[PATCH] HID: logitech: Disable hi-res scrolling on USB

[PATCH] HID: logitech: Disable hi-res scrolling on USB

[Bastien Nocera]

On some Logitech mice, such as the G903, and possibly the G403, the HID
events are generated on a different interface to the HID++ one.

If we enable hi-res through the HID++ interface, the HID interface
wouldn't know anything about it, and handle the events as if they were
regular scroll events, making the mouse unusable.

Disable hi-res scrolling on those devices until we implement scroll
events through HID++.

Signed-off-by: Bastien Nocera <hadess@hadess.net>
Tested-by: Tobias Klausmann <klausman@schwarzvogel.de>
Link: https://bugzilla.kernel.org/show_bug.cgi?id=216885
Fixes: 908d325e1665 ("HID: logitech-hidpp: Detect hi-res scrolling support")
Cc: stable@vger.kernel.org
---
 drivers/hid/hid-logitech-hidpp.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/hid/hid-logitech-hidpp.c b/drivers/hid/hid-logitech-hidpp.c
index abf2c95e4d0b..9c1ee8e91e0c 100644
--- a/drivers/hid/hid-logitech-hidpp.c
+++ b/drivers/hid/hid-logitech-hidpp.c
@@ -3978,7 +3978,8 @@ static void hidpp_connect_event(struct hidpp_device *hidpp)
 	}
 
 	hidpp_initialize_battery(hidpp);
-	hidpp_initialize_hires_scroll(hidpp);
+	if (!hid_is_usb(hidpp->hid_dev))
+		hidpp_initialize_hires_scroll(hidpp);
 
 	/* forward current battery state */
 	if (hidpp->capabilities & HIDPP_CAPABILITY_HIDPP10_BATTERY) {
-- 
2.39.1

Re: [PATCH] HID: logitech: Disable hi-res scrolling on USB

[Benjamin Tissoires]

On Fri, 03 Feb 2023 11:18:00 +0100, Bastien Nocera wrote:
> On some Logitech mice, such as the G903, and possibly the G403, the HID
> events are generated on a different interface to the HID++ one.
> 
> If we enable hi-res through the HID++ interface, the HID interface
> wouldn't know anything about it, and handle the events as if they were
> regular scroll events, making the mouse unusable.
> 
> [...]

Applied to hid/hid.git (for-6.2/upstream-fixes), thanks!

[1/1] HID: logitech: Disable hi-res scrolling on USB
      https://git.kernel.org/hid/hid/c/690eb7dec72a

Cheers,
-- 
Benjamin Tissoires <benjamin.tissoires@redhat.com>