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libfprint/libfprint/drivers/virtual-device.c
Marco Trevisan (Treviño) 8d545a0b95 fpi-device: Add FpiDeviceFeature flags to FpDeviceClass 
Allows drivers to define more fine grained features for devices, not
strictly depending on assumptions we can make depending on the
implemented vfuncs.

We keep this per class but could be in theory moved to each instance.

In any case, added an utility function to initialize it in the way we
can ensure that we've a consistent way for setting them across all the
devices.
2021-04-12 22:14:06 +02:00

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/*
* Virtual driver for "simple" device debugging
*
* Copyright (C) 2019 Benjamin Berg <bberg@redhat.com>
* Copyright (C) 2020 Bastien Nocera <hadess@hadess.net>
* Copyright (C) 2020 Marco Trevisan <marco.trevisan@canonical.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 non-image based drivers. A small
* python script is provided to connect to it via a socket, allowing
* prints to registered programmatically.
* Using this, it is possible to test libfprint and fprintd.
*/
#define FP_COMPONENT "virtual_device"
#include "virtual-device-private.h"
#include "fpi-log.h"
G_DEFINE_TYPE (FpDeviceVirtualDevice, fpi_device_virtual_device, FP_TYPE_DEVICE)
#define INSERT_CMD_PREFIX "INSERT "
#define REMOVE_CMD_PREFIX "REMOVE "
#define SCAN_CMD_PREFIX "SCAN "
#define ERROR_CMD_PREFIX "ERROR "
#define RETRY_CMD_PREFIX "RETRY "
#define FINGER_CMD_PREFIX "FINGER "
#define SLEEP_CMD_PREFIX "SLEEP "
#define SET_ENROLL_STAGES_PREFIX "SET_ENROLL_STAGES "
#define SET_SCAN_TYPE_PREFIX "SET_SCAN_TYPE "
#define SET_CANCELLATION_PREFIX "SET_CANCELLATION_ENABLED "
#define SET_KEEP_ALIVE_PREFIX "SET_KEEP_ALIVE "
#define LIST_CMD "LIST"
#define UNPLUG_CMD "UNPLUG"
static void
maybe_continue_current_action (FpDeviceVirtualDevice *self)
{
FpDevice *dev = FP_DEVICE (self);
if (self->sleep_timeout_id)
return;
switch (fpi_device_get_current_action (dev))
{
case FPI_DEVICE_ACTION_ENROLL:
FP_DEVICE_GET_CLASS (self)->enroll (dev);
break;
case FPI_DEVICE_ACTION_VERIFY:
FP_DEVICE_GET_CLASS (self)->verify (dev);
break;
case FPI_DEVICE_ACTION_IDENTIFY:
FP_DEVICE_GET_CLASS (self)->identify (dev);
break;
case FPI_DEVICE_ACTION_LIST:
FP_DEVICE_GET_CLASS (self)->list (dev);
break;
case FPI_DEVICE_ACTION_DELETE:
FP_DEVICE_GET_CLASS (self)->delete (dev);
break;
case FPI_DEVICE_ACTION_OPEN:
FP_DEVICE_GET_CLASS (self)->open (dev);
break;
case FPI_DEVICE_ACTION_CLOSE:
FP_DEVICE_GET_CLASS (self)->close (dev);
break;
default:
break;
}
}
static gboolean
sleep_timeout_cb (gpointer data)
{
FpDeviceVirtualDevice *self = data;
self->sleep_timeout_id = 0;
if (g_cancellable_is_cancelled (self->cancellable))
return FALSE;
g_debug ("Sleeping completed");
maybe_continue_current_action (self);
return FALSE;
}
char *
process_cmds (FpDeviceVirtualDevice * self,
gboolean scan,
GError **error)
{
if (g_cancellable_is_cancelled (self->cancellable) ||
(fpi_device_get_current_action (FP_DEVICE (self)) != FPI_DEVICE_ACTION_NONE &&
g_cancellable_is_cancelled (fpi_device_get_cancellable (FP_DEVICE (self)))))
{
