mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-23 17:30:02 +00:00
![Jonathan Cameron](/assets/img/avatar_default.png)
These newer PM macros allow the compiler to see what code it can remove if !CONFIG_PM_SLEEP. This allows the removal of messy #ifdef barriers whilst achieving the same result. Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Cc: Lars-Peter Clausen <lars@metafoo.de> Link: https://lore.kernel.org/r/20220925172759.3573439-5-jic23@kernel.org Signed-off-by: Guenter Roeck <linux@roeck-us.net>
164 lines
3.7 KiB
C
164 lines
3.7 KiB
C
// 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 <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 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_RBTREE,
|
|
.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");
|