blob: da5f0789fb97b937b2ad7f23ec8c9474bf41fa80 [file] [log] [blame]
Lars-Peter Clausen51c2a482013-03-12 11:38:46 +01001/*
2 * ADT7310/ADT7310 digital temperature sensor driver
3 *
4 * Copyright 2012-2013 Analog Devices Inc.
5 * Author: Lars-Peter Clausen <lars@metafoo.de>
6 *
7 * Licensed under the GPL-2 or later.
8 */
9
10#include <linux/module.h>
11#include <linux/init.h>
12#include <linux/spi/spi.h>
13#include <asm/unaligned.h>
14
15#include "adt7x10.h"
16
17#define ADT7310_STATUS 0
18#define ADT7310_CONFIG 1
19#define ADT7310_TEMPERATURE 2
20#define ADT7310_ID 3
21#define ADT7310_T_CRIT 4
22#define ADT7310_T_HYST 5
23#define ADT7310_T_ALARM_HIGH 6
24#define ADT7310_T_ALARM_LOW 7
25
26static const u8 adt7310_reg_table[] = {
27 [ADT7X10_TEMPERATURE] = ADT7310_TEMPERATURE,
28 [ADT7X10_STATUS] = ADT7310_STATUS,
29 [ADT7X10_CONFIG] = ADT7310_CONFIG,
30 [ADT7X10_T_ALARM_HIGH] = ADT7310_T_ALARM_HIGH,
31 [ADT7X10_T_ALARM_LOW] = ADT7310_T_ALARM_LOW,
32 [ADT7X10_T_CRIT] = ADT7310_T_CRIT,
33 [ADT7X10_T_HYST] = ADT7310_T_HYST,
34 [ADT7X10_ID] = ADT7310_ID,
35};
36
37#define ADT7310_CMD_REG_OFFSET 3
38#define ADT7310_CMD_READ 0x40
39
40#define AD7310_COMMAND(reg) (adt7310_reg_table[(reg)] << ADT7310_CMD_REG_OFFSET)
41
42static int adt7310_spi_read_word(struct device *dev, u8 reg)
43{
44 struct spi_device *spi = to_spi_device(dev);
45 int ret;
46
47 ret = spi_w8r16(spi, AD7310_COMMAND(reg) | ADT7310_CMD_READ);
48 if (ret < 0)
49 return ret;
50
Guenter Roeck71bb2d22013-03-18 03:46:12 -070051 return be16_to_cpu((__force __be16)ret);
Lars-Peter Clausen51c2a482013-03-12 11:38:46 +010052}
53
54static int adt7310_spi_write_word(struct device *dev, u8 reg, u16 data)
55{
56 struct spi_device *spi = to_spi_device(dev);
57 u8 buf[3];
58
59 buf[0] = AD7310_COMMAND(reg);
60 put_unaligned_be16(data, &buf[1]);
61
62 return spi_write(spi, buf, sizeof(buf));
63}
64
65static int adt7310_spi_read_byte(struct device *dev, u8 reg)
66{
67 struct spi_device *spi = to_spi_device(dev);
68
69 return spi_w8r8(spi, AD7310_COMMAND(reg) | ADT7310_CMD_READ);
70}
71
72static int adt7310_spi_write_byte(struct device *dev, u8 reg,
73 u8 data)
74{
75 struct spi_device *spi = to_spi_device(dev);
76 u8 buf[2];
77
78 buf[0] = AD7310_COMMAND(reg);
79 buf[1] = data;
80
81 return spi_write(spi, buf, sizeof(buf));
82}
83
84static const struct adt7x10_ops adt7310_spi_ops = {
85 .read_word = adt7310_spi_read_word,
86 .write_word = adt7310_spi_write_word,
87 .read_byte = adt7310_spi_read_byte,
88 .write_byte = adt7310_spi_write_byte,
89};
90
91static int adt7310_spi_probe(struct spi_device *spi)
92{
Lars-Peter Clausen4b5e5362013-03-12 11:38:47 +010093 return adt7x10_probe(&spi->dev, spi_get_device_id(spi)->name, spi->irq,
Lars-Peter Clausen51c2a482013-03-12 11:38:46 +010094 &adt7310_spi_ops);
95}
96
97static int adt7310_spi_remove(struct spi_device *spi)
98{
Lars-Peter Clausen4b5e5362013-03-12 11:38:47 +010099 return adt7x10_remove(&spi->dev, spi->irq);
Lars-Peter Clausen51c2a482013-03-12 11:38:46 +0100100}
101
102static const struct spi_device_id adt7310_id[] = {
103 { "adt7310", 0 },
104 { "adt7320", 0 },
105 {}
106};
107MODULE_DEVICE_TABLE(spi, adt7310_id);
108
109static struct spi_driver adt7310_driver = {
110 .driver = {
111 .name = "adt7310",
112 .owner = THIS_MODULE,
113 .pm = ADT7X10_DEV_PM_OPS,
114 },
115 .probe = adt7310_spi_probe,
116 .remove = adt7310_spi_remove,
117 .id_table = adt7310_id,
118};
119module_spi_driver(adt7310_driver);
120
121MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
122MODULE_DESCRIPTION("ADT7310/ADT7320 driver");
123MODULE_LICENSE("GPL");