Librem 14- What kernel config options for the touchpad?

Hardware
1

So my Librem 14 finally arrived yesterday and I’ve been getting Gentoo installed. Currently I’m trying to get my touchpad to work properly.

I know that mice in general function since I can hook up a USB mouse with the kernel I built and it works fine. I know that the touchpad itself functions, since it works when I use the kernel from the PureOS repo. However I’m not getting a device for it under /dev/input when using the kernel I built.

I attempted to just set every option under Device Drivers > Input device support > Mice as a module but none of them loaded except psmouse, but that didn’t enable the touchpad. Are there additional kernel settings that must be set to get it to recognize the touchpad?

1 Like
2

Hello!

I don’t know the answer but in a PureOS installation there is probably a file called something like /boot/config-5.11.0-22-generic or similar, you could look in that file to see all kernel settings that were used when the PureOS kernel was built.

3

The touchpad is I2C HID compliant, so these are the drivers needed, no manufacturer specific drivers.

Symbol: I2C_HID [=m]                                                                                                                                                │  
  │ Type  : tristate                                                                                                                                                    │  
  │ Defined at drivers/hid/i2c-hid/Kconfig:5                                                                                                                            │  
  │   Prompt: HID over I2C transport layer                                                                                                                              │  
  │   Depends on: I2C [=y] && INPUT [=y]                                                                                                                                │  
  │   Location:                                                                                                                                                         │  
  │     -> Device Drivers                                                                                                                                               │  
  │       -> HID support                                                                                                                                                │  
  │ (1)     -> I2C HID support                                                                                                                                          │  
  │ Selects: HID [=m]

Cheers
nicole

3 Likes
4

It seems that i2c_designware_core and i2c_designware_platform modules (CONFIG_I2C_DESIGNWARE_CORE, CONFIG_I2C_DESIGNWARE_PLATFORM) are also needed as well as I2C_HID:

$ dmesg | grep i2c
[ 8.006633] i2c i2c-0: 1/1 memory slots populated (from DMI)
[ 8.516933] input: HTIX5288:00 0911:5288 Mouse as /devices/pci0000:00/0000:00:15.0/i2c_designware.0/i2c-8/i2c-HTIX5288:00/0018:0911:5288.0001/input/input9
[ 8.517264] input: HTIX5288:00 0911:5288 Touchpad as /devices/pci0000:00/0000:00:15.0/i2c_designware.0/i2c-8/i2c-HTIX5288:00/0018:0911:5288.0001/input/input10
[ 8.517699] hid-generic 0018:0911:5288.0001: input,hidraw0: I2C HID v1.00 Mouse [HTIX5288:00 0911:5288] on i2c-HTIX5288:00
[ 8.966800] input: HTIX5288:00 0911:5288 Mouse as /devices/pci0000:00/0000:00:15.0/i2c_designware.0/i2c-8/i2c-HTIX5288:00/0018:0911:5288.0001/input/input16
[ 8.966900] input: HTIX5288:00 0911:5288 Touchpad as /devices/pci0000:00/0000:00:15.0/i2c_designware.0/i2c-8/i2c-HTIX5288:00/0018:0911:5288.0001/input/input17
[ 8.966954] hid-multitouch 0018:0911:5288.0001: input,hidraw0: I2C HID v1.00 Mouse [HTIX5288:00 0911:5288] on i2c-HTIX5288:00

$ lsmod | grep i2c
i2c_designware_platform 16384 0
i2c_designware_core 36864 1 i2c_designware_platform
i2c_i801 32768 0
i2c_smbus 20480 1 i2c_i801
i2c_hid_acpi 16384 0
i2c_hid 32768 1 i2c_hid_acpi

At least for me the touchpad worked only after I set all these options.