// SPDX-License-Identifier: GPL-2.0
/*
* stf_video.c
*
* StarFive Camera Subsystem - V4L2 device node
*
* Copyright (C) 2021-2023 StarFive Technology Co., Ltd.
*/
#include <linux/pm_runtime.h>
#include <media/v4l2-ctrls.h>
#include <media/v4l2-event.h>
#include <media/v4l2-mc.h>
#include <media/videobuf2-dma-contig.h>
#include "stf-camss.h"
#include "stf-video.h"
/* -----------------------------------------------------------------------------
* Helper functions
*/
static inline struct stfcamss_buffer *
to_stfcamss_buffer(struct vb2_v4l2_buffer *vbuf)
{
return container_of(vbuf, struct stfcamss_buffer, vb);
}
static const struct stfcamss_format_info *
video_g_fi_by_index(struct stfcamss_video *video, int index)
{
if (index >= video->nformats)
return NULL;
return &video->formats[index];
}
static const struct stfcamss_format_info *
video_g_fi_by_mcode(struct stfcamss_video *video, u32 mcode)
{
unsigned int i;
for (i = 0; i < video->nformats; i++) {
if (video->formats[i].code == mcode)
return &video->formats[i];
}
return NULL;
}
static const struct stfcamss_format_info *
video_g_fi_by_pfmt(struct stfcamss_video *video, u32 pixelformat)
{
unsigned int i;
for (i = 0; i < video->nformats; i++) {
if (video->formats[i].pixelformat == pixelformat)
return &video->formats[i];
}
return NULL;
}
static int __video_try_fmt(struct stfcamss_video *video, struct v4l2_format *f)
{
struct v4l2_pix_format *pix = &f->fmt.pix;
const struct stfcamss_format_info *fi;
u32 width, height;
u32 bpl;
unsigned int i;
fi = video_g_fi_by_pfmt(video, pix->pixelformat);
if (!fi)
fi = &video->formats[0]; /* default format */
width = pix->width;
height = pix->height;
memset(pix, 0, sizeof(*pix));
pix->pixelformat = fi->pixelformat;
pix->width = clamp_t(u32, width, STFCAMSS_FRAME_MIN_WIDTH,
STFCAMSS_FRAME_MAX_WIDTH);
pix->height = clamp_t(u32, height, STFCAMSS_FRAME_MIN_HEIGHT,
STFCAMSS_FRAME_MAX_HEIGHT);
bpl = pix->width * fi->bpp / 8;
bpl = ALIGN(bpl, video->bpl_alignment);
pix->bytesperline = bpl;
for (i = 0; i < fi->planes; ++i)
pix->sizeimage += bpl * pix->height / fi->vsub[i];
pix->field = V4L2_FIELD_NONE;
pix->colorspace = V4L2_COLORSPACE_SRGB;
pix->flags = 0;
pix->ycbcr_enc =
V4L2_MAP_YCBCR_ENC_DEFAULT(pix->colorspace);
pix->quantization = V4L2_MAP_QUANTIZATION_DEFAULT(true,
pix->colorspace,
pix->ycbcr_enc);
pix->xfer_func = V4L2_MAP_XFER_FUNC_DEFAULT(pix->colorspace);
return 0;
}
static int stf_video_init_format(struct stfcamss_video *video)
{
int ret;
struct v4l2_format format = {
.type = video->type,
.fmt.pix = {
.width = 1920,
.height = 1080,
.pixelformat = V4L2_PIX_FMT_NV12,
},
};
ret = __video_try_fmt(video, &format);
if (ret < 0)
return ret;
video->active_fmt = format;
return 0;
}
/* -----------------------------------------------------------------------------
* Video queue operations
*/
static int video_queue_setup(struct vb2_queue *q,
unsigned int *num_buffers,
unsigned int *num_planes,
unsigned int sizes[],
struct device *alloc_devs[])
{
struct stfcamss_video *video = vb2_get_drv_priv(q);
const struct v4l2_pix_format *format = &video->active_fmt.fmt.pix;
if (*num_planes) {
if (*num_planes != 1)
return -EINVAL;
if (sizes[0] < format->sizeimage)
return -EINVAL;
} else {
*num_planes = 1;
sizes[0] = format->sizeimage;
}
if (!sizes[0]) {
dev_dbg(video->stfcamss->dev,
"%s: error size is zero.\n", __func__);