g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_CANCELLED,
"Operation was cancelled");
return NULL;
}
while (self->pending_commands->len > 0)
{
gchar *cmd = g_ptr_array_index (self->pending_commands, 0);
g_debug ("Processing command %s", cmd);
/* These are always processed. */
if (g_str_has_prefix (cmd, INSERT_CMD_PREFIX))
{
g_assert (self->prints_storage);
g_hash_table_add (self->prints_storage,
g_strdup (cmd + strlen (INSERT_CMD_PREFIX)));
g_ptr_array_remove_index (self->pending_commands, 0);
continue;
}
else if (g_str_has_prefix (cmd, REMOVE_CMD_PREFIX))
{
g_assert (self->prints_storage);
if (!g_hash_table_remove (self->prints_storage,
cmd + strlen (REMOVE_CMD_PREFIX)))
g_warning ("ID %s was not found in storage", cmd + strlen (REMOVE_CMD_PREFIX));
g_ptr_array_remove_index (self->pending_commands, 0);
continue;
}
else if (g_str_has_prefix (cmd, SLEEP_CMD_PREFIX))
{
guint64 sleep_ms = g_ascii_strtoull (cmd + strlen (SLEEP_CMD_PREFIX), NULL, 10);
g_debug ("Sleeping %lums", sleep_ms);
self->sleep_timeout_id = g_timeout_add (sleep_ms, sleep_timeout_cb, self);
g_ptr_array_remove_index (self->pending_commands, 0);
return NULL;
}
else if (g_str_has_prefix (cmd, ERROR_CMD_PREFIX))
{
g_propagate_error (error,
fpi_device_error_new (g_ascii_strtoull (cmd + strlen (ERROR_CMD_PREFIX), NULL, 10)));
g_ptr_array_remove_index (self->pending_commands, 0);
return NULL;
}
/* If we are not scanning, then we have to stop here. */
if (!scan)
{
g_warning ("Could not process command: %s", cmd);
g_ptr_array_remove_index (self->pending_commands, 0);
break;
}
if (g_str_has_prefix (cmd, SCAN_CMD_PREFIX))
{
char *res = g_strdup (cmd + strlen (SCAN_CMD_PREFIX));
g_ptr_array_remove_index (self->pending_commands, 0);
return res;
}
else if (g_str_has_prefix (cmd, RETRY_CMD_PREFIX))
{
g_propagate_error (error,
fpi_device_retry_new (g_ascii_strtoull (cmd + strlen (RETRY_CMD_PREFIX), NULL, 10)));
g_ptr_array_remove_index (self->pending_commands, 0);
return NULL;
}
else if (g_str_has_prefix (cmd, FINGER_CMD_PREFIX))
{
gboolean finger_present;
finger_present = g_ascii_strtoull (cmd + strlen (FINGER_CMD_PREFIX), NULL, 10) != 0;
fpi_device_report_finger_status_changes (FP_DEVICE (self),
finger_present ? FP_FINGER_STATUS_PRESENT : FP_FINGER_STATUS_NONE,
finger_present ? FP_FINGER_STATUS_NONE : FP_FINGER_STATUS_PRESENT);
g_ptr_array_remove_index (self->pending_commands, 0);
continue;
}
else
{
g_warning ("Could not process command: %s", cmd);
g_ptr_array_remove_index (self->pending_commands, 0);
}
}
/* No commands left, throw a timeout error. */
g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_NOT_FOUND, "No commands left that can be run!");
return NULL;
}
static void
write_key_to_listener (void *key, void *val, void *user_data)
{
FpiDeviceVirtualListener *listener = FPI_DEVICE_VIRTUAL_LISTENER (user_data);
if (!fpi_device_virtual_listener_write_sync (listener, key, strlen (key), NULL) ||
!fpi_device_virtual_listener_write_sync (listener, "\n", 1, NULL))
g_warning ("Error writing reply to LIST command");
}
static void
recv_instruction_cb (GObject *source_object,
GAsyncResult *res,
gpointer user_data)
{
g_autoptr(GError) error = NULL;
