sound/core/rawmidi.c

   1 /*
   2  *  Abstract layer for MIDI v1.0 stream
   3  *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
   4  *
   5  *
   6  *   This program is free software; you can redistribute it and/or modify
   7  *   it under the terms of the GNU General Public License as published by
   8  *   the Free Software Foundation; either version 2 of the License, or
   9  *   (at your option) any later version.
  10  *
  11  *   This program is distributed in the hope that it will be useful,
  12  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *   GNU General Public License for more details.
  15  *
  16  *   You should have received a copy of the GNU General Public License
  17  *   along with this program; if not, write to the Free Software
  18  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  19  *
  20  */
  21
  22 #include <sound/core.h>
  23 #include <linux/major.h>
  24 #include <linux/init.h>
  25 #include <linux/sched.h>
  26 #include <linux/slab.h>
  27 #include <linux/time.h>
  28 #include <linux/wait.h>
  29 #include <linux/mutex.h>
  30 #include <linux/module.h>
  31 #include <linux/delay.h>
  32 #include <sound/rawmidi.h>
  33 #include <sound/info.h>
  34 #include <sound/control.h>
  35 #include <sound/minors.h>
  36 #include <sound/initval.h>
  37
  38 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
  39 MODULE_DESCRIPTION("Midlevel RawMidi code for ALSA.");
  40 MODULE_LICENSE("GPL");
  41
  42 #ifdef CONFIG_SND_OSSEMUL
  43 static int midi_map[SNDRV_CARDS];
  44 static int amidi_map[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS-1)] = 1};
  45 module_param_array(midi_map, int, NULL, 0444);
  46 MODULE_PARM_DESC(midi_map, "Raw MIDI device number assigned to 1st OSS device.");
  47 module_param_array(amidi_map, int, NULL, 0444);
  48 MODULE_PARM_DESC(amidi_map, "Raw MIDI device number assigned to 2nd OSS device.");
  49 #endif /* CONFIG_SND_OSSEMUL */
  50
  51 static int snd_rawmidi_free(struct snd_rawmidi *rawmidi);
  52 static int snd_rawmidi_dev_free(struct snd_device *device);
  53 static int snd_rawmidi_dev_register(struct snd_device *device);
  54 static int snd_rawmidi_dev_disconnect(struct snd_device *device);
  55
  56 static LIST_HEAD(snd_rawmidi_devices);
  57 static DEFINE_MUTEX(register_mutex);
  58
  59 #define rmidi_err(rmidi, fmt, args...) \
  60         dev_err((rmidi)->card->dev, fmt, ##args)
  61 #define rmidi_warn(rmidi, fmt, args...) \
  62         dev_warn((rmidi)->card->dev, fmt, ##args)
  63 #define rmidi_dbg(rmidi, fmt, args...) \
  64         dev_dbg((rmidi)->card->dev, fmt, ##args)
  65
  66 static struct snd_rawmidi *snd_rawmidi_search(struct snd_card *card, int device)
  67 {
  68         struct snd_rawmidi *rawmidi;
  69
  70         list_for_each_entry(rawmidi, &snd_rawmidi_devices, list)
  71                 if (rawmidi->card == card && rawmidi->device == device)
  72                         return rawmidi;
  73         return NULL;
  74 }
  75
  76 static inline unsigned short snd_rawmidi_file_flags(struct file *file)
  77 {
  78         switch (file->f_mode & (FMODE_READ | FMODE_WRITE)) {
  79         case FMODE_WRITE:
  80                 return SNDRV_RAWMIDI_LFLG_OUTPUT;
  81         case FMODE_READ:
  82                 return SNDRV_RAWMIDI_LFLG_INPUT;
  83         default:
  84                 return SNDRV_RAWMIDI_LFLG_OPEN;
  85         }
  86 }
  87
  88 static inline int snd_rawmidi_ready(struct snd_rawmidi_substream *substream)
  89 {
  90         struct snd_rawmidi_runtime *runtime = substream->runtime;
  91         return runtime->avail >= runtime->avail_min;
  92 }
  93
  94 static inline int snd_rawmidi_ready_append(struct snd_rawmidi_substream *substream,
  95                                            size_t count)
  96 {
  97         struct snd_rawmidi_runtime *runtime = substream->runtime;
  98         return runtime->avail >= runtime->avail_min &&
  99                (!substream->append || runtime->avail >= count);
 100 }
 101
 102 static void snd_rawmidi_input_event_work(struct work_struct *work)
 103 {
 104         struct snd_rawmidi_runtime *runtime =
 105                 container_of(work, struct snd_rawmidi_runtime, event_work);
 106         if (runtime->event)
 107                 runtime->event(runtime->substream);
 108 }
 109
 110 static int snd_rawmidi_runtime_create(struct snd_rawmidi_substream *substream)
 111 {
 112         struct snd_rawmidi_runtime *runtime;
 113
 114         if ((runtime = kzalloc(sizeof(*runtime), GFP_KERNEL)) == NULL)
 115                 return -ENOMEM;
 116         runtime->substream = substream;
 117         spin_lock_init(&runtime->lock);
 118         init_waitqueue_head(&runtime->sleep);
 119         INIT_WORK(&runtime->event_work, snd_rawmidi_input_event_work);
 120         runtime->event = NULL;
 121         runtime->buffer_size = PAGE_SIZE;
 122         runtime->avail_min = 1;
 123         if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
 124                 runtime->avail = 0;
 125         else
 126                 runtime->avail = runtime->buffer_size;
 127         if ((runtime->buffer = kmalloc(runtime->buffer_size, GFP_KERNEL)) == NULL) {
 128                 kfree(runtime);
 129                 return -ENOMEM;
 130         }
 131         runtime->appl_ptr = runtime->hw_ptr = 0;
 132         substream->runtime = runtime;
 133         return 0;
 134 }
 135
 136 static int snd_rawmidi_runtime_free(struct snd_rawmidi_substream *substream)
 137 {
 138         struct snd_rawmidi_runtime *runtime = substream->runtime;
 139
 140         kfree(runtime->buffer);
 141         kfree(runtime);
 142         substream->runtime = NULL;
 143         return 0;
 144 }
 145
 146 static inline void snd_rawmidi_output_trigger(struct snd_rawmidi_substream *substream,int up)
 147 {
 148         if (!substream->opened)
 149                 return;
 150         substream->ops->trigger(substream, up);
 151 }
 152
 153 static void snd_rawmidi_input_trigger(struct snd_rawmidi_substream *substream, int up)
 154 {
 155         if (!substream->opened)
 156                 return;
 157         substream->ops->trigger(substream, up);
 158         if (!up)
 159                 cancel_work_sync(&substream->runtime->event_work);
 160 }
 161
 162 int snd_rawmidi_drop_output(struct snd_rawmidi_substream *substream)
 163 {
 164         unsigned long flags;
 165         struct snd_rawmidi_runtime *runtime = substream->runtime;
 166
 167         snd_rawmidi_output_trigger(substream, 0);
 168         runtime->drain = 0;
 169         spin_lock_irqsave(&runtime->lock, flags);
 170         runtime->appl_ptr = runtime->hw_ptr = 0;
 171         runtime->avail = runtime->buffer_size;
 172         spin_unlock_irqrestore(&runtime->lock, flags);
 173         return 0;
 174 }
 175 EXPORT_SYMBOL(snd_rawmidi_drop_output);
 176
 177 int snd_rawmidi_drain_output(struct snd_rawmidi_substream *substream)
 178 {
 179         int err;
 180         long timeout;
 181         struct snd_rawmidi_runtime *runtime = substream->runtime;
 182
 183         err = 0;
 184         runtime->drain = 1;
 185         timeout = wait_event_interruptible_timeout(runtime->sleep,
 186                                 (runtime->avail >= runtime->buffer_size),
 187                                 10*HZ);
 188         if (signal_pending(current))
 189                 err = -ERESTARTSYS;
 190         if (runtime->avail < runtime->buffer_size && !timeout) {
 191                 rmidi_warn(substream->rmidi,
 192                            "rawmidi drain error (avail = %li, buffer_size = %li)\n",
 193                            (long)runtime->avail, (long)runtime->buffer_size);
 194                 err = -EIO;
 195         }
 196         runtime->drain = 0;
 197         if (err != -ERESTARTSYS) {
 198                 /* we need wait a while to make sure that Tx FIFOs are empty */
 199                 if (substream->ops->drain)
 200                         substream->ops->drain(substream);
 201                 else
 202                         msleep(50);
 203                 snd_rawmidi_drop_output(substream);
 204         }
 205         return err;
 206 }
 207 EXPORT_SYMBOL(snd_rawmidi_drain_output);
 208
 209 int snd_rawmidi_drain_input(struct snd_rawmidi_substream *substream)
 210 {
 211         unsigned long flags;
 212         struct snd_rawmidi_runtime *runtime = substream->runtime;
 213
 214         snd_rawmidi_input_trigger(substream, 0);
 215         runtime->drain = 0;
 216         spin_lock_irqsave(&runtime->lock, flags);
