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
  19 #include <linux/pci.h>
  20 #include <linux/interrupt.h>
  21
  22 #include "comedidev.h"
  23
  24 /**
  25  * comedi_to_pci_dev() - comedi_device pointer to pci_dev pointer.
  26  * @dev: comedi_device struct
  27  */
  28 struct pci_dev *comedi_to_pci_dev(struct comedi_device *dev)
  29 {
  30         return dev->hw_dev ? to_pci_dev(dev->hw_dev) : NULL;
  31 }
  32 EXPORT_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  */
  38 int 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 }
  58 EXPORT_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  */
  64 void 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 }
  74 EXPORT_SYMBOL_GPL(comedi_pci_disable);
  75
  76 /**
  77  * comedi_pci_detach() - A generic (*detach) function for PCI drivers.
  78  * @dev: comedi_device struct
  79  */
  80 void 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 }
  97 EXPORT_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  */
 107 int 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 }
 113 EXPORT_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  */
 121 void comedi_pci_auto_unconfig(struct pci_dev *pcidev)
 122 {
 123         comedi_auto_unconfig(&pcidev->dev);
 124 }
 125 EXPORT_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  */
 136 int 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 }
 153 EXPORT_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  */
 164 void 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 }
 170 EXPORT_SYMBOL_GPL(comedi_pci_driver_unregister);