FpiDeviceVirtualListener *listener = FPI_DEVICE_VIRTUAL_LISTENER (source_object);
gsize bytes;
bytes = fpi_device_virtual_listener_read_finish (listener, res, &error);
fp_dbg ("Got instructions of length %ld", bytes);
if (error)
{
if (g_error_matches (error, G_IO_ERROR, G_IO_ERROR_CANCELLED))
return;
g_warning ("Error receiving instruction data: %s", error->message);
return;
}
if (bytes > 0)
{
FpDeviceVirtualDevice *self;
g_autofree char *cmd = NULL;
self = FP_DEVICE_VIRTUAL_DEVICE (user_data);
cmd = g_strndup (self->recv_buf, bytes);
fp_dbg ("Received command %s", cmd);
if (g_str_has_prefix (cmd, LIST_CMD))
{
if (self->prints_storage)
g_hash_table_foreach (self->prints_storage, write_key_to_listener, listener);
}
else if (g_str_has_prefix (cmd, UNPLUG_CMD))
{
fpi_device_remove (FP_DEVICE (self));
}
else if (g_str_has_prefix (cmd, SET_ENROLL_STAGES_PREFIX))
{
guint stages;
stages = g_ascii_strtoull (cmd + strlen (SET_ENROLL_STAGES_PREFIX), NULL, 10);
fpi_device_set_nr_enroll_stages (FP_DEVICE (self), stages);
}
else if (g_str_has_prefix (cmd, SET_SCAN_TYPE_PREFIX))
{
const char *scan_type = cmd + strlen (SET_SCAN_TYPE_PREFIX);
g_autoptr(GEnumClass) scan_types = g_type_class_ref (fp_scan_type_get_type ());
GEnumValue *value = g_enum_get_value_by_nick (scan_types, scan_type);
if (value)
fpi_device_set_scan_type (FP_DEVICE (self), value->value);
else
g_warning ("Scan type '%s' not found", scan_type);
}
else if (g_str_has_prefix (cmd, SET_CANCELLATION_PREFIX))
{
self->supports_cancellation = g_ascii_strtoull (
cmd + strlen (SET_CANCELLATION_PREFIX), NULL, 10) != 0;
g_debug ("Cancellation support toggled: %d",
self->supports_cancellation);
}
else if (g_str_has_prefix (cmd, SET_KEEP_ALIVE_PREFIX))
{
self->keep_alive = g_ascii_strtoull (
cmd + strlen (SET_KEEP_ALIVE_PREFIX), NULL, 10) != 0;
g_debug ("Keep alive toggled: %d", self->keep_alive);
}
else
{
g_ptr_array_add (self->pending_commands, g_steal_pointer (&cmd));
g_clear_handle_id (&self->wait_command_id, g_source_remove);
maybe_continue_current_action (self);
}
}
fpi_device_virtual_listener_connection_close (listener);
}
static void
recv_instruction (FpDeviceVirtualDevice *self)
{
fpi_device_virtual_listener_read (self->listener,
FALSE,
self->recv_buf,
sizeof (self->recv_buf),
recv_instruction_cb,
self);
}
static void
on_listener_connected (FpiDeviceVirtualListener *listener,
gpointer user_data)
{
FpDeviceVirtualDevice *self = FP_DEVICE_VIRTUAL_DEVICE (user_data);
recv_instruction (self);
}
static void
dev_init (FpDevice *dev)
{
g_autoptr(GError) error = NULL;
g_autoptr(GCancellable) cancellable = NULL;
g_autoptr(FpiDeviceVirtualListener) listener = NULL;
FpDeviceVirtualDevice *self = FP_DEVICE_VIRTUAL_DEVICE (dev);
G_DEBUG_HERE ();
process_cmds (self, FALSE, &error);
if (error && !g_error_matches (error, G_IO_ERROR, G_IO_ERROR_NOT_FOUND))
{
fpi_device_open_complete (dev, g_steal_pointer (&error));
return;
}
else if (self->sleep_timeout_id)
{
return;
}
else if (self->listener)
{
fpi_device_open_complete (dev, NULL);
return;
}
listener = fpi_device_virtual_listener_new ();
cancellable = g_cancellable_new ();
if (!fpi_device_virtual_listener_start (listener,
