diff --git a/include/linux/patchkey.h b/include/linux/patchkey.h
new file mode 100644
index 0000000..f581def
--- /dev/null
+++ b/include/linux/patchkey.h
@@ -0,0 +1,26 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * <linux/patchkey.h> -- definition of _PATCHKEY macro
+ *
+ * Copyright (C) 2005 Stuart Brady
+ *
+ * This exists because awe_voice.h defined its own _PATCHKEY and it wasn't
+ * clear whether removing this would break anything in userspace.
+ *
+ * Do not include this file directly.  Please use <sys/soundcard.h> instead.
+ * For kernel code, use <linux/soundcard.h>
+ */
+#ifndef _LINUX_PATCHKEY_H
+#define _LINUX_PATCHKEY_H
+
+#  include <asm/byteorder.h>
+#include <uapi/linux/patchkey.h>
+
+#  if defined(__BIG_ENDIAN)
+#    define _PATCHKEY(id) (0xfd00|id)
+#  elif defined(__LITTLE_ENDIAN)
+#    define _PATCHKEY(id) ((id<<8)|0x00fd)
+#  else
+#    error "could not determine byte order"
+#  endif
+#endif /* _LINUX_PATCHKEY_H */