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

• analog_a : joybus_gc_controller_input
• analog_b : joybus_gc_controller_input
• base : joybus_gc_controller
• buttons : joybus_gc_controller_input, joybus_n64_controller_input
• byte_received : joybus_target_api
• id : joybus_n64_controller
• input : joybus_gc_controller, joybus_n64_controller
• input_valid : joybus_gc_controller
• on_motor_state_change : joybus_gc_controller
• on_reset : joybus_gc_controller, joybus_n64_controller
• origin : joybus_gc_controller
• packed_input : joybus_gc_controller
• stick_x : joybus_gc_controller_input, joybus_n64_controller_input
• stick_y : joybus_gc_controller_input, joybus_n64_controller_input
• substick_x : joybus_gc_controller_input
• substick_y : joybus_gc_controller_input
• trigger_left : joybus_gc_controller_input
• trigger_right : joybus_gc_controller_input