HID: fix unit exponent parsing
authorBenjamin Tissoires <benjamin.tissoires@gmail.com>
Wed, 14 Nov 2012 15:59:15 +0000 (16:59 +0100)
committerJiri Kosina <jkosina@suse.cz>
Thu, 15 Nov 2012 09:07:55 +0000 (10:07 +0100)
HID spec details special values for the HID field unit exponent.
Basically, the range [0x8..0xf] correspond to [-8..-1], so this is
a standard two's complement on a half-byte.

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@gmail.com>
Acked-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

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