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/*
 * V4L2 Deinterlacer Subdev for Freescale i.MX5/6 SOC
 *
 * Copyright (c) 2017 Mentor Graphics Inc.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 */
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/timer.h>
#include <media/v4l2-ctrls.h>
#include <media/v4l2-device.h>
#include <media/v4l2-ioctl.h>
#include <media/v4l2-mc.h>
#include <media/v4l2-subdev.h>
#include <media/imx.h>
#include "imx-media.h"

/*
 * This subdev implements two different video pipelines:
 *
 * CSI -> VDIC
 *
 * In this pipeline, the CSI sends a single interlaced field F(n-1)
 * directly to the VDIC (and optionally the following field F(n)
 * can be sent to memory via IDMAC channel 13). This pipeline only works
 * in VDIC's high motion mode, which only requires a single field for
 * processing. The other motion modes (low and medium) require three
 * fields, so this pipeline does not work in those modes. Also, it is
 * not clear how this pipeline can deal with the various field orders
 * (sequential BT/TB, interlaced BT/TB).
 *
 * MEM -> CH8,9,10 -> VDIC
 *
 * In this pipeline, previous field F(n-1), current field F(n), and next
 * field F(n+1) are transferred to the VDIC via IDMAC channels 8,9,10.
 * These memory buffers can come from a video output or mem2mem device.
 * All motion modes are supported by this pipeline.
 *
 * The "direct" CSI->VDIC pipeline requires no DMA, but it can only be
 * used in high motion mode.
 */

struct vdic_priv;

struct vdic_pipeline_ops {
	int (*setup)(struct vdic_priv *priv);
	void (*start)(struct vdic_priv *priv);
	void (*stop)(struct vdic_priv *priv);
	void (*disable)(struct vdic_priv *priv);
};

/*
 * Min/Max supported width and heights.
 */
#define MIN_W       176
#define MIN_H       144
#define MAX_W_VDIC  968
#define MAX_H_VDIC 2048
#define W_ALIGN    4 /* multiple of 16 pixels */
#define H_ALIGN    1 /* multiple of 2 lines */
#define S_ALIGN    1 /* multiple of 2 */

struct vdic_priv {
	struct device        *dev;
	struct ipu_soc       *ipu;
	struct imx_media_dev *md;
	struct v4l2_subdev   sd;
	struct media_pad pad[VDIC_NUM_PADS];
	int ipu_id;

	/* lock to protect all members below */
	struct mutex lock;

	/* IPU units we require */
	struct ipu_vdi *vdi;

	int active_input_pad;

	struct ipuv3_channel *vdi_in_ch_p; /* F(n-1) transfer channel */
	struct ipuv3_channel *vdi_in_ch;   /* F(n) transfer channel */
	struct ipuv3_channel *vdi_in_ch_n; /* F(n+1) transfer channel */

	/* pipeline operations */
	struct vdic_pipeline_ops *ops;

	/* current and previous input buffers indirect path */
	struct imx_media_buffer *curr_in_buf;
	struct imx_media_buffer *prev_in_buf;

	/*
	 * translated field type, input line stride, and field size
	 * for indirect path
	 */
	u32 fieldtype;
	u32 in_stride;
	u32 field_size;

	/* the source (a video device or subdev) */
	struct media_entity *src;
	/* the sink that will receive the progressive out buffers */
	struct v4l2_subdev *sink_sd;

	struct v4l2_mbus_framefmt format_mbus[VDIC_NUM_PADS];
	const struct imx_media_pixfmt *cc[VDIC_NUM_PADS];
	struct v4l2_fract frame_interval[VDIC_NUM_PADS];

