rfkill: add function to query state

Sometimes it is necessary to know how the state is,
and it is easier to query rfkill than keep track of
it somewhere else, so add a function for that. This
could later be expanded to return hard/soft block,
but so far that isn't necessary.

Signed-off-by: Johannes Berg <[e-mail]>
Signed-off-by: John W. Linville <[e-mail]>

include/linux/rfkill.h

···
  *	registered drivers?
  */
 void rfkill_set_global_sw_state(const enum rfkill_type type, bool blocked);
+
+/**
+ * rfkill_blocked - query rfkill block
+ *
+ * @rfkill: rfkill struct to query
+ */
+bool rfkill_blocked(struct rfkill *rfkill);
 #else /* !RFKILL */
 static inline struct rfkill * __must_check
 rfkill_alloc(const char *name,
···
 static inline void rfkill_set_global_sw_state(const enum rfkill_type type,
 					      bool blocked)
 {
+}
+
+static inline bool rfkill_blocked(struct rfkill *rfkill)
+{
+	return false;
 }
 #endif /* RFKILL || RFKILL_MODULE */
 

net/rfkill/core.c

···
 	.resume		= rfkill_resume,
 };
 
+bool rfkill_blocked(struct rfkill *rfkill)
+{
+	unsigned long flags;
+	u32 state;
+
+	spin_lock_irqsave(&rfkill->lock, flags);
+	state = rfkill->state;
+	spin_unlock_irqrestore(&rfkill->lock, flags);
+
+	return !!(state & RFKILL_BLOCK_ANY);
+}
+EXPORT_SYMBOL(rfkill_blocked);
+
 
 struct rfkill * __must_check rfkill_alloc(const char *name,
 					  struct device *parent,