After working out the symptoms of a problem I was having using my
scroll mouse with my KVM switch when running 2.6 kernels, I made this
patch which fixes the problem for me. I think it would be useful to
have this in the kernel, especially since it has other uses too.
I have a Logitech mouse with a scroll wheel that 2.6 kernels
detect as supporting the Logitech ps2++ protocol, and enable it as
such. My KVM switch supports only the Microsoft imps2 protocol for
using the scroll wheel, so after switching away from a box running a
2.6 kernel and back again, my scroll wheel no longer works; evbug
doesn't see any mouse events at all when I turn the scroll wheel.
2.4 (and Windows) don't have this problem because they use imps2
drivers, which my mouse is compatible with. So the appended patch
creates a new module/boot parameter, psmouse_imps2, largely copied
=66rom psmouse_noext. With the option, the mouse detection is limited
to only the base ps2 protocol and the imps2 extensions, my mouse is
detected as a generic imps/2 device, and the scroll wheel works
properly again.
I've been using this patch for about a month. I've since seen
another use for this parameter; with it it is possible to disable the
synaptics touchpad driver and still use an external imps2 mouse.
I'm not sure if short-circuiting the mouse detection this way
might leave some mice wedged, or cause them to be improperly detected
though. Do the tests for imps/2 mice depend on any of the commands in
the detection this patch skips to initialize the mouse somehow?
This patch is against -test4; it applies to -test4-mm4 with
offsets (I'm running -mm4). More than half the length of the patch is
indentation. Is there a possibility of getting this applied?
Documentation/kernel-parameters.txt | 2
drivers/input/mouse/psmouse-base.c | 112 +++++++++++++++++++-----------------
2 files changed, 64 insertions(+), 50 deletions(-)
diff -puN Documentation/kernel-parameters.txt~psmouse_ipms2-option Documentation/kernel-parameters.txt
--- 25/Documentation/kernel-parameters.txt~psmouse_ipms2-option 2003-09-21 14:01:10.000000000 -0700
+++ 25-akpm/Documentation/kernel-parameters.txt 2003-09-21 14:01:10.000000000 -0700
@@ -786,6 +786,8 @@ running once the system is up.
before loading.
See Documentation/ramdisk.txt.
+ psmouse_imps2 [HW,MOUSE] Probe only for Intellimouse PS2 mouse protocol extensions
+
psmouse_noext [HW,MOUSE] Disable probing for PS2 mouse protocol extensions
psmouse_resetafter=
diff -puN drivers/input/mouse/psmouse-base.c~psmouse_ipms2-option drivers/input/mouse/psmouse-base.c
--- 25/drivers/input/mouse/psmouse-base.c~psmouse_ipms2-option 2003-09-21 14:01:10.000000000 -0700
+++ 25-akpm/drivers/input/mouse/psmouse-base.c 2003-09-21 14:01:10.000000000 -0700
@@ -24,6 +24,8 @@
MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>");
MODULE_DESCRIPTION("PS/2 mouse driver");
+MODULE_PARM(psmouse_imps2, "1i");
+MODULE_PARM_DESC(psmouse_imps2, "Limit protocol extensions to the Intellimouse protocol.");
MODULE_PARM(psmouse_noext, "1i");
MODULE_PARM_DESC(psmouse_noext, "Disable any protocol extensions. Useful for KVM switches.");
MODULE_PARM(psmouse_resolution, "i");
@@ -36,6 +38,7 @@ MODULE_LICENSE("GPL");
#define PSMOUSE_LOGITECH_SMARTSCROLL 1
+static int psmouse_imps2;
static int psmouse_noext;
int psmouse_resolution;
int psmouse_smartscroll = PSMOUSE_LOGITECH_SMARTSCROLL;
@@ -272,66 +275,68 @@ static int psmouse_extensions(struct psm
if (psmouse_noext)
return PSMOUSE_PS2;
-/*
- * Try Synaptics TouchPad magic ID
- */
-
- param[0] = 0;
- psmouse_command(psmouse, param, PSMOUSE_CMD_SETRES);
- psmouse_command(psmouse, param, PSMOUSE_CMD_SETRES);
- psmouse_command(psmouse, param, PSMOUSE_CMD_SETRES);
- psmouse_command(psmouse, param, PSMOUSE_CMD_SETRES);
- psmouse_command(psmouse, param, PSMOUSE_CMD_GETINFO);
+ if (!psmouse_imps2) {
- if (param[1] == 0x47) {
- psmouse->vendor = "Synaptics";
- psmouse->name = "TouchPad";
- if (!synaptics_init(psmouse))
- return PSMOUSE_SYNAPTICS;
- else
- return PSMOUSE_PS2;
- }
+ /*
+ * Try Synaptics TouchPad magic ID
+ */
-/*
- * Try Genius NetMouse magic init.
