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 static int snd_rawmidi_dev_unregister(struct snd_device *device);
  59
  60 static LIST_HEAD(snd_rawmidi_devices);
  61 static DEFINE_MUTEX(register_mutex);
  62
  63 static struct snd_rawmidi *snd_rawmidi_search(struct snd_card *card, int device)
  64 {
  65         struct list_head *p;
  66         struct snd_rawmidi *rawmidi;
  67
  68         list_for_each(p, &snd_rawmidi_devices) {
  69                 rawmidi = list_entry(p, struct snd_rawmidi, list);
  70                 if (rawmidi->card == card && rawmidi->device == device)
  71                         return rawmidi;
  72         }
  73         return NULL;
  74 }
  75
  76 static inline unsigned short snd_rawmidi_file_flags(struct file *file)
  77 {
  78         switch (file->f_mode & (FMODE_READ | FMODE_WRITE)) {
  79         case FMODE_WRITE:
  80                 return SNDRV_RAWMIDI_LFLG_OUTPUT;
  81         case FMODE_READ:
  82                 return SNDRV_RAWMIDI_LFLG_INPUT;
  83         default:
  84                 return SNDRV_RAWMIDI_LFLG_OPEN;
  85         }
  86 }
  87
  88 static inline int snd_rawmidi_ready(struct snd_rawmidi_substream *substream)
  89 {
  90         struct snd_rawmidi_runtime *runtime = substream->runtime;
  91         return runtime->avail >= runtime->avail_min;
  92 }
  93
  94 static inline int snd_rawmidi_ready_append(struct snd_rawmidi_substream *substream,
  95                                            size_t count)
  96 {
  97         struct snd_rawmidi_runtime *runtime = substream->runtime;
  98         return runtime->avail >= runtime->avail_min &&
  99                (!substream->append || runtime->avail >= count);
 100 }
 101
 102 static void snd_rawmidi_input_event_tasklet(unsigned long data)
 103 {
 104         struct snd_rawmidi_substream *substream = (struct snd_rawmidi_substream *)data;
 105         substream->runtime->event(substream);
 106 }
 107
 108 static void snd_rawmidi_output_trigger_tasklet(unsigned long data)
 109 {
 110         struct snd_rawmidi_substream *substream = (struct snd_rawmidi_substream *)data;
 111         substream->ops->trigger(substream, 1);
 112 }
 113
 114 static int snd_rawmidi_runtime_create(struct snd_rawmidi_substream *substream)
 115 {
 116         struct snd_rawmidi_runtime *runtime;
 117
 118         if ((runtime = kzalloc(sizeof(*runtime), GFP_KERNEL)) == NULL)
 119                 return -ENOMEM;
 120         spin_lock_init(&runtime->lock);
 121         init_waitqueue_head(&runtime->sleep);
 122         if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
 123                 tasklet_init(&runtime->tasklet,
 124                              snd_rawmidi_input_event_tasklet,
 125                              (unsigned long)substream);
 126         else
 127                 tasklet_init(&runtime->tasklet,
 128                              snd_rawmidi_output_trigger_tasklet,
 129                              (unsigned long)substream);
 130         runtime->event = NULL;
 131         runtime->buffer_size = PAGE_SIZE;
 132         runtime->avail_min = 1;
 133         if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
 134                 runtime->avail = 0;
 135         else
 136                 runtime->avail = runtime->buffer_size;
 137         if ((runtime->buffer = kmalloc(runtime->buffer_size, GFP_KERNEL)) == NULL) {
 138                 kfree(runtime);
 139                 return -ENOMEM;
 140         }
 141         runtime->appl_ptr = runtime->hw_ptr = 0;
 142         substream->runtime = runtime;
 143         return 0;
 144 }
 145
 146 static int snd_rawmidi_runtime_free(struct snd_rawmidi_substream *substream)
 147 {
 148         struct snd_rawmidi_runtime *runtime = substream->runtime;
 149
 150         kfree(runtime->buffer);
 151         kfree(runtime);
 152         substream->runtime = NULL;
 153         return 0;
 154 }
 155
 156 static inline void snd_rawmidi_output_trigger(struct snd_rawmidi_substream *substream,int up)
 157 {
 158         if (up) {
 159                 tasklet_hi_schedule(&substream->runtime->tasklet);
 160         } else {
 161                 tasklet_kill(&substream->runtime->tasklet);
 162                 substream->ops->trigger(substream, 0);
 163         }
 164 }
 165
 166 static void snd_rawmidi_input_trigger(struct snd_rawmidi_substream *substream, int up)
 167 {
 168         substream->ops->trigger(substream, up);
 169         if (!up && substream->runtime->event)
 170                 tasklet_kill(&substream->runtime->tasklet);
 171 }
 172
 173 int snd_rawmidi_drop_output(struct snd_rawmidi_substream *substream)
 174 {
 175         unsigned long flags;
 176         struct snd_rawmidi_runtime *runtime = substream->runtime;
 177
 178         snd_rawmidi_output_trigger(substream, 0);
 179         runtime->drain = 0;
 180         spin_lock_irqsave(&runtime->lock, flags);
 181         runtime->appl_ptr = runtime->hw_ptr = 0;
 182         runtime->avail = runtime->buffer_size;
 183         spin_unlock_irqrestore(&runtime->lock, flags);
 184         return 0;
 185 }
 186
 187 int snd_rawmidi_drain_output(struct snd_rawmidi_substream *substream)
 188 {
 189         int err;
 190         long timeout;
 191         struct snd_rawmidi_runtime *runtime = substream->runtime;
 192
 193         err = 0;
 194         runtime->drain = 1;
 195         timeout = wait_event_interruptible_timeout(runtime->sleep,
 196                                 (runtime->avail >= runtime->buffer_size),
 197                                 10*HZ);
 198         if (signal_pending(current))
 199                 err = -ERESTARTSYS;
 200         if (runtime->avail < runtime->buffer_size && !timeout) {
 201                 snd_printk(KERN_WARNING "rawmidi drain error (avail = %li, buffer_size = %li)\n", (long)runtime->avail, (long)runtime->buffer_size);
 202                 err = -EIO;
 203         }
 204         runtime->drain = 0;
 205         if (err != -ERESTARTSYS) {
 206                 /* we need wait a while to make sure that Tx FIFOs are empty */
 207                 if (substream->ops->drain)
 208                         substream->ops->drain(substream);
 209                 else
 210                         msleep(50);
 211                 snd_rawmidi_drop_output(substream);
 212         }
 213         return err;
 214 }
 215
 216 int snd_rawmidi_drain_input(struct snd_rawmidi_substream *substream)
 217 {
 218         unsigned long flags;
 219         struct snd_rawmidi_runtime *runtime = substream->runtime;
 220
 221         snd_rawmidi_input_trigger(substream, 0);
 222         runtime->drain = 0;
 223         spin_lock_irqsave(&runtime->lock, flags);
 224         runtime->appl_ptr = runtime->hw_ptr = 0;
 225         runtime->avail = 0;
 226         spin_unlock_irqrestore(&runtime->lock, flags);
 227         return 0;
 228 }
 229
 230 int snd_rawmidi_kernel_open(struct snd_card *card, int device, int subdevice,
 231                             int mode, struct snd_rawmidi_file * rfile)
 232 {
 233         struct snd_rawmidi *rmidi;
 234         struct list_head *list1, *list2;
 235         struct snd_rawmidi_substream *sinput = NULL, *soutput = NULL;
 236         struct snd_rawmidi_runtime *input = NULL, *output = NULL;
 237         int err;
 238
 239         if (rfile)
 240                 rfile->input = rfile->output = NULL;
 241         mutex_lock(&register_mutex);
 242         rmidi = snd_rawmidi_search(card, device);
 243         mutex_unlock(&register_mutex);
 244         if (rmidi == NULL) {
 245                 err = -ENODEV;
 246                 goto __error1;
 247         }
 248         if (!try_module_get(rmidi->card->module)) {
 249                 err = -EFAULT;
 250                 goto __error1;
 251         }
 252         if (!(mode & SNDRV_RAWMIDI_LFLG_NOOPENLOCK))
 253                 mutex_lock(&rmidi->open_mutex);
 254         if (mode & SNDRV_RAWMIDI_LFLG_INPUT) {
 255                 if (!(rmidi->info_flags & SNDRV_RAWMIDI_INFO_INPUT)) {
 256                         err = -ENXIO;
 257                         goto __error;
 258                 }
 259                 if (subdevice >= 0 && (unsigned int)subdevice >= rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substream_count) {
 260                         err = -ENODEV;
 261                         goto __error;
 262                 }
 263                 if (rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substream_opened >=
 264                     rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substream_count) {
 265                         err = -EAGAIN;
 266                         goto __error;
 267                 }
 268         }
 269         if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) {
