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/smp_lock.h>
  27 #include <linux/sched.h>
  28 #include <linux/slab.h>
  29 #include <linux/time.h>
  30 #include <linux/wait.h>
  31 #include <linux/mutex.h>
  32 #include <linux/moduleparam.h>
  33 #include <linux/delay.h>
  34 #include <linux/wait.h>
  35 #include <sound/rawmidi.h>
  36 #include <sound/info.h>
  37 #include <sound/control.h>
  38 #include <sound/minors.h>
  39 #include <sound/initval.h>
  40
  41 MODULE_AUTHOR("Jaroslav Kysela <perex@suse.cz>");
  42 MODULE_DESCRIPTION("Midlevel RawMidi code for ALSA.");
  43 MODULE_LICENSE("GPL");
  44
  45 #ifdef CONFIG_SND_OSSEMUL
  46 static int midi_map[SNDRV_CARDS];
  47 static int amidi_map[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS-1)] = 1};
  48 module_param_array(midi_map, int, NULL, 0444);
  49 MODULE_PARM_DESC(midi_map, "Raw MIDI device number assigned to 1st OSS device.");
  50 module_param_array(amidi_map, int, NULL, 0444);
  51 MODULE_PARM_DESC(amidi_map, "Raw MIDI device number assigned to 2nd OSS device.");
  52 #endif /* CONFIG_SND_OSSEMUL */
  53
  54 static int snd_rawmidi_free(struct snd_rawmidi *rawmidi);
  55 static int snd_rawmidi_dev_free(struct snd_device *device);
  56 static int snd_rawmidi_dev_register(struct snd_device *device);
  57 static int snd_rawmidi_dev_disconnect(struct snd_device *device);
  58
  59 static LIST_HEAD(snd_rawmidi_devices);
  60 static DEFINE_MUTEX(register_mutex);
  61
  62 static struct snd_rawmidi *snd_rawmidi_search(struct snd_card *card, int device)
  63 {
  64         struct list_head *p;
  65         struct snd_rawmidi *rawmidi;
  66
  67         list_for_each(p, &snd_rawmidi_devices) {
  68                 rawmidi = list_entry(p, struct snd_rawmidi, list);
  69                 if (rawmidi->card == card && rawmidi->device == device)
  70                         return rawmidi;
  71         }
  72         return NULL;
  73 }
  74
  75 static inline unsigned short snd_rawmidi_file_flags(struct file *file)
  76 {
  77         switch (file->f_mode & (FMODE_READ | FMODE_WRITE)) {
  78         case FMODE_WRITE:
  79                 return SNDRV_RAWMIDI_LFLG_OUTPUT;
  80         case FMODE_READ:
  81                 return SNDRV_RAWMIDI_LFLG_INPUT;
  82         default:
  83                 return SNDRV_RAWMIDI_LFLG_OPEN;
  84         }
  85 }
  86
  87 static inline int snd_rawmidi_ready(struct snd_rawmidi_substream *substream)
  88 {
  89         struct snd_rawmidi_runtime *runtime = substream->runtime;
  90         return runtime->avail >= runtime->avail_min;
  91 }
  92
  93 static inline int snd_rawmidi_ready_append(struct snd_rawmidi_substream *substream,
  94                                            size_t count)
  95 {
  96         struct snd_rawmidi_runtime *runtime = substream->runtime;
  97         return runtime->avail >= runtime->avail_min &&
  98                (!substream->append || runtime->avail >= count);
  99 }
 100
 101 static void snd_rawmidi_input_event_tasklet(unsigned long data)
 102 {
 103         struct snd_rawmidi_substream *substream = (struct snd_rawmidi_substream *)data;
 104         substream->runtime->event(substream);
 105 }
 106
 107 static void snd_rawmidi_output_trigger_tasklet(unsigned long data)
 108 {
 109         struct snd_rawmidi_substream *substream = (struct snd_rawmidi_substream *)data;
 110         substream->ops->trigger(substream, 1);
 111 }
 112
 113 static int snd_rawmidi_runtime_create(struct snd_rawmidi_substream *substream)
 114 {
 115         struct snd_rawmidi_runtime *runtime;
 116
 117         if ((runtime = kzalloc(sizeof(*runtime), GFP_KERNEL)) == NULL)
 118                 return -ENOMEM;
 119         spin_lock_init(&runtime->lock);
 120         init_waitqueue_head(&runtime->sleep);
 121         if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
 122                 tasklet_init(&runtime->tasklet,
 123                              snd_rawmidi_input_event_tasklet,
 124                              (unsigned long)substream);
 125         else
 126                 tasklet_init(&runtime->tasklet,
 127                              snd_rawmidi_output_trigger_tasklet,
 128                              (unsigned long)substream);
 129         runtime->event = NULL;
 130         runtime->buffer_size = PAGE_SIZE;
 131         runtime->avail_min = 1;
 132         if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
 133                 runtime->avail = 0;
 134         else
 135                 runtime->avail = runtime->buffer_size;
 136         if ((runtime->buffer = kmalloc(runtime->buffer_size, GFP_KERNEL)) == NULL) {
 137                 kfree(runtime);
 138                 return -ENOMEM;
 139         }
 140         runtime->appl_ptr = runtime->hw_ptr = 0;
 141         substream->runtime = runtime;
 142         return 0;
 143 }
 144
 145 static int snd_rawmidi_runtime_free(struct snd_rawmidi_substream *substream)
 146 {
 147         struct snd_rawmidi_runtime *runtime = substream->runtime;
 148
 149         kfree(runtime->buffer);
 150         kfree(runtime);
 151         substream->runtime = NULL;
 152         return 0;
 153 }
 154
 155 static inline void snd_rawmidi_output_trigger(struct snd_rawmidi_substream *substream,int up)
 156 {
 157         if (up) {
 158                 tasklet_hi_schedule(&substream->runtime->tasklet);
 159         } else {
 160                 tasklet_kill(&substream->runtime->tasklet);
 161                 substream->ops->trigger(substream, 0);
 162         }
 163 }
 164
 165 static void snd_rawmidi_input_trigger(struct snd_rawmidi_substream *substream, int up)
 166 {
 167         substream->ops->trigger(substream, up);
 168         if (!up && substream->runtime->event)
 169                 tasklet_kill(&substream->runtime->tasklet);
 170 }
 171
 172 int snd_rawmidi_drop_output(struct snd_rawmidi_substream *substream)
 173 {
 174         unsigned long flags;
 175         struct snd_rawmidi_runtime *runtime = substream->runtime;
 176
 177         snd_rawmidi_output_trigger(substream, 0);
 178         runtime->drain = 0;
 179         spin_lock_irqsave(&runtime->lock, flags);
 180         runtime->appl_ptr = runtime->hw_ptr = 0;
 181         runtime->avail = runtime->buffer_size;
 182         spin_unlock_irqrestore(&runtime->lock, flags);
 183         return 0;
 184 }
 185
 186 int snd_rawmidi_drain_output(struct snd_rawmidi_substream *substream)
 187 {
 188         int err;
 189         long timeout;
 190         struct snd_rawmidi_runtime *runtime = substream->runtime;
 191
 192         err = 0;
 193         runtime->drain = 1;
 194         timeout = wait_event_interruptible_timeout(runtime->sleep,
 195                                 (runtime->avail >= runtime->buffer_size),
 196                                 10*HZ);
 197         if (signal_pending(current))
 198                 err = -ERESTARTSYS;
 199         if (runtime->avail < runtime->buffer_size && !timeout) {
 200                 snd_printk(KERN_WARNING "rawmidi drain error (avail = %li, buffer_size = %li)\n", (long)runtime->avail, (long)runtime->buffer_size);
 201                 err = -EIO;
 202         }
 203         runtime->drain = 0;
 204         if (err != -ERESTARTSYS) {
 205                 /* we need wait a while to make sure that Tx FIFOs are empty */
 206                 if (substream->ops->drain)
 207                         substream->ops->drain(substream);
 208                 else
 209                         msleep(50);
 210                 snd_rawmidi_drop_output(substream);
 211         }
 212         return err;
 213 }
 214
 215 int snd_rawmidi_drain_input(struct snd_rawmidi_substream *substream)
 216 {
 217         unsigned long flags;
 218         struct snd_rawmidi_runtime *runtime = substream->runtime;
 219
 220         snd_rawmidi_input_trigger(substream, 0);
 221         runtime->drain = 0;
 222         spin_lock_irqsave(&runtime->lock, flags);
 223         runtime->appl_ptr = runtime->hw_ptr = 0;
 224         runtime->avail = 0;
 225         spin_unlock_irqrestore(&runtime->lock, flags);
 226         return 0;
 227 }
 228
 229 int snd_rawmidi_kernel_open(struct snd_card *card, int device, int subdevice,
 230                             int mode, struct snd_rawmidi_file * rfile)
 231 {
 232         struct snd_rawmidi *rmidi;
 233         struct list_head *list1, *list2;
 234         struct snd_rawmidi_substream *sinput = NULL, *soutput = NULL;
 235         struct snd_rawmidi_runtime *input = NULL, *output = NULL;
 236         int err;
 237
 238         if (rfile)
 239                 rfile->input = rfile->output = NULL;
 240         mutex_lock(&register_mutex);
 241         rmidi = snd_rawmidi_search(card, device);
 242         mutex_unlock(&register_mutex);
 243         if (rmidi == NULL) {
 244                 err = -ENODEV;
 245                 goto __error1;
 246         }
 247         if (!try_module_get(rmidi->card->module)) {
 248                 err = -EFAULT;
 249                 goto __error1;
 250         }
 251         if (!(mode & SNDRV_RAWMIDI_LFLG_NOOPENLOCK))