fpi_device_get_virtual_env (FP_DEVICE (self)),
cancellable,
on_listener_connected,
self,
&error))
{
fpi_device_open_complete (dev, g_steal_pointer (&error));
return;
}
self->listener = g_steal_pointer (&listener);
self->cancellable = g_steal_pointer (&cancellable);
fpi_device_open_complete (dev, NULL);
}
static gboolean
wait_for_command_timeout (gpointer data)
{
FpDeviceVirtualDevice *self = FP_DEVICE_VIRTUAL_DEVICE (data);
GError *error = NULL;
self->wait_command_id = 0;
switch (fpi_device_get_current_action (FP_DEVICE (self)))
{
case FPI_DEVICE_ACTION_LIST:
case FPI_DEVICE_ACTION_DELETE:
self->ignore_wait = TRUE;
maybe_continue_current_action (self);
self->ignore_wait = FALSE;
return FALSE;
default:
break;
}
error = g_error_new (G_IO_ERROR, G_IO_ERROR_TIMED_OUT, "No commands arrived in time to run!");
fpi_device_action_error (FP_DEVICE (self), error);
return FALSE;
}
gboolean
should_wait_for_command (FpDeviceVirtualDevice *self,
GError *error)
{
if (!error && self->sleep_timeout_id)
return TRUE;
if (self->ignore_wait)
return FALSE;
if (!g_error_matches (error, G_IO_ERROR, G_IO_ERROR_NOT_FOUND))
return FALSE;
if (self->wait_command_id)
return FALSE;
self->wait_command_id = g_timeout_add (500, wait_for_command_timeout, self);
return TRUE;
}
char *
start_scan_command (FpDeviceVirtualDevice *self,
GError **error)
{
g_autoptr(GError) local_error = NULL;
g_autofree char *scan_id = NULL;
if (fp_device_get_finger_status (FP_DEVICE (self)) == FP_FINGER_STATUS_NONE)
self->injected_synthetic_cmd = FALSE;
scan_id = process_cmds (self, TRUE, &local_error);
if (!self->sleep_timeout_id)
{
fpi_device_report_finger_status_changes (FP_DEVICE (self),
FP_FINGER_STATUS_NEEDED,
FP_FINGER_STATUS_NONE);
}
if (should_wait_for_command (self, local_error))
{
g_assert (!scan_id);
g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_PENDING,
"Still waiting for command");
return NULL;
}
if (local_error)
g_propagate_error (error, g_steal_pointer (&local_error));
else
fpi_device_report_finger_status_changes (FP_DEVICE (self),
FP_FINGER_STATUS_PRESENT,
FP_FINGER_STATUS_NONE);
return g_steal_pointer (&scan_id);
}
gboolean
should_wait_to_sleep (FpDeviceVirtualDevice *self,
const char *scan_id,
GError *error)
{
const gchar *cmd;
if (self->sleep_timeout_id)
return TRUE;
if (!self->pending_commands->len)
return FALSE;
cmd = g_ptr_array_index (self->pending_commands, 0);
if (g_str_has_prefix (cmd, SLEEP_CMD_PREFIX))
{
g_autoptr(GError) local_error = NULL;
g_free (process_cmds (self, FALSE, &local_error));
if (g_error_matches (error, G_IO_ERROR, G_IO_ERROR_CANCELLED))
return FALSE;
g_assert (!self->injected_synthetic_cmd);
g_assert (self->sleep_timeout_id != 0);
if (!self->pending_commands->len)
{
g_autofree char *injected_cmd = NULL;
if (scan_id)
injected_cmd = g_strconcat (SCAN_CMD_PREFIX, scan_id, NULL);
else if (error && error->domain == FP_DEVICE_ERROR)
injected_cmd = g_strdup_printf (ERROR_CMD_PREFIX " %d", error->code);
else if (error && error->domain == FP_DEVICE_RETRY)
injected_cmd = g_strdup_printf (RETRY_CMD_PREFIX " %d", error->code);
else
return TRUE;
g_debug ("Sleeping now, command queued for later: %s", injected_cmd);
