/*
 * Samsung S5P SoC series camera interface (camera capture) driver
 *
 * Copyright (c) 2010 Samsung Electronics Co., Ltd
 * Author: Sylwester Nawrocki, <s.nawrocki@samsung.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/version.h>
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/bug.h>
#include <linux/interrupt.h>
#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/list.h>
#include <linux/slab.h>
#include <linux/clk.h>
#include <linux/i2c.h>

#include <linux/videodev2.h>
#include <media/v4l2-device.h>
#include <media/v4l2-ioctl.h>
#include <media/v4l2-mem2mem.h>
#include <media/videobuf-core.h>
#include <media/videobuf-dma-contig.h>

#include "fimc-core.h"

static struct v4l2_subdev *fimc_subdev_register(struct fimc_dev *fimc,
					    struct s3c_fimc_isp_info *isp_info)
{
	struct i2c_adapter *i2c_adap;
	struct fimc_vid_cap *vid_cap = &fimc->vid_cap;
	struct v4l2_subdev *sd = NULL;

	i2c_adap = i2c_get_adapter(isp_info->i2c_bus_num);
	if (!i2c_adap)
		return ERR_PTR(-ENOMEM);

	sd = v4l2_i2c_new_subdev_board(&vid_cap->v4l2_dev, i2c_adap,
				       MODULE_NAME, isp_info->board_info, NULL);
	if (!sd) {
		v4l2_err(&vid_cap->v4l2_dev, "failed to acquire subdev\n");
		return NULL;
	}

	v4l2_info(&vid_cap->v4l2_dev, "subdevice %s registered successfuly\n",
		isp_info->board_info->type);

	return sd;
}

static void fimc_subdev_unregister(struct fimc_dev *fimc)
{
	struct fimc_vid_cap *vid_cap = &fimc->vid_cap;
	struct i2c_client *client;

	if (vid_cap->input_index < 0)
		return;	/* Subdevice already released or not registered. */

	if (vid_cap->sd) {
		v4l2_device_unregister_subdev(vid_cap->sd);
		client = v4l2_get_subdevdata(vid_cap->sd);
		i2c_unregister_device(client);
		i2c_put_adapter(client->adapter);
		vid_cap->sd = NULL;
	}

	vid_cap->input_index = -1;
}

/**
 * fimc_subdev_attach - attach v4l2_subdev to camera host interface
 *
 * @fimc: FIMC device information
 * @index: index to the array of available subdevices,
 *	   -1 for full array search or non negative value
 *	   to select specific subdevice
 */
static int fimc_subdev_attach(struct fimc_dev *fimc, int index)
{
	struct fimc_vid_cap *vid_cap = &fimc->vid_cap;
	struct s3c_platform_fimc *pdata = fimc->pdata;
	struct s3c_fimc_isp_info *isp_info;
	struct v4l2_subdev *sd;
	int i;

	for (i = 0; i < FIMC_MAX_CAMIF_CLIENTS; ++i) {
		isp_info = pdata->isp_info[i];

		if (!isp_info || (index >= 0 && i != index))
			continue;

		sd = fimc_subdev_register(fimc, isp_info);
		if (sd) {
			vid_cap->sd = sd;
			vid_cap->input_index = i;

			return 0;
		}
	}

	vid_cap->input_index = -1;
	vid_cap->sd = NULL;
	v4l2_err(&vid_cap->v4l2_dev, "fimc%d: sensor attach failed\n",
		 fimc->id);
	return -ENODEV;
}

static int fimc_isp_subdev_init(struct fimc_dev *fimc, int index)
{
	struct s3c_fimc_isp_info *isp_info;
	int ret;

	ret = fimc_subdev_attach(fimc, index);
	if (ret)
		return ret;

	isp_info = fimc->pdata->isp_info[fimc->vid_cap.input_index];
	ret = fimc_hw_set_camera_polarity(fimc, isp_info);
	if (!ret) {
		ret = v4l2_subdev_call(fimc->vid_cap.sd, core,
				       s_power, 1);
		if (!ret)
			return ret;
	}

	fimc_subdev_unregister(fimc);
	err("ISP initialization failed: %d", ret);
	return ret;
}

