ACPI / PM: More visible function for retrieving device power states
The function used for retrieving ACPI device power states,
__acpi_bus_get_power(), is now static, because it is only used
internally in drivers/acpi/bus.c. However, it will be used
outside of that file going forward, so rename it to
acpi_device_get_power(), in analogy with acpi_device_set_power(),
add a kerneldoc comment to it and add its header to acpi_bus.h.
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c
index 8e57fc4..0e1441c 100644
--- a/drivers/acpi/bus.c
+++ b/drivers/acpi/bus.c
@@ -200,7 +200,16 @@
}
}
-static int __acpi_bus_get_power(struct acpi_device *device, int *state)
+/**
+ * acpi_device_get_power - Get power state of an ACPI device.
+ * @device: Device to get the power state of.
+ * @state: Place to store the power state of the device.
+ *
+ * This function does not update the device's power.state field, but it may
+ * update its parent's power.state field (when the parent's power state is
+ * unknown and the device's power state turns out to be D0).
+ */
+int acpi_device_get_power(struct acpi_device *device, int *state)
{
int result = ACPI_STATE_UNKNOWN;
@@ -397,7 +406,7 @@
device->power.state = ACPI_STATE_UNKNOWN;
- result = __acpi_bus_get_power(device, &state);
+ result = acpi_device_get_power(device, &state);
if (result)
return result;
@@ -421,7 +430,7 @@
if (result)
return result;
- result = __acpi_bus_get_power(device, &state);
+ result = acpi_device_get_power(device, &state);
if (result)
return result;
diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
index a272c31..9d7c2ca 100644
--- a/include/acpi/acpi_bus.h
+++ b/include/acpi/acpi_bus.h
@@ -331,6 +331,7 @@
unsigned long long *sta);
int acpi_bus_get_status(struct acpi_device *device);
int acpi_bus_set_power(acpi_handle handle, int state);
+int acpi_device_get_power(struct acpi_device *device, int *state);
int acpi_device_set_power(struct acpi_device *device, int state);
int acpi_bus_update_power(acpi_handle handle, int *state_p);
bool acpi_bus_power_manageable(acpi_handle handle);