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-rw-r--r--net/rfkill/rfkill.c70
1 files changed, 67 insertions, 3 deletions
diff --git a/net/rfkill/rfkill.c b/net/rfkill/rfkill.c
index fb566902030..a561e350a70 100644
--- a/net/rfkill/rfkill.c
+++ b/net/rfkill/rfkill.c
@@ -46,6 +46,49 @@ MODULE_PARM_DESC(default_state,
static enum rfkill_state rfkill_states[RFKILL_TYPE_MAX];
+static BLOCKING_NOTIFIER_HEAD(rfkill_notifier_list);
+
+
+/**
+ * register_rfkill_notifier - Add notifier to rfkill notifier chain
+ * @nb: pointer to the new entry to add to the chain
+ *
+ * See blocking_notifier_chain_register() for return value and further
+ * observations.
+ *
+ * Adds a notifier to the rfkill notifier chain. The chain will be
+ * called with a pointer to the relevant rfkill structure as a parameter,
+ * refer to include/linux/rfkill.h for the possible events.
+ *
+ * Notifiers added to this chain are to always return NOTIFY_DONE. This
+ * chain is a blocking notifier chain: notifiers can sleep.
+ *
+ * Calls to this chain may have been done through a workqueue. One must
+ * assume unordered asynchronous behaviour, there is no way to know if
+ * actions related to the event that generated the notification have been
+ * carried out already.
+ */
+int register_rfkill_notifier(struct notifier_block *nb)
+{
+ return blocking_notifier_chain_register(&rfkill_notifier_list, nb);
+}
+EXPORT_SYMBOL_GPL(register_rfkill_notifier);
+
+/**
+ * unregister_rfkill_notifier - remove notifier from rfkill notifier chain
+ * @nb: pointer to the entry to remove from the chain
+ *
+ * See blocking_notifier_chain_unregister() for return value and further
+ * observations.
+ *
+ * Removes a notifier from the rfkill notifier chain.
+ */
+int unregister_rfkill_notifier(struct notifier_block *nb)
+{
+ return blocking_notifier_chain_unregister(&rfkill_notifier_list, nb);
+}
+EXPORT_SYMBOL_GPL(unregister_rfkill_notifier);
+
static void rfkill_led_trigger(struct rfkill *rfkill,
enum rfkill_state state)
@@ -62,14 +105,25 @@ static void rfkill_led_trigger(struct rfkill *rfkill,
#endif /* CONFIG_RFKILL_LEDS */
}
+static void notify_rfkill_state_change(struct rfkill *rfkill)
+{
+ blocking_notifier_call_chain(&rfkill_notifier_list,
+ RFKILL_STATE_CHANGED,
+ rfkill);
+}
+
static void update_rfkill_state(struct rfkill *rfkill)
{
- enum rfkill_state newstate;
+ enum rfkill_state newstate, oldstate;
if (rfkill->get_state) {
mutex_lock(&rfkill->mutex);
- if (!rfkill->get_state(rfkill->data, &newstate))
+ if (!rfkill->get_state(rfkill->data, &newstate)) {
+ oldstate = rfkill->state;
rfkill->state = newstate;
+ if (oldstate != newstate)
+ notify_rfkill_state_change(rfkill);
+ }
mutex_unlock(&rfkill->mutex);
}
}
@@ -93,8 +147,10 @@ static int rfkill_toggle_radio(struct rfkill *rfkill,
rfkill->state = state;
}
- if (force || rfkill->state != oldstate)
+ if (force || rfkill->state != oldstate) {
rfkill_led_trigger(rfkill, rfkill->state);
+ notify_rfkill_state_change(rfkill);
+ }
return retval;
}
@@ -139,12 +195,20 @@ EXPORT_SYMBOL(rfkill_switch_all);
*/
int rfkill_force_state(struct rfkill *rfkill, enum rfkill_state state)
{
+ enum rfkill_state oldstate;
+
if (state != RFKILL_STATE_OFF &&
state != RFKILL_STATE_ON)
return -EINVAL;
mutex_lock(&rfkill->mutex);
+
+ oldstate = rfkill->state;
rfkill->state = state;
+
+ if (state != oldstate)
+ notify_rfkill_state_change(rfkill);
+
mutex_unlock(&rfkill->mutex);
return 0;