/*
 * At least one buffer on the pending_buf_q queue is required.
 * Locking: The caller holds fimc->slock spinlock.
 */
int fimc_vid_cap_buf_queue(struct fimc_dev *fimc,
			     struct fimc_vid_buffer *fimc_vb)
{
	struct fimc_vid_cap *cap = &fimc->vid_cap;
	struct fimc_ctx *ctx = cap->ctx;
	int ret = 0;

	BUG_ON(!fimc || !fimc_vb);

	ret = fimc_prepare_addr(ctx, fimc_vb, &ctx->d_frame,
				&fimc_vb->paddr);
	if (ret)
		return ret;

	if (test_bit(ST_CAPT_STREAM, &fimc->state)) {
		fimc_pending_queue_add(cap, fimc_vb);
	} else {
		/* Setup the buffer directly for processing. */
		int buf_id = (cap->reqbufs_count == 1) ? -1 : cap->buf_index;
		fimc_hw_set_output_addr(fimc, &fimc_vb->paddr, buf_id);

		fimc_vb->index = cap->buf_index;
		active_queue_add(cap, fimc_vb);

		if (++cap->buf_index >= FIMC_MAX_OUT_BUFS)
			cap->buf_index = 0;
	}
	return ret;
}

static int fimc_stop_capture(struct fimc_dev *fimc)
{
	unsigned long flags;
	struct fimc_vid_cap *cap;
	int ret;

	cap = &fimc->vid_cap;

	if (!fimc_capture_active(fimc))
		return 0;

	spin_lock_irqsave(&fimc->slock, flags);
	set_bit(ST_CAPT_SHUT, &fimc->state);
	fimc_deactivate_capture(fimc);
	spin_unlock_irqrestore(&fimc->slock, flags);

	wait_event_timeout(fimc->irq_queue,
			   test_bit(ST_CAPT_SHUT, &fimc->state),
			   FIMC_SHUTDOWN_TIMEOUT);

	ret = v4l2_subdev_call(cap->sd, video, s_stream, 0);
	if (ret)
		v4l2_err(&fimc->vid_cap.v4l2_dev, "s_stream(0) failed\n");

	spin_lock_irqsave(&fimc->slock, flags);
	fimc->state &= ~(1 << ST_CAPT_RUN | 1 << ST_CAPT_PEND |
			1 << ST_CAPT_STREAM);

	fimc->vid_cap.active_buf_cnt = 0;
	spin_unlock_irqrestore(&fimc->slock, flags);

	dbg("state: 0x%lx", fimc->state);
	return 0;
}

static int fimc_capture_open(struct file *file)
{
	struct fimc_dev *fimc = video_drvdata(file);
	int ret = 0;

	dbg("pid: %d, state: 0x%lx", task_pid_nr(current), fimc->state);

	/* Return if the corresponding video mem2mem node is already opened. */
	if (fimc_m2m_active(fimc))
		return -EBUSY;

	if (mutex_lock_interruptible(&fimc->lock))
		return -ERESTARTSYS;

	if (++fimc->vid_cap.refcnt == 1) {
		ret = fimc_isp_subdev_init(fimc, -1);
		if (ret) {
			fimc->vid_cap.refcnt--;
			ret = -EIO;
		}
	}

	file->private_data = fimc->vid_cap.ctx;

