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 struct snd_rawmidi_status32 {
  54         s32 stream;
  55         s32 tstamp_sec;                 /* Timestamp */
  56         s32 tstamp_nsec;
  57         u32 avail;                      /* available bytes */
  58         u32 xruns;                      /* count of overruns since last status (in bytes) */
  59         unsigned char reserved[16];     /* reserved for future use */
  60 };
  61
  62 #define SNDRV_RAWMIDI_IOCTL_STATUS32    _IOWR('W', 0x20, struct snd_rawmidi_status32)
  63
  64 struct snd_rawmidi_status64 {
  65         int stream;
  66         u8 rsvd[4];                     /* alignment */
  67         s64 tstamp_sec;                 /* Timestamp */
  68         s64 tstamp_nsec;
  69         size_t avail;                   /* available bytes */
  70         size_t xruns;                   /* count of overruns since last status (in bytes) */
  71         unsigned char reserved[16];     /* reserved for future use */
  72 };
  73
  74 #define SNDRV_RAWMIDI_IOCTL_STATUS64    _IOWR('W', 0x20, struct snd_rawmidi_status64)
  75
  76 static struct snd_rawmidi *snd_rawmidi_search(struct snd_card *card, int device)
  77 {
  78         struct snd_rawmidi *rawmidi;
  79
  80         list_for_each_entry(rawmidi, &snd_rawmidi_devices, list)
  81                 if (rawmidi->card == card && rawmidi->device == device)
  82                         return rawmidi;
  83         return NULL;
  84 }
  85
  86 static inline unsigned short snd_rawmidi_file_flags(struct file *file)
  87 {
  88         switch (file->f_mode & (FMODE_READ | FMODE_WRITE)) {
  89         case FMODE_WRITE:
  90                 return SNDRV_RAWMIDI_LFLG_OUTPUT;
  91         case FMODE_READ:
  92                 return SNDRV_RAWMIDI_LFLG_INPUT;
  93         default:
  94                 return SNDRV_RAWMIDI_LFLG_OPEN;
  95         }
  96 }
  97
  98 static inline int snd_rawmidi_ready(struct snd_rawmidi_substream *substream)
  99 {
 100         struct snd_rawmidi_runtime *runtime = substream->runtime;
 101
 102         return runtime->avail >= runtime->avail_min;
 103 }
 104
 105 static inline int snd_rawmidi_ready_append(struct snd_rawmidi_substream *substream,
 106                                            size_t count)
 107 {
 108         struct snd_rawmidi_runtime *runtime = substream->runtime;
 109
 110         return runtime->avail >= runtime->avail_min &&
 111                (!substream->append || runtime->avail >= count);
 112 }
 113
 114 static void snd_rawmidi_input_event_work(struct work_struct *work)
 115 {
 116         struct snd_rawmidi_runtime *runtime =
 117                 container_of(work, struct snd_rawmidi_runtime, event_work);
 118
 119         if (runtime->event)
 120                 runtime->event(runtime->substream);
 121 }
 122
 123 static int snd_rawmidi_runtime_create(struct snd_rawmidi_substream *substream)
 124 {
 125         struct snd_rawmidi_runtime *runtime;
 126
 127         runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
 128         if (!runtime)
 129                 return -ENOMEM;
 130         runtime->substream = substream;
 131         spin_lock_init(&runtime->lock);
 132         init_waitqueue_head(&runtime->sleep);
 133         INIT_WORK(&runtime->event_work, snd_rawmidi_input_event_work);
 134         runtime->event = NULL;
 135         runtime->buffer_size = PAGE_SIZE;
 136         runtime->avail_min = 1;
 137         if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
 138                 runtime->avail = 0;
 139         else
 140                 runtime->avail = runtime->buffer_size;
 141         runtime->buffer = kvzalloc(runtime->buffer_size, GFP_KERNEL);
 142         if (!runtime->buffer) {
 143                 kfree(runtime);
 144                 return -ENOMEM;
 145         }
 146         runtime->appl_ptr = runtime->hw_ptr = 0;
 147         substream->runtime = runtime;
 148         return 0;
 149 }
 150
 151 static int snd_rawmidi_runtime_free(struct snd_rawmidi_substream *substream)
 152 {
 153         struct snd_rawmidi_runtime *runtime = substream->runtime;
 154
 155         kvfree(runtime->buffer);
 156         kfree(runtime);
 157         substream->runtime = NULL;
 158         return 0;
 159 }
 160
 161 static inline void snd_rawmidi_output_trigger(struct snd_rawmidi_substream *substream, int up)
 162 {
 163         if (!substream->opened)
 164                 return;
 165         substream->ops->trigger(substream, up);
 166 }
 167
 168 static void snd_rawmidi_input_trigger(struct snd_rawmidi_substream *substream, int up)
 169 {
 170         if (!substream->opened)
 171                 return;
 172         substream->ops->trigger(substream, up);
 173         if (!up)
 174                 cancel_work_sync(&substream->runtime->event_work);
 175 }
 176
 177 static void __reset_runtime_ptrs(struct snd_rawmidi_runtime *runtime,
 178                                  bool is_input)
 179 {
 180         runtime->drain = 0;
 181         runtime->appl_ptr = runtime->hw_ptr = 0;
 182         runtime->avail = is_input ? 0 : runtime->buffer_size;
 183 }
 184
 185 static void reset_runtime_ptrs(struct snd_rawmidi_runtime *runtime,
 186                                bool is_input)
 187 {
 188         unsigned long flags;
 189
 190         spin_lock_irqsave(&runtime->lock, flags);
 191         __reset_runtime_ptrs(runtime, is_input);
 192         spin_unlock_irqrestore(&runtime->lock, flags);
 193 }
 194
 195 int snd_rawmidi_drop_output(struct snd_rawmidi_substream *substream)
 196 {
 197         snd_rawmidi_output_trigger(substream, 0);
 198         reset_runtime_ptrs(substream->runtime, false);
 199         return 0;
 200 }
 201 EXPORT_SYMBOL(snd_rawmidi_drop_output);
 202
 203 int snd_rawmidi_drain_output(struct snd_rawmidi_substream *substream)
 204 {
 205         int err;
 206         long timeout;
 207         struct snd_rawmidi_runtime *runtime = substream->runtime;
 208
 209         err = 0;
 210         runtime->drain = 1;
 211         timeout = wait_event_interruptible_timeout(runtime->sleep,
 212                                 (runtime->avail >= runtime->buffer_size),
 213                                 10*HZ);
 214         if (signal_pending(current))
 215                 err = -ERESTARTSYS;
 216         if (runtime->avail < runtime->buffer_size && !timeout) {
 217                 rmidi_warn(substream->rmidi,
 218                            "rawmidi drain error (avail = %li, buffer_size = %li)\n",
 219                            (long)runtime->avail, (long)runtime->buffer_size);
 220                 err = -EIO;
 221         }
 222         runtime->drain = 0;
 223         if (err != -ERESTARTSYS) {
 224                 /* we need wait a while to make sure that Tx FIFOs are empty */
 225                 if (substream->ops->drain)
 226                         substream->ops->drain(substream);
 227                 else
 228                         msleep(50);
 229                 snd_rawmidi_drop_output(substream);
 230         }
 231         return err;
 232 }
 233 EXPORT_SYMBOL(snd_rawmidi_drain_output);
 234
 235 int snd_rawmidi_drain_input(struct snd_rawmidi_substream *substream)
 236 {
 237         snd_rawmidi_input_trigger(substream, 0);
 238         reset_runtime_ptrs(substream->runtime, true);
 239         return 0;
 240 }
 241 EXPORT_SYMBOL(snd_rawmidi_drain_input);
 242
 243 /* look for an available substream for the given stream direction;
 244  * if a specific subdevice is given, try to assign it
 245  */
 246 static int assign_substream(struct snd_rawmidi *rmidi, int subdevice,
 247                             int stream, int mode,
 248                             struct snd_rawmidi_substream **sub_ret)
 249 {
 250         struct snd_rawmidi_substream *substream;
 251         struct snd_rawmidi_str *s = &rmidi->streams[stream];
 252         static const unsigned int info_flags[2] = {
 253                 [SNDRV_RAWMIDI_STREAM_OUTPUT] = SNDRV_RAWMIDI_INFO_OUTPUT,
 254                 [SNDRV_RAWMIDI_STREAM_INPUT] = SNDRV_RAWMIDI_INFO_INPUT,
 255         };
 256
 257         if (!(rmidi->info_flags & info_flags[stream]))
 258                 return -ENXIO;
 259         if (subdevice >= 0 && subdevice >= s->substream_count)
 260                 return -ENODEV;
 261
 262         list_for_each_entry(substream, &s->substreams, list) {
 263                 if (substream->opened) {
 264                         if (stream == SNDRV_RAWMIDI_STREAM_INPUT ||
 265                             !(mode & SNDRV_RAWMIDI_LFLG_APPEND) ||
 266                             !substream->append)
 267                                 continue;
 268                 }
 269                 if (subdevice < 0 || subdevice == substream->number) {
 270                         *sub_ret = substream;
 271                         return 0;
 272                 }
 273         }
 274         return -EAGAIN;
 275 }
 276
 277 /* open and do ref-counting for the given substream */
