target/linux/s3c24xx/files-2.6.30/drivers/ar6000/wlan/wlan_utils.c

   1 /*
   2  * Copyright (c) 2004-2005 Atheros Communications Inc.
   3  * All rights reserved.
   4  *
   5  * This module implements frequently used wlan utilies
   6  *
   7  * $Id: //depot/sw/releases/olca2.0-GPL/host/wlan/src/wlan_utils.c#1 $
   8  *
   9  *
  10  *  This program is free software; you can redistribute it and/or modify
  11  *  it under the terms of the GNU General Public License version 2 as
  12  *  published by the Free Software Foundation;
  13  *
  14  *  Software distributed under the License is distributed on an "AS
  15  *  IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
  16  *  implied. See the License for the specific language governing
  17  *  rights and limitations under the License.
  18  *
  19  *
  20  *
  21  */
  22
  23 #include <a_config.h>
  24 #include <athdefs.h>
  25 #include <a_types.h>
  26 #include <a_osapi.h>
  27
  28 /*
  29  * converts ieee channel number to frequency
  30  */
  31 A_UINT16
  32 wlan_ieee2freq(int chan)
  33 {
  34     if (chan == 14) {
  35         return 2484;
  36     }
  37     if (chan < 14) {    /* 0-13 */
  38         return (2407 + (chan*5));
  39     }
  40     if (chan < 27) {    /* 15-26 */
  41         return (2512 + ((chan-15)*20));
  42     }
  43     return (5000 + (chan*5));
  44 }
  45
  46 /*
  47  * Converts MHz frequency to IEEE channel number.
  48  */
  49 A_UINT32
  50 wlan_freq2ieee(A_UINT16 freq)
  51 {
  52     if (freq == 2484)
  53         return 14;
  54     if (freq < 2484)
  55         return (freq - 2407) / 5;
  56     if (freq < 5000)
  57         return 15 + ((freq - 2512) / 20);
  58     return (freq - 5000) / 5;
  59 }