git.oblomov.eu Git - linux-2.6/blob - 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/moduleparam.h>
  32 #include <linux/delay.h>
  33 #include <linux/wait.h>
  34 #include <sound/rawmidi.h>
  35 #include <sound/info.h>
  36 #include <sound/control.h>
  37 #include <sound/minors.h>
  38 #include <sound/initval.h>
  39
  40 MODULE_AUTHOR("Jaroslav Kysela <perex@suse.cz>");
  41 MODULE_DESCRIPTION("Midlevel RawMidi code for ALSA.");
  42 MODULE_LICENSE("GPL");
  43
  44 #ifdef CONFIG_SND_OSSEMUL
  45 static int midi_map[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS-1)] = 0};
  46 static int amidi_map[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS-1)] = 1};
  47 module_param_array(midi_map, int, NULL, 0444);
  48 MODULE_PARM_DESC(midi_map, "Raw MIDI device number assigned to 1st OSS device.");
  49 module_param_array(amidi_map, int, NULL, 0444);
  50 MODULE_PARM_DESC(amidi_map, "Raw MIDI device number assigned to 2nd OSS device.");
  51 #endif /* CONFIG_SND_OSSEMUL */
  52
  53 static int snd_rawmidi_free(struct snd_rawmidi *rawmidi);
  54 static int snd_rawmidi_dev_free(struct snd_device *device);
  55 static int snd_rawmidi_dev_register(struct snd_device *device);
  56 static int snd_rawmidi_dev_disconnect(struct snd_device *device);
  57 static int snd_rawmidi_dev_unregister(struct snd_device *device);
  58
  59 static LIST_HEAD(snd_rawmidi_devices);
  60 static DECLARE_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         down(&register_mutex);
 241         rmidi = snd_rawmidi_search(card, device);
 242         up(&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                 down(&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                 up(&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                 up(&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         down(&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                 up(&rmidi->open_mutex);
 450                 schedule();
 451                 down(&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         up(&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         down(&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         up(&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         down(&register_mutex);
 580         rmidi = snd_rawmidi_search(card, info->device);
 581         up(&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                 if ((newbuf = (char *) kmalloc(params->buffer_size, GFP_KERNEL)) == NULL)
 634                         return -ENOMEM;
 635                 kfree(runtime->buffer);
 636                 runtime->buffer = newbuf;
 637                 runtime->buffer_size = params->buffer_size;
 638                 runtime->avail = runtime->buffer_size;
 639         }
 640         runtime->avail_min = params->avail_min;
 641         substream->active_sensing = !params->no_active_sensing;
 642         return 0;
 643 }
 644
 645 int snd_rawmidi_input_params(struct snd_rawmidi_substream *substream,
 646                              struct snd_rawmidi_params * params)
 647 {
 648         char *newbuf;
 649         struct snd_rawmidi_runtime *runtime = substream->runtime;
 650
 651         snd_rawmidi_drain_input(substream);
 652         if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L) {
 653                 return -EINVAL;
 654         }
 655         if (params->avail_min < 1 || params->avail_min > params->buffer_size) {
 656                 return -EINVAL;
 657         }
 658         if (params->buffer_size != runtime->buffer_size) {
 659                 if ((newbuf = (char *) kmalloc(params->buffer_size, GFP_KERNEL)) == NULL)
 660                         return -ENOMEM;
 661                 kfree(runtime->buffer);
 662                 runtime->buffer = newbuf;
 663                 runtime->buffer_size = params->buffer_size;
 664         }
 665         runtime->avail_min = params->avail_min;
 666         return 0;
 667 }
 668
 669 static int snd_rawmidi_output_status(struct snd_rawmidi_substream *substream,
 670                                      struct snd_rawmidi_status * status)
 671 {
 672         struct snd_rawmidi_runtime *runtime = substream->runtime;
 673
 674         memset(status, 0, sizeof(*status));
 675         status->stream = SNDRV_RAWMIDI_STREAM_OUTPUT;
 676         spin_lock_irq(&runtime->lock);
 677         status->avail = runtime->avail;
 678         spin_unlock_irq(&runtime->lock);
 679         return 0;
 680 }
 681
 682 static int snd_rawmidi_input_status(struct snd_rawmidi_substream *substream,
 683                                     struct snd_rawmidi_status * status)
 684 {
 685         struct snd_rawmidi_runtime *runtime = substream->runtime;
 686
 687         memset(status, 0, sizeof(*status));
 688         status->stream = SNDRV_RAWMIDI_STREAM_INPUT;
 689         spin_lock_irq(&runtime->lock);
 690         status->avail = runtime->avail;
 691         status->xruns = runtime->xruns;
 692         runtime->xruns = 0;
 693         spin_unlock_irq(&runtime->lock);
 694         return 0;
 695 }
 696
 697 static long snd_rawmidi_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 698 {
 699         struct snd_rawmidi_file *rfile;
 700         void __user *argp = (void __user *)arg;
 701
 702         rfile = file->private_data;
 703         if (((cmd >> 8) & 0xff) != 'W')
 704                 return -ENOTTY;
 705         switch (cmd) {
 706         case SNDRV_RAWMIDI_IOCTL_PVERSION:
 707                 return put_user(SNDRV_RAWMIDI_VERSION, (int __user *)argp) ? -EFAULT : 0;
 708         case SNDRV_RAWMIDI_IOCTL_INFO:
 709         {
 710                 int stream;
 711                 struct snd_rawmidi_info __user *info = argp;
 712                 if (get_user(stream, &info->stream))
 713                         return -EFAULT;
 714                 switch (stream) {
 715                 case SNDRV_RAWMIDI_STREAM_INPUT:
 716                         return snd_rawmidi_info_user(rfile->input, info);
 717                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
