usbduxsigma_pwm_stop
usbduxsigma_pwm_stop(dev, devpriv->pwm_cmd_running);
usbduxsigma_pwm_stop(dev, 0); /* w/o unlink */
usbduxsigma_pwm_stop(dev, 0); /* w/o unlink */
usbduxsigma_pwm_stop(dev, 0); /* w/o unlink */
usbduxsigma_pwm_stop(dev, 1);