/*
 * Copyright 2004-2014 Freescale Semiconductor, Inc. All Rights Reserved.
 */

/*
 * The code contained herein is licensed under the GNU General Public
 * License. You may obtain a copy of the GNU General Public License
 * Version 2 or later at the following locations:
 *
 * http://www.opensource.org/licenses/gpl-license.html
 * http://www.gnu.org/copyleft/gpl.html
 */

/*!
 * @file ipu_still.c
 *
 * @brief IPU Use case for still image capture
 *
 * @ingroup IPU
 */

#include <linux/module.h>
#include <linux/semaphore.h>
#include <linux/sched.h>
#include <linux/ipu.h>
#include "mxc_v4l2_capture.h"
#include "ipu_prp_sw.h"

static int callback_eof_flag;
#ifndef CONFIG_MXC_IPU_V1
static int buffer_num;
#endif

#ifdef CONFIG_MXC_IPU_V1
static int callback_flag;
/*
 * Function definitions
 */
/*!
 * CSI EOF callback function.
 *
 * @param irq       int irq line
 * @param dev_id    void * device id
 *
 * @return status   IRQ_HANDLED for handled
 */
static irqreturn_t prp_csi_eof_callback(int irq, void *dev_id)
{
	cam_data *cam = devid;
	ipu_select_buffer(cam->ipu, CSI_MEM, IPU_OUTPUT_BUFFER,
			  callback_flag%2 ? 1 : 0);
	if (callback_flag == 0)
		ipu_enable_channel(cam->ipu, CSI_MEM);

	callback_flag++;
	return IRQ_HANDLED;
}
#endif

/*!
 * CSI callback function.
 *
 * @param irq       int irq line
 * @param dev_id    void * device id
 *
 * @return status   IRQ_HANDLED for handled
 */
static irqreturn_t prp_still_callback(int irq, void *dev_id)
{
	cam_data *cam = (cam_data *) dev_id;

	callback_eof_flag++;
	if (callback_eof_flag < 5) {
#ifndef CONFIG_MXC_IPU_V1
		buffer_num = (buffer_num == 0) ? 1 : 0;
		ipu_select_buffer(cam->ipu, CSI_MEM,
				  IPU_OUTPUT_BUFFER, buffer_num);
#endif
	} else {
		cam->still_counter++;
		wake_up_interruptible(&cam->still_queue);
	}

	return IRQ_HANDLED;
}

/*!
 * start csi->mem task
 * @param private       struct cam_data * mxc capture instance
 *
 * @return  status
 */
static int prp_still_start(void *private)
{
	cam_data *cam = (cam_data *) private;
	u32 pixel_fmt;
	int err;
	ipu_channel_params_t params;

	if (cam->v2f.fmt.pix.pixelformat == V4L2_PIX_FMT_YUV420)
		pixel_fmt = IPU_PIX_FMT_YUV420P;
	else if (cam->v2f.fmt.pix.pixelformat == V4L2_PIX_FMT_NV12)
		pixel_fmt = IPU_PIX_FMT_NV12;
	else if (cam->v2f.fmt.pix.pixelformat == V4L2_PIX_FMT_YUV422P)
		pixel_fmt = IPU_PIX_FMT_YUV422P;
	else if (cam->v2f.fmt.pix.pixelformat == V4L2_PIX_FMT_UYVY)
		pixel_fmt = IPU_PIX_FMT_UYVY;
	else if (cam->v2f.fmt.pix.pixelformat == V4L2_PIX_FMT_YUYV)
		pixel_fmt = IPU_PIX_FMT_YUYV;
	else if (cam->v2f.fmt.pix.pixelformat == V4L2_PIX_FMT_BGR24)
		pixel_fmt = IPU_PIX_FMT_BGR24;
	else if (cam->v2f.fmt.pix.pixelformat == V4L2_PIX_FMT_RGB24)
		pixel_fmt = IPU_PIX_FMT_RGB24;
	else if (cam->v2f.fmt.pix.pixelformat == V4L2_PIX_FMT_RGB565)
		pixel_fmt = IPU_PIX_FMT_RGB565;
	else if (cam->v2f.fmt.pix.pixelformat == V4L2_PIX_FMT_BGR32)
		pixel_fmt = IPU_PIX_FMT_BGR32;
	else if (cam->v2f.fmt.pix.pixelformat == V4L2_PIX_FMT_RGB32)
		pixel_fmt = IPU_PIX_FMT_RGB32;
	else {
		printk(KERN_ERR "format not supported\n");
		return -EINVAL;
	}

	memset(&params, 0, sizeof(params));
	err = ipu_init_channel(cam->ipu, CSI_MEM, &params);
	if (err != 0)
		return err;

	err = ipu_init_channel_buffer(cam->ipu, CSI_MEM, IPU_OUTPUT_BUFFER,
				      pixel_fmt, cam->v2f.fmt.pix.width,
				      cam->v2f.fmt.pix.height,
				      cam->v2f.fmt.pix.width, IPU_ROTATE_NONE,
				      cam->still_buf[0], cam->still_buf[1], 0,
				      0, 0);
	if (err != 0)
		return err;

