linux-kernel - Re: [alsa-devel] radio-maestro broken (conflicts with snd-es1968)

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Message-Id: <201103141128.01259.linux@rainbow-software.org>
Date:	Mon, 14 Mar 2011 11:28:01 +0100
From:	Ondrej Zary <linux@...nbow-software.org>
To:	"Hans Verkuil" <hverkuil@...all.nl>
Cc:	"Takashi Iwai" <tiwai@...e.de>, 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)

On Monday 14 March 2011, 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.
> Additional cleanup should probably wait until we find a tester for the
> fm801 as well.

I have the hardware - both ES1968 (SF64-PCE2-04) and FM801 cards (SF64-PCR) 
with these tuners. I remember fixing mute in tea5757x-tuner back in 2009 
(testing it on SF64-PCR).

> I don't like the idea to duplicate code.

I don't like that either. I've done a quick hack - copied radio support from 
fm801 and radio_bits_get() and radio_bits_set() from radio-maestro to es1968 
and it seems to basically work.
Now I just need some more time to finish it, then move everything good from 
radio-maestro to tea575x-tuner and delete radio-maestro.

IIRC, the TEA5757 tuner is also present on at least one ISA radio card - 
SF16-FMR2 (which I also have).

-- 
Ondrej Zary
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