[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: 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>
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1 changed files with 22 additions and 0 deletions
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@ -307,6 +307,7 @@ static int __init at91_rtc_probe(struct platform_device *pdev)
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return PTR_ERR(rtc);
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return PTR_ERR(rtc);
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}
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}
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platform_set_drvdata(pdev, rtc);
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platform_set_drvdata(pdev, rtc);
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device_init_wakeup(&pdev->dev, 1);
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printk(KERN_INFO "AT91 Real Time Clock driver.\n");
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printk(KERN_INFO "AT91 Real Time Clock driver.\n");
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return 0;
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return 0;
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@ -327,6 +328,7 @@ static int __devexit at91_rtc_remove(struct platform_device *pdev)
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rtc_device_unregister(rtc);
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rtc_device_unregister(rtc);
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platform_set_drvdata(pdev, NULL);
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platform_set_drvdata(pdev, NULL);
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device_init_wakeup(&pdev->dev, 0);
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return 0;
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return 0;
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}
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}
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@ -336,6 +338,7 @@ static int __devexit at91_rtc_remove(struct platform_device *pdev)
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/* AT91RM9200 RTC Power management control */
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/* AT91RM9200 RTC Power management control */
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static struct timespec at91_rtc_delta;
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static struct timespec at91_rtc_delta;
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static u32 at91_rtc_imr;
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static int at91_rtc_suspend(struct platform_device *pdev, pm_message_t state)
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static int at91_rtc_suspend(struct platform_device *pdev, pm_message_t state)
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{
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{
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@ -349,6 +352,18 @@ static int at91_rtc_suspend(struct platform_device *pdev, pm_message_t state)
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rtc_tm_to_time(&tm, &time.tv_sec);
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rtc_tm_to_time(&tm, &time.tv_sec);
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save_time_delta(&at91_rtc_delta, &time);
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save_time_delta(&at91_rtc_delta, &time);
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/* this IRQ is shared with DBGU and other hardware which isn't
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* necessarily doing PM like we are...
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*/
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at91_rtc_imr = at91_sys_read(AT91_RTC_IMR)
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& (AT91_RTC_ALARM|AT91_RTC_SECEV);
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if (at91_rtc_imr) {
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if (device_may_wakeup(&pdev->dev))
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enable_irq_wake(AT91_ID_SYS);
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else
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at91_sys_write(AT91_RTC_IDR, at91_rtc_imr);
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}
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pr_debug("%s(): %4d-%02d-%02d %02d:%02d:%02d\n", __FUNCTION__,
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pr_debug("%s(): %4d-%02d-%02d %02d:%02d:%02d\n", __FUNCTION__,
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1900 + tm.tm_year, tm.tm_mon, tm.tm_mday,
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1900 + tm.tm_year, tm.tm_mon, tm.tm_mday,
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tm.tm_hour, tm.tm_min, tm.tm_sec);
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tm.tm_hour, tm.tm_min, tm.tm_sec);
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@ -367,6 +382,13 @@ static int at91_rtc_resume(struct platform_device *pdev)
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rtc_tm_to_time(&tm, &time.tv_sec);
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rtc_tm_to_time(&tm, &time.tv_sec);
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restore_time_delta(&at91_rtc_delta, &time);
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restore_time_delta(&at91_rtc_delta, &time);
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if (at91_rtc_imr) {
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if (device_may_wakeup(&pdev->dev))
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disable_irq_wake(AT91_ID_SYS);
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else
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at91_sys_write(AT91_RTC_IER, at91_rtc_imr);
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}
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pr_debug("%s(): %4d-%02d-%02d %02d:%02d:%02d\n", __FUNCTION__,
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pr_debug("%s(): %4d-%02d-%02d %02d:%02d:%02d\n", __FUNCTION__,
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1900 + tm.tm_year, tm.tm_mon, tm.tm_mday,
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1900 + tm.tm_year, tm.tm_mon, tm.tm_mday,
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tm.tm_hour, tm.tm_min, tm.tm_sec);
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tm.tm_hour, tm.tm_min, tm.tm_sec);
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