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
25static 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
41static 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
48static 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
59static 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
66static 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
78static 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
85static 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
91static int adt7310_spi_remove(struct spi_device *spi)
92{
93	return adt7x10_remove(&spi->dev, spi->irq);
94}
95
96static const struct spi_device_id adt7310_id[] = {
97	{ "adt7310", 0 },
98	{ "adt7320", 0 },
99	{}
100};
101MODULE_DEVICE_TABLE(spi, adt7310_id);
102
103static 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};
112module_spi_driver(adt7310_driver);
113
114MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
115MODULE_DESCRIPTION("ADT7310/ADT7320 driver");
116MODULE_LICENSE("GPL");
117