	/* the video device at IDMAC input pad */
	struct imx_media_video_dev *vdev;

	bool csi_direct;  /* using direct CSI->VDIC->IC pipeline */

	/* motion select control */
	struct v4l2_ctrl_handler ctrl_hdlr;
	enum ipu_motion_sel motion;

	int stream_count;
};

static void vdic_put_ipu_resources(struct vdic_priv *priv)
{
	if (priv->vdi_in_ch_p)
		ipu_idmac_put(priv->vdi_in_ch_p);
	priv->vdi_in_ch_p = NULL;

	if (priv->vdi_in_ch)
		ipu_idmac_put(priv->vdi_in_ch);
	priv->vdi_in_ch = NULL;

	if (priv->vdi_in_ch_n)
		ipu_idmac_put(priv->vdi_in_ch_n);
	priv->vdi_in_ch_n = NULL;

	if (!IS_ERR_OR_NULL(priv->vdi))
		ipu_vdi_put(priv->vdi);
	priv->vdi = NULL;
}

static int vdic_get_ipu_resources(struct vdic_priv *priv)
{
	int ret, err_chan;
	struct ipuv3_channel *ch;
	struct ipu_vdi *vdi;

	priv->ipu = priv->md->ipu[priv->ipu_id];

	vdi = ipu_vdi_get(priv->ipu);
	if (IS_ERR(vdi)) {
		v4l2_err(&priv->sd, "failed to get VDIC\n");
		ret = PTR_ERR(vdi);
		goto out;
	}
	priv->vdi = vdi;

	if (!priv->csi_direct) {
		ch = ipu_idmac_get(priv->ipu, IPUV3_CHANNEL_MEM_VDI_PREV);
		if (IS_ERR(ch)) {
			err_chan = IPUV3_CHANNEL_MEM_VDI_PREV;
			ret = PTR_ERR(ch);
			goto out_err_chan;
		}
		priv->vdi_in_ch_p = ch;

		ch = ipu_idmac_get(priv->ipu, IPUV3_CHANNEL_MEM_VDI_CUR);
		if (IS_ERR(ch)) {
			err_chan = IPUV3_CHANNEL_MEM_VDI_CUR;
			ret = PTR_ERR(ch);
			goto out_err_chan;
		}
		priv->vdi_in_ch = ch;

		ch = ipu_idmac_get(priv->ipu, IPUV3_CHANNEL_MEM_VDI_NEXT);
		if (IS_ERR(priv->vdi_in_ch_n)) {
			err_chan = IPUV3_CHANNEL_MEM_VDI_NEXT;
			ret = PTR_ERR(ch);
			goto out_err_chan;
		}
		priv->vdi_in_ch_n = ch;
	}

	return 0;

out_err_chan:
	v4l2_err(&priv->sd, "could not get IDMAC channel %u\n", err_chan);
out:
	vdic_put_ipu_resources(priv);
	return ret;
}

/*
 * This function is currently unused, but will be called when the
 * output/mem2mem device at the IDMAC input pad sends us a new
 * buffer. It kicks off the IDMAC read channels to bring in the
 * buffer fields from memory and begin the conversions.
 */
static void __maybe_unused prepare_vdi_in_buffers(struct vdic_priv *priv,
						  struct imx_media_buffer *curr)
{
	dma_addr_t prev_phys, curr_phys, next_phys;
	struct imx_media_buffer *prev;
	struct vb2_buffer *curr_vb, *prev_vb;
	u32 fs = priv->field_size;
	u32 is = priv->in_stride;

	/* current input buffer is now previous */
	priv->prev_in_buf = priv->curr_in_buf;
	priv->curr_in_buf = curr;
	prev = priv->prev_in_buf ? priv->prev_in_buf : curr;

	prev_vb = &prev->vbuf.vb2_buf;
	curr_vb = &curr->vbuf.vb2_buf;

	switch (priv->fieldtype) {
	case V4L2_FIELD_SEQ_TB:
		prev_phys = vb2_dma_contig_plane_dma_addr(prev_vb, 0);
		curr_phys = vb2_dma_contig_plane_dma_addr(curr_vb, 0) + fs;
		next_phys = vb2_dma_contig_plane_dma_addr(curr_vb, 0);
		break;
	case V4L2_FIELD_SEQ_BT:
		prev_phys = vb2_dma_contig_plane_dma_addr(prev_vb, 0) + fs;
		curr_phys = vb2_dma_contig_plane_dma_addr(curr_vb, 0);
		next_phys = vb2_dma_contig_plane_dma_addr(curr_vb, 0) + fs;
		break;
	case V4L2_FIELD_INTERLACED_BT:
		prev_phys = vb2_dma_contig_plane_dma_addr(prev_vb, 0) + is;
		curr_phys = vb2_dma_contig_plane_dma_addr(curr_vb, 0);
		next_phys = vb2_dma_contig_plane_dma_addr(curr_vb, 0) + is;
		break;
	default:
		/* assume V4L2_FIELD_INTERLACED_TB */
		prev_phys = vb2_dma_contig_plane_dma_addr(prev_vb, 0);
		curr_phys = vb2_dma_contig_plane_dma_addr(curr_vb, 0) + is;
		next_phys = vb2_dma_contig_plane_dma_addr(curr_vb, 0);
		break;
	}

