drivers/staging/ath6kl/wlan/src/wlan_utils.c

   1 //------------------------------------------------------------------------------
   2 // <copyright file="wlan_utils.c" company="Atheros">
   3 //    Copyright (c) 2004-2010 Atheros Corporation.  All rights reserved.
   4 //
   5 //
   6 // Permission to use, copy, modify, and/or distribute this software for any
   7 // purpose with or without fee is hereby granted, provided that the above
   8 // copyright notice and this permission notice appear in all copies.
   9 //
  10 // THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  11 // WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  12 // MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  13 // ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  14 // WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  15 // ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  16 // OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  17 //
  18 //
  19 //------------------------------------------------------------------------------
  20 //==============================================================================
  21 // This module implements frequently used wlan utilies
  22 //
  23 // Author(s): ="Atheros"
  24 //==============================================================================
  25 #include <a_config.h>
  26 #include <athdefs.h>
  27 #include <a_types.h>
  28 #include <a_osapi.h>
  29
  30 /*
  31  * converts ieee channel number to frequency
  32  */
  33 u16 wlan_ieee2freq(int chan)
  34 {
  35     if (chan == 14) {
  36         return 2484;
  37     }
  38     if (chan < 14) {    /* 0-13 */
  39         return (2407 + (chan*5));
  40     }
  41     if (chan < 27) {    /* 15-26 */
  42         return (2512 + ((chan-15)*20));
  43     }
  44     return (5000 + (chan*5));
  45 }
  46
  47 /*
  48  * Converts MHz frequency to IEEE channel number.
  49  */
  50 u32 wlan_freq2ieee(u16 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 }