sound/core/rawmidi.c

   1 /*
   2  *  Abstract layer for MIDI v1.0 stream
   3  *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
   4  *
   5  *
   6  *   This program is free software; you can redistribute it and/or modify
   7  *   it under the terms of the GNU General Public License as published by
   8  *   the Free Software Foundation; either version 2 of the License, or
   9  *   (at your option) any later version.
  10  *
  11  *   This program is distributed in the hope that it will be useful,
  12  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *   GNU General Public License for more details.
  15  *
  16  *   You should have received a copy of the GNU General Public License
  17  *   along with this program; if not, write to the Free Software
  18  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  19  *
  20  */
  21
  22 #include <sound/core.h>
  23 #include <linux/major.h>
  24 #include <linux/init.h>
  25 #include <linux/sched/signal.h>
  26 #include <linux/slab.h>
  27 #include <linux/time.h>
  28 #include <linux/wait.h>
  29 #include <linux/mutex.h>
  30 #include <linux/module.h>
  31 #include <linux/delay.h>
  32 #include <sound/rawmidi.h>
  33 #include <sound/info.h>
  34 #include <sound/control.h>
  35 #include <sound/minors.h>
  36 #include <sound/initval.h>
  37
  38 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
  39 MODULE_DESCRIPTION("Midlevel RawMidi code for ALSA.");
  40 MODULE_LICENSE("GPL");
  41
  42 #ifdef CONFIG_SND_OSSEMUL
  43 static int midi_map[SNDRV_CARDS];
  44 static int amidi_map[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS-1)] = 1};
  45 module_param_array(midi_map, int, NULL, 0444);
  46 MODULE_PARM_DESC(midi_map, "Raw MIDI device number assigned to 1st OSS device.");
  47 module_param_array(amidi_map, int, NULL, 0444);
  48 MODULE_PARM_DESC(amidi_map, "Raw MIDI device number assigned to 2nd OSS device.");
  49 #endif /* CONFIG_SND_OSSEMUL */
  50
  51 static int snd_rawmidi_free(struct snd_rawmidi *rawmidi);
  52 static int snd_rawmidi_dev_free(struct snd_device *device);
  53 static int snd_rawmidi_dev_register(struct snd_device *device);
  54 static int snd_rawmidi_dev_disconnect(struct snd_device *device);
  55
  56 static LIST_HEAD(snd_rawmidi_devices);
  57 static DEFINE_MUTEX(register_mutex);
  58
  59 #define rmidi_err(rmidi, fmt, args...) \
  60         dev_err(&(rmidi)->dev, fmt, ##args)
  61 #define rmidi_warn(rmidi, fmt, args...) \
  62         dev_warn(&(rmidi)->dev, fmt, ##args)
  63 #define rmidi_dbg(rmidi, fmt, args...) \
  64         dev_dbg(&(rmidi)->dev, fmt, ##args)
  65
  66 static struct snd_rawmidi *snd_rawmidi_search(struct snd_card *card, int device)
  67 {
  68         struct snd_rawmidi *rawmidi;
  69
  70         list_for_each_entry(rawmidi, &snd_rawmidi_devices, list)
  71                 if (rawmidi->card == card && rawmidi->device == device)
  72                         return rawmidi;
  73         return NULL;
  74 }
  75
  76 static inline unsigned short snd_rawmidi_file_flags(struct file *file)
  77 {
  78         switch (file->f_mode & (FMODE_READ | FMODE_WRITE)) {
  79         case FMODE_WRITE:
  80                 return SNDRV_RAWMIDI_LFLG_OUTPUT;
  81         case FMODE_READ:
  82                 return SNDRV_RAWMIDI_LFLG_INPUT;
  83         default:
  84                 return SNDRV_RAWMIDI_LFLG_OPEN;
  85         }
  86 }
  87
  88 static inline int snd_rawmidi_ready(struct snd_rawmidi_substream *substream)
  89 {
  90         struct snd_rawmidi_runtime *runtime = substream->runtime;
  91         return runtime->avail >= runtime->avail_min;
  92 }
  93
  94 static inline int snd_rawmidi_ready_append(struct snd_rawmidi_substream *substream,
  95                                            size_t count)
  96 {
  97         struct snd_rawmidi_runtime *runtime = substream->runtime;
  98         return runtime->avail >= runtime->avail_min &&
  99                (!substream->append || runtime->avail >= count);
 100 }
 101
 102 static void snd_rawmidi_input_event_work(struct work_struct *work)
 103 {
 104         struct snd_rawmidi_runtime *runtime =
 105                 container_of(work, struct snd_rawmidi_runtime, event_work);
 106         if (runtime->event)
 107                 runtime->event(runtime->substream);
 108 }
 109
 110 static int snd_rawmidi_runtime_create(struct snd_rawmidi_substream *substream)
 111 {
 112         struct snd_rawmidi_runtime *runtime;
 113
 114         if ((runtime = kzalloc(sizeof(*runtime), GFP_KERNEL)) == NULL)
 115                 return -ENOMEM;
 116         runtime->substream = substream;
 117         spin_lock_init(&runtime->lock);
 118         init_waitqueue_head(&runtime->sleep);
 119         INIT_WORK(&runtime->event_work, snd_rawmidi_input_event_work);
 120         runtime->event = NULL;
 121         runtime->buffer_size = PAGE_SIZE;
 122         runtime->avail_min = 1;
 123         if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
 124                 runtime->avail = 0;
 125         else
 126                 runtime->avail = runtime->buffer_size;
 127         if ((runtime->buffer = kmalloc(runtime->buffer_size, GFP_KERNEL)) == NULL) {
 128                 kfree(runtime);
 129                 return -ENOMEM;
 130         }
 131         runtime->appl_ptr = runtime->hw_ptr = 0;
 132         substream->runtime = runtime;
 133         return 0;
 134 }
 135
 136 static int snd_rawmidi_runtime_free(struct snd_rawmidi_substream *substream)
 137 {
 138         struct snd_rawmidi_runtime *runtime = substream->runtime;
 139
 140         kfree(runtime->buffer);
 141         kfree(runtime);
 142         substream->runtime = NULL;
 143         return 0;
 144 }
 145
 146 static inline void snd_rawmidi_output_trigger(struct snd_rawmidi_substream *substream,int up)
 147 {
 148         if (!substream->opened)
 149                 return;
 150         substream->ops->trigger(substream, up);
 151 }
 152
 153 static void snd_rawmidi_input_trigger(struct snd_rawmidi_substream *substream, int up)
 154 {
 155         if (!substream->opened)
 156                 return;
 157         substream->ops->trigger(substream, up);
 158         if (!up)
 159                 cancel_work_sync(&substream->runtime->event_work);
 160 }
 161
 162 int snd_rawmidi_drop_output(struct snd_rawmidi_substream *substream)
 163 {
 164         unsigned long flags;
 165         struct snd_rawmidi_runtime *runtime = substream->runtime;
 166
 167         snd_rawmidi_output_trigger(substream, 0);
 168         runtime->drain = 0;
 169         spin_lock_irqsave(&runtime->lock, flags);
 170         runtime->appl_ptr = runtime->hw_ptr = 0;
 171         runtime->avail = runtime->buffer_size;
 172         spin_unlock_irqrestore(&runtime->lock, flags);
 173         return 0;
 174 }
 175 EXPORT_SYMBOL(snd_rawmidi_drop_output);
 176
 177 int snd_rawmidi_drain_output(struct snd_rawmidi_substream *substream)
 178 {
 179         int err;
 180         long timeout;
 181         struct snd_rawmidi_runtime *runtime = substream->runtime;
 182
 183         err = 0;
 184         runtime->drain = 1;
 185         timeout = wait_event_interruptible_timeout(runtime->sleep,
 186                                 (runtime->avail >= runtime->buffer_size),
 187                                 10*HZ);
 188         if (signal_pending(current))
 189                 err = -ERESTARTSYS;
 190         if (runtime->avail < runtime->buffer_size && !timeout) {
 191                 rmidi_warn(substream->rmidi,
 192                            "rawmidi drain error (avail = %li, buffer_size = %li)\n",
 193                            (long)runtime->avail, (long)runtime->buffer_size);
 194                 err = -EIO;
 195         }
 196         runtime->drain = 0;
 197         if (err != -ERESTARTSYS) {
 198                 /* we need wait a while to make sure that Tx FIFOs are empty */
 199                 if (substream->ops->drain)
 200                         substream->ops->drain(substream);
 201                 else
 202                         msleep(50);
 203                 snd_rawmidi_drop_output(substream);
 204         }
 205         return err;
 206 }
 207 EXPORT_SYMBOL(snd_rawmidi_drain_output);
 208
 209 int snd_rawmidi_drain_input(struct snd_rawmidi_substream *substream)
 210 {
 211         unsigned long flags;
 212         struct snd_rawmidi_runtime *runtime = substream->runtime;
 213
 214         snd_rawmidi_input_trigger(substream, 0);
 215         runtime->drain = 0;
 216         spin_lock_irqsave(&runtime->lock, flags);
 217         runtime->appl_ptr = runtime->hw_ptr = 0;
 218         runtime->avail = 0;
 219         spin_unlock_irqrestore(&runtime->lock, flags);
 220         return 0;
 221 }
 222 EXPORT_SYMBOL(snd_rawmidi_drain_input);
 223
 224 /* look for an available substream for the given stream direction;
 225  * if a specific subdevice is given, try to assign it
 226  */
 227 static int assign_substream(struct snd_rawmidi *rmidi, int subdevice,
