简单的MINI2440外部中断按键

key.c

#include <linux/kernel.h>
#include <linux/fs.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/poll.h>
#include <linux/irq.h>
#include <asm/irq.h>
#include <linux/interrupt.h>
#include <asm/uaccess.h>
#include <mach/regs-gpio.h>
#include <mach/hardware.h>
#include <linux/platform_device.h>
#include <linux/cdev.h>
#include <linux/miscdevice.h>
#include <linux/sched.h>
#include <linux/gpio.h>
#include <linux/mm.h>
#include <linux/ioport.h>
#include <linux/io.h>

struct irq_type
{
    int irq;
    char *name;
    int number;
};

    unsigned int *addr;
static struct irq_type key_irq[] =
{
    {IRQ_EINT8,"key0",0},
    {IRQ_EINT11,"key1",1},
    {IRQ_EINT13,"key2",2},
    {IRQ_EINT14,"key3",3},
    {IRQ_EINT15,"key4",4},
    {IRQ_EINT19,"key5",5},
};

static irqreturn_t key_handler(int irq,void *dev_id)
{
    unsigned int data = ioread32(addr);
    printk("<1> the read data is %d",data);
    struct irq_type *nirq = (struct irq_type *)(dev_id);
    switch(nirq->number)
    {
        case 0:
            printk("<1> the key 0 ");
            break;
        case 1:
            printk("<1> the key 1 ");
            break;
        case 2:
            printk("<1> the key 2 ");
            break;
        case 3:
            printk("<1> the key 3 ");
            break;
        case 4:
            printk("<1> the key 4 ");
            break;
        case 5:
            printk("<1> the key 5 ");
            break;

    }

    return 0;
}


int my_key_init(void)
{
    addr = ioremap(0x56000064,4);
    int i;
    int ret;
    for(i = 0;i < 6 ;i ++)
    {
        ret = request_irq(key_irq[i].irq,key_handler,IRQ_TYPE_EDGE_BOTH,key_irq[i].name,(void *)&(key_irq[i]));
        if(ret)
            goto out;
        printk("<1>request irq %d",i);
    }

    return 0;
out:
    printk("<1>this is out of key_init!!!!!!!!!!");
    //free_irq();
    return -1;
}

void my_key_exit()
{
    printk("<1> exit of the module!!!!!!!!!!!!!!!!");
}


MODULE_AUTHOR("more&high");
MODULE_LICENSE("Dual BSD/GPL");
module_init(my_key_init);
module_exit(my_key_exit);

Makefile

obj-m:=key.o
KERNELDIR:=/work/coding/linux-2.6.32.10
PWD:=$(shell pwd)
modules:
$(MAKE) -C $(KERNELDIR) M=$(PWD) ARCH=arm CROSS_COMPILE=arm-linux-
#$(MAKE) -C $(KERNELDIR) M=$(PWD) ARCH=i386 CROSS_COMPILE=

clean:
rm *.o *mod.o *.order *.mod.c *symvers -f

结果

the read data is 47327
the key 2
the read data is 47359
the key 2
the read data is 47351
the key 1
the read data is 47359
the key 1
the read data is 47358
the key 0
the read data is 47359