sound/core/rawmidi.c

   1 /*
   2  *  Abstract layer for MIDI v1.0 stream
   3  *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
   4  *
   5  *
   6  *   This program is free software; you can redistribute it and/or modify
   7  *   it under the terms of the GNU General Public License as published by
   8  *   the Free Software Foundation; either version 2 of the License, or
   9  *   (at your option) any later version.
  10  *
  11  *   This program is distributed in the hope that it will be useful,
  12  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *   GNU General Public License for more details.
  15  *
  16  *   You should have received a copy of the GNU General Public License
  17  *   along with this program; if not, write to the Free Software
  18  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  19  *
  20  */
  21
  22 #include <sound/core.h>
  23 #include <linux/major.h>
  24 #include <linux/init.h>
  25 #include <linux/sched.h>
  26 #include <linux/slab.h>
  27 #include <linux/time.h>
  28 #include <linux/wait.h>
  29 #include <linux/mutex.h>
  30 #include <linux/moduleparam.h>
  31 #include <linux/delay.h>
  32 #include <sound/rawmidi.h>
  33 #include <sound/info.h>
  34 #include <sound/control.h>
  35 #include <sound/minors.h>
  36 #include <sound/initval.h>
  37
  38 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
  39 MODULE_DESCRIPTION("Midlevel RawMidi code for ALSA.");
  40 MODULE_LICENSE("GPL");
  41
  42 #ifdef CONFIG_SND_OSSEMUL
  43 static int midi_map[SNDRV_CARDS];
  44 static int amidi_map[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS-1)] = 1};
  45 module_param_array(midi_map, int, NULL, 0444);
  46 MODULE_PARM_DESC(midi_map, "Raw MIDI device number assigned to 1st OSS device.");
  47 module_param_array(amidi_map, int, NULL, 0444);
  48 MODULE_PARM_DESC(amidi_map, "Raw MIDI device number assigned to 2nd OSS device.");
  49 #endif /* CONFIG_SND_OSSEMUL */
  50
  51 static int snd_rawmidi_free(struct snd_rawmidi *rawmidi);
  52 static int snd_rawmidi_dev_free(struct snd_device *device);
  53 static int snd_rawmidi_dev_register(struct snd_device *device);
  54 static int snd_rawmidi_dev_disconnect(struct snd_device *device);
  55
  56 static LIST_HEAD(snd_rawmidi_devices);
  57 static DEFINE_MUTEX(register_mutex);
  58
  59 static struct snd_rawmidi *snd_rawmidi_search(struct snd_card *card, int device)
  60 {
  61         struct snd_rawmidi *rawmidi;
  62
  63         list_for_each_entry(rawmidi, &snd_rawmidi_devices, list)
  64                 if (rawmidi->card == card && rawmidi->device == device)
  65                         return rawmidi;
  66         return NULL;
  67 }
  68
  69 static inline unsigned short snd_rawmidi_file_flags(struct file *file)
  70 {
  71         switch (file->f_mode & (FMODE_READ | FMODE_WRITE)) {
  72         case FMODE_WRITE:
  73                 return SNDRV_RAWMIDI_LFLG_OUTPUT;
  74         case FMODE_READ:
  75                 return SNDRV_RAWMIDI_LFLG_INPUT;
  76         default:
  77                 return SNDRV_RAWMIDI_LFLG_OPEN;
  78         }
  79 }
  80
  81 static inline int snd_rawmidi_ready(struct snd_rawmidi_substream *substream)
  82 {
  83         struct snd_rawmidi_runtime *runtime = substream->runtime;
  84         return runtime->avail >= runtime->avail_min;
  85 }
  86
  87 static inline int snd_rawmidi_ready_append(struct snd_rawmidi_substream *substream,
  88                                            size_t count)
  89 {
  90         struct snd_rawmidi_runtime *runtime = substream->runtime;
  91         return runtime->avail >= runtime->avail_min &&
  92                (!substream->append || runtime->avail >= count);
  93 }
  94
  95 static void snd_rawmidi_input_event_tasklet(unsigned long data)
  96 {
  97         struct snd_rawmidi_substream *substream = (struct snd_rawmidi_substream *)data;
  98         substream->runtime->event(substream);
  99 }
 100
 101 static void snd_rawmidi_output_trigger_tasklet(unsigned long data)
 102 {
 103         struct snd_rawmidi_substream *substream = (struct snd_rawmidi_substream *)data;
 104         substream->ops->trigger(substream, 1);
 105 }
 106
 107 static int snd_rawmidi_runtime_create(struct snd_rawmidi_substream *substream)
 108 {
 109         struct snd_rawmidi_runtime *runtime;
 110
 111         if ((runtime = kzalloc(sizeof(*runtime), GFP_KERNEL)) == NULL)
 112                 return -ENOMEM;
 113         spin_lock_init(&runtime->lock);
 114         init_waitqueue_head(&runtime->sleep);
 115         if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
 116                 tasklet_init(&runtime->tasklet,
 117                              snd_rawmidi_input_event_tasklet,
 118                              (unsigned long)substream);
 119         else
 120                 tasklet_init(&runtime->tasklet,
 121                              snd_rawmidi_output_trigger_tasklet,
 122                              (unsigned long)substream);
 123         runtime->event = NULL;
 124         runtime->buffer_size = PAGE_SIZE;
 125         runtime->avail_min = 1;
 126         if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
 127                 runtime->avail = 0;
 128         else
 129                 runtime->avail = runtime->buffer_size;
 130         if ((runtime->buffer = kmalloc(runtime->buffer_size, GFP_KERNEL)) == NULL) {
 131                 kfree(runtime);
 132                 return -ENOMEM;
 133         }
 134         runtime->appl_ptr = runtime->hw_ptr = 0;
 135         substream->runtime = runtime;
 136         return 0;
 137 }
 138
 139 static int snd_rawmidi_runtime_free(struct snd_rawmidi_substream *substream)
 140 {
 141         struct snd_rawmidi_runtime *runtime = substream->runtime;
 142
 143         kfree(runtime->buffer);
 144         kfree(runtime);
 145         substream->runtime = NULL;
 146         return 0;
 147 }
 148
 149 static inline void snd_rawmidi_output_trigger(struct snd_rawmidi_substream *substream,int up)
 150 {
 151         if (up) {
 152                 tasklet_hi_schedule(&substream->runtime->tasklet);
 153         } else {
 154                 tasklet_kill(&substream->runtime->tasklet);
 155                 substream->ops->trigger(substream, 0);
 156         }
 157 }
 158
 159 static void snd_rawmidi_input_trigger(struct snd_rawmidi_substream *substream, int up)
 160 {
 161         substream->ops->trigger(substream, up);
 162         if (!up && substream->runtime->event)
 163                 tasklet_kill(&substream->runtime->tasklet);
 164 }
 165
 166 int snd_rawmidi_drop_output(struct snd_rawmidi_substream *substream)
 167 {
 168         unsigned long flags;
 169         struct snd_rawmidi_runtime *runtime = substream->runtime;
 170
 171         snd_rawmidi_output_trigger(substream, 0);
 172         runtime->drain = 0;
 173         spin_lock_irqsave(&runtime->lock, flags);
 174         runtime->appl_ptr = runtime->hw_ptr = 0;
 175         runtime->avail = runtime->buffer_size;
 176         spin_unlock_irqrestore(&runtime->lock, flags);
 177         return 0;
 178 }
 179
 180 int snd_rawmidi_drain_output(struct snd_rawmidi_substream *substream)
 181 {
 182         int err;
 183         long timeout;
 184         struct snd_rawmidi_runtime *runtime = substream->runtime;
 185
 186         err = 0;
 187         runtime->drain = 1;
 188         timeout = wait_event_interruptible_timeout(runtime->sleep,
 189                                 (runtime->avail >= runtime->buffer_size),
 190                                 10*HZ);
 191         if (signal_pending(current))
 192                 err = -ERESTARTSYS;
 193         if (runtime->avail < runtime->buffer_size && !timeout) {
 194                 snd_printk(KERN_WARNING "rawmidi drain error (avail = %li, buffer_size = %li)\n", (long)runtime->avail, (long)runtime->buffer_size);
 195                 err = -EIO;
 196         }
 197         runtime->drain = 0;
 198         if (err != -ERESTARTSYS) {
 199                 /* we need wait a while to make sure that Tx FIFOs are empty */
 200                 if (substream->ops->drain)
 201                         substream->ops->drain(substream);
 202                 else
 203                         msleep(50);
 204                 snd_rawmidi_drop_output(substream);
 205         }
 206         return err;
 207 }
 208
 209 int snd_rawmidi_drain_input(struct snd_rawmidi_substream *substream)
 210 {
 211         unsigned long flags;
 212         struct snd_rawmidi_runtime *runtime = substream->runtime;
 213
 214         snd_rawmidi_input_trigger(substream, 0);
 215         runtime->drain = 0;
 216         spin_lock_irqsave(&runtime->lock, flags);
 217         runtime->appl_ptr = runtime->hw_ptr = 0;
 218         runtime->avail = 0;
 219         spin_unlock_irqrestore(&runtime->lock, flags);
 220         return 0;
 221 }
 222
 223 int snd_rawmidi_kernel_open(struct snd_card *card, int device, int subdevice,
 224                             int mode, struct snd_rawmidi_file * rfile)
 225 {
 226         struct snd_rawmidi *rmidi;
 227         struct list_head *list1, *list2;
 228         struct snd_rawmidi_substream *sinput = NULL, *soutput = NULL;
 229         struct snd_rawmidi_runtime *input = NULL, *output = NULL;
