ACPI wakeup hooks for rtc-cmos
Remove /proc/acpi/alarm file when the rtc-cmos "wakealarm" file is available.
Instead, provide hooks that rtc-cmos will use.
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Cc: Len Brown <lenb@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/drivers/acpi/glue.c b/drivers/acpi/glue.c
index 4334c20..83768e9 100644
--- a/drivers/acpi/glue.c
+++ b/drivers/acpi/glue.c
@@ -245,6 +245,35 @@
#if defined(CONFIG_RTC_DRV_CMOS) || defined(CONFIG_RTC_DRV_CMOS_MODULE)
+#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);
+}
+
+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
@@ -283,11 +312,17 @@
struct device *dev = get_rtc_dev();
if (dev) {
+ rtc_wake_setup();
+ rtc_info.wake_on = rtc_wake_on;
+ rtc_info.wake_off = rtc_wake_off;
+
rtc_info.rtc_day_alarm = acpi_gbl_FADT.day_alarm;
rtc_info.rtc_mon_alarm = acpi_gbl_FADT.month_alarm;
rtc_info.rtc_century = acpi_gbl_FADT.century;
- /* NOTE: acpi_gbl_FADT->rtcs4 is NOT currently useful */
+ /* NOTE: S4_RTC_WAKE is NOT currently useful to Linux */
+ if (acpi_gbl_FADT.flags & ACPI_FADT_S4_RTC_WAKE)
+ printk("ACPI: RTC can wake from S4\n");
dev->platform_data = &rtc_info;