From: Rene van Paassen <[EMAIL PROTECTED]>
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 <[EMAIL PROTECTED]>
---
drivers/usb/input/aiptek.c | 24 ++----------------------
1 files changed, 2 insertions(+), 22 deletions(-)
diff --git a/drivers/usb/input/aiptek.c b/drivers/usb/input/aiptek.c
index 96b8df7..4cb1a13 100644
--- a/drivers/usb/input/aiptek.c
+++ b/drivers/usb/input/aiptek.c
@@ -377,26 +377,6 @@ static const char *map_val_to_str(const struct aiptek_map
*map, int val)
}
/***********************************************************************
- * 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
--
1.5.0.6
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