diff --git a/drivers/rtc/rtc-cmos.c b/drivers/rtc/rtc-cmos.c
index b23af0c..6778f82 100644
--- a/drivers/rtc/rtc-cmos.c
+++ b/drivers/rtc/rtc-cmos.c
@@ -913,6 +913,92 @@
  * predate even PNPBIOS should set up platform_bus devices.
  */
 
+#ifdef	CONFIG_ACPI
+
+#include <linux/acpi.h>
+
+#ifdef	CONFIG_PM
+static u32 rtc_handler(void *context)
+{
+	acpi_clear_event(ACPI_EVENT_RTC);
+	acpi_disable_event(ACPI_EVENT_RTC, 0);
+	return ACPI_INTERRUPT_HANDLED;
+}
+
+static inline void rtc_wake_setup(void)
+{
+	acpi_install_fixed_event_handler(ACPI_EVENT_RTC, rtc_handler, NULL);
+	/*
+	 * After the RTC handler is installed, the Fixed_RTC event should
+	 * be disabled. Only when the RTC alarm is set will it be enabled.
+	 */
+	acpi_clear_event(ACPI_EVENT_RTC);
+	acpi_disable_event(ACPI_EVENT_RTC, 0);
+}
+
+static void rtc_wake_on(struct device *dev)
+{
+	acpi_clear_event(ACPI_EVENT_RTC);
+	acpi_enable_event(ACPI_EVENT_RTC, 0);
+}
+
+static void rtc_wake_off(struct device *dev)
+{
+	acpi_disable_event(ACPI_EVENT_RTC, 0);
+}
+#else
+#define rtc_wake_setup()	do{}while(0)
+#define rtc_wake_on		NULL
+#define rtc_wake_off		NULL
+#endif
+
+/* Every ACPI platform has a mc146818 compatible "cmos rtc".  Here we find
+ * its device node and pass extra config data.  This helps its driver use
+ * capabilities that the now-obsolete mc146818 didn't have, and informs it
+ * that this board's RTC is wakeup-capable (per ACPI spec).
+ */
+static struct cmos_rtc_board_info acpi_rtc_info;
+
+static void __devinit
+cmos_wake_setup(struct device *dev)
+{
+	if (acpi_disabled)
+		return;
+
+	rtc_wake_setup();
+	acpi_rtc_info.wake_on = rtc_wake_on;
+	acpi_rtc_info.wake_off = rtc_wake_off;
+
+	/* workaround bug in some ACPI tables */
+	if (acpi_gbl_FADT.month_alarm && !acpi_gbl_FADT.day_alarm) {
+		dev_dbg(dev, "bogus FADT month_alarm (%d)\n",
+			acpi_gbl_FADT.month_alarm);
+		acpi_gbl_FADT.month_alarm = 0;
+	}
+
+	acpi_rtc_info.rtc_day_alarm = acpi_gbl_FADT.day_alarm;
+	acpi_rtc_info.rtc_mon_alarm = acpi_gbl_FADT.month_alarm;
+	acpi_rtc_info.rtc_century = acpi_gbl_FADT.century;
+
+	/* NOTE:  S4_RTC_WAKE is NOT currently useful to Linux */
+	if (acpi_gbl_FADT.flags & ACPI_FADT_S4_RTC_WAKE)
+		dev_info(dev, "RTC can wake from S4\n");
+
+	dev->platform_data = &acpi_rtc_info;
+
+	/* RTC always wakes from S1/S2/S3, and often S4/STD */
+	device_init_wakeup(dev, 1);
+}
+
+#else
+
+static void __devinit
+cmos_wake_setup(struct device *dev)
+{
+}
+
+#endif
+
 #ifdef	CONFIG_PNP
 
 #include <linux/pnp.h>
@@ -920,6 +1006,8 @@
 static int __devinit
 cmos_pnp_probe(struct pnp_dev *pnp, const struct pnp_device_id *id)
 {
+	cmos_wake_setup(&pnp->dev);
+
 	if (pnp_port_start(pnp,0) == 0x70 && !pnp_irq_valid(pnp,0))
 		/* Some machines contain a PNP entry for the RTC, but
 		 * don't define the IRQ. It should always be safe to
@@ -997,6 +1085,7 @@
 
 static int __init cmos_platform_probe(struct platform_device *pdev)
 {
+	cmos_wake_setup(&pdev->dev);
 	return cmos_do_probe(&pdev->dev,
 			platform_get_resource(pdev, IORESOURCE_IO, 0),
 			platform_get_irq(pdev, 0));