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// SPDX-License-Identifier: GPL-2.0-only
/*
 * vivid-meta-cap.c - meta capture support functions.
 */

#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/videodev2.h>
#include <media/v4l2-common.h>
#include <linux/usb/video.h>

#include "vivid-core.h"
#include "vivid-kthread-cap.h"
#include "vivid-meta-cap.h"

static int meta_cap_queue_setup(struct vb2_queue *vq, unsigned int *nbuffers,
				unsigned int *nplanes, unsigned int sizes[],
				struct device *alloc_devs[])
{
	struct vivid_dev *dev = vb2_get_drv_priv(vq);
	unsigned int size =  sizeof(struct vivid_uvc_meta_buf);

	if (!vivid_is_webcam(dev))
		return -EINVAL;

	if (*nplanes) {
		if (sizes[0] < size)
			return -EINVAL;
	} else {
		sizes[0] = size;
	}

	if (vq->num_buffers + *nbuffers < 2)
		*nbuffers = 2 - vq->num_buffers;

	*nplanes = 1;
	return 0;
}

static int meta_cap_buf_prepare(struct vb2_buffer *vb)
{
	struct vivid_dev *dev = vb2_get_drv_priv(vb->vb2_queue);
	unsigned int size = sizeof(struct vivid_uvc_meta_buf);

	dprintk(dev, 1, "%s\n", __func__);

	if (dev->buf_prepare_error) {
		/*
		 * Error injection: test what happens if buf_prepare() returns
		 * an error.
		 */
		dev->buf_prepare_error = false;
		return -EINVAL;
	}
	if (vb2_plane_size(vb, 0) < size) {
		dprintk(dev, 1, "%s data will not fit into plane (%lu < %u)\n",
			__func__, vb2_plane_size(vb, 0), size);
		return -EINVAL;
	}
	vb2_set_plane_payload(vb, 0, size);

	return 0;
}

static void meta_cap_buf_queue(struct vb2_buffer *vb)
{
	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
	struct vivid_dev *dev = vb2_get_drv_priv(vb->vb2_queue);
	struct vivid_buffer *buf = container_of(vbuf, struct vivid_buffer, vb);

	dprintk(dev, 1, "%s\n", __func__);

	spin_lock(&dev->slock);
	list_add_tail(&buf->list, &dev->meta_cap_active);
	spin_unlock(&dev->slock);
}

static int meta_cap_start_streaming(struct vb2_queue *vq, unsigned int count)
{
	struct vivid_dev *dev = vb2_get_drv_priv(vq);
	int err;

	dprintk(dev, 1, "%s\n", __func__);
	dev->meta_cap_seq_count = 0;
	if (dev->start_streaming_error) {
		dev->start_streaming_error = false;
		err = -EINVAL;
	} else {
		err = vivid_start_generating_vid_cap(dev,
						     &dev->meta_cap_streaming);
	}
	if (err) {
		struct vivid_buffer *buf, *tmp;

		list_for_each_entry_safe(buf, tmp,
					 &dev->meta_cap_active, list) {
			list_del(&buf->list);
			vb2_buffer_done(&buf->vb.vb2_buf,
					VB2_BUF_STATE_QUEUED);
		}
	}
	return err;
}

/* abort streaming and wait for last buffer */
static void meta_cap_stop_streaming(struct vb2_queue *vq)
{
	struct vivid_dev *dev = vb2_get_drv_priv(vq);

	dprintk(dev, 1, "%s\n", __func__);
	vivid_stop_generating_vid_cap(dev, &dev->meta_cap_streaming);
}

static void meta_cap_buf_request_complete(struct vb2_buffer *vb)
{
	struct vivid_dev *dev = vb2_get_drv_priv(vb->vb2_queue);

	v4l2_ctrl_request_complete(vb->req_obj.req, &dev->ctrl_hdl_meta_cap);
}

const struct vb2_ops vivid_meta_cap_qops = {
	.queue_setup		= meta_cap_queue_setup,
	.buf_prepare		= meta_cap_buf_prepare,
	.buf_queue		= meta_cap_buf_queue,
	.start_streaming	= meta_cap_start_streaming,
	.stop_streaming		= meta_cap_stop_streaming,
	.buf_request_complete	= meta_cap_buf_request_complete,
	.wait_prepare		= vb2_ops_wait_prepare,
	.wait_finish		= vb2_ops_wait_finish,
};

int vidioc_enum_fmt_meta_cap(struct file *file, void  *priv,
			     struct v4l2_fmtdesc *f)
{
	struct vivid_dev *dev = video_drvdata(file);

	if (!vivid_is_webcam(dev))
		return -EINVAL;

	if (f->index > 0)
		return -EINVAL;

	f->type = V4L2_BUF_TYPE_META_CAPTURE;
	f->pixelformat = V4L2_META_FMT_UVC;
	return 0;
}

int vidioc_g_fmt_meta_cap(struct file *file, void *priv,
			  struct v4l2_format *f)
{
	struct vivid_dev *dev = video_drvdata(file);
	struct v4l2_meta_format *meta = &f->fmt.meta;

	if (!vivid_is_webcam(dev) || !dev->has_meta_cap)
		return -EINVAL;

	meta->dataformat = V4L2_META_FMT_UVC;
	meta->buffersize = sizeof(struct vivid_uvc_meta_buf);
	return 0;
}

void vivid_meta_cap_fillbuff(struct vivid_dev *dev,
			     struct vivid_buffer *buf, u64 soe)
{
	struct vivid_uvc_meta_buf *meta = vb2_plane_vaddr(&buf->vb.vb2_buf, 0);
	int buf_off = 0;

	buf->vb.sequence = dev->meta_cap_seq_count;
	if (dev->field_cap == V4L2_FIELD_ALTERNATE)
		buf->vb.sequence /= 2;
	memset(meta, 1, vb2_plane_size(&buf->vb.vb2_buf, 0));

	meta->ns = ktime_get_ns();
	meta->sof = buf->vb.sequence * 30;
	meta->length = sizeof(*meta) - offsetof(struct vivid_uvc_meta_buf, length);
	meta->flags = UVC_STREAM_EOH | UVC_STREAM_EOF;

	if ((buf->vb.sequence % 2) == 0)
		meta->flags |= UVC_STREAM_FID;

	dprintk(dev, 2, "%s ns:%llu sof:%4d len:%u flags: 0x%02x",
		__func__, meta->ns, meta->sof, meta->length, meta->flags);
	if (dev->meta_pts) {
		meta->flags |= UVC_STREAM_PTS;
		meta->buf[0] = div_u64(soe, VIVID_META_CLOCK_UNIT);
		buf_off = 4;
		dprintk(dev, 2, " pts: %u\n", *(__u32 *)(meta->buf));
	}

	if (dev->meta_scr) {
		meta->flags |= UVC_STREAM_SCR;
		meta->buf[buf_off] = div_u64((soe + dev->cap_frame_eof_offset),
					     VIVID_META_CLOCK_UNIT);

		meta->buf[buf_off + 4] = (buf->vb.sequence * 30) % 1000;
		dprintk(dev, 2, " stc: %u, sof counter: %u\n",
			*(__u32 *)(meta->buf + buf_off),
			*(__u16 *)(meta->buf + buf_off + 4));
	}
	dprintk(dev, 2, "\n");
}