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Markus Grabner705ecec2009-02-27 19:43:04 -08001/*
Chris Rorvickc078a4a2015-01-20 02:20:50 -06002 * Line 6 Linux USB driver
Markus Grabner705ecec2009-02-27 19:43:04 -08003 *
Markus Grabner1027f472010-08-12 01:35:30 +02004 * Copyright (C) 2004-2010 Markus Grabner (grabner@icg.tugraz.at)
Markus Grabner705ecec2009-02-27 19:43:04 -08005 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License as
8 * published by the Free Software Foundation, version 2.
9 *
10 */
11
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090012#include <linux/slab.h>
Markus Grabner1027f472010-08-12 01:35:30 +020013#include <linux/usb.h>
Takashi Iwaiccddbe42015-01-15 08:22:31 +010014#include <linux/export.h>
Markus Grabner705ecec2009-02-27 19:43:04 -080015#include <sound/core.h>
16#include <sound/rawmidi.h>
17
Markus Grabner1027f472010-08-12 01:35:30 +020018#include "driver.h"
Markus Grabner705ecec2009-02-27 19:43:04 -080019#include "midi.h"
Markus Grabner705ecec2009-02-27 19:43:04 -080020
Greg Kroah-Hartmand7e37332009-02-27 22:42:55 -080021#define line6_rawmidi_substream_midi(substream) \
22 ((struct snd_line6_midi *)((substream)->rmidi->private_data))
Markus Grabner705ecec2009-02-27 19:43:04 -080023
Greg Kroah-Hartmand7e37332009-02-27 22:42:55 -080024static int send_midi_async(struct usb_line6 *line6, unsigned char *data,
25 int length);
Markus Grabner705ecec2009-02-27 19:43:04 -080026
Markus Grabner705ecec2009-02-27 19:43:04 -080027/*
28 Pass data received via USB to MIDI.
29*/
Greg Kroah-Hartmand7e37332009-02-27 22:42:55 -080030void line6_midi_receive(struct usb_line6 *line6, unsigned char *data,
31 int length)
Markus Grabner705ecec2009-02-27 19:43:04 -080032{
Greg Kroah-Hartmand7e37332009-02-27 22:42:55 -080033 if (line6->line6midi->substream_receive)
34 snd_rawmidi_receive(line6->line6midi->substream_receive,
35 data, length);
Markus Grabner705ecec2009-02-27 19:43:04 -080036}
37
38/*
39 Read data from MIDI buffer and transmit them via USB.
40*/
41static void line6_midi_transmit(struct snd_rawmidi_substream *substream)
42{
Markus Grabnere1a164d2010-08-23 01:08:25 +020043 struct usb_line6 *line6 =
44 line6_rawmidi_substream_midi(substream)->line6;
Markus Grabner705ecec2009-02-27 19:43:04 -080045 struct snd_line6_midi *line6midi = line6->line6midi;
Stefan Hajnoczi269edc82013-01-11 23:08:09 +010046 struct midi_buffer *mb = &line6midi->midibuf_out;
Himangi Saraogif2459202014-03-09 05:47:12 +053047 unsigned char chunk[LINE6_FALLBACK_MAXPACKETSIZE];
Markus Grabner705ecec2009-02-27 19:43:04 -080048 int req, done;
49
Greg Kroah-Hartmand7e37332009-02-27 22:42:55 -080050 for (;;) {
Markus Grabner1027f472010-08-12 01:35:30 +020051 req = min(line6_midibuf_bytes_free(mb), line6->max_packet_size);
Markus Grabner705ecec2009-02-27 19:43:04 -080052 done = snd_rawmidi_transmit_peek(substream, chunk, req);
53
Greg Kroah-Hartmand7e37332009-02-27 22:42:55 -080054 if (done == 0)
Markus Grabner705ecec2009-02-27 19:43:04 -080055 break;
56
Markus Grabner1027f472010-08-12 01:35:30 +020057 line6_midibuf_write(mb, chunk, done);
Markus Grabner705ecec2009-02-27 19:43:04 -080058 snd_rawmidi_transmit_ack(substream, done);
59 }
60
Greg Kroah-Hartmand7e37332009-02-27 22:42:55 -080061 for (;;) {
Gulsah Kose64619002014-03-15 23:54:42 +020062 done = line6_midibuf_read(mb, chunk,
63 LINE6_FALLBACK_MAXPACKETSIZE);
Markus Grabner705ecec2009-02-27 19:43:04 -080064
Greg Kroah-Hartmand7e37332009-02-27 22:42:55 -080065 if (done == 0)
Markus Grabner705ecec2009-02-27 19:43:04 -080066 break;
67
Markus Grabner705ecec2009-02-27 19:43:04 -080068 send_midi_async(line6, chunk, done);
