/*
 * Rockchip isp1 driver
 *
 * Copyright (C) 2017 Rockchip Electronics Co., Ltd.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#include <linux/kfifo.h>
#include <media/v4l2-common.h>
#include <media/v4l2-ioctl.h>
#include <media/videobuf2-core.h>
#include <media/videobuf2-vmalloc.h>	/* for ISP statistics */
#include "dev.h"
#include "regs.h"

#define RKISP1_ISP_STATS_REQ_BUFS_MIN 2
#define RKISP1_ISP_STATS_REQ_BUFS_MAX 8

static int rkisp1_stats_enum_fmt_meta_cap(struct file *file, void *priv,
					  struct v4l2_fmtdesc *f)
{
	struct video_device *video = video_devdata(file);
	struct rkisp1_isp_stats_vdev *stats_vdev = video_get_drvdata(video);

	if (f->index > 0 || f->type != video->queue->type)
		return -EINVAL;

	f->pixelformat = stats_vdev->vdev_fmt.fmt.meta.dataformat;
	return 0;
}

static int rkisp1_stats_g_fmt_meta_cap(struct file *file, void *priv,
				       struct v4l2_format *f)
{
	struct video_device *video = video_devdata(file);
	struct rkisp1_isp_stats_vdev *stats_vdev = video_get_drvdata(video);
	struct v4l2_meta_format *meta = &f->fmt.meta;

	if (f->type != video->queue->type)
		return -EINVAL;

	memset(meta, 0, sizeof(*meta));
	meta->dataformat = stats_vdev->vdev_fmt.fmt.meta.dataformat;
	meta->buffersize = stats_vdev->vdev_fmt.fmt.meta.buffersize;

	return 0;
}

static int rkisp1_stats_querycap(struct file *file,
				 void *priv, struct v4l2_capability *cap)
{
	struct video_device *vdev = video_devdata(file);
	struct rkisp1_isp_stats_vdev *stats_vdev = video_get_drvdata(vdev);

	strcpy(cap->driver, DRIVER_NAME);
	snprintf(cap->driver, sizeof(cap->driver),
		 "%s_v%d", DRIVER_NAME,
		 stats_vdev->dev->isp_ver >> 4);
	strlcpy(cap->card, vdev->name, sizeof(cap->card));
	strlcpy(cap->bus_info, "platform: " DRIVER_NAME, sizeof(cap->bus_info));

	return 0;
}

/* ISP video device IOCTLs */
static const struct v4l2_ioctl_ops rkisp1_stats_ioctl = {
	.vidioc_reqbufs = vb2_ioctl_reqbufs,
	.vidioc_querybuf = vb2_ioctl_querybuf,
	.vidioc_create_bufs = vb2_ioctl_create_bufs,
	.vidioc_qbuf = vb2_ioctl_qbuf,
	.vidioc_dqbuf = vb2_ioctl_dqbuf,
	.vidioc_prepare_buf = vb2_ioctl_prepare_buf,
	.vidioc_expbuf = vb2_ioctl_expbuf,
	.vidioc_streamon = vb2_ioctl_streamon,
	.vidioc_streamoff = vb2_ioctl_streamoff,
	.vidioc_enum_fmt_meta_cap = rkisp1_stats_enum_fmt_meta_cap,
	.vidioc_g_fmt_meta_cap = rkisp1_stats_g_fmt_meta_cap,
	.vidioc_s_fmt_meta_cap = rkisp1_stats_g_fmt_meta_cap,
	.vidioc_try_fmt_meta_cap = rkisp1_stats_g_fmt_meta_cap,
	.vidioc_querycap = rkisp1_stats_querycap
};

struct v4l2_file_operations rkisp1_stats_fops = {
	.mmap = vb2_fop_mmap,
	.unlocked_ioctl = video_ioctl2,
	.poll = vb2_fop_poll,
	.open = v4l2_fh_open,
	.release = vb2_fop_release
};

static int rkisp1_stats_vb2_queue_setup(struct vb2_queue *vq,
					unsigned int *num_buffers,
					unsigned int *num_planes,
					unsigned int sizes[],
					struct device *alloc_ctxs[])
{
	struct rkisp1_isp_stats_vdev *stats_vdev = vq->drv_priv;

	*num_planes = 1;

