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
 176 int snd_rawmidi_drain_output(struct snd_rawmidi_substream *substream)
 177 {
 178         int err;
 179         long timeout;
 180         struct snd_rawmidi_runtime *runtime = substream->runtime;
 181
 182         err = 0;
 183         runtime->drain = 1;
 184         timeout = wait_event_interruptible_timeout(runtime->sleep,
 185                                 (runtime->avail >= runtime->buffer_size),
 186                                 10*HZ);
 187         if (signal_pending(current))
 188                 err = -ERESTARTSYS;
 189         if (runtime->avail < runtime->buffer_size && !timeout) {
 190                 rmidi_warn(substream->rmidi,
 191                            "rawmidi drain error (avail = %li, buffer_size = %li)\n",
 192                            (long)runtime->avail, (long)runtime->buffer_size);
 193                 err = -EIO;
 194         }
 195         runtime->drain = 0;
 196         if (err != -ERESTARTSYS) {
 197                 /* we need wait a while to make sure that Tx FIFOs are empty */
 198                 if (substream->ops->drain)
 199                         substream->ops->drain(substream);
 200                 else
 201                         msleep(50);
 202                 snd_rawmidi_drop_output(substream);
 203         }
 204         return err;
 205 }
 206
 207 int snd_rawmidi_drain_input(struct snd_rawmidi_substream *substream)
 208 {
 209         unsigned long flags;
 210         struct snd_rawmidi_runtime *runtime = substream->runtime;
 211
 212         snd_rawmidi_input_trigger(substream, 0);
 213         runtime->drain = 0;
 214         spin_lock_irqsave(&runtime->lock, flags);
 215         runtime->appl_ptr = runtime->hw_ptr = 0;
 216         runtime->avail = 0;
 217         spin_unlock_irqrestore(&runtime->lock, flags);
 218         return 0;
 219 }
 220
 221 /* look for an available substream for the given stream direction;
 222  * if a specific subdevice is given, try to assign it
 223  */
 224 static int assign_substream(struct snd_rawmidi *rmidi, int subdevice,
 225                             int stream, int mode,
 226                             struct snd_rawmidi_substream **sub_ret)
 227 {
 228         struct snd_rawmidi_substream *substream;
 229         struct snd_rawmidi_str *s = &rmidi->streams[stream];
 230         static unsigned int info_flags[2] = {
 231                 [SNDRV_RAWMIDI_STREAM_OUTPUT] = SNDRV_RAWMIDI_INFO_OUTPUT,
 232                 [SNDRV_RAWMIDI_STREAM_INPUT] = SNDRV_RAWMIDI_INFO_INPUT,
 233         };
 234
 235         if (!(rmidi->info_flags & info_flags[stream]))
 236                 return -ENXIO;
 237         if (subdevice >= 0 && subdevice >= s->substream_count)
 238                 return -ENODEV;
 239
 240         list_for_each_entry(substream, &s->substreams, list) {
 241                 if (substream->opened) {
 242                         if (stream == SNDRV_RAWMIDI_STREAM_INPUT ||
 243                             !(mode & SNDRV_RAWMIDI_LFLG_APPEND) ||
 244                             !substream->append)
 245                                 continue;
 246                 }
 247                 if (subdevice < 0 || subdevice == substream->number) {
 248                         *sub_ret = substream;
 249                         return 0;
 250                 }
 251         }
 252         return -EAGAIN;
 253 }
 254
 255 /* open and do ref-counting for the given substream */
 256 static int open_substream(struct snd_rawmidi *rmidi,
 257                           struct snd_rawmidi_substream *substream,
 258                           int mode)
 259 {
 260         int err;
 261
 262         if (substream->use_count == 0) {
 263                 err = snd_rawmidi_runtime_create(substream);
 264                 if (err < 0)
 265                         return err;
 266                 err = substream->ops->open(substream);
 267                 if (err < 0) {
 268                         snd_rawmidi_runtime_free(substream);
 269                         return err;
 270                 }
 271                 substream->opened = 1;
 272                 substream->active_sensing = 0;
 273                 if (mode & SNDRV_RAWMIDI_LFLG_APPEND)
 274                         substream->append = 1;
 275                 substream->pid = get_pid(task_pid(current));
 276                 rmidi->streams[substream->stream].substream_opened++;
 277         }
 278         substream->use_count++;
 279         return 0;
 280 }
 281
 282 static void close_substream(struct snd_rawmidi *rmidi,
 283                             struct snd_rawmidi_substream *substream,
 284                             int cleanup);
 285
 286 static int rawmidi_open_priv(struct snd_rawmidi *rmidi, int subdevice, int mode,
 287                              struct snd_rawmidi_file *rfile)
 288 {
 289         struct snd_rawmidi_substream *sinput = NULL, *soutput = NULL;
 290         int err;
 291
 292         rfile->input = rfile->output = NULL;
 293         if (mode & SNDRV_RAWMIDI_LFLG_INPUT) {
 294                 err = assign_substream(rmidi, subdevice,
 295                                        SNDRV_RAWMIDI_STREAM_INPUT,
 296                                        mode, &sinput);
 297                 if (err < 0)
 298                         return err;
 299         }
 300         if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) {
 301                 err = assign_substream(rmidi, subdevice,
 302                                        SNDRV_RAWMIDI_STREAM_OUTPUT,
 303                                        mode, &soutput);
 304                 if (err < 0)
 305                         return err;
 306         }
 307
 308         if (sinput) {
 309                 err = open_substream(rmidi, sinput, mode);
 310                 if (err < 0)
 311                         return err;
 312         }
 313         if (soutput) {
 314                 err = open_substream(rmidi, soutput, mode);
 315                 if (err < 0) {
 316                         if (sinput)
 317                                 close_substream(rmidi, sinput, 0);
 318                         return err;
 319                 }
 320         }
 321
 322         rfile->rmidi = rmidi;
 323         rfile->input = sinput;
 324         rfile->output = soutput;
 325         return 0;
 326 }
 327
 328 /* called from sound/core/seq/seq_midi.c */
 329 int snd_rawmidi_kernel_open(struct snd_card *card, int device, int subdevice,
 330                             int mode, struct snd_rawmidi_file * rfile)
 331 {
 332         struct snd_rawmidi *rmidi;
 333         int err;
 334
 335         if (snd_BUG_ON(!rfile))
 336                 return -EINVAL;
 337
 338         mutex_lock(&register_mutex);
 339         rmidi = snd_rawmidi_search(card, device);
 340         if (rmidi == NULL) {
 341                 mutex_unlock(&register_mutex);
 342                 return -ENODEV;
 343         }
 344         if (!try_module_get(rmidi->card->module)) {
 345                 mutex_unlock(&register_mutex);
 346                 return -ENXIO;
 347         }
 348         mutex_unlock(&register_mutex);
 349
 350         mutex_lock(&rmidi->open_mutex);
 351         err = rawmidi_open_priv(rmidi, subdevice, mode, rfile);
 352         mutex_unlock(&rmidi->open_mutex);
 353         if (err < 0)
 354                 module_put(rmidi->card->module);
 355         return err;
 356 }
 357
 358 static int snd_rawmidi_open(struct inode *inode, struct file *file)
 359 {
 360         int maj = imajor(inode);
 361         struct snd_card *card;
 362         int subdevice;
 363         unsigned short fflags;
 364         int err;
 365         struct snd_rawmidi *rmidi;
 366         struct snd_rawmidi_file *rawmidi_file = NULL;
 367         wait_queue_t wait;
 368         struct snd_ctl_file *kctl;
 369
 370         if ((file->f_flags & O_APPEND) && !(file->f_flags & O_NONBLOCK))
 371                 return -EINVAL;         /* invalid combination */
 372
 373         err = nonseekable_open(inode, file);
 374         if (err < 0)
 375                 return err;
 376
 377         if (maj == snd_major) {
 378                 rmidi = snd_lookup_minor_data(iminor(inode),
 379                                               SNDRV_DEVICE_TYPE_RAWMIDI);
 380 #ifdef CONFIG_SND_OSSEMUL
 381         } else if (maj == SOUND_MAJOR) {
 382                 rmidi = snd_lookup_oss_minor_data(iminor(inode),
 383                                                   SNDRV_OSS_DEVICE_TYPE_MIDI);
 384 #endif
 385         } else
 386                 return -ENXIO;
 387
 388         if (rmidi == NULL)
 389                 return -ENODEV;
 390
 391         if (!try_module_get(rmidi->card->module)) {
 392                 snd_card_unref(rmidi->card);
 393                 return -ENXIO;
 394         }
 395
 396         mutex_lock(&rmidi->open_mutex);
 397         card = rmidi->card;
 398         err = snd_card_file_add(card, file);
 399         if (err < 0)
