diff --git a/backend_canonselphy.c b/backend_canonselphy.c
index 6d06b3d..c5a3913 100644
--- a/backend_canonselphy.c
+++ b/backend_canonselphy.c
@@ -611,13 +611,14 @@ static void *canonselphy_init(void)
 extern struct dyesub_backend canonselphy_backend;
 
 static int canonselphy_attach(void *vctx, struct libusb_device_handle *dev, int type,
-			      uint8_t endp_up, uint8_t endp_down, uint8_t jobid)
+			      uint8_t endp_up, uint8_t endp_down, int iface, uint8_t jobid)
 {
 	struct canonselphy_ctx *ctx = vctx;
 	int i, num;
 	uint8_t rdbuf[READBACK_LEN];
 
 	UNUSED(jobid);
+	UNUSED(iface);
 
 	ctx->dev = dev;
 	ctx->endp_up = endp_up;
diff --git a/backend_canonselphyneo.c b/backend_canonselphyneo.c
index 75987e9..85047fd 100644
--- a/backend_canonselphyneo.c
+++ b/backend_canonselphyneo.c
@@ -187,13 +187,14 @@ static void *selphyneo_init(void)
 extern struct dyesub_backend selphyneo_backend;
 
 static int selphyneo_attach(void *vctx, struct libusb_device_handle *dev, int type,
-			    uint8_t endp_up, uint8_t endp_down, uint8_t jobid)
+			    uint8_t endp_up, uint8_t endp_down, int iface, uint8_t jobid)
 {
 	struct selphyneo_ctx *ctx = vctx;
 	struct selphyneo_readback rdback;
 	int ret, num;
 
 	UNUSED(jobid);
+	UNUSED(iface);
 
 	ctx->dev = dev;
 	ctx->endp_up = endp_up;
diff --git a/backend_common.c b/backend_common.c
index 0265470..42a74b5 100644
--- a/backend_common.c
+++ b/backend_common.c
@@ -1239,7 +1239,7 @@ bypass:
 	}
 
 	/* Attach backend to device */
-	if (backend->attach(backend_ctx, dev, printer_type, endp_up, endp_down, jobid)) {
+	if (backend->attach(backend_ctx, dev, printer_type, endp_up, endp_down, iface, jobid)) {
 		ERROR("Unable to attach to printer!\n");
 		ret = CUPS_BACKEND_FAILED;
 		goto done_close;
diff --git a/backend_common.h b/backend_common.h
index f021a04..9567a7a 100644
--- a/backend_common.h
+++ b/backend_common.h
@@ -209,7 +209,7 @@ struct dyesub_backend {
 	void (*cmdline_usage)(void);  /* Optional */
 	void *(*init)(void);
 	int  (*attach)(void *ctx, struct libusb_device_handle *dev, int type,
-		       uint8_t endp_up, uint8_t endp_down, uint8_t jobid);
+		       uint8_t endp_up, uint8_t endp_down, int iface, uint8_t jobid);
 	void (*teardown)(void *ctx);
 	int  (*cmdline_arg)(void *ctx, int argc, char **argv);
 	int  (*read_parse)(void *ctx, const void **job, int data_fd, int copies);
diff --git a/backend_dnpds40.c b/backend_dnpds40.c
index 560ff69..307d732 100644
--- a/backend_dnpds40.c
+++ b/backend_dnpds40.c
@@ -66,6 +66,7 @@ struct dnpds40_ctx {
 	struct libusb_device_handle *dev;
 	uint8_t endp_up;
 	uint8_t endp_down;
+	int iface;
 
 	int type;
 
@@ -776,7 +777,7 @@ static int dnpds80dx_query_paper(struct dnpds40_ctx *ctx)
 }
 
 static int dnpds40_attach(void *vctx, struct libusb_device_handle *dev, int type,
-			  uint8_t endp_up, uint8_t endp_down, uint8_t jobid)
+			  uint8_t endp_up, uint8_t endp_down, int iface, uint8_t jobid)
 {
 	struct dnpds40_ctx *ctx = vctx;
 
@@ -786,6 +787,7 @@ static int dnpds40_attach(void *vctx, struct libusb_device_handle *dev, int type
 	ctx->endp_up = endp_up;
 	ctx->endp_down = endp_down;
 	ctx->type = type;
+	ctx->iface = iface;
 
 	if (test_mode < TEST_MODE_NOATTACH) {
 		struct dnpds40_cmd cmd;
diff --git a/backend_hiti.c b/backend_hiti.c
index 7c06986..aa1b905 100644
--- a/backend_hiti.c
+++ b/backend_hiti.c
@@ -859,11 +859,13 @@ static void *hiti_init(void)
 extern struct dyesub_backend hiti_backend;
 
 static int hiti_attach(void *vctx, struct libusb_device_handle *dev, int type,
-			    uint8_t endp_up, uint8_t endp_down, uint8_t jobid)
+		       uint8_t endp_up, uint8_t endp_down, int iface, uint8_t jobid)
 {
 	struct hiti_ctx *ctx = vctx;
 	int ret;
 
