sound/core/rawmidi.c

   1 /*
   2  *  Abstract layer for MIDI v1.0 stream
   3  *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
   4  *
   5  *
   6  *   This program is free software; you can redistribute it and/or modify
   7  *   it under the terms of the GNU General Public License as published by
   8  *   the Free Software Foundation; either version 2 of the License, or
   9  *   (at your option) any later version.
  10  *
  11  *   This program is distributed in the hope that it will be useful,
  12  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *   GNU General Public License for more details.
  15  *
  16  *   You should have received a copy of the GNU General Public License
  17  *   along with this program; if not, write to the Free Software
  18  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  19  *
  20  */
  21
  22 #include <sound/core.h>
  23 #include <linux/major.h>
  24 #include <linux/init.h>
  25 #include <linux/sched/signal.h>
  26 #include <linux/slab.h>
  27 #include <linux/time.h>
  28 #include <linux/wait.h>
  29 #include <linux/mutex.h>
  30 #include <linux/module.h>
  31 #include <linux/delay.h>
  32 #include <linux/mm.h>
  33 #include <linux/nospec.h>
  34 #include <sound/rawmidi.h>
  35 #include <sound/info.h>
  36 #include <sound/control.h>
  37 #include <sound/minors.h>
  38 #include <sound/initval.h>
  39
  40 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
  41 MODULE_DESCRIPTION("Midlevel RawMidi code for ALSA.");
  42 MODULE_LICENSE("GPL");
  43
  44 #ifdef CONFIG_SND_OSSEMUL
  45 static int midi_map[SNDRV_CARDS];
  46 static int amidi_map[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS-1)] = 1};
  47 module_param_array(midi_map, int, NULL, 0444);
  48 MODULE_PARM_DESC(midi_map, "Raw MIDI device number assigned to 1st OSS device.");
  49 module_param_array(amidi_map, int, NULL, 0444);
  50 MODULE_PARM_DESC(amidi_map, "Raw MIDI device number assigned to 2nd OSS device.");
  51 #endif /* CONFIG_SND_OSSEMUL */
  52
  53 static int snd_rawmidi_free(struct snd_rawmidi *rawmidi);
  54 static int snd_rawmidi_dev_free(struct snd_device *device);
  55 static int snd_rawmidi_dev_register(struct snd_device *device);
  56 static int snd_rawmidi_dev_disconnect(struct snd_device *device);
  57
  58 static LIST_HEAD(snd_rawmidi_devices);
  59 static DEFINE_MUTEX(register_mutex);
  60
  61 #define rmidi_err(rmidi, fmt, args...) \
  62         dev_err(&(rmidi)->dev, fmt, ##args)
  63 #define rmidi_warn(rmidi, fmt, args...) \
  64         dev_warn(&(rmidi)->dev, fmt, ##args)
  65 #define rmidi_dbg(rmidi, fmt, args...) \
  66         dev_dbg(&(rmidi)->dev, fmt, ##args)
  67
  68 static struct snd_rawmidi *snd_rawmidi_search(struct snd_card *card, int device)
  69 {
  70         struct snd_rawmidi *rawmidi;
  71
  72         list_for_each_entry(rawmidi, &snd_rawmidi_devices, list)
  73                 if (rawmidi->card == card && rawmidi->device == device)
  74                         return rawmidi;
  75         return NULL;
  76 }
  77
  78 static inline unsigned short snd_rawmidi_file_flags(struct file *file)
  79 {
  80         switch (file->f_mode & (FMODE_READ | FMODE_WRITE)) {
  81         case FMODE_WRITE:
  82                 return SNDRV_RAWMIDI_LFLG_OUTPUT;
  83         case FMODE_READ:
  84                 return SNDRV_RAWMIDI_LFLG_INPUT;
  85         default:
  86                 return SNDRV_RAWMIDI_LFLG_OPEN;
  87         }
  88 }
  89
  90 static inline bool __snd_rawmidi_ready(struct snd_rawmidi_runtime *runtime)
  91 {
  92         return runtime->avail >= runtime->avail_min;
  93 }
  94
  95 static bool snd_rawmidi_ready(struct snd_rawmidi_substream *substream)
  96 {
  97         struct snd_rawmidi_runtime *runtime = substream->runtime;
  98         unsigned long flags;
  99         bool ready;
 100
 101         spin_lock_irqsave(&runtime->lock, flags);
 102         ready = __snd_rawmidi_ready(runtime);
 103         spin_unlock_irqrestore(&runtime->lock, flags);
 104         return ready;
 105 }
 106
 107 static inline int snd_rawmidi_ready_append(struct snd_rawmidi_substream *substream,
 108                                            size_t count)
 109 {
 110         struct snd_rawmidi_runtime *runtime = substream->runtime;
 111
 112         return runtime->avail >= runtime->avail_min &&
 113                (!substream->append || runtime->avail >= count);
 114 }
 115
 116 static void snd_rawmidi_input_event_work(struct work_struct *work)
 117 {
 118         struct snd_rawmidi_runtime *runtime =
 119                 container_of(work, struct snd_rawmidi_runtime, event_work);
 120
 121         if (runtime->event)
 122                 runtime->event(runtime->substream);
 123 }
 124
 125 /* buffer refcount management: call with runtime->lock held */
 126 static inline void snd_rawmidi_buffer_ref(struct snd_rawmidi_runtime *runtime)
 127 {
 128         runtime->buffer_ref++;
 129 }
 130
 131 static inline void snd_rawmidi_buffer_unref(struct snd_rawmidi_runtime *runtime)
 132 {
 133         runtime->buffer_ref--;
 134 }
 135
 136 static int snd_rawmidi_runtime_create(struct snd_rawmidi_substream *substream)
 137 {
 138         struct snd_rawmidi_runtime *runtime;
 139
 140         runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
 141         if (!runtime)
 142                 return -ENOMEM;
 143         runtime->substream = substream;
 144         spin_lock_init(&runtime->lock);
 145         init_waitqueue_head(&runtime->sleep);
 146         INIT_WORK(&runtime->event_work, snd_rawmidi_input_event_work);
 147         runtime->event = NULL;
 148         runtime->buffer_size = PAGE_SIZE;
 149         runtime->avail_min = 1;
 150         if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
 151                 runtime->avail = 0;
 152         else
 153                 runtime->avail = runtime->buffer_size;
 154         runtime->buffer = kvzalloc(runtime->buffer_size, GFP_KERNEL);
 155         if (!runtime->buffer) {
 156                 kfree(runtime);
 157                 return -ENOMEM;
 158         }
 159         runtime->appl_ptr = runtime->hw_ptr = 0;
 160         substream->runtime = runtime;
 161         return 0;
 162 }
 163
 164 static int snd_rawmidi_runtime_free(struct snd_rawmidi_substream *substream)
 165 {
 166         struct snd_rawmidi_runtime *runtime = substream->runtime;
 167
 168         kvfree(runtime->buffer);
 169         kfree(runtime);
 170         substream->runtime = NULL;
 171         return 0;
 172 }
 173
 174 static inline void snd_rawmidi_output_trigger(struct snd_rawmidi_substream *substream, int up)
 175 {
 176         if (!substream->opened)
 177                 return;
 178         substream->ops->trigger(substream, up);
 179 }
 180
 181 static void snd_rawmidi_input_trigger(struct snd_rawmidi_substream *substream, int up)
 182 {
 183         if (!substream->opened)
 184                 return;
 185         substream->ops->trigger(substream, up);
 186         if (!up)
 187                 cancel_work_sync(&substream->runtime->event_work);
 188 }
 189
 190 static void __reset_runtime_ptrs(struct snd_rawmidi_runtime *runtime,
 191                                  bool is_input)
 192 {
 193         runtime->drain = 0;
 194         runtime->appl_ptr = runtime->hw_ptr = 0;
 195         runtime->avail = is_input ? 0 : runtime->buffer_size;
 196 }
 197
 198 static void reset_runtime_ptrs(struct snd_rawmidi_runtime *runtime,
 199                                bool is_input)
 200 {
 201         unsigned long flags;
 202
 203         spin_lock_irqsave(&runtime->lock, flags);
 204         __reset_runtime_ptrs(runtime, is_input);
 205         spin_unlock_irqrestore(&runtime->lock, flags);
 206 }
 207
 208 int snd_rawmidi_drop_output(struct snd_rawmidi_substream *substream)
 209 {
 210         snd_rawmidi_output_trigger(substream, 0);
 211         reset_runtime_ptrs(substream->runtime, false);
 212         return 0;
 213 }
 214 EXPORT_SYMBOL(snd_rawmidi_drop_output);
 215
 216 int snd_rawmidi_drain_output(struct snd_rawmidi_substream *substream)
 217 {
 218         int err;
 219         long timeout;
 220         struct snd_rawmidi_runtime *runtime = substream->runtime;
 221
 222         err = 0;
 223         runtime->drain = 1;
 224         timeout = wait_event_interruptible_timeout(runtime->sleep,
 225                                 (runtime->avail >= runtime->buffer_size),
 226                                 10*HZ);
 227         if (signal_pending(current))
 228                 err = -ERESTARTSYS;
 229         if (runtime->avail < runtime->buffer_size && !timeout) {
 230                 rmidi_warn(substream->rmidi,
 231                            "rawmidi drain error (avail = %li, buffer_size = %li)\n",
 232                            (long)runtime->avail, (long)runtime->buffer_size);
 233                 err = -EIO;
 234         }
 235         runtime->drain = 0;
 236         if (err != -ERESTARTSYS) {
 237                 /* we need wait a while to make sure that Tx FIFOs are empty */
 238                 if (substream->ops->drain)
 239                         substream->ops->drain(substream);
