Hello,
I'm trying to make a touchpad from a Dell Inspiron I14-3442 laptop work.
Some details:
- I'm using plain Slackware64 14.1, but raised the kernel to 3.16.3 for
tests
- xinput ignores the touchpad; it shows only a USB mouse/keyboard
adapter and the laptop's keyboard:
root@pace:/sys/bus/hid/devices# xinput
Virtual core pointer id=2 [master pointer
(3)]
Virtual core XTEST pointer id=4 [slave
pointer (2)]
Generic USB K/B id=12 [slave
pointer (2)]
Virtual core keyboard id=3 [master
keyboard (2)]
Virtual core XTEST keyboard id=5 [slave
keyboard (3)]
Power Button id=6 [slave
keyboard (3)]
Video Bus id=7 [slave
keyboard (3)]
Power Button id=9 [slave
keyboard (3)]
Sleep Button id=10 [slave
keyboard (3)]
Integrated_Webcam_HD id=13 [slave
keyboard (3)]
AT Translated Set 2 keyboard id=14 [slave
keyboard (3)]
Dell WMI hotkeys id=15 [slave
keyboard (3)]
Video Bus id=8 [slave
keyboard (3)]
Generic USB K/B id=11 [slave
keyboard (3)]
- it seems Ubuntu certified this machine (check
http://www.ubuntu.com/certification/hardware/201402-14674/components/),
but it assumes the touchpad is PS/2. I haven't found it as a PS/2 thing,
even loading psmouse.ko, or doing other tricks
- some articles lists some tips for making it work (like
http://askubuntu.com/questions/134627/how-do-i-get-the-touchpad-settings-working-on-a-dell-xps-13-ultrabook,
or https://bugzilla.redhat.com/show_bug.cgi?id=1048314#c2), but I read
them carefully, made some tests, and they didn't work. One article says
I could blacklist i2c_hid or like in order to make the bring up the
touchpad in PS/2 mode, but I couldn't succeed doing so
- at Dell's site, it is offered a driver for Ubuntu 12.04, but it's
almost obsolete. It seems to be just merged into the kernel
- from Windows 8.1, which runs in the same machine (dual boot), I
concluded the proper way of making it work is to use HID over I2C. It
seems that there are two components loaded; one I2CHID, and a Synaptics
HID. This makes me hint it may be a Synaptics device
- it seems there are two I2C busses in the machine. One is related to
the Intel video graphics subsystem (i801). The other seems to be linked
to the touchpad (i2c_designware_platform). I'm not sure that latest kmod
(i2c_designware_platform) is the right one to be used in this case, but
it appears to be working:
root@pace:/sys/bus/i2c/devices# ls -l /sys/bus/i2c/devices
total 0
lrwxrwxrwx 1 root root 0 Out 18 17:26 i2c-0 ->
../../../devices/pci0000:00/INT33C2:00/i2c-0
lrwxrwxrwx 1 root root 0 Out 18 17:26 i2c-1 ->
../../../devices/pci0000:00/INT33C3:00/i2c-1
lrwxrwxrwx 1 root root 0 Out 18 17:26 i2c-2 ->
../../../devices/pci0000:00/0000:00:02.0/i2c-2
lrwxrwxrwx 1 root root 0 Out 18 17:26 i2c-3 ->
../../../devices/pci0000:00/0000:00:02.0/i2c-3
lrwxrwxrwx 1 root root 0 Out 18 17:26 i2c-4 ->
../../../devices/pci0000:00/0000:00:02.0/i2c-4
lrwxrwxrwx 1 root root 0 Out 18 17:26 i2c-5 ->
../../../devices/pci0000:00/0000:00:02.0/i2c-5
lrwxrwxrwx 1 root root 0 Out 18 17:26 i2c-6 ->
../../../devices/pci0000:00/0000:00:02.0/i2c-6
lrwxrwxrwx 1 root root 0 Out 18 17:26 i2c-7 ->
../../../devices/pci0000:00/0000:00:02.0/i2c-7
lrwxrwxrwx 1 root root 0 Out 18 17:26 i2c-8 ->
../../../devices/pci0000:00/0000:00:02.0/i2c-8
