sound/core/rawmidi.c

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