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libusbgx: examples: Add sample application to export gadget

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Add sample C code which shows how to use new functionality
of libusbg - gadget export. This program allows to export
chosen gadget from configfs to a file.

Signed-off-by: Krzysztof Opasiak <k.opasiak@samsung.com>
[Port from libusbg and update description]
Signed-off-by: Krzysztof Opasiak <k.opasiak@samsung.com>
This commit is contained in:
Krzysztof Opasiak 2014-07-05 12:48:18 +02:00
parent 2aa8f8ae62
commit 54cb10a795
2 changed files with 83 additions and 1 deletions
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3
examples/Makefile.am
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@ -1,7 +1,8 @@
bin_PROGRAMS = show-gadgets gadget-acm-ecm gadget-vid-pid-remove gadget-ffs
bin_PROGRAMS = show-gadgets gadget-acm-ecm gadget-vid-pid-remove gadget-ffs gadget-export
gadget_acm_ecm_SOURCES = gadget-acm-ecm.c
show_gadgets_SOURCES = show-gadgets.c
gadget_vid_pid_remove_SOURCES = gadget-vid-pid-remove.c
gadget_ffs_SOURCES = gadget-ffs.c
gadget_export_SOURCE = gadget-export.c
AM_CPPFLAGS=-I../include/
AM_LDFLAGS=-L../src/ -lusbgx

81
examples/gadget-export.c Normal file
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@ -0,0 +1,81 @@
/*
* 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.
*/
/**
* @file gadget-export.c
* @example 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.
*/
#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;
}