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