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 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 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