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 /* buffer refcount management: call with runtime->lock held */
 101 static inline void snd_rawmidi_buffer_ref(struct snd_rawmidi_runtime *runtime)
 102 {
 103         runtime->buffer_ref++;
 104 }
 105
 106 static inline void snd_rawmidi_buffer_unref(struct snd_rawmidi_runtime *runtime)
 107 {
 108         runtime->buffer_ref--;
 109 }
 110
 111 static int snd_rawmidi_runtime_create(struct snd_rawmidi_substream *substream)
 112 {
 113         struct snd_rawmidi_runtime *runtime;
 114
 115         runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
 116         if (!runtime)
 117                 return -ENOMEM;
 118         runtime->substream = substream;
 119         spin_lock_init(&runtime->lock);
 120         init_waitqueue_head(&runtime->sleep);
 121         INIT_WORK(&runtime->event_work, snd_rawmidi_input_event_work);
 122         runtime->event = NULL;
 123         runtime->buffer_size = PAGE_SIZE;
 124         runtime->avail_min = 1;
 125         if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
 126                 runtime->avail = 0;
 127         else
 128                 runtime->avail = runtime->buffer_size;
 129         runtime->buffer = kvzalloc(runtime->buffer_size, GFP_KERNEL);
 130         if (!runtime->buffer) {
 131                 kfree(runtime);
 132                 return -ENOMEM;
 133         }
 134         runtime->appl_ptr = runtime->hw_ptr = 0;
 135         substream->runtime = runtime;
 136         return 0;
 137 }
 138
 139 static int snd_rawmidi_runtime_free(struct snd_rawmidi_substream *substream)
 140 {
 141         struct snd_rawmidi_runtime *runtime = substream->runtime;
 142
 143         kvfree(runtime->buffer);
 144         kfree(runtime);
 145         substream->runtime = NULL;
 146         return 0;
 147 }
 148
 149 static inline void snd_rawmidi_output_trigger(struct snd_rawmidi_substream *substream, int up)
 150 {
 151         if (!substream->opened)
 152                 return;
 153         substream->ops->trigger(substream, up);
 154 }
 155
 156 static void snd_rawmidi_input_trigger(struct snd_rawmidi_substream *substream, int up)
 157 {
 158         if (!substream->opened)
 159                 return;
 160         substream->ops->trigger(substream, up);
 161         if (!up)
 162                 cancel_work_sync(&substream->runtime->event_work);
 163 }
 164
 165 static void __reset_runtime_ptrs(struct snd_rawmidi_runtime *runtime,
 166                                  bool is_input)
 167 {
 168         runtime->drain = 0;
 169         runtime->appl_ptr = runtime->hw_ptr = 0;
 170         runtime->avail = is_input ? 0 : runtime->buffer_size;
 171 }
 172
 173 static void reset_runtime_ptrs(struct snd_rawmidi_runtime *runtime,
 174                                bool is_input)
 175 {
 176         unsigned long flags;
 177
 178         spin_lock_irqsave(&runtime->lock, flags);
 179         __reset_runtime_ptrs(runtime, is_input);
 180         spin_unlock_irqrestore(&runtime->lock, flags);
 181 }
 182
 183 int snd_rawmidi_drop_output(struct snd_rawmidi_substream *substream)
 184 {
 185         snd_rawmidi_output_trigger(substream, 0);
 186         reset_runtime_ptrs(substream->runtime, false);
 187         return 0;
 188 }
 189 EXPORT_SYMBOL(snd_rawmidi_drop_output);
 190
 191 int snd_rawmidi_drain_output(struct snd_rawmidi_substream *substream)
 192 {
 193         int err;
 194         long timeout;
 195         struct snd_rawmidi_runtime *runtime = substream->runtime;
 196
 197         err = 0;
 198         runtime->drain = 1;
 199         timeout = wait_event_interruptible_timeout(runtime->sleep,
 200                                 (runtime->avail >= runtime->buffer_size),
 201                                 10*HZ);
 202         if (signal_pending(current))
 203                 err = -ERESTARTSYS;
 204         if (runtime->avail < runtime->buffer_size && !timeout) {
 205                 rmidi_warn(substream->rmidi,
 206                            "rawmidi drain error (avail = %li, buffer_size = %li)\n",
 207                            (long)runtime->avail, (long)runtime->buffer_size);
 208                 err = -EIO;
 209         }
 210         runtime->drain = 0;
 211         if (err != -ERESTARTSYS) {
 212                 /* we need wait a while to make sure that Tx FIFOs are empty */
 213                 if (substream->ops->drain)
 214                         substream->ops->drain(substream);
 215                 else
 216                         msleep(50);
 217                 snd_rawmidi_drop_output(substream);
 218         }
 219         return err;
 220 }
 221 EXPORT_SYMBOL(snd_rawmidi_drain_output);
 222
 223 int snd_rawmidi_drain_input(struct snd_rawmidi_substream *substream)
 224 {
 225         snd_rawmidi_input_trigger(substream, 0);
 226         reset_runtime_ptrs(substream->runtime, true);
 227         return 0;
 228 }
 229 EXPORT_SYMBOL(snd_rawmidi_drain_input);
 230
 231 /* look for an available substream for the given stream direction;
 232  * if a specific subdevice is given, try to assign it
 233  */
 234 static int assign_substream(struct snd_rawmidi *rmidi, int subdevice,
 235                             int stream, int mode,
 236                             struct snd_rawmidi_substream **sub_ret)
 237 {
 238         struct snd_rawmidi_substream *substream;
 239         struct snd_rawmidi_str *s = &rmidi->streams[stream];
 240         static unsigned int info_flags[2] = {
 241                 [SNDRV_RAWMIDI_STREAM_OUTPUT] = SNDRV_RAWMIDI_INFO_OUTPUT,
 242                 [SNDRV_RAWMIDI_STREAM_INPUT] = SNDRV_RAWMIDI_INFO_INPUT,
 243         };
 244
 245         if (!(rmidi->info_flags & info_flags[stream]))
 246                 return -ENXIO;
 247         if (subdevice >= 0 && subdevice >= s->substream_count)
 248                 return -ENODEV;
 249
 250         list_for_each_entry(substream, &s->substreams, list) {
 251                 if (substream->opened) {
 252                         if (stream == SNDRV_RAWMIDI_STREAM_INPUT ||
 253                             !(mode & SNDRV_RAWMIDI_LFLG_APPEND) ||
 254                             !substream->append)
 255                                 continue;
 256                 }
 257                 if (subdevice < 0 || subdevice == substream->number) {
 258                         *sub_ret = substream;
 259                         return 0;
 260                 }
 261         }
 262         return -EAGAIN;
 263 }
 264
 265 /* open and do ref-counting for the given substream */
 266 static int open_substream(struct snd_rawmidi *rmidi,
 267                           struct snd_rawmidi_substream *substream,
 268                           int mode)
 269 {
 270         int err;
 271
 272         if (substream->use_count == 0) {
 273                 err = snd_rawmidi_runtime_create(substream);
 274                 if (err < 0)
 275                         return err;
 276                 err = substream->ops->open(substream);
 277                 if (err < 0) {
 278                         snd_rawmidi_runtime_free(substream);
 279                         return err;
 280                 }
 281                 substream->opened = 1;
 282                 substream->active_sensing = 0;
 283                 if (mode & SNDRV_RAWMIDI_LFLG_APPEND)
 284                         substream->append = 1;
 285                 substream->pid = get_pid(task_pid(current));
 286                 rmidi->streams[substream->stream].substream_opened++;
 287         }
 288         substream->use_count++;
 289         return 0;
 290 }
 291
 292 static void close_substream(struct snd_rawmidi *rmidi,
 293                             struct snd_rawmidi_substream *substream,
 294                             int cleanup);
 295
 296 static int rawmidi_open_priv(struct snd_rawmidi *rmidi, int subdevice, int mode,
 297                              struct snd_rawmidi_file *rfile)
 298 {
 299         struct snd_rawmidi_substream *sinput = NULL, *soutput = NULL;
 300         int err;
 301
 302         rfile->input = rfile->output = NULL;
 303         if (mode & SNDRV_RAWMIDI_LFLG_INPUT) {
 304                 err = assign_substream(rmidi, subdevice,
 305                                        SNDRV_RAWMIDI_STREAM_INPUT,
 306                                        mode, &sinput);
 307                 if (err < 0)
 308                         return err;
 309         }
 310         if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) {
 311                 err = assign_substream(rmidi, subdevice,
 312                                        SNDRV_RAWMIDI_STREAM_OUTPUT,
 313                                        mode, &soutput);
 314                 if (err < 0)
 315                         return err;
 316         }
 317
 318         if (sinput) {
 319                 err = open_substream(rmidi, sinput, mode);
 320                 if (err < 0)
 321                         return err;
 322         }
 323         if (soutput) {
 324                 err = open_substream(rmidi, soutput, mode);
 325                 if (err < 0) {
 326                         if (sinput)
