libusbgx: fix bMaxPower handling #105
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libusbgx expects the maximum power consumption value to be specified in 2mA units, but the kernel takes the "real" mA value and does the conversion to 2mA units when constructing the High Speed descriptors. Convert the value to and from the expected format when reading from or writing to configfs. This is sufficient for High Speed devices where the maximum possible current draw is 500mA, but still does not permit SuperSpeed or faster devices advertising current draw up to 900mA.
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libusbgx expects the maximum power consumption value to be specified in 2mA units, but the kernel takes the "real" mA value and does the conversion to 2mA units when constructing the High Speed descriptors.
Convert the value to and from the expected format when reading from or writing to configfs.
This is sufficient for High Speed devices where the maximum possible current draw is 500mA, but still does not permit SuperSpeed or faster devices advertising current draw up to 900mA.