LXR linux/drivers/staging/comedi/comedi

   1/*
   2 * comedi_usb.c
   3 * Comedi USB 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/usb.h>
  20
  21#include "comedidev.h"
  22
  23/**
  24 * comedi_to_usb_interface() - comedi_device pointer to usb_interface pointer.
  25 * @dev: comedi_device struct
  26 */
  27struct usb_interface *comedi_to_usb_interface(struct comedi_device *dev)
  28{
  29        return dev->hw_dev ? to_usb_interface(dev->hw_dev) : NULL;
  30}
  31EXPORT_SYMBOL_GPL(comedi_to_usb_interface);
  32
  33/**
  34 * comedi_to_usb_dev() - comedi_device pointer to usb_device pointer.
  35 * @dev: comedi_device struct
  36 */
  37struct usb_device *comedi_to_usb_dev(struct comedi_device *dev)
  38{
  39        struct usb_interface *intf = comedi_to_usb_interface(dev);
  40
  41        return intf ? interface_to_usbdev(intf) : NULL;
  42}
  43EXPORT_SYMBOL_GPL(comedi_to_usb_dev);
  44
  45/**
  46 * comedi_usb_auto_config() - Configure/probe a comedi USB driver.
  47 * @intf: usb_interface struct
  48 * @driver: comedi_driver struct
  49 * @context: driver specific data, passed to comedi_auto_config()
  50 *
  51 * Typically called from the usb_driver (*probe) function.
  52 */
  53int comedi_usb_auto_config(struct usb_interface *intf,
  54                           struct comedi_driver *driver,
  55                           unsigned long context)
  56{
  57        return comedi_auto_config(&intf->dev, driver, context);
  58}
  59EXPORT_SYMBOL_GPL(comedi_usb_auto_config);
  60
  61/**
  62 * comedi_pci_auto_unconfig() - Unconfigure/disconnect a comedi USB driver.
  63 * @intf: usb_interface struct
  64 *
  65 * Typically called from the usb_driver (*disconnect) function.
  66 */
  67void comedi_usb_auto_unconfig(struct usb_interface *intf)
  68{
  69        comedi_auto_unconfig(&intf->dev);
  70}
  71EXPORT_SYMBOL_GPL(comedi_usb_auto_unconfig);
  72
  73/**
  74 * comedi_usb_driver_register() - Register a comedi USB driver.
  75 * @comedi_driver: comedi_driver struct
  76 * @usb_driver: usb_driver struct
  77 *
  78 * This function is used for the module_init() of comedi USB drivers.
  79 * Do not call it directly, use the module_comedi_usb_driver() helper
  80 * macro instead.
  81 */
  82int comedi_usb_driver_register(struct comedi_driver *comedi_driver,
  83                               struct usb_driver *usb_driver)
  84{
  85        int ret;
  86
  87        ret = comedi_driver_register(comedi_driver);
  88        if (ret < 0)
  89                return ret;
  90
  91        ret = usb_register(usb_driver);
  92        if (ret < 0) {
  93                comedi_driver_unregister(comedi_driver);
  94                return ret;
  95        }
  96
  97        return 0;
  98}
  99EXPORT_SYMBOL_GPL(comedi_usb_driver_register);
 100
 101/**
 102 * comedi_usb_driver_unregister() - Unregister a comedi USB driver.
 103 * @comedi_driver: comedi_driver struct
 104 * @usb_driver: usb_driver struct
 105 *
 106 * This function is used for the module_exit() of comedi USB drivers.
 107 * Do not call it directly, use the module_comedi_usb_driver() helper
 108 * macro instead.
 109 */
 110void comedi_usb_driver_unregister(struct comedi_driver *comedi_driver,
 111                                  struct usb_driver *usb_driver)
 112{
 113        usb_deregister(usb_driver);
 114        comedi_driver_unregister(comedi_driver);
 115}
 116EXPORT_SYMBOL_GPL(comedi_usb_driver_unregister);
 117