jz2440 的中断中的底半部机制

改的别人的代码，稍微拓展了一下。主要是运用tasklet和工作队列两种方法。

tasklet的代码

#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> /*这个头文件是必须加的 和这个函数 DECLARE_TASKLET有关*/

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

/*一般就这么写*/
void key_do_tasklet(unsigned long );
DECLARE_TASKLET(key_tasklet,key_do_tasklet,0);

/*底半部真正的处理函数*/
void key_do_tasklet(unsigned long date) /*这里需要一个参数*/
{
printk(" dibanbu \n");
printk(" this is key_do_work \n");

}

/*顶半部 名义上的处理函数*/
static irqreturn_t buttons_irq(int irq, void *dev_id)
{
printk(" dingbanbu press ed \n");
//printk("irq += %d \n",irq);

tasklet_schedule(&key_tasklet); /*注意这里的参数是队列名字*/

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);

/*初始化工作队列 把工作队列与处理函数绑定*/
//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, /* 这是一个宏，推向编译模块时自动创建的__this_module变量 */
.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");


下面的运用 工作队列的机制的代码

#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;

/*定义工作队列和关联的函数*/
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);

/*初始化工作队列 把工作队列与处理函数绑定*/
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, /* 这是一个宏，推向编译模块时自动创建的__this_module变量 */
.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");