	ipu_cpmem_set_buffer(priv->vdi_in_ch_p, 0, prev_phys);
	ipu_cpmem_set_buffer(priv->vdi_in_ch,   0, curr_phys);
	ipu_cpmem_set_buffer(priv->vdi_in_ch_n, 0, next_phys);

	ipu_idmac_select_buffer(priv->vdi_in_ch_p, 0);
	ipu_idmac_select_buffer(priv->vdi_in_ch, 0);
	ipu_idmac_select_buffer(priv->vdi_in_ch_n, 0);
}

static int setup_vdi_channel(struct vdic_priv *priv,
			     struct ipuv3_channel *channel,
			     dma_addr_t phys0, dma_addr_t phys1)
{
	struct imx_media_video_dev *vdev = priv->vdev;
	unsigned int burst_size;
	struct ipu_image image;
	int ret;

	ipu_cpmem_zero(channel);

	memset(&image, 0, sizeof(image));
	image.pix = vdev->fmt.fmt.pix;
	/* one field to VDIC channels */
	image.pix.height /= 2;
	image.rect.width = image.pix.width;
	image.rect.height = image.pix.height;
	image.phys0 = phys0;
	image.phys1 = phys1;

	ret = ipu_cpmem_set_image(channel, &image);
	if (ret)
		return ret;

	burst_size = (image.pix.width & 0xf) ? 8 : 16;
	ipu_cpmem_set_burstsize(channel, burst_size);

	ipu_cpmem_set_axi_id(channel, 1);

	ipu_idmac_set_double_buffer(channel, false);

	return 0;
}

static int vdic_setup_direct(struct vdic_priv *priv)
{
	/* set VDIC to receive from CSI for direct path */
	ipu_fsu_link(priv->ipu, IPUV3_CHANNEL_CSI_DIRECT,
		     IPUV3_CHANNEL_CSI_VDI_PREV);

	return 0;
}

static void vdic_start_direct(struct vdic_priv *priv)
{
}

static void vdic_stop_direct(struct vdic_priv *priv)
{
}

static void vdic_disable_direct(struct vdic_priv *priv)
{
	ipu_fsu_unlink(priv->ipu, IPUV3_CHANNEL_CSI_DIRECT,
		       IPUV3_CHANNEL_CSI_VDI_PREV);
}

static int vdic_setup_indirect(struct vdic_priv *priv)
{
	struct v4l2_mbus_framefmt *infmt;
	const struct imx_media_pixfmt *incc;
	int in_size, ret;

	infmt = &priv->format_mbus[VDIC_SINK_PAD_IDMAC];
	incc = priv->cc[VDIC_SINK_PAD_IDMAC];

	in_size = (infmt->width * incc->bpp * infmt->height) >> 3;

	/* 1/2 full image size */
	priv->field_size = in_size / 2;
	priv->in_stride = incc->planar ?
		infmt->width : (infmt->width * incc->bpp) >> 3;

	priv->prev_in_buf = NULL;
	priv->curr_in_buf = NULL;

	priv->fieldtype = infmt->field;

	/* init the vdi-in channels */
	ret = setup_vdi_channel(priv, priv->vdi_in_ch_p, 0, 0);
	if (ret)
		return ret;
	ret = setup_vdi_channel(priv, priv->vdi_in_ch, 0, 0);
	if (ret)
		return ret;
	return setup_vdi_channel(priv, priv->vdi_in_ch_n, 0, 0);
}

static void vdic_start_indirect(struct vdic_priv *priv)
{
	/* enable the channels */
	ipu_idmac_enable_channel(priv->vdi_in_ch_p);
	ipu_idmac_enable_channel(priv->vdi_in_ch);
	ipu_idmac_enable_channel(priv->vdi_in_ch_n);
}

