sound/core/seq/oss/seq_oss_midi.c

   1 /*
   2  * OSS compatible sequencer driver
   3  *
   4  * MIDI 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 <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
  33
  34 /*
  35  * constants
  36  */
  37 #define SNDRV_SEQ_OSS_MAX_MIDI_NAME     30
  38
  39 /*
  40  * definition of midi device record
  41  */
  42 struct seq_oss_midi {
  43         int seq_device;         /* device number */
  44         int client;             /* sequencer client number */
  45         int port;               /* sequencer port number */
  46         unsigned int flags;     /* port capability */
  47         int opened;             /* flag for opening */
  48         unsigned char name[SNDRV_SEQ_OSS_MAX_MIDI_NAME];
  49         struct snd_midi_event *coder;   /* MIDI event coder */
  50         struct seq_oss_devinfo *devinfo;        /* assigned OSSseq device */
  51         snd_use_lock_t use_lock;
  52 };
  53
  54
  55 /*
  56  * midi device table
  57  */
  58 static int max_midi_devs;
  59 static struct seq_oss_midi *midi_devs[SNDRV_SEQ_OSS_MAX_MIDI_DEVS];
  60
  61 static DEFINE_SPINLOCK(register_lock);
  62
  63 /*
  64  * prototypes
  65  */
  66 static struct seq_oss_midi *get_mdev(int dev);
  67 static struct seq_oss_midi *get_mididev(struct seq_oss_devinfo *dp, int dev);
  68 static int send_synth_event(struct seq_oss_devinfo *dp, struct snd_seq_event *ev, int dev);
  69 static int send_midi_event(struct seq_oss_devinfo *dp, struct snd_seq_event *ev, struct seq_oss_midi *mdev);
  70
  71 /*
  72  * look up the existing ports
  73  * this looks a very exhausting job.
  74  */
  75 int
  76 snd_seq_oss_midi_lookup_ports(int client)
  77 {
  78         struct snd_seq_client_info *clinfo;
  79         struct snd_seq_port_info *pinfo;
  80
  81         clinfo = kzalloc(sizeof(*clinfo), GFP_KERNEL);
  82         pinfo = kzalloc(sizeof(*pinfo), GFP_KERNEL);
  83         if (! clinfo || ! pinfo) {
  84                 kfree(clinfo);
  85                 kfree(pinfo);
  86                 return -ENOMEM;
  87         }
  88         clinfo->client = -1;
  89         while (snd_seq_kernel_client_ctl(client, SNDRV_SEQ_IOCTL_QUERY_NEXT_CLIENT, clinfo) == 0) {
  90                 if (clinfo->client == client)
  91                         continue; /* ignore myself */
  92                 pinfo->addr.client = clinfo->client;
  93                 pinfo->addr.port = -1;
  94                 while (snd_seq_kernel_client_ctl(client, SNDRV_SEQ_IOCTL_QUERY_NEXT_PORT, pinfo) == 0)
  95                         snd_seq_oss_midi_check_new_port(pinfo);
  96         }
  97         kfree(clinfo);
  98         kfree(pinfo);
  99         return 0;
 100 }
 101
 102
 103 /*
 104  */
 105 static struct seq_oss_midi *
 106 get_mdev(int dev)
 107 {
 108         struct seq_oss_midi *mdev;
 109         unsigned long flags;
 110
 111         spin_lock_irqsave(&register_lock, flags);
 112         mdev = midi_devs[dev];
 113         if (mdev)
 114                 snd_use_lock_use(&mdev->use_lock);
 115         spin_unlock_irqrestore(&register_lock, flags);
 116         return mdev;
 117 }
 118
 119 /*
 120  * look for the identical slot
 121  */
 122 static struct seq_oss_midi *
 123 find_slot(int client, int port)
 124 {
 125         int i;
 126         struct seq_oss_midi *mdev;
 127         unsigned long flags;
 128
 129         spin_lock_irqsave(&register_lock, flags);
 130         for (i = 0; i < max_midi_devs; i++) {
 131                 mdev = midi_devs[i];
 132                 if (mdev && mdev->client == client && mdev->port == port) {
