git.oblomov.eu Git - linux-2.6/blob - sound/core/rawmidi.c

   1 /*
   2  *  Abstract layer for MIDI v1.0 stream
   3  *  Copyright (c) by Jaroslav Kysela <perex@suse.cz>
   4  *
   5  *
   6  *   This program is free software; you can redistribute it and/or modify
   7  *   it under the terms of the GNU General Public License as published by
   8  *   the Free Software Foundation; either version 2 of the License, or
   9  *   (at your option) any later version.
  10  *
  11  *   This program is distributed in the hope that it will be useful,
  12  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *   GNU General Public License for more details.
  15  *
  16  *   You should have received a copy of the GNU General Public License
  17  *   along with this program; if not, write to the Free Software
  18  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  19  *
  20  */
  21
  22 #include <sound/driver.h>
  23 #include <sound/core.h>
  24 #include <linux/major.h>
  25 #include <linux/init.h>
  26 #include <linux/smp_lock.h>
  27 #include <linux/sched.h>
  28 #include <linux/slab.h>
  29 #include <linux/time.h>
  30 #include <linux/wait.h>
  31 #include <linux/moduleparam.h>
  32 #include <linux/delay.h>
  33 #include <linux/wait.h>
  34 #include <sound/rawmidi.h>
  35 #include <sound/info.h>
  36 #include <sound/control.h>
  37 #include <sound/minors.h>
  38 #include <sound/initval.h>
  39
  40 MODULE_AUTHOR("Jaroslav Kysela <perex@suse.cz>");
  41 MODULE_DESCRIPTION("Midlevel RawMidi code for ALSA.");
  42 MODULE_LICENSE("GPL");
  43
  44 #ifdef CONFIG_SND_OSSEMUL
  45 static int midi_map[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS-1)] = 0};
  46 static int amidi_map[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS-1)] = 1};
  47 module_param_array(midi_map, int, NULL, 0444);
  48 MODULE_PARM_DESC(midi_map, "Raw MIDI device number assigned to 1st OSS device.");
  49 module_param_array(amidi_map, int, NULL, 0444);
  50 MODULE_PARM_DESC(amidi_map, "Raw MIDI device number assigned to 2nd OSS device.");
  51 #endif /* CONFIG_SND_OSSEMUL */
  52
  53 static int snd_rawmidi_free(snd_rawmidi_t *rawmidi);
  54 static int snd_rawmidi_dev_free(snd_device_t *device);
  55 static int snd_rawmidi_dev_register(snd_device_t *device);
  56 static int snd_rawmidi_dev_disconnect(snd_device_t *device);
  57 static int snd_rawmidi_dev_unregister(snd_device_t *device);
  58
  59 static snd_rawmidi_t *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(snd_rawmidi_substream_t * substream)
  76 {
  77         snd_rawmidi_runtime_t *runtime = substream->runtime;
  78         return runtime->avail >= runtime->avail_min;
  79 }
  80
  81 static inline int snd_rawmidi_ready_append(snd_rawmidi_substream_t * substream, size_t count)
  82 {
  83         snd_rawmidi_runtime_t *runtime = substream->runtime;
  84         return runtime->avail >= runtime->avail_min &&
  85                (!substream->append || runtime->avail >= count);
  86 }
  87
  88 static void snd_rawmidi_input_event_tasklet(unsigned long data)
  89 {
  90         snd_rawmidi_substream_t *substream = (snd_rawmidi_substream_t *)data;
  91         substream->runtime->event(substream);
  92 }
  93
  94 static void snd_rawmidi_output_trigger_tasklet(unsigned long data)
  95 {
  96         snd_rawmidi_substream_t *substream = (snd_rawmidi_substream_t *)data;
  97         substream->ops->trigger(substream, 1);
  98 }
  99
 100 static int snd_rawmidi_runtime_create(snd_rawmidi_substream_t * substream)
 101 {
 102         snd_rawmidi_runtime_t *runtime;
 103
 104         if ((runtime = kzalloc(sizeof(*runtime), GFP_KERNEL)) == NULL)
 105                 return -ENOMEM;
 106         spin_lock_init(&runtime->lock);
 107         init_waitqueue_head(&runtime->sleep);
 108         if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
 109                 tasklet_init(&runtime->tasklet,
 110                              snd_rawmidi_input_event_tasklet,
 111                              (unsigned long)substream);
 112         else
 113                 tasklet_init(&runtime->tasklet,
 114                              snd_rawmidi_output_trigger_tasklet,
 115                              (unsigned long)substream);
 116         runtime->event = NULL;
 117         runtime->buffer_size = PAGE_SIZE;
 118         runtime->avail_min = 1;
 119         if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
 120                 runtime->avail = 0;
 121         else
 122                 runtime->avail = runtime->buffer_size;
 123         if ((runtime->buffer = kmalloc(runtime->buffer_size, GFP_KERNEL)) == NULL) {
 124                 kfree(runtime);
 125                 return -ENOMEM;
 126         }
 127         runtime->appl_ptr = runtime->hw_ptr = 0;
 128         substream->runtime = runtime;
 129         return 0;
 130 }
 131
 132 static int snd_rawmidi_runtime_free(snd_rawmidi_substream_t * substream)
 133 {
 134         snd_rawmidi_runtime_t *runtime = substream->runtime;
 135
 136         kfree(runtime->buffer);
 137         kfree(runtime);
 138         substream->runtime = NULL;
 139         return 0;
 140 }
 141
 142 static inline void snd_rawmidi_output_trigger(snd_rawmidi_substream_t * substream, int up)
 143 {
 144         if (up) {
 145                 tasklet_hi_schedule(&substream->runtime->tasklet);
 146         } else {
 147                 tasklet_kill(&substream->runtime->tasklet);
 148                 substream->ops->trigger(substream, 0);
 149         }
 150 }
 151
 152 static void snd_rawmidi_input_trigger(snd_rawmidi_substream_t * substream, int up)
 153 {
 154         substream->ops->trigger(substream, up);
 155         if (!up && substream->runtime->event)
 156                 tasklet_kill(&substream->runtime->tasklet);
 157 }
 158
 159 int snd_rawmidi_drop_output(snd_rawmidi_substream_t * substream)
 160 {
 161         unsigned long flags;
 162         snd_rawmidi_runtime_t *runtime = substream->runtime;
 163
 164         snd_rawmidi_output_trigger(substream, 0);
 165         runtime->drain = 0;
 166         spin_lock_irqsave(&runtime->lock, flags);
 167         runtime->appl_ptr = runtime->hw_ptr = 0;
 168         runtime->avail = runtime->buffer_size;
 169         spin_unlock_irqrestore(&runtime->lock, flags);
 170         return 0;
 171 }
 172
 173 int snd_rawmidi_drain_output(snd_rawmidi_substream_t * substream)
 174 {
 175         int err;
 176         long timeout;
 177         snd_rawmidi_runtime_t *runtime = substream->runtime;
 178
 179         err = 0;
 180         runtime->drain = 1;
 181         timeout = wait_event_interruptible_timeout(runtime->sleep,
 182                                 (runtime->avail >= runtime->buffer_size),
 183                                 10*HZ);
 184         if (signal_pending(current))
 185                 err = -ERESTARTSYS;
 186         if (runtime->avail < runtime->buffer_size && !timeout) {
 187                 snd_printk(KERN_WARNING "rawmidi drain error (avail = %li, buffer_size = %li)\n", (long)runtime->avail, (long)runtime->buffer_size);
 188                 err = -EIO;
 189         }
 190         runtime->drain = 0;
 191         if (err != -ERESTARTSYS) {
 192                 /* we need wait a while to make sure that Tx FIFOs are empty */
 193                 if (substream->ops->drain)
 194                         substream->ops->drain(substream);
 195                 else
 196                         msleep(50);
 197                 snd_rawmidi_drop_output(substream);
 198         }
 199         return err;
 200 }
 201
 202 int snd_rawmidi_drain_input(snd_rawmidi_substream_t * substream)
 203 {
 204         unsigned long flags;
 205         snd_rawmidi_runtime_t *runtime = substream->runtime;
 206
 207         snd_rawmidi_input_trigger(substream, 0);
 208         runtime->drain = 0;
 209         spin_lock_irqsave(&runtime->lock, flags);
 210         runtime->appl_ptr = runtime->hw_ptr = 0;
 211         runtime->avail = 0;
 212         spin_unlock_irqrestore(&runtime->lock, flags);
 213         return 0;
 214 }
 215
 216 int snd_rawmidi_kernel_open(int cardnum, int device, int subdevice,
 217                             int mode, snd_rawmidi_file_t * rfile)
