libusbgx: examples: Add UAC2 function example

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>

3 files changed, 119 insertions, 1 deletions

diff --git a/examples/Makefile.am b/examples/Makefile.am
index 52bbc27..9934321 100644
--- a/examples/Makefile.am
+++ b/examples/Makefile.am
@@ -1,4 +1,4 @@
-bin_PROGRAMS = show-gadgets gadget-acm-ecm gadget-vid-pid-remove gadget-ffs gadget-export gadget-import show-udcs gadget-ms gadget-midi gadget-hid gadget-rndis-os-desc
+bin_PROGRAMS = show-gadgets gadget-acm-ecm gadget-vid-pid-remove gadget-ffs gadget-export gadget-import show-udcs gadget-ms gadget-midi gadget-hid gadget-rndis-os-desc gadget-uac2
 gadget_acm_ecm_SOURCES = gadget-acm-ecm.c
 show_gadgets_SOURCES = show-gadgets.c
 gadget_vid_pid_remove_SOURCES = gadget-vid-pid-remove.c
diff --git a/examples/gadget-uac2.c b/examples/gadget-uac2.c
new file mode 100644
index 0000000..22f1802
--- /dev/null
+++ b/examples/gadget-uac2.c
@@ -0,0 +1,117 @@
+/*
+ * Copyright (C) 2018 Metanate Ltd
+ *
+ * John Keeping <john@metanate.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 <stdio.h>
+#include <linux/usb/ch9.h>
+#include <usbg/usbg.h>
+#include <usbg/function/uac2.h>
+
+#define VENDOR          0x1d6b
+#define PRODUCT         0x0104
+
+int main() {
+	usbg_state *s;
+	usbg_gadget *g;
+	usbg_config *c;
+	usbg_function *f_uac2;
+	int ret = -EINVAL;
+	int usbg_ret;
+
+	struct usbg_gadget_attrs g_attrs = {
+		.bcdUSB = 0x0200,
+		.bDeviceClass =	USB_CLASS_PER_INTERFACE,
+		.bDeviceSubClass = 0x00,
+		.bDeviceProtocol = 0x00,
+		.bMaxPacketSize0 = 64, /* Max allowed ep0 packet size */
+		.idVendor = VENDOR,
+		.idProduct = PRODUCT,
+		.bcdDevice = 0x0001, /* Verson of device */
+	};
+
+	struct usbg_gadget_strs g_strs = {
+		.serial = "0123456789", /* Serial number */
+		.manufacturer = "Foo Inc.", /* Manufacturer */
+		.product = "Bar Gadget" /* Product string */
+	};
+
+	struct usbg_config_strs c_strs = {
+		.configuration = "1xUAC2"
+	};
+
+	struct usbg_f_uac2_attrs f_attrs = {
+		.c_chmask = 3,
+		.c_srate = 44100,
+		.c_ssize = 4,
+		.p_chmask = 3,
+		.p_srate = 44100,
+		.p_ssize = 4,
+	};
+
+	usbg_ret = usbg_init("/sys/kernel/config", &s);
+	if (usbg_ret != USBG_SUCCESS) {
+		fprintf(stderr, "Error on usbg init\n");
+		fprintf(stderr, "Error: %s : %s\n", usbg_error_name(usbg_ret),
+				usbg_strerror(usbg_ret));
+		goto out1;
+	}
+
+	usbg_ret = usbg_create_gadget(s, "g1", &g_attrs, &g_strs, &g);
+	if (usbg_ret != USBG_SUCCESS) {
+		fprintf(stderr, "Error creating gadget\n");
+		fprintf(stderr, "Error: %s : %s\n", usbg_error_name(usbg_ret),
+				usbg_strerror(usbg_ret));
+		goto out2;
+	}
+	usbg_ret = usbg_create_function(g, USBG_F_UAC2, "usb0", &f_attrs, &f_uac2);
+	if (usbg_ret != USBG_SUCCESS) {
+		fprintf(stderr, "Error creating function\n");
+		fprintf(stderr, "Error: %s : %s\n", usbg_error_name(usbg_ret),
+				usbg_strerror(usbg_ret));
+		goto out2;
+	}
+
+	usbg_ret = usbg_create_config(g, 1, "The only one", NULL, &c_strs, &c);
+	if (usbg_ret != USBG_SUCCESS) {
+		fprintf(stderr, "Error creating config\n");
+		fprintf(stderr, "Error: %s : %s\n", usbg_error_name(usbg_ret),
+				usbg_strerror(usbg_ret));
+		goto out2;
+	}
+
+	usbg_ret = usbg_add_config_function(c, "some_name", f_uac2);
+	if (usbg_ret != USBG_SUCCESS) {
+		fprintf(stderr, "Error adding function\n");
+		fprintf(stderr, "Error: %s : %s\n", usbg_error_name(usbg_ret),
+				usbg_strerror(usbg_ret));
+		goto out2;
+	}
+
+	usbg_ret = usbg_enable_gadget(g, DEFAULT_UDC);
+	if (usbg_ret != USBG_SUCCESS) {
+		fprintf(stderr, "Error enabling gadget\n");
+		fprintf(stderr, "Error: %s : %s\n", usbg_error_name(usbg_ret),
+				usbg_strerror(usbg_ret));
+		goto out2;
+	}
+
+	ret = 0;
+out2:
+	usbg_cleanup(s);
+
+out1:
+	return ret;
+}
diff --git a/packaging/libusbgx.spec b/packaging/libusbgx.spec
index 84c878e..02e503a 100644
--- a/packaging/libusbgx.spec
+++ b/packaging/libusbgx.spec
@@ -79,6 +79,7 @@ make
 %{_bindir}/gadget-hid
 %{_bindir}/gadget-export
 %{_bindir}/gadget-import
+%{_bindir}/gadget-uac2
 %{_bindir}/show-udcs
 %{_bindir}/gadget-rndis-os-desc