diff options
Diffstat (limited to 'drivers/staging/otus/80211core/cwm.c')
-rw-r--r-- | drivers/staging/otus/80211core/cwm.c | 131 |
1 files changed, 131 insertions, 0 deletions
diff --git a/drivers/staging/otus/80211core/cwm.c b/drivers/staging/otus/80211core/cwm.c new file mode 100644 index 00000000000..80f1141bf91 --- /dev/null +++ b/drivers/staging/otus/80211core/cwm.c @@ -0,0 +1,131 @@ +/* + * Copyright (c) 2007-2008 Atheros Communications Inc. + * + * Permission to use, copy, modify, and/or distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice appear in all copies. + * + * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES + * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR + * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES + * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN + * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF + * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. + */ +/* */ +/* Module Name : cwm.c */ +/* */ +/* Abstract */ +/* This module contains channel width related functions. */ +/* */ +/* NOTES */ +/* None */ +/* */ +/************************************************************************/ + +#include "cprecomp.h" + + + +void zfCwmInit(zdev_t* dev) { + //u16_t i; + zmw_get_wlan_dev(dev); + + switch (wd->wlanMode) { + case ZM_MODE_AP: + wd->cwm.cw_mode = CWM_MODE2040; + wd->cwm.cw_width = CWM_WIDTH40; + wd->cwm.cw_enable = 1; + break; + case ZM_MODE_INFRASTRUCTURE: + case ZM_MODE_PSEUDO: + case ZM_MODE_IBSS: + default: + wd->cwm.cw_mode = CWM_MODE2040; + wd->cwm.cw_width = CWM_WIDTH20; + wd->cwm.cw_enable = 1; + break; + } +} + + +void zfCoreCwmBusy(zdev_t* dev, u16_t busy) +{ + + zmw_get_wlan_dev(dev); + + zm_msg1_mm(ZM_LV_0, "CwmBusy=", busy); + + if(wd->cwm.cw_mode == CWM_MODE20) { + wd->cwm.cw_width = CWM_WIDTH20; + return; + } + + if(wd->cwm.cw_mode == CWM_MODE40) { + wd->cwm.cw_width = CWM_WIDTH40; + return; + } + + if (busy) { + wd->cwm.cw_width = CWM_WIDTH20; + return; + } + + + if((wd->wlanMode == ZM_MODE_INFRASTRUCTURE || wd->wlanMode == ZM_MODE_PSEUDO || + wd->wlanMode == ZM_MODE_IBSS)) { + if (wd->sta.ie.HtCap.HtCapInfo && HTCAP_SupChannelWidthSet != 0 && + wd->sta.ie.HtInfo.ChannelInfo && ExtHtCap_RecomTxWidthSet != 0 && + (wd->sta.ie.HtInfo.ChannelInfo && ExtHtCap_ExtChannelOffsetAbove) == 1) { + + wd->cwm.cw_width = CWM_WIDTH40; + } + else { + wd->cwm.cw_width = CWM_WIDTH20; + } + + return; + } + + if(wd->wlanMode == ZM_MODE_AP) { + wd->cwm.cw_width = CWM_WIDTH40; + } + +} + + + + +u16_t zfCwmIsExtChanBusy(u32_t ctlBusy, u32_t extBusy) +{ + u32_t busy; /* percentage */ + u32_t cycleTime, ctlClear; + + cycleTime = 1280000; //1.28 seconds + + if (cycleTime > ctlBusy) { + ctlClear = cycleTime - ctlBusy; + } + else + { + ctlClear = 0; + } + + /* Compute ratio of extension channel busy to control channel clear + * as an approximation to extension channel cleanliness. + * + * According to the hardware folks, ext rxclear is undefined + * if the ctrl rxclear is de-asserted (i.e. busy) + */ + if (ctlClear) { + busy = (extBusy * 100) / ctlClear; + } else { + busy = 0; + } + if (busy > ATH_CWM_EXTCH_BUSY_THRESHOLD) { + return TRUE; + } + + return FALSE; +} |