linux-kernel - Re: [PATCH v2 1/1] Platform: x86: Add Chrome OS Laptop driver

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Date:	Fri, 2 Nov 2012 13:03:44 +0000
From:	Corentin Chary <corentin.chary@...il.com>
To:	Olof Johansson <olof@...om.net>
Cc:	Benson Leung <bleung@...omium.org>,
	Matthew Garrett <mjg@...hat.com>,
	"platform-driver-x86@...r.kernel.org" 
	<platform-driver-x86@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>, olofj@...omium.org
Subject: Re: [PATCH v2 1/1] Platform: x86: Add Chrome OS Laptop driver

On Fri, Nov 2, 2012 at 12:45 PM, Olof Johansson <olof@...om.net> wrote:
> On Fri, Oct 26, 2012 at 10:30 AM, Corentin Chary
> <corentin.chary@...il.com> wrote:
>
>> Looks better, but I'm curious, what is the final purpose of this driver ?
>> What ABI will be exposed, who will use it ?
>>
>> If it is going to be bigger, it may be a good idea to convert it to a
>> real platform driver (platform_drivers/platform_device stuff).
>
> It's not a driver per se. It's platform glue that, based on the DMI
> table, registers platform and i2c devices (at this time only i2c
> devices).
>
> Unfortunately there's no way to do this nicely from userspace after
> boot, since there's limits to how much data you can provide with the
> simpler userspace-driven i2c probing protocol.
>
> So, there's no user-facing ABI on this, and no one is expected to use
> it from userspace. It's just there to make sure that the un-probably
> devices on this kind of hardware gets bound to drivers properly.
>
> If it's converted to a platform_driver, how do you expect that to
> probe, where would the platform_device be registered?

I guess I would check dmi in the module init method, and then use the
probe callback of platform_create_bundle to do more probing if
necessary.


--
Corentin Chary
http://xf.iksaif.net
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