/*
 * this function syncs system time with RTC when startup
 * if there is valid time store in RTC static int rtc_hctosys(void)
 */
static int rtc_hctosys(void)
{
	int err;
	struct rtc_time tm;
	struct rtc_device *rtc = rtc_class_open("rtc1");
	if (rtc == NULL) {
		printk("%s: unable to open rtc device (rtc1) for rtc_hctosys\n",
			__FILE__);
		return -ENODEV;
	}

	err = rtc_read_time(rtc, &tm);
	if (err == 0) {
		err = rtc_valid_tm(&tm);
		if (err == 0) {
			struct timespec tv;

			tv.tv_nsec = NSEC_PER_SEC >> 1;

			rtc_tm_to_time(&tm, &tv.tv_sec);

			do_settimeofday(&tv);

			dev_info(rtc->dev.parent,
				"setting system clock to "
				"%d-%02d-%02d %02d:%02d:%02d UTC (%u)\n",
				tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday,
				tm.tm_hour, tm.tm_min, tm.tm_sec,
				(unsigned int) tv.tv_sec);
		} else { 

static int bq2419x_wakealarm(struct bq2419x_chip *bq2419x, int time_sec)
{
	int ret;
	unsigned long now;
	struct rtc_wkalrm alm;
	int alarm_time = time_sec;

	if (!alarm_time)
		return 0;

	alm.enabled = true;
	ret = rtc_read_time(bq2419x->rtc, &alm.time);
	if (ret < 0) {
		dev_err(bq2419x->dev, "RTC read time failed %d\n", ret);
		return ret;
	}
	rtc_tm_to_time(&alm.time, &now);

	rtc_time_to_tm(now + alarm_time, &alm.time);
	ret = rtc_set_alarm(bq2419x->rtc, &alm);
	if (ret < 0) {
		dev_err(bq2419x->dev, "RTC set alarm failed %d\n", ret);
		alm.enabled = false;
		return ret;
	}
	alm.enabled = false;
	return 0;
}

void set_power_on_alarm(long secs, bool enable)
{
	int rc;
	struct timespec wall_time;
	long rtc_secs, alarm_time, alarm_delta;
	struct rtc_time rtc_time;
	struct rtc_wkalrm alarm;

	rc = mutex_lock_interruptible(&power_on_alarm_lock);
	if (rc != 0)
		return;

	if (enable) {
			power_on_alarm = secs;
	} else {
		if (power_on_alarm == secs)
			power_on_alarm = 0;
		else
			goto exit;
	}

	if (!power_on_alarm)
		goto disable_alarm;

	rtc_read_time(rtcdev, &rtc_time);
	getnstimeofday(&wall_time);
	rtc_tm_to_time(&rtc_time, &rtc_secs);
	alarm_delta = wall_time.tv_sec - rtc_secs;
	alarm_time = power_on_alarm - alarm_delta;

	/*
	 *Substract ALARM_DELTA from actual alarm time
	 *to power up the device before actual alarm
	 *expiration
	 */
#ifdef CONFIG_ZTEMT_PON_ALARM_DELTA
       if ((alarm_time - ALARM_DELTA) > rtc_secs)
               alarm_time -= ALARM_DELTA;
       else
               goto disable_alarm;
#else
	if (alarm_time <= rtc_secs)
		goto disable_alarm;
#endif

	rtc_time_to_tm(alarm_time, &alarm.time);
	alarm.enabled = 1;
	rc = rtc_set_alarm(rtcdev, &alarm);
	if (rc)
		goto disable_alarm;

	mutex_unlock(&power_on_alarm_lock);
	return;

disable_alarm:
	power_on_alarm = 0;
	rtc_alarm_irq_enable(rtcdev, 0);
exit:
	mutex_unlock(&power_on_alarm_lock);
}

/* Called once per device from rtc_device_register */
int rtc_initialize_alarm(struct rtc_device *rtc, struct rtc_wkalrm *alarm)
{
	int err;
	struct rtc_time now;

	err = rtc_valid_tm(&alarm->time);
	if (err != 0)
		return err;

	err = rtc_read_time(rtc, &now);
	if (err)
		return err;

	err = mutex_lock_interruptible(&rtc->ops_lock);
	if (err)
		return err;

	rtc->aie_timer.node.expires = rtc_tm_to_ktime(alarm->time);
	rtc->aie_timer.period = 0;

