static ssize_t motor_driver_write(struct file *filep, const char *buffer,size_t len, loff_t *offset){
	int returnVal = 0;
	char numberBuffer[len];
	strcpy(numberBuffer, buffer);
	printk (KERN_INFO "buffer is %s\n", numberBuffer);
	returnVal = kstrtol(numberBuffer, 10, &duty_cycle);
	if (returnVal < 0){
		printk (KERN_ALERT "Kstrtol Failed\n");
		return returnVal;
	}
	printk (KERN_INFO "duty cycle is %ld\n", duty_cycle);
	hrtimer_start(&hr_timer, ktime, HRTIMER_MODE_REL);
	return len;

}