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

static int fimc_capture_close(struct file *file)
{
	struct fimc_dev *fimc = video_drvdata(file);

	if (mutex_lock_interruptible(&fimc->lock))
		return -ERESTARTSYS;

	dbg("pid: %d, state: 0x%lx", task_pid_nr(current), fimc->state);

	if (--fimc->vid_cap.refcnt == 0) {
		fimc_stop_capture(fimc);

		videobuf_stop(&fimc->vid_cap.vbq);
		videobuf_mmap_free(&fimc->vid_cap.vbq);

		v4l2_err(&fimc->vid_cap.v4l2_dev, "releasing ISP\n");
		v4l2_subdev_call(fimc->vid_cap.sd, core, s_power, 0);
		fimc_subdev_unregister(fimc);
	}

	mutex_unlock(&fimc->lock);
	return 0;
}

static unsigned int fimc_capture_poll(struct file *file,
				      struct poll_table_struct *wait)
{
	struct fimc_ctx *ctx = file->private_data;
	struct fimc_dev *fimc = ctx->fimc_dev;
	struct fimc_vid_cap *cap = &fimc->vid_cap;
	int ret;

	if (mutex_lock_interruptible(&fimc->lock))
		return POLLERR;

	ret = videobuf_poll_stream(file, &cap->vbq, wait);
	mutex_unlock(&fimc->lock);

	return ret;
}

static int fimc_capture_mmap(struct file *file, struct vm_area_struct *vma)
{
	struct fimc_ctx *ctx = file->private_data;
	struct fimc_dev *fimc = ctx->fimc_dev;
	struct fimc_vid_cap *cap = &fimc->vid_cap;
	int ret;

	if (mutex_lock_interruptible(&fimc->lock))
		return -ERESTARTSYS;

	ret = videobuf_mmap_mapper(&cap->vbq, vma);
	mutex_unlock(&fimc->lock);

	return ret;
}

/* video device file operations */
static const struct v4l2_file_operations fimc_capture_fops = {
	.owner		= THIS_MODULE,
	.open		= fimc_capture_open,
	.release	= fimc_capture_close,
	.poll		= fimc_capture_poll,
	.unlocked_ioctl	= video_ioctl2,
	.mmap		= fimc_capture_mmap,
};

static int fimc_vidioc_querycap_capture(struct file *file, void *priv,
					struct v4l2_capability *cap)
{
	struct fimc_ctx *ctx = file->private_data;
	struct fimc_dev *fimc = ctx->fimc_dev;

	strncpy(cap->driver, fimc->pdev->name, sizeof(cap->driver) - 1);
	strncpy(cap->card, fimc->pdev->name, sizeof(cap->card) - 1);
	cap->bus_info[0] = 0;
	cap->version = KERNEL_VERSION(1, 0, 0);
	cap->capabilities = V4L2_CAP_STREAMING | V4L2_CAP_VIDEO_CAPTURE;

	return 0;
}

/* Synchronize formats of the camera interface input and attached  sensor. */
static int sync_capture_fmt(struct fimc_ctx *ctx)
{
	struct fimc_frame *frame = &ctx->s_frame;
	struct fimc_dev *fimc = ctx->fimc_dev;
	struct v4l2_mbus_framefmt *fmt = &fimc->vid_cap.fmt;
	int ret;

	fmt->width  = ctx->d_frame.o_width;
	fmt->height = ctx->d_frame.o_height;

	ret = v4l2_subdev_call(fimc->vid_cap.sd, video, s_mbus_fmt, fmt);
	if (ret == -ENOIOCTLCMD) {
		err("s_mbus_fmt failed");
		return ret;
	}
	dbg("w: %d, h: %d, code= %d", fmt->width, fmt->height, fmt->code);

	frame->fmt = find_mbus_format(fmt, FMT_FLAGS_CAM);
	if (!frame->fmt) {
		err("fimc source format not found\n");
		return -EINVAL;
	}

	frame->f_width	= fmt->width;
	frame->f_height = fmt->height;
	frame->width	= fmt->width;
	frame->height	= fmt->height;
	frame->o_width	= fmt->width;
	frame->o_height = fmt->height;
	frame->offs_h	= 0;
	frame->offs_v	= 0;

	return 0;
}

static int fimc_cap_s_fmt(struct file *file, void *priv,
			     struct v4l2_format *f)
{
	struct fimc_ctx *ctx = priv;
	struct fimc_dev *fimc = ctx->fimc_dev;
	struct fimc_frame *frame;
	struct v4l2_pix_format *pix;
	int ret;

	if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
		return -EINVAL;

	ret = fimc_vidioc_try_fmt(file, priv, f);
	if (ret)
		return ret;

	if (mutex_lock_interruptible(&fimc->lock))
		return -ERESTARTSYS;

	if (fimc_capture_active(fimc)) {
		ret = -EBUSY;
		goto sf_unlock;
	}

	frame = &ctx->d_frame;

	pix = &f->fmt.pix;
	frame->fmt = find_format(f, FMT_FLAGS_M2M | FMT_FLAGS_CAM);
	if (!frame->fmt) {
		err("fimc target format not found\n");
		ret = -EINVAL;
		goto sf_unlock;
	}

