sound/core/rawmidi.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  Abstract layer for MIDI v1.0 stream
   4  *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
   5  */
   6
   7 #include <sound/core.h>
   8 #include <linux/major.h>
   9 #include <linux/init.h>
  10 #include <linux/sched/signal.h>
  11 #include <linux/slab.h>
  12 #include <linux/time.h>
  13 #include <linux/wait.h>
  14 #include <linux/mutex.h>
  15 #include <linux/module.h>
  16 #include <linux/delay.h>
  17 #include <linux/mm.h>
  18 #include <linux/nospec.h>
  19 #include <sound/rawmidi.h>
  20 #include <sound/info.h>
  21 #include <sound/control.h>
  22 #include <sound/minors.h>
  23 #include <sound/initval.h>
  24
  25 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
  26 MODULE_DESCRIPTION("Midlevel RawMidi code for ALSA.");
  27 MODULE_LICENSE("GPL");
  28
  29 #ifdef CONFIG_SND_OSSEMUL
  30 static int midi_map[SNDRV_CARDS];
  31 static int amidi_map[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS-1)] = 1};
  32 module_param_array(midi_map, int, NULL, 0444);
  33 MODULE_PARM_DESC(midi_map, "Raw MIDI device number assigned to 1st OSS device.");
  34 module_param_array(amidi_map, int, NULL, 0444);
  35 MODULE_PARM_DESC(amidi_map, "Raw MIDI device number assigned to 2nd OSS device.");
  36 #endif /* CONFIG_SND_OSSEMUL */
  37
  38 static int snd_rawmidi_free(struct snd_rawmidi *rmidi);
  39 static int snd_rawmidi_dev_free(struct snd_device *device);
  40 static int snd_rawmidi_dev_register(struct snd_device *device);
  41 static int snd_rawmidi_dev_disconnect(struct snd_device *device);
  42
  43 static LIST_HEAD(snd_rawmidi_devices);
  44 static DEFINE_MUTEX(register_mutex);
  45
  46 #define rmidi_err(rmidi, fmt, args...) \
  47         dev_err(&(rmidi)->dev, fmt, ##args)
  48 #define rmidi_warn(rmidi, fmt, args...) \
  49         dev_warn(&(rmidi)->dev, fmt, ##args)
  50 #define rmidi_dbg(rmidi, fmt, args...) \
  51         dev_dbg(&(rmidi)->dev, fmt, ##args)
  52
  53 struct snd_rawmidi_status32 {
  54         s32 stream;
  55         s32 tstamp_sec;                 /* Timestamp */
  56         s32 tstamp_nsec;
  57         u32 avail;                      /* available bytes */
  58         u32 xruns;                      /* count of overruns since last status (in bytes) */
  59         unsigned char reserved[16];     /* reserved for future use */
  60 };
  61
  62 #define SNDRV_RAWMIDI_IOCTL_STATUS32    _IOWR('W', 0x20, struct snd_rawmidi_status32)
  63
  64 struct snd_rawmidi_status64 {
  65         int stream;
  66         u8 rsvd[4];                     /* alignment */
  67         s64 tstamp_sec;                 /* Timestamp */
  68         s64 tstamp_nsec;
  69         size_t avail;                   /* available bytes */
  70         size_t xruns;                   /* count of overruns since last status (in bytes) */
  71         unsigned char reserved[16];     /* reserved for future use */
  72 };
  73
  74 #define SNDRV_RAWMIDI_IOCTL_STATUS64    _IOWR('W', 0x20, struct snd_rawmidi_status64)
  75
  76 static struct snd_rawmidi *snd_rawmidi_search(struct snd_card *card, int device)
  77 {
  78         struct snd_rawmidi *rawmidi;
  79
  80         list_for_each_entry(rawmidi, &snd_rawmidi_devices, list)
  81                 if (rawmidi->card == card && rawmidi->device == device)
  82                         return rawmidi;
  83         return NULL;
  84 }
  85
  86 static inline unsigned short snd_rawmidi_file_flags(struct file *file)
  87 {
  88         switch (file->f_mode & (FMODE_READ | FMODE_WRITE)) {
  89         case FMODE_WRITE:
  90                 return SNDRV_RAWMIDI_LFLG_OUTPUT;
  91         case FMODE_READ:
  92                 return SNDRV_RAWMIDI_LFLG_INPUT;
  93         default:
  94                 return SNDRV_RAWMIDI_LFLG_OPEN;
  95         }
  96 }
  97
  98 static inline bool __snd_rawmidi_ready(struct snd_rawmidi_runtime *runtime)
  99 {
 100         return runtime->avail >= runtime->avail_min;
 101 }
 102
 103 static bool snd_rawmidi_ready(struct snd_rawmidi_substream *substream)
 104 {
 105         struct snd_rawmidi_runtime *runtime = substream->runtime;
 106         unsigned long flags;
 107         bool ready;
 108
 109         spin_lock_irqsave(&runtime->lock, flags);
 110         ready = __snd_rawmidi_ready(runtime);
 111         spin_unlock_irqrestore(&runtime->lock, flags);
 112         return ready;
 113 }
 114
 115 static inline int snd_rawmidi_ready_append(struct snd_rawmidi_substream *substream,
 116                                            size_t count)
 117 {
 118         struct snd_rawmidi_runtime *runtime = substream->runtime;
 119
 120         return runtime->avail >= runtime->avail_min &&
 121                (!substream->append || runtime->avail >= count);
 122 }
 123
 124 static void snd_rawmidi_input_event_work(struct work_struct *work)
 125 {
 126         struct snd_rawmidi_runtime *runtime =
 127                 container_of(work, struct snd_rawmidi_runtime, event_work);
 128
 129         if (runtime->event)
 130                 runtime->event(runtime->substream);
 131 }
 132
 133 /* buffer refcount management: call with runtime->lock held */
 134 static inline void snd_rawmidi_buffer_ref(struct snd_rawmidi_runtime *runtime)
 135 {
 136         runtime->buffer_ref++;
 137 }
 138
 139 static inline void snd_rawmidi_buffer_unref(struct snd_rawmidi_runtime *runtime)
 140 {
 141         runtime->buffer_ref--;
 142 }
 143
 144 static int snd_rawmidi_runtime_create(struct snd_rawmidi_substream *substream)
 145 {
 146         struct snd_rawmidi_runtime *runtime;
 147
 148         runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
 149         if (!runtime)
 150                 return -ENOMEM;
 151         runtime->substream = substream;
 152         spin_lock_init(&runtime->lock);
 153         init_waitqueue_head(&runtime->sleep);
 154         INIT_WORK(&runtime->event_work, snd_rawmidi_input_event_work);
 155         runtime->event = NULL;
 156         runtime->buffer_size = PAGE_SIZE;
 157         runtime->avail_min = 1;
 158         if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
 159                 runtime->avail = 0;
 160         else
 161                 runtime->avail = runtime->buffer_size;
 162         runtime->buffer = kvzalloc(runtime->buffer_size, GFP_KERNEL);
 163         if (!runtime->buffer) {
 164                 kfree(runtime);
 165                 return -ENOMEM;
 166         }
 167         runtime->appl_ptr = runtime->hw_ptr = 0;
 168         substream->runtime = runtime;
 169         return 0;
 170 }
 171
 172 static int snd_rawmidi_runtime_free(struct snd_rawmidi_substream *substream)
 173 {
 174         struct snd_rawmidi_runtime *runtime = substream->runtime;
 175
 176         kvfree(runtime->buffer);
 177         kfree(runtime);
 178         substream->runtime = NULL;
 179         return 0;
 180 }
 181
 182 static inline void snd_rawmidi_output_trigger(struct snd_rawmidi_substream *substream, int up)
 183 {
 184         if (!substream->opened)
 185                 return;
 186         substream->ops->trigger(substream, up);
 187 }
 188
 189 static void snd_rawmidi_input_trigger(struct snd_rawmidi_substream *substream, int up)
 190 {
 191         if (!substream->opened)
 192                 return;
 193         substream->ops->trigger(substream, up);
 194         if (!up)
 195                 cancel_work_sync(&substream->runtime->event_work);
 196 }
 197
 198 static void __reset_runtime_ptrs(struct snd_rawmidi_runtime *runtime,
 199                                  bool is_input)
 200 {
 201         runtime->drain = 0;
 202         runtime->appl_ptr = runtime->hw_ptr = 0;
 203         runtime->avail = is_input ? 0 : runtime->buffer_size;
 204 }
 205
 206 static void reset_runtime_ptrs(struct snd_rawmidi_runtime *runtime,
 207                                bool is_input)
 208 {
 209         unsigned long flags;
 210
 211         spin_lock_irqsave(&runtime->lock, flags);
 212         __reset_runtime_ptrs(runtime, is_input);
 213         spin_unlock_irqrestore(&runtime->lock, flags);
 214 }
 215
 216 int snd_rawmidi_drop_output(struct snd_rawmidi_substream *substream)
 217 {
 218         snd_rawmidi_output_trigger(substream, 0);
 219         reset_runtime_ptrs(substream->runtime, false);
 220         return 0;
 221 }
 222 EXPORT_SYMBOL(snd_rawmidi_drop_output);
 223
 224 int snd_rawmidi_drain_output(struct snd_rawmidi_substream *substream)
 225 {
 226         int err;
 227         long timeout;
 228         struct snd_rawmidi_runtime *runtime = substream->runtime;
 229
 230         err = 0;
 231         runtime->drain = 1;
 232         timeout = wait_event_interruptible_timeout(runtime->sleep,
 233                                 (runtime->avail >= runtime->buffer_size),
 234                                 10*HZ);
 235         if (signal_pending(current))
 236                 err = -ERESTARTSYS;
 237         if (runtime->avail < runtime->buffer_size && !timeout) {
 238                 rmidi_warn(substream->rmidi,
 239                            "rawmidi drain error (avail = %li, buffer_size = %li)\n",
 240                            (long)runtime->avail, (long)runtime->buffer_size);
 241                 err = -EIO;
 242         }
 243         runtime->drain = 0;
 244         if (err != -ERESTARTSYS) {
 245                 /* we need wait a while to make sure that Tx FIFOs are empty */
 246                 if (substream->ops->drain)
 247                         substream->ops->drain(substream);
 248                 else
 249                         msleep(50);
 250                 snd_rawmidi_drop_output(substream);
 251         }
 252         return err;
 253 }
 254 EXPORT_SYMBOL(snd_rawmidi_drain_output);
 255
 256 int snd_rawmidi_drain_input(struct snd_rawmidi_substream *substream)
 257 {
 258         snd_rawmidi_input_trigger(substream, 0);
 259         reset_runtime_ptrs(substream->runtime, true);
 260         return 0;
 261 }
 262 EXPORT_SYMBOL(snd_rawmidi_drain_input);
 263
 264 /* look for an available substream for the given stream direction;
 265  * if a specific subdevice is given, try to assign it
 266  */
 267 static int assign_substream(struct snd_rawmidi *rmidi, int subdevice,
 268                             int stream, int mode,
 269                             struct snd_rawmidi_substream **sub_ret)
 270 {
 271         struct snd_rawmidi_substream *substream;
 272         struct snd_rawmidi_str *s = &rmidi->streams[stream];
 273         static const unsigned int info_flags[2] = {
 274                 [SNDRV_RAWMIDI_STREAM_OUTPUT] = SNDRV_RAWMIDI_INFO_OUTPUT,
 275                 [SNDRV_RAWMIDI_STREAM_INPUT] = SNDRV_RAWMIDI_INFO_INPUT,
 276         };
 277
 278         if (!(rmidi->info_flags & info_flags[stream]))
 279                 return -ENXIO;
 280         if (subdevice >= 0 && subdevice >= s->substream_count)
 281                 return -ENODEV;
 282
 283         list_for_each_entry(substream, &s->substreams, list) {
 284                 if (substream->opened) {
 285                         if (stream == SNDRV_RAWMIDI_STREAM_INPUT ||
 286                             !(mode & SNDRV_RAWMIDI_LFLG_APPEND) ||
 287                             !substream->append)
 288                                 continue;
 289                 }
 290                 if (subdevice < 0 || subdevice == substream->number) {
 291                         *sub_ret = substream;
 292                         return 0;
 293                 }
 294         }
 295         return -EAGAIN;
 296 }
 297
 298 /* open and do ref-counting for the given substream */
 299 static int open_substream(struct snd_rawmidi *rmidi,
 300                           struct snd_rawmidi_substream *substream,
 301                           int mode)
 302 {
 303         int err;
 304
 305         if (substream->use_count == 0) {
 306                 err = snd_rawmidi_runtime_create(substream);
 307                 if (err < 0)
 308                         return err;
 309                 err = substream->ops->open(substream);
 310                 if (err < 0) {
 311                         snd_rawmidi_runtime_free(substream);
 312                         return err;
 313                 }
 314                 substream->opened = 1;
 315                 substream->active_sensing = 0;
 316                 if (mode & SNDRV_RAWMIDI_LFLG_APPEND)
 317                         substream->append = 1;
 318                 substream->pid = get_pid(task_pid(current));
 319                 rmidi->streams[substream->stream].substream_opened++;
 320         }
 321         substream->use_count++;
 322         return 0;
 323 }
 324
 325 static void close_substream(struct snd_rawmidi *rmidi,
 326                             struct snd_rawmidi_substream *substream,
 327                             int cleanup);
 328
 329 static int rawmidi_open_priv(struct snd_rawmidi *rmidi, int subdevice, int mode,
 330                              struct snd_rawmidi_file *rfile)
 331 {
 332         struct snd_rawmidi_substream *sinput = NULL, *soutput = NULL;
 333         int err;
 334
 335         rfile->input = rfile->output = NULL;
 336         if (mode & SNDRV_RAWMIDI_LFLG_INPUT) {
 337                 err = assign_substream(rmidi, subdevice,
 338                                        SNDRV_RAWMIDI_STREAM_INPUT,
 339                                        mode, &sinput);
 340                 if (err < 0)
 341                         return err;
 342         }
 343         if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) {
 344                 err = assign_substream(rmidi, subdevice,
 345                                        SNDRV_RAWMIDI_STREAM_OUTPUT,
 346                                        mode, &soutput);
 347                 if (err < 0)
 348                         return err;
 349         }
 350
 351         if (sinput) {
 352                 err = open_substream(rmidi, sinput, mode);
 353                 if (err < 0)
 354                         return err;
 355         }
 356         if (soutput) {
 357                 err = open_substream(rmidi, soutput, mode);
 358                 if (err < 0) {
 359                         if (sinput)
 360                                 close_substream(rmidi, sinput, 0);
 361                         return err;
 362                 }
 363         }
 364
 365         rfile->rmidi = rmidi;
 366         rfile->input = sinput;
 367         rfile->output = soutput;
 368         return 0;
 369 }
 370
 371 /* called from sound/core/seq/seq_midi.c */
 372 int snd_rawmidi_kernel_open(struct snd_card *card, int device, int subdevice,
 373                             int mode, struct snd_rawmidi_file *rfile)
 374 {
 375         struct snd_rawmidi *rmidi;
 376         int err = 0;
 377
 378         if (snd_BUG_ON(!rfile))
 379                 return -EINVAL;
 380
 381         mutex_lock(&register_mutex);
 382         rmidi = snd_rawmidi_search(card, device);
 383         if (!rmidi)
 384                 err = -ENODEV;
 385         else if (!try_module_get(rmidi->card->module))
 386                 err = -ENXIO;
 387         mutex_unlock(&register_mutex);
 388         if (err < 0)
 389                 return err;
 390
 391         mutex_lock(&rmidi->open_mutex);
 392         err = rawmidi_open_priv(rmidi, subdevice, mode, rfile);
 393         mutex_unlock(&rmidi->open_mutex);
 394         if (err < 0)
 395                 module_put(rmidi->card->module);
 396         return err;
 397 }
 398 EXPORT_SYMBOL(snd_rawmidi_kernel_open);
 399
 400 static int snd_rawmidi_open(struct inode *inode, struct file *file)
 401 {
 402         int maj = imajor(inode);
 403         struct snd_card *card;
 404         int subdevice;
 405         unsigned short fflags;
 406         int err;
 407         struct snd_rawmidi *rmidi;
 408         struct snd_rawmidi_file *rawmidi_file = NULL;
 409         wait_queue_entry_t wait;
 410
 411         if ((file->f_flags & O_APPEND) && !(file->f_flags & O_NONBLOCK))
 412                 return -EINVAL;         /* invalid combination */
 413
 414         err = stream_open(inode, file);
 415         if (err < 0)
 416                 return err;
 417
 418         if (maj == snd_major) {
 419                 rmidi = snd_lookup_minor_data(iminor(inode),
 420                                               SNDRV_DEVICE_TYPE_RAWMIDI);
 421 #ifdef CONFIG_SND_OSSEMUL
 422         } else if (maj == SOUND_MAJOR) {
 423                 rmidi = snd_lookup_oss_minor_data(iminor(inode),
 424                                                   SNDRV_OSS_DEVICE_TYPE_MIDI);
 425 #endif
 426         } else
 427                 return -ENXIO;
 428
 429         if (rmidi == NULL)
 430                 return -ENODEV;
 431
 432         if (!try_module_get(rmidi->card->module)) {
 433                 snd_card_unref(rmidi->card);
 434                 return -ENXIO;
 435         }
 436
 437         mutex_lock(&rmidi->open_mutex);
 438         card = rmidi->card;
 439         err = snd_card_file_add(card, file);
 440         if (err < 0)
 441                 goto __error_card;
 442         fflags = snd_rawmidi_file_flags(file);
 443         if ((file->f_flags & O_APPEND) || maj == SOUND_MAJOR) /* OSS emul? */
 444                 fflags |= SNDRV_RAWMIDI_LFLG_APPEND;
 445         rawmidi_file = kmalloc(sizeof(*rawmidi_file), GFP_KERNEL);
 446         if (rawmidi_file == NULL) {
 447                 err = -ENOMEM;
 448                 goto __error;
 449         }
 450         rawmidi_file->user_pversion = 0;
 451         init_waitqueue_entry(&wait, current);
 452         add_wait_queue(&rmidi->open_wait, &wait);
 453         while (1) {
 454                 subdevice = snd_ctl_get_preferred_subdevice(card, SND_CTL_SUBDEV_RAWMIDI);
 455                 err = rawmidi_open_priv(rmidi, subdevice, fflags, rawmidi_file);
 456                 if (err >= 0)
 457                         break;
 458                 if (err == -EAGAIN) {
 459                         if (file->f_flags & O_NONBLOCK) {
 460                                 err = -EBUSY;
 461                                 break;
 462                         }
 463                 } else
 464                         break;
 465                 set_current_state(TASK_INTERRUPTIBLE);
 466                 mutex_unlock(&rmidi->open_mutex);
 467                 schedule();
 468                 mutex_lock(&rmidi->open_mutex);
 469                 if (rmidi->card->shutdown) {
 470                         err = -ENODEV;
 471                         break;
 472                 }
 473                 if (signal_pending(current)) {
 474                         err = -ERESTARTSYS;
 475                         break;
 476                 }
 477         }
 478         remove_wait_queue(&rmidi->open_wait, &wait);
 479         if (err < 0) {
 480                 kfree(rawmidi_file);
 481                 goto __error;
 482         }
 483 #ifdef CONFIG_SND_OSSEMUL
 484         if (rawmidi_file->input && rawmidi_file->input->runtime)
 485                 rawmidi_file->input->runtime->oss = (maj == SOUND_MAJOR);
 486         if (rawmidi_file->output && rawmidi_file->output->runtime)
 487                 rawmidi_file->output->runtime->oss = (maj == SOUND_MAJOR);
 488 #endif
 489         file->private_data = rawmidi_file;
 490         mutex_unlock(&rmidi->open_mutex);
 491         snd_card_unref(rmidi->card);
 492         return 0;
 493
 494  __error:
 495         snd_card_file_remove(card, file);
 496  __error_card:
 497         mutex_unlock(&rmidi->open_mutex);
 498         module_put(rmidi->card->module);
 499         snd_card_unref(rmidi->card);
 500         return err;
 501 }
 502
 503 static void close_substream(struct snd_rawmidi *rmidi,
 504                             struct snd_rawmidi_substream *substream,
 505                             int cleanup)
 506 {
 507         if (--substream->use_count)
 508                 return;
 509
 510         if (cleanup) {
 511                 if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
 512                         snd_rawmidi_input_trigger(substream, 0);
 513                 else {
 514                         if (substream->active_sensing) {
 515                                 unsigned char buf = 0xfe;
 516                                 /* sending single active sensing message
 517                                  * to shut the device up
 518                                  */
 519                                 snd_rawmidi_kernel_write(substream, &buf, 1);
 520                         }
 521                         if (snd_rawmidi_drain_output(substream) == -ERESTARTSYS)
 522                                 snd_rawmidi_output_trigger(substream, 0);
 523                 }
 524         }
 525         substream->ops->close(substream);
 526         if (substream->runtime->private_free)
 527                 substream->runtime->private_free(substream);
 528         snd_rawmidi_runtime_free(substream);
 529         substream->opened = 0;
 530         substream->append = 0;
 531         put_pid(substream->pid);
 532         substream->pid = NULL;
 533         rmidi->streams[substream->stream].substream_opened--;
 534 }
 535
 536 static void rawmidi_release_priv(struct snd_rawmidi_file *rfile)
 537 {
 538         struct snd_rawmidi *rmidi;
 539
 540         rmidi = rfile->rmidi;
 541         mutex_lock(&rmidi->open_mutex);
 542         if (rfile->input) {
 543                 close_substream(rmidi, rfile->input, 1);
 544                 rfile->input = NULL;
 545         }
 546         if (rfile->output) {
 547                 close_substream(rmidi, rfile->output, 1);
 548                 rfile->output = NULL;
 549         }
 550         rfile->rmidi = NULL;
 551         mutex_unlock(&rmidi->open_mutex);
 552         wake_up(&rmidi->open_wait);
 553 }
 554
 555 /* called from sound/core/seq/seq_midi.c */
 556 int snd_rawmidi_kernel_release(struct snd_rawmidi_file *rfile)
 557 {
 558         struct snd_rawmidi *rmidi;
 559
 560         if (snd_BUG_ON(!rfile))
 561                 return -ENXIO;
 562
 563         rmidi = rfile->rmidi;
 564         rawmidi_release_priv(rfile);
 565         module_put(rmidi->card->module);
 566         return 0;
 567 }
 568 EXPORT_SYMBOL(snd_rawmidi_kernel_release);
 569
 570 static int snd_rawmidi_release(struct inode *inode, struct file *file)
 571 {
 572         struct snd_rawmidi_file *rfile;
 573         struct snd_rawmidi *rmidi;
 574         struct module *module;
 575
 576         rfile = file->private_data;
 577         rmidi = rfile->rmidi;
 578         rawmidi_release_priv(rfile);
 579         kfree(rfile);
 580         module = rmidi->card->module;
 581         snd_card_file_remove(rmidi->card, file);
 582         module_put(module);
 583         return 0;
 584 }
 585
 586 static int snd_rawmidi_info(struct snd_rawmidi_substream *substream,
 587                             struct snd_rawmidi_info *info)
 588 {
 589         struct snd_rawmidi *rmidi;
 590
 591         if (substream == NULL)
 592                 return -ENODEV;
 593         rmidi = substream->rmidi;
 594         memset(info, 0, sizeof(*info));
 595         info->card = rmidi->card->number;
 596         info->device = rmidi->device;
 597         info->subdevice = substream->number;
 598         info->stream = substream->stream;
 599         info->flags = rmidi->info_flags;
 600         strcpy(info->id, rmidi->id);
 601         strcpy(info->name, rmidi->name);
 602         strcpy(info->subname, substream->name);
 603         info->subdevices_count = substream->pstr->substream_count;
 604         info->subdevices_avail = (substream->pstr->substream_count -
 605                                   substream->pstr->substream_opened);
 606         return 0;
 607 }
 608
 609 static int snd_rawmidi_info_user(struct snd_rawmidi_substream *substream,
 610                                  struct snd_rawmidi_info __user *_info)
 611 {
 612         struct snd_rawmidi_info info;
 613         int err;
 614
 615         err = snd_rawmidi_info(substream, &info);
 616         if (err < 0)
 617                 return err;
 618         if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
 619                 return -EFAULT;
 620         return 0;
 621 }
 622
 623 static int __snd_rawmidi_info_select(struct snd_card *card,
 624                                      struct snd_rawmidi_info *info)
 625 {
 626         struct snd_rawmidi *rmidi;
 627         struct snd_rawmidi_str *pstr;
 628         struct snd_rawmidi_substream *substream;
 629
 630         rmidi = snd_rawmidi_search(card, info->device);
 631         if (!rmidi)
 632                 return -ENXIO;
 633         if (info->stream < 0 || info->stream > 1)
 634                 return -EINVAL;
 635         info->stream = array_index_nospec(info->stream, 2);
 636         pstr = &rmidi->streams[info->stream];
 637         if (pstr->substream_count == 0)
 638                 return -ENOENT;
 639         if (info->subdevice >= pstr->substream_count)
 640                 return -ENXIO;
 641         list_for_each_entry(substream, &pstr->substreams, list) {
 642                 if ((unsigned int)substream->number == info->subdevice)
 643                         return snd_rawmidi_info(substream, info);
 644         }
 645         return -ENXIO;
 646 }
 647
 648 int snd_rawmidi_info_select(struct snd_card *card, struct snd_rawmidi_info *info)
 649 {
 650         int ret;
 651
 652         mutex_lock(&register_mutex);
 653         ret = __snd_rawmidi_info_select(card, info);
 654         mutex_unlock(&register_mutex);
 655         return ret;
 656 }
 657 EXPORT_SYMBOL(snd_rawmidi_info_select);
 658
 659 static int snd_rawmidi_info_select_user(struct snd_card *card,
 660                                         struct snd_rawmidi_info __user *_info)
 661 {
 662         int err;
 663         struct snd_rawmidi_info info;
 664
 665         if (get_user(info.device, &_info->device))
 666                 return -EFAULT;
 667         if (get_user(info.stream, &_info->stream))
 668                 return -EFAULT;
 669         if (get_user(info.subdevice, &_info->subdevice))
 670                 return -EFAULT;
 671         err = snd_rawmidi_info_select(card, &info);
 672         if (err < 0)
 673                 return err;
 674         if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
 675                 return -EFAULT;
 676         return 0;
 677 }
 678
 679 static int resize_runtime_buffer(struct snd_rawmidi_runtime *runtime,
 680                                  struct snd_rawmidi_params *params,
 681                                  bool is_input)
 682 {
 683         char *newbuf, *oldbuf;
 684         unsigned int framing = params->mode & SNDRV_RAWMIDI_MODE_FRAMING_MASK;
 685
 686         if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L)
 687                 return -EINVAL;
 688         if (framing == SNDRV_RAWMIDI_MODE_FRAMING_TSTAMP && (params->buffer_size & 0x1f) != 0)
 689                 return -EINVAL;
 690         if (params->avail_min < 1 || params->avail_min > params->buffer_size)
 691                 return -EINVAL;
 692         if (params->buffer_size != runtime->buffer_size) {
 693                 newbuf = kvzalloc(params->buffer_size, GFP_KERNEL);
 694                 if (!newbuf)
 695                         return -ENOMEM;
 696                 spin_lock_irq(&runtime->lock);
 697                 if (runtime->buffer_ref) {
 698                         spin_unlock_irq(&runtime->lock);
 699                         kvfree(newbuf);
 700                         return -EBUSY;
 701                 }
 702                 oldbuf = runtime->buffer;
 703                 runtime->buffer = newbuf;
 704                 runtime->buffer_size = params->buffer_size;
 705                 __reset_runtime_ptrs(runtime, is_input);
 706                 spin_unlock_irq(&runtime->lock);
 707                 kvfree(oldbuf);
 708         }
 709         runtime->avail_min = params->avail_min;
 710         return 0;
 711 }
 712
 713 int snd_rawmidi_output_params(struct snd_rawmidi_substream *substream,
 714                               struct snd_rawmidi_params *params)
 715 {
 716         if (substream->append && substream->use_count > 1)
 717                 return -EBUSY;
 718         snd_rawmidi_drain_output(substream);
 719         substream->active_sensing = !params->no_active_sensing;
 720         return resize_runtime_buffer(substream->runtime, params, false);
 721 }
 722 EXPORT_SYMBOL(snd_rawmidi_output_params);
 723
 724 int snd_rawmidi_input_params(struct snd_rawmidi_substream *substream,
 725                              struct snd_rawmidi_params *params)
 726 {
 727         unsigned int framing = params->mode & SNDRV_RAWMIDI_MODE_FRAMING_MASK;
 728         unsigned int clock_type = params->mode & SNDRV_RAWMIDI_MODE_CLOCK_MASK;
 729         int err;
 730
 731         if (framing == SNDRV_RAWMIDI_MODE_FRAMING_NONE && clock_type != SNDRV_RAWMIDI_MODE_CLOCK_NONE)
 732                 return -EINVAL;
 733         else if (clock_type > SNDRV_RAWMIDI_MODE_CLOCK_MONOTONIC_RAW)
 734                 return -EINVAL;
 735         if (framing > SNDRV_RAWMIDI_MODE_FRAMING_TSTAMP)
 736                 return -EINVAL;
 737         snd_rawmidi_drain_input(substream);
 738         err = resize_runtime_buffer(substream->runtime, params, true);
 739         if (err < 0)
 740                 return err;
 741
 742         substream->framing = framing;
 743         substream->clock_type = clock_type;
 744         return 0;
 745 }
 746 EXPORT_SYMBOL(snd_rawmidi_input_params);
 747
 748 static int snd_rawmidi_output_status(struct snd_rawmidi_substream *substream,
 749                                      struct snd_rawmidi_status64 *status)
 750 {
 751         struct snd_rawmidi_runtime *runtime = substream->runtime;
 752
 753         memset(status, 0, sizeof(*status));
 754         status->stream = SNDRV_RAWMIDI_STREAM_OUTPUT;
 755         spin_lock_irq(&runtime->lock);
 756         status->avail = runtime->avail;
 757         spin_unlock_irq(&runtime->lock);
 758         return 0;
 759 }
 760
 761 static int snd_rawmidi_input_status(struct snd_rawmidi_substream *substream,
 762                                     struct snd_rawmidi_status64 *status)
 763 {
 764         struct snd_rawmidi_runtime *runtime = substream->runtime;
 765
 766         memset(status, 0, sizeof(*status));
 767         status->stream = SNDRV_RAWMIDI_STREAM_INPUT;
 768         spin_lock_irq(&runtime->lock);
 769         status->avail = runtime->avail;
 770         status->xruns = runtime->xruns;
 771         runtime->xruns = 0;
 772         spin_unlock_irq(&runtime->lock);
 773         return 0;
 774 }
 775
 776 static int snd_rawmidi_ioctl_status32(struct snd_rawmidi_file *rfile,
 777                                       struct snd_rawmidi_status32 __user *argp)
 778 {
 779         int err = 0;
 780         struct snd_rawmidi_status32 __user *status = argp;
 781         struct snd_rawmidi_status32 status32;
 782         struct snd_rawmidi_status64 status64;
 783
 784         if (copy_from_user(&status32, argp,
 785                            sizeof(struct snd_rawmidi_status32)))
 786                 return -EFAULT;
 787
 788         switch (status32.stream) {
 789         case SNDRV_RAWMIDI_STREAM_OUTPUT:
 790                 if (rfile->output == NULL)
 791                         return -EINVAL;
 792                 err = snd_rawmidi_output_status(rfile->output, &status64);
 793                 break;
 794         case SNDRV_RAWMIDI_STREAM_INPUT:
 795                 if (rfile->input == NULL)
 796                         return -EINVAL;
 797                 err = snd_rawmidi_input_status(rfile->input, &status64);
 798                 break;
 799         default:
 800                 return -EINVAL;
 801         }
 802         if (err < 0)
 803                 return err;
 804
 805         status32 = (struct snd_rawmidi_status32) {
 806                 .stream = status64.stream,
 807                 .tstamp_sec = status64.tstamp_sec,
 808                 .tstamp_nsec = status64.tstamp_nsec,
 809                 .avail = status64.avail,
 810                 .xruns = status64.xruns,
 811         };
 812
 813         if (copy_to_user(status, &status32, sizeof(*status)))
 814                 return -EFAULT;
 815
 816         return 0;
 817 }
 818
 819 static int snd_rawmidi_ioctl_status64(struct snd_rawmidi_file *rfile,
 820                                       struct snd_rawmidi_status64 __user *argp)
 821 {
 822         int err = 0;
 823         struct snd_rawmidi_status64 status;
 824
 825         if (copy_from_user(&status, argp, sizeof(struct snd_rawmidi_status64)))
 826                 return -EFAULT;
 827
 828         switch (status.stream) {
 829         case SNDRV_RAWMIDI_STREAM_OUTPUT:
 830                 if (rfile->output == NULL)
 831                         return -EINVAL;
 832                 err = snd_rawmidi_output_status(rfile->output, &status);
 833                 break;
 834         case SNDRV_RAWMIDI_STREAM_INPUT:
 835                 if (rfile->input == NULL)
 836                         return -EINVAL;
 837                 err = snd_rawmidi_input_status(rfile->input, &status);
 838                 break;
 839         default:
 840                 return -EINVAL;
 841         }
 842         if (err < 0)
 843                 return err;
 844         if (copy_to_user(argp, &status,
 845                          sizeof(struct snd_rawmidi_status64)))
 846                 return -EFAULT;
 847         return 0;
 848 }
 849
 850 static long snd_rawmidi_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 851 {
 852         struct snd_rawmidi_file *rfile;
 853         void __user *argp = (void __user *)arg;
 854
 855         rfile = file->private_data;
 856         if (((cmd >> 8) & 0xff) != 'W')
 857                 return -ENOTTY;
 858         switch (cmd) {
 859         case SNDRV_RAWMIDI_IOCTL_PVERSION:
 860                 return put_user(SNDRV_RAWMIDI_VERSION, (int __user *)argp) ? -EFAULT : 0;
 861         case SNDRV_RAWMIDI_IOCTL_INFO:
 862         {
 863                 int stream;
 864                 struct snd_rawmidi_info __user *info = argp;
 865
 866                 if (get_user(stream, &info->stream))
 867                         return -EFAULT;
 868                 switch (stream) {
 869                 case SNDRV_RAWMIDI_STREAM_INPUT:
 870                         return snd_rawmidi_info_user(rfile->input, info);
 871                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
 872                         return snd_rawmidi_info_user(rfile->output, info);
 873                 default:
 874                         return -EINVAL;
 875                 }
 876         }
 877         case SNDRV_RAWMIDI_IOCTL_USER_PVERSION:
 878                 if (get_user(rfile->user_pversion, (unsigned int __user *)arg))
 879                         return -EFAULT;
 880                 return 0;
 881
 882         case SNDRV_RAWMIDI_IOCTL_PARAMS:
 883         {
 884                 struct snd_rawmidi_params params;
 885
 886                 if (copy_from_user(&params, argp, sizeof(struct snd_rawmidi_params)))
 887                         return -EFAULT;
 888                 if (rfile->user_pversion < SNDRV_PROTOCOL_VERSION(2, 0, 2)) {
 889                         params.mode = 0;
 890                         memset(params.reserved, 0, sizeof(params.reserved));
 891                 }
 892                 switch (params.stream) {
 893                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
 894                         if (rfile->output == NULL)
 895                                 return -EINVAL;
 896                         return snd_rawmidi_output_params(rfile->output, &params);
 897                 case SNDRV_RAWMIDI_STREAM_INPUT:
 898                         if (rfile->input == NULL)
 899                                 return -EINVAL;
 900                         return snd_rawmidi_input_params(rfile->input, &params);
 901                 default:
 902                         return -EINVAL;
 903                 }
 904         }
 905         case SNDRV_RAWMIDI_IOCTL_STATUS32:
 906                 return snd_rawmidi_ioctl_status32(rfile, argp);
 907         case SNDRV_RAWMIDI_IOCTL_STATUS64:
 908                 return snd_rawmidi_ioctl_status64(rfile, argp);
 909         case SNDRV_RAWMIDI_IOCTL_DROP:
 910         {
 911                 int val;
 912
 913                 if (get_user(val, (int __user *) argp))
 914                         return -EFAULT;
 915                 switch (val) {
 916                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
 917                         if (rfile->output == NULL)
 918                                 return -EINVAL;
 919                         return snd_rawmidi_drop_output(rfile->output);
 920                 default:
 921                         return -EINVAL;
 922                 }
 923         }
 924         case SNDRV_RAWMIDI_IOCTL_DRAIN:
 925         {
 926                 int val;
 927
 928                 if (get_user(val, (int __user *) argp))
 929                         return -EFAULT;
 930                 switch (val) {
 931                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
 932                         if (rfile->output == NULL)
 933                                 return -EINVAL;
 934                         return snd_rawmidi_drain_output(rfile->output);
 935                 case SNDRV_RAWMIDI_STREAM_INPUT:
 936                         if (rfile->input == NULL)
 937                                 return -EINVAL;
 938                         return snd_rawmidi_drain_input(rfile->input);
 939                 default:
 940                         return -EINVAL;
 941                 }
 942         }
 943         default:
 944                 rmidi_dbg(rfile->rmidi,
 945                           "rawmidi: unknown command = 0x%x\n", cmd);
 946         }
 947         return -ENOTTY;
 948 }
 949
 950 static int snd_rawmidi_control_ioctl(struct snd_card *card,
 951                                      struct snd_ctl_file *control,
 952                                      unsigned int cmd,
 953                                      unsigned long arg)
 954 {
 955         void __user *argp = (void __user *)arg;
 956
 957         switch (cmd) {
 958         case SNDRV_CTL_IOCTL_RAWMIDI_NEXT_DEVICE:
 959         {
 960                 int device;
 961
 962                 if (get_user(device, (int __user *)argp))
 963                         return -EFAULT;
 964                 if (device >= SNDRV_RAWMIDI_DEVICES) /* next device is -1 */
 965                         device = SNDRV_RAWMIDI_DEVICES - 1;
 966                 mutex_lock(&register_mutex);
 967                 device = device < 0 ? 0 : device + 1;
 968                 while (device < SNDRV_RAWMIDI_DEVICES) {
 969                         if (snd_rawmidi_search(card, device))
 970                                 break;
 971                         device++;
 972                 }
 973                 if (device == SNDRV_RAWMIDI_DEVICES)
 974                         device = -1;
 975                 mutex_unlock(&register_mutex);
 976                 if (put_user(device, (int __user *)argp))
 977                         return -EFAULT;
 978                 return 0;
 979         }
 980         case SNDRV_CTL_IOCTL_RAWMIDI_PREFER_SUBDEVICE:
 981         {
 982                 int val;
 983
 984                 if (get_user(val, (int __user *)argp))
 985                         return -EFAULT;
 986                 control->preferred_subdevice[SND_CTL_SUBDEV_RAWMIDI] = val;
 987                 return 0;
 988         }
 989         case SNDRV_CTL_IOCTL_RAWMIDI_INFO:
 990                 return snd_rawmidi_info_select_user(card, argp);
 991         }
 992         return -ENOIOCTLCMD;
 993 }
 994
 995 static int receive_with_tstamp_framing(struct snd_rawmidi_substream *substream,
 996                         const unsigned char *buffer, int src_count, const struct timespec64 *tstamp)
 997 {
 998         struct snd_rawmidi_runtime *runtime = substream->runtime;
 999         struct snd_rawmidi_framing_tstamp *dest_ptr;
1000         struct snd_rawmidi_framing_tstamp frame = { .tv_sec = tstamp->tv_sec, .tv_nsec = tstamp->tv_nsec };
1001         int dest_frames = 0;
1002         int orig_count = src_count;
1003         int frame_size = sizeof(struct snd_rawmidi_framing_tstamp);
1004
1005         BUILD_BUG_ON(frame_size != 0x20);
1006         if (snd_BUG_ON((runtime->hw_ptr & 0x1f) != 0))
1007                 return -EINVAL;
1008
1009         while (src_count > 0) {
1010                 if ((int)(runtime->buffer_size - runtime->avail) < frame_size) {
1011                         runtime->xruns += src_count;
1012                         break;
1013                 }
1014                 if (src_count >= SNDRV_RAWMIDI_FRAMING_DATA_LENGTH)
1015                         frame.length = SNDRV_RAWMIDI_FRAMING_DATA_LENGTH;
1016                 else {
1017                         frame.length = src_count;
1018                         memset(frame.data, 0, SNDRV_RAWMIDI_FRAMING_DATA_LENGTH);
1019                 }
1020                 memcpy(frame.data, buffer, frame.length);
1021                 buffer += frame.length;
1022                 src_count -= frame.length;
1023                 dest_ptr = (struct snd_rawmidi_framing_tstamp *) (runtime->buffer + runtime->hw_ptr);
1024                 *dest_ptr = frame;
1025                 runtime->avail += frame_size;
1026                 runtime->hw_ptr += frame_size;
1027                 runtime->hw_ptr %= runtime->buffer_size;
1028                 dest_frames++;
1029         }
1030         return orig_count - src_count;
1031 }
1032
1033 static struct timespec64 get_framing_tstamp(struct snd_rawmidi_substream *substream)
1034 {
1035         struct timespec64 ts64 = {0, 0};
1036
1037         switch (substream->clock_type) {
1038         case SNDRV_RAWMIDI_MODE_CLOCK_MONOTONIC_RAW:
1039                 ktime_get_raw_ts64(&ts64);
1040                 break;
1041         case SNDRV_RAWMIDI_MODE_CLOCK_MONOTONIC:
1042                 ktime_get_ts64(&ts64);
1043                 break;
1044         case SNDRV_RAWMIDI_MODE_CLOCK_REALTIME:
1045                 ktime_get_real_ts64(&ts64);
1046                 break;
1047         }
1048         return ts64;
1049 }
1050
1051 /**
1052  * snd_rawmidi_receive - receive the input data from the device
1053  * @substream: the rawmidi substream
1054  * @buffer: the buffer pointer
1055  * @count: the data size to read
1056  *
1057  * Reads the data from the internal buffer.