g_ptr_array_insert (self->pending_commands, 0, g_steal_pointer (&injected_cmd));
self->injected_synthetic_cmd = TRUE;
}
}
return self->sleep_timeout_id != 0;
}
static void
dev_verify (FpDevice *dev)
{
g_autoptr(GError) error = NULL;
FpDeviceVirtualDevice *self = FP_DEVICE_VIRTUAL_DEVICE (dev);
g_autofree char *scan_id = NULL;
scan_id = start_scan_command (self, &error);
if (g_error_matches (error, G_IO_ERROR, G_IO_ERROR_PENDING))
return;
if (scan_id)
{
GVariant *data = NULL;
FpPrint *new_scan;
FpPrint *print;
gboolean success;
g_debug ("Virtual device scanned print %s", scan_id);
fpi_device_get_verify_data (dev, &print);
new_scan = fp_print_new (dev);
fpi_print_set_type (new_scan, FPI_PRINT_RAW);
if (self->prints_storage)
fpi_print_set_device_stored (new_scan, TRUE);
data = g_variant_new_string (scan_id);
g_object_set (new_scan, "fpi-data", data, NULL);
if (self->prints_storage && !g_hash_table_contains (self->prints_storage, scan_id))
{
error = fpi_device_error_new (FP_DEVICE_ERROR_DATA_NOT_FOUND);
success = FALSE;
}
else
{
success = fp_print_equal (print, new_scan);
}
if (!self->match_reported)
{
self->match_reported = TRUE;
fpi_device_verify_report (dev,
success ? FPI_MATCH_SUCCESS : FPI_MATCH_FAIL,
new_scan,
NULL);
}
}
else if (error)
{
g_debug ("Virtual device scan failed with error: %s", error->message);
}
fpi_device_report_finger_status_changes (FP_DEVICE (self),
FP_FINGER_STATUS_NONE,
FP_FINGER_STATUS_PRESENT);
if (error && error->domain == FP_DEVICE_RETRY)
fpi_device_verify_report (dev, FPI_MATCH_ERROR, NULL, g_steal_pointer (&error));
if (should_wait_to_sleep (self, scan_id, error))
return;
self->match_reported = FALSE;
fpi_device_verify_complete (dev, g_steal_pointer (&error));
}
static void
dev_enroll (FpDevice *dev)
{
g_autoptr(GError) error = NULL;
FpDeviceVirtualDevice *self = FP_DEVICE_VIRTUAL_DEVICE (dev);
FpPrint *print = NULL;
g_autofree char *id = NULL;
id = start_scan_command (self, &error);
if (g_error_matches (error, G_IO_ERROR, G_IO_ERROR_PENDING))
return;
fpi_device_get_enroll_data (dev, &print);
if (id)
{
GVariant *data;
gboolean completed;
if (self->prints_storage && g_hash_table_contains (self->prints_storage, id))
{
if (should_wait_to_sleep (self, id, error))
return;
fpi_device_enroll_complete (dev, NULL,
fpi_device_error_new (FP_DEVICE_ERROR_DATA_DUPLICATE));
return;
}
if (self->enroll_stages_passed == 0)
{
fpi_print_set_type (print, FPI_PRINT_RAW);
data = g_variant_new_string (id);
g_object_set (print, "fpi-data", data, NULL);
}
else
{
gboolean changed;
g_object_get (print, "fpi-data", &data, NULL);
changed = !g_str_equal (id, g_variant_get_string (data, NULL));
g_variant_unref (data);
if (changed)
{
g_set_error (&error, FP_DEVICE_RETRY, FP_DEVICE_RETRY_GENERAL, "ID Mismatch");
fpi_device_enroll_progress (dev, self->enroll_stages_passed, NULL,
g_steal_pointer (&error));
if (!should_wait_to_sleep (self, id, error))
self->sleep_timeout_id = g_idle_add (sleep_timeout_cb, self);
return;
}
}
self->enroll_stages_passed++;
completed = self->enroll_stages_passed == fp_device_get_nr_enroll_stages (FP_DEVICE (self));
fpi_device_report_finger_status_changes (FP_DEVICE (self),
completed ?