	/* Output DMA frame pixel size and offsets. */
	frame->f_width	= pix->bytesperline * 8 / frame->fmt->depth;
	frame->f_height = pix->height;
	frame->width	= pix->width;
	frame->height	= pix->height;
	frame->o_width	= pix->width;
	frame->o_height = pix->height;
	frame->size	= (pix->width * pix->height * frame->fmt->depth) >> 3;
	frame->offs_h	= 0;
	frame->offs_v	= 0;

	ret = sync_capture_fmt(ctx);

	ctx->state |= (FIMC_PARAMS | FIMC_DST_FMT);

sf_unlock:
	mutex_unlock(&fimc->lock);
	return ret;
}

static int fimc_cap_enum_input(struct file *file, void *priv,
				     struct v4l2_input *i)
{
	struct fimc_ctx *ctx = priv;
	struct s3c_platform_fimc *pldata = ctx->fimc_dev->pdata;
	struct s3c_fimc_isp_info *isp_info;

	if (i->index >= FIMC_MAX_CAMIF_CLIENTS)
		return -EINVAL;

	isp_info = pldata->isp_info[i->index];
	if (isp_info == NULL)
		return -EINVAL;

	i->type = V4L2_INPUT_TYPE_CAMERA;
	strncpy(i->name, isp_info->board_info->type, 32);
	return 0;
}

static int fimc_cap_s_input(struct file *file, void *priv,
				  unsigned int i)
{
	struct fimc_ctx *ctx = priv;
	struct fimc_dev *fimc = ctx->fimc_dev;
	struct s3c_platform_fimc *pdata = fimc->pdata;
	int ret;

	if (fimc_capture_active(ctx->fimc_dev))
		return -EBUSY;

	if (mutex_lock_interruptible(&fimc->lock))
		return -ERESTARTSYS;

	if (i >= FIMC_MAX_CAMIF_CLIENTS || !pdata->isp_info[i]) {
		ret = -EINVAL;
		goto si_unlock;
	}

	if (fimc->vid_cap.sd) {
		ret = v4l2_subdev_call(fimc->vid_cap.sd, core, s_power, 0);
		if (ret)
			err("s_power failed: %d", ret);
	}

	/* Release the attached sensor subdevice. */
	fimc_subdev_unregister(fimc);

	ret = fimc_isp_subdev_init(fimc, i);

si_unlock:
	mutex_unlock(&fimc->lock);
	return ret;
}

static int fimc_cap_g_input(struct file *file, void *priv,
				       unsigned int *i)
{
	struct fimc_ctx *ctx = priv;
	struct fimc_vid_cap *cap = &ctx->fimc_dev->vid_cap;

	*i = cap->input_index;
	return 0;
}

static int fimc_cap_streamon(struct file *file, void *priv,
			   enum v4l2_buf_type type)
{
	struct s3c_fimc_isp_info *isp_info;
	struct fimc_ctx *ctx = priv;
	struct fimc_dev *fimc = ctx->fimc_dev;
	int ret = -EBUSY;

	if (mutex_lock_interruptible(&fimc->lock))
		return -ERESTARTSYS;

	if (fimc_capture_active(fimc) || !fimc->vid_cap.sd)
		goto s_unlock;

	if (!(ctx->state & FIMC_DST_FMT)) {
		v4l2_err(&fimc->vid_cap.v4l2_dev, "Format is not set\n");
		ret = -EINVAL;
		goto s_unlock;
	}

