From: Jason Gerecke killertofu@gmail.com
commit f77810f744139572a63e5a85ab6a8c10c2d44fb1 upstream.
When support was added for devices using an explicit 3rd barrel switch, the logic used by devices emulating this feature was broken. The 'if' statement / block that was introduced only handles the case where the button is pressed (i.e. 'barrelswitch' and 'barrelswitch2' are both set) but not the case where it is released (i.e. one or both being cleared). This results in a BTN_STYLUS3 "down" event being sent when the button is pressed, but no "up" event ever being sent afterwards.
This patch restores the previously-used logic for determining button states in the emulated case so that switches are reported correctly again.
Link: https://github.com/linuxwacom/xf86-input-wacom/issues/292 Fixes: 6d09085b38e5 ("HID: wacom: Adding Support for new usages") CC: stable@vger.kernel.org #v5.19+ Signed-off-by: Jason Gerecke jason.gerecke@wacom.com Tested-by: Joshua Dickens joshua.dickens@wacom.com Reviewed-by: Ping Cheng ping.cheng@wacom.com Signed-off-by: Jiri Kosina jkosina@suse.cz Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/hid/wacom_wac.c | 11 ++++++----- 1 file changed, 6 insertions(+), 5 deletions(-)
--- a/drivers/hid/wacom_wac.c +++ b/drivers/hid/wacom_wac.c @@ -2522,11 +2522,12 @@ static void wacom_wac_pen_report(struct
if (!delay_pen_events(wacom_wac) && wacom_wac->tool[0]) { int id = wacom_wac->id[0]; - if (wacom_wac->features.quirks & WACOM_QUIRK_PEN_BUTTON3 && - wacom_wac->hid_data.barrelswitch & wacom_wac->hid_data.barrelswitch2) { - wacom_wac->hid_data.barrelswitch = 0; - wacom_wac->hid_data.barrelswitch2 = 0; - wacom_wac->hid_data.barrelswitch3 = 1; + if (wacom_wac->features.quirks & WACOM_QUIRK_PEN_BUTTON3) { + int sw_state = wacom_wac->hid_data.barrelswitch | + (wacom_wac->hid_data.barrelswitch2 << 1); + wacom_wac->hid_data.barrelswitch = sw_state == 1; + wacom_wac->hid_data.barrelswitch2 = sw_state == 2; + wacom_wac->hid_data.barrelswitch3 = sw_state == 3; } input_report_key(input, BTN_STYLUS, wacom_wac->hid_data.barrelswitch); input_report_key(input, BTN_STYLUS2, wacom_wac->hid_data.barrelswitch2);