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 <linux/mm.h>
  33 #include <linux/nospec.h>
  34 #include <sound/rawmidi.h>
  35 #include <sound/info.h>
  36 #include <sound/control.h>
  37 #include <sound/minors.h>
  38 #include <sound/initval.h>
  39
  40 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
  41 MODULE_DESCRIPTION("Midlevel RawMidi code for ALSA.");
  42 MODULE_LICENSE("GPL");
  43
  44 #ifdef CONFIG_SND_OSSEMUL
  45 static int midi_map[SNDRV_CARDS];
  46 static int amidi_map[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS-1)] = 1};
  47 module_param_array(midi_map, int, NULL, 0444);
  48 MODULE_PARM_DESC(midi_map, "Raw MIDI device number assigned to 1st OSS device.");
  49 module_param_array(amidi_map, int, NULL, 0444);
  50 MODULE_PARM_DESC(amidi_map, "Raw MIDI device number assigned to 2nd OSS device.");
  51 #endif /* CONFIG_SND_OSSEMUL */
  52
  53 static int snd_rawmidi_free(struct snd_rawmidi *rawmidi);
  54 static int snd_rawmidi_dev_free(struct snd_device *device);
  55 static int snd_rawmidi_dev_register(struct snd_device *device);
  56 static int snd_rawmidi_dev_disconnect(struct snd_device *device);
  57
  58 static LIST_HEAD(snd_rawmidi_devices);
  59 static DEFINE_MUTEX(register_mutex);
  60
  61 #define rmidi_err(rmidi, fmt, args...) \
  62         dev_err(&(rmidi)->dev, fmt, ##args)
  63 #define rmidi_warn(rmidi, fmt, args...) \
  64         dev_warn(&(rmidi)->dev, fmt, ##args)
  65 #define rmidi_dbg(rmidi, fmt, args...) \
  66         dev_dbg(&(rmidi)->dev, fmt, ##args)
  67
  68 static struct snd_rawmidi *snd_rawmidi_search(struct snd_card *card, int device)
  69 {
  70         struct snd_rawmidi *rawmidi;
  71
  72         list_for_each_entry(rawmidi, &snd_rawmidi_devices, list)
  73                 if (rawmidi->card == card && rawmidi->device == device)
  74                         return rawmidi;
  75         return NULL;
  76 }
  77
  78 static inline unsigned short snd_rawmidi_file_flags(struct file *file)
  79 {
  80         switch (file->f_mode & (FMODE_READ | FMODE_WRITE)) {
  81         case FMODE_WRITE:
  82                 return SNDRV_RAWMIDI_LFLG_OUTPUT;
  83         case FMODE_READ:
  84                 return SNDRV_RAWMIDI_LFLG_INPUT;
  85         default:
  86                 return SNDRV_RAWMIDI_LFLG_OPEN;
  87         }
  88 }
  89
  90 static inline int snd_rawmidi_ready(struct snd_rawmidi_substream *substream)
  91 {
  92         struct snd_rawmidi_runtime *runtime = substream->runtime;
  93
  94         return runtime->avail >= runtime->avail_min;
  95 }
  96
  97 static inline int snd_rawmidi_ready_append(struct snd_rawmidi_substream *substream,
  98                                            size_t count)
  99 {
 100         struct snd_rawmidi_runtime *runtime = substream->runtime;
 101
 102         return runtime->avail >= runtime->avail_min &&
 103                (!substream->append || runtime->avail >= count);
 104 }
 105
 106 static void snd_rawmidi_input_event_work(struct work_struct *work)
 107 {
 108         struct snd_rawmidi_runtime *runtime =
 109                 container_of(work, struct snd_rawmidi_runtime, event_work);
 110
 111         if (runtime->event)
 112                 runtime->event(runtime->substream);
 113 }
 114
 115 static int snd_rawmidi_runtime_create(struct snd_rawmidi_substream *substream)
 116 {
 117         struct snd_rawmidi_runtime *runtime;
 118
 119         runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
 120         if (!runtime)
 121                 return -ENOMEM;
 122         runtime->substream = substream;
 123         spin_lock_init(&runtime->lock);
 124         init_waitqueue_head(&runtime->sleep);
 125         INIT_WORK(&runtime->event_work, snd_rawmidi_input_event_work);
 126         runtime->event = NULL;
 127         runtime->buffer_size = PAGE_SIZE;
 128         runtime->avail_min = 1;
 129         if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
 130                 runtime->avail = 0;
 131         else
 132                 runtime->avail = runtime->buffer_size;
 133         runtime->buffer = kvzalloc(runtime->buffer_size, GFP_KERNEL);
 134         if (!runtime->buffer) {
 135                 kfree(runtime);
 136                 return -ENOMEM;
 137         }
 138         runtime->appl_ptr = runtime->hw_ptr = 0;
 139         substream->runtime = runtime;
 140         return 0;
 141 }
 142
 143 static int snd_rawmidi_runtime_free(struct snd_rawmidi_substream *substream)
 144 {
 145         struct snd_rawmidi_runtime *runtime = substream->runtime;
 146
 147         kvfree(runtime->buffer);
 148         kfree(runtime);
 149         substream->runtime = NULL;
 150         return 0;
 151 }
 152
 153 static inline void snd_rawmidi_output_trigger(struct snd_rawmidi_substream *substream, int up)
 154 {
 155         if (!substream->opened)
 156                 return;
 157         substream->ops->trigger(substream, up);
 158 }
 159
 160 static void snd_rawmidi_input_trigger(struct snd_rawmidi_substream *substream, int up)
 161 {
 162         if (!substream->opened)
 163                 return;
 164         substream->ops->trigger(substream, up);
 165         if (!up)
 166                 cancel_work_sync(&substream->runtime->event_work);
 167 }
 168
 169 static void __reset_runtime_ptrs(struct snd_rawmidi_runtime *runtime,
 170                                  bool is_input)
 171 {
 172         runtime->drain = 0;
 173         runtime->appl_ptr = runtime->hw_ptr = 0;
 174         runtime->avail = is_input ? 0 : runtime->buffer_size;
 175 }
 176
 177 static void reset_runtime_ptrs(struct snd_rawmidi_runtime *runtime,
 178                                bool is_input)
 179 {
 180         unsigned long flags;
 181
 182         spin_lock_irqsave(&runtime->lock, flags);
 183         __reset_runtime_ptrs(runtime, is_input);
 184         spin_unlock_irqrestore(&runtime->lock, flags);
 185 }
 186
 187 int snd_rawmidi_drop_output(struct snd_rawmidi_substream *substream)
 188 {
 189         snd_rawmidi_output_trigger(substream, 0);
 190         reset_runtime_ptrs(substream->runtime, false);
 191         return 0;
 192 }
 193 EXPORT_SYMBOL(snd_rawmidi_drop_output);
 194
 195 int snd_rawmidi_drain_output(struct snd_rawmidi_substream *substream)
 196 {
 197         int err;
 198         long timeout;
 199         struct snd_rawmidi_runtime *runtime = substream->runtime;
 200
 201         err = 0;
 202         runtime->drain = 1;
 203         timeout = wait_event_interruptible_timeout(runtime->sleep,
 204                                 (runtime->avail >= runtime->buffer_size),
 205                                 10*HZ);
 206         if (signal_pending(current))
 207                 err = -ERESTARTSYS;
 208         if (runtime->avail < runtime->buffer_size && !timeout) {
 209                 rmidi_warn(substream->rmidi,
 210                            "rawmidi drain error (avail = %li, buffer_size = %li)\n",
 211                            (long)runtime->avail, (long)runtime->buffer_size);
 212                 err = -EIO;
 213         }
 214         runtime->drain = 0;
 215         if (err != -ERESTARTSYS) {
 216                 /* we need wait a while to make sure that Tx FIFOs are empty */
 217                 if (substream->ops->drain)
 218                         substream->ops->drain(substream);
 219                 else
 220                         msleep(50);
 221                 snd_rawmidi_drop_output(substream);
 222         }
 223         return err;
 224 }
 225 EXPORT_SYMBOL(snd_rawmidi_drain_output);
 226
 227 int snd_rawmidi_drain_input(struct snd_rawmidi_substream *substream)
 228 {
 229         snd_rawmidi_input_trigger(substream, 0);
 230         reset_runtime_ptrs(substream->runtime, true);
 231         return 0;
 232 }
 233 EXPORT_SYMBOL(snd_rawmidi_drain_input);
 234
 235 /* look for an available substream for the given stream direction;
 236  * if a specific subdevice is given, try to assign it
 237  */
 238 static int assign_substream(struct snd_rawmidi *rmidi, int subdevice,
 239                             int stream, int mode,
 240                             struct snd_rawmidi_substream **sub_ret)
 241 {
 242         struct snd_rawmidi_substream *substream;
 243         struct snd_rawmidi_str *s = &rmidi->streams[stream];
 244         static unsigned int info_flags[2] = {
 245                 [SNDRV_RAWMIDI_STREAM_OUTPUT] = SNDRV_RAWMIDI_INFO_OUTPUT,
 246                 [SNDRV_RAWMIDI_STREAM_INPUT] = SNDRV_RAWMIDI_INFO_INPUT,
 247         };
 248
