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 #include <sound/ump.h>
  25
  26 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
  27 MODULE_DESCRIPTION("Midlevel RawMidi code for ALSA.");
  28 MODULE_LICENSE("GPL");
  29
  30 #ifdef CONFIG_SND_OSSEMUL
  31 static int midi_map[SNDRV_CARDS];
  32 static int amidi_map[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS-1)] = 1};
  33 module_param_array(midi_map, int, NULL, 0444);
  34 MODULE_PARM_DESC(midi_map, "Raw MIDI device number assigned to 1st OSS device.");
  35 module_param_array(amidi_map, int, NULL, 0444);
  36 MODULE_PARM_DESC(amidi_map, "Raw MIDI device number assigned to 2nd OSS device.");
  37 #endif /* CONFIG_SND_OSSEMUL */
  38
  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 #define rawmidi_is_ump(rmidi) \
  77         (IS_ENABLED(CONFIG_SND_UMP) && ((rmidi)->info_flags & SNDRV_RAWMIDI_INFO_UMP))
  78
  79 static struct snd_rawmidi *snd_rawmidi_search(struct snd_card *card, int device)
  80 {
  81         struct snd_rawmidi *rawmidi;
  82
  83         list_for_each_entry(rawmidi, &snd_rawmidi_devices, list)
  84                 if (rawmidi->card == card && rawmidi->device == device)
  85                         return rawmidi;
  86         return NULL;
  87 }
  88
  89 static inline unsigned short snd_rawmidi_file_flags(struct file *file)
  90 {
  91         switch (file->f_mode & (FMODE_READ | FMODE_WRITE)) {
  92         case FMODE_WRITE:
  93                 return SNDRV_RAWMIDI_LFLG_OUTPUT;
  94         case FMODE_READ:
  95                 return SNDRV_RAWMIDI_LFLG_INPUT;
  96         default:
  97                 return SNDRV_RAWMIDI_LFLG_OPEN;
  98         }
  99 }
 100
 101 static inline bool __snd_rawmidi_ready(struct snd_rawmidi_runtime *runtime)
 102 {
 103         return runtime->avail >= runtime->avail_min;
 104 }
 105
 106 static bool snd_rawmidi_ready(struct snd_rawmidi_substream *substream)
 107 {
 108         unsigned long flags;
 109         bool ready;
 110
 111         spin_lock_irqsave(&substream->lock, flags);
 112         ready = __snd_rawmidi_ready(substream->runtime);
 113         spin_unlock_irqrestore(&substream->lock, flags);
 114         return ready;
 115 }
 116
 117 static inline int snd_rawmidi_ready_append(struct snd_rawmidi_substream *substream,
 118                                            size_t count)
 119 {
 120         struct snd_rawmidi_runtime *runtime = substream->runtime;
 121
 122         return runtime->avail >= runtime->avail_min &&
 123                (!substream->append || runtime->avail >= count);
 124 }
 125
 126 static void snd_rawmidi_input_event_work(struct work_struct *work)
 127 {
 128         struct snd_rawmidi_runtime *runtime =
 129                 container_of(work, struct snd_rawmidi_runtime, event_work);
 130
 131         if (runtime->event)
 132                 runtime->event(runtime->substream);
 133 }
 134
 135 /* buffer refcount management: call with substream->lock held */
 136 static inline void snd_rawmidi_buffer_ref(struct snd_rawmidi_runtime *runtime)
 137 {
 138         runtime->buffer_ref++;
 139 }
 140
 141 static inline void snd_rawmidi_buffer_unref(struct snd_rawmidi_runtime *runtime)
 142 {
 143         runtime->buffer_ref--;
 144 }
 145
 146 static void snd_rawmidi_buffer_ref_sync(struct snd_rawmidi_substream *substream)
 147 {
 148         int loop = HZ;
 149
 150         spin_lock_irq(&substream->lock);
 151         while (substream->runtime->buffer_ref) {
 152                 spin_unlock_irq(&substream->lock);
 153                 if (!--loop) {
 154                         rmidi_err(substream->rmidi, "Buffer ref sync timeout\n");
 155                         return;
 156                 }
 157                 schedule_timeout_uninterruptible(1);
 158                 spin_lock_irq(&substream->lock);
 159         }
 160         spin_unlock_irq(&substream->lock);
 161 }
 162
 163 static int snd_rawmidi_runtime_create(struct snd_rawmidi_substream *substream)
 164 {
 165         struct snd_rawmidi_runtime *runtime;
 166
 167         runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
 168         if (!runtime)
 169                 return -ENOMEM;
 170         runtime->substream = substream;
 171         init_waitqueue_head(&runtime->sleep);
 172         INIT_WORK(&runtime->event_work, snd_rawmidi_input_event_work);
 173         runtime->event = NULL;
 174         runtime->buffer_size = PAGE_SIZE;
 175         runtime->avail_min = 1;
 176         if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
 177                 runtime->avail = 0;
 178         else
 179                 runtime->avail = runtime->buffer_size;
 180         runtime->buffer = kvzalloc(runtime->buffer_size, GFP_KERNEL);
 181         if (!runtime->buffer) {
 182                 kfree(runtime);
 183                 return -ENOMEM;
 184         }
 185         runtime->appl_ptr = runtime->hw_ptr = 0;
 186         substream->runtime = runtime;
 187         if (rawmidi_is_ump(substream->rmidi))
 188                 runtime->align = 3;
 189         return 0;
 190 }
 191
 192 /* get the current alignment (either 0 or 3) */
 193 static inline int get_align(struct snd_rawmidi_runtime *runtime)
 194 {
 195         if (IS_ENABLED(CONFIG_SND_UMP))
 196                 return runtime->align;
 197         else
 198                 return 0;
 199 }
 200
 201 /* get the trimmed size with the current alignment */
 202 #define get_aligned_size(runtime, size) ((size) & ~get_align(runtime))
 203
 204 static int snd_rawmidi_runtime_free(struct snd_rawmidi_substream *substream)
 205 {
 206         struct snd_rawmidi_runtime *runtime = substream->runtime;
 207
 208         kvfree(runtime->buffer);
 209         kfree(runtime);
 210         substream->runtime = NULL;
 211         return 0;
 212 }
 213
 214 static inline void snd_rawmidi_output_trigger(struct snd_rawmidi_substream *substream, int up)
 215 {
 216         if (!substream->opened)
 217                 return;
 218         substream->ops->trigger(substream, up);
 219 }
 220
 221 static void snd_rawmidi_input_trigger(struct snd_rawmidi_substream *substream, int up)
 222 {
 223         if (!substream->opened)
 224                 return;
 225         substream->ops->trigger(substream, up);
 226         if (!up)
 227                 cancel_work_sync(&substream->runtime->event_work);
 228 }
 229
 230 static void __reset_runtime_ptrs(struct snd_rawmidi_runtime *runtime,
 231                                  bool is_input)
 232 {
 233         runtime->drain = 0;
 234         runtime->appl_ptr = runtime->hw_ptr = 0;
 235         runtime->avail = is_input ? 0 : runtime->buffer_size;
 236 }
 237
 238 static void reset_runtime_ptrs(struct snd_rawmidi_substream *substream,
 239                                bool is_input)
 240 {
 241         unsigned long flags;
 242
 243         spin_lock_irqsave(&substream->lock, flags);
 244         if (substream->opened && substream->runtime)
 245                 __reset_runtime_ptrs(substream->runtime, is_input);
 246         spin_unlock_irqrestore(&substream->lock, flags);
 247 }
 248
 249 int snd_rawmidi_drop_output(struct snd_rawmidi_substream *substream)
 250 {
 251         snd_rawmidi_output_trigger(substream, 0);
 252         reset_runtime_ptrs(substream, false);
 253         return 0;
 254 }
 255 EXPORT_SYMBOL(snd_rawmidi_drop_output);
 256
 257 int snd_rawmidi_drain_output(struct snd_rawmidi_substream *substream)
 258 {
 259         int err = 0;
 260         long timeout;
 261         struct snd_rawmidi_runtime *runtime;
 262
 263         spin_lock_irq(&substream->lock);
 264         runtime = substream->runtime;
 265         if (!substream->opened || !runtime || !runtime->buffer) {
 266                 err = -EINVAL;
 267         } else {
 268                 snd_rawmidi_buffer_ref(runtime);
 269                 runtime->drain = 1;
 270         }
 271         spin_unlock_irq(&substream->lock);
 272         if (err < 0)
 273                 return err;
 274
 275         timeout = wait_event_interruptible_timeout(runtime->sleep,
 276                                 (runtime->avail >= runtime->buffer_size),
 277                                 10*HZ);
 278
 279         spin_lock_irq(&substream->lock);
 280         if (signal_pending(current))
 281                 err = -ERESTARTSYS;
 282         if (runtime->avail < runtime->buffer_size && !timeout) {
 283                 rmidi_warn(substream->rmidi,
 284                            "rawmidi drain error (avail = %li, buffer_size = %li)\n",
 285                            (long)runtime->avail, (long)runtime->buffer_size);
 286                 err = -EIO;
 287         }
 288         runtime->drain = 0;
 289         spin_unlock_irq(&substream->lock);
 290
 291         if (err != -ERESTARTSYS) {
 292                 /* we need wait a while to make sure that Tx FIFOs are empty */
 293                 if (substream->ops->drain)
 294                         substream->ops->drain(substream);
 295                 else
 296                         msleep(50);
 297                 snd_rawmidi_drop_output(substream);
 298         }
 299
 300         spin_lock_irq(&substream->lock);
 301         snd_rawmidi_buffer_unref(runtime);
 302         spin_unlock_irq(&substream->lock);
 303
 304         return err;
 305 }
 306 EXPORT_SYMBOL(snd_rawmidi_drain_output);
 307
 308 int snd_rawmidi_drain_input(struct snd_rawmidi_substream *substream)
 309 {
 310         snd_rawmidi_input_trigger(substream, 0);
 311         reset_runtime_ptrs(substream, true);
 312         return 0;
 313 }
 314 EXPORT_SYMBOL(snd_rawmidi_drain_input);
 315
 316 /* look for an available substream for the given stream direction;
 317  * if a specific subdevice is given, try to assign it
 318  */
 319 static int assign_substream(struct snd_rawmidi *rmidi, int subdevice,
 320                             int stream, int mode,
 321                             struct snd_rawmidi_substream **sub_ret)
 322 {
 323         struct snd_rawmidi_substream *substream;
 324         struct snd_rawmidi_str *s = &rmidi->streams[stream];
 325         static const unsigned int info_flags[2] = {
 326                 [SNDRV_RAWMIDI_STREAM_OUTPUT] = SNDRV_RAWMIDI_INFO_OUTPUT,
 327                 [SNDRV_RAWMIDI_STREAM_INPUT] = SNDRV_RAWMIDI_INFO_INPUT,
 328         };
 329
 330         if (!(rmidi->info_flags & info_flags[stream]))
 331                 return -ENXIO;
 332         if (subdevice >= 0 && subdevice >= s->substream_count)
 333                 return -ENODEV;
 334
 335         list_for_each_entry(substream, &s->substreams, list) {
 336                 if (substream->opened) {
 337                         if (stream == SNDRV_RAWMIDI_STREAM_INPUT ||
 338                             !(mode & SNDRV_RAWMIDI_LFLG_APPEND) ||
 339                             !substream->append)
 340                                 continue;
 341                 }
 342                 if (subdevice < 0 || subdevice == substream->number) {
 343                         *sub_ret = substream;
 344                         return 0;
 345                 }
 346         }
 347         return -EAGAIN;
 348 }
 349
