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init: turn off backlight when performing shutdown cleanup

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Try writing a "0" into:

- /sys/class/leds/lcd-backlight/brightness
- /sys/class/backlight/*/brightness

to turn off the backlight during shutdown cleanup.

Bug: 27506425
Change-Id: Ic8a44dc8909b303f24e14f71cfb43292df60efde
This commit is contained in:
Mark Salyzyn 2016-04-05 13:43:40 -07:00
parent 3443caa2fe
commit a98cc9c202
1 changed files with 30 additions and 0 deletions
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30
init/builtins.cpp
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@ -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 @@ done:
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 @@ static void unmount_and_fsck(const struct mntent *entry) {
svc->Start();
}
turnOffBacklight();
int count = 0;
while (count++ < UNMOUNT_CHECK_TIMES) {
int fd = TEMP_FAILURE_RETRY(open(entry->mnt_fsname, O_RDONLY | O_EXCL));