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path: root/drivers/media/platform/hisi/isp/isp-video.c
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#include <linux/slab.h>
#include <media/media-entity.h>
#include <media/v4l2-dev.h>
#include <media/v4l2-device.h>
#include <media/v4l2-ioctl.h>
#include <media/v4l2-mc.h>
#include <media/videobuf2-dma-sg.h>

#include "isp-video.h"
#include "isp.h"

/*
 * struct isp_format_info - ISP media bus format information
 * @code: V4L2 media bus format code
 * @pixelformat: V4L2 pixel format FCC identifier
 * @planes: Number of planes
 * @hsub: Horizontal subsampling (for each plane)
 * @vsub: Vertical subsampling (for each plane)
 * @bpp: Bits per pixel when stored in memory (for each plane)
 */
struct isp_format_info {
	char *name;
	u32 fourcc;
	u8 depth;
	u8 ybpp;
};

static const struct isp_format_info dummy_format[] = {
	{
		.name		= "YUV 4:2:2 planar, Y/Cb/Cr",
		.fourcc		= V4L2_PIX_FMT_YUV422P,
		.depth		= 16,
		.ybpp		= 1,
	},
};

/* -----------------------------------------------------------------------------
 * Helper functions
 */

static struct v4l2_subdev *video_remote_subdev(struct isp_video *video,
					       u32 *pad)
{
	struct media_pad *remote;

	pr_info("%s: %d\n", __func__, __LINE__);
	remote = media_entity_remote_pad(&video->pad);

	if (!remote || !is_media_entity_v4l2_subdev(remote->entity))
		return NULL;

	if (pad)
		*pad = remote->index;

	return media_entity_to_v4l2_subdev(remote->entity);
}

/* -----------------------------------------------------------------------------
 * 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 isp_video *video = vb2_get_drv_priv(q);
	struct isp_format_info *fmt = video->formats;
	const struct v4l2_pix_format *pix = &video->active_fmt.fmt.pix;

	pr_info("%s: %d\n", __func__, __LINE__);
	*num_planes = 1;

	sizes[0] = (pix->width * pix->height * fmt->depth) / 8;

	return 0;
}

static int video_buf_prepare(struct vb2_buffer *vb)
{
	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
	struct isp_video *video = vb2_get_drv_priv(vb->vb2_queue);
	const struct v4l2_pix_format *pix = &video->active_fmt.fmt.pix;

	pr_info("%s: %d\n", __func__, __LINE__);
	vb2_set_plane_payload(vb, 0, video->payload);

	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 isp_video *video = vb2_get_drv_priv(vb->vb2_queue);
	struct isp_buffer *buffer = container_of(vbuf, struct isp_buffer,
						   vb);
	pr_info("%s: %d\n", __func__, __LINE__);
	/* TODO: Push the buffer to hardware */
}

static int video_start_streaming(struct vb2_queue *q, unsigned int count)
{
	struct isp_video *video = vb2_get_drv_priv(q);
	struct video_device *vdev = &video->vdev;
	struct media_entity *entity;
	struct media_pad *pad;
	struct v4l2_subdev *subdev;
	int ret;

	pr_info("%s: %d\n", __func__, __LINE__);
	ret = media_pipeline_start(&vdev->entity, &video->pipe);
	if (ret < 0)
		return ret;

	pr_info("%s: %d\n", __func__, __LINE__);
	entity = &vdev->entity;
	while (1) {
		pad = &entity->pads[0];
		if (!(pad->flags & MEDIA_PAD_FL_SINK))
			break;

		pad = media_entity_remote_pad(pad);
		if (!pad || !is_media_entity_v4l2_subdev(pad->entity))
			break;

		entity = pad->entity;
		subdev = media_entity_to_v4l2_subdev(entity);

		ret = v4l2_subdev_call(subdev, video, s_stream, 1);
		if (ret < 0 && ret != -ENOIOCTLCMD)
			goto error;
	}

	pr_info("%s: %d\n", __func__, __LINE__);
	return 0;

error:
	media_pipeline_stop(&vdev->entity);

	video->ops->flush_buffers(video, VB2_BUF_STATE_QUEUED);

	return ret;
}

static void video_stop_streaming(struct vb2_queue *q)
{
	struct isp_video *video = vb2_get_drv_priv(q);
	struct video_device *vdev = &video->vdev;
	struct media_entity *entity;
	struct media_pad *pad;
	struct v4l2_subdev *subdev;

	entity = &vdev->entity;
	while (1) {
		pad = &entity->pads[0];
		if (!(pad->flags & MEDIA_PAD_FL_SINK))
			break;

		pad = media_entity_remote_pad(pad);
		if (!pad || !is_media_entity_v4l2_subdev(pad->entity))
			break;

