drivers/staging/comedi/comedi_usb.c

   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  */
  27 struct usb_interface *comedi_to_usb_interface(struct comedi_device *dev)
  28 {
  29         return dev->hw_dev ? to_usb_interface(dev->hw_dev) : NULL;
  30 }
  31 EXPORT_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  */
  37 struct 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 }
  43 EXPORT_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  */
  53 int 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 }
  59 EXPORT_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  */
  67 void comedi_usb_auto_unconfig(struct usb_interface *intf)
  68 {
  69         comedi_auto_unconfig(&intf->dev);
  70 }
  71 EXPORT_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  */
  82 int 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 }
  99 EXPORT_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  */
 110 void 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 }
 116 EXPORT_SYMBOL_GPL(comedi_usb_driver_unregister);