projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 4bd43f50 LR |
1 | /* |
| 2 | * Copyright (c) 2007-2008 Atheros Communications Inc. | |
| 3 | * | |
| 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. | |
| 7 | * | |
| 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. | |
| 15 | */ | |
| 16 | /* */ | |
| 17 | /* Module Name : cwm.c */ | |
| 18 | /* */ | |
| 19 | /* Abstract */ | |
| 20 | /* This module contains channel width related functions. */ | |
| 21 | /* */ | |
| 22 | /* NOTES */ | |
| 23 | /* None */ | |
| 24 | /* */ | |
| 25 | /************************************************************************/ | |
| 26 | ||
| 27 | #include "cprecomp.h" | |
| 28 | ||
| 29 | ||
| 30 | ||
| 31 | void zfCwmInit(zdev_t* dev) { | |
| 32 | //u16_t i; | |
| 33 | zmw_get_wlan_dev(dev); | |
| 34 | ||
| 35 | switch (wd->wlanMode) { | |
| 36 | case ZM_MODE_AP: | |
| 37 | wd->cwm.cw_mode = CWM_MODE2040; | |
| 38 | wd->cwm.cw_width = CWM_WIDTH40; | |
| 39 | wd->cwm.cw_enable = 1; | |
| 40 | break; | |
| 41 | case ZM_MODE_INFRASTRUCTURE: | |
| 42 | case ZM_MODE_PSEUDO: | |
| 43 | case ZM_MODE_IBSS: | |
| 44 | default: | |
| 45 | wd->cwm.cw_mode = CWM_MODE2040; | |
| 46 | wd->cwm.cw_width = CWM_WIDTH20; | |
| 47 | wd->cwm.cw_enable = 1; | |
| 48 | break; | |
| 49 | } | |
| 50 | } | |
| 51 | ||
| 52 | ||
| 53 | void zfCoreCwmBusy(zdev_t* dev, u16_t busy) | |
| 54 | { | |
| 55 | ||
| 56 | zmw_get_wlan_dev(dev); | |
| 57 | ||
| 58 | zm_msg1_mm(ZM_LV_0, "CwmBusy=", busy); | |
| 59 | ||
| 60 | if(wd->cwm.cw_mode == CWM_MODE20) { | |
| 61 | wd->cwm.cw_width = CWM_WIDTH20; | |
| 62 | return; | |
| 63 | } | |
| 64 | ||
| 65 | if(wd->cwm.cw_mode == CWM_MODE40) { | |
| 66 | wd->cwm.cw_width = CWM_WIDTH40; | |
| 67 | return; | |
| 68 | } | |
| 69 | ||
| 70 | if (busy) { | |
| 71 | wd->cwm.cw_width = CWM_WIDTH20; | |
| 72 | return; | |
| 73 | } | |
| 74 | ||
| 75 | ||
| 76 | if((wd->wlanMode == ZM_MODE_INFRASTRUCTURE || wd->wlanMode == ZM_MODE_PSEUDO || | |
| 77 | wd->wlanMode == ZM_MODE_IBSS)) { | |
| 1472dc9b RK |
78 | if ((wd->sta.ie.HtCap.HtCapInfo & HTCAP_SupChannelWidthSet) && |
| 79 | (wd->sta.ie.HtInfo.ChannelInfo & ExtHtCap_RecomTxWidthSet) && | |
| 80 | (wd->sta.ie.HtInfo.ChannelInfo & ExtHtCap_ExtChannelOffsetAbove)) { | |
| 4bd43f50 LR |
81 | |
| 82 | wd->cwm.cw_width = CWM_WIDTH40; | |
| 83 | } | |
| 84 | else { | |
| 85 | wd->cwm.cw_width = CWM_WIDTH20; | |
| 86 | } | |
| 87 | ||
| 88 | return; | |
| 89 | } | |
| 90 | ||
| 91 | if(wd->wlanMode == ZM_MODE_AP) { | |
| 92 | wd->cwm.cw_width = CWM_WIDTH40; | |
| 93 | } | |
| 94 | ||
| 95 | } | |
| 96 | ||
| 97 | ||
| 98 | ||
| 99 | ||
| 100 | u16_t zfCwmIsExtChanBusy(u32_t ctlBusy, u32_t extBusy) | |
| 101 | { | |
| 102 | u32_t busy; /* percentage */ | |
| 103 | u32_t cycleTime, ctlClear; | |
| 104 | ||
| 105 | cycleTime = 1280000; //1.28 seconds | |
| 106 | ||
| 107 | if (cycleTime > ctlBusy) { | |
| 108 | ctlClear = cycleTime - ctlBusy; | |
| 109 | } | |
| 110 | else | |
| 111 | { | |
| 112 | ctlClear = 0; | |
| 113 | } | |
| 114 | ||
| 115 | /* Compute ratio of extension channel busy to control channel clear | |
| 116 | * as an approximation to extension channel cleanliness. | |
| 117 | * | |
| 118 | * According to the hardware folks, ext rxclear is undefined | |
| 119 | * if the ctrl rxclear is de-asserted (i.e. busy) | |
| 120 | */ | |
| 121 | if (ctlClear) { | |
| 122 | busy = (extBusy * 100) / ctlClear; | |
| 123 | } else { | |
| 124 | busy = 0; | |
| 125 | } | |
| 126 | if (busy > ATH_CWM_EXTCH_BUSY_THRESHOLD) { | |
| 127 | return TRUE; | |
| 128 | } | |
| 129 | ||
| 130 | return FALSE; | |
| 131 | } |