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                 if (device >= SNDRV_RAWMIDI_DEVICES) /* next device is -1 */
 833                         device = SNDRV_RAWMIDI_DEVICES - 1;
 834                 mutex_lock(&register_mutex);
 835                 device = device < 0 ? 0 : device + 1;
 836                 while (device < SNDRV_RAWMIDI_DEVICES) {
 837                         if (snd_rawmidi_search(card, device))
 838                                 break;
 839                         device++;
 840                 }
 841                 if (device == SNDRV_RAWMIDI_DEVICES)
 842                         device = -1;
 843                 mutex_unlock(&register_mutex);
 844                 if (put_user(device, (int __user *)argp))
 845                         return -EFAULT;
 846                 return 0;
 847         }
 848         case SNDRV_CTL_IOCTL_RAWMIDI_PREFER_SUBDEVICE:
 849         {
 850                 int val;
 851
 852                 if (get_user(val, (int __user *)argp))
 853                         return -EFAULT;
 854                 control->prefer_rawmidi_subdevice = val;
 855                 return 0;
 856         }
 857         case SNDRV_CTL_IOCTL_RAWMIDI_INFO:
 858                 return snd_rawmidi_info_select_user(card, argp);
 859         }
 860         return -ENOIOCTLCMD;
 861 }
 862
 863 /**
 864  * snd_rawmidi_receive - receive the input data from the device
 865  * @substream: the rawmidi substream
 866  * @buffer: the buffer pointer
 867  * @count: the data size to read
 868  *
 869  * Reads the data from the internal buffer.
 870  *
 871  * Returns the size of read data, or a negative error code on failure.
 872  */
 873 int snd_rawmidi_receive(struct snd_rawmidi_substream *substream,
 874                         const unsigned char *buffer, int count)
 875 {
 876         unsigned long flags;
 877         int result = 0, count1;
 878         struct snd_rawmidi_runtime *runtime = substream->runtime;
 879
 880         if (!substream->opened)
 881                 return -EBADFD;
 882         if (runtime->buffer == NULL) {
 883                 snd_printd("snd_rawmidi_receive: input is not active!!!\n");
 884                 return -EINVAL;
 885         }
 886         spin_lock_irqsave(&runtime->lock, flags);
 887         if (count == 1) {       /* special case, faster code */
 888                 substream->bytes++;
 889                 if (runtime->avail < runtime->buffer_size) {
 890                         runtime->buffer[runtime->hw_ptr++] = buffer[0];
 891                         runtime->hw_ptr %= runtime->buffer_size;
 892                         runtime->avail++;
 893                         result++;
 894                 } else {
 895                         runtime->xruns++;
 896                 }
 897         } else {
 898                 substream->bytes += count;
 899                 count1 = runtime->buffer_size - runtime->hw_ptr;
 900                 if (count1 > count)
 901                         count1 = count;
 902                 if (count1 > (int)(runtime->buffer_size - runtime->avail))
 903                         count1 = runtime->buffer_size - runtime->avail;
 904                 memcpy(runtime->buffer + runtime->hw_ptr, buffer, count1);
 905                 runtime->hw_ptr += count1;
 906                 runtime->hw_ptr %= runtime->buffer_size;
 907                 runtime->avail += count1;
 908                 count -= count1;
 909                 result += count1;
 910                 if (count > 0) {
 911                         buffer += count1;
 912                         count1 = count;
 913                         if (count1 > (int)(runtime->buffer_size - runtime->avail)) {
 914                                 count1 = runtime->buffer_size - runtime->avail;
 915                                 runtime->xruns += count - count1;
 916                         }
 917                         if (count1 > 0) {
 918                                 memcpy(runtime->buffer, buffer, count1);
 919                                 runtime->hw_ptr = count1;
 920                                 runtime->avail += count1;
 921                                 result += count1;
 922                         }
 923                 }
 924         }
 925         if (result > 0) {
 926                 if (runtime->event)
 927                         tasklet_schedule(&runtime->tasklet);
 928                 else if (snd_rawmidi_ready(substream))
 929                         wake_up(&runtime->sleep);
 930         }
 931         spin_unlock_irqrestore(&runtime->lock, flags);
 932         return result;
 933 }
 934
 935 static long snd_rawmidi_kernel_read1(struct snd_rawmidi_substream *substream,
 936                                      unsigned char __user *userbuf,
 937                                      unsigned char *kernelbuf, long count)
 938 {
 939         unsigned long flags;
 940         long result = 0, count1;
 941         struct snd_rawmidi_runtime *runtime = substream->runtime;
 942
 943         while (count > 0 && runtime->avail) {
 944                 count1 = runtime->buffer_size - runtime->appl_ptr;
 945                 if (count1 > count)
