The function to disable/enable the trackball

[CHBrianLiu]

Hi team!

I am looking for functions to disable and enable the trackball feature. The idea is to disable the trackball in layers other than mouse, and enable it when in mouse layer.
Currently, I use keyball_set_cpi(1) to make the sensitivity to the lowest value allowed, but it would be great if I can disable it completely.

Current workaround

layer_state_t layer_state_set_user(layer_state_t state) {
    // when not in the mouse layer, make trackball as slow as possible.
    // change back to default once back to the mouse layer.
    if (IS_LAYER_ON_STATE(state, mouse)) {
        // based on the code, set the cpi to 0 will be the default value.
        keyball_set_cpi(0);
    } else {
        keyball_set_cpi(1);
    }
    return state;
}

void keyboard_post_init_user(void) {
    // initialize with the minimum trackball cpi to indicate it's not in the mouse layer
    keyball_set_cpi(1);
}