Here is a list of all documented variables with links to the struct/union documentation for each field:

build : mtb_touchpad_fw_ver_t
bus_read : mtb_touchpad_intf_context_t
bus_write : mtb_touchpad_intf_context_t
intf_ptr : mtb_touchpad_intf_context_t
major : mtb_touchpad_fw_ver_t
minor : mtb_touchpad_fw_ver_t
num_sensors : mtb_touchpad_intf_context_t
num_touch : mtb_touchpad_pos_t
tch0 : mtb_touchpad_pos_t
tch1 : mtb_touchpad_pos_t
x : mtb_touchpad_coordinates
y : mtb_touchpad_coordinates
z : mtb_touchpad_coordinates