107 lines
2.6 KiB
C
107 lines
2.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
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//
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// Copyright (C) 2026 Linaro Inc.
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// Author: AKASHI takahiro <takahiro.akashi@linaro.org>
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#include <linux/errno.h>
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#include <linux/gpio/driver.h>
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#include <linux/module.h>
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#include <linux/pinctrl/consumer.h>
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#include <linux/platform_device.h>
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#include <linux/types.h>
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#include "gpiolib.h"
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static int pin_control_gpio_get_direction(struct gpio_chip *gc, unsigned int offset)
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{
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unsigned long config;
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int ret;
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config = PIN_CONFIG_OUTPUT_ENABLE;
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ret = pinctrl_gpio_get_config(gc, offset, &config);
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if (ret)
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return ret;
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if (config)
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return GPIO_LINE_DIRECTION_OUT;
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return GPIO_LINE_DIRECTION_IN;
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}
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static int pin_control_gpio_get(struct gpio_chip *chip, unsigned int offset)
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{
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unsigned long config;
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int ret;
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config = PIN_CONFIG_LEVEL;
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ret = pinctrl_gpio_get_config(chip, offset, &config);
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if (ret)
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return ret;
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return !!config;
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}
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static int pin_control_gpio_set(struct gpio_chip *chip, unsigned int offset,
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int val)
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{
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unsigned long config;
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config = pinconf_to_config_packed(PIN_CONFIG_LEVEL, val);
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return pinctrl_gpio_set_config(chip, offset, config);
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}
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static int pin_control_gpio_direction_output(struct gpio_chip *chip,
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unsigned int offset, int val)
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{
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int ret;
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ret = pinctrl_gpio_direction_output(chip, offset);
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if (ret)
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return ret;
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return pin_control_gpio_set(chip, offset, val);
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}
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static int pin_control_gpio_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct gpio_chip *chip;
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chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL);
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if (!chip)
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return -ENOMEM;
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chip->label = dev_name(dev);
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chip->parent = dev;
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chip->base = -1;
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chip->request = gpiochip_generic_request;
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chip->free = gpiochip_generic_free;
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chip->get_direction = pin_control_gpio_get_direction;
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chip->direction_input = pinctrl_gpio_direction_input;
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chip->direction_output = pin_control_gpio_direction_output;
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chip->get = pin_control_gpio_get;
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chip->set = pin_control_gpio_set;
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chip->set_config = gpiochip_generic_config;
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return devm_gpiochip_add_data(dev, chip, NULL);
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}
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static const struct of_device_id pin_control_gpio_match[] = {
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{ .compatible = "scmi-pinctrl-gpio" },
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(of, pin_control_gpio_match);
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static struct platform_driver pin_control_gpio_driver = {
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.probe = pin_control_gpio_probe,
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.driver = {
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.name = "pin-control-gpio",
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.of_match_table = pin_control_gpio_match,
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},
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};
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module_platform_driver(pin_control_gpio_driver);
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MODULE_AUTHOR("AKASHI Takahiro <takahiro.akashi@linaro.org>");
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MODULE_DESCRIPTION("Pinctrl based GPIO driver");
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MODULE_LICENSE("GPL");
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