 350 /* open and do ref-counting for the given substream */
 351 static int open_substream(struct snd_rawmidi *rmidi,
 352                           struct snd_rawmidi_substream *substream,
 353                           int mode)
 354 {
 355         int err;
 356
 357         if (substream->use_count == 0) {
 358                 err = snd_rawmidi_runtime_create(substream);
 359                 if (err < 0)
 360                         return err;
 361                 err = substream->ops->open(substream);
 362                 if (err < 0) {
 363                         snd_rawmidi_runtime_free(substream);
 364                         return err;
 365                 }
 366                 spin_lock_irq(&substream->lock);
 367                 substream->opened = 1;
 368                 substream->active_sensing = 0;
 369                 if (mode & SNDRV_RAWMIDI_LFLG_APPEND)
 370                         substream->append = 1;
 371                 substream->pid = get_pid(task_pid(current));
 372                 rmidi->streams[substream->stream].substream_opened++;
 373                 spin_unlock_irq(&substream->lock);
 374         }
 375         substream->use_count++;
 376         return 0;
 377 }
 378
 379 static void close_substream(struct snd_rawmidi *rmidi,
 380                             struct snd_rawmidi_substream *substream,
 381                             int cleanup);
 382
 383 static int rawmidi_open_priv(struct snd_rawmidi *rmidi, int subdevice, int mode,
 384                              struct snd_rawmidi_file *rfile)
 385 {
 386         struct snd_rawmidi_substream *sinput = NULL, *soutput = NULL;
 387         int err;
 388
 389         rfile->input = rfile->output = NULL;
 390         if (mode & SNDRV_RAWMIDI_LFLG_INPUT) {
 391                 err = assign_substream(rmidi, subdevice,
 392                                        SNDRV_RAWMIDI_STREAM_INPUT,
 393                                        mode, &sinput);
 394                 if (err < 0)
 395                         return err;
 396         }
 397         if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) {
 398                 err = assign_substream(rmidi, subdevice,
 399                                        SNDRV_RAWMIDI_STREAM_OUTPUT,
 400                                        mode, &soutput);
 401                 if (err < 0)
 402                         return err;
 403         }
 404
 405         if (sinput) {
 406                 err = open_substream(rmidi, sinput, mode);
 407                 if (err < 0)
 408                         return err;
 409         }
 410         if (soutput) {
 411                 err = open_substream(rmidi, soutput, mode);
 412                 if (err < 0) {
 413                         if (sinput)
 414                                 close_substream(rmidi, sinput, 0);
 415                         return err;
 416                 }
 417         }
 418
 419         rfile->rmidi = rmidi;
 420         rfile->input = sinput;
 421         rfile->output = soutput;
 422         return 0;
 423 }
 424
 425 /* called from sound/core/seq/seq_midi.c */
 426 int snd_rawmidi_kernel_open(struct snd_rawmidi *rmidi, int subdevice,
 427                             int mode, struct snd_rawmidi_file *rfile)
 428 {
 429         int err;
 430
 431         if (snd_BUG_ON(!rfile))
 432                 return -EINVAL;
 433         if (!try_module_get(rmidi->card->module))
 434                 return -ENXIO;
 435
 436         mutex_lock(&rmidi->open_mutex);
 437         err = rawmidi_open_priv(rmidi, subdevice, mode, rfile);
 438         mutex_unlock(&rmidi->open_mutex);
 439         if (err < 0)
 440                 module_put(rmidi->card->module);
 441         return err;
 442 }
 443 EXPORT_SYMBOL(snd_rawmidi_kernel_open);
 444
 445 static int snd_rawmidi_open(struct inode *inode, struct file *file)
 446 {
 447         int maj = imajor(inode);
 448         struct snd_card *card;
 449         int subdevice;
 450         unsigned short fflags;
 451         int err;
 452         struct snd_rawmidi *rmidi;
 453         struct snd_rawmidi_file *rawmidi_file = NULL;
 454         wait_queue_entry_t wait;
 455
 456         if ((file->f_flags & O_APPEND) && !(file->f_flags & O_NONBLOCK))
 457                 return -EINVAL;         /* invalid combination */
 458
 459         err = stream_open(inode, file);
 460         if (err < 0)
 461                 return err;
 462
 463         if (maj == snd_major) {
 464                 rmidi = snd_lookup_minor_data(iminor(inode),
 465                                               SNDRV_DEVICE_TYPE_RAWMIDI);
 466 #ifdef CONFIG_SND_OSSEMUL
 467         } else if (maj == SOUND_MAJOR) {
 468                 rmidi = snd_lookup_oss_minor_data(iminor(inode),
 469                                                   SNDRV_OSS_DEVICE_TYPE_MIDI);
 470 #endif
 471         } else
 472                 return -ENXIO;
 473
 474         if (rmidi == NULL)
 475                 return -ENODEV;
 476
 477         if (!try_module_get(rmidi->card->module)) {
 478                 snd_card_unref(rmidi->card);
 479                 return -ENXIO;
 480         }
 481
 482         mutex_lock(&rmidi->open_mutex);
 483         card = rmidi->card;
 484         err = snd_card_file_add(card, file);
 485         if (err < 0)
 486                 goto __error_card;
 487         fflags = snd_rawmidi_file_flags(file);
 488         if ((file->f_flags & O_APPEND) || maj == SOUND_MAJOR) /* OSS emul? */
 489                 fflags |= SNDRV_RAWMIDI_LFLG_APPEND;
 490         rawmidi_file = kmalloc(sizeof(*rawmidi_file), GFP_KERNEL);
 491         if (rawmidi_file == NULL) {
 492                 err = -ENOMEM;
 493                 goto __error;
 494         }
 495         rawmidi_file->user_pversion = 0;
 496         init_waitqueue_entry(&wait, current);
 497         add_wait_queue(&rmidi->open_wait, &wait);
 498         while (1) {
 499                 subdevice = snd_ctl_get_preferred_subdevice(card, SND_CTL_SUBDEV_RAWMIDI);
 500                 err = rawmidi_open_priv(rmidi, subdevice, fflags, rawmidi_file);
 501                 if (err >= 0)
 502                         break;
 503                 if (err == -EAGAIN) {
 504                         if (file->f_flags & O_NONBLOCK) {
 505                                 err = -EBUSY;
 506                                 break;
 507                         }
 508                 } else
 509                         break;
 510                 set_current_state(TASK_INTERRUPTIBLE);
 511                 mutex_unlock(&rmidi->open_mutex);
 512                 schedule();
 513                 mutex_lock(&rmidi->open_mutex);
 514                 if (rmidi->card->shutdown) {
 515                         err = -ENODEV;
 516                         break;
 517                 }
 518                 if (signal_pending(current)) {
 519                         err = -ERESTARTSYS;
 520                         break;
 521                 }
 522         }
 523         remove_wait_queue(&rmidi->open_wait, &wait);
 524         if (err < 0) {
 525                 kfree(rawmidi_file);
 526                 goto __error;
 527         }
 528 #ifdef CONFIG_SND_OSSEMUL
 529         if (rawmidi_file->input && rawmidi_file->input->runtime)
 530                 rawmidi_file->input->runtime->oss = (maj == SOUND_MAJOR);
 531         if (rawmidi_file->output && rawmidi_file->output->runtime)
 532                 rawmidi_file->output->runtime->oss = (maj == SOUND_MAJOR);
 533 #endif
 534         file->private_data = rawmidi_file;
 535         mutex_unlock(&rmidi->open_mutex);
 536         snd_card_unref(rmidi->card);
 537         return 0;
 538
 539  __error:
 540         snd_card_file_remove(card, file);
 541  __error_card:
 542         mutex_unlock(&rmidi->open_mutex);
 543         module_put(rmidi->card->module);
 544         snd_card_unref(rmidi->card);
 545         return err;
 546 }
 547
 548 static void close_substream(struct snd_rawmidi *rmidi,
 549                             struct snd_rawmidi_substream *substream,
 550                             int cleanup)
 551 {
 552         if (--substream->use_count)
 553                 return;
 554
 555         if (cleanup) {
 556                 if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
 557                         snd_rawmidi_input_trigger(substream, 0);
 558                 else {
 559                         if (substream->active_sensing) {
 560                                 unsigned char buf = 0xfe;
 561                                 /* sending single active sensing message
 562                                  * to shut the device up
 563                                  */
 564                                 snd_rawmidi_kernel_write(substream, &buf, 1);
 565                         }
 566                         if (snd_rawmidi_drain_output(substream) == -ERESTARTSYS)
 567                                 snd_rawmidi_output_trigger(substream, 0);
 568                 }
 569                 snd_rawmidi_buffer_ref_sync(substream);
 570         }
 571         spin_lock_irq(&substream->lock);
 572         substream->opened = 0;
 573         substream->append = 0;
 574         spin_unlock_irq(&substream->lock);
 575         substream->ops->close(substream);
 576         if (substream->runtime->private_free)
 577                 substream->runtime->private_free(substream);
 578         snd_rawmidi_runtime_free(substream);
 579         put_pid(substream->pid);
 580         substream->pid = NULL;
 581         rmidi->streams[substream->stream].substream_opened--;
 582 }
 583
 584 static void rawmidi_release_priv(struct snd_rawmidi_file *rfile)
 585 {
 586         struct snd_rawmidi *rmidi;
 587
 588         rmidi = rfile->rmidi;
 589         mutex_lock(&rmidi->open_mutex);
 590         if (rfile->input) {
 591                 close_substream(rmidi, rfile->input, 1);
 592                 rfile->input = NULL;
 593         }
 594         if (rfile->output) {
 595                 close_substream(rmidi, rfile->output, 1);
 596                 rfile->output = NULL;
 597         }
 598         rfile->rmidi = NULL;
 599         mutex_unlock(&rmidi->open_mutex);
 600         wake_up(&rmidi->open_wait);
 601 }
 602
 603 /* called from sound/core/seq/seq_midi.c */
 604 int snd_rawmidi_kernel_release(struct snd_rawmidi_file *rfile)
 605 {
 606         struct snd_rawmidi *rmidi;
 607
 608         if (snd_BUG_ON(!rfile))
 609                 return -ENXIO;
 610
 611         rmidi = rfile->rmidi;
 612         rawmidi_release_priv(rfile);
 613         module_put(rmidi->card->module);
 614         return 0;
 615 }
 616 EXPORT_SYMBOL(snd_rawmidi_kernel_release);
 617
 618 static int snd_rawmidi_release(struct inode *inode, struct file *file)
 619 {
 620         struct snd_rawmidi_file *rfile;
 621         struct snd_rawmidi *rmidi;
 622         struct module *module;
 623
 624         rfile = file->private_data;
 625         rmidi = rfile->rmidi;
 626         rawmidi_release_priv(rfile);
 627         kfree(rfile);
 628         module = rmidi->card->module;
 629         snd_card_file_remove(rmidi->card, file);
 630         module_put(module);
 631         return 0;
 632 }
