[patch] libfprint-0.6.0_vfs0050.patch

libfprint-0.6.0_vfs0050.patch (text/plain), 41.84 KB, created by Matthew Schultz on 2015-08-11 16:05:34 UTC

diff --git a/configure.ac b/configure.ac
index 707f587..58ea9e9 100644
--- a/configure.ac
+++ b/configure.ac
@@ -23,7 +23,7 @@ AC_SUBST(lt_major)
 AC_SUBST(lt_revision)
 AC_SUBST(lt_age)
 
-all_drivers="upekts upektc upeksonly vcom5s uru4000 fdu2000 aes1610 aes1660 aes2501 aes2550 aes2660 aes3500 aes4000 vfs101 vfs301 vfs5011 upektc_img etes603"
+all_drivers="upekts upektc upeksonly vcom5s uru4000 fdu2000 aes1610 aes1660 aes2501 aes2550 aes2660 aes3500 aes4000 vfs101 vfs301 vfs5011 upektc_img etes603 vfs0050"
 
 require_imaging='no'
 require_aeslib='no'
@@ -48,6 +48,7 @@ enable_vfs301='no'
 enable_vfs5011='no'
 enable_upektc_img='no'
 enable_etes603='no'
+enable_vfs0050='no'
 
 AC_ARG_WITH([drivers],[AS_HELP_STRING([--with-drivers],
 	[List of drivers to enable])],
@@ -150,6 +151,10 @@ for driver in `echo ${drivers} | sed -e 's/,/ /g' -e 's/,$//g'`; do
 			AC_DEFINE([ENABLE_ETES603], [], [Build EgisTec ES603 driver])
 			enable_etes603="yes"
 		;;
+		vfs0050)
+			AC_DEFINE([ENABLE_VFS0050], [], [Build Validity VFS0050 driver])
+			enable_vfs0050="yes"
+		;;
 	esac
 done
 
@@ -175,6 +180,7 @@ AM_CONDITIONAL([ENABLE_VFS301], [test "$enable_vfs301" = "yes"])
 AM_CONDITIONAL([ENABLE_VFS5011], [test "$enable_vfs5011" = "yes"])
 AM_CONDITIONAL([ENABLE_UPEKTC_IMG], [test "$enable_upektc_img" = "yes"])
 AM_CONDITIONAL([ENABLE_ETES603], [test "$enable_etes603" = "yes"])
+AM_CONDITIONAL([ENABLE_VFS0050], [test "$enable_vfs0050" = "yes"])
 
 
 PKG_CHECK_MODULES(LIBUSB, [libusb-1.0 >= 0.9.1])
@@ -396,6 +402,11 @@ if test x$enable_etes603 != xno ; then
 else
 	AC_MSG_NOTICE([   etes603 driver disabled])
 fi
+if test x$enable_vfs0050 != xno ; then
+	AC_MSG_NOTICE([** vfs0050 driver enabled])
+else
+	AC_MSG_NOTICE([   vfs0050 driver disabled])
+fi
 if test x$require_aeslib != xno ; then
 	AC_MSG_NOTICE([** aeslib helper functions enabled])
 else
diff --git a/libfprint/Makefile.am b/libfprint/Makefile.am
index b86d0f8..080a350 100644
--- a/libfprint/Makefile.am
+++ b/libfprint/Makefile.am
@@ -21,6 +21,7 @@ VFS301_SRC = drivers/vfs301.c drivers/vfs301_proto.c  drivers/vfs301_proto.h dri
 VFS5011_SRC = drivers/vfs5011.c drivers/vfs5011_proto.h
 UPEKTC_IMG_SRC = drivers/upektc_img.c drivers/upektc_img.h
 ETES603_SRC = drivers/etes603.c
+VFS0050_SRC = drivers/vfs0050.c drivers/vfs0050.h
 
 EXTRA_DIST = \
 	$(UPEKE2_SRC)		\
@@ -42,6 +43,7 @@ EXTRA_DIST = \
 	$(VFS5011_SRC)		\
 	$(UPEKTC_IMG_SRC)	\
 	$(ETES603_SRC)		\
+	$(VFS0050_SRC)		\
 	drivers/aesx660.c	\
 	drivers/aesx660.h	\
 	drivers/aes3k.c 	\
@@ -182,6 +184,10 @@ if ENABLE_ETES603
 DRIVER_SRC += $(ETES603_SRC)
 endif
 
+if ENABLE_VFS0050
+DRIVER_SRC += $(VFS0050_SRC)
+endif
+
 if REQUIRE_PIXMAN
 OTHER_SRC += pixman.c
 libfprint_la_CFLAGS += $(IMAGING_CFLAGS)
diff --git a/libfprint/core.c b/libfprint/core.c
index 2ae7649..8b6fe43 100644
--- a/libfprint/core.c
+++ b/libfprint/core.c
@@ -398,6 +398,9 @@ static struct fp_img_driver * const img_drivers[] = {
 #ifdef ENABLE_ETES603
 	&etes603_driver,
 #endif
+#ifdef ENABLE_VFS0050
+	&vfs0050_driver,
+#endif
 /*#ifdef ENABLE_FDU2000
 	&fdu2000_driver,
 #endif
diff --git a/libfprint/drivers/driver_ids.h b/libfprint/drivers/driver_ids.h
index 4d8414c..8143d01 100644
--- a/libfprint/drivers/driver_ids.h
+++ b/libfprint/drivers/driver_ids.h
@@ -40,6 +40,7 @@ enum {
 	UPEKTC_IMG_ID	= 17,
 	ETES603_ID	= 18,
 	VFS5011_ID	= 19,
+	VFS0050_ID	= 20,
 };
 
