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/*
* This is free and unencumbered software released into the public domain.
*
* Anyone is free to copy, modify, publish, use, compile, sell, or
* distribute this software, either in source code form or as a compiled
* binary, for any purpose, commercial or non-commercial, and by any
* means.
*
* In jurisdictions that recognize copyright laws, the author or authors
* of this software dedicate any and all copyright interest in the
* software to the public domain. We make this dedication for the benefit
* of the public at large and to the detriment of our heirs and
* successors. We intend this dedication to be an overt act of
* relinquishment in perpetuity of all present and future rights to this
* software under copyright law.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*
* For more information, please refer to <http://unlicense.org/>
*/
#include <libusb.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#define VENDOR 0x1d6b
#define PRODUCT 0x0105
#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;
struct libusb_config_descriptor *conf;
struct libusb_interface_descriptor const *iface;
unsigned char in_addr, out_addr;
if (test_init(&state))
return 1;
libusb_get_config_descriptor(state.found, 0, &conf);
iface = &conf->interface[0].altsetting[0];
in_addr = iface->endpoint[0].bEndpointAddress;
out_addr = iface->endpoint[1].bEndpointAddress;
while (1) {
static unsigned char buffer[BUF_LEN];
int bytes;
libusb_bulk_transfer(state.handle, in_addr, buffer, BUF_LEN,
&bytes, 500);
libusb_bulk_transfer(state.handle, out_addr, buffer, BUF_LEN,
&bytes, 500);
}
test_exit(&state);
}
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