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, 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, reg, 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, reg, count, 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, &reg, 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				       const struct i2c_device_id *id)
79{
80	struct adxl34x *ac;
81	int error;
82
83	error = i2c_check_functionality(client->adapter,
84			I2C_FUNC_SMBUS_BYTE_DATA);
85	if (!error) {
86		dev_err(&client->dev, "SMBUS Byte Data not Supported\n");
87		return -EIO;
88	}
89
90	ac = adxl34x_probe(&client->dev, client->irq, false,
91			   i2c_check_functionality(client->adapter,
92						   I2C_FUNC_SMBUS_READ_I2C_BLOCK) ?
93				&adxl34x_smbus_bops : &adxl34x_i2c_bops);
94	if (IS_ERR(ac))
95		return PTR_ERR(ac);
96
97	i2c_set_clientdata(client, ac);
98
99	return 0;
100}
101
102static int adxl34x_i2c_remove(struct i2c_client *client)
103{
104	struct adxl34x *ac = i2c_get_clientdata(client);
105
106	return adxl34x_remove(ac);
107}
108
109static int __maybe_unused adxl34x_i2c_suspend(struct device *dev)
110{
111	struct i2c_client *client = to_i2c_client(dev);
112	struct adxl34x *ac = i2c_get_clientdata(client);
113
114	adxl34x_suspend(ac);
115
116	return 0;
117}
118
119static int __maybe_unused adxl34x_i2c_resume(struct device *dev)
120{
121	struct i2c_client *client = to_i2c_client(dev);
122	struct adxl34x *ac = i2c_get_clientdata(client);
123
124	adxl34x_resume(ac);
125
126	return 0;
127}
128
129static SIMPLE_DEV_PM_OPS(adxl34x_i2c_pm, adxl34x_i2c_suspend,
130			 adxl34x_i2c_resume);
131
132static const struct i2c_device_id adxl34x_id[] = {
133	{ "adxl34x", 0 },
134	{ }
135};
136
137MODULE_DEVICE_TABLE(i2c, adxl34x_id);
138
139static const struct of_device_id adxl34x_of_id[] = {
140	/*
141	 * The ADXL346 is backward-compatible with the ADXL345. Differences are
142	 * handled by runtime detection of the device model, there's thus no
143	 * need for listing the "adi,adxl346" compatible value explicitly.
144	 */
145	{ .compatible = "adi,adxl345", },
146	/*
147	 * Deprecated, DT nodes should use one or more of the device-specific
148	 * compatible values "adi,adxl345" and "adi,adxl346".
149	 */
150	{ .compatible = "adi,adxl34x", },
151	{ }
152};
153
154MODULE_DEVICE_TABLE(of, adxl34x_of_id);
155
156static struct i2c_driver adxl34x_driver = {
157	.driver = {
158		.name = "adxl34x",
159		.pm = &adxl34x_i2c_pm,
160		.of_match_table = adxl34x_of_id,
161	},
162	.probe    = adxl34x_i2c_probe,
163	.remove   = adxl34x_i2c_remove,
164	.id_table = adxl34x_id,
165};
166
167module_i2c_driver(adxl34x_driver);
168
169MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
170MODULE_DESCRIPTION("ADXL345/346 Three-Axis Digital Accelerometer I2C Bus Driver");
171MODULE_LICENSE("GPL");
172