 133                         /* found! */
 134                         snd_use_lock_use(&mdev->use_lock);
 135                         spin_unlock_irqrestore(&register_lock, flags);
 136                         return mdev;
 137                 }
 138         }
 139         spin_unlock_irqrestore(&register_lock, flags);
 140         return NULL;
 141 }
 142
 143
 144 #define PERM_WRITE (SNDRV_SEQ_PORT_CAP_WRITE|SNDRV_SEQ_PORT_CAP_SUBS_WRITE)
 145 #define PERM_READ (SNDRV_SEQ_PORT_CAP_READ|SNDRV_SEQ_PORT_CAP_SUBS_READ)
 146 /*
 147  * register a new port if it doesn't exist yet
 148  */
 149 int
 150 snd_seq_oss_midi_check_new_port(struct snd_seq_port_info *pinfo)
 151 {
 152         int i;
 153         struct seq_oss_midi *mdev;
 154         unsigned long flags;
 155
 156         /* the port must include generic midi */
 157         if (! (pinfo->type & SNDRV_SEQ_PORT_TYPE_MIDI_GENERIC))
 158                 return 0;
 159         /* either read or write subscribable */
 160         if ((pinfo->capability & PERM_WRITE) != PERM_WRITE &&
 161             (pinfo->capability & PERM_READ) != PERM_READ)
 162                 return 0;
 163
 164         /*
 165          * look for the identical slot
 166          */
 167         if ((mdev = find_slot(pinfo->addr.client, pinfo->addr.port)) != NULL) {
 168                 /* already exists */
 169                 snd_use_lock_free(&mdev->use_lock);
 170                 return 0;
 171         }
 172
 173         /*
 174          * allocate midi info record
 175          */
 176         if ((mdev = kzalloc(sizeof(*mdev), GFP_KERNEL)) == NULL) {
 177                 pr_err("ALSA: seq_oss: can't malloc midi info\n");
 178                 return -ENOMEM;
 179         }
 180
 181         /* copy the port information */
 182         mdev->client = pinfo->addr.client;
 183         mdev->port = pinfo->addr.port;
 184         mdev->flags = pinfo->capability;
 185         mdev->opened = 0;
 186         snd_use_lock_init(&mdev->use_lock);
 187
 188         /* copy and truncate the name of synth device */
 189         strlcpy(mdev->name, pinfo->name, sizeof(mdev->name));
 190
 191         /* create MIDI coder */
 192         if (snd_midi_event_new(MAX_MIDI_EVENT_BUF, &mdev->coder) < 0) {
 193                 pr_err("ALSA: seq_oss: can't malloc midi coder\n");
 194                 kfree(mdev);
 195                 return -ENOMEM;
 196         }
 197         /* OSS sequencer adds running status to all sequences */
 198         snd_midi_event_no_status(mdev->coder, 1);
 199
 200         /*
 201          * look for en empty slot
 202          */
 203         spin_lock_irqsave(&register_lock, flags);
 204         for (i = 0; i < max_midi_devs; i++) {
 205                 if (midi_devs[i] == NULL)
 206                         break;
 207         }
 208         if (i >= max_midi_devs) {
 209                 if (max_midi_devs >= SNDRV_SEQ_OSS_MAX_MIDI_DEVS) {
 210                         spin_unlock_irqrestore(&register_lock, flags);
 211                         snd_midi_event_free(mdev->coder);
 212                         kfree(mdev);
 213                         return -ENOMEM;
 214                 }
 215                 max_midi_devs++;
 216         }
 217         mdev->seq_device = i;
 218         midi_devs[mdev->seq_device] = mdev;
 219         spin_unlock_irqrestore(&register_lock, flags);
 220
 221         return 0;
 222 }
 223
 224 /*
 225  * release the midi device if it was registered
 226  */
 227 int
 228 snd_seq_oss_midi_check_exit_port(int client, int port)
 229 {
