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
26 static 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
adt7310_spi_read_word(struct device * dev,u8 reg)42 static 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
51 return be16_to_cpu((__force __be16)ret);
52 }
53
adt7310_spi_write_word(struct device * dev,u8 reg,u16 data)54 static 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
adt7310_spi_read_byte(struct device * dev,u8 reg)65 static 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
adt7310_spi_write_byte(struct device * dev,u8 reg,u8 data)72 static 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
84 static 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
adt7310_spi_probe(struct spi_device * spi)91 static int adt7310_spi_probe(struct spi_device *spi)
92 {
93 return adt7x10_probe(&spi->dev, spi_get_device_id(spi)->name, spi->irq,
94 &adt7310_spi_ops);
95 }
96
adt7310_spi_remove(struct spi_device * spi)97 static int adt7310_spi_remove(struct spi_device *spi)
98 {
99 return adt7x10_remove(&spi->dev, spi->irq);
100 }
101
102 static const struct spi_device_id adt7310_id[] = {
103 { "adt7310", 0 },
104 { "adt7320", 0 },
105 {}
106 };
107 MODULE_DEVICE_TABLE(spi, adt7310_id);
108
109 static 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 };
119 module_spi_driver(adt7310_driver);
120
121 MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
122 MODULE_DESCRIPTION("ADT7310/ADT7320 driver");
123 MODULE_LICENSE("GPL");
124