 217         runtime->appl_ptr = runtime->hw_ptr = 0;
 218         runtime->avail = 0;
 219         spin_unlock_irqrestore(&runtime->lock, flags);
 220         return 0;
 221 }
 222 EXPORT_SYMBOL(snd_rawmidi_drain_input);
 223
 224 /* look for an available substream for the given stream direction;
 225  * if a specific subdevice is given, try to assign it
 226  */
 227 static int assign_substream(struct snd_rawmidi *rmidi, int subdevice,
 228                             int stream, int mode,
 229                             struct snd_rawmidi_substream **sub_ret)
 230 {
 231         struct snd_rawmidi_substream *substream;
 232         struct snd_rawmidi_str *s = &rmidi->streams[stream];
 233         static unsigned int info_flags[2] = {
 234                 [SNDRV_RAWMIDI_STREAM_OUTPUT] = SNDRV_RAWMIDI_INFO_OUTPUT,
 235                 [SNDRV_RAWMIDI_STREAM_INPUT] = SNDRV_RAWMIDI_INFO_INPUT,
 236         };
 237
 238         if (!(rmidi->info_flags & info_flags[stream]))
 239                 return -ENXIO;
 240         if (subdevice >= 0 && subdevice >= s->substream_count)
 241                 return -ENODEV;
 242
 243         list_for_each_entry(substream, &s->substreams, list) {
 244                 if (substream->opened) {
 245                         if (stream == SNDRV_RAWMIDI_STREAM_INPUT ||
 246                             !(mode & SNDRV_RAWMIDI_LFLG_APPEND) ||
 247                             !substream->append)
 248                                 continue;
 249                 }
 250                 if (subdevice < 0 || subdevice == substream->number) {
 251                         *sub_ret = substream;
 252                         return 0;
 253                 }
 254         }
 255         return -EAGAIN;
 256 }
 257
 258 /* open and do ref-counting for the given substream */
 259 static int open_substream(struct snd_rawmidi *rmidi,
 260                           struct snd_rawmidi_substream *substream,
 261                           int mode)
 262 {
 263         int err;
 264
 265         if (substream->use_count == 0) {
 266                 err = snd_rawmidi_runtime_create(substream);
 267                 if (err < 0)
 268                         return err;
 269                 err = substream->ops->open(substream);
 270                 if (err < 0) {
 271                         snd_rawmidi_runtime_free(substream);
 272                         return err;
 273                 }
 274                 substream->opened = 1;
 275                 substream->active_sensing = 0;
 276                 if (mode & SNDRV_RAWMIDI_LFLG_APPEND)
 277                         substream->append = 1;
 278                 substream->pid = get_pid(task_pid(current));
 279                 rmidi->streams[substream->stream].substream_opened++;
 280         }
 281         substream->use_count++;
 282         return 0;
 283 }
 284
 285 static void close_substream(struct snd_rawmidi *rmidi,
 286                             struct snd_rawmidi_substream *substream,
 287                             int cleanup);
 288
 289 static int rawmidi_open_priv(struct snd_rawmidi *rmidi, int subdevice, int mode,
 290                              struct snd_rawmidi_file *rfile)
 291 {
 292         struct snd_rawmidi_substream *sinput = NULL, *soutput = NULL;
 293         int err;
 294
 295         rfile->input = rfile->output = NULL;
 296         if (mode & SNDRV_RAWMIDI_LFLG_INPUT) {
 297                 err = assign_substream(rmidi, subdevice,
 298                                        SNDRV_RAWMIDI_STREAM_INPUT,
 299                                        mode, &sinput);
 300                 if (err < 0)
 301                         return err;
 302         }
 303         if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) {
 304                 err = assign_substream(rmidi, subdevice,
 305                                        SNDRV_RAWMIDI_STREAM_OUTPUT,
 306                                        mode, &soutput);
 307                 if (err < 0)
 308                         return err;
 309         }
 310
 311         if (sinput) {
 312                 err = open_substream(rmidi, sinput, mode);
 313                 if (err < 0)
 314                         return err;
 315         }
 316         if (soutput) {
 317                 err = open_substream(rmidi, soutput, mode);
 318                 if (err < 0) {
 319                         if (sinput)
 320                                 close_substream(rmidi, sinput, 0);
 321                         return err;
 322                 }
 323         }
 324
 325         rfile->rmidi = rmidi;
 326         rfile->input = sinput;
 327         rfile->output = soutput;
 328         return 0;
 329 }
 330
 331 /* called from sound/core/seq/seq_midi.c */
 332 int snd_rawmidi_kernel_open(struct snd_card *card, int device, int subdevice,
 333                             int mode, struct snd_rawmidi_file * rfile)
 334 {
 335         struct snd_rawmidi *rmidi;
 336         int err;
 337
 338         if (snd_BUG_ON(!rfile))
 339                 return -EINVAL;
 340
 341         mutex_lock(&register_mutex);
 342         rmidi = snd_rawmidi_search(card, device);
 343         if (rmidi == NULL) {
 344                 mutex_unlock(&register_mutex);
 345                 return -ENODEV;
 346         }
 347         if (!try_module_get(rmidi->card->module)) {
 348                 mutex_unlock(&register_mutex);
 349                 return -ENXIO;
 350         }
 351         mutex_unlock(&register_mutex);
 352
 353         mutex_lock(&rmidi->open_mutex);
 354         err = rawmidi_open_priv(rmidi, subdevice, mode, rfile);
 355         mutex_unlock(&rmidi->open_mutex);
 356         if (err < 0)
 357                 module_put(rmidi->card->module);
 358         return err;
 359 }
 360 EXPORT_SYMBOL(snd_rawmidi_kernel_open);
 361
 362 static int snd_rawmidi_open(struct inode *inode, struct file *file)
 363 {
 364         int maj = imajor(inode);
 365         struct snd_card *card;
 366         int subdevice;
 367         unsigned short fflags;
 368         int err;
 369         struct snd_rawmidi *rmidi;
 370         struct snd_rawmidi_file *rawmidi_file = NULL;
 371         wait_queue_t wait;
 372         struct snd_ctl_file *kctl;
 373
 374         if ((file->f_flags & O_APPEND) && !(file->f_flags & O_NONBLOCK))
 375                 return -EINVAL;         /* invalid combination */
 376
 377         err = nonseekable_open(inode, file);
 378         if (err < 0)
 379                 return err;
 380
 381         if (maj == snd_major) {
 382                 rmidi = snd_lookup_minor_data(iminor(inode),
 383                                               SNDRV_DEVICE_TYPE_RAWMIDI);
 384 #ifdef CONFIG_SND_OSSEMUL
 385         } else if (maj == SOUND_MAJOR) {
 386                 rmidi = snd_lookup_oss_minor_data(iminor(inode),
 387                                                   SNDRV_OSS_DEVICE_TYPE_MIDI);
 388 #endif
 389         } else
 390                 return -ENXIO;
 391
 392         if (rmidi == NULL)
 393                 return -ENODEV;
 394
 395         if (!try_module_get(rmidi->card->module)) {
 396                 snd_card_unref(rmidi->card);
 397                 return -ENXIO;
 398         }
 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 (rmidi->card->shutdown) {
 441                         err = -ENODEV;
 442                         break;
 443                 }
 444                 if (signal_pending(current)) {
 445                         err = -ERESTARTSYS;
 446                         break;
 447                 }
 448         }
 449         remove_wait_queue(&rmidi->open_wait, &wait);
 450         if (err < 0) {
 451                 kfree(rawmidi_file);
 452                 goto __error;
 453         }
 454 #ifdef CONFIG_SND_OSSEMUL
 455         if (rawmidi_file->input && rawmidi_file->input->runtime)
 456                 rawmidi_file->input->runtime->oss = (maj == SOUND_MAJOR);
 457         if (rawmidi_file->output && rawmidi_file->output->runtime)
 458                 rawmidi_file->output->runtime->oss = (maj == SOUND_MAJOR);
 459 #endif
 460         file->private_data = rawmidi_file;
 461         mutex_unlock(&rmidi->open_mutex);
 462         snd_card_unref(rmidi->card);
 463         return 0;
 464
 465  __error:
 466         snd_card_file_remove(card, file);
 467  __error_card:
 468         mutex_unlock(&rmidi->open_mutex);
 469         module_put(rmidi->card->module);
 470         snd_card_unref(rmidi->card);
 471         return err;
 472 }
 473
 474 static void close_substream(struct snd_rawmidi *rmidi,
 475                             struct snd_rawmidi_substream *substream,
 476                             int cleanup)
 477 {
 478         if (--substream->use_count)
 479                 return;
 480
 481         if (cleanup) {
 482                 if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
 483                         snd_rawmidi_input_trigger(substream, 0);
 484                 else {
 485                         if (substream->active_sensing) {
 486                                 unsigned char buf = 0xfe;
 487                                 /* sending single active sensing message
 488                                  * to shut the device up
 489                                  */
 490                                 snd_rawmidi_kernel_write(substream, &buf, 1);
 491                         }
 492                         if (snd_rawmidi_drain_output(substream) == -ERESTARTSYS)
 493                                 snd_rawmidi_output_trigger(substream, 0);
 494                 }
 495         }
 496         substream->ops->close(substream);
 497         if (substream->runtime->private_free)
 498                 substream->runtime->private_free(substream);
 499         snd_rawmidi_runtime_free(substream);
 500         substream->opened = 0;
 501         substream->append = 0;
 502         put_pid(substream->pid);
 503         substream->pid = NULL;
 504         rmidi->streams[substream->stream].substream_opened--;
 505 }
 506
 507 static void rawmidi_release_priv(struct snd_rawmidi_file *rfile)
 508 {
 509         struct snd_rawmidi *rmidi;
 510
 511         rmidi = rfile->rmidi;
 512         mutex_lock(&rmidi->open_mutex);
 513         if (rfile->input) {
 514                 close_substream(rmidi, rfile->input, 1);
 515                 rfile->input = NULL;
 516         }
 517         if (rfile->output) {
 518                 close_substream(rmidi, rfile->output, 1);
 519                 rfile->output = NULL;
 520         }
 521         rfile->rmidi = NULL;
 522         mutex_unlock(&rmidi->open_mutex);
 523         wake_up(&rmidi->open_wait);
 524 }
 525
 526 /* called from sound/core/seq/seq_midi.c */
 527 int snd_rawmidi_kernel_release(struct snd_rawmidi_file *rfile)
 528 {
 529         struct snd_rawmidi *rmidi;
 530
 531         if (snd_BUG_ON(!rfile))
 532                 return -ENXIO;
 533
 534         rmidi = rfile->rmidi;
 535         rawmidi_release_priv(rfile);
 536         module_put(rmidi->card->module);
 537         return 0;
 538 }
 539 EXPORT_SYMBOL(snd_rawmidi_kernel_release);
 540
 541 static int snd_rawmidi_release(struct inode *inode, struct file *file)
 542 {
 543         struct snd_rawmidi_file *rfile;
 544         struct snd_rawmidi *rmidi;
 545         struct module *module;
 546
 547         rfile = file->private_data;
 548         rmidi = rfile->rmidi;
 549         rawmidi_release_priv(rfile);
 550         kfree(rfile);
 551         module = rmidi->card->module;
 552         snd_card_file_remove(rmidi->card, file);
 553         module_put(module);
 554         return 0;
 555 }
 556
 557 static int snd_rawmidi_info(struct snd_rawmidi_substream *substream,
 558                             struct snd_rawmidi_info *info)
 559 {
 560         struct snd_rawmidi *rmidi;
 561
 562         if (substream == NULL)
 563                 return -ENODEV;
 564         rmidi = substream->rmidi;
 565         memset(info, 0, sizeof(*info));
 566         info->card = rmidi->card->number;
 567         info->device = rmidi->device;
 568         info->subdevice = substream->number;
 569         info->stream = substream->stream;
 570         info->flags = rmidi->info_flags;
 571         strcpy(info->id, rmidi->id);
 572         strcpy(info->name, rmidi->name);
 573         strcpy(info->subname, substream->name);
 574         info->subdevices_count = substream->pstr->substream_count;
 575         info->subdevices_avail = (substream->pstr->substream_count -
 576                                   substream->pstr->substream_opened);
 577         return 0;
 578 }
 579
 580 static int snd_rawmidi_info_user(struct snd_rawmidi_substream *substream,
 581                                  struct snd_rawmidi_info __user * _info)
 582 {
 583         struct snd_rawmidi_info info;
 584         int err;
 585         if ((err = snd_rawmidi_info(substream, &info)) < 0)
 586                 return err;
 587         if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
 588                 return -EFAULT;
 589         return 0;
 590 }
 591
 592 int snd_rawmidi_info_select(struct snd_card *card, struct snd_rawmidi_info *info)
 593 {
 594         struct snd_rawmidi *rmidi;
 595         struct snd_rawmidi_str *pstr;
 596         struct snd_rawmidi_substream *substream;
 597
 598         mutex_lock(&register_mutex);
 599         rmidi = snd_rawmidi_search(card, info->device);
 600         mutex_unlock(&register_mutex);
 601         if (!rmidi)
 602                 return -ENXIO;
 603         if (info->stream < 0 || info->stream > 1)
 604                 return -EINVAL;
 605         pstr = &rmidi->streams[info->stream];
 606         if (pstr->substream_count == 0)
 607                 return -ENOENT;
 608         if (info->subdevice >= pstr->substream_count)
 609                 return -ENXIO;
 610         list_for_each_entry(substream, &pstr->substreams, list) {
 611                 if ((unsigned int)substream->number == info->subdevice)
 612                         return snd_rawmidi_info(substream, info);
 613         }
 614         return -ENXIO;
 615 }
 616 EXPORT_SYMBOL(snd_rawmidi_info_select);
 617
 618 static int snd_rawmidi_info_select_user(struct snd_card *card,
 619                                         struct snd_rawmidi_info __user *_info)
 620 {
 621         int err;
 622         struct snd_rawmidi_info info;
 623         if (get_user(info.device, &_info->device))
 624                 return -EFAULT;
 625         if (get_user(info.stream, &_info->stream))
 626                 return -EFAULT;
 627         if (get_user(info.subdevice, &_info->subdevice))
 628                 return -EFAULT;
 629         if ((err = snd_rawmidi_info_select(card, &info)) < 0)
 630                 return err;
 631         if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
 632                 return -EFAULT;
 633         return 0;
 634 }
 635
 636 int snd_rawmidi_output_params(struct snd_rawmidi_substream *substream,
 637                               struct snd_rawmidi_params * params)
 638 {
 639         char *newbuf;
 640         struct snd_rawmidi_runtime *runtime = substream->runtime;
 641
 642         if (substream->append && substream->use_count > 1)
 643                 return -EBUSY;
 644         snd_rawmidi_drain_output(substream);
 645         if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L) {
 646                 return -EINVAL;
 647         }
 648         if (params->avail_min < 1 || params->avail_min > params->buffer_size) {
 649                 return -EINVAL;
 650         }
 651         if (params->buffer_size != runtime->buffer_size) {
 652                 newbuf = krealloc(runtime->buffer, params->buffer_size,
 653                                   GFP_KERNEL);
 654                 if (!newbuf)
 655                         return -ENOMEM;
 656                 runtime->buffer = newbuf;
 657                 runtime->buffer_size = params->buffer_size;
 658                 runtime->avail = runtime->buffer_size;
 659         }
 660         runtime->avail_min = params->avail_min;
 661         substream->active_sensing = !params->no_active_sensing;
 662         return 0;
 663 }
 664 EXPORT_SYMBOL(snd_rawmidi_output_params);
 665
 666 int snd_rawmidi_input_params(struct snd_rawmidi_substream *substream,
 667                              struct snd_rawmidi_params * params)
 668 {
 669         char *newbuf;
 670         struct snd_rawmidi_runtime *runtime = substream->runtime;
 671
 672         snd_rawmidi_drain_input(substream);
 673         if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L) {
 674                 return -EINVAL;
 675         }
 676         if (params->avail_min < 1 || params->avail_min > params->buffer_size) {
 677                 return -EINVAL;
 678         }
 679         if (params->buffer_size != runtime->buffer_size) {
 680                 newbuf = krealloc(runtime->buffer, params->buffer_size,
 681                                   GFP_KERNEL);
 682                 if (!newbuf)
 683                         return -ENOMEM;
 684                 runtime->buffer = newbuf;
 685                 runtime->buffer_size = params->buffer_size;
 686         }
 687         runtime->avail_min = params->avail_min;
 688         return 0;
 689 }
 690 EXPORT_SYMBOL(snd_rawmidi_input_params);
 691
 692 static int snd_rawmidi_output_status(struct snd_rawmidi_substream *substream,
 693                                      struct snd_rawmidi_status * status)
 694 {
 695         struct snd_rawmidi_runtime *runtime = substream->runtime;
 696
 697         memset(status, 0, sizeof(*status));
 698         status->stream = SNDRV_RAWMIDI_STREAM_OUTPUT;
 699         spin_lock_irq(&runtime->lock);
 700         status->avail = runtime->avail;
 701         spin_unlock_irq(&runtime->lock);
 702         return 0;
 703 }
 704
 705 static int snd_rawmidi_input_status(struct snd_rawmidi_substream *substream,
 706                                     struct snd_rawmidi_status * status)
 707 {
 708         struct snd_rawmidi_runtime *runtime = substream->runtime;
 709
 710         memset(status, 0, sizeof(*status));
 711         status->stream = SNDRV_RAWMIDI_STREAM_INPUT;
 712         spin_lock_irq(&runtime->lock);
 713         status->avail = runtime->avail;
 714         status->xruns = runtime->xruns;
 715         runtime->xruns = 0;
 716         spin_unlock_irq(&runtime->lock);
 717         return 0;
 718 }
 719
 720 static long snd_rawmidi_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 721 {
 722         struct snd_rawmidi_file *rfile;
 723         void __user *argp = (void __user *)arg;
 724
 725         rfile = file->private_data;
 726         if (((cmd >> 8) & 0xff) != 'W')
 727                 return -ENOTTY;
 728         switch (cmd) {
 729         case SNDRV_RAWMIDI_IOCTL_PVERSION:
 730                 return put_user(SNDRV_RAWMIDI_VERSION, (int __user *)argp) ? -EFAULT : 0;
 731         case SNDRV_RAWMIDI_IOCTL_INFO:
 732         {
 733                 int stream;
 734                 struct snd_rawmidi_info __user *info = argp;
 735                 if (get_user(stream, &info->stream))
 736                         return -EFAULT;
 737                 switch (stream) {
 738                 case SNDRV_RAWMIDI_STREAM_INPUT:
 739                         return snd_rawmidi_info_user(rfile->input, info);
 740                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
 741                         return snd_rawmidi_info_user(rfile->output, info);
 742                 default:
 743                         return -EINVAL;
 744                 }
 745         }
 746         case SNDRV_RAWMIDI_IOCTL_PARAMS:
 747         {
 748                 struct snd_rawmidi_params params;
 749                 if (copy_from_user(&params, argp, sizeof(struct snd_rawmidi_params)))
 750                         return -EFAULT;
 751                 switch (params.stream) {
 752                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
 753                         if (rfile->output == NULL)
 754                                 return -EINVAL;
 755                         return snd_rawmidi_output_params(rfile->output, &params);
 756                 case SNDRV_RAWMIDI_STREAM_INPUT:
 757                         if (rfile->input == NULL)
 758                                 return -EINVAL;
 759                         return snd_rawmidi_input_params(rfile->input, &params);
 760                 default:
 761                         return -EINVAL;
 762                 }
 763         }
 764         case SNDRV_RAWMIDI_IOCTL_STATUS:
 765         {
 766                 int err = 0;
 767                 struct snd_rawmidi_status status;
 768                 if (copy_from_user(&status, argp, sizeof(struct snd_rawmidi_status)))
 769                         return -EFAULT;
 770                 switch (status.stream) {
 771                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
 772                         if (rfile->output == NULL)
 773                                 return -EINVAL;
 774                         err = snd_rawmidi_output_status(rfile->output, &status);
 775                         break;
 776                 case SNDRV_RAWMIDI_STREAM_INPUT:
 777                         if (rfile->input == NULL)
 778                                 return -EINVAL;
 779                         err = snd_rawmidi_input_status(rfile->input, &status);
 780                         break;
 781                 default:
 782                         return -EINVAL;
 783                 }
 784                 if (err < 0)
 785                         return err;
 786                 if (copy_to_user(argp, &status, sizeof(struct snd_rawmidi_status)))
 787                         return -EFAULT;
 788                 return 0;
 789         }
 790         case SNDRV_RAWMIDI_IOCTL_DROP:
 791         {
 792                 int val;
 793                 if (get_user(val, (int __user *) argp))
 794                         return -EFAULT;
 795                 switch (val) {
 796                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
 797                         if (rfile->output == NULL)
 798                                 return -EINVAL;
 799                         return snd_rawmidi_drop_output(rfile->output);
 800                 default:
 801                         return -EINVAL;
 802                 }
 803         }
 804         case SNDRV_RAWMIDI_IOCTL_DRAIN:
 805         {
 806                 int val;
 807                 if (get_user(val, (int __user *) argp))
 808                         return -EFAULT;
 809                 switch (val) {
 810                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
 811                         if (rfile->output == NULL)
 812                                 return -EINVAL;
 813                         return snd_rawmidi_drain_output(rfile->output);
 814                 case SNDRV_RAWMIDI_STREAM_INPUT:
 815                         if (rfile->input == NULL)
 816                                 return -EINVAL;
 817                         return snd_rawmidi_drain_input(rfile->input);
 818                 default:
 819                         return -EINVAL;
 820                 }
 821         }
 822         default:
 823                 rmidi_dbg(rfile->rmidi,
 824                           "rawmidi: unknown command = 0x%x\n", cmd);
 825         }
 826         return -ENOTTY;
 827 }
 828
 829 static int snd_rawmidi_control_ioctl(struct snd_card *card,
 830                                      struct snd_ctl_file *control,
 831                                      unsigned int cmd,
 832                                      unsigned long arg)
 833 {
 834         void __user *argp = (void __user *)arg;
 835
 836         switch (cmd) {
 837         case SNDRV_CTL_IOCTL_RAWMIDI_NEXT_DEVICE:
 838         {
 839                 int device;
 840
 841                 if (get_user(device, (int __user *)argp))
 842                         return -EFAULT;
 843                 if (device >= SNDRV_RAWMIDI_DEVICES) /* next device is -1 */
 844                         device = SNDRV_RAWMIDI_DEVICES - 1;
 845                 mutex_lock(&register_mutex);
 846                 device = device < 0 ? 0 : device + 1;
 847                 while (device < SNDRV_RAWMIDI_DEVICES) {
 848                         if (snd_rawmidi_search(card, device))
 849                                 break;
 850                         device++;
 851                 }
 852                 if (device == SNDRV_RAWMIDI_DEVICES)
 853                         device = -1;
 854                 mutex_unlock(&register_mutex);
 855                 if (put_user(device, (int __user *)argp))
 856                         return -EFAULT;
 857                 return 0;
 858         }
 859         case SNDRV_CTL_IOCTL_RAWMIDI_PREFER_SUBDEVICE:
 860         {
 861                 int val;
 862
 863                 if (get_user(val, (int __user *)argp))
 864                         return -EFAULT;
 865                 control->prefer_rawmidi_subdevice = val;
 866                 return 0;
 867         }
 868         case SNDRV_CTL_IOCTL_RAWMIDI_INFO:
 869                 return snd_rawmidi_info_select_user(card, argp);
 870         }
 871         return -ENOIOCTLCMD;
 872 }
 873
 874 /**
 875  * snd_rawmidi_receive - receive the input data from the device
 876  * @substream: the rawmidi substream
 877  * @buffer: the buffer pointer
 878  * @count: the data size to read
 879  *
 880  * Reads the data from the internal buffer.
 881  *
 882  * Return: The size of read data, or a negative error code on failure.
