1236441f38
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>
99 lines
2.3 KiB
C
99 lines
2.3 KiB
C
/*
|
|
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");
|
|
|