2 * OSS compatible sequencer driver
6 * Copyright (C) 1998,99 Takashi Iwai <tiwai@suse.de>
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 #include <sound/asoundef.h>
24 #include "seq_oss_midi.h"
25 #include "seq_oss_readq.h"
26 #include "seq_oss_timer.h"
27 #include "seq_oss_event.h"
28 #include <sound/seq_midi_event.h>
29 #include "../seq_lock.h"
30 #include <linux/init.h>
31 #include <linux/slab.h>
32 #include <linux/nospec.h>
38 #define SNDRV_SEQ_OSS_MAX_MIDI_NAME 30
41 * definition of midi device record
44 int seq_device; /* device number */
45 int client; /* sequencer client number */
46 int port; /* sequencer port number */
47 unsigned int flags; /* port capability */
48 int opened; /* flag for opening */
49 unsigned char name[SNDRV_SEQ_OSS_MAX_MIDI_NAME];
50 struct snd_midi_event *coder; /* MIDI event coder */
51 struct seq_oss_devinfo *devinfo; /* assigned OSSseq device */
52 snd_use_lock_t use_lock;
53 struct mutex open_mutex;
60 static int max_midi_devs;
61 static struct seq_oss_midi *midi_devs[SNDRV_SEQ_OSS_MAX_MIDI_DEVS];
63 static DEFINE_SPINLOCK(register_lock);
68 static struct seq_oss_midi *get_mdev(int dev);
69 static struct seq_oss_midi *get_mididev(struct seq_oss_devinfo *dp, int dev);
70 static int send_synth_event(struct seq_oss_devinfo *dp, struct snd_seq_event *ev, int dev);
71 static int send_midi_event(struct seq_oss_devinfo *dp, struct snd_seq_event *ev, struct seq_oss_midi *mdev);
74 * look up the existing ports
75 * this looks a very exhausting job.
78 snd_seq_oss_midi_lookup_ports(int client)
80 struct snd_seq_client_info *clinfo;
81 struct snd_seq_port_info *pinfo;
83 clinfo = kzalloc(sizeof(*clinfo), GFP_KERNEL);
84 pinfo = kzalloc(sizeof(*pinfo), GFP_KERNEL);
85 if (! clinfo || ! pinfo) {
91 while (snd_seq_kernel_client_ctl(client, SNDRV_SEQ_IOCTL_QUERY_NEXT_CLIENT, clinfo) == 0) {
92 if (clinfo->client == client)
93 continue; /* ignore myself */
94 pinfo->addr.client = clinfo->client;
95 pinfo->addr.port = -1;
96 while (snd_seq_kernel_client_ctl(client, SNDRV_SEQ_IOCTL_QUERY_NEXT_PORT, pinfo) == 0)
97 snd_seq_oss_midi_check_new_port(pinfo);
107 static struct seq_oss_midi *
110 struct seq_oss_midi *mdev;
113 spin_lock_irqsave(®ister_lock, flags);
114 mdev = midi_devs[dev];
116 snd_use_lock_use(&mdev->use_lock);
117 spin_unlock_irqrestore(®ister_lock, flags);
122 * look for the identical slot
124 static struct seq_oss_midi *
125 find_slot(int client, int port)
128 struct seq_oss_midi *mdev;
131 spin_lock_irqsave(®ister_lock, flags);
132 for (i = 0; i < max_midi_devs; i++) {
134 if (mdev && mdev->client == client && mdev->port == port) {
136 snd_use_lock_use(&mdev->use_lock);
137 spin_unlock_irqrestore(®ister_lock, flags);
141 spin_unlock_irqrestore(®ister_lock, flags);
146 #define PERM_WRITE (SNDRV_SEQ_PORT_CAP_WRITE|SNDRV_SEQ_PORT_CAP_SUBS_WRITE)
147 #define PERM_READ (SNDRV_SEQ_PORT_CAP_READ|SNDRV_SEQ_PORT_CAP_SUBS_READ)
149 * register a new port if it doesn't exist yet
