Ok, another try... here's the resullt of the Pi:
pi@raspberrypi ~ $ find /sys/bus/hid/drivers -ls
2947 0 drwxr-xr-x 5 root root 0 sep 10 20:20 /sys/bus/hid/drivers
2950 0 drwxr-xr-x 2 root root 0 sep 10 20:20 /sys/bus/hid/drivers/hid-generic
2953 0 --w------- 1 root root 4096 sep 10 20:20 /sys/bus/hid/drivers/hid-generic/bind
2954 0 --w------- 1 root root 4096 sep 10 20:20 /sys/bus/hid/drivers/hid-generic/new_id
2951 0 --w------- 1 root root 4096 sep 10 20:20 /sys/bus/hid/drivers/hid-generic/uevent
2952 0 --w------- 1 root root 4096 sep 10 20:20 /sys/bus/hid/drivers/hid-generic/unbind
3683 0 drwxr-xr-x 2 root root 0 sep 10 20:20 /sys/bus/hid/drivers/logitech-djreceiver
3718 0 --w------- 1 root root 4096 sep 10 20:20 /sys/bus/hid/drivers/logitech-djreceiver/bind
3713 0 lrwxrwxrwx 1 root root 0 sep 10 20:20 /sys/bus/hid/drivers/logitech-djreceiver/module -> ../../../../module/hid_logitech_dj
3719 0 --w------- 1 root root 4096 sep 10 20:20 /sys/bus/hid/drivers/logitech-djreceiver/new_id
3684 0 lrwxrwxrwx 1 root root 0 sep 10 20:20 /sys/bus/hid/drivers/logitech-djreceiver/0003:046D:C52B.0003 -> ../../../../devices/platform/bcm2708_usb/usb1/1-1/1-1.3/1-1.3:1.2/0003:046D:C52B.0003
3716 0 --w------- 1 root root 4096 sep 10 20:20 /sys/bus/hid/drivers/logitech-djreceiver/uevent
3717 0 --w------- 1 root root 4096 sep 10 20:20 /sys/bus/hid/drivers/logitech-djreceiver/unbind
3720 0 drwxr-xr-x 2 root root 0 sep 10 20:20 /sys/bus/hid/drivers/logitech-djdevice
3725 0 --w------- 1 root root 4096 sep 10 20:20 /sys/bus/hid/drivers/logitech-djdevice/bind
3721 0 lrwxrwxrwx 1 root root 0 sep 10 20:20 /sys/bus/hid/drivers/logitech-djdevice/module -> ../../../../module/hid_logitech_dj
3726 0 --w------- 1 root root 4096 sep 10 20:20 /sys/bus/hid/drivers/logitech-djdevice/new_id
3733 0 lrwxrwxrwx 1 root root 0 sep 10 20:20 /sys/bus/hid/drivers/logitech-djdevice/0003:046D:C52B.0004 -> ../../../../devices/platform/bcm2708_usb/usb1/1-1/1-1.3/1-1.3:1.2/0003:046D:C52B.0003/0003:046D:C52B.0004
4281 0 lrwxrwxrwx 1 root root 0 sep 10 20:20 /sys/bus/hid/drivers/logitech-djdevice/0003:046D:C52B.0005 -> ../../../../devices/platform/bcm2708_usb/usb1/1-1/1-1.3/1-1.3:1.2/0003:046D:C52B.0003/0003:046D:C52B.0005
3723 0 --w------- 1 root root 4096 sep 10 20:20 /sys/bus/hid/drivers/logitech-djdevice/uevent
3724 0 --w------- 1 root root 4096 sep 10 20:20 /sys/bus/hid/drivers/logitech-djdevice/unbind
And the result of the Mint box:
er@desktop ~ $ modprobe usbtouchscreen hid-generic
er@desktop ~ $ find /sys/bus/hid/drivers -ls
16869 0 drwxr-xr-x 3 root root 0 sep 10 20:23 /sys/bus/hid/drivers
16960 0 drwxr-xr-x 2 root root 0 sep 10 20:23 /sys/bus/hid/drivers/hid-generic
17057 0 --w------- 1 root root 4096 sep 10 20:25 /sys/bus/hid/drivers/hid-generic/bind
16961 0 lrwxrwxrwx 1 root root 0 sep 10 20:25 /sys/bus/hid/drivers/hid-generic/0003:413C:3012.0001 -> ../../../../devices/pci0000:00/0000:00:14.0/usb1/1-3/1-3:1.0/0003:413C:3012.0001
17271 0 lrwxrwxrwx 1 root root 0 sep 10 20:25 /sys/bus/hid/drivers/hid-generic/0003:0D62:001C.0002 -> ../../../../devices/pci0000:00/0000:00:14.0/usb1/1-4/1-4:1.0/0003:0D62:001C.0002
17400 0 lrwxrwxrwx 1 root root 0 sep 10 20:25 /sys/bus/hid/drivers/hid-generic/0003:0D62:001C.0003 -> ../../../../devices/pci0000:00/0000:00:14.0/usb1/1-4/1-4:1.1/0003:0D62:001C.0003
17052 0 lrwxrwxrwx 1 root root 0 sep 10 20:25 /sys/bus/hid/drivers/hid-generic/module -> ../../../../module/hid_generic
17058 0 --w------- 1 root root 4096 sep 10 20:25 /sys/bus/hid/drivers/hid-generic/new_id
17055 0 --w------- 1 root root 4096 sep 10 20:23 /sys/bus/hid/drivers/hid-generic/uevent
17056 0 --w------- 1 root root 4096 sep 10 20:25 /sys/bus/hid/drivers/hid-generic/unbind
Again, thanks for all your help Mark!