// SPDX-License-Identifier: GPL-2.0+
/*
* vsp1_histo.c -- R-Car VSP1 Histogram API
*
* Copyright (C) 2016 Renesas Electronics Corporation
* Copyright (C) 2016 Laurent Pinchart
*
* Contact: Laurent Pinchart ([email protected])
*/
#include <linux/device.h>
#include <linux/gfp.h>
#include <media/v4l2-ioctl.h>
#include <media/v4l2-subdev.h>
#include <media/videobuf2-vmalloc.h>
#include "vsp1.h"
#include "vsp1_histo.h"
#include "vsp1_pipe.h"
#define HISTO_MIN_SIZE 4U
#define HISTO_MAX_SIZE 8192U
/* -----------------------------------------------------------------------------
* Buffer Operations
*/
static inline struct vsp1_histogram_buffer *
to_vsp1_histogram_buffer(struct vb2_v4l2_buffer *vbuf)
{
return container_of(vbuf, struct vsp1_histogram_buffer, buf);
}
struct vsp1_histogram_buffer *
vsp1_histogram_buffer_get(struct vsp1_histogram *histo)
{
struct vsp1_histogram_buffer *buf = NULL;
spin_lock(&histo->irqlock);
if (list_empty(&histo->irqqueue))
goto done;
buf = list_first_entry(&histo->irqqueue, struct vsp1_histogram_buffer,
queue);
list_del(&buf->queue);
histo->readout = true;
done:
spin_unlock(&histo->irqlock);
return buf;
}
void vsp1_histogram_buffer_complete(struct vsp1_histogram *histo,
struct vsp1_histogram_buffer *buf,
size_t size)
{
struct vsp1_pipeline *pipe = histo->entity.pipe;
/*
* The pipeline pointer is guaranteed to be valid as this function is
* called from the frame completion interrupt handler, which can only
* occur when video streaming is active.
*/
buf->buf.sequence = pipe->sequence;
buf->buf.vb2_buf.timestamp = ktime_get_ns();
vb2_set_plane_payload(&buf->buf.vb2_buf, 0, size);
vb2_buffer_done(&buf->buf.vb2_buf, VB2_BUF_STATE_DONE);
spin_lock(&histo->irqlock);
histo->readout = false;
wake_up(&histo->wait_queue);
spin_unlock(&histo->irqlock);
}
/* -----------------------------------------------------------------------------
* videobuf2 Queue Operations
*/
static int histo_queue_setup(struct vb2_queue *vq, unsigned int *nbuffers,
unsigned int *nplanes, unsigned int sizes[],
struct device *alloc_devs[])
{
struct vsp1_histogram *histo = vb2_get_drv_priv(vq);
if (*nplanes) {
if (*nplanes != 1)
return -EINVAL;
if (sizes[0] < histo->data_size)
return -EINVAL;
return 0;
}
*nplanes = 1;
sizes[0] = histo->data_size;
return 0;
}
static int histo_buffer_prepare(struct vb2_buffer *vb)
{
struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
struct vsp1_histogram *histo = vb2_get_drv_priv(vb->vb2_queue);
struct vsp1_histogram_buffer *buf = to_vsp1_histogram_buffer(vbuf);
if (vb->num_planes != 1)
return -EINVAL;
if (vb2_plane_size(vb, 0) < histo->data_size)
return -EINVAL;
buf->addr = vb2_plane_vaddr(vb, 0);
return 0;
}
static void histo_buffer_queue(struct vb2_buffer *vb)
{
struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
struct vsp1_histogram *histo = vb2_get_drv_priv(vb->vb2_queue);
struct vsp1_histogram_buffer *buf = to_vsp1_histogram_buffer(vbuf);
spin_lock_irq(&histo->irqlock);
list_add_tail(&buf->queue, &histo->irqqueue);
spin_unlock_irq(&histo->irqlock);
}
static int histo_start_streaming(struct vb2_queue *vq, unsigned int count)
{
return 0;
}
static void histo_stop_streaming(struct vb2_queue *vq)
{
struct vsp1_histogram *histo = vb2_get_drv_priv(vq);
struct vsp1_histogram_buffer *buffer;
spin_lock_irq(&histo->irqlock);
/* Remove all buffers from the IRQ queue. */
list_for_each_entry(buffer, &histo->irqqueue, queue)
vb2_buffer_done(&buffer->buf.vb2_buf, VB2_BUF_STATE_ERROR);
INIT_LIST_HEAD(&histo->irqqueue);
/* Wait for the buffer being read out (if any) to complete. */
