Lots of noob questions on writing an ALSA driver for SM501

[Bill Gatliff <bgat@billgatliff.com>]

Guys:


I'm attempting to write my first ALSA driver.  My objective is to get 
sounds to emerge through a UCB1400 connected to an SM501's AC97-link 
controller, and to receive sounds coming from the UCB1400's audio input(s).

I'm going over Takashi Iwai's "Writing an ALSA Driver" document, but 
there are a few things I just don't understand yet.  I'm hoping that 
someone here will be able to set me straight.

The SM501 has an AC97-Link controller, but nothing else related to audio 
as far as I can tell.  In my hardware the SM501 is memory-mapped, and is 
not a PCI device.  The host processor is an AT91RM9200 (ARM).

As far as I can tell, I need a "PCM Interface" driver to provide a PCM 
device file to userspace.  It also looks like I need an "AC97 Interface" 
driver to provide access to the UCB1400 during playback and recording.  
Is this right?

I'm hoping someone will set me straight here.  Thanks!!


b.g.

-- 
Bill Gatliff
bgat@billgatliff.com

The true Southern watermelon is a boon apart, and not to be mentioned
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