sound/core/rawmidi.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  Abstract layer for MIDI v1.0 stream
   4  *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
   5  */
   6
   7 #include <sound/core.h>
   8 #include <linux/major.h>
   9 #include <linux/init.h>
  10 #include <linux/sched/signal.h>
  11 #include <linux/slab.h>
  12 #include <linux/time.h>
  13 #include <linux/wait.h>
  14 #include <linux/mutex.h>
  15 #include <linux/module.h>
  16 #include <linux/delay.h>
  17 #include <linux/mm.h>
  18 #include <linux/nospec.h>
  19 #include <sound/rawmidi.h>
  20 #include <sound/info.h>
  21 #include <sound/control.h>
  22 #include <sound/minors.h>
  23 #include <sound/initval.h>
  24
  25 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
  26 MODULE_DESCRIPTION("Midlevel RawMidi code for ALSA.");
  27 MODULE_LICENSE("GPL");
  28
  29 #ifdef CONFIG_SND_OSSEMUL
  30 static int midi_map[SNDRV_CARDS];
  31 static int amidi_map[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS-1)] = 1};
  32 module_param_array(midi_map, int, NULL, 0444);
  33 MODULE_PARM_DESC(midi_map, "Raw MIDI device number assigned to 1st OSS device.");
  34 module_param_array(amidi_map, int, NULL, 0444);
  35 MODULE_PARM_DESC(amidi_map, "Raw MIDI device number assigned to 2nd OSS device.");
  36 #endif /* CONFIG_SND_OSSEMUL */
  37
  38 static int snd_rawmidi_free(struct snd_rawmidi *rawmidi);
  39 static int snd_rawmidi_dev_free(struct snd_device *device);
  40 static int snd_rawmidi_dev_register(struct snd_device *device);
  41 static int snd_rawmidi_dev_disconnect(struct snd_device *device);
  42
  43 static LIST_HEAD(snd_rawmidi_devices);
  44 static DEFINE_MUTEX(register_mutex);
  45
  46 #define rmidi_err(rmidi, fmt, args...) \
  47         dev_err(&(rmidi)->dev, fmt, ##args)
  48 #define rmidi_warn(rmidi, fmt, args...) \
  49         dev_warn(&(rmidi)->dev, fmt, ##args)
  50 #define rmidi_dbg(rmidi, fmt, args...) \
  51         dev_dbg(&(rmidi)->dev, fmt, ##args)
  52
  53 static struct snd_rawmidi *snd_rawmidi_search(struct snd_card *card, int device)
  54 {
  55         struct snd_rawmidi *rawmidi;
  56
  57         list_for_each_entry(rawmidi, &snd_rawmidi_devices, list)
  58                 if (rawmidi->card == card && rawmidi->device == device)
  59                         return rawmidi;
  60         return NULL;
  61 }
  62
  63 static inline unsigned short snd_rawmidi_file_flags(struct file *file)
  64 {
  65         switch (file->f_mode & (FMODE_READ | FMODE_WRITE)) {
  66         case FMODE_WRITE:
  67                 return SNDRV_RAWMIDI_LFLG_OUTPUT;
  68         case FMODE_READ:
  69                 return SNDRV_RAWMIDI_LFLG_INPUT;
  70         default:
  71                 return SNDRV_RAWMIDI_LFLG_OPEN;
  72         }
  73 }
  74
  75 static inline int snd_rawmidi_ready(struct snd_rawmidi_substream *substream)
  76 {
  77         struct snd_rawmidi_runtime *runtime = substream->runtime;
  78
  79         return runtime->avail >= runtime->avail_min;
  80 }
  81
  82 static inline int snd_rawmidi_ready_append(struct snd_rawmidi_substream *substream,
  83                                            size_t count)
  84 {
  85         struct snd_rawmidi_runtime *runtime = substream->runtime;
  86
  87         return runtime->avail >= runtime->avail_min &&
  88                (!substream->append || runtime->avail >= count);
  89 }
  90
  91 static void snd_rawmidi_input_event_work(struct work_struct *work)
  92 {
  93         struct snd_rawmidi_runtime *runtime =
  94                 container_of(work, struct snd_rawmidi_runtime, event_work);
  95
  96         if (runtime->event)
  97                 runtime->event(runtime->substream);
  98 }
  99
 100 static int snd_rawmidi_runtime_create(struct snd_rawmidi_substream *substream)
 101 {
 102         struct snd_rawmidi_runtime *runtime;
 103
 104         runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
 105         if (!runtime)
 106                 return -ENOMEM;
 107         runtime->substream = substream;
 108         spin_lock_init(&runtime->lock);
 109         init_waitqueue_head(&runtime->sleep);
 110         INIT_WORK(&runtime->event_work, snd_rawmidi_input_event_work);
 111         runtime->event = NULL;
 112         runtime->buffer_size = PAGE_SIZE;
 113         runtime->avail_min = 1;
 114         if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
 115                 runtime->avail = 0;
 116         else
 117                 runtime->avail = runtime->buffer_size;
 118         runtime->buffer = kvzalloc(runtime->buffer_size, GFP_KERNEL);
 119         if (!runtime->buffer) {
 120                 kfree(runtime);
 121                 return -ENOMEM;
 122         }
 123         runtime->appl_ptr = runtime->hw_ptr = 0;
 124         substream->runtime = runtime;
 125         return 0;
 126 }
 127
 128 static int snd_rawmidi_runtime_free(struct snd_rawmidi_substream *substream)
 129 {
 130         struct snd_rawmidi_runtime *runtime = substream->runtime;
 131
 132         kvfree(runtime->buffer);
 133         kfree(runtime);
 134         substream->runtime = NULL;
 135         return 0;
 136 }
 137
 138 static inline void snd_rawmidi_output_trigger(struct snd_rawmidi_substream *substream, int up)
 139 {
 140         if (!substream->opened)
 141                 return;
 142         substream->ops->trigger(substream, up);
 143 }
 144
 145 static void snd_rawmidi_input_trigger(struct snd_rawmidi_substream *substream, int up)
 146 {
 147         if (!substream->opened)
 148                 return;
 149         substream->ops->trigger(substream, up);
 150         if (!up)
 151                 cancel_work_sync(&substream->runtime->event_work);
 152 }
 153
 154 static void __reset_runtime_ptrs(struct snd_rawmidi_runtime *runtime,
 155                                  bool is_input)
 156 {
 157         runtime->drain = 0;
 158         runtime->appl_ptr = runtime->hw_ptr = 0;
 159         runtime->avail = is_input ? 0 : runtime->buffer_size;
 160 }
 161
 162 static void reset_runtime_ptrs(struct snd_rawmidi_runtime *runtime,
 163                                bool is_input)
 164 {
 165         unsigned long flags;
 166
 167         spin_lock_irqsave(&runtime->lock, flags);
 168         __reset_runtime_ptrs(runtime, is_input);
 169         spin_unlock_irqrestore(&runtime->lock, flags);
 170 }
 171
 172 int snd_rawmidi_drop_output(struct snd_rawmidi_substream *substream)
 173 {
 174         snd_rawmidi_output_trigger(substream, 0);
 175         reset_runtime_ptrs(substream->runtime, false);
 176         return 0;
 177 }
 178 EXPORT_SYMBOL(snd_rawmidi_drop_output);
 179
 180 int snd_rawmidi_drain_output(struct snd_rawmidi_substream *substream)
 181 {
 182         int err;
 183         long timeout;
 184         struct snd_rawmidi_runtime *runtime = substream->runtime;
 185
 186         err = 0;
 187         runtime->drain = 1;
 188         timeout = wait_event_interruptible_timeout(runtime->sleep,
 189                                 (runtime->avail >= runtime->buffer_size),
 190                                 10*HZ);
 191         if (signal_pending(current))
 192                 err = -ERESTARTSYS;
 193         if (runtime->avail < runtime->buffer_size && !timeout) {
 194                 rmidi_warn(substream->rmidi,
 195                            "rawmidi drain error (avail = %li, buffer_size = %li)\n",
 196                            (long)runtime->avail, (long)runtime->buffer_size);
 197                 err = -EIO;
 198         }
 199         runtime->drain = 0;
 200         if (err != -ERESTARTSYS) {
 201                 /* we need wait a while to make sure that Tx FIFOs are empty */
 202                 if (substream->ops->drain)
 203                         substream->ops->drain(substream);
 204                 else
 205                         msleep(50);
 206                 snd_rawmidi_drop_output(substream);
 207         }
 208         return err;
 209 }
 210 EXPORT_SYMBOL(snd_rawmidi_drain_output);
 211
 212 int snd_rawmidi_drain_input(struct snd_rawmidi_substream *substream)
 213 {
 214         snd_rawmidi_input_trigger(substream, 0);
 215         reset_runtime_ptrs(substream->runtime, true);
 216         return 0;
 217 }
 218 EXPORT_SYMBOL(snd_rawmidi_drain_input);
 219
 220 /* look for an available substream for the given stream direction;
 221  * if a specific subdevice is given, try to assign it
 222  */
 223 static int assign_substream(struct snd_rawmidi *rmidi, int subdevice,
 224                             int stream, int mode,
 225                             struct snd_rawmidi_substream **sub_ret)
 226 {
 227         struct snd_rawmidi_substream *substream;
 228         struct snd_rawmidi_str *s = &rmidi->streams[stream];
