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_earlysuspend.c b/libsuspend/autosuspend_earlysuspend.c
new file mode 100644
index 0000000..2c2aa36
--- /dev/null
+++ b/libsuspend/autosuspend_earlysuspend.c
@@ -0,0 +1,113 @@
+/*
+ * 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/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+#define LOG_TAG "libsuspend"
+#include <cutils/log.h>
+
+#include "autosuspend_ops.h"
+
+#define EARLYSUSPEND_SYS_POWER_STATE "/sys/power/state"
+#define EARLYSUSPEND_WAIT_FOR_FB_SLEEP "/sys/power/wait_for_fb_sleep"
+#define EARLYSUSPEND_WAIT_FOR_FB_WAKE "/sys/power/wait_for_fb_wake"
+
+
+static int sPowerStatefd;
+static const char *pwr_state_mem = "mem";
+static const char *pwr_state_on = "on";
+
+static int autosuspend_earlysuspend_enable(void)
+{
+ char buf[80];
+ int ret;
+
+ ALOGV("autosuspend_earlysuspend_enable\n");
+
+ ret = write(sPowerStatefd, pwr_state_mem, strlen(pwr_state_mem));
+ if (ret < 0) {
+ strerror_r(errno, buf, sizeof(buf));
+ ALOGE("Error writing to %s: %s\n", EARLYSUSPEND_SYS_POWER_STATE, buf);
+ goto err;
+ }
+
+ ALOGV("autosuspend_earlysuspend_enable done\n");
+
+ return 0;
+
+err:
+ return ret;
+}
+
+static int autosuspend_earlysuspend_disable(void)
+{
+ char buf[80];
+ int ret;
+
+ ALOGV("autosuspend_earlysuspend_disable\n");
+
+ ret = write(sPowerStatefd, pwr_state_on, strlen(pwr_state_on));
+ if (ret < 0) {
+ strerror_r(errno, buf, sizeof(buf));
+ ALOGE("Error writing to %s: %s\n", EARLYSUSPEND_SYS_POWER_STATE, buf);
+ goto err;
+ }
+
+ ALOGV("autosuspend_earlysuspend_disable done\n");
+
+ return 0;
+
+err:
+ return ret;
+}
+
+struct autosuspend_ops autosuspend_earlysuspend_ops = {
+ .enable = autosuspend_earlysuspend_enable,
+ .disable = autosuspend_earlysuspend_disable,
+};
+
+struct autosuspend_ops *autosuspend_earlysuspend_init(void)
+{
+ char buf[80];
+ int ret;
+
+ ret = access(EARLYSUSPEND_WAIT_FOR_FB_SLEEP, F_OK);
+ if (ret < 0) {
+ return NULL;
+ }
+
+ ret = access(EARLYSUSPEND_WAIT_FOR_FB_WAKE, F_OK);
+ if (ret < 0) {
+ return NULL;
+ }
+
+ sPowerStatefd = open(EARLYSUSPEND_SYS_POWER_STATE, O_RDWR);
+
+ if (sPowerStatefd < 0) {
+ strerror_r(errno, buf, sizeof(buf));
+ ALOGE("Error opening %s: %s\n", EARLYSUSPEND_SYS_POWER_STATE, buf);
+ return NULL;
+ }
+
+ ALOGI("Selected early suspend\n");
+ return &autosuspend_earlysuspend_ops;
+}