// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *
 * LCD driver for HP Jornada 700 series (710/720/728)
 * Copyright (C) 2006-2009 Kristoffer Ericson <kristoffer.ericson@gmail.com>
 */

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

#include <mach/jornada720.h>
#include <mach/hardware.h>

#include <video/s1d13xxxfb.h>

#define LCD_MAX_CONTRAST        0xff
#define LCD_DEF_CONTRAST        0x80

static int jornada_lcd_get_power(struct lcd_device *ld)
{
        return PPSR & PPC_LDD2 ? LCD_POWER_ON : LCD_POWER_OFF;
}

static int jornada_lcd_get_contrast(struct lcd_device *ld)
{
        int ret;

        if (jornada_lcd_get_power(ld) != LCD_POWER_ON)
                return 0;

        jornada_ssp_start();

        if (jornada_ssp_byte(GETCONTRAST) == TXDUMMY) {
                ret = jornada_ssp_byte(TXDUMMY);
                goto success;
        }

        dev_err(&ld->dev, "failed to set contrast\n");
        ret = -ETIMEDOUT;

success:
        jornada_ssp_end();
        return ret;
}

static int jornada_lcd_set_contrast(struct lcd_device *ld, int value)
{
        int ret = 0;

        jornada_ssp_start();

        /* start by sending our set contrast cmd to mcu */
        if (jornada_ssp_byte(SETCONTRAST) == TXDUMMY) {
                /* if successful push the new value */
                if (jornada_ssp_byte(value) == TXDUMMY)
                        goto success;
        }

        dev_err(&ld->dev, "failed to set contrast\n");
        ret = -ETIMEDOUT;

success:
        jornada_ssp_end();
        return ret;
}

static int jornada_lcd_set_power(struct lcd_device *ld, int power)
{
        if (power != LCD_POWER_ON) {
                PPSR &= ~PPC_LDD2;
                PPDR |= PPC_LDD2;
        } else {
                PPSR |= PPC_LDD2;
        }

        return 0;
}

static const struct lcd_ops jornada_lcd_props = {
        .get_contrast = jornada_lcd_get_contrast,
        .set_contrast = jornada_lcd_set_contrast,
        .get_power = jornada_lcd_get_power,
        .set_power = jornada_lcd_set_power,
};

static int jornada_lcd_probe(struct platform_device *pdev)
{
        struct lcd_device *lcd_device;
        int ret;

        lcd_device = devm_lcd_device_register(&pdev->dev, S1D_DEVICENAME,
                                        &pdev->dev, NULL, &jornada_lcd_props);

        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);

        /* lets set our default values */
        jornada_lcd_set_contrast(lcd_device, LCD_DEF_CONTRAST);
        jornada_lcd_set_power(lcd_device, LCD_POWER_ON);
        /* give it some time to startup */
        msleep(100);

        return 0;
}

static struct platform_driver jornada_lcd_driver = {
        .probe  = jornada_lcd_probe,
        .driver = {
                .name   = "jornada_lcd",
        },
};

module_platform_driver(jornada_lcd_driver);

MODULE_AUTHOR("Kristoffer Ericson <kristoffer.ericson@gmail.com>");
MODULE_DESCRIPTION("HP Jornada 710/720/728 LCD driver");
MODULE_LICENSE("GPL");