1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * Driver for the Analog Devices digital potentiometers (I2C bus)
4  *
5  * Copyright (C) 2010-2011 Michael Hennerich, Analog Devices Inc.
6  */
7 
8 #include <linux/i2c.h>
9 #include <linux/module.h>
10 
11 #include "ad525x_dpot.h"
12 
13 /* I2C bus functions */
14 static int write_d8(void *client, u8 val)
15 {
16 	return i2c_smbus_write_byte(client, val);
17 }
18 
19 static int write_r8d8(void *client, u8 reg, u8 val)
20 {
21 	return i2c_smbus_write_byte_data(client, reg, val);
22 }
23 
24 static int write_r8d16(void *client, u8 reg, u16 val)
25 {
26 	return i2c_smbus_write_word_data(client, reg, val);
27 }
28 
29 static int read_d8(void *client)
30 {
31 	return i2c_smbus_read_byte(client);
32 }
33 
34 static int read_r8d8(void *client, u8 reg)
35 {
36 	return i2c_smbus_read_byte_data(client, reg);
37 }
38 
39 static int read_r8d16(void *client, u8 reg)
40 {
41 	return i2c_smbus_read_word_data(client, reg);
42 }
43 
44 static const struct ad_dpot_bus_ops bops = {
45 	.read_d8	= read_d8,
46 	.read_r8d8	= read_r8d8,
47 	.read_r8d16	= read_r8d16,
48 	.write_d8	= write_d8,
49 	.write_r8d8	= write_r8d8,
50 	.write_r8d16	= write_r8d16,
51 };
52 
53 static int ad_dpot_i2c_probe(struct i2c_client *client)
54 {
55 	const struct i2c_device_id *id = i2c_client_get_device_id(client);
56 	struct ad_dpot_bus_data bdata = {
57 		.client = client,
58 		.bops = &bops,
59 	};
60 
61 	if (!i2c_check_functionality(client->adapter,
62 				     I2C_FUNC_SMBUS_WORD_DATA)) {
63 		dev_err(&client->dev, "SMBUS Word Data not Supported\n");
64 		return -EIO;
65 	}
66 
67 	return ad_dpot_probe(&client->dev, &bdata, id->driver_data, id->name);
68 }
69 
70 static void ad_dpot_i2c_remove(struct i2c_client *client)
71 {
72 	ad_dpot_remove(&client->dev);
73 }
74 
75 static const struct i2c_device_id ad_dpot_id[] = {
76 	{"ad5258", AD5258_ID},
77 	{"ad5259", AD5259_ID},
78 	{"ad5251", AD5251_ID},
79 	{"ad5252", AD5252_ID},
80 	{"ad5253", AD5253_ID},
81 	{"ad5254", AD5254_ID},
82 	{"ad5255", AD5255_ID},
83 	{"ad5241", AD5241_ID},
84 	{"ad5242", AD5242_ID},
85 	{"ad5243", AD5243_ID},
86 	{"ad5245", AD5245_ID},
87 	{"ad5246", AD5246_ID},
88 	{"ad5247", AD5247_ID},
89 	{"ad5248", AD5248_ID},
90 	{"ad5280", AD5280_ID},
91 	{"ad5282", AD5282_ID},
92 	{"adn2860", ADN2860_ID},
93 	{"ad5273", AD5273_ID},
94 	{"ad5161", AD5161_ID},
95 	{"ad5171", AD5171_ID},
96 	{"ad5170", AD5170_ID},
97 	{"ad5172", AD5172_ID},
98 	{"ad5173", AD5173_ID},
99 	{"ad5272", AD5272_ID},
100 	{"ad5274", AD5274_ID},
101 	{}
102 };
103 MODULE_DEVICE_TABLE(i2c, ad_dpot_id);
104 
105 static struct i2c_driver ad_dpot_i2c_driver = {
106 	.driver = {
107 		.name	= "ad_dpot",
108 	},
109 	.probe_new	= ad_dpot_i2c_probe,
110 	.remove		= ad_dpot_i2c_remove,
111 	.id_table	= ad_dpot_id,
112 };
113 
114 module_i2c_driver(ad_dpot_i2c_driver);
115 
116 MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");
117 MODULE_DESCRIPTION("digital potentiometer I2C bus driver");
118 MODULE_LICENSE("GPL");
119