+	UNUSED(iface);
+
 	ctx->dev = dev;
 	ctx->endp_up = endp_up;
 	ctx->endp_down = endp_down;
diff --git a/backend_kodak1400.c b/backend_kodak1400.c
index 662c2c3..9e995f2 100644
--- a/backend_kodak1400.c
+++ b/backend_kodak1400.c
@@ -286,11 +286,12 @@ static void *kodak1400_init(void)
 }
 
 static int kodak1400_attach(void *vctx, struct libusb_device_handle *dev, int type,
-			    uint8_t endp_up, uint8_t endp_down, uint8_t jobid)
+			    uint8_t endp_up, uint8_t endp_down, int iface, uint8_t jobid)
 {
 	struct kodak1400_ctx *ctx = vctx;
 
 	UNUSED(jobid);
+	UNUSED(iface);
 
 	ctx->dev = dev;
 	ctx->endp_up = endp_up;
diff --git a/backend_kodak605.c b/backend_kodak605.c
index f787dea..63b9296 100644
--- a/backend_kodak605.c
+++ b/backend_kodak605.c
@@ -358,7 +358,7 @@ static void *kodak605_init(void)
 }
 
 static int kodak605_attach(void *vctx, struct libusb_device_handle *dev, int type,
-			   uint8_t endp_up, uint8_t endp_down, uint8_t jobid)
+			   uint8_t endp_up, uint8_t endp_down, int iface, uint8_t jobid)
 {
 	struct kodak605_ctx *ctx = vctx;
 
@@ -366,6 +366,7 @@ static int kodak605_attach(void *vctx, struct libusb_device_handle *dev, int typ
 	ctx->dev.endp_up = endp_up;
 	ctx->dev.endp_down = endp_down;
 	ctx->dev.type = type;
+	ctx->dev.iface = iface;
 	ctx->dev.error_codes = &error_codes;
 
 	if (ctx->dev.type != P_KODAK_605) {
diff --git a/backend_kodak6800.c b/backend_kodak6800.c
index 20f7572..b262e9f 100644
--- a/backend_kodak6800.c
+++ b/backend_kodak6800.c
@@ -678,10 +678,12 @@ static void *kodak6800_init(void)
 }
 
 static int kodak6800_attach(void *vctx, struct libusb_device_handle *dev, int type,
-			    uint8_t endp_up, uint8_t endp_down, uint8_t jobid)
+			    uint8_t endp_up, uint8_t endp_down, int iface, uint8_t jobid)
 {
 	struct kodak6800_ctx *ctx = vctx;
 
+	UNUSED(iface);
+
 	ctx->dev = dev;
 	ctx->endp_up = endp_up;
 	ctx->endp_down = endp_down;
diff --git a/backend_magicard.c b/backend_magicard.c
index b8ac6a0..4a4ba7a 100644
--- a/backend_magicard.c
+++ b/backend_magicard.c
@@ -437,11 +437,12 @@ static void* magicard_init(void)
 }
 
 static int magicard_attach(void *vctx, struct libusb_device_handle *dev, int type,
-			   uint8_t endp_up, uint8_t endp_down, uint8_t jobid)
+			   uint8_t endp_up, uint8_t endp_down, int iface, uint8_t jobid)
 {
 	struct magicard_ctx *ctx = vctx;
 
 	UNUSED(jobid);
+	UNUSED(iface);
 
 	ctx->dev = dev;
 	ctx->endp_up = endp_up;
diff --git a/backend_mitsu70x.c b/backend_mitsu70x.c
index 7553357..801d72b 100644
--- a/backend_mitsu70x.c
+++ b/backend_mitsu70x.c
@@ -695,10 +695,12 @@ static void *mitsu70x_init(void)
 }
 
 static int mitsu70x_attach(void *vctx, struct libusb_device_handle *dev, int type,
-			   uint8_t endp_up, uint8_t endp_down, uint8_t jobid)
+			   uint8_t endp_up, uint8_t endp_down, int iface, uint8_t jobid)
 {
 	struct mitsu70x_ctx *ctx = vctx;
 
