sound/core/rawmidi.c

   1 /*
   2  *  Abstract layer for MIDI v1.0 stream
   3  *  Copyright (c) by Jaroslav Kysela <perex@suse.cz>
   4  *
   5  *
   6  *   This program is free software; you can redistribute it and/or modify
   7  *   it under the terms of the GNU General Public License as published by
   8  *   the Free Software Foundation; either version 2 of the License, or
   9  *   (at your option) any later version.
  10  *
  11  *   This program is distributed in the hope that it will be useful,
  12  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *   GNU General Public License for more details.
  15  *
  16  *   You should have received a copy of the GNU General Public License
  17  *   along with this program; if not, write to the Free Software
  18  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  19  *
  20  */
  21
  22 #include <sound/driver.h>
  23 #include <sound/core.h>
  24 #include <linux/major.h>
  25 #include <linux/init.h>
  26 #include <linux/smp_lock.h>
  27 #include <linux/sched.h>
  28 #include <linux/slab.h>
  29 #include <linux/time.h>
  30 #include <linux/wait.h>
  31 #include <linux/moduleparam.h>
  32 #include <linux/delay.h>
  33 #include <linux/wait.h>
  34 #include <sound/rawmidi.h>
  35 #include <sound/info.h>
  36 #include <sound/control.h>
  37 #include <sound/minors.h>
  38 #include <sound/initval.h>
  39
  40 MODULE_AUTHOR("Jaroslav Kysela <perex@suse.cz>");
  41 MODULE_DESCRIPTION("Midlevel RawMidi code for ALSA.");
  42 MODULE_LICENSE("GPL");
  43
  44 #ifdef CONFIG_SND_OSSEMUL
  45 static int midi_map[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS-1)] = 0};
  46 static int amidi_map[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS-1)] = 1};
  47 module_param_array(midi_map, int, NULL, 0444);
  48 MODULE_PARM_DESC(midi_map, "Raw MIDI device number assigned to 1st OSS device.");
  49 module_param_array(amidi_map, int, NULL, 0444);
  50 MODULE_PARM_DESC(amidi_map, "Raw MIDI device number assigned to 2nd OSS device.");
  51 #endif /* CONFIG_SND_OSSEMUL */
  52
  53 static int snd_rawmidi_free(struct snd_rawmidi *rawmidi);
  54 static int snd_rawmidi_dev_free(struct snd_device *device);
  55 static int snd_rawmidi_dev_register(struct snd_device *device);
  56 static int snd_rawmidi_dev_disconnect(struct snd_device *device);
  57 static int snd_rawmidi_dev_unregister(struct snd_device *device);
  58
  59 static struct snd_rawmidi *snd_rawmidi_devices[SNDRV_CARDS * SNDRV_RAWMIDI_DEVICES];
  60
  61 static DECLARE_MUTEX(register_mutex);
  62
  63 static inline unsigned short snd_rawmidi_file_flags(struct file *file)
  64 {
  65         switch (file->f_mode & (FMODE_READ | FMODE_WRITE)) {
  66         case FMODE_WRITE:
  67                 return SNDRV_RAWMIDI_LFLG_OUTPUT;
  68         case FMODE_READ:
  69                 return SNDRV_RAWMIDI_LFLG_INPUT;
  70         default:
  71                 return SNDRV_RAWMIDI_LFLG_OPEN;
  72         }
  73 }
  74
  75 static inline int snd_rawmidi_ready(struct snd_rawmidi_substream *substream)
  76 {
  77         struct snd_rawmidi_runtime *runtime = substream->runtime;
  78         return runtime->avail >= runtime->avail_min;
  79 }
  80
  81 static inline int snd_rawmidi_ready_append(struct snd_rawmidi_substream *substream,
  82                                            size_t count)
  83 {
  84         struct snd_rawmidi_runtime *runtime = substream->runtime;
  85         return runtime->avail >= runtime->avail_min &&
  86                (!substream->append || runtime->avail >= count);
  87 }
  88
  89 static void snd_rawmidi_input_event_tasklet(unsigned long data)
  90 {
  91         struct snd_rawmidi_substream *substream = (struct snd_rawmidi_substream *)data;
  92         substream->runtime->event(substream);
  93 }
  94
  95 static void snd_rawmidi_output_trigger_tasklet(unsigned long data)
  96 {
  97         struct snd_rawmidi_substream *substream = (struct snd_rawmidi_substream *)data;
  98         substream->ops->trigger(substream, 1);
  99 }
 100
 101 static int snd_rawmidi_runtime_create(struct snd_rawmidi_substream *substream)
 102 {
 103         struct snd_rawmidi_runtime *runtime;
 104
 105         if ((runtime = kzalloc(sizeof(*runtime), GFP_KERNEL)) == NULL)
 106                 return -ENOMEM;
 107         spin_lock_init(&runtime->lock);
 108         init_waitqueue_head(&runtime->sleep);
 109         if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
 110                 tasklet_init(&runtime->tasklet,
 111                              snd_rawmidi_input_event_tasklet,
 112                              (unsigned long)substream);
 113         else
 114                 tasklet_init(&runtime->tasklet,
 115                              snd_rawmidi_output_trigger_tasklet,
 116                              (unsigned long)substream);
 117         runtime->event = NULL;
 118         runtime->buffer_size = PAGE_SIZE;
 119         runtime->avail_min = 1;
 120         if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
 121                 runtime->avail = 0;
 122         else
 123                 runtime->avail = runtime->buffer_size;
 124         if ((runtime->buffer = kmalloc(runtime->buffer_size, GFP_KERNEL)) == NULL) {
 125                 kfree(runtime);
 126                 return -ENOMEM;
 127         }
 128         runtime->appl_ptr = runtime->hw_ptr = 0;
 129         substream->runtime = runtime;
 130         return 0;
 131 }
 132
 133 static int snd_rawmidi_runtime_free(struct snd_rawmidi_substream *substream)
 134 {
 135         struct snd_rawmidi_runtime *runtime = substream->runtime;
 136
 137         kfree(runtime->buffer);
 138         kfree(runtime);
 139         substream->runtime = NULL;
 140         return 0;
 141 }
 142
 143 static inline void snd_rawmidi_output_trigger(struct snd_rawmidi_substream *substream,int up)
 144 {
 145         if (up) {
 146                 tasklet_hi_schedule(&substream->runtime->tasklet);
 147         } else {
 148                 tasklet_kill(&substream->runtime->tasklet);
 149                 substream->ops->trigger(substream, 0);
 150         }
 151 }
 152
 153 static void snd_rawmidi_input_trigger(struct snd_rawmidi_substream *substream, int up)
 154 {
 155         substream->ops->trigger(substream, up);
 156         if (!up && substream->runtime->event)
 157                 tasklet_kill(&substream->runtime->tasklet);
 158 }
 159
 160 int snd_rawmidi_drop_output(struct snd_rawmidi_substream *substream)
 161 {
 162         unsigned long flags;
 163         struct snd_rawmidi_runtime *runtime = substream->runtime;
 164
 165         snd_rawmidi_output_trigger(substream, 0);
 166         runtime->drain = 0;
 167         spin_lock_irqsave(&runtime->lock, flags);
 168         runtime->appl_ptr = runtime->hw_ptr = 0;
 169         runtime->avail = runtime->buffer_size;
 170         spin_unlock_irqrestore(&runtime->lock, flags);
 171         return 0;
 172 }
 173
 174 int snd_rawmidi_drain_output(struct snd_rawmidi_substream *substream)
 175 {
 176         int err;
 177         long timeout;
 178         struct snd_rawmidi_runtime *runtime = substream->runtime;
 179
 180         err = 0;
 181         runtime->drain = 1;
 182         timeout = wait_event_interruptible_timeout(runtime->sleep,
 183                                 (runtime->avail >= runtime->buffer_size),
 184                                 10*HZ);
 185         if (signal_pending(current))
 186                 err = -ERESTARTSYS;
 187         if (runtime->avail < runtime->buffer_size && !timeout) {
 188                 snd_printk(KERN_WARNING "rawmidi drain error (avail = %li, buffer_size = %li)\n", (long)runtime->avail, (long)runtime->buffer_size);
 189                 err = -EIO;
 190         }
 191         runtime->drain = 0;
 192         if (err != -ERESTARTSYS) {
 193                 /* we need wait a while to make sure that Tx FIFOs are empty */
 194                 if (substream->ops->drain)
 195                         substream->ops->drain(substream);
 196                 else
 197                         msleep(50);
 198                 snd_rawmidi_drop_output(substream);
 199         }
 200         return err;
 201 }
 202
 203 int snd_rawmidi_drain_input(struct snd_rawmidi_substream *substream)
 204 {
 205         unsigned long flags;
 206         struct snd_rawmidi_runtime *runtime = substream->runtime;
 207
 208         snd_rawmidi_input_trigger(substream, 0);
 209         runtime->drain = 0;
 210         spin_lock_irqsave(&runtime->lock, flags);
