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-rw-r--r--drivers/acpi/bus.c15
1 files changed, 12 insertions, 3 deletions
diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c
index 8e57fc49726..0e1441cc4d7 100644
--- a/drivers/acpi/bus.c
+++ b/drivers/acpi/bus.c
@@ -200,7 +200,16 @@ static const char *state_string(int state)
}
}
-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 @@ int acpi_bus_init_power(struct acpi_device *device)
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 @@ int acpi_bus_update_power(acpi_handle handle, int *state_p)
if (result)
return result;
- result = __acpi_bus_get_power(device, &state);
+ result = acpi_device_get_power(device, &state);
if (result)
return result;