1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * ADXL372 3-Axis Digital Accelerometer I2C driver
4  *
5  * Copyright 2018 Analog Devices Inc.
6  */
7 
8 #include <linux/i2c.h>
9 #include <linux/mod_devicetable.h>
10 #include <linux/module.h>
11 #include <linux/regmap.h>
12 
13 #include "adxl372.h"
14 
15 static const struct regmap_config adxl372_regmap_config = {
16 	.reg_bits = 8,
17 	.val_bits = 8,
18 	.readable_noinc_reg = adxl372_readable_noinc_reg,
19 };
20 
adxl372_i2c_probe(struct i2c_client * client,const struct i2c_device_id * id)21 static int adxl372_i2c_probe(struct i2c_client *client,
22 			     const struct i2c_device_id *id)
23 {
24 	struct regmap *regmap;
25 	unsigned int regval;
26 	int ret;
27 
28 	regmap = devm_regmap_init_i2c(client, &adxl372_regmap_config);
29 	if (IS_ERR(regmap))
30 		return PTR_ERR(regmap);
31 
32 	ret = regmap_read(regmap, ADXL372_REVID, &regval);
33 	if (ret < 0)
34 		return ret;
35 
36 	/* Starting with the 3rd revision an I2C chip bug was fixed */
37 	if (regval < 3)
38 		dev_warn(&client->dev,
39 		"I2C might not work properly with other devices on the bus");
40 
41 	return adxl372_probe(&client->dev, regmap, client->irq, id->name);
42 }
43 
44 static const struct i2c_device_id adxl372_i2c_id[] = {
45 	{ "adxl372", 0 },
46 	{}
47 };
48 MODULE_DEVICE_TABLE(i2c, adxl372_i2c_id);
49 
50 static const struct of_device_id adxl372_of_match[] = {
51 	{ .compatible = "adi,adxl372" },
52 	{ }
53 };
54 MODULE_DEVICE_TABLE(of, adxl372_of_match);
55 
56 static struct i2c_driver adxl372_i2c_driver = {
57 	.driver = {
58 		.name = "adxl372_i2c",
59 		.of_match_table = adxl372_of_match,
60 	},
61 	.probe = adxl372_i2c_probe,
62 	.id_table = adxl372_i2c_id,
63 };
64 
65 module_i2c_driver(adxl372_i2c_driver);
66 
67 MODULE_AUTHOR("Stefan Popa <stefan.popa@analog.com>");
68 MODULE_DESCRIPTION("Analog Devices ADXL372 3-axis accelerometer I2C driver");
69 MODULE_LICENSE("GPL");
70