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Commit 8be09029 authored by Alexandre Belloni's avatar Alexandre Belloni
Browse files

rtc: test: emulate alarms using timers 



Use timers to emulate alarms. Note that multiple alarms may happen if they
are set more than 15 days after the current RTC time.

Signed-off-by: default avatarAlexandre Belloni <alexandre.belloni@bootlin.com>
parent 4dc2403b

drivers/rtc/rtc-test.c

+52 −4
Original line number Diff line number Diff line
@@ -18,19 +18,49 @@ 
struct rtc_test_data {

	struct rtc_device *rtc;

	time64_t offset;

	struct timer_list alarm;

	bool alarm_en;

};



struct platform_device *pdev[MAX_RTC_TEST];



static int test_rtc_read_alarm(struct device *dev,

	struct rtc_wkalrm *alrm)

static int test_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)

{

	struct rtc_test_data *rtd = dev_get_drvdata(dev);

	time64_t alarm;



	alarm = (rtd->alarm.expires - jiffies) / HZ;

	alarm += ktime_get_real_seconds() + rtd->offset;



	rtc_time64_to_tm(alarm, &alrm->time);

	alrm->enabled = rtd->alarm_en;



	return 0;

}



static int test_rtc_set_alarm(struct device *dev,

	struct rtc_wkalrm *alrm)

static int test_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)

{

	struct rtc_test_data *rtd = dev_get_drvdata(dev);

	ktime_t timeout;

	u64 expires;



	timeout = rtc_tm_to_time64(&alrm->time) - ktime_get_real_seconds();

	timeout -= rtd->offset;



	del_timer(&rtd->alarm);



	expires = jiffies + timeout * HZ;

	if (expires > U32_MAX)

		expires = U32_MAX;



	pr_err("ABE: %s +%d %s\n", __FILE__, __LINE__, __func__);

	rtd->alarm.expires = expires;



	if (alrm->enabled)

		add_timer(&rtd->alarm);



	rtd->alarm_en = alrm->enabled;



	return 0;

}
@@ -54,6 +84,14 @@ static int test_rtc_set_mmss64(struct device *dev, time64_t secs) 


static int test_rtc_alarm_irq_enable(struct device *dev, unsigned int enable)

{

	struct rtc_test_data *rtd = dev_get_drvdata(dev);



	rtd->alarm_en = enable;

	if (enable)

		add_timer(&rtd->alarm);

	else

		del_timer(&rtd->alarm);



	return 0;

}
@@ -65,6 +103,13 @@ static const struct rtc_class_ops test_rtc_ops = { 
	.alarm_irq_enable = test_rtc_alarm_irq_enable,

};



static void test_rtc_alarm_handler(struct timer_list *t)

{

	struct rtc_test_data *rtd = from_timer(rtd, t, alarm);



	rtc_update_irq(rtd->rtc, 1, RTC_AF | RTC_IRQF);

}



static ssize_t test_irq_show(struct device *dev,

				struct device_attribute *attr, char *buf)

{
@@ -111,6 +156,9 @@ static int test_probe(struct platform_device *plat_dev) 
	if (IS_ERR(rtd->rtc))

		return PTR_ERR(rtd->rtc);



	timer_setup(&rtd->alarm, test_rtc_alarm_handler, 0);

	rtd->alarm.expires = 0;



	return 0;

}