examples: Add delete command support to virtmissensor.py

When deleting prints, the API user should also delete the print from the
storage (for devices that support on-device storage). Add an example to
show how to do this.

examples/delete.c

@@ -0,0 +1,115 @@
+/*
+ * Example fingerprint delete finger program, which delete the right index
+ * finger which has been previously enrolled to disk.
+ * Copyright (C) 2019 Synaptics Inc
+ *
+ * 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
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#include <libfprint/fprint.h>
+
+struct fp_dscv_dev *discover_device(struct fp_dscv_dev **discovered_devs)
+{
+	struct fp_dscv_dev *ddev = discovered_devs[0];
+	struct fp_driver *drv;
+	if (!ddev)
+		return NULL;
+
+	drv = fp_dscv_dev_get_driver(ddev);
+	printf("Found device claimed by %s driver\n", fp_driver_get_full_name(drv));
+	return ddev;
+}
+
+
+int main(void)
+{
+	int r = 1;
+	struct fp_dscv_dev *ddev;
+	struct fp_dscv_dev **discovered_devs;
+	struct fp_dev *dev;
+	struct fp_print_data *data;
+
+	setenv ("G_MESSAGES_DEBUG", "all", 0);
+	setenv ("LIBUSB_DEBUG", "3", 0);
+
+	r = fp_init();
+	if (r < 0) {
+		fprintf(stderr, "Failed to initialize libfprint\n");
+		exit(1);
+	}
+
+	discovered_devs = fp_discover_devs();
+	if (!discovered_devs) {
+		fprintf(stderr, "Could not discover devices\n");
+		goto out;
+	}
+
+	ddev = discover_device(discovered_devs);
+	if (!ddev) {
+		fprintf(stderr, "No devices detected.\n");
+		goto out;
+	}
+
+	dev = fp_dev_open(ddev);
+	fp_dscv_devs_free(discovered_devs);
+	if (!dev) {
+		fprintf(stderr, "Could not open device.\n");
+		goto out;
+	}
+
+	printf("Opened device. Loading previously enrolled right index finger "
+		"data...\n");
+
+	r = fp_print_data_load(dev, RIGHT_INDEX, &data);
+	if (r != 0) {
+		fprintf(stderr, "Failed to load fingerprint, error %d\n", r);
+		fprintf(stderr, "Did you remember to enroll your right index finger "
+			"first?\n");
+		goto out_close;
+	}
+
+	printf("Print loaded. delete data in sensor.\n");
+	if(!fp_dev_supports_data_in_sensor(dev))
+	{
+		printf("This driver doesn't support to store data in sensor.\n");
+		goto out_close;
+	}
+
+	r = fp_delete_finger(dev, data);
+	fp_print_data_free(data);
+	if (r) {
+		printf("delete finger failed with error %d :(\n", r);
+	}
+	else
+	{
+		printf("sensor data deleted. now delete host data");
+		r = fp_print_data_delete(dev, RIGHT_INDEX);
+		if (r < 0) {
+			printf("Delete sensor data successfully but delete host data failed. %d :(\n", r);
+		}
+	}
+
+out_close:
+	fp_dev_close(dev);
+out:
+	fp_exit();
+	return r;
+}
+
+

examples/meson.build

@@ -1,5 +1,5 @@
 
-examples = [ 'verify_live', 'enroll', 'verify', 'img_capture' ]
+examples = [ 'verify_live', 'enroll', 'verify', 'img_capture', 'delete' ]
 foreach example: examples
     executable(example,
                example + '.c',

examples/prints/README

@@ -0,0 +1,3 @@
+These are example images from NIST and are not copyrighted.
+
+The PNG files have been generated by using the greyscale data as a mask.

examples/sendvirtimg.py

@@ -0,0 +1,86 @@
+#!/usr/bin/env python3
+
+# This script can be used together with the virtual_imgdev to simulate an
+# image based fingerprint reader.
+#
+# To use, set the FP_VIRTUAL_IMGDEV environment variable for both the
+# libfprint using program (e.g. fprintd) and this script.
+#
+# Usually this would work by adding it into the systemd unit file. The
+# best way of doing so is to create
+#  /etc/systemd/system/fprintd.service.d/fprintd-test.conf
+#
+# [Service]
+# RuntimeDirectory=fprint
+# Environment=FP_VIRTUAL_IMGDEV=/run/fprint/virtimg_sock
+# Environment=G_MESSAGES_DEBUG=all
+# ReadWritePaths=$RUNTIME_DIR
+#
+# After that run:
+#
+#   systemctl daemon-reload
+#   systemctl restart fprintd.service
+#
+# You may also need to disable selinux.
+#
+# Then run this script with e.g.
+# FP_VIRTUAL_IMGDEV=/run/fprint/virtimg_sock ./sendvirtimg.py prints/whorl.png
+
+
+
+import cairo
+import sys
+import os
+import socket
+import struct
+
+if len(sys.argv) == 2:
+    png = cairo.ImageSurface.create_from_png(sys.argv[1])
+
+    # Cairo wants 4 byte aligned rows, so just add a few pixel if necessary
+    w = png.get_width()
+    h = png.get_height()
+    w = (w + 3) // 4 * 4
+    h = (h + 3) // 4 * 4
+    img = cairo.ImageSurface(cairo.Format.A8, w, h)
+    cr = cairo.Context(img)
+
+    cr.set_source_rgba(1, 1, 1, 1)
+    cr.paint()
+
+    cr.set_source_rgba(0, 0, 0, 0)
+    cr.set_operator(cairo.OPERATOR_SOURCE)
+
+    cr.set_source_surface(png)
+    cr.paint()
+else:
+    sys.stderr.write('You need to pass a PNG with an alpha channel!\n')
+    sys.exit(1)
+
+def write_dbg_img():
+    dbg_img_rgb = cairo.ImageSurface(cairo.Format.RGB24, img.get_width(), img.get_height())
+    dbg_cr = cairo.Context(dbg_img_rgb)
+    dbg_cr.set_source_rgb(0, 0, 0)
+    dbg_cr.paint()
+    dbg_cr.set_source_rgb(1, 1, 1)
+    dbg_cr.mask_surface(img, 0, 0)
+
+    dbg_img_rgb.write_to_png('/tmp/test.png')
+
+#write_dbg_img()
+
+# Send image through socket
+sockaddr = os.environ['FP_VIRTUAL_IMGDEV']
+
+sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
+sock.connect(sockaddr)
+
+mem = img.get_data()
+mem = mem.tobytes()
+assert len(mem) == img.get_width() * img.get_height()
+
+encoded_img = struct.pack('ii', img.get_width(), img.get_height())
+encoded_img += mem
+
+sock.sendall(encoded_img)
+

examples/virtmissensor.py

@@ -0,0 +1,148 @@
+#!/usr/bin/env python3
+
+# This script can be used together with the virtual_misdev to simulate an
+# match-in-sensor device with internal storage.
+#
+# To use, set the FP_VIRTUAL_MISDEV environment variable for both the
+# libfprint using program (e.g. fprintd) and this script.
+#
+# Usually this would work by adding it into the systemd unit file. The
+# best way of doing so is to create
+#  /etc/systemd/system/fprintd.service.d/fprintd-test.conf
+#
+# [Service]
+# RuntimeDirectory=fprint
+# Environment=FP_VIRTUAL_IMGDEV=/run/fprint/virtimg_sock
+# Environment=G_MESSAGES_DEBUG=all
+# ReadWritePaths=$RUNTIME_DIR
+#
+# After that run:
+#
+#   systemctl daemon-reload
+#   systemctl restart fprintd.service
+#
+# You may also need to disable selinux.
+#
+# Then run this script with e.g.
+# FP_VIRTUAL_IMGDEV=/run/fprint/virtimg_sock ./virtmissensor.py /tmp/storage
+#
+# Please note that the storage file should be pre-created with a few lines
+# Each line represents a slot, if a print is stored, then it will contain a
+# UUID (defined by the driver) and a matching string to identify it again.
+# Note that the last slot line should not end with a \n
+
+import sys
+import os
+import socket
+import struct
+
+import argparse
+
+parser = argparse.ArgumentParser(description='Play virtual fingerprint device with internal storage.')
+parser.add_argument('storage', metavar='storage', type=argparse.FileType('r+'),
+                    help='The "storage" database (one line per slot)')
+parser.add_argument('-e', dest='enroll', type=str,
+                    help='Enroll a print using the string as identifier')
+parser.add_argument('-v', dest='verify', type=str,
+                    help='Verify print if the stored identifier matches the given identifier')
+parser.add_argument('-d', dest='delete', action='store_const', const=True,
+                    help='Delete print as requested by driver')
+
+args = parser.parse_args()
+
+cnt = 0
+if args.enroll:
+    cnt += 1
+if args.verify:
+    cnt += 1
+if args.delete:
+    cnt += 1
+
+assert cnt == 1, 'You need to give exactly one command argument, -e or -v'
+
+prints = []
+for slot in args.storage.read().split('\n'):
+    split = slot.split(' ', 1)
+    if len(split) == 2:
+        prints.append(split)
+    else:
+        prints.append(None)
+
+
+# Send image through socket
+sockaddr = os.environ['FP_VIRTUAL_MISDEV']
+
+sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
+sock.connect(sockaddr)
+
+# Assume we get a full message
+msg = sock.recv(1024)
+assert(msg[-1] == ord(b'\n'))
+
+if args.enroll:
+    if not msg.startswith(b'ENROLL '):
+        sys.stderr.write('Expected to enroll, but driver is not ready for enrolling (%s)\n' % str(msg.split(b' ', 1)[0]))
+        sys.exit(1)
+    uuid = msg[7:-1].decode('utf-8')
+
+    for slot in prints:
+        if slot is not None and slot[0] == uuid:
+            sock.sendall(b'2\n') # ENROLL_FAIL
+            sys.stderr.write('Failed to enroll; UUID has already been stored!\n')
+            sys.exit(1)
+
+    # Find an empty slot
+    for i, slot in enumerate(prints):
+        if slot is not None:
+            continue
+
+        prints[i] = (uuid, args.enroll)
+        sock.sendall(b'1\n') # ENROLL_COMPLETE
+        break
+    else:
+        # TODO: 2: ENROLL_FAIL, but we should send no empty slot!
+        sock.sendall(b'2\n') # ENROLL_FAIL
+        sys.stderr.write('Failed to enroll, no free slots!\n')
+        sys.exit(1)
+
+elif args.verify:
+    if not msg.startswith(b'VERIFY '):
+        sys.stderr.write('Expected to verify, but driver is not ready for verifying (%s)\n' % str(msg.split(b' ', 1)[0]))
+        sys.exit(1)
+    uuid = msg[7:-1].decode('utf-8')
+
+    for slot in prints:
+        if slot is not None and slot[0] == uuid:
+            if slot[1] == args.verify:
+                sock.sendall(b'1\n') # VERIFY_MATCH
+            else:
+                sock.sendall(b'0\n') # VERIFY_NO_MATCH
+            sys.exit(0)
+    else:
+        sys.stderr.write('Slot ID is unknown, returning error\n')
+        sock.sendall(b'-1') # error, need way to report that print is unkown
+
+elif args.delete:
+    if not msg.startswith(b'DELETE '):
+        sys.stderr.write('Expected to delete, but driver is not ready for deleting (%s)\n' % str(msg.split(b' ', 1)[0]))
+        sys.exit(1)
+    uuid = msg[7:-1].decode('utf-8')
+
+    for i, slot in enumerate(prints):
+        if slot is not None and slot[0] == uuid:
+            if slot[0] == uuid:
+                prints[i] = None
+                sock.sendall(b'0\n') # DELETE_COMPLETE
+                break
+    else:
+        sys.stderr.write('Slot ID is unknown, just report back complete\n')
+        sock.sendall(b'0') # DELETE_COMPLETE
+
+prints_str = '\n'.join('' if p is None else '%s %s' % (p[0], p[1]) for p in prints)
+prints_human_str = '\n'.join('empty slot' if p is None else '%s %s' % (p[0], p[1]) for p in prints)
+
+print('Prints stored now:')
+print(prints_human_str)
+args.storage.seek(0)
+args.storage.truncate()
+args.storage.write(prints_str)

