LXR linux/sound/core/seq/oss/seq_oss

   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 */
  42struct 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 */
  58static int max_midi_devs;
  59static struct seq_oss_midi *midi_devs[SNDRV_SEQ_OSS_MAX_MIDI_DEVS];
  60
  61static DEFINE_SPINLOCK(register_lock);
  62
  63/*
  64 * prototypes
  65 */
  66static struct seq_oss_midi *get_mdev(int dev);
  67static struct seq_oss_midi *get_mididev(struct seq_oss_devinfo *dp, int dev);
  68static int send_synth_event(struct seq_oss_devinfo *dp, struct snd_seq_event *ev, int dev);
  69static 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 */
  75int
  76snd_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 */
 105static struct seq_oss_midi *
 106get_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 */
 122static struct seq_oss_midi *
 123find_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 */
 149int
 150snd_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 */
 226int
 227snd_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 */
 256void
 257snd_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 */
 279void
 280snd_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 */
 288void
 289snd_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 */
 301void
 302snd_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 */
 313static struct seq_oss_midi *
 314get_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 */
 325int
 326snd_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 */
 392int
 393snd_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 */
 429int
 430snd_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 */
 452void
 453snd_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 */
 500void
 501snd_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 */
 516int
 517snd_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 */
 544static int
 545send_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 */
 605static int
 606send_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 */
 633int
 634snd_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 */
 652int
 653snd_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 */
 672static char *
 673capmode_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
 686void
 687snd_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 */
 709