[PATCH] ieee80211: export list of bit rates with standard WEXT procddures

The patch replace the way to export the list of bit rates in scan results
from IWEVCUSTOM to SIOCGIWRATE. It also removes the max_rate item exported
with SIOCGIWRATE since this should be done by userspace.
Signed-off-by: NJean Tourrilhes <jt@hpl.hp.com>
Signed-off-by: NZhu Yi <yi.zhu@intel.com>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

net/ieee80211/ieee80211_wx.c

@@ -50,7 +50,8 @@ static char *ieee80211_translate_scan(struct ieee80211_device *ieee,
 	char *p;
 	struct iw_event iwe;
 	int i, j;
-	u8 max_rate, rate;
+	char *current_val;	/* For rates */
+	u8 rate;
 
 	/* First entry *MUST* be the AP MAC address */
 	iwe.cmd = SIOCGIWAP;
@@ -107,9 +108,13 @@ static char *ieee80211_translate_scan(struct ieee80211_device *ieee,
 	start = iwe_stream_add_point(start, stop, &iwe, network->ssid);
 
 	/* Add basic and extended rates */
-	max_rate = 0;
-	p = custom;
-	p += snprintf(p, MAX_CUSTOM_LEN - (p - custom), " Rates (Mb/s): ");
+	/* Rate : stuffing multiple values in a single event require a bit
+	 * more of magic - Jean II */
+	current_val = start + IW_EV_LCP_LEN;
+	iwe.cmd = SIOCGIWRATE;
+	/* Those two flags are ignored... */
+	iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0;
+
 	for (i = 0, j = 0; i < network->rates_len;) {
 		if (j < network->rates_ex_len &&
 		    ((network->rates_ex[j] & 0x7F) <
@@ -117,28 +122,21 @@ static char *ieee80211_translate_scan(struct ieee80211_device *ieee,
 			rate = network->rates_ex[j++] & 0x7F;
 		else
 			rate = network->rates[i++] & 0x7F;
-		if (rate > max_rate)
-			max_rate = rate;
-		p += snprintf(p, MAX_CUSTOM_LEN - (p - custom),
-			      "%d%s ", rate >> 1, (rate & 1) ? ".5" : "");
+		/* Bit rate given in 500 kb/s units (+ 0x80) */
+		iwe.u.bitrate.value = ((rate & 0x7f) * 500000);
+		/* Add new value to event */
+		current_val = iwe_stream_add_value(start, current_val, stop, &iwe, IW_EV_PARAM_LEN);
 	}
 	for (; j < network->rates_ex_len; j++) {
 		rate = network->rates_ex[j] & 0x7F;
-		p += snprintf(p, MAX_CUSTOM_LEN - (p - custom),
-			      "%d%s ", rate >> 1, (rate & 1) ? ".5" : "");
-		if (rate > max_rate)
-			max_rate = rate;
-	}
-
-	iwe.cmd = SIOCGIWRATE;
-	iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0;
-	iwe.u.bitrate.value = max_rate * 500000;
-	start = iwe_stream_add_event(start, stop, &iwe, IW_EV_PARAM_LEN);
-
-	iwe.cmd = IWEVCUSTOM;
-	iwe.u.data.length = p - custom;
-	if (iwe.u.data.length)
-		start = iwe_stream_add_point(start, stop, &iwe, custom);
+		/* Bit rate given in 500 kb/s units (+ 0x80) */
+		iwe.u.bitrate.value = ((rate & 0x7f) * 500000);
+		/* Add new value to event */
+		current_val = iwe_stream_add_value(start, current_val, stop, &iwe, IW_EV_PARAM_LEN);
+	}
+	/* Check if we added any rate */
+	if((current_val - start) > IW_EV_LCP_LEN)
+		start = current_val;
 
 	/* Add quality statistics */
 	iwe.cmd = IWEVQUAL;