Date:	Mon, 14 Mar 2011 11:08:32 +0100
From:	Takashi Iwai <tiwai@...e.de>
To:	"Hans Verkuil" <hverkuil@...all.nl>
Cc:	"Ondrej Zary" <linux@...nbow-software.org>, jirislaby@...il.com,
	alsa-devel@...a-project.org,
	"Kernel development list" <linux-kernel@...r.kernel.org>,
	linux-media@...r.kernel.org
Subject: Re: [alsa-devel] radio-maestro broken (conflicts with snd-es1968)

At Mon, 14 Mar 2011 10:59:47 +0100,
Hans Verkuil wrote:
> 
> > At Sat, 12 Mar 2011 19:52:39 +0100,
> > Hans Verkuil wrote:
> >>
> >> On Saturday, March 12, 2011 19:19:00 Ondrej Zary wrote:
> >> > Hello,
> >> > the radio-maestro driver is badly broken. It's intended to drive the
> >> radio on
> >> > MediaForte ESS Maestro-based sound cards with integrated radio (like
> >> > SF64-PCE2-04). But it conflicts with snd_es1968, ALSA driver for the
> >> sound
> >> > chip itself.
> >> >
> >> > If one driver is loaded, the other one does not work - because a
> >> driver is
> >> > already registered for the PCI device (there is only one). This was
> >> probably
> >> > broken by conversion of PCI probing in 2006:
> >> > ttp://lkml.org/lkml/2005/12/31/93
> >> >
> >> > How to fix it properly? Include radio functionality in snd-es1968 and
> >> delete
> >> > radio-maestro?
> >>
> >> Interesting. I don't know anyone among the video4linux developers who
> >> has
> >> this hardware, so the radio-maestro driver hasn't been tested in at
> >> least
> >> 6 or 7 years.
> >>
> >> The proper fix would be to do it like the fm801.c alsa driver does: have
> >> the radio functionality as an i2c driver. In fact, it would not surprise
> >> me at all if you could use the tea575x-tuner.c driver (in
> >> sound/i2c/other)
> >> for the es1968 and delete the radio-maestro altogether.
> >
> > I guess simply porting radio-maestro codes into snd-es1968 would work
> > without much hustles, and it's a bit safe way to go for now; smaller
> > changes have less chance for breakage, and as little people seem using
> > this driver, it'd be better to take a safer option, IMO.
> 
> I assume someone has hardware since someone reported this breakage. So try
> to use tuner-tea575x for the es1968. It shouldn't be too difficult.

We can try at least, yes...

> Additional cleanup should probably wait until we find a tester for the
> fm801 as well.

My concern is that having both testers might be not easy, if we need
to change something in tea575-tuner side.
(We have already the same code, so porting it doesn't increase the code
 size :)  Anyway I agree to unify in a long term.  Let's see whether
tea-575x works as is.


thanks,

Takashi

> I don't like the idea to duplicate code.
> 
> Regards,
> 
>       Hans
> 
> > If we have active testers for both devices, it's nicer to go forward
> > to clean-up works indeed, though.
> >
> >
> > thanks,
> >
> > Takashi
> >
> >> Both are for the tea575x tuner, although radio-maestro seems to have
> >> better
> >> support for the g_tuner operation. It doesn't seem difficult to add that
> >> to
> >> tea575x-tuner.c.
> >>
> >> The fm801 code for driving the tea575x is pretty horrible and it should
> >> be
> >> possible to improve that. I suspect that those read/write/mute functions
> >> really belong in tea575x-tuner.c and that only the low-level gpio
> >> actions
> >> need to be in the fm801/es1968 drivers.
> >>
> >> Hope this helps.
> >>
> >> Regards,
> >>
> >> 	Hans
> >>
> >> BTW: if anyone has spare hardware for testing the
> >> radio-maestro/tea575x-tuner,
> >> then I'm interested.
> >>
> >> --
> >> Hans Verkuil - video4linux developer - sponsored by Cisco
> >> _______________________________________________
> >> Alsa-devel mailing list
> >> Alsa-devel@...a-project.org
> >> http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
> >>
> >
> 
> 
> -- 
> Hans Verkuil - video4linux developer - sponsored by Cisco
> 
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