 633
 634 static int snd_rawmidi_info(struct snd_rawmidi_substream *substream,
 635                             struct snd_rawmidi_info *info)
 636 {
 637         struct snd_rawmidi *rmidi;
 638
 639         if (substream == NULL)
 640                 return -ENODEV;
 641         rmidi = substream->rmidi;
 642         memset(info, 0, sizeof(*info));
 643         info->card = rmidi->card->number;
 644         info->device = rmidi->device;
 645         info->subdevice = substream->number;
 646         info->stream = substream->stream;
 647         info->flags = rmidi->info_flags;
 648         strcpy(info->id, rmidi->id);
 649         strcpy(info->name, rmidi->name);
 650         strcpy(info->subname, substream->name);
 651         info->subdevices_count = substream->pstr->substream_count;
 652         info->subdevices_avail = (substream->pstr->substream_count -
 653                                   substream->pstr->substream_opened);
 654         return 0;
 655 }
 656
 657 static int snd_rawmidi_info_user(struct snd_rawmidi_substream *substream,
 658                                  struct snd_rawmidi_info __user *_info)
 659 {
 660         struct snd_rawmidi_info info;
 661         int err;
 662
 663         err = snd_rawmidi_info(substream, &info);
 664         if (err < 0)
 665                 return err;
 666         if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
 667                 return -EFAULT;
 668         return 0;
 669 }
 670
 671 static int __snd_rawmidi_info_select(struct snd_card *card,
 672                                      struct snd_rawmidi_info *info)
 673 {
 674         struct snd_rawmidi *rmidi;
 675         struct snd_rawmidi_str *pstr;
 676         struct snd_rawmidi_substream *substream;
 677
 678         rmidi = snd_rawmidi_search(card, info->device);
 679         if (!rmidi)
 680                 return -ENXIO;
 681         if (info->stream < 0 || info->stream > 1)
 682                 return -EINVAL;
 683         info->stream = array_index_nospec(info->stream, 2);
 684         pstr = &rmidi->streams[info->stream];
 685         if (pstr->substream_count == 0)
 686                 return -ENOENT;
 687         if (info->subdevice >= pstr->substream_count)
 688                 return -ENXIO;
 689         list_for_each_entry(substream, &pstr->substreams, list) {
 690                 if ((unsigned int)substream->number == info->subdevice)
 691                         return snd_rawmidi_info(substream, info);
 692         }
 693         return -ENXIO;
 694 }
 695
 696 int snd_rawmidi_info_select(struct snd_card *card, struct snd_rawmidi_info *info)
 697 {
 698         int ret;
 699
 700         mutex_lock(&register_mutex);
 701         ret = __snd_rawmidi_info_select(card, info);
 702         mutex_unlock(&register_mutex);
 703         return ret;
 704 }
 705 EXPORT_SYMBOL(snd_rawmidi_info_select);
 706
 707 static int snd_rawmidi_info_select_user(struct snd_card *card,
 708                                         struct snd_rawmidi_info __user *_info)
 709 {
 710         int err;
 711         struct snd_rawmidi_info info;
 712
 713         if (get_user(info.device, &_info->device))
 714                 return -EFAULT;
 715         if (get_user(info.stream, &_info->stream))
 716                 return -EFAULT;
 717         if (get_user(info.subdevice, &_info->subdevice))
 718                 return -EFAULT;
 719         err = snd_rawmidi_info_select(card, &info);
 720         if (err < 0)
 721                 return err;
 722         if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
 723                 return -EFAULT;
 724         return 0;
 725 }
 726
 727 static int resize_runtime_buffer(struct snd_rawmidi_substream *substream,
 728                                  struct snd_rawmidi_params *params,
 729                                  bool is_input)
 730 {
 731         struct snd_rawmidi_runtime *runtime = substream->runtime;
 732         char *newbuf, *oldbuf;
 733         unsigned int framing = params->mode & SNDRV_RAWMIDI_MODE_FRAMING_MASK;
 734
 735         if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L)
 736                 return -EINVAL;
 737         if (framing == SNDRV_RAWMIDI_MODE_FRAMING_TSTAMP && (params->buffer_size & 0x1f) != 0)
 738                 return -EINVAL;
 739         if (params->avail_min < 1 || params->avail_min > params->buffer_size)
 740                 return -EINVAL;
 741         if (params->buffer_size & get_align(runtime))
 742                 return -EINVAL;
 743         if (params->buffer_size != runtime->buffer_size) {
 744                 newbuf = kvzalloc(params->buffer_size, GFP_KERNEL);
 745                 if (!newbuf)
 746                         return -ENOMEM;
 747                 spin_lock_irq(&substream->lock);
 748                 if (runtime->buffer_ref) {
 749                         spin_unlock_irq(&substream->lock);
 750                         kvfree(newbuf);
 751                         return -EBUSY;
 752                 }
 753                 oldbuf = runtime->buffer;
 754                 runtime->buffer = newbuf;
 755                 runtime->buffer_size = params->buffer_size;
 756                 __reset_runtime_ptrs(runtime, is_input);
 757                 spin_unlock_irq(&substream->lock);
 758                 kvfree(oldbuf);
 759         }
 760         runtime->avail_min = params->avail_min;
 761         return 0;
 762 }
 763
 764 int snd_rawmidi_output_params(struct snd_rawmidi_substream *substream,
 765                               struct snd_rawmidi_params *params)
 766 {
 767         int err;
 768
 769         snd_rawmidi_drain_output(substream);
 770         mutex_lock(&substream->rmidi->open_mutex);
 771         if (substream->append && substream->use_count > 1)
 772                 err = -EBUSY;
 773         else
 774                 err = resize_runtime_buffer(substream, params, false);
 775
 776         if (!err)
 777                 substream->active_sensing = !params->no_active_sensing;
 778         mutex_unlock(&substream->rmidi->open_mutex);
 779         return err;
 780 }
 781 EXPORT_SYMBOL(snd_rawmidi_output_params);
 782
 783 int snd_rawmidi_input_params(struct snd_rawmidi_substream *substream,
 784                              struct snd_rawmidi_params *params)
 785 {
 786         unsigned int framing = params->mode & SNDRV_RAWMIDI_MODE_FRAMING_MASK;
 787         unsigned int clock_type = params->mode & SNDRV_RAWMIDI_MODE_CLOCK_MASK;
 788         int err;
 789
 790         snd_rawmidi_drain_input(substream);
 791         mutex_lock(&substream->rmidi->open_mutex);
 792         if (framing == SNDRV_RAWMIDI_MODE_FRAMING_NONE && clock_type != SNDRV_RAWMIDI_MODE_CLOCK_NONE)
 793                 err = -EINVAL;
 794         else if (clock_type > SNDRV_RAWMIDI_MODE_CLOCK_MONOTONIC_RAW)
 795                 err = -EINVAL;
 796         else if (framing > SNDRV_RAWMIDI_MODE_FRAMING_TSTAMP)
 797                 err = -EINVAL;
 798         else
 799                 err = resize_runtime_buffer(substream, params, true);
 800
 801         if (!err) {
 802                 substream->framing = framing;
 803                 substream->clock_type = clock_type;
 804         }
 805         mutex_unlock(&substream->rmidi->open_mutex);
 806         return 0;
 807 }
 808 EXPORT_SYMBOL(snd_rawmidi_input_params);
 809
 810 static int snd_rawmidi_output_status(struct snd_rawmidi_substream *substream,
 811                                      struct snd_rawmidi_status64 *status)
 812 {
 813         struct snd_rawmidi_runtime *runtime = substream->runtime;
 814
 815         memset(status, 0, sizeof(*status));
 816         status->stream = SNDRV_RAWMIDI_STREAM_OUTPUT;
 817         spin_lock_irq(&substream->lock);
 818         status->avail = runtime->avail;
 819         spin_unlock_irq(&substream->lock);
 820         return 0;
 821 }
 822
 823 static int snd_rawmidi_input_status(struct snd_rawmidi_substream *substream,
 824                                     struct snd_rawmidi_status64 *status)
 825 {
 826         struct snd_rawmidi_runtime *runtime = substream->runtime;
 827
 828         memset(status, 0, sizeof(*status));
 829         status->stream = SNDRV_RAWMIDI_STREAM_INPUT;
 830         spin_lock_irq(&substream->lock);
 831         status->avail = runtime->avail;
 832         status->xruns = runtime->xruns;
 833         runtime->xruns = 0;
 834         spin_unlock_irq(&substream->lock);
 835         return 0;
 836 }
 837
 838 static int snd_rawmidi_ioctl_status32(struct snd_rawmidi_file *rfile,
 839                                       struct snd_rawmidi_status32 __user *argp)
 840 {
 841         int err = 0;
 842         struct snd_rawmidi_status32 __user *status = argp;
 843         struct snd_rawmidi_status32 status32;
 844         struct snd_rawmidi_status64 status64;
 845
 846         if (copy_from_user(&status32, argp,
 847                            sizeof(struct snd_rawmidi_status32)))
 848                 return -EFAULT;
 849
 850         switch (status32.stream) {
 851         case SNDRV_RAWMIDI_STREAM_OUTPUT:
 852                 if (rfile->output == NULL)
 853                         return -EINVAL;
 854                 err = snd_rawmidi_output_status(rfile->output, &status64);
 855                 break;
 856         case SNDRV_RAWMIDI_STREAM_INPUT:
 857                 if (rfile->input == NULL)
 858                         return -EINVAL;
 859                 err = snd_rawmidi_input_status(rfile->input, &status64);
 860                 break;
 861         default:
 862                 return -EINVAL;
 863         }
 864         if (err < 0)
 865                 return err;
 866
 867         status32 = (struct snd_rawmidi_status32) {
 868                 .stream = status64.stream,
 869                 .tstamp_sec = status64.tstamp_sec,
 870                 .tstamp_nsec = status64.tstamp_nsec,
 871                 .avail = status64.avail,
 872                 .xruns = status64.xruns,
 873         };
 874
 875         if (copy_to_user(status, &status32, sizeof(*status)))
 876                 return -EFAULT;
 877
 878         return 0;
 879 }
 880
 881 static int snd_rawmidi_ioctl_status64(struct snd_rawmidi_file *rfile,
 882                                       struct snd_rawmidi_status64 __user *argp)
 883 {
 884         int err = 0;
 885         struct snd_rawmidi_status64 status;
 886
 887         if (copy_from_user(&status, argp, sizeof(struct snd_rawmidi_status64)))
 888                 return -EFAULT;
 889
 890         switch (status.stream) {
 891         case SNDRV_RAWMIDI_STREAM_OUTPUT:
 892                 if (rfile->output == NULL)
 893                         return -EINVAL;
 894                 err = snd_rawmidi_output_status(rfile->output, &status);
 895                 break;
 896         case SNDRV_RAWMIDI_STREAM_INPUT:
 897                 if (rfile->input == NULL)
 898                         return -EINVAL;
 899                 err = snd_rawmidi_input_status(rfile->input, &status);
 900                 break;
 901         default:
 902                 return -EINVAL;
 903         }
 904         if (err < 0)
 905                 return err;
 906         if (copy_to_user(argp, &status,
 907                          sizeof(struct snd_rawmidi_status64)))
 908                 return -EFAULT;
 909         return 0;
 910 }
 911
 912 static long snd_rawmidi_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 913 {
 914         struct snd_rawmidi_file *rfile;
 915         struct snd_rawmidi *rmidi;
 916         void __user *argp = (void __user *)arg;
 917
 918         rfile = file->private_data;
 919         if (((cmd >> 8) & 0xff) != 'W')
 920                 return -ENOTTY;
 921         switch (cmd) {
 922         case SNDRV_RAWMIDI_IOCTL_PVERSION:
 923                 return put_user(SNDRV_RAWMIDI_VERSION, (int __user *)argp) ? -EFAULT : 0;
 924         case SNDRV_RAWMIDI_IOCTL_INFO:
 925         {
 926                 int stream;
 927                 struct snd_rawmidi_info __user *info = argp;
 928
 929                 if (get_user(stream, &info->stream))
 930                         return -EFAULT;
 931                 switch (stream) {
 932                 case SNDRV_RAWMIDI_STREAM_INPUT:
 933                         return snd_rawmidi_info_user(rfile->input, info);
 934                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
 935                         return snd_rawmidi_info_user(rfile->output, info);
 936                 default:
 937                         return -EINVAL;
 938                 }
 939         }
 940         case SNDRV_RAWMIDI_IOCTL_USER_PVERSION:
 941                 if (get_user(rfile->user_pversion, (unsigned int __user *)arg))
 942                         return -EFAULT;
 943                 return 0;
 944
 945         case SNDRV_RAWMIDI_IOCTL_PARAMS:
 946         {
 947                 struct snd_rawmidi_params params;
 948
 949                 if (copy_from_user(&params, argp, sizeof(struct snd_rawmidi_params)))
 950                         return -EFAULT;
 951                 if (rfile->user_pversion < SNDRV_PROTOCOL_VERSION(2, 0, 2)) {
 952                         params.mode = 0;
 953                         memset(params.reserved, 0, sizeof(params.reserved));
 954                 }
 955                 switch (params.stream) {
 956                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
 957                         if (rfile->output == NULL)
 958                                 return -EINVAL;
 959                         return snd_rawmidi_output_params(rfile->output, &params);
 960                 case SNDRV_RAWMIDI_STREAM_INPUT:
 961                         if (rfile->input == NULL)
 962                                 return -EINVAL;
 963                         return snd_rawmidi_input_params(rfile->input, &params);
 964                 default:
 965                         return -EINVAL;
 966                 }
 967         }
 968         case SNDRV_RAWMIDI_IOCTL_STATUS32:
 969                 return snd_rawmidi_ioctl_status32(rfile, argp);
 970         case SNDRV_RAWMIDI_IOCTL_STATUS64:
 971                 return snd_rawmidi_ioctl_status64(rfile, argp);
 972         case SNDRV_RAWMIDI_IOCTL_DROP:
 973         {
 974                 int val;
 975
 976                 if (get_user(val, (int __user *) argp))
 977                         return -EFAULT;
 978                 switch (val) {
 979                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
 980                         if (rfile->output == NULL)
 981                                 return -EINVAL;
 982                         return snd_rawmidi_drop_output(rfile->output);
 983                 default:
 984                         return -EINVAL;
 985                 }
 986         }
 987         case SNDRV_RAWMIDI_IOCTL_DRAIN:
 988         {
 989                 int val;
 990
 991                 if (get_user(val, (int __user *) argp))
 992                         return -EFAULT;
 993                 switch (val) {
 994                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
 995                         if (rfile->output == NULL)
 996                                 return -EINVAL;
 997                         return snd_rawmidi_drain_output(rfile->output);
 998                 case SNDRV_RAWMIDI_STREAM_INPUT:
 999                         if (rfile->input == NULL)
1000                                 return -EINVAL;
1001                         return snd_rawmidi_drain_input(rfile->input);
1002                 default:
1003                         return -EINVAL;
1004                 }
1005         }
1006         default:
1007                 rmidi = rfile->rmidi;
1008                 if (rmidi->ops && rmidi->ops->ioctl)
1009                         return rmidi->ops->ioctl(rmidi, cmd, argp);
1010                 rmidi_dbg(rmidi, "rawmidi: unknown command = 0x%x\n", cmd);
1011         }
1012         return -ENOTTY;
1013 }
1014
1015 /* ioctl to find the next device; either legacy or UMP depending on @find_ump */
1016 static int snd_rawmidi_next_device(struct snd_card *card, int __user *argp,
1017                                    bool find_ump)
1018
1019 {
1020         struct snd_rawmidi *rmidi;
1021         int device;
1022         bool is_ump;
1023
1024         if (get_user(device, argp))
1025                 return -EFAULT;
1026         if (device >= SNDRV_RAWMIDI_DEVICES) /* next device is -1 */
1027                 device = SNDRV_RAWMIDI_DEVICES - 1;
1028         mutex_lock(&register_mutex);
1029         device = device < 0 ? 0 : device + 1;
1030         for (; device < SNDRV_RAWMIDI_DEVICES; device++) {
1031                 rmidi = snd_rawmidi_search(card, device);
1032                 if (!rmidi)
1033                         continue;
1034                 is_ump = rawmidi_is_ump(rmidi);
1035                 if (find_ump == is_ump)
1036                         break;
1037         }
1038         if (device == SNDRV_RAWMIDI_DEVICES)
1039                 device = -1;
1040         mutex_unlock(&register_mutex);
1041         if (put_user(device, argp))
1042                 return -EFAULT;
1043         return 0;
1044 }
1045
1046 #if IS_ENABLED(CONFIG_SND_UMP)
1047 /* inquiry of UMP endpoint and block info via control API */
1048 static int snd_rawmidi_call_ump_ioctl(struct snd_card *card, int cmd,
1049                                       void __user *argp)
1050 {
1051         struct snd_ump_endpoint_info __user *info = argp;
1052         struct snd_rawmidi *rmidi;
1053         int device, ret;
1054
1055         if (get_user(device, &info->device))
1056                 return -EFAULT;
1057         mutex_lock(&register_mutex);
1058         rmidi = snd_rawmidi_search(card, device);
1059         if (rmidi && rmidi->ops && rmidi->ops->ioctl)
1060                 ret = rmidi->ops->ioctl(rmidi, cmd, argp);
1061         else
1062                 ret = -ENXIO;
1063         mutex_unlock(&register_mutex);
1064         return ret;
1065 }
1066 #endif
1067
1068 static int snd_rawmidi_control_ioctl(struct snd_card *card,
1069                                      struct snd_ctl_file *control,
1070                                      unsigned int cmd,
1071                                      unsigned long arg)
1072 {
1073         void __user *argp = (void __user *)arg;
1074
1075         switch (cmd) {
1076         case SNDRV_CTL_IOCTL_RAWMIDI_NEXT_DEVICE:
1077                 return snd_rawmidi_next_device(card, argp, false);
1078 #if IS_ENABLED(CONFIG_SND_UMP)
1079         case SNDRV_CTL_IOCTL_UMP_NEXT_DEVICE:
1080                 return snd_rawmidi_next_device(card, argp, true);
1081         case SNDRV_CTL_IOCTL_UMP_ENDPOINT_INFO:
1082                 return snd_rawmidi_call_ump_ioctl(card, SNDRV_UMP_IOCTL_ENDPOINT_INFO, argp);
1083         case SNDRV_CTL_IOCTL_UMP_BLOCK_INFO:
1084                 return snd_rawmidi_call_ump_ioctl(card, SNDRV_UMP_IOCTL_BLOCK_INFO, argp);
1085 #endif
1086         case SNDRV_CTL_IOCTL_RAWMIDI_PREFER_SUBDEVICE:
1087         {
1088                 int val;
1089
1090                 if (get_user(val, (int __user *)argp))
1091                         return -EFAULT;
1092                 control->preferred_subdevice[SND_CTL_SUBDEV_RAWMIDI] = val;
1093                 return 0;
1094         }
1095         case SNDRV_CTL_IOCTL_RAWMIDI_INFO:
1096                 return snd_rawmidi_info_select_user(card, argp);
1097         }
1098         return -ENOIOCTLCMD;
1099 }
1100
1101 static int receive_with_tstamp_framing(struct snd_rawmidi_substream *substream,
1102                         const unsigned char *buffer, int src_count, const struct timespec64 *tstamp)
1103 {
1104         struct snd_rawmidi_runtime *runtime = substream->runtime;
1105         struct snd_rawmidi_framing_tstamp *dest_ptr;
1106         struct snd_rawmidi_framing_tstamp frame = { .tv_sec = tstamp->tv_sec, .tv_nsec = tstamp->tv_nsec };
1107         int orig_count = src_count;
1108         int frame_size = sizeof(struct snd_rawmidi_framing_tstamp);
1109         int align = get_align(runtime);
1110
1111         BUILD_BUG_ON(frame_size != 0x20);
1112         if (snd_BUG_ON((runtime->hw_ptr & 0x1f) != 0))
1113                 return -EINVAL;
1114
1115         while (src_count > align) {
1116                 if ((int)(runtime->buffer_size - runtime->avail) < frame_size) {
1117                         runtime->xruns += src_count;
1118                         break;
1119                 }
1120                 if (src_count >= SNDRV_RAWMIDI_FRAMING_DATA_LENGTH)
1121                         frame.length = SNDRV_RAWMIDI_FRAMING_DATA_LENGTH;
1122                 else {
1123                         frame.length = get_aligned_size(runtime, src_count);
1124                         if (!frame.length)
1125                                 break;
1126                         memset(frame.data, 0, SNDRV_RAWMIDI_FRAMING_DATA_LENGTH);
1127                 }
1128                 memcpy(frame.data, buffer, frame.length);
1129                 buffer += frame.length;
1130                 src_count -= frame.length;
1131                 dest_ptr = (struct snd_rawmidi_framing_tstamp *) (runtime->buffer + runtime->hw_ptr);
1132                 *dest_ptr = frame;
1133                 runtime->avail += frame_size;
1134                 runtime->hw_ptr += frame_size;
1135                 runtime->hw_ptr %= runtime->buffer_size;
1136         }
1137         return orig_count - src_count;
1138 }
1139
1140 static struct timespec64 get_framing_tstamp(struct snd_rawmidi_substream *substream)
1141 {
1142         struct timespec64 ts64 = {0, 0};
1143
1144         switch (substream->clock_type) {
1145         case SNDRV_RAWMIDI_MODE_CLOCK_MONOTONIC_RAW:
1146                 ktime_get_raw_ts64(&ts64);
1147                 break;
1148         case SNDRV_RAWMIDI_MODE_CLOCK_MONOTONIC:
1149                 ktime_get_ts64(&ts64);
1150                 break;
1151         case SNDRV_RAWMIDI_MODE_CLOCK_REALTIME:
1152                 ktime_get_real_ts64(&ts64);
1153                 break;
1154         }
1155         return ts64;
1156 }
1157
1158 /**
1159  * snd_rawmidi_receive - receive the input data from the device
1160  * @substream: the rawmidi substream
1161  * @buffer: the buffer pointer
1162  * @count: the data size to read
1163  *
1164  * Reads the data from the internal buffer.
