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                 snd_card_unref(rmidi->card);
 384                 return -ENXIO;
 385         }
 386
 387         mutex_lock(&rmidi->open_mutex);
 388         card = rmidi->card;
 389         err = snd_card_file_add(card, file);
 390         if (err < 0)
 391                 goto __error_card;
 392         fflags = snd_rawmidi_file_flags(file);
 393         if ((file->f_flags & O_APPEND) || maj == SOUND_MAJOR) /* OSS emul? */
 394                 fflags |= SNDRV_RAWMIDI_LFLG_APPEND;
 395         rawmidi_file = kmalloc(sizeof(*rawmidi_file), GFP_KERNEL);
 396         if (rawmidi_file == NULL) {
 397                 err = -ENOMEM;
 398                 goto __error;
 399         }
 400         init_waitqueue_entry(&wait, current);
 401         add_wait_queue(&rmidi->open_wait, &wait);
 402         while (1) {
 403                 subdevice = -1;
 404                 read_lock(&card->ctl_files_rwlock);
 405                 list_for_each_entry(kctl, &card->ctl_files, list) {
 406                         if (kctl->pid == task_pid(current)) {
 407                                 subdevice = kctl->prefer_rawmidi_subdevice;
 408                                 if (subdevice != -1)
 409                                         break;
 410                         }
 411                 }
 412                 read_unlock(&card->ctl_files_rwlock);
 413                 err = rawmidi_open_priv(rmidi, subdevice, fflags, rawmidi_file);
 414                 if (err >= 0)
 415                         break;
 416                 if (err == -EAGAIN) {
 417                         if (file->f_flags & O_NONBLOCK) {
 418                                 err = -EBUSY;
 419                                 break;
 420                         }
 421                 } else
 422                         break;
 423                 set_current_state(TASK_INTERRUPTIBLE);
 424                 mutex_unlock(&rmidi->open_mutex);
 425                 schedule();
 426                 mutex_lock(&rmidi->open_mutex);
 427                 if (rmidi->card->shutdown) {
 428                         err = -ENODEV;
 429                         break;
 430                 }
 431                 if (signal_pending(current)) {
 432                         err = -ERESTARTSYS;
 433                         break;
 434                 }
 435         }
 436         remove_wait_queue(&rmidi->open_wait, &wait);
 437         if (err < 0) {
 438                 kfree(rawmidi_file);
 439                 goto __error;
 440         }
 441 #ifdef CONFIG_SND_OSSEMUL
 442         if (rawmidi_file->input && rawmidi_file->input->runtime)
 443                 rawmidi_file->input->runtime->oss = (maj == SOUND_MAJOR);
 444         if (rawmidi_file->output && rawmidi_file->output->runtime)
 445                 rawmidi_file->output->runtime->oss = (maj == SOUND_MAJOR);
 446 #endif
 447         file->private_data = rawmidi_file;
 448         mutex_unlock(&rmidi->open_mutex);
 449         snd_card_unref(rmidi->card);
 450         return 0;
 451
 452  __error:
 453         snd_card_file_remove(card, file);
 454  __error_card:
 455         mutex_unlock(&rmidi->open_mutex);
 456         module_put(rmidi->card->module);
 457         snd_card_unref(rmidi->card);
 458         return err;
 459 }
 460
 461 static void close_substream(struct snd_rawmidi *rmidi,
 462                             struct snd_rawmidi_substream *substream,
 463                             int cleanup)
 464 {
 465         if (--substream->use_count)
 466                 return;
 467
 468         if (cleanup) {
 469                 if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
 470                         snd_rawmidi_input_trigger(substream, 0);
 471                 else {
 472                         if (substream->active_sensing) {
 473                                 unsigned char buf = 0xfe;
 474                                 /* sending single active sensing message
 475                                  * to shut the device up
 476                                  */
 477                                 snd_rawmidi_kernel_write(substream, &buf, 1);
 478                         }
 479                         if (snd_rawmidi_drain_output(substream) == -ERESTARTSYS)
 480                                 snd_rawmidi_output_trigger(substream, 0);
 481                 }
 482         }
 483         substream->ops->close(substream);
 484         if (substream->runtime->private_free)
 485                 substream->runtime->private_free(substream);
 486         snd_rawmidi_runtime_free(substream);
 487         substream->opened = 0;
 488         substream->append = 0;
 489         put_pid(substream->pid);
 490         substream->pid = NULL;
 491         rmidi->streams[substream->stream].substream_opened--;
 492 }
 493
 494 static void rawmidi_release_priv(struct snd_rawmidi_file *rfile)
 495 {
 496         struct snd_rawmidi *rmidi;
 497
 498         rmidi = rfile->rmidi;
 499         mutex_lock(&rmidi->open_mutex);
 500         if (rfile->input) {
 501                 close_substream(rmidi, rfile->input, 1);
 502                 rfile->input = NULL;
 503         }
 504         if (rfile->output) {
 505                 close_substream(rmidi, rfile->output, 1);
 506                 rfile->output = NULL;
 507         }
 508         rfile->rmidi = NULL;
 509         mutex_unlock(&rmidi->open_mutex);
 510         wake_up(&rmidi->open_wait);
 511 }
 512
 513 /* called from sound/core/seq/seq_midi.c */
 514 int snd_rawmidi_kernel_release(struct snd_rawmidi_file *rfile)
 515 {
 516         struct snd_rawmidi *rmidi;
 517
 518         if (snd_BUG_ON(!rfile))
 519                 return -ENXIO;
 520
 521         rmidi = rfile->rmidi;
 522         rawmidi_release_priv(rfile);
 523         module_put(rmidi->card->module);
 524         return 0;
 525 }
 526
 527 static int snd_rawmidi_release(struct inode *inode, struct file *file)
 528 {
 529         struct snd_rawmidi_file *rfile;
 530         struct snd_rawmidi *rmidi;
 531         struct module *module;
 532
 533         rfile = file->private_data;
 534         rmidi = rfile->rmidi;
 535         rawmidi_release_priv(rfile);
 536         kfree(rfile);
 537         module = rmidi->card->module;
 538         snd_card_file_remove(rmidi->card, file);
 539         module_put(module);
 540         return 0;
 541 }
 542
 543 static int snd_rawmidi_info(struct snd_rawmidi_substream *substream,
 544                             struct snd_rawmidi_info *info)
 545 {
 546         struct snd_rawmidi *rmidi;
 547
 548         if (substream == NULL)
 549                 return -ENODEV;
 550         rmidi = substream->rmidi;
 551         memset(info, 0, sizeof(*info));
 552         info->card = rmidi->card->number;
 553         info->device = rmidi->device;
 554         info->subdevice = substream->number;
 555         info->stream = substream->stream;
 556         info->flags = rmidi->info_flags;
 557         strcpy(info->id, rmidi->id);
 558         strcpy(info->name, rmidi->name);
 559         strcpy(info->subname, substream->name);
 560         info->subdevices_count = substream->pstr->substream_count;
 561         info->subdevices_avail = (substream->pstr->substream_count -
 562                                   substream->pstr->substream_opened);
 563         return 0;
 564 }
 565
 566 static int snd_rawmidi_info_user(struct snd_rawmidi_substream *substream,
 567                                  struct snd_rawmidi_info __user * _info)
 568 {
 569         struct snd_rawmidi_info info;
 570         int err;
 571         if ((err = snd_rawmidi_info(substream, &info)) < 0)
 572                 return err;
 573         if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
 574                 return -EFAULT;
 575         return 0;
 576 }
 577
 578 int snd_rawmidi_info_select(struct snd_card *card, struct snd_rawmidi_info *info)
 579 {
 580         struct snd_rawmidi *rmidi;
 581         struct snd_rawmidi_str *pstr;
 582         struct snd_rawmidi_substream *substream;
 583
 584         mutex_lock(&register_mutex);
 585         rmidi = snd_rawmidi_search(card, info->device);
 586         mutex_unlock(&register_mutex);
 587         if (!rmidi)
 588                 return -ENXIO;
 589         if (info->stream < 0 || info->stream > 1)
 590                 return -EINVAL;
 591         pstr = &rmidi->streams[info->stream];
 592         if (pstr->substream_count == 0)
 593                 return -ENOENT;
 594         if (info->subdevice >= pstr->substream_count)
 595                 return -ENXIO;
 596         list_for_each_entry(substream, &pstr->substreams, list) {
 597                 if ((unsigned int)substream->number == info->subdevice)
 598                         return snd_rawmidi_info(substream, info);
 599         }
 600         return -ENXIO;
 601 }
 602
 603 static int snd_rawmidi_info_select_user(struct snd_card *card,
 604                                         struct snd_rawmidi_info __user *_info)
 605 {
 606         int err;
 607         struct snd_rawmidi_info info;
 608         if (get_user(info.device, &_info->device))
 609                 return -EFAULT;
 610         if (get_user(info.stream, &_info->stream))
 611                 return -EFAULT;
 612         if (get_user(info.subdevice, &_info->subdevice))
 613                 return -EFAULT;
 614         if ((err = snd_rawmidi_info_select(card, &info)) < 0)
 615                 return err;
 616         if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
 617                 return -EFAULT;
 618         return 0;
 619 }
 620
 621 int snd_rawmidi_output_params(struct snd_rawmidi_substream *substream,
 622                               struct snd_rawmidi_params * params)
 623 {
 624         char *newbuf;
 625         struct snd_rawmidi_runtime *runtime = substream->runtime;
 626
 627         if (substream->append && substream->use_count > 1)
 628                 return -EBUSY;
 629         snd_rawmidi_drain_output(substream);
 630         if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L) {
 631                 return -EINVAL;
 632         }
 633         if (params->avail_min < 1 || params->avail_min > params->buffer_size) {
 634                 return -EINVAL;
 635         }
 636         if (params->buffer_size != runtime->buffer_size) {
 637                 newbuf = krealloc(runtime->buffer, params->buffer_size,
 638                                   GFP_KERNEL);
 639                 if (!newbuf)
 640                         return -ENOMEM;
 641                 runtime->buffer = newbuf;
 642                 runtime->buffer_size = params->buffer_size;
 643                 runtime->avail = runtime->buffer_size;
 644         }
 645         runtime->avail_min = params->avail_min;
 646         substream->active_sensing = !params->no_active_sensing;
 647         return 0;
 648 }
 649
 650 int snd_rawmidi_input_params(struct snd_rawmidi_substream *substream,
 651                              struct snd_rawmidi_params * params)
 652 {
 653         char *newbuf;
 654         struct snd_rawmidi_runtime *runtime = substream->runtime;
 655
 656         snd_rawmidi_drain_input(substream);
 657         if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L) {
 658                 return -EINVAL;
 659         }
 660         if (params->avail_min < 1 || params->avail_min > params->buffer_size) {
 661                 return -EINVAL;
 662         }
 663         if (params->buffer_size != runtime->buffer_size) {
 664                 newbuf = krealloc(runtime->buffer, params->buffer_size,
 665                                   GFP_KERNEL);
 666                 if (!newbuf)
 667                         return -ENOMEM;
 668                 runtime->buffer = newbuf;
 669                 runtime->buffer_size = params->buffer_size;
 670         }
 671         runtime->avail_min = params->avail_min;
 672         return 0;
 673 }
 674
 675 static int snd_rawmidi_output_status(struct snd_rawmidi_substream *substream,
 676                                      struct snd_rawmidi_status * status)
 677 {
 678         struct snd_rawmidi_runtime *runtime = substream->runtime;
 679
 680         memset(status, 0, sizeof(*status));
 681         status->stream = SNDRV_RAWMIDI_STREAM_OUTPUT;
 682         spin_lock_irq(&runtime->lock);
 683         status->avail = runtime->avail;
 684         spin_unlock_irq(&runtime->lock);
 685         return 0;
 686 }
 687
 688 static int snd_rawmidi_input_status(struct snd_rawmidi_substream *substream,
 689                                     struct snd_rawmidi_status * status)
 690 {
 691         struct snd_rawmidi_runtime *runtime = substream->runtime;
 692
 693         memset(status, 0, sizeof(*status));
 694         status->stream = SNDRV_RAWMIDI_STREAM_INPUT;
 695         spin_lock_irq(&runtime->lock);
 696         status->avail = runtime->avail;
 697         status->xruns = runtime->xruns;
 698         runtime->xruns = 0;
 699         spin_unlock_irq(&runtime->lock);
 700         return 0;
 701 }
 702
 703 static long snd_rawmidi_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 704 {
 705         struct snd_rawmidi_file *rfile;
 706         void __user *argp = (void __user *)arg;
 707
 708         rfile = file->private_data;
 709         if (((cmd >> 8) & 0xff) != 'W')
 710                 return -ENOTTY;
 711         switch (cmd) {
 712         case SNDRV_RAWMIDI_IOCTL_PVERSION:
 713                 return put_user(SNDRV_RAWMIDI_VERSION, (int __user *)argp) ? -EFAULT : 0;
 714         case SNDRV_RAWMIDI_IOCTL_INFO:
 715         {
 716                 int stream;
 717                 struct snd_rawmidi_info __user *info = argp;
 718                 if (get_user(stream, &info->stream))
 719                         return -EFAULT;
 720                 switch (stream) {
 721                 case SNDRV_RAWMIDI_STREAM_INPUT:
 722                         return snd_rawmidi_info_user(rfile->input, info);
 723                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
 724                         return snd_rawmidi_info_user(rfile->output, info);
 725                 default:
 726                         return -EINVAL;
 727                 }
 728         }
 729         case SNDRV_RAWMIDI_IOCTL_PARAMS:
 730         {
 731                 struct snd_rawmidi_params params;
 732                 if (copy_from_user(&params, argp, sizeof(struct snd_rawmidi_params)))
 733                         return -EFAULT;
 734                 switch (params.stream) {
 735                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
 736                         if (rfile->output == NULL)
 737                                 return -EINVAL;
 738                         return snd_rawmidi_output_params(rfile->output, &params);
 739                 case SNDRV_RAWMIDI_STREAM_INPUT:
 740                         if (rfile->input == NULL)
 741                                 return -EINVAL;
 742                         return snd_rawmidi_input_params(rfile->input, &params);
 743                 default:
 744                         return -EINVAL;
 745                 }
 746         }
 747         case SNDRV_RAWMIDI_IOCTL_STATUS:
 748         {
 749                 int err = 0;
 750                 struct snd_rawmidi_status status;
 751                 if (copy_from_user(&status, argp, sizeof(struct snd_rawmidi_status)))
 752                         return -EFAULT;
 753                 switch (status.stream) {
 754                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
 755                         if (rfile->output == NULL)
 756                                 return -EINVAL;
 757                         err = snd_rawmidi_output_status(rfile->output, &status);
 758                         break;
 759                 case SNDRV_RAWMIDI_STREAM_INPUT:
 760                         if (rfile->input == NULL)
 761                                 return -EINVAL;
 762                         err = snd_rawmidi_input_status(rfile->input, &status);
 763                         break;
 764                 default:
 765                         return -EINVAL;
 766                 }
 767                 if (err < 0)
 768                         return err;
 769                 if (copy_to_user(argp, &status, sizeof(struct snd_rawmidi_status)))
 770                         return -EFAULT;
 771                 return 0;
 772         }
 773         case SNDRV_RAWMIDI_IOCTL_DROP:
 774         {
 775                 int val;
 776                 if (get_user(val, (int __user *) argp))
 777                         return -EFAULT;
 778                 switch (val) {
 779                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
 780                         if (rfile->output == NULL)
 781                                 return -EINVAL;
 782                         return snd_rawmidi_drop_output(rfile->output);
 783                 default:
 784                         return -EINVAL;
 785                 }
 786         }
 787         case SNDRV_RAWMIDI_IOCTL_DRAIN:
 788         {
 789                 int val;
 790                 if (get_user(val, (int __user *) argp))
 791                         return -EFAULT;
 792                 switch (val) {
 793                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
 794                         if (rfile->output == NULL)
 795                                 return -EINVAL;
 796                         return snd_rawmidi_drain_output(rfile->output);
 797                 case SNDRV_RAWMIDI_STREAM_INPUT:
 798                         if (rfile->input == NULL)
 799                                 return -EINVAL;
 800                         return snd_rawmidi_drain_input(rfile->input);
 801                 default:
 802                         return -EINVAL;
 803                 }
 804         }
 805 #ifdef CONFIG_SND_DEBUG
 806         default:
 807                 snd_printk(KERN_WARNING "rawmidi: unknown command = 0x%x\n", cmd);
 808 #endif
 809         }
 810         return -ENOTTY;
 811 }
 812
 813 static int snd_rawmidi_control_ioctl(struct snd_card *card,
 814                                      struct snd_ctl_file *control,
 815                                      unsigned int cmd,
 816                                      unsigned long arg)
 817 {
 818         void __user *argp = (void __user *)arg;
 819
 820         switch (cmd) {
 821         case SNDRV_CTL_IOCTL_RAWMIDI_NEXT_DEVICE:
 822         {
 823                 int device;
 824
 825                 if (get_user(device, (int __user *)argp))
 826                         return -EFAULT;
 827                 if (device >= SNDRV_RAWMIDI_DEVICES) /* next device is -1 */
 828                         device = SNDRV_RAWMIDI_DEVICES - 1;
 829                 mutex_lock(&register_mutex);
 830                 device = device < 0 ? 0 : device + 1;
 831                 while (device < SNDRV_RAWMIDI_DEVICES) {
 832                         if (snd_rawmidi_search(card, device))
 833                                 break;
 834                         device++;
 835                 }
 836                 if (device == SNDRV_RAWMIDI_DEVICES)
 837                         device = -1;
 838                 mutex_unlock(&register_mutex);
 839                 if (put_user(device, (int __user *)argp))
 840                         return -EFAULT;
 841                 return 0;
 842         }
 843         case SNDRV_CTL_IOCTL_RAWMIDI_PREFER_SUBDEVICE:
 844         {
 845                 int val;
 846
 847                 if (get_user(val, (int __user *)argp))
 848                         return -EFAULT;
 849                 control->prefer_rawmidi_subdevice = val;
 850                 return 0;
 851         }
 852         case SNDRV_CTL_IOCTL_RAWMIDI_INFO:
 853                 return snd_rawmidi_info_select_user(card, argp);
 854         }
 855         return -ENOIOCTLCMD;
 856 }
 857
 858 /**
 859  * snd_rawmidi_receive - receive the input data from the device
 860  * @substream: the rawmidi substream
 861  * @buffer: the buffer pointer
 862  * @count: the data size to read
 863  *
 864  * Reads the data from the internal buffer.
 865  *
 866  * Returns the size of read data, or a negative error code on failure.
 867  */
 868 int snd_rawmidi_receive(struct snd_rawmidi_substream *substream,
 869                         const unsigned char *buffer, int count)
 870 {
 871         unsigned long flags;
 872         int result = 0, count1;
 873         struct snd_rawmidi_runtime *runtime = substream->runtime;
 874
 875         if (!substream->opened)
 876                 return -EBADFD;
 877         if (runtime->buffer == NULL) {
 878                 snd_printd("snd_rawmidi_receive: input is not active!!!\n");
 879                 return -EINVAL;
 880         }
 881         spin_lock_irqsave(&runtime->lock, flags);
 882         if (count == 1) {       /* special case, faster code */
 883                 substream->bytes++;
 884                 if (runtime->avail < runtime->buffer_size) {
 885                         runtime->buffer[runtime->hw_ptr++] = buffer[0];
 886                         runtime->hw_ptr %= runtime->buffer_size;
 887                         runtime->avail++;
 888                         result++;
 889                 } else {
 890                         runtime->xruns++;
 891                 }
 892         } else {
 893                 substream->bytes += count;
 894                 count1 = runtime->buffer_size - runtime->hw_ptr;
 895                 if (count1 > count)
 896                         count1 = count;
 897                 if (count1 > (int)(runtime->buffer_size - runtime->avail))
 898                         count1 = runtime->buffer_size - runtime->avail;
 899                 memcpy(runtime->buffer + runtime->hw_ptr, buffer, count1);
 900                 runtime->hw_ptr += count1;
 901                 runtime->hw_ptr %= runtime->buffer_size;
 902                 runtime->avail += count1;
 903                 count -= count1;
 904                 result += count1;
 905                 if (count > 0) {
 906                         buffer += count1;
 907                         count1 = count;
 908                         if (count1 > (int)(runtime->buffer_size - runtime->avail)) {
 909                                 count1 = runtime->buffer_size - runtime->avail;
 910                                 runtime->xruns += count - count1;
 911                         }
 912                         if (count1 > 0) {
 913                                 memcpy(runtime->buffer, buffer, count1);
 914                                 runtime->hw_ptr = count1;
 915                                 runtime->avail += count1;
 916                                 result += count1;
 917                         }
 918                 }
 919         }
 920         if (result > 0) {
 921                 if (runtime->event)
 922                         schedule_work(&runtime->event_work);
 923                 else if (snd_rawmidi_ready(substream))
 924                         wake_up(&runtime->sleep);
 925         }
 926         spin_unlock_irqrestore(&runtime->lock, flags);
 927         return result;
 928 }
 929
 930 static long snd_rawmidi_kernel_read1(struct snd_rawmidi_substream *substream,
 931                                      unsigned char __user *userbuf,
 932                                      unsigned char *kernelbuf, long count)
 933 {
 934         unsigned long flags;
 935         long result = 0, count1;
 936         struct snd_rawmidi_runtime *runtime = substream->runtime;
 937
 938         while (count > 0 && runtime->avail) {
 939                 count1 = runtime->buffer_size - runtime->appl_ptr;
 940                 if (count1 > count)
 941                         count1 = count;
 942                 spin_lock_irqsave(&runtime->lock, flags);
 943                 if (count1 > (int)runtime->avail)
 944                         count1 = runtime->avail;
 945                 if (kernelbuf)
 946                         memcpy(kernelbuf + result, runtime->buffer + runtime->appl_ptr, count1);
 947                 if (userbuf) {
 948                         spin_unlock_irqrestore(&runtime->lock, flags);
 949                         if (copy_to_user(userbuf + result,
 950                                          runtime->buffer + runtime->appl_ptr, count1)) {
 951                                 return result > 0 ? result : -EFAULT;
 952                         }
 953                         spin_lock_irqsave(&runtime->lock, flags);
 954                 }
 955                 runtime->appl_ptr += count1;
 956                 runtime->appl_ptr %= runtime->buffer_size;
 957                 runtime->avail -= count1;
 958                 spin_unlock_irqrestore(&runtime->lock, flags);
 959                 result += count1;
 960                 count -= count1;
 961         }
 962         return result;
 963 }
 964
 965 long snd_rawmidi_kernel_read(struct snd_rawmidi_substream *substream,
 966                              unsigned char *buf, long count)
 967 {
 968         snd_rawmidi_input_trigger(substream, 1);
 969         return snd_rawmidi_kernel_read1(substream, NULL/*userbuf*/, buf, count);
 970 }
 971
 972 static ssize_t snd_rawmidi_read(struct file *file, char __user *buf, size_t count,
 973                                 loff_t *offset)
 974 {
 975         long result;
 976         int count1;
 977         struct snd_rawmidi_file *rfile;
 978         struct snd_rawmidi_substream *substream;
 979         struct snd_rawmidi_runtime *runtime;
 980
 981         rfile = file->private_data;
 982         substream = rfile->input;
 983         if (substream == NULL)
 984                 return -EIO;
 985         runtime = substream->runtime;
 986         snd_rawmidi_input_trigger(substream, 1);
 987         result = 0;
 988         while (count > 0) {
 989                 spin_lock_irq(&runtime->lock);
 990                 while (!snd_rawmidi_ready(substream)) {
 991                         wait_queue_t wait;
 992                         if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
 993                                 spin_unlock_irq(&runtime->lock);
 994                                 return result > 0 ? result : -EAGAIN;
 995                         }
 996                         init_waitqueue_entry(&wait, current);
 997                         add_wait_queue(&runtime->sleep, &wait);
 998                         set_current_state(TASK_INTERRUPTIBLE);
 999                         spin_unlock_irq(&runtime->lock);
1000                         schedule();
1001                         remove_wait_queue(&runtime->sleep, &wait);
1002                         if (rfile->rmidi->card->shutdown)
1003                                 return -ENODEV;
1004                         if (signal_pending(current))
1005                                 return result > 0 ? result : -ERESTARTSYS;
1006                         if (!runtime->avail)
1007                                 return result > 0 ? result : -EIO;
1008                         spin_lock_irq(&runtime->lock);
1009                 }
1010                 spin_unlock_irq(&runtime->lock);
1011                 count1 = snd_rawmidi_kernel_read1(substream,
1012                                                   (unsigned char __user *)buf,
1013                                                   NULL/*kernelbuf*/,
1014                                                   count);
1015                 if (count1 < 0)
1016                         return result > 0 ? result : count1;
1017                 result += count1;
1018                 buf += count1;
1019                 count -= count1;
1020         }
1021         return result;
1022 }
1023
1024 /**
1025  * snd_rawmidi_transmit_empty - check whether the output buffer is empty
1026  * @substream: the rawmidi substream
1027  *
1028  * Returns 1 if the internal output buffer is empty, 0 if not.
1029  */
1030 int snd_rawmidi_transmit_empty(struct snd_rawmidi_substream *substream)
1031 {
1032         struct snd_rawmidi_runtime *runtime = substream->runtime;
1033         int result;
1034         unsigned long flags;
1035
1036         if (runtime->buffer == NULL) {
1037                 snd_printd("snd_rawmidi_transmit_empty: output is not active!!!\n");
1038                 return 1;
1039         }
1040         spin_lock_irqsave(&runtime->lock, flags);
1041         result = runtime->avail >= runtime->buffer_size;
1042         spin_unlock_irqrestore(&runtime->lock, flags);
1043         return result;
1044 }
1045
1046 /**
1047  * snd_rawmidi_transmit_peek - copy data from the internal buffer
1048  * @substream: the rawmidi substream
1049  * @buffer: the buffer pointer
1050  * @count: data size to transfer
1051  *
1052  * Copies data from the internal output buffer to the given buffer.
1053  *
1054  * Call this in the interrupt handler when the midi output is ready,
1055  * and call snd_rawmidi_transmit_ack() after the transmission is
1056  * finished.
1057  *
1058  * Returns the size of copied data, or a negative error code on failure.
1059  */
1060 int snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
1061                               unsigned char *buffer, int count)
1062 {
1063         unsigned long flags;
1064         int result, count1;
1065         struct snd_rawmidi_runtime *runtime = substream->runtime;
1066
1067         if (runtime->buffer == NULL) {
1068                 snd_printd("snd_rawmidi_transmit_peek: output is not active!!!\n");
1069                 return -EINVAL;
1070         }
1071         result = 0;
1072         spin_lock_irqsave(&runtime->lock, flags);
1073         if (runtime->avail >= runtime->buffer_size) {
1074                 /* warning: lowlevel layer MUST trigger down the hardware */
1075                 goto __skip;
1076         }
1077         if (count == 1) {       /* special case, faster code */
1078                 *buffer = runtime->buffer[runtime->hw_ptr];
1079                 result++;
1080         } else {
1081                 count1 = runtime->buffer_size - runtime->hw_ptr;
1082                 if (count1 > count)
1083                         count1 = count;
1084                 if (count1 > (int)(runtime->buffer_size - runtime->avail))
1085                         count1 = runtime->buffer_size - runtime->avail;
1086                 memcpy(buffer, runtime->buffer + runtime->hw_ptr, count1);
1087                 count -= count1;
1088                 result += count1;
1089                 if (count > 0) {
1090                         if (count > (int)(runtime->buffer_size - runtime->avail - count1))
1091                                 count = runtime->buffer_size - runtime->avail - count1;
1092                         memcpy(buffer + count1, runtime->buffer, count);
1093                         result += count;
1094                 }
1095         }
1096       __skip:
1097         spin_unlock_irqrestore(&runtime->lock, flags);
1098         return result;
1099 }
1100
1101 /**
1102  * snd_rawmidi_transmit_ack - acknowledge the transmission
1103  * @substream: the rawmidi substream
1104  * @count: the tranferred count
1105  *
1106  * Advances the hardware pointer for the internal output buffer with
1107  * the given size and updates the condition.
1108  * Call after the transmission is finished.
1109  *
1110  * Returns the advanced size if successful, or a negative error code on failure.
1111  */
1112 int snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count)
1113 {
1114         unsigned long flags;
1115         struct snd_rawmidi_runtime *runtime = substream->runtime;
1116
1117         if (runtime->buffer == NULL) {
1118                 snd_printd("snd_rawmidi_transmit_ack: output is not active!!!\n");
1119                 return -EINVAL;
1120         }
1121         spin_lock_irqsave(&runtime->lock, flags);
1122         snd_BUG_ON(runtime->avail + count > runtime->buffer_size);
1123         runtime->hw_ptr += count;
1124         runtime->hw_ptr %= runtime->buffer_size;
1125         runtime->avail += count;
1126         substream->bytes += count;
1127         if (count > 0) {
1128                 if (runtime->drain || snd_rawmidi_ready(substream))
1129                         wake_up(&runtime->sleep);
1130         }
1131         spin_unlock_irqrestore(&runtime->lock, flags);
1132         return count;
1133 }
1134
1135 /**
1136  * snd_rawmidi_transmit - copy from the buffer to the device
1137  * @substream: the rawmidi substream
1138  * @buffer: the buffer pointer
1139  * @count: the data size to transfer
1140  *
1141  * Copies data from the buffer to the device and advances the pointer.
1142  *
1143  * Returns the copied size if successful, or a negative error code on failure.
1144  */
1145 int snd_rawmidi_transmit(struct snd_rawmidi_substream *substream,
1146                          unsigned char *buffer, int count)
1147 {
1148         if (!substream->opened)
1149                 return -EBADFD;
1150         count = snd_rawmidi_transmit_peek(substream, buffer, count);
1151         if (count < 0)
1152                 return count;
1153         return snd_rawmidi_transmit_ack(substream, count);
1154 }
1155
1156 static long snd_rawmidi_kernel_write1(struct snd_rawmidi_substream *substream,
1157                                       const unsigned char __user *userbuf,
1158                                       const unsigned char *kernelbuf,
1159                                       long count)
1160 {
1161         unsigned long flags;
1162         long count1, result;
1163         struct snd_rawmidi_runtime *runtime = substream->runtime;
1164
1165         if (!kernelbuf && !userbuf)
1166                 return -EINVAL;
1167         if (snd_BUG_ON(!runtime->buffer))
1168                 return -EINVAL;
1169
1170         result = 0;
1171         spin_lock_irqsave(&runtime->lock, flags);
1172         if (substream->append) {
1173                 if ((long)runtime->avail < count) {
1174                         spin_unlock_irqrestore(&runtime->lock, flags);
1175                         return -EAGAIN;
1176                 }
1177         }
1178         while (count > 0 && runtime->avail > 0) {
1179                 count1 = runtime->buffer_size - runtime->appl_ptr;
1180                 if (count1 > count)
1181                         count1 = count;
1182                 if (count1 > (long)runtime->avail)
1183                         count1 = runtime->avail;
1184                 if (kernelbuf)
1185                         memcpy(runtime->buffer + runtime->appl_ptr,
1186                                kernelbuf + result, count1);
1187                 else if (userbuf) {
1188                         spin_unlock_irqrestore(&runtime->lock, flags);
1189                         if (copy_from_user(runtime->buffer + runtime->appl_ptr,
1190                                            userbuf + result, count1)) {
1191                                 spin_lock_irqsave(&runtime->lock, flags);
1192                                 result = result > 0 ? result : -EFAULT;
1193                                 goto __end;
1194                         }
1195                         spin_lock_irqsave(&runtime->lock, flags);
1196                 }
1197                 runtime->appl_ptr += count1;
1198                 runtime->appl_ptr %= runtime->buffer_size;
1199                 runtime->avail -= count1;
1200                 result += count1;
1201                 count -= count1;
1202         }
1203       __end:
1204         count1 = runtime->avail < runtime->buffer_size;
1205         spin_unlock_irqrestore(&runtime->lock, flags);
1206         if (count1)
1207                 snd_rawmidi_output_trigger(substream, 1);
1208         return result;
1209 }
1210
1211 long snd_rawmidi_kernel_write(struct snd_rawmidi_substream *substream,
1212                               const unsigned char *buf, long count)
1213 {
1214         return snd_rawmidi_kernel_write1(substream, NULL, buf, count);
1215 }
1216
1217 static ssize_t snd_rawmidi_write(struct file *file, const char __user *buf,
1218                                  size_t count, loff_t *offset)
1219 {
1220         long result, timeout;
1221         int count1;
1222         struct snd_rawmidi_file *rfile;
1223         struct snd_rawmidi_runtime *runtime;
1224         struct snd_rawmidi_substream *substream;
1225
1226         rfile = file->private_data;
1227         substream = rfile->output;
1228         runtime = substream->runtime;
1229         /* we cannot put an atomic message to our buffer */
1230         if (substream->append && count > runtime->buffer_size)
1231                 return -EIO;
1232         result = 0;
1233         while (count > 0) {
1234                 spin_lock_irq(&runtime->lock);
1235                 while (!snd_rawmidi_ready_append(substream, count)) {
1236                         wait_queue_t wait;
1237                         if (file->f_flags & O_NONBLOCK) {
1238                                 spin_unlock_irq(&runtime->lock);
1239                                 return result > 0 ? result : -EAGAIN;
1240                         }
1241                         init_waitqueue_entry(&wait, current);
1242                         add_wait_queue(&runtime->sleep, &wait);
1243                         set_current_state(TASK_INTERRUPTIBLE);
1244                         spin_unlock_irq(&runtime->lock);
1245                         timeout = schedule_timeout(30 * HZ);
1246                         remove_wait_queue(&runtime->sleep, &wait);
1247                         if (rfile->rmidi->card->shutdown)
1248                                 return -ENODEV;
1249                         if (signal_pending(current))
1250                                 return result > 0 ? result : -ERESTARTSYS;
1251                         if (!runtime->avail && !timeout)
1252                                 return result > 0 ? result : -EIO;
1253                         spin_lock_irq(&runtime->lock);
1254                 }
1255                 spin_unlock_irq(&runtime->lock);
1256                 count1 = snd_rawmidi_kernel_write1(substream, buf, NULL, count);
1257                 if (count1 < 0)
1258                         return result > 0 ? result : count1;
1259                 result += count1;
1260                 buf += count1;
1261                 if ((size_t)count1 < count && (file->f_flags & O_NONBLOCK))
1262                         break;
1263                 count -= count1;
1264         }
1265         if (file->f_flags & O_DSYNC) {
1266                 spin_lock_irq(&runtime->lock);
1267                 while (runtime->avail != runtime->buffer_size) {
1268                         wait_queue_t wait;
1269                         unsigned int last_avail = runtime->avail;
1270                         init_waitqueue_entry(&wait, current);
1271                         add_wait_queue(&runtime->sleep, &wait);
1272                         set_current_state(TASK_INTERRUPTIBLE);
1273                         spin_unlock_irq(&runtime->lock);
1274                         timeout = schedule_timeout(30 * HZ);
1275                         remove_wait_queue(&runtime->sleep, &wait);
1276                         if (signal_pending(current))
1277                                 return result > 0 ? result : -ERESTARTSYS;
1278                         if (runtime->avail == last_avail && !timeout)
1279                                 return result > 0 ? result : -EIO;
1280                         spin_lock_irq(&runtime->lock);
1281                 }
1282                 spin_unlock_irq(&runtime->lock);
1283         }
1284         return result;
1285 }
1286
1287 static unsigned int snd_rawmidi_poll(struct file *file, poll_table * wait)
1288 {
1289         struct snd_rawmidi_file *rfile;
1290         struct snd_rawmidi_runtime *runtime;
1291         unsigned int mask;
1292
1293         rfile = file->private_data;
1294         if (rfile->input != NULL) {
1295                 runtime = rfile->input->runtime;
1296                 snd_rawmidi_input_trigger(rfile->input, 1);
1297                 poll_wait(file, &runtime->sleep, wait);
1298         }
1299         if (rfile->output != NULL) {
1300                 runtime = rfile->output->runtime;
1301                 poll_wait(file, &runtime->sleep, wait);
1302         }
1303         mask = 0;
1304         if (rfile->input != NULL) {
1305                 if (snd_rawmidi_ready(rfile->input))
1306                         mask |= POLLIN | POLLRDNORM;
1307         }
1308         if (rfile->output != NULL) {
1309                 if (snd_rawmidi_ready(rfile->output))
1310                         mask |= POLLOUT | POLLWRNORM;
1311         }
1312         return mask;
1313 }
1314
1315 /*
1316  */
1317 #ifdef CONFIG_COMPAT
1318 #include "rawmidi_compat.c"
1319 #else
1320 #define snd_rawmidi_ioctl_compat        NULL
1321 #endif
1322
1323 /*
1324
1325  */
1326
1327 static void snd_rawmidi_proc_info_read(struct snd_info_entry *entry,
1328                                        struct snd_info_buffer *buffer)
1329 {
1330         struct snd_rawmidi *rmidi;
1331         struct snd_rawmidi_substream *substream;
1332         struct snd_rawmidi_runtime *runtime;
1333
1334         rmidi = entry->private_data;
1335         snd_iprintf(buffer, "%s\n\n", rmidi->name);
1336         mutex_lock(&rmidi->open_mutex);
1337         if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_OUTPUT) {
1338                 list_for_each_entry(substream,
1339                                     &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams,
1340                                     list) {
1341                         snd_iprintf(buffer,
1342                                     "Output %d\n"
1343                                     "  Tx bytes     : %lu\n",
1344                                     substream->number,
1345                                     (unsigned long) substream->bytes);
1346                         if (substream->opened) {
1347                                 snd_iprintf(buffer,
1348                                     "  Owner PID    : %d\n",
1349                                     pid_vnr(substream->pid));
1350                                 runtime = substream->runtime;
1351                                 snd_iprintf(buffer,
1352                                     "  Mode         : %s\n"
1353                                     "  Buffer size  : %lu\n"
1354                                     "  Avail        : %lu\n",
1355                                     runtime->oss ? "OSS compatible" : "native",
1356                                     (unsigned long) runtime->buffer_size,
1357                                     (unsigned long) runtime->avail);
1358                         }
1359                 }
1360         }
1361         if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_INPUT) {
1362                 list_for_each_entry(substream,
1363                                     &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams,
1364                                     list) {
1365                         snd_iprintf(buffer,
1366                                     "Input %d\n"
1367                                     "  Rx bytes     : %lu\n",
1368                                     substream->number,
1369                                     (unsigned long) substream->bytes);
1370                         if (substream->opened) {
1371                                 snd_iprintf(buffer,
1372                                             "  Owner PID    : %d\n",
1373                                             pid_vnr(substream->pid));
1374                                 runtime = substream->runtime;
1375                                 snd_iprintf(buffer,
1376                                             "  Buffer size  : %lu\n"
1377                                             "  Avail        : %lu\n"
1378                                             "  Overruns     : %lu\n",
1379                                             (unsigned long) runtime->buffer_size,
1380                                             (unsigned long) runtime->avail,
1381                                             (unsigned long) runtime->xruns);
1382                         }
1383                 }
1384         }
1385         mutex_unlock(&rmidi->open_mutex);
1386 }
1387
1388 /*
1389  *  Register functions
1390  */
1391
1392 static const struct file_operations snd_rawmidi_f_ops =
1393 {
1394         .owner =        THIS_MODULE,
1395         .read =         snd_rawmidi_read,
1396         .write =        snd_rawmidi_write,
1397         .open =         snd_rawmidi_open,
1398         .release =      snd_rawmidi_release,
1399         .llseek =       no_llseek,
1400         .poll =         snd_rawmidi_poll,
1401         .unlocked_ioctl =       snd_rawmidi_ioctl,
1402         .compat_ioctl = snd_rawmidi_ioctl_compat,
1403 };
1404
1405 static int snd_rawmidi_alloc_substreams(struct snd_rawmidi *rmidi,
1406                                         struct snd_rawmidi_str *stream,
1407                                         int direction,
1408                                         int count)
1409 {
1410         struct snd_rawmidi_substream *substream;
1411         int idx;
1412
1413         for (idx = 0; idx < count; idx++) {
1414                 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
1415                 if (substream == NULL) {
1416                         snd_printk(KERN_ERR "rawmidi: cannot allocate substream\n");
1417                         return -ENOMEM;
1418                 }
1419                 substream->stream = direction;
1420                 substream->number = idx;
1421                 substream->rmidi = rmidi;
1422                 substream->pstr = stream;
1423                 list_add_tail(&substream->list, &stream->substreams);
1424                 stream->substream_count++;
1425         }
1426         return 0;
1427 }
1428
1429 /**
1430  * snd_rawmidi_new - create a rawmidi instance
1431  * @card: the card instance
1432  * @id: the id string
1433  * @device: the device index
1434  * @output_count: the number of output streams
1435  * @input_count: the number of input streams
1436  * @rrawmidi: the pointer to store the new rawmidi instance
1437  *
1438  * Creates a new rawmidi instance.
1439  * Use snd_rawmidi_set_ops() to set the operators to the new instance.
1440  *
1441  * Returns zero if successful, or a negative error code on failure.
1442  */
1443 int snd_rawmidi_new(struct snd_card *card, char *id, int device,
1444                     int output_count, int input_count,
1445                     struct snd_rawmidi ** rrawmidi)
1446 {
1447         struct snd_rawmidi *rmidi;
1448         int err;
1449         static struct snd_device_ops ops = {
1450                 .dev_free = snd_rawmidi_dev_free,
1451                 .dev_register = snd_rawmidi_dev_register,
1452                 .dev_disconnect = snd_rawmidi_dev_disconnect,
1453         };
1454
1455         if (snd_BUG_ON(!card))
1456                 return -ENXIO;
1457         if (rrawmidi)
1458                 *rrawmidi = NULL;
1459         rmidi = kzalloc(sizeof(*rmidi), GFP_KERNEL);
1460         if (rmidi == NULL) {
1461                 snd_printk(KERN_ERR "rawmidi: cannot allocate\n");
1462                 return -ENOMEM;
1463         }
1464         rmidi->card = card;
1465         rmidi->device = device;
1466         mutex_init(&rmidi->open_mutex);
1467         init_waitqueue_head(&rmidi->open_wait);
1468         INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams);
1469         INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams);
1470
1471         if (id != NULL)
1472                 strlcpy(rmidi->id, id, sizeof(rmidi->id));
1473         if ((err = snd_rawmidi_alloc_substreams(rmidi,
1474                                                 &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT],
1475                                                 SNDRV_RAWMIDI_STREAM_INPUT,
1476                                                 input_count)) < 0) {
1477                 snd_rawmidi_free(rmidi);
1478                 return err;
1479         }
1480         if ((err = snd_rawmidi_alloc_substreams(rmidi,
1481                                                 &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT],
1482                                                 SNDRV_RAWMIDI_STREAM_OUTPUT,
1483                                                 output_count)) < 0) {
1484                 snd_rawmidi_free(rmidi);
1485                 return err;
1486         }
1487         if ((err = snd_device_new(card, SNDRV_DEV_RAWMIDI, rmidi, &ops)) < 0) {
1488                 snd_rawmidi_free(rmidi);
1489                 return err;
1490         }
1491         if (rrawmidi)
1492                 *rrawmidi = rmidi;
1493         return 0;
1494 }
1495
1496 static void snd_rawmidi_free_substreams(struct snd_rawmidi_str *stream)
1497 {
1498         struct snd_rawmidi_substream *substream;
1499
1500         while (!list_empty(&stream->substreams)) {
1501                 substream = list_entry(stream->substreams.next, struct snd_rawmidi_substream, list);
1502                 list_del(&substream->list);
1503                 kfree(substream);
1504         }
1505 }
1506
1507 static int snd_rawmidi_free(struct snd_rawmidi *rmidi)
1508 {
1509         if (!rmidi)
1510                 return 0;
1511
1512         snd_info_free_entry(rmidi->proc_entry);
1513         rmidi->proc_entry = NULL;
1514         mutex_lock(&register_mutex);
1515         if (rmidi->ops && rmidi->ops->dev_unregister)
1516                 rmidi->ops->dev_unregister(rmidi);
1517         mutex_unlock(&register_mutex);
1518
1519         snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT]);
1520         snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT]);
1521         if (rmidi->private_free)
1522                 rmidi->private_free(rmidi);
1523         kfree(rmidi);
1524         return 0;
1525 }
1526
1527 static int snd_rawmidi_dev_free(struct snd_device *device)
1528 {
1529         struct snd_rawmidi *rmidi = device->device_data;
1530         return snd_rawmidi_free(rmidi);
1531 }
1532
1533 #if defined(CONFIG_SND_SEQUENCER) || (defined(MODULE) && defined(CONFIG_SND_SEQUENCER_MODULE))
1534 static void snd_rawmidi_dev_seq_free(struct snd_seq_device *device)
1535 {
1536         struct snd_rawmidi *rmidi = device->private_data;
1537         rmidi->seq_dev = NULL;
1538 }
1539 #endif
1540
1541 static int snd_rawmidi_dev_register(struct snd_device *device)
1542 {
1543         int err;
1544         struct snd_info_entry *entry;
1545         char name[16];
1546         struct snd_rawmidi *rmidi = device->device_data;
1547
1548         if (rmidi->device >= SNDRV_RAWMIDI_DEVICES)
1549                 return -ENOMEM;
1550         mutex_lock(&register_mutex);
1551         if (snd_rawmidi_search(rmidi->card, rmidi->device)) {
1552                 mutex_unlock(&register_mutex);
1553                 return -EBUSY;
1554         }
1555         list_add_tail(&rmidi->list, &snd_rawmidi_devices);
1556         sprintf(name, "midiC%iD%i", rmidi->card->number, rmidi->device);
1557         if ((err = snd_register_device(SNDRV_DEVICE_TYPE_RAWMIDI,
1558                                        rmidi->card, rmidi->device,
1559                                        &snd_rawmidi_f_ops, rmidi, name)) < 0) {
1560                 snd_printk(KERN_ERR "unable to register rawmidi device %i:%i\n", rmidi->card->number, rmidi->device);
1561                 list_del(&rmidi->list);
1562                 mutex_unlock(&register_mutex);
1563                 return err;
1564         }
1565         if (rmidi->ops && rmidi->ops->dev_register &&
1566             (err = rmidi->ops->dev_register(rmidi)) < 0) {
1567                 snd_unregister_device(SNDRV_DEVICE_TYPE_RAWMIDI, rmidi->card, rmidi->device);
1568                 list_del(&rmidi->list);
1569                 mutex_unlock(&register_mutex);
1570                 return err;
1571         }
1572 #ifdef CONFIG_SND_OSSEMUL
1573         rmidi->ossreg = 0;
1574         if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1575                 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1576                                             rmidi->card, 0, &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, 0);
1579                 } else {
1580                         rmidi->ossreg++;
1581 #ifdef SNDRV_OSS_INFO_DEV_MIDI
1582                         snd_oss_info_register(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number, rmidi->name);
1583 #endif
1584                 }
1585         }
1586         if ((int)rmidi->device == amidi_map[rmidi->card->number]) {
1587                 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1588                                             rmidi->card, 1, &snd_rawmidi_f_ops,
1589                                             rmidi, name) < 0) {
1590                         snd_printk(KERN_ERR "unable to register OSS rawmidi device %i:%i\n", rmidi->card->number, 1);
1591                 } else {
1592                         rmidi->ossreg++;
1593                 }
1594         }
1595 #endif /* CONFIG_SND_OSSEMUL */
1596         mutex_unlock(&register_mutex);
1597         sprintf(name, "midi%d", rmidi->device);
1598         entry = snd_info_create_card_entry(rmidi->card, name, rmidi->card->proc_root);
1599         if (entry) {
1600                 entry->private_data = rmidi;
1601                 entry->c.text.read = snd_rawmidi_proc_info_read;
1602                 if (snd_info_register(entry) < 0) {
1603                         snd_info_free_entry(entry);
1604                         entry = NULL;
1605                 }
1606         }
1607         rmidi->proc_entry = entry;
1608 #if defined(CONFIG_SND_SEQUENCER) || (defined(MODULE) && defined(CONFIG_SND_SEQUENCER_MODULE))
1609         if (!rmidi->ops || !rmidi->ops->dev_register) { /* own registration mechanism */
1610                 if (snd_seq_device_new(rmidi->card, rmidi->device, SNDRV_SEQ_DEV_ID_MIDISYNTH, 0, &rmidi->seq_dev) >= 0) {
1611                         rmidi->seq_dev->private_data = rmidi;
1612                         rmidi->seq_dev->private_free = snd_rawmidi_dev_seq_free;
1613                         sprintf(rmidi->seq_dev->name, "MIDI %d-%d", rmidi->card->number, rmidi->device);
1614                         snd_device_register(rmidi->card, rmidi->seq_dev);
1615                 }
1616         }
1617 #endif
1618         return 0;
1619 }
1620
1621 static int snd_rawmidi_dev_disconnect(struct snd_device *device)
1622 {
1623         struct snd_rawmidi *rmidi = device->device_data;
1624         int dir;
1625
1626         mutex_lock(&register_mutex);
1627         mutex_lock(&rmidi->open_mutex);
1628         wake_up(&rmidi->open_wait);
1629         list_del_init(&rmidi->list);
1630         for (dir = 0; dir < 2; dir++) {
1631                 struct snd_rawmidi_substream *s;
1632                 list_for_each_entry(s, &rmidi->streams[dir].substreams, list) {
1633                         if (s->runtime)
1634                                 wake_up(&s->runtime->sleep);
1635                 }
1636         }
1637
1638 #ifdef CONFIG_SND_OSSEMUL
1639         if (rmidi->ossreg) {
1640                 if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1641                         snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 0);
1642 #ifdef SNDRV_OSS_INFO_DEV_MIDI
1643                         snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number);
1644 #endif
1645                 }
1646                 if ((int)rmidi->device == amidi_map[rmidi->card->number])
1647                         snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 1);
1648                 rmidi->ossreg = 0;
1649         }
1650 #endif /* CONFIG_SND_OSSEMUL */
1651         snd_unregister_device(SNDRV_DEVICE_TYPE_RAWMIDI, rmidi->card, rmidi->device);
1652         mutex_unlock(&rmidi->open_mutex);
1653         mutex_unlock(&register_mutex);
1654         return 0;
1655 }
1656
1657 /**
1658  * snd_rawmidi_set_ops - set the rawmidi operators
1659  * @rmidi: the rawmidi instance
1660  * @stream: the stream direction, SNDRV_RAWMIDI_STREAM_XXX
1661  * @ops: the operator table
1662  *
1663  * Sets the rawmidi operators for the given stream direction.
1664  */
1665 void snd_rawmidi_set_ops(struct snd_rawmidi *rmidi, int stream,
1666                          struct snd_rawmidi_ops *ops)
1667 {
1668         struct snd_rawmidi_substream *substream;
1669
1670         list_for_each_entry(substream, &rmidi->streams[stream].substreams, list)
1671                 substream->ops = ops;
1672 }
1673
1674 /*
1675  *  ENTRY functions
1676  */
1677
1678 static int __init alsa_rawmidi_init(void)
1679 {
1680
1681         snd_ctl_register_ioctl(snd_rawmidi_control_ioctl);
1682         snd_ctl_register_ioctl_compat(snd_rawmidi_control_ioctl);
1683 #ifdef CONFIG_SND_OSSEMUL
1684         { int i;
1685         /* check device map table */
1686         for (i = 0; i < SNDRV_CARDS; i++) {
1687                 if (midi_map[i] < 0 || midi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1688                         snd_printk(KERN_ERR "invalid midi_map[%d] = %d\n", i, midi_map[i]);
1689                         midi_map[i] = 0;
1690                 }
1691                 if (amidi_map[i] < 0 || amidi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1692                         snd_printk(KERN_ERR "invalid amidi_map[%d] = %d\n", i, amidi_map[i]);
1693                         amidi_map[i] = 1;
1694                 }
1695         }
1696         }
1697 #endif /* CONFIG_SND_OSSEMUL */
1698         return 0;
1699 }
1700
1701 static void __exit alsa_rawmidi_exit(void)
1702 {
1703         snd_ctl_unregister_ioctl(snd_rawmidi_control_ioctl);
1704         snd_ctl_unregister_ioctl_compat(snd_rawmidi_control_ioctl);
1705 }
1706
1707 module_init(alsa_rawmidi_init)
1708 module_exit(alsa_rawmidi_exit)
1709
1710 EXPORT_SYMBOL(snd_rawmidi_output_params);
1711 EXPORT_SYMBOL(snd_rawmidi_input_params);
1712 EXPORT_SYMBOL(snd_rawmidi_drop_output);
1713 EXPORT_SYMBOL(snd_rawmidi_drain_output);
1714 EXPORT_SYMBOL(snd_rawmidi_drain_input);
1715 EXPORT_SYMBOL(snd_rawmidi_receive);
1716 EXPORT_SYMBOL(snd_rawmidi_transmit_empty);
1717 EXPORT_SYMBOL(snd_rawmidi_transmit_peek);
1718 EXPORT_SYMBOL(snd_rawmidi_transmit_ack);
1719 EXPORT_SYMBOL(snd_rawmidi_transmit);
1720 EXPORT_SYMBOL(snd_rawmidi_new);
1721 EXPORT_SYMBOL(snd_rawmidi_set_ops);
1722 EXPORT_SYMBOL(snd_rawmidi_info_select);
1723 EXPORT_SYMBOL(snd_rawmidi_kernel_open);
1724 EXPORT_SYMBOL(snd_rawmidi_kernel_release);
1725 EXPORT_SYMBOL(snd_rawmidi_kernel_read);
1726 EXPORT_SYMBOL(snd_rawmidi_kernel_write);