1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * ADT7310/ADT7310 digital temperature sensor driver
4 *
5 * Copyright 2012-2013 Analog Devices Inc.
6 * Author: Lars-Peter Clausen <lars@metafoo.de>
7 */
8
9 #include <linux/module.h>
10 #include <linux/init.h>
11 #include <linux/spi/spi.h>
12 #include <asm/unaligned.h>
13
14 #include "adt7x10.h"
15
16 #define ADT7310_STATUS 0
17 #define ADT7310_CONFIG 1
18 #define ADT7310_TEMPERATURE 2
19 #define ADT7310_ID 3
20 #define ADT7310_T_CRIT 4
21 #define ADT7310_T_HYST 5
22 #define ADT7310_T_ALARM_HIGH 6
23 #define ADT7310_T_ALARM_LOW 7
24
25 static const u8 adt7310_reg_table[] = {
26 [ADT7X10_TEMPERATURE] = ADT7310_TEMPERATURE,
27 [ADT7X10_STATUS] = ADT7310_STATUS,
28 [ADT7X10_CONFIG] = ADT7310_CONFIG,
29 [ADT7X10_T_ALARM_HIGH] = ADT7310_T_ALARM_HIGH,
30 [ADT7X10_T_ALARM_LOW] = ADT7310_T_ALARM_LOW,
31 [ADT7X10_T_CRIT] = ADT7310_T_CRIT,
32 [ADT7X10_T_HYST] = ADT7310_T_HYST,
33 [ADT7X10_ID] = ADT7310_ID,
34 };
35
36 #define ADT7310_CMD_REG_OFFSET 3
37 #define ADT7310_CMD_READ 0x40
38
39 #define AD7310_COMMAND(reg) (adt7310_reg_table[(reg)] << ADT7310_CMD_REG_OFFSET)
40
adt7310_spi_read_word(struct device * dev,u8 reg)41 static int adt7310_spi_read_word(struct device *dev, u8 reg)
42 {
43 struct spi_device *spi = to_spi_device(dev);
44
45 return spi_w8r16be(spi, AD7310_COMMAND(reg) | ADT7310_CMD_READ);
46 }
47
adt7310_spi_write_word(struct device * dev,u8 reg,u16 data)48 static int adt7310_spi_write_word(struct device *dev, u8 reg, u16 data)
49 {
50 struct spi_device *spi = to_spi_device(dev);
51 u8 buf[3];
52
53 buf[0] = AD7310_COMMAND(reg);
54 put_unaligned_be16(data, &buf[1]);
55
56 return spi_write(spi, buf, sizeof(buf));
57 }
58
adt7310_spi_read_byte(struct device * dev,u8 reg)59 static int adt7310_spi_read_byte(struct device *dev, u8 reg)
60 {
61 struct spi_device *spi = to_spi_device(dev);
62
63 return spi_w8r8(spi, AD7310_COMMAND(reg) | ADT7310_CMD_READ);
64 }
65
adt7310_spi_write_byte(struct device * dev,u8 reg,u8 data)66 static int adt7310_spi_write_byte(struct device *dev, u8 reg,
67 u8 data)
68 {
69 struct spi_device *spi = to_spi_device(dev);
70 u8 buf[2];
71
72 buf[0] = AD7310_COMMAND(reg);
73 buf[1] = data;
74
75 return spi_write(spi, buf, sizeof(buf));
76 }
77
78 static const struct adt7x10_ops adt7310_spi_ops = {
79 .read_word = adt7310_spi_read_word,
80 .write_word = adt7310_spi_write_word,
81 .read_byte = adt7310_spi_read_byte,
82 .write_byte = adt7310_spi_write_byte,
83 };
84
adt7310_spi_probe(struct spi_device * spi)85 static int adt7310_spi_probe(struct spi_device *spi)
86 {
87 return adt7x10_probe(&spi->dev, spi_get_device_id(spi)->name, spi->irq,
88 &adt7310_spi_ops);
89 }
90
adt7310_spi_remove(struct spi_device * spi)91 static int adt7310_spi_remove(struct spi_device *spi)
92 {
93 return adt7x10_remove(&spi->dev, spi->irq);
94 }
95
96 static const struct spi_device_id adt7310_id[] = {
97 { "adt7310", 0 },
98 { "adt7320", 0 },
99 {}
100 };
101 MODULE_DEVICE_TABLE(spi, adt7310_id);
102
103 static struct spi_driver adt7310_driver = {
104 .driver = {
105 .name = "adt7310",
106 .pm = ADT7X10_DEV_PM_OPS,
107 },
108 .probe = adt7310_spi_probe,
109 .remove = adt7310_spi_remove,
110 .id_table = adt7310_id,
111 };
112 module_spi_driver(adt7310_driver);
113
114 MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
115 MODULE_DESCRIPTION("ADT7310/ADT7320 driver");
116 MODULE_LICENSE("GPL");
117