 240                 else
 241                         msleep(50);
 242                 snd_rawmidi_drop_output(substream);
 243         }
 244         return err;
 245 }
 246 EXPORT_SYMBOL(snd_rawmidi_drain_output);
 247
 248 int snd_rawmidi_drain_input(struct snd_rawmidi_substream *substream)
 249 {
 250         snd_rawmidi_input_trigger(substream, 0);
 251         reset_runtime_ptrs(substream->runtime, true);
 252         return 0;
 253 }
 254 EXPORT_SYMBOL(snd_rawmidi_drain_input);
 255
 256 /* look for an available substream for the given stream direction;
 257  * if a specific subdevice is given, try to assign it
 258  */
 259 static int assign_substream(struct snd_rawmidi *rmidi, int subdevice,
 260                             int stream, int mode,
 261                             struct snd_rawmidi_substream **sub_ret)
 262 {
 263         struct snd_rawmidi_substream *substream;
 264         struct snd_rawmidi_str *s = &rmidi->streams[stream];
 265         static unsigned int info_flags[2] = {
 266                 [SNDRV_RAWMIDI_STREAM_OUTPUT] = SNDRV_RAWMIDI_INFO_OUTPUT,
 267                 [SNDRV_RAWMIDI_STREAM_INPUT] = SNDRV_RAWMIDI_INFO_INPUT,
 268         };
 269
 270         if (!(rmidi->info_flags & info_flags[stream]))
 271                 return -ENXIO;
 272         if (subdevice >= 0 && subdevice >= s->substream_count)
 273                 return -ENODEV;
 274
 275         list_for_each_entry(substream, &s->substreams, list) {
 276                 if (substream->opened) {
 277                         if (stream == SNDRV_RAWMIDI_STREAM_INPUT ||
 278                             !(mode & SNDRV_RAWMIDI_LFLG_APPEND) ||
 279                             !substream->append)
 280                                 continue;
 281                 }
 282                 if (subdevice < 0 || subdevice == substream->number) {
 283                         *sub_ret = substream;
 284                         return 0;
 285                 }
 286         }
 287         return -EAGAIN;
 288 }
 289
 290 /* open and do ref-counting for the given substream */
 291 static int open_substream(struct snd_rawmidi *rmidi,
 292                           struct snd_rawmidi_substream *substream,
 293                           int mode)
 294 {
 295         int err;
 296
 297         if (substream->use_count == 0) {
 298                 err = snd_rawmidi_runtime_create(substream);
 299                 if (err < 0)
 300                         return err;
 301                 err = substream->ops->open(substream);
 302                 if (err < 0) {
 303                         snd_rawmidi_runtime_free(substream);
 304                         return err;
 305                 }
 306                 substream->opened = 1;
 307                 substream->active_sensing = 0;
 308                 if (mode & SNDRV_RAWMIDI_LFLG_APPEND)
 309                         substream->append = 1;
 310                 substream->pid = get_pid(task_pid(current));
 311                 rmidi->streams[substream->stream].substream_opened++;
 312         }
 313         substream->use_count++;
 314         return 0;
 315 }
 316
 317 static void close_substream(struct snd_rawmidi *rmidi,
 318                             struct snd_rawmidi_substream *substream,
 319                             int cleanup);
 320
 321 static int rawmidi_open_priv(struct snd_rawmidi *rmidi, int subdevice, int mode,
 322                              struct snd_rawmidi_file *rfile)
 323 {
 324         struct snd_rawmidi_substream *sinput = NULL, *soutput = NULL;
 325         int err;
 326
 327         rfile->input = rfile->output = NULL;
 328         if (mode & SNDRV_RAWMIDI_LFLG_INPUT) {
 329                 err = assign_substream(rmidi, subdevice,
 330                                        SNDRV_RAWMIDI_STREAM_INPUT,
 331                                        mode, &sinput);
 332                 if (err < 0)
 333                         return err;
 334         }
 335         if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) {
 336                 err = assign_substream(rmidi, subdevice,
 337                                        SNDRV_RAWMIDI_STREAM_OUTPUT,
 338                                        mode, &soutput);
 339                 if (err < 0)
 340                         return err;
 341         }
 342
 343         if (sinput) {
 344                 err = open_substream(rmidi, sinput, mode);
 345                 if (err < 0)
 346                         return err;
 347         }
 348         if (soutput) {
 349                 err = open_substream(rmidi, soutput, mode);
 350                 if (err < 0) {
 351                         if (sinput)
 352                                 close_substream(rmidi, sinput, 0);
 353                         return err;
 354                 }
 355         }
 356
 357         rfile->rmidi = rmidi;
 358         rfile->input = sinput;
 359         rfile->output = soutput;
 360         return 0;
 361 }
 362
 363 /* called from sound/core/seq/seq_midi.c */
 364 int snd_rawmidi_kernel_open(struct snd_card *card, int device, int subdevice,
 365                             int mode, struct snd_rawmidi_file *rfile)
 366 {
 367         struct snd_rawmidi *rmidi;
 368         int err = 0;
 369
 370         if (snd_BUG_ON(!rfile))
 371                 return -EINVAL;
 372
 373         mutex_lock(&register_mutex);
 374         rmidi = snd_rawmidi_search(card, device);
 375         if (!rmidi)
 376                 err = -ENODEV;
 377         else if (!try_module_get(rmidi->card->module))
 378                 err = -ENXIO;
 379         mutex_unlock(&register_mutex);
 380         if (err < 0)
 381                 return err;
 382
 383         mutex_lock(&rmidi->open_mutex);
 384         err = rawmidi_open_priv(rmidi, subdevice, mode, rfile);
 385         mutex_unlock(&rmidi->open_mutex);
 386         if (err < 0)
 387                 module_put(rmidi->card->module);
 388         return err;
 389 }
 390 EXPORT_SYMBOL(snd_rawmidi_kernel_open);
 391
 392 static int snd_rawmidi_open(struct inode *inode, struct file *file)
 393 {
 394         int maj = imajor(inode);
 395         struct snd_card *card;
 396         int subdevice;
 397         unsigned short fflags;
 398         int err;
 399         struct snd_rawmidi *rmidi;
 400         struct snd_rawmidi_file *rawmidi_file = NULL;
 401         wait_queue_entry_t wait;
 402
 403         if ((file->f_flags & O_APPEND) && !(file->f_flags & O_NONBLOCK))
 404                 return -EINVAL;         /* invalid combination */
 405
 406         err = nonseekable_open(inode, file);
 407         if (err < 0)
 408                 return err;
 409
 410         if (maj == snd_major) {
 411                 rmidi = snd_lookup_minor_data(iminor(inode),
 412                                               SNDRV_DEVICE_TYPE_RAWMIDI);
 413 #ifdef CONFIG_SND_OSSEMUL
 414         } else if (maj == SOUND_MAJOR) {
 415                 rmidi = snd_lookup_oss_minor_data(iminor(inode),
 416                                                   SNDRV_OSS_DEVICE_TYPE_MIDI);
 417 #endif
 418         } else
 419                 return -ENXIO;
 420
 421         if (rmidi == NULL)
 422                 return -ENODEV;
 423
 424         if (!try_module_get(rmidi->card->module)) {
 425                 snd_card_unref(rmidi->card);
 426                 return -ENXIO;
 427         }
 428
 429         mutex_lock(&rmidi->open_mutex);
 430         card = rmidi->card;
 431         err = snd_card_file_add(card, file);
 432         if (err < 0)
 433                 goto __error_card;
 434         fflags = snd_rawmidi_file_flags(file);
 435         if ((file->f_flags & O_APPEND) || maj == SOUND_MAJOR) /* OSS emul? */
 436                 fflags |= SNDRV_RAWMIDI_LFLG_APPEND;
 437         rawmidi_file = kmalloc(sizeof(*rawmidi_file), GFP_KERNEL);
 438         if (rawmidi_file == NULL) {
 439                 err = -ENOMEM;
 440                 goto __error;
 441         }
 442         init_waitqueue_entry(&wait, current);
 443         add_wait_queue(&rmidi->open_wait, &wait);
 444         while (1) {
 445                 subdevice = snd_ctl_get_preferred_subdevice(card, SND_CTL_SUBDEV_RAWMIDI);
 446                 err = rawmidi_open_priv(rmidi, subdevice, fflags, rawmidi_file);
 447                 if (err >= 0)
 448                         break;
 449                 if (err == -EAGAIN) {
 450                         if (file->f_flags & O_NONBLOCK) {
 451                                 err = -EBUSY;
 452                                 break;
 453                         }
 454                 } else
 455                         break;
 456                 set_current_state(TASK_INTERRUPTIBLE);
 457                 mutex_unlock(&rmidi->open_mutex);
 458                 schedule();
 459                 mutex_lock(&rmidi->open_mutex);
 460                 if (rmidi->card->shutdown) {
 461                         err = -ENODEV;
 462                         break;
 463                 }
 464                 if (signal_pending(current)) {
 465                         err = -ERESTARTSYS;
 466                         break;
 467                 }
