/*
 * Copyright 2007-2011 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
 */

/*!
 * @defgroup Framebuffer Framebuffer Driver for SDC and ADC.
 */

/*!
 * @file mxcfb_epson_vga.c
 *
 * @brief MXC Frame buffer driver for SDC
 *
 * @ingroup Framebuffer
 */

/*!
 * Include files
 */
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/console.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/fb.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/regulator/consumer.h>
#include <linux/spi/spi.h>
#include <linux/mxcfb.h>
#include <linux/ipu.h>
#include <linux/fsl_devices.h>
#include <asm/mach-types.h>
#include <mach/hardware.h>

static struct spi_device *lcd_spi;
static struct device *lcd_dev;

static void lcd_init(void);
static void lcd_poweron(void);
static void lcd_poweroff(void);

static void (*lcd_reset) (void);
static struct regulator *io_reg;
static struct regulator *core_reg;

static struct fb_videomode video_modes[] = {
	{
	 /* 480x640 @ 60 Hz */
	 "Epson-VGA", 60, 480, 640, 41701, 60, 41, 10, 5, 20, 10,
	 0,
	 FB_VMODE_NONINTERLACED,
	 0,},
};

static void lcd_init_fb(struct fb_info *info)
{
	struct fb_var_screeninfo var;

	memset(&var, 0, sizeof(var));

	fb_videomode_to_var(&var, &video_modes[0]);

	if (machine_is_mx31_3ds()) {
		var.upper_margin = 0;
		var.left_margin = 0;
	}

	var.activate = FB_ACTIVATE_ALL;
	var.yres_virtual = var.yres * 3;

	console_lock();
	info->flags |= FBINFO_MISC_USEREVENT;
	fb_set_var(info, &var);
	info->flags &= ~FBINFO_MISC_USEREVENT;
	console_unlock();
}

static int lcd_fb_event(struct notifier_block *nb, unsigned long val, void *v)
{
	struct fb_event *event = v;

	if (strcmp(event->info->fix.id, "DISP3 BG")) {
		return 0;
	}

	switch (val) {
	case FB_EVENT_FB_REGISTERED:
		lcd_init_fb(event->info);
		lcd_poweron();
		break;
	case FB_EVENT_BLANK:
		if ((event->info->var.xres != 480) ||
		    (event->info->var.yres != 640)) {
			break;
		}
		if (*((int *)event->data) == FB_BLANK_UNBLANK) {
			lcd_poweron();
		} else {
			lcd_poweroff();
		}
		break;
	}
	return 0;
}

static struct notifier_block nb = {
	.notifier_call = lcd_fb_event,
};

/*!
 * This function is called whenever the SPI slave device is detected.
 *
 * @param	spi	the SPI slave device
 *
 * @return 	Returns 0 on SUCCESS and error on FAILURE.
 */
static int __devinit lcd_probe(struct device *dev)
{
	int i;
	struct mxc_lcd_platform_data *plat = dev->platform_data;

	lcd_dev = dev;

	if (plat) {
		io_reg = regulator_get(dev, plat->io_reg);
		if (!IS_ERR(io_reg)) {
			regulator_set_voltage(io_reg, 1800000, 1800000);
			regulator_enable(io_reg);
		}
		core_reg = regulator_get(dev, plat->core_reg);
		if (!IS_ERR(core_reg)) {
			regulator_set_voltage(core_reg, 2800000, 2800000);
			regulator_enable(core_reg);
		}

		lcd_reset = plat->reset;
		if (lcd_reset)
			lcd_reset();
	}

	lcd_init();

	for (i = 0; i < num_registered_fb; i++) {
		if (strcmp(registered_fb[i]->fix.id, "DISP3 BG") == 0) {
			lcd_init_fb(registered_fb[i]);
			fb_show_logo(registered_fb[i], 0);
			lcd_poweron();
		}
	}

	fb_register_client(&nb);

	return 0;
}

static int __devinit lcd_plat_probe(struct platform_device *pdev)
{
	ipu_adc_sig_cfg_t sig;
	ipu_channel_params_t param;

	memset(&sig, 0, sizeof(sig));
	sig.ifc_width = 9;
	sig.clk_pol = 1;
	ipu_init_async_panel(0, IPU_PANEL_SERIAL, 90, IPU_PIX_FMT_GENERIC, sig);

	memset(&param, 0, sizeof(param));
	ipu_init_channel(DIRECT_ASYNC1, &param);

	return lcd_probe(&pdev->dev);
}

static int __devinit lcd_spi_probe(struct spi_device *spi)
{
	lcd_spi = spi;

	spi->bits_per_word = 9;
	spi_setup(spi);

	return lcd_probe(&spi->dev);
}

static int __devexit lcd_remove(struct device *dev)
{
	fb_unregister_client(&nb);
	lcd_poweroff();
	regulator_put(io_reg);
	regulator_put(core_reg);