	*num_buffers = clamp_t(u32, *num_buffers, RKISP1_ISP_STATS_REQ_BUFS_MIN,
			       RKISP1_ISP_STATS_REQ_BUFS_MAX);

	sizes[0] = sizeof(struct rkisp1_stat_buffer);

	INIT_LIST_HEAD(&stats_vdev->stat);

	return 0;
}

static void rkisp1_stats_vb2_buf_queue(struct vb2_buffer *vb)
{
	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
	struct rkisp1_buffer *stats_buf = to_rkisp1_buffer(vbuf);
	struct vb2_queue *vq = vb->vb2_queue;
	struct rkisp1_isp_stats_vdev *stats_dev = vq->drv_priv;

	stats_buf->vaddr[0] = vb2_plane_vaddr(vb, 0);

	spin_lock_bh(&stats_dev->rd_lock);
	list_add_tail(&stats_buf->queue, &stats_dev->stat);
	spin_unlock_bh(&stats_dev->rd_lock);
}

static void rkisp1_stats_vb2_stop_streaming(struct vb2_queue *vq)
{
	struct rkisp1_isp_stats_vdev *stats_vdev = vq->drv_priv;
	struct rkisp1_buffer *buf;
	unsigned long flags;
	int i;

	/* Make sure no new work queued in isr before draining wq */
	spin_lock_irqsave(&stats_vdev->irq_lock, flags);
	stats_vdev->streamon = false;
	spin_unlock_irqrestore(&stats_vdev->irq_lock, flags);

	tasklet_disable(&stats_vdev->rd_tasklet);

	spin_lock_bh(&stats_vdev->rd_lock);
	for (i = 0; i < RKISP1_ISP_STATS_REQ_BUFS_MAX; i++) {
		if (list_empty(&stats_vdev->stat))
			break;
		buf = list_first_entry(&stats_vdev->stat,
				       struct rkisp1_buffer, queue);
		list_del(&buf->queue);
		vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
	}
	spin_unlock_bh(&stats_vdev->rd_lock);
}

static int
rkisp1_stats_vb2_start_streaming(struct vb2_queue *queue,
				 unsigned int count)
{
	struct rkisp1_isp_stats_vdev *stats_vdev = queue->drv_priv;

	stats_vdev->streamon = true;
	kfifo_reset(&stats_vdev->rd_kfifo);
	tasklet_enable(&stats_vdev->rd_tasklet);

	return 0;
}

static struct vb2_ops rkisp1_stats_vb2_ops = {
	.queue_setup = rkisp1_stats_vb2_queue_setup,
	.buf_queue = rkisp1_stats_vb2_buf_queue,
	.wait_prepare = vb2_ops_wait_prepare,
	.wait_finish = vb2_ops_wait_finish,
	.stop_streaming = rkisp1_stats_vb2_stop_streaming,
	.start_streaming = rkisp1_stats_vb2_start_streaming,
};

static int rkisp1_stats_init_vb2_queue(struct vb2_queue *q,
				       struct rkisp1_isp_stats_vdev *stats_vdev)
{
	q->type = V4L2_BUF_TYPE_META_CAPTURE;
	q->io_modes = VB2_MMAP | VB2_USERPTR;
	q->drv_priv = stats_vdev;
	q->ops = &rkisp1_stats_vb2_ops;
	q->mem_ops = &vb2_vmalloc_memops;
	q->buf_struct_size = sizeof(struct rkisp1_buffer);
	q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
	q->lock = &stats_vdev->dev->iqlock;
	q->dev = stats_vdev->dev->dev;

	return vb2_queue_init(q);
}

static void rkisp1_stats_get_awb_meas_v10(struct rkisp1_isp_stats_vdev *stats_vdev,
					  struct rkisp1_stat_buffer *pbuf)
{
	/* Protect against concurrent access from ISR? */
	u32 reg_val;

	pbuf->meas_type |= CIFISP_STAT_AWB;
	reg_val = readl(stats_vdev->dev->base_addr + CIF_ISP_AWB_WHITE_CNT_V10);
	pbuf->params.awb.awb_mean[0].cnt = CIF_ISP_AWB_GET_PIXEL_CNT(reg_val);
	reg_val = readl(stats_vdev->dev->base_addr + CIF_ISP_AWB_MEAN_V10);

