mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-11 12:28:41 +08:00
659ad5f7ef
The DS4520 is a 9-bit nonvolatile (NV) I/O expander. It offers users a digitally programmable alternative to hardware jumpers and mechanical switches that are being used to control digital logic node. Signed-off-by: Okan Sahin <okan.sahin@analog.com> Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
81 lines
2.0 KiB
C
81 lines
2.0 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
/*
|
|
* Copyright (c) 2023 Analog Devices, Inc.
|
|
* Driver for the DS4520 I/O Expander
|
|
*/
|
|
|
|
#include <linux/device.h>
|
|
#include <linux/gpio/driver.h>
|
|
#include <linux/gpio/regmap.h>
|
|
#include <linux/i2c.h>
|
|
#include <linux/property.h>
|
|
#include <linux/regmap.h>
|
|
|
|
#define DS4520_PULLUP0 0xF0
|
|
#define DS4520_IO_CONTROL0 0xF2
|
|
#define DS4520_IO_STATUS0 0xF8
|
|
|
|
static const struct regmap_config ds4520_regmap_config = {
|
|
.reg_bits = 8,
|
|
.val_bits = 8,
|
|
};
|
|
|
|
static int ds4520_gpio_probe(struct i2c_client *client)
|
|
{
|
|
struct gpio_regmap_config config = { };
|
|
struct device *dev = &client->dev;
|
|
struct regmap *regmap;
|
|
u32 ngpio;
|
|
u32 base;
|
|
int ret;
|
|
|
|
ret = device_property_read_u32(dev, "reg", &base);
|
|
if (ret)
|
|
return dev_err_probe(dev, ret, "Missing 'reg' property.\n");
|
|
|
|
ret = device_property_read_u32(dev, "ngpios", &ngpio);
|
|
if (ret)
|
|
return dev_err_probe(dev, ret, "Missing 'ngpios' property.\n");
|
|
|
|
regmap = devm_regmap_init_i2c(client, &ds4520_regmap_config);
|
|
if (IS_ERR(regmap))
|
|
return dev_err_probe(dev, PTR_ERR(regmap),
|
|
"Failed to allocate register map\n");
|
|
|
|
config.regmap = regmap;
|
|
config.parent = dev;
|
|
config.ngpio = ngpio;
|
|
|
|
config.reg_dat_base = base + DS4520_IO_STATUS0;
|
|
config.reg_set_base = base + DS4520_PULLUP0;
|
|
config.reg_dir_out_base = base + DS4520_IO_CONTROL0;
|
|
|
|
return PTR_ERR_OR_ZERO(devm_gpio_regmap_register(dev, &config));
|
|
}
|
|
|
|
static const struct of_device_id ds4520_gpio_of_match_table[] = {
|
|
{ .compatible = "adi,ds4520-gpio" },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(of, ds4520_gpio_of_match_table);
|
|
|
|
static const struct i2c_device_id ds4520_gpio_id_table[] = {
|
|
{ "ds4520-gpio" },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, ds4520_gpio_id_table);
|
|
|
|
static struct i2c_driver ds4520_gpio_driver = {
|
|
.driver = {
|
|
.name = "ds4520-gpio",
|
|
.of_match_table = ds4520_gpio_of_match_table,
|
|
},
|
|
.probe = ds4520_gpio_probe,
|
|
.id_table = ds4520_gpio_id_table,
|
|
};
|
|
module_i2c_driver(ds4520_gpio_driver);
|
|
|
|
MODULE_DESCRIPTION("DS4520 I/O Expander");
|
|
MODULE_AUTHOR("Okan Sahin <okan.sahin@analog.com>");
|
|
MODULE_LICENSE("GPL");
|