69 }
Markus Grabner705ecec2009-02-27 19:43:04 -080070}
71
72/*
73 Notification of completion of MIDI transmission.
74*/
Greg Kroah-Hartman0c7ab152009-02-27 20:28:04 -080075static void midi_sent(struct urb *urb)
Markus Grabner705ecec2009-02-27 19:43:04 -080076{
77 unsigned long flags;
78 int status;
79 int num;
80 struct usb_line6 *line6 = (struct usb_line6 *)urb->context;
81
82 status = urb->status;
83 kfree(urb->transfer_buffer);
84 usb_free_urb(urb);
85
Greg Kroah-Hartmand7e37332009-02-27 22:42:55 -080086 if (status == -ESHUTDOWN)
Markus Grabner705ecec2009-02-27 19:43:04 -080087 return;
88
Takashi Iwaibc518ba2015-01-23 12:39:11 +010089 spin_lock_irqsave(&line6->line6midi->lock, flags);
Markus Grabner705ecec2009-02-27 19:43:04 -080090 num = --line6->line6midi->num_active_send_urbs;
91
Greg Kroah-Hartmand7e37332009-02-27 22:42:55 -080092 if (num == 0) {
Markus Grabner705ecec2009-02-27 19:43:04 -080093 line6_midi_transmit(line6->line6midi->substream_transmit);
94 num = line6->line6midi->num_active_send_urbs;
95 }
96
Greg Kroah-Hartmand7e37332009-02-27 22:42:55 -080097 if (num == 0)
Markus Grabner1027f472010-08-12 01:35:30 +020098 wake_up(&line6->line6midi->send_wait);
Markus Grabner705ecec2009-02-27 19:43:04 -080099
Takashi Iwaibc518ba2015-01-23 12:39:11 +0100100 spin_unlock_irqrestore(&line6->line6midi->lock, flags);
Markus Grabner705ecec2009-02-27 19:43:04 -0800101}
102
103/*
104 Send an asynchronous MIDI message.
Takashi Iwaibc518ba2015-01-23 12:39:11 +0100105 Assumes that line6->line6midi->lock is held
Markus Grabner705ecec2009-02-27 19:43:04 -0800106 (i.e., this function is serialized).
107*/
Greg Kroah-Hartmand7e37332009-02-27 22:42:55 -0800108static int send_midi_async(struct usb_line6 *line6, unsigned char *data,
109 int length)
Markus Grabner705ecec2009-02-27 19:43:04 -0800110{
111 struct urb *urb;
112 int retval;
113 unsigned char *transfer_buffer;
114
115 urb = usb_alloc_urb(0, GFP_ATOMIC);
116
Takashi Iwaia019f5e2015-01-19 15:05:10 +0100117 if (urb == NULL)
Markus Grabner705ecec2009-02-27 19:43:04 -0800118 return -ENOMEM;
Markus Grabner705ecec2009-02-27 19:43:04 -0800119
Thomas Meyercff86382011-11-08 20:40:26 +0100120 transfer_buffer = kmemdup(data, length, GFP_ATOMIC);
Markus Grabner705ecec2009-02-27 19:43:04 -0800121
Peter Huewe597a1e72010-12-07 23:38:02 +0100122 if (transfer_buffer == NULL) {
Markus Grabner705ecec2009-02-27 19:43:04 -0800123 usb_free_urb(urb);
Markus Grabner705ecec2009-02-27 19:43:04 -0800124 return -ENOMEM;
125 }
126
Greg Kroah-Hartmand7e37332009-02-27 22:42:55 -0800127 usb_fill_int_urb(urb, line6->usbdev,
128 usb_sndbulkpipe(line6->usbdev,
Chris Rorvick9e165be2015-01-12 12:42:53 -0800129 line6->properties->ep_ctrl_w),
Greg Kroah-Hartmand7e37332009-02-27 22:42:55 -0800130 transfer_buffer, length, midi_sent, line6,
131 line6->interval);
Markus Grabner705ecec2009-02-27 19:43:04 -0800132 urb->actual_length = 0;
133 retval = usb_submit_urb(urb, GFP_ATOMIC);
134
Greg Kroah-Hartmand7e37332009-02-27 22:42:55 -0800135 if (retval < 0) {
Markus Grabner705ecec2009-02-27 19:43:04 -0800136 dev_err(line6->ifcdev, "usb_submit_urb failed\n");
137 usb_free_urb(urb);
Ashvini Varatharaj88ef9b12013-10-19 21:53:37 +0530138 return retval;
Markus Grabner705ecec2009-02-27 19:43:04 -0800139 }
140
141 ++line6->line6midi->num_active_send_urbs;
Markus Grabner705ecec2009-02-27 19:43:04 -0800142 return 0;
143}
144
145static int line6_midi_output_open(struct snd_rawmidi_substream *substream)
