// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * 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>
 */

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

#include <linux/soc/ti/omap1-io.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 struct gpio_desc *gpiod_vblen;
static struct gpio_desc *gpiod_ndisp;

static int ams_delta_lcd_set_power(struct lcd_device *dev, int power)
{
        if (power == LCD_POWER_ON) {
                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 LCD_POWER_ON;
        else
                return LCD_POWER_OFF;
}

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 const 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 int ams_delta_panel_enable(struct lcd_panel *panel)
{
        gpiod_set_value(gpiod_ndisp, 1);
        gpiod_set_value(gpiod_vblen, 1);
        return 0;
}

static void ams_delta_panel_disable(struct lcd_panel *panel)
{
        gpiod_set_value(gpiod_vblen, 0);
        gpiod_set_value(gpiod_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,

        .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;

        gpiod_vblen = devm_gpiod_get(&pdev->dev, "vblen", GPIOD_OUT_LOW);
        if (IS_ERR(gpiod_vblen))
                return dev_err_probe(&pdev->dev, PTR_ERR(gpiod_vblen),
                                     "VBLEN GPIO request failed\n");

        gpiod_ndisp = devm_gpiod_get(&pdev->dev, "ndisp", GPIOD_OUT_LOW);
        if (IS_ERR(gpiod_ndisp))
                return dev_err_probe(&pdev->dev, PTR_ERR(gpiod_ndisp),
                                     "NDISP GPIO request failed\n");

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

        if (IS_ERR(lcd_device)) {
                int 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, LCD_POWER_ON);

        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);

MODULE_AUTHOR("Jonathan McDowell <noodles@earth.li>");
MODULE_DESCRIPTION("LCD panel support for the Amstrad E3 (Delta) videophone");
MODULE_LICENSE("GPL");