libfprint/drivers/aes1610.c

@@ -820,7 +820,8 @@ struct fp_img_driver aes1610_driver = {
 		.id = AES1610_ID,
 		.name = FP_COMPONENT,
 		.full_name = "AuthenTec AES1610",
-		.id_table = id_table,
+		.bus = BUS_TYPE_USB,
+		.id_table.usb = id_table,
 		.scan_type = FP_SCAN_TYPE_SWIPE,
 	},
 	.flags = 0,

libfprint/drivers/aes1660.c

@@ -97,7 +97,8 @@ struct fp_img_driver aes1660_driver = {
 		.id = AES1660_ID,
 		.name = FP_COMPONENT,
 		.full_name = "AuthenTec AES1660",
-		.id_table = id_table,
+		.bus = BUS_TYPE_USB,
+		.id_table.usb = id_table,
 		.scan_type = FP_SCAN_TYPE_SWIPE,
 	},
 	.flags = 0,

libfprint/drivers/aes2501.c

@@ -862,7 +862,8 @@ struct fp_img_driver aes2501_driver = {
 		.id = AES2501_ID,
 		.name = FP_COMPONENT,
 		.full_name = "AuthenTec AES2501",
-		.id_table = id_table,
+		.bus = BUS_TYPE_USB,
+		.id_table.usb = id_table,
 		.scan_type = FP_SCAN_TYPE_SWIPE,
 	},
 	.flags = 0,

libfprint/drivers/aes2550.c

@@ -606,7 +606,8 @@ struct fp_img_driver aes2550_driver = {
 		.id = AES2550_ID,
 		.name = FP_COMPONENT,
 		.full_name = "AuthenTec AES2550/AES2810",
-		.id_table = id_table,
+		.bus = BUS_TYPE_USB,
+		.id_table.usb = id_table,
 		.scan_type = FP_SCAN_TYPE_SWIPE,
 	},
 	.flags = 0,

libfprint/drivers/aes2660.c

@@ -100,7 +100,8 @@ struct fp_img_driver aes2660_driver = {
 		.id = AES2660_ID,
 		.name = FP_COMPONENT,
 		.full_name = "AuthenTec AES2660",
-		.id_table = id_table,
+		.bus = BUS_TYPE_USB,
+		.id_table.usb = id_table,
 		.scan_type = FP_SCAN_TYPE_SWIPE,
 	},
 	.flags = 0,

libfprint/drivers/aes3500.c

@@ -165,7 +165,8 @@ struct fp_img_driver aes3500_driver = {
 		.id = AES3500_ID,
 		.name = FP_COMPONENT,
 		.full_name = "AuthenTec AES3500",
-		.id_table = id_table,
+		.bus = BUS_TYPE_USB,
+		.id_table.usb = id_table,
 		.scan_type = FP_SCAN_TYPE_PRESS,
 	},
 	.flags = 0,

libfprint/drivers/aes4000.c

@@ -162,7 +162,8 @@ struct fp_img_driver aes4000_driver = {
 		.id = AES4000_ID,
 		.name = FP_COMPONENT,
 		.full_name = "AuthenTec AES4000",
-		.id_table = id_table,
+		.bus = BUS_TYPE_USB,
+		.id_table.usb = id_table,
 		.scan_type = FP_SCAN_TYPE_PRESS,
 	},
 	.flags = 0,

libfprint/drivers/aeslib.c

@@ -82,7 +82,7 @@ static int do_write_regv(struct write_regv_data *wdata, int upper_bound)
 		data[data_offset++] = regwrite->value;
 	}
 
-	libusb_fill_bulk_transfer(transfer, FP_DEV(wdata->imgdev)->udev, EP_OUT, data,
+	libusb_fill_bulk_transfer(transfer, fpi_dev_get_usb_dev (FP_DEV(wdata->imgdev)), EP_OUT, data,
 		alloc_size, write_regv_trf_complete, wdata, BULK_TIMEOUT);
 	r = libusb_submit_transfer(transfer);
 	if (r < 0) {

libfprint/drivers/driver_ids.h

@@ -42,6 +42,8 @@ enum {
 	VFS5011_ID	= 19,
 	VFS0050_ID	= 20,
 	ELAN_ID		= 21,
+	VIRTUAL_IMG_ID	= 22,
+	VIRTUAL_MIS_ID	= 23,
 };
 
 #endif

libfprint/drivers/elan.c

@@ -973,7 +973,8 @@ struct fp_img_driver elan_driver = {
 		   .id = ELAN_ID,
 		   .name = FP_COMPONENT,
 		   .full_name = "ElanTech Fingerprint Sensor",
-		   .id_table = elan_id_table,
+		   .bus = BUS_TYPE_USB,
+		   .id_table.usb = elan_id_table,
 		   .scan_type = FP_SCAN_TYPE_SWIPE,
 		   },
 	.flags = 0,

libfprint/drivers/etes603.c

@@ -1481,7 +1481,8 @@ struct fp_img_driver etes603_driver = {
 		.id = ETES603_ID,
 		.name = FP_COMPONENT,
 		.full_name = "EgisTec ES603",
-		.id_table = id_table,
+		.bus = BUS_TYPE_USB,
+		.id_table.usb = id_table,
 		.scan_type = FP_SCAN_TYPE_SWIPE,
 	},
 	.flags = 0,

libfprint/drivers/fdu2000.c

@@ -305,7 +305,8 @@ struct fp_img_driver fdu2000_driver = {
 		.id = FDU2000_ID,
 		.name = FP_COMPONENT,
 		.full_name = "Secugen FDU 2000",
-		.id_table = id_table,
+		.bus = BUS_TYPE_USB,
+		.id_table.usb = id_table,
 		.scan_type = FP_SCAN_TYPE_PRESS,
 	},
 	.img_height = RAW_IMAGE_HEIGTH,

libfprint/drivers/upeksonly.c

@@ -1348,9 +1348,10 @@ struct fp_img_driver upeksonly_driver = {
 		.id = UPEKSONLY_ID,
 		.name = FP_COMPONENT,
 		.full_name = "UPEK TouchStrip Sensor-Only",
-		.id_table = id_table,
+		.bus = BUS_TYPE_USB,
+		.id_table.usb = id_table,
 		.scan_type = FP_SCAN_TYPE_SWIPE,
-		.discover = dev_discover,
+		.usb_discover = dev_discover,
 	},
 	.flags = 0,
 	.img_width = -1,

libfprint/drivers/upektc.c

@@ -463,7 +463,8 @@ struct fp_img_driver upektc_driver = {
 		.id = UPEKTC_ID,
 		.name = FP_COMPONENT,
 		.full_name = "UPEK TouchChip/Eikon Touch 300",
-		.id_table = id_table,
+		.bus = BUS_TYPE_USB,
+		.id_table.usb = id_table,
 		.scan_type = FP_SCAN_TYPE_PRESS,
 	},
 	.flags = 0,

libfprint/drivers/upektc_img.c

@@ -631,9 +631,10 @@ struct fp_img_driver upektc_img_driver = {
 		.id = UPEKTC_IMG_ID,
 		.name = FP_COMPONENT,
 		.full_name = "Upek TouchChip Fingerprint Coprocessor",
-		.id_table = id_table,
+		.bus = BUS_TYPE_USB,
+		.id_table.usb = id_table,
 		.scan_type = FP_SCAN_TYPE_SWIPE,
-		.discover = discover,
+		.usb_discover = discover,
 	},
 	.flags = 0,
 	.img_height = IMAGE_HEIGHT,

libfprint/drivers/upekts.c

@@ -1424,7 +1424,8 @@ struct fp_driver upekts_driver = {
 	.id = UPEKTS_ID,
 	.name = FP_COMPONENT,
 	.full_name = "UPEK TouchStrip",
-	.id_table = id_table,
+	.bus = BUS_TYPE_USB,
+	.id_table.usb = id_table,
 	.scan_type = FP_SCAN_TYPE_SWIPE,
 	.open = dev_init,
 	.close = dev_exit,

libfprint/drivers/uru4000.c

@@ -1431,7 +1431,8 @@ struct fp_img_driver uru4000_driver = {
 		.id = URU4000_ID,
 		.name = FP_COMPONENT,
 		.full_name = "Digital Persona U.are.U 4000/4000B/4500",
-		.id_table = id_table,
+		.bus = BUS_TYPE_USB,
+		.id_table.usb = id_table,
 		.scan_type = FP_SCAN_TYPE_PRESS,
 	},
 	.flags = FP_IMGDRV_SUPPORTS_UNCONDITIONAL_CAPTURE,

libfprint/drivers/vcom5s.c

@@ -360,7 +360,8 @@ struct fp_img_driver vcom5s_driver = {
 		.id = VCOM5S_ID,
 		.name = FP_COMPONENT,
 		.full_name = "Veridicom 5thSense",
-		.id_table = id_table,
+		.bus = BUS_TYPE_USB,
+		.id_table.usb = id_table,
 		.scan_type = FP_SCAN_TYPE_PRESS,
 	},
 	.flags = 0,

libfprint/drivers/vfs0050.c

@@ -773,7 +773,8 @@ struct fp_img_driver vfs0050_driver = {
 		   .id = VFS0050_ID,
 		   .name = FP_COMPONENT,
 		   .full_name = "Validity VFS0050",
-		   .id_table = id_table,
+		   .bus = BUS_TYPE_USB,
+		   .id_table.usb = id_table,
 		   .scan_type = FP_SCAN_TYPE_SWIPE,
 		   },
 

libfprint/drivers/vfs101.c

@@ -1529,7 +1529,8 @@ struct fp_img_driver vfs101_driver =
 		.id = VFS101_ID,
 		.name = FP_COMPONENT,
 		.full_name = "Validity VFS101",
-		.id_table = id_table,
+		.bus = BUS_TYPE_USB,
+		.id_table.usb = id_table,
 		.scan_type = FP_SCAN_TYPE_SWIPE,
 	},
 

libfprint/drivers/vfs301.c

@@ -271,7 +271,8 @@ struct fp_img_driver vfs301_driver =
 		.id = VFS301_ID,
 		.name = FP_COMPONENT,
 		.full_name = "Validity VFS301",
-		.id_table = id_table,
+		.bus = BUS_TYPE_USB,
+		.id_table.usb = id_table,
 		.scan_type = FP_SCAN_TYPE_SWIPE,
 	},
 

libfprint/drivers/vfs5011.c

@@ -890,7 +890,8 @@ struct fp_img_driver vfs5011_driver = {
 		.id = VFS5011_ID,
 		.name = "vfs5011",
 		.full_name = "Validity VFS5011",
-		.id_table = id_table,
+		.bus = BUS_TYPE_USB,
+		.id_table.usb = id_table,
 		.scan_type = FP_SCAN_TYPE_SWIPE,
 	},
 

