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 */
21static int adt7316_i2c_read(void *client, u8 reg, u8 *data)
22{
23	struct i2c_client *cl = client;
24	int ret = 0;
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
41static 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
53static 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
72static 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
95static 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
111static 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
121MODULE_DEVICE_TABLE(i2c, adt7316_i2c_id);
122
123static struct i2c_driver adt7316_driver = {
124	.driver = {
125		.name = "adt7316",
126		.pm = ADT7316_PM_OPS,
127		.owner  = THIS_MODULE,
128	},
129	.probe = adt7316_i2c_probe,
130	.id_table = adt7316_i2c_id,
131};
132module_i2c_driver(adt7316_driver);
133
134MODULE_AUTHOR("Sonic Zhang <sonic.zhang@analog.com>");
135MODULE_DESCRIPTION("I2C bus driver for Analog Devices ADT7316/7/9 and ADT7516/7/8 digital temperature sensor, ADC and DAC");
136MODULE_LICENSE("GPL v2");
137