[PATCH v2 1/5] m68k: Fix atari mouse movement

[Michael Schmitz <schmitzmic@gmail.com>]

From: Miro Kropacek <miro.kropacek@gmail.com>

Kernels are built with -funsigned-char since version 6.2, resulting
in signed mouse position deltas getting misinterpreted as unsigned.

Cast deltas passed in (unsigned) scancode buffer to correctly
interpret sign.

Fixes: 3bc753c06dd02a35 ("kbuild: treat char as always unsigned")
Link: https://lists.debian.org/debian-68k/2026/08/msg00000.html
Signed-off-by: Miro Kropacek <miro.kropacek@gmail.com>
Reviewed-by: Michael Schmitz <schmitzmic@gmail.com>
Signed-off-by: Michael Schmitz <schmitzmic@gmail.com>
Cc: linux-input <linux-input@vger.kernel.org>

---
Changes in  v2:

- change atamouse_interrupt function signature to signed char *,
  drop signed casts (Geert)
---
 arch/m68k/atari/atakeyb.c        | 2 +-
 arch/m68k/include/asm/atarikb.h  | 2 +-
 drivers/input/mouse/atarimouse.c | 2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/m68k/atari/atakeyb.c b/arch/m68k/atari/atakeyb.c
index 49a9a459bdf4..86ab73a79177 100644
--- a/arch/m68k/atari/atakeyb.c
+++ b/arch/m68k/atari/atakeyb.c
@@ -39,7 +39,7 @@ void (*atari_MIDI_interrupt_hook) (void);
 /* Hook for keyboard inputdev  driver */
 void (*atari_input_keyboard_interrupt_hook) (unsigned char, char);
 /* Hook for mouse inputdev  driver */
-void (*atari_input_mouse_interrupt_hook) (char *);
+void (*atari_input_mouse_interrupt_hook)(signed char *buf);
 EXPORT_SYMBOL(atari_input_keyboard_interrupt_hook);
 EXPORT_SYMBOL(atari_input_mouse_interrupt_hook);
 
diff --git a/arch/m68k/include/asm/atarikb.h b/arch/m68k/include/asm/atarikb.h
index 68f3622bf591..c5a84c7ee85d 100644
--- a/arch/m68k/include/asm/atarikb.h
+++ b/arch/m68k/include/asm/atarikb.h
@@ -37,7 +37,7 @@ extern void (*atari_MIDI_interrupt_hook) (void);
 /* Hook for keyboard inputdev  driver */
 extern void (*atari_input_keyboard_interrupt_hook) (unsigned char, char);
 /* Hook for mouse inputdev  driver */
-extern void (*atari_input_mouse_interrupt_hook) (char *);
+extern void (*atari_input_mouse_interrupt_hook)(signed char *buf);
 
 int atari_keyb_init(void);
 
diff --git a/drivers/input/mouse/atarimouse.c b/drivers/input/mouse/atarimouse.c
index b1219cc4d9a2..6bac2288c494 100644
--- a/drivers/input/mouse/atarimouse.c
+++ b/drivers/input/mouse/atarimouse.c
@@ -60,7 +60,7 @@ extern int atari_mouse_buttons;
 
 static struct input_dev *atamouse_dev;
 
-static void atamouse_interrupt(char *buf)
+static void atamouse_interrupt(signed char *buf)
 {
 	int buttons, dx, dy;
 
-- 
2.17.1