v4.19.13 snapshot.
diff --git a/include/linux/thinkpad_acpi.h b/include/linux/thinkpad_acpi.h
new file mode 100644
index 0000000..9fb3179
--- /dev/null
+++ b/include/linux/thinkpad_acpi.h
@@ -0,0 +1,16 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __THINKPAD_ACPI_H__
+#define __THINKPAD_ACPI_H__
+
+/* These two functions return 0 if success, or negative error code
+ (e g -ENODEV if no led present) */
+
+enum {
+ TPACPI_LED_MUTE,
+ TPACPI_LED_MICMUTE,
+ TPACPI_LED_MAX,
+};
+
+int tpacpi_led_set(int whichled, bool on);
+
+#endif