On Monday 14 March 2011, Waldemar.Rymarkiewicz-++hxYGjEMp0AvxtiuMwx3w@public.gmane.org wrote:

quoted

If the usleep_range is trying to synchronize between the NFC 
and the I2C chip, you must wait for a notication from the NFC 
hardware that it's done.

No, it's simply there as I have been faceing i2c write error while
I do two consecutive writes.
The second fails now and then. That's seems to be a chip issue.
I will try to investigate this issue.

Ok. It sounds like a bug in the i2c driver, you should also take
a look there. Maybe it has never had to deal with this much
write data at once.

	Arnd