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 (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(list, &pstr->substreams) {
 584                 substream = list_entry(list, struct snd_rawmidi_substream, list);
 585                 if ((unsigned int)substream->number == info->subdevice)
 586                         return snd_rawmidi_info(substream, info);
 587         }
 588         return -ENXIO;
 589 }
 590
 591 static int snd_rawmidi_info_select_user(struct snd_card *card,
 592                                         struct snd_rawmidi_info __user *_info)
 593 {
 594         int err;
 595         struct snd_rawmidi_info info;
 596         if (get_user(info.device, &_info->device))
 597                 return -EFAULT;
 598         if (get_user(info.stream, &_info->stream))
 599                 return -EFAULT;
 600         if (get_user(info.subdevice, &_info->subdevice))
 601                 return -EFAULT;
 602         if ((err = snd_rawmidi_info_select(card, &info)) < 0)
 603                 return err;
 604         if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
 605                 return -EFAULT;
 606         return 0;
 607 }
 608
 609 int snd_rawmidi_output_params(struct snd_rawmidi_substream *substream,
 610                               struct snd_rawmidi_params * params)
 611 {
 612         char *newbuf;
 613         struct snd_rawmidi_runtime *runtime = substream->runtime;
 614
 615         if (substream->append && substream->use_count > 1)
 616                 return -EBUSY;
 617         snd_rawmidi_drain_output(substream);
 618         if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L) {
 619                 return -EINVAL;
 620         }
 621         if (params->avail_min < 1 || params->avail_min > params->buffer_size) {
 622                 return -EINVAL;
 623         }
 624         if (params->buffer_size != runtime->buffer_size) {
 625                 if ((newbuf = (char *) kmalloc(params->buffer_size, GFP_KERNEL)) == NULL)
 626                         return -ENOMEM;
 627                 kfree(runtime->buffer);
 628                 runtime->buffer = newbuf;
 629                 runtime->buffer_size = params->buffer_size;
 630         }
 631         runtime->avail_min = params->avail_min;
 632         substream->active_sensing = !params->no_active_sensing;
 633         return 0;
 634 }
 635
 636 int snd_rawmidi_input_params(struct snd_rawmidi_substream *substream,
 637                              struct snd_rawmidi_params * params)
 638 {
 639         char *newbuf;
 640         struct snd_rawmidi_runtime *runtime = substream->runtime;
 641
 642         snd_rawmidi_drain_input(substream);
 643         if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L) {
 644                 return -EINVAL;
 645         }
 646         if (params->avail_min < 1 || params->avail_min > params->buffer_size) {
 647                 return -EINVAL;
 648         }
 649         if (params->buffer_size != runtime->buffer_size) {
 650                 if ((newbuf = (char *) kmalloc(params->buffer_size, GFP_KERNEL)) == NULL)
 651                         return -ENOMEM;
 652                 kfree(runtime->buffer);
 653                 runtime->buffer = newbuf;
 654                 runtime->buffer_size = params->buffer_size;
 655         }
 656         runtime->avail_min = params->avail_min;
 657         return 0;
 658 }
 659
 660 static int snd_rawmidi_output_status(struct snd_rawmidi_substream *substream,
 661                                      struct snd_rawmidi_status * status)
 662 {
 663         struct snd_rawmidi_runtime *runtime = substream->runtime;
 664
 665         memset(status, 0, sizeof(*status));
 666         status->stream = SNDRV_RAWMIDI_STREAM_OUTPUT;
 667         spin_lock_irq(&runtime->lock);
 668         status->avail = runtime->avail;
 669         spin_unlock_irq(&runtime->lock);
 670         return 0;
 671 }
 672
 673 static int snd_rawmidi_input_status(struct snd_rawmidi_substream *substream,
 674                                     struct snd_rawmidi_status * status)
 675 {
 676         struct snd_rawmidi_runtime *runtime = substream->runtime;
 677
 678         memset(status, 0, sizeof(*status));
 679         status->stream = SNDRV_RAWMIDI_STREAM_INPUT;
 680         spin_lock_irq(&runtime->lock);
 681         status->avail = runtime->avail;
 682         status->xruns = runtime->xruns;
 683         runtime->xruns = 0;
 684         spin_unlock_irq(&runtime->lock);
 685         return 0;
 686 }
 687
 688 static long snd_rawmidi_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 689 {
 690         struct snd_rawmidi_file *rfile;
 691         void __user *argp = (void __user *)arg;
 692
 693         rfile = file->private_data;
 694         if (((cmd >> 8) & 0xff) != 'W')
 695                 return -ENOTTY;
 696         switch (cmd) {
 697         case SNDRV_RAWMIDI_IOCTL_PVERSION:
 698                 return put_user(SNDRV_RAWMIDI_VERSION, (int __user *)argp) ? -EFAULT : 0;
 699         case SNDRV_RAWMIDI_IOCTL_INFO:
 700         {
 701                 int stream;
 702                 struct snd_rawmidi_info __user *info = argp;
 703                 if (get_user(stream, &info->stream))
 704                         return -EFAULT;
 705                 switch (stream) {
 706                 case SNDRV_RAWMIDI_STREAM_INPUT:
 707                         return snd_rawmidi_info_user(rfile->input, info);
 708                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
 709                         return snd_rawmidi_info_user(rfile->output, info);
 710                 default:
 711                         return -EINVAL;
 712                 }
 713         }