 230         struct seq_oss_midi *mdev;
 231         unsigned long flags;
 232         int index;
 233
 234         if ((mdev = find_slot(client, port)) != NULL) {
 235                 spin_lock_irqsave(&register_lock, flags);
 236                 midi_devs[mdev->seq_device] = NULL;
 237                 spin_unlock_irqrestore(&register_lock, flags);
 238                 snd_use_lock_free(&mdev->use_lock);
 239                 snd_use_lock_sync(&mdev->use_lock);
 240                 if (mdev->coder)
 241                         snd_midi_event_free(mdev->coder);
 242                 kfree(mdev);
 243         }
 244         spin_lock_irqsave(&register_lock, flags);
 245         for (index = max_midi_devs - 1; index >= 0; index--) {
 246                 if (midi_devs[index])
 247                         break;
 248         }
 249         max_midi_devs = index + 1;
 250         spin_unlock_irqrestore(&register_lock, flags);
 251         return 0;
 252 }
 253
 254
 255 /*
 256  * release the midi device if it was registered
 257  */
 258 void
 259 snd_seq_oss_midi_clear_all(void)
 260 {
 261         int i;
 262         struct seq_oss_midi *mdev;
 263         unsigned long flags;
 264
 265         spin_lock_irqsave(&register_lock, flags);
 266         for (i = 0; i < max_midi_devs; i++) {
 267                 if ((mdev = midi_devs[i]) != NULL) {
 268                         if (mdev->coder)
 269                                 snd_midi_event_free(mdev->coder);
 270                         kfree(mdev);
 271                         midi_devs[i] = NULL;
 272                 }
 273         }
 274         max_midi_devs = 0;
 275         spin_unlock_irqrestore(&register_lock, flags);
 276 }
 277
 278
 279 /*
 280  * set up midi tables
 281  */
 282 void
 283 snd_seq_oss_midi_setup(struct seq_oss_devinfo *dp)
 284 {
 285         dp->max_mididev = max_midi_devs;
 286 }
 287
 288 /*
 289  * clean up midi tables
 290  */
 291 void
 292 snd_seq_oss_midi_cleanup(struct seq_oss_devinfo *dp)
 293 {
 294         int i;
 295         for (i = 0; i < dp->max_mididev; i++)
 296                 snd_seq_oss_midi_close(dp, i);
 297         dp->max_mididev = 0;
 298 }
 299
 300
 301 /*
 302  * open all midi devices.  ignore errors.
 303  */
 304 void
 305 snd_seq_oss_midi_open_all(struct seq_oss_devinfo *dp, int file_mode)
 306 {
 307         int i;
 308         for (i = 0; i < dp->max_mididev; i++)
 309                 snd_seq_oss_midi_open(dp, i, file_mode);
 310 }
 311
 312
 313 /*
 314  * get the midi device information
 315  */
 316 static struct seq_oss_midi *
 317 get_mididev(struct seq_oss_devinfo *dp, int dev)
 318 {
 319         if (dev < 0 || dev >= dp->max_mididev)
 320                 return NULL;
 321         return get_mdev(dev);
 322 }
 323
 324
 325 /*
 326  * open the midi device if not opened yet
 327  */
 328 int
 329 snd_seq_oss_midi_open(struct seq_oss_devinfo *dp, int dev, int fmode)
 330 {
 331         int perm;
 332         struct seq_oss_midi *mdev;
 333         struct snd_seq_port_subscribe subs;
 334
 335         if ((mdev = get_mididev(dp, dev)) == NULL)
 336                 return -ENODEV;
 337
 338         /* already used? */
 339         if (mdev->opened && mdev->devinfo != dp) {
 340                 snd_use_lock_free(&mdev->use_lock);
 341                 return -EBUSY;
 342         }
 343
 344         perm = 0;
 345         if (is_write_mode(fmode))
 346                 perm |= PERM_WRITE;
 347         if (is_read_mode(fmode))
 348                 perm |= PERM_READ;
 349         perm &= mdev->flags;
 350         if (perm == 0) {
