ACPI: Introduce acpi_bus_power_manageable function
Introduce function acpi_bus_power_manageable() allowing other
(dependent) subsystems to check if ACPI is able to power manage given
device. This may be useful, for example, for PCI device power
management.
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Pavel Machek <pavel@suse.cz>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c
index a6dbcf4..b9b69d9 100644
--- a/drivers/acpi/bus.c
+++ b/drivers/acpi/bus.c
@@ -295,6 +295,17 @@
EXPORT_SYMBOL(acpi_bus_set_power);
+bool acpi_bus_power_manageable(acpi_handle handle)
+{
+ struct acpi_device *device;
+ int result;
+
+ result = acpi_bus_get_device(handle, &device);
+ return result ? false : device->flags.power_manageable;
+}
+
+EXPORT_SYMBOL(acpi_bus_power_manageable);
+
/* --------------------------------------------------------------------------
Event Management
-------------------------------------------------------------------------- */
diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
index db90a74..0c21ea3 100644
--- a/include/acpi/acpi_bus.h
+++ b/include/acpi/acpi_bus.h
@@ -335,6 +335,7 @@
int acpi_bus_get_status(struct acpi_device *device);
int acpi_bus_get_power(acpi_handle handle, int *state);
int acpi_bus_set_power(acpi_handle handle, int state);
+bool acpi_bus_power_manageable(acpi_handle handle);
#ifdef CONFIG_ACPI_PROC_EVENT
int acpi_bus_generate_proc_event(struct acpi_device *device, u8 type, int data);
int acpi_bus_generate_proc_event4(const char *class, const char *bid, u8 type, int data);