From mboxrd@z Thu Jan  1 00:00:00 1970
Message-ID: <74e7ad752edff0def1f6eb2267b7a225@quintile.net>
From: "Steve Simon" <steve@quintile.net>
Date: Sun, 17 Nov 2013 23:04:43 +0000
To: 9fans@9fans.net
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Subject i2c and gpio

I need an i2c driver for plan9, anyone implemented
one in the past and have opinions on what they should
look like?

I have to revisit some old code but I wrote a driver for
another OS which implemeted 255 virtual files in /dev/i2c/*
one for each possible address (well there are some reserved
ones but you get the idea).

I need GPIO pins too. again in OSs passim I just had a file
per pin, no clever magical mapping of bits into integers.

I then allowed a write to reconfigure the port as an output,
or a read to set it as an input; the I/O config being persistent.

This worked well for us but perhaps is naive?

Thoughts anyone?

-Steve