libfprint/drivers/virtual_imgdev.c

@@ -0,0 +1,225 @@
+/*
+ * Virtual driver for image device debugging
+ *
+ * Copyright (C) 2019 Benjamin Berg <bberg@redhat.com>
+ *
+ * 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
+ */
+
+/*
+ * This is a virtual driver to debug the image based drivers. A small
+ * python script is provided to connect to it via a socket, allowing
+ * prints to be sent to this device programatically.
+ * Using this it is possible to test libfprint and fprintd.
+ */
+
+#define FP_COMPONENT "virtual_imgdev"
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include "drivers_api.h"
+
+struct virt_dev {
+	fpi_io_condition *socket_io_cond;
+	fpi_io_condition *client_io_cond;
+
+	gint socket_fd;
+	gint client_fd;
+
+	struct fp_img *recv_img;
+	gssize recv_img_data_bytes;
+	gssize recv_img_hdr_bytes;
+	gint recv_img_hdr[2];
+};
+
+static void
+client_socket_cb  (struct fp_dev *dev, int fd, short int events, void *data)
+{
+	struct virt_dev *virt = FP_INSTANCE_DATA(dev);
+	gboolean nodata = FALSE;
+	gssize len;
+
+	if (!virt->recv_img) {
+		/* Reading the header, i.e. width/height. */
+		len = read(fd,
+			   (guint8*)virt->recv_img_hdr + virt->recv_img_hdr_bytes,
+			   sizeof(virt->recv_img_hdr) - virt->recv_img_hdr_bytes);
+		fp_dbg("Received %zi bytes from client!", len);
+
+		if (len > 0) {
+			virt->recv_img_hdr_bytes += len;
+			/* Got the full header, create an image for further processing. */
+			if (virt->recv_img_hdr_bytes == sizeof(virt->recv_img_hdr)) {
+				virt->recv_img_data_bytes = 0;
+				virt->recv_img = fpi_img_new (virt->recv_img_hdr[0] * virt->recv_img_hdr[1]);
+				virt->recv_img->width = virt->recv_img_hdr[0];
+				virt->recv_img->height = virt->recv_img_hdr[1];
+				virt->recv_img->flags = 0;
+			}
+		}
+	} else {
+		len = read(fd,
+			   (guint8*)virt->recv_img->data + virt->recv_img_data_bytes,
+			   virt->recv_img->length - virt->recv_img_data_bytes);
+		fp_dbg("Received %zi bytes from client!", len);
+
+		if (len > 0) {
+			virt->recv_img_data_bytes += len;
+			if (virt->recv_img_data_bytes == virt->recv_img->length) {
+				/* Submit received image to frontend */
+				fpi_imgdev_report_finger_status (FP_IMG_DEV (dev), TRUE);
+				fpi_imgdev_image_captured(FP_IMG_DEV (dev), virt->recv_img);
+				virt->recv_img = NULL;
+				fpi_imgdev_report_finger_status (FP_IMG_DEV (dev), FALSE);
+			}
+		}
+	}
+
+	if (len <= 0) {
+		fp_dbg("Client disconnected!");
+		close (virt->client_fd);
+		virt->client_fd = -1;
+
+		virt->recv_img_hdr_bytes = 0;
+		if (virt->recv_img)
+			fp_img_free (virt->recv_img);
+		virt->recv_img = NULL;
+
+		fpi_io_condition_remove (virt->client_io_cond);
+		virt->client_io_cond = NULL;
+	}
+}
+
+static void
+new_connection_cb (struct fp_dev *dev, int fd, short int events, void *data)
+{
+	struct virt_dev *virt = FP_INSTANCE_DATA(dev);
+	int new_client_fd;
+
+	new_client_fd = accept4(fd, NULL, NULL, SOCK_NONBLOCK | SOCK_CLOEXEC);
+
+	fp_dbg("Got a new connection!");
+
+	/* Already have a connection, reject this one */
+	if (virt->client_fd >= 0) {
+		fp_warn("Rejecting new connection as we already have one!");
+		close (new_client_fd);
+		return;
+	}
+
+	virt->client_fd = new_client_fd;
+	virt->client_io_cond = fpi_io_condition_add (virt->client_fd, POLL_IN, client_socket_cb, dev, NULL);
+}
+
+static int
+dev_init(struct fp_img_dev *dev, unsigned long driver_data)
+{
+	struct virt_dev *virt;
+	const char *env;
+	struct sockaddr_un addr = {
+		.sun_family = AF_UNIX
+	};
+	G_DEBUG_HERE();
+
+	virt = g_new0(struct virt_dev, 1);
+	fp_dev_set_instance_data(FP_DEV(dev), virt);
+
+	virt->client_fd = -1;
+
+	env = fpi_dev_get_virtual_env (FP_DEV (dev));
+
+	virt->socket_fd = socket(AF_UNIX, SOCK_STREAM | SOCK_NONBLOCK | SOCK_CLOEXEC, 0);
+	if (virt->socket_fd < 0) {
+		fp_err("Could not create socket: %m");
+		return virt->socket_fd;
+	}
+	strncpy (addr.sun_path, env, sizeof(addr.sun_path) - 1);
+
+	unlink(env);
+	if (bind(virt->socket_fd, &addr, sizeof(struct sockaddr_un)) < 0) {
+		fp_err("Could not bind address '%s': %m", addr.sun_path);
+		close (virt->socket_fd);
+		virt->socket_fd = -1;
+		return -1;
+	}
+
+	if (listen (virt->socket_fd, 1) < 0) {
+		fp_err("Could not open socket for listening: %m");
+		close (virt->socket_fd);
+		virt->socket_fd = -1;
+		return -1;
+	}
+
+	virt->socket_io_cond = fpi_io_condition_add (virt->socket_fd, POLL_IN, new_connection_cb, FP_DEV (dev), NULL);
+
+	fpi_imgdev_open_complete(dev, 0);
+	return 0;
+}
+
+static void dev_deinit(struct fp_img_dev *dev)
+{
+	struct virt_dev *virt = FP_INSTANCE_DATA(FP_DEV(dev));
+
+	G_DEBUG_HERE();
+
+	if (virt->client_fd >= 0) {
+		fpi_io_condition_remove (virt->client_io_cond);
+		close (virt->client_fd);
+	}
+
+	if (virt->socket_fd >= 0) {
+		fpi_io_condition_remove (virt->socket_io_cond);
+		close (virt->socket_fd);
+	}
+
+	g_free(virt);
+	fpi_imgdev_close_complete(dev);
+}
+
+static int dev_activate(struct fp_img_dev *dev, enum fp_imgdev_state state)
+{
+	G_DEBUG_HERE();
+
+	fpi_imgdev_activate_complete (dev, 0);
+	return 0;
+}
+
+static void dev_deactivate(struct fp_img_dev *dev)
+{
+	G_DEBUG_HERE();
+
+	fpi_imgdev_deactivate_complete (dev);
+}
+
+struct fp_img_driver virtual_imgdev_driver = {
+	.driver = {
+		   .id = VIRTUAL_IMG_ID,
+		   .name = FP_COMPONENT,
+		   .full_name = "Virtual image device for debugging",
+		   .bus = BUS_TYPE_VIRTUAL,
+		   .id_table.virtual_envvar = "FP_VIRTUAL_IMGDEV",
+		   .scan_type = FP_SCAN_TYPE_PRESS,
+		   },
+	.flags = 0,
+
+	.open = dev_init,
+	.close = dev_deinit,
+	.activate = dev_activate,
+	.deactivate = dev_deactivate,
+};

