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 */
write_d8(void * client,u8 val)15 static int write_d8(void *client, u8 val)
16 {
17 return i2c_smbus_write_byte(client, val);
18 }
19
write_r8d8(void * client,u8 reg,u8 val)20 static int write_r8d8(void *client, u8 reg, u8 val)
21 {
22 return i2c_smbus_write_byte_data(client, reg, val);
23 }
24
write_r8d16(void * client,u8 reg,u16 val)25 static int write_r8d16(void *client, u8 reg, u16 val)
26 {
27 return i2c_smbus_write_word_data(client, reg, val);
28 }
29
read_d8(void * client)30 static int read_d8(void *client)
31 {
32 return i2c_smbus_read_byte(client);
33 }
34
read_r8d8(void * client,u8 reg)35 static int read_r8d8(void *client, u8 reg)
36 {
37 return i2c_smbus_read_byte_data(client, reg);
38 }
39
read_r8d16(void * client,u8 reg)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
ad_dpot_i2c_probe(struct i2c_client * client,const struct i2c_device_id * id)54 static int 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
ad_dpot_i2c_remove(struct i2c_client * client)71 static int 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 },
110 .probe = ad_dpot_i2c_probe,
111 .remove = ad_dpot_i2c_remove,
112 .id_table = ad_dpot_id,
113 };
114
115 module_i2c_driver(ad_dpot_i2c_driver);
116
117 MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
118 MODULE_DESCRIPTION("digital potentiometer I2C bus driver");
119 MODULE_LICENSE("GPL");
120