 468         }
 469         remove_wait_queue(&rmidi->open_wait, &wait);
 470         if (err < 0) {
 471                 kfree(rawmidi_file);
 472                 goto __error;
 473         }
 474 #ifdef CONFIG_SND_OSSEMUL
 475         if (rawmidi_file->input && rawmidi_file->input->runtime)
 476                 rawmidi_file->input->runtime->oss = (maj == SOUND_MAJOR);
 477         if (rawmidi_file->output && rawmidi_file->output->runtime)
 478                 rawmidi_file->output->runtime->oss = (maj == SOUND_MAJOR);
 479 #endif
 480         file->private_data = rawmidi_file;
 481         mutex_unlock(&rmidi->open_mutex);
 482         snd_card_unref(rmidi->card);
 483         return 0;
 484
 485  __error:
 486         snd_card_file_remove(card, file);
 487  __error_card:
 488         mutex_unlock(&rmidi->open_mutex);
 489         module_put(rmidi->card->module);
 490         snd_card_unref(rmidi->card);
 491         return err;
 492 }
 493
 494 static void close_substream(struct snd_rawmidi *rmidi,
 495                             struct snd_rawmidi_substream *substream,
 496                             int cleanup)
 497 {
 498         if (--substream->use_count)
 499                 return;
 500
 501         if (cleanup) {
 502                 if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
 503                         snd_rawmidi_input_trigger(substream, 0);
 504                 else {
 505                         if (substream->active_sensing) {
 506                                 unsigned char buf = 0xfe;
 507                                 /* sending single active sensing message
 508                                  * to shut the device up
 509                                  */
 510                                 snd_rawmidi_kernel_write(substream, &buf, 1);
 511                         }
 512                         if (snd_rawmidi_drain_output(substream) == -ERESTARTSYS)
 513                                 snd_rawmidi_output_trigger(substream, 0);
 514                 }
 515         }
 516         substream->ops->close(substream);
 517         if (substream->runtime->private_free)
 518                 substream->runtime->private_free(substream);
 519         snd_rawmidi_runtime_free(substream);
 520         substream->opened = 0;
 521         substream->append = 0;
 522         put_pid(substream->pid);
 523         substream->pid = NULL;
 524         rmidi->streams[substream->stream].substream_opened--;
 525 }
 526
 527 static void rawmidi_release_priv(struct snd_rawmidi_file *rfile)
 528 {
 529         struct snd_rawmidi *rmidi;
 530
 531         rmidi = rfile->rmidi;
 532         mutex_lock(&rmidi->open_mutex);
 533         if (rfile->input) {
 534                 close_substream(rmidi, rfile->input, 1);
 535                 rfile->input = NULL;
 536         }
 537         if (rfile->output) {
 538                 close_substream(rmidi, rfile->output, 1);
 539                 rfile->output = NULL;
 540         }
 541         rfile->rmidi = NULL;
 542         mutex_unlock(&rmidi->open_mutex);
 543         wake_up(&rmidi->open_wait);
 544 }
 545
 546 /* called from sound/core/seq/seq_midi.c */
 547 int snd_rawmidi_kernel_release(struct snd_rawmidi_file *rfile)
 548 {
 549         struct snd_rawmidi *rmidi;
 550
 551         if (snd_BUG_ON(!rfile))
 552                 return -ENXIO;
 553
 554         rmidi = rfile->rmidi;
 555         rawmidi_release_priv(rfile);
 556         module_put(rmidi->card->module);
 557         return 0;
 558 }
 559 EXPORT_SYMBOL(snd_rawmidi_kernel_release);
 560
 561 static int snd_rawmidi_release(struct inode *inode, struct file *file)
 562 {
 563         struct snd_rawmidi_file *rfile;
 564         struct snd_rawmidi *rmidi;
 565         struct module *module;
 566
 567         rfile = file->private_data;
 568         rmidi = rfile->rmidi;
 569         rawmidi_release_priv(rfile);
 570         kfree(rfile);
 571         module = rmidi->card->module;
 572         snd_card_file_remove(rmidi->card, file);
 573         module_put(module);
 574         return 0;
 575 }
 576
 577 static int snd_rawmidi_info(struct snd_rawmidi_substream *substream,
 578                             struct snd_rawmidi_info *info)
 579 {
 580         struct snd_rawmidi *rmidi;
 581
 582         if (substream == NULL)
 583                 return -ENODEV;
 584         rmidi = substream->rmidi;
 585         memset(info, 0, sizeof(*info));
 586         info->card = rmidi->card->number;
 587         info->device = rmidi->device;
 588         info->subdevice = substream->number;
 589         info->stream = substream->stream;
 590         info->flags = rmidi->info_flags;
 591         strcpy(info->id, rmidi->id);
 592         strcpy(info->name, rmidi->name);
 593         strcpy(info->subname, substream->name);
 594         info->subdevices_count = substream->pstr->substream_count;
 595         info->subdevices_avail = (substream->pstr->substream_count -
 596                                   substream->pstr->substream_opened);
 597         return 0;
 598 }
 599
 600 static int snd_rawmidi_info_user(struct snd_rawmidi_substream *substream,
 601                                  struct snd_rawmidi_info __user *_info)
 602 {
 603         struct snd_rawmidi_info info;
 604         int err;
 605
 606         err = snd_rawmidi_info(substream, &info);
 607         if (err < 0)
 608                 return err;
 609         if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
 610                 return -EFAULT;
 611         return 0;
 612 }
 613
 614 static int __snd_rawmidi_info_select(struct snd_card *card,
 615                                      struct snd_rawmidi_info *info)
 616 {
 617         struct snd_rawmidi *rmidi;
 618         struct snd_rawmidi_str *pstr;
 619         struct snd_rawmidi_substream *substream;
 620
 621         rmidi = snd_rawmidi_search(card, info->device);
 622         if (!rmidi)
 623                 return -ENXIO;
 624         if (info->stream < 0 || info->stream > 1)
 625                 return -EINVAL;
 626         info->stream = array_index_nospec(info->stream, 2);
 627         pstr = &rmidi->streams[info->stream];
 628         if (pstr->substream_count == 0)
 629                 return -ENOENT;
 630         if (info->subdevice >= pstr->substream_count)
 631                 return -ENXIO;
 632         list_for_each_entry(substream, &pstr->substreams, list) {
 633                 if ((unsigned int)substream->number == info->subdevice)
 634                         return snd_rawmidi_info(substream, info);
 635         }
 636         return -ENXIO;
 637 }
 638
 639 int snd_rawmidi_info_select(struct snd_card *card, struct snd_rawmidi_info *info)
 640 {
 641         int ret;
 642
 643         mutex_lock(&register_mutex);
 644         ret = __snd_rawmidi_info_select(card, info);
 645         mutex_unlock(&register_mutex);
 646         return ret;
 647 }
 648 EXPORT_SYMBOL(snd_rawmidi_info_select);
 649
 650 static int snd_rawmidi_info_select_user(struct snd_card *card,
 651                                         struct snd_rawmidi_info __user *_info)
 652 {
 653         int err;
 654         struct snd_rawmidi_info info;
 655
 656         if (get_user(info.device, &_info->device))
 657                 return -EFAULT;
 658         if (get_user(info.stream, &_info->stream))
 659                 return -EFAULT;
 660         if (get_user(info.subdevice, &_info->subdevice))
 661                 return -EFAULT;
 662         err = snd_rawmidi_info_select(card, &info);
 663         if (err < 0)
 664                 return err;
 665         if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
 666                 return -EFAULT;
 667         return 0;
 668 }
 669
 670 static int resize_runtime_buffer(struct snd_rawmidi_runtime *runtime,
 671                                  struct snd_rawmidi_params *params,
 672                                  bool is_input)
 673 {
 674         char *newbuf, *oldbuf;
 675
 676         if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L)
 677                 return -EINVAL;
 678         if (params->avail_min < 1 || params->avail_min > params->buffer_size)
 679                 return -EINVAL;
 680         if (params->buffer_size != runtime->buffer_size) {
 681                 newbuf = kvzalloc(params->buffer_size, GFP_KERNEL);
 682                 if (!newbuf)
 683                         return -ENOMEM;
 684                 spin_lock_irq(&runtime->lock);
 685                 if (runtime->buffer_ref) {
 686                         spin_unlock_irq(&runtime->lock);
 687                         kvfree(newbuf);
 688                         return -EBUSY;
 689                 }
 690                 oldbuf = runtime->buffer;
 691                 runtime->buffer = newbuf;
 692                 runtime->buffer_size = params->buffer_size;
 693                 __reset_runtime_ptrs(runtime, is_input);
 694                 spin_unlock_irq(&runtime->lock);
 695                 kvfree(oldbuf);
 696         }
 697         runtime->avail_min = params->avail_min;
 698         return 0;
 699 }
 700
 701 int snd_rawmidi_output_params(struct snd_rawmidi_substream *substream,
