// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (C) 2015-2023 Texas Instruments Incorporated - https://www.ti.com/
 *      Andrew Davis <afd@ti.com>
 *
 * Based on the TPS65912 driver
 */

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

#include <linux/mfd/tps65086.h>

struct tps65086_gpio {
        struct gpio_chip chip;
        struct tps65086 *tps;
};

static int tps65086_gpio_get_direction(struct gpio_chip *chip,
                                       unsigned offset)
{
        /* This device is output only */
        return GPIO_LINE_DIRECTION_OUT;
}

static int tps65086_gpio_direction_input(struct gpio_chip *chip,
                                         unsigned offset)
{
        /* This device is output only */
        return -EINVAL;
}

static int tps65086_gpio_direction_output(struct gpio_chip *chip,
                                          unsigned offset, int value)
{
        struct tps65086_gpio *gpio = gpiochip_get_data(chip);

        /* Set the initial value */
        return regmap_update_bits(gpio->tps->regmap, TPS65086_GPOCTRL,
                                  BIT(4 + offset), value ? BIT(4 + offset) : 0);
}

static int tps65086_gpio_get(struct gpio_chip *chip, unsigned offset)
{
        struct tps65086_gpio *gpio = gpiochip_get_data(chip);
        int ret, val;

        ret = regmap_read(gpio->tps->regmap, TPS65086_GPOCTRL, &val);
        if (ret < 0)
                return ret;

        return val & BIT(4 + offset);
}

static int tps65086_gpio_set(struct gpio_chip *chip, unsigned int offset,
                             int value)
{
        struct tps65086_gpio *gpio = gpiochip_get_data(chip);

        return regmap_update_bits(gpio->tps->regmap, TPS65086_GPOCTRL,
                                  BIT(4 + offset), value ? BIT(4 + offset) : 0);
}

static const struct gpio_chip template_chip = {
        .label                  = "tps65086-gpio",
        .owner                  = THIS_MODULE,
        .get_direction          = tps65086_gpio_get_direction,
        .direction_input        = tps65086_gpio_direction_input,
        .direction_output       = tps65086_gpio_direction_output,
        .get                    = tps65086_gpio_get,
        .set                    = tps65086_gpio_set,
        .base                   = -1,
        .ngpio                  = 4,
        .can_sleep              = true,
};

static int tps65086_gpio_probe(struct platform_device *pdev)
{
        struct tps65086_gpio *gpio;

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

        gpio->tps = dev_get_drvdata(pdev->dev.parent);
        gpio->chip = template_chip;
        gpio->chip.parent = gpio->tps->dev;

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

static const struct platform_device_id tps65086_gpio_id_table[] = {
        { "tps65086-gpio", },
        { /* sentinel */ }
};
MODULE_DEVICE_TABLE(platform, tps65086_gpio_id_table);

static struct platform_driver tps65086_gpio_driver = {
        .driver = {
                .name = "tps65086-gpio",
        },
        .probe = tps65086_gpio_probe,
        .id_table = tps65086_gpio_id_table,
};
module_platform_driver(tps65086_gpio_driver);

MODULE_AUTHOR("Andrew Davis <afd@ti.com>");
MODULE_DESCRIPTION("TPS65086 GPIO driver");
MODULE_LICENSE("GPL v2");