power: Add double tap to wake support

Change-Id: Icb0b6d442544b39576ec74e70e97751d6bc70590

power/Android.mk

@@ -24,6 +24,10 @@ LOCAL_SHARED_LIBRARIES := liblog libcutils
 LOCAL_SRC_FILES := power.c
 LOCAL_MODULE_TAGS := optional
 
+ifneq ($(TARGET_TAP_TO_WAKE_NODE),)
+    LOCAL_CFLAGS := -DDT2W_PATH=\"$(TARGET_DT2W_PATH)\"
+endif
+
 include $(BUILD_SHARED_LIBRARY)
 
 endif

power/power.c

@@ -503,6 +503,22 @@ static int samsung_get_feature(struct power_module *module __unused,
     return -1;
 }
 
+static void samsung_set_feature(struct power_module *module, feature_t feature, int state)
+{
+    struct samsung_power_module *samsung_pwr = (struct samsung_power_module *) module;
+
+    switch (feature) {
+#ifdef DT2W_PATH
+        case POWER_FEATURE_DOUBLE_TAP_TO_WAKE:
+            ALOGV("%s: %s double tap to wake", __func__, state ? "enabling" : "disabling");
+            sysfs_write(DT2W_PATH, state > 0 ? "1" : "0");
+            break;
+#endif
+        default:
+            break;
+    }
+}
+
 static struct hw_module_methods_t power_module_methods = {
     .open = NULL,
 };
@@ -522,7 +538,8 @@ struct samsung_power_module HAL_MODULE_INFO_SYM = {
         .init = samsung_power_init,
         .setInteractive = samsung_power_set_interactive,
         .powerHint = samsung_power_hint,
-        .getFeature = samsung_get_feature
+        .getFeature = samsung_get_feature,
+        .setFeature = samsung_set_feature
     },
 
     .lock = PTHREAD_MUTEX_INITIALIZER,