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_autosleep.c b/libsuspend/autosuspend_autosleep.c
new file mode 100644
index 0000000..dd0dfef
--- /dev/null
+++ b/libsuspend/autosuspend_autosleep.c
@@ -0,0 +1,99 @@
+/*
+ * 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 <errno.h>
+#include <fcntl.h>
+#include <stddef.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#define LOG_TAG "libsuspend"
+#include <cutils/log.h>
+
+#include "autosuspend_ops.h"
+
+#define SYS_POWER_AUTOSLEEP "/sys/power/autosleep"
+
+static int autosleep_fd;
+static const char *sleep_state = "mem";
+static const char *on_state = "off";
+
+static int autosuspend_autosleep_enable(void)
+{
+ char buf[80];
+ int ret;
+
+ ALOGV("autosuspend_autosleep_enable\n");
+
+ ret = write(autosleep_fd, sleep_state, strlen(sleep_state));
+ if (ret < 0) {
+ strerror_r(errno, buf, sizeof(buf));
+ ALOGE("Error writing to %s: %s\n", SYS_POWER_AUTOSLEEP, buf);
+ goto err;
+ }
+
+ ALOGV("autosuspend_autosleep_enable done\n");
+
+ return 0;
+
+err:
+ return ret;
+}
+
+static int autosuspend_autosleep_disable(void)
+{
+ char buf[80];
+ int ret;
+
+ ALOGV("autosuspend_autosleep_disable\n");
+
+ ret = write(autosleep_fd, on_state, strlen(on_state));
+ if (ret < 0) {
+ strerror_r(errno, buf, sizeof(buf));
+ ALOGE("Error writing to %s: %s\n", SYS_POWER_AUTOSLEEP, buf);
+ goto err;
+ }
+
+ ALOGV("autosuspend_autosleep_disable done\n");
+
+ return 0;
+
+err:
+ return ret;
+}
+
+struct autosuspend_ops autosuspend_autosleep_ops = {
+ .enable = autosuspend_autosleep_enable,
+ .disable = autosuspend_autosleep_disable,
+};
+
+struct autosuspend_ops *autosuspend_autosleep_init(void)
+{
+ int ret;
+ char buf[80];
+
+ autosleep_fd = open(SYS_POWER_AUTOSLEEP, O_WRONLY);
+ if (autosleep_fd < 0) {
+ strerror_r(errno, buf, sizeof(buf));
+ ALOGE("Error opening %s: %s\n", SYS_POWER_AUTOSLEEP, buf);
+ return NULL;
+ }
+
+ ALOGI("Selected autosleep\n");
+ return &autosuspend_autosleep_ops;
+}