 351                 snd_use_lock_free(&mdev->use_lock);
 352                 return -ENXIO;
 353         }
 354
 355         /* already opened? */
 356         if ((mdev->opened & perm) == perm) {
 357                 snd_use_lock_free(&mdev->use_lock);
 358                 return 0;
 359         }
 360
 361         perm &= ~mdev->opened;
 362
 363         memset(&subs, 0, sizeof(subs));
 364
 365         if (perm & PERM_WRITE) {
 366                 subs.sender = dp->addr;
 367                 subs.dest.client = mdev->client;
 368                 subs.dest.port = mdev->port;
 369                 if (snd_seq_kernel_client_ctl(dp->cseq, SNDRV_SEQ_IOCTL_SUBSCRIBE_PORT, &subs) >= 0)
 370                         mdev->opened |= PERM_WRITE;
 371         }
 372         if (perm & PERM_READ) {
 373                 subs.sender.client = mdev->client;
 374                 subs.sender.port = mdev->port;
 375                 subs.dest = dp->addr;
 376                 subs.flags = SNDRV_SEQ_PORT_SUBS_TIMESTAMP;
 377                 subs.queue = dp->queue;         /* queue for timestamps */
 378                 if (snd_seq_kernel_client_ctl(dp->cseq, SNDRV_SEQ_IOCTL_SUBSCRIBE_PORT, &subs) >= 0)
 379                         mdev->opened |= PERM_READ;
 380         }
 381
 382         if (! mdev->opened) {
 383                 snd_use_lock_free(&mdev->use_lock);
 384                 return -ENXIO;
 385         }
 386
 387         mdev->devinfo = dp;
 388         snd_use_lock_free(&mdev->use_lock);
 389         return 0;
 390 }
 391
 392 /*
 393  * close the midi device if already opened
 394  */
 395 int
 396 snd_seq_oss_midi_close(struct seq_oss_devinfo *dp, int dev)
 397 {
 398         struct seq_oss_midi *mdev;
 399         struct snd_seq_port_subscribe subs;
 400
 401         if ((mdev = get_mididev(dp, dev)) == NULL)
 402                 return -ENODEV;
 403         if (! mdev->opened || mdev->devinfo != dp) {
 404                 snd_use_lock_free(&mdev->use_lock);
 405                 return 0;
 406         }
 407
 408         memset(&subs, 0, sizeof(subs));
 409         if (mdev->opened & PERM_WRITE) {
 410                 subs.sender = dp->addr;
 411                 subs.dest.client = mdev->client;
 412                 subs.dest.port = mdev->port;
 413                 snd_seq_kernel_client_ctl(dp->cseq, SNDRV_SEQ_IOCTL_UNSUBSCRIBE_PORT, &subs);
 414         }
 415         if (mdev->opened & PERM_READ) {
 416                 subs.sender.client = mdev->client;
 417                 subs.sender.port = mdev->port;
 418                 subs.dest = dp->addr;
 419                 snd_seq_kernel_client_ctl(dp->cseq, SNDRV_SEQ_IOCTL_UNSUBSCRIBE_PORT, &subs);
 420         }
 421
 422         mdev->opened = 0;
 423         mdev->devinfo = NULL;
 424
 425         snd_use_lock_free(&mdev->use_lock);
 426         return 0;
 427 }
 428
 429 /*
 430  * change seq capability flags to file mode flags
 431  */
 432 int
 433 snd_seq_oss_midi_filemode(struct seq_oss_devinfo *dp, int dev)
 434 {
 435         struct seq_oss_midi *mdev;
 436         int mode;
 437
 438         if ((mdev = get_mididev(dp, dev)) == NULL)
 439                 return 0;
 440
 441         mode = 0;
 442         if (mdev->opened & PERM_WRITE)
 443                 mode |= SNDRV_SEQ_OSS_FILE_WRITE;
 444         if (mdev->opened & PERM_READ)
 445                 mode |= SNDRV_SEQ_OSS_FILE_READ;
 446
 447         snd_use_lock_free(&mdev->use_lock);
 448         return mode;
 449 }
 450
 451 /*
 452  * reset the midi device and close it:
 453  * so far, only close the device.
