sound/core/rawmidi.c

   1 /*
   2  *  Abstract layer for MIDI v1.0 stream
   3  *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
   4  *
   5  *
   6  *   This program is free software; you can redistribute it and/or modify
   7  *   it under the terms of the GNU General Public License as published by
   8  *   the Free Software Foundation; either version 2 of the License, or
   9  *   (at your option) any later version.
  10  *
  11  *   This program is distributed in the hope that it will be useful,
  12  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *   GNU General Public License for more details.
  15  *
  16  *   You should have received a copy of the GNU General Public License
  17  *   along with this program; if not, write to the Free Software
  18  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  19  *
  20  */
  21
  22 #include <sound/core.h>
  23 #include <linux/major.h>
  24 #include <linux/init.h>
  25 #include <linux/sched.h>
  26 #include <linux/slab.h>
  27 #include <linux/time.h>
  28 #include <linux/wait.h>
  29 #include <linux/mutex.h>
  30 #include <linux/moduleparam.h>
  31 #include <linux/delay.h>
  32 #include <sound/rawmidi.h>
  33 #include <sound/info.h>
  34 #include <sound/control.h>
  35 #include <sound/minors.h>
  36 #include <sound/initval.h>
  37
  38 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
  39 MODULE_DESCRIPTION("Midlevel RawMidi code for ALSA.");
  40 MODULE_LICENSE("GPL");
  41
  42 #ifdef CONFIG_SND_OSSEMUL
  43 static int midi_map[SNDRV_CARDS];
  44 static int amidi_map[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS-1)] = 1};
  45 module_param_array(midi_map, int, NULL, 0444);
  46 MODULE_PARM_DESC(midi_map, "Raw MIDI device number assigned to 1st OSS device.");
  47 module_param_array(amidi_map, int, NULL, 0444);
  48 MODULE_PARM_DESC(amidi_map, "Raw MIDI device number assigned to 2nd OSS device.");
  49 #endif /* CONFIG_SND_OSSEMUL */
  50
  51 static int snd_rawmidi_free(struct snd_rawmidi *rawmidi);
  52 static int snd_rawmidi_dev_free(struct snd_device *device);
  53 static int snd_rawmidi_dev_register(struct snd_device *device);
  54 static int snd_rawmidi_dev_disconnect(struct snd_device *device);
  55
  56 static LIST_HEAD(snd_rawmidi_devices);
  57 static DEFINE_MUTEX(register_mutex);
  58
  59 static struct snd_rawmidi *snd_rawmidi_search(struct snd_card *card, int device)
  60 {
  61         struct snd_rawmidi *rawmidi;
  62
  63         list_for_each_entry(rawmidi, &snd_rawmidi_devices, list)
  64                 if (rawmidi->card == card && rawmidi->device == device)
  65                         return rawmidi;
  66         return NULL;
  67 }
  68
  69 static inline unsigned short snd_rawmidi_file_flags(struct file *file)
  70 {
  71         switch (file->f_mode & (FMODE_READ | FMODE_WRITE)) {
  72         case FMODE_WRITE:
  73                 return SNDRV_RAWMIDI_LFLG_OUTPUT;
  74         case FMODE_READ:
  75                 return SNDRV_RAWMIDI_LFLG_INPUT;
  76         default:
  77                 return SNDRV_RAWMIDI_LFLG_OPEN;
  78         }
  79 }
  80
  81 static inline int snd_rawmidi_ready(struct snd_rawmidi_substream *substream)
  82 {
  83         struct snd_rawmidi_runtime *runtime = substream->runtime;
  84         return runtime->avail >= runtime->avail_min;
  85 }
  86
  87 static inline int snd_rawmidi_ready_append(struct snd_rawmidi_substream *substream,
  88                                            size_t count)
  89 {
  90         struct snd_rawmidi_runtime *runtime = substream->runtime;
  91         return runtime->avail >= runtime->avail_min &&
  92                (!substream->append || runtime->avail >= count);
  93 }
  94
  95 static void snd_rawmidi_input_event_tasklet(unsigned long data)
  96 {
  97         struct snd_rawmidi_substream *substream = (struct snd_rawmidi_substream *)data;
  98         substream->runtime->event(substream);
  99 }
 100
 101 static void snd_rawmidi_output_trigger_tasklet(unsigned long data)
 102 {
 103         struct snd_rawmidi_substream *substream = (struct snd_rawmidi_substream *)data;
 104         substream->ops->trigger(substream, 1);
 105 }
 106
 107 static int snd_rawmidi_runtime_create(struct snd_rawmidi_substream *substream)
 108 {
 109         struct snd_rawmidi_runtime *runtime;
 110
 111         if ((runtime = kzalloc(sizeof(*runtime), GFP_KERNEL)) == NULL)
 112                 return -ENOMEM;
 113         spin_lock_init(&runtime->lock);
 114         init_waitqueue_head(&runtime->sleep);
 115         if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
 116                 tasklet_init(&runtime->tasklet,
 117                              snd_rawmidi_input_event_tasklet,
 118                              (unsigned long)substream);
 119         else
 120                 tasklet_init(&runtime->tasklet,
 121                              snd_rawmidi_output_trigger_tasklet,
 122                              (unsigned long)substream);
 123         runtime->event = NULL;
 124         runtime->buffer_size = PAGE_SIZE;
 125         runtime->avail_min = 1;
 126         if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
 127                 runtime->avail = 0;
 128         else
 129                 runtime->avail = runtime->buffer_size;
 130         if ((runtime->buffer = kmalloc(runtime->buffer_size, GFP_KERNEL)) == NULL) {
 131                 kfree(runtime);
 132                 return -ENOMEM;
 133         }
 134         runtime->appl_ptr = runtime->hw_ptr = 0;
 135         substream->runtime = runtime;
 136         return 0;
 137 }
 138
 139 static int snd_rawmidi_runtime_free(struct snd_rawmidi_substream *substream)
 140 {
 141         struct snd_rawmidi_runtime *runtime = substream->runtime;
 142
 143         kfree(runtime->buffer);
 144         kfree(runtime);
 145         substream->runtime = NULL;
 146         return 0;
 147 }
 148
 149 static inline void snd_rawmidi_output_trigger(struct snd_rawmidi_substream *substream,int up)
 150 {
 151         if (!substream->opened)
 152                 return;
 153         if (up) {
 154                 tasklet_schedule(&substream->runtime->tasklet);
 155         } else {
 156                 tasklet_kill(&substream->runtime->tasklet);
 157                 substream->ops->trigger(substream, 0);
 158         }
 159 }
 160
 161 static void snd_rawmidi_input_trigger(struct snd_rawmidi_substream *substream, int up)
 162 {
 163         if (!substream->opened)
 164                 return;
 165         substream->ops->trigger(substream, up);
 166         if (!up && substream->runtime->event)
 167                 tasklet_kill(&substream->runtime->tasklet);
 168 }
 169
 170 int snd_rawmidi_drop_output(struct snd_rawmidi_substream *substream)
 171 {
 172         unsigned long flags;
 173         struct snd_rawmidi_runtime *runtime = substream->runtime;
 174
 175         snd_rawmidi_output_trigger(substream, 0);
 176         runtime->drain = 0;
 177         spin_lock_irqsave(&runtime->lock, flags);
 178         runtime->appl_ptr = runtime->hw_ptr = 0;
 179         runtime->avail = runtime->buffer_size;
 180         spin_unlock_irqrestore(&runtime->lock, flags);
 181         return 0;
 182 }
 183
 184 int snd_rawmidi_drain_output(struct snd_rawmidi_substream *substream)
 185 {
 186         int err;
 187         long timeout;
 188         struct snd_rawmidi_runtime *runtime = substream->runtime;
 189
 190         err = 0;
 191         runtime->drain = 1;
 192         timeout = wait_event_interruptible_timeout(runtime->sleep,
 193                                 (runtime->avail >= runtime->buffer_size),
 194                                 10*HZ);
 195         if (signal_pending(current))
 196                 err = -ERESTARTSYS;
 197         if (runtime->avail < runtime->buffer_size && !timeout) {
 198                 snd_printk(KERN_WARNING "rawmidi drain error (avail = %li, buffer_size = %li)\n", (long)runtime->avail, (long)runtime->buffer_size);
 199                 err = -EIO;
 200         }
 201         runtime->drain = 0;
 202         if (err != -ERESTARTSYS) {
 203                 /* we need wait a while to make sure that Tx FIFOs are empty */
 204                 if (substream->ops->drain)
 205                         substream->ops->drain(substream);
 206                 else
 207                         msleep(50);
 208                 snd_rawmidi_drop_output(substream);
 209         }
 210         return err;
 211 }
 212
 213 int snd_rawmidi_drain_input(struct snd_rawmidi_substream *substream)
 214 {
 215         unsigned long flags;
 216         struct snd_rawmidi_runtime *runtime = substream->runtime;
 217
 218         snd_rawmidi_input_trigger(substream, 0);
 219         runtime->drain = 0;
 220         spin_lock_irqsave(&runtime->lock, flags);
 221         runtime->appl_ptr = runtime->hw_ptr = 0;
 222         runtime->avail = 0;
 223         spin_unlock_irqrestore(&runtime->lock, flags);