return -EINVAL;
}
dev_dbg(video->stfcamss->dev, "planes = %d, size = %d\n",
*num_planes, sizes[0]);
return 0;
}
static int video_buf_init(struct vb2_buffer *vb)
{
struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
struct stfcamss_video *video = vb2_get_drv_priv(vb->vb2_queue);
struct stfcamss_buffer *buffer = to_stfcamss_buffer(vbuf);
const struct v4l2_pix_format *fmt = &video->active_fmt.fmt.pix;
dma_addr_t *paddr;
paddr = vb2_plane_cookie(vb, 0);
buffer->addr[0] = *paddr;
if (fmt->pixelformat == V4L2_PIX_FMT_NV12)
buffer->addr[1] =
buffer->addr[0] + fmt->bytesperline * fmt->height;
return 0;
}
static int video_buf_prepare(struct vb2_buffer *vb)
{
struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
struct stfcamss_video *video = vb2_get_drv_priv(vb->vb2_queue);
const struct v4l2_pix_format *fmt = &video->active_fmt.fmt.pix;
if (fmt->sizeimage > vb2_plane_size(vb, 0)) {
dev_dbg(video->stfcamss->dev,
"sizeimage = %u, plane size = %u\n",
fmt->sizeimage, (unsigned int)vb2_plane_size(vb, 0));
return -EINVAL;
}
vb2_set_plane_payload(vb, 0, fmt->sizeimage);
vbuf->field = V4L2_FIELD_NONE;
return 0;
}
static void video_buf_queue(struct vb2_buffer *vb)
{
struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
struct stfcamss_video *video = vb2_get_drv_priv(vb->vb2_queue);
struct stfcamss_buffer *buffer = to_stfcamss_buffer(vbuf);
video->ops->queue_buffer(video, buffer);
}
static int video_get_subdev_format(struct stfcamss_video *video,
struct v4l2_subdev_format *fmt)
{
struct v4l2_subdev *subdev;
struct media_pad *pad;
struct media_entity *entity;
int ret;
entity = &video->vdev.entity;
while (1) {
pad = &entity->pads[0];
if (!(pad->flags & MEDIA_PAD_FL_SINK))
break;
pad = media_pad_remote_pad_first(pad);
if (!pad || !is_media_entity_v4l2_subdev(pad->entity))
break;
entity = pad->entity;
subdev = media_entity_to_v4l2_subdev(entity);
fmt->pad = pad->index;
ret = v4l2_subdev_call_state_active(subdev, pad, get_fmt, fmt);
if (ret < 0 && ret != -ENOIOCTLCMD)
return ret;
else if (!ret)
break;
}
return 0;
}
static int stf_video_check_format(struct stfcamss_video *video)
{
struct v4l2_pix_format *pix = &video->active_fmt.fmt.pix;
const struct stfcamss_format_info *fi;
int ret;
struct v4l2_subdev_format sd_fmt = {
.which = V4L2_SUBDEV_FORMAT_ACTIVE,
};
ret = video_get_subdev_format(video, &sd_fmt);
if (ret < 0)
return ret;
fi = video_g_fi_by_mcode(video, sd_fmt.format.code);
if (!fi)
return -EINVAL;
if (pix->pixelformat != fi->pixelformat ||
pix->height != sd_fmt.format.height ||
pix->width != sd_fmt.format.width ||
pix->field != sd_fmt.format.field)
return -EPIPE;
return 0;
}
static int video_start_streaming(struct vb2_queue *q, unsigned int count)
{
struct stfcamss_video *video = vb2_get_drv_priv(q);
struct video_device *vdev = &video->vdev;
int ret;
ret = video_device_pipeline_start(vdev, &video->stfcamss->pipe);
if (ret < 0) {
dev_err(video->stfcamss->dev,
"Failed to media_pipeline_start: %d\n", ret);
goto err_ret_buffers;
}
ret = pm_runtime_resume_and_get(video->stfcamss->dev);
if (ret < 0) {
dev_err(video->stfcamss->dev, "power up failed %d\n", ret);
goto err_pipeline_stop;
}
video->ops->start_streaming(video);
ret = v4l2_subdev_call(video->source_subdev, video, s_stream, true);
if (ret) {
dev_err(video->stfcamss->dev, "stream on failed\n");
goto err_pm_put;
}
return 0;
err_pm_put:
pm_runtime_put(video->stfcamss->dev);
err_pipeline_stop:
video_device_pipeline_stop(vdev);
err_ret_buffers:
video->ops->flush_buffers(video, VB2_BUF_STATE_QUEUED);
return ret;
}
static void video_stop_streaming(struct vb2_queue *q)
{
struct stfcamss_video *video = vb2_get_drv_priv(q);
struct video_device *vdev = &video->vdev;
video->ops->stop_streaming(video);
v4l2_subdev_call(video->source_subdev, video, s_stream, false);
pm_runtime_put(video->stfcamss->dev);
video_device_pipeline_stop(vdev);
video->ops->flush_buffers(video, VB2_BUF_STATE_ERROR);
}
static const struct vb2_ops stf_video_vb2_q_ops = {
.queue_setup = video_queue_setup,
.wait_prepare = vb2_ops_wait_prepare,
.wait_finish = vb2_ops_wait_finish,
.buf_init = video_buf_init,
.buf_prepare = video_buf_prepare,
.buf_queue = video_buf_queue,
.start_streaming = video_start_streaming,
.stop_streaming = video_stop_streaming,
};
/* -----------------------------------------------------------------------------
* V4L2 ioctls
*/
static int video_querycap(struct file *file, void *fh,
struct v4l2_capability *cap)
{
strscpy(cap->driver, "starfive-camss", sizeof(cap->driver));
strscpy(cap->card, "Starfive Camera Subsystem", sizeof(cap->card));
return 0;
}
static int video_enum_fmt(struct file *file, void *fh, struct v4l2_fmtdesc *f)
{
struct stfcamss_video *video = video_drvdata(file);
const struct stfcamss_format_info *fi;
if (f->index >= video->nformats)
return -EINVAL;
if (f->mbus_code) {
/* Each entry in formats[] table has unique mbus_code */
if (f->index > 0)
return -EINVAL;
fi = video_g_fi_by_mcode(video, f->mbus_code);
} else {
fi = video_g_fi_by_index(video, f->index);
}
if (!fi)
return -EINVAL;
f->pixelformat = fi->pixelformat;
return 0;
}
static int video_enum_framesizes(struct file *file, void *fh,
struct v4l2_frmsizeenum *fsize)
{
struct stfcamss_video *video = video_drvdata(file);
unsigned int i;
if (fsize->index)
return -EINVAL;
for (i = 0; i < video->nformats; i++) {
if (video->formats[i].pixelformat == fsize->pixel_format)
break;
}
if (i == video->nformats)
return -EINVAL;
fsize->type = V4L2_FRMSIZE_TYPE_CONTINUOUS;
fsize->stepwise.min_width = STFCAMSS_FRAME_MIN_WIDTH;
fsize->stepwise.max_width = STFCAMSS_FRAME_MAX_WIDTH;
fsize->stepwise.min_height = STFCAMSS_FRAME_MIN_HEIGHT;
fsize->stepwise.max_height = STFCAMSS_FRAME_MAX_HEIGHT;
fsize->stepwise.step_width = 1;
fsize->stepwise.step_height = 1;
return 0;
}
static int video_g_fmt(struct file *file, void *fh, struct v4l2_format *f)
{
struct stfcamss_video *video = video_drvdata(file);
*f = video->active_fmt;
return 0;
}
static int video_s_fmt(struct file *file, void *fh, struct v4l2_format *f)
{
struct stfcamss_video *video = video_drvdata(file);
int ret;
if (vb2_is_busy(&video->vb2_q))
return -EBUSY;
ret = __video_try_fmt(video, f);
if (ret < 0)
return ret;
video->active_fmt = *f;
return 0;
}
static int video_try_fmt(struct file *file, void *fh, struct v4l2_format *f)
{
struct stfcamss_video *video = video_drvdata(file);
return __video_try_fmt(video, f);
}
static const struct v4l2_ioctl_ops stf_vid_ioctl_ops = {
.vidioc_querycap = video_querycap,
.vidioc_enum_fmt_vid_cap = video_enum_fmt,
.vidioc_enum_framesizes = video_enum_framesizes,
.vidioc_g_fmt_vid_cap = video_g_fmt,
.vidioc_s_fmt_vid_cap = video_s_fmt,
.vidioc_try_fmt_vid_cap = video_try_fmt,
