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/interrupt.h>
  21
  22#include "comedi_pci.h"
  23
  24/**
  25 * comedi_to_pci_dev() - comedi_device pointer to pci_dev pointer.
  26 * @dev: comedi_device struct
  27 */
  28struct pci_dev *comedi_to_pci_dev(struct comedi_device *dev)
  29{
  30        return dev->hw_dev ? to_pci_dev(dev->hw_dev) : NULL;
  31}
  32EXPORT_SYMBOL_GPL(comedi_to_pci_dev);
  33
  34/**
  35 * comedi_pci_enable() - Enable the PCI device and request the regions.
  36 * @dev: comedi_device struct
  37 */
  38int comedi_pci_enable(struct comedi_device *dev)
  39{
  40        struct pci_dev *pcidev = comedi_to_pci_dev(dev);
  41        int rc;
  42
  43        if (!pcidev)
  44                return -ENODEV;
  45
  46        rc = pci_enable_device(pcidev);
  47        if (rc < 0)
  48                return rc;
  49
  50        rc = pci_request_regions(pcidev, dev->board_name);
  51        if (rc < 0)
  52                pci_disable_device(pcidev);
  53        else
  54                dev->ioenabled = true;
  55
  56        return rc;
  57}
  58EXPORT_SYMBOL_GPL(comedi_pci_enable);
  59
  60/**
  61 * comedi_pci_disable() - Release the regions and disable the PCI device.
  62 * @dev: comedi_device struct
  63 */
  64void comedi_pci_disable(struct comedi_device *dev)
  65{
  66        struct pci_dev *pcidev = comedi_to_pci_dev(dev);
  67
  68        if (pcidev && dev->ioenabled) {
  69                pci_release_regions(pcidev);
  70                pci_disable_device(pcidev);
  71        }
  72        dev->ioenabled = false;
  73}
  74EXPORT_SYMBOL_GPL(comedi_pci_disable);
  75
  76/**
  77 * comedi_pci_detach() - A generic (*detach) function for PCI drivers.
  78 * @dev: comedi_device struct
  79 */
  80void comedi_pci_detach(struct comedi_device *dev)
  81{
  82        struct pci_dev *pcidev = comedi_to_pci_dev(dev);
  83
  84        if (!pcidev || !dev->ioenabled)
  85                return;
  86
  87        if (dev->irq) {
  88                free_irq(dev->irq, dev);
  89                dev->irq = 0;
  90        }
  91        if (dev->mmio) {
  92                iounmap(dev->mmio);
  93                dev->mmio = NULL;
  94        }
  95        comedi_pci_disable(dev);
  96}
  97EXPORT_SYMBOL_GPL(comedi_pci_detach);
  98
  99/**
 100 * comedi_pci_auto_config() - Configure/probe a comedi PCI driver.
 101 * @pcidev: pci_dev struct
 102 * @driver: comedi_driver struct
 103 * @context: driver specific data, passed to comedi_auto_config()
 104 *
 105 * Typically called from the pci_driver (*probe) function.
 106 */
 107int comedi_pci_auto_config(struct pci_dev *pcidev,
 108                           struct comedi_driver *driver,
 109                           unsigned long context)
 110{
 111        return comedi_auto_config(&pcidev->dev, driver, context);
 112}
 113EXPORT_SYMBOL_GPL(comedi_pci_auto_config);
 114
 115/**
 116 * comedi_pci_auto_unconfig() - Unconfigure/remove a comedi PCI driver.
 117 * @pcidev: pci_dev struct
 118 *
 119 * Typically called from the pci_driver (*remove) function.
 120 */
 121void comedi_pci_auto_unconfig(struct pci_dev *pcidev)
 122{
 123        comedi_auto_unconfig(&pcidev->dev);
 124}
 125EXPORT_SYMBOL_GPL(comedi_pci_auto_unconfig);
 126
 127/**
 128 * comedi_pci_driver_register() - Register a comedi PCI driver.
 129 * @comedi_driver: comedi_driver struct
 130 * @pci_driver: pci_driver struct
 131 *
 132 * This function is used for the module_init() of comedi PCI drivers.
 133 * Do not call it directly, use the module_comedi_pci_driver() helper
 134 * macro instead.
 135 */
 136int comedi_pci_driver_register(struct comedi_driver *comedi_driver,
 137                               struct pci_driver *pci_driver)
 138{
 139        int ret;
 140
 141        ret = comedi_driver_register(comedi_driver);
 142        if (ret < 0)
 143                return ret;
 144
 145        ret = pci_register_driver(pci_driver);
 146        if (ret < 0) {
 147                comedi_driver_unregister(comedi_driver);
 148                return ret;
 149        }
 150
 151        return 0;
 152}
 153EXPORT_SYMBOL_GPL(comedi_pci_driver_register);
 154
 155/**
 156 * comedi_pci_driver_unregister() - Unregister a comedi PCI driver.
 157 * @comedi_driver: comedi_driver struct
 158 * @pci_driver: pci_driver struct
 159 *
 160 * This function is used for the module_exit() of comedi PCI drivers.
 161 * Do not call it directly, use the module_comedi_pci_driver() helper
 162 * macro instead.
 163 */
 164void comedi_pci_driver_unregister(struct comedi_driver *comedi_driver,
 165                                  struct pci_driver *pci_driver)
 166{
 167        pci_unregister_driver(pci_driver);
 168        comedi_driver_unregister(comedi_driver);
 169}
 170EXPORT_SYMBOL_GPL(comedi_pci_driver_unregister);
 171
 172static int __init comedi_pci_init(void)
 173{
 174        return 0;
 175}
 176module_init(comedi_pci_init);
 177
 178static void __exit comedi_pci_exit(void)
 179{
 180}
 181module_exit(comedi_pci_exit);
 182
 183MODULE_AUTHOR("http://www.comedi.org");
 184MODULE_DESCRIPTION("Comedi PCI interface module");
 185MODULE_LICENSE("GPL");
 186