	/* Alarm has to be enabled & in the future for us to enqueue it */
	if (alarm->enabled && (rtc_tm_to_ktime(now) <
			 rtc->aie_timer.node.expires)) {

		rtc->aie_timer.enabled = 1;
		timerqueue_add(&rtc->timerqueue, &rtc->aie_timer.node);
		trace_rtc_timer_enqueue(&rtc->aie_timer);
	}
	mutex_unlock(&rtc->ops_lock);
	return err;
}

static int rtc_suspend(struct device *dev, pm_message_t mesg)
{
	struct rtc_device	*rtc = to_rtc_device(dev);
	struct rtc_time		tm;
	struct timespec		delta, delta_delta;
	if (strcmp(dev_name(&rtc->dev), CONFIG_RTC_HCTOSYS_DEVICE) != 0)
		return 0;

	/* snapshot the current RTC and system time at suspend*/
	rtc_read_time(rtc, &tm);
	getnstimeofday(&old_system);
	rtc_tm_to_time(&tm, &old_rtc.tv_sec);


	/*
	 * To avoid drift caused by repeated suspend/resumes,
	 * which each can add ~1 second drift error,
	 * try to compensate so the difference in system time
	 * and rtc time stays close to constant.
	 */
	delta = timespec_sub(old_system, old_rtc);
	delta_delta = timespec_sub(delta, old_delta);
	if (delta_delta.tv_sec < -2 || delta_delta.tv_sec >= 2) {
		/*
		 * if delta_delta is too large, assume time correction
		 * has occured and set old_delta to the current delta.
		 */
		old_delta = delta;
	} else {
		/* Otherwise try to adjust old_system to compensate */
		old_system = timespec_sub(old_system, delta_delta);
	}

	return 0;
}

static int suspend_autotest_suspend(struct device *dev)
{
	unsigned long now;
	struct rtc_wkalrm alm;
	int status;
	int need_test = 0;
	unsigned long alarm_time;

	/* if test isn't enabled, no need to proceed below code */
	if ((!test_enable) || (test_mode != SUSPEND))
		return 0;

	/* read alarm time */
	status = rtc_read_alarm(rtc, &alm);
	if (status) {
		pr_info("%s: rtc_read_alarm fail\n", __func__);
		return status;
	}

	rtc_tm_to_time(&alm.time, &alarm_time);
	/* if alarm is set already, alarm time should be compared.
	 * if no alarm is set, test alarm can be done.
	 */
	if (alm.enabled)
		need_test = 0;
	else
		need_test = 1;

	status = rtc_read_time(rtc, &alm.time);
	if (status < 0) {
		pr_info("%s: rtc_read_time fail\n", __func__);
		return status;
	}
	rtc_tm_to_time(&alm.time, &now);

	/* if alarm will be expired in TEST_SUSPEND_SECONDS,
	 * don't set test alarm time
	 */
	if (!need_test && alarm_time < (now + TEST_SUSPEND_SECONDS)) {
		pr_info("%s: no setting of test alarm\n", __func__);
		return 0;
	}

	memset(&alm, 0, sizeof alm);
	rtc_time_to_tm(now + TEST_SUSPEND_SECONDS, &alm.time);
	alm.enabled = true;

	status = rtc_set_alarm(rtc, &alm);
	if (status < 0) {
		pr_info("%s: rtc_set_alarm fail\n",__func__);
		return status;
	}

	test_alarm_set = 1;
	pr_info("%s: test alarm will be envoked after about %d sec.\n",
			__func__, TEST_SUSPEND_SECONDS);

	return 0;
}

static int rtc_proc_show(struct seq_file *seq, void *offset)
{
	int err;
	struct class_device *class_dev = seq->private;
	const struct rtc_class_ops *ops = to_rtc_device(class_dev)->ops;
	struct rtc_wkalrm alrm;
	struct rtc_time tm;

	err = rtc_read_time(class_dev, &tm);
	if (err == 0) {
		seq_printf(seq,
			"rtc_time\t: %02d:%02d:%02d\n"
			"rtc_date\t: %04d-%02d-%02d\n",
			tm.tm_hour, tm.tm_min, tm.tm_sec,
			tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday);
	}