 946                         count1 = count;
 947                 spin_lock_irqsave(&runtime->lock, flags);
 948                 if (count1 > (int)runtime->avail)
 949                         count1 = runtime->avail;
 950                 if (kernelbuf)
 951                         memcpy(kernelbuf + result, runtime->buffer + runtime->appl_ptr, count1);
 952                 if (userbuf) {
 953                         spin_unlock_irqrestore(&runtime->lock, flags);
 954                         if (copy_to_user(userbuf + result,
 955                                          runtime->buffer + runtime->appl_ptr, count1)) {
 956                                 return result > 0 ? result : -EFAULT;
 957                         }
 958                         spin_lock_irqsave(&runtime->lock, flags);
 959                 }
 960                 runtime->appl_ptr += count1;
 961                 runtime->appl_ptr %= runtime->buffer_size;
 962                 runtime->avail -= count1;
 963                 spin_unlock_irqrestore(&runtime->lock, flags);
 964                 result += count1;
 965                 count -= count1;
 966         }
 967         return result;
 968 }
 969
 970 long snd_rawmidi_kernel_read(struct snd_rawmidi_substream *substream,
 971                              unsigned char *buf, long count)
 972 {
 973         snd_rawmidi_input_trigger(substream, 1);
 974         return snd_rawmidi_kernel_read1(substream, NULL/*userbuf*/, buf, count);
 975 }
 976
 977 static ssize_t snd_rawmidi_read(struct file *file, char __user *buf, size_t count,
 978                                 loff_t *offset)
 979 {
 980         long result;
 981         int count1;
 982         struct snd_rawmidi_file *rfile;
 983         struct snd_rawmidi_substream *substream;
 984         struct snd_rawmidi_runtime *runtime;
 985
 986         rfile = file->private_data;
 987         substream = rfile->input;
 988         if (substream == NULL)
 989                 return -EIO;
 990         runtime = substream->runtime;
 991         snd_rawmidi_input_trigger(substream, 1);
 992         result = 0;
 993         while (count > 0) {
 994                 spin_lock_irq(&runtime->lock);
 995                 while (!snd_rawmidi_ready(substream)) {
 996                         wait_queue_t wait;
 997                         if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
 998                                 spin_unlock_irq(&runtime->lock);
 999                                 return result > 0 ? result : -EAGAIN;
1000                         }
1001                         init_waitqueue_entry(&wait, current);
1002                         add_wait_queue(&runtime->sleep, &wait);
1003                         set_current_state(TASK_INTERRUPTIBLE);
1004                         spin_unlock_irq(&runtime->lock);
1005                         schedule();
1006                         remove_wait_queue(&runtime->sleep, &wait);
1007                         if (signal_pending(current))
1008                                 return result > 0 ? result : -ERESTARTSYS;
1009                         if (!runtime->avail)
1010                                 return result > 0 ? result : -EIO;
1011                         spin_lock_irq(&runtime->lock);
1012                 }
1013                 spin_unlock_irq(&runtime->lock);
1014                 count1 = snd_rawmidi_kernel_read1(substream,
1015                                                   (unsigned char __user *)buf,
1016                                                   NULL/*kernelbuf*/,
1017                                                   count);
1018                 if (count1 < 0)
1019                         return result > 0 ? result : count1;
1020                 result += count1;
1021                 buf += count1;
1022                 count -= count1;
1023         }
1024         return result;
1025 }
1026
1027 /**
1028  * snd_rawmidi_transmit_empty - check whether the output buffer is empty
1029  * @substream: the rawmidi substream
1030  *
1031  * Returns 1 if the internal output buffer is empty, 0 if not.
1032  */
1033 int snd_rawmidi_transmit_empty(struct snd_rawmidi_substream *substream)
1034 {
1035         struct snd_rawmidi_runtime *runtime = substream->runtime;
1036         int result;
1037         unsigned long flags;
1038
1039         if (runtime->buffer == NULL) {
1040                 snd_printd("snd_rawmidi_transmit_empty: output is not active!!!\n");
1041                 return 1;
1042         }
1043         spin_lock_irqsave(&runtime->lock, flags);
1044         result = runtime->avail >= runtime->buffer_size;
1045         spin_unlock_irqrestore(&runtime->lock, flags);
1046         return result;
1047 }
1048
1049 /**
1050  * snd_rawmidi_transmit_peek - copy data from the internal buffer
1051  * @substream: the rawmidi substream
1052  * @buffer: the buffer pointer
1053  * @count: data size to transfer
1054  *
1055  * Copies data from the internal output buffer to the given buffer.
1056  *
1057  * Call this in the interrupt handler when the midi output is ready,
1058  * and call snd_rawmidi_transmit_ack() after the transmission is
1059  * finished.