	return 0;
}

static int __devexit lcd_spi_remove(struct spi_device *spi)
{
	int ret = lcd_remove(&spi->dev);
	lcd_spi = NULL;
	return ret;
}

static int __devexit lcd_plat_remove(struct platform_device *pdev)
{
	return lcd_remove(&pdev->dev);
}

static int lcd_suspend(struct spi_device *spi, pm_message_t message)
{
	lcd_poweroff();
	return 0;
}

static int lcd_resume(struct spi_device *spi)
{
	if (lcd_reset)
		lcd_reset();

	lcd_init();
	lcd_poweron();
	return 0;
}

/*!
 * spi driver structure for LTV350QV
 */
static struct spi_driver lcd_spi_dev_driver = {

	.driver = {
		   .name = "lcd_spi",
		   .owner = THIS_MODULE,
		   },
	.probe = lcd_spi_probe,
	.remove = __devexit_p(lcd_spi_remove),
	.suspend = lcd_suspend,
	.resume = lcd_resume,
};

static struct platform_driver lcd_plat_driver = {
	.driver = {
		   .name = "lcd_spi",
		   .owner = THIS_MODULE,
		   },
	.probe = lcd_plat_probe,
	.remove = __devexit_p(lcd_plat_remove),
};

#define param(x) ((x) | 0x100)

/*
 * Send init commands to L4F00242T03
 *
 */
static void lcd_init(void)
{
	const u16 cmd[] = { 0x36, param(0), 0x3A, param(0x60) };

	dev_dbg(lcd_dev, "initializing LCD\n");
	if (lcd_spi) {
		spi_write(lcd_spi, (const u8 *)cmd, ARRAY_SIZE(cmd));
	} else {
		ipu_disp_direct_write(DIRECT_ASYNC1, 0x36, 0);
		ipu_disp_direct_write(DIRECT_ASYNC1, 0x100, 0);
		ipu_disp_direct_write(DIRECT_ASYNC1, 0x3A, 0);
		ipu_disp_direct_write(DIRECT_ASYNC1, 0x160, 0);
		msleep(1);
		ipu_uninit_channel(DIRECT_ASYNC1);
	}
}

static int lcd_on;
/*
 * Send Power On commands to L4F00242T03
 *
 */
static void lcd_poweron(void)
{
	const u16 slpout = 0x11;
	const u16 dison = 0x29;
	ipu_channel_params_t param;
	if (lcd_on)
		return;

	dev_dbg(lcd_dev, "turning on LCD\n");

	if (lcd_spi) {
		msleep(60);
		spi_write(lcd_spi, (const u8 *)&slpout, 1);
		msleep(60);
		spi_write(lcd_spi, (const u8 *)&dison, 1);
	} else {
		memset(&param, 0, sizeof(param));
		ipu_init_channel(DIRECT_ASYNC1, &param);
		ipu_disp_direct_write(DIRECT_ASYNC1, slpout, 0);
		msleep(60);
		ipu_disp_direct_write(DIRECT_ASYNC1, dison, 0);
		msleep(1);
		ipu_uninit_channel(DIRECT_ASYNC1);
	}
	lcd_on = 1;
}

/*
 * Send Power Off commands to L4F00242T03
 *
 */
static void lcd_poweroff(void)
{
	const u16 slpin = 0x10;
	const u16 disoff = 0x28;
	ipu_channel_params_t param;
	if (!lcd_on)
		return;

	dev_dbg(lcd_dev, "turning off LCD\n");

	if (lcd_spi) {
		msleep(60);
		spi_write(lcd_spi, (const u8 *)&disoff, 1);
		msleep(60);
		spi_write(lcd_spi, (const u8 *)&slpin, 1);
	} else {
		memset(&param, 0, sizeof(param));
		ipu_init_channel(DIRECT_ASYNC1, &param);
		ipu_disp_direct_write(DIRECT_ASYNC1, disoff, 0);
		msleep(60);
		ipu_disp_direct_write(DIRECT_ASYNC1, slpin, 0);
		msleep(1);
		ipu_uninit_channel(DIRECT_ASYNC1);
	}
	lcd_on = 0;
}

static int __init epson_lcd_init(void)
{
	int ret;

	ret = platform_driver_register(&lcd_plat_driver);
	if (ret)
		return ret;

	return spi_register_driver(&lcd_spi_dev_driver);

}

static void __exit epson_lcd_exit(void)
{
	spi_unregister_driver(&lcd_spi_dev_driver);
}

module_init(epson_lcd_init);
module_exit(epson_lcd_exit);

MODULE_AUTHOR("Freescale Semiconductor, Inc.");
MODULE_DESCRIPTION("Epson VGA LCD init driver");
MODULE_LICENSE("GPL");