	pbuf->params.awb.awb_mean[0].mean_cr_or_r =
		CIF_ISP_AWB_GET_MEAN_CR_R(reg_val);
	pbuf->params.awb.awb_mean[0].mean_cb_or_b =
		CIF_ISP_AWB_GET_MEAN_CB_B(reg_val);
	pbuf->params.awb.awb_mean[0].mean_y_or_g =
		CIF_ISP_AWB_GET_MEAN_Y_G(reg_val);
}

static void rkisp1_stats_get_awb_meas_v12(struct rkisp1_isp_stats_vdev *stats_vdev,
					  struct rkisp1_stat_buffer *pbuf)
{
	/* Protect against concurrent access from ISR? */
	u32 reg_val;

	pbuf->meas_type |= CIFISP_STAT_AWB;
	reg_val = readl(stats_vdev->dev->base_addr + CIF_ISP_AWB_WHITE_CNT_V12);
	pbuf->params.awb.awb_mean[0].cnt = CIF_ISP_AWB_GET_PIXEL_CNT(reg_val);
	reg_val = readl(stats_vdev->dev->base_addr + CIF_ISP_AWB_MEAN_V12);

	pbuf->params.awb.awb_mean[0].mean_cr_or_r =
		CIF_ISP_AWB_GET_MEAN_CR_R(reg_val);
	pbuf->params.awb.awb_mean[0].mean_cb_or_b =
		CIF_ISP_AWB_GET_MEAN_CB_B(reg_val);
	pbuf->params.awb.awb_mean[0].mean_y_or_g =
		CIF_ISP_AWB_GET_MEAN_Y_G(reg_val);
}

static void rkisp1_stats_get_aec_meas_v10(struct rkisp1_isp_stats_vdev *stats_vdev,
					  struct rkisp1_stat_buffer *pbuf)
{
	unsigned int i;
	void __iomem *addr = stats_vdev->dev->base_addr + CIF_ISP_EXP_MEAN_00_V10;

	pbuf->meas_type |= CIFISP_STAT_AUTOEXP;
	for (i = 0; i < stats_vdev->config->ae_mean_max; i++)
		pbuf->params.ae.exp_mean[i] = (u8)readl(addr + i * 4);
}

static void rkisp1_stats_get_aec_meas_v12(struct rkisp1_isp_stats_vdev *stats_vdev,
					  struct rkisp1_stat_buffer *pbuf)
{
	int i;
	void __iomem *addr = stats_vdev->dev->base_addr + CIF_ISP_EXP_MEAN_V12;
	u32 value;

	pbuf->meas_type |= CIFISP_STAT_AUTOEXP;
	for (i = 0; i < stats_vdev->config->ae_mean_max / 4; i++) {
		value = readl(addr + i * 4);
		pbuf->params.ae.exp_mean[4 * i + 0] = CIF_ISP_EXP_GET_MEAN_xy0_V12(value);
		pbuf->params.ae.exp_mean[4 * i + 1] = CIF_ISP_EXP_GET_MEAN_xy1_V12(value);
		pbuf->params.ae.exp_mean[4 * i + 2] = CIF_ISP_EXP_GET_MEAN_xy2_V12(value);
		pbuf->params.ae.exp_mean[4 * i + 3] = CIF_ISP_EXP_GET_MEAN_xy3_V12(value);
	}
	value = readl(addr + i * 4);
	pbuf->params.ae.exp_mean[4 * i + 0] = CIF_ISP_EXP_GET_MEAN_xy0_V12(value);
}

static void rkisp1_stats_get_afc_meas(struct rkisp1_isp_stats_vdev *stats_vdev,
				      struct rkisp1_stat_buffer *pbuf)
{
	void __iomem *base_addr;
	struct cifisp_af_stat *af;

	pbuf->meas_type |= CIFISP_STAT_AFM_FIN;

	af = &pbuf->params.af;
	base_addr = stats_vdev->dev->base_addr;
	af->window[0].sum = readl(base_addr + CIF_ISP_AFM_SUM_A);
	af->window[0].lum = readl(base_addr + CIF_ISP_AFM_LUM_A);
	af->window[1].sum = readl(base_addr + CIF_ISP_AFM_SUM_B);
	af->window[1].lum = readl(base_addr + CIF_ISP_AFM_LUM_B);
	af->window[2].sum = readl(base_addr + CIF_ISP_AFM_SUM_C);
	af->window[2].lum = readl(base_addr + CIF_ISP_AFM_LUM_C);
}

