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wireless: add wiphy channel freq to channel struct lookup helper 

Add ieee80211_get_channel() which gets you a channel struct for a
specific wiphy if that channel is present in that wiphy.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Johannes Berg 2008-03-16 18:34:33 +01:00 committed by John W. Linville
parent 857485c0c4
commit 906c730a2d
2 changed files with 29 additions and 0 deletions
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6
include/net/wireless.h
View File

@ -304,4 +304,10 @@ extern int ieee80211_channel_to_frequency(int chan);
*/
extern int ieee80211_frequency_to_channel(int freq);
/**
* ieee80211_get_channel - get channel struct from wiphy for specified frequency
*/
extern struct ieee80211_channel *ieee80211_get_channel(struct wiphy *wiphy,
int freq);
#endif /* __NET_WIRELESS_H */

23
net/wireless/util.c
View File

@ -33,6 +33,29 @@ int ieee80211_frequency_to_channel(int freq)
}
EXPORT_SYMBOL(ieee80211_frequency_to_channel);
struct ieee80211_channel *ieee80211_get_channel(struct wiphy *wiphy,
int freq)
{
enum ieee80211_band band;
struct ieee80211_supported_band *sband;
int i;
for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
sband = wiphy->bands[band];
if (!sband)
continue;
for (i = 0; i < sband->n_channels; i++) {
if (sband->channels[i].center_freq == freq)
return &sband->channels[i];
}
}
return NULL;
}
EXPORT_SYMBOL(ieee80211_get_channel);
static void set_mandatory_flags_band(struct ieee80211_supported_band *sband,
enum ieee80211_band band)
{