// SPDX-License-Identifier: GPL-2.0
//
// Copyright (C) 2026 Linaro Inc.
//   Author: AKASHI takahiro <takahiro.akashi@linaro.org>

#include <linux/errno.h>
#include <linux/gpio/driver.h>
#include <linux/module.h>
#include <linux/pinctrl/consumer.h>
#include <linux/platform_device.h>
#include <linux/types.h>

#include "gpiolib.h"

static int pin_control_gpio_get_direction(struct gpio_chip *gc, unsigned int offset)
{
        unsigned long config;
        int ret;

        config = PIN_CONFIG_OUTPUT_ENABLE;
        ret = pinctrl_gpio_get_config(gc, offset, &config);
        if (ret)
                return ret;
        if (config)
                return GPIO_LINE_DIRECTION_OUT;

        return GPIO_LINE_DIRECTION_IN;
}

static int pin_control_gpio_direction_output(struct gpio_chip *chip,
                                             unsigned int offset, int val)
{
        return pinctrl_gpio_direction_output(chip, offset);
}

static int pin_control_gpio_get(struct gpio_chip *chip, unsigned int offset)
{
        unsigned long config;
        int ret;

        config = PIN_CONFIG_LEVEL;
        ret = pinctrl_gpio_get_config(chip, offset, &config);
        if (ret)
                return ret;

        return !!config;
}

static int pin_control_gpio_set(struct gpio_chip *chip, unsigned int offset,
                                int val)
{
        unsigned long config;

        config = pinconf_to_config_packed(PIN_CONFIG_LEVEL, val);
        return pinctrl_gpio_set_config(chip, offset, config);
}

static int pin_control_gpio_probe(struct platform_device *pdev)
{
        struct device *dev = &pdev->dev;
        struct gpio_chip *chip;

        chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL);
        if (!chip)
                return -ENOMEM;

        chip->label = dev_name(dev);
        chip->parent = dev;
        chip->base = -1;

        chip->request = gpiochip_generic_request;
        chip->free = gpiochip_generic_free;
        chip->get_direction = pin_control_gpio_get_direction;
        chip->direction_input = pinctrl_gpio_direction_input;
        chip->direction_output = pin_control_gpio_direction_output;
        chip->get = pin_control_gpio_get;
        chip->set = pin_control_gpio_set;
        chip->set_config = gpiochip_generic_config;

        return devm_gpiochip_add_data(dev, chip, NULL);
}

static const struct of_device_id pin_control_gpio_match[] = {
        { .compatible = "scmi-pinctrl-gpio" },
        { /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, pin_control_gpio_match);

static struct platform_driver pin_control_gpio_driver = {
        .probe = pin_control_gpio_probe,
        .driver = {
                .name = "pin-control-gpio",
                .of_match_table = pin_control_gpio_match,
        },
};
module_platform_driver(pin_control_gpio_driver);

MODULE_AUTHOR("AKASHI Takahiro <takahiro.akashi@linaro.org>");
MODULE_DESCRIPTION("Pinctrl based GPIO driver");
MODULE_LICENSE("GPL");