/* * Copyright (C) 2018 Red Hat * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as * published by the Free Software Foundation; either version 2 of the * License, or (at your option) any later version. * * This program 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 * General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA * 02111-1307, USA. * */ #include "config.h" #include "backends/native/meta-udev.h" #include "backends/native/meta-backend-native.h" #include "backends/native/meta-launcher.h" #define DRM_CARD_UDEV_DEVICE_TYPE "drm_minor" enum { HOTPLUG, DEVICE_ADDED, DEVICE_REMOVED, N_SIGNALS }; static guint signals[N_SIGNALS]; struct _MetaUdev { GObject parent; MetaBackendNative *backend_native; GUdevClient *gudev_client; gulong uevent_handler_id; }; G_DEFINE_TYPE (MetaUdev, meta_udev, G_TYPE_OBJECT) gboolean meta_is_udev_device_platform_device (GUdevDevice *device) { g_autoptr (GUdevDevice) platform_device = NULL; platform_device = g_udev_device_get_parent_with_subsystem (device, "platform", NULL); return !!platform_device; } gboolean meta_is_udev_device_boot_vga (GUdevDevice *device) { g_autoptr (GUdevDevice) pci_device = NULL; pci_device = g_udev_device_get_parent_with_subsystem (device, "pci", NULL); if (!pci_device) return FALSE; return g_udev_device_get_sysfs_attr_as_int (pci_device, "boot_vga") == 1; } gboolean meta_is_udev_device_requires_modifiers (GUdevDevice *device) { g_autoptr (GUdevDevice) platform_device = NULL; const char * const * tags; platform_device = g_udev_device_get_parent_with_subsystem (device, "platform", NULL); if (!platform_device) return FALSE; tags = g_udev_device_get_tags (platform_device); if (!tags) return FALSE; return g_strv_contains (tags, "mutter-device-requires-kms-modifiers"); } gboolean meta_is_udev_device_preferred_primary (GUdevDevice *device) { const char * const * tags; tags = g_udev_device_get_tags (device); if (!tags) return FALSE; return g_strv_contains (tags, "mutter-device-preferred-primary"); } gboolean meta_udev_is_drm_device (MetaUdev *udev, GUdevDevice *device) { MetaLauncher *launcher = meta_backend_native_get_launcher (udev->backend_native); const char *seat_id; const char *device_type; const char *device_seat; /* Filter out devices that are not character device, like card0-VGA-1. */ if (g_udev_device_get_device_type (device) != G_UDEV_DEVICE_TYPE_CHAR) return FALSE; device_type = g_udev_device_get_property (device, "DEVTYPE"); if (g_strcmp0 (device_type, DRM_CARD_UDEV_DEVICE_TYPE) != 0) return FALSE; device_seat = g_udev_device_get_property (device, "ID_SEAT"); if (!device_seat) { /* When ID_SEAT is not set, it means seat0. */ device_seat = "seat0"; } /* Skip devices that do not belong to our seat. */ seat_id = meta_launcher_get_seat_id (launcher); if (g_strcmp0 (seat_id, device_seat)) return FALSE; return TRUE; } GList * meta_udev_list_drm_devices (MetaUdev *udev, GError **error) { g_autoptr (GUdevEnumerator) enumerator = NULL; GList *devices; GList *l; enumerator = g_udev_enumerator_new (udev->gudev_client); g_udev_enumerator_add_match_name (enumerator, "card*"); g_udev_enumerator_add_match_tag (enumerator, "seat"); /* * We need to explicitly match the subsystem for now. * https://bugzilla.gnome.org/show_bug.cgi?id=773224 */ g_udev_enumerator_add_match_subsystem (enumerator, "drm"); devices = g_udev_enumerator_execute (enumerator); if (!devices) { g_set_error (error, G_IO_ERROR, G_IO_ERROR_NOT_FOUND, "No drm devices found"); return FALSE; } for (l = devices; l;) { GUdevDevice *device = l->data; GList *l_next = l->next; if (!meta_udev_is_drm_device (udev, device)) { g_object_unref (device); devices = g_list_delete_link (devices, l); } l = l_next; } if (!devices) { g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED, "No DRM devices found"); return NULL; } return devices; } static void on_uevent (GUdevClient *client, const char *action, GUdevDevice *device, gpointer user_data) { MetaUdev *udev = META_UDEV (user_data); if (!g_udev_device_get_device_file (device)) return; if (g_str_equal (action, "add")) g_signal_emit (udev, signals[DEVICE_ADDED], 0, device); else if (g_str_equal (action, "remove")) g_signal_emit (udev, signals[DEVICE_REMOVED], 0, device); if (g_udev_device_get_property_as_boolean (device, "HOTPLUG")) g_signal_emit (udev, signals[HOTPLUG], 0); } MetaUdev * meta_udev_new (MetaBackendNative *backend_native) { MetaUdev *udev; udev = g_object_new (META_TYPE_UDEV, NULL); udev->backend_native = backend_native; return udev; } static void meta_udev_finalize (GObject *object) { MetaUdev *udev = META_UDEV (object); g_clear_signal_handler (&udev->uevent_handler_id, udev->gudev_client); g_clear_object (&udev->gudev_client); G_OBJECT_CLASS (meta_udev_parent_class)->finalize (object); } static void meta_udev_init (MetaUdev *udev) { const char *subsystems[] = { "drm", NULL }; udev->gudev_client = g_udev_client_new (subsystems); udev->uevent_handler_id = g_signal_connect (udev->gudev_client, "uevent", G_CALLBACK (on_uevent), udev); } static void meta_udev_class_init (MetaUdevClass *klass) { GObjectClass *object_class = G_OBJECT_CLASS (klass); object_class->finalize = meta_udev_finalize; signals[HOTPLUG] = g_signal_new ("hotplug", G_TYPE_FROM_CLASS (object_class), G_SIGNAL_RUN_LAST, 0, NULL, NULL, NULL, G_TYPE_NONE, 0); signals[DEVICE_ADDED] = g_signal_new ("device-added", G_TYPE_FROM_CLASS (object_class), G_SIGNAL_RUN_LAST, 0, NULL, NULL, NULL, G_TYPE_NONE, 1, G_UDEV_TYPE_DEVICE); signals[DEVICE_REMOVED] = g_signal_new ("device-removed", G_TYPE_FROM_CLASS (object_class), G_SIGNAL_RUN_LAST, 0, NULL, NULL, NULL, G_TYPE_NONE, 1, G_UDEV_TYPE_DEVICE); }