static void rkisp1_stats_get_hst_meas_v10(struct rkisp1_isp_stats_vdev *stats_vdev,
					  struct rkisp1_stat_buffer *pbuf)
{
	int i;
	void __iomem *addr = stats_vdev->dev->base_addr + CIF_ISP_HIST_BIN_0_V10;

	pbuf->meas_type |= CIFISP_STAT_HIST;
	for (i = 0; i < stats_vdev->config->hist_bin_n_max; i++)
		pbuf->params.hist.hist_bins[i] = readl(addr + (i * 4));
}

static void rkisp1_stats_get_hst_meas_v12(struct rkisp1_isp_stats_vdev *stats_vdev,
					  struct rkisp1_stat_buffer *pbuf)
{
	int i;
	void __iomem *addr = stats_vdev->dev->base_addr + CIF_ISP_HIST_BIN_V12;
	u32 value;

	pbuf->meas_type |= CIFISP_STAT_HIST;
	for (i = 0; i < stats_vdev->config->hist_bin_n_max / 2; i++) {
		value = readl(addr + (i * 4));
		pbuf->params.hist.hist_bins[2 * i] = CIF_ISP_HIST_GET_BIN0_V12(value);
		pbuf->params.hist.hist_bins[2 * i + 1] = CIF_ISP_HIST_GET_BIN1_V12(value);
	}
}

static void rkisp1_stats_get_bls_meas(struct rkisp1_isp_stats_vdev *stats_vdev,
				      struct rkisp1_stat_buffer *pbuf)
{
	struct rkisp1_device *dev = stats_vdev->dev;
	const struct ispsd_in_fmt *in_fmt =
			rkisp1_get_ispsd_in_fmt(&dev->isp_sdev);
	void __iomem *base = stats_vdev->dev->base_addr;
	struct cifisp_bls_meas_val *bls_val;

	bls_val = &pbuf->params.ae.bls_val;
	if (in_fmt->bayer_pat == RAW_BGGR) {
		bls_val->meas_b = readl(base + CIF_ISP_BLS_A_MEASURED);
		bls_val->meas_gb = readl(base + CIF_ISP_BLS_B_MEASURED);
		bls_val->meas_gr = readl(base + CIF_ISP_BLS_C_MEASURED);
		bls_val->meas_r = readl(base + CIF_ISP_BLS_D_MEASURED);
	} else if (in_fmt->bayer_pat == RAW_GBRG) {
		bls_val->meas_gb = readl(base + CIF_ISP_BLS_A_MEASURED);
		bls_val->meas_b = readl(base + CIF_ISP_BLS_B_MEASURED);
		bls_val->meas_r = readl(base + CIF_ISP_BLS_C_MEASURED);
		bls_val->meas_gr = readl(base + CIF_ISP_BLS_D_MEASURED);
	} else if (in_fmt->bayer_pat == RAW_GRBG) {
		bls_val->meas_gr = readl(base + CIF_ISP_BLS_A_MEASURED);
		bls_val->meas_r = readl(base + CIF_ISP_BLS_B_MEASURED);
		bls_val->meas_b = readl(base + CIF_ISP_BLS_C_MEASURED);
		bls_val->meas_gb = readl(base + CIF_ISP_BLS_D_MEASURED);
	} else if (in_fmt->bayer_pat == RAW_RGGB) {
		bls_val->meas_r = readl(base + CIF_ISP_BLS_A_MEASURED);
		bls_val->meas_gr = readl(base + CIF_ISP_BLS_B_MEASURED);
		bls_val->meas_gb = readl(base + CIF_ISP_BLS_C_MEASURED);
		bls_val->meas_b = readl(base + CIF_ISP_BLS_D_MEASURED);
	}
}

static void rkisp1_stats_get_emb_data(struct rkisp1_isp_stats_vdev *stats_vdev,
				      struct rkisp1_stat_buffer *pbuf)
{
	unsigned int i;
	struct rkisp1_device *dev = stats_vdev->dev;
	unsigned int ph = 0, out = 0, packet_len = 0, playload_len = 0;
	unsigned int mipi_kfifo_len;
	unsigned int idx;
	unsigned char *fifo_data;

	idx = RKISP1_EMDDATA_FIFO_MAX;
	for (i = 0; i < RKISP1_EMDDATA_FIFO_MAX; i++) {
		if (dev->emd_data_fifo[i].frame_id == pbuf->frame_id) {
			idx = i;
			break;
		}
	}

	if (idx == RKISP1_EMDDATA_FIFO_MAX)
		return;

	if (kfifo_is_empty(&dev->emd_data_fifo[idx].mipi_kfifo))
		return;

	mipi_kfifo_len = dev->emd_data_fifo[idx].data_len;
	fifo_data = &pbuf->params.emd.data[0];
	for (i = 0; i < mipi_kfifo_len;) {
		/* handle the package header */
		out = kfifo_out(&dev->emd_data_fifo[idx].mipi_kfifo,
				&ph, sizeof(ph));
		if (!out)
			break;
		packet_len = (ph >> 8) & 0xfff;
		i += sizeof(ph);