 218 {
 219         snd_rawmidi_t *rmidi;
 220         struct list_head *list1, *list2;
 221         snd_rawmidi_substream_t *sinput = NULL, *soutput = NULL;
 222         snd_rawmidi_runtime_t *input = NULL, *output = NULL;
 223         int err;
 224
 225         if (rfile)
 226                 rfile->input = rfile->output = NULL;
 227         rmidi = snd_rawmidi_devices[(cardnum * SNDRV_RAWMIDI_DEVICES) + device];
 228         if (rmidi == NULL) {
 229                 err = -ENODEV;
 230                 goto __error1;
 231         }
 232         if (!try_module_get(rmidi->card->module)) {
 233                 err = -EFAULT;
 234                 goto __error1;
 235         }
 236         if (!(mode & SNDRV_RAWMIDI_LFLG_NOOPENLOCK))
 237                 down(&rmidi->open_mutex);
 238         if (mode & SNDRV_RAWMIDI_LFLG_INPUT) {
 239                 if (!(rmidi->info_flags & SNDRV_RAWMIDI_INFO_INPUT)) {
 240                         err = -ENXIO;
 241                         goto __error;
 242                 }
 243                 if (subdevice >= 0 && (unsigned int)subdevice >= rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substream_count) {
 244                         err = -ENODEV;
 245                         goto __error;
 246                 }
 247                 if (rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substream_opened >=
 248                     rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substream_count) {
 249                         err = -EAGAIN;
 250                         goto __error;
 251                 }
 252         }
 253         if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) {
 254                 if (!(rmidi->info_flags & SNDRV_RAWMIDI_INFO_OUTPUT)) {
 255                         err = -ENXIO;
 256                         goto __error;
 257                 }
 258                 if (subdevice >= 0 && (unsigned int)subdevice >= rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substream_count) {
 259                         err = -ENODEV;
 260                         goto __error;
 261                 }
 262                 if (rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substream_opened >=
 263                     rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substream_count) {
 264                         err = -EAGAIN;
 265                         goto __error;
 266                 }
 267         }
 268         list1 = rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams.next;
 269         while (1) {
 270                 if (list1 == &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams) {
 271                         sinput = NULL;
 272                         if (mode & SNDRV_RAWMIDI_LFLG_INPUT) {
 273                                 err = -EAGAIN;
 274                                 goto __error;
 275                         }
 276                         break;
 277                 }
 278                 sinput = list_entry(list1, snd_rawmidi_substream_t, list);
 279                 if ((mode & SNDRV_RAWMIDI_LFLG_INPUT) && sinput->opened)
 280                         goto __nexti;
 281                 if (subdevice < 0 || (subdevice >= 0 && subdevice == sinput->number))
 282                         break;
 283               __nexti:
 284                 list1 = list1->next;
 285         }
 286         list2 = rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams.next;
 287         while (1) {
 288                 if (list2 == &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams) {
 289                         soutput = NULL;
 290                         if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) {
 291                                 err = -EAGAIN;
 292                                 goto __error;
 293                         }
 294                         break;
 295                 }
 296                 soutput = list_entry(list2, snd_rawmidi_substream_t, list);
 297                 if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) {
 298                         if (mode & SNDRV_RAWMIDI_LFLG_APPEND) {
 299                                 if (soutput->opened && !soutput->append)
 300                                         goto __nexto;
 301                         } else {
 302                                 if (soutput->opened)
 303                                         goto __nexto;
 304                         }
 305                 }
 306                 if (subdevice < 0 || (subdevice >= 0 && subdevice == soutput->number))
 307                         break;
 308               __nexto:
 309                 list2 = list2->next;
 310         }
 311         if (mode & SNDRV_RAWMIDI_LFLG_INPUT) {
 312                 if ((err = snd_rawmidi_runtime_create(sinput)) < 0)
 313                         goto __error;
 314                 input = sinput->runtime;
 315                 if ((err = sinput->ops->open(sinput)) < 0)
 316                         goto __error;
 317                 sinput->opened = 1;
 318                 rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substream_opened++;
 319         } else {
 320                 sinput = NULL;
 321         }
 322         if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) {
 323                 if (soutput->opened)
 324                         goto __skip_output;
 325                 if ((err = snd_rawmidi_runtime_create(soutput)) < 0) {
 326                         if (mode & SNDRV_RAWMIDI_LFLG_INPUT)
 327                                 sinput->ops->close(sinput);
 328                         goto __error;
 329                 }
 330                 output = soutput->runtime;
 331                 if ((err = soutput->ops->open(soutput)) < 0) {
 332                         if (mode & SNDRV_RAWMIDI_LFLG_INPUT)
 333                                 sinput->ops->close(sinput);
 334                         goto __error;
 335                 }
 336               __skip_output:
 337                 soutput->opened = 1;
 338                 if (mode & SNDRV_RAWMIDI_LFLG_APPEND)
 339                         soutput->append = 1;
 340                 if (soutput->use_count++ == 0)
 341                         soutput->active_sensing = 1;
 342                 rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substream_opened++;
 343         } else {
 344                 soutput = NULL;
 345         }
 346         if (!(mode & SNDRV_RAWMIDI_LFLG_NOOPENLOCK))
 347                 up(&rmidi->open_mutex);
 348         if (rfile) {
 349                 rfile->rmidi = rmidi;
 350                 rfile->input = sinput;
 351                 rfile->output = soutput;
 352         }
 353         return 0;
 354
 355       __error:
 356         if (input != NULL)
 357                 snd_rawmidi_runtime_free(sinput);
 358         if (output != NULL)
 359                 snd_rawmidi_runtime_free(soutput);
 360         module_put(rmidi->card->module);
 361         if (!(mode & SNDRV_RAWMIDI_LFLG_NOOPENLOCK))
 362                 up(&rmidi->open_mutex);
 363       __error1:
 364         return err;
 365 }
 366
 367 static int snd_rawmidi_open(struct inode *inode, struct file *file)
 368 {
 369         int maj = imajor(inode);
 370         int cardnum;
 371         snd_card_t *card;
 372         int device, subdevice;
 373         unsigned short fflags;
 374         int err;
 375         snd_rawmidi_t *rmidi;
 376         snd_rawmidi_file_t *rawmidi_file;
 377         wait_queue_t wait;
 378         struct list_head *list;
 379         snd_ctl_file_t *kctl;
 380
 381         if (maj == snd_major) {
 382                 cardnum = SNDRV_MINOR_CARD(iminor(inode));
 383                 cardnum %= SNDRV_CARDS;
 384                 device = SNDRV_MINOR_DEVICE(iminor(inode)) - SNDRV_MINOR_RAWMIDI;
 385                 device %= SNDRV_MINOR_RAWMIDIS;
 386 #ifdef CONFIG_SND_OSSEMUL
 387         } else if (maj == SOUND_MAJOR) {
 388                 cardnum = SNDRV_MINOR_OSS_CARD(iminor(inode));
 389                 cardnum %= SNDRV_CARDS;
 390                 device = SNDRV_MINOR_OSS_DEVICE(iminor(inode)) == SNDRV_MINOR_OSS_MIDI ?