 230         int err;
 231
 232         if (rfile)
 233                 rfile->input = rfile->output = NULL;
 234         mutex_lock(&register_mutex);
 235         rmidi = snd_rawmidi_search(card, device);
 236         mutex_unlock(&register_mutex);
 237         if (rmidi == NULL) {
 238                 err = -ENODEV;
 239                 goto __error1;
 240         }
 241         if (!try_module_get(rmidi->card->module)) {
 242                 err = -EFAULT;
 243                 goto __error1;
 244         }
 245         if (!(mode & SNDRV_RAWMIDI_LFLG_NOOPENLOCK))
 246                 mutex_lock(&rmidi->open_mutex);
 247         if (mode & SNDRV_RAWMIDI_LFLG_INPUT) {
 248                 if (!(rmidi->info_flags & SNDRV_RAWMIDI_INFO_INPUT)) {
 249                         err = -ENXIO;
 250                         goto __error;
 251                 }
 252                 if (subdevice >= 0 && (unsigned int)subdevice >= rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substream_count) {
 253                         err = -ENODEV;
 254                         goto __error;
 255                 }
 256                 if (rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substream_opened >=
 257                     rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substream_count) {
 258                         err = -EAGAIN;
 259                         goto __error;
 260                 }
 261         }
 262         if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) {
 263                 if (!(rmidi->info_flags & SNDRV_RAWMIDI_INFO_OUTPUT)) {
 264                         err = -ENXIO;
 265                         goto __error;
 266                 }
 267                 if (subdevice >= 0 && (unsigned int)subdevice >= rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substream_count) {
 268                         err = -ENODEV;
 269                         goto __error;
 270                 }
 271                 if (rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substream_opened >=
 272                     rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substream_count) {
 273                         err = -EAGAIN;
 274                         goto __error;
 275                 }
 276         }
 277         list1 = rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams.next;
 278         while (1) {
 279                 if (list1 == &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams) {
 280                         sinput = NULL;
 281                         if (mode & SNDRV_RAWMIDI_LFLG_INPUT) {
 282                                 err = -EAGAIN;
 283                                 goto __error;
 284                         }
 285                         break;
 286                 }
 287                 sinput = list_entry(list1, struct snd_rawmidi_substream, list);
 288                 if ((mode & SNDRV_RAWMIDI_LFLG_INPUT) && sinput->opened)
 289                         goto __nexti;
 290                 if (subdevice < 0 || (subdevice >= 0 && subdevice == sinput->number))
 291                         break;
 292               __nexti:
 293                 list1 = list1->next;
 294         }
 295         list2 = rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams.next;
 296         while (1) {
 297                 if (list2 == &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams) {
 298                         soutput = NULL;
 299                         if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) {
 300                                 err = -EAGAIN;
 301                                 goto __error;
 302                         }
 303                         break;
 304                 }
 305                 soutput = list_entry(list2, struct snd_rawmidi_substream, list);
 306                 if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) {
 307                         if (mode & SNDRV_RAWMIDI_LFLG_APPEND) {
 308                                 if (soutput->opened && !soutput->append)
 309                                         goto __nexto;
 310                         } else {
 311                                 if (soutput->opened)
 312                                         goto __nexto;
 313                         }
 314                 }
 315                 if (subdevice < 0 || (subdevice >= 0 && subdevice == soutput->number))
 316                         break;
 317               __nexto:
 318                 list2 = list2->next;
 319         }
 320         if (mode & SNDRV_RAWMIDI_LFLG_INPUT) {
 321                 if ((err = snd_rawmidi_runtime_create(sinput)) < 0)
 322                         goto __error;
 323                 input = sinput->runtime;
 324                 if ((err = sinput->ops->open(sinput)) < 0)
 325                         goto __error;
 326                 sinput->opened = 1;
 327                 rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substream_opened++;
 328         } else {
 329                 sinput = NULL;
 330         }
 331         if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) {
 332                 if (soutput->opened)
 333                         goto __skip_output;
 334                 if ((err = snd_rawmidi_runtime_create(soutput)) < 0) {
 335                         if (mode & SNDRV_RAWMIDI_LFLG_INPUT)
 336                                 sinput->ops->close(sinput);
 337                         goto __error;
 338                 }
 339                 output = soutput->runtime;
 340                 if ((err = soutput->ops->open(soutput)) < 0) {
 341                         if (mode & SNDRV_RAWMIDI_LFLG_INPUT)
 342                                 sinput->ops->close(sinput);
 343                         goto __error;
 344                 }
 345               __skip_output:
 346                 soutput->opened = 1;
 347                 if (mode & SNDRV_RAWMIDI_LFLG_APPEND)
 348                         soutput->append = 1;
 349                 if (soutput->use_count++ == 0)
 350                         soutput->active_sensing = 1;
 351                 rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substream_opened++;
 352         } else {
 353                 soutput = NULL;
 354         }
 355         if (!(mode & SNDRV_RAWMIDI_LFLG_NOOPENLOCK))
 356                 mutex_unlock(&rmidi->open_mutex);
 357         if (rfile) {
 358                 rfile->rmidi = rmidi;
 359                 rfile->input = sinput;
 360                 rfile->output = soutput;
 361         }
 362         return 0;
 363
 364       __error:
 365         if (input != NULL)
 366                 snd_rawmidi_runtime_free(sinput);
 367         if (output != NULL)
 368                 snd_rawmidi_runtime_free(soutput);
 369         module_put(rmidi->card->module);
 370         if (!(mode & SNDRV_RAWMIDI_LFLG_NOOPENLOCK))
 371                 mutex_unlock(&rmidi->open_mutex);
 372       __error1:
 373         return err;
 374 }
 375
 376 static int snd_rawmidi_open(struct inode *inode, struct file *file)
 377 {
 378         int maj = imajor(inode);
 379         struct snd_card *card;
 380         int subdevice;
 381         unsigned short fflags;
 382         int err;
 383         struct snd_rawmidi *rmidi;
 384         struct snd_rawmidi_file *rawmidi_file;
 385         wait_queue_t wait;
 386         struct snd_ctl_file *kctl;
 387
 388         if (maj == snd_major) {
 389                 rmidi = snd_lookup_minor_data(iminor(inode),
 390                                               SNDRV_DEVICE_TYPE_RAWMIDI);
 391 #ifdef CONFIG_SND_OSSEMUL
 392         } else if (maj == SOUND_MAJOR) {
 393                 rmidi = snd_lookup_oss_minor_data(iminor(inode),
 394                                                   SNDRV_OSS_DEVICE_TYPE_MIDI);
 395 #endif
 396         } else
 397                 return -ENXIO;
 398
 399         if (rmidi == NULL)
 400                 return -ENODEV;
 401         if ((file->f_flags & O_APPEND) && !(file->f_flags & O_NONBLOCK))
 402                 return -EINVAL;         /* invalid combination */
 403         card = rmidi->card;
 404         err = snd_card_file_add(card, file);
 405         if (err < 0)
 406                 return -ENODEV;
 407         fflags = snd_rawmidi_file_flags(file);
 408         if ((file->f_flags & O_APPEND) || maj == SOUND_MAJOR) /* OSS emul? */
 409                 fflags |= SNDRV_RAWMIDI_LFLG_APPEND;
 410         fflags |= SNDRV_RAWMIDI_LFLG_NOOPENLOCK;
 411         rawmidi_file = kmalloc(sizeof(*rawmidi_file), GFP_KERNEL);
 412         if (rawmidi_file == NULL) {
 413                 snd_card_file_remove(card, file);
 414                 return -ENOMEM;
 415         }
 416         init_waitqueue_entry(&wait, current);
 417         add_wait_queue(&rmidi->open_wait, &wait);
 418         mutex_lock(&rmidi->open_mutex);
 419         while (1) {
 420                 subdevice = -1;
 421                 read_lock(&card->ctl_files_rwlock);
 422                 list_for_each_entry(kctl, &card->ctl_files, list) {
 423                         if (kctl->pid == current->pid) {
 424                                 subdevice = kctl->prefer_rawmidi_subdevice;
 425                                 if (subdevice != -1)
