linux-kernel - Re: [PATCH] fujitsu-laptop: Support radio LED

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Date:	Wed, 23 Mar 2016 08:51:45 +0100
From:	Michał Kępień <kernel@...pniu.pl>
To:	Jonathan Woithe <jwoithe@...t42.net>
Cc:	Darren Hart <dvhart@...radead.org>,
	platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] fujitsu-laptop: Support radio LED

> > If you could let me know how you went about
> > acquiring the values on your machine I could try the exact same steps on the
> > S7020 to see what we get.
> 
> The BTNI value is printed to the kernel log buffer by
> acpi_fujitsu_hotkey_add(), so all it takes to retrieve it is:
> 
>     dmesg | grep BTNI
> 

I forgot to write that the other value I suggested could perhaps be used
to determine whether a radio toggle button is present on a given model
(0x00020320 on a Lifebook E744) is the return value of:

    call_fext_func(FUNC_RFKILL, 0x0, 0x0, 0x0);

It is stored in the rfkill_supported field of struct fujitsu_hotkey_t.
You can also look it up in a DSDT dump.  On a Lifebook E744:

    Method (S000, 3, Serialized)
    {
        Name (_T_0, Zero)  // _T_x: Emitted by ASL Compiler
        Local0 = Zero
        While (One)
        {
            _T_0 = Arg0
            If ((_T_0 == Zero))
            {
 >>             Local0 |= 0x00020000
                Local0 |= 0x0200
                Local0 |= 0x0100
                Local0 |= 0x20
            }
            ...
            Break
        }

        Return (Local0)
    }

On an E8420:

    Method (S000, 3, NotSerialized)
    {
        Local0 = 0x80000000
        If ((Arg0 == 0x00))
        {
            Local0 = Zero
            Local0 |= 0x20
            Local0 |= 0x0100
            Local0 |= 0x0200
        }
        ...
        Return (Local0)
    }

-- 
Best regards,
Michał Kępień