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51c2a487 LPC |
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); | |
51c2a487 | 45 | |
600ba98b | 46 | return spi_w8r16be(spi, AD7310_COMMAND(reg) | ADT7310_CMD_READ); |
51c2a487 LPC |
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 | { | |
4b5e536b | 88 | return adt7x10_probe(&spi->dev, spi_get_device_id(spi)->name, spi->irq, |
51c2a487 LPC |
89 | &adt7310_spi_ops); |
90 | } | |
91 | ||
92 | static int adt7310_spi_remove(struct spi_device *spi) | |
93 | { | |
4b5e536b | 94 | return adt7x10_remove(&spi->dev, spi->irq); |
51c2a487 LPC |
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 | .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 | }; | |
114 | module_spi_driver(adt7310_driver); | |
115 | ||
116 | MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>"); | |
117 | MODULE_DESCRIPTION("ADT7310/ADT7320 driver"); | |
118 | MODULE_LICENSE("GPL"); |