From: Aaron Ma Date: Fri, 19 Jan 2018 17:43:39 +0000 (-0800) Subject: Input: trackpoint - force 3 buttons if 0 button is reported X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?p=pandora-kernel.git;a=commitdiff_plain;h=a75a6c8641e59892466fee830fc9f4d502357a8c Input: trackpoint - force 3 buttons if 0 button is reported commit f5d07b9e98022d50720e38aa936fc11c67868ece upstream. Lenovo introduced trackpoint compatible sticks with minimum PS/2 commands. They supposed to reply with 0x02, 0x03, or 0x04 in response to the "Read Extended ID" command, so we would know not to try certain extended commands. Unfortunately even some trackpoints reporting the original IBM version (0x01 firmware 0x0e) now respond with incorrect data to the "Get Extended Buttons" command: thinkpad_acpi: ThinkPad BIOS R0DET87W (1.87 ), EC unknown thinkpad_acpi: Lenovo ThinkPad E470, model 20H1004SGE psmouse serio2: trackpoint: IBM TrackPoint firmware: 0x0e, buttons: 0/0 Since there are no trackpoints without buttons, let's assume the trackpoint has 3 buttons when we get 0 response to the extended buttons query. Signed-off-by: Aaron Ma Fixes: https://bugzilla.kernel.org/show_bug.cgi?id=196253 Signed-off-by: Dmitry Torokhov [bwh: Backported to 3.2: use printk() instead of psmouse_warn()] Signed-off-by: Ben Hutchings --- diff --git a/drivers/input/mouse/trackpoint.c b/drivers/input/mouse/trackpoint.c index 5d4dde2772b4..46c614558b2f 100644 --- a/drivers/input/mouse/trackpoint.c +++ b/drivers/input/mouse/trackpoint.c @@ -300,6 +300,9 @@ int trackpoint_detect(struct psmouse *psmouse, bool set_properties) if (trackpoint_read(&psmouse->ps2dev, TP_EXT_BTN, &button_info)) { printk(KERN_WARNING "trackpoint.c: failed to get extended button data, assuming 3 buttons\n"); button_info = 0x33; + } else if (!button_info) { + printk(KERN_WARNING "trackpoint.c: got 0 in extended button data, assuming 3 buttons\n"); + button_info = 0x33; } psmouse->private = kzalloc(sizeof(struct trackpoint_data), GFP_KERNEL);