libsuspend: create new library to handle triggering suspend
libsuspend provides functions autosuspend_enable() and
autosuspend_disable() to trigger suspend on a variety of different
kernels.
Change-Id: I5dc28fb51532fa7c514330f1cfde7698d31d734c
diff --git a/libsuspend/autosuspend.c b/libsuspend/autosuspend.c
new file mode 100644
index 0000000..7d1d973
--- /dev/null
+++ b/libsuspend/autosuspend.c
@@ -0,0 +1,109 @@
+/*
+ * Copyright (C) 2012 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 <stdbool.h>
+
+#define LOG_TAG "libsuspend"
+#include <cutils/log.h>
+
+#include <suspend/autosuspend.h>
+
+#include "autosuspend_ops.h"
+
+static struct autosuspend_ops *autosuspend_ops;
+static bool autosuspend_enabled;
+static bool autosuspend_inited;
+
+static int autosuspend_init(void)
+{
+ if (autosuspend_inited) {
+ return 0;
+ }
+
+ autosuspend_inited = true;
+
+ autosuspend_ops = autosuspend_earlysuspend_init();
+ if (autosuspend_ops) {
+ goto out;
+ }
+
+ autosuspend_ops = autosuspend_autosleep_init();
+ if (autosuspend_ops) {
+ goto out;
+ }
+
+ autosuspend_ops = autosuspend_wakeup_count_init();
+ if (autosuspend_ops) {
+ goto out;
+ }
+
+ if (!autosuspend_ops) {
+ ALOGE("failed to initialize autosuspend\n");
+ return -1;
+ }
+
+out:
+ ALOGV("autosuspend initialized\n");
+ return 0;
+}
+
+int autosuspend_enable(void)
+{
+ int ret;
+
+ ret = autosuspend_init();
+ if (ret) {
+ return ret;
+ }
+
+ ALOGV("autosuspend_enable\n");
+
+ if (autosuspend_enabled) {
+ return 0;
+ }
+
+ ret = autosuspend_ops->enable();
+ if (ret) {
+ return ret;
+ }
+
+ autosuspend_enabled = true;
+ return 0;
+}
+
+int autosuspend_disable(void)
+{
+ int ret;
+
+ ret = autosuspend_init();
+ if (ret) {
+ return ret;
+ }
+
+ ALOGV("autosuspend_disable\n");
+
+ if (!autosuspend_enabled) {
+ return 0;
+ }
+
+ ret = autosuspend_ops->disable();
+ if (ret) {
+ return ret;
+ }
+
+ autosuspend_enabled = false;
+ return 0;
+}