 228                             int stream, int mode,
 229                             struct snd_rawmidi_substream **sub_ret)
 230 {
 231         struct snd_rawmidi_substream *substream;
 232         struct snd_rawmidi_str *s = &rmidi->streams[stream];
 233         static unsigned int info_flags[2] = {
 234                 [SNDRV_RAWMIDI_STREAM_OUTPUT] = SNDRV_RAWMIDI_INFO_OUTPUT,
 235                 [SNDRV_RAWMIDI_STREAM_INPUT] = SNDRV_RAWMIDI_INFO_INPUT,
 236         };
 237
 238         if (!(rmidi->info_flags & info_flags[stream]))
 239                 return -ENXIO;
 240         if (subdevice >= 0 && subdevice >= s->substream_count)
 241                 return -ENODEV;
 242
 243         list_for_each_entry(substream, &s->substreams, list) {
 244                 if (substream->opened) {
 245                         if (stream == SNDRV_RAWMIDI_STREAM_INPUT ||
 246                             !(mode & SNDRV_RAWMIDI_LFLG_APPEND) ||
 247                             !substream->append)
 248                                 continue;
 249                 }
 250                 if (subdevice < 0 || subdevice == substream->number) {
 251                         *sub_ret = substream;
 252                         return 0;
 253                 }
 254         }
 255         return -EAGAIN;
 256 }
 257
 258 /* open and do ref-counting for the given substream */
 259 static int open_substream(struct snd_rawmidi *rmidi,
 260                           struct snd_rawmidi_substream *substream,
 261                           int mode)
 262 {
 263         int err;
 264
 265         if (substream->use_count == 0) {
 266                 err = snd_rawmidi_runtime_create(substream);
 267                 if (err < 0)
 268                         return err;
 269                 err = substream->ops->open(substream);
 270                 if (err < 0) {
 271                         snd_rawmidi_runtime_free(substream);
 272                         return err;
 273                 }
 274                 substream->opened = 1;
 275                 substream->active_sensing = 0;
 276                 if (mode & SNDRV_RAWMIDI_LFLG_APPEND)
 277                         substream->append = 1;
 278                 substream->pid = get_pid(task_pid(current));
 279                 rmidi->streams[substream->stream].substream_opened++;
 280         }
 281         substream->use_count++;
 282         return 0;
 283 }
 284
 285 static void close_substream(struct snd_rawmidi *rmidi,
 286                             struct snd_rawmidi_substream *substream,
 287                             int cleanup);
 288
 289 static int rawmidi_open_priv(struct snd_rawmidi *rmidi, int subdevice, int mode,
 290                              struct snd_rawmidi_file *rfile)
 291 {
 292         struct snd_rawmidi_substream *sinput = NULL, *soutput = NULL;
 293         int err;
 294
 295         rfile->input = rfile->output = NULL;
 296         if (mode & SNDRV_RAWMIDI_LFLG_INPUT) {
 297                 err = assign_substream(rmidi, subdevice,
 298                                        SNDRV_RAWMIDI_STREAM_INPUT,
 299                                        mode, &sinput);
 300                 if (err < 0)
 301                         return err;
 302         }
 303         if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) {
 304                 err = assign_substream(rmidi, subdevice,
 305                                        SNDRV_RAWMIDI_STREAM_OUTPUT,
 306                                        mode, &soutput);
 307                 if (err < 0)
 308                         return err;
 309         }
 310
 311         if (sinput) {
 312                 err = open_substream(rmidi, sinput, mode);
 313                 if (err < 0)
 314                         return err;
 315         }
 316         if (soutput) {
 317                 err = open_substream(rmidi, soutput, mode);
 318                 if (err < 0) {
 319                         if (sinput)
 320                                 close_substream(rmidi, sinput, 0);
 321                         return err;
 322                 }
 323         }
 324
 325         rfile->rmidi = rmidi;
 326         rfile->input = sinput;
 327         rfile->output = soutput;
 328         return 0;
 329 }
 330
 331 /* called from sound/core/seq/seq_midi.c */
 332 int snd_rawmidi_kernel_open(struct snd_card *card, int device, int subdevice,
 333                             int mode, struct snd_rawmidi_file * rfile)
 334 {
 335         struct snd_rawmidi *rmidi;
 336         int err;
 337
 338         if (snd_BUG_ON(!rfile))
 339                 return -EINVAL;
 340
 341         mutex_lock(&register_mutex);
 342         rmidi = snd_rawmidi_search(card, device);
 343         if (rmidi == NULL) {
 344                 mutex_unlock(&register_mutex);
 345                 return -ENODEV;
 346         }
 347         if (!try_module_get(rmidi->card->module)) {
 348                 mutex_unlock(&register_mutex);
 349                 return -ENXIO;
 350         }
 351         mutex_unlock(&register_mutex);
 352
 353         mutex_lock(&rmidi->open_mutex);
 354         err = rawmidi_open_priv(rmidi, subdevice, mode, rfile);
 355         mutex_unlock(&rmidi->open_mutex);
 356         if (err < 0)
 357                 module_put(rmidi->card->module);
 358         return err;
 359 }
 360 EXPORT_SYMBOL(snd_rawmidi_kernel_open);
 361
 362 static int snd_rawmidi_open(struct inode *inode, struct file *file)
 363 {
 364         int maj = imajor(inode);
 365         struct snd_card *card;
 366         int subdevice;
 367         unsigned short fflags;
 368         int err;
 369         struct snd_rawmidi *rmidi;
 370         struct snd_rawmidi_file *rawmidi_file = NULL;
 371         wait_queue_entry_t wait;
 372
 373         if ((file->f_flags & O_APPEND) && !(file->f_flags & O_NONBLOCK))
 374                 return -EINVAL;         /* invalid combination */
 375
 376         err = nonseekable_open(inode, file);
 377         if (err < 0)
 378                 return err;
 379
 380         if (maj == snd_major) {
 381                 rmidi = snd_lookup_minor_data(iminor(inode),
 382                                               SNDRV_DEVICE_TYPE_RAWMIDI);
 383 #ifdef CONFIG_SND_OSSEMUL
 384         } else if (maj == SOUND_MAJOR) {
 385                 rmidi = snd_lookup_oss_minor_data(iminor(inode),
 386                                                   SNDRV_OSS_DEVICE_TYPE_MIDI);
 387 #endif
 388         } else
 389                 return -ENXIO;
 390
 391         if (rmidi == NULL)
 392                 return -ENODEV;
 393
 394         if (!try_module_get(rmidi->card->module)) {
 395                 snd_card_unref(rmidi->card);
 396                 return -ENXIO;
 397         }
 398
 399         mutex_lock(&rmidi->open_mutex);
 400         card = rmidi->card;
 401         err = snd_card_file_add(card, file);
 402         if (err < 0)
 403                 goto __error_card;
 404         fflags = snd_rawmidi_file_flags(file);
 405         if ((file->f_flags & O_APPEND) || maj == SOUND_MAJOR) /* OSS emul? */
 406                 fflags |= SNDRV_RAWMIDI_LFLG_APPEND;
 407         rawmidi_file = kmalloc(sizeof(*rawmidi_file), GFP_KERNEL);
 408         if (rawmidi_file == NULL) {
 409                 err = -ENOMEM;
 410                 goto __error;
 411         }
 412         init_waitqueue_entry(&wait, current);
 413         add_wait_queue(&rmidi->open_wait, &wait);
 414         while (1) {
 415                 subdevice = snd_ctl_get_preferred_subdevice(card, SND_CTL_SUBDEV_RAWMIDI);
 416                 err = rawmidi_open_priv(rmidi, subdevice, fflags, rawmidi_file);
 417                 if (err >= 0)
 418                         break;
 419                 if (err == -EAGAIN) {
 420                         if (file->f_flags & O_NONBLOCK) {
 421                                 err = -EBUSY;
 422                                 break;
 423                         }
 424                 } else
 425                         break;
 426                 set_current_state(TASK_INTERRUPTIBLE);
 427                 mutex_unlock(&rmidi->open_mutex);
 428                 schedule();
 429                 mutex_lock(&rmidi->open_mutex);
 430                 if (rmidi->card->shutdown) {
 431                         err = -ENODEV;
 432                         break;
 433                 }
 434                 if (signal_pending(current)) {
 435                         err = -ERESTARTSYS;
 436                         break;
 437                 }
 438         }
 439         remove_wait_queue(&rmidi->open_wait, &wait);
 440         if (err < 0) {
 441                 kfree(rawmidi_file);
 442                 goto __error;
 443         }
 444 #ifdef CONFIG_SND_OSSEMUL
 445         if (rawmidi_file->input && rawmidi_file->input->runtime)
 446                 rawmidi_file->input->runtime->oss = (maj == SOUND_MAJOR);
 447         if (rawmidi_file->output && rawmidi_file->output->runtime)