 327                                 close_substream(rmidi, sinput, 0);
 328                         return err;
 329                 }
 330         }
 331
 332         rfile->rmidi = rmidi;
 333         rfile->input = sinput;
 334         rfile->output = soutput;
 335         return 0;
 336 }
 337
 338 /* called from sound/core/seq/seq_midi.c */
 339 int snd_rawmidi_kernel_open(struct snd_card *card, int device, int subdevice,
 340                             int mode, struct snd_rawmidi_file *rfile)
 341 {
 342         struct snd_rawmidi *rmidi;
 343         int err = 0;
 344
 345         if (snd_BUG_ON(!rfile))
 346                 return -EINVAL;
 347
 348         mutex_lock(&register_mutex);
 349         rmidi = snd_rawmidi_search(card, device);
 350         if (!rmidi)
 351                 err = -ENODEV;
 352         else if (!try_module_get(rmidi->card->module))
 353                 err = -ENXIO;
 354         mutex_unlock(&register_mutex);
 355         if (err < 0)
 356                 return err;
 357
 358         mutex_lock(&rmidi->open_mutex);
 359         err = rawmidi_open_priv(rmidi, subdevice, mode, rfile);
 360         mutex_unlock(&rmidi->open_mutex);
 361         if (err < 0)
 362                 module_put(rmidi->card->module);
 363         return err;
 364 }
 365 EXPORT_SYMBOL(snd_rawmidi_kernel_open);
 366
 367 static int snd_rawmidi_open(struct inode *inode, struct file *file)
 368 {
 369         int maj = imajor(inode);
 370         struct snd_card *card;
 371         int subdevice;
 372         unsigned short fflags;
 373         int err;
 374         struct snd_rawmidi *rmidi;
 375         struct snd_rawmidi_file *rawmidi_file = NULL;
 376         wait_queue_entry_t wait;
 377
 378         if ((file->f_flags & O_APPEND) && !(file->f_flags & O_NONBLOCK))
 379                 return -EINVAL;         /* invalid combination */
 380
 381         err = stream_open(inode, file);
 382         if (err < 0)
 383                 return err;
 384
 385         if (maj == snd_major) {
 386                 rmidi = snd_lookup_minor_data(iminor(inode),
 387                                               SNDRV_DEVICE_TYPE_RAWMIDI);
 388 #ifdef CONFIG_SND_OSSEMUL
 389         } else if (maj == SOUND_MAJOR) {
 390                 rmidi = snd_lookup_oss_minor_data(iminor(inode),
 391                                                   SNDRV_OSS_DEVICE_TYPE_MIDI);
 392 #endif
 393         } else
 394                 return -ENXIO;
 395
 396         if (rmidi == NULL)
 397                 return -ENODEV;
 398
 399         if (!try_module_get(rmidi->card->module)) {
 400                 snd_card_unref(rmidi->card);
 401                 return -ENXIO;
 402         }
 403
 404         mutex_lock(&rmidi->open_mutex);
 405         card = rmidi->card;
 406         err = snd_card_file_add(card, file);
 407         if (err < 0)
 408                 goto __error_card;
 409         fflags = snd_rawmidi_file_flags(file);
 410         if ((file->f_flags & O_APPEND) || maj == SOUND_MAJOR) /* OSS emul? */
 411                 fflags |= SNDRV_RAWMIDI_LFLG_APPEND;
 412         rawmidi_file = kmalloc(sizeof(*rawmidi_file), GFP_KERNEL);
 413         if (rawmidi_file == NULL) {
 414                 err = -ENOMEM;
 415                 goto __error;
 416         }
 417         init_waitqueue_entry(&wait, current);
 418         add_wait_queue(&rmidi->open_wait, &wait);
 419         while (1) {
 420                 subdevice = snd_ctl_get_preferred_subdevice(card, SND_CTL_SUBDEV_RAWMIDI);
 421                 err = rawmidi_open_priv(rmidi, subdevice, fflags, rawmidi_file);
 422                 if (err >= 0)
 423                         break;
 424                 if (err == -EAGAIN) {
 425                         if (file->f_flags & O_NONBLOCK) {
 426                                 err = -EBUSY;
 427                                 break;
 428                         }
 429                 } else
 430                         break;
 431                 set_current_state(TASK_INTERRUPTIBLE);
 432                 mutex_unlock(&rmidi->open_mutex);
 433                 schedule();
 434                 mutex_lock(&rmidi->open_mutex);
 435                 if (rmidi->card->shutdown) {
 436                         err = -ENODEV;
 437                         break;
 438                 }
 439                 if (signal_pending(current)) {
 440                         err = -ERESTARTSYS;
 441                         break;
 442                 }
 443         }
 444         remove_wait_queue(&rmidi->open_wait, &wait);
 445         if (err < 0) {
 446                 kfree(rawmidi_file);
 447                 goto __error;
 448         }
 449 #ifdef CONFIG_SND_OSSEMUL
 450         if (rawmidi_file->input && rawmidi_file->input->runtime)
 451                 rawmidi_file->input->runtime->oss = (maj == SOUND_MAJOR);
 452         if (rawmidi_file->output && rawmidi_file->output->runtime)
 453                 rawmidi_file->output->runtime->oss = (maj == SOUND_MAJOR);
 454 #endif
 455         file->private_data = rawmidi_file;
 456         mutex_unlock(&rmidi->open_mutex);
 457         snd_card_unref(rmidi->card);
 458         return 0;
 459
 460  __error:
 461         snd_card_file_remove(card, file);
 462  __error_card:
 463         mutex_unlock(&rmidi->open_mutex);
 464         module_put(rmidi->card->module);
 465         snd_card_unref(rmidi->card);
 466         return err;
 467 }
 468
 469 static void close_substream(struct snd_rawmidi *rmidi,
 470                             struct snd_rawmidi_substream *substream,
 471                             int cleanup)
 472 {
 473         if (--substream->use_count)
 474                 return;
 475
 476         if (cleanup) {
 477                 if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
 478                         snd_rawmidi_input_trigger(substream, 0);
 479                 else {
 480                         if (substream->active_sensing) {
 481                                 unsigned char buf = 0xfe;
 482                                 /* sending single active sensing message
 483                                  * to shut the device up
 484                                  */
 485                                 snd_rawmidi_kernel_write(substream, &buf, 1);
 486                         }
 487                         if (snd_rawmidi_drain_output(substream) == -ERESTARTSYS)
 488                                 snd_rawmidi_output_trigger(substream, 0);
 489                 }
 490         }
 491         substream->ops->close(substream);
 492         if (substream->runtime->private_free)
 493                 substream->runtime->private_free(substream);
 494         snd_rawmidi_runtime_free(substream);
 495         substream->opened = 0;
 496         substream->append = 0;
 497         put_pid(substream->pid);
 498         substream->pid = NULL;
 499         rmidi->streams[substream->stream].substream_opened--;
 500 }
 501
 502 static void rawmidi_release_priv(struct snd_rawmidi_file *rfile)
 503 {
 504         struct snd_rawmidi *rmidi;
 505
 506         rmidi = rfile->rmidi;
 507         mutex_lock(&rmidi->open_mutex);
 508         if (rfile->input) {
 509                 close_substream(rmidi, rfile->input, 1);
 510                 rfile->input = NULL;
 511         }
 512         if (rfile->output) {
 513                 close_substream(rmidi, rfile->output, 1);
 514                 rfile->output = NULL;
 515         }
 516         rfile->rmidi = NULL;
 517         mutex_unlock(&rmidi->open_mutex);
 518         wake_up(&rmidi->open_wait);
 519 }
 520
 521 /* called from sound/core/seq/seq_midi.c */
 522 int snd_rawmidi_kernel_release(struct snd_rawmidi_file *rfile)
 523 {
 524         struct snd_rawmidi *rmidi;
 525
 526         if (snd_BUG_ON(!rfile))
 527                 return -ENXIO;
 528
 529         rmidi = rfile->rmidi;
 530         rawmidi_release_priv(rfile);
 531         module_put(rmidi->card->module);
 532         return 0;
 533 }
 534 EXPORT_SYMBOL(snd_rawmidi_kernel_release);
 535
 536 static int snd_rawmidi_release(struct inode *inode, struct file *file)
 537 {
 538         struct snd_rawmidi_file *rfile;
 539         struct snd_rawmidi *rmidi;
 540         struct module *module;
 541
 542         rfile = file->private_data;
 543         rmidi = rfile->rmidi;
 544         rawmidi_release_priv(rfile);
 545         kfree(rfile);
 546         module = rmidi->card->module;
 547         snd_card_file_remove(rmidi->card, file);
 548         module_put(module);
 549         return 0;
 550 }
 551
 552 static int snd_rawmidi_info(struct snd_rawmidi_substream *substream,
 553                             struct snd_rawmidi_info *info)
 554 {
 555         struct snd_rawmidi *rmidi;
 556
 557         if (substream == NULL)
 558                 return -ENODEV;
 559         rmidi = substream->rmidi;
 560         memset(info, 0, sizeof(*info));
 561         info->card = rmidi->card->number;
 562         info->device = rmidi->device;
 563         info->subdevice = substream->number;
 564         info->stream = substream->stream;
