118 lines
2.8 KiB
C
118 lines
2.8 KiB
C
|
/*
|
||
|
|
* ADT7310/ADT7310 digital temperature sensor driver
|
||
|
|
*
|
||
|
|
* Copyright 2012-2013 Analog Devices Inc.
|
||
|
|
* Author: Lars-Peter Clausen <lars@metafoo.de>
|
||
|
|
*
|
||
|
|
* Licensed under the GPL-2 or later.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <linux/module.h>
|
||
|
|
#include <linux/init.h>
|
||
|
|
#include <linux/spi/spi.h>
|
||
|
|
#include <asm/unaligned.h>
|
||
|
|
|
||
|
|
#include "adt7x10.h"
|
||
|
|
|
||
|
|
#define ADT7310_STATUS 0
|
||
|
|
#define ADT7310_CONFIG 1
|
||
|
|
#define ADT7310_TEMPERATURE 2
|
||
|
|
#define ADT7310_ID 3
|
||
|
|
#define ADT7310_T_CRIT 4
|
||
|
|
#define ADT7310_T_HYST 5
|
||
|
|
#define ADT7310_T_ALARM_HIGH 6
|
||
|
|
#define ADT7310_T_ALARM_LOW 7
|
||
|
|
|
||
|
|
static const u8 adt7310_reg_table[] = {
|
||
|
|
[ADT7X10_TEMPERATURE] = ADT7310_TEMPERATURE,
|
||
|
|
[ADT7X10_STATUS] = ADT7310_STATUS,
|
||
|
|
[ADT7X10_CONFIG] = ADT7310_CONFIG,
|
||
|
|
[ADT7X10_T_ALARM_HIGH] = ADT7310_T_ALARM_HIGH,
|
||
|
|
[ADT7X10_T_ALARM_LOW] = ADT7310_T_ALARM_LOW,
|
||
|
|
[ADT7X10_T_CRIT] = ADT7310_T_CRIT,
|
||
|
|
[ADT7X10_T_HYST] = ADT7310_T_HYST,
|
||
|
|
[ADT7X10_ID] = ADT7310_ID,
|
||
|
|
};
|
||
|
|
|
||
|
|
#define ADT7310_CMD_REG_OFFSET 3
|
||
|
|
#define ADT7310_CMD_READ 0x40
|
||
|
|
|
||
|
|
#define AD7310_COMMAND(reg) (adt7310_reg_table[(reg)] << ADT7310_CMD_REG_OFFSET)
|
||
|
|
|
||
|
|
static int adt7310_spi_read_word(struct device *dev, u8 reg)
|
||
|
|
{
|
||
|
|
struct spi_device *spi = to_spi_device(dev);
|
||
|
|
|
||
|
|
return spi_w8r16be(spi, AD7310_COMMAND(reg) | ADT7310_CMD_READ);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int adt7310_spi_write_word(struct device *dev, u8 reg, u16 data)
|
||
|
|
{
|
||
|
|
struct spi_device *spi = to_spi_device(dev);
|
||
|
|
u8 buf[3];
|
||
|
|
|
||
|
|
buf[0] = AD7310_COMMAND(reg);
|
||
|
|
put_unaligned_be16(data, &buf[1]);
|
||
|
|
|
||
|
|
return spi_write(spi, buf, sizeof(buf));
|
||
|
|
}
|
||
|
|
|
||
|
|
static int adt7310_spi_read_byte(struct device *dev, u8 reg)
|
||
|
|
{
|
||
|
|
struct spi_device *spi = to_spi_device(dev);
|
||
|
|
|
||
|
|
return spi_w8r8(spi, AD7310_COMMAND(reg) | ADT7310_CMD_READ);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int adt7310_spi_write_byte(struct device *dev, u8 reg,
|
||
|
|
u8 data)
|
||
|
|
{
|
||
|
|
struct spi_device *spi = to_spi_device(dev);
|
||
|
|
u8 buf[2];
|
||
|
|
|
||
|
|
buf[0] = AD7310_COMMAND(reg);
|
||
|
|
buf[1] = data;
|
||
|
|
|
||
|
|
return spi_write(spi, buf, sizeof(buf));
|
||
|
|
}
|
||
|
|
|
||
|
|
static const struct adt7x10_ops adt7310_spi_ops = {
|
||
|
|
.read_word = adt7310_spi_read_word,
|
||
|
|
.write_word = adt7310_spi_write_word,
|
||
|
|
.read_byte = adt7310_spi_read_byte,
|
||
|
|
.write_byte = adt7310_spi_write_byte,
|
||
|
|
};
|
||
|
|
|
||
|
|
static int adt7310_spi_probe(struct spi_device *spi)
|
||
|
|
{
|
||
|
|
return adt7x10_probe(&spi->dev, spi_get_device_id(spi)->name, spi->irq,
|
||
|
|
&adt7310_spi_ops);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int adt7310_spi_remove(struct spi_device *spi)
|
||
|
|
{
|
||
|
|
return adt7x10_remove(&spi->dev, spi->irq);
|
||
|
|
}
|
||
|
|
|
||
|
|
static const struct spi_device_id adt7310_id[] = {
|
||
|
|
{ "adt7310", 0 },
|
||
|
|
{ "adt7320", 0 },
|
||
|
|
{}
|
||
|
|
};
|
||
|
|
MODULE_DEVICE_TABLE(spi, adt7310_id);
|
||
|
|
|
||
|
|
static struct spi_driver adt7310_driver = {
|
||
|
|
.driver = {
|
||
|
|
.name = "adt7310",
|
||
|
|
.pm = ADT7X10_DEV_PM_OPS,
|
||
|
|
},
|
||
|
|
.probe = adt7310_spi_probe,
|
||
|
|
.remove = adt7310_spi_remove,
|
||
|
|
.id_table = adt7310_id,
|
||
|
|
};
|
||
|
|
module_spi_driver(adt7310_driver);
|
||
|
|
|
||
|
|
MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
|
||
|
|
MODULE_DESCRIPTION("ADT7310/ADT7320 driver");
|
||
|
|
MODULE_LICENSE("GPL");
|