2 * Line6 Linux USB driver - 0.9.1beta
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 <sound/core.h>
15 #include <sound/rawmidi.h>
23 #define line6_rawmidi_substream_midi(substream) \
24 ((struct snd_line6_midi *)((substream)->rmidi->private_data))
26 static int send_midi_async(struct usb_line6 *line6, unsigned char *data,
30 Pass data received via USB to MIDI.
32 void line6_midi_receive(struct usb_line6 *line6, unsigned char *data,
35 if (line6->line6midi->substream_receive)
36 snd_rawmidi_receive(line6->line6midi->substream_receive,
41 Read data from MIDI buffer and transmit them via USB.
43 static void line6_midi_transmit(struct snd_rawmidi_substream *substream)
45 struct usb_line6 *line6 =
46 line6_rawmidi_substream_midi(substream)->line6;
47 struct snd_line6_midi *line6midi = line6->line6midi;
48 struct MidiBuffer *mb = &line6midi->midibuf_out;
50 unsigned char chunk[line6->max_packet_size];
53 spin_lock_irqsave(&line6->line6midi->midi_transmit_lock, flags);
56 req = min(line6_midibuf_bytes_free(mb), line6->max_packet_size);
57 done = snd_rawmidi_transmit_peek(substream, chunk, req);
62 line6_midibuf_write(mb, chunk, done);
63 snd_rawmidi_transmit_ack(substream, done);
67 done = line6_midibuf_read(mb, chunk, line6->max_packet_size);
72 send_midi_async(line6, chunk, done);
75 spin_unlock_irqrestore(&line6->line6midi->midi_transmit_lock, flags);
79 Notification of completion of MIDI transmission.
81 static void midi_sent(struct urb *urb)
86 struct usb_line6 *line6 = (struct usb_line6 *)urb->context;
89 kfree(urb->transfer_buffer);
92 if (status == -ESHUTDOWN)
95 spin_lock_irqsave(&line6->line6midi->send_urb_lock, flags);
96 num = --line6->line6midi->num_active_send_urbs;
99 line6_midi_transmit(line6->line6midi->substream_transmit);
100 num = line6->line6midi->num_active_send_urbs;
104 wake_up(&line6->line6midi->send_wait);
106 spin_unlock_irqrestore(&line6->line6midi->send_urb_lock, flags);
110 Send an asynchronous MIDI message.
111 Assumes that line6->line6midi->send_urb_lock is held
112 (i.e., this function is serialized).
114 static int send_midi_async(struct usb_line6 *line6, unsigned char *data,
119 unsigned char *transfer_buffer;
121 urb = usb_alloc_urb(0, GFP_ATOMIC);
124 dev_err(line6->ifcdev, "Out of memory\n");
128 transfer_buffer = kmemdup(data, length, GFP_ATOMIC);
130 if (transfer_buffer == NULL) {
132 dev_err(line6->ifcdev, "Out of memory\n");
136 usb_fill_int_urb(urb, line6->usbdev,
137 usb_sndbulkpipe(line6->usbdev,
138 line6->ep_control_write),
139 transfer_buffer, length, midi_sent, line6,
141 urb->actual_length = 0;
142 retval = usb_submit_urb(urb, GFP_ATOMIC);
145 dev_err(line6->ifcdev, "usb_submit_urb failed\n");
150 ++line6->line6midi->num_active_send_urbs;
154 static int line6_midi_output_open(struct snd_rawmidi_substream *substream)
159 static int line6_midi_output_close(struct snd_rawmidi_substream *substream)
164 static void line6_midi_output_trigger(struct snd_rawmidi_substream *substream,
168 struct usb_line6 *line6 =
169 line6_rawmidi_substream_midi(substream)->line6;
171 line6->line6midi->substream_transmit = substream;
172 spin_lock_irqsave(&line6->line6midi->send_urb_lock, flags);
174 if (line6->line6midi->num_active_send_urbs == 0)
