linux/sound/core/rawmidi.c
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   1/*
   2 *  Abstract layer for MIDI v1.0 stream
   3 *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
   4 *
   5 *
   6 *   This program is free software; you can redistribute it and/or modify
   7 *   it under the terms of the GNU General Public License as published by
   8 *   the Free Software Foundation; either version 2 of the License, or
   9 *   (at your option) any later version.
  10 *
  11 *   This program is distributed in the hope that it will be useful,
  12 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 *   GNU General Public License for more details.
  15 *
  16 *   You should have received a copy of the GNU General Public License
  17 *   along with this program; if not, write to the Free Software
  18 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  19 *
  20 */
  21
  22#include <sound/core.h>
  23#include <linux/major.h>
  24#include <linux/init.h>
  25#include <linux/sched.h>
  26#include <linux/slab.h>
  27#include <linux/time.h>
  28#include <linux/wait.h>
  29#include <linux/mutex.h>
  30#include <linux/module.h>
  31#include <linux/delay.h>
  32#include <sound/rawmidi.h>
  33#include <sound/info.h>
  34#include <sound/control.h>
  35#include <sound/minors.h>
  36#include <sound/initval.h>
  37
  38MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
  39MODULE_DESCRIPTION("Midlevel RawMidi code for ALSA.");
  40MODULE_LICENSE("GPL");
  41
  42#ifdef CONFIG_SND_OSSEMUL
  43static int midi_map[SNDRV_CARDS];
  44static int amidi_map[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS-1)] = 1};
  45module_param_array(midi_map, int, NULL, 0444);
  46MODULE_PARM_DESC(midi_map, "Raw MIDI device number assigned to 1st OSS device.");
  47module_param_array(amidi_map, int, NULL, 0444);
  48MODULE_PARM_DESC(amidi_map, "Raw MIDI device number assigned to 2nd OSS device.");
  49#endif /* CONFIG_SND_OSSEMUL */
  50
  51static int snd_rawmidi_free(struct snd_rawmidi *rawmidi);
  52static int snd_rawmidi_dev_free(struct snd_device *device);
  53static int snd_rawmidi_dev_register(struct snd_device *device);
  54static int snd_rawmidi_dev_disconnect(struct snd_device *device);
  55
  56static LIST_HEAD(snd_rawmidi_devices);
  57static DEFINE_MUTEX(register_mutex);
  58
  59static struct snd_rawmidi *snd_rawmidi_search(struct snd_card *card, int device)
  60{
  61        struct snd_rawmidi *rawmidi;
  62
  63        list_for_each_entry(rawmidi, &snd_rawmidi_devices, list)
  64                if (rawmidi->card == card && rawmidi->device == device)
  65                        return rawmidi;
  66        return NULL;
  67}
  68
  69static inline unsigned short snd_rawmidi_file_flags(struct file *file)
  70{
  71        switch (file->f_mode & (FMODE_READ | FMODE_WRITE)) {
  72        case FMODE_WRITE:
  73                return SNDRV_RAWMIDI_LFLG_OUTPUT;
  74        case FMODE_READ:
  75                return SNDRV_RAWMIDI_LFLG_INPUT;
  76        default:
  77                return SNDRV_RAWMIDI_LFLG_OPEN;
  78        }
  79}
  80
  81static inline int snd_rawmidi_ready(struct snd_rawmidi_substream *substream)
  82{
  83        struct snd_rawmidi_runtime *runtime = substream->runtime;
  84        return runtime->avail >= runtime->avail_min;
  85}
  86
  87static inline int snd_rawmidi_ready_append(struct snd_rawmidi_substream *substream,
  88                                           size_t count)
  89{
  90        struct snd_rawmidi_runtime *runtime = substream->runtime;
  91        return runtime->avail >= runtime->avail_min &&
  92               (!substream->append || runtime->avail >= count);
  93}
  94
  95static void snd_rawmidi_input_event_work(struct work_struct *work)
  96{
  97        struct snd_rawmidi_runtime *runtime =
  98                container_of(work, struct snd_rawmidi_runtime, event_work);
  99        if (runtime->event)
 100                runtime->event(runtime->substream);
 101}
 102
 103static int snd_rawmidi_runtime_create(struct snd_rawmidi_substream *substream)
 104{
 105        struct snd_rawmidi_runtime *runtime;
 106
 107        if ((runtime = kzalloc(sizeof(*runtime), GFP_KERNEL)) == NULL)
 108                return -ENOMEM;
 109        runtime->substream = substream;
 110        spin_lock_init(&runtime->lock);
 111        init_waitqueue_head(&runtime->sleep);
 112        INIT_WORK(&runtime->event_work, snd_rawmidi_input_event_work);
 113        runtime->event = NULL;
 114        runtime->buffer_size = PAGE_SIZE;
 115        runtime->avail_min = 1;
 116        if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
 117                runtime->avail = 0;
 118        else
 119                runtime->avail = runtime->buffer_size;
 120        if ((runtime->buffer = kmalloc(runtime->buffer_size, GFP_KERNEL)) == NULL) {
 121                kfree(runtime);
 122                return -ENOMEM;
 123        }
 124        runtime->appl_ptr = runtime->hw_ptr = 0;
 125        substream->runtime = runtime;
 126        return 0;
 127}
 128
 129static int snd_rawmidi_runtime_free(struct snd_rawmidi_substream *substream)
 130{
 131        struct snd_rawmidi_runtime *runtime = substream->runtime;
 132
 133        kfree(runtime->buffer);
 134        kfree(runtime);
 135        substream->runtime = NULL;
 136        return 0;
 137}
 138
 139static inline void snd_rawmidi_output_trigger(struct snd_rawmidi_substream *substream,int up)
 140{
 141        if (!substream->opened)
 142                return;
 143        substream->ops->trigger(substream, up);
 144}
 145
 146static void snd_rawmidi_input_trigger(struct snd_rawmidi_substream *substream, int up)
 147{
 148        if (!substream->opened)
 149                return;
 150        substream->ops->trigger(substream, up);
 151        if (!up)
 152                cancel_work_sync(&substream->runtime->event_work);
 153}
 154
 155int snd_rawmidi_drop_output(struct snd_rawmidi_substream *substream)
 156{
 157        unsigned long flags;
 158        struct snd_rawmidi_runtime *runtime = substream->runtime;
 159
 160        snd_rawmidi_output_trigger(substream, 0);
 161        runtime->drain = 0;
 162        spin_lock_irqsave(&runtime->lock, flags);
 163        runtime->appl_ptr = runtime->hw_ptr = 0;
 164        runtime->avail = runtime->buffer_size;
 165        spin_unlock_irqrestore(&runtime->lock, flags);
 166        return 0;
 167}
 168
 169int snd_rawmidi_drain_output(struct snd_rawmidi_substream *substream)
 170{
 171        int err;
 172        long timeout;
 173        struct snd_rawmidi_runtime *runtime = substream->runtime;
 174
 175        err = 0;
 176        runtime->drain = 1;
 177        timeout = wait_event_interruptible_timeout(runtime->sleep,
 178                                (runtime->avail >= runtime->buffer_size),
 179                                10*HZ);
 180        if (signal_pending(current))
 181                err = -ERESTARTSYS;
 182        if (runtime->avail < runtime->buffer_size && !timeout) {
 183                snd_printk(KERN_WARNING "rawmidi drain error (avail = %li, buffer_size = %li)\n", (long)runtime->avail, (long)runtime->buffer_size);
 184                err = -EIO;
 185        }
 186        runtime->drain = 0;
 187        if (err != -ERESTARTSYS) {
 188                /* we need wait a while to make sure that Tx FIFOs are empty */
 189                if (substream->ops->drain)
 190                        substream->ops->drain(substream);
 191                else
 192                        msleep(50);
 193                snd_rawmidi_drop_output(substream);
 194        }
 195        return err;
 196}
 197
 198int snd_rawmidi_drain_input(struct snd_rawmidi_substream *substream)
 199{
 200        unsigned long flags;
 201        struct snd_rawmidi_runtime *runtime = substream->runtime;
 202
 203        snd_rawmidi_input_trigger(substream, 0);
 204        runtime->drain = 0;
 205        spin_lock_irqsave(&runtime->lock, flags);
 206        runtime->appl_ptr = runtime->hw_ptr = 0;
 207        runtime->avail = 0;
 208        spin_unlock_irqrestore(&runtime->lock, flags);
 209        return 0;
 210}
 211
 212/* look for an available substream for the given stream direction;
 213 * if a specific subdevice is given, try to assign it
 214 */
 215static int assign_substream(struct snd_rawmidi *rmidi, int subdevice,
 216                            int stream, int mode,
 217                            struct snd_rawmidi_substream **sub_ret)
 218{
 219        struct snd_rawmidi_substream *substream;
