Merge "init: turn off backlight when performing shutdown cleanup"
diff --git a/init/builtins.cpp b/init/builtins.cpp
index b3bd418..95e4c88 100644
--- a/init/builtins.cpp
+++ b/init/builtins.cpp
@@ -16,6 +16,7 @@
#include "builtins.h"
+#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <mntent.h>
@@ -41,6 +42,7 @@
#include <selinux/label.h>
#include <fs_mgr.h>
+#include <android-base/file.h>
#include <android-base/parseint.h>
#include <android-base/stringprintf.h>
#include <cutils/partition_utils.h>
@@ -106,6 +108,32 @@
return ret;
}
+// Turn off backlight while we are performing power down cleanup activities.
+static void turnOffBacklight() {
+ static const char off[] = "0";
+
+ android::base::WriteStringToFile(off, "/sys/class/leds/lcd-backlight/brightness");
+
+ static const char backlightDir[] = "/sys/class/backlight";
+ std::unique_ptr<DIR, int(*)(DIR*)> dir(opendir(backlightDir), closedir);
+ if (!dir) {
+ return;
+ }
+
+ struct dirent *dp;
+ while ((dp = readdir(dir.get())) != NULL) {
+ if (((dp->d_type != DT_DIR) && (dp->d_type != DT_LNK)) ||
+ (dp->d_name[0] == '.')) {
+ continue;
+ }
+
+ std::string fileName = android::base::StringPrintf("%s/%s/brightness",
+ backlightDir,
+ dp->d_name);
+ android::base::WriteStringToFile(off, fileName);
+ }
+}
+
static void unmount_and_fsck(const struct mntent *entry) {
if (strcmp(entry->mnt_type, "f2fs") && strcmp(entry->mnt_type, "ext4"))
return;
@@ -140,6 +168,8 @@
svc->Start();
}
+ turnOffBacklight();
+
int count = 0;
while (count++ < UNMOUNT_CHECK_TIMES) {
int fd = TEMP_FAILURE_RETRY(open(entry->mnt_fsname, O_RDONLY | O_EXCL));
