Input: aiptek - kill aiptek_convert_from_2s_complement()

There is no reason to do that, just tell the compiler that
we are dealing with signed values in buffer, that's it.

Signed-off-by: Rene van Paassen <rene.vanpaassen@gmail.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

diff --git a/drivers/input/tablet/aiptek.c b/drivers/input/tablet/aiptek.c
index 0c990e6..3a5e0aa 100644 (file)
--- a/drivers/input/tablet/aiptek.c
+++ b/drivers/input/tablet/aiptek.c
@@ -376,26 +376,6 @@ static const char *map_val_to_str(const struct aiptek_map *map, int val)
        return "unknown";
 }
 
-/***********************************************************************
- * Relative reports deliver values in 2's complement format to
- * deal with negative offsets.
- */
-static int aiptek_convert_from_2s_complement(unsigned char c)
-{
-       int ret;
-       unsigned char b = c;
-       int negate = 0;
-
-       if ((b & 0x80) != 0) {
-               b = ~b;
-               b--;
-               negate = 1;
-       }
-       ret = b;
-       ret = (negate == 1) ? -ret : ret;
-       return ret;
-}
-
 /***********************************************************************
  * aiptek_irq can receive one of six potential reports.
  * The documentation for each is in the body of the function.
@@ -473,8 +453,8 @@ static void aiptek_irq(struct urb *urb)
                        aiptek->diagnostic =
                            AIPTEK_DIAGNOSTIC_SENDING_RELATIVE_IN_ABSOLUTE;
                } else {
-                       x = aiptek_convert_from_2s_complement(data[2]);
-                       y = aiptek_convert_from_2s_complement(data[3]);
+                       x = (signed char) data[2];
+                       y = (signed char) data[3];
 
                        /* jitterable keeps track of whether any button has been pressed.
                         * We're also using it to remap the physical mouse button mask