s3c2440开发板按键中断驱动.doc

/*NAME:button.c*/#include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define DEVICE_NAME IRQ-Teststruct button_irq_desc int irq; int pin; int pin_setting; int number; char *name;#if !defined (CONFIG_SKY2440_IRQ_TEST)static struct button_irq_desc button_irqs = IRQ_EINT1,S3C2410_GPF1,S3C2410_GPF1_EINT1,0, KEY1, /* K1 */IRQ_EINT4,S3C2410_GPF4,S3C2410_GPF4_EINT4,1, KEY2, /* K2 */IRQ_EINT2,S3C2410_GPF2,S3C2410_GPF2_EINT2,2, KEY3, /* K3 */IRQ_EINT0,S3C2410_GPF0,S3C2410_GPF0_EINT0,3, KEY4, /* K4 */;#elsestatic struct button_irq_desc button_irqs = IRQ_EINT9,S3C2410_GPG1,S3C2410_GPG1_EINT9,0, KEY1, /* K1 */IRQ_EINT11,S3C2410_GPG3,S3C2410_GPG3_EINT11,1, KEY2, /* K2 */IRQ_EINT2,S3C2410_GPF2,S3C2410_GPF2_EINT2,2, KEY3, /* K3 */IRQ_EINT0,S3C2410_GPF0,S3C2410_GPF0_EINT0,3, KEY4, /* K4 */;#endifstatic volatile char key_values = 0, 0, 0, 0;static DECLARE_WAIT_QUEUE_HEAD(button_waitq);static volatile int ev_press = 0;/1 0static irqreturn_t irq_interrupt(int irq, void *dev_id)struct button_irq_desc *button_irqs = (struct button_irq_desc *)dev_id;int down;down = !s3c2410_gpio_getpin(button_irqs-pin);if (down != (key_valuesbutton_irqs-number & 1)key_valuesbutton_irqs-number = 0 + down;ev_press = 1;wake_up_interruptible(&button_waitq);return IRQ_RETVAL(IRQ_HANDLED);static int tq2440_irq_open(struct inode *inode, struct file *file)int i;int err = 0;for (i = 0; i sizeof(button_irqs)/sizeof(button_irqs0); i+)if (button_irqsi.irq = 0; i-)if (button_irqsi.irq 0)continue;disable_irq(button_irqsi.irq);free_irq(button_irqsi.irq, (void *)&button_irqsi);return -EBUSY;ev_press = 1;return 0;static int tq2440_irq_close(struct inode *inode, struct file *file)int i;for (i = 0; i sizeof(button_irqs)/sizeof(button_irqs0); i+)if (button_irqsi.irq f_flags & O_NONBLOCK)return -EAGAIN;elsewait_event_interruptible(button_waitq, ev_press);ev_press = 0;err = copy_to_user(buff, (const void *)key_values, min(sizeof(key_values), count);return err ? -EFAULT : min(sizeof(key_values), count);static unsigned int tq2440_irq_poll( struct file *file, struct poll_table_struct *wait)unsigned int mask = 0;poll_wait(file, &button_waitq, wait);if (ev_press)mask |= POLLIN | POLLRDNORM;return mask;static struct file_operations dev_fops = .owner= THIS_MODULE,.open= tq2440_irq_open,.release= tq2440_irq_close, .read= tq2440_irq_read,.poll= tq2440_irq_poll,;static struct miscdevice misc = .minor = MISC_DYNAMIC_MINOR,.name = DEVICE_NAME,.fops = &dev_fops,;static int _init dev_init(void)int ret;ret = misc_register(&misc);printk (DEVICE_NAME initializedn);return ret;static void _exit dev_exit(void)misc_deregister(&misc);module_init(dev_i