/*
 * Based on drivers/video/omap/lcd_inn1510.c
 *
 * LCD panel support for the Amstrad E3 (Delta) videophone.
 *
 * Copyright (C) 2006 Jonathan McDowell <noodles@earth.li>
 *
 * 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.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */

#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/io.h>
#include <linux/delay.h>
#include <linux/lcd.h>
#include <linux/gpio.h>

#include <mach/hardware.h>
#include <mach/board-ams-delta.h>

#include "omapfb.h"

#define AMS_DELTA_DEFAULT_CONTRAST      112

#define AMS_DELTA_MAX_CONTRAST          0x00FF
#define AMS_DELTA_LCD_POWER             0x0100


/* LCD class device section */

static int ams_delta_lcd;

static int ams_delta_lcd_set_power(struct lcd_device *dev, int power)
{
        if (power == FB_BLANK_UNBLANK) {
                if (!(ams_delta_lcd & AMS_DELTA_LCD_POWER)) {
                        omap_writeb(ams_delta_lcd & AMS_DELTA_MAX_CONTRAST,
                                        OMAP_PWL_ENABLE);
                        omap_writeb(1, OMAP_PWL_CLK_ENABLE);
                        ams_delta_lcd |= AMS_DELTA_LCD_POWER;
                }
        } else {
                if (ams_delta_lcd & AMS_DELTA_LCD_POWER) {
                        omap_writeb(0, OMAP_PWL_ENABLE);
                        omap_writeb(0, OMAP_PWL_CLK_ENABLE);
                        ams_delta_lcd &= ~AMS_DELTA_LCD_POWER;
                }
        }
        return 0;
}

static int ams_delta_lcd_set_contrast(struct lcd_device *dev, int value)
{
        if ((value >= 0) && (value <= AMS_DELTA_MAX_CONTRAST)) {
                omap_writeb(value, OMAP_PWL_ENABLE);
                ams_delta_lcd &= ~AMS_DELTA_MAX_CONTRAST;
                ams_delta_lcd |= value;
        }
        return 0;
}

#ifdef CONFIG_LCD_CLASS_DEVICE
static int ams_delta_lcd_get_power(struct lcd_device *dev)
{
        if (ams_delta_lcd & AMS_DELTA_LCD_POWER)
                return FB_BLANK_UNBLANK;
        else
                return FB_BLANK_POWERDOWN;
}

static int ams_delta_lcd_get_contrast(struct lcd_device *dev)
{
        if (!(ams_delta_lcd & AMS_DELTA_LCD_POWER))
                return 0;

        return ams_delta_lcd & AMS_DELTA_MAX_CONTRAST;
}

static struct lcd_ops ams_delta_lcd_ops = {
        .get_power = ams_delta_lcd_get_power,
        .set_power = ams_delta_lcd_set_power,
        .get_contrast = ams_delta_lcd_get_contrast,
        .set_contrast = ams_delta_lcd_set_contrast,
};
#endif


/* omapfb panel section */

static const struct gpio _gpios[] = {
        {
                .gpio   = AMS_DELTA_GPIO_PIN_LCD_VBLEN,
                .flags  = GPIOF_OUT_INIT_LOW,
                .label  = "lcd_vblen",
        },
        {
                .gpio   = AMS_DELTA_GPIO_PIN_LCD_NDISP,
                .flags  = GPIOF_OUT_INIT_LOW,
                .label  = "lcd_ndisp",
        },
};

static int ams_delta_panel_init(struct lcd_panel *panel,
                struct omapfb_device *fbdev)
{
        return gpio_request_array(_gpios, ARRAY_SIZE(_gpios));
}

static void ams_delta_panel_cleanup(struct lcd_panel *panel)
{
        gpio_free_array(_gpios, ARRAY_SIZE(_gpios));
}

static int ams_delta_panel_enable(struct lcd_panel *panel)
{
        gpio_set_value(AMS_DELTA_GPIO_PIN_LCD_NDISP, 1);
        gpio_set_value(AMS_DELTA_GPIO_PIN_LCD_VBLEN, 1);
        return 0;
}

static void ams_delta_panel_disable(struct lcd_panel *panel)
{
        gpio_set_value(AMS_DELTA_GPIO_PIN_LCD_VBLEN, 0);
        gpio_set_value(AMS_DELTA_GPIO_PIN_LCD_NDISP, 0);
}

static struct lcd_panel ams_delta_panel = {
        .name           = "ams-delta",
        .config         = 0,

        .bpp            = 12,
        .data_lines     = 16,
        .x_res          = 480,
        .y_res          = 320,
        .pixel_clock    = 4687,
        .hsw            = 3,
        .hfp            = 1,
        .hbp            = 1,
        .vsw            = 1,
        .vfp            = 0,
        .vbp            = 0,
        .pcd            = 0,
        .acb            = 37,

        .init           = ams_delta_panel_init,
        .cleanup        = ams_delta_panel_cleanup,
        .enable         = ams_delta_panel_enable,
        .disable        = ams_delta_panel_disable,
};


/* platform driver section */

static int ams_delta_panel_probe(struct platform_device *pdev)
{
        struct lcd_device *lcd_device = NULL;
#ifdef CONFIG_LCD_CLASS_DEVICE
        int ret;

        lcd_device = lcd_device_register("omapfb", &pdev->dev, NULL,
                                                &ams_delta_lcd_ops);

        if (IS_ERR(lcd_device)) {
                ret = PTR_ERR(lcd_device);
                dev_err(&pdev->dev, "failed to register device\n");
                return ret;
        }

        platform_set_drvdata(pdev, lcd_device);
        lcd_device->props.max_contrast = AMS_DELTA_MAX_CONTRAST;
#endif

        ams_delta_lcd_set_contrast(lcd_device, AMS_DELTA_DEFAULT_CONTRAST);
        ams_delta_lcd_set_power(lcd_device, FB_BLANK_UNBLANK);

        omapfb_register_panel(&ams_delta_panel);
        return 0;
}

static struct platform_driver ams_delta_panel_driver = {
        .probe          = ams_delta_panel_probe,
        .driver         = {
                .name   = "lcd_ams_delta",
        },
};

module_platform_driver(ams_delta_panel_driver);