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_data *port_data;
  30         struct pcie_port_service_driver *driver;
  31
  32         if (drv->bus != &pcie_port_bus_type || dev->bus != &pcie_port_bus_type)
  33                 return 0;
  34
  35         pciedev = to_pcie_device(dev);
  36         driver = to_service_driver(drv);
  37
  38         if (driver->service != pciedev->service)
  39                 return 0;
  40
  41         port_data = pci_get_drvdata(pciedev->port);
  42
  43         if (driver->port_type != PCIE_ANY_PORT
  44              && driver->port_type != port_data->port_type)
  45                 return 0;
  46
  47         return 1;
  48 }
  49
  50 int pcie_port_bus_register(void)
  51 {
  52         return bus_register(&pcie_port_bus_type);
  53 }
  54
  55 void pcie_port_bus_unregister(void)
  56 {
  57         bus_unregister(&pcie_port_bus_type);
  58 }