 #endif
diff --git a/libfprint/drivers/vfs0050.c b/libfprint/drivers/vfs0050.c
new file mode 100644
index 0000000..6fa7d2a
--- /dev/null
+++ b/libfprint/drivers/vfs0050.c
@@ -0,0 +1,761 @@
+/*
+ * Validity VFS0050 driver for libfprint
+ * Copyright (C) 2015 Konstantin Semenov <[e-mail]>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#define FP_COMPONENT "vfs0050"
+
+#include <errno.h>
+#include <fp_internal.h>
+#include "driver_ids.h"
+
+#include <memory.h>
+
+#include "vfs0050.h"
+
+/* USB functions */
+
+/* Callback for async_write */
+static void async_write_callback(struct libusb_transfer *transfer)
+{
+	struct fpi_ssm *ssm = transfer->user_data;
+	struct fp_img_dev *idev = ssm->priv;
+
+	int transferred = transfer->actual_length, error =
+	    transfer->status, len = transfer->length;
+
+	libusb_free_transfer(transfer);
+
+	if (error != 0) {
+		fp_err("USB write transfer: %s", libusb_error_name(error));
+		fpi_imgdev_session_error(idev, -EIO);
+		fpi_ssm_mark_aborted(ssm, -EIO);
+		return;
+	}
+
+	if (transferred != len) {
+		fp_err("Written only %d of %d bytes", transferred, len);
+		fpi_imgdev_session_error(idev, -EIO);
+		fpi_ssm_mark_aborted(ssm, -EIO);
+		return;
+	}
+
+	fpi_ssm_next_state(ssm);
+}
+
+/* Send data to EP1, the only out endpoint */
+static void async_write(struct fpi_ssm *ssm, void *data, int len)
+{
+	struct fp_img_dev *idev = ssm->priv;
+	struct libusb_device_handle *udev = idev->udev;
+	struct vfs_dev_t *vdev = idev->priv;
+
+	vdev->transfer = libusb_alloc_transfer(0);
+	libusb_fill_bulk_transfer(vdev->transfer, udev, 0x01, data, len,
+				  async_write_callback, ssm, VFS_USB_TIMEOUT);
+	libusb_submit_transfer(vdev->transfer);
+}
+
+/* Callback for async_read */
+static void async_read_callback(struct libusb_transfer *transfer)
+{
+	struct fpi_ssm *ssm = transfer->user_data;
+	struct fp_img_dev *idev = ssm->priv;
+
+	int transferred = transfer->actual_length, error =
+	    transfer->status, len = transfer->length;
+	int ep = transfer->endpoint;
+
+	libusb_free_transfer(transfer);
+
+	if (error != 0) {
+		fp_err("USB read transfer on endpoint %d: %s", ep - 0x80,
+		       libusb_error_name(error));
+		fpi_imgdev_session_error(idev, -EIO);
+		fpi_ssm_mark_aborted(ssm, -EIO);
+		return;
+	}
+
+	if (transferred != len) {
+		fp_err("Received %d instead of %d bytes", transferred, len);
+		fpi_imgdev_session_error(idev, -EIO);
+		fpi_ssm_mark_aborted(ssm, -EIO);
+		return;
+	}
+
+	fpi_ssm_next_state(ssm);
+}
+
+/* Receive data from the given ep and compare with expected */
+static void async_read(struct fpi_ssm *ssm, int ep, void *data, int len)
+{
+	struct fp_img_dev *idev = ssm->priv;
+	struct libusb_device_handle *udev = idev->udev;
+	struct vfs_dev_t *vdev = idev->priv;
+
+	ep += 0x80;
+
+	vdev->transfer = libusb_alloc_transfer(0);
+
+	/* 0x83 is the only interrupt endpoint */
+	if (ep == 0x83)
+		libusb_fill_interrupt_transfer(vdev->transfer, udev, ep, data,
+					       len, async_read_callback, ssm,
+					       VFS_USB_TIMEOUT);
+	else
+		libusb_fill_bulk_transfer(vdev->transfer, udev, ep, data, len,
+					  async_read_callback, ssm,
+					  VFS_USB_TIMEOUT);
+	libusb_submit_transfer(vdev->transfer);
+}
+
+/* Callback for async_read */
+static void async_abort_callback(struct libusb_transfer *transfer)
+{
+	struct fpi_ssm *ssm = transfer->user_data;
+	struct fp_img_dev *idev = ssm->priv;
+
+	int transferred = transfer->actual_length, error = transfer->status;
+	int ep = transfer->endpoint;
+
+	/* Free trash buffer, we don't need it */
+	g_free(transfer->buffer);
+	libusb_free_transfer(transfer);
+
+	/* In normal case endpoint is empty */
+	if (error == LIBUSB_TRANSFER_TIMED_OUT) {
+		fpi_ssm_next_state(ssm);
+		return;
+	}
+
+	if (error != 0) {
+		fp_err("USB write transfer: %s", libusb_error_name(error));
+		fpi_imgdev_session_error(idev, -EIO);
+		fpi_ssm_mark_aborted(ssm, -EIO);
+		return;
+	}
+
+	/* Don't stop process, only print warning */
+	if (transferred > 0)
+		fp_warn("Endpoint %d had extra %d bytes", ep - 0x80,
+			transferred);
+
+	fpi_ssm_jump_to_state(ssm, ssm->cur_state);
+}
+
+/* Receive data from the given ep and compare with expected */
+static void async_abort(struct fpi_ssm *ssm, int ep)
+{
+	struct fp_img_dev *idev = ssm->priv;
+	struct libusb_device_handle *udev = idev->udev;
+	struct vfs_dev_t *vdev = idev->priv;
+
+	int len = VFS_USB_BUFFER_SIZE;
+	unsigned char *data = g_malloc(VFS_USB_BUFFER_SIZE);
+
+	ep += 0x80;
+
+	vdev->transfer = libusb_alloc_transfer(0);
+
+	/* 0x83 is the only interrupt endpoint */
+	if (ep == 0x83)
+		libusb_fill_interrupt_transfer(vdev->transfer, udev, ep, data,
+					       len, async_abort_callback, ssm,
+					       VFS_USB_ABORT_TIMEOUT);
+	else
+		libusb_fill_bulk_transfer(vdev->transfer, udev, ep, data, len,
+					  async_abort_callback, ssm,
+					  VFS_USB_ABORT_TIMEOUT);
+	libusb_submit_transfer(vdev->transfer);
+}
+
+/* Proto functions */
+
+/* SSM loop for clear_ep2 */
+static void clear_ep2_ssm(struct fpi_ssm *ssm)
+{
+	struct fp_img_dev *idev = ssm->priv;
+
+	short result;
+	char command04 = 0x04;
+
+	switch (ssm->cur_state) {
+	case SUBSM1_COMMAND_04:
+		async_write(ssm, &command04, sizeof(command04));
+		break;
+
+	case SUBSM1_RETURN_CODE:
+		async_read(ssm, 1, &result, sizeof(result));
+		break;
+
+	case SUBSM1_ABORT_2:
+		async_abort(ssm, 2);
+		break;
+
+	default:
+		fp_err("Unknown SUBSM1 state");
+		fpi_imgdev_session_error(idev, -EIO);
+		fpi_ssm_mark_aborted(ssm, -EIO);
+	}
+}
+
+/* Send command to clear EP2 */
+static void clear_ep2(struct fpi_ssm *ssm)
+{