	err = rtc_read_alarm(class_dev, &alrm);
	if (err == 0) {
		seq_printf(seq, "alrm_time\t: ");
		if ((unsigned int)alrm.time.tm_hour <= 24)
			seq_printf(seq, "%02d:", alrm.time.tm_hour);
		else
			seq_printf(seq, "**:");
		if ((unsigned int)alrm.time.tm_min <= 59)
			seq_printf(seq, "%02d:", alrm.time.tm_min);
		else
			seq_printf(seq, "**:");
		if ((unsigned int)alrm.time.tm_sec <= 59)
			seq_printf(seq, "%02d\n", alrm.time.tm_sec);
		else
			seq_printf(seq, "**\n");

		seq_printf(seq, "alrm_date\t: ");
		if ((unsigned int)alrm.time.tm_year <= 200)
			seq_printf(seq, "%04d-", alrm.time.tm_year + 1900);
		else
			seq_printf(seq, "****-");
		if ((unsigned int)alrm.time.tm_mon <= 11)
			seq_printf(seq, "%02d-", alrm.time.tm_mon + 1);
		else
			seq_printf(seq, "**-");
		if (alrm.time.tm_mday && (unsigned int)alrm.time.tm_mday <= 31)
			seq_printf(seq, "%02d\n", alrm.time.tm_mday);
		else
			seq_printf(seq, "**\n");
		seq_printf(seq, "alarm_IRQ\t: %s\n",
				alrm.enabled ? "yes" : "no");
		seq_printf(seq, "alrm_pending\t: %s\n",
				alrm.pending ? "yes" : "no");
	}

	seq_printf(seq, "24hr\t\t: yes\n");

	if (ops->proc)
		ops->proc(class_dev->dev, seq);

	return 0;
}

static int read_rtc0_time(struct msm_rpc_server *server,
		   struct rpc_request_hdr *req,
		   unsigned len)
{
	int err;
	unsigned long tm_sec;
	uint32_t size = 0;
	void *reply;
	uint32_t output_valid;
	uint32_t rpc_status = RPC_ACCEPTSTAT_SYSTEM_ERR;
	struct rtc_time tm;
	struct rtc_device *rtc = rtc_class_open(CONFIG_RTC_HCTOSYS_DEVICE);

	if (rtc == NULL) {
		pr_err("%s: unable to open rtc device (%s)\n",
			__FILE__, CONFIG_RTC_HCTOSYS_DEVICE);
		goto send_reply;
	}

	err = rtc_read_time(rtc, &tm);
	if (err) {
		pr_err("%s: Error reading rtc device (%s) : %d\n",
			__FILE__, CONFIG_RTC_HCTOSYS_DEVICE, err);
		goto close_dev;
	}

	err = rtc_valid_tm(&tm);
	if (err) {
		pr_err("%s: Invalid RTC time (%s)\n",
			__FILE__, CONFIG_RTC_HCTOSYS_DEVICE);
		goto close_dev;
	}

	rtc_tm_to_time(&tm, &tm_sec);
	rpc_status = RPC_ACCEPTSTAT_SUCCESS;

close_dev:
	rtc_class_close(rtc);

send_reply:
	reply = msm_rpc_server_start_accepted_reply(server, req->xid,
						    rpc_status);
	if (rpc_status == RPC_ACCEPTSTAT_SUCCESS) {
		output_valid = *((uint32_t *)(req + 1));
		*(uint32_t *)reply = output_valid;
		size = sizeof(uint32_t);
		if (be32_to_cpu(output_valid)) {
			reply += sizeof(uint32_t);
			*(uint32_t *)reply = cpu_to_be32(tm_sec);
			size += sizeof(uint32_t);
		}
	}
	err = msm_rpc_server_send_accepted_reply(server, size);
	if (err)
		pr_err("%s: send accepted reply failed: %d\n", __func__, err);

	return 1;
}

int rtc_hctosys(void)
{
	int err = -ENODEV;
	struct rtc_time tm;
	struct timespec tv = {
		.tv_nsec = NSEC_PER_SEC >> 1,
	};
	struct rtc_device *rtc = rtc_class_open(CONFIG_RTC_HCTOSYS_DEVICE);

	if (rtc == NULL) {
		pr_err("%s: unable to open rtc device (%s)\n",
			__FILE__, CONFIG_RTC_HCTOSYS_DEVICE);
		goto err_open;
	}

	err = rtc_read_time(rtc, &tm);
	if (err) {
		dev_err(rtc->dev.parent,
			"hctosys: unable to read the hardware clock\n");
		goto err_read;

