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-rw-r--r--drivers/usb/gadget/legacy/gmidi.c185
1 files changed, 185 insertions, 0 deletions
diff --git a/drivers/usb/gadget/legacy/gmidi.c b/drivers/usb/gadget/legacy/gmidi.c
new file mode 100644
index 000000000..265c39281
--- /dev/null
+++ b/drivers/usb/gadget/legacy/gmidi.c
@@ -0,0 +1,185 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * gmidi.c -- USB MIDI Gadget Driver
+ *
+ * Copyright (C) 2006 Thumtronics Pty Ltd.
+ * Developed for Thumtronics by Grey Innovation
+ * Ben Williamson <ben.williamson@greyinnovation.com>
+ *
+ * This code is based in part on:
+ *
+ * Gadget Zero driver, Copyright (C) 2003-2004 David Brownell.
+ * USB Audio driver, Copyright (C) 2002 by Takashi Iwai.
+ * USB MIDI driver, Copyright (C) 2002-2005 Clemens Ladisch.
+ *
+ * Refer to the USB Device Class Definition for MIDI Devices:
+ * http://www.usb.org/developers/devclass_docs/midi10.pdf
+ */
+
+/* #define VERBOSE_DEBUG */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+
+#include <sound/initval.h>
+
+#include <linux/usb/composite.h>
+#include <linux/usb/gadget.h>
+
+#include "u_midi.h"
+
+/*-------------------------------------------------------------------------*/
+
+MODULE_AUTHOR("Ben Williamson");
+MODULE_LICENSE("GPL v2");
+
+static const char longname[] = "MIDI Gadget";
+
+USB_GADGET_COMPOSITE_OPTIONS();
+
+static int index = SNDRV_DEFAULT_IDX1;
+module_param(index, int, S_IRUGO);
+MODULE_PARM_DESC(index, "Index value for the USB MIDI Gadget adapter.");
+
+static char *id = SNDRV_DEFAULT_STR1;
+module_param(id, charp, S_IRUGO);
+MODULE_PARM_DESC(id, "ID string for the USB MIDI Gadget adapter.");
+
+static unsigned int buflen = 512;
+module_param(buflen, uint, S_IRUGO);
+MODULE_PARM_DESC(buflen, "MIDI buffer length");
+
+static unsigned int qlen = 32;
+module_param(qlen, uint, S_IRUGO);
+MODULE_PARM_DESC(qlen, "USB read and write request queue length");
+
+static unsigned int in_ports = 1;
+module_param(in_ports, uint, S_IRUGO);
+MODULE_PARM_DESC(in_ports, "Number of MIDI input ports");
+
+static unsigned int out_ports = 1;
+module_param(out_ports, uint, S_IRUGO);
+MODULE_PARM_DESC(out_ports, "Number of MIDI output ports");
+
+/* Thanks to Grey Innovation for donating this product ID.
+ *
+ * DO NOT REUSE THESE IDs with a protocol-incompatible driver!! Ever!!
+ * Instead: allocate your own, using normal USB-IF procedures.
+ */
+#define DRIVER_VENDOR_NUM 0x17b3 /* Grey Innovation */
+#define DRIVER_PRODUCT_NUM 0x0004 /* Linux-USB "MIDI Gadget" */
+
+/* string IDs are assigned dynamically */
+
+#define STRING_DESCRIPTION_IDX USB_GADGET_FIRST_AVAIL_IDX
+
+static struct usb_device_descriptor device_desc = {
+ .bLength = USB_DT_DEVICE_SIZE,
+ .bDescriptorType = USB_DT_DEVICE,
+ /* .bcdUSB = DYNAMIC */
+ .bDeviceClass = USB_CLASS_PER_INTERFACE,
+ .idVendor = cpu_to_le16(DRIVER_VENDOR_NUM),
+ .idProduct = cpu_to_le16(DRIVER_PRODUCT_NUM),
+ /* .iManufacturer = DYNAMIC */
+ /* .iProduct = DYNAMIC */
+ .bNumConfigurations = 1,
+};
+
+static struct usb_string strings_dev[] = {
+ [USB_GADGET_MANUFACTURER_IDX].s = "Grey Innovation",
+ [USB_GADGET_PRODUCT_IDX].s = "MIDI Gadget",
+ [USB_GADGET_SERIAL_IDX].s = "",
+ [STRING_DESCRIPTION_IDX].s = "MIDI",
+ { } /* end of list */
+};
+
+static struct usb_gadget_strings stringtab_dev = {
+ .language = 0x0409, /* en-us */
+ .strings = strings_dev,
+};
+
+static struct usb_gadget_strings *dev_strings[] = {
+ &stringtab_dev,
+ NULL,
+};
+
+static struct usb_function_instance *fi_midi;
+static struct usb_function *f_midi;
+
+static int midi_unbind(struct usb_composite_dev *dev)
+{
+ usb_put_function(f_midi);
+ usb_put_function_instance(fi_midi);
+ return 0;
+}
+
+static struct usb_configuration midi_config = {
+ .label = "MIDI Gadget",
+ .bConfigurationValue = 1,
+ /* .iConfiguration = DYNAMIC */
+ .bmAttributes = USB_CONFIG_ATT_ONE,
+ .MaxPower = CONFIG_USB_GADGET_VBUS_DRAW,
+};
+
+static int midi_bind_config(struct usb_configuration *c)
+{
+ int status;
+
+ f_midi = usb_get_function(fi_midi);
+ if (IS_ERR(f_midi))
+ return PTR_ERR(f_midi);
+
+ status = usb_add_function(c, f_midi);
+ if (status < 0) {
+ usb_put_function(f_midi);
+ return status;
+ }
+
+ return 0;
+}
+
+static int midi_bind(struct usb_composite_dev *cdev)
+{
+ struct f_midi_opts *midi_opts;
+ int status;
+
+ fi_midi = usb_get_function_instance("midi");
+ if (IS_ERR(fi_midi))
+ return PTR_ERR(fi_midi);
+
+ midi_opts = container_of(fi_midi, struct f_midi_opts, func_inst);
+ midi_opts->index = index;
+ midi_opts->id = id;
+ midi_opts->in_ports = in_ports;
+ midi_opts->out_ports = out_ports;
+ midi_opts->buflen = buflen;
+ midi_opts->qlen = qlen;
+
+ status = usb_string_ids_tab(cdev, strings_dev);
+ if (status < 0)
+ goto put;
+ device_desc.iManufacturer = strings_dev[USB_GADGET_MANUFACTURER_IDX].id;
+ device_desc.iProduct = strings_dev[USB_GADGET_PRODUCT_IDX].id;
+ midi_config.iConfiguration = strings_dev[STRING_DESCRIPTION_IDX].id;
+
+ status = usb_add_config(cdev, &midi_config, midi_bind_config);
+ if (status < 0)
+ goto put;
+ usb_composite_overwrite_options(cdev, &coverwrite);
+ pr_info("%s\n", longname);
+ return 0;
+put:
+ usb_put_function_instance(fi_midi);
+ return status;
+}
+
+static struct usb_composite_driver midi_driver = {
+ .name = longname,
+ .dev = &device_desc,
+ .strings = dev_strings,
+ .max_speed = USB_SPEED_HIGH,
+ .bind = midi_bind,
+ .unbind = midi_unbind,
+};
+
+module_usb_composite_driver(midi_driver);