sound/core/rawmidi.c

   1 /*
   2  *  Abstract layer for MIDI v1.0 stream
   3  *  Copyright (c) by Jaroslav Kysela <perex@suse.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/driver.h>
  23 #include <sound/core.h>
  24 #include <linux/major.h>
  25 #include <linux/init.h>
  26 #include <linux/sched.h>
  27 #include <linux/slab.h>
  28 #include <linux/time.h>
  29 #include <linux/wait.h>
  30 #include <linux/mutex.h>
  31 #include <linux/moduleparam.h>
  32 #include <linux/delay.h>
  33 #include <sound/rawmidi.h>
  34 #include <sound/info.h>
  35 #include <sound/control.h>
  36 #include <sound/minors.h>
  37 #include <sound/initval.h>
  38
  39 MODULE_AUTHOR("Jaroslav Kysela <perex@suse.cz>");
  40 MODULE_DESCRIPTION("Midlevel RawMidi code for ALSA.");
  41 MODULE_LICENSE("GPL");
  42
  43 #ifdef CONFIG_SND_OSSEMUL
  44 static int midi_map[SNDRV_CARDS];
  45 static int amidi_map[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS-1)] = 1};
  46 module_param_array(midi_map, int, NULL, 0444);
  47 MODULE_PARM_DESC(midi_map, "Raw MIDI device number assigned to 1st OSS device.");
  48 module_param_array(amidi_map, int, NULL, 0444);
  49 MODULE_PARM_DESC(amidi_map, "Raw MIDI device number assigned to 2nd OSS device.");
  50 #endif /* CONFIG_SND_OSSEMUL */
  51
  52 static int snd_rawmidi_free(struct snd_rawmidi *rawmidi);
  53 static int snd_rawmidi_dev_free(struct snd_device *device);
  54 static int snd_rawmidi_dev_register(struct snd_device *device);
  55 static int snd_rawmidi_dev_disconnect(struct snd_device *device);
  56
  57 static LIST_HEAD(snd_rawmidi_devices);
  58 static DEFINE_MUTEX(register_mutex);
  59
  60 static struct snd_rawmidi *snd_rawmidi_search(struct snd_card *card, int device)
  61 {
  62         struct snd_rawmidi *rawmidi;
  63
  64         list_for_each_entry(rawmidi, &snd_rawmidi_devices, list)
  65                 if (rawmidi->card == card && rawmidi->device == device)
  66                         return rawmidi;
  67         return NULL;
  68 }
  69
  70 static inline unsigned short snd_rawmidi_file_flags(struct file *file)
  71 {
  72         switch (file->f_mode & (FMODE_READ | FMODE_WRITE)) {
  73         case FMODE_WRITE:
  74                 return SNDRV_RAWMIDI_LFLG_OUTPUT;
  75         case FMODE_READ:
  76                 return SNDRV_RAWMIDI_LFLG_INPUT;
  77         default:
  78                 return SNDRV_RAWMIDI_LFLG_OPEN;
  79         }
  80 }
  81
  82 static inline int snd_rawmidi_ready(struct snd_rawmidi_substream *substream)
  83 {
  84         struct snd_rawmidi_runtime *runtime = substream->runtime;
  85         return runtime->avail >= runtime->avail_min;
  86 }
  87
  88 static inline int snd_rawmidi_ready_append(struct snd_rawmidi_substream *substream,
  89                                            size_t count)
  90 {
  91         struct snd_rawmidi_runtime *runtime = substream->runtime;
  92         return runtime->avail >= runtime->avail_min &&
  93                (!substream->append || runtime->avail >= count);
  94 }
  95
  96 static void snd_rawmidi_input_event_tasklet(unsigned long data)
  97 {
  98         struct snd_rawmidi_substream *substream = (struct snd_rawmidi_substream *)data;
  99         substream->runtime->event(substream);
 100 }
 101
 102 static void snd_rawmidi_output_trigger_tasklet(unsigned long data)
 103 {
 104         struct snd_rawmidi_substream *substream = (struct snd_rawmidi_substream *)data;
 105         substream->ops->trigger(substream, 1);
 106 }
 107
 108 static int snd_rawmidi_runtime_create(struct snd_rawmidi_substream *substream)
 109 {
 110         struct snd_rawmidi_runtime *runtime;
 111
 112         if ((runtime = kzalloc(sizeof(*runtime), GFP_KERNEL)) == NULL)
 113                 return -ENOMEM;
 114         spin_lock_init(&runtime->lock);
 115         init_waitqueue_head(&runtime->sleep);
 116         if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
 117                 tasklet_init(&runtime->tasklet,
 118                              snd_rawmidi_input_event_tasklet,
 119                              (unsigned long)substream);
 120         else
 121                 tasklet_init(&runtime->tasklet,
 122                              snd_rawmidi_output_trigger_tasklet,
 123                              (unsigned long)substream);
 124         runtime->event = NULL;
 125         runtime->buffer_size = PAGE_SIZE;
 126         runtime->avail_min = 1;
 127         if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
 128                 runtime->avail = 0;
 129         else
 130                 runtime->avail = runtime->buffer_size;
 131         if ((runtime->buffer = kmalloc(runtime->buffer_size, GFP_KERNEL)) == NULL) {
 132                 kfree(runtime);
 133                 return -ENOMEM;
 134         }
 135         runtime->appl_ptr = runtime->hw_ptr = 0;
 136         substream->runtime = runtime;
 137         return 0;
 138 }
 139
 140 static int snd_rawmidi_runtime_free(struct snd_rawmidi_substream *substream)
 141 {
 142         struct snd_rawmidi_runtime *runtime = substream->runtime;
 143
 144         kfree(runtime->buffer);
 145         kfree(runtime);
 146         substream->runtime = NULL;
 147         return 0;
 148 }
 149
 150 static inline void snd_rawmidi_output_trigger(struct snd_rawmidi_substream *substream,int up)
 151 {
 152         if (up) {
 153                 tasklet_hi_schedule(&substream->runtime->tasklet);
 154         } else {
 155                 tasklet_kill(&substream->runtime->tasklet);
 156                 substream->ops->trigger(substream, 0);
 157         }
 158 }
 159
 160 static void snd_rawmidi_input_trigger(struct snd_rawmidi_substream *substream, int up)
 161 {
 162         substream->ops->trigger(substream, up);
 163         if (!up && substream->runtime->event)
 164                 tasklet_kill(&substream->runtime->tasklet);
 165 }
 166
 167 int snd_rawmidi_drop_output(struct snd_rawmidi_substream *substream)
 168 {
 169         unsigned long flags;
 170         struct snd_rawmidi_runtime *runtime = substream->runtime;
 171
 172         snd_rawmidi_output_trigger(substream, 0);
 173         runtime->drain = 0;
 174         spin_lock_irqsave(&runtime->lock, flags);
 175         runtime->appl_ptr = runtime->hw_ptr = 0;
 176         runtime->avail = runtime->buffer_size;
 177         spin_unlock_irqrestore(&runtime->lock, flags);
 178         return 0;
 179 }
 180
 181 int snd_rawmidi_drain_output(struct snd_rawmidi_substream *substream)
 182 {
 183         int err;
 184         long timeout;
 185         struct snd_rawmidi_runtime *runtime = substream->runtime;
 186
 187         err = 0;
 188         runtime->drain = 1;
 189         timeout = wait_event_interruptible_timeout(runtime->sleep,
 190                                 (runtime->avail >= runtime->buffer_size),
 191                                 10*HZ);
 192         if (signal_pending(current))
 193                 err = -ERESTARTSYS;
 194         if (runtime->avail < runtime->buffer_size && !timeout) {
 195                 snd_printk(KERN_WARNING "rawmidi drain error (avail = %li, buffer_size = %li)\n", (long)runtime->avail, (long)runtime->buffer_size);
 196                 err = -EIO;
 197         }
 198         runtime->drain = 0;
 199         if (err != -ERESTARTSYS) {
 200                 /* we need wait a while to make sure that Tx FIFOs are empty */
 201                 if (substream->ops->drain)
 202                         substream->ops->drain(substream);
 203                 else
 204                         msleep(50);
 205                 snd_rawmidi_drop_output(substream);
 206         }
 207         return err;
 208 }
 209
 210 int snd_rawmidi_drain_input(struct snd_rawmidi_substream *substream)
 211 {
 212         unsigned long flags;
 213         struct snd_rawmidi_runtime *runtime = substream->runtime;
 214
 215         snd_rawmidi_input_trigger(substream, 0);
 216         runtime->drain = 0;
 217         spin_lock_irqsave(&runtime->lock, flags);
 218         runtime->appl_ptr = runtime->hw_ptr = 0;
 219         runtime->avail = 0;
 220         spin_unlock_irqrestore(&runtime->lock, flags);
 221         return 0;
 222 }
 223
 224 int snd_rawmidi_kernel_open(struct snd_card *card, int device, int subdevice,
 225                             int mode, struct snd_rawmidi_file * rfile)
 226 {
 227         struct snd_rawmidi *rmidi;
 228         struct list_head *list1, *list2;
 229         struct snd_rawmidi_substream *sinput = NULL, *soutput = NULL;
 230         struct snd_rawmidi_runtime *input = NULL, *output = NULL;
 231         int err;
 232
 233         if (rfile)
 234                 rfile->input = rfile->output = NULL;
 235         mutex_lock(&register_mutex);
 236         rmidi = snd_rawmidi_search(card, device);
 237         mutex_unlock(&register_mutex);
 238         if (rmidi == NULL) {
 239                 err = -ENODEV;
 240                 goto __error1;
 241         }
