/*
 *  lostirq.c
 *  Copyright (C) 2000 Media Lab. Inc.
 *
 *  Sometimes, BIOS does not set IRQ route for devices like USB.
 *  This driver can change irq for PCI devices. 
 *  Usage: insmod lostirq pcidev=bus,device,func irq=dd
 *  You can confirm this assigned irq using "lspci -v" command.
 *
 *  v0.1 Feb. 15 JST 2000 Media Lab. Inc. <info@mlb.co.jp>
 */

#define MODULE
#define __KERNEL__

#include <linux/module.h>
#include <linux/pci.h>
#include <linux/kernel.h>


static int pcidev[3] = {-1,-1,-1 };
static int irq=-1;

MODULE_PARM(pcidev, "1-" __MODULE_STRING(3) "i");
MODULE_PARM(irq, "i");

int init_module(void) {
  int pci_index = 0;
/*
  struct pci_dev *dev = pci_devices;
*/
  struct pci_dev *dev;
  unsigned char pci_bus, pci_device_fn;
  int devfn = (pcidev[1] << 3) + pcidev[2];
  int bus = pcidev[0];

  if (pcidev[0] == -1 || pcidev[1] == -1 || pcidev[2] == -1 
	|| irq == -1) {
    printk(KERN_ERR "lostirq: need args   pcidev=bus,dev,func irq=dd\n");
    return 1;
  }

  /*
  printk("lostirq: start bus=%x devfn=%x irq=%d\n",bus,devfn,irq);
  */

  for(dev = pci_dev_g(pci_devices.next); dev != pci_dev_g(&pci_devices); dev = pci_dev_g(dev->global_list.next)) {
    /*
    printk("index:%d vendor:%x device:%x devfn:%x irq:%d\n", 
	   pci_index,dev->vendor,dev->device,dev->devfn,dev->irq);
    */
    if (bus == dev->bus->number && devfn == dev->devfn) {
      printk("lostirq: found device bus=%x device=%x func=%x set irq=%d\n",
	bus,devfn>>3,devfn&0x7,irq);
      dev->irq = irq;
      pci_write_config_byte( dev , PCI_INTERRUPT_LINE , irq );
    }
  }
  return(0);
}

void cleanup_module(void) {
  printk("lostirq: end\n");
}