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 *rmidi);
  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 bool __snd_rawmidi_ready(struct snd_rawmidi_runtime *runtime)
  99 {
 100         return runtime->avail >= runtime->avail_min;
 101 }
 102
 103 static bool snd_rawmidi_ready(struct snd_rawmidi_substream *substream)
 104 {
 105         struct snd_rawmidi_runtime *runtime = substream->runtime;
 106         unsigned long flags;
 107         bool ready;
 108
 109         spin_lock_irqsave(&runtime->lock, flags);
 110         ready = __snd_rawmidi_ready(runtime);
 111         spin_unlock_irqrestore(&runtime->lock, flags);
 112         return ready;
 113 }
 114
 115 static inline int snd_rawmidi_ready_append(struct snd_rawmidi_substream *substream,
 116                                            size_t count)
 117 {
 118         struct snd_rawmidi_runtime *runtime = substream->runtime;
 119
 120         return runtime->avail >= runtime->avail_min &&
 121                (!substream->append || runtime->avail >= count);
 122 }
 123
 124 static void snd_rawmidi_input_event_work(struct work_struct *work)
 125 {
 126         struct snd_rawmidi_runtime *runtime =
 127                 container_of(work, struct snd_rawmidi_runtime, event_work);
 128
 129         if (runtime->event)
 130                 runtime->event(runtime->substream);
 131 }
 132
 133 /* buffer refcount management: call with runtime->lock held */
 134 static inline void snd_rawmidi_buffer_ref(struct snd_rawmidi_runtime *runtime)
 135 {
 136         runtime->buffer_ref++;
 137 }
 138
 139 static inline void snd_rawmidi_buffer_unref(struct snd_rawmidi_runtime *runtime)
 140 {
 141         runtime->buffer_ref--;
 142 }
 143
 144 static int snd_rawmidi_runtime_create(struct snd_rawmidi_substream *substream)
 145 {
 146         struct snd_rawmidi_runtime *runtime;
 147
 148         runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
 149         if (!runtime)
 150                 return -ENOMEM;
 151         runtime->substream = substream;
 152         spin_lock_init(&runtime->lock);
 153         init_waitqueue_head(&runtime->sleep);
 154         INIT_WORK(&runtime->event_work, snd_rawmidi_input_event_work);
 155         runtime->event = NULL;
 156         runtime->buffer_size = PAGE_SIZE;
 157         runtime->avail_min = 1;
 158         if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
 159                 runtime->avail = 0;
 160         else
 161                 runtime->avail = runtime->buffer_size;
 162         runtime->buffer = kvzalloc(runtime->buffer_size, GFP_KERNEL);
 163         if (!runtime->buffer) {
 164                 kfree(runtime);
 165                 return -ENOMEM;
 166         }
 167         runtime->appl_ptr = runtime->hw_ptr = 0;
 168         substream->runtime = runtime;
 169         return 0;
 170 }
 171
 172 static int snd_rawmidi_runtime_free(struct snd_rawmidi_substream *substream)
 173 {
 174         struct snd_rawmidi_runtime *runtime = substream->runtime;
 175
 176         kvfree(runtime->buffer);
 177         kfree(runtime);
 178         substream->runtime = NULL;
 179         return 0;
 180 }
 181
 182 static inline void snd_rawmidi_output_trigger(struct snd_rawmidi_substream *substream, int up)
 183 {
 184         if (!substream->opened)
 185                 return;
 186         substream->ops->trigger(substream, up);
 187 }
 188
 189 static void snd_rawmidi_input_trigger(struct snd_rawmidi_substream *substream, int up)
 190 {
 191         if (!substream->opened)
 192                 return;
 193         substream->ops->trigger(substream, up);
 194         if (!up)
 195                 cancel_work_sync(&substream->runtime->event_work);
 196 }
 197
 198 static void __reset_runtime_ptrs(struct snd_rawmidi_runtime *runtime,
 199                                  bool is_input)
 200 {
 201         runtime->drain = 0;
 202         runtime->appl_ptr = runtime->hw_ptr = 0;
 203         runtime->avail = is_input ? 0 : runtime->buffer_size;
 204 }
 205
 206 static void reset_runtime_ptrs(struct snd_rawmidi_runtime *runtime,
 207                                bool is_input)
 208 {
 209         unsigned long flags;
 210
 211         spin_lock_irqsave(&runtime->lock, flags);
 212         __reset_runtime_ptrs(runtime, is_input);
 213         spin_unlock_irqrestore(&runtime->lock, flags);
 214 }
 215
 216 int snd_rawmidi_drop_output(struct snd_rawmidi_substream *substream)
 217 {
 218         snd_rawmidi_output_trigger(substream, 0);
 219         reset_runtime_ptrs(substream->runtime, false);
 220         return 0;
 221 }
 222 EXPORT_SYMBOL(snd_rawmidi_drop_output);
 223
 224 int snd_rawmidi_drain_output(struct snd_rawmidi_substream *substream)
 225 {
 226         int err;
 227         long timeout;
 228         struct snd_rawmidi_runtime *runtime = substream->runtime;
 229
 230         err = 0;
 231         runtime->drain = 1;
 232         timeout = wait_event_interruptible_timeout(runtime->sleep,
 233                                 (runtime->avail >= runtime->buffer_size),
 234                                 10*HZ);
 235         if (signal_pending(current))
 236                 err = -ERESTARTSYS;
 237         if (runtime->avail < runtime->buffer_size && !timeout) {
 238                 rmidi_warn(substream->rmidi,
 239                            "rawmidi drain error (avail = %li, buffer_size = %li)\n",
 240                            (long)runtime->avail, (long)runtime->buffer_size);
 241                 err = -EIO;
 242         }
 243         runtime->drain = 0;
 244         if (err != -ERESTARTSYS) {
 245                 /* we need wait a while to make sure that Tx FIFOs are empty */
 246                 if (substream->ops->drain)
 247                         substream->ops->drain(substream);
 248                 else
 249                         msleep(50);
 250                 snd_rawmidi_drop_output(substream);
 251         }
 252         return err;
 253 }
 254 EXPORT_SYMBOL(snd_rawmidi_drain_output);
 255
 256 int snd_rawmidi_drain_input(struct snd_rawmidi_substream *substream)
 257 {
 258         snd_rawmidi_input_trigger(substream, 0);
 259         reset_runtime_ptrs(substream->runtime, true);
 260         return 0;
 261 }
 262 EXPORT_SYMBOL(snd_rawmidi_drain_input);
 263
 264 /* look for an available substream for the given stream direction;
 265  * if a specific subdevice is given, try to assign it
 266  */
 267 static int assign_substream(struct snd_rawmidi *rmidi, int subdevice,
 268                             int stream, int mode,
 269                             struct snd_rawmidi_substream **sub_ret)
 270 {
 271         struct snd_rawmidi_substream *substream;
 272         struct snd_rawmidi_str *s = &rmidi->streams[stream];
 273         static const unsigned int info_flags[2] = {
 274                 [SNDRV_RAWMIDI_STREAM_OUTPUT] = SNDRV_RAWMIDI_INFO_OUTPUT,
 275                 [SNDRV_RAWMIDI_STREAM_INPUT] = SNDRV_RAWMIDI_INFO_INPUT,
 276         };
 277
 278         if (!(rmidi->info_flags & info_flags[stream]))
 279                 return -ENXIO;
 280         if (subdevice >= 0 && subdevice >= s->substream_count)
 281                 return -ENODEV;
 282
 283         list_for_each_entry(substream, &s->substreams, list) {
 284                 if (substream->opened) {
 285                         if (stream == SNDRV_RAWMIDI_STREAM_INPUT ||
 286                             !(mode & SNDRV_RAWMIDI_LFLG_APPEND) ||
 287                             !substream->append)
 288                                 continue;
 289                 }
 290                 if (subdevice < 0 || subdevice == substream->number) {
 291                         *sub_ret = substream;
 292                         return 0;
 293                 }
 294         }
 295         return -EAGAIN;
 296 }
 297
 298 /* open and do ref-counting for the given substream */
 299 static int open_substream(struct snd_rawmidi *rmidi,
 300                           struct snd_rawmidi_substream *substream,
 301                           int mode)
 302 {
 303         int err;
 304
 305         if (substream->use_count == 0) {
 306                 err = snd_rawmidi_runtime_create(substream);
 307                 if (err < 0)
 308                         return err;
 309                 err = substream->ops->open(substream);
 310                 if (err < 0) {
 311                         snd_rawmidi_runtime_free(substream);
 312                         return err;
 313                 }
 314                 substream->opened = 1;
 315                 substream->active_sensing = 0;
 316                 if (mode & SNDRV_RAWMIDI_LFLG_APPEND)
 317                         substream->append = 1;
 318                 substream->pid = get_pid(task_pid(current));
