Вот на работающем тачпаде:
# grep -rHi touchpad /sys/devices 2>/dev/null
/sys/devices/platform/i8042/serio2/input/input14/uevent:NAME="SynPS/2 Synaptics TouchPad"
/sys/devices/platform/i8042/serio2/input/input14/name:SynPS/2 Synaptics TouchPad
# cat /sys/devices/platform/i8042/serio2/input/input14/device/protocol
SynPS/2
# cat /sys/devices/platform/i8042/serio2/input/input14/device/driver/description
PS/2 mouse driver
# modinfo psmouse | grep '^file\|^desc'
filename: /lib/modules/4.9.63-std-def-alt0.M80P.1/kernel/drivers/input/mouse/psmouse.ko
description: PS/2 mouse driver
# modinfo /lib/modules/4.9.63-std-def-alt0.M80P.1/kernel/drivers/input/mouse/*.ko|grep '^file\|^desc'
filename: /lib/modules/4.9.63-std-def-alt0.M80P.1/kernel/drivers/input/mouse/appletouch.ko
description: Apple PowerBook and MacBook USB touchpad driver
filename: /lib/modules/4.9.63-std-def-alt0.M80P.1/kernel/drivers/input/mouse/bcm5974.ko
description: Apple USB BCM5974 multitouch driver
filename: /lib/modules/4.9.63-std-def-alt0.M80P.1/kernel/drivers/input/mouse/cyapatp.ko
description: Cypress APA I2C Trackpad Driver
filename: /lib/modules/4.9.63-std-def-alt0.M80P.1/kernel/drivers/input/mouse/elan_i2c.ko
description: Elan I2C/SMBus Touchpad driver
filename: /lib/modules/4.9.63-std-def-alt0.M80P.1/kernel/drivers/input/mouse/gpio_mouse.ko
description: GPIO mouse driver
filename: /lib/modules/4.9.63-std-def-alt0.M80P.1/kernel/drivers/input/mouse/psmouse.ko
description: PS/2 mouse driver
filename: /lib/modules/4.9.63-std-def-alt0.M80P.1/kernel/drivers/input/mouse/sermouse.ko
description: Serial mouse driver
filename: /lib/modules/4.9.63-std-def-alt0.M80P.1/kernel/drivers/input/mouse/synaptics_i2c.ko
description: Synaptics I2C touchpad driver
filename: /lib/modules/4.9.63-std-def-alt0.M80P.1/kernel/drivers/input/mouse/synaptics_usb.ko
description: Synaptics USB device driver
filename: /lib/modules/4.9.63-std-def-alt0.M80P.1/kernel/drivers/input/mouse/vsxxxaa.ko
description: Driver for DEC VSXXX-AA and -GA mice and VSXXX-AB tablet
# modinfo /lib/modules/4.9.63-std-def-alt0.M80P.1/kernel/drivers/input/mouse/psmouse.ko|grep -v '^\.'|grep detect
# modinfo /lib/modules/4.9.63-std-def-alt0.M80P.1/kernel/drivers/input/mouse/psmouse.ko|grep 'ETPS\/2\|SynPS\/2'
#