 249         if (!(rmidi->info_flags & info_flags[stream]))
 250                 return -ENXIO;
 251         if (subdevice >= 0 && subdevice >= s->substream_count)
 252                 return -ENODEV;
 253
 254         list_for_each_entry(substream, &s->substreams, list) {
 255                 if (substream->opened) {
 256                         if (stream == SNDRV_RAWMIDI_STREAM_INPUT ||
 257                             !(mode & SNDRV_RAWMIDI_LFLG_APPEND) ||
 258                             !substream->append)
 259                                 continue;
 260                 }
 261                 if (subdevice < 0 || subdevice == substream->number) {
 262                         *sub_ret = substream;
 263                         return 0;
 264                 }
 265         }
 266         return -EAGAIN;
 267 }
 268
 269 /* open and do ref-counting for the given substream */
 270 static int open_substream(struct snd_rawmidi *rmidi,
 271                           struct snd_rawmidi_substream *substream,
 272                           int mode)
 273 {
 274         int err;
 275
 276         if (substream->use_count == 0) {
 277                 err = snd_rawmidi_runtime_create(substream);
 278                 if (err < 0)
 279                         return err;
 280                 err = substream->ops->open(substream);
 281                 if (err < 0) {
 282                         snd_rawmidi_runtime_free(substream);
 283                         return err;
 284                 }
 285                 substream->opened = 1;
 286                 substream->active_sensing = 0;
 287                 if (mode & SNDRV_RAWMIDI_LFLG_APPEND)
 288                         substream->append = 1;
 289                 substream->pid = get_pid(task_pid(current));
 290                 rmidi->streams[substream->stream].substream_opened++;
 291         }
 292         substream->use_count++;
 293         return 0;
 294 }
 295
 296 static void close_substream(struct snd_rawmidi *rmidi,
 297                             struct snd_rawmidi_substream *substream,
 298                             int cleanup);
 299
 300 static int rawmidi_open_priv(struct snd_rawmidi *rmidi, int subdevice, int mode,
 301                              struct snd_rawmidi_file *rfile)
 302 {
 303         struct snd_rawmidi_substream *sinput = NULL, *soutput = NULL;
 304         int err;
 305
 306         rfile->input = rfile->output = NULL;
 307         if (mode & SNDRV_RAWMIDI_LFLG_INPUT) {
 308                 err = assign_substream(rmidi, subdevice,
 309                                        SNDRV_RAWMIDI_STREAM_INPUT,
 310                                        mode, &sinput);
 311                 if (err < 0)
 312                         return err;
 313         }
 314         if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) {
 315                 err = assign_substream(rmidi, subdevice,
 316                                        SNDRV_RAWMIDI_STREAM_OUTPUT,
 317                                        mode, &soutput);
 318                 if (err < 0)
 319                         return err;
 320         }
 321
 322         if (sinput) {
 323                 err = open_substream(rmidi, sinput, mode);
 324                 if (err < 0)
 325                         return err;
 326         }
 327         if (soutput) {
 328                 err = open_substream(rmidi, soutput, mode);
 329                 if (err < 0) {
 330                         if (sinput)
 331                                 close_substream(rmidi, sinput, 0);
 332                         return err;
 333                 }
 334         }
 335
 336         rfile->rmidi = rmidi;
 337         rfile->input = sinput;
 338         rfile->output = soutput;
 339         return 0;
 340 }
 341
 342 /* called from sound/core/seq/seq_midi.c */
 343 int snd_rawmidi_kernel_open(struct snd_card *card, int device, int subdevice,
 344                             int mode, struct snd_rawmidi_file *rfile)
 345 {
 346         struct snd_rawmidi *rmidi;
 347         int err = 0;
 348
 349         if (snd_BUG_ON(!rfile))
 350                 return -EINVAL;
 351
 352         mutex_lock(&register_mutex);
 353         rmidi = snd_rawmidi_search(card, device);
 354         if (!rmidi)
 355                 err = -ENODEV;
 356         else if (!try_module_get(rmidi->card->module))
 357                 err = -ENXIO;
 358         mutex_unlock(&register_mutex);
 359         if (err < 0)
 360                 return err;
 361
 362         mutex_lock(&rmidi->open_mutex);
 363         err = rawmidi_open_priv(rmidi, subdevice, mode, rfile);
 364         mutex_unlock(&rmidi->open_mutex);
 365         if (err < 0)
 366                 module_put(rmidi->card->module);
 367         return err;
 368 }
 369 EXPORT_SYMBOL(snd_rawmidi_kernel_open);
 370
 371 static int snd_rawmidi_open(struct inode *inode, struct file *file)
 372 {
 373         int maj = imajor(inode);
 374         struct snd_card *card;
 375         int subdevice;
 376         unsigned short fflags;
 377         int err;
 378         struct snd_rawmidi *rmidi;
 379         struct snd_rawmidi_file *rawmidi_file = NULL;
 380         wait_queue_entry_t wait;
 381
 382         if ((file->f_flags & O_APPEND) && !(file->f_flags & O_NONBLOCK))
 383                 return -EINVAL;         /* invalid combination */
 384
 385         err = nonseekable_open(inode, file);
 386         if (err < 0)
 387                 return err;
 388
 389         if (maj == snd_major) {
 390                 rmidi = snd_lookup_minor_data(iminor(inode),
 391                                               SNDRV_DEVICE_TYPE_RAWMIDI);
 392 #ifdef CONFIG_SND_OSSEMUL
 393         } else if (maj == SOUND_MAJOR) {
 394                 rmidi = snd_lookup_oss_minor_data(iminor(inode),
 395                                                   SNDRV_OSS_DEVICE_TYPE_MIDI);
 396 #endif
 397         } else
 398                 return -ENXIO;
 399
 400         if (rmidi == NULL)
 401                 return -ENODEV;
 402
 403         if (!try_module_get(rmidi->card->module)) {
 404                 snd_card_unref(rmidi->card);
 405                 return -ENXIO;
 406         }
 407
 408         mutex_lock(&rmidi->open_mutex);
 409         card = rmidi->card;
 410         err = snd_card_file_add(card, file);
 411         if (err < 0)
 412                 goto __error_card;
 413         fflags = snd_rawmidi_file_flags(file);
 414         if ((file->f_flags & O_APPEND) || maj == SOUND_MAJOR) /* OSS emul? */
 415                 fflags |= SNDRV_RAWMIDI_LFLG_APPEND;
 416         rawmidi_file = kmalloc(sizeof(*rawmidi_file), GFP_KERNEL);
 417         if (rawmidi_file == NULL) {
 418                 err = -ENOMEM;
 419                 goto __error;
 420         }
 421         init_waitqueue_entry(&wait, current);
 422         add_wait_queue(&rmidi->open_wait, &wait);
 423         while (1) {
 424                 subdevice = snd_ctl_get_preferred_subdevice(card, SND_CTL_SUBDEV_RAWMIDI);
 425                 err = rawmidi_open_priv(rmidi, subdevice, fflags, rawmidi_file);
 426                 if (err >= 0)
 427                         break;
 428                 if (err == -EAGAIN) {
 429                         if (file->f_flags & O_NONBLOCK) {
 430                                 err = -EBUSY;
 431                                 break;
 432                         }
 433                 } else
 434                         break;
 435                 set_current_state(TASK_INTERRUPTIBLE);
 436                 mutex_unlock(&rmidi->open_mutex);
 437                 schedule();
 438                 mutex_lock(&rmidi->open_mutex);
 439                 if (rmidi->card->shutdown) {
 440                         err = -ENODEV;
 441                         break;
 442                 }
 443                 if (signal_pending(current)) {
 444                         err = -ERESTARTSYS;
 445                         break;
 446                 }
 447         }
 448         remove_wait_queue(&rmidi->open_wait, &wait);
 449         if (err < 0) {
 450                 kfree(rawmidi_file);
 451                 goto __error;
 452         }
 453 #ifdef CONFIG_SND_OSSEMUL
 454         if (rawmidi_file->input && rawmidi_file->input->runtime)
 455                 rawmidi_file->input->runtime->oss = (maj == SOUND_MAJOR);
 456         if (rawmidi_file->output && rawmidi_file->output->runtime)
 457                 rawmidi_file->output->runtime->oss = (maj == SOUND_MAJOR);
 458 #endif
 459         file->private_data = rawmidi_file;
 460         mutex_unlock(&rmidi->open_mutex);
