[ARM] pxa/sa1100: replace wakeup support

Replace wakeup support using the alarm via the SA1100 RTC driver on
SA1100 and PXA platforms.  This allows RTC alarm wakeup to be enabled
via sysfs using the conventional attributes.
Acked-by: NAlessandro Zummo <a.zummo@towertech.it>
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

drivers/rtc/rtc-sa1100.c

@@ -337,6 +337,8 @@ static int sa1100_rtc_probe(struct platform_device *pdev)
 	if (IS_ERR(rtc))
 		return PTR_ERR(rtc);
 
+	device_init_wakeup(&pdev->dev, 1);
+
 	platform_set_drvdata(pdev, rtc);
 
 	return 0;
@@ -352,9 +354,38 @@ static int sa1100_rtc_remove(struct platform_device *pdev)
 	return 0;
 }
 
+#ifdef CONFIG_PM
+static int sa1100_rtc_suspend(struct platform_device *pdev, pm_message_t state)
+{
+	if (pdev->dev.power.power_state.event != state.event) {
+		if (state.event == PM_EVENT_SUSPEND &&
+		    device_may_wakeup(&pdev->dev))
+			enable_irq_wake(IRQ_RTCAlrm);
+
+		pdev->dev.power.power_state = state;
+	}
+	return 0;
+}
+
+static int sa1100_rtc_resume(struct platform_device *pdev)
+{
+	if (pdev->dev.power.power_state.event != PM_EVENT_ON) {
+		if (device_may_wakeup(&pdev->dev))
+			disable_irq_wake(IRQ_RTCAlrm);
+		pdev->dev.power.power_state = PMSG_ON;
+	}
+	return 0;
+}
+#else
+#define sa1100_rtc_suspend	NULL
+#define sa1100_rtc_resume	NULL
+#endif
+
 static struct platform_driver sa1100_rtc_driver = {
 	.probe		= sa1100_rtc_probe,
 	.remove		= sa1100_rtc_remove,
+	.suspend	= sa1100_rtc_suspend,
+	.resume		= sa1100_rtc_resume,
 	.driver		= {
 		.name		= "sa1100-rtc",
 	},