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Commit bd815252 authored by Johannes Berg's avatar Johannes Berg Committed by John W. Linville
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wireless: implement basic rate helper function 



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: default avatarJohannes Berg <johannes@sipsolutions.net>
Signed-off-by: default avatarJohn W. Linville <linville@tuxdriver.com>
parent 743b97ca

include/net/wireless.h

+16 −0
Original line number Diff line number Diff line
@@ -340,6 +340,22 @@ ieee80211_get_channel(struct wiphy *wiphy, int freq) 
	return __ieee80211_get_channel(wiphy, freq);

}



/**

 * ieee80211_get_response_rate - get basic rate for a given rate

 *

 * @sband: the band to look for rates in

 * @basic_rates: bitmap of basic rates

 * @bitrate: the bitrate for which to find the basic rate

 *

 * This function returns the basic rate corresponding to a given

 * bitrate, that is the next lower bitrate contained in the basic

 * rate map, which is, for this function, given as a bitmap of

 * indices of rates in the band's bitrate table.

 */

struct ieee80211_rate *

ieee80211_get_response_rate(struct ieee80211_supported_band *sband,

			    u64 basic_rates, int bitrate);



/**

 * regulatory_hint - driver hint to the wireless core a regulatory domain

 * @wiphy: the wireless device giving the hint (used only for reporting

net/wireless/util.c

+19 −0
Original line number Diff line number Diff line
@@ -7,6 +7,25 @@ 
#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)