		/* handle the package data */
		out = kfifo_out(&dev->emd_data_fifo[idx].mipi_kfifo,
				fifo_data, packet_len);
		if (!out)
			break;

		i += packet_len;
		playload_len += packet_len;
		fifo_data += packet_len;

		v4l2_dbg(1, rkisp1_debug, &dev->v4l2_dev,
			 "packet_len: 0x%x, ph: 0x%x\n",
			 packet_len, ph);
	}

	pbuf->meas_type |= CIFISP_STAT_EMB_DATA;

	v4l2_dbg(1, rkisp1_debug, &dev->v4l2_dev,
		 "playload_len: %d, pbuf->frame_id %d\n",
		 playload_len, pbuf->frame_id);
}

static struct rkisp1_stats_ops rkisp1_v10_stats_ops = {
	.get_awb_meas = rkisp1_stats_get_awb_meas_v10,
	.get_aec_meas = rkisp1_stats_get_aec_meas_v10,
	.get_afc_meas = rkisp1_stats_get_afc_meas,
	.get_hst_meas = rkisp1_stats_get_hst_meas_v10,
	.get_bls_meas = rkisp1_stats_get_bls_meas,
	.get_emb_data = rkisp1_stats_get_emb_data,
};

static struct rkisp1_stats_ops rkisp1_v12_stats_ops = {
	.get_awb_meas = rkisp1_stats_get_awb_meas_v12,
	.get_aec_meas = rkisp1_stats_get_aec_meas_v12,
	.get_afc_meas = rkisp1_stats_get_afc_meas,
	.get_hst_meas = rkisp1_stats_get_hst_meas_v12,
	.get_bls_meas = rkisp1_stats_get_bls_meas,
};

static struct rkisp1_stats_config rkisp1_v10_stats_config = {
	.ae_mean_max = 25,
	.hist_bin_n_max = 16,
};

static struct rkisp1_stats_config rkisp1_v12_stats_config = {
	.ae_mean_max = 81,
	.hist_bin_n_max = 32,
};

static void
rkisp1_stats_send_measurement(struct rkisp1_isp_stats_vdev *stats_vdev,
			      struct rkisp1_isp_readout_work *meas_work)
{
	unsigned int cur_frame_id = -1;
	struct rkisp1_stat_buffer *cur_stat_buf;
	struct rkisp1_buffer *cur_buf = NULL;
	struct rkisp1_stats_ops *ops = stats_vdev->ops;

	cur_frame_id = atomic_read(&stats_vdev->dev->isp_sdev.frm_sync_seq) - 1;
	if (cur_frame_id != meas_work->frame_id) {
		v4l2_warn(stats_vdev->vnode.vdev.v4l2_dev,
			  "Measurement late(%d, %d)\n",
			  cur_frame_id, meas_work->frame_id);
		cur_frame_id = meas_work->frame_id;
	}

	spin_lock(&stats_vdev->rd_lock);
	/* get one empty buffer */
	if (!list_empty(&stats_vdev->stat)) {
		cur_buf = list_first_entry(&stats_vdev->stat,
					   struct rkisp1_buffer, queue);
		list_del(&cur_buf->queue);
	}
	spin_unlock(&stats_vdev->rd_lock);

	if (!cur_buf)
		return;

	cur_stat_buf =
		(struct rkisp1_stat_buffer *)(cur_buf->vaddr[0]);
	memset(cur_stat_buf, 0, sizeof(*cur_stat_buf));
	cur_stat_buf->frame_id = cur_frame_id;
	if (meas_work->isp_ris & CIF_ISP_AWB_DONE) {
		ops->get_awb_meas(stats_vdev, cur_stat_buf);
		cur_stat_buf->meas_type |= CIFISP_STAT_AWB;
	}