	}

	/*
	 * Force update rtc year time to 2014
	 * (The release year of device)
	 */
	tm.tm_year = 114;

	err = rtc_valid_tm(&tm);
	if (err) {
		dev_err(rtc->dev.parent,
			"hctosys: invalid date/time\n");
		goto err_invalid;
	}

	rtc_tm_to_time(&tm, &tv.tv_sec);

	err = do_settimeofday(&tv);

	dev_info(rtc->dev.parent,
		"setting system clock to "
		"%d-%02d-%02d %02d:%02d:%02d UTC (%u)\n",
		tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday,
		tm.tm_hour, tm.tm_min, tm.tm_sec,
		(unsigned int) tv.tv_sec);

err_invalid:
err_read:
	rtc_class_close(rtc);

err_open:
	rtc_hctosys_ret = err;

	return err;
}

late_initcall(rtc_hctosys);

static int rtc_resume(struct device *dev)
{
	struct rtc_device	*rtc = to_rtc_device(dev);
	struct rtc_time		tm;
	struct timespec		new_system, new_rtc;
	struct timespec		sleep_time;

	if (strcmp(dev_name(&rtc->dev), CONFIG_RTC_HCTOSYS_DEVICE) != 0)
		return 0;

#if defined(ADJUST_KERNEL_TIME)
	printk("%s [RTC] ==================================== \n", __func__);
#endif

	/* snapshot the current rtc and system time at resume */
	getnstimeofday(&new_system);
	rtc_read_time(rtc, &tm);
	if (rtc_valid_tm(&tm) != 0) {
		pr_debug("%s:  bogus resume time\n", dev_name(&rtc->dev));
		return 0;
	}
	rtc_tm_to_time(&tm, &new_rtc.tv_sec);
	new_rtc.tv_nsec = 0;

	if (new_rtc.tv_sec < old_rtc.tv_sec) {
		pr_debug("%s:  time travel!\n", dev_name(&rtc->dev));
		return 0;
	}

	/* calculate the RTC time delta (sleep time)*/
	sleep_time = timespec_sub(new_rtc, old_rtc);

	/*
	 * Since these RTC suspend/resume handlers are not called
	 * at the very end of suspend or the start of resume,
	 * some run-time may pass on either sides of the sleep time
	 * so subtract kernel run-time between rtc_suspend to rtc_resume
	 * to keep things accurate.
	 */
	sleep_time = timespec_sub(sleep_time,
			timespec_sub(new_system, old_system));

	if (sleep_time.tv_sec >= 0)
		timekeeping_inject_sleeptime(&sleep_time);

#ifdef ADJUST_KERNEL_TIME
	schedule_delayed_work(&rtc_work, RTC_WORK_CHECK_TIMEOUT);
#endif

#if defined(ADJUST_KERNEL_TIME)
	printk("%s [RTC] sleep_time = %ld \n", __func__,sleep_time.tv_sec);
	printk("%s [RTC] time now = %ld\n", __func__,new_rtc.tv_sec);
	printk("%s [RTC] ==================================== \n", __func__);
#endif

	return 0;
}

int rtc_hctosys(void)
{
	int err = -ENODEV;
	struct rtc_time tm;
	struct timespec tv = {
		.tv_nsec = NSEC_PER_SEC >> 1,
	};
	struct rtc_device *rtc = rtc_class_open(CONFIG_RTC_HCTOSYS_DEVICE);

	if (rtc == NULL) {
		pr_err("%s: unable to open rtc device (%s)\n",
			__FILE__, CONFIG_RTC_HCTOSYS_DEVICE);
		goto err_open;
	}

	err = rtc_read_time(rtc, &tm);
	if (err) {
		dev_err(rtc->dev.parent,
			"hctosys: unable to read the hardware clock\n");
		goto err_read;