 448                 rawmidi_file->output->runtime->oss = (maj == SOUND_MAJOR);
 449 #endif
 450         file->private_data = rawmidi_file;
 451         mutex_unlock(&rmidi->open_mutex);
 452         snd_card_unref(rmidi->card);
 453         return 0;
 454
 455  __error:
 456         snd_card_file_remove(card, file);
 457  __error_card:
 458         mutex_unlock(&rmidi->open_mutex);
 459         module_put(rmidi->card->module);
 460         snd_card_unref(rmidi->card);
 461         return err;
 462 }
 463
 464 static void close_substream(struct snd_rawmidi *rmidi,
 465                             struct snd_rawmidi_substream *substream,
 466                             int cleanup)
 467 {
 468         if (--substream->use_count)
 469                 return;
 470
 471         if (cleanup) {
 472                 if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
 473                         snd_rawmidi_input_trigger(substream, 0);
 474                 else {
 475                         if (substream->active_sensing) {
 476                                 unsigned char buf = 0xfe;
 477                                 /* sending single active sensing message
 478                                  * to shut the device up
 479                                  */
 480                                 snd_rawmidi_kernel_write(substream, &buf, 1);
 481                         }
 482                         if (snd_rawmidi_drain_output(substream) == -ERESTARTSYS)
 483                                 snd_rawmidi_output_trigger(substream, 0);
 484                 }
 485         }
 486         substream->ops->close(substream);
 487         if (substream->runtime->private_free)
 488                 substream->runtime->private_free(substream);
 489         snd_rawmidi_runtime_free(substream);
 490         substream->opened = 0;
 491         substream->append = 0;
 492         put_pid(substream->pid);
 493         substream->pid = NULL;
 494         rmidi->streams[substream->stream].substream_opened--;
 495 }
 496
 497 static void rawmidi_release_priv(struct snd_rawmidi_file *rfile)
 498 {
 499         struct snd_rawmidi *rmidi;
 500
 501         rmidi = rfile->rmidi;
 502         mutex_lock(&rmidi->open_mutex);
 503         if (rfile->input) {
 504                 close_substream(rmidi, rfile->input, 1);
 505                 rfile->input = NULL;
 506         }
 507         if (rfile->output) {
 508                 close_substream(rmidi, rfile->output, 1);
 509                 rfile->output = NULL;
 510         }
 511         rfile->rmidi = NULL;
 512         mutex_unlock(&rmidi->open_mutex);
 513         wake_up(&rmidi->open_wait);
 514 }
 515
 516 /* called from sound/core/seq/seq_midi.c */
 517 int snd_rawmidi_kernel_release(struct snd_rawmidi_file *rfile)
 518 {
 519         struct snd_rawmidi *rmidi;
 520
 521         if (snd_BUG_ON(!rfile))
 522                 return -ENXIO;
 523
 524         rmidi = rfile->rmidi;
 525         rawmidi_release_priv(rfile);
 526         module_put(rmidi->card->module);
 527         return 0;
 528 }
 529 EXPORT_SYMBOL(snd_rawmidi_kernel_release);
 530
 531 static int snd_rawmidi_release(struct inode *inode, struct file *file)
 532 {
 533         struct snd_rawmidi_file *rfile;
 534         struct snd_rawmidi *rmidi;
 535         struct module *module;
 536
 537         rfile = file->private_data;
 538         rmidi = rfile->rmidi;
 539         rawmidi_release_priv(rfile);
 540         kfree(rfile);
 541         module = rmidi->card->module;
 542         snd_card_file_remove(rmidi->card, file);
 543         module_put(module);
 544         return 0;
 545 }
 546
 547 static int snd_rawmidi_info(struct snd_rawmidi_substream *substream,
 548                             struct snd_rawmidi_info *info)
 549 {
 550         struct snd_rawmidi *rmidi;
 551
 552         if (substream == NULL)
 553                 return -ENODEV;
 554         rmidi = substream->rmidi;
 555         memset(info, 0, sizeof(*info));
 556         info->card = rmidi->card->number;
 557         info->device = rmidi->device;
 558         info->subdevice = substream->number;
 559         info->stream = substream->stream;
 560         info->flags = rmidi->info_flags;
 561         strcpy(info->id, rmidi->id);
 562         strcpy(info->name, rmidi->name);
 563         strcpy(info->subname, substream->name);
 564         info->subdevices_count = substream->pstr->substream_count;
 565         info->subdevices_avail = (substream->pstr->substream_count -
 566                                   substream->pstr->substream_opened);
 567         return 0;
 568 }
 569
 570 static int snd_rawmidi_info_user(struct snd_rawmidi_substream *substream,
 571                                  struct snd_rawmidi_info __user * _info)
 572 {
 573         struct snd_rawmidi_info info;
 574         int err;
 575         if ((err = snd_rawmidi_info(substream, &info)) < 0)
 576                 return err;
 577         if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
 578                 return -EFAULT;
 579         return 0;
 580 }
 581
 582 static int __snd_rawmidi_info_select(struct snd_card *card,
 583                                      struct snd_rawmidi_info *info)
 584 {
 585         struct snd_rawmidi *rmidi;
 586         struct snd_rawmidi_str *pstr;
 587         struct snd_rawmidi_substream *substream;
 588
 589         rmidi = snd_rawmidi_search(card, info->device);
 590         if (!rmidi)
 591                 return -ENXIO;
 592         if (info->stream < 0 || info->stream > 1)
 593                 return -EINVAL;
 594         pstr = &rmidi->streams[info->stream];
 595         if (pstr->substream_count == 0)
 596                 return -ENOENT;
 597         if (info->subdevice >= pstr->substream_count)
 598                 return -ENXIO;
 599         list_for_each_entry(substream, &pstr->substreams, list) {
 600                 if ((unsigned int)substream->number == info->subdevice)
 601                         return snd_rawmidi_info(substream, info);
 602         }
 603         return -ENXIO;
 604 }
 605
 606 int snd_rawmidi_info_select(struct snd_card *card, struct snd_rawmidi_info *info)
 607 {
 608         int ret;
 609
 610         mutex_lock(&register_mutex);
 611         ret = __snd_rawmidi_info_select(card, info);
 612         mutex_unlock(&register_mutex);
 613         return ret;
 614 }
 615 EXPORT_SYMBOL(snd_rawmidi_info_select);
 616
 617 static int snd_rawmidi_info_select_user(struct snd_card *card,
 618                                         struct snd_rawmidi_info __user *_info)
 619 {
 620         int err;
 621         struct snd_rawmidi_info info;
 622         if (get_user(info.device, &_info->device))
 623                 return -EFAULT;
 624         if (get_user(info.stream, &_info->stream))
 625                 return -EFAULT;
 626         if (get_user(info.subdevice, &_info->subdevice))
 627                 return -EFAULT;
 628         if ((err = snd_rawmidi_info_select(card, &info)) < 0)
 629                 return err;
 630         if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
 631                 return -EFAULT;
 632         return 0;
 633 }
 634
 635 int snd_rawmidi_output_params(struct snd_rawmidi_substream *substream,
 636                               struct snd_rawmidi_params * params)
 637 {
 638         char *newbuf;
 639         struct snd_rawmidi_runtime *runtime = substream->runtime;
 640
 641         if (substream->append && substream->use_count > 1)
 642                 return -EBUSY;
 643         snd_rawmidi_drain_output(substream);
 644         if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L) {
 645                 return -EINVAL;
 646         }
 647         if (params->avail_min < 1 || params->avail_min > params->buffer_size) {
 648                 return -EINVAL;
 649         }
 650         if (params->buffer_size != runtime->buffer_size) {
 651                 newbuf = krealloc(runtime->buffer, params->buffer_size,
 652                                   GFP_KERNEL);
 653                 if (!newbuf)
 654                         return -ENOMEM;
 655                 runtime->buffer = newbuf;
 656                 runtime->buffer_size = params->buffer_size;
 657                 runtime->avail = runtime->buffer_size;
 658         }
 659         runtime->avail_min = params->avail_min;
 660         substream->active_sensing = !params->no_active_sensing;
 661         return 0;
 662 }
 663 EXPORT_SYMBOL(snd_rawmidi_output_params);
 664
 665 int snd_rawmidi_input_params(struct snd_rawmidi_substream *substream,
 666                              struct snd_rawmidi_params * params)
 667 {
 668         char *newbuf;
 669         struct snd_rawmidi_runtime *runtime = substream->runtime;
 670
 671         snd_rawmidi_drain_input(substream);
 672         if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L) {
 673                 return -EINVAL;
 674         }
