[netspeed] Take maximum quality into account of quality calculation, if this can be queried from the driver; Fi

[Jörgen Scheibengruber <mfcn src gnome org>]

commit c95746608862d5426dd093c78885ccce6be1c218
Author: Jörgen Scheibengruber <mfcn gmx de>
Date:   Sat Jun 5 16:09:38 2010 +0300

    Take maximum quality into account of quality calculation, if this can be queried from the driver; Fixes #590561

 src/backend.c |   11 +++++++++--
 1 files changed, 9 insertions(+), 2 deletions(-)
---
diff --git a/src/backend.c b/src/backend.c
index d55c100..1f52f13 100644
--- a/src/backend.c
+++ b/src/backend.c
@@ -280,6 +280,7 @@ void
 get_wireless_info (DevInfo *devinfo)
 {
 	int fd;
+	int newqual;
 	wireless_info info = {0};
 
 	fd = iw_sockets_open ();
@@ -302,9 +303,15 @@ get_wireless_info (DevInfo *devinfo)
 		info.has_stats = 1;
 
 	if (info.has_stats) {
-		if (devinfo->qual != info.stats.qual.qual) {
-			devinfo->qual = info.stats.qual.qual;
+		if ((iw_get_range_info(fd, devinfo->name, &info.range) >= 0) && (info.range.max_qual.qual > 0)) {
+			newqual = 0.5f + (100.0f * info.stats.qual.qual) / (1.0f * info.range.max_qual.qual);
+		} else {
+			newqual = info.stats.qual.qual;
 		}
+		
+		newqual = CLAMP(newqual, 0, 100);
+		if (devinfo->qual != newqual)
+			devinfo->qual = newqual;
 	} else {
 		devinfo->qual = 0;
 	}