1058  *
1059  * Return: The size of read data, or a negative error code on failure.
1060  */
1061 int snd_rawmidi_receive(struct snd_rawmidi_substream *substream,
1062                         const unsigned char *buffer, int count)
1063 {
1064         unsigned long flags;
1065         struct timespec64 ts64 = get_framing_tstamp(substream);
1066         int result = 0, count1;
1067         struct snd_rawmidi_runtime *runtime = substream->runtime;
1068
1069         if (!substream->opened)
1070                 return -EBADFD;
1071         if (runtime->buffer == NULL) {
1072                 rmidi_dbg(substream->rmidi,
1073                           "snd_rawmidi_receive: input is not active!!!\n");
1074                 return -EINVAL;
1075         }
1076
1077         spin_lock_irqsave(&runtime->lock, flags);
1078         if (substream->framing == SNDRV_RAWMIDI_MODE_FRAMING_TSTAMP) {
1079                 result = receive_with_tstamp_framing(substream, buffer, count, &ts64);
1080         } else if (count == 1) {        /* special case, faster code */
1081                 substream->bytes++;
1082                 if (runtime->avail < runtime->buffer_size) {
1083                         runtime->buffer[runtime->hw_ptr++] = buffer[0];
1084                         runtime->hw_ptr %= runtime->buffer_size;
1085                         runtime->avail++;
1086                         result++;
1087                 } else {
1088                         runtime->xruns++;
1089                 }
1090         } else {
1091                 substream->bytes += count;
1092                 count1 = runtime->buffer_size - runtime->hw_ptr;
1093                 if (count1 > count)
1094                         count1 = count;
1095                 if (count1 > (int)(runtime->buffer_size - runtime->avail))
1096                         count1 = runtime->buffer_size - runtime->avail;
1097                 memcpy(runtime->buffer + runtime->hw_ptr, buffer, count1);
1098                 runtime->hw_ptr += count1;
1099                 runtime->hw_ptr %= runtime->buffer_size;
1100                 runtime->avail += count1;
1101                 count -= count1;
1102                 result += count1;
1103                 if (count > 0) {
1104                         buffer += count1;
1105                         count1 = count;
1106                         if (count1 > (int)(runtime->buffer_size - runtime->avail)) {
1107                                 count1 = runtime->buffer_size - runtime->avail;
1108                                 runtime->xruns += count - count1;
1109                         }
1110                         if (count1 > 0) {
1111                                 memcpy(runtime->buffer, buffer, count1);
1112                                 runtime->hw_ptr = count1;
1113                                 runtime->avail += count1;
1114                                 result += count1;
1115                         }
1116                 }
1117         }
1118         if (result > 0) {
1119                 if (runtime->event)
1120                         schedule_work(&runtime->event_work);
1121                 else if (__snd_rawmidi_ready(runtime))
1122                         wake_up(&runtime->sleep);
1123         }
1124         spin_unlock_irqrestore(&runtime->lock, flags);
1125         return result;
1126 }
1127 EXPORT_SYMBOL(snd_rawmidi_receive);
1128
1129 static long snd_rawmidi_kernel_read1(struct snd_rawmidi_substream *substream,
1130                                      unsigned char __user *userbuf,
1131                                      unsigned char *kernelbuf, long count)
1132 {
1133         unsigned long flags;
1134         long result = 0, count1;
1135         struct snd_rawmidi_runtime *runtime = substream->runtime;
1136         unsigned long appl_ptr;
1137         int err = 0;
1138
1139         spin_lock_irqsave(&runtime->lock, flags);
1140         snd_rawmidi_buffer_ref(runtime);
1141         while (count > 0 && runtime->avail) {
1142                 count1 = runtime->buffer_size - runtime->appl_ptr;
1143                 if (count1 > count)
1144                         count1 = count;
1145                 if (count1 > (int)runtime->avail)
1146                         count1 = runtime->avail;
1147
1148                 /* update runtime->appl_ptr before unlocking for userbuf */
1149                 appl_ptr = runtime->appl_ptr;
1150                 runtime->appl_ptr += count1;
1151                 runtime->appl_ptr %= runtime->buffer_size;
1152                 runtime->avail -= count1;
1153
1154                 if (kernelbuf)
1155                         memcpy(kernelbuf + result, runtime->buffer + appl_ptr, count1);
1156                 if (userbuf) {
1157                         spin_unlock_irqrestore(&runtime->lock, flags);
1158                         if (copy_to_user(userbuf + result,
1159                                          runtime->buffer + appl_ptr, count1))
1160                                 err = -EFAULT;
1161                         spin_lock_irqsave(&runtime->lock, flags);
1162                         if (err)
1163                                 goto out;
1164                 }
1165                 result += count1;
1166                 count -= count1;
1167         }
1168  out:
1169         snd_rawmidi_buffer_unref(runtime);
1170         spin_unlock_irqrestore(&runtime->lock, flags);
1171         return result > 0 ? result : err;
1172 }
1173
1174 long snd_rawmidi_kernel_read(struct snd_rawmidi_substream *substream,
1175                              unsigned char *buf, long count)
1176 {
1177         snd_rawmidi_input_trigger(substream, 1);
1178         return snd_rawmidi_kernel_read1(substream, NULL/*userbuf*/, buf, count);
1179 }
1180 EXPORT_SYMBOL(snd_rawmidi_kernel_read);
1181
1182 static ssize_t snd_rawmidi_read(struct file *file, char __user *buf, size_t count,
1183                                 loff_t *offset)
1184 {
1185         long result;
1186         int count1;
1187         struct snd_rawmidi_file *rfile;
1188         struct snd_rawmidi_substream *substream;
1189         struct snd_rawmidi_runtime *runtime;
1190
1191         rfile = file->private_data;
1192         substream = rfile->input;
1193         if (substream == NULL)
1194                 return -EIO;
1195         runtime = substream->runtime;
1196         snd_rawmidi_input_trigger(substream, 1);
1197         result = 0;
1198         while (count > 0) {
1199                 spin_lock_irq(&runtime->lock);
1200                 while (!__snd_rawmidi_ready(runtime)) {
1201                         wait_queue_entry_t wait;
1202
1203                         if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1204                                 spin_unlock_irq(&runtime->lock);
1205                                 return result > 0 ? result : -EAGAIN;
1206                         }
1207                         init_waitqueue_entry(&wait, current);
1208                         add_wait_queue(&runtime->sleep, &wait);
1209                         set_current_state(TASK_INTERRUPTIBLE);
1210                         spin_unlock_irq(&runtime->lock);
1211                         schedule();
1212                         remove_wait_queue(&runtime->sleep, &wait);
1213                         if (rfile->rmidi->card->shutdown)
1214                                 return -ENODEV;
1215                         if (signal_pending(current))
1216                                 return result > 0 ? result : -ERESTARTSYS;
1217                         spin_lock_irq(&runtime->lock);
1218                         if (!runtime->avail) {
1219                                 spin_unlock_irq(&runtime->lock);
1220                                 return result > 0 ? result : -EIO;
1221                         }
1222                 }
1223                 spin_unlock_irq(&runtime->lock);
1224                 count1 = snd_rawmidi_kernel_read1(substream,
1225                                                   (unsigned char __user *)buf,
1226                                                   NULL/*kernelbuf*/,
1227                                                   count);
1228                 if (count1 < 0)
1229                         return result > 0 ? result : count1;
1230                 result += count1;
1231                 buf += count1;
1232                 count -= count1;
1233         }
1234         return result;
1235 }
1236
1237 /**
1238  * snd_rawmidi_transmit_empty - check whether the output buffer is empty
1239  * @substream: the rawmidi substream
1240  *
1241  * Return: 1 if the internal output buffer is empty, 0 if not.
1242  */
1243 int snd_rawmidi_transmit_empty(struct snd_rawmidi_substream *substream)
1244 {
1245         struct snd_rawmidi_runtime *runtime = substream->runtime;
1246         int result;
1247         unsigned long flags;
1248
1249         if (runtime->buffer == NULL) {
1250                 rmidi_dbg(substream->rmidi,
1251                           "snd_rawmidi_transmit_empty: output is not active!!!\n");
1252                 return 1;
1253         }
1254         spin_lock_irqsave(&runtime->lock, flags);
1255         result = runtime->avail >= runtime->buffer_size;
1256         spin_unlock_irqrestore(&runtime->lock, flags);
1257         return result;
1258 }
1259 EXPORT_SYMBOL(snd_rawmidi_transmit_empty);
1260
1261 /*
1262  * __snd_rawmidi_transmit_peek - copy data from the internal buffer
1263  * @substream: the rawmidi substream
1264  * @buffer: the buffer pointer
1265  * @count: data size to transfer
1266  *
1267  * This is a variant of snd_rawmidi_transmit_peek() without spinlock.
