2 * Copyright (C) by Paul Barton-Davis 1998-1999
4 * This file is distributed under the GNU GENERAL PUBLIC LICENSE (GPL)
5 * Version 2 (June 1991). See the "COPYING" file distributed with this
6 * software for more info.
9 /* The low level driver for the WaveFront ICS2115 MIDI interface(s)
11 * Note that there is also an MPU-401 emulation (actually, a UART-401
12 * emulation) on the CS4232 on the Tropez and Tropez Plus. This code
13 * has nothing to do with that interface at all.
15 * The interface is essentially just a UART-401, but is has the
16 * interesting property of supporting what Turtle Beach called
17 * "Virtual MIDI" mode. In this mode, there are effectively *two*
18 * MIDI buses accessible via the interface, one that is routed
19 * solely to/from the external WaveFront synthesizer and the other
20 * corresponding to the pin/socket connector used to link external
21 * MIDI devices to the board.
23 * This driver fully supports this mode, allowing two distinct MIDI
24 * busses to be used completely independently, giving 32 channels of
25 * MIDI routing, 16 to the WaveFront synth and 16 to the external MIDI
26 * bus. The devices are named /dev/snd/midiCnD0 and /dev/snd/midiCnD1,
27 * where `n' is the card number. Note that the device numbers may be
28 * something other than 0 and 1 if the CS4232 UART/MPU-401 interface
31 * Switching between the two is accomplished externally by the driver
32 * using the two otherwise unused MIDI bytes. See the code for more details.
34 * NOTE: VIRTUAL MIDI MODE IS ON BY DEFAULT (see lowlevel/isa/wavefront.c)
36 * The main reason to turn off Virtual MIDI mode is when you want to
37 * tightly couple the WaveFront synth with an external MIDI
38 * device. You won't be able to distinguish the source of any MIDI
39 * data except via SysEx ID, but thats probably OK, since for the most
40 * part, the WaveFront won't be sending any MIDI data at all.
42 * The main reason to turn on Virtual MIDI Mode is to provide two
43 * completely independent 16-channel MIDI buses, one to the
44 * WaveFront and one to any external MIDI devices. Given the 32
45 * voice nature of the WaveFront, its pretty easy to find a use
46 * for all 16 channels driving just that synth.
51 #include <linux/init.h>
52 #include <linux/time.h>
53 #include <linux/wait.h>
54 #include <sound/core.h>
55 #include <sound/snd_wavefront.h>
58 wf_mpu_status (snd_wavefront_midi_t *midi)
61 return inb (midi->mpu_status_port);
65 input_avail (snd_wavefront_midi_t *midi)
68 return !(wf_mpu_status(midi) & INPUT_AVAIL);
72 output_ready (snd_wavefront_midi_t *midi)
75 return !(wf_mpu_status(midi) & OUTPUT_READY);
79 read_data (snd_wavefront_midi_t *midi)
82 return inb (midi->mpu_data_port);
86 write_data (snd_wavefront_midi_t *midi, unsigned char byte)
89 outb (byte, midi->mpu_data_port);
92 static snd_wavefront_midi_t *
93 get_wavefront_midi (struct snd_rawmidi_substream *substream)
96 struct snd_card *card;
97 snd_wavefront_card_t *acard;
99 if (substream == NULL || substream->rmidi == NULL)
102 card = substream->rmidi->card;
107 if (card->private_data == NULL)
110 acard = card->private_data;
112 return &acard->wavefront.midi;
115 static void snd_wavefront_midi_output_write(snd_wavefront_card_t *card)
117 snd_wavefront_midi_t *midi = &card->wavefront.midi;
118 snd_wavefront_mpu_id mpu;
120 unsigned char midi_byte;
121 int max = 256, mask = 1;
124 /* Its not OK to try to change the status of "virtuality" of
125 the MIDI interface while we're outputting stuff. See
126 snd_wavefront_midi_{enable,disable}_virtual () for the
129 The first loop attempts to flush any data from the
130 current output device, and then the second
131 emits the switch byte (if necessary), and starts
132 outputting data for the output device currently in use.