 426                                         break;
 427                         }
 428                 }
 429                 read_unlock(&card->ctl_files_rwlock);
 430                 err = snd_rawmidi_kernel_open(rmidi->card, rmidi->device,
 431                                               subdevice, fflags, rawmidi_file);
 432                 if (err >= 0)
 433                         break;
 434                 if (err == -EAGAIN) {
 435                         if (file->f_flags & O_NONBLOCK) {
 436                                 err = -EBUSY;
 437                                 break;
 438                         }
 439                 } else
 440                         break;
 441                 set_current_state(TASK_INTERRUPTIBLE);
 442                 mutex_unlock(&rmidi->open_mutex);
 443                 schedule();
 444                 mutex_lock(&rmidi->open_mutex);
 445                 if (signal_pending(current)) {
 446                         err = -ERESTARTSYS;
 447                         break;
 448                 }
 449         }
 450 #ifdef CONFIG_SND_OSSEMUL
 451         if (rawmidi_file->input && rawmidi_file->input->runtime)
 452                 rawmidi_file->input->runtime->oss = (maj == SOUND_MAJOR);
 453         if (rawmidi_file->output && rawmidi_file->output->runtime)
 454                 rawmidi_file->output->runtime->oss = (maj == SOUND_MAJOR);
 455 #endif
 456         remove_wait_queue(&rmidi->open_wait, &wait);
 457         if (err >= 0) {
 458                 file->private_data = rawmidi_file;
 459         } else {
 460                 snd_card_file_remove(card, file);
 461                 kfree(rawmidi_file);
 462         }
 463         mutex_unlock(&rmidi->open_mutex);
 464         return err;
 465 }
 466
 467 int snd_rawmidi_kernel_release(struct snd_rawmidi_file * rfile)
 468 {
 469         struct snd_rawmidi *rmidi;
 470         struct snd_rawmidi_substream *substream;
 471         struct snd_rawmidi_runtime *runtime;
 472
 473         snd_assert(rfile != NULL, return -ENXIO);
 474         snd_assert(rfile->input != NULL || rfile->output != NULL, return -ENXIO);
 475         rmidi = rfile->rmidi;
 476         mutex_lock(&rmidi->open_mutex);
 477         if (rfile->input != NULL) {
 478                 substream = rfile->input;
 479                 rfile->input = NULL;
 480                 runtime = substream->runtime;
 481                 snd_rawmidi_input_trigger(substream, 0);
 482                 substream->ops->close(substream);
 483                 if (runtime->private_free != NULL)
 484                         runtime->private_free(substream);
 485                 snd_rawmidi_runtime_free(substream);
 486                 substream->opened = 0;
 487                 rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substream_opened--;
 488         }
 489         if (rfile->output != NULL) {
 490                 substream = rfile->output;
 491                 rfile->output = NULL;
 492                 if (--substream->use_count == 0) {
 493                         runtime = substream->runtime;
 494                         if (substream->active_sensing) {
 495                                 unsigned char buf = 0xfe;
 496                                 /* sending single active sensing message to shut the device up */
 497                                 snd_rawmidi_kernel_write(substream, &buf, 1);
 498                         }
 499                         if (snd_rawmidi_drain_output(substream) == -ERESTARTSYS)
 500                                 snd_rawmidi_output_trigger(substream, 0);
 501                         substream->ops->close(substream);
 502                         if (runtime->private_free != NULL)
 503                                 runtime->private_free(substream);
 504                         snd_rawmidi_runtime_free(substream);
 505                         substream->opened = 0;
 506                         substream->append = 0;
 507                 }
 508                 rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substream_opened--;
 509         }
 510         mutex_unlock(&rmidi->open_mutex);
 511         module_put(rmidi->card->module);
 512         return 0;
 513 }
 514
 515 static int snd_rawmidi_release(struct inode *inode, struct file *file)
 516 {
 517         struct snd_rawmidi_file *rfile;
 518         struct snd_rawmidi *rmidi;
 519         int err;
 520
 521         rfile = file->private_data;
 522         err = snd_rawmidi_kernel_release(rfile);
 523         rmidi = rfile->rmidi;
 524         wake_up(&rmidi->open_wait);
 525         kfree(rfile);
 526         snd_card_file_remove(rmidi->card, file);
 527         return err;
 528 }
 529
 530 static int snd_rawmidi_info(struct snd_rawmidi_substream *substream,
 531                             struct snd_rawmidi_info *info)
 532 {
 533         struct snd_rawmidi *rmidi;
 534
 535         if (substream == NULL)
 536                 return -ENODEV;
 537         rmidi = substream->rmidi;
 538         memset(info, 0, sizeof(*info));
 539         info->card = rmidi->card->number;
 540         info->device = rmidi->device;
 541         info->subdevice = substream->number;
 542         info->stream = substream->stream;
 543         info->flags = rmidi->info_flags;
 544         strcpy(info->id, rmidi->id);
 545         strcpy(info->name, rmidi->name);
 546         strcpy(info->subname, substream->name);
 547         info->subdevices_count = substream->pstr->substream_count;
 548         info->subdevices_avail = (substream->pstr->substream_count -
 549                                   substream->pstr->substream_opened);
 550         return 0;
 551 }
 552
 553 static int snd_rawmidi_info_user(struct snd_rawmidi_substream *substream,
 554                                  struct snd_rawmidi_info __user * _info)
 555 {
 556         struct snd_rawmidi_info info;
 557         int err;
 558         if ((err = snd_rawmidi_info(substream, &info)) < 0)
 559                 return err;
 560         if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
 561                 return -EFAULT;
 562         return 0;
 563 }
 564
 565 int snd_rawmidi_info_select(struct snd_card *card, struct snd_rawmidi_info *info)
 566 {
 567         struct snd_rawmidi *rmidi;
 568         struct snd_rawmidi_str *pstr;
 569         struct snd_rawmidi_substream *substream;
 570
 571         mutex_lock(&register_mutex);
 572         rmidi = snd_rawmidi_search(card, info->device);
 573         mutex_unlock(&register_mutex);
 574         if (!rmidi)
 575                 return -ENXIO;
 576         if (info->stream < 0 || info->stream > 1)
 577                 return -EINVAL;
 578         pstr = &rmidi->streams[info->stream];
 579         if (pstr->substream_count == 0)
 580                 return -ENOENT;
 581         if (info->subdevice >= pstr->substream_count)
 582                 return -ENXIO;
 583         list_for_each_entry(substream, &pstr->substreams, list) {
 584                 if ((unsigned int)substream->number == info->subdevice)
 585                         return snd_rawmidi_info(substream, info);
 586         }
 587         return -ENXIO;
 588 }
 589
 590 static int snd_rawmidi_info_select_user(struct snd_card *card,
 591                                         struct snd_rawmidi_info __user *_info)
 592 {
 593         int err;
 594         struct snd_rawmidi_info info;
 595         if (get_user(info.device, &_info->device))
 596                 return -EFAULT;
 597         if (get_user(info.stream, &_info->stream))
 598                 return -EFAULT;
 599         if (get_user(info.subdevice, &_info->subdevice))
 600                 return -EFAULT;
 601         if ((err = snd_rawmidi_info_select(card, &info)) < 0)
 602                 return err;
 603         if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
 604                 return -EFAULT;
 605         return 0;
 606 }
 607
 608 int snd_rawmidi_output_params(struct snd_rawmidi_substream *substream,
 609                               struct snd_rawmidi_params * params)
 610 {
 611         char *newbuf;
 612         struct snd_rawmidi_runtime *runtime = substream->runtime;
 613
 614         if (substream->append && substream->use_count > 1)
 615                 return -EBUSY;
 616         snd_rawmidi_drain_output(substream);
 617         if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L) {
 618                 return -EINVAL;
 619         }
 620         if (params->avail_min < 1 || params->avail_min > params->buffer_size) {
 621                 return -EINVAL;
 622         }
 623         if (params->buffer_size != runtime->buffer_size) {
 624                 newbuf = kmalloc(params->buffer_size, GFP_KERNEL);
 625                 if (!newbuf)
 626                         return -ENOMEM;
 627                 kfree(runtime->buffer);
 628                 runtime->buffer = newbuf;
 629                 runtime->buffer_size = params->buffer_size;
 630                 runtime->avail = runtime->buffer_size;
 631         }
 632         runtime->avail_min = params->avail_min;
 633         substream->active_sensing = !params->no_active_sensing;
 634         return 0;
 635 }
 636
