linux-kernel - Re: [PATCH] i2c: i801: Register optional lis3lv02d i2c device on Dell machines

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Date:   Wed, 28 Dec 2016 15:02:52 +0100
From:   Wolfram Sang <wsa@...-dreams.de>
To:     Pali Rohár <pali.rohar@...il.com>
Cc:     Jean Delvare <jdelvare@...e.com>,
        Steven Honeyman <stevenhoneyman@...il.com>,
        <valdis.kletnieks@...edu>,
        Jochen Eisinger <jochen@...guin-breeder.org>,
        Gabriele Mazzotta <gabriele.mzt@...il.com>,
        Andy Lutomirski <luto@...nel.org>,
        <mario_limonciello@...l.com>, Alex Hung <alex.hung@...onical.com>,
        MichaÅ‚ KÄ™pieÅ„ <kernel@...pniu.pl>,
        Takashi Iwai <tiwai@...e.de>, <linux-i2c@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <platform-driver-x86@...r.kernel.org>
Subject: Re: [PATCH] i2c: i801: Register optional lis3lv02d i2c device on  Dell machines

On Tue, Dec 27, 2016 at 02:51:01PM +0100, Pali Rohár wrote:
> On Tuesday 27 December 2016 14:43:49 Wolfram Sang wrote:
> > > Dell platform team told us that some (DMI whitelisted) Dell
> > > Latitude machines have ST microelectronics accelerometer at i2c
> > > address 0x29. That
> > > i2c address is not specified in DMI or ACPI, so runtime detection
> > > without
> > > whitelist which is below is not possible.
> >
> > I'd think this should rather live somewhere in
> > drivers/platform/x86/dell*.c?
>
> i2c_new_device() with lis3lv02d for i801 i2c bus needs to be called
> after initializing i2c-i801 bus driver.
>
> I have no idea how to do it (properly) outside of i2c-i801.c file.

I once used bus_notifiers to achieve something similar. You could check
arch/arm/mach-shmobile/regulator-quirk-rcar-gen2.c to see an action
triggered once a client device got added, but you could act on another
action like BUS_NOTIFY_BOUND_DRIVER. I used exactly that, too, somewhen
somewhere.  Haven't checked if that helps here, too. And since we have 
a
precedence (Fujitsu case), I'll leave it to Jean who is the maintainer
of this driver.

Thanks,

    Wolfram