libfprint/drivers/virtual_misdev.c

@@ -0,0 +1,424 @@
+/*
+ * Virtual match-in-sensor device with internal storage
+ *
+ * Copyright (C) 2019 Benjamin Berg <bberg@redhat.com>
+ *
+ * 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
+ */
+
+/*
+ * This is a virtual driver to debug features that are relevant for
+ * match-in-sensor (MIS) devices that store data on the sensor itself.
+ * In this case data needs to be deleted both locally and from the device
+ * and we should support garbage collection.
+ *
+ * The protocol is line based, when a verify/enroll/etc. command is started
+ * (or is active when connecting) then we send the command and the UUID
+ * terminated by a newline.
+ *
+ *   IDLE\n
+ *   VERIFY UUID\n
+ *   ENROLL UUID\n
+ *   DELETE UUID\n (planned)
+ *   LIST (planned)
+ *
+ * The other end simply responds with an integer (terminated by newline)
+ * that matches the internal fprint return codes.
+ */
+
+#define FP_COMPONENT "virtual_misdev"
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include "drivers_api.h"
+#include "fpi-async.h"
+
+#define VIRT_ENROLL_STAGES 1
+
+enum virtdev_state {
+	STATE_IDLE = 0,
+	STATE_VERIFY,
+	STATE_ENROLL,
+	STATE_DELETE,
+};
+
+struct virt_dev {
+	enum virtdev_state state;
+
+	gchar *curr_uuid;
+
+	fpi_io_condition *socket_io_cond;
+	fpi_io_condition *client_io_cond;
+
+	gint socket_fd;
+	gint client_fd;
+
+	gssize recv_len;
+	guchar *recv_buf;
+};
+
+static void send_status(struct fp_dev *dev);
+
+static void
+handle_response (struct fp_dev *dev, guchar *buf, gssize len)
+{
+	struct virt_dev *virt = FP_INSTANCE_DATA(dev);
+	gint result = atoi ((gchar*) buf);
+
+	switch (virt->state) {
+	case STATE_IDLE:
+		fp_info ("Received unexpected status code %i\n", virt->state);
+		break;
+	case STATE_VERIFY:
+		fp_info ("Reporting verify results back %i\n", result);
+		fpi_drvcb_report_verify_result (dev, result, NULL);
+		break;
+	case STATE_ENROLL: {
+		struct fp_print_data * fdata = NULL;
+
+		fp_info ("Reporting enroll results back %i\n", result);
+
+		/* If the enroll is "done", then report back the UUID for the print. */
+		if (result == FP_ENROLL_COMPLETE) {
+			struct fp_print_data_item *item = NULL;
+
+			fdata = fpi_print_data_new (dev);
+
+			item = fpi_print_data_item_new(strlen(virt->curr_uuid));
+			memcpy(item->data, virt->curr_uuid, strlen(virt->curr_uuid));
+			fpi_print_data_add_item(fdata, item);
+		}
+
+		fpi_drvcb_enroll_stage_completed (dev, result, fdata, NULL);
+		break;
+	}
+	case STATE_DELETE:
+		fp_info ("Reporting delete results back %i\n", result);
+
+		virt->state = STATE_IDLE;
+		g_free (virt->curr_uuid);
+		virt->curr_uuid = NULL;
+
+		fpi_drvcb_delete_complete (dev, result);
+
+		send_status(dev);
+		break;
+	default:
+		g_assert_not_reached();
+	}
+}
+
+static void
+send_status(struct fp_dev *dev)
+{
+	struct virt_dev *virt = FP_INSTANCE_DATA(dev);
+	gchar *msg = NULL;
+
+	if (virt->client_fd < 0)
+		return;
+
+	switch (virt->state) {
+	case STATE_IDLE:
+		msg = g_strdup ("IDLE\n");
+		break;
+	case STATE_ENROLL:
+		msg = g_strdup_printf ("ENROLL %s\n", virt->curr_uuid);
+		break;
+	case STATE_VERIFY:
+		msg = g_strdup_printf ("VERIFY %s\n", virt->curr_uuid);
+		break;
+	case STATE_DELETE:
+		msg = g_strdup_printf ("DELETE %s\n", virt->curr_uuid);
+		break;
+	}
+
+	send(virt->client_fd, msg, strlen(msg), MSG_NOSIGNAL);
+
+	g_free (msg);
+}
+
+static void
+client_socket_cb (struct fp_dev *dev, int fd, short int events, void *data)
+{
+	struct virt_dev *virt = FP_INSTANCE_DATA(dev);
+	guchar *pos;
+	guchar buf[512];
+	gssize len;
+
+	len = read(fd, buf, sizeof(buf));
+	fp_dbg("Received %zi bytes from client!", len);
+
+	if (len > 0) {
+		virt->recv_buf = g_realloc(virt->recv_buf, virt->recv_len + len);
+		memcpy(virt->recv_buf + virt->recv_len, buf, len);
+		virt->recv_len += len;
+
+		while ((pos = memmem(virt->recv_buf, virt->recv_len, "\n", 1))) {
+			/* Found a newline, parse the command */
+			fp_dbg("got a command response! %p %p", virt->recv_buf, pos);
+			*pos = '\0';
+			handle_response(dev, virt->recv_buf, pos - virt->recv_buf);
+
+			/* And remove the parsed part from the buffer */
+			virt->recv_len = virt->recv_len - (pos - virt->recv_buf) - 1;
+			memmove(pos, virt->recv_buf, virt->recv_len);
+			virt->recv_buf = realloc(virt->recv_buf, virt->recv_len);
+		}
+	} else {
+		fp_dbg("Client disconnected!");
+		close (virt->client_fd);
+		virt->client_fd = -1;
+
+		fpi_io_condition_remove (virt->client_io_cond);
+		virt->client_io_cond = NULL;
+
+		g_free(virt->recv_buf);
+		virt->recv_buf = NULL;
+		virt->recv_len = 0;
+	}
+}
+
+static void
+new_connection_cb (struct fp_dev *dev, int fd, short int events, void *data)
+{
+	struct virt_dev *virt = FP_INSTANCE_DATA(dev);
+	int new_client_fd;
+
+	new_client_fd = accept4(fd, NULL, NULL, SOCK_NONBLOCK | SOCK_CLOEXEC);
+
+	fp_dbg("Got a new connection!");
+
+	/* Already have a connection, reject this one */
+	if (virt->client_fd >= 0) {
+		fp_warn("Rejecting new connection as we already have one!");
+		close (new_client_fd);
+		return;
+	}
+
+	virt->client_fd = new_client_fd;
+	virt->client_io_cond = fpi_io_condition_add (virt->client_fd, POLL_IN, client_socket_cb, dev, NULL);
+
+	send_status(dev);
+}
+
+static int
+dev_init(struct fp_dev *dev, unsigned long driver_data)
+{
+	struct virt_dev *virt;
+	const char *env;
+	struct sockaddr_un addr = {
+		.sun_family = AF_UNIX
+	};
+	G_DEBUG_HERE();
+
+	fpi_dev_set_nr_enroll_stages(dev, VIRT_ENROLL_STAGES);
+
+	virt = g_new0(struct virt_dev, 1);
+	fp_dev_set_instance_data(dev, virt);
+
+	virt->client_fd = -1;
+
+	env = fpi_dev_get_virtual_env (dev);
+
+	virt->socket_fd = socket(AF_UNIX, SOCK_STREAM | SOCK_NONBLOCK | SOCK_CLOEXEC, 0);
+	if (virt->socket_fd < 0) {
+		fp_err("Could not create socket: %m");
+		return virt->socket_fd;
+	}
+	strncpy (addr.sun_path, env, sizeof(addr.sun_path) - 1);
+
+	unlink(env);
+	if (bind(virt->socket_fd, &addr, sizeof(struct sockaddr_un)) < 0) {
+		fp_err("Could not bind address '%s': %m", addr.sun_path);
+		close (virt->socket_fd);
+		virt->socket_fd = -1;
+		return -1;
+	}
+
+	if (listen (virt->socket_fd, 1) < 0) {
+		fp_err("Could not open socket for listening: %m");
+		close (virt->socket_fd);
+		virt->socket_fd = -1;
+		return -1;
+	}
+
+	virt->socket_io_cond = fpi_io_condition_add (virt->socket_fd, POLL_IN, new_connection_cb, dev, NULL);
+
+	fpi_drvcb_open_complete(dev, 0);
+	return 0;
+}
+
+static void dev_deinit(struct fp_dev *dev)
+{
+	struct virt_dev *virt = FP_INSTANCE_DATA(dev);
+
+	G_DEBUG_HERE();
+
+	if (virt->client_fd >= 0) {
+		fpi_io_condition_remove (virt->client_io_cond);
+		close (virt->client_fd);
+	}
+
+	if (virt->socket_fd >= 0) {
+		fpi_io_condition_remove (virt->socket_io_cond);
+		close (virt->socket_fd);
+	}
+
+	g_free (virt->curr_uuid);
+	virt->curr_uuid = NULL;
+
+	g_free(virt);
+	fpi_drvcb_close_complete(dev);
+}
+
+static int enroll_start(struct fp_dev *dev)
+{
+	struct virt_dev *virt = FP_INSTANCE_DATA(dev);
+	G_DEBUG_HERE();
+
+	if (virt->state != STATE_IDLE)
+		return -1;
+
+	g_assert (virt->curr_uuid == NULL);
+
+	virt->state = STATE_ENROLL;
+
+	virt->curr_uuid = g_uuid_string_random ();
+	send_status(dev);
+
+	fpi_drvcb_enroll_started(dev, 0);
+	return 0;
+}
+
+static int enroll_stop(struct fp_dev *dev)
+{
+	struct virt_dev *virt = FP_INSTANCE_DATA(dev);
+	G_DEBUG_HERE();
+
+	if (virt->state != STATE_ENROLL)
+		return -1;
+
+	virt->state = STATE_IDLE;
+	g_free (virt->curr_uuid);
+	virt->curr_uuid = NULL;
+	send_status(dev);
+
+	fpi_drvcb_enroll_stopped(dev);
+	return 0;
+}
+
+static int verify_start(struct fp_dev *dev)
+{
+	struct virt_dev *virt = FP_INSTANCE_DATA(dev);
+	struct fp_print_data *print;
+	struct fp_print_data_item *item;
+
+	G_DEBUG_HERE();
+
+	if (virt->state != STATE_IDLE)
+		return -1;
+
+	g_assert (virt->curr_uuid == NULL);
+
+	virt->state = STATE_VERIFY;
+
+	print = fpi_dev_get_verify_data(dev);
+	item = fpi_print_data_get_item(print);
+
+	/* We expecte a UUID, that means 36 bytes. */
+	g_assert(item->length == 36);
+
+	virt->curr_uuid = g_malloc(37);
+	virt->curr_uuid[36] = '\0';
+	memcpy(virt->curr_uuid, item->data, 36);
+
+	g_assert(g_uuid_string_is_valid (virt->curr_uuid));
+
+	send_status(dev);
+
+	fpi_drvcb_verify_started(dev, 0);
+	return 0;
+}
+
+static int verify_stop(struct fp_dev *dev, gboolean iterating)
+{
+	struct virt_dev *virt = FP_INSTANCE_DATA(dev);
+	G_DEBUG_HERE();
+
+	if (virt->state != STATE_VERIFY)
+		return -1;
+
+	virt->state = STATE_IDLE;
+	g_free (virt->curr_uuid);
+	virt->curr_uuid = NULL;
+
+	send_status(dev);
+
+	fpi_drvcb_verify_stopped(dev);
+	return 0;
+}
+
+static int delete_finger(struct fp_dev *dev)
+{
+	struct virt_dev *virt = FP_INSTANCE_DATA(dev);
+	struct fp_print_data *print;
+	struct fp_print_data_item *item;
+
+	G_DEBUG_HERE();
+
+	if (virt->state != STATE_IDLE)
+		return -1;
+
+	g_assert (virt->curr_uuid == NULL);
+
+	virt->state = STATE_DELETE;
+
+	print = fpi_dev_get_delete_data(dev);
+	item = fpi_print_data_get_item(print);
+
+	/* We expecte a UUID, that means 36 bytes. */
+	g_assert(item->length == 36);
+
+	virt->curr_uuid = g_malloc(37);
+	virt->curr_uuid[36] = '\0';
+	memcpy(virt->curr_uuid, item->data, 36);
+
+	g_assert(g_uuid_string_is_valid (virt->curr_uuid));
+
+	send_status(dev);
+
+	return 0;
+}
+
+struct fp_driver virtual_misdev_driver = {
+	.id = VIRTUAL_MIS_ID,
+	.name = FP_COMPONENT,
+	.full_name = "Virtual match-in-sensor device with internal storage",
+	.bus = BUS_TYPE_VIRTUAL,
+	.id_table.virtual_envvar = "FP_VIRTUAL_MISDEV",
+	.scan_type = FP_SCAN_TYPE_PRESS,
+
+	.open = dev_init,
+	.close = dev_deinit,
+	.enroll_start = enroll_start,
+	.enroll_stop = enroll_stop,
+	.verify_start = verify_start,
+	.verify_stop = verify_stop,
+	.delete_finger = delete_finger,
+};

libfprint/fp_internal.h

@@ -77,6 +77,9 @@ enum fp_dev_state {
 	DEV_STATE_CAPTURING,
 	DEV_STATE_CAPTURE_DONE,
 	DEV_STATE_CAPTURE_STOPPING,
+	DEV_STATE_DELETING,
+	DEV_STATE_DELETE_DONE,
+	DEV_STATE_DELETE_STOPPING,
 };
 
 struct fp_dev {
@@ -90,11 +93,16 @@ struct fp_dev {
 
 	int nr_enroll_stages;
 
-	/* FIXME: This will eventually have a bus type */
-	libusb_device_handle *udev;
+	enum fp_bus_type bus;
+	union {
+		libusb_device_handle *usb;
+		const char *virtual_env;
+		int i2c;
+	} device;
 
 	/* read-only to drivers */
 	struct fp_print_data *verify_data;
+	struct fp_print_data *delete_data;
 
 	/* drivers should not mess with any of the below */
 	enum fp_dev_state state;
@@ -123,6 +131,8 @@ struct fp_dev {
 	void *capture_cb_data;
 	fp_operation_stop_cb capture_stop_cb;
 	void *capture_stop_cb_data;
+	fp_delete_cb delete_cb;
+	void *delete_cb_data;
 
 	/* FIXME: better place to put this? */
 	struct fp_print_data **identify_gallery;
@@ -156,7 +166,13 @@ struct fp_img_dev {
 
 /* fp_dscv_dev structure definition */
 struct fp_dscv_dev {
-	struct libusb_device *udev;
+	enum fp_bus_type bus;
+	union {
+		struct libusb_device *usb;
+		const char *virtual_env;
+		char *spi_path;
+	} desc;
+
 	struct fp_driver *drv;
 	unsigned long driver_data;
 	uint32_t devtype;

libfprint/fpi-async.c

@@ -66,7 +66,6 @@ API_EXPORTED int fp_async_dev_open(struct fp_dscv_dev *ddev, fp_dev_open_cb call
 {
 	struct fp_driver *drv;
 	struct fp_dev *dev;
-	libusb_device_handle *udevh;
 	int r;
 
 	g_return_val_if_fail(ddev != NULL, -ENODEV);
@@ -75,20 +74,32 @@ API_EXPORTED int fp_async_dev_open(struct fp_dscv_dev *ddev, fp_dev_open_cb call
 	drv = ddev->drv;
 
 	G_DEBUG_HERE();
-	r = libusb_open(ddev->udev, &udevh);
-	if (r < 0) {
-		fp_err("usb_open failed, error %d", r);
-		return r;
-	}
 
 	dev = g_malloc0(sizeof(*dev));
 	dev->drv = drv;
-	dev->udev = udevh;
+	dev->bus = ddev->bus;
 	dev->__enroll_stage = -1;
 	dev->state = DEV_STATE_INITIALIZING;
 	dev->open_cb = callback;
 	dev->open_cb_data = user_data;
 
+	switch (ddev->bus) {
+	case BUS_TYPE_USB:
+		r = libusb_open(ddev->desc.usb, &dev->device.usb);
+		if (r < 0) {
+			fp_err("usb_open failed, error %d", r);
+			g_free (dev);
+			return r;
+		}
+		break;
+	case BUS_TYPE_SPI:
+		/* TODO: Implement */
+		break;
+	case BUS_TYPE_VIRTUAL:
+		dev->device.virtual_env = ddev->desc.virtual_env;
+		break;
+	}
+
 	if (!drv->open) {
 		fpi_drvcb_open_complete(dev, 0);
 		return 0;
@@ -98,7 +109,14 @@ API_EXPORTED int fp_async_dev_open(struct fp_dscv_dev *ddev, fp_dev_open_cb call
 	r = drv->open(dev, ddev->driver_data);
 	if (r) {
 		fp_err("device initialisation failed, driver=%s", drv->name);
-		libusb_close(udevh);
+		switch (ddev->bus) {
+		case BUS_TYPE_USB:
+			libusb_close(dev->device.usb);
+		case BUS_TYPE_SPI:
+		case BUS_TYPE_VIRTUAL:
+			/* Nothing to do (this might change for SPI) */
+			break;
+		}
 		g_free(dev);
 	}
 