146{
147 return 0;
148}
149
150static int line6_midi_output_close(struct snd_rawmidi_substream *substream)
151{
152 return 0;
153}
154
Greg Kroah-Hartmand7e37332009-02-27 22:42:55 -0800155static void line6_midi_output_trigger(struct snd_rawmidi_substream *substream,
156 int up)
Markus Grabner705ecec2009-02-27 19:43:04 -0800157{
158 unsigned long flags;
Markus Grabnere1a164d2010-08-23 01:08:25 +0200159 struct usb_line6 *line6 =
160 line6_rawmidi_substream_midi(substream)->line6;
Markus Grabner705ecec2009-02-27 19:43:04 -0800161
162 line6->line6midi->substream_transmit = substream;
Takashi Iwaibc518ba2015-01-23 12:39:11 +0100163 spin_lock_irqsave(&line6->line6midi->lock, flags);
Markus Grabner705ecec2009-02-27 19:43:04 -0800164
Greg Kroah-Hartmand7e37332009-02-27 22:42:55 -0800165 if (line6->line6midi->num_active_send_urbs == 0)
Markus Grabner705ecec2009-02-27 19:43:04 -0800166 line6_midi_transmit(substream);
167
Takashi Iwaibc518ba2015-01-23 12:39:11 +0100168 spin_unlock_irqrestore(&line6->line6midi->lock, flags);
Markus Grabner705ecec2009-02-27 19:43:04 -0800169}
170
171static void line6_midi_output_drain(struct snd_rawmidi_substream *substream)
172{
Markus Grabnere1a164d2010-08-23 01:08:25 +0200173 struct usb_line6 *line6 =
174 line6_rawmidi_substream_midi(substream)->line6;
Markus Grabner1027f472010-08-12 01:35:30 +0200175 struct snd_line6_midi *midi = line6->line6midi;
Jerry Snitselaarf3c52612014-04-24 00:31:48 -0700176
Markus Grabnere1a164d2010-08-23 01:08:25 +0200177 wait_event_interruptible(midi->send_wait,
178 midi->num_active_send_urbs == 0);
Markus Grabner705ecec2009-02-27 19:43:04 -0800179}
180
181static int line6_midi_input_open(struct snd_rawmidi_substream *substream)
182{
183 return 0;
184}
185
186static int line6_midi_input_close(struct snd_rawmidi_substream *substream)
187{
188 return 0;
189}
190
Greg Kroah-Hartmand7e37332009-02-27 22:42:55 -0800191static void line6_midi_input_trigger(struct snd_rawmidi_substream *substream,
192 int up)
Markus Grabner705ecec2009-02-27 19:43:04 -0800193{
Markus Grabnere1a164d2010-08-23 01:08:25 +0200194 struct usb_line6 *line6 =
195 line6_rawmidi_substream_midi(substream)->line6;
Markus Grabner705ecec2009-02-27 19:43:04 -0800196
Greg Kroah-Hartmand7e37332009-02-27 22:42:55 -0800197 if (up)
Markus Grabner705ecec2009-02-27 19:43:04 -0800198 line6->line6midi->substream_receive = substream;
199 else
Sachin Kamata0d6f2b2013-10-09 15:58:26 +0530200 line6->line6midi->substream_receive = NULL;
Markus Grabner705ecec2009-02-27 19:43:04 -0800201}
202
203static struct snd_rawmidi_ops line6_midi_output_ops = {
204 .open = line6_midi_output_open,
205 .close = line6_midi_output_close,
206 .trigger = line6_midi_output_trigger,
207 .drain = line6_midi_output_drain,
208};
209
210static struct snd_rawmidi_ops line6_midi_input_ops = {
211 .open = line6_midi_input_open,
212 .close = line6_midi_input_close,
213 .trigger = line6_midi_input_trigger,
214};
215
Markus Grabner705ecec2009-02-27 19:43:04 -0800216/* Create a MIDI device */
Takashi Iwaiaaa68d22015-01-19 14:50:31 +0100217static int snd_line6_new_midi(struct usb_line6 *line6,
218 struct snd_rawmidi **rmidi_ret)
Markus Grabner705ecec2009-02-27 19:43:04 -0800219{
220 struct snd_rawmidi *rmidi;
221 int err;
222
Chris Rorvickc6fffce2015-01-20 02:20:49 -0600223 err = snd_rawmidi_new(line6->card, "Line 6 MIDI", 0, 1, 1, rmidi_ret);