 637 int snd_rawmidi_input_params(struct snd_rawmidi_substream *substream,
 638                              struct snd_rawmidi_params * params)
 639 {
 640         char *newbuf;
 641         struct snd_rawmidi_runtime *runtime = substream->runtime;
 642
 643         snd_rawmidi_drain_input(substream);
 644         if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L) {
 645                 return -EINVAL;
 646         }
 647         if (params->avail_min < 1 || params->avail_min > params->buffer_size) {
 648                 return -EINVAL;
 649         }
 650         if (params->buffer_size != runtime->buffer_size) {
 651                 newbuf = kmalloc(params->buffer_size, GFP_KERNEL);
 652                 if (!newbuf)
 653                         return -ENOMEM;
 654                 kfree(runtime->buffer);
 655                 runtime->buffer = newbuf;
 656                 runtime->buffer_size = params->buffer_size;
 657         }
 658         runtime->avail_min = params->avail_min;
 659         return 0;
 660 }
 661
 662 static int snd_rawmidi_output_status(struct snd_rawmidi_substream *substream,
 663                                      struct snd_rawmidi_status * status)
 664 {
 665         struct snd_rawmidi_runtime *runtime = substream->runtime;
 666
 667         memset(status, 0, sizeof(*status));
 668         status->stream = SNDRV_RAWMIDI_STREAM_OUTPUT;
 669         spin_lock_irq(&runtime->lock);
 670         status->avail = runtime->avail;
 671         spin_unlock_irq(&runtime->lock);
 672         return 0;
 673 }
 674
 675 static int snd_rawmidi_input_status(struct snd_rawmidi_substream *substream,
 676                                     struct snd_rawmidi_status * status)
 677 {
 678         struct snd_rawmidi_runtime *runtime = substream->runtime;
 679
 680         memset(status, 0, sizeof(*status));
 681         status->stream = SNDRV_RAWMIDI_STREAM_INPUT;
 682         spin_lock_irq(&runtime->lock);
 683         status->avail = runtime->avail;
 684         status->xruns = runtime->xruns;
 685         runtime->xruns = 0;
 686         spin_unlock_irq(&runtime->lock);
 687         return 0;
 688 }
 689
 690 static long snd_rawmidi_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 691 {
 692         struct snd_rawmidi_file *rfile;
 693         void __user *argp = (void __user *)arg;
 694
 695         rfile = file->private_data;
 696         if (((cmd >> 8) & 0xff) != 'W')
 697                 return -ENOTTY;
 698         switch (cmd) {
 699         case SNDRV_RAWMIDI_IOCTL_PVERSION:
 700                 return put_user(SNDRV_RAWMIDI_VERSION, (int __user *)argp) ? -EFAULT : 0;
 701         case SNDRV_RAWMIDI_IOCTL_INFO:
 702         {
 703                 int stream;
 704                 struct snd_rawmidi_info __user *info = argp;
 705                 if (get_user(stream, &info->stream))
 706                         return -EFAULT;
 707                 switch (stream) {
 708                 case SNDRV_RAWMIDI_STREAM_INPUT:
 709                         return snd_rawmidi_info_user(rfile->input, info);
 710                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
 711                         return snd_rawmidi_info_user(rfile->output, info);
 712                 default:
 713                         return -EINVAL;
 714                 }
 715         }
 716         case SNDRV_RAWMIDI_IOCTL_PARAMS:
 717         {
 718                 struct snd_rawmidi_params params;
 719                 if (copy_from_user(&params, argp, sizeof(struct snd_rawmidi_params)))
 720                         return -EFAULT;
 721                 switch (params.stream) {
 722                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
 723                         if (rfile->output == NULL)
 724                                 return -EINVAL;
 725                         return snd_rawmidi_output_params(rfile->output, &params);
 726                 case SNDRV_RAWMIDI_STREAM_INPUT:
 727                         if (rfile->input == NULL)
 728                                 return -EINVAL;
 729                         return snd_rawmidi_input_params(rfile->input, &params);
 730                 default:
 731                         return -EINVAL;
 732                 }
 733         }
 734         case SNDRV_RAWMIDI_IOCTL_STATUS:
 735         {
 736                 int err = 0;
 737                 struct snd_rawmidi_status status;
 738                 if (copy_from_user(&status, argp, sizeof(struct snd_rawmidi_status)))
 739                         return -EFAULT;
 740                 switch (status.stream) {
 741                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
 742                         if (rfile->output == NULL)
 743                                 return -EINVAL;
 744                         err = snd_rawmidi_output_status(rfile->output, &status);
 745                         break;
 746                 case SNDRV_RAWMIDI_STREAM_INPUT:
 747                         if (rfile->input == NULL)
 748                                 return -EINVAL;
 749                         err = snd_rawmidi_input_status(rfile->input, &status);
 750                         break;
 751                 default:
 752                         return -EINVAL;
 753                 }
 754                 if (err < 0)
 755                         return err;
 756                 if (copy_to_user(argp, &status, sizeof(struct snd_rawmidi_status)))
 757                         return -EFAULT;
 758                 return 0;
 759         }
 760         case SNDRV_RAWMIDI_IOCTL_DROP:
 761         {
 762                 int val;
 763                 if (get_user(val, (int __user *) argp))
 764                         return -EFAULT;
 765                 switch (val) {
 766                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
 767                         if (rfile->output == NULL)
 768                                 return -EINVAL;
 769                         return snd_rawmidi_drop_output(rfile->output);
 770                 default:
 771                         return -EINVAL;
 772                 }
 773         }
 774         case SNDRV_RAWMIDI_IOCTL_DRAIN:
 775         {
 776                 int val;
 777                 if (get_user(val, (int __user *) argp))
 778                         return -EFAULT;
 779                 switch (val) {
 780                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
 781                         if (rfile->output == NULL)
 782                                 return -EINVAL;
 783                         return snd_rawmidi_drain_output(rfile->output);
 784                 case SNDRV_RAWMIDI_STREAM_INPUT:
 785                         if (rfile->input == NULL)
 786                                 return -EINVAL;
 787                         return snd_rawmidi_drain_input(rfile->input);
 788                 default:
 789                         return -EINVAL;
 790                 }
 791         }
 792 #ifdef CONFIG_SND_DEBUG
 793         default:
 794                 snd_printk(KERN_WARNING "rawmidi: unknown command = 0x%x\n", cmd);
 795 #endif
 796         }
 797         return -ENOTTY;
 798 }
 799
 800 static int snd_rawmidi_control_ioctl(struct snd_card *card,
 801                                      struct snd_ctl_file *control,
 802                                      unsigned int cmd,
 803                                      unsigned long arg)
 804 {
 805         void __user *argp = (void __user *)arg;
 806
 807         switch (cmd) {
 808         case SNDRV_CTL_IOCTL_RAWMIDI_NEXT_DEVICE:
 809         {
 810                 int device;
 811
 812                 if (get_user(device, (int __user *)argp))
 813                         return -EFAULT;
 814                 mutex_lock(&register_mutex);
 815                 device = device < 0 ? 0 : device + 1;
 816                 while (device < SNDRV_RAWMIDI_DEVICES) {
 817                         if (snd_rawmidi_search(card, device))
 818                                 break;
 819                         device++;
 820                 }
 821                 if (device == SNDRV_RAWMIDI_DEVICES)
 822                         device = -1;
 823                 mutex_unlock(&register_mutex);
 824                 if (put_user(device, (int __user *)argp))
 825                         return -EFAULT;
 826                 return 0;
 827         }
 828         case SNDRV_CTL_IOCTL_RAWMIDI_PREFER_SUBDEVICE:
 829         {
 830                 int val;
 831
 832                 if (get_user(val, (int __user *)argp))
 833                         return -EFAULT;
 834                 control->prefer_rawmidi_subdevice = val;
 835                 return 0;
 836         }
 837         case SNDRV_CTL_IOCTL_RAWMIDI_INFO:
 838                 return snd_rawmidi_info_select_user(card, argp);
 839         }
 840         return -ENOIOCTLCMD;
 841 }
 842
 843 /**
 844  * snd_rawmidi_receive - receive the input data from the device
 845  * @substream: the rawmidi substream
 846  * @buffer: the buffer pointer
 847  * @count: the data size to read
 848  *
 849  * Reads the data from the internal buffer.
 850  *
 851  * Returns the size of read data, or a negative error code on failure.
