tomato: Use device-specific power feature lib

* Fix double tap to wake toggle as tomato doesn't simply
  write 1 or 0 to the sysfs node

Change-Id: I7aa887dcdffd87a5041d947ac86591ad2c25585a

BoardConfig.mk

@@ -38,7 +38,7 @@ USE_DEVICE_SPECIFIC_CAMERA := true
 
 # CMHW
 BOARD_HARDWARE_CLASS += $(DEVICE_PATH)/cmhw/src
-TARGET_TAP_TO_WAKE_NODE := "/sys/devices/virtual/touchscreen/touchscreen_dev/gesture_ctrl"
+TARGET_POWER_SET_FEATURE_LIB := libpower_set_feature_tomato
 
 # CPU
 TARGET_CPU_CORTEX_A53 := true

power/Android.mk

@@ -0,0 +1,24 @@
+# Copyright (C) 2016 The CyanogenMod Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+LOCAL_PATH:= $(call my-dir)
+include $(CLEAR_VARS)
+
+LOCAL_SRC_FILES := power-feature.c
+LOCAL_SHARED_LIBRARIES := liblog libcutils
+
+LOCAL_MODULE := libpower_set_feature_tomato
+LOCAL_MODULE_TAGS := optional
+
+include $(BUILD_STATIC_LIBRARY)

power/power-feature.c

@@ -0,0 +1,66 @@
+/*
+ * Copyright (C) 2016 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <errno.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <dlfcn.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#include <hardware/power.h>
+
+#define LOG_TAG "PowerHAL feature"
+#include <utils/Log.h>
+
+#define TAP_TO_WAKE_NODE "/sys/devices/virtual/touchscreen/touchscreen_dev/gesture_ctrl"
+
+static int sysfs_write(char *path, char *s)
+{
+    char buf[80];
+    int len;
+    int ret = 0;
+    int fd = open(path, O_WRONLY);
+
+    if (fd < 0) {
+        strerror_r(errno, buf, sizeof(buf));
+        ALOGE("Error opening %s: %s\n", path, buf);
+        return -1 ;
+    }
+
+    len = write(fd, s, strlen(s));
+    if (len < 0) {
+        strerror_r(errno, buf, sizeof(buf));
+        ALOGE("Error writing to %s: %s\n", path, buf);
+
+        ret = -1;
+    }
+
+    close(fd);
+
+    return ret;
+}
+
+void set_device_specific_feature(struct power_module *module __unused,
+        feature_t feature, int state)
+{
+    if (feature == POWER_FEATURE_DOUBLE_TAP_TO_WAKE) {
+        sysfs_write(TAP_TO_WAKE_NODE,
+                state ? "double_click=true" : "double_click=false");
+    }
+}