1165  *
1166  * Return: The size of read data, or a negative error code on failure.
1167  */
1168 int snd_rawmidi_receive(struct snd_rawmidi_substream *substream,
1169                         const unsigned char *buffer, int count)
1170 {
1171         unsigned long flags;
1172         struct timespec64 ts64 = get_framing_tstamp(substream);
1173         int result = 0, count1;
1174         struct snd_rawmidi_runtime *runtime;
1175
1176         spin_lock_irqsave(&substream->lock, flags);
1177         if (!substream->opened) {
1178                 result = -EBADFD;
1179                 goto unlock;
1180         }
1181         runtime = substream->runtime;
1182         if (!runtime || !runtime->buffer) {
1183                 rmidi_dbg(substream->rmidi,
1184                           "snd_rawmidi_receive: input is not active!!!\n");
1185                 result = -EINVAL;
1186                 goto unlock;
1187         }
1188
1189         count = get_aligned_size(runtime, count);
1190         if (!count)
1191                 goto unlock;
1192
1193         if (substream->framing == SNDRV_RAWMIDI_MODE_FRAMING_TSTAMP) {
1194                 result = receive_with_tstamp_framing(substream, buffer, count, &ts64);
1195         } else if (count == 1) {        /* special case, faster code */
1196                 substream->bytes++;
1197                 if (runtime->avail < runtime->buffer_size) {
1198                         runtime->buffer[runtime->hw_ptr++] = buffer[0];
1199                         runtime->hw_ptr %= runtime->buffer_size;
1200                         runtime->avail++;
1201                         result++;
1202                 } else {
1203                         runtime->xruns++;
1204                 }
1205         } else {
1206                 substream->bytes += count;
1207                 count1 = runtime->buffer_size - runtime->hw_ptr;
1208                 if (count1 > count)
1209                         count1 = count;
1210                 if (count1 > (int)(runtime->buffer_size - runtime->avail))
1211                         count1 = runtime->buffer_size - runtime->avail;
1212                 count1 = get_aligned_size(runtime, count1);
1213                 if (!count1)
1214                         goto unlock;
1215                 memcpy(runtime->buffer + runtime->hw_ptr, buffer, count1);
1216                 runtime->hw_ptr += count1;
1217                 runtime->hw_ptr %= runtime->buffer_size;
1218                 runtime->avail += count1;
1219                 count -= count1;
1220                 result += count1;
1221                 if (count > 0) {
1222                         buffer += count1;
1223                         count1 = count;
1224                         if (count1 > (int)(runtime->buffer_size - runtime->avail)) {
1225                                 count1 = runtime->buffer_size - runtime->avail;
1226                                 runtime->xruns += count - count1;
1227                         }
1228                         if (count1 > 0) {
1229                                 memcpy(runtime->buffer, buffer, count1);
1230                                 runtime->hw_ptr = count1;
1231                                 runtime->avail += count1;
1232                                 result += count1;
1233                         }
1234                 }
1235         }
1236         if (result > 0) {
1237                 if (runtime->event)
1238                         schedule_work(&runtime->event_work);
1239                 else if (__snd_rawmidi_ready(runtime))
1240                         wake_up(&runtime->sleep);
1241         }
1242  unlock:
1243         spin_unlock_irqrestore(&substream->lock, flags);
1244         return result;
1245 }
1246 EXPORT_SYMBOL(snd_rawmidi_receive);
1247
1248 static long snd_rawmidi_kernel_read1(struct snd_rawmidi_substream *substream,
1249                                      unsigned char __user *userbuf,
1250                                      unsigned char *kernelbuf, long count)
1251 {
1252         unsigned long flags;
1253         long result = 0, count1;
1254         struct snd_rawmidi_runtime *runtime = substream->runtime;
1255         unsigned long appl_ptr;
1256         int err = 0;
1257
1258         spin_lock_irqsave(&substream->lock, flags);
1259         snd_rawmidi_buffer_ref(runtime);
1260         while (count > 0 && runtime->avail) {
1261                 count1 = runtime->buffer_size - runtime->appl_ptr;
1262                 if (count1 > count)
1263                         count1 = count;
1264                 if (count1 > (int)runtime->avail)
1265                         count1 = runtime->avail;
1266
1267                 /* update runtime->appl_ptr before unlocking for userbuf */
1268                 appl_ptr = runtime->appl_ptr;
1269                 runtime->appl_ptr += count1;
1270                 runtime->appl_ptr %= runtime->buffer_size;
1271                 runtime->avail -= count1;
1272
1273                 if (kernelbuf)
1274                         memcpy(kernelbuf + result, runtime->buffer + appl_ptr, count1);
1275                 if (userbuf) {
1276                         spin_unlock_irqrestore(&substream->lock, flags);
1277                         if (copy_to_user(userbuf + result,
1278                                          runtime->buffer + appl_ptr, count1))
1279                                 err = -EFAULT;
1280                         spin_lock_irqsave(&substream->lock, flags);
1281                         if (err)
1282                                 goto out;
1283                 }
1284                 result += count1;
1285                 count -= count1;
1286         }
1287  out:
1288         snd_rawmidi_buffer_unref(runtime);
1289         spin_unlock_irqrestore(&substream->lock, flags);
1290         return result > 0 ? result : err;
1291 }
1292
1293 long snd_rawmidi_kernel_read(struct snd_rawmidi_substream *substream,
1294                              unsigned char *buf, long count)
1295 {
1296         snd_rawmidi_input_trigger(substream, 1);
1297         return snd_rawmidi_kernel_read1(substream, NULL/*userbuf*/, buf, count);
1298 }
1299 EXPORT_SYMBOL(snd_rawmidi_kernel_read);
1300
1301 static ssize_t snd_rawmidi_read(struct file *file, char __user *buf, size_t count,
1302                                 loff_t *offset)
1303 {
1304         long result;
1305         int count1;
1306         struct snd_rawmidi_file *rfile;
1307         struct snd_rawmidi_substream *substream;
1308         struct snd_rawmidi_runtime *runtime;
1309
1310         rfile = file->private_data;
1311         substream = rfile->input;
1312         if (substream == NULL)
1313                 return -EIO;
1314         runtime = substream->runtime;
1315         snd_rawmidi_input_trigger(substream, 1);
1316         result = 0;
1317         while (count > 0) {
1318                 spin_lock_irq(&substream->lock);
1319                 while (!__snd_rawmidi_ready(runtime)) {
1320                         wait_queue_entry_t wait;
1321
1322                         if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1323                                 spin_unlock_irq(&substream->lock);
1324                                 return result > 0 ? result : -EAGAIN;
1325                         }
1326                         init_waitqueue_entry(&wait, current);
1327                         add_wait_queue(&runtime->sleep, &wait);
1328                         set_current_state(TASK_INTERRUPTIBLE);
1329                         spin_unlock_irq(&substream->lock);
1330                         schedule();
1331                         remove_wait_queue(&runtime->sleep, &wait);
1332                         if (rfile->rmidi->card->shutdown)
1333                                 return -ENODEV;
1334                         if (signal_pending(current))
1335                                 return result > 0 ? result : -ERESTARTSYS;
1336                         spin_lock_irq(&substream->lock);
1337                         if (!runtime->avail) {
1338                                 spin_unlock_irq(&substream->lock);
1339                                 return result > 0 ? result : -EIO;
1340                         }
1341                 }
1342                 spin_unlock_irq(&substream->lock);
1343                 count1 = snd_rawmidi_kernel_read1(substream,
1344                                                   (unsigned char __user *)buf,
1345                                                   NULL/*kernelbuf*/,
1346                                                   count);
1347                 if (count1 < 0)
1348                         return result > 0 ? result : count1;
1349                 result += count1;
1350                 buf += count1;
1351                 count -= count1;
1352         }
1353         return result;
1354 }
1355
1356 /**
1357  * snd_rawmidi_transmit_empty - check whether the output buffer is empty
1358  * @substream: the rawmidi substream
1359  *
1360  * Return: 1 if the internal output buffer is empty, 0 if not.
1361  */
1362 int snd_rawmidi_transmit_empty(struct snd_rawmidi_substream *substream)
1363 {
1364         struct snd_rawmidi_runtime *runtime;
1365         int result;
1366         unsigned long flags;
1367
1368         spin_lock_irqsave(&substream->lock, flags);
1369         runtime = substream->runtime;
1370         if (!substream->opened || !runtime || !runtime->buffer) {
1371                 rmidi_dbg(substream->rmidi,
1372                           "snd_rawmidi_transmit_empty: output is not active!!!\n");
1373                 result = 1;
1374         } else {
1375                 result = runtime->avail >= runtime->buffer_size;
1376         }
1377         spin_unlock_irqrestore(&substream->lock, flags);
1378         return result;
1379 }
1380 EXPORT_SYMBOL(snd_rawmidi_transmit_empty);
1381
1382 /*
1383  * __snd_rawmidi_transmit_peek - copy data from the internal buffer
1384  * @substream: the rawmidi substream
1385  * @buffer: the buffer pointer
1386  * @count: data size to transfer
1387  *
1388  * This is a variant of snd_rawmidi_transmit_peek() without spinlock.
