text: #ifndef DISABLE_RGB_MATRIX_GRADIENT_UP_DOWN
  RGB_MATRIX_EFFECT(GRADIENT_UP_DOWN)
  #    ifdef RGB_MATRIX_CUSTOM_EFFECT_IMPLS
  
  bool GRADIENT_UP_DOWN(effect_params_t* params) {
      RGB_MATRIX_USE_LIMITS(led_min, led_max);
  
      HSV     hsv   = rgb_matrix_config.hsv;
      uint8_t scale = scale8(64, rgb_matrix_config.speed);
      for (uint8_t i = led_min; i < led_max; i++) {
          RGB_MATRIX_TEST_LED_FLAGS();
          // The y range will be 0..64, map this to 0..4
          // Relies on hue being 8-bit and wrapping
          hsv.h   = rgb_matrix_config.hsv.h + scale * (g_led_config.point[i].y >> 4);
          RGB rgb = hsv_to_rgb(hsv);
          rgb_matrix_set_color(i, rgb.r, rgb.g, rgb.b);
      }
      return led_max < DRIVER_LED_TOTAL;
  }
  
  #    endif  // RGB_MATRIX_CUSTOM_EFFECT_IMPLS
  #endif      // DISABLE_RGB_MATRIX_GRADIENT_UP_DOWN
  