linux-kernel - RE: How to use the generic thermal sysfs.

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Date:	Thu, 12 Jul 2012 10:54:01 +0000
From:	"R, Durgadoss" <durgadoss.r@...el.com>
To:	Wei Ni <wni@...dia.com>, "Zhang, Rui" <rui.zhang@...el.com>,
	"Brown, Len" <len.brown@...el.com>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"khali@...ux-fr.org" <khali@...ux-fr.org>,
	"joe@...ches.com" <joe@...ches.com>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-tegra@....kernel.org" <linux-tegra@....kernel.org>,
	"acourbot@...dia.com" <acourbot@...dia.com>
Subject: RE: How to use the generic thermal sysfs.

Hi,

> -----Original Message-----
> From: Wei Ni [mailto:wni@...dia.com]
> Sent: Thursday, July 12, 2012 3:53 PM
> To: Zhang, Rui; Brown, Len; akpm@...ux-foundation.org; khali@...ux-fr.org;
> joe@...ches.com; R, Durgadoss
> Cc: linux-kernel@...r.kernel.org; linux-tegra@....kernel.org;
> acourbot@...dia.com
> Subject: How to use the generic thermal sysfs.
> 
> Hi, all
> I'm working on the tegra thermal throttling upstream issue.
> The tegra30 board use the nct1008 as the thermal sensor, and the lm90 is
> the sensor driver. We want to use the generic thermal sysfs.
> 
> My question is where should we register the thermal zone device? We may
> have two place to do it:
> 1. register it in the sensor driver, such as lm90.c
> In this way, the sensor driver doesn't need to export any APIs, such as
> get_temp.

This approach is preferred.

> 2. register in my tegra thermal framework.
> In this way, the sensor driver need to export some APIs, which are used
> to register the ops and do any other things.

What do you mean by "my tegra thermal framework" ? Where does the source
file for this sit in the mainline kernel ?

> 
> How should I do it?
> 
> And in current codes, there have the event notification, in the form of
> a netlink event. But it's difficult to be used in the kernel, it's
> normally for the communication with user-space. How about to add a
> notify call chain for it? So when the sensor has irq alert, it can send
> a notify to my thermal framework in kernel.

We are working on a notification API from any generic sensor driver to
the thermal framework.
Please have a look at the 'notify_thermal_framework' API in the patch here:
http://www.spinics.net/lists/linux-acpi/msg36049.html

Thanks,
Durga