 718                         return snd_rawmidi_info_user(rfile->output, info);
 719                 default:
 720                         return -EINVAL;
 721                 }
 722         }
 723         case SNDRV_RAWMIDI_IOCTL_PARAMS:
 724         {
 725                 struct snd_rawmidi_params params;
 726                 if (copy_from_user(&params, argp, sizeof(struct snd_rawmidi_params)))
 727                         return -EFAULT;
 728                 switch (params.stream) {
 729                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
 730                         if (rfile->output == NULL)
 731                                 return -EINVAL;
 732                         return snd_rawmidi_output_params(rfile->output, &params);
 733                 case SNDRV_RAWMIDI_STREAM_INPUT:
 734                         if (rfile->input == NULL)
 735                                 return -EINVAL;
 736                         return snd_rawmidi_input_params(rfile->input, &params);
 737                 default:
 738                         return -EINVAL;
 739                 }
 740         }
 741         case SNDRV_RAWMIDI_IOCTL_STATUS:
 742         {
 743                 int err = 0;
 744                 struct snd_rawmidi_status status;
 745                 if (copy_from_user(&status, argp, sizeof(struct snd_rawmidi_status)))
 746                         return -EFAULT;
 747                 switch (status.stream) {
 748                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
 749                         if (rfile->output == NULL)
 750                                 return -EINVAL;
 751                         err = snd_rawmidi_output_status(rfile->output, &status);
 752                         break;
 753                 case SNDRV_RAWMIDI_STREAM_INPUT:
 754                         if (rfile->input == NULL)
 755                                 return -EINVAL;
 756                         err = snd_rawmidi_input_status(rfile->input, &status);
 757                         break;
 758                 default:
 759                         return -EINVAL;
 760                 }
 761                 if (err < 0)
 762                         return err;
 763                 if (copy_to_user(argp, &status, sizeof(struct snd_rawmidi_status)))
 764                         return -EFAULT;
 765                 return 0;
 766         }
 767         case SNDRV_RAWMIDI_IOCTL_DROP:
 768         {
 769                 int val;
 770                 if (get_user(val, (int __user *) argp))
 771                         return -EFAULT;
 772                 switch (val) {
 773                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
 774                         if (rfile->output == NULL)
 775                                 return -EINVAL;
 776                         return snd_rawmidi_drop_output(rfile->output);
 777                 default:
 778                         return -EINVAL;
 779                 }
 780         }
 781         case SNDRV_RAWMIDI_IOCTL_DRAIN:
 782         {
 783                 int val;
 784                 if (get_user(val, (int __user *) argp))
 785                         return -EFAULT;
 786                 switch (val) {
 787                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
 788                         if (rfile->output == NULL)
 789                                 return -EINVAL;
 790                         return snd_rawmidi_drain_output(rfile->output);
 791                 case SNDRV_RAWMIDI_STREAM_INPUT:
 792                         if (rfile->input == NULL)
 793                                 return -EINVAL;
 794                         return snd_rawmidi_drain_input(rfile->input);
 795                 default:
 796                         return -EINVAL;
 797                 }
 798         }
 799 #ifdef CONFIG_SND_DEBUG
 800         default:
 801                 snd_printk(KERN_WARNING "rawmidi: unknown command = 0x%x\n", cmd);
 802 #endif
 803         }
 804         return -ENOTTY;
 805 }
 806
 807 static int snd_rawmidi_control_ioctl(struct snd_card *card,
 808                                      struct snd_ctl_file *control,
 809                                      unsigned int cmd,
 810                                      unsigned long arg)
 811 {
 812         void __user *argp = (void __user *)arg;
 813
 814         switch (cmd) {
 815         case SNDRV_CTL_IOCTL_RAWMIDI_NEXT_DEVICE:
 816         {
 817                 int device;
 818
 819                 if (get_user(device, (int __user *)argp))
 820                         return -EFAULT;
 821                 down(&register_mutex);
 822                 device = device < 0 ? 0 : device + 1;
 823                 while (device < SNDRV_RAWMIDI_DEVICES) {
 824                         if (snd_rawmidi_search(card, device))
 825                                 break;
 826                         device++;
 827                 }
 828                 if (device == SNDRV_RAWMIDI_DEVICES)
 829                         device = -1;
 830                 up(&register_mutex);
 831                 if (put_user(device, (int __user *)argp))
 832                         return -EFAULT;
 833                 return 0;
 834         }
 835         case SNDRV_CTL_IOCTL_RAWMIDI_PREFER_SUBDEVICE:
 836         {
 837                 int val;
 838
 839                 if (get_user(val, (int __user *)argp))
 840                         return -EFAULT;
 841                 control->prefer_rawmidi_subdevice = val;
 842                 return 0;
 843         }
 844         case SNDRV_CTL_IOCTL_RAWMIDI_INFO:
 845                 return snd_rawmidi_info_select_user(card, argp);
 846         }
 847         return -ENOIOCTLCMD;
 848 }
 849
 850 /**
 851  * snd_rawmidi_receive - receive the input data from the device
 852  * @substream: the rawmidi substream
 853  * @buffer: the buffer pointer
 854  * @count: the data size to read
 855  *
 856  * Reads the data from the internal buffer.
 857  *
 858  * Returns the size of read data, or a negative error code on failure.
 859  */
 860 int snd_rawmidi_receive(struct snd_rawmidi_substream *substream,
 861                         const unsigned char *buffer, int count)
 862 {
 863         unsigned long flags;
 864         int result = 0, count1;
 865         struct snd_rawmidi_runtime *runtime = substream->runtime;
 866
 867         if (runtime->buffer == NULL) {
 868                 snd_printd("snd_rawmidi_receive: input is not active!!!\n");
 869                 return -EINVAL;
 870         }
 871         spin_lock_irqsave(&runtime->lock, flags);
 872         if (count == 1) {       /* special case, faster code */
 873                 substream->bytes++;
 874                 if (runtime->avail < runtime->buffer_size) {
 875                         runtime->buffer[runtime->hw_ptr++] = buffer[0];
 876                         runtime->hw_ptr %= runtime->buffer_size;
 877                         runtime->avail++;
 878                         result++;
 879                 } else {
 880                         runtime->xruns++;
 881                 }
 882         } else {
 883                 substream->bytes += count;
 884                 count1 = runtime->buffer_size - runtime->hw_ptr;
 885                 if (count1 > count)
 886                         count1 = count;
 887                 if (count1 > (int)(runtime->buffer_size - runtime->avail))
 888                         count1 = runtime->buffer_size - runtime->avail;
 889                 memcpy(runtime->buffer + runtime->hw_ptr, buffer, count1);
 890                 runtime->hw_ptr += count1;
 891                 runtime->hw_ptr %= runtime->buffer_size;
 892                 runtime->avail += count1;
 893                 count -= count1;
 894                 result += count1;
 895                 if (count > 0) {
 896                         buffer += count1;
 897                         count1 = count;
 898                         if (count1 > (int)(runtime->buffer_size - runtime->avail)) {
 899                                 count1 = runtime->buffer_size - runtime->avail;
 900                                 runtime->xruns += count - count1;
 901                         }
 902                         if (count1 > 0) {
 903                                 memcpy(runtime->buffer, buffer, count1);
 904                                 runtime->hw_ptr = count1;
 905                                 runtime->avail += count1;
 906                                 result += count1;
 907                         }
 908                 }
 909         }
 910         if (result > 0) {
 911                 if (runtime->event)
 912                         tasklet_hi_schedule(&runtime->tasklet);
 913                 else if (snd_rawmidi_ready(substream))
 914                         wake_up(&runtime->sleep);
 915         }
 916         spin_unlock_irqrestore(&runtime->lock, flags);
 917         return result;
 918 }
 919
 920 static long snd_rawmidi_kernel_read1(struct snd_rawmidi_substream *substream,
 921                                      unsigned char *buf, long count, int kernel)
 922 {
 923         unsigned long flags;
 924         long result = 0, count1;
 925         struct snd_rawmidi_runtime *runtime = substream->runtime;
 926
 927         while (count > 0 && runtime->avail) {
 928                 count1 = runtime->buffer_size - runtime->appl_ptr;
 929                 if (count1 > count)
 930                         count1 = count;
 931                 spin_lock_irqsave(&runtime->lock, flags);
 932                 if (count1 > (int)runtime->avail)
 933                         count1 = runtime->avail;
 934                 if (kernel) {
 935                         memcpy(buf + result, runtime->buffer + runtime->appl_ptr, count1);
 936                 } else {
 937                         spin_unlock_irqrestore(&runtime->lock, flags);
 938                         if (copy_to_user((char __user *)buf + result,
 939                                          runtime->buffer + runtime->appl_ptr, count1)) {
 940                                 return result > 0 ? result : -EFAULT;
 941                         }
 942                         spin_lock_irqsave(&runtime->lock, flags);
 943                 }
 944                 runtime->appl_ptr += count1;
 945                 runtime->appl_ptr %= runtime->buffer_size;
 946                 runtime->avail -= count1;
 947                 spin_unlock_irqrestore(&runtime->lock, flags);
 948                 result += count1;
 949                 count -= count1;
 950         }
 951         return result;
 952 }
 953
 954 long snd_rawmidi_kernel_read(struct snd_rawmidi_substream *substream,
 955                              unsigned char *buf, long count)
 956 {
 957         snd_rawmidi_input_trigger(substream, 1);
 958         return snd_rawmidi_kernel_read1(substream, buf, count, 1);
 959 }
 960
 961 static ssize_t snd_rawmidi_read(struct file *file, char __user *buf, size_t count,
 962                                 loff_t *offset)
 963 {
 964         long result;
 965         int count1;
 966         struct snd_rawmidi_file *rfile;
 967         struct snd_rawmidi_substream *substream;
 968         struct snd_rawmidi_runtime *runtime;
 969
 970         rfile = file->private_data;
 971         substream = rfile->input;
 972         if (substream == NULL)
 973                 return -EIO;
 974         runtime = substream->runtime;
 975         snd_rawmidi_input_trigger(substream, 1);
 976         result = 0;
 977         while (count > 0) {
 978                 spin_lock_irq(&runtime->lock);
 979                 while (!snd_rawmidi_ready(substream)) {
 980                         wait_queue_t wait;
 981                         if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
 982                                 spin_unlock_irq(&runtime->lock);
 983                                 return result > 0 ? result : -EAGAIN;
 984                         }
 985                         init_waitqueue_entry(&wait, current);
 986                         add_wait_queue(&runtime->sleep, &wait);
 987                         set_current_state(TASK_INTERRUPTIBLE);
 988                         spin_unlock_irq(&runtime->lock);
 989                         schedule();
 990                         remove_wait_queue(&runtime->sleep, &wait);
 991                         if (signal_pending(current))
 992                                 return result > 0 ? result : -ERESTARTSYS;
 993                         if (!runtime->avail)
 994                                 return result > 0 ? result : -EIO;
 995                         spin_lock_irq(&runtime->lock);
 996                 }
 997                 spin_unlock_irq(&runtime->lock);
 998                 count1 = snd_rawmidi_kernel_read1(substream,
 999                                                   (unsigned char __force *)buf,
1000                                                   count, 0);
1001                 if (count1 < 0)
1002                         return result > 0 ? result : count1;
1003                 result += count1;
1004                 buf += count1;
1005                 count -= count1;
1006         }
1007         return result;
1008 }
1009
1010 /**
1011  * snd_rawmidi_transmit_empty - check whether the output buffer is empty
1012  * @substream: the rawmidi substream
1013  *
1014  * Returns 1 if the internal output buffer is empty, 0 if not.
1015  */
1016 int snd_rawmidi_transmit_empty(struct snd_rawmidi_substream *substream)
1017 {
1018         struct snd_rawmidi_runtime *runtime = substream->runtime;
1019         int result;
1020         unsigned long flags;
1021
1022         if (runtime->buffer == NULL) {
1023                 snd_printd("snd_rawmidi_transmit_empty: output is not active!!!\n");
1024                 return 1;
1025         }
1026         spin_lock_irqsave(&runtime->lock, flags);
1027         result = runtime->avail >= runtime->buffer_size;
1028         spin_unlock_irqrestore(&runtime->lock, flags);
1029         return result;
1030 }
1031
1032 /**
1033  * snd_rawmidi_transmit_peek - copy data from the internal buffer
1034  * @substream: the rawmidi substream
1035  * @buffer: the buffer pointer
1036  * @count: data size to transfer
1037  *
1038  * Copies data from the internal output buffer to the given buffer.
1039  *
1040  * Call this in the interrupt handler when the midi output is ready,
1041  * and call snd_rawmidi_transmit_ack() after the transmission is
1042  * finished.
1043  *
1044  * Returns the size of copied data, or a negative error code on failure.
1045  */
1046 int snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
1047                               unsigned char *buffer, int count)
1048 {
1049         unsigned long flags;
1050         int result, count1;
1051         struct snd_rawmidi_runtime *runtime = substream->runtime;
1052
1053         if (runtime->buffer == NULL) {
1054                 snd_printd("snd_rawmidi_transmit_peek: output is not active!!!\n");
1055                 return -EINVAL;
1056         }
1057         result = 0;
1058         spin_lock_irqsave(&runtime->lock, flags);
1059         if (runtime->avail >= runtime->buffer_size) {
1060                 /* warning: lowlevel layer MUST trigger down the hardware */
1061                 goto __skip;
1062         }
1063         if (count == 1) {       /* special case, faster code */
1064                 *buffer = runtime->buffer[runtime->hw_ptr];
1065                 result++;
1066         } else {
1067                 count1 = runtime->buffer_size - runtime->hw_ptr;
1068                 if (count1 > count)
1069                         count1 = count;
1070                 if (count1 > (int)(runtime->buffer_size - runtime->avail))
1071                         count1 = runtime->buffer_size - runtime->avail;
1072                 memcpy(buffer, runtime->buffer + runtime->hw_ptr, count1);
1073                 count -= count1;
1074                 result += count1;
1075                 if (count > 0) {
1076                         if (count > (int)(runtime->buffer_size - runtime->avail - count1))
1077                                 count = runtime->buffer_size - runtime->avail - count1;
1078                         memcpy(buffer + count1, runtime->buffer, count);
1079                         result += count;
1080                 }
1081         }
1082       __skip:
1083         spin_unlock_irqrestore(&runtime->lock, flags);
1084         return result;
1085 }
1086
1087 /**
1088  * snd_rawmidi_transmit_ack - acknowledge the transmission
1089  * @substream: the rawmidi substream
1090  * @count: the tranferred count
1091  *
1092  * Advances the hardware pointer for the internal output buffer with
1093  * the given size and updates the condition.
1094  * Call after the transmission is finished.
1095  *
1096  * Returns the advanced size if successful, or a negative error code on failure.
1097  */
1098 int snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count)
1099 {
1100         unsigned long flags;
1101         struct snd_rawmidi_runtime *runtime = substream->runtime;
1102
1103         if (runtime->buffer == NULL) {
1104                 snd_printd("snd_rawmidi_transmit_ack: output is not active!!!\n");
1105                 return -EINVAL;
1106         }
1107         spin_lock_irqsave(&runtime->lock, flags);
1108         snd_assert(runtime->avail + count <= runtime->buffer_size, );
1109         runtime->hw_ptr += count;
1110         runtime->hw_ptr %= runtime->buffer_size;
1111         runtime->avail += count;
1112         substream->bytes += count;
1113         if (count > 0) {
1114                 if (runtime->drain || snd_rawmidi_ready(substream))
1115                         wake_up(&runtime->sleep);
1116         }
1117         spin_unlock_irqrestore(&runtime->lock, flags);
1118         return count;
1119 }
1120
1121 /**
1122  * snd_rawmidi_transmit - copy from the buffer to the device
1123  * @substream: the rawmidi substream
1124  * @buffer: the buffer pointer
1125  * @count: the data size to transfer
1126  *
1127  * Copies data from the buffer to the device and advances the pointer.
1128  *
1129  * Returns the copied size if successful, or a negative error code on failure.
1130  */
1131 int snd_rawmidi_transmit(struct snd_rawmidi_substream *substream,
1132                          unsigned char *buffer, int count)
1133 {
1134         count = snd_rawmidi_transmit_peek(substream, buffer, count);
1135         if (count < 0)
1136                 return count;
1137         return snd_rawmidi_transmit_ack(substream, count);
1138 }
1139
1140 static long snd_rawmidi_kernel_write1(struct snd_rawmidi_substream *substream,
1141                                       const unsigned char *buf, long count, int kernel)
1142 {
1143         unsigned long flags;
1144         long count1, result;
1145         struct snd_rawmidi_runtime *runtime = substream->runtime;
1146
1147         snd_assert(buf != NULL, return -EINVAL);
1148         snd_assert(runtime->buffer != NULL, return -EINVAL);
1149
1150         result = 0;
1151         spin_lock_irqsave(&runtime->lock, flags);
1152         if (substream->append) {
1153                 if ((long)runtime->avail < count) {
1154                         spin_unlock_irqrestore(&runtime->lock, flags);
1155                         return -EAGAIN;
1156                 }
1157         }
1158         while (count > 0 && runtime->avail > 0) {
1159                 count1 = runtime->buffer_size - runtime->appl_ptr;
1160                 if (count1 > count)
1161                         count1 = count;
1162                 if (count1 > (long)runtime->avail)
1163                         count1 = runtime->avail;
1164                 if (kernel) {
1165                         memcpy(runtime->buffer + runtime->appl_ptr, buf, count1);
1166                 } else {
1167                         spin_unlock_irqrestore(&runtime->lock, flags);
1168                         if (copy_from_user(runtime->buffer + runtime->appl_ptr,
1169                                            (char __user *)buf, count1)) {
1170                                 spin_lock_irqsave(&runtime->lock, flags);
1171                                 result = result > 0 ? result : -EFAULT;
1172                                 goto __end;
1173                         }
1174                         spin_lock_irqsave(&runtime->lock, flags);
1175                 }
1176                 runtime->appl_ptr += count1;
1177                 runtime->appl_ptr %= runtime->buffer_size;
1178                 runtime->avail -= count1;
1179                 result += count1;
1180                 buf += count1;
1181                 count -= count1;
1182         }
1183       __end:
1184         count1 = runtime->avail < runtime->buffer_size;
1185         spin_unlock_irqrestore(&runtime->lock, flags);
1186         if (count1)
1187                 snd_rawmidi_output_trigger(substream, 1);
1188         return result;
1189 }
1190
1191 long snd_rawmidi_kernel_write(struct snd_rawmidi_substream *substream,
1192                               const unsigned char *buf, long count)
1193 {
1194         return snd_rawmidi_kernel_write1(substream, buf, count, 1);
1195 }
1196
1197 static ssize_t snd_rawmidi_write(struct file *file, const char __user *buf,
1198                                  size_t count, loff_t *offset)
1199 {
1200         long result, timeout;
1201         int count1;
1202         struct snd_rawmidi_file *rfile;
1203         struct snd_rawmidi_runtime *runtime;
1204         struct snd_rawmidi_substream *substream;
1205
1206         rfile = file->private_data;
1207         substream = rfile->output;
1208         runtime = substream->runtime;
1209         /* we cannot put an atomic message to our buffer */
1210         if (substream->append && count > runtime->buffer_size)
1211                 return -EIO;
1212         result = 0;
1213         while (count > 0) {
1214                 spin_lock_irq(&runtime->lock);
1215                 while (!snd_rawmidi_ready_append(substream, count)) {
1216                         wait_queue_t wait;
1217                         if (file->f_flags & O_NONBLOCK) {
1218                                 spin_unlock_irq(&runtime->lock);
1219                                 return result > 0 ? result : -EAGAIN;
1220                         }
1221                         init_waitqueue_entry(&wait, current);
1222                         add_wait_queue(&runtime->sleep, &wait);
1223                         set_current_state(TASK_INTERRUPTIBLE);
1224                         spin_unlock_irq(&runtime->lock);
1225                         timeout = schedule_timeout(30 * HZ);
1226                         remove_wait_queue(&runtime->sleep, &wait);
1227                         if (signal_pending(current))
1228                                 return result > 0 ? result : -ERESTARTSYS;
1229                         if (!runtime->avail && !timeout)
1230                                 return result > 0 ? result : -EIO;
1231                         spin_lock_irq(&runtime->lock);
1232                 }
1233                 spin_unlock_irq(&runtime->lock);
1234                 count1 = snd_rawmidi_kernel_write1(substream,
1235                                                    (unsigned char __force *)buf,
1236                                                    count, 0);
1237                 if (count1 < 0)
1238                         return result > 0 ? result : count1;
1239                 result += count1;
1240                 buf += count1;
1241                 if ((size_t)count1 < count && (file->f_flags & O_NONBLOCK))
1242                         break;
1243                 count -= count1;
1244         }
1245         if (file->f_flags & O_SYNC) {
1246                 spin_lock_irq(&runtime->lock);
1247                 while (runtime->avail != runtime->buffer_size) {
1248                         wait_queue_t wait;
1249                         unsigned int last_avail = runtime->avail;
1250                         init_waitqueue_entry(&wait, current);
1251                         add_wait_queue(&runtime->sleep, &wait);
1252                         set_current_state(TASK_INTERRUPTIBLE);
1253                         spin_unlock_irq(&runtime->lock);
1254                         timeout = schedule_timeout(30 * HZ);
1255                         remove_wait_queue(&runtime->sleep, &wait);
1256                         if (signal_pending(current))
1257                                 return result > 0 ? result : -ERESTARTSYS;
1258                         if (runtime->avail == last_avail && !timeout)
1259                                 return result > 0 ? result : -EIO;
1260                         spin_lock_irq(&runtime->lock);
1261                 }
1262                 spin_unlock_irq(&runtime->lock);
1263         }
1264         return result;
1265 }
1266
1267 static unsigned int snd_rawmidi_poll(struct file *file, poll_table * wait)
1268 {
1269         struct snd_rawmidi_file *rfile;
1270         struct snd_rawmidi_runtime *runtime;
1271         unsigned int mask;
1272
1273         rfile = file->private_data;
1274         if (rfile->input != NULL) {
1275                 runtime = rfile->input->runtime;
1276                 snd_rawmidi_input_trigger(rfile->input, 1);
1277                 poll_wait(file, &runtime->sleep, wait);
1278         }
1279         if (rfile->output != NULL) {
1280                 runtime = rfile->output->runtime;
1281                 poll_wait(file, &runtime->sleep, wait);
1282         }
1283         mask = 0;
1284         if (rfile->input != NULL) {
1285                 if (snd_rawmidi_ready(rfile->input))
1286                         mask |= POLLIN | POLLRDNORM;
1287         }
1288         if (rfile->output != NULL) {
1289                 if (snd_rawmidi_ready(rfile->output))
1290                         mask |= POLLOUT | POLLWRNORM;
1291         }
1292         return mask;
1293 }
1294
1295 /*
1296  */
1297 #ifdef CONFIG_COMPAT
1298 #include "rawmidi_compat.c"
1299 #else
1300 #define snd_rawmidi_ioctl_compat        NULL
1301 #endif
1302
1303 /*
1304
1305  */
1306
1307 static void snd_rawmidi_proc_info_read(struct snd_info_entry *entry,
1308                                        struct snd_info_buffer *buffer)
1309 {
1310         struct snd_rawmidi *rmidi;
1311         struct snd_rawmidi_substream *substream;
1312         struct snd_rawmidi_runtime *runtime;
1313         struct list_head *list;
1314
1315         rmidi = entry->private_data;
1316         snd_iprintf(buffer, "%s\n\n", rmidi->name);
1317         down(&rmidi->open_mutex);
1318         if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_OUTPUT) {
1319                 list_for_each(list, &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams) {
1320                         substream = list_entry(list, struct snd_rawmidi_substream, list);
1321                         snd_iprintf(buffer,
1322                                     "Output %d\n"
1323                                     "  Tx bytes     : %lu\n",
1324                                     substream->number,
1325                                     (unsigned long) substream->bytes);
1326                         if (substream->opened) {
1327                                 runtime = substream->runtime;
1328                                 snd_iprintf(buffer,
1329                                     "  Mode         : %s\n"
1330                                     "  Buffer size  : %lu\n"
1331                                     "  Avail        : %lu\n",
1332                                     runtime->oss ? "OSS compatible" : "native",
1333                                     (unsigned long) runtime->buffer_size,
1334                                     (unsigned long) runtime->avail);
1335                         }
1336                 }
1337         }
1338         if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_INPUT) {
1339                 list_for_each(list, &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams) {
1340                         substream = list_entry(list, struct snd_rawmidi_substream, list);
1341                         snd_iprintf(buffer,
1342                                     "Input %d\n"
1343                                     "  Rx bytes     : %lu\n",
1344                                     substream->number,
1345                                     (unsigned long) substream->bytes);
1346                         if (substream->opened) {
1347                                 runtime = substream->runtime;
1348                                 snd_iprintf(buffer,
1349                                             "  Buffer size  : %lu\n"
1350                                             "  Avail        : %lu\n"
1351                                             "  Overruns     : %lu\n",
1352                                             (unsigned long) runtime->buffer_size,
1353                                             (unsigned long) runtime->avail,
1354                                             (unsigned long) runtime->xruns);
1355                         }
1356                 }
1357         }
1358         up(&rmidi->open_mutex);
1359 }
1360
1361 /*
1362  *  Register functions
1363  */
1364
1365 static struct file_operations snd_rawmidi_f_ops =
1366 {
1367         .owner =        THIS_MODULE,
1368         .read =         snd_rawmidi_read,
1369         .write =        snd_rawmidi_write,
1370         .open =         snd_rawmidi_open,
1371         .release =      snd_rawmidi_release,
1372         .poll =         snd_rawmidi_poll,
1373         .unlocked_ioctl =       snd_rawmidi_ioctl,
1374         .compat_ioctl = snd_rawmidi_ioctl_compat,
1375 };
1376
1377 static int snd_rawmidi_alloc_substreams(struct snd_rawmidi *rmidi,
1378                                         struct snd_rawmidi_str *stream,
1379                                         int direction,
1380                                         int count)
1381 {
1382         struct snd_rawmidi_substream *substream;
1383         int idx;
1384
1385         INIT_LIST_HEAD(&stream->substreams);
1386         for (idx = 0; idx < count; idx++) {
1387                 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
1388                 if (substream == NULL) {
1389                         snd_printk(KERN_ERR "rawmidi: cannot allocate substream\n");
1390                         return -ENOMEM;
1391                 }
1392                 substream->stream = direction;
1393                 substream->number = idx;
1394                 substream->rmidi = rmidi;
1395                 substream->pstr = stream;
1396                 list_add_tail(&substream->list, &stream->substreams);
1397                 stream->substream_count++;
1398         }
1399         return 0;
1400 }
1401
1402 /**
1403  * snd_rawmidi_new - create a rawmidi instance
1404  * @card: the card instance
1405  * @id: the id string
1406  * @device: the device index
1407  * @output_count: the number of output streams
1408  * @input_count: the number of input streams
1409  * @rrawmidi: the pointer to store the new rawmidi instance
1410  *
1411  * Creates a new rawmidi instance.
1412  * Use snd_rawmidi_set_ops() to set the operators to the new instance.
1413  *
1414  * Returns zero if successful, or a negative error code on failure.
1415  */
1416 int snd_rawmidi_new(struct snd_card *card, char *id, int device,
1417                     int output_count, int input_count,
1418                     struct snd_rawmidi ** rrawmidi)
1419 {
1420         struct snd_rawmidi *rmidi;
1421         int err;
1422         static struct snd_device_ops ops = {
1423                 .dev_free = snd_rawmidi_dev_free,
1424                 .dev_register = snd_rawmidi_dev_register,
1425                 .dev_disconnect = snd_rawmidi_dev_disconnect,
1426                 .dev_unregister = snd_rawmidi_dev_unregister
1427         };
1428
1429         snd_assert(rrawmidi != NULL, return -EINVAL);
1430         *rrawmidi = NULL;
1431         snd_assert(card != NULL, return -ENXIO);
1432         rmidi = kzalloc(sizeof(*rmidi), GFP_KERNEL);
1433         if (rmidi == NULL) {
1434                 snd_printk(KERN_ERR "rawmidi: cannot allocate\n");
1435                 return -ENOMEM;
1436         }
1437         rmidi->card = card;
1438         rmidi->device = device;
1439         init_MUTEX(&rmidi->open_mutex);
1440         init_waitqueue_head(&rmidi->open_wait);
1441         if (id != NULL)
1442                 strlcpy(rmidi->id, id, sizeof(rmidi->id));
1443         if ((err = snd_rawmidi_alloc_substreams(rmidi,
1444                                                 &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT],
1445                                                 SNDRV_RAWMIDI_STREAM_INPUT,
1446                                                 input_count)) < 0) {
1447                 snd_rawmidi_free(rmidi);
1448                 return err;
1449         }
1450         if ((err = snd_rawmidi_alloc_substreams(rmidi,
1451                                                 &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT],
1452                                                 SNDRV_RAWMIDI_STREAM_OUTPUT,
1453                                                 output_count)) < 0) {
1454                 snd_rawmidi_free(rmidi);
1455                 return err;
1456         }
1457         if ((err = snd_device_new(card, SNDRV_DEV_RAWMIDI, rmidi, &ops)) < 0) {
1458                 snd_rawmidi_free(rmidi);
1459                 return err;
1460         }
1461         *rrawmidi = rmidi;
1462         return 0;
1463 }
1464
1465 static void snd_rawmidi_free_substreams(struct snd_rawmidi_str *stream)
1466 {
1467         struct snd_rawmidi_substream *substream;
1468
1469         while (!list_empty(&stream->substreams)) {
1470                 substream = list_entry(stream->substreams.next, struct snd_rawmidi_substream, list);
1471                 list_del(&substream->list);
1472                 kfree(substream);
1473         }
1474 }
1475
1476 static int snd_rawmidi_free(struct snd_rawmidi *rmidi)
1477 {
1478         snd_assert(rmidi != NULL, return -ENXIO);
1479         snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT]);
1480         snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT]);
1481         if (rmidi->private_free)
1482                 rmidi->private_free(rmidi);
1483         kfree(rmidi);
1484         return 0;
1485 }
1486
1487 static int snd_rawmidi_dev_free(struct snd_device *device)
1488 {
1489         struct snd_rawmidi *rmidi = device->device_data;
1490         return snd_rawmidi_free(rmidi);
1491 }
1492
1493 #if defined(CONFIG_SND_SEQUENCER) || (defined(MODULE) && defined(CONFIG_SND_SEQUENCER_MODULE))
1494 static void snd_rawmidi_dev_seq_free(struct snd_seq_device *device)
1495 {
1496         struct snd_rawmidi *rmidi = device->private_data;
1497         rmidi->seq_dev = NULL;
1498 }
1499 #endif
1500
1501 static int snd_rawmidi_dev_register(struct snd_device *device)
1502 {
1503         int err;
1504         struct snd_info_entry *entry;
1505         char name[16];
1506         struct snd_rawmidi *rmidi = device->device_data;
1507
1508         if (rmidi->device >= SNDRV_RAWMIDI_DEVICES)
1509                 return -ENOMEM;
1510         down(&register_mutex);
1511         if (snd_rawmidi_search(rmidi->card, rmidi->device)) {
1512                 up(&register_mutex);
1513                 return -EBUSY;
1514         }
1515         list_add_tail(&rmidi->list, &snd_rawmidi_devices);
1516         sprintf(name, "midiC%iD%i", rmidi->card->number, rmidi->device);
1517         if ((err = snd_register_device(SNDRV_DEVICE_TYPE_RAWMIDI,
1518                                        rmidi->card, rmidi->device,
1519                                        &snd_rawmidi_f_ops, rmidi, name)) < 0) {
1520                 snd_printk(KERN_ERR "unable to register rawmidi device %i:%i\n", rmidi->card->number, rmidi->device);
1521                 list_del(&rmidi->list);
1522                 up(&register_mutex);
1523                 return err;
1524         }
1525         if (rmidi->ops && rmidi->ops->dev_register &&
1526             (err = rmidi->ops->dev_register(rmidi)) < 0) {
1527                 snd_unregister_device(SNDRV_DEVICE_TYPE_RAWMIDI, rmidi->card, rmidi->device);
1528                 list_del(&rmidi->list);
1529                 up(&register_mutex);
1530                 return err;
1531         }
1532 #ifdef CONFIG_SND_OSSEMUL
1533         rmidi->ossreg = 0;
1534         if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1535                 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1536                                             rmidi->card, 0, &snd_rawmidi_f_ops,
1537                                             rmidi, name) < 0) {
1538                         snd_printk(KERN_ERR "unable to register OSS rawmidi device %i:%i\n", rmidi->card->number, 0);
1539                 } else {
1540                         rmidi->ossreg++;
1541 #ifdef SNDRV_OSS_INFO_DEV_MIDI
1542                         snd_oss_info_register(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number, rmidi->name);
1543 #endif
1544                 }
1545         }
1546         if ((int)rmidi->device == amidi_map[rmidi->card->number]) {
1547                 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1548                                             rmidi->card, 1, &snd_rawmidi_f_ops,
1549                                             rmidi, name) < 0) {
1550                         snd_printk(KERN_ERR "unable to register OSS rawmidi device %i:%i\n", rmidi->card->number, 1);
1551                 } else {
1552                         rmidi->ossreg++;
1553                 }
1554         }
1555 #endif /* CONFIG_SND_OSSEMUL */
1556         up(&register_mutex);
1557         sprintf(name, "midi%d", rmidi->device);
1558         entry = snd_info_create_card_entry(rmidi->card, name, rmidi->card->proc_root);
1559         if (entry) {
1560                 entry->private_data = rmidi;
1561                 entry->c.text.read_size = 1024;
1562                 entry->c.text.read = snd_rawmidi_proc_info_read;
1563                 if (snd_info_register(entry) < 0) {
1564                         snd_info_free_entry(entry);
1565                         entry = NULL;
1566                 }
1567         }
1568         rmidi->proc_entry = entry;
1569 #if defined(CONFIG_SND_SEQUENCER) || (defined(MODULE) && defined(CONFIG_SND_SEQUENCER_MODULE))
1570         if (!rmidi->ops || !rmidi->ops->dev_register) { /* own registration mechanism */
1571                 if (snd_seq_device_new(rmidi->card, rmidi->device, SNDRV_SEQ_DEV_ID_MIDISYNTH, 0, &rmidi->seq_dev) >= 0) {
1572                         rmidi->seq_dev->private_data = rmidi;
1573                         rmidi->seq_dev->private_free = snd_rawmidi_dev_seq_free;
1574                         sprintf(rmidi->seq_dev->name, "MIDI %d-%d", rmidi->card->number, rmidi->device);
1575                         snd_device_register(rmidi->card, rmidi->seq_dev);
1576                 }
1577         }
1578 #endif
1579         return 0;
1580 }
1581
1582 static int snd_rawmidi_dev_disconnect(struct snd_device *device)
1583 {
1584         struct snd_rawmidi *rmidi = device->device_data;
1585
1586         down(&register_mutex);
1587         list_del_init(&rmidi->list);
1588         up(&register_mutex);
1589         return 0;
1590 }
1591
1592 static int snd_rawmidi_dev_unregister(struct snd_device *device)
1593 {
1594         struct snd_rawmidi *rmidi = device->device_data;
1595
1596         snd_assert(rmidi != NULL, return -ENXIO);
1597         down(&register_mutex);
1598         list_del(&rmidi->list);
1599         if (rmidi->proc_entry) {
1600                 snd_info_unregister(rmidi->proc_entry);
1601                 rmidi->proc_entry = NULL;
1602         }
1603 #ifdef CONFIG_SND_OSSEMUL
1604         if (rmidi->ossreg) {
1605                 if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1606                         snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 0);
1607 #ifdef SNDRV_OSS_INFO_DEV_MIDI
1608                         snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number);
1609 #endif
1610                 }
1611                 if ((int)rmidi->device == amidi_map[rmidi->card->number])
1612                         snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 1);
1613                 rmidi->ossreg = 0;
1614         }
1615 #endif /* CONFIG_SND_OSSEMUL */
1616         if (rmidi->ops && rmidi->ops->dev_unregister)
1617                 rmidi->ops->dev_unregister(rmidi);
1618         snd_unregister_device(SNDRV_DEVICE_TYPE_RAWMIDI, rmidi->card, rmidi->device);
1619         up(&register_mutex);
1620 #if defined(CONFIG_SND_SEQUENCER) || (defined(MODULE) && defined(CONFIG_SND_SEQUENCER_MODULE))
1621         if (rmidi->seq_dev) {
1622                 snd_device_free(rmidi->card, rmidi->seq_dev);
1623                 rmidi->seq_dev = NULL;
1624         }
1625 #endif
1626         return snd_rawmidi_free(rmidi);
1627 }
1628
1629 /**
1630  * snd_rawmidi_set_ops - set the rawmidi operators
1631  * @rmidi: the rawmidi instance
1632  * @stream: the stream direction, SNDRV_RAWMIDI_STREAM_XXX
1633  * @ops: the operator table
1634  *
1635  * Sets the rawmidi operators for the given stream direction.
1636  */
1637 void snd_rawmidi_set_ops(struct snd_rawmidi *rmidi, int stream,
1638                          struct snd_rawmidi_ops *ops)
1639 {
1640         struct list_head *list;
1641         struct snd_rawmidi_substream *substream;
1642
1643         list_for_each(list, &rmidi->streams[stream].substreams) {
1644                 substream = list_entry(list, struct snd_rawmidi_substream, list);
1645                 substream->ops = ops;
1646         }
1647 }
1648
1649 /*
1650  *  ENTRY functions
1651  */
1652
1653 static int __init alsa_rawmidi_init(void)
1654 {
1655
1656         snd_ctl_register_ioctl(snd_rawmidi_control_ioctl);
1657         snd_ctl_register_ioctl_compat(snd_rawmidi_control_ioctl);
1658 #ifdef CONFIG_SND_OSSEMUL
1659         { int i;
1660         /* check device map table */
1661         for (i = 0; i < SNDRV_CARDS; i++) {
1662                 if (midi_map[i] < 0 || midi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1663                         snd_printk(KERN_ERR "invalid midi_map[%d] = %d\n", i, midi_map[i]);
1664                         midi_map[i] = 0;
1665                 }
1666                 if (amidi_map[i] < 0 || amidi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1667                         snd_printk(KERN_ERR "invalid amidi_map[%d] = %d\n", i, amidi_map[i]);
1668                         amidi_map[i] = 1;
1669                 }
1670         }
1671         }
1672 #endif /* CONFIG_SND_OSSEMUL */
1673         return 0;
1674 }
1675
1676 static void __exit alsa_rawmidi_exit(void)
1677 {
1678         snd_ctl_unregister_ioctl(snd_rawmidi_control_ioctl);
1679         snd_ctl_unregister_ioctl_compat(snd_rawmidi_control_ioctl);
1680 }
1681
1682 module_init(alsa_rawmidi_init)
1683 module_exit(alsa_rawmidi_exit)
1684
1685 EXPORT_SYMBOL(snd_rawmidi_output_params);
1686 EXPORT_SYMBOL(snd_rawmidi_input_params);
1687 EXPORT_SYMBOL(snd_rawmidi_drop_output);
1688 EXPORT_SYMBOL(snd_rawmidi_drain_output);
1689 EXPORT_SYMBOL(snd_rawmidi_drain_input);
1690 EXPORT_SYMBOL(snd_rawmidi_receive);
1691 EXPORT_SYMBOL(snd_rawmidi_transmit_empty);
1692 EXPORT_SYMBOL(snd_rawmidi_transmit_peek);
1693 EXPORT_SYMBOL(snd_rawmidi_transmit_ack);
1694 EXPORT_SYMBOL(snd_rawmidi_transmit);
1695 EXPORT_SYMBOL(snd_rawmidi_new);
1696 EXPORT_SYMBOL(snd_rawmidi_set_ops);
1697 EXPORT_SYMBOL(snd_rawmidi_info_select);
1698 EXPORT_SYMBOL(snd_rawmidi_kernel_open);
1699 EXPORT_SYMBOL(snd_rawmidi_kernel_release);
1700 EXPORT_SYMBOL(snd_rawmidi_kernel_read);
1701 EXPORT_SYMBOL(snd_rawmidi_kernel_write);