path: root/include
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authorRafael J. Wysocki <rjw@sisk.pl>2010-06-25 01:18:39 +0200
committerLen Brown <len.brown@intel.com>2010-07-06 22:34:26 -0400
commite8b6f970107cfc9c00cdcdb12ec6c7e135cf379f (patch)
tree20c66dfbc33bd5a0818a679ade11a32e267409ed /include
parentb76df673522d94e3eafcf16935b3d7e5dded3078 (diff)
ACPICA: Introduce acpi_gpe_wakeup()
ACPICA uses reference counters to avoid disabling GPEs too early in case they have been enabled for many times. This is done separately for runtime and for wakeup, but the wakeup GPE reference counter is not really necessary, because GPEs are only enabled to wake up the system at the hardware level by acpi_enter_sleep_state(). Thus it only is necessary to set the corresponding bits in the wakeup enable masks of these GPEs' registers right before the system enters a sleep state. Moreover, the GPE wakeup enable bits can only be set when the target sleep state of the system is known and they need to be cleared immediately after wakeup regardless of how many wakeup devices are associated with a given GPE. On the basis of the above observations, introduce function acpi_gpe_wakeup() to be used for setting or clearing the enable bit corresponding to a given GPE in its enable register's enable_for_wake mask. Modify the ACPI suspend and wakeup code the use acpi_gpe_wakeup() instead of acpi_{enable|disable}_gpe() to set and clear GPE enable bits in their registers' enable_for_wake masks during system transitions to a sleep state and back to the working state, respectively. [This will allow us to drop the third argument of acpi_{enable|disable}_gpe() and simplify the GPE handling code.] Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Signed-off-by: Len Brown <len.brown@intel.com> Signed-off-by: Bob Moore <robert.moore@intel.com> Signed-off-by: Lin Ming <ming.m.lin@intel.com> Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'include')
2 files changed, 3 insertions, 1 deletions
diff --git a/include/acpi/acpixf.h b/include/acpi/acpixf.h
index 8aaa596e120..17396e83e1a 100644
--- a/include/acpi/acpixf.h
+++ b/include/acpi/acpixf.h
@@ -292,6 +292,8 @@ acpi_disable_gpe(acpi_handle gpe_device, u32 gpe_number, u8 gpe_type);
acpi_status acpi_clear_gpe(acpi_handle gpe_device, u32 gpe_number);
+acpi_status acpi_gpe_wakeup(acpi_handle gpe_device, u32 gpe_number, u8 action);
acpi_get_gpe_status(acpi_handle gpe_device,
u32 gpe_number, acpi_event_status *event_status);
diff --git a/include/acpi/actypes.h b/include/acpi/actypes.h
index d55f4a7b824..6a65a94897b 100644
--- a/include/acpi/actypes.h
+++ b/include/acpi/actypes.h
@@ -663,7 +663,7 @@ typedef u32 acpi_event_status;
#define ACPI_GPE_MAX 0xFF
#define ACPI_NUM_GPE 256
-/* Actions for acpi_set_gpe and acpi_hw_low_set_gpe */
+/* Actions for acpi_set_gpe, acpi_gpe_wakeup, acpi_hw_low_set_gpe */