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