 714         case SNDRV_RAWMIDI_IOCTL_PARAMS:
 715         {
 716                 struct snd_rawmidi_params params;
 717                 if (copy_from_user(&params, argp, sizeof(struct snd_rawmidi_params)))
 718                         return -EFAULT;
 719                 switch (params.stream) {
 720                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
 721                         if (rfile->output == NULL)
 722                                 return -EINVAL;
 723                         return snd_rawmidi_output_params(rfile->output, &params);
 724                 case SNDRV_RAWMIDI_STREAM_INPUT:
 725                         if (rfile->input == NULL)
 726                                 return -EINVAL;
 727                         return snd_rawmidi_input_params(rfile->input, &params);
 728                 default:
 729                         return -EINVAL;
 730                 }
 731         }
 732         case SNDRV_RAWMIDI_IOCTL_STATUS:
 733         {
 734                 int err = 0;
 735                 struct snd_rawmidi_status status;
 736                 if (copy_from_user(&status, argp, sizeof(struct snd_rawmidi_status)))
 737                         return -EFAULT;
 738                 switch (status.stream) {
 739                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
 740                         if (rfile->output == NULL)
 741                                 return -EINVAL;
 742                         err = snd_rawmidi_output_status(rfile->output, &status);
 743                         break;
 744                 case SNDRV_RAWMIDI_STREAM_INPUT:
 745                         if (rfile->input == NULL)
 746                                 return -EINVAL;
 747                         err = snd_rawmidi_input_status(rfile->input, &status);
 748                         break;
 749                 default:
 750                         return -EINVAL;
 751                 }
 752                 if (err < 0)
 753                         return err;
 754                 if (copy_to_user(argp, &status, sizeof(struct snd_rawmidi_status)))
 755                         return -EFAULT;
 756                 return 0;
 757         }
 758         case SNDRV_RAWMIDI_IOCTL_DROP:
 759         {
 760                 int val;
 761                 if (get_user(val, (int __user *) argp))
 762                         return -EFAULT;
 763                 switch (val) {
 764                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
 765                         if (rfile->output == NULL)
 766                                 return -EINVAL;
 767                         return snd_rawmidi_drop_output(rfile->output);
 768                 default:
 769                         return -EINVAL;
 770                 }
 771         }
 772         case SNDRV_RAWMIDI_IOCTL_DRAIN:
 773         {
 774                 int val;
 775                 if (get_user(val, (int __user *) argp))
 776                         return -EFAULT;
 777                 switch (val) {
 778                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
 779                         if (rfile->output == NULL)
 780                                 return -EINVAL;
 781                         return snd_rawmidi_drain_output(rfile->output);
 782                 case SNDRV_RAWMIDI_STREAM_INPUT:
 783                         if (rfile->input == NULL)
 784                                 return -EINVAL;
 785                         return snd_rawmidi_drain_input(rfile->input);
 786                 default:
 787                         return -EINVAL;
 788                 }
 789         }
 790 #ifdef CONFIG_SND_DEBUG
 791         default:
 792                 snd_printk(KERN_WARNING "rawmidi: unknown command = 0x%x\n", cmd);
 793 #endif
 794         }
 795         return -ENOTTY;
 796 }
 797
 798 static int snd_rawmidi_control_ioctl(struct snd_card *card,
 799                                      struct snd_ctl_file *control,
 800                                      unsigned int cmd,
 801                                      unsigned long arg)
 802 {
 803         void __user *argp = (void __user *)arg;
 804         unsigned int tmp;
 805
 806         tmp = card->number * SNDRV_RAWMIDI_DEVICES;
 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                 device = device < 0 ? 0 : device + 1;
 815                 while (device < SNDRV_RAWMIDI_DEVICES) {
 816                         if (snd_rawmidi_devices[tmp + device])
 817                                 break;
 818                         device++;
 819                 }
 820                 if (device == SNDRV_RAWMIDI_DEVICES)
 821                         device = -1;
 822                 if (put_user(device, (int __user *)argp))
 823                         return -EFAULT;
 824                 return 0;
 825         }
 826         case SNDRV_CTL_IOCTL_RAWMIDI_PREFER_SUBDEVICE:
 827         {
 828                 int val;
 829
 830                 if (get_user(val, (int __user *)argp))
 831                         return -EFAULT;
 832                 control->prefer_rawmidi_subdevice = val;
 833                 return 0;
 834         }
 835         case SNDRV_CTL_IOCTL_RAWMIDI_INFO:
 836                 return snd_rawmidi_info_select_user(card, argp);
 837         }
 838         return -ENOIOCTLCMD;
 839 }
 840
 841 /**
 842  * snd_rawmidi_receive - receive the input data from the device
 843  * @substream: the rawmidi substream
 844  * @buffer: the buffer pointer
 845  * @count: the data size to read
 846  *
 847  * Reads the data from the internal buffer.
 848  *
 849  * Returns the size of read data, or a negative error code on failure.