 278 static int open_substream(struct snd_rawmidi *rmidi,
 279                           struct snd_rawmidi_substream *substream,
 280                           int mode)
 281 {
 282         int err;
 283
 284         if (substream->use_count == 0) {
 285                 err = snd_rawmidi_runtime_create(substream);
 286                 if (err < 0)
 287                         return err;
 288                 err = substream->ops->open(substream);
 289                 if (err < 0) {
 290                         snd_rawmidi_runtime_free(substream);
 291                         return err;
 292                 }
 293                 substream->opened = 1;
 294                 substream->active_sensing = 0;
 295                 if (mode & SNDRV_RAWMIDI_LFLG_APPEND)
 296                         substream->append = 1;
 297                 substream->pid = get_pid(task_pid(current));
 298                 rmidi->streams[substream->stream].substream_opened++;
 299         }
 300         substream->use_count++;
 301         return 0;
 302 }
 303
 304 static void close_substream(struct snd_rawmidi *rmidi,
 305                             struct snd_rawmidi_substream *substream,
 306                             int cleanup);
 307
 308 static int rawmidi_open_priv(struct snd_rawmidi *rmidi, int subdevice, int mode,
 309                              struct snd_rawmidi_file *rfile)
 310 {
 311         struct snd_rawmidi_substream *sinput = NULL, *soutput = NULL;
 312         int err;
 313
 314         rfile->input = rfile->output = NULL;
 315         if (mode & SNDRV_RAWMIDI_LFLG_INPUT) {
 316                 err = assign_substream(rmidi, subdevice,
 317                                        SNDRV_RAWMIDI_STREAM_INPUT,
 318                                        mode, &sinput);
 319                 if (err < 0)
 320                         return err;
 321         }
 322         if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) {
 323                 err = assign_substream(rmidi, subdevice,
 324                                        SNDRV_RAWMIDI_STREAM_OUTPUT,
 325                                        mode, &soutput);
 326                 if (err < 0)
 327                         return err;
 328         }
 329
 330         if (sinput) {
 331                 err = open_substream(rmidi, sinput, mode);
 332                 if (err < 0)
 333                         return err;
 334         }
 335         if (soutput) {
 336                 err = open_substream(rmidi, soutput, mode);
 337                 if (err < 0) {
 338                         if (sinput)
 339                                 close_substream(rmidi, sinput, 0);
 340                         return err;
 341                 }
 342         }
 343
 344         rfile->rmidi = rmidi;
 345         rfile->input = sinput;
 346         rfile->output = soutput;
 347         return 0;
 348 }
 349
 350 /* called from sound/core/seq/seq_midi.c */
 351 int snd_rawmidi_kernel_open(struct snd_card *card, int device, int subdevice,
 352                             int mode, struct snd_rawmidi_file *rfile)
 353 {
 354         struct snd_rawmidi *rmidi;
 355         int err = 0;
 356
 357         if (snd_BUG_ON(!rfile))
 358                 return -EINVAL;
 359
 360         mutex_lock(&register_mutex);
 361         rmidi = snd_rawmidi_search(card, device);
 362         if (!rmidi)
 363                 err = -ENODEV;
 364         else if (!try_module_get(rmidi->card->module))
 365                 err = -ENXIO;
 366         mutex_unlock(&register_mutex);
 367         if (err < 0)
 368                 return err;
 369
 370         mutex_lock(&rmidi->open_mutex);
 371         err = rawmidi_open_priv(rmidi, subdevice, mode, rfile);
 372         mutex_unlock(&rmidi->open_mutex);
 373         if (err < 0)
 374                 module_put(rmidi->card->module);
 375         return err;
 376 }
 377 EXPORT_SYMBOL(snd_rawmidi_kernel_open);
 378
 379 static int snd_rawmidi_open(struct inode *inode, struct file *file)
 380 {
 381         int maj = imajor(inode);
 382         struct snd_card *card;
 383         int subdevice;
 384         unsigned short fflags;
 385         int err;
 386         struct snd_rawmidi *rmidi;
 387         struct snd_rawmidi_file *rawmidi_file = NULL;
 388         wait_queue_entry_t wait;
 389
 390         if ((file->f_flags & O_APPEND) && !(file->f_flags & O_NONBLOCK))
 391                 return -EINVAL;         /* invalid combination */
 392
 393         err = stream_open(inode, file);
 394         if (err < 0)
 395                 return err;
 396
 397         if (maj == snd_major) {
 398                 rmidi = snd_lookup_minor_data(iminor(inode),
 399                                               SNDRV_DEVICE_TYPE_RAWMIDI);
 400 #ifdef CONFIG_SND_OSSEMUL
 401         } else if (maj == SOUND_MAJOR) {
 402                 rmidi = snd_lookup_oss_minor_data(iminor(inode),
 403                                                   SNDRV_OSS_DEVICE_TYPE_MIDI);
 404 #endif
 405         } else
 406                 return -ENXIO;
 407
 408         if (rmidi == NULL)
 409                 return -ENODEV;
 410
 411         if (!try_module_get(rmidi->card->module)) {
 412                 snd_card_unref(rmidi->card);
 413                 return -ENXIO;
 414         }
 415
 416         mutex_lock(&rmidi->open_mutex);
 417         card = rmidi->card;
 418         err = snd_card_file_add(card, file);
 419         if (err < 0)
 420                 goto __error_card;
 421         fflags = snd_rawmidi_file_flags(file);
 422         if ((file->f_flags & O_APPEND) || maj == SOUND_MAJOR) /* OSS emul? */
 423                 fflags |= SNDRV_RAWMIDI_LFLG_APPEND;
 424         rawmidi_file = kmalloc(sizeof(*rawmidi_file), GFP_KERNEL);
 425         if (rawmidi_file == NULL) {
 426                 err = -ENOMEM;
 427                 goto __error;
 428         }
 429         init_waitqueue_entry(&wait, current);
 430         add_wait_queue(&rmidi->open_wait, &wait);
 431         while (1) {
 432                 subdevice = snd_ctl_get_preferred_subdevice(card, SND_CTL_SUBDEV_RAWMIDI);
 433                 err = rawmidi_open_priv(rmidi, subdevice, fflags, rawmidi_file);
 434                 if (err >= 0)
 435                         break;
 436                 if (err == -EAGAIN) {
 437                         if (file->f_flags & O_NONBLOCK) {
 438                                 err = -EBUSY;
 439                                 break;
 440                         }
 441                 } else
 442                         break;
 443                 set_current_state(TASK_INTERRUPTIBLE);
 444                 mutex_unlock(&rmidi->open_mutex);
 445                 schedule();
 446                 mutex_lock(&rmidi->open_mutex);
 447                 if (rmidi->card->shutdown) {
 448                         err = -ENODEV;
 449                         break;
 450                 }
 451                 if (signal_pending(current)) {
 452                         err = -ERESTARTSYS;
 453                         break;
 454                 }
 455         }
 456         remove_wait_queue(&rmidi->open_wait, &wait);
 457         if (err < 0) {
 458                 kfree(rawmidi_file);
 459                 goto __error;
 460         }
 461 #ifdef CONFIG_SND_OSSEMUL
 462         if (rawmidi_file->input && rawmidi_file->input->runtime)
 463                 rawmidi_file->input->runtime->oss = (maj == SOUND_MAJOR);
 464         if (rawmidi_file->output && rawmidi_file->output->runtime)
 465                 rawmidi_file->output->runtime->oss = (maj == SOUND_MAJOR);
 466 #endif
 467         file->private_data = rawmidi_file;
 468         mutex_unlock(&rmidi->open_mutex);
 469         snd_card_unref(rmidi->card);
 470         return 0;
 471
 472  __error:
 473         snd_card_file_remove(card, file);
 474  __error_card:
 475         mutex_unlock(&rmidi->open_mutex);
 476         module_put(rmidi->card->module);
 477         snd_card_unref(rmidi->card);
 478         return err;
 479 }
 480
 481 static void close_substream(struct snd_rawmidi *rmidi,
 482                             struct snd_rawmidi_substream *substream,
 483                             int cleanup)
 484 {
 485         if (--substream->use_count)
 486                 return;
 487
 488         if (cleanup) {
 489                 if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
 490                         snd_rawmidi_input_trigger(substream, 0);
 491                 else {
 492                         if (substream->active_sensing) {
 493                                 unsigned char buf = 0xfe;
 494                                 /* sending single active sensing message
 495                                  * to shut the device up
 496                                  */
 497                                 snd_rawmidi_kernel_write(substream, &buf, 1);
 498                         }
 499                         if (snd_rawmidi_drain_output(substream) == -ERESTARTSYS)
