K 10
svn:author
V 3
avg
K 8
svn:date
V 27
2018-05-21T21:04:31.400149Z
K 7
svn:log
V 632
uchcom: extend hardware support to version 0x30

This change adds support for a UBS<->RS232 adapter based on CH340 (or an
analogue) that I own.  The device seems to have a newer internal version
(0x30) and the existing code incorrectly configures line control for it
resulting in garbled transmission.  The changes are based on what I
learned in Linux drivers for the same hardware.

Additional changes:
- use UCHCOM_REG_LCR1 / UCHCOM_REG_LCR2 instead of explicit 0x18 and
  0x25
- use NULL instead of 0 where a pointer is expected

Reviewed by:	hselasky
MFC after:	3 weeks
Differential Revision: https://reviews.freebsd.org/D15498

END