nano scroll lock scrolling

keymap.c

#include QMK_KEYBOARD_H

// Dummy
const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {{{KC_NO}}};

void suspend_power_down_user(void) {
    // Switch off sensor + LED making trackball unable to wake host
    adns5050_power_down();
}

void suspend_wakeup_init_user(void) {
    adns5050_init();
}

report_mouse_t pointing_device_task_user(report_mouse_t mouse_report) {
    if (host_keyboard_led_state().scroll_lock) {
        mouse_report.h = mouse_report.y;
        mouse_report.v = mouse_report.x;
        mouse_report.x = 0;
        mouse_report.y = 0;
    }
    return mouse_report;
}