 702                               struct snd_rawmidi_params *params)
 703 {
 704         if (substream->append && substream->use_count > 1)
 705                 return -EBUSY;
 706         snd_rawmidi_drain_output(substream);
 707         substream->active_sensing = !params->no_active_sensing;
 708         return resize_runtime_buffer(substream->runtime, params, false);
 709 }
 710 EXPORT_SYMBOL(snd_rawmidi_output_params);
 711
 712 int snd_rawmidi_input_params(struct snd_rawmidi_substream *substream,
 713                              struct snd_rawmidi_params *params)
 714 {
 715         snd_rawmidi_drain_input(substream);
 716         return resize_runtime_buffer(substream->runtime, params, true);
 717 }
 718 EXPORT_SYMBOL(snd_rawmidi_input_params);
 719
 720 static int snd_rawmidi_output_status(struct snd_rawmidi_substream *substream,
 721                                      struct snd_rawmidi_status *status)
 722 {
 723         struct snd_rawmidi_runtime *runtime = substream->runtime;
 724
 725         memset(status, 0, sizeof(*status));
 726         status->stream = SNDRV_RAWMIDI_STREAM_OUTPUT;
 727         spin_lock_irq(&runtime->lock);
 728         status->avail = runtime->avail;
 729         spin_unlock_irq(&runtime->lock);
 730         return 0;
 731 }
 732
 733 static int snd_rawmidi_input_status(struct snd_rawmidi_substream *substream,
 734                                     struct snd_rawmidi_status *status)
 735 {
 736         struct snd_rawmidi_runtime *runtime = substream->runtime;
 737
 738         memset(status, 0, sizeof(*status));
 739         status->stream = SNDRV_RAWMIDI_STREAM_INPUT;
 740         spin_lock_irq(&runtime->lock);
 741         status->avail = runtime->avail;
 742         status->xruns = runtime->xruns;
 743         runtime->xruns = 0;
 744         spin_unlock_irq(&runtime->lock);
 745         return 0;
 746 }
 747
 748 static long snd_rawmidi_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 749 {
 750         struct snd_rawmidi_file *rfile;
 751         void __user *argp = (void __user *)arg;
 752
 753         rfile = file->private_data;
 754         if (((cmd >> 8) & 0xff) != 'W')
 755                 return -ENOTTY;
 756         switch (cmd) {
 757         case SNDRV_RAWMIDI_IOCTL_PVERSION:
 758                 return put_user(SNDRV_RAWMIDI_VERSION, (int __user *)argp) ? -EFAULT : 0;
 759         case SNDRV_RAWMIDI_IOCTL_INFO:
 760         {
 761                 int stream;
 762                 struct snd_rawmidi_info __user *info = argp;
 763
 764                 if (get_user(stream, &info->stream))
 765                         return -EFAULT;
 766                 switch (stream) {
 767                 case SNDRV_RAWMIDI_STREAM_INPUT:
 768                         return snd_rawmidi_info_user(rfile->input, info);
 769                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
 770                         return snd_rawmidi_info_user(rfile->output, info);
 771                 default:
 772                         return -EINVAL;
 773                 }
 774         }
 775         case SNDRV_RAWMIDI_IOCTL_PARAMS:
 776         {
 777                 struct snd_rawmidi_params params;
 778
 779                 if (copy_from_user(&params, argp, sizeof(struct snd_rawmidi_params)))
 780                         return -EFAULT;
 781                 switch (params.stream) {
 782                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
 783                         if (rfile->output == NULL)
 784                                 return -EINVAL;
 785                         return snd_rawmidi_output_params(rfile->output, &params);
 786                 case SNDRV_RAWMIDI_STREAM_INPUT:
 787                         if (rfile->input == NULL)
 788                                 return -EINVAL;
 789                         return snd_rawmidi_input_params(rfile->input, &params);
 790                 default:
 791                         return -EINVAL;
 792                 }
 793         }
 794         case SNDRV_RAWMIDI_IOCTL_STATUS:
 795         {
 796                 int err = 0;
 797                 struct snd_rawmidi_status status;
 798
 799                 if (copy_from_user(&status, argp, sizeof(struct snd_rawmidi_status)))
 800                         return -EFAULT;
 801                 switch (status.stream) {
 802                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
 803                         if (rfile->output == NULL)
 804                                 return -EINVAL;
 805                         err = snd_rawmidi_output_status(rfile->output, &status);
 806                         break;
 807                 case SNDRV_RAWMIDI_STREAM_INPUT:
 808                         if (rfile->input == NULL)
 809                                 return -EINVAL;
 810                         err = snd_rawmidi_input_status(rfile->input, &status);
 811                         break;
 812                 default:
 813                         return -EINVAL;
 814                 }
 815                 if (err < 0)
 816                         return err;
 817                 if (copy_to_user(argp, &status, sizeof(struct snd_rawmidi_status)))
 818                         return -EFAULT;
 819                 return 0;
 820         }
 821         case SNDRV_RAWMIDI_IOCTL_DROP:
 822         {
 823                 int val;
 824
 825                 if (get_user(val, (int __user *) argp))
 826                         return -EFAULT;
 827                 switch (val) {
 828                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
 829                         if (rfile->output == NULL)
 830                                 return -EINVAL;
 831                         return snd_rawmidi_drop_output(rfile->output);
 832                 default:
 833                         return -EINVAL;
 834                 }
 835         }
 836         case SNDRV_RAWMIDI_IOCTL_DRAIN:
 837         {
 838                 int val;
 839
 840                 if (get_user(val, (int __user *) argp))
 841                         return -EFAULT;
 842                 switch (val) {
 843                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
 844                         if (rfile->output == NULL)
 845                                 return -EINVAL;
 846                         return snd_rawmidi_drain_output(rfile->output);
 847                 case SNDRV_RAWMIDI_STREAM_INPUT:
 848                         if (rfile->input == NULL)
 849                                 return -EINVAL;
 850                         return snd_rawmidi_drain_input(rfile->input);
 851                 default:
 852                         return -EINVAL;
 853                 }
 854         }
 855         default:
 856                 rmidi_dbg(rfile->rmidi,
 857                           "rawmidi: unknown command = 0x%x\n", cmd);
 858         }
 859         return -ENOTTY;
 860 }
 861
 862 static int snd_rawmidi_control_ioctl(struct snd_card *card,
 863                                      struct snd_ctl_file *control,
 864                                      unsigned int cmd,
 865                                      unsigned long arg)
 866 {
 867         void __user *argp = (void __user *)arg;
 868
 869         switch (cmd) {
 870         case SNDRV_CTL_IOCTL_RAWMIDI_NEXT_DEVICE:
 871         {
 872                 int device;
 873
 874                 if (get_user(device, (int __user *)argp))
 875                         return -EFAULT;
 876                 if (device >= SNDRV_RAWMIDI_DEVICES) /* next device is -1 */
 877                         device = SNDRV_RAWMIDI_DEVICES - 1;
 878                 mutex_lock(&register_mutex);
 879                 device = device < 0 ? 0 : device + 1;
 880                 while (device < SNDRV_RAWMIDI_DEVICES) {
 881                         if (snd_rawmidi_search(card, device))
 882                                 break;
 883                         device++;
 884                 }
 885                 if (device == SNDRV_RAWMIDI_DEVICES)
 886                         device = -1;
 887                 mutex_unlock(&register_mutex);
 888                 if (put_user(device, (int __user *)argp))
 889                         return -EFAULT;
 890                 return 0;
 891         }
 892         case SNDRV_CTL_IOCTL_RAWMIDI_PREFER_SUBDEVICE:
 893         {
 894                 int val;
 895
 896                 if (get_user(val, (int __user *)argp))
 897                         return -EFAULT;
 898                 control->preferred_subdevice[SND_CTL_SUBDEV_RAWMIDI] = val;
 899                 return 0;
 900         }
 901         case SNDRV_CTL_IOCTL_RAWMIDI_INFO:
 902                 return snd_rawmidi_info_select_user(card, argp);
 903         }
 904         return -ENOIOCTLCMD;
 905 }
 906
 907 /**
 908  * snd_rawmidi_receive - receive the input data from the device
 909  * @substream: the rawmidi substream
 910  * @buffer: the buffer pointer
 911  * @count: the data size to read
 912  *
 913  * Reads the data from the internal buffer.
 914  *
 915  * Return: The size of read data, or a negative error code on failure.