 461         snd_card_unref(rmidi->card);
 462         return 0;
 463
 464  __error:
 465         snd_card_file_remove(card, file);
 466  __error_card:
 467         mutex_unlock(&rmidi->open_mutex);
 468         module_put(rmidi->card->module);
 469         snd_card_unref(rmidi->card);
 470         return err;
 471 }
 472
 473 static void close_substream(struct snd_rawmidi *rmidi,
 474                             struct snd_rawmidi_substream *substream,
 475                             int cleanup)
 476 {
 477         if (--substream->use_count)
 478                 return;
 479
 480         if (cleanup) {
 481                 if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
 482                         snd_rawmidi_input_trigger(substream, 0);
 483                 else {
 484                         if (substream->active_sensing) {
 485                                 unsigned char buf = 0xfe;
 486                                 /* sending single active sensing message
 487                                  * to shut the device up
 488                                  */
 489                                 snd_rawmidi_kernel_write(substream, &buf, 1);
 490                         }
 491                         if (snd_rawmidi_drain_output(substream) == -ERESTARTSYS)
 492                                 snd_rawmidi_output_trigger(substream, 0);
 493                 }
 494         }
 495         substream->ops->close(substream);
 496         if (substream->runtime->private_free)
 497                 substream->runtime->private_free(substream);
 498         snd_rawmidi_runtime_free(substream);
 499         substream->opened = 0;
 500         substream->append = 0;
 501         put_pid(substream->pid);
 502         substream->pid = NULL;
 503         rmidi->streams[substream->stream].substream_opened--;
 504 }
 505
 506 static void rawmidi_release_priv(struct snd_rawmidi_file *rfile)
 507 {
 508         struct snd_rawmidi *rmidi;
 509
 510         rmidi = rfile->rmidi;
 511         mutex_lock(&rmidi->open_mutex);
 512         if (rfile->input) {
 513                 close_substream(rmidi, rfile->input, 1);
 514                 rfile->input = NULL;
 515         }
 516         if (rfile->output) {
 517                 close_substream(rmidi, rfile->output, 1);
 518                 rfile->output = NULL;
 519         }
 520         rfile->rmidi = NULL;
 521         mutex_unlock(&rmidi->open_mutex);
 522         wake_up(&rmidi->open_wait);
 523 }
 524
 525 /* called from sound/core/seq/seq_midi.c */
 526 int snd_rawmidi_kernel_release(struct snd_rawmidi_file *rfile)
 527 {
 528         struct snd_rawmidi *rmidi;
 529
 530         if (snd_BUG_ON(!rfile))
 531                 return -ENXIO;
 532
 533         rmidi = rfile->rmidi;
 534         rawmidi_release_priv(rfile);
 535         module_put(rmidi->card->module);
 536         return 0;
 537 }
 538 EXPORT_SYMBOL(snd_rawmidi_kernel_release);
 539
 540 static int snd_rawmidi_release(struct inode *inode, struct file *file)
 541 {
 542         struct snd_rawmidi_file *rfile;
 543         struct snd_rawmidi *rmidi;
 544         struct module *module;
 545
 546         rfile = file->private_data;
 547         rmidi = rfile->rmidi;
 548         rawmidi_release_priv(rfile);
 549         kfree(rfile);
 550         module = rmidi->card->module;
 551         snd_card_file_remove(rmidi->card, file);
 552         module_put(module);
 553         return 0;
 554 }
 555
 556 static int snd_rawmidi_info(struct snd_rawmidi_substream *substream,
 557                             struct snd_rawmidi_info *info)
 558 {
 559         struct snd_rawmidi *rmidi;
 560
 561         if (substream == NULL)
 562                 return -ENODEV;
 563         rmidi = substream->rmidi;
 564         memset(info, 0, sizeof(*info));
 565         info->card = rmidi->card->number;
 566         info->device = rmidi->device;
 567         info->subdevice = substream->number;
 568         info->stream = substream->stream;
 569         info->flags = rmidi->info_flags;
 570         strcpy(info->id, rmidi->id);
 571         strcpy(info->name, rmidi->name);
 572         strcpy(info->subname, substream->name);
 573         info->subdevices_count = substream->pstr->substream_count;
 574         info->subdevices_avail = (substream->pstr->substream_count -
 575                                   substream->pstr->substream_opened);
 576         return 0;
 577 }
 578
 579 static int snd_rawmidi_info_user(struct snd_rawmidi_substream *substream,
 580                                  struct snd_rawmidi_info __user *_info)
 581 {
 582         struct snd_rawmidi_info info;
 583         int err;
 584
 585         err = snd_rawmidi_info(substream, &info);
 586         if (err < 0)
 587                 return err;
 588         if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
 589                 return -EFAULT;
 590         return 0;
 591 }
 592
 593 static int __snd_rawmidi_info_select(struct snd_card *card,
 594                                      struct snd_rawmidi_info *info)
 595 {
 596         struct snd_rawmidi *rmidi;
 597         struct snd_rawmidi_str *pstr;
 598         struct snd_rawmidi_substream *substream;
 599
 600         rmidi = snd_rawmidi_search(card, info->device);
 601         if (!rmidi)
 602                 return -ENXIO;
 603         if (info->stream < 0 || info->stream > 1)
 604                 return -EINVAL;
 605         info->stream = array_index_nospec(info->stream, 2);
 606         pstr = &rmidi->streams[info->stream];
 607         if (pstr->substream_count == 0)
 608                 return -ENOENT;
 609         if (info->subdevice >= pstr->substream_count)
 610                 return -ENXIO;
 611         list_for_each_entry(substream, &pstr->substreams, list) {
 612                 if ((unsigned int)substream->number == info->subdevice)
 613                         return snd_rawmidi_info(substream, info);
 614         }
 615         return -ENXIO;
 616 }
 617
 618 int snd_rawmidi_info_select(struct snd_card *card, struct snd_rawmidi_info *info)
 619 {
 620         int ret;
 621
 622         mutex_lock(&register_mutex);
 623         ret = __snd_rawmidi_info_select(card, info);
 624         mutex_unlock(&register_mutex);
 625         return ret;
 626 }
 627 EXPORT_SYMBOL(snd_rawmidi_info_select);
 628
 629 static int snd_rawmidi_info_select_user(struct snd_card *card,
 630                                         struct snd_rawmidi_info __user *_info)
 631 {
 632         int err;
 633         struct snd_rawmidi_info info;
 634
 635         if (get_user(info.device, &_info->device))
 636                 return -EFAULT;
 637         if (get_user(info.stream, &_info->stream))
 638                 return -EFAULT;
 639         if (get_user(info.subdevice, &_info->subdevice))
 640                 return -EFAULT;
 641         err = snd_rawmidi_info_select(card, &info);
 642         if (err < 0)
 643                 return err;
 644         if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
 645                 return -EFAULT;
 646         return 0;
 647 }
 648
 649 static int resize_runtime_buffer(struct snd_rawmidi_runtime *runtime,
 650                                  struct snd_rawmidi_params *params,
 651                                  bool is_input)
 652 {
 653         char *newbuf, *oldbuf;
 654
 655         if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L)
 656                 return -EINVAL;
 657         if (params->avail_min < 1 || params->avail_min > params->buffer_size)
 658                 return -EINVAL;
 659         if (params->buffer_size != runtime->buffer_size) {
 660                 newbuf = kvzalloc(params->buffer_size, GFP_KERNEL);
 661                 if (!newbuf)
 662                         return -ENOMEM;
 663                 spin_lock_irq(&runtime->lock);
 664                 oldbuf = runtime->buffer;
 665                 runtime->buffer = newbuf;
 666                 runtime->buffer_size = params->buffer_size;
 667                 __reset_runtime_ptrs(runtime, is_input);
 668                 spin_unlock_irq(&runtime->lock);
 669                 kvfree(oldbuf);
 670         }
 671         runtime->avail_min = params->avail_min;
 672         return 0;
 673 }
 674
 675 int snd_rawmidi_output_params(struct snd_rawmidi_substream *substream,
 676                               struct snd_rawmidi_params *params)
 677 {
 678         if (substream->append && substream->use_count > 1)
 679                 return -EBUSY;
 680         snd_rawmidi_drain_output(substream);