 220        struct snd_rawmidi_str *s = &rmidi->streams[stream];
 221        static unsigned int info_flags[2] = {
 222                [SNDRV_RAWMIDI_STREAM_OUTPUT] = SNDRV_RAWMIDI_INFO_OUTPUT,
 223                [SNDRV_RAWMIDI_STREAM_INPUT] = SNDRV_RAWMIDI_INFO_INPUT,
 224        };
 225
 226        if (!(rmidi->info_flags & info_flags[stream]))
 227                return -ENXIO;
 228        if (subdevice >= 0 && subdevice >= s->substream_count)
 229                return -ENODEV;
 230
 231        list_for_each_entry(substream, &s->substreams, list) {
 232                if (substream->opened) {
 233                        if (stream == SNDRV_RAWMIDI_STREAM_INPUT ||
 234                            !(mode & SNDRV_RAWMIDI_LFLG_APPEND) ||
 235                            !substream->append)
 236                                continue;
 237                }
 238                if (subdevice < 0 || subdevice == substream->number) {
 239                        *sub_ret = substream;
 240                        return 0;
 241                }
 242        }
 243        return -EAGAIN;
 244}
 245
 246/* open and do ref-counting for the given substream */
 247static int open_substream(struct snd_rawmidi *rmidi,
 248                          struct snd_rawmidi_substream *substream,
 249                          int mode)
 250{
 251        int err;
 252
 253        if (substream->use_count == 0) {
 254                err = snd_rawmidi_runtime_create(substream);
 255                if (err < 0)
 256                        return err;
 257                err = substream->ops->open(substream);
 258                if (err < 0) {
 259                        snd_rawmidi_runtime_free(substream);
 260                        return err;
 261                }
 262                substream->opened = 1;
 263                substream->active_sensing = 0;
 264                if (mode & SNDRV_RAWMIDI_LFLG_APPEND)
 265                        substream->append = 1;
 266                substream->pid = get_pid(task_pid(current));
 267                rmidi->streams[substream->stream].substream_opened++;
 268        }
 269        substream->use_count++;
 270        return 0;
 271}
 272
 273static void close_substream(struct snd_rawmidi *rmidi,
 274                            struct snd_rawmidi_substream *substream,
 275                            int cleanup);
 276
 277static int rawmidi_open_priv(struct snd_rawmidi *rmidi, int subdevice, int mode,
 278                             struct snd_rawmidi_file *rfile)
 279{
 280        struct snd_rawmidi_substream *sinput = NULL, *soutput = NULL;
 281        int err;
 282
 283        rfile->input = rfile->output = NULL;
 284        if (mode & SNDRV_RAWMIDI_LFLG_INPUT) {
 285                err = assign_substream(rmidi, subdevice,
 286                                       SNDRV_RAWMIDI_STREAM_INPUT,
 287                                       mode, &sinput);
 288                if (err < 0)
 289                        return err;
 290        }
 291        if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) {
 292                err = assign_substream(rmidi, subdevice,
 293                                       SNDRV_RAWMIDI_STREAM_OUTPUT,
 294                                       mode, &soutput);
 295                if (err < 0)
 296                        return err;
 297        }
 298
 299        if (sinput) {
 300                err = open_substream(rmidi, sinput, mode);
 301                if (err < 0)
 302                        return err;
 303        }
 304        if (soutput) {
 305                err = open_substream(rmidi, soutput, mode);
 306                if (err < 0) {
 307                        if (sinput)
 308                                close_substream(rmidi, sinput, 0);
 309                        return err;
 310                }
 311        }
 312
 313        rfile->rmidi = rmidi;
 314        rfile->input = sinput;
 315        rfile->output = soutput;
 316        return 0;
 317}
 318
 319/* called from sound/core/seq/seq_midi.c */
 320int snd_rawmidi_kernel_open(struct snd_card *card, int device, int subdevice,
 321                            int mode, struct snd_rawmidi_file * rfile)
 322{
 323        struct snd_rawmidi *rmidi;
 324        int err;
 325
 326        if (snd_BUG_ON(!rfile))
 327                return -EINVAL;
 328
 329        mutex_lock(&register_mutex);
 330        rmidi = snd_rawmidi_search(card, device);
 331        if (rmidi == NULL) {
 332                mutex_unlock(&register_mutex);
 333                return -ENODEV;
 334        }
 335        if (!try_module_get(rmidi->card->module)) {
 336                mutex_unlock(&register_mutex);
 337                return -ENXIO;
 338        }
 339        mutex_unlock(&register_mutex);
 340
 341        mutex_lock(&rmidi->open_mutex);
 342        err = rawmidi_open_priv(rmidi, subdevice, mode, rfile);
 343        mutex_unlock(&rmidi->open_mutex);
 344        if (err < 0)
 345                module_put(rmidi->card->module);
 346        return err;
 347}
 348
 349static int snd_rawmidi_open(struct inode *inode, struct file *file)
 350{
 351        int maj = imajor(inode);
 352        struct snd_card *card;
 353        int subdevice;
 354        unsigned short fflags;
 355        int err;
 356        struct snd_rawmidi *rmidi;
 357        struct snd_rawmidi_file *rawmidi_file = NULL;
 358        wait_queue_t wait;
 359        struct snd_ctl_file *kctl;
 360
 361        if ((file->f_flags & O_APPEND) && !(file->f_flags & O_NONBLOCK)) 
 362                return -EINVAL;         /* invalid combination */
 363
 364        err = nonseekable_open(inode, file);
 365        if (err < 0)
 366                return err;
 367
 368        if (maj == snd_major) {
 369                rmidi = snd_lookup_minor_data(iminor(inode),
 370                                              SNDRV_DEVICE_TYPE_RAWMIDI);
 371#ifdef CONFIG_SND_OSSEMUL
 372        } else if (maj == SOUND_MAJOR) {
 373                rmidi = snd_lookup_oss_minor_data(iminor(inode),
 374                                                  SNDRV_OSS_DEVICE_TYPE_MIDI);
 375#endif
 376        } else
 377                return -ENXIO;
 378
 379        if (rmidi == NULL)
 380                return -ENODEV;
 381
 382        if (!try_module_get(rmidi->card->module))
 383                return -ENXIO;
 384
 385        mutex_lock(&rmidi->open_mutex);
 386        card = rmidi->card;
 387        err = snd_card_file_add(card, file);
 388        if (err < 0)
 389                goto __error_card;
 390        fflags = snd_rawmidi_file_flags(file);
 391        if ((file->f_flags & O_APPEND) || maj == SOUND_MAJOR) /* OSS emul? */
 392                fflags |= SNDRV_RAWMIDI_LFLG_APPEND;
 393        rawmidi_file = kmalloc(sizeof(*rawmidi_file), GFP_KERNEL);
 394        if (rawmidi_file == NULL) {
 395                err = -ENOMEM;
 396                goto __error;
 397        }
 398        init_waitqueue_entry(&wait, current);
 399        add_wait_queue(&rmidi->open_wait, &wait);
 400        while (1) {
 401                subdevice = -1;
 402                read_lock(&card->ctl_files_rwlock);
 403                list_for_each_entry(kctl, &card->ctl_files, list) {
 404                        if (kctl->pid == task_pid(current)) {
 405                                subdevice = kctl->prefer_rawmidi_subdevice;
 406                                if (subdevice != -1)
 407                                        break;
 408                        }
 409                }
 410                read_unlock(&card->ctl_files_rwlock);
 411                err = rawmidi_open_priv(rmidi, subdevice, fflags, rawmidi_file);
 412                if (err >= 0)
 413                        break;
 414                if (err == -EAGAIN) {
 415                        if (file->f_flags & O_NONBLOCK) {
 416                                err = -EBUSY;
 417                                break;
 418                        }
 419                } else
 420                        break;
 421                set_current_state(TASK_INTERRUPTIBLE);
 422                mutex_unlock(&rmidi->open_mutex);
 423                schedule();
 424                mutex_lock(&rmidi->open_mutex);
 425                if (signal_pending(current)) {
 426                        err = -ERESTARTSYS;
 427                        break;
 428                }
 429        }
 430        remove_wait_queue(&rmidi->open_wait, &wait);
 431        if (err < 0) {
 432                kfree(rawmidi_file);
 433                goto __error;
 434        }
 435#ifdef CONFIG_SND_OSSEMUL