 500                                 snd_rawmidi_output_trigger(substream, 0);
 501                 }
 502         }
 503         substream->ops->close(substream);
 504         if (substream->runtime->private_free)
 505                 substream->runtime->private_free(substream);
 506         snd_rawmidi_runtime_free(substream);
 507         substream->opened = 0;
 508         substream->append = 0;
 509         put_pid(substream->pid);
 510         substream->pid = NULL;
 511         rmidi->streams[substream->stream].substream_opened--;
 512 }
 513
 514 static void rawmidi_release_priv(struct snd_rawmidi_file *rfile)
 515 {
 516         struct snd_rawmidi *rmidi;
 517
 518         rmidi = rfile->rmidi;
 519         mutex_lock(&rmidi->open_mutex);
 520         if (rfile->input) {
 521                 close_substream(rmidi, rfile->input, 1);
 522                 rfile->input = NULL;
 523         }
 524         if (rfile->output) {
 525                 close_substream(rmidi, rfile->output, 1);
 526                 rfile->output = NULL;
 527         }
 528         rfile->rmidi = NULL;
 529         mutex_unlock(&rmidi->open_mutex);
 530         wake_up(&rmidi->open_wait);
 531 }
 532
 533 /* called from sound/core/seq/seq_midi.c */
 534 int snd_rawmidi_kernel_release(struct snd_rawmidi_file *rfile)
 535 {
 536         struct snd_rawmidi *rmidi;
 537
 538         if (snd_BUG_ON(!rfile))
 539                 return -ENXIO;
 540
 541         rmidi = rfile->rmidi;
 542         rawmidi_release_priv(rfile);
 543         module_put(rmidi->card->module);
 544         return 0;
 545 }
 546 EXPORT_SYMBOL(snd_rawmidi_kernel_release);
 547
 548 static int snd_rawmidi_release(struct inode *inode, struct file *file)
 549 {
 550         struct snd_rawmidi_file *rfile;
 551         struct snd_rawmidi *rmidi;
 552         struct module *module;
 553
 554         rfile = file->private_data;
 555         rmidi = rfile->rmidi;
 556         rawmidi_release_priv(rfile);
 557         kfree(rfile);
 558         module = rmidi->card->module;
 559         snd_card_file_remove(rmidi->card, file);
 560         module_put(module);
 561         return 0;
 562 }
 563
 564 static int snd_rawmidi_info(struct snd_rawmidi_substream *substream,
 565                             struct snd_rawmidi_info *info)
 566 {
 567         struct snd_rawmidi *rmidi;
 568
 569         if (substream == NULL)
 570                 return -ENODEV;
 571         rmidi = substream->rmidi;
 572         memset(info, 0, sizeof(*info));
 573         info->card = rmidi->card->number;
 574         info->device = rmidi->device;
 575         info->subdevice = substream->number;
 576         info->stream = substream->stream;
 577         info->flags = rmidi->info_flags;
 578         strcpy(info->id, rmidi->id);
 579         strcpy(info->name, rmidi->name);
 580         strcpy(info->subname, substream->name);
 581         info->subdevices_count = substream->pstr->substream_count;
 582         info->subdevices_avail = (substream->pstr->substream_count -
 583                                   substream->pstr->substream_opened);
 584         return 0;
 585 }
 586
 587 static int snd_rawmidi_info_user(struct snd_rawmidi_substream *substream,
 588                                  struct snd_rawmidi_info __user *_info)
 589 {
 590         struct snd_rawmidi_info info;
 591         int err;
 592
 593         err = snd_rawmidi_info(substream, &info);
 594         if (err < 0)
 595                 return err;
 596         if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
 597                 return -EFAULT;
 598         return 0;
 599 }
 600
 601 static int __snd_rawmidi_info_select(struct snd_card *card,
 602                                      struct snd_rawmidi_info *info)
 603 {
 604         struct snd_rawmidi *rmidi;
 605         struct snd_rawmidi_str *pstr;
 606         struct snd_rawmidi_substream *substream;
 607
 608         rmidi = snd_rawmidi_search(card, info->device);
 609         if (!rmidi)
 610                 return -ENXIO;
 611         if (info->stream < 0 || info->stream > 1)
 612                 return -EINVAL;
 613         info->stream = array_index_nospec(info->stream, 2);
 614         pstr = &rmidi->streams[info->stream];
 615         if (pstr->substream_count == 0)
 616                 return -ENOENT;
 617         if (info->subdevice >= pstr->substream_count)
 618                 return -ENXIO;
 619         list_for_each_entry(substream, &pstr->substreams, list) {
 620                 if ((unsigned int)substream->number == info->subdevice)
 621                         return snd_rawmidi_info(substream, info);
 622         }
 623         return -ENXIO;
 624 }
 625
 626 int snd_rawmidi_info_select(struct snd_card *card, struct snd_rawmidi_info *info)
 627 {
 628         int ret;
 629
 630         mutex_lock(&register_mutex);
 631         ret = __snd_rawmidi_info_select(card, info);
 632         mutex_unlock(&register_mutex);
 633         return ret;
 634 }
 635 EXPORT_SYMBOL(snd_rawmidi_info_select);
 636
 637 static int snd_rawmidi_info_select_user(struct snd_card *card,
 638                                         struct snd_rawmidi_info __user *_info)
 639 {
 640         int err;
 641         struct snd_rawmidi_info info;
 642
 643         if (get_user(info.device, &_info->device))
 644                 return -EFAULT;
 645         if (get_user(info.stream, &_info->stream))
 646                 return -EFAULT;
 647         if (get_user(info.subdevice, &_info->subdevice))
 648                 return -EFAULT;
 649         err = snd_rawmidi_info_select(card, &info);
 650         if (err < 0)
 651                 return err;
 652         if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
 653                 return -EFAULT;
 654         return 0;
 655 }
 656
 657 static int resize_runtime_buffer(struct snd_rawmidi_runtime *runtime,
 658                                  struct snd_rawmidi_params *params,
 659                                  bool is_input)
 660 {
 661         char *newbuf, *oldbuf;
 662
 663         if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L)
 664                 return -EINVAL;
 665         if (params->avail_min < 1 || params->avail_min > params->buffer_size)
 666                 return -EINVAL;
 667         if (params->buffer_size != runtime->buffer_size) {
 668                 newbuf = kvzalloc(params->buffer_size, GFP_KERNEL);
 669                 if (!newbuf)
 670                         return -ENOMEM;
 671                 spin_lock_irq(&runtime->lock);
 672                 oldbuf = runtime->buffer;
 673                 runtime->buffer = newbuf;
 674                 runtime->buffer_size = params->buffer_size;
 675                 __reset_runtime_ptrs(runtime, is_input);
 676                 spin_unlock_irq(&runtime->lock);
 677                 kvfree(oldbuf);
 678         }
 679         runtime->avail_min = params->avail_min;
 680         return 0;
 681 }
 682
 683 int snd_rawmidi_output_params(struct snd_rawmidi_substream *substream,
 684                               struct snd_rawmidi_params *params)
 685 {
 686         if (substream->append && substream->use_count > 1)
 687                 return -EBUSY;
 688         snd_rawmidi_drain_output(substream);
 689         substream->active_sensing = !params->no_active_sensing;
 690         return resize_runtime_buffer(substream->runtime, params, false);
 691 }
 692 EXPORT_SYMBOL(snd_rawmidi_output_params);
 693
 694 int snd_rawmidi_input_params(struct snd_rawmidi_substream *substream,
 695                              struct snd_rawmidi_params *params)
 696 {
 697         snd_rawmidi_drain_input(substream);
 698         return resize_runtime_buffer(substream->runtime, params, true);
 699 }
 700 EXPORT_SYMBOL(snd_rawmidi_input_params);
 701
 702 static int snd_rawmidi_output_status(struct snd_rawmidi_substream *substream,
 703                                      struct snd_rawmidi_status64 *status)
 704 {
 705         struct snd_rawmidi_runtime *runtime = substream->runtime;
 706
 707         memset(status, 0, sizeof(*status));
 708         status->stream = SNDRV_RAWMIDI_STREAM_OUTPUT;
 709         spin_lock_irq(&runtime->lock);
 710         status->avail = runtime->avail;
 711         spin_unlock_irq(&runtime->lock);
 712         return 0;
 713 }
 714
 715 static int snd_rawmidi_input_status(struct snd_rawmidi_substream *substream,
 716                                     struct snd_rawmidi_status64 *status)
 717 {
 718         struct snd_rawmidi_runtime *runtime = substream->runtime;
 719
 720         memset(status, 0, sizeof(*status));
 721         status->stream = SNDRV_RAWMIDI_STREAM_INPUT;
 722         spin_lock_irq(&runtime->lock);
 723         status->avail = runtime->avail;
 724         status->xruns = runtime->xruns;
 725         runtime->xruns = 0;
 726         spin_unlock_irq(&runtime->lock);
 727         return 0;
 728 }
 729
 730 static int snd_rawmidi_ioctl_status32(struct snd_rawmidi_file *rfile,
