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>

2 files changed, 13 insertions, 3 deletions

diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c
index 8e57fc49726e..0e1441cc4d7f 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;
 
diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
index a272c3156999..9d7c2ca0f1f7 100644
--- a/include/acpi/acpi_bus.h
+++ b/include/acpi/acpi_bus.h
@@ -331,6 +331,7 @@ acpi_status acpi_bus_get_status_handle(acpi_handle handle,
                                        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);