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 * You should have received a copy of the GNU General Public License
  19 * along with this program; if not, write to the Free Software
  20 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21 */
  22
  23#include <linux/pci.h>
  24
  25#include "comedidev.h"
  26
  27/**
  28 * comedi_to_pci_dev() - comedi_device pointer to pci_dev pointer.
  29 * @dev: comedi_device struct
  30 */
  31struct pci_dev *comedi_to_pci_dev(struct comedi_device *dev)
  32{
  33        return dev->hw_dev ? to_pci_dev(dev->hw_dev) : NULL;
  34}
  35EXPORT_SYMBOL_GPL(comedi_to_pci_dev);
  36
  37/**
  38 * comedi_pci_enable() - Enable the PCI device and request the regions.
  39 * @dev: comedi_device struct
  40 */
  41int comedi_pci_enable(struct comedi_device *dev)
  42{
  43        struct pci_dev *pcidev = comedi_to_pci_dev(dev);
  44        int rc;
  45
  46        if (!pcidev)
  47                return -ENODEV;
  48
  49        rc = pci_enable_device(pcidev);
  50        if (rc < 0)
  51                return rc;
  52
  53        rc = pci_request_regions(pcidev, dev->board_name);
  54        if (rc < 0)
  55                pci_disable_device(pcidev);
  56        else
  57                dev->ioenabled = true;
  58
  59        return rc;
  60}
  61EXPORT_SYMBOL_GPL(comedi_pci_enable);
  62
  63/**
  64 * comedi_pci_disable() - Release the regions and disable the PCI device.
  65 * @dev: comedi_device struct
  66 */
  67void comedi_pci_disable(struct comedi_device *dev)
  68{
  69        struct pci_dev *pcidev = comedi_to_pci_dev(dev);
  70
  71        if (pcidev && dev->ioenabled) {
  72                pci_release_regions(pcidev);
  73                pci_disable_device(pcidev);
  74        }
  75        dev->ioenabled = false;
  76}
  77EXPORT_SYMBOL_GPL(comedi_pci_disable);
  78
  79/**
  80 * comedi_pci_auto_config() - Configure/probe a comedi PCI driver.
  81 * @pcidev: pci_dev struct
  82 * @driver: comedi_driver struct
  83 * @context: driver specific data, passed to comedi_auto_config()
  84 *
  85 * Typically called from the pci_driver (*probe) function.
  86 */
  87int comedi_pci_auto_config(struct pci_dev *pcidev,
  88                           struct comedi_driver *driver,
  89                           unsigned long context)
  90{
  91        return comedi_auto_config(&pcidev->dev, driver, context);
  92}
  93EXPORT_SYMBOL_GPL(comedi_pci_auto_config);
  94
  95/**
  96 * comedi_pci_auto_unconfig() - Unconfigure/remove a comedi PCI driver.
  97 * @pcidev: pci_dev struct
  98 *
  99 * Typically called from the pci_driver (*remove) function.
 100 */
 101void comedi_pci_auto_unconfig(struct pci_dev *pcidev)
 102{
 103        comedi_auto_unconfig(&pcidev->dev);
 104}
 105EXPORT_SYMBOL_GPL(comedi_pci_auto_unconfig);
 106
 107/**
 108 * comedi_pci_driver_register() - Register a comedi PCI driver.
 109 * @comedi_driver: comedi_driver struct
 110 * @pci_driver: pci_driver struct
 111 *
 112 * This function is used for the module_init() of comedi PCI drivers.
 113 * Do not call it directly, use the module_comedi_pci_driver() helper
 114 * macro instead.
 115 */
 116int comedi_pci_driver_register(struct comedi_driver *comedi_driver,
 117                               struct pci_driver *pci_driver)
 118{
 119        int ret;
 120
 121        ret = comedi_driver_register(comedi_driver);
 122        if (ret < 0)
 123                return ret;
 124
 125        ret = pci_register_driver(pci_driver);
 126        if (ret < 0) {
 127                comedi_driver_unregister(comedi_driver);
 128                return ret;
 129        }
 130
 131        return 0;
 132}
 133EXPORT_SYMBOL_GPL(comedi_pci_driver_register);
 134
 135/**
 136 * comedi_pci_driver_unregister() - Unregister a comedi PCI driver.
 137 * @comedi_driver: comedi_driver struct
 138 * @pci_driver: pci_driver struct
 139 *
 140 * This function is used for the module_exit() of comedi PCI drivers.
 141 * Do not call it directly, use the module_comedi_pci_driver() helper
 142 * macro instead.
 143 */
 144void comedi_pci_driver_unregister(struct comedi_driver *comedi_driver,
 145                                  struct pci_driver *pci_driver)
 146{
 147        pci_unregister_driver(pci_driver);
 148        comedi_driver_unregister(comedi_driver);
 149}
 150EXPORT_SYMBOL_GPL(comedi_pci_driver_unregister);
 151