 229         static unsigned int info_flags[2] = {
 230                 [SNDRV_RAWMIDI_STREAM_OUTPUT] = SNDRV_RAWMIDI_INFO_OUTPUT,
 231                 [SNDRV_RAWMIDI_STREAM_INPUT] = SNDRV_RAWMIDI_INFO_INPUT,
 232         };
 233
 234         if (!(rmidi->info_flags & info_flags[stream]))
 235                 return -ENXIO;
 236         if (subdevice >= 0 && subdevice >= s->substream_count)
 237                 return -ENODEV;
 238
 239         list_for_each_entry(substream, &s->substreams, list) {
 240                 if (substream->opened) {
 241                         if (stream == SNDRV_RAWMIDI_STREAM_INPUT ||
 242                             !(mode & SNDRV_RAWMIDI_LFLG_APPEND) ||
 243                             !substream->append)
 244                                 continue;
 245                 }
 246                 if (subdevice < 0 || subdevice == substream->number) {
 247                         *sub_ret = substream;
 248                         return 0;
 249                 }
 250         }
 251         return -EAGAIN;
 252 }
 253
 254 /* open and do ref-counting for the given substream */
 255 static int open_substream(struct snd_rawmidi *rmidi,
 256                           struct snd_rawmidi_substream *substream,
 257                           int mode)
 258 {
 259         int err;
 260
 261         if (substream->use_count == 0) {
 262                 err = snd_rawmidi_runtime_create(substream);
 263                 if (err < 0)
 264                         return err;
 265                 err = substream->ops->open(substream);
 266                 if (err < 0) {
 267                         snd_rawmidi_runtime_free(substream);
 268                         return err;
 269                 }
 270                 substream->opened = 1;
 271                 substream->active_sensing = 0;
 272                 if (mode & SNDRV_RAWMIDI_LFLG_APPEND)
 273                         substream->append = 1;
 274                 substream->pid = get_pid(task_pid(current));
 275                 rmidi->streams[substream->stream].substream_opened++;
 276         }
 277         substream->use_count++;
 278         return 0;
 279 }
 280
 281 static void close_substream(struct snd_rawmidi *rmidi,
 282                             struct snd_rawmidi_substream *substream,
 283                             int cleanup);
 284
 285 static int rawmidi_open_priv(struct snd_rawmidi *rmidi, int subdevice, int mode,
 286                              struct snd_rawmidi_file *rfile)
 287 {
 288         struct snd_rawmidi_substream *sinput = NULL, *soutput = NULL;
 289         int err;
 290
 291         rfile->input = rfile->output = NULL;
 292         if (mode & SNDRV_RAWMIDI_LFLG_INPUT) {
 293                 err = assign_substream(rmidi, subdevice,
 294                                        SNDRV_RAWMIDI_STREAM_INPUT,
 295                                        mode, &sinput);
 296                 if (err < 0)
 297                         return err;
 298         }
 299         if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) {
 300                 err = assign_substream(rmidi, subdevice,
 301                                        SNDRV_RAWMIDI_STREAM_OUTPUT,
 302                                        mode, &soutput);
 303                 if (err < 0)
 304                         return err;
 305         }
 306
 307         if (sinput) {
 308                 err = open_substream(rmidi, sinput, mode);
 309                 if (err < 0)
 310                         return err;
 311         }
 312         if (soutput) {
 313                 err = open_substream(rmidi, soutput, mode);
 314                 if (err < 0) {
 315                         if (sinput)
 316                                 close_substream(rmidi, sinput, 0);
 317                         return err;
 318                 }
 319         }
 320
 321         rfile->rmidi = rmidi;
 322         rfile->input = sinput;
 323         rfile->output = soutput;
 324         return 0;
 325 }
 326
 327 /* called from sound/core/seq/seq_midi.c */
 328 int snd_rawmidi_kernel_open(struct snd_card *card, int device, int subdevice,
 329                             int mode, struct snd_rawmidi_file *rfile)
 330 {
 331         struct snd_rawmidi *rmidi;
 332         int err = 0;
 333
 334         if (snd_BUG_ON(!rfile))
 335                 return -EINVAL;
 336
 337         mutex_lock(&register_mutex);
 338         rmidi = snd_rawmidi_search(card, device);
 339         if (!rmidi)
 340                 err = -ENODEV;
 341         else if (!try_module_get(rmidi->card->module))
 342                 err = -ENXIO;
 343         mutex_unlock(&register_mutex);
 344         if (err < 0)
 345                 return err;
 346
 347         mutex_lock(&rmidi->open_mutex);
 348         err = rawmidi_open_priv(rmidi, subdevice, mode, rfile);
 349         mutex_unlock(&rmidi->open_mutex);
 350         if (err < 0)
 351                 module_put(rmidi->card->module);
 352         return err;
 353 }
 354 EXPORT_SYMBOL(snd_rawmidi_kernel_open);
 355
 356 static int snd_rawmidi_open(struct inode *inode, struct file *file)
 357 {
 358         int maj = imajor(inode);
 359         struct snd_card *card;
 360         int subdevice;
 361         unsigned short fflags;
 362         int err;
 363         struct snd_rawmidi *rmidi;
 364         struct snd_rawmidi_file *rawmidi_file = NULL;
 365         wait_queue_entry_t wait;
 366
 367         if ((file->f_flags & O_APPEND) && !(file->f_flags & O_NONBLOCK))
 368                 return -EINVAL;         /* invalid combination */
 369
 370         err = stream_open(inode, file);
 371         if (err < 0)
 372                 return err;
 373
 374         if (maj == snd_major) {
 375                 rmidi = snd_lookup_minor_data(iminor(inode),
 376                                               SNDRV_DEVICE_TYPE_RAWMIDI);
 377 #ifdef CONFIG_SND_OSSEMUL
 378         } else if (maj == SOUND_MAJOR) {
 379                 rmidi = snd_lookup_oss_minor_data(iminor(inode),
 380                                                   SNDRV_OSS_DEVICE_TYPE_MIDI);
 381 #endif
 382         } else
 383                 return -ENXIO;
 384
 385         if (rmidi == NULL)
 386                 return -ENODEV;
 387
 388         if (!try_module_get(rmidi->card->module)) {
 389                 snd_card_unref(rmidi->card);
 390                 return -ENXIO;
 391         }
 392
 393         mutex_lock(&rmidi->open_mutex);
 394         card = rmidi->card;
 395         err = snd_card_file_add(card, file);
 396         if (err < 0)
 397                 goto __error_card;
 398         fflags = snd_rawmidi_file_flags(file);
 399         if ((file->f_flags & O_APPEND) || maj == SOUND_MAJOR) /* OSS emul? */
 400                 fflags |= SNDRV_RAWMIDI_LFLG_APPEND;
 401         rawmidi_file = kmalloc(sizeof(*rawmidi_file), GFP_KERNEL);
 402         if (rawmidi_file == NULL) {
 403                 err = -ENOMEM;
 404                 goto __error;
 405         }
 406         init_waitqueue_entry(&wait, current);
 407         add_wait_queue(&rmidi->open_wait, &wait);
 408         while (1) {
 409                 subdevice = snd_ctl_get_preferred_subdevice(card, SND_CTL_SUBDEV_RAWMIDI);
 410                 err = rawmidi_open_priv(rmidi, subdevice, fflags, rawmidi_file);
 411                 if (err >= 0)
 412                         break;
 413                 if (err == -EAGAIN) {
 414                         if (file->f_flags & O_NONBLOCK) {
 415                                 err = -EBUSY;
 416                                 break;
 417                         }
 418                 } else
 419                         break;
 420                 set_current_state(TASK_INTERRUPTIBLE);
 421                 mutex_unlock(&rmidi->open_mutex);
 422                 schedule();
 423                 mutex_lock(&rmidi->open_mutex);
 424                 if (rmidi->card->shutdown) {
 425                         err = -ENODEV;
 426                         break;
 427                 }
 428                 if (signal_pending(current)) {
 429                         err = -ERESTARTSYS;
 430                         break;
 431                 }
 432         }
 433         remove_wait_queue(&rmidi->open_wait, &wait);
 434         if (err < 0) {
 435                 kfree(rawmidi_file);
 436                 goto __error;
 437         }
 438 #ifdef CONFIG_SND_OSSEMUL
 439         if (rawmidi_file->input && rawmidi_file->input->runtime)
 440                 rawmidi_file->input->runtime->oss = (maj == SOUND_MAJOR);
 441         if (rawmidi_file->output && rawmidi_file->output->runtime)
 442                 rawmidi_file->output->runtime->oss = (maj == SOUND_MAJOR);
 443 #endif
 444         file->private_data = rawmidi_file;