 883  */
 884 int snd_rawmidi_receive(struct snd_rawmidi_substream *substream,
 885                         const unsigned char *buffer, int count)
 886 {
 887         unsigned long flags;
 888         int result = 0, count1;
 889         struct snd_rawmidi_runtime *runtime = substream->runtime;
 890
 891         if (!substream->opened)
 892                 return -EBADFD;
 893         if (runtime->buffer == NULL) {
 894                 rmidi_dbg(substream->rmidi,
 895                           "snd_rawmidi_receive: input is not active!!!\n");
 896                 return -EINVAL;
 897         }
 898         spin_lock_irqsave(&runtime->lock, flags);
 899         if (count == 1) {       /* special case, faster code */
 900                 substream->bytes++;
 901                 if (runtime->avail < runtime->buffer_size) {
 902                         runtime->buffer[runtime->hw_ptr++] = buffer[0];
 903                         runtime->hw_ptr %= runtime->buffer_size;
 904                         runtime->avail++;
 905                         result++;
 906                 } else {
 907                         runtime->xruns++;
 908                 }
 909         } else {
 910                 substream->bytes += count;
 911                 count1 = runtime->buffer_size - runtime->hw_ptr;
 912                 if (count1 > count)
 913                         count1 = count;
 914                 if (count1 > (int)(runtime->buffer_size - runtime->avail))
 915                         count1 = runtime->buffer_size - runtime->avail;
 916                 memcpy(runtime->buffer + runtime->hw_ptr, buffer, count1);
 917                 runtime->hw_ptr += count1;
 918                 runtime->hw_ptr %= runtime->buffer_size;
 919                 runtime->avail += count1;
 920                 count -= count1;
 921                 result += count1;
 922                 if (count > 0) {
 923                         buffer += count1;
 924                         count1 = count;
 925                         if (count1 > (int)(runtime->buffer_size - runtime->avail)) {
 926                                 count1 = runtime->buffer_size - runtime->avail;
 927                                 runtime->xruns += count - count1;
 928                         }
 929                         if (count1 > 0) {
 930                                 memcpy(runtime->buffer, buffer, count1);
 931                                 runtime->hw_ptr = count1;
 932                                 runtime->avail += count1;
 933                                 result += count1;
 934                         }
 935                 }
 936         }
 937         if (result > 0) {
 938                 if (runtime->event)
 939                         schedule_work(&runtime->event_work);
 940                 else if (snd_rawmidi_ready(substream))
 941                         wake_up(&runtime->sleep);
 942         }
 943         spin_unlock_irqrestore(&runtime->lock, flags);
 944         return result;
 945 }
 946 EXPORT_SYMBOL(snd_rawmidi_receive);
 947
 948 static long snd_rawmidi_kernel_read1(struct snd_rawmidi_substream *substream,
 949                                      unsigned char __user *userbuf,
 950                                      unsigned char *kernelbuf, long count)
 951 {
 952         unsigned long flags;
 953         long result = 0, count1;
 954         struct snd_rawmidi_runtime *runtime = substream->runtime;
 955
 956         while (count > 0 && runtime->avail) {
 957                 count1 = runtime->buffer_size - runtime->appl_ptr;
 958                 if (count1 > count)
 959                         count1 = count;
 960                 spin_lock_irqsave(&runtime->lock, flags);
 961                 if (count1 > (int)runtime->avail)
 962                         count1 = runtime->avail;
 963                 if (kernelbuf)
 964                         memcpy(kernelbuf + result, runtime->buffer + runtime->appl_ptr, count1);
 965                 if (userbuf) {
 966                         spin_unlock_irqrestore(&runtime->lock, flags);
 967                         if (copy_to_user(userbuf + result,
 968                                          runtime->buffer + runtime->appl_ptr, count1)) {
 969                                 return result > 0 ? result : -EFAULT;
 970                         }
 971                         spin_lock_irqsave(&runtime->lock, flags);
 972                 }
 973                 runtime->appl_ptr += count1;
 974                 runtime->appl_ptr %= runtime->buffer_size;
 975                 runtime->avail -= count1;
 976                 spin_unlock_irqrestore(&runtime->lock, flags);
 977                 result += count1;
 978                 count -= count1;
 979         }
 980         return result;
 981 }
 982
 983 long snd_rawmidi_kernel_read(struct snd_rawmidi_substream *substream,
 984                              unsigned char *buf, long count)
 985 {
 986         snd_rawmidi_input_trigger(substream, 1);
 987         return snd_rawmidi_kernel_read1(substream, NULL/*userbuf*/, buf, count);
 988 }
 989 EXPORT_SYMBOL(snd_rawmidi_kernel_read);
 990
 991 static ssize_t snd_rawmidi_read(struct file *file, char __user *buf, size_t count,
 992                                 loff_t *offset)
 993 {
 994         long result;
 995         int count1;
 996         struct snd_rawmidi_file *rfile;
 997         struct snd_rawmidi_substream *substream;
 998         struct snd_rawmidi_runtime *runtime;
 999
1000         rfile = file->private_data;
1001         substream = rfile->input;
1002         if (substream == NULL)
1003                 return -EIO;
1004         runtime = substream->runtime;
1005         snd_rawmidi_input_trigger(substream, 1);
1006         result = 0;
1007         while (count > 0) {
1008                 spin_lock_irq(&runtime->lock);
1009                 while (!snd_rawmidi_ready(substream)) {
1010                         wait_queue_t wait;
1011                         if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1012                                 spin_unlock_irq(&runtime->lock);
1013                                 return result > 0 ? result : -EAGAIN;
1014                         }
1015                         init_waitqueue_entry(&wait, current);
1016                         add_wait_queue(&runtime->sleep, &wait);
1017                         set_current_state(TASK_INTERRUPTIBLE);
1018                         spin_unlock_irq(&runtime->lock);
1019                         schedule();
1020                         remove_wait_queue(&runtime->sleep, &wait);
1021                         if (rfile->rmidi->card->shutdown)
1022                                 return -ENODEV;
1023                         if (signal_pending(current))
1024                                 return result > 0 ? result : -ERESTARTSYS;
1025                         if (!runtime->avail)
1026                                 return result > 0 ? result : -EIO;
1027                         spin_lock_irq(&runtime->lock);
1028                 }
1029                 spin_unlock_irq(&runtime->lock);
1030                 count1 = snd_rawmidi_kernel_read1(substream,
1031                                                   (unsigned char __user *)buf,
1032                                                   NULL/*kernelbuf*/,
1033                                                   count);
1034                 if (count1 < 0)
1035                         return result > 0 ? result : count1;
1036                 result += count1;
1037                 buf += count1;
1038                 count -= count1;
1039         }
1040         return result;
1041 }
1042
1043 /**
1044  * snd_rawmidi_transmit_empty - check whether the output buffer is empty
1045  * @substream: the rawmidi substream
1046  *
1047  * Return: 1 if the internal output buffer is empty, 0 if not.
1048  */
1049 int snd_rawmidi_transmit_empty(struct snd_rawmidi_substream *substream)
1050 {
1051         struct snd_rawmidi_runtime *runtime = substream->runtime;
1052         int result;
1053         unsigned long flags;
1054
1055         if (runtime->buffer == NULL) {
1056                 rmidi_dbg(substream->rmidi,
1057                           "snd_rawmidi_transmit_empty: output is not active!!!\n");
1058                 return 1;
1059         }
1060         spin_lock_irqsave(&runtime->lock, flags);
1061         result = runtime->avail >= runtime->buffer_size;
1062         spin_unlock_irqrestore(&runtime->lock, flags);
1063         return result;
1064 }
1065 EXPORT_SYMBOL(snd_rawmidi_transmit_empty);
1066
1067 /**
1068  * snd_rawmidi_transmit_peek - copy data from the internal buffer
1069  * @substream: the rawmidi substream
1070  * @buffer: the buffer pointer
1071  * @count: data size to transfer
1072  *
1073  * Copies data from the internal output buffer to the given buffer.
1074  *
1075  * Call this in the interrupt handler when the midi output is ready,
1076  * and call snd_rawmidi_transmit_ack() after the transmission is
1077  * finished.
1078  *
1079  * Return: The size of copied data, or a negative error code on failure.
1080  */
1081 int snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
1082                               unsigned char *buffer, int count)
1083 {
1084         unsigned long flags;
1085         int result, count1;
1086         struct snd_rawmidi_runtime *runtime = substream->runtime;
1087
1088         if (runtime->buffer == NULL) {
1089                 rmidi_dbg(substream->rmidi,
1090                           "snd_rawmidi_transmit_peek: output is not active!!!\n");
1091                 return -EINVAL;
1092         }
1093         result = 0;
1094         spin_lock_irqsave(&runtime->lock, flags);
1095         if (runtime->avail >= runtime->buffer_size) {
1096                 /* warning: lowlevel layer MUST trigger down the hardware */
1097                 goto __skip;
1098         }
1099         if (count == 1) {       /* special case, faster code */
1100                 *buffer = runtime->buffer[runtime->hw_ptr];
1101                 result++;
1102         } else {
1103                 count1 = runtime->buffer_size - runtime->hw_ptr;
1104                 if (count1 > count)
1105                         count1 = count;
1106                 if (count1 > (int)(runtime->buffer_size - runtime->avail))
1107                         count1 = runtime->buffer_size - runtime->avail;
1108                 memcpy(buffer, runtime->buffer + runtime->hw_ptr, count1);
1109                 count -= count1;
1110                 result += count1;
1111                 if (count > 0) {
1112                         if (count > (int)(runtime->buffer_size - runtime->avail - count1))
1113                                 count = runtime->buffer_size - runtime->avail - count1;
1114                         memcpy(buffer + count1, runtime->buffer, count);
1115                         result += count;
1116                 }
1117         }
1118       __skip:
1119         spin_unlock_irqrestore(&runtime->lock, flags);
1120         return result;
1121 }
1122 EXPORT_SYMBOL(snd_rawmidi_transmit_peek);
1123
1124 /**
1125  * snd_rawmidi_transmit_ack - acknowledge the transmission
1126  * @substream: the rawmidi substream
1127  * @count: the transferred count
1128  *
1129  * Advances the hardware pointer for the internal output buffer with
1130  * the given size and updates the condition.
1131  * Call after the transmission is finished.
1132  *
1133  * Return: The advanced size if successful, or a negative error code on failure.
1134  */
1135 int snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count)
1136 {
1137         unsigned long flags;
1138         struct snd_rawmidi_runtime *runtime = substream->runtime;
1139
1140         if (runtime->buffer == NULL) {
1141                 rmidi_dbg(substream->rmidi,
1142                           "snd_rawmidi_transmit_ack: output is not active!!!\n");
1143                 return -EINVAL;
1144         }
1145         spin_lock_irqsave(&runtime->lock, flags);
1146         snd_BUG_ON(runtime->avail + count > runtime->buffer_size);
1147         runtime->hw_ptr += count;
1148         runtime->hw_ptr %= runtime->buffer_size;
1149         runtime->avail += count;
1150         substream->bytes += count;
1151         if (count > 0) {
1152                 if (runtime->drain || snd_rawmidi_ready(substream))
1153                         wake_up(&runtime->sleep);
1154         }
1155         spin_unlock_irqrestore(&runtime->lock, flags);
1156         return count;
1157 }
1158 EXPORT_SYMBOL(snd_rawmidi_transmit_ack);
1159
1160 /**
1161  * snd_rawmidi_transmit - copy from the buffer to the device
1162  * @substream: the rawmidi substream
1163  * @buffer: the buffer pointer
1164  * @count: the data size to transfer
1165  *
1166  * Copies data from the buffer to the device and advances the pointer.
1167  *
1168  * Return: The copied size if successful, or a negative error code on failure.
1169  */
1170 int snd_rawmidi_transmit(struct snd_rawmidi_substream *substream,
1171                          unsigned char *buffer, int count)
1172 {
1173         if (!substream->opened)
1174                 return -EBADFD;
1175         count = snd_rawmidi_transmit_peek(substream, buffer, count);
1176         if (count < 0)
1177                 return count;
1178         return snd_rawmidi_transmit_ack(substream, count);
1179 }
1180 EXPORT_SYMBOL(snd_rawmidi_transmit);
1181
1182 static long snd_rawmidi_kernel_write1(struct snd_rawmidi_substream *substream,
1183                                       const unsigned char __user *userbuf,
1184                                       const unsigned char *kernelbuf,
1185                                       long count)
1186 {
1187         unsigned long flags;
1188         long count1, result;
1189         struct snd_rawmidi_runtime *runtime = substream->runtime;
1190
1191         if (snd_BUG_ON(!kernelbuf && !userbuf))
1192                 return -EINVAL;
1193         if (snd_BUG_ON(!runtime->buffer))
1194                 return -EINVAL;
1195
1196         result = 0;
1197         spin_lock_irqsave(&runtime->lock, flags);
1198         if (substream->append) {
1199                 if ((long)runtime->avail < count) {
1200                         spin_unlock_irqrestore(&runtime->lock, flags);
1201                         return -EAGAIN;
1202                 }
1203         }
1204         while (count > 0 && runtime->avail > 0) {
1205                 count1 = runtime->buffer_size - runtime->appl_ptr;
1206                 if (count1 > count)
1207                         count1 = count;
1208                 if (count1 > (long)runtime->avail)
1209                         count1 = runtime->avail;
1210                 if (kernelbuf)
1211                         memcpy(runtime->buffer + runtime->appl_ptr,
1212                                kernelbuf + result, count1);
1213                 else if (userbuf) {
1214                         spin_unlock_irqrestore(&runtime->lock, flags);
1215                         if (copy_from_user(runtime->buffer + runtime->appl_ptr,
1216                                            userbuf + result, count1)) {
1217                                 spin_lock_irqsave(&runtime->lock, flags);
1218                                 result = result > 0 ? result : -EFAULT;
1219                                 goto __end;
1220                         }
1221                         spin_lock_irqsave(&runtime->lock, flags);
1222                 }
1223                 runtime->appl_ptr += count1;
1224                 runtime->appl_ptr %= runtime->buffer_size;
1225                 runtime->avail -= count1;
1226                 result += count1;
1227                 count -= count1;
1228         }
1229       __end:
1230         count1 = runtime->avail < runtime->buffer_size;
1231         spin_unlock_irqrestore(&runtime->lock, flags);
1232         if (count1)
1233                 snd_rawmidi_output_trigger(substream, 1);
1234         return result;
1235 }
1236
1237 long snd_rawmidi_kernel_write(struct snd_rawmidi_substream *substream,
1238                               const unsigned char *buf, long count)
1239 {
1240         return snd_rawmidi_kernel_write1(substream, NULL, buf, count);
1241 }
1242 EXPORT_SYMBOL(snd_rawmidi_kernel_write);
1243
1244 static ssize_t snd_rawmidi_write(struct file *file, const char __user *buf,
1245                                  size_t count, loff_t *offset)
1246 {
1247         long result, timeout;
1248         int count1;
1249         struct snd_rawmidi_file *rfile;
1250         struct snd_rawmidi_runtime *runtime;
1251         struct snd_rawmidi_substream *substream;
1252
1253         rfile = file->private_data;
1254         substream = rfile->output;
1255         runtime = substream->runtime;
1256         /* we cannot put an atomic message to our buffer */
1257         if (substream->append && count > runtime->buffer_size)
1258                 return -EIO;
1259         result = 0;
1260         while (count > 0) {
1261                 spin_lock_irq(&runtime->lock);
1262                 while (!snd_rawmidi_ready_append(substream, count)) {
1263                         wait_queue_t wait;
1264                         if (file->f_flags & O_NONBLOCK) {
1265                                 spin_unlock_irq(&runtime->lock);
1266                                 return result > 0 ? result : -EAGAIN;
1267                         }
1268                         init_waitqueue_entry(&wait, current);
1269                         add_wait_queue(&runtime->sleep, &wait);
1270                         set_current_state(TASK_INTERRUPTIBLE);
1271                         spin_unlock_irq(&runtime->lock);
1272                         timeout = schedule_timeout(30 * HZ);
1273                         remove_wait_queue(&runtime->sleep, &wait);
1274                         if (rfile->rmidi->card->shutdown)
1275                                 return -ENODEV;
1276                         if (signal_pending(current))
1277                                 return result > 0 ? result : -ERESTARTSYS;
1278                         if (!runtime->avail && !timeout)
1279                                 return result > 0 ? result : -EIO;
1280                         spin_lock_irq(&runtime->lock);
1281                 }
1282                 spin_unlock_irq(&runtime->lock);
1283                 count1 = snd_rawmidi_kernel_write1(substream, buf, NULL, count);
1284                 if (count1 < 0)
1285                         return result > 0 ? result : count1;
1286                 result += count1;
1287                 buf += count1;
1288                 if ((size_t)count1 < count && (file->f_flags & O_NONBLOCK))
1289                         break;
1290                 count -= count1;
1291         }
1292         if (file->f_flags & O_DSYNC) {
1293                 spin_lock_irq(&runtime->lock);
1294                 while (runtime->avail != runtime->buffer_size) {
1295                         wait_queue_t wait;
1296                         unsigned int last_avail = runtime->avail;
1297                         init_waitqueue_entry(&wait, current);
1298                         add_wait_queue(&runtime->sleep, &wait);
1299                         set_current_state(TASK_INTERRUPTIBLE);
1300                         spin_unlock_irq(&runtime->lock);
1301                         timeout = schedule_timeout(30 * HZ);
1302                         remove_wait_queue(&runtime->sleep, &wait);
1303                         if (signal_pending(current))
1304                                 return result > 0 ? result : -ERESTARTSYS;
1305                         if (runtime->avail == last_avail && !timeout)
1306                                 return result > 0 ? result : -EIO;
1307                         spin_lock_irq(&runtime->lock);
1308                 }
1309                 spin_unlock_irq(&runtime->lock);
1310         }
1311         return result;
1312 }
1313
1314 static unsigned int snd_rawmidi_poll(struct file *file, poll_table * wait)
1315 {
1316         struct snd_rawmidi_file *rfile;
1317         struct snd_rawmidi_runtime *runtime;
1318         unsigned int mask;
1319
1320         rfile = file->private_data;
1321         if (rfile->input != NULL) {
1322                 runtime = rfile->input->runtime;
1323                 snd_rawmidi_input_trigger(rfile->input, 1);
1324                 poll_wait(file, &runtime->sleep, wait);
1325         }
1326         if (rfile->output != NULL) {
1327                 runtime = rfile->output->runtime;
1328                 poll_wait(file, &runtime->sleep, wait);
1329         }
1330         mask = 0;
1331         if (rfile->input != NULL) {
1332                 if (snd_rawmidi_ready(rfile->input))
1333                         mask |= POLLIN | POLLRDNORM;
1334         }
1335         if (rfile->output != NULL) {
1336                 if (snd_rawmidi_ready(rfile->output))
1337                         mask |= POLLOUT | POLLWRNORM;
1338         }
1339         return mask;
1340 }
1341
1342 /*
1343  */
1344 #ifdef CONFIG_COMPAT
1345 #include "rawmidi_compat.c"
1346 #else
1347 #define snd_rawmidi_ioctl_compat        NULL
1348 #endif
1349
1350 /*
1351
1352  */
1353
1354 static void snd_rawmidi_proc_info_read(struct snd_info_entry *entry,
1355                                        struct snd_info_buffer *buffer)
1356 {
1357         struct snd_rawmidi *rmidi;
1358         struct snd_rawmidi_substream *substream;
1359         struct snd_rawmidi_runtime *runtime;
1360
1361         rmidi = entry->private_data;
1362         snd_iprintf(buffer, "%s\n\n", rmidi->name);
1363         mutex_lock(&rmidi->open_mutex);
1364         if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_OUTPUT) {
1365                 list_for_each_entry(substream,
1366                                     &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams,
1367                                     list) {
1368                         snd_iprintf(buffer,
1369                                     "Output %d\n"
1370                                     "  Tx bytes     : %lu\n",
1371                                     substream->number,
1372                                     (unsigned long) substream->bytes);
1373                         if (substream->opened) {
1374                                 snd_iprintf(buffer,
1375                                     "  Owner PID    : %d\n",
1376                                     pid_vnr(substream->pid));
1377                                 runtime = substream->runtime;
1378                                 snd_iprintf(buffer,
1379                                     "  Mode         : %s\n"
1380                                     "  Buffer size  : %lu\n"
1381                                     "  Avail        : %lu\n",
1382                                     runtime->oss ? "OSS compatible" : "native",
1383                                     (unsigned long) runtime->buffer_size,
1384                                     (unsigned long) runtime->avail);
1385                         }
1386                 }
1387         }
1388         if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_INPUT) {
1389                 list_for_each_entry(substream,
1390                                     &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams,
1391                                     list) {
1392                         snd_iprintf(buffer,
1393                                     "Input %d\n"
1394                                     "  Rx bytes     : %lu\n",
1395                                     substream->number,
1396                                     (unsigned long) substream->bytes);
1397                         if (substream->opened) {
1398                                 snd_iprintf(buffer,
1399                                             "  Owner PID    : %d\n",
1400                                             pid_vnr(substream->pid));
1401                                 runtime = substream->runtime;
1402                                 snd_iprintf(buffer,
1403                                             "  Buffer size  : %lu\n"
1404                                             "  Avail        : %lu\n"
1405                                             "  Overruns     : %lu\n",
1406                                             (unsigned long) runtime->buffer_size,
1407                                             (unsigned long) runtime->avail,
1408                                             (unsigned long) runtime->xruns);
1409                         }
1410                 }
1411         }
1412         mutex_unlock(&rmidi->open_mutex);
1413 }
1414
1415 /*
1416  *  Register functions
1417  */
1418
1419 static const struct file_operations snd_rawmidi_f_ops =
1420 {
1421         .owner =        THIS_MODULE,
1422         .read =         snd_rawmidi_read,
1423         .write =        snd_rawmidi_write,
1424         .open =         snd_rawmidi_open,
1425         .release =      snd_rawmidi_release,
1426         .llseek =       no_llseek,
1427         .poll =         snd_rawmidi_poll,
1428         .unlocked_ioctl =       snd_rawmidi_ioctl,
1429         .compat_ioctl = snd_rawmidi_ioctl_compat,
1430 };
1431
1432 static int snd_rawmidi_alloc_substreams(struct snd_rawmidi *rmidi,
1433                                         struct snd_rawmidi_str *stream,
1434                                         int direction,
1435                                         int count)
1436 {
1437         struct snd_rawmidi_substream *substream;
1438         int idx;
1439
1440         for (idx = 0; idx < count; idx++) {
1441                 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
1442                 if (substream == NULL) {
1443                         rmidi_err(rmidi, "rawmidi: cannot allocate substream\n");
1444                         return -ENOMEM;
1445                 }
1446                 substream->stream = direction;
1447                 substream->number = idx;
1448                 substream->rmidi = rmidi;
1449                 substream->pstr = stream;
1450                 list_add_tail(&substream->list, &stream->substreams);
1451                 stream->substream_count++;
1452         }
1453         return 0;
1454 }
1455
1456 /**
1457  * snd_rawmidi_new - create a rawmidi instance
1458  * @card: the card instance
1459  * @id: the id string
1460  * @device: the device index
1461  * @output_count: the number of output streams
1462  * @input_count: the number of input streams
1463  * @rrawmidi: the pointer to store the new rawmidi instance
1464  *
1465  * Creates a new rawmidi instance.
1466  * Use snd_rawmidi_set_ops() to set the operators to the new instance.
1467  *
1468  * Return: Zero if successful, or a negative error code on failure.
1469  */
1470 int snd_rawmidi_new(struct snd_card *card, char *id, int device,
1471                     int output_count, int input_count,
1472                     struct snd_rawmidi ** rrawmidi)
1473 {
1474         struct snd_rawmidi *rmidi;
1475         int err;
1476         static struct snd_device_ops ops = {
1477                 .dev_free = snd_rawmidi_dev_free,
1478                 .dev_register = snd_rawmidi_dev_register,
1479                 .dev_disconnect = snd_rawmidi_dev_disconnect,
1480         };
1481
1482         if (snd_BUG_ON(!card))
1483                 return -ENXIO;
1484         if (rrawmidi)
1485                 *rrawmidi = NULL;
1486         rmidi = kzalloc(sizeof(*rmidi), GFP_KERNEL);
1487         if (rmidi == NULL) {
1488                 dev_err(card->dev, "rawmidi: cannot allocate\n");
1489                 return -ENOMEM;
1490         }
1491         rmidi->card = card;
1492         rmidi->device = device;
1493         mutex_init(&rmidi->open_mutex);
1494         init_waitqueue_head(&rmidi->open_wait);
1495         INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams);
1496         INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams);
1497
1498         if (id != NULL)
1499                 strlcpy(rmidi->id, id, sizeof(rmidi->id));
1500         if ((err = snd_rawmidi_alloc_substreams(rmidi,
1501                                                 &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT],
1502                                                 SNDRV_RAWMIDI_STREAM_INPUT,
1503                                                 input_count)) < 0) {
1504                 snd_rawmidi_free(rmidi);
1505                 return err;
1506         }
1507         if ((err = snd_rawmidi_alloc_substreams(rmidi,
1508                                                 &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT],
1509                                                 SNDRV_RAWMIDI_STREAM_OUTPUT,
1510                                                 output_count)) < 0) {
1511                 snd_rawmidi_free(rmidi);
1512                 return err;
1513         }
1514         if ((err = snd_device_new(card, SNDRV_DEV_RAWMIDI, rmidi, &ops)) < 0) {
1515                 snd_rawmidi_free(rmidi);
1516                 return err;
1517         }
1518         if (rrawmidi)
1519                 *rrawmidi = rmidi;
1520         return 0;
1521 }
1522 EXPORT_SYMBOL(snd_rawmidi_new);
1523
1524 static void snd_rawmidi_free_substreams(struct snd_rawmidi_str *stream)
1525 {
1526         struct snd_rawmidi_substream *substream;
1527
1528         while (!list_empty(&stream->substreams)) {
1529                 substream = list_entry(stream->substreams.next, struct snd_rawmidi_substream, list);
1530                 list_del(&substream->list);
1531                 kfree(substream);
1532         }
1533 }
1534
