nl80211/cfg80211: WoWLAN support

This is based on (but now quite far from) the
original work from Luis and Eliad. Add support
for configuring WoWLAN triggers, and getting
the configuration out again. Changes from the
original patchset are too numerous to list,
but one important change needs highlighting:
the suspend() callback is passed NULL for the
trigger configuration if userspace has not
configured WoWLAN at all.

Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com>
Signed-off-by: Eliad Peller <eliad@wizery.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 72 insertions, 2 deletions

diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index 4932dfcb72b4..0920daf36807 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -1088,6 +1088,38 @@ struct cfg80211_pmksa {
 };
 
 /**
+ * struct cfg80211_wowlan_trig_pkt_pattern - packet pattern
+ * @mask: bitmask where to match pattern and where to ignore bytes,
+ *      one bit per byte, in same format as nl80211
+ * @pattern: bytes to match where bitmask is 1
+ * @pattern_len: length of pattern (in bytes)
+ *
+ * Internal note: @mask and @pattern are allocated in one chunk of
+ * memory, free @mask only!
+ */
+struct cfg80211_wowlan_trig_pkt_pattern {
+        u8 *mask, *pattern;
+        int pattern_len;
+};
+
+/**
+ * struct cfg80211_wowlan - Wake on Wireless-LAN support info
+ *
+ * This structure defines the enabled WoWLAN triggers for the device.
+ * @any: wake up on any activity -- special trigger if device continues
+ *      operating as normal during suspend
+ * @disconnect: wake up if getting disconnected
+ * @magic_pkt: wake up on receiving magic packet
+ * @patterns: wake up on receiving packet matching a pattern
+ * @n_patterns: number of patterns
+ */
+struct cfg80211_wowlan {
+        bool any, disconnect, magic_pkt;
+        struct cfg80211_wowlan_trig_pkt_pattern *patterns;
+        int n_patterns;
+};
+
+/**
  * struct cfg80211_ops - backend description for wireless configuration
  *
  * This struct is registered by fullmac card drivers and/or wireless stacks
@@ -1100,7 +1132,9 @@ struct cfg80211_pmksa {
  * wireless extensions but this is subject to reevaluation as soon as this
  * code is used more widely and we have a first user without wext.
  *
- * @suspend: wiphy device needs to be suspended
+ * @suspend: wiphy device needs to be suspended. The variable @wow will
+ *      be %NULL or contain the enabled Wake-on-Wireless triggers that are
+ *      configured for the device.
  * @resume: wiphy device needs to be resumed
  *
  * @add_virtual_intf: create a new virtual interface with the given name,
@@ -1244,7 +1278,7 @@ struct cfg80211_pmksa {
  * @get_ringparam: Get tx and rx ring current and maximum sizes.
  */
 struct cfg80211_ops {
-        int     (*suspend)(struct wiphy *wiphy);
+        int     (*suspend)(struct wiphy *wiphy, struct cfg80211_wowlan *wow);
         int     (*resume)(struct wiphy *wiphy);
 
         struct net_device * (*add_virtual_intf)(struct wiphy *wiphy,
@@ -1480,6 +1514,38 @@ struct ieee80211_txrx_stypes {
 };
 
 /**
+ * enum wiphy_wowlan_support_flags - WoWLAN support flags
+ * @WIPHY_WOWLAN_ANY: supports wakeup for the special "any"
+ *      trigger that keeps the device operating as-is and
+ *      wakes up the host on any activity, for example a
+ *      received packet that passed filtering; note that the
+ *      packet should be preserved in that case
+ * @WIPHY_WOWLAN_MAGIC_PKT: supports wakeup on magic packet
+ *      (see nl80211.h)
+ * @WIPHY_WOWLAN_DISCONNECT: supports wakeup on disconnect
+ */
+enum wiphy_wowlan_support_flags {
+        WIPHY_WOWLAN_ANY        = BIT(0),
+        WIPHY_WOWLAN_MAGIC_PKT  = BIT(1),
+        WIPHY_WOWLAN_DISCONNECT = BIT(2),
+};
+
+/**
+ * struct wiphy_wowlan_support - WoWLAN support data
+ * @flags: see &enum wiphy_wowlan_support_flags
+ * @n_patterns: number of supported wakeup patterns
+ *      (see nl80211.h for the pattern definition)
+ * @pattern_max_len: maximum length of each pattern
+ * @pattern_min_len: minimum length of each pattern
+ */
+struct wiphy_wowlan_support {
+        u32 flags;
+        int n_patterns;
+        int pattern_max_len;
+        int pattern_min_len;
+};
+
+/**
  * struct wiphy - wireless hardware description
  * @reg_notifier: the driver's regulatory notification callback,
  *      note that if your driver uses wiphy_apply_custom_regulatory()
@@ -1546,6 +1612,8 @@ struct ieee80211_txrx_stypes {
  *
  * @max_remain_on_channel_duration: Maximum time a remain-on-channel operation
  *      may request, if implemented.
+ *
+ * @wowlan: WoWLAN support information
  */
 struct wiphy {
         /* assign these fields before you register the wiphy */
@@ -1583,6 +1651,8 @@ struct wiphy {
         char fw_version[ETHTOOL_BUSINFO_LEN];
         u32 hw_version;
 
+        struct wiphy_wowlan_support wowlan;
+
         u16 max_remain_on_channel_duration;
 
         u8 max_num_pmkids;