From: andrew may <acmay@acmay•homeip.net>
To: Kenneth Johansson <kenneth.johansson@etx•ericsson.se>
Cc: linuxppc-embedded@lists•linuxppc.org, kuster@pacbell•net,
acmay@acmay•homeip.ne
Subject: Re: IBM ocp I2C circular dependency
Date: Tue, 7 May 2002 09:16:25 -0700 [thread overview]
Message-ID: <20020507091625.B9190@ecam.san.rr.com> (raw)
In-Reply-To: <3CD7D04C.1E9122A0@etx.ericsson.se>
On Tue, May 07, 2002 at 03:02:04PM +0200, Kenneth Johansson wrote:
> Also I found a problem with the code when I access a i2c memory from
> userspace and no chip is present at that address. After that it's not
> possible to access anything else on the I2C bus. Works OK as long as I use
> addresses that have a device that answers (I think).
There is a suprising lack of copy to/from user functions in the i2c
code. This may be part of the problem but I think it needs to be fixed
more in the core code rather than each driver.
The driver should not support "Quick" 0 len transfers, I am not sure how
it handles them now. This may be another problem.
ps you forgot a "t" in .net.
** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
next prev parent reply other threads:[~2002-05-07 16:16 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-05-07 13:02 IBM ocp I2C circular dependency Kenneth Johansson
2002-05-07 14:04 ` Allen Curtis
2002-05-07 15:05 ` Kenneth Johansson
2002-05-07 15:10 ` Allen Curtis
2002-05-07 15:19 ` Armin
2002-05-07 16:16 ` andrew may [this message]
2002-05-07 16:42 ` Kenneth Johansson
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