1268  */
1269 static int __snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
1270                                        unsigned char *buffer, int count)
1271 {
1272         int result, count1;
1273         struct snd_rawmidi_runtime *runtime = substream->runtime;
1274
1275         if (runtime->buffer == NULL) {
1276                 rmidi_dbg(substream->rmidi,
1277                           "snd_rawmidi_transmit_peek: output is not active!!!\n");
1278                 return -EINVAL;
1279         }
1280         result = 0;
1281         if (runtime->avail >= runtime->buffer_size) {
1282                 /* warning: lowlevel layer MUST trigger down the hardware */
1283                 goto __skip;
1284         }
1285         if (count == 1) {       /* special case, faster code */
1286                 *buffer = runtime->buffer[runtime->hw_ptr];
1287                 result++;
1288         } else {
1289                 count1 = runtime->buffer_size - runtime->hw_ptr;
1290                 if (count1 > count)
1291                         count1 = count;
1292                 if (count1 > (int)(runtime->buffer_size - runtime->avail))
1293                         count1 = runtime->buffer_size - runtime->avail;
1294                 memcpy(buffer, runtime->buffer + runtime->hw_ptr, count1);
1295                 count -= count1;
1296                 result += count1;
1297                 if (count > 0) {
1298                         if (count > (int)(runtime->buffer_size - runtime->avail - count1))
1299                                 count = runtime->buffer_size - runtime->avail - count1;
1300                         memcpy(buffer + count1, runtime->buffer, count);
1301                         result += count;
1302                 }
1303         }
1304       __skip:
1305         return result;
1306 }
1307
1308 /**
1309  * snd_rawmidi_transmit_peek - copy data from the internal buffer
1310  * @substream: the rawmidi substream
1311  * @buffer: the buffer pointer
1312  * @count: data size to transfer
1313  *
1314  * Copies data from the internal output buffer to the given buffer.
1315  *
1316  * Call this in the interrupt handler when the midi output is ready,
1317  * and call snd_rawmidi_transmit_ack() after the transmission is
1318  * finished.
1319  *
1320  * Return: The size of copied data, or a negative error code on failure.
1321  */
1322 int snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
1323                               unsigned char *buffer, int count)
1324 {
1325         struct snd_rawmidi_runtime *runtime = substream->runtime;
1326         int result;
1327         unsigned long flags;
1328
1329         spin_lock_irqsave(&runtime->lock, flags);
1330         result = __snd_rawmidi_transmit_peek(substream, buffer, count);
1331         spin_unlock_irqrestore(&runtime->lock, flags);
1332         return result;
1333 }
1334 EXPORT_SYMBOL(snd_rawmidi_transmit_peek);
1335
1336 /*
1337  * __snd_rawmidi_transmit_ack - acknowledge the transmission
1338  * @substream: the rawmidi substream
1339  * @count: the transferred count
1340  *
1341  * This is a variant of __snd_rawmidi_transmit_ack() without spinlock.
1342  */
1343 static int __snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream,
1344                                       int count)
1345 {
1346         struct snd_rawmidi_runtime *runtime = substream->runtime;
1347
1348         if (runtime->buffer == NULL) {
1349                 rmidi_dbg(substream->rmidi,
1350                           "snd_rawmidi_transmit_ack: output is not active!!!\n");
1351                 return -EINVAL;
1352         }
1353         snd_BUG_ON(runtime->avail + count > runtime->buffer_size);
1354         runtime->hw_ptr += count;
1355         runtime->hw_ptr %= runtime->buffer_size;
1356         runtime->avail += count;
1357         substream->bytes += count;
1358         if (count > 0) {
1359                 if (runtime->drain || __snd_rawmidi_ready(runtime))
1360                         wake_up(&runtime->sleep);
1361         }
1362         return count;
1363 }
1364
1365 /**
1366  * snd_rawmidi_transmit_ack - acknowledge the transmission
1367  * @substream: the rawmidi substream
1368  * @count: the transferred count
1369  *
1370  * Advances the hardware pointer for the internal output buffer with
1371  * the given size and updates the condition.
1372  * Call after the transmission is finished.
1373  *
1374  * Return: The advanced size if successful, or a negative error code on failure.
1375  */
1376 int snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count)
1377 {
1378         struct snd_rawmidi_runtime *runtime = substream->runtime;
1379         int result;
1380         unsigned long flags;
1381
1382         spin_lock_irqsave(&runtime->lock, flags);
1383         result = __snd_rawmidi_transmit_ack(substream, count);
1384         spin_unlock_irqrestore(&runtime->lock, flags);
1385         return result;
1386 }
1387 EXPORT_SYMBOL(snd_rawmidi_transmit_ack);
1388
1389 /**
1390  * snd_rawmidi_transmit - copy from the buffer to the device
1391  * @substream: the rawmidi substream
1392  * @buffer: the buffer pointer
1393  * @count: the data size to transfer
1394  *
1395  * Copies data from the buffer to the device and advances the pointer.
1396  *
1397  * Return: The copied size if successful, or a negative error code on failure.
1398  */
1399 int snd_rawmidi_transmit(struct snd_rawmidi_substream *substream,
1400                          unsigned char *buffer, int count)
1401 {
1402         struct snd_rawmidi_runtime *runtime = substream->runtime;
1403         int result;
1404         unsigned long flags;
1405
1406         spin_lock_irqsave(&runtime->lock, flags);
1407         if (!substream->opened)
1408                 result = -EBADFD;
1409         else {
1410                 count = __snd_rawmidi_transmit_peek(substream, buffer, count);
1411                 if (count <= 0)
1412                         result = count;
1413                 else
1414                         result = __snd_rawmidi_transmit_ack(substream, count);
1415         }
1416         spin_unlock_irqrestore(&runtime->lock, flags);
1417         return result;
1418 }
1419 EXPORT_SYMBOL(snd_rawmidi_transmit);
1420
1421 /**
1422  * snd_rawmidi_proceed - Discard the all pending bytes and proceed
1423  * @substream: rawmidi substream
1424  *
1425  * Return: the number of discarded bytes
1426  */
1427 int snd_rawmidi_proceed(struct snd_rawmidi_substream *substream)
1428 {
1429         struct snd_rawmidi_runtime *runtime = substream->runtime;
1430         unsigned long flags;
1431         int count = 0;
1432
1433         spin_lock_irqsave(&runtime->lock, flags);
1434         if (runtime->avail < runtime->buffer_size) {
1435                 count = runtime->buffer_size - runtime->avail;
1436                 __snd_rawmidi_transmit_ack(substream, count);
1437         }
1438         spin_unlock_irqrestore(&runtime->lock, flags);
1439         return count;
1440 }
1441 EXPORT_SYMBOL(snd_rawmidi_proceed);
1442
1443 static long snd_rawmidi_kernel_write1(struct snd_rawmidi_substream *substream,
1444                                       const unsigned char __user *userbuf,
1445                                       const unsigned char *kernelbuf,
1446                                       long count)
1447 {
1448         unsigned long flags;
1449         long count1, result;
1450         struct snd_rawmidi_runtime *runtime = substream->runtime;
1451         unsigned long appl_ptr;
1452
1453         if (!kernelbuf && !userbuf)
1454                 return -EINVAL;
1455         if (snd_BUG_ON(!runtime->buffer))
1456                 return -EINVAL;
1457
1458         result = 0;
1459         spin_lock_irqsave(&runtime->lock, flags);
1460         if (substream->append) {
1461                 if ((long)runtime->avail < count) {
1462                         spin_unlock_irqrestore(&runtime->lock, flags);
1463                         return -EAGAIN;
1464                 }
1465         }
1466         snd_rawmidi_buffer_ref(runtime);
1467         while (count > 0 && runtime->avail > 0) {
1468                 count1 = runtime->buffer_size - runtime->appl_ptr;
1469                 if (count1 > count)
1470                         count1 = count;
1471                 if (count1 > (long)runtime->avail)
1472                         count1 = runtime->avail;
1473
1474                 /* update runtime->appl_ptr before unlocking for userbuf */
1475                 appl_ptr = runtime->appl_ptr;
1476                 runtime->appl_ptr += count1;
1477                 runtime->appl_ptr %= runtime->buffer_size;
1478                 runtime->avail -= count1;
1479
1480                 if (kernelbuf)
1481                         memcpy(runtime->buffer + appl_ptr,
1482                                kernelbuf + result, count1);
1483                 else if (userbuf) {
1484                         spin_unlock_irqrestore(&runtime->lock, flags);
1485                         if (copy_from_user(runtime->buffer + appl_ptr,
1486                                            userbuf + result, count1)) {
1487                                 spin_lock_irqsave(&runtime->lock, flags);
1488                                 result = result > 0 ? result : -EFAULT;
1489                                 goto __end;
1490                         }
1491                         spin_lock_irqsave(&runtime->lock, flags);
1492                 }
1493                 result += count1;
1494                 count -= count1;
1495         }
1496       __end:
1497         count1 = runtime->avail < runtime->buffer_size;
1498         snd_rawmidi_buffer_unref(runtime);
1499         spin_unlock_irqrestore(&runtime->lock, flags);
1500         if (count1)
1501                 snd_rawmidi_output_trigger(substream, 1);
1502         return result;
1503 }
1504
1505 long snd_rawmidi_kernel_write(struct snd_rawmidi_substream *substream,
1506                               const unsigned char *buf, long count)
1507 {
1508         return snd_rawmidi_kernel_write1(substream, NULL, buf, count);
1509 }
1510 EXPORT_SYMBOL(snd_rawmidi_kernel_write);
1511
1512 static ssize_t snd_rawmidi_write(struct file *file, const char __user *buf,
1513                                  size_t count, loff_t *offset)
1514 {
1515         long result, timeout;
1516         int count1;
1517         struct snd_rawmidi_file *rfile;
1518         struct snd_rawmidi_runtime *runtime;
1519         struct snd_rawmidi_substream *substream;
1520
1521         rfile = file->private_data;
1522         substream = rfile->output;
1523         runtime = substream->runtime;
1524         /* we cannot put an atomic message to our buffer */
1525         if (substream->append && count > runtime->buffer_size)
1526                 return -EIO;
1527         result = 0;
1528         while (count > 0) {
1529                 spin_lock_irq(&runtime->lock);
1530                 while (!snd_rawmidi_ready_append(substream, count)) {
1531                         wait_queue_entry_t wait;