135 if (midi->substream_output[midi->output_mpu] == NULL) {
141 /* XXX fix me - no hard timing loops allowed! */
143 for (timeout = 30000; timeout > 0; timeout--) {
144 if (output_ready (midi))
148 spin_lock_irqsave (&midi->virtual, flags);
149 if ((midi->mode[midi->output_mpu] & MPU401_MODE_OUTPUT) == 0) {
150 spin_unlock_irqrestore (&midi->virtual, flags);
153 if (output_ready (midi)) {
154 if (snd_rawmidi_transmit(midi->substream_output[midi->output_mpu], &midi_byte, 1) == 1) {
155 if (!midi->isvirtual ||
156 (midi_byte != WF_INTERNAL_SWITCH &&
157 midi_byte != WF_EXTERNAL_SWITCH))
158 write_data(midi, midi_byte);
162 if (--midi->istimer <= 0)
163 del_timer(&midi->timer);
165 midi->mode[midi->output_mpu] &= ~MPU401_MODE_OUTPUT_TRIGGER;
166 spin_unlock_irqrestore (&midi->virtual, flags);
170 spin_unlock_irqrestore (&midi->virtual, flags);
173 spin_unlock_irqrestore (&midi->virtual, flags);
178 if (midi->substream_output[!midi->output_mpu] == NULL) {
184 /* XXX fix me - no hard timing loops allowed! */
186 for (timeout = 30000; timeout > 0; timeout--) {
187 if (output_ready (midi))
191 spin_lock_irqsave (&midi->virtual, flags);
192 if (!midi->isvirtual)
194 mpu = midi->output_mpu ^ mask;
195 mask = 0; /* don't invert the value from now */
196 if ((midi->mode[mpu] & MPU401_MODE_OUTPUT) == 0) {
197 spin_unlock_irqrestore (&midi->virtual, flags);
200 if (snd_rawmidi_transmit_empty(midi->substream_output[mpu]))
202 if (output_ready (midi)) {
203 if (mpu != midi->output_mpu) {
204 write_data(midi, mpu == internal_mpu ?
207 midi->output_mpu = mpu;
208 } else if (snd_rawmidi_transmit(midi->substream_output[mpu], &midi_byte, 1) == 1) {
209 if (!midi->isvirtual ||
210 (midi_byte != WF_INTERNAL_SWITCH &&
211 midi_byte != WF_EXTERNAL_SWITCH))
212 write_data(midi, midi_byte);
217 if (--midi->istimer <= 0)
218 del_timer(&midi->timer);
220 midi->mode[mpu] &= ~MPU401_MODE_OUTPUT_TRIGGER;
221 spin_unlock_irqrestore (&midi->virtual, flags);
225 spin_unlock_irqrestore (&midi->virtual, flags);
228 spin_unlock_irqrestore (&midi->virtual, flags);
232 static int snd_wavefront_midi_input_open(struct snd_rawmidi_substream *substream)
235 snd_wavefront_midi_t *midi;
236 snd_wavefront_mpu_id mpu;
238 snd_assert(substream != NULL && substream->rmidi != NULL, return -EIO);
239 snd_assert(substream->rmidi->private_data != NULL, return -EIO);
241 mpu = *((snd_wavefront_mpu_id *) substream->rmidi->private_data);
243 if ((midi = get_wavefront_midi (substream)) == NULL)
246 spin_lock_irqsave (&midi->open, flags);
247 midi->mode[mpu] |= MPU401_MODE_INPUT;
248 midi->substream_input[mpu] = substream;
249 spin_unlock_irqrestore (&midi->open, flags);
254 static int snd_wavefront_midi_output_open(struct snd_rawmidi_substream *substream)
257 snd_wavefront_midi_t *midi;
258 snd_wavefront_mpu_id mpu;
260 snd_assert(substream != NULL && substream->rmidi != NULL, return -EIO);
261 snd_assert(substream->rmidi->private_data != NULL, return -EIO);
263 mpu = *((snd_wavefront_mpu_id *) substream->rmidi->private_data);
265 if ((midi = get_wavefront_midi (substream)) == NULL)
268 spin_lock_irqsave (&midi->open, flags);
269 midi->mode[mpu] |= MPU401_MODE_OUTPUT;
270 midi->substream_output[mpu] = substream;
271 spin_unlock_irqrestore (&midi->open, flags);
276 static int snd_wavefront_midi_input_close(struct snd_rawmidi_substream *substream)
279 snd_wavefront_midi_t *midi;
280 snd_wavefront_mpu_id mpu;
282 snd_assert(substream != NULL && substream->rmidi != NULL, return -EIO);