 270                 if (!(rmidi->info_flags & SNDRV_RAWMIDI_INFO_OUTPUT)) {
 271                         err = -ENXIO;
 272                         goto __error;
 273                 }
 274                 if (subdevice >= 0 && (unsigned int)subdevice >= rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substream_count) {
 275                         err = -ENODEV;
 276                         goto __error;
 277                 }
 278                 if (rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substream_opened >=
 279                     rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substream_count) {
 280                         err = -EAGAIN;
 281                         goto __error;
 282                 }
 283         }
 284         list1 = rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams.next;
 285         while (1) {
 286                 if (list1 == &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams) {
 287                         sinput = NULL;
 288                         if (mode & SNDRV_RAWMIDI_LFLG_INPUT) {
 289                                 err = -EAGAIN;
 290                                 goto __error;
 291                         }
 292                         break;
 293                 }
 294                 sinput = list_entry(list1, struct snd_rawmidi_substream, list);
 295                 if ((mode & SNDRV_RAWMIDI_LFLG_INPUT) && sinput->opened)
 296                         goto __nexti;
 297                 if (subdevice < 0 || (subdevice >= 0 && subdevice == sinput->number))
 298                         break;
 299               __nexti:
 300                 list1 = list1->next;
 301         }
 302         list2 = rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams.next;
 303         while (1) {
 304                 if (list2 == &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams) {
 305                         soutput = NULL;
 306                         if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) {
 307                                 err = -EAGAIN;
 308                                 goto __error;
 309                         }
 310                         break;
 311                 }
 312                 soutput = list_entry(list2, struct snd_rawmidi_substream, list);
 313                 if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) {
 314                         if (mode & SNDRV_RAWMIDI_LFLG_APPEND) {
 315                                 if (soutput->opened && !soutput->append)
 316                                         goto __nexto;
 317                         } else {
 318                                 if (soutput->opened)
 319                                         goto __nexto;
 320                         }
 321                 }
 322                 if (subdevice < 0 || (subdevice >= 0 && subdevice == soutput->number))
 323                         break;
 324               __nexto:
 325                 list2 = list2->next;
 326         }
 327         if (mode & SNDRV_RAWMIDI_LFLG_INPUT) {
 328                 if ((err = snd_rawmidi_runtime_create(sinput)) < 0)
 329                         goto __error;
 330                 input = sinput->runtime;
 331                 if ((err = sinput->ops->open(sinput)) < 0)
 332                         goto __error;
 333                 sinput->opened = 1;
 334                 rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substream_opened++;
 335         } else {
 336                 sinput = NULL;
 337         }
 338         if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) {
 339                 if (soutput->opened)
 340                         goto __skip_output;
 341                 if ((err = snd_rawmidi_runtime_create(soutput)) < 0) {
 342                         if (mode & SNDRV_RAWMIDI_LFLG_INPUT)
 343                                 sinput->ops->close(sinput);
 344                         goto __error;
 345                 }
 346                 output = soutput->runtime;
 347                 if ((err = soutput->ops->open(soutput)) < 0) {
 348                         if (mode & SNDRV_RAWMIDI_LFLG_INPUT)
 349                                 sinput->ops->close(sinput);
 350                         goto __error;
 351                 }
 352               __skip_output:
 353                 soutput->opened = 1;
 354                 if (mode & SNDRV_RAWMIDI_LFLG_APPEND)
 355                         soutput->append = 1;
 356                 if (soutput->use_count++ == 0)
 357                         soutput->active_sensing = 1;
 358                 rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substream_opened++;
 359         } else {
 360                 soutput = NULL;
 361         }
 362         if (!(mode & SNDRV_RAWMIDI_LFLG_NOOPENLOCK))
 363                 mutex_unlock(&rmidi->open_mutex);
 364         if (rfile) {
 365                 rfile->rmidi = rmidi;
 366                 rfile->input = sinput;
 367                 rfile->output = soutput;
 368         }
 369         return 0;
 370
 371       __error:
 372         if (input != NULL)
 373                 snd_rawmidi_runtime_free(sinput);
 374         if (output != NULL)
 375                 snd_rawmidi_runtime_free(soutput);
 376         module_put(rmidi->card->module);
 377         if (!(mode & SNDRV_RAWMIDI_LFLG_NOOPENLOCK))
 378                 mutex_unlock(&rmidi->open_mutex);
 379       __error1:
 380         return err;
 381 }
 382
 383 static int snd_rawmidi_open(struct inode *inode, struct file *file)
 384 {
 385         int maj = imajor(inode);
 386         struct snd_card *card;
 387         int subdevice;
 388         unsigned short fflags;
 389         int err;
 390         struct snd_rawmidi *rmidi;
 391         struct snd_rawmidi_file *rawmidi_file;
 392         wait_queue_t wait;
 393         struct list_head *list;
 394         struct snd_ctl_file *kctl;
 395
 396         if (maj == snd_major) {
 397                 rmidi = snd_lookup_minor_data(iminor(inode),
 398                                               SNDRV_DEVICE_TYPE_RAWMIDI);
 399 #ifdef CONFIG_SND_OSSEMUL
 400         } else if (maj == SOUND_MAJOR) {
 401                 rmidi = snd_lookup_oss_minor_data(iminor(inode),
 402                                                   SNDRV_OSS_DEVICE_TYPE_MIDI);
 403 #endif
 404         } else
 405                 return -ENXIO;
 406
 407         if (rmidi == NULL)
 408                 return -ENODEV;
 409         if ((file->f_flags & O_APPEND) && !(file->f_flags & O_NONBLOCK))
 410                 return -EINVAL;         /* invalid combination */
 411         card = rmidi->card;
 412         err = snd_card_file_add(card, file);
 413         if (err < 0)
 414                 return -ENODEV;
 415         fflags = snd_rawmidi_file_flags(file);
 416         if ((file->f_flags & O_APPEND) || maj == SOUND_MAJOR) /* OSS emul? */
 417                 fflags |= SNDRV_RAWMIDI_LFLG_APPEND;
 418         fflags |= SNDRV_RAWMIDI_LFLG_NOOPENLOCK;
 419         rawmidi_file = kmalloc(sizeof(*rawmidi_file), GFP_KERNEL);
 420         if (rawmidi_file == NULL) {
 421                 snd_card_file_remove(card, file);
 422                 return -ENOMEM;
 423         }
 424         init_waitqueue_entry(&wait, current);
 425         add_wait_queue(&rmidi->open_wait, &wait);
 426         mutex_lock(&rmidi->open_mutex);
 427         while (1) {
 428                 subdevice = -1;
 429                 down_read(&card->controls_rwsem);
 430                 list_for_each(list, &card->ctl_files) {
 431                         kctl = snd_ctl_file(list);
 432                         if (kctl->pid == current->pid) {
 433                                 subdevice = kctl->prefer_rawmidi_subdevice;
 434                                 break;
 435                         }
 436                 }
 437                 up_read(&card->controls_rwsem);
 438                 err = snd_rawmidi_kernel_open(rmidi->card, rmidi->device,
 439                                               subdevice, fflags, rawmidi_file);
 440                 if (err >= 0)
 441                         break;
 442                 if (err == -EAGAIN) {
 443                         if (file->f_flags & O_NONBLOCK) {
 444                                 err = -EBUSY;
 445                                 break;
 446                         }
 447                 } else
 448                         break;
 449                 set_current_state(TASK_INTERRUPTIBLE);
 450                 mutex_unlock(&rmidi->open_mutex);
 451                 schedule();
 452                 mutex_lock(&rmidi->open_mutex);
 453                 if (signal_pending(current)) {
 454                         err = -ERESTARTSYS;
 455                         break;
 456                 }
 457         }
 458 #ifdef CONFIG_SND_OSSEMUL
 459         if (rawmidi_file->input && rawmidi_file->input->runtime)
 460                 rawmidi_file->input->runtime->oss = (maj == SOUND_MAJOR);
 461         if (rawmidi_file->output && rawmidi_file->output->runtime)
 462                 rawmidi_file->output->runtime->oss = (maj == SOUND_MAJOR);
 463 #endif
 464         remove_wait_queue(&rmidi->open_wait, &wait);
 465         if (err >= 0) {
 466                 file->private_data = rawmidi_file;
 467         } else {
 468                 snd_card_file_remove(card, file);
 469                 kfree(rawmidi_file);
 470         }
 471         mutex_unlock(&rmidi->open_mutex);
 472         return err;
 473 }
 474
 475 int snd_rawmidi_kernel_release(struct snd_rawmidi_file * rfile)
 476 {
 477         struct snd_rawmidi *rmidi;
 478         struct snd_rawmidi_substream *substream;
 479         struct snd_rawmidi_runtime *runtime;
 480
 481         snd_assert(rfile != NULL, return -ENXIO);
 482         snd_assert(rfile->input != NULL || rfile->output != NULL, return -ENXIO);
 483         rmidi = rfile->rmidi;
 484         mutex_lock(&rmidi->open_mutex);
 485         if (rfile->input != NULL) {
 486                 substream = rfile->input;
 487                 rfile->input = NULL;
 488                 runtime = substream->runtime;
 489                 snd_rawmidi_input_trigger(substream, 0);
 490                 substream->ops->close(substream);
 491                 if (runtime->private_free != NULL)
 492                         runtime->private_free(substream);
 493                 snd_rawmidi_runtime_free(substream);
 494                 substream->opened = 0;
 495                 rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substream_opened--;
 496         }
 497         if (rfile->output != NULL) {
 498                 substream = rfile->output;
 499                 rfile->output = NULL;
 500                 if (--substream->use_count == 0) {
 501                         runtime = substream->runtime;
 502                         if (substream->active_sensing) {
 503                                 unsigned char buf = 0xfe;
 504                                 /* sending single active sensing message to shut the device up */
 505                                 snd_rawmidi_kernel_write(substream, &buf, 1);
 506                         }
 507                         if (snd_rawmidi_drain_output(substream) == -ERESTARTSYS)
 508                                 snd_rawmidi_output_trigger(substream, 0);
 509                         substream->ops->close(substream);
 510                         if (runtime->private_free != NULL)
 511                                 runtime->private_free(substream);
 512                         snd_rawmidi_runtime_free(substream);
 513                         substream->opened = 0;
 514                         substream->append = 0;
 515                 }
 516                 rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substream_opened--;
 517         }
 518         mutex_unlock(&rmidi->open_mutex);
 519         module_put(rmidi->card->module);
 520         return 0;
 521 }
 522
 523 static int snd_rawmidi_release(struct inode *inode, struct file *file)
 524 {
 525         struct snd_rawmidi_file *rfile;
 526         struct snd_rawmidi *rmidi;
 527         int err;
 528
 529         rfile = file->private_data;
 530         err = snd_rawmidi_kernel_release(rfile);
 531         rmidi = rfile->rmidi;
 532         wake_up(&rmidi->open_wait);
 533         kfree(rfile);
 534         snd_card_file_remove(rmidi->card, file);
 535         return err;
 536 }
 537
 538 static int snd_rawmidi_info(struct snd_rawmidi_substream *substream,
 539                             struct snd_rawmidi_info *info)
 540 {
 541         struct snd_rawmidi *rmidi;
 542
 543         if (substream == NULL)
 544                 return -ENODEV;
 545         rmidi = substream->rmidi;
 546         memset(info, 0, sizeof(*info));
 547         info->card = rmidi->card->number;
 548         info->device = rmidi->device;
 549         info->subdevice = substream->number;
 550         info->stream = substream->stream;
 551         info->flags = rmidi->info_flags;
 552         strcpy(info->id, rmidi->id);
 553         strcpy(info->name, rmidi->name);
 554         strcpy(info->subname, substream->name);
 555         info->subdevices_count = substream->pstr->substream_count;
 556         info->subdevices_avail = (substream->pstr->substream_count -
 557                                   substream->pstr->substream_opened);
 558         return 0;
 559 }
 560
 561 static int snd_rawmidi_info_user(struct snd_rawmidi_substream *substream,
 562                                  struct snd_rawmidi_info __user * _info)
 563 {
 564         struct snd_rawmidi_info info;
 565         int err;
 566         if ((err = snd_rawmidi_info(substream, &info)) < 0)
 567                 return err;
 568         if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
 569                 return -EFAULT;
 570         return 0;
 571 }
 572
 573 int snd_rawmidi_info_select(struct snd_card *card, struct snd_rawmidi_info *info)
 574 {
 575         struct snd_rawmidi *rmidi;
 576         struct snd_rawmidi_str *pstr;
 577         struct snd_rawmidi_substream *substream;
 578         struct list_head *list;
 579
 580         mutex_lock(&register_mutex);
 581         rmidi = snd_rawmidi_search(card, info->device);
 582         mutex_unlock(&register_mutex);
 583         if (!rmidi)
 584                 return -ENXIO;
 585         if (info->stream < 0 || info->stream > 1)
 586                 return -EINVAL;
 587         pstr = &rmidi->streams[info->stream];
 588         if (pstr->substream_count == 0)
 589                 return -ENOENT;
 590         if (info->subdevice >= pstr->substream_count)
 591                 return -ENXIO;
 592         list_for_each(list, &pstr->substreams) {
 593                 substream = list_entry(list, struct snd_rawmidi_substream, list);
 594                 if ((unsigned int)substream->number == info->subdevice)
 595                         return snd_rawmidi_info(substream, info);
 596         }
 597         return -ENXIO;
 598 }
 599
 600 static int snd_rawmidi_info_select_user(struct snd_card *card,
 601                                         struct snd_rawmidi_info __user *_info)
 602 {
 603         int err;
 604         struct snd_rawmidi_info info;
 605         if (get_user(info.device, &_info->device))
 606                 return -EFAULT;
 607         if (get_user(info.stream, &_info->stream))
 608                 return -EFAULT;
 609         if (get_user(info.subdevice, &_info->subdevice))
 610                 return -EFAULT;
 611         if ((err = snd_rawmidi_info_select(card, &info)) < 0)
 612                 return err;
 613         if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
 614                 return -EFAULT;
 615         return 0;
 616 }
 617
 618 int snd_rawmidi_output_params(struct snd_rawmidi_substream *substream,
 619                               struct snd_rawmidi_params * params)
 620 {
 621         char *newbuf;
 622         struct snd_rawmidi_runtime *runtime = substream->runtime;
 623
 624         if (substream->append && substream->use_count > 1)
 625                 return -EBUSY;
 626         snd_rawmidi_drain_output(substream);
 627         if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L) {
 628                 return -EINVAL;
 629         }
 630         if (params->avail_min < 1 || params->avail_min > params->buffer_size) {
 631                 return -EINVAL;
 632         }
 633         if (params->buffer_size != runtime->buffer_size) {
 634                 newbuf = kmalloc(params->buffer_size, GFP_KERNEL);
 635                 if (!newbuf)
 636                         return -ENOMEM;
 637                 kfree(runtime->buffer);
 638                 runtime->buffer = newbuf;
 639                 runtime->buffer_size = params->buffer_size;
 640                 runtime->avail = runtime->buffer_size;
 641         }
 642         runtime->avail_min = params->avail_min;
 643         substream->active_sensing = !params->no_active_sensing;
 644         return 0;
 645 }
 646
 647 int snd_rawmidi_input_params(struct snd_rawmidi_substream *substream,
 648                              struct snd_rawmidi_params * params)
 649 {
 650         char *newbuf;
 651         struct snd_rawmidi_runtime *runtime = substream->runtime;
 652
 653         snd_rawmidi_drain_input(substream);
 654         if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L) {
 655                 return -EINVAL;
 656         }