wait_event_lock_irq(histo->wait_queue, !histo->readout, histo->irqlock);
spin_unlock_irq(&histo->irqlock);
}
static const struct vb2_ops histo_video_queue_qops = {
.queue_setup = histo_queue_setup,
.buf_prepare = histo_buffer_prepare,
.buf_queue = histo_buffer_queue,
.wait_prepare = vb2_ops_wait_prepare,
.wait_finish = vb2_ops_wait_finish,
.start_streaming = histo_start_streaming,
.stop_streaming = histo_stop_streaming,
};
/* -----------------------------------------------------------------------------
* V4L2 Subdevice Operations
*/
static int histo_enum_mbus_code(struct v4l2_subdev *subdev,
struct v4l2_subdev_state *sd_state,
struct v4l2_subdev_mbus_code_enum *code)
{
struct vsp1_histogram *histo = subdev_to_histo(subdev);
if (code->pad == HISTO_PAD_SOURCE) {
code->code = MEDIA_BUS_FMT_FIXED;
return 0;
}
return vsp1_subdev_enum_mbus_code(subdev, sd_state, code,
histo->formats,
histo->num_formats);
}
static int histo_enum_frame_size(struct v4l2_subdev *subdev,
struct v4l2_subdev_state *sd_state,
struct v4l2_subdev_frame_size_enum *fse)
{
if (fse->pad != HISTO_PAD_SINK)
return -EINVAL;
return vsp1_subdev_enum_frame_size(subdev, sd_state, fse,
HISTO_MIN_SIZE,
HISTO_MIN_SIZE, HISTO_MAX_SIZE,
HISTO_MAX_SIZE);
}
static int histo_get_selection(struct v4l2_subdev *subdev,
struct v4l2_subdev_state *sd_state,
struct v4l2_subdev_selection *sel)
{
struct vsp1_histogram *histo = subdev_to_histo(subdev);
struct v4l2_subdev_state *state;
struct v4l2_mbus_framefmt *format;
struct v4l2_rect *crop;
int ret = 0;
if (sel->pad != HISTO_PAD_SINK)
return -EINVAL;
mutex_lock(&histo->entity.lock);
state = vsp1_entity_get_state(&histo->entity, sd_state, sel->which);
if (!state) {
ret = -EINVAL;
goto done;
}
switch (sel->target) {
case V4L2_SEL_TGT_COMPOSE_BOUNDS:
case V4L2_SEL_TGT_COMPOSE_DEFAULT:
crop = v4l2_subdev_state_get_crop(state, HISTO_PAD_SINK);
sel->r.left = 0;
sel->r.top = 0;
sel->r.width = crop->width;
sel->r.height = crop->height;
break;
case V4L2_SEL_TGT_CROP_BOUNDS:
case V4L2_SEL_TGT_CROP_DEFAULT:
format = v4l2_subdev_state_get_format(state, HISTO_PAD_SINK);
sel->r.left = 0;
sel->r.top = 0;
sel->r.width = format->width;
sel->r.height = format->height;
break;
case V4L2_SEL_TGT_COMPOSE:
sel->r = *v4l2_subdev_state_get_compose(state, sel->pad);
break;
case V4L2_SEL_TGT_CROP:
sel->r = *v4l2_subdev_state_get_crop(state, sel->pad);
break;
default:
ret = -EINVAL;
break;
}
done:
mutex_unlock(&histo->entity.lock);
return ret;
}
static int histo_set_crop(struct v4l2_subdev *subdev,
struct v4l2_subdev_state *sd_state,
struct v4l2_subdev_selection *sel)
{
struct v4l2_mbus_framefmt *format;
/* The crop rectangle must be inside the input frame. */
format = v4l2_subdev_state_get_format(sd_state, HISTO_PAD_SINK);
sel->r.left = clamp_t(unsigned int, sel->r.left, 0, format->width - 1);
sel->r.top = clamp_t(unsigned int, sel->r.top, 0, format->height - 1);
sel->r.width = clamp_t(unsigned int, sel->r.width, HISTO_MIN_SIZE,
format->width - sel->r.left);
sel->r.height = clamp_t(unsigned int, sel->r.height, HISTO_MIN_SIZE,
format->height - sel->r.top);
/* Set the crop rectangle and reset the compose rectangle. */
*v4l2_subdev_state_get_crop(sd_state, sel->pad) = sel->r;
*v4l2_subdev_state_get_compose(sd_state, sel->pad) = sel->r;
return 0;
}
static int histo_set_compose(struct v4l2_subdev *subdev,
struct v4l2_subdev_state *sd_state,
struct v4l2_subdev_selection *sel)
{
struct v4l2_rect *compose;
struct v4l2_rect *crop;
unsigned int ratio;
/*
* The compose rectangle is used to configure downscaling, the top left
* corner is fixed to (0,0) and the size to 1/2 or 1/4 of the crop
* rectangle.