 400                 goto __error_card;
 401         fflags = snd_rawmidi_file_flags(file);
 402         if ((file->f_flags & O_APPEND) || maj == SOUND_MAJOR) /* OSS emul? */
 403                 fflags |= SNDRV_RAWMIDI_LFLG_APPEND;
 404         rawmidi_file = kmalloc(sizeof(*rawmidi_file), GFP_KERNEL);
 405         if (rawmidi_file == NULL) {
 406                 err = -ENOMEM;
 407                 goto __error;
 408         }
 409         init_waitqueue_entry(&wait, current);
 410         add_wait_queue(&rmidi->open_wait, &wait);
 411         while (1) {
 412                 subdevice = -1;
 413                 read_lock(&card->ctl_files_rwlock);
 414                 list_for_each_entry(kctl, &card->ctl_files, list) {
 415                         if (kctl->pid == task_pid(current)) {
 416                                 subdevice = kctl->prefer_rawmidi_subdevice;
 417                                 if (subdevice != -1)
 418                                         break;
 419                         }
 420                 }
 421                 read_unlock(&card->ctl_files_rwlock);
 422                 err = rawmidi_open_priv(rmidi, subdevice, fflags, rawmidi_file);
 423                 if (err >= 0)
 424                         break;
 425                 if (err == -EAGAIN) {
 426                         if (file->f_flags & O_NONBLOCK) {
 427                                 err = -EBUSY;
 428                                 break;
 429                         }
 430                 } else
 431                         break;
 432                 set_current_state(TASK_INTERRUPTIBLE);
 433                 mutex_unlock(&rmidi->open_mutex);
 434                 schedule();
 435                 mutex_lock(&rmidi->open_mutex);
 436                 if (rmidi->card->shutdown) {
 437                         err = -ENODEV;
 438                         break;
 439                 }
 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         snd_card_unref(rmidi->card);
 459         return 0;
 460
 461  __error:
 462         snd_card_file_remove(card, file);
 463  __error_card:
 464         mutex_unlock(&rmidi->open_mutex);
 465         module_put(rmidi->card->module);
 466         snd_card_unref(rmidi->card);
 467         return err;
 468 }
 469
 470 static void close_substream(struct snd_rawmidi *rmidi,
 471                             struct snd_rawmidi_substream *substream,
 472                             int cleanup)
 473 {
 474         if (--substream->use_count)
 475                 return;
 476
 477         if (cleanup) {
 478                 if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
 479                         snd_rawmidi_input_trigger(substream, 0);
 480                 else {
 481                         if (substream->active_sensing) {
 482                                 unsigned char buf = 0xfe;
 483                                 /* sending single active sensing message
 484                                  * to shut the device up
 485                                  */
 486                                 snd_rawmidi_kernel_write(substream, &buf, 1);
 487                         }
 488                         if (snd_rawmidi_drain_output(substream) == -ERESTARTSYS)
 489                                 snd_rawmidi_output_trigger(substream, 0);
 490                 }
 491         }
 492         substream->ops->close(substream);
 493         if (substream->runtime->private_free)
 494                 substream->runtime->private_free(substream);
 495         snd_rawmidi_runtime_free(substream);
 496         substream->opened = 0;
 497         substream->append = 0;
 498         put_pid(substream->pid);
 499         substream->pid = NULL;
 500         rmidi->streams[substream->stream].substream_opened--;
 501 }
 502
 503 static void rawmidi_release_priv(struct snd_rawmidi_file *rfile)
 504 {
 505         struct snd_rawmidi *rmidi;
 506
 507         rmidi = rfile->rmidi;
 508         mutex_lock(&rmidi->open_mutex);
 509         if (rfile->input) {
 510                 close_substream(rmidi, rfile->input, 1);
 511                 rfile->input = NULL;
 512         }
 513         if (rfile->output) {
 514                 close_substream(rmidi, rfile->output, 1);
 515                 rfile->output = NULL;
 516         }
 517         rfile->rmidi = NULL;
 518         mutex_unlock(&rmidi->open_mutex);
 519         wake_up(&rmidi->open_wait);
 520 }
 521
 522 /* called from sound/core/seq/seq_midi.c */
 523 int snd_rawmidi_kernel_release(struct snd_rawmidi_file *rfile)
 524 {
 525         struct snd_rawmidi *rmidi;
 526
 527         if (snd_BUG_ON(!rfile))
 528                 return -ENXIO;
 529
 530         rmidi = rfile->rmidi;
 531         rawmidi_release_priv(rfile);
 532         module_put(rmidi->card->module);
 533         return 0;
 534 }
 535
 536 static int snd_rawmidi_release(struct inode *inode, struct file *file)
 537 {
 538         struct snd_rawmidi_file *rfile;
 539         struct snd_rawmidi *rmidi;
 540         struct module *module;
 541
 542         rfile = file->private_data;
 543         rmidi = rfile->rmidi;
 544         rawmidi_release_priv(rfile);
 545         kfree(rfile);
 546         module = rmidi->card->module;
 547         snd_card_file_remove(rmidi->card, file);
 548         module_put(module);
 549         return 0;
 550 }
 551
 552 static int snd_rawmidi_info(struct snd_rawmidi_substream *substream,
 553                             struct snd_rawmidi_info *info)
 554 {
 555         struct snd_rawmidi *rmidi;
 556
 557         if (substream == NULL)
 558                 return -ENODEV;
 559         rmidi = substream->rmidi;
 560         memset(info, 0, sizeof(*info));
 561         info->card = rmidi->card->number;
 562         info->device = rmidi->device;
 563         info->subdevice = substream->number;
 564         info->stream = substream->stream;
 565         info->flags = rmidi->info_flags;
 566         strcpy(info->id, rmidi->id);
 567         strcpy(info->name, rmidi->name);
 568         strcpy(info->subname, substream->name);
 569         info->subdevices_count = substream->pstr->substream_count;
 570         info->subdevices_avail = (substream->pstr->substream_count -
 571                                   substream->pstr->substream_opened);
 572         return 0;
 573 }
 574
 575 static int snd_rawmidi_info_user(struct snd_rawmidi_substream *substream,
 576                                  struct snd_rawmidi_info __user * _info)
 577 {
 578         struct snd_rawmidi_info info;
 579         int err;
 580         if ((err = snd_rawmidi_info(substream, &info)) < 0)
 581                 return err;
 582         if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
 583                 return -EFAULT;
 584         return 0;
 585 }
 586
 587 int snd_rawmidi_info_select(struct snd_card *card, struct snd_rawmidi_info *info)
 588 {
 589         struct snd_rawmidi *rmidi;
 590         struct snd_rawmidi_str *pstr;
 591         struct snd_rawmidi_substream *substream;
 592
 593         mutex_lock(&register_mutex);
 594         rmidi = snd_rawmidi_search(card, info->device);
 595         mutex_unlock(&register_mutex);
 596         if (!rmidi)
 597                 return -ENXIO;
 598         if (info->stream < 0 || info->stream > 1)
 599                 return -EINVAL;
 600         pstr = &rmidi->streams[info->stream];
 601         if (pstr->substream_count == 0)
 602                 return -ENOENT;
 603         if (info->subdevice >= pstr->substream_count)
 604                 return -ENXIO;
 605         list_for_each_entry(substream, &pstr->substreams, list) {
 606                 if ((unsigned int)substream->number == info->subdevice)
 607                         return snd_rawmidi_info(substream, info);
 608         }
 609         return -ENXIO;
 610 }
 611
 612 static int snd_rawmidi_info_select_user(struct snd_card *card,
 613                                         struct snd_rawmidi_info __user *_info)
 614 {
 615         int err;
 616         struct snd_rawmidi_info info;
 617         if (get_user(info.device, &_info->device))
 618                 return -EFAULT;
 619         if (get_user(info.stream, &_info->stream))
 620                 return -EFAULT;
 621         if (get_user(info.subdevice, &_info->subdevice))
 622                 return -EFAULT;
 623         if ((err = snd_rawmidi_info_select(card, &info)) < 0)
 624                 return err;
 625         if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
 626                 return -EFAULT;
 627         return 0;
 628 }
 629
 630 int snd_rawmidi_output_params(struct snd_rawmidi_substream *substream,
 631                               struct snd_rawmidi_params * params)
 632 {
 633         char *newbuf;
 634         struct snd_rawmidi_runtime *runtime = substream->runtime;
 635
 636         if (substream->append && substream->use_count > 1)
 637                 return -EBUSY;
 638         snd_rawmidi_drain_output(substream);