	ret = v4l2_subdev_call(fimc->vid_cap.sd, video, s_stream, 1);
	if (ret && ret != -ENOIOCTLCMD)
		goto s_unlock;

	ret = fimc_prepare_config(ctx, ctx->state);
	if (ret)
		goto s_unlock;

	isp_info = fimc->pdata->isp_info[fimc->vid_cap.input_index];
	fimc_hw_set_camera_type(fimc, isp_info);
	fimc_hw_set_camera_source(fimc, isp_info);
	fimc_hw_set_camera_offset(fimc, &ctx->s_frame);

	if (ctx->state & FIMC_PARAMS) {
		ret = fimc_set_scaler_info(ctx);
		if (ret) {
			err("Scaler setup error");
			goto s_unlock;
		}
		fimc_hw_set_input_path(ctx);
		fimc_hw_set_scaler(ctx);
		fimc_hw_set_target_format(ctx);
		fimc_hw_set_rotation(ctx);
		fimc_hw_set_effect(ctx);
	}

	fimc_hw_set_output_path(ctx);
	fimc_hw_set_out_dma(ctx);

	INIT_LIST_HEAD(&fimc->vid_cap.pending_buf_q);
	INIT_LIST_HEAD(&fimc->vid_cap.active_buf_q);
	fimc->vid_cap.active_buf_cnt = 0;
	fimc->vid_cap.frame_count = 0;

	set_bit(ST_CAPT_PEND, &fimc->state);
	ret = videobuf_streamon(&fimc->vid_cap.vbq);

s_unlock:
	mutex_unlock(&fimc->lock);
	return ret;
}

static int fimc_cap_streamoff(struct file *file, void *priv,
			    enum v4l2_buf_type type)
{
	struct fimc_ctx *ctx = priv;
	struct fimc_dev *fimc = ctx->fimc_dev;
	struct fimc_vid_cap *cap = &fimc->vid_cap;
	unsigned long flags;
	int ret;

	spin_lock_irqsave(&fimc->slock, flags);
	if (!fimc_capture_running(fimc) && !fimc_capture_pending(fimc)) {
		spin_unlock_irqrestore(&fimc->slock, flags);
		dbg("state: 0x%lx", fimc->state);
		return -EINVAL;
	}
	spin_unlock_irqrestore(&fimc->slock, flags);

	if (mutex_lock_interruptible(&fimc->lock))
		return -ERESTARTSYS;

	fimc_stop_capture(fimc);
	ret = videobuf_streamoff(&cap->vbq);
	mutex_unlock(&fimc->lock);
	return ret;
}

static int fimc_cap_reqbufs(struct file *file, void *priv,
			  struct v4l2_requestbuffers *reqbufs)
{
	struct fimc_ctx *ctx = priv;
	struct fimc_dev *fimc = ctx->fimc_dev;
	struct fimc_vid_cap *cap = &fimc->vid_cap;
	int ret;

	if (fimc_capture_active(ctx->fimc_dev))
		return -EBUSY;

	if (mutex_lock_interruptible(&fimc->lock))
		return -ERESTARTSYS;

	ret = videobuf_reqbufs(&cap->vbq, reqbufs);
	if (!ret)
		cap->reqbufs_count = reqbufs->count;

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

static int fimc_cap_querybuf(struct file *file, void *priv,
			   struct v4l2_buffer *buf)
{
	struct fimc_ctx *ctx = priv;
	struct fimc_vid_cap *cap = &ctx->fimc_dev->vid_cap;

	if (fimc_capture_active(ctx->fimc_dev))
		return -EBUSY;

	return videobuf_querybuf(&cap->vbq, buf);
}

static int fimc_cap_qbuf(struct file *file, void *priv,
			  struct v4l2_buffer *buf)
{
	struct fimc_ctx *ctx = priv;
	struct fimc_dev *fimc = ctx->fimc_dev;
	struct fimc_vid_cap *cap = &fimc->vid_cap;
	int ret;

	if (mutex_lock_interruptible(&fimc->lock))
		return -ERESTARTSYS;

	ret = videobuf_qbuf(&cap->vbq, buf);