 681         substream->active_sensing = !params->no_active_sensing;
 682         return resize_runtime_buffer(substream->runtime, params, false);
 683 }
 684 EXPORT_SYMBOL(snd_rawmidi_output_params);
 685
 686 int snd_rawmidi_input_params(struct snd_rawmidi_substream *substream,
 687                              struct snd_rawmidi_params *params)
 688 {
 689         snd_rawmidi_drain_input(substream);
 690         return resize_runtime_buffer(substream->runtime, params, true);
 691 }
 692 EXPORT_SYMBOL(snd_rawmidi_input_params);
 693
 694 static int snd_rawmidi_output_status(struct snd_rawmidi_substream *substream,
 695                                      struct snd_rawmidi_status *status)
 696 {
 697         struct snd_rawmidi_runtime *runtime = substream->runtime;
 698
 699         memset(status, 0, sizeof(*status));
 700         status->stream = SNDRV_RAWMIDI_STREAM_OUTPUT;
 701         spin_lock_irq(&runtime->lock);
 702         status->avail = runtime->avail;
 703         spin_unlock_irq(&runtime->lock);
 704         return 0;
 705 }
 706
 707 static int snd_rawmidi_input_status(struct snd_rawmidi_substream *substream,
 708                                     struct snd_rawmidi_status *status)
 709 {
 710         struct snd_rawmidi_runtime *runtime = substream->runtime;
 711
 712         memset(status, 0, sizeof(*status));
 713         status->stream = SNDRV_RAWMIDI_STREAM_INPUT;
 714         spin_lock_irq(&runtime->lock);
 715         status->avail = runtime->avail;
 716         status->xruns = runtime->xruns;
 717         runtime->xruns = 0;
 718         spin_unlock_irq(&runtime->lock);
 719         return 0;
 720 }
 721
 722 static long snd_rawmidi_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 723 {
 724         struct snd_rawmidi_file *rfile;
 725         void __user *argp = (void __user *)arg;
 726
 727         rfile = file->private_data;
 728         if (((cmd >> 8) & 0xff) != 'W')
 729                 return -ENOTTY;
 730         switch (cmd) {
 731         case SNDRV_RAWMIDI_IOCTL_PVERSION:
 732                 return put_user(SNDRV_RAWMIDI_VERSION, (int __user *)argp) ? -EFAULT : 0;
 733         case SNDRV_RAWMIDI_IOCTL_INFO:
 734         {
 735                 int stream;
 736                 struct snd_rawmidi_info __user *info = argp;
 737
 738                 if (get_user(stream, &info->stream))
 739                         return -EFAULT;
 740                 switch (stream) {
 741                 case SNDRV_RAWMIDI_STREAM_INPUT:
 742                         return snd_rawmidi_info_user(rfile->input, info);
 743                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
 744                         return snd_rawmidi_info_user(rfile->output, info);
 745                 default:
 746                         return -EINVAL;
 747                 }
 748         }
 749         case SNDRV_RAWMIDI_IOCTL_PARAMS:
 750         {
 751                 struct snd_rawmidi_params params;
 752
 753                 if (copy_from_user(&params, argp, sizeof(struct snd_rawmidi_params)))
 754                         return -EFAULT;
 755                 switch (params.stream) {
 756                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
 757                         if (rfile->output == NULL)
 758                                 return -EINVAL;
 759                         return snd_rawmidi_output_params(rfile->output, &params);
 760                 case SNDRV_RAWMIDI_STREAM_INPUT:
 761                         if (rfile->input == NULL)
 762                                 return -EINVAL;
 763                         return snd_rawmidi_input_params(rfile->input, &params);
 764                 default:
 765                         return -EINVAL;
 766                 }
 767         }
 768         case SNDRV_RAWMIDI_IOCTL_STATUS:
 769         {
 770                 int err = 0;
 771                 struct snd_rawmidi_status status;
 772
 773                 if (copy_from_user(&status, argp, sizeof(struct snd_rawmidi_status)))
 774                         return -EFAULT;
 775                 switch (status.stream) {
 776                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
 777                         if (rfile->output == NULL)
 778                                 return -EINVAL;
 779                         err = snd_rawmidi_output_status(rfile->output, &status);
 780                         break;
 781                 case SNDRV_RAWMIDI_STREAM_INPUT:
 782                         if (rfile->input == NULL)
 783                                 return -EINVAL;
 784                         err = snd_rawmidi_input_status(rfile->input, &status);
 785                         break;
 786                 default:
 787                         return -EINVAL;
 788                 }
 789                 if (err < 0)
 790                         return err;
 791                 if (copy_to_user(argp, &status, sizeof(struct snd_rawmidi_status)))
 792                         return -EFAULT;
 793                 return 0;
 794         }
 795         case SNDRV_RAWMIDI_IOCTL_DROP:
 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_drop_output(rfile->output);
 806                 default:
 807                         return -EINVAL;
 808                 }
 809         }
 810         case SNDRV_RAWMIDI_IOCTL_DRAIN:
 811         {
 812                 int val;
 813
 814                 if (get_user(val, (int __user *) argp))
 815                         return -EFAULT;
 816                 switch (val) {
 817                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
 818                         if (rfile->output == NULL)
 819                                 return -EINVAL;
 820                         return snd_rawmidi_drain_output(rfile->output);
 821                 case SNDRV_RAWMIDI_STREAM_INPUT:
 822                         if (rfile->input == NULL)
 823                                 return -EINVAL;
 824                         return snd_rawmidi_drain_input(rfile->input);
 825                 default:
 826                         return -EINVAL;
 827                 }
 828         }
 829         default:
 830                 rmidi_dbg(rfile->rmidi,
 831                           "rawmidi: unknown command = 0x%x\n", cmd);
 832         }
 833         return -ENOTTY;
 834 }
 835
 836 static int snd_rawmidi_control_ioctl(struct snd_card *card,
 837                                      struct snd_ctl_file *control,
 838                                      unsigned int cmd,
 839                                      unsigned long arg)
 840 {
 841         void __user *argp = (void __user *)arg;
 842
 843         switch (cmd) {
 844         case SNDRV_CTL_IOCTL_RAWMIDI_NEXT_DEVICE:
 845         {
 846                 int device;
 847
 848                 if (get_user(device, (int __user *)argp))
 849                         return -EFAULT;
 850                 if (device >= SNDRV_RAWMIDI_DEVICES) /* next device is -1 */
 851                         device = SNDRV_RAWMIDI_DEVICES - 1;
 852                 mutex_lock(&register_mutex);
 853                 device = device < 0 ? 0 : device + 1;
 854                 while (device < SNDRV_RAWMIDI_DEVICES) {
 855                         if (snd_rawmidi_search(card, device))
 856                                 break;
 857                         device++;
 858                 }
 859                 if (device == SNDRV_RAWMIDI_DEVICES)
 860                         device = -1;
 861                 mutex_unlock(&register_mutex);
 862                 if (put_user(device, (int __user *)argp))
 863                         return -EFAULT;
 864                 return 0;
 865         }
 866         case SNDRV_CTL_IOCTL_RAWMIDI_PREFER_SUBDEVICE:
 867         {
 868                 int val;
 869
 870                 if (get_user(val, (int __user *)argp))
 871                         return -EFAULT;
 872                 control->preferred_subdevice[SND_CTL_SUBDEV_RAWMIDI] = val;
 873                 return 0;
 874         }
 875         case SNDRV_CTL_IOCTL_RAWMIDI_INFO:
 876                 return snd_rawmidi_info_select_user(card, argp);
 877         }
 878         return -ENOIOCTLCMD;
 879 }
 880
 881 /**
 882  * snd_rawmidi_receive - receive the input data from the device
 883  * @substream: the rawmidi substream
 884  * @buffer: the buffer pointer
 885  * @count: the data size to read
 886  *
 887  * Reads the data from the internal buffer.
 888  *
 889  * Return: The size of read data, or a negative error code on failure.