@@ -112,7 +130,16 @@ void fpi_drvcb_close_complete(struct fp_dev *dev)
 	BUG_ON(dev->state != DEV_STATE_DEINITIALIZING);
 	dev->state = DEV_STATE_DEINITIALIZED;
 	fpi_timeout_cancel_all_for_dev(dev);
-	libusb_close(dev->udev);
+
+	switch (dev->bus) {
+	case BUS_TYPE_USB:
+		libusb_close(dev->device.usb);
+	case BUS_TYPE_SPI:
+	case BUS_TYPE_VIRTUAL:
+		/* Nothing to do (this might change for SPI) */
+		break;
+	}
+
 	if (dev->close_cb)
 		dev->close_cb(dev, dev->close_cb_data);
 	g_free(dev);
@@ -680,3 +707,54 @@ API_EXPORTED int fp_async_capture_stop(struct fp_dev *dev,
 	}
 	return r;
 }
+
+/**
+ * fp_async_delete_finger:
+ * @dev: the struct #fp_dev device
+ * @data: data to delete. Must have been previously enrolled.
+ * @callback: the callback to call when data deleted.
+ * @user_data: user data to pass to the callback
+ *
+ * Request to delete data in sensor.
+ *
+ * Returns: 0 on success, non-zero on error
+ */
+API_EXPORTED int fp_async_delete_finger(struct fp_dev *dev,
+	struct fp_print_data *data, fp_delete_cb callback, void *user_data)
+{
+	struct fp_driver *drv;
+	int r;
+
+	g_return_val_if_fail(dev != NULL, -ENODEV);
+	g_return_val_if_fail (callback != NULL, -EINVAL);
+
+	drv = dev->drv;
+
+	G_DEBUG_HERE();
+	if (!drv->delete_finger)
+		return -ENOTSUP;
+
+	dev->state = DEV_STATE_DELETING;
+	dev->delete_cb = callback;
+	dev->delete_cb_data = user_data;
+	dev->delete_data = data;
+
+	r = drv->delete_finger(dev);
+	if (r < 0) {
+		dev->delete_cb = NULL;
+		dev->state = DEV_STATE_ERROR;
+		fp_err("failed to delete data, error %d", r);
+	}
+	return r;
+}
+
+/* Drivers call this when delete done */
+void fpi_drvcb_delete_complete(struct fp_dev *dev, int status)
+{
+	fp_dbg("status %d", status);
+	BUG_ON(dev->state != DEV_STATE_DELETING);
+	dev->state = (status) ? DEV_STATE_ERROR : DEV_STATE_DELETE_DONE;
+
+	if (dev->delete_cb)
+		dev->delete_cb(dev, status, dev->delete_cb_data);
+}

libfprint/fpi-async.h

@@ -36,4 +36,6 @@ void fpi_drvcb_report_verify_result(struct fp_dev *dev, int result,
 	struct fp_img *img);
 void fpi_drvcb_verify_stopped(struct fp_dev *dev);
 
+void fpi_drvcb_delete_complete(struct fp_dev *dev, int status);
+
 #endif

libfprint/fpi-core.c

@@ -181,7 +181,7 @@ API_EXPORTED struct fp_driver **fprint_get_drivers (void)
 	return (struct fp_driver **) g_ptr_array_free (array, FALSE);
 }
 
-static struct fp_driver *find_supporting_driver(libusb_device *udev,
+static struct fp_driver *find_supporting_usb_driver(libusb_device *udev,
 	const struct usb_id **usb_id, uint32_t *devtype)
 {
 	int ret;
@@ -207,10 +207,13 @@ static struct fp_driver *find_supporting_driver(libusb_device *udev,
 		uint32_t type = 0;
 		const struct usb_id *id;
 
-		for (id = drv->id_table; id->vendor; id++) {
+		if (drv->bus != BUS_TYPE_USB)
+			continue;
+
+		for (id = drv->id_table.usb; id->vendor; id++) {
 			if (dsc.idVendor == id->vendor && dsc.idProduct == id->product) {
-				if (drv->discover) {
-					int r = drv->discover(&dsc, &type);
+				if (drv->usb_discover) {
+					int r = drv->usb_discover(&dsc, &type);
 					if (r < 0)
 						fp_err("%s discover failed, code %d", drv->name, r);
 					if (r <= 0)
@@ -246,26 +249,81 @@ static struct fp_driver *find_supporting_driver(libusb_device *udev,
 	return best_drv;
 }
 
-static struct fp_dscv_dev *discover_dev(libusb_device *udev)
+static struct fp_dscv_dev *discover_usb_dev(libusb_device *udev)
 {
 	const struct usb_id *usb_id;
 	struct fp_driver *drv;
 	struct fp_dscv_dev *ddev;
 	uint32_t devtype;
 
-	drv = find_supporting_driver(udev, &usb_id, &devtype);
+	drv = find_supporting_usb_driver(udev, &usb_id, &devtype);
 
 	if (!drv)
 		return NULL;
 
 	ddev = g_malloc0(sizeof(*ddev));
 	ddev->drv = drv;
-	ddev->udev = udev;
+	ddev->bus = BUS_TYPE_USB;
+	ddev->desc.usb = udev;
 	ddev->driver_data = usb_id->driver_data;
 	ddev->devtype = devtype;
 	return ddev;
 }
 
+static void discover_usb_devs(GPtrArray *found_devices)
+{
+	libusb_device *udev;
+	libusb_device **devs;
+	int r;
+	int i = 0;
+
+	r = libusb_get_device_list(fpi_usb_ctx, &devs);
+	if (r < 0) {
+		fp_err("couldn't enumerate USB devices, error %d", r);
+		return;
+	}
+
+	/* Check each device against each driver, temporarily storing successfully
+	 * discovered devices in a GPtrArray. */
+	while ((udev = devs[i++]) != NULL) {
+		struct fp_dscv_dev *ddev = discover_usb_dev(udev);
+		if (!ddev)
+			continue;
+		/* discover_usb_dev() doesn't hold a reference to the udev,
+		 * so increase the reference for ddev to hold this ref */
+		libusb_ref_device(udev);
+		g_ptr_array_add (found_devices, (gpointer) ddev);
+	}
+	libusb_free_device_list(devs, 1);
+}
+
+static void discover_virtual_devs(GPtrArray *found_devices)
+{
+	GSList *elem;
+
+	for (elem = registered_drivers; elem; elem = g_slist_next(elem)) {
+		struct fp_driver *drv = elem->data;
+		struct fp_dscv_dev *ddev = NULL;
+		const gchar *var;
+
+		if (drv->bus != BUS_TYPE_VIRTUAL)
+			continue;
+
+		var = g_getenv (drv->id_table.virtual_envvar);
+
+		if (var == NULL)
+			continue;
+
+		ddev = g_malloc0(sizeof(*ddev));
+		ddev->drv = drv;
+		ddev->bus = BUS_TYPE_VIRTUAL;
+		ddev->desc.virtual_env = var;
+		ddev->devtype = 0;
+
+		g_ptr_array_add (found_devices, ddev);
+	}
+}
+
 /**
  * fp_discover_devs:
  *
@@ -279,39 +337,25 @@ static struct fp_dscv_dev *discover_dev(libusb_device *udev)
  */
 API_EXPORTED struct fp_dscv_dev **fp_discover_devs(void)
 {
-	GPtrArray *tmparray;
-	libusb_device *udev;
-	libusb_device **devs;
-	int r;
-	int i = 0;
+	GPtrArray *found_devices;
 
 	g_return_val_if_fail (registered_drivers != NULL, NULL);
 
-	r = libusb_get_device_list(fpi_usb_ctx, &devs);
-	if (r < 0) {
-		fp_err("couldn't enumerate USB devices, error %d", r);
+	found_devices = g_ptr_array_new ();
+
+	discover_usb_devs (found_devices);
+	discover_virtual_devs (found_devices);
+
+	/* Return NULL if no devices were found. */
+	if (found_devices->len == 0) {
+		g_ptr_array_free (found_devices, TRUE);
 		return NULL;
 	}
 
-	tmparray = g_ptr_array_new ();
-
-	/* Check each device against each driver, temporarily storing successfully
-	 * discovered devices in a GPtrArray. */
-	while ((udev = devs[i++]) != NULL) {
-		struct fp_dscv_dev *ddev = discover_dev(udev);
-		if (!ddev)
-			continue;
-		/* discover_dev() doesn't hold a reference to the udev,
-		 * so increase the reference for ddev to hold this ref */
-		libusb_ref_device(udev);
-		g_ptr_array_add (tmparray, (gpointer) ddev);
-	}
-	libusb_free_device_list(devs, 1);
-
 	/* Convert our temporary array into a standard NULL-terminated pointer
 	 * array. */
-	g_ptr_array_add (tmparray, NULL);
-	return (struct fp_dscv_dev **) g_ptr_array_free (tmparray, FALSE);
+	g_ptr_array_add (found_devices, NULL);
+	return (struct fp_dscv_dev **) g_ptr_array_free (found_devices, FALSE);
 }
 
 /**
@@ -330,7 +374,17 @@ API_EXPORTED void fp_dscv_devs_free(struct fp_dscv_dev **devs)
 		return;
 
 	for (i = 0; devs[i]; i++) {
-		libusb_unref_device(devs[i]->udev);
+		switch (devs[i]->bus) {
+		case BUS_TYPE_USB:
+			libusb_unref_device(devs[i]->desc.usb);
+			break;
+		case BUS_TYPE_SPI:
+			g_free(devs[i]->desc.spi_path);
+			break;
+		case BUS_TYPE_VIRTUAL:
+			/* Nothing to do */
+			break;
+		}
 		g_free(devs[i]);
 	}
 	g_free(devs);
@@ -703,6 +757,23 @@ API_EXPORTED int fp_dev_supports_identification(struct fp_dev *dev)
 	return dev->drv->identify_start != NULL;
 }
 
+/**
+ * fp_dev_supports_data_in_sensor:
+ * @dev: the struct #fp_dev device
+ *
+ * Determines if a device is capable of storing print data in sensor.
+ * Not all devices support this functionality.
+ *
+ * Returns: 1 if the device is capable of storing data in sensor, 0 otherwise.
+ */
+API_EXPORTED int fp_dev_supports_data_in_sensor(struct fp_dev *dev)
+{
+	g_return_val_if_fail(dev, 0);
+	g_return_val_if_fail(dev->drv, 0);
+
+	return dev->drv->delete_finger != NULL;
+}
+
 /**
  * fp_dev_get_img_width:
  * @dev: the struct #fp_dev device

libfprint/fpi-core.h

@@ -67,16 +67,37 @@ enum fp_driver_type {
 	DRIVER_IMAGING = 1,
 };
 
+/**
+ * fp_bus_type:
+ * @BUS_TYPE_USB: USB device
+ * @BUS_TYPE_SPI: SPI device
+ * @BUS_TYPE_VIRTUAL: Virtual test bus
+ *
+ * The bus type of the device/driver.
+ */
+enum fp_bus_type {
+	BUS_TYPE_USB,
+	BUS_TYPE_SPI,
+	BUS_TYPE_VIRTUAL
+};
+
 struct fp_driver {
 	const uint16_t id;
 	const char *name;
 	const char *full_name;
-	const struct usb_id * const id_table;
+
+	enum fp_bus_type bus;
+	union {
+		const struct usb_id * const usb;
+		const char * const *i2c;
+		const char * virtual_envvar;
+	} id_table;
+
 	enum fp_driver_type type;
 	enum fp_scan_type scan_type;
 