 731                                       struct snd_rawmidi_status32 __user *argp)
 732 {
 733         int err = 0;
 734         struct snd_rawmidi_status32 __user *status = argp;
 735         struct snd_rawmidi_status32 status32;
 736         struct snd_rawmidi_status64 status64;
 737
 738         if (copy_from_user(&status32, argp,
 739                            sizeof(struct snd_rawmidi_status32)))
 740                 return -EFAULT;
 741
 742         switch (status32.stream) {
 743         case SNDRV_RAWMIDI_STREAM_OUTPUT:
 744                 if (rfile->output == NULL)
 745                         return -EINVAL;
 746                 err = snd_rawmidi_output_status(rfile->output, &status64);
 747                 break;
 748         case SNDRV_RAWMIDI_STREAM_INPUT:
 749                 if (rfile->input == NULL)
 750                         return -EINVAL;
 751                 err = snd_rawmidi_input_status(rfile->input, &status64);
 752                 break;
 753         default:
 754                 return -EINVAL;
 755         }
 756         if (err < 0)
 757                 return err;
 758
 759         status32 = (struct snd_rawmidi_status32) {
 760                 .stream = status64.stream,
 761                 .tstamp_sec = status64.tstamp_sec,
 762                 .tstamp_nsec = status64.tstamp_nsec,
 763                 .avail = status64.avail,
 764                 .xruns = status64.xruns,
 765         };
 766
 767         if (copy_to_user(status, &status32, sizeof(*status)))
 768                 return -EFAULT;
 769
 770         return 0;
 771 }
 772
 773 static int snd_rawmidi_ioctl_status64(struct snd_rawmidi_file *rfile,
 774                                       struct snd_rawmidi_status64 __user *argp)
 775 {
 776         int err = 0;
 777         struct snd_rawmidi_status64 status;
 778
 779         if (copy_from_user(&status, argp, sizeof(struct snd_rawmidi_status64)))
 780                 return -EFAULT;
 781
 782         switch (status.stream) {
 783         case SNDRV_RAWMIDI_STREAM_OUTPUT:
 784                 if (rfile->output == NULL)
 785                         return -EINVAL;
 786                 err = snd_rawmidi_output_status(rfile->output, &status);
 787                 break;
 788         case SNDRV_RAWMIDI_STREAM_INPUT:
 789                 if (rfile->input == NULL)
 790                         return -EINVAL;
 791                 err = snd_rawmidi_input_status(rfile->input, &status);
 792                 break;
 793         default:
 794                 return -EINVAL;
 795         }
 796         if (err < 0)
 797                 return err;
 798         if (copy_to_user(argp, &status,
 799                          sizeof(struct snd_rawmidi_status64)))
 800                 return -EFAULT;
 801         return 0;
 802 }
 803
 804 static long snd_rawmidi_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 805 {
 806         struct snd_rawmidi_file *rfile;
 807         void __user *argp = (void __user *)arg;
 808
 809         rfile = file->private_data;
 810         if (((cmd >> 8) & 0xff) != 'W')
 811                 return -ENOTTY;
 812         switch (cmd) {
 813         case SNDRV_RAWMIDI_IOCTL_PVERSION:
 814                 return put_user(SNDRV_RAWMIDI_VERSION, (int __user *)argp) ? -EFAULT : 0;
 815         case SNDRV_RAWMIDI_IOCTL_INFO:
 816         {
 817                 int stream;
 818                 struct snd_rawmidi_info __user *info = argp;
 819
 820                 if (get_user(stream, &info->stream))
 821                         return -EFAULT;
 822                 switch (stream) {
 823                 case SNDRV_RAWMIDI_STREAM_INPUT:
 824                         return snd_rawmidi_info_user(rfile->input, info);
 825                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
 826                         return snd_rawmidi_info_user(rfile->output, info);
 827                 default:
 828                         return -EINVAL;
 829                 }
 830         }
 831         case SNDRV_RAWMIDI_IOCTL_PARAMS:
 832         {
 833                 struct snd_rawmidi_params params;
 834
 835                 if (copy_from_user(&params, argp, sizeof(struct snd_rawmidi_params)))
 836                         return -EFAULT;
 837                 switch (params.stream) {
 838                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
 839                         if (rfile->output == NULL)
 840                                 return -EINVAL;
 841                         return snd_rawmidi_output_params(rfile->output, &params);
 842                 case SNDRV_RAWMIDI_STREAM_INPUT:
 843                         if (rfile->input == NULL)
 844                                 return -EINVAL;
 845                         return snd_rawmidi_input_params(rfile->input, &params);
 846                 default:
 847                         return -EINVAL;
 848                 }
 849         }
 850         case SNDRV_RAWMIDI_IOCTL_STATUS32:
 851                 return snd_rawmidi_ioctl_status32(rfile, argp);
 852         case SNDRV_RAWMIDI_IOCTL_STATUS64:
 853                 return snd_rawmidi_ioctl_status64(rfile, argp);
 854         case SNDRV_RAWMIDI_IOCTL_DROP:
 855         {
 856                 int val;
 857
 858                 if (get_user(val, (int __user *) argp))
 859                         return -EFAULT;
 860                 switch (val) {
 861                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
 862                         if (rfile->output == NULL)
 863                                 return -EINVAL;
 864                         return snd_rawmidi_drop_output(rfile->output);
 865                 default:
 866                         return -EINVAL;
 867                 }
 868         }
 869         case SNDRV_RAWMIDI_IOCTL_DRAIN:
 870         {
 871                 int val;
 872
 873                 if (get_user(val, (int __user *) argp))
 874                         return -EFAULT;
 875                 switch (val) {
 876                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
 877                         if (rfile->output == NULL)
 878                                 return -EINVAL;
 879                         return snd_rawmidi_drain_output(rfile->output);
 880                 case SNDRV_RAWMIDI_STREAM_INPUT:
 881                         if (rfile->input == NULL)
 882                                 return -EINVAL;
 883                         return snd_rawmidi_drain_input(rfile->input);
 884                 default:
 885                         return -EINVAL;
 886                 }
 887         }
 888         default:
 889                 rmidi_dbg(rfile->rmidi,
 890                           "rawmidi: unknown command = 0x%x\n", cmd);
 891         }
 892         return -ENOTTY;
 893 }
 894
 895 static int snd_rawmidi_control_ioctl(struct snd_card *card,
 896                                      struct snd_ctl_file *control,
 897                                      unsigned int cmd,
 898                                      unsigned long arg)
 899 {
 900         void __user *argp = (void __user *)arg;
 901
 902         switch (cmd) {
 903         case SNDRV_CTL_IOCTL_RAWMIDI_NEXT_DEVICE:
 904         {
 905                 int device;
 906
 907                 if (get_user(device, (int __user *)argp))
 908                         return -EFAULT;
 909                 if (device >= SNDRV_RAWMIDI_DEVICES) /* next device is -1 */
 910                         device = SNDRV_RAWMIDI_DEVICES - 1;
 911                 mutex_lock(&register_mutex);
 912                 device = device < 0 ? 0 : device + 1;
 913                 while (device < SNDRV_RAWMIDI_DEVICES) {
 914                         if (snd_rawmidi_search(card, device))
 915                                 break;
 916                         device++;
 917                 }
 918                 if (device == SNDRV_RAWMIDI_DEVICES)
 919                         device = -1;
 920                 mutex_unlock(&register_mutex);
 921                 if (put_user(device, (int __user *)argp))
 922                         return -EFAULT;
 923                 return 0;
 924         }
 925         case SNDRV_CTL_IOCTL_RAWMIDI_PREFER_SUBDEVICE:
 926         {
 927                 int val;
 928
 929                 if (get_user(val, (int __user *)argp))
 930                         return -EFAULT;
 931                 control->preferred_subdevice[SND_CTL_SUBDEV_RAWMIDI] = val;
 932                 return 0;
 933         }
 934         case SNDRV_CTL_IOCTL_RAWMIDI_INFO:
 935                 return snd_rawmidi_info_select_user(card, argp);
 936         }
 937         return -ENOIOCTLCMD;
 938 }
 939
 940 /**
 941  * snd_rawmidi_receive - receive the input data from the device
 942  * @substream: the rawmidi substream
 943  * @buffer: the buffer pointer
 944  * @count: the data size to read
 945  *
 946  * Reads the data from the internal buffer.
 947  *
 948  * Return: The size of read data, or a negative error code on failure.
