module.txt

嵌入式linux学习之uclinux步进电机驱动实例（测试平台S3C44B0X,uclinux系统）

#include "./ring_buffer/ring.h"
#include <stdlib.h>
#include <stdio.h>

int init_module(void)
{
	int rc;
	ring_buffer_init(&read_buffer);
	ring_buffer_init(&write_buffer);
	read_is_sleeping = 0;
	write_is_sleeping = 0;
	if(register_chrdev(major, "step", &stepper_fops)<0){
		printf("stepper: unable to get major device\n");
		return(-EIO);
	}
	if(check_region(base, 4)){
		printf("stepper: port in use\n");
		unregister_chrdev(major, "step");
		return;
	}
	request_region(base, 4);
	if(irq && (!interrupts_are_enabled)){
		
		rc = request_irq(irq, interrupt_hander, 0, "stepper", NULL);
		if(rc){
			printf("stepper: request irq return %d\n", rc);
		}else{
			printf("stepper: enable irq");
			interrupts_are_enabled = 1;
			word = irq_enable_bit;
			verbose_outb( (word >> 8), base + 2);

		}
	}
	if(!irq){
		using_jiffies = 1;
		queue_task(&tick_queue_entry, &tq_timer);
	}
	xdest = ydest = zdest = 400;
	return(0);
}

void cleanup_module(void)
{
	abort_write = 1;
	if(write_is_sleeping) wake_up_interruptible(&write_wait);
	abort_read = 1;
	if(read_is_sleeping) wake_up_interruptible(&read_wait);


	release_region(base, 4);
	if(unregister_chrdev(major, "step")){
		printf("stepper: unregister_chrdev() failed.\n");
	}
	if(interrupts_are_enable){
		//disable irq on card
		word &= ~irq_enable_bit;
		verbose_outb((word >> 8), base + 2); 
		free_irq(irq, NULL);
	}
	if(using_jiffies){
		sleep_on(&tick_die_wait_queue);
	}
}