应用程序
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/* fifthdrvtest
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*/
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int fd;
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//信号处理函数
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void my_signal_fun(int signum)
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{
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unsigned char key_val;
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read(fd, &key_val, 1);
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printf( "key_val: 0x%x\n", key_val);
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}
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int main(int argc, char **argv)
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{
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unsigned char key_val;
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int ret;
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int Oflags;
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//在应用程序中捕捉SIGIO信号(由驱动程序发送)
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signal(SIGIO, my_signal_fun);
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fd = open( "/dev/buttons", O_RDWR);
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if (fd < 0)
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{
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printf( "can't open!\n");
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}
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//将当前进程PID设置为fd文件所对应驱动程序将要发送SIGIO,SIGUSR信号进程PID
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fcntl(fd, F_SETOWN, getpid());
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//获取fd的打开方式
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Oflags = fcntl(fd, F_GETFL);
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//将fd的打开方式设置为FASYNC --- 即 支持异步通知
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//该行代码执行会触发 驱动程序中 file_operations->fasync 函数 ------fasync函数调用fasync_helper初始化一个fasync_struct结构体,该结构体描述了将要发送信号的进程PID (fasync_struct->fa_file->f_owner->pid)
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fcntl(fd, F_SETFL, Oflags | FASYNC);
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while ( 1)
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{
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sleep( 1000);
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}
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return 0;
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}
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static struct class *fifthdrv_class;
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static struct class_device *fifthdrv_class_dev;
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//volatile unsigned long *gpfcon;
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//volatile unsigned long *gpfdat;
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static DECLARE_WAIT_QUEUE_HEAD(button_waitq);
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/* 中断事件标志, 中断服务程序将它置1,fifth_drv_read将它清0 */
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static volatile int ev_press = 0;
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static struct fasync_struct *button_async;
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struct pin_desc{
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unsigned int pin;
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unsigned int key_val;
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};
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/* 键值: 按下时, 0x01, 0x02, 0x03, 0x04 */
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/* 键值: 松开时, 0x81, 0x82, 0x83, 0x84 */
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static unsigned char key_val;
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/*
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* K1,K2,K3,K4对应GPG0,GPG3,GPG5,GPG6
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*/
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struct pin_desc pins_desc[4] = {
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{S3C2410_GPG0, 0x01},
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{S3C2410_GPG3, 0x02},
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{S3C2410_GPG5, 0x03},
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{S3C2410_GPG6, 0x04},
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};
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/*
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* 确定按键值
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*/
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static irqreturn_t buttons_irq(int irq, void *dev_id)
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{
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struct pin_desc * pindesc = (struct pin_desc *)dev_id;
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unsigned int pinval;
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pinval = s3c2410_gpio_getpin(pindesc->pin);
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if (pinval)
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{
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/* 松开 */
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key_val = 0x80 | pindesc->key_val;
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}
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else
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{
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/* 按下 */
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key_val = pindesc->key_val;
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}
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ev_press = 1; /* 表示中断发生了 */
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wake_up_interruptible(&button_waitq); /* 唤醒休眠的进程 */
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//发送信号SIGIO信号给fasync_struct 结构体所描述的PID,触发应用程序的SIGIO信号处理函数
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kill_fasync (&button_async, SIGIO, POLL_IN);
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return IRQ_RETVAL(IRQ_HANDLED);
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}
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static int fifth_drv_open(struct inode *inode, struct file *file)
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{
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/* GPG0,GPG3,GPG5,GPG6为中断引脚: EINT8,EINT11,EINT13,EINT14 */
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request_irq(IRQ_EINT8, buttons_irq, IRQT_BOTHEDGE, "K1", &pins_desc[ 0]);
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request_irq(IRQ_EINT11, buttons_irq, IRQT_BOTHEDGE, "K2", &pins_desc[ 1]);
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request_irq(IRQ_EINT13, buttons_irq, IRQT_BOTHEDGE, "K3", &pins_desc[ 2]);
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request_irq(IRQ_EINT14, buttons_irq, IRQT_BOTHEDGE, "K4", &pins_desc[ 3]);
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return 0;
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}
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ssize_t fifth_drv_read(struct file *file, char __user *buf, size_t size, loff_t *ppos)
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{
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if (size != 1)
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return -EINVAL;
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/* 如果没有按键动作, 休眠 */
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wait_event_interruptible(button_waitq, ev_press);
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/* 如果有按键动作, 返回键值 */
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copy_to_user(buf, &key_val, 1);
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ev_press = 0;
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return 1;
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}
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int fifth_drv_close(struct inode *inode, struct file *file)