 436        if (rawmidi_file->input && rawmidi_file->input->runtime)
 437                rawmidi_file->input->runtime->oss = (maj == SOUND_MAJOR);
 438        if (rawmidi_file->output && rawmidi_file->output->runtime)
 439                rawmidi_file->output->runtime->oss = (maj == SOUND_MAJOR);
 440#endif
 441        file->private_data = rawmidi_file;
 442        mutex_unlock(&rmidi->open_mutex);
 443        return 0;
 444
 445 __error:
 446        snd_card_file_remove(card, file);
 447 __error_card:
 448        mutex_unlock(&rmidi->open_mutex);
 449        module_put(rmidi->card->module);
 450        return err;
 451}
 452
 453static void close_substream(struct snd_rawmidi *rmidi,
 454                            struct snd_rawmidi_substream *substream,
 455                            int cleanup)
 456{
 457        if (--substream->use_count)
 458                return;
 459
 460        if (cleanup) {
 461                if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
 462                        snd_rawmidi_input_trigger(substream, 0);
 463                else {
 464                        if (substream->active_sensing) {
 465                                unsigned char buf = 0xfe;
 466                                /* sending single active sensing message
 467                                 * to shut the device up
 468                                 */
 469                                snd_rawmidi_kernel_write(substream, &buf, 1);
 470                        }
 471                        if (snd_rawmidi_drain_output(substream) == -ERESTARTSYS)
 472                                snd_rawmidi_output_trigger(substream, 0);
 473                }
 474        }
 475        substream->ops->close(substream);
 476        if (substream->runtime->private_free)
 477                substream->runtime->private_free(substream);
 478        snd_rawmidi_runtime_free(substream);
 479        substream->opened = 0;
 480        substream->append = 0;
 481        put_pid(substream->pid);
 482        substream->pid = NULL;
 483        rmidi->streams[substream->stream].substream_opened--;
 484}
 485
 486static void rawmidi_release_priv(struct snd_rawmidi_file *rfile)
 487{
 488        struct snd_rawmidi *rmidi;
 489
 490        rmidi = rfile->rmidi;
 491        mutex_lock(&rmidi->open_mutex);
 492        if (rfile->input) {
 493                close_substream(rmidi, rfile->input, 1);
 494                rfile->input = NULL;
 495        }
 496        if (rfile->output) {
 497                close_substream(rmidi, rfile->output, 1);
 498                rfile->output = NULL;
 499        }
 500        rfile->rmidi = NULL;
 501        mutex_unlock(&rmidi->open_mutex);
 502        wake_up(&rmidi->open_wait);
 503}
 504
 505/* called from sound/core/seq/seq_midi.c */
 506int snd_rawmidi_kernel_release(struct snd_rawmidi_file *rfile)
 507{
 508        struct snd_rawmidi *rmidi;
 509
 510        if (snd_BUG_ON(!rfile))
 511                return -ENXIO;
 512        
 513        rmidi = rfile->rmidi;
 514        rawmidi_release_priv(rfile);
 515        module_put(rmidi->card->module);
 516        return 0;
 517}
 518
 519static int snd_rawmidi_release(struct inode *inode, struct file *file)
 520{
 521        struct snd_rawmidi_file *rfile;
 522        struct snd_rawmidi *rmidi;
 523        struct module *module;
 524
 525        rfile = file->private_data;
 526        rmidi = rfile->rmidi;
 527        rawmidi_release_priv(rfile);
 528        kfree(rfile);
 529        module = rmidi->card->module;
 530        snd_card_file_remove(rmidi->card, file);
 531        module_put(module);
 532        return 0;
 533}
 534
 535static int snd_rawmidi_info(struct snd_rawmidi_substream *substream,
 536                            struct snd_rawmidi_info *info)
 537{
 538        struct snd_rawmidi *rmidi;
 539        
 540        if (substream == NULL)
 541                return -ENODEV;
 542        rmidi = substream->rmidi;
 543        memset(info, 0, sizeof(*info));
 544        info->card = rmidi->card->number;
 545        info->device = rmidi->device;
 546        info->subdevice = substream->number;
 547        info->stream = substream->stream;
 548        info->flags = rmidi->info_flags;
 549        strcpy(info->id, rmidi->id);
 550        strcpy(info->name, rmidi->name);
 551        strcpy(info->subname, substream->name);
 552        info->subdevices_count = substream->pstr->substream_count;
 553        info->subdevices_avail = (substream->pstr->substream_count -
 554                                  substream->pstr->substream_opened);
 555        return 0;
 556}
 557
 558static int snd_rawmidi_info_user(struct snd_rawmidi_substream *substream,
 559                                 struct snd_rawmidi_info __user * _info)
 560{
 561        struct snd_rawmidi_info info;
 562        int err;
 563        if ((err = snd_rawmidi_info(substream, &info)) < 0)
 564                return err;
 565        if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
 566                return -EFAULT;
 567        return 0;
 568}
 569
 570int snd_rawmidi_info_select(struct snd_card *card, struct snd_rawmidi_info *info)
 571{
 572        struct snd_rawmidi *rmidi;
 573        struct snd_rawmidi_str *pstr;
 574        struct snd_rawmidi_substream *substream;
 575
 576        mutex_lock(&register_mutex);
 577        rmidi = snd_rawmidi_search(card, info->device);
 578        mutex_unlock(&register_mutex);
 579        if (!rmidi)
 580                return -ENXIO;
 581        if (info->stream < 0 || info->stream > 1)
 582                return -EINVAL;
 583        pstr = &rmidi->streams[info->stream];
 584        if (pstr->substream_count == 0)
 585                return -ENOENT;
 586        if (info->subdevice >= pstr->substream_count)
 587                return -ENXIO;
 588        list_for_each_entry(substream, &pstr->substreams, list) {
 589                if ((unsigned int)substream->number == info->subdevice)
 590                        return snd_rawmidi_info(substream, info);
 591        }
 592        return -ENXIO;
 593}
 594
 595static int snd_rawmidi_info_select_user(struct snd_card *card,
 596                                        struct snd_rawmidi_info __user *_info)
 597{
 598        int err;
 599        struct snd_rawmidi_info info;
 600        if (get_user(info.device, &_info->device))
 601                return -EFAULT;
 602        if (get_user(info.stream, &_info->stream))
 603                return -EFAULT;
 604        if (get_user(info.subdevice, &_info->subdevice))
 605                return -EFAULT;
 606        if ((err = snd_rawmidi_info_select(card, &info)) < 0)
 607                return err;
 608        if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
 609                return -EFAULT;
 610        return 0;
 611}
 612
 613int snd_rawmidi_output_params(struct snd_rawmidi_substream *substream,
 614                              struct snd_rawmidi_params * params)
 615{
 616        char *newbuf;
 617        struct snd_rawmidi_runtime *runtime = substream->runtime;
 618        
 619        if (substream->append && substream->use_count > 1)
 620                return -EBUSY;
 621        snd_rawmidi_drain_output(substream);
 622        if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L) {
 623                return -EINVAL;
 624        }
 625        if (params->avail_min < 1 || params->avail_min > params->buffer_size) {
 626                return -EINVAL;
 627        }
 628        if (params->buffer_size != runtime->buffer_size) {
 629                newbuf = krealloc(runtime->buffer, params->buffer_size,
 630                                  GFP_KERNEL);
 631                if (!newbuf)
 632                        return -ENOMEM;
 633                runtime->buffer = newbuf;
 634                runtime->buffer_size = params->buffer_size;
 635                runtime->avail = runtime->buffer_size;
 636        }
 637        runtime->avail_min = params->avail_min;
 638        substream->active_sensing = !params->no_active_sensing;
 639        return 0;
 640}
 641
 642int snd_rawmidi_input_params(struct snd_rawmidi_substream *substream,
 643                             struct snd_rawmidi_params * params)
 644{
 645        char *newbuf;
 646        struct snd_rawmidi_runtime *runtime = substream->runtime;
 647
 648        snd_rawmidi_drain_input(substream);
 649        if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L) {
 650                return -EINVAL;
 651        }
 652        if (params->avail_min < 1 || params->avail_min > params->buffer_size) {
