diff --git a/drivers/platform/surface/surface_aggregator_tabletsw.c b/drivers/platform/surface/surface_aggregator_tabletsw.c
index 27d95a6a7851..af8b547cffdc 100644
--- a/drivers/platform/surface/surface_aggregator_tabletsw.c
+++ b/drivers/platform/surface/surface_aggregator_tabletsw.c
@@ -201,6 +201,7 @@ enum ssam_kip_cover_state {
 	SSAM_KIP_COVER_STATE_LAPTOP        = 0x03,
 	SSAM_KIP_COVER_STATE_FOLDED_CANVAS = 0x04,
 	SSAM_KIP_COVER_STATE_FOLDED_BACK   = 0x05,
+	SSAM_KIP_COVER_STATE_BOOK          = 0x06,
 };
 
 static const char *ssam_kip_cover_state_name(struct ssam_tablet_sw *sw, u32 state)
@@ -221,6 +222,9 @@ static const char *ssam_kip_cover_state_name(struct ssam_tablet_sw *sw, u32 stat
 	case SSAM_KIP_COVER_STATE_FOLDED_BACK:
 		return "folded-back";
 
+	case SSAM_KIP_COVER_STATE_BOOK:
+		return "book";
+
 	default:
 		dev_warn(&sw->sdev->dev, "unknown KIP cover state: %u\n", state);
 		return "<unknown>";
@@ -233,6 +237,7 @@ static bool ssam_kip_cover_state_is_tablet_mode(struct ssam_tablet_sw *sw, u32 s
 	case SSAM_KIP_COVER_STATE_DISCONNECTED:
 	case SSAM_KIP_COVER_STATE_FOLDED_CANVAS:
 	case SSAM_KIP_COVER_STATE_FOLDED_BACK:
+	case SSAM_KIP_COVER_STATE_BOOK:
 		return true;
 
 	case SSAM_KIP_COVER_STATE_CLOSED: