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");