[PATCH 2/2] acpi: add function to check if poweroff is possible

[Aaron Lu <aaron.lu@intel.com>]

>From ACPI's perspective, a device is powered off if we put it into D3
cold power state. This wrapper inline function can be used to check if
firmware has provided us a way to power off the device during runtime.

Signed-off-by: Aaron Lu <aaron.lu@intel.com>
---
 include/acpi/acpi_bus.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
index 7d20617..932977a 100644
--- a/include/acpi/acpi_bus.h
+++ b/include/acpi/acpi_bus.h
@@ -496,6 +496,11 @@ static inline bool acpi_device_can_wakeup(struct acpi_device *adev)
 	return adev->wakeup.flags.valid;
 }
 
+static inline bool acpi_device_can_poweroff(struct acpi_device *adev)
+{
+	return adev->power.states[ACPI_STATE_D3_COLD].flags.swset;
+}
+
 #else	/* CONFIG_ACPI */
 
 static inline int register_acpi_bus_type(void *bus) { return 0; }
-- 
1.7.12.4