 850  */
 851 int snd_rawmidi_receive(struct snd_rawmidi_substream *substream,
 852                         const unsigned char *buffer, int count)
 853 {
 854         unsigned long flags;
 855         int result = 0, count1;
 856         struct snd_rawmidi_runtime *runtime = substream->runtime;
 857
 858         if (runtime->buffer == NULL) {
 859                 snd_printd("snd_rawmidi_receive: input is not active!!!\n");
 860                 return -EINVAL;
 861         }
 862         spin_lock_irqsave(&runtime->lock, flags);
 863         if (count == 1) {       /* special case, faster code */
 864                 substream->bytes++;
 865                 if (runtime->avail < runtime->buffer_size) {
 866                         runtime->buffer[runtime->hw_ptr++] = buffer[0];
 867                         runtime->hw_ptr %= runtime->buffer_size;
 868                         runtime->avail++;
 869                         result++;
 870                 } else {
 871                         runtime->xruns++;
 872                 }
 873         } else {
 874                 substream->bytes += count;
 875                 count1 = runtime->buffer_size - runtime->hw_ptr;
 876                 if (count1 > count)
 877                         count1 = count;
 878                 if (count1 > (int)(runtime->buffer_size - runtime->avail))
 879                         count1 = runtime->buffer_size - runtime->avail;
 880                 memcpy(runtime->buffer + runtime->hw_ptr, buffer, count1);
 881                 runtime->hw_ptr += count1;
 882                 runtime->hw_ptr %= runtime->buffer_size;
 883                 runtime->avail += count1;
 884                 count -= count1;
 885                 result += count1;
 886                 if (count > 0) {
 887                         buffer += count1;
 888                         count1 = count;
 889                         if (count1 > (int)(runtime->buffer_size - runtime->avail)) {
 890                                 count1 = runtime->buffer_size - runtime->avail;
 891                                 runtime->xruns += count - count1;
 892                         }
 893                         if (count1 > 0) {
 894                                 memcpy(runtime->buffer, buffer, count1);
 895                                 runtime->hw_ptr = count1;
 896                                 runtime->avail += count1;
 897                                 result += count1;
 898                         }
 899                 }
 900         }
 901         if (result > 0) {
 902                 if (runtime->event)
 903                         tasklet_hi_schedule(&runtime->tasklet);
 904                 else if (snd_rawmidi_ready(substream))
 905                         wake_up(&runtime->sleep);
 906         }
 907         spin_unlock_irqrestore(&runtime->lock, flags);
 908         return result;
 909 }
 910
 911 static long snd_rawmidi_kernel_read1(struct snd_rawmidi_substream *substream,
 912                                      unsigned char *buf, long count, int kernel)
 913 {
 914         unsigned long flags;
 915         long result = 0, count1;
 916         struct snd_rawmidi_runtime *runtime = substream->runtime;
 917
 918         while (count > 0 && runtime->avail) {
 919                 count1 = runtime->buffer_size - runtime->appl_ptr;
 920                 if (count1 > count)
 921                         count1 = count;
 922                 spin_lock_irqsave(&runtime->lock, flags);
 923                 if (count1 > (int)runtime->avail)
 924                         count1 = runtime->avail;
 925                 if (kernel) {
 926                         memcpy(buf + result, runtime->buffer + runtime->appl_ptr, count1);
 927                 } else {
 928                         spin_unlock_irqrestore(&runtime->lock, flags);
 929                         if (copy_to_user((char __user *)buf + result,
 930                                          runtime->buffer + runtime->appl_ptr, count1)) {
 931                                 return result > 0 ? result : -EFAULT;
 932                         }
 933                         spin_lock_irqsave(&runtime->lock, flags);
 934                 }
 935                 runtime->appl_ptr += count1;
 936                 runtime->appl_ptr %= runtime->buffer_size;
 937                 runtime->avail -= count1;
 938                 spin_unlock_irqrestore(&runtime->lock, flags);
 939                 result += count1;
 940                 count -= count1;
 941         }
 942         return result;
 943 }
 944
 945 long snd_rawmidi_kernel_read(struct snd_rawmidi_substream *substream,
 946                              unsigned char *buf, long count)
 947 {
 948         snd_rawmidi_input_trigger(substream, 1);
 949         return snd_rawmidi_kernel_read1(substream, buf, count, 1);
 950 }
 951
 952 static ssize_t snd_rawmidi_read(struct file *file, char __user *buf, size_t count,
 953                                 loff_t *offset)
 954 {
 955         long result;
 956         int count1;
 957         struct snd_rawmidi_file *rfile;
 958         struct snd_rawmidi_substream *substream;
 959         struct snd_rawmidi_runtime *runtime;
 960
 961         rfile = file->private_data;
 962         substream = rfile->input;
 963         if (substream == NULL)
 964                 return -EIO;
 965         runtime = substream->runtime;
 966         snd_rawmidi_input_trigger(substream, 1);
 967         result = 0;
 968         while (count > 0) {
 969                 spin_lock_irq(&runtime->lock);
 970                 while (!snd_rawmidi_ready(substream)) {
 971                         wait_queue_t wait;
 972                         if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
 973                                 spin_unlock_irq(&runtime->lock);
 974                                 return result > 0 ? result : -EAGAIN;
 975                         }
 976                         init_waitqueue_entry(&wait, current);
 977                         add_wait_queue(&runtime->sleep, &wait);
 978                         set_current_state(TASK_INTERRUPTIBLE);
 979                         spin_unlock_irq(&runtime->lock);
 980                         schedule();
 981                         remove_wait_queue(&runtime->sleep, &wait);
 982                         if (signal_pending(current))
 983                                 return result > 0 ? result : -ERESTARTSYS;
 984                         if (!runtime->avail)
 985                                 return result > 0 ? result : -EIO;
 986                         spin_lock_irq(&runtime->lock);
 987                 }
 988                 spin_unlock_irq(&runtime->lock);
 989                 count1 = snd_rawmidi_kernel_read1(substream,
 990                                                   (unsigned char __force *)buf,
 991                                                   count, 0);
 992                 if (count1 < 0)
 993                         return result > 0 ? result : count1;
 994                 result += count1;
 995                 buf += count1;
 996                 count -= count1;
 997         }
 998         return result;
 999 }
1000
1001 /**
1002  * snd_rawmidi_transmit_empty - check whether the output buffer is empty
1003  * @substream: the rawmidi substream
1004  *
1005  * Returns 1 if the internal output buffer is empty, 0 if not.
