Major improvements to the ch341 driver v3

From: Grigori Goronzy
Date: Sun Apr 10 2016 - 19:46:55 EST


Hi,

here's a revised v3 of my ch341 patchset sent earlier this month.
Thanks to everyone who provided feedback. Changes compared to the
last submission have been indicated in the commit messages.

Please review.

Best regards
Grigori