Hi there,
In power management group, we have a working item of exposing thermal
information to user space through sysfs. However, so far, the thermal
sensor drivers under 'drivers/hwmon' expose their information in
various nodes under sysfs, which makes information collection
difficult.
Intel's thermal framework is located under 'drivers/thermal', but all
the thermal drivers under hwmon don't make use of it due to some
reason (part of the reason for this situation may be that intel's
thermal framework is comparatively new therefore when those sensor
drivers were implemented they did not have a framework to register
themselves.)
We like to find out a simple and unified way to expose thermal related
information, intel's thermal interface could be a choice. Using
thermal framework is straightforward, below is a sample driver for
this purpose. Thus all the information goes to /sys/class/thermal,
like temperature, mode...
...
#include <linux/module.h>
#include <linux/device.h>
#include <linux/thermal.h>
#include <linux/hwmon.h>
static int thermal_get_temp(struct thermal_zone_device *thermal,
unsigned long *temp)
{
*temp = xxx;
return 0;
}
static struct device *hwmon;
static struct thermal_zone_device *thermal;
static struct thermal_zone_device_ops ops = {
.get_temp = thermal_get_temp,
};
static int __init sensor_init(void)
{
...
thermal = thermal_zone_device_register("sample", 0, 0,
&ops, 0, 0, 0, 0);
}
static void __exit sensor_cleanup(void)
{
...
}
module_init(sensor_init);
module_exit(sensor_cleanup);
Are there any better ideas about this? Your comments are highly appreciated.
Yong
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