 242         if (!try_module_get(rmidi->card->module)) {
 243                 err = -EFAULT;
 244                 goto __error1;
 245         }
 246         if (!(mode & SNDRV_RAWMIDI_LFLG_NOOPENLOCK))
 247                 mutex_lock(&rmidi->open_mutex);
 248         if (mode & SNDRV_RAWMIDI_LFLG_INPUT) {
 249                 if (!(rmidi->info_flags & SNDRV_RAWMIDI_INFO_INPUT)) {
 250                         err = -ENXIO;
 251                         goto __error;
 252                 }
 253                 if (subdevice >= 0 && (unsigned int)subdevice >= rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substream_count) {
 254                         err = -ENODEV;
 255                         goto __error;
 256                 }
 257                 if (rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substream_opened >=
 258                     rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substream_count) {
 259                         err = -EAGAIN;
 260                         goto __error;
 261                 }
 262         }
 263         if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) {
 264                 if (!(rmidi->info_flags & SNDRV_RAWMIDI_INFO_OUTPUT)) {
 265                         err = -ENXIO;
 266                         goto __error;
 267                 }
 268                 if (subdevice >= 0 && (unsigned int)subdevice >= rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substream_count) {
 269                         err = -ENODEV;
 270                         goto __error;
 271                 }
 272                 if (rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substream_opened >=
 273                     rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substream_count) {
 274                         err = -EAGAIN;
 275                         goto __error;
 276                 }
 277         }
 278         list1 = rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams.next;
 279         while (1) {
 280                 if (list1 == &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams) {
 281                         sinput = NULL;
 282                         if (mode & SNDRV_RAWMIDI_LFLG_INPUT) {
 283                                 err = -EAGAIN;
 284                                 goto __error;
 285                         }
 286                         break;
 287                 }
 288                 sinput = list_entry(list1, struct snd_rawmidi_substream, list);
 289                 if ((mode & SNDRV_RAWMIDI_LFLG_INPUT) && sinput->opened)
 290                         goto __nexti;
 291                 if (subdevice < 0 || (subdevice >= 0 && subdevice == sinput->number))
 292                         break;
 293               __nexti:
 294                 list1 = list1->next;
 295         }
 296         list2 = rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams.next;
 297         while (1) {
 298                 if (list2 == &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams) {
 299                         soutput = NULL;
 300                         if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) {
 301                                 err = -EAGAIN;
 302                                 goto __error;
 303                         }
 304                         break;
 305                 }
 306                 soutput = list_entry(list2, struct snd_rawmidi_substream, list);
 307                 if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) {
 308                         if (mode & SNDRV_RAWMIDI_LFLG_APPEND) {
 309                                 if (soutput->opened && !soutput->append)
 310                                         goto __nexto;
 311                         } else {
 312                                 if (soutput->opened)
 313                                         goto __nexto;
 314                         }
 315                 }
 316                 if (subdevice < 0 || (subdevice >= 0 && subdevice == soutput->number))
 317                         break;
 318               __nexto:
 319                 list2 = list2->next;
 320         }
 321         if (mode & SNDRV_RAWMIDI_LFLG_INPUT) {
 322                 if ((err = snd_rawmidi_runtime_create(sinput)) < 0)
 323                         goto __error;
 324                 input = sinput->runtime;
 325                 if ((err = sinput->ops->open(sinput)) < 0)
 326                         goto __error;
 327                 sinput->opened = 1;
 328                 rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substream_opened++;
 329         } else {
 330                 sinput = NULL;
 331         }
 332         if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) {
 333                 if (soutput->opened)
 334                         goto __skip_output;
 335                 if ((err = snd_rawmidi_runtime_create(soutput)) < 0) {
 336                         if (mode & SNDRV_RAWMIDI_LFLG_INPUT)
 337                                 sinput->ops->close(sinput);
 338                         goto __error;
 339                 }
 340                 output = soutput->runtime;
 341                 if ((err = soutput->ops->open(soutput)) < 0) {
 342                         if (mode & SNDRV_RAWMIDI_LFLG_INPUT)
 343                                 sinput->ops->close(sinput);
 344                         goto __error;
 345                 }
 346               __skip_output:
 347                 soutput->opened = 1;
 348                 if (mode & SNDRV_RAWMIDI_LFLG_APPEND)
 349                         soutput->append = 1;
 350                 if (soutput->use_count++ == 0)
 351                         soutput->active_sensing = 1;
 352                 rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substream_opened++;
 353         } else {
 354                 soutput = NULL;
 355         }
 356         if (!(mode & SNDRV_RAWMIDI_LFLG_NOOPENLOCK))
 357                 mutex_unlock(&rmidi->open_mutex);
 358         if (rfile) {
 359                 rfile->rmidi = rmidi;
 360                 rfile->input = sinput;
 361                 rfile->output = soutput;
 362         }
 363         return 0;
 364
 365       __error:
 366         if (input != NULL)
 367                 snd_rawmidi_runtime_free(sinput);
 368         if (output != NULL)
 369                 snd_rawmidi_runtime_free(soutput);
 370         module_put(rmidi->card->module);
 371         if (!(mode & SNDRV_RAWMIDI_LFLG_NOOPENLOCK))
 372                 mutex_unlock(&rmidi->open_mutex);
 373       __error1:
 374         return err;
 375 }
 376
 377 static int snd_rawmidi_open(struct inode *inode, struct file *file)
 378 {
 379         int maj = imajor(inode);
 380         struct snd_card *card;
 381         int subdevice;
 382         unsigned short fflags;
 383         int err;
 384         struct snd_rawmidi *rmidi;
 385         struct snd_rawmidi_file *rawmidi_file;
 386         wait_queue_t wait;
 387         struct snd_ctl_file *kctl;
 388
 389         if (maj == snd_major) {
 390                 rmidi = snd_lookup_minor_data(iminor(inode),
 391                                               SNDRV_DEVICE_TYPE_RAWMIDI);
 392 #ifdef CONFIG_SND_OSSEMUL
 393         } else if (maj == SOUND_MAJOR) {
 394                 rmidi = snd_lookup_oss_minor_data(iminor(inode),
 395                                                   SNDRV_OSS_DEVICE_TYPE_MIDI);
 396 #endif
 397         } else
 398                 return -ENXIO;
 399
 400         if (rmidi == NULL)
 401                 return -ENODEV;
 402         if ((file->f_flags & O_APPEND) && !(file->f_flags & O_NONBLOCK))
 403                 return -EINVAL;         /* invalid combination */
 404         card = rmidi->card;
 405         err = snd_card_file_add(card, file);
 406         if (err < 0)
 407                 return -ENODEV;
 408         fflags = snd_rawmidi_file_flags(file);
 409         if ((file->f_flags & O_APPEND) || maj == SOUND_MAJOR) /* OSS emul? */
 410                 fflags |= SNDRV_RAWMIDI_LFLG_APPEND;
 411         fflags |= SNDRV_RAWMIDI_LFLG_NOOPENLOCK;
 412         rawmidi_file = kmalloc(sizeof(*rawmidi_file), GFP_KERNEL);
 413         if (rawmidi_file == NULL) {
 414                 snd_card_file_remove(card, file);
 415                 return -ENOMEM;
 416         }
 417         init_waitqueue_entry(&wait, current);
 418         add_wait_queue(&rmidi->open_wait, &wait);
 419         mutex_lock(&rmidi->open_mutex);
 420         while (1) {
 421                 subdevice = -1;
 422                 down_read(&card->controls_rwsem);
 423                 list_for_each_entry(kctl, &card->ctl_files, list) {
 424                         if (kctl->pid == current->pid) {
 425                                 subdevice = kctl->prefer_rawmidi_subdevice;
 426                                 if (subdevice != -1)
 427                                         break;
 428                         }
 429                 }
