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Sourcecode: gnome-session version File versions

gsm-power-manager.c

/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 8 -*-
 *
 * power-manager.h: functions for powering down, restarting, and
 *                  suspending the computer
 * Copyright (C) 2006 Ray Strode <rstrode@redhat.com>
 *
 * 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, 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.
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include "gsm-power-manager.h"

#include <errno.h>
#include <string.h>

#include <glib.h>
#include <glib-object.h>
#include <glib/gi18n.h>

#include <dbus/dbus-glib.h>

struct _GsmPowerManagerPrivate
{
        DBusGConnection  *dbus_connection;
        DBusGProxy       *bus_proxy;
        DBusGProxy       *gpm_proxy;
        guint32           is_connected : 1;
};

static void gsm_power_manager_finalize                 (GObject *object);

static void gsm_power_manager_class_install_signals    (GsmPowerManagerClass *manager_class);

static void gsm_power_manager_class_install_properties (GsmPowerManagerClass *manager_class);

static void gsm_power_manager_get_property (GObject    *object,
                                            guint       prop_id,
                                            GValue     *value,
                                            GParamSpec *pspec);

static gboolean ensure_gpm_connection (GsmPowerManager  *manager,
                                       GError          **error);

enum {
        PROP_0 = 0,
        PROP_IS_CONNECTED
};

enum {
        REQUEST_FAILED = 0,
        LAST_SIGNAL
};

static guint signals[LAST_SIGNAL];

G_DEFINE_TYPE (GsmPowerManager, gsm_power_manager, G_TYPE_OBJECT);

static void
gsm_power_manager_class_init (GsmPowerManagerClass *manager_class)
{
        GObjectClass *object_class;

        object_class = G_OBJECT_CLASS (manager_class);

        object_class->finalize = gsm_power_manager_finalize;

        gsm_power_manager_class_install_properties (manager_class);
        gsm_power_manager_class_install_signals (manager_class);

        g_type_class_add_private (manager_class,
                                  sizeof (GsmPowerManagerPrivate));
}

static void
gsm_power_manager_class_install_signals (GsmPowerManagerClass *manager_class)
{
        GObjectClass *object_class;

        object_class = G_OBJECT_CLASS (manager_class);

        signals[REQUEST_FAILED] =
                g_signal_new ("request-failed",
                              G_OBJECT_CLASS_TYPE (object_class),
                              G_SIGNAL_RUN_LAST,
                              G_STRUCT_OFFSET (GsmPowerManagerClass, request_failed),
                              NULL,
                              NULL,
                              g_cclosure_marshal_VOID__POINTER,
                              G_TYPE_NONE,
                              1, G_TYPE_POINTER);

        manager_class->request_failed = NULL;
}

static void
gsm_power_manager_class_install_properties (GsmPowerManagerClass *manager_class)
{
        GObjectClass *object_class;
        GParamSpec   *param_spec;

        object_class = G_OBJECT_CLASS (manager_class);
        object_class->get_property = gsm_power_manager_get_property;

        param_spec = g_param_spec_boolean ("is-connected",
                                           "Is connected",
                                           "Whether the session is connected to "
                                           "the power manager",
                                           FALSE,
                                           G_PARAM_READABLE);

        g_object_class_install_property (object_class, PROP_IS_CONNECTED,
                                         param_spec);
}

static void
on_name_owner_changed (DBusGProxy      *bus_proxy,
                       const char      *name,
                       const char      *prev_owner,
                       const char      *new_owner,
                       GsmPowerManager *manager)
{
        if (strcmp (name, "org.freedesktop.PowerManagement") != 0) {
                return;
        }

        if (manager->priv->gpm_proxy != NULL) {
                g_object_unref (manager->priv->gpm_proxy);
                manager->priv->gpm_proxy = NULL;
        }

        ensure_gpm_connection (manager, NULL);
}

static gboolean
ensure_gpm_connection (GsmPowerManager  *manager,
                       GError            **error)
{
        GError   *connection_error;
        gboolean  is_connected;

        connection_error = NULL;
        if (manager->priv->dbus_connection == NULL) {
                manager->priv->dbus_connection = dbus_g_bus_get (DBUS_BUS_SESSION,
                                                                 &connection_error);

