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 static int pcie_port_bus_suspend(struct device *dev, pm_message_t state);
  20 static int pcie_port_bus_resume(struct device *dev);
  21
  22 struct bus_type pcie_port_bus_type = {
  23         .name           = "pci_express",
  24         .match          = pcie_port_bus_match,
  25         .suspend        = pcie_port_bus_suspend,
  26         .resume         = pcie_port_bus_resume,
  27 };
  28 EXPORT_SYMBOL_GPL(pcie_port_bus_type);
  29
  30 static int pcie_port_bus_match(struct device *dev, struct device_driver *drv)
  31 {
  32         struct pcie_device *pciedev;
  33         struct pcie_port_service_driver *driver;
  34
  35         if (drv->bus != &pcie_port_bus_type || dev->bus != &pcie_port_bus_type)
  36                 return 0;
  37
  38         pciedev = to_pcie_device(dev);
  39         driver = to_service_driver(drv);
  40         if (   (driver->id_table->vendor != PCI_ANY_ID &&
  41                 driver->id_table->vendor != pciedev->id.vendor) ||
  42                (driver->id_table->device != PCI_ANY_ID &&
  43                 driver->id_table->device != pciedev->id.device) ||
  44                (driver->id_table->port_type != PCIE_ANY_PORT &&
  45                 driver->id_table->port_type != pciedev->id.port_type) ||
  46                 driver->id_table->service_type != pciedev->id.service_type )
  47                 return 0;
  48
  49         return 1;
  50 }
  51
  52 static int pcie_port_bus_suspend(struct device *dev, pm_message_t state)
  53 {
  54         struct pcie_device *pciedev;
  55         struct pcie_port_service_driver *driver;
  56
  57         if (!dev || !dev->driver)
  58                 return 0;
  59
  60         pciedev = to_pcie_device(dev);
  61         driver = to_service_driver(dev->driver);
  62         if (driver && driver->suspend)
  63                 driver->suspend(pciedev, state);
  64         return 0;
  65 }
  66
  67 static int pcie_port_bus_resume(struct device *dev)
  68 {
  69         struct pcie_device *pciedev;
  70         struct pcie_port_service_driver *driver;
  71
  72         if (!dev || !dev->driver)
  73                 return 0;
  74
  75         pciedev = to_pcie_device(dev);
  76         driver = to_service_driver(dev->driver);
  77         if (driver && driver->resume)
  78                 driver->resume(pciedev);
  79         return 0;
  80 }