.vidioc_reqbufs = vb2_ioctl_reqbufs,
.vidioc_querybuf = vb2_ioctl_querybuf,
.vidioc_qbuf = vb2_ioctl_qbuf,
.vidioc_expbuf = vb2_ioctl_expbuf,
.vidioc_dqbuf = vb2_ioctl_dqbuf,
.vidioc_create_bufs = vb2_ioctl_create_bufs,
.vidioc_prepare_buf = vb2_ioctl_prepare_buf,
.vidioc_streamon = vb2_ioctl_streamon,
.vidioc_streamoff = vb2_ioctl_streamoff,
};
/* -----------------------------------------------------------------------------
* V4L2 file operations
*/
static const struct v4l2_file_operations stf_vid_fops = {
.owner = THIS_MODULE,
.unlocked_ioctl = video_ioctl2,
.open = v4l2_fh_open,
.release = vb2_fop_release,
.poll = vb2_fop_poll,
.mmap = vb2_fop_mmap,
.read = vb2_fop_read,
};
/* -----------------------------------------------------------------------------
* STFCAMSS video core
*/
static int stf_link_validate(struct media_link *link)
{
struct video_device *vdev =
media_entity_to_video_device(link->sink->entity);
struct stfcamss_video *video = video_get_drvdata(vdev);
int ret;
ret = stf_video_check_format(video);
return ret;
}
static const struct media_entity_operations stf_media_ops = {
.link_validate = stf_link_validate,
};
static void stf_video_release(struct video_device *vdev)
{
struct stfcamss_video *video = video_get_drvdata(vdev);
media_entity_cleanup(&vdev->entity);
mutex_destroy(&video->q_lock);
mutex_destroy(&video->lock);
}
int stf_video_register(struct stfcamss_video *video,
struct v4l2_device *v4l2_dev, const char *name)
{
struct video_device *vdev = &video->vdev;
struct vb2_queue *q;
struct media_pad *pad = &video->pad;
int ret;
mutex_init(&video->q_lock);
mutex_init(&video->lock);
q = &video->vb2_q;
q->drv_priv = video;
q->mem_ops = &vb2_dma_contig_memops;
q->ops = &stf_video_vb2_q_ops;
q->type = video->type;
q->io_modes = VB2_DMABUF | VB2_MMAP;
q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
q->buf_struct_size = sizeof(struct stfcamss_buffer);
q->dev = video->stfcamss->dev;
q->lock = &video->q_lock;
q->min_queued_buffers = STFCAMSS_MIN_BUFFERS;
ret = vb2_queue_init(q);
if (ret < 0) {
dev_err(video->stfcamss->dev,
"Failed to init vb2 queue: %d\n", ret);
goto err_mutex_destroy;
}
pad->flags = MEDIA_PAD_FL_SINK;
ret = media_entity_pads_init(&vdev->entity, 1, pad);
if (ret < 0) {
dev_err(video->stfcamss->dev,
"Failed to init video entity: %d\n", ret);
goto err_mutex_destroy;
}
ret = stf_video_init_format(video);
if (ret < 0) {
dev_err(video->stfcamss->dev,
"Failed to init format: %d\n", ret);
goto err_media_cleanup;
}
vdev->fops = &stf_vid_fops;
vdev->ioctl_ops = &stf_vid_ioctl_ops;
vdev->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
vdev->entity.ops = &stf_media_ops;
vdev->vfl_dir = VFL_DIR_RX;
vdev->release = stf_video_release;
vdev->v4l2_dev = v4l2_dev;
vdev->queue = &video->vb2_q;
vdev->lock = &video->lock;
strscpy(vdev->name, name, sizeof(vdev->name));
video_set_drvdata(vdev, video);
ret = video_register_device(vdev, VFL_TYPE_VIDEO, -1);
if (ret < 0) {
dev_err(video->stfcamss->dev,
"Failed to register video device: %d\n", ret);
goto err_media_cleanup;
}
return 0;
err_media_cleanup:
media_entity_cleanup(&vdev->entity);
err_mutex_destroy:
mutex_destroy(&video->lock);
mutex_destroy(&video->q_lock);
return ret;
}
void stf_video_unregister(struct stfcamss_video *video)
{
vb2_video_unregister_device(&video->vdev);
}
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