 949  */
 950 int snd_rawmidi_receive(struct snd_rawmidi_substream *substream,
 951                         const unsigned char *buffer, int count)
 952 {
 953         unsigned long flags;
 954         int result = 0, count1;
 955         struct snd_rawmidi_runtime *runtime = substream->runtime;
 956
 957         if (!substream->opened)
 958                 return -EBADFD;
 959         if (runtime->buffer == NULL) {
 960                 rmidi_dbg(substream->rmidi,
 961                           "snd_rawmidi_receive: input is not active!!!\n");
 962                 return -EINVAL;
 963         }
 964         spin_lock_irqsave(&runtime->lock, flags);
 965         if (count == 1) {       /* special case, faster code */
 966                 substream->bytes++;
 967                 if (runtime->avail < runtime->buffer_size) {
 968                         runtime->buffer[runtime->hw_ptr++] = buffer[0];
 969                         runtime->hw_ptr %= runtime->buffer_size;
 970                         runtime->avail++;
 971                         result++;
 972                 } else {
 973                         runtime->xruns++;
 974                 }
 975         } else {
 976                 substream->bytes += count;
 977                 count1 = runtime->buffer_size - runtime->hw_ptr;
 978                 if (count1 > count)
 979                         count1 = count;
 980                 if (count1 > (int)(runtime->buffer_size - runtime->avail))
 981                         count1 = runtime->buffer_size - runtime->avail;
 982                 memcpy(runtime->buffer + runtime->hw_ptr, buffer, count1);
 983                 runtime->hw_ptr += count1;
 984                 runtime->hw_ptr %= runtime->buffer_size;
 985                 runtime->avail += count1;
 986                 count -= count1;
 987                 result += count1;
 988                 if (count > 0) {
 989                         buffer += count1;
 990                         count1 = count;
 991                         if (count1 > (int)(runtime->buffer_size - runtime->avail)) {
 992                                 count1 = runtime->buffer_size - runtime->avail;
 993                                 runtime->xruns += count - count1;
 994                         }
 995                         if (count1 > 0) {
 996                                 memcpy(runtime->buffer, buffer, count1);
 997                                 runtime->hw_ptr = count1;
 998                                 runtime->avail += count1;
 999                                 result += count1;
1000                         }
1001                 }
1002         }
1003         if (result > 0) {
1004                 if (runtime->event)
1005                         schedule_work(&runtime->event_work);
1006                 else if (snd_rawmidi_ready(substream))
1007                         wake_up(&runtime->sleep);
1008         }
1009         spin_unlock_irqrestore(&runtime->lock, flags);
1010         return result;
1011 }
1012 EXPORT_SYMBOL(snd_rawmidi_receive);
1013
1014 static long snd_rawmidi_kernel_read1(struct snd_rawmidi_substream *substream,
1015                                      unsigned char __user *userbuf,
1016                                      unsigned char *kernelbuf, long count)
1017 {
1018         unsigned long flags;
1019         long result = 0, count1;
1020         struct snd_rawmidi_runtime *runtime = substream->runtime;
1021         unsigned long appl_ptr;
1022
1023         spin_lock_irqsave(&runtime->lock, flags);
1024         while (count > 0 && runtime->avail) {
1025                 count1 = runtime->buffer_size - runtime->appl_ptr;
1026                 if (count1 > count)
1027                         count1 = count;
1028                 if (count1 > (int)runtime->avail)
1029                         count1 = runtime->avail;
1030
1031                 /* update runtime->appl_ptr before unlocking for userbuf */
1032                 appl_ptr = runtime->appl_ptr;
1033                 runtime->appl_ptr += count1;
1034                 runtime->appl_ptr %= runtime->buffer_size;
1035                 runtime->avail -= count1;
1036
1037                 if (kernelbuf)
1038                         memcpy(kernelbuf + result, runtime->buffer + appl_ptr, count1);
1039                 if (userbuf) {
1040                         spin_unlock_irqrestore(&runtime->lock, flags);
1041                         if (copy_to_user(userbuf + result,
1042                                          runtime->buffer + appl_ptr, count1)) {
1043                                 return result > 0 ? result : -EFAULT;
1044                         }
1045                         spin_lock_irqsave(&runtime->lock, flags);
1046                 }
1047                 result += count1;
1048                 count -= count1;
1049         }
1050         spin_unlock_irqrestore(&runtime->lock, flags);
1051         return result;
1052 }
1053
1054 long snd_rawmidi_kernel_read(struct snd_rawmidi_substream *substream,
1055                              unsigned char *buf, long count)
1056 {
1057         snd_rawmidi_input_trigger(substream, 1);
1058         return snd_rawmidi_kernel_read1(substream, NULL/*userbuf*/, buf, count);
1059 }
1060 EXPORT_SYMBOL(snd_rawmidi_kernel_read);
1061
1062 static ssize_t snd_rawmidi_read(struct file *file, char __user *buf, size_t count,
1063                                 loff_t *offset)
1064 {
1065         long result;
1066         int count1;
1067         struct snd_rawmidi_file *rfile;
1068         struct snd_rawmidi_substream *substream;
1069         struct snd_rawmidi_runtime *runtime;
1070
1071         rfile = file->private_data;
1072         substream = rfile->input;
1073         if (substream == NULL)
1074                 return -EIO;
1075         runtime = substream->runtime;
1076         snd_rawmidi_input_trigger(substream, 1);
1077         result = 0;
1078         while (count > 0) {
1079                 spin_lock_irq(&runtime->lock);
1080                 while (!snd_rawmidi_ready(substream)) {
1081                         wait_queue_entry_t wait;
1082
1083                         if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1084                                 spin_unlock_irq(&runtime->lock);
1085                                 return result > 0 ? result : -EAGAIN;
1086                         }
1087                         init_waitqueue_entry(&wait, current);
1088                         add_wait_queue(&runtime->sleep, &wait);
1089                         set_current_state(TASK_INTERRUPTIBLE);
1090                         spin_unlock_irq(&runtime->lock);
1091                         schedule();
1092                         remove_wait_queue(&runtime->sleep, &wait);
1093                         if (rfile->rmidi->card->shutdown)
1094                                 return -ENODEV;
1095                         if (signal_pending(current))
1096                                 return result > 0 ? result : -ERESTARTSYS;
1097                         if (!runtime->avail)
1098                                 return result > 0 ? result : -EIO;
1099                         spin_lock_irq(&runtime->lock);
1100                 }
1101                 spin_unlock_irq(&runtime->lock);
1102                 count1 = snd_rawmidi_kernel_read1(substream,
1103                                                   (unsigned char __user *)buf,
1104                                                   NULL/*kernelbuf*/,
1105                                                   count);
1106                 if (count1 < 0)
1107                         return result > 0 ? result : count1;
1108                 result += count1;
1109                 buf += count1;
1110                 count -= count1;
1111         }
1112         return result;
1113 }
1114
1115 /**
1116  * snd_rawmidi_transmit_empty - check whether the output buffer is empty
1117  * @substream: the rawmidi substream
1118  *
1119  * Return: 1 if the internal output buffer is empty, 0 if not.
1120  */
1121 int snd_rawmidi_transmit_empty(struct snd_rawmidi_substream *substream)
1122 {
1123         struct snd_rawmidi_runtime *runtime = substream->runtime;
1124         int result;
1125         unsigned long flags;
1126
1127         if (runtime->buffer == NULL) {
1128                 rmidi_dbg(substream->rmidi,
1129                           "snd_rawmidi_transmit_empty: output is not active!!!\n");
1130                 return 1;
1131         }
1132         spin_lock_irqsave(&runtime->lock, flags);
1133         result = runtime->avail >= runtime->buffer_size;
1134         spin_unlock_irqrestore(&runtime->lock, flags);
1135         return result;
1136 }
1137 EXPORT_SYMBOL(snd_rawmidi_transmit_empty);
1138
1139 /**
1140  * __snd_rawmidi_transmit_peek - copy data from the internal buffer
1141  * @substream: the rawmidi substream
1142  * @buffer: the buffer pointer
1143  * @count: data size to transfer
1144  *
1145  * This is a variant of snd_rawmidi_transmit_peek() without spinlock.
1146  */
1147 int __snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
1148                               unsigned char *buffer, int count)
1149 {
1150         int result, count1;
1151         struct snd_rawmidi_runtime *runtime = substream->runtime;
1152
1153         if (runtime->buffer == NULL) {
1154                 rmidi_dbg(substream->rmidi,
1155                           "snd_rawmidi_transmit_peek: output is not active!!!\n");
1156                 return -EINVAL;
1157         }
1158         result = 0;
1159         if (runtime->avail >= runtime->buffer_size) {
1160                 /* warning: lowlevel layer MUST trigger down the hardware */
1161                 goto __skip;
1162         }
1163         if (count == 1) {       /* special case, faster code */
1164                 *buffer = runtime->buffer[runtime->hw_ptr];
1165                 result++;
1166         } else {
1167                 count1 = runtime->buffer_size - runtime->hw_ptr;
1168                 if (count1 > count)
1169                         count1 = count;
1170                 if (count1 > (int)(runtime->buffer_size - runtime->avail))
1171                         count1 = runtime->buffer_size - runtime->avail;
1172                 memcpy(buffer, runtime->buffer + runtime->hw_ptr, count1);
1173                 count -= count1;
1174                 result += count1;
1175                 if (count > 0) {
1176                         if (count > (int)(runtime->buffer_size - runtime->avail - count1))
1177                                 count = runtime->buffer_size - runtime->avail - count1;
1178                         memcpy(buffer + count1, runtime->buffer, count);
1179                         result += count;
1180                 }
1181         }
1182       __skip:
1183         return result;
1184 }
1185 EXPORT_SYMBOL(__snd_rawmidi_transmit_peek);
1186
1187 /**
1188  * snd_rawmidi_transmit_peek - copy data from the internal buffer
1189  * @substream: the rawmidi substream
1190  * @buffer: the buffer pointer
1191  * @count: data size to transfer
1192  *
1193  * Copies data from the internal output buffer to the given buffer.
1194  *
1195  * Call this in the interrupt handler when the midi output is ready,
1196  * and call snd_rawmidi_transmit_ack() after the transmission is
1197  * finished.
1198  *
1199  * Return: The size of copied data, or a negative error code on failure.
1200  */
1201 int snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
1202                               unsigned char *buffer, 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_peek(substream, buffer, count);
1210         spin_unlock_irqrestore(&runtime->lock, flags);
1211         return result;
1212 }
1213 EXPORT_SYMBOL(snd_rawmidi_transmit_peek);
1214
1215 /**
1216  * __snd_rawmidi_transmit_ack - acknowledge the transmission
1217  * @substream: the rawmidi substream
1218  * @count: the transferred count
1219  *
1220  * This is a variant of __snd_rawmidi_transmit_ack() without spinlock.
