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, u32 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
  28 static int pcie_port_bus_match(struct device *dev, struct device_driver *drv)
  29 {
  30         struct pcie_device *pciedev;
  31         struct pcie_port_service_driver *driver;
  32
  33         if (drv->bus != &pcie_port_bus_type || dev->bus != &pcie_port_bus_type)
  34                 return 0;
  35
  36         pciedev = to_pcie_device(dev);
  37         driver = to_service_driver(drv);
  38         if (   (driver->id_table->vendor != PCI_ANY_ID &&
  39                 driver->id_table->vendor != pciedev->id.vendor) ||
  40                (driver->id_table->device != PCI_ANY_ID &&
  41                 driver->id_table->device != pciedev->id.device) ||
  42                 driver->id_table->port_type != pciedev->id.port_type ||
  43                 driver->id_table->service_type != pciedev->id.service_type )
  44                 return 0;
  45
  46         return 1;
  47 }
  48
  49 static int pcie_port_bus_suspend(struct device *dev, u32 state)
  50 {
  51         struct pcie_device *pciedev;
  52         struct pcie_port_service_driver *driver;
  53
  54         if (!dev || !dev->driver)
  55                 return 0;
  56
  57         pciedev = to_pcie_device(dev);
  58         driver = to_service_driver(dev->driver);
  59         if (driver && driver->suspend)
  60                 driver->suspend(pciedev, state);
  61         return 0;
  62 }
  63
  64 static int pcie_port_bus_resume(struct device *dev)
  65 {
  66         struct pcie_device *pciedev;
  67         struct pcie_port_service_driver *driver;
  68
  69         if (!dev || !dev->driver)
  70                 return 0;
  71
  72         pciedev = to_pcie_device(dev);
  73         driver = to_service_driver(dev->driver);
  74         if (driver && driver->resume)
  75                 driver->resume(pciedev);
  76         return 0;
  77 }