diff options
Diffstat (limited to 'drivers/gpio/gpio-ds4520.c')
-rw-r--r-- | drivers/gpio/gpio-ds4520.c | 80 |
1 files changed, 80 insertions, 0 deletions
diff --git a/drivers/gpio/gpio-ds4520.c b/drivers/gpio/gpio-ds4520.c new file mode 100644 index 000000000000..1903deaef3e9 --- /dev/null +++ b/drivers/gpio/gpio-ds4520.c @@ -0,0 +1,80 @@ +// 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"); |