cfg80211: add rfkill support

To be easier on drivers and users, have cfg80211 register an
rfkill structure that drivers can access. When soft-killed,
simply take down all interfaces; when hard-killed the driver
needs to notify us and we will take down the interfaces
after the fact. While rfkilled, interfaces cannot be set UP.

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

3 files changed, 44 insertions, 7 deletions

diff --git a/include/asm-generic/errno.h b/include/asm-generic/errno.h
index e8852c092fe..28cc03bf19e 100644
--- a/include/asm-generic/errno.h
+++ b/include/asm-generic/errno.h
@@ -106,4 +106,6 @@
 #define	EOWNERDEAD	130	/* Owner died */
 #define	ENOTRECOVERABLE	131	/* State not recoverable */
 
+#define ERFKILL		132	/* Operation not possible due to RF-kill */
+
 #endif
diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index 8b8e4b89362..1a21895b732 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -757,13 +757,11 @@ enum wiphy_params_flags {
  * @TX_POWER_AUTOMATIC: the dbm parameter is ignored
  * @TX_POWER_LIMITED: limit TX power by the dbm parameter
  * @TX_POWER_FIXED: fix TX power to the dbm parameter
- * @TX_POWER_OFF: turn off completely (will go away)
  */
 enum tx_power_setting {
 	TX_POWER_AUTOMATIC,
 	TX_POWER_LIMITED,
 	TX_POWER_FIXED,
-	TX_POWER_OFF,
 };
 
 /**
@@ -855,8 +853,10 @@ enum tx_power_setting {
  *
  * @set_tx_power: set the transmit power according to the parameters
  * @get_tx_power: store the current TX power into the dbm variable;
- *	return 0 if successful; or -ENETDOWN if successful but power
- *	is disabled (this will go away)
+ *	return 0 if successful
+ *
+ * @rfkill_poll: polls the hw rfkill line, use cfg80211 reporting
+ *	functions to adjust rfkill hw state
  */
 struct cfg80211_ops {
 	int	(*suspend)(struct wiphy *wiphy);
@@ -952,6 +952,8 @@ struct cfg80211_ops {
 	int	(*set_tx_power)(struct wiphy *wiphy,
 				enum tx_power_setting type, int dbm);
 	int	(*get_tx_power)(struct wiphy *wiphy, int *dbm);
+
+	void	(*rfkill_poll)(struct wiphy *wiphy);
 };
 
 /*
@@ -1666,4 +1668,23 @@ void cfg80211_michael_mic_failure(struct net_device *dev, const u8 *addr,
  */
 void cfg80211_ibss_joined(struct net_device *dev, const u8 *bssid, gfp_t gfp);
 
+/**
+ * wiphy_rfkill_set_hw_state - notify cfg80211 about hw block state
+ * @wiphy: the wiphy
+ * @blocked: block status
+ */
+void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked);
+
+/**
+ * wiphy_rfkill_start_polling - start polling rfkill
+ * @wiphy: the wiphy
+ */
+void wiphy_rfkill_start_polling(struct wiphy *wiphy);
+
+/**
+ * wiphy_rfkill_stop_polling - stop polling rfkill
+ * @wiphy: the wiphy
+ */
+void wiphy_rfkill_stop_polling(struct wiphy *wiphy);
+
 #endif /* __NET_CFG80211_H */
diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index 0270aa6e08f..17d61d19d91 100644
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -526,7 +526,7 @@ enum ieee80211_conf_flags {
 /**
  * enum ieee80211_conf_changed - denotes which configuration changed
  *
- * @IEEE80211_CONF_CHANGE_RADIO_ENABLED: the value of radio_enabled changed
+ * @_IEEE80211_CONF_CHANGE_RADIO_ENABLED: DEPRECATED
  * @IEEE80211_CONF_CHANGE_LISTEN_INTERVAL: the listen interval changed
  * @IEEE80211_CONF_CHANGE_RADIOTAP: the radiotap flag changed
  * @IEEE80211_CONF_CHANGE_PS: the PS flag or dynamic PS timeout changed
@@ -536,7 +536,7 @@ enum ieee80211_conf_flags {
  * @IEEE80211_CONF_CHANGE_IDLE: Idle flag changed
  */
 enum ieee80211_conf_changed {
-	IEEE80211_CONF_CHANGE_RADIO_ENABLED	= BIT(0),
+	_IEEE80211_CONF_CHANGE_RADIO_ENABLED	= BIT(0),
 	IEEE80211_CONF_CHANGE_LISTEN_INTERVAL	= BIT(2),
 	IEEE80211_CONF_CHANGE_RADIOTAP		= BIT(3),
 	IEEE80211_CONF_CHANGE_PS		= BIT(4),
@@ -546,6 +546,14 @@ enum ieee80211_conf_changed {
 	IEEE80211_CONF_CHANGE_IDLE		= BIT(8),
 };
 
+static inline __deprecated enum ieee80211_conf_changed
+__IEEE80211_CONF_CHANGE_RADIO_ENABLED(void)
+{
+	return _IEEE80211_CONF_CHANGE_RADIO_ENABLED;
+}
+#define IEEE80211_CONF_CHANGE_RADIO_ENABLED \
+	__IEEE80211_CONF_CHANGE_RADIO_ENABLED()
+
 /**
  * struct ieee80211_conf - configuration of the device
  *
@@ -585,7 +593,7 @@ struct ieee80211_conf {
 	int max_sleep_period;
 
 	u16 listen_interval;
-	bool radio_enabled;
+	bool __deprecated radio_enabled;
 
 	u8 long_frame_max_tx_count, short_frame_max_tx_count;
 
@@ -1396,6 +1404,10 @@ enum ieee80211_ampdu_mlme_action {
  * 	is the first frame we expect to perform the action on. Notice
  * 	that TX/RX_STOP can pass NULL for this parameter.
  *	Returns a negative error code on failure.
+ *
+ * @rfkill_poll: Poll rfkill hardware state. If you need this, you also
+ *	need to set wiphy->rfkill_poll to %true before registration,
+ *	and need to call wiphy_rfkill_set_hw_state() in the callback.
  */
 struct ieee80211_ops {
 	int (*tx)(struct ieee80211_hw *hw, struct sk_buff *skb);
@@ -1444,6 +1456,8 @@ struct ieee80211_ops {
 	int (*ampdu_action)(struct ieee80211_hw *hw,
 			    enum ieee80211_ampdu_mlme_action action,
 			    struct ieee80211_sta *sta, u16 tid, u16 *ssn);
+
+	void (*rfkill_poll)(struct ieee80211_hw *hw);
 };
 
 /**