static void vdic_stop_indirect(struct vdic_priv *priv)
{
	/* disable channels */
	ipu_idmac_disable_channel(priv->vdi_in_ch_p);
	ipu_idmac_disable_channel(priv->vdi_in_ch);
	ipu_idmac_disable_channel(priv->vdi_in_ch_n);
}

static void vdic_disable_indirect(struct vdic_priv *priv)
{
}

static struct vdic_pipeline_ops direct_ops = {
	.setup = vdic_setup_direct,
	.start = vdic_start_direct,
	.stop = vdic_stop_direct,
	.disable = vdic_disable_direct,
};

static struct vdic_pipeline_ops indirect_ops = {
	.setup = vdic_setup_indirect,
	.start = vdic_start_indirect,
	.stop = vdic_stop_indirect,
	.disable = vdic_disable_indirect,
};

static int vdic_start(struct vdic_priv *priv)
{
	struct v4l2_mbus_framefmt *infmt;
	int ret;

	infmt = &priv->format_mbus[priv->active_input_pad];

	priv->ops = priv->csi_direct ? &direct_ops : &indirect_ops;

	ret = vdic_get_ipu_resources(priv);
	if (ret)
		return ret;

	/*
	 * init the VDIC.
	 *
	 * note we don't give infmt->code to ipu_vdi_setup(). The VDIC
	 * only supports 4:2:2 or 4:2:0, and this subdev will only
	 * negotiate 4:2:2 at its sink pads.
	 */
	ipu_vdi_setup(priv->vdi, MEDIA_BUS_FMT_UYVY8_2X8,
		      infmt->width, infmt->height);
	ipu_vdi_set_field_order(priv->vdi, V4L2_STD_UNKNOWN, infmt->field);
	ipu_vdi_set_motion(priv->vdi, priv->motion);

	ret = priv->ops->setup(priv);
	if (ret)
		goto out_put_ipu;

	ipu_vdi_enable(priv->vdi);

	priv->ops->start(priv);

	return 0;

out_put_ipu:
	vdic_put_ipu_resources(priv);
	return ret;
}

static void vdic_stop(struct vdic_priv *priv)
{
	priv->ops->stop(priv);
	ipu_vdi_disable(priv->vdi);
	priv->ops->disable(priv);

	vdic_put_ipu_resources(priv);
}

/*
 * V4L2 subdev operations.
 */

static int vdic_s_ctrl(struct v4l2_ctrl *ctrl)
{
	struct vdic_priv *priv = container_of(ctrl->handler,
					      struct vdic_priv, ctrl_hdlr);
	enum ipu_motion_sel motion;
	int ret = 0;

	mutex_lock(&priv->lock);

	switch (ctrl->id) {
	case V4L2_CID_DEINTERLACING_MODE:
		motion = ctrl->val;
		if (motion != priv->motion) {
			/* can't change motion control mid-streaming */
			if (priv->stream_count > 0) {
				ret = -EBUSY;
				goto out;
			}
			priv->motion = motion;
		}
		break;
	default:
		v4l2_err(&priv->sd, "Invalid control\n");
		ret = -EINVAL;
	}

out:
	mutex_unlock(&priv->lock);
	return ret;
}

static const struct v4l2_ctrl_ops vdic_ctrl_ops = {
	.s_ctrl = vdic_s_ctrl,
};

static const char * const vdic_ctrl_motion_menu[] = {
	"No Motion Compensation",
	"Low Motion",
	"Medium Motion",
	"High Motion",
};

static int vdic_init_controls(struct vdic_priv *priv)
{
	struct v4l2_ctrl_handler *hdlr = &priv->ctrl_hdlr;
	int ret;

	v4l2_ctrl_handler_init(hdlr, 1);

	v4l2_ctrl_new_std_menu_items(hdlr, &vdic_ctrl_ops,
				     V4L2_CID_DEINTERLACING_MODE,
				     HIGH_MOTION, 0, HIGH_MOTION,
				     vdic_ctrl_motion_menu);

	priv->sd.ctrl_handler = hdlr;

	if (hdlr->error) {
		ret = hdlr->error;
		goto out_free;
	}

	v4l2_ctrl_handler_setup(hdlr);
	return 0;

out_free:
	v4l2_ctrl_handler_free(hdlr);
	return ret;
}

static int vdic_s_stream(struct v4l2_subdev *sd, int enable)
{
	struct vdic_priv *priv = v4l2_get_subdevdata(sd);
	struct v4l2_subdev *src_sd = NULL;
	int ret = 0;

	mutex_lock(&priv->lock);

	if (!priv->src || !priv->sink_sd) {
		ret = -EPIPE;
		goto out;
	}

	if (priv->csi_direct)
		src_sd = media_entity_to_v4l2_subdev(priv->src);

