jz2440 的中斷中的底半部機制

改的別人的代碼，稍微拓展了一下。主要是運用tasklet和工作隊列兩種方法。

tasklet的代碼

 #include <linux/module.h>
#include <linux/kernel.h>
#include <linux/fs.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/irq.h>
#include <asm/uaccess.h>
#include <asm/irq.h>
#include <asm/io.h>
#include <asm/arch/regs-gpio.h>
#include <asm/hardware.h>
#include<linux/interrupt.h>   /*這個頭文件是必須加的 和這個函數 DECLARE_TASKLET有關*/

static struct class *thirddrv_class;
static struct class_device	*thirddrv_class_dev;

/*一般就這麼寫*/
void key_do_tasklet(unsigned long );
DECLARE_TASKLET(key_tasklet,key_do_tasklet,0);

/*底半部真正的處理函數*/
void key_do_tasklet(unsigned long date)  /*這裏需要一個參數*/
{
	printk("  dibanbu  \n");
	printk(" this is key_do_work \n");
	
}

/*頂半部 名義上的處理函數*/                                                                                                                                                                                                                                                                                                                     
static irqreturn_t buttons_irq(int irq, void *dev_id)
{
	printk("  dingbanbu  press ed \n");
	//printk("irq += %d \n",irq);

	tasklet_schedule(&key_tasklet);  /*注意這裏的參數是隊列名字*/
  
	return IRQ_RETVAL(IRQ_HANDLED);
} 

static int third_drv_open(struct inode *inode, struct file *file)
{

	request_irq(IRQ_EINT0,  buttons_irq, IRQT_BOTHEDGE, "S2", 1);
	request_irq(IRQ_EINT2,  buttons_irq, IRQT_BOTHEDGE, "S3", 2);
	request_irq(IRQ_EINT11, buttons_irq, IRQT_BOTHEDGE, "S4",3);
	request_irq(IRQ_EINT19, buttons_irq, IRQT_BOTHEDGE, "S5", 4);	

	/*初始化工作隊列  把工作隊列與處理函數綁定*/
	//INIT_WORK(&key_wq,(void (*)(void *)) key_do_work);
	
	return 0;
}

ssize_t third_drv_read(struct file *file, char __user *buf, size_t size, loff_t *ppos)
{

	//num++;
	//printk("num = %d\n",num);
	
	
	return 1;
}


int third_drv_close(struct inode *inode, struct file *file)
{
	free_irq(IRQ_EINT0, 1);
	free_irq(IRQ_EINT2, 2);
	free_irq(IRQ_EINT11, 3);
	free_irq(IRQ_EINT19, 4);
	return 0;
}


static struct file_operations sencod_drv_fops = {
    .owner   =  THIS_MODULE,    /* 這是一個宏，推向編譯模塊時自動創建的__this_module變量 */
    .open    =  third_drv_open,     
	.read	 =	third_drv_read,	   
	.release =  third_drv_close,	   
};


int major;
static int third_drv_init(void)
{
	major = register_chrdev(0, "third_drv", &sencod_drv_fops);

	thirddrv_class = class_create(THIS_MODULE, "third_drv");

	thirddrv_class_dev = class_device_create(thirddrv_class, NULL, MKDEV(major, 0), NULL, "buttons"); /* /dev/buttons */

	

	return 0;
}

static void third_drv_exit(void)
{
	unregister_chrdev(major, "third_drv");
	class_device_unregister(thirddrv_class_dev);
	class_destroy(thirddrv_class);
	
	return 0;
}

module_init(third_drv_init);

module_exit(third_drv_exit);

MODULE_LICENSE("GPL");

下面的運用 工作隊列的機制的代碼

 #include <linux/module.h>
#include <linux/kernel.h>
#include <linux/fs.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/irq.h>
#include <asm/uaccess.h>
#include <asm/irq.h>
#include <asm/io.h>
#include <asm/arch/regs-gpio.h>
#include <asm/hardware.h>


static struct class *thirddrv_class;
static struct class_device	*thirddrv_class_dev;

int num = 0;

/*定義工作隊列和關聯的函數*/
struct work_struct key_wq;
void key_do_work(unsigned long);

void key_do_work(unsigned long)
{
	printk(" this is key_do_work \n");
	printk(" fuck you hhaa \n");
}

	

                                                                                                                                                                                                                                                                                                                                    
static irqreturn_t buttons_irq(int irq, void *dev_id)
{
	printk("press ed \n");
	printk("irq += %d \n",irq);

	schedule_work(&key_wq);
  
	return IRQ_RETVAL(IRQ_HANDLED);
} 

static int third_drv_open(struct inode *inode, struct file *file)
{

	request_irq(IRQ_EINT0,  buttons_irq, IRQT_BOTHEDGE, "S2", 1);
	request_irq(IRQ_EINT2,  buttons_irq, IRQT_BOTHEDGE, "S3", 2);
	request_irq(IRQ_EINT11, buttons_irq, IRQT_BOTHEDGE, "S4",3);
	request_irq(IRQ_EINT19, buttons_irq, IRQT_BOTHEDGE, "S5", 4);	

	/*初始化工作隊列  把工作隊列與處理函數綁定*/
	INIT_WORK(&key_wq,(void (*)(void *)) key_do_work, NULL);
	
	return 0;
}

ssize_t third_drv_read(struct file *file, char __user *buf, size_t size, loff_t *ppos)
{

	//num++;
	printk("num = %d\n",num);
	
	
	return 1;
}


int third_drv_close(struct inode *inode, struct file *file)
{
	free_irq(IRQ_EINT0, 1);
	free_irq(IRQ_EINT2, 2);
	free_irq(IRQ_EINT11, 3);
	free_irq(IRQ_EINT19, 4);
	return 0;
}


static struct file_operations sencod_drv_fops = {
    .owner   =  THIS_MODULE,    /* 這是一個宏，推向編譯模塊時自動創建的__this_module變量 */
    .open    =  third_drv_open,     
	.read	 =	third_drv_read,	   
	.release =  third_drv_close,	   
};


int major;
static int third_drv_init(void)
{
	major = register_chrdev(0, "third_drv", &sencod_drv_fops);

	thirddrv_class = class_create(THIS_MODULE, "third_drv");

	thirddrv_class_dev = class_device_create(thirddrv_class, NULL, MKDEV(major, 0), NULL, "buttons"); /* /dev/buttons */

	

	return 0;
}

static void third_drv_exit(void)
{
	unregister_chrdev(major, "third_drv");
	class_device_unregister(thirddrv_class_dev);
	class_destroy(thirddrv_class);
	
	return 0;
}


module_init(third_drv_init);

module_exit(third_drv_exit);

MODULE_LICENSE("GPL");