1 files changed, 149 insertions, 0 deletions
diff --git a/src/ib-brightness-control.c b/src/ib-brightness-control.c
new file mode 100644
index 0000000..cf1e5ad
--- /dev/null
+++ b/src/ib-brightness-control.c
@@ -0,0 +1,149 @@
+/*
+ * Copyright 2012 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:
+ *     Renato Araujo Oliveira Filho <renato@canonical.com>
+ */
+
+#include <gudev/gudev.h>
+#include <stdlib.h>
+#include <fcntl.h>
+#include <string.h>
+
+#include "ib-brightness-control.h"
+
+struct _IbBrightnessControl
+{
+    gchar *path;
+};
+
+IbBrightnessControl*
+ib_brightness_control_new (void)
+{
+    IbBrightnessControl *control;
+    GUdevClient *client;
+    gchar *path = NULL;
+    GList *devices;
+
+    // detect device
+    client = g_udev_client_new (NULL);
+    devices = g_udev_client_query_by_subsystem (client, "backlight");
+    if (devices != NULL) {
+        GList *device;
+        const gchar *device_type;
+
+        for (device = devices; device != NULL; device = device->next) {
+            device_type = g_udev_device_get_sysfs_attr (device->data, "type");
+            if ((g_strcmp0 (device_type, "firmware") == 0) ||
+                (g_strcmp0 (device_type, "platform") == 0) ||
+                (g_strcmp0 (device_type, "raw") == 0)) {
+                path = g_strdup (g_udev_device_get_sysfs_path (device->data));
+                g_print ("found: %s\n", path);
+                break;
+            }
+        }
+
+        g_list_free_full (devices, g_object_unref);
+    }
+    else {
+        g_warning ("Fail to query backlight devices.");
+    }
+
+    control = g_new0 (IbBrightnessControl, 1);
+    control->path = path;
+
+    g_object_unref (client);
+    return control;
+}
+
+void
+ib_brightness_control_set_value (IbBrightnessControl* self, gint value)
+{
+    gint fd;
+    gchar *filename;
+    gchar *svalue;
+    gint length;
+
+    if (self->path == NULL)
+      return;
+
+    filename = g_build_filename (self->path, "brightness", NULL);
+    fd = open(filename, O_WRONLY);
+    if (fd < 0) {
+        g_warning ("Fail to set brightness.");
+        g_free (filename);
+        return;
+    }
+
+    svalue = g_strdup_printf ("%i", value);
+    length = strlen (svalue);
+
+    if (write (fd, svalue, length) != length) {
+        g_warning ("Fail to write brightness information.");
+    }
+
+    close (fd);
+    g_free (svalue);
+    g_free (filename);
+}
+
+gint
+ib_brightness_control_get_value_from_file (IbBrightnessControl *self, const gchar *file)
+{
+    GError *error;
+    gchar *svalue;
+    gint value;
+    gchar *filename;
+
+    if (self->path == NULL)
+      return 0;
+
+    svalue = NULL;
+    error = NULL;
+    filename = g_build_filename (self->path, file, NULL);
+    g_file_get_contents (filename, &svalue, NULL, &error);
+    if (error) {
+        g_warning ("Fail to get brightness value: %s", error->message);
+        value = -1;
+        g_error_free (error);
+    } else {
+        value = atoi (svalue);
+    }
+
+    g_free (filename);
+
+    return value;
+
+}
+
+gint
+ib_brightness_control_get_value (IbBrightnessControl* self)
+{
+    return ib_brightness_control_get_value_from_file (self, "brightness");
+}
+
+gint
+ib_brightness_control_get_max_value (IbBrightnessControl* self)
+{
+    return ib_brightness_control_get_value_from_file (self, "max_brightness");
+}
+
+void
+ib_brightness_control_free (IbBrightnessControl *self)
+{
+    g_free (self->path);
+    g_free (self);
+}
+