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// 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);
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