1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
|
/** @file
* @brief usbhid-dump - interface list
*
* Copyright (C) 2010 Nikolai Kondrashov
*
* This file is part of usbhid-dump.
*
* Usbhid-dump is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* Usbhid-dump is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with usbhid-dump; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* @author Nikolai Kondrashov <spbnick@gmail.com>
*
* @(#) $Id$
*/
#include "config.h"
#include "uhd/iface_list.h"
#include "uhd/misc.h"
#include <assert.h>
#include <stdlib.h>
#include <stdio.h>
bool
uhd_iface_list_valid(const uhd_iface *list)
{
UHD_IFACE_LIST_FOR_EACH(list, list)
if (!uhd_iface_valid(list))
return false;
return true;
}
size_t
uhd_iface_list_len(const uhd_iface *list)
{
size_t len = 0;
UHD_IFACE_LIST_FOR_EACH(list, list)
len++;
return len;
}
void
uhd_iface_list_free(uhd_iface *list)
{
uhd_iface *next;
for (; list != NULL; list = next)
{
next = list->next;
uhd_iface_free(list);
}
}
enum libusb_error
uhd_iface_list_new(uhd_dev *dev_list,
uhd_iface **plist)
{
enum libusb_error err = LIBUSB_ERROR_OTHER;
uhd_dev *dev;
struct libusb_config_descriptor *config = NULL;
const struct libusb_interface *lusb_iface;
const struct libusb_interface_descriptor *iface_desc;
const uhd_hid_descriptor *hid_desc;
const uhd_hid_descriptor_extra *hid_desc_extra;
uint16_t rd_len;
const struct libusb_endpoint_descriptor *ep_list;
uint8_t ep_num;
const struct libusb_endpoint_descriptor *ep;
uhd_iface *list = NULL;
uhd_iface *iface;
assert(uhd_dev_list_valid(dev_list));
UHD_DEV_LIST_FOR_EACH(dev, dev_list)
{
/* Retrieve active configuration descriptor */
err = libusb_get_active_config_descriptor(libusb_get_device(dev->handle),
&config);
if (err != LIBUSB_SUCCESS)
goto cleanup;
/*
* Build the matching interface list
*/
/* For each interface */
for (lusb_iface = config->interface;
lusb_iface - config->interface < config->bNumInterfaces;
lusb_iface++)
{
/* Skip interfaces with altsettings */
if (lusb_iface->num_altsetting != 1)
continue;
iface_desc = lusb_iface->altsetting;
/* Skip non-HID interfaces */
if (iface_desc->bInterfaceClass != LIBUSB_CLASS_HID)
continue;
/*
* Try to retrieve report descriptor length
*/
rd_len = UHD_MAX_DESCRIPTOR_SIZE;
/* If interface descriptor has space for a HID descriptor */
if (iface_desc->extra_length >= (int)sizeof(uhd_hid_descriptor))
{
hid_desc = (const uhd_hid_descriptor *)iface_desc->extra;
/* If this is truly a HID class descriptor */
if (hid_desc->bDescriptorType == LIBUSB_DT_HID)
{
/* For each extra HID descriptor entry */
for (hid_desc_extra = hid_desc->extra;
hid_desc_extra <
hid_desc->extra + hid_desc->bNumDescriptors &&
(uint8_t *)hid_desc_extra <
(uint8_t *)hid_desc + hid_desc->bLength &&
(unsigned char *)hid_desc_extra <
iface_desc->extra +
iface_desc->extra_length;
hid_desc_extra++) {
/* If this is a report descriptor entry */
if (hid_desc_extra->bDescriptorType ==
LIBUSB_DT_REPORT)
{
rd_len = hid_desc_extra->wDescriptorLength;
break;
}
}
}
}
/* Retrieve endpoint list */
ep_list = iface_desc->endpoint;
ep_num = iface_desc->bNumEndpoints;
/* For each endpoint */
for (ep = ep_list; (ep - ep_list) < ep_num; ep++)
{
/* Skip non-interrupt and non-in endpoints */
if ((ep->bmAttributes & LIBUSB_TRANSFER_TYPE_MASK) !=
LIBUSB_TRANSFER_TYPE_INTERRUPT ||
(ep->bEndpointAddress & LIBUSB_ENDPOINT_DIR_MASK) !=
LIBUSB_ENDPOINT_IN)
continue;
/* Create the interface */
iface = uhd_iface_new(
dev,
iface_desc->bInterfaceNumber,
ep->bEndpointAddress, ep->wMaxPacketSize,
rd_len);
if (iface == NULL)
{
err = LIBUSB_ERROR_NO_MEM;
goto cleanup;
}
/* Add the interface */
iface->next = list;
list = iface;
break;
}
}
/* Free the config descriptor */
libusb_free_config_descriptor(config);
config = NULL;
}
/* Output the resulting list, if requested */
assert(uhd_iface_list_valid(list));
if (plist != NULL)
{
*plist = list;
list = NULL;
}
/* Done! */
err = LIBUSB_SUCCESS;
cleanup:
libusb_free_config_descriptor(config);
uhd_iface_list_free(list);
return err;
}
uhd_iface *
uhd_iface_list_fltr_by_num(uhd_iface *list,
uint8_t number)
{
uhd_iface *prev;
uhd_iface *iface;
uhd_iface *next;
assert(uhd_iface_list_valid(list));
assert(number < UINT8_MAX);
for (prev = NULL, iface = list; iface != NULL; iface = next)
{
next = iface->next;
if (iface->number == number)
prev = iface;
else
{
if (prev == NULL)
list = next;
else
prev->next = next;
uhd_iface_free(iface);
}
}
return list;
}
|