 319                 rmidi->streams[substream->stream].substream_opened++;
 320         }
 321         substream->use_count++;
 322         return 0;
 323 }
 324
 325 static void close_substream(struct snd_rawmidi *rmidi,
 326                             struct snd_rawmidi_substream *substream,
 327                             int cleanup);
 328
 329 static int rawmidi_open_priv(struct snd_rawmidi *rmidi, int subdevice, int mode,
 330                              struct snd_rawmidi_file *rfile)
 331 {
 332         struct snd_rawmidi_substream *sinput = NULL, *soutput = NULL;
 333         int err;
 334
 335         rfile->input = rfile->output = NULL;
 336         if (mode & SNDRV_RAWMIDI_LFLG_INPUT) {
 337                 err = assign_substream(rmidi, subdevice,
 338                                        SNDRV_RAWMIDI_STREAM_INPUT,
 339                                        mode, &sinput);
 340                 if (err < 0)
 341                         return err;
 342         }
 343         if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) {
 344                 err = assign_substream(rmidi, subdevice,
 345                                        SNDRV_RAWMIDI_STREAM_OUTPUT,
 346                                        mode, &soutput);
 347                 if (err < 0)
 348                         return err;
 349         }
 350
 351         if (sinput) {
 352                 err = open_substream(rmidi, sinput, mode);
 353                 if (err < 0)
 354                         return err;
 355         }
 356         if (soutput) {
 357                 err = open_substream(rmidi, soutput, mode);
 358                 if (err < 0) {
 359                         if (sinput)
 360                                 close_substream(rmidi, sinput, 0);
 361                         return err;
 362                 }
 363         }
 364
 365         rfile->rmidi = rmidi;
 366         rfile->input = sinput;
 367         rfile->output = soutput;
 368         return 0;
 369 }
 370
 371 /* called from sound/core/seq/seq_midi.c */
 372 int snd_rawmidi_kernel_open(struct snd_card *card, int device, int subdevice,
 373                             int mode, struct snd_rawmidi_file *rfile)
 374 {
 375         struct snd_rawmidi *rmidi;
 376         int err = 0;
 377
 378         if (snd_BUG_ON(!rfile))
 379                 return -EINVAL;
 380
 381         mutex_lock(&register_mutex);
 382         rmidi = snd_rawmidi_search(card, device);
 383         if (!rmidi)
 384                 err = -ENODEV;
 385         else if (!try_module_get(rmidi->card->module))
 386                 err = -ENXIO;
 387         mutex_unlock(&register_mutex);
 388         if (err < 0)
 389                 return err;
 390
 391         mutex_lock(&rmidi->open_mutex);
 392         err = rawmidi_open_priv(rmidi, subdevice, mode, rfile);
 393         mutex_unlock(&rmidi->open_mutex);
 394         if (err < 0)
 395                 module_put(rmidi->card->module);
 396         return err;
 397 }
 398 EXPORT_SYMBOL(snd_rawmidi_kernel_open);
 399
 400 static int snd_rawmidi_open(struct inode *inode, struct file *file)
 401 {
 402         int maj = imajor(inode);
 403         struct snd_card *card;
 404         int subdevice;
 405         unsigned short fflags;
 406         int err;
 407         struct snd_rawmidi *rmidi;
 408         struct snd_rawmidi_file *rawmidi_file = NULL;
 409         wait_queue_entry_t wait;
 410
 411         if ((file->f_flags & O_APPEND) && !(file->f_flags & O_NONBLOCK))
 412                 return -EINVAL;         /* invalid combination */
 413
 414         err = stream_open(inode, file);
 415         if (err < 0)
 416                 return err;
 417
 418         if (maj == snd_major) {
 419                 rmidi = snd_lookup_minor_data(iminor(inode),
 420                                               SNDRV_DEVICE_TYPE_RAWMIDI);
 421 #ifdef CONFIG_SND_OSSEMUL
 422         } else if (maj == SOUND_MAJOR) {
 423                 rmidi = snd_lookup_oss_minor_data(iminor(inode),
 424                                                   SNDRV_OSS_DEVICE_TYPE_MIDI);
 425 #endif
 426         } else
 427                 return -ENXIO;
 428
 429         if (rmidi == NULL)
 430                 return -ENODEV;
 431
 432         if (!try_module_get(rmidi->card->module)) {
 433                 snd_card_unref(rmidi->card);
 434                 return -ENXIO;
 435         }
 436
 437         mutex_lock(&rmidi->open_mutex);
 438         card = rmidi->card;
 439         err = snd_card_file_add(card, file);
 440         if (err < 0)
 441                 goto __error_card;
 442         fflags = snd_rawmidi_file_flags(file);
 443         if ((file->f_flags & O_APPEND) || maj == SOUND_MAJOR) /* OSS emul? */
 444                 fflags |= SNDRV_RAWMIDI_LFLG_APPEND;
 445         rawmidi_file = kmalloc(sizeof(*rawmidi_file), GFP_KERNEL);
 446         if (rawmidi_file == NULL) {
 447                 err = -ENOMEM;
 448                 goto __error;
 449         }
 450         init_waitqueue_entry(&wait, current);
 451         add_wait_queue(&rmidi->open_wait, &wait);
 452         while (1) {
 453                 subdevice = snd_ctl_get_preferred_subdevice(card, SND_CTL_SUBDEV_RAWMIDI);
 454                 err = rawmidi_open_priv(rmidi, subdevice, fflags, rawmidi_file);
 455                 if (err >= 0)
 456                         break;
 457                 if (err == -EAGAIN) {
 458                         if (file->f_flags & O_NONBLOCK) {
 459                                 err = -EBUSY;
 460                                 break;
 461                         }
 462                 } else
 463                         break;
 464                 set_current_state(TASK_INTERRUPTIBLE);
 465                 mutex_unlock(&rmidi->open_mutex);
 466                 schedule();
 467                 mutex_lock(&rmidi->open_mutex);
 468                 if (rmidi->card->shutdown) {
 469                         err = -ENODEV;
 470                         break;
 471                 }
 472                 if (signal_pending(current)) {
 473                         err = -ERESTARTSYS;
 474                         break;
 475                 }
 476         }
 477         remove_wait_queue(&rmidi->open_wait, &wait);
 478         if (err < 0) {
 479                 kfree(rawmidi_file);
 480                 goto __error;
 481         }
 482 #ifdef CONFIG_SND_OSSEMUL
 483         if (rawmidi_file->input && rawmidi_file->input->runtime)
 484                 rawmidi_file->input->runtime->oss = (maj == SOUND_MAJOR);
 485         if (rawmidi_file->output && rawmidi_file->output->runtime)
 486                 rawmidi_file->output->runtime->oss = (maj == SOUND_MAJOR);
 487 #endif
 488         file->private_data = rawmidi_file;
 489         mutex_unlock(&rmidi->open_mutex);
 490         snd_card_unref(rmidi->card);
 491         return 0;
 492
 493  __error:
 494         snd_card_file_remove(card, file);
 495  __error_card:
 496         mutex_unlock(&rmidi->open_mutex);
 497         module_put(rmidi->card->module);
 498         snd_card_unref(rmidi->card);
 499         return err;
 500 }
 501
 502 static void close_substream(struct snd_rawmidi *rmidi,
 503                             struct snd_rawmidi_substream *substream,
 504                             int cleanup)
 505 {
 506         if (--substream->use_count)
 507                 return;
 508
 509         if (cleanup) {
 510                 if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
 511                         snd_rawmidi_input_trigger(substream, 0);
 512                 else {
 513                         if (substream->active_sensing) {
 514                                 unsigned char buf = 0xfe;
 515                                 /* sending single active sensing message
 516                                  * to shut the device up
 517                                  */
 518                                 snd_rawmidi_kernel_write(substream, &buf, 1);
 519                         }
 520                         if (snd_rawmidi_drain_output(substream) == -ERESTARTSYS)
 521                                 snd_rawmidi_output_trigger(substream, 0);
 522                 }
 523         }
 524         substream->ops->close(substream);
 525         if (substream->runtime->private_free)
 526                 substream->runtime->private_free(substream);
 527         snd_rawmidi_runtime_free(substream);
 528         substream->opened = 0;
 529         substream->append = 0;
 530         put_pid(substream->pid);
 531         substream->pid = NULL;
 532         rmidi->streams[substream->stream].substream_opened--;
 533 }
 534
 535 static void rawmidi_release_priv(struct snd_rawmidi_file *rfile)
 536 {
 537         struct snd_rawmidi *rmidi;
 538
