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 (C) 1999-2009, Broadcom Corporation 7 * 8 * Unless you and Broadcom execute a separate written software license 9 * agreement governing use of this software, this software is licensed to you 10 * under the terms of the GNU General Public License version 2 (the "GPL"), 11 * available at http://www.broadcom.com/licenses/GPLv2.php, with the 12 * following added to such license: 13 * 14 * As a special exception, the copyright holders of this software give you 15 * permission to link this software with independent modules, and to copy and 16 * distribute the resulting executable under terms of your choice, provided that 17 * you also meet, for each linked independent module, the terms and conditions of 18 * the license of that module. An independent module is a module which is not 19 * derived from this software. The special exception does not apply to any 20 * modifications of the software. 21 * 22 * Notwithstanding the above, under no circumstances may you combine this 23 * software in any way with any other Broadcom software provided under a license 24 * other than the GPL, without Broadcom's express prior written consent. 25 * $Id: bcmwifi.c,v 1.18.24.2.4.1 2009/09/25 00:32:01 Exp $ 26 */ 27 28 29 #include <typedefs.h> 30 31 #ifdef BCMDRIVER 32 #include <osl.h> 33 #include <bcmutils.h> 34 #define strtoul(nptr, endptr, base) bcm_strtoul((nptr), (endptr), (base)) 35 #define tolower(c) (bcm_isupper((c)) ? ((c) + 'a' - 'A') : (c)) 36 #else 37 #include <stdio.h> 38 #include <stdlib.h> 39 #include <ctype.h> 40 #endif 41 #include <bcmwifi.h> 42 43 #if defined(WIN32) && (defined(BCMDLL) || defined(WLMDLL)) 44 #include <bcmstdlib.h> 45 #endif 46 47 48 49 50 51 char * 52 wf_chspec_ntoa(chanspec_t chspec, char *buf) 53 { 54 const char *band, *bw, *sb; 55 uint channel; 56 57 band = ""; 58 bw = ""; 59 sb = ""; 60 channel = CHSPEC_CHANNEL(chspec); 61 62 if ((CHSPEC_IS2G(chspec) && channel > CH_MAX_2G_CHANNEL) || 63 (CHSPEC_IS5G(chspec) && channel <= CH_MAX_2G_CHANNEL)) 64 band = (CHSPEC_IS2G(chspec)) ? "b" : "a"; 65 if (CHSPEC_IS40(chspec)) { 66 if (CHSPEC_SB_UPPER(chspec)) { 67 sb = "u"; 68 channel += CH_10MHZ_APART; 69 } else { 70 sb = "l"; 71 channel -= CH_10MHZ_APART; 72 } 73 } else if (CHSPEC_IS10(chspec)) { 74 bw = "n"; 75 } 76 77 78 snprintf(buf, 6, "%d%s%s%s", channel, band, bw, sb); 79 return (buf); 80 } 81 82 83 chanspec_t 84 wf_chspec_aton(char *a) 85 { 86 char *endp = NULL; 87 uint channel, band, bw, ctl_sb; 88 char c; 89 90 channel = strtoul(a, &endp, 10); 91 92 93 if (endp == a) 94 return 0; 95 96 if (channel > MAXCHANNEL) 97 return 0; 98 99 band = ((channel <= CH_MAX_2G_CHANNEL) ? WL_CHANSPEC_BAND_2G : WL_CHANSPEC_BAND_5G); 100 bw = WL_CHANSPEC_BW_20; 101 ctl_sb = WL_CHANSPEC_CTL_SB_NONE; 102 103 a = endp; 104 105 c = tolower(a[0]); 106 if (c == '\0') 107 goto done; 108 109 110 if (c == 'a' || c == 'b') { 111 band = (c == 'a') ? WL_CHANSPEC_BAND_5G : WL_CHANSPEC_BAND_2G; 112 a++; 113 c = tolower(a[0]); 114 if (c == '\0') 115 goto done; 116 } 117 118 119 if (c == 'n') { 120 bw = WL_CHANSPEC_BW_10; 121 } else if (c == 'l') { 122 bw = WL_CHANSPEC_BW_40; 123 ctl_sb = WL_CHANSPEC_CTL_SB_LOWER; 124 125 if (channel <= (MAXCHANNEL - CH_20MHZ_APART)) 126 channel += CH_10MHZ_APART; 127 else 128 return 0; 129 } else if (c == 'u') { 130 bw = WL_CHANSPEC_BW_40; 131 ctl_sb = WL_CHANSPEC_CTL_SB_UPPER; 132 133 if (channel > CH_20MHZ_APART) 134 channel -= CH_10MHZ_APART; 135 else 136 return 0; 137 } else { 138 return 0; 139 } 140 141 done: 142 return (channel | band | bw | ctl_sb); 143 } 144 145 146 int 147 wf_mhz2channel(uint freq, uint start_factor) 148 { 149 int ch = -1; 150 uint base; 151 int offset; 152 153 154 if (start_factor == 0) { 155 if (freq >= 2400 && freq <= 2500) 156 start_factor = WF_CHAN_FACTOR_2_4_G; 157 else if (freq >= 5000 && freq <= 6000) 158 start_factor = WF_CHAN_FACTOR_5_G; 159 } 160 161 if (freq == 2484 && start_factor == WF_CHAN_FACTOR_2_4_G) 162 return 14; 163 164 base = start_factor / 2; 165 166 167 if ((freq < base) || (freq > base + 1000)) 168 return -1; 169 170 offset = freq - base; 171 ch = offset / 5; 172 173 174 if (offset != (ch * 5)) 175 return -1; 176 177 178 if (start_factor == WF_CHAN_FACTOR_2_4_G && (ch < 1 || ch > 13)) 179 return -1; 180 181 return ch; 182 } 183 184 185 int 186 wf_channel2mhz(uint ch, uint start_factor) 187 { 188 int freq; 189 190 if ((start_factor == WF_CHAN_FACTOR_2_4_G && (ch < 1 || ch > 14)) || 191 (ch <= 200)) 192 freq = -1; 193 if ((start_factor == WF_CHAN_FACTOR_2_4_G) && (ch == 14)) 194 freq = 2484; 195 else 196 freq = ch * 5 + start_factor / 2; 197 198 return freq; 199 } 200