 391                         midi_map[cardnum] : amidi_map[cardnum];
 392 #endif
 393         } else
 394                 return -ENXIO;
 395
 396         rmidi = snd_rawmidi_devices[(cardnum * SNDRV_RAWMIDI_DEVICES) + device];
 397         if (rmidi == NULL)
 398                 return -ENODEV;
 399 #ifdef CONFIG_SND_OSSEMUL
 400         if (maj == SOUND_MAJOR && !rmidi->ossreg)
 401                 return -ENXIO;
 402 #endif
 403         if ((file->f_flags & O_APPEND) && !(file->f_flags & O_NONBLOCK))
 404                 return -EINVAL;         /* invalid combination */
 405         card = rmidi->card;
 406         err = snd_card_file_add(card, file);
 407         if (err < 0)
 408                 return -ENODEV;
 409         fflags = snd_rawmidi_file_flags(file);
 410         if ((file->f_flags & O_APPEND) || maj == SOUND_MAJOR) /* OSS emul? */
 411                 fflags |= SNDRV_RAWMIDI_LFLG_APPEND;
 412         fflags |= SNDRV_RAWMIDI_LFLG_NOOPENLOCK;
 413         rawmidi_file = kmalloc(sizeof(*rawmidi_file), GFP_KERNEL);
 414         if (rawmidi_file == NULL) {
 415                 snd_card_file_remove(card, file);
 416                 return -ENOMEM;
 417         }
 418         init_waitqueue_entry(&wait, current);
 419         add_wait_queue(&rmidi->open_wait, &wait);
 420         down(&rmidi->open_mutex);
 421         while (1) {
 422                 subdevice = -1;
 423                 down_read(&card->controls_rwsem);
 424                 list_for_each(list, &card->ctl_files) {
 425                         kctl = snd_ctl_file(list);
 426                         if (kctl->pid == current->pid) {
 427                                 subdevice = kctl->prefer_rawmidi_subdevice;
 428                                 break;
 429                         }
 430                 }
 431                 up_read(&card->controls_rwsem);
 432                 err = snd_rawmidi_kernel_open(cardnum, device, subdevice, fflags, rawmidi_file);
 433                 if (err >= 0)
 434                         break;
 435                 if (err == -EAGAIN) {
 436                         if (file->f_flags & O_NONBLOCK) {
 437                                 err = -EBUSY;
 438                                 break;
 439                         }
 440                 } else
 441                         break;
 442                 set_current_state(TASK_INTERRUPTIBLE);
 443                 up(&rmidi->open_mutex);
 444                 schedule();
 445                 down(&rmidi->open_mutex);
 446                 if (signal_pending(current)) {
 447                         err = -ERESTARTSYS;
 448                         break;
 449                 }
 450         }
 451 #ifdef CONFIG_SND_OSSEMUL
 452         if (rawmidi_file->input && rawmidi_file->input->runtime)
 453                 rawmidi_file->input->runtime->oss = (maj == SOUND_MAJOR);
 454         if (rawmidi_file->output && rawmidi_file->output->runtime)
 455                 rawmidi_file->output->runtime->oss = (maj == SOUND_MAJOR);
 456 #endif
 457         remove_wait_queue(&rmidi->open_wait, &wait);
 458         if (err >= 0) {
 459                 file->private_data = rawmidi_file;
 460         } else {
 461                 snd_card_file_remove(card, file);
 462                 kfree(rawmidi_file);
 463         }
 464         up(&rmidi->open_mutex);
 465         return err;
 466 }
 467
 468 int snd_rawmidi_kernel_release(snd_rawmidi_file_t * rfile)
 469 {
 470         snd_rawmidi_t *rmidi;
 471         snd_rawmidi_substream_t *substream;
 472         snd_rawmidi_runtime_t *runtime;
 473
 474         snd_assert(rfile != NULL, return -ENXIO);
 475         snd_assert(rfile->input != NULL || rfile->output != NULL, return -ENXIO);
 476         rmidi = rfile->rmidi;
 477         down(&rmidi->open_mutex);
 478         if (rfile->input != NULL) {
 479                 substream = rfile->input;
 480                 rfile->input = NULL;
 481                 runtime = substream->runtime;
 482                 snd_rawmidi_input_trigger(substream, 0);
 483                 substream->ops->close(substream);
 484                 if (runtime->private_free != NULL)
 485                         runtime->private_free(substream);
 486                 snd_rawmidi_runtime_free(substream);
 487                 substream->opened = 0;
 488                 rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substream_opened--;
 489         }
 490         if (rfile->output != NULL) {
 491                 substream = rfile->output;
 492                 rfile->output = NULL;
 493                 if (--substream->use_count == 0) {
 494                         runtime = substream->runtime;
 495                         if (substream->active_sensing) {
 496                                 unsigned char buf = 0xfe;
 497                                 /* sending single active sensing message to shut the device up */
 498                                 snd_rawmidi_kernel_write(substream, &buf, 1);
 499                         }
 500                         if (snd_rawmidi_drain_output(substream) == -ERESTARTSYS)
 501                                 snd_rawmidi_output_trigger(substream, 0);
 502                         substream->ops->close(substream);
 503                         if (runtime->private_free != NULL)
 504                                 runtime->private_free(substream);
 505                         snd_rawmidi_runtime_free(substream);
 506                         substream->opened = 0;
 507                         substream->append = 0;
 508                 }
 509                 rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substream_opened--;
 510         }
 511         up(&rmidi->open_mutex);
 512         module_put(rmidi->card->module);
 513         return 0;
 514 }
 515
 516 static int snd_rawmidi_release(struct inode *inode, struct file *file)
 517 {
 518         snd_rawmidi_file_t *rfile;
 519         snd_rawmidi_t *rmidi;
 520         int err;
 521
 522         rfile = file->private_data;
 523         err = snd_rawmidi_kernel_release(rfile);
 524         rmidi = rfile->rmidi;
 525         wake_up(&rmidi->open_wait);
 526         kfree(rfile);
 527         snd_card_file_remove(rmidi->card, file);
 528         return err;
 529 }
 530
 531 int snd_rawmidi_info(snd_rawmidi_substream_t *substream, snd_rawmidi_info_t *info)
 532 {
 533         snd_rawmidi_t *rmidi;
 534
 535         if (substream == NULL)
 536                 return -ENODEV;
 537         rmidi = substream->rmidi;
 538         memset(info, 0, sizeof(*info));
 539         info->card = rmidi->card->number;
 540         info->device = rmidi->device;
 541         info->subdevice = substream->number;
 542         info->stream = substream->stream;
 543         info->flags = rmidi->info_flags;
 544         strcpy(info->id, rmidi->id);
 545         strcpy(info->name, rmidi->name);
 546         strcpy(info->subname, substream->name);
 547         info->subdevices_count = substream->pstr->substream_count;
 548         info->subdevices_avail = (substream->pstr->substream_count -
 549                                   substream->pstr->substream_opened);
 550         return 0;
 551 }
 552
 553 static int snd_rawmidi_info_user(snd_rawmidi_substream_t *substream, snd_rawmidi_info_t __user * _info)
 554 {
 555         snd_rawmidi_info_t info;
 556         int err;
 557         if ((err = snd_rawmidi_info(substream, &info)) < 0)
 558                 return err;
 559         if (copy_to_user(_info, &info, sizeof(snd_rawmidi_info_t)))
 560                 return -EFAULT;
 561         return 0;
 562 }
 563
 564 int snd_rawmidi_info_select(snd_card_t *card, snd_rawmidi_info_t *info)
 565 {
 566         snd_rawmidi_t *rmidi;
 567         snd_rawmidi_str_t *pstr;
 568         snd_rawmidi_substream_t *substream;
 569         struct list_head *list;
 570         if (info->device >= SNDRV_RAWMIDI_DEVICES)
 571                 return -ENXIO;
 572         rmidi = snd_rawmidi_devices[card->number * SNDRV_RAWMIDI_DEVICES + info->device];
 573         if (info->stream < 0 || info->stream > 1)
 574                 return -EINVAL;
 575         pstr = &rmidi->streams[info->stream];
 576         if (pstr->substream_count == 0)
 577                 return -ENOENT;
 578         if (info->subdevice >= pstr->substream_count)
 579                 return -ENXIO;
 580         list_for_each(list, &pstr->substreams) {
 581                 substream = list_entry(list, snd_rawmidi_substream_t, list);
 582                 if ((unsigned int)substream->number == info->subdevice)
 583                         return snd_rawmidi_info(substream, info);
 584         }
 585         return -ENXIO;
 586 }
 587
 588 static int snd_rawmidi_info_select_user(snd_card_t *card,
 589                                         snd_rawmidi_info_t __user *_info)
 590 {
 591         int err;
 592         snd_rawmidi_info_t info;
 593         if (get_user(info.device, &_info->device))
 594                 return -EFAULT;
 595         if (get_user(info.stream, &_info->stream))
 596                 return -EFAULT;
 597         if (get_user(info.subdevice, &_info->subdevice))
 598                 return -EFAULT;
 599         if ((err = snd_rawmidi_info_select(card, &info)) < 0)
 600                 return err;
 601         if (copy_to_user(_info, &info, sizeof(snd_rawmidi_info_t)))
 602                 return -EFAULT;
 603         return 0;
 604 }
 605
 606 int snd_rawmidi_output_params(snd_rawmidi_substream_t * substream,
 607                               snd_rawmidi_params_t * params)
 608 {
 609         char *newbuf;
 610         snd_rawmidi_runtime_t *runtime = substream->runtime;
 611
 612         if (substream->append && substream->use_count > 1)
 613                 return -EBUSY;
 614         snd_rawmidi_drain_output(substream);
 615         if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L) {
