p54: better rssi->dbm conversion for longbow phys
This patch should fix the dodgy signal and noise value reports for most longbow (p54spi) users: e.g.: (an older tcpdump extract) > 2.0 Mb/s 2437 MHz (0x00a0) -49dB signal -41dB noise > 1.0 Mb/s 2437 MHz (0x00a0) 4dB signal -41dB noise The formula is taken from stlc45xx: http://gitorious.org/stlc45xx/mainline/blobs/master/stlc45xx.c#line1199 Signed-off-by: Christian Lamparter <chunkeey@googlemail.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
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@ -275,15 +275,15 @@ static int p54_rssi_to_dbm(struct p54_common *priv, int rssi)
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{
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int band = priv->hw->conf.channel->band;
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if (priv->rxhw != 5)
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if (priv->rxhw != 5) {
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return ((rssi * priv->rssical_db[band].mul) / 64 +
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priv->rssical_db[band].add) / 4;
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else
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} else {
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/*
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* TODO: find the correct formula
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*/
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return ((rssi * priv->rssical_db[band].mul) / 64 +
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priv->rssical_db[band].add) / 4;
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return rssi / 2 - 110;
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}
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}
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/*
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