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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* ADT7310/ADT7310 digital temperature sensor driver
*
* Copyright 2012-2013 Analog Devices Inc.
* Author: Lars-Peter Clausen <lars@metafoo.de>
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/regmap.h>
#include <linux/spi/spi.h>
#include <linux/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 spi_device *spi, u8 reg)
{
return spi_w8r16be(spi, AD7310_COMMAND(reg) | ADT7310_CMD_READ);
}
static int adt7310_spi_write_word(struct spi_device *spi, u8 reg, u16 data)
{
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 spi_device *spi, u8 reg)
{
return spi_w8r8(spi, AD7310_COMMAND(reg) | ADT7310_CMD_READ);
}
static int adt7310_spi_write_byte(struct spi_device *spi, u8 reg, u8 data)
{
u8 buf[2];
buf[0] = AD7310_COMMAND(reg);
buf[1] = data;
return spi_write(spi, buf, sizeof(buf));
}
static bool adt7310_regmap_is_volatile(struct device *dev, unsigned int reg)
{
switch (reg) {
case ADT7X10_TEMPERATURE:
case ADT7X10_STATUS:
return true;
default:
return false;
}
}
static int adt7310_reg_read(void *context, unsigned int reg, unsigned int *val)
{
struct spi_device *spi = context;
int regval;
switch (reg) {
case ADT7X10_TEMPERATURE:
case ADT7X10_T_ALARM_HIGH:
case ADT7X10_T_ALARM_LOW:
case ADT7X10_T_CRIT:
regval = adt7310_spi_read_word(spi, reg);
break;
default:
regval = adt7310_spi_read_byte(spi, reg);
break;
}
if (regval < 0)
return regval;
*val = regval;
return 0;
}
static int adt7310_reg_write(void *context, unsigned int reg, unsigned int val)
{
struct spi_device *spi = context;
int ret;
switch (reg) {
case ADT7X10_TEMPERATURE:
case ADT7X10_T_ALARM_HIGH:
case ADT7X10_T_ALARM_LOW:
case ADT7X10_T_CRIT:
ret = adt7310_spi_write_word(spi, reg, val);
break;
default:
ret = adt7310_spi_write_byte(spi, reg, val);
break;
}
return ret;
}
static const struct regmap_config adt7310_regmap_config = {
.reg_bits = 8,
.val_bits = 16,
.cache_type = REGCACHE_MAPLE,
.volatile_reg = adt7310_regmap_is_volatile,
.reg_read = adt7310_reg_read,
.reg_write = adt7310_reg_write,
};
static int adt7310_spi_probe(struct spi_device *spi)
{
struct regmap *regmap;
regmap = devm_regmap_init(&spi->dev, NULL, spi, &adt7310_regmap_config);
if (IS_ERR(regmap))
return PTR_ERR(regmap);
return adt7x10_probe(&spi->dev, spi_get_device_id(spi)->name, spi->irq,
regmap);
}
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 = pm_sleep_ptr(&adt7x10_dev_pm_ops),
},
.probe = adt7310_spi_probe,
.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");
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