 616                 return -EINVAL;
 617         }
 618         if (params->avail_min < 1 || params->avail_min > params->buffer_size) {
 619                 return -EINVAL;
 620         }
 621         if (params->buffer_size != runtime->buffer_size) {
 622                 if ((newbuf = (char *) kmalloc(params->buffer_size, GFP_KERNEL)) == NULL)
 623                         return -ENOMEM;
 624                 kfree(runtime->buffer);
 625                 runtime->buffer = newbuf;
 626                 runtime->buffer_size = params->buffer_size;
 627         }
 628         runtime->avail_min = params->avail_min;
 629         substream->active_sensing = !params->no_active_sensing;
 630         return 0;
 631 }
 632
 633 int snd_rawmidi_input_params(snd_rawmidi_substream_t * substream,
 634                              snd_rawmidi_params_t * params)
 635 {
 636         char *newbuf;
 637         snd_rawmidi_runtime_t *runtime = substream->runtime;
 638
 639         snd_rawmidi_drain_input(substream);
 640         if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L) {
 641                 return -EINVAL;
 642         }
 643         if (params->avail_min < 1 || params->avail_min > params->buffer_size) {
 644                 return -EINVAL;
 645         }
 646         if (params->buffer_size != runtime->buffer_size) {
 647                 if ((newbuf = (char *) kmalloc(params->buffer_size, GFP_KERNEL)) == NULL)
 648                         return -ENOMEM;
 649                 kfree(runtime->buffer);
 650                 runtime->buffer = newbuf;
 651                 runtime->buffer_size = params->buffer_size;
 652         }
 653         runtime->avail_min = params->avail_min;
 654         return 0;
 655 }
 656
 657 static int snd_rawmidi_output_status(snd_rawmidi_substream_t * substream,
 658                                      snd_rawmidi_status_t * status)
 659 {
 660         snd_rawmidi_runtime_t *runtime = substream->runtime;
 661
 662         memset(status, 0, sizeof(*status));
 663         status->stream = SNDRV_RAWMIDI_STREAM_OUTPUT;
 664         spin_lock_irq(&runtime->lock);
 665         status->avail = runtime->avail;
 666         spin_unlock_irq(&runtime->lock);
 667         return 0;
 668 }
 669
 670 static int snd_rawmidi_input_status(snd_rawmidi_substream_t * substream,
 671                                     snd_rawmidi_status_t * status)
 672 {
 673         snd_rawmidi_runtime_t *runtime = substream->runtime;
 674
 675         memset(status, 0, sizeof(*status));
 676         status->stream = SNDRV_RAWMIDI_STREAM_INPUT;
 677         spin_lock_irq(&runtime->lock);
 678         status->avail = runtime->avail;
 679         status->xruns = runtime->xruns;
 680         runtime->xruns = 0;
 681         spin_unlock_irq(&runtime->lock);
 682         return 0;
 683 }
 684
 685 static long snd_rawmidi_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 686 {
 687         snd_rawmidi_file_t *rfile;
 688         void __user *argp = (void __user *)arg;
 689
 690         rfile = file->private_data;
 691         if (((cmd >> 8) & 0xff) != 'W')
 692                 return -ENOTTY;
 693         switch (cmd) {
 694         case SNDRV_RAWMIDI_IOCTL_PVERSION:
 695                 return put_user(SNDRV_RAWMIDI_VERSION, (int __user *)argp) ? -EFAULT : 0;
 696         case SNDRV_RAWMIDI_IOCTL_INFO:
 697         {
 698                 snd_rawmidi_stream_t stream;
 699                 snd_rawmidi_info_t __user *info = argp;
 700                 if (get_user(stream, &info->stream))
 701                         return -EFAULT;
 702                 switch (stream) {
 703                 case SNDRV_RAWMIDI_STREAM_INPUT:
 704                         return snd_rawmidi_info_user(rfile->input, info);
 705                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
 706                         return snd_rawmidi_info_user(rfile->output, info);
 707                 default:
 708                         return -EINVAL;
 709                 }
 710         }
 711         case SNDRV_RAWMIDI_IOCTL_PARAMS:
 712         {
 713                 snd_rawmidi_params_t params;
 714                 if (copy_from_user(&params, argp, sizeof(snd_rawmidi_params_t)))
 715                         return -EFAULT;
 716                 switch (params.stream) {
 717                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
 718                         if (rfile->output == NULL)
 719                                 return -EINVAL;
 720                         return snd_rawmidi_output_params(rfile->output, &params);
 721                 case SNDRV_RAWMIDI_STREAM_INPUT:
 722                         if (rfile->input == NULL)
 723                                 return -EINVAL;
 724                         return snd_rawmidi_input_params(rfile->input, &params);
 725                 default:
 726                         return -EINVAL;
 727                 }
 728         }
 729         case SNDRV_RAWMIDI_IOCTL_STATUS:
 730         {
 731                 int err = 0;
 732                 snd_rawmidi_status_t status;
 733                 if (copy_from_user(&status, argp, sizeof(snd_rawmidi_status_t)))
 734                         return -EFAULT;
 735                 switch (status.stream) {
 736                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
 737                         if (rfile->output == NULL)
 738                                 return -EINVAL;
 739                         err = snd_rawmidi_output_status(rfile->output, &status);
 740                         break;
 741                 case SNDRV_RAWMIDI_STREAM_INPUT:
 742                         if (rfile->input == NULL)
 743                                 return -EINVAL;
 744                         err = snd_rawmidi_input_status(rfile->input, &status);
 745                         break;
 746                 default:
 747                         return -EINVAL;
 748                 }
 749                 if (err < 0)
 750                         return err;
 751                 if (copy_to_user(argp, &status, sizeof(snd_rawmidi_status_t)))
 752                         return -EFAULT;
 753                 return 0;
 754         }
 755         case SNDRV_RAWMIDI_IOCTL_DROP:
 756         {
 757                 int val;
 758                 if (get_user(val, (int __user *) argp))
 759                         return -EFAULT;
 760                 switch (val) {
 761                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
 762                         if (rfile->output == NULL)
 763                                 return -EINVAL;
 764                         return snd_rawmidi_drop_output(rfile->output);
 765                 default:
 766                         return -EINVAL;
 767                 }
 768         }
 769         case SNDRV_RAWMIDI_IOCTL_DRAIN:
 770         {
 771                 int val;
 772                 if (get_user(val, (int __user *) argp))
 773                         return -EFAULT;
 774                 switch (val) {
 775                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
 776                         if (rfile->output == NULL)
 777                                 return -EINVAL;
 778                         return snd_rawmidi_drain_output(rfile->output);
 779                 case SNDRV_RAWMIDI_STREAM_INPUT:
 780                         if (rfile->input == NULL)
 781                                 return -EINVAL;
 782                         return snd_rawmidi_drain_input(rfile->input);
 783                 default:
 784                         return -EINVAL;
 785                 }
 786         }
 787 #ifdef CONFIG_SND_DEBUG
 788         default:
 789                 snd_printk(KERN_WARNING "rawmidi: unknown command = 0x%x\n", cmd);
 790 #endif
 791         }
 792         return -ENOTTY;
 793 }
 794
 795 static int snd_rawmidi_control_ioctl(snd_card_t * card,
 796                                      snd_ctl_file_t * control,
 797                                      unsigned int cmd,
 798                                      unsigned long arg)
 799 {
 800         void __user *argp = (void __user *)arg;
 801         unsigned int tmp;
 802
 803         tmp = card->number * SNDRV_RAWMIDI_DEVICES;
 804         switch (cmd) {
 805         case SNDRV_CTL_IOCTL_RAWMIDI_NEXT_DEVICE:
 806         {
 807                 int device;
 808
 809                 if (get_user(device, (int __user *)argp))
 810                         return -EFAULT;
 811                 device = device < 0 ? 0 : device + 1;
 812                 while (device < SNDRV_RAWMIDI_DEVICES) {
 813                         if (snd_rawmidi_devices[tmp + device])
 814                                 break;
 815                         device++;
 816                 }
 817                 if (device == SNDRV_RAWMIDI_DEVICES)
 818                         device = -1;
 819                 if (put_user(device, (int __user *)argp))
 820                         return -EFAULT;
 821                 return 0;
 822         }
 823         case SNDRV_CTL_IOCTL_RAWMIDI_PREFER_SUBDEVICE:
 824         {
 825                 int val;
 826
 827                 if (get_user(val, (int __user *)argp))
 828                         return -EFAULT;
 829                 control->prefer_rawmidi_subdevice = val;
 830                 return 0;
 831         }
 832         case SNDRV_CTL_IOCTL_RAWMIDI_INFO:
 833                 return snd_rawmidi_info_select_user(card, argp);
 834         }
 835         return -ENOIOCTLCMD;
 836 }
 837
 838 /**
 839  * snd_rawmidi_receive - receive the input data from the device
 840  * @substream: the rawmidi substream
 841  * @buffer: the buffer pointer
 842  * @count: the data size to read
 843  *
 844  * Reads the data from the internal buffer.
 845  *
 846  * Returns the size of read data, or a negative error code on failure.
