Loading...
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 | // 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); |