 539         rmidi = rfile->rmidi;
 540         mutex_lock(&rmidi->open_mutex);
 541         if (rfile->input) {
 542                 close_substream(rmidi, rfile->input, 1);
 543                 rfile->input = NULL;
 544         }
 545         if (rfile->output) {
 546                 close_substream(rmidi, rfile->output, 1);
 547                 rfile->output = NULL;
 548         }
 549         rfile->rmidi = NULL;
 550         mutex_unlock(&rmidi->open_mutex);
 551         wake_up(&rmidi->open_wait);
 552 }
 553
 554 /* called from sound/core/seq/seq_midi.c */
 555 int snd_rawmidi_kernel_release(struct snd_rawmidi_file *rfile)
 556 {
 557         struct snd_rawmidi *rmidi;
 558
 559         if (snd_BUG_ON(!rfile))
 560                 return -ENXIO;
 561
 562         rmidi = rfile->rmidi;
 563         rawmidi_release_priv(rfile);
 564         module_put(rmidi->card->module);
 565         return 0;
 566 }
 567 EXPORT_SYMBOL(snd_rawmidi_kernel_release);
 568
 569 static int snd_rawmidi_release(struct inode *inode, struct file *file)
 570 {
 571         struct snd_rawmidi_file *rfile;
 572         struct snd_rawmidi *rmidi;
 573         struct module *module;
 574
 575         rfile = file->private_data;
 576         rmidi = rfile->rmidi;
 577         rawmidi_release_priv(rfile);
 578         kfree(rfile);
 579         module = rmidi->card->module;
 580         snd_card_file_remove(rmidi->card, file);
 581         module_put(module);
 582         return 0;
 583 }
 584
 585 static int snd_rawmidi_info(struct snd_rawmidi_substream *substream,
 586                             struct snd_rawmidi_info *info)
 587 {
 588         struct snd_rawmidi *rmidi;
 589
 590         if (substream == NULL)
 591                 return -ENODEV;
 592         rmidi = substream->rmidi;
 593         memset(info, 0, sizeof(*info));
 594         info->card = rmidi->card->number;
 595         info->device = rmidi->device;
 596         info->subdevice = substream->number;
 597         info->stream = substream->stream;
 598         info->flags = rmidi->info_flags;
 599         strcpy(info->id, rmidi->id);
 600         strcpy(info->name, rmidi->name);
 601         strcpy(info->subname, substream->name);
 602         info->subdevices_count = substream->pstr->substream_count;
 603         info->subdevices_avail = (substream->pstr->substream_count -
 604                                   substream->pstr->substream_opened);
 605         return 0;
 606 }
 607
 608 static int snd_rawmidi_info_user(struct snd_rawmidi_substream *substream,
 609                                  struct snd_rawmidi_info __user *_info)
 610 {
 611         struct snd_rawmidi_info info;
 612         int err;
 613
 614         err = snd_rawmidi_info(substream, &info);
 615         if (err < 0)
 616                 return err;
 617         if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
 618                 return -EFAULT;
 619         return 0;
 620 }
 621
 622 static int __snd_rawmidi_info_select(struct snd_card *card,
 623                                      struct snd_rawmidi_info *info)
 624 {
 625         struct snd_rawmidi *rmidi;
 626         struct snd_rawmidi_str *pstr;
 627         struct snd_rawmidi_substream *substream;
 628
 629         rmidi = snd_rawmidi_search(card, info->device);
 630         if (!rmidi)
 631                 return -ENXIO;
 632         if (info->stream < 0 || info->stream > 1)
 633                 return -EINVAL;
 634         info->stream = array_index_nospec(info->stream, 2);
 635         pstr = &rmidi->streams[info->stream];
 636         if (pstr->substream_count == 0)
 637                 return -ENOENT;
 638         if (info->subdevice >= pstr->substream_count)
 639                 return -ENXIO;
 640         list_for_each_entry(substream, &pstr->substreams, list) {
 641                 if ((unsigned int)substream->number == info->subdevice)
 642                         return snd_rawmidi_info(substream, info);
 643         }
 644         return -ENXIO;
 645 }
 646
 647 int snd_rawmidi_info_select(struct snd_card *card, struct snd_rawmidi_info *info)
 648 {
 649         int ret;
 650
 651         mutex_lock(&register_mutex);
 652         ret = __snd_rawmidi_info_select(card, info);
 653         mutex_unlock(&register_mutex);
 654         return ret;
 655 }
 656 EXPORT_SYMBOL(snd_rawmidi_info_select);
 657
 658 static int snd_rawmidi_info_select_user(struct snd_card *card,
 659                                         struct snd_rawmidi_info __user *_info)
 660 {
 661         int err;
 662         struct snd_rawmidi_info info;
 663
 664         if (get_user(info.device, &_info->device))
 665                 return -EFAULT;
 666         if (get_user(info.stream, &_info->stream))
 667                 return -EFAULT;
 668         if (get_user(info.subdevice, &_info->subdevice))
 669                 return -EFAULT;
 670         err = snd_rawmidi_info_select(card, &info);
 671         if (err < 0)
 672                 return err;
 673         if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
 674                 return -EFAULT;
 675         return 0;
 676 }
 677
 678 static int resize_runtime_buffer(struct snd_rawmidi_runtime *runtime,
 679                                  struct snd_rawmidi_params *params,
 680                                  bool is_input)
 681 {
 682         char *newbuf, *oldbuf;
 683
 684         if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L)
 685                 return -EINVAL;
 686         if (params->avail_min < 1 || params->avail_min > params->buffer_size)
 687                 return -EINVAL;
 688         if (params->buffer_size != runtime->buffer_size) {
 689                 newbuf = kvzalloc(params->buffer_size, GFP_KERNEL);
 690                 if (!newbuf)
 691                         return -ENOMEM;
 692                 spin_lock_irq(&runtime->lock);
 693                 if (runtime->buffer_ref) {
 694                         spin_unlock_irq(&runtime->lock);
 695                         kvfree(newbuf);
 696                         return -EBUSY;
 697                 }
 698                 oldbuf = runtime->buffer;
 699                 runtime->buffer = newbuf;
 700                 runtime->buffer_size = params->buffer_size;
 701                 __reset_runtime_ptrs(runtime, is_input);
 702                 spin_unlock_irq(&runtime->lock);
 703                 kvfree(oldbuf);
 704         }
 705         runtime->avail_min = params->avail_min;
 706         return 0;
 707 }
 708
 709 int snd_rawmidi_output_params(struct snd_rawmidi_substream *substream,
 710                               struct snd_rawmidi_params *params)
 711 {
 712         if (substream->append && substream->use_count > 1)
 713                 return -EBUSY;
 714         snd_rawmidi_drain_output(substream);
 715         substream->active_sensing = !params->no_active_sensing;
 716         return resize_runtime_buffer(substream->runtime, params, false);
 717 }
 718 EXPORT_SYMBOL(snd_rawmidi_output_params);
 719
 720 int snd_rawmidi_input_params(struct snd_rawmidi_substream *substream,
 721                              struct snd_rawmidi_params *params)
 722 {
 723         snd_rawmidi_drain_input(substream);
 724         return resize_runtime_buffer(substream->runtime, params, true);
 725 }
 726 EXPORT_SYMBOL(snd_rawmidi_input_params);
 727
 728 static int snd_rawmidi_output_status(struct snd_rawmidi_substream *substream,
 729                                      struct snd_rawmidi_status64 *status)
 730 {
 731         struct snd_rawmidi_runtime *runtime = substream->runtime;
 732
 733         memset(status, 0, sizeof(*status));
 734         status->stream = SNDRV_RAWMIDI_STREAM_OUTPUT;
 735         spin_lock_irq(&runtime->lock);
 736         status->avail = runtime->avail;
 737         spin_unlock_irq(&runtime->lock);
 738         return 0;
 739 }
 740
 741 static int snd_rawmidi_input_status(struct snd_rawmidi_substream *substream,
 742                                     struct snd_rawmidi_status64 *status)
 743 {
 744         struct snd_rawmidi_runtime *runtime = substream->runtime;
 745
 746         memset(status, 0, sizeof(*status));
 747         status->stream = SNDRV_RAWMIDI_STREAM_INPUT;
 748         spin_lock_irq(&runtime->lock);
 749         status->avail = runtime->avail;
 750         status->xruns = runtime->xruns;
 751         runtime->xruns = 0;
 752         spin_unlock_irq(&runtime->lock);
 753         return 0;
 754 }
 755
 756 static int snd_rawmidi_ioctl_status32(struct snd_rawmidi_file *rfile,
 757                                       struct snd_rawmidi_status32 __user *argp)
 758 {
 759         int err = 0;
 760         struct snd_rawmidi_status32 __user *status = argp;
 761         struct snd_rawmidi_status32 status32;
