In actual scenarios the interrupt request (request_irq()) should be done in module_init() function. You did it in your open function, that will not lead to any problem but in this case your module's interrupt handler will not receive any interrupt requests, when your device file is closed, so you are missing a lot of interrupts. It's better you request interrupt in module_init() fuinction and free it in cleanup_module() function. Also try to printk in interrupt handler. One important thing, are you sure your mouse is using interrupt line 3 itself, because on my machine mouse is using interrupt line 12. Just confirm this, it might be the reason for problem. If your hardware is using some different interrupt and you requested some different one in your driver, Linux Kernel will not be able to direct the interrupt request to your interrupt handler. Just check it. Cheers !! Gaurav. -----Original Message----- From: kernelnewbies-bounce@xxxxxxxxxxxx [mailto:kernelnewbies-bounce@xxxxxxxxxxxx] On Behalf Of Maikon Bueno Sent: Friday, July 23, 2004 7:40 AM To: kernelnewbies@xxxxxxxxxxxx Subject: interrupt function Hi All... I`m trying to enable the serial interrupt, but whenever it happens some event, the interrupt function isn't called. The follow code will be a serial mouse driver. When some event occurs, the "interrupt_count" is incremented and its result is shown when the module is released. I would like to know how to enable the interrupt function... I don't know what is happening. Thanks!!! Maikon. -------------------------------------------------- #define MODULE #define __KERNEL__ #include<linux/ioport.h> #include <linux/config.h> #include <linux/module.h> #include<linux/sched.h> #include<linux/poll.h> #include<linux/interrupt.h> #include<linux/miscdevice.h> #include<linux/init.h> #include <linux/kernel.h> #include<linux/slab.h> #include <linux/fs.h> #include <linux/errno.h> #include <linux/types.h> #include <linux/proc_fs.h> #include <linux/fcntl.h> #include <linux/devfs_fs_kernel.h> #define OURMOUSE_BASE 0x300 #define OURMOUSE_MINOR 1 #define OURMOUSE_MAJOR 56 #define MOUSE_IRQ 3 static int mouse_users = 0; static int mouse_dx = 0; static int mouse_dy = 0; static int mouse_event = 0; static int mouse_buttons = 0; static int mouse_intr = MOUSE_IRQ; static int interrupt_count=0; static struct wait_queue *mouse_wait; static spinlock_t mouse_lock = SPIN_LOCK_UNLOCKED; static devfs_handle_t ourmouse_dir; static devfs_handle_t ourmouse_dev; static int ourmouse_open(struct inode *inode, struct file *file); static int ourmouse_close(struct inode *inode,struct file *file); static void ourmouse_interrupt(int irq, void *dev_id, struct pt_regs *regs); static unsigned int mouse_poll(struct file *file, poll_table *wait); MODULE_LICENSE("GPL"); MODULE_AUTHOR("Maikon Bueno"); char ourmouse_str[] = "Hi Baby!\n "; ssize_t ourmouse_read(struct file *filp , char *buf, size_t count, loff_t *offp) { struct inode *inode = filp->f_dentry->d_inode; int minor = MINOR(inode->i_rdev); char *txt; if (filp->private_data) { txt = filp->private_data; } else { txt = ourmouse_str; } if (count > strlen(txt)) count = strlen(txt); copy_to_user(buf, txt, count); *offp += count; return count; } struct file_operations ourmouse_fops = { read: ourmouse_read, open: ourmouse_open, release: ourmouse_close, }; int init_module(void){ printk("<1> initing\n"); if(check_region(OURMOUSE_BASE, 3)) return -ENODEV; request_region(OURMOUSE_BASE, 3,"Ourmouse"); devfs_register_chrdev(OURMOUSE_MAJOR,"Ourmouse",&ourmouse_fops); ourmouse_dir = devfs_mk_dir(NULL,"Ourmouse", NULL); if(ourmouse_dir == NULL){ printk("<1> Couldn't make the Ourmouse's dir\n"); } ourmouse_dev = devfs_register(ourmouse_dir, "Ourmouse",DEVFS_FL_NONE,OURMOUSE_MAJOR,OURMOUSE_MINOR, S_IFCHR | S_IRUGO,&ourmouse_fops, NULL); if (ourmouse_dev == NULL){ printk("<1> Couldn't register Ourmouse\n"); } return 0; } void cleanup_module(void){ release_region(OURMOUSE_BASE, 3); devfs_unregister(ourmouse_dev); printk("<1> Bye %i\n",interrupt_count); } static int ourmouse_open(struct inode *inode, struct file *file) { if(mouse_users++) return 0; if(request_irq(mouse_intr, ourmouse_interrupt, 0,"Ourmouse", NULL)) { mouse_users--; return -EBUSY; } mouse_dx = 0; mouse_dy = 0; mouse_buttons = 0; mouse_event = 0; MOD_INC_USE_COUNT; return 0; } static int ourmouse_close(struct inode *inode,struct file *file) { if(--mouse_users) return 0; free_irq(mouse_intr, NULL); MOD_DEC_USE_COUNT; return 0; } static void ourmouse_interrupt(int irq, void *dev_id, struct pt_regs *regs) { interrupt_count++; } static unsigned int mouse_poll(struct file *file, poll_table *wait) { return 0; } -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/ -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
