blob: 8e014cc485f002ef8555794a4fa182f1f4e634e0 [file] [log] [blame]
/*
* 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 <linux/component.h>
#include <linux/module.h>
#include <linux/mod_devicetable.h>
#include <linux/platform_device.h>
#include <media/v4l2-ioctl.h>
#include <media/videobuf2-core.h>
#include <media/videobuf2-vmalloc.h>
#include "vimc-common.h"
#include "vimc-streamer.h"
#define VIMC_CAP_DRV_NAME "vimc-capture"
struct vimc_cap_device {
struct vimc_ent_device ved;
struct video_device vdev;
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 vimc_stream stream;
};
static const struct v4l2_pix_format fmt_default = {
.width = 640,
.height = 480,
.pixelformat = V4L2_PIX_FMT_RGB24,
.field = V4L2_FIELD_NONE,
.colorspace = V4L2_COLORSPACE_DEFAULT,
};
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 void vimc_cap_get_format(struct vimc_ent_device *ved,
struct v4l2_pix_format *fmt)
{
struct vimc_cap_device *vcap = container_of(ved, struct vimc_cap_device,
ved);
*fmt = vcap->format;
}
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_try_fmt_vid_cap(struct file *file, void *priv,
struct v4l2_format *f)
{
struct v4l2_pix_format *format = &f->fmt.pix;
const struct vimc_pix_map *vpix;
format->width = clamp_t(u32, format->width, VIMC_FRAME_MIN_WIDTH,
VIMC_FRAME_MAX_WIDTH) & ~1;
format->height = clamp_t(u32, format->height, VIMC_FRAME_MIN_HEIGHT,
VIMC_FRAME_MAX_HEIGHT) & ~1;
/* Don't accept a pixelformat that is not on the table */
vpix = vimc_pix_map_by_pixelformat(format->pixelformat);
if (!vpix) {
format->pixelformat = fmt_default.pixelformat;
vpix = vimc_pix_map_by_pixelformat(format->pixelformat);
}
/* TODO: Add support for custom bytesperline values */
format->bytesperline = format->width * vpix->bpp;
format->sizeimage = format->bytesperline * format->height;
if (format->field == V4L2_FIELD_ANY)
format->field = fmt_default.field;
vimc_colorimetry_clamp(format);
return 0;
}
static int vimc_cap_s_fmt_vid_cap(struct file *file, void *priv,
struct v4l2_format *f)
{
struct vimc_cap_device *vcap = video_drvdata(file);
int ret;
/* Do not change the format while stream is on */
if (vb2_is_busy(&vcap->queue))
return -EBUSY;
ret = vimc_cap_try_fmt_vid_cap(file, priv, f);
if (ret)
return ret;
dev_dbg(vcap->dev, "%s: format update: "
"old:%dx%d (0x%x, %d, %d, %d, %d) "
"new:%dx%d (0x%x, %d, %d, %d, %d)\n", vcap->vdev.name,
/* old */
vcap->format.width, vcap->format.height,
vcap->format.pixelformat, vcap->format.colorspace,
vcap->format.quantization, vcap->format.xfer_func,
vcap->format.ycbcr_enc,
/* new */
f->fmt.pix.width, f->fmt.pix.height,
f->fmt.pix.pixelformat, f->fmt.pix.colorspace,
f->fmt.pix.quantization, f->fmt.pix.xfer_func,
f->fmt.pix.ycbcr_enc);
vcap->format = f->fmt.pix;
return 0;
}
static int vimc_cap_enum_fmt_vid_cap(struct file *file, void *priv,
struct v4l2_fmtdesc *f)
{
const struct vimc_pix_map *vpix = vimc_pix_map_by_index(f->index);
if (!vpix)
return -EINVAL;
f->pixelformat = vpix->pixelformat;
return 0;
}
static int vimc_cap_enum_framesizes(struct file *file, void *fh,
struct v4l2_frmsizeenum *fsize)
{
const struct vimc_pix_map *vpix;
if (fsize->index)
return -EINVAL;
/* Only accept code in the pix map table */
vpix = vimc_pix_map_by_code(fsize->pixel_format);
if (!vpix)
return -EINVAL;
fsize->type = V4L2_FRMSIZE_TYPE_CONTINUOUS;
fsize->stepwise.min_width = VIMC_FRAME_MIN_WIDTH;
fsize->stepwise.max_width = VIMC_FRAME_MAX_WIDTH;
fsize->stepwise.min_height = VIMC_FRAME_MIN_HEIGHT;
fsize->stepwise.max_height = VIMC_FRAME_MAX_HEIGHT;
fsize->stepwise.step_width = 2;
fsize->stepwise.step_height = 2;