		entity = pad->entity;
		subdev = media_entity_to_v4l2_subdev(entity);

		v4l2_subdev_call(subdev, video, s_stream, 0);
	}

	media_pipeline_stop(&vdev->entity);

	video->ops->flush_buffers(video, VB2_BUF_STATE_ERROR);
}

static const struct vb2_ops isp_video_vb2_q_ops = {
	.queue_setup     = video_queue_setup,
	.wait_prepare    = vb2_ops_wait_prepare,
	.wait_finish     = vb2_ops_wait_finish,
	.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)
{
	struct isp_video *video = video_drvdata(file);

	strlcpy(cap->driver, "hisi-isp", sizeof(cap->driver));
	strlcpy(cap->card, "HiSilicon ISP", sizeof(cap->card));
	snprintf(cap->bus_info, sizeof(cap->bus_info), "platform:%s",
		 dev_name(video->isp->dev));

	return 0;
}

static int video_enum_fmt(struct file *file, void *fh, struct v4l2_fmtdesc *f)
{
	struct isp_video *video = video_drvdata(file);

	f->pixelformat = video->formats->fourcc;

	return 0;
}

static int video_g_fmt(struct file *file, void *fh, struct v4l2_format *f)
{
	struct isp_video *video = video_drvdata(file);
	struct isp_format_info *fmt = video->formats;
	struct v4l2_pix_format *pix = &f->fmt.pix;

	pix->bytesperline = pix->width * fmt->ybpp;
	pix->sizeimage = (pix->width * pix->height * fmt->depth) / 8;

	pix->pixelformat = fmt->fourcc;
	pix->width = pix->width;
	pix->height = pix->height;
	pix->field = V4L2_FIELD_NONE;
	pix->colorspace = V4L2_COLORSPACE_JPEG;

	*f = video->active_fmt;

	return 0;
}

static int video_s_fmt(struct file *file, void *fh, struct v4l2_format *f)
{
	struct isp_video *video = video_drvdata(file);
	struct v4l2_pix_format *pix = &f->fmt.pix;

	/* TODO: Evaluate and set frame format from userspace */
	video->payload = pix->sizeimage; 
	video->active_fmt = *f;

	pr_info("Payload size set to: %d\n", video->payload);

	return 0;
}

static int video_enum_input(struct file *file, void *fh,
			    struct v4l2_input *input)
{
	if (input->index > 0)
		return -EINVAL;

	strlcpy(input->name, "camera", sizeof(input->name));
	input->type = V4L2_INPUT_TYPE_CAMERA;

	return 0;
}

static int video_try_fmt(struct file *file, void *fh, struct v4l2_format *f)
{
	struct isp_video *video = video_drvdata(file);

	return 0;
}

static int video_g_input(struct file *file, void *fh, unsigned int *input)
{
	*input = 0;

	return 0;
}

static int video_s_input(struct file *file, void *fh, unsigned int input)
{
	return input == 0 ? 0 : -EINVAL;
}

static const struct v4l2_ioctl_ops isp_vid_ioctl_ops = {
	.vidioc_querycap		= video_querycap,
	.vidioc_enum_fmt_vid_cap_mplane	= video_enum_fmt,
	.vidioc_g_fmt_vid_cap_mplane	= video_g_fmt,
	.vidioc_s_fmt_vid_cap_mplane	= video_s_fmt,
	.vidioc_try_fmt_vid_cap_mplane	= 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,
	.vidioc_enum_input		= video_enum_input,
	.vidioc_g_input			= video_g_input,
	.vidioc_s_input			= video_s_input,
};

/* -----------------------------------------------------------------------------
 * V4L2 file operations
 */

static int video_open(struct file *file)
{
	struct video_device *vdev = video_devdata(file);
	struct isp_video *video = video_drvdata(file);
	struct v4l2_fh *vfh;
	int ret;

	mutex_lock(&video->lock);

	vfh = kzalloc(sizeof(*vfh), GFP_KERNEL);
	if (vfh == NULL) {
		ret = -ENOMEM;
		goto error_alloc;
	}

	v4l2_fh_init(vfh, vdev);
	v4l2_fh_add(vfh);

	file->private_data = vfh;

	ret = v4l2_pipeline_pm_use(&vdev->entity, 1);
	if (ret < 0) {
		dev_err(video->isp->dev, "Failed to power up pipeline: %d\n",
			ret);
		goto error_pm_use;
	}

	mutex_unlock(&video->lock);

	return 0;

error_pm_use:
	v4l2_fh_release(file);

error_alloc:
	mutex_unlock(&video->lock);

	return ret;
}

static int video_release(struct file *file)
{
	struct video_device *vdev = video_devdata(file);

	vb2_fop_release(file);

	v4l2_pipeline_pm_use(&vdev->entity, 0);

	file->private_data = NULL;

	return 0;
}

static const struct v4l2_file_operations isp_vid_fops = {
	.owner          = THIS_MODULE,
	.unlocked_ioctl = video_ioctl2,
	.open           = video_open,
	.release        = video_release,
	.poll           = vb2_fop_poll,
	.mmap		= vb2_fop_mmap,
	.read		= vb2_fop_read,
};