1060  *
1061  * Returns the size of copied data, or a negative error code on failure.
1062  */
1063 int snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
1064                               unsigned char *buffer, int count)
1065 {
1066         unsigned long flags;
1067         int result, count1;
1068         struct snd_rawmidi_runtime *runtime = substream->runtime;
1069
1070         if (runtime->buffer == NULL) {
1071                 snd_printd("snd_rawmidi_transmit_peek: output is not active!!!\n");
1072                 return -EINVAL;
1073         }
1074         result = 0;
1075         spin_lock_irqsave(&runtime->lock, flags);
1076         if (runtime->avail >= runtime->buffer_size) {
1077                 /* warning: lowlevel layer MUST trigger down the hardware */
1078                 goto __skip;
1079         }
1080         if (count == 1) {       /* special case, faster code */
1081                 *buffer = runtime->buffer[runtime->hw_ptr];
1082                 result++;
1083         } else {
1084                 count1 = runtime->buffer_size - runtime->hw_ptr;
1085                 if (count1 > count)
1086                         count1 = count;
1087                 if (count1 > (int)(runtime->buffer_size - runtime->avail))
1088                         count1 = runtime->buffer_size - runtime->avail;
1089                 memcpy(buffer, runtime->buffer + runtime->hw_ptr, count1);
1090                 count -= count1;
1091                 result += count1;
1092                 if (count > 0) {
1093                         if (count > (int)(runtime->buffer_size - runtime->avail - count1))
1094                                 count = runtime->buffer_size - runtime->avail - count1;
1095                         memcpy(buffer + count1, runtime->buffer, count);
1096                         result += count;
1097                 }
1098         }
1099       __skip:
1100         spin_unlock_irqrestore(&runtime->lock, flags);
1101         return result;
1102 }
1103
1104 /**
1105  * snd_rawmidi_transmit_ack - acknowledge the transmission
1106  * @substream: the rawmidi substream
1107  * @count: the tranferred count
1108  *
1109  * Advances the hardware pointer for the internal output buffer with
1110  * the given size and updates the condition.
1111  * Call after the transmission is finished.
1112  *
1113  * Returns the advanced size if successful, or a negative error code on failure.
1114  */
1115 int snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count)
1116 {
1117         unsigned long flags;
1118         struct snd_rawmidi_runtime *runtime = substream->runtime;
1119
1120         if (runtime->buffer == NULL) {
1121                 snd_printd("snd_rawmidi_transmit_ack: output is not active!!!\n");
1122                 return -EINVAL;
1123         }
1124         spin_lock_irqsave(&runtime->lock, flags);
1125         snd_BUG_ON(runtime->avail + count > runtime->buffer_size);
1126         runtime->hw_ptr += count;
1127         runtime->hw_ptr %= runtime->buffer_size;
1128         runtime->avail += count;
1129         substream->bytes += count;
1130         if (count > 0) {
1131                 if (runtime->drain || snd_rawmidi_ready(substream))
1132                         wake_up(&runtime->sleep);
1133         }
1134         spin_unlock_irqrestore(&runtime->lock, flags);
1135         return count;
1136 }
1137
1138 /**
1139  * snd_rawmidi_transmit - copy from the buffer to the device
1140  * @substream: the rawmidi substream
1141  * @buffer: the buffer pointer
1142  * @count: the data size to transfer
1143  *
1144  * Copies data from the buffer to the device and advances the pointer.
1145  *
1146  * Returns the copied size if successful, or a negative error code on failure.
