s3c2410按键驱动完整版.docx

/* 2410 中断按键驱动*基于s3c2410的16个按键驱动，采用中断的方式，实现了阻塞和非阻塞，并用定时*器进行了消抖处理消抖，也实现的异步通知，POLL机制，每个源文件我都加了比较 *详细的注释。各位刚刚学习ARM/Linux *驱动的同学可以参考。*/// button_irq_driver .c 驱动源文件 // button_irq_test.c 应用程序---按键测试（open可实现阻塞和非阻塞）// button_poll_test.c 应用程序---poll机制按键测试// button_fasync.c 应用程序---异步通知方式按键测试/* button_irq_driver .c */#includelinux/module.h#includelinux/init.h#includelinux/fs.h#includelinux/device.h#includelinux/cdev.h#includeasm/uaccess.h#includelinux/io.h#includelinux/interrupt.h#includeasm/arch/regs-gpio.h#includelinux/poll.hstatic unsigned int buttons_major = 0;//本地结构体,表示一个按键struct fsbuttons_cdev{struct cdev *buttons_cdev; //按键设备结构体struct class *buttons_class;//所属类unsigned int key_buttons; //按键管脚电?1 /0wait_queue_head_t buttons_wq;struct timer_list button_timer;};static struct fsbuttons_cdev *fs_buttons ;//构建一个结构体,用来描述中断管脚struct fspin{int irq;int pin;char *name;int num;int row_input;int row_output;int int_put;int key_val;};static struct fspin fspin_desc[4]={{IRQ_EINT0,S3C2410_GPF0,row0, 0, S3C2410_GPF0_INP,S3C2410_GPF0_OUTP,S3C2410_GPF0_EINT0},{IRQ_EINT2,S3C2410_GPF2,row1, 1, S3C2410_GPF2_INP, S3C2410_GPF2_OUTP,S3C2410_GPF2_EINT2},{IRQ_EINT11,S3C2410_GPG3,row2, 2,S3C2410_GPG3_INP, S3C2410_GPG3_OUTP,S3C2410_GPG3_EINT11},{IRQ_EINT19,S3C2410_GPG11,row3,3, S3C2410_GPG11_INP, S3C2410_GPG11_OUTP,S3C2410_GPG11_EINT19},};struct pin_col {int pin;int col_input;int col_output;};static struct pin_col col_line[4] = {{S3C2410_GPE11,S3C2410_GPE11_INP,S3C2410_GPE11_OUTP},{S3C2410_GPG6,S3C2410_GPG6_INP,S3C2410_GPG6_OUTP},{S3C2410_GPE13,S3C2410_GPE13_INP,S3C2410_GPE13_OUTP},{S3C2410_GPG2,S3C2410_GPG2_INP,S3C2410_GPG2_OUTP},};static int key_comfirm[4][4]={{10,11,12,16},{7,8,9,15},{4,5,6,14},{1,2,3,13},};/*构建异步通知注册函数用到的结构体*/struct fasync_struct *fsbuttons_fasync;struct fspin *cur_pin;static void set_col_output(void){int i;for(i = 0;i4;i++){s3c2410_gpio_cfgpin(col_line[i].pin, col_line[i].col_output);s3c2410_gpio_setpin(col_line[i].pin,0);}}static void set_col_input(void){inti;for(i = 0;i4;i