/* -----------------------------------------------------------------------------
 * CAMSS video core
 */

static void isp_video_release(struct video_device *vdev)
{
	struct isp_video *video = video_get_drvdata(vdev);

	media_entity_cleanup(&vdev->entity);

	mutex_destroy(&video->q_lock);
	mutex_destroy(&video->lock);
}

/*
 * isp_video_init_format - Helper function to initialize format
 * @video: struct isp_video
 *
 * Initialize pad format with default value.
 *
 * Return 0 on success or a negative error code otherwise
 */
static int isp_video_init_format(struct isp_video *video)
{
	int ret;
	struct v4l2_format format = {
		.type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE,
		.fmt.pix = {
			.width = 1920,
			.height = 1080,
			.pixelformat = V4L2_PIX_FMT_YUV422P,
		},
	};

	video->active_fmt = format;

	return 0;
}

/*
 * isp_video_register - Register a video device node
 * @video: struct isp_video
 * @v4l2_dev: V4L2 device
 * @name: name to be used for the video device node
 *
 * Initialize and register a video device node to a V4L2 device. Also
 * initialize the vb2 queue.
 *
 * Return 0 on success or a negative error code otherwise
 */

int isp_video_register(struct isp_video *video, struct v4l2_device *v4l2_dev,
		       const char *name)
{
	struct media_pad *pad = &video->pad;
	struct video_device *vdev;
	struct vb2_queue *q;
	int ret;

	vdev = &video->vdev;

	mutex_init(&video->q_lock);

	q = &video->vb2_q;
	q->drv_priv = video;
	q->mem_ops = &vb2_dma_sg_memops;
	q->ops = &isp_video_vb2_q_ops;
	q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE;
	q->io_modes = VB2_DMABUF | VB2_MMAP | VB2_READ;
	q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
	q->buf_struct_size = sizeof(struct isp_buffer);
	q->dev = video->isp->dev;
	q->lock = &video->q_lock;
	ret = vb2_queue_init(q);
	if (ret < 0) {
		dev_err(v4l2_dev->dev, "Failed to init vb2 queue: %d\n", ret);
		goto error_vb2_init;
	}

	pad->flags = MEDIA_PAD_FL_SINK;
	ret = media_entity_pads_init(&vdev->entity, 1, pad);
	if (ret < 0) {
		dev_err(v4l2_dev->dev, "Failed to init video entity: %d\n",
			ret);
		goto error_media_init;
	}

	mutex_init(&video->lock);

	video->formats = dummy_format;
	video->nformats = ARRAY_SIZE(dummy_format);

	ret = isp_video_init_format(video);
	if (ret < 0) {
		dev_err(v4l2_dev->dev, "Failed to init format: %d\n", ret);
		goto error_video_register;
	}

	vdev->fops = &isp_vid_fops;
	vdev->device_caps = V4L2_CAP_VIDEO_CAPTURE_MPLANE | V4L2_CAP_STREAMING |
							V4L2_CAP_READWRITE;
	vdev->ioctl_ops = &isp_vid_ioctl_ops;
	vdev->release = isp_video_release;
	vdev->v4l2_dev = v4l2_dev;
	vdev->vfl_dir = VFL_DIR_RX;
	vdev->queue = &video->vb2_q;
	vdev->lock = &video->lock;
	strlcpy(vdev->name, name, sizeof(vdev->name));

	ret = video_register_device(vdev, VFL_TYPE_GRABBER, -1);
	if (ret < 0) {
		dev_err(v4l2_dev->dev, "Failed to register video device: %d\n",
			ret);
		goto error_video_register;
	}

	video_set_drvdata(vdev, video);

	return 0;

error_video_register:
	media_entity_cleanup(&vdev->entity);
	mutex_destroy(&video->lock);
error_media_init:
	vb2_queue_release(&video->vb2_q);
error_vb2_init:
	mutex_destroy(&video->q_lock);

	return ret;
}

void isp_video_stop_streaming(struct isp_video *video)
{
	if (vb2_is_streaming(&video->vb2_q))
		vb2_queue_release(&video->vb2_q);
}

void isp_video_unregister(struct isp_video *video)
{
	video_unregister_device(&video->vdev);
}