1147  */
1148 int snd_rawmidi_transmit(struct snd_rawmidi_substream *substream,
1149                          unsigned char *buffer, int count)
1150 {
1151         if (!substream->opened)
1152                 return -EBADFD;
1153         count = snd_rawmidi_transmit_peek(substream, buffer, count);
1154         if (count < 0)
1155                 return count;
1156         return snd_rawmidi_transmit_ack(substream, count);
1157 }
1158
1159 static long snd_rawmidi_kernel_write1(struct snd_rawmidi_substream *substream,
1160                                       const unsigned char __user *userbuf,
1161                                       const unsigned char *kernelbuf,
1162                                       long count)
1163 {
1164         unsigned long flags;
1165         long count1, result;
1166         struct snd_rawmidi_runtime *runtime = substream->runtime;
1167
1168         if (snd_BUG_ON(!kernelbuf && !userbuf))
1169                 return -EINVAL;
1170         if (snd_BUG_ON(!runtime->buffer))
1171                 return -EINVAL;
1172
1173         result = 0;
1174         spin_lock_irqsave(&runtime->lock, flags);
1175         if (substream->append) {
1176                 if ((long)runtime->avail < count) {
1177                         spin_unlock_irqrestore(&runtime->lock, flags);
1178                         return -EAGAIN;
1179                 }
1180         }
1181         while (count > 0 && runtime->avail > 0) {
1182                 count1 = runtime->buffer_size - runtime->appl_ptr;
1183                 if (count1 > count)
1184                         count1 = count;
1185                 if (count1 > (long)runtime->avail)
1186                         count1 = runtime->avail;
1187                 if (kernelbuf)
1188                         memcpy(runtime->buffer + runtime->appl_ptr,
1189                                kernelbuf + result, count1);
1190                 else if (userbuf) {
1191                         spin_unlock_irqrestore(&runtime->lock, flags);
1192                         if (copy_from_user(runtime->buffer + runtime->appl_ptr,
1193                                            userbuf + result, count1)) {
1194                                 spin_lock_irqsave(&runtime->lock, flags);
1195                                 result = result > 0 ? result : -EFAULT;
1196                                 goto __end;
1197                         }
1198                         spin_lock_irqsave(&runtime->lock, flags);
1199                 }
1200                 runtime->appl_ptr += count1;
1201                 runtime->appl_ptr %= runtime->buffer_size;
1202                 runtime->avail -= count1;
1203                 result += count1;
1204                 count -= count1;
1205         }
1206       __end:
1207         count1 = runtime->avail < runtime->buffer_size;
1208         spin_unlock_irqrestore(&runtime->lock, flags);
1209         if (count1)
1210                 snd_rawmidi_output_trigger(substream, 1);
1211         return result;
1212 }
1213
1214 long snd_rawmidi_kernel_write(struct snd_rawmidi_substream *substream,
1215                               const unsigned char *buf, long count)
1216 {
1217         return snd_rawmidi_kernel_write1(substream, NULL, buf, count);
1218 }
1219
1220 static ssize_t snd_rawmidi_write(struct file *file, const char __user *buf,
1221                                  size_t count, loff_t *offset)
1222 {
1223         long result, timeout;
1224         int count1;
1225         struct snd_rawmidi_file *rfile;
1226         struct snd_rawmidi_runtime *runtime;
1227         struct snd_rawmidi_substream *substream;
1228
1229         rfile = file->private_data;
1230         substream = rfile->output;
1231         runtime = substream->runtime;
1232         /* we cannot put an atomic message to our buffer */
1233         if (substream->append && count > runtime->buffer_size)
1234                 return -EIO;
1235         result = 0;
1236         while (count > 0) {
1237                 spin_lock_irq(&runtime->lock);
1238                 while (!snd_rawmidi_ready_append(substream, count)) {
1239                         wait_queue_t wait;
1240                         if (file->f_flags & O_NONBLOCK) {
1241                                 spin_unlock_irq(&runtime->lock);
1242                                 return result > 0 ? result : -EAGAIN;
1243                         }
1244                         init_waitqueue_entry(&wait, current);
1245                         add_wait_queue(&runtime->sleep, &wait);
1246                         set_current_state(TASK_INTERRUPTIBLE);
1247                         spin_unlock_irq(&runtime->lock);
1248                         timeout = schedule_timeout(30 * HZ);
1249                         remove_wait_queue(&runtime->sleep, &wait);
1250                         if (signal_pending(current))
1251                                 return result > 0 ? result : -ERESTARTSYS;
1252                         if (!runtime->avail && !timeout)
1253                                 return result > 0 ? result : -EIO;
1254                         spin_lock_irq(&runtime->lock);
1255                 }
1256                 spin_unlock_irq(&runtime->lock);
1257                 count1 = snd_rawmidi_kernel_write1(substream, buf, NULL, count);
1258                 if (count1 < 0)
1259                         return result > 0 ? result : count1;
1260                 result += count1;
1261                 buf += count1;
1262                 if ((size_t)count1 < count && (file->f_flags & O_NONBLOCK))
1263                         break;
1264                 count -= count1;
1265         }
1266         if (file->f_flags & O_DSYNC) {
1267                 spin_lock_irq(&runtime->lock);
1268                 while (runtime->avail != runtime->buffer_size) {
1269                         wait_queue_t wait;
1270                         unsigned int last_avail = runtime->avail;
1271                         init_waitqueue_entry(&wait, current);
1272                         add_wait_queue(&runtime->sleep, &wait);
1273                         set_current_state(TASK_INTERRUPTIBLE);
1274                         spin_unlock_irq(&runtime->lock);
1275                         timeout = schedule_timeout(30 * HZ);
1276                         remove_wait_queue(&runtime->sleep, &wait);
1277                         if (signal_pending(current))
1278                                 return result > 0 ? result : -ERESTARTSYS;
1279                         if (runtime->avail == last_avail && !timeout)
1280                                 return result > 0 ? result : -EIO;
1281                         spin_lock_irq(&runtime->lock);
1282                 }
1283                 spin_unlock_irq(&runtime->lock);
1284         }
1285         return result;
1286 }
1287
1288 static unsigned int snd_rawmidi_poll(struct file *file, poll_table * wait)
1289 {
1290         struct snd_rawmidi_file *rfile;
1291         struct snd_rawmidi_runtime *runtime;
1292         unsigned int mask;
1293
1294         rfile = file->private_data;
1295         if (rfile->input != NULL) {
1296                 runtime = rfile->input->runtime;
1297                 snd_rawmidi_input_trigger(rfile->input, 1);
1298                 poll_wait(file, &runtime->sleep, wait);
1299         }
1300         if (rfile->output != NULL) {
1301                 runtime = rfile->output->runtime;
1302                 poll_wait(file, &runtime->sleep, wait);
1303         }
1304         mask = 0;
1305         if (rfile->input != NULL) {
1306                 if (snd_rawmidi_ready(rfile->input))
1307                         mask |= POLLIN | POLLRDNORM;
1308         }
1309         if (rfile->output != NULL) {
1310                 if (snd_rawmidi_ready(rfile->output))
1311                         mask |= POLLOUT | POLLWRNORM;
1312         }
1313         return mask;
1314 }
1315
1316 /*
1317  */
1318 #ifdef CONFIG_COMPAT
1319 #include "rawmidi_compat.c"
1320 #else
1321 #define snd_rawmidi_ioctl_compat        NULL
1322 #endif
1323
1324 /*
1325
1326  */
1327
1328 static void snd_rawmidi_proc_info_read(struct snd_info_entry *entry,
1329                                        struct snd_info_buffer *buffer)
1330 {
1331         struct snd_rawmidi *rmidi;
1332         struct snd_rawmidi_substream *substream;
1333         struct snd_rawmidi_runtime *runtime;
1334
1335         rmidi = entry->private_data;
1336         snd_iprintf(buffer, "%s\n\n", rmidi->name);
1337         mutex_lock(&rmidi->open_mutex);
1338         if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_OUTPUT) {
1339                 list_for_each_entry(substream,
1340                                     &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams,
1341                                     list) {
1342                         snd_iprintf(buffer,
1343                                     "Output %d\n"
1344                                     "  Tx bytes     : %lu\n",
1345                                     substream->number,
1346                                     (unsigned long) substream->bytes);
1347                         if (substream->opened) {
1348                                 snd_iprintf(buffer,
1349                                     "  Owner PID    : %d\n",
1350                                     pid_vnr(substream->pid));
1351                                 runtime = substream->runtime;
1352                                 snd_iprintf(buffer,
1353                                     "  Mode         : %s\n"
1354                                     "  Buffer size  : %lu\n"
1355                                     "  Avail        : %lu\n",
1356                                     runtime->oss ? "OSS compatible" : "native",
1357                                     (unsigned long) runtime->buffer_size,
1358                                     (unsigned long) runtime->avail);
1359                         }
1360                 }
1361         }
1362         if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_INPUT) {
1363                 list_for_each_entry(substream,
1364                                     &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams,
1365                                     list) {
1366                         snd_iprintf(buffer,
1367                                     "Input %d\n"
1368                                     "  Rx bytes     : %lu\n",
1369                                     substream->number,
1370                                     (unsigned long) substream->bytes);
1371                         if (substream->opened) {
1372                                 snd_iprintf(buffer,
1373                                             "  Owner PID    : %d\n",
1374                                             pid_vnr(substream->pid));
1375                                 runtime = substream->runtime;
1376                                 snd_iprintf(buffer,
1377                                             "  Buffer size  : %lu\n"
1378                                             "  Avail        : %lu\n"
1379                                             "  Overruns     : %lu\n",
1380                                             (unsigned long) runtime->buffer_size,
1381                                             (unsigned long) runtime->avail,
1382                                             (unsigned long) runtime->xruns);
1383                         }
1384                 }
1385         }
1386         mutex_unlock(&rmidi->open_mutex);
1387 }
1388
1389 /*
1390  *  Register functions
1391  */
1392
1393 static const struct file_operations snd_rawmidi_f_ops =
1394 {
1395         .owner =        THIS_MODULE,
1396         .read =         snd_rawmidi_read,
1397         .write =        snd_rawmidi_write,
1398         .open =         snd_rawmidi_open,
1399         .release =      snd_rawmidi_release,
1400         .llseek =       no_llseek,
1401         .poll =         snd_rawmidi_poll,
1402         .unlocked_ioctl =       snd_rawmidi_ioctl,
1403         .compat_ioctl = snd_rawmidi_ioctl_compat,
1404 };
1405
1406 static int snd_rawmidi_alloc_substreams(struct snd_rawmidi *rmidi,
1407                                         struct snd_rawmidi_str *stream,
1408                                         int direction,
1409                                         int count)
1410 {
1411         struct snd_rawmidi_substream *substream;
1412         int idx;
1413
1414         for (idx = 0; idx < count; idx++) {
1415                 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
1416                 if (substream == NULL) {
1417                         snd_printk(KERN_ERR "rawmidi: cannot allocate substream\n");
1418                         return -ENOMEM;
1419                 }
1420                 substream->stream = direction;
1421                 substream->number = idx;
1422                 substream->rmidi = rmidi;
1423                 substream->pstr = stream;
1424                 list_add_tail(&substream->list, &stream->substreams);
1425                 stream->substream_count++;
1426         }
1427         return 0;
1428 }
1429
1430 /**
1431  * snd_rawmidi_new - create a rawmidi instance
1432  * @card: the card instance
1433  * @id: the id string
1434  * @device: the device index
1435  * @output_count: the number of output streams
1436  * @input_count: the number of input streams
1437  * @rrawmidi: the pointer to store the new rawmidi instance
1438  *
1439  * Creates a new rawmidi instance.
1440  * Use snd_rawmidi_set_ops() to set the operators to the new instance.
1441  *
1442  * Returns zero if successful, or a negative error code on failure.
1443  */
1444 int snd_rawmidi_new(struct snd_card *card, char *id, int device,
1445                     int output_count, int input_count,
1446                     struct snd_rawmidi ** rrawmidi)
1447 {
1448         struct snd_rawmidi *rmidi;
1449         int err;
1450         static struct snd_device_ops ops = {
1451                 .dev_free = snd_rawmidi_dev_free,
1452                 .dev_register = snd_rawmidi_dev_register,
1453                 .dev_disconnect = snd_rawmidi_dev_disconnect,
1454         };
1455
1456         if (snd_BUG_ON(!card))
1457                 return -ENXIO;
1458         if (rrawmidi)
1459                 *rrawmidi = NULL;
1460         rmidi = kzalloc(sizeof(*rmidi), GFP_KERNEL);
1461         if (rmidi == NULL) {
1462                 snd_printk(KERN_ERR "rawmidi: cannot allocate\n");
1463                 return -ENOMEM;
1464         }
1465         rmidi->card = card;
1466         rmidi->device = device;
1467         mutex_init(&rmidi->open_mutex);
1468         init_waitqueue_head(&rmidi->open_wait);
1469         INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams);
1470         INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams);
1471
1472         if (id != NULL)
1473                 strlcpy(rmidi->id, id, sizeof(rmidi->id));
1474         if ((err = snd_rawmidi_alloc_substreams(rmidi,
1475                                                 &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT],
1476                                                 SNDRV_RAWMIDI_STREAM_INPUT,
1477                                                 input_count)) < 0) {
1478                 snd_rawmidi_free(rmidi);
1479                 return err;
1480         }
1481         if ((err = snd_rawmidi_alloc_substreams(rmidi,
1482                                                 &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT],
1483                                                 SNDRV_RAWMIDI_STREAM_OUTPUT,
1484                                                 output_count)) < 0) {
1485                 snd_rawmidi_free(rmidi);
1486                 return err;
1487         }
1488         if ((err = snd_device_new(card, SNDRV_DEV_RAWMIDI, rmidi, &ops)) < 0) {
1489                 snd_rawmidi_free(rmidi);
1490                 return err;
1491         }
1492         if (rrawmidi)
1493                 *rrawmidi = rmidi;
1494         return 0;
1495 }
1496
1497 static void snd_rawmidi_free_substreams(struct snd_rawmidi_str *stream)
1498 {
1499         struct snd_rawmidi_substream *substream;
1500
1501         while (!list_empty(&stream->substreams)) {
1502                 substream = list_entry(stream->substreams.next, struct snd_rawmidi_substream, list);
1503                 list_del(&substream->list);
1504                 kfree(substream);
1505         }
1506 }
1507
1508 static int snd_rawmidi_free(struct snd_rawmidi *rmidi)
1509 {
1510         if (!rmidi)
1511                 return 0;
1512
1513         snd_info_free_entry(rmidi->proc_entry);
1514         rmidi->proc_entry = NULL;
1515         mutex_lock(&register_mutex);
1516         if (rmidi->ops && rmidi->ops->dev_unregister)
1517                 rmidi->ops->dev_unregister(rmidi);
1518         mutex_unlock(&register_mutex);
1519
1520         snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT]);
1521         snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT]);
1522         if (rmidi->private_free)
1523                 rmidi->private_free(rmidi);
1524         kfree(rmidi);
1525         return 0;
1526 }
1527
1528 static int snd_rawmidi_dev_free(struct snd_device *device)
1529 {
1530         struct snd_rawmidi *rmidi = device->device_data;
1531         return snd_rawmidi_free(rmidi);
1532 }
1533
1534 #if defined(CONFIG_SND_SEQUENCER) || (defined(MODULE) && defined(CONFIG_SND_SEQUENCER_MODULE))
1535 static void snd_rawmidi_dev_seq_free(struct snd_seq_device *device)
1536 {
1537         struct snd_rawmidi *rmidi = device->private_data;
1538         rmidi->seq_dev = NULL;
1539 }
1540 #endif
1541
1542 static int snd_rawmidi_dev_register(struct snd_device *device)
1543 {
1544         int err;
1545         struct snd_info_entry *entry;
1546         char name[16];
1547         struct snd_rawmidi *rmidi = device->device_data;
1548
1549         if (rmidi->device >= SNDRV_RAWMIDI_DEVICES)
1550                 return -ENOMEM;
1551         mutex_lock(&register_mutex);
1552         if (snd_rawmidi_search(rmidi->card, rmidi->device)) {
1553                 mutex_unlock(&register_mutex);
1554                 return -EBUSY;
1555         }
1556         list_add_tail(&rmidi->list, &snd_rawmidi_devices);
1557         sprintf(name, "midiC%iD%i", rmidi->card->number, rmidi->device);
1558         if ((err = snd_register_device(SNDRV_DEVICE_TYPE_RAWMIDI,
1559                                        rmidi->card, rmidi->device,
1560                                        &snd_rawmidi_f_ops, rmidi, name)) < 0) {
1561                 snd_printk(KERN_ERR "unable to register rawmidi device %i:%i\n", rmidi->card->number, rmidi->device);
1562                 list_del(&rmidi->list);
1563                 mutex_unlock(&register_mutex);
1564                 return err;
1565         }
1566         if (rmidi->ops && rmidi->ops->dev_register &&
1567             (err = rmidi->ops->dev_register(rmidi)) < 0) {
1568                 snd_unregister_device(SNDRV_DEVICE_TYPE_RAWMIDI, rmidi->card, rmidi->device);
1569                 list_del(&rmidi->list);
1570                 mutex_unlock(&register_mutex);
1571                 return err;
1572         }
1573 #ifdef CONFIG_SND_OSSEMUL
1574         rmidi->ossreg = 0;
1575         if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1576                 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1577                                             rmidi->card, 0, &snd_rawmidi_f_ops,
1578                                             rmidi, name) < 0) {
1579                         snd_printk(KERN_ERR "unable to register OSS rawmidi device %i:%i\n", rmidi->card->number, 0);
1580                 } else {
1581                         rmidi->ossreg++;
1582 #ifdef SNDRV_OSS_INFO_DEV_MIDI
1583                         snd_oss_info_register(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number, rmidi->name);
1584 #endif
1585                 }
1586         }
1587         if ((int)rmidi->device == amidi_map[rmidi->card->number]) {
1588                 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1589                                             rmidi->card, 1, &snd_rawmidi_f_ops,
1590                                             rmidi, name) < 0) {
1591                         snd_printk(KERN_ERR "unable to register OSS rawmidi device %i:%i\n", rmidi->card->number, 1);
1592                 } else {
1593                         rmidi->ossreg++;
1594                 }
1595         }
1596 #endif /* CONFIG_SND_OSSEMUL */
1597         mutex_unlock(&register_mutex);
1598         sprintf(name, "midi%d", rmidi->device);
1599         entry = snd_info_create_card_entry(rmidi->card, name, rmidi->card->proc_root);
1600         if (entry) {
1601                 entry->private_data = rmidi;
1602                 entry->c.text.read = snd_rawmidi_proc_info_read;
1603                 if (snd_info_register(entry) < 0) {
1604                         snd_info_free_entry(entry);
1605                         entry = NULL;
1606                 }
1607         }
1608         rmidi->proc_entry = entry;
1609 #if defined(CONFIG_SND_SEQUENCER) || (defined(MODULE) && defined(CONFIG_SND_SEQUENCER_MODULE))
1610         if (!rmidi->ops || !rmidi->ops->dev_register) { /* own registration mechanism */
1611                 if (snd_seq_device_new(rmidi->card, rmidi->device, SNDRV_SEQ_DEV_ID_MIDISYNTH, 0, &rmidi->seq_dev) >= 0) {
1612                         rmidi->seq_dev->private_data = rmidi;
1613                         rmidi->seq_dev->private_free = snd_rawmidi_dev_seq_free;