FP_FINGER_STATUS_NEEDED :
FP_FINGER_STATUS_NONE,
FP_FINGER_STATUS_PRESENT);
fpi_device_enroll_progress (dev, self->enroll_stages_passed, print, NULL);
if (completed)
{
if (self->prints_storage)
{
fpi_print_set_device_stored (print, TRUE);
g_hash_table_add (self->prints_storage, g_strdup (id));
}
fpi_device_enroll_complete (dev, g_object_ref (print), NULL);
self->enroll_stages_passed = 0;
}
else if (!should_wait_to_sleep (self, id, error))
{
self->sleep_timeout_id = g_idle_add (sleep_timeout_cb, self);
}
}
else
{
fpi_device_report_finger_status_changes (FP_DEVICE (self),
FP_FINGER_STATUS_NONE,
FP_FINGER_STATUS_PRESENT);
if (error && error->domain == FP_DEVICE_RETRY)
{
fpi_device_enroll_progress (dev, self->enroll_stages_passed, NULL, g_steal_pointer (&error));
if (!should_wait_to_sleep (self, id, error))
self->sleep_timeout_id = g_idle_add (sleep_timeout_cb, self);
}
else
{
if (should_wait_to_sleep (self, id, error))
return;
self->enroll_stages_passed = 0;
fpi_device_enroll_complete (dev, NULL, g_steal_pointer (&error));
}
}
}
static void
dev_cancel (FpDevice *dev)
{
FpDeviceVirtualDevice *self = FP_DEVICE_VIRTUAL_DEVICE (dev);
if (self->injected_synthetic_cmd)
{
self->injected_synthetic_cmd = FALSE;
g_ptr_array_remove_index (self->pending_commands, 0);
}
if (!self->supports_cancellation)
return;
g_debug ("Got cancellation!");
g_clear_handle_id (&self->sleep_timeout_id, g_source_remove);
maybe_continue_current_action (self);
}
static void
stop_listener (FpDeviceVirtualDevice *self)
{
g_cancellable_cancel (self->cancellable);
g_clear_object (&self->cancellable);
g_clear_object (&self->listener);
}
static void
dev_deinit (FpDevice *dev)
{
g_autoptr(GError) error = NULL;
FpDeviceVirtualDevice *self = FP_DEVICE_VIRTUAL_DEVICE (dev);
process_cmds (self, FALSE, &error);
if (error && !g_error_matches (error, G_IO_ERROR, G_IO_ERROR_NOT_FOUND))
{
fpi_device_close_complete (dev, g_steal_pointer (&error));
return;
}
else if (self->sleep_timeout_id)
{
return;
}
g_clear_handle_id (&self->wait_command_id, g_source_remove);
g_clear_handle_id (&self->sleep_timeout_id, g_source_remove);
if (!self->keep_alive)
stop_listener (self);
fpi_device_close_complete (dev, NULL);
}
static void
fpi_device_virtual_device_finalize (GObject *object)
{
FpDeviceVirtualDevice *self = FP_DEVICE_VIRTUAL_DEVICE (object);
G_DEBUG_HERE ();
stop_listener (self);
g_clear_pointer (&self->pending_commands, g_ptr_array_unref);
G_OBJECT_CLASS (fpi_device_virtual_device_parent_class)->finalize (object);
}
static void
fpi_device_virtual_device_init (FpDeviceVirtualDevice *self)
{
self->supports_cancellation = TRUE;
self->pending_commands = g_ptr_array_new_with_free_func (g_free);
}
static const FpIdEntry driver_ids[] = {
{ .virtual_envvar = "FP_VIRTUAL_DEVICE", },
{ .virtual_envvar = NULL }
};
static void
fpi_device_virtual_device_class_init (FpDeviceVirtualDeviceClass *klass)
{
FpDeviceClass *dev_class = FP_DEVICE_CLASS (klass);
GObjectClass *object_class = G_OBJECT_CLASS (klass);
object_class->finalize = fpi_device_virtual_device_finalize;
dev_class->id = FP_COMPONENT;
dev_class->full_name = "Virtual device for debugging";
dev_class->type = FP_DEVICE_TYPE_VIRTUAL;
dev_class->id_table = driver_ids;
dev_class->nr_enroll_stages = 5;
dev_class->open = dev_init;
dev_class->close = dev_deinit;
dev_class->verify = dev_verify;
dev_class->enroll = dev_enroll;
dev_class->cancel = dev_cancel;
fpi_device_class_auto_initialize_features (dev_class);
}
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