 890  */
 891 int snd_rawmidi_receive(struct snd_rawmidi_substream *substream,
 892                         const unsigned char *buffer, int count)
 893 {
 894         unsigned long flags;
 895         int result = 0, count1;
 896         struct snd_rawmidi_runtime *runtime = substream->runtime;
 897
 898         if (!substream->opened)
 899                 return -EBADFD;
 900         if (runtime->buffer == NULL) {
 901                 rmidi_dbg(substream->rmidi,
 902                           "snd_rawmidi_receive: input is not active!!!\n");
 903                 return -EINVAL;
 904         }
 905         spin_lock_irqsave(&runtime->lock, flags);
 906         if (count == 1) {       /* special case, faster code */
 907                 substream->bytes++;
 908                 if (runtime->avail < runtime->buffer_size) {
 909                         runtime->buffer[runtime->hw_ptr++] = buffer[0];
 910                         runtime->hw_ptr %= runtime->buffer_size;
 911                         runtime->avail++;
 912                         result++;
 913                 } else {
 914                         runtime->xruns++;
 915                 }
 916         } else {
 917                 substream->bytes += count;
 918                 count1 = runtime->buffer_size - runtime->hw_ptr;
 919                 if (count1 > count)
 920                         count1 = count;
 921                 if (count1 > (int)(runtime->buffer_size - runtime->avail))
 922                         count1 = runtime->buffer_size - runtime->avail;
 923                 memcpy(runtime->buffer + runtime->hw_ptr, buffer, count1);
 924                 runtime->hw_ptr += count1;
 925                 runtime->hw_ptr %= runtime->buffer_size;
 926                 runtime->avail += count1;
 927                 count -= count1;
 928                 result += count1;
 929                 if (count > 0) {
 930                         buffer += count1;
 931                         count1 = count;
 932                         if (count1 > (int)(runtime->buffer_size - runtime->avail)) {
 933                                 count1 = runtime->buffer_size - runtime->avail;
 934                                 runtime->xruns += count - count1;
 935                         }
 936                         if (count1 > 0) {
 937                                 memcpy(runtime->buffer, buffer, count1);
 938                                 runtime->hw_ptr = count1;
 939                                 runtime->avail += count1;
 940                                 result += count1;
 941                         }
 942                 }
 943         }
 944         if (result > 0) {
 945                 if (runtime->event)
 946                         schedule_work(&runtime->event_work);
 947                 else if (snd_rawmidi_ready(substream))
 948                         wake_up(&runtime->sleep);
 949         }
 950         spin_unlock_irqrestore(&runtime->lock, flags);
 951         return result;
 952 }
 953 EXPORT_SYMBOL(snd_rawmidi_receive);
 954
 955 static long snd_rawmidi_kernel_read1(struct snd_rawmidi_substream *substream,
 956                                      unsigned char __user *userbuf,
 957                                      unsigned char *kernelbuf, long count)
 958 {
 959         unsigned long flags;
 960         long result = 0, count1;
 961         struct snd_rawmidi_runtime *runtime = substream->runtime;
 962         unsigned long appl_ptr;
 963
 964         spin_lock_irqsave(&runtime->lock, flags);
 965         while (count > 0 && runtime->avail) {
 966                 count1 = runtime->buffer_size - runtime->appl_ptr;
 967                 if (count1 > count)
 968                         count1 = count;
 969                 if (count1 > (int)runtime->avail)
 970                         count1 = runtime->avail;
 971
 972                 /* update runtime->appl_ptr before unlocking for userbuf */
 973                 appl_ptr = runtime->appl_ptr;
 974                 runtime->appl_ptr += count1;
 975                 runtime->appl_ptr %= runtime->buffer_size;
 976                 runtime->avail -= count1;
 977
 978                 if (kernelbuf)
 979                         memcpy(kernelbuf + result, runtime->buffer + appl_ptr, count1);
 980                 if (userbuf) {
 981                         spin_unlock_irqrestore(&runtime->lock, flags);
 982                         if (copy_to_user(userbuf + result,
 983                                          runtime->buffer + appl_ptr, count1)) {
 984                                 return result > 0 ? result : -EFAULT;
 985                         }
 986                         spin_lock_irqsave(&runtime->lock, flags);
 987                 }
 988                 result += count1;
 989                 count -= count1;
 990         }
 991         spin_unlock_irqrestore(&runtime->lock, flags);
 992         return result;
 993 }
 994
 995 long snd_rawmidi_kernel_read(struct snd_rawmidi_substream *substream,
 996                              unsigned char *buf, long count)
 997 {
 998         snd_rawmidi_input_trigger(substream, 1);
 999         return snd_rawmidi_kernel_read1(substream, NULL/*userbuf*/, buf, count);
1000 }
1001 EXPORT_SYMBOL(snd_rawmidi_kernel_read);
1002
1003 static ssize_t snd_rawmidi_read(struct file *file, char __user *buf, size_t count,
1004                                 loff_t *offset)
1005 {
1006         long result;
1007         int count1;
1008         struct snd_rawmidi_file *rfile;
1009         struct snd_rawmidi_substream *substream;
1010         struct snd_rawmidi_runtime *runtime;
1011
1012         rfile = file->private_data;
1013         substream = rfile->input;
1014         if (substream == NULL)
1015                 return -EIO;
1016         runtime = substream->runtime;
1017         snd_rawmidi_input_trigger(substream, 1);
1018         result = 0;
1019         while (count > 0) {
1020                 spin_lock_irq(&runtime->lock);
1021                 while (!snd_rawmidi_ready(substream)) {
1022                         wait_queue_entry_t wait;
1023
1024                         if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1025                                 spin_unlock_irq(&runtime->lock);
1026                                 return result > 0 ? result : -EAGAIN;
1027                         }
1028                         init_waitqueue_entry(&wait, current);
1029                         add_wait_queue(&runtime->sleep, &wait);
1030                         set_current_state(TASK_INTERRUPTIBLE);
1031                         spin_unlock_irq(&runtime->lock);
1032                         schedule();
1033                         remove_wait_queue(&runtime->sleep, &wait);
1034                         if (rfile->rmidi->card->shutdown)
1035                                 return -ENODEV;
1036                         if (signal_pending(current))
1037                                 return result > 0 ? result : -ERESTARTSYS;
1038                         if (!runtime->avail)
1039                                 return result > 0 ? result : -EIO;
1040                         spin_lock_irq(&runtime->lock);
1041                 }
1042                 spin_unlock_irq(&runtime->lock);
1043                 count1 = snd_rawmidi_kernel_read1(substream,
1044                                                   (unsigned char __user *)buf,
1045                                                   NULL/*kernelbuf*/,
1046                                                   count);
1047                 if (count1 < 0)
1048                         return result > 0 ? result : count1;
1049                 result += count1;
1050                 buf += count1;
1051                 count -= count1;
1052         }
1053         return result;
1054 }
1055
1056 /**
1057  * snd_rawmidi_transmit_empty - check whether the output buffer is empty
1058  * @substream: the rawmidi substream
1059  *
1060  * Return: 1 if the internal output buffer is empty, 0 if not.
1061  */
1062 int snd_rawmidi_transmit_empty(struct snd_rawmidi_substream *substream)
1063 {
1064         struct snd_rawmidi_runtime *runtime = substream->runtime;
1065         int result;
1066         unsigned long flags;
1067
1068         if (runtime->buffer == NULL) {
1069                 rmidi_dbg(substream->rmidi,
1070                           "snd_rawmidi_transmit_empty: output is not active!!!\n");
1071                 return 1;
1072         }
1073         spin_lock_irqsave(&runtime->lock, flags);
1074         result = runtime->avail >= runtime->buffer_size;
1075         spin_unlock_irqrestore(&runtime->lock, flags);
1076         return result;
1077 }
1078 EXPORT_SYMBOL(snd_rawmidi_transmit_empty);
1079
1080 /**
1081  * __snd_rawmidi_transmit_peek - copy data from the internal buffer
1082  * @substream: the rawmidi substream
1083  * @buffer: the buffer pointer
1084  * @count: data size to transfer
1085  *
1086  * This is a variant of snd_rawmidi_transmit_peek() without spinlock.
1087  */
1088 int __snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
1089                               unsigned char *buffer, int count)
1090 {
1091         int result, count1;
1092         struct snd_rawmidi_runtime *runtime = substream->runtime;
1093
1094         if (runtime->buffer == NULL) {
1095                 rmidi_dbg(substream->rmidi,
1096                           "snd_rawmidi_transmit_peek: output is not active!!!\n");
1097                 return -EINVAL;
1098         }
1099         result = 0;
1100         if (runtime->avail >= runtime->buffer_size) {
1101                 /* warning: lowlevel layer MUST trigger down the hardware */
1102                 goto __skip;
1103         }
1104         if (count == 1) {       /* special case, faster code */
1105                 *buffer = runtime->buffer[runtime->hw_ptr];
1106                 result++;
1107         } else {
1108                 count1 = runtime->buffer_size - runtime->hw_ptr;
1109                 if (count1 > count)
1110                         count1 = count;
1111                 if (count1 > (int)(runtime->buffer_size - runtime->avail))
1112                         count1 = runtime->buffer_size - runtime->avail;
1113                 memcpy(buffer, runtime->buffer + runtime->hw_ptr, count1);
1114                 count -= count1;
1115                 result += count1;
1116                 if (count > 0) {
1117                         if (count > (int)(runtime->buffer_size - runtime->avail - count1))
1118                                 count = runtime->buffer_size - runtime->avail - count1;
1119                         memcpy(buffer + count1, runtime->buffer, count);
1120                         result += count;
1121                 }
1122         }
1123       __skip:
1124         return result;
1125 }
1126 EXPORT_SYMBOL(__snd_rawmidi_transmit_peek);
1127
1128 /**
1129  * snd_rawmidi_transmit_peek - copy data from the internal buffer
1130  * @substream: the rawmidi substream
1131  * @buffer: the buffer pointer
1132  * @count: data size to transfer
1133  *
1134  * Copies data from the internal output buffer to the given buffer.
1135  *
1136  * Call this in the interrupt handler when the midi output is ready,
1137  * and call snd_rawmidi_transmit_ack() after the transmission is
1138  * finished.
1139  *
1140  * Return: The size of copied data, or a negative error code on failure.
1141  */
1142 int snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
1143                               unsigned char *buffer, int count)
1144 {
1145         struct snd_rawmidi_runtime *runtime = substream->runtime;
1146         int result;
1147         unsigned long flags;
1148
1149         spin_lock_irqsave(&runtime->lock, flags);
1150         result = __snd_rawmidi_transmit_peek(substream, buffer, count);
1151         spin_unlock_irqrestore(&runtime->lock, flags);
1152         return result;
1153 }
1154 EXPORT_SYMBOL(snd_rawmidi_transmit_peek);
1155
1156 /**
1157  * __snd_rawmidi_transmit_ack - acknowledge the transmission
1158  * @substream: the rawmidi substream
1159  * @count: the transferred count
1160  *
1161  * This is a variant of __snd_rawmidi_transmit_ack() without spinlock.