 762         struct snd_rawmidi_status64 status64;
 763
 764         if (copy_from_user(&status32, argp,
 765                            sizeof(struct snd_rawmidi_status32)))
 766                 return -EFAULT;
 767
 768         switch (status32.stream) {
 769         case SNDRV_RAWMIDI_STREAM_OUTPUT:
 770                 if (rfile->output == NULL)
 771                         return -EINVAL;
 772                 err = snd_rawmidi_output_status(rfile->output, &status64);
 773                 break;
 774         case SNDRV_RAWMIDI_STREAM_INPUT:
 775                 if (rfile->input == NULL)
 776                         return -EINVAL;
 777                 err = snd_rawmidi_input_status(rfile->input, &status64);
 778                 break;
 779         default:
 780                 return -EINVAL;
 781         }
 782         if (err < 0)
 783                 return err;
 784
 785         status32 = (struct snd_rawmidi_status32) {
 786                 .stream = status64.stream,
 787                 .tstamp_sec = status64.tstamp_sec,
 788                 .tstamp_nsec = status64.tstamp_nsec,
 789                 .avail = status64.avail,
 790                 .xruns = status64.xruns,
 791         };
 792
 793         if (copy_to_user(status, &status32, sizeof(*status)))
 794                 return -EFAULT;
 795
 796         return 0;
 797 }
 798
 799 static int snd_rawmidi_ioctl_status64(struct snd_rawmidi_file *rfile,
 800                                       struct snd_rawmidi_status64 __user *argp)
 801 {
 802         int err = 0;
 803         struct snd_rawmidi_status64 status;
 804
 805         if (copy_from_user(&status, argp, sizeof(struct snd_rawmidi_status64)))
 806                 return -EFAULT;
 807
 808         switch (status.stream) {
 809         case SNDRV_RAWMIDI_STREAM_OUTPUT:
 810                 if (rfile->output == NULL)
 811                         return -EINVAL;
 812                 err = snd_rawmidi_output_status(rfile->output, &status);
 813                 break;
 814         case SNDRV_RAWMIDI_STREAM_INPUT:
 815                 if (rfile->input == NULL)
 816                         return -EINVAL;
 817                 err = snd_rawmidi_input_status(rfile->input, &status);
 818                 break;
 819         default:
 820                 return -EINVAL;
 821         }
 822         if (err < 0)
 823                 return err;
 824         if (copy_to_user(argp, &status,
 825                          sizeof(struct snd_rawmidi_status64)))
 826                 return -EFAULT;
 827         return 0;
 828 }
 829
 830 static long snd_rawmidi_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 831 {
 832         struct snd_rawmidi_file *rfile;
 833         void __user *argp = (void __user *)arg;
 834
 835         rfile = file->private_data;
 836         if (((cmd >> 8) & 0xff) != 'W')
 837                 return -ENOTTY;
 838         switch (cmd) {
 839         case SNDRV_RAWMIDI_IOCTL_PVERSION:
 840                 return put_user(SNDRV_RAWMIDI_VERSION, (int __user *)argp) ? -EFAULT : 0;
 841         case SNDRV_RAWMIDI_IOCTL_INFO:
 842         {
 843                 int stream;
 844                 struct snd_rawmidi_info __user *info = argp;
 845
 846                 if (get_user(stream, &info->stream))
 847                         return -EFAULT;
 848                 switch (stream) {
 849                 case SNDRV_RAWMIDI_STREAM_INPUT:
 850                         return snd_rawmidi_info_user(rfile->input, info);
 851                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
 852                         return snd_rawmidi_info_user(rfile->output, info);
 853                 default:
 854                         return -EINVAL;
 855                 }
 856         }
 857         case SNDRV_RAWMIDI_IOCTL_PARAMS:
 858         {
 859                 struct snd_rawmidi_params params;
 860
 861                 if (copy_from_user(&params, argp, sizeof(struct snd_rawmidi_params)))
 862                         return -EFAULT;
 863                 switch (params.stream) {
 864                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
 865                         if (rfile->output == NULL)
 866                                 return -EINVAL;
 867                         return snd_rawmidi_output_params(rfile->output, &params);
 868                 case SNDRV_RAWMIDI_STREAM_INPUT:
 869                         if (rfile->input == NULL)
 870                                 return -EINVAL;
 871                         return snd_rawmidi_input_params(rfile->input, &params);
 872                 default:
 873                         return -EINVAL;
 874                 }
 875         }
 876         case SNDRV_RAWMIDI_IOCTL_STATUS32:
 877                 return snd_rawmidi_ioctl_status32(rfile, argp);
 878         case SNDRV_RAWMIDI_IOCTL_STATUS64:
 879                 return snd_rawmidi_ioctl_status64(rfile, argp);
 880         case SNDRV_RAWMIDI_IOCTL_DROP:
 881         {
 882                 int val;
 883
 884                 if (get_user(val, (int __user *) argp))
 885                         return -EFAULT;
 886                 switch (val) {
 887                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
 888                         if (rfile->output == NULL)
 889                                 return -EINVAL;
 890                         return snd_rawmidi_drop_output(rfile->output);
 891                 default:
 892                         return -EINVAL;
 893                 }
 894         }
 895         case SNDRV_RAWMIDI_IOCTL_DRAIN:
 896         {
 897                 int val;
 898
 899                 if (get_user(val, (int __user *) argp))
 900                         return -EFAULT;
 901                 switch (val) {
 902                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
 903                         if (rfile->output == NULL)
 904                                 return -EINVAL;
 905                         return snd_rawmidi_drain_output(rfile->output);
 906                 case SNDRV_RAWMIDI_STREAM_INPUT:
 907                         if (rfile->input == NULL)
 908                                 return -EINVAL;
 909                         return snd_rawmidi_drain_input(rfile->input);
 910                 default:
 911                         return -EINVAL;
 912                 }
 913         }
 914         default:
 915                 rmidi_dbg(rfile->rmidi,
 916                           "rawmidi: unknown command = 0x%x\n", cmd);
 917         }
 918         return -ENOTTY;
 919 }
 920
 921 static int snd_rawmidi_control_ioctl(struct snd_card *card,
 922                                      struct snd_ctl_file *control,
 923                                      unsigned int cmd,
 924                                      unsigned long arg)
 925 {
 926         void __user *argp = (void __user *)arg;
 927
 928         switch (cmd) {
 929         case SNDRV_CTL_IOCTL_RAWMIDI_NEXT_DEVICE:
 930         {
 931                 int device;
 932
 933                 if (get_user(device, (int __user *)argp))
 934                         return -EFAULT;
 935                 if (device >= SNDRV_RAWMIDI_DEVICES) /* next device is -1 */
 936                         device = SNDRV_RAWMIDI_DEVICES - 1;
 937                 mutex_lock(&register_mutex);
 938                 device = device < 0 ? 0 : device + 1;
 939                 while (device < SNDRV_RAWMIDI_DEVICES) {
 940                         if (snd_rawmidi_search(card, device))
 941                                 break;
 942                         device++;
 943                 }
 944                 if (device == SNDRV_RAWMIDI_DEVICES)
 945                         device = -1;
 946                 mutex_unlock(&register_mutex);
 947                 if (put_user(device, (int __user *)argp))
 948                         return -EFAULT;
 949                 return 0;
 950         }
 951         case SNDRV_CTL_IOCTL_RAWMIDI_PREFER_SUBDEVICE:
 952         {
 953                 int val;
 954
 955                 if (get_user(val, (int __user *)argp))
 956                         return -EFAULT;
 957                 control->preferred_subdevice[SND_CTL_SUBDEV_RAWMIDI] = val;
 958                 return 0;
 959         }
 960         case SNDRV_CTL_IOCTL_RAWMIDI_INFO:
 961                 return snd_rawmidi_info_select_user(card, argp);
 962         }
 963         return -ENOIOCTLCMD;
 964 }
 965
 966 /**
 967  * snd_rawmidi_receive - receive the input data from the device
 968  * @substream: the rawmidi substream
 969  * @buffer: the buffer pointer
 970  * @count: the data size to read
 971  *
 972  * Reads the data from the internal buffer.
 973  *
 974  * Return: The size of read data, or a negative error code on failure.
