// SPDX-License-Identifier: GPL-2.0-only
/*
 * ROHM BD9571MWV-M and BD9574MWF-M GPIO driver
 *
 * Copyright (C) 2017 Marek Vasut <marek.vasut+renesas@gmail.com>
 *
 * Based on the TPS65086 driver
 *
 * NOTE: Interrupts are not supported yet.
 */

#include <linux/gpio/driver.h>
#include <linux/mfd/rohm-generic.h>
#include <linux/module.h>
#include <linux/platform_device.h>

#include <linux/mfd/bd9571mwv.h>

struct bd9571mwv_gpio {
        struct regmap *regmap;
        struct gpio_chip chip;
};

static int bd9571mwv_gpio_get_direction(struct gpio_chip *chip,
                                       unsigned int offset)
{
        struct bd9571mwv_gpio *gpio = gpiochip_get_data(chip);
        int ret, val;

        ret = regmap_read(gpio->regmap, BD9571MWV_GPIO_DIR, &val);
        if (ret < 0)
                return ret;
        if (val & BIT(offset))
                return GPIO_LINE_DIRECTION_IN;

        return GPIO_LINE_DIRECTION_OUT;
}

static int bd9571mwv_gpio_direction_input(struct gpio_chip *chip,
                                         unsigned int offset)
{
        struct bd9571mwv_gpio *gpio = gpiochip_get_data(chip);

        regmap_update_bits(gpio->regmap, BD9571MWV_GPIO_DIR, BIT(offset), 0);

        return 0;
}

static int bd9571mwv_gpio_direction_output(struct gpio_chip *chip,
                                          unsigned int offset, int value)
{
        struct bd9571mwv_gpio *gpio = gpiochip_get_data(chip);

        /* Set the initial value */
        regmap_update_bits(gpio->regmap, BD9571MWV_GPIO_OUT,
                           BIT(offset), value ? BIT(offset) : 0);
        regmap_update_bits(gpio->regmap, BD9571MWV_GPIO_DIR,
                           BIT(offset), BIT(offset));

        return 0;
}

static int bd9571mwv_gpio_get(struct gpio_chip *chip, unsigned int offset)
{
        struct bd9571mwv_gpio *gpio = gpiochip_get_data(chip);
        int ret, val;

        ret = regmap_read(gpio->regmap, BD9571MWV_GPIO_IN, &val);
        if (ret < 0)
                return ret;

        return val & BIT(offset);
}

static int bd9571mwv_gpio_set(struct gpio_chip *chip, unsigned int offset,
                              int value)
{
        struct bd9571mwv_gpio *gpio = gpiochip_get_data(chip);

        return regmap_update_bits(gpio->regmap, BD9571MWV_GPIO_OUT,
                                  BIT(offset), value ? BIT(offset) : 0);
}

static const struct gpio_chip template_chip = {
        .label                  = "bd9571mwv-gpio",
        .owner                  = THIS_MODULE,
        .get_direction          = bd9571mwv_gpio_get_direction,
        .direction_input        = bd9571mwv_gpio_direction_input,
        .direction_output       = bd9571mwv_gpio_direction_output,
        .get                    = bd9571mwv_gpio_get,
        .set                    = bd9571mwv_gpio_set,
        .base                   = -1,
        .ngpio                  = 2,
        .can_sleep              = true,
};

static int bd9571mwv_gpio_probe(struct platform_device *pdev)
{
        struct bd9571mwv_gpio *gpio;

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

        gpio->regmap = dev_get_regmap(pdev->dev.parent, NULL);
        gpio->chip = template_chip;
        gpio->chip.parent = pdev->dev.parent;

        return devm_gpiochip_add_data(&pdev->dev, &gpio->chip, gpio);
}

static const struct platform_device_id bd9571mwv_gpio_id_table[] = {
        { "bd9571mwv-gpio", ROHM_CHIP_TYPE_BD9571 },
        { "bd9574mwf-gpio", ROHM_CHIP_TYPE_BD9574 },
        { /* sentinel */ }
};
MODULE_DEVICE_TABLE(platform, bd9571mwv_gpio_id_table);

static struct platform_driver bd9571mwv_gpio_driver = {
        .driver = {
                .name = "bd9571mwv-gpio",
        },
        .probe = bd9571mwv_gpio_probe,
        .id_table = bd9571mwv_gpio_id_table,
};
module_platform_driver(bd9571mwv_gpio_driver);

MODULE_AUTHOR("Marek Vasut <marek.vasut+renesas@gmail.com>");
MODULE_DESCRIPTION("BD9571MWV GPIO driver");
MODULE_LICENSE("GPL v2");