timekeep: Store the adjusted value into ats_2 file

Store the adjusted value into /data/time/ats_2 file
TWRP will read this value from this path and fix the time

This patch requires some changes in ramdisk, selinux and twrp.

TWRP:

    TARGET_RECOVERY_QCOM_RTC_FIX := true

	reference: https://gerrit.omnirom.org/#/c/18410/

RAMDISK:

	on boot
		...
		mkdir /data/time/ 0700 system system

	reference: https://gerrit.omnirom.org/#/c/18411/

SELINUX:
	file.te
		type timekeep_data_file, file_type, data_file_type;

	file_contexts
		/data/time(/.*)?  u:object_r:timekeep_data_file:s0

	system_app.te
		allow system_app timekeep_data_file:dir { create_dir_perms search };
		allow system_app timekeep_data_file:file create_file_perms;

	timekeep.te
		allow timekeep self:capability {
			sys_time
			dac_override
			dac_read_search
		};
		allow timekeep timekeep_data_file:file create_file_perms;
		allow timekeep timekeep_data_file:dir { create_dir_perms search };

	reference: https://gerrit.omnirom.org/#/c/18409/

Signed-off-by: Humberto Borba <humberos@gmail.com>
Change-Id: I52ff27c377b8a4663762e0c3f6c21d353217dced

2 files changed, 56 insertions, 0 deletions

diff --git a/src/com/sony/timekeep/TimeKeep.java b/src/com/sony/timekeep/TimeKeep.java
index 484ca3c..1bfe5e1 100644
--- a/src/com/sony/timekeep/TimeKeep.java
+++ b/src/com/sony/timekeep/TimeKeep.java
@@ -31,8 +31,15 @@
 
 package com.sony.timekeep;
 
+import java.nio.ByteBuffer;
+import java.nio.ByteOrder;
+import java.io.BufferedOutputStream;
+import java.io.File;
+import java.io.FileOutputStream;
+import java.io.FileNotFoundException;
 import java.io.FileInputStream;
 import java.io.IOException;
+import java.lang.Long;
 import java.lang.System;
 
 import android.content.BroadcastReceiver;
@@ -45,6 +52,7 @@ public class TimeKeep extends BroadcastReceiver {
 	private static final String TAG = "TimeKeep-Receiver";
 	private static final String TIMEADJ_PROP = "persist.sys.timeadjust";
 	private static final String RTC_SINCE_EPOCH = "/sys/class/rtc/rtc0/since_epoch";
+	private static final String RTC_ATS_FILE = "/data/time/ats_2";
 
 	@Override
 	public void onReceive(Context context, Intent intent) {
@@ -58,6 +66,7 @@ public class TimeKeep extends BroadcastReceiver {
 
 		Log.d(TAG, "Setting adjust property to " + seconds);
 		SystemProperties.set(TIMEADJ_PROP, Long.toString(seconds));
+		writeATS(seconds);
 	}
 
 	private long readEpoch() {
@@ -80,4 +89,29 @@ public class TimeKeep extends BroadcastReceiver {
 
 		return epoch;
 	}
+
+	private void writeATS(long seconds) {
+		BufferedOutputStream bos = null;
+		long milliseconds = seconds * 1000;
+		ByteBuffer buffer = ByteBuffer.allocate(8).order(ByteOrder.nativeOrder());
+		buffer.putLong(milliseconds);
+		try {
+			bos = new BufferedOutputStream(new FileOutputStream(RTC_ATS_FILE, false));
+			bos.write(buffer.array());
+			bos.flush();
+		} catch (FileNotFoundException ex) {
+			Log.w(TAG, "file " + RTC_ATS_FILE + " not found: " + ex);
+		} catch (IOException ex) {
+			Log.w(TAG, "IOException trying to sync " + RTC_ATS_FILE + ": " + ex);
+		} finally {
+			if (bos != null) {
+				try {
+					Log.w(TAG, "file " + RTC_ATS_FILE + ": " + milliseconds);
+					bos.close();
+				} catch (IOException ex) {
+					Log.w(TAG, "IOException while closing synced file: ", ex);
+				}
+			}
+		}
+	}
 }
diff --git a/timekeep.c b/timekeep.c
index 5e48bbe..6bb9575 100644
--- a/timekeep.c
+++ b/timekeep.c
@@ -33,6 +33,7 @@
 #include <string.h>
 #include <fcntl.h>
 
+#include <sys/stat.h>
 #include <sys/time.h>
 
 #define LOG_TAG "TimeKeep"
@@ -42,6 +43,7 @@
 #include <errno.h>
 
 #define RTC_SYS_FILE "/sys/class/rtc/rtc0/since_epoch"
+#define RTC_ATS_FILE "/data/time/ats_2"
 #define TIME_ADJUST_PROP "persist.sys.timeadjust"
 
 int read_epoch(unsigned long* epoch) {
@@ -70,6 +72,24 @@ int read_epoch(unsigned long* epoch) {
 	return res;
 }
 
+void restore_ats(unsigned long value) {
+	FILE *fp = NULL;
+	char mode[] = "0777";
+	int i;
+
+	i = strtol(mode, 0, 8);
+	value *= 1000;
+	fp = fopen(RTC_ATS_FILE, "wb");
+
+	if (fp != NULL) {
+		chmod(RTC_ATS_FILE, i);
+		fwrite(&value, sizeof(value), 1, fp);
+		fclose(fp);
+	} else {
+		ALOGI("Can't restore " RTC_ATS_FILE);
+	}
+}
+
 int store_time() {
 	char prop[PROPERTY_VALUE_MAX];
 	unsigned long seconds = 0;
@@ -90,6 +110,7 @@ int store_time() {
 		} else {
 			seconds -= epoch_since;
 			snprintf(prop, PROPERTY_VALUE_MAX, "%lu", seconds);
+			restore_ats(seconds);
 			property_set(TIME_ADJUST_PROP, prop);
 			ALOGI("Time adjustment stored to property");
 			res = 0;
@@ -127,6 +148,7 @@ int restore_time() {
 		ALOGI("Failed to read from " RTC_SYS_FILE
 		      " (%d), bailing out", res);
 	} else {
+		restore_ats(time_adjust);
 		tv.tv_sec = epoch_since + time_adjust;
 		tv.tv_usec = 0;
 		res = settimeofday(&tv, NULL);