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