mac80211: extend/document powersave API

This modifies hardware flags for powersave to support three different
flags:
 * IEEE80211_HW_SUPPORTS_PS - indicates general PS support
 * IEEE80211_HW_PS_NULLFUNC_STACK - indicates nullfunc sending in software
 * IEEE80211_HW_SUPPORTS_DYNAMIC_PS - indicates dynamic PS on the device

It also adds documentation for all this which explains how to set the
various flags.

Additionally, it fixes a few things:
 * a spot where && was used to test flags
 * enable CONF_PS only when associated again

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

6 files changed, 17 insertions, 6 deletions

diff --git a/drivers/net/wireless/iwlwifi/iwl-core.c b/drivers/net/wireless/iwlwifi/iwl-core.c
index 76315c30e6fc..07c3870365be 100644
--- a/drivers/net/wireless/iwlwifi/iwl-core.c
+++ b/drivers/net/wireless/iwlwifi/iwl-core.c
@@ -805,7 +805,8 @@ int iwl_setup_mac(struct iwl_priv *priv)
         /* Tell mac80211 our characteristics */
         hw->flags = IEEE80211_HW_SIGNAL_DBM |
                     IEEE80211_HW_NOISE_DBM |
-                    IEEE80211_HW_AMPDU_AGGREGATION;
+                    IEEE80211_HW_AMPDU_AGGREGATION |
+                    IEEE80211_HW_SUPPORTS_PS;
         hw->wiphy->interface_modes =
                 BIT(NL80211_IFTYPE_STATION) |
                 BIT(NL80211_IFTYPE_ADHOC);
diff --git a/drivers/net/wireless/rt2x00/rt2400pci.c b/drivers/net/wireless/rt2x00/rt2400pci.c
index 9104113270d0..ae8bfd6b59df 100644
--- a/drivers/net/wireless/rt2x00/rt2400pci.c
+++ b/drivers/net/wireless/rt2x00/rt2400pci.c
@@ -1449,7 +1449,9 @@ static int rt2400pci_probe_hw_mode(struct rt2x00_dev *rt2x00dev)
          * Initialize all hw fields.
          */
         rt2x00dev->hw->flags = IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING |
-                               IEEE80211_HW_SIGNAL_DBM;
+                               IEEE80211_HW_SIGNAL_DBM |
+                               IEEE80211_HW_SUPPORTS_PS |
+                               IEEE80211_HW_PS_NULLFUNC_STACK;
         rt2x00dev->hw->extra_tx_headroom = 0;
 
         SET_IEEE80211_DEV(rt2x00dev->hw, rt2x00dev->dev);
diff --git a/drivers/net/wireless/rt2x00/rt2500pci.c b/drivers/net/wireless/rt2x00/rt2500pci.c
index ebcc49770922..bca6798be153 100644
--- a/drivers/net/wireless/rt2x00/rt2500pci.c
+++ b/drivers/net/wireless/rt2x00/rt2500pci.c
@@ -1749,7 +1749,9 @@ static int rt2500pci_probe_hw_mode(struct rt2x00_dev *rt2x00dev)
          * Initialize all hw fields.
          */
         rt2x00dev->hw->flags = IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING |
-                               IEEE80211_HW_SIGNAL_DBM;
+                               IEEE80211_HW_SIGNAL_DBM |
+                               IEEE80211_HW_SUPPORTS_PS |
+                               IEEE80211_HW_PS_NULLFUNC_STACK;
 
         rt2x00dev->hw->extra_tx_headroom = 0;
 
diff --git a/drivers/net/wireless/rt2x00/rt2500usb.c b/drivers/net/wireless/rt2x00/rt2500usb.c
index e992bad64644..27a6971df579 100644
--- a/drivers/net/wireless/rt2x00/rt2500usb.c
+++ b/drivers/net/wireless/rt2x00/rt2500usb.c
@@ -1801,7 +1801,9 @@ static int rt2500usb_probe_hw_mode(struct rt2x00_dev *rt2x00dev)
         rt2x00dev->hw->flags =
             IEEE80211_HW_RX_INCLUDES_FCS |
             IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING |
-            IEEE80211_HW_SIGNAL_DBM;
+            IEEE80211_HW_SIGNAL_DBM |
+            IEEE80211_HW_SUPPORTS_PS |
+            IEEE80211_HW_PS_NULLFUNC_STACK;
 
         rt2x00dev->hw->extra_tx_headroom = TXD_DESC_SIZE;
 
diff --git a/drivers/net/wireless/rt2x00/rt61pci.c b/drivers/net/wireless/rt2x00/rt61pci.c
index 82d35a5a4aa7..549480a963e9 100644
--- a/drivers/net/wireless/rt2x00/rt61pci.c
+++ b/drivers/net/wireless/rt2x00/rt61pci.c
@@ -2556,7 +2556,9 @@ static int rt61pci_probe_hw_mode(struct rt2x00_dev *rt2x00dev)
          */
         rt2x00dev->hw->flags =
             IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING |
-            IEEE80211_HW_SIGNAL_DBM;
+            IEEE80211_HW_SIGNAL_DBM |
+            IEEE80211_HW_SUPPORTS_PS |
+            IEEE80211_HW_PS_NULLFUNC_STACK;
         rt2x00dev->hw->extra_tx_headroom = 0;
 
         SET_IEEE80211_DEV(rt2x00dev->hw, rt2x00dev->dev);
diff --git a/drivers/net/wireless/rt2x00/rt73usb.c b/drivers/net/wireless/rt2x00/rt73usb.c
index 2b70c01b55e9..849220236c7d 100644
--- a/drivers/net/wireless/rt2x00/rt73usb.c
+++ b/drivers/net/wireless/rt2x00/rt73usb.c
@@ -2077,7 +2077,9 @@ static int rt73usb_probe_hw_mode(struct rt2x00_dev *rt2x00dev)
          */
         rt2x00dev->hw->flags =
             IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING |
-            IEEE80211_HW_SIGNAL_DBM;
+            IEEE80211_HW_SIGNAL_DBM |
+            IEEE80211_HW_SUPPORTS_PS |
+            IEEE80211_HW_PS_NULLFUNC_STACK;
         rt2x00dev->hw->extra_tx_headroom = TXD_DESC_SIZE;
 
         SET_IEEE80211_DEV(rt2x00dev->hw, rt2x00dev->dev);