On Tue, Jun 28, 2016 at 08:49:22PM +0930, Jonathan Woithe wrote:
> On Tue, Jun 28, 2016 at 09:25:50AM +0200, Micha?? K??pie?? wrote:
> > Haswell-based Fujitsu laptops (Lifebook E734/E744/E754) have a touchpad
> > toggle hotkey (Fn+F4) which is handled transparently to the operating
> > system: while an ACPI notification is sent to FUJ02B1 when Fn+F4 is
> > pressed, touchpad state is properly toggled without any explicit support
> > for this operation in fujitsu-laptop.
> >
> > Skylake-based models (Lifebook E736/E746/E756) also have that hotkey,
> > but the touchpad is not toggled transparently to the operating system.
> > When Fn+F4 is pressed, an ACPI notification is sent to FUJ02E3. A
> > subsequent call to S000 (FUNC_RFKILL) can be used to determine whether
> > the touchpad toggle hotkey was pressed so that an input event can be
> > sent to userspace.
> >
> > Relevant ACPI code:
> >
> > Method (_L21, 0, NotSerialized)
> > {
> > ...
> > If (AHKF)
> > {
> > Notify (\_SB.FEXT, 0x80)
> > }
> > ...
> > }
> >
> > Method (S000, 3, Serialized)
> > {
> > Name (_T_0, Zero)
> > Local0 = Zero
> > While (One)
> > {
> > _T_0 = Arg0
> > If (_T_0 == Zero)
> > {
> > Local0 |= 0x04000000
> > Local0 |= 0x02000000
> > Local0 |= 0x00020000
> > Local0 |= 0x0200
> > Local0 |= 0x0100
> > Local0 |= 0x20
> > }
> > ElseIf (_T_0 == One)
> > {
> > ...
> > If (AHKF & 0x08)
> > {
> > Local0 |= 0x04000000
> > AHKF ^= 0x08
> > }
> > ...
> > } ...
> > Break
> > }
> > Return (Local0)
> > }
> >
> > Pressing Fn+F4 raises GPE 0x21 and sets bit 3 in AHKF. This in turn
> > results in bit 26 being set in the value returned by FUNC_RFKILL called
> > with 1 as its first argument. On Skylake-based models, bit 26 is also
> > set in the value returned by FUNC_RFKILL called with 0 as its first
> > argument (this value is saved in fujitsu_hotkey->rfkill_supported upon
> > module initialization), which suggests that this bit is set on models
> > which do not handle touchpad toggling transparently to the operating
> > system.
> >
> > Note that bit 3 is cleared in AHKF once FUNC_RFKILL is called with 1 as
> > its first argument, which requires fujitsu-laptop to handle this hotkey
> > in a different manner than the other, GIRB-based hotkeys: two input
> > events (press and release) are immediately sent once Fn+F4 is pressed.
> >
> > Reported-and-tested-by: Jan-Marek Glogowski <glogow@xxxxxxxxxx>
> > Signed-off-by: Micha?? K??pie?? <kernel@xxxxxxxxxx>
>
> Thanks for the revision and your patience.
>
> Acked-by: Jonathan Woithe <jwoithe@xxxxxxxxxx>
Queued to testing for 4.8, thanks.
--
Darren Hart
Intel Open Source Technology Center
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