commit 9ae5a34d17b1134b0dd88457d3efe4745ee4e1fe
author Arun Kumar K.R <akumarkr@codeaurora.org> Wed Aug 23 13:46:03 2017 +0530
committer Arun Kumar K.R <akumarkr@codeaurora.org> Wed Aug 23 16:04:54 2017 +0530
tree fd4fd8d9f136c3f7bc6492275ae9623606158e23
parent edd9998668309a11b5e605f9e22e05827b4cfeb1

liblights: Enable button backlight conditionally

Check for the existence of button backlight node before
enabling that in the HAL.

Change-Id: I66828d67dbabffdb694da55d4a3d12246fb7a66f
Crs-fixed: 2093165

liblight/lights.c

diff --git a/liblight/lights.c b/liblight/lights.c
index 3b5068c..15db827 100644
--- a/liblight/lights.c
+++ b/liblight/lights.c
@@ -361,8 +361,14 @@
         set_light = set_light_battery;
     else if (0 == strcmp(LIGHT_ID_NOTIFICATIONS, name))
         set_light = set_light_notifications;
-    else if (0 == strcmp(LIGHT_ID_BUTTONS, name))
-        set_light = set_light_buttons;
+    else if (0 == strcmp(LIGHT_ID_BUTTONS, name)) {
+        if (!access(BUTTON_FILE, F_OK)) {
+          // enable light button when the file is present
+          set_light = set_light_buttons;
+        } else {
+          return -EINVAL;
+        }
+    }
     else if (0 == strcmp(LIGHT_ID_ATTENTION, name))
         set_light = set_light_attention;
     else