suspend: add suspend/resume support with powerd on ChromeOS

ModemManager handles suspend and resume signals sent from powerd

Fixes https://gitlab.freedesktop.org/mobile-broadband/ModemManager/-/issues/547

1 files changed, 265 insertions, 0 deletions

diff --git a/src/mm-sleep-monitor-systemd.c b/src/mm-sleep-monitor-systemd.c
new file mode 100644
index 00000000..a65aac42
--- /dev/null
+++ b/src/mm-sleep-monitor-systemd.c
@@ -0,0 +1,265 @@
+/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* 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.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * (C) Copyright 2012 Red Hat, Inc.
+ * Author: Matthias Clasen <mclasen@redhat.com>
+ */
+
+#include "config.h"
+
+#include <errno.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <glib/gi18n.h>
+#include <gio/gio.h>
+#include <gio/gunixfdlist.h>
+
+#include "mm-log-object.h"
+#include "mm-utils.h"
+#include "mm-sleep-monitor.h"
+
+#define SD_NAME              "org.freedesktop.login1"
+#define SD_PATH              "/org/freedesktop/login1"
+#define SD_INTERFACE         "org.freedesktop.login1.Manager"
+
+struct _MMSleepMonitor {
+    GObject parent_instance;
+
+    GDBusProxy *sd_proxy;
+    gint inhibit_fd;
+};
+
+struct _MMSleepMonitorClass {
+    GObjectClass parent_class;
+
+    void (*sleeping) (MMSleepMonitor *monitor);
+    void (*resuming) (MMSleepMonitor *monitor);
+};
+
+
+enum {
+    SLEEPING,
+    RESUMING,
+    LAST_SIGNAL,
+};
+
+static guint signals[LAST_SIGNAL] = {0};
+
+static void log_object_iface_init (MMLogObjectInterface *iface);
+
+G_DEFINE_TYPE_EXTENDED (MMSleepMonitor, mm_sleep_monitor, G_TYPE_OBJECT, 0,
+                        G_IMPLEMENT_INTERFACE (MM_TYPE_LOG_OBJECT, log_object_iface_init))
+
+/*****************************************************************************/
+
+static gchar *
+log_object_build_id (MMLogObject *_self)
+{
+    return g_strdup ("sleep-monitor-systemd");
+}
+
+/********************************************************************/
+
+static gboolean
+drop_inhibitor (MMSleepMonitor *self)
+{
+    if (self->inhibit_fd >= 0) {
+        mm_obj_dbg (self, "dropping systemd sleep inhibitor");
+        close (self->inhibit_fd);
+        self->inhibit_fd = -1;
+        return TRUE;
+    }
+    return FALSE;
+}
+
+static void
+inhibit_done (GObject      *source,
+              GAsyncResult *result,
+              gpointer      user_data)
+{
+    GDBusProxy *sd_proxy = G_DBUS_PROXY (source);
+    MMSleepMonitor *self = user_data;
+    GError *error = NULL;
+    GVariant *res;
+    GUnixFDList *fd_list;
+
+    res = g_dbus_proxy_call_with_unix_fd_list_finish (sd_proxy, &fd_list, result, &error);
+    if (!res) {
+        mm_obj_warn (self, "inhibit failed: %s", error->message);
+        g_error_free (error);
+    } else {
+        if (!fd_list || g_unix_fd_list_get_length (fd_list) != 1)
+            mm_obj_warn (self, "didn't get a single fd back");
+
+        self->inhibit_fd = g_unix_fd_list_get (fd_list, 0, NULL);
+
+        mm_obj_dbg (self, "inhibitor fd is %d", self->inhibit_fd);
+        g_object_unref (fd_list);
+        g_variant_unref (res);
+    }
+}
+
+static void
+take_inhibitor (MMSleepMonitor *self)
+{
+    g_assert (self->inhibit_fd == -1);
+
+    mm_obj_dbg (self, "taking systemd sleep inhibitor");
+    g_dbus_proxy_call_with_unix_fd_list (self->sd_proxy,
+                                         "Inhibit",
+                                         g_variant_new ("(ssss)",
+                                                        "sleep",
+                                                        "ModemManager",
+                                                        _("ModemManager needs to reset devices"),
+                                                        "delay"),
+                                         0,
+                                         G_MAXINT,
+                                         NULL,
+                                         NULL,
+                                         inhibit_done,
+                                         self);
+}
+
+static void
+signal_cb (GDBusProxy  *proxy,
+           const gchar *sendername,
+           const gchar *signalname,
+           GVariant    *args,
+           gpointer     data)
