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Linux/sound/core/seq/oss/seq_oss_synth.c

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  1 /*
  2  * OSS compatible sequencer driver
  3  *
  4  * synth device handlers
  5  *
  6  * Copyright (C) 1998,99 Takashi Iwai <tiwai@suse.de>
  7  *
  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.
 12  *
 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.
 17  *
 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
 21  */
 22 
 23 #include "seq_oss_synth.h"
 24 #include "seq_oss_midi.h"
 25 #include "../seq_lock.h"
 26 #include <linux/init.h>
 27 #include <linux/module.h>
 28 #include <linux/slab.h>
 29 #include <linux/nospec.h>
 30 
 31 /*
 32  * constants
 33  */
 34 #define SNDRV_SEQ_OSS_MAX_SYNTH_NAME    30
 35 #define MAX_SYSEX_BUFLEN                128
 36 
 37 
 38 /*
 39  * definition of synth info records
 40  */
 41 
 42 /* sysex buffer */
 43 struct seq_oss_synth_sysex {
 44         int len;
 45         int skip;
 46         unsigned char buf[MAX_SYSEX_BUFLEN];
 47 };
 48 
 49 /* synth info */
 50 struct seq_oss_synth {
 51         int seq_device;
 52 
 53         /* for synth_info */
 54         int synth_type;
 55         int synth_subtype;
 56         int nr_voices;
 57 
 58         char name[SNDRV_SEQ_OSS_MAX_SYNTH_NAME];
 59         struct snd_seq_oss_callback oper;
 60 
 61         int opened;
 62 
 63         void *private_data;
 64         snd_use_lock_t use_lock;
 65 };
 66 
 67 
 68 /*
 69  * device table
 70  */
 71 static int max_synth_devs;
 72 static struct seq_oss_synth *synth_devs[SNDRV_SEQ_OSS_MAX_SYNTH_DEVS];
 73 static struct seq_oss_synth midi_synth_dev = {
 74         -1, /* seq_device */
 75         SYNTH_TYPE_MIDI, /* synth_type */
 76         0, /* synth_subtype */
 77         16, /* nr_voices */
 78         "MIDI", /* name */
 79 };
 80 
 81 static DEFINE_SPINLOCK(register_lock);
 82 
 83 /*
 84  * prototypes
 85  */
 86 static struct seq_oss_synth *get_synthdev(struct seq_oss_devinfo *dp, int dev);
 87 static void reset_channels(struct seq_oss_synthinfo *info);
 88 
 89 /*
 90  * global initialization
 91  */
 92 void __init
 93 snd_seq_oss_synth_init(void)
 94 {
 95         snd_use_lock_init(&midi_synth_dev.use_lock);
 96 }
 97 
 98 /*
 99  * registration of the synth device
100  */
101 int
102 snd_seq_oss_synth_register(struct snd_seq_device *dev)
103 {
104         int i;
105         struct seq_oss_synth *rec;
106         struct snd_seq_oss_reg *reg = SNDRV_SEQ_DEVICE_ARGPTR(dev);
107         unsigned long flags;
108 
109         if ((rec = kzalloc(sizeof(*rec), GFP_KERNEL)) == NULL) {
110                 pr_err("ALSA: seq_oss: can't malloc synth info\n");
111                 return -ENOMEM;
112         }
113         rec->seq_device = -1;
114         rec->synth_type = reg->type;
115         rec->synth_subtype = reg->subtype;
116         rec->nr_voices = reg->nvoices;
117         rec->oper = reg->oper;
118         rec->private_data = reg->private_data;
119         rec->opened = 0;
120         snd_use_lock_init(&rec->use_lock);
121 
122         /* copy and truncate the name of synth device */
123         strlcpy(rec->name, dev->name, sizeof(rec->name));
124 
125         /* registration */
126         spin_lock_irqsave(&register_lock, flags);
127         for (i = 0; i < max_synth_devs; i++) {
128                 if (synth_devs[i] == NULL)
129                         break;
130         }
131         if (i >= max_synth_devs) {
132                 if (max_synth_devs >= SNDRV_SEQ_OSS_MAX_SYNTH_DEVS) {
133                         spin_unlock_irqrestore(&register_lock, flags);
134                         pr_err("ALSA: seq_oss: no more synth slot\n");
135                         kfree(rec);