1389  */
1390 static int __snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
1391                                        unsigned char *buffer, int count)
1392 {
1393         int result, count1;
1394         struct snd_rawmidi_runtime *runtime = substream->runtime;
1395
1396         if (runtime->buffer == NULL) {
1397                 rmidi_dbg(substream->rmidi,
1398                           "snd_rawmidi_transmit_peek: output is not active!!!\n");
1399                 return -EINVAL;
1400         }
1401         result = 0;
1402         if (runtime->avail >= runtime->buffer_size) {
1403                 /* warning: lowlevel layer MUST trigger down the hardware */
1404                 goto __skip;
1405         }
1406         if (count == 1) {       /* special case, faster code */
1407                 *buffer = runtime->buffer[runtime->hw_ptr];
1408                 result++;
1409         } else {
1410                 count1 = runtime->buffer_size - runtime->hw_ptr;
1411                 if (count1 > count)
1412                         count1 = count;
1413                 if (count1 > (int)(runtime->buffer_size - runtime->avail))
1414                         count1 = runtime->buffer_size - runtime->avail;
1415                 count1 = get_aligned_size(runtime, count1);
1416                 if (!count1)
1417                         goto __skip;
1418                 memcpy(buffer, runtime->buffer + runtime->hw_ptr, count1);
1419                 count -= count1;
1420                 result += count1;
1421                 if (count > 0) {
1422                         if (count > (int)(runtime->buffer_size - runtime->avail - count1))
1423                                 count = runtime->buffer_size - runtime->avail - count1;
1424                         count = get_aligned_size(runtime, count);
1425                         if (!count)
1426                                 goto __skip;
1427                         memcpy(buffer + count1, runtime->buffer, count);
1428                         result += count;
1429                 }
1430         }
1431       __skip:
1432         return result;
1433 }
1434
1435 /**
1436  * snd_rawmidi_transmit_peek - copy data from the internal buffer
1437  * @substream: the rawmidi substream
1438  * @buffer: the buffer pointer
1439  * @count: data size to transfer
1440  *
1441  * Copies data from the internal output buffer to the given buffer.
1442  *
1443  * Call this in the interrupt handler when the midi output is ready,
1444  * and call snd_rawmidi_transmit_ack() after the transmission is
1445  * finished.
1446  *
1447  * Return: The size of copied data, or a negative error code on failure.
1448  */
1449 int snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
1450                               unsigned char *buffer, int count)
1451 {
1452         int result;
1453         unsigned long flags;
1454
1455         spin_lock_irqsave(&substream->lock, flags);
1456         if (!substream->opened || !substream->runtime)
1457                 result = -EBADFD;
1458         else
1459                 result = __snd_rawmidi_transmit_peek(substream, buffer, count);
1460         spin_unlock_irqrestore(&substream->lock, flags);
1461         return result;
1462 }
1463 EXPORT_SYMBOL(snd_rawmidi_transmit_peek);
1464
1465 /*
1466  * __snd_rawmidi_transmit_ack - acknowledge the transmission
1467  * @substream: the rawmidi substream
1468  * @count: the transferred count
1469  *
1470  * This is a variant of __snd_rawmidi_transmit_ack() without spinlock.
1471  */
1472 static int __snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream,
1473                                       int count)
1474 {
1475         struct snd_rawmidi_runtime *runtime = substream->runtime;
1476
1477         if (runtime->buffer == NULL) {
1478                 rmidi_dbg(substream->rmidi,
1479                           "snd_rawmidi_transmit_ack: output is not active!!!\n");
1480                 return -EINVAL;
1481         }
1482         snd_BUG_ON(runtime->avail + count > runtime->buffer_size);
1483         count = get_aligned_size(runtime, count);
1484         runtime->hw_ptr += count;
1485         runtime->hw_ptr %= runtime->buffer_size;
1486         runtime->avail += count;
1487         substream->bytes += count;
1488         if (count > 0) {
1489                 if (runtime->drain || __snd_rawmidi_ready(runtime))
1490                         wake_up(&runtime->sleep);
1491         }
1492         return count;
1493 }
1494
1495 /**
1496  * snd_rawmidi_transmit_ack - acknowledge the transmission
1497  * @substream: the rawmidi substream
1498  * @count: the transferred count
1499  *
1500  * Advances the hardware pointer for the internal output buffer with
1501  * the given size and updates the condition.
1502  * Call after the transmission is finished.
1503  *
1504  * Return: The advanced size if successful, or a negative error code on failure.
1505  */
1506 int snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count)
1507 {
1508         int result;
1509         unsigned long flags;
1510
1511         spin_lock_irqsave(&substream->lock, flags);
1512         if (!substream->opened || !substream->runtime)
1513                 result = -EBADFD;
1514         else
1515                 result = __snd_rawmidi_transmit_ack(substream, count);
1516         spin_unlock_irqrestore(&substream->lock, flags);
1517         return result;
1518 }
1519 EXPORT_SYMBOL(snd_rawmidi_transmit_ack);
1520
1521 /**
1522  * snd_rawmidi_transmit - copy from the buffer to the device
1523  * @substream: the rawmidi substream
1524  * @buffer: the buffer pointer
1525  * @count: the data size to transfer
1526  *
1527  * Copies data from the buffer to the device and advances the pointer.
1528  *
1529  * Return: The copied size if successful, or a negative error code on failure.
1530  */
1531 int snd_rawmidi_transmit(struct snd_rawmidi_substream *substream,
1532                          unsigned char *buffer, int count)
1533 {
1534         int result;
1535         unsigned long flags;
1536
1537         spin_lock_irqsave(&substream->lock, flags);
1538         if (!substream->opened)
1539                 result = -EBADFD;
1540         else {
1541                 count = __snd_rawmidi_transmit_peek(substream, buffer, count);
1542                 if (count <= 0)
1543                         result = count;
1544                 else
1545                         result = __snd_rawmidi_transmit_ack(substream, count);
1546         }
1547         spin_unlock_irqrestore(&substream->lock, flags);
1548         return result;
1549 }
1550 EXPORT_SYMBOL(snd_rawmidi_transmit);
1551
1552 /**
1553  * snd_rawmidi_proceed - Discard the all pending bytes and proceed
1554  * @substream: rawmidi substream
1555  *
1556  * Return: the number of discarded bytes
1557  */
1558 int snd_rawmidi_proceed(struct snd_rawmidi_substream *substream)
1559 {
1560         struct snd_rawmidi_runtime *runtime;
1561         unsigned long flags;
1562         int count = 0;
1563
1564         spin_lock_irqsave(&substream->lock, flags);
1565         runtime = substream->runtime;
1566         if (substream->opened && runtime &&
1567             runtime->avail < runtime->buffer_size) {
1568                 count = runtime->buffer_size - runtime->avail;
1569                 __snd_rawmidi_transmit_ack(substream, count);
1570         }
1571         spin_unlock_irqrestore(&substream->lock, flags);
1572         return count;
1573 }
1574 EXPORT_SYMBOL(snd_rawmidi_proceed);
1575
1576 static long snd_rawmidi_kernel_write1(struct snd_rawmidi_substream *substream,
1577                                       const unsigned char __user *userbuf,
1578                                       const unsigned char *kernelbuf,
1579                                       long count)
1580 {
1581         unsigned long flags;
1582         long count1, result;
1583         struct snd_rawmidi_runtime *runtime = substream->runtime;
1584         unsigned long appl_ptr;
1585
1586         if (!kernelbuf && !userbuf)
1587                 return -EINVAL;
1588         if (snd_BUG_ON(!runtime->buffer))
1589                 return -EINVAL;
1590
1591         result = 0;
1592         spin_lock_irqsave(&substream->lock, flags);
1593         if (substream->append) {
1594                 if ((long)runtime->avail < count) {
1595                         spin_unlock_irqrestore(&substream->lock, flags);
1596                         return -EAGAIN;
1597                 }
1598         }
1599         snd_rawmidi_buffer_ref(runtime);
1600         while (count > 0 && runtime->avail > 0) {
1601                 count1 = runtime->buffer_size - runtime->appl_ptr;
1602                 if (count1 > count)
1603                         count1 = count;
1604                 if (count1 > (long)runtime->avail)
1605                         count1 = runtime->avail;
1606
1607                 /* update runtime->appl_ptr before unlocking for userbuf */
1608                 appl_ptr = runtime->appl_ptr;
1609                 runtime->appl_ptr += count1;
1610                 runtime->appl_ptr %= runtime->buffer_size;
1611                 runtime->avail -= count1;
1612
1613                 if (kernelbuf)
1614                         memcpy(runtime->buffer + appl_ptr,
1615                                kernelbuf + result, count1);
1616                 else if (userbuf) {
1617                         spin_unlock_irqrestore(&substream->lock, flags);
1618                         if (copy_from_user(runtime->buffer + appl_ptr,
1619                                            userbuf + result, count1)) {
1620                                 spin_lock_irqsave(&substream->lock, flags);
1621                                 result = result > 0 ? result : -EFAULT;
1622                                 goto __end;
1623                         }
1624                         spin_lock_irqsave(&substream->lock, flags);
1625                 }
1626                 result += count1;
1627                 count -= count1;
1628         }
1629       __end:
1630         count1 = runtime->avail < runtime->buffer_size;
1631         snd_rawmidi_buffer_unref(runtime);
1632         spin_unlock_irqrestore(&substream->lock, flags);
1633         if (count1)
1634                 snd_rawmidi_output_trigger(substream, 1);
1635         return result;
1636 }
1637
1638 long snd_rawmidi_kernel_write(struct snd_rawmidi_substream *substream,
1639                               const unsigned char *buf, long count)
1640 {
1641         return snd_rawmidi_kernel_write1(substream, NULL, buf, count);
1642 }
1643 EXPORT_SYMBOL(snd_rawmidi_kernel_write);
1644
1645 static ssize_t snd_rawmidi_write(struct file *file, const char __user *buf,
1646                                  size_t count, loff_t *offset)
1647 {
1648         long result, timeout;
1649         int count1;
1650         struct snd_rawmidi_file *rfile;
1651         struct snd_rawmidi_runtime *runtime;
1652         struct snd_rawmidi_substream *substream;
1653
1654         rfile = file->private_data;
1655         substream = rfile->output;
1656         runtime = substream->runtime;
1657         /* we cannot put an atomic message to our buffer */
1658         if (substream->append && count > runtime->buffer_size)
1659                 return -EIO;
1660         result = 0;
1661         while (count > 0) {
1662                 spin_lock_irq(&substream->lock);
1663                 while (!snd_rawmidi_ready_append(substream, count)) {
1664                         wait_queue_entry_t wait;
1665
1666                         if (file->f_flags & O_NONBLOCK) {
1667                                 spin_unlock_irq(&substream->lock);
1668                                 return result > 0 ? result : -EAGAIN;
1669                         }
1670                         init_waitqueue_entry(&wait, current);
1671                         add_wait_queue(&runtime->sleep, &wait);
1672                         set_current_state(TASK_INTERRUPTIBLE);
1673                         spin_unlock_irq(&substream->lock);
1674                         timeout = schedule_timeout(30 * HZ);
1675                         remove_wait_queue(&runtime->sleep, &wait);
1676                         if (rfile->rmidi->card->shutdown)
1677                                 return -ENODEV;
1678                         if (signal_pending(current))
1679                                 return result > 0 ? result : -ERESTARTSYS;