+	struct fp_img_dev *idev = ssm->priv;
+
+	struct fpi_ssm *subsm =
+	    fpi_ssm_new(idev->dev, clear_ep2_ssm, SUBSM1_STATES);
+	subsm->priv = idev;
+	fpi_ssm_start_subsm(ssm, subsm);
+}
+
+static void send_control_packet_ssm(struct fpi_ssm *ssm)
+{
+	struct fp_img_dev *idev = ssm->priv;
+	struct vfs_dev_t *vdev = idev->priv;
+
+	short result;
+	unsigned char *commit_result = NULL;
+
+	switch (ssm->cur_state) {
+	case SUBSM2_SEND_CONTROL:
+		async_write(ssm, vdev->control_packet, VFS_CONTROL_PACKET_SIZE);
+		break;
+
+	case SUBSM2_RETURN_CODE:
+		async_read(ssm, 1, &result, sizeof(result));
+		break;
+
+	case SUBSM2_SEND_COMMIT:
+		/* next_receive_* packets could be sent only in pair */
+		if (vdev->control_packet == next_receive_1) {
+			vdev->control_packet = next_receive_2;
+			fpi_ssm_jump_to_state(ssm, SUBSM2_SEND_CONTROL);
+			break;
+		}
+		/* commit_out in Windows differs in each commit, but I send the same each time */
+		async_write(ssm, commit_out, sizeof(commit_out));
+		break;
+
+	case SUBSM2_COMMIT_RESPONSE:
+		commit_result = g_malloc(VFS_COMMIT_RESPONSE_SIZE);
+		async_read(ssm, 1, commit_result, VFS_COMMIT_RESPONSE_SIZE);
+		break;
+
+	case SUBSM2_READ_EMPTY_INTERRUPT:
+		/* I don't know how to check result, it could be different */
+		g_free(commit_result);
+
+		async_read(ssm, 3, vdev->interrupt, VFS_INTERRUPT_SIZE);
+		break;
+
+	case SUBSM2_ABORT_3:
+		/* Check that interrupt is empty */
+		if (memcmp
+		    (vdev->interrupt, empty_interrupt, VFS_INTERRUPT_SIZE)) {
+			fp_err("Unknown SUBSM2 state");
+			fpi_imgdev_session_error(idev, -EIO);
+			fpi_ssm_mark_aborted(ssm, -EIO);
+			break;
+		}
+		async_abort(ssm, 3);
+		break;
+
+	case SUBSM2_CLEAR_EP2:
+		/* After turn_on Windows doesn't clear EP2 */
+		if (vdev->control_packet != turn_on)
+			clear_ep2(ssm);
+		else
+			fpi_ssm_next_state(ssm);
+		break;
+
+	default:
+		fp_err("Unknown SUBSM2 state");
+		fpi_imgdev_session_error(idev, -EIO);
+		fpi_ssm_mark_aborted(ssm, -EIO);
+	}
+}
+
+/* Send device state control packet */
+static void send_control_packet(struct fpi_ssm *ssm)
+{
+	struct fp_img_dev *idev = ssm->priv;
+
+	struct fpi_ssm *subsm =
+	    fpi_ssm_new(idev->dev, send_control_packet_ssm, SUBSM2_STATES);
+	subsm->priv = idev;
+	fpi_ssm_start_subsm(ssm, subsm);
+}
+
+/* Clears all fprint data */
+static void clear_data(struct vfs_dev_t *vdev)
+{
+	if (vdev->data != NULL)
+		g_free(vdev->data);
+	vdev->data = NULL;
+	vdev->memory = vdev->bytes = 0;
+}
+
+#define VFS_NOISE_THRESHOLD 50
+
+/* Processes image before submitting. This function needs to be improved */
+static void prepare_image(struct fp_img *img, struct vfs_line *data)
+{
+	/* TODO: clean other falanges from print */
+
+	/* Noise cleaning. IMHO, it works pretty well
+	   I've not detected cases when it doesn't work or cuts a part of the finger
+	   Noise arises at the end of scan when some water remains on the scanner */
+	while (img->height > 0) {
+		int val1 = data[img->height - 1].noise_hash_1;
+		int val2 = data[img->height - 1].noise_hash_2;
+		if (val1 > VFS_NOISE_THRESHOLD
+		    && val1 < 256 - VFS_NOISE_THRESHOLD
+		    && val2 > VFS_NOISE_THRESHOLD
+		    && val2 < 256 - VFS_NOISE_THRESHOLD)
+			break;
+		--img->height;
+	}
+	fpi_img_resize(img, img->width * img->height);
+
+	/* If image is not good enough */
+	if (img->height < img->width) {
+		img->height = img->width;
+		fpi_img_resize(img, img->width * img->height);
+		memset(img->data, 0, img->width * img->height);
+		return;
+	}
+
+	/* Pixman downscaling(too big images are processed slow or cause segfault during minutae detection)
+	   TODO: make scaling uniform using timeline data from last eight bytes */
+
+	if (img->height > VFS_MAX_HEIGHT)
+		fpi_im_downscale(img, 1.0,
+				 (double)VFS_MAX_HEIGHT / img->height);
+}
+
+/* Creates image from raw scanner data */
+static struct fp_img *get_raw_image(struct vfs_dev_t *vdev)
+{
+	struct vfs_line *data = (struct vfs_line *)vdev->data;
+	int height = vdev->bytes / VFS_IMAGE_WIDTH;
+	int width = VFS_RESULT_IMAGE_WIDTH;
+
+	struct fp_img *img = fpi_img_new(width * height);
+	img->width = width, img->height = height;
+	img->flags = FP_IMG_V_FLIPPED;
+	for (int x = 0; x < height; ++x)
+		memcpy(img->data + x * width, data[x].data, width);
+
+	return img;
+}
+
+/* Processes and submits image after fingerprint received */
+static void submit_image(struct fp_img_dev *idev)
+{
+	struct vfs_dev_t *vdev = idev->priv;
+
+	/* We were not asked to submit image actually */
+	if (!vdev->active)
+		return;
+
+	struct fp_img *img = get_raw_image(vdev);
+	prepare_image(img, (struct vfs_line *)vdev->data);
+
+	fpi_imgdev_image_captured(idev, img);
+
+	/* Finger not on the scanner */
+	fpi_imgdev_report_finger_status(idev, 0);
+}
+
+/* After receiving interrupt from EP3 */
+static void interrupt_callback(struct libusb_transfer *transfer)
+{
+	struct fpi_ssm *ssm = transfer->user_data;
+	struct fp_img_dev *idev = ssm->priv;
+	struct vfs_dev_t *vdev = idev->priv;
+
+	char *interrupt = vdev->interrupt;
+	int error = transfer->status, transferred = transfer->actual_length;
+
+	libusb_free_transfer(transfer);
+
+	vdev->wait_interrupt = 0;
+
+	/* When we have cancelled transfer, error is ok actually */
+	if (!vdev->active && error == LIBUSB_TRANSFER_CANCELLED)
+		return;
+
+	if (error != 0) {
+		fp_err("USB read interrupt transfer: %s",
+		       libusb_error_name(error));
+		fpi_imgdev_session_error(idev, -EIO);
+		fpi_ssm_mark_aborted(ssm, -EIO);
+		return;
+	}
+
+	/* Interrupt size is VFS_INTERRUPT_SIZE bytes in all known cases */
+	if (transferred != VFS_INTERRUPT_SIZE) {
