1 /*
2 * This is free and unencumbered software released into the public domain.
3 *
4 * Anyone is free to copy, modify, publish, use, compile, sell, or
5 * distribute this software, either in source code form or as a compiled
6 * binary, for any purpose, commercial or non-commercial, and by any
7 * means.
8 *
9 * In jurisdictions that recognize copyright laws, the author or authors
10 * of this software dedicate any and all copyright interest in the
11 * software to the public domain. We make this dedication for the benefit
12 * of the public at large and to the detriment of our heirs and
13 * successors. We intend this dedication to be an overt act of
14 * relinquishment in perpetuity of all present and future rights to this
15 * software under copyright law.
16 *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
18 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
19 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
20 * IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
21 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
22 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
23 * OTHER DEALINGS IN THE SOFTWARE.
24 *
25 * For more information, please refer to <http://unlicense.org/>
26 */
27
28 #include <libusb.h>
29 #include <stdio.h>
30 #include <string.h>
31 #include <unistd.h>
32
33 #define VENDOR 0x1d6b
34 #define PRODUCT 0x0105
35
36 #define BUF_LEN 8192
37
38 /*
39 * struct test_state - describes test program state
40 * @list: list of devices returned by libusb_get_device_list function
41 * @found: pointer to struct describing tested device
42 * @ctx: context, set to NULL
43 * @handle: handle of tested device
44 * @attached: indicates that device was attached to kernel, and has to be
45 * reattached at the end of test program
46 */
47
48 struct test_state {
49 libusb_device *found;
50 libusb_context *ctx;
51 libusb_device_handle *handle;
52 int attached;
53 };
54
55 /*
56 * test_init - initialize test program
57 */
58
59 int test_init(struct test_state *state)
60 {
61 int i, ret;
62 ssize_t cnt;
63 libusb_device **list;
64
65 state->found = NULL;
66 state->ctx = NULL;
67 state->handle = NULL;
68 state->attached = 0;
69
70 ret = libusb_init(&state->ctx);
71 if (ret) {
72 printf("cannot init libusb: %s\n", libusb_error_name(ret));
73 return 1;
74 }
75
76 cnt = libusb_get_device_list(state->ctx, &list);
77 if (cnt <= 0) {
78 printf("no devices found\n");
79 goto error1;
80 }
81
82 for (i = 0; i < cnt; ++i) {
83 libusb_device *dev = list[i];
84 struct libusb_device_descriptor desc;
85 ret = libusb_get_device_descriptor(dev, &desc);
86 if (ret) {
87 printf("unable to get device descriptor: %s\n",
88 libusb_error_name(ret));
89 goto error2;
90 }
91 if (desc.idVendor == VENDOR && desc.idProduct == PRODUCT) {
92 state->found = dev;
93 break;
94 }
95 }
96
97 if (!state->found) {
98 printf("no devices found\n");
99 goto error2;
100 }
101
102 ret = libusb_open(state->found, &state->handle);
103 if (ret) {
104 printf("cannot open device: %s\n", libusb_error_name(ret));
105 goto error2;
106 }
107
108 if (libusb_claim_interface(state->handle, 0)) {
109 ret = libusb_detach_kernel_driver(state->handle, 0);
110 if (ret) {
111 printf("unable to detach kernel driver: %s\n",
112 libusb_error_name(ret));
113 goto error3;
114 }
115 state->attached = 1;
116 ret = libusb_claim_interface(state->handle, 0);
117 if (ret) {
118 printf("cannot claim interface: %s\n",
119 libusb_error_name(ret));
120 goto error4;
121 }
122 }
123
124 return 0;
125
126 error4:
127 if (state->attached == 1)
128 libusb_attach_kernel_driver(state->handle, 0);
129
130 error3:
131 libusb_close(state->handle);
132
133 error2:
134 libusb_free_device_list(list, 1);
135
136 error1:
137 libusb_exit(state->ctx);
138 return 1;
139 }
140
141 /*
142 * test_exit - cleanup test program
143 */
144
145 void test_exit(struct test_state *state)
146 {
147 libusb_release_interface(state->handle, 0);
148 if (state->attached == 1)
149 libusb_attach_kernel_driver(state->handle, 0);
150 libusb_close(state->handle);
151 libusb_exit(state->ctx);
152 }
153
154 int main(void)
155 {
156 struct test_state state;
157 struct libusb_config_descriptor *conf;
158 struct libusb_interface_descriptor const *iface;
159 unsigned char addr;
160
161 if (test_init(&state))
162 return 1;
163
164 libusb_get_config_descriptor(state.found, 0, &conf);
165 iface = &conf->interface[0].altsetting[0];
166 addr = iface->endpoint[0].bEndpointAddress;
167
168 while (1) {
169 static unsigned char buffer[BUF_LEN];
170 int bytes;
171 libusb_bulk_transfer(state.handle, addr, buffer, BUF_LEN,
172 &bytes, 500);
173 }
174 test_exit(&state);
175 }