 975  */
 976 int snd_rawmidi_receive(struct snd_rawmidi_substream *substream,
 977                         const unsigned char *buffer, int count)
 978 {
 979         unsigned long flags;
 980         int result = 0, count1;
 981         struct snd_rawmidi_runtime *runtime = substream->runtime;
 982
 983         if (!substream->opened)
 984                 return -EBADFD;
 985         if (runtime->buffer == NULL) {
 986                 rmidi_dbg(substream->rmidi,
 987                           "snd_rawmidi_receive: input is not active!!!\n");
 988                 return -EINVAL;
 989         }
 990         spin_lock_irqsave(&runtime->lock, flags);
 991         if (count == 1) {       /* special case, faster code */
 992                 substream->bytes++;
 993                 if (runtime->avail < runtime->buffer_size) {
 994                         runtime->buffer[runtime->hw_ptr++] = buffer[0];
 995                         runtime->hw_ptr %= runtime->buffer_size;
 996                         runtime->avail++;
 997                         result++;
 998                 } else {
 999                         runtime->xruns++;
1000                 }
1001         } else {
1002                 substream->bytes += count;
1003                 count1 = runtime->buffer_size - runtime->hw_ptr;
1004                 if (count1 > count)
1005                         count1 = count;
1006                 if (count1 > (int)(runtime->buffer_size - runtime->avail))
1007                         count1 = runtime->buffer_size - runtime->avail;
1008                 memcpy(runtime->buffer + runtime->hw_ptr, buffer, count1);
1009                 runtime->hw_ptr += count1;
1010                 runtime->hw_ptr %= runtime->buffer_size;
1011                 runtime->avail += count1;
1012                 count -= count1;
1013                 result += count1;
1014                 if (count > 0) {
1015                         buffer += count1;
1016                         count1 = count;
1017                         if (count1 > (int)(runtime->buffer_size - runtime->avail)) {
1018                                 count1 = runtime->buffer_size - runtime->avail;
1019                                 runtime->xruns += count - count1;
1020                         }
1021                         if (count1 > 0) {
1022                                 memcpy(runtime->buffer, buffer, count1);
1023                                 runtime->hw_ptr = count1;
1024                                 runtime->avail += count1;
1025                                 result += count1;
1026                         }
1027                 }
1028         }
1029         if (result > 0) {
1030                 if (runtime->event)
1031                         schedule_work(&runtime->event_work);
1032                 else if (__snd_rawmidi_ready(runtime))
1033                         wake_up(&runtime->sleep);
1034         }
1035         spin_unlock_irqrestore(&runtime->lock, flags);
1036         return result;
1037 }
1038 EXPORT_SYMBOL(snd_rawmidi_receive);
1039
1040 static long snd_rawmidi_kernel_read1(struct snd_rawmidi_substream *substream,
1041                                      unsigned char __user *userbuf,
1042                                      unsigned char *kernelbuf, long count)
1043 {
1044         unsigned long flags;
1045         long result = 0, count1;
1046         struct snd_rawmidi_runtime *runtime = substream->runtime;
1047         unsigned long appl_ptr;
1048         int err = 0;
1049
1050         spin_lock_irqsave(&runtime->lock, flags);
1051         snd_rawmidi_buffer_ref(runtime);
1052         while (count > 0 && runtime->avail) {
1053                 count1 = runtime->buffer_size - runtime->appl_ptr;
1054                 if (count1 > count)
1055                         count1 = count;
1056                 if (count1 > (int)runtime->avail)
1057                         count1 = runtime->avail;
1058
1059                 /* update runtime->appl_ptr before unlocking for userbuf */
1060                 appl_ptr = runtime->appl_ptr;
1061                 runtime->appl_ptr += count1;
1062                 runtime->appl_ptr %= runtime->buffer_size;
1063                 runtime->avail -= count1;
1064
1065                 if (kernelbuf)
1066                         memcpy(kernelbuf + result, runtime->buffer + appl_ptr, count1);
1067                 if (userbuf) {
1068                         spin_unlock_irqrestore(&runtime->lock, flags);
1069                         if (copy_to_user(userbuf + result,
1070                                          runtime->buffer + appl_ptr, count1))
1071                                 err = -EFAULT;
1072                         spin_lock_irqsave(&runtime->lock, flags);
1073                         if (err)
1074                                 goto out;
1075                 }
1076                 result += count1;
1077                 count -= count1;
1078         }
1079  out:
1080         snd_rawmidi_buffer_unref(runtime);
1081         spin_unlock_irqrestore(&runtime->lock, flags);
1082         return result > 0 ? result : err;
1083 }
1084
1085 long snd_rawmidi_kernel_read(struct snd_rawmidi_substream *substream,
1086                              unsigned char *buf, long count)
1087 {
1088         snd_rawmidi_input_trigger(substream, 1);
1089         return snd_rawmidi_kernel_read1(substream, NULL/*userbuf*/, buf, count);
1090 }
1091 EXPORT_SYMBOL(snd_rawmidi_kernel_read);
1092
1093 static ssize_t snd_rawmidi_read(struct file *file, char __user *buf, size_t count,
1094                                 loff_t *offset)
1095 {
1096         long result;
1097         int count1;
1098         struct snd_rawmidi_file *rfile;
1099         struct snd_rawmidi_substream *substream;
1100         struct snd_rawmidi_runtime *runtime;
1101
1102         rfile = file->private_data;
1103         substream = rfile->input;
1104         if (substream == NULL)
1105                 return -EIO;
1106         runtime = substream->runtime;
1107         snd_rawmidi_input_trigger(substream, 1);
1108         result = 0;
1109         while (count > 0) {
1110                 spin_lock_irq(&runtime->lock);
1111                 while (!__snd_rawmidi_ready(runtime)) {
1112                         wait_queue_entry_t wait;
1113
1114                         if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1115                                 spin_unlock_irq(&runtime->lock);
1116                                 return result > 0 ? result : -EAGAIN;
1117                         }
1118                         init_waitqueue_entry(&wait, current);
1119                         add_wait_queue(&runtime->sleep, &wait);
1120                         set_current_state(TASK_INTERRUPTIBLE);
1121                         spin_unlock_irq(&runtime->lock);
1122                         schedule();
1123                         remove_wait_queue(&runtime->sleep, &wait);
1124                         if (rfile->rmidi->card->shutdown)
1125                                 return -ENODEV;
1126                         if (signal_pending(current))
1127                                 return result > 0 ? result : -ERESTARTSYS;
1128                         spin_lock_irq(&runtime->lock);
1129                         if (!runtime->avail) {
1130                                 spin_unlock_irq(&runtime->lock);
1131                                 return result > 0 ? result : -EIO;
1132                         }
1133                 }
1134                 spin_unlock_irq(&runtime->lock);
1135                 count1 = snd_rawmidi_kernel_read1(substream,
1136                                                   (unsigned char __user *)buf,
1137                                                   NULL/*kernelbuf*/,
1138                                                   count);
1139                 if (count1 < 0)
1140                         return result > 0 ? result : count1;
1141                 result += count1;
1142                 buf += count1;
1143                 count -= count1;
1144         }
1145         return result;
1146 }
1147
1148 /**
1149  * snd_rawmidi_transmit_empty - check whether the output buffer is empty
1150  * @substream: the rawmidi substream
1151  *
1152  * Return: 1 if the internal output buffer is empty, 0 if not.
1153  */
1154 int snd_rawmidi_transmit_empty(struct snd_rawmidi_substream *substream)
1155 {
1156         struct snd_rawmidi_runtime *runtime = substream->runtime;
1157         int result;
1158         unsigned long flags;
1159
1160         if (runtime->buffer == NULL) {
1161                 rmidi_dbg(substream->rmidi,
1162                           "snd_rawmidi_transmit_empty: output is not active!!!\n");
1163                 return 1;
1164         }
1165         spin_lock_irqsave(&runtime->lock, flags);
1166         result = runtime->avail >= runtime->buffer_size;
1167         spin_unlock_irqrestore(&runtime->lock, flags);
1168         return result;
1169 }
1170 EXPORT_SYMBOL(snd_rawmidi_transmit_empty);
1171
1172 /**
1173  * __snd_rawmidi_transmit_peek - copy data from the internal buffer
1174  * @substream: the rawmidi substream
1175  * @buffer: the buffer pointer
1176  * @count: data size to transfer
1177  *
1178  * This is a variant of snd_rawmidi_transmit_peek() without spinlock.
1179  */
1180 int __snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
1181                               unsigned char *buffer, int count)
1182 {
1183         int result, count1;
1184         struct snd_rawmidi_runtime *runtime = substream->runtime;
1185
1186         if (runtime->buffer == NULL) {
1187                 rmidi_dbg(substream->rmidi,
1188                           "snd_rawmidi_transmit_peek: output is not active!!!\n");
1189                 return -EINVAL;
1190         }
1191         result = 0;
1192         if (runtime->avail >= runtime->buffer_size) {
1193                 /* warning: lowlevel layer MUST trigger down the hardware */
1194                 goto __skip;
1195         }
1196         if (count == 1) {       /* special case, faster code */
1197                 *buffer = runtime->buffer[runtime->hw_ptr];
1198                 result++;
1199         } else {
1200                 count1 = runtime->buffer_size - runtime->hw_ptr;
1201                 if (count1 > count)
1202                         count1 = count;
1203                 if (count1 > (int)(runtime->buffer_size - runtime->avail))
1204                         count1 = runtime->buffer_size - runtime->avail;
1205                 memcpy(buffer, runtime->buffer + runtime->hw_ptr, count1);
1206                 count -= count1;
1207                 result += count1;
1208                 if (count > 0) {
1209                         if (count > (int)(runtime->buffer_size - runtime->avail - count1))
1210                                 count = runtime->buffer_size - runtime->avail - count1;
1211                         memcpy(buffer + count1, runtime->buffer, count);
1212                         result += count;
1213                 }
1214         }
1215       __skip:
1216         return result;
1217 }
1218 EXPORT_SYMBOL(__snd_rawmidi_transmit_peek);
1219
1220 /**
1221  * snd_rawmidi_transmit_peek - copy data from the internal buffer
1222  * @substream: the rawmidi substream
1223  * @buffer: the buffer pointer
1224  * @count: data size to transfer
1225  *
1226  * Copies data from the internal output buffer to the given buffer.
1227  *
1228  * Call this in the interrupt handler when the midi output is ready,
1229  * and call snd_rawmidi_transmit_ack() after the transmission is
1230  * finished.
1231  *
1232  * Return: The size of copied data, or a negative error code on failure.
1233  */
1234 int snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
1235                               unsigned char *buffer, int count)
1236 {
1237         struct snd_rawmidi_runtime *runtime = substream->runtime;
1238         int result;
1239         unsigned long flags;
1240
1241         spin_lock_irqsave(&runtime->lock, flags);
1242         result = __snd_rawmidi_transmit_peek(substream, buffer, count);
1243         spin_unlock_irqrestore(&runtime->lock, flags);
1244         return result;
1245 }
1246 EXPORT_SYMBOL(snd_rawmidi_transmit_peek);
1247
1248 /**
1249  * __snd_rawmidi_transmit_ack - acknowledge the transmission
1250  * @substream: the rawmidi substream
1251  * @count: the transferred count
1252  *
1253  * This is a variant of __snd_rawmidi_transmit_ack() without spinlock.
