lib: Generate driver IDs, instead of hard-coding them

Instead of adding driver IDs by hand to a header file, generate the
driver ID from the (hopefully unique) name of the driver.

This means one file less for driver authors to modify, and one possible
source of merge conflicts less as well.

However, this means that already enrolled fingerprints will need to be
enrolled again, as the driver IDs will have changed compared to their
old on-disk value.

doc/advanced-topics.xml

@@ -71,10 +71,7 @@
     <title>Driver IDs</title>
 
     <para>
-    Each driver is assigned a unique ID by the project maintainer. These
-    assignments are
-    <ulink url="https://gitlab.freedesktop.org/libfprint/libfprint/blob/master/libfprint/drivers/driver_ids.h">
-    documented in the sources</ulink> and will never change.
+    Each driver is assigned a unique ID automatically based on the driver name.
     </para>
 
     <para>

doc/meson.build

@@ -17,7 +17,6 @@ private_headers = [
   'aes2660.h',
   'aes3k.h',
   'aesx660.h',
-  'driver_ids.h',
   'elan.h',
   'upek_proto.h',
   'upeksonly.h',

libfprint/drivers/aes1610.c

@@ -817,7 +817,6 @@ static const struct usb_id id_table[] = {
 
 struct fp_img_driver aes1610_driver = {
 	.driver = {
-		.id = AES1610_ID,
 		.name = FP_COMPONENT,
 		.full_name = "AuthenTec AES1610",
 		.id_table = id_table,

libfprint/drivers/aes1660.c

@@ -94,7 +94,6 @@ static const struct usb_id id_table[] = {
 
 struct fp_img_driver aes1660_driver = {
 	.driver = {
-		.id = AES1660_ID,
 		.name = FP_COMPONENT,
 		.full_name = "AuthenTec AES1660",
 		.id_table = id_table,

libfprint/drivers/aes2501.c

@@ -859,7 +859,6 @@ static const struct usb_id id_table[] = {
 
 struct fp_img_driver aes2501_driver = {
 	.driver = {
-		.id = AES2501_ID,
 		.name = FP_COMPONENT,
 		.full_name = "AuthenTec AES2501",
 		.id_table = id_table,

libfprint/drivers/aes2550.c

@@ -603,7 +603,6 @@ static const struct usb_id id_table[] = {
 
 struct fp_img_driver aes2550_driver = {
 	.driver = {
-		.id = AES2550_ID,
 		.name = FP_COMPONENT,
 		.full_name = "AuthenTec AES2550/AES2810",
 		.id_table = id_table,

libfprint/drivers/aes2660.c

@@ -97,7 +97,6 @@ static const struct usb_id id_table[] = {
 
 struct fp_img_driver aes2660_driver = {
 	.driver = {
-		.id = AES2660_ID,
 		.name = FP_COMPONENT,
 		.full_name = "AuthenTec AES2660",
 		.id_table = id_table,

libfprint/drivers/aes3500.c

@@ -162,7 +162,6 @@ static const struct usb_id id_table[] = {
 
 struct fp_img_driver aes3500_driver = {
 	.driver = {
-		.id = AES3500_ID,
 		.name = FP_COMPONENT,
 		.full_name = "AuthenTec AES3500",
 		.id_table = id_table,

libfprint/drivers/aes4000.c

@@ -159,7 +159,6 @@ static const struct usb_id id_table[] = {
 
 struct fp_img_driver aes4000_driver = {
 	.driver = {
-		.id = AES4000_ID,
 		.name = FP_COMPONENT,
 		.full_name = "AuthenTec AES4000",
 		.id_table = id_table,

libfprint/drivers/driver_ids.h

@@ -1,47 +0,0 @@
-/*
- * Driver IDs
- * Copyright (C) 2012 Vasily Khoruzhick <anarsoul@gmail.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
- */
-
-#ifndef __DRIVER_IDS
-#define __DRIVER_IDS
-
-enum {
-	UPEKTS_ID	= 1,
-	URU4000_ID	= 2,
-	AES4000_ID	= 3,
-	AES2501_ID	= 4,
-	UPEKTC_ID	= 5,
-	AES1610_ID	= 6,
-	FDU2000_ID	= 7,
-	VCOM5S_ID	= 8,
-	UPEKSONLY_ID	= 9,
-	VFS101_ID	= 10,
-	VFS301_ID	= 11,
-	AES2550_ID	= 12,
-	/* UPEKE2_ID = 13 */
-	AES1660_ID	= 14,
-	AES2660_ID	= 15,
-	AES3500_ID	= 16,
-	UPEKTC_IMG_ID	= 17,
-	ETES603_ID	= 18,
-	VFS5011_ID	= 19,
-	VFS0050_ID	= 20,
-	ELAN_ID		= 21,
-};
-
-#endif

libfprint/drivers/elan.c

@@ -970,7 +970,6 @@ static void dev_deactivate(struct fp_img_dev *dev)
 
 struct fp_img_driver elan_driver = {
 	.driver = {
-		   .id = ELAN_ID,
 		   .name = FP_COMPONENT,
 		   .full_name = "ElanTech Fingerprint Sensor",
 		   .id_table = elan_id_table,

libfprint/drivers/etes603.c

@@ -36,7 +36,6 @@
 #define FP_COMPONENT "etes603"
 