 454  */
 455 void
 456 snd_seq_oss_midi_reset(struct seq_oss_devinfo *dp, int dev)
 457 {
 458         struct seq_oss_midi *mdev;
 459
 460         if ((mdev = get_mididev(dp, dev)) == NULL)
 461                 return;
 462         if (! mdev->opened) {
 463                 snd_use_lock_free(&mdev->use_lock);
 464                 return;
 465         }
 466
 467         if (mdev->opened & PERM_WRITE) {
 468                 struct snd_seq_event ev;
 469                 int c;
 470
 471                 memset(&ev, 0, sizeof(ev));
 472                 ev.dest.client = mdev->client;
 473                 ev.dest.port = mdev->port;
 474                 ev.queue = dp->queue;
 475                 ev.source.port = dp->port;
 476                 if (dp->seq_mode == SNDRV_SEQ_OSS_MODE_SYNTH) {
 477                         ev.type = SNDRV_SEQ_EVENT_SENSING;
 478                         snd_seq_oss_dispatch(dp, &ev, 0, 0);
 479                 }
 480                 for (c = 0; c < 16; c++) {
 481                         ev.type = SNDRV_SEQ_EVENT_CONTROLLER;
 482                         ev.data.control.channel = c;
 483                         ev.data.control.param = MIDI_CTL_ALL_NOTES_OFF;
 484                         snd_seq_oss_dispatch(dp, &ev, 0, 0);
 485                         if (dp->seq_mode == SNDRV_SEQ_OSS_MODE_MUSIC) {
 486                                 ev.data.control.param =
 487                                         MIDI_CTL_RESET_CONTROLLERS;
 488                                 snd_seq_oss_dispatch(dp, &ev, 0, 0);
 489                                 ev.type = SNDRV_SEQ_EVENT_PITCHBEND;
 490                                 ev.data.control.value = 0;
 491                                 snd_seq_oss_dispatch(dp, &ev, 0, 0);
 492                         }
 493                 }
 494         }
 495         // snd_seq_oss_midi_close(dp, dev);
 496         snd_use_lock_free(&mdev->use_lock);
 497 }
 498
 499
 500 /*
 501  * get client/port of the specified MIDI device
 502  */
 503 void
 504 snd_seq_oss_midi_get_addr(struct seq_oss_devinfo *dp, int dev, struct snd_seq_addr *addr)
 505 {
 506         struct seq_oss_midi *mdev;
 507
 508         if ((mdev = get_mididev(dp, dev)) == NULL)
 509                 return;
 510         addr->client = mdev->client;
 511         addr->port = mdev->port;
 512         snd_use_lock_free(&mdev->use_lock);
 513 }
 514
 515
 516 /*
 517  * input callback - this can be atomic
 518  */
 519 int
 520 snd_seq_oss_midi_input(struct snd_seq_event *ev, int direct, void *private_data)
 521 {
 522         struct seq_oss_devinfo *dp = (struct seq_oss_devinfo *)private_data;
 523         struct seq_oss_midi *mdev;
 524         int rc;
 525
 526         if (dp->readq == NULL)
 527                 return 0;
 528         if ((mdev = find_slot(ev->source.client, ev->source.port)) == NULL)
 529                 return 0;
 530         if (! (mdev->opened & PERM_READ)) {
 531                 snd_use_lock_free(&mdev->use_lock);
 532                 return 0;
 533         }
 534
 535         if (dp->seq_mode == SNDRV_SEQ_OSS_MODE_MUSIC)
 536                 rc = send_synth_event(dp, ev, mdev->seq_device);
 537         else