152 snd_seq_oss_midi_check_new_port(struct snd_seq_port_info *pinfo)
155 struct seq_oss_midi *mdev;
158 /* the port must include generic midi */
159 if (! (pinfo->type & SNDRV_SEQ_PORT_TYPE_MIDI_GENERIC))
161 /* either read or write subscribable */
162 if ((pinfo->capability & PERM_WRITE) != PERM_WRITE &&
163 (pinfo->capability & PERM_READ) != PERM_READ)
167 * look for the identical slot
169 if ((mdev = find_slot(pinfo->addr.client, pinfo->addr.port)) != NULL) {
171 snd_use_lock_free(&mdev->use_lock);
176 * allocate midi info record
178 mdev = kzalloc(sizeof(*mdev), GFP_KERNEL);
182 /* copy the port information */
183 mdev->client = pinfo->addr.client;
184 mdev->port = pinfo->addr.port;
185 mdev->flags = pinfo->capability;
187 snd_use_lock_init(&mdev->use_lock);
188 mutex_init(&mdev->open_mutex);
190 /* copy and truncate the name of synth device */
191 strlcpy(mdev->name, pinfo->name, sizeof(mdev->name));
193 /* create MIDI coder */
194 if (snd_midi_event_new(MAX_MIDI_EVENT_BUF, &mdev->coder) < 0) {
195 pr_err("ALSA: seq_oss: can't malloc midi coder\n");
199 /* OSS sequencer adds running status to all sequences */
200 snd_midi_event_no_status(mdev->coder, 1);
203 * look for en empty slot
205 spin_lock_irqsave(®ister_lock, flags);
206 for (i = 0; i < max_midi_devs; i++) {
207 if (midi_devs[i] == NULL)
210 if (i >= max_midi_devs) {
211 if (max_midi_devs >= SNDRV_SEQ_OSS_MAX_MIDI_DEVS) {
212 spin_unlock_irqrestore(®ister_lock, flags);
213 snd_midi_event_free(mdev->coder);
219 mdev->seq_device = i;
220 midi_devs[mdev->seq_device] = mdev;
221 spin_unlock_irqrestore(®ister_lock, flags);
227 * release the midi device if it was registered
230 snd_seq_oss_midi_check_exit_port(int client, int port)
232 struct seq_oss_midi *mdev;
236 if ((mdev = find_slot(client, port)) != NULL) {
237 spin_lock_irqsave(®ister_lock, flags);
238 midi_devs[mdev->seq_device] = NULL;
239 spin_unlock_irqrestore(®ister_lock, flags);
240 snd_use_lock_free(&mdev->use_lock);
241 snd_use_lock_sync(&mdev->use_lock);
242 snd_midi_event_free(mdev->coder);
245 spin_lock_irqsave(®ister_lock, flags);
246 for (index = max_midi_devs - 1; index >= 0; index--) {
247 if (midi_devs[index])
250 max_midi_devs = index + 1;
251 spin_unlock_irqrestore(®ister_lock, flags);
257 * release the midi device if it was registered
260 snd_seq_oss_midi_clear_all(void)
263 struct seq_oss_midi *mdev;
266 spin_lock_irqsave(®ister_lock, flags);
267 for (i = 0; i < max_midi_devs; i++) {
268 if ((mdev = midi_devs[i]) != NULL) {
269 snd_midi_event_free(mdev->coder);
275 spin_unlock_irqrestore(®ister_lock, flags);
283 snd_seq_oss_midi_setup(struct seq_oss_devinfo *dp)
285 spin_lock_irq(®ister_lock);
286 dp->max_mididev = max_midi_devs;
287 spin_unlock_irq(®ister_lock);
291 * clean up midi tables
294 snd_seq_oss_midi_cleanup(struct seq_oss_devinfo *dp)
297 for (i = 0; i < dp->max_mididev; i++)
298 snd_seq_oss_midi_close(dp, i);
304 * open all midi devices. ignore errors.
