projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 659ad5f7 OS |
1 | // SPDX-License-Identifier: GPL-2.0-or-later |
| 2 | /* | |
| 3 | * Copyright (c) 2023 Analog Devices, Inc. | |
| 4 | * Driver for the DS4520 I/O Expander | |
| 5 | */ | |
| 6 | ||
| 7 | #include <linux/device.h> | |
| 8 | #include <linux/gpio/driver.h> | |
| 9 | #include <linux/gpio/regmap.h> | |
| 10 | #include <linux/i2c.h> | |
| 11 | #include <linux/property.h> | |
| 12 | #include <linux/regmap.h> | |
| 13 | ||
| 14 | #define DS4520_PULLUP0 0xF0 | |
| 15 | #define DS4520_IO_CONTROL0 0xF2 | |
| 16 | #define DS4520_IO_STATUS0 0xF8 | |
| 17 | ||
| 18 | static const struct regmap_config ds4520_regmap_config = { | |
| 19 | .reg_bits = 8, | |
| 20 | .val_bits = 8, | |
| 21 | }; | |
| 22 | ||
| 23 | static int ds4520_gpio_probe(struct i2c_client *client) | |
| 24 | { | |
| 25 | struct gpio_regmap_config config = { }; | |
| 26 | struct device *dev = &client->dev; | |
| 27 | struct regmap *regmap; | |
| 28 | u32 ngpio; | |
| 29 | u32 base; | |
| 30 | int ret; | |
| 31 | ||
| 32 | ret = device_property_read_u32(dev, "reg", &base); | |
| 33 | if (ret) | |
| 34 | return dev_err_probe(dev, ret, "Missing 'reg' property.\n"); | |
| 35 | ||
| 36 | ret = device_property_read_u32(dev, "ngpios", &ngpio); | |
| 37 | if (ret) | |
| 38 | return dev_err_probe(dev, ret, "Missing 'ngpios' property.\n"); | |
| 39 | ||
| 40 | regmap = devm_regmap_init_i2c(client, &ds4520_regmap_config); | |
| 41 | if (IS_ERR(regmap)) | |
| 42 | return dev_err_probe(dev, PTR_ERR(regmap), | |
| 43 | "Failed to allocate register map\n"); | |
| 44 | ||
| 45 | config.regmap = regmap; | |
| 46 | config.parent = dev; | |
| 47 | config.ngpio = ngpio; | |
| 48 | ||
| 49 | config.reg_dat_base = base + DS4520_IO_STATUS0; | |
| 50 | config.reg_set_base = base + DS4520_PULLUP0; | |
| 51 | config.reg_dir_out_base = base + DS4520_IO_CONTROL0; | |
| 52 | ||
| 53 | return PTR_ERR_OR_ZERO(devm_gpio_regmap_register(dev, &config)); | |
| 54 | } | |
| 55 | ||
| 56 | static const struct of_device_id ds4520_gpio_of_match_table[] = { | |
| 57 | { .compatible = "adi,ds4520-gpio" }, | |
| 58 | { } | |
| 59 | }; | |
| 60 | MODULE_DEVICE_TABLE(of, ds4520_gpio_of_match_table); | |
| 61 | ||
| 62 | static const struct i2c_device_id ds4520_gpio_id_table[] = { | |
| 63 | { "ds4520-gpio" }, | |
| 64 | { } | |
| 65 | }; | |
| 66 | MODULE_DEVICE_TABLE(i2c, ds4520_gpio_id_table); | |
| 67 | ||
| 68 | static struct i2c_driver ds4520_gpio_driver = { | |
| 69 | .driver = { | |
| 70 | .name = "ds4520-gpio", | |
| 71 | .of_match_table = ds4520_gpio_of_match_table, | |
| 72 | }, | |
| 73 | .probe = ds4520_gpio_probe, | |
| 74 | .id_table = ds4520_gpio_id_table, | |
| 75 | }; | |
| 76 | module_i2c_driver(ds4520_gpio_driver); | |
| 77 | ||
| 78 | MODULE_DESCRIPTION("DS4520 I/O Expander"); | |
| 79 | MODULE_AUTHOR("Okan Sahin <[email protected]>"); | |
| 80 | MODULE_LICENSE("GPL"); |