linux-kernel - Re: [lm-sensors] coretemp.0 folder contents changed

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Date:	Tue, 06 May 2014 08:20:22 -0700
From:	Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
To:	Jean Delvare <jdelvare@...e.de>
CC:	Guenter Roeck <linux@...ck-us.net>,
	"Yu, Fenghua" <fenghua.yu@...el.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	lm-sensors@...sensors.org
Subject: Re: [lm-sensors] coretemp.0 folder contents changed

On 05/06/2014 04:55 AM, Jean Delvare wrote:
> Hi Guenter, Srinivas,
>
> On Mon, 5 May 2014 10:32:31 -0700, Guenter Roeck wrote:
>> On Mon, May 05, 2014 at 10:13:11AM -0700, Srinivas Pandruvada wrote:
>>> for kernel : 3.15.rc3 .
>>>
>>> Is there any change in the coretemp? Previously we used to see,
>>> tempx data (like temp2_input, temp2_max etc.)
>>> /sys/devices/platform/coretemp.0/.
>> That isn't where you are supposed to look for hwmon attributes.
> Actually I used to recommend looking there when people were not using
> libsensors (e.g. for pwmconfig / fancontrol or custom scripts.) This
> path had the great merit of being stable across reboots, while hwmon
> class device numbers are not (or at least they aren't guaranteed to be.)
I maintain thermal daemon, which was using the path. So once Ubuntu 
upgrade kernel,
this will break. So I have to make sure that corresponding user space 
change is submitted.
I don't want to depend on too many libraries as it also runs on many 
embedded platforms
where many library pre-builts don't exists.
>> (...)
>> To give you the background, hwmon attributes are in the process of
>> being moved from the parent device to the hwmon device, or from
>> /sys/class/hwmon/hwmonX/device/ to /sys/class/hwmon/hwmonX/,
>> as part of an effort to streamline the code and make it more
>> consistent and maintainable.
> I am just realizing that we are also losing the stability of hardware
> device based paths with that move :( I suppose I shouldn't have
> bothered adding support for this to fancontrol.
>
> Don't get me wrong, I still believe this is the right move, but I fear
> that the question of persistent hwmon device names will resurface every
> now and then again. libsensors offers a solution but 1* it lacks
> support for pwm attributes and 2* it doesn't help with shell or perl
> scripts such as pwmconfig and fancontrol.
Also when using Android like platform with limited library support,
we have to make sure that libsensor exists.


Thanks,
Srinivas

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