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gadget-export.c

This is an example of how to export a gadget to file. Common reason of doing this is to share schema of gadget between different devices or preserve gadget between reboots.

/*
* Copyright (C) 2014 Samsung Electronics
*
* Krzysztof Opasiak <k.opasiak@samsung.com>
*
* This program 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.
*
* This program 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.
*/
#include <errno.h>
#include <string.h>
#include <stdio.h>
#include <usbg/usbg.h>
int main(int argc, char **argv)
{
usbg_state *s;
usbg_gadget *g;
int ret = -EINVAL;
int usbg_ret;
FILE *output;
if (argc != 3) {
fprintf(stderr, "Usage: gadget-export gadget_name file_name\n");
return ret;
}
/* Prepare output file */
output = fopen(argv[2], "w");
if (!output) {
fprintf(stderr, "Error on fopen. Error: %s\n", strerror(errno));
goto out1;
}
/* Do gadget exporting */
usbg_ret = usbg_init("/sys/kernel/config", &s);
if (usbg_ret != USBG_SUCCESS) {
fprintf(stderr, "Error on USB gadget init\n");
fprintf(stderr, "Error: %s : %s\n", usbg_error_name(usbg_ret),
usbg_strerror(usbg_ret));
goto out2;
}
g = usbg_get_gadget(s, argv[1]);
if (!g) {
fprintf(stderr, "Error on get gadget\n");
goto out3;
}
usbg_ret = usbg_export_gadget(g, output);
if (usbg_ret != USBG_SUCCESS) {
fprintf(stderr, "Error on export gadget\n");
fprintf(stderr, "Error: %s : %s\n", usbg_error_name(usbg_ret),
usbg_strerror(usbg_ret));
goto out3;
}
ret = 0;
out3:
usbg_cleanup(s);
out2:
fclose(output);
out1:
return ret;
}
usbg_strerror
const char * usbg_strerror(usbg_error e)
Get the short description of error.
Definition usbg_error.c:123
usbg_export_gadget
int usbg_export_gadget(usbg_gadget *g, FILE *stream)
Exports whole gadget to file.
Definition usbg_schemes_libconfig.c:776
usbg_get_gadget
usbg_gadget * usbg_get_gadget(usbg_state *s, const char *name)
Get a gadget device by name.
Definition usbg.c:1154
usbg_init
int usbg_init(const char *configfs_path, usbg_state **state)
Initialize the libusbgx library state.
Definition usbg.c:1091
usbg_cleanup
void usbg_cleanup(usbg_state *s)
Clean up the libusbgx library state.
Definition usbg.c:1136
usbg_error_name
const char * usbg_error_name(usbg_error e)
Get the error name as a constant string.
Definition usbg_error.c:62
usbg_gadget
Definition usbg_internal.h:103
usbg_state
Definition usbg_internal.h:93
usbg.h