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, 171 insertions, 0 deletions

diff --git a/src/mm-sleep-monitor-powerd.c b/src/mm-sleep-monitor-powerd.c
new file mode 100644
index 00000000..4d6d7bba
--- /dev/null
+++ b/src/mm-sleep-monitor-powerd.c
@@ -0,0 +1,171 @@
+/* -*- 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 2022 Google, Inc.
+ * Author: Rukun Mao <rmao@google.com>
+ * Original code from ./mm-sleep-monitor-systemd.c
+ */
+
+#include "config.h"
+
+#include <errno.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <glib/gi18n.h>
+#include <gio/gio.h>
+
+#include "mm-log-object.h"
+#include "mm-utils.h"
+#include "mm-sleep-monitor.h"
+
+#define PD_NAME              "org.chromium.PowerManager"
+#define PD_PATH              "/org/chromium/PowerManager"
+#define PD_INTERFACE         "org.chromium.PowerManager"
+
+struct _MMSleepMonitor {
+    GObject parent_instance;
+
+    GDBusProxy *pd_proxy;
+};
+
+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-powerd");
+}
+
+/********************************************************************/
+
+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 (proxy == self->pd_proxy) {
+        if (strcmp (signalname, "SuspendImminent") == 0) {
+            mm_obj_info (self, "system suspend signal from powerd");
+            g_signal_emit (self, signals[SLEEPING], 0);
+        } else if (strcmp (signalname, "SuspendDone") == 0) {
+            mm_obj_info (self, "system resume signal from powerd");
+            g_signal_emit (self, signals[RESUMING], 0);
+        }
+    }
+}
+
+static void
+on_pd_proxy_acquired (GObject *object,
+                      GAsyncResult *res,
+                      MMSleepMonitor *self)
+{
+    GError *error = NULL;
+    char *owner;
+
+    self->pd_proxy = g_dbus_proxy_new_for_bus_finish (res, &error);
+    if (!self->pd_proxy) {
+        mm_obj_warn (self, "failed to acquire powerd proxy: %s", error->message);
+        g_clear_error (&error);
+        return;
+    }
+
+    g_signal_connect (self->pd_proxy, "g-signal", G_CALLBACK (signal_cb), self);
+}
+
+static void
+mm_sleep_monitor_init (MMSleepMonitor *self)
+{
+    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,
+                              PD_NAME, PD_PATH, PD_INTERFACE,
+                              NULL,
+                              (GAsyncReadyCallback) on_pd_proxy_acquired, self);
+}
+
+static void
+finalize (GObject *object)
+{
+    MMSleepMonitor *self = MM_SLEEP_MONITOR (object);
+
+    if (self->pd_proxy)
+        g_object_unref (self->pd_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);
+
+/* ---------------------------------------------------------------------------------------------------- */