 211         runtime->appl_ptr = runtime->hw_ptr = 0;
 212         runtime->avail = 0;
 213         spin_unlock_irqrestore(&runtime->lock, flags);
 214         return 0;
 215 }
 216
 217 int snd_rawmidi_kernel_open(int cardnum, int device, int subdevice,
 218                             int mode, struct snd_rawmidi_file * rfile)
 219 {
 220         struct snd_rawmidi *rmidi;
 221         struct list_head *list1, *list2;
 222         struct snd_rawmidi_substream *sinput = NULL, *soutput = NULL;
 223         struct snd_rawmidi_runtime *input = NULL, *output = NULL;
 224         int err;
 225
 226         if (rfile)
 227                 rfile->input = rfile->output = NULL;
 228         rmidi = snd_rawmidi_devices[(cardnum * SNDRV_RAWMIDI_DEVICES) + device];
 229         if (rmidi == NULL) {
 230                 err = -ENODEV;
 231                 goto __error1;
 232         }
 233         if (!try_module_get(rmidi->card->module)) {
 234                 err = -EFAULT;
 235                 goto __error1;
 236         }
 237         if (!(mode & SNDRV_RAWMIDI_LFLG_NOOPENLOCK))
 238                 down(&rmidi->open_mutex);
 239         if (mode & SNDRV_RAWMIDI_LFLG_INPUT) {
 240                 if (!(rmidi->info_flags & SNDRV_RAWMIDI_INFO_INPUT)) {
 241                         err = -ENXIO;
 242                         goto __error;
 243                 }
 244                 if (subdevice >= 0 && (unsigned int)subdevice >= rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substream_count) {
 245                         err = -ENODEV;
 246                         goto __error;
 247                 }
 248                 if (rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substream_opened >=
 249                     rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substream_count) {
 250                         err = -EAGAIN;
 251                         goto __error;
 252                 }
 253         }
 254         if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) {
 255                 if (!(rmidi->info_flags & SNDRV_RAWMIDI_INFO_OUTPUT)) {
 256                         err = -ENXIO;
 257                         goto __error;
 258                 }
 259                 if (subdevice >= 0 && (unsigned int)subdevice >= rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substream_count) {
 260                         err = -ENODEV;
 261                         goto __error;
 262                 }
 263                 if (rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substream_opened >=
 264                     rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substream_count) {
 265                         err = -EAGAIN;
 266                         goto __error;
 267                 }
 268         }
 269         list1 = rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams.next;
 270         while (1) {
 271                 if (list1 == &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams) {
 272                         sinput = NULL;
 273                         if (mode & SNDRV_RAWMIDI_LFLG_INPUT) {
 274                                 err = -EAGAIN;
 275                                 goto __error;
 276                         }
 277                         break;
 278                 }
 279                 sinput = list_entry(list1, struct snd_rawmidi_substream, list);
 280                 if ((mode & SNDRV_RAWMIDI_LFLG_INPUT) && sinput->opened)
 281                         goto __nexti;
 282                 if (subdevice < 0 || (subdevice >= 0 && subdevice == sinput->number))
 283                         break;
 284               __nexti:
 285                 list1 = list1->next;
 286         }
 287         list2 = rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams.next;
 288         while (1) {
 289                 if (list2 == &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams) {
 290                         soutput = NULL;
 291                         if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) {
 292                                 err = -EAGAIN;
 293                                 goto __error;
 294                         }
 295                         break;
 296                 }
 297                 soutput = list_entry(list2, struct snd_rawmidi_substream, list);
 298                 if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) {
 299                         if (mode & SNDRV_RAWMIDI_LFLG_APPEND) {
 300                                 if (soutput->opened && !soutput->append)
 301                                         goto __nexto;
 302                         } else {
 303                                 if (soutput->opened)
 304                                         goto __nexto;
 305                         }
 306                 }
 307                 if (subdevice < 0 || (subdevice >= 0 && subdevice == soutput->number))
 308                         break;
 309               __nexto:
 310                 list2 = list2->next;
 311         }
 312         if (mode & SNDRV_RAWMIDI_LFLG_INPUT) {
 313                 if ((err = snd_rawmidi_runtime_create(sinput)) < 0)
 314                         goto __error;
 315                 input = sinput->runtime;
 316                 if ((err = sinput->ops->open(sinput)) < 0)
 317                         goto __error;
 318                 sinput->opened = 1;
 319                 rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substream_opened++;
 320         } else {
 321                 sinput = NULL;
 322         }
 323         if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) {
 324                 if (soutput->opened)
 325                         goto __skip_output;
 326                 if ((err = snd_rawmidi_runtime_create(soutput)) < 0) {
 327                         if (mode & SNDRV_RAWMIDI_LFLG_INPUT)
 328                                 sinput->ops->close(sinput);
 329                         goto __error;
 330                 }
 331                 output = soutput->runtime;
 332                 if ((err = soutput->ops->open(soutput)) < 0) {
 333                         if (mode & SNDRV_RAWMIDI_LFLG_INPUT)
 334                                 sinput->ops->close(sinput);
 335                         goto __error;
 336                 }
 337               __skip_output:
 338                 soutput->opened = 1;
 339                 if (mode & SNDRV_RAWMIDI_LFLG_APPEND)
 340                         soutput->append = 1;
 341                 if (soutput->use_count++ == 0)
 342                         soutput->active_sensing = 1;
 343                 rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substream_opened++;
 344         } else {
 345                 soutput = NULL;
 346         }
 347         if (!(mode & SNDRV_RAWMIDI_LFLG_NOOPENLOCK))
 348                 up(&rmidi->open_mutex);
 349         if (rfile) {
 350                 rfile->rmidi = rmidi;
 351                 rfile->input = sinput;
 352                 rfile->output = soutput;
 353         }
 354         return 0;
 355
 356       __error:
 357         if (input != NULL)
 358                 snd_rawmidi_runtime_free(sinput);
 359         if (output != NULL)
 360                 snd_rawmidi_runtime_free(soutput);
 361         module_put(rmidi->card->module);
 362         if (!(mode & SNDRV_RAWMIDI_LFLG_NOOPENLOCK))
 363                 up(&rmidi->open_mutex);
 364       __error1:
 365         return err;
 366 }
 367
 368 static int snd_rawmidi_open(struct inode *inode, struct file *file)
 369 {
 370         int maj = imajor(inode);
 371         int cardnum;
 372         struct snd_card *card;
 373         int device, subdevice;
 374         unsigned short fflags;
 375         int err;
 376         struct snd_rawmidi *rmidi;
 377         struct snd_rawmidi_file *rawmidi_file;
 378         wait_queue_t wait;
 379         struct list_head *list;
 380         struct snd_ctl_file *kctl;
 381
 382         if (maj == snd_major) {
 383                 cardnum = SNDRV_MINOR_CARD(iminor(inode));
 384                 cardnum %= SNDRV_CARDS;
 385                 device = SNDRV_MINOR_DEVICE(iminor(inode)) - SNDRV_MINOR_RAWMIDI;
 386                 device %= SNDRV_MINOR_RAWMIDIS;
 387 #ifdef CONFIG_SND_OSSEMUL
 388         } else if (maj == SOUND_MAJOR) {
 389                 cardnum = SNDRV_MINOR_OSS_CARD(iminor(inode));
 390                 cardnum %= SNDRV_CARDS;
 391                 device = SNDRV_MINOR_OSS_DEVICE(iminor(inode)) == SNDRV_MINOR_OSS_MIDI ?