 445         mutex_unlock(&rmidi->open_mutex);
 446         snd_card_unref(rmidi->card);
 447         return 0;
 448
 449  __error:
 450         snd_card_file_remove(card, file);
 451  __error_card:
 452         mutex_unlock(&rmidi->open_mutex);
 453         module_put(rmidi->card->module);
 454         snd_card_unref(rmidi->card);
 455         return err;
 456 }
 457
 458 static void close_substream(struct snd_rawmidi *rmidi,
 459                             struct snd_rawmidi_substream *substream,
 460                             int cleanup)
 461 {
 462         if (--substream->use_count)
 463                 return;
 464
 465         if (cleanup) {
 466                 if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
 467                         snd_rawmidi_input_trigger(substream, 0);
 468                 else {
 469                         if (substream->active_sensing) {
 470                                 unsigned char buf = 0xfe;
 471                                 /* sending single active sensing message
 472                                  * to shut the device up
 473                                  */
 474                                 snd_rawmidi_kernel_write(substream, &buf, 1);
 475                         }
 476                         if (snd_rawmidi_drain_output(substream) == -ERESTARTSYS)
 477                                 snd_rawmidi_output_trigger(substream, 0);
 478                 }
 479         }
 480         substream->ops->close(substream);
 481         if (substream->runtime->private_free)
 482                 substream->runtime->private_free(substream);
 483         snd_rawmidi_runtime_free(substream);
 484         substream->opened = 0;
 485         substream->append = 0;
 486         put_pid(substream->pid);
 487         substream->pid = NULL;
 488         rmidi->streams[substream->stream].substream_opened--;
 489 }
 490
 491 static void rawmidi_release_priv(struct snd_rawmidi_file *rfile)
 492 {
 493         struct snd_rawmidi *rmidi;
 494
 495         rmidi = rfile->rmidi;
 496         mutex_lock(&rmidi->open_mutex);
 497         if (rfile->input) {
 498                 close_substream(rmidi, rfile->input, 1);
 499                 rfile->input = NULL;
 500         }
 501         if (rfile->output) {
 502                 close_substream(rmidi, rfile->output, 1);
 503                 rfile->output = NULL;
 504         }
 505         rfile->rmidi = NULL;
 506         mutex_unlock(&rmidi->open_mutex);
 507         wake_up(&rmidi->open_wait);
 508 }
 509
 510 /* called from sound/core/seq/seq_midi.c */
 511 int snd_rawmidi_kernel_release(struct snd_rawmidi_file *rfile)
 512 {
 513         struct snd_rawmidi *rmidi;
 514
 515         if (snd_BUG_ON(!rfile))
 516                 return -ENXIO;
 517
 518         rmidi = rfile->rmidi;
 519         rawmidi_release_priv(rfile);
 520         module_put(rmidi->card->module);
 521         return 0;
 522 }
 523 EXPORT_SYMBOL(snd_rawmidi_kernel_release);
 524
 525 static int snd_rawmidi_release(struct inode *inode, struct file *file)
 526 {
 527         struct snd_rawmidi_file *rfile;
 528         struct snd_rawmidi *rmidi;
 529         struct module *module;
 530
 531         rfile = file->private_data;
 532         rmidi = rfile->rmidi;
 533         rawmidi_release_priv(rfile);
 534         kfree(rfile);
 535         module = rmidi->card->module;
 536         snd_card_file_remove(rmidi->card, file);
 537         module_put(module);
 538         return 0;
 539 }
 540
 541 static int snd_rawmidi_info(struct snd_rawmidi_substream *substream,
 542                             struct snd_rawmidi_info *info)
 543 {
 544         struct snd_rawmidi *rmidi;
 545
 546         if (substream == NULL)
 547                 return -ENODEV;
 548         rmidi = substream->rmidi;
 549         memset(info, 0, sizeof(*info));
 550         info->card = rmidi->card->number;
 551         info->device = rmidi->device;
 552         info->subdevice = substream->number;
 553         info->stream = substream->stream;
 554         info->flags = rmidi->info_flags;
 555         strcpy(info->id, rmidi->id);
 556         strcpy(info->name, rmidi->name);
 557         strcpy(info->subname, substream->name);
 558         info->subdevices_count = substream->pstr->substream_count;
 559         info->subdevices_avail = (substream->pstr->substream_count -
 560                                   substream->pstr->substream_opened);
 561         return 0;
 562 }
 563
 564 static int snd_rawmidi_info_user(struct snd_rawmidi_substream *substream,
 565                                  struct snd_rawmidi_info __user *_info)
 566 {
 567         struct snd_rawmidi_info info;
 568         int err;
 569
 570         err = snd_rawmidi_info(substream, &info);
 571         if (err < 0)
 572                 return err;
 573         if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
 574                 return -EFAULT;
 575         return 0;
 576 }
 577
 578 static int __snd_rawmidi_info_select(struct snd_card *card,
 579                                      struct snd_rawmidi_info *info)
 580 {
 581         struct snd_rawmidi *rmidi;
 582         struct snd_rawmidi_str *pstr;
 583         struct snd_rawmidi_substream *substream;
 584
 585         rmidi = snd_rawmidi_search(card, info->device);
 586         if (!rmidi)
 587                 return -ENXIO;
 588         if (info->stream < 0 || info->stream > 1)
 589                 return -EINVAL;
 590         info->stream = array_index_nospec(info->stream, 2);
 591         pstr = &rmidi->streams[info->stream];
 592         if (pstr->substream_count == 0)
 593                 return -ENOENT;
 594         if (info->subdevice >= pstr->substream_count)
 595                 return -ENXIO;
 596         list_for_each_entry(substream, &pstr->substreams, list) {
 597                 if ((unsigned int)substream->number == info->subdevice)
 598                         return snd_rawmidi_info(substream, info);
 599         }
 600         return -ENXIO;
 601 }
 602
 603 int snd_rawmidi_info_select(struct snd_card *card, struct snd_rawmidi_info *info)
 604 {
 605         int ret;
 606
 607         mutex_lock(&register_mutex);
 608         ret = __snd_rawmidi_info_select(card, info);
 609         mutex_unlock(&register_mutex);
 610         return ret;
 611 }
 612 EXPORT_SYMBOL(snd_rawmidi_info_select);
 613
 614 static int snd_rawmidi_info_select_user(struct snd_card *card,
 615                                         struct snd_rawmidi_info __user *_info)
 616 {
 617         int err;
 618         struct snd_rawmidi_info info;
 619
 620         if (get_user(info.device, &_info->device))
 621                 return -EFAULT;
 622         if (get_user(info.stream, &_info->stream))
 623                 return -EFAULT;
 624         if (get_user(info.subdevice, &_info->subdevice))
 625                 return -EFAULT;
 626         err = snd_rawmidi_info_select(card, &info);
 627         if (err < 0)
 628                 return err;
 629         if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
 630                 return -EFAULT;
 631         return 0;
 632 }
 633
 634 static int resize_runtime_buffer(struct snd_rawmidi_runtime *runtime,
 635                                  struct snd_rawmidi_params *params,
 636                                  bool is_input)
 637 {
 638         char *newbuf, *oldbuf;
 639
 640         if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L)
 641                 return -EINVAL;
 642         if (params->avail_min < 1 || params->avail_min > params->buffer_size)
 643                 return -EINVAL;
 644         if (params->buffer_size != runtime->buffer_size) {
 645                 newbuf = kvzalloc(params->buffer_size, GFP_KERNEL);
 646                 if (!newbuf)
 647                         return -ENOMEM;
 648                 spin_lock_irq(&runtime->lock);
 649                 oldbuf = runtime->buffer;
 650                 runtime->buffer = newbuf;
 651                 runtime->buffer_size = params->buffer_size;
 652                 __reset_runtime_ptrs(runtime, is_input);
 653                 spin_unlock_irq(&runtime->lock);
 654                 kvfree(oldbuf);
 655         }
 656         runtime->avail_min = params->avail_min;
 657         return 0;
 658 }
 659
 660 int snd_rawmidi_output_params(struct snd_rawmidi_substream *substream,
 661                               struct snd_rawmidi_params *params)
 662 {
 663         if (substream->append && substream->use_count > 1)
 664                 return -EBUSY;
 665         snd_rawmidi_drain_output(substream);
 666         substream->active_sensing = !params->no_active_sensing;
 667         return resize_runtime_buffer(substream->runtime, params, false);