+	UNUSED(iface);
+
 	ctx->jobid = jobid;
 	if (!ctx->jobid)
 		jobid++;
diff --git a/backend_mitsu9550.c b/backend_mitsu9550.c
index 331b93c..e178167 100644
--- a/backend_mitsu9550.c
+++ b/backend_mitsu9550.c
@@ -424,12 +424,13 @@ static void *mitsu9550_init(void)
 }
 
 static int mitsu9550_attach(void *vctx, struct libusb_device_handle *dev, int type,
-			    uint8_t endp_up, uint8_t endp_down, uint8_t jobid)
+			    uint8_t endp_up, uint8_t endp_down, int iface, uint8_t jobid)
 {
 	struct mitsu9550_ctx *ctx = vctx;
 	struct mitsu9550_media media;
 
 	UNUSED(jobid);
+	UNUSED(iface);
 
 	ctx->dev = dev;
 	ctx->endp_up = endp_up;
diff --git a/backend_mitsud90.c b/backend_mitsud90.c
index 70d8abe..0aa8e45 100644
--- a/backend_mitsud90.c
+++ b/backend_mitsud90.c
@@ -513,12 +513,13 @@ static void *mitsud90_init(void)
 }
 
 static int mitsud90_attach(void *vctx, struct libusb_device_handle *dev, int type,
-			    uint8_t endp_up, uint8_t endp_down, uint8_t jobid)
+			   uint8_t endp_up, uint8_t endp_down, int iface, uint8_t jobid)
 {
 	struct mitsud90_ctx *ctx = vctx;
 	struct mitsud90_media_resp resp;
 
 	UNUSED(jobid);
+	UNUSED(iface);
 
 	ctx->dev = dev;
 	ctx->endp_up = endp_up;
diff --git a/backend_mitsup95d.c b/backend_mitsup95d.c
index e1abf02..84155ae 100644
--- a/backend_mitsup95d.c
+++ b/backend_mitsup95d.c
@@ -131,11 +131,12 @@ static int mitsup95d_get_status(struct mitsup95d_ctx *ctx, uint8_t *resp)
 }
 
 static int mitsup95d_attach(void *vctx, struct libusb_device_handle *dev, int type,
-			    uint8_t endp_up, uint8_t endp_down, uint8_t jobid)
+			    uint8_t endp_up, uint8_t endp_down, int iface, uint8_t jobid)
 {
 	struct mitsup95d_ctx *ctx = vctx;
 
 	UNUSED(jobid);
+	UNUSED(iface);
 
 	ctx->dev = dev;
 	ctx->endp_up = endp_up;
diff --git a/backend_shinkos1245.c b/backend_shinkos1245.c
index 1f33fe9..cee40c4 100644
--- a/backend_shinkos1245.c
+++ b/backend_shinkos1245.c
@@ -941,10 +941,12 @@ static void *shinkos1245_init(void)
 }
 
 static int shinkos1245_attach(void *vctx, struct libusb_device_handle *dev, int type,
-			      uint8_t endp_up, uint8_t endp_down, uint8_t jobid)
+			      uint8_t endp_up, uint8_t endp_down, int iface, uint8_t jobid)
 {
 	struct shinkos1245_ctx *ctx = vctx;
 
+	UNUSED(iface);
+
 	ctx->dev = dev;
 	ctx->endp_up = endp_up;
 	ctx->endp_down = endp_down;
diff --git a/backend_shinkos2145.c b/backend_shinkos2145.c
index f00f87a..367e350 100644
--- a/backend_shinkos2145.c
+++ b/backend_shinkos2145.c
@@ -831,7 +831,7 @@ static void *shinkos2145_init(void)
 }
 
 static int shinkos2145_attach(void *vctx, struct libusb_device_handle *dev, int type,
-			      uint8_t endp_up, uint8_t endp_down, uint8_t jobid)
+			      uint8_t endp_up, uint8_t endp_down, int iface, uint8_t jobid)
 {
 	struct shinkos2145_ctx *ctx = vctx;
 
@@ -839,6 +839,7 @@ static int shinkos2145_attach(void *vctx, struct libusb_device_handle *dev, int
 	ctx->dev.endp_up = endp_up;
 	ctx->dev.endp_down = endp_down;
 	ctx->dev.type = type;
+	ctx->dev.iface = iface;
 	ctx->dev.error_codes = &error_codes;
 
 	/* Ensure jobid is sane */
diff --git a/backend_shinkos6145.c b/backend_shinkos6145.c
index 220c259..5347ca4 100644
--- a/backend_shinkos6145.c
+++ b/backend_shinkos6145.c
@@ -986,7 +986,7 @@ static void *shinkos6145_init(void)
 }
 
 static int shinkos6145_attach(void *vctx, struct libusb_device_handle *dev, int type,
-			      uint8_t endp_up, uint8_t endp_down, uint8_t jobid)
+			      uint8_t endp_up, uint8_t endp_down, int iface, uint8_t jobid)
 {
 	struct shinkos6145_ctx *ctx = vctx;
 
