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