 668 }
 669 EXPORT_SYMBOL(snd_rawmidi_output_params);
 670
 671 int snd_rawmidi_input_params(struct snd_rawmidi_substream *substream,
 672                              struct snd_rawmidi_params *params)
 673 {
 674         snd_rawmidi_drain_input(substream);
 675         return resize_runtime_buffer(substream->runtime, params, true);
 676 }
 677 EXPORT_SYMBOL(snd_rawmidi_input_params);
 678
 679 static int snd_rawmidi_output_status(struct snd_rawmidi_substream *substream,
 680                                      struct snd_rawmidi_status *status)
 681 {
 682         struct snd_rawmidi_runtime *runtime = substream->runtime;
 683
 684         memset(status, 0, sizeof(*status));
 685         status->stream = SNDRV_RAWMIDI_STREAM_OUTPUT;
 686         spin_lock_irq(&runtime->lock);
 687         status->avail = runtime->avail;
 688         spin_unlock_irq(&runtime->lock);
 689         return 0;
 690 }
 691
 692 static int snd_rawmidi_input_status(struct snd_rawmidi_substream *substream,
 693                                     struct snd_rawmidi_status *status)
 694 {
 695         struct snd_rawmidi_runtime *runtime = substream->runtime;
 696
 697         memset(status, 0, sizeof(*status));
 698         status->stream = SNDRV_RAWMIDI_STREAM_INPUT;
 699         spin_lock_irq(&runtime->lock);
 700         status->avail = runtime->avail;
 701         status->xruns = runtime->xruns;
 702         runtime->xruns = 0;
 703         spin_unlock_irq(&runtime->lock);
 704         return 0;
 705 }
 706
 707 static long snd_rawmidi_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 708 {
 709         struct snd_rawmidi_file *rfile;
 710         void __user *argp = (void __user *)arg;
 711
 712         rfile = file->private_data;
 713         if (((cmd >> 8) & 0xff) != 'W')
 714                 return -ENOTTY;
 715         switch (cmd) {
 716         case SNDRV_RAWMIDI_IOCTL_PVERSION:
 717                 return put_user(SNDRV_RAWMIDI_VERSION, (int __user *)argp) ? -EFAULT : 0;
 718         case SNDRV_RAWMIDI_IOCTL_INFO:
 719         {
 720                 int stream;
 721                 struct snd_rawmidi_info __user *info = argp;
 722
 723                 if (get_user(stream, &info->stream))
 724                         return -EFAULT;
 725                 switch (stream) {
 726                 case SNDRV_RAWMIDI_STREAM_INPUT:
 727                         return snd_rawmidi_info_user(rfile->input, info);
 728                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
 729                         return snd_rawmidi_info_user(rfile->output, info);
 730                 default:
 731                         return -EINVAL;
 732                 }
 733         }
 734         case SNDRV_RAWMIDI_IOCTL_PARAMS:
 735         {
 736                 struct snd_rawmidi_params params;
 737
 738                 if (copy_from_user(&params, argp, sizeof(struct snd_rawmidi_params)))
 739                         return -EFAULT;
 740                 switch (params.stream) {
 741                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
 742                         if (rfile->output == NULL)
 743                                 return -EINVAL;
 744                         return snd_rawmidi_output_params(rfile->output, &params);
 745                 case SNDRV_RAWMIDI_STREAM_INPUT:
 746                         if (rfile->input == NULL)
 747                                 return -EINVAL;
 748                         return snd_rawmidi_input_params(rfile->input, &params);
 749                 default:
 750                         return -EINVAL;
 751                 }
 752         }
 753         case SNDRV_RAWMIDI_IOCTL_STATUS:
 754         {
 755                 int err = 0;
 756                 struct snd_rawmidi_status status;
 757
 758                 if (copy_from_user(&status, argp, sizeof(struct snd_rawmidi_status)))
 759                         return -EFAULT;
 760                 switch (status.stream) {
 761                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
 762                         if (rfile->output == NULL)
 763                                 return -EINVAL;
 764                         err = snd_rawmidi_output_status(rfile->output, &status);
 765                         break;
 766                 case SNDRV_RAWMIDI_STREAM_INPUT:
 767                         if (rfile->input == NULL)
 768                                 return -EINVAL;
 769                         err = snd_rawmidi_input_status(rfile->input, &status);
 770                         break;
 771                 default:
 772                         return -EINVAL;
 773                 }
 774                 if (err < 0)
 775                         return err;
 776                 if (copy_to_user(argp, &status, sizeof(struct snd_rawmidi_status)))
 777                         return -EFAULT;
 778                 return 0;
 779         }
 780         case SNDRV_RAWMIDI_IOCTL_DROP:
 781         {
 782                 int val;
 783
 784                 if (get_user(val, (int __user *) argp))
 785                         return -EFAULT;
 786                 switch (val) {
 787                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
 788                         if (rfile->output == NULL)
 789                                 return -EINVAL;
 790                         return snd_rawmidi_drop_output(rfile->output);
 791                 default:
 792                         return -EINVAL;
 793                 }
 794         }
 795         case SNDRV_RAWMIDI_IOCTL_DRAIN:
 796         {
 797                 int val;
 798
 799                 if (get_user(val, (int __user *) argp))
 800                         return -EFAULT;
 801                 switch (val) {
 802                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
 803                         if (rfile->output == NULL)
 804                                 return -EINVAL;
 805                         return snd_rawmidi_drain_output(rfile->output);
 806                 case SNDRV_RAWMIDI_STREAM_INPUT:
 807                         if (rfile->input == NULL)
 808                                 return -EINVAL;
 809                         return snd_rawmidi_drain_input(rfile->input);
 810                 default:
 811                         return -EINVAL;
 812                 }
 813         }
 814         default:
 815                 rmidi_dbg(rfile->rmidi,
 816                           "rawmidi: unknown command = 0x%x\n", cmd);
 817         }
 818         return -ENOTTY;
 819 }
 820
 821 static int snd_rawmidi_control_ioctl(struct snd_card *card,
 822                                      struct snd_ctl_file *control,
 823                                      unsigned int cmd,
 824                                      unsigned long arg)
 825 {
 826         void __user *argp = (void __user *)arg;
 827
 828         switch (cmd) {
 829         case SNDRV_CTL_IOCTL_RAWMIDI_NEXT_DEVICE:
 830         {
 831                 int device;
 832
 833                 if (get_user(device, (int __user *)argp))
 834                         return -EFAULT;
 835                 if (device >= SNDRV_RAWMIDI_DEVICES) /* next device is -1 */
 836                         device = SNDRV_RAWMIDI_DEVICES - 1;
 837                 mutex_lock(&register_mutex);
 838                 device = device < 0 ? 0 : device + 1;
 839                 while (device < SNDRV_RAWMIDI_DEVICES) {
 840                         if (snd_rawmidi_search(card, device))
 841                                 break;
 842                         device++;
 843                 }
 844                 if (device == SNDRV_RAWMIDI_DEVICES)
 845                         device = -1;
 846                 mutex_unlock(&register_mutex);
 847                 if (put_user(device, (int __user *)argp))
 848                         return -EFAULT;
 849                 return 0;
 850         }
 851         case SNDRV_CTL_IOCTL_RAWMIDI_PREFER_SUBDEVICE:
 852         {
 853                 int val;
 854
 855                 if (get_user(val, (int __user *)argp))
 856                         return -EFAULT;
 857                 control->preferred_subdevice[SND_CTL_SUBDEV_RAWMIDI] = val;
 858                 return 0;
 859         }
 860         case SNDRV_CTL_IOCTL_RAWMIDI_INFO:
 861                 return snd_rawmidi_info_select_user(card, argp);
 862         }
 863         return -ENOIOCTLCMD;
 864 }
 865
 866 /**
 867  * snd_rawmidi_receive - receive the input data from the device
 868  * @substream: the rawmidi substream
 869  * @buffer: the buffer pointer
 870  * @count: the data size to read
 871  *
 872  * Reads the data from the internal buffer.
 873  *
 874  * Return: The size of read data, or a negative error code on failure.