 675         if (params->avail_min < 1 || params->avail_min > params->buffer_size) {
 676                 return -EINVAL;
 677         }
 678         if (params->buffer_size != runtime->buffer_size) {
 679                 newbuf = krealloc(runtime->buffer, params->buffer_size,
 680                                   GFP_KERNEL);
 681                 if (!newbuf)
 682                         return -ENOMEM;
 683                 runtime->buffer = newbuf;
 684                 runtime->buffer_size = params->buffer_size;
 685         }
 686         runtime->avail_min = params->avail_min;
 687         return 0;
 688 }
 689 EXPORT_SYMBOL(snd_rawmidi_input_params);
 690
 691 static int snd_rawmidi_output_status(struct snd_rawmidi_substream *substream,
 692                                      struct snd_rawmidi_status * status)
 693 {
 694         struct snd_rawmidi_runtime *runtime = substream->runtime;
 695
 696         memset(status, 0, sizeof(*status));
 697         status->stream = SNDRV_RAWMIDI_STREAM_OUTPUT;
 698         spin_lock_irq(&runtime->lock);
 699         status->avail = runtime->avail;
 700         spin_unlock_irq(&runtime->lock);
 701         return 0;
 702 }
 703
 704 static int snd_rawmidi_input_status(struct snd_rawmidi_substream *substream,
 705                                     struct snd_rawmidi_status * status)
 706 {
 707         struct snd_rawmidi_runtime *runtime = substream->runtime;
 708
 709         memset(status, 0, sizeof(*status));
 710         status->stream = SNDRV_RAWMIDI_STREAM_INPUT;
 711         spin_lock_irq(&runtime->lock);
 712         status->avail = runtime->avail;
 713         status->xruns = runtime->xruns;
 714         runtime->xruns = 0;
 715         spin_unlock_irq(&runtime->lock);
 716         return 0;
 717 }
 718
 719 static long snd_rawmidi_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 720 {
 721         struct snd_rawmidi_file *rfile;
 722         void __user *argp = (void __user *)arg;
 723
 724         rfile = file->private_data;
 725         if (((cmd >> 8) & 0xff) != 'W')
 726                 return -ENOTTY;
 727         switch (cmd) {
 728         case SNDRV_RAWMIDI_IOCTL_PVERSION:
 729                 return put_user(SNDRV_RAWMIDI_VERSION, (int __user *)argp) ? -EFAULT : 0;
 730         case SNDRV_RAWMIDI_IOCTL_INFO:
 731         {
 732                 int stream;
 733                 struct snd_rawmidi_info __user *info = argp;
 734                 if (get_user(stream, &info->stream))
 735                         return -EFAULT;
 736                 switch (stream) {
 737                 case SNDRV_RAWMIDI_STREAM_INPUT:
 738                         return snd_rawmidi_info_user(rfile->input, info);
 739                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
 740                         return snd_rawmidi_info_user(rfile->output, info);
 741                 default:
 742                         return -EINVAL;
 743                 }
 744         }
 745         case SNDRV_RAWMIDI_IOCTL_PARAMS:
 746         {
 747                 struct snd_rawmidi_params params;
 748                 if (copy_from_user(&params, argp, sizeof(struct snd_rawmidi_params)))
 749                         return -EFAULT;
 750                 switch (params.stream) {
 751                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
 752                         if (rfile->output == NULL)
 753                                 return -EINVAL;
 754                         return snd_rawmidi_output_params(rfile->output, &params);
 755                 case SNDRV_RAWMIDI_STREAM_INPUT:
 756                         if (rfile->input == NULL)
 757                                 return -EINVAL;
 758                         return snd_rawmidi_input_params(rfile->input, &params);
 759                 default:
 760                         return -EINVAL;
 761                 }
 762         }
 763         case SNDRV_RAWMIDI_IOCTL_STATUS:
 764         {
 765                 int err = 0;
 766                 struct snd_rawmidi_status status;
 767                 if (copy_from_user(&status, argp, sizeof(struct snd_rawmidi_status)))
 768                         return -EFAULT;
 769                 switch (status.stream) {
 770                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
 771                         if (rfile->output == NULL)
 772                                 return -EINVAL;
 773                         err = snd_rawmidi_output_status(rfile->output, &status);
 774                         break;
 775                 case SNDRV_RAWMIDI_STREAM_INPUT:
 776                         if (rfile->input == NULL)
 777                                 return -EINVAL;
 778                         err = snd_rawmidi_input_status(rfile->input, &status);
 779                         break;
 780                 default:
 781                         return -EINVAL;
 782                 }
 783                 if (err < 0)
 784                         return err;
 785                 if (copy_to_user(argp, &status, sizeof(struct snd_rawmidi_status)))
 786                         return -EFAULT;
 787                 return 0;
 788         }
 789         case SNDRV_RAWMIDI_IOCTL_DROP:
 790         {
 791                 int val;
 792                 if (get_user(val, (int __user *) argp))
 793                         return -EFAULT;
 794                 switch (val) {
 795                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
 796                         if (rfile->output == NULL)
 797                                 return -EINVAL;
 798                         return snd_rawmidi_drop_output(rfile->output);
 799                 default:
 800                         return -EINVAL;
 801                 }
 802         }
 803         case SNDRV_RAWMIDI_IOCTL_DRAIN:
 804         {
 805                 int val;
 806                 if (get_user(val, (int __user *) argp))
 807                         return -EFAULT;
 808                 switch (val) {
 809                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
 810                         if (rfile->output == NULL)
 811                                 return -EINVAL;
 812                         return snd_rawmidi_drain_output(rfile->output);
 813                 case SNDRV_RAWMIDI_STREAM_INPUT:
 814                         if (rfile->input == NULL)
 815                                 return -EINVAL;
 816                         return snd_rawmidi_drain_input(rfile->input);
 817                 default:
 818                         return -EINVAL;
 819                 }
 820         }
 821         default:
 822                 rmidi_dbg(rfile->rmidi,
 823                           "rawmidi: unknown command = 0x%x\n", cmd);
 824         }
 825         return -ENOTTY;
 826 }
 827
 828 static int snd_rawmidi_control_ioctl(struct snd_card *card,
 829                                      struct snd_ctl_file *control,
 830                                      unsigned int cmd,
 831                                      unsigned long arg)
 832 {
 833         void __user *argp = (void __user *)arg;
 834
 835         switch (cmd) {
 836         case SNDRV_CTL_IOCTL_RAWMIDI_NEXT_DEVICE:
 837         {
 838                 int device;
 839
 840                 if (get_user(device, (int __user *)argp))
 841                         return -EFAULT;
 842                 if (device >= SNDRV_RAWMIDI_DEVICES) /* next device is -1 */
 843                         device = SNDRV_RAWMIDI_DEVICES - 1;
 844                 mutex_lock(&register_mutex);
 845                 device = device < 0 ? 0 : device + 1;
 846                 while (device < SNDRV_RAWMIDI_DEVICES) {
 847                         if (snd_rawmidi_search(card, device))
 848                                 break;
 849                         device++;
 850                 }
 851                 if (device == SNDRV_RAWMIDI_DEVICES)
 852                         device = -1;
 853                 mutex_unlock(&register_mutex);
 854                 if (put_user(device, (int __user *)argp))
 855                         return -EFAULT;
 856                 return 0;
 857         }
 858         case SNDRV_CTL_IOCTL_RAWMIDI_PREFER_SUBDEVICE:
 859         {
 860                 int val;
 861
 862                 if (get_user(val, (int __user *)argp))
 863                         return -EFAULT;
 864                 control->preferred_subdevice[SND_CTL_SUBDEV_RAWMIDI] = val;
 865                 return 0;
 866         }
 867         case SNDRV_CTL_IOCTL_RAWMIDI_INFO:
 868                 return snd_rawmidi_info_select_user(card, argp);
 869         }
 870         return -ENOIOCTLCMD;
 871 }
 872
 873 /**
 874  * snd_rawmidi_receive - receive the input data from the device
 875  * @substream: the rawmidi substream
 876  * @buffer: the buffer pointer
 877  * @count: the data size to read
 878  *
 879  * Reads the data from the internal buffer.
 880  *
 881  * Return: The size of read data, or a negative error code on failure.