lrwxrwxrwx 1 root root 0 Out 18 17:26 i2c-DLL0652:00 ->
../../../devices/pci0000:00/INT33C3:00/i2c-1/i2c-DLL0652:00
root@pace:/sys/bus/i2c/devices# lsmod | grep i2c
i2c_hid 10682 0
hid 94632 3 i2c_hid,hid_generic,usbhid
i2c_dev 5739 0
i2c_designware_platform 3189 0
i2c_i801 13732 0
i2c_designware_core 6045 1 i2c_designware_platform
i2c_algo_bit 5351 1 i915
i2c_core 35216 11
drm,i915,i2c_i801,i2c_dev,i2c_hid,i2c_designware_platform,drm_kms_helper,i2c_algo_bit,v4l2_common,synaptics_i2c,videodev
- in the HID /sys directory, there are three devices. Two are related to
a keyboard/mouse USB adapter. The third seems to be the linked to the
touchpad:
root@pace:/sys/bus/hid/devices# ls -l /sys/bus/hid/devices
total 0
lrwxrwxrwx 1 root root 0 Out 28 22:40 0003:13BA:0017.004F ->
../../../devices/pci0000:00/0000:00:1d.0/usb3/3-1/3-1.3/3-1.3:1.0/0003:13BA:0017.004F
lrwxrwxrwx 1 root root 0 Out 28 22:40 0003:13BA:0017.0050 ->
../../../devices/pci0000:00/0000:00:1d.0/usb3/3-1/3-1.3/3-1.3:1.1/0003:13BA:0017.0050
lrwxrwxrwx 1 root root 0 Out 28 22:40 0018:06CB:2985.0052 ->
../../../devices/pci0000:00/INT33C3:00/i2c-1/i2c-DLL0652:00/0018:06CB:2985.0052
- when I load the kernel module i2c-hid.ko (with debug=1), I read this
in dmesg:
[146172.568787] i2c_hid i2c-DLL0652:00: Fetching the HID descriptor
[146172.568791] i2c_hid i2c-DLL0652:00: __i2c_hid_command: cmd=20 00
[146172.574806] i2c_hid i2c-DLL0652:00: HID Descriptor: 1e 00 00 01 85
00 21 00 24 00 20 00 25 00 17 00 22 00 23 00 cb 06 85 29 00 00 00 00 00
00
[146172.574845] i2c_hid i2c-DLL0652:00: entering i2c_hid_parse
[146172.574847] i2c_hid i2c-DLL0652:00: i2c_hid_hwreset
[146172.574849] i2c_hid i2c-DLL0652:00: i2c_hid_set_power
[146172.574850] i2c_hid i2c-DLL0652:00: __i2c_hid_command: cmd=22 00 00
08
[146172.575436] i2c_hid i2c-DLL0652:00: resetting...
[146172.575442] i2c_hid i2c-DLL0652:00: __i2c_hid_command: cmd=22 00 00
01
[146172.576113] i2c_hid i2c-DLL0652:00: __i2c_hid_command: waiting...
[146172.577414] i2c_hid i2c-DLL0652:00: __i2c_hid_command: finished.
[146172.577417] i2c_hid i2c-DLL0652:00: asking HID report descriptor
[146172.577419] i2c_hid i2c-DLL0652:00: __i2c_hid_command: cmd=21 00
[146172.581072] i2c_hid i2c-DLL0652:00: Report Descriptor: 05 01 09 02
a1 01 85 01 09 01 a1 00 05 09 19 01 29 02 15 00 25 01 75 01 95 02 81 02
95 06 81 01 05 01 09 30 09 31 15 81 25 7f 75 08 95 02 81 06 c0 c0 06 00
ff 09 01 a1 01 85 09 09 02 15 00 26
[146172.581126] i2c_hid i2c-DLL0652:00: i2c_hid_set_power
[146172.581129] i2c_hid i2c-DLL0652:00: __i2c_hid_command: cmd=22 00 01
08
I am aware this information probably is not sufficient to draw any
conclusions, but I'd appreciate to hear from someone who knows i2c_hid
in detail what steps I should take next. For me the last command timed
out or got stuck, but I haven't checked the code to see if it's the
case. Anyway, if it was a timeout case, it should have something logged
after the time expired.
I have some programming skills, and so if it's the case of applying any
patches, or recompiling the kernel or any subsystem to make tests, I'm
up to.
Many thanks,
Luiz Ramos
lramos dot prof at yahoo dot com dot br
São Paulo - Brazil
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