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
|
/*
* Copyright 2018 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "usb_if.h"
/* Return 0 on error, since it's never gonna be EP 0 */
static int find_endpoint(const struct libusb_interface_descriptor *iface,
uint16_t subclass,
uint16_t protocol,
struct usb_endpoint *uep)
{
const struct libusb_endpoint_descriptor *ep;
if (iface->bInterfaceClass == 255 &&
iface->bInterfaceSubClass == subclass &&
iface->bInterfaceProtocol == protocol &&
iface->bNumEndpoints) {
ep = &iface->endpoint[0];
uep->ep_num = ep->bEndpointAddress & 0x7f;
uep->chunk_len = ep->wMaxPacketSize;
return 1;
}
return 0;
}
/* Return -1 on error */
static int find_interface(uint16_t subclass,
uint16_t protocol,
struct usb_endpoint *uep)
{
int iface_num = -1;
int r, i, j;
struct libusb_device *dev;
struct libusb_config_descriptor *conf = 0;
const struct libusb_interface *iface0;
const struct libusb_interface_descriptor *iface;
dev = libusb_get_device(uep->devh);
r = libusb_get_active_config_descriptor(dev, &conf);
if (r < 0) {
USB_ERROR("libusb_get_active_config_descriptor", r);
goto out;
}
for (i = 0; i < conf->bNumInterfaces; i++) {
iface0 = &conf->interface[i];
for (j = 0; j < iface0->num_altsetting; j++) {
iface = &iface0->altsetting[j];
if (find_endpoint(iface, subclass, protocol, uep)) {
iface_num = i;
goto out;
}
}
}
out:
libusb_free_config_descriptor(conf);
return iface_num;
}
static libusb_device_handle *check_device(libusb_device *dev,
uint16_t vid, uint16_t pid, const char *serial)
{
struct libusb_device_descriptor desc;
libusb_device_handle *handle = NULL;
char sn[256];
size_t sn_size = 0;
if (libusb_get_device_descriptor(dev, &desc) < 0)
return NULL;
if (libusb_open(dev, &handle) != LIBUSB_SUCCESS)
return NULL;
if (desc.iSerialNumber && serial) {
sn_size = libusb_get_string_descriptor_ascii(handle,
desc.iSerialNumber, (unsigned char *)sn,
sizeof(sn));
}
/*
* If the VID, PID, and serial number don't match, then it's not the
* correct device. Close the handle and return NULL.
*/
if ((vid && vid != desc.idVendor) ||
(pid && pid != desc.idProduct) ||
(serial && ((sn_size != strlen(serial)) ||
memcmp(sn, serial, sn_size)))) {
libusb_close(handle);
return NULL;
}
return handle;
}
int usb_findit(const char *serial, uint16_t vid, uint16_t pid,
uint16_t subclass, uint16_t protocol, struct usb_endpoint *uep)
{
int iface_num, r, i;
libusb_device **devs;
libusb_device_handle *devh = NULL;
ssize_t count;
memset(uep, 0, sizeof(*uep));
/* Must supply either serial or vendor and product ids. */
if (!serial && !(vid && pid))
goto terminate_usb_findit;
r = libusb_init(NULL);
if (r < 0) {
USB_ERROR("libusb_init", r);
goto terminate_usb_findit;
}
printf("finding_device ");
if (vid)
printf("%04x:%04x ", vid, pid);
if (serial)
printf("%s", serial);
printf("\n");
count = libusb_get_device_list(NULL, &devs);
if (count < 0)
goto terminate_usb_findit;
for (i = 0; i < count; i++) {
devh = check_device(devs[i], vid, pid, serial);
if (devh) {
printf("Found device.\n");
break;
}
}
libusb_free_device_list(devs, 1);
if (!devh) {
fprintf(stderr, "Can't find device\n");
goto terminate_usb_findit;
}
uep->devh = devh;
iface_num = find_interface(subclass, protocol, uep);
if (iface_num < 0) {
fprintf(stderr, "USB interface %d is not found\n", uep->ep_num);
goto terminate_usb_findit;
}
if (!uep->chunk_len) {
fprintf(stderr, "wMaxPacketSize isn't valid\n");
goto terminate_usb_findit;
}
printf("found interface %d endpoint %d, chunk_len %d\n",
iface_num, uep->ep_num, uep->chunk_len);
libusb_set_auto_detach_kernel_driver(uep->devh, 1);
r = libusb_claim_interface(uep->devh, iface_num);
if (r < 0) {
USB_ERROR("libusb_claim_interface", r);
goto terminate_usb_findit;
}
printf("READY\n-------\n");
return 0;
terminate_usb_findit:
if (uep->devh)
usb_shut_down(uep);
return -1;
}
int usb_trx(struct usb_endpoint *uep, void *outbuf, int outlen,
void *inbuf, int inlen, int allow_less, size_t *rxed_count)
{
int r, actual;
/* Send data out */
if (outbuf && outlen) {
actual = 0;
r = libusb_bulk_transfer(uep->devh, uep->ep_num,
outbuf, outlen,
&actual, 1000);
if (r < 0) {
USB_ERROR("libusb_bulk_transfer", r);
return -1;
}
if (actual != outlen) {
fprintf(stderr, "%s:%d, only sent %d/%d bytes\n",
__FILE__, __LINE__, actual, outlen);
usb_shut_down(uep);
}
}
/* Read reply back */
if (inbuf && inlen) {
actual = 0;
r = libusb_bulk_transfer(uep->devh, uep->ep_num | 0x80,
inbuf, inlen,
&actual, 1000);
if (r < 0) {
USB_ERROR("libusb_bulk_transfer", r);
return -1;
}
if ((actual != inlen) && !allow_less) {
fprintf(stderr, "%s:%d, only received %d/%d bytes\n",
__FILE__, __LINE__, actual, inlen);
usb_shut_down(uep);
}
if (rxed_count)
*rxed_count = actual;
}
return 0;
}
void usb_shut_down(struct usb_endpoint *uep)
{
libusb_close(uep->devh);
libusb_exit(NULL);
}
|