 882  */
 883 int snd_rawmidi_receive(struct snd_rawmidi_substream *substream,
 884                         const unsigned char *buffer, int count)
 885 {
 886         unsigned long flags;
 887         int result = 0, count1;
 888         struct snd_rawmidi_runtime *runtime = substream->runtime;
 889
 890         if (!substream->opened)
 891                 return -EBADFD;
 892         if (runtime->buffer == NULL) {
 893                 rmidi_dbg(substream->rmidi,
 894                           "snd_rawmidi_receive: input is not active!!!\n");
 895                 return -EINVAL;
 896         }
 897         spin_lock_irqsave(&runtime->lock, flags);
 898         if (count == 1) {       /* special case, faster code */
 899                 substream->bytes++;
 900                 if (runtime->avail < runtime->buffer_size) {
 901                         runtime->buffer[runtime->hw_ptr++] = buffer[0];
 902                         runtime->hw_ptr %= runtime->buffer_size;
 903                         runtime->avail++;
 904                         result++;
 905                 } else {
 906                         runtime->xruns++;
 907                 }
 908         } else {
 909                 substream->bytes += count;
 910                 count1 = runtime->buffer_size - runtime->hw_ptr;
 911                 if (count1 > count)
 912                         count1 = count;
 913                 if (count1 > (int)(runtime->buffer_size - runtime->avail))
 914                         count1 = runtime->buffer_size - runtime->avail;
 915                 memcpy(runtime->buffer + runtime->hw_ptr, buffer, count1);
 916                 runtime->hw_ptr += count1;
 917                 runtime->hw_ptr %= runtime->buffer_size;
 918                 runtime->avail += count1;
 919                 count -= count1;
 920                 result += count1;
 921                 if (count > 0) {
 922                         buffer += count1;
 923                         count1 = count;
 924                         if (count1 > (int)(runtime->buffer_size - runtime->avail)) {
 925                                 count1 = runtime->buffer_size - runtime->avail;
 926                                 runtime->xruns += count - count1;
 927                         }
 928                         if (count1 > 0) {
 929                                 memcpy(runtime->buffer, buffer, count1);
 930                                 runtime->hw_ptr = count1;
 931                                 runtime->avail += count1;
 932                                 result += count1;
 933                         }
 934                 }
 935         }
 936         if (result > 0) {
 937                 if (runtime->event)
 938                         schedule_work(&runtime->event_work);
 939                 else if (snd_rawmidi_ready(substream))
 940                         wake_up(&runtime->sleep);
 941         }
 942         spin_unlock_irqrestore(&runtime->lock, flags);
 943         return result;
 944 }
 945 EXPORT_SYMBOL(snd_rawmidi_receive);
 946
 947 static long snd_rawmidi_kernel_read1(struct snd_rawmidi_substream *substream,
 948                                      unsigned char __user *userbuf,
 949                                      unsigned char *kernelbuf, long count)
 950 {
 951         unsigned long flags;
 952         long result = 0, count1;
 953         struct snd_rawmidi_runtime *runtime = substream->runtime;
 954         unsigned long appl_ptr;
 955
 956         spin_lock_irqsave(&runtime->lock, flags);
 957         while (count > 0 && runtime->avail) {
 958                 count1 = runtime->buffer_size - runtime->appl_ptr;
 959                 if (count1 > count)
 960                         count1 = count;
 961                 if (count1 > (int)runtime->avail)
 962                         count1 = runtime->avail;
 963
 964                 /* update runtime->appl_ptr before unlocking for userbuf */
 965                 appl_ptr = runtime->appl_ptr;
 966                 runtime->appl_ptr += count1;
 967                 runtime->appl_ptr %= runtime->buffer_size;
 968                 runtime->avail -= count1;
 969
 970                 if (kernelbuf)
 971                         memcpy(kernelbuf + result, runtime->buffer + appl_ptr, count1);
 972                 if (userbuf) {
 973                         spin_unlock_irqrestore(&runtime->lock, flags);
 974                         if (copy_to_user(userbuf + result,
 975                                          runtime->buffer + appl_ptr, count1)) {
 976                                 return result > 0 ? result : -EFAULT;
 977                         }
 978                         spin_lock_irqsave(&runtime->lock, flags);
 979                 }
 980                 result += count1;
 981                 count -= count1;
 982         }
 983         spin_unlock_irqrestore(&runtime->lock, flags);
 984         return result;
 985 }
 986
 987 long snd_rawmidi_kernel_read(struct snd_rawmidi_substream *substream,
 988                              unsigned char *buf, long count)
 989 {
 990         snd_rawmidi_input_trigger(substream, 1);
 991         return snd_rawmidi_kernel_read1(substream, NULL/*userbuf*/, buf, count);
 992 }
 993 EXPORT_SYMBOL(snd_rawmidi_kernel_read);
 994
 995 static ssize_t snd_rawmidi_read(struct file *file, char __user *buf, size_t count,
 996                                 loff_t *offset)
 997 {
 998         long result;
 999         int count1;
1000         struct snd_rawmidi_file *rfile;
1001         struct snd_rawmidi_substream *substream;
1002         struct snd_rawmidi_runtime *runtime;
1003
1004         rfile = file->private_data;
1005         substream = rfile->input;
1006         if (substream == NULL)
1007                 return -EIO;
1008         runtime = substream->runtime;
1009         snd_rawmidi_input_trigger(substream, 1);
1010         result = 0;
1011         while (count > 0) {
1012                 spin_lock_irq(&runtime->lock);
1013                 while (!snd_rawmidi_ready(substream)) {
1014                         wait_queue_entry_t wait;
1015                         if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1016                                 spin_unlock_irq(&runtime->lock);
1017                                 return result > 0 ? result : -EAGAIN;
1018                         }
1019                         init_waitqueue_entry(&wait, current);
1020                         add_wait_queue(&runtime->sleep, &wait);
1021                         set_current_state(TASK_INTERRUPTIBLE);
1022                         spin_unlock_irq(&runtime->lock);
1023                         schedule();
1024                         remove_wait_queue(&runtime->sleep, &wait);
1025                         if (rfile->rmidi->card->shutdown)
1026                                 return -ENODEV;
1027                         if (signal_pending(current))
1028                                 return result > 0 ? result : -ERESTARTSYS;
1029                         if (!runtime->avail)
1030                                 return result > 0 ? result : -EIO;
1031                         spin_lock_irq(&runtime->lock);
1032                 }
1033                 spin_unlock_irq(&runtime->lock);
1034                 count1 = snd_rawmidi_kernel_read1(substream,
1035                                                   (unsigned char __user *)buf,
1036                                                   NULL/*kernelbuf*/,
1037                                                   count);
1038                 if (count1 < 0)
1039                         return result > 0 ? result : count1;
1040                 result += count1;
1041                 buf += count1;
1042                 count -= count1;
1043         }
1044         return result;
1045 }
1046
1047 /**
1048  * snd_rawmidi_transmit_empty - check whether the output buffer is empty
1049  * @substream: the rawmidi substream
1050  *
1051  * Return: 1 if the internal output buffer is empty, 0 if not.
1052  */
1053 int snd_rawmidi_transmit_empty(struct snd_rawmidi_substream *substream)
1054 {
1055         struct snd_rawmidi_runtime *runtime = substream->runtime;
1056         int result;
1057         unsigned long flags;
1058
1059         if (runtime->buffer == NULL) {
1060                 rmidi_dbg(substream->rmidi,
1061                           "snd_rawmidi_transmit_empty: output is not active!!!\n");
1062                 return 1;
1063         }
1064         spin_lock_irqsave(&runtime->lock, flags);
1065         result = runtime->avail >= runtime->buffer_size;
1066         spin_unlock_irqrestore(&runtime->lock, flags);
1067         return result;
1068 }
1069 EXPORT_SYMBOL(snd_rawmidi_transmit_empty);
1070
1071 /**
1072  * __snd_rawmidi_transmit_peek - copy data from the internal buffer
1073  * @substream: the rawmidi substream
1074  * @buffer: the buffer pointer
1075  * @count: data size to transfer
1076  *
1077  * This is a variant of snd_rawmidi_transmit_peek() without spinlock.
1078  */
1079 int __snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
1080                               unsigned char *buffer, int count)
1081 {
1082         int result, count1;
1083         struct snd_rawmidi_runtime *runtime = substream->runtime;
1084
1085         if (runtime->buffer == NULL) {
1086                 rmidi_dbg(substream->rmidi,
1087                           "snd_rawmidi_transmit_peek: output is not active!!!\n");
1088                 return -EINVAL;
1089         }
1090         result = 0;
1091         if (runtime->avail >= runtime->buffer_size) {
1092                 /* warning: lowlevel layer MUST trigger down the hardware */
1093                 goto __skip;
1094         }
1095         if (count == 1) {       /* special case, faster code */
1096                 *buffer = runtime->buffer[runtime->hw_ptr];
1097                 result++;
1098         } else {
1099                 count1 = runtime->buffer_size - runtime->hw_ptr;
1100                 if (count1 > count)
1101                         count1 = count;
1102                 if (count1 > (int)(runtime->buffer_size - runtime->avail))
1103                         count1 = runtime->buffer_size - runtime->avail;
1104                 memcpy(buffer, runtime->buffer + runtime->hw_ptr, count1);
1105                 count -= count1;
1106                 result += count1;
1107                 if (count > 0) {
1108                         if (count > (int)(runtime->buffer_size - runtime->avail - count1))
1109                                 count = runtime->buffer_size - runtime->avail - count1;
1110                         memcpy(buffer + count1, runtime->buffer, count);
1111                         result += count;
1112                 }
1113         }
1114       __skip:
1115         return result;
1116 }
1117 EXPORT_SYMBOL(__snd_rawmidi_transmit_peek);
1118
1119 /**
1120  * snd_rawmidi_transmit_peek - copy data from the internal buffer
1121  * @substream: the rawmidi substream
1122  * @buffer: the buffer pointer
1123  * @count: data size to transfer
1124  *
1125  * Copies data from the internal output buffer to the given buffer.
1126  *
1127  * Call this in the interrupt handler when the midi output is ready,
1128  * and call snd_rawmidi_transmit_ack() after the transmission is
1129  * finished.
1130  *
1131  * Return: The size of copied data, or a negative error code on failure.