+		fp_err("Unknown interrupt size %d", transferred);
+		libusb_free_transfer(transfer);
+		/* Abort ssm */
+		fpi_imgdev_session_error(idev, -EIO);
+		fpi_ssm_mark_aborted(ssm, -EIO);
+		return;
+	}
+
+	if (memcmp(interrupt, interrupt2, VFS_INTERRUPT_SIZE) == 0) {
+		/* Go to the next ssm stage */
+		fpi_ssm_next_state(ssm);
+		return;
+	}
+
+	if (memcmp(interrupt, interrupt3, VFS_INTERRUPT_SIZE) == 0) {
+		/* Go to the next ssm stage */
+		fpi_ssm_next_state(ssm);
+		return;
+	}
+
+	/* Standard interrupt */
+	if (memcmp(interrupt, interrupt1, VFS_INTERRUPT_SIZE) == 0) {
+		/* Go to the next ssm stage */
+		fpi_ssm_next_state(ssm);
+		return;
+	}
+
+	/* When finger is on the scanner before turn_on */
+	if (interrupt[0] == 0x01) {
+		fp_warn("Finger is already on the scanner");
+
+		/* Go to the next ssm stage */
+		fpi_ssm_next_state(ssm);
+		return;
+	}
+
+	/* TODO: handle all interrupts */
+	fp_err("Unknown interrupt '%02x:%02x:%02x:%02x:%02x'!",
+	       interrupt[0] & 0xff, interrupt[1] & 0xff, interrupt[2] & 0xff,
+	       interrupt[3] & 0xff, interrupt[4] & 0xff);
+
+	/* Abort ssm */
+	fpi_imgdev_session_error(idev, -EIO);
+	fpi_ssm_mark_aborted(ssm, -EIO);
+}
+
+static void receive_callback(struct libusb_transfer *transfer)
+{
+	struct fpi_ssm *ssm = transfer->user_data;
+	struct fp_img_dev *idev = ssm->priv;
+	struct vfs_dev_t *vdev = idev->priv;
+
+	int transferred = transfer->actual_length, error = transfer->status;
+
+	libusb_free_transfer(transfer);
+
+	if (error != 0 && error != LIBUSB_TRANSFER_TIMED_OUT) {
+		fp_err("USB read transfer: %s", libusb_error_name(error));
+
+		fpi_imgdev_session_error(idev, -EIO);
+		fpi_ssm_mark_aborted(ssm, -EIO);
+		return;
+	}
+
+	/* Check if fingerprint data is over */
+	if (transferred == 0)
+		fpi_ssm_next_state(ssm);
+	else {
+		/* We need more data */
+		vdev->bytes += transferred;
+		fpi_ssm_jump_to_state(ssm, ssm->cur_state);
+	}
+}
+
+/* Stub to keep SSM alive when waiting an interrupt */
+static void wait_interrupt(void *data)
+{
+	struct fpi_ssm *ssm = data;
+	struct fp_img_dev *idev = ssm->priv;
+	struct vfs_dev_t *vdev = idev->priv;
+
+	/* Keep sleeping while this flag is on */
+	if (vdev->wait_interrupt)
+		fpi_ssm_jump_to_state(ssm, ssm->cur_state);
+}
+
+/* SSM stub to prepare device to another scan after orange light was on */
+static void another_scan(void *data)
+{
+	struct fpi_ssm *ssm = data;
+	fpi_ssm_jump_to_state(ssm, SSM_TURN_ON);
+}
+
+/* Another SSM stub to continue after waiting for probable vdev->active changes */
+static void scan_completed(void *data)
+{
+	struct fpi_ssm *ssm = data;
+	fpi_ssm_next_state(ssm);
+}
+
+/* Main SSM loop */
+static void activate_ssm(struct fpi_ssm *ssm)
+{
+	struct fp_img_dev *idev = ssm->priv;
+	struct libusb_device_handle *udev = idev->udev;
+	struct vfs_dev_t *vdev = idev->priv;
+
+	switch (ssm->cur_state) {
+	case SSM_INITIAL_ABORT_1:
+		async_abort(ssm, 1);
+		break;
+
+	case SSM_INITIAL_ABORT_2:
+		async_abort(ssm, 2);
+		break;
+
+	case SSM_INITIAL_ABORT_3:
+		async_abort(ssm, 3);
+		break;
+
+	case SSM_CLEAR_EP2:
+		clear_ep2(ssm);
+		break;
+
+	case SSM_TURN_OFF:
+		/* Set control_packet argument */
+		vdev->control_packet = turn_off;
+
+		send_control_packet(ssm);
+		break;
+
+	case SSM_TURN_ON:
+		if (!vdev->active) {
+			/* The only correct exit */
+			fpi_ssm_mark_completed(ssm);
+
+			if (vdev->need_report) {
+				fpi_imgdev_deactivate_complete(idev);
+				vdev->need_report = 0;
+			}
+			break;
+		}
+		/* Set control_packet argument */
+		vdev->control_packet = turn_on;
+
+		send_control_packet(ssm);
+		break;
+
+	case SSM_ASK_INTERRUPT:
+		/* Activated, light must be blinking now */
+
+		/* If we first time here, report that activate completed */
+		if (vdev->need_report) {
+			fpi_imgdev_activate_complete(idev, 0);
+			vdev->need_report = 0;
+		}
+
+		/* Asyncronously enquire an interrupt */
+		vdev->transfer = libusb_alloc_transfer(0);
+		libusb_fill_interrupt_transfer(vdev->transfer, udev, 0x83,
+					       vdev->interrupt,
+					       VFS_INTERRUPT_SIZE,
+					       interrupt_callback, ssm, 0);
+		libusb_submit_transfer(vdev->transfer);
+
+		/* This flag could be turned off only in callback function */
+		vdev->wait_interrupt = 1;
+
+		/* I've put it here to be sure that data is cleared */
+		clear_data(vdev);
+
+		fpi_ssm_next_state(ssm);
+		break;
+
+	case SSM_WAIT_INTERRUPT:
+		/* Check if user had interrupted the process */
+		if (!vdev->active) {
+			libusb_cancel_transfer(vdev->transfer);
+			fpi_ssm_jump_to_state(ssm, SSM_CLEAR_EP2);
+			break;
+		}
+
+		if (vdev->wait_interrupt)
+			fpi_timeout_add(VFS_SSM_TIMEOUT, wait_interrupt, ssm);
+		break;
+
+	case SSM_RECEIVE_FINGER:
+		if (vdev->memory == 0) {
+			/* Initialize fingerprint buffer */
+			if (vdev->data != NULL)
+				g_free(vdev->data);
+			vdev->memory = VFS_USB_BUFFER_SIZE;
+			vdev->data = g_malloc(vdev->memory);
+			vdev->bytes = 0;
+
+			/* Finger is on the scanner */
+			fpi_imgdev_report_finger_status(idev, 1);
+		}
+
+		/* Increase buffer size while it's insufficient */
+		while (vdev->bytes + VFS_USB_BUFFER_SIZE > vdev->memory) {
+			vdev->memory <<= 1;
+			vdev->data =
+			    (unsigned char *)g_realloc(vdev->data,
+						       vdev->memory);
+		}
+
+		/* Receive chunk of data */
+		vdev->transfer = libusb_alloc_transfer(0);
+		libusb_fill_bulk_transfer(vdev->transfer, udev, 0x82,
+					  vdev->data + vdev->bytes,
+					  VFS_USB_BUFFER_SIZE, receive_callback,
+					  ssm, VFS_USB_TIMEOUT);
+		libusb_submit_transfer(vdev->transfer);
+		break;
+
+	case SSM_SUBMIT_IMAGE:
+		submit_image(idev);
+		clear_data(vdev);
+
+		/* Wait for probable vdev->active changing */
+		fpi_timeout_add(VFS_SSM_TIMEOUT, scan_completed, ssm);
+		break;
+
+	case SSM_NEXT_RECEIVE:
+		if (!vdev->active) {
+			/* It's the last scan */
+			fpi_ssm_jump_to_state(ssm, SSM_CLEAR_EP2);
+			break;
+		}
+
+		/* Set control_packet argument */
+		vdev->control_packet = next_receive_1;
+
+		send_control_packet(ssm);
+		break;
+
+	case SSM_WAIT_ANOTHER_SCAN:
+		/* Orange light is on now */
+		fpi_timeout_add(VFS_SSM_ORANGE_TIMEOUT, another_scan, ssm);
+		break;
+
+	default:
+		fp_err("Unknown state");
+		fpi_imgdev_session_error(idev, -EIO);
+		fpi_ssm_mark_aborted(ssm, -EIO);
+	}
+}
+
+/* Driver functions */
+
+/* Activate device */
+static int dev_activate(struct fp_img_dev *idev, enum fp_imgdev_state state)
+{
+	struct vfs_dev_t *vdev = idev->priv;
+
+	/* Initialize flags */
+	vdev->active = 1;
+	vdev->need_report = 1;
+
+	struct fpi_ssm *ssm = fpi_ssm_new(idev->dev, activate_ssm, SSM_STATES);
+	ssm->priv = idev;
+	fpi_ssm_start(ssm, fpi_ssm_free);
+	return 0;
+}
+
+/* Deactivate device */
+static void dev_deactivate(struct fp_img_dev *idev)
+{
+	struct vfs_dev_t *vdev = idev->priv;
+
+	/* Initialize flags */
+	vdev->active = 0;
+	vdev->need_report = 1;
+}
+
+/* Callback for dev_open ssm */
+static void dev_open_callback(struct fpi_ssm *ssm)
+{
+	/* Notify open complete */
+	fpi_imgdev_open_complete((struct fp_img_dev *)ssm->priv, 0);
+	fpi_ssm_free(ssm);
+}
+
+/* Open device */
+static int dev_open(struct fp_img_dev *idev, unsigned long driver_data)
+{
+	/* Claim usb interface */
+	int error = libusb_claim_interface(idev->udev, 0);
+	if (error < 0) {
+		/* Interface not claimed, return error */
+		fp_err("could not claim interface 0");
+		return error;
+	}
+
+	/* Initialize private structure */
+	struct vfs_dev_t *vdev = g_malloc0(sizeof(struct vfs_dev_t));
+	idev->priv = vdev;
+
+	/* Clearing previous device state */
+	struct fpi_ssm *ssm = fpi_ssm_new(idev->dev, activate_ssm, SSM_STATES);
+	ssm->priv = idev;
+	fpi_ssm_start(ssm, dev_open_callback);
+	return 0;
+}
+
+/* Close device */
+static void dev_close(struct fp_img_dev *idev)
+{
+	/* Release private structure */
+	g_free(idev->priv);
+
+	/* Release usb interface */
+	libusb_release_interface(idev->udev, 0);
+
+	/* Notify close complete */
+	fpi_imgdev_close_complete(idev);
+}
+
+/* Usb id table of device */
+static const struct usb_id id_table[] = {
+	{.vendor = 0x138a,.product = 0x0050},
+	{0, 0, 0,},
+};
+
+/* Device driver definition */
+struct fp_img_driver vfs0050_driver = {
+	/* Driver specification */
+	.driver = {
+		   .id = VFS0050_ID,
+		   .name = FP_COMPONENT,
+		   .full_name = "Validity VFS0050",
+		   .id_table = id_table,
+		   .scan_type = FP_SCAN_TYPE_SWIPE,
+		   },
+
+	/* Image specification */
+	.flags = 0,
+	.img_width = VFS_RESULT_IMAGE_WIDTH,
+	.img_height = -1,
+	.bz3_threshold = 24,
+
+	/* Routine specification */
+	.open = dev_open,
+	.close = dev_close,
+	.activate = dev_activate,
+	.deactivate = dev_deactivate,
+};
diff --git a/libfprint/drivers/vfs0050.h b/libfprint/drivers/vfs0050.h
new file mode 100644
index 0000000..cb5f786
--- /dev/null
+++ b/libfprint/drivers/vfs0050.h
@@ -0,0 +1,374 @@
+/*
+ * Validity VFS0050 driver for libfprint
+ * Copyright (C) 2015 Konstantin Semenov <[e-mail]>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/* Timeout for all send/recv operations, except interrupt waiting and abort */
+#define VFS_USB_TIMEOUT 100
+/* Timeout for usb abort */
+#define VFS_USB_ABORT_TIMEOUT 20
+/* Default timeout for SSM timers */
+#define VFS_SSM_TIMEOUT 100
+/* Timeout for orange light */
+#define VFS_SSM_ORANGE_TIMEOUT 700
+
+/* Buffer size for abort and fprint receiving */
+#define VFS_USB_BUFFER_SIZE 65536
+
+/* Do not touch this parameters! */
+
+/* Width from scanner including extra data */
+#define VFS_IMAGE_WIDTH 148
+/* Only fprint image width from scanner */
+#define VFS_RESULT_IMAGE_WIDTH 100
+/* Maximum result image height */
+#define VFS_MAX_HEIGHT 600
+/* Size of control packets: turn_on, turn_off, next_receive_*  */
+#define VFS_CONTROL_PACKET_SIZE 125
+/* Size of result of commit */
+#define VFS_COMMIT_RESPONSE_SIZE 1106
+/* Size of interrupt from EP3 */
+#define VFS_INTERRUPT_SIZE 5
+
+/* Fingerprint horizontal line */
+struct vfs_line {
+	/* It must be always 0x01 */
+	unsigned char _0x01;
+	/* It must be always 0xfe */
+	unsigned char _0xfe;
+
+	/* line number starting from some number in Little-Endian */
+	unsigned short id;
+
+	/* Some hashes which are useful to detect noise */
+	unsigned char noise_hash_1;
+	unsigned char noise_hash_2;
+
+	/* The first byte of _somedata is always 0x00, the second is strange useless cyclic line number */
+	unsigned short _somedata;
+
+	/* Fingerprint image */
+	unsigned char data[VFS_RESULT_IMAGE_WIDTH];
+
+	/* Narrow fingerprint part from the center, diagonally, currently it's skipped */
+	unsigned char extra[32];
+
+	/* scan_data is 0xfb except some rare cases, it seems that it's timeline but currently it's skipped too */
+	unsigned char scan_data[8];
+} __attribute__ ((__packed__));
+
+/* The main driver structure */
+struct vfs_dev_t {
+	/* One if we were asked to read fingerprint, zero otherwise */
+	char active;
+
+	/* Control packet parameter for send_control_packet */
+	unsigned char *control_packet;
+
+	/* Current async transfer */
+	struct libusb_transfer *transfer;
+
+	/* Should we call fpi_imgdev_activate_complete or fpi_imgdev_deactivate_complete */
+	char need_report;
+
+	/* Should we wait more for interrupt */
