use powerd for hw alarm wakeups

1 files changed, 304 insertions, 0 deletions

diff --git a/src/wakeup-timer-powerd.cpp b/src/wakeup-timer-powerd.cpp
new file mode 100644
index 0000000..b3dcec8
--- /dev/null
+++ b/src/wakeup-timer-powerd.cpp
@@ -0,0 +1,304 @@
+/*
+ * Copyright 2014 Canonical Ltd.
+ *
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 3, as published
+ * by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranties of
+ * MERCHANTABILITY, SATISFACTORY QUALITY, 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, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *   Charles Kerr <charles.kerr@canonical.com>
+ */
+
+#include <datetime/clock.h>
+#include <datetime/wakeup-timer-powerd.h>
+
+#include <notifications/dbus-shared.h> // BUS_POWERD_NAME
+
+#include <memory> // std::shared_ptr
+
+namespace unity {
+namespace indicator {
+namespace datetime {
+
+/***
+****
+***/
+
+class PowerdWakeupTimer::Impl
+{
+public:
+
+    Impl(const std::shared_ptr<Clock>& clock):
+        m_clock(clock),
+        m_cancellable(g_cancellable_new())
+    {
+        g_bus_get(G_BUS_TYPE_SYSTEM, m_cancellable, on_bus_ready, this);
+    }
+
+    ~Impl()
+    {
+        clear_current_cookie();
+
+        g_cancellable_cancel(m_cancellable);
+        g_clear_object(&m_cancellable);
+
+        if (m_sub_id)
+            g_dbus_connection_signal_unsubscribe(m_bus.get(), m_sub_id);
+
+        if (m_watch_tag)
+            g_bus_unwatch_name(m_watch_tag);
+    }
+
+    void set_wakeup_time(const DateTime& d)
+    {
+        m_wakeup_time = d;
+        update_cookie();
+    }
+
+    core::Signal<>& timeout() { return m_timeout; }
+
+private:
+
+    void emit_timeout() { return m_timeout(); }
+
+    static void on_bus_ready(GObject      * /*unused*/,
+                             GAsyncResult * res,
+                             gpointer       gself)
+    {
+        GError * error;
+        GDBusConnection * bus;
+
+        error = nullptr;
+        bus = g_bus_get_finish(res, &error);
+        if (bus == nullptr)
+        {
+            if (!g_error_matches(error, G_IO_ERROR, G_IO_ERROR_CANCELLED))
+                g_warning("%s Couldn't get system bus: %s", G_STRLOC, error->message);
+        }
+        else
+        {
+            static_cast<Impl*>(gself)->init_bus(bus);
+        }
+
+        g_clear_object(&bus);
+        g_clear_error(&error);
+    }
+
+    void init_bus(GDBusConnection* connection)
+    {
+        m_bus.reset(G_DBUS_CONNECTION(g_object_ref(G_OBJECT(connection))),
+                    [](GDBusConnection *c){g_object_unref(G_OBJECT(c));});
+
+        m_sub_id = g_dbus_connection_signal_subscribe(m_bus.get(),
+                                                      BUS_POWERD_NAME,
+                                                      BUS_POWERD_INTERFACE,
+                                                      "Wakeup",
+                                                      BUS_POWERD_PATH,
+                                                      nullptr,
+                                                      G_DBUS_SIGNAL_FLAGS_NONE,
+                                                      on_wakeup_signal,
+                                                      this, // userdata
+                                                      nullptr); // userdata free
+
+        m_watch_tag = g_bus_watch_name_on_connection(m_bus.get(),
+                                                     BUS_POWERD_NAME,
+                                                     G_BUS_NAME_WATCHER_FLAGS_NONE,
+                                                     on_name_appeared_static,
+                                                     nullptr, // name-vanished,
+                                                     this, // userdata
+                                                     nullptr); // userdata free
+    }
+
+    static void
+    on_wakeup_signal(GDBusConnection * /*connection*/,
+                     const gchar     * sender_name,
+                     const gchar     * /*object_path*/,
+                     const gchar     * /*interface_name*/,
+                     const gchar     * signal_name,
+                     GVariant        * /*parameters*/,
+                     gpointer          gself)
+    {
+        g_debug("%s got DBus signal '%s' from '%s'", G_STRLOC, signal_name, sender_name);
+        static_cast<Impl*>(gself)->emit_timeout();
+    }
+
+    static void
+    on_name_appeared_static(GDBusConnection * /*connection*/,
+                            const gchar     * name,
+                            const gchar     * name_owner,
+                            gpointer          gself)
+    {
+        g_debug("%s %s owns %s now; let's ask for a new cookie", G_STRLOC, name, name_owner);
+        static_cast<Impl*>(gself)->update_cookie();
+    }
+
+    /***
+    ****  requestWakeup
