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1 | /* |
2 | * ADLX345/346 Three-Axis Digital Accelerometers (I2C Interface) |
3 | * |
4 | * Enter bugs at http://blackfin.uclinux.org/ |
5 | * |
6 | * Copyright (C) 2009 Michael Hennerich, Analog Devices Inc. |
7 | * Licensed under the GPL-2 or later. |
8 | */ |
9 | |
10 | #include <linux/input.h> /* BUS_I2C */ |
11 | #include <linux/i2c.h> |
12 | #include <linux/module.h> |
13 | #include <linux/types.h> |
14 | #include <linux/pm.h> |
15 | #include "adxl34x.h" |
16 | |
17 | static int adxl34x_smbus_read(struct device *dev, unsigned char reg) |
18 | { |
19 | struct i2c_client *client = to_i2c_client(dev); |
20 | |
21 | return i2c_smbus_read_byte_data(client, reg); |
22 | } |
23 | |
24 | static int adxl34x_smbus_write(struct device *dev, |
25 | unsigned char reg, unsigned char val) |
26 | { |
27 | struct i2c_client *client = to_i2c_client(dev); |
28 | |
29 | return i2c_smbus_write_byte_data(client, reg, val); |
30 | } |
31 | |
32 | static int adxl34x_smbus_read_block(struct device *dev, |
33 | unsigned char reg, int count, |
34 | void *buf) |
35 | { |
36 | struct i2c_client *client = to_i2c_client(dev); |
37 | |
38 | return i2c_smbus_read_i2c_block_data(client, reg, count, buf); |
39 | } |
40 | |
41 | static int adxl34x_i2c_read_block(struct device *dev, |
42 | unsigned char reg, int count, |
43 | void *buf) |
44 | { |
45 | struct i2c_client *client = to_i2c_client(dev); |
46 | int ret; |
47 | |
48 | ret = i2c_master_send(client, ®, 1); |
49 | if (ret < 0) |
50 | return ret; |
51 | |
52 | ret = i2c_master_recv(client, buf, count); |
53 | if (ret < 0) |
54 | return ret; |
55 | |
56 | if (ret != count) |
57 | return -EIO; |
58 | |
59 | return 0; |
60 | } |
61 | |
62 | static const struct adxl34x_bus_ops adxl34x_smbus_bops = { |
63 | .bustype = BUS_I2C, |
64 | .write = adxl34x_smbus_write, |
65 | .read = adxl34x_smbus_read, |
66 | .read_block = adxl34x_smbus_read_block, |
67 | }; |
68 | |
69 | static const struct adxl34x_bus_ops adxl34x_i2c_bops = { |
70 | .bustype = BUS_I2C, |
71 | .write = adxl34x_smbus_write, |
72 | .read = adxl34x_smbus_read, |
73 | .read_block = adxl34x_i2c_read_block, |
74 | }; |
75 | |
76 | static int adxl34x_i2c_probe(struct i2c_client *client, |
77 | const struct i2c_device_id *id) |
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 int adxl34x_i2c_remove(struct i2c_client *client) |
102 | { |
103 | struct adxl34x *ac = i2c_get_clientdata(client); |
104 | |
105 | return adxl34x_remove(ac); |
106 | } |
107 | |
108 | #ifdef CONFIG_PM |
109 | static int 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 | |
119 | static int 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 | #endif |
129 | |
130 | static SIMPLE_DEV_PM_OPS(adxl34x_i2c_pm, adxl34x_i2c_suspend, |
131 | adxl34x_i2c_resume); |
132 | |
133 | static const struct i2c_device_id adxl34x_id[] = { |
134 | { "adxl34x", 0 }, |
135 | { } |
136 | }; |
137 | |
138 | MODULE_DEVICE_TABLE(i2c, adxl34x_id); |
139 | |
140 | static struct i2c_driver adxl34x_driver = { |
141 | .driver = { |
142 | .name = "adxl34x", |
143 | .owner = THIS_MODULE, |
144 | .pm = &adxl34x_i2c_pm, |
145 | }, |
146 | .probe = adxl34x_i2c_probe, |
147 | .remove = adxl34x_i2c_remove, |
148 | .id_table = adxl34x_id, |
149 | }; |
150 | |
151 | module_i2c_driver(adxl34x_driver); |
152 | |
153 | MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>"); |
154 | MODULE_DESCRIPTION("ADXL345/346 Three-Axis Digital Accelerometer I2C Bus Driver"); |
155 | MODULE_LICENSE("GPL"); |
156 |
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