1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * BME680 - I2C Driver 4 * 5 * Copyright (C) 2018 Himanshu Jha <himanshujha199640@gmail.com> 6 * 7 * 7-Bit I2C slave address is: 8 * - 0x76 if SDO is pulled to GND 9 * - 0x77 if SDO is pulled to VDDIO 10 * 11 * Note: SDO pin cannot be left floating otherwise I2C address 12 * will be undefined. 13 */ 14 #include <linux/acpi.h> 15 #include <linux/i2c.h> 16 #include <linux/module.h> 17 #include <linux/regmap.h> 18 19 #include "bme680.h" 20 21 static int bme680_i2c_probe(struct i2c_client *client, 22 const struct i2c_device_id *id) 23 { 24 struct regmap *regmap; 25 const char *name = NULL; 26 unsigned int val; 27 int ret; 28 29 regmap = devm_regmap_init_i2c(client, &bme680_regmap_config); 30 if (IS_ERR(regmap)) { 31 dev_err(&client->dev, "Failed to register i2c regmap %d\n", 32 (int)PTR_ERR(regmap)); 33 return PTR_ERR(regmap); 34 } 35 36 ret = regmap_write(regmap, BME680_REG_SOFT_RESET_I2C, 37 BME680_CMD_SOFTRESET); 38 if (ret < 0) { 39 dev_err(&client->dev, "Failed to reset chip\n"); 40 return ret; 41 } 42 43 ret = regmap_read(regmap, BME680_REG_CHIP_I2C_ID, &val); 44 if (ret < 0) { 45 dev_err(&client->dev, "Error reading I2C chip ID\n"); 46 return ret; 47 } 48 49 if (val != BME680_CHIP_ID_VAL) { 50 dev_err(&client->dev, "Wrong chip ID, got %x expected %x\n", 51 val, BME680_CHIP_ID_VAL); 52 return -ENODEV; 53 } 54 55 if (id) 56 name = id->name; 57 58 return bme680_core_probe(&client->dev, regmap, name); 59 } 60 61 static const struct i2c_device_id bme680_i2c_id[] = { 62 {"bme680", 0}, 63 {}, 64 }; 65 MODULE_DEVICE_TABLE(i2c, bme680_i2c_id); 66 67 static const struct acpi_device_id bme680_acpi_match[] = { 68 {"BME0680", 0}, 69 {}, 70 }; 71 MODULE_DEVICE_TABLE(acpi, bme680_acpi_match); 72 73 static const struct of_device_id bme680_of_i2c_match[] = { 74 { .compatible = "bosch,bme680", }, 75 {}, 76 }; 77 MODULE_DEVICE_TABLE(of, bme680_of_i2c_match); 78 79 static struct i2c_driver bme680_i2c_driver = { 80 .driver = { 81 .name = "bme680_i2c", 82 .acpi_match_table = ACPI_PTR(bme680_acpi_match), 83 .of_match_table = bme680_of_i2c_match, 84 }, 85 .probe = bme680_i2c_probe, 86 .id_table = bme680_i2c_id, 87 }; 88 module_i2c_driver(bme680_i2c_driver); 89 90 MODULE_AUTHOR("Himanshu Jha <himanshujha199640@gmail.com>"); 91 MODULE_DESCRIPTION("BME680 I2C driver"); 92 MODULE_LICENSE("GPL v2"); 93