 852  */
 853 int snd_rawmidi_receive(struct snd_rawmidi_substream *substream,
 854                         const unsigned char *buffer, int count)
 855 {
 856         unsigned long flags;
 857         int result = 0, count1;
 858         struct snd_rawmidi_runtime *runtime = substream->runtime;
 859
 860         if (runtime->buffer == NULL) {
 861                 snd_printd("snd_rawmidi_receive: input is not active!!!\n");
 862                 return -EINVAL;
 863         }
 864         spin_lock_irqsave(&runtime->lock, flags);
 865         if (count == 1) {       /* special case, faster code */
 866                 substream->bytes++;
 867                 if (runtime->avail < runtime->buffer_size) {
 868                         runtime->buffer[runtime->hw_ptr++] = buffer[0];
 869                         runtime->hw_ptr %= runtime->buffer_size;
 870                         runtime->avail++;
 871                         result++;
 872                 } else {
 873                         runtime->xruns++;
 874                 }
 875         } else {
 876                 substream->bytes += count;
 877                 count1 = runtime->buffer_size - runtime->hw_ptr;
 878                 if (count1 > count)
 879                         count1 = count;
 880                 if (count1 > (int)(runtime->buffer_size - runtime->avail))
 881                         count1 = runtime->buffer_size - runtime->avail;
 882                 memcpy(runtime->buffer + runtime->hw_ptr, buffer, count1);
 883                 runtime->hw_ptr += count1;
 884                 runtime->hw_ptr %= runtime->buffer_size;
 885                 runtime->avail += count1;
 886                 count -= count1;
 887                 result += count1;
 888                 if (count > 0) {
 889                         buffer += count1;
 890                         count1 = count;
 891                         if (count1 > (int)(runtime->buffer_size - runtime->avail)) {
 892                                 count1 = runtime->buffer_size - runtime->avail;
 893                                 runtime->xruns += count - count1;
 894                         }
 895                         if (count1 > 0) {
 896                                 memcpy(runtime->buffer, buffer, count1);
 897                                 runtime->hw_ptr = count1;
 898                                 runtime->avail += count1;
 899                                 result += count1;
 900                         }
 901                 }
 902         }
 903         if (result > 0) {
 904                 if (runtime->event)
 905                         tasklet_hi_schedule(&runtime->tasklet);
 906                 else if (snd_rawmidi_ready(substream))
 907                         wake_up(&runtime->sleep);
 908         }
 909         spin_unlock_irqrestore(&runtime->lock, flags);
 910         return result;
 911 }
 912
 913 static long snd_rawmidi_kernel_read1(struct snd_rawmidi_substream *substream,
 914                                      unsigned char __user *userbuf,
 915                                      unsigned char *kernelbuf, long count)
 916 {
 917         unsigned long flags;
 918         long result = 0, count1;
 919         struct snd_rawmidi_runtime *runtime = substream->runtime;
 920
 921         while (count > 0 && runtime->avail) {
 922                 count1 = runtime->buffer_size - runtime->appl_ptr;
 923                 if (count1 > count)
 924                         count1 = count;
 925                 spin_lock_irqsave(&runtime->lock, flags);
 926                 if (count1 > (int)runtime->avail)
 927                         count1 = runtime->avail;
 928                 if (kernelbuf)
 929                         memcpy(kernelbuf + result, runtime->buffer + runtime->appl_ptr, count1);
 930                 if (userbuf) {
 931                         spin_unlock_irqrestore(&runtime->lock, flags);
 932                         if (copy_to_user(userbuf + result,
 933                                          runtime->buffer + runtime->appl_ptr, count1)) {
 934                                 return result > 0 ? result : -EFAULT;
 935                         }
 936                         spin_lock_irqsave(&runtime->lock, flags);
 937                 }
 938                 runtime->appl_ptr += count1;
 939                 runtime->appl_ptr %= runtime->buffer_size;
 940                 runtime->avail -= count1;
 941                 spin_unlock_irqrestore(&runtime->lock, flags);
 942                 result += count1;
 943                 count -= count1;
 944         }
 945         return result;
 946 }
 947
 948 long snd_rawmidi_kernel_read(struct snd_rawmidi_substream *substream,
 949                              unsigned char *buf, long count)
 950 {
 951         snd_rawmidi_input_trigger(substream, 1);
 952         return snd_rawmidi_kernel_read1(substream, NULL/*userbuf*/, buf, count);
 953 }
 954
 955 static ssize_t snd_rawmidi_read(struct file *file, char __user *buf, size_t count,
 956                                 loff_t *offset)
 957 {
 958         long result;
 959         int count1;
 960         struct snd_rawmidi_file *rfile;
 961         struct snd_rawmidi_substream *substream;
 962         struct snd_rawmidi_runtime *runtime;
 963
 964         rfile = file->private_data;
 965         substream = rfile->input;
 966         if (substream == NULL)
 967                 return -EIO;
 968         runtime = substream->runtime;
 969         snd_rawmidi_input_trigger(substream, 1);
 970         result = 0;
 971         while (count > 0) {
 972                 spin_lock_irq(&runtime->lock);
 973                 while (!snd_rawmidi_ready(substream)) {
 974                         wait_queue_t wait;
 975                         if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
 976                                 spin_unlock_irq(&runtime->lock);
 977                                 return result > 0 ? result : -EAGAIN;
 978                         }
 979                         init_waitqueue_entry(&wait, current);
 980                         add_wait_queue(&runtime->sleep, &wait);
 981                         set_current_state(TASK_INTERRUPTIBLE);
 982                         spin_unlock_irq(&runtime->lock);
 983                         schedule();
 984                         remove_wait_queue(&runtime->sleep, &wait);
 985                         if (signal_pending(current))
 986                                 return result > 0 ? result : -ERESTARTSYS;
 987                         if (!runtime->avail)
 988                                 return result > 0 ? result : -EIO;
 989                         spin_lock_irq(&runtime->lock);
 990                 }
 991                 spin_unlock_irq(&runtime->lock);
 992                 count1 = snd_rawmidi_kernel_read1(substream,
 993                                                   (unsigned char __user *)buf,
 994                                                   NULL/*kernelbuf*/,
 995                                                   count);
 996                 if (count1 < 0)
 997                         return result > 0 ? result : count1;
 998                 result += count1;
 999                 buf += count1;
1000                 count -= count1;
1001         }
1002         return result;
1003 }
1004
1005 /**
1006  * snd_rawmidi_transmit_empty - check whether the output buffer is empty
1007  * @substream: the rawmidi substream
1008  *
1009  * Returns 1 if the internal output buffer is empty, 0 if not.
1010  */
1011 int snd_rawmidi_transmit_empty(struct snd_rawmidi_substream *substream)
1012 {
1013         struct snd_rawmidi_runtime *runtime = substream->runtime;
1014         int result;
1015         unsigned long flags;
1016
1017         if (runtime->buffer == NULL) {
1018                 snd_printd("snd_rawmidi_transmit_empty: output is not active!!!\n");
1019                 return 1;
1020         }
1021         spin_lock_irqsave(&runtime->lock, flags);
1022         result = runtime->avail >= runtime->buffer_size;
1023         spin_unlock_irqrestore(&runtime->lock, flags);
1024         return result;
1025 }
1026
1027 /**
1028  * snd_rawmidi_transmit_peek - copy data from the internal buffer
1029  * @substream: the rawmidi substream
1030  * @buffer: the buffer pointer
1031  * @count: data size to transfer
1032  *
1033  * Copies data from the internal output buffer to the given buffer.
1034  *
1035  * Call this in the interrupt handler when the midi output is ready,
1036  * and call snd_rawmidi_transmit_ack() after the transmission is
1037  * finished.
1038  *
1039  * Returns the size of copied data, or a negative error code on failure.
1040  */
1041 int snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
1042                               unsigned char *buffer, int count)
1043 {
1044         unsigned long flags;
1045         int result, count1;
1046         struct snd_rawmidi_runtime *runtime = substream->runtime;
1047
1048         if (runtime->buffer == NULL) {
1049                 snd_printd("snd_rawmidi_transmit_peek: output is not active!!!\n");
1050                 return -EINVAL;
1051         }
1052         result = 0;
1053         spin_lock_irqsave(&runtime->lock, flags);
1054         if (runtime->avail >= runtime->buffer_size) {
1055                 /* warning: lowlevel layer MUST trigger down the hardware */
1056                 goto __skip;
1057         }
1058         if (count == 1) {       /* special case, faster code */
1059                 *buffer = runtime->buffer[runtime->hw_ptr];
1060                 result++;
1061         } else {
1062                 count1 = runtime->buffer_size - runtime->hw_ptr;
1063                 if (count1 > count)
1064                         count1 = count;
1065                 if (count1 > (int)(runtime->buffer_size - runtime->avail))
1066                         count1 = runtime->buffer_size - runtime->avail;
1067                 memcpy(buffer, runtime->buffer + runtime->hw_ptr, count1);
1068                 count -= count1;
1069                 result += count1;
1070                 if (count > 0) {
1071                         if (count > (int)(runtime->buffer_size - runtime->avail - count1))
1072                                 count = runtime->buffer_size - runtime->avail - count1;
1073                         memcpy(buffer + count1, runtime->buffer, count);
1074                         result += count;
1075                 }
1076         }
1077       __skip:
1078         spin_unlock_irqrestore(&runtime->lock, flags);
1079         return result;
1080 }
1081
1082 /**
1083  * snd_rawmidi_transmit_ack - acknowledge the transmission
1084  * @substream: the rawmidi substream
1085  * @count: the tranferred count
1086  *
1087  * Advances the hardware pointer for the internal output buffer with
1088  * the given size and updates the condition.
