1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * ADLX345/346 Three-Axis Digital Accelerometers (I2C Interface)
4 *
5 * Enter bugs at http://blackfin.uclinux.org/
6 *
7 * Copyright (C) 2009 Michael Hennerich, Analog Devices Inc.
8 */
9
10#include <linux/input.h> /* BUS_I2C */
11#include <linux/i2c.h>
12#include <linux/module.h>
13#include <linux/of.h>
14#include <linux/types.h>
15#include <linux/pm.h>
16#include "adxl34x.h"
17
18static int adxl34x_smbus_read(struct device *dev, unsigned char reg)
19{
20 struct i2c_client *client = to_i2c_client(dev);
21
22 return i2c_smbus_read_byte_data(client, command: reg);
23}
24
25static int adxl34x_smbus_write(struct device *dev,
26 unsigned char reg, unsigned char val)
27{
28 struct i2c_client *client = to_i2c_client(dev);
29
30 return i2c_smbus_write_byte_data(client, command: reg, value: val);
31}
32
33static int adxl34x_smbus_read_block(struct device *dev,
34 unsigned char reg, int count,
35 void *buf)
36{
37 struct i2c_client *client = to_i2c_client(dev);
38
39 return i2c_smbus_read_i2c_block_data(client, command: reg, length: count, values: buf);
40}
41
42static int adxl34x_i2c_read_block(struct device *dev,
43 unsigned char reg, int count,
44 void *buf)
45{
46 struct i2c_client *client = to_i2c_client(dev);
47 int ret;
48
49 ret = i2c_master_send(client, buf: &reg, count: 1);
50 if (ret < 0)
51 return ret;
52
53 ret = i2c_master_recv(client, buf, count);
54 if (ret < 0)
55 return ret;
56
57 if (ret != count)
58 return -EIO;
59
60 return 0;
61}
62
63static const struct adxl34x_bus_ops adxl34x_smbus_bops = {
64 .bustype = BUS_I2C,
65 .write = adxl34x_smbus_write,
66 .read = adxl34x_smbus_read,
67 .read_block = adxl34x_smbus_read_block,
68};
69
70static const struct adxl34x_bus_ops adxl34x_i2c_bops = {
71 .bustype = BUS_I2C,
72 .write = adxl34x_smbus_write,
73 .read = adxl34x_smbus_read,
74 .read_block = adxl34x_i2c_read_block,
75};
76
77static int adxl34x_i2c_probe(struct i2c_client *client)
78{
79 struct adxl34x *ac;
80 int error;
81
82 error = i2c_check_functionality(adap: client->adapter,
83 I2C_FUNC_SMBUS_BYTE_DATA);
84 if (!error) {
85 dev_err(&client->dev, "SMBUS Byte Data not Supported\n");
86 return -EIO;
87 }
88
89 ac = adxl34x_probe(dev: &client->dev, irq: client->irq, fifo_delay_default: false,
90 bops: i2c_check_functionality(adap: client->adapter,
91 I2C_FUNC_SMBUS_READ_I2C_BLOCK) ?
92 &adxl34x_smbus_bops : &adxl34x_i2c_bops);
93 if (IS_ERR(ptr: ac))
94 return PTR_ERR(ptr: ac);
95
96 i2c_set_clientdata(client, data: ac);
97
98 return 0;
99}
100
101static void adxl34x_i2c_remove(struct i2c_client *client)
102{
103 struct adxl34x *ac = i2c_get_clientdata(client);
104
105 adxl34x_remove(ac);
106}
107
108static const struct i2c_device_id adxl34x_id[] = {
109 { "adxl34x", 0 },
110 { }
111};
112
113MODULE_DEVICE_TABLE(i2c, adxl34x_id);
114
115static const struct of_device_id adxl34x_of_id[] = {
116 /*
117 * The ADXL346 is backward-compatible with the ADXL345. Differences are
118 * handled by runtime detection of the device model, there's thus no
119 * need for listing the "adi,adxl346" compatible value explicitly.
120 */
121 { .compatible = "adi,adxl345", },
122 /*
123 * Deprecated, DT nodes should use one or more of the device-specific
124 * compatible values "adi,adxl345" and "adi,adxl346".
125 */
126 { .compatible = "adi,adxl34x", },
127 { }
128};
129
130MODULE_DEVICE_TABLE(of, adxl34x_of_id);
131
132static struct i2c_driver adxl34x_driver = {
133 .driver = {
134 .name = "adxl34x",
135 .pm = pm_sleep_ptr(&adxl34x_pm),
136 .of_match_table = adxl34x_of_id,
137 },
138 .probe = adxl34x_i2c_probe,
139 .remove = adxl34x_i2c_remove,
140 .id_table = adxl34x_id,
141};
142
143module_i2c_driver(adxl34x_driver);
144
145MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
146MODULE_DESCRIPTION("ADXL345/346 Three-Axis Digital Accelerometer I2C Bus Driver");
147MODULE_LICENSE("GPL");
148

source code of linux/drivers/input/misc/adxl34x-i2c.c