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Commit 90b4d648 authored by David Brownell's avatar David Brownell Committed by Linus Torvalds
Browse files

[PATCH] AT91rm9200 RTC can issue system wakeup events 



This lets the at91rm9200 RTC alarm be a system wakeup irq, according to the
setting of /sys/devices/platform/at91_rtc/power/wakeup.  User code can set the
alarm, put the system into a low power mode, and then rely on it waking up no
later than the specified moment.

Signed-off-by: default avatarDavid Brownell <dbrownell@users.sourceforge.net>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent ff8371ac

drivers/rtc/rtc-at91.c

+22 −0
Original line number Diff line number Diff line
@@ -307,6 +307,7 @@ static int __init at91_rtc_probe(struct platform_device *pdev) 
		return PTR_ERR(rtc);

	}

	platform_set_drvdata(pdev, rtc);

	device_init_wakeup(&pdev->dev, 1);



	printk(KERN_INFO "AT91 Real Time Clock driver.\n");

	return 0;
@@ -327,6 +328,7 @@ static int __devexit at91_rtc_remove(struct platform_device *pdev) 


	rtc_device_unregister(rtc);

	platform_set_drvdata(pdev, NULL);

	device_init_wakeup(&pdev->dev, 0);



	return 0;

}
@@ -336,6 +338,7 @@ static int __devexit at91_rtc_remove(struct platform_device *pdev) 
/* AT91RM9200 RTC Power management control */



static struct timespec at91_rtc_delta;

static u32 at91_rtc_imr;



static int at91_rtc_suspend(struct platform_device *pdev, pm_message_t state)

{
@@ -349,6 +352,18 @@ static int at91_rtc_suspend(struct platform_device *pdev, pm_message_t state) 
	rtc_tm_to_time(&tm, &time.tv_sec);

	save_time_delta(&at91_rtc_delta, &time);



	/* this IRQ is shared with DBGU and other hardware which isn't

	 * necessarily doing PM like we are...

	 */

	at91_rtc_imr = at91_sys_read(AT91_RTC_IMR)

			& (AT91_RTC_ALARM|AT91_RTC_SECEV);

	if (at91_rtc_imr) {

		if (device_may_wakeup(&pdev->dev))

			enable_irq_wake(AT91_ID_SYS);

		else

			at91_sys_write(AT91_RTC_IDR, at91_rtc_imr);

	}



	pr_debug("%s(): %4d-%02d-%02d %02d:%02d:%02d\n", __FUNCTION__,

		1900 + tm.tm_year, tm.tm_mon, tm.tm_mday,

		tm.tm_hour, tm.tm_min, tm.tm_sec);
@@ -367,6 +382,13 @@ static int at91_rtc_resume(struct platform_device *pdev) 
	rtc_tm_to_time(&tm, &time.tv_sec);

	restore_time_delta(&at91_rtc_delta, &time);



	if (at91_rtc_imr) {

		if (device_may_wakeup(&pdev->dev))

			disable_irq_wake(AT91_ID_SYS);

		else

			at91_sys_write(AT91_RTC_IER, at91_rtc_imr);

	}



	pr_debug("%s(): %4d-%02d-%02d %02d:%02d:%02d\n", __FUNCTION__,

		1900 + tm.tm_year, tm.tm_mon, tm.tm_mday,

		tm.tm_hour, tm.tm_min, tm.tm_sec);