	/*
	 * enable/disable streaming only if stream_count is
	 * going from 0 to 1 / 1 to 0.
	 */
	if (priv->stream_count != !enable)
		goto update_count;

	dev_dbg(priv->dev, "stream %s\n", enable ? "ON" : "OFF");

	if (enable)
		ret = vdic_start(priv);
	else
		vdic_stop(priv);
	if (ret)
		goto out;

	if (src_sd) {
		/* start/stop upstream */
		ret = v4l2_subdev_call(src_sd, video, s_stream, enable);
		ret = (ret && ret != -ENOIOCTLCMD) ? ret : 0;
		if (ret) {
			if (enable)
				vdic_stop(priv);
			goto out;
		}
	}

update_count:
	priv->stream_count += enable ? 1 : -1;
	if (priv->stream_count < 0)
		priv->stream_count = 0;
out:
	mutex_unlock(&priv->lock);
	return ret;
}

static struct v4l2_mbus_framefmt *
__vdic_get_fmt(struct vdic_priv *priv, struct v4l2_subdev_pad_config *cfg,
	       unsigned int pad, enum v4l2_subdev_format_whence which)
{
	if (which == V4L2_SUBDEV_FORMAT_TRY)
		return v4l2_subdev_get_try_format(&priv->sd, cfg, pad);
	else
		return &priv->format_mbus[pad];
}

static int vdic_enum_mbus_code(struct v4l2_subdev *sd,
			       struct v4l2_subdev_pad_config *cfg,
			       struct v4l2_subdev_mbus_code_enum *code)
{
	if (code->pad >= VDIC_NUM_PADS)
		return -EINVAL;

	return imx_media_enum_ipu_format(&code->code, code->index, CS_SEL_YUV);
}

static int vdic_get_fmt(struct v4l2_subdev *sd,
			struct v4l2_subdev_pad_config *cfg,
			struct v4l2_subdev_format *sdformat)
{
	struct vdic_priv *priv = v4l2_get_subdevdata(sd);
	struct v4l2_mbus_framefmt *fmt;
	int ret = 0;

	if (sdformat->pad >= VDIC_NUM_PADS)
		return -EINVAL;

	mutex_lock(&priv->lock);

	fmt = __vdic_get_fmt(priv, cfg, sdformat->pad, sdformat->which);
	if (!fmt) {
		ret = -EINVAL;
		goto out;
	}

	sdformat->format = *fmt;
out:
	mutex_unlock(&priv->lock);
	return ret;
}

static void vdic_try_fmt(struct vdic_priv *priv,
			 struct v4l2_subdev_pad_config *cfg,
			 struct v4l2_subdev_format *sdformat,
			 const struct imx_media_pixfmt **cc)
{
	struct v4l2_mbus_framefmt *infmt;

	*cc = imx_media_find_ipu_format(sdformat->format.code, CS_SEL_YUV);
	if (!*cc) {
		u32 code;

		imx_media_enum_ipu_format(&code, 0, CS_SEL_YUV);
		*cc = imx_media_find_ipu_format(code, CS_SEL_YUV);
		sdformat->format.code = (*cc)->codes[0];
	}

	infmt = __vdic_get_fmt(priv, cfg, priv->active_input_pad,
			       sdformat->which);

	switch (sdformat->pad) {
	case VDIC_SRC_PAD_DIRECT:
		sdformat->format = *infmt;
		/* output is always progressive! */
		sdformat->format.field = V4L2_FIELD_NONE;
		break;
	case VDIC_SINK_PAD_DIRECT:
	case VDIC_SINK_PAD_IDMAC:
		v4l_bound_align_image(&sdformat->format.width,
				      MIN_W, MAX_W_VDIC, W_ALIGN,
				      &sdformat->format.height,
				      MIN_H, MAX_H_VDIC, H_ALIGN, S_ALIGN);

		imx_media_fill_default_mbus_fields(&sdformat->format, infmt,
						   true);