- */
+ param[0] = 0;
+ psmouse_command(psmouse, param, PSMOUSE_CMD_SETRES);
+ psmouse_command(psmouse, param, PSMOUSE_CMD_SETRES);
+ psmouse_command(psmouse, param, PSMOUSE_CMD_SETRES);
+ psmouse_command(psmouse, param, PSMOUSE_CMD_SETRES);
+ psmouse_command(psmouse, param, PSMOUSE_CMD_GETINFO);
+
+ if (param[1] == 0x47) {
+ psmouse->vendor = "Synaptics";
+ psmouse->name = "TouchPad";
+ if (!synaptics_init(psmouse))
+ return PSMOUSE_SYNAPTICS;
+ else
+ return PSMOUSE_PS2;
+ }
- param[0] = 3;
- psmouse_command(psmouse, param, PSMOUSE_CMD_SETRES);
- psmouse_command(psmouse, NULL, PSMOUSE_CMD_SETSCALE11);
- psmouse_command(psmouse, NULL, PSMOUSE_CMD_SETSCALE11);
- psmouse_command(psmouse, NULL, PSMOUSE_CMD_SETSCALE11);
- psmouse_command(psmouse, param, PSMOUSE_CMD_GETINFO);
+ /*
+ * Try Genius NetMouse magic init.
+ */
- if (param[0] == 0x00 && param[1] == 0x33 && param[2] == 0x55) {
+ param[0] = 3;
+ psmouse_command(psmouse, param, PSMOUSE_CMD_SETRES);
+ psmouse_command(psmouse, NULL, PSMOUSE_CMD_SETSCALE11);
+ psmouse_command(psmouse, NULL, PSMOUSE_CMD_SETSCALE11);
+ psmouse_command(psmouse, NULL, PSMOUSE_CMD_SETSCALE11);
+ psmouse_command(psmouse, param, PSMOUSE_CMD_GETINFO);
- set_bit(BTN_EXTRA, psmouse->dev.keybit);
- set_bit(BTN_SIDE, psmouse->dev.keybit);
- set_bit(REL_WHEEL, psmouse->dev.relbit);
+ if (param[0] == 0x00 && param[1] == 0x33 && param[2] == 0x55) {
- psmouse->vendor = "Genius";
- psmouse->name = "Wheel Mouse";
- return PSMOUSE_GENPS;
- }
+ set_bit(BTN_EXTRA, psmouse->dev.keybit);
+ set_bit(BTN_SIDE, psmouse->dev.keybit);
+ set_bit(REL_WHEEL, psmouse->dev.relbit);
-/*
- * Try Logitech magic ID.
- */
+ psmouse->vendor = "Genius";
+ psmouse->name = "Wheel Mouse";
+ return PSMOUSE_GENPS;
+ }
- param[0] = 0;
- psmouse_command(psmouse, param, PSMOUSE_CMD_SETRES);
- psmouse_command(psmouse, NULL, PSMOUSE_CMD_SETSCALE11);
- psmouse_command(psmouse, NULL, PSMOUSE_CMD_SETSCALE11);
- psmouse_command(psmouse, NULL, PSMOUSE_CMD_SETSCALE11);
- param[1] = 0;
- psmouse_command(psmouse, param, PSMOUSE_CMD_GETINFO);
+ /*
+ * Try Logitech magic ID.
+ */
- if (param[1]) {
- int type = ps2pp_detect_model(psmouse, param);
- if (type)
- return type;
+ param[0] = 0;
+ psmouse_command(psmouse, param, PSMOUSE_CMD_SETRES);
+ psmouse_command(psmouse, NULL, PSMOUSE_CMD_SETSCALE11);
+ psmouse_command(psmouse, NULL, PSMOUSE_CMD_SETSCALE11);
+ psmouse_command(psmouse, NULL, PSMOUSE_CMD_SETSCALE11);
+ param[1] = 0;
+ psmouse_command(psmouse, param, PSMOUSE_CMD_GETINFO);
+
+ if (param[1]) {
+ int type = ps2pp_detect_model(psmouse, param);
+ if (type)
+ return type;
+ }
}
-
/*
* Try IntelliMouse magic init.
*/
@@ -614,6 +619,12 @@ static struct serio_dev psmouse_dev = {
};
#ifndef MODULE
+static int __init psmouse_imps2_setup(char *str)
+{
+ psmouse_imps2 = 1;
+ return 1;
+}
+
static int __init psmouse_noext_setup(char *str)
{
psmouse_noext = 1;
@@ -638,6 +649,7 @@ static int __init psmouse_resetafter_set
return 1;
}
+__setup("psmouse_imps2", psmouse_imps2_setup);
__setup("psmouse_noext", psmouse_noext_setup);
__setup("psmouse_resolution=", psmouse_resolution_setup);
__setup("psmouse_smartscroll=", psmouse_smartscroll_setup);
_