	}

	err = rtc_valid_tm(&tm);
	if (err) {
		dev_err(rtc->dev.parent,
			"hctosys: invalid date/time\n");
		goto err_invalid;
	}

	rtc_tm_to_time(&tm, &tv.tv_sec);

	if (tv.tv_sec < 86400) {
		tv.tv_sec = 86400;
		pr_info("%s: Make sure the boot time starts from 86400 or more to avoid system server crash due to alarm trigger immediately\n", __FILE__);
	}
	do_settimeofday(&tv);

	dev_info(rtc->dev.parent,
		"setting system clock to "
		"%d-%02d-%02d %02d:%02d:%02d UTC (%u)\n",
		tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday,
		tm.tm_hour, tm.tm_min, tm.tm_sec,
		(unsigned int) tv.tv_sec);

err_invalid:
err_read:
	rtc_class_close(rtc);

err_open:
	rtc_hctosys_ret = err;

	return err;
}

late_initcall(rtc_hctosys);

static int rtc_read_proc(char *page, char **start, off_t off, int count, int *eof, void *data)
{
	struct rtc_ops *ops = data;
	struct rtc_wkalrm alrm;
	struct rtc_time tm;
	char *p = page;

	if (rtc_read_time(ops, &tm) == 0) {
		p += sprintf(p,
			"rtc_time\t: %02d:%02d:%02d\n"
			"rtc_date\t: %04d-%02d-%02d\n"
			"rtc_epoch\t: %04lu\n",
			tm.tm_hour, tm.tm_min, tm.tm_sec,
			tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday,
			rtc_epoch);
	}

	if (rtc_read_alarm(ops, &alrm) == 0) {
		p += sprintf(p, "alrm_time\t: ");
		if ((unsigned int)alrm.time.tm_hour <= 24)
			p += sprintf(p, "%02d:", alrm.time.tm_hour);
		else
			p += sprintf(p, "**:");
		if ((unsigned int)alrm.time.tm_min <= 59)
			p += sprintf(p, "%02d:", alrm.time.tm_min);
		else
			p += sprintf(p, "**:");
		if ((unsigned int)alrm.time.tm_sec <= 59)
			p += sprintf(p, "%02d\n", alrm.time.tm_sec);
		else
			p += sprintf(p, "**\n");

		p += sprintf(p, "alrm_date\t: ");
		if ((unsigned int)alrm.time.tm_year <= 200)
			p += sprintf(p, "%04d-", alrm.time.tm_year + 1900);
		else
			p += sprintf(p, "****-");
		if ((unsigned int)alrm.time.tm_mon <= 11)
			p += sprintf(p, "%02d-", alrm.time.tm_mon + 1);
		else
			p += sprintf(p, "**-");
		if ((unsigned int)alrm.time.tm_mday <= 31)
			p += sprintf(p, "%02d\n", alrm.time.tm_mday);
		else
			p += sprintf(p, "**\n");
		p += sprintf(p, "alrm_wakeup\t: %s\n",
			     alrm.enabled ? "yes" : "no");
		p += sprintf(p, "alrm_pending\t: %s\n",
			     alrm.pending ? "yes" : "no");
	}

	if (ops->proc)
		p += ops->proc(p);

	return p - page;
}

static int rtc_work_check()
{
	struct device *dev;
	struct rtc_device *rtc = NULL;
	struct timespec		ktime, adjust_ktime;
	struct timespec		check_delta;
	struct rtc_time		tm;
	struct timespec		rtime;

	printk(KERN_ERR "%s\n", __func__);

	rtc = rtc_class_open(CONFIG_RTC_HCTOSYS_DEVICE);

	if (rtc!=NULL){
		getnstimeofday(&ktime);					// kernel_time
		rtc_read_time(rtc, &tm);
		rtc_tm_to_time(&tm, &rtime.tv_sec);		// rtc_time
		rtc_tm_to_time(&tm, &adjust_ktime.tv_sec);
		
		/* RTC precision is 1 second; adjust delta for avg 1/2 sec err */
		set_normalized_timespec(&check_delta, ktime.tv_sec - rtime.tv_sec, ktime.tv_nsec - (NSEC_PER_SEC >> 1));



		if(abs(check_delta.tv_sec) >= 3)
		{
			printk(KERN_ERR "%s: 1 k_t: %10d\n", __func__, ktime.tv_sec);
			printk(KERN_ERR "%s: 2 r_t: %10d\n", __func__, rtime.tv_sec);
			printk(KERN_ERR "%s: 3 check_delta   s: %3d, s: %10d \n", __func__, check_delta.tv_sec, check_delta.tv_nsec);
			printk(KERN_ERR "%s: 4 old_delta   s: %3d, s: %10d \n", __func__, old_delta.tv_sec, old_delta.tv_nsec);
			adjust_ktime.tv_nsec = 0;
			do_settimeofday(&adjust_ktime);

			rtc_read_time(rtc, &tm);		//request by QC
			
			getnstimeofday(&adjust_ktime);
			printk(KERN_ERR "%s: 5 adjust k time is set as: %10d\n", __func__, adjust_ktime.tv_sec);

			set_normalized_timespec(&old_delta, adjust_ktime.tv_sec - rtime.tv_sec, adjust_ktime.tv_nsec - (NSEC_PER_SEC >> 1));
			printk(KERN_ERR "%s: 5 re-set delta,  s:%3d, n:%10d\n", __func__, old_delta.tv_sec,old_delta.tv_nsec);
		}