*/
sel->r.left = 0;
sel->r.top = 0;
crop = v4l2_subdev_state_get_crop(sd_state, sel->pad);
/*
* Clamp the width and height to acceptable values first and then
* compute the closest rounded dividing ratio.
*
* Ratio Rounded ratio
* --------------------------
* [1.0 1.5[ 1
* [1.5 3.0[ 2
* [3.0 4.0] 4
*
* The rounded ratio can be computed using
*
* 1 << (ceil(ratio * 2) / 3)
*/
sel->r.width = clamp(sel->r.width, crop->width / 4, crop->width);
ratio = 1 << (crop->width * 2 / sel->r.width / 3);
sel->r.width = crop->width / ratio;
sel->r.height = clamp(sel->r.height, crop->height / 4, crop->height);
ratio = 1 << (crop->height * 2 / sel->r.height / 3);
sel->r.height = crop->height / ratio;
compose = v4l2_subdev_state_get_compose(sd_state, sel->pad);
*compose = sel->r;
return 0;
}
static int histo_set_selection(struct v4l2_subdev *subdev,
struct v4l2_subdev_state *sd_state,
struct v4l2_subdev_selection *sel)
{
struct vsp1_histogram *histo = subdev_to_histo(subdev);
struct v4l2_subdev_state *state;
int ret;
if (sel->pad != HISTO_PAD_SINK)
return -EINVAL;
mutex_lock(&histo->entity.lock);
state = vsp1_entity_get_state(&histo->entity, sd_state, sel->which);
if (!state) {
ret = -EINVAL;
goto done;
}
if (sel->target == V4L2_SEL_TGT_CROP)
ret = histo_set_crop(subdev, state, sel);
else if (sel->target == V4L2_SEL_TGT_COMPOSE)
ret = histo_set_compose(subdev, state, sel);
else
ret = -EINVAL;
done:
mutex_unlock(&histo->entity.lock);
return ret;
}
static int histo_set_format(struct v4l2_subdev *subdev,
struct v4l2_subdev_state *sd_state,
struct v4l2_subdev_format *fmt)
{
struct vsp1_histogram *histo = subdev_to_histo(subdev);
if (fmt->pad == HISTO_PAD_SOURCE) {
fmt->format.code = MEDIA_BUS_FMT_FIXED;
fmt->format.width = 0;
fmt->format.height = 0;
fmt->format.field = V4L2_FIELD_NONE;
fmt->format.colorspace = V4L2_COLORSPACE_RAW;
return 0;
}
return vsp1_subdev_set_pad_format(subdev, sd_state, fmt,
histo->formats, histo->num_formats,
HISTO_MIN_SIZE, HISTO_MIN_SIZE,
HISTO_MAX_SIZE, HISTO_MAX_SIZE);
}
static const struct v4l2_subdev_pad_ops histo_pad_ops = {
.enum_mbus_code = histo_enum_mbus_code,
.enum_frame_size = histo_enum_frame_size,
.get_fmt = vsp1_subdev_get_pad_format,
.set_fmt = histo_set_format,
.get_selection = histo_get_selection,
.set_selection = histo_set_selection,
};
static const struct v4l2_subdev_ops histo_ops = {
.pad = &histo_pad_ops,
};
/* -----------------------------------------------------------------------------
* V4L2 ioctls
*/
static int histo_v4l2_querycap(struct file *file, void *fh,
struct v4l2_capability *cap)
{
struct v4l2_fh *vfh = file->private_data;
struct vsp1_histogram *histo = vdev_to_histo(vfh->vdev);
cap->capabilities = V4L2_CAP_DEVICE_CAPS | V4L2_CAP_STREAMING
| V4L2_CAP_VIDEO_CAPTURE_MPLANE
| V4L2_CAP_VIDEO_OUTPUT_MPLANE
| V4L2_CAP_META_CAPTURE;
strscpy(cap->driver, "vsp1", sizeof(cap->driver));
strscpy(cap->card, histo->video.name, sizeof(cap->card));
return 0;
}
static int histo_v4l2_enum_format(struct file *file, void *fh,
struct v4l2_fmtdesc *f)
{
struct v4l2_fh *vfh = file->private_data;
struct vsp1_histogram *histo = vdev_to_histo(vfh->vdev);
if (f->index > 0 || f->type != histo->queue.type)
return -EINVAL;
f->pixelformat = histo->meta_format;
return 0;
}
static int histo_v4l2_get_format(struct file *file, void *fh,
struct v4l2_format *format)
{
struct v4l2_fh *vfh = file->private_data;
struct vsp1_histogram *histo = vdev_to_histo(vfh->vdev);
struct v4l2_meta_format *meta = &format->fmt.meta;
