// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *  CLPS711X GPIO driver
 *
 *  Copyright (C) 2012,2013 Alexander Shiyan <shc_work@mail.ru>
 */

#include <linux/err.h>
#include <linux/module.h>
#include <linux/gpio/driver.h>
#include <linux/gpio/generic.h>
#include <linux/platform_device.h>

static int clps711x_gpio_probe(struct platform_device *pdev)
{
        struct gpio_generic_chip_config config = { };
        struct device_node *np = pdev->dev.of_node;
        struct gpio_generic_chip *gen_gc;
        void __iomem *dat, *dir;
        int err, id;

        if (!np)
                return -ENODEV;

        id = of_alias_get_id(np, "gpio");
        if ((id < 0) || (id > 4))
                return -ENODEV;

        gen_gc = devm_kzalloc(&pdev->dev, sizeof(*gen_gc), GFP_KERNEL);
        if (!gen_gc)
                return -ENOMEM;

        dat = devm_platform_ioremap_resource(pdev, 0);
        if (IS_ERR(dat))
                return PTR_ERR(dat);

        dir = devm_platform_ioremap_resource(pdev, 1);
        if (IS_ERR(dir))
                return PTR_ERR(dir);

        config.dev = &pdev->dev;
        config.sz = 1;
        config.dat = dat;

        switch (id) {
        case 3:
                /* PORTD is inverted logic for direction register */
                config.dirin = dir;
                break;
        default:
                config.dirout = dir;
                break;
        }

        err = gpio_generic_chip_init(gen_gc, &config);
        if (err)
                return err;

        switch (id) {
        case 4:
                /* PORTE is 3 lines only */
                gen_gc->gc.ngpio = 3;
                break;
        default:
                break;
        }

        gen_gc->gc.base = -1;
        gen_gc->gc.owner = THIS_MODULE;

        return devm_gpiochip_add_data(&pdev->dev, &gen_gc->gc, NULL);
}

static const struct of_device_id clps711x_gpio_ids[] = {
        { .compatible = "cirrus,ep7209-gpio" },
        { }
};
MODULE_DEVICE_TABLE(of, clps711x_gpio_ids);

static struct platform_driver clps711x_gpio_driver = {
        .driver = {
                .name           = "clps711x-gpio",
                .of_match_table = clps711x_gpio_ids,
        },
        .probe  = clps711x_gpio_probe,
};
module_platform_driver(clps711x_gpio_driver);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>");
MODULE_DESCRIPTION("CLPS711X GPIO driver");
MODULE_ALIAS("platform:clps711x-gpio");