1132  */
1133 int snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
1134                               unsigned char *buffer, int count)
1135 {
1136         struct snd_rawmidi_runtime *runtime = substream->runtime;
1137         int result;
1138         unsigned long flags;
1139
1140         spin_lock_irqsave(&runtime->lock, flags);
1141         result = __snd_rawmidi_transmit_peek(substream, buffer, count);
1142         spin_unlock_irqrestore(&runtime->lock, flags);
1143         return result;
1144 }
1145 EXPORT_SYMBOL(snd_rawmidi_transmit_peek);
1146
1147 /**
1148  * __snd_rawmidi_transmit_ack - acknowledge the transmission
1149  * @substream: the rawmidi substream
1150  * @count: the transferred count
1151  *
1152  * This is a variant of __snd_rawmidi_transmit_ack() without spinlock.
1153  */
1154 int __snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count)
1155 {
1156         struct snd_rawmidi_runtime *runtime = substream->runtime;
1157
1158         if (runtime->buffer == NULL) {
1159                 rmidi_dbg(substream->rmidi,
1160                           "snd_rawmidi_transmit_ack: output is not active!!!\n");
1161                 return -EINVAL;
1162         }
1163         snd_BUG_ON(runtime->avail + count > runtime->buffer_size);
1164         runtime->hw_ptr += count;
1165         runtime->hw_ptr %= runtime->buffer_size;
1166         runtime->avail += count;
1167         substream->bytes += count;
1168         if (count > 0) {
1169                 if (runtime->drain || snd_rawmidi_ready(substream))
1170                         wake_up(&runtime->sleep);
1171         }
1172         return count;
1173 }
1174 EXPORT_SYMBOL(__snd_rawmidi_transmit_ack);
1175
1176 /**
1177  * snd_rawmidi_transmit_ack - acknowledge the transmission
1178  * @substream: the rawmidi substream
1179  * @count: the transferred count
1180  *
1181  * Advances the hardware pointer for the internal output buffer with
1182  * the given size and updates the condition.
1183  * Call after the transmission is finished.
1184  *
1185  * Return: The advanced size if successful, or a negative error code on failure.
1186  */
1187 int snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count)
1188 {
1189         struct snd_rawmidi_runtime *runtime = substream->runtime;
1190         int result;
1191         unsigned long flags;
1192
1193         spin_lock_irqsave(&runtime->lock, flags);
1194         result = __snd_rawmidi_transmit_ack(substream, count);
1195         spin_unlock_irqrestore(&runtime->lock, flags);
1196         return result;
1197 }
1198 EXPORT_SYMBOL(snd_rawmidi_transmit_ack);
1199
1200 /**
1201  * snd_rawmidi_transmit - copy from the buffer to the device
1202  * @substream: the rawmidi substream
1203  * @buffer: the buffer pointer
1204  * @count: the data size to transfer
1205  *
1206  * Copies data from the buffer to the device and advances the pointer.
1207  *
1208  * Return: The copied size if successful, or a negative error code on failure.
1209  */
1210 int snd_rawmidi_transmit(struct snd_rawmidi_substream *substream,
1211                          unsigned char *buffer, int count)
1212 {
1213         struct snd_rawmidi_runtime *runtime = substream->runtime;
1214         int result;
1215         unsigned long flags;
1216
1217         spin_lock_irqsave(&runtime->lock, flags);
1218         if (!substream->opened)
1219                 result = -EBADFD;
1220         else {
1221                 count = __snd_rawmidi_transmit_peek(substream, buffer, count);
1222                 if (count <= 0)
1223                         result = count;
1224                 else
1225                         result = __snd_rawmidi_transmit_ack(substream, count);
1226         }
1227         spin_unlock_irqrestore(&runtime->lock, flags);
1228         return result;
1229 }
1230 EXPORT_SYMBOL(snd_rawmidi_transmit);
1231
1232 static long snd_rawmidi_kernel_write1(struct snd_rawmidi_substream *substream,
1233                                       const unsigned char __user *userbuf,
1234                                       const unsigned char *kernelbuf,
1235                                       long count)
1236 {
1237         unsigned long flags;
1238         long count1, result;
1239         struct snd_rawmidi_runtime *runtime = substream->runtime;
1240         unsigned long appl_ptr;
1241
1242         if (!kernelbuf && !userbuf)
1243                 return -EINVAL;
1244         if (snd_BUG_ON(!runtime->buffer))
1245                 return -EINVAL;
1246
1247         result = 0;
1248         spin_lock_irqsave(&runtime->lock, flags);
1249         if (substream->append) {
1250                 if ((long)runtime->avail < count) {
1251                         spin_unlock_irqrestore(&runtime->lock, flags);
1252                         return -EAGAIN;
1253                 }
1254         }
1255         while (count > 0 && runtime->avail > 0) {
1256                 count1 = runtime->buffer_size - runtime->appl_ptr;
1257                 if (count1 > count)
1258                         count1 = count;
1259                 if (count1 > (long)runtime->avail)
1260                         count1 = runtime->avail;
1261
1262                 /* update runtime->appl_ptr before unlocking for userbuf */
1263                 appl_ptr = runtime->appl_ptr;
1264                 runtime->appl_ptr += count1;
1265                 runtime->appl_ptr %= runtime->buffer_size;
1266                 runtime->avail -= count1;
1267
1268                 if (kernelbuf)
1269                         memcpy(runtime->buffer + appl_ptr,
1270                                kernelbuf + result, count1);
1271                 else if (userbuf) {
1272                         spin_unlock_irqrestore(&runtime->lock, flags);
1273                         if (copy_from_user(runtime->buffer + appl_ptr,
1274                                            userbuf + result, count1)) {
1275                                 spin_lock_irqsave(&runtime->lock, flags);
1276                                 result = result > 0 ? result : -EFAULT;
1277                                 goto __end;
1278                         }
1279                         spin_lock_irqsave(&runtime->lock, flags);
1280                 }
1281                 result += count1;
1282                 count -= count1;
1283         }
1284       __end:
1285         count1 = runtime->avail < runtime->buffer_size;
1286         spin_unlock_irqrestore(&runtime->lock, flags);
1287         if (count1)
1288                 snd_rawmidi_output_trigger(substream, 1);
1289         return result;
1290 }
1291
1292 long snd_rawmidi_kernel_write(struct snd_rawmidi_substream *substream,
1293                               const unsigned char *buf, long count)
1294 {
1295         return snd_rawmidi_kernel_write1(substream, NULL, buf, count);
1296 }
1297 EXPORT_SYMBOL(snd_rawmidi_kernel_write);
1298
1299 static ssize_t snd_rawmidi_write(struct file *file, const char __user *buf,
1300                                  size_t count, loff_t *offset)
1301 {
1302         long result, timeout;
1303         int count1;
1304         struct snd_rawmidi_file *rfile;
1305         struct snd_rawmidi_runtime *runtime;
1306         struct snd_rawmidi_substream *substream;
1307
1308         rfile = file->private_data;
1309         substream = rfile->output;
1310         runtime = substream->runtime;
1311         /* we cannot put an atomic message to our buffer */
1312         if (substream->append && count > runtime->buffer_size)
1313                 return -EIO;
1314         result = 0;
1315         while (count > 0) {
1316                 spin_lock_irq(&runtime->lock);
1317                 while (!snd_rawmidi_ready_append(substream, count)) {
1318                         wait_queue_entry_t wait;
1319                         if (file->f_flags & O_NONBLOCK) {
1320                                 spin_unlock_irq(&runtime->lock);
1321                                 return result > 0 ? result : -EAGAIN;
1322                         }
1323                         init_waitqueue_entry(&wait, current);
1324                         add_wait_queue(&runtime->sleep, &wait);
1325                         set_current_state(TASK_INTERRUPTIBLE);
1326                         spin_unlock_irq(&runtime->lock);
1327                         timeout = schedule_timeout(30 * HZ);
1328                         remove_wait_queue(&runtime->sleep, &wait);
1329                         if (rfile->rmidi->card->shutdown)
1330                                 return -ENODEV;
1331                         if (signal_pending(current))
1332                                 return result > 0 ? result : -ERESTARTSYS;
1333                         if (!runtime->avail && !timeout)