 875  */
 876 int snd_rawmidi_receive(struct snd_rawmidi_substream *substream,
 877                         const unsigned char *buffer, int count)
 878 {
 879         unsigned long flags;
 880         int result = 0, count1;
 881         struct snd_rawmidi_runtime *runtime = substream->runtime;
 882
 883         if (!substream->opened)
 884                 return -EBADFD;
 885         if (runtime->buffer == NULL) {
 886                 rmidi_dbg(substream->rmidi,
 887                           "snd_rawmidi_receive: input is not active!!!\n");
 888                 return -EINVAL;
 889         }
 890         spin_lock_irqsave(&runtime->lock, flags);
 891         if (count == 1) {       /* special case, faster code */
 892                 substream->bytes++;
 893                 if (runtime->avail < runtime->buffer_size) {
 894                         runtime->buffer[runtime->hw_ptr++] = buffer[0];
 895                         runtime->hw_ptr %= runtime->buffer_size;
 896                         runtime->avail++;
 897                         result++;
 898                 } else {
 899                         runtime->xruns++;
 900                 }
 901         } else {
 902                 substream->bytes += count;
 903                 count1 = runtime->buffer_size - runtime->hw_ptr;
 904                 if (count1 > count)
 905                         count1 = count;
 906                 if (count1 > (int)(runtime->buffer_size - runtime->avail))
 907                         count1 = runtime->buffer_size - runtime->avail;
 908                 memcpy(runtime->buffer + runtime->hw_ptr, buffer, count1);
 909                 runtime->hw_ptr += count1;
 910                 runtime->hw_ptr %= runtime->buffer_size;
 911                 runtime->avail += count1;
 912                 count -= count1;
 913                 result += count1;
 914                 if (count > 0) {
 915                         buffer += count1;
 916                         count1 = count;
 917                         if (count1 > (int)(runtime->buffer_size - runtime->avail)) {
 918                                 count1 = runtime->buffer_size - runtime->avail;
 919                                 runtime->xruns += count - count1;
 920                         }
 921                         if (count1 > 0) {
 922                                 memcpy(runtime->buffer, buffer, count1);
 923                                 runtime->hw_ptr = count1;
 924                                 runtime->avail += count1;
 925                                 result += count1;
 926                         }
 927                 }
 928         }
 929         if (result > 0) {
 930                 if (runtime->event)
 931                         schedule_work(&runtime->event_work);
 932                 else if (snd_rawmidi_ready(substream))
 933                         wake_up(&runtime->sleep);
 934         }
 935         spin_unlock_irqrestore(&runtime->lock, flags);
 936         return result;
 937 }
 938 EXPORT_SYMBOL(snd_rawmidi_receive);
 939
 940 static long snd_rawmidi_kernel_read1(struct snd_rawmidi_substream *substream,
 941                                      unsigned char __user *userbuf,
 942                                      unsigned char *kernelbuf, long count)
 943 {
 944         unsigned long flags;
 945         long result = 0, count1;
 946         struct snd_rawmidi_runtime *runtime = substream->runtime;
 947         unsigned long appl_ptr;
 948
 949         spin_lock_irqsave(&runtime->lock, flags);
 950         while (count > 0 && runtime->avail) {
 951                 count1 = runtime->buffer_size - runtime->appl_ptr;
 952                 if (count1 > count)
 953                         count1 = count;
 954                 if (count1 > (int)runtime->avail)
 955                         count1 = runtime->avail;
 956
 957                 /* update runtime->appl_ptr before unlocking for userbuf */
 958                 appl_ptr = runtime->appl_ptr;
 959                 runtime->appl_ptr += count1;
 960                 runtime->appl_ptr %= runtime->buffer_size;
 961                 runtime->avail -= count1;
 962
 963                 if (kernelbuf)
 964                         memcpy(kernelbuf + result, runtime->buffer + appl_ptr, count1);
 965                 if (userbuf) {
 966                         spin_unlock_irqrestore(&runtime->lock, flags);
 967                         if (copy_to_user(userbuf + result,
 968                                          runtime->buffer + appl_ptr, count1)) {
 969                                 return result > 0 ? result : -EFAULT;
 970                         }
 971                         spin_lock_irqsave(&runtime->lock, flags);
 972                 }
 973                 result += count1;
 974                 count -= count1;
 975         }
 976         spin_unlock_irqrestore(&runtime->lock, flags);
 977         return result;
 978 }
 979
 980 long snd_rawmidi_kernel_read(struct snd_rawmidi_substream *substream,
 981                              unsigned char *buf, long count)
 982 {
 983         snd_rawmidi_input_trigger(substream, 1);
 984         return snd_rawmidi_kernel_read1(substream, NULL/*userbuf*/, buf, count);
 985 }
 986 EXPORT_SYMBOL(snd_rawmidi_kernel_read);
 987
 988 static ssize_t snd_rawmidi_read(struct file *file, char __user *buf, size_t count,
 989                                 loff_t *offset)
 990 {
 991         long result;
 992         int count1;
 993         struct snd_rawmidi_file *rfile;
 994         struct snd_rawmidi_substream *substream;
 995         struct snd_rawmidi_runtime *runtime;
 996
 997         rfile = file->private_data;
 998         substream = rfile->input;
 999         if (substream == NULL)
1000                 return -EIO;
1001         runtime = substream->runtime;
1002         snd_rawmidi_input_trigger(substream, 1);
1003         result = 0;
1004         while (count > 0) {
1005                 spin_lock_irq(&runtime->lock);
1006                 while (!snd_rawmidi_ready(substream)) {
1007                         wait_queue_entry_t wait;
1008
1009                         if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1010                                 spin_unlock_irq(&runtime->lock);
1011                                 return result > 0 ? result : -EAGAIN;
1012                         }
1013                         init_waitqueue_entry(&wait, current);
1014                         add_wait_queue(&runtime->sleep, &wait);
1015                         set_current_state(TASK_INTERRUPTIBLE);
1016                         spin_unlock_irq(&runtime->lock);
1017                         schedule();
1018                         remove_wait_queue(&runtime->sleep, &wait);
1019                         if (rfile->rmidi->card->shutdown)
1020                                 return -ENODEV;
1021                         if (signal_pending(current))
1022                                 return result > 0 ? result : -ERESTARTSYS;
1023                         if (!runtime->avail)
1024                                 return result > 0 ? result : -EIO;
1025                         spin_lock_irq(&runtime->lock);
1026                 }
1027                 spin_unlock_irq(&runtime->lock);
1028                 count1 = snd_rawmidi_kernel_read1(substream,
1029                                                   (unsigned char __user *)buf,
1030                                                   NULL/*kernelbuf*/,
1031                                                   count);
1032                 if (count1 < 0)
1033                         return result > 0 ? result : count1;
1034                 result += count1;
1035                 buf += count1;
1036                 count -= count1;
1037         }
1038         return result;
1039 }
1040
1041 /**
1042  * snd_rawmidi_transmit_empty - check whether the output buffer is empty
1043  * @substream: the rawmidi substream
1044  *
1045  * Return: 1 if the internal output buffer is empty, 0 if not.
1046  */
1047 int snd_rawmidi_transmit_empty(struct snd_rawmidi_substream *substream)
1048 {
1049         struct snd_rawmidi_runtime *runtime = substream->runtime;
1050         int result;
1051         unsigned long flags;
1052
1053         if (runtime->buffer == NULL) {
1054                 rmidi_dbg(substream->rmidi,
1055                           "snd_rawmidi_transmit_empty: output is not active!!!\n");
1056                 return 1;
1057         }
1058         spin_lock_irqsave(&runtime->lock, flags);
1059         result = runtime->avail >= runtime->buffer_size;
1060         spin_unlock_irqrestore(&runtime->lock, flags);
1061         return result;
1062 }
1063 EXPORT_SYMBOL(snd_rawmidi_transmit_empty);
1064
1065 /**
1066  * __snd_rawmidi_transmit_peek - copy data from the internal buffer
1067  * @substream: the rawmidi substream
1068  * @buffer: the buffer pointer
1069  * @count: data size to transfer
1070  *
1071  * This is a variant of snd_rawmidi_transmit_peek() without spinlock.
1072  */
1073 int __snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
1074                               unsigned char *buffer, int count)
1075 {
1076         int result, count1;
1077         struct snd_rawmidi_runtime *runtime = substream->runtime;
1078
1079         if (runtime->buffer == NULL) {
1080                 rmidi_dbg(substream->rmidi,
1081                           "snd_rawmidi_transmit_peek: output is not active!!!\n");
1082                 return -EINVAL;
1083         }
1084         result = 0;
1085         if (runtime->avail >= runtime->buffer_size) {
1086                 /* warning: lowlevel layer MUST trigger down the hardware */
1087                 goto __skip;
1088         }
1089         if (count == 1) {       /* special case, faster code */
1090                 *buffer = runtime->buffer[runtime->hw_ptr];
1091                 result++;
1092         } else {
1093                 count1 = runtime->buffer_size - runtime->hw_ptr;
1094                 if (count1 > count)
1095                         count1 = count;
1096                 if (count1 > (int)(runtime->buffer_size - runtime->avail))
1097                         count1 = runtime->buffer_size - runtime->avail;
1098                 memcpy(buffer, runtime->buffer + runtime->hw_ptr, count1);
1099                 count -= count1;
1100                 result += count1;
1101                 if (count > 0) {
1102                         if (count > (int)(runtime->buffer_size - runtime->avail - count1))
1103                                 count = runtime->buffer_size - runtime->avail - count1;
1104                         memcpy(buffer + count1, runtime->buffer, count);
1105                         result += count;
1106                 }
1107         }
1108       __skip:
1109         return result;
1110 }
1111 EXPORT_SYMBOL(__snd_rawmidi_transmit_peek);
1112
1113 /**
1114  * snd_rawmidi_transmit_peek - copy data from the internal buffer
1115  * @substream: the rawmidi substream
1116  * @buffer: the buffer pointer
1117  * @count: data size to transfer
1118  *
1119  * Copies data from the internal output buffer to the given buffer.
1120  *
1121  * Call this in the interrupt handler when the midi output is ready,
1122  * and call snd_rawmidi_transmit_ack() after the transmission is
1123  * finished.
1124  *
1125  * Return: The size of copied data, or a negative error code on failure.
1126  */
1127 int snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
1128                               unsigned char *buffer, int count)
1129 {
1130         struct snd_rawmidi_runtime *runtime = substream->runtime;
1131         int result;
1132         unsigned long flags;
1133
1134         spin_lock_irqsave(&runtime->lock, flags);
1135         result = __snd_rawmidi_transmit_peek(substream, buffer, count);
1136         spin_unlock_irqrestore(&runtime->lock, flags);
1137         return result;
1138 }
1139 EXPORT_SYMBOL(snd_rawmidi_transmit_peek);
1140
1141 /**
1142  * __snd_rawmidi_transmit_ack - acknowledge the transmission
1143  * @substream: the rawmidi substream
1144  * @count: the transferred count
1145  *
1146  * This is a variant of __snd_rawmidi_transmit_ack() without spinlock.