1535 static int snd_rawmidi_free(struct snd_rawmidi *rmidi)
1536 {
1537         if (!rmidi)
1538                 return 0;
1539
1540         snd_info_free_entry(rmidi->proc_entry);
1541         rmidi->proc_entry = NULL;
1542         mutex_lock(&register_mutex);
1543         if (rmidi->ops && rmidi->ops->dev_unregister)
1544                 rmidi->ops->dev_unregister(rmidi);
1545         mutex_unlock(&register_mutex);
1546
1547         snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT]);
1548         snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT]);
1549         if (rmidi->private_free)
1550                 rmidi->private_free(rmidi);
1551         kfree(rmidi);
1552         return 0;
1553 }
1554
1555 static int snd_rawmidi_dev_free(struct snd_device *device)
1556 {
1557         struct snd_rawmidi *rmidi = device->device_data;
1558         return snd_rawmidi_free(rmidi);
1559 }
1560
1561 #if defined(CONFIG_SND_SEQUENCER) || (defined(MODULE) && defined(CONFIG_SND_SEQUENCER_MODULE))
1562 static void snd_rawmidi_dev_seq_free(struct snd_seq_device *device)
1563 {
1564         struct snd_rawmidi *rmidi = device->private_data;
1565         rmidi->seq_dev = NULL;
1566 }
1567 #endif
1568
1569 static int snd_rawmidi_dev_register(struct snd_device *device)
1570 {
1571         int err;
1572         struct snd_info_entry *entry;
1573         char name[16];
1574         struct snd_rawmidi *rmidi = device->device_data;
1575
1576         if (rmidi->device >= SNDRV_RAWMIDI_DEVICES)
1577                 return -ENOMEM;
1578         mutex_lock(&register_mutex);
1579         if (snd_rawmidi_search(rmidi->card, rmidi->device)) {
1580                 mutex_unlock(&register_mutex);
1581                 return -EBUSY;
1582         }
1583         list_add_tail(&rmidi->list, &snd_rawmidi_devices);
1584         sprintf(name, "midiC%iD%i", rmidi->card->number, rmidi->device);
1585         if ((err = snd_register_device(SNDRV_DEVICE_TYPE_RAWMIDI,
1586                                        rmidi->card, rmidi->device,
1587                                        &snd_rawmidi_f_ops, rmidi, name)) < 0) {
1588                 rmidi_err(rmidi, "unable to register rawmidi device %i:%i\n",
1589                           rmidi->card->number, rmidi->device);
1590                 list_del(&rmidi->list);
1591                 mutex_unlock(&register_mutex);
1592                 return err;
1593         }
1594         if (rmidi->ops && rmidi->ops->dev_register &&
1595             (err = rmidi->ops->dev_register(rmidi)) < 0) {
1596                 snd_unregister_device(SNDRV_DEVICE_TYPE_RAWMIDI, rmidi->card, rmidi->device);
1597                 list_del(&rmidi->list);
1598                 mutex_unlock(&register_mutex);
1599                 return err;
1600         }
1601 #ifdef CONFIG_SND_OSSEMUL
1602         rmidi->ossreg = 0;
1603         if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1604                 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1605                                             rmidi->card, 0, &snd_rawmidi_f_ops,
1606                                             rmidi) < 0) {
1607                         rmidi_err(rmidi,
1608                                   "unable to register OSS rawmidi device %i:%i\n",
1609                                   rmidi->card->number, 0);
1610                 } else {
1611                         rmidi->ossreg++;
1612 #ifdef SNDRV_OSS_INFO_DEV_MIDI
1613                         snd_oss_info_register(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number, rmidi->name);
1614 #endif
1615                 }
1616         }
1617         if ((int)rmidi->device == amidi_map[rmidi->card->number]) {
1618                 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1619                                             rmidi->card, 1, &snd_rawmidi_f_ops,
1620                                             rmidi) < 0) {
1621                         rmidi_err(rmidi,
1622                                   "unable to register OSS rawmidi device %i:%i\n",
1623                                   rmidi->card->number, 1);
1624                 } else {
1625                         rmidi->ossreg++;
1626                 }
1627         }
1628 #endif /* CONFIG_SND_OSSEMUL */
1629         mutex_unlock(&register_mutex);
1630         sprintf(name, "midi%d", rmidi->device);
1631         entry = snd_info_create_card_entry(rmidi->card, name, rmidi->card->proc_root);
1632         if (entry) {
1633                 entry->private_data = rmidi;
1634                 entry->c.text.read = snd_rawmidi_proc_info_read;
1635                 if (snd_info_register(entry) < 0) {
1636                         snd_info_free_entry(entry);
1637                         entry = NULL;
1638                 }
1639         }
1640         rmidi->proc_entry = entry;
1641 #if defined(CONFIG_SND_SEQUENCER) || (defined(MODULE) && defined(CONFIG_SND_SEQUENCER_MODULE))
1642         if (!rmidi->ops || !rmidi->ops->dev_register) { /* own registration mechanism */
1643                 if (snd_seq_device_new(rmidi->card, rmidi->device, SNDRV_SEQ_DEV_ID_MIDISYNTH, 0, &rmidi->seq_dev) >= 0) {
1644                         rmidi->seq_dev->private_data = rmidi;
1645                         rmidi->seq_dev->private_free = snd_rawmidi_dev_seq_free;
1646                         sprintf(rmidi->seq_dev->name, "MIDI %d-%d", rmidi->card->number, rmidi->device);
1647                         snd_device_register(rmidi->card, rmidi->seq_dev);
1648                 }
1649         }
1650 #endif
1651         return 0;
1652 }
1653
1654 static int snd_rawmidi_dev_disconnect(struct snd_device *device)
1655 {
1656         struct snd_rawmidi *rmidi = device->device_data;
1657         int dir;
1658
1659         mutex_lock(&register_mutex);
1660         mutex_lock(&rmidi->open_mutex);
1661         wake_up(&rmidi->open_wait);
1662         list_del_init(&rmidi->list);
1663         for (dir = 0; dir < 2; dir++) {
1664                 struct snd_rawmidi_substream *s;
1665                 list_for_each_entry(s, &rmidi->streams[dir].substreams, list) {
1666                         if (s->runtime)
1667                                 wake_up(&s->runtime->sleep);
1668                 }
1669         }
1670
1671 #ifdef CONFIG_SND_OSSEMUL
1672         if (rmidi->ossreg) {
1673                 if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1674                         snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 0);
1675 #ifdef SNDRV_OSS_INFO_DEV_MIDI
1676                         snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number);
1677 #endif
1678                 }
1679                 if ((int)rmidi->device == amidi_map[rmidi->card->number])
1680                         snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 1);
1681                 rmidi->ossreg = 0;
1682         }
1683 #endif /* CONFIG_SND_OSSEMUL */
1684         snd_unregister_device(SNDRV_DEVICE_TYPE_RAWMIDI, rmidi->card, rmidi->device);
1685         mutex_unlock(&rmidi->open_mutex);
1686         mutex_unlock(&register_mutex);
1687         return 0;
1688 }
1689
1690 /**
1691  * snd_rawmidi_set_ops - set the rawmidi operators
1692  * @rmidi: the rawmidi instance
1693  * @stream: the stream direction, SNDRV_RAWMIDI_STREAM_XXX
1694  * @ops: the operator table
1695  *
1696  * Sets the rawmidi operators for the given stream direction.
1697  */
1698 void snd_rawmidi_set_ops(struct snd_rawmidi *rmidi, int stream,
1699                          struct snd_rawmidi_ops *ops)
1700 {
1701         struct snd_rawmidi_substream *substream;
1702
1703         list_for_each_entry(substream, &rmidi->streams[stream].substreams, list)
1704                 substream->ops = ops;
1705 }
1706 EXPORT_SYMBOL(snd_rawmidi_set_ops);
1707
1708 /*
1709  *  ENTRY functions
1710  */
1711
1712 static int __init alsa_rawmidi_init(void)
1713 {
1714
1715         snd_ctl_register_ioctl(snd_rawmidi_control_ioctl);
1716         snd_ctl_register_ioctl_compat(snd_rawmidi_control_ioctl);
1717 #ifdef CONFIG_SND_OSSEMUL
1718         { int i;
1719         /* check device map table */
1720         for (i = 0; i < SNDRV_CARDS; i++) {
1721                 if (midi_map[i] < 0 || midi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1722                         pr_err("ALSA: rawmidi: invalid midi_map[%d] = %d\n",
1723                                i, midi_map[i]);
1724                         midi_map[i] = 0;
1725                 }
1726                 if (amidi_map[i] < 0 || amidi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1727                         pr_err("ALSA: rawmidi: invalid amidi_map[%d] = %d\n",
1728                                i, amidi_map[i]);
1729                         amidi_map[i] = 1;
1730                 }
1731         }
1732         }
1733 #endif /* CONFIG_SND_OSSEMUL */
1734         return 0;
1735 }
1736
1737 static void __exit alsa_rawmidi_exit(void)
1738 {
1739         snd_ctl_unregister_ioctl(snd_rawmidi_control_ioctl);
1740         snd_ctl_unregister_ioctl_compat(snd_rawmidi_control_ioctl);
1741 }
1742
1743 module_init(alsa_rawmidi_init)
1744 module_exit(alsa_rawmidi_exit)