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