1162  */
1163 int __snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count)
1164 {
1165         struct snd_rawmidi_runtime *runtime = substream->runtime;
1166
1167         if (runtime->buffer == NULL) {
1168                 rmidi_dbg(substream->rmidi,
1169                           "snd_rawmidi_transmit_ack: output is not active!!!\n");
1170                 return -EINVAL;
1171         }
1172         snd_BUG_ON(runtime->avail + count > runtime->buffer_size);
1173         runtime->hw_ptr += count;
1174         runtime->hw_ptr %= runtime->buffer_size;
1175         runtime->avail += count;
1176         substream->bytes += count;
1177         if (count > 0) {
1178                 if (runtime->drain || snd_rawmidi_ready(substream))
1179                         wake_up(&runtime->sleep);
1180         }
1181         return count;
1182 }
1183 EXPORT_SYMBOL(__snd_rawmidi_transmit_ack);
1184
1185 /**
1186  * snd_rawmidi_transmit_ack - acknowledge the transmission
1187  * @substream: the rawmidi substream
1188  * @count: the transferred count
1189  *
1190  * Advances the hardware pointer for the internal output buffer with
1191  * the given size and updates the condition.
1192  * Call after the transmission is finished.
1193  *
1194  * Return: The advanced size if successful, or a negative error code on failure.
1195  */
1196 int snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count)
1197 {
1198         struct snd_rawmidi_runtime *runtime = substream->runtime;
1199         int result;
1200         unsigned long flags;
1201
1202         spin_lock_irqsave(&runtime->lock, flags);
1203         result = __snd_rawmidi_transmit_ack(substream, count);
1204         spin_unlock_irqrestore(&runtime->lock, flags);
1205         return result;
1206 }
1207 EXPORT_SYMBOL(snd_rawmidi_transmit_ack);
1208
1209 /**
1210  * snd_rawmidi_transmit - copy from the buffer to the device
1211  * @substream: the rawmidi substream
1212  * @buffer: the buffer pointer
1213  * @count: the data size to transfer
1214  *
1215  * Copies data from the buffer to the device and advances the pointer.
1216  *
1217  * Return: The copied size if successful, or a negative error code on failure.
1218  */
1219 int snd_rawmidi_transmit(struct snd_rawmidi_substream *substream,
1220                          unsigned char *buffer, int count)
1221 {
1222         struct snd_rawmidi_runtime *runtime = substream->runtime;
1223         int result;
1224         unsigned long flags;
1225
1226         spin_lock_irqsave(&runtime->lock, flags);
1227         if (!substream->opened)
1228                 result = -EBADFD;
1229         else {
1230                 count = __snd_rawmidi_transmit_peek(substream, buffer, count);
1231                 if (count <= 0)
1232                         result = count;
1233                 else
1234                         result = __snd_rawmidi_transmit_ack(substream, count);
1235         }
1236         spin_unlock_irqrestore(&runtime->lock, flags);
1237         return result;
1238 }
1239 EXPORT_SYMBOL(snd_rawmidi_transmit);
1240
1241 /**
1242  * snd_rawmidi_proceed - Discard the all pending bytes and proceed
1243  * @substream: rawmidi substream
1244  *
1245  * Return: the number of discarded bytes
1246  */
1247 int snd_rawmidi_proceed(struct snd_rawmidi_substream *substream)
1248 {
1249         struct snd_rawmidi_runtime *runtime = substream->runtime;
1250         unsigned long flags;
1251         int count = 0;
1252
1253         spin_lock_irqsave(&runtime->lock, flags);
1254         if (runtime->avail < runtime->buffer_size) {
1255                 count = runtime->buffer_size - runtime->avail;
1256                 __snd_rawmidi_transmit_ack(substream, count);
1257         }
1258         spin_unlock_irqrestore(&runtime->lock, flags);
1259         return count;
1260 }
1261 EXPORT_SYMBOL(snd_rawmidi_proceed);
1262
1263 static long snd_rawmidi_kernel_write1(struct snd_rawmidi_substream *substream,
1264                                       const unsigned char __user *userbuf,
1265                                       const unsigned char *kernelbuf,
1266                                       long count)
1267 {
1268         unsigned long flags;
1269         long count1, result;
1270         struct snd_rawmidi_runtime *runtime = substream->runtime;
1271         unsigned long appl_ptr;
1272
1273         if (!kernelbuf && !userbuf)
1274                 return -EINVAL;
1275         if (snd_BUG_ON(!runtime->buffer))
1276                 return -EINVAL;
1277
1278         result = 0;
1279         spin_lock_irqsave(&runtime->lock, flags);
1280         if (substream->append) {
1281                 if ((long)runtime->avail < count) {
1282                         spin_unlock_irqrestore(&runtime->lock, flags);
1283                         return -EAGAIN;
1284                 }
1285         }
1286         while (count > 0 && runtime->avail > 0) {
1287                 count1 = runtime->buffer_size - runtime->appl_ptr;
1288                 if (count1 > count)
1289                         count1 = count;
1290                 if (count1 > (long)runtime->avail)
1291                         count1 = runtime->avail;
1292
1293                 /* update runtime->appl_ptr before unlocking for userbuf */
1294                 appl_ptr = runtime->appl_ptr;
1295                 runtime->appl_ptr += count1;
1296                 runtime->appl_ptr %= runtime->buffer_size;
1297                 runtime->avail -= count1;
1298
1299                 if (kernelbuf)
1300                         memcpy(runtime->buffer + appl_ptr,
1301                                kernelbuf + result, count1);
1302                 else if (userbuf) {
1303                         spin_unlock_irqrestore(&runtime->lock, flags);
1304                         if (copy_from_user(runtime->buffer + appl_ptr,
1305                                            userbuf + result, count1)) {
1306                                 spin_lock_irqsave(&runtime->lock, flags);
1307                                 result = result > 0 ? result : -EFAULT;
1308                                 goto __end;
1309                         }
1310                         spin_lock_irqsave(&runtime->lock, flags);
1311                 }
1312                 result += count1;
1313                 count -= count1;
1314         }
1315       __end:
1316         count1 = runtime->avail < runtime->buffer_size;
1317         spin_unlock_irqrestore(&runtime->lock, flags);
1318         if (count1)
1319                 snd_rawmidi_output_trigger(substream, 1);
1320         return result;
1321 }
1322
1323 long snd_rawmidi_kernel_write(struct snd_rawmidi_substream *substream,
1324                               const unsigned char *buf, long count)
1325 {
1326         return snd_rawmidi_kernel_write1(substream, NULL, buf, count);
1327 }
1328 EXPORT_SYMBOL(snd_rawmidi_kernel_write);
1329
1330 static ssize_t snd_rawmidi_write(struct file *file, const char __user *buf,
1331                                  size_t count, loff_t *offset)
1332 {
1333         long result, timeout;
1334         int count1;
1335         struct snd_rawmidi_file *rfile;
1336         struct snd_rawmidi_runtime *runtime;
1337         struct snd_rawmidi_substream *substream;
1338
1339         rfile = file->private_data;
1340         substream = rfile->output;
1341         runtime = substream->runtime;
1342         /* we cannot put an atomic message to our buffer */
1343         if (substream->append && count > runtime->buffer_size)
1344                 return -EIO;
1345         result = 0;
1346         while (count > 0) {
1347                 spin_lock_irq(&runtime->lock);
1348                 while (!snd_rawmidi_ready_append(substream, count)) {
1349                         wait_queue_entry_t wait;
1350
1351                         if (file->f_flags & O_NONBLOCK) {
1352                                 spin_unlock_irq(&runtime->lock);
1353                                 return result > 0 ? result : -EAGAIN;
1354                         }
1355                         init_waitqueue_entry(&wait, current);
1356                         add_wait_queue(&runtime->sleep, &wait);
1357                         set_current_state(TASK_INTERRUPTIBLE);
1358                         spin_unlock_irq(&runtime->lock);
1359                         timeout = schedule_timeout(30 * HZ);
1360                         remove_wait_queue(&runtime->sleep, &wait);
1361                         if (rfile->rmidi->card->shutdown)
1362                                 return -ENODEV;
1363                         if (signal_pending(current))
1364                                 return result > 0 ? result : -ERESTARTSYS;
1365                         if (!runtime->avail && !timeout)
