2 * Copyright (c) 2007-2008 Atheros Communications Inc.
4 * Permission to use, copy, modify, and/or distribute this software for any
5 * purpose with or without fee is hereby granted, provided that the above
6 * copyright notice and this permission notice appear in all copies.
8 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 /* Module Name : cwm.c */
20 /* This module contains channel width related functions. */
25 /************************************************************************/
31 void zfCwmInit(zdev_t* dev) {
33 zmw_get_wlan_dev(dev);
35 switch (wd->wlanMode) {
37 wd->cwm.cw_mode = CWM_MODE2040;
38 wd->cwm.cw_width = CWM_WIDTH40;
39 wd->cwm.cw_enable = 1;
41 case ZM_MODE_INFRASTRUCTURE:
45 wd->cwm.cw_mode = CWM_MODE2040;
46 wd->cwm.cw_width = CWM_WIDTH20;
47 wd->cwm.cw_enable = 1;
53 void zfCoreCwmBusy(zdev_t* dev, u16_t busy)
56 zmw_get_wlan_dev(dev);
58 zm_msg1_mm(ZM_LV_0, "CwmBusy=", busy);
60 if(wd->cwm.cw_mode == CWM_MODE20) {
61 wd->cwm.cw_width = CWM_WIDTH20;
65 if(wd->cwm.cw_mode == CWM_MODE40) {
66 wd->cwm.cw_width = CWM_WIDTH40;
71 wd->cwm.cw_width = CWM_WIDTH20;
76 if((wd->wlanMode == ZM_MODE_INFRASTRUCTURE || wd->wlanMode == ZM_MODE_PSEUDO ||
77 wd->wlanMode == ZM_MODE_IBSS)) {
78 if (wd->sta.ie.HtCap.HtCapInfo && HTCAP_SupChannelWidthSet != 0 &&
79 wd->sta.ie.HtInfo.ChannelInfo && ExtHtCap_RecomTxWidthSet != 0 &&
80 (wd->sta.ie.HtInfo.ChannelInfo && ExtHtCap_ExtChannelOffsetAbove) == 1) {
82 wd->cwm.cw_width = CWM_WIDTH40;
85 wd->cwm.cw_width = CWM_WIDTH20;
91 if(wd->wlanMode == ZM_MODE_AP) {
92 wd->cwm.cw_width = CWM_WIDTH40;
100 u16_t zfCwmIsExtChanBusy(u32_t ctlBusy, u32_t extBusy)
102 u32_t busy; /* percentage */
103 u32_t cycleTime, ctlClear;
105 cycleTime = 1280000; //1.28 seconds
107 if (cycleTime > ctlBusy) {
108 ctlClear = cycleTime - ctlBusy;
115 /* Compute ratio of extension channel busy to control channel clear
116 * as an approximation to extension channel cleanliness.
118 * According to the hardware folks, ext rxclear is undefined
119 * if the ctrl rxclear is de-asserted (i.e. busy)
122 busy = (extBusy * 100) / ctlClear;
126 if (busy > ATH_CWM_EXTCH_BUSY_THRESHOLD) {