forked from Minki/linux
bd81525272
This adds a helper function that, given a bitmap of basic rates and a bitrate returns the response rate for this rate. Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: John W. Linville <linville@tuxdriver.com>
141 lines
3.1 KiB
C
141 lines
3.1 KiB
C
/*
|
|
* Wireless utility functions
|
|
*
|
|
* Copyright 2007 Johannes Berg <johannes@sipsolutions.net>
|
|
*/
|
|
#include <net/wireless.h>
|
|
#include <asm/bitops.h>
|
|
#include "core.h"
|
|
|
|
struct ieee80211_rate *
|
|
ieee80211_get_response_rate(struct ieee80211_supported_band *sband,
|
|
u64 basic_rates, int bitrate)
|
|
{
|
|
struct ieee80211_rate *result = &sband->bitrates[0];
|
|
int i;
|
|
|
|
for (i = 0; i < sband->n_bitrates; i++) {
|
|
if (!(basic_rates & BIT(i)))
|
|
continue;
|
|
if (sband->bitrates[i].bitrate > bitrate)
|
|
continue;
|
|
result = &sband->bitrates[i];
|
|
}
|
|
|
|
return result;
|
|
}
|
|
EXPORT_SYMBOL(ieee80211_get_response_rate);
|
|
|
|
int ieee80211_channel_to_frequency(int chan)
|
|
{
|
|
if (chan < 14)
|
|
return 2407 + chan * 5;
|
|
|
|
if (chan == 14)
|
|
return 2484;
|
|
|
|
/* FIXME: 802.11j 17.3.8.3.2 */
|
|
return (chan + 1000) * 5;
|
|
}
|
|
EXPORT_SYMBOL(ieee80211_channel_to_frequency);
|
|
|
|
int ieee80211_frequency_to_channel(int freq)
|
|
{
|
|
if (freq == 2484)
|
|
return 14;
|
|
|
|
if (freq < 2484)
|
|
return (freq - 2407) / 5;
|
|
|
|
/* FIXME: 802.11j 17.3.8.3.2 */
|
|
return freq/5 - 1000;
|
|
}
|
|
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)
|
|
{
|
|
int i, want;
|
|
|
|
switch (band) {
|
|
case IEEE80211_BAND_5GHZ:
|
|
want = 3;
|
|
for (i = 0; i < sband->n_bitrates; i++) {
|
|
if (sband->bitrates[i].bitrate == 60 ||
|
|
sband->bitrates[i].bitrate == 120 ||
|
|
sband->bitrates[i].bitrate == 240) {
|
|
sband->bitrates[i].flags |=
|
|
IEEE80211_RATE_MANDATORY_A;
|
|
want--;
|
|
}
|
|
}
|
|
WARN_ON(want);
|
|
break;
|
|
case IEEE80211_BAND_2GHZ:
|
|
want = 7;
|
|
for (i = 0; i < sband->n_bitrates; i++) {
|
|
if (sband->bitrates[i].bitrate == 10) {
|
|
sband->bitrates[i].flags |=
|
|
IEEE80211_RATE_MANDATORY_B |
|
|
IEEE80211_RATE_MANDATORY_G;
|
|
want--;
|
|
}
|
|
|
|
if (sband->bitrates[i].bitrate == 20 ||
|
|
sband->bitrates[i].bitrate == 55 ||
|
|
sband->bitrates[i].bitrate == 110 ||
|
|
sband->bitrates[i].bitrate == 60 ||
|
|
sband->bitrates[i].bitrate == 120 ||
|
|
sband->bitrates[i].bitrate == 240) {
|
|
sband->bitrates[i].flags |=
|
|
IEEE80211_RATE_MANDATORY_G;
|
|
want--;
|
|
}
|
|
|
|
if (sband->bitrates[i].bitrate != 10 &&
|
|
sband->bitrates[i].bitrate != 20 &&
|
|
sband->bitrates[i].bitrate != 55 &&
|
|
sband->bitrates[i].bitrate != 110)
|
|
sband->bitrates[i].flags |=
|
|
IEEE80211_RATE_ERP_G;
|
|
}
|
|
WARN_ON(want != 0 && want != 3 && want != 6);
|
|
break;
|
|
case IEEE80211_NUM_BANDS:
|
|
WARN_ON(1);
|
|
break;
|
|
}
|
|
}
|
|
|
|
void ieee80211_set_bitrate_flags(struct wiphy *wiphy)
|
|
{
|
|
enum ieee80211_band band;
|
|
|
|
for (band = 0; band < IEEE80211_NUM_BANDS; band++)
|
|
if (wiphy->bands[band])
|
|
set_mandatory_flags_band(wiphy->bands[band], band);
|
|
}
|