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{
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free_irq(IRQ_EINT8, &pins_desc[ 0]);
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free_irq(IRQ_EINT11, &pins_desc[ 1]);
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free_irq(IRQ_EINT13, &pins_desc[ 2]);
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free_irq(IRQ_EINT14, &pins_desc[ 3]);
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return 0;
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}
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static unsigned fifth_drv_poll(struct file *file, poll_table *wait)
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{
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unsigned int mask = 0;
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poll_wait(file, &button_waitq, wait); // 不会立即休眠
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if (ev_press)
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mask |= POLLIN | POLLRDNORM;
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return mask;
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}
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static int fifth_drv_fasync (int fd, struct file *filp, int on)
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{
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printk( "driver: fifth_drv_fasync\n");
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//初始化/释放 fasync_struct 结构体 (fasync_struct->fa_file->f_owner->pid)
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return fasync_helper (fd, filp, on, &button_async);
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}
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static struct file_operations sencod_drv_fops = {
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.owner = THIS_MODULE, /* 这是一个宏,推向编译模块时自动创建的__this_module变量 */
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.open = fifth_drv_open,
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.read = fifth_drv_read,
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.release = fifth_drv_close,
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.poll = fifth_drv_poll,
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.fasync = fifth_drv_fasync,
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};
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int major;
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static int fifth_drv_init(void)
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{
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major = register_chrdev( 0, "fifth_drv", &sencod_drv_fops);
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fifthdrv_class = class_create(THIS_MODULE, "fifth_drv");
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fifthdrv_class_dev = class_device_create(fifthdrv_class, NULL, MKDEV(major, 0), NULL, "buttons"); /* /dev/buttons */
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// gpfcon = (volatile unsigned long *)ioremap(0x56000050, 16);
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// gpfdat = gpfcon + 1;
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return 0;
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}
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static void fifth_drv_exit(void)
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{
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unregister_chrdev(major, "fifth_drv");
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class_device_unregister(fifthdrv_class_dev);
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class_destroy(fifthdrv_class);
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// iounmap(gpfcon);
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return 0;
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}
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module_init(fifth_drv_init);
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module_exit(fifth_drv_exit);
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MODULE_LICENSE( "GPL");
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/* fifthdrvtest
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*/
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int fd;
-
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//信号处理函数
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void my_signal_fun(int signum)
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{
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unsigned char key_val;
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read(fd, &key_val, 1);
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printf( "key_val: 0x%x\n", key_val);
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}
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int main(int argc, char **argv)
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{
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unsigned char key_val;
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int ret;
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int Oflags;
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//在应用程序中捕捉SIGIO信号(由驱动程序发送)
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signal(SIGIO, my_signal_fun);
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fd = open( "/dev/buttons", O_RDWR);
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if (fd < 0)
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{
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printf( "can't open!\n");
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}
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//将当前进程PID设置为fd文件所对应驱动程序将要发送SIGIO,SIGUSR信号进程PID
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fcntl(fd, F_SETOWN, getpid());
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//获取fd的打开方式
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Oflags = fcntl(fd, F_GETFL);
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//将fd的打开方式设置为FASYNC --- 即 支持异步通知
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//该行代码执行会触发 驱动程序中 file_operations->fasync 函数 ------fasync函数调用fasync_helper初始化一个fasync_struct结构体,该结构体描述了将要发送信号的进程PID (fasync_struct->fa_file->f_owner->pid)
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fcntl(fd, F_SETFL, Oflags | FASYNC);
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while ( 1)
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{
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sleep( 1000);
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}
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return 0;
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}
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static struct class *fifthdrv_class;
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static struct class_device *fifthdrv_class_dev;
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//volatile unsigned long *gpfcon;
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//volatile unsigned long *gpfdat;
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static DECLARE_WAIT_QUEUE_HEAD(button_waitq);
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/* 中断事件标志, 中断服务程序将它置1,fifth_drv_read将它清0 */
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static volatile int ev_press = 0;
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static struct fasync_struct *button_async;
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struct pin_desc{
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unsigned int pin;
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unsigned int key_val;
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};
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/* 键值: 按下时, 0x01, 0x02, 0x03, 0x04 */
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/* 键值: 松开时, 0x81, 0x82, 0x83, 0x84 */
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static unsigned char key_val;
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/*
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* K1,K2,K3,K4对应GPG0,GPG3,GPG5,GPG6
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*/