283 snd_assert(substream->rmidi->private_data != NULL, return -EIO);
285 mpu = *((snd_wavefront_mpu_id *) substream->rmidi->private_data);
287 if ((midi = get_wavefront_midi (substream)) == NULL)
290 spin_lock_irqsave (&midi->open, flags);
291 midi->mode[mpu] &= ~MPU401_MODE_INPUT;
292 spin_unlock_irqrestore (&midi->open, flags);
297 static int snd_wavefront_midi_output_close(struct snd_rawmidi_substream *substream)
300 snd_wavefront_midi_t *midi;
301 snd_wavefront_mpu_id mpu;
303 snd_assert(substream != NULL && substream->rmidi != NULL, return -EIO);
304 snd_assert(substream->rmidi->private_data != NULL, return -EIO);
306 mpu = *((snd_wavefront_mpu_id *) substream->rmidi->private_data);
308 if ((midi = get_wavefront_midi (substream)) == NULL)
311 spin_lock_irqsave (&midi->open, flags);
312 midi->mode[mpu] &= ~MPU401_MODE_OUTPUT;
313 spin_unlock_irqrestore (&midi->open, flags);
317 static void snd_wavefront_midi_input_trigger(struct snd_rawmidi_substream *substream, int up)
320 snd_wavefront_midi_t *midi;
321 snd_wavefront_mpu_id mpu;
323 if (substream == NULL || substream->rmidi == NULL)
326 if (substream->rmidi->private_data == NULL)
329 mpu = *((snd_wavefront_mpu_id *) substream->rmidi->private_data);
331 if ((midi = get_wavefront_midi (substream)) == NULL) {
335 spin_lock_irqsave (&midi->virtual, flags);
337 midi->mode[mpu] |= MPU401_MODE_INPUT_TRIGGER;
339 midi->mode[mpu] &= ~MPU401_MODE_INPUT_TRIGGER;
341 spin_unlock_irqrestore (&midi->virtual, flags);
344 static void snd_wavefront_midi_output_timer(unsigned long data)
346 snd_wavefront_card_t *card = (snd_wavefront_card_t *)data;
347 snd_wavefront_midi_t *midi = &card->wavefront.midi;
350 spin_lock_irqsave (&midi->virtual, flags);
351 midi->timer.expires = 1 + jiffies;
352 add_timer(&midi->timer);
353 spin_unlock_irqrestore (&midi->virtual, flags);
354 snd_wavefront_midi_output_write(card);
357 static void snd_wavefront_midi_output_trigger(struct snd_rawmidi_substream *substream, int up)
360 snd_wavefront_midi_t *midi;
361 snd_wavefront_mpu_id mpu;
363 if (substream == NULL || substream->rmidi == NULL)
366 if (substream->rmidi->private_data == NULL)
369 mpu = *((snd_wavefront_mpu_id *) substream->rmidi->private_data);
371 if ((midi = get_wavefront_midi (substream)) == NULL) {
375 spin_lock_irqsave (&midi->virtual, flags);
377 if ((midi->mode[mpu] & MPU401_MODE_OUTPUT_TRIGGER) == 0) {
378 if (!midi->istimer) {
379 init_timer(&midi->timer);
380 midi->timer.function = snd_wavefront_midi_output_timer;
381 midi->timer.data = (unsigned long) substream->rmidi->card->private_data;
382 midi->timer.expires = 1 + jiffies;
383 add_timer(&midi->timer);
386 midi->mode[mpu] |= MPU401_MODE_OUTPUT_TRIGGER;
389 midi->mode[mpu] &= ~MPU401_MODE_OUTPUT_TRIGGER;
391 spin_unlock_irqrestore (&midi->virtual, flags);
394 snd_wavefront_midi_output_write((snd_wavefront_card_t *)substream->rmidi->card->private_data);
398 snd_wavefront_midi_interrupt (snd_wavefront_card_t *card)
402 snd_wavefront_midi_t *midi;
403 static struct snd_rawmidi_substream *substream = NULL;
404 static int mpu = external_mpu;
408 midi = &card->wavefront.midi;
410 if (!input_avail (midi)) { /* not for us */
411 snd_wavefront_midi_output_write(card);
415 spin_lock_irqsave (&midi->virtual, flags);
418 if (input_avail (midi)) {
419 byte = read_data (midi);
421 if (midi->isvirtual) {
422 if (byte == WF_EXTERNAL_SWITCH) {
423 substream = midi->substream_input[external_mpu];
