Input: MT - make slot cleanup callable outside mt_sync_frame()

Some semi-mt drivers use the slots in a manual way, but may still
want to call parts of the frame synchronization logic. This patch
makes input_mt_drop_unused callable from those drivers.

Signed-off-by: Henrik Rydberg <rydberg@euromail.se>
Reviewed-by: Benson Leung <bleung@chromium.org>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

diff --git a/drivers/input/input-mt.c b/drivers/input/input-mt.c
index d398f13..c30204f 100644 (file)
--- a/drivers/input/input-mt.c
+++ b/drivers/input/input-mt.c
@@ -236,6 +236,31 @@ void input_mt_report_pointer_emulation(struct input_dev *dev, bool use_count)
 }
 EXPORT_SYMBOL(input_mt_report_pointer_emulation);
 
+/**
+ * input_mt_drop_unused() - Inactivate slots not seen in this frame
+ * @dev: input device with allocated MT slots
+ *
+ * Lift all slots not seen since the last call to this function.
+ */
+void input_mt_drop_unused(struct input_dev *dev)
+{
+       struct input_mt *mt = dev->mt;
+       int i;
+
+       if (!mt)
+               return;
+
+       for (i = 0; i < mt->num_slots; i++) {
+               if (!input_mt_is_used(mt, &mt->slots[i])) {
+                       input_mt_slot(dev, i);
+                       input_event(dev, EV_ABS, ABS_MT_TRACKING_ID, -1);
+               }
+       }
+
+       mt->frame++;
+}
+EXPORT_SYMBOL(input_mt_drop_unused);
+
 /**
  * input_mt_sync_frame() - synchronize mt frame
  * @dev: input device with allocated MT slots
@@ -247,27 +272,18 @@ EXPORT_SYMBOL(input_mt_report_pointer_emulation);
 void input_mt_sync_frame(struct input_dev *dev)
 {
        struct input_mt *mt = dev->mt;
-       struct input_mt_slot *s;
        bool use_count = false;
 
        if (!mt)
                return;
 
-       if (mt->flags & INPUT_MT_DROP_UNUSED) {
-               for (s = mt->slots; s != mt->slots + mt->num_slots; s++) {
-                       if (input_mt_is_used(mt, s))
-                               continue;
-                       input_mt_slot(dev, s - mt->slots);
-                       input_event(dev, EV_ABS, ABS_MT_TRACKING_ID, -1);
-               }
-       }
+       if (mt->flags & INPUT_MT_DROP_UNUSED)
+               input_mt_drop_unused(dev);
 
        if ((mt->flags & INPUT_MT_POINTER) && !(mt->flags & INPUT_MT_SEMI_MT))
                use_count = true;
 
        input_mt_report_pointer_emulation(dev, use_count);
-
-       mt->frame++;
 }
 EXPORT_SYMBOL(input_mt_sync_frame);
 

diff --git a/include/linux/input/mt.h b/include/linux/input/mt.h
index 1b1dfa8..f583ff6 100644 (file)
--- a/include/linux/input/mt.h
+++ b/include/linux/input/mt.h
@@ -105,6 +105,7 @@ void input_mt_report_slot_state(struct input_dev *dev,
 
 void input_mt_report_finger_count(struct input_dev *dev, int count);
 void input_mt_report_pointer_emulation(struct input_dev *dev, bool use_count);
+void input_mt_drop_unused(struct input_dev *dev);
 
 void input_mt_sync_frame(struct input_dev *dev);