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 	return 0;
39 }
40 
41 static int adt7316_i2c_write(void *client, u8 reg, u8 data)
42 {
43 	struct i2c_client *cl = client;
44 	int ret = 0;
45 
46 	ret = i2c_smbus_write_byte_data(cl, reg, data);
47 	if (ret < 0)
48 		dev_err(&cl->dev, "I2C write error\n");
49 
50 	return ret;
51 }
52 
53 static int adt7316_i2c_multi_read(void *client, u8 reg, u8 count, u8 *data)
54 {
55 	struct i2c_client *cl = client;
56 	int i, ret = 0;
57 
58 	if (count > ADT7316_REG_MAX_ADDR)
59 		count = ADT7316_REG_MAX_ADDR;
60 
61 	for (i = 0; i < count; i++) {
62 		ret = adt7316_i2c_read(cl, reg, &data[i]);
63 		if (ret < 0) {
64 			dev_err(&cl->dev, "I2C multi read error\n");
65 			return ret;
66 		}
67 	}
68 
69 	return 0;
70 }
71 
72 static int adt7316_i2c_multi_write(void *client, u8 reg, u8 count, u8 *data)
73 {
74 	struct i2c_client *cl = client;
75 	int i, ret = 0;
76 
77 	if (count > ADT7316_REG_MAX_ADDR)
78 		count = ADT7316_REG_MAX_ADDR;
79 
80 	for (i = 0; i < count; i++) {
81 		ret = adt7316_i2c_write(cl, reg, data[i]);
82 		if (ret < 0) {
83 			dev_err(&cl->dev, "I2C multi write error\n");
84 			return ret;
85 		}
86 	}
87 
88 	return 0;
89 }
90 
91 /*
92  * device probe and remove
93  */
94 
95 static int adt7316_i2c_probe(struct i2c_client *client,
96 			     const struct i2c_device_id *id)
97 {
98 	struct adt7316_bus bus = {
99 		.client = client,
100 		.irq = client->irq,
101 		.irq_flags = IRQF_TRIGGER_LOW,
102 		.read = adt7316_i2c_read,
103 		.write = adt7316_i2c_write,
104 		.multi_read = adt7316_i2c_multi_read,
105 		.multi_write = adt7316_i2c_multi_write,
106 	};
107 
108 	return adt7316_probe(&client->dev, &bus, id->name);
109 }
110 
111 static const struct i2c_device_id adt7316_i2c_id[] = {
112 	{ "adt7316", 0 },
113 	{ "adt7317", 0 },
114 	{ "adt7318", 0 },
115 	{ "adt7516", 0 },
116 	{ "adt7517", 0 },
117 	{ "adt7519", 0 },
118 	{ }
119 };
120 
121 MODULE_DEVICE_TABLE(i2c, adt7316_i2c_id);
122 
123 static struct i2c_driver adt7316_driver = {
124 	.driver = {
125 		.name = "adt7316",
126 		.pm = ADT7316_PM_OPS,
127 	},
128 	.probe = adt7316_i2c_probe,
129 	.id_table = adt7316_i2c_id,
130 };
131 module_i2c_driver(adt7316_driver);
132 
133 MODULE_AUTHOR("Sonic Zhang <sonic.zhang@analog.com>");
134 MODULE_DESCRIPTION("I2C bus driver for Analog Devices ADT7316/7/9 and ADT7516/7/8 digital temperature sensor, ADC and DAC");
135 MODULE_LICENSE("GPL v2");
136