[PATCH] wireless/airo: WEXT and quality corrections

This patch brings the airo driver into line with the current
WEXT specification of signal quality.  It also fixes the values
used to determine signal quality and level for MPI & PCMCIA 350
cards.  It turns out that BSSListRid.rssi was actually in dBm
for 350 series cards, and that we can use the normalized
signal strength reported by the card as our "quality" value, on
a scale of 0 - 100.  Since signal level values are in dBm for
this driver, max_qual->level MUST be 0, as specified in the WEXT
spec.  This patch also uses the IW_QUAL constants new in WEXT
version 17.
Signed-off-by: Dan Williams <dcbw@redhat.com>

drivers/net/wireless/airo.c

@@ -754,7 +754,7 @@ typedef struct {
   u8 zero;
   u8 ssidLen;
   u8 ssid[32];
-  u16 rssi;
+  u16 dBm;
 #define CAP_ESS (1<<0)
 #define CAP_IBSS (1<<1)
 #define CAP_PRIVACY (1<<4)
@@ -1125,6 +1125,9 @@ static int micsetup(struct airo_info *ai);
 static int encapsulate(struct airo_info *ai, etherHead *pPacket, MICBuffer *buffer, int len);
 static int decapsulate(struct airo_info *ai, MICBuffer *mic, etherHead *pPacket, u16 payLen);
 
+static u8 airo_rssi_to_dbm (tdsRssiEntry *rssi_rid, u8 rssi);
+static u8 airo_dbm_to_pct (tdsRssiEntry *rssi_rid, u8 dbm);
+
 #include <linux/crypto.h>
 #endif
 
@@ -1713,6 +1716,7 @@ static int readBSSListRid(struct airo_info *ai, int first,
 	list->fh.dwell = le16_to_cpu(list->fh.dwell);
 	list->dsChannel = le16_to_cpu(list->dsChannel);
 	list->atimWindow = le16_to_cpu(list->atimWindow);
+	list->dBm = le16_to_cpu(list->dBm);
 	return rc;
 }
 
@@ -3245,7 +3249,10 @@ static irqreturn_t airo_interrupt ( int irq, void* dev_id, struct pt_regs *regs)
 					wstats.level = 0x100 - apriv->rssi[hdr.rssi[1]].rssidBm;
 				else
 					wstats.level = (hdr.rssi[1] + 321) / 2;
-				wstats.updated = 3;	
+				wstats.noise = apriv->wstats.qual.noise;
+				wstats.updated = IW_QUAL_LEVEL_UPDATED
+					| IW_QUAL_QUAL_UPDATED
+					| IW_QUAL_NOISE_UPDATED;
 				/* Update spy records */
 				wireless_spy_update(dev, sa, &wstats);
 			}
@@ -3588,7 +3595,10 @@ void mpi_receive_802_11 (struct airo_info *ai)
 			wstats.level = 0x100 - ai->rssi[hdr.rssi[1]].rssidBm;
 		else
 			wstats.level = (hdr.rssi[1] + 321) / 2;
-		wstats.updated = 3;
+		wstats.noise = ai->wstats.qual.noise;
+		wstats.updated = IW_QUAL_QUAL_UPDATED
+			| IW_QUAL_LEVEL_UPDATED
+			| IW_QUAL_NOISE_UPDATED;
 		/* Update spy records */
 		wireless_spy_update(ai->dev, sa, &wstats);
 	}
@@ -3679,7 +3689,7 @@ static u16 setup_card(struct airo_info *ai, u8 *mac, int lock)
 		status = PC4500_readrid(ai,RID_RSSI,&rssi_rid,sizeof(rssi_rid),lock);
 		if ( status == SUCCESS ) {
 			if (ai->rssi || (ai->rssi = kmalloc(512, GFP_KERNEL)) != NULL)
-				memcpy(ai->rssi, (u8*)&rssi_rid + 2, 512);
+				memcpy(ai->rssi, (u8*)&rssi_rid + 2, 512); /* Skip RID length member */
 		}
 		else {
 			if (ai->rssi) {
@@ -5348,7 +5358,7 @@ static int proc_BSSList_open( struct inode *inode, struct file *file ) {
 				(int)BSSList_rid.bssid[5],
 				(int)BSSList_rid.ssidLen,
 				BSSList_rid.ssid,
-				(int)BSSList_rid.rssi);
+				(int)BSSList_rid.dBm);
 		ptr += sprintf(ptr, " channel = %d %s %s %s %s\n",
 				(int)BSSList_rid.dsChannel,
 				BSSList_rid.cap & CAP_ESS ? "ESS" : "",
@@ -5593,6 +5603,29 @@ static void __exit airo_cleanup_module( void )
  * would not work at all... - Jean II
  */
 
