CVS commit: src/sys/dev/i2c

[Paul Goyette <pgoyette%netbsd.org@localhost>]

Module Name:    src
Committed By:   pgoyette
Date:           Tue Feb  3 16:41:31 UTC 2009

Modified Files:
        src/sys/dev/i2c: i2c.c

Log Message:
Change the i2c bus scan routine to use the write_quick protocol for most
addresses, rather than trying to read a byte of data from the device.

Some devices don't like to be read from (certain clock devices are, I'm
told, write-only!), while others expect to be asked only for words (or
pairs of bytes).

While here, skip a bunch of i2c addresses that can't (or at the very
least, shouldn't) have any slave devices.

This is the only use in NetBSD of the quick_read/quick_write protocol,
and it remains disabled by default.  I've updated all the generic i2c
drivers to handle the quick_* protocols, but several port-specific
drivers have not been updated since I'm in no position to verify that
the changes work.  Assistance from sandpoint, arm/xscale, evbarm/gumstix,
mips/alchemy, and macppc would be greatly appreciated.


To generate a diff of this commit:
cvs rdiff -r1.22 -r1.23 src/sys/dev/i2c/i2c.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.