 916  */
 917 int snd_rawmidi_receive(struct snd_rawmidi_substream *substream,
 918                         const unsigned char *buffer, int count)
 919 {
 920         unsigned long flags;
 921         int result = 0, count1;
 922         struct snd_rawmidi_runtime *runtime = substream->runtime;
 923
 924         if (!substream->opened)
 925                 return -EBADFD;
 926         if (runtime->buffer == NULL) {
 927                 rmidi_dbg(substream->rmidi,
 928                           "snd_rawmidi_receive: input is not active!!!\n");
 929                 return -EINVAL;
 930         }
 931         spin_lock_irqsave(&runtime->lock, flags);
 932         if (count == 1) {       /* special case, faster code */
 933                 substream->bytes++;
 934                 if (runtime->avail < runtime->buffer_size) {
 935                         runtime->buffer[runtime->hw_ptr++] = buffer[0];
 936                         runtime->hw_ptr %= runtime->buffer_size;
 937                         runtime->avail++;
 938                         result++;
 939                 } else {
 940                         runtime->xruns++;
 941                 }
 942         } else {
 943                 substream->bytes += count;
 944                 count1 = runtime->buffer_size - runtime->hw_ptr;
 945                 if (count1 > count)
 946                         count1 = count;
 947                 if (count1 > (int)(runtime->buffer_size - runtime->avail))
 948                         count1 = runtime->buffer_size - runtime->avail;
 949                 memcpy(runtime->buffer + runtime->hw_ptr, buffer, count1);
 950                 runtime->hw_ptr += count1;
 951                 runtime->hw_ptr %= runtime->buffer_size;
 952                 runtime->avail += count1;
 953                 count -= count1;
 954                 result += count1;
 955                 if (count > 0) {
 956                         buffer += count1;
 957                         count1 = count;
 958                         if (count1 > (int)(runtime->buffer_size - runtime->avail)) {
 959                                 count1 = runtime->buffer_size - runtime->avail;
 960                                 runtime->xruns += count - count1;
 961                         }
 962                         if (count1 > 0) {
 963                                 memcpy(runtime->buffer, buffer, count1);
 964                                 runtime->hw_ptr = count1;
 965                                 runtime->avail += count1;
 966                                 result += count1;
 967                         }
 968                 }
 969         }
 970         if (result > 0) {
 971                 if (runtime->event)
 972                         schedule_work(&runtime->event_work);
 973                 else if (__snd_rawmidi_ready(runtime))
 974                         wake_up(&runtime->sleep);
 975         }
 976         spin_unlock_irqrestore(&runtime->lock, flags);
 977         return result;
 978 }
 979 EXPORT_SYMBOL(snd_rawmidi_receive);
 980
 981 static long snd_rawmidi_kernel_read1(struct snd_rawmidi_substream *substream,
 982                                      unsigned char __user *userbuf,
 983                                      unsigned char *kernelbuf, long count)
 984 {
 985         unsigned long flags;
 986         long result = 0, count1;
 987         struct snd_rawmidi_runtime *runtime = substream->runtime;
 988         unsigned long appl_ptr;
 989         int err = 0;
 990
 991         spin_lock_irqsave(&runtime->lock, flags);
 992         snd_rawmidi_buffer_ref(runtime);
 993         while (count > 0 && runtime->avail) {
 994                 count1 = runtime->buffer_size - runtime->appl_ptr;
 995                 if (count1 > count)
 996                         count1 = count;
 997                 if (count1 > (int)runtime->avail)
 998                         count1 = runtime->avail;
 999
1000                 /* update runtime->appl_ptr before unlocking for userbuf */
1001                 appl_ptr = runtime->appl_ptr;
1002                 runtime->appl_ptr += count1;
1003                 runtime->appl_ptr %= runtime->buffer_size;
1004                 runtime->avail -= count1;
1005
1006                 if (kernelbuf)
1007                         memcpy(kernelbuf + result, runtime->buffer + appl_ptr, count1);
1008                 if (userbuf) {
1009                         spin_unlock_irqrestore(&runtime->lock, flags);
1010                         if (copy_to_user(userbuf + result,
1011                                          runtime->buffer + appl_ptr, count1))
1012                                 err = -EFAULT;
1013                         spin_lock_irqsave(&runtime->lock, flags);
1014                         if (err)
1015                                 goto out;
1016                 }
1017                 result += count1;
1018                 count -= count1;
1019         }
1020  out:
1021         snd_rawmidi_buffer_unref(runtime);
1022         spin_unlock_irqrestore(&runtime->lock, flags);
1023         return result > 0 ? result : err;
1024 }
1025
1026 long snd_rawmidi_kernel_read(struct snd_rawmidi_substream *substream,
1027                              unsigned char *buf, long count)
1028 {
1029         snd_rawmidi_input_trigger(substream, 1);
1030         return snd_rawmidi_kernel_read1(substream, NULL/*userbuf*/, buf, count);
1031 }
1032 EXPORT_SYMBOL(snd_rawmidi_kernel_read);
1033
1034 static ssize_t snd_rawmidi_read(struct file *file, char __user *buf, size_t count,
1035                                 loff_t *offset)
1036 {
1037         long result;
1038         int count1;
1039         struct snd_rawmidi_file *rfile;
1040         struct snd_rawmidi_substream *substream;
1041         struct snd_rawmidi_runtime *runtime;
1042
1043         rfile = file->private_data;
1044         substream = rfile->input;
1045         if (substream == NULL)
1046                 return -EIO;
1047         runtime = substream->runtime;
1048         snd_rawmidi_input_trigger(substream, 1);
1049         result = 0;
1050         while (count > 0) {
1051                 spin_lock_irq(&runtime->lock);
1052                 while (!__snd_rawmidi_ready(runtime)) {
1053                         wait_queue_entry_t wait;
1054
1055                         if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1056                                 spin_unlock_irq(&runtime->lock);
1057                                 return result > 0 ? result : -EAGAIN;
1058                         }
1059                         init_waitqueue_entry(&wait, current);
1060                         add_wait_queue(&runtime->sleep, &wait);
1061                         set_current_state(TASK_INTERRUPTIBLE);
1062                         spin_unlock_irq(&runtime->lock);
1063                         schedule();
1064                         remove_wait_queue(&runtime->sleep, &wait);
1065                         if (rfile->rmidi->card->shutdown)
1066                                 return -ENODEV;
1067                         if (signal_pending(current))
1068                                 return result > 0 ? result : -ERESTARTSYS;
1069                         spin_lock_irq(&runtime->lock);
1070                         if (!runtime->avail) {
1071                                 spin_unlock_irq(&runtime->lock);
1072                                 return result > 0 ? result : -EIO;
1073                         }
1074                 }
1075                 spin_unlock_irq(&runtime->lock);
1076                 count1 = snd_rawmidi_kernel_read1(substream,
1077                                                   (unsigned char __user *)buf,
1078                                                   NULL/*kernelbuf*/,
1079                                                   count);
1080                 if (count1 < 0)
1081                         return result > 0 ? result : count1;
1082                 result += count1;
1083                 buf += count1;
1084                 count -= count1;
1085         }
1086         return result;
1087 }
1088
1089 /**
1090  * snd_rawmidi_transmit_empty - check whether the output buffer is empty
1091  * @substream: the rawmidi substream
1092  *
1093  * Return: 1 if the internal output buffer is empty, 0 if not.
1094  */
1095 int snd_rawmidi_transmit_empty(struct snd_rawmidi_substream *substream)
1096 {
1097         struct snd_rawmidi_runtime *runtime = substream->runtime;
1098         int result;
1099         unsigned long flags;
1100
1101         if (runtime->buffer == NULL) {
1102                 rmidi_dbg(substream->rmidi,
1103                           "snd_rawmidi_transmit_empty: output is not active!!!\n");
1104                 return 1;
1105         }
1106         spin_lock_irqsave(&runtime->lock, flags);
1107         result = runtime->avail >= runtime->buffer_size;
1108         spin_unlock_irqrestore(&runtime->lock, flags);
1109         return result;
1110 }
1111 EXPORT_SYMBOL(snd_rawmidi_transmit_empty);
1112
1113 /**
1114  * __snd_rawmidi_transmit_peek - copy data from the internal buffer
1115  * @substream: the rawmidi substream
1116  * @buffer: the buffer pointer
1117  * @count: data size to transfer
1118  *
1119  * This is a variant of snd_rawmidi_transmit_peek() without spinlock.
1120  */
1121 int __snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
1122                               unsigned char *buffer, int count)
1123 {
1124         int result, count1;
1125         struct snd_rawmidi_runtime *runtime = substream->runtime;
1126
1127         if (runtime->buffer == NULL) {
1128                 rmidi_dbg(substream->rmidi,
1129                           "snd_rawmidi_transmit_peek: output is not active!!!\n");
1130                 return -EINVAL;
1131         }
1132         result = 0;
1133         if (runtime->avail >= runtime->buffer_size) {
1134                 /* warning: lowlevel layer MUST trigger down the hardware */
1135                 goto __skip;
1136         }
1137         if (count == 1) {       /* special case, faster code */
1138                 *buffer = runtime->buffer[runtime->hw_ptr];
1139                 result++;
1140         } else {
1141                 count1 = runtime->buffer_size - runtime->hw_ptr;
1142                 if (count1 > count)
1143                         count1 = count;
1144                 if (count1 > (int)(runtime->buffer_size - runtime->avail))
1145                         count1 = runtime->buffer_size - runtime->avail;
1146                 memcpy(buffer, runtime->buffer + runtime->hw_ptr, count1);
1147                 count -= count1;
1148                 result += count1;
1149                 if (count > 0) {
1150                         if (count > (int)(runtime->buffer_size - runtime->avail - count1))
1151                                 count = runtime->buffer_size - runtime->avail - count1;
1152                         memcpy(buffer + count1, runtime->buffer, count);
1153                         result += count;
1154                 }
1155         }
1156       __skip:
1157         return result;
1158 }
1159 EXPORT_SYMBOL(__snd_rawmidi_transmit_peek);
1160
1161 /**
1162  * snd_rawmidi_transmit_peek - copy data from the internal buffer
1163  * @substream: the rawmidi substream
1164  * @buffer: the buffer pointer
1165  * @count: data size to transfer
1166  *
1167  * Copies data from the internal output buffer to the given buffer.
1168  *
1169  * Call this in the interrupt handler when the midi output is ready,
1170  * and call snd_rawmidi_transmit_ack() after the transmission is
1171  * finished.