+static u8 airo_rssi_to_dbm (tdsRssiEntry *rssi_rid, u8 rssi)
+{
+	if( !rssi_rid )
+		return 0;
+
+	return (0x100 - rssi_rid[rssi].rssidBm);
+}
+
+static u8 airo_dbm_to_pct (tdsRssiEntry *rssi_rid, u8 dbm)
+{
+	int i;
+
+	if( !rssi_rid )
+		return 0;
+
+	for( i = 0; i < 256; i++ )
+		if (rssi_rid[i].rssidBm == dbm)
+			return rssi_rid[i].rssipct;
+
+	return 0;
+}
+
+
 static int airo_get_quality (StatusRid *status_rid, CapabilityRid *cap_rid)
 {
 	int quality = 0;
@@ -6443,11 +6476,29 @@ static int airo_get_range(struct net_device *dev,
 	}
 	range->num_frequency = k;
 
+	range->sensitivity = 65535;
+
 	/* Hum... Should put the right values there */
+	if (local->rssi)
+		range->max_qual.qual = 100;	/* % */
+	else
 		range->max_qual.qual = airo_get_max_quality(&cap_rid);
-	range->max_qual.level = 0x100 - 120;	/* -120 dBm */
+	range->max_qual.level = 0;	/* 0 means we use dBm  */
 	range->max_qual.noise = 0;
-	range->sensitivity = 65535;
+	range->max_qual.updated = 0;
+
+	/* Experimental measurements - boundary 11/5.5 Mb/s */
+	/* Note : with or without the (local->rssi), results
+	 * are somewhat different. - Jean II */
+	if (local->rssi) {
+		range->avg_qual.qual = 50;	/* % */
+		range->avg_qual.level = 186;	/* -70 dBm */
+	} else {
+		range->avg_qual.qual = airo_get_avg_quality(&cap_rid);
+		range->avg_qual.level = 176;	/* -80 dBm */
+	}
+	range->avg_qual.noise = 0;
+	range->avg_qual.updated = 0;
 
 	for(i = 0 ; i < 8 ; i++) {
 		range->bitrate[i] = cap_rid.supportedRates[i] * 500000;
@@ -6508,15 +6559,6 @@ static int airo_get_range(struct net_device *dev,
 	range->max_retry = 65535;
 	range->min_r_time = 1024;
 	range->max_r_time = 65535 * 1024;
-	/* Experimental measurements - boundary 11/5.5 Mb/s */
-	/* Note : with or without the (local->rssi), results
-	 * are somewhat different. - Jean II */
-	range->avg_qual.qual = airo_get_avg_quality(&cap_rid);
-	if (local->rssi)
-		range->avg_qual.level = 186;	/* -70 dBm */
-	else
-		range->avg_qual.level = 176;	/* -80 dBm */
-	range->avg_qual.noise = 0;
 