 392                         midi_map[cardnum] : amidi_map[cardnum];
 393 #endif
 394         } else
 395                 return -ENXIO;
 396
 397         rmidi = snd_rawmidi_devices[(cardnum * SNDRV_RAWMIDI_DEVICES) + device];
 398         if (rmidi == NULL)
 399                 return -ENODEV;
 400 #ifdef CONFIG_SND_OSSEMUL
 401         if (maj == SOUND_MAJOR && !rmidi->ossreg)
 402                 return -ENXIO;
 403 #endif
 404         if ((file->f_flags & O_APPEND) && !(file->f_flags & O_NONBLOCK))
 405                 return -EINVAL;         /* invalid combination */
 406         card = rmidi->card;
 407         err = snd_card_file_add(card, file);
 408         if (err < 0)
 409                 return -ENODEV;
 410         fflags = snd_rawmidi_file_flags(file);
 411         if ((file->f_flags & O_APPEND) || maj == SOUND_MAJOR) /* OSS emul? */
 412                 fflags |= SNDRV_RAWMIDI_LFLG_APPEND;
 413         fflags |= SNDRV_RAWMIDI_LFLG_NOOPENLOCK;
 414         rawmidi_file = kmalloc(sizeof(*rawmidi_file), GFP_KERNEL);
 415         if (rawmidi_file == NULL) {
 416                 snd_card_file_remove(card, file);
 417                 return -ENOMEM;
 418         }
 419         init_waitqueue_entry(&wait, current);
 420         add_wait_queue(&rmidi->open_wait, &wait);
 421         down(&rmidi->open_mutex);
 422         while (1) {
 423                 subdevice = -1;
 424                 down_read(&card->controls_rwsem);
 425                 list_for_each(list, &card->ctl_files) {
 426                         kctl = snd_ctl_file(list);
 427                         if (kctl->pid == current->pid) {
 428                                 subdevice = kctl->prefer_rawmidi_subdevice;
 429                                 break;
 430                         }
 431                 }
 432                 up_read(&card->controls_rwsem);
 433                 err = snd_rawmidi_kernel_open(cardnum, device, subdevice, fflags, rawmidi_file);
 434                 if (err >= 0)
 435                         break;
 436                 if (err == -EAGAIN) {
 437                         if (file->f_flags & O_NONBLOCK) {
 438                                 err = -EBUSY;
 439                                 break;
 440                         }
 441                 } else
 442                         break;
 443                 set_current_state(TASK_INTERRUPTIBLE);
 444                 up(&rmidi->open_mutex);
 445                 schedule();
 446                 down(&rmidi->open_mutex);
 447                 if (signal_pending(current)) {
 448                         err = -ERESTARTSYS;
 449                         break;
 450                 }
 451         }
 452 #ifdef CONFIG_SND_OSSEMUL
 453         if (rawmidi_file->input && rawmidi_file->input->runtime)
 454                 rawmidi_file->input->runtime->oss = (maj == SOUND_MAJOR);
 455         if (rawmidi_file->output && rawmidi_file->output->runtime)
 456                 rawmidi_file->output->runtime->oss = (maj == SOUND_MAJOR);
 457 #endif
 458         remove_wait_queue(&rmidi->open_wait, &wait);
 459         if (err >= 0) {
 460                 file->private_data = rawmidi_file;
 461         } else {
 462                 snd_card_file_remove(card, file);
 463                 kfree(rawmidi_file);
 464         }
 465         up(&rmidi->open_mutex);
 466         return err;
 467 }
 468
 469 int snd_rawmidi_kernel_release(struct snd_rawmidi_file * rfile)
 470 {
 471         struct snd_rawmidi *rmidi;
 472         struct snd_rawmidi_substream *substream;
 473         struct snd_rawmidi_runtime *runtime;
 474
 475         snd_assert(rfile != NULL, return -ENXIO);
 476         snd_assert(rfile->input != NULL || rfile->output != NULL, return -ENXIO);
 477         rmidi = rfile->rmidi;
 478         down(&rmidi->open_mutex);
 479         if (rfile->input != NULL) {
 480                 substream = rfile->input;
 481                 rfile->input = NULL;
 482                 runtime = substream->runtime;
 483                 snd_rawmidi_input_trigger(substream, 0);
 484                 substream->ops->close(substream);
 485                 if (runtime->private_free != NULL)
 486                         runtime->private_free(substream);
 487                 snd_rawmidi_runtime_free(substream);
 488                 substream->opened = 0;
 489                 rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substream_opened--;
 490         }
 491         if (rfile->output != NULL) {
 492                 substream = rfile->output;
 493                 rfile->output = NULL;
 494                 if (--substream->use_count == 0) {
 495                         runtime = substream->runtime;
 496                         if (substream->active_sensing) {
 497                                 unsigned char buf = 0xfe;
 498                                 /* sending single active sensing message to shut the device up */
 499                                 snd_rawmidi_kernel_write(substream, &buf, 1);
 500                         }
 501                         if (snd_rawmidi_drain_output(substream) == -ERESTARTSYS)
 502                                 snd_rawmidi_output_trigger(substream, 0);
 503                         substream->ops->close(substream);
 504                         if (runtime->private_free != NULL)
 505                                 runtime->private_free(substream);
 506                         snd_rawmidi_runtime_free(substream);
 507                         substream->opened = 0;
 508                         substream->append = 0;
 509                 }
 510                 rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substream_opened--;
 511         }
 512         up(&rmidi->open_mutex);
 513         module_put(rmidi->card->module);
 514         return 0;
 515 }
 516
 517 static int snd_rawmidi_release(struct inode *inode, struct file *file)
 518 {
 519         struct snd_rawmidi_file *rfile;
 520         struct snd_rawmidi *rmidi;
 521         int err;
 522
 523         rfile = file->private_data;
 524         err = snd_rawmidi_kernel_release(rfile);
 525         rmidi = rfile->rmidi;
 526         wake_up(&rmidi->open_wait);
 527         kfree(rfile);
 528         snd_card_file_remove(rmidi->card, file);
 529         return err;
 530 }
 531
 532 int snd_rawmidi_info(struct snd_rawmidi_substream *substream,
 533                      struct snd_rawmidi_info *info)
 534 {
 535         struct snd_rawmidi *rmidi;
 536
 537         if (substream == NULL)
 538                 return -ENODEV;
 539         rmidi = substream->rmidi;
 540         memset(info, 0, sizeof(*info));
 541         info->card = rmidi->card->number;
 542         info->device = rmidi->device;
 543         info->subdevice = substream->number;
 544         info->stream = substream->stream;
 545         info->flags = rmidi->info_flags;
 546         strcpy(info->id, rmidi->id);
 547         strcpy(info->name, rmidi->name);
 548         strcpy(info->subname, substream->name);
 549         info->subdevices_count = substream->pstr->substream_count;
 550         info->subdevices_avail = (substream->pstr->substream_count -
