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, 40 insertions, 0 deletions

diff --git a/drivers/net/wireless/rt2x00/rt73usb.c b/drivers/net/wireless/rt2x00/rt73usb.c
index 96a8d69f8790..ae3b31d0d511 100644
--- a/drivers/net/wireless/rt2x00/rt73usb.c
+++ b/drivers/net/wireless/rt2x00/rt73usb.c
@@ -844,6 +844,44 @@ static void rt73usb_config_duration(struct rt2x00_dev *rt2x00dev,
         rt2x00usb_register_write(rt2x00dev, TXRX_CSR9, reg);
 }
 
+static void rt73usb_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) {
+                rt2x00usb_register_read(rt2x00dev, MAC_CSR11, &reg);
+                rt2x00_set_field32(&reg, MAC_CSR11_DELAY_AFTER_TBCN,
+                                   libconf->conf->beacon_int - 10);
+                rt2x00_set_field32(&reg, MAC_CSR11_TBCN_BEFORE_WAKEUP,
+                                   libconf->conf->listen_interval - 1);
+                rt2x00_set_field32(&reg, MAC_CSR11_WAKEUP_LATENCY, 5);
+
+                /* We must first disable autowake before it can be enabled */
+                rt2x00_set_field32(&reg, MAC_CSR11_AUTOWAKE, 0);
+                rt2x00usb_register_write(rt2x00dev, MAC_CSR11, reg);
+
+                rt2x00_set_field32(&reg, MAC_CSR11_AUTOWAKE, 1);
+                rt2x00usb_register_write(rt2x00dev, MAC_CSR11, reg);
+
+                rt2x00usb_vendor_request_sw(rt2x00dev, USB_DEVICE_MODE, 0,
+                                            USB_MODE_SLEEP, REGISTER_TIMEOUT);
+        } else {
+                rt2x00usb_vendor_request_sw(rt2x00dev, USB_DEVICE_MODE, 0,
+                                            USB_MODE_WAKEUP, REGISTER_TIMEOUT);
+
+                rt2x00usb_register_read(rt2x00dev, MAC_CSR11, &reg);
+                rt2x00_set_field32(&reg, MAC_CSR11_DELAY_AFTER_TBCN, 0);
+                rt2x00_set_field32(&reg, MAC_CSR11_TBCN_BEFORE_WAKEUP, 0);
+                rt2x00_set_field32(&reg, MAC_CSR11_AUTOWAKE, 0);
+                rt2x00_set_field32(&reg, MAC_CSR11_WAKEUP_LATENCY, 0);
+                rt2x00usb_register_write(rt2x00dev, MAC_CSR11, reg);
+        }
+}
+
 static void rt73usb_config(struct rt2x00_dev *rt2x00dev,
                            struct rt2x00lib_conf *libconf,
                            const unsigned int flags)
@@ -861,6 +899,8 @@ static void rt73usb_config(struct rt2x00_dev *rt2x00dev,
                 rt73usb_config_retry_limit(rt2x00dev, libconf);
         if (flags & IEEE80211_CONF_CHANGE_BEACON_INTERVAL)
                 rt73usb_config_duration(rt2x00dev, libconf);
+        if (flags & IEEE80211_CONF_CHANGE_PS)
+                rt73usb_config_ps(rt2x00dev, libconf);
 }
 
 /*