 847  */
 848 int snd_rawmidi_receive(snd_rawmidi_substream_t * substream, const unsigned char *buffer, int count)
 849 {
 850         unsigned long flags;
 851         int result = 0, count1;
 852         snd_rawmidi_runtime_t *runtime = substream->runtime;
 853
 854         if (runtime->buffer == NULL) {
 855                 snd_printd("snd_rawmidi_receive: input is not active!!!\n");
 856                 return -EINVAL;
 857         }
 858         spin_lock_irqsave(&runtime->lock, flags);
 859         if (count == 1) {       /* special case, faster code */
 860                 substream->bytes++;
 861                 if (runtime->avail < runtime->buffer_size) {
 862                         runtime->buffer[runtime->hw_ptr++] = buffer[0];
 863                         runtime->hw_ptr %= runtime->buffer_size;
 864                         runtime->avail++;
 865                         result++;
 866                 } else {
 867                         runtime->xruns++;
 868                 }
 869         } else {
 870                 substream->bytes += count;
 871                 count1 = runtime->buffer_size - runtime->hw_ptr;
 872                 if (count1 > count)
 873                         count1 = count;
 874                 if (count1 > (int)(runtime->buffer_size - runtime->avail))
 875                         count1 = runtime->buffer_size - runtime->avail;
 876                 memcpy(runtime->buffer + runtime->hw_ptr, buffer, count1);
 877                 runtime->hw_ptr += count1;
 878                 runtime->hw_ptr %= runtime->buffer_size;
 879                 runtime->avail += count1;
 880                 count -= count1;
 881                 result += count1;
 882                 if (count > 0) {
 883                         buffer += count1;
 884                         count1 = count;
 885                         if (count1 > (int)(runtime->buffer_size - runtime->avail)) {
 886                                 count1 = runtime->buffer_size - runtime->avail;
 887                                 runtime->xruns += count - count1;
 888                         }
 889                         if (count1 > 0) {
 890                                 memcpy(runtime->buffer, buffer, count1);
 891                                 runtime->hw_ptr = count1;
 892                                 runtime->avail += count1;
 893                                 result += count1;
 894                         }
 895                 }
 896         }
 897         if (result > 0) {
 898                 if (runtime->event)
 899                         tasklet_hi_schedule(&runtime->tasklet);
 900                 else if (snd_rawmidi_ready(substream))
 901                         wake_up(&runtime->sleep);
 902         }
 903         spin_unlock_irqrestore(&runtime->lock, flags);
 904         return result;
 905 }
 906
 907 static long snd_rawmidi_kernel_read1(snd_rawmidi_substream_t *substream,
 908                                      unsigned char *buf, long count, int kernel)
 909 {
 910         unsigned long flags;
 911         long result = 0, count1;
 912         snd_rawmidi_runtime_t *runtime = substream->runtime;
 913
 914         while (count > 0 && runtime->avail) {
 915                 count1 = runtime->buffer_size - runtime->appl_ptr;
 916                 if (count1 > count)
 917                         count1 = count;
 918                 spin_lock_irqsave(&runtime->lock, flags);
 919                 if (count1 > (int)runtime->avail)
 920                         count1 = runtime->avail;
 921                 if (kernel) {
 922                         memcpy(buf + result, runtime->buffer + runtime->appl_ptr, count1);
 923                 } else {
 924                         spin_unlock_irqrestore(&runtime->lock, flags);
 925                         if (copy_to_user((char __user *)buf + result,
 926                                          runtime->buffer + runtime->appl_ptr, count1)) {
 927                                 return result > 0 ? result : -EFAULT;
 928                         }
 929                         spin_lock_irqsave(&runtime->lock, flags);
 930                 }
 931                 runtime->appl_ptr += count1;
 932                 runtime->appl_ptr %= runtime->buffer_size;
 933                 runtime->avail -= count1;
 934                 spin_unlock_irqrestore(&runtime->lock, flags);
 935                 result += count1;
 936                 count -= count1;
 937         }
 938         return result;
 939 }
 940
 941 long snd_rawmidi_kernel_read(snd_rawmidi_substream_t *substream, unsigned char *buf, long count)
 942 {
 943         snd_rawmidi_input_trigger(substream, 1);
 944         return snd_rawmidi_kernel_read1(substream, buf, count, 1);
 945 }
 946
 947 static ssize_t snd_rawmidi_read(struct file *file, char __user *buf, size_t count, loff_t *offset)
 948 {
 949         long result;
 950         int count1;
 951         snd_rawmidi_file_t *rfile;
 952         snd_rawmidi_substream_t *substream;
 953         snd_rawmidi_runtime_t *runtime;
 954
 955         rfile = file->private_data;
 956         substream = rfile->input;
 957         if (substream == NULL)
 958                 return -EIO;
 959         runtime = substream->runtime;
 960         snd_rawmidi_input_trigger(substream, 1);
 961         result = 0;
 962         while (count > 0) {
 963                 spin_lock_irq(&runtime->lock);
 964                 while (!snd_rawmidi_ready(substream)) {
 965                         wait_queue_t wait;
 966                         if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
 967                                 spin_unlock_irq(&runtime->lock);
 968                                 return result > 0 ? result : -EAGAIN;
 969                         }
 970                         init_waitqueue_entry(&wait, current);
 971                         add_wait_queue(&runtime->sleep, &wait);
 972                         set_current_state(TASK_INTERRUPTIBLE);
 973                         spin_unlock_irq(&runtime->lock);
 974                         schedule();
 975                         remove_wait_queue(&runtime->sleep, &wait);
 976                         if (signal_pending(current))
 977                                 return result > 0 ? result : -ERESTARTSYS;
 978                         if (!runtime->avail)
 979                                 return result > 0 ? result : -EIO;
 980                         spin_lock_irq(&runtime->lock);
 981                 }
 982                 spin_unlock_irq(&runtime->lock);
 983                 count1 = snd_rawmidi_kernel_read1(substream,
 984                                                   (unsigned char __force *)buf,
 985                                                   count, 0);
 986                 if (count1 < 0)
 987                         return result > 0 ? result : count1;
 988                 result += count1;
 989                 buf += count1;
 990                 count -= count1;
 991         }
 992         return result;
 993 }
 994
 995 /**
 996  * snd_rawmidi_transmit_empty - check whether the output buffer is empty
 997  * @substream: the rawmidi substream
 998  *
 999  * Returns 1 if the internal output buffer is empty, 0 if not.
1000  */
1001 int snd_rawmidi_transmit_empty(snd_rawmidi_substream_t * substream)
1002 {
1003         snd_rawmidi_runtime_t *runtime = substream->runtime;
1004         int result;
1005         unsigned long flags;
1006
1007         if (runtime->buffer == NULL) {
1008                 snd_printd("snd_rawmidi_transmit_empty: output is not active!!!\n");
1009                 return 1;
1010         }
1011         spin_lock_irqsave(&runtime->lock, flags);
1012         result = runtime->avail >= runtime->buffer_size;
1013         spin_unlock_irqrestore(&runtime->lock, flags);
1014         return result;
1015 }
1016
1017 /**
1018  * snd_rawmidi_transmit_peek - copy data from the internal buffer
1019  * @substream: the rawmidi substream
1020  * @buffer: the buffer pointer
1021  * @count: data size to transfer
1022  *
1023  * Copies data from the internal output buffer to the given buffer.
1024  *
1025  * Call this in the interrupt handler when the midi output is ready,
1026  * and call snd_rawmidi_transmit_ack() after the transmission is
1027  * finished.
1028  *
1029  * Returns the size of copied data, or a negative error code on failure.
1030  */
1031 int snd_rawmidi_transmit_peek(snd_rawmidi_substream_t * substream, unsigned char *buffer, int count)
1032 {
1033         unsigned long flags;
1034         int result, count1;
1035         snd_rawmidi_runtime_t *runtime = substream->runtime;
1036
1037         if (runtime->buffer == NULL) {
1038                 snd_printd("snd_rawmidi_transmit_peek: output is not active!!!\n");
1039                 return -EINVAL;
1040         }
1041         result = 0;
1042         spin_lock_irqsave(&runtime->lock, flags);
1043         if (runtime->avail >= runtime->buffer_size) {
1044                 /* warning: lowlevel layer MUST trigger down the hardware */
1045                 goto __skip;
1046         }
1047         if (count == 1) {       /* special case, faster code */
1048                 *buffer = runtime->buffer[runtime->hw_ptr];
1049                 result++;
1050         } else {
1051                 count1 = runtime->buffer_size - runtime->hw_ptr;
1052                 if (count1 > count)
1053                         count1 = count;
1054                 if (count1 > (int)(runtime->buffer_size - runtime->avail))
1055                         count1 = runtime->buffer_size - runtime->avail;
1056                 memcpy(buffer, runtime->buffer + runtime->hw_ptr, count1);
1057                 count -= count1;
1058                 result += count1;
1059                 if (count > 0) {
1060                         if (count > (int)(runtime->buffer_size - runtime->avail - count1))
1061                                 count = runtime->buffer_size - runtime->avail - count1;
1062                         memcpy(buffer + count1, runtime->buffer, count);
1063                         result += count;
1064                 }
1065         }
1066       __skip:
1067         spin_unlock_irqrestore(&runtime->lock, flags);
1068         return result;
1069 }
1070
1071 /**
1072  * snd_rawmidi_transmit_ack - acknowledge the transmission
1073  * @substream: the rawmidi substream
1074  * @count: the tranferred count
1075  *
1076  * Advances the hardware pointer for the internal output buffer with
1077  * the given size and updates the condition.
1078  * Call after the transmission is finished.
1079  *
1080  * Returns the advanced size if successful, or a negative error code on failure.