+    ***/
+
+    void update_cookie()
+    {
+        if (!m_bus)
+            return;
+
+        // if we've already got a cookie, clear it
+        clear_current_cookie();
+        g_warn_if_fail(m_cookie.empty());
+
+        // get a new cookie, if necessary
+        if (m_wakeup_time.is_set())
+        {
+            g_debug("%s calling %s::requestWakeup(%s)",
+                    G_STRLOC, BUS_POWERD_NAME,
+                    m_wakeup_time.format("%F %T").c_str());
+
+            auto args = g_variant_new("(st)",
+                                      GETTEXT_PACKAGE,
+                                      uint64_t(m_wakeup_time.to_unix()));
+
+            g_dbus_connection_call(m_bus.get(),
+                                   BUS_POWERD_NAME,
+                                   BUS_POWERD_PATH,
+                                   BUS_POWERD_INTERFACE,
+                                   "requestWakeup", // method_name
+                                   args,
+                                   G_VARIANT_TYPE("(s)"), // reply_type
+                                   G_DBUS_CALL_FLAGS_NONE,
+                                   -1, // use default timeout
+                                   m_cancellable,
+                                   on_request_wakeup_done,
+                                   this);
+        }
+    }
+
+    static void on_request_wakeup_done(GObject      * o,
+                                       GAsyncResult * res,
+                                       gpointer       gself)
+    {
+        GError * error;
+        GVariant * ret;
+
+        error = nullptr;
+        ret = g_dbus_connection_call_finish(G_DBUS_CONNECTION(o), res, &error);
+        if (ret == nullptr)
+        {
+            if (!g_error_matches(error, G_IO_ERROR, G_IO_ERROR_CANCELLED))
+                g_warning("%s Could not set hardware wakeup: %s", G_STRLOC, error->message);
+        }
+        else
+        {
+            const char* s = NULL;
+            g_variant_get(ret, "(&s)", &s);
+            g_debug("%s %s::requestWakeup() sent cookie %s",
+                    G_STRLOC, BUS_POWERD_NAME, s);
+
+            auto& cookie = static_cast<Impl*>(gself)->m_cookie;
+            if (s != nullptr)
+                cookie = s;
+            else
+                cookie.clear();
+        }
+
+        // cleanup
+        g_clear_pointer(&ret, g_variant_unref);
+        g_clear_error(&error);
+    }
+
+    /***
+    ****  clearWakeup
+    ***/
+
+    void clear_current_cookie()
+    {
+        if (!m_cookie.empty())
+        {
+            g_debug("%s calling %s::clearWakeup(%s)",
+                    G_STRLOC, BUS_POWERD_NAME, m_cookie.c_str());
+
+            g_dbus_connection_call(m_bus.get(),
+                                   BUS_POWERD_NAME,
+                                   BUS_POWERD_PATH,
+                                   BUS_POWERD_INTERFACE,
+                                   "clearWakeup", // method_name
+                                   g_variant_new("(s)", m_cookie.c_str()),
+                                   nullptr, // no response type
+                                   G_DBUS_CALL_FLAGS_NONE,
+                                   -1, // use default timeout
+                                   nullptr, // cancellable
+                                   on_clear_wakeup_done,
+                                   nullptr);
+            m_cookie.clear();
+        }
+    }
+
+    // this is only here to log errors
+    static void on_clear_wakeup_done(GObject      * o,
+                                     GAsyncResult * res,
+                                     gpointer       /*unused*/)
+    {
+        GError * error;
+        GVariant * ret;
+
+        error = nullptr;
+        ret = g_dbus_connection_call_finish(G_DBUS_CONNECTION(o), res, &error);
+        if (!ret && !g_error_matches(error, G_IO_ERROR, G_IO_ERROR_CANCELLED))
+            g_warning("%s Couldn't clear hardware wakeup: %s", G_STRLOC, error->message);
+
+        // cleanup
+        g_clear_pointer(&ret, g_variant_unref);
+        g_clear_error(&error);
+    }
+
+    /***
+    ****
+    ***/
+
+    core::Signal<> m_timeout;
+    const std::shared_ptr<Clock>& m_clock;
+    DateTime m_wakeup_time;
+
+    std::shared_ptr<GDBusConnection> m_bus;
+    GCancellable * m_cancellable = nullptr;
+    std::string m_cookie;
+    guint m_watch_tag = 0;
+    guint m_sub_id = 0;
+};
+
+/***
+****
+***/
+
+PowerdWakeupTimer::PowerdWakeupTimer(const std::shared_ptr<Clock>& clock):
+    p(new Impl(clock))
+{
+}
+
+PowerdWakeupTimer::~PowerdWakeupTimer()
+{
+}
+
+void PowerdWakeupTimer::set_wakeup_time(const DateTime& d)
+{
+    p->set_wakeup_time(d);
+}
+
+core::Signal<>& PowerdWakeupTimer::timeout()
+{
+    return p->timeout();
+}
+
+/***
+****
+***/
+
+} // namespace datetime
+} // namespace indicator
+} // namespace unity