	if (meas_work->isp_ris & CIF_ISP_AFM_FIN) {
		ops->get_afc_meas(stats_vdev, cur_stat_buf);
		cur_stat_buf->meas_type |= CIFISP_STAT_AFM_FIN;
	}

	if (meas_work->isp_ris & CIF_ISP_EXP_END) {
		ops->get_aec_meas(stats_vdev, cur_stat_buf);
		ops->get_bls_meas(stats_vdev, cur_stat_buf);
		cur_stat_buf->meas_type |= CIFISP_STAT_AUTOEXP;
	}

	if (meas_work->isp_ris & CIF_ISP_HIST_MEASURE_RDY) {
		ops->get_hst_meas(stats_vdev, cur_stat_buf);
		cur_stat_buf->meas_type |= CIFISP_STAT_HIST;
	}

	if ((meas_work->isp_ris & CIF_ISP_FRAME) &&
		ops->get_emb_data)
		ops->get_emb_data(stats_vdev, cur_stat_buf);

	vb2_set_plane_payload(&cur_buf->vb.vb2_buf, 0,
			      sizeof(struct rkisp1_stat_buffer));
	cur_buf->vb.sequence = cur_frame_id;
	cur_buf->vb.vb2_buf.timestamp = meas_work->timestamp;
	vb2_buffer_done(&cur_buf->vb.vb2_buf, VB2_BUF_STATE_DONE);
}

static void rkisp1_stats_readout_task(unsigned long data)
{
	unsigned int out = 0;
	struct rkisp1_isp_readout_work work;
	struct rkisp1_isp_stats_vdev *vdev =
		(struct rkisp1_isp_stats_vdev *)data;

	while (!kfifo_is_empty(&vdev->rd_kfifo)) {
		out = kfifo_out(&vdev->rd_kfifo,
				&work, sizeof(work));
		if (!out)
			break;

		if (work.readout == RKISP1_ISP_READOUT_MEAS)
			rkisp1_stats_send_measurement(vdev, &work);
	}
}

int rkisp1_stats_isr(struct rkisp1_isp_stats_vdev *stats_vdev, u32 isp_ris)
{
	unsigned int isp_mis_tmp = 0;
	struct rkisp1_isp_readout_work work;
	unsigned int cur_frame_id =
		atomic_read(&stats_vdev->dev->isp_sdev.frm_sync_seq) - 1;
#ifdef LOG_ISR_EXE_TIME
	ktime_t in_t = ktime_get();
#endif

	spin_lock(&stats_vdev->irq_lock);

	isp_mis_tmp = isp_ris & (CIF_ISP_AWB_DONE | CIF_ISP_AFM_FIN |
			CIF_ISP_EXP_END | CIF_ISP_HIST_MEASURE_RDY);
	if (isp_mis_tmp) {
		writel(isp_mis_tmp,
			stats_vdev->dev->base_addr + CIF_ISP_ICR);

		isp_mis_tmp &= readl(stats_vdev->dev->base_addr + CIF_ISP_MIS);
		if (isp_mis_tmp)
			v4l2_err(stats_vdev->vnode.vdev.v4l2_dev,
				 "isp icr 3A info err: 0x%x 0x%x\n",
				 isp_mis_tmp, isp_ris);
	}

	if (!stats_vdev->streamon)
		goto unlock;

	if (isp_ris & (CIF_ISP_FRAME | CIF_ISP_AWB_DONE |
		CIF_ISP_AFM_FIN | CIF_ISP_EXP_END |
		CIF_ISP_HIST_MEASURE_RDY)) {
		work.readout = RKISP1_ISP_READOUT_MEAS;
		work.frame_id = cur_frame_id;
		work.isp_ris = isp_ris;
		work.timestamp = ktime_get_ns();
		if (!kfifo_is_full(&stats_vdev->rd_kfifo))
			kfifo_in(&stats_vdev->rd_kfifo,
				 &work, sizeof(work));
		else
			v4l2_err(stats_vdev->vnode.vdev.v4l2_dev,
				 "stats kfifo is full\n");

		tasklet_schedule(&stats_vdev->rd_tasklet);
	}

#ifdef LOG_ISR_EXE_TIME
	if (isp_ris & (CIF_ISP_EXP_END | CIF_ISP_AWB_DONE |
		       CIF_ISP_FRAME | CIF_ISP_HIST_MEASURE_RDY)) {
		unsigned int diff_us =
		    ktime_to_us(ktime_sub(ktime_get(), in_t));