@@ -994,6 +994,7 @@ static int shinkos6145_attach(void *vctx, struct libusb_device_handle *dev, int
 	ctx->dev.endp_up = endp_up;
 	ctx->dev.endp_down = endp_down;
 	ctx->dev.type = type;
+	ctx->dev.iface = iface;
 	ctx->dev.error_codes = &error_codes;
 
 	if (type == P_SHINKO_S6145 ||
diff --git a/backend_shinkos6245.c b/backend_shinkos6245.c
index 2e351b2..a156c03 100644
--- a/backend_shinkos6245.c
+++ b/backend_shinkos6245.c
@@ -972,7 +972,7 @@ static void *shinkos6245_init(void)
 }
 
 static int shinkos6245_attach(void *vctx, struct libusb_device_handle *dev, int type,
-			      uint8_t endp_up, uint8_t endp_down, uint8_t jobid)
+			      uint8_t endp_up, uint8_t endp_down, int iface, uint8_t jobid)
 {
 	struct shinkos6245_ctx *ctx = vctx;
 
@@ -980,6 +980,7 @@ static int shinkos6245_attach(void *vctx, struct libusb_device_handle *dev, int
 	ctx->dev.endp_up = endp_up;
 	ctx->dev.endp_down = endp_down;
 	ctx->dev.type = type;
+	ctx->dev.iface = iface;
 
 	if (type == P_KODAK_8810) {
 		ctx->dev.error_codes = &ek8810_error_codes;
diff --git a/backend_sinfonia.h b/backend_sinfonia.h
index 28ecb2a..2726054 100644
--- a/backend_sinfonia.h
+++ b/backend_sinfonia.h
@@ -83,6 +83,7 @@ struct sinfonia_usbdev {
 	uint8_t endp_up;
 	uint8_t endp_down;
 	int type;
+	int iface;
 
 	const struct sinfonia_param *params;
 	int params_count;
diff --git a/backend_sonyupd.c b/backend_sonyupd.c
index 7a43fd4..ecc13bb 100644
--- a/backend_sonyupd.c
+++ b/backend_sonyupd.c
@@ -99,11 +99,12 @@ static void* upd_init(void)
 }
 
 static int upd_attach(void *vctx, struct libusb_device_handle *dev, int type,
-			  uint8_t endp_up, uint8_t endp_down, uint8_t jobid)
+		      uint8_t endp_up, uint8_t endp_down, int iface, uint8_t jobid)
 {
 	struct upd_ctx *ctx = vctx;
 
 	UNUSED(jobid);
+	UNUSED(iface);
 
 	ctx->dev = dev;
 	ctx->endp_up = endp_up;
diff --git a/backend_sonyupdneo.c b/backend_sonyupdneo.c
index b94d2d5..d0d653a 100644
--- a/backend_sonyupdneo.c
+++ b/backend_sonyupdneo.c
@@ -52,6 +52,7 @@ struct updneo_ctx {
 	struct libusb_device_handle *dev;
 	uint8_t endp_up;
 	uint8_t endp_down;
+	int iface;
 	int type;
 
 	int native_bpp;
@@ -72,7 +73,7 @@ static void* updneo_init(void)
 }
 
 static int updneo_attach(void *vctx, struct libusb_device_handle *dev, int type,
-			  uint8_t endp_up, uint8_t endp_down, uint8_t jobid)
+			 uint8_t endp_up, uint8_t endp_down, int iface, uint8_t jobid)
 {
 	struct updneo_ctx *ctx = vctx;
 
@@ -82,6 +83,7 @@ static int updneo_attach(void *vctx, struct libusb_device_handle *dev, int type,
 	ctx->endp_up = endp_up;
 	ctx->endp_down = endp_down;
 	ctx->type = type;
+	ctx->iface = iface;
 
 	if (ctx->type == P_SONY_UPD898) {
 		ctx->marker.color = "#000000";  /* Ie black! */
@@ -268,8 +270,7 @@ static struct deviceid_dict dict[MAX_DICT];
 
 static int updneo_get_status(struct updneo_ctx *ctx)
 {
-	uint8_t iface = 0; // XXX need to extract this.  FML.
-	char *ieee_id = get_device_id(ctx->dev, iface);
+	char *ieee_id = get_device_id(ctx->dev, ctx->iface);
 
 	if (!ieee_id)
 		return CUPS_BACKEND_FAILED;