1006  */
1007 int snd_rawmidi_transmit_empty(struct snd_rawmidi_substream *substream)
1008 {
1009         struct snd_rawmidi_runtime *runtime = substream->runtime;
1010         int result;
1011         unsigned long flags;
1012
1013         if (runtime->buffer == NULL) {
1014                 snd_printd("snd_rawmidi_transmit_empty: output is not active!!!\n");
1015                 return 1;
1016         }
1017         spin_lock_irqsave(&runtime->lock, flags);
1018         result = runtime->avail >= runtime->buffer_size;
1019         spin_unlock_irqrestore(&runtime->lock, flags);
1020         return result;
1021 }
1022
1023 /**
1024  * snd_rawmidi_transmit_peek - copy data from the internal buffer
1025  * @substream: the rawmidi substream
1026  * @buffer: the buffer pointer
1027  * @count: data size to transfer
1028  *
1029  * Copies data from the internal output buffer to the given buffer.
1030  *
1031  * Call this in the interrupt handler when the midi output is ready,
1032  * and call snd_rawmidi_transmit_ack() after the transmission is
1033  * finished.
1034  *
1035  * Returns the size of copied data, or a negative error code on failure.
1036  */
1037 int snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
1038                               unsigned char *buffer, int count)
1039 {
1040         unsigned long flags;
1041         int result, count1;
1042         struct snd_rawmidi_runtime *runtime = substream->runtime;
1043
1044         if (runtime->buffer == NULL) {
1045                 snd_printd("snd_rawmidi_transmit_peek: output is not active!!!\n");
1046                 return -EINVAL;
1047         }
1048         result = 0;
1049         spin_lock_irqsave(&runtime->lock, flags);
1050         if (runtime->avail >= runtime->buffer_size) {
1051                 /* warning: lowlevel layer MUST trigger down the hardware */
1052                 goto __skip;
1053         }
1054         if (count == 1) {       /* special case, faster code */
1055                 *buffer = runtime->buffer[runtime->hw_ptr];
1056                 result++;
1057         } else {
1058                 count1 = runtime->buffer_size - runtime->hw_ptr;
1059                 if (count1 > count)
1060                         count1 = count;
1061                 if (count1 > (int)(runtime->buffer_size - runtime->avail))
1062                         count1 = runtime->buffer_size - runtime->avail;
1063                 memcpy(buffer, runtime->buffer + runtime->hw_ptr, count1);
1064                 count -= count1;
1065                 result += count1;
1066                 if (count > 0) {
1067                         if (count > (int)(runtime->buffer_size - runtime->avail - count1))
1068                                 count = runtime->buffer_size - runtime->avail - count1;
1069                         memcpy(buffer + count1, runtime->buffer, count);
1070                         result += count;
1071                 }
1072         }
1073       __skip:
1074         spin_unlock_irqrestore(&runtime->lock, flags);
1075         return result;
1076 }
1077
1078 /**
1079  * snd_rawmidi_transmit_ack - acknowledge the transmission
1080  * @substream: the rawmidi substream
1081  * @count: the tranferred count
1082  *
1083  * Advances the hardware pointer for the internal output buffer with
1084  * the given size and updates the condition.
1085  * Call after the transmission is finished.
1086  *
1087  * Returns the advanced size if successful, or a negative error code on failure.
1088  */
1089 int snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count)
1090 {
1091         unsigned long flags;
1092         struct snd_rawmidi_runtime *runtime = substream->runtime;
1093
1094         if (runtime->buffer == NULL) {
1095                 snd_printd("snd_rawmidi_transmit_ack: output is not active!!!\n");
1096                 return -EINVAL;
1097         }
1098         spin_lock_irqsave(&runtime->lock, flags);
1099         snd_assert(runtime->avail + count <= runtime->buffer_size, );
1100         runtime->hw_ptr += count;
1101         runtime->hw_ptr %= runtime->buffer_size;
1102         runtime->avail += count;
1103         substream->bytes += count;
1104         if (count > 0) {
1105                 if (runtime->drain || snd_rawmidi_ready(substream))
1106                         wake_up(&runtime->sleep);
1107         }
1108         spin_unlock_irqrestore(&runtime->lock, flags);
1109         return count;
1110 }
1111
1112 /**
1113  * snd_rawmidi_transmit - copy from the buffer to the device
1114  * @substream: the rawmidi substream
1115  * @buffer: the buffer pointer
1116  * @count: the data size to transfer
1117  *
1118  * Copies data from the buffer to the device and advances the pointer.
1119  *
1120  * Returns the copied size if successful, or a negative error code on failure.