 653                return -EINVAL;
 654        }
 655        if (params->buffer_size != runtime->buffer_size) {
 656                newbuf = krealloc(runtime->buffer, params->buffer_size,
 657                                  GFP_KERNEL);
 658                if (!newbuf)
 659                        return -ENOMEM;
 660                runtime->buffer = newbuf;
 661                runtime->buffer_size = params->buffer_size;
 662        }
 663        runtime->avail_min = params->avail_min;
 664        return 0;
 665}
 666
 667static int snd_rawmidi_output_status(struct snd_rawmidi_substream *substream,
 668                                     struct snd_rawmidi_status * status)
 669{
 670        struct snd_rawmidi_runtime *runtime = substream->runtime;
 671
 672        memset(status, 0, sizeof(*status));
 673        status->stream = SNDRV_RAWMIDI_STREAM_OUTPUT;
 674        spin_lock_irq(&runtime->lock);
 675        status->avail = runtime->avail;
 676        spin_unlock_irq(&runtime->lock);
 677        return 0;
 678}
 679
 680static int snd_rawmidi_input_status(struct snd_rawmidi_substream *substream,
 681                                    struct snd_rawmidi_status * status)
 682{
 683        struct snd_rawmidi_runtime *runtime = substream->runtime;
 684
 685        memset(status, 0, sizeof(*status));
 686        status->stream = SNDRV_RAWMIDI_STREAM_INPUT;
 687        spin_lock_irq(&runtime->lock);
 688        status->avail = runtime->avail;
 689        status->xruns = runtime->xruns;
 690        runtime->xruns = 0;
 691        spin_unlock_irq(&runtime->lock);
 692        return 0;
 693}
 694
 695static long snd_rawmidi_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 696{
 697        struct snd_rawmidi_file *rfile;
 698        void __user *argp = (void __user *)arg;
 699
 700        rfile = file->private_data;
 701        if (((cmd >> 8) & 0xff) != 'W')
 702                return -ENOTTY;
 703        switch (cmd) {
 704        case SNDRV_RAWMIDI_IOCTL_PVERSION:
 705                return put_user(SNDRV_RAWMIDI_VERSION, (int __user *)argp) ? -EFAULT : 0;
 706        case SNDRV_RAWMIDI_IOCTL_INFO:
 707        {
 708                int stream;
 709                struct snd_rawmidi_info __user *info = argp;
 710                if (get_user(stream, &info->stream))
 711                        return -EFAULT;
 712                switch (stream) {
 713                case SNDRV_RAWMIDI_STREAM_INPUT:
 714                        return snd_rawmidi_info_user(rfile->input, info);
 715                case SNDRV_RAWMIDI_STREAM_OUTPUT:
 716                        return snd_rawmidi_info_user(rfile->output, info);
 717                default:
 718                        return -EINVAL;
 719                }
 720        }
 721        case SNDRV_RAWMIDI_IOCTL_PARAMS:
 722        {
 723                struct snd_rawmidi_params params;
 724                if (copy_from_user(&params, argp, sizeof(struct snd_rawmidi_params)))
 725                        return -EFAULT;
 726                switch (params.stream) {
 727                case SNDRV_RAWMIDI_STREAM_OUTPUT:
 728                        if (rfile->output == NULL)
 729                                return -EINVAL;
 730                        return snd_rawmidi_output_params(rfile->output, &params);
 731                case SNDRV_RAWMIDI_STREAM_INPUT:
 732                        if (rfile->input == NULL)
 733                                return -EINVAL;
 734                        return snd_rawmidi_input_params(rfile->input, &params);
 735                default:
 736                        return -EINVAL;
 737                }
 738        }
 739        case SNDRV_RAWMIDI_IOCTL_STATUS:
 740        {
 741                int err = 0;
 742                struct snd_rawmidi_status status;
 743                if (copy_from_user(&status, argp, sizeof(struct snd_rawmidi_status)))
 744                        return -EFAULT;
 745                switch (status.stream) {
 746                case SNDRV_RAWMIDI_STREAM_OUTPUT:
 747                        if (rfile->output == NULL)
 748                                return -EINVAL;
 749                        err = snd_rawmidi_output_status(rfile->output, &status);
 750                        break;
 751                case SNDRV_RAWMIDI_STREAM_INPUT:
 752                        if (rfile->input == NULL)
 753                                return -EINVAL;
 754                        err = snd_rawmidi_input_status(rfile->input, &status);
 755                        break;
 756                default:
 757                        return -EINVAL;
 758                }
 759                if (err < 0)
 760                        return err;
 761                if (copy_to_user(argp, &status, sizeof(struct snd_rawmidi_status)))
 762                        return -EFAULT;
 763                return 0;
 764        }
 765        case SNDRV_RAWMIDI_IOCTL_DROP:
 766        {
 767                int val;
 768                if (get_user(val, (int __user *) argp))
 769                        return -EFAULT;
 770                switch (val) {
 771                case SNDRV_RAWMIDI_STREAM_OUTPUT:
 772                        if (rfile->output == NULL)
 773                                return -EINVAL;
 774                        return snd_rawmidi_drop_output(rfile->output);
 775                default:
 776                        return -EINVAL;
 777                }
 778        }
 779        case SNDRV_RAWMIDI_IOCTL_DRAIN:
 780        {
 781                int val;
 782                if (get_user(val, (int __user *) argp))
 783                        return -EFAULT;
 784                switch (val) {
 785                case SNDRV_RAWMIDI_STREAM_OUTPUT:
 786                        if (rfile->output == NULL)
 787                                return -EINVAL;
 788                        return snd_rawmidi_drain_output(rfile->output);
 789                case SNDRV_RAWMIDI_STREAM_INPUT:
 790                        if (rfile->input == NULL)
 791                                return -EINVAL;
 792                        return snd_rawmidi_drain_input(rfile->input);
 793                default:
 794                        return -EINVAL;
 795                }
 796        }
 797#ifdef CONFIG_SND_DEBUG
 798        default:
 799                snd_printk(KERN_WARNING "rawmidi: unknown command = 0x%x\n", cmd);
 800#endif
 801        }
 802        return -ENOTTY;
 803}
 804
 805static int snd_rawmidi_control_ioctl(struct snd_card *card,
 806                                     struct snd_ctl_file *control,
 807                                     unsigned int cmd,
 808                                     unsigned long arg)
 809{
 810        void __user *argp = (void __user *)arg;
 811
 812        switch (cmd) {
 813        case SNDRV_CTL_IOCTL_RAWMIDI_NEXT_DEVICE:
 814        {
 815                int device;
 816                
 817                if (get_user(device, (int __user *)argp))
 818                        return -EFAULT;
 819                if (device >= SNDRV_RAWMIDI_DEVICES) /* next device is -1 */
 820                        device = SNDRV_RAWMIDI_DEVICES - 1;
 821                mutex_lock(&register_mutex);
 822                device = device < 0 ? 0 : device + 1;
 823                while (device < SNDRV_RAWMIDI_DEVICES) {
 824                        if (snd_rawmidi_search(card, device))
 825                                break;
 826                        device++;
 827                }
 828                if (device == SNDRV_RAWMIDI_DEVICES)
 829                        device = -1;
 830                mutex_unlock(&register_mutex);
 831                if (put_user(device, (int __user *)argp))
 832                        return -EFAULT;
 833                return 0;
 834        }
 835        case SNDRV_CTL_IOCTL_RAWMIDI_PREFER_SUBDEVICE:
 836        {
 837                int val;
 838                
 839                if (get_user(val, (int __user *)argp))
 840                        return -EFAULT;
 841                control->prefer_rawmidi_subdevice = val;
 842                return 0;
 843        }
 844        case SNDRV_CTL_IOCTL_RAWMIDI_INFO:
 845                return snd_rawmidi_info_select_user(card, argp);
 846        }
 847        return -ENOIOCTLCMD;
 848}
 849
 850/**
 851 * snd_rawmidi_receive - receive the input data from the device
 852 * @substream: the rawmidi substream
 853 * @buffer: the buffer pointer
 854 * @count: the data size to read
 855 *
 856 * Reads the data from the internal buffer.
