From mboxrd@z Thu Jan  1 00:00:00 1970
From: sumalatha <suma.aluru@gmail.com>
Date: Tue, 26 Sep 2006 08:52:14 +0000
Subject: Re: PCI hotplug question: drivers
Message-Id: <loom.20060926T104211-71@post.gmane.org>
List-Id: <linux-hotplug.vger.kernel.org>
References: <loom.20060915T082244-470@post.gmane.org>
In-Reply-To: <loom.20060915T082244-470@post.gmane.org>
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To: linux-hotplug@vger.kernel.org

Greg KH <greg <at> kroah.com> writes:

>=20

> If you have rtlinux issues, I suggest you ask on a rtlinux specific
> mailing list, as I do not know anything about it.
>=20

 Hello Greg,
         I am facing the same problem with linux driver too.Forget about
RTLinux.Regarding linux where may be the mistake in my code below. why loca=
l bus
offsets are giving 0xffff always after hot swap?


static struct pci_device_id my_id_table[] __devinitdata =3D {
  {0xAAAA,0xBBBB,0xCCCC,0xDDDD, 0, 0, 0 },
  {0xAAAA,0xBBBB,0xCCCC,0xDDDD, 0, 0, 0 },
  {0,},
 };

 MODULE_DEVICE_TABLE(pci, my_id_table);

 static int __devinit 	my_init_one (struct pci_dev *, const struct pci_devi=
ce_id *);
 static int __devexit 	my_remove_one (struct pci_dev *);

 static struct pci_driver my_pci_driver =3D {
	name:		DRV_NAME,
	id_table:	my_id_table,
	probe:		my_init_one,
	remove:		__devexit_p(my_remove_one)=20
 };



 static int __devinit my_init_one(struct pci_dev *pdev,const struct
pci_device_id *my_id_table)
 {
    unsigned char pci_bus, pci_device_fn;
    int flag =3D -1,result =3D 0,ret =3D 0;

    printf("my_init_one invoked!\n");
   =20
    /* initialize device structures */
    for(pciCnt =3D 0; pciCnt < MAX_DEV; pciCnt++)
           devCtrl[pciCnt]=3D0;

    /* Initialize PCI controller*/=20
     devCtrl[i] =3D pdev;
     if(pci_enable_device(devCtrl[i]) < 0) {
            printf("\nnot enabled");
            ret =3D -EBUSY;
      }
     pci_bus =3D devCtrl[i]->bus->number;
     pci_device_fn =3D devCtrl[i]->devfn;
     pio_start[i] =3D pci_resource_start(devCtrl[i], 2);
     len[i] =3D pci_resource_len(devCtrl[i], 2);
     printf("\nBusnumber =3D %x",pci_bus);
     printf("\nDevfn =3D %x",pci_device_fn);
     printf("\nBAR2 ADDR =3D %x",pio_start[i]);
    =20
     if((pci_request_regions(pdev,DRV_NAME))) {
               ret =3D -ENOMEM;
       //        goto mem_err_out;
     }
     if(i =3D 0) {

         if(register_chrdev(---, "mydev_0", &my_fops)) {
                ret =3D -EIO;
     //           goto register_err_out;
      =20
         }
                   =20
      }
     if(i =3D 1 ) {
         if ( register_chrdev(----, "mydev_1", &my_fops)) {
                 ret =3D -EIO;
    //             goto register_err_out;
         }
     }

     i++;
  return ret;
  }

 static int __devexit my_remove_one(struct pci_dev *pdev)
 {
    int j=3D0,k;
    printf ("my_remove_one invoked!\n");

    pci_release_regions(pdev);
    pci_disable_device(pdev);

    return 0;
 }



init_module()
 {
      int ret;

      printk("\nmy_init\n");

      ret =3D pci_module_init(&my_pci_driver);
      printk("\nmain ret =3D %d ",ret);
      if (ret !=3D 0)
            return -EFAULT;

cleanup_module()
{
      pci_unregister_driver(&my_pci_driver);
      unregister_chrdev("mydev_0");
      unregister_chrdev("mydev_1");
}


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