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
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
|
/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Line 6 Linux USB driver
*
* Copyright (C) 2004-2010 Markus Grabner (grabner@icg.tugraz.at)
*/
#ifndef DRIVER_H
#define DRIVER_H
#include <linux/usb.h>
#include <linux/mutex.h>
#include <linux/kfifo.h>
#include <sound/core.h>
#include "midi.h"
/* USB 1.1 speed configuration */
#define USB_LOW_INTERVALS_PER_SECOND 1000
#define USB_LOW_ISO_BUFFERS 2
/* USB 2.0+ speed configuration */
#define USB_HIGH_INTERVALS_PER_SECOND 8000
#define USB_HIGH_ISO_BUFFERS 16
/* Fallback USB interval and max packet size values */
#define LINE6_FALLBACK_INTERVAL 10
#define LINE6_FALLBACK_MAXPACKETSIZE 16
#define LINE6_TIMEOUT 1000
#define LINE6_BUFSIZE_LISTEN 64
#define LINE6_MIDI_MESSAGE_MAXLEN 256
#define LINE6_RAW_MESSAGES_MAXCOUNT_ORDER 7
/* 4k packets are common, BUFSIZE * MAXCOUNT should be bigger... */
#define LINE6_RAW_MESSAGES_MAXCOUNT (1 << LINE6_RAW_MESSAGES_MAXCOUNT_ORDER)
#if LINE6_BUFSIZE_LISTEN > 65535
#error "Use dynamic fifo instead"
#endif
/*
Line 6 MIDI control commands
*/
#define LINE6_PARAM_CHANGE 0xb0
#define LINE6_PROGRAM_CHANGE 0xc0
#define LINE6_SYSEX_BEGIN 0xf0
#define LINE6_SYSEX_END 0xf7
#define LINE6_RESET 0xff
/*
MIDI channel for messages initiated by the host
(and eventually echoed back by the device)
*/
#define LINE6_CHANNEL_HOST 0x00
/*
MIDI channel for messages initiated by the device
*/
#define LINE6_CHANNEL_DEVICE 0x02
#define LINE6_CHANNEL_UNKNOWN 5 /* don't know yet what this is good for */
#define LINE6_CHANNEL_MASK 0x0f
extern const unsigned char line6_midi_id[3];
#define SYSEX_DATA_OFS (sizeof(line6_midi_id) + 3)
#define SYSEX_EXTRA_SIZE (sizeof(line6_midi_id) + 4)
/*
Common properties of Line 6 devices.
*/
struct line6_properties {
/* Card id string (maximum 16 characters).
* This can be used to address the device in ALSA programs as
* "default:CARD=<id>"
*/
const char *id;
/* Card short name (maximum 32 characters) */
const char *name;
/* Bit vector defining this device's capabilities in line6usb driver */
int capabilities;
int altsetting;
unsigned int ctrl_if;
unsigned int ep_ctrl_r;
unsigned int ep_ctrl_w;
unsigned int ep_audio_r;
unsigned int ep_audio_w;
};
/* Capability bits */
enum {
/* device supports settings parameter via USB */
LINE6_CAP_CONTROL = 1 << 0,
/* device supports PCM input/output via USB */
LINE6_CAP_PCM = 1 << 1,
/* device supports hardware monitoring */
LINE6_CAP_HWMON = 1 << 2,
/* device requires output data when input is read */
LINE6_CAP_IN_NEEDS_OUT = 1 << 3,
/* device uses raw MIDI via USB (data endpoints) */
LINE6_CAP_CONTROL_MIDI = 1 << 4,
/* device provides low-level information */
LINE6_CAP_CONTROL_INFO = 1 << 5,
/* device provides hardware monitoring volume control */
LINE6_CAP_HWMON_CTL = 1 << 6,
};
/*
Common data shared by all Line 6 devices.
Corresponds to a pair of USB endpoints.
*/
struct usb_line6 {
/* USB device */
struct usb_device *usbdev;
/* Properties */
const struct line6_properties *properties;
/* Interval for data USB packets */
int interval;
/* ...for isochronous transfers framing */
int intervals_per_second;
/* Number of isochronous URBs used for frame transfers */
int iso_buffers;
/* Maximum size of data USB packet */
int max_packet_size;
/* Device representing the USB interface */
struct device *ifcdev;
/* Line 6 sound card data structure.
* Each device has at least MIDI or PCM.
*/
struct snd_card *card;
/* Line 6 PCM device data structure */
struct snd_line6_pcm *line6pcm;
/* Line 6 MIDI device data structure */
struct snd_line6_midi *line6midi;
/* URB for listening to POD data endpoint */
struct urb *urb_listen;
/* Buffer for incoming data from POD data endpoint */
unsigned char *buffer_listen;
/* Buffer for message to be processed, generated from MIDI layer */
unsigned char *buffer_message;
/* Length of message to be processed, generated from MIDI layer */
int message_length;
/* Circular buffer for non-MIDI control messages */
struct {
struct mutex read_lock;
wait_queue_head_t wait_queue;
unsigned int active:1;
unsigned int nonblock:1;
STRUCT_KFIFO_REC_2(LINE6_BUFSIZE_LISTEN * LINE6_RAW_MESSAGES_MAXCOUNT)
fifo;
} messages;
/* Work for delayed PCM startup */
struct delayed_work startup_work;
/* If MIDI is supported, buffer_message contains the pre-processed data;
* otherwise the data is only in urb_listen (buffer_incoming).
*/
void (*process_message)(struct usb_line6 *);
void (*disconnect)(struct usb_line6 *line6);
void (*startup)(struct usb_line6 *line6);
};
extern char *line6_alloc_sysex_buffer(struct usb_line6 *line6, int code1,
int code2, int size);
extern int line6_read_data(struct usb_line6 *line6, unsigned address,
void *data, unsigned datalen);
extern int line6_read_serial_number(struct usb_line6 *line6,
u32 *serial_number);
extern int line6_send_raw_message(struct usb_line6 *line6,
const char *buffer, int size);
extern int line6_send_raw_message_async(struct usb_line6 *line6,
const char *buffer, int size);
extern int line6_send_sysex_message(struct usb_line6 *line6,
const char *buffer, int size);
extern int line6_version_request_async(struct usb_line6 *line6);
extern int line6_write_data(struct usb_line6 *line6, unsigned address,
void *data, unsigned datalen);
int line6_probe(struct usb_interface *interface,
const struct usb_device_id *id,
const char *driver_name,
const struct line6_properties *properties,
int (*private_init)(struct usb_line6 *, const struct usb_device_id *id),
size_t data_size);
void line6_disconnect(struct usb_interface *interface);
#ifdef CONFIG_PM
int line6_suspend(struct usb_interface *interface, pm_message_t message);
int line6_resume(struct usb_interface *interface);
#endif
#endif
|
