On 3/16/2015 09:55, Jiri Kosina wrote:

On Mon, 16 Mar 2015, Pavel Machek wrote:

quoted

On Mon 2015-03-16 13:55:39, Jiri Kosina wrote:

quoted

On Sat, 14 Mar 2015, Pavel Machek wrote:

quoted

Hi!

After oopsing kernel with ps/3 peripherals, I decided to play some
more.

First "sony motion controller" (part of ps/3 move without the
led). Good news is that it no longer oopses. After pressing the PS
button, it seems to work, but it produces endless stream of events in
evtest:

Event: time 1426360519.967818, type 3 (EV_ABS), code 0 (ABS_X), value 131
Event: time 1426360519.967818, type 3 (EV_ABS), code 1 (ABS_Y), value 129
Event: time 1426360519.967818, type 3 (EV_ABS), code 59 (ABS_MT_DISTANCE), value 513
Event: time 1426360519.967818, type 3 (EV_ABS), code 60 (ABS_MT_TOOL_X), value 513

Should it really produce multitouch events?

Some sony devices are producing multitouch events. You unfortunately
didn't send us the VID/PID of the device you are playing with.

Umm. I thought multitouch events are for touchscreen. This is joystick
with accelerometer...?

Ok, that's USB_DEVICE_ID_SONY_NAVIGATION_CONTROLLER, which should get
SIXAXIS_CONTROLLER_USB. That one shouldn't really be producing multitouch
events.

Could you please add printk()s to hid-sony.c to see how it's possible that
it's generating those?

I am sure Frank will comment on this as well.

The Dualshock 3 is a special case in that every button except for start, 
select and the PS button are both digital and analog.  As such, the 
controller reports 27 axes that end up spilling over into the ABS_MT 
values.  This mapping comes from the default HID descriptor from the 
device, so it's been this way from day 1.  If the navigation controller 
is basically the same as a DS3 then it will have the same issues.

To note, the DS3 only has 20 actual, physical axes meaning that 7 of the 
reported axes don't even do anything and I'm not sure why they are 
there.  The HID descriptor could be rewritten to map everything in a 
more correct manner, but that would break the mapping that has been 
there for 8 or 9 years at this point and probably break some user-space 
applications in the process.