/**
 * tegra_get_linear_age - helper function to return linear age
 * from Jan 2012.
 *
 * @return
 * 1 - Jan 2012,
 * 2 - Feb 2012,
 * .....
 * 13 - Jan 2013
 */
int tegra_get_linear_age(void)
{
	struct rtc_time tm;
	int year, month, linear_age;
	struct rtc_device *rtc_dev = NULL;
	const char *name = NULL;
	int ret;
	struct device *dev = NULL;

	linear_age = -1;
	year = month = 0;
	dev = class_find_device(rtc_class, NULL, &name, has_readtime);

	if (!dev) {
		pr_err("DVFS: No device with readtime capability\n");
		goto done;
	}

	name = dev_name(dev);

	pr_info("DVFS: Got RTC device name:%s\n", name);

	if (name)
		rtc_dev = rtc_class_open((char *)name);

	if (!rtc_dev) {
		pr_err("DVFS: No RTC device\n");
		goto error_dev;
	}

	ret = rtc_read_time(rtc_dev, &tm);

	if (ret < 0) {
		pr_err("DVFS: Can't read RTC time\n");
		goto error_rtc;
	}

	year = tm.tm_year;
	/*Normalize it to 2012*/
	year -= 112;
	month = tm.tm_mon + 1;

	if (year >= 0)
		linear_age = year * 12 + month;

error_rtc:
	rtc_class_close(rtc_dev);
error_dev:
	put_device(dev);
done:
	return linear_age;

}

static int dump_thread(void *data)
{
	struct rtc_device *rtc;
	struct rtc_time tm;
	int err = 0;
	char log_file_name[100];
	char backup_log_file_name[100];

	pr_at_info("%s: Enter into dump_thread\n", __func__);

	/* Dump the last kernel log */
	/* MX have two rtc devices */
	rtc = rtc_class_open("rtc0");
	if (rtc == NULL) {
		rtc = rtc_class_open("rtc1");
		if (rtc == NULL) {
			pr_err(ATP "%s: can not open rtc devices\n", __func__);
			err = -ENODEV;
		}
	}
	if (!err) {
		err = rtc_read_time(rtc, &tm);
		if (err)
			pr_err(ATP "%s: unable to read the hardware clock\n", __func__);
	}

	sprintf(log_file_name, "%s-%d%02d%02d_%02d%02d%02d", CONFIG_LAST_KMSG_LOG_FILE,
		tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday,
		tm.tm_hour + 8, tm.tm_min, tm.tm_sec);
	pr_at_info("%s: Get log file name: %s\n", __func__, log_file_name);
	err = dump_last_kmsg(log_file_name);
	if (err) {
		pr_err(ATP "%s: Failed dump kernel log to %s\n", __func__, log_file_name);
		sprintf(backup_log_file_name, "%s-%d%02d%02d_%02d%02d%02d", CONFIG_BACKUP_LAST_KMSG_LOG_FILE,
			tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday,
			tm.tm_hour + 8, tm.tm_min, tm.tm_sec);
		pr_at_info("%s: Get backup log file name: %s\n", __func__, backup_log_file_name);
		err = dump_last_kmsg(backup_log_file_name);
		if (err) {
			pr_err(ATP "%s: Failed dump kernel log to %s\n", __func__, backup_log_file_name);
			goto out;
		} else {
			pr_at_info("%s: kernel log file dumped to %s\n", __func__, backup_log_file_name);
		}
	} else {
		pr_at_info("%s: kernel log file dumped to %s\n", __func__, log_file_name);
	}

out:
	complete_and_exit(&dump, 0);

	return err;
}

static ssize_t
time_show(struct device *dev, struct device_attribute *attr, char *buf)
{
	ssize_t retval;
	struct rtc_time tm;

