ieee802154: change cca ed level to mbm

This patch change the handling of cca energy detection level from dbm to
mbm. This prepares to handle floating point cca energy detection levels
values. The old netlink 802.15.4 will convert the dbm value to mbm for
handling backward compatibility.

Signed-off-by: Alexander Aring <alex.aring@gmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
diff --git a/drivers/net/ieee802154/at86rf230.c b/drivers/net/ieee802154/at86rf230.c
index 3a303e4..e68d45e 100644
--- a/drivers/net/ieee802154/at86rf230.c
+++ b/drivers/net/ieee802154/at86rf230.c
@@ -1268,9 +1268,10 @@
 }
 
 static int
-at86rf230_set_cca_ed_level(struct ieee802154_hw *hw, s32 level)
+at86rf230_set_cca_ed_level(struct ieee802154_hw *hw, s32 mbm)
 {
 	struct at86rf230_local *lp = hw->priv;
+	s32 level = mbm / 100;
 
 	if (level < lp->data->rssi_base_val || level > 30)
 		return -EINVAL;