 #include "drivers_api.h"
-#include "driver_ids.h"
 
 /* libusb defines */
 #define EP_IN              0x81
@@ -1478,7 +1477,6 @@ static const struct usb_id id_table[] = {
 
 struct fp_img_driver etes603_driver = {
 	.driver = {
-		.id = ETES603_ID,
 		.name = FP_COMPONENT,
 		.full_name = "EgisTec ES603",
 		.id_table = id_table,

libfprint/drivers/fdu2000.c

@@ -302,7 +302,6 @@ static const struct usb_id id_table[] = {
 
 struct fp_img_driver fdu2000_driver = {
 	.driver = {
-		.id = FDU2000_ID,
 		.name = FP_COMPONENT,
 		.full_name = "Secugen FDU 2000",
 		.id_table = id_table,

libfprint/drivers/upeksonly.c

@@ -1345,7 +1345,6 @@ static const struct usb_id id_table[] = {
 
 struct fp_img_driver upeksonly_driver = {
 	.driver = {
-		.id = UPEKSONLY_ID,
 		.name = FP_COMPONENT,
 		.full_name = "UPEK TouchStrip Sensor-Only",
 		.id_table = id_table,

libfprint/drivers/upektc.c

@@ -460,7 +460,6 @@ static const struct usb_id id_table[] = {
 
 struct fp_img_driver upektc_driver = {
 	.driver = {
-		.id = UPEKTC_ID,
 		.name = FP_COMPONENT,
 		.full_name = "UPEK TouchChip/Eikon Touch 300",
 		.id_table = id_table,

libfprint/drivers/upektc_img.c

@@ -628,7 +628,6 @@ static const struct usb_id id_table[] = {
 
 struct fp_img_driver upektc_img_driver = {
 	.driver = {
-		.id = UPEKTC_IMG_ID,
 		.name = FP_COMPONENT,
 		.full_name = "Upek TouchChip Fingerprint Coprocessor",
 		.id_table = id_table,

libfprint/drivers/upekts.c

@@ -1421,7 +1421,6 @@ static const struct usb_id id_table[] = {
 };
 
 struct fp_driver upekts_driver = {
-	.id = UPEKTS_ID,
 	.name = FP_COMPONENT,
 	.full_name = "UPEK TouchStrip",
 	.id_table = id_table,

libfprint/drivers/uru4000.c

@@ -1428,7 +1428,6 @@ static const struct usb_id id_table[] = {
 
 struct fp_img_driver uru4000_driver = {
 	.driver = {
-		.id = URU4000_ID,
 		.name = FP_COMPONENT,
 		.full_name = "Digital Persona U.are.U 4000/4000B/4500",
 		.id_table = id_table,

libfprint/drivers/vcom5s.c

@@ -357,7 +357,6 @@ static const struct usb_id id_table[] = {
 
 struct fp_img_driver vcom5s_driver = {
 	.driver = {
-		.id = VCOM5S_ID,
 		.name = FP_COMPONENT,
 		.full_name = "Veridicom 5thSense",
 		.id_table = id_table,

libfprint/drivers/vfs0050.c

@@ -770,7 +770,6 @@ static const struct usb_id id_table[] = {
 struct fp_img_driver vfs0050_driver = {
 	/* Driver specification */
 	.driver = {
-		   .id = VFS0050_ID,
 		   .name = FP_COMPONENT,
 		   .full_name = "Validity VFS0050",
 		   .id_table = id_table,

libfprint/drivers/vfs101.c

@@ -1526,7 +1526,6 @@ struct fp_img_driver vfs101_driver =
 	/* Driver specification */
 	.driver =
 	{
-		.id = VFS101_ID,
 		.name = FP_COMPONENT,
 		.full_name = "Validity VFS101",
 		.id_table = id_table,

libfprint/drivers/vfs301.c

@@ -268,7 +268,6 @@ struct fp_img_driver vfs301_driver =
 	/* Driver specification */
 	.driver =
 	{
-		.id = VFS301_ID,
 		.name = FP_COMPONENT,
 		.full_name = "Validity VFS301",
 		.id_table = id_table,

libfprint/drivers/vfs5011.c

@@ -887,7 +887,6 @@ static const struct usb_id id_table[] = {
 
 struct fp_img_driver vfs5011_driver = {
 	.driver = {
-		.id = VFS5011_ID,
 		.name = "vfs5011",
 		.full_name = "Validity VFS5011",
 		.id_table = id_table,

libfprint/drivers_api.h

@@ -34,6 +34,5 @@
 #include "fpi-usb.h"
 #include "fpi-img.h"
 #include "fpi-assembling.h"
-#include "drivers/driver_ids.h"
 