1172  *
1173  * Return: The size of copied data, or a negative error code on failure.
1174  */
1175 int snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
1176                               unsigned char *buffer, int count)
1177 {
1178         struct snd_rawmidi_runtime *runtime = substream->runtime;
1179         int result;
1180         unsigned long flags;
1181
1182         spin_lock_irqsave(&runtime->lock, flags);
1183         result = __snd_rawmidi_transmit_peek(substream, buffer, count);
1184         spin_unlock_irqrestore(&runtime->lock, flags);
1185         return result;
1186 }
1187 EXPORT_SYMBOL(snd_rawmidi_transmit_peek);
1188
1189 /**
1190  * __snd_rawmidi_transmit_ack - acknowledge the transmission
1191  * @substream: the rawmidi substream
1192  * @count: the transferred count
1193  *
1194  * This is a variant of __snd_rawmidi_transmit_ack() without spinlock.
1195  */
1196 int __snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count)
1197 {
1198         struct snd_rawmidi_runtime *runtime = substream->runtime;
1199
1200         if (runtime->buffer == NULL) {
1201                 rmidi_dbg(substream->rmidi,
1202                           "snd_rawmidi_transmit_ack: output is not active!!!\n");
1203                 return -EINVAL;
1204         }
1205         snd_BUG_ON(runtime->avail + count > runtime->buffer_size);
1206         runtime->hw_ptr += count;
1207         runtime->hw_ptr %= runtime->buffer_size;
1208         runtime->avail += count;
1209         substream->bytes += count;
1210         if (count > 0) {
1211                 if (runtime->drain || __snd_rawmidi_ready(runtime))
1212                         wake_up(&runtime->sleep);
1213         }
1214         return count;
1215 }
1216 EXPORT_SYMBOL(__snd_rawmidi_transmit_ack);
1217
1218 /**
1219  * snd_rawmidi_transmit_ack - acknowledge the transmission
1220  * @substream: the rawmidi substream
1221  * @count: the transferred count
1222  *
1223  * Advances the hardware pointer for the internal output buffer with
1224  * the given size and updates the condition.
1225  * Call after the transmission is finished.
1226  *
1227  * Return: The advanced size if successful, or a negative error code on failure.
1228  */
1229 int snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count)
1230 {
1231         struct snd_rawmidi_runtime *runtime = substream->runtime;
1232         int result;
1233         unsigned long flags;
1234
1235         spin_lock_irqsave(&runtime->lock, flags);
1236         result = __snd_rawmidi_transmit_ack(substream, count);
1237         spin_unlock_irqrestore(&runtime->lock, flags);
1238         return result;
1239 }
1240 EXPORT_SYMBOL(snd_rawmidi_transmit_ack);
1241
1242 /**
1243  * snd_rawmidi_transmit - copy from the buffer to the device
1244  * @substream: the rawmidi substream
1245  * @buffer: the buffer pointer
1246  * @count: the data size to transfer
1247  *
1248  * Copies data from the buffer to the device and advances the pointer.
1249  *
1250  * Return: The copied size if successful, or a negative error code on failure.
1251  */
1252 int snd_rawmidi_transmit(struct snd_rawmidi_substream *substream,
1253                          unsigned char *buffer, int count)
1254 {
1255         struct snd_rawmidi_runtime *runtime = substream->runtime;
1256         int result;
1257         unsigned long flags;
1258
1259         spin_lock_irqsave(&runtime->lock, flags);
1260         if (!substream->opened)
1261                 result = -EBADFD;
1262         else {
1263                 count = __snd_rawmidi_transmit_peek(substream, buffer, count);
1264                 if (count <= 0)
1265                         result = count;
1266                 else
1267                         result = __snd_rawmidi_transmit_ack(substream, count);
1268         }
1269         spin_unlock_irqrestore(&runtime->lock, flags);
1270         return result;
1271 }
1272 EXPORT_SYMBOL(snd_rawmidi_transmit);
1273
1274 static long snd_rawmidi_kernel_write1(struct snd_rawmidi_substream *substream,
1275                                       const unsigned char __user *userbuf,
1276                                       const unsigned char *kernelbuf,
1277                                       long count)
1278 {
1279         unsigned long flags;
1280         long count1, result;
1281         struct snd_rawmidi_runtime *runtime = substream->runtime;
1282         unsigned long appl_ptr;
1283
1284         if (!kernelbuf && !userbuf)
1285                 return -EINVAL;
1286         if (snd_BUG_ON(!runtime->buffer))
1287                 return -EINVAL;
1288
1289         result = 0;
1290         spin_lock_irqsave(&runtime->lock, flags);
1291         if (substream->append) {
1292                 if ((long)runtime->avail < count) {
1293                         spin_unlock_irqrestore(&runtime->lock, flags);
1294                         return -EAGAIN;
1295                 }
1296         }
1297         snd_rawmidi_buffer_ref(runtime);
1298         while (count > 0 && runtime->avail > 0) {
1299                 count1 = runtime->buffer_size - runtime->appl_ptr;
1300                 if (count1 > count)
1301                         count1 = count;
1302                 if (count1 > (long)runtime->avail)
1303                         count1 = runtime->avail;
1304
1305                 /* update runtime->appl_ptr before unlocking for userbuf */
1306                 appl_ptr = runtime->appl_ptr;
1307                 runtime->appl_ptr += count1;
1308                 runtime->appl_ptr %= runtime->buffer_size;
1309                 runtime->avail -= count1;
1310
1311                 if (kernelbuf)
1312                         memcpy(runtime->buffer + appl_ptr,
1313                                kernelbuf + result, count1);
1314                 else if (userbuf) {
1315                         spin_unlock_irqrestore(&runtime->lock, flags);
1316                         if (copy_from_user(runtime->buffer + appl_ptr,
1317                                            userbuf + result, count1)) {
1318                                 spin_lock_irqsave(&runtime->lock, flags);
1319                                 result = result > 0 ? result : -EFAULT;
1320                                 goto __end;
1321                         }
1322                         spin_lock_irqsave(&runtime->lock, flags);
1323                 }
1324                 result += count1;
1325                 count -= count1;
1326         }
1327       __end:
1328         count1 = runtime->avail < runtime->buffer_size;
1329         snd_rawmidi_buffer_unref(runtime);
1330         spin_unlock_irqrestore(&runtime->lock, flags);
1331         if (count1)
1332                 snd_rawmidi_output_trigger(substream, 1);
1333         return result;
1334 }
1335
1336 long snd_rawmidi_kernel_write(struct snd_rawmidi_substream *substream,
1337                               const unsigned char *buf, long count)
1338 {
1339         return snd_rawmidi_kernel_write1(substream, NULL, buf, count);
1340 }
1341 EXPORT_SYMBOL(snd_rawmidi_kernel_write);
1342
1343 static ssize_t snd_rawmidi_write(struct file *file, const char __user *buf,
1344                                  size_t count, loff_t *offset)
1345 {
1346         long result, timeout;
1347         int count1;
1348         struct snd_rawmidi_file *rfile;
1349         struct snd_rawmidi_runtime *runtime;
1350         struct snd_rawmidi_substream *substream;
1351
1352         rfile = file->private_data;
1353         substream = rfile->output;
1354         runtime = substream->runtime;
1355         /* we cannot put an atomic message to our buffer */
1356         if (substream->append && count > runtime->buffer_size)
1357                 return -EIO;
1358         result = 0;
1359         while (count > 0) {
1360                 spin_lock_irq(&runtime->lock);
1361                 while (!snd_rawmidi_ready_append(substream, count)) {
1362                         wait_queue_entry_t wait;
1363
1364                         if (file->f_flags & O_NONBLOCK) {
1365                                 spin_unlock_irq(&runtime->lock);
1366                                 return result > 0 ? result : -EAGAIN;
1367                         }
1368                         init_waitqueue_entry(&wait, current);
1369                         add_wait_queue(&runtime->sleep, &wait);
1370                         set_current_state(TASK_INTERRUPTIBLE);
1371                         spin_unlock_irq(&runtime->lock);
1372                         timeout = schedule_timeout(30 * HZ);
1373                         remove_wait_queue(&runtime->sleep, &wait);
1374                         if (rfile->rmidi->card->shutdown)
1375                                 return -ENODEV;
1376                         if (signal_pending(current))
1377                                 return result > 0 ? result : -ERESTARTSYS;
1378                         spin_lock_irq(&runtime->lock);
1379                         if (!runtime->avail && !timeout) {
1380                                 spin_unlock_irq(&runtime->lock);