 551                                   substream->pstr->substream_opened);
 552         return 0;
 553 }
 554
 555 static int snd_rawmidi_info_user(struct snd_rawmidi_substream *substream,
 556                                  struct snd_rawmidi_info __user * _info)
 557 {
 558         struct snd_rawmidi_info info;
 559         int err;
 560         if ((err = snd_rawmidi_info(substream, &info)) < 0)
 561                 return err;
 562         if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
 563                 return -EFAULT;
 564         return 0;
 565 }
 566
 567 int snd_rawmidi_info_select(struct snd_card *card, struct snd_rawmidi_info *info)
 568 {
 569         struct snd_rawmidi *rmidi;
 570         struct snd_rawmidi_str *pstr;
 571         struct snd_rawmidi_substream *substream;
 572         struct list_head *list;
 573         if (info->device >= SNDRV_RAWMIDI_DEVICES)
 574                 return -ENXIO;
 575         rmidi = snd_rawmidi_devices[card->number * SNDRV_RAWMIDI_DEVICES + info->device];
 576         if (!rmidi)
 577                 return -ENXIO;
 578         if (info->stream < 0 || info->stream > 1)
 579                 return -EINVAL;
 580         pstr = &rmidi->streams[info->stream];
 581         if (pstr->substream_count == 0)
 582                 return -ENOENT;
 583         if (info->subdevice >= pstr->substream_count)
 584                 return -ENXIO;
 585         list_for_each(list, &pstr->substreams) {
 586                 substream = list_entry(list, struct snd_rawmidi_substream, list);
 587                 if ((unsigned int)substream->number == info->subdevice)
 588                         return snd_rawmidi_info(substream, info);
 589         }
 590         return -ENXIO;
 591 }
 592
 593 static int snd_rawmidi_info_select_user(struct snd_card *card,
 594                                         struct snd_rawmidi_info __user *_info)
 595 {
 596         int err;
 597         struct snd_rawmidi_info info;
 598         if (get_user(info.device, &_info->device))
 599                 return -EFAULT;
 600         if (get_user(info.stream, &_info->stream))
 601                 return -EFAULT;
 602         if (get_user(info.subdevice, &_info->subdevice))
 603                 return -EFAULT;
 604         if ((err = snd_rawmidi_info_select(card, &info)) < 0)
 605                 return err;
 606         if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
 607                 return -EFAULT;
 608         return 0;
 609 }
 610
 611 int snd_rawmidi_output_params(struct snd_rawmidi_substream *substream,
 612                               struct snd_rawmidi_params * params)
 613 {
 614         char *newbuf;
 615         struct snd_rawmidi_runtime *runtime = substream->runtime;
 616
 617         if (substream->append && substream->use_count > 1)
 618                 return -EBUSY;
 619         snd_rawmidi_drain_output(substream);
 620         if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L) {
 621                 return -EINVAL;
 622         }
 623         if (params->avail_min < 1 || params->avail_min > params->buffer_size) {
 624                 return -EINVAL;
 625         }
 626         if (params->buffer_size != runtime->buffer_size) {
 627                 if ((newbuf = (char *) kmalloc(params->buffer_size, GFP_KERNEL)) == NULL)
 628                         return -ENOMEM;
 629                 kfree(runtime->buffer);
 630                 runtime->buffer = newbuf;
 631                 runtime->buffer_size = params->buffer_size;
 632         }
 633         runtime->avail_min = params->avail_min;
 634         substream->active_sensing = !params->no_active_sensing;
 635         return 0;
 636 }
 637
 638 int snd_rawmidi_input_params(struct snd_rawmidi_substream *substream,
 639                              struct snd_rawmidi_params * params)
 640 {
 641         char *newbuf;
 642         struct snd_rawmidi_runtime *runtime = substream->runtime;
 643
 644         snd_rawmidi_drain_input(substream);
 645         if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L) {
 646                 return -EINVAL;
 647         }
 648         if (params->avail_min < 1 || params->avail_min > params->buffer_size) {
 649                 return -EINVAL;
 650         }
 651         if (params->buffer_size != runtime->buffer_size) {
 652                 if ((newbuf = (char *) kmalloc(params->buffer_size, GFP_KERNEL)) == NULL)
 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         unsigned int tmp;
 807
 808         tmp = card->number * SNDRV_RAWMIDI_DEVICES;
 809         switch (cmd) {
 810         case SNDRV_CTL_IOCTL_RAWMIDI_NEXT_DEVICE:
 811         {
 812                 int device;
 813
 814                 if (get_user(device, (int __user *)argp))
 815                         return -EFAULT;
 816                 device = device < 0 ? 0 : device + 1;
 817                 while (device < SNDRV_RAWMIDI_DEVICES) {
 818                         if (snd_rawmidi_devices[tmp + device])
 819                                 break;
 820                         device++;
 821                 }
 822                 if (device == SNDRV_RAWMIDI_DEVICES)
 823                         device = -1;
 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 *buf, long count, int kernel)
 915 {
 916         unsigned long flags;
 917         long result = 0, count1;
 918         struct snd_rawmidi_runtime *runtime = substream->runtime;
 919
 920         while (count > 0 && runtime->avail) {
 921                 count1 = runtime->buffer_size - runtime->appl_ptr;
 922                 if (count1 > count)
 923                         count1 = count;
 924                 spin_lock_irqsave(&runtime->lock, flags);
 925                 if (count1 > (int)runtime->avail)
 926                         count1 = runtime->avail;
 927                 if (kernel) {
 928                         memcpy(buf + result, runtime->buffer + runtime->appl_ptr, count1);
 929                 } else {
 930                         spin_unlock_irqrestore(&runtime->lock, flags);
 931                         if (copy_to_user((char __user *)buf + result,
 932                                          runtime->buffer + runtime->appl_ptr, count1)) {
 933                                 return result > 0 ? result : -EFAULT;
 934                         }
 935                         spin_lock_irqsave(&runtime->lock, flags);
 936                 }
 937                 runtime->appl_ptr += count1;
 938                 runtime->appl_ptr %= runtime->buffer_size;
 939                 runtime->avail -= count1;
 940                 spin_unlock_irqrestore(&runtime->lock, flags);
 941                 result += count1;
 942                 count -= count1;
 943         }
 944         return result;
 945 }
 946
 947 long snd_rawmidi_kernel_read(struct snd_rawmidi_substream *substream,
 948                              unsigned char *buf, long count)
 949 {
 950         snd_rawmidi_input_trigger(substream, 1);
 951         return snd_rawmidi_kernel_read1(substream, buf, count, 1);
 952 }
 953
 954 static ssize_t snd_rawmidi_read(struct file *file, char __user *buf, size_t count,
 955                                 loff_t *offset)
 956 {
 957         long result;
 958         int count1;
 959         struct snd_rawmidi_file *rfile;
 960         struct snd_rawmidi_substream *substream;
 961         struct snd_rawmidi_runtime *runtime;
 962
 963         rfile = file->private_data;
 964         substream = rfile->input;
 965         if (substream == NULL)
 966                 return -EIO;
 967         runtime = substream->runtime;
 968         snd_rawmidi_input_trigger(substream, 1);
 969         result = 0;
 970         while (count > 0) {
 971                 spin_lock_irq(&runtime->lock);
 972                 while (!snd_rawmidi_ready(substream)) {
 973                         wait_queue_t wait;
 974                         if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
 975                                 spin_unlock_irq(&runtime->lock);
 976                                 return result > 0 ? result : -EAGAIN;
 977                         }
 978                         init_waitqueue_entry(&wait, current);
 979                         add_wait_queue(&runtime->sleep, &wait);
 980                         set_current_state(TASK_INTERRUPTIBLE);
 981                         spin_unlock_irq(&runtime->lock);
 982                         schedule();
 983                         remove_wait_queue(&runtime->sleep, &wait);
 984                         if (signal_pending(current))
 985                                 return result > 0 ? result : -ERESTARTSYS;
 986                         if (!runtime->avail)
 987                                 return result > 0 ? result : -EIO;
 988                         spin_lock_irq(&runtime->lock);
 989                 }
 990                 spin_unlock_irq(&runtime->lock);
 991                 count1 = snd_rawmidi_kernel_read1(substream,
 992                                                   (unsigned char __force *)buf,
 993                                                   count, 0);
 994                 if (count1 < 0)
 995                         return result > 0 ? result : count1;
 996                 result += count1;
 997                 buf += count1;
 998                 count -= count1;
 999         }
1000         return result;
1001 }
1002
1003 /**
1004  * snd_rawmidi_transmit_empty - check whether the output buffer is empty
1005  * @substream: the rawmidi substream
1006  *
1007  * Returns 1 if the internal output buffer is empty, 0 if not.
1008  */
1009 int snd_rawmidi_transmit_empty(struct snd_rawmidi_substream *substream)
1010 {
1011         struct snd_rawmidi_runtime *runtime = substream->runtime;
1012         int result;
1013         unsigned long flags;
1014
1015         if (runtime->buffer == NULL) {
1016                 snd_printd("snd_rawmidi_transmit_empty: output is not active!!!\n");
1017                 return 1;
1018         }
1019         spin_lock_irqsave(&runtime->lock, flags);
1020         result = runtime->avail >= runtime->buffer_size;
1021         spin_unlock_irqrestore(&runtime->lock, flags);
1022         return result;
1023 }
1024
1025 /**
1026  * snd_rawmidi_transmit_peek - copy data from the internal buffer
1027  * @substream: the rawmidi substream
1028  * @buffer: the buffer pointer
1029  * @count: data size to transfer
1030  *
1031  * Copies data from the internal output buffer to the given buffer.
1032  *
1033  * Call this in the interrupt handler when the midi output is ready,
1034  * and call snd_rawmidi_transmit_ack() after the transmission is
1035  * finished.
1036  *
1037  * Returns the size of copied data, or a negative error code on failure.
1038  */
1039 int snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
1040                               unsigned char *buffer, int count)
1041 {
1042         unsigned long flags;
1043         int result, count1;
1044         struct snd_rawmidi_runtime *runtime = substream->runtime;
1045
1046         if (runtime->buffer == NULL) {
1047                 snd_printd("snd_rawmidi_transmit_peek: output is not active!!!\n");
1048                 return -EINVAL;
1049         }
1050         result = 0;
1051         spin_lock_irqsave(&runtime->lock, flags);
1052         if (runtime->avail >= runtime->buffer_size) {
1053                 /* warning: lowlevel layer MUST trigger down the hardware */
1054                 goto __skip;
1055         }
1056         if (count == 1) {       /* special case, faster code */
1057                 *buffer = runtime->buffer[runtime->hw_ptr];
1058                 result++;
1059         } else {
1060                 count1 = runtime->buffer_size - runtime->hw_ptr;
1061                 if (count1 > count)
1062                         count1 = count;
1063                 if (count1 > (int)(runtime->buffer_size - runtime->avail))
1064                         count1 = runtime->buffer_size - runtime->avail;
1065                 memcpy(buffer, runtime->buffer + runtime->hw_ptr, count1);
1066                 count -= count1;
1067                 result += count1;
1068                 if (count > 0) {
1069                         if (count > (int)(runtime->buffer_size - runtime->avail - count1))
1070                                 count = runtime->buffer_size - runtime->avail - count1;
1071                         memcpy(buffer + count1, runtime->buffer, count);
1072                         result += count;
1073                 }
1074         }
1075       __skip:
1076         spin_unlock_irqrestore(&runtime->lock, flags);
1077         return result;
1078 }
1079
1080 /**
1081  * snd_rawmidi_transmit_ack - acknowledge the transmission
1082  * @substream: the rawmidi substream
1083  * @count: the tranferred count
1084  *
1085  * Advances the hardware pointer for the internal output buffer with
1086  * the given size and updates the condition.
1087  * Call after the transmission is finished.
1088  *
1089  * Returns the advanced size if successful, or a negative error code on failure.
1090  */
1091 int snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count)
1092 {
1093         unsigned long flags;
1094         struct snd_rawmidi_runtime *runtime = substream->runtime;
1095
1096         if (runtime->buffer == NULL) {
1097                 snd_printd("snd_rawmidi_transmit_ack: output is not active!!!\n");
1098                 return -EINVAL;
1099         }
1100         spin_lock_irqsave(&runtime->lock, flags);
1101         snd_assert(runtime->avail + count <= runtime->buffer_size, );
1102         runtime->hw_ptr += count;
1103         runtime->hw_ptr %= runtime->buffer_size;
1104         runtime->avail += count;
1105         substream->bytes += count;
1106         if (count > 0) {
1107                 if (runtime->drain || snd_rawmidi_ready(substream))
1108                         wake_up(&runtime->sleep);
1109         }
1110         spin_unlock_irqrestore(&runtime->lock, flags);
1111         return count;
1112 }
1113
1114 /**
1115  * snd_rawmidi_transmit - copy from the buffer to the device
1116  * @substream: the rawmidi substream
1117  * @buffer: the buffer pointer
1118  * @count: the data size to transfer
1119  *
1120  * Copies data from the buffer to the device and advances the pointer.
