Input: of_touchscreen - add support for inverted / swapped axes

Extend touchscreen_parse_properties() with support for the
touchscreen-inverted-x/y and touchscreen-swapped-x-y properties and
add touchscreen_set_mt_pos() and touchscreen_report_pos() helper
functions for storing coordinates into a input_mt_pos struct, or
directly reporting them, taking these properties into account.

This commit also modifies the existing callers of
touchscreen_parse_properties() to pass in NULL for the new third
argument, keeping the existing behavior.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

1 files changed, 20 insertions, 1 deletions

diff --git a/include/linux/input/touchscreen.h b/include/linux/input/touchscreen.h
index c91e1376132b..09d22ccb9e41 100644
--- a/include/linux/input/touchscreen.h
+++ b/include/linux/input/touchscreen.h
@@ -10,7 +10,26 @@
 #define _TOUCHSCREEN_H
 
 struct input_dev;
+struct input_mt_pos;
 
-void touchscreen_parse_properties(struct input_dev *dev, bool multitouch);
+struct touchscreen_properties {
+        unsigned int max_x;
+        unsigned int max_y;
+        bool invert_x;
+        bool invert_y;
+        bool swap_x_y;
+};
+
+void touchscreen_parse_properties(struct input_dev *input, bool multitouch,
+                                  struct touchscreen_properties *prop);
+
+void touchscreen_set_mt_pos(struct input_mt_pos *pos,
+                            const struct touchscreen_properties *prop,
+                            unsigned int x, unsigned int y);
+
+void touchscreen_report_pos(struct input_dev *input,
+                            const struct touchscreen_properties *prop,
+                            unsigned int x, unsigned int y,
+                            bool multitouch);
 
 #endif