1089  * Call after the transmission is finished.
1090  *
1091  * Returns the advanced size if successful, or a negative error code on failure.
1092  */
1093 int snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count)
1094 {
1095         unsigned long flags;
1096         struct snd_rawmidi_runtime *runtime = substream->runtime;
1097
1098         if (runtime->buffer == NULL) {
1099                 snd_printd("snd_rawmidi_transmit_ack: output is not active!!!\n");
1100                 return -EINVAL;
1101         }
1102         spin_lock_irqsave(&runtime->lock, flags);
1103         snd_assert(runtime->avail + count <= runtime->buffer_size, );
1104         runtime->hw_ptr += count;
1105         runtime->hw_ptr %= runtime->buffer_size;
1106         runtime->avail += count;
1107         substream->bytes += count;
1108         if (count > 0) {
1109                 if (runtime->drain || snd_rawmidi_ready(substream))
1110                         wake_up(&runtime->sleep);
1111         }
1112         spin_unlock_irqrestore(&runtime->lock, flags);
1113         return count;
1114 }
1115
1116 /**
1117  * snd_rawmidi_transmit - copy from the buffer to the device
1118  * @substream: the rawmidi substream
1119  * @buffer: the buffer pointer
1120  * @count: the data size to transfer
1121  *
1122  * Copies data from the buffer to the device and advances the pointer.
1123  *
1124  * Returns the copied size if successful, or a negative error code on failure.
1125  */
1126 int snd_rawmidi_transmit(struct snd_rawmidi_substream *substream,
1127                          unsigned char *buffer, int count)
1128 {
1129         count = snd_rawmidi_transmit_peek(substream, buffer, count);
1130         if (count < 0)
1131                 return count;
1132         return snd_rawmidi_transmit_ack(substream, count);
1133 }
1134
1135 static long snd_rawmidi_kernel_write1(struct snd_rawmidi_substream *substream,
1136                                       const unsigned char __user *userbuf,
1137                                       const unsigned char *kernelbuf,
1138                                       long count)
1139 {
1140         unsigned long flags;
1141         long count1, result;
1142         struct snd_rawmidi_runtime *runtime = substream->runtime;
1143
1144         snd_assert(kernelbuf != NULL || userbuf != NULL, return -EINVAL);
1145         snd_assert(runtime->buffer != NULL, return -EINVAL);
1146
1147         result = 0;
1148         spin_lock_irqsave(&runtime->lock, flags);
1149         if (substream->append) {
1150                 if ((long)runtime->avail < count) {
1151                         spin_unlock_irqrestore(&runtime->lock, flags);
1152                         return -EAGAIN;
1153                 }
1154         }
1155         while (count > 0 && runtime->avail > 0) {
1156                 count1 = runtime->buffer_size - runtime->appl_ptr;
1157                 if (count1 > count)
1158                         count1 = count;
1159                 if (count1 > (long)runtime->avail)
1160                         count1 = runtime->avail;
1161                 if (kernelbuf)
1162                         memcpy(runtime->buffer + runtime->appl_ptr,
1163                                kernelbuf + result, count1);
1164                 else if (userbuf) {
1165                         spin_unlock_irqrestore(&runtime->lock, flags);
1166                         if (copy_from_user(runtime->buffer + runtime->appl_ptr,
1167                                            userbuf + result, count1)) {
1168                                 spin_lock_irqsave(&runtime->lock, flags);
1169                                 result = result > 0 ? result : -EFAULT;
1170                                 goto __end;
1171                         }
1172                         spin_lock_irqsave(&runtime->lock, flags);
1173                 }
1174                 runtime->appl_ptr += count1;
1175                 runtime->appl_ptr %= runtime->buffer_size;
1176                 runtime->avail -= count1;
1177                 result += count1;
1178                 count -= count1;
1179         }
1180       __end:
1181         count1 = runtime->avail < runtime->buffer_size;
1182         spin_unlock_irqrestore(&runtime->lock, flags);
1183         if (count1)
1184                 snd_rawmidi_output_trigger(substream, 1);
1185         return result;
1186 }
1187
1188 long snd_rawmidi_kernel_write(struct snd_rawmidi_substream *substream,
1189                               const unsigned char *buf, long count)
1190 {
1191         return snd_rawmidi_kernel_write1(substream, NULL, buf, count);
1192 }
1193
1194 static ssize_t snd_rawmidi_write(struct file *file, const char __user *buf,
1195                                  size_t count, loff_t *offset)
1196 {
1197         long result, timeout;
1198         int count1;
1199         struct snd_rawmidi_file *rfile;
1200         struct snd_rawmidi_runtime *runtime;
1201         struct snd_rawmidi_substream *substream;
1202
1203         rfile = file->private_data;
1204         substream = rfile->output;
1205         runtime = substream->runtime;
1206         /* we cannot put an atomic message to our buffer */
1207         if (substream->append && count > runtime->buffer_size)
1208                 return -EIO;
1209         result = 0;
1210         while (count > 0) {
1211                 spin_lock_irq(&runtime->lock);
1212                 while (!snd_rawmidi_ready_append(substream, count)) {
1213                         wait_queue_t wait;
1214                         if (file->f_flags & O_NONBLOCK) {
1215                                 spin_unlock_irq(&runtime->lock);
1216                                 return result > 0 ? result : -EAGAIN;
1217                         }
1218                         init_waitqueue_entry(&wait, current);
1219                         add_wait_queue(&runtime->sleep, &wait);
1220                         set_current_state(TASK_INTERRUPTIBLE);
1221                         spin_unlock_irq(&runtime->lock);
1222                         timeout = schedule_timeout(30 * HZ);
1223                         remove_wait_queue(&runtime->sleep, &wait);
1224                         if (signal_pending(current))
1225                                 return result > 0 ? result : -ERESTARTSYS;
1226                         if (!runtime->avail && !timeout)
1227                                 return result > 0 ? result : -EIO;
1228                         spin_lock_irq(&runtime->lock);
1229                 }
1230                 spin_unlock_irq(&runtime->lock);
1231                 count1 = snd_rawmidi_kernel_write1(substream, buf, NULL, count);
1232                 if (count1 < 0)
1233                         return result > 0 ? result : count1;
1234                 result += count1;
1235                 buf += count1;
1236                 if ((size_t)count1 < count && (file->f_flags & O_NONBLOCK))
1237                         break;
1238                 count -= count1;
1239         }
1240         if (file->f_flags & O_SYNC) {
1241                 spin_lock_irq(&runtime->lock);
1242                 while (runtime->avail != runtime->buffer_size) {
1243                         wait_queue_t wait;
1244                         unsigned int last_avail = runtime->avail;
1245                         init_waitqueue_entry(&wait, current);
1246                         add_wait_queue(&runtime->sleep, &wait);
1247                         set_current_state(TASK_INTERRUPTIBLE);
1248                         spin_unlock_irq(&runtime->lock);
1249                         timeout = schedule_timeout(30 * HZ);
1250                         remove_wait_queue(&runtime->sleep, &wait);
1251                         if (signal_pending(current))
1252                                 return result > 0 ? result : -ERESTARTSYS;
1253                         if (runtime->avail == last_avail && !timeout)
1254                                 return result > 0 ? result : -EIO;
1255                         spin_lock_irq(&runtime->lock);
1256                 }
1257                 spin_unlock_irq(&runtime->lock);
1258         }
1259         return result;
1260 }
1261
1262 static unsigned int snd_rawmidi_poll(struct file *file, poll_table * wait)
1263 {
1264         struct snd_rawmidi_file *rfile;
1265         struct snd_rawmidi_runtime *runtime;
1266         unsigned int mask;
1267
1268         rfile = file->private_data;
1269         if (rfile->input != NULL) {
1270                 runtime = rfile->input->runtime;
1271                 snd_rawmidi_input_trigger(rfile->input, 1);
1272                 poll_wait(file, &runtime->sleep, wait);
1273         }
1274         if (rfile->output != NULL) {
1275                 runtime = rfile->output->runtime;
1276                 poll_wait(file, &runtime->sleep, wait);
1277         }
1278         mask = 0;
