SAFE public projects git trees. - safe/jmp/linux-2.6/blob - sound/core/rawmidi.c

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