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 (signal_pending(current)) {
 428                         err = -ERESTARTSYS;
 429                         break;
 430                 }
 431         }
 432         remove_wait_queue(&rmidi->open_wait, &wait);
 433         if (err < 0) {
 434                 kfree(rawmidi_file);
 435                 goto __error;
 436         }
 437 #ifdef CONFIG_SND_OSSEMUL
 438         if (rawmidi_file->input && rawmidi_file->input->runtime)
 439                 rawmidi_file->input->runtime->oss = (maj == SOUND_MAJOR);
 440         if (rawmidi_file->output && rawmidi_file->output->runtime)
 441                 rawmidi_file->output->runtime->oss = (maj == SOUND_MAJOR);
 442 #endif
 443         file->private_data = rawmidi_file;
 444         mutex_unlock(&rmidi->open_mutex);
 445         snd_card_unref(rmidi->card);
 446         return 0;
 447
 448  __error:
 449         snd_card_file_remove(card, file);
 450  __error_card:
 451         mutex_unlock(&rmidi->open_mutex);
 452         module_put(rmidi->card->module);
 453         snd_card_unref(rmidi->card);
 454         return err;
 455 }
 456
 457 static void close_substream(struct snd_rawmidi *rmidi,
 458                             struct snd_rawmidi_substream *substream,
 459                             int cleanup)
 460 {
 461         if (--substream->use_count)
 462                 return;
 463
 464         if (cleanup) {
 465                 if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
 466                         snd_rawmidi_input_trigger(substream, 0);
 467                 else {
 468                         if (substream->active_sensing) {
 469                                 unsigned char buf = 0xfe;
 470                                 /* sending single active sensing message
 471                                  * to shut the device up
 472                                  */
 473                                 snd_rawmidi_kernel_write(substream, &buf, 1);
 474                         }
 475                         if (snd_rawmidi_drain_output(substream) == -ERESTARTSYS)
 476                                 snd_rawmidi_output_trigger(substream, 0);
 477                 }
 478         }
 479         substream->ops->close(substream);
 480         if (substream->runtime->private_free)
 481                 substream->runtime->private_free(substream);
 482         snd_rawmidi_runtime_free(substream);
 483         substream->opened = 0;
 484         substream->append = 0;
 485         put_pid(substream->pid);
 486         substream->pid = NULL;
 487         rmidi->streams[substream->stream].substream_opened--;
 488 }
 489
 490 static void rawmidi_release_priv(struct snd_rawmidi_file *rfile)
 491 {
 492         struct snd_rawmidi *rmidi;
 493
 494         rmidi = rfile->rmidi;
 495         mutex_lock(&rmidi->open_mutex);
 496         if (rfile->input) {
 497                 close_substream(rmidi, rfile->input, 1);
 498                 rfile->input = NULL;
 499         }
 500         if (rfile->output) {
 501                 close_substream(rmidi, rfile->output, 1);
 502                 rfile->output = NULL;
 503         }
 504         rfile->rmidi = NULL;
 505         mutex_unlock(&rmidi->open_mutex);
 506         wake_up(&rmidi->open_wait);
 507 }
 508
 509 /* called from sound/core/seq/seq_midi.c */
 510 int snd_rawmidi_kernel_release(struct snd_rawmidi_file *rfile)
 511 {
 512         struct snd_rawmidi *rmidi;
 513
 514         if (snd_BUG_ON(!rfile))
 515                 return -ENXIO;
 516
 517         rmidi = rfile->rmidi;
 518         rawmidi_release_priv(rfile);
 519         module_put(rmidi->card->module);
 520         return 0;
 521 }
 522
 523 static int snd_rawmidi_release(struct inode *inode, struct file *file)
 524 {
 525         struct snd_rawmidi_file *rfile;
 526         struct snd_rawmidi *rmidi;
 527         struct module *module;
 528
 529         rfile = file->private_data;
 530         rmidi = rfile->rmidi;
 531         rawmidi_release_priv(rfile);
 532         kfree(rfile);
 533         module = rmidi->card->module;
 534         snd_card_file_remove(rmidi->card, file);
 535         module_put(module);
 536         return 0;
 537 }
 538
 539 static int snd_rawmidi_info(struct snd_rawmidi_substream *substream,
 540                             struct snd_rawmidi_info *info)
 541 {
 542         struct snd_rawmidi *rmidi;
 543
 544         if (substream == NULL)
 545                 return -ENODEV;
 546         rmidi = substream->rmidi;
 547         memset(info, 0, sizeof(*info));
 548         info->card = rmidi->card->number;
 549         info->device = rmidi->device;
 550         info->subdevice = substream->number;
 551         info->stream = substream->stream;
 552         info->flags = rmidi->info_flags;
 553         strcpy(info->id, rmidi->id);
 554         strcpy(info->name, rmidi->name);
 555         strcpy(info->subname, substream->name);
 556         info->subdevices_count = substream->pstr->substream_count;
 557         info->subdevices_avail = (substream->pstr->substream_count -
 558                                   substream->pstr->substream_opened);
 559         return 0;
 560 }
 561
 562 static int snd_rawmidi_info_user(struct snd_rawmidi_substream *substream,
 563                                  struct snd_rawmidi_info __user * _info)
 564 {
 565         struct snd_rawmidi_info info;
 566         int err;
 567         if ((err = snd_rawmidi_info(substream, &info)) < 0)
 568                 return err;
 569         if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
 570                 return -EFAULT;
 571         return 0;
 572 }
 573
 574 int snd_rawmidi_info_select(struct snd_card *card, struct snd_rawmidi_info *info)
 575 {
 576         struct snd_rawmidi *rmidi;
 577         struct snd_rawmidi_str *pstr;
 578         struct snd_rawmidi_substream *substream;
 579
 580         mutex_lock(&register_mutex);
 581         rmidi = snd_rawmidi_search(card, info->device);
 582         mutex_unlock(&register_mutex);
 583         if (!rmidi)
 584                 return -ENXIO;
 585         if (info->stream < 0 || info->stream > 1)
 586                 return -EINVAL;
 587         pstr = &rmidi->streams[info->stream];
 588         if (pstr->substream_count == 0)
 589                 return -ENOENT;
 590         if (info->subdevice >= pstr->substream_count)
 591                 return -ENXIO;
 592         list_for_each_entry(substream, &pstr->substreams, list) {
 593                 if ((unsigned int)substream->number == info->subdevice)
 594                         return snd_rawmidi_info(substream, info);
 595         }
 596         return -ENXIO;
 597 }
 598
 599 static int snd_rawmidi_info_select_user(struct snd_card *card,
 600                                         struct snd_rawmidi_info __user *_info)
 601 {
 602         int err;
 603         struct snd_rawmidi_info info;
 604         if (get_user(info.device, &_info->device))
 605                 return -EFAULT;
 606         if (get_user(info.stream, &_info->stream))
 607                 return -EFAULT;
 608         if (get_user(info.subdevice, &_info->subdevice))
 609                 return -EFAULT;
 610         if ((err = snd_rawmidi_info_select(card, &info)) < 0)
 611                 return err;
 612         if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
 613                 return -EFAULT;
 614         return 0;
 615 }
 616
 617 int snd_rawmidi_output_params(struct snd_rawmidi_substream *substream,
 618                               struct snd_rawmidi_params * params)
 619 {
 620         char *newbuf;
 621         struct snd_rawmidi_runtime *runtime = substream->runtime;
 622
 623         if (substream->append && substream->use_count > 1)
 624                 return -EBUSY;
 625         snd_rawmidi_drain_output(substream);
 626         if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L) {
 627                 return -EINVAL;
 628         }
 629         if (params->avail_min < 1 || params->avail_min > params->buffer_size) {
 630                 return -EINVAL;
 631         }
 632         if (params->buffer_size != runtime->buffer_size) {
 633                 newbuf = krealloc(runtime->buffer, params->buffer_size,
 634                                   GFP_KERNEL);
 635                 if (!newbuf)
 636                         return -ENOMEM;
 637                 runtime->buffer = newbuf;
 638                 runtime->buffer_size = params->buffer_size;
 639                 runtime->avail = runtime->buffer_size;
 640         }
 641         runtime->avail_min = params->avail_min;
 642         substream->active_sensing = !params->no_active_sensing;
 643         return 0;
 644 }
 645
 646 int snd_rawmidi_input_params(struct snd_rawmidi_substream *substream,
 647                              struct snd_rawmidi_params * params)
 648 {
 649         char *newbuf;
 650         struct snd_rawmidi_runtime *runtime = substream->runtime;
 651
 652         snd_rawmidi_drain_input(substream);
 653         if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L) {
 654                 return -EINVAL;
 655         }
 656         if (params->avail_min < 1 || params->avail_min > params->buffer_size) {
 657                 return -EINVAL;
 658         }
 659         if (params->buffer_size != runtime->buffer_size) {
 660                 newbuf = krealloc(runtime->buffer, params->buffer_size,
 661                                   GFP_KERNEL);
 662                 if (!newbuf)
 663                         return -ENOMEM;
 664                 runtime->buffer = newbuf;
 665                 runtime->buffer_size = params->buffer_size;
 666         }
 667         runtime->avail_min = params->avail_min;
 668         return 0;
 669 }
 670
 671 static int snd_rawmidi_output_status(struct snd_rawmidi_substream *substream,
 672                                      struct snd_rawmidi_status * status)
 673 {
 674         struct snd_rawmidi_runtime *runtime = substream->runtime;
 675
 676         memset(status, 0, sizeof(*status));
 677         status->stream = SNDRV_RAWMIDI_STREAM_OUTPUT;
 678         spin_lock_irq(&runtime->lock);
 679         status->avail = runtime->avail;
 680         spin_unlock_irq(&runtime->lock);
 681         return 0;
 682 }
 683
 684 static int snd_rawmidi_input_status(struct snd_rawmidi_substream *substream,
 685                                     struct snd_rawmidi_status * status)
 686 {
 687         struct snd_rawmidi_runtime *runtime = substream->runtime;
 688
 689         memset(status, 0, sizeof(*status));
 690         status->stream = SNDRV_RAWMIDI_STREAM_INPUT;
 691         spin_lock_irq(&runtime->lock);
 692         status->avail = runtime->avail;
 693         status->xruns = runtime->xruns;
 694         runtime->xruns = 0;
 695         spin_unlock_irq(&runtime->lock);
 696         return 0;
 697 }
 698
 699 static long snd_rawmidi_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 700 {
 701         struct snd_rawmidi_file *rfile;
 702         void __user *argp = (void __user *)arg;
 703
 704         rfile = file->private_data;
 705         if (((cmd >> 8) & 0xff) != 'W')
 706                 return -ENOTTY;
 707         switch (cmd) {
 708         case SNDRV_RAWMIDI_IOCTL_PVERSION:
 709                 return put_user(SNDRV_RAWMIDI_VERSION, (int __user *)argp) ? -EFAULT : 0;
 710         case SNDRV_RAWMIDI_IOCTL_INFO:
 711         {
 712                 int stream;
 713                 struct snd_rawmidi_info __user *info = argp;
 714                 if (get_user(stream, &info->stream))
 715                         return -EFAULT;
 716                 switch (stream) {
 717                 case SNDRV_RAWMIDI_STREAM_INPUT:
 718                         return snd_rawmidi_info_user(rfile->input, info);
 719                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
 720                         return snd_rawmidi_info_user(rfile->output, info);
 721                 default:
 722                         return -EINVAL;
 723                 }
 724         }
 725         case SNDRV_RAWMIDI_IOCTL_PARAMS:
 726         {
 727                 struct snd_rawmidi_params params;
 728                 if (copy_from_user(&params, argp, sizeof(struct snd_rawmidi_params)))
 729                         return -EFAULT;
 730                 switch (params.stream) {
 731                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
 732                         if (rfile->output == NULL)
 733                                 return -EINVAL;
 734                         return snd_rawmidi_output_params(rfile->output, &params);
 735                 case SNDRV_RAWMIDI_STREAM_INPUT:
 736                         if (rfile->input == NULL)
 737                                 return -EINVAL;
 738                         return snd_rawmidi_input_params(rfile->input, &params);
 739                 default:
 740                         return -EINVAL;
 741                 }
 742         }
 743         case SNDRV_RAWMIDI_IOCTL_STATUS:
 744         {
 745                 int err = 0;
 746                 struct snd_rawmidi_status status;
 747                 if (copy_from_user(&status, argp, sizeof(struct snd_rawmidi_status)))
 748                         return -EFAULT;
 749                 switch (status.stream) {
 750                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
 751                         if (rfile->output == NULL)
 752                                 return -EINVAL;
 753                         err = snd_rawmidi_output_status(rfile->output, &status);
 754                         break;
 755                 case SNDRV_RAWMIDI_STREAM_INPUT:
 756                         if (rfile->input == NULL)
 757                                 return -EINVAL;
 758                         err = snd_rawmidi_input_status(rfile->input, &status);
 759                         break;
 760                 default:
 761                         return -EINVAL;
 762                 }
 763                 if (err < 0)
 764                         return err;
 765                 if (copy_to_user(argp, &status, sizeof(struct snd_rawmidi_status)))
 766                         return -EFAULT;
 767                 return 0;
 768         }
 769         case SNDRV_RAWMIDI_IOCTL_DROP:
 770         {
 771                 int val;
 772                 if (get_user(val, (int __user *) argp))
 773                         return -EFAULT;
 774                 switch (val) {
 775                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
 776                         if (rfile->output == NULL)
 777                                 return -EINVAL;
 778                         return snd_rawmidi_drop_output(rfile->output);
 779                 default:
 780                         return -EINVAL;
 781                 }
 782         }
 783         case SNDRV_RAWMIDI_IOCTL_DRAIN:
 784         {
 785                 int val;
 786                 if (get_user(val, (int __user *) argp))
 787                         return -EFAULT;
 788                 switch (val) {
 789                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
 790                         if (rfile->output == NULL)
 791                                 return -EINVAL;
 792                         return snd_rawmidi_drain_output(rfile->output);
 793                 case SNDRV_RAWMIDI_STREAM_INPUT:
 794                         if (rfile->input == NULL)
 795                                 return -EINVAL;
 796                         return snd_rawmidi_drain_input(rfile->input);
 797                 default:
 798                         return -EINVAL;
 799                 }
 800         }
 801 #ifdef CONFIG_SND_DEBUG
 802         default:
 803                 snd_printk(KERN_WARNING "rawmidi: unknown command = 0x%x\n", cmd);
 804 #endif
 805         }
 806         return -ENOTTY;
 807 }
 808
 809 static int snd_rawmidi_control_ioctl(struct snd_card *card,
 810                                      struct snd_ctl_file *control,
 811                                      unsigned int cmd,
 812                                      unsigned long arg)
 813 {
 814         void __user *argp = (void __user *)arg;
 815
 816         switch (cmd) {
 817         case SNDRV_CTL_IOCTL_RAWMIDI_NEXT_DEVICE:
 818         {
 819                 int device;
 820
 821                 if (get_user(device, (int __user *)argp))
 822                         return -EFAULT;
 823                 if (device >= SNDRV_RAWMIDI_DEVICES) /* next device is -1 */
 824                         device = SNDRV_RAWMIDI_DEVICES - 1;
 825                 mutex_lock(&register_mutex);
 826                 device = device < 0 ? 0 : device + 1;
 827                 while (device < SNDRV_RAWMIDI_DEVICES) {
 828                         if (snd_rawmidi_search(card, device))
 829                                 break;
 830                         device++;
 831                 }
 832                 if (device == SNDRV_RAWMIDI_DEVICES)
 833                         device = -1;
 834                 mutex_unlock(&register_mutex);
 835                 if (put_user(device, (int __user *)argp))
 836                         return -EFAULT;
 837                 return 0;
 838         }
 839         case SNDRV_CTL_IOCTL_RAWMIDI_PREFER_SUBDEVICE:
 840         {
 841                 int val;
 842
 843                 if (get_user(val, (int __user *)argp))
 844                         return -EFAULT;
 845                 control->prefer_rawmidi_subdevice = val;
 846                 return 0;
 847         }
 848         case SNDRV_CTL_IOCTL_RAWMIDI_INFO:
 849                 return snd_rawmidi_info_select_user(card, argp);
 850         }
 851         return -ENOIOCTLCMD;
 852 }
 853
 854 /**
 855  * snd_rawmidi_receive - receive the input data from the device
 856  * @substream: the rawmidi substream
 857  * @buffer: the buffer pointer
 858  * @count: the data size to read
 859  *
 860  * Reads the data from the internal buffer.
 861  *
 862  * Returns the size of read data, or a negative error code on failure.
 863  */
 864 int snd_rawmidi_receive(struct snd_rawmidi_substream *substream,
 865                         const unsigned char *buffer, int count)
 866 {
 867         unsigned long flags;
 868         int result = 0, count1;
 869         struct snd_rawmidi_runtime *runtime = substream->runtime;
 870
 871         if (!substream->opened)
 872                 return -EBADFD;
 873         if (runtime->buffer == NULL) {
 874                 snd_printd("snd_rawmidi_receive: input is not active!!!\n");
 875                 return -EINVAL;
 876         }
 877         spin_lock_irqsave(&runtime->lock, flags);
 878         if (count == 1) {       /* special case, faster code */
 879                 substream->bytes++;
 880                 if (runtime->avail < runtime->buffer_size) {
 881                         runtime->buffer[runtime->hw_ptr++] = buffer[0];
 882                         runtime->hw_ptr %= runtime->buffer_size;
 883                         runtime->avail++;
 884                         result++;
 885                 } else {
 886                         runtime->xruns++;
 887                 }
 888         } else {
 889                 substream->bytes += count;
 890                 count1 = runtime->buffer_size - runtime->hw_ptr;
 891                 if (count1 > count)
 892                         count1 = count;
 893                 if (count1 > (int)(runtime->buffer_size - runtime->avail))
 894                         count1 = runtime->buffer_size - runtime->avail;
 895                 memcpy(runtime->buffer + runtime->hw_ptr, buffer, count1);
 896                 runtime->hw_ptr += count1;
 897                 runtime->hw_ptr %= runtime->buffer_size;
 898                 runtime->avail += count1;
 899                 count -= count1;
 900                 result += count1;
 901                 if (count > 0) {
 902                         buffer += count1;
 903                         count1 = count;
 904                         if (count1 > (int)(runtime->buffer_size - runtime->avail)) {
 905                                 count1 = runtime->buffer_size - runtime->avail;
 906                                 runtime->xruns += count - count1;
 907                         }
 908                         if (count1 > 0) {
 909                                 memcpy(runtime->buffer, buffer, count1);
 910                                 runtime->hw_ptr = count1;
 911                                 runtime->avail += count1;
 912                                 result += count1;
 913                         }
 914                 }
 915         }
 916         if (result > 0) {
 917                 if (runtime->event)
 918                         schedule_work(&runtime->event_work);
 919                 else if (snd_rawmidi_ready(substream))
 920                         wake_up(&runtime->sleep);
 921         }
 922         spin_unlock_irqrestore(&runtime->lock, flags);
 923         return result;
 924 }
 925
 926 static long snd_rawmidi_kernel_read1(struct snd_rawmidi_substream *substream,
 927                                      unsigned char __user *userbuf,
 928                                      unsigned char *kernelbuf, long count)
 929 {
 930         unsigned long flags;
 931         long result = 0, count1;
 932         struct snd_rawmidi_runtime *runtime = substream->runtime;
 933
 934         while (count > 0 && runtime->avail) {
 935                 count1 = runtime->buffer_size - runtime->appl_ptr;
 936                 if (count1 > count)
 937                         count1 = count;
 938                 spin_lock_irqsave(&runtime->lock, flags);
 939                 if (count1 > (int)runtime->avail)
 940                         count1 = runtime->avail;
 941                 if (kernelbuf)
 942                         memcpy(kernelbuf + result, runtime->buffer + runtime->appl_ptr, count1);
 943                 if (userbuf) {
 944                         spin_unlock_irqrestore(&runtime->lock, flags);
 945                         if (copy_to_user(userbuf + result,
 946                                          runtime->buffer + runtime->appl_ptr, count1)) {
 947                                 return result > 0 ? result : -EFAULT;
 948                         }
 949                         spin_lock_irqsave(&runtime->lock, flags);
 950                 }
 951                 runtime->appl_ptr += count1;
 952                 runtime->appl_ptr %= runtime->buffer_size;
 953                 runtime->avail -= count1;
 954                 spin_unlock_irqrestore(&runtime->lock, flags);
 955                 result += count1;
 956                 count -= count1;
 957         }
 958         return result;
 959 }
 960
 961 long snd_rawmidi_kernel_read(struct snd_rawmidi_substream *substream,
 962                              unsigned char *buf, long count)
 963 {
 964         snd_rawmidi_input_trigger(substream, 1);
 965         return snd_rawmidi_kernel_read1(substream, NULL/*userbuf*/, buf, count);
 966 }
 967
 968 static ssize_t snd_rawmidi_read(struct file *file, char __user *buf, size_t count,
 969                                 loff_t *offset)
 970 {
 971         long result;
 972         int count1;
 973         struct snd_rawmidi_file *rfile;
 974         struct snd_rawmidi_substream *substream;
 975         struct snd_rawmidi_runtime *runtime;
 976
 977         rfile = file->private_data;
 978         substream = rfile->input;
 979         if (substream == NULL)
 980                 return -EIO;
 981         runtime = substream->runtime;
 982         snd_rawmidi_input_trigger(substream, 1);
 983         result = 0;
 984         while (count > 0) {
 985                 spin_lock_irq(&runtime->lock);
 986                 while (!snd_rawmidi_ready(substream)) {
 987                         wait_queue_t wait;
 988                         if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
 989                                 spin_unlock_irq(&runtime->lock);
 990                                 return result > 0 ? result : -EAGAIN;
 991                         }
 992                         init_waitqueue_entry(&wait, current);
 993                         add_wait_queue(&runtime->sleep, &wait);
 994                         set_current_state(TASK_INTERRUPTIBLE);
 995                         spin_unlock_irq(&runtime->lock);
 996                         schedule();
 997                         remove_wait_queue(&runtime->sleep, &wait);
 998                         if (signal_pending(current))
 999                                 return result > 0 ? result : -ERESTARTSYS;
1000                         if (!runtime->avail)
1001                                 return result > 0 ? result : -EIO;
1002                         spin_lock_irq(&runtime->lock);
1003                 }
1004                 spin_unlock_irq(&runtime->lock);
1005                 count1 = snd_rawmidi_kernel_read1(substream,
1006                                                   (unsigned char __user *)buf,
1007                                                   NULL/*kernelbuf*/,
1008                                                   count);
1009                 if (count1 < 0)
1010                         return result > 0 ? result : count1;
1011                 result += count1;
1012                 buf += count1;
1013                 count -= count1;
1014         }
1015         return result;
1016 }
1017
1018 /**
1019  * snd_rawmidi_transmit_empty - check whether the output buffer is empty
1020  * @substream: the rawmidi substream
1021  *
1022  * Returns 1 if the internal output buffer is empty, 0 if not.
1023  */
1024 int snd_rawmidi_transmit_empty(struct snd_rawmidi_substream *substream)
1025 {
1026         struct snd_rawmidi_runtime *runtime = substream->runtime;
1027         int result;
1028         unsigned long flags;
1029
1030         if (runtime->buffer == NULL) {
1031                 snd_printd("snd_rawmidi_transmit_empty: output is not active!!!\n");
1032                 return 1;
1033         }
1034         spin_lock_irqsave(&runtime->lock, flags);
1035         result = runtime->avail >= runtime->buffer_size;
1036         spin_unlock_irqrestore(&runtime->lock, flags);
1037         return result;
1038 }
1039
1040 /**
1041  * snd_rawmidi_transmit_peek - copy data from the internal buffer
1042  * @substream: the rawmidi substream
1043  * @buffer: the buffer pointer
1044  * @count: data size to transfer
1045  *
1046  * Copies data from the internal output buffer to the given buffer.
1047  *
1048  * Call this in the interrupt handler when the midi output is ready,
1049  * and call snd_rawmidi_transmit_ack() after the transmission is
1050  * finished.
1051  *
1052  * Returns the size of copied data, or a negative error code on failure.
1053  */
1054 int snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
1055                               unsigned char *buffer, int count)
1056 {
1057         unsigned long flags;
1058         int result, count1;
1059         struct snd_rawmidi_runtime *runtime = substream->runtime;
1060
1061         if (runtime->buffer == NULL) {
1062                 snd_printd("snd_rawmidi_transmit_peek: output is not active!!!\n");
1063                 return -EINVAL;
1064         }
1065         result = 0;
1066         spin_lock_irqsave(&runtime->lock, flags);
1067         if (runtime->avail >= runtime->buffer_size) {
1068                 /* warning: lowlevel layer MUST trigger down the hardware */
1069                 goto __skip;
1070         }
1071         if (count == 1) {       /* special case, faster code */
1072                 *buffer = runtime->buffer[runtime->hw_ptr];
1073                 result++;
1074         } else {
1075                 count1 = runtime->buffer_size - runtime->hw_ptr;
1076                 if (count1 > count)
1077                         count1 = count;
1078                 if (count1 > (int)(runtime->buffer_size - runtime->avail))
1079                         count1 = runtime->buffer_size - runtime->avail;
1080                 memcpy(buffer, runtime->buffer + runtime->hw_ptr, count1);
1081                 count -= count1;
1082                 result += count1;
1083                 if (count > 0) {
1084                         if (count > (int)(runtime->buffer_size - runtime->avail - count1))
1085                                 count = runtime->buffer_size - runtime->avail - count1;
1086                         memcpy(buffer + count1, runtime->buffer, count);
1087                         result += count;
1088                 }
1089         }
1090       __skip:
1091         spin_unlock_irqrestore(&runtime->lock, flags);
1092         return result;
1093 }
1094
1095 /**
1096  * snd_rawmidi_transmit_ack - acknowledge the transmission
1097  * @substream: the rawmidi substream
1098  * @count: the tranferred count
1099  *
1100  * Advances the hardware pointer for the internal output buffer with
1101  * the given size and updates the condition.
1102  * Call after the transmission is finished.
1103  *
1104  * Returns the advanced size if successful, or a negative error code on failure.
1105  */
1106 int snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count)
1107 {
1108         unsigned long flags;
1109         struct snd_rawmidi_runtime *runtime = substream->runtime;
1110
1111         if (runtime->buffer == NULL) {
1112                 snd_printd("snd_rawmidi_transmit_ack: output is not active!!!\n");
1113                 return -EINVAL;
1114         }
1115         spin_lock_irqsave(&runtime->lock, flags);
1116         snd_BUG_ON(runtime->avail + count > runtime->buffer_size);
1117         runtime->hw_ptr += count;
1118         runtime->hw_ptr %= runtime->buffer_size;
1119         runtime->avail += count;
1120         substream->bytes += count;
1121         if (count > 0) {
1122                 if (runtime->drain || snd_rawmidi_ready(substream))
1123                         wake_up(&runtime->sleep);
1124         }
1125         spin_unlock_irqrestore(&runtime->lock, flags);
1126         return count;
1127 }
1128
1129 /**
1130  * snd_rawmidi_transmit - copy from the buffer to the device
1131  * @substream: the rawmidi substream
1132  * @buffer: the buffer pointer
1133  * @count: the data size to transfer
1134  *
1135  * Copies data from the buffer to the device and advances the pointer.
1136  *
1137  * Returns the copied size if successful, or a negative error code on failure.
1138  */
1139 int snd_rawmidi_transmit(struct snd_rawmidi_substream *substream,
1140                          unsigned char *buffer, int count)
1141 {
1142         if (!substream->opened)
1143                 return -EBADFD;
1144         count = snd_rawmidi_transmit_peek(substream, buffer, count);
1145         if (count < 0)
1146                 return count;
1147         return snd_rawmidi_transmit_ack(substream, count);
1148 }
1149
1150 static long snd_rawmidi_kernel_write1(struct snd_rawmidi_substream *substream,
1151                                       const unsigned char __user *userbuf,
1152                                       const unsigned char *kernelbuf,
1153                                       long count)
1154 {
1155         unsigned long flags;
1156         long count1, result;
1157         struct snd_rawmidi_runtime *runtime = substream->runtime;
1158
1159         if (snd_BUG_ON(!kernelbuf && !userbuf))
1160                 return -EINVAL;
1161         if (snd_BUG_ON(!runtime->buffer))
1162                 return -EINVAL;
1163
1164         result = 0;
1165         spin_lock_irqsave(&runtime->lock, flags);
1166         if (substream->append) {
1167                 if ((long)runtime->avail < count) {
1168                         spin_unlock_irqrestore(&runtime->lock, flags);
1169                         return -EAGAIN;
1170                 }
1171         }
1172         while (count > 0 && runtime->avail > 0) {
1173                 count1 = runtime->buffer_size - runtime->appl_ptr;
1174                 if (count1 > count)
1175                         count1 = count;
1176                 if (count1 > (long)runtime->avail)
1177                         count1 = runtime->avail;
1178                 if (kernelbuf)
1179                         memcpy(runtime->buffer + runtime->appl_ptr,
1180                                kernelbuf + result, count1);
1181                 else if (userbuf) {
1182                         spin_unlock_irqrestore(&runtime->lock, flags);
1183                         if (copy_from_user(runtime->buffer + runtime->appl_ptr,
1184                                            userbuf + result, count1)) {
1185                                 spin_lock_irqsave(&runtime->lock, flags);
1186                                 result = result > 0 ? result : -EFAULT;
1187                                 goto __end;
1188                         }
1189                         spin_lock_irqsave(&runtime->lock, flags);
1190                 }
1191                 runtime->appl_ptr += count1;
1192                 runtime->appl_ptr %= runtime->buffer_size;
1193                 runtime->avail -= count1;
1194                 result += count1;
1195                 count -= count1;
1196         }
1197       __end:
1198         count1 = runtime->avail < runtime->buffer_size;
1199         spin_unlock_irqrestore(&runtime->lock, flags);
1200         if (count1)
1201                 snd_rawmidi_output_trigger(substream, 1);
1202         return result;
1203 }
1204
1205 long snd_rawmidi_kernel_write(struct snd_rawmidi_substream *substream,
1206                               const unsigned char *buf, long count)
1207 {
1208         return snd_rawmidi_kernel_write1(substream, NULL, buf, count);
1209 }
1210
1211 static ssize_t snd_rawmidi_write(struct file *file, const char __user *buf,
1212                                  size_t count, loff_t *offset)
1213 {
1214         long result, timeout;
1215         int count1;
1216         struct snd_rawmidi_file *rfile;
1217         struct snd_rawmidi_runtime *runtime;
1218         struct snd_rawmidi_substream *substream;
1219
1220         rfile = file->private_data;
1221         substream = rfile->output;
1222         runtime = substream->runtime;
1223         /* we cannot put an atomic message to our buffer */
1224         if (substream->append && count > runtime->buffer_size)
1225                 return -EIO;
1226         result = 0;
1227         while (count > 0) {
1228                 spin_lock_irq(&runtime->lock);
1229                 while (!snd_rawmidi_ready_append(substream, count)) {
1230                         wait_queue_t wait;
1231                         if (file->f_flags & O_NONBLOCK) {
1232                                 spin_unlock_irq(&runtime->lock);
1233                                 return result > 0 ? result : -EAGAIN;
1234                         }
1235                         init_waitqueue_entry(&wait, current);
1236                         add_wait_queue(&runtime->sleep, &wait);
1237                         set_current_state(TASK_INTERRUPTIBLE);
1238                         spin_unlock_irq(&runtime->lock);
1239                         timeout = schedule_timeout(30 * HZ);
1240                         remove_wait_queue(&runtime->sleep, &wait);
1241                         if (signal_pending(current))
1242                                 return result > 0 ? result : -ERESTARTSYS;
1243                         if (!runtime->avail && !timeout)
1244                                 return result > 0 ? result : -EIO;
1245                         spin_lock_irq(&runtime->lock);
1246                 }
1247                 spin_unlock_irq(&runtime->lock);
1248                 count1 = snd_rawmidi_kernel_write1(substream, buf, NULL, count);
1249                 if (count1 < 0)
1250                         return result > 0 ? result : count1;
1251                 result += count1;
1252                 buf += count1;
1253                 if ((size_t)count1 < count && (file->f_flags & O_NONBLOCK))
1254                         break;
1255                 count -= count1;
1256         }
1257         if (file->f_flags & O_DSYNC) {
1258                 spin_lock_irq(&runtime->lock);
1259                 while (runtime->avail != runtime->buffer_size) {
1260                         wait_queue_t wait;
1261                         unsigned int last_avail = runtime->avail;
1262                         init_waitqueue_entry(&wait, current);
1263                         add_wait_queue(&runtime->sleep, &wait);
1264                         set_current_state(TASK_INTERRUPTIBLE);
1265                         spin_unlock_irq(&runtime->lock);
1266                         timeout = schedule_timeout(30 * HZ);
1267                         remove_wait_queue(&runtime->sleep, &wait);
1268                         if (signal_pending(current))
1269                                 return result > 0 ? result : -ERESTARTSYS;
1270                         if (runtime->avail == last_avail && !timeout)
1271                                 return result > 0 ? result : -EIO;
1272                         spin_lock_irq(&runtime->lock);
1273                 }
1274                 spin_unlock_irq(&runtime->lock);
1275         }
1276         return result;
1277 }
1278
1279 static unsigned int snd_rawmidi_poll(struct file *file, poll_table * wait)
1280 {
1281         struct snd_rawmidi_file *rfile;
1282         struct snd_rawmidi_runtime *runtime;
1283         unsigned int mask;
1284
1285         rfile = file->private_data;
1286         if (rfile->input != NULL) {
1287                 runtime = rfile->input->runtime;
1288                 snd_rawmidi_input_trigger(rfile->input, 1);
1289                 poll_wait(file, &runtime->sleep, wait);
1290         }
1291         if (rfile->output != NULL) {
1292                 runtime = rfile->output->runtime;
1293                 poll_wait(file, &runtime->sleep, wait);
1294         }
1295         mask = 0;
1296         if (rfile->input != NULL) {
1297                 if (snd_rawmidi_ready(rfile->input))
1298                         mask |= POLLIN | POLLRDNORM;
1299         }
1300         if (rfile->output != NULL) {
1301                 if (snd_rawmidi_ready(rfile->output))
1302                         mask |= POLLOUT | POLLWRNORM;
1303         }
1304         return mask;
1305 }
1306
1307 /*
1308  */
1309 #ifdef CONFIG_COMPAT
1310 #include "rawmidi_compat.c"
1311 #else
1312 #define snd_rawmidi_ioctl_compat        NULL
1313 #endif
1314
1315 /*
1316
1317  */
1318
1319 static void snd_rawmidi_proc_info_read(struct snd_info_entry *entry,
1320                                        struct snd_info_buffer *buffer)
1321 {
1322         struct snd_rawmidi *rmidi;
1323         struct snd_rawmidi_substream *substream;
1324         struct snd_rawmidi_runtime *runtime;
1325
1326         rmidi = entry->private_data;
1327         snd_iprintf(buffer, "%s\n\n", rmidi->name);
1328         mutex_lock(&rmidi->open_mutex);
1329         if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_OUTPUT) {
1330                 list_for_each_entry(substream,
1331                                     &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams,
1332                                     list) {
1333                         snd_iprintf(buffer,
1334                                     "Output %d\n"
1335                                     "  Tx bytes     : %lu\n",
1336                                     substream->number,
1337                                     (unsigned long) substream->bytes);
1338                         if (substream->opened) {
1339                                 snd_iprintf(buffer,
1340                                     "  Owner PID    : %d\n",
1341                                     pid_vnr(substream->pid));
1342                                 runtime = substream->runtime;
1343                                 snd_iprintf(buffer,
1344                                     "  Mode         : %s\n"
1345                                     "  Buffer size  : %lu\n"
1346                                     "  Avail        : %lu\n",
1347                                     runtime->oss ? "OSS compatible" : "native",
1348                                     (unsigned long) runtime->buffer_size,
1349                                     (unsigned long) runtime->avail);
1350                         }
1351                 }
1352         }
1353         if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_INPUT) {
1354                 list_for_each_entry(substream,
1355                                     &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams,
1356                                     list) {
1357                         snd_iprintf(buffer,
1358                                     "Input %d\n"
1359                                     "  Rx bytes     : %lu\n",
1360                                     substream->number,
1361                                     (unsigned long) substream->bytes);
1362                         if (substream->opened) {
1363                                 snd_iprintf(buffer,
1364                                             "  Owner PID    : %d\n",
1365                                             pid_vnr(substream->pid));
1366                                 runtime = substream->runtime;
1367                                 snd_iprintf(buffer,
1368                                             "  Buffer size  : %lu\n"
1369                                             "  Avail        : %lu\n"
1370                                             "  Overruns     : %lu\n",
1371                                             (unsigned long) runtime->buffer_size,
1372                                             (unsigned long) runtime->avail,
1373                                             (unsigned long) runtime->xruns);
1374                         }
1375                 }
1376         }
1377         mutex_unlock(&rmidi->open_mutex);
1378 }
1379
1380 /*
1381  *  Register functions
1382  */
1383
1384 static const struct file_operations snd_rawmidi_f_ops =
1385 {
1386         .owner =        THIS_MODULE,
1387         .read =         snd_rawmidi_read,
1388         .write =        snd_rawmidi_write,
1389         .open =         snd_rawmidi_open,
1390         .release =      snd_rawmidi_release,
1391         .llseek =       no_llseek,
1392         .poll =         snd_rawmidi_poll,
1393         .unlocked_ioctl =       snd_rawmidi_ioctl,
1394         .compat_ioctl = snd_rawmidi_ioctl_compat,
1395 };
1396
1397 static int snd_rawmidi_alloc_substreams(struct snd_rawmidi *rmidi,
1398                                         struct snd_rawmidi_str *stream,
1399                                         int direction,
1400                                         int count)
1401 {
1402         struct snd_rawmidi_substream *substream;
1403         int idx;
1404
1405         for (idx = 0; idx < count; idx++) {
1406                 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
1407                 if (substream == NULL) {
1408                         snd_printk(KERN_ERR "rawmidi: cannot allocate substream\n");
1409                         return -ENOMEM;
1410                 }
1411                 substream->stream = direction;
1412                 substream->number = idx;
1413                 substream->rmidi = rmidi;
1414                 substream->pstr = stream;
1415                 list_add_tail(&substream->list, &stream->substreams);
1416                 stream->substream_count++;
1417         }
1418         return 0;
1419 }
1420
1421 /**
1422  * snd_rawmidi_new - create a rawmidi instance
1423  * @card: the card instance
1424  * @id: the id string
1425  * @device: the device index
1426  * @output_count: the number of output streams
1427  * @input_count: the number of input streams
1428  * @rrawmidi: the pointer to store the new rawmidi instance
1429  *
1430  * Creates a new rawmidi instance.
1431  * Use snd_rawmidi_set_ops() to set the operators to the new instance.
1432  *
1433  * Returns zero if successful, or a negative error code on failure.
1434  */
1435 int snd_rawmidi_new(struct snd_card *card, char *id, int device,
1436                     int output_count, int input_count,
1437                     struct snd_rawmidi ** rrawmidi)
1438 {
1439         struct snd_rawmidi *rmidi;
1440         int err;
1441         static struct snd_device_ops ops = {
1442                 .dev_free = snd_rawmidi_dev_free,
1443                 .dev_register = snd_rawmidi_dev_register,
1444                 .dev_disconnect = snd_rawmidi_dev_disconnect,
1445         };
1446
1447         if (snd_BUG_ON(!card))
1448                 return -ENXIO;
1449         if (rrawmidi)
1450                 *rrawmidi = NULL;
1451         rmidi = kzalloc(sizeof(*rmidi), GFP_KERNEL);
1452         if (rmidi == NULL) {
1453                 snd_printk(KERN_ERR "rawmidi: cannot allocate\n");
1454                 return -ENOMEM;
1455         }
1456         rmidi->card = card;
1457         rmidi->device = device;
1458         mutex_init(&rmidi->open_mutex);
1459         init_waitqueue_head(&rmidi->open_wait);
1460         INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams);
1461         INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams);
1462
1463         if (id != NULL)
1464                 strlcpy(rmidi->id, id, sizeof(rmidi->id));
1465         if ((err = snd_rawmidi_alloc_substreams(rmidi,
1466                                                 &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT],
1467                                                 SNDRV_RAWMIDI_STREAM_INPUT,
1468                                                 input_count)) < 0) {
1469                 snd_rawmidi_free(rmidi);
1470                 return err;
1471         }
1472         if ((err = snd_rawmidi_alloc_substreams(rmidi,
1473                                                 &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT],
1474                                                 SNDRV_RAWMIDI_STREAM_OUTPUT,
1475                                                 output_count)) < 0) {
1476                 snd_rawmidi_free(rmidi);
1477                 return err;
1478         }
1479         if ((err = snd_device_new(card, SNDRV_DEV_RAWMIDI, rmidi, &ops)) < 0) {
1480                 snd_rawmidi_free(rmidi);
1481                 return err;
1482         }
1483         if (rrawmidi)
1484                 *rrawmidi = rmidi;
1485         return 0;
1486 }
1487
1488 static void snd_rawmidi_free_substreams(struct snd_rawmidi_str *stream)
1489 {
1490         struct snd_rawmidi_substream *substream;
1491
1492         while (!list_empty(&stream->substreams)) {
1493                 substream = list_entry(stream->substreams.next, struct snd_rawmidi_substream, list);
1494                 list_del(&substream->list);
1495                 kfree(substream);
1496         }
1497 }
1498
1499 static int snd_rawmidi_free(struct snd_rawmidi *rmidi)
1500 {
1501         if (!rmidi)
1502                 return 0;
1503
1504         snd_info_free_entry(rmidi->proc_entry);
1505         rmidi->proc_entry = NULL;
1506         mutex_lock(&register_mutex);
1507         if (rmidi->ops && rmidi->ops->dev_unregister)
1508                 rmidi->ops->dev_unregister(rmidi);
1509         mutex_unlock(&register_mutex);
1510
1511         snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT]);
1512         snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT]);
1513         if (rmidi->private_free)
1514                 rmidi->private_free(rmidi);
1515         kfree(rmidi);
1516         return 0;
1517 }
1518
1519 static int snd_rawmidi_dev_free(struct snd_device *device)
1520 {
1521         struct snd_rawmidi *rmidi = device->device_data;
1522         return snd_rawmidi_free(rmidi);
1523 }
1524
1525 #if defined(CONFIG_SND_SEQUENCER) || (defined(MODULE) && defined(CONFIG_SND_SEQUENCER_MODULE))
1526 static void snd_rawmidi_dev_seq_free(struct snd_seq_device *device)
1527 {
1528         struct snd_rawmidi *rmidi = device->private_data;
1529         rmidi->seq_dev = NULL;
1530 }
1531 #endif
1532
1533 static int snd_rawmidi_dev_register(struct snd_device *device)
1534 {
1535         int err;
1536         struct snd_info_entry *entry;
1537         char name[16];
1538         struct snd_rawmidi *rmidi = device->device_data;
1539
1540         if (rmidi->device >= SNDRV_RAWMIDI_DEVICES)
1541                 return -ENOMEM;
1542         mutex_lock(&register_mutex);
1543         if (snd_rawmidi_search(rmidi->card, rmidi->device)) {
1544                 mutex_unlock(&register_mutex);
1545                 return -EBUSY;
1546         }
1547         list_add_tail(&rmidi->list, &snd_rawmidi_devices);
1548         sprintf(name, "midiC%iD%i", rmidi->card->number, rmidi->device);
1549         if ((err = snd_register_device(SNDRV_DEVICE_TYPE_RAWMIDI,
1550                                        rmidi->card, rmidi->device,
1551                                        &snd_rawmidi_f_ops, rmidi, name)) < 0) {
1552                 snd_printk(KERN_ERR "unable to register rawmidi device %i:%i\n", rmidi->card->number, rmidi->device);
1553                 list_del(&rmidi->list);
1554                 mutex_unlock(&register_mutex);
1555                 return err;
1556         }
1557         if (rmidi->ops && rmidi->ops->dev_register &&
1558             (err = rmidi->ops->dev_register(rmidi)) < 0) {
1559                 snd_unregister_device(SNDRV_DEVICE_TYPE_RAWMIDI, rmidi->card, rmidi->device);
1560                 list_del(&rmidi->list);
1561                 mutex_unlock(&register_mutex);
1562                 return err;
1563         }
1564 #ifdef CONFIG_SND_OSSEMUL
1565         rmidi->ossreg = 0;
1566         if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1567                 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1568                                             rmidi->card, 0, &snd_rawmidi_f_ops,
1569                                             rmidi, name) < 0) {
1570                         snd_printk(KERN_ERR "unable to register OSS rawmidi device %i:%i\n", rmidi->card->number, 0);
1571                 } else {
1572                         rmidi->ossreg++;
1573 #ifdef SNDRV_OSS_INFO_DEV_MIDI
1574                         snd_oss_info_register(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number, rmidi->name);
1575 #endif
1576                 }
1577         }
1578         if ((int)rmidi->device == amidi_map[rmidi->card->number]) {
1579                 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1580                                             rmidi->card, 1, &snd_rawmidi_f_ops,
1581                                             rmidi, name) < 0) {
1582                         snd_printk(KERN_ERR "unable to register OSS rawmidi device %i:%i\n", rmidi->card->number, 1);
1583                 } else {
1584                         rmidi->ossreg++;
1585                 }
1586         }
1587 #endif /* CONFIG_SND_OSSEMUL */
1588         mutex_unlock(&register_mutex);
1589         sprintf(name, "midi%d", rmidi->device);
1590         entry = snd_info_create_card_entry(rmidi->card, name, rmidi->card->proc_root);
1591         if (entry) {
1592                 entry->private_data = rmidi;
1593                 entry->c.text.read = snd_rawmidi_proc_info_read;
1594                 if (snd_info_register(entry) < 0) {
1595                         snd_info_free_entry(entry);
1596                         entry = NULL;
1597                 }
1598         }
1599         rmidi->proc_entry = entry;
1600 #if defined(CONFIG_SND_SEQUENCER) || (defined(MODULE) && defined(CONFIG_SND_SEQUENCER_MODULE))
1601         if (!rmidi->ops || !rmidi->ops->dev_register) { /* own registration mechanism */
1602                 if (snd_seq_device_new(rmidi->card, rmidi->device, SNDRV_SEQ_DEV_ID_MIDISYNTH, 0, &rmidi->seq_dev) >= 0) {
1603                         rmidi->seq_dev->private_data = rmidi;
1604                         rmidi->seq_dev->private_free = snd_rawmidi_dev_seq_free;
1605                         sprintf(rmidi->seq_dev->name, "MIDI %d-%d", rmidi->card->number, rmidi->device);
1606                         snd_device_register(rmidi->card, rmidi->seq_dev);
1607                 }
1608         }
1609 #endif
1610         return 0;
1611 }
1612
1613 static int snd_rawmidi_dev_disconnect(struct snd_device *device)
1614 {
1615         struct snd_rawmidi *rmidi = device->device_data;
1616
1617         mutex_lock(&register_mutex);
1618         list_del_init(&rmidi->list);
1619 #ifdef CONFIG_SND_OSSEMUL
1620         if (rmidi->ossreg) {
1621                 if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1622                         snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 0);
1623 #ifdef SNDRV_OSS_INFO_DEV_MIDI
1624                         snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number);
1625 #endif
1626                 }
1627                 if ((int)rmidi->device == amidi_map[rmidi->card->number])
1628                         snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 1);
1629                 rmidi->ossreg = 0;
1630         }
1631 #endif /* CONFIG_SND_OSSEMUL */
1632         snd_unregister_device(SNDRV_DEVICE_TYPE_RAWMIDI, rmidi->card, rmidi->device);
1633         mutex_unlock(&register_mutex);
1634         return 0;
1635 }
1636
1637 /**
1638  * snd_rawmidi_set_ops - set the rawmidi operators
1639  * @rmidi: the rawmidi instance
1640  * @stream: the stream direction, SNDRV_RAWMIDI_STREAM_XXX
1641  * @ops: the operator table
1642  *
1643  * Sets the rawmidi operators for the given stream direction.
1644  */
1645 void snd_rawmidi_set_ops(struct snd_rawmidi *rmidi, int stream,
1646                          struct snd_rawmidi_ops *ops)
1647 {
1648         struct snd_rawmidi_substream *substream;
1649
1650         list_for_each_entry(substream, &rmidi->streams[stream].substreams, list)
1651                 substream->ops = ops;
1652 }
1653
1654 /*
1655  *  ENTRY functions
1656  */
1657
1658 static int __init alsa_rawmidi_init(void)
1659 {
1660
1661         snd_ctl_register_ioctl(snd_rawmidi_control_ioctl);
1662         snd_ctl_register_ioctl_compat(snd_rawmidi_control_ioctl);
1663 #ifdef CONFIG_SND_OSSEMUL
1664         { int i;
1665         /* check device map table */
1666         for (i = 0; i < SNDRV_CARDS; i++) {
1667                 if (midi_map[i] < 0 || midi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1668                         snd_printk(KERN_ERR "invalid midi_map[%d] = %d\n", i, midi_map[i]);
1669                         midi_map[i] = 0;
1670                 }
1671                 if (amidi_map[i] < 0 || amidi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1672                         snd_printk(KERN_ERR "invalid amidi_map[%d] = %d\n", i, amidi_map[i]);
1673                         amidi_map[i] = 1;
1674                 }
1675         }
1676         }
1677 #endif /* CONFIG_SND_OSSEMUL */
1678         return 0;
1679 }
1680
1681 static void __exit alsa_rawmidi_exit(void)
1682 {
1683         snd_ctl_unregister_ioctl(snd_rawmidi_control_ioctl);
1684         snd_ctl_unregister_ioctl_compat(snd_rawmidi_control_ioctl);
1685 }
1686
1687 module_init(alsa_rawmidi_init)
1688 module_exit(alsa_rawmidi_exit)
1689
1690 EXPORT_SYMBOL(snd_rawmidi_output_params);
1691 EXPORT_SYMBOL(snd_rawmidi_input_params);
1692 EXPORT_SYMBOL(snd_rawmidi_drop_output);
1693 EXPORT_SYMBOL(snd_rawmidi_drain_output);
1694 EXPORT_SYMBOL(snd_rawmidi_drain_input);
1695 EXPORT_SYMBOL(snd_rawmidi_receive);
1696 EXPORT_SYMBOL(snd_rawmidi_transmit_empty);
1697 EXPORT_SYMBOL(snd_rawmidi_transmit_peek);
1698 EXPORT_SYMBOL(snd_rawmidi_transmit_ack);
1699 EXPORT_SYMBOL(snd_rawmidi_transmit);
1700 EXPORT_SYMBOL(snd_rawmidi_new);
1701 EXPORT_SYMBOL(snd_rawmidi_set_ops);
1702 EXPORT_SYMBOL(snd_rawmidi_info_select);
1703 EXPORT_SYMBOL(snd_rawmidi_kernel_open);
1704 EXPORT_SYMBOL(snd_rawmidi_kernel_release);
1705 EXPORT_SYMBOL(snd_rawmidi_kernel_read);
1706 EXPORT_SYMBOL(snd_rawmidi_kernel_write);