Re: PCI hotplug question: drivers

[sumalatha <suma.aluru@gmail.com>]

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

> 

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

 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 local bus
offsets are giving 0xffff always after hot swap?


static struct pci_device_id my_id_table[] __devinitdata = {
  {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_device_id *);
 static int __devexit 	my_remove_one (struct pci_dev *);

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



 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 = -1,result = 0,ret = 0;

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

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

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

     i++;
  return ret;
  }

 static int __devexit my_remove_one(struct pci_dev *pdev)
 {
    int j=0,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 = pci_module_init(&my_pci_driver);
      printk("\nmain ret = %d ",ret);
      if (ret != 0)
            return -EFAULT;

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


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