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
|
#include <libusb.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#define VENDOR 0x1d6b
#define PRODUCT 0x0105
/* endpoints indexes */
#define EP_BULK_IN (1 | LIBUSB_ENDPOINT_IN)
#define EP_BULK_OUT (2 | LIBUSB_ENDPOINT_OUT)
#define BUF_LEN 8192
/*
* struct test_state - describes test program state
* @list: list of devices returned by libusb_get_device_list function
* @found: pointer to struct describing tested device
* @ctx: context, set to NULL
* @handle: handle of tested device
* @attached: indicates that device was attached to kernel, and has to be
* reattached at the end of test program
*/
struct test_state {
libusb_device *found;
libusb_context *ctx;
libusb_device_handle *handle;
int attached;
};
/*
* test_init - initialize test program
*/
int test_init(struct test_state *state)
{
int i, ret;
ssize_t cnt;
libusb_device **list;
state->found = NULL;
state->ctx = NULL;
state->handle = NULL;
state->attached = 0;
ret = libusb_init(&state->ctx);
if (ret) {
printf("cannot init libusb: %s\n", libusb_error_name(ret));
return 1;
}
cnt = libusb_get_device_list(state->ctx, &list);
if (cnt <= 0) {
printf("no devices found\n");
goto error1;
}
for (i = 0; i < cnt; ++i) {
libusb_device *dev = list[i];
struct libusb_device_descriptor desc;
ret = libusb_get_device_descriptor(dev, &desc);
if (ret) {
printf("unable to get device descriptor: %s\n",
libusb_error_name(ret));
goto error2;
}
if (desc.idVendor == VENDOR && desc.idProduct == PRODUCT) {
state->found = dev;
break;
}
}
if (!state->found) {
printf("no devices found\n");
goto error2;
}
ret = libusb_open(state->found, &state->handle);
if (ret) {
printf("cannot open device: %s\n", libusb_error_name(ret));
goto error2;
}
if (libusb_claim_interface(state->handle, 0)) {
ret = libusb_detach_kernel_driver(state->handle, 0);
if (ret) {
printf("unable to detach kernel driver: %s\n",
libusb_error_name(ret));
goto error3;
}
state->attached = 1;
ret = libusb_claim_interface(state->handle, 0);
if (ret) {
printf("cannot claim interface: %s\n",
libusb_error_name(ret));
goto error4;
}
}
return 0;
error4:
if (state->attached == 1)
libusb_attach_kernel_driver(state->handle, 0);
error3:
libusb_close(state->handle);
error2:
libusb_free_device_list(list, 1);
error1:
libusb_exit(state->ctx);
return 1;
}
/*
* test_exit - cleanup test program
*/
void test_exit(struct test_state *state)
{
libusb_release_interface(state->handle, 0);
if (state->attached == 1)
libusb_attach_kernel_driver(state->handle, 0);
libusb_close(state->handle);
libusb_exit(state->ctx);
}
int main(void)
{
struct test_state state;
if (test_init(&state))
return 1;
while (1) {
static unsigned char buffer[BUF_LEN];
int bytes;
libusb_bulk_transfer(state.handle, EP_BULK_IN, buffer, BUF_LEN,
&bytes, 500);
}
test_exit(&state);
}
|
