drivers/staging/comedi/comedi_pcmcia.c

   1 /*
   2  * comedi_pcmcia.c
   3  * Comedi PCMCIA 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/kernel.h>
  20
  21 #include <pcmcia/cistpl.h>
  22 #include <pcmcia/ds.h>
  23
  24 #include "comedidev.h"
  25
  26 /**
  27  * comedi_to_pcmcia_dev() - comedi_device pointer to pcmcia_device pointer.
  28  * @dev: comedi_device struct
  29  */
  30 struct pcmcia_device *comedi_to_pcmcia_dev(struct comedi_device *dev)
  31 {
  32         return dev->hw_dev ? to_pcmcia_dev(dev->hw_dev) : NULL;
  33 }
  34 EXPORT_SYMBOL_GPL(comedi_to_pcmcia_dev);
  35
  36 static int comedi_pcmcia_conf_check(struct pcmcia_device *link,
  37                                     void *priv_data)
  38 {
  39         if (link->config_index == 0)
  40                 return -EINVAL;
  41
  42         return pcmcia_request_io(link);
  43 }
  44
  45 /**
  46  * comedi_pcmcia_enable() - Request the regions and enable the PCMCIA device.
  47  * @dev: comedi_device struct
  48  * @conf_check: optional callback to check the pcmcia_device configuration
  49  *
  50  * The comedi PCMCIA driver needs to set the link->config_flags, as
  51  * appropriate for that driver, before calling this function in order
  52  * to allow pcmcia_loop_config() to do its internal autoconfiguration.
  53  */
  54 int comedi_pcmcia_enable(struct comedi_device *dev,
  55                          int (*conf_check)(struct pcmcia_device *, void *))
  56 {
  57         struct pcmcia_device *link = comedi_to_pcmcia_dev(dev);
  58         int ret;
  59
  60         if (!link)
  61                 return -ENODEV;
  62
  63         if (!conf_check)
  64                 conf_check = comedi_pcmcia_conf_check;
  65
  66         ret = pcmcia_loop_config(link, conf_check, NULL);
  67         if (ret)
  68                 return ret;
  69
  70         return pcmcia_enable_device(link);
  71 }
  72 EXPORT_SYMBOL_GPL(comedi_pcmcia_enable);
  73
  74 /**
  75  * comedi_pcmcia_disable() - Disable the PCMCIA device and release the regions.
  76  * @dev: comedi_device struct
  77  */
  78 void comedi_pcmcia_disable(struct comedi_device *dev)
  79 {
  80         struct pcmcia_device *link = comedi_to_pcmcia_dev(dev);
  81
  82         if (link)
  83                 pcmcia_disable_device(link);
  84 }
  85 EXPORT_SYMBOL_GPL(comedi_pcmcia_disable);
  86
  87 /**
  88  * comedi_pcmcia_auto_config() - Configure/probe a comedi PCMCIA driver.
  89  * @link: pcmcia_device struct
  90  * @driver: comedi_driver struct
  91  *
  92  * Typically called from the pcmcia_driver (*probe) function.
  93  */
  94 int comedi_pcmcia_auto_config(struct pcmcia_device *link,
  95                               struct comedi_driver *driver)
  96 {
  97         return comedi_auto_config(&link->dev, driver, 0);
  98 }
  99 EXPORT_SYMBOL_GPL(comedi_pcmcia_auto_config);
 100
 101 /**
 102  * comedi_pcmcia_auto_unconfig() - Unconfigure/remove a comedi PCMCIA driver.
 103  * @link: pcmcia_device struct
 104  *
 105  * Typically called from the pcmcia_driver (*remove) function.
 106  */
 107 void comedi_pcmcia_auto_unconfig(struct pcmcia_device *link)
 108 {
 109         comedi_auto_unconfig(&link->dev);
 110 }
 111 EXPORT_SYMBOL_GPL(comedi_pcmcia_auto_unconfig);
 112
 113 /**
 114  * comedi_pcmcia_driver_register() - Register a comedi PCMCIA driver.
 115  * @comedi_driver: comedi_driver struct
 116  * @pcmcia_driver: pcmcia_driver struct
 117  *
 118  * This function is used for the module_init() of comedi USB drivers.
 119  * Do not call it directly, use the module_comedi_pcmcia_driver() helper
 120  * macro instead.
 121  */
 122 int comedi_pcmcia_driver_register(struct comedi_driver *comedi_driver,
 123                                   struct pcmcia_driver *pcmcia_driver)
 124 {
 125         int ret;
 126
 127         ret = comedi_driver_register(comedi_driver);
 128         if (ret < 0)
 129                 return ret;
 130
 131         ret = pcmcia_register_driver(pcmcia_driver);
 132         if (ret < 0) {
 133                 comedi_driver_unregister(comedi_driver);
 134                 return ret;
 135         }
 136
 137         return 0;
 138 }
 139 EXPORT_SYMBOL_GPL(comedi_pcmcia_driver_register);
 140
 141 /**
 142  * comedi_pcmcia_driver_unregister() - Unregister a comedi PCMCIA driver.
 143  * @comedi_driver: comedi_driver struct
 144  * @pcmcia_driver: pcmcia_driver struct
 145  *
 146  * This function is used for the module_exit() of comedi PCMCIA drivers.
 147  * Do not call it directly, use the module_comedi_pcmcia_driver() helper
 148  * macro instead.
 149  */
 150 void comedi_pcmcia_driver_unregister(struct comedi_driver *comedi_driver,
 151                                      struct pcmcia_driver *pcmcia_driver)
 152 {
 153         pcmcia_unregister_driver(pcmcia_driver);
 154         comedi_driver_unregister(comedi_driver);
 155 }
 156 EXPORT_SYMBOL_GPL(comedi_pcmcia_driver_unregister);