1532
1533                         if (file->f_flags & O_NONBLOCK) {
1534                                 spin_unlock_irq(&runtime->lock);
1535                                 return result > 0 ? result : -EAGAIN;
1536                         }
1537                         init_waitqueue_entry(&wait, current);
1538                         add_wait_queue(&runtime->sleep, &wait);
1539                         set_current_state(TASK_INTERRUPTIBLE);
1540                         spin_unlock_irq(&runtime->lock);
1541                         timeout = schedule_timeout(30 * HZ);
1542                         remove_wait_queue(&runtime->sleep, &wait);
1543                         if (rfile->rmidi->card->shutdown)
1544                                 return -ENODEV;
1545                         if (signal_pending(current))
1546                                 return result > 0 ? result : -ERESTARTSYS;
1547                         spin_lock_irq(&runtime->lock);
1548                         if (!runtime->avail && !timeout) {
1549                                 spin_unlock_irq(&runtime->lock);
1550                                 return result > 0 ? result : -EIO;
1551                         }
1552                 }
1553                 spin_unlock_irq(&runtime->lock);
1554                 count1 = snd_rawmidi_kernel_write1(substream, buf, NULL, count);
1555                 if (count1 < 0)
1556                         return result > 0 ? result : count1;
1557                 result += count1;
1558                 buf += count1;
1559                 if ((size_t)count1 < count && (file->f_flags & O_NONBLOCK))
1560                         break;
1561                 count -= count1;
1562         }
1563         if (file->f_flags & O_DSYNC) {
1564                 spin_lock_irq(&runtime->lock);
1565                 while (runtime->avail != runtime->buffer_size) {
1566                         wait_queue_entry_t wait;
1567                         unsigned int last_avail = runtime->avail;
1568
1569                         init_waitqueue_entry(&wait, current);
1570                         add_wait_queue(&runtime->sleep, &wait);
1571                         set_current_state(TASK_INTERRUPTIBLE);
1572                         spin_unlock_irq(&runtime->lock);
1573                         timeout = schedule_timeout(30 * HZ);
1574                         remove_wait_queue(&runtime->sleep, &wait);
1575                         if (signal_pending(current))
1576                                 return result > 0 ? result : -ERESTARTSYS;
1577                         if (runtime->avail == last_avail && !timeout)
1578                                 return result > 0 ? result : -EIO;
1579                         spin_lock_irq(&runtime->lock);
1580                 }
1581                 spin_unlock_irq(&runtime->lock);
1582         }
1583         return result;
1584 }
1585
1586 static __poll_t snd_rawmidi_poll(struct file *file, poll_table *wait)
1587 {
1588         struct snd_rawmidi_file *rfile;
1589         struct snd_rawmidi_runtime *runtime;
1590         __poll_t mask;
1591
1592         rfile = file->private_data;
1593         if (rfile->input != NULL) {
1594                 runtime = rfile->input->runtime;
1595                 snd_rawmidi_input_trigger(rfile->input, 1);
1596                 poll_wait(file, &runtime->sleep, wait);
1597         }
1598         if (rfile->output != NULL) {
1599                 runtime = rfile->output->runtime;
1600                 poll_wait(file, &runtime->sleep, wait);
1601         }
1602         mask = 0;
1603         if (rfile->input != NULL) {
1604                 if (snd_rawmidi_ready(rfile->input))
1605                         mask |= EPOLLIN | EPOLLRDNORM;
1606         }
1607         if (rfile->output != NULL) {
1608                 if (snd_rawmidi_ready(rfile->output))
1609                         mask |= EPOLLOUT | EPOLLWRNORM;
1610         }
1611         return mask;
1612 }
1613
1614 /*
1615  */
1616 #ifdef CONFIG_COMPAT
1617 #include "rawmidi_compat.c"
1618 #else
1619 #define snd_rawmidi_ioctl_compat        NULL
1620 #endif
1621
1622 /*
1623  */
1624
1625 static void snd_rawmidi_proc_info_read(struct snd_info_entry *entry,
1626                                        struct snd_info_buffer *buffer)
1627 {
1628         struct snd_rawmidi *rmidi;
1629         struct snd_rawmidi_substream *substream;
1630         struct snd_rawmidi_runtime *runtime;
1631         unsigned long buffer_size, avail, xruns;
1632         unsigned int clock_type;
1633         static const char *clock_names[4] = { "none", "realtime", "monotonic", "monotonic raw" };
1634
1635         rmidi = entry->private_data;
1636         snd_iprintf(buffer, "%s\n\n", rmidi->name);
1637         mutex_lock(&rmidi->open_mutex);
1638         if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_OUTPUT) {
1639                 list_for_each_entry(substream,
1640                                     &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams,
1641                                     list) {
1642                         snd_iprintf(buffer,
1643                                     "Output %d\n"
1644                                     "  Tx bytes     : %lu\n",
1645                                     substream->number,
1646                                     (unsigned long) substream->bytes);
1647                         if (substream->opened) {
1648                                 snd_iprintf(buffer,
1649                                     "  Owner PID    : %d\n",
1650                                     pid_vnr(substream->pid));
1651                                 runtime = substream->runtime;
1652                                 spin_lock_irq(&runtime->lock);
1653                                 buffer_size = runtime->buffer_size;
1654                                 avail = runtime->avail;
1655                                 spin_unlock_irq(&runtime->lock);
1656                                 snd_iprintf(buffer,
1657                                     "  Mode         : %s\n"
1658                                     "  Buffer size  : %lu\n"
1659                                     "  Avail        : %lu\n",
1660                                     runtime->oss ? "OSS compatible" : "native",
1661                                     buffer_size, avail);
1662                         }
1663                 }
1664         }
1665         if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_INPUT) {
1666                 list_for_each_entry(substream,
1667                                     &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams,
1668                                     list) {
1669                         snd_iprintf(buffer,
1670                                     "Input %d\n"
1671                                     "  Rx bytes     : %lu\n",
1672                                     substream->number,
1673                                     (unsigned long) substream->bytes);
1674                         if (substream->opened) {
1675                                 snd_iprintf(buffer,
1676                                             "  Owner PID    : %d\n",
1677                                             pid_vnr(substream->pid));
1678                                 runtime = substream->runtime;
1679                                 spin_lock_irq(&runtime->lock);
1680                                 buffer_size = runtime->buffer_size;
1681                                 avail = runtime->avail;
1682                                 xruns = runtime->xruns;
1683                                 spin_unlock_irq(&runtime->lock);
1684                                 snd_iprintf(buffer,
1685                                             "  Buffer size  : %lu\n"
1686                                             "  Avail        : %lu\n"
1687                                             "  Overruns     : %lu\n",
1688                                             buffer_size, avail, xruns);
1689                                 if (substream->framing == SNDRV_RAWMIDI_MODE_FRAMING_TSTAMP) {
1690                                         clock_type = substream->clock_type >> SNDRV_RAWMIDI_MODE_CLOCK_SHIFT;
1691                                         if (!snd_BUG_ON(clock_type >= ARRAY_SIZE(clock_names)))
1692                                                 snd_iprintf(buffer,
1693                                                             "  Framing      : tstamp\n"
1694                                                             "  Clock type   : %s\n",
1695                                                             clock_names[clock_type]);
1696                                 }
1697                         }
1698                 }
1699         }
1700         mutex_unlock(&rmidi->open_mutex);
1701 }
1702
1703 /*
1704  *  Register functions
1705  */
1706
1707 static const struct file_operations snd_rawmidi_f_ops = {
1708         .owner =        THIS_MODULE,
1709         .read =         snd_rawmidi_read,
1710         .write =        snd_rawmidi_write,
1711         .open =         snd_rawmidi_open,
1712         .release =      snd_rawmidi_release,
1713         .llseek =       no_llseek,
1714         .poll =         snd_rawmidi_poll,
1715         .unlocked_ioctl =       snd_rawmidi_ioctl,
1716         .compat_ioctl = snd_rawmidi_ioctl_compat,
1717 };
1718
1719 static int snd_rawmidi_alloc_substreams(struct snd_rawmidi *rmidi,
1720                                         struct snd_rawmidi_str *stream,
1721                                         int direction,
1722                                         int count)
1723 {
1724         struct snd_rawmidi_substream *substream;
1725         int idx;
1726
1727         for (idx = 0; idx < count; idx++) {
1728                 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
1729                 if (!substream)
1730                         return -ENOMEM;
1731                 substream->stream = direction;
1732                 substream->number = idx;
1733                 substream->rmidi = rmidi;
1734                 substream->pstr = stream;
1735                 list_add_tail(&substream->list, &stream->substreams);
1736                 stream->substream_count++;
1737         }
1738         return 0;
1739 }
1740
1741 static void release_rawmidi_device(struct device *dev)
1742 {
1743         kfree(container_of(dev, struct snd_rawmidi, dev));
1744 }
1745
1746 /**
1747  * snd_rawmidi_new - create a rawmidi instance
1748  * @card: the card instance
1749  * @id: the id string
1750  * @device: the device index
1751  * @output_count: the number of output streams
1752  * @input_count: the number of input streams
1753  * @rrawmidi: the pointer to store the new rawmidi instance
1754  *
1755  * Creates a new rawmidi instance.
1756  * Use snd_rawmidi_set_ops() to set the operators to the new instance.
1757  *
1758  * Return: Zero if successful, or a negative error code on failure.