1147  */
1148 int __snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count)
1149 {
1150         struct snd_rawmidi_runtime *runtime = substream->runtime;
1151
1152         if (runtime->buffer == NULL) {
1153                 rmidi_dbg(substream->rmidi,
1154                           "snd_rawmidi_transmit_ack: output is not active!!!\n");
1155                 return -EINVAL;
1156         }
1157         snd_BUG_ON(runtime->avail + count > runtime->buffer_size);
1158         runtime->hw_ptr += count;
1159         runtime->hw_ptr %= runtime->buffer_size;
1160         runtime->avail += count;
1161         substream->bytes += count;
1162         if (count > 0) {
1163                 if (runtime->drain || snd_rawmidi_ready(substream))
1164                         wake_up(&runtime->sleep);
1165         }
1166         return count;
1167 }
1168 EXPORT_SYMBOL(__snd_rawmidi_transmit_ack);
1169
1170 /**
1171  * snd_rawmidi_transmit_ack - acknowledge the transmission
1172  * @substream: the rawmidi substream
1173  * @count: the transferred count
1174  *
1175  * Advances the hardware pointer for the internal output buffer with
1176  * the given size and updates the condition.
1177  * Call after the transmission is finished.
1178  *
1179  * Return: The advanced size if successful, or a negative error code on failure.
1180  */
1181 int snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count)
1182 {
1183         struct snd_rawmidi_runtime *runtime = substream->runtime;
1184         int result;
1185         unsigned long flags;
1186
1187         spin_lock_irqsave(&runtime->lock, flags);
1188         result = __snd_rawmidi_transmit_ack(substream, count);
1189         spin_unlock_irqrestore(&runtime->lock, flags);
1190         return result;
1191 }
1192 EXPORT_SYMBOL(snd_rawmidi_transmit_ack);
1193
1194 /**
1195  * snd_rawmidi_transmit - copy from the buffer to the device
1196  * @substream: the rawmidi substream
1197  * @buffer: the buffer pointer
1198  * @count: the data size to transfer
1199  *
1200  * Copies data from the buffer to the device and advances the pointer.
1201  *
1202  * Return: The copied size if successful, or a negative error code on failure.
1203  */
1204 int snd_rawmidi_transmit(struct snd_rawmidi_substream *substream,
1205                          unsigned char *buffer, int count)
1206 {
1207         struct snd_rawmidi_runtime *runtime = substream->runtime;
1208         int result;
1209         unsigned long flags;
1210
1211         spin_lock_irqsave(&runtime->lock, flags);
1212         if (!substream->opened)
1213                 result = -EBADFD;
1214         else {
1215                 count = __snd_rawmidi_transmit_peek(substream, buffer, count);
1216                 if (count <= 0)
1217                         result = count;
1218                 else
1219                         result = __snd_rawmidi_transmit_ack(substream, count);
1220         }
1221         spin_unlock_irqrestore(&runtime->lock, flags);
1222         return result;
1223 }
1224 EXPORT_SYMBOL(snd_rawmidi_transmit);
1225
1226 /**
1227  * snd_rawmidi_proceed - Discard the all pending bytes and proceed
1228  * @substream: rawmidi substream
1229  *
1230  * Return: the number of discarded bytes
1231  */
1232 int snd_rawmidi_proceed(struct snd_rawmidi_substream *substream)
1233 {
1234         struct snd_rawmidi_runtime *runtime = substream->runtime;
1235         unsigned long flags;
1236         int count = 0;
1237
1238         spin_lock_irqsave(&runtime->lock, flags);
1239         if (runtime->avail < runtime->buffer_size) {
1240                 count = runtime->buffer_size - runtime->avail;
1241                 __snd_rawmidi_transmit_ack(substream, count);
1242         }
1243         spin_unlock_irqrestore(&runtime->lock, flags);
1244         return count;
1245 }
1246 EXPORT_SYMBOL(snd_rawmidi_proceed);
1247
1248 static long snd_rawmidi_kernel_write1(struct snd_rawmidi_substream *substream,
1249                                       const unsigned char __user *userbuf,
1250                                       const unsigned char *kernelbuf,
1251                                       long count)
1252 {
1253         unsigned long flags;
1254         long count1, result;
1255         struct snd_rawmidi_runtime *runtime = substream->runtime;
1256         unsigned long appl_ptr;
1257
1258         if (!kernelbuf && !userbuf)
1259                 return -EINVAL;
1260         if (snd_BUG_ON(!runtime->buffer))
1261                 return -EINVAL;
1262
1263         result = 0;
1264         spin_lock_irqsave(&runtime->lock, flags);
1265         if (substream->append) {
1266                 if ((long)runtime->avail < count) {
1267                         spin_unlock_irqrestore(&runtime->lock, flags);
1268                         return -EAGAIN;
1269                 }
1270         }
1271         while (count > 0 && runtime->avail > 0) {
1272                 count1 = runtime->buffer_size - runtime->appl_ptr;
1273                 if (count1 > count)
1274                         count1 = count;
1275                 if (count1 > (long)runtime->avail)
1276                         count1 = runtime->avail;
1277
1278                 /* update runtime->appl_ptr before unlocking for userbuf */
1279                 appl_ptr = runtime->appl_ptr;
1280                 runtime->appl_ptr += count1;
1281                 runtime->appl_ptr %= runtime->buffer_size;
1282                 runtime->avail -= count1;
1283
1284                 if (kernelbuf)
1285                         memcpy(runtime->buffer + appl_ptr,
1286                                kernelbuf + result, count1);
1287                 else if (userbuf) {
1288                         spin_unlock_irqrestore(&runtime->lock, flags);
1289                         if (copy_from_user(runtime->buffer + appl_ptr,
1290                                            userbuf + result, count1)) {
1291                                 spin_lock_irqsave(&runtime->lock, flags);
1292                                 result = result > 0 ? result : -EFAULT;
1293                                 goto __end;
1294                         }
1295                         spin_lock_irqsave(&runtime->lock, flags);
1296                 }
1297                 result += count1;
1298                 count -= count1;
1299         }
1300       __end:
1301         count1 = runtime->avail < runtime->buffer_size;
1302         spin_unlock_irqrestore(&runtime->lock, flags);
1303         if (count1)
1304                 snd_rawmidi_output_trigger(substream, 1);
1305         return result;
1306 }
1307
1308 long snd_rawmidi_kernel_write(struct snd_rawmidi_substream *substream,
1309                               const unsigned char *buf, long count)
1310 {
1311         return snd_rawmidi_kernel_write1(substream, NULL, buf, count);
1312 }
1313 EXPORT_SYMBOL(snd_rawmidi_kernel_write);
1314
1315 static ssize_t snd_rawmidi_write(struct file *file, const char __user *buf,
1316                                  size_t count, loff_t *offset)
1317 {
1318         long result, timeout;
1319         int count1;
1320         struct snd_rawmidi_file *rfile;
1321         struct snd_rawmidi_runtime *runtime;
1322         struct snd_rawmidi_substream *substream;
1323
1324         rfile = file->private_data;
1325         substream = rfile->output;
1326         runtime = substream->runtime;
1327         /* we cannot put an atomic message to our buffer */
1328         if (substream->append && count > runtime->buffer_size)
1329                 return -EIO;
1330         result = 0;
1331         while (count > 0) {
1332                 spin_lock_irq(&runtime->lock);
1333                 while (!snd_rawmidi_ready_append(substream, count)) {
1334                         wait_queue_entry_t wait;
1335
1336                         if (file->f_flags & O_NONBLOCK) {
1337                                 spin_unlock_irq(&runtime->lock);
1338                                 return result > 0 ? result : -EAGAIN;
1339                         }
1340                         init_waitqueue_entry(&wait, current);
1341                         add_wait_queue(&runtime->sleep, &wait);
1342                         set_current_state(TASK_INTERRUPTIBLE);
1343                         spin_unlock_irq(&runtime->lock);
1344                         timeout = schedule_timeout(30 * HZ);
1345                         remove_wait_queue(&runtime->sleep, &wait);
1346                         if (rfile->rmidi->card->shutdown)
1347                                 return -ENODEV;
1348                         if (signal_pending(current))
1349                                 return result > 0 ? result : -ERESTARTSYS;
1350                         if (!runtime->avail && !timeout)