425 } else if (byte == WF_INTERNAL_SWITCH) {
426 substream = midi->substream_output[internal_mpu];
428 } /* else just leave it as it is */
430 substream = midi->substream_input[internal_mpu];
434 if (substream == NULL) {
438 if (midi->mode[mpu] & MPU401_MODE_INPUT_TRIGGER) {
439 snd_rawmidi_receive(substream, &byte, 1);
445 spin_unlock_irqrestore (&midi->virtual, flags);
447 snd_wavefront_midi_output_write(card);
451 snd_wavefront_midi_enable_virtual (snd_wavefront_card_t *card)
456 spin_lock_irqsave (&card->wavefront.midi.virtual, flags);
457 card->wavefront.midi.isvirtual = 1;
458 card->wavefront.midi.output_mpu = internal_mpu;
459 card->wavefront.midi.input_mpu = internal_mpu;
460 spin_unlock_irqrestore (&card->wavefront.midi.virtual, flags);
464 snd_wavefront_midi_disable_virtual (snd_wavefront_card_t *card)
469 spin_lock_irqsave (&card->wavefront.midi.virtual, flags);
470 // snd_wavefront_midi_input_close (card->ics2115_external_rmidi);
471 // snd_wavefront_midi_output_close (card->ics2115_external_rmidi);
472 card->wavefront.midi.isvirtual = 0;
473 spin_unlock_irqrestore (&card->wavefront.midi.virtual, flags);
477 snd_wavefront_midi_start (snd_wavefront_card_t *card)
481 unsigned char rbuf[4], wbuf[4];
482 snd_wavefront_t *dev;
483 snd_wavefront_midi_t *midi;
485 dev = &card->wavefront;
488 /* The ICS2115 MPU-401 interface doesn't do anything
489 until its set into UART mode.
492 /* XXX fix me - no hard timing loops allowed! */
494 for (i = 0; i < 30000 && !output_ready (midi); i++);
496 if (!output_ready (midi)) {
497 snd_printk ("MIDI interface not ready for command\n");
501 /* Any interrupts received from now on
502 are owned by the MIDI side of things.
505 dev->interrupts_are_midi = 1;
507 outb (UART_MODE_ON, midi->mpu_command_port);
509 for (ok = 0, i = 50000; i > 0 && !ok; i--) {
510 if (input_avail (midi)) {
511 if (read_data (midi) == MPU_ACK) {
519 snd_printk ("cannot set UART mode for MIDI interface");
520 dev->interrupts_are_midi = 0;
524 /* Route external MIDI to WaveFront synth (by default) */
526 if (snd_wavefront_cmd (dev, WFC_MISYNTH_ON, rbuf, wbuf)) {
527 snd_printk ("can't enable MIDI-IN-2-synth routing.\n");
531 /* Turn on Virtual MIDI, but first *always* turn it off,
532 since otherwise consectutive reloads of the driver will
533 never cause the hardware to generate the initial "internal" or
534 "external" source bytes in the MIDI data stream. This
535 is pretty important, since the internal hardware generally will
536 be used to generate none or very little MIDI output, and
537 thus the only source of MIDI data is actually external. Without
538 the switch bytes, the driver will think it all comes from
539 the internal interface. Duh.
542 if (snd_wavefront_cmd (dev, WFC_VMIDI_OFF, rbuf, wbuf)) {
543 snd_printk ("virtual MIDI mode not disabled\n");
544 return 0; /* We're OK, but missing the external MIDI dev */
547 snd_wavefront_midi_enable_virtual (card);
549 if (snd_wavefront_cmd (dev, WFC_VMIDI_ON, rbuf, wbuf)) {
550 snd_printk ("cannot enable virtual MIDI mode.\n");
551 snd_wavefront_midi_disable_virtual (card);
556 struct snd_rawmidi_ops snd_wavefront_midi_output =
558 .open = snd_wavefront_midi_output_open,
559 .close = snd_wavefront_midi_output_close,
560 .trigger = snd_wavefront_midi_output_trigger,
563 struct snd_rawmidi_ops snd_wavefront_midi_input =
565 .open = snd_wavefront_midi_input_open,
566 .close = snd_wavefront_midi_input_close,
567 .trigger = snd_wavefront_midi_input_trigger,