1 /*
2  * I2C bus driver for ADT7316/7/8 ADT7516/7/9 digital temperature
3  * sensor, ADC and DAC
4  *
5  * Copyright 2010 Analog Devices Inc.
6  *
7  * Licensed under the GPL-2 or later.
8  */
9 
10 #include <linux/device.h>
11 #include <linux/kernel.h>
12 #include <linux/i2c.h>
13 #include <linux/interrupt.h>
14 #include <linux/module.h>
15 
16 #include "adt7316.h"
17 
18 /*
19  * adt7316 register access by I2C
20  */
21 static int adt7316_i2c_read(void *client, u8 reg, u8 *data)
22 {
23 	struct i2c_client *cl = client;
24 	int ret;
25 
26 	ret = i2c_smbus_write_byte(cl, reg);
27 	if (ret < 0) {
28 		dev_err(&cl->dev, "I2C fail to select reg\n");
29 		return ret;
30 	}
31 
32 	ret = i2c_smbus_read_byte(client);
33 	if (ret < 0) {
34 		dev_err(&cl->dev, "I2C read error\n");
35 		return ret;
36 	}
37 
38 	*data = ret;
39 
40 	return 0;
41 }
42 
43 static int adt7316_i2c_write(void *client, u8 reg, u8 data)
44 {
45 	struct i2c_client *cl = client;
46 	int ret;
47 
48 	ret = i2c_smbus_write_byte_data(cl, reg, data);
49 	if (ret < 0)
50 		dev_err(&cl->dev, "I2C write error\n");
51 
52 	return ret;
53 }
54 
55 static int adt7316_i2c_multi_read(void *client, u8 reg, u8 count, u8 *data)
56 {
57 	struct i2c_client *cl = client;
58 	int i, ret;
59 
60 	if (count > ADT7316_REG_MAX_ADDR)
61 		count = ADT7316_REG_MAX_ADDR;
62 
63 	for (i = 0; i < count; i++) {
64 		ret = adt7316_i2c_read(cl, reg, &data[i]);
65 		if (ret < 0) {
66 			dev_err(&cl->dev, "I2C multi read error\n");
67 			return ret;
68 		}
69 	}
70 
71 	return 0;
72 }
73 
74 static int adt7316_i2c_multi_write(void *client, u8 reg, u8 count, u8 *data)
75 {
76 	struct i2c_client *cl = client;
77 	int i, ret;
78 
79 	if (count > ADT7316_REG_MAX_ADDR)
80 		count = ADT7316_REG_MAX_ADDR;
81 
82 	for (i = 0; i < count; i++) {
83 		ret = adt7316_i2c_write(cl, reg, data[i]);
84 		if (ret < 0) {
85 			dev_err(&cl->dev, "I2C multi write error\n");
86 			return ret;
87 		}
88 	}
89 
90 	return 0;
91 }
92 
93 /*
94  * device probe and remove
95  */
96 
97 static int adt7316_i2c_probe(struct i2c_client *client,
98 			     const struct i2c_device_id *id)
99 {
100 	struct adt7316_bus bus = {
101 		.client = client,
102 		.irq = client->irq,
103 		.read = adt7316_i2c_read,
104 		.write = adt7316_i2c_write,
105 		.multi_read = adt7316_i2c_multi_read,
106 		.multi_write = adt7316_i2c_multi_write,
107 	};
108 
109 	return adt7316_probe(&client->dev, &bus, id->name);
110 }
111 
112 static const struct i2c_device_id adt7316_i2c_id[] = {
113 	{ "adt7316", 0 },
114 	{ "adt7317", 0 },
115 	{ "adt7318", 0 },
116 	{ "adt7516", 0 },
117 	{ "adt7517", 0 },
118 	{ "adt7519", 0 },
119 	{ }
120 };
121 
122 MODULE_DEVICE_TABLE(i2c, adt7316_i2c_id);
123 
124 static const struct of_device_id adt7316_of_match[] = {
125 	{ .compatible = "adi,adt7316" },
126 	{ .compatible = "adi,adt7317" },
127 	{ .compatible = "adi,adt7318" },
128 	{ .compatible = "adi,adt7516" },
129 	{ .compatible = "adi,adt7517" },
130 	{ .compatible = "adi,adt7519" },
131 	{ },
132 };
133 
134 MODULE_DEVICE_TABLE(of, adt7316_of_match);
135 
136 static struct i2c_driver adt7316_driver = {
137 	.driver = {
138 		.name = "adt7316",
139 		.of_match_table = adt7316_of_match,
140 		.pm = ADT7316_PM_OPS,
141 	},
142 	.probe = adt7316_i2c_probe,
143 	.id_table = adt7316_i2c_id,
144 };
145 module_i2c_driver(adt7316_driver);
146 
147 MODULE_AUTHOR("Sonic Zhang <sonic.zhang@analog.com>");
148 MODULE_DESCRIPTION("I2C bus driver for Analog Devices ADT7316/7/9 and ADT7516/7/8 digital temperature sensor, ADC and DAC");
149 MODULE_LICENSE("GPL v2");
150