rt2x00: Add wakeup interrupt handler to rt2800pci.

This is needed to wake up the device automatically for receiving beacons,
and is required for proper powersave handling.
Signed-off-by: Gertjan van Wingerde <gwingerde@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/rt2x00/rt2800pci.c

@@ -1015,6 +1015,14 @@ static void rt2800pci_txdone(struct rt2x00_dev *rt2x00dev)
 	}
 }
 
+static void rt2800pci_wakeup(struct rt2x00_dev *rt2x00dev)
+{
+	struct ieee80211_conf conf = { .flags = 0 };
+	struct rt2x00lib_conf libconf = { .conf = &conf };
+
+	rt2800_config(rt2x00dev, &libconf, IEEE80211_CONF_CHANGE_PS);
+}
+
 static irqreturn_t rt2800pci_interrupt(int irq, void *dev_instance)
 {
 	struct rt2x00_dev *rt2x00dev = dev_instance;
@@ -1039,6 +1047,9 @@ static irqreturn_t rt2800pci_interrupt(int irq, void *dev_instance)
 	if (rt2x00_get_field32(reg, INT_SOURCE_CSR_TX_FIFO_STATUS))
 		rt2800pci_txdone(rt2x00dev);
 
+	if (rt2x00_get_field32(reg, INT_SOURCE_CSR_AUTO_WAKEUP))
+		rt2800pci_wakeup(rt2x00dev);
+
 	return IRQ_HANDLED;
 }