1254  */
1255 int __snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count)
1256 {
1257         struct snd_rawmidi_runtime *runtime = substream->runtime;
1258
1259         if (runtime->buffer == NULL) {
1260                 rmidi_dbg(substream->rmidi,
1261                           "snd_rawmidi_transmit_ack: output is not active!!!\n");
1262                 return -EINVAL;
1263         }
1264         snd_BUG_ON(runtime->avail + count > runtime->buffer_size);
1265         runtime->hw_ptr += count;
1266         runtime->hw_ptr %= runtime->buffer_size;
1267         runtime->avail += count;
1268         substream->bytes += count;
1269         if (count > 0) {
1270                 if (runtime->drain || __snd_rawmidi_ready(runtime))
1271                         wake_up(&runtime->sleep);
1272         }
1273         return count;
1274 }
1275 EXPORT_SYMBOL(__snd_rawmidi_transmit_ack);
1276
1277 /**
1278  * snd_rawmidi_transmit_ack - acknowledge the transmission
1279  * @substream: the rawmidi substream
1280  * @count: the transferred count
1281  *
1282  * Advances the hardware pointer for the internal output buffer with
1283  * the given size and updates the condition.
1284  * Call after the transmission is finished.
1285  *
1286  * Return: The advanced size if successful, or a negative error code on failure.
1287  */
1288 int snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count)
1289 {
1290         struct snd_rawmidi_runtime *runtime = substream->runtime;
1291         int result;
1292         unsigned long flags;
1293
1294         spin_lock_irqsave(&runtime->lock, flags);
1295         result = __snd_rawmidi_transmit_ack(substream, count);
1296         spin_unlock_irqrestore(&runtime->lock, flags);
1297         return result;
1298 }
1299 EXPORT_SYMBOL(snd_rawmidi_transmit_ack);
1300
1301 /**
1302  * snd_rawmidi_transmit - copy from the buffer to the device
1303  * @substream: the rawmidi substream
1304  * @buffer: the buffer pointer
1305  * @count: the data size to transfer
1306  *
1307  * Copies data from the buffer to the device and advances the pointer.
1308  *
1309  * Return: The copied size if successful, or a negative error code on failure.
1310  */
1311 int snd_rawmidi_transmit(struct snd_rawmidi_substream *substream,
1312                          unsigned char *buffer, int count)
1313 {
1314         struct snd_rawmidi_runtime *runtime = substream->runtime;
1315         int result;
1316         unsigned long flags;
1317
1318         spin_lock_irqsave(&runtime->lock, flags);
1319         if (!substream->opened)
1320                 result = -EBADFD;
1321         else {
1322                 count = __snd_rawmidi_transmit_peek(substream, buffer, count);
1323                 if (count <= 0)
1324                         result = count;
1325                 else
1326                         result = __snd_rawmidi_transmit_ack(substream, count);
1327         }
1328         spin_unlock_irqrestore(&runtime->lock, flags);
1329         return result;
1330 }
1331 EXPORT_SYMBOL(snd_rawmidi_transmit);
1332
1333 /**
1334  * snd_rawmidi_proceed - Discard the all pending bytes and proceed
1335  * @substream: rawmidi substream
1336  *
1337  * Return: the number of discarded bytes
1338  */
1339 int snd_rawmidi_proceed(struct snd_rawmidi_substream *substream)
1340 {
1341         struct snd_rawmidi_runtime *runtime = substream->runtime;
1342         unsigned long flags;
1343         int count = 0;
1344
1345         spin_lock_irqsave(&runtime->lock, flags);
1346         if (runtime->avail < runtime->buffer_size) {
1347                 count = runtime->buffer_size - runtime->avail;
1348                 __snd_rawmidi_transmit_ack(substream, count);
1349         }
1350         spin_unlock_irqrestore(&runtime->lock, flags);
1351         return count;
1352 }
1353 EXPORT_SYMBOL(snd_rawmidi_proceed);
1354
1355 static long snd_rawmidi_kernel_write1(struct snd_rawmidi_substream *substream,
1356                                       const unsigned char __user *userbuf,
1357                                       const unsigned char *kernelbuf,
1358                                       long count)
1359 {
1360         unsigned long flags;
1361         long count1, result;
1362         struct snd_rawmidi_runtime *runtime = substream->runtime;
1363         unsigned long appl_ptr;
1364
1365         if (!kernelbuf && !userbuf)
1366                 return -EINVAL;
1367         if (snd_BUG_ON(!runtime->buffer))
1368                 return -EINVAL;
1369
1370         result = 0;
1371         spin_lock_irqsave(&runtime->lock, flags);
1372         if (substream->append) {
1373                 if ((long)runtime->avail < count) {
1374                         spin_unlock_irqrestore(&runtime->lock, flags);
1375                         return -EAGAIN;
1376                 }
1377         }
1378         snd_rawmidi_buffer_ref(runtime);
1379         while (count > 0 && runtime->avail > 0) {
1380                 count1 = runtime->buffer_size - runtime->appl_ptr;
1381                 if (count1 > count)
1382                         count1 = count;
1383                 if (count1 > (long)runtime->avail)
1384                         count1 = runtime->avail;
1385
1386                 /* update runtime->appl_ptr before unlocking for userbuf */
1387                 appl_ptr = runtime->appl_ptr;
1388                 runtime->appl_ptr += count1;
1389                 runtime->appl_ptr %= runtime->buffer_size;
1390                 runtime->avail -= count1;
1391
1392                 if (kernelbuf)
1393                         memcpy(runtime->buffer + appl_ptr,
1394                                kernelbuf + result, count1);
1395                 else if (userbuf) {
1396                         spin_unlock_irqrestore(&runtime->lock, flags);
1397                         if (copy_from_user(runtime->buffer + appl_ptr,
1398                                            userbuf + result, count1)) {
1399                                 spin_lock_irqsave(&runtime->lock, flags);
1400                                 result = result > 0 ? result : -EFAULT;
1401                                 goto __end;
1402                         }
1403                         spin_lock_irqsave(&runtime->lock, flags);
1404                 }
1405                 result += count1;
1406                 count -= count1;
1407         }
1408       __end:
1409         count1 = runtime->avail < runtime->buffer_size;
1410         snd_rawmidi_buffer_unref(runtime);
1411         spin_unlock_irqrestore(&runtime->lock, flags);
1412         if (count1)
1413                 snd_rawmidi_output_trigger(substream, 1);
1414         return result;
1415 }
1416
1417 long snd_rawmidi_kernel_write(struct snd_rawmidi_substream *substream,
1418                               const unsigned char *buf, long count)
1419 {
1420         return snd_rawmidi_kernel_write1(substream, NULL, buf, count);
1421 }
1422 EXPORT_SYMBOL(snd_rawmidi_kernel_write);
1423
1424 static ssize_t snd_rawmidi_write(struct file *file, const char __user *buf,
1425                                  size_t count, loff_t *offset)
1426 {
1427         long result, timeout;
1428         int count1;
1429         struct snd_rawmidi_file *rfile;
1430         struct snd_rawmidi_runtime *runtime;
1431         struct snd_rawmidi_substream *substream;
1432
1433         rfile = file->private_data;
1434         substream = rfile->output;
1435         runtime = substream->runtime;
1436         /* we cannot put an atomic message to our buffer */
1437         if (substream->append && count > runtime->buffer_size)
1438                 return -EIO;
1439         result = 0;
1440         while (count > 0) {
1441                 spin_lock_irq(&runtime->lock);
1442                 while (!snd_rawmidi_ready_append(substream, count)) {
1443                         wait_queue_entry_t wait;
1444
1445                         if (file->f_flags & O_NONBLOCK) {
1446                                 spin_unlock_irq(&runtime->lock);
1447                                 return result > 0 ? result : -EAGAIN;
1448                         }
1449                         init_waitqueue_entry(&wait, current);
1450                         add_wait_queue(&runtime->sleep, &wait);
1451                         set_current_state(TASK_INTERRUPTIBLE);
1452                         spin_unlock_irq(&runtime->lock);
1453                         timeout = schedule_timeout(30 * HZ);
1454                         remove_wait_queue(&runtime->sleep, &wait);
1455                         if (rfile->rmidi->card->shutdown)
1456                                 return -ENODEV;
1457                         if (signal_pending(current))
1458                                 return result > 0 ? result : -ERESTARTSYS;
1459                         spin_lock_irq(&runtime->lock);
1460                         if (!runtime->avail && !timeout) {
1461                                 spin_unlock_irq(&runtime->lock);
1462                                 return result > 0 ? result : -EIO;
