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SubjectRe: [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@linux.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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