 639         if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L) {
 640                 return -EINVAL;
 641         }
 642         if (params->avail_min < 1 || params->avail_min > params->buffer_size) {
 643                 return -EINVAL;
 644         }
 645         if (params->buffer_size != runtime->buffer_size) {
 646                 newbuf = krealloc(runtime->buffer, params->buffer_size,
 647                                   GFP_KERNEL);
 648                 if (!newbuf)
 649                         return -ENOMEM;
 650                 runtime->buffer = newbuf;
 651                 runtime->buffer_size = params->buffer_size;
 652                 runtime->avail = runtime->buffer_size;
 653         }
 654         runtime->avail_min = params->avail_min;
 655         substream->active_sensing = !params->no_active_sensing;
 656         return 0;
 657 }
 658
 659 int snd_rawmidi_input_params(struct snd_rawmidi_substream *substream,
 660                              struct snd_rawmidi_params * params)
 661 {
 662         char *newbuf;
 663         struct snd_rawmidi_runtime *runtime = substream->runtime;
 664
 665         snd_rawmidi_drain_input(substream);
 666         if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L) {
 667                 return -EINVAL;
 668         }
 669         if (params->avail_min < 1 || params->avail_min > params->buffer_size) {
 670                 return -EINVAL;
 671         }
 672         if (params->buffer_size != runtime->buffer_size) {
 673                 newbuf = krealloc(runtime->buffer, params->buffer_size,
 674                                   GFP_KERNEL);
 675                 if (!newbuf)
 676                         return -ENOMEM;
 677                 runtime->buffer = newbuf;
 678                 runtime->buffer_size = params->buffer_size;
 679         }
 680         runtime->avail_min = params->avail_min;
 681         return 0;
 682 }
 683
 684 static int snd_rawmidi_output_status(struct snd_rawmidi_substream *substream,
 685                                      struct snd_rawmidi_status * status)
 686 {
 687         struct snd_rawmidi_runtime *runtime = substream->runtime;
 688
 689         memset(status, 0, sizeof(*status));
 690         status->stream = SNDRV_RAWMIDI_STREAM_OUTPUT;
 691         spin_lock_irq(&runtime->lock);
 692         status->avail = runtime->avail;
 693         spin_unlock_irq(&runtime->lock);
 694         return 0;
 695 }
 696
 697 static int snd_rawmidi_input_status(struct snd_rawmidi_substream *substream,
 698                                     struct snd_rawmidi_status * status)
 699 {
 700         struct snd_rawmidi_runtime *runtime = substream->runtime;
 701
 702         memset(status, 0, sizeof(*status));
 703         status->stream = SNDRV_RAWMIDI_STREAM_INPUT;
 704         spin_lock_irq(&runtime->lock);
 705         status->avail = runtime->avail;
 706         status->xruns = runtime->xruns;
 707         runtime->xruns = 0;
 708         spin_unlock_irq(&runtime->lock);
 709         return 0;
 710 }
 711
 712 static long snd_rawmidi_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 713 {
 714         struct snd_rawmidi_file *rfile;
 715         void __user *argp = (void __user *)arg;
 716
 717         rfile = file->private_data;
 718         if (((cmd >> 8) & 0xff) != 'W')
 719                 return -ENOTTY;
 720         switch (cmd) {
 721         case SNDRV_RAWMIDI_IOCTL_PVERSION:
 722                 return put_user(SNDRV_RAWMIDI_VERSION, (int __user *)argp) ? -EFAULT : 0;
 723         case SNDRV_RAWMIDI_IOCTL_INFO:
 724         {
 725                 int stream;
 726                 struct snd_rawmidi_info __user *info = argp;
 727                 if (get_user(stream, &info->stream))
 728                         return -EFAULT;
 729                 switch (stream) {
 730                 case SNDRV_RAWMIDI_STREAM_INPUT:
 731                         return snd_rawmidi_info_user(rfile->input, info);
 732                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
 733                         return snd_rawmidi_info_user(rfile->output, info);
 734                 default:
 735                         return -EINVAL;
 736                 }
 737         }
 738         case SNDRV_RAWMIDI_IOCTL_PARAMS:
 739         {
 740                 struct snd_rawmidi_params params;
 741                 if (copy_from_user(&params, argp, sizeof(struct snd_rawmidi_params)))
 742                         return -EFAULT;
 743                 switch (params.stream) {
 744                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
 745                         if (rfile->output == NULL)
 746                                 return -EINVAL;
 747                         return snd_rawmidi_output_params(rfile->output, &params);
 748                 case SNDRV_RAWMIDI_STREAM_INPUT:
 749                         if (rfile->input == NULL)
 750                                 return -EINVAL;
 751                         return snd_rawmidi_input_params(rfile->input, &params);
 752                 default:
 753                         return -EINVAL;
 754                 }
 755         }
 756         case SNDRV_RAWMIDI_IOCTL_STATUS:
 757         {
 758                 int err = 0;
 759                 struct snd_rawmidi_status status;
 760                 if (copy_from_user(&status, argp, sizeof(struct snd_rawmidi_status)))
 761                         return -EFAULT;
 762                 switch (status.stream) {
 763                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
 764                         if (rfile->output == NULL)
 765                                 return -EINVAL;
 766                         err = snd_rawmidi_output_status(rfile->output, &status);
 767                         break;
 768                 case SNDRV_RAWMIDI_STREAM_INPUT:
 769                         if (rfile->input == NULL)
 770                                 return -EINVAL;
 771                         err = snd_rawmidi_input_status(rfile->input, &status);
 772                         break;
 773                 default:
 774                         return -EINVAL;
 775                 }
 776                 if (err < 0)
 777                         return err;
 778                 if (copy_to_user(argp, &status, sizeof(struct snd_rawmidi_status)))
 779                         return -EFAULT;
 780                 return 0;
 781         }
 782         case SNDRV_RAWMIDI_IOCTL_DROP:
 783         {
 784                 int val;
 785                 if (get_user(val, (int __user *) argp))
 786                         return -EFAULT;
 787                 switch (val) {
 788                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
 789                         if (rfile->output == NULL)
 790                                 return -EINVAL;
 791                         return snd_rawmidi_drop_output(rfile->output);
 792                 default:
 793                         return -EINVAL;
 794                 }
 795         }
 796         case SNDRV_RAWMIDI_IOCTL_DRAIN:
 797         {
 798                 int val;
 799                 if (get_user(val, (int __user *) argp))
 800                         return -EFAULT;
 801                 switch (val) {
 802                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
 803                         if (rfile->output == NULL)
 804                                 return -EINVAL;
 805                         return snd_rawmidi_drain_output(rfile->output);
 806                 case SNDRV_RAWMIDI_STREAM_INPUT:
 807                         if (rfile->input == NULL)
 808                                 return -EINVAL;
 809                         return snd_rawmidi_drain_input(rfile->input);
 810                 default:
 811                         return -EINVAL;
 812                 }
 813         }
 814         default:
 815                 rmidi_dbg(rfile->rmidi,
 816                           "rawmidi: unknown command = 0x%x\n", cmd);
 817         }
 818         return -ENOTTY;
 819 }
 820
 821 static int snd_rawmidi_control_ioctl(struct snd_card *card,
 822                                      struct snd_ctl_file *control,
 823                                      unsigned int cmd,
 824                                      unsigned long arg)
 825 {
 826         void __user *argp = (void __user *)arg;
 827
 828         switch (cmd) {
 829         case SNDRV_CTL_IOCTL_RAWMIDI_NEXT_DEVICE:
 830         {
 831                 int device;
 832
 833                 if (get_user(device, (int __user *)argp))
 834                         return -EFAULT;
 835                 if (device >= SNDRV_RAWMIDI_DEVICES) /* next device is -1 */
 836                         device = SNDRV_RAWMIDI_DEVICES - 1;
 837                 mutex_lock(&register_mutex);
 838                 device = device < 0 ? 0 : device + 1;
 839                 while (device < SNDRV_RAWMIDI_DEVICES) {
 840                         if (snd_rawmidi_search(card, device))