1121  */
1122 int snd_rawmidi_transmit(struct snd_rawmidi_substream *substream,
1123                          unsigned char *buffer, int count)
1124 {
1125         count = snd_rawmidi_transmit_peek(substream, buffer, count);
1126         if (count < 0)
1127                 return count;
1128         return snd_rawmidi_transmit_ack(substream, count);
1129 }
1130
1131 static long snd_rawmidi_kernel_write1(struct snd_rawmidi_substream *substream,
1132                                       const unsigned char *buf, long count, int kernel)
1133 {
1134         unsigned long flags;
1135         long count1, result;
1136         struct snd_rawmidi_runtime *runtime = substream->runtime;
1137
1138         snd_assert(buf != NULL, return -EINVAL);
1139         snd_assert(runtime->buffer != NULL, return -EINVAL);
1140
1141         result = 0;
1142         spin_lock_irqsave(&runtime->lock, flags);
1143         if (substream->append) {
1144                 if ((long)runtime->avail < count) {
1145                         spin_unlock_irqrestore(&runtime->lock, flags);
1146                         return -EAGAIN;
1147                 }
1148         }
1149         while (count > 0 && runtime->avail > 0) {
1150                 count1 = runtime->buffer_size - runtime->appl_ptr;
1151                 if (count1 > count)
1152                         count1 = count;
1153                 if (count1 > (long)runtime->avail)
1154                         count1 = runtime->avail;
1155                 if (kernel) {
1156                         memcpy(runtime->buffer + runtime->appl_ptr, buf, count1);
1157                 } else {
1158                         spin_unlock_irqrestore(&runtime->lock, flags);
1159                         if (copy_from_user(runtime->buffer + runtime->appl_ptr,
1160                                            (char __user *)buf, count1)) {
1161                                 spin_lock_irqsave(&runtime->lock, flags);
1162                                 result = result > 0 ? result : -EFAULT;
1163                                 goto __end;
1164                         }
1165                         spin_lock_irqsave(&runtime->lock, flags);
1166                 }
1167                 runtime->appl_ptr += count1;
1168                 runtime->appl_ptr %= runtime->buffer_size;
1169                 runtime->avail -= count1;
1170                 result += count1;
1171                 buf += count1;
1172                 count -= count1;
1173         }
1174       __end:
1175         count1 = runtime->avail < runtime->buffer_size;
1176         spin_unlock_irqrestore(&runtime->lock, flags);
1177         if (count1)
1178                 snd_rawmidi_output_trigger(substream, 1);
1179         return result;
1180 }
1181
1182 long snd_rawmidi_kernel_write(struct snd_rawmidi_substream *substream,
1183                               const unsigned char *buf, long count)
1184 {
1185         return snd_rawmidi_kernel_write1(substream, buf, count, 1);
1186 }
1187
1188 static ssize_t snd_rawmidi_write(struct file *file, const char __user *buf,
1189                                  size_t count, loff_t *offset)
1190 {
1191         long result, timeout;
1192         int count1;
1193         struct snd_rawmidi_file *rfile;
1194         struct snd_rawmidi_runtime *runtime;
1195         struct snd_rawmidi_substream *substream;
1196
1197         rfile = file->private_data;
1198         substream = rfile->output;
1199         runtime = substream->runtime;
1200         /* we cannot put an atomic message to our buffer */
1201         if (substream->append && count > runtime->buffer_size)
1202                 return -EIO;
1203         result = 0;
1204         while (count > 0) {
1205                 spin_lock_irq(&runtime->lock);
1206                 while (!snd_rawmidi_ready_append(substream, count)) {
1207                         wait_queue_t wait;
1208                         if (file->f_flags & O_NONBLOCK) {
1209                                 spin_unlock_irq(&runtime->lock);
1210                                 return result > 0 ? result : -EAGAIN;
1211                         }
1212                         init_waitqueue_entry(&wait, current);
1213                         add_wait_queue(&runtime->sleep, &wait);
1214                         set_current_state(TASK_INTERRUPTIBLE);
1215                         spin_unlock_irq(&runtime->lock);
1216                         timeout = schedule_timeout(30 * HZ);
1217                         remove_wait_queue(&runtime->sleep, &wait);
1218                         if (signal_pending(current))
1219                                 return result > 0 ? result : -ERESTARTSYS;
1220                         if (!runtime->avail && !timeout)
1221                                 return result > 0 ? result : -EIO;
1222                         spin_lock_irq(&runtime->lock);
1223                 }
1224                 spin_unlock_irq(&runtime->lock);
1225                 count1 = snd_rawmidi_kernel_write1(substream,
1226                                                    (unsigned char __force *)buf,
1227                                                    count, 0);
1228                 if (count1 < 0)
1229                         return result > 0 ? result : count1;
1230                 result += count1;
1231                 buf += count1;
1232                 if ((size_t)count1 < count && (file->f_flags & O_NONBLOCK))
1233                         break;
1234                 count -= count1;
1235         }
1236         if (file->f_flags & O_SYNC) {
1237                 spin_lock_irq(&runtime->lock);
1238                 while (runtime->avail != runtime->buffer_size) {
1239                         wait_queue_t wait;
1240                         unsigned int last_avail = runtime->avail;
1241                         init_waitqueue_entry(&wait, current);
1242                         add_wait_queue(&runtime->sleep, &wait);
1243                         set_current_state(TASK_INTERRUPTIBLE);
1244                         spin_unlock_irq(&runtime->lock);
