[alsa-devel] Suggestion for getting alsa to use Conexant
tiwai at suse.de
Fri May 25 23:44:44 CEST 2007
At Fri, 25 May 2007 09:37:44 -0700,
Tobin Davis wrote:
> Just out of curiosity, has anyone with these codecs tried the linuxant
> software? I looked at it briefly, and they are modifying my patch_conexant.c
> driver. Some of the changes I may include in the main alsa driver (hey, I
> wrote the bulk, so why not), some of it would never pass kernel coding style.
> I am kind of peeved that they don't bother to communicate with the alsa team,
> instead they take all of the hda code and hack it up, adding their copyright
> info to the code header (see header patch attached). Takashi, what's your
> take on this?
It's GPL and they are allowed to that. And I'm not surprised at all
by their action. It's a typical one that many hardware vendors take.
The problem is that their modification would be never accepted because
of the binary-only part. As long as this exists, Conexant will keep
doing in this way because _they_ need the control over this, not we,
the open-source community.
I think the best would to convince them to rewrite the code to
user-space daemon like slmodemd, so that they no longer need to touch
the kernel world. This will make it eventually easier for them to
maintain their codes. My upcoming hda-tools is developed also for
such a purpose...
> On Fri, 2007-05-25 at 12:14 +0200, Takashi Iwai wrote:
> At Thu, 24 May 2007 19:32:55 -0700,
> Tobin Davis wrote:
> > I don't think this is limited to the Conexant CX20549 (5045) or the
> > CX20551 (5047). I have a laptop with a Conexant vendor ID of 2bfa. The
> > hda-intel driver picks it up, but uses the hda-generic configuration.
> > On the CX20549 & CX20551, I think I need to toggle a bit to enable the
> > MFG portion. I have a test board here, but the drivers are not
> > detecting it, even without my patch_conexant code. I'll look at the
> > intel-80xm module, but it is written for the AC'97 bus specification,
> > which is very different from the HDA bus specification.
> The bus design isn't a so big issue, but the problem would be rather
> the difference of the codec/controller communication. For example,
> smartlink modem codecs (si3054) and compatibles are already supported
> in patch_si3054.c. As you can see, the code is really small.
> AFAIK, the conexant modem codec requires extra communication, a kind
> of ACK, and thus incompatible with smartlink codecs. Similarly, the
> intel8x0m driver also doesn't support conexant chips because the
> conexant codecs need different controls.
> Ideally, the whole encoding stuff should go to the user-space like
> slmodemd. I once tried to convince Conexant guys to do that, but they
> disagreed because of lack of man power. To me, it's hard to imagine
> because keeping the kernel driver needs more effort...
> > Tobin
> > On Wed, 2007-05-02 at 21:13 -0500, Victor Schneider wrote:
> > > How about being able to parameterize Alsa modules so that the intel 80xm
> > > module finds any hda modem that also acts as an Intel hda chip? I am
> > > referring to the Conexant combination modem and hda chip that gets
> > > identified as "Conexant Waikiki" by alsamixer, but that 80xm can't find as a
> > > modem. Giving the 80xm module the device:identifier value to override its
> > > detection of the Intel version of the Conexant hda modem might let slmodemd
> > > work.
> > >
> > > _______________________________________________
> > > Alsa-devel mailing list
> > > Alsa-devel at alsa-project.org
> > > http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
> > --
> > Tobin Davis <tdavis at dsl-only.net>
> > _______________________________________________
> > Alsa-devel mailing list
> > Alsa-devel at alsa-project.org
> > http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
> Tobin Davis <tdavis at dsl-only.net>
> [2 cxtheader.patch <text/x-patch; UTF-8 (7bit)>]
> --- ../../../../../../../alsa/alsa-project/alsa-driver/alsa-kernel/pci/hda/patch_conexant.c 2007-05-23 09:54:08.000000000 -0700
> +++ patch_conexant.c 2007-05-25 09:16:39.000000000 -0700
> @@ -1,10 +1,12 @@
> - * HD audio interface patch for Conexant HDA audio codec
> + * HD audio interface patch for Conexant HDA audio/modem codec
> * Copyright (c) 2006 Pototskiy Akex <alex.pototskiy at gmail.com>
> * Takashi Iwai <tiwai at suse.de>
> * Tobin Davis <tdavis at dsl-only.net>
> + * Copyright (c) 2005-2006 Linuxant inc.
> + *
> * This driver is free software; you can redistribute it and/or modify
> * it under the terms of the GNU General Public License as published by
> * the Free Software Foundation; either version 2 of the License, or
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