Question about bcdDevice_(lo|hi)

[Marcus Harnisch <marcus.harnisch@gmx.net>]

Hi List,

I just started to use linux hotplug (2001_09_19). When I tried to find
the reason why no map-entry for my camcorder matches, I came across
something I really don't understand.

usb.agent matches the bcdDevice columns in a map file using the
following statements:

    : bcdDevice range $bcdDevice_hi $bcdDevice_lo actual $usb_bcdDevice
    if [ $USB_MATCH_DEV_LO -eq $(( $match_flags & $USB_MATCH_DEV_LO )) ] &&
       [ $usb_bcdDevice -lt $bcdDevice_lo ]; then
        continue
    fi

    # bcdDevice_lo <= bcdDevice < bcdDevice_hi
    if [ $USB_MATCH_DEV_HI -eq $(( $match_flags & $USB_MATCH_DEV_HI )) ] &&
       [ $usb_bcdDevice -ge $bcdDevice_hi ]; then
        continue
    fi

The according entries in the map-files for all devices are a 4-digit
hexnumber for bcdDevice_lo and a 2-digit hexnumber for
bcdDevice_hi. With *very* few exceptions if bcdDevice that is greater
or equal to bcdDevice_lo (first condition) it is also greater than
bcdDevice_hi. This causes no match to be found in the vast majority of
cases (Þvices).

In my particular case, bcdDevice is 0x0300. So for test purposes I set
up an entry in usb.usermap with bcdDevice_lo to 0x0300. Which 2-digit
hexnumber would match the second condition? When I set bcdDevice_hi to
any number (well, I didn't try all of 'em :) above 0x02ff, everything
worked fine.

I really can't believe that this is a bug that nobody has seen
before. Can somebody explain that to me?

Best regards,
     Marcus


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