1279         if (rfile->input != NULL) {
1280                 if (snd_rawmidi_ready(rfile->input))
1281                         mask |= POLLIN | POLLRDNORM;
1282         }
1283         if (rfile->output != NULL) {
1284                 if (snd_rawmidi_ready(rfile->output))
1285                         mask |= POLLOUT | POLLWRNORM;
1286         }
1287         return mask;
1288 }
1289
1290 /*
1291  */
1292 #ifdef CONFIG_COMPAT
1293 #include "rawmidi_compat.c"
1294 #else
1295 #define snd_rawmidi_ioctl_compat        NULL
1296 #endif
1297
1298 /*
1299
1300  */
1301
1302 static void snd_rawmidi_proc_info_read(struct snd_info_entry *entry,
1303                                        struct snd_info_buffer *buffer)
1304 {
1305         struct snd_rawmidi *rmidi;
1306         struct snd_rawmidi_substream *substream;
1307         struct snd_rawmidi_runtime *runtime;
1308
1309         rmidi = entry->private_data;
1310         snd_iprintf(buffer, "%s\n\n", rmidi->name);
1311         mutex_lock(&rmidi->open_mutex);
1312         if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_OUTPUT) {
1313                 list_for_each_entry(substream,
1314                                     &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams,
1315                                     list) {
1316                         snd_iprintf(buffer,
1317                                     "Output %d\n"
1318                                     "  Tx bytes     : %lu\n",
1319                                     substream->number,
1320                                     (unsigned long) substream->bytes);
1321                         if (substream->opened) {
1322                                 runtime = substream->runtime;
1323                                 snd_iprintf(buffer,
1324                                     "  Mode         : %s\n"
1325                                     "  Buffer size  : %lu\n"
1326                                     "  Avail        : %lu\n",
1327                                     runtime->oss ? "OSS compatible" : "native",
1328                                     (unsigned long) runtime->buffer_size,
1329                                     (unsigned long) runtime->avail);
1330                         }
1331                 }
1332         }
1333         if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_INPUT) {
1334                 list_for_each_entry(substream,
1335                                     &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams,
1336                                     list) {
1337                         snd_iprintf(buffer,
1338                                     "Input %d\n"
1339                                     "  Rx bytes     : %lu\n",
1340                                     substream->number,
1341                                     (unsigned long) substream->bytes);
1342                         if (substream->opened) {
1343                                 runtime = substream->runtime;
1344                                 snd_iprintf(buffer,
1345                                             "  Buffer size  : %lu\n"
1346                                             "  Avail        : %lu\n"
1347                                             "  Overruns     : %lu\n",
1348                                             (unsigned long) runtime->buffer_size,
1349                                             (unsigned long) runtime->avail,
1350                                             (unsigned long) runtime->xruns);
1351                         }
1352                 }
1353         }
1354         mutex_unlock(&rmidi->open_mutex);
1355 }
1356
1357 /*
1358  *  Register functions
1359  */
1360
1361 static const struct file_operations snd_rawmidi_f_ops =
1362 {
1363         .owner =        THIS_MODULE,
1364         .read =         snd_rawmidi_read,
1365         .write =        snd_rawmidi_write,
1366         .open =         snd_rawmidi_open,
1367         .release =      snd_rawmidi_release,
1368         .poll =         snd_rawmidi_poll,
1369         .unlocked_ioctl =       snd_rawmidi_ioctl,
1370         .compat_ioctl = snd_rawmidi_ioctl_compat,
1371 };
1372
1373 static int snd_rawmidi_alloc_substreams(struct snd_rawmidi *rmidi,
1374                                         struct snd_rawmidi_str *stream,
1375                                         int direction,
1376                                         int count)
1377 {
1378         struct snd_rawmidi_substream *substream;
1379         int idx;
1380
1381         for (idx = 0; idx < count; idx++) {
1382                 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
1383                 if (substream == NULL) {
1384                         snd_printk(KERN_ERR "rawmidi: cannot allocate substream\n");
1385                         return -ENOMEM;
1386                 }
1387                 substream->stream = direction;
1388                 substream->number = idx;
1389                 substream->rmidi = rmidi;
1390                 substream->pstr = stream;
1391                 list_add_tail(&substream->list, &stream->substreams);
1392                 stream->substream_count++;
1393         }
1394         return 0;
1395 }
1396
1397 /**
1398  * snd_rawmidi_new - create a rawmidi instance
1399  * @card: the card instance
1400  * @id: the id string
1401  * @device: the device index
1402  * @output_count: the number of output streams
1403  * @input_count: the number of input streams
1404  * @rrawmidi: the pointer to store the new rawmidi instance
1405  *
1406  * Creates a new rawmidi instance.
1407  * Use snd_rawmidi_set_ops() to set the operators to the new instance.
1408  *
1409  * Returns zero if successful, or a negative error code on failure.
1410  */
1411 int snd_rawmidi_new(struct snd_card *card, char *id, int device,
1412                     int output_count, int input_count,
1413                     struct snd_rawmidi ** rrawmidi)
1414 {
1415         struct snd_rawmidi *rmidi;
1416         int err;
1417         static struct snd_device_ops ops = {
1418                 .dev_free = snd_rawmidi_dev_free,
1419                 .dev_register = snd_rawmidi_dev_register,
1420                 .dev_disconnect = snd_rawmidi_dev_disconnect,
1421         };
1422
1423         snd_assert(rrawmidi != NULL, return -EINVAL);
1424         *rrawmidi = NULL;
1425         snd_assert(card != NULL, return -ENXIO);
1426         rmidi = kzalloc(sizeof(*rmidi), GFP_KERNEL);
1427         if (rmidi == NULL) {
1428                 snd_printk(KERN_ERR "rawmidi: cannot allocate\n");
1429                 return -ENOMEM;
1430         }
1431         rmidi->card = card;
1432         rmidi->device = device;
1433         mutex_init(&rmidi->open_mutex);
1434         init_waitqueue_head(&rmidi->open_wait);
1435         INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams);
1436         INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams);
1437
1438         if (id != NULL)
1439                 strlcpy(rmidi->id, id, sizeof(rmidi->id));
1440         if ((err = snd_rawmidi_alloc_substreams(rmidi,
1441                                                 &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT],
1442                                                 SNDRV_RAWMIDI_STREAM_INPUT,
1443                                                 input_count)) < 0) {
1444                 snd_rawmidi_free(rmidi);
1445                 return err;
1446         }
1447         if ((err = snd_rawmidi_alloc_substreams(rmidi,
1448                                                 &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT],
1449                                                 SNDRV_RAWMIDI_STREAM_OUTPUT,
1450                                                 output_count)) < 0) {
1451                 snd_rawmidi_free(rmidi);
1452                 return err;
1453         }
1454         if ((err = snd_device_new(card, SNDRV_DEV_RAWMIDI, rmidi, &ops)) < 0) {
1455                 snd_rawmidi_free(rmidi);
1456                 return err;
1457         }
1458         *rrawmidi = rmidi;
1459         return 0;
1460 }
1461
1462 static void snd_rawmidi_free_substreams(struct snd_rawmidi_str *stream)
1463 {
1464         struct snd_rawmidi_substream *substream;
1465
1466         while (!list_empty(&stream->substreams)) {
1467                 substream = list_entry(stream->substreams.next, struct snd_rawmidi_substream, list);
1468                 list_del(&substream->list);
1469                 kfree(substream);
1470         }
1471 }
1472
1473 static int snd_rawmidi_free(struct snd_rawmidi *rmidi)
1474 {
1475         snd_assert(rmidi != NULL, return -ENXIO);
1476
1477         snd_info_free_entry(rmidi->proc_entry);
1478         rmidi->proc_entry = NULL;
1479         mutex_lock(&register_mutex);
1480         if (rmidi->ops && rmidi->ops->dev_unregister)