 	/* Device operations */
-	int (*discover)(struct libusb_device_descriptor *dsc, uint32_t *devtype);
+	int (*usb_discover)(struct libusb_device_descriptor *dsc, uint32_t *devtype);
 	int (*open)(struct fp_dev *dev, unsigned long driver_data);
 	void (*close)(struct fp_dev *dev);
 	int (*enroll_start)(struct fp_dev *dev);
@@ -87,6 +108,7 @@ struct fp_driver {
 	int (*identify_stop)(struct fp_dev *dev, gboolean iterating);
 	int (*capture_start)(struct fp_dev *dev);
 	int (*capture_stop)(struct fp_dev *dev);
+	int (*delete_finger)(struct fp_dev *dev);
 };
 
 /**

libfprint/fpi-dev.c

@@ -114,7 +114,34 @@ FP_INSTANCE_DATA (struct fp_dev *dev)
 libusb_device_handle *
 fpi_dev_get_usb_dev(struct fp_dev *dev)
 {
-	return dev->udev;
+	g_assert (dev->bus == BUS_TYPE_USB);
+
+	return dev->device.usb;
+}
+
+/**
+ * fpi_dev_get_virtual_env:
+ * @dev: a struct #fp_dev
+ *
+ * Returns the value of the environment variable that is assicated with
+ * the virtual device.
+ *
+ * Returns: the value of the environment variable
+ */
+const char *
+fpi_dev_get_virtual_env(struct fp_dev *dev)
+{
+	g_assert (dev->bus == BUS_TYPE_VIRTUAL);
+
+	return dev->device.virtual_env;
+}
+
+int
+fpi_dev_get_spi_dev(struct fp_dev *dev)
+{
+	g_assert (dev->bus == BUS_TYPE_SPI);
+
+	return dev->device.i2c;
 }
 
 /**
@@ -148,3 +175,17 @@ fpi_dev_get_verify_data(struct fp_dev *dev)
 {
 	return dev->verify_data;
 }
+
+/**
+ * fpi_dev_get_delete_data:
+ * @dev: a struct #fp_dev
+ *
+ * Returns the delete data associated with @dev.
+ *
+ * Returns: a struct #fp_print_data pointer or %NULL
+ */
+struct fp_print_data *
+fpi_dev_get_delete_data(struct fp_dev *dev)
+{
+	return dev->delete_data;
+}

libfprint/fpi-dev.h

@@ -40,8 +40,11 @@ void                     fp_dev_set_instance_data (struct fp_dev *dev,
 void                    *FP_INSTANCE_DATA         (struct fp_dev *dev);
 
 libusb_device_handle *fpi_dev_get_usb_dev(struct fp_dev *dev);
+const char *fpi_dev_get_virtual_env(struct fp_dev *dev);
+int fpi_dev_get_spi_dev(struct fp_dev *dev);
 void fpi_dev_set_nr_enroll_stages(struct fp_dev *dev,
 				  int nr_enroll_stages);
 struct fp_print_data *fpi_dev_get_verify_data(struct fp_dev *dev);
+struct fp_print_data *fpi_dev_get_delete_data(struct fp_dev *dev);
 
 #endif

libfprint/fpi-poll.c

@@ -28,6 +28,7 @@
 #include <sys/time.h>
 
 #include <glib.h>
+#include <glib-unix.h>
 #include <libusb.h>
 
 /**
@@ -75,64 +76,38 @@
  * for example.
  */
 
-/* this is a singly-linked list of pending timers, sorted with the timer that
- * is expiring soonest at the head. */
+static GMainContext *fpi_main_ctx = NULL;
 static GSList *active_timers = NULL;
 
 /* notifiers for added or removed poll fds */
 static fp_pollfd_added_cb fd_added_cb = NULL;
 static fp_pollfd_removed_cb fd_removed_cb = NULL;
 
+
 struct fpi_timeout {
-	struct timeval expiry;
-	fpi_timeout_fn callback;
-	struct fp_dev *dev;
-	void *data;
-	char *name;
+	fpi_timeout_fn  callback;
+	struct fp_dev  *dev;
+	void           *data;
+	GSource        *source;
 };
 
-static int timeout_sort_fn(gconstpointer _a, gconstpointer _b)
-{
-	fpi_timeout *a = (fpi_timeout *) _a;
-	fpi_timeout *b = (fpi_timeout *) _b;
-	struct timeval *tv_a = &a->expiry;
-	struct timeval *tv_b = &b->expiry;
-
-	if (timercmp(tv_a, tv_b, <))
-		return -1;
-	else if (timercmp(tv_a, tv_b, >))
-		return 1;
-	else
-		return 0;
-}
-
 static void
-fpi_timeout_free(fpi_timeout *timeout)
+fpi_timeout_destroy (gpointer data)
 {
-	if (timeout == NULL)
-		return;
+	fpi_timeout *timeout = data;
 
-	g_free(timeout->name);
-	g_free(timeout);
+	active_timers = g_slist_remove (active_timers, timeout);
+	g_free (timeout);
 }
 
-/**
- * fpi_timeout_set_name:
- * @timeout: a #fpi_timeout
- * @name: the name to give the timeout
- *
- * Sets a name for a timeout, allowing that name to be printed
- * along with any timeout related debug.
- */
-void
-fpi_timeout_set_name(fpi_timeout *timeout,
-		     const char  *name)
+static gboolean
+fpi_timeout_wrapper_cb (gpointer data)
 {
-	g_return_if_fail (timeout != NULL);
-	g_return_if_fail (name != NULL);
-	g_return_if_fail (timeout->name == NULL);
+	fpi_timeout *timeout = (fpi_timeout*) data;
 
-	timeout->name = g_strdup(name);
+	timeout->callback (timeout->dev, timeout->data);
+
+	return G_SOURCE_REMOVE;
 }
 
 /**
@@ -154,45 +129,39 @@ fpi_timeout_set_name(fpi_timeout *timeout,
  *
  * Returns: an #fpi_timeout structure
  */
-fpi_timeout *fpi_timeout_add(unsigned int    msec,
-			     fpi_timeout_fn  callback,
-			     struct fp_dev  *dev,
-			     void           *data)
+fpi_timeout *
+fpi_timeout_add(unsigned int    msec,
+		fpi_timeout_fn  callback,
+		struct fp_dev  *dev,
+		void           *data)
 {
-	struct timespec ts;
-	struct timeval add_msec;
 	fpi_timeout *timeout;
-	int r;
 
-	g_return_val_if_fail (dev != NULL, NULL);
+	timeout = g_new0 (fpi_timeout, 1);
+	timeout->source = g_timeout_source_new (msec);
+	active_timers = g_slist_prepend (active_timers, timeout);
 
-	fp_dbg("in %dms", msec);
-
-	r = clock_gettime(CLOCK_MONOTONIC, &ts);
-	if (r < 0) {
-		fp_err("failed to read monotonic clock, errno=%d", errno);
-		BUG();
-		return NULL;
-	}
-
-	timeout = g_new0(fpi_timeout, 1);
-	timeout->callback = callback;
-	timeout->dev = dev;
-	timeout->data = data;
-	TIMESPEC_TO_TIMEVAL(&timeout->expiry, &ts);
-
-	/* calculate timeout expiry by adding delay to current monotonic clock */
-	timerclear(&add_msec);
-	add_msec.tv_sec = msec / 1000;
-	add_msec.tv_usec = (msec % 1000) * 1000;
-	timeradd(&timeout->expiry, &add_msec, &timeout->expiry);
-
-	active_timers = g_slist_insert_sorted(active_timers, timeout,
-		timeout_sort_fn);
+	g_source_set_callback (timeout->source, fpi_timeout_wrapper_cb, timeout, fpi_timeout_destroy);
+	g_source_attach (timeout->source, fpi_main_ctx);
 
 	return timeout;
 }
 
+/**
+ * fpi_timeout_set_name:
+ * @timeout: a #fpi_timeout
+ * @name: the name to give the timeout
+ *
+ * Sets a name for a timeout, allowing that name to be printed
+ * along with any timeout related debug.
+ */
+void
+fpi_timeout_set_name(fpi_timeout *timeout,
+		     const char  *name)
+{
+	g_source_set_name (timeout->source, name);
+}
+
 /**
  * fpi_timeout_cancel:
  * @timeout: an #fpi_timeout structure
@@ -200,81 +169,110 @@ fpi_timeout *fpi_timeout_add(unsigned int    msec,
  * Cancels a timeout scheduled with fpi_timeout_add(), and frees the
  * @timeout structure.
  */
-void fpi_timeout_cancel(fpi_timeout *timeout)
+void
+fpi_timeout_cancel(fpi_timeout *timeout)
 {
-	G_DEBUG_HERE();
-	active_timers = g_slist_remove(active_timers, timeout);
-	fpi_timeout_free(timeout);
+	g_source_destroy (timeout->source);
 }
 
-/* get the expiry time and optionally the timeout structure for the next
- * timeout. returns 0 if there are no expired timers, or 1 if the
- * timeval/timeout output parameters were populated. if the returned timeval
- * is zero then it means the timeout has already expired and should be handled
- * ASAP. */
-static int get_next_timeout_expiry(struct timeval *out,
-	struct fpi_timeout **out_timeout)
+struct fpi_io_condition {
+	fpi_io_condition_fn  callback;
+	int                  fd;
+	struct fp_dev       *dev;
+	void                *data;
+	GSource             *source;
+};
+
+static gboolean
+fpi_io_condition_wrapper_cb (int fd, GIOCondition cond, gpointer data)
 {
-	struct timespec ts;
-	struct timeval tv;
-	struct fpi_timeout *next_timeout;
-	int r;
+	fpi_io_condition *io_cond = data;
+	short events = 0;
 
-	if (active_timers == NULL)
-		return 0;
+	if (cond & G_IO_IN)
+		events |= POLL_IN;
+	if (cond & G_IO_OUT)
+		events |= POLL_OUT;
+	if (cond & G_IO_PRI)
+		events |= POLL_PRI;
+	if (cond & G_IO_ERR)
+		events |= POLL_ERR;
+	if (cond & G_IO_HUP)
+		events |= POLL_HUP;
 
-	r = clock_gettime(CLOCK_MONOTONIC, &ts);
-	if (r < 0) {
-		fp_err("failed to read monotonic clock, errno=%d", errno);
-		return r;
-	}
-	TIMESPEC_TO_TIMEVAL(&tv, &ts);
+	io_cond->callback (io_cond->dev, fd, cond, io_cond->data);
 
-	next_timeout = active_timers->data;
-	if (out_timeout)
-		*out_timeout = next_timeout;
-
-	if (timercmp(&tv, &next_timeout->expiry, >=)) {
-		if (next_timeout->name)
-			fp_dbg("first timeout '%s' already expired", next_timeout->name);
-		else
-			fp_dbg("first timeout already expired");
-		timerclear(out);
-	} else {
-		timersub(&next_timeout->expiry, &tv, out);
-		if (next_timeout->name)
-			fp_dbg("next timeout '%s' in %ld.%06lds", next_timeout->name,
-			       out->tv_sec, out->tv_usec);
-		else
-			fp_dbg("next timeout in %ld.%06lds", out->tv_sec, out->tv_usec);
-	}
-
-	return 1;
+	return G_SOURCE_CONTINUE;
 }
 
-/* handle a timeout that has expired */
-static void handle_timeout(struct fpi_timeout *timeout)
+static void
+fpi_io_condition_destroy (gpointer data)
 {
-	G_DEBUG_HERE();
-	timeout->callback(timeout->dev, timeout->data);
-	active_timers = g_slist_remove(active_timers, timeout);
-	fpi_timeout_free(timeout);
+	fpi_io_condition *io_cond = data;
+
+	if (fd_removed_cb)
+		fd_removed_cb(io_cond->fd);
+
+	g_free (io_cond);
 }
 
