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