Hello,
you program does not use Xenomai services and is therefore off-topic
here, nevertheless...
mani bhatti wrote:
Hi
I have attached a kernel module parint.c.When i insert parint.ko into
kernel i get the following message from kernel .
Request_irq returns 0
Interrupt generated. You should see the handler-message
Badness in enable_irq at kernel/irq/manage.c:126
[<c012da81>] enable_irq+0x68/0xdf
[<c80be033>] init_module+0x22/0x52 [parint]
[<c80be000>] handler+0x0/0x11 [parint]
[<c012c78a>] sys_init_module+0xb5/0x221
[<c0102898>] syscall_call+0x7/0xb
Please if some one can point out the mistake i would be very helpful.
Thanks.
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#include <linux/module.h>
#include <linux/interrupt.h>
#include <asm/io.h>
#define BASEPORT 0x378
static int handler(void)
{
// do stuff
printk(">>> PARALLEL PORT INT HANDLED\n");
return IRQ_HANDLED;
}
int xinit_module(void)
{
int ret;
ret = request_irq(7, handler, SA_INTERRUPT, "parallelport", NULL);
enable_irq(7);
I think that's the reason for the oops. Remove the unbalanced
enable_irq() and disable_irq() from you code example. request_irq() and
disable_irq() already enabled/disable the interrupts.
printk("\nRequest_irq returns %d \n",ret);
//set port to interrupt mode; pins are output
outb_p(0x10, BASEPORT + 2);
// printk("Generating interrupt now on all output pins (intr/ACK = pin
10)\n");
//generate interrupt
outb_p(0, BASEPORT);
outb_p(255, BASEPORT);
outb_p(0, BASEPORT);
// printk("Interrupt generated. You should see the handler-message\n");
return 0;
}
void xcleanup_module(void)
{
disable_irq(7);
free_irq(7, NULL);
}
module_init(xinit_module);
module_exit(xcleanup_module);
MODULE_LICENSE("GPL");
In gerneral, you should use RTDM services in a Xenomai driver module.
Wolfgang.
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