 565         info->flags = rmidi->info_flags;
 566         strcpy(info->id, rmidi->id);
 567         strcpy(info->name, rmidi->name);
 568         strcpy(info->subname, substream->name);
 569         info->subdevices_count = substream->pstr->substream_count;
 570         info->subdevices_avail = (substream->pstr->substream_count -
 571                                   substream->pstr->substream_opened);
 572         return 0;
 573 }
 574
 575 static int snd_rawmidi_info_user(struct snd_rawmidi_substream *substream,
 576                                  struct snd_rawmidi_info __user *_info)
 577 {
 578         struct snd_rawmidi_info info;
 579         int err;
 580
 581         err = snd_rawmidi_info(substream, &info);
 582         if (err < 0)
 583                 return err;
 584         if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
 585                 return -EFAULT;
 586         return 0;
 587 }
 588
 589 static int __snd_rawmidi_info_select(struct snd_card *card,
 590                                      struct snd_rawmidi_info *info)
 591 {
 592         struct snd_rawmidi *rmidi;
 593         struct snd_rawmidi_str *pstr;
 594         struct snd_rawmidi_substream *substream;
 595
 596         rmidi = snd_rawmidi_search(card, info->device);
 597         if (!rmidi)
 598                 return -ENXIO;
 599         if (info->stream < 0 || info->stream > 1)
 600                 return -EINVAL;
 601         info->stream = array_index_nospec(info->stream, 2);
 602         pstr = &rmidi->streams[info->stream];
 603         if (pstr->substream_count == 0)
 604                 return -ENOENT;
 605         if (info->subdevice >= pstr->substream_count)
 606                 return -ENXIO;
 607         list_for_each_entry(substream, &pstr->substreams, list) {
 608                 if ((unsigned int)substream->number == info->subdevice)
 609                         return snd_rawmidi_info(substream, info);
 610         }
 611         return -ENXIO;
 612 }
 613
 614 int snd_rawmidi_info_select(struct snd_card *card, struct snd_rawmidi_info *info)
 615 {
 616         int ret;
 617
 618         mutex_lock(&register_mutex);
 619         ret = __snd_rawmidi_info_select(card, info);
 620         mutex_unlock(&register_mutex);
 621         return ret;
 622 }
 623 EXPORT_SYMBOL(snd_rawmidi_info_select);
 624
 625 static int snd_rawmidi_info_select_user(struct snd_card *card,
 626                                         struct snd_rawmidi_info __user *_info)
 627 {
 628         int err;
 629         struct snd_rawmidi_info info;
 630
 631         if (get_user(info.device, &_info->device))
 632                 return -EFAULT;
 633         if (get_user(info.stream, &_info->stream))
 634                 return -EFAULT;
 635         if (get_user(info.subdevice, &_info->subdevice))
 636                 return -EFAULT;
 637         err = snd_rawmidi_info_select(card, &info);
 638         if (err < 0)
 639                 return err;
 640         if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
 641                 return -EFAULT;
 642         return 0;
 643 }
 644
 645 static int resize_runtime_buffer(struct snd_rawmidi_runtime *runtime,
 646                                  struct snd_rawmidi_params *params,
 647                                  bool is_input)
 648 {
 649         char *newbuf, *oldbuf;
 650
 651         if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L)
 652                 return -EINVAL;
 653         if (params->avail_min < 1 || params->avail_min > params->buffer_size)
 654                 return -EINVAL;
 655         if (params->buffer_size != runtime->buffer_size) {
 656                 newbuf = kvzalloc(params->buffer_size, GFP_KERNEL);
 657                 if (!newbuf)
 658                         return -ENOMEM;
 659                 spin_lock_irq(&runtime->lock);
 660                 if (runtime->buffer_ref) {
 661                         spin_unlock_irq(&runtime->lock);
 662                         kvfree(newbuf);
 663                         return -EBUSY;
 664                 }
 665                 oldbuf = runtime->buffer;
 666                 runtime->buffer = newbuf;
 667                 runtime->buffer_size = params->buffer_size;
 668                 __reset_runtime_ptrs(runtime, is_input);
 669                 spin_unlock_irq(&runtime->lock);
 670                 kvfree(oldbuf);
 671         }
 672         runtime->avail_min = params->avail_min;
 673         return 0;
 674 }
 675
 676 int snd_rawmidi_output_params(struct snd_rawmidi_substream *substream,
 677                               struct snd_rawmidi_params *params)
 678 {
 679         if (substream->append && substream->use_count > 1)
 680                 return -EBUSY;
 681         snd_rawmidi_drain_output(substream);
 682         substream->active_sensing = !params->no_active_sensing;
 683         return resize_runtime_buffer(substream->runtime, params, false);
 684 }
 685 EXPORT_SYMBOL(snd_rawmidi_output_params);
 686
 687 int snd_rawmidi_input_params(struct snd_rawmidi_substream *substream,
 688                              struct snd_rawmidi_params *params)
 689 {
 690         snd_rawmidi_drain_input(substream);
 691         return resize_runtime_buffer(substream->runtime, params, true);
 692 }
 693 EXPORT_SYMBOL(snd_rawmidi_input_params);
 694
 695 static int snd_rawmidi_output_status(struct snd_rawmidi_substream *substream,
 696                                      struct snd_rawmidi_status *status)
 697 {
 698         struct snd_rawmidi_runtime *runtime = substream->runtime;
 699
 700         memset(status, 0, sizeof(*status));
 701         status->stream = SNDRV_RAWMIDI_STREAM_OUTPUT;
 702         spin_lock_irq(&runtime->lock);
 703         status->avail = runtime->avail;
 704         spin_unlock_irq(&runtime->lock);
 705         return 0;
 706 }
 707
 708 static int snd_rawmidi_input_status(struct snd_rawmidi_substream *substream,
 709                                     struct snd_rawmidi_status *status)
 710 {
 711         struct snd_rawmidi_runtime *runtime = substream->runtime;
 712
 713         memset(status, 0, sizeof(*status));
 714         status->stream = SNDRV_RAWMIDI_STREAM_INPUT;
 715         spin_lock_irq(&runtime->lock);
 716         status->avail = runtime->avail;
 717         status->xruns = runtime->xruns;
 718         runtime->xruns = 0;
 719         spin_unlock_irq(&runtime->lock);
 720         return 0;
 721 }
 722
 723 static long snd_rawmidi_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 724 {
 725         struct snd_rawmidi_file *rfile;
 726         void __user *argp = (void __user *)arg;
 727
 728         rfile = file->private_data;
 729         if (((cmd >> 8) & 0xff) != 'W')
 730                 return -ENOTTY;
 731         switch (cmd) {
 732         case SNDRV_RAWMIDI_IOCTL_PVERSION:
 733                 return put_user(SNDRV_RAWMIDI_VERSION, (int __user *)argp) ? -EFAULT : 0;
 734         case SNDRV_RAWMIDI_IOCTL_INFO:
 735         {
 736                 int stream;
 737                 struct snd_rawmidi_info __user *info = argp;
 738
 739                 if (get_user(stream, &info->stream))
 740                         return -EFAULT;
 741                 switch (stream) {
 742                 case SNDRV_RAWMIDI_STREAM_INPUT:
 743                         return snd_rawmidi_info_user(rfile->input, info);
 744                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
 745                         return snd_rawmidi_info_user(rfile->output, info);
 746                 default:
 747                         return -EINVAL;
 748                 }
 749         }
 750         case SNDRV_RAWMIDI_IOCTL_PARAMS:
 751         {
 752                 struct snd_rawmidi_params params;
 753
 754                 if (copy_from_user(&params, argp, sizeof(struct snd_rawmidi_params)))
 755                         return -EFAULT;
 756                 switch (params.stream) {
 757                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
 758                         if (rfile->output == NULL)
 759                                 return -EINVAL;
 760                         return snd_rawmidi_output_params(rfile->output, &params);
 761                 case SNDRV_RAWMIDI_STREAM_INPUT:
 762                         if (rfile->input == NULL)
 763                                 return -EINVAL;
 764                         return snd_rawmidi_input_params(rfile->input, &params);
 765                 default:
 766                         return -EINVAL;
 767                 }
 768         }
 769         case SNDRV_RAWMIDI_IOCTL_STATUS:
 770         {
 771                 int err = 0;
 772                 struct snd_rawmidi_status status;
 773
 774                 if (copy_from_user(&status, argp, sizeof(struct snd_rawmidi_status)))
 775                         return -EFAULT;
 776                 switch (status.stream) {
 777                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
 778                         if (rfile->output == NULL)
 779                                 return -EINVAL;
 780                         err = snd_rawmidi_output_status(rfile->output, &status);
