tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * gmidi.c -- USB MIDI Gadget Driver
3 *
4 * Copyright (C) 2006 Thumtronics Pty Ltd.
5 * Developed for Thumtronics by Grey Innovation
6 * Ben Williamson <ben.williamson@greyinnovation.com>
7 *
8 * This software is distributed under the terms of the GNU General Public
9 * License ("GPL") version 2, as published by the Free Software Foundation.
10 *
11 * This code is based in part on:
12 *
13 * Gadget Zero driver, Copyright (C) 2003-2004 David Brownell.
14 * USB Audio driver, Copyright (C) 2002 by Takashi Iwai.
15 * USB MIDI driver, Copyright (C) 2002-2005 Clemens Ladisch.
16 *
17 * Refer to the USB Device Class Definition for MIDI Devices:
18 * http://www.usb.org/developers/devclass_docs/midi10.pdf
19 */
20
21/* #define VERBOSE_DEBUG */
22
23#include <linux/kernel.h>
24#include <linux/slab.h>
25#include <linux/module.h>
26#include <linux/device.h>
27
28#include <sound/core.h>
29#include <sound/initval.h>
30#include <sound/rawmidi.h>
31
32#include <linux/usb/ch9.h>
33#include <linux/usb/composite.h>
34#include <linux/usb/gadget.h>
35#include <linux/usb/audio.h>
36#include <linux/usb/midi.h>
37
38#include "gadget_chips.h"
39
40#include "f_midi.c"
41
42/*-------------------------------------------------------------------------*/
43
44MODULE_AUTHOR("Ben Williamson");
45MODULE_LICENSE("GPL v2");
46
47static const char shortname[] = "g_midi";
48static const char longname[] = "MIDI Gadget";
49
50USB_GADGET_COMPOSITE_OPTIONS();
51
52static int index = SNDRV_DEFAULT_IDX1;
53module_param(index, int, S_IRUGO);
54MODULE_PARM_DESC(index, "Index value for the USB MIDI Gadget adapter.");
55
56static char *id = SNDRV_DEFAULT_STR1;
57module_param(id, charp, S_IRUGO);
58MODULE_PARM_DESC(id, "ID string for the USB MIDI Gadget adapter.");
59
60static unsigned int buflen = 256;
61module_param(buflen, uint, S_IRUGO);
62MODULE_PARM_DESC(buflen, "MIDI buffer length");
63
64static unsigned int qlen = 32;
65module_param(qlen, uint, S_IRUGO);
66MODULE_PARM_DESC(qlen, "USB read request queue length");
67
68static unsigned int in_ports = 1;
69module_param(in_ports, uint, S_IRUGO);
70MODULE_PARM_DESC(in_ports, "Number of MIDI input ports");
71
72static unsigned int out_ports = 1;
73module_param(out_ports, uint, S_IRUGO);
74MODULE_PARM_DESC(out_ports, "Number of MIDI output ports");
75
76/* Thanks to Grey Innovation for donating this product ID.
77 *
78 * DO NOT REUSE THESE IDs with a protocol-incompatible driver!! Ever!!
79 * Instead: allocate your own, using normal USB-IF procedures.
80 */
81#define DRIVER_VENDOR_NUM 0x17b3 /* Grey Innovation */
82#define DRIVER_PRODUCT_NUM 0x0004 /* Linux-USB "MIDI Gadget" */
83
84/* string IDs are assigned dynamically */
85
86#define STRING_DESCRIPTION_IDX USB_GADGET_FIRST_AVAIL_IDX
87
88static struct usb_device_descriptor device_desc = {
89 .bLength = USB_DT_DEVICE_SIZE,
90 .bDescriptorType = USB_DT_DEVICE,
91 .bcdUSB = __constant_cpu_to_le16(0x0200),
92 .bDeviceClass = USB_CLASS_PER_INTERFACE,
93 .idVendor = __constant_cpu_to_le16(DRIVER_VENDOR_NUM),
94 .idProduct = __constant_cpu_to_le16(DRIVER_PRODUCT_NUM),
95 /* .iManufacturer = DYNAMIC */
96 /* .iProduct = DYNAMIC */
97 .bNumConfigurations = 1,
98};
99
100static struct usb_string strings_dev[] = {
101 [USB_GADGET_MANUFACTURER_IDX].s = "Grey Innovation",
102 [USB_GADGET_PRODUCT_IDX].s = "MIDI Gadget",
103 [USB_GADGET_SERIAL_IDX].s = "",
104 [STRING_DESCRIPTION_IDX].s = "MIDI",
105 { } /* end of list */
106};
107
108static struct usb_gadget_strings stringtab_dev = {
109 .language = 0x0409, /* en-us */
110 .strings = strings_dev,
111};
112
113static struct usb_gadget_strings *dev_strings[] = {
114 &stringtab_dev,
115 NULL,
116};
117
118static int __exit midi_unbind(struct usb_composite_dev *dev)
119{
120 return 0;
121}
122
123static struct usb_configuration midi_config = {
124 .label = "MIDI Gadget",
125 .bConfigurationValue = 1,
126 /* .iConfiguration = DYNAMIC */
127 .bmAttributes = USB_CONFIG_ATT_ONE,
128 .MaxPower = CONFIG_USB_GADGET_VBUS_DRAW,
129};
130
131static int __init midi_bind_config(struct usb_configuration *c)
132{
133 return f_midi_bind_config(c, index, id,
134 in_ports, out_ports,
135 buflen, qlen);
136}
137
138static int __init midi_bind(struct usb_composite_dev *cdev)
139{
140 int status;
141
142 status = usb_string_ids_tab(cdev, strings_dev);
143 if (status < 0)
144 return status;
145 device_desc.iManufacturer = strings_dev[USB_GADGET_MANUFACTURER_IDX].id;
146 device_desc.iProduct = strings_dev[USB_GADGET_PRODUCT_IDX].id;
147 midi_config.iConfiguration = strings_dev[STRING_DESCRIPTION_IDX].id;
148
149 status = usb_add_config(cdev, &midi_config, midi_bind_config);
150 if (status < 0)
151 return status;
152 usb_composite_overwrite_options(cdev, &coverwrite);
153 pr_info("%s\n", longname);
154 return 0;
155}
156
157static __refdata struct usb_composite_driver midi_driver = {
158 .name = (char *) longname,
159 .dev = &device_desc,
160 .strings = dev_strings,
161 .max_speed = USB_SPEED_HIGH,
162 .bind = midi_bind,
163 .unbind = __exit_p(midi_unbind),
164};
165
166static int __init midi_init(void)
167{
168 return usb_composite_probe(&midi_driver);
169}
170module_init(midi_init);
171
172static void __exit midi_cleanup(void)
173{
174 usb_composite_unregister(&midi_driver);
175}
176module_exit(midi_cleanup);
177