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// 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/mod_devicetable.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");
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