 857 *
 858 * Returns the size of read data, or a negative error code on failure.
 859 */
 860int snd_rawmidi_receive(struct snd_rawmidi_substream *substream,
 861                        const unsigned char *buffer, int count)
 862{
 863        unsigned long flags;
 864        int result = 0, count1;
 865        struct snd_rawmidi_runtime *runtime = substream->runtime;
 866
 867        if (!substream->opened)
 868                return -EBADFD;
 869        if (runtime->buffer == NULL) {
 870                snd_printd("snd_rawmidi_receive: input is not active!!!\n");
 871                return -EINVAL;
 872        }
 873        spin_lock_irqsave(&runtime->lock, flags);
 874        if (count == 1) {       /* special case, faster code */
 875                substream->bytes++;
 876                if (runtime->avail < runtime->buffer_size) {
 877                        runtime->buffer[runtime->hw_ptr++] = buffer[0];
 878                        runtime->hw_ptr %= runtime->buffer_size;
 879                        runtime->avail++;
 880                        result++;
 881                } else {
 882                        runtime->xruns++;
 883                }
 884        } else {
 885                substream->bytes += count;
 886                count1 = runtime->buffer_size - runtime->hw_ptr;
 887                if (count1 > count)
 888                        count1 = count;
 889                if (count1 > (int)(runtime->buffer_size - runtime->avail))
 890                        count1 = runtime->buffer_size - runtime->avail;
 891                memcpy(runtime->buffer + runtime->hw_ptr, buffer, count1);
 892                runtime->hw_ptr += count1;
 893                runtime->hw_ptr %= runtime->buffer_size;
 894                runtime->avail += count1;
 895                count -= count1;
 896                result += count1;
 897                if (count > 0) {
 898                        buffer += count1;
 899                        count1 = count;
 900                        if (count1 > (int)(runtime->buffer_size - runtime->avail)) {
 901                                count1 = runtime->buffer_size - runtime->avail;
 902                                runtime->xruns += count - count1;
 903                        }
 904                        if (count1 > 0) {
 905                                memcpy(runtime->buffer, buffer, count1);
 906                                runtime->hw_ptr = count1;
 907                                runtime->avail += count1;
 908                                result += count1;
 909                        }
 910                }
 911        }
 912        if (result > 0) {
 913                if (runtime->event)
 914                        schedule_work(&runtime->event_work);
 915                else if (snd_rawmidi_ready(substream))
 916                        wake_up(&runtime->sleep);
 917        }
 918        spin_unlock_irqrestore(&runtime->lock, flags);
 919        return result;
 920}
 921
 922static long snd_rawmidi_kernel_read1(struct snd_rawmidi_substream *substream,
 923                                     unsigned char __user *userbuf,
 924                                     unsigned char *kernelbuf, long count)
 925{
 926        unsigned long flags;
 927        long result = 0, count1;
 928        struct snd_rawmidi_runtime *runtime = substream->runtime;
 929
 930        while (count > 0 && runtime->avail) {
 931                count1 = runtime->buffer_size - runtime->appl_ptr;
 932                if (count1 > count)
 933                        count1 = count;
 934                spin_lock_irqsave(&runtime->lock, flags);
 935                if (count1 > (int)runtime->avail)
 936                        count1 = runtime->avail;
 937                if (kernelbuf)
 938                        memcpy(kernelbuf + result, runtime->buffer + runtime->appl_ptr, count1);
 939                if (userbuf) {
 940                        spin_unlock_irqrestore(&runtime->lock, flags);
 941                        if (copy_to_user(userbuf + result,
 942                                         runtime->buffer + runtime->appl_ptr, count1)) {
 943                                return result > 0 ? result : -EFAULT;
 944                        }
 945                        spin_lock_irqsave(&runtime->lock, flags);
 946                }
 947                runtime->appl_ptr += count1;
 948                runtime->appl_ptr %= runtime->buffer_size;
 949                runtime->avail -= count1;
 950                spin_unlock_irqrestore(&runtime->lock, flags);
 951                result += count1;
 952                count -= count1;
 953        }
 954        return result;
 955}
 956
 957long snd_rawmidi_kernel_read(struct snd_rawmidi_substream *substream,
 958                             unsigned char *buf, long count)
 959{
 960        snd_rawmidi_input_trigger(substream, 1);
 961        return snd_rawmidi_kernel_read1(substream, NULL/*userbuf*/, buf, count);
 962}
 963
 964static ssize_t snd_rawmidi_read(struct file *file, char __user *buf, size_t count,
 965                                loff_t *offset)
 966{
 967        long result;
 968        int count1;
 969        struct snd_rawmidi_file *rfile;
 970        struct snd_rawmidi_substream *substream;
 971        struct snd_rawmidi_runtime *runtime;
 972
 973        rfile = file->private_data;
 974        substream = rfile->input;
 975        if (substream == NULL)
 976                return -EIO;
 977        runtime = substream->runtime;
 978        snd_rawmidi_input_trigger(substream, 1);
 979        result = 0;
 980        while (count > 0) {
 981                spin_lock_irq(&runtime->lock);
 982                while (!snd_rawmidi_ready(substream)) {
 983                        wait_queue_t wait;
 984                        if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
 985                                spin_unlock_irq(&runtime->lock);
 986                                return result > 0 ? result : -EAGAIN;
 987                        }
 988                        init_waitqueue_entry(&wait, current);
 989                        add_wait_queue(&runtime->sleep, &wait);
 990                        set_current_state(TASK_INTERRUPTIBLE);
 991                        spin_unlock_irq(&runtime->lock);
 992                        schedule();
 993                        remove_wait_queue(&runtime->sleep, &wait);
 994                        if (signal_pending(current))
 995                                return result > 0 ? result : -ERESTARTSYS;
 996                        if (!runtime->avail)
 997                                return result > 0 ? result : -EIO;
 998                        spin_lock_irq(&runtime->lock);
 999                }
1000                spin_unlock_irq(&runtime->lock);
1001                count1 = snd_rawmidi_kernel_read1(substream,
1002                                                  (unsigned char __user *)buf,
1003                                                  NULL/*kernelbuf*/,
1004                                                  count);
1005                if (count1 < 0)
1006                        return result > 0 ? result : count1;
1007                result += count1;
1008                buf += count1;
1009                count -= count1;
1010        }
1011        return result;
1012}
1013
1014/**
1015 * snd_rawmidi_transmit_empty - check whether the output buffer is empty
1016 * @substream: the rawmidi substream
1017 * 
1018 * Returns 1 if the internal output buffer is empty, 0 if not.
1019 */
1020int snd_rawmidi_transmit_empty(struct snd_rawmidi_substream *substream)
1021{
1022        struct snd_rawmidi_runtime *runtime = substream->runtime;
1023        int result;
1024        unsigned long flags;
1025
1026        if (runtime->buffer == NULL) {
1027                snd_printd("snd_rawmidi_transmit_empty: output is not active!!!\n");
1028                return 1;
1029        }
1030        spin_lock_irqsave(&runtime->lock, flags);
1031        result = runtime->avail >= runtime->buffer_size;
1032        spin_unlock_irqrestore(&runtime->lock, flags);
1033        return result;          
1034}
1035
1036/**
1037 * snd_rawmidi_transmit_peek - copy data from the internal buffer
1038 * @substream: the rawmidi substream
1039 * @buffer: the buffer pointer
1040 * @count: data size to transfer
1041 *
1042 * Copies data from the internal output buffer to the given buffer.
1043 *
1044 * Call this in the interrupt handler when the midi output is ready,
1045 * and call snd_rawmidi_transmit_ack() after the transmission is
1046 * finished.
1047 *
1048 * Returns the size of copied data, or a negative error code on failure.
1049 */
1050int snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
1051                              unsigned char *buffer, int count)
1052{
1053        unsigned long flags;
1054        int result, count1;
1055        struct snd_rawmidi_runtime *runtime = substream->runtime;
1056
1057        if (runtime->buffer == NULL) {
1058                snd_printd("snd_rawmidi_transmit_peek: output is not active!!!\n");
1059                return -EINVAL;
1060        }
1061        result = 0;
1062        spin_lock_irqsave(&runtime->lock, flags);
1063        if (runtime->avail >= runtime->buffer_size) {
1064                /* warning: lowlevel layer MUST trigger down the hardware */
1065                goto __skip;
1066        }
1067        if (count == 1) {       /* special case, faster code */
1068                *buffer = runtime->buffer[runtime->hw_ptr];
1069                result++;
1070        } else {
1071                count1 = runtime->buffer_size - runtime->hw_ptr;
1072                if (count1 > count)
1073                        count1 = count;
1074                if (count1 > (int)(runtime->buffer_size - runtime->avail))
1075                        count1 = runtime->buffer_size - runtime->avail;
1076                memcpy(buffer, runtime->buffer + runtime->hw_ptr, count1);
1077                count -= count1;
1078                result += count1;
1079                if (count > 0) {
1080                        if (count > (int)(runtime->buffer_size - runtime->avail - count1))
1081                                count = runtime->buffer_size - runtime->avail - count1;
1082                        memcpy(buffer + count1, runtime->buffer, count);
1083                        result += count;
1084                }
1085        }
1086      __skip:
1087        spin_unlock_irqrestore(&runtime->lock, flags);
1088        return result;
1089}
1090
1091/**
1092 * snd_rawmidi_transmit_ack - acknowledge the transmission
1093 * @substream: the rawmidi substream
1094 * @count: the tranferred count
1095 *
1096 * Advances the hardware pointer for the internal output buffer with
1097 * the given size and updates the condition.
1098 * Call after the transmission is finished.
1099 *
1100 * Returns the advanced size if successful, or a negative error code on failure.
1101 */
1102int snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count)
1103{
1104        unsigned long flags;
1105        struct snd_rawmidi_runtime *runtime = substream->runtime;
1106
1107        if (runtime->buffer == NULL) {
1108                snd_printd("snd_rawmidi_transmit_ack: output is not active!!!\n");
1109                return -EINVAL;
1110        }
1111        spin_lock_irqsave(&runtime->lock, flags);
1112        snd_BUG_ON(runtime->avail + count > runtime->buffer_size);
1113        runtime->hw_ptr += count;
1114        runtime->hw_ptr %= runtime->buffer_size;
1115        runtime->avail += count;
1116        substream->bytes += count;
1117        if (count > 0) {
1118                if (runtime->drain || snd_rawmidi_ready(substream))
1119                        wake_up(&runtime->sleep);
1120        }
1121        spin_unlock_irqrestore(&runtime->lock, flags);
1122        return count;
1123}
1124
1125/**
1126 * snd_rawmidi_transmit - copy from the buffer to the device
1127 * @substream: the rawmidi substream
1128 * @buffer: the buffer pointer
1129 * @count: the data size to transfer
1130 * 
1131 * Copies data from the buffer to the device and advances the pointer.
1132 *
1133 * Returns the copied size if successful, or a negative error code on failure.
1134 */
1135int snd_rawmidi_transmit(struct snd_rawmidi_substream *substream,
1136                         unsigned char *buffer, int count)
1137{
1138        if (!substream->opened)
1139                return -EBADFD;
1140        count = snd_rawmidi_transmit_peek(substream, buffer, count);
1141        if (count < 0)
1142                return count;
1143        return snd_rawmidi_transmit_ack(substream, count);
1144}
1145
1146static long snd_rawmidi_kernel_write1(struct snd_rawmidi_substream *substream,
1147                                      const unsigned char __user *userbuf,
1148                                      const unsigned char *kernelbuf,
1149                                      long count)
1150{
1151        unsigned long flags;
1152        long count1, result;
1153        struct snd_rawmidi_runtime *runtime = substream->runtime;
1154
1155        if (snd_BUG_ON(!kernelbuf && !userbuf))
1156                return -EINVAL;
1157        if (snd_BUG_ON(!runtime->buffer))
1158                return -EINVAL;
1159
1160        result = 0;
1161        spin_lock_irqsave(&runtime->lock, flags);
1162        if (substream->append) {
1163                if ((long)runtime->avail < count) {
1164                        spin_unlock_irqrestore(&runtime->lock, flags);
1165                        return -EAGAIN;
1166                }
1167        }
1168        while (count > 0 && runtime->avail > 0) {
1169                count1 = runtime->buffer_size - runtime->appl_ptr;
1170                if (count1 > count)
1171                        count1 = count;
1172                if (count1 > (long)runtime->avail)
1173                        count1 = runtime->avail;
1174                if (kernelbuf)
1175                        memcpy(runtime->buffer + runtime->appl_ptr,
1176                               kernelbuf + result, count1);
1177                else if (userbuf) {
1178                        spin_unlock_irqrestore(&runtime->lock, flags);
1179                        if (copy_from_user(runtime->buffer + runtime->appl_ptr,
1180                                           userbuf + result, count1)) {
1181                                spin_lock_irqsave(&runtime->lock, flags);
1182                                result = result > 0 ? result : -EFAULT;
1183                                goto __end;
1184                        }
1185                        spin_lock_irqsave(&runtime->lock, flags);
1186                }
1187                runtime->appl_ptr += count1;
1188                runtime->appl_ptr %= runtime->buffer_size;
1189                runtime->avail -= count1;
1190                result += count1;
1191                count -= count1;
1192        }
1193      __end:
1194        count1 = runtime->avail < runtime->buffer_size;
1195        spin_unlock_irqrestore(&runtime->lock, flags);
1196        if (count1)
1197                snd_rawmidi_output_trigger(substream, 1);
1198        return result;
1199}
1200
1201long snd_rawmidi_kernel_write(struct snd_rawmidi_substream *substream,
1202                              const unsigned char *buf, long count)
1203{
1204        return snd_rawmidi_kernel_write1(substream, NULL, buf, count);
1205}
1206
1207static ssize_t snd_rawmidi_write(struct file *file, const char __user *buf,
1208                                 size_t count, loff_t *offset)
1209{
1210        long result, timeout;
1211        int count1;
1212        struct snd_rawmidi_file *rfile;
1213        struct snd_rawmidi_runtime *runtime;
1214        struct snd_rawmidi_substream *substream;
1215
1216        rfile = file->private_data;
1217        substream = rfile->output;
1218        runtime = substream->runtime;
1219        /* we cannot put an atomic message to our buffer */
1220        if (substream->append && count > runtime->buffer_size)
1221                return -EIO;
1222        result = 0;
1223        while (count > 0) {
1224                spin_lock_irq(&runtime->lock);
1225                while (!snd_rawmidi_ready_append(substream, count)) {
1226                        wait_queue_t wait;
1227                        if (file->f_flags & O_NONBLOCK) {
1228                                spin_unlock_irq(&runtime->lock);
1229                                return result > 0 ? result : -EAGAIN;
