IKXCLOCK-4101: use ALS to control backlight

when watch is on charger

1 files changed, 50 insertions, 0 deletions

diff --git a/drivers/misc/als_notify.c b/drivers/misc/als_notify.c
new file mode 100644
index 00000000000..cbb4f3a55cd
--- /dev/null
+++ b/drivers/misc/als_notify.c
@@ -0,0 +1,50 @@
+/*
+ * Copyright (C) 2014 Motorola Mobility LLC.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/notifier.h>
+#include <linux/als_notify.h>
+
+static BLOCKING_NOTIFIER_HEAD(als_notifier_list);
+
+/**
+ * als_register_notify - register a notifier callback for triggering display init
+ * @nb: pointer to the notifier block for the callback events.
+ *
+ */
+void als_register_notify(struct notifier_block *nb)
+{
+	blocking_notifier_chain_register(&als_notifier_list, nb);
+}
+EXPORT_SYMBOL_GPL(als_register_notify);
+
+/**
+ * als_unregister_notify - unregister a notifier callback
+ * @nb: pointer to the notifier block for the callback events.
+ *
+ * als_register_notify() must have been previously called
+ * for this function to work properly.
+ */
+void als_unregister_notify(struct notifier_block *nb)
+{
+	blocking_notifier_chain_unregister(&als_notifier_list, nb);
+}
+EXPORT_SYMBOL_GPL(als_unregister_notify);
+
+void als_notify_subscriber(unsigned long event)
+{
+	blocking_notifier_call_chain(&als_notifier_list, event, NULL);
+}
+EXPORT_SYMBOL_GPL(als_notify_subscriber);