if (format->type != histo->queue.type)
return -EINVAL;
memset(meta, 0, sizeof(*meta));
meta->dataformat = histo->meta_format;
meta->buffersize = histo->data_size;
return 0;
}
static const struct v4l2_ioctl_ops histo_v4l2_ioctl_ops = {
.vidioc_querycap = histo_v4l2_querycap,
.vidioc_enum_fmt_meta_cap = histo_v4l2_enum_format,
.vidioc_g_fmt_meta_cap = histo_v4l2_get_format,
.vidioc_s_fmt_meta_cap = histo_v4l2_get_format,
.vidioc_try_fmt_meta_cap = histo_v4l2_get_format,
.vidioc_reqbufs = vb2_ioctl_reqbufs,
.vidioc_querybuf = vb2_ioctl_querybuf,
.vidioc_qbuf = vb2_ioctl_qbuf,
.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 histo_v4l2_fops = {
.owner = THIS_MODULE,
.unlocked_ioctl = video_ioctl2,
.open = v4l2_fh_open,
.release = vb2_fop_release,
.poll = vb2_fop_poll,
.mmap = vb2_fop_mmap,
};
static void vsp1_histogram_cleanup(struct vsp1_histogram *histo)
{
if (video_is_registered(&histo->video))
video_unregister_device(&histo->video);
media_entity_cleanup(&histo->video.entity);
}
void vsp1_histogram_destroy(struct vsp1_entity *entity)
{
struct vsp1_histogram *histo = subdev_to_histo(&entity->subdev);
vsp1_histogram_cleanup(histo);
}
int vsp1_histogram_init(struct vsp1_device *vsp1, struct vsp1_histogram *histo,
enum vsp1_entity_type type, const char *name,
const struct vsp1_entity_operations *ops,
const unsigned int *formats, unsigned int num_formats,
size_t data_size, u32 meta_format)
{
int ret;
histo->formats = formats;
histo->num_formats = num_formats;
histo->data_size = data_size;
histo->meta_format = meta_format;
histo->pad.flags = MEDIA_PAD_FL_SINK;
histo->video.vfl_dir = VFL_DIR_RX;
mutex_init(&histo->lock);
spin_lock_init(&histo->irqlock);
INIT_LIST_HEAD(&histo->irqqueue);
init_waitqueue_head(&histo->wait_queue);
/* Initialize the VSP entity... */
histo->entity.ops = ops;
histo->entity.type = type;
ret = vsp1_entity_init(vsp1, &histo->entity, name, 2, &histo_ops,
MEDIA_ENT_F_PROC_VIDEO_STATISTICS);
if (ret < 0)
return ret;
/* ... and the media entity... */
ret = media_entity_pads_init(&histo->video.entity, 1, &histo->pad);
if (ret < 0)
return ret;
/* ... and the video node... */
histo->video.v4l2_dev = &vsp1->v4l2_dev;
histo->video.fops = &histo_v4l2_fops;
snprintf(histo->video.name, sizeof(histo->video.name),
"%s histo", histo->entity.subdev.name);
histo->video.vfl_type = VFL_TYPE_VIDEO;
histo->video.release = video_device_release_empty;
histo->video.ioctl_ops = &histo_v4l2_ioctl_ops;
histo->video.device_caps = V4L2_CAP_META_CAPTURE | V4L2_CAP_STREAMING;
video_set_drvdata(&histo->video, histo);
/* ... and the buffers queue... */
histo->queue.type = V4L2_BUF_TYPE_META_CAPTURE;
histo->queue.io_modes = VB2_MMAP | VB2_USERPTR | VB2_DMABUF;
histo->queue.lock = &histo->lock;
histo->queue.drv_priv = histo;
histo->queue.buf_struct_size = sizeof(struct vsp1_histogram_buffer);
histo->queue.ops = &histo_video_queue_qops;
histo->queue.mem_ops = &vb2_vmalloc_memops;
histo->queue.timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_COPY;
histo->queue.dev = vsp1->dev;
ret = vb2_queue_init(&histo->queue);
if (ret < 0) {
dev_err(vsp1->dev, "failed to initialize vb2 queue\n");
goto error;
}
/* ... and register the video device. */
histo->video.queue = &histo->queue;
ret = video_register_device(&histo->video, VFL_TYPE_VIDEO, -1);
if (ret < 0) {
dev_err(vsp1->dev, "failed to register video device\n");
goto error;
}
return 0;
error:
vsp1_histogram_cleanup(histo);
return ret;
}
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