tests: Ensure that we don't break ABI with expected TODv1 structures

We can check whether each relevant structure element has not changed and
that the supported enum and flag values didn't change value.

tests/tod-drivers/base-fp-device.h

@@ -0,0 +1,51 @@
+/*
+ * FpDevice - A fingerprint reader device
+ * Copyright (C) 2021 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
+ */
+
+#pragma once
+
+typedef struct _FpDevice FpDevice;
+
+typedef enum {
+  FP_DEVICE_TYPE_TODV1_VIRTUAL,
+  FP_DEVICE_TYPE_TODV1_USB,
+} FpDeviceTypeTODV1;
+
+typedef enum {
+  FP_SCAN_TYPE_TODV1_SWIPE,
+  FP_SCAN_TYPE_TODV1_PRESS,
+} FpScanTypeTODV1;
+
+typedef enum {
+  FP_DEVICE_RETRY_TODV1_GENERAL,
+  FP_DEVICE_RETRY_TODV1_TOO_SHORT,
+  FP_DEVICE_RETRY_TODV1_CENTER_FINGER,
+  FP_DEVICE_RETRY_TODV1_REMOVE_FINGER,
+} FpDeviceRetryTODV1;
+
+typedef enum {
+  FP_DEVICE_ERROR_TODV1_GENERAL,
+  FP_DEVICE_ERROR_TODV1_NOT_SUPPORTED,
+  FP_DEVICE_ERROR_TODV1_NOT_OPEN,
+  FP_DEVICE_ERROR_TODV1_ALREADY_OPEN,
+  FP_DEVICE_ERROR_TODV1_BUSY,
+  FP_DEVICE_ERROR_TODV1_PROTO,
+  FP_DEVICE_ERROR_TODV1_DATA_INVALID,
+  FP_DEVICE_ERROR_TODV1_DATA_NOT_FOUND,
+  FP_DEVICE_ERROR_TODV1_DATA_FULL,
+} FpDeviceErrorTODV1;