1366                                 return result > 0 ? result : -EIO;
1367                         spin_lock_irq(&runtime->lock);
1368                 }
1369                 spin_unlock_irq(&runtime->lock);
1370                 count1 = snd_rawmidi_kernel_write1(substream, buf, NULL, count);
1371                 if (count1 < 0)
1372                         return result > 0 ? result : count1;
1373                 result += count1;
1374                 buf += count1;
1375                 if ((size_t)count1 < count && (file->f_flags & O_NONBLOCK))
1376                         break;
1377                 count -= count1;
1378         }
1379         if (file->f_flags & O_DSYNC) {
1380                 spin_lock_irq(&runtime->lock);
1381                 while (runtime->avail != runtime->buffer_size) {
1382                         wait_queue_entry_t wait;
1383                         unsigned int last_avail = runtime->avail;
1384
1385                         init_waitqueue_entry(&wait, current);
1386                         add_wait_queue(&runtime->sleep, &wait);
1387                         set_current_state(TASK_INTERRUPTIBLE);
1388                         spin_unlock_irq(&runtime->lock);
1389                         timeout = schedule_timeout(30 * HZ);
1390                         remove_wait_queue(&runtime->sleep, &wait);
1391                         if (signal_pending(current))
1392                                 return result > 0 ? result : -ERESTARTSYS;
1393                         if (runtime->avail == last_avail && !timeout)
1394                                 return result > 0 ? result : -EIO;
1395                         spin_lock_irq(&runtime->lock);
1396                 }
1397                 spin_unlock_irq(&runtime->lock);
1398         }
1399         return result;
1400 }
1401
1402 static __poll_t snd_rawmidi_poll(struct file *file, poll_table *wait)
1403 {
1404         struct snd_rawmidi_file *rfile;
1405         struct snd_rawmidi_runtime *runtime;
1406         __poll_t mask;
1407
1408         rfile = file->private_data;
1409         if (rfile->input != NULL) {
1410                 runtime = rfile->input->runtime;
1411                 snd_rawmidi_input_trigger(rfile->input, 1);
1412                 poll_wait(file, &runtime->sleep, wait);
1413         }
1414         if (rfile->output != NULL) {
1415                 runtime = rfile->output->runtime;
1416                 poll_wait(file, &runtime->sleep, wait);
1417         }
1418         mask = 0;
1419         if (rfile->input != NULL) {
1420                 if (snd_rawmidi_ready(rfile->input))
1421                         mask |= EPOLLIN | EPOLLRDNORM;
1422         }
1423         if (rfile->output != NULL) {
1424                 if (snd_rawmidi_ready(rfile->output))
1425                         mask |= EPOLLOUT | EPOLLWRNORM;
1426         }
1427         return mask;
1428 }
1429
1430 /*
1431  */
1432 #ifdef CONFIG_COMPAT
1433 #include "rawmidi_compat.c"
1434 #else
1435 #define snd_rawmidi_ioctl_compat        NULL
1436 #endif
1437
1438 /*
1439  */
1440
1441 static void snd_rawmidi_proc_info_read(struct snd_info_entry *entry,
1442                                        struct snd_info_buffer *buffer)
1443 {
1444         struct snd_rawmidi *rmidi;
1445         struct snd_rawmidi_substream *substream;
1446         struct snd_rawmidi_runtime *runtime;
1447
1448         rmidi = entry->private_data;
1449         snd_iprintf(buffer, "%s\n\n", rmidi->name);
1450         mutex_lock(&rmidi->open_mutex);
1451         if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_OUTPUT) {
1452                 list_for_each_entry(substream,
1453                                     &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams,
1454                                     list) {
1455                         snd_iprintf(buffer,
1456                                     "Output %d\n"
1457                                     "  Tx bytes     : %lu\n",
1458                                     substream->number,
1459                                     (unsigned long) substream->bytes);
1460                         if (substream->opened) {
1461                                 snd_iprintf(buffer,
1462                                     "  Owner PID    : %d\n",
1463                                     pid_vnr(substream->pid));
1464                                 runtime = substream->runtime;
1465                                 snd_iprintf(buffer,
1466                                     "  Mode         : %s\n"
1467                                     "  Buffer size  : %lu\n"
1468                                     "  Avail        : %lu\n",
1469                                     runtime->oss ? "OSS compatible" : "native",
1470                                     (unsigned long) runtime->buffer_size,
1471                                     (unsigned long) runtime->avail);
1472                         }
1473                 }
1474         }
1475         if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_INPUT) {
1476                 list_for_each_entry(substream,
1477                                     &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams,
1478                                     list) {
1479                         snd_iprintf(buffer,
1480                                     "Input %d\n"
1481                                     "  Rx bytes     : %lu\n",
1482                                     substream->number,
1483                                     (unsigned long) substream->bytes);
1484                         if (substream->opened) {
1485                                 snd_iprintf(buffer,
1486                                             "  Owner PID    : %d\n",
1487                                             pid_vnr(substream->pid));
1488                                 runtime = substream->runtime;
1489                                 snd_iprintf(buffer,
1490                                             "  Buffer size  : %lu\n"
1491                                             "  Avail        : %lu\n"
1492                                             "  Overruns     : %lu\n",
1493                                             (unsigned long) runtime->buffer_size,
1494                                             (unsigned long) runtime->avail,
1495                                             (unsigned long) runtime->xruns);
1496                         }
1497                 }
1498         }
1499         mutex_unlock(&rmidi->open_mutex);
1500 }
1501
1502 /*
1503  *  Register functions
1504  */
1505
1506 static const struct file_operations snd_rawmidi_f_ops = {
1507         .owner =        THIS_MODULE,
1508         .read =         snd_rawmidi_read,
1509         .write =        snd_rawmidi_write,
1510         .open =         snd_rawmidi_open,
1511         .release =      snd_rawmidi_release,
1512         .llseek =       no_llseek,
1513         .poll =         snd_rawmidi_poll,
1514         .unlocked_ioctl =       snd_rawmidi_ioctl,
1515         .compat_ioctl = snd_rawmidi_ioctl_compat,
1516 };
1517
1518 static int snd_rawmidi_alloc_substreams(struct snd_rawmidi *rmidi,
1519                                         struct snd_rawmidi_str *stream,
1520                                         int direction,
1521                                         int count)
1522 {
1523         struct snd_rawmidi_substream *substream;
1524         int idx;
1525
1526         for (idx = 0; idx < count; idx++) {
1527                 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
1528                 if (!substream)
1529                         return -ENOMEM;
1530                 substream->stream = direction;
1531                 substream->number = idx;
1532                 substream->rmidi = rmidi;
1533                 substream->pstr = stream;
1534                 list_add_tail(&substream->list, &stream->substreams);
1535                 stream->substream_count++;
1536         }
1537         return 0;
1538 }
1539
1540 static void release_rawmidi_device(struct device *dev)
1541 {
1542         kfree(container_of(dev, struct snd_rawmidi, dev));
1543 }
1544
1545 /**
1546  * snd_rawmidi_new - create a rawmidi instance
1547  * @card: the card instance
1548  * @id: the id string
1549  * @device: the device index
1550  * @output_count: the number of output streams
1551  * @input_count: the number of input streams
1552  * @rrawmidi: the pointer to store the new rawmidi instance
1553  *
1554  * Creates a new rawmidi instance.
1555  * Use snd_rawmidi_set_ops() to set the operators to the new instance.
1556  *
1557  * Return: Zero if successful, or a negative error code on failure.
