MosChip 7840 dual port ucom

Dear colleagues,

any hints/directions to get MosChip 7840 dual port USB to RS232 adapter 
working? In usbdevs output the device is shown as

 port 1 addr 2: high speed, power 100 mA, config 1, product 0x7840(0x7840), 
vendor 0x9710(0x9710), rev 0.01

Thanks in advance.

-- 
Sincerely,
D.Marck                                     [DM5020, MCK-RIPE, DM3-RIPN]
[ FreeBSD committer:                                 marck@FreeBSD.org ]
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*** Dmitry Morozovsky --- D.Marck --- Wild Woozle --- marck@rinet.ru ***
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