rt2x00: Add initial support for RT3370/RT3390 devices.

Modified from Eddy's patch by adding the RT3370 USB support as well.

Signed-off-by: Gertjan van Wingerde <gwingerde@gmail.com>
Cc: Eddy Tsai <Eddy_Tsai@ralinktech.com>
Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/rt2x00/rt2800lib.c b/drivers/net/wireless/rt2x00/rt2800lib.c
index b5d2eba..ce8df66 100644
--- a/drivers/net/wireless/rt2x00/rt2800lib.c
+++ b/drivers/net/wireless/rt2x00/rt2800lib.c
@@ -1544,7 +1544,8 @@
 	    rt2x00_rf(rt2x00dev, RF3020) ||
 	    rt2x00_rf(rt2x00dev, RF3021) ||
 	    rt2x00_rf(rt2x00dev, RF3022) ||
-	    rt2x00_rf(rt2x00dev, RF3052))
+	    rt2x00_rf(rt2x00dev, RF3052) ||
+	    rt2x00_rf(rt2x00dev, RF3320))
 		rt2800_config_channel_rf3xxx(rt2x00dev, conf, rf, info);
 	else
 		rt2800_config_channel_rf2xxx(rt2x00dev, conf, rf, info);
@@ -3012,7 +3013,8 @@
 	    !rt2x00_rf(rt2x00dev, RF2020) &&
 	    !rt2x00_rf(rt2x00dev, RF3021) &&
 	    !rt2x00_rf(rt2x00dev, RF3022) &&
-	    !rt2x00_rf(rt2x00dev, RF3052)) {
+	    !rt2x00_rf(rt2x00dev, RF3052) &&
+	    !rt2x00_rf(rt2x00dev, RF3320)) {
 		ERROR(rt2x00dev, "Invalid RF chipset detected.\n");
 		return -ENODEV;
 	}
@@ -3276,7 +3278,8 @@
 	} else if (rt2x00_rf(rt2x00dev, RF3020) ||
 		   rt2x00_rf(rt2x00dev, RF2020) ||
 		   rt2x00_rf(rt2x00dev, RF3021) ||
-		   rt2x00_rf(rt2x00dev, RF3022)) {
+		   rt2x00_rf(rt2x00dev, RF3022) ||
+		   rt2x00_rf(rt2x00dev, RF3320)) {
 		spec->num_channels = 14;
 		spec->channels = rf_vals_3x;
 	} else if (rt2x00_rf(rt2x00dev, RF3052)) {