
> + /* RGB formats */
> + VIMC_PIX_MAP(MEDIA_BUS_FMT_BGR888_1X24, 3, V4L2_PIX_FMT_BGR24),
> + VIMC_PIX_MAP(MEDIA_BUS_FMT_RGB888_1X24, 3, V4L2_PIX_FMT_RGB24),
> + VIMC_PIX_MAP(MEDIA_BUS_FMT_ARGB8888_1X32, 4, V4L2_PIX_FMT_ARGB32),
> +
> + /* Bayer formats */
> + VIMC_PIX_MAP(MEDIA_BUS_FMT_SBGGR8_1X8, 1, V4L2_PIX_FMT_SBGGR8),
> + VIMC_PIX_MAP(MEDIA_BUS_FMT_SGBRG8_1X8, 1, V4L2_PIX_FMT_SGBRG8),
> + VIMC_PIX_MAP(MEDIA_BUS_FMT_SGRBG8_1X8, 1, V4L2_PIX_FMT_SGRBG8),
> + VIMC_PIX_MAP(MEDIA_BUS_FMT_SRGGB8_1X8, 1, V4L2_PIX_FMT_SRGGB8),
> + VIMC_PIX_MAP(MEDIA_BUS_FMT_SBGGR10_1X10, 2, V4L2_PIX_FMT_SBGGR10),
> + VIMC_PIX_MAP(MEDIA_BUS_FMT_SGBRG10_1X10, 2, V4L2_PIX_FMT_SGBRG10),
> + VIMC_PIX_MAP(MEDIA_BUS_FMT_SGRBG10_1X10, 2, V4L2_PIX_FMT_SGRBG10),
> + VIMC_PIX_MAP(MEDIA_BUS_FMT_SRGGB10_1X10, 2, V4L2_PIX_FMT_SRGGB10),
> + /* 10bit raw bayer a-law compressed to 8 bits */
> + VIMC_PIX_MAP(MEDIA_BUS_FMT_SBGGR10_ALAW8_1X8, 1, V4L2_PIX_FMT_SBGGR10ALAW8),
> + VIMC_PIX_MAP(MEDIA_BUS_FMT_SGBRG10_ALAW8_1X8, 1, V4L2_PIX_FMT_SGBRG10ALAW8),
> + VIMC_PIX_MAP(MEDIA_BUS_FMT_SGRBG10_ALAW8_1X8, 1, V4L2_PIX_FMT_SGRBG10ALAW8),
> + VIMC_PIX_MAP(MEDIA_BUS_FMT_SRGGB10_ALAW8_1X8, 1, V4L2_PIX_FMT_SRGGB10ALAW8),
> + /* 10bit raw bayer DPCM compressed to 8 bits */
> + VIMC_PIX_MAP(MEDIA_BUS_FMT_SBGGR10_DPCM8_1X8, 1, V4L2_PIX_FMT_SBGGR10DPCM8),
> + VIMC_PIX_MAP(MEDIA_BUS_FMT_SGBRG10_DPCM8_1X8, 1, V4L2_PIX_FMT_SGBRG10DPCM8),
> + VIMC_PIX_MAP(MEDIA_BUS_FMT_SGRBG10_DPCM8_1X8, 1, V4L2_PIX_FMT_SGRBG10DPCM8),
> + VIMC_PIX_MAP(MEDIA_BUS_FMT_SRGGB10_DPCM8_1X8, 1, V4L2_PIX_FMT_SRGGB10DPCM8),
> + VIMC_PIX_MAP(MEDIA_BUS_FMT_SBGGR12_1X12, 2, V4L2_PIX_FMT_SBGGR12),
> + VIMC_PIX_MAP(MEDIA_BUS_FMT_SGBRG12_1X12, 2, V4L2_PIX_FMT_SGBRG12),
> + VIMC_PIX_MAP(MEDIA_BUS_FMT_SGRBG12_1X12, 2, V4L2_PIX_FMT_SGRBG12),
> + VIMC_PIX_MAP(MEDIA_BUS_FMT_SRGGB12_1X12, 2, V4L2_PIX_FMT_SRGGB12),
> +
> + /* End */
> + {0, 0, 0}
> +};
> +
> +const struct vimc_pix_map *vimc_pix_map_by_code(u32 code)
> +{
> + unsigned int i;
> +
> + for (i = 0; vimc_pix_map_list[i].bpp; 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; vimc_pix_map_list[i].bpp; i++) {
> + if (vimc_pix_map_list[i].pixelformat == pixelformat)
> + return &vimc_pix_map_list[i];
> + }
> + return NULL;
> +}
> +
> +int vimc_propagate_frame(struct device *dev,
> + struct media_pad *src, const void *frame)
> +{
> + struct media_link *link;
> + struct vimc_device *vimc = dev_get_drvdata(dev);
> +
> + 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;
> +
> + ved = vimc->ved[link->sink->entity->use_count];
> + 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;
> +
> + v4l2_device_unregister(&vimc->v4l2_dev);
> +
> + media_device_unregister(&vimc->mdev);
> + media_device_cleanup(&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;
> + }
> +}
> +
> +/* Helper function to allocate and initialize pads */
> +struct media_pad *vimc_pads_init(u16 num_pads, const unsigned long *pads_flag)
> +{
> + unsigned int i;
> + struct media_pad *pads;
> +
> + /* 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_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)
> +{
> + int ret;
> + struct vimc_ent_device *ved;
> +
> + /* 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_IO_V4L;
> + 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 = 0;