		/* input must be interlaced! Choose SEQ_TB if not */
		if (!V4L2_FIELD_HAS_BOTH(sdformat->format.field))
			sdformat->format.field = V4L2_FIELD_SEQ_TB;
		break;
	}
}

static int vdic_set_fmt(struct v4l2_subdev *sd,
			struct v4l2_subdev_pad_config *cfg,
			struct v4l2_subdev_format *sdformat)
{
	struct vdic_priv *priv = v4l2_get_subdevdata(sd);
	const struct imx_media_pixfmt *cc;
	struct v4l2_mbus_framefmt *fmt;
	int ret = 0;

	if (sdformat->pad >= VDIC_NUM_PADS)
		return -EINVAL;

	mutex_lock(&priv->lock);

	if (priv->stream_count > 0) {
		ret = -EBUSY;
		goto out;
	}

	vdic_try_fmt(priv, cfg, sdformat, &cc);

	fmt = __vdic_get_fmt(priv, cfg, sdformat->pad, sdformat->which);
	*fmt = sdformat->format;

	/* propagate format to source pad */
	if (sdformat->pad == VDIC_SINK_PAD_DIRECT ||
	    sdformat->pad == VDIC_SINK_PAD_IDMAC) {
		const struct imx_media_pixfmt *outcc;
		struct v4l2_mbus_framefmt *outfmt;
		struct v4l2_subdev_format format;

		format.pad = VDIC_SRC_PAD_DIRECT;
		format.which = sdformat->which;
		format.format = sdformat->format;
		vdic_try_fmt(priv, cfg, &format, &outcc);

		outfmt = __vdic_get_fmt(priv, cfg, VDIC_SRC_PAD_DIRECT,
					sdformat->which);
		*outfmt = format.format;
		if (sdformat->which == V4L2_SUBDEV_FORMAT_ACTIVE)
			priv->cc[VDIC_SRC_PAD_DIRECT] = outcc;
	}

	if (sdformat->which == V4L2_SUBDEV_FORMAT_ACTIVE)
		priv->cc[sdformat->pad] = cc;
out:
	mutex_unlock(&priv->lock);
	return ret;
}

static int vdic_link_setup(struct media_entity *entity,
			    const struct media_pad *local,
			    const struct media_pad *remote, u32 flags)
{
	struct v4l2_subdev *sd = media_entity_to_v4l2_subdev(entity);
	struct vdic_priv *priv = v4l2_get_subdevdata(sd);
	struct v4l2_subdev *remote_sd;
	int ret = 0;

	dev_dbg(priv->dev, "link setup %s -> %s", remote->entity->name,
		local->entity->name);

	mutex_lock(&priv->lock);

	if (local->flags & MEDIA_PAD_FL_SOURCE) {
		if (!is_media_entity_v4l2_subdev(remote->entity)) {
			ret = -EINVAL;
			goto out;
		}

		remote_sd = media_entity_to_v4l2_subdev(remote->entity);

		if (flags & MEDIA_LNK_FL_ENABLED) {
			if (priv->sink_sd) {
				ret = -EBUSY;
				goto out;
			}
			priv->sink_sd = remote_sd;
		} else {
			priv->sink_sd = NULL;
		}

		goto out;
	}

	/* this is a sink pad */

	if (flags & MEDIA_LNK_FL_ENABLED) {
		if (priv->src) {
			ret = -EBUSY;
			goto out;
		}
	} else {
		priv->src = NULL;
		goto out;
	}

	if (local->index == VDIC_SINK_PAD_IDMAC) {
		struct imx_media_video_dev *vdev = priv->vdev;

		if (!is_media_entity_v4l2_video_device(remote->entity)) {
			ret = -EINVAL;
			goto out;
		}
		if (!vdev) {
			ret = -ENODEV;
			goto out;
		}

		priv->csi_direct = false;
	} else {
		if (!is_media_entity_v4l2_subdev(remote->entity)) {
			ret = -EINVAL;
			goto out;
		}

		remote_sd = media_entity_to_v4l2_subdev(remote->entity);