175 line6_midi_transmit(substream);
177 spin_unlock_irqrestore(&line6->line6midi->send_urb_lock, flags);
180 static void line6_midi_output_drain(struct snd_rawmidi_substream *substream)
182 struct usb_line6 *line6 =
183 line6_rawmidi_substream_midi(substream)->line6;
184 struct snd_line6_midi *midi = line6->line6midi;
185 wait_event_interruptible(midi->send_wait,
186 midi->num_active_send_urbs == 0);
189 static int line6_midi_input_open(struct snd_rawmidi_substream *substream)
194 static int line6_midi_input_close(struct snd_rawmidi_substream *substream)
199 static void line6_midi_input_trigger(struct snd_rawmidi_substream *substream,
202 struct usb_line6 *line6 =
203 line6_rawmidi_substream_midi(substream)->line6;
206 line6->line6midi->substream_receive = substream;
208 line6->line6midi->substream_receive = 0;
211 static struct snd_rawmidi_ops line6_midi_output_ops = {
212 .open = line6_midi_output_open,
213 .close = line6_midi_output_close,
214 .trigger = line6_midi_output_trigger,
215 .drain = line6_midi_output_drain,
218 static struct snd_rawmidi_ops line6_midi_input_ops = {
219 .open = line6_midi_input_open,
220 .close = line6_midi_input_close,
221 .trigger = line6_midi_input_trigger,
225 Cleanup the Line6 MIDI device.
227 static void line6_cleanup_midi(struct snd_rawmidi *rmidi)
231 /* Create a MIDI device */
232 static int snd_line6_new_midi(struct snd_line6_midi *line6midi)
234 struct snd_rawmidi *rmidi;
237 err = snd_rawmidi_new(line6midi->line6->card, "Line6 MIDI", 0, 1, 1,
242 rmidi->private_data = line6midi;
243 rmidi->private_free = line6_cleanup_midi;
244 strcpy(rmidi->id, line6midi->line6->properties->id);
245 strcpy(rmidi->name, line6midi->line6->properties->name);
248 SNDRV_RAWMIDI_INFO_OUTPUT |
249 SNDRV_RAWMIDI_INFO_INPUT | SNDRV_RAWMIDI_INFO_DUPLEX;
251 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT,
252 &line6_midi_output_ops);
253 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT,
254 &line6_midi_input_ops);
258 /* MIDI device destructor */
259 static int snd_line6_midi_free(struct snd_device *device)
261 struct snd_line6_midi *line6midi = device->device_data;
262 line6_midibuf_destroy(&line6midi->midibuf_in);
263 line6_midibuf_destroy(&line6midi->midibuf_out);
268 Initialize the Line6 MIDI subsystem.
270 int line6_init_midi(struct usb_line6 *line6)
272 static struct snd_device_ops midi_ops = {
273 .dev_free = snd_line6_midi_free,
277 struct snd_line6_midi *line6midi;
279 if (!(line6->properties->capabilities & LINE6_BIT_CONTROL)) {
280 /* skip MIDI initialization and report success */
284 line6midi = kzalloc(sizeof(struct snd_line6_midi), GFP_KERNEL);
286 if (line6midi == NULL)
289 err = line6_midibuf_init(&line6midi->midibuf_in, MIDI_BUFFER_SIZE, 0);
295 err = line6_midibuf_init(&line6midi->midibuf_out, MIDI_BUFFER_SIZE, 1);
297 kfree(line6midi->midibuf_in.buf);
302 line6midi->line6 = line6;
303 line6->line6midi = line6midi;
305 err = snd_device_new(line6->card, SNDRV_DEV_RAWMIDI, line6midi,
310 snd_card_set_dev(line6->card, line6->ifcdev);
312 err = snd_line6_new_midi(line6midi);
316 init_waitqueue_head(&line6midi->send_wait);
317 spin_lock_init(&line6midi->send_urb_lock);
318 spin_lock_init(&line6midi->midi_transmit_lock);