> +
> + /* 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;
> +
> + /* 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;
> + }
> +
> + /* 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;
> + }
> +
> + /* Set use_count to keep track of the ved structure */
> + vimc->ved[i]->ent->use_count = i;
> + }
> +
> + /* 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;
> + }
> +
> + /* 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 de 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 = devm_kzalloc(&pdev->dev, 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);
> + 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;
> +
> + /* Get the topology object linked with the platform device object */
> + vimc = platform_get_drvdata(pdev);
> +
> + /* Destroy all the topology */
> + vimc_device_unregister(vimc);
> +
> + return 0;
> +}
> +
> +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@xxxxxxxxx>");
> +MODULE_LICENSE("GPL");
> diff --git a/drivers/media/platform/vimc/vimc-core.h b/drivers/media/platform/vimc/vimc-core.h
> new file mode 100644
> index 0000000..be05469
> --- /dev/null
> +++ b/drivers/media/platform/vimc/vimc-core.h
> @@ -0,0 +1,55 @@
> +/*
> + * vimc-core.h Virtual Media Controller Driver
> + *
> + * Copyright (C) 2015 Helen Fornazier <helen.fornazier@xxxxxxxxx>
> + *
> + * 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 <media/v4l2-device.h>
> +
> +/* 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;
> +};
> +extern const struct vimc_pix_map vimc_pix_map_list[];
> +
> +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);
> +};
> +
> +int vimc_propagate_frame(struct device *dev,
> + struct media_pad *src, const void *frame);
> +
> +/* Helper functions to allocate/initialize pads and free them */
> +struct media_pad *vimc_pads_init(u16 num_pads,
> + const unsigned long *pads_flag);
> +static inline void vimc_pads_cleanup(struct media_pad *pads)
> +{
> + kfree(pads);
> +}
> +
> +const struct vimc_pix_map *vimc_pix_map_by_code(u32 code);
> +
> +const struct vimc_pix_map *vimc_pix_map_by_pixelformat(u32 pixelformat);
> +
> +#endif
> diff --git a/drivers/media/platform/vimc/vimc-sensor.c b/drivers/media/platform/vimc/vimc-sensor.c
> new file mode 100644
> index 0000000..ae70b9e
> --- /dev/null
> +++ b/drivers/media/platform/vimc/vimc-sensor.c
> @@ -0,0 +1,277 @@
> +/*
> + * vimc-sensor.c Virtual Media Controller Driver
> + *
> + * Copyright (C) 2015 Helen Fornazier <helen.fornazier@xxxxxxxxx>
> + *
> + * 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/vmalloc.h>
> +#include <linux/v4l2-mediabus.h>
> +#include <media/v4l2-subdev.h>
> +
> +#include "vimc-sensor.h"
> +
> +struct vimc_sen_device {
> + struct vimc_ent_device ved;
> + struct v4l2_subdev sd;
> + struct v4l2_device *v4l2_dev;
> + struct device *dev;
> + 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 = v4l2_get_subdevdata(sd);
> +
> + /* Check if it is a valid pad */
> + if (code->pad >= vsen->sd.entity.num_pads)
> + 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 = v4l2_get_subdevdata(sd);
> +
> + /* Check if it is a valid pad */
> + if (fse->pad >= vsen->sd.entity.num_pads ||
> + !(vsen->sd.entity.pads[fse->pad].flags & MEDIA_PAD_FL_SOURCE))