-static int handle_timeouts(void)
+fpi_io_condition *
+fpi_io_condition_add(int                  fd,
+		     short int            events,
+		     fpi_io_condition_fn  callback,
+		     struct fp_dev       *dev,
+		     void                *data)
 {
-	struct timeval next_timeout_expiry;
-	struct fpi_timeout *next_timeout;
-	int r;
+	fpi_io_condition *io_cond;
+	GIOCondition cond = 0;
 
-	r = get_next_timeout_expiry(&next_timeout_expiry, &next_timeout);
-	if (r <= 0)
-		return r;
+	if (events & POLL_IN)
+		cond |= G_IO_IN;
+	if (events & POLL_OUT)
+		cond |= G_IO_OUT;
+	if (events & POLL_PRI)
+		cond |= G_IO_PRI;
+	if (events & POLL_ERR)
+		cond |= G_IO_ERR;
+	if (events & POLL_HUP)
+		cond |= G_IO_HUP;
 
-	if (!timerisset(&next_timeout_expiry))
-		handle_timeout(next_timeout);
+	io_cond = g_new0 (fpi_io_condition, 1);
+	io_cond->source = g_unix_fd_source_new (fd, cond);
+	io_cond->fd = fd;
+	io_cond->callback = callback;
+	io_cond->data = data;
+	io_cond->dev = dev;
 
-	return 0;
+	g_source_set_callback (io_cond->source,
+			       G_SOURCE_FUNC (fpi_io_condition_wrapper_cb),
+			       io_cond,
+			       fpi_io_condition_destroy);
+	g_source_attach (io_cond->source, fpi_main_ctx);
+
+	if (fd_added_cb)
+		fd_added_cb(fd, events);
+
+	return io_cond;
+}
+
+void
+fpi_io_condition_set_name(fpi_io_condition *io_cond,
+			  const char       *name)
+{
+	g_source_set_name (io_cond->source, name);
+}
+
+void
+fpi_io_condition_remove(fpi_io_condition *io_cond)
+{
+	g_source_destroy(io_cond->source);
+}
+
+static gboolean
+dummy_cb (gpointer user_data)
+{
+	return G_SOURCE_REMOVE;
 }
 
 /**
@@ -290,37 +288,22 @@ static int handle_timeouts(void)
  */
 API_EXPORTED int fp_handle_events_timeout(struct timeval *timeout)
 {
-	struct timeval next_timeout_expiry;
-	struct timeval select_timeout;
-	struct fpi_timeout *next_timeout;
-	int r;
+	GSource *timeout_source;
 
-	r = get_next_timeout_expiry(&next_timeout_expiry, &next_timeout);
-	if (r < 0)
-		return r;
-
-	if (r) {
-		/* timer already expired? */
-		if (!timerisset(&next_timeout_expiry)) {
-			handle_timeout(next_timeout);
-			return 0;
-		}
-
-		/* choose the smallest of next URB timeout or user specified timeout */
-		if (timercmp(&next_timeout_expiry, timeout, <))
-			select_timeout = next_timeout_expiry;
-		else
-			select_timeout = *timeout;
-	} else {
-		select_timeout = *timeout;
+	if (timeout->tv_sec == 0 && timeout->tv_usec == 0) {
+		g_main_context_iteration (fpi_main_ctx, FALSE);
+		return 0;
 	}
 
-	r = libusb_handle_events_timeout(fpi_usb_ctx, &select_timeout);
-	*timeout = select_timeout;
-	if (r < 0)
-		return r;
+	/* Register a timeout on the mainloop and then run in blocking mode */
+	timeout_source = g_timeout_source_new (timeout->tv_sec * 1000 + timeout->tv_usec / 1000);
+	g_source_set_name (timeout_source, "fpi poll timeout");
+	g_source_set_callback (timeout_source, dummy_cb, NULL, NULL);
+	g_source_attach (timeout_source, fpi_main_ctx);
+	g_main_context_iteration (fpi_main_ctx, TRUE);
+	g_source_destroy (timeout_source);
 
-	return handle_timeouts();
+	return 0;
 }
 
 /**
@@ -350,35 +333,37 @@ API_EXPORTED int fp_handle_events(void)
  */
 API_EXPORTED int fp_get_next_timeout(struct timeval *tv)
 {
-	struct timeval fprint_timeout = { 0, 0 };
-	struct timeval libusb_timeout = { 0, 0 };
-	int r_fprint;
-	int r_libusb;
+	int timeout_;
 
-	r_fprint = get_next_timeout_expiry(&fprint_timeout, NULL);
-	r_libusb = libusb_get_next_timeout(fpi_usb_ctx, &libusb_timeout);
+	g_return_val_if_fail (g_main_context_acquire (fpi_main_ctx), 0);
 
-	/* if we have no pending timeouts and the same is true for libusb,
-	 * indicate that we have no pending timouts */
-	if (r_fprint <= 0 && r_libusb <= 0)
+	g_main_context_query (fpi_main_ctx,
+			      G_MININT,
+			      &timeout_,
+			      NULL,
+			      0);
+
+	if (timeout_ < 0)
 		return 0;
 
-	/* if fprint have no pending timeouts return libusb timeout */
-	else if (r_fprint == 0)
-		*tv = libusb_timeout;
+	tv->tv_sec = timeout_ / 1000;
+	tv->tv_usec = (timeout_ % 1000) * 1000;
 
-	/* if libusb have no pending timeouts return fprint timeout */
-	else if (r_libusb == 0)
-		*tv = fprint_timeout;
-
-	/* otherwise return the smaller of the 2 timeouts */
-	else if (timercmp(&fprint_timeout, &libusb_timeout, <))
-		*tv = fprint_timeout;
-	else
-		*tv = libusb_timeout;
 	return 1;
 }
 
+typedef struct {
+	GSource source;
+	GSList *fds;
+} fpi_libusb_source;
+
+typedef struct {
+	int fd;
+	gpointer tag;
+} fpi_libusb_fd;
+
+static fpi_libusb_source *libusb_source = NULL;
+
 /**
  * fp_get_pollfds:
  * @pollfds: output location for a list of pollfds. If non-%NULL, must be
@@ -394,33 +379,52 @@ API_EXPORTED int fp_get_next_timeout(struct timeval *tv)
  */
 API_EXPORTED ssize_t fp_get_pollfds(struct fp_pollfd **pollfds)
 {
-	const struct libusb_pollfd **usbfds;
-	const struct libusb_pollfd *usbfd;
-	struct fp_pollfd *ret;
-	ssize_t cnt = 0;
-	size_t i = 0;
+	gint timeout_;
+	GPollFD fds_static[16];
+	GPollFD *fds = fds_static;
+	gint n_fds;
+	int i;
 
-	g_return_val_if_fail (fpi_usb_ctx != NULL, -EIO);
+	g_return_val_if_fail (g_main_context_acquire (fpi_main_ctx), -1);
 
-	usbfds = libusb_get_pollfds(fpi_usb_ctx);
-	if (!usbfds) {
-		*pollfds = NULL;
-		return -EIO;
+	n_fds = g_main_context_query (fpi_main_ctx,
+				      G_MININT,
+				      &timeout_,
+				      fds,
+				      G_N_ELEMENTS (fds_static));
+
+	if (n_fds > G_N_ELEMENTS (fds_static)) {
+		fds = g_new0 (GPollFD, n_fds);
+
+		n_fds = g_main_context_query (fpi_main_ctx,
+					      G_MININT,
+					      &timeout_,
+					      fds,
+					      n_fds);
 	}
 
-	while ((usbfd = usbfds[i++]) != NULL)
-		cnt++;
+	g_main_context_release (fpi_main_ctx);
 
-	ret = g_malloc(sizeof(struct fp_pollfd) * cnt);
-	i = 0;
-	while ((usbfd = usbfds[i]) != NULL) {
-		ret[i].fd = usbfd->fd;
-		ret[i].events = usbfd->events;
-		i++;
+	*pollfds = g_new0 (struct fp_pollfd, n_fds);
+	for (i = 0; i < n_fds; i++) {
+		(*pollfds)[i].fd = fds[i].fd;
+
+		if (fds[i].events & G_IO_IN)
+			(*pollfds)[i].events |= POLL_IN;
+		if (fds[i].events & G_IO_OUT)
+			(*pollfds)[i].events |= POLL_OUT;
+		if (fds[i].events & G_IO_PRI)
+			(*pollfds)[i].events |= POLL_PRI;
+		if (fds[i].events & G_IO_ERR)
+			(*pollfds)[i].events |= POLL_ERR;
+		if (fds[i].events & G_IO_HUP)
+			(*pollfds)[i].events |= POLL_HUP;
 	}
 
-	*pollfds = ret;
-	return cnt;
+	if (fds != fds_static)
+		g_free (fds);
+
+	return n_fds;
 }
 
 /**
@@ -440,30 +444,129 @@ API_EXPORTED void fp_set_pollfd_notifiers(fp_pollfd_added_cb added_cb,
 
 static void add_pollfd(int fd, short events, void *user_data)
 {
+	GIOCondition io_cond = 0;
+	fpi_libusb_fd *data;
+	gpointer tag;
+
+	if (events & POLL_IN)
+		io_cond |= G_IO_IN;
+	if (events & POLL_OUT)
+		io_cond |= G_IO_OUT;
+	if (events & POLL_PRI)
+		io_cond |= G_IO_PRI;
+	if (events & POLL_ERR)
+		io_cond |= G_IO_ERR;
+	if (events & POLL_HUP)
+		io_cond |= G_IO_HUP;
+
+	tag = g_source_add_unix_fd (&libusb_source->source, fd, io_cond);
+
+	data = g_new0 (fpi_libusb_fd, 1);
+	data->fd = fd;
+	data->tag = tag;
+
+	libusb_source->fds = g_slist_prepend (libusb_source->fds, data);
+
 	if (fd_added_cb)
 		fd_added_cb(fd, events);
 }
 
 static void remove_pollfd(int fd, void *user_data)
 {
+	GSList *elem = g_slist_find_custom (libusb_source->fds, &fd, g_int_equal);
+	fpi_libusb_fd *item;
+
+	g_return_if_fail (elem != NULL);
+
+	item = (fpi_libusb_fd*) elem->data;
+
+	g_source_remove_unix_fd (&libusb_source->source, item->tag);
+
+	libusb_source->fds = g_slist_remove_link (libusb_source->fds, elem);
+	g_slist_free (elem);
+	g_free (item);
+
 	if (fd_removed_cb)
 		fd_removed_cb(fd);
 }
 
