2 * Line 6 Linux USB driver
4 * Copyright (C) 2004-2010 Markus Grabner (grabner@icg.tugraz.at)
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.
12 #include <linux/slab.h>
13 #include <linux/usb.h>
14 #include <linux/export.h>
15 #include <sound/core.h>
16 #include <sound/rawmidi.h>
21 #define line6_rawmidi_substream_midi(substream) \
22 ((struct snd_line6_midi *)((substream)->rmidi->private_data))
24 static int send_midi_async(struct usb_line6 *line6, unsigned char *data,
28 Pass data received via USB to MIDI.
30 void line6_midi_receive(struct usb_line6 *line6, unsigned char *data,
33 if (line6->line6midi->substream_receive)
34 snd_rawmidi_receive(line6->line6midi->substream_receive,
39 Read data from MIDI buffer and transmit them via USB.
41 static void line6_midi_transmit(struct snd_rawmidi_substream *substream)
43 struct usb_line6 *line6 =
44 line6_rawmidi_substream_midi(substream)->line6;
45 struct snd_line6_midi *line6midi = line6->line6midi;
46 struct midi_buffer *mb = &line6midi->midibuf_out;
47 unsigned char chunk[LINE6_FALLBACK_MAXPACKETSIZE];
51 req = min(line6_midibuf_bytes_free(mb), line6->max_packet_size);
52 done = snd_rawmidi_transmit_peek(substream, chunk, req);
57 line6_midibuf_write(mb, chunk, done);
58 snd_rawmidi_transmit_ack(substream, done);
62 done = line6_midibuf_read(mb, chunk,
63 LINE6_FALLBACK_MAXPACKETSIZE);
68 send_midi_async(line6, chunk, done);
73 Notification of completion of MIDI transmission.
75 static void midi_sent(struct urb *urb)
80 struct usb_line6 *line6 = (struct usb_line6 *)urb->context;
83 kfree(urb->transfer_buffer);
86 if (status == -ESHUTDOWN)
89 spin_lock_irqsave(&line6->line6midi->lock, flags);
90 num = --line6->line6midi->num_active_send_urbs;
93 line6_midi_transmit(line6->line6midi->substream_transmit);
94 num = line6->line6midi->num_active_send_urbs;
98 wake_up(&line6->line6midi->send_wait);
100 spin_unlock_irqrestore(&line6->line6midi->lock, flags);
104 Send an asynchronous MIDI message.
105 Assumes that line6->line6midi->lock is held
106 (i.e., this function is serialized).
108 static int send_midi_async(struct usb_line6 *line6, unsigned char *data,
113 unsigned char *transfer_buffer;
115 urb = usb_alloc_urb(0, GFP_ATOMIC);
120 transfer_buffer = kmemdup(data, length, GFP_ATOMIC);
122 if (transfer_buffer == NULL) {
127 usb_fill_int_urb(urb, line6->usbdev,
128 usb_sndbulkpipe(line6->usbdev,
129 line6->properties->ep_ctrl_w),
130 transfer_buffer, length, midi_sent, line6,
132 urb->actual_length = 0;
133 retval = usb_submit_urb(urb, GFP_ATOMIC);
136 dev_err(line6->ifcdev, "usb_submit_urb failed\n");
141 ++line6->line6midi->num_active_send_urbs;
145 static int line6_midi_output_open(struct snd_rawmidi_substream *substream)
150 static int line6_midi_output_close(struct snd_rawmidi_substream *substream)
155 static void line6_midi_output_trigger(struct snd_rawmidi_substream *substream,
159 struct usb_line6 *line6 =
160 line6_rawmidi_substream_midi(substream)->line6;
162 line6->line6midi->substream_transmit = substream;
163 spin_lock_irqsave(&line6->line6midi->lock, flags);
165 if (line6->line6midi->num_active_send_urbs == 0)
166 line6_midi_transmit(substream);
168 spin_unlock_irqrestore(&line6->line6midi->lock, flags);
171 static void line6_midi_output_drain(struct snd_rawmidi_substream *substream)
173 struct usb_line6 *line6 =
174 line6_rawmidi_substream_midi(substream)->line6;
175 struct snd_line6_midi *midi = line6->line6midi;
177 wait_event_interruptible(midi->send_wait,
178 midi->num_active_send_urbs == 0);
181 static int line6_midi_input_open(struct snd_rawmidi_substream *substream)
186 static int line6_midi_input_close(struct snd_rawmidi_substream *substream)
191 static void line6_midi_input_trigger(struct snd_rawmidi_substream *substream,
194 struct usb_line6 *line6 =
195 line6_rawmidi_substream_midi(substream)->line6;
198 line6->line6midi->substream_receive = substream;
200 line6->line6midi->substream_receive = NULL;
203 static 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,
210 static 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,
216 /* Create a MIDI device */
217 static int snd_line6_new_midi(struct usb_line6 *line6,
218 struct snd_rawmidi **rmidi_ret)
220 struct snd_rawmidi *rmidi;
223 err = snd_rawmidi_new(line6->card, "Line 6 MIDI", 0, 1, 1, rmidi_ret);
228 strcpy(rmidi->id, line6->properties->id);
229 strcpy(rmidi->name, line6->properties->name);
232 SNDRV_RAWMIDI_INFO_OUTPUT |
233 SNDRV_RAWMIDI_INFO_INPUT | SNDRV_RAWMIDI_INFO_DUPLEX;
235 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);
242 /* MIDI device destructor */
243 static void snd_line6_midi_free(struct snd_rawmidi *rmidi)
245 struct snd_line6_midi *line6midi = rmidi->private_data;
247 line6_midibuf_destroy(&line6midi->midibuf_in);
248 line6_midibuf_destroy(&line6midi->midibuf_out);
253 Initialize the Line 6 MIDI subsystem.
255 int line6_init_midi(struct usb_line6 *line6)
258 struct snd_rawmidi *rmidi;
259 struct snd_line6_midi *line6midi;
261 if (!(line6->properties->capabilities & LINE6_CAP_CONTROL)) {
262 /* skip MIDI initialization and report success */
266 err = snd_line6_new_midi(line6, &rmidi);
270 line6midi = kzalloc(sizeof(struct snd_line6_midi), GFP_KERNEL);
274 rmidi->private_data = line6midi;
275 rmidi->private_free = snd_line6_midi_free;
277 init_waitqueue_head(&line6midi->send_wait);
278 spin_lock_init(&line6midi->lock);
279 line6midi->line6 = line6;
281 err = line6_midibuf_init(&line6midi->midibuf_in, MIDI_BUFFER_SIZE, 0);
285 err = line6_midibuf_init(&line6midi->midibuf_out, MIDI_BUFFER_SIZE, 1);
289 line6->line6midi = line6midi;
292 EXPORT_SYMBOL_GPL(line6_init_midi);