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
186
187
188
189
190
191
192
|
/*
* 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 software is distributed under the terms of the GNU General Public
* License ("GPL") version 2, as published by the Free Software Foundation.
*
* 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/slab.h>
#include <linux/utsname.h>
#include <linux/module.h>
#include <linux/device.h>
#include <sound/core.h>
#include <sound/initval.h>
#include <sound/rawmidi.h>
#include <linux/usb/ch9.h>
#include <linux/usb/gadget.h>
#include <linux/usb/audio.h>
#include <linux/usb/midi.h>
#include "gadget_chips.h"
#include "composite.c"
#include "f_midi.c"
/*-------------------------------------------------------------------------*/
MODULE_AUTHOR("Ben Williamson");
MODULE_LICENSE("GPL v2");
static const char shortname[] = "g_midi";
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 = 256;
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 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 = __constant_cpu_to_le16(0x0200),
.bDeviceClass = USB_CLASS_PER_INTERFACE,
.idVendor = __constant_cpu_to_le16(DRIVER_VENDOR_NUM),
.idProduct = __constant_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 int __exit midi_unbind(struct usb_composite_dev *dev)
{
return 0;
}
static struct usb_configuration midi_config = {
.label = "MIDI Gadget",
.bConfigurationValue = 1,
/* .iConfiguration = DYNAMIC */
.bmAttributes = USB_CONFIG_ATT_ONE,
.bMaxPower = CONFIG_USB_GADGET_VBUS_DRAW / 2,
};
static int __init midi_bind_config(struct usb_configuration *c)
{
return f_midi_bind_config(c, index, id,
in_ports, out_ports,
buflen, qlen);
}
static int __init midi_bind(struct usb_composite_dev *cdev)
{
struct usb_gadget *gadget = cdev->gadget;
int gcnum, status;
status = usb_string_ids_tab(cdev, strings_dev);
if (status < 0)
return status;
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;
gcnum = usb_gadget_controller_number(gadget);
if (gcnum < 0) {
/* gmidi is so simple (no altsettings) that
* it SHOULD NOT have problems with bulk-capable hardware.
* so warn about unrecognized controllers, don't panic.
*/
pr_warning("%s: controller '%s' not recognized\n",
__func__, gadget->name);
device_desc.bcdDevice = cpu_to_le16(0x9999);
} else {
device_desc.bcdDevice = cpu_to_le16(0x0200 + gcnum);
}
status = usb_add_config(cdev, &midi_config, midi_bind_config);
if (status < 0)
return status;
usb_composite_overwrite_options(cdev, &coverwrite);
pr_info("%s\n", longname);
return 0;
}
static __refdata struct usb_composite_driver midi_driver = {
.name = (char *) longname,
.dev = &device_desc,
.strings = dev_strings,
.max_speed = USB_SPEED_HIGH,
.bind = midi_bind,
.unbind = __exit_p(midi_unbind),
};
static int __init midi_init(void)
{
return usb_composite_probe(&midi_driver);
}
module_init(midi_init);
static void __exit midi_cleanup(void)
{
usb_composite_unregister(&midi_driver);
}
module_exit(midi_cleanup);
|
