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Date:   Tue, 27 Dec 2016 17:41:31 -0500
To:     Andy Shevchenko <>
Cc:     Pali Rohár <>,
        Wolfram Sang <>,
        Jean Delvare <>,
        Steven Honeyman <>,
        Jochen Eisinger <>,
        Gabriele Mazzotta <>,
        Andy Lutomirski <>,
        Mario Limonciello <>,
        Alex Hung <>,
        Michał Kępień 
        <>, Takashi Iwai <>,,
        "" <>,
Subject: Re: [PATCH] i2c: i801: Register optional lis3lv02d i2c device on Dell machines

On Wed, 28 Dec 2016 00:15:30 +0200, Andy Shevchenko said:
> On Tue, Dec 27, 2016 at 3:51 PM, Pali Rohár <> wrote:

> > I have no idea how to do it (properly) outside of i2c-i801.c file.
> I doubt we need a single line of code for this. See [1] and perhaps
> create an EFI variable with necessary upgrade device node.
> > Same thing is done for Fujitsu machines, see function
> > i801_probe_optional_slaves() in i2c-i801.c file. So I did similar
> > approach for Dell machines.
> Perhaps, this also needs to be converted to use EFI variable.
> [1]

There's no guarantee that the laptops in question are booted with UEFI,
as Dell still supports legacy boot. So assuming the presence of EFI variables
is somewhat problematic.

In addition, it requires the user (or something in userspace) to set the UEFI
variable or configfs tweak, rather than Just Working Out Of The Box.

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