 781                         break;
 782                 case SNDRV_RAWMIDI_STREAM_INPUT:
 783                         if (rfile->input == NULL)
 784                                 return -EINVAL;
 785                         err = snd_rawmidi_input_status(rfile->input, &status);
 786                         break;
 787                 default:
 788                         return -EINVAL;
 789                 }
 790                 if (err < 0)
 791                         return err;
 792                 if (copy_to_user(argp, &status, sizeof(struct snd_rawmidi_status)))
 793                         return -EFAULT;
 794                 return 0;
 795         }
 796         case SNDRV_RAWMIDI_IOCTL_DROP:
 797         {
 798                 int val;
 799
 800                 if (get_user(val, (int __user *) argp))
 801                         return -EFAULT;
 802                 switch (val) {
 803                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
 804                         if (rfile->output == NULL)
 805                                 return -EINVAL;
 806                         return snd_rawmidi_drop_output(rfile->output);
 807                 default:
 808                         return -EINVAL;
 809                 }
 810         }
 811         case SNDRV_RAWMIDI_IOCTL_DRAIN:
 812         {
 813                 int val;
 814
 815                 if (get_user(val, (int __user *) argp))
 816                         return -EFAULT;
 817                 switch (val) {
 818                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
 819                         if (rfile->output == NULL)
 820                                 return -EINVAL;
 821                         return snd_rawmidi_drain_output(rfile->output);
 822                 case SNDRV_RAWMIDI_STREAM_INPUT:
 823                         if (rfile->input == NULL)
 824                                 return -EINVAL;
 825                         return snd_rawmidi_drain_input(rfile->input);
 826                 default:
 827                         return -EINVAL;
 828                 }
 829         }
 830         default:
 831                 rmidi_dbg(rfile->rmidi,
 832                           "rawmidi: unknown command = 0x%x\n", cmd);
 833         }
 834         return -ENOTTY;
 835 }
 836
 837 static int snd_rawmidi_control_ioctl(struct snd_card *card,
 838                                      struct snd_ctl_file *control,
 839                                      unsigned int cmd,
 840                                      unsigned long arg)
 841 {
 842         void __user *argp = (void __user *)arg;
 843
 844         switch (cmd) {
 845         case SNDRV_CTL_IOCTL_RAWMIDI_NEXT_DEVICE:
 846         {
 847                 int device;
 848
 849                 if (get_user(device, (int __user *)argp))
 850                         return -EFAULT;
 851                 if (device >= SNDRV_RAWMIDI_DEVICES) /* next device is -1 */
 852                         device = SNDRV_RAWMIDI_DEVICES - 1;
 853                 mutex_lock(&register_mutex);
 854                 device = device < 0 ? 0 : device + 1;
 855                 while (device < SNDRV_RAWMIDI_DEVICES) {
 856                         if (snd_rawmidi_search(card, device))
 857                                 break;
 858                         device++;
 859                 }
 860                 if (device == SNDRV_RAWMIDI_DEVICES)
 861                         device = -1;
 862                 mutex_unlock(&register_mutex);
 863                 if (put_user(device, (int __user *)argp))
 864                         return -EFAULT;
 865                 return 0;
 866         }
 867         case SNDRV_CTL_IOCTL_RAWMIDI_PREFER_SUBDEVICE:
 868         {
 869                 int val;
 870
 871                 if (get_user(val, (int __user *)argp))
 872                         return -EFAULT;
 873                 control->preferred_subdevice[SND_CTL_SUBDEV_RAWMIDI] = val;
 874                 return 0;
 875         }
 876         case SNDRV_CTL_IOCTL_RAWMIDI_INFO:
 877                 return snd_rawmidi_info_select_user(card, argp);
 878         }
 879         return -ENOIOCTLCMD;
 880 }
 881
 882 /**
 883  * snd_rawmidi_receive - receive the input data from the device
 884  * @substream: the rawmidi substream
 885  * @buffer: the buffer pointer
 886  * @count: the data size to read
 887  *
 888  * Reads the data from the internal buffer.
 889  *
 890  * Return: The size of read data, or a negative error code on failure.
 891  */
 892 int snd_rawmidi_receive(struct snd_rawmidi_substream *substream,
 893                         const unsigned char *buffer, int count)
 894 {
 895         unsigned long flags;
 896         int result = 0, count1;
 897         struct snd_rawmidi_runtime *runtime = substream->runtime;
 898
 899         if (!substream->opened)
 900                 return -EBADFD;
 901         if (runtime->buffer == NULL) {
 902                 rmidi_dbg(substream->rmidi,
 903                           "snd_rawmidi_receive: input is not active!!!\n");
 904                 return -EINVAL;
 905         }
 906         spin_lock_irqsave(&runtime->lock, flags);
 907         if (count == 1) {       /* special case, faster code */
 908                 substream->bytes++;
 909                 if (runtime->avail < runtime->buffer_size) {
 910                         runtime->buffer[runtime->hw_ptr++] = buffer[0];
 911                         runtime->hw_ptr %= runtime->buffer_size;
 912                         runtime->avail++;
 913                         result++;
 914                 } else {
 915                         runtime->xruns++;
 916                 }
 917         } else {
 918                 substream->bytes += count;
 919                 count1 = runtime->buffer_size - runtime->hw_ptr;
 920                 if (count1 > count)
 921                         count1 = count;
 922                 if (count1 > (int)(runtime->buffer_size - runtime->avail))
 923                         count1 = runtime->buffer_size - runtime->avail;
 924                 memcpy(runtime->buffer + runtime->hw_ptr, buffer, count1);
 925                 runtime->hw_ptr += count1;
 926                 runtime->hw_ptr %= runtime->buffer_size;
 927                 runtime->avail += count1;
 928                 count -= count1;
 929                 result += count1;
 930                 if (count > 0) {
 931                         buffer += count1;
 932                         count1 = count;
 933                         if (count1 > (int)(runtime->buffer_size - runtime->avail)) {
 934                                 count1 = runtime->buffer_size - runtime->avail;
 935                                 runtime->xruns += count - count1;
 936                         }
 937                         if (count1 > 0) {
 938                                 memcpy(runtime->buffer, buffer, count1);
 939                                 runtime->hw_ptr = count1;
 940                                 runtime->avail += count1;
 941                                 result += count1;
 942                         }
 943                 }
 944         }
 945         if (result > 0) {
 946                 if (runtime->event)
 947                         schedule_work(&runtime->event_work);
 948                 else if (snd_rawmidi_ready(substream))
 949                         wake_up(&runtime->sleep);
 950         }
 951         spin_unlock_irqrestore(&runtime->lock, flags);
 952         return result;
 953 }
 954 EXPORT_SYMBOL(snd_rawmidi_receive);
 955
 956 static long snd_rawmidi_kernel_read1(struct snd_rawmidi_substream *substream,
 957                                      unsigned char __user *userbuf,
 958                                      unsigned char *kernelbuf, long count)
 959 {
 960         unsigned long flags;
 961         long result = 0, count1;
 962         struct snd_rawmidi_runtime *runtime = substream->runtime;
 963         unsigned long appl_ptr;
 964         int err = 0;
 965
 966         spin_lock_irqsave(&runtime->lock, flags);
 967         snd_rawmidi_buffer_ref(runtime);
 968         while (count > 0 && runtime->avail) {
 969                 count1 = runtime->buffer_size - runtime->appl_ptr;
 970                 if (count1 > count)
 971                         count1 = count;
 972                 if (count1 > (int)runtime->avail)
 973                         count1 = runtime->avail;
 974
 975                 /* update runtime->appl_ptr before unlocking for userbuf */
 976                 appl_ptr = runtime->appl_ptr;
 977                 runtime->appl_ptr += count1;
 978                 runtime->appl_ptr %= runtime->buffer_size;
 979                 runtime->avail -= count1;
 980
 981                 if (kernelbuf)
 982                         memcpy(kernelbuf + result, runtime->buffer + appl_ptr, count1);
 983                 if (userbuf) {
 984                         spin_unlock_irqrestore(&runtime->lock, flags);
 985                         if (copy_to_user(userbuf + result,
 986                                          runtime->buffer + appl_ptr, count1))