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

static int fimc_cap_dqbuf(struct file *file, void *priv,
			   struct v4l2_buffer *buf)
{
	struct fimc_ctx *ctx = priv;
	int ret;

	if (mutex_lock_interruptible(&ctx->fimc_dev->lock))
		return -ERESTARTSYS;

	ret = videobuf_dqbuf(&ctx->fimc_dev->vid_cap.vbq, buf,
		file->f_flags & O_NONBLOCK);

	mutex_unlock(&ctx->fimc_dev->lock);
	return ret;
}

static int fimc_cap_s_ctrl(struct file *file, void *priv,
			 struct v4l2_control *ctrl)
{
	struct fimc_ctx *ctx = priv;
	int ret = -EINVAL;

	if (mutex_lock_interruptible(&ctx->fimc_dev->lock))
		return -ERESTARTSYS;

	/* Allow any controls but 90/270 rotation while streaming */
	if (!fimc_capture_active(ctx->fimc_dev) ||
	    ctrl->id != V4L2_CID_ROTATE ||
	    (ctrl->value != 90 && ctrl->value != 270)) {
		ret = check_ctrl_val(ctx, ctrl);
		if (!ret) {
			ret = fimc_s_ctrl(ctx, ctrl);
			if (!ret)
				ctx->state |= FIMC_PARAMS;
		}
	}
	if (ret == -EINVAL)
		ret = v4l2_subdev_call(ctx->fimc_dev->vid_cap.sd,
				       core, s_ctrl, ctrl);

	mutex_unlock(&ctx->fimc_dev->lock);
	return ret;
}

static int fimc_cap_s_crop(struct file *file, void *fh,
			       struct v4l2_crop *cr)
{
	struct fimc_frame *f;
	struct fimc_ctx *ctx = file->private_data;
	struct fimc_dev *fimc = ctx->fimc_dev;
	int ret = -EINVAL;

	if (fimc_capture_active(fimc))
		return -EBUSY;

	ret = fimc_try_crop(ctx, cr);
	if (ret)
		return ret;

	if (mutex_lock_interruptible(&fimc->lock))
		return -ERESTARTSYS;

	if (!(ctx->state & FIMC_DST_FMT)) {
		v4l2_err(&fimc->vid_cap.v4l2_dev,
			 "Capture color format not set\n");
		goto sc_unlock;
	}

	f = &ctx->s_frame;
	/* Check for the pixel scaling ratio when cropping input image. */
	ret = fimc_check_scaler_ratio(&cr->c, &ctx->d_frame);
	if (ret) {
		v4l2_err(&fimc->vid_cap.v4l2_dev, "Out of the scaler range");
	} else {
		ret = 0;
		f->offs_h = cr->c.left;
		f->offs_v = cr->c.top;
		f->width  = cr->c.width;
		f->height = cr->c.height;
	}

sc_unlock:
	mutex_unlock(&fimc->lock);
	return ret;
}


static const struct v4l2_ioctl_ops fimc_capture_ioctl_ops = {
	.vidioc_querycap		= fimc_vidioc_querycap_capture,

	.vidioc_enum_fmt_vid_cap	= fimc_vidioc_enum_fmt,
	.vidioc_try_fmt_vid_cap		= fimc_vidioc_try_fmt,
	.vidioc_s_fmt_vid_cap		= fimc_cap_s_fmt,
	.vidioc_g_fmt_vid_cap		= fimc_vidioc_g_fmt,

	.vidioc_reqbufs			= fimc_cap_reqbufs,
	.vidioc_querybuf		= fimc_cap_querybuf,

	.vidioc_qbuf			= fimc_cap_qbuf,
	.vidioc_dqbuf			= fimc_cap_dqbuf,

	.vidioc_streamon		= fimc_cap_streamon,
	.vidioc_streamoff		= fimc_cap_streamoff,

	.vidioc_queryctrl		= fimc_vidioc_queryctrl,
	.vidioc_g_ctrl			= fimc_vidioc_g_ctrl,
	.vidioc_s_ctrl			= fimc_cap_s_ctrl,

