Android Wi-Fi 获取RSSI的代码流程

fetchRssiAndLinkSpeedNative()
|WifiNative.signalPoll()
|//send "SIGNAL_POLL" to wpa_supplicant
|wpa_supplicant_signal_poll()
|wpa_drv_signal_poll()
|nl80211_signal_poll()
|nl80211_get_link_signal()
|nl80211_cmd()//send NL80211_CMD_GET_STATION command to 80211cfg
|nl80211_get_station()
|wlan_hdd_cfg80211_get_station()
|wlan_hdd_get_rssi()
|sme_GetRssi()
|csrGetRssi()
|//send eWNI_SME_GET_RSSI_REQ
|csrUpdateRssi()
|WLANTL_GetRssi()
|pRssi = pClientSTA->rssiAvg//pClientSTA->rssiAvg is updated in WLANTL_HSGetRSSI()
|sendRssiChangeBroadcast()//send WifiManager.RSSI_CHANGED_ACTION intent
//below function is called when receiving each frame (including data frame)
WLANTL_RxFrames() or WLANTL_RxCachedFrames()
|WLANTL_HSHandleRXFrame()
|WLANTL_HSGetRSSI()