136                         return -ENOMEM;
137                 }
138                 max_synth_devs++;
139         }
140         rec->seq_device = i;
141         synth_devs[i] = rec;
142         spin_unlock_irqrestore(&register_lock, flags);
143         dev->driver_data = rec;
144 #ifdef SNDRV_OSS_INFO_DEV_SYNTH
145         if (i < SNDRV_CARDS)
146                 snd_oss_info_register(SNDRV_OSS_INFO_DEV_SYNTH, i, rec->name);
147 #endif
148         return 0;
149 }
150 
151 
152 int
153 snd_seq_oss_synth_unregister(struct snd_seq_device *dev)
154 {
155         int index;
156         struct seq_oss_synth *rec = dev->driver_data;
157         unsigned long flags;
158 
159         spin_lock_irqsave(&register_lock, flags);
160         for (index = 0; index < max_synth_devs; index++) {
161                 if (synth_devs[index] == rec)
162                         break;
163         }
164         if (index >= max_synth_devs) {
165                 spin_unlock_irqrestore(&register_lock, flags);
166                 pr_err("ALSA: seq_oss: can't unregister synth\n");
167                 return -EINVAL;
168         }
169         synth_devs[index] = NULL;
170         if (index == max_synth_devs - 1) {
171                 for (index--; index >= 0; index--) {
172                         if (synth_devs[index])
173                                 break;
174                 }
175                 max_synth_devs = index + 1;
176         }
177         spin_unlock_irqrestore(&register_lock, flags);
178 #ifdef SNDRV_OSS_INFO_DEV_SYNTH
179         if (rec->seq_device < SNDRV_CARDS)
180                 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_SYNTH, rec->seq_device);
181 #endif
182 
183         snd_use_lock_sync(&rec->use_lock);
184         kfree(rec);
185 
186         return 0;
187 }
188 
189 
190 /*
191  */
192 static struct seq_oss_synth *
193 get_sdev(int dev)
194 {
195         struct seq_oss_synth *rec;
196         unsigned long flags;
197 
198         spin_lock_irqsave(&register_lock, flags);
199         rec = synth_devs[dev];
200         if (rec)
201                 snd_use_lock_use(&rec->use_lock);
202         spin_unlock_irqrestore(&register_lock, flags);
203         return rec;
204 }
205 
206 
207 /*
208  * set up synth tables
209  */
210 
211 void
212 snd_seq_oss_synth_setup(struct seq_oss_devinfo *dp)
213 {
214         int i;
215         struct seq_oss_synth *rec;
216         struct seq_oss_synthinfo *info;
217 
218         dp->max_synthdev = max_synth_devs;
219         dp->synth_opened = 0;
220         memset(dp->synths, 0, sizeof(dp->synths));
221         for (i = 0; i < dp->max_synthdev; i++) {
222                 rec = get_sdev(i);
223                 if (rec == NULL)
224                         continue;
225                 if (rec->oper.open == NULL || rec->oper.close == NULL) {
226                         snd_use_lock_free(&rec->use_lock);
227                         continue;
228                 }
229                 info = &dp->synths[i];
230                 info->arg.app_index = dp->port;
231                 info->arg.file_mode = dp->file_mode;
232                 info->arg.seq_mode = dp->seq_mode;
233                 if (dp->seq_mode == SNDRV_SEQ_OSS_MODE_SYNTH)
234                         info->arg.event_passing = SNDRV_SEQ_OSS_PROCESS_EVENTS;
235                 else
236                         info->arg.event_passing = SNDRV_SEQ_OSS_PASS_EVENTS;
237                 info->opened = 0;
238                 if (!try_module_get(rec->oper.owner)) {
239                         snd_use_lock_free(&rec->use_lock);
240                         continue;
241                 }
242                 if (rec->oper.open(&info->arg, rec->private_data) < 0) {
243                         module_put(rec->oper.owner);
