linux-kernel - Re: Platform device id

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Date:	Tue, 11 Sep 2007 09:43:34 +0200 (CEST)
From:	"Jean Delvare" <khali@...ux-fr.org>
To:	hmh@....eng.br
CC:	"David Brownell" <david-b@...bell.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"gregkh@...e.de" <gregkh@...e.de>,
	"dmitry.torokhov@...il.com" <dmitry.torokhov@...il.com>
Subject: Re: Platform device id


Hi Henrique,

On 9/10/2007, "Henrique de Moraes Holschuh" <hmh@....eng.br> wrote:
>On Sat, 08 Sep 2007, Jean Delvare wrote:
>> * Detection could be moved to user-space entirely, then we would only
>> need a way to instantiate these specific devices from user-space. This
>> exists in other areas (scsi, network) for quite some times already so
>> it shouldn't be too difficult.
>
>Don't like that one, sorry.  Detection often needs the kind of access to
>hardware that is better off contained in the kernel.

Yes, good point.

>(...)
>I will see what I can do about breaking it up in various modules.  But this
>can be unoptimal. If I took it too seriously, thinkpad-acpi would break into
>at least five different modules, if not more, and at least one or two
>modules would need to be there for the common code.  There has to be a
>middle ground somewhere, I think.

I don't know your code and I don't really have the time to look at it
in depth, but I'm a bit surprised. Presumably your driver is
implementing a number of interfaces (e.g. hwmon) and you create a class
device for each one. You can have as many class devices hanging of a
(physical) device, so I fail to see why you would need to register
several (physical) devices.

--
Jean Delvare
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