+#ifdef CONFIG_ACPI
+/*
+ * check_lid_device -- check whether @handle is an ACPI LID device.
+ * @handle: ACPI device handle
+ * @level : depth in the ACPI namespace tree
+ * @context: the number of LID device when we find the device
+ * @rv: a return value to fill if desired (Not use)
+ */
+static acpi_status
+check_lid_device(acpi_handle handle, u32 level, void *context,
+ void **return_value)
+{
+ struct acpi_device *acpi_dev;
+ int *lid_present = context;
+
+ acpi_dev = NULL;
+ /* Get the acpi device for device handle */
+ if (acpi_bus_get_device(handle, &acpi_dev) || !acpi_dev) {
+ /* If there is no ACPI device for handle, return */
+ return AE_OK;
+ }
+
+ if (!strncmp(acpi_device_hid(acpi_dev), "PNP0C0D", 7))
+ *lid_present = 1;
+
+ return AE_OK;
+}
+
+/**
+ * check whether there exists the ACPI LID device by enumerating the ACPI
+ * device tree.
+ */
+static int intel_lid_present(void)
+{
+ int lid_present = 0;
+
+ if (acpi_disabled) {
+ /* If ACPI is disabled, there is no ACPI device tree to
+ * check, so assume the LID device would have been present.
+ */
+ return 1;
+ }
+
+ acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
+ ACPI_UINT32_MAX,
+ check_lid_device, &lid_present, NULL);
+
+ return lid_present;
+}
+#else
+static int intel_lid_present(void)
+{
+ /* In the absence of ACPI built in, assume that the LID device would
+ * have been present.
+ */
+ return 1;
+}
+#endif
+