 224         return 0;
 225 }
 226
 227 /* look for an available substream for the given stream direction;
 228  * if a specific subdevice is given, try to assign it
 229  */
 230 static int assign_substream(struct snd_rawmidi *rmidi, int subdevice,
 231                             int stream, int mode,
 232                             struct snd_rawmidi_substream **sub_ret)
 233 {
 234         struct snd_rawmidi_substream *substream;
 235         struct snd_rawmidi_str *s = &rmidi->streams[stream];
 236         static unsigned int info_flags[2] = {
 237                 [SNDRV_RAWMIDI_STREAM_OUTPUT] = SNDRV_RAWMIDI_INFO_OUTPUT,
 238                 [SNDRV_RAWMIDI_STREAM_INPUT] = SNDRV_RAWMIDI_INFO_INPUT,
 239         };
 240
 241         if (!(rmidi->info_flags & info_flags[stream]))
 242                 return -ENXIO;
 243         if (subdevice >= 0 && subdevice >= s->substream_count)
 244                 return -ENODEV;
 245
 246         list_for_each_entry(substream, &s->substreams, list) {
 247                 if (substream->opened) {
 248                         if (stream == SNDRV_RAWMIDI_STREAM_INPUT ||
 249                             !(mode & SNDRV_RAWMIDI_LFLG_APPEND) ||
 250                             !substream->append)
 251                                 continue;
 252                 }
 253                 if (subdevice < 0 || subdevice == substream->number) {
 254                         *sub_ret = substream;
 255                         return 0;
 256                 }
 257         }
 258         return -EAGAIN;
 259 }
 260
 261 /* open and do ref-counting for the given substream */
 262 static int open_substream(struct snd_rawmidi *rmidi,
 263                           struct snd_rawmidi_substream *substream,
 264                           int mode)
 265 {
 266         int err;
 267
 268         if (substream->use_count == 0) {
 269                 err = snd_rawmidi_runtime_create(substream);
 270                 if (err < 0)
 271                         return err;
 272                 err = substream->ops->open(substream);
 273                 if (err < 0) {
 274                         snd_rawmidi_runtime_free(substream);
 275                         return err;
 276                 }
 277                 substream->opened = 1;
 278                 substream->active_sensing = 0;
 279                 if (mode & SNDRV_RAWMIDI_LFLG_APPEND)
 280                         substream->append = 1;
 281                 substream->pid = get_pid(task_pid(current));
 282                 rmidi->streams[substream->stream].substream_opened++;
 283         }
 284         substream->use_count++;
 285         return 0;
 286 }
 287
 288 static void close_substream(struct snd_rawmidi *rmidi,
 289                             struct snd_rawmidi_substream *substream,
 290                             int cleanup);
 291
 292 static int rawmidi_open_priv(struct snd_rawmidi *rmidi, int subdevice, int mode,
 293                              struct snd_rawmidi_file *rfile)
 294 {
 295         struct snd_rawmidi_substream *sinput = NULL, *soutput = NULL;
 296         int err;
 297
 298         rfile->input = rfile->output = NULL;
 299         if (mode & SNDRV_RAWMIDI_LFLG_INPUT) {
 300                 err = assign_substream(rmidi, subdevice,
 301                                        SNDRV_RAWMIDI_STREAM_INPUT,
 302                                        mode, &sinput);
 303                 if (err < 0)
 304                         return err;
 305         }
 306         if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) {
 307                 err = assign_substream(rmidi, subdevice,
 308                                        SNDRV_RAWMIDI_STREAM_OUTPUT,
 309                                        mode, &soutput);
 310                 if (err < 0)
 311                         return err;
 312         }
 313
 314         if (sinput) {
 315                 err = open_substream(rmidi, sinput, mode);
 316                 if (err < 0)
 317                         return err;
 318         }
 319         if (soutput) {
 320                 err = open_substream(rmidi, soutput, mode);
 321                 if (err < 0) {
 322                         if (sinput)
 323                                 close_substream(rmidi, sinput, 0);
 324                         return err;
 325                 }
 326         }
 327
 328         rfile->rmidi = rmidi;
 329         rfile->input = sinput;
 330         rfile->output = soutput;
 331         return 0;
 332 }
 333
 334 /* called from sound/core/seq/seq_midi.c */
 335 int snd_rawmidi_kernel_open(struct snd_card *card, int device, int subdevice,
 336                             int mode, struct snd_rawmidi_file * rfile)
 337 {
 338         struct snd_rawmidi *rmidi;
 339         int err;
 340
 341         if (snd_BUG_ON(!rfile))
 342                 return -EINVAL;
 343
 344         mutex_lock(&register_mutex);
 345         rmidi = snd_rawmidi_search(card, device);
 346         if (rmidi == NULL) {
 347                 mutex_unlock(&register_mutex);
 348                 return -ENODEV;
 349         }
 350         if (!try_module_get(rmidi->card->module)) {
 351                 mutex_unlock(&register_mutex);
 352                 return -ENXIO;
 353         }
 354         mutex_unlock(&register_mutex);
 355
 356         mutex_lock(&rmidi->open_mutex);
 357         err = rawmidi_open_priv(rmidi, subdevice, mode, rfile);
 358         mutex_unlock(&rmidi->open_mutex);
 359         if (err < 0)
 360                 module_put(rmidi->card->module);
 361         return err;
 362 }
 363
 364 static int snd_rawmidi_open(struct inode *inode, struct file *file)
 365 {
 366         int maj = imajor(inode);
 367         struct snd_card *card;
 368         int subdevice;
 369         unsigned short fflags;
 370         int err;
 371         struct snd_rawmidi *rmidi;
 372         struct snd_rawmidi_file *rawmidi_file = NULL;
 373         wait_queue_t wait;
 374         struct snd_ctl_file *kctl;
 375
 376         if ((file->f_flags & O_APPEND) && !(file->f_flags & O_NONBLOCK))
 377                 return -EINVAL;         /* invalid combination */
 378
 379         err = nonseekable_open(inode, file);
 380         if (err < 0)
 381                 return err;
 382
 383         if (maj == snd_major) {
 384                 rmidi = snd_lookup_minor_data(iminor(inode),
 385                                               SNDRV_DEVICE_TYPE_RAWMIDI);
 386 #ifdef CONFIG_SND_OSSEMUL
 387         } else if (maj == SOUND_MAJOR) {
 388                 rmidi = snd_lookup_oss_minor_data(iminor(inode),
 389                                                   SNDRV_OSS_DEVICE_TYPE_MIDI);
 390 #endif
 391         } else
 392                 return -ENXIO;
 393
 394         if (rmidi == NULL)
 395                 return -ENODEV;
 396
 397         if (!try_module_get(rmidi->card->module))
 398                 return -ENXIO;
 399
 400         mutex_lock(&rmidi->open_mutex);
 401         card = rmidi->card;
 402         err = snd_card_file_add(card, file);
 403         if (err < 0)
 404                 goto __error_card;
 405         fflags = snd_rawmidi_file_flags(file);
 406         if ((file->f_flags & O_APPEND) || maj == SOUND_MAJOR) /* OSS emul? */
 407                 fflags |= SNDRV_RAWMIDI_LFLG_APPEND;
 408         rawmidi_file = kmalloc(sizeof(*rawmidi_file), GFP_KERNEL);
 409         if (rawmidi_file == NULL) {
 410                 err = -ENOMEM;
 411                 goto __error;
 412         }
 413         init_waitqueue_entry(&wait, current);
 414         add_wait_queue(&rmidi->open_wait, &wait);
 415         while (1) {
 416                 subdevice = -1;
 417                 read_lock(&card->ctl_files_rwlock);
 418                 list_for_each_entry(kctl, &card->ctl_files, list) {
 419                         if (kctl->pid == task_pid(current)) {
 420                                 subdevice = kctl->prefer_rawmidi_subdevice;
 421                                 if (subdevice != -1)
 422                                         break;
 423                         }
 424                 }
 425                 read_unlock(&card->ctl_files_rwlock);
 426                 err = rawmidi_open_priv(rmidi, subdevice, fflags, rawmidi_file);
 427                 if (err >= 0)
 428                         break;
 429                 if (err == -EAGAIN) {
 430                         if (file->f_flags & O_NONBLOCK) {
 431                                 err = -EBUSY;
 432                                 break;
 433                         }
 434                 } else
 435                         break;
 436                 set_current_state(TASK_INTERRUPTIBLE);
 437                 mutex_unlock(&rmidi->open_mutex);
 438                 schedule();
 439                 mutex_lock(&rmidi->open_mutex);
 440                 if (signal_pending(current)) {
 441                         err = -ERESTARTSYS;
