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https://github.com/linux-usb-gadgets/libusbgx.git
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88cff3cbf7
Show how to create a USB Audio Class 2 gadget. Signed-off-by: John Keeping <john@metanate.com> Signed-off-by: Krzysztof Opasiak <k.opasiak@samsung.com>
117 lines
3.1 KiB
C
117 lines
3.1 KiB
C
/*
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* Copyright (C) 2018 Metanate Ltd
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*
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* John Keeping <john@metanate.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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#include <errno.h>
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#include <stdio.h>
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#include <linux/usb/ch9.h>
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#include <usbg/usbg.h>
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#include <usbg/function/uac2.h>
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#define VENDOR 0x1d6b
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#define PRODUCT 0x0104
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int main() {
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usbg_state *s;
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usbg_gadget *g;
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usbg_config *c;
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usbg_function *f_uac2;
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int ret = -EINVAL;
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int usbg_ret;
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struct usbg_gadget_attrs g_attrs = {
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.bcdUSB = 0x0200,
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.bDeviceClass = USB_CLASS_PER_INTERFACE,
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.bDeviceSubClass = 0x00,
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.bDeviceProtocol = 0x00,
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.bMaxPacketSize0 = 64, /* Max allowed ep0 packet size */
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.idVendor = VENDOR,
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.idProduct = PRODUCT,
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.bcdDevice = 0x0001, /* Verson of device */
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};
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struct usbg_gadget_strs g_strs = {
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.serial = "0123456789", /* Serial number */
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.manufacturer = "Foo Inc.", /* Manufacturer */
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.product = "Bar Gadget" /* Product string */
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};
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struct usbg_config_strs c_strs = {
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.configuration = "1xUAC2"
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};
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struct usbg_f_uac2_attrs f_attrs = {
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.c_chmask = 3,
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.c_srate = 44100,
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.c_ssize = 4,
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.p_chmask = 3,
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.p_srate = 44100,
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.p_ssize = 4,
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};
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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 usbg 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 out1;
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}
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usbg_ret = usbg_create_gadget(s, "g1", &g_attrs, &g_strs, &g);
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if (usbg_ret != USBG_SUCCESS) {
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fprintf(stderr, "Error creating 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 out2;
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}
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usbg_ret = usbg_create_function(g, USBG_F_UAC2, "usb0", &f_attrs, &f_uac2);
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if (usbg_ret != USBG_SUCCESS) {
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fprintf(stderr, "Error creating function\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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usbg_ret = usbg_create_config(g, 1, "The only one", NULL, &c_strs, &c);
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if (usbg_ret != USBG_SUCCESS) {
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fprintf(stderr, "Error creating config\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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usbg_ret = usbg_add_config_function(c, "some_name", f_uac2);
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if (usbg_ret != USBG_SUCCESS) {
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fprintf(stderr, "Error adding function\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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usbg_ret = usbg_enable_gadget(g, DEFAULT_UDC);
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if (usbg_ret != USBG_SUCCESS) {
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fprintf(stderr, "Error enabling 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 out2;
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}
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ret = 0;
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out2:
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usbg_cleanup(s);
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out1:
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return ret;
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}
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