1081  */
1082 int snd_rawmidi_transmit_ack(snd_rawmidi_substream_t * substream, int count)
1083 {
1084         unsigned long flags;
1085         snd_rawmidi_runtime_t *runtime = substream->runtime;
1086
1087         if (runtime->buffer == NULL) {
1088                 snd_printd("snd_rawmidi_transmit_ack: output is not active!!!\n");
1089                 return -EINVAL;
1090         }
1091         spin_lock_irqsave(&runtime->lock, flags);
1092         snd_assert(runtime->avail + count <= runtime->buffer_size, );
1093         runtime->hw_ptr += count;
1094         runtime->hw_ptr %= runtime->buffer_size;
1095         runtime->avail += count;
1096         substream->bytes += count;
1097         if (count > 0) {
1098                 if (runtime->drain || snd_rawmidi_ready(substream))
1099                         wake_up(&runtime->sleep);
1100         }
1101         spin_unlock_irqrestore(&runtime->lock, flags);
1102         return count;
1103 }
1104
1105 /**
1106  * snd_rawmidi_transmit - copy from the buffer to the device
1107  * @substream: the rawmidi substream
1108  * @buffer: the buffer pointer
1109  * @count: the data size to transfer
1110  *
1111  * Copies data from the buffer to the device and advances the pointer.
1112  *
1113  * Returns the copied size if successful, or a negative error code on failure.
1114  */
1115 int snd_rawmidi_transmit(snd_rawmidi_substream_t * substream, unsigned char *buffer, int count)
1116 {
1117         count = snd_rawmidi_transmit_peek(substream, buffer, count);
1118         if (count < 0)
1119                 return count;
1120         return snd_rawmidi_transmit_ack(substream, count);
1121 }
1122
1123 static long snd_rawmidi_kernel_write1(snd_rawmidi_substream_t * substream, const unsigned char *buf, long count, int kernel)
1124 {
1125         unsigned long flags;
1126         long count1, result;
1127         snd_rawmidi_runtime_t *runtime = substream->runtime;
1128
1129         snd_assert(buf != NULL, return -EINVAL);
1130         snd_assert(runtime->buffer != NULL, return -EINVAL);
1131
1132         result = 0;
1133         spin_lock_irqsave(&runtime->lock, flags);
1134         if (substream->append) {
1135                 if ((long)runtime->avail < count) {
1136                         spin_unlock_irqrestore(&runtime->lock, flags);
1137                         return -EAGAIN;
1138                 }
1139         }
1140         while (count > 0 && runtime->avail > 0) {
1141                 count1 = runtime->buffer_size - runtime->appl_ptr;
1142                 if (count1 > count)
1143                         count1 = count;
1144                 if (count1 > (long)runtime->avail)
1145                         count1 = runtime->avail;
1146                 if (kernel) {
1147                         memcpy(runtime->buffer + runtime->appl_ptr, buf, count1);
1148                 } else {
1149                         spin_unlock_irqrestore(&runtime->lock, flags);
1150                         if (copy_from_user(runtime->buffer + runtime->appl_ptr,
1151                                            (char __user *)buf, count1)) {
1152                                 spin_lock_irqsave(&runtime->lock, flags);
1153                                 result = result > 0 ? result : -EFAULT;
1154                                 goto __end;
1155                         }
1156                         spin_lock_irqsave(&runtime->lock, flags);
1157                 }
1158                 runtime->appl_ptr += count1;
1159                 runtime->appl_ptr %= runtime->buffer_size;
1160                 runtime->avail -= count1;
1161                 result += count1;
1162                 buf += count1;
1163                 count -= count1;
1164         }
1165       __end:
1166         count1 = runtime->avail < runtime->buffer_size;
1167         spin_unlock_irqrestore(&runtime->lock, flags);
1168         if (count1)
1169                 snd_rawmidi_output_trigger(substream, 1);
1170         return result;
1171 }
1172
1173 long snd_rawmidi_kernel_write(snd_rawmidi_substream_t * substream, const unsigned char *buf, long count)
1174 {
1175         return snd_rawmidi_kernel_write1(substream, buf, count, 1);
1176 }
1177
1178 static ssize_t snd_rawmidi_write(struct file *file, const char __user *buf, size_t count, loff_t *offset)
1179 {
1180         long result, timeout;
1181         int count1;
1182         snd_rawmidi_file_t *rfile;
1183         snd_rawmidi_runtime_t *runtime;
1184         snd_rawmidi_substream_t *substream;
1185
1186         rfile = file->private_data;
1187         substream = rfile->output;
1188         runtime = substream->runtime;
1189         /* we cannot put an atomic message to our buffer */
1190         if (substream->append && count > runtime->buffer_size)
1191                 return -EIO;
1192         result = 0;
1193         while (count > 0) {
1194                 spin_lock_irq(&runtime->lock);
1195                 while (!snd_rawmidi_ready_append(substream, count)) {
1196                         wait_queue_t wait;
1197                         if (file->f_flags & O_NONBLOCK) {
1198                                 spin_unlock_irq(&runtime->lock);
1199                                 return result > 0 ? result : -EAGAIN;
1200                         }
1201                         init_waitqueue_entry(&wait, current);
1202                         add_wait_queue(&runtime->sleep, &wait);
1203                         set_current_state(TASK_INTERRUPTIBLE);
1204                         spin_unlock_irq(&runtime->lock);
1205                         timeout = schedule_timeout(30 * HZ);
1206                         remove_wait_queue(&runtime->sleep, &wait);
1207                         if (signal_pending(current))
1208                                 return result > 0 ? result : -ERESTARTSYS;
1209                         if (!runtime->avail && !timeout)
1210                                 return result > 0 ? result : -EIO;
1211                         spin_lock_irq(&runtime->lock);
1212                 }
1213                 spin_unlock_irq(&runtime->lock);
1214                 count1 = snd_rawmidi_kernel_write1(substream,
1215                                                    (unsigned char __force *)buf,
1216                                                    count, 0);
1217                 if (count1 < 0)
1218                         return result > 0 ? result : count1;
1219                 result += count1;
1220                 buf += count1;
1221                 if ((size_t)count1 < count && (file->f_flags & O_NONBLOCK))
1222                         break;
1223                 count -= count1;
1224         }
1225         if (file->f_flags & O_SYNC) {
1226                 spin_lock_irq(&runtime->lock);
1227                 while (runtime->avail != runtime->buffer_size) {
1228                         wait_queue_t wait;
1229                         unsigned int last_avail = runtime->avail;
1230                         init_waitqueue_entry(&wait, current);
1231                         add_wait_queue(&runtime->sleep, &wait);
1232                         set_current_state(TASK_INTERRUPTIBLE);
1233                         spin_unlock_irq(&runtime->lock);
1234                         timeout = schedule_timeout(30 * HZ);
1235                         remove_wait_queue(&runtime->sleep, &wait);
1236                         if (signal_pending(current))
1237                                 return result > 0 ? result : -ERESTARTSYS;
1238                         if (runtime->avail == last_avail && !timeout)
1239                                 return result > 0 ? result : -EIO;
1240                         spin_lock_irq(&runtime->lock);
1241                 }
1242                 spin_unlock_irq(&runtime->lock);
1243         }
1244         return result;
1245 }
1246
1247 static unsigned int snd_rawmidi_poll(struct file *file, poll_table * wait)
1248 {
1249         snd_rawmidi_file_t *rfile;
1250         snd_rawmidi_runtime_t *runtime;
1251         unsigned int mask;
1252
1253         rfile = file->private_data;
1254         if (rfile->input != NULL) {
1255                 runtime = rfile->input->runtime;
1256                 snd_rawmidi_input_trigger(rfile->input, 1);
1257                 poll_wait(file, &runtime->sleep, wait);
1258         }
1259         if (rfile->output != NULL) {
1260                 runtime = rfile->output->runtime;
1261                 poll_wait(file, &runtime->sleep, wait);
1262         }
1263         mask = 0;
1264         if (rfile->input != NULL) {
1265                 if (snd_rawmidi_ready(rfile->input))
1266                         mask |= POLLIN | POLLRDNORM;
1267         }
1268         if (rfile->output != NULL) {
1269                 if (snd_rawmidi_ready(rfile->output))
1270                         mask |= POLLOUT | POLLWRNORM;
1271         }