1381                                 return result > 0 ? result : -EIO;
1382                         }
1383                 }
1384                 spin_unlock_irq(&runtime->lock);
1385                 count1 = snd_rawmidi_kernel_write1(substream, buf, NULL, count);
1386                 if (count1 < 0)
1387                         return result > 0 ? result : count1;
1388                 result += count1;
1389                 buf += count1;
1390                 if ((size_t)count1 < count && (file->f_flags & O_NONBLOCK))
1391                         break;
1392                 count -= count1;
1393         }
1394         if (file->f_flags & O_DSYNC) {
1395                 spin_lock_irq(&runtime->lock);
1396                 while (runtime->avail != runtime->buffer_size) {
1397                         wait_queue_entry_t wait;
1398                         unsigned int last_avail = runtime->avail;
1399
1400                         init_waitqueue_entry(&wait, current);
1401                         add_wait_queue(&runtime->sleep, &wait);
1402                         set_current_state(TASK_INTERRUPTIBLE);
1403                         spin_unlock_irq(&runtime->lock);
1404                         timeout = schedule_timeout(30 * HZ);
1405                         remove_wait_queue(&runtime->sleep, &wait);
1406                         if (signal_pending(current))
1407                                 return result > 0 ? result : -ERESTARTSYS;
1408                         if (runtime->avail == last_avail && !timeout)
1409                                 return result > 0 ? result : -EIO;
1410                         spin_lock_irq(&runtime->lock);
1411                 }
1412                 spin_unlock_irq(&runtime->lock);
1413         }
1414         return result;
1415 }
1416
1417 static __poll_t snd_rawmidi_poll(struct file *file, poll_table *wait)
1418 {
1419         struct snd_rawmidi_file *rfile;
1420         struct snd_rawmidi_runtime *runtime;
1421         __poll_t mask;
1422
1423         rfile = file->private_data;
1424         if (rfile->input != NULL) {
1425                 runtime = rfile->input->runtime;
1426                 snd_rawmidi_input_trigger(rfile->input, 1);
1427                 poll_wait(file, &runtime->sleep, wait);
1428         }
1429         if (rfile->output != NULL) {
1430                 runtime = rfile->output->runtime;
1431                 poll_wait(file, &runtime->sleep, wait);
1432         }
1433         mask = 0;
1434         if (rfile->input != NULL) {
1435                 if (snd_rawmidi_ready(rfile->input))
1436                         mask |= EPOLLIN | EPOLLRDNORM;
1437         }
1438         if (rfile->output != NULL) {
1439                 if (snd_rawmidi_ready(rfile->output))
1440                         mask |= EPOLLOUT | EPOLLWRNORM;
1441         }
1442         return mask;
1443 }
1444
1445 /*
1446  */
1447 #ifdef CONFIG_COMPAT
1448 #include "rawmidi_compat.c"
1449 #else
1450 #define snd_rawmidi_ioctl_compat        NULL
1451 #endif
1452
1453 /*
1454  */
1455
1456 static void snd_rawmidi_proc_info_read(struct snd_info_entry *entry,
1457                                        struct snd_info_buffer *buffer)
1458 {
1459         struct snd_rawmidi *rmidi;
1460         struct snd_rawmidi_substream *substream;
1461         struct snd_rawmidi_runtime *runtime;
1462         unsigned long buffer_size, avail, xruns;
1463
1464         rmidi = entry->private_data;
1465         snd_iprintf(buffer, "%s\n\n", rmidi->name);
1466         mutex_lock(&rmidi->open_mutex);
1467         if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_OUTPUT) {
1468                 list_for_each_entry(substream,
1469                                     &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams,
1470                                     list) {
1471                         snd_iprintf(buffer,
1472                                     "Output %d\n"
1473                                     "  Tx bytes     : %lu\n",
1474                                     substream->number,
1475                                     (unsigned long) substream->bytes);
1476                         if (substream->opened) {
1477                                 snd_iprintf(buffer,
1478                                     "  Owner PID    : %d\n",
1479                                     pid_vnr(substream->pid));
1480                                 runtime = substream->runtime;
1481                                 spin_lock_irq(&runtime->lock);
1482                                 buffer_size = runtime->buffer_size;
1483                                 avail = runtime->avail;
1484                                 spin_unlock_irq(&runtime->lock);
1485                                 snd_iprintf(buffer,
1486                                     "  Mode         : %s\n"
1487                                     "  Buffer size  : %lu\n"
1488                                     "  Avail        : %lu\n",
1489                                     runtime->oss ? "OSS compatible" : "native",
1490                                     buffer_size, avail);
1491                         }
1492                 }
1493         }
1494         if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_INPUT) {
1495                 list_for_each_entry(substream,
1496                                     &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams,
1497                                     list) {
1498                         snd_iprintf(buffer,
1499                                     "Input %d\n"
1500                                     "  Rx bytes     : %lu\n",
1501                                     substream->number,
1502                                     (unsigned long) substream->bytes);
1503                         if (substream->opened) {
1504                                 snd_iprintf(buffer,
1505                                             "  Owner PID    : %d\n",
1506                                             pid_vnr(substream->pid));
1507                                 runtime = substream->runtime;
1508                                 spin_lock_irq(&runtime->lock);
1509                                 buffer_size = runtime->buffer_size;
1510                                 avail = runtime->avail;
1511                                 xruns = runtime->xruns;
1512                                 spin_unlock_irq(&runtime->lock);
1513                                 snd_iprintf(buffer,
1514                                             "  Buffer size  : %lu\n"
1515                                             "  Avail        : %lu\n"
1516                                             "  Overruns     : %lu\n",
1517                                             buffer_size, avail, xruns);
1518                         }
1519                 }
1520         }
1521         mutex_unlock(&rmidi->open_mutex);
1522 }
1523
1524 /*
1525  *  Register functions
1526  */
1527
1528 static const struct file_operations snd_rawmidi_f_ops = {
1529         .owner =        THIS_MODULE,
1530         .read =         snd_rawmidi_read,
1531         .write =        snd_rawmidi_write,
1532         .open =         snd_rawmidi_open,
1533         .release =      snd_rawmidi_release,
1534         .llseek =       no_llseek,
1535         .poll =         snd_rawmidi_poll,
1536         .unlocked_ioctl =       snd_rawmidi_ioctl,
1537         .compat_ioctl = snd_rawmidi_ioctl_compat,
1538 };
1539
1540 static int snd_rawmidi_alloc_substreams(struct snd_rawmidi *rmidi,
1541                                         struct snd_rawmidi_str *stream,
1542                                         int direction,
1543                                         int count)
1544 {
1545         struct snd_rawmidi_substream *substream;
1546         int idx;
1547
1548         for (idx = 0; idx < count; idx++) {
1549                 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
1550                 if (!substream)
1551                         return -ENOMEM;
1552                 substream->stream = direction;
1553                 substream->number = idx;
1554                 substream->rmidi = rmidi;
1555                 substream->pstr = stream;
1556                 list_add_tail(&substream->list, &stream->substreams);
1557                 stream->substream_count++;
1558         }
1559         return 0;
1560 }
1561
1562 static void release_rawmidi_device(struct device *dev)
1563 {
1564         kfree(container_of(dev, struct snd_rawmidi, dev));
1565 }
1566
1567 /**
1568  * snd_rawmidi_new - create a rawmidi instance
1569  * @card: the card instance
1570  * @id: the id string
1571  * @device: the device index
1572  * @output_count: the number of output streams
1573  * @input_count: the number of input streams
1574  * @rrawmidi: the pointer to store the new rawmidi instance
1575  *
1576  * Creates a new rawmidi instance.
1577  * Use snd_rawmidi_set_ops() to set the operators to the new instance.
1578  *
1579  * Return: Zero if successful, or a negative error code on failure.