+	char wait_interrupt;
+
+	/* Received fingerprint data */
+	unsigned char *data;
+
+	/* Current number of received bytes and current memory used by data */
+	int bytes, memory;
+
+	/* Received interrupt data */
+	unsigned char interrupt[8];
+};
+
+/* SSM states for clear_ep2 */
+enum SUBSM1 {
+	SUBSM1_COMMAND_04,
+	SUBSM1_RETURN_CODE,
+	SUBSM1_ABORT_2,
+
+	SUBSM1_STATES,
+};
+
+/* SSM states for control */
+enum SUBSM2 {
+	SUBSM2_SEND_CONTROL,
+	SUBSM2_RETURN_CODE,	/* If next_receive, send another control packet */
+
+	SUBSM2_SEND_COMMIT,
+	SUBSM2_COMMIT_RESPONSE,
+	SUBSM2_READ_EMPTY_INTERRUPT,
+	SUBSM2_ABORT_3,
+	SUBSM2_CLEAR_EP2,
+
+	SUBSM2_STATES,
+};
+
+/* SSM states for activate_ssm */
+enum SSM_STATE {
+	SSM_INITIAL_ABORT_1,
+	SSM_INITIAL_ABORT_2,
+	SSM_INITIAL_ABORT_3,
+	SSM_CLEAR_EP2,
+	SSM_TURN_OFF,
+
+	/* Here the device is turned off; if not active, complete ssm */
+	SSM_TURN_ON,
+
+	SSM_ASK_INTERRUPT,
+	SSM_WAIT_INTERRUPT,
+
+	SSM_RECEIVE_FINGER,
+	SSM_SUBMIT_IMAGE,
+
+	/* If not active, jump to CLEAR_EP2 */
+	SSM_NEXT_RECEIVE,
+	SSM_WAIT_ANOTHER_SCAN,
+	/* Jump to TURN_ON */
+
+	SSM_STATES
+};
+
+/* Blocks of data from USB sniffer */
+
+/* Turns on the light */
+static unsigned char turn_on[] = {
+	0x39, 0x20, 0xBF, 0x02, 0x00, 0xF4, 0x01, 0x00, 0x00, 0x01, 0xD1, 0x00,
+	    0x20, 0xD1, 0xD1, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xF4, 0x01, 0x00,
+	    0x00, 0x01, 0x00, 0x00,
+	0x20, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	    0x00, 0xF4, 0x01, 0x00,
+	0x00, 0x02, 0x00, 0x00, 0x20, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	    0x00, 0x00, 0x00, 0x00,
+	0x00, 0xF4, 0x01, 0x00, 0x00, 0x02, 0xD1, 0x00, 0x20, 0x00, 0x00, 0x00,
+	    0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	    0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	    0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	    0x00,
+};
+
+/* Power off */
+static unsigned char turn_off[] = {
+	0x39, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	    0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	    0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	    0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	    0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	    0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	    0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	    0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	    0x00,
+};
+
+/* Turns on orange light */
+static unsigned char next_receive_1[] = {
+	0x39, 0xB8, 0x0B, 0x00, 0x00, 0xB8, 0x0B, 0x00, 0x00, 0x01, 0xD1, 0x00,
+	    0x20, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0xD1, 0xD1, 0x00, 0x00, 0x00, 0x00, 0x00,
+	    0x00, 0x01, 0x00, 0x00,
+	0x20, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	    0x00, 0x00, 0x00, 0x00,
+	0x00, 0x02, 0x00, 0x00, 0x20, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	    0x00, 0x00, 0x00, 0x00,
+	0x00, 0xB8, 0x0B, 0x00, 0x00, 0x02, 0xD1, 0x00, 0x20, 0x00, 0x00, 0x00,
+	    0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	    0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	    0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	    0x00,
+};
+
+/* Packet directly after next_receive_1 */
+static unsigned char next_receive_2[] = {
+	0x39, 0xE8, 0x03, 0x00, 0x00, 0xE8, 0x03, 0x00, 0x00, 0x01, 0xD1, 0x00,
+	    0x20, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0xD1, 0xD1, 0x00, 0x00, 0x00, 0x00, 0x00,
+	    0x00, 0x01, 0x00, 0x00,
+	0x20, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	    0x00, 0x00, 0x00, 0x00,
+	0x00, 0x02, 0x00, 0x00, 0x20, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	    0x00, 0x00, 0x00, 0x00,
+	0x00, 0xE8, 0x03, 0x00, 0x00, 0x02, 0xD1, 0x00, 0x20, 0x00, 0x00, 0x00,
+	    0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	    0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	    0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	    0x00,
+};
+
+/* Commit message */
+static unsigned char commit_out[] = {
+	0x02, 0x94, 0x00, 0x00, 0x00, 0x20, 0x00, 0x08, 0x00, 0x2C, 0x03, 0x00,
+	    0x30, 0x1B, 0x00, 0x00,
+	0x00, 0x20, 0x00, 0x08, 0x00, 0x20, 0x03, 0x00, 0x30, 0x3D, 0x10, 0x00,
+	    0x00, 0x20, 0x00, 0x08,
+	0x00, 0x18, 0x03, 0x00, 0x30, 0x00, 0x00, 0x00, 0x00, 0x20, 0x00, 0x08,
+	    0x00, 0x24, 0x03, 0x00,
+	0x30, 0x08, 0x00, 0x00, 0x00, 0x20, 0x00, 0x08, 0x00, 0x28, 0x03, 0x00,
+	    0x30, 0x08, 0x00, 0x00,
+	0x00, 0x20, 0x00, 0x08, 0x00, 0x30, 0x03, 0x00, 0x30, 0x00, 0x00, 0x00,
+	    0x00, 0x20, 0x00, 0x08,
+	0x00, 0x38, 0x03, 0x00, 0x30, 0x00, 0x00, 0x00, 0x00, 0x20, 0x00, 0x08,
+	    0x00, 0x3C, 0x03, 0x00,
+	0x30, 0x00, 0x00, 0x00, 0x00, 0x20, 0x00, 0x08, 0x00, 0x44, 0x03, 0x00,
+	    0x30, 0x14, 0x00, 0x00,
+	0x00, 0x20, 0x00, 0x08, 0x00, 0x48, 0x03, 0x00, 0x30, 0x01, 0x04, 0x02,
+	    0x00, 0x20, 0x00, 0x08,
+	0x00, 0x4C, 0x03, 0x00, 0x30, 0x01, 0x0C, 0x02, 0x00, 0x20, 0x00, 0x08,
+	    0x00, 0x54, 0x03, 0x00,
+	0x30, 0x20, 0x00, 0x00, 0x00, 0x20, 0x00, 0x08, 0x00, 0x5C, 0x03, 0x00,
+	    0x30, 0x90, 0x01, 0x02,
+	0x00, 0x20, 0x00, 0x08, 0x00, 0x60, 0x03, 0x00, 0x30, 0x2C, 0x01, 0x19,
+	    0x00, 0x20, 0x00, 0x08,
+	0x00, 0x64, 0x03, 0x00, 0x30, 0x00, 0x00, 0x00, 0x00, 0x20, 0x00, 0x08,
+	    0x00, 0x6C, 0x03, 0x00,
+	0x30, 0x1E, 0x00, 0x00, 0x00, 0x20, 0x00, 0x08, 0x00, 0x70, 0x03, 0x00,
+	    0x30, 0x21, 0x80, 0x00,
+	0x00, 0x20, 0x00, 0x08, 0x00, 0x78, 0x03, 0x00, 0x30, 0x09, 0x00, 0x02,
+	    0x00, 0x20, 0x00, 0x08,
+	0x00, 0x7C, 0x03, 0x00, 0x30, 0x0B, 0x00, 0x19, 0x00, 0x20, 0x00, 0x08,
+	    0x00, 0x80, 0x03, 0x00,