307 snd_seq_oss_midi_open_all(struct seq_oss_devinfo *dp, int file_mode)
310 for (i = 0; i < dp->max_mididev; i++)
311 snd_seq_oss_midi_open(dp, i, file_mode);
316 * get the midi device information
318 static struct seq_oss_midi *
319 get_mididev(struct seq_oss_devinfo *dp, int dev)
321 if (dev < 0 || dev >= dp->max_mididev)
323 dev = array_index_nospec(dev, dp->max_mididev);
324 return get_mdev(dev);
329 * open the midi device if not opened yet
332 snd_seq_oss_midi_open(struct seq_oss_devinfo *dp, int dev, int fmode)
335 struct seq_oss_midi *mdev;
336 struct snd_seq_port_subscribe subs;
339 if ((mdev = get_mididev(dp, dev)) == NULL)
342 mutex_lock(&mdev->open_mutex);
344 if (mdev->opened && mdev->devinfo != dp) {
350 if (is_write_mode(fmode))
352 if (is_read_mode(fmode))
360 /* already opened? */
361 if ((mdev->opened & perm) == perm) {
366 perm &= ~mdev->opened;
368 memset(&subs, 0, sizeof(subs));
370 if (perm & PERM_WRITE) {
371 subs.sender = dp->addr;
372 subs.dest.client = mdev->client;
373 subs.dest.port = mdev->port;
374 if (snd_seq_kernel_client_ctl(dp->cseq, SNDRV_SEQ_IOCTL_SUBSCRIBE_PORT, &subs) >= 0)
375 mdev->opened |= PERM_WRITE;
377 if (perm & PERM_READ) {
378 subs.sender.client = mdev->client;
379 subs.sender.port = mdev->port;
380 subs.dest = dp->addr;
381 subs.flags = SNDRV_SEQ_PORT_SUBS_TIMESTAMP;
382 subs.queue = dp->queue; /* queue for timestamps */
383 if (snd_seq_kernel_client_ctl(dp->cseq, SNDRV_SEQ_IOCTL_SUBSCRIBE_PORT, &subs) >= 0)
384 mdev->opened |= PERM_READ;
387 if (! mdev->opened) {
396 mutex_unlock(&mdev->open_mutex);
397 snd_use_lock_free(&mdev->use_lock);
402 * close the midi device if already opened
405 snd_seq_oss_midi_close(struct seq_oss_devinfo *dp, int dev)
407 struct seq_oss_midi *mdev;
408 struct snd_seq_port_subscribe subs;
410 if ((mdev = get_mididev(dp, dev)) == NULL)
412 mutex_lock(&mdev->open_mutex);
413 if (!mdev->opened || mdev->devinfo != dp)
416 memset(&subs, 0, sizeof(subs));
417 if (mdev->opened & PERM_WRITE) {
418 subs.sender = dp->addr;
419 subs.dest.client = mdev->client;
420 subs.dest.port = mdev->port;
421 snd_seq_kernel_client_ctl(dp->cseq, SNDRV_SEQ_IOCTL_UNSUBSCRIBE_PORT, &subs);
423 if (mdev->opened & PERM_READ) {
424 subs.sender.client = mdev->client;
425 subs.sender.port = mdev->port;
426 subs.dest = dp->addr;
427 snd_seq_kernel_client_ctl(dp->cseq, SNDRV_SEQ_IOCTL_UNSUBSCRIBE_PORT, &subs);
431 mdev->devinfo = NULL;
434 mutex_unlock(&mdev->open_mutex);
435 snd_use_lock_free(&mdev->use_lock);
440 * change seq capability flags to file mode flags
443 snd_seq_oss_midi_filemode(struct seq_oss_devinfo *dp, int dev)
445 struct seq_oss_midi *mdev;
448 if ((mdev = get_mididev(dp, dev)) == NULL)
452 if (mdev->opened & PERM_WRITE)
453 mode |= SNDRV_SEQ_OSS_FILE_WRITE;
454 if (mdev->opened & PERM_READ)
455 mode |= SNDRV_SEQ_OSS_FILE_READ;
457 snd_use_lock_free(&mdev->use_lock);
462 * reset the midi device and close it:
463 * so far, only close the device.