 987                                 err = -EFAULT;
 988                         spin_lock_irqsave(&runtime->lock, flags);
 989                         if (err)
 990                                 goto out;
 991                 }
 992                 result += count1;
 993                 count -= count1;
 994         }
 995  out:
 996         snd_rawmidi_buffer_unref(runtime);
 997         spin_unlock_irqrestore(&runtime->lock, flags);
 998         return result > 0 ? result : err;
 999 }
1000
1001 long snd_rawmidi_kernel_read(struct snd_rawmidi_substream *substream,
1002                              unsigned char *buf, long count)
1003 {
1004         snd_rawmidi_input_trigger(substream, 1);
1005         return snd_rawmidi_kernel_read1(substream, NULL/*userbuf*/, buf, count);
1006 }
1007 EXPORT_SYMBOL(snd_rawmidi_kernel_read);
1008
1009 static ssize_t snd_rawmidi_read(struct file *file, char __user *buf, size_t count,
1010                                 loff_t *offset)
1011 {
1012         long result;
1013         int count1;
1014         struct snd_rawmidi_file *rfile;
1015         struct snd_rawmidi_substream *substream;
1016         struct snd_rawmidi_runtime *runtime;
1017
1018         rfile = file->private_data;
1019         substream = rfile->input;
1020         if (substream == NULL)
1021                 return -EIO;
1022         runtime = substream->runtime;
1023         snd_rawmidi_input_trigger(substream, 1);
1024         result = 0;
1025         while (count > 0) {
1026                 spin_lock_irq(&runtime->lock);
1027                 while (!snd_rawmidi_ready(substream)) {
1028                         wait_queue_entry_t wait;
1029
1030                         if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1031                                 spin_unlock_irq(&runtime->lock);
1032                                 return result > 0 ? result : -EAGAIN;
1033                         }
1034                         init_waitqueue_entry(&wait, current);
1035                         add_wait_queue(&runtime->sleep, &wait);
1036                         set_current_state(TASK_INTERRUPTIBLE);
1037                         spin_unlock_irq(&runtime->lock);
1038                         schedule();
1039                         remove_wait_queue(&runtime->sleep, &wait);
1040                         if (rfile->rmidi->card->shutdown)
1041                                 return -ENODEV;
1042                         if (signal_pending(current))
1043                                 return result > 0 ? result : -ERESTARTSYS;
1044                         if (!runtime->avail)
1045                                 return result > 0 ? result : -EIO;
1046                         spin_lock_irq(&runtime->lock);
1047                 }
1048                 spin_unlock_irq(&runtime->lock);
1049                 count1 = snd_rawmidi_kernel_read1(substream,
1050                                                   (unsigned char __user *)buf,
1051                                                   NULL/*kernelbuf*/,
1052                                                   count);
1053                 if (count1 < 0)
1054                         return result > 0 ? result : count1;
1055                 result += count1;
1056                 buf += count1;
1057                 count -= count1;
1058         }
1059         return result;
1060 }
1061
1062 /**
1063  * snd_rawmidi_transmit_empty - check whether the output buffer is empty
1064  * @substream: the rawmidi substream
1065  *
1066  * Return: 1 if the internal output buffer is empty, 0 if not.
1067  */
1068 int snd_rawmidi_transmit_empty(struct snd_rawmidi_substream *substream)
1069 {
1070         struct snd_rawmidi_runtime *runtime = substream->runtime;
1071         int result;
1072         unsigned long flags;
1073
1074         if (runtime->buffer == NULL) {
1075                 rmidi_dbg(substream->rmidi,
1076                           "snd_rawmidi_transmit_empty: output is not active!!!\n");
1077                 return 1;
1078         }
1079         spin_lock_irqsave(&runtime->lock, flags);
1080         result = runtime->avail >= runtime->buffer_size;
1081         spin_unlock_irqrestore(&runtime->lock, flags);
1082         return result;
1083 }
1084 EXPORT_SYMBOL(snd_rawmidi_transmit_empty);
1085
1086 /**
1087  * __snd_rawmidi_transmit_peek - copy data from the internal buffer
1088  * @substream: the rawmidi substream
1089  * @buffer: the buffer pointer
1090  * @count: data size to transfer
1091  *
1092  * This is a variant of snd_rawmidi_transmit_peek() without spinlock.
1093  */
1094 int __snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
1095                               unsigned char *buffer, int count)
1096 {
1097         int result, count1;
1098         struct snd_rawmidi_runtime *runtime = substream->runtime;
1099
1100         if (runtime->buffer == NULL) {
1101                 rmidi_dbg(substream->rmidi,
1102                           "snd_rawmidi_transmit_peek: output is not active!!!\n");
1103                 return -EINVAL;
1104         }
1105         result = 0;
1106         if (runtime->avail >= runtime->buffer_size) {
1107                 /* warning: lowlevel layer MUST trigger down the hardware */
1108                 goto __skip;
1109         }
1110         if (count == 1) {       /* special case, faster code */
1111                 *buffer = runtime->buffer[runtime->hw_ptr];
1112                 result++;
1113         } else {
1114                 count1 = runtime->buffer_size - runtime->hw_ptr;
1115                 if (count1 > count)
1116                         count1 = count;
1117                 if (count1 > (int)(runtime->buffer_size - runtime->avail))
1118                         count1 = runtime->buffer_size - runtime->avail;
1119                 memcpy(buffer, runtime->buffer + runtime->hw_ptr, count1);
1120                 count -= count1;
1121                 result += count1;
1122                 if (count > 0) {
1123                         if (count > (int)(runtime->buffer_size - runtime->avail - count1))
1124                                 count = runtime->buffer_size - runtime->avail - count1;
1125                         memcpy(buffer + count1, runtime->buffer, count);
1126                         result += count;
1127                 }
1128         }
1129       __skip:
1130         return result;
1131 }
1132 EXPORT_SYMBOL(__snd_rawmidi_transmit_peek);
1133
1134 /**
1135  * snd_rawmidi_transmit_peek - copy data from the internal buffer
1136  * @substream: the rawmidi substream
1137  * @buffer: the buffer pointer
1138  * @count: data size to transfer
1139  *
1140  * Copies data from the internal output buffer to the given buffer.
1141  *
1142  * Call this in the interrupt handler when the midi output is ready,
1143  * and call snd_rawmidi_transmit_ack() after the transmission is
1144  * finished.
1145  *
1146  * Return: The size of copied data, or a negative error code on failure.
1147  */
1148 int snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
1149                               unsigned char *buffer, int count)
1150 {
1151         struct snd_rawmidi_runtime *runtime = substream->runtime;
1152         int result;
1153         unsigned long flags;
1154
1155         spin_lock_irqsave(&runtime->lock, flags);
1156         result = __snd_rawmidi_transmit_peek(substream, buffer, count);
1157         spin_unlock_irqrestore(&runtime->lock, flags);
1158         return result;
1159 }
1160 EXPORT_SYMBOL(snd_rawmidi_transmit_peek);
1161
1162 /**
1163  * __snd_rawmidi_transmit_ack - acknowledge the transmission
1164  * @substream: the rawmidi substream
1165  * @count: the transferred count
1166  *
1167  * This is a variant of __snd_rawmidi_transmit_ack() without spinlock.
1168  */
1169 int __snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count)
1170 {
1171         struct snd_rawmidi_runtime *runtime = substream->runtime;
1172
1173         if (runtime->buffer == NULL) {
1174                 rmidi_dbg(substream->rmidi,
1175                           "snd_rawmidi_transmit_ack: output is not active!!!\n");
1176                 return -EINVAL;
1177         }
1178         snd_BUG_ON(runtime->avail + count > runtime->buffer_size);
1179         runtime->hw_ptr += count;
1180         runtime->hw_ptr %= runtime->buffer_size;
1181         runtime->avail += count;
1182         substream->bytes += count;
1183         if (count > 0) {
1184                 if (runtime->drain || snd_rawmidi_ready(substream))
1185                         wake_up(&runtime->sleep);
1186         }
1187         return count;
1188 }
1189 EXPORT_SYMBOL(__snd_rawmidi_transmit_ack);
1190
1191 /**
1192  * snd_rawmidi_transmit_ack - acknowledge the transmission
1193  * @substream: the rawmidi substream
1194  * @count: the transferred count
1195  *
1196  * Advances the hardware pointer for the internal output buffer with
1197  * the given size and updates the condition.
1198  * Call after the transmission is finished.
1199  *
1200  * Return: The advanced size if successful, or a negative error code on failure.
