linux-kernel - Re: Bitbanging i2c bus driver using the GPIO API

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Message-ID: <20070426132905.GP5575@csclub.uwaterloo.ca>
Date:	Thu, 26 Apr 2007 09:29:06 -0400
From:	lsorense@...lub.uwaterloo.ca (Lennart Sorensen)
To:	Jean Delvare <khali@...ux-fr.org>
Cc:	Jordan Crouse <jordan.crouse@....com>,
	Haavard Skinnemoen <hskinnemoen@...el.com>,
	David Brownell <david-b@...bell.net>,
	Bryan Wu <bryan.wu@...log.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Deepak Saxena <dsaxena@...xity.net>,
	linux-kernel@...r.kernel.org,
	Christer Weinigel <wingel@...o-system.com>
Subject: Re: Bitbanging i2c bus driver using the GPIO API

On Thu, Apr 26, 2007 at 02:56:34PM +0200, Jean Delvare wrote:
> After digging some more, I finally managed to get my hands back on it:
> http://lists.lm-sensors.org/pipermail/lm-sensors/2006-April/016009.html
> http://lists.lm-sensors.org/pipermail/lm-sensors/2006-May/016053.html
> 
> This isn't "randomly hitting ISA ports", this is reading the base I/O
> addresses from LPC configuration space. That's much better than letting
> the user set the addresses using module parameters.
> 
> Lennart, can you please provide the output of the following commands on
> your system?
> 
> isadump 0x2e 0x2f 5
> isadump 0x2e 0x2f 6

These return all 0xff.  For example:

router2:~# isadump 0x2e 0x2f 5
WARNING! Running this program can cause system crashes, data loss and worse!
I will probe address register 0x2e and data register 0x2f.
Probing bank 5 using bank register 0x07.
Continue? [Y/n]
     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
10: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
20: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
30: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
40: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
50: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
60: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
70: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
90: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
a0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
b0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
c0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
d0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
e0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
f0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff

> isadump 0x4e 0x4f 5
> isadump 0x4e 0x4f 6

These return all 0x00

On the Geode LX800 where scx200_acb does work all 4 commands return all
0xff.

--
Len Sorensen
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