1221  */
1222 int __snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count)
1223 {
1224         struct snd_rawmidi_runtime *runtime = substream->runtime;
1225
1226         if (runtime->buffer == NULL) {
1227                 rmidi_dbg(substream->rmidi,
1228                           "snd_rawmidi_transmit_ack: output is not active!!!\n");
1229                 return -EINVAL;
1230         }
1231         snd_BUG_ON(runtime->avail + count > runtime->buffer_size);
1232         runtime->hw_ptr += count;
1233         runtime->hw_ptr %= runtime->buffer_size;
1234         runtime->avail += count;
1235         substream->bytes += count;
1236         if (count > 0) {
1237                 if (runtime->drain || snd_rawmidi_ready(substream))
1238                         wake_up(&runtime->sleep);
1239         }
1240         return count;
1241 }
1242 EXPORT_SYMBOL(__snd_rawmidi_transmit_ack);
1243
1244 /**
1245  * snd_rawmidi_transmit_ack - acknowledge the transmission
1246  * @substream: the rawmidi substream
1247  * @count: the transferred count
1248  *
1249  * Advances the hardware pointer for the internal output buffer with
1250  * the given size and updates the condition.
1251  * Call after the transmission is finished.
1252  *
1253  * Return: The advanced size if successful, or a negative error code on failure.
1254  */
1255 int snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count)
1256 {
1257         struct snd_rawmidi_runtime *runtime = substream->runtime;
1258         int result;
1259         unsigned long flags;
1260
1261         spin_lock_irqsave(&runtime->lock, flags);
1262         result = __snd_rawmidi_transmit_ack(substream, count);
1263         spin_unlock_irqrestore(&runtime->lock, flags);
1264         return result;
1265 }
1266 EXPORT_SYMBOL(snd_rawmidi_transmit_ack);
1267
1268 /**
1269  * snd_rawmidi_transmit - copy from the buffer to the device
1270  * @substream: the rawmidi substream
1271  * @buffer: the buffer pointer
1272  * @count: the data size to transfer
1273  *
1274  * Copies data from the buffer to the device and advances the pointer.
1275  *
1276  * Return: The copied size if successful, or a negative error code on failure.
1277  */
1278 int snd_rawmidi_transmit(struct snd_rawmidi_substream *substream,
1279                          unsigned char *buffer, int count)
1280 {
1281         struct snd_rawmidi_runtime *runtime = substream->runtime;
1282         int result;
1283         unsigned long flags;
1284
1285         spin_lock_irqsave(&runtime->lock, flags);
1286         if (!substream->opened)
1287                 result = -EBADFD;
1288         else {
1289                 count = __snd_rawmidi_transmit_peek(substream, buffer, count);
1290                 if (count <= 0)
1291                         result = count;
1292                 else
1293                         result = __snd_rawmidi_transmit_ack(substream, count);
1294         }
1295         spin_unlock_irqrestore(&runtime->lock, flags);
1296         return result;
1297 }
1298 EXPORT_SYMBOL(snd_rawmidi_transmit);
1299
1300 /**
1301  * snd_rawmidi_proceed - Discard the all pending bytes and proceed
1302  * @substream: rawmidi substream
1303  *
1304  * Return: the number of discarded bytes
1305  */
1306 int snd_rawmidi_proceed(struct snd_rawmidi_substream *substream)
1307 {
1308         struct snd_rawmidi_runtime *runtime = substream->runtime;
1309         unsigned long flags;
1310         int count = 0;
1311
1312         spin_lock_irqsave(&runtime->lock, flags);
1313         if (runtime->avail < runtime->buffer_size) {
1314                 count = runtime->buffer_size - runtime->avail;
1315                 __snd_rawmidi_transmit_ack(substream, count);
1316         }
1317         spin_unlock_irqrestore(&runtime->lock, flags);
1318         return count;
1319 }
1320 EXPORT_SYMBOL(snd_rawmidi_proceed);
1321
1322 static long snd_rawmidi_kernel_write1(struct snd_rawmidi_substream *substream,
1323                                       const unsigned char __user *userbuf,
1324                                       const unsigned char *kernelbuf,
1325                                       long count)
1326 {
1327         unsigned long flags;
1328         long count1, result;
1329         struct snd_rawmidi_runtime *runtime = substream->runtime;
1330         unsigned long appl_ptr;
1331
1332         if (!kernelbuf && !userbuf)
1333                 return -EINVAL;
1334         if (snd_BUG_ON(!runtime->buffer))
1335                 return -EINVAL;
1336
1337         result = 0;
1338         spin_lock_irqsave(&runtime->lock, flags);
1339         if (substream->append) {
1340                 if ((long)runtime->avail < count) {
1341                         spin_unlock_irqrestore(&runtime->lock, flags);
1342                         return -EAGAIN;
1343                 }
1344         }
1345         while (count > 0 && runtime->avail > 0) {
1346                 count1 = runtime->buffer_size - runtime->appl_ptr;
1347                 if (count1 > count)
1348                         count1 = count;
1349                 if (count1 > (long)runtime->avail)
1350                         count1 = runtime->avail;
1351
1352                 /* update runtime->appl_ptr before unlocking for userbuf */
1353                 appl_ptr = runtime->appl_ptr;
1354                 runtime->appl_ptr += count1;
1355                 runtime->appl_ptr %= runtime->buffer_size;
1356                 runtime->avail -= count1;
1357
1358                 if (kernelbuf)
1359                         memcpy(runtime->buffer + appl_ptr,
1360                                kernelbuf + result, count1);
1361                 else if (userbuf) {
1362                         spin_unlock_irqrestore(&runtime->lock, flags);
1363                         if (copy_from_user(runtime->buffer + appl_ptr,
1364                                            userbuf + result, count1)) {
1365                                 spin_lock_irqsave(&runtime->lock, flags);
1366                                 result = result > 0 ? result : -EFAULT;
1367                                 goto __end;
1368                         }
1369                         spin_lock_irqsave(&runtime->lock, flags);
1370                 }
1371                 result += count1;
1372                 count -= count1;
1373         }
1374       __end:
1375         count1 = runtime->avail < runtime->buffer_size;
1376         spin_unlock_irqrestore(&runtime->lock, flags);
1377         if (count1)
1378                 snd_rawmidi_output_trigger(substream, 1);
1379         return result;
1380 }
1381
1382 long snd_rawmidi_kernel_write(struct snd_rawmidi_substream *substream,
1383                               const unsigned char *buf, long count)
1384 {
1385         return snd_rawmidi_kernel_write1(substream, NULL, buf, count);
1386 }
1387 EXPORT_SYMBOL(snd_rawmidi_kernel_write);
1388
1389 static ssize_t snd_rawmidi_write(struct file *file, const char __user *buf,
1390                                  size_t count, loff_t *offset)
1391 {
1392         long result, timeout;
1393         int count1;
1394         struct snd_rawmidi_file *rfile;
1395         struct snd_rawmidi_runtime *runtime;
1396         struct snd_rawmidi_substream *substream;
1397
1398         rfile = file->private_data;
1399         substream = rfile->output;
1400         runtime = substream->runtime;
1401         /* we cannot put an atomic message to our buffer */
1402         if (substream->append && count > runtime->buffer_size)
1403                 return -EIO;
1404         result = 0;
1405         while (count > 0) {
1406                 spin_lock_irq(&runtime->lock);
1407                 while (!snd_rawmidi_ready_append(substream, count)) {
1408                         wait_queue_entry_t wait;
1409
1410                         if (file->f_flags & O_NONBLOCK) {
1411                                 spin_unlock_irq(&runtime->lock);
1412                                 return result > 0 ? result : -EAGAIN;
1413                         }
1414                         init_waitqueue_entry(&wait, current);
1415                         add_wait_queue(&runtime->sleep, &wait);
1416                         set_current_state(TASK_INTERRUPTIBLE);
1417                         spin_unlock_irq(&runtime->lock);
1418                         timeout = schedule_timeout(30 * HZ);
1419                         remove_wait_queue(&runtime->sleep, &wait);
1420                         if (rfile->rmidi->card->shutdown)
1421                                 return -ENODEV;
1422                         if (signal_pending(current))
1423                                 return result > 0 ? result : -ERESTARTSYS;
1424                         if (!runtime->avail && !timeout)
