1 files changed, 70 insertions, 0 deletions
diff --git a/drivers/acpi/utils.c b/drivers/acpi/utils.c
index 744371304313..552248b0005b 100644
--- a/drivers/acpi/utils.c
+++ b/drivers/acpi/utils.c
@@ -495,3 +495,73 @@ acpi_handle_printk(const char *level, acpi_handle handle, const char *fmt, ...)
 	kfree(buffer.pointer);
 }
 EXPORT_SYMBOL(acpi_handle_printk);
+
+/**
+ * acpi_has_method: Check whether @handle has a method named @name
+ * @handle: ACPI device handle
+ * @name: name of object or method
+ *
+ * Check whether @handle has a method named @name.
+ */
+bool acpi_has_method(acpi_handle handle, char *name)
+{
+	acpi_handle tmp;
+
+	return ACPI_SUCCESS(acpi_get_handle(handle, name, &tmp));
+}
+EXPORT_SYMBOL(acpi_has_method);
+
+acpi_status acpi_execute_simple_method(acpi_handle handle, char *method,
+				       u64 arg)
+{
+	union acpi_object obj = { .type = ACPI_TYPE_INTEGER };
+	struct acpi_object_list arg_list = { .count = 1, .pointer = &obj, };
+
+	obj.integer.value = arg;
+
+	return acpi_evaluate_object(handle, method, &arg_list, NULL);
+}
+EXPORT_SYMBOL(acpi_execute_simple_method);
+
+/**
+ * acpi_evaluate_ej0: Evaluate _EJ0 method for hotplug operations
+ * @handle: ACPI device handle
+ *
+ * Evaluate device's _EJ0 method for hotplug operations.
+ */
+acpi_status acpi_evaluate_ej0(acpi_handle handle)
+{
+	acpi_status status;
+
+	status = acpi_execute_simple_method(handle, "_EJ0", 1);
+	if (status == AE_NOT_FOUND)
+		acpi_handle_warn(handle, "No _EJ0 support for device\n");
+	else if (ACPI_FAILURE(status))
+		acpi_handle_warn(handle, "Eject failed (0x%x)\n", status);
+
+	return status;
+}
+
+/**
+ * acpi_evaluate_lck: Evaluate _LCK method to lock/unlock device
+ * @handle: ACPI device handle
+ * @lock: lock device if non-zero, otherwise unlock device
+ *
+ * Evaluate device's _LCK method if present to lock/unlock device
+ */
+acpi_status acpi_evaluate_lck(acpi_handle handle, int lock)
+{
+	acpi_status status;
+
+	status = acpi_execute_simple_method(handle, "_LCK", !!lock);
+	if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
+		if (lock)
+			acpi_handle_warn(handle,
+				"Locking device failed (0x%x)\n", status);
+		else
+			acpi_handle_warn(handle,
+				"Unlocking device failed (0x%x)\n", status);
+	}
+
+	return status;
+}