1 files changed, 32 insertions, 6 deletions

diff --git a/drivers/rtc/rtc-cmos.c b/drivers/rtc/rtc-cmos.c
index 04ecfd2e7c88..b23af0c2a869 100644
--- a/drivers/rtc/rtc-cmos.c
+++ b/drivers/rtc/rtc-cmos.c
@@ -801,7 +801,6 @@ static void __exit cmos_do_remove(struct device *dev)
 static int cmos_suspend(struct device *dev, pm_message_t mesg)
 {
         struct cmos_rtc *cmos = dev_get_drvdata(dev);
-        int             do_wake = device_may_wakeup(dev);
         unsigned char   tmp;
 
         /* only the alarm might be a wakeup event source */
@@ -810,7 +809,7 @@ static int cmos_suspend(struct device *dev, pm_message_t mesg)
         if (tmp & (RTC_PIE|RTC_AIE|RTC_UIE)) {
                 unsigned char   mask;
 
-                if (do_wake)
+                if (device_may_wakeup(dev))
                         mask = RTC_IRQMASK & ~RTC_AIE;
                 else
                         mask = RTC_IRQMASK;
@@ -838,6 +837,17 @@ static int cmos_suspend(struct device *dev, pm_message_t mesg)
         return 0;
 }
 
+/* We want RTC alarms to wake us from e.g. ACPI G2/S5 "soft off", even
+ * after a detour through G3 "mechanical off", although the ACPI spec
+ * says wakeup should only work from G1/S4 "hibernate".  To most users,
+ * distinctions between S4 and S5 are pointless.  So when the hardware
+ * allows, don't draw that distinction.
+ */
+static inline int cmos_poweroff(struct device *dev)
+{
+        return cmos_suspend(dev, PMSG_HIBERNATE);
+}
+
 static int cmos_resume(struct device *dev)
 {
         struct cmos_rtc *cmos = dev_get_drvdata(dev);
@@ -885,6 +895,12 @@ static int cmos_resume(struct device *dev)
 #else
 #define cmos_suspend    NULL
 #define cmos_resume     NULL
+
+static inline int cmos_poweroff(struct device *dev)
+{
+        return -ENOSYS;
+}
+
 #endif
 
 /*----------------------------------------------------------------*/
@@ -904,10 +920,6 @@ static int cmos_resume(struct device *dev)
 static int __devinit
 cmos_pnp_probe(struct pnp_dev *pnp, const struct pnp_device_id *id)
 {
-        /* REVISIT paranoia argues for a shutdown notifier, since PNP
-         * drivers can't provide shutdown() methods to disable IRQs.
-         * Or better yet, fix PNP to allow those methods...
-         */
         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
@@ -943,6 +955,13 @@ static int cmos_pnp_resume(struct pnp_dev *pnp)
 #define cmos_pnp_resume         NULL
 #endif
 
+static void cmos_pnp_shutdown(struct device *pdev)
+{
+        if (system_state == SYSTEM_POWER_OFF && !cmos_poweroff(pdev))
+                return;
+
+        cmos_do_shutdown();
+}
 
 static const struct pnp_device_id rtc_ids[] = {
         { .id = "PNP0b00", },
@@ -962,6 +981,10 @@ static struct pnp_driver cmos_pnp_driver = {
         .flags          = PNP_DRIVER_RES_DO_NOT_CHANGE,
         .suspend        = cmos_pnp_suspend,
         .resume         = cmos_pnp_resume,
+        .driver         = {
+                .name     = (char *)driver_name,
+                .shutdown = cmos_pnp_shutdown,
+        }
 };
 
 #endif  /* CONFIG_PNP */
@@ -987,6 +1010,9 @@ static int __exit cmos_platform_remove(struct platform_device *pdev)
 
 static void cmos_platform_shutdown(struct platform_device *pdev)
 {
+        if (system_state == SYSTEM_POWER_OFF && !cmos_poweroff(&pdev->dev))
+                return;
+
         cmos_do_shutdown();
 }