+{
+    MMSleepMonitor *self = data;
+    gboolean is_about_to_suspend;
+
+    if (strcmp (signalname, "PrepareForSleep") != 0)
+        return;
+
+    g_variant_get (args, "(b)", &is_about_to_suspend);
+
+    if (is_about_to_suspend) {
+        mm_obj_info (self, "system is about to suspend");
+        g_signal_emit (self, signals[SLEEPING], 0);
+        drop_inhibitor (self);
+    } else {
+        mm_obj_info (self, "system is resuming");
+        take_inhibitor (self);
+        g_signal_emit (self, signals[RESUMING], 0);
+    }
+}
+
+static void
+name_owner_cb (GObject    *object,
+               GParamSpec *pspec,
+               gpointer    user_data)
+{
+    GDBusProxy *proxy = G_DBUS_PROXY (object);
+    MMSleepMonitor *self = MM_SLEEP_MONITOR (user_data);
+    char *owner;
+
+    g_assert (proxy == self->sd_proxy);
+
+    owner = g_dbus_proxy_get_name_owner (proxy);
+    if (owner)
+        take_inhibitor (self);
+    else
+        drop_inhibitor (self);
+    g_free (owner);
+}
+
+static void
+on_proxy_acquired (GObject *object,
+                   GAsyncResult *res,
+                   MMSleepMonitor *self)
+{
+    GError *error = NULL;
+    char *owner;
+
+    self->sd_proxy = g_dbus_proxy_new_for_bus_finish (res, &error);
+    if (!self->sd_proxy) {
+        mm_obj_warn (self, "failed to acquire logind proxy: %s", error->message);
+        g_clear_error (&error);
+        return;
+    }
+
+    g_signal_connect (self->sd_proxy, "notify::g-name-owner", G_CALLBACK (name_owner_cb), self);
+    g_signal_connect (self->sd_proxy, "g-signal", G_CALLBACK (signal_cb), self);
+
+    owner = g_dbus_proxy_get_name_owner (self->sd_proxy);
+    if (owner)
+        take_inhibitor (self);
+    g_free (owner);
+}
+
+static void
+mm_sleep_monitor_init (MMSleepMonitor *self)
+{
+    self->inhibit_fd = -1;
+    g_dbus_proxy_new_for_bus (G_BUS_TYPE_SYSTEM,
+                              G_DBUS_PROXY_FLAGS_DO_NOT_AUTO_START |
+                              G_DBUS_PROXY_FLAGS_DO_NOT_LOAD_PROPERTIES,
+                              NULL,
+                              SD_NAME, SD_PATH, SD_INTERFACE,
+                              NULL,
+                              (GAsyncReadyCallback) on_proxy_acquired, self);
+}
+
+static void
+finalize (GObject *object)
+{
+    MMSleepMonitor *self = MM_SLEEP_MONITOR (object);
+
+    drop_inhibitor (self);
+    if (self->sd_proxy)
+        g_object_unref (self->sd_proxy);
+
+    if (G_OBJECT_CLASS (mm_sleep_monitor_parent_class)->finalize != NULL)
+        G_OBJECT_CLASS (mm_sleep_monitor_parent_class)->finalize (object);
+}
+
+static void
+log_object_iface_init (MMLogObjectInterface *iface)
+{
+    iface->build_id = log_object_build_id;
+}
+
+static void
+mm_sleep_monitor_class_init (MMSleepMonitorClass *klass)
+{
+    GObjectClass *gobject_class;
+
+    gobject_class = G_OBJECT_CLASS (klass);
+
+    gobject_class->finalize = finalize;
+
+    signals[SLEEPING] = g_signal_new (MM_SLEEP_MONITOR_SLEEPING,
+                                      MM_TYPE_SLEEP_MONITOR,
+                                      G_SIGNAL_RUN_LAST,
+                                      G_STRUCT_OFFSET (MMSleepMonitorClass, sleeping),
+                                      NULL,                   /* accumulator      */
+                                      NULL,                   /* accumulator data */
+                                      g_cclosure_marshal_VOID__VOID,
+                                      G_TYPE_NONE, 0);
+    signals[RESUMING] = g_signal_new (MM_SLEEP_MONITOR_RESUMING,
+                                      MM_TYPE_SLEEP_MONITOR,
+                                      G_SIGNAL_RUN_LAST,
+                                      G_STRUCT_OFFSET (MMSleepMonitorClass, resuming),
+                                      NULL,                   /* accumulator      */
+                                      NULL,                   /* accumulator data */
+                                      g_cclosure_marshal_VOID__VOID,
+                                      G_TYPE_NONE, 0);
+}
+
+MM_DEFINE_SINGLETON_GETTER (MMSleepMonitor, mm_sleep_monitor_get, MM_TYPE_SLEEP_MONITOR);
+
+/* ---------------------------------------------------------------------------------------------------- */