 538                 rc = send_midi_event(dp, ev, mdev);
 539
 540         snd_use_lock_free(&mdev->use_lock);
 541         return rc;
 542 }
 543
 544 /*
 545  * convert ALSA sequencer event to OSS synth event
 546  */
 547 static int
 548 send_synth_event(struct seq_oss_devinfo *dp, struct snd_seq_event *ev, int dev)
 549 {
 550         union evrec ossev;
 551
 552         memset(&ossev, 0, sizeof(ossev));
 553
 554         switch (ev->type) {
 555         case SNDRV_SEQ_EVENT_NOTEON:
 556                 ossev.v.cmd = MIDI_NOTEON; break;
 557         case SNDRV_SEQ_EVENT_NOTEOFF:
 558                 ossev.v.cmd = MIDI_NOTEOFF; break;
 559         case SNDRV_SEQ_EVENT_KEYPRESS:
 560                 ossev.v.cmd = MIDI_KEY_PRESSURE; break;
 561         case SNDRV_SEQ_EVENT_CONTROLLER:
 562                 ossev.l.cmd = MIDI_CTL_CHANGE; break;
 563         case SNDRV_SEQ_EVENT_PGMCHANGE:
 564                 ossev.l.cmd = MIDI_PGM_CHANGE; break;
 565         case SNDRV_SEQ_EVENT_CHANPRESS:
 566                 ossev.l.cmd = MIDI_CHN_PRESSURE; break;
 567         case SNDRV_SEQ_EVENT_PITCHBEND:
 568                 ossev.l.cmd = MIDI_PITCH_BEND; break;
 569         default:
 570                 return 0; /* not supported */
 571         }
 572
 573         ossev.v.dev = dev;
 574
 575         switch (ev->type) {
 576         case SNDRV_SEQ_EVENT_NOTEON:
 577         case SNDRV_SEQ_EVENT_NOTEOFF:
 578         case SNDRV_SEQ_EVENT_KEYPRESS:
 579                 ossev.v.code = EV_CHN_VOICE;
 580                 ossev.v.note = ev->data.note.note;
 581                 ossev.v.parm = ev->data.note.velocity;
 582                 ossev.v.chn = ev->data.note.channel;
 583                 break;
 584         case SNDRV_SEQ_EVENT_CONTROLLER:
 585         case SNDRV_SEQ_EVENT_PGMCHANGE:
 586         case SNDRV_SEQ_EVENT_CHANPRESS:
 587                 ossev.l.code = EV_CHN_COMMON;
 588                 ossev.l.p1 = ev->data.control.param;
 589                 ossev.l.val = ev->data.control.value;
 590                 ossev.l.chn = ev->data.control.channel;
 591                 break;
 592         case SNDRV_SEQ_EVENT_PITCHBEND:
 593                 ossev.l.code = EV_CHN_COMMON;
 594                 ossev.l.val = ev->data.control.value + 8192;
 595                 ossev.l.chn = ev->data.control.channel;
 596                 break;
 597         }
 598
 599         snd_seq_oss_readq_put_timestamp(dp->readq, ev->time.tick, dp->seq_mode);
 600         snd_seq_oss_readq_put_event(dp->readq, &ossev);
 601
 602         return 0;
 603 }
 604
 605 /*
 606  * decode event and send MIDI bytes to read queue
 607  */
 608 static int
 609 send_midi_event(struct seq_oss_devinfo *dp, struct snd_seq_event *ev, struct seq_oss_midi *mdev)
 610 {
 611         char msg[32];
 612         int len;
 613
 614         snd_seq_oss_readq_put_timestamp(dp->readq, ev->time.tick, dp->seq_mode);
 615         if (!dp->timer->running)
 616                 len = snd_seq_oss_timer_start(dp->timer);
 617         if (ev->type == SNDRV_SEQ_EVENT_SYSEX) {
 618                 if ((ev->flags & SNDRV_SEQ_EVENT_LENGTH_MASK) == SNDRV_SEQ_EVENT_LENGTH_VARIABLE)
