bcmdrivers/broadcom/net/wl/impl2/shared/bcmwifi.c

   1 /*
   2  * Misc utility routines used by kernel or app-level.
   3  * Contents are wifi-specific, used by any kernel or app-level
   4  * software that might want wifi things as it grows.
   5  *
   6  * Copyright 2006, Broadcom Corporation
   7  * All Rights Reserved.
   8  *
   9  * This is UNPUBLISHED PROPRIETARY SOURCE CODE of Broadcom Corporation;
  10  * the contents of this file may not be disclosed to third parties, copied
  11  * or duplicated in any form, in whole or in part, without the prior
  12  * written permission of Broadcom Corporation.
  13  * $Id$
  14  */
  15
  16 #include <typedefs.h>
  17
  18 #ifdef BCMDRIVER
  19 #include <osl.h>
  20 #include <bcmutils.h>
  21 #define strtoul(nptr, endptr, base) bcm_strtoul((nptr), (endptr), (base))
  22 #define tolower(c) (bcm_isupper((c)) ? ((c) + 'a' - 'A') : (c))
  23 #else
  24 #include <stdio.h>
  25 #include <stdlib.h>
  26 #include <ctype.h>
  27 #endif /* BCMDRIVER */
  28 #include <bcmwifi.h>
  29
  30 /* Chanspec ASCII representation:
  31  * <channel><band><bandwidth><ctl-sideband>
  32  *   digit   [AB]      N          [UL]
  33  *
  34  * <channel>: channel number of the 10MHz or 20MHz channel,
  35  *      or control sideband channel of 40MHz channel.
  36  * <band>: A for 5GHz, B for 2.4GHz
  37  * <bandwidth>: N for 10MHz, nothing for 20MHz or 40MHz
  38  *      (ctl-sideband spec implies 40MHz)
  39  * <ctl-sideband>: U for upper, L for lower
  40  *
  41  * <band> may be omitted on input, and will be assumed to be
  42  * 2.4GHz if channel number <= 14.
  43  *
  44  * Examples: ...
  45  */
  46 /* given a chanspec and a string buffer, format the chanspec as a
  47  * string, and return the original pointer a. On error, return's NULL
  48  */
  49 char *
  50 wf_chspec_ntoa(chanspec_t chspec, char *buf)
  51 {
  52         const char *band, *bw, *sb;
  53         uint channel;
  54
  55         bw = "";
  56         sb = "";
  57         channel = CHSPEC_CHANNEL(chspec);
  58         band = (CHSPEC_IS2G(chspec)) ? "b" : "a";
  59         if (CHSPEC_IS40(chspec)) {
  60                 if (CHSPEC_SB_UPPER(chspec)) {
  61                         sb = "u";
  62                         channel += CH_10MHZ_APART;
  63                 } else {
  64                         sb = "l";
  65                         channel -= CH_10MHZ_APART;
  66                 }
  67         } else if (CHSPEC_IS10(chspec)) {
  68                 bw = "n";
  69         }
  70
  71         sprintf(buf, "%d%s%s%s", channel, band, bw, sb);
  72         return (buf);
  73 }
  74
  75 /* given a chanspec string, convert to a chanspec.
  76  * On error, return 0
  77  */
  78
  79 chanspec_t
  80 wf_chspec_aton(char *a)
  81 {
  82         char *endp;
  83         uint channel, band, bw, ctl_sb;
  84         bool band_set = FALSE, bw_set = FALSE, ctl_sb_set = FALSE;
  85         int error = 0;
  86
  87         channel = strtoul(a, &endp, 10);
  88         if (endp == a)
  89                 return 0;
  90
  91         if (channel > MAXCHANNEL)
  92                 return 0;
  93
  94         band = ((channel <= WLC_MAX_2G_CHANNEL) ? WL_CHANSPEC_BAND_2G : WL_CHANSPEC_BAND_5G);
  95         bw = WL_CHANSPEC_BW_20;
  96         ctl_sb = WL_CHANSPEC_CTL_SB_NONE;
  97
  98         a = endp;
  99         while (*a != 0 && error != -1) {
 100                 switch (tolower((int)*a)) {
 101                         case 'a':
 102                         case 'b':
 103                                 if (!band_set) {
 104                                         band = (tolower((int)*a) == 'a') ?
 105                                                WL_CHANSPEC_BAND_5G : WL_CHANSPEC_BAND_2G;
 106                                         band_set = TRUE;
 107                                 } else {
 108                                         error = -1;
 109                                 }
 110                                 break;
 111                         case 'n':
 112                                 if (!bw_set) {
 113                                         bw = WL_CHANSPEC_BW_10;
 114                                         bw_set = TRUE;
 115                                 } else {
 116                                         error = -1;
 117                                 }
 118                                 break;
 119                         case 'l':
 120                         case 'u':
 121                                 if (!ctl_sb_set && !bw_set) {
 122                                         ctl_sb = (tolower((int)*a) == 'l') ?
 123                                                 WL_CHANSPEC_CTL_SB_LOWER : WL_CHANSPEC_CTL_SB_UPPER;
 124                                         ctl_sb_set = TRUE;
 125                                         if (ctl_sb == WL_CHANSPEC_CTL_SB_LOWER)
 126                                                 channel = UPPER_20_SB(channel);
 127                                         else
 128                                                 channel = LOWER_20_SB(channel);
 129                                         bw = WL_CHANSPEC_BW_40;
 130                                         bw_set = TRUE;
 131                                 } else if (bw_set) {
 132                                         error = -1;
 133                                 } else {
 134                                         error = -1;
 135                                 }
 136                                 break;
 137                         default:
 138                                 error = -1;
 139                                 break;
 140                 }
 141                 a++;
 142         }
 143
 144         if (bw_set && (bw == WL_CHANSPEC_BW_40) && !ctl_sb_set)
 145                 error = -1;
 146
 147         if (ctl_sb_set && !bw_set)
 148                 error = -1;
 149
 150         if (!error)
 151                 return ((channel | band | bw | ctl_sb));
 152
 153         return 0;
 154 }