linux_dsm_epyc7002/drivers/media/platform/vimc/vimc-capture.c
Helen Koike f2fe89061d [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>
2017-04-14 23:05:13 -03:00

499 lines
14 KiB
C

/*
* 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);
}