![Axel Lin](/assets/img/avatar_default.png)
This patch converts the drivers in drivers/hwmon/* to use the module_spi_driver() macro which makes the code smaller and a bit simpler. Signed-off-by: Axel Lin <axel.lin@gmail.com> Cc: Sonic Zhang <sonic.zhang@analog.com> Cc: Marc Pignat <marc.pignat@hevs.ch> Cc: Paul Thomas <pthomas8589@gmail.com> Cc: Eric Miao <eric.y.miao@gmail.com> Acked-by: Sonic Zhang <sonic.zhang@analog.com> Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
176 lines
3.7 KiB
C
176 lines
3.7 KiB
C
/*
|
|
* AD7314 digital temperature sensor driver for AD7314, ADT7301 and ADT7302
|
|
*
|
|
* Copyright 2010 Analog Devices Inc.
|
|
*
|
|
* Licensed under the GPL-2 or later.
|
|
*
|
|
* Conversion to hwmon from IIO done by Jonathan Cameron <jic23@cam.ac.uk>
|
|
*/
|
|
#include <linux/device.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/sysfs.h>
|
|
#include <linux/spi/spi.h>
|
|
#include <linux/module.h>
|
|
#include <linux/err.h>
|
|
#include <linux/hwmon.h>
|
|
#include <linux/hwmon-sysfs.h>
|
|
|
|
/*
|
|
* AD7314 power mode
|
|
*/
|
|
#define AD7314_PD 0x2000
|
|
|
|
/*
|
|
* AD7314 temperature masks
|
|
*/
|
|
#define AD7314_TEMP_SIGN 0x200
|
|
#define AD7314_TEMP_MASK 0x7FE0
|
|
#define AD7314_TEMP_OFFSET 5
|
|
|
|
/*
|
|
* ADT7301 and ADT7302 temperature masks
|
|
*/
|
|
#define ADT7301_TEMP_SIGN 0x2000
|
|
#define ADT7301_TEMP_MASK 0x3FFF
|
|
|
|
enum ad7314_variant {
|
|
adt7301,
|
|
adt7302,
|
|
ad7314,
|
|
};
|
|
|
|
struct ad7314_data {
|
|
struct spi_device *spi_dev;
|
|
struct device *hwmon_dev;
|
|
u16 rx ____cacheline_aligned;
|
|
};
|
|
|
|
static int ad7314_spi_read(struct ad7314_data *chip, s16 *data)
|
|
{
|
|
int ret;
|
|
|
|
ret = spi_read(chip->spi_dev, (u8 *)&chip->rx, sizeof(chip->rx));
|
|
if (ret < 0) {
|
|
dev_err(&chip->spi_dev->dev, "SPI read error\n");
|
|
return ret;
|
|
}
|
|
|
|
*data = be16_to_cpu(chip->rx);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static ssize_t ad7314_show_temperature(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct ad7314_data *chip = dev_get_drvdata(dev);
|
|
s16 data;
|
|
int ret;
|
|
|
|
ret = ad7314_spi_read(chip, &data);
|
|
if (ret < 0)
|
|
return ret;
|
|
switch (spi_get_device_id(chip->spi_dev)->driver_data) {
|
|
case ad7314:
|
|
data = (data & AD7314_TEMP_MASK) >> AD7314_TEMP_OFFSET;
|
|
data = (data << 6) >> 6;
|
|
|
|
return sprintf(buf, "%d\n", 250 * data);
|
|
case adt7301:
|
|
case adt7302:
|
|
/*
|
|
* Documented as a 13 bit twos complement register
|
|
* with a sign bit - which is a 14 bit 2's complement
|
|
* register. 1lsb - 31.25 milli degrees centigrade
|
|
*/
|
|
data &= ADT7301_TEMP_MASK;
|
|
data = (data << 2) >> 2;
|
|
|
|
return sprintf(buf, "%d\n",
|
|
DIV_ROUND_CLOSEST(data * 3125, 100));
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO,
|
|
ad7314_show_temperature, NULL, 0);
|
|
|
|
static struct attribute *ad7314_attributes[] = {
|
|
&sensor_dev_attr_temp1_input.dev_attr.attr,
|
|
NULL,
|
|
};
|
|
|
|
static const struct attribute_group ad7314_group = {
|
|
.attrs = ad7314_attributes,
|
|
};
|
|
|
|
static int __devinit ad7314_probe(struct spi_device *spi_dev)
|
|
{
|
|
int ret;
|
|
struct ad7314_data *chip;
|
|
|
|
chip = kzalloc(sizeof(*chip), GFP_KERNEL);
|
|
if (chip == NULL) {
|
|
ret = -ENOMEM;
|
|
goto error_ret;
|
|
}
|
|
dev_set_drvdata(&spi_dev->dev, chip);
|
|
|
|
ret = sysfs_create_group(&spi_dev->dev.kobj, &ad7314_group);
|
|
if (ret < 0)
|
|
goto error_free_chip;
|
|
chip->hwmon_dev = hwmon_device_register(&spi_dev->dev);
|
|
if (IS_ERR(chip->hwmon_dev)) {
|
|
ret = PTR_ERR(chip->hwmon_dev);
|
|
goto error_remove_group;
|
|
}
|
|
|
|
return 0;
|
|
error_remove_group:
|
|
sysfs_remove_group(&spi_dev->dev.kobj, &ad7314_group);
|
|
error_free_chip:
|
|
kfree(chip);
|
|
error_ret:
|
|
return ret;
|
|
}
|
|
|
|
static int __devexit ad7314_remove(struct spi_device *spi_dev)
|
|
{
|
|
struct ad7314_data *chip = dev_get_drvdata(&spi_dev->dev);
|
|
|
|
hwmon_device_unregister(chip->hwmon_dev);
|
|
sysfs_remove_group(&spi_dev->dev.kobj, &ad7314_group);
|
|
kfree(chip);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct spi_device_id ad7314_id[] = {
|
|
{ "adt7301", adt7301 },
|
|
{ "adt7302", adt7302 },
|
|
{ "ad7314", ad7314 },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(spi, ad7314_id);
|
|
|
|
static struct spi_driver ad7314_driver = {
|
|
.driver = {
|
|
.name = "ad7314",
|
|
.owner = THIS_MODULE,
|
|
},
|
|
.probe = ad7314_probe,
|
|
.remove = __devexit_p(ad7314_remove),
|
|
.id_table = ad7314_id,
|
|
};
|
|
|
|
module_spi_driver(ad7314_driver);
|
|
|
|
MODULE_AUTHOR("Sonic Zhang <sonic.zhang@analog.com>");
|
|
MODULE_DESCRIPTION("Analog Devices AD7314, ADT7301 and ADT7302 digital"
|
|
" temperature sensor driver");
|
|
MODULE_LICENSE("GPL v2");
|