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

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Message-ID: <1343782972.1682.489.camel@rui.sh.intel.com>
Date:	Wed, 01 Aug 2012 09:02:52 +0800
From:	Zhang Rui <rui.zhang@...el.com>
To:	Wei Ni <wni@...dia.com>
Cc:	Jean Delvare <khali@...ux-fr.org>,
	"R, Durgadoss" <durgadoss.r@...el.com>,
	"Brown, Len" <len.brown@...el.com>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"joe@...ches.com" <joe@...ches.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-tegra@....kernel.org" <linux-tegra@....kernel.org>,
	Alex Courbot <acourbot@...dia.com>
Subject: Re: How to use the generic thermal sysfs.

On 五, 2012-07-27 at 18:48 +0800, Wei Ni wrote:
> On Fri, 2012-07-27 at 15:39 +0800, Zhang Rui wrote:
> > On 五, 2012-07-27 at 09:30 +0200, Jean Delvare wrote:
> > > On Fri, 27 Jul 2012 10:58:21 +0800, Wei Ni wrote:
> > > > On Fri, 2012-07-27 at 09:21 +0800, Zhang Rui wrote:
> > > > > is it possible to program the sensor at this time, in your own thermal
> > > > > driver?
> > > > 
> > > > Since we are using the generic thermal driver lm90.c, I'm not sure if we
> > > > could program these limits in the generic driver, I think it's better to
> > > > have a generic interface to set the limits, so I wish to add a
> > > > callback .set_limits() in the generic thermal framework.
> > > 
> > > I can confirm that hwmon drivers do not set limits, it is up to
> > > user-space to do it if they want. So if there is a need to do so in the
> > > kernel itself, a proper interface at the generic thermal framework
> > > level seems appropriate.
> > > 
> > oh, setting limits from userspace?
> > I think you can program the senor when writing the trip point?
> > with this patch,
> > http://marc.info/?l=linux-acpi&m=134318814620429&w=2
> 
> Do you mean it can use .set_trip_temp() to set limits when writing the
> trip point? But I think this callback is used to change the trip_temp,
> it could not used to set the limits, in here the limit value is used to
> trigger the interrupt.
> 
yes, you are right. .set_trip_temp does not work.

usually, this is needed to re-program the sensor when the temperature
hits a trip point , right?

can we make use of the thermal_zone_device_ops.notify()?
say we invoke .notify() in thermal_zone_device_update for each trip
point.

thanks,
rui
> > 
> > thanks,
> > rui
> > 
> > 
> 
> 


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