1201  */
1202 int snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count)
1203 {
1204         struct snd_rawmidi_runtime *runtime = substream->runtime;
1205         int result;
1206         unsigned long flags;
1207
1208         spin_lock_irqsave(&runtime->lock, flags);
1209         result = __snd_rawmidi_transmit_ack(substream, count);
1210         spin_unlock_irqrestore(&runtime->lock, flags);
1211         return result;
1212 }
1213 EXPORT_SYMBOL(snd_rawmidi_transmit_ack);
1214
1215 /**
1216  * snd_rawmidi_transmit - copy from the buffer to the device
1217  * @substream: the rawmidi substream
1218  * @buffer: the buffer pointer
1219  * @count: the data size to transfer
1220  *
1221  * Copies data from the buffer to the device and advances the pointer.
1222  *
1223  * Return: The copied size if successful, or a negative error code on failure.
1224  */
1225 int snd_rawmidi_transmit(struct snd_rawmidi_substream *substream,
1226                          unsigned char *buffer, int count)
1227 {
1228         struct snd_rawmidi_runtime *runtime = substream->runtime;
1229         int result;
1230         unsigned long flags;
1231
1232         spin_lock_irqsave(&runtime->lock, flags);
1233         if (!substream->opened)
1234                 result = -EBADFD;
1235         else {
1236                 count = __snd_rawmidi_transmit_peek(substream, buffer, count);
1237                 if (count <= 0)
1238                         result = count;
1239                 else
1240                         result = __snd_rawmidi_transmit_ack(substream, count);
1241         }
1242         spin_unlock_irqrestore(&runtime->lock, flags);
1243         return result;
1244 }
1245 EXPORT_SYMBOL(snd_rawmidi_transmit);
1246
1247 /**
1248  * snd_rawmidi_proceed - Discard the all pending bytes and proceed
1249  * @substream: rawmidi substream
1250  *
1251  * Return: the number of discarded bytes
1252  */
1253 int snd_rawmidi_proceed(struct snd_rawmidi_substream *substream)
1254 {
1255         struct snd_rawmidi_runtime *runtime = substream->runtime;
1256         unsigned long flags;
1257         int count = 0;
1258
1259         spin_lock_irqsave(&runtime->lock, flags);
1260         if (runtime->avail < runtime->buffer_size) {
1261                 count = runtime->buffer_size - runtime->avail;
1262                 __snd_rawmidi_transmit_ack(substream, count);
1263         }
1264         spin_unlock_irqrestore(&runtime->lock, flags);
1265         return count;
1266 }
1267 EXPORT_SYMBOL(snd_rawmidi_proceed);
1268
1269 static long snd_rawmidi_kernel_write1(struct snd_rawmidi_substream *substream,
1270                                       const unsigned char __user *userbuf,
1271                                       const unsigned char *kernelbuf,
1272                                       long count)
1273 {
1274         unsigned long flags;
1275         long count1, result;
1276         struct snd_rawmidi_runtime *runtime = substream->runtime;
1277         unsigned long appl_ptr;
1278
1279         if (!kernelbuf && !userbuf)
1280                 return -EINVAL;
1281         if (snd_BUG_ON(!runtime->buffer))
1282                 return -EINVAL;
1283
1284         result = 0;
1285         spin_lock_irqsave(&runtime->lock, flags);
1286         if (substream->append) {
1287                 if ((long)runtime->avail < count) {
1288                         spin_unlock_irqrestore(&runtime->lock, flags);
1289                         return -EAGAIN;
1290                 }
1291         }
1292         snd_rawmidi_buffer_ref(runtime);
1293         while (count > 0 && runtime->avail > 0) {
1294                 count1 = runtime->buffer_size - runtime->appl_ptr;
1295                 if (count1 > count)
1296                         count1 = count;
1297                 if (count1 > (long)runtime->avail)
1298                         count1 = runtime->avail;
1299
1300                 /* update runtime->appl_ptr before unlocking for userbuf */
1301                 appl_ptr = runtime->appl_ptr;
1302                 runtime->appl_ptr += count1;
1303                 runtime->appl_ptr %= runtime->buffer_size;
1304                 runtime->avail -= count1;
1305
1306                 if (kernelbuf)
1307                         memcpy(runtime->buffer + appl_ptr,
1308                                kernelbuf + result, count1);
1309                 else if (userbuf) {
1310                         spin_unlock_irqrestore(&runtime->lock, flags);
1311                         if (copy_from_user(runtime->buffer + appl_ptr,
1312                                            userbuf + result, count1)) {
1313                                 spin_lock_irqsave(&runtime->lock, flags);
1314                                 result = result > 0 ? result : -EFAULT;
1315                                 goto __end;
1316                         }
1317                         spin_lock_irqsave(&runtime->lock, flags);
1318                 }
1319                 result += count1;
1320                 count -= count1;
1321         }
1322       __end:
1323         count1 = runtime->avail < runtime->buffer_size;
1324         snd_rawmidi_buffer_unref(runtime);
1325         spin_unlock_irqrestore(&runtime->lock, flags);
1326         if (count1)
1327                 snd_rawmidi_output_trigger(substream, 1);
1328         return result;
1329 }
1330
1331 long snd_rawmidi_kernel_write(struct snd_rawmidi_substream *substream,
1332                               const unsigned char *buf, long count)
1333 {
1334         return snd_rawmidi_kernel_write1(substream, NULL, buf, count);
1335 }
1336 EXPORT_SYMBOL(snd_rawmidi_kernel_write);
1337
1338 static ssize_t snd_rawmidi_write(struct file *file, const char __user *buf,
1339                                  size_t count, loff_t *offset)
1340 {
1341         long result, timeout;
1342         int count1;
1343         struct snd_rawmidi_file *rfile;
1344         struct snd_rawmidi_runtime *runtime;
1345         struct snd_rawmidi_substream *substream;
1346
1347         rfile = file->private_data;
1348         substream = rfile->output;
1349         runtime = substream->runtime;
1350         /* we cannot put an atomic message to our buffer */
1351         if (substream->append && count > runtime->buffer_size)
1352                 return -EIO;
1353         result = 0;
1354         while (count > 0) {
1355                 spin_lock_irq(&runtime->lock);
1356                 while (!snd_rawmidi_ready_append(substream, count)) {
1357                         wait_queue_entry_t wait;
1358
1359                         if (file->f_flags & O_NONBLOCK) {
1360                                 spin_unlock_irq(&runtime->lock);
1361                                 return result > 0 ? result : -EAGAIN;
1362                         }
1363                         init_waitqueue_entry(&wait, current);
1364                         add_wait_queue(&runtime->sleep, &wait);
1365                         set_current_state(TASK_INTERRUPTIBLE);
1366                         spin_unlock_irq(&runtime->lock);
1367                         timeout = schedule_timeout(30 * HZ);
1368                         remove_wait_queue(&runtime->sleep, &wait);
1369                         if (rfile->rmidi->card->shutdown)
1370                                 return -ENODEV;
1371                         if (signal_pending(current))
1372                                 return result > 0 ? result : -ERESTARTSYS;
1373                         if (!runtime->avail && !timeout)
1374                                 return result > 0 ? result : -EIO;
1375                         spin_lock_irq(&runtime->lock);
1376                 }
1377                 spin_unlock_irq(&runtime->lock);
1378                 count1 = snd_rawmidi_kernel_write1(substream, buf, NULL, count);
1379                 if (count1 < 0)
1380                         return result > 0 ? result : count1;
1381                 result += count1;
1382                 buf += count1;
1383                 if ((size_t)count1 < count && (file->f_flags & O_NONBLOCK))
1384                         break;
1385                 count -= count1;
1386         }
1387         if (file->f_flags & O_DSYNC) {
1388                 spin_lock_irq(&runtime->lock);
1389                 while (runtime->avail != runtime->buffer_size) {
1390                         wait_queue_entry_t wait;
1391                         unsigned int last_avail = runtime->avail;
1392
1393                         init_waitqueue_entry(&wait, current);
1394                         add_wait_queue(&runtime->sleep, &wait);
1395                         set_current_state(TASK_INTERRUPTIBLE);
1396                         spin_unlock_irq(&runtime->lock);
1397                         timeout = schedule_timeout(30 * HZ);
1398                         remove_wait_queue(&runtime->sleep, &wait);
1399                         if (signal_pending(current))
1400                                 return result > 0 ? result : -ERESTARTSYS;
1401                         if (runtime->avail == last_avail && !timeout)
1402                                 return result > 0 ? result : -EIO;
1403                         spin_lock_irq(&runtime->lock);
1404                 }
1405                 spin_unlock_irq(&runtime->lock);
1406         }
1407         return result;
1408 }
1409