 657         if (params->avail_min < 1 || params->avail_min > params->buffer_size) {
 658                 return -EINVAL;
 659         }
 660         if (params->buffer_size != runtime->buffer_size) {
 661                 newbuf = kmalloc(params->buffer_size, GFP_KERNEL);
 662                 if (!newbuf)
 663                         return -ENOMEM;
 664                 kfree(runtime->buffer);
 665                 runtime->buffer = newbuf;
 666                 runtime->buffer_size = params->buffer_size;
 667         }
 668         runtime->avail_min = params->avail_min;
 669         return 0;
 670 }
 671
 672 static int snd_rawmidi_output_status(struct snd_rawmidi_substream *substream,
 673                                      struct snd_rawmidi_status * status)
 674 {
 675         struct snd_rawmidi_runtime *runtime = substream->runtime;
 676
 677         memset(status, 0, sizeof(*status));
 678         status->stream = SNDRV_RAWMIDI_STREAM_OUTPUT;
 679         spin_lock_irq(&runtime->lock);
 680         status->avail = runtime->avail;
 681         spin_unlock_irq(&runtime->lock);
 682         return 0;
 683 }
 684
 685 static int snd_rawmidi_input_status(struct snd_rawmidi_substream *substream,
 686                                     struct snd_rawmidi_status * status)
 687 {
 688         struct snd_rawmidi_runtime *runtime = substream->runtime;
 689
 690         memset(status, 0, sizeof(*status));
 691         status->stream = SNDRV_RAWMIDI_STREAM_INPUT;
 692         spin_lock_irq(&runtime->lock);
 693         status->avail = runtime->avail;
 694         status->xruns = runtime->xruns;
 695         runtime->xruns = 0;
 696         spin_unlock_irq(&runtime->lock);
 697         return 0;
 698 }
 699
 700 static long snd_rawmidi_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 701 {
 702         struct snd_rawmidi_file *rfile;
 703         void __user *argp = (void __user *)arg;
 704
 705         rfile = file->private_data;
 706         if (((cmd >> 8) & 0xff) != 'W')
 707                 return -ENOTTY;
 708         switch (cmd) {
 709         case SNDRV_RAWMIDI_IOCTL_PVERSION:
 710                 return put_user(SNDRV_RAWMIDI_VERSION, (int __user *)argp) ? -EFAULT : 0;
 711         case SNDRV_RAWMIDI_IOCTL_INFO:
 712         {
 713                 int stream;
 714                 struct snd_rawmidi_info __user *info = argp;
 715                 if (get_user(stream, &info->stream))
 716                         return -EFAULT;
 717                 switch (stream) {
 718                 case SNDRV_RAWMIDI_STREAM_INPUT:
 719                         return snd_rawmidi_info_user(rfile->input, info);
 720                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
 721                         return snd_rawmidi_info_user(rfile->output, info);
 722                 default:
 723                         return -EINVAL;
 724                 }
 725         }
 726         case SNDRV_RAWMIDI_IOCTL_PARAMS:
 727         {
 728                 struct snd_rawmidi_params params;
 729                 if (copy_from_user(&params, argp, sizeof(struct snd_rawmidi_params)))
 730                         return -EFAULT;
 731                 switch (params.stream) {
 732                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
 733                         if (rfile->output == NULL)
 734                                 return -EINVAL;
 735                         return snd_rawmidi_output_params(rfile->output, &params);
 736                 case SNDRV_RAWMIDI_STREAM_INPUT:
 737                         if (rfile->input == NULL)
 738                                 return -EINVAL;
 739                         return snd_rawmidi_input_params(rfile->input, &params);
 740                 default:
 741                         return -EINVAL;
 742                 }
 743         }
 744         case SNDRV_RAWMIDI_IOCTL_STATUS:
 745         {
 746                 int err = 0;
 747                 struct snd_rawmidi_status status;
 748                 if (copy_from_user(&status, argp, sizeof(struct snd_rawmidi_status)))
 749                         return -EFAULT;
 750                 switch (status.stream) {
 751                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
 752                         if (rfile->output == NULL)
 753                                 return -EINVAL;
 754                         err = snd_rawmidi_output_status(rfile->output, &status);
 755                         break;
 756                 case SNDRV_RAWMIDI_STREAM_INPUT:
 757                         if (rfile->input == NULL)
 758                                 return -EINVAL;
 759                         err = snd_rawmidi_input_status(rfile->input, &status);
 760                         break;
 761                 default:
 762                         return -EINVAL;
 763                 }
 764                 if (err < 0)
 765                         return err;
 766                 if (copy_to_user(argp, &status, sizeof(struct snd_rawmidi_status)))
 767                         return -EFAULT;
 768                 return 0;
 769         }
 770         case SNDRV_RAWMIDI_IOCTL_DROP:
 771         {
 772                 int val;
 773                 if (get_user(val, (int __user *) argp))
 774                         return -EFAULT;
 775                 switch (val) {
 776                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
 777                         if (rfile->output == NULL)
 778                                 return -EINVAL;
 779                         return snd_rawmidi_drop_output(rfile->output);
 780                 default:
 781                         return -EINVAL;
 782                 }
 783         }
 784         case SNDRV_RAWMIDI_IOCTL_DRAIN:
 785         {
 786                 int val;
 787                 if (get_user(val, (int __user *) argp))
 788                         return -EFAULT;
 789                 switch (val) {
 790                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
 791                         if (rfile->output == NULL)
 792                                 return -EINVAL;
 793                         return snd_rawmidi_drain_output(rfile->output);
 794                 case SNDRV_RAWMIDI_STREAM_INPUT:
 795                         if (rfile->input == NULL)
 796                                 return -EINVAL;
 797                         return snd_rawmidi_drain_input(rfile->input);
 798                 default:
 799                         return -EINVAL;
 800                 }
 801         }
 802 #ifdef CONFIG_SND_DEBUG
 803         default:
 804                 snd_printk(KERN_WARNING "rawmidi: unknown command = 0x%x\n", cmd);
 805 #endif
 806         }
 807         return -ENOTTY;
 808 }
 809
 810 static int snd_rawmidi_control_ioctl(struct snd_card *card,
 811                                      struct snd_ctl_file *control,
 812                                      unsigned int cmd,
 813                                      unsigned long arg)
 814 {
 815         void __user *argp = (void __user *)arg;
 816
 817         switch (cmd) {
 818         case SNDRV_CTL_IOCTL_RAWMIDI_NEXT_DEVICE:
 819         {
 820                 int device;
 821
 822                 if (get_user(device, (int __user *)argp))
 823                         return -EFAULT;
 824                 mutex_lock(&register_mutex);
 825                 device = device < 0 ? 0 : device + 1;
 826                 while (device < SNDRV_RAWMIDI_DEVICES) {
 827                         if (snd_rawmidi_search(card, device))
 828                                 break;
 829                         device++;
 830                 }
 831                 if (device == SNDRV_RAWMIDI_DEVICES)
 832                         device = -1;
 833                 mutex_unlock(&register_mutex);
 834                 if (put_user(device, (int __user *)argp))
 835                         return -EFAULT;
 836                 return 0;
 837         }
 838         case SNDRV_CTL_IOCTL_RAWMIDI_PREFER_SUBDEVICE:
 839         {
 840                 int val;
 841
 842                 if (get_user(val, (int __user *)argp))
 843                         return -EFAULT;
 844                 control->prefer_rawmidi_subdevice = val;
 845                 return 0;
 846         }
 847         case SNDRV_CTL_IOCTL_RAWMIDI_INFO:
 848                 return snd_rawmidi_info_select_user(card, argp);
 849         }
 850         return -ENOIOCTLCMD;
 851 }
 852
 853 /**
 854  * snd_rawmidi_receive - receive the input data from the device
 855  * @substream: the rawmidi substream
 856  * @buffer: the buffer pointer
 857  * @count: the data size to read
 858  *
 859  * Reads the data from the internal buffer.
 860  *
 861  * Returns the size of read data, or a negative error code on failure.
