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