 841                                 break;
 842                         device++;
 843                 }
 844                 if (device == SNDRV_RAWMIDI_DEVICES)
 845                         device = -1;
 846                 mutex_unlock(&register_mutex);
 847                 if (put_user(device, (int __user *)argp))
 848                         return -EFAULT;
 849                 return 0;
 850         }
 851         case SNDRV_CTL_IOCTL_RAWMIDI_PREFER_SUBDEVICE:
 852         {
 853                 int val;
 854
 855                 if (get_user(val, (int __user *)argp))
 856                         return -EFAULT;
 857                 control->prefer_rawmidi_subdevice = val;
 858                 return 0;
 859         }
 860         case SNDRV_CTL_IOCTL_RAWMIDI_INFO:
 861                 return snd_rawmidi_info_select_user(card, argp);
 862         }
 863         return -ENOIOCTLCMD;
 864 }
 865
 866 /**
 867  * snd_rawmidi_receive - receive the input data from the device
 868  * @substream: the rawmidi substream
 869  * @buffer: the buffer pointer
 870  * @count: the data size to read
 871  *
 872  * Reads the data from the internal buffer.
 873  *
 874  * Return: The size of read data, or a negative error code on failure.
 875  */
 876 int snd_rawmidi_receive(struct snd_rawmidi_substream *substream,
 877                         const unsigned char *buffer, int count)
 878 {
 879         unsigned long flags;
 880         int result = 0, count1;
 881         struct snd_rawmidi_runtime *runtime = substream->runtime;
 882
 883         if (!substream->opened)
 884                 return -EBADFD;
 885         if (runtime->buffer == NULL) {
 886                 rmidi_dbg(substream->rmidi,
 887                           "snd_rawmidi_receive: input is not active!!!\n");
 888                 return -EINVAL;
 889         }
 890         spin_lock_irqsave(&runtime->lock, flags);
 891         if (count == 1) {       /* special case, faster code */
 892                 substream->bytes++;
 893                 if (runtime->avail < runtime->buffer_size) {
 894                         runtime->buffer[runtime->hw_ptr++] = buffer[0];
 895                         runtime->hw_ptr %= runtime->buffer_size;
 896                         runtime->avail++;
 897                         result++;
 898                 } else {
 899                         runtime->xruns++;
 900                 }
 901         } else {
 902                 substream->bytes += count;
 903                 count1 = runtime->buffer_size - runtime->hw_ptr;
 904                 if (count1 > count)
 905                         count1 = count;
 906                 if (count1 > (int)(runtime->buffer_size - runtime->avail))
 907                         count1 = runtime->buffer_size - runtime->avail;
 908                 memcpy(runtime->buffer + runtime->hw_ptr, buffer, count1);
 909                 runtime->hw_ptr += count1;
 910                 runtime->hw_ptr %= runtime->buffer_size;
 911                 runtime->avail += count1;
 912                 count -= count1;
 913                 result += count1;
 914                 if (count > 0) {
 915                         buffer += count1;
 916                         count1 = count;
 917                         if (count1 > (int)(runtime->buffer_size - runtime->avail)) {
 918                                 count1 = runtime->buffer_size - runtime->avail;
 919                                 runtime->xruns += count - count1;
 920                         }
 921                         if (count1 > 0) {
 922                                 memcpy(runtime->buffer, buffer, count1);
 923                                 runtime->hw_ptr = count1;
 924                                 runtime->avail += count1;
 925                                 result += count1;
 926                         }
 927                 }
 928         }
 929         if (result > 0) {
 930                 if (runtime->event)
 931                         schedule_work(&runtime->event_work);
 932                 else if (snd_rawmidi_ready(substream))
 933                         wake_up(&runtime->sleep);
 934         }
 935         spin_unlock_irqrestore(&runtime->lock, flags);
 936         return result;
 937 }
 938
 939 static long snd_rawmidi_kernel_read1(struct snd_rawmidi_substream *substream,
 940                                      unsigned char __user *userbuf,
 941                                      unsigned char *kernelbuf, long count)
 942 {
 943         unsigned long flags;
 944         long result = 0, count1;
 945         struct snd_rawmidi_runtime *runtime = substream->runtime;
 946
 947         while (count > 0 && runtime->avail) {
 948                 count1 = runtime->buffer_size - runtime->appl_ptr;
 949                 if (count1 > count)
 950                         count1 = count;
 951                 spin_lock_irqsave(&runtime->lock, flags);
 952                 if (count1 > (int)runtime->avail)
 953                         count1 = runtime->avail;
 954                 if (kernelbuf)
 955                         memcpy(kernelbuf + result, runtime->buffer + runtime->appl_ptr, count1);
 956                 if (userbuf) {
 957                         spin_unlock_irqrestore(&runtime->lock, flags);
 958                         if (copy_to_user(userbuf + result,
 959                                          runtime->buffer + runtime->appl_ptr, count1)) {
 960                                 return result > 0 ? result : -EFAULT;
 961                         }
 962                         spin_lock_irqsave(&runtime->lock, flags);
 963                 }
 964                 runtime->appl_ptr += count1;
 965                 runtime->appl_ptr %= runtime->buffer_size;
 966                 runtime->avail -= count1;
 967                 spin_unlock_irqrestore(&runtime->lock, flags);
 968                 result += count1;
 969                 count -= count1;
 970         }
 971         return result;
 972 }
 973
 974 long snd_rawmidi_kernel_read(struct snd_rawmidi_substream *substream,
 975                              unsigned char *buf, long count)
 976 {
 977         snd_rawmidi_input_trigger(substream, 1);
 978         return snd_rawmidi_kernel_read1(substream, NULL/*userbuf*/, buf, count);
 979 }
 980
 981 static ssize_t snd_rawmidi_read(struct file *file, char __user *buf, size_t count,
 982                                 loff_t *offset)
 983 {
 984         long result;
 985         int count1;
 986         struct snd_rawmidi_file *rfile;
 987         struct snd_rawmidi_substream *substream;
 988         struct snd_rawmidi_runtime *runtime;
 989
 990         rfile = file->private_data;
 991         substream = rfile->input;
 992         if (substream == NULL)
 993                 return -EIO;
 994         runtime = substream->runtime;
 995         snd_rawmidi_input_trigger(substream, 1);
 996         result = 0;
 997         while (count > 0) {
 998                 spin_lock_irq(&runtime->lock);
 999                 while (!snd_rawmidi_ready(substream)) {
1000                         wait_queue_t wait;
1001                         if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1002                                 spin_unlock_irq(&runtime->lock);
1003                                 return result > 0 ? result : -EAGAIN;
1004                         }
1005                         init_waitqueue_entry(&wait, current);
1006                         add_wait_queue(&runtime->sleep, &wait);
1007                         set_current_state(TASK_INTERRUPTIBLE);
1008                         spin_unlock_irq(&runtime->lock);
1009                         schedule();
1010                         remove_wait_queue(&runtime->sleep, &wait);
1011                         if (rfile->rmidi->card->shutdown)
1012                                 return -ENODEV;
1013                         if (signal_pending(current))
1014                                 return result > 0 ? result : -ERESTARTSYS;
1015                         if (!runtime->avail)
1016                                 return result > 0 ? result : -EIO;
1017                         spin_lock_irq(&runtime->lock);
1018                 }
1019                 spin_unlock_irq(&runtime->lock);
1020                 count1 = snd_rawmidi_kernel_read1(substream,
1021                                                   (unsigned char __user *)buf,
1022                                                   NULL/*kernelbuf*/,
1023                                                   count);
1024                 if (count1 < 0)
1025                         return result > 0 ? result : count1;
1026                 result += count1;
1027                 buf += count1;
1028                 count -= count1;
1029         }
1030         return result;
1031 }
1032
1033 /**
1034  * snd_rawmidi_transmit_empty - check whether the output buffer is empty
1035  * @substream: the rawmidi substream
1036  *
1037  * Return: 1 if the internal output buffer is empty, 0 if not.
1038  */
1039 int snd_rawmidi_transmit_empty(struct snd_rawmidi_substream *substream)
1040 {
1041         struct snd_rawmidi_runtime *runtime = substream->runtime;
1042         int result;
1043         unsigned long flags;
1044
1045         if (runtime->buffer == NULL) {
1046                 rmidi_dbg(substream->rmidi,
1047                           "snd_rawmidi_transmit_empty: output is not active!!!\n");
1048                 return 1;
1049         }
1050         spin_lock_irqsave(&runtime->lock, flags);
1051         result = runtime->avail >= runtime->buffer_size;
1052         spin_unlock_irqrestore(&runtime->lock, flags);
1053         return result;
1054 }
1055
1056 /**
1057  * snd_rawmidi_transmit_peek - copy data from the internal buffer
1058  * @substream: the rawmidi substream
1059  * @buffer: the buffer pointer
1060  * @count: data size to transfer
1061  *
1062  * Copies data from the internal output buffer to the given buffer.
1063  *
1064  * Call this in the interrupt handler when the midi output is ready,
1065  * and call snd_rawmidi_transmit_ack() after the transmission is
1066  * finished.
1067  *
1068  * Return: The size of copied data, or a negative error code on failure.
1069  */
1070 int snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
1071                               unsigned char *buffer, int count)
1072 {
1073         unsigned long flags;
1074         int result, count1;
1075         struct snd_rawmidi_runtime *runtime = substream->runtime;
1076
1077         if (runtime->buffer == NULL) {
1078                 rmidi_dbg(substream->rmidi,
1079                           "snd_rawmidi_transmit_peek: output is not active!!!\n");
1080                 return -EINVAL;
1081         }
1082         result = 0;
1083         spin_lock_irqsave(&runtime->lock, flags);
1084         if (runtime->avail >= runtime->buffer_size) {
1085                 /* warning: lowlevel layer MUST trigger down the hardware */
1086                 goto __skip;
1087         }
1088         if (count == 1) {       /* special case, faster code */
1089                 *buffer = runtime->buffer[runtime->hw_ptr];
1090                 result++;
1091         } else {
1092                 count1 = runtime->buffer_size - runtime->hw_ptr;
1093                 if (count1 > count)
1094                         count1 = count;
1095                 if (count1 > (int)(runtime->buffer_size - runtime->avail))
1096                         count1 = runtime->buffer_size - runtime->avail;
1097                 memcpy(buffer, runtime->buffer + runtime->hw_ptr, count1);
1098                 count -= count1;
1099                 result += count1;
1100                 if (count > 0) {
1101                         if (count > (int)(runtime->buffer_size - runtime->avail - count1))
1102                                 count = runtime->buffer_size - runtime->avail - count1;
1103                         memcpy(buffer + count1, runtime->buffer, count);
1104                         result += count;
1105                 }
1106         }
1107       __skip:
1108         spin_unlock_irqrestore(&runtime->lock, flags);
1109         return result;
1110 }
1111
1112 /**
1113  * snd_rawmidi_transmit_ack - acknowledge the transmission
1114  * @substream: the rawmidi substream
1115  * @count: the transferred count
1116  *
1117  * Advances the hardware pointer for the internal output buffer with
1118  * the given size and updates the condition.
1119  * Call after the transmission is finished.
1120  *
1121  * Return: The advanced size if successful, or a negative error code on failure.
1122  */
1123 int snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count)
1124 {
1125         unsigned long flags;
1126         struct snd_rawmidi_runtime *runtime = substream->runtime;
1127
1128         if (runtime->buffer == NULL) {
1129                 rmidi_dbg(substream->rmidi,
1130                           "snd_rawmidi_transmit_ack: output is not active!!!\n");
1131                 return -EINVAL;
1132         }
1133         spin_lock_irqsave(&runtime->lock, flags);
1134         snd_BUG_ON(runtime->avail + count > runtime->buffer_size);
1135         runtime->hw_ptr += count;
1136         runtime->hw_ptr %= runtime->buffer_size;
1137         runtime->avail += count;
1138         substream->bytes += count;
1139         if (count > 0) {
1140                 if (runtime->drain || snd_rawmidi_ready(substream))
1141                         wake_up(&runtime->sleep);
1142         }
1143         spin_unlock_irqrestore(&runtime->lock, flags);
1144         return count;
1145 }
1146
1147 /**
1148  * snd_rawmidi_transmit - copy from the buffer to the device
1149  * @substream: the rawmidi substream
1150  * @buffer: the buffer pointer
1151  * @count: the data size to transfer
1152  *
1153  * Copies data from the buffer to the device and advances the pointer.
1154  *
1155  * Return: The copied size if successful, or a negative error code on failure.
