/* Bottom Half */
static void got_char(void *scancode)
{
printk("Scan Code %x %s.\n",
(int) *((char *) scancode) & 0x7F,
*((char *) scancode) & 0x80 ? "Released" : "Pressed");
}
try printk("<1> Scan Code ......");/* The keyboard interrupt handler function */ void irq_handler(int irq, void *dev_id, struct pt_regs *regs) { /* This variables are static because they need to be * * accessible (through pointers) to the bottom half routine. * */ static unsigned char scancode; static struct tq_struct task = { routine:got_char, data:&scancode };
unsigned char status; /* Read keyboard status */ status = inb(0x64); scancode = inb(0x60); printk( "<1> in the irq_handler function\n");
/* Scheduale bottom half to run */ #if LINUX_VERSION_CODE > KERNEL_VERSION(2,2,0) queue_task(&task, &tq_immediate); #else queue_task_irq(&task, &tq_immediate); #endif mark_bh(IMMEDIATE_BH); } /* Initialize the module . register the IRQ handler */ int init_module() { int result = 0;
/* Since the keyboard handler won't co.exist with another handler, * * such as us, we have to disable it (free its IRQ) before we do * * anything. Since we don't know where it is, there's no way to * * reinstate it later . so the computer will have to be rebooted * * when we're done. * */ free_irq(1, NULL);
/* Request IRQ 1, the keyboard IRQ, to go to our irq_handler. */ /* return value 0 => success */ result = request_irq(1,irq_handler,0,"test_keyboard_irq_handler",NULL); if ( result != 0 ) { printk ( "<1>request_irq failed, with result=%d\n",result ); return -1; } else { printk ( "<1>request_irq successful!\n" ); return 0; }
} /* Cleanup */ void cleanup_module() { free_irq(1, NULL); } ===============================================================
-- 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/