                if (manager->priv->dbus_connection == NULL) {
                        g_propagate_error (error, connection_error);
                        is_connected = FALSE;
                        goto out;
                }
        }

        if (manager->priv->bus_proxy == NULL) {
                manager->priv->bus_proxy =
                        dbus_g_proxy_new_for_name_owner (manager->priv->dbus_connection,
                                                         DBUS_SERVICE_DBUS,
                                                         DBUS_PATH_DBUS,
                                                         DBUS_INTERFACE_DBUS,
                                                         &connection_error);

                if (manager->priv->bus_proxy == NULL) {
                        g_propagate_error (error, connection_error);
                        is_connected = FALSE;
                        goto out;
                }

                dbus_g_proxy_add_signal (manager->priv->bus_proxy,
                                         "NameOwnerChanged",
                                         G_TYPE_STRING,
                                         G_TYPE_STRING,
                                         G_TYPE_STRING,
                                         G_TYPE_INVALID);

                dbus_g_proxy_connect_signal (manager->priv->bus_proxy,
                                             "NameOwnerChanged",
                                             G_CALLBACK (on_name_owner_changed),
                                             manager, NULL);
        }

        if (manager->priv->gpm_proxy == NULL) {
                manager->priv->gpm_proxy =
                        dbus_g_proxy_new_for_name_owner (
                                                         manager->priv->dbus_connection,
                                                         "org.freedesktop.PowerManagement",
                                                         "/org/freedesktop/PowerManagement",
                                                         "org.freedesktop.PowerManagement",
                                                         &connection_error);

                if (manager->priv->gpm_proxy == NULL) {
                        g_propagate_error (error, connection_error);
                        is_connected = FALSE;
                        goto out;
                }
        }

        is_connected = TRUE;

 out:
        if (manager->priv->is_connected != is_connected) {
                manager->priv->is_connected = is_connected;
                g_object_notify (G_OBJECT (manager), "is-connected");
        }

        if (!is_connected) {
                if (manager->priv->dbus_connection == NULL) {
                        if (manager->priv->bus_proxy != NULL) {
                                g_object_unref (manager->priv->bus_proxy);
                                manager->priv->bus_proxy = NULL;
                        }

                        if (manager->priv->gpm_proxy != NULL) {
                                g_object_unref (manager->priv->gpm_proxy);
                                manager->priv->gpm_proxy = NULL;
                        }
                } else if (manager->priv->bus_proxy == NULL) {
                        if (manager->priv->gpm_proxy != NULL) {
                                g_object_unref (manager->priv->gpm_proxy);
                                manager->priv->gpm_proxy = NULL;
                        }
                }
        }

        return is_connected;
}

static void
gsm_power_manager_init (GsmPowerManager *manager)
{
        GError *error;

        manager->priv = G_TYPE_INSTANCE_GET_PRIVATE (manager,
                                                     GSM_TYPE_POWER_MANAGER,
                                                     GsmPowerManagerPrivate);

        manager->priv->dbus_connection = NULL;
        manager->priv->bus_proxy = NULL;
        manager->priv->gpm_proxy = NULL;
        manager->priv->is_connected = FALSE;

        error = NULL;

        if (!ensure_gpm_connection (manager, &error)) {
                g_message ("Could not connect to power manager: %s",
                           error->message);
                g_error_free (error);
        }
}

static void
gsm_power_manager_finalize (GObject *object)
{
        GsmPowerManager *manager;
        GObjectClass    *parent_class;

        manager = GSM_POWER_MANAGER (object);

        parent_class = G_OBJECT_CLASS (gsm_power_manager_parent_class);

        if (parent_class->finalize != NULL) {
                parent_class->finalize (object);
        }
}

static void
gsm_power_manager_get_property (GObject    *object,
                                guint       prop_id,
                                GValue     *value,
                                GParamSpec *pspec)
{
        GsmPowerManager *manager = GSM_POWER_MANAGER (object);

        switch (prop_id) {
        case PROP_IS_CONNECTED:
                g_value_set_boolean (value,
                                     manager->priv->is_connected);
                break;

        default:
                G_OBJECT_WARN_INVALID_PROPERTY_ID (object,
                                                   prop_id,
                                                   pspec);
        }
}

