[gnome-settings-daemon] power: Disable touchscreens when turning off its screen

[Bastien Nocera <hadess src gnome org>]

commit ab2b808655d0aa949ee22d7fd31d288a1ffc90bf
Author: Bastien Nocera <hadess hadess net>
Date:   Fri Jul 25 11:57:08 2014 +0200

    power: Disable touchscreens when turning off its screen
    
    For example, turning off a tablet's touchscreen when the screenlock
    kicks in.
    
    Note that this is currently broken due to bugs in the kernel.
    For the X.org tracking bug, see
    https://bugs.freedesktop.org/show_bug.cgi?id=81781
    
    And a possible patch exists at:
    https://lkml.org/lkml/2014/9/30/588
    
    https://bugzilla.gnome.org/show_bug.cgi?id=720295

 plugins/power/gsd-power-manager.c |   50 +++++++++++++++++++++++++++++++++++++
 1 files changed, 50 insertions(+), 0 deletions(-)
---
diff --git a/plugins/power/gsd-power-manager.c b/plugins/power/gsd-power-manager.c
index e565d28..0c2469d 100644
--- a/plugins/power/gsd-power-manager.c
+++ b/plugins/power/gsd-power-manager.c
@@ -37,6 +37,7 @@
 #include <libgnome-desktop/gnome-idle-monitor.h>
 
 #include <gsd-input-helper.h>
+#include <gsd-device-mapper.h>
 
 #include "gsd-power-constants.h"
 #include "gsm-inhibitor-flag.h"
@@ -128,6 +129,7 @@ struct GsdPowerManagerPrivate
         /* Screensaver */
         GsdScreenSaver          *screensaver_proxy;
         gboolean                 screensaver_active;
+        GList                   *disabled_devices;
 
         /* State */
         gboolean                 lid_is_present;
@@ -915,6 +917,47 @@ action_hibernate (GsdPowerManager *manager)
 }
 
 static void
+screen_devices_disable (GsdPowerManager *manager)
+{
+        GsdDeviceMapper *mapper;
+        GdkDeviceManager *device_manager;
+        GList *devices, *l, *to_change;
+
+        mapper = gsd_device_mapper_get ();
+        device_manager = gdk_display_get_device_manager (gdk_display_get_default ());
+        devices = gdk_device_manager_list_devices (device_manager, GDK_DEVICE_TYPE_SLAVE);
+        to_change = NULL;
+        for (l = devices; l != NULL; l = l->next ) {
+                GdkDevice *device = l->data;
+
+                if (gsd_device_mapper_get_device_output (mapper, device) != NULL) {
+                        int device_id;
+
+                        g_object_get (device, "device-id", &device_id, NULL);
+                        to_change = g_list_prepend (to_change, GINT_TO_POINTER (device_id));
+                }
+        }
+        g_list_free (devices);
+
+        for (l = to_change; l != NULL; l = l->next)
+                set_device_enabled (GPOINTER_TO_INT (l->data), FALSE);
+
+        g_clear_pointer (&manager->priv->disabled_devices, g_list_free);
+        manager->priv->disabled_devices = to_change;
+}
+
+static void
+screen_devices_enable (GsdPowerManager *manager)
+{
+        GList *l;
+
+        for (l = manager->priv->disabled_devices; l != NULL; l = l->next)
+                set_device_enabled (GPOINTER_TO_INT (l->data), TRUE);
+
+        g_clear_pointer (&manager->priv->disabled_devices, g_list_free);
+}
+
+static void
 backlight_enable (GsdPowerManager *manager)
 {
         gboolean ret;
@@ -929,6 +972,8 @@ backlight_enable (GsdPowerManager *manager)
                 g_error_free (error);
         }
 
+        screen_devices_enable (manager);
+
         g_debug ("TESTSUITE: Unblanked screen");
 }
 
@@ -946,6 +991,9 @@ backlight_disable (GsdPowerManager *manager)
                            error->message);
                 g_error_free (error);
         }
+
+        screen_devices_disable (manager);
+
         g_debug ("TESTSUITE: Blanked screen");
 }
 
@@ -2407,6 +2455,8 @@ gsd_power_manager_stop (GsdPowerManager *manager)
 {
         g_debug ("Stopping power manager");
 
+        screen_devices_enable (manager);
+
         if (manager->priv->inhibit_lid_switch_timer_id != 0) {
                 g_source_remove (manager->priv->inhibit_lid_switch_timer_id);
                 manager->priv->inhibit_lid_switch_timer_id = 0;