drivers/pci/pcie/portdrv_bus.c

   1 /*
   2  * File:        portdrv_bus.c
   3  * Purpose:     PCI Express Port Bus Driver's Bus Overloading Functions
   4  *
   5  * Copyright (C) 2004 Intel
   6  * Copyright (C) Tom Long Nguyen (tom.l.nguyen@intel.com)
   7  */
   8
   9 #include <linux/module.h>
  10 #include <linux/pci.h>
  11 #include <linux/kernel.h>
  12 #include <linux/errno.h>
  13 #include <linux/pm.h>
  14
  15 #include <linux/pcieport_if.h>
  16 #include "portdrv.h"
  17
  18 static int pcie_port_bus_match(struct device *dev, struct device_driver *drv);
  19
  20 struct bus_type pcie_port_bus_type = {
  21         .name           = "pci_express",
  22         .match          = pcie_port_bus_match,
  23 };
  24 EXPORT_SYMBOL_GPL(pcie_port_bus_type);
  25
  26 static int pcie_port_bus_match(struct device *dev, struct device_driver *drv)
  27 {
  28         struct pcie_device *pciedev;
  29         struct pcie_port_service_driver *driver;
  30
  31         if (drv->bus != &pcie_port_bus_type || dev->bus != &pcie_port_bus_type)
  32                 return 0;
  33
  34         pciedev = to_pcie_device(dev);
  35         driver = to_service_driver(drv);
  36
  37         if (driver->service != pciedev->service)
  38                 return 0;
  39
  40         if ((driver->port_type != PCIE_ANY_PORT) &&
  41             (driver->port_type != pciedev->port->pcie_type))
  42                 return 0;
  43
  44         return 1;
  45 }
  46
  47 int pcie_port_bus_register(void)
  48 {
  49         return bus_register(&pcie_port_bus_type);
  50 }
  51
  52 void pcie_port_bus_unregister(void)
  53 {
  54         bus_unregister(&pcie_port_bus_type);
  55 }