commit 7d7f19ccb777946df0a8fb7c83189ba2ae08b02e
author Ivo van Doorn <ivdoorn@gmail.com> Sat Dec 20 10:52:42 2008 +0100
committer John W. Linville <linville@tuxdriver.com> Thu Jan 29 15:58:34 2009 -0500
tree 38fcea85510a4945283cf23bc029261b3941fc74
parent 3ebbbb56a162b8f9b9a77bc7810b9d4e0868e039

rt2x00: Implement Powersaving

Listen to IEEE80211_CONF_PS to determine if the device
should drop into powersaving mode. This feature depends
on the dynamic power save functionality in mac80211.

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

drivers/net/wireless/rt2x00/rt2500pci.c

diff --git a/drivers/net/wireless/rt2x00/rt2500pci.c b/drivers/net/wireless/rt2x00/rt2500pci.c
index d3bc218..bf5e811 100644
--- a/drivers/net/wireless/rt2x00/rt2500pci.c
+++ b/drivers/net/wireless/rt2x00/rt2500pci.c
@@ -573,6 +573,32 @@
 	rt2x00pci_register_write(rt2x00dev, CSR12, reg);
 }
 
+static void rt2500pci_config_ps(struct rt2x00_dev *rt2x00dev,
+				struct rt2x00lib_conf *libconf)
+{
+	enum dev_state state =
+	    (libconf->conf->flags & IEEE80211_CONF_PS) ?
+		STATE_SLEEP : STATE_AWAKE;
+	u32 reg;
+
+	if (state == STATE_SLEEP) {
+		rt2x00pci_register_read(rt2x00dev, CSR20, &reg);
+		rt2x00_set_field32(&reg, CSR20_DELAY_AFTER_TBCN,
+				   (libconf->conf->beacon_int - 20) * 16);
+		rt2x00_set_field32(&reg, CSR20_TBCN_BEFORE_WAKEUP,
+				   libconf->conf->listen_interval - 1);
+
+		/* We must first disable autowake before it can be enabled */
+		rt2x00_set_field32(&reg, CSR20_AUTOWAKE, 0);
+		rt2x00pci_register_write(rt2x00dev, CSR20, reg);
+
+		rt2x00_set_field32(&reg, CSR20_AUTOWAKE, 1);
+		rt2x00pci_register_write(rt2x00dev, CSR20, reg);
+	}
+
+	rt2x00dev->ops->lib->set_device_state(rt2x00dev, state);
+}
+
 static void rt2500pci_config(struct rt2x00_dev *rt2x00dev,
 			     struct rt2x00lib_conf *libconf,
 			     const unsigned int flags)
@@ -588,6 +614,8 @@
 		rt2500pci_config_retry_limit(rt2x00dev, libconf);
 	if (flags & IEEE80211_CONF_CHANGE_BEACON_INTERVAL)
 		rt2500pci_config_duration(rt2x00dev, libconf);
+	if (flags & IEEE80211_CONF_CHANGE_PS)
+		rt2500pci_config_ps(rt2x00dev, libconf);
 }
 
 /*