1351                                 return result > 0 ? result : -EIO;
1352                         spin_lock_irq(&runtime->lock);
1353                 }
1354                 spin_unlock_irq(&runtime->lock);
1355                 count1 = snd_rawmidi_kernel_write1(substream, buf, NULL, count);
1356                 if (count1 < 0)
1357                         return result > 0 ? result : count1;
1358                 result += count1;
1359                 buf += count1;
1360                 if ((size_t)count1 < count && (file->f_flags & O_NONBLOCK))
1361                         break;
1362                 count -= count1;
1363         }
1364         if (file->f_flags & O_DSYNC) {
1365                 spin_lock_irq(&runtime->lock);
1366                 while (runtime->avail != runtime->buffer_size) {
1367                         wait_queue_entry_t wait;
1368                         unsigned int last_avail = runtime->avail;
1369
1370                         init_waitqueue_entry(&wait, current);
1371                         add_wait_queue(&runtime->sleep, &wait);
1372                         set_current_state(TASK_INTERRUPTIBLE);
1373                         spin_unlock_irq(&runtime->lock);
1374                         timeout = schedule_timeout(30 * HZ);
1375                         remove_wait_queue(&runtime->sleep, &wait);
1376                         if (signal_pending(current))
1377                                 return result > 0 ? result : -ERESTARTSYS;
1378                         if (runtime->avail == last_avail && !timeout)
1379                                 return result > 0 ? result : -EIO;
1380                         spin_lock_irq(&runtime->lock);
1381                 }
1382                 spin_unlock_irq(&runtime->lock);
1383         }
1384         return result;
1385 }
1386
1387 static __poll_t snd_rawmidi_poll(struct file *file, poll_table *wait)
1388 {
1389         struct snd_rawmidi_file *rfile;
1390         struct snd_rawmidi_runtime *runtime;
1391         __poll_t mask;
1392
1393         rfile = file->private_data;
1394         if (rfile->input != NULL) {
1395                 runtime = rfile->input->runtime;
1396                 snd_rawmidi_input_trigger(rfile->input, 1);
1397                 poll_wait(file, &runtime->sleep, wait);
1398         }
1399         if (rfile->output != NULL) {
1400                 runtime = rfile->output->runtime;
1401                 poll_wait(file, &runtime->sleep, wait);
1402         }
1403         mask = 0;
1404         if (rfile->input != NULL) {
1405                 if (snd_rawmidi_ready(rfile->input))
1406                         mask |= EPOLLIN | EPOLLRDNORM;
1407         }
1408         if (rfile->output != NULL) {
1409                 if (snd_rawmidi_ready(rfile->output))
1410                         mask |= EPOLLOUT | EPOLLWRNORM;
1411         }
1412         return mask;
1413 }
1414
1415 /*
1416  */
1417 #ifdef CONFIG_COMPAT
1418 #include "rawmidi_compat.c"
1419 #else
1420 #define snd_rawmidi_ioctl_compat        NULL
1421 #endif
1422
1423 /*
1424  */
1425
1426 static void snd_rawmidi_proc_info_read(struct snd_info_entry *entry,
1427                                        struct snd_info_buffer *buffer)
1428 {
1429         struct snd_rawmidi *rmidi;
1430         struct snd_rawmidi_substream *substream;
1431         struct snd_rawmidi_runtime *runtime;
1432
1433         rmidi = entry->private_data;
1434         snd_iprintf(buffer, "%s\n\n", rmidi->name);
1435         mutex_lock(&rmidi->open_mutex);
1436         if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_OUTPUT) {
1437                 list_for_each_entry(substream,
1438                                     &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams,
1439                                     list) {
1440                         snd_iprintf(buffer,
1441                                     "Output %d\n"
1442                                     "  Tx bytes     : %lu\n",
1443                                     substream->number,
1444                                     (unsigned long) substream->bytes);
1445                         if (substream->opened) {
1446                                 snd_iprintf(buffer,
1447                                     "  Owner PID    : %d\n",
1448                                     pid_vnr(substream->pid));
1449                                 runtime = substream->runtime;
1450                                 snd_iprintf(buffer,
1451                                     "  Mode         : %s\n"
1452                                     "  Buffer size  : %lu\n"
1453                                     "  Avail        : %lu\n",
1454                                     runtime->oss ? "OSS compatible" : "native",
1455                                     (unsigned long) runtime->buffer_size,
1456                                     (unsigned long) runtime->avail);
1457                         }
1458                 }
1459         }
1460         if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_INPUT) {
1461                 list_for_each_entry(substream,
1462                                     &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams,
1463                                     list) {
1464                         snd_iprintf(buffer,
1465                                     "Input %d\n"
1466                                     "  Rx bytes     : %lu\n",
1467                                     substream->number,
1468                                     (unsigned long) substream->bytes);
1469                         if (substream->opened) {
1470                                 snd_iprintf(buffer,
1471                                             "  Owner PID    : %d\n",
1472                                             pid_vnr(substream->pid));
1473                                 runtime = substream->runtime;
1474                                 snd_iprintf(buffer,
1475                                             "  Buffer size  : %lu\n"
1476                                             "  Avail        : %lu\n"
1477                                             "  Overruns     : %lu\n",
1478                                             (unsigned long) runtime->buffer_size,
1479                                             (unsigned long) runtime->avail,
1480                                             (unsigned long) runtime->xruns);
1481                         }
1482                 }
1483         }
1484         mutex_unlock(&rmidi->open_mutex);
1485 }
1486
1487 /*
1488  *  Register functions
1489  */
1490
1491 static const struct file_operations snd_rawmidi_f_ops = {
1492         .owner =        THIS_MODULE,
1493         .read =         snd_rawmidi_read,
1494         .write =        snd_rawmidi_write,
1495         .open =         snd_rawmidi_open,
1496         .release =      snd_rawmidi_release,
1497         .llseek =       no_llseek,
1498         .poll =         snd_rawmidi_poll,
1499         .unlocked_ioctl =       snd_rawmidi_ioctl,
1500         .compat_ioctl = snd_rawmidi_ioctl_compat,
1501 };
1502
1503 static int snd_rawmidi_alloc_substreams(struct snd_rawmidi *rmidi,
1504                                         struct snd_rawmidi_str *stream,
1505                                         int direction,
1506                                         int count)
1507 {
1508         struct snd_rawmidi_substream *substream;
1509         int idx;
1510
1511         for (idx = 0; idx < count; idx++) {
1512                 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
1513                 if (!substream)
1514                         return -ENOMEM;
1515                 substream->stream = direction;
1516                 substream->number = idx;
1517                 substream->rmidi = rmidi;
1518                 substream->pstr = stream;
1519                 list_add_tail(&substream->list, &stream->substreams);
1520                 stream->substream_count++;
1521         }
1522         return 0;
1523 }
1524
1525 static void release_rawmidi_device(struct device *dev)
1526 {
1527         kfree(container_of(dev, struct snd_rawmidi, dev));
1528 }
1529
1530 /**
1531  * snd_rawmidi_new - create a rawmidi instance
1532  * @card: the card instance
1533  * @id: the id string
1534  * @device: the device index
1535  * @output_count: the number of output streams
1536  * @input_count: the number of input streams
1537  * @rrawmidi: the pointer to store the new rawmidi instance
1538  *
1539  * Creates a new rawmidi instance.
1540  * Use snd_rawmidi_set_ops() to set the operators to the new instance.
1541  *
1542  * Return: Zero if successful, or a negative error code on failure.
