2 * I2C bus driver for ADT7316/7/8 ADT7516/7/9 digital temperature
5 * Copyright 2010 Analog Devices Inc.
7 * Licensed under the GPL-2 or later.
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>
19 * adt7316 register access by I2C
21 static int adt7316_i2c_read(void *client, u8 reg, u8 *data)
23 struct i2c_client *cl = client;
26 ret = i2c_smbus_write_byte(cl, reg);
28 dev_err(&cl->dev, "I2C fail to select reg\n");
32 ret = i2c_smbus_read_byte(client);
34 dev_err(&cl->dev, "I2C read error\n");
43 static int adt7316_i2c_write(void *client, u8 reg, u8 data)
45 struct i2c_client *cl = client;
48 ret = i2c_smbus_write_byte_data(cl, reg, data);
50 dev_err(&cl->dev, "I2C write error\n");
55 static int adt7316_i2c_multi_read(void *client, u8 reg, u8 count, u8 *data)
57 struct i2c_client *cl = client;
60 if (count > ADT7316_REG_MAX_ADDR)
61 count = ADT7316_REG_MAX_ADDR;
63 for (i = 0; i < count; i++) {
64 ret = adt7316_i2c_read(cl, reg, &data[i]);
66 dev_err(&cl->dev, "I2C multi read error\n");
74 static int adt7316_i2c_multi_write(void *client, u8 reg, u8 count, u8 *data)
76 struct i2c_client *cl = client;
79 if (count > ADT7316_REG_MAX_ADDR)
80 count = ADT7316_REG_MAX_ADDR;
82 for (i = 0; i < count; i++) {
83 ret = adt7316_i2c_write(cl, reg, data[i]);
85 dev_err(&cl->dev, "I2C multi write error\n");
94 * device probe and remove
97 static int adt7316_i2c_probe(struct i2c_client *client,
98 const struct i2c_device_id *id)
100 struct adt7316_bus bus = {
103 .irq_flags = IRQF_TRIGGER_LOW,
104 .read = adt7316_i2c_read,
105 .write = adt7316_i2c_write,
106 .multi_read = adt7316_i2c_multi_read,
107 .multi_write = adt7316_i2c_multi_write,
110 return adt7316_probe(&client->dev, &bus, id->name);
113 static const struct i2c_device_id adt7316_i2c_id[] = {
123 MODULE_DEVICE_TABLE(i2c, adt7316_i2c_id);
125 static struct i2c_driver adt7316_driver = {
128 .pm = ADT7316_PM_OPS,
130 .probe = adt7316_i2c_probe,
131 .id_table = adt7316_i2c_id,
133 module_i2c_driver(adt7316_driver);
135 MODULE_AUTHOR("Sonic Zhang <sonic.zhang@analog.com>");
136 MODULE_DESCRIPTION("I2C bus driver for Analog Devices ADT7316/7/9 and ADT7516/7/8 digital temperature sensor, ADC and DAC");
137 MODULE_LICENSE("GPL v2");