1156  */
1157 int snd_rawmidi_transmit(struct snd_rawmidi_substream *substream,
1158                          unsigned char *buffer, int count)
1159 {
1160         if (!substream->opened)
1161                 return -EBADFD;
1162         count = snd_rawmidi_transmit_peek(substream, buffer, count);
1163         if (count < 0)
1164                 return count;
1165         return snd_rawmidi_transmit_ack(substream, count);
1166 }
1167
1168 static long snd_rawmidi_kernel_write1(struct snd_rawmidi_substream *substream,
1169                                       const unsigned char __user *userbuf,
1170                                       const unsigned char *kernelbuf,
1171                                       long count)
1172 {
1173         unsigned long flags;
1174         long count1, result;
1175         struct snd_rawmidi_runtime *runtime = substream->runtime;
1176
1177         if (snd_BUG_ON(!kernelbuf && !userbuf))
1178                 return -EINVAL;
1179         if (snd_BUG_ON(!runtime->buffer))
1180                 return -EINVAL;
1181
1182         result = 0;
1183         spin_lock_irqsave(&runtime->lock, flags);
1184         if (substream->append) {
1185                 if ((long)runtime->avail < count) {
1186                         spin_unlock_irqrestore(&runtime->lock, flags);
1187                         return -EAGAIN;
1188                 }
1189         }
1190         while (count > 0 && runtime->avail > 0) {
1191                 count1 = runtime->buffer_size - runtime->appl_ptr;
1192                 if (count1 > count)
1193                         count1 = count;
1194                 if (count1 > (long)runtime->avail)
1195                         count1 = runtime->avail;
1196                 if (kernelbuf)
1197                         memcpy(runtime->buffer + runtime->appl_ptr,
1198                                kernelbuf + result, count1);
1199                 else if (userbuf) {
1200                         spin_unlock_irqrestore(&runtime->lock, flags);
1201                         if (copy_from_user(runtime->buffer + runtime->appl_ptr,
1202                                            userbuf + result, count1)) {
1203                                 spin_lock_irqsave(&runtime->lock, flags);
1204                                 result = result > 0 ? result : -EFAULT;
1205                                 goto __end;
1206                         }
1207                         spin_lock_irqsave(&runtime->lock, flags);
1208                 }
1209                 runtime->appl_ptr += count1;
1210                 runtime->appl_ptr %= runtime->buffer_size;
1211                 runtime->avail -= count1;
1212                 result += count1;
1213                 count -= count1;
1214         }
1215       __end:
1216         count1 = runtime->avail < runtime->buffer_size;
1217         spin_unlock_irqrestore(&runtime->lock, flags);
1218         if (count1)
1219                 snd_rawmidi_output_trigger(substream, 1);
1220         return result;
1221 }
1222
1223 long snd_rawmidi_kernel_write(struct snd_rawmidi_substream *substream,
1224                               const unsigned char *buf, long count)
1225 {
1226         return snd_rawmidi_kernel_write1(substream, NULL, buf, count);
1227 }
1228
1229 static ssize_t snd_rawmidi_write(struct file *file, const char __user *buf,
1230                                  size_t count, loff_t *offset)
1231 {
1232         long result, timeout;
1233         int count1;
1234         struct snd_rawmidi_file *rfile;
1235         struct snd_rawmidi_runtime *runtime;
1236         struct snd_rawmidi_substream *substream;
1237
1238         rfile = file->private_data;
1239         substream = rfile->output;
1240         runtime = substream->runtime;
1241         /* we cannot put an atomic message to our buffer */
1242         if (substream->append && count > runtime->buffer_size)
1243                 return -EIO;
1244         result = 0;
1245         while (count > 0) {
1246                 spin_lock_irq(&runtime->lock);
1247                 while (!snd_rawmidi_ready_append(substream, count)) {
1248                         wait_queue_t wait;
1249                         if (file->f_flags & O_NONBLOCK) {
1250                                 spin_unlock_irq(&runtime->lock);
1251                                 return result > 0 ? result : -EAGAIN;
1252                         }
1253                         init_waitqueue_entry(&wait, current);
1254                         add_wait_queue(&runtime->sleep, &wait);
1255                         set_current_state(TASK_INTERRUPTIBLE);
1256                         spin_unlock_irq(&runtime->lock);
1257                         timeout = schedule_timeout(30 * HZ);
1258                         remove_wait_queue(&runtime->sleep, &wait);
1259                         if (rfile->rmidi->card->shutdown)
1260                                 return -ENODEV;
1261                         if (signal_pending(current))
1262                                 return result > 0 ? result : -ERESTARTSYS;
1263                         if (!runtime->avail && !timeout)
1264                                 return result > 0 ? result : -EIO;
1265                         spin_lock_irq(&runtime->lock);
1266                 }
1267                 spin_unlock_irq(&runtime->lock);
1268                 count1 = snd_rawmidi_kernel_write1(substream, buf, NULL, count);
1269                 if (count1 < 0)
1270                         return result > 0 ? result : count1;
1271                 result += count1;
1272                 buf += count1;
1273                 if ((size_t)count1 < count && (file->f_flags & O_NONBLOCK))
1274                         break;
1275                 count -= count1;
1276         }
1277         if (file->f_flags & O_DSYNC) {
1278                 spin_lock_irq(&runtime->lock);
1279                 while (runtime->avail != runtime->buffer_size) {
1280                         wait_queue_t wait;
1281                         unsigned int last_avail = runtime->avail;
1282                         init_waitqueue_entry(&wait, current);
1283                         add_wait_queue(&runtime->sleep, &wait);
1284                         set_current_state(TASK_INTERRUPTIBLE);
1285                         spin_unlock_irq(&runtime->lock);
1286                         timeout = schedule_timeout(30 * HZ);
1287                         remove_wait_queue(&runtime->sleep, &wait);
1288                         if (signal_pending(current))
1289                                 return result > 0 ? result : -ERESTARTSYS;
1290                         if (runtime->avail == last_avail && !timeout)
1291                                 return result > 0 ? result : -EIO;
1292                         spin_lock_irq(&runtime->lock);
1293                 }
1294                 spin_unlock_irq(&runtime->lock);
1295         }
1296         return result;
1297 }
1298
1299 static unsigned int snd_rawmidi_poll(struct file *file, poll_table * wait)
1300 {
1301         struct snd_rawmidi_file *rfile;
1302         struct snd_rawmidi_runtime *runtime;
1303         unsigned int mask;
1304
1305         rfile = file->private_data;
1306         if (rfile->input != NULL) {
1307                 runtime = rfile->input->runtime;
1308                 snd_rawmidi_input_trigger(rfile->input, 1);
1309                 poll_wait(file, &runtime->sleep, wait);
1310         }
1311         if (rfile->output != NULL) {
1312                 runtime = rfile->output->runtime;
1313                 poll_wait(file, &runtime->sleep, wait);
1314         }
1315         mask = 0;
1316         if (rfile->input != NULL) {
1317                 if (snd_rawmidi_ready(rfile->input))
1318                         mask |= POLLIN | POLLRDNORM;
1319         }
1320         if (rfile->output != NULL) {
1321                 if (snd_rawmidi_ready(rfile->output))
1322                         mask |= POLLOUT | POLLWRNORM;
1323         }
1324         return mask;
1325 }
1326
1327 /*
1328  */
1329 #ifdef CONFIG_COMPAT
1330 #include "rawmidi_compat.c"
1331 #else
1332 #define snd_rawmidi_ioctl_compat        NULL
1333 #endif
1334
1335 /*
1336
1337  */
1338
1339 static void snd_rawmidi_proc_info_read(struct snd_info_entry *entry,
1340                                        struct snd_info_buffer *buffer)
1341 {
1342         struct snd_rawmidi *rmidi;
1343         struct snd_rawmidi_substream *substream;
1344         struct snd_rawmidi_runtime *runtime;
1345
1346         rmidi = entry->private_data;
1347         snd_iprintf(buffer, "%s\n\n", rmidi->name);
1348         mutex_lock(&rmidi->open_mutex);
1349         if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_OUTPUT) {
1350                 list_for_each_entry(substream,
1351                                     &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams,