1558  */
1559 int snd_rawmidi_new(struct snd_card *card, char *id, int device,
1560                     int output_count, int input_count,
1561                     struct snd_rawmidi **rrawmidi)
1562 {
1563         struct snd_rawmidi *rmidi;
1564         int err;
1565         static struct snd_device_ops ops = {
1566                 .dev_free = snd_rawmidi_dev_free,
1567                 .dev_register = snd_rawmidi_dev_register,
1568                 .dev_disconnect = snd_rawmidi_dev_disconnect,
1569         };
1570
1571         if (snd_BUG_ON(!card))
1572                 return -ENXIO;
1573         if (rrawmidi)
1574                 *rrawmidi = NULL;
1575         rmidi = kzalloc(sizeof(*rmidi), GFP_KERNEL);
1576         if (!rmidi)
1577                 return -ENOMEM;
1578         rmidi->card = card;
1579         rmidi->device = device;
1580         mutex_init(&rmidi->open_mutex);
1581         init_waitqueue_head(&rmidi->open_wait);
1582         INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams);
1583         INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams);
1584
1585         if (id != NULL)
1586                 strlcpy(rmidi->id, id, sizeof(rmidi->id));
1587
1588         snd_device_initialize(&rmidi->dev, card);
1589         rmidi->dev.release = release_rawmidi_device;
1590         dev_set_name(&rmidi->dev, "midiC%iD%i", card->number, device);
1591
1592         err = snd_rawmidi_alloc_substreams(rmidi,
1593                                            &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT],
1594                                            SNDRV_RAWMIDI_STREAM_INPUT,
1595                                            input_count);
1596         if (err < 0)
1597                 goto error;
1598         err = snd_rawmidi_alloc_substreams(rmidi,
1599                                            &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT],
1600                                            SNDRV_RAWMIDI_STREAM_OUTPUT,
1601                                            output_count);
1602         if (err < 0)
1603                 goto error;
1604         err = snd_device_new(card, SNDRV_DEV_RAWMIDI, rmidi, &ops);
1605         if (err < 0)
1606                 goto error;
1607
1608         if (rrawmidi)
1609                 *rrawmidi = rmidi;
1610         return 0;
1611
1612  error:
1613         snd_rawmidi_free(rmidi);
1614         return err;
1615 }
1616 EXPORT_SYMBOL(snd_rawmidi_new);
1617
1618 static void snd_rawmidi_free_substreams(struct snd_rawmidi_str *stream)
1619 {
1620         struct snd_rawmidi_substream *substream;
1621
1622         while (!list_empty(&stream->substreams)) {
1623                 substream = list_entry(stream->substreams.next, struct snd_rawmidi_substream, list);
1624                 list_del(&substream->list);
1625                 kfree(substream);
1626         }
1627 }
1628
1629 static int snd_rawmidi_free(struct snd_rawmidi *rmidi)
1630 {
1631         if (!rmidi)
1632                 return 0;
1633
1634         snd_info_free_entry(rmidi->proc_entry);
1635         rmidi->proc_entry = NULL;
1636         mutex_lock(&register_mutex);
1637         if (rmidi->ops && rmidi->ops->dev_unregister)
1638                 rmidi->ops->dev_unregister(rmidi);
1639         mutex_unlock(&register_mutex);
1640
1641         snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT]);
1642         snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT]);
1643         if (rmidi->private_free)
1644                 rmidi->private_free(rmidi);
1645         put_device(&rmidi->dev);
1646         return 0;
1647 }
1648
1649 static int snd_rawmidi_dev_free(struct snd_device *device)
1650 {
1651         struct snd_rawmidi *rmidi = device->device_data;
1652
1653         return snd_rawmidi_free(rmidi);
1654 }
1655
1656 #if IS_ENABLED(CONFIG_SND_SEQUENCER)
1657 static void snd_rawmidi_dev_seq_free(struct snd_seq_device *device)
1658 {
1659         struct snd_rawmidi *rmidi = device->private_data;
1660
1661         rmidi->seq_dev = NULL;
1662 }
1663 #endif
1664
1665 static int snd_rawmidi_dev_register(struct snd_device *device)
1666 {
1667         int err;
1668         struct snd_info_entry *entry;
1669         char name[16];
1670         struct snd_rawmidi *rmidi = device->device_data;
1671
1672         if (rmidi->device >= SNDRV_RAWMIDI_DEVICES)
1673                 return -ENOMEM;
1674         err = 0;
1675         mutex_lock(&register_mutex);
1676         if (snd_rawmidi_search(rmidi->card, rmidi->device))
1677                 err = -EBUSY;
1678         else
1679                 list_add_tail(&rmidi->list, &snd_rawmidi_devices);
1680         mutex_unlock(&register_mutex);
1681         if (err < 0)
1682                 return err;
1683
1684         err = snd_register_device(SNDRV_DEVICE_TYPE_RAWMIDI,
1685                                   rmidi->card, rmidi->device,
1686                                   &snd_rawmidi_f_ops, rmidi, &rmidi->dev);
1687         if (err < 0) {
1688                 rmidi_err(rmidi, "unable to register\n");
1689                 goto error;
1690         }
1691         if (rmidi->ops && rmidi->ops->dev_register) {
1692                 err = rmidi->ops->dev_register(rmidi);
1693                 if (err < 0)
1694                         goto error_unregister;
1695         }
1696 #ifdef CONFIG_SND_OSSEMUL
1697         rmidi->ossreg = 0;
1698         if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1699                 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1700                                             rmidi->card, 0, &snd_rawmidi_f_ops,
1701                                             rmidi) < 0) {
1702                         rmidi_err(rmidi,
1703                                   "unable to register OSS rawmidi device %i:%i\n",
1704                                   rmidi->card->number, 0);
1705                 } else {
1706                         rmidi->ossreg++;
1707 #ifdef SNDRV_OSS_INFO_DEV_MIDI
1708                         snd_oss_info_register(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number, rmidi->name);
1709 #endif
1710                 }
1711         }
1712         if ((int)rmidi->device == amidi_map[rmidi->card->number]) {
1713                 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1714                                             rmidi->card, 1, &snd_rawmidi_f_ops,
1715                                             rmidi) < 0) {
1716                         rmidi_err(rmidi,
1717                                   "unable to register OSS rawmidi device %i:%i\n",
1718                                   rmidi->card->number, 1);
1719                 } else {
1720                         rmidi->ossreg++;
1721                 }
1722         }
1723 #endif /* CONFIG_SND_OSSEMUL */
1724         sprintf(name, "midi%d", rmidi->device);
1725         entry = snd_info_create_card_entry(rmidi->card, name, rmidi->card->proc_root);
1726         if (entry) {
1727                 entry->private_data = rmidi;
1728                 entry->c.text.read = snd_rawmidi_proc_info_read;
1729                 if (snd_info_register(entry) < 0) {
1730                         snd_info_free_entry(entry);
1731                         entry = NULL;
1732                 }
1733         }
1734         rmidi->proc_entry = entry;
1735 #if IS_ENABLED(CONFIG_SND_SEQUENCER)
1736         if (!rmidi->ops || !rmidi->ops->dev_register) { /* own registration mechanism */
1737                 if (snd_seq_device_new(rmidi->card, rmidi->device, SNDRV_SEQ_DEV_ID_MIDISYNTH, 0, &rmidi->seq_dev) >= 0) {
1738                         rmidi->seq_dev->private_data = rmidi;
1739                         rmidi->seq_dev->private_free = snd_rawmidi_dev_seq_free;
1740                         sprintf(rmidi->seq_dev->name, "MIDI %d-%d", rmidi->card->number, rmidi->device);
1741                         snd_device_register(rmidi->card, rmidi->seq_dev);
1742                 }
1743         }
1744 #endif
1745         return 0;
1746
1747  error_unregister:
1748         snd_unregister_device(&rmidi->dev);
1749  error:
1750         mutex_lock(&register_mutex);
1751         list_del(&rmidi->list);
1752         mutex_unlock(&register_mutex);
1753         return err;
1754 }
1755
1756 static int snd_rawmidi_dev_disconnect(struct snd_device *device)
1757 {
1758         struct snd_rawmidi *rmidi = device->device_data;
1759         int dir;
1760
1761         mutex_lock(&register_mutex);
1762         mutex_lock(&rmidi->open_mutex);
1763         wake_up(&rmidi->open_wait);
1764         list_del_init(&rmidi->list);
1765         for (dir = 0; dir < 2; dir++) {
1766                 struct snd_rawmidi_substream *s;
1767
1768                 list_for_each_entry(s, &rmidi->streams[dir].substreams, list) {
1769                         if (s->runtime)
1770                                 wake_up(&s->runtime->sleep);
1771                 }
1772         }
1773
1774 #ifdef CONFIG_SND_OSSEMUL
1775         if (rmidi->ossreg) {
1776                 if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1777                         snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 0);
1778 #ifdef SNDRV_OSS_INFO_DEV_MIDI
1779                         snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number);
1780 #endif
1781                 }
1782                 if ((int)rmidi->device == amidi_map[rmidi->card->number])
1783                         snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 1);
1784                 rmidi->ossreg = 0;
1785         }
1786 #endif /* CONFIG_SND_OSSEMUL */
1787         snd_unregister_device(&rmidi->dev);
1788         mutex_unlock(&rmidi->open_mutex);
1789         mutex_unlock(&register_mutex);
1790         return 0;
1791 }
1792
1793 /**
1794  * snd_rawmidi_set_ops - set the rawmidi operators
1795  * @rmidi: the rawmidi instance
1796  * @stream: the stream direction, SNDRV_RAWMIDI_STREAM_XXX
1797  * @ops: the operator table
1798  *
1799  * Sets the rawmidi operators for the given stream direction.
1800  */
1801 void snd_rawmidi_set_ops(struct snd_rawmidi *rmidi, int stream,
1802                          const struct snd_rawmidi_ops *ops)
1803 {
1804         struct snd_rawmidi_substream *substream;
1805
1806         list_for_each_entry(substream, &rmidi->streams[stream].substreams, list)
1807                 substream->ops = ops;
1808 }
1809 EXPORT_SYMBOL(snd_rawmidi_set_ops);
1810
1811 /*
1812  *  ENTRY functions
1813  */
1814
1815 static int __init alsa_rawmidi_init(void)
1816 {
1817
1818         snd_ctl_register_ioctl(snd_rawmidi_control_ioctl);
1819         snd_ctl_register_ioctl_compat(snd_rawmidi_control_ioctl);
1820 #ifdef CONFIG_SND_OSSEMUL
1821         { int i;
1822         /* check device map table */
1823         for (i = 0; i < SNDRV_CARDS; i++) {
1824                 if (midi_map[i] < 0 || midi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1825                         pr_err("ALSA: rawmidi: invalid midi_map[%d] = %d\n",
1826                                i, midi_map[i]);
1827                         midi_map[i] = 0;
1828                 }
1829                 if (amidi_map[i] < 0 || amidi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1830                         pr_err("ALSA: rawmidi: invalid amidi_map[%d] = %d\n",
1831                                i, amidi_map[i]);
1832                         amidi_map[i] = 1;
1833                 }
1834         }
1835         }
1836 #endif /* CONFIG_SND_OSSEMUL */
1837         return 0;
1838 }
1839
1840 static void __exit alsa_rawmidi_exit(void)
1841 {
1842         snd_ctl_unregister_ioctl(snd_rawmidi_control_ioctl);
1843         snd_ctl_unregister_ioctl_compat(snd_rawmidi_control_ioctl);
1844 }
1845
1846 module_init(alsa_rawmidi_init)
1847 module_exit(alsa_rawmidi_exit)