Tegra CEC Support
[linux-2.6.git] / drivers / misc / ad525x_dpot-i2c.c
1 /*
2  * Driver for the Analog Devices digital potentiometers (I2C bus)
3  *
4  * Copyright (C) 2010-2011 Michael Hennerich, Analog Devices Inc.
5  *
6  * Licensed under the GPL-2 or later.
7  */
8
9 #include <linux/i2c.h>
10 #include <linux/module.h>
11
12 #include "ad525x_dpot.h"
13
14 /* I2C bus functions */
15 static int write_d8(void *client, u8 val)
16 {
17         return i2c_smbus_write_byte(client, val);
18 }
19
20 static int write_r8d8(void *client, u8 reg, u8 val)
21 {
22         return i2c_smbus_write_byte_data(client, reg, val);
23 }
24
25 static int write_r8d16(void *client, u8 reg, u16 val)
26 {
27         return i2c_smbus_write_word_data(client, reg, val);
28 }
29
30 static int read_d8(void *client)
31 {
32         return i2c_smbus_read_byte(client);
33 }
34
35 static int read_r8d8(void *client, u8 reg)
36 {
37         return i2c_smbus_read_byte_data(client, reg);
38 }
39
40 static int read_r8d16(void *client, u8 reg)
41 {
42         return i2c_smbus_read_word_data(client, reg);
43 }
44
45 static const struct ad_dpot_bus_ops bops = {
46         .read_d8        = read_d8,
47         .read_r8d8      = read_r8d8,
48         .read_r8d16     = read_r8d16,
49         .write_d8       = write_d8,
50         .write_r8d8     = write_r8d8,
51         .write_r8d16    = write_r8d16,
52 };
53
54 static int __devinit ad_dpot_i2c_probe(struct i2c_client *client,
55                                       const struct i2c_device_id *id)
56 {
57         struct ad_dpot_bus_data bdata = {
58                 .client = client,
59                 .bops = &bops,
60         };
61
62         if (!i2c_check_functionality(client->adapter,
63                                      I2C_FUNC_SMBUS_WORD_DATA)) {
64                 dev_err(&client->dev, "SMBUS Word Data not Supported\n");
65                 return -EIO;
66         }
67
68         return ad_dpot_probe(&client->dev, &bdata, id->driver_data, id->name);
69 }
70
71 static int __devexit ad_dpot_i2c_remove(struct i2c_client *client)
72 {
73         return ad_dpot_remove(&client->dev);
74 }
75
76 static const struct i2c_device_id ad_dpot_id[] = {
77         {"ad5258", AD5258_ID},
78         {"ad5259", AD5259_ID},
79         {"ad5251", AD5251_ID},
80         {"ad5252", AD5252_ID},
81         {"ad5253", AD5253_ID},
82         {"ad5254", AD5254_ID},
83         {"ad5255", AD5255_ID},
84         {"ad5241", AD5241_ID},
85         {"ad5242", AD5242_ID},
86         {"ad5243", AD5243_ID},
87         {"ad5245", AD5245_ID},
88         {"ad5246", AD5246_ID},
89         {"ad5247", AD5247_ID},
90         {"ad5248", AD5248_ID},
91         {"ad5280", AD5280_ID},
92         {"ad5282", AD5282_ID},
93         {"adn2860", ADN2860_ID},
94         {"ad5273", AD5273_ID},
95         {"ad5161", AD5161_ID},
96         {"ad5171", AD5171_ID},
97         {"ad5170", AD5170_ID},
98         {"ad5172", AD5172_ID},
99         {"ad5173", AD5173_ID},
100         {"ad5272", AD5272_ID},
101         {"ad5274", AD5274_ID},
102         {}
103 };
104 MODULE_DEVICE_TABLE(i2c, ad_dpot_id);
105
106 static struct i2c_driver ad_dpot_i2c_driver = {
107         .driver = {
108                 .name   = "ad_dpot",
109                 .owner  = THIS_MODULE,
110         },
111         .probe          = ad_dpot_i2c_probe,
112         .remove         = __devexit_p(ad_dpot_i2c_remove),
113         .id_table       = ad_dpot_id,
114 };
115
116 module_i2c_driver(ad_dpot_i2c_driver);
117
118 MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
119 MODULE_DESCRIPTION("digital potentiometer I2C bus driver");
120 MODULE_LICENSE("GPL");
121 MODULE_ALIAS("i2c:ad_dpot");