1272         return mask;
1273 }
1274
1275 /*
1276  */
1277 #ifdef CONFIG_COMPAT
1278 #include "rawmidi_compat.c"
1279 #else
1280 #define snd_rawmidi_ioctl_compat        NULL
1281 #endif
1282
1283 /*
1284
1285  */
1286
1287 static void snd_rawmidi_proc_info_read(snd_info_entry_t *entry,
1288                                        snd_info_buffer_t * buffer)
1289 {
1290         snd_rawmidi_t *rmidi;
1291         snd_rawmidi_substream_t *substream;
1292         snd_rawmidi_runtime_t *runtime;
1293         struct list_head *list;
1294
1295         rmidi = entry->private_data;
1296         snd_iprintf(buffer, "%s\n\n", rmidi->name);
1297         down(&rmidi->open_mutex);
1298         if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_OUTPUT) {
1299                 list_for_each(list, &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams) {
1300                         substream = list_entry(list, snd_rawmidi_substream_t, list);
1301                         snd_iprintf(buffer,
1302                                     "Output %d\n"
1303                                     "  Tx bytes     : %lu\n",
1304                                     substream->number,
1305                                     (unsigned long) substream->bytes);
1306                         if (substream->opened) {
1307                                 runtime = substream->runtime;
1308                                 snd_iprintf(buffer,
1309                                     "  Mode         : %s\n"
1310                                     "  Buffer size  : %lu\n"
1311                                     "  Avail        : %lu\n",
1312                                     runtime->oss ? "OSS compatible" : "native",
1313                                     (unsigned long) runtime->buffer_size,
1314                                     (unsigned long) runtime->avail);
1315                         }
1316                 }
1317         }
1318         if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_INPUT) {
1319                 list_for_each(list, &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams) {
1320                         substream = list_entry(list, snd_rawmidi_substream_t, list);
1321                         snd_iprintf(buffer,
1322                                     "Input %d\n"
1323                                     "  Rx bytes     : %lu\n",
1324                                     substream->number,
1325                                     (unsigned long) substream->bytes);
1326                         if (substream->opened) {
1327                                 runtime = substream->runtime;
1328                                 snd_iprintf(buffer,
1329                                             "  Buffer size  : %lu\n"
1330                                             "  Avail        : %lu\n"
1331                                             "  Overruns     : %lu\n",
1332                                             (unsigned long) runtime->buffer_size,
1333                                             (unsigned long) runtime->avail,
1334                                             (unsigned long) runtime->xruns);
1335                         }
1336                 }
1337         }
1338         up(&rmidi->open_mutex);
1339 }
1340
1341 /*
1342  *  Register functions
1343  */
1344
1345 static struct file_operations snd_rawmidi_f_ops =
1346 {
1347         .owner =        THIS_MODULE,
1348         .read =         snd_rawmidi_read,
1349         .write =        snd_rawmidi_write,
1350         .open =         snd_rawmidi_open,
1351         .release =      snd_rawmidi_release,
1352         .poll =         snd_rawmidi_poll,
1353         .unlocked_ioctl =       snd_rawmidi_ioctl,
1354         .compat_ioctl = snd_rawmidi_ioctl_compat,
1355 };
1356
1357 static snd_minor_t snd_rawmidi_reg =
1358 {
1359         .comment =      "raw midi",
1360         .f_ops =        &snd_rawmidi_f_ops,
1361 };
1362
1363 static int snd_rawmidi_alloc_substreams(snd_rawmidi_t *rmidi,
1364                                         snd_rawmidi_str_t *stream,
1365                                         int direction,
1366                                         int count)
1367 {
1368         snd_rawmidi_substream_t *substream;
1369         int idx;
1370
1371         INIT_LIST_HEAD(&stream->substreams);
1372         for (idx = 0; idx < count; idx++) {
1373                 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
1374                 if (substream == NULL)
1375                         return -ENOMEM;
1376                 substream->stream = direction;
1377                 substream->number = idx;
1378                 substream->rmidi = rmidi;
1379                 substream->pstr = stream;
1380                 list_add_tail(&substream->list, &stream->substreams);
1381                 stream->substream_count++;
1382         }
1383         return 0;
1384 }
1385
1386 /**
1387  * snd_rawmidi_new - create a rawmidi instance
1388  * @card: the card instance
1389  * @id: the id string
1390  * @device: the device index
1391  * @output_count: the number of output streams
1392  * @input_count: the number of input streams
1393  * @rrawmidi: the pointer to store the new rawmidi instance
1394  *
1395  * Creates a new rawmidi instance.
1396  * Use snd_rawmidi_set_ops() to set the operators to the new instance.
1397  *
1398  * Returns zero if successful, or a negative error code on failure.
1399  */
1400 int snd_rawmidi_new(snd_card_t * card, char *id, int device,
1401                     int output_count, int input_count,
1402                     snd_rawmidi_t ** rrawmidi)
1403 {
1404         snd_rawmidi_t *rmidi;
1405         int err;
1406         static snd_device_ops_t ops = {
1407                 .dev_free = snd_rawmidi_dev_free,
1408                 .dev_register = snd_rawmidi_dev_register,
1409                 .dev_disconnect = snd_rawmidi_dev_disconnect,
1410                 .dev_unregister = snd_rawmidi_dev_unregister
1411         };
1412
1413         snd_assert(rrawmidi != NULL, return -EINVAL);
1414         *rrawmidi = NULL;
1415         snd_assert(card != NULL, return -ENXIO);
1416         rmidi = kzalloc(sizeof(*rmidi), GFP_KERNEL);
1417         if (rmidi == NULL)
1418                 return -ENOMEM;
1419         rmidi->card = card;
1420         rmidi->device = device;
1421         init_MUTEX(&rmidi->open_mutex);
1422         init_waitqueue_head(&rmidi->open_wait);
1423         if (id != NULL)
1424                 strlcpy(rmidi->id, id, sizeof(rmidi->id));
1425         if ((err = snd_rawmidi_alloc_substreams(rmidi, &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT], SNDRV_RAWMIDI_STREAM_INPUT, input_count)) < 0) {
1426                 snd_rawmidi_free(rmidi);
1427                 return err;
1428         }
1429         if ((err = snd_rawmidi_alloc_substreams(rmidi, &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT], SNDRV_RAWMIDI_STREAM_OUTPUT, output_count)) < 0) {
1430                 snd_rawmidi_free(rmidi);
1431                 return err;
1432         }
1433         if ((err = snd_device_new(card, SNDRV_DEV_RAWMIDI, rmidi, &ops)) < 0) {
1434                 snd_rawmidi_free(rmidi);
1435                 return err;
1436         }
1437         *rrawmidi = rmidi;
1438         return 0;
1439 }
1440
1441 static void snd_rawmidi_free_substreams(snd_rawmidi_str_t *stream)
1442 {
1443         snd_rawmidi_substream_t *substream;
1444
1445         while (!list_empty(&stream->substreams)) {
1446                 substream = list_entry(stream->substreams.next, snd_rawmidi_substream_t, list);
1447                 list_del(&substream->list);
1448                 kfree(substream);
1449         }
1450 }
1451
1452 static int snd_rawmidi_free(snd_rawmidi_t *rmidi)
1453 {
1454         snd_assert(rmidi != NULL, return -ENXIO);
1455         snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT]);
1456         snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT]);
1457         if (rmidi->private_free)
1458                 rmidi->private_free(rmidi);
1459         kfree(rmidi);
1460         return 0;
1461 }
1462
1463 static int snd_rawmidi_dev_free(snd_device_t *device)
1464 {
1465         snd_rawmidi_t *rmidi = device->device_data;
1466         return snd_rawmidi_free(rmidi);
1467 }
1468
1469 #if defined(CONFIG_SND_SEQUENCER) || (defined(MODULE) && defined(CONFIG_SND_SEQUENCER_MODULE))
1470 static void snd_rawmidi_dev_seq_free(snd_seq_device_t *device)
1471 {
1472         snd_rawmidi_t *rmidi = device->private_data;
1473         rmidi->seq_dev = NULL;
1474 }
1475 #endif
1476
1477 static int snd_rawmidi_dev_register(snd_device_t *device)
1478 {
1479         int idx, err;
1480         snd_info_entry_t *entry;
1481         char name[16];
1482         snd_rawmidi_t *rmidi = device->device_data;
1483