 #endif

libfprint/fp_internal.h

@@ -35,7 +35,6 @@
 #include "fpi-dev-img.h"
 #include "fpi-data.h"
 #include "fpi-img.h"
-#include "drivers/driver_ids.h"
 
 /* Global variables */
 extern libusb_context *fpi_usb_ctx;
@@ -145,8 +144,6 @@ struct fp_img_dev {
 	size_t identify_match_offset;
 };
 
-/* fp_driver structure definition */
-
 /* fp_img_driver structure definition */
 #define container_of(ptr, type, member) ({                      \
         const typeof( ((type *)0)->member ) *__mptr = (ptr);    \

libfprint/fpi-core.c

@@ -137,10 +137,13 @@ GSList *opened_devices = NULL;
 
 static GSList *registered_drivers = NULL;
 
+#define DRV_ID(drv) g_str_hash(drv->name)
+
 static void register_driver(struct fp_driver *drv)
 {
-	if (drv->id == 0) {
-		fp_err("not registering driver %s: driver ID is 0", drv->name);
+	if (drv->name == NULL ||
+	    strlen(drv->name) <= 2) {
+		fp_err("not registering driver %s, name is too short or absent", drv->name);
 		return;
 	}
 	registered_drivers = g_slist_prepend(registered_drivers, (gpointer) drv);
@@ -411,7 +414,7 @@ API_EXPORTED int fp_dscv_dev_supports_print_data(struct fp_dscv_dev *dev,
 	g_return_val_if_fail(dev, 0);
 	g_return_val_if_fail(print, 0);
 
-	return fpi_print_data_compatible(dev->drv->id, dev->devtype,
+	return fpi_print_data_compatible(DRV_ID(dev->drv), dev->devtype,
 		fpi_driver_get_data_type(dev->drv), print->driver_id, print->devtype,
 		print->type);
 }
@@ -434,7 +437,7 @@ API_EXPORTED int fp_dscv_dev_supports_dscv_print(struct fp_dscv_dev *dev,
 	g_return_val_if_fail(dev, 0);
 	g_return_val_if_fail(print, 0);
 
-	return fpi_print_data_compatible(dev->drv->id, dev->devtype, 0,
+	return fpi_print_data_compatible(DRV_ID(dev->drv), dev->devtype, 0,
 		print->driver_id, print->devtype, 0);
 }
 
@@ -559,7 +562,7 @@ API_EXPORTED int fp_dev_supports_print_data(struct fp_dev *dev,
 	g_return_val_if_fail(dev, 0);
 	g_return_val_if_fail(data, 0);
 
-	return fpi_print_data_compatible(dev->drv->id, dev->devtype,
+	return fpi_print_data_compatible(DRV_ID(dev->drv), dev->devtype,
 		fpi_driver_get_data_type(dev->drv), data->driver_id, data->devtype,
 		data->type);
 }
@@ -582,7 +585,7 @@ API_EXPORTED int fp_dev_supports_dscv_print(struct fp_dev *dev,
 	g_return_val_if_fail(dev, 0);
 	g_return_val_if_fail(print, 0);
 
-	return fpi_print_data_compatible(dev->drv->id, dev->devtype,
+	return fpi_print_data_compatible(DRV_ID(dev->drv), dev->devtype,
 		0, print->driver_id, print->devtype, 0);
 }
 
@@ -628,7 +631,7 @@ API_EXPORTED uint16_t fp_driver_get_driver_id(struct fp_driver *drv)
 {
 	g_return_val_if_fail(drv, 0);
 
-	return drv->id;
+	return DRV_ID(drv);
 }
 
 /**

libfprint/fpi-core.h

@@ -68,7 +68,6 @@ enum fp_driver_type {
 };
 
 struct fp_driver {
-	const uint16_t id;
 	const char *name;
 	const char *full_name;
 	const struct usb_id * const id_table;

libfprint/fpi-data.c

@@ -148,7 +148,7 @@ struct fp_print_data_item *fpi_print_data_item_new(size_t length)
 
 struct fp_print_data *fpi_print_data_new(struct fp_dev *dev)
 {
-	return print_data_new(dev->drv->id, dev->devtype,
+	return print_data_new(fp_driver_get_driver_id(dev->drv), dev->devtype,
 		fpi_driver_get_data_type(dev->drv));
 }
 
@@ -349,7 +349,7 @@ static char *__get_path_to_print(uint16_t driver_id, uint32_t devtype,
 
 static char *get_path_to_print(struct fp_dev *dev, enum fp_finger finger)
 {
-	return __get_path_to_print(dev->drv->id, dev->devtype, finger);
+	return __get_path_to_print(fp_driver_get_driver_id(dev->drv), dev->devtype, finger);
 }
 
 /**