1334                                 return result > 0 ? result : -EIO;
1335                         spin_lock_irq(&runtime->lock);
1336                 }
1337                 spin_unlock_irq(&runtime->lock);
1338                 count1 = snd_rawmidi_kernel_write1(substream, buf, NULL, count);
1339                 if (count1 < 0)
1340                         return result > 0 ? result : count1;
1341                 result += count1;
1342                 buf += count1;
1343                 if ((size_t)count1 < count && (file->f_flags & O_NONBLOCK))
1344                         break;
1345                 count -= count1;
1346         }
1347         if (file->f_flags & O_DSYNC) {
1348                 spin_lock_irq(&runtime->lock);
1349                 while (runtime->avail != runtime->buffer_size) {
1350                         wait_queue_entry_t wait;
1351                         unsigned int last_avail = runtime->avail;
1352                         init_waitqueue_entry(&wait, current);
1353                         add_wait_queue(&runtime->sleep, &wait);
1354                         set_current_state(TASK_INTERRUPTIBLE);
1355                         spin_unlock_irq(&runtime->lock);
1356                         timeout = schedule_timeout(30 * HZ);
1357                         remove_wait_queue(&runtime->sleep, &wait);
1358                         if (signal_pending(current))
1359                                 return result > 0 ? result : -ERESTARTSYS;
1360                         if (runtime->avail == last_avail && !timeout)
1361                                 return result > 0 ? result : -EIO;
1362                         spin_lock_irq(&runtime->lock);
1363                 }
1364                 spin_unlock_irq(&runtime->lock);
1365         }
1366         return result;
1367 }
1368
1369 static unsigned int snd_rawmidi_poll(struct file *file, poll_table * wait)
1370 {
1371         struct snd_rawmidi_file *rfile;
1372         struct snd_rawmidi_runtime *runtime;
1373         unsigned int mask;
1374
1375         rfile = file->private_data;
1376         if (rfile->input != NULL) {
1377                 runtime = rfile->input->runtime;
1378                 snd_rawmidi_input_trigger(rfile->input, 1);
1379                 poll_wait(file, &runtime->sleep, wait);
1380         }
1381         if (rfile->output != NULL) {
1382                 runtime = rfile->output->runtime;
1383                 poll_wait(file, &runtime->sleep, wait);
1384         }
1385         mask = 0;
1386         if (rfile->input != NULL) {
1387                 if (snd_rawmidi_ready(rfile->input))
1388                         mask |= POLLIN | POLLRDNORM;
1389         }
1390         if (rfile->output != NULL) {
1391                 if (snd_rawmidi_ready(rfile->output))
1392                         mask |= POLLOUT | POLLWRNORM;
1393         }
1394         return mask;
1395 }
1396
1397 /*
1398  */
1399 #ifdef CONFIG_COMPAT
1400 #include "rawmidi_compat.c"
1401 #else
1402 #define snd_rawmidi_ioctl_compat        NULL
1403 #endif
1404
1405 /*
1406
1407  */
1408
1409 static void snd_rawmidi_proc_info_read(struct snd_info_entry *entry,
1410                                        struct snd_info_buffer *buffer)
1411 {
1412         struct snd_rawmidi *rmidi;
1413         struct snd_rawmidi_substream *substream;
1414         struct snd_rawmidi_runtime *runtime;
1415
1416         rmidi = entry->private_data;
1417         snd_iprintf(buffer, "%s\n\n", rmidi->name);
1418         mutex_lock(&rmidi->open_mutex);
1419         if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_OUTPUT) {
1420                 list_for_each_entry(substream,
1421                                     &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams,
1422                                     list) {
1423                         snd_iprintf(buffer,
1424                                     "Output %d\n"
1425                                     "  Tx bytes     : %lu\n",
1426                                     substream->number,
1427                                     (unsigned long) substream->bytes);
1428                         if (substream->opened) {
1429                                 snd_iprintf(buffer,
1430                                     "  Owner PID    : %d\n",
1431                                     pid_vnr(substream->pid));
1432                                 runtime = substream->runtime;
1433                                 snd_iprintf(buffer,
1434                                     "  Mode         : %s\n"
1435                                     "  Buffer size  : %lu\n"
1436                                     "  Avail        : %lu\n",
1437                                     runtime->oss ? "OSS compatible" : "native",
1438                                     (unsigned long) runtime->buffer_size,
1439                                     (unsigned long) runtime->avail);
1440                         }
1441                 }
1442         }
1443         if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_INPUT) {
1444                 list_for_each_entry(substream,
1445                                     &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams,
1446                                     list) {
1447                         snd_iprintf(buffer,
1448                                     "Input %d\n"
1449                                     "  Rx bytes     : %lu\n",
1450                                     substream->number,
1451                                     (unsigned long) substream->bytes);
1452                         if (substream->opened) {
1453                                 snd_iprintf(buffer,
1454                                             "  Owner PID    : %d\n",
1455                                             pid_vnr(substream->pid));
1456                                 runtime = substream->runtime;
1457                                 snd_iprintf(buffer,
1458                                             "  Buffer size  : %lu\n"
1459                                             "  Avail        : %lu\n"
1460                                             "  Overruns     : %lu\n",
1461                                             (unsigned long) runtime->buffer_size,
1462                                             (unsigned long) runtime->avail,
1463                                             (unsigned long) runtime->xruns);
1464                         }
1465                 }
1466         }
1467         mutex_unlock(&rmidi->open_mutex);
1468 }
1469
1470 /*
1471  *  Register functions
1472  */
1473
1474 static const struct file_operations snd_rawmidi_f_ops =
1475 {
1476         .owner =        THIS_MODULE,
1477         .read =         snd_rawmidi_read,
1478         .write =        snd_rawmidi_write,
1479         .open =         snd_rawmidi_open,
1480         .release =      snd_rawmidi_release,
1481         .llseek =       no_llseek,
1482         .poll =         snd_rawmidi_poll,
1483         .unlocked_ioctl =       snd_rawmidi_ioctl,
1484         .compat_ioctl = snd_rawmidi_ioctl_compat,
1485 };
1486
1487 static int snd_rawmidi_alloc_substreams(struct snd_rawmidi *rmidi,
1488                                         struct snd_rawmidi_str *stream,
1489                                         int direction,
1490                                         int count)
1491 {
1492         struct snd_rawmidi_substream *substream;
1493         int idx;
1494
1495         for (idx = 0; idx < count; idx++) {
1496                 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
1497                 if (!substream)
1498                         return -ENOMEM;
1499                 substream->stream = direction;
1500                 substream->number = idx;
1501                 substream->rmidi = rmidi;
1502                 substream->pstr = stream;
1503                 list_add_tail(&substream->list, &stream->substreams);
1504                 stream->substream_count++;
1505         }
1506         return 0;
1507 }
1508
1509 static void release_rawmidi_device(struct device *dev)
1510 {
1511         kfree(container_of(dev, struct snd_rawmidi, dev));
1512 }
1513
1514 /**
1515  * snd_rawmidi_new - create a rawmidi instance
1516  * @card: the card instance
1517  * @id: the id string
1518  * @device: the device index
1519  * @output_count: the number of output streams
1520  * @input_count: the number of input streams
1521  * @rrawmidi: the pointer to store the new rawmidi instance
1522  *
1523  * Creates a new rawmidi instance.
1524  * Use snd_rawmidi_set_ops() to set the operators to the new instance.
1525  *
1526  * Return: Zero if successful, or a negative error code on failure.