1410 static __poll_t snd_rawmidi_poll(struct file *file, poll_table *wait)
1411 {
1412         struct snd_rawmidi_file *rfile;
1413         struct snd_rawmidi_runtime *runtime;
1414         __poll_t mask;
1415
1416         rfile = file->private_data;
1417         if (rfile->input != NULL) {
1418                 runtime = rfile->input->runtime;
1419                 snd_rawmidi_input_trigger(rfile->input, 1);
1420                 poll_wait(file, &runtime->sleep, wait);
1421         }
1422         if (rfile->output != NULL) {
1423                 runtime = rfile->output->runtime;
1424                 poll_wait(file, &runtime->sleep, wait);
1425         }
1426         mask = 0;
1427         if (rfile->input != NULL) {
1428                 if (snd_rawmidi_ready(rfile->input))
1429                         mask |= EPOLLIN | EPOLLRDNORM;
1430         }
1431         if (rfile->output != NULL) {
1432                 if (snd_rawmidi_ready(rfile->output))
1433                         mask |= EPOLLOUT | EPOLLWRNORM;
1434         }
1435         return mask;
1436 }
1437
1438 /*
1439  */
1440 #ifdef CONFIG_COMPAT
1441 #include "rawmidi_compat.c"
1442 #else
1443 #define snd_rawmidi_ioctl_compat        NULL
1444 #endif
1445
1446 /*
1447  */
1448
1449 static void snd_rawmidi_proc_info_read(struct snd_info_entry *entry,
1450                                        struct snd_info_buffer *buffer)
1451 {
1452         struct snd_rawmidi *rmidi;
1453         struct snd_rawmidi_substream *substream;
1454         struct snd_rawmidi_runtime *runtime;
1455
1456         rmidi = entry->private_data;
1457         snd_iprintf(buffer, "%s\n\n", rmidi->name);
1458         mutex_lock(&rmidi->open_mutex);
1459         if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_OUTPUT) {
1460                 list_for_each_entry(substream,
1461                                     &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams,
1462                                     list) {
1463                         snd_iprintf(buffer,
1464                                     "Output %d\n"
1465                                     "  Tx bytes     : %lu\n",
1466                                     substream->number,
1467                                     (unsigned long) substream->bytes);
1468                         if (substream->opened) {
1469                                 snd_iprintf(buffer,
1470                                     "  Owner PID    : %d\n",
1471                                     pid_vnr(substream->pid));
1472                                 runtime = substream->runtime;
1473                                 snd_iprintf(buffer,
1474                                     "  Mode         : %s\n"
1475                                     "  Buffer size  : %lu\n"
1476                                     "  Avail        : %lu\n",
1477                                     runtime->oss ? "OSS compatible" : "native",
1478                                     (unsigned long) runtime->buffer_size,
1479                                     (unsigned long) runtime->avail);
1480                         }
1481                 }
1482         }
1483         if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_INPUT) {
1484                 list_for_each_entry(substream,
1485                                     &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams,
1486                                     list) {
1487                         snd_iprintf(buffer,
1488                                     "Input %d\n"
1489                                     "  Rx bytes     : %lu\n",
1490                                     substream->number,
1491                                     (unsigned long) substream->bytes);
1492                         if (substream->opened) {
1493                                 snd_iprintf(buffer,
1494                                             "  Owner PID    : %d\n",
1495                                             pid_vnr(substream->pid));
1496                                 runtime = substream->runtime;
1497                                 snd_iprintf(buffer,
1498                                             "  Buffer size  : %lu\n"
1499                                             "  Avail        : %lu\n"
1500                                             "  Overruns     : %lu\n",
1501                                             (unsigned long) runtime->buffer_size,
1502                                             (unsigned long) runtime->avail,
1503                                             (unsigned long) runtime->xruns);
1504                         }
1505                 }
1506         }
1507         mutex_unlock(&rmidi->open_mutex);
1508 }
1509
1510 /*
1511  *  Register functions
1512  */
1513
1514 static const struct file_operations snd_rawmidi_f_ops = {
1515         .owner =        THIS_MODULE,
1516         .read =         snd_rawmidi_read,
1517         .write =        snd_rawmidi_write,
1518         .open =         snd_rawmidi_open,
1519         .release =      snd_rawmidi_release,
1520         .llseek =       no_llseek,
1521         .poll =         snd_rawmidi_poll,
1522         .unlocked_ioctl =       snd_rawmidi_ioctl,
1523         .compat_ioctl = snd_rawmidi_ioctl_compat,
1524 };
1525
1526 static int snd_rawmidi_alloc_substreams(struct snd_rawmidi *rmidi,
1527                                         struct snd_rawmidi_str *stream,
1528                                         int direction,
1529                                         int count)
1530 {
1531         struct snd_rawmidi_substream *substream;
1532         int idx;
1533
1534         for (idx = 0; idx < count; idx++) {
1535                 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
1536                 if (!substream)
1537                         return -ENOMEM;
1538                 substream->stream = direction;
1539                 substream->number = idx;
1540                 substream->rmidi = rmidi;
1541                 substream->pstr = stream;
1542                 list_add_tail(&substream->list, &stream->substreams);
1543                 stream->substream_count++;
1544         }
1545         return 0;
1546 }
1547
1548 static void release_rawmidi_device(struct device *dev)
1549 {
1550         kfree(container_of(dev, struct snd_rawmidi, dev));
1551 }
1552
1553 /**
1554  * snd_rawmidi_new - create a rawmidi instance
1555  * @card: the card instance
1556  * @id: the id string
1557  * @device: the device index
1558  * @output_count: the number of output streams
1559  * @input_count: the number of input streams
1560  * @rrawmidi: the pointer to store the new rawmidi instance
1561  *
1562  * Creates a new rawmidi instance.
1563  * Use snd_rawmidi_set_ops() to set the operators to the new instance.
1564  *
1565  * Return: Zero if successful, or a negative error code on failure.
1566  */
1567 int snd_rawmidi_new(struct snd_card *card, char *id, int device,
1568                     int output_count, int input_count,
1569                     struct snd_rawmidi **rrawmidi)
1570 {
1571         struct snd_rawmidi *rmidi;
1572         int err;
1573         static struct snd_device_ops ops = {
1574                 .dev_free = snd_rawmidi_dev_free,
1575                 .dev_register = snd_rawmidi_dev_register,
1576                 .dev_disconnect = snd_rawmidi_dev_disconnect,
1577         };
1578
1579         if (snd_BUG_ON(!card))
1580                 return -ENXIO;
1581         if (rrawmidi)
1582                 *rrawmidi = NULL;
1583         rmidi = kzalloc(sizeof(*rmidi), GFP_KERNEL);
1584         if (!rmidi)
1585                 return -ENOMEM;
1586         rmidi->card = card;
1587         rmidi->device = device;
1588         mutex_init(&rmidi->open_mutex);
1589         init_waitqueue_head(&rmidi->open_wait);
1590         INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams);
1591         INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams);
1592
1593         if (id != NULL)
1594                 strlcpy(rmidi->id, id, sizeof(rmidi->id));
1595
1596         snd_device_initialize(&rmidi->dev, card);
1597         rmidi->dev.release = release_rawmidi_device;
1598         dev_set_name(&rmidi->dev, "midiC%iD%i", card->number, device);
1599
1600         err = snd_rawmidi_alloc_substreams(rmidi,
1601                                            &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT],
1602                                            SNDRV_RAWMIDI_STREAM_INPUT,
1603                                            input_count);
1604         if (err < 0)
1605                 goto error;
1606         err = snd_rawmidi_alloc_substreams(rmidi,
1607                                            &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT],
1608                                            SNDRV_RAWMIDI_STREAM_OUTPUT,
1609                                            output_count);
1610         if (err < 0)
1611                 goto error;
1612         err = snd_device_new(card, SNDRV_DEV_RAWMIDI, rmidi, &ops);
1613         if (err < 0)
1614                 goto error;
1615
1616         if (rrawmidi)
1617                 *rrawmidi = rmidi;
1618         return 0;
1619
1620  error:
1621         snd_rawmidi_free(rmidi);
1622         return err;
1623 }
1624 EXPORT_SYMBOL(snd_rawmidi_new);
1625