1543  */
1544 int snd_rawmidi_new(struct snd_card *card, char *id, int device,
1545                     int output_count, int input_count,
1546                     struct snd_rawmidi **rrawmidi)
1547 {
1548         struct snd_rawmidi *rmidi;
1549         int err;
1550         static struct snd_device_ops ops = {
1551                 .dev_free = snd_rawmidi_dev_free,
1552                 .dev_register = snd_rawmidi_dev_register,
1553                 .dev_disconnect = snd_rawmidi_dev_disconnect,
1554         };
1555
1556         if (snd_BUG_ON(!card))
1557                 return -ENXIO;
1558         if (rrawmidi)
1559                 *rrawmidi = NULL;
1560         rmidi = kzalloc(sizeof(*rmidi), GFP_KERNEL);
1561         if (!rmidi)
1562                 return -ENOMEM;
1563         rmidi->card = card;
1564         rmidi->device = device;
1565         mutex_init(&rmidi->open_mutex);
1566         init_waitqueue_head(&rmidi->open_wait);
1567         INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams);
1568         INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams);
1569
1570         if (id != NULL)
1571                 strlcpy(rmidi->id, id, sizeof(rmidi->id));
1572
1573         snd_device_initialize(&rmidi->dev, card);
1574         rmidi->dev.release = release_rawmidi_device;
1575         dev_set_name(&rmidi->dev, "midiC%iD%i", card->number, device);
1576
1577         err = snd_rawmidi_alloc_substreams(rmidi,
1578                                            &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT],
1579                                            SNDRV_RAWMIDI_STREAM_INPUT,
1580                                            input_count);
1581         if (err < 0)
1582                 goto error;
1583         err = snd_rawmidi_alloc_substreams(rmidi,
1584                                            &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT],
1585                                            SNDRV_RAWMIDI_STREAM_OUTPUT,
1586                                            output_count);
1587         if (err < 0)
1588                 goto error;
1589         err = snd_device_new(card, SNDRV_DEV_RAWMIDI, rmidi, &ops);
1590         if (err < 0)
1591                 goto error;
1592
1593         if (rrawmidi)
1594                 *rrawmidi = rmidi;
1595         return 0;
1596
1597  error:
1598         snd_rawmidi_free(rmidi);
1599         return err;
1600 }
1601 EXPORT_SYMBOL(snd_rawmidi_new);
1602
1603 static void snd_rawmidi_free_substreams(struct snd_rawmidi_str *stream)
1604 {
1605         struct snd_rawmidi_substream *substream;
1606
1607         while (!list_empty(&stream->substreams)) {
1608                 substream = list_entry(stream->substreams.next, struct snd_rawmidi_substream, list);
1609                 list_del(&substream->list);
1610                 kfree(substream);
1611         }
1612 }
1613
1614 static int snd_rawmidi_free(struct snd_rawmidi *rmidi)
1615 {
1616         if (!rmidi)
1617                 return 0;
1618
1619         snd_info_free_entry(rmidi->proc_entry);
1620         rmidi->proc_entry = NULL;
1621         mutex_lock(&register_mutex);
1622         if (rmidi->ops && rmidi->ops->dev_unregister)
1623                 rmidi->ops->dev_unregister(rmidi);
1624         mutex_unlock(&register_mutex);
1625
1626         snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT]);
1627         snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT]);
1628         if (rmidi->private_free)
1629                 rmidi->private_free(rmidi);
1630         put_device(&rmidi->dev);
1631         return 0;
1632 }
1633
1634 static int snd_rawmidi_dev_free(struct snd_device *device)
1635 {
1636         struct snd_rawmidi *rmidi = device->device_data;
1637
1638         return snd_rawmidi_free(rmidi);
1639 }
1640
1641 #if IS_ENABLED(CONFIG_SND_SEQUENCER)
1642 static void snd_rawmidi_dev_seq_free(struct snd_seq_device *device)
1643 {
1644         struct snd_rawmidi *rmidi = device->private_data;
1645
1646         rmidi->seq_dev = NULL;
1647 }
1648 #endif
1649
1650 static int snd_rawmidi_dev_register(struct snd_device *device)
1651 {
1652         int err;
1653         struct snd_info_entry *entry;
1654         char name[16];
1655         struct snd_rawmidi *rmidi = device->device_data;
1656
1657         if (rmidi->device >= SNDRV_RAWMIDI_DEVICES)
1658                 return -ENOMEM;
1659         err = 0;
1660         mutex_lock(&register_mutex);
1661         if (snd_rawmidi_search(rmidi->card, rmidi->device))
1662                 err = -EBUSY;
1663         else
1664                 list_add_tail(&rmidi->list, &snd_rawmidi_devices);
1665         mutex_unlock(&register_mutex);
1666         if (err < 0)
1667                 return err;
1668
1669         err = snd_register_device(SNDRV_DEVICE_TYPE_RAWMIDI,
1670                                   rmidi->card, rmidi->device,
1671                                   &snd_rawmidi_f_ops, rmidi, &rmidi->dev);
1672         if (err < 0) {
1673                 rmidi_err(rmidi, "unable to register\n");
1674                 goto error;
1675         }
1676         if (rmidi->ops && rmidi->ops->dev_register) {
1677                 err = rmidi->ops->dev_register(rmidi);
1678                 if (err < 0)
1679                         goto error_unregister;
1680         }
1681 #ifdef CONFIG_SND_OSSEMUL
1682         rmidi->ossreg = 0;
1683         if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1684                 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1685                                             rmidi->card, 0, &snd_rawmidi_f_ops,
1686                                             rmidi) < 0) {
1687                         rmidi_err(rmidi,
1688                                   "unable to register OSS rawmidi device %i:%i\n",
1689                                   rmidi->card->number, 0);
1690                 } else {
1691                         rmidi->ossreg++;
1692 #ifdef SNDRV_OSS_INFO_DEV_MIDI
1693                         snd_oss_info_register(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number, rmidi->name);
1694 #endif
1695                 }
1696         }
1697         if ((int)rmidi->device == amidi_map[rmidi->card->number]) {
1698                 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1699                                             rmidi->card, 1, &snd_rawmidi_f_ops,
1700                                             rmidi) < 0) {
1701                         rmidi_err(rmidi,
1702                                   "unable to register OSS rawmidi device %i:%i\n",
1703                                   rmidi->card->number, 1);
1704                 } else {
1705                         rmidi->ossreg++;
1706                 }
1707         }
1708 #endif /* CONFIG_SND_OSSEMUL */
1709         sprintf(name, "midi%d", rmidi->device);
1710         entry = snd_info_create_card_entry(rmidi->card, name, rmidi->card->proc_root);
1711         if (entry) {
1712                 entry->private_data = rmidi;
1713                 entry->c.text.read = snd_rawmidi_proc_info_read;
1714                 if (snd_info_register(entry) < 0) {
1715                         snd_info_free_entry(entry);
1716                         entry = NULL;
1717                 }
1718         }
1719         rmidi->proc_entry = entry;
1720 #if IS_ENABLED(CONFIG_SND_SEQUENCER)
1721         if (!rmidi->ops || !rmidi->ops->dev_register) { /* own registration mechanism */
1722                 if (snd_seq_device_new(rmidi->card, rmidi->device, SNDRV_SEQ_DEV_ID_MIDISYNTH, 0, &rmidi->seq_dev) >= 0) {
1723                         rmidi->seq_dev->private_data = rmidi;
1724                         rmidi->seq_dev->private_free = snd_rawmidi_dev_seq_free;
1725                         sprintf(rmidi->seq_dev->name, "MIDI %d-%d", rmidi->card->number, rmidi->device);
1726                         snd_device_register(rmidi->card, rmidi->seq_dev);
1727                 }
1728         }
1729 #endif
1730         return 0;
1731
1732  error_unregister:
1733         snd_unregister_device(&rmidi->dev);
1734  error:
1735         mutex_lock(&register_mutex);
1736         list_del(&rmidi->list);
1737         mutex_unlock(&register_mutex);
1738         return err;
1739 }
1740
1741 static int snd_rawmidi_dev_disconnect(struct snd_device *device)
1742 {
1743         struct snd_rawmidi *rmidi = device->device_data;
1744         int dir;
1745
1746         mutex_lock(&register_mutex);
1747         mutex_lock(&rmidi->open_mutex);
1748         wake_up(&rmidi->open_wait);
1749         list_del_init(&rmidi->list);
1750         for (dir = 0; dir < 2; dir++) {
1751                 struct snd_rawmidi_substream *s;
1752
1753                 list_for_each_entry(s, &rmidi->streams[dir].substreams, list) {
1754                         if (s->runtime)
1755                                 wake_up(&s->runtime->sleep);
1756                 }
1757         }
1758
1759 #ifdef CONFIG_SND_OSSEMUL
1760         if (rmidi->ossreg) {
1761                 if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1762                         snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 0);
1763 #ifdef SNDRV_OSS_INFO_DEV_MIDI
1764                         snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number);
1765 #endif
1766                 }
1767                 if ((int)rmidi->device == amidi_map[rmidi->card->number])
1768                         snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 1);
1769                 rmidi->ossreg = 0;
1770         }
1771 #endif /* CONFIG_SND_OSSEMUL */
1772         snd_unregister_device(&rmidi->dev);
1773         mutex_unlock(&rmidi->open_mutex);
1774         mutex_unlock(&register_mutex);
1775         return 0;
1776 }
1777
1778 /**
1779  * snd_rawmidi_set_ops - set the rawmidi operators
1780  * @rmidi: the rawmidi instance
1781  * @stream: the stream direction, SNDRV_RAWMIDI_STREAM_XXX
1782  * @ops: the operator table
1783  *
1784  * Sets the rawmidi operators for the given stream direction.
1785  */
1786 void snd_rawmidi_set_ops(struct snd_rawmidi *rmidi, int stream,
1787                          const struct snd_rawmidi_ops *ops)
1788 {
1789         struct snd_rawmidi_substream *substream;
1790
1791         list_for_each_entry(substream, &rmidi->streams[stream].substreams, list)
1792                 substream->ops = ops;
1793 }
1794 EXPORT_SYMBOL(snd_rawmidi_set_ops);
1795
1796 /*
1797  *  ENTRY functions
1798  */
1799
1800 static int __init alsa_rawmidi_init(void)
1801 {
1802
1803         snd_ctl_register_ioctl(snd_rawmidi_control_ioctl);
1804         snd_ctl_register_ioctl_compat(snd_rawmidi_control_ioctl);
1805 #ifdef CONFIG_SND_OSSEMUL
1806         { int i;
1807         /* check device map table */
1808         for (i = 0; i < SNDRV_CARDS; i++) {
1809                 if (midi_map[i] < 0 || midi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1810                         pr_err("ALSA: rawmidi: invalid midi_map[%d] = %d\n",
1811                                i, midi_map[i]);
1812                         midi_map[i] = 0;
1813                 }
1814                 if (amidi_map[i] < 0 || amidi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1815                         pr_err("ALSA: rawmidi: invalid amidi_map[%d] = %d\n",
1816                                i, amidi_map[i]);
1817                         amidi_map[i] = 1;
1818                 }
1819         }
1820         }
1821 #endif /* CONFIG_SND_OSSEMUL */
1822         return 0;
1823 }
1824
1825 static void __exit alsa_rawmidi_exit(void)
1826 {
1827         snd_ctl_unregister_ioctl(snd_rawmidi_control_ioctl);
1828         snd_ctl_unregister_ioctl_compat(snd_rawmidi_control_ioctl);
1829 }
1830
1831 module_init(alsa_rawmidi_init)
1832 module_exit(alsa_rawmidi_exit)