244                         snd_use_lock_free(&rec->use_lock);
245                         continue;
246                 }
247                 info->nr_voices = rec->nr_voices;
248                 if (info->nr_voices > 0) {
249                         info->ch = kcalloc(info->nr_voices, sizeof(struct seq_oss_chinfo), GFP_KERNEL);
250                         if (!info->ch) {
251                                 pr_err("ALSA: seq_oss: Cannot malloc voices\n");
252                                 rec->oper.close(&info->arg);
253                                 module_put(rec->oper.owner);
254                                 snd_use_lock_free(&rec->use_lock);
255                                 continue;
256                         }
257                         reset_channels(info);
258                 }
259                 info->opened++;
260                 rec->opened++;
261                 dp->synth_opened++;
262                 snd_use_lock_free(&rec->use_lock);
263         }
264 }
265 
266 
267 /*
268  * set up synth tables for MIDI emulation - /dev/music mode only
269  */
270 
271 void
272 snd_seq_oss_synth_setup_midi(struct seq_oss_devinfo *dp)
273 {
274         int i;
275 
276         if (dp->max_synthdev >= SNDRV_SEQ_OSS_MAX_SYNTH_DEVS)
277                 return;
278 
279         for (i = 0; i < dp->max_mididev; i++) {
280                 struct seq_oss_synthinfo *info;
281                 info = &dp->synths[dp->max_synthdev];
282                 if (snd_seq_oss_midi_open(dp, i, dp->file_mode) < 0)
283                         continue;
284                 info->arg.app_index = dp->port;
285                 info->arg.file_mode = dp->file_mode;
286                 info->arg.seq_mode = dp->seq_mode;
287                 info->arg.private_data = info;
288                 info->is_midi = 1;
289                 info->midi_mapped = i;
290                 info->arg.event_passing = SNDRV_SEQ_OSS_PASS_EVENTS;
291                 snd_seq_oss_midi_get_addr(dp, i, &info->arg.addr);
292                 info->opened = 1;
293                 midi_synth_dev.opened++;
294                 dp->max_synthdev++;
295                 if (dp->max_synthdev >= SNDRV_SEQ_OSS_MAX_SYNTH_DEVS)
296                         break;
297         }
298 }
299 
300 
301 /*
302  * clean up synth tables
303  */
304 
305 void
306 snd_seq_oss_synth_cleanup(struct seq_oss_devinfo *dp)
307 {
308         int i;
309         struct seq_oss_synth *rec;
310         struct seq_oss_synthinfo *info;
311 
312         if (snd_BUG_ON(dp->max_synthdev > SNDRV_SEQ_OSS_MAX_SYNTH_DEVS))
313                 return;
314         for (i = 0; i < dp->max_synthdev; i++) {
315                 info = &dp->synths[i];
316                 if (! info->opened)
317                         continue;
318                 if (info->is_midi) {
319                         if (midi_synth_dev.opened > 0) {
320                                 snd_seq_oss_midi_close(dp, info->midi_mapped);
321                                 midi_synth_dev.opened--;
322                         }
323                 } else {
324                         rec = get_sdev(i);
325                         if (rec == NULL)
326                                 continue;
327                         if (rec->opened > 0) {
328                                 rec->oper.close(&info->arg);
329                                 module_put(rec->oper.owner);
330                                 rec->opened = 0;
331                         }
332                         snd_use_lock_free(&rec->use_lock);
333                 }
334                 kfree(info->sysex);
335                 info->sysex = NULL;
336                 kfree(info->ch);
337                 info->ch = NULL;
338         }
