rfkill: export persistent attribute in sysfs

This information allows userspace to implement a hybrid policy where
it can store the rfkill soft-blocked state in platform non-volatile
storage if available, and if not then file-based storage can be used.

Some users prefer platform non-volatile storage because of the behaviour
when dual-booting multiple versions of Linux, or if the rfkill setting
is changed in the BIOS setting screens, or if the BIOS responds to
wireless-toggle hotkeys itself before the relevant platform driver has
been loaded.

Signed-off-by: Alan Jenkins <alan-jenkins@tuffmail.co.uk>
Acked-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/net/rfkill/core.c b/net/rfkill/core.c
index dcf8df7..79693fe 100644
--- a/net/rfkill/core.c
+++ b/net/rfkill/core.c
@@ -610,6 +610,15 @@
 	return sprintf(buf, "%d\n", rfkill->idx);
 }
 
+static ssize_t rfkill_persistent_show(struct device *dev,
+			       struct device_attribute *attr,
+			       char *buf)
+{
+	struct rfkill *rfkill = to_rfkill(dev);
+
+	return sprintf(buf, "%d\n", rfkill->persistent);
+}
+
 static u8 user_state_from_blocked(unsigned long state)
 {
 	if (state & RFKILL_BLOCK_HW)
@@ -668,6 +677,7 @@
 	__ATTR(name, S_IRUGO, rfkill_name_show, NULL),
 	__ATTR(type, S_IRUGO, rfkill_type_show, NULL),
 	__ATTR(index, S_IRUGO, rfkill_idx_show, NULL),
+	__ATTR(persistent, S_IRUGO, rfkill_persistent_show, NULL),
 	__ATTR(state, S_IRUGO|S_IWUSR, rfkill_state_show, rfkill_state_store),
 	__ATTR(claim, S_IRUGO|S_IWUSR, rfkill_claim_show, rfkill_claim_store),
 	__ATTR_NULL