drivers/staging/comedi/comedi_pci.c

   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  */
  31 struct pci_dev *comedi_to_pci_dev(struct comedi_device *dev)
  32 {
  33         return dev->hw_dev ? to_pci_dev(dev->hw_dev) : NULL;
  34 }
  35 EXPORT_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  */
  41 int 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                                                 ? dev->board_name
  55                                                 : dev->driver->driver_name);
  56         if (rc < 0)
  57                 pci_disable_device(pcidev);
  58         else
  59                 dev->ioenabled = true;
  60
  61         return rc;
  62 }
  63 EXPORT_SYMBOL_GPL(comedi_pci_enable);
  64
  65 /**
  66  * comedi_pci_disable() - Release the regions and disable the PCI device.
  67  * @dev: comedi_device struct
  68  */
  69 void comedi_pci_disable(struct comedi_device *dev)
  70 {
  71         struct pci_dev *pcidev = comedi_to_pci_dev(dev);
  72
  73         if (pcidev && dev->ioenabled) {
  74                 pci_release_regions(pcidev);
  75                 pci_disable_device(pcidev);
  76         }
  77         dev->ioenabled = false;
  78 }
  79 EXPORT_SYMBOL_GPL(comedi_pci_disable);
  80
  81 /**
  82  * comedi_pci_auto_config() - Configure/probe a comedi PCI driver.
  83  * @pcidev: pci_dev struct
  84  * @driver: comedi_driver struct
  85  * @context: driver specific data, passed to comedi_auto_config()
  86  *
  87  * Typically called from the pci_driver (*probe) function.
  88  */
  89 int comedi_pci_auto_config(struct pci_dev *pcidev,
  90                            struct comedi_driver *driver,
  91                            unsigned long context)
  92 {
  93         return comedi_auto_config(&pcidev->dev, driver, context);
  94 }
  95 EXPORT_SYMBOL_GPL(comedi_pci_auto_config);
  96
  97 /**
  98  * comedi_pci_auto_unconfig() - Unconfigure/remove a comedi PCI driver.
  99  * @pcidev: pci_dev struct
 100  *
 101  * Typically called from the pci_driver (*remove) function.
 102  */
 103 void comedi_pci_auto_unconfig(struct pci_dev *pcidev)
 104 {
 105         comedi_auto_unconfig(&pcidev->dev);
 106 }
 107 EXPORT_SYMBOL_GPL(comedi_pci_auto_unconfig);
 108
 109 /**
 110  * comedi_pci_driver_register() - Register a comedi PCI driver.
 111  * @comedi_driver: comedi_driver struct
 112  * @pci_driver: pci_driver struct
 113  *
 114  * This function is used for the module_init() of comedi PCI drivers.
 115  * Do not call it directly, use the module_comedi_pci_driver() helper
 116  * macro instead.
 117  */
 118 int comedi_pci_driver_register(struct comedi_driver *comedi_driver,
 119                                struct pci_driver *pci_driver)
 120 {
 121         int ret;
 122
 123         ret = comedi_driver_register(comedi_driver);
 124         if (ret < 0)
 125                 return ret;
 126
 127         ret = pci_register_driver(pci_driver);
 128         if (ret < 0) {
 129                 comedi_driver_unregister(comedi_driver);
 130                 return ret;
 131         }
 132
 133         return 0;
 134 }
 135 EXPORT_SYMBOL_GPL(comedi_pci_driver_register);
 136
 137 /**
 138  * comedi_pci_driver_unregister() - Unregister a comedi PCI driver.
 139  * @comedi_driver: comedi_driver struct
 140  * @pci_driver: pci_driver struct
 141  *
 142  * This function is used for the module_exit() of comedi PCI drivers.
 143  * Do not call it directly, use the module_comedi_pci_driver() helper
 144  * macro instead.
 145  */
 146 void comedi_pci_driver_unregister(struct comedi_driver *comedi_driver,
 147                                   struct pci_driver *pci_driver)
 148 {
 149         pci_unregister_driver(pci_driver);
 150         comedi_driver_unregister(comedi_driver);
 151 }
 152 EXPORT_SYMBOL_GPL(comedi_pci_driver_unregister);