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