1626 static void snd_rawmidi_free_substreams(struct snd_rawmidi_str *stream)
1627 {
1628         struct snd_rawmidi_substream *substream;
1629
1630         while (!list_empty(&stream->substreams)) {
1631                 substream = list_entry(stream->substreams.next, struct snd_rawmidi_substream, list);
1632                 list_del(&substream->list);
1633                 kfree(substream);
1634         }
1635 }
1636
1637 static int snd_rawmidi_free(struct snd_rawmidi *rmidi)
1638 {
1639         if (!rmidi)
1640                 return 0;
1641
1642         snd_info_free_entry(rmidi->proc_entry);
1643         rmidi->proc_entry = NULL;
1644         mutex_lock(&register_mutex);
1645         if (rmidi->ops && rmidi->ops->dev_unregister)
1646                 rmidi->ops->dev_unregister(rmidi);
1647         mutex_unlock(&register_mutex);
1648
1649         snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT]);
1650         snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT]);
1651         if (rmidi->private_free)
1652                 rmidi->private_free(rmidi);
1653         put_device(&rmidi->dev);
1654         return 0;
1655 }
1656
1657 static int snd_rawmidi_dev_free(struct snd_device *device)
1658 {
1659         struct snd_rawmidi *rmidi = device->device_data;
1660
1661         return snd_rawmidi_free(rmidi);
1662 }
1663
1664 #if IS_ENABLED(CONFIG_SND_SEQUENCER)
1665 static void snd_rawmidi_dev_seq_free(struct snd_seq_device *device)
1666 {
1667         struct snd_rawmidi *rmidi = device->private_data;
1668
1669         rmidi->seq_dev = NULL;
1670 }
1671 #endif
1672
1673 static int snd_rawmidi_dev_register(struct snd_device *device)
1674 {
1675         int err;
1676         struct snd_info_entry *entry;
1677         char name[16];
1678         struct snd_rawmidi *rmidi = device->device_data;
1679
1680         if (rmidi->device >= SNDRV_RAWMIDI_DEVICES)
1681                 return -ENOMEM;
1682         err = 0;
1683         mutex_lock(&register_mutex);
1684         if (snd_rawmidi_search(rmidi->card, rmidi->device))
1685                 err = -EBUSY;
1686         else
1687                 list_add_tail(&rmidi->list, &snd_rawmidi_devices);
1688         mutex_unlock(&register_mutex);
1689         if (err < 0)
1690                 return err;
1691
1692         err = snd_register_device(SNDRV_DEVICE_TYPE_RAWMIDI,
1693                                   rmidi->card, rmidi->device,
1694                                   &snd_rawmidi_f_ops, rmidi, &rmidi->dev);
1695         if (err < 0) {
1696                 rmidi_err(rmidi, "unable to register\n");
1697                 goto error;
1698         }
1699         if (rmidi->ops && rmidi->ops->dev_register) {
1700                 err = rmidi->ops->dev_register(rmidi);
1701                 if (err < 0)
1702                         goto error_unregister;
1703         }
1704 #ifdef CONFIG_SND_OSSEMUL
1705         rmidi->ossreg = 0;
1706         if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1707                 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1708                                             rmidi->card, 0, &snd_rawmidi_f_ops,
1709                                             rmidi) < 0) {
1710                         rmidi_err(rmidi,
1711                                   "unable to register OSS rawmidi device %i:%i\n",
1712                                   rmidi->card->number, 0);
1713                 } else {
1714                         rmidi->ossreg++;
1715 #ifdef SNDRV_OSS_INFO_DEV_MIDI
1716                         snd_oss_info_register(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number, rmidi->name);
1717 #endif
1718                 }
1719         }
1720         if ((int)rmidi->device == amidi_map[rmidi->card->number]) {
1721                 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1722                                             rmidi->card, 1, &snd_rawmidi_f_ops,
1723                                             rmidi) < 0) {
1724                         rmidi_err(rmidi,
1725                                   "unable to register OSS rawmidi device %i:%i\n",
1726                                   rmidi->card->number, 1);
1727                 } else {
1728                         rmidi->ossreg++;
1729                 }
1730         }
1731 #endif /* CONFIG_SND_OSSEMUL */
1732         sprintf(name, "midi%d", rmidi->device);
1733         entry = snd_info_create_card_entry(rmidi->card, name, rmidi->card->proc_root);
1734         if (entry) {
1735                 entry->private_data = rmidi;
1736                 entry->c.text.read = snd_rawmidi_proc_info_read;
1737                 if (snd_info_register(entry) < 0) {
1738                         snd_info_free_entry(entry);
1739                         entry = NULL;
1740                 }
1741         }
1742         rmidi->proc_entry = entry;
1743 #if IS_ENABLED(CONFIG_SND_SEQUENCER)
1744         if (!rmidi->ops || !rmidi->ops->dev_register) { /* own registration mechanism */
1745                 if (snd_seq_device_new(rmidi->card, rmidi->device, SNDRV_SEQ_DEV_ID_MIDISYNTH, 0, &rmidi->seq_dev) >= 0) {
1746                         rmidi->seq_dev->private_data = rmidi;
1747                         rmidi->seq_dev->private_free = snd_rawmidi_dev_seq_free;
1748                         sprintf(rmidi->seq_dev->name, "MIDI %d-%d", rmidi->card->number, rmidi->device);
1749                         snd_device_register(rmidi->card, rmidi->seq_dev);
1750                 }
1751         }
1752 #endif
1753         return 0;
1754
1755  error_unregister:
1756         snd_unregister_device(&rmidi->dev);
1757  error:
1758         mutex_lock(&register_mutex);
1759         list_del(&rmidi->list);
1760         mutex_unlock(&register_mutex);
1761         return err;
1762 }
1763
1764 static int snd_rawmidi_dev_disconnect(struct snd_device *device)
1765 {
1766         struct snd_rawmidi *rmidi = device->device_data;
1767         int dir;
1768
1769         mutex_lock(&register_mutex);
1770         mutex_lock(&rmidi->open_mutex);
1771         wake_up(&rmidi->open_wait);
1772         list_del_init(&rmidi->list);
1773         for (dir = 0; dir < 2; dir++) {
1774                 struct snd_rawmidi_substream *s;
1775
1776                 list_for_each_entry(s, &rmidi->streams[dir].substreams, list) {
1777                         if (s->runtime)
1778                                 wake_up(&s->runtime->sleep);
1779                 }
1780         }
1781
1782 #ifdef CONFIG_SND_OSSEMUL
1783         if (rmidi->ossreg) {
1784                 if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1785                         snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 0);
1786 #ifdef SNDRV_OSS_INFO_DEV_MIDI
1787                         snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number);
1788 #endif
1789                 }
1790                 if ((int)rmidi->device == amidi_map[rmidi->card->number])
1791                         snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 1);
1792                 rmidi->ossreg = 0;
1793         }
1794 #endif /* CONFIG_SND_OSSEMUL */
1795         snd_unregister_device(&rmidi->dev);
1796         mutex_unlock(&rmidi->open_mutex);
1797         mutex_unlock(&register_mutex);
1798         return 0;
1799 }
1800
1801 /**
1802  * snd_rawmidi_set_ops - set the rawmidi operators
1803  * @rmidi: the rawmidi instance
1804  * @stream: the stream direction, SNDRV_RAWMIDI_STREAM_XXX
1805  * @ops: the operator table
1806  *
1807  * Sets the rawmidi operators for the given stream direction.
1808  */
1809 void snd_rawmidi_set_ops(struct snd_rawmidi *rmidi, int stream,
1810                          const struct snd_rawmidi_ops *ops)
1811 {
1812         struct snd_rawmidi_substream *substream;
1813
1814         list_for_each_entry(substream, &rmidi->streams[stream].substreams, list)
1815                 substream->ops = ops;
1816 }
1817 EXPORT_SYMBOL(snd_rawmidi_set_ops);
1818
1819 /*
1820  *  ENTRY functions
1821  */
1822
1823 static int __init alsa_rawmidi_init(void)
1824 {
1825
1826         snd_ctl_register_ioctl(snd_rawmidi_control_ioctl);
1827         snd_ctl_register_ioctl_compat(snd_rawmidi_control_ioctl);
1828 #ifdef CONFIG_SND_OSSEMUL
1829         { int i;
1830         /* check device map table */
1831         for (i = 0; i < SNDRV_CARDS; i++) {
1832                 if (midi_map[i] < 0 || midi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1833                         pr_err("ALSA: rawmidi: invalid midi_map[%d] = %d\n",
1834                                i, midi_map[i]);
1835                         midi_map[i] = 0;
1836                 }
1837                 if (amidi_map[i] < 0 || amidi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1838                         pr_err("ALSA: rawmidi: invalid amidi_map[%d] = %d\n",
1839                                i, amidi_map[i]);
1840                         amidi_map[i] = 1;
1841                 }
1842         }
1843         }
1844 #endif /* CONFIG_SND_OSSEMUL */
1845         return 0;
1846 }
1847
1848 static void __exit alsa_rawmidi_exit(void)
1849 {
1850         snd_ctl_unregister_ioctl(snd_rawmidi_control_ioctl);
1851         snd_ctl_unregister_ioctl_compat(snd_rawmidi_control_ioctl);
1852 }
1853
1854 module_init(alsa_rawmidi_init)
1855 module_exit(alsa_rawmidi_exit)