1463                         }
1464                 }
1465                 spin_unlock_irq(&runtime->lock);
1466                 count1 = snd_rawmidi_kernel_write1(substream, buf, NULL, count);
1467                 if (count1 < 0)
1468                         return result > 0 ? result : count1;
1469                 result += count1;
1470                 buf += count1;
1471                 if ((size_t)count1 < count && (file->f_flags & O_NONBLOCK))
1472                         break;
1473                 count -= count1;
1474         }
1475         if (file->f_flags & O_DSYNC) {
1476                 spin_lock_irq(&runtime->lock);
1477                 while (runtime->avail != runtime->buffer_size) {
1478                         wait_queue_entry_t wait;
1479                         unsigned int last_avail = runtime->avail;
1480
1481                         init_waitqueue_entry(&wait, current);
1482                         add_wait_queue(&runtime->sleep, &wait);
1483                         set_current_state(TASK_INTERRUPTIBLE);
1484                         spin_unlock_irq(&runtime->lock);
1485                         timeout = schedule_timeout(30 * HZ);
1486                         remove_wait_queue(&runtime->sleep, &wait);
1487                         if (signal_pending(current))
1488                                 return result > 0 ? result : -ERESTARTSYS;
1489                         if (runtime->avail == last_avail && !timeout)
1490                                 return result > 0 ? result : -EIO;
1491                         spin_lock_irq(&runtime->lock);
1492                 }
1493                 spin_unlock_irq(&runtime->lock);
1494         }
1495         return result;
1496 }
1497
1498 static __poll_t snd_rawmidi_poll(struct file *file, poll_table *wait)
1499 {
1500         struct snd_rawmidi_file *rfile;
1501         struct snd_rawmidi_runtime *runtime;
1502         __poll_t mask;
1503
1504         rfile = file->private_data;
1505         if (rfile->input != NULL) {
1506                 runtime = rfile->input->runtime;
1507                 snd_rawmidi_input_trigger(rfile->input, 1);
1508                 poll_wait(file, &runtime->sleep, wait);
1509         }
1510         if (rfile->output != NULL) {
1511                 runtime = rfile->output->runtime;
1512                 poll_wait(file, &runtime->sleep, wait);
1513         }
1514         mask = 0;
1515         if (rfile->input != NULL) {
1516                 if (snd_rawmidi_ready(rfile->input))
1517                         mask |= EPOLLIN | EPOLLRDNORM;
1518         }
1519         if (rfile->output != NULL) {
1520                 if (snd_rawmidi_ready(rfile->output))
1521                         mask |= EPOLLOUT | EPOLLWRNORM;
1522         }
1523         return mask;
1524 }
1525
1526 /*
1527  */
1528 #ifdef CONFIG_COMPAT
1529 #include "rawmidi_compat.c"
1530 #else
1531 #define snd_rawmidi_ioctl_compat        NULL
1532 #endif
1533
1534 /*
1535  */
1536
1537 static void snd_rawmidi_proc_info_read(struct snd_info_entry *entry,
1538                                        struct snd_info_buffer *buffer)
1539 {
1540         struct snd_rawmidi *rmidi;
1541         struct snd_rawmidi_substream *substream;
1542         struct snd_rawmidi_runtime *runtime;
1543         unsigned long buffer_size, avail, xruns;
1544
1545         rmidi = entry->private_data;
1546         snd_iprintf(buffer, "%s\n\n", rmidi->name);
1547         mutex_lock(&rmidi->open_mutex);
1548         if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_OUTPUT) {
1549                 list_for_each_entry(substream,
1550                                     &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams,
1551                                     list) {
1552                         snd_iprintf(buffer,
1553                                     "Output %d\n"
1554                                     "  Tx bytes     : %lu\n",
1555                                     substream->number,
1556                                     (unsigned long) substream->bytes);
1557                         if (substream->opened) {
1558                                 snd_iprintf(buffer,
1559                                     "  Owner PID    : %d\n",
1560                                     pid_vnr(substream->pid));
1561                                 runtime = substream->runtime;
1562                                 spin_lock_irq(&runtime->lock);
1563                                 buffer_size = runtime->buffer_size;
1564                                 avail = runtime->avail;
1565                                 spin_unlock_irq(&runtime->lock);
1566                                 snd_iprintf(buffer,
1567                                     "  Mode         : %s\n"
1568                                     "  Buffer size  : %lu\n"
1569                                     "  Avail        : %lu\n",
1570                                     runtime->oss ? "OSS compatible" : "native",
1571                                     buffer_size, avail);
1572                         }
1573                 }
1574         }
1575         if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_INPUT) {
1576                 list_for_each_entry(substream,
1577                                     &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams,
1578                                     list) {
1579                         snd_iprintf(buffer,
1580                                     "Input %d\n"
1581                                     "  Rx bytes     : %lu\n",
1582                                     substream->number,
1583                                     (unsigned long) substream->bytes);
1584                         if (substream->opened) {
1585                                 snd_iprintf(buffer,
1586                                             "  Owner PID    : %d\n",
1587                                             pid_vnr(substream->pid));
1588                                 runtime = substream->runtime;
1589                                 spin_lock_irq(&runtime->lock);
1590                                 buffer_size = runtime->buffer_size;
1591                                 avail = runtime->avail;
1592                                 xruns = runtime->xruns;
1593                                 spin_unlock_irq(&runtime->lock);
1594                                 snd_iprintf(buffer,
1595                                             "  Buffer size  : %lu\n"
1596                                             "  Avail        : %lu\n"
1597                                             "  Overruns     : %lu\n",
1598                                             buffer_size, avail, xruns);
1599                         }
1600                 }
1601         }
1602         mutex_unlock(&rmidi->open_mutex);
1603 }
1604
1605 /*
1606  *  Register functions
1607  */
1608
1609 static const struct file_operations snd_rawmidi_f_ops = {
1610         .owner =        THIS_MODULE,
1611         .read =         snd_rawmidi_read,
1612         .write =        snd_rawmidi_write,
1613         .open =         snd_rawmidi_open,
1614         .release =      snd_rawmidi_release,
1615         .llseek =       no_llseek,
1616         .poll =         snd_rawmidi_poll,
1617         .unlocked_ioctl =       snd_rawmidi_ioctl,
1618         .compat_ioctl = snd_rawmidi_ioctl_compat,
1619 };
1620
1621 static int snd_rawmidi_alloc_substreams(struct snd_rawmidi *rmidi,
1622                                         struct snd_rawmidi_str *stream,
1623                                         int direction,
1624                                         int count)
1625 {
1626         struct snd_rawmidi_substream *substream;
1627         int idx;
1628
1629         for (idx = 0; idx < count; idx++) {
1630                 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
1631                 if (!substream)
1632                         return -ENOMEM;
1633                 substream->stream = direction;
1634                 substream->number = idx;
1635                 substream->rmidi = rmidi;
1636                 substream->pstr = stream;
1637                 list_add_tail(&substream->list, &stream->substreams);
1638                 stream->substream_count++;
1639         }
1640         return 0;
1641 }
1642
1643 static void release_rawmidi_device(struct device *dev)
1644 {
1645         kfree(container_of(dev, struct snd_rawmidi, dev));
1646 }
1647
1648 /**
1649  * snd_rawmidi_new - create a rawmidi instance
1650  * @card: the card instance
1651  * @id: the id string
1652  * @device: the device index
1653  * @output_count: the number of output streams
1654  * @input_count: the number of input streams
1655  * @rrawmidi: the pointer to store the new rawmidi instance
1656  *
1657  * Creates a new rawmidi instance.
1658  * Use snd_rawmidi_set_ops() to set the operators to the new instance.
1659  *
1660  * Return: Zero if successful, or a negative error code on failure.
