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cfg80211: Extend channel to frequency mapping for 802.11j

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Extend channel to frequency mapping for 802.11j Japan 4.9GHz band, according to
IEEE802.11 section 17.3.8.3.2 and Annex J. Because there are now overlapping
channel numbers in the 2GHz and 5GHz band we can't map from channel to
frequency without knowing the band. This is no problem as in most contexts we
know the band. In places where we don't know the band (and WEXT compatibility)
we assume the 2GHz band for channels below 14.

This patch does not implement all channel to frequency mappings defined in
802.11, it's just an extension for 802.11j 20MHz channels. 5MHz and 10MHz
channels as well as 802.11y channels have been omitted.

The following drivers have been updated to reflect the API changes:
iwl-3945, iwl-agn, iwmc3200wifi, libertas, mwl8k, rt2x00, wl1251, wl12xx.
The drivers have been compile-tested only.

Signed-off-by: Bruno Randolf <br1@einfach.org>
Signed-off-by: Brian Prodoehl <bprodoehl@gmail.com>
Acked-by: Luciano Coelho <coelho@ti.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Bruno Randolf
2011-01-17 13:37:28 +09:00
committed by John W. Linville
parent 60f2d1d506
commit 59eb21a650
18 changed files with 71 additions and 40 deletions
Download Patch File Download Diff File Expand all files Collapse all files

5
net/wireless/wext-compat.c
View File

@ -267,9 +267,12 @@ int cfg80211_wext_freq(struct wiphy *wiphy, struct iw_freq *freq)
* -EINVAL for impossible things.
*/
if (freq->e == 0) {
enum ieee80211_band band = IEEE80211_BAND_2GHZ;
if (freq->m < 0)
return 0;
return ieee80211_channel_to_frequency(freq->m);
if (freq->m > 14)
band = IEEE80211_BAND_5GHZ;
return ieee80211_channel_to_frequency(freq->m, band);
} else {
int i, div = 1000000;
for (i = 0; i < freq->e; i++)