1245                         timeout = schedule_timeout(30 * HZ);
1246                         remove_wait_queue(&runtime->sleep, &wait);
1247                         if (signal_pending(current))
1248                                 return result > 0 ? result : -ERESTARTSYS;
1249                         if (runtime->avail == last_avail && !timeout)
1250                                 return result > 0 ? result : -EIO;
1251                         spin_lock_irq(&runtime->lock);
1252                 }
1253                 spin_unlock_irq(&runtime->lock);
1254         }
1255         return result;
1256 }
1257
1258 static unsigned int snd_rawmidi_poll(struct file *file, poll_table * wait)
1259 {
1260         struct snd_rawmidi_file *rfile;
1261         struct snd_rawmidi_runtime *runtime;
1262         unsigned int mask;
1263
1264         rfile = file->private_data;
1265         if (rfile->input != NULL) {
1266                 runtime = rfile->input->runtime;
1267                 snd_rawmidi_input_trigger(rfile->input, 1);
1268                 poll_wait(file, &runtime->sleep, wait);
1269         }
1270         if (rfile->output != NULL) {
1271                 runtime = rfile->output->runtime;
1272                 poll_wait(file, &runtime->sleep, wait);
1273         }
1274         mask = 0;
1275         if (rfile->input != NULL) {
1276                 if (snd_rawmidi_ready(rfile->input))
1277                         mask |= POLLIN | POLLRDNORM;
1278         }
1279         if (rfile->output != NULL) {
1280                 if (snd_rawmidi_ready(rfile->output))
1281                         mask |= POLLOUT | POLLWRNORM;
1282         }
1283         return mask;
1284 }
1285
1286 /*
1287  */
1288 #ifdef CONFIG_COMPAT
1289 #include "rawmidi_compat.c"
1290 #else
1291 #define snd_rawmidi_ioctl_compat        NULL
1292 #endif
1293
1294 /*
1295
1296  */
1297
1298 static void snd_rawmidi_proc_info_read(struct snd_info_entry *entry,
1299                                        struct snd_info_buffer *buffer)
1300 {
1301         struct snd_rawmidi *rmidi;
1302         struct snd_rawmidi_substream *substream;
1303         struct snd_rawmidi_runtime *runtime;
1304         struct list_head *list;
1305
1306         rmidi = entry->private_data;
1307         snd_iprintf(buffer, "%s\n\n", rmidi->name);
1308         down(&rmidi->open_mutex);
1309         if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_OUTPUT) {
1310                 list_for_each(list, &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams) {
1311                         substream = list_entry(list, struct snd_rawmidi_substream, list);
1312                         snd_iprintf(buffer,
1313                                     "Output %d\n"
1314                                     "  Tx bytes     : %lu\n",
1315                                     substream->number,
1316                                     (unsigned long) substream->bytes);
1317                         if (substream->opened) {
1318                                 runtime = substream->runtime;
1319                                 snd_iprintf(buffer,
1320                                     "  Mode         : %s\n"
1321                                     "  Buffer size  : %lu\n"
1322                                     "  Avail        : %lu\n",
1323                                     runtime->oss ? "OSS compatible" : "native",
1324                                     (unsigned long) runtime->buffer_size,
1325                                     (unsigned long) runtime->avail);
1326                         }
1327                 }
1328         }
1329         if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_INPUT) {
1330                 list_for_each(list, &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams) {
1331                         substream = list_entry(list, struct snd_rawmidi_substream, list);
1332                         snd_iprintf(buffer,
1333                                     "Input %d\n"
1334                                     "  Rx bytes     : %lu\n",
1335                                     substream->number,
1336                                     (unsigned long) substream->bytes);
1337                         if (substream->opened) {
1338                                 runtime = substream->runtime;
1339                                 snd_iprintf(buffer,
1340                                             "  Buffer size  : %lu\n"
1341                                             "  Avail        : %lu\n"
1342                                             "  Overruns     : %lu\n",
1343                                             (unsigned long) runtime->buffer_size,
1344                                             (unsigned long) runtime->avail,
1345                                             (unsigned long) runtime->xruns);
1346                         }
1347                 }
1348         }
1349         up(&rmidi->open_mutex);
1350 }
1351
1352 /*
1353  *  Register functions
1354  */
1355
1356 static struct file_operations snd_rawmidi_f_ops =
1357 {
1358         .owner =        THIS_MODULE,
1359         .read =         snd_rawmidi_read,
1360         .write =        snd_rawmidi_write,
1361         .open =         snd_rawmidi_open,
1362         .release =      snd_rawmidi_release,
1363         .poll =         snd_rawmidi_poll,
1364         .unlocked_ioctl =       snd_rawmidi_ioctl,
1365         .compat_ioctl = snd_rawmidi_ioctl_compat,
1366 };
1367
1368 static struct snd_minor snd_rawmidi_reg =
1369 {
1370         .comment =      "raw midi",
1371         .f_ops =        &snd_rawmidi_f_ops,
1372 };
1373
1374 static int snd_rawmidi_alloc_substreams(struct snd_rawmidi *rmidi,
1375                                         struct snd_rawmidi_str *stream,
1376                                         int direction,
1377                                         int count)
1378 {
1379         struct snd_rawmidi_substream *substream;
1380         int idx;
1381
1382         INIT_LIST_HEAD(&stream->substreams);
1383         for (idx = 0; idx < count; idx++) {
