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-rw-r--r--include/linux/parport.h4
1 files changed, 3 insertions, 1 deletions
diff --git a/include/linux/parport.h b/include/linux/parport.h
index f7ff0b0c403..f67f838a3a1 100644
--- a/include/linux/parport.h
+++ b/include/linux/parport.h
@@ -236,12 +236,14 @@ struct pardevice {
/* IEEE1284 information */
-/* IEEE1284 phases */
+/* IEEE1284 phases. These are exposed to userland through ppdev IOCTL
+ * PP[GS]ETPHASE, so do not change existing values. */
enum ieee1284_phase {
IEEE1284_PH_FWD_DATA,
IEEE1284_PH_FWD_IDLE,
IEEE1284_PH_TERMINATE,
IEEE1284_PH_NEGOTIATION,
+ IEEE1284_PH_HBUSY_DNA,
IEEE1284_PH_REV_IDLE,
IEEE1284_PH_HBUSY_DAVAIL,
IEEE1284_PH_REV_DATA,