GQuark
gsm_power_manager_error_quark (void)
{
        static GQuark error_quark = 0;

        if (error_quark == 0)
                error_quark = g_quark_from_static_string ("gsm-power-manager-error");

        return error_quark;
}

GsmPowerManager *
gsm_power_manager_new (void)
{
        GsmPowerManager *manager;

        manager = g_object_new (GSM_TYPE_POWER_MANAGER, NULL);

        return manager;
}

gboolean
gsm_power_manager_can_suspend (GsmPowerManager *manager)
{
        GError  *error;
        gboolean can_suspend;

        error = NULL;

        if (!ensure_gpm_connection (manager, &error)) {
                g_message ("Could not connect to power manager: %s",
                           error->message);

                g_error_free (error);

                return FALSE;
        }

        can_suspend = FALSE;

        if (!dbus_g_proxy_call (manager->priv->gpm_proxy, "CanSuspend",
                                &error,
                                G_TYPE_INVALID,
                                G_TYPE_BOOLEAN, &can_suspend, G_TYPE_INVALID)) {
                if (error != NULL) {
                        g_message ("Could not ask power manager if user can suspend: %s",
                                   error->message);

                        g_error_free (error);
                }

                can_suspend = FALSE;
        }

        return can_suspend;
}

gboolean
gsm_power_manager_can_hibernate (GsmPowerManager *manager)
{
        GError  *error;
        gboolean can_hibernate;

        error = NULL;

        if (!ensure_gpm_connection (manager, &error)) {
                g_message ("Could not connect to power manager: %s",
                           error->message);

                g_error_free (error);

                return FALSE;
        }

        can_hibernate = FALSE;

        if (!dbus_g_proxy_call (manager->priv->gpm_proxy, "CanHibernate",
                                &error,
                                G_TYPE_INVALID,
                                G_TYPE_BOOLEAN, &can_hibernate, G_TYPE_INVALID)) {
                if (error != NULL) {
                        g_message ("Could not ask power manager if user can suspend: %s",
                                   error->message);

                        g_error_free (error);
                }

                can_hibernate = FALSE;
        }

        return can_hibernate;
}

void
gsm_power_manager_attempt_suspend (GsmPowerManager *manager)
{
        GError *error;

        error = NULL;

        if (!ensure_gpm_connection (manager, &error)) {
                g_warning ("Could not connect to power manager: %s",
                           error->message);
                g_error_free (error);
                return;
        }

        if (!dbus_g_proxy_call (manager->priv->gpm_proxy, "Suspend",
                                &error,
                                G_TYPE_INVALID, G_TYPE_INVALID) &&
            error != NULL) {
                GError *call_error;

                g_warning ("Could not ask power manager to suspend: %s",
                           error->message);

                call_error = g_error_new_literal (GSM_POWER_MANAGER_ERROR,
                                                  GSM_POWER_MANAGER_ERROR_SUSPENDING,
                                                  error->message);

                g_error_free (error);

                g_signal_emit (G_OBJECT (manager),
                               signals[REQUEST_FAILED],
                               0, call_error);

                g_error_free (call_error);
        }
}

void
gsm_power_manager_attempt_hibernate (GsmPowerManager *manager)
{
        GError *error;

        error = NULL;
        if (!ensure_gpm_connection (manager, &error)) {
                g_warning ("Could not connect to power manager: %s",
                           error->message);

                g_error_free (error);

                return;
        }

        if (!dbus_g_proxy_call (manager->priv->gpm_proxy, "Hibernate",
                                &error,
                                G_TYPE_INVALID, G_TYPE_INVALID) &&
            error != NULL) {
                GError *call_error;

                g_warning ("Could not ask power manager to hibernate: %s",
                           error->message);

                call_error = g_error_new_literal (GSM_POWER_MANAGER_ERROR,
                                                  GSM_POWER_MANAGER_ERROR_HIBERNATING,
                                                  error->message);

                g_error_free (error);

                g_signal_emit (G_OBJECT (manager),
                               signals[REQUEST_FAILED],
                               0, call_error);

                g_error_free (call_error);
        }
}


GsmPowerManager *
gsm_get_power_manager (void)
{
        static GsmPowerManager *manager = NULL;

        if (manager == NULL) {
                manager = gsm_power_manager_new ();
        }

        return g_object_ref (manager);
}

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