1384                 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
1385                 if (substream == NULL)
1386                         return -ENOMEM;
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                 .dev_unregister = snd_rawmidi_dev_unregister
1422         };
1423
1424         snd_assert(rrawmidi != NULL, return -EINVAL);
1425         *rrawmidi = NULL;
1426         snd_assert(card != NULL, return -ENXIO);
1427         rmidi = kzalloc(sizeof(*rmidi), GFP_KERNEL);
1428         if (rmidi == NULL)
1429                 return -ENOMEM;
1430         rmidi->card = card;
1431         rmidi->device = device;
1432         init_MUTEX(&rmidi->open_mutex);
1433         init_waitqueue_head(&rmidi->open_wait);
1434         if (id != NULL)
1435                 strlcpy(rmidi->id, id, sizeof(rmidi->id));
1436         if ((err = snd_rawmidi_alloc_substreams(rmidi, &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT], SNDRV_RAWMIDI_STREAM_INPUT, input_count)) < 0) {
1437                 snd_rawmidi_free(rmidi);
1438                 return err;
1439         }
1440         if ((err = snd_rawmidi_alloc_substreams(rmidi, &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT], SNDRV_RAWMIDI_STREAM_OUTPUT, output_count)) < 0) {
1441                 snd_rawmidi_free(rmidi);
1442                 return err;
1443         }
1444         if ((err = snd_device_new(card, SNDRV_DEV_RAWMIDI, rmidi, &ops)) < 0) {
1445                 snd_rawmidi_free(rmidi);
1446                 return err;
1447         }
1448         *rrawmidi = rmidi;
1449         return 0;
1450 }
1451
1452 static void snd_rawmidi_free_substreams(struct snd_rawmidi_str *stream)
1453 {
1454         struct snd_rawmidi_substream *substream;
1455
1456         while (!list_empty(&stream->substreams)) {
1457                 substream = list_entry(stream->substreams.next, struct snd_rawmidi_substream, list);
1458                 list_del(&substream->list);
1459                 kfree(substream);
1460         }
1461 }
1462
1463 static int snd_rawmidi_free(struct snd_rawmidi *rmidi)
1464 {
1465         snd_assert(rmidi != NULL, return -ENXIO);
1466         snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT]);
1467         snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT]);
1468         if (rmidi->private_free)
1469                 rmidi->private_free(rmidi);
1470         kfree(rmidi);
1471         return 0;
1472 }
1473
1474 static int snd_rawmidi_dev_free(struct snd_device *device)
1475 {
1476         struct snd_rawmidi *rmidi = device->device_data;
1477         return snd_rawmidi_free(rmidi);
1478 }
1479
1480 #if defined(CONFIG_SND_SEQUENCER) || (defined(MODULE) && defined(CONFIG_SND_SEQUENCER_MODULE))
1481 static void snd_rawmidi_dev_seq_free(struct snd_seq_device *device)
1482 {
1483         struct snd_rawmidi *rmidi = device->private_data;
1484         rmidi->seq_dev = NULL;
1485 }
1486 #endif
1487
1488 static int snd_rawmidi_dev_register(struct snd_device *device)
1489 {
1490         int idx, err;
1491         struct snd_info_entry *entry;
1492         char name[16];
1493         struct snd_rawmidi *rmidi = device->device_data;
1494
1495         if (rmidi->device >= SNDRV_RAWMIDI_DEVICES)
1496                 return -ENOMEM;
1497         down(&register_mutex);
1498         idx = (rmidi->card->number * SNDRV_RAWMIDI_DEVICES) + rmidi->device;
1499         if (snd_rawmidi_devices[idx] != NULL) {
1500                 up(&register_mutex);
1501                 return -EBUSY;
1502         }
1503         snd_rawmidi_devices[idx] = rmidi;
1504         sprintf(name, "midiC%iD%i", rmidi->card->number, rmidi->device);
1505         if ((err = snd_register_device(SNDRV_DEVICE_TYPE_RAWMIDI,
1506                                        rmidi->card, rmidi->device,
1507                                        &snd_rawmidi_reg, name)) < 0) {
1508                 snd_printk(KERN_ERR "unable to register rawmidi device %i:%i\n", rmidi->card->number, rmidi->device);
1509                 snd_rawmidi_devices[idx] = NULL;
1510                 up(&register_mutex);
1511                 return err;
1512         }
1513         if (rmidi->ops && rmidi->ops->dev_register &&
1514             (err = rmidi->ops->dev_register(rmidi)) < 0) {
1515                 snd_unregister_device(SNDRV_DEVICE_TYPE_RAWMIDI, rmidi->card, rmidi->device);
1516                 snd_rawmidi_devices[idx] = NULL;
1517                 up(&register_mutex);
1518                 return err;
1519         }
1520 #ifdef CONFIG_SND_OSSEMUL
1521         rmidi->ossreg = 0;
1522         if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1523                 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1524                                             rmidi->card, 0, &snd_rawmidi_reg, name) < 0) {
1525                         snd_printk(KERN_ERR "unable to register OSS rawmidi device %i:%i\n", rmidi->card->number, 0);
1526                 } else {
1527                         rmidi->ossreg++;
1528 #ifdef SNDRV_OSS_INFO_DEV_MIDI
1529                         snd_oss_info_register(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number, rmidi->name);
1530 #endif
1531                 }
1532         }
1533         if ((int)rmidi->device == amidi_map[rmidi->card->number]) {
1534                 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1535                                             rmidi->card, 1, &snd_rawmidi_reg, name) < 0) {
1536                         snd_printk(KERN_ERR "unable to register OSS rawmidi device %i:%i\n", rmidi->card->number, 1);
1537                 } else {
1538                         rmidi->ossreg++;
1539                 }
1540         }
1541 #endif /* CONFIG_SND_OSSEMUL */
1542         up(&register_mutex);
1543         sprintf(name, "midi%d", rmidi->device);
1544         entry = snd_info_create_card_entry(rmidi->card, name, rmidi->card->proc_root);
1545         if (entry) {
1546                 entry->private_data = rmidi;
1547                 entry->c.text.read_size = 1024;