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_g_fmt_vid_cap,
.vidioc_s_fmt_vid_cap = vimc_cap_s_fmt_vid_cap,
.vidioc_try_fmt_vid_cap = vimc_cap_try_fmt_vid_cap,
.vidioc_enum_fmt_vid_cap = vimc_cap_enum_fmt_vid_cap,
.vidioc_enum_framesizes = vimc_cap_enum_framesizes,
.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_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->stream.pipe);
if (ret) {
vimc_cap_return_all_buffers(vcap, VB2_BUF_STATE_QUEUED);
return ret;
}
ret = vimc_streamer_s_stream(&vcap->stream, &vcap->ved, 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);
vimc_streamer_s_stream(&vcap->stream, &vcap->ved, 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->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,
};
static const struct media_entity_operations vimc_cap_mops = {
.link_validate = vimc_link_validate,
};
static void vimc_cap_comp_unbind(struct device *comp, struct device *master,
void *master_data)
{
struct vimc_ent_device *ved = dev_get_drvdata(comp);
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,
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 ERR_PTR(-EAGAIN);
}
/* 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);
return NULL;
}
static int vimc_cap_comp_bind(struct device *comp, struct device *master,
void *master_data)
{
struct v4l2_device *v4l2_dev = master_data;
struct vimc_platform_data *pdata = comp->platform_data;
const struct vimc_pix_map *vpix;
struct vimc_cap_device *vcap;
struct video_device *vdev;
struct vb2_queue *q;
int ret;
/* Allocate the vimc_cap_device struct */
vcap = kzalloc(sizeof(*vcap), GFP_KERNEL);
if (!vcap)
return -ENOMEM;
/* Allocate the pads */
vcap->ved.pads =
vimc_pads_init(1, (const unsigned long[1]) {MEDIA_PAD_FL_SINK});
if (IS_ERR(vcap->ved.pads)) {
ret = PTR_ERR(vcap->ved.pads);
goto err_free_vcap;
}
/* Initialize the media entity */
vcap->vdev.entity.name = pdata->entity_name;
vcap->vdev.entity.function = MEDIA_ENT_F_IO_V4L;
ret = media_entity_pads_init(&vcap->vdev.entity,
1, 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(comp, "%s: vb2 queue init failed (err=%d)\n",
pdata->entity_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 default frame format */
vcap->format = fmt_default;
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.ent = &vcap->vdev.entity;
vcap->ved.process_frame = vimc_cap_process_frame;
vcap->ved.vdev_get_format = vimc_cap_get_format;
dev_set_drvdata(comp, &vcap->ved);
vcap->dev = comp;
/* 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, pdata->entity_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(comp, "%s: video register failed (err=%d)\n",
vcap->vdev.name, ret);
goto err_release_queue;
}
return 0;
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 ret;
}
static const struct component_ops vimc_cap_comp_ops = {
.bind = vimc_cap_comp_bind,
.unbind = vimc_cap_comp_unbind,
};
static int vimc_cap_probe(struct platform_device *pdev)
{
return component_add(&pdev->dev, &vimc_cap_comp_ops);
}
static int vimc_cap_remove(struct platform_device *pdev)
{
component_del(&pdev->dev, &vimc_cap_comp_ops);
return 0;
}
static const struct platform_device_id vimc_cap_driver_ids[] = {
{
.name = VIMC_CAP_DRV_NAME,
},
{ }
};
static struct platform_driver vimc_cap_pdrv = {
.probe = vimc_cap_probe,
.remove = vimc_cap_remove,
.id_table = vimc_cap_driver_ids,
.driver = {
.name = VIMC_CAP_DRV_NAME,
},
};
module_platform_driver(vimc_cap_pdrv);
MODULE_DEVICE_TABLE(platform, vimc_cap_driver_ids);
MODULE_DESCRIPTION("Virtual Media Controller Driver (VIMC) Capture");
MODULE_AUTHOR("Helen Mae Koike Fornazier <helen.fornazier@gmail.com>");
MODULE_LICENSE("GPL");