1614                         sprintf(rmidi->seq_dev->name, "MIDI %d-%d", rmidi->card->number, rmidi->device);
1615                         snd_device_register(rmidi->card, rmidi->seq_dev);
1616                 }
1617         }
1618 #endif
1619         return 0;
1620 }
1621
1622 static int snd_rawmidi_dev_disconnect(struct snd_device *device)
1623 {
1624         struct snd_rawmidi *rmidi = device->device_data;
1625
1626         mutex_lock(&register_mutex);
1627         list_del_init(&rmidi->list);
1628 #ifdef CONFIG_SND_OSSEMUL
1629         if (rmidi->ossreg) {
1630                 if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1631                         snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 0);
1632 #ifdef SNDRV_OSS_INFO_DEV_MIDI
1633                         snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number);
1634 #endif
1635                 }
1636                 if ((int)rmidi->device == amidi_map[rmidi->card->number])
1637                         snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 1);
1638                 rmidi->ossreg = 0;
1639         }
1640 #endif /* CONFIG_SND_OSSEMUL */
1641         snd_unregister_device(SNDRV_DEVICE_TYPE_RAWMIDI, rmidi->card, rmidi->device);
1642         mutex_unlock(&register_mutex);
1643         return 0;
1644 }
1645
1646 /**
1647  * snd_rawmidi_set_ops - set the rawmidi operators
1648  * @rmidi: the rawmidi instance
1649  * @stream: the stream direction, SNDRV_RAWMIDI_STREAM_XXX
1650  * @ops: the operator table
1651  *
1652  * Sets the rawmidi operators for the given stream direction.
1653  */
1654 void snd_rawmidi_set_ops(struct snd_rawmidi *rmidi, int stream,
1655                          struct snd_rawmidi_ops *ops)
1656 {
1657         struct snd_rawmidi_substream *substream;
1658
1659         list_for_each_entry(substream, &rmidi->streams[stream].substreams, list)
1660                 substream->ops = ops;
1661 }
1662
1663 /*
1664  *  ENTRY functions
1665  */
1666
1667 static int __init alsa_rawmidi_init(void)
1668 {
1669
1670         snd_ctl_register_ioctl(snd_rawmidi_control_ioctl);
1671         snd_ctl_register_ioctl_compat(snd_rawmidi_control_ioctl);
1672 #ifdef CONFIG_SND_OSSEMUL
1673         { int i;
1674         /* check device map table */
1675         for (i = 0; i < SNDRV_CARDS; i++) {
1676                 if (midi_map[i] < 0 || midi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1677                         snd_printk(KERN_ERR "invalid midi_map[%d] = %d\n", i, midi_map[i]);
1678                         midi_map[i] = 0;
1679                 }
1680                 if (amidi_map[i] < 0 || amidi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1681                         snd_printk(KERN_ERR "invalid amidi_map[%d] = %d\n", i, amidi_map[i]);
1682                         amidi_map[i] = 1;
1683                 }
1684         }
1685         }
1686 #endif /* CONFIG_SND_OSSEMUL */
1687         return 0;
1688 }
1689
1690 static void __exit alsa_rawmidi_exit(void)
1691 {
1692         snd_ctl_unregister_ioctl(snd_rawmidi_control_ioctl);
1693         snd_ctl_unregister_ioctl_compat(snd_rawmidi_control_ioctl);
1694 }
1695
1696 module_init(alsa_rawmidi_init)
1697 module_exit(alsa_rawmidi_exit)
1698
1699 EXPORT_SYMBOL(snd_rawmidi_output_params);
1700 EXPORT_SYMBOL(snd_rawmidi_input_params);
1701 EXPORT_SYMBOL(snd_rawmidi_drop_output);
1702 EXPORT_SYMBOL(snd_rawmidi_drain_output);
1703 EXPORT_SYMBOL(snd_rawmidi_drain_input);
1704 EXPORT_SYMBOL(snd_rawmidi_receive);
1705 EXPORT_SYMBOL(snd_rawmidi_transmit_empty);
1706 EXPORT_SYMBOL(snd_rawmidi_transmit_peek);
1707 EXPORT_SYMBOL(snd_rawmidi_transmit_ack);
1708 EXPORT_SYMBOL(snd_rawmidi_transmit);
1709 EXPORT_SYMBOL(snd_rawmidi_new);
1710 EXPORT_SYMBOL(snd_rawmidi_set_ops);
1711 EXPORT_SYMBOL(snd_rawmidi_info_select);
1712 EXPORT_SYMBOL(snd_rawmidi_kernel_open);
1713 EXPORT_SYMBOL(snd_rawmidi_kernel_release);
1714 EXPORT_SYMBOL(snd_rawmidi_kernel_read);
1715 EXPORT_SYMBOL(snd_rawmidi_kernel_write);