linux-kernel - Re: [PATCH 2.6.23-rc2] hwmon: HP Mobile Data Protection System 3D ACPI driver (resend)

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Message-ID: <20070827082845.GI2060@elf.ucw.cz>
Date:	Mon, 27 Aug 2007 10:28:45 +0200
From:	Pavel Machek <pavel@....cz>
To:	Yan Burman <burman.yan@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2.6.23-rc2]  hwmon: HP Mobile Data Protection System 3D ACPI driver (resend)

On Sat 2007-08-25 13:36:00, Yan Burman wrote:
> Pavel Machek wrote:
> >On Sat 2007-08-11 14:26:02, Yan Burman wrote:
> >  
> >>HP Mobile Data Protection System 3D ACPI driver. Similar to hdaps in 
> >>functionality.
> >>This driver provides 4 kinds of functionality:
> >>1) Creates a misc device /dev/accel that acts similar to /dev/rtc and 
> >>unblocks
> >>the process reading from it when the device detects free-fall interrupt
> >>2) Functions as an input class device to provide similar functionality to
> >>hdaps, in order to be able to use the laptop as a joystick
> >>3) Provides an interface similar to hdaps, so that hdapsd could work with 
> >>it
> >>4) Makes it possible to power the device off.
> >>    
> >
> >I assume this means 'power the sensor down'? What is interface for
> >that?
> >
> >Aha, /sys. Could we simply power off the device when its input device
> >is not opened?
> >
> >  
> No, we can't since the sys interface provides the position info and some 
> applications (hdaps apps for example) use this interface.

One more reason not to use /sys to access the position data.

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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