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