 442                         break;
 443                 }
 444         }
 445         remove_wait_queue(&rmidi->open_wait, &wait);
 446         if (err < 0) {
 447                 kfree(rawmidi_file);
 448                 goto __error;
 449         }
 450 #ifdef CONFIG_SND_OSSEMUL
 451         if (rawmidi_file->input && rawmidi_file->input->runtime)
 452                 rawmidi_file->input->runtime->oss = (maj == SOUND_MAJOR);
 453         if (rawmidi_file->output && rawmidi_file->output->runtime)
 454                 rawmidi_file->output->runtime->oss = (maj == SOUND_MAJOR);
 455 #endif
 456         file->private_data = rawmidi_file;
 457         mutex_unlock(&rmidi->open_mutex);
 458         return 0;
 459
 460  __error:
 461         snd_card_file_remove(card, file);
 462  __error_card:
 463         mutex_unlock(&rmidi->open_mutex);
 464         module_put(rmidi->card->module);
 465         return err;
 466 }
 467
 468 static void close_substream(struct snd_rawmidi *rmidi,
 469                             struct snd_rawmidi_substream *substream,
 470                             int cleanup)
 471 {
 472         if (--substream->use_count)
 473                 return;
 474
 475         if (cleanup) {
 476                 if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
 477                         snd_rawmidi_input_trigger(substream, 0);
 478                 else {
 479                         if (substream->active_sensing) {
 480                                 unsigned char buf = 0xfe;
 481                                 /* sending single active sensing message
 482                                  * to shut the device up
 483                                  */
 484                                 snd_rawmidi_kernel_write(substream, &buf, 1);
 485                         }
 486                         if (snd_rawmidi_drain_output(substream) == -ERESTARTSYS)
 487                                 snd_rawmidi_output_trigger(substream, 0);
 488                 }
 489         }
 490         substream->ops->close(substream);
 491         if (substream->runtime->private_free)
 492                 substream->runtime->private_free(substream);
 493         snd_rawmidi_runtime_free(substream);
 494         substream->opened = 0;
 495         substream->append = 0;
 496         put_pid(substream->pid);
 497         substream->pid = NULL;
 498         rmidi->streams[substream->stream].substream_opened--;
 499 }
 500
 501 static void rawmidi_release_priv(struct snd_rawmidi_file *rfile)
 502 {
 503         struct snd_rawmidi *rmidi;
 504
 505         rmidi = rfile->rmidi;
 506         mutex_lock(&rmidi->open_mutex);
 507         if (rfile->input) {
 508                 close_substream(rmidi, rfile->input, 1);
 509                 rfile->input = NULL;
 510         }
 511         if (rfile->output) {
 512                 close_substream(rmidi, rfile->output, 1);
 513                 rfile->output = NULL;
 514         }
 515         rfile->rmidi = NULL;
 516         mutex_unlock(&rmidi->open_mutex);
 517         wake_up(&rmidi->open_wait);
 518 }
 519
 520 /* called from sound/core/seq/seq_midi.c */
 521 int snd_rawmidi_kernel_release(struct snd_rawmidi_file *rfile)
 522 {
 523         struct snd_rawmidi *rmidi;
 524
 525         if (snd_BUG_ON(!rfile))
 526                 return -ENXIO;
 527
 528         rmidi = rfile->rmidi;
 529         rawmidi_release_priv(rfile);
 530         module_put(rmidi->card->module);
 531         return 0;
 532 }
 533
 534 static int snd_rawmidi_release(struct inode *inode, struct file *file)
 535 {
 536         struct snd_rawmidi_file *rfile;
 537         struct snd_rawmidi *rmidi;
 538         struct module *module;
 539
 540         rfile = file->private_data;
 541         rmidi = rfile->rmidi;
 542         rawmidi_release_priv(rfile);
 543         kfree(rfile);
 544         module = rmidi->card->module;
 545         snd_card_file_remove(rmidi->card, file);
 546         module_put(module);
 547         return 0;
 548 }
 549
 550 static int snd_rawmidi_info(struct snd_rawmidi_substream *substream,
 551                             struct snd_rawmidi_info *info)
 552 {
 553         struct snd_rawmidi *rmidi;
 554
 555         if (substream == NULL)
 556                 return -ENODEV;
 557         rmidi = substream->rmidi;
 558         memset(info, 0, sizeof(*info));
 559         info->card = rmidi->card->number;
 560         info->device = rmidi->device;
 561         info->subdevice = substream->number;
 562         info->stream = substream->stream;
 563         info->flags = rmidi->info_flags;
 564         strcpy(info->id, rmidi->id);
 565         strcpy(info->name, rmidi->name);
 566         strcpy(info->subname, substream->name);
 567         info->subdevices_count = substream->pstr->substream_count;
 568         info->subdevices_avail = (substream->pstr->substream_count -
 569                                   substream->pstr->substream_opened);
 570         return 0;
 571 }
 572
 573 static int snd_rawmidi_info_user(struct snd_rawmidi_substream *substream,
 574                                  struct snd_rawmidi_info __user * _info)
 575 {
 576         struct snd_rawmidi_info info;
 577         int err;
 578         if ((err = snd_rawmidi_info(substream, &info)) < 0)
 579                 return err;
 580         if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
 581                 return -EFAULT;
 582         return 0;
 583 }
 584
 585 int snd_rawmidi_info_select(struct snd_card *card, struct snd_rawmidi_info *info)
 586 {
 587         struct snd_rawmidi *rmidi;
 588         struct snd_rawmidi_str *pstr;
 589         struct snd_rawmidi_substream *substream;
 590
 591         mutex_lock(&register_mutex);
 592         rmidi = snd_rawmidi_search(card, info->device);
 593         mutex_unlock(&register_mutex);
 594         if (!rmidi)
 595                 return -ENXIO;
 596         if (info->stream < 0 || info->stream > 1)
 597                 return -EINVAL;
 598         pstr = &rmidi->streams[info->stream];
 599         if (pstr->substream_count == 0)
 600                 return -ENOENT;
 601         if (info->subdevice >= pstr->substream_count)
 602                 return -ENXIO;
 603         list_for_each_entry(substream, &pstr->substreams, list) {
 604                 if ((unsigned int)substream->number == info->subdevice)
 605                         return snd_rawmidi_info(substream, info);
 606         }
 607         return -ENXIO;
 608 }
 609
 610 static int snd_rawmidi_info_select_user(struct snd_card *card,
 611                                         struct snd_rawmidi_info __user *_info)
 612 {
 613         int err;
 614         struct snd_rawmidi_info info;
 615         if (get_user(info.device, &_info->device))
 616                 return -EFAULT;
 617         if (get_user(info.stream, &_info->stream))
 618                 return -EFAULT;
 619         if (get_user(info.subdevice, &_info->subdevice))
 620                 return -EFAULT;
 621         if ((err = snd_rawmidi_info_select(card, &info)) < 0)
 622                 return err;
 623         if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
 624                 return -EFAULT;
 625         return 0;
 626 }
 627
 628 int snd_rawmidi_output_params(struct snd_rawmidi_substream *substream,
 629                               struct snd_rawmidi_params * params)
 630 {
 631         char *newbuf;
 632         struct snd_rawmidi_runtime *runtime = substream->runtime;
 633
 634         if (substream->append && substream->use_count > 1)
 635                 return -EBUSY;
 636         snd_rawmidi_drain_output(substream);
 637         if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L) {
 638                 return -EINVAL;
 639         }
 640         if (params->avail_min < 1 || params->avail_min > params->buffer_size) {
 641                 return -EINVAL;
 642         }
 643         if (params->buffer_size != runtime->buffer_size) {
 644                 newbuf = kmalloc(params->buffer_size, GFP_KERNEL);
 645                 if (!newbuf)
 646                         return -ENOMEM;
 647                 kfree(runtime->buffer);
 648                 runtime->buffer = newbuf;
 649                 runtime->buffer_size = params->buffer_size;
 650                 runtime->avail = runtime->buffer_size;
 651         }
 652         runtime->avail_min = params->avail_min;
 653         substream->active_sensing = !params->no_active_sensing;
 654         return 0;
 655 }
 656
 657 int snd_rawmidi_input_params(struct snd_rawmidi_substream *substream,
 658                              struct snd_rawmidi_params * params)
 659 {
 660         char *newbuf;
 661         struct snd_rawmidi_runtime *runtime = substream->runtime;
 662
 663         snd_rawmidi_drain_input(substream);
 664         if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L) {
 665                 return -EINVAL;
 666         }
