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Date: Fri, 08 Dec 2006 22:32:00 -0700 (MST)
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To: ticso@cicely.de, ticso@cicely12.cicely.de
From: "M. Warner Losh" <imp@bsdimp.com>
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Cc: freebsd-arm@freebsd.org
Subject: Re: questions about current RM9200 state
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In message: <20061208114906.GJ54209@cicely12.cicely.de>
            Bernd Walter <ticso@cicely12.cicely.de> writes:
: On Fri, Dec 08, 2006 at 11:42:28AM +0100, Bernd Walter wrote:
: > On Thu, Dec 07, 2006 at 08:50:08PM -0700, M. Warner Losh wrote:
: > > In message: <20061208015032.GF54209@cicely12.cicely.de>
: > >             Bernd Walter <ticso@cicely12.cicely.de> writes:
: > > : But I can't probe the bus from userland:
: > > : [56]arm9# ./iic_probe /dev/iic0 
: > > : - and nothing listed.
: > > 
: > > twi doesn't support START/STOP ioctls that you use.  Hmmm, that's in
: > > p4 that I've removed them because I never got that working.  I also
: > > think the version in -head isn't the latest, working one.  I think you
: > > do the same thing with a 0 byte transfer.  Except we don't detect
: > > NOACK quite right yet, I'm afraid.  I'd expect an error each time you
: > > tried.
: > 
: > Ah - Ok, will switch to 0 Byte transfers and retest.
: 
: iic.c:
:         case I2CWRITE:
:                 if (s->count <= 0) {
:                         error = EINVAL;
:                         break;
:                 }
: 
: Well - it wouldn't work without NOACK detection anyway.

I think a zero-byte transfer would do it.

I've not updated iicsmb to use the new transfer paradigm.  That's my
bad.

Warner