 862  */
 863 int snd_rawmidi_receive(struct snd_rawmidi_substream *substream,
 864                         const unsigned char *buffer, int count)
 865 {
 866         unsigned long flags;
 867         int result = 0, count1;
 868         struct snd_rawmidi_runtime *runtime = substream->runtime;
 869
 870         if (runtime->buffer == NULL) {
 871                 snd_printd("snd_rawmidi_receive: input is not active!!!\n");
 872                 return -EINVAL;
 873         }
 874         spin_lock_irqsave(&runtime->lock, flags);
 875         if (count == 1) {       /* special case, faster code */
 876                 substream->bytes++;
 877                 if (runtime->avail < runtime->buffer_size) {
 878                         runtime->buffer[runtime->hw_ptr++] = buffer[0];
 879                         runtime->hw_ptr %= runtime->buffer_size;
 880                         runtime->avail++;
 881                         result++;
 882                 } else {
 883                         runtime->xruns++;
 884                 }
 885         } else {
 886                 substream->bytes += count;
 887                 count1 = runtime->buffer_size - runtime->hw_ptr;
 888                 if (count1 > count)
 889                         count1 = count;
 890                 if (count1 > (int)(runtime->buffer_size - runtime->avail))
 891                         count1 = runtime->buffer_size - runtime->avail;
 892                 memcpy(runtime->buffer + runtime->hw_ptr, buffer, count1);
 893                 runtime->hw_ptr += count1;
 894                 runtime->hw_ptr %= runtime->buffer_size;
 895                 runtime->avail += count1;
 896                 count -= count1;
 897                 result += count1;
 898                 if (count > 0) {
 899                         buffer += count1;
 900                         count1 = count;
 901                         if (count1 > (int)(runtime->buffer_size - runtime->avail)) {
 902                                 count1 = runtime->buffer_size - runtime->avail;
 903                                 runtime->xruns += count - count1;
 904                         }
 905                         if (count1 > 0) {
 906                                 memcpy(runtime->buffer, buffer, count1);
 907                                 runtime->hw_ptr = count1;
 908                                 runtime->avail += count1;
 909                                 result += count1;
 910                         }
 911                 }
 912         }
 913         if (result > 0) {
 914                 if (runtime->event)
 915                         tasklet_hi_schedule(&runtime->tasklet);
 916                 else if (snd_rawmidi_ready(substream))
 917                         wake_up(&runtime->sleep);
 918         }
 919         spin_unlock_irqrestore(&runtime->lock, flags);
 920         return result;
 921 }
 922
 923 static long snd_rawmidi_kernel_read1(struct snd_rawmidi_substream *substream,
 924                                      unsigned char *buf, long count, int kernel)
 925 {
 926         unsigned long flags;
 927         long result = 0, count1;
 928         struct snd_rawmidi_runtime *runtime = substream->runtime;
 929
 930         while (count > 0 && runtime->avail) {
 931                 count1 = runtime->buffer_size - runtime->appl_ptr;
 932                 if (count1 > count)
 933                         count1 = count;
 934                 spin_lock_irqsave(&runtime->lock, flags);
 935                 if (count1 > (int)runtime->avail)
 936                         count1 = runtime->avail;
 937                 if (kernel) {
 938                         memcpy(buf + result, runtime->buffer + runtime->appl_ptr, count1);
 939                 } else {
 940                         spin_unlock_irqrestore(&runtime->lock, flags);
 941                         if (copy_to_user((char __user *)buf + result,
 942                                          runtime->buffer + runtime->appl_ptr, count1)) {
 943                                 return result > 0 ? result : -EFAULT;
 944                         }
 945                         spin_lock_irqsave(&runtime->lock, flags);
 946                 }
 947                 runtime->appl_ptr += count1;
 948                 runtime->appl_ptr %= runtime->buffer_size;
 949                 runtime->avail -= count1;
 950                 spin_unlock_irqrestore(&runtime->lock, flags);
 951                 result += count1;
 952                 count -= count1;
 953         }
 954         return result;
 955 }
 956
 957 long snd_rawmidi_kernel_read(struct snd_rawmidi_substream *substream,
 958                              unsigned char *buf, long count)
 959 {
 960         snd_rawmidi_input_trigger(substream, 1);
 961         return snd_rawmidi_kernel_read1(substream, buf, count, 1);
 962 }
 963
 964 static ssize_t snd_rawmidi_read(struct file *file, char __user *buf, size_t count,
 965                                 loff_t *offset)
 966 {
 967         long result;
 968         int count1;
 969         struct snd_rawmidi_file *rfile;
 970         struct snd_rawmidi_substream *substream;
 971         struct snd_rawmidi_runtime *runtime;
 972
 973         rfile = file->private_data;
 974         substream = rfile->input;
 975         if (substream == NULL)
 976                 return -EIO;
 977         runtime = substream->runtime;
 978         snd_rawmidi_input_trigger(substream, 1);
 979         result = 0;
 980         while (count > 0) {
 981                 spin_lock_irq(&runtime->lock);
 982                 while (!snd_rawmidi_ready(substream)) {
 983                         wait_queue_t wait;
 984                         if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
 985                                 spin_unlock_irq(&runtime->lock);
 986                                 return result > 0 ? result : -EAGAIN;
 987                         }
 988                         init_waitqueue_entry(&wait, current);
 989                         add_wait_queue(&runtime->sleep, &wait);
 990                         set_current_state(TASK_INTERRUPTIBLE);
 991                         spin_unlock_irq(&runtime->lock);
 992                         schedule();
 993                         remove_wait_queue(&runtime->sleep, &wait);
 994                         if (signal_pending(current))
 995                                 return result > 0 ? result : -ERESTARTSYS;
 996                         if (!runtime->avail)
 997                                 return result > 0 ? result : -EIO;
 998                         spin_lock_irq(&runtime->lock);
 999                 }
1000                 spin_unlock_irq(&runtime->lock);
1001                 count1 = snd_rawmidi_kernel_read1(substream,
1002                                                   (unsigned char __force *)buf,
1003                                                   count, 0);
1004                 if (count1 < 0)
1005                         return result > 0 ? result : count1;
1006                 result += count1;
1007                 buf += count1;
1008                 count -= count1;
1009         }
1010         return result;
1011 }
1012
1013 /**
1014  * snd_rawmidi_transmit_empty - check whether the output buffer is empty
1015  * @substream: the rawmidi substream
1016  *
1017  * Returns 1 if the internal output buffer is empty, 0 if not.
1018  */
1019 int snd_rawmidi_transmit_empty(struct snd_rawmidi_substream *substream)
1020 {
1021         struct snd_rawmidi_runtime *runtime = substream->runtime;
1022         int result;
1023         unsigned long flags;
1024
1025         if (runtime->buffer == NULL) {
1026                 snd_printd("snd_rawmidi_transmit_empty: output is not active!!!\n");
1027                 return 1;
1028         }
1029         spin_lock_irqsave(&runtime->lock, flags);
1030         result = runtime->avail >= runtime->buffer_size;
1031         spin_unlock_irqrestore(&runtime->lock, flags);
1032         return result;
1033 }
1034
1035 /**
1036  * snd_rawmidi_transmit_peek - copy data from the internal buffer
1037  * @substream: the rawmidi substream
1038  * @buffer: the buffer pointer
1039  * @count: data size to transfer
1040  *
1041  * Copies data from the internal output buffer to the given buffer.
1042  *
1043  * Call this in the interrupt handler when the midi output is ready,
1044  * and call snd_rawmidi_transmit_ack() after the transmission is
1045  * finished.
1046  *
1047  * Returns the size of copied data, or a negative error code on failure.
1048  */
1049 int snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
1050                               unsigned char *buffer, int count)
1051 {
1052         unsigned long flags;
1053         int result, count1;
1054         struct snd_rawmidi_runtime *runtime = substream->runtime;
1055
1056         if (runtime->buffer == NULL) {
1057                 snd_printd("snd_rawmidi_transmit_peek: output is not active!!!\n");
1058                 return -EINVAL;
1059         }
1060         result = 0;
1061         spin_lock_irqsave(&runtime->lock, flags);
1062         if (runtime->avail >= runtime->buffer_size) {
1063                 /* warning: lowlevel layer MUST trigger down the hardware */
1064                 goto __skip;
1065         }
1066         if (count == 1) {       /* special case, faster code */
1067                 *buffer = runtime->buffer[runtime->hw_ptr];
1068                 result++;
1069         } else {
1070                 count1 = runtime->buffer_size - runtime->hw_ptr;
1071                 if (count1 > count)
1072                         count1 = count;
1073                 if (count1 > (int)(runtime->buffer_size - runtime->avail))
1074                         count1 = runtime->buffer_size - runtime->avail;
1075                 memcpy(buffer, runtime->buffer + runtime->hw_ptr, count1);
1076                 count -= count1;
1077                 result += count1;
1078                 if (count > 0) {
1079                         if (count > (int)(runtime->buffer_size - runtime->avail - count1))
1080                                 count = runtime->buffer_size - runtime->avail - count1;
1081                         memcpy(buffer + count1, runtime->buffer, count);
1082                         result += count;
1083                 }
1084         }
1085       __skip:
1086         spin_unlock_irqrestore(&runtime->lock, flags);
1087         return result;
1088 }
1089
1090 /**
1091  * snd_rawmidi_transmit_ack - acknowledge the transmission
1092  * @substream: the rawmidi substream
1093  * @count: the tranferred count
1094  *
1095  * Advances the hardware pointer for the internal output buffer with
1096  * the given size and updates the condition.
1097  * Call after the transmission is finished.
1098  *
1099  * Returns the advanced size if successful, or a negative error code on failure.
1100  */
1101 int snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count)
1102 {
1103         unsigned long flags;
1104         struct snd_rawmidi_runtime *runtime = substream->runtime;
1105
1106         if (runtime->buffer == NULL) {
1107                 snd_printd("snd_rawmidi_transmit_ack: output is not active!!!\n");
1108                 return -EINVAL;
1109         }
1110         spin_lock_irqsave(&runtime->lock, flags);
1111         snd_assert(runtime->avail + count <= runtime->buffer_size, );
1112         runtime->hw_ptr += count;
1113         runtime->hw_ptr %= runtime->buffer_size;
1114         runtime->avail += count;
1115         substream->bytes += count;
1116         if (count > 0) {
1117                 if (runtime->drain || snd_rawmidi_ready(substream))
1118                         wake_up(&runtime->sleep);
1119         }
1120         spin_unlock_irqrestore(&runtime->lock, flags);
1121         return count;
1122 }
1123
1124 /**
1125  * snd_rawmidi_transmit - copy from the buffer to the device
1126  * @substream: the rawmidi substream
1127  * @buffer: the buffer pointer
1128  * @count: the data size to transfer
1129  *
1130  * Copies data from the buffer to the device and advances the pointer.