1759  */
1760 int snd_rawmidi_new(struct snd_card *card, char *id, int device,
1761                     int output_count, int input_count,
1762                     struct snd_rawmidi **rrawmidi)
1763 {
1764         struct snd_rawmidi *rmidi;
1765         int err;
1766         static const struct snd_device_ops ops = {
1767                 .dev_free = snd_rawmidi_dev_free,
1768                 .dev_register = snd_rawmidi_dev_register,
1769                 .dev_disconnect = snd_rawmidi_dev_disconnect,
1770         };
1771
1772         if (snd_BUG_ON(!card))
1773                 return -ENXIO;
1774         if (rrawmidi)
1775                 *rrawmidi = NULL;
1776         rmidi = kzalloc(sizeof(*rmidi), GFP_KERNEL);
1777         if (!rmidi)
1778                 return -ENOMEM;
1779         rmidi->card = card;
1780         rmidi->device = device;
1781         mutex_init(&rmidi->open_mutex);
1782         init_waitqueue_head(&rmidi->open_wait);
1783         INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams);
1784         INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams);
1785
1786         if (id != NULL)
1787                 strscpy(rmidi->id, id, sizeof(rmidi->id));
1788
1789         snd_device_initialize(&rmidi->dev, card);
1790         rmidi->dev.release = release_rawmidi_device;
1791         dev_set_name(&rmidi->dev, "midiC%iD%i", card->number, device);
1792
1793         err = snd_rawmidi_alloc_substreams(rmidi,
1794                                            &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT],
1795                                            SNDRV_RAWMIDI_STREAM_INPUT,
1796                                            input_count);
1797         if (err < 0)
1798                 goto error;
1799         err = snd_rawmidi_alloc_substreams(rmidi,
1800                                            &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT],
1801                                            SNDRV_RAWMIDI_STREAM_OUTPUT,
1802                                            output_count);
1803         if (err < 0)
1804                 goto error;
1805         err = snd_device_new(card, SNDRV_DEV_RAWMIDI, rmidi, &ops);
1806         if (err < 0)
1807                 goto error;
1808
1809         if (rrawmidi)
1810                 *rrawmidi = rmidi;
1811         return 0;
1812
1813  error:
1814         snd_rawmidi_free(rmidi);
1815         return err;
1816 }
1817 EXPORT_SYMBOL(snd_rawmidi_new);
1818
1819 static void snd_rawmidi_free_substreams(struct snd_rawmidi_str *stream)
1820 {
1821         struct snd_rawmidi_substream *substream;
1822
1823         while (!list_empty(&stream->substreams)) {
1824                 substream = list_entry(stream->substreams.next, struct snd_rawmidi_substream, list);
1825                 list_del(&substream->list);
1826                 kfree(substream);
1827         }
1828 }
1829
1830 static int snd_rawmidi_free(struct snd_rawmidi *rmidi)
1831 {
1832         if (!rmidi)
1833                 return 0;
1834
1835         snd_info_free_entry(rmidi->proc_entry);
1836         rmidi->proc_entry = NULL;
1837         mutex_lock(&register_mutex);
1838         if (rmidi->ops && rmidi->ops->dev_unregister)
1839                 rmidi->ops->dev_unregister(rmidi);
1840         mutex_unlock(&register_mutex);
1841
1842         snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT]);
1843         snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT]);
1844         if (rmidi->private_free)
1845                 rmidi->private_free(rmidi);
1846         put_device(&rmidi->dev);
1847         return 0;
1848 }
1849
1850 static int snd_rawmidi_dev_free(struct snd_device *device)
1851 {
1852         struct snd_rawmidi *rmidi = device->device_data;
1853
1854         return snd_rawmidi_free(rmidi);
1855 }
1856
1857 #if IS_ENABLED(CONFIG_SND_SEQUENCER)
1858 static void snd_rawmidi_dev_seq_free(struct snd_seq_device *device)
1859 {
1860         struct snd_rawmidi *rmidi = device->private_data;
1861
1862         rmidi->seq_dev = NULL;
1863 }
1864 #endif
1865
1866 static int snd_rawmidi_dev_register(struct snd_device *device)
1867 {
1868         int err;
1869         struct snd_info_entry *entry;
1870         char name[16];
1871         struct snd_rawmidi *rmidi = device->device_data;
1872
1873         if (rmidi->device >= SNDRV_RAWMIDI_DEVICES)
1874                 return -ENOMEM;
1875         err = 0;
1876         mutex_lock(&register_mutex);
1877         if (snd_rawmidi_search(rmidi->card, rmidi->device))
1878                 err = -EBUSY;
1879         else
1880                 list_add_tail(&rmidi->list, &snd_rawmidi_devices);
1881         mutex_unlock(&register_mutex);
1882         if (err < 0)
1883                 return err;
1884
1885         err = snd_register_device(SNDRV_DEVICE_TYPE_RAWMIDI,
1886                                   rmidi->card, rmidi->device,
1887                                   &snd_rawmidi_f_ops, rmidi, &rmidi->dev);
1888         if (err < 0) {
1889                 rmidi_err(rmidi, "unable to register\n");
1890                 goto error;
1891         }
1892         if (rmidi->ops && rmidi->ops->dev_register) {
1893                 err = rmidi->ops->dev_register(rmidi);
1894                 if (err < 0)
1895                         goto error_unregister;
1896         }
1897 #ifdef CONFIG_SND_OSSEMUL
1898         rmidi->ossreg = 0;
1899         if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1900                 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1901                                             rmidi->card, 0, &snd_rawmidi_f_ops,
1902                                             rmidi) < 0) {
1903                         rmidi_err(rmidi,
1904                                   "unable to register OSS rawmidi device %i:%i\n",
1905                                   rmidi->card->number, 0);
1906                 } else {
1907                         rmidi->ossreg++;
1908 #ifdef SNDRV_OSS_INFO_DEV_MIDI
1909                         snd_oss_info_register(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number, rmidi->name);
1910 #endif
1911                 }
1912         }
1913         if ((int)rmidi->device == amidi_map[rmidi->card->number]) {
1914                 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1915                                             rmidi->card, 1, &snd_rawmidi_f_ops,
1916                                             rmidi) < 0) {
1917                         rmidi_err(rmidi,
1918                                   "unable to register OSS rawmidi device %i:%i\n",
1919                                   rmidi->card->number, 1);
1920                 } else {
1921                         rmidi->ossreg++;
1922                 }
1923         }
1924 #endif /* CONFIG_SND_OSSEMUL */
1925         sprintf(name, "midi%d", rmidi->device);
1926         entry = snd_info_create_card_entry(rmidi->card, name, rmidi->card->proc_root);
1927         if (entry) {
1928                 entry->private_data = rmidi;
1929                 entry->c.text.read = snd_rawmidi_proc_info_read;
1930                 if (snd_info_register(entry) < 0) {
1931                         snd_info_free_entry(entry);
1932                         entry = NULL;
1933                 }
1934         }
1935         rmidi->proc_entry = entry;
1936 #if IS_ENABLED(CONFIG_SND_SEQUENCER)
1937         if (!rmidi->ops || !rmidi->ops->dev_register) { /* own registration mechanism */
1938                 if (snd_seq_device_new(rmidi->card, rmidi->device, SNDRV_SEQ_DEV_ID_MIDISYNTH, 0, &rmidi->seq_dev) >= 0) {
1939                         rmidi->seq_dev->private_data = rmidi;
1940                         rmidi->seq_dev->private_free = snd_rawmidi_dev_seq_free;
1941                         sprintf(rmidi->seq_dev->name, "MIDI %d-%d", rmidi->card->number, rmidi->device);
1942                         snd_device_register(rmidi->card, rmidi->seq_dev);
1943                 }
1944         }
1945 #endif
1946         return 0;
1947
1948  error_unregister:
1949         snd_unregister_device(&rmidi->dev);
1950  error:
1951         mutex_lock(&register_mutex);
1952         list_del(&rmidi->list);
1953         mutex_unlock(&register_mutex);
1954         return err;
1955 }
1956
1957 static int snd_rawmidi_dev_disconnect(struct snd_device *device)
1958 {
1959         struct snd_rawmidi *rmidi = device->device_data;
1960         int dir;
1961
1962         mutex_lock(&register_mutex);
1963         mutex_lock(&rmidi->open_mutex);
1964         wake_up(&rmidi->open_wait);
1965         list_del_init(&rmidi->list);
1966         for (dir = 0; dir < 2; dir++) {
1967                 struct snd_rawmidi_substream *s;
1968
1969                 list_for_each_entry(s, &rmidi->streams[dir].substreams, list) {
1970                         if (s->runtime)
1971                                 wake_up(&s->runtime->sleep);
1972                 }
1973         }
1974
1975 #ifdef CONFIG_SND_OSSEMUL
1976         if (rmidi->ossreg) {
1977                 if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1978                         snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 0);
1979 #ifdef SNDRV_OSS_INFO_DEV_MIDI
1980                         snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number);
1981 #endif
1982                 }
1983                 if ((int)rmidi->device == amidi_map[rmidi->card->number])
1984                         snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 1);
1985                 rmidi->ossreg = 0;
1986         }
1987 #endif /* CONFIG_SND_OSSEMUL */
1988         snd_unregister_device(&rmidi->dev);
1989         mutex_unlock(&rmidi->open_mutex);
1990         mutex_unlock(&register_mutex);
1991         return 0;
1992 }
1993
1994 /**
1995  * snd_rawmidi_set_ops - set the rawmidi operators
1996  * @rmidi: the rawmidi instance
1997  * @stream: the stream direction, SNDRV_RAWMIDI_STREAM_XXX
1998  * @ops: the operator table
1999  *
2000  * Sets the rawmidi operators for the given stream direction.
2001  */
2002 void snd_rawmidi_set_ops(struct snd_rawmidi *rmidi, int stream,
2003                          const struct snd_rawmidi_ops *ops)
2004 {
2005         struct snd_rawmidi_substream *substream;
2006
2007         list_for_each_entry(substream, &rmidi->streams[stream].substreams, list)
2008                 substream->ops = ops;
2009 }
2010 EXPORT_SYMBOL(snd_rawmidi_set_ops);
2011
2012 /*
2013  *  ENTRY functions
2014  */
2015
2016 static int __init alsa_rawmidi_init(void)
2017 {
2018
2019         snd_ctl_register_ioctl(snd_rawmidi_control_ioctl);
2020         snd_ctl_register_ioctl_compat(snd_rawmidi_control_ioctl);
2021 #ifdef CONFIG_SND_OSSEMUL
2022         { int i;
2023         /* check device map table */
2024         for (i = 0; i < SNDRV_CARDS; i++) {
2025                 if (midi_map[i] < 0 || midi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
2026                         pr_err("ALSA: rawmidi: invalid midi_map[%d] = %d\n",
2027                                i, midi_map[i]);
2028                         midi_map[i] = 0;
2029                 }
2030                 if (amidi_map[i] < 0 || amidi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
2031                         pr_err("ALSA: rawmidi: invalid amidi_map[%d] = %d\n",
2032                                i, amidi_map[i]);
2033                         amidi_map[i] = 1;
2034                 }
2035         }
2036         }
2037 #endif /* CONFIG_SND_OSSEMUL */
2038         return 0;
2039 }
2040
2041 static void __exit alsa_rawmidi_exit(void)
2042 {
2043         snd_ctl_unregister_ioctl(snd_rawmidi_control_ioctl);
2044         snd_ctl_unregister_ioctl_compat(snd_rawmidi_control_ioctl);
2045 }
2046
2047 module_init(alsa_rawmidi_init)
2048 module_exit(alsa_rawmidi_exit)