Re: [PATCH] mac80211: use hardware flags for signal/noise units

[bruno randolf <bruno@thinktube.com>]

On Tuesday 01 April 2008 02:47:56 Jean Tourrilhes wrote:
> > do you think it would be feasible
> > to require the drivers to normalize their RSSI to a range of 0-100,
> > so we would have at least some consistency between devices? (of
> > course their steps within this percentage would be different and it
> > would still be impossible to compare these values across different
> > devices).
>
> 	If the measurement is not linear or log, it does not make
> sense mandating the 0-100, because 50 won't be the mid-point. And we
> assume that devices are not consistent to start with...
> 	Anyway, to avoid quantisation errors, I prefer to defer
> normalisation to the end software. For example, if the app use a 64
> pixel window to show the RSSI, it wants a value 0-63, not 0-100.

ok, got it :) i will keep max_signal for this, then. it should be used for 
IEEE80211_HW_SIGNAL_UNSPEC and IEEE80211_HW_SIGNAL_DB. in the case of dBm i 
think we can always assume the same range.

cheers,
bruno