+	0x30, 0x00, 0x00, 0x00, 0x00, 0x20, 0x00, 0x08, 0x00, 0x84, 0x03, 0x00,
+	    0x30, 0x3A, 0x00, 0x00,
+	0x00, 0x20, 0x00, 0x08, 0x00, 0x88, 0x03, 0x00, 0x30, 0x14, 0x00, 0x00,
+	    0x00, 0x20, 0x00, 0x08,
+	0x00, 0x8C, 0x03, 0x00, 0x30, 0x02, 0x00, 0x00, 0x00, 0x20, 0x00, 0x08,
+	    0x00, 0x90, 0x03, 0x00,
+	0x30, 0x02, 0x00, 0x00, 0x00, 0x20, 0x00, 0x08, 0x00, 0x94, 0x03, 0x00,
+	    0x30, 0x08, 0x00, 0x00,
+	0x00, 0x20, 0x00, 0x08, 0x00, 0x98, 0x03, 0x00, 0x30, 0x00, 0x00, 0xA1,
+	    0x01, 0x20, 0x00, 0x08,
+	0x00, 0x9C, 0x03, 0x00, 0x30, 0x00, 0x00, 0xA1, 0x01, 0x20, 0x00, 0x08,
+	    0x00, 0xA8, 0x03, 0x00,
+	0x30, 0x64, 0x01, 0x00, 0x00, 0x20, 0x00, 0x08, 0x00, 0xAC, 0x03, 0x00,
+	    0x30, 0x64, 0x01, 0x00,
+	0x00, 0x20, 0x00, 0x08, 0x00, 0xB0, 0x03, 0x00, 0x30, 0x00, 0x01, 0x00,
+	    0x00, 0x20, 0x00, 0x08,
+	0x00, 0xB4, 0x03, 0x00, 0x30, 0x00, 0x01, 0x00, 0x00, 0x20, 0x00, 0x08,
+	    0x00, 0xB8, 0x03, 0x00,
+	0x30, 0x05, 0x00, 0x00, 0x00, 0x20, 0x00, 0x08, 0x00, 0xBC, 0x03, 0x00,
+	    0x30, 0x05, 0x00, 0x00,
+	0x00, 0x20, 0x00, 0x08, 0x00, 0xC0, 0x03, 0x00, 0x30, 0x00, 0x00, 0x00,
+	    0x00, 0x20, 0x00, 0x08,
+	0x00, 0x84, 0x03, 0x00, 0x30, 0x3B, 0x00, 0x00, 0x00, 0x20, 0x00, 0x08,
+	    0x00, 0x08, 0x07, 0x00,
+	0x30, 0x03, 0x00, 0x00, 0x00, 0x20, 0x00, 0x08, 0x00, 0x0C, 0x07, 0x00,
+	    0x30, 0x00, 0x00, 0x00,
+	0x00, 0x20, 0x00, 0x08, 0x00, 0x14, 0x07, 0x00, 0x30, 0x20, 0x00, 0x00,
+	    0x00, 0x20, 0x00, 0x08,
+	0x00, 0x1C, 0x07, 0x00, 0x30, 0x1A, 0x00, 0x00, 0x00, 0x20, 0x00, 0x08,
+	    0x00, 0x70, 0x0D, 0x00,
+	0x30, 0x01, 0x00, 0x00, 0x00, 0x25, 0x00, 0x28, 0x00, 0x10, 0x00, 0x00,
+	    0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x20, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	    0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	    0x00, 0x00, 0x00, 0x00,
+	0x00, 0x02, 0x00, 0x90, 0x00, 0x00, 0x00, 0x2B, 0xFF, 0x2B, 0xFF, 0x2B,
+	    0xED, 0x00, 0x00, 0x2B,
+	0xFB, 0x00, 0x00, 0x2B, 0xC5, 0x00, 0x00, 0x2B, 0x05, 0x80, 0x70, 0x00,
+	    0x00, 0x00, 0x00, 0x00,
+	0x00, 0x24, 0xD3, 0x2E, 0xC0, 0x2C, 0x3B, 0x08, 0xF0, 0x3B, 0x09, 0x24,
+	    0xBB, 0x3B, 0x0B, 0x24,
+	0xAA, 0x3B, 0x1F, 0xF8, 0x00, 0x3B, 0x3F, 0xF0, 0x00, 0x3B, 0x35, 0xC0,
+	    0x00, 0x38, 0x80, 0x2C,
+	0x00, 0x70, 0x00, 0x00, 0x00, 0x00, 0xC0, 0x38, 0x80, 0x2C, 0x70, 0x00,
+	    0x00, 0x00, 0x00, 0xC0,
+	0x3A, 0x80, 0x2C, 0x70, 0x00, 0x00, 0x00, 0x00, 0xC0, 0x3B, 0x0A, 0x80,
+	    0x2E, 0x83, 0x24, 0xDB,
+	0x00, 0x70, 0x00, 0x00, 0x00, 0x00, 0xC3, 0x2C, 0x31, 0x83, 0x2C, 0x70,
+	    0x00, 0x00, 0x00, 0x00,
+	0xCB, 0x33, 0x1B, 0x83, 0x2C, 0x70, 0x00, 0x00, 0x00, 0x00, 0xCB, 0x31,
+	    0x83, 0x2C, 0x70, 0x00,
+	0x00, 0x00, 0x00, 0xCB, 0x00, 0x33, 0x1E, 0x83, 0x2E, 0x25, 0xFF, 0xC4,
+	    0x00, 0x2F, 0x06, 0x84,
+	0x2E, 0x00, 0x00, 0x10, 0x20, 0x29, 0x00, 0x04, 0x00, 0x10, 0x00, 0x00,
+	    0x00, 0x23, 0x00, 0x00,
+	0x00, 0x21, 0x00, 0x10, 0x00, 0x48, 0x03, 0x00, 0x30, 0xFF, 0xF0, 0xFF,
+	    0xFF, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x04, 0x00, 0x00, 0x21, 0x00, 0x10, 0x00, 0x4C, 0x03, 0x00,
+	    0x30, 0xFF, 0xF0, 0xFF,
+	0xFF, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0C, 0x00, 0x00, 0x21, 0x00, 0x10,
+	    0x00, 0x20, 0x03, 0x00,
+	0x30, 0x7F, 0x00, 0xFC, 0xFF, 0x00, 0x00, 0x00, 0x00, 0x80, 0x10, 0x00,
+	    0x00, 0x20, 0x00, 0x08,
+	0x00, 0x24, 0x03, 0x00, 0x30, 0x08, 0x00, 0x00, 0x00, 0x20, 0x00, 0x08,
+	    0x00, 0x1C, 0x07, 0x00,
+	0x30, 0x1A, 0x00, 0x00, 0x00, 0x21, 0x00, 0x10, 0x00, 0x20, 0x03, 0x00,
+	    0x30, 0xC3, 0xFF, 0xFF,
+	0xFF, 0x00, 0x00, 0x00, 0x00, 0x14, 0x00, 0x00, 0x00, 0x20, 0x00, 0x08,
+	    0x00, 0x80, 0x03, 0x00,
+	0x30, 0x02, 0x00, 0x00, 0x00, 0x24, 0x00, 0x84, 0x00, 0x31, 0x65, 0x77,
+	    0x77, 0x77, 0x78, 0x88,
+	0x77, 0x77, 0x76, 0x77, 0x77, 0x77, 0x77, 0x77, 0x77, 0x78, 0x77, 0x67,
+	    0x66, 0x66, 0x66, 0x66,
+	0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x76, 0x67, 0x66, 0x66, 0x66, 0x66,
+	    0x66, 0x77, 0x66, 0x66,
+	0x66, 0x66, 0x67, 0x66, 0x66, 0x66, 0x66, 0x66, 0x76, 0x76, 0x66, 0x56,
+	    0x66, 0x66, 0x56, 0x55,
+	0x65, 0x66, 0x66, 0x66, 0x65, 0x66, 0x66, 0x55, 0x66, 0x66, 0x65, 0x66,
+	    0x76, 0x76, 0x77, 0x77,
+	0x66, 0x66, 0x66, 0x76, 0x67, 0x66, 0x77, 0x67, 0x66, 0x66, 0x66, 0x56,
+	    0x65, 0x66, 0x65, 0x66,
+	0x66, 0x55, 0x55, 0x54, 0x55, 0x65, 0x66, 0x66, 0x66, 0x76, 0x77, 0x87,
+	    0x88, 0x77, 0x66, 0x66,
+	0x66, 0x66, 0x66, 0x66, 0x66, 0x65, 0x66, 0x55, 0x55, 0x65, 0x56, 0x55,
+	    0x55, 0x55, 0x54, 0x45,
+	0x54, 0x55, 0x55, 0x55, 0x66, 0x66, 0x66, 0x66, 0x66, 0x77, 0x77, 0x77,
+	    0x66, 0x26, 0x00, 0x28,
+	0x00, 0xFF, 0x00, 0x0F, 0x00, 0xF0, 0xF0, 0x0F, 0x00, 0x20, 0x00, 0x00,
+	    0x00, 0x30, 0x01, 0x02,
+	0x00, 0x2C, 0x01, 0x28, 0x00, 0x20, 0x80, 0x00, 0x00, 0x0A, 0x00, 0x02,
+	    0x00, 0x0B, 0x00, 0x19,
+	0x00, 0x40, 0x1F, 0x10, 0x27, 0x00, 0x0F, 0x03, 0x00,
+};
+
+/* Known interrupts */
+
+static unsigned char empty_interrupt[] = {
+	0x00, 0x00, 0x00, 0x00, 0x00,
+};
+
+static unsigned char interrupt1[] = {
+	0x02, 0x00, 0x0E, 0x00, 0xF0,
+};
+
+static unsigned char interrupt2[] = {
+	0x02, 0x04, 0x0A, 0x00, 0xF0,
+};
+
+static unsigned char interrupt3[] = {
+	0x02, 0x00, 0x0A, 0x00, 0xF0,
+};
diff --git a/libfprint/fp_internal.h b/libfprint/fp_internal.h
index f640f58..fe3bfec 100644
--- a/libfprint/fp_internal.h
+++ b/libfprint/fp_internal.h
@@ -305,6 +305,9 @@ extern struct fp_img_driver upektc_img_driver;
 #ifdef ENABLE_ETES603
 extern struct fp_img_driver etes603_driver;
 #endif
+#ifdef ENABLE_VFS0050
+extern struct fp_img_driver vfs0050_driver;
+#endif
 
