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https://github.com/linux-usb-gadgets/libusbgx.git
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54cb10a795
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>
81 lines
2 KiB
C
81 lines
2 KiB
C
/*
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* Copyright (C) 2014 Samsung Electronics
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*
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* Krzysztof Opasiak <k.opasiak@samsung.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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/**
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* @file gadget-export.c
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* @example gadget-export.c
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* This is an example of how to export a gadget to file.
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* Common reason of doing this is to share schema of gadget
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* between different devices or preserve gadget between reboots.
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*/
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#include <errno.h>
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#include <string.h>
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#include <stdio.h>
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#include <usbg/usbg.h>
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int main(int argc, char **argv)
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{
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usbg_state *s;
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usbg_gadget *g;
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int ret = -EINVAL;
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int usbg_ret;
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FILE *output;
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if (argc != 3) {
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fprintf(stderr, "Usage: gadget-export gadget_name file_name\n");
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return ret;
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}
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/* Prepare output file */
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output = fopen(argv[2], "w");
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if (!output) {
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fprintf(stderr, "Error on fopen. Error: %s\n", strerror(errno));
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goto out1;
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}
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/* Do gadget exporting */
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usbg_ret = usbg_init("/sys/kernel/config", &s);
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if (usbg_ret != USBG_SUCCESS) {
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fprintf(stderr, "Error on USB gadget init\n");
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fprintf(stderr, "Error: %s : %s\n", usbg_error_name(usbg_ret),
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usbg_strerror(usbg_ret));
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goto out2;
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}
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g = usbg_get_gadget(s, argv[1]);
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if (!g) {
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fprintf(stderr, "Error on get gadget\n");
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goto out3;
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}
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usbg_ret = usbg_export_gadget(g, output);
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if (usbg_ret != USBG_SUCCESS) {
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fprintf(stderr, "Error on export gadget\n");
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fprintf(stderr, "Error: %s : %s\n", usbg_error_name(usbg_ret),
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usbg_strerror(usbg_ret));
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goto out3;
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}
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ret = 0;
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out3:
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usbg_cleanup(s);
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out2:
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fclose(output);
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out1:
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return ret;
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}
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