1425                                 return result > 0 ? result : -EIO;
1426                         spin_lock_irq(&runtime->lock);
1427                 }
1428                 spin_unlock_irq(&runtime->lock);
1429                 count1 = snd_rawmidi_kernel_write1(substream, buf, NULL, count);
1430                 if (count1 < 0)
1431                         return result > 0 ? result : count1;
1432                 result += count1;
1433                 buf += count1;
1434                 if ((size_t)count1 < count && (file->f_flags & O_NONBLOCK))
1435                         break;
1436                 count -= count1;
1437         }
1438         if (file->f_flags & O_DSYNC) {
1439                 spin_lock_irq(&runtime->lock);
1440                 while (runtime->avail != runtime->buffer_size) {
1441                         wait_queue_entry_t wait;
1442                         unsigned int last_avail = runtime->avail;
1443
1444                         init_waitqueue_entry(&wait, current);
1445                         add_wait_queue(&runtime->sleep, &wait);
1446                         set_current_state(TASK_INTERRUPTIBLE);
1447                         spin_unlock_irq(&runtime->lock);
1448                         timeout = schedule_timeout(30 * HZ);
1449                         remove_wait_queue(&runtime->sleep, &wait);
1450                         if (signal_pending(current))
1451                                 return result > 0 ? result : -ERESTARTSYS;
1452                         if (runtime->avail == last_avail && !timeout)
1453                                 return result > 0 ? result : -EIO;
1454                         spin_lock_irq(&runtime->lock);
1455                 }
1456                 spin_unlock_irq(&runtime->lock);
1457         }
1458         return result;
1459 }
1460
1461 static __poll_t snd_rawmidi_poll(struct file *file, poll_table *wait)
1462 {
1463         struct snd_rawmidi_file *rfile;
1464         struct snd_rawmidi_runtime *runtime;
1465         __poll_t mask;
1466
1467         rfile = file->private_data;
1468         if (rfile->input != NULL) {
1469                 runtime = rfile->input->runtime;
1470                 snd_rawmidi_input_trigger(rfile->input, 1);
1471                 poll_wait(file, &runtime->sleep, wait);
1472         }
1473         if (rfile->output != NULL) {
1474                 runtime = rfile->output->runtime;
1475                 poll_wait(file, &runtime->sleep, wait);
1476         }
1477         mask = 0;
1478         if (rfile->input != NULL) {
1479                 if (snd_rawmidi_ready(rfile->input))
1480                         mask |= EPOLLIN | EPOLLRDNORM;
1481         }
1482         if (rfile->output != NULL) {
1483                 if (snd_rawmidi_ready(rfile->output))
1484                         mask |= EPOLLOUT | EPOLLWRNORM;
1485         }
1486         return mask;
1487 }
1488
1489 /*
1490  */
1491 #ifdef CONFIG_COMPAT
1492 #include "rawmidi_compat.c"
1493 #else
1494 #define snd_rawmidi_ioctl_compat        NULL
1495 #endif
1496
1497 /*
1498  */
1499
1500 static void snd_rawmidi_proc_info_read(struct snd_info_entry *entry,
1501                                        struct snd_info_buffer *buffer)
1502 {
1503         struct snd_rawmidi *rmidi;
1504         struct snd_rawmidi_substream *substream;
1505         struct snd_rawmidi_runtime *runtime;
1506
1507         rmidi = entry->private_data;
1508         snd_iprintf(buffer, "%s\n\n", rmidi->name);
1509         mutex_lock(&rmidi->open_mutex);
1510         if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_OUTPUT) {
1511                 list_for_each_entry(substream,
1512                                     &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams,
1513                                     list) {
1514                         snd_iprintf(buffer,
1515                                     "Output %d\n"
1516                                     "  Tx bytes     : %lu\n",
1517                                     substream->number,
1518                                     (unsigned long) substream->bytes);
1519                         if (substream->opened) {
1520                                 snd_iprintf(buffer,
1521                                     "  Owner PID    : %d\n",
1522                                     pid_vnr(substream->pid));
1523                                 runtime = substream->runtime;
1524                                 snd_iprintf(buffer,
1525                                     "  Mode         : %s\n"
1526                                     "  Buffer size  : %lu\n"
1527                                     "  Avail        : %lu\n",
1528                                     runtime->oss ? "OSS compatible" : "native",
1529                                     (unsigned long) runtime->buffer_size,
1530                                     (unsigned long) runtime->avail);
1531                         }
1532                 }
1533         }
1534         if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_INPUT) {
1535                 list_for_each_entry(substream,
1536                                     &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams,
1537                                     list) {
1538                         snd_iprintf(buffer,
1539                                     "Input %d\n"
1540                                     "  Rx bytes     : %lu\n",
1541                                     substream->number,
1542                                     (unsigned long) substream->bytes);
1543                         if (substream->opened) {
1544                                 snd_iprintf(buffer,
1545                                             "  Owner PID    : %d\n",
1546                                             pid_vnr(substream->pid));
1547                                 runtime = substream->runtime;
1548                                 snd_iprintf(buffer,
1549                                             "  Buffer size  : %lu\n"
1550                                             "  Avail        : %lu\n"
1551                                             "  Overruns     : %lu\n",
1552                                             (unsigned long) runtime->buffer_size,
1553                                             (unsigned long) runtime->avail,
1554                                             (unsigned long) runtime->xruns);
1555                         }
1556                 }
1557         }
1558         mutex_unlock(&rmidi->open_mutex);
1559 }
1560
1561 /*
1562  *  Register functions
1563  */
1564
1565 static const struct file_operations snd_rawmidi_f_ops = {
1566         .owner =        THIS_MODULE,
1567         .read =         snd_rawmidi_read,
1568         .write =        snd_rawmidi_write,
1569         .open =         snd_rawmidi_open,
1570         .release =      snd_rawmidi_release,
1571         .llseek =       no_llseek,
1572         .poll =         snd_rawmidi_poll,
1573         .unlocked_ioctl =       snd_rawmidi_ioctl,
1574         .compat_ioctl = snd_rawmidi_ioctl_compat,
1575 };
1576
1577 static int snd_rawmidi_alloc_substreams(struct snd_rawmidi *rmidi,
1578                                         struct snd_rawmidi_str *stream,
1579                                         int direction,
1580                                         int count)
1581 {
1582         struct snd_rawmidi_substream *substream;
1583         int idx;
1584
1585         for (idx = 0; idx < count; idx++) {
1586                 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
1587                 if (!substream)
1588                         return -ENOMEM;
1589                 substream->stream = direction;
1590                 substream->number = idx;
1591                 substream->rmidi = rmidi;
1592                 substream->pstr = stream;
1593                 list_add_tail(&substream->list, &stream->substreams);
1594                 stream->substream_count++;
1595         }
1596         return 0;
1597 }
1598
1599 static void release_rawmidi_device(struct device *dev)
1600 {
1601         kfree(container_of(dev, struct snd_rawmidi, dev));
1602 }
1603
1604 /**
1605  * snd_rawmidi_new - create a rawmidi instance
1606  * @card: the card instance
1607  * @id: the id string
1608  * @device: the device index
1609  * @output_count: the number of output streams
1610  * @input_count: the number of input streams
1611  * @rrawmidi: the pointer to store the new rawmidi instance
1612  *
1613  * Creates a new rawmidi instance.
1614  * Use snd_rawmidi_set_ops() to set the operators to the new instance.
1615  *
1616  * Return: Zero if successful, or a negative error code on failure.
