keyboard driver question

Racz Zoli racz.zoli at
Thu Jan 3 13:17:58 EST 2013


I`m sorry if this isn`t the right place to post my question, but first I
tried posting it on and nobody answered. Here`s my

I have a Gembird kb-9140l keyboard with some multimedia keys which are not
working on linux. I thought about writing my own driver for it, so as a
start, I wrote a small module, which registers an interrupt handler on irq
1 with the IRQF_SHARED flag. In the handler function I put a simple printk
with the scancode read from the keyboard. The problem is, that the handler
never gets executed. I searched on google, and found that because the
native driver doesn`t share its interrupt with another modules, before I
call request_irq I have to free the original interrupt handler from the
native driver. This would make my computer practically unusable until I
reboot, but at least I would see, it works, but it doesn`t. The original
driver works fine after I insert my module, and the interrupt handler still
doesn`t get called. The weird thing is, when I remove my module, my handler
executes ones, and the scancode is 0xFE.

The code is the following:

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <asm/io.h>


static int gembirdkb_init(void);
static void gembirdkb_exit(void);

irq_handler_t irq_handler (int irq, void *dev_id, struct pt_regs *regs)
static unsigned char scancode;

scancode = inb (0x60);

printk("gembirdkb: irq handled... scancode: %d\n",scancode);

return (irq_handler_t) IRQ_HANDLED;

static int gembirdkb_init(void)
int ret;

/* free original interrupt handler */
// free_irq(1, NULL);

ret = request_irq (1, (irq_handler_t) irq_handler, IRQF_SHARED,
"gembirdkb", (void *)&irq_handler);

printk("gembirdkb: request_irq result: %d\n", ret);

return ret;

static void gembirdkb_exit(void)
free_irq(1, (void *)&irq_handler);


Is there any way I can remove the native driver, or I need to recompile the
kernel without it, and insert mine?

P.s.: Why every topic on the forum is full with questions about mac,
iphone, samsung galaxy etc.?
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