 extern libusb_context *fpi_usb_ctx;
 extern GSList *opened_devices;
@@ -402,6 +405,7 @@ int fpi_img_compare_print_data(struct fp_print_data *enrolled_print,
 int fpi_img_compare_print_data_to_gallery(struct fp_print_data *print,
 	struct fp_print_data **gallery, int match_threshold, size_t *match_offset);
 struct fp_img *fpi_im_resize(struct fp_img *img, unsigned int w_factor, unsigned int h_factor);
+void fpi_im_downscale(struct fp_img *img, double w_factor, double h_factor);
 
 /* polling and timeouts */
 
diff --git a/libfprint/fprint-list-udev-rules.c b/libfprint/fprint-list-udev-rules.c
index 4b18f5a..7af8d54 100644
--- a/libfprint/fprint-list-udev-rules.c
+++ b/libfprint/fprint-list-udev-rules.c
@@ -74,7 +74,8 @@ static void print_driver (struct fp_driver *driver)
 	if (num_printed == 0)
 	    printf ("# %s\n", driver->full_name);
 
-	printf ("SUBSYSTEM==\"usb\", ATTRS{idVendor}==\"%04x\", ATTRS{idProduct}==\"%04x\", ATTRS{dev}==\"*\", TEST==\"power/control\", ATTR{power/control}=\"auto\"\n", driver->id_table[i].vendor, driver->id_table[i].product);
+	printf ("SUBSYSTEM==\"usb\", ATTRS{idVendor}==\"%04x\", ATTRS{idProduct}==\"%04x\", ATTRS{dev}==\"*\", TEST==\"power/control\", ATTR{power/control}=\"auto\"\n, MODE=\"0666\"\n", driver->id_table[i].vendor, driver->id_table[i].product);
+	printf ("SUBSYSTEM==\"usb\", ATTRS{idVendor}==\"%04x\", ATTRS{idProduct}==\"%04x\", ENV{LIBFPRINT_DRIVER}=\"%s\"\n", driver->id_table[i].vendor, driver->id_table[i].product, driver->full_name);
 	num_printed++;
     }
 
diff --git a/libfprint/imgdev.c b/libfprint/imgdev.c
index 3b5d3f3..7fc687a 100644
--- a/libfprint/imgdev.c
+++ b/libfprint/imgdev.c
@@ -165,6 +165,15 @@ void fpi_imgdev_report_finger_status(struct fp_img_dev *imgdev,
 	case IMG_ACTION_VERIFY:
 		fpi_drvcb_report_verify_result(imgdev->dev, r, img);
 		fp_print_data_free(data);
+
+		/* the callback can cancel verifying, so recheck current
+		 * action and the status to see if retry is needed */
+		if (imgdev->action == IMG_ACTION_VERIFY &&
+		    r > 0 && r != FP_VERIFY_MATCH && r != FP_VERIFY_NO_MATCH) {
+			imgdev->action_result = 0;
+			imgdev->action_state = IMG_ACQUIRE_STATE_AWAIT_FINGER_ON;
+			dev_change_state(imgdev, IMGDEV_STATE_AWAIT_FINGER_ON);
+		}
 		break;
 	case IMG_ACTION_IDENTIFY:
 		fpi_drvcb_report_identify_result(imgdev->dev, r,
diff --git a/libfprint/pixman.c b/libfprint/pixman.c
index 1b4ca06..e37abba 100644
--- a/libfprint/pixman.c
+++ b/libfprint/pixman.c
@@ -61,3 +61,38 @@ struct fp_img *fpi_im_resize(struct fp_img *img, unsigned int w_factor, unsigned
 	return newimg;
 }
 
+void fpi_im_downscale(struct fp_img *img, double w_factor, double h_factor)
+{
+	int new_width = img->width * w_factor;
+	int new_height = img->height * h_factor;
+
+	pixman_image_t *orig, *resized;
+	pixman_transform_t transform;
+
+	orig = pixman_image_create_bits(PIXMAN_a8, img->width, img->height, (uint32_t *)img->data, img->width);
+	resized = pixman_image_create_bits(PIXMAN_a8, new_width, new_height, NULL, new_width);
+
+	pixman_transform_init_identity(&transform);
+	pixman_transform_scale(NULL, &transform, pixman_double_to_fixed(w_factor), pixman_double_to_fixed(h_factor));
+	pixman_image_set_transform(orig, &transform);
+	pixman_image_set_filter(orig, PIXMAN_FILTER_BEST, NULL, 0);
+	pixman_image_composite32(PIXMAN_OP_SRC,
+		orig, /* src */
+		NULL, /* mask */
+		resized, /* dst */
+		0, 0, /* src x y */
+		0, 0, /* mask x y */
+		0, 0, /* dst x y */
+		new_width, new_height /* width height */
+		);
+
+    fpi_img_resize(img, new_width * new_height);
+	img->width = new_width;
+	img->height = new_height;
+
+	memcpy(img->data, pixman_image_get_data(resized), new_width * new_height);
+
+	pixman_image_unref(orig);
+	pixman_image_unref(resized);
+}
+