1121  *
1122  * Returns the copied size if successful, or a negative error code on failure.
1123  */
1124 int snd_rawmidi_transmit(struct snd_rawmidi_substream *substream,
1125                          unsigned char *buffer, int count)
1126 {
1127         count = snd_rawmidi_transmit_peek(substream, buffer, count);
1128         if (count < 0)
1129                 return count;
1130         return snd_rawmidi_transmit_ack(substream, count);
1131 }
1132
1133 static long snd_rawmidi_kernel_write1(struct snd_rawmidi_substream *substream,
1134                                       const unsigned char *buf, long count, int kernel)
1135 {
1136         unsigned long flags;
1137         long count1, result;
1138         struct snd_rawmidi_runtime *runtime = substream->runtime;
1139
1140         snd_assert(buf != NULL, return -EINVAL);
1141         snd_assert(runtime->buffer != NULL, return -EINVAL);
1142
1143         result = 0;
1144         spin_lock_irqsave(&runtime->lock, flags);
1145         if (substream->append) {
1146                 if ((long)runtime->avail < count) {
1147                         spin_unlock_irqrestore(&runtime->lock, flags);
1148                         return -EAGAIN;
1149                 }
1150         }
1151         while (count > 0 && runtime->avail > 0) {
1152                 count1 = runtime->buffer_size - runtime->appl_ptr;
1153                 if (count1 > count)
1154                         count1 = count;
1155                 if (count1 > (long)runtime->avail)
1156                         count1 = runtime->avail;
1157                 if (kernel) {
1158                         memcpy(runtime->buffer + runtime->appl_ptr, buf, count1);
1159                 } else {
1160                         spin_unlock_irqrestore(&runtime->lock, flags);
1161                         if (copy_from_user(runtime->buffer + runtime->appl_ptr,
1162                                            (char __user *)buf, count1)) {
1163                                 spin_lock_irqsave(&runtime->lock, flags);
1164                                 result = result > 0 ? result : -EFAULT;
1165                                 goto __end;
1166                         }
1167                         spin_lock_irqsave(&runtime->lock, flags);
1168                 }
1169                 runtime->appl_ptr += count1;
1170                 runtime->appl_ptr %= runtime->buffer_size;
1171                 runtime->avail -= count1;
1172                 result += count1;
1173                 buf += count1;
1174                 count -= count1;
1175         }
1176       __end:
1177         count1 = runtime->avail < runtime->buffer_size;
1178         spin_unlock_irqrestore(&runtime->lock, flags);
1179         if (count1)
1180                 snd_rawmidi_output_trigger(substream, 1);
1181         return result;
1182 }
1183
1184 long snd_rawmidi_kernel_write(struct snd_rawmidi_substream *substream,
1185                               const unsigned char *buf, long count)
1186 {
1187         return snd_rawmidi_kernel_write1(substream, buf, count, 1);
1188 }
1189
1190 static ssize_t snd_rawmidi_write(struct file *file, const char __user *buf,
1191                                  size_t count, loff_t *offset)
1192 {
1193         long result, timeout;
1194         int count1;
1195         struct snd_rawmidi_file *rfile;
1196         struct snd_rawmidi_runtime *runtime;
1197         struct snd_rawmidi_substream *substream;
1198
1199         rfile = file->private_data;
1200         substream = rfile->output;
1201         runtime = substream->runtime;
1202         /* we cannot put an atomic message to our buffer */
1203         if (substream->append && count > runtime->buffer_size)
1204                 return -EIO;
1205         result = 0;
1206         while (count > 0) {
1207                 spin_lock_irq(&runtime->lock);
1208                 while (!snd_rawmidi_ready_append(substream, count)) {
1209                         wait_queue_t wait;
1210                         if (file->f_flags & O_NONBLOCK) {
1211                                 spin_unlock_irq(&runtime->lock);
1212                                 return result > 0 ? result : -EAGAIN;
1213                         }
1214                         init_waitqueue_entry(&wait, current);
1215                         add_wait_queue(&runtime->sleep, &wait);
1216                         set_current_state(TASK_INTERRUPTIBLE);
1217                         spin_unlock_irq(&runtime->lock);
1218                         timeout = schedule_timeout(30 * HZ);
1219                         remove_wait_queue(&runtime->sleep, &wait);
1220                         if (signal_pending(current))
1221                                 return result > 0 ? result : -ERESTARTSYS;
1222                         if (!runtime->avail && !timeout)
1223                                 return result > 0 ? result : -EIO;
1224                         spin_lock_irq(&runtime->lock);
1225                 }
1226                 spin_unlock_irq(&runtime->lock);
1227                 count1 = snd_rawmidi_kernel_write1(substream,
1228                                                    (unsigned char __force *)buf,
1229                                                    count, 0);
1230                 if (count1 < 0)
1231                         return result > 0 ? result : count1;
1232                 result += count1;
1233                 buf += count1;
1234                 if ((size_t)count1 < count && (file->f_flags & O_NONBLOCK))
1235                         break;
1236                 count -= count1;
1237         }
1238         if (file->f_flags & O_SYNC) {
1239                 spin_lock_irq(&runtime->lock);
1240                 while (runtime->avail != runtime->buffer_size) {
1241                         wait_queue_t wait;
1242                         unsigned int last_avail = runtime->avail;
1243                         init_waitqueue_entry(&wait, current);
1244                         add_wait_queue(&runtime->sleep, &wait);
1245                         set_current_state(TASK_INTERRUPTIBLE);
1246                         spin_unlock_irq(&runtime->lock);
1247                         timeout = schedule_timeout(30 * HZ);
1248                         remove_wait_queue(&runtime->sleep, &wait);
1249                         if (signal_pending(current))
1250                                 return result > 0 ? result : -ERESTARTSYS;
1251                         if (runtime->avail == last_avail && !timeout)
1252                                 return result > 0 ? result : -EIO;
1253                         spin_lock_irq(&runtime->lock);
1254                 }
1255                 spin_unlock_irq(&runtime->lock);