 430                 up_read(&card->controls_rwsem);
 431                 err = snd_rawmidi_kernel_open(rmidi->card, rmidi->device,
 432                                               subdevice, fflags, rawmidi_file);
 433                 if (err >= 0)
 434                         break;
 435                 if (err == -EAGAIN) {
 436                         if (file->f_flags & O_NONBLOCK) {
 437                                 err = -EBUSY;
 438                                 break;
 439                         }
 440                 } else
 441                         break;
 442                 set_current_state(TASK_INTERRUPTIBLE);
 443                 mutex_unlock(&rmidi->open_mutex);
 444                 schedule();
 445                 mutex_lock(&rmidi->open_mutex);
 446                 if (signal_pending(current)) {
 447                         err = -ERESTARTSYS;
 448                         break;
 449                 }
 450         }
 451 #ifdef CONFIG_SND_OSSEMUL
 452         if (rawmidi_file->input && rawmidi_file->input->runtime)
 453                 rawmidi_file->input->runtime->oss = (maj == SOUND_MAJOR);
 454         if (rawmidi_file->output && rawmidi_file->output->runtime)
 455                 rawmidi_file->output->runtime->oss = (maj == SOUND_MAJOR);
 456 #endif
 457         remove_wait_queue(&rmidi->open_wait, &wait);
 458         if (err >= 0) {
 459                 file->private_data = rawmidi_file;
 460         } else {
 461                 snd_card_file_remove(card, file);
 462                 kfree(rawmidi_file);
 463         }
 464         mutex_unlock(&rmidi->open_mutex);
 465         return err;
 466 }
 467
 468 int snd_rawmidi_kernel_release(struct snd_rawmidi_file * rfile)
 469 {
 470         struct snd_rawmidi *rmidi;
 471         struct snd_rawmidi_substream *substream;
 472         struct snd_rawmidi_runtime *runtime;
 473
 474         snd_assert(rfile != NULL, return -ENXIO);
 475         snd_assert(rfile->input != NULL || rfile->output != NULL, return -ENXIO);
 476         rmidi = rfile->rmidi;
 477         mutex_lock(&rmidi->open_mutex);
 478         if (rfile->input != NULL) {
 479                 substream = rfile->input;
 480                 rfile->input = NULL;
 481                 runtime = substream->runtime;
 482                 snd_rawmidi_input_trigger(substream, 0);
 483                 substream->ops->close(substream);
 484                 if (runtime->private_free != NULL)
 485                         runtime->private_free(substream);
 486                 snd_rawmidi_runtime_free(substream);
 487                 substream->opened = 0;
 488                 rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substream_opened--;
 489         }
 490         if (rfile->output != NULL) {
 491                 substream = rfile->output;
 492                 rfile->output = NULL;
 493                 if (--substream->use_count == 0) {
 494                         runtime = substream->runtime;
 495                         if (substream->active_sensing) {
 496                                 unsigned char buf = 0xfe;
 497                                 /* sending single active sensing message to shut the device up */
 498                                 snd_rawmidi_kernel_write(substream, &buf, 1);
 499                         }
 500                         if (snd_rawmidi_drain_output(substream) == -ERESTARTSYS)
 501                                 snd_rawmidi_output_trigger(substream, 0);
 502                         substream->ops->close(substream);
 503                         if (runtime->private_free != NULL)
 504                                 runtime->private_free(substream);
 505                         snd_rawmidi_runtime_free(substream);
 506                         substream->opened = 0;
 507                         substream->append = 0;
 508                 }
 509                 rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substream_opened--;
 510         }
 511         mutex_unlock(&rmidi->open_mutex);
 512         module_put(rmidi->card->module);
 513         return 0;
 514 }
 515
 516 static int snd_rawmidi_release(struct inode *inode, struct file *file)
 517 {
 518         struct snd_rawmidi_file *rfile;
 519         struct snd_rawmidi *rmidi;
 520         int err;
 521
 522         rfile = file->private_data;
 523         err = snd_rawmidi_kernel_release(rfile);
 524         rmidi = rfile->rmidi;
 525         wake_up(&rmidi->open_wait);
 526         kfree(rfile);
 527         snd_card_file_remove(rmidi->card, file);
 528         return err;
 529 }
 530
 531 static int snd_rawmidi_info(struct snd_rawmidi_substream *substream,
 532                             struct snd_rawmidi_info *info)
 533 {
 534         struct snd_rawmidi *rmidi;
 535
 536         if (substream == NULL)
 537                 return -ENODEV;
 538         rmidi = substream->rmidi;
 539         memset(info, 0, sizeof(*info));
 540         info->card = rmidi->card->number;
 541         info->device = rmidi->device;
 542         info->subdevice = substream->number;
 543         info->stream = substream->stream;
 544         info->flags = rmidi->info_flags;
 545         strcpy(info->id, rmidi->id);
 546         strcpy(info->name, rmidi->name);
 547         strcpy(info->subname, substream->name);
 548         info->subdevices_count = substream->pstr->substream_count;
 549         info->subdevices_avail = (substream->pstr->substream_count -
 550                                   substream->pstr->substream_opened);
 551         return 0;
 552 }
 553
 554 static int snd_rawmidi_info_user(struct snd_rawmidi_substream *substream,
 555                                  struct snd_rawmidi_info __user * _info)
 556 {
 557         struct snd_rawmidi_info info;
 558         int err;
 559         if ((err = snd_rawmidi_info(substream, &info)) < 0)
 560                 return err;
 561         if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
 562                 return -EFAULT;
 563         return 0;
 564 }
 565
 566 int snd_rawmidi_info_select(struct snd_card *card, struct snd_rawmidi_info *info)
 567 {
 568         struct snd_rawmidi *rmidi;
 569         struct snd_rawmidi_str *pstr;
 570         struct snd_rawmidi_substream *substream;
 571
 572         mutex_lock(&register_mutex);
 573         rmidi = snd_rawmidi_search(card, info->device);
 574         mutex_unlock(&register_mutex);
 575         if (!rmidi)
 576                 return -ENXIO;
 577         if (info->stream < 0 || info->stream > 1)
 578                 return -EINVAL;
 579         pstr = &rmidi->streams[info->stream];
 580         if (pstr->substream_count == 0)
 581                 return -ENOENT;
 582         if (info->subdevice >= pstr->substream_count)
 583                 return -ENXIO;
 584         list_for_each_entry(substream, &pstr->substreams, list) {
 585                 if ((unsigned int)substream->number == info->subdevice)
 586                         return snd_rawmidi_info(substream, info);
 587         }
 588         return -ENXIO;
 589 }
 590
 591 static int snd_rawmidi_info_select_user(struct snd_card *card,
 592                                         struct snd_rawmidi_info __user *_info)
 593 {
 594         int err;
 595         struct snd_rawmidi_info info;
 596         if (get_user(info.device, &_info->device))
 597                 return -EFAULT;
 598         if (get_user(info.stream, &_info->stream))
 599                 return -EFAULT;
 600         if (get_user(info.subdevice, &_info->subdevice))
 601                 return -EFAULT;
 602         if ((err = snd_rawmidi_info_select(card, &info)) < 0)
 603                 return err;
 604         if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
 605                 return -EFAULT;
 606         return 0;
 607 }
 608
 609 int snd_rawmidi_output_params(struct snd_rawmidi_substream *substream,
 610                               struct snd_rawmidi_params * params)
 611 {
 612         char *newbuf;
 613         struct snd_rawmidi_runtime *runtime = substream->runtime;
 614
 615         if (substream->append && substream->use_count > 1)
 616                 return -EBUSY;
 617         snd_rawmidi_drain_output(substream);
 618         if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L) {
 619                 return -EINVAL;
 620         }
 621         if (params->avail_min < 1 || params->avail_min > params->buffer_size) {
 622                 return -EINVAL;
 623         }
 624         if (params->buffer_size != runtime->buffer_size) {
 625                 newbuf = kmalloc(params->buffer_size, GFP_KERNEL);
 626                 if (!newbuf)
 627                         return -ENOMEM;
 628                 kfree(runtime->buffer);
 629                 runtime->buffer = newbuf;
 630                 runtime->buffer_size = params->buffer_size;
 631                 runtime->avail = runtime->buffer_size;
 632         }
 633         runtime->avail_min = params->avail_min;
