Object-oriented driver programming - interrupt (linux system, s3c6410 development board)

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

*First of all, I am a novice and just started to write driver programs. I will explain the development environment (host system redhat6.3, development board ARM-s3c6410)

Take watchdog (commonly known as dog interrupt) as an example to write a simple interrupt (driver)

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

#include

#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;

}

/*

Here is the Makefile content:

*/

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