339         dp->synth_opened = 0;
340         dp->max_synthdev = 0;
341 }
342 
343 static struct seq_oss_synthinfo *
344 get_synthinfo_nospec(struct seq_oss_devinfo *dp, int dev)
345 {
346         if (dev < 0 || dev >= dp->max_synthdev)
347                 return NULL;
348         dev = array_index_nospec(dev, SNDRV_SEQ_OSS_MAX_SYNTH_DEVS);
349         return &dp->synths[dev];
350 }
351 
352 /*
353  * return synth device information pointer
354  */
355 static struct seq_oss_synth *
356 get_synthdev(struct seq_oss_devinfo *dp, int dev)
357 {
358         struct seq_oss_synth *rec;
359         struct seq_oss_synthinfo *info = get_synthinfo_nospec(dp, dev);
360 
361         if (!info)
362                 return NULL;
363         if (!info->opened)
364                 return NULL;
365         if (info->is_midi) {
366                 rec = &midi_synth_dev;
367                 snd_use_lock_use(&rec->use_lock);
368         } else {
369                 rec = get_sdev(dev);
370                 if (!rec)
371                         return NULL;
372         }
373         if (! rec->opened) {
374                 snd_use_lock_free(&rec->use_lock);
375                 return NULL;
376         }
377         return rec;
378 }
379 
380 
381 /*
382  * reset note and velocity on each channel.
383  */
384 static void
385 reset_channels(struct seq_oss_synthinfo *info)
386 {
387         int i;
388         if (info->ch == NULL || ! info->nr_voices)
389                 return;
390         for (i = 0; i < info->nr_voices; i++) {
391                 info->ch[i].note = -1;
392                 info->ch[i].vel = 0;
393         }
394 }
395 
396 
397 /*
398  * reset synth device:
399  * call reset callback.  if no callback is defined, send a heartbeat
400  * event to the corresponding port.
401  */
402 void
403 snd_seq_oss_synth_reset(struct seq_oss_devinfo *dp, int dev)
404 {
405         struct seq_oss_synth *rec;
406         struct seq_oss_synthinfo *info;
407 
408         info = get_synthinfo_nospec(dp, dev);
409         if (!info || !info->opened)
410                 return;
411         if (info->sysex)
412                 info->sysex->len = 0; /* reset sysex */
413         reset_channels(info);
414         if (info->is_midi) {
415                 if (midi_synth_dev.opened <= 0)
416                         return;
417                 snd_seq_oss_midi_reset(dp, info->midi_mapped);
418                 /* reopen the device */
419                 snd_seq_oss_midi_close(dp, dev);
420                 if (snd_seq_oss_midi_open(dp, info->midi_mapped,
421                                           dp->file_mode) < 0) {
422                         midi_synth_dev.opened--;
423                         info->opened = 0;
424                         kfree(info->sysex);
425                         info->sysex = NULL;
426                         kfree(info->ch);
427                         info->ch = NULL;
428                 }
429                 return;
430         }
431 
432         rec = get_sdev(dev);
433         if (rec == NULL)
434                 return;
435         if (rec->oper.reset) {
436                 rec->oper.reset(&info->arg);
437         } else {
438                 struct snd_seq_event ev;
439                 memset(&ev, 0, sizeof(ev));
440                 snd_seq_oss_fill_addr(dp, &ev, info->arg.addr.client,
441                                       info->arg.addr.port);
442                 ev.type = SNDRV_SEQ_EVENT_RESET;
443                 snd_seq_oss_dispatch(dp, &ev, 0, 0);
444         }
445         snd_use_lock_free(&rec->use_lock);
446 }
447 
448 
449 /*
450  * load a patch record:
451  * call load_patch callback function
452  */
453 int
454 snd_seq_oss_synth_load_patch(struct seq_oss_devinfo *dp, int dev, int fmt,