 	/* Event capability (kernel + driver) */
 	range->event_capa[0] = (IW_EVENT_CAPA_K_0 |
@@ -6676,12 +6718,18 @@ static int airo_get_aplist(struct net_device *dev,
 		loseSync = 0;
 		memcpy(address[i].sa_data, BSSList.bssid, ETH_ALEN);
 		address[i].sa_family = ARPHRD_ETHER;
-		if (local->rssi)
-			qual[i].level = 0x100 - local->rssi[BSSList.rssi].rssidBm;
-		else
-			qual[i].level = (BSSList.rssi + 321) / 2;
-		qual[i].qual = qual[i].noise = 0;
-		qual[i].updated = 2;
+		if (local->rssi) {
+			qual[i].level = 0x100 - BSSList.dBm;
+			qual[i].qual = airo_dbm_to_pct( local->rssi, BSSList.dBm );
+			qual[i].updated = IW_QUAL_QUAL_UPDATED;
+		} else {
+			qual[i].level = (BSSList.dBm + 321) / 2;
+			qual[i].qual = 0;
+			qual[i].updated = IW_QUAL_QUAL_INVALID;
+		}
+		qual[i].noise = local->wstats.qual.noise;
+		qual[i].updated = IW_QUAL_LEVEL_UPDATED
+				| IW_QUAL_NOISE_UPDATED;
 		if (BSSList.index == 0xffff)
 			break;
 	}
@@ -6760,7 +6808,7 @@ static int airo_set_scan(struct net_device *dev,
 static inline char *airo_translate_scan(struct net_device *dev,
 					char *current_ev,
 					char *end_buf,
-					BSSListRid *list)
+					BSSListRid *bss)
 {
 	struct airo_info *ai = dev->priv;
 	struct iw_event		iwe;		/* Temporary buffer */
@@ -6771,22 +6819,22 @@ static inline char *airo_translate_scan(struct net_device *dev,
 	/* First entry *MUST* be the AP MAC address */
 	iwe.cmd = SIOCGIWAP;
 	iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
-	memcpy(iwe.u.ap_addr.sa_data, list->bssid, ETH_ALEN);
+	memcpy(iwe.u.ap_addr.sa_data, bss->bssid, ETH_ALEN);
 	current_ev = iwe_stream_add_event(current_ev, end_buf, &iwe, IW_EV_ADDR_LEN);
 
 	/* Other entries will be displayed in the order we give them */
 
 	/* Add the ESSID */
-	iwe.u.data.length = list->ssidLen;
+	iwe.u.data.length = bss->ssidLen;
 	if(iwe.u.data.length > 32)
 		iwe.u.data.length = 32;
 	iwe.cmd = SIOCGIWESSID;
 	iwe.u.data.flags = 1;
-	current_ev = iwe_stream_add_point(current_ev, end_buf, &iwe, list->ssid);
+	current_ev = iwe_stream_add_point(current_ev, end_buf, &iwe, bss->ssid);
 
 	/* Add mode */
 	iwe.cmd = SIOCGIWMODE;
-	capabilities = le16_to_cpu(list->cap);
+	capabilities = le16_to_cpu(bss->cap);
 	if(capabilities & (CAP_ESS | CAP_IBSS)) {
 		if(capabilities & CAP_ESS)
 			iwe.u.mode = IW_MODE_MASTER;
@@ -6797,19 +6845,25 @@ static inline char *airo_translate_scan(struct net_device *dev,
 
 	/* Add frequency */
 	iwe.cmd = SIOCGIWFREQ;
-	iwe.u.freq.m = le16_to_cpu(list->dsChannel);
+	iwe.u.freq.m = le16_to_cpu(bss->dsChannel);
 	iwe.u.freq.m = frequency_list[iwe.u.freq.m] * 100000;
 	iwe.u.freq.e = 1;
 	current_ev = iwe_stream_add_event(current_ev, end_buf, &iwe, IW_EV_FREQ_LEN);
 