1352                                     list) {
1353                         snd_iprintf(buffer,
1354                                     "Output %d\n"
1355                                     "  Tx bytes     : %lu\n",
1356                                     substream->number,
1357                                     (unsigned long) substream->bytes);
1358                         if (substream->opened) {
1359                                 snd_iprintf(buffer,
1360                                     "  Owner PID    : %d\n",
1361                                     pid_vnr(substream->pid));
1362                                 runtime = substream->runtime;
1363                                 snd_iprintf(buffer,
1364                                     "  Mode         : %s\n"
1365                                     "  Buffer size  : %lu\n"
1366                                     "  Avail        : %lu\n",
1367                                     runtime->oss ? "OSS compatible" : "native",
1368                                     (unsigned long) runtime->buffer_size,
1369                                     (unsigned long) runtime->avail);
1370                         }
1371                 }
1372         }
1373         if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_INPUT) {
1374                 list_for_each_entry(substream,
1375                                     &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams,
1376                                     list) {
1377                         snd_iprintf(buffer,
1378                                     "Input %d\n"
1379                                     "  Rx bytes     : %lu\n",
1380                                     substream->number,
1381                                     (unsigned long) substream->bytes);
1382                         if (substream->opened) {
1383                                 snd_iprintf(buffer,
1384                                             "  Owner PID    : %d\n",
1385                                             pid_vnr(substream->pid));
1386                                 runtime = substream->runtime;
1387                                 snd_iprintf(buffer,
1388                                             "  Buffer size  : %lu\n"
1389                                             "  Avail        : %lu\n"
1390                                             "  Overruns     : %lu\n",
1391                                             (unsigned long) runtime->buffer_size,
1392                                             (unsigned long) runtime->avail,
1393                                             (unsigned long) runtime->xruns);
1394                         }
1395                 }
1396         }
1397         mutex_unlock(&rmidi->open_mutex);
1398 }
1399
1400 /*
1401  *  Register functions
1402  */
1403
1404 static const struct file_operations snd_rawmidi_f_ops =
1405 {
1406         .owner =        THIS_MODULE,
1407         .read =         snd_rawmidi_read,
1408         .write =        snd_rawmidi_write,
1409         .open =         snd_rawmidi_open,
1410         .release =      snd_rawmidi_release,
1411         .llseek =       no_llseek,
1412         .poll =         snd_rawmidi_poll,
1413         .unlocked_ioctl =       snd_rawmidi_ioctl,
1414         .compat_ioctl = snd_rawmidi_ioctl_compat,
1415 };
1416
1417 static int snd_rawmidi_alloc_substreams(struct snd_rawmidi *rmidi,
1418                                         struct snd_rawmidi_str *stream,
1419                                         int direction,
1420                                         int count)
1421 {
1422         struct snd_rawmidi_substream *substream;
1423         int idx;
1424
1425         for (idx = 0; idx < count; idx++) {
1426                 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
1427                 if (substream == NULL) {
1428                         rmidi_err(rmidi, "rawmidi: cannot allocate substream\n");
1429                         return -ENOMEM;
1430                 }
1431                 substream->stream = direction;
1432                 substream->number = idx;
1433                 substream->rmidi = rmidi;
1434                 substream->pstr = stream;
1435                 list_add_tail(&substream->list, &stream->substreams);
1436                 stream->substream_count++;
1437         }
1438         return 0;
1439 }
1440
1441 /**
1442  * snd_rawmidi_new - create a rawmidi instance
1443  * @card: the card instance
1444  * @id: the id string
1445  * @device: the device index
1446  * @output_count: the number of output streams
1447  * @input_count: the number of input streams
1448  * @rrawmidi: the pointer to store the new rawmidi instance
1449  *
1450  * Creates a new rawmidi instance.
1451  * Use snd_rawmidi_set_ops() to set the operators to the new instance.
1452  *
1453  * Return: Zero if successful, or a negative error code on failure.
1454  */
1455 int snd_rawmidi_new(struct snd_card *card, char *id, int device,
1456                     int output_count, int input_count,
1457                     struct snd_rawmidi ** rrawmidi)
1458 {
1459         struct snd_rawmidi *rmidi;
1460         int err;
1461         static struct snd_device_ops ops = {
1462                 .dev_free = snd_rawmidi_dev_free,
1463                 .dev_register = snd_rawmidi_dev_register,
1464                 .dev_disconnect = snd_rawmidi_dev_disconnect,
1465         };
1466
1467         if (snd_BUG_ON(!card))
1468                 return -ENXIO;
1469         if (rrawmidi)
1470                 *rrawmidi = NULL;
1471         rmidi = kzalloc(sizeof(*rmidi), GFP_KERNEL);
1472         if (rmidi == NULL) {
1473                 dev_err(card->dev, "rawmidi: cannot allocate\n");
1474                 return -ENOMEM;
1475         }
1476         rmidi->card = card;
1477         rmidi->device = device;
1478         mutex_init(&rmidi->open_mutex);
1479         init_waitqueue_head(&rmidi->open_wait);
1480         INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams);
1481         INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams);
1482
1483         if (id != NULL)
1484                 strlcpy(rmidi->id, id, sizeof(rmidi->id));
1485         if ((err = snd_rawmidi_alloc_substreams(rmidi,
1486                                                 &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT],
1487                                                 SNDRV_RAWMIDI_STREAM_INPUT,
1488                                                 input_count)) < 0) {
1489                 snd_rawmidi_free(rmidi);
1490                 return err;
1491         }
1492         if ((err = snd_rawmidi_alloc_substreams(rmidi,
1493                                                 &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT],
1494                                                 SNDRV_RAWMIDI_STREAM_OUTPUT,
1495                                                 output_count)) < 0) {
1496                 snd_rawmidi_free(rmidi);
1497                 return err;
1498         }
1499         if ((err = snd_device_new(card, SNDRV_DEV_RAWMIDI, rmidi, &ops)) < 0) {
1500                 snd_rawmidi_free(rmidi);
1501                 return err;
1502         }
1503         if (rrawmidi)
1504                 *rrawmidi = rmidi;
1505         return 0;
1506 }
1507
1508 static void snd_rawmidi_free_substreams(struct snd_rawmidi_str *stream)
1509 {
1510         struct snd_rawmidi_substream *substream;
1511
1512         while (!list_empty(&stream->substreams)) {
1513                 substream = list_entry(stream->substreams.next, struct snd_rawmidi_substream, list);
1514                 list_del(&substream->list);
1515                 kfree(substream);
1516         }
1517 }
1518
1519 static int snd_rawmidi_free(struct snd_rawmidi *rmidi)
1520 {
1521         if (!rmidi)
1522                 return 0;
1523
1524         snd_info_free_entry(rmidi->proc_entry);
1525         rmidi->proc_entry = NULL;
1526         mutex_lock(&register_mutex);
1527         if (rmidi->ops && rmidi->ops->dev_unregister)
1528                 rmidi->ops->dev_unregister(rmidi);
1529         mutex_unlock(&register_mutex);
1530
1531         snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT]);
1532         snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT]);
1533         if (rmidi->private_free)
1534                 rmidi->private_free(rmidi);
1535         kfree(rmidi);
1536         return 0;
1537 }
1538
1539 static int snd_rawmidi_dev_free(struct snd_device *device)
1540 {
1541         struct snd_rawmidi *rmidi = device->device_data;
1542         return snd_rawmidi_free(rmidi);
1543 }
1544
1545 #if defined(CONFIG_SND_SEQUENCER) || (defined(MODULE) && defined(CONFIG_SND_SEQUENCER_MODULE))
1546 static void snd_rawmidi_dev_seq_free(struct snd_seq_device *device)