1548                 entry->c.text.read = snd_rawmidi_proc_info_read;
1549                 if (snd_info_register(entry) < 0) {
1550                         snd_info_free_entry(entry);
1551                         entry = NULL;
1552                 }
1553         }
1554         rmidi->proc_entry = entry;
1555 #if defined(CONFIG_SND_SEQUENCER) || (defined(MODULE) && defined(CONFIG_SND_SEQUENCER_MODULE))
1556         if (!rmidi->ops || !rmidi->ops->dev_register) { /* own registration mechanism */
1557                 if (snd_seq_device_new(rmidi->card, rmidi->device, SNDRV_SEQ_DEV_ID_MIDISYNTH, 0, &rmidi->seq_dev) >= 0) {
1558                         rmidi->seq_dev->private_data = rmidi;
1559                         rmidi->seq_dev->private_free = snd_rawmidi_dev_seq_free;
1560                         sprintf(rmidi->seq_dev->name, "MIDI %d-%d", rmidi->card->number, rmidi->device);
1561                         snd_device_register(rmidi->card, rmidi->seq_dev);
1562                 }
1563         }
1564 #endif
1565         return 0;
1566 }
1567
1568 static int snd_rawmidi_dev_disconnect(struct snd_device *device)
1569 {
1570         struct snd_rawmidi *rmidi = device->device_data;
1571         int idx;
1572
1573         down(&register_mutex);
1574         idx = (rmidi->card->number * SNDRV_RAWMIDI_DEVICES) + rmidi->device;
1575         snd_rawmidi_devices[idx] = NULL;
1576         up(&register_mutex);
1577         return 0;
1578 }
1579
1580 static int snd_rawmidi_dev_unregister(struct snd_device *device)
1581 {
1582         int idx;
1583         struct snd_rawmidi *rmidi = device->device_data;
1584
1585         snd_assert(rmidi != NULL, return -ENXIO);
1586         down(&register_mutex);
1587         idx = (rmidi->card->number * SNDRV_RAWMIDI_DEVICES) + rmidi->device;
1588         snd_rawmidi_devices[idx] = NULL;
1589         if (rmidi->proc_entry) {
1590                 snd_info_unregister(rmidi->proc_entry);
1591                 rmidi->proc_entry = NULL;
1592         }
1593 #ifdef CONFIG_SND_OSSEMUL
1594         if (rmidi->ossreg) {
1595                 if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1596                         snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 0);
1597 #ifdef SNDRV_OSS_INFO_DEV_MIDI
1598                         snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number);
1599 #endif
1600                 }
1601                 if ((int)rmidi->device == amidi_map[rmidi->card->number])
1602                         snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 1);
1603                 rmidi->ossreg = 0;
1604         }
1605 #endif /* CONFIG_SND_OSSEMUL */
1606         if (rmidi->ops && rmidi->ops->dev_unregister)
1607                 rmidi->ops->dev_unregister(rmidi);
1608         snd_unregister_device(SNDRV_DEVICE_TYPE_RAWMIDI, rmidi->card, rmidi->device);
1609         up(&register_mutex);
1610 #if defined(CONFIG_SND_SEQUENCER) || (defined(MODULE) && defined(CONFIG_SND_SEQUENCER_MODULE))
1611         if (rmidi->seq_dev) {
1612                 snd_device_free(rmidi->card, rmidi->seq_dev);
1613                 rmidi->seq_dev = NULL;
1614         }
1615 #endif
1616         return snd_rawmidi_free(rmidi);
1617 }
1618
1619 /**
1620  * snd_rawmidi_set_ops - set the rawmidi operators
1621  * @rmidi: the rawmidi instance
1622  * @stream: the stream direction, SNDRV_RAWMIDI_STREAM_XXX
1623  * @ops: the operator table
1624  *
1625  * Sets the rawmidi operators for the given stream direction.
1626  */
1627 void snd_rawmidi_set_ops(struct snd_rawmidi *rmidi, int stream,
1628                          struct snd_rawmidi_ops *ops)
1629 {
1630         struct list_head *list;
1631         struct snd_rawmidi_substream *substream;
1632
1633         list_for_each(list, &rmidi->streams[stream].substreams) {
1634                 substream = list_entry(list, struct snd_rawmidi_substream, list);
1635                 substream->ops = ops;
1636         }
1637 }
1638
1639 /*
1640  *  ENTRY functions
1641  */
1642
1643 static int __init alsa_rawmidi_init(void)
1644 {
1645
1646         snd_ctl_register_ioctl(snd_rawmidi_control_ioctl);
1647         snd_ctl_register_ioctl_compat(snd_rawmidi_control_ioctl);
1648 #ifdef CONFIG_SND_OSSEMUL
1649         { int i;
1650         /* check device map table */
1651         for (i = 0; i < SNDRV_CARDS; i++) {
1652                 if (midi_map[i] < 0 || midi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1653                         snd_printk(KERN_ERR "invalid midi_map[%d] = %d\n", i, midi_map[i]);
1654                         midi_map[i] = 0;
1655                 }
1656                 if (amidi_map[i] < 0 || amidi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1657                         snd_printk(KERN_ERR "invalid amidi_map[%d] = %d\n", i, amidi_map[i]);
1658                         amidi_map[i] = 1;
1659                 }
1660         }
1661         }
1662 #endif /* CONFIG_SND_OSSEMUL */
1663         return 0;
1664 }
1665
1666 static void __exit alsa_rawmidi_exit(void)
1667 {
1668         snd_ctl_unregister_ioctl(snd_rawmidi_control_ioctl);
1669         snd_ctl_unregister_ioctl_compat(snd_rawmidi_control_ioctl);
1670 }
1671
1672 module_init(alsa_rawmidi_init)
1673 module_exit(alsa_rawmidi_exit)
1674
1675 EXPORT_SYMBOL(snd_rawmidi_output_params);
1676 EXPORT_SYMBOL(snd_rawmidi_input_params);
1677 EXPORT_SYMBOL(snd_rawmidi_drop_output);
1678 EXPORT_SYMBOL(snd_rawmidi_drain_output);
1679 EXPORT_SYMBOL(snd_rawmidi_drain_input);
1680 EXPORT_SYMBOL(snd_rawmidi_receive);
1681 EXPORT_SYMBOL(snd_rawmidi_transmit_empty);
1682 EXPORT_SYMBOL(snd_rawmidi_transmit_peek);
1683 EXPORT_SYMBOL(snd_rawmidi_transmit_ack);
1684 EXPORT_SYMBOL(snd_rawmidi_transmit);
1685 EXPORT_SYMBOL(snd_rawmidi_new);
1686 EXPORT_SYMBOL(snd_rawmidi_set_ops);
1687 EXPORT_SYMBOL(snd_rawmidi_info);
1688 EXPORT_SYMBOL(snd_rawmidi_info_select);
1689 EXPORT_SYMBOL(snd_rawmidi_kernel_open);
1690 EXPORT_SYMBOL(snd_rawmidi_kernel_release);
1691 EXPORT_SYMBOL(snd_rawmidi_kernel_read);
1692 EXPORT_SYMBOL(snd_rawmidi_kernel_write);