TQ2440按键中断 驱动程序及测试程序.doc

TQ2440按键中断?驱动程序及测试程序 //首先说明程序来自TQ2440手册 驱动程序： #include linux/module.h#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 #define DEVICE_NAME???? EmbedSky_buttons? //加载模式后，执行cat /proc/devices命令看到的设备名称#define BUTTON_MAJOR???? 200??? //主设备号struct button_irq_desc {??? int irq;? //中断号，中断号唯一表示一个中断??? int pin;? //中断控制的寄存器，该寄存器的值由中断引脚设置，我们希望从该寄存器读出控制信息int pin_setting; //中断的引脚，该引脚的电平由按键来控制，从而最终我们由按键控制了寄存器的值??? int number;? //编号??? char *name;?//名称};//用来指定按键所用的外部中断引脚及中断触发方式、名字static struct button_irq_desc button_irqs [] = {?{IRQ_EINT1,?S3C2410_GPF1,?S3C2410_GPF1_EINT1,?0, KEY1},?{IRQ_EINT4,?S3C2410_GPF4,?S3C2410_GPF4_EINT4,?1, KEY2},?{IRQ_EINT2,?S3C2410_GPF2,?S3C2410_GPF2_EINT2,?2, KEY3},?{IRQ_EINT0,?S3C2410_GPF0,?S3C2410_GPF0_EINT0,?3, KEY4},};//数组中是否有数据的标志，0表示无数据可读，1表示有数据可读*/static volatile int key_values [] = {0, 0, 0, 0};// 等待队列:??// 当没有按键被按下时，如果有进程调用read函数，?// 它将休眠static DECLARE_WAIT_QUEUE_HEAD(button_waitq);//定义了一个整型变量用于判定按键是否被按下，0未按下，1按下,中断事件标志，//中断服务程序将它置1，read函数将其清0// static volatile int ev_press = 0;//定义了一个返回值为irqreturn_t类型的中断服务程序*/static irqreturn_t irq_interrupt(int irq, void *dev_id){?struct button_irq_desc *button_irqs = (struct button_irq_desc *)dev_id;?int up; ?up = s3c2410_gpio_getpin(button_irqs-pin); ?if (up)??key_values[button_irqs-number]=(button_irqs-number+1)+0x80;?else???key_values[button_irqs-number] = (button_irqs-number+1);??ev_press = 1;? //表示中断发生了??wake_up_interruptible(button_waitq);//唤醒休眠的进程? ?return IRQ_RETVAL(IRQ_HANDLED);} static int tq2440_irq_open(struct inode *inode, struct file *file){?int i;? //循环变量,因为有4个按钮*/?int err = 0; //中断注册函数的返回值*/?for (i = 0; i sizeof(button_irqs)/sizeof(button_irqs[0]); i++)?{??//注册中断处理函数??s