Re: [PATCH v2 1/3] platform: x86: dell-rbtn: Dell Airplane Mode Switch driver
From: Gabriele Mazzotta
Date: Wed Apr 29 2015 - 09:58:09 EST
On Wednesday 29 April 2015 15:08:40 Pali Rohár wrote:
> On Wednesday 29 April 2015 12:30:32 Gabriele Mazzotta wrote:
> > On Wednesday 29 April 2015 11:51:04 Pali Rohár wrote:
> > > This is an ACPI driver for Dell laptops which receive HW switch events.
> > > It exports rfkill device dell-rbtn which provide correct hard rfkill state.
> > >
> > > Alex Hung added code for supporting Dell laptops which have toggle button
> > > instead HW slider switch. On these laptops toggle button event is reported
> > > by new input device (instead rfkill) as they do not have hw radio switch.
> > >
> > > It looks like those are two different functions (rfkill, input device), but
> > > Dell BIOS exports them via same ACPI device and uses same ACPI functions.
> > > So code is in one kernel driver.
> > I made a patch some time ago that I've just adapted. It allows to
> > prefer RBTN_SLIDER over RBTN_TOGGLE. The main reason why I'd like to
> > have the hardware switch is that the BIOS doesn't alter the soft state
> > of the devices. This comes in handy when the function key controls
> > multiple radio devices.
> Now I'm thinking... is't this bug in wifi kernel driver (which exports
> phy rfkill)? Or problem somewhere else (userspace or kernel)?
What is the presumed bug you are referring to? The fact that the soft state
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