		/* direct pad must connect to a CSI */
		if (!(remote_sd->grp_id & IMX_MEDIA_GRP_ID_CSI) ||
		    remote->index != CSI_SRC_PAD_DIRECT) {
			ret = -EINVAL;
			goto out;
		}

		priv->csi_direct = true;
	}

	priv->src = remote->entity;
	/* record which input pad is now active */
	priv->active_input_pad = local->index;
out:
	mutex_unlock(&priv->lock);
	return ret;
}

static int vdic_link_validate(struct v4l2_subdev *sd,
			      struct media_link *link,
			      struct v4l2_subdev_format *source_fmt,
			      struct v4l2_subdev_format *sink_fmt)
{
	struct vdic_priv *priv = v4l2_get_subdevdata(sd);
	int ret;

	ret = v4l2_subdev_link_validate_default(sd, link,
						source_fmt, sink_fmt);
	if (ret)
		return ret;

	mutex_lock(&priv->lock);

	if (priv->csi_direct && priv->motion != HIGH_MOTION) {
		v4l2_err(&priv->sd,
			 "direct CSI pipeline requires high motion\n");
		ret = -EINVAL;
	}

	mutex_unlock(&priv->lock);
	return ret;
}

static int vdic_g_frame_interval(struct v4l2_subdev *sd,
				struct v4l2_subdev_frame_interval *fi)
{
	struct vdic_priv *priv = v4l2_get_subdevdata(sd);

	if (fi->pad >= VDIC_NUM_PADS)
		return -EINVAL;

	mutex_lock(&priv->lock);

	fi->interval = priv->frame_interval[fi->pad];

	mutex_unlock(&priv->lock);

	return 0;
}

static int vdic_s_frame_interval(struct v4l2_subdev *sd,
				struct v4l2_subdev_frame_interval *fi)
{
	struct vdic_priv *priv = v4l2_get_subdevdata(sd);
	struct v4l2_fract *input_fi, *output_fi;
	int ret = 0;

	mutex_lock(&priv->lock);

	input_fi = &priv->frame_interval[priv->active_input_pad];
	output_fi = &priv->frame_interval[VDIC_SRC_PAD_DIRECT];

	switch (fi->pad) {
	case VDIC_SINK_PAD_DIRECT:
	case VDIC_SINK_PAD_IDMAC:
		/* No limits on input frame interval */
		/* Reset output interval */
		*output_fi = fi->interval;
		if (priv->csi_direct)
			output_fi->denominator *= 2;
		break;
	case VDIC_SRC_PAD_DIRECT:
		/*
		 * frame rate at output pad is double input
		 * rate when using direct CSI->VDIC pipeline.
		 *
		 * TODO: implement VDIC frame skipping
		 */
		fi->interval = *input_fi;
		if (priv->csi_direct)
			fi->interval.denominator *= 2;
		break;
	default:
		ret = -EINVAL;
		goto out;
	}

	priv->frame_interval[fi->pad] = fi->interval;
out:
	mutex_unlock(&priv->lock);
	return ret;
}

/*
 * retrieve our pads parsed from the OF graph by the media device
 */
static int vdic_registered(struct v4l2_subdev *sd)
{
	struct vdic_priv *priv = v4l2_get_subdevdata(sd);
	int i, ret;
	u32 code;

	/* get media device */
	priv->md = dev_get_drvdata(sd->v4l2_dev->dev);

	for (i = 0; i < VDIC_NUM_PADS; i++) {
		priv->pad[i].flags = (i == VDIC_SRC_PAD_DIRECT) ?
			MEDIA_PAD_FL_SOURCE : MEDIA_PAD_FL_SINK;

		code = 0;
		if (i != VDIC_SINK_PAD_IDMAC)
			imx_media_enum_ipu_format(&code, 0, CS_SEL_YUV);

		/* set a default mbus format  */
		ret = imx_media_init_mbus_fmt(&priv->format_mbus[i],
					      640, 480, code, V4L2_FIELD_NONE,
					      &priv->cc[i]);
		if (ret)
			return ret;

