rt2x00: Implement tx power temperature compensation

rt2800 devices should adjust their tx power in accordance with the
eeproms temperature calibration values. Add a new driver callback
gain_calibration that is called every 4 seconds.

The rt2800 gain calibration routine simply runs the tx power
configuration that takes care of calculating the temperature
compensation delta.

We don't need to synchronize the calls to rt2800_config_txpower
as they should all happen from mac80211's single threaded workqueue.

Signed-off-by: Helmut Schaa <helmut.schaa@googlemail.com>
Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 38 insertions, 0 deletions

diff --git a/drivers/net/wireless/rt2x00/rt2x00link.c b/drivers/net/wireless/rt2x00/rt2x00link.c
index fc8cee91b54e..128b3615c08c 100644
--- a/drivers/net/wireless/rt2x00/rt2x00link.c
+++ b/drivers/net/wireless/rt2x00/rt2x00link.c
@@ -446,8 +446,46 @@ static void rt2x00link_watchdog(struct work_struct *work)
                                              WATCHDOG_INTERVAL);
 }
 
+void rt2x00link_start_agc(struct rt2x00_dev *rt2x00dev)
+{
+        struct link *link = &rt2x00dev->link;
+
+        if (test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags) &&
+            rt2x00dev->ops->lib->gain_calibration)
+                ieee80211_queue_delayed_work(rt2x00dev->hw,
+                                             &link->agc_work,
+                                             AGC_INTERVAL);
+}
+
+void rt2x00link_stop_agc(struct rt2x00_dev *rt2x00dev)
+{
+        cancel_delayed_work_sync(&rt2x00dev->link.agc_work);
+}
+
+static void rt2x00link_agc(struct work_struct *work)
+{
+        struct rt2x00_dev *rt2x00dev =
+            container_of(work, struct rt2x00_dev, link.agc_work.work);
+        struct link *link = &rt2x00dev->link;
+
+        /*
+         * When the radio is shutting down we should
+         * immediately cease the watchdog monitoring.
+         */
+        if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
+                return;
+
+        rt2x00dev->ops->lib->gain_calibration(rt2x00dev);
+
+        if (test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
+                ieee80211_queue_delayed_work(rt2x00dev->hw,
+                                             &link->agc_work,
+                                             AGC_INTERVAL);
+}
+
 void rt2x00link_register(struct rt2x00_dev *rt2x00dev)
 {
+        INIT_DELAYED_WORK(&rt2x00dev->link.agc_work, rt2x00link_agc);
         INIT_DELAYED_WORK(&rt2x00dev->link.watchdog_work, rt2x00link_watchdog);
         INIT_DELAYED_WORK(&rt2x00dev->link.work, rt2x00link_tuner);
 }