1484         if (rmidi->device >= SNDRV_RAWMIDI_DEVICES)
1485                 return -ENOMEM;
1486         down(&register_mutex);
1487         idx = (rmidi->card->number * SNDRV_RAWMIDI_DEVICES) + rmidi->device;
1488         if (snd_rawmidi_devices[idx] != NULL) {
1489                 up(&register_mutex);
1490                 return -EBUSY;
1491         }
1492         snd_rawmidi_devices[idx] = rmidi;
1493         sprintf(name, "midiC%iD%i", rmidi->card->number, rmidi->device);
1494         if ((err = snd_register_device(SNDRV_DEVICE_TYPE_RAWMIDI,
1495                                        rmidi->card, rmidi->device,
1496                                        &snd_rawmidi_reg, name)) < 0) {
1497                 snd_printk(KERN_ERR "unable to register rawmidi device %i:%i\n", rmidi->card->number, rmidi->device);
1498                 snd_rawmidi_devices[idx] = NULL;
1499                 up(&register_mutex);
1500                 return err;
1501         }
1502         if (rmidi->ops && rmidi->ops->dev_register &&
1503             (err = rmidi->ops->dev_register(rmidi)) < 0) {
1504                 snd_unregister_device(SNDRV_DEVICE_TYPE_RAWMIDI, rmidi->card, rmidi->device);
1505                 snd_rawmidi_devices[idx] = NULL;
1506                 up(&register_mutex);
1507                 return err;
1508         }
1509 #ifdef CONFIG_SND_OSSEMUL
1510         rmidi->ossreg = 0;
1511         if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1512                 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1513                                             rmidi->card, 0, &snd_rawmidi_reg, name) < 0) {
1514                         snd_printk(KERN_ERR "unable to register OSS rawmidi device %i:%i\n", rmidi->card->number, 0);
1515                 } else {
1516                         rmidi->ossreg++;
1517 #ifdef SNDRV_OSS_INFO_DEV_MIDI
1518                         snd_oss_info_register(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number, rmidi->name);
1519 #endif
1520                 }
1521         }
1522         if ((int)rmidi->device == amidi_map[rmidi->card->number]) {
1523                 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1524                                             rmidi->card, 1, &snd_rawmidi_reg, name) < 0) {
1525                         snd_printk(KERN_ERR "unable to register OSS rawmidi device %i:%i\n", rmidi->card->number, 1);
1526                 } else {
1527                         rmidi->ossreg++;
1528                 }
1529         }
1530 #endif /* CONFIG_SND_OSSEMUL */
1531         up(&register_mutex);
1532         sprintf(name, "midi%d", rmidi->device);
1533         entry = snd_info_create_card_entry(rmidi->card, name, rmidi->card->proc_root);
1534         if (entry) {
1535                 entry->private_data = rmidi;
1536                 entry->c.text.read_size = 1024;
1537                 entry->c.text.read = snd_rawmidi_proc_info_read;
1538                 if (snd_info_register(entry) < 0) {
1539                         snd_info_free_entry(entry);
1540                         entry = NULL;
1541                 }
1542         }
1543         rmidi->proc_entry = entry;
1544 #if defined(CONFIG_SND_SEQUENCER) || (defined(MODULE) && defined(CONFIG_SND_SEQUENCER_MODULE))
1545         if (!rmidi->ops || !rmidi->ops->dev_register) { /* own registration mechanism */
1546                 if (snd_seq_device_new(rmidi->card, rmidi->device, SNDRV_SEQ_DEV_ID_MIDISYNTH, 0, &rmidi->seq_dev) >= 0) {
1547                         rmidi->seq_dev->private_data = rmidi;
1548                         rmidi->seq_dev->private_free = snd_rawmidi_dev_seq_free;
1549                         sprintf(rmidi->seq_dev->name, "MIDI %d-%d", rmidi->card->number, rmidi->device);
1550                         snd_device_register(rmidi->card, rmidi->seq_dev);
1551                 }
1552         }
1553 #endif
1554         return 0;
1555 }
1556
1557 static int snd_rawmidi_dev_disconnect(snd_device_t *device)
1558 {
1559         snd_rawmidi_t *rmidi = device->device_data;
1560         int idx;
1561
1562         down(&register_mutex);
1563         idx = (rmidi->card->number * SNDRV_RAWMIDI_DEVICES) + rmidi->device;
1564         snd_rawmidi_devices[idx] = NULL;
1565         up(&register_mutex);
1566         return 0;
1567 }
1568
1569 static int snd_rawmidi_dev_unregister(snd_device_t *device)
1570 {
1571         int idx;
1572         snd_rawmidi_t *rmidi = device->device_data;
1573
1574         snd_assert(rmidi != NULL, return -ENXIO);
1575         down(&register_mutex);
1576         idx = (rmidi->card->number * SNDRV_RAWMIDI_DEVICES) + rmidi->device;
1577         snd_rawmidi_devices[idx] = NULL;
1578         if (rmidi->proc_entry) {
1579                 snd_info_unregister(rmidi->proc_entry);
1580                 rmidi->proc_entry = NULL;
1581         }
1582 #ifdef CONFIG_SND_OSSEMUL
1583         if (rmidi->ossreg) {
1584                 if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1585                         snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 0);
1586 #ifdef SNDRV_OSS_INFO_DEV_MIDI
1587                         snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number);
1588 #endif
1589                 }
1590                 if ((int)rmidi->device == amidi_map[rmidi->card->number])
1591                         snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 1);
1592                 rmidi->ossreg = 0;
1593         }
1594 #endif /* CONFIG_SND_OSSEMUL */
1595         if (rmidi->ops && rmidi->ops->dev_unregister)
1596                 rmidi->ops->dev_unregister(rmidi);
1597         snd_unregister_device(SNDRV_DEVICE_TYPE_RAWMIDI, rmidi->card, rmidi->device);
1598         up(&register_mutex);
1599 #if defined(CONFIG_SND_SEQUENCER) || (defined(MODULE) && defined(CONFIG_SND_SEQUENCER_MODULE))
1600         if (rmidi->seq_dev) {
1601                 snd_device_free(rmidi->card, rmidi->seq_dev);
1602                 rmidi->seq_dev = NULL;
1603         }
1604 #endif
1605         return snd_rawmidi_free(rmidi);
1606 }
1607
1608 /**
1609  * snd_rawmidi_set_ops - set the rawmidi operators
1610  * @rmidi: the rawmidi instance
1611  * @stream: the stream direction, SNDRV_RAWMIDI_STREAM_XXX
1612  * @ops: the operator table
1613  *
1614  * Sets the rawmidi operators for the given stream direction.
1615  */
1616 void snd_rawmidi_set_ops(snd_rawmidi_t *rmidi, int stream, snd_rawmidi_ops_t *ops)
1617 {
1618         struct list_head *list;
1619         snd_rawmidi_substream_t *substream;
1620
1621         list_for_each(list, &rmidi->streams[stream].substreams) {
1622                 substream = list_entry(list, snd_rawmidi_substream_t, list);
1623                 substream->ops = ops;
1624         }
1625 }
1626
1627 /*
1628  *  ENTRY functions
1629  */
1630
1631 static int __init alsa_rawmidi_init(void)
1632 {
1633
1634         snd_ctl_register_ioctl(snd_rawmidi_control_ioctl);
1635         snd_ctl_register_ioctl_compat(snd_rawmidi_control_ioctl);
1636 #ifdef CONFIG_SND_OSSEMUL
1637         { int i;
1638         /* check device map table */
1639         for (i = 0; i < SNDRV_CARDS; i++) {
1640                 if (midi_map[i] < 0 || midi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1641                         snd_printk(KERN_ERR "invalid midi_map[%d] = %d\n", i, midi_map[i]);
1642                         midi_map[i] = 0;
1643                 }
1644                 if (amidi_map[i] < 0 || amidi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1645                         snd_printk(KERN_ERR "invalid amidi_map[%d] = %d\n", i, amidi_map[i]);
1646                         amidi_map[i] = 1;
1647                 }
1648         }
1649         }
1650 #endif /* CONFIG_SND_OSSEMUL */
1651         return 0;
1652 }
1653
1654 static void __exit alsa_rawmidi_exit(void)
1655 {
1656         snd_ctl_unregister_ioctl(snd_rawmidi_control_ioctl);
1657         snd_ctl_unregister_ioctl_compat(snd_rawmidi_control_ioctl);
1658 }
1659
1660 module_init(alsa_rawmidi_init)
1661 module_exit(alsa_rawmidi_exit)
1662
1663 EXPORT_SYMBOL(snd_rawmidi_output_params);
1664 EXPORT_SYMBOL(snd_rawmidi_input_params);
1665 EXPORT_SYMBOL(snd_rawmidi_drop_output);
1666 EXPORT_SYMBOL(snd_rawmidi_drain_output);
1667 EXPORT_SYMBOL(snd_rawmidi_drain_input);
1668 EXPORT_SYMBOL(snd_rawmidi_receive);
1669 EXPORT_SYMBOL(snd_rawmidi_transmit_empty);
1670 EXPORT_SYMBOL(snd_rawmidi_transmit_peek);
1671 EXPORT_SYMBOL(snd_rawmidi_transmit_ack);
1672 EXPORT_SYMBOL(snd_rawmidi_transmit);
1673 EXPORT_SYMBOL(snd_rawmidi_new);
1674 EXPORT_SYMBOL(snd_rawmidi_set_ops);
1675 EXPORT_SYMBOL(snd_rawmidi_info);
1676 EXPORT_SYMBOL(snd_rawmidi_info_select);
1677 EXPORT_SYMBOL(snd_rawmidi_kernel_open);
1678 EXPORT_SYMBOL(snd_rawmidi_kernel_release);
1679 EXPORT_SYMBOL(snd_rawmidi_kernel_read);
1680 EXPORT_SYMBOL(snd_rawmidi_kernel_write);