1230                        }
1231                        init_waitqueue_entry(&wait, current);
1232                        add_wait_queue(&runtime->sleep, &wait);
1233                        set_current_state(TASK_INTERRUPTIBLE);
1234                        spin_unlock_irq(&runtime->lock);
1235                        timeout = schedule_timeout(30 * HZ);
1236                        remove_wait_queue(&runtime->sleep, &wait);
1237                        if (signal_pending(current))
1238                                return result > 0 ? result : -ERESTARTSYS;
1239                        if (!runtime->avail && !timeout)
1240                                return result > 0 ? result : -EIO;
1241                        spin_lock_irq(&runtime->lock);
1242                }
1243                spin_unlock_irq(&runtime->lock);
1244                count1 = snd_rawmidi_kernel_write1(substream, buf, NULL, count);
1245                if (count1 < 0)
1246                        return result > 0 ? result : count1;
1247                result += count1;
1248                buf += count1;
1249                if ((size_t)count1 < count && (file->f_flags & O_NONBLOCK))
1250                        break;
1251                count -= count1;
1252        }
1253        if (file->f_flags & O_DSYNC) {
1254                spin_lock_irq(&runtime->lock);
1255                while (runtime->avail != runtime->buffer_size) {
1256                        wait_queue_t wait;
1257                        unsigned int last_avail = runtime->avail;
1258                        init_waitqueue_entry(&wait, current);
1259                        add_wait_queue(&runtime->sleep, &wait);
1260                        set_current_state(TASK_INTERRUPTIBLE);
1261                        spin_unlock_irq(&runtime->lock);
1262                        timeout = schedule_timeout(30 * HZ);
1263                        remove_wait_queue(&runtime->sleep, &wait);
1264                        if (signal_pending(current))
1265                                return result > 0 ? result : -ERESTARTSYS;
1266                        if (runtime->avail == last_avail && !timeout)
1267                                return result > 0 ? result : -EIO;
1268                        spin_lock_irq(&runtime->lock);
1269                }
1270                spin_unlock_irq(&runtime->lock);
1271        }
1272        return result;
1273}
1274
1275static unsigned int snd_rawmidi_poll(struct file *file, poll_table * wait)
1276{
1277        struct snd_rawmidi_file *rfile;
1278        struct snd_rawmidi_runtime *runtime;
1279        unsigned int mask;
1280
1281        rfile = file->private_data;
1282        if (rfile->input != NULL) {
1283                runtime = rfile->input->runtime;
1284                snd_rawmidi_input_trigger(rfile->input, 1);
1285                poll_wait(file, &runtime->sleep, wait);
1286        }
1287        if (rfile->output != NULL) {
1288                runtime = rfile->output->runtime;
1289                poll_wait(file, &runtime->sleep, wait);
1290        }
1291        mask = 0;
1292        if (rfile->input != NULL) {
1293                if (snd_rawmidi_ready(rfile->input))
1294                        mask |= POLLIN | POLLRDNORM;
1295        }
1296        if (rfile->output != NULL) {
1297                if (snd_rawmidi_ready(rfile->output))
1298                        mask |= POLLOUT | POLLWRNORM;
1299        }
1300        return mask;
1301}
1302
1303/*
1304 */
1305#ifdef CONFIG_COMPAT
1306#include "rawmidi_compat.c"
1307#else
1308#define snd_rawmidi_ioctl_compat        NULL
1309#endif
1310
1311/*
1312
1313 */
1314
1315static void snd_rawmidi_proc_info_read(struct snd_info_entry *entry,
1316                                       struct snd_info_buffer *buffer)
1317{
1318        struct snd_rawmidi *rmidi;
1319        struct snd_rawmidi_substream *substream;
1320        struct snd_rawmidi_runtime *runtime;
1321
1322        rmidi = entry->private_data;
1323        snd_iprintf(buffer, "%s\n\n", rmidi->name);
1324        mutex_lock(&rmidi->open_mutex);
1325        if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_OUTPUT) {
1326                list_for_each_entry(substream,
1327                                    &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams,
1328                                    list) {
1329                        snd_iprintf(buffer,
1330                                    "Output %d\n"
1331                                    "  Tx bytes     : %lu\n",
1332                                    substream->number,
1333                                    (unsigned long) substream->bytes);
1334                        if (substream->opened) {
1335                                snd_iprintf(buffer,
1336                                    "  Owner PID    : %d\n",
1337                                    pid_vnr(substream->pid));
1338                                runtime = substream->runtime;
1339                                snd_iprintf(buffer,
1340                                    "  Mode         : %s\n"
1341                                    "  Buffer size  : %lu\n"
1342                                    "  Avail        : %lu\n",
1343                                    runtime->oss ? "OSS compatible" : "native",
1344                                    (unsigned long) runtime->buffer_size,
1345                                    (unsigned long) runtime->avail);
1346                        }
1347                }
1348        }
1349        if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_INPUT) {
1350                list_for_each_entry(substream,
1351                                    &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams,
1352                                    list) {
1353                        snd_iprintf(buffer,
1354                                    "Input %d\n"
1355                                    "  Rx bytes     : %lu\n",
1356                                    substream->number,
1357                                    (unsigned long) substream->bytes);
1358                        if (substream->opened) {
1359                                snd_iprintf(buffer,
1360                                            "  Owner PID    : %d\n",
1361                                            pid_vnr(substream->pid));
1362                                runtime = substream->runtime;
1363                                snd_iprintf(buffer,
1364                                            "  Buffer size  : %lu\n"
1365                                            "  Avail        : %lu\n"
1366                                            "  Overruns     : %lu\n",
1367                                            (unsigned long) runtime->buffer_size,
1368                                            (unsigned long) runtime->avail,
1369                                            (unsigned long) runtime->xruns);
1370                        }
1371                }
1372        }
1373        mutex_unlock(&rmidi->open_mutex);
1374}
1375
1376/*
1377 *  Register functions
1378 */
1379
1380static const struct file_operations snd_rawmidi_f_ops =
1381{
1382        .owner =        THIS_MODULE,
1383        .read =         snd_rawmidi_read,
1384        .write =        snd_rawmidi_write,
1385        .open =         snd_rawmidi_open,
1386        .release =      snd_rawmidi_release,
1387        .llseek =       no_llseek,
1388        .poll =         snd_rawmidi_poll,
1389        .unlocked_ioctl =       snd_rawmidi_ioctl,
1390        .compat_ioctl = snd_rawmidi_ioctl_compat,
1391};
1392
1393static int snd_rawmidi_alloc_substreams(struct snd_rawmidi *rmidi,
1394                                        struct snd_rawmidi_str *stream,
1395                                        int direction,
1396                                        int count)
1397{
1398        struct snd_rawmidi_substream *substream;
1399        int idx;
1400
1401        for (idx = 0; idx < count; idx++) {
1402                substream = kzalloc(sizeof(*substream), GFP_KERNEL);
1403                if (substream == NULL) {
1404                        snd_printk(KERN_ERR "rawmidi: cannot allocate substream\n");
1405                        return -ENOMEM;
1406                }
1407                substream->stream = direction;
1408                substream->number = idx;
1409                substream->rmidi = rmidi;
1410                substream->pstr = stream;
1411                list_add_tail(&substream->list, &stream->substreams);
1412                stream->substream_count++;
1413        }
1414        return 0;
1415}
1416
1417/**
1418 * snd_rawmidi_new - create a rawmidi instance
1419 * @card: the card instance
1420 * @id: the id string
1421 * @device: the device index
1422 * @output_count: the number of output streams
1423 * @input_count: the number of input streams
1424 * @rrawmidi: the pointer to store the new rawmidi instance
1425 *
1426 * Creates a new rawmidi instance.