 667         if (params->avail_min < 1 || params->avail_min > params->buffer_size) {
 668                 return -EINVAL;
 669         }
 670         if (params->buffer_size != runtime->buffer_size) {
 671                 newbuf = kmalloc(params->buffer_size, GFP_KERNEL);
 672                 if (!newbuf)
 673                         return -ENOMEM;
 674                 kfree(runtime->buffer);
 675                 runtime->buffer = newbuf;
 676                 runtime->buffer_size = params->buffer_size;
 677         }
 678         runtime->avail_min = params->avail_min;
 679         return 0;
 680 }
 681
 682 static int snd_rawmidi_output_status(struct snd_rawmidi_substream *substream,
 683                                      struct snd_rawmidi_status * status)
 684 {
 685         struct snd_rawmidi_runtime *runtime = substream->runtime;
 686
 687         memset(status, 0, sizeof(*status));
 688         status->stream = SNDRV_RAWMIDI_STREAM_OUTPUT;
 689         spin_lock_irq(&runtime->lock);
 690         status->avail = runtime->avail;
 691         spin_unlock_irq(&runtime->lock);
 692         return 0;
 693 }
 694
 695 static int snd_rawmidi_input_status(struct snd_rawmidi_substream *substream,
 696                                     struct snd_rawmidi_status * status)
 697 {
 698         struct snd_rawmidi_runtime *runtime = substream->runtime;
 699
 700         memset(status, 0, sizeof(*status));
 701         status->stream = SNDRV_RAWMIDI_STREAM_INPUT;
 702         spin_lock_irq(&runtime->lock);
 703         status->avail = runtime->avail;
 704         status->xruns = runtime->xruns;
 705         runtime->xruns = 0;
 706         spin_unlock_irq(&runtime->lock);
 707         return 0;
 708 }
 709
 710 static long snd_rawmidi_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 711 {
 712         struct snd_rawmidi_file *rfile;
 713         void __user *argp = (void __user *)arg;
 714
 715         rfile = file->private_data;
 716         if (((cmd >> 8) & 0xff) != 'W')
 717                 return -ENOTTY;
 718         switch (cmd) {
 719         case SNDRV_RAWMIDI_IOCTL_PVERSION:
 720                 return put_user(SNDRV_RAWMIDI_VERSION, (int __user *)argp) ? -EFAULT : 0;
 721         case SNDRV_RAWMIDI_IOCTL_INFO:
 722         {
 723                 int stream;
 724                 struct snd_rawmidi_info __user *info = argp;
 725                 if (get_user(stream, &info->stream))
 726                         return -EFAULT;
 727                 switch (stream) {
 728                 case SNDRV_RAWMIDI_STREAM_INPUT:
 729                         return snd_rawmidi_info_user(rfile->input, info);
 730                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
 731                         return snd_rawmidi_info_user(rfile->output, info);
 732                 default:
 733                         return -EINVAL;
 734                 }
 735         }
 736         case SNDRV_RAWMIDI_IOCTL_PARAMS:
 737         {
 738                 struct snd_rawmidi_params params;
 739                 if (copy_from_user(&params, argp, sizeof(struct snd_rawmidi_params)))
 740                         return -EFAULT;
 741                 switch (params.stream) {
 742                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
 743                         if (rfile->output == NULL)
 744                                 return -EINVAL;
 745                         return snd_rawmidi_output_params(rfile->output, &params);
 746                 case SNDRV_RAWMIDI_STREAM_INPUT:
 747                         if (rfile->input == NULL)
 748                                 return -EINVAL;
 749                         return snd_rawmidi_input_params(rfile->input, &params);
 750                 default:
 751                         return -EINVAL;
 752                 }
 753         }
 754         case SNDRV_RAWMIDI_IOCTL_STATUS:
 755         {
 756                 int err = 0;
 757                 struct snd_rawmidi_status status;
 758                 if (copy_from_user(&status, argp, sizeof(struct snd_rawmidi_status)))
 759                         return -EFAULT;
 760                 switch (status.stream) {
 761                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
 762                         if (rfile->output == NULL)
 763                                 return -EINVAL;
 764                         err = snd_rawmidi_output_status(rfile->output, &status);
 765                         break;
 766                 case SNDRV_RAWMIDI_STREAM_INPUT:
 767                         if (rfile->input == NULL)
 768                                 return -EINVAL;
 769                         err = snd_rawmidi_input_status(rfile->input, &status);
 770                         break;
 771                 default:
 772                         return -EINVAL;
 773                 }
 774                 if (err < 0)
 775                         return err;
 776                 if (copy_to_user(argp, &status, sizeof(struct snd_rawmidi_status)))
 777                         return -EFAULT;
 778                 return 0;
 779         }
 780         case SNDRV_RAWMIDI_IOCTL_DROP:
 781         {
 782                 int val;
 783                 if (get_user(val, (int __user *) argp))
 784                         return -EFAULT;
 785                 switch (val) {
 786                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
 787                         if (rfile->output == NULL)
 788                                 return -EINVAL;
 789                         return snd_rawmidi_drop_output(rfile->output);
 790                 default:
 791                         return -EINVAL;
 792                 }
 793         }
 794         case SNDRV_RAWMIDI_IOCTL_DRAIN:
 795         {
 796                 int val;
 797                 if (get_user(val, (int __user *) argp))
 798                         return -EFAULT;
 799                 switch (val) {
 800                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
 801                         if (rfile->output == NULL)
 802                                 return -EINVAL;
 803                         return snd_rawmidi_drain_output(rfile->output);
 804                 case SNDRV_RAWMIDI_STREAM_INPUT:
 805                         if (rfile->input == NULL)
 806                                 return -EINVAL;
 807                         return snd_rawmidi_drain_input(rfile->input);
 808                 default:
 809                         return -EINVAL;
 810                 }
 811         }
 812 #ifdef CONFIG_SND_DEBUG
 813         default:
 814                 snd_printk(KERN_WARNING "rawmidi: unknown command = 0x%x\n", cmd);
 815 #endif
 816         }
 817         return -ENOTTY;
 818 }
 819
 820 static int snd_rawmidi_control_ioctl(struct snd_card *card,
 821                                      struct snd_ctl_file *control,
 822                                      unsigned int cmd,
 823                                      unsigned long arg)
 824 {
 825         void __user *argp = (void __user *)arg;
 826
 827         switch (cmd) {
 828         case SNDRV_CTL_IOCTL_RAWMIDI_NEXT_DEVICE:
 829         {
 830                 int device;
 831
 832                 if (get_user(device, (int __user *)argp))
 833                         return -EFAULT;
 834                 if (device >= SNDRV_RAWMIDI_DEVICES) /* next device is -1 */
 835                         device = SNDRV_RAWMIDI_DEVICES - 1;
 836                 mutex_lock(&register_mutex);
 837                 device = device < 0 ? 0 : device + 1;
 838                 while (device < SNDRV_RAWMIDI_DEVICES) {
 839                         if (snd_rawmidi_search(card, device))
 840                                 break;
 841                         device++;
 842                 }
 843                 if (device == SNDRV_RAWMIDI_DEVICES)
 844                         device = -1;
 845                 mutex_unlock(&register_mutex);
 846                 if (put_user(device, (int __user *)argp))
 847                         return -EFAULT;
 848                 return 0;
 849         }
 850         case SNDRV_CTL_IOCTL_RAWMIDI_PREFER_SUBDEVICE:
 851         {
 852                 int val;
 853
 854                 if (get_user(val, (int __user *)argp))
 855                         return -EFAULT;
 856                 control->prefer_rawmidi_subdevice = val;
 857                 return 0;
 858         }
 859         case SNDRV_CTL_IOCTL_RAWMIDI_INFO:
 860                 return snd_rawmidi_info_select_user(card, argp);
 861         }
 862         return -ENOIOCTLCMD;
 863 }
 864
 865 /**
 866  * snd_rawmidi_receive - receive the input data from the device
 867  * @substream: the rawmidi substream
 868  * @buffer: the buffer pointer
 869  * @count: the data size to read
 870  *
 871  * Reads the data from the internal buffer.
 872  *
 873  * Returns the size of read data, or a negative error code on failure.
 874  */
 875 int snd_rawmidi_receive(struct snd_rawmidi_substream *substream,
 876                         const unsigned char *buffer, int count)
 877 {
 878         unsigned long flags;
 879         int result = 0, count1;
 880         struct snd_rawmidi_runtime *runtime = substream->runtime;
 881
 882         if (!substream->opened)
 883                 return -EBADFD;
 884         if (runtime->buffer == NULL) {
 885                 snd_printd("snd_rawmidi_receive: input is not active!!!\n");
 886                 return -EINVAL;
 887         }
 888         spin_lock_irqsave(&runtime->lock, flags);
 889         if (count == 1) {       /* special case, faster code */
 890                 substream->bytes++;
 891                 if (runtime->avail < runtime->buffer_size) {
 892                         runtime->buffer[runtime->hw_ptr++] = buffer[0];
 893                         runtime->hw_ptr %= runtime->buffer_size;
 894                         runtime->avail++;
 895                         result++;
 896                 } else {
 897                         runtime->xruns++;
 898                 }
 899         } else {
 900                 substream->bytes += count;
 901                 count1 = runtime->buffer_size - runtime->hw_ptr;
 902                 if (count1 > count)
 903                         count1 = count;
 904                 if (count1 > (int)(runtime->buffer_size - runtime->avail))
 905                         count1 = runtime->buffer_size - runtime->avail;
 906                 memcpy(runtime->buffer + runtime->hw_ptr, buffer, count1);
 907                 runtime->hw_ptr += count1;
 908                 runtime->hw_ptr %= runtime->buffer_size;
 909                 runtime->avail += count1;
 910                 count -= count1;
 911                 result += count1;
 912                 if (count > 0) {
 913                         buffer += count1;
 914                         count1 = count;
 915                         if (count1 > (int)(runtime->buffer_size - runtime->avail)) {
 916                                 count1 = runtime->buffer_size - runtime->avail;
 917                                 runtime->xruns += count - count1;
 918                         }
 919                         if (count1 > 0) {
 920                                 memcpy(runtime->buffer, buffer, count1);
 921                                 runtime->hw_ptr = count1;
 922                                 runtime->avail += count1;
 923                                 result += count1;
 924                         }
 925                 }
 926         }
 927         if (result > 0) {
 928                 if (runtime->event)
 929                         tasklet_schedule(&runtime->tasklet);
 930                 else if (snd_rawmidi_ready(substream))
 931                         wake_up(&runtime->sleep);
 932         }
 933         spin_unlock_irqrestore(&runtime->lock, flags);
 934         return result;
 935 }
 936
 937 static long snd_rawmidi_kernel_read1(struct snd_rawmidi_substream *substream,
 938                                      unsigned char __user *userbuf,
 939                                      unsigned char *kernelbuf, long count)
 940 {
 941         unsigned long flags;
 942         long result = 0, count1;
 943         struct snd_rawmidi_runtime *runtime = substream->runtime;
 944
 945         while (count > 0 && runtime->avail) {
 946                 count1 = runtime->buffer_size - runtime->appl_ptr;
 947                 if (count1 > count)
 948                         count1 = count;
 949                 spin_lock_irqsave(&runtime->lock, flags);
 950                 if (count1 > (int)runtime->avail)
 951                         count1 = runtime->avail;
 952                 if (kernelbuf)
 953                         memcpy(kernelbuf + result, runtime->buffer + runtime->appl_ptr, count1);
 954                 if (userbuf) {
 955                         spin_unlock_irqrestore(&runtime->lock, flags);
 956                         if (copy_to_user(userbuf + result,
 957                                          runtime->buffer + runtime->appl_ptr, count1)) {
 958                                 return result > 0 ? result : -EFAULT;
 959                         }
 960                         spin_lock_irqsave(&runtime->lock, flags);
 961                 }
 962                 runtime->appl_ptr += count1;
 963                 runtime->appl_ptr %= runtime->buffer_size;
 964                 runtime->avail -= count1;
 965                 spin_unlock_irqrestore(&runtime->lock, flags);
 966                 result += count1;
 967                 count -= count1;
 968         }
 969         return result;
 970 }
 971
 972 long snd_rawmidi_kernel_read(struct snd_rawmidi_substream *substream,
 973                              unsigned char *buf, long count)
 974 {
 975         snd_rawmidi_input_trigger(substream, 1);
 976         return snd_rawmidi_kernel_read1(substream, NULL/*userbuf*/, buf, count);
 977 }
 978
 979 static ssize_t snd_rawmidi_read(struct file *file, char __user *buf, size_t count,
 980                                 loff_t *offset)
 981 {
 982         long result;
 983         int count1;
 984         struct snd_rawmidi_file *rfile;
 985         struct snd_rawmidi_substream *substream;
 986         struct snd_rawmidi_runtime *runtime;
 987
 988         rfile = file->private_data;
 989         substream = rfile->input;
 990         if (substream == NULL)
 991                 return -EIO;
 992         runtime = substream->runtime;
 993         snd_rawmidi_input_trigger(substream, 1);
 994         result = 0;
 995         while (count > 0) {
 996                 spin_lock_irq(&runtime->lock);
 997                 while (!snd_rawmidi_ready(substream)) {
 998                         wait_queue_t wait;
 999                         if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1000                                 spin_unlock_irq(&runtime->lock);
1001                                 return result > 0 ? result : -EAGAIN;
1002                         }
1003                         init_waitqueue_entry(&wait, current);
1004                         add_wait_queue(&runtime->sleep, &wait);
1005                         set_current_state(TASK_INTERRUPTIBLE);
1006                         spin_unlock_irq(&runtime->lock);
1007                         schedule();
1008                         remove_wait_queue(&runtime->sleep, &wait);
1009                         if (signal_pending(current))
1010                                 return result > 0 ? result : -ERESTARTSYS;
1011                         if (!runtime->avail)
1012                                 return result > 0 ? result : -EIO;
1013                         spin_lock_irq(&runtime->lock);
1014                 }
1015                 spin_unlock_irq(&runtime->lock);
1016                 count1 = snd_rawmidi_kernel_read1(substream,
1017                                                   (unsigned char __user *)buf,
1018                                                   NULL/*kernelbuf*/,
1019                                                   count);
1020                 if (count1 < 0)
1021                         return result > 0 ? result : count1;
1022                 result += count1;
1023                 buf += count1;
1024                 count -= count1;
1025         }
1026         return result;
1027 }
1028
1029 /**
1030  * snd_rawmidi_transmit_empty - check whether the output buffer is empty
1031  * @substream: the rawmidi substream
1032  *
1033  * Returns 1 if the internal output buffer is empty, 0 if not.
1034  */
1035 int snd_rawmidi_transmit_empty(struct snd_rawmidi_substream *substream)
1036 {
1037         struct snd_rawmidi_runtime *runtime = substream->runtime;
1038         int result;
1039         unsigned long flags;
1040
1041         if (runtime->buffer == NULL) {
1042                 snd_printd("snd_rawmidi_transmit_empty: output is not active!!!\n");
1043                 return 1;
1044         }
1045         spin_lock_irqsave(&runtime->lock, flags);
1046         result = runtime->avail >= runtime->buffer_size;
1047         spin_unlock_irqrestore(&runtime->lock, flags);
1048         return result;
1049 }
1050
1051 /**
1052  * snd_rawmidi_transmit_peek - copy data from the internal buffer
1053  * @substream: the rawmidi substream
1054  * @buffer: the buffer pointer
1055  * @count: data size to transfer
1056  *
1057  * Copies data from the internal output buffer to the given buffer.
1058  *
1059  * Call this in the interrupt handler when the midi output is ready,
1060  * and call snd_rawmidi_transmit_ack() after the transmission is
1061  * finished.
1062  *
1063  * Returns the size of copied data, or a negative error code on failure.
1064  */
1065 int snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
1066                               unsigned char *buffer, int count)
1067 {
1068         unsigned long flags;
1069         int result, count1;
1070         struct snd_rawmidi_runtime *runtime = substream->runtime;
1071
1072         if (runtime->buffer == NULL) {
1073                 snd_printd("snd_rawmidi_transmit_peek: output is not active!!!\n");
1074                 return -EINVAL;
1075         }
1076         result = 0;
1077         spin_lock_irqsave(&runtime->lock, flags);
1078         if (runtime->avail >= runtime->buffer_size) {
1079                 /* warning: lowlevel layer MUST trigger down the hardware */
1080                 goto __skip;
1081         }
1082         if (count == 1) {       /* special case, faster code */
1083                 *buffer = runtime->buffer[runtime->hw_ptr];
1084                 result++;
1085         } else {
1086                 count1 = runtime->buffer_size - runtime->hw_ptr;
1087                 if (count1 > count)
1088                         count1 = count;
1089                 if (count1 > (int)(runtime->buffer_size - runtime->avail))
1090                         count1 = runtime->buffer_size - runtime->avail;
1091                 memcpy(buffer, runtime->buffer + runtime->hw_ptr, count1);
1092                 count -= count1;
1093                 result += count1;
1094                 if (count > 0) {
1095                         if (count > (int)(runtime->buffer_size - runtime->avail - count1))
1096                                 count = runtime->buffer_size - runtime->avail - count1;
1097                         memcpy(buffer + count1, runtime->buffer, count);
1098                         result += count;
1099                 }
1100         }
1101       __skip:
1102         spin_unlock_irqrestore(&runtime->lock, flags);
1103         return result;
1104 }
1105
1106 /**
1107  * snd_rawmidi_transmit_ack - acknowledge the transmission
1108  * @substream: the rawmidi substream
1109  * @count: the tranferred count
1110  *
1111  * Advances the hardware pointer for the internal output buffer with
1112  * the given size and updates the condition.
1113  * Call after the transmission is finished.
1114  *
1115  * Returns the advanced size if successful, or a negative error code on failure.
1116  */
1117 int snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count)
1118 {
1119         unsigned long flags;
1120         struct snd_rawmidi_runtime *runtime = substream->runtime;
1121
1122         if (runtime->buffer == NULL) {
1123                 snd_printd("snd_rawmidi_transmit_ack: output is not active!!!\n");
1124                 return -EINVAL;
1125         }
1126         spin_lock_irqsave(&runtime->lock, flags);
1127         snd_BUG_ON(runtime->avail + count > runtime->buffer_size);
1128         runtime->hw_ptr += count;
1129         runtime->hw_ptr %= runtime->buffer_size;
1130         runtime->avail += count;
1131         substream->bytes += count;
1132         if (count > 0) {
1133                 if (runtime->drain || snd_rawmidi_ready(substream))
1134                         wake_up(&runtime->sleep);
1135         }
1136         spin_unlock_irqrestore(&runtime->lock, flags);
1137         return count;
1138 }
1139
1140 /**
1141  * snd_rawmidi_transmit - copy from the buffer to the device
1142  * @substream: the rawmidi substream
1143  * @buffer: the buffer pointer
1144  * @count: the data size to transfer
1145  *
1146  * Copies data from the buffer to the device and advances the pointer.
1147  *
1148  * Returns the copied size if successful, or a negative error code on failure.
1149  */
1150 int snd_rawmidi_transmit(struct snd_rawmidi_substream *substream,
1151                          unsigned char *buffer, int count)
1152 {
1153         if (!substream->opened)
1154                 return -EBADFD;
1155         count = snd_rawmidi_transmit_peek(substream, buffer, count);
1156         if (count < 0)
1157                 return count;
1158         return snd_rawmidi_transmit_ack(substream, count);
1159 }
1160
1161 static long snd_rawmidi_kernel_write1(struct snd_rawmidi_substream *substream,
1162                                       const unsigned char __user *userbuf,
1163                                       const unsigned char *kernelbuf,
1164                                       long count)
1165 {
1166         unsigned long flags;
1167         long count1, result;
1168         struct snd_rawmidi_runtime *runtime = substream->runtime;
1169
1170         if (snd_BUG_ON(!kernelbuf && !userbuf))
1171                 return -EINVAL;
1172         if (snd_BUG_ON(!runtime->buffer))
1173                 return -EINVAL;
1174
1175         result = 0;
1176         spin_lock_irqsave(&runtime->lock, flags);
1177         if (substream->append) {
1178                 if ((long)runtime->avail < count) {
1179                         spin_unlock_irqrestore(&runtime->lock, flags);
1180                         return -EAGAIN;
1181                 }
1182         }
1183         while (count > 0 && runtime->avail > 0) {
1184                 count1 = runtime->buffer_size - runtime->appl_ptr;
1185                 if (count1 > count)
1186                         count1 = count;
1187                 if (count1 > (long)runtime->avail)
1188                         count1 = runtime->avail;
1189                 if (kernelbuf)
1190                         memcpy(runtime->buffer + runtime->appl_ptr,
1191                                kernelbuf + result, count1);
1192                 else if (userbuf) {
1193                         spin_unlock_irqrestore(&runtime->lock, flags);
1194                         if (copy_from_user(runtime->buffer + runtime->appl_ptr,
1195                                            userbuf + result, count1)) {
1196                                 spin_lock_irqsave(&runtime->lock, flags);
1197                                 result = result > 0 ? result : -EFAULT;
1198                                 goto __end;
1199                         }
1200                         spin_lock_irqsave(&runtime->lock, flags);
1201                 }
1202                 runtime->appl_ptr += count1;
1203                 runtime->appl_ptr %= runtime->buffer_size;
1204                 runtime->avail -= count1;
1205                 result += count1;
1206                 count -= count1;
1207         }
1208       __end:
1209         count1 = runtime->avail < runtime->buffer_size;
1210         spin_unlock_irqrestore(&runtime->lock, flags);
1211         if (count1)
1212                 snd_rawmidi_output_trigger(substream, 1);
1213         return result;
1214 }
1215
1216 long snd_rawmidi_kernel_write(struct snd_rawmidi_substream *substream,
1217                               const unsigned char *buf, long count)
1218 {
1219         return snd_rawmidi_kernel_write1(substream, NULL, buf, count);
1220 }
1221
1222 static ssize_t snd_rawmidi_write(struct file *file, const char __user *buf,
1223                                  size_t count, loff_t *offset)
1224 {
1225         long result, timeout;
1226         int count1;
1227         struct snd_rawmidi_file *rfile;
1228         struct snd_rawmidi_runtime *runtime;
1229         struct snd_rawmidi_substream *substream;
1230
1231         rfile = file->private_data;
1232         substream = rfile->output;
1233         runtime = substream->runtime;
1234         /* we cannot put an atomic message to our buffer */
1235         if (substream->append && count > runtime->buffer_size)
1236                 return -EIO;
1237         result = 0;
1238         while (count > 0) {
1239                 spin_lock_irq(&runtime->lock);
1240                 while (!snd_rawmidi_ready_append(substream, count)) {
1241                         wait_queue_t wait;
1242                         if (file->f_flags & O_NONBLOCK) {
1243                                 spin_unlock_irq(&runtime->lock);
1244                                 return result > 0 ? result : -EAGAIN;
1245                         }
1246                         init_waitqueue_entry(&wait, current);
1247                         add_wait_queue(&runtime->sleep, &wait);
1248                         set_current_state(TASK_INTERRUPTIBLE);
1249                         spin_unlock_irq(&runtime->lock);
1250                         timeout = schedule_timeout(30 * HZ);
1251                         remove_wait_queue(&runtime->sleep, &wait);
1252                         if (signal_pending(current))
1253                                 return result > 0 ? result : -ERESTARTSYS;
1254                         if (!runtime->avail && !timeout)
1255                                 return result > 0 ? result : -EIO;
1256                         spin_lock_irq(&runtime->lock);
1257                 }
1258                 spin_unlock_irq(&runtime->lock);
1259                 count1 = snd_rawmidi_kernel_write1(substream, buf, NULL, count);
1260                 if (count1 < 0)
1261                         return result > 0 ? result : count1;
1262                 result += count1;
1263                 buf += count1;
1264                 if ((size_t)count1 < count && (file->f_flags & O_NONBLOCK))
1265                         break;
1266                 count -= count1;
1267         }
1268         if (file->f_flags & O_DSYNC) {
1269                 spin_lock_irq(&runtime->lock);
1270                 while (runtime->avail != runtime->buffer_size) {
1271                         wait_queue_t wait;
1272                         unsigned int last_avail = runtime->avail;
1273                         init_waitqueue_entry(&wait, current);
1274                         add_wait_queue(&runtime->sleep, &wait);
1275                         set_current_state(TASK_INTERRUPTIBLE);
1276                         spin_unlock_irq(&runtime->lock);
1277                         timeout = schedule_timeout(30 * HZ);
1278                         remove_wait_queue(&runtime->sleep, &wait);
1279                         if (signal_pending(current))
1280                                 return result > 0 ? result : -ERESTARTSYS;
1281                         if (runtime->avail == last_avail && !timeout)
1282                                 return result > 0 ? result : -EIO;
1283                         spin_lock_irq(&runtime->lock);
1284                 }
1285                 spin_unlock_irq(&runtime->lock);
1286         }
1287         return result;
1288 }
1289
1290 static unsigned int snd_rawmidi_poll(struct file *file, poll_table * wait)
1291 {
1292         struct snd_rawmidi_file *rfile;
1293         struct snd_rawmidi_runtime *runtime;
1294         unsigned int mask;
1295
1296         rfile = file->private_data;
1297         if (rfile->input != NULL) {
1298                 runtime = rfile->input->runtime;
1299                 snd_rawmidi_input_trigger(rfile->input, 1);
1300                 poll_wait(file, &runtime->sleep, wait);
1301         }
1302         if (rfile->output != NULL) {
1303                 runtime = rfile->output->runtime;
1304                 poll_wait(file, &runtime->sleep, wait);
1305         }
1306         mask = 0;
1307         if (rfile->input != NULL) {
1308                 if (snd_rawmidi_ready(rfile->input))
1309                         mask |= POLLIN | POLLRDNORM;
1310         }
1311         if (rfile->output != NULL) {
1312                 if (snd_rawmidi_ready(rfile->output))
1313                         mask |= POLLOUT | POLLWRNORM;
1314         }
1315         return mask;
1316 }
1317
1318 /*
1319  */
1320 #ifdef CONFIG_COMPAT
1321 #include "rawmidi_compat.c"
1322 #else
1323 #define snd_rawmidi_ioctl_compat        NULL
1324 #endif
1325
1326 /*
1327
1328  */
1329
1330 static void snd_rawmidi_proc_info_read(struct snd_info_entry *entry,
1331                                        struct snd_info_buffer *buffer)
1332 {
1333         struct snd_rawmidi *rmidi;
1334         struct snd_rawmidi_substream *substream;
1335         struct snd_rawmidi_runtime *runtime;
1336
1337         rmidi = entry->private_data;
1338         snd_iprintf(buffer, "%s\n\n", rmidi->name);
1339         mutex_lock(&rmidi->open_mutex);
1340         if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_OUTPUT) {
1341                 list_for_each_entry(substream,
1342                                     &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams,
1343                                     list) {
1344                         snd_iprintf(buffer,
1345                                     "Output %d\n"
1346                                     "  Tx bytes     : %lu\n",
1347                                     substream->number,
1348                                     (unsigned long) substream->bytes);
1349                         if (substream->opened) {
1350                                 snd_iprintf(buffer,
1351                                     "  Owner PID    : %d\n",
1352                                     pid_vnr(substream->pid));
1353                                 runtime = substream->runtime;
1354                                 snd_iprintf(buffer,
1355                                     "  Mode         : %s\n"
1356                                     "  Buffer size  : %lu\n"
1357                                     "  Avail        : %lu\n",
1358                                     runtime->oss ? "OSS compatible" : "native",
1359                                     (unsigned long) runtime->buffer_size,
1360                                     (unsigned long) runtime->avail);
1361                         }
1362                 }
1363         }
1364         if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_INPUT) {
1365                 list_for_each_entry(substream,
1366                                     &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams,
1367                                     list) {
1368                         snd_iprintf(buffer,
1369                                     "Input %d\n"
1370                                     "  Rx bytes     : %lu\n",
1371                                     substream->number,
1372                                     (unsigned long) substream->bytes);
1373                         if (substream->opened) {
1374                                 snd_iprintf(buffer,
1375                                             "  Owner PID    : %d\n",
1376                                             pid_vnr(substream->pid));
1377                                 runtime = substream->runtime;
1378                                 snd_iprintf(buffer,
1379                                             "  Buffer size  : %lu\n"
1380                                             "  Avail        : %lu\n"
1381                                             "  Overruns     : %lu\n",
1382                                             (unsigned long) runtime->buffer_size,
1383                                             (unsigned long) runtime->avail,
1384                                             (unsigned long) runtime->xruns);
1385                         }
1386                 }
1387         }
1388         mutex_unlock(&rmidi->open_mutex);
1389 }
1390
1391 /*
1392  *  Register functions
1393  */
1394
1395 static const struct file_operations snd_rawmidi_f_ops =
1396 {
1397         .owner =        THIS_MODULE,
1398         .read =         snd_rawmidi_read,
1399         .write =        snd_rawmidi_write,
1400         .open =         snd_rawmidi_open,
1401         .release =      snd_rawmidi_release,
1402         .llseek =       no_llseek,
1403         .poll =         snd_rawmidi_poll,
1404         .unlocked_ioctl =       snd_rawmidi_ioctl,
1405         .compat_ioctl = snd_rawmidi_ioctl_compat,
1406 };
1407
1408 static int snd_rawmidi_alloc_substreams(struct snd_rawmidi *rmidi,
1409                                         struct snd_rawmidi_str *stream,
1410                                         int direction,
1411                                         int count)
1412 {
1413         struct snd_rawmidi_substream *substream;
1414         int idx;
1415
1416         for (idx = 0; idx < count; idx++) {
1417                 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
1418                 if (substream == NULL) {
1419                         snd_printk(KERN_ERR "rawmidi: cannot allocate substream\n");
1420                         return -ENOMEM;
1421                 }
1422                 substream->stream = direction;
1423                 substream->number = idx;
1424                 substream->rmidi = rmidi;
1425                 substream->pstr = stream;
1426                 list_add_tail(&substream->list, &stream->substreams);
1427                 stream->substream_count++;
1428         }
1429         return 0;
1430 }
1431
1432 /**
1433  * snd_rawmidi_new - create a rawmidi instance
1434  * @card: the card instance
1435  * @id: the id string
1436  * @device: the device index
1437  * @output_count: the number of output streams
1438  * @input_count: the number of input streams
1439  * @rrawmidi: the pointer to store the new rawmidi instance
1440  *
1441  * Creates a new rawmidi instance.
1442  * Use snd_rawmidi_set_ops() to set the operators to the new instance.
1443  *
1444  * Returns zero if successful, or a negative error code on failure.
1445  */
1446 int snd_rawmidi_new(struct snd_card *card, char *id, int device,
1447                     int output_count, int input_count,
1448                     struct snd_rawmidi ** rrawmidi)
1449 {
1450         struct snd_rawmidi *rmidi;
1451         int err;
1452         static struct snd_device_ops ops = {
1453                 .dev_free = snd_rawmidi_dev_free,
1454                 .dev_register = snd_rawmidi_dev_register,
1455                 .dev_disconnect = snd_rawmidi_dev_disconnect,
1456         };
1457
1458         if (snd_BUG_ON(!card))
1459                 return -ENXIO;
1460         if (rrawmidi)
1461                 *rrawmidi = NULL;
1462         rmidi = kzalloc(sizeof(*rmidi), GFP_KERNEL);
1463         if (rmidi == NULL) {
1464                 snd_printk(KERN_ERR "rawmidi: cannot allocate\n");
1465                 return -ENOMEM;
1466         }
1467         rmidi->card = card;
1468         rmidi->device = device;
1469         mutex_init(&rmidi->open_mutex);
1470         init_waitqueue_head(&rmidi->open_wait);
1471         INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams);
1472         INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams);
1473
1474         if (id != NULL)
1475                 strlcpy(rmidi->id, id, sizeof(rmidi->id));
1476         if ((err = snd_rawmidi_alloc_substreams(rmidi,
1477                                                 &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT],
1478                                                 SNDRV_RAWMIDI_STREAM_INPUT,
1479                                                 input_count)) < 0) {
1480                 snd_rawmidi_free(rmidi);
1481                 return err;
1482         }
1483         if ((err = snd_rawmidi_alloc_substreams(rmidi,
1484                                                 &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT],
1485                                                 SNDRV_RAWMIDI_STREAM_OUTPUT,
1486                                                 output_count)) < 0) {
1487                 snd_rawmidi_free(rmidi);
1488                 return err;
1489         }
1490         if ((err = snd_device_new(card, SNDRV_DEV_RAWMIDI, rmidi, &ops)) < 0) {
1491                 snd_rawmidi_free(rmidi);
1492                 return err;
1493         }
1494         if (rrawmidi)
1495                 *rrawmidi = rmidi;
1496         return 0;
1497 }
1498
1499 static void snd_rawmidi_free_substreams(struct snd_rawmidi_str *stream)
1500 {
1501         struct snd_rawmidi_substream *substream;
1502
1503         while (!list_empty(&stream->substreams)) {
1504                 substream = list_entry(stream->substreams.next, struct snd_rawmidi_substream, list);
1505                 list_del(&substream->list);
1506                 kfree(substream);
1507         }
1508 }
1509
1510 static int snd_rawmidi_free(struct snd_rawmidi *rmidi)
1511 {
1512         if (!rmidi)
1513                 return 0;
1514
1515         snd_info_free_entry(rmidi->proc_entry);
1516         rmidi->proc_entry = NULL;
1517         mutex_lock(&register_mutex);
1518         if (rmidi->ops && rmidi->ops->dev_unregister)
1519                 rmidi->ops->dev_unregister(rmidi);
1520         mutex_unlock(&register_mutex);
1521
1522         snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT]);
1523         snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT]);
1524         if (rmidi->private_free)
1525                 rmidi->private_free(rmidi);
1526         kfree(rmidi);
1527         return 0;
1528 }
1529
1530 static int snd_rawmidi_dev_free(struct snd_device *device)
1531 {
1532         struct snd_rawmidi *rmidi = device->device_data;
1533         return snd_rawmidi_free(rmidi);
1534 }
1535
1536 #if defined(CONFIG_SND_SEQUENCER) || (defined(MODULE) && defined(CONFIG_SND_SEQUENCER_MODULE))
1537 static void snd_rawmidi_dev_seq_free(struct snd_seq_device *device)
1538 {
1539         struct snd_rawmidi *rmidi = device->private_data;
1540         rmidi->seq_dev = NULL;
1541 }
1542 #endif
1543
1544 static int snd_rawmidi_dev_register(struct snd_device *device)
1545 {
1546         int err;
1547         struct snd_info_entry *entry;
1548         char name[16];
1549         struct snd_rawmidi *rmidi = device->device_data;
1550
1551         if (rmidi->device >= SNDRV_RAWMIDI_DEVICES)
1552                 return -ENOMEM;
1553         mutex_lock(&register_mutex);
1554         if (snd_rawmidi_search(rmidi->card, rmidi->device)) {
1555                 mutex_unlock(&register_mutex);
1556                 return -EBUSY;
1557         }
1558         list_add_tail(&rmidi->list, &snd_rawmidi_devices);
1559         sprintf(name, "midiC%iD%i", rmidi->card->number, rmidi->device);
1560         if ((err = snd_register_device(SNDRV_DEVICE_TYPE_RAWMIDI,
1561                                        rmidi->card, rmidi->device,
1562                                        &snd_rawmidi_f_ops, rmidi, name)) < 0) {
1563                 snd_printk(KERN_ERR "unable to register rawmidi device %i:%i\n", rmidi->card->number, rmidi->device);
1564                 list_del(&rmidi->list);
1565                 mutex_unlock(&register_mutex);
1566                 return err;
1567         }
1568         if (rmidi->ops && rmidi->ops->dev_register &&
1569             (err = rmidi->ops->dev_register(rmidi)) < 0) {
1570                 snd_unregister_device(SNDRV_DEVICE_TYPE_RAWMIDI, rmidi->card, rmidi->device);
1571                 list_del(&rmidi->list);
1572                 mutex_unlock(&register_mutex);
1573                 return err;
1574         }
1575 #ifdef CONFIG_SND_OSSEMUL
1576         rmidi->ossreg = 0;
1577         if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1578                 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1579                                             rmidi->card, 0, &snd_rawmidi_f_ops,
1580                                             rmidi, name) < 0) {
1581                         snd_printk(KERN_ERR "unable to register OSS rawmidi device %i:%i\n", rmidi->card->number, 0);
1582                 } else {
1583                         rmidi->ossreg++;
1584 #ifdef SNDRV_OSS_INFO_DEV_MIDI
1585                         snd_oss_info_register(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number, rmidi->name);
1586 #endif
1587                 }
1588         }
1589         if ((int)rmidi->device == amidi_map[rmidi->card->number]) {
1590                 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1591                                             rmidi->card, 1, &snd_rawmidi_f_ops,
1592                                             rmidi, name) < 0) {
1593                         snd_printk(KERN_ERR "unable to register OSS rawmidi device %i:%i\n", rmidi->card->number, 1);
1594                 } else {
1595                         rmidi->ossreg++;
1596                 }
1597         }
1598 #endif /* CONFIG_SND_OSSEMUL */
1599         mutex_unlock(&register_mutex);
1600         sprintf(name, "midi%d", rmidi->device);
1601         entry = snd_info_create_card_entry(rmidi->card, name, rmidi->card->proc_root);
1602         if (entry) {
1603                 entry->private_data = rmidi;
1604                 entry->c.text.read = snd_rawmidi_proc_info_read;
1605                 if (snd_info_register(entry) < 0) {
1606                         snd_info_free_entry(entry);
1607                         entry = NULL;
1608                 }
1609         }
1610         rmidi->proc_entry = entry;
1611 #if defined(CONFIG_SND_SEQUENCER) || (defined(MODULE) && defined(CONFIG_SND_SEQUENCER_MODULE))
1612         if (!rmidi->ops || !rmidi->ops->dev_register) { /* own registration mechanism */
1613                 if (snd_seq_device_new(rmidi->card, rmidi->device, SNDRV_SEQ_DEV_ID_MIDISYNTH, 0, &rmidi->seq_dev) >= 0) {
1614                         rmidi->seq_dev->private_data = rmidi;
1615                         rmidi->seq_dev->private_free = snd_rawmidi_dev_seq_free;
1616                         sprintf(rmidi->seq_dev->name, "MIDI %d-%d", rmidi->card->number, rmidi->device);
1617                         snd_device_register(rmidi->card, rmidi->seq_dev);
1618                 }
1619         }
1620 #endif
1621         return 0;
1622 }
1623
1624 static int snd_rawmidi_dev_disconnect(struct snd_device *device)
1625 {
1626         struct snd_rawmidi *rmidi = device->device_data;
1627
1628         mutex_lock(&register_mutex);
1629         list_del_init(&rmidi->list);
1630 #ifdef CONFIG_SND_OSSEMUL
1631         if (rmidi->ossreg) {
1632                 if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1633                         snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 0);
1634 #ifdef SNDRV_OSS_INFO_DEV_MIDI
1635                         snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number);
1636 #endif
1637                 }
1638                 if ((int)rmidi->device == amidi_map[rmidi->card->number])
1639                         snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 1);
1640                 rmidi->ossreg = 0;
1641         }
1642 #endif /* CONFIG_SND_OSSEMUL */
1643         snd_unregister_device(SNDRV_DEVICE_TYPE_RAWMIDI, rmidi->card, rmidi->device);
1644         mutex_unlock(&register_mutex);
1645         return 0;
1646 }
1647
1648 /**
1649  * snd_rawmidi_set_ops - set the rawmidi operators
1650  * @rmidi: the rawmidi instance
1651  * @stream: the stream direction, SNDRV_RAWMIDI_STREAM_XXX
1652  * @ops: the operator table
1653  *
1654  * Sets the rawmidi operators for the given stream direction.
1655  */
1656 void snd_rawmidi_set_ops(struct snd_rawmidi *rmidi, int stream,
1657                          struct snd_rawmidi_ops *ops)
1658 {
1659         struct snd_rawmidi_substream *substream;
1660
1661         list_for_each_entry(substream, &rmidi->streams[stream].substreams, list)
1662                 substream->ops = ops;
1663 }
1664
1665 /*
1666  *  ENTRY functions
1667  */
1668
1669 static int __init alsa_rawmidi_init(void)
1670 {
1671
1672         snd_ctl_register_ioctl(snd_rawmidi_control_ioctl);
1673         snd_ctl_register_ioctl_compat(snd_rawmidi_control_ioctl);
1674 #ifdef CONFIG_SND_OSSEMUL
1675         { int i;
1676         /* check device map table */
1677         for (i = 0; i < SNDRV_CARDS; i++) {
1678                 if (midi_map[i] < 0 || midi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1679                         snd_printk(KERN_ERR "invalid midi_map[%d] = %d\n", i, midi_map[i]);
1680                         midi_map[i] = 0;
1681                 }
1682                 if (amidi_map[i] < 0 || amidi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1683                         snd_printk(KERN_ERR "invalid amidi_map[%d] = %d\n", i, amidi_map[i]);
1684                         amidi_map[i] = 1;
1685                 }
1686         }
1687         }
1688 #endif /* CONFIG_SND_OSSEMUL */
1689         return 0;
1690 }
1691
1692 static void __exit alsa_rawmidi_exit(void)
1693 {
1694         snd_ctl_unregister_ioctl(snd_rawmidi_control_ioctl);
1695         snd_ctl_unregister_ioctl_compat(snd_rawmidi_control_ioctl);
1696 }
1697
1698 module_init(alsa_rawmidi_init)
1699 module_exit(alsa_rawmidi_exit)
1700
1701 EXPORT_SYMBOL(snd_rawmidi_output_params);
1702 EXPORT_SYMBOL(snd_rawmidi_input_params);
1703 EXPORT_SYMBOL(snd_rawmidi_drop_output);
1704 EXPORT_SYMBOL(snd_rawmidi_drain_output);
1705 EXPORT_SYMBOL(snd_rawmidi_drain_input);
1706 EXPORT_SYMBOL(snd_rawmidi_receive);
1707 EXPORT_SYMBOL(snd_rawmidi_transmit_empty);
1708 EXPORT_SYMBOL(snd_rawmidi_transmit_peek);
1709 EXPORT_SYMBOL(snd_rawmidi_transmit_ack);
1710 EXPORT_SYMBOL(snd_rawmidi_transmit);
1711 EXPORT_SYMBOL(snd_rawmidi_new);
1712 EXPORT_SYMBOL(snd_rawmidi_set_ops);
1713 EXPORT_SYMBOL(snd_rawmidi_info_select);
1714 EXPORT_SYMBOL(snd_rawmidi_kernel_open);
1715 EXPORT_SYMBOL(snd_rawmidi_kernel_release);
1716 EXPORT_SYMBOL(snd_rawmidi_kernel_read);
1717 EXPORT_SYMBOL(snd_rawmidi_kernel_write);