1580  */
1581 int snd_rawmidi_new(struct snd_card *card, char *id, int device,
1582                     int output_count, int input_count,
1583                     struct snd_rawmidi **rrawmidi)
1584 {
1585         struct snd_rawmidi *rmidi;
1586         int err;
1587         static struct snd_device_ops ops = {
1588                 .dev_free = snd_rawmidi_dev_free,
1589                 .dev_register = snd_rawmidi_dev_register,
1590                 .dev_disconnect = snd_rawmidi_dev_disconnect,
1591         };
1592
1593         if (snd_BUG_ON(!card))
1594                 return -ENXIO;
1595         if (rrawmidi)
1596                 *rrawmidi = NULL;
1597         rmidi = kzalloc(sizeof(*rmidi), GFP_KERNEL);
1598         if (!rmidi)
1599                 return -ENOMEM;
1600         rmidi->card = card;
1601         rmidi->device = device;
1602         mutex_init(&rmidi->open_mutex);
1603         init_waitqueue_head(&rmidi->open_wait);
1604         INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams);
1605         INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams);
1606
1607         if (id != NULL)
1608                 strlcpy(rmidi->id, id, sizeof(rmidi->id));
1609
1610         snd_device_initialize(&rmidi->dev, card);
1611         rmidi->dev.release = release_rawmidi_device;
1612         dev_set_name(&rmidi->dev, "midiC%iD%i", card->number, device);
1613
1614         err = snd_rawmidi_alloc_substreams(rmidi,
1615                                            &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT],
1616                                            SNDRV_RAWMIDI_STREAM_INPUT,
1617                                            input_count);
1618         if (err < 0)
1619                 goto error;
1620         err = snd_rawmidi_alloc_substreams(rmidi,
1621                                            &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT],
1622                                            SNDRV_RAWMIDI_STREAM_OUTPUT,
1623                                            output_count);
1624         if (err < 0)
1625                 goto error;
1626         err = snd_device_new(card, SNDRV_DEV_RAWMIDI, rmidi, &ops);
1627         if (err < 0)
1628                 goto error;
1629
1630         if (rrawmidi)
1631                 *rrawmidi = rmidi;
1632         return 0;
1633
1634  error:
1635         snd_rawmidi_free(rmidi);
1636         return err;
1637 }
1638 EXPORT_SYMBOL(snd_rawmidi_new);
1639
1640 static void snd_rawmidi_free_substreams(struct snd_rawmidi_str *stream)
1641 {
1642         struct snd_rawmidi_substream *substream;
1643
1644         while (!list_empty(&stream->substreams)) {
1645                 substream = list_entry(stream->substreams.next, struct snd_rawmidi_substream, list);
1646                 list_del(&substream->list);
1647                 kfree(substream);
1648         }
1649 }
1650
1651 static int snd_rawmidi_free(struct snd_rawmidi *rmidi)
1652 {
1653         if (!rmidi)
1654                 return 0;
1655
1656         snd_info_free_entry(rmidi->proc_entry);
1657         rmidi->proc_entry = NULL;
1658         if (rmidi->ops && rmidi->ops->dev_unregister)
1659                 rmidi->ops->dev_unregister(rmidi);
1660
1661         snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT]);
1662         snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT]);
1663         if (rmidi->private_free)
1664                 rmidi->private_free(rmidi);
1665         put_device(&rmidi->dev);
1666         return 0;
1667 }
1668
1669 static int snd_rawmidi_dev_free(struct snd_device *device)
1670 {
1671         struct snd_rawmidi *rmidi = device->device_data;
1672
1673         return snd_rawmidi_free(rmidi);
1674 }
1675
1676 #if IS_ENABLED(CONFIG_SND_SEQUENCER)
1677 static void snd_rawmidi_dev_seq_free(struct snd_seq_device *device)
1678 {
1679         struct snd_rawmidi *rmidi = device->private_data;
1680
1681         rmidi->seq_dev = NULL;
1682 }
1683 #endif
1684
1685 static int snd_rawmidi_dev_register(struct snd_device *device)
1686 {
1687         int err;
1688         struct snd_info_entry *entry;
1689         char name[16];
1690         struct snd_rawmidi *rmidi = device->device_data;
1691
1692         if (rmidi->device >= SNDRV_RAWMIDI_DEVICES)
1693                 return -ENOMEM;
1694         err = 0;
1695         mutex_lock(&register_mutex);
1696         if (snd_rawmidi_search(rmidi->card, rmidi->device))
1697                 err = -EBUSY;
1698         else
1699                 list_add_tail(&rmidi->list, &snd_rawmidi_devices);
1700         mutex_unlock(&register_mutex);
1701         if (err < 0)
1702                 return err;
1703
1704         err = snd_register_device(SNDRV_DEVICE_TYPE_RAWMIDI,
1705                                   rmidi->card, rmidi->device,
1706                                   &snd_rawmidi_f_ops, rmidi, &rmidi->dev);
1707         if (err < 0) {
1708                 rmidi_err(rmidi, "unable to register\n");
1709                 goto error;
1710         }
1711         if (rmidi->ops && rmidi->ops->dev_register) {
1712                 err = rmidi->ops->dev_register(rmidi);
1713                 if (err < 0)
1714                         goto error_unregister;
1715         }
1716 #ifdef CONFIG_SND_OSSEMUL
1717         rmidi->ossreg = 0;
1718         if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1719                 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1720                                             rmidi->card, 0, &snd_rawmidi_f_ops,
1721                                             rmidi) < 0) {
1722                         rmidi_err(rmidi,
1723                                   "unable to register OSS rawmidi device %i:%i\n",
1724                                   rmidi->card->number, 0);
1725                 } else {
1726                         rmidi->ossreg++;
1727 #ifdef SNDRV_OSS_INFO_DEV_MIDI
1728                         snd_oss_info_register(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number, rmidi->name);
1729 #endif
1730                 }
1731         }
1732         if ((int)rmidi->device == amidi_map[rmidi->card->number]) {
1733                 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1734                                             rmidi->card, 1, &snd_rawmidi_f_ops,
1735                                             rmidi) < 0) {
1736                         rmidi_err(rmidi,
1737                                   "unable to register OSS rawmidi device %i:%i\n",
1738                                   rmidi->card->number, 1);
1739                 } else {
1740                         rmidi->ossreg++;
1741                 }
1742         }
1743 #endif /* CONFIG_SND_OSSEMUL */
1744         sprintf(name, "midi%d", rmidi->device);
1745         entry = snd_info_create_card_entry(rmidi->card, name, rmidi->card->proc_root);
1746         if (entry) {
1747                 entry->private_data = rmidi;
1748                 entry->c.text.read = snd_rawmidi_proc_info_read;
1749                 if (snd_info_register(entry) < 0) {
1750                         snd_info_free_entry(entry);
1751                         entry = NULL;
1752                 }
1753         }
1754         rmidi->proc_entry = entry;
1755 #if IS_ENABLED(CONFIG_SND_SEQUENCER)
1756         if (!rmidi->ops || !rmidi->ops->dev_register) { /* own registration mechanism */
1757                 if (snd_seq_device_new(rmidi->card, rmidi->device, SNDRV_SEQ_DEV_ID_MIDISYNTH, 0, &rmidi->seq_dev) >= 0) {
1758                         rmidi->seq_dev->private_data = rmidi;
1759                         rmidi->seq_dev->private_free = snd_rawmidi_dev_seq_free;
1760                         sprintf(rmidi->seq_dev->name, "MIDI %d-%d", rmidi->card->number, rmidi->device);
1761                         snd_device_register(rmidi->card, rmidi->seq_dev);
1762                 }
1763         }
1764 #endif
1765         return 0;
1766
1767  error_unregister:
1768         snd_unregister_device(&rmidi->dev);
1769  error:
1770         mutex_lock(&register_mutex);
1771         list_del(&rmidi->list);
1772         mutex_unlock(&register_mutex);
1773         return err;
1774 }
1775
1776 static int snd_rawmidi_dev_disconnect(struct snd_device *device)
1777 {
1778         struct snd_rawmidi *rmidi = device->device_data;
1779         int dir;
1780
1781         mutex_lock(&register_mutex);
1782         mutex_lock(&rmidi->open_mutex);
1783         wake_up(&rmidi->open_wait);
1784         list_del_init(&rmidi->list);
1785         for (dir = 0; dir < 2; dir++) {
1786                 struct snd_rawmidi_substream *s;
1787
1788                 list_for_each_entry(s, &rmidi->streams[dir].substreams, list) {
1789                         if (s->runtime)
1790                                 wake_up(&s->runtime->sleep);
1791                 }
1792         }
1793
1794 #ifdef CONFIG_SND_OSSEMUL
1795         if (rmidi->ossreg) {
1796                 if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1797                         snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 0);
1798 #ifdef SNDRV_OSS_INFO_DEV_MIDI
1799                         snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number);
1800 #endif
1801                 }
1802                 if ((int)rmidi->device == amidi_map[rmidi->card->number])
1803                         snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 1);
1804                 rmidi->ossreg = 0;
1805         }
1806 #endif /* CONFIG_SND_OSSEMUL */
1807         snd_unregister_device(&rmidi->dev);
1808         mutex_unlock(&rmidi->open_mutex);
1809         mutex_unlock(&register_mutex);
1810         return 0;
1811 }
1812
1813 /**
1814  * snd_rawmidi_set_ops - set the rawmidi operators
1815  * @rmidi: the rawmidi instance
1816  * @stream: the stream direction, SNDRV_RAWMIDI_STREAM_XXX
1817  * @ops: the operator table
1818  *
1819  * Sets the rawmidi operators for the given stream direction.
1820  */
1821 void snd_rawmidi_set_ops(struct snd_rawmidi *rmidi, int stream,
1822                          const struct snd_rawmidi_ops *ops)
1823 {
1824         struct snd_rawmidi_substream *substream;
1825
1826         list_for_each_entry(substream, &rmidi->streams[stream].substreams, list)
1827                 substream->ops = ops;
1828 }
1829 EXPORT_SYMBOL(snd_rawmidi_set_ops);
1830
1831 /*
1832  *  ENTRY functions
1833  */
1834
1835 static int __init alsa_rawmidi_init(void)
1836 {
1837
1838         snd_ctl_register_ioctl(snd_rawmidi_control_ioctl);
1839         snd_ctl_register_ioctl_compat(snd_rawmidi_control_ioctl);
1840 #ifdef CONFIG_SND_OSSEMUL
1841         { int i;
1842         /* check device map table */
1843         for (i = 0; i < SNDRV_CARDS; i++) {
1844                 if (midi_map[i] < 0 || midi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1845                         pr_err("ALSA: rawmidi: invalid midi_map[%d] = %d\n",
1846                                i, midi_map[i]);
1847                         midi_map[i] = 0;
1848                 }
1849                 if (amidi_map[i] < 0 || amidi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1850                         pr_err("ALSA: rawmidi: invalid amidi_map[%d] = %d\n",
1851                                i, amidi_map[i]);
1852                         amidi_map[i] = 1;
1853                 }
1854         }
1855         }
1856 #endif /* CONFIG_SND_OSSEMUL */
1857         return 0;
1858 }
1859
1860 static void __exit alsa_rawmidi_exit(void)
1861 {
1862         snd_ctl_unregister_ioctl(snd_rawmidi_control_ioctl);
1863         snd_ctl_unregister_ioctl_compat(snd_rawmidi_control_ioctl);
1864 }
1865
1866 module_init(alsa_rawmidi_init)
1867 module_exit(alsa_rawmidi_exit)