ACPI_OBJECT args[1] = {
			[0] = { .Integer = {
				.Type = ACPI_TYPE_INTEGER,
				.Value = 1, /* hotkey events */
			} },
		};
		ACPI_OBJECT_LIST arglist = {
			.Count = __arraycount(args),
			.Pointer = args,
		};
		ACPI_BUFFER ret = { .Pointer = &val, .Length = sizeof(val) };

		rv = AcpiEvaluateObject(sc->sc_node->ad_handle, "MHKA",
		    &arglist, &ret);
		if (ACPI_FAILURE(rv)) {
			aprint_error_dev(self, "couldn't evaluate MHKA(1):"
			    " %s\n",
			    AcpiFormatException(rv));
			goto fail;
		}