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struct pin_desc pins_desc[4] = {
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{S3C2410_GPG0, 0x01},
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{S3C2410_GPG3, 0x02},
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{S3C2410_GPG5, 0x03},
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{S3C2410_GPG6, 0x04},
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};
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/*
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* 确定按键值
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*/
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static irqreturn_t buttons_irq(int irq, void *dev_id)
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{
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struct pin_desc * pindesc = (struct pin_desc *)dev_id;
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unsigned int pinval;
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pinval = s3c2410_gpio_getpin(pindesc->pin);
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if (pinval)
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{
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/* 松开 */
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key_val = 0x80 | pindesc->key_val;
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}
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else
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{
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/* 按下 */
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key_val = pindesc->key_val;
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}
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ev_press = 1; /* 表示中断发生了 */
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wake_up_interruptible(&button_waitq); /* 唤醒休眠的进程 */
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//发送信号SIGIO信号给fasync_struct 结构体所描述的PID,触发应用程序的SIGIO信号处理函数
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kill_fasync (&button_async, SIGIO, POLL_IN);
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return IRQ_RETVAL(IRQ_HANDLED);
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}
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static int fifth_drv_open(struct inode *inode, struct file *file)
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{
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/* GPG0,GPG3,GPG5,GPG6为中断引脚: EINT8,EINT11,EINT13,EINT14 */
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request_irq(IRQ_EINT8, buttons_irq, IRQT_BOTHEDGE, "K1", &pins_desc[ 0]);
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request_irq(IRQ_EINT11, buttons_irq, IRQT_BOTHEDGE, "K2", &pins_desc[ 1]);
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request_irq(IRQ_EINT13, buttons_irq, IRQT_BOTHEDGE, "K3", &pins_desc[ 2]);
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request_irq(IRQ_EINT14, buttons_irq, IRQT_BOTHEDGE, "K4", &pins_desc[ 3]);
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return 0;
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}
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ssize_t fifth_drv_read(struct file *file, char __user *buf, size_t size, loff_t *ppos)
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{
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if (size != 1)
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return -EINVAL;
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/* 如果没有按键动作, 休眠 */
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wait_event_interruptible(button_waitq, ev_press);
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/* 如果有按键动作, 返回键值 */
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copy_to_user(buf, &key_val, 1);
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ev_press = 0;
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return 1;
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}
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int fifth_drv_close(struct inode *inode, struct file *file)
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{
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free_irq(IRQ_EINT8, &pins_desc[ 0]);
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free_irq(IRQ_EINT11, &pins_desc[ 1]);
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free_irq(IRQ_EINT13, &pins_desc[ 2]);
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free_irq(IRQ_EINT14, &pins_desc[ 3]);
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return 0;
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}
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static unsigned fifth_drv_poll(struct file *file, poll_table *wait)
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{
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unsigned int mask = 0;
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poll_wait(file, &button_waitq, wait); // 不会立即休眠
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if (ev_press)
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mask |= POLLIN | POLLRDNORM;
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return mask;
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}
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static int fifth_drv_fasync (int fd, struct file *filp, int on)
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{
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printk( "driver: fifth_drv_fasync\n");
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//初始化/释放 fasync_struct 结构体 (fasync_struct->fa_file->f_owner->pid)
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return fasync_helper (fd, filp, on, &button_async);
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}
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static struct file_operations sencod_drv_fops = {
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.owner = THIS_MODULE, /* 这是一个宏,推向编译模块时自动创建的__this_module变量 */
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.open = fifth_drv_open,
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.read = fifth_drv_read,
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.release = fifth_drv_close,
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.poll = fifth_drv_poll,
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.fasync = fifth_drv_fasync,
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};
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int major;
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static int fifth_drv_init(void)
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{
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major = register_chrdev( 0, "fifth_drv", &sencod_drv_fops);
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fifthdrv_class = class_create(THIS_MODULE, "fifth_drv");
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fifthdrv_class_dev = class_device_create(fifthdrv_class, NULL, MKDEV(major, 0), NULL, "buttons"); /* /dev/buttons */
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// gpfcon = (volatile unsigned long *)ioremap(0x56000050, 16);
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// gpfdat = gpfcon + 1;
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return 0;
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}
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static void fifth_drv_exit(void)
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{
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unregister_chrdev(major, "fifth_drv");
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class_device_unregister(fifthdrv_class_dev);
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class_destroy(fifthdrv_class);
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// iounmap(gpfcon);
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return 0;
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}
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module_init(fifth_drv_init);
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module_exit(fifth_drv_exit);
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MODULE_LICENSE( "GPL");