linux-kernel - Re: [PATCH] platform-driver-x86: ACPI EC Extra driver for Oaktrail

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Message-Id: <4D2642F40200002300026856@novprvlin0050.provo.novell.com>
Date:	Thu, 06 Jan 2011 04:32:20 -0700
From:	"Joey Lee" <jlee@...ell.com>
To:	<kangkai.yin@...ux.intel.com>
Cc:	<corentin.chary@...il.com>, <bing.wei.liu@...el.com>,
	<yong.y.wang@...el.com>, "Gary Lin" <GLin@...ell.com>,
	<mjg@...hat.com>, <linux-kernel@...r.kernel.org>,
	<platform-driver-x86@...r.kernel.org>
Subject: Re: [PATCH] platform-driver-x86: ACPI EC Extra driver for
 Oaktrail

Hi Yin Kangkai, 

於 四，2011-01-06 於 11:54 +0100，Corentin Chary 提到：
> On Thu, Jan 6, 2011 at 11:50 AM, Yin Kangkai
> <kangkai.yin@...ux.intel.com> wrote:
> > On 2011-01-06, 08:29 +0100, Corentin Chary wrote:
> >> > + * gps - GPS subsystem enabled: contains either 0 or 1. (rw)
> >> > + * wifi - WiFi subsystem enabled: contains either 0 or 1. (rw)
> >> > + * wwan - WWAN (3G) subsystem enabled: contains either 0 or 1. (rw)
> >>
> >> Is there a reason do add these files in /sys/devices/platform while the
> >> functionality is already provided by rfkill ?
> >
> > This is not the same functionality.
> >
> > enable/disable using files in /sys/devices/platform will completely
> > cut power of those components. For example, if disabled, you can not
> > list out those components using lsusb. Can we achieve this using
> > rfkill?
> >
> 
> oh, sorry then, I didn't understood that.
> 
> So, you're lucky, you can control both the device and the radio. I'm
> not sure what's
> the best thing to do here, you can probably keep these files here.
> 
> CCing Matthew, he may have something to say about that.
> 
> 

We should used rfkill to provide interface to userland for
enable/disable wlan/bluetooth/wwan. You can set the killswitch state to
soft block when your driver call EC function to disable devices.

Udev/HAL will forward the killswitch change event to userland, then
userland application can do some response, e.g. show up OSD.
And, userland app also can control killswitch by /dev/rfkill.

There also have a urfkill daemon to provide DBus to userland app for
control killswitch:
 http://freedesktop.org/wiki/Software/urfkill

Use rfkill interface is more standard then create special sysfs file
in /sys/devices/platform/intel_oaktrail. 


Thank's a lot!
Joey Lee


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