1131  *
1132  * Returns the copied size if successful, or a negative error code on failure.
1133  */
1134 int snd_rawmidi_transmit(struct snd_rawmidi_substream *substream,
1135                          unsigned char *buffer, int count)
1136 {
1137         count = snd_rawmidi_transmit_peek(substream, buffer, count);
1138         if (count < 0)
1139                 return count;
1140         return snd_rawmidi_transmit_ack(substream, count);
1141 }
1142
1143 static long snd_rawmidi_kernel_write1(struct snd_rawmidi_substream *substream,
1144                                       const unsigned char *buf, long count, int kernel)
1145 {
1146         unsigned long flags;
1147         long count1, result;
1148         struct snd_rawmidi_runtime *runtime = substream->runtime;
1149
1150         snd_assert(buf != NULL, return -EINVAL);
1151         snd_assert(runtime->buffer != NULL, return -EINVAL);
1152
1153         result = 0;
1154         spin_lock_irqsave(&runtime->lock, flags);
1155         if (substream->append) {
1156                 if ((long)runtime->avail < count) {
1157                         spin_unlock_irqrestore(&runtime->lock, flags);
1158                         return -EAGAIN;
1159                 }
1160         }
1161         while (count > 0 && runtime->avail > 0) {
1162                 count1 = runtime->buffer_size - runtime->appl_ptr;
1163                 if (count1 > count)
1164                         count1 = count;
1165                 if (count1 > (long)runtime->avail)
1166                         count1 = runtime->avail;
1167                 if (kernel) {
1168                         memcpy(runtime->buffer + runtime->appl_ptr, buf, count1);
1169                 } else {
1170                         spin_unlock_irqrestore(&runtime->lock, flags);
1171                         if (copy_from_user(runtime->buffer + runtime->appl_ptr,
1172                                            (char __user *)buf, count1)) {
1173                                 spin_lock_irqsave(&runtime->lock, flags);
1174                                 result = result > 0 ? result : -EFAULT;
1175                                 goto __end;
1176                         }
1177                         spin_lock_irqsave(&runtime->lock, flags);
1178                 }
1179                 runtime->appl_ptr += count1;
1180                 runtime->appl_ptr %= runtime->buffer_size;
1181                 runtime->avail -= count1;
1182                 result += count1;
1183                 buf += count1;
1184                 count -= count1;
1185         }
1186       __end:
1187         count1 = runtime->avail < runtime->buffer_size;
1188         spin_unlock_irqrestore(&runtime->lock, flags);
1189         if (count1)
1190                 snd_rawmidi_output_trigger(substream, 1);
1191         return result;
1192 }
1193
1194 long snd_rawmidi_kernel_write(struct snd_rawmidi_substream *substream,
1195                               const unsigned char *buf, long count)
1196 {
1197         return snd_rawmidi_kernel_write1(substream, buf, count, 1);
1198 }
1199
1200 static ssize_t snd_rawmidi_write(struct file *file, const char __user *buf,
1201                                  size_t count, loff_t *offset)
1202 {
1203         long result, timeout;
1204         int count1;
1205         struct snd_rawmidi_file *rfile;
1206         struct snd_rawmidi_runtime *runtime;
1207         struct snd_rawmidi_substream *substream;
1208
1209         rfile = file->private_data;
1210         substream = rfile->output;
1211         runtime = substream->runtime;
1212         /* we cannot put an atomic message to our buffer */
1213         if (substream->append && count > runtime->buffer_size)
1214                 return -EIO;
1215         result = 0;
1216         while (count > 0) {
1217                 spin_lock_irq(&runtime->lock);
1218                 while (!snd_rawmidi_ready_append(substream, count)) {
1219                         wait_queue_t wait;
1220                         if (file->f_flags & O_NONBLOCK) {
1221                                 spin_unlock_irq(&runtime->lock);
1222                                 return result > 0 ? result : -EAGAIN;
1223                         }
1224                         init_waitqueue_entry(&wait, current);
1225                         add_wait_queue(&runtime->sleep, &wait);
1226                         set_current_state(TASK_INTERRUPTIBLE);
1227                         spin_unlock_irq(&runtime->lock);
1228                         timeout = schedule_timeout(30 * HZ);
1229                         remove_wait_queue(&runtime->sleep, &wait);
1230                         if (signal_pending(current))
1231                                 return result > 0 ? result : -ERESTARTSYS;
1232                         if (!runtime->avail && !timeout)
1233                                 return result > 0 ? result : -EIO;
1234                         spin_lock_irq(&runtime->lock);
1235                 }
1236                 spin_unlock_irq(&runtime->lock);
1237                 count1 = snd_rawmidi_kernel_write1(substream,
1238                                                    (unsigned char __force *)buf,
1239                                                    count, 0);
1240                 if (count1 < 0)
1241                         return result > 0 ? result : count1;
1242                 result += count1;
1243                 buf += count1;
1244                 if ((size_t)count1 < count && (file->f_flags & O_NONBLOCK))
1245                         break;
1246                 count -= count1;
1247         }
1248         if (file->f_flags & O_SYNC) {
1249                 spin_lock_irq(&runtime->lock);
1250                 while (runtime->avail != runtime->buffer_size) {
1251                         wait_queue_t wait;
1252                         unsigned int last_avail = runtime->avail;
1253                         init_waitqueue_entry(&wait, current);
1254                         add_wait_queue(&runtime->sleep, &wait);
1255                         set_current_state(TASK_INTERRUPTIBLE);
1256                         spin_unlock_irq(&runtime->lock);
1257                         timeout = schedule_timeout(30 * HZ);
1258                         remove_wait_queue(&runtime->sleep, &wait);
1259                         if (signal_pending(current))
1260                                 return result > 0 ? result : -ERESTARTSYS;
1261                         if (runtime->avail == last_avail && !timeout)
1262                                 return result > 0 ? result : -EIO;
1263                         spin_lock_irq(&runtime->lock);
1264                 }
1265                 spin_unlock_irq(&runtime->lock);
1266         }
1267         return result;
1268 }
1269
1270 static unsigned int snd_rawmidi_poll(struct file *file, poll_table * wait)
1271 {
1272         struct snd_rawmidi_file *rfile;
1273         struct snd_rawmidi_runtime *runtime;
1274         unsigned int mask;
1275
1276         rfile = file->private_data;
1277         if (rfile->input != NULL) {
1278                 runtime = rfile->input->runtime;
1279                 snd_rawmidi_input_trigger(rfile->input, 1);
1280                 poll_wait(file, &runtime->sleep, wait);
1281         }
1282         if (rfile->output != NULL) {
1283                 runtime = rfile->output->runtime;
1284                 poll_wait(file, &runtime->sleep, wait);
1285         }
1286         mask = 0;
1287         if (rfile->input != NULL) {
1288                 if (snd_rawmidi_ready(rfile->input))
1289                         mask |= POLLIN | POLLRDNORM;
1290         }
1291         if (rfile->output != NULL) {
1292                 if (snd_rawmidi_ready(rfile->output))
1293                         mask |= POLLOUT | POLLWRNORM;
1294         }
1295         return mask;
1296 }
1297
1298 /*
1299  */
1300 #ifdef CONFIG_COMPAT
1301 #include "rawmidi_compat.c"
1302 #else
1303 #define snd_rawmidi_ioctl_compat        NULL
1304 #endif
1305
1306 /*
1307
1308  */
1309
1310 static void snd_rawmidi_proc_info_read(struct snd_info_entry *entry,
1311                                        struct snd_info_buffer *buffer)
1312 {
1313         struct snd_rawmidi *rmidi;
1314         struct snd_rawmidi_substream *substream;
1315         struct snd_rawmidi_runtime *runtime;
1316         struct list_head *list;
1317
1318         rmidi = entry->private_data;
1319         snd_iprintf(buffer, "%s\n\n", rmidi->name);
1320         mutex_lock(&rmidi->open_mutex);
1321         if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_OUTPUT) {
1322                 list_for_each(list, &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams) {
1323                         substream = list_entry(list, struct snd_rawmidi_substream, list);
1324                         snd_iprintf(buffer,
1325                                     "Output %d\n"
1326                                     "  Tx bytes     : %lu\n",
1327                                     substream->number,
1328                                     (unsigned long) substream->bytes);
1329                         if (substream->opened) {
1330                                 runtime = substream->runtime;
1331                                 snd_iprintf(buffer,
1332                                     "  Mode         : %s\n"
1333                                     "  Buffer size  : %lu\n"
1334                                     "  Avail        : %lu\n",
1335                                     runtime->oss ? "OSS compatible" : "native",
1336                                     (unsigned long) runtime->buffer_size,
1337                                     (unsigned long) runtime->avail);
1338                         }
1339                 }
1340         }
1341         if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_INPUT) {
1342                 list_for_each(list, &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams) {
1343                         substream = list_entry(list, struct snd_rawmidi_substream, list);
1344                         snd_iprintf(buffer,
1345                                     "Input %d\n"
1346                                     "  Rx bytes     : %lu\n",
1347                                     substream->number,
1348                                     (unsigned long) substream->bytes);
1349                         if (substream->opened) {
1350                                 runtime = substream->runtime;
1351                                 snd_iprintf(buffer,
1352                                             "  Buffer size  : %lu\n"
1353                                             "  Avail        : %lu\n"
1354                                             "  Overruns     : %lu\n",
1355                                             (unsigned long) runtime->buffer_size,
1356                                             (unsigned long) runtime->avail,
1357                                             (unsigned long) runtime->xruns);
1358                         }
1359                 }
1360         }
1361         mutex_unlock(&rmidi->open_mutex);
1362 }
1363
1364 /*
1365  *  Register functions
1366  */
1367
1368 static struct file_operations snd_rawmidi_f_ops =
1369 {
1370         .owner =        THIS_MODULE,
1371         .read =         snd_rawmidi_read,
1372         .write =        snd_rawmidi_write,
1373         .open =         snd_rawmidi_open,
1374         .release =      snd_rawmidi_release,
1375         .poll =         snd_rawmidi_poll,
1376         .unlocked_ioctl =       snd_rawmidi_ioctl,
1377         .compat_ioctl = snd_rawmidi_ioctl_compat,
1378 };
1379
1380 static int snd_rawmidi_alloc_substreams(struct snd_rawmidi *rmidi,
1381                                         struct snd_rawmidi_str *stream,
1382                                         int direction,
1383                                         int count)
1384 {
1385         struct snd_rawmidi_substream *substream;
1386         int idx;
1387
1388         INIT_LIST_HEAD(&stream->substreams);
1389         for (idx = 0; idx < count; idx++) {
1390                 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
1391                 if (substream == NULL) {
1392                         snd_printk(KERN_ERR "rawmidi: cannot allocate substream\n");
1393                         return -ENOMEM;
1394                 }
1395                 substream->stream = direction;
1396                 substream->number = idx;
1397                 substream->rmidi = rmidi;
1398                 substream->pstr = stream;
1399                 list_add_tail(&substream->list, &stream->substreams);
1400                 stream->substream_count++;
1401         }
1402         return 0;
1403 }
1404
1405 /**
1406  * snd_rawmidi_new - create a rawmidi instance
1407  * @card: the card instance
1408  * @id: the id string
1409  * @device: the device index
1410  * @output_count: the number of output streams
1411  * @input_count: the number of input streams
1412  * @rrawmidi: the pointer to store the new rawmidi instance
1413  *
1414  * Creates a new rawmidi instance.
1415  * Use snd_rawmidi_set_ops() to set the operators to the new instance.
1416  *
1417  * Returns zero if successful, or a negative error code on failure.
1418  */
1419 int snd_rawmidi_new(struct snd_card *card, char *id, int device,
1420                     int output_count, int input_count,
1421                     struct snd_rawmidi ** rrawmidi)
1422 {
1423         struct snd_rawmidi *rmidi;
1424         int err;
1425         static struct snd_device_ops ops = {
1426                 .dev_free = snd_rawmidi_dev_free,
1427                 .dev_register = snd_rawmidi_dev_register,
1428                 .dev_disconnect = snd_rawmidi_dev_disconnect,
1429                 .dev_unregister = snd_rawmidi_dev_unregister
1430         };
1431
1432         snd_assert(rrawmidi != NULL, return -EINVAL);
1433         *rrawmidi = NULL;
1434         snd_assert(card != NULL, return -ENXIO);
1435         rmidi = kzalloc(sizeof(*rmidi), GFP_KERNEL);
1436         if (rmidi == NULL) {
1437                 snd_printk(KERN_ERR "rawmidi: cannot allocate\n");
1438                 return -ENOMEM;
1439         }
1440         rmidi->card = card;
1441         rmidi->device = device;
1442         mutex_init(&rmidi->open_mutex);
1443         init_waitqueue_head(&rmidi->open_wait);
1444         if (id != NULL)
1445                 strlcpy(rmidi->id, id, sizeof(rmidi->id));
1446         if ((err = snd_rawmidi_alloc_substreams(rmidi,
1447                                                 &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT],
1448                                                 SNDRV_RAWMIDI_STREAM_INPUT,
1449                                                 input_count)) < 0) {
1450                 snd_rawmidi_free(rmidi);
1451                 return err;
1452         }
1453         if ((err = snd_rawmidi_alloc_substreams(rmidi,
1454                                                 &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT],
1455                                                 SNDRV_RAWMIDI_STREAM_OUTPUT,
1456                                                 output_count)) < 0) {
1457                 snd_rawmidi_free(rmidi);
1458                 return err;
1459         }
1460         if ((err = snd_device_new(card, SNDRV_DEV_RAWMIDI, rmidi, &ops)) < 0) {
1461                 snd_rawmidi_free(rmidi);
1462                 return err;
1463         }
1464         *rrawmidi = rmidi;
1465         return 0;
1466 }
1467
1468 static void snd_rawmidi_free_substreams(struct snd_rawmidi_str *stream)
1469 {
1470         struct snd_rawmidi_substream *substream;
1471
1472         while (!list_empty(&stream->substreams)) {
1473                 substream = list_entry(stream->substreams.next, struct snd_rawmidi_substream, list);
1474                 list_del(&substream->list);
1475                 kfree(substream);
1476         }
1477 }
1478
1479 static int snd_rawmidi_free(struct snd_rawmidi *rmidi)
1480 {
1481         snd_assert(rmidi != NULL, return -ENXIO);
1482         snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT]);
1483         snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT]);
1484         if (rmidi->private_free)
1485                 rmidi->private_free(rmidi);
1486         kfree(rmidi);
1487         return 0;
1488 }
1489
1490 static int snd_rawmidi_dev_free(struct snd_device *device)
1491 {
1492         struct snd_rawmidi *rmidi = device->device_data;
1493         return snd_rawmidi_free(rmidi);
1494 }
1495
1496 #if defined(CONFIG_SND_SEQUENCER) || (defined(MODULE) && defined(CONFIG_SND_SEQUENCER_MODULE))
1497 static void snd_rawmidi_dev_seq_free(struct snd_seq_device *device)
1498 {
1499         struct snd_rawmidi *rmidi = device->private_data;
1500         rmidi->seq_dev = NULL;
1501 }
1502 #endif
1503
1504 static int snd_rawmidi_dev_register(struct snd_device *device)
1505 {
1506         int err;
1507         struct snd_info_entry *entry;
1508         char name[16];
1509         struct snd_rawmidi *rmidi = device->device_data;
1510
1511         if (rmidi->device >= SNDRV_RAWMIDI_DEVICES)
1512                 return -ENOMEM;
1513         mutex_lock(&register_mutex);
1514         if (snd_rawmidi_search(rmidi->card, rmidi->device)) {
1515                 mutex_unlock(&register_mutex);
1516                 return -EBUSY;
1517         }
1518         list_add_tail(&rmidi->list, &snd_rawmidi_devices);
1519         sprintf(name, "midiC%iD%i", rmidi->card->number, rmidi->device);
1520         if ((err = snd_register_device(SNDRV_DEVICE_TYPE_RAWMIDI,
1521                                        rmidi->card, rmidi->device,
1522                                        &snd_rawmidi_f_ops, rmidi, name)) < 0) {
1523                 snd_printk(KERN_ERR "unable to register rawmidi device %i:%i\n", rmidi->card->number, rmidi->device);
1524                 list_del(&rmidi->list);
1525                 mutex_unlock(&register_mutex);
1526                 return err;
1527         }
1528         if (rmidi->ops && rmidi->ops->dev_register &&
1529             (err = rmidi->ops->dev_register(rmidi)) < 0) {
1530                 snd_unregister_device(SNDRV_DEVICE_TYPE_RAWMIDI, rmidi->card, rmidi->device);
1531                 list_del(&rmidi->list);
1532                 mutex_unlock(&register_mutex);
1533                 return err;
1534         }
1535 #ifdef CONFIG_SND_OSSEMUL
1536         rmidi->ossreg = 0;
1537         if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1538                 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1539                                             rmidi->card, 0, &snd_rawmidi_f_ops,
1540                                             rmidi, name) < 0) {
1541                         snd_printk(KERN_ERR "unable to register OSS rawmidi device %i:%i\n", rmidi->card->number, 0);
1542                 } else {
1543                         rmidi->ossreg++;
1544 #ifdef SNDRV_OSS_INFO_DEV_MIDI
1545                         snd_oss_info_register(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number, rmidi->name);
1546 #endif
1547                 }
1548         }
1549         if ((int)rmidi->device == amidi_map[rmidi->card->number]) {
1550                 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1551                                             rmidi->card, 1, &snd_rawmidi_f_ops,
1552                                             rmidi, name) < 0) {
1553                         snd_printk(KERN_ERR "unable to register OSS rawmidi device %i:%i\n", rmidi->card->number, 1);
1554                 } else {
1555                         rmidi->ossreg++;
1556                 }
1557         }
1558 #endif /* CONFIG_SND_OSSEMUL */
1559         mutex_unlock(&register_mutex);
1560         sprintf(name, "midi%d", rmidi->device);
1561         entry = snd_info_create_card_entry(rmidi->card, name, rmidi->card->proc_root);
1562         if (entry) {
1563                 entry->private_data = rmidi;
1564                 entry->c.text.read = snd_rawmidi_proc_info_read;
1565                 if (snd_info_register(entry) < 0) {
1566                         snd_info_free_entry(entry);
1567                         entry = NULL;
1568                 }
1569         }
1570         rmidi->proc_entry = entry;
1571 #if defined(CONFIG_SND_SEQUENCER) || (defined(MODULE) && defined(CONFIG_SND_SEQUENCER_MODULE))
1572         if (!rmidi->ops || !rmidi->ops->dev_register) { /* own registration mechanism */
1573                 if (snd_seq_device_new(rmidi->card, rmidi->device, SNDRV_SEQ_DEV_ID_MIDISYNTH, 0, &rmidi->seq_dev) >= 0) {
1574                         rmidi->seq_dev->private_data = rmidi;
1575                         rmidi->seq_dev->private_free = snd_rawmidi_dev_seq_free;
1576                         sprintf(rmidi->seq_dev->name, "MIDI %d-%d", rmidi->card->number, rmidi->device);
1577                         snd_device_register(rmidi->card, rmidi->seq_dev);
1578                 }
1579         }
1580 #endif
1581         return 0;
1582 }
1583
1584 static int snd_rawmidi_dev_disconnect(struct snd_device *device)
1585 {
1586         struct snd_rawmidi *rmidi = device->device_data;
1587
1588         mutex_lock(&register_mutex);
1589         list_del_init(&rmidi->list);
1590         mutex_unlock(&register_mutex);
1591         return 0;
1592 }
1593
1594 static int snd_rawmidi_dev_unregister(struct snd_device *device)
1595 {
1596         struct snd_rawmidi *rmidi = device->device_data;
1597
1598         snd_assert(rmidi != NULL, return -ENXIO);
1599         mutex_lock(&register_mutex);
1600         list_del(&rmidi->list);
1601         if (rmidi->proc_entry) {
1602                 snd_info_unregister(rmidi->proc_entry);
1603                 rmidi->proc_entry = NULL;
1604         }
1605 #ifdef CONFIG_SND_OSSEMUL
1606         if (rmidi->ossreg) {
1607                 if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1608                         snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 0);
1609 #ifdef SNDRV_OSS_INFO_DEV_MIDI
1610                         snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number);
1611 #endif
1612                 }
1613                 if ((int)rmidi->device == amidi_map[rmidi->card->number])
1614                         snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 1);
1615                 rmidi->ossreg = 0;
1616         }
1617 #endif /* CONFIG_SND_OSSEMUL */
1618         if (rmidi->ops && rmidi->ops->dev_unregister)
1619                 rmidi->ops->dev_unregister(rmidi);
1620         snd_unregister_device(SNDRV_DEVICE_TYPE_RAWMIDI, rmidi->card, rmidi->device);
1621         mutex_unlock(&register_mutex);
1622 #if defined(CONFIG_SND_SEQUENCER) || (defined(MODULE) && defined(CONFIG_SND_SEQUENCER_MODULE))
1623         if (rmidi->seq_dev) {
1624                 snd_device_free(rmidi->card, rmidi->seq_dev);
1625                 rmidi->seq_dev = NULL;
1626         }
1627 #endif
1628         return snd_rawmidi_free(rmidi);
1629 }
1630
1631 /**
1632  * snd_rawmidi_set_ops - set the rawmidi operators
1633  * @rmidi: the rawmidi instance
1634  * @stream: the stream direction, SNDRV_RAWMIDI_STREAM_XXX
1635  * @ops: the operator table
1636  *
1637  * Sets the rawmidi operators for the given stream direction.
1638  */
1639 void snd_rawmidi_set_ops(struct snd_rawmidi *rmidi, int stream,
1640                          struct snd_rawmidi_ops *ops)
1641 {
1642         struct list_head *list;
1643         struct snd_rawmidi_substream *substream;
1644
1645         list_for_each(list, &rmidi->streams[stream].substreams) {
1646                 substream = list_entry(list, struct snd_rawmidi_substream, list);
1647                 substream->ops = ops;
1648         }
1649 }
1650
1651 /*
1652  *  ENTRY functions
1653  */
1654
1655 static int __init alsa_rawmidi_init(void)
1656 {
1657
1658         snd_ctl_register_ioctl(snd_rawmidi_control_ioctl);
1659         snd_ctl_register_ioctl_compat(snd_rawmidi_control_ioctl);
1660 #ifdef CONFIG_SND_OSSEMUL
1661         { int i;
1662         /* check device map table */
1663         for (i = 0; i < SNDRV_CARDS; i++) {
1664                 if (midi_map[i] < 0 || midi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1665                         snd_printk(KERN_ERR "invalid midi_map[%d] = %d\n", i, midi_map[i]);
1666                         midi_map[i] = 0;
1667                 }
1668                 if (amidi_map[i] < 0 || amidi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1669                         snd_printk(KERN_ERR "invalid amidi_map[%d] = %d\n", i, amidi_map[i]);
1670                         amidi_map[i] = 1;
1671                 }
1672         }
1673         }
1674 #endif /* CONFIG_SND_OSSEMUL */
1675         return 0;
1676 }
1677
1678 static void __exit alsa_rawmidi_exit(void)
1679 {
1680         snd_ctl_unregister_ioctl(snd_rawmidi_control_ioctl);
1681         snd_ctl_unregister_ioctl_compat(snd_rawmidi_control_ioctl);
1682 }
1683
1684 module_init(alsa_rawmidi_init)
1685 module_exit(alsa_rawmidi_exit)
1686
1687 EXPORT_SYMBOL(snd_rawmidi_output_params);
1688 EXPORT_SYMBOL(snd_rawmidi_input_params);
1689 EXPORT_SYMBOL(snd_rawmidi_drop_output);
1690 EXPORT_SYMBOL(snd_rawmidi_drain_output);
1691 EXPORT_SYMBOL(snd_rawmidi_drain_input);
1692 EXPORT_SYMBOL(snd_rawmidi_receive);
1693 EXPORT_SYMBOL(snd_rawmidi_transmit_empty);
1694 EXPORT_SYMBOL(snd_rawmidi_transmit_peek);
1695 EXPORT_SYMBOL(snd_rawmidi_transmit_ack);
1696 EXPORT_SYMBOL(snd_rawmidi_transmit);
1697 EXPORT_SYMBOL(snd_rawmidi_new);
1698 EXPORT_SYMBOL(snd_rawmidi_set_ops);
1699 EXPORT_SYMBOL(snd_rawmidi_info_select);
1700 EXPORT_SYMBOL(snd_rawmidi_kernel_open);
1701 EXPORT_SYMBOL(snd_rawmidi_kernel_release);
1702 EXPORT_SYMBOL(snd_rawmidi_kernel_read);
1703 EXPORT_SYMBOL(snd_rawmidi_kernel_write);