Fix noise sign and return code (#834)

* Return 6 instead of kIOReturnError when not connected

* Noise should be negative. Positive noise means that noise is MUCH stronger than signal.

* Remove unneeded macro

Co-authored-by: Michael Belyaev <usrsse2@me.com>

AirportItlwm/AirportSTAIOCTL.cpp

@@ -225,7 +225,7 @@ getSSID(OSObject *object,
         sd->ssid_len = (uint32_t)strlen((const char*)ic->ic_des_essid);
         return kIOReturnSuccess;
     }
-    return kIOReturnError;
+    return 6;
 }
 
 IOReturn AirportItlwm::
@@ -376,7 +376,7 @@ getCHANNEL(OSObject *object,
         cd->channel.flags = ieeeChanFlag2apple(ic->ic_bss->ni_chan->ic_flags, ic->ic_bss->ni_chw);
         return kIOReturnSuccess;
     }
-    return kIOReturnError;
+    return 6;
 }
 
 IOReturn AirportItlwm::
@@ -397,7 +397,7 @@ getPROTMODE(OSObject *object, struct apple80211_protmode_data *pd)
         pd->protmode = 0;
         return kIOReturnSuccess;
     }
-    return kIOReturnError;
+    return 6;
 }
 
 IOReturn AirportItlwm::
@@ -418,7 +418,7 @@ getTXPOWER(OSObject *object,
         txd->txpower_unit = APPLE80211_UNIT_PERCENT;
         return kIOReturnSuccess;
     }
-    return kIOReturnError;
+    return 6;
 }
 
 IOReturn AirportItlwm::
@@ -457,7 +457,7 @@ getRATE(OSObject *object, struct apple80211_rate_data *rd)
 {
     struct ieee80211com *ic = fHalService->get80211Controller();
     if (ic->ic_bss == NULL)
-        return kIOReturnError;
+        return 6;
     int nss;
     int sgi;
     int index = 0;
@@ -502,7 +502,7 @@ getRATE(OSObject *object, struct apple80211_rate_data *rd)
             rd->rate[0] = ic->ic_bss->ni_rates.rs_rates[ic->ic_bss->ni_txrate];
         return kIOReturnSuccess;
     }
-    return kIOReturnError;
+    return 6;
 }
 
 IOReturn AirportItlwm::
@@ -638,7 +638,7 @@ getBSSID(OSObject *object,
         memcpy(bd->bssid.octet, ic->ic_bss->ni_bssid, APPLE80211_ADDR_LEN);
         return kIOReturnSuccess;
     }
-    return kIOReturnError;
+    return 6;
 }
 
 IOReturn AirportItlwm::
@@ -722,7 +722,7 @@ getMCS_INDEX_SET(OSObject *object, struct apple80211_mcs_index_set_data *ad)
             ad->mcs_set_map[i] = ic->ic_bss->ni_rxmcs[i];
         return kIOReturnSuccess;
     }
-    return kIOReturnError;
+    return 6;
 }
 
 IOReturn AirportItlwm::
@@ -793,7 +793,7 @@ getRATE_SET(OSObject *object, struct apple80211_rate_set_data *ad)
         }
         return kIOReturnSuccess;
     }
-    return kIOReturnError;
+    return 6;
 }
 
 IOReturn AirportItlwm::
@@ -869,7 +869,7 @@ getRSSI(OSObject *object,
         = -(0 - IWM_MIN_DBM - ic->ic_bss->ni_rssi);
         return kIOReturnSuccess;
     }
-    return kIOReturnError;
+    return 6;
 }
 
 IOReturn AirportItlwm::
@@ -940,11 +940,11 @@ getNOISE(OSObject *object,
         nd->version = APPLE80211_VERSION;
         nd->num_radios = 1;
         nd->noise[0]
-        = nd->aggregate_noise = fHalService->getDriverInfo()->getBSSNoise();
+        = nd->aggregate_noise = -fHalService->getDriverInfo()->getBSSNoise();
         nd->noise_unit = APPLE80211_UNIT_DBM;
         return kIOReturnSuccess;
     }
-    return kIOReturnError;
+    return 6;
 }
 
 IOReturn AirportItlwm::
@@ -1166,30 +1166,27 @@ setDEAUTH(OSObject *object,
 void AirportItlwm::
 eventHandler(struct ieee80211com *ic, int msgCode, void *data)
 {
-#define INTERFACE_POST_MESSAGE(code) \
-    if (interface) { \
-        interface->postMessage(code); \
-    }
     IO80211Interface *interface = OSDynamicCast(IO80211Interface, ic->ic_ac.ac_if.iface);
+    if (!interface)
+        return;
     switch (msgCode) {
         case IEEE80211_EVT_COUNTRY_CODE_UPDATE:
-            INTERFACE_POST_MESSAGE(APPLE80211_M_COUNTRY_CODE_CHANGED)
+            interface->postMessage(APPLE80211_M_COUNTRY_CODE_CHANGED);
             break;
         case IEEE80211_EVT_STA_ASSOC_DONE:
-            INTERFACE_POST_MESSAGE(APPLE80211_M_ASSOC_DONE)
+            interface->postMessage(APPLE80211_M_ASSOC_DONE);
             break;
         case IEEE80211_EVT_STA_DEAUTH:
-            INTERFACE_POST_MESSAGE(APPLE80211_M_DEAUTH_RECEIVED)
+            interface->postMessage(APPLE80211_M_DEAUTH_RECEIVED);
             break;
 #if 0
         case IEEE80211_EVT_SCAN_DONE:
-            INTERFACE_POST_MESSAGE(APPLE80211_M_SCAN_DONE)
+            interface->postMessage(APPLE80211_M_SCAN_DONE);
             break;
 #endif
         default:
             break;
     }
-#undef INTERFACE_POST_MESSAGE
 }
 
 IOReturn AirportItlwm::
@@ -1274,7 +1271,7 @@ getMCS(OSObject *object, struct apple80211_mcs_data* md)
 {
     struct ieee80211com *ic = fHalService->get80211Controller();
     if (ic->ic_state != IEEE80211_S_RUN ||  ic->ic_bss == NULL || !md)
-        return kIOReturnError;
+        return 6;
     md->version = APPLE80211_VERSION;
     md->index = ic->ic_bss->ni_txmcs;
     return kIOReturnSuccess;
@@ -1408,7 +1405,7 @@ getSCAN_RESULT(OSObject *object, struct apple80211_scan_result **sr)
     result->asr_channel.version = APPLE80211_VERSION;
     result->asr_channel.channel = ieee80211_chan2ieee(ic, fNextNodeToSend->ni_chan);
     result->asr_channel.flags = ieeeChanFlag2apple(fNextNodeToSend->ni_chan->ic_flags, -1);
-    result->asr_noise = fHalService->getDriverInfo()->getBSSNoise();
+    result->asr_noise = -fHalService->getDriverInfo()->getBSSNoise();
     result->asr_rssi = -(0 - IWM_MIN_DBM - fNextNodeToSend->ni_rssi);
     memcpy(result->asr_bssid, fNextNodeToSend->ni_bssid, IEEE80211_ADDR_LEN);
     result->asr_ssid_len = fNextNodeToSend->ni_esslen;