466 snd_seq_oss_midi_reset(struct seq_oss_devinfo *dp, int dev)
468 struct seq_oss_midi *mdev;
470 if ((mdev = get_mididev(dp, dev)) == NULL)
472 if (! mdev->opened) {
473 snd_use_lock_free(&mdev->use_lock);
477 if (mdev->opened & PERM_WRITE) {
478 struct snd_seq_event ev;
481 memset(&ev, 0, sizeof(ev));
482 ev.dest.client = mdev->client;
483 ev.dest.port = mdev->port;
484 ev.queue = dp->queue;
485 ev.source.port = dp->port;
486 if (dp->seq_mode == SNDRV_SEQ_OSS_MODE_SYNTH) {
487 ev.type = SNDRV_SEQ_EVENT_SENSING;
488 snd_seq_oss_dispatch(dp, &ev, 0, 0);
490 for (c = 0; c < 16; c++) {
491 ev.type = SNDRV_SEQ_EVENT_CONTROLLER;
492 ev.data.control.channel = c;
493 ev.data.control.param = MIDI_CTL_ALL_NOTES_OFF;
494 snd_seq_oss_dispatch(dp, &ev, 0, 0);
495 if (dp->seq_mode == SNDRV_SEQ_OSS_MODE_MUSIC) {
496 ev.data.control.param =
497 MIDI_CTL_RESET_CONTROLLERS;
498 snd_seq_oss_dispatch(dp, &ev, 0, 0);
499 ev.type = SNDRV_SEQ_EVENT_PITCHBEND;
500 ev.data.control.value = 0;
501 snd_seq_oss_dispatch(dp, &ev, 0, 0);
505 // snd_seq_oss_midi_close(dp, dev);
506 snd_use_lock_free(&mdev->use_lock);
511 * get client/port of the specified MIDI device
514 snd_seq_oss_midi_get_addr(struct seq_oss_devinfo *dp, int dev, struct snd_seq_addr *addr)
516 struct seq_oss_midi *mdev;
518 if ((mdev = get_mididev(dp, dev)) == NULL)
520 addr->client = mdev->client;
521 addr->port = mdev->port;
522 snd_use_lock_free(&mdev->use_lock);
527 * input callback - this can be atomic
530 snd_seq_oss_midi_input(struct snd_seq_event *ev, int direct, void *private_data)
532 struct seq_oss_devinfo *dp = (struct seq_oss_devinfo *)private_data;
533 struct seq_oss_midi *mdev;
536 if (dp->readq == NULL)
538 if ((mdev = find_slot(ev->source.client, ev->source.port)) == NULL)
540 if (! (mdev->opened & PERM_READ)) {
541 snd_use_lock_free(&mdev->use_lock);
545 if (dp->seq_mode == SNDRV_SEQ_OSS_MODE_MUSIC)
546 rc = send_synth_event(dp, ev, mdev->seq_device);
548 rc = send_midi_event(dp, ev, mdev);
550 snd_use_lock_free(&mdev->use_lock);
555 * convert ALSA sequencer event to OSS synth event
558 send_synth_event(struct seq_oss_devinfo *dp, struct snd_seq_event *ev, int dev)
562 memset(&ossev, 0, sizeof(ossev));
565 case SNDRV_SEQ_EVENT_NOTEON:
566 ossev.v.cmd = MIDI_NOTEON; break;
567 case SNDRV_SEQ_EVENT_NOTEOFF:
568 ossev.v.cmd = MIDI_NOTEOFF; break;
569 case SNDRV_SEQ_EVENT_KEYPRESS:
570 ossev.v.cmd = MIDI_KEY_PRESSURE; break;
571 case SNDRV_SEQ_EVENT_CONTROLLER:
572 ossev.l.cmd = MIDI_CTL_CHANGE; break;
573 case SNDRV_SEQ_EVENT_PGMCHANGE:
574 ossev.l.cmd = MIDI_PGM_CHANGE; break;
575 case SNDRV_SEQ_EVENT_CHANPRESS:
576 ossev.l.cmd = MIDI_CHN_PRESSURE; break;
577 case SNDRV_SEQ_EVENT_PITCHBEND:
578 ossev.l.cmd = MIDI_PITCH_BEND; break;
580 return 0; /* not supported */
586 case SNDRV_SEQ_EVENT_NOTEON:
587 case SNDRV_SEQ_EVENT_NOTEOFF:
588 case SNDRV_SEQ_EVENT_KEYPRESS:
