tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
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
46 return spi_w8r16be(spi, AD7310_COMMAND(reg) | ADT7310_CMD_READ);
47}
48
49static int adt7310_spi_write_word(struct device *dev, u8 reg, u16 data)
50{
51 struct spi_device *spi = to_spi_device(dev);
52 u8 buf[3];
53
54 buf[0] = AD7310_COMMAND(reg);
55 put_unaligned_be16(data, &buf[1]);
56
57 return spi_write(spi, buf, sizeof(buf));
58}
59
60static int adt7310_spi_read_byte(struct device *dev, u8 reg)
61{
62 struct spi_device *spi = to_spi_device(dev);
63
64 return spi_w8r8(spi, AD7310_COMMAND(reg) | ADT7310_CMD_READ);
65}
66
67static int adt7310_spi_write_byte(struct device *dev, u8 reg,
68 u8 data)
69{
70 struct spi_device *spi = to_spi_device(dev);
71 u8 buf[2];
72
73 buf[0] = AD7310_COMMAND(reg);
74 buf[1] = data;
75
76 return spi_write(spi, buf, sizeof(buf));
77}
78
79static const struct adt7x10_ops adt7310_spi_ops = {
80 .read_word = adt7310_spi_read_word,
81 .write_word = adt7310_spi_write_word,
82 .read_byte = adt7310_spi_read_byte,
83 .write_byte = adt7310_spi_write_byte,
84};
85
86static int adt7310_spi_probe(struct spi_device *spi)
87{
88 return adt7x10_probe(&spi->dev, spi_get_device_id(spi)->name, spi->irq,
89 &adt7310_spi_ops);
90}
91
92static int adt7310_spi_remove(struct spi_device *spi)
93{
94 return adt7x10_remove(&spi->dev, spi->irq);
95}
96
97static const struct spi_device_id adt7310_id[] = {
98 { "adt7310", 0 },
99 { "adt7320", 0 },
100 {}
101};
102MODULE_DEVICE_TABLE(spi, adt7310_id);
103
104static struct spi_driver adt7310_driver = {
105 .driver = {
106 .name = "adt7310",
107 .owner = THIS_MODULE,
108 .pm = ADT7X10_DEV_PM_OPS,
109 },
110 .probe = adt7310_spi_probe,
111 .remove = adt7310_spi_remove,
112 .id_table = adt7310_id,
113};
114module_spi_driver(adt7310_driver);
115
116MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
117MODULE_DESCRIPTION("ADT7310/ADT7320 driver");
118MODULE_LICENSE("GPL");