 252                 mutex_lock(&rmidi->open_mutex);
 253         if (mode & SNDRV_RAWMIDI_LFLG_INPUT) {
 254                 if (!(rmidi->info_flags & SNDRV_RAWMIDI_INFO_INPUT)) {
 255                         err = -ENXIO;
 256                         goto __error;
 257                 }
 258                 if (subdevice >= 0 && (unsigned int)subdevice >= rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substream_count) {
 259                         err = -ENODEV;
 260                         goto __error;
 261                 }
 262                 if (rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substream_opened >=
 263                     rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substream_count) {
 264                         err = -EAGAIN;
 265                         goto __error;
 266                 }
 267         }
 268         if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) {
 269                 if (!(rmidi->info_flags & SNDRV_RAWMIDI_INFO_OUTPUT)) {
 270                         err = -ENXIO;
 271                         goto __error;
 272                 }
 273                 if (subdevice >= 0 && (unsigned int)subdevice >= rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substream_count) {
 274                         err = -ENODEV;
 275                         goto __error;
 276                 }
 277                 if (rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substream_opened >=
 278                     rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substream_count) {
 279                         err = -EAGAIN;
 280                         goto __error;
 281                 }
 282         }
 283         list1 = rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams.next;
 284         while (1) {
 285                 if (list1 == &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams) {
 286                         sinput = NULL;
 287                         if (mode & SNDRV_RAWMIDI_LFLG_INPUT) {
 288                                 err = -EAGAIN;
 289                                 goto __error;
 290                         }
 291                         break;
 292                 }
 293                 sinput = list_entry(list1, struct snd_rawmidi_substream, list);
 294                 if ((mode & SNDRV_RAWMIDI_LFLG_INPUT) && sinput->opened)
 295                         goto __nexti;
 296                 if (subdevice < 0 || (subdevice >= 0 && subdevice == sinput->number))
 297                         break;
 298               __nexti:
 299                 list1 = list1->next;
 300         }
 301         list2 = rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams.next;
 302         while (1) {
 303                 if (list2 == &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams) {
 304                         soutput = NULL;
 305                         if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) {
 306                                 err = -EAGAIN;
 307                                 goto __error;
 308                         }
 309                         break;
 310                 }
 311                 soutput = list_entry(list2, struct snd_rawmidi_substream, list);
 312                 if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) {
 313                         if (mode & SNDRV_RAWMIDI_LFLG_APPEND) {
 314                                 if (soutput->opened && !soutput->append)
 315                                         goto __nexto;
 316                         } else {
 317                                 if (soutput->opened)
 318                                         goto __nexto;
 319                         }
 320                 }
 321                 if (subdevice < 0 || (subdevice >= 0 && subdevice == soutput->number))
 322                         break;
 323               __nexto:
 324                 list2 = list2->next;
 325         }
 326         if (mode & SNDRV_RAWMIDI_LFLG_INPUT) {
 327                 if ((err = snd_rawmidi_runtime_create(sinput)) < 0)
 328                         goto __error;
 329                 input = sinput->runtime;
 330                 if ((err = sinput->ops->open(sinput)) < 0)
 331                         goto __error;
 332                 sinput->opened = 1;
 333                 rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substream_opened++;
 334         } else {
 335                 sinput = NULL;
 336         }
 337         if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) {
 338                 if (soutput->opened)
 339                         goto __skip_output;
 340                 if ((err = snd_rawmidi_runtime_create(soutput)) < 0) {
 341                         if (mode & SNDRV_RAWMIDI_LFLG_INPUT)
 342                                 sinput->ops->close(sinput);
 343                         goto __error;
 344                 }
 345                 output = soutput->runtime;
 346                 if ((err = soutput->ops->open(soutput)) < 0) {
 347                         if (mode & SNDRV_RAWMIDI_LFLG_INPUT)
 348                                 sinput->ops->close(sinput);
 349                         goto __error;
 350                 }
 351               __skip_output:
 352                 soutput->opened = 1;
 353                 if (mode & SNDRV_RAWMIDI_LFLG_APPEND)
 354                         soutput->append = 1;
 355                 if (soutput->use_count++ == 0)
 356                         soutput->active_sensing = 1;
 357                 rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substream_opened++;
 358         } else {
 359                 soutput = NULL;
 360         }
 361         if (!(mode & SNDRV_RAWMIDI_LFLG_NOOPENLOCK))
 362                 mutex_unlock(&rmidi->open_mutex);
 363         if (rfile) {
 364                 rfile->rmidi = rmidi;
 365                 rfile->input = sinput;
 366                 rfile->output = soutput;
 367         }
 368         return 0;
 369
 370       __error:
 371         if (input != NULL)
 372                 snd_rawmidi_runtime_free(sinput);
 373         if (output != NULL)
 374                 snd_rawmidi_runtime_free(soutput);
 375         module_put(rmidi->card->module);
 376         if (!(mode & SNDRV_RAWMIDI_LFLG_NOOPENLOCK))
 377                 mutex_unlock(&rmidi->open_mutex);
 378       __error1:
 379         return err;
 380 }
 381
 382 static int snd_rawmidi_open(struct inode *inode, struct file *file)
 383 {
 384         int maj = imajor(inode);
 385         struct snd_card *card;
 386         int subdevice;
 387         unsigned short fflags;
 388         int err;
 389         struct snd_rawmidi *rmidi;
 390         struct snd_rawmidi_file *rawmidi_file;
 391         wait_queue_t wait;
 392         struct list_head *list;
 393         struct snd_ctl_file *kctl;
 394
 395         if (maj == snd_major) {
 396                 rmidi = snd_lookup_minor_data(iminor(inode),
 397                                               SNDRV_DEVICE_TYPE_RAWMIDI);
 398 #ifdef CONFIG_SND_OSSEMUL
 399         } else if (maj == SOUND_MAJOR) {
 400                 rmidi = snd_lookup_oss_minor_data(iminor(inode),
 401                                                   SNDRV_OSS_DEVICE_TYPE_MIDI);
 402 #endif
 403         } else
 404                 return -ENXIO;
 405
 406         if (rmidi == NULL)
 407                 return -ENODEV;
 408         if ((file->f_flags & O_APPEND) && !(file->f_flags & O_NONBLOCK))
 409                 return -EINVAL;         /* invalid combination */
 410         card = rmidi->card;
 411         err = snd_card_file_add(card, file);
 412         if (err < 0)
 413                 return -ENODEV;
 414         fflags = snd_rawmidi_file_flags(file);
 415         if ((file->f_flags & O_APPEND) || maj == SOUND_MAJOR) /* OSS emul? */
 416                 fflags |= SNDRV_RAWMIDI_LFLG_APPEND;
 417         fflags |= SNDRV_RAWMIDI_LFLG_NOOPENLOCK;
 418         rawmidi_file = kmalloc(sizeof(*rawmidi_file), GFP_KERNEL);
 419         if (rawmidi_file == NULL) {
 420                 snd_card_file_remove(card, file);
 421                 return -ENOMEM;
 422         }
 423         init_waitqueue_entry(&wait, current);
 424         add_wait_queue(&rmidi->open_wait, &wait);
 425         mutex_lock(&rmidi->open_mutex);
 426         while (1) {
 427                 subdevice = -1;
 428                 down_read(&card->controls_rwsem);
 429                 list_for_each(list, &card->ctl_files) {
 430                         kctl = snd_ctl_file(list);
 431                         if (kctl->pid == current->pid) {
 432                                 subdevice = kctl->prefer_rawmidi_subdevice;
 433                                 break;
 434                         }
 435                 }
 436                 up_read(&card->controls_rwsem);
 437                 err = snd_rawmidi_kernel_open(rmidi->card, rmidi->device,
 438                                               subdevice, fflags, rawmidi_file);
 439                 if (err >= 0)
 440                         break;
 441                 if (err == -EAGAIN) {
 442                         if (file->f_flags & O_NONBLOCK) {
 443                                 err = -EBUSY;
 444                                 break;
 445                         }
 446                 } else
 447                         break;
 448                 set_current_state(TASK_INTERRUPTIBLE);
 449                 mutex_unlock(&rmidi->open_mutex);
 450                 schedule();
 451                 mutex_lock(&rmidi->open_mutex);
 452                 if (signal_pending(current)) {
 453                         err = -ERESTARTSYS;
 454                         break;
 455                 }
 456         }
 457 #ifdef CONFIG_SND_OSSEMUL
 458         if (rawmidi_file->input && rawmidi_file->input->runtime)
 459                 rawmidi_file->input->runtime->oss = (maj == SOUND_MAJOR);
 460         if (rawmidi_file->output && rawmidi_file->output->runtime)
 461                 rawmidi_file->output->runtime->oss = (maj == SOUND_MAJOR);
 462 #endif
 463         remove_wait_queue(&rmidi->open_wait, &wait);
 464         if (err >= 0) {
 465                 file->private_data = rawmidi_file;
 466         } else {
 467                 snd_card_file_remove(card, file);
 468                 kfree(rawmidi_file);
 469         }
 470         mutex_unlock(&rmidi->open_mutex);
 471         return err;
 472 }
 473
 474 int snd_rawmidi_kernel_release(struct snd_rawmidi_file * rfile)
 475 {
 476         struct snd_rawmidi *rmidi;
 477         struct snd_rawmidi_substream *substream;
 478         struct snd_rawmidi_runtime *runtime;
 479
 480         snd_assert(rfile != NULL, return -ENXIO);
 481         snd_assert(rfile->input != NULL || rfile->output != NULL, return -ENXIO);
 482         rmidi = rfile->rmidi;
 483         mutex_lock(&rmidi->open_mutex);
 484         if (rfile->input != NULL) {
 485                 substream = rfile->input;
 486                 rfile->input = NULL;
 487                 runtime = substream->runtime;
 488                 snd_rawmidi_input_trigger(substream, 0);
 489                 substream->ops->close(substream);
 490                 if (runtime->private_free != NULL)
 491                         runtime->private_free(substream);
 492                 snd_rawmidi_runtime_free(substream);
 493                 substream->opened = 0;
 494                 rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substream_opened--;
 495         }
 496         if (rfile->output != NULL) {
 497                 substream = rfile->output;
 498                 rfile->output = NULL;
 499                 if (--substream->use_count == 0) {
 500                         runtime = substream->runtime;
 501                         if (substream->active_sensing) {
 502                                 unsigned char buf = 0xfe;
 503                                 /* sending single active sensing message to shut the device up */
 504                                 snd_rawmidi_kernel_write(substream, &buf, 1);
 505                         }
 506                         if (snd_rawmidi_drain_output(substream) == -ERESTARTSYS)
 507                                 snd_rawmidi_output_trigger(substream, 0);
 508                         substream->ops->close(substream);
 509                         if (runtime->private_free != NULL)
 510                                 runtime->private_free(substream);
 511                         snd_rawmidi_runtime_free(substream);
 512                         substream->opened = 0;
 513                         substream->append = 0;
 514                 }
 515                 rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substream_opened--;
 516         }
 517         mutex_unlock(&rmidi->open_mutex);
 518         module_put(rmidi->card->module);
 519         return 0;
 520 }
 521
 522 static int snd_rawmidi_release(struct inode *inode, struct file *file)
 523 {
 524         struct snd_rawmidi_file *rfile;
 525         struct snd_rawmidi *rmidi;
 526         int err;
 527
 528         rfile = file->private_data;
 529         err = snd_rawmidi_kernel_release(rfile);
 530         rmidi = rfile->rmidi;
 531         wake_up(&rmidi->open_wait);
 532         kfree(rfile);
 533         snd_card_file_remove(rmidi->card, file);
 534         return err;
 535 }
 536
 537 static int snd_rawmidi_info(struct snd_rawmidi_substream *substream,
 538                             struct snd_rawmidi_info *info)
 539 {
 540         struct snd_rawmidi *rmidi;
 541
 542         if (substream == NULL)
 543                 return -ENODEV;
 544         rmidi = substream->rmidi;
 545         memset(info, 0, sizeof(*info));
 546         info->card = rmidi->card->number;
 547         info->device = rmidi->device;
 548         info->subdevice = substream->number;
 549         info->stream = substream->stream;
 550         info->flags = rmidi->info_flags;
 551         strcpy(info->id, rmidi->id);
 552         strcpy(info->name, rmidi->name);
 553         strcpy(info->subname, substream->name);
 554         info->subdevices_count = substream->pstr->substream_count;
 555         info->subdevices_avail = (substream->pstr->substream_count -
 556                                   substream->pstr->substream_opened);
 557         return 0;
 558 }
 559
 560 static int snd_rawmidi_info_user(struct snd_rawmidi_substream *substream,
 561                                  struct snd_rawmidi_info __user * _info)
 562 {
 563         struct snd_rawmidi_info info;
 564         int err;
 565         if ((err = snd_rawmidi_info(substream, &info)) < 0)
 566                 return err;
 567         if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
 568                 return -EFAULT;
 569         return 0;
 570 }
 571
 572 int snd_rawmidi_info_select(struct snd_card *card, struct snd_rawmidi_info *info)
 573 {
 574         struct snd_rawmidi *rmidi;
 575         struct snd_rawmidi_str *pstr;
 576         struct snd_rawmidi_substream *substream;
 577         struct list_head *list;
 578
 579         mutex_lock(&register_mutex);
 580         rmidi = snd_rawmidi_search(card, info->device);
 581         mutex_unlock(&register_mutex);
 582         if (!rmidi)
 583                 return -ENXIO;
 584         if (info->stream < 0 || info->stream > 1)
 585                 return -EINVAL;
 586         pstr = &rmidi->streams[info->stream];
 587         if (pstr->substream_count == 0)
 588                 return -ENOENT;
 589         if (info->subdevice >= pstr->substream_count)
 590                 return -ENXIO;
 591         list_for_each(list, &pstr->substreams) {
 592                 substream = list_entry(list, struct snd_rawmidi_substream, list);
 593                 if ((unsigned int)substream->number == info->subdevice)
 594                         return snd_rawmidi_info(substream, info);
 595         }
 596         return -ENXIO;
 597 }
 598
 599 static int snd_rawmidi_info_select_user(struct snd_card *card,
 600                                         struct snd_rawmidi_info __user *_info)
 601 {
 602         int err;
 603         struct snd_rawmidi_info info;
 604         if (get_user(info.device, &_info->device))
 605                 return -EFAULT;
 606         if (get_user(info.stream, &_info->stream))
 607                 return -EFAULT;
 608         if (get_user(info.subdevice, &_info->subdevice))
 609                 return -EFAULT;
 610         if ((err = snd_rawmidi_info_select(card, &info)) < 0)
 611                 return err;
 612         if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
 613                 return -EFAULT;
 614         return 0;
 615 }
 616
 617 int snd_rawmidi_output_params(struct snd_rawmidi_substream *substream,
 618                               struct snd_rawmidi_params * params)
 619 {
 620         char *newbuf;
 621         struct snd_rawmidi_runtime *runtime = substream->runtime;
 622
 623         if (substream->append && substream->use_count > 1)
 624                 return -EBUSY;
 625         snd_rawmidi_drain_output(substream);
 626         if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L) {
 627                 return -EINVAL;
 628         }
 629         if (params->avail_min < 1 || params->avail_min > params->buffer_size) {
 630                 return -EINVAL;
 631         }
 632         if (params->buffer_size != runtime->buffer_size) {
 633                 newbuf = kmalloc(params->buffer_size, GFP_KERNEL);
 634                 if (!newbuf)
 635                         return -ENOMEM;
 636                 kfree(runtime->buffer);
 637                 runtime->buffer = newbuf;
 638                 runtime->buffer_size = params->buffer_size;
 639                 runtime->avail = runtime->buffer_size;
 640         }
 641         runtime->avail_min = params->avail_min;
 642         substream->active_sensing = !params->no_active_sensing;
 643         return 0;
 644 }
 645
 646 int snd_rawmidi_input_params(struct snd_rawmidi_substream *substream,
 647                              struct snd_rawmidi_params * params)
 648 {
 649         char *newbuf;
 650         struct snd_rawmidi_runtime *runtime = substream->runtime;
 651
 652         snd_rawmidi_drain_input(substream);
 653         if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L) {
 654                 return -EINVAL;
 655         }
 656         if (params->avail_min < 1 || params->avail_min > params->buffer_size) {
 657                 return -EINVAL;
 658         }
 659         if (params->buffer_size != runtime->buffer_size) {
 660                 newbuf = kmalloc(params->buffer_size, GFP_KERNEL);
 661                 if (!newbuf)
 662                         return -ENOMEM;
 663                 kfree(runtime->buffer);
 664                 runtime->buffer = newbuf;
 665                 runtime->buffer_size = params->buffer_size;
 666         }
 667         runtime->avail_min = params->avail_min;
 668         return 0;
 669 }
 670
 671 static int snd_rawmidi_output_status(struct snd_rawmidi_substream *substream,
 672                                      struct snd_rawmidi_status * status)
 673 {
 674         struct snd_rawmidi_runtime *runtime = substream->runtime;
 675
 676         memset(status, 0, sizeof(*status));
 677         status->stream = SNDRV_RAWMIDI_STREAM_OUTPUT;
 678         spin_lock_irq(&runtime->lock);
 679         status->avail = runtime->avail;
 680         spin_unlock_irq(&runtime->lock);
 681         return 0;
 682 }
 683
 684 static int snd_rawmidi_input_status(struct snd_rawmidi_substream *substream,
 685                                     struct snd_rawmidi_status * status)
 686 {
 687         struct snd_rawmidi_runtime *runtime = substream->runtime;
 688
 689         memset(status, 0, sizeof(*status));
 690         status->stream = SNDRV_RAWMIDI_STREAM_INPUT;
 691         spin_lock_irq(&runtime->lock);
 692         status->avail = runtime->avail;
 693         status->xruns = runtime->xruns;
 694         runtime->xruns = 0;
 695         spin_unlock_irq(&runtime->lock);
 696         return 0;
 697 }
 698
 699 static long snd_rawmidi_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 700 {
 701         struct snd_rawmidi_file *rfile;
 702         void __user *argp = (void __user *)arg;
 703
 704         rfile = file->private_data;
 705         if (((cmd >> 8) & 0xff) != 'W')
 706                 return -ENOTTY;
 707         switch (cmd) {
 708         case SNDRV_RAWMIDI_IOCTL_PVERSION:
 709                 return put_user(SNDRV_RAWMIDI_VERSION, (int __user *)argp) ? -EFAULT : 0;
 710         case SNDRV_RAWMIDI_IOCTL_INFO:
 711         {
 712                 int stream;
 713                 struct snd_rawmidi_info __user *info = argp;
 714                 if (get_user(stream, &info->stream))
 715                         return -EFAULT;
 716                 switch (stream) {
 717                 case SNDRV_RAWMIDI_STREAM_INPUT:
 718                         return snd_rawmidi_info_user(rfile->input, info);
 719                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
 720                         return snd_rawmidi_info_user(rfile->output, info);
 721                 default:
 722                         return -EINVAL;
 723                 }
 724         }
 725         case SNDRV_RAWMIDI_IOCTL_PARAMS:
 726         {
 727                 struct snd_rawmidi_params params;
 728                 if (copy_from_user(&params, argp, sizeof(struct snd_rawmidi_params)))
 729                         return -EFAULT;
 730                 switch (params.stream) {
 731                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
 732                         if (rfile->output == NULL)
 733                                 return -EINVAL;
 734                         return snd_rawmidi_output_params(rfile->output, &params);
 735                 case SNDRV_RAWMIDI_STREAM_INPUT:
 736                         if (rfile->input == NULL)
 737                                 return -EINVAL;
 738                         return snd_rawmidi_input_params(rfile->input, &params);
 739                 default:
 740                         return -EINVAL;
 741                 }
 742         }
 743         case SNDRV_RAWMIDI_IOCTL_STATUS:
 744         {
 745                 int err = 0;
 746                 struct snd_rawmidi_status status;
 747                 if (copy_from_user(&status, argp, sizeof(struct snd_rawmidi_status)))
 748                         return -EFAULT;
 749                 switch (status.stream) {
 750                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
 751                         if (rfile->output == NULL)
 752                                 return -EINVAL;
 753                         err = snd_rawmidi_output_status(rfile->output, &status);
 754                         break;
 755                 case SNDRV_RAWMIDI_STREAM_INPUT:
 756                         if (rfile->input == NULL)
 757                                 return -EINVAL;
 758                         err = snd_rawmidi_input_status(rfile->input, &status);
 759                         break;
 760                 default:
 761                         return -EINVAL;
 762                 }
 763                 if (err < 0)
 764                         return err;
 765                 if (copy_to_user(argp, &status, sizeof(struct snd_rawmidi_status)))
 766                         return -EFAULT;
 767                 return 0;
 768         }
 769         case SNDRV_RAWMIDI_IOCTL_DROP:
 770         {
 771                 int val;
 772                 if (get_user(val, (int __user *) argp))
 773                         return -EFAULT;
 774                 switch (val) {
 775                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
 776                         if (rfile->output == NULL)
 777                                 return -EINVAL;
 778                         return snd_rawmidi_drop_output(rfile->output);
 779                 default:
 780                         return -EINVAL;
 781                 }
 782         }
 783         case SNDRV_RAWMIDI_IOCTL_DRAIN:
 784         {
 785                 int val;
 786                 if (get_user(val, (int __user *) argp))
 787                         return -EFAULT;
 788                 switch (val) {
 789                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
 790                         if (rfile->output == NULL)
 791                                 return -EINVAL;
 792                         return snd_rawmidi_drain_output(rfile->output);
 793                 case SNDRV_RAWMIDI_STREAM_INPUT:
 794                         if (rfile->input == NULL)
 795                                 return -EINVAL;
 796                         return snd_rawmidi_drain_input(rfile->input);
 797                 default:
 798                         return -EINVAL;
 799                 }
 800         }
 801 #ifdef CONFIG_SND_DEBUG
 802         default:
 803                 snd_printk(KERN_WARNING "rawmidi: unknown command = 0x%x\n", cmd);
 804 #endif
 805         }
 806         return -ENOTTY;
 807 }
 808
 809 static int snd_rawmidi_control_ioctl(struct snd_card *card,
 810                                      struct snd_ctl_file *control,
 811                                      unsigned int cmd,
 812                                      unsigned long arg)
 813 {
 814         void __user *argp = (void __user *)arg;
 815
 816         switch (cmd) {
 817         case SNDRV_CTL_IOCTL_RAWMIDI_NEXT_DEVICE:
 818         {
 819                 int device;
 820
 821                 if (get_user(device, (int __user *)argp))
 822                         return -EFAULT;
 823                 mutex_lock(&register_mutex);
 824                 device = device < 0 ? 0 : device + 1;
 825                 while (device < SNDRV_RAWMIDI_DEVICES) {
 826                         if (snd_rawmidi_search(card, device))
 827                                 break;
 828                         device++;
 829                 }
 830                 if (device == SNDRV_RAWMIDI_DEVICES)
 831                         device = -1;
 832                 mutex_unlock(&register_mutex);
 833                 if (put_user(device, (int __user *)argp))
 834                         return -EFAULT;
 835                 return 0;
 836         }
 837         case SNDRV_CTL_IOCTL_RAWMIDI_PREFER_SUBDEVICE:
 838         {
 839                 int val;
 840
 841                 if (get_user(val, (int __user *)argp))
 842                         return -EFAULT;
 843                 control->prefer_rawmidi_subdevice = val;
 844                 return 0;
 845         }
 846         case SNDRV_CTL_IOCTL_RAWMIDI_INFO:
 847                 return snd_rawmidi_info_select_user(card, argp);
 848         }
 849         return -ENOIOCTLCMD;
 850 }
 851
 852 /**
 853  * snd_rawmidi_receive - receive the input data from the device
 854  * @substream: the rawmidi substream
 855  * @buffer: the buffer pointer
 856  * @count: the data size to read
 857  *
 858  * Reads the data from the internal buffer.
 859  *
 860  * Returns the size of read data, or a negative error code on failure.
 861  */
 862 int snd_rawmidi_receive(struct snd_rawmidi_substream *substream,
 863                         const unsigned char *buffer, int count)
 864 {
 865         unsigned long flags;
 866         int result = 0, count1;
 867         struct snd_rawmidi_runtime *runtime = substream->runtime;
 868
 869         if (runtime->buffer == NULL) {
 870                 snd_printd("snd_rawmidi_receive: input is not active!!!\n");
 871                 return -EINVAL;
 872         }
 873         spin_lock_irqsave(&runtime->lock, flags);
 874         if (count == 1) {       /* special case, faster code */
 875                 substream->bytes++;
 876                 if (runtime->avail < runtime->buffer_size) {
 877                         runtime->buffer[runtime->hw_ptr++] = buffer[0];
 878                         runtime->hw_ptr %= runtime->buffer_size;
 879                         runtime->avail++;
 880                         result++;
 881                 } else {
 882                         runtime->xruns++;
 883                 }
 884         } else {
 885                 substream->bytes += count;
 886                 count1 = runtime->buffer_size - runtime->hw_ptr;
 887                 if (count1 > count)
 888                         count1 = count;
 889                 if (count1 > (int)(runtime->buffer_size - runtime->avail))
 890                         count1 = runtime->buffer_size - runtime->avail;
 891                 memcpy(runtime->buffer + runtime->hw_ptr, buffer, count1);
 892                 runtime->hw_ptr += count1;
 893                 runtime->hw_ptr %= runtime->buffer_size;
 894                 runtime->avail += count1;
 895                 count -= count1;
 896                 result += count1;
 897                 if (count > 0) {
 898                         buffer += count1;
 899                         count1 = count;
 900                         if (count1 > (int)(runtime->buffer_size - runtime->avail)) {
 901                                 count1 = runtime->buffer_size - runtime->avail;
 902                                 runtime->xruns += count - count1;
 903                         }
 904                         if (count1 > 0) {
 905                                 memcpy(runtime->buffer, buffer, count1);
 906                                 runtime->hw_ptr = count1;
 907                                 runtime->avail += count1;
 908                                 result += count1;
 909                         }
 910                 }
 911         }
 912         if (result > 0) {
 913                 if (runtime->event)
 914                         tasklet_hi_schedule(&runtime->tasklet);
 915                 else if (snd_rawmidi_ready(substream))
 916                         wake_up(&runtime->sleep);
 917         }
 918         spin_unlock_irqrestore(&runtime->lock, flags);
 919         return result;
 920 }
 921
 922 static long snd_rawmidi_kernel_read1(struct snd_rawmidi_substream *substream,
 923                                      unsigned char *buf, long count, int kernel)
 924 {
 925         unsigned long flags;
 926         long result = 0, count1;
 927         struct snd_rawmidi_runtime *runtime = substream->runtime;
 928
 929         while (count > 0 && runtime->avail) {
 930                 count1 = runtime->buffer_size - runtime->appl_ptr;
 931                 if (count1 > count)
 932                         count1 = count;
 933                 spin_lock_irqsave(&runtime->lock, flags);
 934                 if (count1 > (int)runtime->avail)
 935                         count1 = runtime->avail;
 936                 if (kernel) {
 937                         memcpy(buf + result, runtime->buffer + runtime->appl_ptr, count1);
 938                 } else {
 939                         spin_unlock_irqrestore(&runtime->lock, flags);
 940                         if (copy_to_user((char __user *)buf + result,
 941                                          runtime->buffer + runtime->appl_ptr, count1)) {
 942                                 return result > 0 ? result : -EFAULT;
 943                         }
 944                         spin_lock_irqsave(&runtime->lock, flags);
 945                 }
 946                 runtime->appl_ptr += count1;
 947                 runtime->appl_ptr %= runtime->buffer_size;
 948                 runtime->avail -= count1;
 949                 spin_unlock_irqrestore(&runtime->lock, flags);
 950                 result += count1;
 951                 count -= count1;
 952         }
 953         return result;
 954 }
 955
 956 long snd_rawmidi_kernel_read(struct snd_rawmidi_substream *substream,
 957                              unsigned char *buf, long count)
 958 {
 959         snd_rawmidi_input_trigger(substream, 1);
 960         return snd_rawmidi_kernel_read1(substream, buf, count, 1);
 961 }
 962
 963 static ssize_t snd_rawmidi_read(struct file *file, char __user *buf, size_t count,
 964                                 loff_t *offset)
 965 {
 966         long result;
 967         int count1;
 968         struct snd_rawmidi_file *rfile;
 969         struct snd_rawmidi_substream *substream;
 970         struct snd_rawmidi_runtime *runtime;
 971
 972         rfile = file->private_data;
 973         substream = rfile->input;
 974         if (substream == NULL)
 975                 return -EIO;
 976         runtime = substream->runtime;
 977         snd_rawmidi_input_trigger(substream, 1);
 978         result = 0;
 979         while (count > 0) {
 980                 spin_lock_irq(&runtime->lock);
 981                 while (!snd_rawmidi_ready(substream)) {
 982                         wait_queue_t wait;
 983                         if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
 984                                 spin_unlock_irq(&runtime->lock);
 985                                 return result > 0 ? result : -EAGAIN;
 986                         }
 987                         init_waitqueue_entry(&wait, current);
 988                         add_wait_queue(&runtime->sleep, &wait);
 989                         set_current_state(TASK_INTERRUPTIBLE);
 990                         spin_unlock_irq(&runtime->lock);
 991                         schedule();
 992                         remove_wait_queue(&runtime->sleep, &wait);
 993                         if (signal_pending(current))
 994                                 return result > 0 ? result : -ERESTARTSYS;
 995                         if (!runtime->avail)
 996                                 return result > 0 ? result : -EIO;
 997                         spin_lock_irq(&runtime->lock);
 998                 }
 999                 spin_unlock_irq(&runtime->lock);
1000                 count1 = snd_rawmidi_kernel_read1(substream,
1001                                                   (unsigned char __force *)buf,
1002                                                   count, 0);
1003                 if (count1 < 0)
1004                         return result > 0 ? result : count1;
1005                 result += count1;
1006                 buf += count1;
1007                 count -= count1;
1008         }
1009         return result;
1010 }
1011
1012 /**
1013  * snd_rawmidi_transmit_empty - check whether the output buffer is empty
1014  * @substream: the rawmidi substream
1015  *
1016  * Returns 1 if the internal output buffer is empty, 0 if not.
1017  */
1018 int snd_rawmidi_transmit_empty(struct snd_rawmidi_substream *substream)
1019 {
1020         struct snd_rawmidi_runtime *runtime = substream->runtime;
1021         int result;
1022         unsigned long flags;
1023
1024         if (runtime->buffer == NULL) {
1025                 snd_printd("snd_rawmidi_transmit_empty: output is not active!!!\n");
1026                 return 1;
1027         }
1028         spin_lock_irqsave(&runtime->lock, flags);
1029         result = runtime->avail >= runtime->buffer_size;
1030         spin_unlock_irqrestore(&runtime->lock, flags);
1031         return result;
1032 }
1033
1034 /**
1035  * snd_rawmidi_transmit_peek - copy data from the internal buffer
1036  * @substream: the rawmidi substream
1037  * @buffer: the buffer pointer
1038  * @count: data size to transfer
1039  *
1040  * Copies data from the internal output buffer to the given buffer.
1041  *
1042  * Call this in the interrupt handler when the midi output is ready,
1043  * and call snd_rawmidi_transmit_ack() after the transmission is
1044  * finished.
1045  *
1046  * Returns the size of copied data, or a negative error code on failure.
1047  */
1048 int snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
1049                               unsigned char *buffer, int count)
1050 {
1051         unsigned long flags;
1052         int result, count1;
1053         struct snd_rawmidi_runtime *runtime = substream->runtime;
1054
1055         if (runtime->buffer == NULL) {
1056                 snd_printd("snd_rawmidi_transmit_peek: output is not active!!!\n");
1057                 return -EINVAL;
1058         }
1059         result = 0;
1060         spin_lock_irqsave(&runtime->lock, flags);
1061         if (runtime->avail >= runtime->buffer_size) {
1062                 /* warning: lowlevel layer MUST trigger down the hardware */
1063                 goto __skip;
1064         }
1065         if (count == 1) {       /* special case, faster code */
1066                 *buffer = runtime->buffer[runtime->hw_ptr];
1067                 result++;
1068         } else {
1069                 count1 = runtime->buffer_size - runtime->hw_ptr;
1070                 if (count1 > count)
1071                         count1 = count;
1072                 if (count1 > (int)(runtime->buffer_size - runtime->avail))
1073                         count1 = runtime->buffer_size - runtime->avail;
1074                 memcpy(buffer, runtime->buffer + runtime->hw_ptr, count1);
1075                 count -= count1;
1076                 result += count1;
1077                 if (count > 0) {
1078                         if (count > (int)(runtime->buffer_size - runtime->avail - count1))
1079                                 count = runtime->buffer_size - runtime->avail - count1;
1080                         memcpy(buffer + count1, runtime->buffer, count);
1081                         result += count;
1082                 }
1083         }
1084       __skip:
1085         spin_unlock_irqrestore(&runtime->lock, flags);
1086         return result;
1087 }
1088
1089 /**
1090  * snd_rawmidi_transmit_ack - acknowledge the transmission
1091  * @substream: the rawmidi substream
1092  * @count: the tranferred count
1093  *
1094  * Advances the hardware pointer for the internal output buffer with
1095  * the given size and updates the condition.
1096  * Call after the transmission is finished.
1097  *
1098  * Returns the advanced size if successful, or a negative error code on failure.
1099  */
1100 int snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count)
1101 {
1102         unsigned long flags;
1103         struct snd_rawmidi_runtime *runtime = substream->runtime;
1104
1105         if (runtime->buffer == NULL) {
1106                 snd_printd("snd_rawmidi_transmit_ack: output is not active!!!\n");
1107                 return -EINVAL;
1108         }
1109         spin_lock_irqsave(&runtime->lock, flags);
1110         snd_assert(runtime->avail + count <= runtime->buffer_size, );
1111         runtime->hw_ptr += count;
1112         runtime->hw_ptr %= runtime->buffer_size;
1113         runtime->avail += count;
1114         substream->bytes += count;
1115         if (count > 0) {
1116                 if (runtime->drain || snd_rawmidi_ready(substream))
1117                         wake_up(&runtime->sleep);
1118         }
1119         spin_unlock_irqrestore(&runtime->lock, flags);
1120         return count;
1121 }
1122
1123 /**
1124  * snd_rawmidi_transmit - copy from the buffer to the device
1125  * @substream: the rawmidi substream
1126  * @buffer: the buffer pointer
1127  * @count: the data size to transfer
1128  *
1129  * Copies data from the buffer to the device and advances the pointer.
1130  *
1131  * Returns the copied size if successful, or a negative error code on failure.
1132  */
1133 int snd_rawmidi_transmit(struct snd_rawmidi_substream *substream,
1134                          unsigned char *buffer, int count)
1135 {
1136         count = snd_rawmidi_transmit_peek(substream, buffer, count);
1137         if (count < 0)
1138                 return count;
1139         return snd_rawmidi_transmit_ack(substream, count);
1140 }
1141
1142 static long snd_rawmidi_kernel_write1(struct snd_rawmidi_substream *substream,
1143                                       const unsigned char *buf, long count, int kernel)
1144 {
1145         unsigned long flags;
1146         long count1, result;
1147         struct snd_rawmidi_runtime *runtime = substream->runtime;
1148
1149         snd_assert(buf != NULL, return -EINVAL);
1150         snd_assert(runtime->buffer != NULL, return -EINVAL);
1151
1152         result = 0;
1153         spin_lock_irqsave(&runtime->lock, flags);
1154         if (substream->append) {
1155                 if ((long)runtime->avail < count) {
1156                         spin_unlock_irqrestore(&runtime->lock, flags);
1157                         return -EAGAIN;
1158                 }
1159         }
1160         while (count > 0 && runtime->avail > 0) {
1161                 count1 = runtime->buffer_size - runtime->appl_ptr;
1162                 if (count1 > count)
1163                         count1 = count;
1164                 if (count1 > (long)runtime->avail)
1165                         count1 = runtime->avail;
1166                 if (kernel) {
1167                         memcpy(runtime->buffer + runtime->appl_ptr, buf, count1);
1168                 } else {
1169                         spin_unlock_irqrestore(&runtime->lock, flags);
1170                         if (copy_from_user(runtime->buffer + runtime->appl_ptr,
1171                                            (char __user *)buf, count1)) {
1172                                 spin_lock_irqsave(&runtime->lock, flags);
1173                                 result = result > 0 ? result : -EFAULT;
1174                                 goto __end;
1175                         }
1176                         spin_lock_irqsave(&runtime->lock, flags);
1177                 }
1178                 runtime->appl_ptr += count1;
1179                 runtime->appl_ptr %= runtime->buffer_size;
1180                 runtime->avail -= count1;
1181                 result += count1;
1182                 buf += count1;
1183                 count -= count1;
1184         }
1185       __end:
1186         count1 = runtime->avail < runtime->buffer_size;
1187         spin_unlock_irqrestore(&runtime->lock, flags);
1188         if (count1)
1189                 snd_rawmidi_output_trigger(substream, 1);
1190         return result;
1191 }
1192
1193 long snd_rawmidi_kernel_write(struct snd_rawmidi_substream *substream,
1194                               const unsigned char *buf, long count)
1195 {
1196         return snd_rawmidi_kernel_write1(substream, buf, count, 1);
1197 }
1198
1199 static ssize_t snd_rawmidi_write(struct file *file, const char __user *buf,
1200                                  size_t count, loff_t *offset)
1201 {
1202         long result, timeout;
1203         int count1;
1204         struct snd_rawmidi_file *rfile;
1205         struct snd_rawmidi_runtime *runtime;
1206         struct snd_rawmidi_substream *substream;
1207
1208         rfile = file->private_data;
1209         substream = rfile->output;
1210         runtime = substream->runtime;
1211         /* we cannot put an atomic message to our buffer */
1212         if (substream->append && count > runtime->buffer_size)
1213                 return -EIO;
1214         result = 0;
1215         while (count > 0) {
1216                 spin_lock_irq(&runtime->lock);
1217                 while (!snd_rawmidi_ready_append(substream, count)) {
1218                         wait_queue_t wait;
1219                         if (file->f_flags & O_NONBLOCK) {
1220                                 spin_unlock_irq(&runtime->lock);
1221                                 return result > 0 ? result : -EAGAIN;
1222                         }
1223                         init_waitqueue_entry(&wait, current);
1224                         add_wait_queue(&runtime->sleep, &wait);
1225                         set_current_state(TASK_INTERRUPTIBLE);
1226                         spin_unlock_irq(&runtime->lock);
1227                         timeout = schedule_timeout(30 * HZ);
1228                         remove_wait_queue(&runtime->sleep, &wait);
1229                         if (signal_pending(current))
1230                                 return result > 0 ? result : -ERESTARTSYS;
1231                         if (!runtime->avail && !timeout)
1232                                 return result > 0 ? result : -EIO;
1233                         spin_lock_irq(&runtime->lock);
1234                 }
1235                 spin_unlock_irq(&runtime->lock);
1236                 count1 = snd_rawmidi_kernel_write1(substream,
1237                                                    (unsigned char __force *)buf,
1238                                                    count, 0);
1239                 if (count1 < 0)
1240                         return result > 0 ? result : count1;
1241                 result += count1;
1242                 buf += count1;
1243                 if ((size_t)count1 < count && (file->f_flags & O_NONBLOCK))
1244                         break;
1245                 count -= count1;
1246         }
1247         if (file->f_flags & O_SYNC) {
1248                 spin_lock_irq(&runtime->lock);
1249                 while (runtime->avail != runtime->buffer_size) {
1250                         wait_queue_t wait;
1251                         unsigned int last_avail = runtime->avail;
1252                         init_waitqueue_entry(&wait, current);
1253                         add_wait_queue(&runtime->sleep, &wait);
1254                         set_current_state(TASK_INTERRUPTIBLE);
1255                         spin_unlock_irq(&runtime->lock);
1256                         timeout = schedule_timeout(30 * HZ);
1257                         remove_wait_queue(&runtime->sleep, &wait);
1258                         if (signal_pending(current))
1259                                 return result > 0 ? result : -ERESTARTSYS;
1260                         if (runtime->avail == last_avail && !timeout)
1261                                 return result > 0 ? result : -EIO;
1262                         spin_lock_irq(&runtime->lock);
1263                 }
1264                 spin_unlock_irq(&runtime->lock);
1265         }
1266         return result;
1267 }
1268
1269 static unsigned int snd_rawmidi_poll(struct file *file, poll_table * wait)
1270 {
1271         struct snd_rawmidi_file *rfile;
1272         struct snd_rawmidi_runtime *runtime;
1273         unsigned int mask;
1274
1275         rfile = file->private_data;
1276         if (rfile->input != NULL) {
1277                 runtime = rfile->input->runtime;
1278                 snd_rawmidi_input_trigger(rfile->input, 1);
1279                 poll_wait(file, &runtime->sleep, wait);
1280         }
1281         if (rfile->output != NULL) {
1282                 runtime = rfile->output->runtime;
1283                 poll_wait(file, &runtime->sleep, wait);
1284         }
1285         mask = 0;
1286         if (rfile->input != NULL) {
1287                 if (snd_rawmidi_ready(rfile->input))
1288                         mask |= POLLIN | POLLRDNORM;
1289         }
1290         if (rfile->output != NULL) {
1291                 if (snd_rawmidi_ready(rfile->output))
1292                         mask |= POLLOUT | POLLWRNORM;
1293         }
1294         return mask;
1295 }
1296
1297 /*
1298  */
1299 #ifdef CONFIG_COMPAT
1300 #include "rawmidi_compat.c"
1301 #else
1302 #define snd_rawmidi_ioctl_compat        NULL
1303 #endif
1304
1305 /*
1306
1307  */
1308
1309 static void snd_rawmidi_proc_info_read(struct snd_info_entry *entry,
1310                                        struct snd_info_buffer *buffer)
1311 {
1312         struct snd_rawmidi *rmidi;
1313         struct snd_rawmidi_substream *substream;
1314         struct snd_rawmidi_runtime *runtime;
1315         struct list_head *list;
1316
1317         rmidi = entry->private_data;
1318         snd_iprintf(buffer, "%s\n\n", rmidi->name);
1319         mutex_lock(&rmidi->open_mutex);
1320         if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_OUTPUT) {
1321                 list_for_each(list, &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams) {
1322                         substream = list_entry(list, struct snd_rawmidi_substream, list);
1323                         snd_iprintf(buffer,
1324                                     "Output %d\n"
1325                                     "  Tx bytes     : %lu\n",
1326                                     substream->number,
1327                                     (unsigned long) substream->bytes);
1328                         if (substream->opened) {
1329                                 runtime = substream->runtime;
1330                                 snd_iprintf(buffer,
1331                                     "  Mode         : %s\n"
1332                                     "  Buffer size  : %lu\n"
1333                                     "  Avail        : %lu\n",
1334                                     runtime->oss ? "OSS compatible" : "native",
1335                                     (unsigned long) runtime->buffer_size,
1336                                     (unsigned long) runtime->avail);
1337                         }
1338                 }
1339         }
1340         if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_INPUT) {
1341                 list_for_each(list, &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams) {
1342                         substream = list_entry(list, struct snd_rawmidi_substream, list);
1343                         snd_iprintf(buffer,
1344                                     "Input %d\n"
1345                                     "  Rx bytes     : %lu\n",
1346                                     substream->number,
1347                                     (unsigned long) substream->bytes);
1348                         if (substream->opened) {
1349                                 runtime = substream->runtime;
1350                                 snd_iprintf(buffer,
1351                                             "  Buffer size  : %lu\n"
1352                                             "  Avail        : %lu\n"
1353                                             "  Overruns     : %lu\n",
1354                                             (unsigned long) runtime->buffer_size,
1355                                             (unsigned long) runtime->avail,
1356                                             (unsigned long) runtime->xruns);
1357                         }
1358                 }
1359         }
1360         mutex_unlock(&rmidi->open_mutex);
1361 }
1362
1363 /*
1364  *  Register functions
1365  */
1366
1367 static struct file_operations snd_rawmidi_f_ops =
1368 {
1369         .owner =        THIS_MODULE,
1370         .read =         snd_rawmidi_read,
1371         .write =        snd_rawmidi_write,
1372         .open =         snd_rawmidi_open,
1373         .release =      snd_rawmidi_release,
1374         .poll =         snd_rawmidi_poll,
1375         .unlocked_ioctl =       snd_rawmidi_ioctl,
1376         .compat_ioctl = snd_rawmidi_ioctl_compat,
1377 };
1378
1379 static int snd_rawmidi_alloc_substreams(struct snd_rawmidi *rmidi,
1380                                         struct snd_rawmidi_str *stream,
1381                                         int direction,
1382                                         int count)
1383 {
1384         struct snd_rawmidi_substream *substream;
1385         int idx;
1386
1387         INIT_LIST_HEAD(&stream->substreams);
1388         for (idx = 0; idx < count; idx++) {
1389                 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
1390                 if (substream == NULL) {
1391                         snd_printk(KERN_ERR "rawmidi: cannot allocate substream\n");
1392                         return -ENOMEM;
1393                 }
1394                 substream->stream = direction;
1395                 substream->number = idx;
1396                 substream->rmidi = rmidi;
1397                 substream->pstr = stream;
1398                 list_add_tail(&substream->list, &stream->substreams);
1399                 stream->substream_count++;
1400         }
1401         return 0;
1402 }
1403
1404 /**
1405  * snd_rawmidi_new - create a rawmidi instance
1406  * @card: the card instance
1407  * @id: the id string
1408  * @device: the device index
1409  * @output_count: the number of output streams
1410  * @input_count: the number of input streams
1411  * @rrawmidi: the pointer to store the new rawmidi instance
1412  *
1413  * Creates a new rawmidi instance.
1414  * Use snd_rawmidi_set_ops() to set the operators to the new instance.
1415  *
1416  * Returns zero if successful, or a negative error code on failure.
1417  */
1418 int snd_rawmidi_new(struct snd_card *card, char *id, int device,
1419                     int output_count, int input_count,
1420                     struct snd_rawmidi ** rrawmidi)
1421 {
1422         struct snd_rawmidi *rmidi;
1423         int err;
1424         static struct snd_device_ops ops = {
1425                 .dev_free = snd_rawmidi_dev_free,
1426                 .dev_register = snd_rawmidi_dev_register,
1427                 .dev_disconnect = snd_rawmidi_dev_disconnect,
1428         };
1429
1430         snd_assert(rrawmidi != NULL, return -EINVAL);
1431         *rrawmidi = NULL;
1432         snd_assert(card != NULL, return -ENXIO);
1433         rmidi = kzalloc(sizeof(*rmidi), GFP_KERNEL);
1434         if (rmidi == NULL) {
1435                 snd_printk(KERN_ERR "rawmidi: cannot allocate\n");
1436                 return -ENOMEM;
1437         }
1438         rmidi->card = card;
1439         rmidi->device = device;
1440         mutex_init(&rmidi->open_mutex);
1441         init_waitqueue_head(&rmidi->open_wait);
1442         if (id != NULL)
1443                 strlcpy(rmidi->id, id, sizeof(rmidi->id));
1444         if ((err = snd_rawmidi_alloc_substreams(rmidi,
1445                                                 &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT],
1446                                                 SNDRV_RAWMIDI_STREAM_INPUT,
1447                                                 input_count)) < 0) {
1448                 snd_rawmidi_free(rmidi);
1449                 return err;
1450         }
1451         if ((err = snd_rawmidi_alloc_substreams(rmidi,
1452                                                 &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT],
1453                                                 SNDRV_RAWMIDI_STREAM_OUTPUT,
1454                                                 output_count)) < 0) {
1455                 snd_rawmidi_free(rmidi);
1456                 return err;
1457         }
1458         if ((err = snd_device_new(card, SNDRV_DEV_RAWMIDI, rmidi, &ops)) < 0) {
1459                 snd_rawmidi_free(rmidi);
1460                 return err;
1461         }
1462         *rrawmidi = rmidi;
1463         return 0;
1464 }
1465
1466 static void snd_rawmidi_free_substreams(struct snd_rawmidi_str *stream)
1467 {
1468         struct snd_rawmidi_substream *substream;
1469
1470         while (!list_empty(&stream->substreams)) {
1471                 substream = list_entry(stream->substreams.next, struct snd_rawmidi_substream, list);
1472                 list_del(&substream->list);
1473                 kfree(substream);
1474         }
1475 }
1476
1477 static int snd_rawmidi_free(struct snd_rawmidi *rmidi)
1478 {
1479         snd_assert(rmidi != NULL, return -ENXIO);
1480
1481         snd_info_free_entry(rmidi->proc_entry);
1482         rmidi->proc_entry = NULL;
1483         mutex_lock(&register_mutex);
1484         if (rmidi->ops && rmidi->ops->dev_unregister)
1485                 rmidi->ops->dev_unregister(rmidi);
1486         mutex_unlock(&register_mutex);
1487
1488         snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT]);
1489         snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT]);
1490         if (rmidi->private_free)
1491                 rmidi->private_free(rmidi);
1492         kfree(rmidi);
1493         return 0;
1494 }
1495
1496 static int snd_rawmidi_dev_free(struct snd_device *device)
1497 {
1498         struct snd_rawmidi *rmidi = device->device_data;
1499         return snd_rawmidi_free(rmidi);
1500 }
1501
1502 #if defined(CONFIG_SND_SEQUENCER) || (defined(MODULE) && defined(CONFIG_SND_SEQUENCER_MODULE))
1503 static void snd_rawmidi_dev_seq_free(struct snd_seq_device *device)
1504 {
1505         struct snd_rawmidi *rmidi = device->private_data;
1506         rmidi->seq_dev = NULL;
1507 }
1508 #endif
1509
1510 static int snd_rawmidi_dev_register(struct snd_device *device)
1511 {
1512         int err;
1513         struct snd_info_entry *entry;
1514         char name[16];
1515         struct snd_rawmidi *rmidi = device->device_data;
1516
1517         if (rmidi->device >= SNDRV_RAWMIDI_DEVICES)
1518                 return -ENOMEM;
1519         mutex_lock(&register_mutex);
1520         if (snd_rawmidi_search(rmidi->card, rmidi->device)) {
1521                 mutex_unlock(&register_mutex);
1522                 return -EBUSY;
1523         }
1524         list_add_tail(&rmidi->list, &snd_rawmidi_devices);
1525         sprintf(name, "midiC%iD%i", rmidi->card->number, rmidi->device);
1526         if ((err = snd_register_device(SNDRV_DEVICE_TYPE_RAWMIDI,
1527                                        rmidi->card, rmidi->device,
1528                                        &snd_rawmidi_f_ops, rmidi, name)) < 0) {
1529                 snd_printk(KERN_ERR "unable to register rawmidi device %i:%i\n", rmidi->card->number, rmidi->device);
1530                 list_del(&rmidi->list);
1531                 mutex_unlock(&register_mutex);
1532                 return err;
1533         }
1534         if (rmidi->ops && rmidi->ops->dev_register &&
1535             (err = rmidi->ops->dev_register(rmidi)) < 0) {
1536                 snd_unregister_device(SNDRV_DEVICE_TYPE_RAWMIDI, rmidi->card, rmidi->device);
1537                 list_del(&rmidi->list);
1538                 mutex_unlock(&register_mutex);
1539                 return err;
1540         }
1541 #ifdef CONFIG_SND_OSSEMUL
1542         rmidi->ossreg = 0;
1543         if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1544                 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1545                                             rmidi->card, 0, &snd_rawmidi_f_ops,
1546                                             rmidi, name) < 0) {
1547                         snd_printk(KERN_ERR "unable to register OSS rawmidi device %i:%i\n", rmidi->card->number, 0);
1548                 } else {
1549                         rmidi->ossreg++;
1550 #ifdef SNDRV_OSS_INFO_DEV_MIDI
1551                         snd_oss_info_register(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number, rmidi->name);
1552 #endif
1553                 }
1554         }
1555         if ((int)rmidi->device == amidi_map[rmidi->card->number]) {
1556                 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1557                                             rmidi->card, 1, &snd_rawmidi_f_ops,
1558                                             rmidi, name) < 0) {
1559                         snd_printk(KERN_ERR "unable to register OSS rawmidi device %i:%i\n", rmidi->card->number, 1);
1560                 } else {
1561                         rmidi->ossreg++;
1562                 }
1563         }
1564 #endif /* CONFIG_SND_OSSEMUL */
1565         mutex_unlock(&register_mutex);
1566         sprintf(name, "midi%d", rmidi->device);
1567         entry = snd_info_create_card_entry(rmidi->card, name, rmidi->card->proc_root);
1568         if (entry) {
1569                 entry->private_data = rmidi;
1570                 entry->c.text.read = snd_rawmidi_proc_info_read;
1571                 if (snd_info_register(entry) < 0) {
1572                         snd_info_free_entry(entry);
1573                         entry = NULL;
1574                 }
1575         }
1576         rmidi->proc_entry = entry;
1577 #if defined(CONFIG_SND_SEQUENCER) || (defined(MODULE) && defined(CONFIG_SND_SEQUENCER_MODULE))
1578         if (!rmidi->ops || !rmidi->ops->dev_register) { /* own registration mechanism */
1579                 if (snd_seq_device_new(rmidi->card, rmidi->device, SNDRV_SEQ_DEV_ID_MIDISYNTH, 0, &rmidi->seq_dev) >= 0) {
1580                         rmidi->seq_dev->private_data = rmidi;
1581                         rmidi->seq_dev->private_free = snd_rawmidi_dev_seq_free;
1582                         sprintf(rmidi->seq_dev->name, "MIDI %d-%d", rmidi->card->number, rmidi->device);
1583                         snd_device_register(rmidi->card, rmidi->seq_dev);
1584                 }
1585         }
1586 #endif
1587         return 0;
1588 }
1589
1590 static int snd_rawmidi_dev_disconnect(struct snd_device *device)
1591 {
1592         struct snd_rawmidi *rmidi = device->device_data;
1593
1594         mutex_lock(&register_mutex);
1595         list_del_init(&rmidi->list);
1596 #ifdef CONFIG_SND_OSSEMUL
1597         if (rmidi->ossreg) {
1598                 if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1599                         snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 0);
1600 #ifdef SNDRV_OSS_INFO_DEV_MIDI
1601                         snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number);
1602 #endif
1603                 }
1604                 if ((int)rmidi->device == amidi_map[rmidi->card->number])
1605                         snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 1);
1606                 rmidi->ossreg = 0;
1607         }
1608 #endif /* CONFIG_SND_OSSEMUL */
1609         snd_unregister_device(SNDRV_DEVICE_TYPE_RAWMIDI, rmidi->card, rmidi->device);
1610         mutex_unlock(&register_mutex);
1611         return 0;
1612 }
1613
1614 /**
1615  * snd_rawmidi_set_ops - set the rawmidi operators
1616  * @rmidi: the rawmidi instance
1617  * @stream: the stream direction, SNDRV_RAWMIDI_STREAM_XXX
1618  * @ops: the operator table
1619  *
1620  * Sets the rawmidi operators for the given stream direction.
1621  */
1622 void snd_rawmidi_set_ops(struct snd_rawmidi *rmidi, int stream,
1623                          struct snd_rawmidi_ops *ops)
1624 {
1625         struct list_head *list;
1626         struct snd_rawmidi_substream *substream;
1627
1628         list_for_each(list, &rmidi->streams[stream].substreams) {
1629                 substream = list_entry(list, struct snd_rawmidi_substream, list);
1630                 substream->ops = ops;
1631         }
1632 }
1633
1634 /*
1635  *  ENTRY functions
1636  */
1637
1638 static int __init alsa_rawmidi_init(void)
1639 {
1640
1641         snd_ctl_register_ioctl(snd_rawmidi_control_ioctl);
1642         snd_ctl_register_ioctl_compat(snd_rawmidi_control_ioctl);
1643 #ifdef CONFIG_SND_OSSEMUL
1644         { int i;
1645         /* check device map table */
1646         for (i = 0; i < SNDRV_CARDS; i++) {
1647                 if (midi_map[i] < 0 || midi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1648                         snd_printk(KERN_ERR "invalid midi_map[%d] = %d\n", i, midi_map[i]);
1649                         midi_map[i] = 0;
1650                 }
1651                 if (amidi_map[i] < 0 || amidi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1652                         snd_printk(KERN_ERR "invalid amidi_map[%d] = %d\n", i, amidi_map[i]);
1653                         amidi_map[i] = 1;
1654                 }
1655         }
1656         }
1657 #endif /* CONFIG_SND_OSSEMUL */
1658         return 0;
1659 }
1660
1661 static void __exit alsa_rawmidi_exit(void)
1662 {
1663         snd_ctl_unregister_ioctl(snd_rawmidi_control_ioctl);
1664         snd_ctl_unregister_ioctl_compat(snd_rawmidi_control_ioctl);
1665 }
1666
1667 module_init(alsa_rawmidi_init)
1668 module_exit(alsa_rawmidi_exit)
1669
1670 EXPORT_SYMBOL(snd_rawmidi_output_params);
1671 EXPORT_SYMBOL(snd_rawmidi_input_params);
1672 EXPORT_SYMBOL(snd_rawmidi_drop_output);
1673 EXPORT_SYMBOL(snd_rawmidi_drain_output);
1674 EXPORT_SYMBOL(snd_rawmidi_drain_input);
1675 EXPORT_SYMBOL(snd_rawmidi_receive);
1676 EXPORT_SYMBOL(snd_rawmidi_transmit_empty);
1677 EXPORT_SYMBOL(snd_rawmidi_transmit_peek);
1678 EXPORT_SYMBOL(snd_rawmidi_transmit_ack);
1679 EXPORT_SYMBOL(snd_rawmidi_transmit);
1680 EXPORT_SYMBOL(snd_rawmidi_new);
1681 EXPORT_SYMBOL(snd_rawmidi_set_ops);
1682 EXPORT_SYMBOL(snd_rawmidi_info_select);
1683 EXPORT_SYMBOL(snd_rawmidi_kernel_open);
1684 EXPORT_SYMBOL(snd_rawmidi_kernel_release);
1685 EXPORT_SYMBOL(snd_rawmidi_kernel_read);
1686 EXPORT_SYMBOL(snd_rawmidi_kernel_write);