rtl8180: improve signal reporting for actual rtl8180 hardware

Adapted from Realtek-provided driver...

Signed-off-by: John W. Linville <linville@tuxdriver.com>
Tested-by: Pauli Nieminen <suokkos@gmail.com>

1 files changed, 11 insertions, 1 deletions

diff --git a/drivers/net/wireless/rtl818x/rtl8180_grf5101.c b/drivers/net/wireless/rtl818x/rtl8180_grf5101.c
index 947ee55f18b2..5cab9dfa8c07 100644
--- a/drivers/net/wireless/rtl818x/rtl8180_grf5101.c
+++ b/drivers/net/wireless/rtl818x/rtl8180_grf5101.c
@@ -69,6 +69,15 @@ static void grf5101_write_phy_antenna(struct ieee80211_hw *dev, short chan)
         rtl8180_write_phy(dev, 0x10, ant);
 }
 
+static u8 grf5101_rf_calc_rssi(u8 agc, u8 sq)
+{
+        if (agc > 60)
+                return 65;
+
+        /* TODO(?): just return agc (or agc + 5) to avoid mult / div */
+        return 65 * agc / 60;
+}
+
 static void grf5101_rf_set_channel(struct ieee80211_hw *dev,
                                    struct ieee80211_conf *conf)
 {
@@ -176,5 +185,6 @@ const struct rtl818x_rf_ops grf5101_rf_ops = {
         .name           = "GCT",
         .init           = grf5101_rf_init,
         .stop           = grf5101_rf_stop,
-        .set_chan       = grf5101_rf_set_channel
+        .set_chan       = grf5101_rf_set_channel,
+        .calc_rssi      = grf5101_rf_calc_rssi,
 };