1527  */
1528 int snd_rawmidi_new(struct snd_card *card, char *id, int device,
1529                     int output_count, int input_count,
1530                     struct snd_rawmidi ** rrawmidi)
1531 {
1532         struct snd_rawmidi *rmidi;
1533         int err;
1534         static struct snd_device_ops ops = {
1535                 .dev_free = snd_rawmidi_dev_free,
1536                 .dev_register = snd_rawmidi_dev_register,
1537                 .dev_disconnect = snd_rawmidi_dev_disconnect,
1538         };
1539
1540         if (snd_BUG_ON(!card))
1541                 return -ENXIO;
1542         if (rrawmidi)
1543                 *rrawmidi = NULL;
1544         rmidi = kzalloc(sizeof(*rmidi), GFP_KERNEL);
1545         if (!rmidi)
1546                 return -ENOMEM;
1547         rmidi->card = card;
1548         rmidi->device = device;
1549         mutex_init(&rmidi->open_mutex);
1550         init_waitqueue_head(&rmidi->open_wait);
1551         INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams);
1552         INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams);
1553
1554         if (id != NULL)
1555                 strlcpy(rmidi->id, id, sizeof(rmidi->id));
1556
1557         snd_device_initialize(&rmidi->dev, card);
1558         rmidi->dev.release = release_rawmidi_device;
1559         dev_set_name(&rmidi->dev, "midiC%iD%i", card->number, device);
1560
1561         if ((err = snd_rawmidi_alloc_substreams(rmidi,
1562                                                 &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT],
1563                                                 SNDRV_RAWMIDI_STREAM_INPUT,
1564                                                 input_count)) < 0) {
1565                 snd_rawmidi_free(rmidi);
1566                 return err;
1567         }
1568         if ((err = snd_rawmidi_alloc_substreams(rmidi,
1569                                                 &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT],
1570                                                 SNDRV_RAWMIDI_STREAM_OUTPUT,
1571                                                 output_count)) < 0) {
1572                 snd_rawmidi_free(rmidi);
1573                 return err;
1574         }
1575         if ((err = snd_device_new(card, SNDRV_DEV_RAWMIDI, rmidi, &ops)) < 0) {
1576                 snd_rawmidi_free(rmidi);
1577                 return err;
1578         }
1579         if (rrawmidi)
1580                 *rrawmidi = rmidi;
1581         return 0;
1582 }
1583 EXPORT_SYMBOL(snd_rawmidi_new);
1584
1585 static void snd_rawmidi_free_substreams(struct snd_rawmidi_str *stream)
1586 {
1587         struct snd_rawmidi_substream *substream;
1588
1589         while (!list_empty(&stream->substreams)) {
1590                 substream = list_entry(stream->substreams.next, struct snd_rawmidi_substream, list);
1591                 list_del(&substream->list);
1592                 kfree(substream);
1593         }
1594 }
1595
1596 static int snd_rawmidi_free(struct snd_rawmidi *rmidi)
1597 {
1598         if (!rmidi)
1599                 return 0;
1600
1601         snd_info_free_entry(rmidi->proc_entry);
1602         rmidi->proc_entry = NULL;
1603         mutex_lock(&register_mutex);
1604         if (rmidi->ops && rmidi->ops->dev_unregister)
1605                 rmidi->ops->dev_unregister(rmidi);
1606         mutex_unlock(&register_mutex);
1607
1608         snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT]);
1609         snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT]);
1610         if (rmidi->private_free)
1611                 rmidi->private_free(rmidi);
1612         put_device(&rmidi->dev);
1613         return 0;
1614 }
1615
1616 static int snd_rawmidi_dev_free(struct snd_device *device)
1617 {
1618         struct snd_rawmidi *rmidi = device->device_data;
1619         return snd_rawmidi_free(rmidi);
1620 }
1621
1622 #if IS_ENABLED(CONFIG_SND_SEQUENCER)
1623 static void snd_rawmidi_dev_seq_free(struct snd_seq_device *device)
1624 {
1625         struct snd_rawmidi *rmidi = device->private_data;
1626         rmidi->seq_dev = NULL;
1627 }
1628 #endif
1629
1630 static int snd_rawmidi_dev_register(struct snd_device *device)
1631 {
1632         int err;
1633         struct snd_info_entry *entry;
1634         char name[16];
1635         struct snd_rawmidi *rmidi = device->device_data;
1636
1637         if (rmidi->device >= SNDRV_RAWMIDI_DEVICES)
1638                 return -ENOMEM;
1639         mutex_lock(&register_mutex);
1640         if (snd_rawmidi_search(rmidi->card, rmidi->device)) {
1641                 mutex_unlock(&register_mutex);
1642                 return -EBUSY;
1643         }
1644         list_add_tail(&rmidi->list, &snd_rawmidi_devices);
1645         mutex_unlock(&register_mutex);
1646         err = snd_register_device(SNDRV_DEVICE_TYPE_RAWMIDI,
1647                                   rmidi->card, rmidi->device,
1648                                   &snd_rawmidi_f_ops, rmidi, &rmidi->dev);
1649         if (err < 0) {
1650                 rmidi_err(rmidi, "unable to register\n");
1651                 mutex_lock(&register_mutex);
1652                 list_del(&rmidi->list);
1653                 mutex_unlock(&register_mutex);
1654                 return err;
1655         }
1656         if (rmidi->ops && rmidi->ops->dev_register &&
1657             (err = rmidi->ops->dev_register(rmidi)) < 0) {
1658                 snd_unregister_device(&rmidi->dev);
1659                 mutex_lock(&register_mutex);
1660                 list_del(&rmidi->list);
1661                 mutex_unlock(&register_mutex);
1662                 return err;
1663         }
1664 #ifdef CONFIG_SND_OSSEMUL
1665         rmidi->ossreg = 0;
1666         if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1667                 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1668                                             rmidi->card, 0, &snd_rawmidi_f_ops,
1669                                             rmidi) < 0) {
1670                         rmidi_err(rmidi,
1671                                   "unable to register OSS rawmidi device %i:%i\n",
1672                                   rmidi->card->number, 0);
1673                 } else {
1674                         rmidi->ossreg++;
1675 #ifdef SNDRV_OSS_INFO_DEV_MIDI
1676                         snd_oss_info_register(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number, rmidi->name);
1677 #endif
1678                 }
1679         }
1680         if ((int)rmidi->device == amidi_map[rmidi->card->number]) {
1681                 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1682                                             rmidi->card, 1, &snd_rawmidi_f_ops,
1683                                             rmidi) < 0) {
1684                         rmidi_err(rmidi,
1685                                   "unable to register OSS rawmidi device %i:%i\n",
1686                                   rmidi->card->number, 1);
1687                 } else {
1688                         rmidi->ossreg++;
1689                 }
1690         }
1691 #endif /* CONFIG_SND_OSSEMUL */
1692         sprintf(name, "midi%d", rmidi->device);
1693         entry = snd_info_create_card_entry(rmidi->card, name, rmidi->card->proc_root);
1694         if (entry) {
1695                 entry->private_data = rmidi;
1696                 entry->c.text.read = snd_rawmidi_proc_info_read;
1697                 if (snd_info_register(entry) < 0) {
1698                         snd_info_free_entry(entry);
1699                         entry = NULL;
1700                 }
1701         }
1702         rmidi->proc_entry = entry;
1703 #if IS_ENABLED(CONFIG_SND_SEQUENCER)
1704         if (!rmidi->ops || !rmidi->ops->dev_register) { /* own registration mechanism */
1705                 if (snd_seq_device_new(rmidi->card, rmidi->device, SNDRV_SEQ_DEV_ID_MIDISYNTH, 0, &rmidi->seq_dev) >= 0) {
1706                         rmidi->seq_dev->private_data = rmidi;
1707                         rmidi->seq_dev->private_free = snd_rawmidi_dev_seq_free;
1708                         sprintf(rmidi->seq_dev->name, "MIDI %d-%d", rmidi->card->number, rmidi->device);
1709                         snd_device_register(rmidi->card, rmidi->seq_dev);
1710                 }
1711         }
1712 #endif
1713         return 0;
1714 }
1715
1716 static int snd_rawmidi_dev_disconnect(struct snd_device *device)
1717 {
1718         struct snd_rawmidi *rmidi = device->device_data;
1719         int dir;
1720
1721         mutex_lock(&register_mutex);
1722         mutex_lock(&rmidi->open_mutex);
1723         wake_up(&rmidi->open_wait);
1724         list_del_init(&rmidi->list);
1725         for (dir = 0; dir < 2; dir++) {
1726                 struct snd_rawmidi_substream *s;
1727                 list_for_each_entry(s, &rmidi->streams[dir].substreams, list) {
1728                         if (s->runtime)
1729                                 wake_up(&s->runtime->sleep);
1730                 }
1731         }
1732
1733 #ifdef CONFIG_SND_OSSEMUL
1734         if (rmidi->ossreg) {
1735                 if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1736                         snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 0);
1737 #ifdef SNDRV_OSS_INFO_DEV_MIDI
1738                         snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number);
1739 #endif
1740                 }
1741                 if ((int)rmidi->device == amidi_map[rmidi->card->number])
1742                         snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 1);
1743                 rmidi->ossreg = 0;
1744         }
1745 #endif /* CONFIG_SND_OSSEMUL */
1746         snd_unregister_device(&rmidi->dev);
1747         mutex_unlock(&rmidi->open_mutex);
1748         mutex_unlock(&register_mutex);
1749         return 0;
1750 }
1751
1752 /**
1753  * snd_rawmidi_set_ops - set the rawmidi operators
1754  * @rmidi: the rawmidi instance
1755  * @stream: the stream direction, SNDRV_RAWMIDI_STREAM_XXX
1756  * @ops: the operator table
1757  *
1758  * Sets the rawmidi operators for the given stream direction.
1759  */
1760 void snd_rawmidi_set_ops(struct snd_rawmidi *rmidi, int stream,
1761                          const struct snd_rawmidi_ops *ops)
1762 {
1763         struct snd_rawmidi_substream *substream;
1764
1765         list_for_each_entry(substream, &rmidi->streams[stream].substreams, list)
1766                 substream->ops = ops;
1767 }
1768 EXPORT_SYMBOL(snd_rawmidi_set_ops);
1769
1770 /*
1771  *  ENTRY functions
1772  */
1773
1774 static int __init alsa_rawmidi_init(void)
1775 {
1776
1777         snd_ctl_register_ioctl(snd_rawmidi_control_ioctl);
1778         snd_ctl_register_ioctl_compat(snd_rawmidi_control_ioctl);
1779 #ifdef CONFIG_SND_OSSEMUL
1780         { int i;
1781         /* check device map table */
1782         for (i = 0; i < SNDRV_CARDS; i++) {
1783                 if (midi_map[i] < 0 || midi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1784                         pr_err("ALSA: rawmidi: invalid midi_map[%d] = %d\n",
1785                                i, midi_map[i]);
1786                         midi_map[i] = 0;
1787                 }
1788                 if (amidi_map[i] < 0 || amidi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1789                         pr_err("ALSA: rawmidi: invalid amidi_map[%d] = %d\n",
1790                                i, amidi_map[i]);
1791                         amidi_map[i] = 1;
1792                 }
1793         }
1794         }
1795 #endif /* CONFIG_SND_OSSEMUL */
1796         return 0;
1797 }
1798
1799 static void __exit alsa_rawmidi_exit(void)
1800 {
1801         snd_ctl_unregister_ioctl(snd_rawmidi_control_ioctl);
1802         snd_ctl_unregister_ioctl_compat(snd_rawmidi_control_ioctl);
1803 }
1804
1805 module_init(alsa_rawmidi_init)
1806 module_exit(alsa_rawmidi_exit)