1661  */
1662 int snd_rawmidi_new(struct snd_card *card, char *id, int device,
1663                     int output_count, int input_count,
1664                     struct snd_rawmidi **rrawmidi)
1665 {
1666         struct snd_rawmidi *rmidi;
1667         int err;
1668         static const struct snd_device_ops ops = {
1669                 .dev_free = snd_rawmidi_dev_free,
1670                 .dev_register = snd_rawmidi_dev_register,
1671                 .dev_disconnect = snd_rawmidi_dev_disconnect,
1672         };
1673
1674         if (snd_BUG_ON(!card))
1675                 return -ENXIO;
1676         if (rrawmidi)
1677                 *rrawmidi = NULL;
1678         rmidi = kzalloc(sizeof(*rmidi), GFP_KERNEL);
1679         if (!rmidi)
1680                 return -ENOMEM;
1681         rmidi->card = card;
1682         rmidi->device = device;
1683         mutex_init(&rmidi->open_mutex);
1684         init_waitqueue_head(&rmidi->open_wait);
1685         INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams);
1686         INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams);
1687
1688         if (id != NULL)
1689                 strscpy(rmidi->id, id, sizeof(rmidi->id));
1690
1691         snd_device_initialize(&rmidi->dev, card);
1692         rmidi->dev.release = release_rawmidi_device;
1693         dev_set_name(&rmidi->dev, "midiC%iD%i", card->number, device);
1694
1695         err = snd_rawmidi_alloc_substreams(rmidi,
1696                                            &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT],
1697                                            SNDRV_RAWMIDI_STREAM_INPUT,
1698                                            input_count);
1699         if (err < 0)
1700                 goto error;
1701         err = snd_rawmidi_alloc_substreams(rmidi,
1702                                            &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT],
1703                                            SNDRV_RAWMIDI_STREAM_OUTPUT,
1704                                            output_count);
1705         if (err < 0)
1706                 goto error;
1707         err = snd_device_new(card, SNDRV_DEV_RAWMIDI, rmidi, &ops);
1708         if (err < 0)
1709                 goto error;
1710
1711         if (rrawmidi)
1712                 *rrawmidi = rmidi;
1713         return 0;
1714
1715  error:
1716         snd_rawmidi_free(rmidi);
1717         return err;
1718 }
1719 EXPORT_SYMBOL(snd_rawmidi_new);
1720
1721 static void snd_rawmidi_free_substreams(struct snd_rawmidi_str *stream)
1722 {
1723         struct snd_rawmidi_substream *substream;
1724
1725         while (!list_empty(&stream->substreams)) {
1726                 substream = list_entry(stream->substreams.next, struct snd_rawmidi_substream, list);
1727                 list_del(&substream->list);
1728                 kfree(substream);
1729         }
1730 }
1731
1732 static int snd_rawmidi_free(struct snd_rawmidi *rmidi)
1733 {
1734         if (!rmidi)
1735                 return 0;
1736
1737         snd_info_free_entry(rmidi->proc_entry);
1738         rmidi->proc_entry = NULL;
1739         mutex_lock(&register_mutex);
1740         if (rmidi->ops && rmidi->ops->dev_unregister)
1741                 rmidi->ops->dev_unregister(rmidi);
1742         mutex_unlock(&register_mutex);
1743
1744         snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT]);
1745         snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT]);
1746         if (rmidi->private_free)
1747                 rmidi->private_free(rmidi);
1748         put_device(&rmidi->dev);
1749         return 0;
1750 }
1751
1752 static int snd_rawmidi_dev_free(struct snd_device *device)
1753 {
1754         struct snd_rawmidi *rmidi = device->device_data;
1755
1756         return snd_rawmidi_free(rmidi);
1757 }
1758
1759 #if IS_ENABLED(CONFIG_SND_SEQUENCER)
1760 static void snd_rawmidi_dev_seq_free(struct snd_seq_device *device)
1761 {
1762         struct snd_rawmidi *rmidi = device->private_data;
1763
1764         rmidi->seq_dev = NULL;
1765 }
1766 #endif
1767
1768 static int snd_rawmidi_dev_register(struct snd_device *device)
1769 {
1770         int err;
1771         struct snd_info_entry *entry;
1772         char name[16];
1773         struct snd_rawmidi *rmidi = device->device_data;
1774
1775         if (rmidi->device >= SNDRV_RAWMIDI_DEVICES)
1776                 return -ENOMEM;
1777         err = 0;
1778         mutex_lock(&register_mutex);
1779         if (snd_rawmidi_search(rmidi->card, rmidi->device))
1780                 err = -EBUSY;
1781         else
1782                 list_add_tail(&rmidi->list, &snd_rawmidi_devices);
1783         mutex_unlock(&register_mutex);
1784         if (err < 0)
1785                 return err;
1786
1787         err = snd_register_device(SNDRV_DEVICE_TYPE_RAWMIDI,
1788                                   rmidi->card, rmidi->device,
1789                                   &snd_rawmidi_f_ops, rmidi, &rmidi->dev);
1790         if (err < 0) {
1791                 rmidi_err(rmidi, "unable to register\n");
1792                 goto error;
1793         }
1794         if (rmidi->ops && rmidi->ops->dev_register) {
1795                 err = rmidi->ops->dev_register(rmidi);
1796                 if (err < 0)
1797                         goto error_unregister;
1798         }
1799 #ifdef CONFIG_SND_OSSEMUL
1800         rmidi->ossreg = 0;
1801         if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1802                 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1803                                             rmidi->card, 0, &snd_rawmidi_f_ops,
1804                                             rmidi) < 0) {
1805                         rmidi_err(rmidi,
1806                                   "unable to register OSS rawmidi device %i:%i\n",
1807                                   rmidi->card->number, 0);
1808                 } else {
1809                         rmidi->ossreg++;
1810 #ifdef SNDRV_OSS_INFO_DEV_MIDI
1811                         snd_oss_info_register(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number, rmidi->name);
1812 #endif
1813                 }
1814         }
1815         if ((int)rmidi->device == amidi_map[rmidi->card->number]) {
1816                 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1817                                             rmidi->card, 1, &snd_rawmidi_f_ops,
1818                                             rmidi) < 0) {
1819                         rmidi_err(rmidi,
1820                                   "unable to register OSS rawmidi device %i:%i\n",
1821                                   rmidi->card->number, 1);
1822                 } else {
1823                         rmidi->ossreg++;
1824                 }
1825         }
1826 #endif /* CONFIG_SND_OSSEMUL */
1827         sprintf(name, "midi%d", rmidi->device);
1828         entry = snd_info_create_card_entry(rmidi->card, name, rmidi->card->proc_root);
1829         if (entry) {
1830                 entry->private_data = rmidi;
1831                 entry->c.text.read = snd_rawmidi_proc_info_read;
1832                 if (snd_info_register(entry) < 0) {
1833                         snd_info_free_entry(entry);
1834                         entry = NULL;
1835                 }
1836         }
1837         rmidi->proc_entry = entry;
1838 #if IS_ENABLED(CONFIG_SND_SEQUENCER)
1839         if (!rmidi->ops || !rmidi->ops->dev_register) { /* own registration mechanism */
1840                 if (snd_seq_device_new(rmidi->card, rmidi->device, SNDRV_SEQ_DEV_ID_MIDISYNTH, 0, &rmidi->seq_dev) >= 0) {
1841                         rmidi->seq_dev->private_data = rmidi;
1842                         rmidi->seq_dev->private_free = snd_rawmidi_dev_seq_free;
1843                         sprintf(rmidi->seq_dev->name, "MIDI %d-%d", rmidi->card->number, rmidi->device);
1844                         snd_device_register(rmidi->card, rmidi->seq_dev);
1845                 }
1846         }
1847 #endif
1848         return 0;
1849
1850  error_unregister:
1851         snd_unregister_device(&rmidi->dev);
1852  error:
1853         mutex_lock(&register_mutex);
1854         list_del(&rmidi->list);
1855         mutex_unlock(&register_mutex);
1856         return err;
1857 }
1858
1859 static int snd_rawmidi_dev_disconnect(struct snd_device *device)
1860 {
1861         struct snd_rawmidi *rmidi = device->device_data;
1862         int dir;
1863
1864         mutex_lock(&register_mutex);
1865         mutex_lock(&rmidi->open_mutex);
1866         wake_up(&rmidi->open_wait);
1867         list_del_init(&rmidi->list);
1868         for (dir = 0; dir < 2; dir++) {
1869                 struct snd_rawmidi_substream *s;
1870
1871                 list_for_each_entry(s, &rmidi->streams[dir].substreams, list) {
1872                         if (s->runtime)
1873                                 wake_up(&s->runtime->sleep);
1874                 }
1875         }
1876
1877 #ifdef CONFIG_SND_OSSEMUL
1878         if (rmidi->ossreg) {
1879                 if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1880                         snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 0);
1881 #ifdef SNDRV_OSS_INFO_DEV_MIDI
1882                         snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number);
1883 #endif
1884                 }
1885                 if ((int)rmidi->device == amidi_map[rmidi->card->number])
1886                         snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 1);
1887                 rmidi->ossreg = 0;
1888         }
1889 #endif /* CONFIG_SND_OSSEMUL */
1890         snd_unregister_device(&rmidi->dev);
1891         mutex_unlock(&rmidi->open_mutex);
1892         mutex_unlock(&register_mutex);
1893         return 0;
1894 }
1895
1896 /**
1897  * snd_rawmidi_set_ops - set the rawmidi operators
1898  * @rmidi: the rawmidi instance
1899  * @stream: the stream direction, SNDRV_RAWMIDI_STREAM_XXX
1900  * @ops: the operator table
1901  *
1902  * Sets the rawmidi operators for the given stream direction.
1903  */
1904 void snd_rawmidi_set_ops(struct snd_rawmidi *rmidi, int stream,
1905                          const struct snd_rawmidi_ops *ops)
1906 {
1907         struct snd_rawmidi_substream *substream;
1908
1909         list_for_each_entry(substream, &rmidi->streams[stream].substreams, list)
1910                 substream->ops = ops;
1911 }
1912 EXPORT_SYMBOL(snd_rawmidi_set_ops);
1913
1914 /*
1915  *  ENTRY functions
1916  */
1917
1918 static int __init alsa_rawmidi_init(void)
1919 {
1920
1921         snd_ctl_register_ioctl(snd_rawmidi_control_ioctl);
1922         snd_ctl_register_ioctl_compat(snd_rawmidi_control_ioctl);
1923 #ifdef CONFIG_SND_OSSEMUL
1924         { int i;
1925         /* check device map table */
1926         for (i = 0; i < SNDRV_CARDS; i++) {
1927                 if (midi_map[i] < 0 || midi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1928                         pr_err("ALSA: rawmidi: invalid midi_map[%d] = %d\n",
1929                                i, midi_map[i]);
1930                         midi_map[i] = 0;
1931                 }
1932                 if (amidi_map[i] < 0 || amidi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1933                         pr_err("ALSA: rawmidi: invalid amidi_map[%d] = %d\n",
1934                                i, amidi_map[i]);
1935                         amidi_map[i] = 1;
1936                 }
1937         }
1938         }
1939 #endif /* CONFIG_SND_OSSEMUL */
1940         return 0;
1941 }
1942
1943 static void __exit alsa_rawmidi_exit(void)
1944 {
1945         snd_ctl_unregister_ioctl(snd_rawmidi_control_ioctl);
1946         snd_ctl_unregister_ioctl_compat(snd_rawmidi_control_ioctl);
1947 }
1948
1949 module_init(alsa_rawmidi_init)
1950 module_exit(alsa_rawmidi_exit)