1617  */
1618 int snd_rawmidi_new(struct snd_card *card, char *id, int device,
1619                     int output_count, int input_count,
1620                     struct snd_rawmidi **rrawmidi)
1621 {
1622         struct snd_rawmidi *rmidi;
1623         int err;
1624         static const struct snd_device_ops ops = {
1625                 .dev_free = snd_rawmidi_dev_free,
1626                 .dev_register = snd_rawmidi_dev_register,
1627                 .dev_disconnect = snd_rawmidi_dev_disconnect,
1628         };
1629
1630         if (snd_BUG_ON(!card))
1631                 return -ENXIO;
1632         if (rrawmidi)
1633                 *rrawmidi = NULL;
1634         rmidi = kzalloc(sizeof(*rmidi), GFP_KERNEL);
1635         if (!rmidi)
1636                 return -ENOMEM;
1637         rmidi->card = card;
1638         rmidi->device = device;
1639         mutex_init(&rmidi->open_mutex);
1640         init_waitqueue_head(&rmidi->open_wait);
1641         INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams);
1642         INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams);
1643
1644         if (id != NULL)
1645                 strlcpy(rmidi->id, id, sizeof(rmidi->id));
1646
1647         snd_device_initialize(&rmidi->dev, card);
1648         rmidi->dev.release = release_rawmidi_device;
1649         dev_set_name(&rmidi->dev, "midiC%iD%i", card->number, device);
1650
1651         err = snd_rawmidi_alloc_substreams(rmidi,
1652                                            &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT],
1653                                            SNDRV_RAWMIDI_STREAM_INPUT,
1654                                            input_count);
1655         if (err < 0)
1656                 goto error;
1657         err = snd_rawmidi_alloc_substreams(rmidi,
1658                                            &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT],
1659                                            SNDRV_RAWMIDI_STREAM_OUTPUT,
1660                                            output_count);
1661         if (err < 0)
1662                 goto error;
1663         err = snd_device_new(card, SNDRV_DEV_RAWMIDI, rmidi, &ops);
1664         if (err < 0)
1665                 goto error;
1666
1667         if (rrawmidi)
1668                 *rrawmidi = rmidi;
1669         return 0;
1670
1671  error:
1672         snd_rawmidi_free(rmidi);
1673         return err;
1674 }
1675 EXPORT_SYMBOL(snd_rawmidi_new);
1676
1677 static void snd_rawmidi_free_substreams(struct snd_rawmidi_str *stream)
1678 {
1679         struct snd_rawmidi_substream *substream;
1680
1681         while (!list_empty(&stream->substreams)) {
1682                 substream = list_entry(stream->substreams.next, struct snd_rawmidi_substream, list);
1683                 list_del(&substream->list);
1684                 kfree(substream);
1685         }
1686 }
1687
1688 static int snd_rawmidi_free(struct snd_rawmidi *rmidi)
1689 {
1690         if (!rmidi)
1691                 return 0;
1692
1693         snd_info_free_entry(rmidi->proc_entry);
1694         rmidi->proc_entry = NULL;
1695         mutex_lock(&register_mutex);
1696         if (rmidi->ops && rmidi->ops->dev_unregister)
1697                 rmidi->ops->dev_unregister(rmidi);
1698         mutex_unlock(&register_mutex);
1699
1700         snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT]);
1701         snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT]);
1702         if (rmidi->private_free)
1703                 rmidi->private_free(rmidi);
1704         put_device(&rmidi->dev);
1705         return 0;
1706 }
1707
1708 static int snd_rawmidi_dev_free(struct snd_device *device)
1709 {
1710         struct snd_rawmidi *rmidi = device->device_data;
1711
1712         return snd_rawmidi_free(rmidi);
1713 }
1714
1715 #if IS_ENABLED(CONFIG_SND_SEQUENCER)
1716 static void snd_rawmidi_dev_seq_free(struct snd_seq_device *device)
1717 {
1718         struct snd_rawmidi *rmidi = device->private_data;
1719
1720         rmidi->seq_dev = NULL;
1721 }
1722 #endif
1723
1724 static int snd_rawmidi_dev_register(struct snd_device *device)
1725 {
1726         int err;
1727         struct snd_info_entry *entry;
1728         char name[16];
1729         struct snd_rawmidi *rmidi = device->device_data;
1730
1731         if (rmidi->device >= SNDRV_RAWMIDI_DEVICES)
1732                 return -ENOMEM;
1733         err = 0;
1734         mutex_lock(&register_mutex);
1735         if (snd_rawmidi_search(rmidi->card, rmidi->device))
1736                 err = -EBUSY;
1737         else
1738                 list_add_tail(&rmidi->list, &snd_rawmidi_devices);
1739         mutex_unlock(&register_mutex);
1740         if (err < 0)
1741                 return err;
1742
1743         err = snd_register_device(SNDRV_DEVICE_TYPE_RAWMIDI,
1744                                   rmidi->card, rmidi->device,
1745                                   &snd_rawmidi_f_ops, rmidi, &rmidi->dev);
1746         if (err < 0) {
1747                 rmidi_err(rmidi, "unable to register\n");
1748                 goto error;
1749         }
1750         if (rmidi->ops && rmidi->ops->dev_register) {
1751                 err = rmidi->ops->dev_register(rmidi);
1752                 if (err < 0)
1753                         goto error_unregister;
1754         }
1755 #ifdef CONFIG_SND_OSSEMUL
1756         rmidi->ossreg = 0;
1757         if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1758                 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1759                                             rmidi->card, 0, &snd_rawmidi_f_ops,
1760                                             rmidi) < 0) {
1761                         rmidi_err(rmidi,
1762                                   "unable to register OSS rawmidi device %i:%i\n",
1763                                   rmidi->card->number, 0);
1764                 } else {
1765                         rmidi->ossreg++;
1766 #ifdef SNDRV_OSS_INFO_DEV_MIDI
1767                         snd_oss_info_register(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number, rmidi->name);
1768 #endif
1769                 }
1770         }
1771         if ((int)rmidi->device == amidi_map[rmidi->card->number]) {
1772                 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1773                                             rmidi->card, 1, &snd_rawmidi_f_ops,
1774                                             rmidi) < 0) {
1775                         rmidi_err(rmidi,
1776                                   "unable to register OSS rawmidi device %i:%i\n",
1777                                   rmidi->card->number, 1);
1778                 } else {
1779                         rmidi->ossreg++;
1780                 }
1781         }
1782 #endif /* CONFIG_SND_OSSEMUL */
1783         sprintf(name, "midi%d", rmidi->device);
1784         entry = snd_info_create_card_entry(rmidi->card, name, rmidi->card->proc_root);
1785         if (entry) {
1786                 entry->private_data = rmidi;
1787                 entry->c.text.read = snd_rawmidi_proc_info_read;
1788                 if (snd_info_register(entry) < 0) {
1789                         snd_info_free_entry(entry);
1790                         entry = NULL;
1791                 }
1792         }
1793         rmidi->proc_entry = entry;
1794 #if IS_ENABLED(CONFIG_SND_SEQUENCER)
1795         if (!rmidi->ops || !rmidi->ops->dev_register) { /* own registration mechanism */
1796                 if (snd_seq_device_new(rmidi->card, rmidi->device, SNDRV_SEQ_DEV_ID_MIDISYNTH, 0, &rmidi->seq_dev) >= 0) {
1797                         rmidi->seq_dev->private_data = rmidi;
1798                         rmidi->seq_dev->private_free = snd_rawmidi_dev_seq_free;
1799                         sprintf(rmidi->seq_dev->name, "MIDI %d-%d", rmidi->card->number, rmidi->device);
1800                         snd_device_register(rmidi->card, rmidi->seq_dev);
1801                 }
1802         }
1803 #endif
1804         return 0;
1805
1806  error_unregister:
1807         snd_unregister_device(&rmidi->dev);
1808  error:
1809         mutex_lock(&register_mutex);
1810         list_del(&rmidi->list);
1811         mutex_unlock(&register_mutex);
1812         return err;
1813 }
1814
1815 static int snd_rawmidi_dev_disconnect(struct snd_device *device)
1816 {
1817         struct snd_rawmidi *rmidi = device->device_data;
1818         int dir;
1819
1820         mutex_lock(&register_mutex);
1821         mutex_lock(&rmidi->open_mutex);
1822         wake_up(&rmidi->open_wait);
1823         list_del_init(&rmidi->list);
1824         for (dir = 0; dir < 2; dir++) {
1825                 struct snd_rawmidi_substream *s;
1826
1827                 list_for_each_entry(s, &rmidi->streams[dir].substreams, list) {
1828                         if (s->runtime)
1829                                 wake_up(&s->runtime->sleep);
1830                 }
1831         }
1832
1833 #ifdef CONFIG_SND_OSSEMUL
1834         if (rmidi->ossreg) {
1835                 if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1836                         snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 0);
1837 #ifdef SNDRV_OSS_INFO_DEV_MIDI
1838                         snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number);
1839 #endif
1840                 }
1841                 if ((int)rmidi->device == amidi_map[rmidi->card->number])
1842                         snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 1);
1843                 rmidi->ossreg = 0;
1844         }
1845 #endif /* CONFIG_SND_OSSEMUL */
1846         snd_unregister_device(&rmidi->dev);
1847         mutex_unlock(&rmidi->open_mutex);
1848         mutex_unlock(&register_mutex);
1849         return 0;
1850 }
1851
1852 /**
1853  * snd_rawmidi_set_ops - set the rawmidi operators
1854  * @rmidi: the rawmidi instance
1855  * @stream: the stream direction, SNDRV_RAWMIDI_STREAM_XXX
1856  * @ops: the operator table
1857  *
1858  * Sets the rawmidi operators for the given stream direction.
1859  */
1860 void snd_rawmidi_set_ops(struct snd_rawmidi *rmidi, int stream,
1861                          const struct snd_rawmidi_ops *ops)
1862 {
1863         struct snd_rawmidi_substream *substream;
1864
1865         list_for_each_entry(substream, &rmidi->streams[stream].substreams, list)
1866                 substream->ops = ops;
1867 }
1868 EXPORT_SYMBOL(snd_rawmidi_set_ops);
1869
1870 /*
1871  *  ENTRY functions
1872  */
1873
1874 static int __init alsa_rawmidi_init(void)
1875 {
1876
1877         snd_ctl_register_ioctl(snd_rawmidi_control_ioctl);
1878         snd_ctl_register_ioctl_compat(snd_rawmidi_control_ioctl);
1879 #ifdef CONFIG_SND_OSSEMUL
1880         { int i;
1881         /* check device map table */
1882         for (i = 0; i < SNDRV_CARDS; i++) {
1883                 if (midi_map[i] < 0 || midi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1884                         pr_err("ALSA: rawmidi: invalid midi_map[%d] = %d\n",
1885                                i, midi_map[i]);
1886                         midi_map[i] = 0;
1887                 }
1888                 if (amidi_map[i] < 0 || amidi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1889                         pr_err("ALSA: rawmidi: invalid amidi_map[%d] = %d\n",
1890                                i, amidi_map[i]);
1891                         amidi_map[i] = 1;
1892                 }
1893         }
1894         }
1895 #endif /* CONFIG_SND_OSSEMUL */
1896         return 0;
1897 }
1898
1899 static void __exit alsa_rawmidi_exit(void)
1900 {
1901         snd_ctl_unregister_ioctl(snd_rawmidi_control_ioctl);
1902         snd_ctl_unregister_ioctl_compat(snd_rawmidi_control_ioctl);
1903 }
1904
1905 module_init(alsa_rawmidi_init)
1906 module_exit(alsa_rawmidi_exit)