589 ossev.v.code = EV_CHN_VOICE;
590 ossev.v.note = ev->data.note.note;
591 ossev.v.parm = ev->data.note.velocity;
592 ossev.v.chn = ev->data.note.channel;
594 case SNDRV_SEQ_EVENT_CONTROLLER:
595 case SNDRV_SEQ_EVENT_PGMCHANGE:
596 case SNDRV_SEQ_EVENT_CHANPRESS:
597 ossev.l.code = EV_CHN_COMMON;
598 ossev.l.p1 = ev->data.control.param;
599 ossev.l.val = ev->data.control.value;
600 ossev.l.chn = ev->data.control.channel;
602 case SNDRV_SEQ_EVENT_PITCHBEND:
603 ossev.l.code = EV_CHN_COMMON;
604 ossev.l.val = ev->data.control.value + 8192;
605 ossev.l.chn = ev->data.control.channel;
609 snd_seq_oss_readq_put_timestamp(dp->readq, ev->time.tick, dp->seq_mode);
610 snd_seq_oss_readq_put_event(dp->readq, &ossev);
616 * decode event and send MIDI bytes to read queue
619 send_midi_event(struct seq_oss_devinfo *dp, struct snd_seq_event *ev, struct seq_oss_midi *mdev)
624 snd_seq_oss_readq_put_timestamp(dp->readq, ev->time.tick, dp->seq_mode);
625 if (!dp->timer->running)
626 len = snd_seq_oss_timer_start(dp->timer);
627 if (ev->type == SNDRV_SEQ_EVENT_SYSEX) {
628 snd_seq_oss_readq_sysex(dp->readq, mdev->seq_device, ev);
629 snd_midi_event_reset_decode(mdev->coder);
631 len = snd_midi_event_decode(mdev->coder, msg, sizeof(msg), ev);
633 snd_seq_oss_readq_puts(dp->readq, mdev->seq_device, msg, len);
642 * return 0 : enqueued
643 * non-zero : invalid - ignored
646 snd_seq_oss_midi_putc(struct seq_oss_devinfo *dp, int dev, unsigned char c, struct snd_seq_event *ev)
648 struct seq_oss_midi *mdev;
650 if ((mdev = get_mididev(dp, dev)) == NULL)
652 if (snd_midi_event_encode_byte(mdev->coder, c, ev) > 0) {
653 snd_seq_oss_fill_addr(dp, ev, mdev->client, mdev->port);
654 snd_use_lock_free(&mdev->use_lock);
657 snd_use_lock_free(&mdev->use_lock);
662 * create OSS compatible midi_info record
665 snd_seq_oss_midi_make_info(struct seq_oss_devinfo *dp, int dev, struct midi_info *inf)
667 struct seq_oss_midi *mdev;
669 if ((mdev = get_mididev(dp, dev)) == NULL)
672 inf->dev_type = 0; /* FIXME: ?? */
673 inf->capabilities = 0; /* FIXME: ?? */
674 strlcpy(inf->name, mdev->name, sizeof(inf->name));
675 snd_use_lock_free(&mdev->use_lock);
680 #ifdef CONFIG_SND_PROC_FS
687 val &= PERM_READ|PERM_WRITE;
688 if (val == (PERM_READ|PERM_WRITE))
690 else if (val == PERM_READ)
692 else if (val == PERM_WRITE)
699 snd_seq_oss_midi_info_read(struct snd_info_buffer *buf)
702 struct seq_oss_midi *mdev;
704 snd_iprintf(buf, "\nNumber of MIDI devices: %d\n", max_midi_devs);
705 for (i = 0; i < max_midi_devs; i++) {
706 snd_iprintf(buf, "\nmidi %d: ", i);
709 snd_iprintf(buf, "*empty*\n");
712 snd_iprintf(buf, "[%s] ALSA port %d:%d\n", mdev->name,
713 mdev->client, mdev->port);
714 snd_iprintf(buf, " capability %s / opened %s\n",
715 capmode_str(mdev->flags),
716 capmode_str(mdev->opened));
717 snd_use_lock_free(&mdev->use_lock);
720 #endif /* CONFIG_SND_PROC_FS */