I can try to test it with ... proposed patch :-D
Yes please.
Do you have a reference where I can get more information about it?
http://en.wikipedia.org/wiki/Binary-coded_decimal
might be what you want.
P: Vendor=10d6 ProdID=1100 Rev= 1.00
In plain hex, these three numbers are x 10D6 1100 0100.
See that? The hex that prints mangled as "Rev= 1.00" or as "Rev=
01.00" crossed the USB cable as the four nybbles x0100.
By the rules of two's complement, x0100 = 256. By the rules of BCD,
x0100 = 0100 and you put the decimal point where you please, yielding
any of .0100 0.100 01.00 010.0 0100., also 0.00100, etc. By the
rules of USB BCD, you put the decimal point in the middle, yielding
01.00.
Where Linux says Vendor ProdID Rev, Windows says VID PID. Usb.org
says idVendor idProduct bcdDevice. All those words are names for the
same numbers. For your sample, x10D6 is the idProduct = VID =
Vendor, x1100 is the idVendor = PID = ProdID, and x0100 is the
bcdDevice = Rev.
Incidentally, the bcdUSB contained in that same "device descriptor"
struct is a revision of something else entirely, having been brought
to you by the same Usb.org people who say their Full Speed is slower
than their Hi Speed.
... you patched ...
10d6, 1100, 0000-9999
Your sample represents a group of devices all of which share the
bcdDevice of x0100.
The value x0100 is found in the range x0000..x9999. All USB bcd
values should appear in the range x0000..x9999, so that range is
functionally equivalent to the range x0000..xFFFF, i.e., no
restriction at all, just as if you referred to the device by idVendor
idProduct alone in a Windows .inf file, without considering the
bcdDevice.
... What you should have patched is ...
10d6 1100 0100-0100
The value x0100 and only the value x0100 is found in the more narrow
range of x0100..x0100.
... The "Rev" is the bcdDevice number, and is the range in question.
That make sense?
What I don't understand why I should use 0100 instead of 1100?
Does anything remain unclear?
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