Greg Kroah-Hartmand7e37332009-02-27 22:42:55 -0800224 if (err < 0)
Markus Grabner705ecec2009-02-27 19:43:04 -0800225 return err;
226
Takashi Iwaiaaa68d22015-01-19 14:50:31 +0100227 rmidi = *rmidi_ret;
228 strcpy(rmidi->id, line6->properties->id);
229 strcpy(rmidi->name, line6->properties->name);
Markus Grabner705ecec2009-02-27 19:43:04 -0800230
231 rmidi->info_flags =
Markus Grabnere1a164d2010-08-23 01:08:25 +0200232 SNDRV_RAWMIDI_INFO_OUTPUT |
233 SNDRV_RAWMIDI_INFO_INPUT | SNDRV_RAWMIDI_INFO_DUPLEX;
Markus Grabner705ecec2009-02-27 19:43:04 -0800234
Greg Kroah-Hartmand7e37332009-02-27 22:42:55 -0800235 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT,
236 &line6_midi_output_ops);
237 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT,
238 &line6_midi_input_ops);
Markus Grabner705ecec2009-02-27 19:43:04 -0800239 return 0;
240}
241
Markus Grabner705ecec2009-02-27 19:43:04 -0800242/* MIDI device destructor */
Takashi Iwaiaaa68d22015-01-19 14:50:31 +0100243static void snd_line6_midi_free(struct snd_rawmidi *rmidi)
Markus Grabner705ecec2009-02-27 19:43:04 -0800244{
Takashi Iwaiaaa68d22015-01-19 14:50:31 +0100245 struct snd_line6_midi *line6midi = rmidi->private_data;
Jerry Snitselaarf3c52612014-04-24 00:31:48 -0700246
Markus Grabner1027f472010-08-12 01:35:30 +0200247 line6_midibuf_destroy(&line6midi->midibuf_in);
248 line6_midibuf_destroy(&line6midi->midibuf_out);
Takashi Iwaiaaa68d22015-01-19 14:50:31 +0100249 kfree(line6midi);
Markus Grabner705ecec2009-02-27 19:43:04 -0800250}
251
252/*
Chris Rorvickc6fffce2015-01-20 02:20:49 -0600253 Initialize the Line 6 MIDI subsystem.
Markus Grabner705ecec2009-02-27 19:43:04 -0800254*/
255int line6_init_midi(struct usb_line6 *line6)
256{
Markus Grabner705ecec2009-02-27 19:43:04 -0800257 int err;
Takashi Iwaiaaa68d22015-01-19 14:50:31 +0100258 struct snd_rawmidi *rmidi;
Markus Grabner705ecec2009-02-27 19:43:04 -0800259 struct snd_line6_midi *line6midi;
260
Chris Rorvick4cb1a4a2015-01-12 12:42:45 -0800261 if (!(line6->properties->capabilities & LINE6_CAP_CONTROL)) {
Greg Kroah-Hartman027360c2010-09-21 16:58:00 -0700262 /* skip MIDI initialization and report success */
263 return 0;
264 }
Markus Grabner705ecec2009-02-27 19:43:04 -0800265
Takashi Iwaiaaa68d22015-01-19 14:50:31 +0100266 err = snd_line6_new_midi(line6, &rmidi);
267 if (err < 0)
268 return err;
Markus Grabner705ecec2009-02-27 19:43:04 -0800269
Takashi Iwaiaaa68d22015-01-19 14:50:31 +0100270 line6midi = kzalloc(sizeof(struct snd_line6_midi), GFP_KERNEL);
271 if (!line6midi)
Markus Grabner705ecec2009-02-27 19:43:04 -0800272 return -ENOMEM;
273
Takashi Iwaiaaa68d22015-01-19 14:50:31 +0100274 rmidi->private_data = line6midi;
275 rmidi->private_free = snd_line6_midi_free;
Markus Grabner705ecec2009-02-27 19:43:04 -0800276
Markus Grabner705ecec2009-02-27 19:43:04 -0800277 init_waitqueue_head(&line6midi->send_wait);
Takashi Iwaibc518ba2015-01-23 12:39:11 +0100278 spin_lock_init(&line6midi->lock);
Takashi Iwaiaaa68d22015-01-19 14:50:31 +0100279 line6midi->line6 = line6;
280
281 err = line6_midibuf_init(&line6midi->midibuf_in, MIDI_BUFFER_SIZE, 0);
282 if (err < 0)
283 return err;
284
285 err = line6_midibuf_init(&line6midi->midibuf_out, MIDI_BUFFER_SIZE, 1);
286 if (err < 0)
287 return err;
288
289 line6->line6midi = line6midi;
Markus Grabner705ecec2009-02-27 19:43:04 -0800290 return 0;
291}
Takashi Iwaiccddbe42015-01-15 08:22:31 +0100292EXPORT_SYMBOL_GPL(line6_init_midi);