LXR linux/drivers/staging/comedi/comedi

   1/*
   2 * comedi_pci.c
   3 * Comedi PCI driver specific functions.
   4 *
   5 * COMEDI - Linux Control and Measurement Device Interface
   6 * Copyright (C) 1997-2000 David A. Schleef <ds@schleef.org>
   7 *
   8 * This program is free software; you can redistribute it and/or modify
   9 * it under the terms of the GNU General Public License as published by
  10 * the Free Software Foundation; either version 2 of the License, or
  11 * (at your option) any later version.
  12 *
  13 * This program is distributed in the hope that it will be useful,
  14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 * GNU General Public License for more details.
  17 */
  18
  19#include <linux/module.h>
  20#include <linux/pci.h>
  21#include <linux/interrupt.h>
  22
  23#include "comedidev.h"
  24
  25/**
  26 * comedi_to_pci_dev() - comedi_device pointer to pci_dev pointer.
  27 * @dev: comedi_device struct
  28 */
  29struct pci_dev *comedi_to_pci_dev(struct comedi_device *dev)
  30{
  31        return dev->hw_dev ? to_pci_dev(dev->hw_dev) : NULL;
  32}
  33EXPORT_SYMBOL_GPL(comedi_to_pci_dev);
  34
  35/**
  36 * comedi_pci_enable() - Enable the PCI device and request the regions.
  37 * @dev: comedi_device struct
  38 */
  39int comedi_pci_enable(struct comedi_device *dev)
  40{
  41        struct pci_dev *pcidev = comedi_to_pci_dev(dev);
  42        int rc;
  43
  44        if (!pcidev)
  45                return -ENODEV;
  46
  47        rc = pci_enable_device(pcidev);
  48        if (rc < 0)
  49                return rc;
  50
  51        rc = pci_request_regions(pcidev, dev->board_name);
  52        if (rc < 0)
  53                pci_disable_device(pcidev);
  54        else
  55                dev->ioenabled = true;
  56
  57        return rc;
  58}
  59EXPORT_SYMBOL_GPL(comedi_pci_enable);
  60
  61/**
  62 * comedi_pci_disable() - Release the regions and disable the PCI device.
  63 * @dev: comedi_device struct
  64 */
  65void comedi_pci_disable(struct comedi_device *dev)
  66{
  67        struct pci_dev *pcidev = comedi_to_pci_dev(dev);
  68
  69        if (pcidev && dev->ioenabled) {
  70                pci_release_regions(pcidev);
  71                pci_disable_device(pcidev);
  72        }
  73        dev->ioenabled = false;
  74}
  75EXPORT_SYMBOL_GPL(comedi_pci_disable);
  76
  77/**
  78 * comedi_pci_detach() - A generic (*detach) function for PCI drivers.
  79 * @dev: comedi_device struct
  80 */
  81void comedi_pci_detach(struct comedi_device *dev)
  82{
  83        struct pci_dev *pcidev = comedi_to_pci_dev(dev);
  84
  85        if (!pcidev || !dev->ioenabled)
  86                return;
  87
  88        if (dev->irq) {
  89                free_irq(dev->irq, dev);
  90                dev->irq = 0;
  91        }
  92        if (dev->mmio) {
  93                iounmap(dev->mmio);
  94                dev->mmio = NULL;
  95        }
  96        comedi_pci_disable(dev);
  97}
  98EXPORT_SYMBOL_GPL(comedi_pci_detach);
  99
 100/**
 101 * comedi_pci_auto_config() - Configure/probe a comedi PCI driver.
 102 * @pcidev: pci_dev struct
 103 * @driver: comedi_driver struct
 104 * @context: driver specific data, passed to comedi_auto_config()
 105 *
 106 * Typically called from the pci_driver (*probe) function.
 107 */
 108int comedi_pci_auto_config(struct pci_dev *pcidev,
 109                           struct comedi_driver *driver,
 110                           unsigned long context)
 111{
 112        return comedi_auto_config(&pcidev->dev, driver, context);
 113}
 114EXPORT_SYMBOL_GPL(comedi_pci_auto_config);
 115
 116/**
 117 * comedi_pci_auto_unconfig() - Unconfigure/remove a comedi PCI driver.
 118 * @pcidev: pci_dev struct
 119 *
 120 * Typically called from the pci_driver (*remove) function.
 121 */
 122void comedi_pci_auto_unconfig(struct pci_dev *pcidev)
 123{
 124        comedi_auto_unconfig(&pcidev->dev);
 125}
 126EXPORT_SYMBOL_GPL(comedi_pci_auto_unconfig);
 127
 128/**
 129 * comedi_pci_driver_register() - Register a comedi PCI driver.
 130 * @comedi_driver: comedi_driver struct
 131 * @pci_driver: pci_driver struct
 132 *
 133 * This function is used for the module_init() of comedi PCI drivers.
 134 * Do not call it directly, use the module_comedi_pci_driver() helper
 135 * macro instead.
 136 */
 137int comedi_pci_driver_register(struct comedi_driver *comedi_driver,
 138                               struct pci_driver *pci_driver)
 139{
 140        int ret;
 141
 142        ret = comedi_driver_register(comedi_driver);
 143        if (ret < 0)
 144                return ret;
 145
 146        ret = pci_register_driver(pci_driver);
 147        if (ret < 0) {
 148                comedi_driver_unregister(comedi_driver);
 149                return ret;
 150        }
 151
 152        return 0;
 153}
 154EXPORT_SYMBOL_GPL(comedi_pci_driver_register);
 155
 156/**
 157 * comedi_pci_driver_unregister() - Unregister a comedi PCI driver.
 158 * @comedi_driver: comedi_driver struct
 159 * @pci_driver: pci_driver struct
 160 *
 161 * This function is used for the module_exit() of comedi PCI drivers.
 162 * Do not call it directly, use the module_comedi_pci_driver() helper
 163 * macro instead.
 164 */
 165void comedi_pci_driver_unregister(struct comedi_driver *comedi_driver,
 166                                  struct pci_driver *pci_driver)
 167{
 168        pci_unregister_driver(pci_driver);
 169        comedi_driver_unregister(comedi_driver);
 170}
 171EXPORT_SYMBOL_GPL(comedi_pci_driver_unregister);
 172
 173static int __init comedi_pci_init(void)
 174{
 175        return 0;
 176}
 177module_init(comedi_pci_init);
 178
 179static void __exit comedi_pci_exit(void)
 180{
 181}
 182module_exit(comedi_pci_exit);
 183
 184MODULE_AUTHOR("http://www.comedi.org");
 185MODULE_DESCRIPTION("Comedi PCI interface module");
 186MODULE_LICENSE("GPL");
 187