1680                         spin_lock_irq(&substream->lock);
1681                         if (!runtime->avail && !timeout) {
1682                                 spin_unlock_irq(&substream->lock);
1683                                 return result > 0 ? result : -EIO;
1684                         }
1685                 }
1686                 spin_unlock_irq(&substream->lock);
1687                 count1 = snd_rawmidi_kernel_write1(substream, buf, NULL, count);
1688                 if (count1 < 0)
1689                         return result > 0 ? result : count1;
1690                 result += count1;
1691                 buf += count1;
1692                 if ((size_t)count1 < count && (file->f_flags & O_NONBLOCK))
1693                         break;
1694                 count -= count1;
1695         }
1696         if (file->f_flags & O_DSYNC) {
1697                 spin_lock_irq(&substream->lock);
1698                 while (runtime->avail != runtime->buffer_size) {
1699                         wait_queue_entry_t wait;
1700                         unsigned int last_avail = runtime->avail;
1701
1702                         init_waitqueue_entry(&wait, current);
1703                         add_wait_queue(&runtime->sleep, &wait);
1704                         set_current_state(TASK_INTERRUPTIBLE);
1705                         spin_unlock_irq(&substream->lock);
1706                         timeout = schedule_timeout(30 * HZ);
1707                         remove_wait_queue(&runtime->sleep, &wait);
1708                         if (signal_pending(current))
1709                                 return result > 0 ? result : -ERESTARTSYS;
1710                         if (runtime->avail == last_avail && !timeout)
1711                                 return result > 0 ? result : -EIO;
1712                         spin_lock_irq(&substream->lock);
1713                 }
1714                 spin_unlock_irq(&substream->lock);
1715         }
1716         return result;
1717 }
1718
1719 static __poll_t snd_rawmidi_poll(struct file *file, poll_table *wait)
1720 {
1721         struct snd_rawmidi_file *rfile;
1722         struct snd_rawmidi_runtime *runtime;
1723         __poll_t mask;
1724
1725         rfile = file->private_data;
1726         if (rfile->input != NULL) {
1727                 runtime = rfile->input->runtime;
1728                 snd_rawmidi_input_trigger(rfile->input, 1);
1729                 poll_wait(file, &runtime->sleep, wait);
1730         }
1731         if (rfile->output != NULL) {
1732                 runtime = rfile->output->runtime;
1733                 poll_wait(file, &runtime->sleep, wait);
1734         }
1735         mask = 0;
1736         if (rfile->input != NULL) {
1737                 if (snd_rawmidi_ready(rfile->input))
1738                         mask |= EPOLLIN | EPOLLRDNORM;
1739         }
1740         if (rfile->output != NULL) {
1741                 if (snd_rawmidi_ready(rfile->output))
1742                         mask |= EPOLLOUT | EPOLLWRNORM;
1743         }
1744         return mask;
1745 }
1746
1747 /*
1748  */
1749 #ifdef CONFIG_COMPAT
1750 #include "rawmidi_compat.c"
1751 #else
1752 #define snd_rawmidi_ioctl_compat        NULL
1753 #endif
1754
1755 /*
1756  */
1757
1758 static void snd_rawmidi_proc_info_read(struct snd_info_entry *entry,
1759                                        struct snd_info_buffer *buffer)
1760 {
1761         struct snd_rawmidi *rmidi;
1762         struct snd_rawmidi_substream *substream;
1763         struct snd_rawmidi_runtime *runtime;
1764         unsigned long buffer_size, avail, xruns;
1765         unsigned int clock_type;
1766         static const char *clock_names[4] = { "none", "realtime", "monotonic", "monotonic raw" };
1767
1768         rmidi = entry->private_data;
1769         snd_iprintf(buffer, "%s\n\n", rmidi->name);
1770         if (IS_ENABLED(CONFIG_SND_UMP))
1771                 snd_iprintf(buffer, "Type: %s\n",
1772                             rawmidi_is_ump(rmidi) ? "UMP" : "Legacy");
1773         if (rmidi->ops && rmidi->ops->proc_read)
1774                 rmidi->ops->proc_read(entry, buffer);
1775         mutex_lock(&rmidi->open_mutex);
1776         if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_OUTPUT) {
1777                 list_for_each_entry(substream,
1778                                     &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams,
1779                                     list) {
1780                         snd_iprintf(buffer,
1781                                     "Output %d\n"
1782                                     "  Tx bytes     : %lu\n",
1783                                     substream->number,
1784                                     (unsigned long) substream->bytes);
1785                         if (substream->opened) {
1786                                 snd_iprintf(buffer,
1787                                     "  Owner PID    : %d\n",
1788                                     pid_vnr(substream->pid));
1789                                 runtime = substream->runtime;
1790                                 spin_lock_irq(&substream->lock);
1791                                 buffer_size = runtime->buffer_size;
1792                                 avail = runtime->avail;
1793                                 spin_unlock_irq(&substream->lock);
1794                                 snd_iprintf(buffer,
1795                                     "  Mode         : %s\n"
1796                                     "  Buffer size  : %lu\n"
1797                                     "  Avail        : %lu\n",
1798                                     runtime->oss ? "OSS compatible" : "native",
1799                                     buffer_size, avail);
1800                         }
1801                 }
1802         }
1803         if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_INPUT) {
1804                 list_for_each_entry(substream,
1805                                     &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams,
1806                                     list) {
1807                         snd_iprintf(buffer,
1808                                     "Input %d\n"
1809                                     "  Rx bytes     : %lu\n",
1810                                     substream->number,
1811                                     (unsigned long) substream->bytes);
1812                         if (substream->opened) {
1813                                 snd_iprintf(buffer,
1814                                             "  Owner PID    : %d\n",
1815                                             pid_vnr(substream->pid));
1816                                 runtime = substream->runtime;
1817                                 spin_lock_irq(&substream->lock);
1818                                 buffer_size = runtime->buffer_size;
1819                                 avail = runtime->avail;
1820                                 xruns = runtime->xruns;
1821                                 spin_unlock_irq(&substream->lock);
1822                                 snd_iprintf(buffer,
1823                                             "  Buffer size  : %lu\n"
1824                                             "  Avail        : %lu\n"
1825                                             "  Overruns     : %lu\n",
1826                                             buffer_size, avail, xruns);
1827                                 if (substream->framing == SNDRV_RAWMIDI_MODE_FRAMING_TSTAMP) {
1828                                         clock_type = substream->clock_type >> SNDRV_RAWMIDI_MODE_CLOCK_SHIFT;
1829                                         if (!snd_BUG_ON(clock_type >= ARRAY_SIZE(clock_names)))
1830                                                 snd_iprintf(buffer,
1831                                                             "  Framing      : tstamp\n"
1832                                                             "  Clock type   : %s\n",
1833                                                             clock_names[clock_type]);
1834                                 }
1835                         }
1836                 }
1837         }
1838         mutex_unlock(&rmidi->open_mutex);
1839 }
1840
1841 /*
1842  *  Register functions
1843  */
1844
1845 static const struct file_operations snd_rawmidi_f_ops = {
1846         .owner =        THIS_MODULE,
1847         .read =         snd_rawmidi_read,
1848         .write =        snd_rawmidi_write,
1849         .open =         snd_rawmidi_open,
1850         .release =      snd_rawmidi_release,
1851         .llseek =       no_llseek,
1852         .poll =         snd_rawmidi_poll,
1853         .unlocked_ioctl =       snd_rawmidi_ioctl,
1854         .compat_ioctl = snd_rawmidi_ioctl_compat,
1855 };
1856
1857 static int snd_rawmidi_alloc_substreams(struct snd_rawmidi *rmidi,
1858                                         struct snd_rawmidi_str *stream,
1859                                         int direction,
1860                                         int count)
1861 {
1862         struct snd_rawmidi_substream *substream;
1863         int idx;
1864
1865         for (idx = 0; idx < count; idx++) {
1866                 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
1867                 if (!substream)
1868                         return -ENOMEM;
1869                 substream->stream = direction;
1870                 substream->number = idx;
1871                 substream->rmidi = rmidi;
1872                 substream->pstr = stream;
1873                 spin_lock_init(&substream->lock);
1874                 list_add_tail(&substream->list, &stream->substreams);
1875                 stream->substream_count++;
1876         }
1877         return 0;
1878 }
1879
1880 /* used for both rawmidi and ump */
1881 int snd_rawmidi_init(struct snd_rawmidi *rmidi,
1882                      struct snd_card *card, char *id, int device,
1883                      int output_count, int input_count,
1884                      unsigned int info_flags)
1885 {
1886         int err;
1887         static const struct snd_device_ops ops = {
1888                 .dev_free = snd_rawmidi_dev_free,
1889                 .dev_register = snd_rawmidi_dev_register,
1890                 .dev_disconnect = snd_rawmidi_dev_disconnect,
1891         };
1892
1893         rmidi->card = card;
1894         rmidi->device = device;
1895         mutex_init(&rmidi->open_mutex);
1896         init_waitqueue_head(&rmidi->open_wait);
1897         INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams);
1898         INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams);
1899         rmidi->info_flags = info_flags;
1900
1901         if (id != NULL)
1902                 strscpy(rmidi->id, id, sizeof(rmidi->id));
1903
1904         err = snd_device_alloc(&rmidi->dev, card);
1905         if (err < 0)
1906                 return err;
1907         if (rawmidi_is_ump(rmidi))
1908                 dev_set_name(rmidi->dev, "umpC%iD%i", card->number, device);
1909         else
1910                 dev_set_name(rmidi->dev, "midiC%iD%i", card->number, device);
1911
1912         err = snd_rawmidi_alloc_substreams(rmidi,
1913                                            &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT],
1914                                            SNDRV_RAWMIDI_STREAM_INPUT,
1915                                            input_count);
1916         if (err < 0)
1917                 return err;
1918         err = snd_rawmidi_alloc_substreams(rmidi,
1919                                            &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT],
1920                                            SNDRV_RAWMIDI_STREAM_OUTPUT,
1921                                            output_count);
1922         if (err < 0)
1923                 return err;
1924         err = snd_device_new(card, SNDRV_DEV_RAWMIDI, rmidi, &ops);
1925         if (err < 0)
1926                 return err;
1927         return 0;
1928 }
1929 EXPORT_SYMBOL_GPL(snd_rawmidi_init);
1930
1931 /**
1932  * snd_rawmidi_new - create a rawmidi instance
1933  * @card: the card instance
1934  * @id: the id string
1935  * @device: the device index
1936  * @output_count: the number of output streams
1937  * @input_count: the number of input streams
1938  * @rrawmidi: the pointer to store the new rawmidi instance
1939  *
1940  * Creates a new rawmidi instance.
