libusbg: examples: add example of midi function usage

Support for midi function was recently added. This commit adds an example
program which shows how to create midi gadget with this function.

Signed-off-by: Pawel Szewczyk <p.szewczyk@samsung.com>
Reviewed-by: Krzysztof Opasiak <k.opasiak@samsung.com>

2 files changed, 119 insertions, 1 deletions

diff --git a/examples/Makefile.am b/examples/Makefile.am
index 3164256..36e0b9b 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
+bin_PROGRAMS = show-gadgets gadget-acm-ecm gadget-vid-pid-remove gadget-ffs gadget-export gadget-import show-udcs gadget-ms gadget-midi
 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-midi.c b/examples/gadget-midi.c
new file mode 100644
index 0000000..44699f3
--- /dev/null
+++ b/examples/gadget-midi.c
@@ -0,0 +1,118 @@
+/*
+ * Copyright (C) 2014 Samsung Electronics
+ *
+ * Pawel Szewczyk <p.szewczyk@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 <stdio.h>
+#include <usbg/usbg.h>
+
+#define VENDOR          0x1d6b
+#define PRODUCT         0x0104
+
+int main() {
+	usbg_state *s;
+	usbg_gadget *g;
+	usbg_config *c;
+	usbg_function *f_midi;
+	int ret = -EINVAL;
+	int usbg_ret;
+
+	usbg_gadget_attrs g_attrs = {
+			0x0200, /* bcdUSB */
+			0x00, /* Defined at interface level */
+			0x00, /* subclass */
+			0x00, /* device protocol */
+			0x0040, /* Max allowed packet size */
+			VENDOR,
+			PRODUCT,
+			0x0001, /* Verson of device */
+	};
+
+	usbg_gadget_strs g_strs = {
+			"0123456789", /* Serial number */
+			"Foo Inc.", /* Manufacturer */
+			"Bar Gadget" /* Product string */
+	};
+
+	usbg_config_strs c_strs = {
+			"1xMIDI"
+	};
+
+	usbg_function_attrs f_attrs = {
+		.header.attrs_type = USBG_F_ATTRS_MIDI,
+		.attrs.midi = {
+			.index = 0,
+			.id = "usb0",
+			.buflen = 128,
+			.qlen = 16,
+			.in_ports = 2,
+			.out_ports = 3,
+		},
+	};
+
+	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, F_MIDI, "usb0", &f_attrs, &f_midi);
+	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_midi);
+	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;
+}