[PATCH] I2C hwmon: hwmon sysfs class

This patch adds the sysfs class "hwmon" for use by hardware monitoring
(sensors) chip drivers.  It also fixes up the related Kconfig/Makefile
bits.

Signed-off-by: Mark M. Hoffman <mhoffman@lightlink.com>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Mark M. Hoffman 2005-07-15 21:38:08 -04:00 committed by Greg Kroah-Hartman
parent 8dd2d2ca7f
commit 1236441f38
4 changed files with 130 additions and 1 deletions

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@ -12,7 +12,12 @@ config HWMON
of a system. Most modern motherboards include such a device. It
can include temperature sensors, voltage sensors, fan speed
sensors and various additional features such as the ability to
control the speed of the fans.
control the speed of the fans. If you want this support you
should say Y here and also to the specific driver(s) for your
sensors chip(s) below.
This support can also be built as a module. If so, the module
will be called hwmon.
config SENSORS_ADM1021
tristate "Analog Devices ADM1021 and compatibles"

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@ -2,6 +2,8 @@
# Makefile for sensor chip drivers.
#
obj-$(CONFIG_HWMON) += hwmon.o
# asb100, then w83781d go first, as they can override other drivers' addresses.
obj-$(CONFIG_SENSORS_ASB100) += asb100.o
obj-$(CONFIG_SENSORS_W83627HF) += w83627hf.o

98
drivers/hwmon/hwmon.c Normal file
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@ -0,0 +1,98 @@
/*
hwmon.c - part of lm_sensors, Linux kernel modules for hardware monitoring
This file defines the sysfs class "hwmon", for use by sensors drivers.
Copyright (C) 2005 Mark M. Hoffman <mhoffman@lightlink.com>
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; version 2 of the License.
*/
#include <linux/module.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/kdev_t.h>
#include <linux/idr.h>
#include <linux/hwmon.h>
#define HWMON_ID_PREFIX "hwmon"
#define HWMON_ID_FORMAT HWMON_ID_PREFIX "%d"
static struct class *hwmon_class;
static DEFINE_IDR(hwmon_idr);
/**
* hwmon_device_register - register w/ hwmon sysfs class
* @dev: the device to register
*
* hwmon_device_unregister() must be called when the class device is no
* longer needed.
*
* Returns the pointer to the new struct class device.
*/
struct class_device *hwmon_device_register(struct device *dev)
{
struct class_device *cdev;
int id;
if (idr_pre_get(&hwmon_idr, GFP_KERNEL) == 0)
return ERR_PTR(-ENOMEM);
if (idr_get_new(&hwmon_idr, NULL, &id) < 0)
return ERR_PTR(-ENOMEM);
id = id & MAX_ID_MASK;
cdev = class_device_create(hwmon_class, MKDEV(0,0), dev,
HWMON_ID_FORMAT, id);
if (IS_ERR(cdev))
idr_remove(&hwmon_idr, id);
return cdev;
}
/**
* hwmon_device_unregister - removes the previously registered class device
*
* @cdev: the class device to destroy
*/
void hwmon_device_unregister(struct class_device *cdev)
{
int id;
if (sscanf(cdev->class_id, HWMON_ID_FORMAT, &id) == 1) {
class_device_unregister(cdev);
idr_remove(&hwmon_idr, id);
} else
dev_dbg(cdev->dev,
"hwmon_device_unregister() failed: bad class ID!\n");
}
static int __init hwmon_init(void)
{
hwmon_class = class_create(THIS_MODULE, "hwmon");
if (IS_ERR(hwmon_class)) {
printk(KERN_ERR "hwmon.c: couldn't create sysfs class\n");
return PTR_ERR(hwmon_class);
}
return 0;
}
static void __exit hwmon_exit(void)
{
class_destroy(hwmon_class);
}
module_init(hwmon_init);
module_exit(hwmon_exit);
EXPORT_SYMBOL_GPL(hwmon_device_register);
EXPORT_SYMBOL_GPL(hwmon_device_unregister);
MODULE_AUTHOR("Mark M. Hoffman <mhoffman@lightlink.com>");
MODULE_DESCRIPTION("hardware monitoring sysfs/class support");
MODULE_LICENSE("GPL");

24
include/linux/hwmon.h Normal file
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@ -0,0 +1,24 @@
/*
hwmon.h - part of lm_sensors, Linux kernel modules for hardware monitoring
This file declares helper functions for the sysfs class "hwmon",
for use by sensors drivers.
Copyright (C) 2005 Mark M. Hoffman <mhoffman@lightlink.com>
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; version 2 of the License.
*/
#ifndef _HWMON_H_
#define _HWMON_H_
#include <linux/device.h>
struct class_device *hwmon_device_register(struct device *dev);
void hwmon_device_unregister(struct class_device *cdev);
#endif