我是使用altera nios 架設uclinux系統，且我在\driver\chart目錄底下找到有一個altera_pio_button.c 內容如下: -------------------------------------------------------------- /*  *  linux/drivers/char/altera_pio_button.c  *  A simple character driver that takes buttons on Nios Development  *  Kit as an input device (major 62)  *    *  The characters input can be  '1', '2', '4' or '8'  *    *  Copyright (C) 2004 Microtronix Datacom Ltd  *  *  This program is free software; you can redistribute it and/or  *  modify it under the terms of the GNU General Public License  *  as published by the Free Software Foundation; either version  *  2 of the License, or (at your option) any later version.  *   *  Written by Wentao Xu  */ #include #include #include #include #include #include #include #include #include #include #include #define BUTTON_MAJOR 62 #define PIO_BUTTON_BASE na_button_pio #define PIO_BUTTON_IRQ na_button_pio_irq #define PIO_BUTTON_SIZE sizeof(np_pio) #define PDEBUG printk #define BUTTON_BUF_SIZE 100 struct _button_info { int count; int head; int tail; char buf[BUTTON_BUF_SIZE]; } button_info; static int button_in_use=0; static struct file_operations button_fops; static DECLARE_MUTEX(button_mutex); static DECLARE_WAIT_QUEUE_HEAD(button_wait_queue); static void button_handle_event(void *dev_id) { static int old = 0; int status, key; np_pio* pio = (np_pio *)dev_id; outl(0, &pio->np_pioedgecapture); /* read input, check 4 buttons */ status = (~inl(&pio->np_piodata)) & 0xF; key = status - old; old = status; if (key > 0) { down(&button_mutex); /* we simply discard new inputs if buffer overflows */ if (button_info.count < BUTTON_BUF_SIZE) { button_info.buf[button_info.tail] = key '0'; button_info.tail = (button_info.tail 1) % BUTTON_BUF_SIZE; button_info.count ; } up(&button_mutex); /* wake up any waiting reader */ if (waitqueue_active(&button_wait_queue)) { wake_up_interruptible(&button_wait_queue); } } /* re-enable interrupts */ outl(-1, &pio->np_piointerruptmask); } static DECLARE_WORK(button_work, button_handle_event, (void*)PIO_BUTTON_BASE); static irqreturn_t pio_button_isr(int irq, void *dev_id, struct pt_regs *regs) { np_pio* pio = (np_pio *)dev_id; if (!pio) return IRQ_NONE; /* disable interrupt */ outl(0, &pio->np_pioedgecapture); outl(0, &pio->np_piointerruptmask); /* activate the bottom half */ schedule_work(&button_work); return IRQ_HANDLED; } static int button_start(void) { np_pio *pio=(np_pio *)(PIO_BUTTON_BASE); outl(0, &pio->np_pioedgecapture); outl(0, &pio->np_piodirection); /* register interrupt */ if (request_irq(PIO_BUTTON_IRQ, pio_button_isr, SA_INTERRUPT, "pio_button", (void*)(PIO_BUTTON_BASE))) { printk("pio_button: unable to register interrupt %d\n", PIO_BUTTON_IRQ); return -1; } outl(-1, &pio->np_piointerruptmask); return 0; } /* * Open/close . */ static int button_open(struct inode *inode, struct file *filp) { const int minor = iminor(inode); if (minor == 0) { preempt_disable(); if (button_in_use) { preempt_enable(); return -EBUSY; } /* open succeeds */ button_in_use=1; preempt_enable(); /* init buffon info */ button_info.count=0; button_info.head=0; button_info.tail=0; /* init buttons */ button_start(); return 0; } else return -ENODEV; } /* */ static int button_release(struct inode *inode, struct file *filp) { button_in_use=0; free_irq(PIO_BUTTON_IRQ, (void*)(PIO_BUTTON_BASE)); return 0; } /* */ static int button_ioctl(struct inode *inode, struct file *filp, unsigned int command, unsigned long arg) { return -EINVAL; } static ssize_t button_read(struct file *file, char *buf, size_t count, loff_t * ppos) { int i, total; if (button_info.count==0) { DEFINE_WAIT(wait); if (file->f_flags & O_NONBLOCK) return -EAGAIN; while (!signal_pending(current) && (button_info.count == 0)) { prepare_to_wait(&button_wait_queue, &wait, TASK_INTERRUPTIBLE); if (!signal_pending(current) && (button_info.count == 0)) schedule(); finish_wait(&button_wait_queue, &wait); } } if (signal_pending(current)) return -ERESTARTSYS; /* return data */ down(&button_mutex); total = (count < button_info.count) ? count : button_info.count; for (i=0; i < total; i ) { put_user(button_info.buf[button_info.head], buf i); button_info.head = (button_info.head 1) % BUTTON_BUF_SIZE; button_info.count--; } up(&button_mutex); return total; } static struct file_operations button_fops = { .read = button_read, .open = button_open, .release= button_release, .ioctl = button_ioctl, .owner = THIS_MODULE, }; static int __init button_init(void) { int i; if (!(request_mem_region((unsigned long)PIO_BUTTON_BASE, PIO_BUTTON_SIZE, "pio_button"))) return -1; if ((i=register_chrdev(BUTTON_MAJOR, "pio_button", &button_fops))<0) { printk("buttons: fail to get major %d\n", BUTTON_MAJOR); release_mem_region((unsigned long)PIO_BUTTON_BASE, PIO_BUTTON_SIZE); return i; } return 0; } static void __exit button_exit(void) { unregister_chrdev(BUTTON_MAJOR, "pio_button"); release_mem_region((unsigned long)PIO_BUTTON_BASE, PIO_BUTTON_SIZE); } module_init(button_init); module_exit(button_exit); MODULE_LICENSE("GPL"); ---------------------------------------------------------------- 請問我該如何調用這驅動程式裡面的一些function到我的程式裏面，還有就是該如何更改中斷服務程式?