	.vidioc_g_crop			= fimc_vidioc_g_crop,
	.vidioc_s_crop			= fimc_cap_s_crop,
	.vidioc_cropcap			= fimc_vidioc_cropcap,

	.vidioc_enum_input		= fimc_cap_enum_input,
	.vidioc_s_input			= fimc_cap_s_input,
	.vidioc_g_input			= fimc_cap_g_input,
};

int fimc_register_capture_device(struct fimc_dev *fimc)
{
	struct v4l2_device *v4l2_dev = &fimc->vid_cap.v4l2_dev;
	struct video_device *vfd;
	struct fimc_vid_cap *vid_cap;
	struct fimc_ctx *ctx;
	struct v4l2_format f;
	int ret;

	ctx = kzalloc(sizeof *ctx, GFP_KERNEL);
	if (!ctx)
		return -ENOMEM;

	ctx->fimc_dev	 = fimc;
	ctx->in_path	 = FIMC_CAMERA;
	ctx->out_path	 = FIMC_DMA;
	ctx->state	 = FIMC_CTX_CAP;

	f.fmt.pix.pixelformat = V4L2_PIX_FMT_RGB24;
	ctx->d_frame.fmt = find_format(&f, FMT_FLAGS_M2M);

	if (!v4l2_dev->name[0])
		snprintf(v4l2_dev->name, sizeof(v4l2_dev->name),
			 "%s.capture", dev_name(&fimc->pdev->dev));

	ret = v4l2_device_register(NULL, v4l2_dev);
	if (ret)
		goto err_info;

	vfd = video_device_alloc();
	if (!vfd) {
		v4l2_err(v4l2_dev, "Failed to allocate video device\n");
		goto err_v4l2_reg;
	}

	snprintf(vfd->name, sizeof(vfd->name), "%s:cap",
		 dev_name(&fimc->pdev->dev));

	vfd->fops	= &fimc_capture_fops;
	vfd->ioctl_ops	= &fimc_capture_ioctl_ops;
	vfd->minor	= -1;
	vfd->release	= video_device_release;
	video_set_drvdata(vfd, fimc);

	vid_cap = &fimc->vid_cap;
	vid_cap->vfd = vfd;
	vid_cap->active_buf_cnt = 0;
	vid_cap->reqbufs_count  = 0;
	vid_cap->refcnt = 0;
	/* The default color format for image sensor. */
	vid_cap->fmt.code = V4L2_MBUS_FMT_YUYV8_2X8;

	INIT_LIST_HEAD(&vid_cap->pending_buf_q);
	INIT_LIST_HEAD(&vid_cap->active_buf_q);
	spin_lock_init(&ctx->slock);
	vid_cap->ctx = ctx;

	videobuf_queue_dma_contig_init(&vid_cap->vbq, &fimc_qops,
		vid_cap->v4l2_dev.dev, &fimc->irqlock,
		V4L2_BUF_TYPE_VIDEO_CAPTURE, V4L2_FIELD_NONE,
		sizeof(struct fimc_vid_buffer), (void *)ctx);

	ret = video_register_device(vfd, VFL_TYPE_GRABBER, -1);
	if (ret) {
		v4l2_err(v4l2_dev, "Failed to register video device\n");
		goto err_vd_reg;
	}

	v4l2_info(v4l2_dev,
		  "FIMC capture driver registered as /dev/video%d\n",
		  vfd->num);

	return 0;

err_vd_reg:
	video_device_release(vfd);
err_v4l2_reg:
	v4l2_device_unregister(v4l2_dev);
err_info:
	dev_err(&fimc->pdev->dev, "failed to install\n");
	return ret;
}

void fimc_unregister_capture_device(struct fimc_dev *fimc)
{
	struct fimc_vid_cap *capture = &fimc->vid_cap;

	if (capture->vfd)
		video_unregister_device(capture->vfd);

	kfree(capture->ctx);
}