1481                 rmidi->ops->dev_unregister(rmidi);
1482         mutex_unlock(&register_mutex);
1483
1484         snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT]);
1485         snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT]);
1486         if (rmidi->private_free)
1487                 rmidi->private_free(rmidi);
1488         kfree(rmidi);
1489         return 0;
1490 }
1491
1492 static int snd_rawmidi_dev_free(struct snd_device *device)
1493 {
1494         struct snd_rawmidi *rmidi = device->device_data;
1495         return snd_rawmidi_free(rmidi);
1496 }
1497
1498 #if defined(CONFIG_SND_SEQUENCER) || (defined(MODULE) && defined(CONFIG_SND_SEQUENCER_MODULE))
1499 static void snd_rawmidi_dev_seq_free(struct snd_seq_device *device)
1500 {
1501         struct snd_rawmidi *rmidi = device->private_data;
1502         rmidi->seq_dev = NULL;
1503 }
1504 #endif
1505
1506 static int snd_rawmidi_dev_register(struct snd_device *device)
1507 {
1508         int err;
1509         struct snd_info_entry *entry;
1510         char name[16];
1511         struct snd_rawmidi *rmidi = device->device_data;
1512
1513         if (rmidi->device >= SNDRV_RAWMIDI_DEVICES)
1514                 return -ENOMEM;
1515         mutex_lock(&register_mutex);
1516         if (snd_rawmidi_search(rmidi->card, rmidi->device)) {
1517                 mutex_unlock(&register_mutex);
1518                 return -EBUSY;
1519         }
1520         list_add_tail(&rmidi->list, &snd_rawmidi_devices);
1521         sprintf(name, "midiC%iD%i", rmidi->card->number, rmidi->device);
1522         if ((err = snd_register_device(SNDRV_DEVICE_TYPE_RAWMIDI,
1523                                        rmidi->card, rmidi->device,
1524                                        &snd_rawmidi_f_ops, rmidi, name)) < 0) {
1525                 snd_printk(KERN_ERR "unable to register rawmidi device %i:%i\n", rmidi->card->number, rmidi->device);
1526                 list_del(&rmidi->list);
1527                 mutex_unlock(&register_mutex);
1528                 return err;
1529         }
1530         if (rmidi->ops && rmidi->ops->dev_register &&
1531             (err = rmidi->ops->dev_register(rmidi)) < 0) {
1532                 snd_unregister_device(SNDRV_DEVICE_TYPE_RAWMIDI, rmidi->card, rmidi->device);
1533                 list_del(&rmidi->list);
1534                 mutex_unlock(&register_mutex);
1535                 return err;
1536         }
1537 #ifdef CONFIG_SND_OSSEMUL
1538         rmidi->ossreg = 0;
1539         if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1540                 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1541                                             rmidi->card, 0, &snd_rawmidi_f_ops,
1542                                             rmidi, name) < 0) {
1543                         snd_printk(KERN_ERR "unable to register OSS rawmidi device %i:%i\n", rmidi->card->number, 0);
1544                 } else {
1545                         rmidi->ossreg++;
1546 #ifdef SNDRV_OSS_INFO_DEV_MIDI
1547                         snd_oss_info_register(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number, rmidi->name);
1548 #endif
1549                 }
1550         }
1551         if ((int)rmidi->device == amidi_map[rmidi->card->number]) {
1552                 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1553                                             rmidi->card, 1, &snd_rawmidi_f_ops,
1554                                             rmidi, name) < 0) {
1555                         snd_printk(KERN_ERR "unable to register OSS rawmidi device %i:%i\n", rmidi->card->number, 1);
1556                 } else {
1557                         rmidi->ossreg++;
1558                 }
1559         }
1560 #endif /* CONFIG_SND_OSSEMUL */
1561         mutex_unlock(&register_mutex);
1562         sprintf(name, "midi%d", rmidi->device);
1563         entry = snd_info_create_card_entry(rmidi->card, name, rmidi->card->proc_root);
1564         if (entry) {
1565                 entry->private_data = rmidi;
1566                 entry->c.text.read = snd_rawmidi_proc_info_read;
1567                 if (snd_info_register(entry) < 0) {
1568                         snd_info_free_entry(entry);
1569                         entry = NULL;
1570                 }
1571         }
1572         rmidi->proc_entry = entry;
1573 #if defined(CONFIG_SND_SEQUENCER) || (defined(MODULE) && defined(CONFIG_SND_SEQUENCER_MODULE))
1574         if (!rmidi->ops || !rmidi->ops->dev_register) { /* own registration mechanism */
1575                 if (snd_seq_device_new(rmidi->card, rmidi->device, SNDRV_SEQ_DEV_ID_MIDISYNTH, 0, &rmidi->seq_dev) >= 0) {
1576                         rmidi->seq_dev->private_data = rmidi;
1577                         rmidi->seq_dev->private_free = snd_rawmidi_dev_seq_free;
1578                         sprintf(rmidi->seq_dev->name, "MIDI %d-%d", rmidi->card->number, rmidi->device);
1579                         snd_device_register(rmidi->card, rmidi->seq_dev);
1580                 }
1581         }
1582 #endif
1583         return 0;
1584 }
1585
1586 static int snd_rawmidi_dev_disconnect(struct snd_device *device)
1587 {
1588         struct snd_rawmidi *rmidi = device->device_data;
1589
1590         mutex_lock(&register_mutex);
1591         list_del_init(&rmidi->list);
1592 #ifdef CONFIG_SND_OSSEMUL
1593         if (rmidi->ossreg) {
1594                 if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1595                         snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 0);
1596 #ifdef SNDRV_OSS_INFO_DEV_MIDI
1597                         snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number);
1598 #endif
1599                 }
1600                 if ((int)rmidi->device == amidi_map[rmidi->card->number])
1601                         snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 1);
1602                 rmidi->ossreg = 0;
1603         }
1604 #endif /* CONFIG_SND_OSSEMUL */
1605         snd_unregister_device(SNDRV_DEVICE_TYPE_RAWMIDI, rmidi->card, rmidi->device);
1606         mutex_unlock(&register_mutex);
1607         return 0;
1608 }
1609
1610 /**
1611  * snd_rawmidi_set_ops - set the rawmidi operators
1612  * @rmidi: the rawmidi instance
1613  * @stream: the stream direction, SNDRV_RAWMIDI_STREAM_XXX
1614  * @ops: the operator table
1615  *
1616  * Sets the rawmidi operators for the given stream direction.
1617  */
1618 void snd_rawmidi_set_ops(struct snd_rawmidi *rmidi, int stream,
1619                          struct snd_rawmidi_ops *ops)
1620 {
1621         struct snd_rawmidi_substream *substream;
1622
1623         list_for_each_entry(substream, &rmidi->streams[stream].substreams, list)
1624                 substream->ops = ops;
1625 }
1626
1627 /*
1628  *  ENTRY functions
1629  */
1630
1631 static int __init alsa_rawmidi_init(void)
1632 {
1633
1634         snd_ctl_register_ioctl(snd_rawmidi_control_ioctl);
1635         snd_ctl_register_ioctl_compat(snd_rawmidi_control_ioctl);
1636 #ifdef CONFIG_SND_OSSEMUL
1637         { int i;
1638         /* check device map table */
1639         for (i = 0; i < SNDRV_CARDS; i++) {
1640                 if (midi_map[i] < 0 || midi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1641                         snd_printk(KERN_ERR "invalid midi_map[%d] = %d\n", i, midi_map[i]);
1642                         midi_map[i] = 0;
1643                 }
1644                 if (amidi_map[i] < 0 || amidi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1645                         snd_printk(KERN_ERR "invalid amidi_map[%d] = %d\n", i, amidi_map[i]);
1646                         amidi_map[i] = 1;
1647                 }
1648         }
1649         }
1650 #endif /* CONFIG_SND_OSSEMUL */
1651         return 0;
1652 }
1653
1654 static void __exit alsa_rawmidi_exit(void)
1655 {
1656         snd_ctl_unregister_ioctl(snd_rawmidi_control_ioctl);
1657         snd_ctl_unregister_ioctl_compat(snd_rawmidi_control_ioctl);
1658 }
1659
1660 module_init(alsa_rawmidi_init)
1661 module_exit(alsa_rawmidi_exit)
1662
1663 EXPORT_SYMBOL(snd_rawmidi_output_params);
1664 EXPORT_SYMBOL(snd_rawmidi_input_params);
1665 EXPORT_SYMBOL(snd_rawmidi_drop_output);
1666 EXPORT_SYMBOL(snd_rawmidi_drain_output);
1667 EXPORT_SYMBOL(snd_rawmidi_drain_input);
1668 EXPORT_SYMBOL(snd_rawmidi_receive);
1669 EXPORT_SYMBOL(snd_rawmidi_transmit_empty);
1670 EXPORT_SYMBOL(snd_rawmidi_transmit_peek);
1671 EXPORT_SYMBOL(snd_rawmidi_transmit_ack);
1672 EXPORT_SYMBOL(snd_rawmidi_transmit);
1673 EXPORT_SYMBOL(snd_rawmidi_new);
1674 EXPORT_SYMBOL(snd_rawmidi_set_ops);
1675 EXPORT_SYMBOL(snd_rawmidi_info_select);
1676 EXPORT_SYMBOL(snd_rawmidi_kernel_open);
1677 EXPORT_SYMBOL(snd_rawmidi_kernel_release);
1678 EXPORT_SYMBOL(snd_rawmidi_kernel_read);
1679 EXPORT_SYMBOL(snd_rawmidi_kernel_write);