455                             const char __user *buf, int p, int c)
456 {
457         struct seq_oss_synth *rec;
458         struct seq_oss_synthinfo *info;
459         int rc;
460 
461         info = get_synthinfo_nospec(dp, dev);
462         if (!info)
463                 return -ENXIO;
464 
465         if (info->is_midi)
466                 return 0;
467         if ((rec = get_synthdev(dp, dev)) == NULL)
468                 return -ENXIO;
469 
470         if (rec->oper.load_patch == NULL)
471                 rc = -ENXIO;
472         else
473                 rc = rec->oper.load_patch(&info->arg, fmt, buf, p, c);
474         snd_use_lock_free(&rec->use_lock);
475         return rc;
476 }
477 
478 /*
479  * check if the device is valid synth device and return the synth info
480  */
481 struct seq_oss_synthinfo *
482 snd_seq_oss_synth_info(struct seq_oss_devinfo *dp, int dev)
483 {
484         struct seq_oss_synth *rec;
485 
486         rec = get_synthdev(dp, dev);
487         if (rec) {
488                 snd_use_lock_free(&rec->use_lock);
489                 return get_synthinfo_nospec(dp, dev);
490         }
491         return NULL;
492 }
493 
494 
495 /*
496  * receive OSS 6 byte sysex packet:
497  * the full sysex message will be sent if it reaches to the end of data
498  * (0xff).
499  */
500 int
501 snd_seq_oss_synth_sysex(struct seq_oss_devinfo *dp, int dev, unsigned char *buf, struct snd_seq_event *ev)
502 {
503         int i, send;
504         unsigned char *dest;
505         struct seq_oss_synth_sysex *sysex;
506         struct seq_oss_synthinfo *info;
507 
508         info = snd_seq_oss_synth_info(dp, dev);
509         if (!info)
510                 return -ENXIO;
511 
512         sysex = info->sysex;
513         if (sysex == NULL) {
514                 sysex = kzalloc(sizeof(*sysex), GFP_KERNEL);
515                 if (sysex == NULL)
516                         return -ENOMEM;
517                 info->sysex = sysex;
518         }
519 
520         send = 0;
521         dest = sysex->buf + sysex->len;
522         /* copy 6 byte packet to the buffer */
523         for (i = 0; i < 6; i++) {
524                 if (buf[i] == 0xff) {
525                         send = 1;
526                         break;
527                 }
528                 dest[i] = buf[i];
529                 sysex->len++;
530                 if (sysex->len >= MAX_SYSEX_BUFLEN) {
531                         sysex->len = 0;
532                         sysex->skip = 1;
533                         break;
534                 }
535         }
536 
537         if (sysex->len && send) {
538                 if (sysex->skip) {
539                         sysex->skip = 0;
540                         sysex->len = 0;
541                         return -EINVAL; /* skip */
542                 }
543                 /* copy the data to event record and send it */
544                 ev->flags = SNDRV_SEQ_EVENT_LENGTH_VARIABLE;
545                 if (snd_seq_oss_synth_addr(dp, dev, ev))
546                         return -EINVAL;
547                 ev->data.ext.len = sysex->len;
548                 ev->data.ext.ptr = sysex->buf;
549                 sysex->len = 0;
550                 return 0;
551         }
552 
553         return -EINVAL; /* skip */
554 }
555 
556 /*
557  * fill the event source/destination addresses
558  */
559 int
560 snd_seq_oss_synth_addr(struct seq_oss_devinfo *dp, int dev, struct snd_seq_event *ev)
561 {
562         struct seq_oss_synthinfo *info = snd_seq_oss_synth_info(dp, dev);
563 
564         if (!info)
565                 return -EINVAL;
566         snd_seq_oss_fill_addr(dp, ev, info->arg.addr.client,
567                               info->arg.addr.port);
568         return 0;
569 }
570 
571 
572 /*
