list-udev-rules: Add udev rule generation for SPI

libfprint/fprint-list-udev-rules.c

@@ -0,0 +1,93 @@
+/*
+ * Copyright (C) 2009 Red Hat <mjg@redhat.com>
+ * Copyright (C) 2008 Bastien Nocera <hadess@hadess.net>
+ * Copyright (C) 2008 Timo Hoenig <thoenig@suse.de>, <thoenig@nouse.net>
+ * Coypright (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
+ */
+
+#include <config.h>
+
+#include "fpi-context.h"
+#include "fpi-device.h"
+
+GHashTable *printed = NULL;
+
+static void
+print_driver (const FpDeviceClass *cls)
+{
+  const FpIdEntry *entry;
+  gint num_printed = 0;
+
+  if (cls->type != FP_DEVICE_TYPE_UDEV)
+    return;
+
+  for (entry = cls->id_table; entry->udev_types != 0; entry++)
+    {
+      /* We only add rules for spidev right now. */
+      if ((entry->udev_types & FPI_DEVICE_UDEV_SUBTYPE_SPIDEV) == 0)
+        continue;
+
+      if (g_hash_table_lookup (printed, entry->spi_acpi_id) != NULL)
+        continue;
+
+      g_hash_table_insert (printed, g_strdup (entry->spi_acpi_id), GINT_TO_POINTER (1));
+
+      if (num_printed == 0)
+        g_print ("# %s\n", cls->full_name);
+
+      g_print ("ACTION==\"add|change\", SUBSYSTEM==\"spi\", ENV{MODALIAS}==\"acpi:%s:\", RUN{builtin}+=\"kmod load spi:spidev\", RUN+=\"/bin/sh -c 'echo spidev > %%S%%p/driver_override && echo %%k > %%S%%p/subsystem/drivers/spidev/bind'\"\n",
+               entry->spi_acpi_id);
+      num_printed++;
+    }
+
+  if (num_printed > 0)
+    g_print ("\n");
+}
+
+int
+main (int argc, char **argv)
+{
+  g_autoptr(GArray) drivers = fpi_get_driver_types ();
+  guint i;
+
+  printed = g_hash_table_new_full (g_str_hash, g_str_equal, g_free, NULL);
+
+  g_print ("# This file is part of libfprint\n");
+  g_print ("# Do not modify this file, it will get overwritten on updates.\n");
+  g_print ("# To override or extend the rules place a file in /etc/udev/rules.d\n");
+  g_print ("\n");
+
+  for (i = 0; i < drivers->len; i++)
+    {
+      GType driver = g_array_index (drivers, GType, i);
+      FpDeviceClass *cls = FP_DEVICE_CLASS (g_type_class_ref (driver));
+
+      if (cls->type != FP_DEVICE_TYPE_UDEV)
+        {
+          g_type_class_unref (cls);
+          continue;
+        }
+
+      print_driver (cls);
+
+      g_type_class_unref (cls);
+    }
+
+  g_hash_table_destroy (printed);
+
+  return 0;
+}

libfprint/meson.build

@@ -329,6 +329,23 @@ udev_hwdb_generator = custom_target('udev-hwdb',
     install: false,
 )
 
+if udev_rules
+    udev_rules = executable('fprint-list-udev-rules',
+        'fprint-list-udev-rules.c',
+        dependencies: libfprint_private_dep,
+        link_with: libfprint_drivers,
+        install: false)
+
+    custom_target('udev-rules',
+        output: '70-@0@.rules'.format(versioned_libname),
+        depend_files: drivers_sources,
+        capture: true,
+        command: [ udev_rules ],
+        install: true,
+        install_dir: udev_rules_dir,
+    )
+endif
+
 custom_target('sync-udev-hwdb',
     depends: udev_hwdb_generator,
     output: 'sync-udev-hwdb',

meson.build

@@ -164,6 +164,9 @@ nss_dep = dependency('', required: false)
 imaging_dep = dependency('', required: false)
 gudev_dep = dependency('', required: false)
 libfprint_conf.set10('HAVE_PIXMAN', false)
+
+udev_rules = false
+
 foreach driver: drivers
     if driver == 'uru4000'
         nss_dep = dependency('nss', required: false)
@@ -180,6 +183,8 @@ foreach driver: drivers
         libfprint_conf.set10('HAVE_PIXMAN', true)
     endif
         if udev_drivers.contains(driver)
+            udev_rules = true
+
             gudev_dep = dependency('gudev-1.0', required: false)
             if not gudev_dep.found()
                 error('udev is required for SPI support')
@@ -192,6 +197,14 @@ foreach driver: drivers
     endif
 endforeach
 
+if udev_rules
+    udev_rules_dir = get_option('udev_rules_dir')
+    if udev_rules_dir == 'auto'
+        udev_dep = dependency('udev')
+        udev_rules_dir = udev_dep.get_pkgconfig_variable('udevdir') + '/hwdb.d'
+    endif
+endif
+
 supported_drivers = []
 foreach driver: drivers
     if build_machine.endian() == 'little' or driver in endian_independent_drivers

meson_options.txt

@@ -6,8 +6,12 @@ option('introspection',
        description: 'Build GObject Introspection repository',
        type: 'boolean',
        value: true)
+option('udev_rules_dir',
+       description: 'Installation path for udev rules',
+       type: 'string',
+       value: 'auto')
 option('udev_hwdb',
-       description: 'Whether to create a udev hwdb',
+       description: 'Whether to create a udev hwdb for autosuspend (included in systemd v248 and later)',
        type: 'feature',
        value: 'auto')
 option('udev_hwdb_dir',