+static gboolean
+fpi_libusb_prepare (GSource    *source,
+                    gint       *timeout_)
+{
+	struct timeval tv;
+
+	*timeout_ = -1;
+
+	if (libusb_get_next_timeout(fpi_usb_ctx, &tv) == 1) {
+		if (tv.tv_sec == 0 && tv.tv_usec == 0)
+			return TRUE;
+
+		*timeout_ = tv.tv_sec * 1000 + tv.tv_usec / 1000;
+	}
+
+	return FALSE;
+}
+
+static gboolean
+fpi_libusb_check (GSource *source)
+{
+	/* Just call into libusb for every mainloop cycle */
+	return TRUE;
+}
+
+static gboolean
+fpi_libusb_dispatch (GSource     *source,
+                     GSourceFunc  callback,
+                     gpointer     user_data)
+{
+	struct timeval zero_tv = { 0, 0 };
+
+	libusb_handle_events_timeout (fpi_usb_ctx, &zero_tv);
+
+	return G_SOURCE_CONTINUE;
+}
+
+static void
+fpi_libusb_finalize (GSource *source)
+{
+	fpi_libusb_source *fpi_source = (fpi_libusb_source*) source;
+
+	g_slist_free_full (fpi_source->fds, g_free);
+}
+
+GSourceFuncs libusb_source_funcs = {
+	.prepare = fpi_libusb_prepare,
+	.check = fpi_libusb_check,
+	.dispatch = fpi_libusb_dispatch,
+	.finalize = fpi_libusb_finalize,
+};
+
 void fpi_poll_init(void)
 {
+	fpi_main_ctx = g_main_context_new ();
+
+	libusb_source = (fpi_libusb_source*) g_source_new (&libusb_source_funcs, sizeof(fpi_libusb_source));
+	g_source_set_name (&libusb_source->source, "libfprint internal libusb source");
+	g_source_attach (&libusb_source->source, fpi_main_ctx);
+
 	libusb_set_pollfd_notifiers(fpi_usb_ctx, add_pollfd, remove_pollfd, NULL);
 }
 
 void fpi_poll_exit(void)
 {
-	g_slist_free_full(active_timers, (GDestroyNotify) fpi_timeout_free);
-	active_timers = NULL;
+	g_source_destroy (&libusb_source->source);
+	libusb_source = NULL;
+	g_main_context_unref (fpi_main_ctx);
+	fpi_main_ctx = NULL;
+
 	fd_added_cb = NULL;
 	fd_removed_cb = NULL;
+
 	libusb_set_pollfd_notifiers(fpi_usb_ctx, NULL, NULL, NULL);
 }
 
+
 void
 fpi_timeout_cancel_all_for_dev(struct fp_dev *dev)
 {
@@ -473,13 +576,10 @@ fpi_timeout_cancel_all_for_dev(struct fp_dev *dev)
 
 	l = active_timers;
 	while (l) {
-		struct fpi_timeout *timeout = l->data;
-		GSList *current = l;
+		fpi_timeout *cb_data = l->data;
 
 		l = l->next;
-		if (timeout->dev == dev) {
-			g_free (timeout);
-			active_timers = g_slist_delete_link (active_timers, current);
-		}
+		if (cb_data->dev == dev)
+			g_source_destroy (cb_data->source);
 	}
 }

libfprint/fpi-poll.h

@@ -48,4 +48,34 @@ void fpi_timeout_set_name(fpi_timeout *timeout,
 			  const char  *name);
 void fpi_timeout_cancel(fpi_timeout *timeout);
 
+
+/**
+ * fpi_io_condition_fn:
+ * @dev: the struct #fp_dev passed to fpi_io_condition_add()
+ * @fd: the registered file descriptor
+ * @events: The events that poll returend for the descriptor
+ * @data: the data passed to fpi_io_condition_add()
+ *
+ * The prototype of the callback function for fpi_io_condition_add().
+ * Note that structure will be free'ed when unregistering the condition.
+ */
+typedef void (*fpi_io_condition_fn)(struct fp_dev *dev, int fd, short int events, void *data);
+
+/**
+ * fpi_io_cond:
+ *
+ * An opaque structure representing a pollable file descriptor and a
+ * callback function created with fpi_io_condition_add().
+ */
+typedef struct fpi_io_condition fpi_io_condition;
+
+fpi_io_condition *fpi_io_condition_add(int                  fd,
+				       short int            events,
+				       fpi_io_condition_fn  callback,
+				       struct fp_dev       *dev,
+				       void                *data);
+void fpi_io_condition_set_name(fpi_io_condition *io_cond,
+			       const char       *name);
+void fpi_io_condition_remove(fpi_io_condition *io_cond);
+
 #endif

libfprint/fpi-sync.c

@@ -441,6 +441,70 @@ API_EXPORTED int fp_verify_finger(struct fp_dev *dev,
 	return fp_verify_finger_img(dev, enrolled_print, NULL);
 }
 
+struct sync_delete_data {
+	gboolean populated;
+	int result;
+};
+
+static void sync_delete_cb(struct fp_dev *dev, int result, void *user_data)
+{
+	struct sync_delete_data *ddata = user_data;
+	ddata->result = result;
+	ddata->populated = TRUE;
+}
+
+/**
+ * fp_delete_finger:
+ * @dev: the struct #fp_dev device to perform the operation.
+ * @enrolled_data: the id need to delete on sensor. This id is
+ * returned in previously enrolled with a MIS device.
+ *
+ * Perform a delete data operation on sensor. When print data is stored on
+ * sensor, this function is needed when host deletes enrolled finger.
+ *
+ * Returns: negative code on error, otherwise a code from #fp_delete_result
+ */
+
+API_EXPORTED int fp_delete_finger(struct fp_dev *dev,
+	struct fp_print_data *enrolled_data)
+{
+	struct sync_delete_data *ddata;
+	gboolean stopped = FALSE;
+	int r;
+
+	if (!enrolled_data) {
+		fp_err("no print given");
+		return -EINVAL;
+	}
+
+	if (!fp_dev_supports_print_data(dev, enrolled_data)) {
+		fp_err("print is not compatible with device");
+		return -EINVAL;
+	}
+
+	fp_dbg("to be handled by %s", dev->drv->name);
+	ddata = g_malloc0(sizeof(struct sync_delete_data));
+	r = fp_async_delete_finger(dev, enrolled_data, sync_delete_cb, ddata);
+	if (r < 0) {
+		fp_dbg("delete_finger error %d", r);
+		g_free(ddata);
+		return r;
+	}
+
+	while (!ddata->populated) {
+		r = fp_handle_events();
+		if (r < 0)
+			goto out;
+	}
+
+	r = ddata->result;
+	fp_dbg("delete_finger result %d", r);
+
+out:
+	g_free(ddata);
+	return r;
+}
+
 struct sync_identify_data {
 	gboolean populated;
 	int result;

libfprint/fprint-list-supported-devices.c

@@ -31,10 +31,11 @@ static GList *insert_driver (GList *list,
 {
     int i;
 
-    for (i = 0; driver->id_table[i].vendor != 0; i++) {
+    for (i = 0; driver->id_table.usb[i].vendor != 0; i++) {
         char *key;
 
-	key = g_strdup_printf ("%04x:%04x", driver->id_table[i].vendor, driver->id_table[i].product);
+	key = g_strdup_printf ("%04x:%04x", driver->id_table.usb[i].vendor,
+                               driver->id_table.usb[i].product);
 
 	if (g_hash_table_lookup (printed, key) != NULL) {
 	    g_free (key);

libfprint/fprint-list-udev-rules.c

@@ -40,7 +40,8 @@ static const struct usb_id blacklist_id_table[] = {
 };
 
 struct fp_driver whitelist = {
-    .id_table = whitelist_id_table,
+    .bus = BUS_TYPE_USB,
+    .id_table.usb = whitelist_id_table,
     .full_name = "Hardcoded whitelist"
 };
 
@@ -52,13 +53,13 @@ static void print_driver (struct fp_driver *driver)
 
     num_printed = 0;
 
-    for (i = 0; driver->id_table[i].vendor != 0; i++) {
+    for (i = 0; driver->id_table.usb[i].vendor != 0; i++) {
         char *key;
 
 	blacklist = 0;
 	for (j = 0; blacklist_id_table[j].vendor != 0; j++) {
-	    if (driver->id_table[i].vendor == blacklist_id_table[j].vendor &&
-		driver->id_table[i].product == blacklist_id_table[j].product) {
+	    if (driver->id_table.usb[i].vendor == blacklist_id_table[j].vendor &&
+		driver->id_table.usb[i].product == blacklist_id_table[j].product) {
 		blacklist = 1;
 		break;
 	    }
@@ -66,7 +67,8 @@ static void print_driver (struct fp_driver *driver)
 	if (blacklist)
 	    continue;
 
-	key = g_strdup_printf ("%04x:%04x", driver->id_table[i].vendor, driver->id_table[i].product);
+	key = g_strdup_printf ("%04x:%04x", driver->id_table.usb[i].vendor,
+                               driver->id_table.usb[i].product);
 
 	if (g_hash_table_lookup (printed, key) != NULL) {
 	    g_free (key);
@@ -78,8 +80,12 @@ 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\", ENV{LIBFPRINT_DRIVER}=\"%s\"\n", driver->id_table[i].vendor, driver->id_table[i].product, 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.usb[i].vendor,
+                driver->id_table.usb[i].product);
+	printf ("SUBSYSTEM==\"usb\", ATTRS{idVendor}==\"%04x\", ATTRS{idProduct}==\"%04x\", ENV{LIBFPRINT_DRIVER}=\"%s\"\n",
+                driver->id_table.usb[i].vendor,
+                driver->id_table.usb[i].product, driver->full_name);
 	num_printed++;
     }
 

libfprint/fprint.h

@@ -267,12 +267,17 @@ int fp_verify_finger(struct fp_dev *dev,
 	struct fp_print_data *enrolled_print);
 
 int fp_dev_supports_identification(struct fp_dev *dev);
+int fp_dev_supports_data_in_sensor(struct fp_dev *dev);
+
 int fp_identify_finger_img(struct fp_dev *dev,
 	struct fp_print_data **print_gallery, size_t *match_offset,
 	struct fp_img **img);
 int fp_identify_finger(struct fp_dev *dev,
 	struct fp_print_data **print_gallery, size_t *match_offset);
 
+int fp_delete_finger(struct fp_dev *dev,
+	struct fp_print_data *enrolled_print);
+
 /* Data handling */
 int fp_print_data_load(struct fp_dev *dev, enum fp_finger finger,
 	struct fp_print_data **data) LIBFPRINT_DEPRECATED;
@@ -451,6 +456,21 @@ int fp_async_capture_start(struct fp_dev *dev, int unconditional, fp_img_operati
 
 int fp_async_capture_stop(struct fp_dev *dev, fp_operation_stop_cb callback, void *user_data);
 
+/**
+ * fp_delete_result:
+ * @FP_DELETE_COMPLETE: Delete completed successfully.
+ * @FP_DELETE_FAIL: Delete failed
+ *
+ */
+enum fp_delete_result {
+	FP_DELETE_COMPLETE = 0,
+	FP_DELETE_FAIL = 1,
+};
+
+typedef void (*fp_delete_cb)(struct fp_dev *dev, int status, void *user_data);
+
+int fp_async_delete_finger(struct fp_dev *dev, struct fp_print_data *data, fp_delete_cb callback, void *user_data);
+
 #ifdef __cplusplus
 }
 #endif

libfprint/meson.build

@@ -124,6 +124,12 @@ foreach driver: drivers
     if driver == 'elan'
         drivers_sources += [ 'drivers/elan.c' ]
     endif
+    if driver == 'virtual_imgdev'
+        drivers_sources += [ 'drivers/virtual_imgdev.c' ]
+    endif
+    if driver == 'virtual_misdev'
+        drivers_sources += [ 'drivers/virtual_misdev.c' ]
+    endif
 endforeach
 
 if aeslib

meson.build

@@ -45,8 +45,8 @@ mathlib_dep = cc.find_library('m', required: false)
 
 # Drivers
 drivers = get_option('drivers').split(',')
-all_drivers = [ 'upekts', 'upektc', 'upeksonly', 'vcom5s', 'uru4000', 'aes1610', 'aes1660', 'aes2501', 'aes2550', 'aes2660', 'aes3500', 'aes4000', 'vfs101', 'vfs301', 'vfs5011', 'upektc_img', 'etes603', 'vfs0050', 'elan' ]
-primitive_drivers = [ 'upekts' ]
+all_drivers = [ 'upekts', 'upektc', 'upeksonly', 'vcom5s', 'uru4000', 'aes1610', 'aes1660', 'aes2501', 'aes2550', 'aes2660', 'aes3500', 'aes4000', 'vfs101', 'vfs301', 'vfs5011', 'upektc_img', 'etes603', 'vfs0050', 'elan', 'virtual_imgdev', 'virtual_misdev' ]
+primitive_drivers = [ 'upekts', 'virtual_misdev' ]
 
 if drivers == [ 'all' ]
     drivers = all_drivers