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