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- // SPDX-License-Identifier: GPL-2.0-only
- /*
- * Delta TN48M CPLD GPIO driver
- *
- * Copyright (C) 2021 Sartura Ltd.
- *
- * Author: Robert Marko <[email protected]>
- */
- #include <linux/device.h>
- #include <linux/gpio/driver.h>
- #include <linux/gpio/regmap.h>
- #include <linux/mod_devicetable.h>
- #include <linux/module.h>
- #include <linux/platform_device.h>
- #include <linux/regmap.h>
- enum tn48m_gpio_type {
- TN48M_GP0 = 1,
- TN48M_GPI,
- };
- struct tn48m_gpio_config {
- int ngpio;
- int ngpio_per_reg;
- enum tn48m_gpio_type type;
- };
- static const struct tn48m_gpio_config tn48m_gpo_config = {
- .ngpio = 4,
- .ngpio_per_reg = 4,
- .type = TN48M_GP0,
- };
- static const struct tn48m_gpio_config tn48m_gpi_config = {
- .ngpio = 4,
- .ngpio_per_reg = 4,
- .type = TN48M_GPI,
- };
- static int tn48m_gpio_probe(struct platform_device *pdev)
- {
- const struct tn48m_gpio_config *gpio_config;
- struct gpio_regmap_config config = {};
- struct regmap *regmap;
- u32 base;
- int ret;
- if (!pdev->dev.parent)
- return -ENODEV;
- gpio_config = device_get_match_data(&pdev->dev);
- if (!gpio_config)
- return -ENODEV;
- ret = device_property_read_u32(&pdev->dev, "reg", &base);
- if (ret)
- return ret;
- regmap = dev_get_regmap(pdev->dev.parent, NULL);
- if (!regmap)
- return -ENODEV;
- config.regmap = regmap;
- config.parent = &pdev->dev;
- config.ngpio = gpio_config->ngpio;
- config.ngpio_per_reg = gpio_config->ngpio_per_reg;
- switch (gpio_config->type) {
- case TN48M_GP0:
- config.reg_set_base = base;
- break;
- case TN48M_GPI:
- config.reg_dat_base = base;
- break;
- default:
- return -EINVAL;
- }
- return PTR_ERR_OR_ZERO(devm_gpio_regmap_register(&pdev->dev, &config));
- }
- static const struct of_device_id tn48m_gpio_of_match[] = {
- { .compatible = "delta,tn48m-gpo", .data = &tn48m_gpo_config },
- { .compatible = "delta,tn48m-gpi", .data = &tn48m_gpi_config },
- { }
- };
- MODULE_DEVICE_TABLE(of, tn48m_gpio_of_match);
- static struct platform_driver tn48m_gpio_driver = {
- .driver = {
- .name = "delta-tn48m-gpio",
- .of_match_table = tn48m_gpio_of_match,
- },
- .probe = tn48m_gpio_probe,
- };
- module_platform_driver(tn48m_gpio_driver);
- MODULE_AUTHOR("Robert Marko <[email protected]>");
- MODULE_DESCRIPTION("Delta TN48M CPLD GPIO driver");
- MODULE_LICENSE("GPL");
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