> + return -EINVAL;
> +
> + /* 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 = v4l2_get_subdevdata(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)
> +{
> + unsigned int i;
> + struct vimc_sen_device *vsen = data;
> +
> + set_freezable();
> +
> + 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++)
> + if (vsen->sd.entity.pads[i].flags & MEDIA_PAD_FL_SOURCE)
> + vimc_propagate_frame(vsen->dev,
> + &vsen->sd.entity.pads[i],
> + vsen->frame);
> +
> + /* Wait one second */
> + schedule_timeout_interruptible(HZ);
> + }
> +
> + return 0;
> +}
> +
> +static int vimc_sen_s_stream(struct v4l2_subdev *sd, int enable)
> +{
> + int ret;
> + struct vimc_sen_device *vsen = v4l2_get_subdevdata(sd);
> +
> + 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);
> + /* This should never be NULL, as we won't allow any format
> + * other then the ones in the vimc_pix_map_list table */
> + BUG_ON(!vpix);
> + 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->v4l2_dev->name);
> + if (IS_ERR(vsen->kthread_sen)) {
> + v4l2_err(vsen->v4l2_dev, "kernel_thread() failed\n");
> + 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);
> +
> + media_entity_cleanup(ved->ent);
> + v4l2_device_unregister_subdev(&vsen->sd);
> + 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)
> +{
> + int ret;
> + struct vimc_sen_device *vsen;
> +
> + if (!v4l2_dev || !v4l2_dev->dev || !name || (num_pads && !pads_flag))
> + return ERR_PTR(-EINVAL);
> +
> + /* Allocate the vsen struct */
> + vsen = kzalloc(sizeof(*vsen), GFP_KERNEL);
> + if (!vsen)
> + return ERR_PTR(-ENOMEM);
> +
> + /* Link the vimc_sen_device struct with the v4l2 parent */
> + vsen->v4l2_dev = v4l2_dev;
> + /* Link the vimc_sen_device struct with the dev parent */
> + vsen->dev = v4l2_dev->dev;
> +
> + /* 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;
> + }
> +
> + /* Initialize the media entity */
> + vsen->sd.entity.name = name;
> + vsen->sd.entity.function = MEDIA_ENT_F_CAM_SENSOR;
> + 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;
> +
> + /* 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.ops = &vimc_sen_mops;
> + vsen->sd.owner = THIS_MODULE;
> + strlcpy(vsen->sd.name, name, sizeof(vsen->sd.name));
> + v4l2_set_subdevdata(&vsen->sd, vsen);
> +
> + /* Expose this subdev to user space */
> + vsen->sd.flags = V4L2_SUBDEV_FL_HAS_DEVNODE;
> +
> + /* Register the subdev with the v4l2 and the media framework */
> + ret = v4l2_device_register_subdev(vsen->v4l2_dev, &vsen->sd);
> + if (ret) {
> + dev_err(vsen->dev,
> + "subdev register failed (err=%d)\n", 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);
> +}
> diff --git a/drivers/media/platform/vimc/vimc-sensor.h b/drivers/media/platform/vimc/vimc-sensor.h
> new file mode 100644
> index 0000000..67b7e07
> --- /dev/null
> +++ b/drivers/media/platform/vimc/vimc-sensor.h
> @@ -0,0 +1,28 @@
> +/*
> + * vimc-sensor.h Virtual Media Controller Driver
> + *
> + * Copyright (C) 2015 Helen Fornazier <helen.fornazier@xxxxxxxxx>
> + *
> + * 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
> --
> 1.9.1
>
I know everybody is busy, but is there any chance for this patch to be
reviewed or to get some comments/feedback on it?
--
Helen Fornazier
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