 	/* Add quality statistics */
 	iwe.cmd = IWEVQUAL;
-	if (ai->rssi)
-		iwe.u.qual.level = 0x100 - ai->rssi[list->rssi].rssidBm;
-	else
-		iwe.u.qual.level = (list->rssi + 321) / 2;
-	iwe.u.qual.noise = 0;
+	if (ai->rssi) {
+		iwe.u.qual.level = 0x100 - bss->dBm;
+		iwe.u.qual.qual = airo_dbm_to_pct( ai->rssi, bss->dBm );
+		iwe.u.qual.updated = IW_QUAL_QUAL_UPDATED;
+	} else {
+		iwe.u.qual.level = (bss->dBm + 321) / 2;
 		iwe.u.qual.qual = 0;
+		iwe.u.qual.updated = IW_QUAL_QUAL_INVALID;
+	}
+	iwe.u.qual.noise = ai->wstats.qual.noise;
+	iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED
+			| IW_QUAL_NOISE_UPDATED;
 	current_ev = iwe_stream_add_event(current_ev, end_buf, &iwe, IW_EV_QUAL_LEN);
 
 	/* Add encryption capability */
@@ -6819,7 +6873,7 @@ static inline char *airo_translate_scan(struct net_device *dev,
 	else
 		iwe.u.data.flags = IW_ENCODE_DISABLED;
 	iwe.u.data.length = 0;
-	current_ev = iwe_stream_add_point(current_ev, end_buf, &iwe, list->ssid);
+	current_ev = iwe_stream_add_point(current_ev, end_buf, &iwe, bss->ssid);
 
 	/* Rate : stuffing multiple values in a single event require a bit
 	 * more of magic - Jean II */
@@ -6831,10 +6885,10 @@ static inline char *airo_translate_scan(struct net_device *dev,
 	/* Max 8 values */
 	for(i = 0 ; i < 8 ; i++) {
 		/* NULL terminated */
-		if(list->rates[i] == 0)
+		if(bss->rates[i] == 0)
 			break;
 		/* Bit rate given in 500 kb/s units (+ 0x80) */
-		iwe.u.bitrate.value = ((list->rates[i] & 0x7f) * 500000);
+		iwe.u.bitrate.value = ((bss->rates[i] & 0x7f) * 500000);
 		/* Add new value to event */
 		current_val = iwe_stream_add_value(current_ev, current_val, end_buf, &iwe, IW_EV_PARAM_LEN);
 	}
@@ -7153,18 +7207,22 @@ static void airo_read_wireless_stats(struct airo_info *local)
 	/* The status */
 	local->wstats.status = status_rid.mode;
 
-	/* Signal quality and co. But where is the noise level ??? */
-	local->wstats.qual.qual = airo_get_quality(&status_rid, &cap_rid);
-	if (local->rssi)
-		local->wstats.qual.level = 0x100 - local->rssi[status_rid.sigQuality].rssidBm;
-	else
+	/* Signal quality and co */
+	if (local->rssi) {
+		local->wstats.qual.level = airo_rssi_to_dbm( local->rssi, status_rid.sigQuality );
+		/* normalizedSignalStrength appears to be a percentage */
+		local->wstats.qual.qual = status_rid.normalizedSignalStrength;
+	} else {
 		local->wstats.qual.level = (status_rid.normalizedSignalStrength + 321) / 2;
+		local->wstats.qual.qual = airo_get_quality(&status_rid, &cap_rid);
+	}
+	local->wstats.qual.updated = IW_QUAL_QUAL_UPDATED | IW_QUAL_LEVEL_UPDATED;
 	if (status_rid.len >= 124) {
-		local->wstats.qual.noise = 256 - status_rid.noisedBm;
-		local->wstats.qual.updated = 7;
+		local->wstats.qual.noise = 0x100 - status_rid.noisedBm;
+		local->wstats.qual.updated |= IW_QUAL_NOISE_UPDATED;
 	} else {
 		local->wstats.qual.noise = 0;
-		local->wstats.qual.updated = 3;
+		local->wstats.qual.updated |= IW_QUAL_NOISE_INVALID;
 	}
 
 	/* Packets discarded in the wireless adapter due to wireless