max17135-hwmon.c
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/*
* Copyright (C) 2010-2015 Freescale Semiconductor, Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
/*
* max17135.c
*
* Based on the MAX1619 driver.
* Copyright (C) 2003-2004 Alexey Fisher <fishor@mail.ru>
* Jean Delvare <khali@linux-fr.org>
*
* The MAX17135 is a sensor chip made by Maxim.
* It reports up to two temperatures (its own plus up to
* one external one).
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/jiffies.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/err.h>
#include <linux/sysfs.h>
#include <linux/platform_device.h>
#include <linux/mfd/max17135.h>
/*
* Conversions
*/
static int temp_from_reg(int val)
{
return val >> 8;
}
/*
* Functions declaration
*/
static int max17135_sensor_probe(struct platform_device *pdev);
static int max17135_sensor_remove(struct platform_device *pdev);
static const struct platform_device_id max17135_sns_id[] = {
{ "max17135-sns", 0},
{ /* sentinel */ },
};
MODULE_DEVICE_TABLE(platform, max17135_sns_id);
/*
* Driver data (common to all clients)
*/
static struct platform_driver max17135_sensor_driver = {
.probe = max17135_sensor_probe,
.remove = max17135_sensor_remove,
.id_table = max17135_sns_id,
.driver = {
.name = "max17135_sensor",
},
};
/*
* Client data (each client gets its own)
*/
struct max17135_data {
struct device *hwmon_dev;
};
/*
* Sysfs stuff
*/
static ssize_t show_temp_input1(struct device *dev,
struct device_attribute *attr, char *buf)
{
unsigned int reg_val;
max17135_reg_read(REG_MAX17135_INT_TEMP, ®_val);
return snprintf(buf, PAGE_SIZE, "%d\n", temp_from_reg(reg_val));
}
static ssize_t show_temp_input2(struct device *dev,
struct device_attribute *attr, char *buf)
{
unsigned int reg_val;
max17135_reg_read(REG_MAX17135_EXT_TEMP, ®_val);
return snprintf(buf, PAGE_SIZE, "%d\n", temp_from_reg(reg_val));
}
static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp_input1, NULL);
static DEVICE_ATTR(temp2_input, S_IRUGO, show_temp_input2, NULL);
static struct attribute *max17135_attributes[] = {
&dev_attr_temp1_input.attr,
&dev_attr_temp2_input.attr,
NULL
};
static const struct attribute_group max17135_group = {
.attrs = max17135_attributes,
};
/*
* Real code
*/
static int max17135_sensor_probe(struct platform_device *pdev)
{
struct max17135_data *data;
int err;
data = kzalloc(sizeof(struct max17135_data), GFP_KERNEL);
if (!data) {
err = -ENOMEM;
goto exit;
}
/* Register sysfs hooks */
err = sysfs_create_group(&pdev->dev.kobj, &max17135_group);
if (err)
goto exit_free;
data->hwmon_dev = hwmon_device_register(&pdev->dev);
if (IS_ERR(data->hwmon_dev)) {
err = PTR_ERR(data->hwmon_dev);
goto exit_remove_files;
}
platform_set_drvdata(pdev, data);
return 0;
exit_remove_files:
sysfs_remove_group(&pdev->dev.kobj, &max17135_group);
exit_free:
kfree(data);
exit:
return err;
}
static int max17135_sensor_remove(struct platform_device *pdev)
{
struct max17135_data *data = platform_get_drvdata(pdev);
hwmon_device_unregister(data->hwmon_dev);
sysfs_remove_group(&pdev->dev.kobj, &max17135_group);
kfree(data);
return 0;
}
static int __init sensors_max17135_init(void)
{
return platform_driver_register(&max17135_sensor_driver);
}
module_init(sensors_max17135_init);
static void __exit sensors_max17135_exit(void)
{
platform_driver_unregister(&max17135_sensor_driver);
}
module_exit(sensors_max17135_exit);
MODULE_DESCRIPTION("MAX17135 sensor driver");
MODULE_LICENSE("GPL");