linux-kernel - Re: patch driver-core-warn-about-duplicate-driver-names-on-the-same-bus.patch added to gregkh-2.6 tree

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Date:	Wed, 30 Apr 2008 08:34:36 +0200
From:	Takashi Iwai <tiwai@...e.de>
To:	Stas Sergeev <stsp@...et.ru>
Cc:	Greg KH <gregkh@...e.de>,
	Linux kernel <linux-kernel@...r.kernel.org>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>
Subject: Re: patch	driver-core-warn-about-duplicate-driver-names-on-the-same-bus.patch added to gregkh-2.6 tree

At Tue, 29 Apr 2008 23:28:42 +0400,
Stas Sergeev wrote:
> 
> Hello.
> 
> Takashi Iwai wrote:
> > Though, I think the snd-pcsp driver could be better built on the top
> > of input pcspkr driver, or coexist with it.  Then we'll have no more
> > conflict about platform name space.
> I was trying this in the past.
> This never worked out very well.

Why?

> I disliked the dependancies.
> Either snd-pcsp was loading pcspkr,
> or there had to be the global variable
> to prevent the concurrent access, and
> that hurts modularity.

But you anyway enable the input pcspkr feature in your snd-pcsp code.
So, basically you depend on (or build on) it.

> > When you compare input pcspkr.c and sound pcsp_input.c, you can find
> > that most of codes are identical.
> Yep, its a copy/paste mainly.
> I wanted a complete replacement.
> Back then, I've been told that multiple
> drivers controlling the same device is
> never a good idea. But I won't be surprised
> if that have changed since. :)
> 
> > What we'd need is a hook on
> > pcspkr.c that adds a dynamic check whether snd-pcsp (or any ohter)
> > is running.
> How?

What you need is a way to check whether input pcspkr can be usable or
not.  You can add a function pointer, for example.

> And also, with snd-pcsp you have a
> mixer control to disable the beeps,
> which I find sometimes even more
> usefull than the pcm sound itself. :)

Yes, that seems useful.


Takashi
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