		/* init default frame interval */
		priv->frame_interval[i].numerator = 1;
		priv->frame_interval[i].denominator = 30;
		if (i == VDIC_SRC_PAD_DIRECT)
			priv->frame_interval[i].denominator *= 2;
	}

	priv->active_input_pad = VDIC_SINK_PAD_DIRECT;

	ret = vdic_init_controls(priv);
	if (ret)
		return ret;

	ret = media_entity_pads_init(&sd->entity, VDIC_NUM_PADS, priv->pad);
	if (ret)
		v4l2_ctrl_handler_free(&priv->ctrl_hdlr);

	return ret;
}

static void vdic_unregistered(struct v4l2_subdev *sd)
{
	struct vdic_priv *priv = v4l2_get_subdevdata(sd);

	v4l2_ctrl_handler_free(&priv->ctrl_hdlr);
}

static const struct v4l2_subdev_pad_ops vdic_pad_ops = {
	.enum_mbus_code = vdic_enum_mbus_code,
	.get_fmt = vdic_get_fmt,
	.set_fmt = vdic_set_fmt,
	.link_validate = vdic_link_validate,
};

static const struct v4l2_subdev_video_ops vdic_video_ops = {
	.g_frame_interval = vdic_g_frame_interval,
	.s_frame_interval = vdic_s_frame_interval,
	.s_stream = vdic_s_stream,
};

static const struct media_entity_operations vdic_entity_ops = {
	.link_setup = vdic_link_setup,
	.link_validate = v4l2_subdev_link_validate,
};

static const struct v4l2_subdev_ops vdic_subdev_ops = {
	.video = &vdic_video_ops,
	.pad = &vdic_pad_ops,
};

static const struct v4l2_subdev_internal_ops vdic_internal_ops = {
	.registered = vdic_registered,
	.unregistered = vdic_unregistered,
};

static int imx_vdic_probe(struct platform_device *pdev)
{
	struct imx_media_internal_sd_platformdata *pdata;
	struct vdic_priv *priv;
	int ret;

	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
	if (!priv)
		return -ENOMEM;

	platform_set_drvdata(pdev, &priv->sd);
	priv->dev = &pdev->dev;

	pdata = priv->dev->platform_data;
	priv->ipu_id = pdata->ipu_id;

	v4l2_subdev_init(&priv->sd, &vdic_subdev_ops);
	v4l2_set_subdevdata(&priv->sd, priv);
	priv->sd.internal_ops = &vdic_internal_ops;
	priv->sd.entity.ops = &vdic_entity_ops;
	priv->sd.entity.function = MEDIA_ENT_F_PROC_VIDEO_PIXEL_FORMATTER;
	priv->sd.dev = &pdev->dev;
	priv->sd.owner = THIS_MODULE;
	priv->sd.flags = V4L2_SUBDEV_FL_HAS_DEVNODE;
	/* get our group id */
	priv->sd.grp_id = pdata->grp_id;
	strncpy(priv->sd.name, pdata->sd_name, sizeof(priv->sd.name));

	mutex_init(&priv->lock);

	ret = v4l2_async_register_subdev(&priv->sd);
	if (ret)
		goto free;

	return 0;
free:
	mutex_destroy(&priv->lock);
	return ret;
}

static int imx_vdic_remove(struct platform_device *pdev)
{
	struct v4l2_subdev *sd = platform_get_drvdata(pdev);
	struct vdic_priv *priv = v4l2_get_subdevdata(sd);

	v4l2_info(sd, "Removing\n");

	v4l2_async_unregister_subdev(sd);
	mutex_destroy(&priv->lock);
	media_entity_cleanup(&sd->entity);

	return 0;
}

static const struct platform_device_id imx_vdic_ids[] = {
	{ .name = "imx-ipuv3-vdic" },
	{ },
};
MODULE_DEVICE_TABLE(platform, imx_vdic_ids);

static struct platform_driver imx_vdic_driver = {
	.probe = imx_vdic_probe,
	.remove = imx_vdic_remove,
	.id_table = imx_vdic_ids,
	.driver = {
		.name = "imx-ipuv3-vdic",
	},
};
module_platform_driver(imx_vdic_driver);

MODULE_DESCRIPTION("i.MX VDIC subdev driver");
MODULE_AUTHOR("Steve Longerbeam <steve_longerbeam@mentor.com>");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:imx-ipuv3-vdic");