ieee802154: add TX power control to wpan_phy

Replace the current u8 transmit_power in wpan_phy with s8 transmit_power.
The u8 field contained the actual tx power and a tolerance field,
which no physical radio every used. Adjust sysfs entries to keep
compatibility with userspace, give tolerances of +-1dB statically there.

This patch only adds support for this in the at86rf230 driver and the
RF212 chip. Configuration calculation for RF212 is also somewhat basic,
but does the job - the RF212 datasheet gives a large table with
suggested values for combinations of TX power and page/channel, if this
does not work well, we might have to copy the whole table.

Signed-off-by: Phoebe Buckheister <phoebe.buckheister@itwm.fraunhofer.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 11 insertions, 0 deletions

diff --git a/net/mac802154/ieee802154_dev.c b/net/mac802154/ieee802154_dev.c
index 52ae6646a411..9eb49e0886a4 100644
--- a/net/mac802154/ieee802154_dev.c
+++ b/net/mac802154/ieee802154_dev.c
@@ -165,6 +165,16 @@ err:
         return ERR_PTR(err);
 }
 
+static int mac802154_set_txpower(struct wpan_phy *phy, int db)
+{
+        struct mac802154_priv *priv = wpan_phy_priv(phy);
+
+        if (!priv->ops->set_txpower)
+                return -ENOTSUPP;
+
+        return priv->ops->set_txpower(&priv->hw, db);
+}
+
 struct ieee802154_dev *
 ieee802154_alloc_device(size_t priv_data_len, struct ieee802154_ops *ops)
 {
@@ -242,6 +252,7 @@ int ieee802154_register_device(struct ieee802154_dev *dev)
 
         priv->phy->add_iface = mac802154_add_iface;
         priv->phy->del_iface = mac802154_del_iface;
+        priv->phy->set_txpower = mac802154_set_txpower;
 
         rc = wpan_phy_register(priv->phy);
         if (rc < 0)