573  * OSS compatible ioctl
574  */
575 int
576 snd_seq_oss_synth_ioctl(struct seq_oss_devinfo *dp, int dev, unsigned int cmd, unsigned long addr)
577 {
578         struct seq_oss_synth *rec;
579         struct seq_oss_synthinfo *info;
580         int rc;
581 
582         info = get_synthinfo_nospec(dp, dev);
583         if (!info || info->is_midi)
584                 return -ENXIO;
585         if ((rec = get_synthdev(dp, dev)) == NULL)
586                 return -ENXIO;
587         if (rec->oper.ioctl == NULL)
588                 rc = -ENXIO;
589         else
590                 rc = rec->oper.ioctl(&info->arg, cmd, addr);
591         snd_use_lock_free(&rec->use_lock);
592         return rc;
593 }
594 
595 
596 /*
597  * send OSS raw events - SEQ_PRIVATE and SEQ_VOLUME
598  */
599 int
600 snd_seq_oss_synth_raw_event(struct seq_oss_devinfo *dp, int dev, unsigned char *data, struct snd_seq_event *ev)
601 {
602         struct seq_oss_synthinfo *info;
603 
604         info = snd_seq_oss_synth_info(dp, dev);
605         if (!info || info->is_midi)
606                 return -ENXIO;
607         ev->type = SNDRV_SEQ_EVENT_OSS;
608         memcpy(ev->data.raw8.d, data, 8);
609         return snd_seq_oss_synth_addr(dp, dev, ev);
610 }
611 
612 
613 /*
614  * create OSS compatible synth_info record
615  */
616 int
617 snd_seq_oss_synth_make_info(struct seq_oss_devinfo *dp, int dev, struct synth_info *inf)
618 {
619         struct seq_oss_synth *rec;
620         struct seq_oss_synthinfo *info = get_synthinfo_nospec(dp, dev);
621 
622         if (!info)
623                 return -ENXIO;
624 
625         if (info->is_midi) {
626                 struct midi_info minf;
627                 snd_seq_oss_midi_make_info(dp, info->midi_mapped, &minf);
628                 inf->synth_type = SYNTH_TYPE_MIDI;
629                 inf->synth_subtype = 0;
630                 inf->nr_voices = 16;
631                 inf->device = dev;
632                 strlcpy(inf->name, minf.name, sizeof(inf->name));
633         } else {
634                 if ((rec = get_synthdev(dp, dev)) == NULL)
635                         return -ENXIO;
636                 inf->synth_type = rec->synth_type;
637                 inf->synth_subtype = rec->synth_subtype;
638                 inf->nr_voices = rec->nr_voices;
639                 inf->device = dev;
640                 strlcpy(inf->name, rec->name, sizeof(inf->name));
641                 snd_use_lock_free(&rec->use_lock);
642         }
643         return 0;
644 }
645 
646 
647 #ifdef CONFIG_PROC_FS
648 /*
649  * proc interface
650  */
651 void
652 snd_seq_oss_synth_info_read(struct snd_info_buffer *buf)
653 {
654         int i;
655         struct seq_oss_synth *rec;
656 
657         snd_iprintf(buf, "\nNumber of synth devices: %d\n", max_synth_devs);
658         for (i = 0; i < max_synth_devs; i++) {
659                 snd_iprintf(buf, "\nsynth %d: ", i);
660                 rec = get_sdev(i);
661                 if (rec == NULL) {
662                         snd_iprintf(buf, "*empty*\n");
663                         continue;
664                 }
665                 snd_iprintf(buf, "[%s]\n", rec->name);
666                 snd_iprintf(buf, "  type 0x%x : subtype 0x%x : voices %d\n",
667                             rec->synth_type, rec->synth_subtype,
668                             rec->nr_voices);
669                 snd_iprintf(buf, "  capabilities : ioctl %s / load_patch %s\n",
670                             enabled_str((long)rec->oper.ioctl),
671                             enabled_str((long)rec->oper.load_patch));
672                 snd_use_lock_free(&rec->use_lock);
673         }
674 }
675 #endif /* CONFIG_PROC_FS */
676 

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