面向对象之编写驱动程序--中断（linux系统、s3c6410开发板）

/*-------------------------

*先申明下，本人是个菜鸟，刚开始接触驱动程序编写，交代下开发环境（主机系统redhat6.3,开发板ARM-s3c6410）

以watchdog (看门狗，俗称狗中断）为例，编写简单的中断（驱动）

-------------------------*/

#include <linux/init.h>

#include

#include

#include

#include

#include

#include

MODULE_LICENSE('GPL');

MODULE_AUTHOR('cheng');

typedef struct mydev{

        unsigned long gpio_virt;

        unsigned long wdt_virt;

        unsigned long *gpmcon, *gpmdat;

        unsigned long *wtcon, *wtdat, *wtcnt, *wtclrint;

        void (*init_nydev)(struct mydev *this);

        void (*exit_mydev)(struct mydev *this);

        irqreturn_t (*do_irq)(int irq, struct mydev *this);

        void (*led_on)(struct mydev *this);

        void (*led_off)(struct mydev *this);

        void (*wdt_on)(struct mydev *this);

        void (*wdt_off)(struct mydev *this);

}MYDEV;

void my_init_mydev(struct mydev *this);

void my_exit_mydev(struct mydev *this);

irqreturn_t my_do_irq(int irq, struct mydev *this);

void my_led_on(struct mydev *this);

void my_led_off(struct mydev *this);

void my_wdt_on(struct mydev *this);

void my_wdt_off(struct mydev *this);

MYDEV my ;

static int test_init(void)

{

    printk('hello,in my test_initn');

    my.init_mydev = my_init_mydev;

    my.exit_mydev = my_exit_mydev;

    my.init_mydev(&my);

    return 0;

}

void test_exit()

{

    my.exit_mydev(&my);

    printk('this is test exitn');

}

module_init(test_init);

module_exit(test_exit);

void my_init_mydev(struct mydev *this)

{

        this->do_irq   = my_do_irq;

        this->led_on   = my_led_on;

        this->led_off   = my_led_off;

        this->wdt_on  = my_wdt_on;

        this->wdt_off  = my_wdt_off;

        int ret = request_irq(IRQ_WDT, this->do_irq, IRQF_SHARED,'hello', this);

        if(ret < 0){

                printk('request_irq errorn');

                return ;

        }

        this->gpio_virt   =    ioremap(0x7f008000, SZ_4K);

        this->wdt_virt     =    ioremap(0x7e004000, SZ_4K);

        this->gpmcon    =    this->gpio_virt + 0x820;

        this->gpmdat     =    this->gpio_virt + 0x824;

        this->wtcon        =    this->wdt_virt + 0x00;

        this->wtdat         =    this->wdt_virt + 0x04;

        this->wtcnt         =    this->wdt_virt + 0x08;

        this->wtclrint      =    this->wdt_virt + 0x0c;

        this->wdt_on(this);

}

void my_exit_mydev(struct mydev *this)

{

    this->my_wtd_off(this);

    iounmap(this->wdt_virt);

    iounmap(this->gpio_virt);

    free_irq(IRQ_WDT,this);

}

irqreturn_t my_do_irq(int irq, struct mydev *this)

{

    if(irq == IRQ_WDT){

        *this->wtclrint = 0;

        printk('wang wang wangn');

        static int flag = 1;

        if(flag)

            this->led_on(this);

        else

            this->led_off(this);

       flag ^= 1;

    }

    return IRQ_HANDLED;

}

void my_led_on(struct mydev *this)

{

    *this->gpmcon = 1;

    *this->gpmdat = 0;

}

void my_led_off(struct mydev *this)

{

    *this->gpmcon = 1;

    *this->gpmdat = 1;

}

void my_wdt_on(struct mydev *this)

{

    *this->wtcon = (1 << 2) | (1 << 3) | (1 << 5) | (31 << 8);

    *this->wtdat = 0x4000;

    *this->wtcnt = 0x8000;

}

void my_wdt_off(struct mydev *this)

{

    *this->wtcon = 0;

}

/*

    下面是makefile内容：

*/

all:

        make -C linux-2.6.28_smdk6410 M=`pwd` modules

clean:

        make -C /linux-2.6.28_smdk6410 M=`pwd` clean

        rm -rf modules.order

obj-m += test.o