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>

1 files changed, 28 insertions, 0 deletions

diff --git a/drivers/net/wireless/rt2x00/rt2400pci.c b/drivers/net/wireless/rt2x00/rt2400pci.c
index 6a977679124d..1afba42cc128 100644
--- a/drivers/net/wireless/rt2x00/rt2400pci.c
+++ b/drivers/net/wireless/rt2x00/rt2400pci.c
@@ -524,6 +524,32 @@ static void rt2400pci_config_duration(struct rt2x00_dev *rt2x00dev,
         rt2x00pci_register_write(rt2x00dev, CSR12, reg);
 }
 
+static void rt2400pci_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 rt2400pci_config(struct rt2x00_dev *rt2x00dev,
                              struct rt2x00lib_conf *libconf,
                              const unsigned int flags)
@@ -537,6 +563,8 @@ static void rt2400pci_config(struct rt2x00_dev *rt2x00dev,
                 rt2400pci_config_retry_limit(rt2x00dev, libconf);
         if (flags & IEEE80211_CONF_CHANGE_BEACON_INTERVAL)
                 rt2400pci_config_duration(rt2x00dev, libconf);
+        if (flags & IEEE80211_CONF_CHANGE_PS)
+                rt2400pci_config_ps(rt2x00dev, libconf);
 }
 
 static void rt2400pci_config_cw(struct rt2x00_dev *rt2x00dev,