1 /*
2  * Driver for the Analog Devices digital potentiometers (I2C bus)
3  *
4  * Copyright (C) 2010 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 /* ------------------------------------------------------------------------- */
15 /* I2C bus functions */
16 static int write_d8(void *client, u8 val)
17 {
18 	return i2c_smbus_write_byte(client, val);
19 }
20 
21 static int write_r8d8(void *client, u8 reg, u8 val)
22 {
23 	return i2c_smbus_write_byte_data(client, reg, val);
24 }
25 
26 static int write_r8d16(void *client, u8 reg, u16 val)
27 {
28 	return i2c_smbus_write_word_data(client, reg, val);
29 }
30 
31 static int read_d8(void *client)
32 {
33 	return i2c_smbus_read_byte(client);
34 }
35 
36 static int read_r8d8(void *client, u8 reg)
37 {
38 	return i2c_smbus_read_byte_data(client, reg);
39 }
40 
41 static int read_r8d16(void *client, u8 reg)
42 {
43 	return i2c_smbus_read_word_data(client, reg);
44 }
45 
46 static const struct ad_dpot_bus_ops bops = {
47 	.read_d8	= read_d8,
48 	.read_r8d8	= read_r8d8,
49 	.read_r8d16	= read_r8d16,
50 	.write_d8	= write_d8,
51 	.write_r8d8	= write_r8d8,
52 	.write_r8d16	= write_r8d16,
53 };
54 
55 static int __devinit ad_dpot_i2c_probe(struct i2c_client *client,
56 				      const struct i2c_device_id *id)
57 {
58 	struct ad_dpot_bus_data bdata = {
59 		.client = client,
60 		.bops = &bops,
61 	};
62 
63 	struct ad_dpot_id dpot_id = {
64 		.name = (char *) &id->name,
65 		.devid = id->driver_data,
66 	};
67 
68 	if (!i2c_check_functionality(client->adapter,
69 				     I2C_FUNC_SMBUS_WORD_DATA)) {
70 		dev_err(&client->dev, "SMBUS Word Data not Supported\n");
71 		return -EIO;
72 	}
73 
74 	return ad_dpot_probe(&client->dev, &bdata, &dpot_id);
75 }
76 
77 static int __devexit ad_dpot_i2c_remove(struct i2c_client *client)
78 {
79 	return ad_dpot_remove(&client->dev);
80 }
81 
82 static const struct i2c_device_id ad_dpot_id[] = {
83 	{"ad5258", AD5258_ID},
84 	{"ad5259", AD5259_ID},
85 	{"ad5251", AD5251_ID},
86 	{"ad5252", AD5252_ID},
87 	{"ad5253", AD5253_ID},
88 	{"ad5254", AD5254_ID},
89 	{"ad5255", AD5255_ID},
90 	{}
91 };
92 MODULE_DEVICE_TABLE(i2c, ad_dpot_id);
93 
94 static struct i2c_driver ad_dpot_i2c_driver = {
95 	.driver = {
96 		.name	= "ad_dpot",
97 		.owner	= THIS_MODULE,
98 	},
99 	.probe		= ad_dpot_i2c_probe,
100 	.remove		= __devexit_p(ad_dpot_i2c_remove),
101 	.id_table	= ad_dpot_id,
102 };
103 
104 static int __init ad_dpot_i2c_init(void)
105 {
106 	return i2c_add_driver(&ad_dpot_i2c_driver);
107 }
108 module_init(ad_dpot_i2c_init);
109 
110 static void __exit ad_dpot_i2c_exit(void)
111 {
112 	i2c_del_driver(&ad_dpot_i2c_driver);
113 }
114 module_exit(ad_dpot_i2c_exit);
115 
116 MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
117 MODULE_DESCRIPTION("digital potentiometer I2C bus driver");
118 MODULE_LICENSE("GPL");
119 MODULE_ALIAS("i2c:ad_dpot");
120