		if (diff_us > g_longest_isr_time)
			g_longest_isr_time = diff_us;

		v4l2_info(stats_vdev->vnode.vdev.v4l2_dev,
			  "isp_isr time %d %d\n", diff_us, g_longest_isr_time);
	}
#endif

unlock:
	spin_unlock(&stats_vdev->irq_lock);

	return 0;
}

static void rkisp1_init_stats_vdev(struct rkisp1_isp_stats_vdev *stats_vdev)
{
	stats_vdev->vdev_fmt.fmt.meta.dataformat =
		V4L2_META_FMT_RK_ISP1_STAT_3A;
	stats_vdev->vdev_fmt.fmt.meta.buffersize =
		sizeof(struct rkisp1_stat_buffer);

	if (stats_vdev->dev->isp_ver == ISP_V12 ||
	    stats_vdev->dev->isp_ver == ISP_V13) {
		stats_vdev->ops = &rkisp1_v12_stats_ops;
		stats_vdev->config = &rkisp1_v12_stats_config;
	} else {
		stats_vdev->ops = &rkisp1_v10_stats_ops;
		stats_vdev->config = &rkisp1_v10_stats_config;
	}
}

int rkisp1_register_stats_vdev(struct rkisp1_isp_stats_vdev *stats_vdev,
			       struct v4l2_device *v4l2_dev,
			       struct rkisp1_device *dev)
{
	int ret;
	struct rkisp1_vdev_node *node = &stats_vdev->vnode;
	struct video_device *vdev = &node->vdev;

	stats_vdev->dev = dev;
	INIT_LIST_HEAD(&stats_vdev->stat);
	spin_lock_init(&stats_vdev->irq_lock);
	spin_lock_init(&stats_vdev->rd_lock);

	strlcpy(vdev->name, "rkisp1-statistics", sizeof(vdev->name));

	video_set_drvdata(vdev, stats_vdev);
	vdev->ioctl_ops = &rkisp1_stats_ioctl;
	vdev->fops = &rkisp1_stats_fops;
	vdev->release = video_device_release_empty;
	vdev->lock = &dev->iqlock;
	vdev->v4l2_dev = v4l2_dev;
	vdev->queue = &node->buf_queue;
	vdev->device_caps = V4L2_CAP_META_CAPTURE | V4L2_CAP_STREAMING;
	vdev->vfl_dir =  VFL_DIR_RX;
	rkisp1_stats_init_vb2_queue(vdev->queue, stats_vdev);
	rkisp1_init_stats_vdev(stats_vdev);
	video_set_drvdata(vdev, stats_vdev);

	node->pad.flags = MEDIA_PAD_FL_SINK;
	ret = media_entity_pads_init(&vdev->entity, 1, &node->pad);
	if (ret < 0)
		goto err_release_queue;

	ret = video_register_device(vdev, VFL_TYPE_VIDEO, -1);
	if (ret < 0) {
		dev_err(&vdev->dev,
			"could not register Video for Linux device\n");
		goto err_cleanup_media_entity;
	}

	ret = kfifo_alloc(&stats_vdev->rd_kfifo,
			  RKISP1_READOUT_WORK_SIZE,
			  GFP_KERNEL);
	if (ret) {
		dev_err(&vdev->dev,
			"kfifo_alloc failed with error %d\n",
			ret);
		goto err_cleanup_media_entity;
	}

	tasklet_init(&stats_vdev->rd_tasklet,
		     rkisp1_stats_readout_task,
		     (unsigned long)stats_vdev);
	tasklet_disable(&stats_vdev->rd_tasklet);

	return 0;

err_cleanup_media_entity:
	media_entity_cleanup(&vdev->entity);
err_release_queue:
	vb2_queue_release(vdev->queue);
	return ret;
}

void rkisp1_unregister_stats_vdev(struct rkisp1_isp_stats_vdev *stats_vdev)
{
	struct rkisp1_vdev_node *node = &stats_vdev->vnode;
	struct video_device *vdev = &node->vdev;

	kfifo_free(&stats_vdev->rd_kfifo);
	tasklet_kill(&stats_vdev->rd_tasklet);
	video_unregister_device(vdev);
	media_entity_cleanup(&vdev->entity);
	vb2_queue_release(vdev->queue);
}