	retval = rtc_read_time(to_rtc_device(dev), &tm);
	if (retval == 0) {
		retval = sprintf(buf, "%02d:%02d:%02d\n",
			tm.tm_hour, tm.tm_min, tm.tm_sec);
	}

	return retval;
}

static ssize_t
date_show(struct device *dev, struct device_attribute *attr, char *buf)
{
	ssize_t retval;
	struct rtc_time tm;

	retval = rtc_read_time(to_rtc_device(dev), &tm);
	if (retval == 0) {
		retval = sprintf(buf, "%04d-%02d-%02d\n",
			tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday);
	}

	return retval;
}

/**
 * alarmtimer_suspend - Suspend time callback
 * @dev: unused
 * @state: unused
 *
 * When we are going into suspend, we look through the bases
 * to see which is the soonest timer to expire. We then
 * set an rtc timer to fire that far into the future, which
 * will wake us from suspend.
 */
static int alarmtimer_suspend(struct device *dev)
{
	struct rtc_time tm;
	ktime_t min, now;
	unsigned long flags;
	struct rtc_device *rtc;
	int i;

	spin_lock_irqsave(&freezer_delta_lock, flags);
	min = freezer_delta;
	freezer_delta = ktime_set(0, 0);
	spin_unlock_irqrestore(&freezer_delta_lock, flags);

	rtc = rtcdev;
	/* If we have no rtcdev, just return */
	if (!rtc)
		return 0;

	/* Find the soonest timer to expire*/
	for (i = 0; i < ALARM_NUMTYPE; i++) {
		struct alarm_base *base = &alarm_bases[i];
		struct timerqueue_node *next;
		ktime_t delta;

		spin_lock_irqsave(&base->lock, flags);
		next = timerqueue_getnext(&base->timerqueue);
		spin_unlock_irqrestore(&base->lock, flags);
		if (!next)
			continue;
		delta = ktime_sub(next->expires, base->gettime());
		if (!min.tv64 || (delta.tv64 < min.tv64))
			min = delta;
	}
	if (min.tv64 == 0)
		return 0;

	/* XXX - Should we enforce a minimum sleep time? */
	WARN_ON(min.tv64 < NSEC_PER_SEC);

	/* Setup an rtc timer to fire that far in the future */
	rtc_timer_cancel(rtc, &rtctimer);
	rtc_read_time(rtc, &tm);
	now = rtc_tm_to_ktime(tm);
	now = ktime_add(now, min);

	rtc_timer_start(rtc, &rtctimer, now, ktime_set(0, 0));

	return 0;
}

static int __init rtc_hctosys(void)
{
	int err = -ENODEV;
	struct rtc_time tm;
	struct timespec64 tv64 = {
		.tv_nsec = NSEC_PER_SEC >> 1,
	};
	struct rtc_device *rtc = rtc_class_open(CONFIG_RTC_HCTOSYS_DEVICE);

	if (rtc == NULL) {
		pr_info("unable to open rtc device (%s)\n",
			CONFIG_RTC_HCTOSYS_DEVICE);
		goto err_open;
	}

	err = rtc_read_time(rtc, &tm);
	if (err) {
		dev_err(rtc->dev.parent,
			"hctosys: unable to read the hardware clock\n");
		goto err_read;

	}

	tv64.tv_sec = rtc_tm_to_time64(&tm);

#if BITS_PER_LONG == 32
	if (tv64.tv_sec > INT_MAX)
		goto err_read;
#endif

	err = do_settimeofday64(&tv64);

	dev_info(rtc->dev.parent,
		"setting system clock to "
		"%d-%02d-%02d %02d:%02d:%02d UTC (%lld)\n",
		tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday,
		tm.tm_hour, tm.tm_min, tm.tm_sec,
		(long long) tv64.tv_sec);

err_read:
	rtc_class_close(rtc);

err_open:
	rtc_hctosys_ret = err;

	return err;
}

late_initcall(rtc_hctosys);

static ssize_t
since_epoch_show(struct device *dev, struct device_attribute *attr, char *buf)
{
	ssize_t retval;
	struct rtc_time tm;

	retval = rtc_read_time(to_rtc_device(dev), &tm);
	if (retval == 0) {
		unsigned long time;
		rtc_tm_to_time(&tm, &time);
		retval = sprintf(buf, "%lu\n", time);
	}

	return retval;
}