81 lines
2.0 KiB
C
81 lines
2.0 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (c) 2023 Analog Devices, Inc.
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* Driver for the DS4520 I/O Expander
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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/i2c.h>
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#include <linux/property.h>
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#include <linux/regmap.h>
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#define DS4520_PULLUP0 0xF0
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#define DS4520_IO_CONTROL0 0xF2
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#define DS4520_IO_STATUS0 0xF8
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static const struct regmap_config ds4520_regmap_config = {
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.reg_bits = 8,
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.val_bits = 8,
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};
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static int ds4520_gpio_probe(struct i2c_client *client)
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{
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struct gpio_regmap_config config = { };
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struct device *dev = &client->dev;
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struct regmap *regmap;
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u32 ngpio;
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u32 base;
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int ret;
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ret = device_property_read_u32(dev, "reg", &base);
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if (ret)
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return dev_err_probe(dev, ret, "Missing 'reg' property.\n");
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ret = device_property_read_u32(dev, "ngpios", &ngpio);
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if (ret)
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return dev_err_probe(dev, ret, "Missing 'ngpios' property.\n");
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regmap = devm_regmap_init_i2c(client, &ds4520_regmap_config);
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if (IS_ERR(regmap))
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return dev_err_probe(dev, PTR_ERR(regmap),
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"Failed to allocate register map\n");
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config.regmap = regmap;
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config.parent = dev;
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config.ngpio = ngpio;
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config.reg_dat_base = base + DS4520_IO_STATUS0;
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config.reg_set_base = base + DS4520_PULLUP0;
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config.reg_dir_out_base = base + DS4520_IO_CONTROL0;
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return PTR_ERR_OR_ZERO(devm_gpio_regmap_register(dev, &config));
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}
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static const struct of_device_id ds4520_gpio_of_match_table[] = {
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{ .compatible = "adi,ds4520-gpio" },
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{ }
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};
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MODULE_DEVICE_TABLE(of, ds4520_gpio_of_match_table);
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static const struct i2c_device_id ds4520_gpio_id_table[] = {
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{ "ds4520-gpio" },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, ds4520_gpio_id_table);
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static struct i2c_driver ds4520_gpio_driver = {
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.driver = {
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.name = "ds4520-gpio",
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.of_match_table = ds4520_gpio_of_match_table,
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},
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.probe = ds4520_gpio_probe,
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.id_table = ds4520_gpio_id_table,
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};
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module_i2c_driver(ds4520_gpio_driver);
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MODULE_DESCRIPTION("DS4520 I/O Expander");
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MODULE_AUTHOR("Okan Sahin <okan.sahin@analog.com>");
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MODULE_LICENSE("GPL");
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