Merge tag 'ceph-for-4.10-rc1' of git://github.com/ceph/ceph-client
[linux-2.6-block.git] / drivers / hwmon / adt7310.c
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
42 static 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
49 static 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
60 static 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
67 static 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
79 static 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
86 static 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
92 static int adt7310_spi_remove(struct spi_device *spi)
93 {
94         return adt7x10_remove(&spi->dev, spi->irq);
95 }
96
97 static const struct spi_device_id adt7310_id[] = {
98         { "adt7310", 0 },
99         { "adt7320", 0 },
100         {}
101 };
102 MODULE_DEVICE_TABLE(spi, adt7310_id);
103
104 static struct spi_driver adt7310_driver = {
105         .driver = {
106                 .name   = "adt7310",
107                 .pm     = ADT7X10_DEV_PM_OPS,
108         },
109         .probe          = adt7310_spi_probe,
110         .remove         = adt7310_spi_remove,
111         .id_table       = adt7310_id,
112 };
113 module_spi_driver(adt7310_driver);
114
115 MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
116 MODULE_DESCRIPTION("ADT7310/ADT7320 driver");
117 MODULE_LICENSE("GPL");