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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
18 static 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
25 static 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
33 static 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
42 static 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
63 static 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
70 static 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
77 static int adxl34x_i2c_probe(struct i2c_client *client)
78 {
79         struct adxl34x *ac;
80         int error;
81
82         error = i2c_check_functionality(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(&client->dev, client->irq, false,
90                            i2c_check_functionality(client->adapter,
91                                                    I2C_FUNC_SMBUS_READ_I2C_BLOCK) ?
92                                 &adxl34x_smbus_bops : &adxl34x_i2c_bops);
93         if (IS_ERR(ac))
94                 return PTR_ERR(ac);
95
96         i2c_set_clientdata(client, ac);
97
98         return 0;
99 }
100
101 static void adxl34x_i2c_remove(struct i2c_client *client)
102 {
103         struct adxl34x *ac = i2c_get_clientdata(client);
104
105         adxl34x_remove(ac);
106 }
107
108 static int __maybe_unused adxl34x_i2c_suspend(struct device *dev)
109 {
110         struct i2c_client *client = to_i2c_client(dev);
111         struct adxl34x *ac = i2c_get_clientdata(client);
112
113         adxl34x_suspend(ac);
114
115         return 0;
116 }
117
118 static int __maybe_unused adxl34x_i2c_resume(struct device *dev)
119 {
120         struct i2c_client *client = to_i2c_client(dev);
121         struct adxl34x *ac = i2c_get_clientdata(client);
122
123         adxl34x_resume(ac);
124
125         return 0;
126 }
127
128 static SIMPLE_DEV_PM_OPS(adxl34x_i2c_pm, adxl34x_i2c_suspend,
129                          adxl34x_i2c_resume);
130
131 static const struct i2c_device_id adxl34x_id[] = {
132         { "adxl34x", 0 },
133         { }
134 };
135
136 MODULE_DEVICE_TABLE(i2c, adxl34x_id);
137
138 static const struct of_device_id adxl34x_of_id[] = {
139         /*
140          * The ADXL346 is backward-compatible with the ADXL345. Differences are
141          * handled by runtime detection of the device model, there's thus no
142          * need for listing the "adi,adxl346" compatible value explicitly.
143          */
144         { .compatible = "adi,adxl345", },
145         /*
146          * Deprecated, DT nodes should use one or more of the device-specific
147          * compatible values "adi,adxl345" and "adi,adxl346".
148          */
149         { .compatible = "adi,adxl34x", },
150         { }
151 };
152
153 MODULE_DEVICE_TABLE(of, adxl34x_of_id);
154
155 static struct i2c_driver adxl34x_driver = {
156         .driver = {
157                 .name = "adxl34x",
158                 .pm = &adxl34x_i2c_pm,
159                 .of_match_table = adxl34x_of_id,
160         },
161         .probe_new = adxl34x_i2c_probe,
162         .remove   = adxl34x_i2c_remove,
163         .id_table = adxl34x_id,
164 };
165
166 module_i2c_driver(adxl34x_driver);
167
168 MODULE_AUTHOR("Michael Hennerich <[email protected]>");
169 MODULE_DESCRIPTION("ADXL345/346 Three-Axis Digital Accelerometer I2C Bus Driver");
170 MODULE_LICENSE("GPL");
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