1256         }
1257         return result;
1258 }
1259
1260 static unsigned int snd_rawmidi_poll(struct file *file, poll_table * wait)
1261 {
1262         struct snd_rawmidi_file *rfile;
1263         struct snd_rawmidi_runtime *runtime;
1264         unsigned int mask;
1265
1266         rfile = file->private_data;
1267         if (rfile->input != NULL) {
1268                 runtime = rfile->input->runtime;
1269                 snd_rawmidi_input_trigger(rfile->input, 1);
1270                 poll_wait(file, &runtime->sleep, wait);
1271         }
1272         if (rfile->output != NULL) {
1273                 runtime = rfile->output->runtime;
1274                 poll_wait(file, &runtime->sleep, wait);
1275         }
1276         mask = 0;
1277         if (rfile->input != NULL) {
1278                 if (snd_rawmidi_ready(rfile->input))
1279                         mask |= POLLIN | POLLRDNORM;
1280         }
1281         if (rfile->output != NULL) {
1282                 if (snd_rawmidi_ready(rfile->output))
1283                         mask |= POLLOUT | POLLWRNORM;
1284         }
1285         return mask;
1286 }
1287
1288 /*
1289  */
1290 #ifdef CONFIG_COMPAT
1291 #include "rawmidi_compat.c"
1292 #else
1293 #define snd_rawmidi_ioctl_compat        NULL
1294 #endif
1295
1296 /*
1297
1298  */
1299
1300 static void snd_rawmidi_proc_info_read(struct snd_info_entry *entry,
1301                                        struct snd_info_buffer *buffer)
1302 {
1303         struct snd_rawmidi *rmidi;
1304         struct snd_rawmidi_substream *substream;
1305         struct snd_rawmidi_runtime *runtime;
1306         struct list_head *list;
1307
1308         rmidi = entry->private_data;
1309         snd_iprintf(buffer, "%s\n\n", rmidi->name);
1310         down(&rmidi->open_mutex);
1311         if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_OUTPUT) {
1312                 list_for_each(list, &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams) {
1313                         substream = list_entry(list, struct snd_rawmidi_substream, list);
1314                         snd_iprintf(buffer,
1315                                     "Output %d\n"
1316                                     "  Tx bytes     : %lu\n",
1317                                     substream->number,
1318                                     (unsigned long) substream->bytes);
1319                         if (substream->opened) {
1320                                 runtime = substream->runtime;
1321                                 snd_iprintf(buffer,
1322                                     "  Mode         : %s\n"
1323                                     "  Buffer size  : %lu\n"
1324                                     "  Avail        : %lu\n",
1325                                     runtime->oss ? "OSS compatible" : "native",
1326                                     (unsigned long) runtime->buffer_size,
1327                                     (unsigned long) runtime->avail);
1328                         }
1329                 }
1330         }
1331         if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_INPUT) {
1332                 list_for_each(list, &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams) {
1333                         substream = list_entry(list, struct snd_rawmidi_substream, list);
1334                         snd_iprintf(buffer,
1335                                     "Input %d\n"
1336                                     "  Rx bytes     : %lu\n",
1337                                     substream->number,
1338                                     (unsigned long) substream->bytes);
1339                         if (substream->opened) {
1340                                 runtime = substream->runtime;
1341                                 snd_iprintf(buffer,
1342                                             "  Buffer size  : %lu\n"
1343                                             "  Avail        : %lu\n"
1344                                             "  Overruns     : %lu\n",
1345                                             (unsigned long) runtime->buffer_size,
1346                                             (unsigned long) runtime->avail,
1347                                             (unsigned long) runtime->xruns);
1348                         }
1349                 }
1350         }
1351         up(&rmidi->open_mutex);
1352 }
1353
1354 /*
1355  *  Register functions
1356  */
1357
1358 static struct file_operations snd_rawmidi_f_ops =
1359 {
1360         .owner =        THIS_MODULE,
1361         .read =         snd_rawmidi_read,
1362         .write =        snd_rawmidi_write,
1363         .open =         snd_rawmidi_open,
1364         .release =      snd_rawmidi_release,
1365         .poll =         snd_rawmidi_poll,
1366         .unlocked_ioctl =       snd_rawmidi_ioctl,
1367         .compat_ioctl = snd_rawmidi_ioctl_compat,
1368 };
1369
1370 static struct snd_minor snd_rawmidi_reg =
1371 {
1372         .comment =      "raw midi",
1373         .f_ops =        &snd_rawmidi_f_ops,
1374 };
1375
1376 static int snd_rawmidi_alloc_substreams(struct snd_rawmidi *rmidi,
1377                                         struct snd_rawmidi_str *stream,
1378                                         int direction,
1379                                         int count)
1380 {
1381         struct snd_rawmidi_substream *substream;
1382         int idx;
1383
1384         INIT_LIST_HEAD(&stream->substreams);
1385         for (idx = 0; idx < count; idx++) {
1386                 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
1387                 if (substream == NULL) {
1388                         snd_printk(KERN_ERR "rawmidi: cannot allocate substream\n");
1389                         return -ENOMEM;
1390                 }
1391                 substream->stream = direction;
1392                 substream->number = idx;
1393                 substream->rmidi = rmidi;
1394                 substream->pstr = stream;
1395                 list_add_tail(&substream->list, &stream->substreams);
1396                 stream->substream_count++;
1397         }
1398         return 0;
1399 }
1400
1401 /**
1402  * snd_rawmidi_new - create a rawmidi instance
1403  * @card: the card instance
1404  * @id: the id string
1405  * @device: the device index
1406  * @output_count: the number of output streams
1407  * @input_count: the number of input streams
1408  * @rrawmidi: the pointer to store the new rawmidi instance
1409  *
1410  * Creates a new rawmidi instance.
1411  * Use snd_rawmidi_set_ops() to set the operators to the new instance.
1412  *
1413  * Returns zero if successful, or a negative error code on failure.
