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comment about the magic number -149

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Warner Losh 2002-08-21 05:35:51 +00:00
parent abc38e4485
commit 87c397af5c
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=102206
1 changed files with 6 additions and 0 deletions
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6
sys/dev/wi/if_wi.c
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@ -2781,6 +2781,12 @@ wi_cache_store(struct wi_softc *sc, struct ether_header *eh,
sig = (rx_quality >> 8) & 0xFF;
noise = rx_quality & 0xFF;
/*
* -149 is Lucent specific to convert to dBm. Prism2 cards do
* things differently, sometimes don't have a noise measurement,
* and is firmware dependent :-(
*/
sc->wi_sigcache[cache_slot].signal = sig - 149;
sc->wi_sigcache[cache_slot].noise = noise - 149;
sc->wi_sigcache[cache_slot].quality = sig - noise;