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// SPDX-License-Identifier: GPL-2.0
/*
* BME680 - I2C Driver
*
* Copyright (C) 2018 Himanshu Jha <himanshujha199640@gmail.com>
*
* 7-Bit I2C slave address is:
* - 0x76 if SDO is pulled to GND
* - 0x77 if SDO is pulled to VDDIO
*
* Note: SDO pin cannot be left floating otherwise I2C address
* will be undefined.
*/
#include <linux/acpi.h>
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/regmap.h>
#include "bme680.h"
static int bme680_i2c_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct regmap *regmap;
const char *name = NULL;
unsigned int val;
int ret;
regmap = devm_regmap_init_i2c(client, &bme680_regmap_config);
if (IS_ERR(regmap)) {
dev_err(&client->dev, "Failed to register i2c regmap %d\n",
(int)PTR_ERR(regmap));
return PTR_ERR(regmap);
}
ret = regmap_write(regmap, BME680_REG_SOFT_RESET_I2C,
BME680_CMD_SOFTRESET);
if (ret < 0) {
dev_err(&client->dev, "Failed to reset chip\n");
return ret;
}
ret = regmap_read(regmap, BME680_REG_CHIP_I2C_ID, &val);
if (ret < 0) {
dev_err(&client->dev, "Error reading I2C chip ID\n");
return ret;
}
if (val != BME680_CHIP_ID_VAL) {
dev_err(&client->dev, "Wrong chip ID, got %x expected %x\n",
val, BME680_CHIP_ID_VAL);
return -ENODEV;
}
if (id)
name = id->name;
return bme680_core_probe(&client->dev, regmap, name);
}
static const struct i2c_device_id bme680_i2c_id[] = {
{"bme680", 0},
{},
};
MODULE_DEVICE_TABLE(i2c, bme680_i2c_id);
static const struct acpi_device_id bme680_acpi_match[] = {
{"BME0680", 0},
{},
};
MODULE_DEVICE_TABLE(acpi, bme680_acpi_match);
static struct i2c_driver bme680_i2c_driver = {
.driver = {
.name = "bme680_i2c",
.acpi_match_table = ACPI_PTR(bme680_acpi_match),
},
.probe = bme680_i2c_probe,
.id_table = bme680_i2c_id,
};
module_i2c_driver(bme680_i2c_driver);
MODULE_AUTHOR("Himanshu Jha <himanshujha199640@gmail.com>");
MODULE_DESCRIPTION("BME680 I2C driver");
MODULE_LICENSE("GPL v2");
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