1414  */
1415 int snd_rawmidi_new(struct snd_card *card, char *id, int device,
1416                     int output_count, int input_count,
1417                     struct snd_rawmidi ** rrawmidi)
1418 {
1419         struct snd_rawmidi *rmidi;
1420         int err;
1421         static struct snd_device_ops ops = {
1422                 .dev_free = snd_rawmidi_dev_free,
1423                 .dev_register = snd_rawmidi_dev_register,
1424                 .dev_disconnect = snd_rawmidi_dev_disconnect,
1425                 .dev_unregister = snd_rawmidi_dev_unregister
1426         };
1427
1428         snd_assert(rrawmidi != NULL, return -EINVAL);
1429         *rrawmidi = NULL;
1430         snd_assert(card != NULL, return -ENXIO);
1431         rmidi = kzalloc(sizeof(*rmidi), GFP_KERNEL);
1432         if (rmidi == NULL) {
1433                 snd_printk(KERN_ERR "rawmidi: cannot allocate\n");
1434                 return -ENOMEM;
1435         }
1436         rmidi->card = card;
1437         rmidi->device = device;
1438         init_MUTEX(&rmidi->open_mutex);
1439         init_waitqueue_head(&rmidi->open_wait);
1440         if (id != NULL)
1441                 strlcpy(rmidi->id, id, sizeof(rmidi->id));
1442         if ((err = snd_rawmidi_alloc_substreams(rmidi,
1443                                                 &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT],
1444                                                 SNDRV_RAWMIDI_STREAM_INPUT,
1445                                                 input_count)) < 0) {
1446                 snd_rawmidi_free(rmidi);
1447                 return err;
1448         }
1449         if ((err = snd_rawmidi_alloc_substreams(rmidi,
1450                                                 &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT],
1451                                                 SNDRV_RAWMIDI_STREAM_OUTPUT,
1452                                                 output_count)) < 0) {
1453                 snd_rawmidi_free(rmidi);
1454                 return err;
1455         }
1456         if ((err = snd_device_new(card, SNDRV_DEV_RAWMIDI, rmidi, &ops)) < 0) {
1457                 snd_rawmidi_free(rmidi);
1458                 return err;
1459         }
1460         *rrawmidi = rmidi;
1461         return 0;
1462 }
1463
1464 static void snd_rawmidi_free_substreams(struct snd_rawmidi_str *stream)
1465 {
1466         struct snd_rawmidi_substream *substream;
1467
1468         while (!list_empty(&stream->substreams)) {
1469                 substream = list_entry(stream->substreams.next, struct snd_rawmidi_substream, list);
1470                 list_del(&substream->list);
1471                 kfree(substream);
1472         }
1473 }
1474
1475 static int snd_rawmidi_free(struct snd_rawmidi *rmidi)
1476 {
1477         snd_assert(rmidi != NULL, return -ENXIO);
1478         snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT]);
1479         snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT]);
1480         if (rmidi->private_free)
1481                 rmidi->private_free(rmidi);
1482         kfree(rmidi);
1483         return 0;
1484 }
1485
1486 static int snd_rawmidi_dev_free(struct snd_device *device)
1487 {
1488         struct snd_rawmidi *rmidi = device->device_data;
1489         return snd_rawmidi_free(rmidi);
1490 }
1491
1492 #if defined(CONFIG_SND_SEQUENCER) || (defined(MODULE) && defined(CONFIG_SND_SEQUENCER_MODULE))
1493 static void snd_rawmidi_dev_seq_free(struct snd_seq_device *device)
1494 {
1495         struct snd_rawmidi *rmidi = device->private_data;
1496         rmidi->seq_dev = NULL;
1497 }
1498 #endif
1499
1500 static int snd_rawmidi_dev_register(struct snd_device *device)
1501 {
1502         int idx, err;
1503         struct snd_info_entry *entry;
1504         char name[16];
1505         struct snd_rawmidi *rmidi = device->device_data;
1506
1507         if (rmidi->device >= SNDRV_RAWMIDI_DEVICES)
1508                 return -ENOMEM;
1509         down(&register_mutex);
1510         idx = (rmidi->card->number * SNDRV_RAWMIDI_DEVICES) + rmidi->device;
1511         if (snd_rawmidi_devices[idx] != NULL) {
1512                 up(&register_mutex);
1513                 return -EBUSY;
1514         }
1515         snd_rawmidi_devices[idx] = rmidi;
1516         sprintf(name, "midiC%iD%i", rmidi->card->number, rmidi->device);
1517         if ((err = snd_register_device(SNDRV_DEVICE_TYPE_RAWMIDI,
1518                                        rmidi->card, rmidi->device,
1519                                        &snd_rawmidi_reg, name)) < 0) {
1520                 snd_printk(KERN_ERR "unable to register rawmidi device %i:%i\n", rmidi->card->number, rmidi->device);
1521                 snd_rawmidi_devices[idx] = NULL;
1522                 up(&register_mutex);
1523                 return err;
1524         }
1525         if (rmidi->ops && rmidi->ops->dev_register &&
1526             (err = rmidi->ops->dev_register(rmidi)) < 0) {
1527                 snd_unregister_device(SNDRV_DEVICE_TYPE_RAWMIDI, rmidi->card, rmidi->device);
1528                 snd_rawmidi_devices[idx] = NULL;
1529                 up(&register_mutex);
1530                 return err;
1531         }
1532 #ifdef CONFIG_SND_OSSEMUL
1533         rmidi->ossreg = 0;
1534         if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1535                 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1536                                             rmidi->card, 0, &snd_rawmidi_reg, name) < 0) {
1537                         snd_printk(KERN_ERR "unable to register OSS rawmidi device %i:%i\n", rmidi->card->number, 0);
1538                 } else {
1539                         rmidi->ossreg++;
1540 #ifdef SNDRV_OSS_INFO_DEV_MIDI
1541                         snd_oss_info_register(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number, rmidi->name);
1542 #endif
1543                 }
1544         }
1545         if ((int)rmidi->device == amidi_map[rmidi->card->number]) {
1546                 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1547                                             rmidi->card, 1, &snd_rawmidi_reg, name) < 0) {
1548                         snd_printk(KERN_ERR "unable to register OSS rawmidi device %i:%i\n", rmidi->card->number, 1);
1549                 } else {
1550                         rmidi->ossreg++;
1551                 }
1552         }
1553 #endif /* CONFIG_SND_OSSEMUL */
1554         up(&register_mutex);
1555         sprintf(name, "midi%d", rmidi->device);
1556         entry = snd_info_create_card_entry(rmidi->card, name, rmidi->card->proc_root);
1557         if (entry) {
1558                 entry->private_data = rmidi;
1559                 entry->c.text.read_size = 1024;
1560                 entry->c.text.read = snd_rawmidi_proc_info_read;
1561                 if (snd_info_register(entry) < 0) {
1562                         snd_info_free_entry(entry);
1563                         entry = NULL;
1564                 }
1565         }
1566         rmidi->proc_entry = entry;
1567 #if defined(CONFIG_SND_SEQUENCER) || (defined(MODULE) && defined(CONFIG_SND_SEQUENCER_MODULE))
1568         if (!rmidi->ops || !rmidi->ops->dev_register) { /* own registration mechanism */
1569                 if (snd_seq_device_new(rmidi->card, rmidi->device, SNDRV_SEQ_DEV_ID_MIDISYNTH, 0, &rmidi->seq_dev) >= 0) {
1570                         rmidi->seq_dev->private_data = rmidi;
1571                         rmidi->seq_dev->private_free = snd_rawmidi_dev_seq_free;
1572                         sprintf(rmidi->seq_dev->name, "MIDI %d-%d", rmidi->card->number, rmidi->device);
1573                         snd_device_register(rmidi->card, rmidi->seq_dev);
1574                 }
1575         }
1576 #endif
1577         return 0;
1578 }
1579
1580 static int snd_rawmidi_dev_disconnect(struct snd_device *device)
1581 {
1582         struct snd_rawmidi *rmidi = device->device_data;
1583         int idx;
1584
1585         down(&register_mutex);
1586         idx = (rmidi->card->number * SNDRV_RAWMIDI_DEVICES) + rmidi->device;
1587         snd_rawmidi_devices[idx] = NULL;
1588         up(&register_mutex);
1589         return 0;
1590 }
1591
1592 static int snd_rawmidi_dev_unregister(struct snd_device *device)
1593 {
1594         int idx;
1595         struct snd_rawmidi *rmidi = device->device_data;
1596
1597         snd_assert(rmidi != NULL, return -ENXIO);
1598         down(&register_mutex);
1599         idx = (rmidi->card->number * SNDRV_RAWMIDI_DEVICES) + rmidi->device;
1600         snd_rawmidi_devices[idx] = NULL;
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         up(&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);
1700 EXPORT_SYMBOL(snd_rawmidi_info_select);
1701 EXPORT_SYMBOL(snd_rawmidi_kernel_open);
1702 EXPORT_SYMBOL(snd_rawmidi_kernel_release);
1703 EXPORT_SYMBOL(snd_rawmidi_kernel_read);
1704 EXPORT_SYMBOL(snd_rawmidi_kernel_write);