1941  * Use snd_rawmidi_set_ops() to set the operators to the new instance.
1942  *
1943  * Return: Zero if successful, or a negative error code on failure.
1944  */
1945 int snd_rawmidi_new(struct snd_card *card, char *id, int device,
1946                     int output_count, int input_count,
1947                     struct snd_rawmidi **rrawmidi)
1948 {
1949         struct snd_rawmidi *rmidi;
1950         int err;
1951
1952         if (rrawmidi)
1953                 *rrawmidi = NULL;
1954         rmidi = kzalloc(sizeof(*rmidi), GFP_KERNEL);
1955         if (!rmidi)
1956                 return -ENOMEM;
1957         err = snd_rawmidi_init(rmidi, card, id, device,
1958                                output_count, input_count, 0);
1959         if (err < 0) {
1960                 snd_rawmidi_free(rmidi);
1961                 return err;
1962         }
1963         if (rrawmidi)
1964                 *rrawmidi = rmidi;
1965         return 0;
1966 }
1967 EXPORT_SYMBOL(snd_rawmidi_new);
1968
1969 static void snd_rawmidi_free_substreams(struct snd_rawmidi_str *stream)
1970 {
1971         struct snd_rawmidi_substream *substream;
1972
1973         while (!list_empty(&stream->substreams)) {
1974                 substream = list_entry(stream->substreams.next, struct snd_rawmidi_substream, list);
1975                 list_del(&substream->list);
1976                 kfree(substream);
1977         }
1978 }
1979
1980 /* called from ump.c, too */
1981 int snd_rawmidi_free(struct snd_rawmidi *rmidi)
1982 {
1983         if (!rmidi)
1984                 return 0;
1985
1986         snd_info_free_entry(rmidi->proc_entry);
1987         rmidi->proc_entry = NULL;
1988         if (rmidi->ops && rmidi->ops->dev_unregister)
1989                 rmidi->ops->dev_unregister(rmidi);
1990
1991         snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT]);
1992         snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT]);
1993         if (rmidi->private_free)
1994                 rmidi->private_free(rmidi);
1995         put_device(rmidi->dev);
1996         kfree(rmidi);
1997         return 0;
1998 }
1999 EXPORT_SYMBOL_GPL(snd_rawmidi_free);
2000
2001 static int snd_rawmidi_dev_free(struct snd_device *device)
2002 {
2003         struct snd_rawmidi *rmidi = device->device_data;
2004
2005         return snd_rawmidi_free(rmidi);
2006 }
2007
2008 #if IS_ENABLED(CONFIG_SND_SEQUENCER)
2009 static void snd_rawmidi_dev_seq_free(struct snd_seq_device *device)
2010 {
2011         struct snd_rawmidi *rmidi = device->private_data;
2012
2013         rmidi->seq_dev = NULL;
2014 }
2015 #endif
2016
2017 static int snd_rawmidi_dev_register(struct snd_device *device)
2018 {
2019         int err;
2020         struct snd_info_entry *entry;
2021         char name[16];
2022         struct snd_rawmidi *rmidi = device->device_data;
2023
2024         if (rmidi->device >= SNDRV_RAWMIDI_DEVICES)
2025                 return -ENOMEM;
2026         err = 0;
2027         mutex_lock(&register_mutex);
2028         if (snd_rawmidi_search(rmidi->card, rmidi->device))
2029                 err = -EBUSY;
2030         else
2031                 list_add_tail(&rmidi->list, &snd_rawmidi_devices);
2032         mutex_unlock(&register_mutex);
2033         if (err < 0)
2034                 return err;
2035
2036         err = snd_register_device(SNDRV_DEVICE_TYPE_RAWMIDI,
2037                                   rmidi->card, rmidi->device,
2038                                   &snd_rawmidi_f_ops, rmidi, rmidi->dev);
2039         if (err < 0) {
2040                 rmidi_err(rmidi, "unable to register\n");
2041                 goto error;
2042         }
2043         if (rmidi->ops && rmidi->ops->dev_register) {
2044                 err = rmidi->ops->dev_register(rmidi);
2045                 if (err < 0)
2046                         goto error_unregister;
2047         }
2048 #ifdef CONFIG_SND_OSSEMUL
2049         rmidi->ossreg = 0;
2050         if (!rawmidi_is_ump(rmidi) &&
2051             (int)rmidi->device == midi_map[rmidi->card->number]) {
2052                 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
2053                                             rmidi->card, 0, &snd_rawmidi_f_ops,
2054                                             rmidi) < 0) {
2055                         rmidi_err(rmidi,
2056                                   "unable to register OSS rawmidi device %i:%i\n",
2057                                   rmidi->card->number, 0);
2058                 } else {
2059                         rmidi->ossreg++;
2060 #ifdef SNDRV_OSS_INFO_DEV_MIDI
2061                         snd_oss_info_register(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number, rmidi->name);
2062 #endif
2063                 }
2064         }
2065         if (!rawmidi_is_ump(rmidi) &&
2066             (int)rmidi->device == amidi_map[rmidi->card->number]) {
2067                 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
2068                                             rmidi->card, 1, &snd_rawmidi_f_ops,
2069                                             rmidi) < 0) {
2070                         rmidi_err(rmidi,
2071                                   "unable to register OSS rawmidi device %i:%i\n",
2072                                   rmidi->card->number, 1);
2073                 } else {
2074                         rmidi->ossreg++;
2075                 }
2076         }
2077 #endif /* CONFIG_SND_OSSEMUL */
2078         sprintf(name, "midi%d", rmidi->device);
2079         entry = snd_info_create_card_entry(rmidi->card, name, rmidi->card->proc_root);
2080         if (entry) {
2081                 entry->private_data = rmidi;
2082                 entry->c.text.read = snd_rawmidi_proc_info_read;
2083                 if (snd_info_register(entry) < 0) {
2084                         snd_info_free_entry(entry);
2085                         entry = NULL;
2086                 }
2087         }
2088         rmidi->proc_entry = entry;
2089 #if IS_ENABLED(CONFIG_SND_SEQUENCER)
2090         /* no own registration mechanism? */
2091         if (!rmidi->ops || !rmidi->ops->dev_register) {
2092                 if (snd_seq_device_new(rmidi->card, rmidi->device, SNDRV_SEQ_DEV_ID_MIDISYNTH, 0, &rmidi->seq_dev) >= 0) {
2093                         rmidi->seq_dev->private_data = rmidi;
2094                         rmidi->seq_dev->private_free = snd_rawmidi_dev_seq_free;
2095                         sprintf(rmidi->seq_dev->name, "MIDI %d-%d", rmidi->card->number, rmidi->device);
2096                         snd_device_register(rmidi->card, rmidi->seq_dev);
2097                 }
2098         }
2099 #endif
2100         return 0;
2101
2102  error_unregister:
2103         snd_unregister_device(rmidi->dev);
2104  error:
2105         mutex_lock(&register_mutex);
2106         list_del(&rmidi->list);
2107         mutex_unlock(&register_mutex);
2108         return err;
2109 }
2110
2111 static int snd_rawmidi_dev_disconnect(struct snd_device *device)
2112 {
2113         struct snd_rawmidi *rmidi = device->device_data;
2114         int dir;
2115
2116         mutex_lock(&register_mutex);
2117         mutex_lock(&rmidi->open_mutex);
2118         wake_up(&rmidi->open_wait);
2119         list_del_init(&rmidi->list);
2120         for (dir = 0; dir < 2; dir++) {
2121                 struct snd_rawmidi_substream *s;
2122
2123                 list_for_each_entry(s, &rmidi->streams[dir].substreams, list) {
2124                         if (s->runtime)
2125                                 wake_up(&s->runtime->sleep);
2126                 }
2127         }
2128
2129 #ifdef CONFIG_SND_OSSEMUL
2130         if (rmidi->ossreg) {
2131                 if ((int)rmidi->device == midi_map[rmidi->card->number]) {
2132                         snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 0);
2133 #ifdef SNDRV_OSS_INFO_DEV_MIDI
2134                         snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number);
2135 #endif
2136                 }
2137                 if ((int)rmidi->device == amidi_map[rmidi->card->number])
2138                         snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 1);
2139                 rmidi->ossreg = 0;
2140         }
2141 #endif /* CONFIG_SND_OSSEMUL */
2142         snd_unregister_device(rmidi->dev);
2143         mutex_unlock(&rmidi->open_mutex);
2144         mutex_unlock(&register_mutex);
2145         return 0;
2146 }
2147
2148 /**
2149  * snd_rawmidi_set_ops - set the rawmidi operators
2150  * @rmidi: the rawmidi instance
2151  * @stream: the stream direction, SNDRV_RAWMIDI_STREAM_XXX
2152  * @ops: the operator table
2153  *
2154  * Sets the rawmidi operators for the given stream direction.
2155  */
2156 void snd_rawmidi_set_ops(struct snd_rawmidi *rmidi, int stream,
2157                          const struct snd_rawmidi_ops *ops)
2158 {
2159         struct snd_rawmidi_substream *substream;
2160
2161         list_for_each_entry(substream, &rmidi->streams[stream].substreams, list)
2162                 substream->ops = ops;
2163 }
2164 EXPORT_SYMBOL(snd_rawmidi_set_ops);
2165
2166 /*
2167  *  ENTRY functions
2168  */
2169
2170 static int __init alsa_rawmidi_init(void)
2171 {
2172
2173         snd_ctl_register_ioctl(snd_rawmidi_control_ioctl);
2174         snd_ctl_register_ioctl_compat(snd_rawmidi_control_ioctl);
2175 #ifdef CONFIG_SND_OSSEMUL
2176         { int i;
2177         /* check device map table */
2178         for (i = 0; i < SNDRV_CARDS; i++) {
2179                 if (midi_map[i] < 0 || midi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
2180                         pr_err("ALSA: rawmidi: invalid midi_map[%d] = %d\n",
2181                                i, midi_map[i]);
2182                         midi_map[i] = 0;
2183                 }
2184                 if (amidi_map[i] < 0 || amidi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
2185                         pr_err("ALSA: rawmidi: invalid amidi_map[%d] = %d\n",
2186                                i, amidi_map[i]);
2187                         amidi_map[i] = 1;
2188                 }
2189         }
2190         }
2191 #endif /* CONFIG_SND_OSSEMUL */
2192         return 0;
2193 }
2194
2195 static void __exit alsa_rawmidi_exit(void)
2196 {
2197         snd_ctl_unregister_ioctl(snd_rawmidi_control_ioctl);
2198         snd_ctl_unregister_ioctl_compat(snd_rawmidi_control_ioctl);
2199 }
2200
2201 module_init(alsa_rawmidi_init)
2202 module_exit(alsa_rawmidi_exit)