1547 {
1548         struct snd_rawmidi *rmidi = device->private_data;
1549         rmidi->seq_dev = NULL;
1550 }
1551 #endif
1552
1553 static int snd_rawmidi_dev_register(struct snd_device *device)
1554 {
1555         int err;
1556         struct snd_info_entry *entry;
1557         char name[16];
1558         struct snd_rawmidi *rmidi = device->device_data;
1559
1560         if (rmidi->device >= SNDRV_RAWMIDI_DEVICES)
1561                 return -ENOMEM;
1562         mutex_lock(&register_mutex);
1563         if (snd_rawmidi_search(rmidi->card, rmidi->device)) {
1564                 mutex_unlock(&register_mutex);
1565                 return -EBUSY;
1566         }
1567         list_add_tail(&rmidi->list, &snd_rawmidi_devices);
1568         sprintf(name, "midiC%iD%i", rmidi->card->number, rmidi->device);
1569         if ((err = snd_register_device(SNDRV_DEVICE_TYPE_RAWMIDI,
1570                                        rmidi->card, rmidi->device,
1571                                        &snd_rawmidi_f_ops, rmidi, name)) < 0) {
1572                 rmidi_err(rmidi, "unable to register rawmidi device %i:%i\n",
1573                           rmidi->card->number, rmidi->device);
1574                 list_del(&rmidi->list);
1575                 mutex_unlock(&register_mutex);
1576                 return err;
1577         }
1578         if (rmidi->ops && rmidi->ops->dev_register &&
1579             (err = rmidi->ops->dev_register(rmidi)) < 0) {
1580                 snd_unregister_device(SNDRV_DEVICE_TYPE_RAWMIDI, rmidi->card, rmidi->device);
1581                 list_del(&rmidi->list);
1582                 mutex_unlock(&register_mutex);
1583                 return err;
1584         }
1585 #ifdef CONFIG_SND_OSSEMUL
1586         rmidi->ossreg = 0;
1587         if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1588                 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1589                                             rmidi->card, 0, &snd_rawmidi_f_ops,
1590                                             rmidi) < 0) {
1591                         rmidi_err(rmidi,
1592                                   "unable to register OSS rawmidi device %i:%i\n",
1593                                   rmidi->card->number, 0);
1594                 } else {
1595                         rmidi->ossreg++;
1596 #ifdef SNDRV_OSS_INFO_DEV_MIDI
1597                         snd_oss_info_register(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number, rmidi->name);
1598 #endif
1599                 }
1600         }
1601         if ((int)rmidi->device == amidi_map[rmidi->card->number]) {
1602                 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1603                                             rmidi->card, 1, &snd_rawmidi_f_ops,
1604                                             rmidi) < 0) {
1605                         rmidi_err(rmidi,
1606                                   "unable to register OSS rawmidi device %i:%i\n",
1607                                   rmidi->card->number, 1);
1608                 } else {
1609                         rmidi->ossreg++;
1610                 }
1611         }
1612 #endif /* CONFIG_SND_OSSEMUL */
1613         mutex_unlock(&register_mutex);
1614         sprintf(name, "midi%d", rmidi->device);
1615         entry = snd_info_create_card_entry(rmidi->card, name, rmidi->card->proc_root);
1616         if (entry) {
1617                 entry->private_data = rmidi;
1618                 entry->c.text.read = snd_rawmidi_proc_info_read;
1619                 if (snd_info_register(entry) < 0) {
1620                         snd_info_free_entry(entry);
1621                         entry = NULL;
1622                 }
1623         }
1624         rmidi->proc_entry = entry;
1625 #if defined(CONFIG_SND_SEQUENCER) || (defined(MODULE) && defined(CONFIG_SND_SEQUENCER_MODULE))
1626         if (!rmidi->ops || !rmidi->ops->dev_register) { /* own registration mechanism */
1627                 if (snd_seq_device_new(rmidi->card, rmidi->device, SNDRV_SEQ_DEV_ID_MIDISYNTH, 0, &rmidi->seq_dev) >= 0) {
1628                         rmidi->seq_dev->private_data = rmidi;
1629                         rmidi->seq_dev->private_free = snd_rawmidi_dev_seq_free;
1630                         sprintf(rmidi->seq_dev->name, "MIDI %d-%d", rmidi->card->number, rmidi->device);
1631                         snd_device_register(rmidi->card, rmidi->seq_dev);
1632                 }
1633         }
1634 #endif
1635         return 0;
1636 }
1637
1638 static int snd_rawmidi_dev_disconnect(struct snd_device *device)
1639 {
1640         struct snd_rawmidi *rmidi = device->device_data;
1641         int dir;
1642
1643         mutex_lock(&register_mutex);
1644         mutex_lock(&rmidi->open_mutex);
1645         wake_up(&rmidi->open_wait);
1646         list_del_init(&rmidi->list);
1647         for (dir = 0; dir < 2; dir++) {
1648                 struct snd_rawmidi_substream *s;
1649                 list_for_each_entry(s, &rmidi->streams[dir].substreams, list) {
1650                         if (s->runtime)
1651                                 wake_up(&s->runtime->sleep);
1652                 }
1653         }
1654
1655 #ifdef CONFIG_SND_OSSEMUL
1656         if (rmidi->ossreg) {
1657                 if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1658                         snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 0);
1659 #ifdef SNDRV_OSS_INFO_DEV_MIDI
1660                         snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number);
1661 #endif
1662                 }
1663                 if ((int)rmidi->device == amidi_map[rmidi->card->number])
1664                         snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 1);
1665                 rmidi->ossreg = 0;
1666         }
1667 #endif /* CONFIG_SND_OSSEMUL */
1668         snd_unregister_device(SNDRV_DEVICE_TYPE_RAWMIDI, rmidi->card, rmidi->device);
1669         mutex_unlock(&rmidi->open_mutex);
1670         mutex_unlock(&register_mutex);
1671         return 0;
1672 }
1673
1674 /**
1675  * snd_rawmidi_set_ops - set the rawmidi operators
1676  * @rmidi: the rawmidi instance
1677  * @stream: the stream direction, SNDRV_RAWMIDI_STREAM_XXX
1678  * @ops: the operator table
1679  *
1680  * Sets the rawmidi operators for the given stream direction.
1681  */
1682 void snd_rawmidi_set_ops(struct snd_rawmidi *rmidi, int stream,
1683                          struct snd_rawmidi_ops *ops)
1684 {
1685         struct snd_rawmidi_substream *substream;
1686
1687         list_for_each_entry(substream, &rmidi->streams[stream].substreams, list)
1688                 substream->ops = ops;
1689 }
1690
1691 /*
1692  *  ENTRY functions
1693  */
1694
1695 static int __init alsa_rawmidi_init(void)
1696 {
1697
1698         snd_ctl_register_ioctl(snd_rawmidi_control_ioctl);
1699         snd_ctl_register_ioctl_compat(snd_rawmidi_control_ioctl);
1700 #ifdef CONFIG_SND_OSSEMUL
1701         { int i;
1702         /* check device map table */
1703         for (i = 0; i < SNDRV_CARDS; i++) {
1704                 if (midi_map[i] < 0 || midi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1705                         pr_err("ALSA: rawmidi: invalid midi_map[%d] = %d\n",
1706                                i, midi_map[i]);
1707                         midi_map[i] = 0;
1708                 }
1709                 if (amidi_map[i] < 0 || amidi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1710                         pr_err("ALSA: rawmidi: invalid amidi_map[%d] = %d\n",
1711                                i, amidi_map[i]);
1712                         amidi_map[i] = 1;
1713                 }
1714         }
1715         }
1716 #endif /* CONFIG_SND_OSSEMUL */
1717         return 0;
1718 }
1719
1720 static void __exit alsa_rawmidi_exit(void)
1721 {
1722         snd_ctl_unregister_ioctl(snd_rawmidi_control_ioctl);
1723         snd_ctl_unregister_ioctl_compat(snd_rawmidi_control_ioctl);
1724 }
1725
1726 module_init(alsa_rawmidi_init)
1727 module_exit(alsa_rawmidi_exit)
1728
1729 EXPORT_SYMBOL(snd_rawmidi_output_params);
1730 EXPORT_SYMBOL(snd_rawmidi_input_params);
1731 EXPORT_SYMBOL(snd_rawmidi_drop_output);
1732 EXPORT_SYMBOL(snd_rawmidi_drain_output);
1733 EXPORT_SYMBOL(snd_rawmidi_drain_input);
1734 EXPORT_SYMBOL(snd_rawmidi_receive);
1735 EXPORT_SYMBOL(snd_rawmidi_transmit_empty);
1736 EXPORT_SYMBOL(snd_rawmidi_transmit_peek);
1737 EXPORT_SYMBOL(snd_rawmidi_transmit_ack);
1738 EXPORT_SYMBOL(snd_rawmidi_transmit);
1739 EXPORT_SYMBOL(snd_rawmidi_new);
1740 EXPORT_SYMBOL(snd_rawmidi_set_ops);
1741 EXPORT_SYMBOL(snd_rawmidi_info_select);
1742 EXPORT_SYMBOL(snd_rawmidi_kernel_open);
1743 EXPORT_SYMBOL(snd_rawmidi_kernel_release);
1744 EXPORT_SYMBOL(snd_rawmidi_kernel_read);
1745 EXPORT_SYMBOL(snd_rawmidi_kernel_write);