set brightness via powerd if it exist (using dbus)

1 files changed, 166 insertions, 0 deletions

diff --git a/src/ib-brightness-powerd-control.c b/src/ib-brightness-powerd-control.c
new file mode 100644
index 0000000..3395bda
--- /dev/null
+++ b/src/ib-brightness-powerd-control.c
@@ -0,0 +1,166 @@
+/*
+ * 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:
+ *     Yuan-Chen Cheng <yc.cheng@canonical.com>
+ */
+
+#include <gudev/gudev.h>
+
+#include <errno.h>
+#include <stdlib.h>
+#include <fcntl.h>
+#include <string.h>
+
+#include "ib-brightness-powerd-control.h"
+
+GDBusProxy*
+powerd_get_proxy(void)
+{
+    GError *error = NULL;
+    GDBusProxy* powerd_proxy = g_dbus_proxy_new_for_bus_sync(G_BUS_TYPE_SYSTEM,
+                G_DBUS_PROXY_FLAGS_NONE,
+                NULL,
+                "com.canonical.powerd",
+                "/com/canonical/powerd",
+                "com.canonical.powerd",
+                NULL,
+                &error);
+
+    if (error != NULL) {
+        g_error_free (error);
+        g_debug ("could not connect to powerd: %s", error->message);
+        return NULL;
+    }
+    return powerd_proxy;
+}
+
+
+static gboolean
+getBrightnessParams(GDBusProxy* powerd_proxy, int *min, int *max, int *dflt, gboolean *ab_supported)
+{
+    GVariant *ret = NULL;
+    GError *error = NULL;
+
+    ret = g_dbus_proxy_call_sync(powerd_proxy,
+            "getBrightnessParams",
+            NULL,
+            G_DBUS_CALL_FLAGS_NONE,
+            -1, NULL, &error);
+    if (!ret) {
+        g_warning("getBrightnessParams failed: %s", error->message);
+        g_error_free(error);
+        return FALSE;
+    }
+
+    g_variant_get(ret, "((iiib))", min, max, dflt, ab_supported);
+    g_variant_unref(ret);
+    return TRUE;
+}
+
+static gboolean setUserBrightness(GDBusProxy* powerd_proxy, int brightness)
+{
+    GVariant *ret = NULL;
+    GError *error = NULL;
+
+    ret = g_dbus_proxy_call_sync(powerd_proxy,
+            "setUserBrightness",
+            g_variant_new("(i)", brightness),
+            G_DBUS_CALL_FLAGS_NONE,
+            -1, NULL, &error);
+    if (!ret) {
+        g_warning("setUserBrightness failed: %s", error->message);
+        g_error_free(error);
+        return FALSE;
+    } else {
+        g_variant_unref(ret);
+        return TRUE;
+    }
+}
+
+struct _IbBrightnessPowerdControl
+{
+    gboolean inited;
+
+    GDBusProxy *powerd_proxy;
+
+    int min;
+    int max;
+    int dflt;
+    gboolean ab_supported;
+
+    int current;
+};
+
+
+static void ib_brightness_init(IbBrightnessPowerdControl *control)
+{
+    gboolean ret = getBrightnessParams(control->powerd_proxy, &(control->min),
+        &(control->max), &(control->dflt), &(control->ab_supported));
+    if (! ret) return;
+
+    ib_brightness_powerd_control_set_value(control, control->max);
+
+    control->inited = TRUE;
+}
+
+IbBrightnessPowerdControl*
+ib_brightness_powerd_control_new (GDBusProxy* powerd_proxy)
+{
+    IbBrightnessPowerdControl *control;
+
+    control = g_new0 (IbBrightnessPowerdControl, 1);
+    control->inited = FALSE;
+    control->powerd_proxy = powerd_proxy;
+
+    ib_brightness_init(control);
+
+    return control;
+}
+
+void
+ib_brightness_powerd_control_set_value (IbBrightnessPowerdControl* self, gint value)
+{
+    gboolean ret;
+    if (! self->inited) return;
+    if (value > self->max || value < self->min) return;
+    ret = setUserBrightness(self->powerd_proxy, value);
+    if (ret)
+    {
+        self->current = value;
+    }
+}
+
+gint
+ib_brightness_powerd_control_get_value (IbBrightnessPowerdControl* self)
+{
+    if (! self->inited) return 0;
+    return self->current;
+}
+
+gint
+ib_brightness_powerd_control_get_max_value (IbBrightnessPowerdControl* self)
+{
+    if (! self->inited) return 0;
+    return self->max;
+}
+
+void
+ib_brightness_powerd_control_free (IbBrightnessPowerdControl *self)
+{
+    g_object_unref (self->powerd_proxy);
+    g_free (self);
+}
+