#ifdef CONFIG_MXC_IPU_V1
	ipu_clear_irq(IPU_IRQ_SENSOR_OUT_EOF);
	err = ipu_request_irq(IPU_IRQ_SENSOR_OUT_EOF, prp_still_callback,
			      0, "Mxc Camera", cam);
	if (err != 0) {
		printk(KERN_ERR "Error registering irq.\n");
		return err;
	}
	callback_flag = 0;
	callback_eof_flag = 0;
	ipu_clear_irq(IPU_IRQ_SENSOR_EOF);
	err = ipu_request_irq(IPU_IRQ_SENSOR_EOF, prp_csi_eof_callback,
			      0, "Mxc Camera", cam);
	if (err != 0) {
		printk(KERN_ERR "Error IPU_IRQ_SENSOR_EOF\n");
		return err;
	}
#else
	callback_eof_flag = 0;
	buffer_num = 0;

	ipu_clear_irq(cam->ipu, IPU_IRQ_CSI0_OUT_EOF);
	err = ipu_request_irq(cam->ipu, IPU_IRQ_CSI0_OUT_EOF,
			      prp_still_callback,
			      0, "Mxc Camera", cam);
	if (err != 0) {
		printk(KERN_ERR "Error registering irq.\n");
		return err;
	}

	ipu_select_buffer(cam->ipu, CSI_MEM, IPU_OUTPUT_BUFFER, 0);
	ipu_enable_channel(cam->ipu, CSI_MEM);
	ipu_enable_csi(cam->ipu, cam->csi);
#endif

	return err;
}

/*!
 * stop csi->mem encoder task
 * @param private       struct cam_data * mxc capture instance
 *
 * @return  status
 */
static int prp_still_stop(void *private)
{
	cam_data *cam = (cam_data *) private;
	int err = 0;

#ifdef CONFIG_MXC_IPU_V1
	ipu_free_irq(IPU_IRQ_SENSOR_EOF, NULL);
	ipu_free_irq(IPU_IRQ_SENSOR_OUT_EOF, cam);
#else
	ipu_free_irq(cam->ipu, IPU_IRQ_CSI0_OUT_EOF, cam);
#endif

	ipu_disable_csi(cam->ipu, cam->csi);
	ipu_disable_channel(cam->ipu, CSI_MEM, true);
	ipu_uninit_channel(cam->ipu, CSI_MEM);

	return err;
}

/*!
 * function to select CSI_MEM as the working path
 *
 * @param private       struct cam_data * mxc capture instance
 *
 * @return  status
 */
int prp_still_select(void *private)
{
	cam_data *cam = (cam_data *) private;

	if (cam) {
		cam->csi_start = prp_still_start;
		cam->csi_stop = prp_still_stop;
	}

	return 0;
}
EXPORT_SYMBOL(prp_still_select);

/*!
 * function to de-select CSI_MEM as the working path
 *
 * @param private       struct cam_data * mxc capture instance
 *
 * @return  status
 */
int prp_still_deselect(void *private)
{
	cam_data *cam = (cam_data *) private;
	int err = 0;

	err = prp_still_stop(cam);

	if (cam) {
		cam->csi_start = NULL;
		cam->csi_stop = NULL;
	}

	return err;
}
EXPORT_SYMBOL(prp_still_deselect);

/*!
 * Init the Encorder channels
 *
 * @return  Error code indicating success or failure
 */
__init int prp_still_init(void)
{
	return 0;
}

/*!
 * Deinit the Encorder channels
 *
 */
void __exit prp_still_exit(void)
{
}

module_init(prp_still_init);
module_exit(prp_still_exit);

MODULE_AUTHOR("Freescale Semiconductor, Inc.");
MODULE_DESCRIPTION("IPU PRP STILL IMAGE Driver");
MODULE_LICENSE("GPL");