 634         substream->active_sensing = !params->no_active_sensing;
 635         return 0;
 636 }
 637
 638 int snd_rawmidi_input_params(struct snd_rawmidi_substream *substream,
 639                              struct snd_rawmidi_params * params)
 640 {
 641         char *newbuf;
 642         struct snd_rawmidi_runtime *runtime = substream->runtime;
 643
 644         snd_rawmidi_drain_input(substream);
 645         if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L) {
 646                 return -EINVAL;
 647         }
 648         if (params->avail_min < 1 || params->avail_min > params->buffer_size) {
 649                 return -EINVAL;
 650         }
 651         if (params->buffer_size != runtime->buffer_size) {
 652                 newbuf = kmalloc(params->buffer_size, GFP_KERNEL);
 653                 if (!newbuf)
 654                         return -ENOMEM;
 655                 kfree(runtime->buffer);
 656                 runtime->buffer = newbuf;
 657                 runtime->buffer_size = params->buffer_size;
 658         }
 659         runtime->avail_min = params->avail_min;
 660         return 0;
 661 }
 662
 663 static int snd_rawmidi_output_status(struct snd_rawmidi_substream *substream,
 664                                      struct snd_rawmidi_status * status)
 665 {
 666         struct snd_rawmidi_runtime *runtime = substream->runtime;
 667
 668         memset(status, 0, sizeof(*status));
 669         status->stream = SNDRV_RAWMIDI_STREAM_OUTPUT;
 670         spin_lock_irq(&runtime->lock);
 671         status->avail = runtime->avail;
 672         spin_unlock_irq(&runtime->lock);
 673         return 0;
 674 }
 675
 676 static int snd_rawmidi_input_status(struct snd_rawmidi_substream *substream,
 677                                     struct snd_rawmidi_status * status)
 678 {
 679         struct snd_rawmidi_runtime *runtime = substream->runtime;
 680
 681         memset(status, 0, sizeof(*status));
 682         status->stream = SNDRV_RAWMIDI_STREAM_INPUT;
 683         spin_lock_irq(&runtime->lock);
 684         status->avail = runtime->avail;
 685         status->xruns = runtime->xruns;
 686         runtime->xruns = 0;
 687         spin_unlock_irq(&runtime->lock);
 688         return 0;
 689 }
 690
 691 static long snd_rawmidi_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 692 {
 693         struct snd_rawmidi_file *rfile;
 694         void __user *argp = (void __user *)arg;
 695
 696         rfile = file->private_data;
 697         if (((cmd >> 8) & 0xff) != 'W')
 698                 return -ENOTTY;
 699         switch (cmd) {
 700         case SNDRV_RAWMIDI_IOCTL_PVERSION:
 701                 return put_user(SNDRV_RAWMIDI_VERSION, (int __user *)argp) ? -EFAULT : 0;
 702         case SNDRV_RAWMIDI_IOCTL_INFO:
 703         {
 704                 int stream;
 705                 struct snd_rawmidi_info __user *info = argp;
 706                 if (get_user(stream, &info->stream))
 707                         return -EFAULT;
 708                 switch (stream) {
 709                 case SNDRV_RAWMIDI_STREAM_INPUT:
 710                         return snd_rawmidi_info_user(rfile->input, info);
 711                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
 712                         return snd_rawmidi_info_user(rfile->output, info);
 713                 default:
 714                         return -EINVAL;
 715                 }
 716         }
 717         case SNDRV_RAWMIDI_IOCTL_PARAMS:
 718         {
 719                 struct snd_rawmidi_params params;
 720                 if (copy_from_user(&params, argp, sizeof(struct snd_rawmidi_params)))
 721                         return -EFAULT;
 722                 switch (params.stream) {
 723                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
 724                         if (rfile->output == NULL)
 725                                 return -EINVAL;
 726                         return snd_rawmidi_output_params(rfile->output, &params);
 727                 case SNDRV_RAWMIDI_STREAM_INPUT:
 728                         if (rfile->input == NULL)
 729                                 return -EINVAL;
 730                         return snd_rawmidi_input_params(rfile->input, &params);
 731                 default:
 732                         return -EINVAL;
 733                 }
 734         }
 735         case SNDRV_RAWMIDI_IOCTL_STATUS:
 736         {
 737                 int err = 0;
 738                 struct snd_rawmidi_status status;
 739                 if (copy_from_user(&status, argp, sizeof(struct snd_rawmidi_status)))
 740                         return -EFAULT;
 741                 switch (status.stream) {
 742                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
 743                         if (rfile->output == NULL)
 744                                 return -EINVAL;
 745                         err = snd_rawmidi_output_status(rfile->output, &status);
 746                         break;
 747                 case SNDRV_RAWMIDI_STREAM_INPUT:
 748                         if (rfile->input == NULL)
 749                                 return -EINVAL;
 750                         err = snd_rawmidi_input_status(rfile->input, &status);
 751                         break;
 752                 default:
 753                         return -EINVAL;
 754                 }
 755                 if (err < 0)
 756                         return err;
 757                 if (copy_to_user(argp, &status, sizeof(struct snd_rawmidi_status)))
 758                         return -EFAULT;
 759                 return 0;
 760         }
 761         case SNDRV_RAWMIDI_IOCTL_DROP:
 762         {
 763                 int val;
 764                 if (get_user(val, (int __user *) argp))
 765                         return -EFAULT;
 766                 switch (val) {
 767                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
 768                         if (rfile->output == NULL)
 769                                 return -EINVAL;
 770                         return snd_rawmidi_drop_output(rfile->output);
 771                 default:
 772                         return -EINVAL;
 773                 }
 774         }
 775         case SNDRV_RAWMIDI_IOCTL_DRAIN:
 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_drain_output(rfile->output);
 785                 case SNDRV_RAWMIDI_STREAM_INPUT:
 786                         if (rfile->input == NULL)
 787                                 return -EINVAL;
 788                         return snd_rawmidi_drain_input(rfile->input);
 789                 default:
 790                         return -EINVAL;
 791                 }
 792         }
 793 #ifdef CONFIG_SND_DEBUG
 794         default:
 795                 snd_printk(KERN_WARNING "rawmidi: unknown command = 0x%x\n", cmd);
 796 #endif
 797         }
 798         return -ENOTTY;
 799 }
 800
 801 static int snd_rawmidi_control_ioctl(struct snd_card *card,
 802                                      struct snd_ctl_file *control,
 803                                      unsigned int cmd,
 804                                      unsigned long arg)
 805 {
 806         void __user *argp = (void __user *)arg;
 807
 808         switch (cmd) {
 809         case SNDRV_CTL_IOCTL_RAWMIDI_NEXT_DEVICE:
 810         {
 811                 int device;
 812
 813                 if (get_user(device, (int __user *)argp))
 814                         return -EFAULT;
 815                 mutex_lock(&register_mutex);
 816                 device = device < 0 ? 0 : device + 1;
 817                 while (device < SNDRV_RAWMIDI_DEVICES) {
 818                         if (snd_rawmidi_search(card, device))
 819                                 break;
 820                         device++;
 821                 }
 822                 if (device == SNDRV_RAWMIDI_DEVICES)
 823                         device = -1;
 824                 mutex_unlock(&register_mutex);
 825                 if (put_user(device, (int __user *)argp))
 826                         return -EFAULT;
 827                 return 0;
 828         }
 829         case SNDRV_CTL_IOCTL_RAWMIDI_PREFER_SUBDEVICE:
 830         {
 831                 int val;
 832
 833                 if (get_user(val, (int __user *)argp))
 834                         return -EFAULT;
 835                 control->prefer_rawmidi_subdevice = val;
 836                 return 0;
 837         }
 838         case SNDRV_CTL_IOCTL_RAWMIDI_INFO:
 839                 return snd_rawmidi_info_select_user(card, argp);
 840         }
 841         return -ENOIOCTLCMD;
 842 }
 843
 844 /**
 845  * snd_rawmidi_receive - receive the input data from the device
 846  * @substream: the rawmidi substream
 847  * @buffer: the buffer pointer
 848  * @count: the data size to read
 849  *
 850  * Reads the data from the internal buffer.
 851  *
 852  * Returns the size of read data, or a negative error code on failure.
 853  */
 854 int snd_rawmidi_receive(struct snd_rawmidi_substream *substream,
 855                         const unsigned char *buffer, int count)
 856 {
 857         unsigned long flags;
 858         int result = 0, count1;
 859         struct snd_rawmidi_runtime *runtime = substream->runtime;
 860
 861         if (runtime->buffer == NULL) {
 862                 snd_printd("snd_rawmidi_receive: input is not active!!!\n");
 863                 return -EINVAL;
 864         }
 865         spin_lock_irqsave(&runtime->lock, flags);
 866         if (count == 1) {       /* special case, faster code */
 867                 substream->bytes++;
 868                 if (runtime->avail < runtime->buffer_size) {
 869                         runtime->buffer[runtime->hw_ptr++] = buffer[0];
 870                         runtime->hw_ptr %= runtime->buffer_size;
 871                         runtime->avail++;
 872                         result++;
 873                 } else {
 874                         runtime->xruns++;
 875                 }
 876         } else {
 877                 substream->bytes += count;
 878                 count1 = runtime->buffer_size - runtime->hw_ptr;
 879                 if (count1 > count)
 880                         count1 = count;
 881                 if (count1 > (int)(runtime->buffer_size - runtime->avail))
 882                         count1 = runtime->buffer_size - runtime->avail;
 883                 memcpy(runtime->buffer + runtime->hw_ptr, buffer, count1);
 884                 runtime->hw_ptr += count1;
 885                 runtime->hw_ptr %= runtime->buffer_size;
 886                 runtime->avail += count1;
 887                 count -= count1;
 888                 result += count1;
 889                 if (count > 0) {
 890                         buffer += count1;
 891                         count1 = count;
 892                         if (count1 > (int)(runtime->buffer_size - runtime->avail)) {
 893                                 count1 = runtime->buffer_size - runtime->avail;
 894                                 runtime->xruns += count - count1;
 895                         }
 896                         if (count1 > 0) {
 897                                 memcpy(runtime->buffer, buffer, count1);
 898                                 runtime->hw_ptr = count1;
 899                                 runtime->avail += count1;
 900                                 result += count1;
 901                         }
 902                 }
 903         }
 904         if (result > 0) {
 905                 if (runtime->event)
 906                         tasklet_hi_schedule(&runtime->tasklet);
 907                 else if (snd_rawmidi_ready(substream))
 908                         wake_up(&runtime->sleep);
 909         }
 910         spin_unlock_irqrestore(&runtime->lock, flags);
 911         return result;
 912 }
 913
 914 static long snd_rawmidi_kernel_read1(struct snd_rawmidi_substream *substream,
 915                                      unsigned char *buf, long count, int kernel)
 916 {
 917         unsigned long flags;
 918         long result = 0, count1;
 919         struct snd_rawmidi_runtime *runtime = substream->runtime;
 920
 921         while (count > 0 && runtime->avail) {
 922                 count1 = runtime->buffer_size - runtime->appl_ptr;
 923                 if (count1 > count)
 924                         count1 = count;
 925                 spin_lock_irqsave(&runtime->lock, flags);
 926                 if (count1 > (int)runtime->avail)
 927                         count1 = runtime->avail;
 928                 if (kernel) {
 929                         memcpy(buf + result, runtime->buffer + runtime->appl_ptr, count1);
 930                 } else {
 931                         spin_unlock_irqrestore(&runtime->lock, flags);
 932                         if (copy_to_user((char __user *)buf + result,
 933                                          runtime->buffer + runtime->appl_ptr, count1)) {
 934                                 return result > 0 ? result : -EFAULT;
 935                         }
 936                         spin_lock_irqsave(&runtime->lock, flags);
 937                 }
 938                 runtime->appl_ptr += count1;
 939                 runtime->appl_ptr %= runtime->buffer_size;
 940                 runtime->avail -= count1;
 941                 spin_unlock_irqrestore(&runtime->lock, flags);
 942                 result += count1;
 943                 count -= count1;
 944         }
 945         return result;
 946 }
 947
 948 long snd_rawmidi_kernel_read(struct snd_rawmidi_substream *substream,
 949                              unsigned char *buf, long count)
 950 {
 951         snd_rawmidi_input_trigger(substream, 1);
 952         return snd_rawmidi_kernel_read1(substream, buf, count, 1);
 953 }
 954
 955 static ssize_t snd_rawmidi_read(struct file *file, char __user *buf, size_t count,
 956                                 loff_t *offset)
 957 {
 958         long result;
 959         int count1;
 960         struct snd_rawmidi_file *rfile;
 961         struct snd_rawmidi_substream *substream;
 962         struct snd_rawmidi_runtime *runtime;
 963
 964         rfile = file->private_data;
 965         substream = rfile->input;
 966         if (substream == NULL)
 967                 return -EIO;
 968         runtime = substream->runtime;
 969         snd_rawmidi_input_trigger(substream, 1);
 970         result = 0;
 971         while (count > 0) {
 972                 spin_lock_irq(&runtime->lock);
 973                 while (!snd_rawmidi_ready(substream)) {
 974                         wait_queue_t wait;
 975                         if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
 976                                 spin_unlock_irq(&runtime->lock);
 977                                 return result > 0 ? result : -EAGAIN;
 978                         }
 979                         init_waitqueue_entry(&wait, current);
 980                         add_wait_queue(&runtime->sleep, &wait);
 981                         set_current_state(TASK_INTERRUPTIBLE);
 982                         spin_unlock_irq(&runtime->lock);
 983                         schedule();
 984                         remove_wait_queue(&runtime->sleep, &wait);
 985                         if (signal_pending(current))
 986                                 return result > 0 ? result : -ERESTARTSYS;
 987                         if (!runtime->avail)
 988                                 return result > 0 ? result : -EIO;
 989                         spin_lock_irq(&runtime->lock);
 990                 }
 991                 spin_unlock_irq(&runtime->lock);
 992                 count1 = snd_rawmidi_kernel_read1(substream,
 993                                                   (unsigned char __force *)buf,
 994                                                   count, 0);
 995                 if (count1 < 0)
 996                         return result > 0 ? result : count1;
 997                 result += count1;
 998                 buf += count1;
 999                 count -= count1;
1000         }
1001         return result;
1002 }
1003
1004 /**
1005  * snd_rawmidi_transmit_empty - check whether the output buffer is empty
1006  * @substream: the rawmidi substream
1007  *
1008  * Returns 1 if the internal output buffer is empty, 0 if not.
1009  */
1010 int snd_rawmidi_transmit_empty(struct snd_rawmidi_substream *substream)
1011 {
1012         struct snd_rawmidi_runtime *runtime = substream->runtime;
1013         int result;
1014         unsigned long flags;
1015
1016         if (runtime->buffer == NULL) {
1017                 snd_printd("snd_rawmidi_transmit_empty: output is not active!!!\n");
1018                 return 1;
1019         }
1020         spin_lock_irqsave(&runtime->lock, flags);
1021         result = runtime->avail >= runtime->buffer_size;
1022         spin_unlock_irqrestore(&runtime->lock, flags);
1023         return result;
1024 }
1025
1026 /**
1027  * snd_rawmidi_transmit_peek - copy data from the internal buffer
1028  * @substream: the rawmidi substream
1029  * @buffer: the buffer pointer
1030  * @count: data size to transfer
1031  *
1032  * Copies data from the internal output buffer to the given buffer.
1033  *
1034  * Call this in the interrupt handler when the midi output is ready,
1035  * and call snd_rawmidi_transmit_ack() after the transmission is
1036  * finished.
1037  *
1038  * Returns the size of copied data, or a negative error code on failure.
1039  */
1040 int snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
1041                               unsigned char *buffer, int count)
1042 {
1043         unsigned long flags;
1044         int result, count1;
1045         struct snd_rawmidi_runtime *runtime = substream->runtime;
1046
1047         if (runtime->buffer == NULL) {
1048                 snd_printd("snd_rawmidi_transmit_peek: output is not active!!!\n");
1049                 return -EINVAL;
1050         }
1051         result = 0;
1052         spin_lock_irqsave(&runtime->lock, flags);
1053         if (runtime->avail >= runtime->buffer_size) {
1054                 /* warning: lowlevel layer MUST trigger down the hardware */
1055                 goto __skip;
1056         }
1057         if (count == 1) {       /* special case, faster code */
1058                 *buffer = runtime->buffer[runtime->hw_ptr];
1059                 result++;
1060         } else {
1061                 count1 = runtime->buffer_size - runtime->hw_ptr;
1062                 if (count1 > count)
1063                         count1 = count;
1064                 if (count1 > (int)(runtime->buffer_size - runtime->avail))
1065                         count1 = runtime->buffer_size - runtime->avail;
1066                 memcpy(buffer, runtime->buffer + runtime->hw_ptr, count1);
1067                 count -= count1;
1068                 result += count1;
1069                 if (count > 0) {
1070                         if (count > (int)(runtime->buffer_size - runtime->avail - count1))
1071                                 count = runtime->buffer_size - runtime->avail - count1;
1072                         memcpy(buffer + count1, runtime->buffer, count);
1073                         result += count;
1074                 }
1075         }
1076       __skip:
1077         spin_unlock_irqrestore(&runtime->lock, flags);
1078         return result;
1079 }
1080
1081 /**
1082  * snd_rawmidi_transmit_ack - acknowledge the transmission
1083  * @substream: the rawmidi substream
1084  * @count: the tranferred count
1085  *
1086  * Advances the hardware pointer for the internal output buffer with
1087  * the given size and updates the condition.
1088  * Call after the transmission is finished.
1089  *
1090  * Returns the advanced size if successful, or a negative error code on failure.
1091  */
1092 int snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count)
1093 {
1094         unsigned long flags;
1095         struct snd_rawmidi_runtime *runtime = substream->runtime;
1096
1097         if (runtime->buffer == NULL) {
1098                 snd_printd("snd_rawmidi_transmit_ack: output is not active!!!\n");
1099                 return -EINVAL;
1100         }
1101         spin_lock_irqsave(&runtime->lock, flags);
1102         snd_assert(runtime->avail + count <= runtime->buffer_size, );
1103         runtime->hw_ptr += count;
1104         runtime->hw_ptr %= runtime->buffer_size;
1105         runtime->avail += count;
1106         substream->bytes += count;
1107         if (count > 0) {
1108                 if (runtime->drain || snd_rawmidi_ready(substream))
1109                         wake_up(&runtime->sleep);
1110         }
1111         spin_unlock_irqrestore(&runtime->lock, flags);
1112         return count;
1113 }
1114
1115 /**
1116  * snd_rawmidi_transmit - copy from the buffer to the device
1117  * @substream: the rawmidi substream
1118  * @buffer: the buffer pointer
1119  * @count: the data size to transfer
1120  *
1121  * Copies data from the buffer to the device and advances the pointer.
1122  *
1123  * Returns the copied size if successful, or a negative error code on failure.
1124  */
1125 int snd_rawmidi_transmit(struct snd_rawmidi_substream *substream,
1126                          unsigned char *buffer, int count)
1127 {
1128         count = snd_rawmidi_transmit_peek(substream, buffer, count);
1129         if (count < 0)
1130                 return count;
1131         return snd_rawmidi_transmit_ack(substream, count);
1132 }
1133
1134 static long snd_rawmidi_kernel_write1(struct snd_rawmidi_substream *substream,
1135                                       const unsigned char *buf, long count, int kernel)
1136 {
1137         unsigned long flags;
1138         long count1, result;
1139         struct snd_rawmidi_runtime *runtime = substream->runtime;
1140
1141         snd_assert(buf != NULL, return -EINVAL);
1142         snd_assert(runtime->buffer != NULL, return -EINVAL);
1143
1144         result = 0;
1145         spin_lock_irqsave(&runtime->lock, flags);
1146         if (substream->append) {
1147                 if ((long)runtime->avail < count) {
1148                         spin_unlock_irqrestore(&runtime->lock, flags);
1149                         return -EAGAIN;
1150                 }
1151         }
1152         while (count > 0 && runtime->avail > 0) {
1153                 count1 = runtime->buffer_size - runtime->appl_ptr;
1154                 if (count1 > count)
1155                         count1 = count;
1156                 if (count1 > (long)runtime->avail)
1157                         count1 = runtime->avail;
1158                 if (kernel) {
1159                         memcpy(runtime->buffer + runtime->appl_ptr, buf, count1);
1160                 } else {
1161                         spin_unlock_irqrestore(&runtime->lock, flags);
1162                         if (copy_from_user(runtime->buffer + runtime->appl_ptr,
1163                                            (char __user *)buf, count1)) {
1164                                 spin_lock_irqsave(&runtime->lock, flags);
1165                                 result = result > 0 ? result : -EFAULT;
1166                                 goto __end;
1167                         }
1168                         spin_lock_irqsave(&runtime->lock, flags);
1169                 }
1170                 runtime->appl_ptr += count1;
1171                 runtime->appl_ptr %= runtime->buffer_size;
1172                 runtime->avail -= count1;
1173                 result += count1;
1174                 buf += count1;
1175                 count -= count1;
1176         }
1177       __end:
1178         count1 = runtime->avail < runtime->buffer_size;
1179         spin_unlock_irqrestore(&runtime->lock, flags);
1180         if (count1)
1181                 snd_rawmidi_output_trigger(substream, 1);
1182         return result;
1183 }
1184
1185 long snd_rawmidi_kernel_write(struct snd_rawmidi_substream *substream,
1186                               const unsigned char *buf, long count)
1187 {
1188         return snd_rawmidi_kernel_write1(substream, buf, count, 1);
1189 }
1190
1191 static ssize_t snd_rawmidi_write(struct file *file, const char __user *buf,
1192                                  size_t count, loff_t *offset)
1193 {
1194         long result, timeout;
1195         int count1;
1196         struct snd_rawmidi_file *rfile;
1197         struct snd_rawmidi_runtime *runtime;
1198         struct snd_rawmidi_substream *substream;
1199
1200         rfile = file->private_data;
1201         substream = rfile->output;
1202         runtime = substream->runtime;
1203         /* we cannot put an atomic message to our buffer */
1204         if (substream->append && count > runtime->buffer_size)
1205                 return -EIO;
1206         result = 0;
1207         while (count > 0) {
1208                 spin_lock_irq(&runtime->lock);
1209                 while (!snd_rawmidi_ready_append(substream, count)) {
1210                         wait_queue_t wait;
1211                         if (file->f_flags & O_NONBLOCK) {
1212                                 spin_unlock_irq(&runtime->lock);
1213                                 return result > 0 ? result : -EAGAIN;
1214                         }
1215                         init_waitqueue_entry(&wait, current);
1216                         add_wait_queue(&runtime->sleep, &wait);
1217                         set_current_state(TASK_INTERRUPTIBLE);
1218                         spin_unlock_irq(&runtime->lock);
1219                         timeout = schedule_timeout(30 * HZ);
1220                         remove_wait_queue(&runtime->sleep, &wait);
1221                         if (signal_pending(current))
1222                                 return result > 0 ? result : -ERESTARTSYS;
1223                         if (!runtime->avail && !timeout)
1224                                 return result > 0 ? result : -EIO;
1225                         spin_lock_irq(&runtime->lock);
1226                 }
1227                 spin_unlock_irq(&runtime->lock);
1228                 count1 = snd_rawmidi_kernel_write1(substream,
1229                                                    (unsigned char __force *)buf,
1230                                                    count, 0);
1231                 if (count1 < 0)
1232                         return result > 0 ? result : count1;
1233                 result += count1;
1234                 buf += count1;
1235                 if ((size_t)count1 < count && (file->f_flags & O_NONBLOCK))
1236                         break;
1237                 count -= count1;
1238         }
1239         if (file->f_flags & O_SYNC) {
1240                 spin_lock_irq(&runtime->lock);
1241                 while (runtime->avail != runtime->buffer_size) {
1242                         wait_queue_t wait;
1243                         unsigned int last_avail = runtime->avail;
1244                         init_waitqueue_entry(&wait, current);
1245                         add_wait_queue(&runtime->sleep, &wait);
1246                         set_current_state(TASK_INTERRUPTIBLE);
1247                         spin_unlock_irq(&runtime->lock);
1248                         timeout = schedule_timeout(30 * HZ);
1249                         remove_wait_queue(&runtime->sleep, &wait);
1250                         if (signal_pending(current))
1251                                 return result > 0 ? result : -ERESTARTSYS;
1252                         if (runtime->avail == last_avail && !timeout)
1253                                 return result > 0 ? result : -EIO;
1254                         spin_lock_irq(&runtime->lock);
1255                 }
1256                 spin_unlock_irq(&runtime->lock);
1257         }
1258         return result;
1259 }
1260
1261 static unsigned int snd_rawmidi_poll(struct file *file, poll_table * wait)
1262 {
1263         struct snd_rawmidi_file *rfile;
1264         struct snd_rawmidi_runtime *runtime;
1265         unsigned int mask;
1266
1267         rfile = file->private_data;
1268         if (rfile->input != NULL) {
1269                 runtime = rfile->input->runtime;
1270                 snd_rawmidi_input_trigger(rfile->input, 1);
1271                 poll_wait(file, &runtime->sleep, wait);
1272         }
1273         if (rfile->output != NULL) {
1274                 runtime = rfile->output->runtime;
1275                 poll_wait(file, &runtime->sleep, wait);
1276         }
1277         mask = 0;
1278         if (rfile->input != NULL) {
1279                 if (snd_rawmidi_ready(rfile->input))
1280                         mask |= POLLIN | POLLRDNORM;
1281         }
1282         if (rfile->output != NULL) {
1283                 if (snd_rawmidi_ready(rfile->output))
1284                         mask |= POLLOUT | POLLWRNORM;
1285         }
1286         return mask;
1287 }
1288
1289 /*
1290  */
1291 #ifdef CONFIG_COMPAT
1292 #include "rawmidi_compat.c"
1293 #else
1294 #define snd_rawmidi_ioctl_compat        NULL
1295 #endif
1296
1297 /*
1298
1299  */
1300
1301 static void snd_rawmidi_proc_info_read(struct snd_info_entry *entry,
1302                                        struct snd_info_buffer *buffer)
1303 {
1304         struct snd_rawmidi *rmidi;
1305         struct snd_rawmidi_substream *substream;
1306         struct snd_rawmidi_runtime *runtime;
1307
1308         rmidi = entry->private_data;
1309         snd_iprintf(buffer, "%s\n\n", rmidi->name);
1310         mutex_lock(&rmidi->open_mutex);
1311         if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_OUTPUT) {
1312                 list_for_each_entry(substream,
1313                                     &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams,
1314                                     list) {
1315                         snd_iprintf(buffer,
1316                                     "Output %d\n"
1317                                     "  Tx bytes     : %lu\n",
1318                                     substream->number,
1319                                     (unsigned long) substream->bytes);
1320                         if (substream->opened) {
1321                                 runtime = substream->runtime;
1322                                 snd_iprintf(buffer,
1323                                     "  Mode         : %s\n"
1324                                     "  Buffer size  : %lu\n"
1325                                     "  Avail        : %lu\n",
1326                                     runtime->oss ? "OSS compatible" : "native",
1327                                     (unsigned long) runtime->buffer_size,
1328                                     (unsigned long) runtime->avail);
1329                         }
1330                 }
1331         }
1332         if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_INPUT) {
1333                 list_for_each_entry(substream,
1334                                     &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams,
1335                                     list) {
1336                         snd_iprintf(buffer,
1337                                     "Input %d\n"
1338                                     "  Rx bytes     : %lu\n",
1339                                     substream->number,
1340                                     (unsigned long) substream->bytes);
1341                         if (substream->opened) {
1342                                 runtime = substream->runtime;
1343                                 snd_iprintf(buffer,
1344                                             "  Buffer size  : %lu\n"
1345                                             "  Avail        : %lu\n"
1346                                             "  Overruns     : %lu\n",
1347                                             (unsigned long) runtime->buffer_size,
1348                                             (unsigned long) runtime->avail,
1349                                             (unsigned long) runtime->xruns);
1350                         }
1351                 }
1352         }
1353         mutex_unlock(&rmidi->open_mutex);
1354 }
1355
1356 /*
1357  *  Register functions
1358  */
1359
1360 static const struct file_operations snd_rawmidi_f_ops =
1361 {
1362         .owner =        THIS_MODULE,
1363         .read =         snd_rawmidi_read,
1364         .write =        snd_rawmidi_write,
1365         .open =         snd_rawmidi_open,
1366         .release =      snd_rawmidi_release,
1367         .poll =         snd_rawmidi_poll,
1368         .unlocked_ioctl =       snd_rawmidi_ioctl,
1369         .compat_ioctl = snd_rawmidi_ioctl_compat,
1370 };
1371
1372 static int snd_rawmidi_alloc_substreams(struct snd_rawmidi *rmidi,
1373                                         struct snd_rawmidi_str *stream,
1374                                         int direction,
1375                                         int count)
1376 {
1377         struct snd_rawmidi_substream *substream;
1378         int idx;
1379
1380         for (idx = 0; idx < count; idx++) {
1381                 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
1382                 if (substream == NULL) {
1383                         snd_printk(KERN_ERR "rawmidi: cannot allocate substream\n");
1384                         return -ENOMEM;
1385                 }
1386                 substream->stream = direction;
1387                 substream->number = idx;
1388                 substream->rmidi = rmidi;
1389                 substream->pstr = stream;
1390                 list_add_tail(&substream->list, &stream->substreams);
1391                 stream->substream_count++;
1392         }
1393         return 0;
1394 }
1395
1396 /**
1397  * snd_rawmidi_new - create a rawmidi instance
1398  * @card: the card instance
1399  * @id: the id string
1400  * @device: the device index
1401  * @output_count: the number of output streams
1402  * @input_count: the number of input streams
1403  * @rrawmidi: the pointer to store the new rawmidi instance
1404  *
1405  * Creates a new rawmidi instance.
1406  * Use snd_rawmidi_set_ops() to set the operators to the new instance.
1407  *
1408  * Returns zero if successful, or a negative error code on failure.
1409  */
1410 int snd_rawmidi_new(struct snd_card *card, char *id, int device,
1411                     int output_count, int input_count,
1412                     struct snd_rawmidi ** rrawmidi)
1413 {
1414         struct snd_rawmidi *rmidi;
1415         int err;
1416         static struct snd_device_ops ops = {
1417                 .dev_free = snd_rawmidi_dev_free,
1418                 .dev_register = snd_rawmidi_dev_register,
1419                 .dev_disconnect = snd_rawmidi_dev_disconnect,
1420         };
1421
1422         snd_assert(rrawmidi != NULL, return -EINVAL);
1423         *rrawmidi = NULL;
1424         snd_assert(card != NULL, return -ENXIO);
1425         rmidi = kzalloc(sizeof(*rmidi), GFP_KERNEL);
1426         if (rmidi == NULL) {
1427                 snd_printk(KERN_ERR "rawmidi: cannot allocate\n");
1428                 return -ENOMEM;
1429         }
1430         rmidi->card = card;
1431         rmidi->device = device;
1432         mutex_init(&rmidi->open_mutex);
1433         init_waitqueue_head(&rmidi->open_wait);
1434         INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams);
1435         INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams);
1436
1437         if (id != NULL)
1438                 strlcpy(rmidi->id, id, sizeof(rmidi->id));
1439         if ((err = snd_rawmidi_alloc_substreams(rmidi,
1440                                                 &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT],
1441                                                 SNDRV_RAWMIDI_STREAM_INPUT,
1442                                                 input_count)) < 0) {
1443                 snd_rawmidi_free(rmidi);
1444                 return err;
1445         }
1446         if ((err = snd_rawmidi_alloc_substreams(rmidi,
1447                                                 &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT],
1448                                                 SNDRV_RAWMIDI_STREAM_OUTPUT,
1449                                                 output_count)) < 0) {
1450                 snd_rawmidi_free(rmidi);
1451                 return err;
1452         }
1453         if ((err = snd_device_new(card, SNDRV_DEV_RAWMIDI, rmidi, &ops)) < 0) {
1454                 snd_rawmidi_free(rmidi);
1455                 return err;
1456         }
1457         *rrawmidi = rmidi;
1458         return 0;
1459 }
1460
1461 static void snd_rawmidi_free_substreams(struct snd_rawmidi_str *stream)
1462 {
1463         struct snd_rawmidi_substream *substream;
1464
1465         while (!list_empty(&stream->substreams)) {
1466                 substream = list_entry(stream->substreams.next, struct snd_rawmidi_substream, list);
1467                 list_del(&substream->list);
1468                 kfree(substream);
1469         }
1470 }
1471
1472 static int snd_rawmidi_free(struct snd_rawmidi *rmidi)
1473 {
1474         snd_assert(rmidi != NULL, return -ENXIO);
1475
1476         snd_info_free_entry(rmidi->proc_entry);
1477         rmidi->proc_entry = NULL;
1478         mutex_lock(&register_mutex);
1479         if (rmidi->ops && rmidi->ops->dev_unregister)
1480                 rmidi->ops->dev_unregister(rmidi);
1481         mutex_unlock(&register_mutex);
1482
1483         snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT]);
1484         snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT]);
1485         if (rmidi->private_free)
1486                 rmidi->private_free(rmidi);
1487         kfree(rmidi);
1488         return 0;
1489 }
1490
1491 static int snd_rawmidi_dev_free(struct snd_device *device)
1492 {
1493         struct snd_rawmidi *rmidi = device->device_data;
1494         return snd_rawmidi_free(rmidi);
1495 }
1496
1497 #if defined(CONFIG_SND_SEQUENCER) || (defined(MODULE) && defined(CONFIG_SND_SEQUENCER_MODULE))
1498 static void snd_rawmidi_dev_seq_free(struct snd_seq_device *device)
1499 {
1500         struct snd_rawmidi *rmidi = device->private_data;
1501         rmidi->seq_dev = NULL;
1502 }
1503 #endif
1504
1505 static int snd_rawmidi_dev_register(struct snd_device *device)
1506 {
1507         int err;
1508         struct snd_info_entry *entry;
1509         char name[16];
1510         struct snd_rawmidi *rmidi = device->device_data;
1511
1512         if (rmidi->device >= SNDRV_RAWMIDI_DEVICES)
1513                 return -ENOMEM;
1514         mutex_lock(&register_mutex);
1515         if (snd_rawmidi_search(rmidi->card, rmidi->device)) {
1516                 mutex_unlock(&register_mutex);
1517                 return -EBUSY;
1518         }
1519         list_add_tail(&rmidi->list, &snd_rawmidi_devices);
1520         sprintf(name, "midiC%iD%i", rmidi->card->number, rmidi->device);
1521         if ((err = snd_register_device(SNDRV_DEVICE_TYPE_RAWMIDI,
1522                                        rmidi->card, rmidi->device,
1523                                        &snd_rawmidi_f_ops, rmidi, name)) < 0) {
1524                 snd_printk(KERN_ERR "unable to register rawmidi device %i:%i\n", rmidi->card->number, rmidi->device);
1525                 list_del(&rmidi->list);
1526                 mutex_unlock(&register_mutex);
1527                 return err;
1528         }
1529         if (rmidi->ops && rmidi->ops->dev_register &&
1530             (err = rmidi->ops->dev_register(rmidi)) < 0) {
1531                 snd_unregister_device(SNDRV_DEVICE_TYPE_RAWMIDI, rmidi->card, rmidi->device);
1532                 list_del(&rmidi->list);
1533                 mutex_unlock(&register_mutex);
1534                 return err;
1535         }
1536 #ifdef CONFIG_SND_OSSEMUL
1537         rmidi->ossreg = 0;
1538         if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1539                 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1540                                             rmidi->card, 0, &snd_rawmidi_f_ops,
1541                                             rmidi, name) < 0) {
1542                         snd_printk(KERN_ERR "unable to register OSS rawmidi device %i:%i\n", rmidi->card->number, 0);
1543                 } else {
1544                         rmidi->ossreg++;
1545 #ifdef SNDRV_OSS_INFO_DEV_MIDI
1546                         snd_oss_info_register(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number, rmidi->name);
1547 #endif
1548                 }
1549         }
1550         if ((int)rmidi->device == amidi_map[rmidi->card->number]) {
1551                 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1552                                             rmidi->card, 1, &snd_rawmidi_f_ops,
1553                                             rmidi, name) < 0) {
1554                         snd_printk(KERN_ERR "unable to register OSS rawmidi device %i:%i\n", rmidi->card->number, 1);
1555                 } else {
1556                         rmidi->ossreg++;
1557                 }
1558         }
1559 #endif /* CONFIG_SND_OSSEMUL */
1560         mutex_unlock(&register_mutex);
1561         sprintf(name, "midi%d", rmidi->device);
1562         entry = snd_info_create_card_entry(rmidi->card, name, rmidi->card->proc_root);
1563         if (entry) {
1564                 entry->private_data = rmidi;
1565                 entry->c.text.read = snd_rawmidi_proc_info_read;
1566                 if (snd_info_register(entry) < 0) {
1567                         snd_info_free_entry(entry);
1568                         entry = NULL;
1569                 }
1570         }
1571         rmidi->proc_entry = entry;
1572 #if defined(CONFIG_SND_SEQUENCER) || (defined(MODULE) && defined(CONFIG_SND_SEQUENCER_MODULE))
1573         if (!rmidi->ops || !rmidi->ops->dev_register) { /* own registration mechanism */
1574                 if (snd_seq_device_new(rmidi->card, rmidi->device, SNDRV_SEQ_DEV_ID_MIDISYNTH, 0, &rmidi->seq_dev) >= 0) {
1575                         rmidi->seq_dev->private_data = rmidi;
1576                         rmidi->seq_dev->private_free = snd_rawmidi_dev_seq_free;
1577                         sprintf(rmidi->seq_dev->name, "MIDI %d-%d", rmidi->card->number, rmidi->device);
1578                         snd_device_register(rmidi->card, rmidi->seq_dev);
1579                 }
1580         }
1581 #endif
1582         return 0;
1583 }
1584
1585 static int snd_rawmidi_dev_disconnect(struct snd_device *device)
1586 {
1587         struct snd_rawmidi *rmidi = device->device_data;
1588
1589         mutex_lock(&register_mutex);
1590         list_del_init(&rmidi->list);
1591 #ifdef CONFIG_SND_OSSEMUL
1592         if (rmidi->ossreg) {
1593                 if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1594                         snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 0);
1595 #ifdef SNDRV_OSS_INFO_DEV_MIDI
1596                         snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number);
1597 #endif
1598                 }
1599                 if ((int)rmidi->device == amidi_map[rmidi->card->number])
1600                         snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 1);
1601                 rmidi->ossreg = 0;
1602         }
1603 #endif /* CONFIG_SND_OSSEMUL */
1604         snd_unregister_device(SNDRV_DEVICE_TYPE_RAWMIDI, rmidi->card, rmidi->device);
1605         mutex_unlock(&register_mutex);
1606         return 0;
1607 }
1608
1609 /**
1610  * snd_rawmidi_set_ops - set the rawmidi operators
1611  * @rmidi: the rawmidi instance
1612  * @stream: the stream direction, SNDRV_RAWMIDI_STREAM_XXX
1613  * @ops: the operator table
1614  *
1615  * Sets the rawmidi operators for the given stream direction.
1616  */
1617 void snd_rawmidi_set_ops(struct snd_rawmidi *rmidi, int stream,
1618                          struct snd_rawmidi_ops *ops)
1619 {
1620         struct snd_rawmidi_substream *substream;
1621
1622         list_for_each_entry(substream, &rmidi->streams[stream].substreams, list)
1623                 substream->ops = ops;
1624 }
1625
1626 /*
1627  *  ENTRY functions
1628  */
1629
1630 static int __init alsa_rawmidi_init(void)
1631 {
1632
1633         snd_ctl_register_ioctl(snd_rawmidi_control_ioctl);
1634         snd_ctl_register_ioctl_compat(snd_rawmidi_control_ioctl);
1635 #ifdef CONFIG_SND_OSSEMUL
1636         { int i;
1637         /* check device map table */
1638         for (i = 0; i < SNDRV_CARDS; i++) {
1639                 if (midi_map[i] < 0 || midi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1640                         snd_printk(KERN_ERR "invalid midi_map[%d] = %d\n", i, midi_map[i]);
1641                         midi_map[i] = 0;
1642                 }
1643                 if (amidi_map[i] < 0 || amidi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1644                         snd_printk(KERN_ERR "invalid amidi_map[%d] = %d\n", i, amidi_map[i]);
1645                         amidi_map[i] = 1;
1646                 }
1647         }
1648         }
1649 #endif /* CONFIG_SND_OSSEMUL */
1650         return 0;
1651 }
1652
1653 static void __exit alsa_rawmidi_exit(void)
1654 {
1655         snd_ctl_unregister_ioctl(snd_rawmidi_control_ioctl);
1656         snd_ctl_unregister_ioctl_compat(snd_rawmidi_control_ioctl);
1657 }
1658
1659 module_init(alsa_rawmidi_init)
1660 module_exit(alsa_rawmidi_exit)
1661
1662 EXPORT_SYMBOL(snd_rawmidi_output_params);
1663 EXPORT_SYMBOL(snd_rawmidi_input_params);
1664 EXPORT_SYMBOL(snd_rawmidi_drop_output);
1665 EXPORT_SYMBOL(snd_rawmidi_drain_output);
1666 EXPORT_SYMBOL(snd_rawmidi_drain_input);
1667 EXPORT_SYMBOL(snd_rawmidi_receive);
1668 EXPORT_SYMBOL(snd_rawmidi_transmit_empty);
1669 EXPORT_SYMBOL(snd_rawmidi_transmit_peek);
1670 EXPORT_SYMBOL(snd_rawmidi_transmit_ack);
1671 EXPORT_SYMBOL(snd_rawmidi_transmit);
1672 EXPORT_SYMBOL(snd_rawmidi_new);
1673 EXPORT_SYMBOL(snd_rawmidi_set_ops);
1674 EXPORT_SYMBOL(snd_rawmidi_info_select);
1675 EXPORT_SYMBOL(snd_rawmidi_kernel_open);
1676 EXPORT_SYMBOL(snd_rawmidi_kernel_release);
1677 EXPORT_SYMBOL(snd_rawmidi_kernel_read);
1678 EXPORT_SYMBOL(snd_rawmidi_kernel_write);