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[PATCH] AT91rm9200 RTC can issue system wakeup events

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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: David Brownell <dbrownell@users.sourceforge.net>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
David Brownell 2006-09-30 23:28:17 -07:00 committed by Linus Torvalds
parent ff8371ac9a
commit 90b4d648f0
1 changed files with 22 additions and 0 deletions
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22
drivers/rtc/rtc-at91.c
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@ -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);