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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 | 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 | |
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 | |
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 | |
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 | |
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 | |
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 |
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