In ACPI platform, if native PME isn't enabled, GPE is used to report wakeup event.
---
drivers/acpi/Kconfig | 9 ++++++
drivers/acpi/bus.c | 15 +++++++++++
drivers/acpi/sleep/wakeup.c | 60 ++++++++++++++++++++++++++++++++++++++++++++
include/acpi/acpi_bus.h | 4 ++
4 files changed, 88 insertions(+)
Index: linux/drivers/acpi/Kconfig
===================================================================
--- linux.orig/drivers/acpi/Kconfig 2009-08-05 11:00:06.000000000 +0800
+++ linux/drivers/acpi/Kconfig 2009-08-19 10:07:05.000000000 +0800
@@ -45,6 +45,15 @@ config ACPI_SLEEP
depends on SUSPEND || HIBERNATION
default y
+config ACPI_GPE_WAKEUP
+ bool "ACPI wakeup event support"
+ depends on PM_SLEEP && EXPERIMENTAL
+ help
+ Enable ACPI to detect wakeup event. For example, PCI device can
+ invoke PME, and in ACPI platform, the PME will invoke a GPE. With
+ the option, we can detect which device invokes wakeup event.
+
+
config ACPI_PROCFS
bool "Deprecated /proc/acpi files"
depends on PROC_FS
Index: linux/drivers/acpi/wakeup.c
===================================================================
--- linux.orig/drivers/acpi/wakeup.c 2009-07-24 11:31:05.000000000 +0800
+++ linux/drivers/acpi/wakeup.c 2009-08-19 10:16:27.000000000 +0800
@@ -124,6 +124,63 @@ void acpi_disable_wakeup_device(u8 sleep
}
}
+#ifdef CONFIG_ACPI_GPE_WAKEUP
+static int acpi_gpe_pme_check(struct acpi_device *dev)
+{
+ struct device *ldev;
+
+ ldev = acpi_get_physical_device(dev->handle);
+ if (!ldev)
+ return -ENODEV;
+ /*
+ * AML code might already clear the event, so ignore the return value.
+ * Actually we can't correctly detect which device invokes GPE if the
+ * event is cleared.
+ */
+ if (ldev->bus->pm && ldev->bus->pm->wakeup_event)
+ ldev->bus->pm->wakeup_event(ldev);
+
+ put_device(ldev);
+ return 0;
+}
+
+static int acpi_gpe_pme_handler(struct notifier_block *nb,
+ unsigned long type, void *data)
+{
+ int ret;
+ acpi_handle handle = data;
+ struct acpi_device *dev;
+
+ if (type != ACPI_NOTIFY_DEVICE_WAKE)
+ return NOTIFY_DONE;
+
+ if (acpi_bus_get_device(handle, &dev))
+ return NOTIFY_DONE;
+
+ ret = acpi_gpe_pme_check(dev);
+
+ acpi_disable_gpe(dev->wakeup.gpe_device, dev->wakeup.gpe_number);
+
+ /* FIXME: spurious interrupt, disables it? */
+ if (ret)
+ printk(KERN_ERR"Spurious GPE %d detected\n",
+ dev->wakeup.gpe_number);
+
+ return NOTIFY_OK;
+}
+
+static struct notifier_block acpi_gpe_pme_nb = {
+ .notifier_call = acpi_gpe_pme_handler,
+};
+
+static void acpi_init_gpe_pme(void)
+{
+ register_acpi_bus_notifier(&acpi_gpe_pme_nb);
+}
+#else
+static inline void acpi_init_gpe_pme(void) {}
+#endif
+
int __init acpi_wakeup_device_init(void)
{
struct list_head *node, *next;
@@ -144,5 +201,7 @@ int __init acpi_wakeup_device_init(void)
dev->wakeup.state.enabled = 1;
}
mutex_unlock(&acpi_device_lock);
+
+ acpi_init_gpe_pme();
return 0;
}
--
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