Remove references to powerd since the brightness interface is now provided by Unity.Screen

1 files changed, 202 insertions, 0 deletions

diff --git a/src/ib-brightness-uscreen-control.c b/src/ib-brightness-uscreen-control.c
new file mode 100644
index 0000000..4f8cd3e
--- /dev/null
+++ b/src/ib-brightness-uscreen-control.c
@@ -0,0 +1,202 @@
+/*
+ * 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 "ib-brightness-uscreen-control.h"
+
+static gboolean getBrightnessParams(GDBusProxy* powerd_proxy, int *dim, int *min,
+    int *max, int *dflt, gboolean *ab_supported);
+
+GDBusProxy*
+uscreen_get_proxy(brightness_params_t *params)
+{
+    GError *error = NULL;
+    gboolean ret;
+
+    g_return_val_if_fail (params != NULL, NULL);
+
+    /* For now we still need to obtain the brigthness params from powerd */
+    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_debug ("could not connect to powerd: %s", error->message);
+        g_error_free (error);
+        return NULL;
+    }
+
+    ret = getBrightnessParams(powerd_proxy, &(params->dim), &(params->min),
+        &(params->max), &(params->dflt), &(params->ab_supported));
+
+    if (! ret)
+    {
+        g_debug ("can't get brightness parameters from powerd");
+        g_object_unref (powerd_proxy);
+        return NULL;
+    }
+
+    g_clear_object (&powerd_proxy);
+
+    GDBusProxy* uscreen_proxy = g_dbus_proxy_new_for_bus_sync(G_BUS_TYPE_SYSTEM,
+                G_DBUS_PROXY_FLAGS_NONE,
+                NULL,
+                "com.canonical.Unity.Screen",
+                "/com/canonical/Unity/Screen",
+                "com.canonical.Unity.Screen",
+                NULL,
+                &error);
+
+    if (error != NULL)
+    {
+        g_debug ("could not connect to unity screen: %s", error->message);
+        g_error_free (error);
+        return NULL;
+    }
+
+    return uscreen_proxy;
+}
+
+
+static gboolean
+getBrightnessParams(GDBusProxy* powerd_proxy, int *dim, 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,
+            400, NULL, &error); // timeout: 400 ms
+    if (!ret)
+    {
+        if (error != NULL)
+        {
+            if (!g_error_matches(error, G_DBUS_ERROR, G_DBUS_ERROR_SERVICE_UNKNOWN))
+            {
+                g_warning("getBrightnessParams from powerd failed: %s", error->message);
+            }
+            g_error_free(error);
+        }
+        return FALSE;
+    }
+
+    g_variant_get(ret, "((iiiib))", dim, min, max, dflt, ab_supported);
+    g_variant_unref(ret);
+    return TRUE;
+}
+
+static gboolean setUserBrightness(GDBusProxy* uscreen_proxy, GCancellable *gcancel, int brightness)
+{
+    GVariant *ret = NULL;
+    GError *error = NULL;
+
+    ret = g_dbus_proxy_call_sync(uscreen_proxy,
+            "setUserBrightness",
+            g_variant_new("(i)", brightness),
+            G_DBUS_CALL_FLAGS_NONE,
+            -1, gcancel, &error);
+    if (!ret) {
+        g_warning("setUserBrightness via powerd failed: %s", error->message);
+        g_error_free(error);
+        return FALSE;
+    } else {
+        g_variant_unref(ret);
+        return TRUE;
+    }
+}
+
+struct _IbBrightnessUScreenControl
+{
+    GDBusProxy *uscreen_proxy;
+    GCancellable *gcancel;
+
+    int dim;
+    int min;
+    int max;
+    int dflt; // defalut value
+    gboolean ab_supported;
+
+    int current;
+};
+
+IbBrightnessUscreenControl*
+ib_brightness_uscreen_control_new (GDBusProxy* uscreen_proxy, brightness_params_t params)
+{
+    IbBrightnessUscreenControl *control;
+
+    control = g_new0 (IbBrightnessUscreenControl, 1);
+    control->uscreen_proxy = uscreen_proxy;
+    control->gcancel = g_cancellable_new();
+
+    control->dim = params.dim;
+    control->min = params.min;
+    control->max = params.max;
+    control->dflt = params.dflt;
+    control->ab_supported = params.ab_supported;
+
+    // XXX: set the brightness value is the only way to sync the brightness value with
+    // unity.screen, and we should set the user prefered / last set brightness value upon startup.
+    // Before we have code to store last set brightness value or other mechanism, we set
+    // it to default brightness that powerd proposed.
+    ib_brightness_uscreen_control_set_value(control, control->dflt);
+
+    return control;
+}
+
+void
+ib_brightness_uscreen_control_set_value (IbBrightnessUscreenControl* self, gint value)
+{
+    gboolean ret;
+
+    value = CLAMP(value, self->min, self->max);
+    ret = setUserBrightness(self->uscreen_proxy, self->gcancel, value);
+    if (ret)
+    {
+        self->current = value;
+    }
+}
+
+gint
+ib_brightness_uscreen_control_get_value (IbBrightnessUscreenControl* self)
+{
+    return self->current;
+}
+
+gint
+ib_brightness_uscreen_control_get_max_value (IbBrightnessUscreenControl* self)
+{
+    return self->max;
+}
+
+void
+ib_brightness_uscreen_control_free (IbBrightnessUscreenControl *self)
+{
+    g_cancellable_cancel (self->gcancel);
+    g_object_unref (self->gcancel);
+    g_object_unref (self->uscreen_proxy);
+    g_free (self);
+}
+