> I wonder if it's worth to have this as a general callback in the i2c
> layer.

There kernel has a framework in the making. I still need to give more
review to it:

http://article.gmane.org/gmane.linux.drivers.i2c/12558

-- 
Pengutronix e.K.                           | Wolfram Sang                |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |