sound/core/rawmidi.c

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