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[210.215.155.42]) by smtp.gmail.com with ESMTPSA id a92af1059eb24-1903d3ae06fsm2409008c88.19.2026.10.20.19.23.58 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 20 Oct 2026 19:24:00 -0700 (PDT) From: Miro Kropacek To: geert@linux-m68k.org, dmitry.torokhov@gmail.com Cc: schmitzmic@gmail.com, linux-m68k@vger.kernel.org, linux-input@vger.kernel.org, linux-kernel@vger.kernel.org, Miro Kropacek Subject: [PATCH v5] m68k: Fix atari mouse movement Date: Wed, 21 Oct 2026 12:23:36 +1000 Message-ID: <20261021022336.2232886-1-miro.kropacek@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20261021000338.2160223-1-miro.kropacek@gmail.com> References: <20261021000338.2160223-1-miro.kropacek@gmail.com> X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Kernels are built with -funsigned-char since version 6.2, resulting in the signed 8-bit position deltas reported by the IKBD being misinterpreted as unsigned. The hook is handed a raw IKBD packet, so take it as a byte stream and apply the sign to the two displacement values alone. Fixes: 3bc753c06dd02a35 ("kbuild: treat char as always unsigned") Link: https://lists.debian.org/debian-68k/2026/08/msg00000.html Suggested-by: Dmitry Torokhov Signed-off-by: Miro Kropacek Cc: linux-input --- Changes in v5: - take the packet as u8 * and cast only the two displacement values, as suggested; this drops the call-site cast v4 needed, and with it the -Wpointer-sign warning - add the types include atarikb.h now relies on The same cast of the two displacement values was tested on an Atari Falcon030 with CT60 in v1 of this patch; v5 differs from it only in the type of the hook argument. Michael's Reviewed-by from v3 is dropped, as the approach has changed twice since. arch/m68k/atari/atakeyb.c | 2 +- arch/m68k/include/asm/atarikb.h | 4 +++- drivers/input/mouse/atarimouse.c | 6 +++--- 3 files changed, 7 insertions(+), 5 deletions(-) diff --git a/arch/m68k/atari/atakeyb.c b/arch/m68k/atari/atakeyb.c index 49a9a459bdf4..b715e2b8351c 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)(u8 *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..bdf67bff1472 100644 --- a/arch/m68k/include/asm/atarikb.h +++ b/arch/m68k/include/asm/atarikb.h @@ -15,6 +15,8 @@ #ifndef _LINUX_ATARIKB_H #define _LINUX_ATARIKB_H +#include + void ikbd_write(const char *, int); void ikbd_mouse_button_action(int mode); void ikbd_mouse_rel_pos(void); @@ -37,7 +39,7 @@ 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)(u8 *buf); int atari_keyb_init(void); diff --git a/drivers/input/mouse/atarimouse.c b/drivers/input/mouse/atarimouse.c index b1219cc4d9a2..c5b794262e85 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(u8 *buf) { int buttons, dx, dy; @@ -71,8 +71,8 @@ static void atamouse_interrupt(char *buf) #endif /* only relative events get here */ - dx = buf[1]; - dy = buf[2]; + dx = (s8)buf[1]; + dy = (s8)buf[2]; input_report_rel(atamouse_dev, REL_X, dx); input_report_rel(atamouse_dev, REL_Y, dy); -- 2.43.0