 619                         snd_seq_oss_readq_puts(dp->readq, mdev->seq_device,
 620                                                ev->data.ext.ptr, ev->data.ext.len);
 621         } else {
 622                 len = snd_midi_event_decode(mdev->coder, msg, sizeof(msg), ev);
 623                 if (len > 0)
 624                         snd_seq_oss_readq_puts(dp->readq, mdev->seq_device, msg, len);
 625         }
 626
 627         return 0;
 628 }
 629
 630
 631 /*
 632  * dump midi data
 633  * return 0 : enqueued
 634  *        non-zero : invalid - ignored
 635  */
 636 int
 637 snd_seq_oss_midi_putc(struct seq_oss_devinfo *dp, int dev, unsigned char c, struct snd_seq_event *ev)
 638 {
 639         struct seq_oss_midi *mdev;
 640
 641         if ((mdev = get_mididev(dp, dev)) == NULL)
 642                 return -ENODEV;
 643         if (snd_midi_event_encode_byte(mdev->coder, c, ev) > 0) {
 644                 snd_seq_oss_fill_addr(dp, ev, mdev->client, mdev->port);
 645                 snd_use_lock_free(&mdev->use_lock);
 646                 return 0;
 647         }
 648         snd_use_lock_free(&mdev->use_lock);
 649         return -EINVAL;
 650 }
 651
 652 /*
 653  * create OSS compatible midi_info record
 654  */
 655 int
 656 snd_seq_oss_midi_make_info(struct seq_oss_devinfo *dp, int dev, struct midi_info *inf)
 657 {
 658         struct seq_oss_midi *mdev;
 659
 660         if ((mdev = get_mididev(dp, dev)) == NULL)
 661                 return -ENXIO;
 662         inf->device = dev;
 663         inf->dev_type = 0; /* FIXME: ?? */
 664         inf->capabilities = 0; /* FIXME: ?? */
 665         strlcpy(inf->name, mdev->name, sizeof(inf->name));
 666         snd_use_lock_free(&mdev->use_lock);
 667         return 0;
 668 }
 669
 670
 671 #ifdef CONFIG_PROC_FS
 672 /*
 673  * proc interface
 674  */
 675 static char *
 676 capmode_str(int val)
 677 {
 678         val &= PERM_READ|PERM_WRITE;
 679         if (val == (PERM_READ|PERM_WRITE))
 680                 return "read/write";
 681         else if (val == PERM_READ)
 682                 return "read";
 683         else if (val == PERM_WRITE)
 684                 return "write";
 685         else
 686                 return "none";
 687 }
 688
 689 void
 690 snd_seq_oss_midi_info_read(struct snd_info_buffer *buf)
 691 {
 692         int i;
 693         struct seq_oss_midi *mdev;
 694
 695         snd_iprintf(buf, "\nNumber of MIDI devices: %d\n", max_midi_devs);
 696         for (i = 0; i < max_midi_devs; i++) {
 697                 snd_iprintf(buf, "\nmidi %d: ", i);
 698                 mdev = get_mdev(i);
 699                 if (mdev == NULL) {
 700                         snd_iprintf(buf, "*empty*\n");
 701                         continue;
 702                 }
 703                 snd_iprintf(buf, "[%s] ALSA port %d:%d\n", mdev->name,
 704                             mdev->client, mdev->port);
 705                 snd_iprintf(buf, "  capability %s / opened %s\n",
 706                             capmode_str(mdev->flags),
 707                             capmode_str(mdev->opened));
 708                 snd_use_lock_free(&mdev->use_lock);
 709         }
 710 }
 711 #endif /* CONFIG_PROC_FS */