1427 * Use snd_rawmidi_set_ops() to set the operators to the new instance.
1428 *
1429 * Returns zero if successful, or a negative error code on failure.
1430 */
1431int snd_rawmidi_new(struct snd_card *card, char *id, int device,
1432                    int output_count, int input_count,
1433                    struct snd_rawmidi ** rrawmidi)
1434{
1435        struct snd_rawmidi *rmidi;
1436        int err;
1437        static struct snd_device_ops ops = {
1438                .dev_free = snd_rawmidi_dev_free,
1439                .dev_register = snd_rawmidi_dev_register,
1440                .dev_disconnect = snd_rawmidi_dev_disconnect,
1441        };
1442
1443        if (snd_BUG_ON(!card))
1444                return -ENXIO;
1445        if (rrawmidi)
1446                *rrawmidi = NULL;
1447        rmidi = kzalloc(sizeof(*rmidi), GFP_KERNEL);
1448        if (rmidi == NULL) {
1449                snd_printk(KERN_ERR "rawmidi: cannot allocate\n");
1450                return -ENOMEM;
1451        }
1452        rmidi->card = card;
1453        rmidi->device = device;
1454        mutex_init(&rmidi->open_mutex);
1455        init_waitqueue_head(&rmidi->open_wait);
1456        INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams);
1457        INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams);
1458
1459        if (id != NULL)
1460                strlcpy(rmidi->id, id, sizeof(rmidi->id));
1461        if ((err = snd_rawmidi_alloc_substreams(rmidi,
1462                                                &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT],
1463                                                SNDRV_RAWMIDI_STREAM_INPUT,
1464                                                input_count)) < 0) {
1465                snd_rawmidi_free(rmidi);
1466                return err;
1467        }
1468        if ((err = snd_rawmidi_alloc_substreams(rmidi,
1469                                                &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT],
1470                                                SNDRV_RAWMIDI_STREAM_OUTPUT,
1471                                                output_count)) < 0) {
1472                snd_rawmidi_free(rmidi);
1473                return err;
1474        }
1475        if ((err = snd_device_new(card, SNDRV_DEV_RAWMIDI, rmidi, &ops)) < 0) {
1476                snd_rawmidi_free(rmidi);
1477                return err;
1478        }
1479        if (rrawmidi)
1480                *rrawmidi = rmidi;
1481        return 0;
1482}
1483
1484static void snd_rawmidi_free_substreams(struct snd_rawmidi_str *stream)
1485{
1486        struct snd_rawmidi_substream *substream;
1487
1488        while (!list_empty(&stream->substreams)) {
1489                substream = list_entry(stream->substreams.next, struct snd_rawmidi_substream, list);
1490                list_del(&substream->list);
1491                kfree(substream);
1492        }
1493}
1494
1495static int snd_rawmidi_free(struct snd_rawmidi *rmidi)
1496{
1497        if (!rmidi)
1498                return 0;
1499
1500        snd_info_free_entry(rmidi->proc_entry);
1501        rmidi->proc_entry = NULL;
1502        mutex_lock(&register_mutex);
1503        if (rmidi->ops && rmidi->ops->dev_unregister)
1504                rmidi->ops->dev_unregister(rmidi);
1505        mutex_unlock(&register_mutex);
1506
1507        snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT]);
1508        snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT]);
1509        if (rmidi->private_free)
1510                rmidi->private_free(rmidi);
1511        kfree(rmidi);
1512        return 0;
1513}
1514
1515static int snd_rawmidi_dev_free(struct snd_device *device)
1516{
1517        struct snd_rawmidi *rmidi = device->device_data;
1518        return snd_rawmidi_free(rmidi);
1519}
1520
1521#if defined(CONFIG_SND_SEQUENCER) || (defined(MODULE) && defined(CONFIG_SND_SEQUENCER_MODULE))
1522static void snd_rawmidi_dev_seq_free(struct snd_seq_device *device)
1523{
1524        struct snd_rawmidi *rmidi = device->private_data;
1525        rmidi->seq_dev = NULL;
1526}
1527#endif
1528
1529static int snd_rawmidi_dev_register(struct snd_device *device)
1530{
1531        int err;
1532        struct snd_info_entry *entry;
1533        char name[16];
1534        struct snd_rawmidi *rmidi = device->device_data;
1535
1536        if (rmidi->device >= SNDRV_RAWMIDI_DEVICES)
1537                return -ENOMEM;
1538        mutex_lock(&register_mutex);
1539        if (snd_rawmidi_search(rmidi->card, rmidi->device)) {
1540                mutex_unlock(&register_mutex);
1541                return -EBUSY;
1542        }
1543        list_add_tail(&rmidi->list, &snd_rawmidi_devices);
1544        sprintf(name, "midiC%iD%i", rmidi->card->number, rmidi->device);
1545        if ((err = snd_register_device(SNDRV_DEVICE_TYPE_RAWMIDI,
1546                                       rmidi->card, rmidi->device,
1547                                       &snd_rawmidi_f_ops, rmidi, name)) < 0) {
1548                snd_printk(KERN_ERR "unable to register rawmidi device %i:%i\n", rmidi->card->number, rmidi->device);
1549                list_del(&rmidi->list);
1550                mutex_unlock(&register_mutex);
1551                return err;
1552        }
1553        if (rmidi->ops && rmidi->ops->dev_register &&
1554            (err = rmidi->ops->dev_register(rmidi)) < 0) {
1555                snd_unregister_device(SNDRV_DEVICE_TYPE_RAWMIDI, rmidi->card, rmidi->device);
1556                list_del(&rmidi->list);
1557                mutex_unlock(&register_mutex);
1558                return err;
1559        }
1560#ifdef CONFIG_SND_OSSEMUL
1561        rmidi->ossreg = 0;
1562        if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1563                if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1564                                            rmidi->card, 0, &snd_rawmidi_f_ops,
1565                                            rmidi, name) < 0) {
1566                        snd_printk(KERN_ERR "unable to register OSS rawmidi device %i:%i\n", rmidi->card->number, 0);
1567                } else {
1568                        rmidi->ossreg++;
1569#ifdef SNDRV_OSS_INFO_DEV_MIDI
1570                        snd_oss_info_register(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number, rmidi->name);
1571#endif
1572                }
1573        }
1574        if ((int)rmidi->device == amidi_map[rmidi->card->number]) {
1575                if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1576                                            rmidi->card, 1, &snd_rawmidi_f_ops,
1577                                            rmidi, name) < 0) {
1578                        snd_printk(KERN_ERR "unable to register OSS rawmidi device %i:%i\n", rmidi->card->number, 1);
1579                } else {
1580                        rmidi->ossreg++;
1581                }
1582        }
1583#endif /* CONFIG_SND_OSSEMUL */
1584        mutex_unlock(&register_mutex);
1585        sprintf(name, "midi%d", rmidi->device);
1586        entry = snd_info_create_card_entry(rmidi->card, name, rmidi->card->proc_root);
1587        if (entry) {
1588                entry->private_data = rmidi;
1589                entry->c.text.read = snd_rawmidi_proc_info_read;
1590                if (snd_info_register(entry) < 0) {
1591                        snd_info_free_entry(entry);
1592                        entry = NULL;
1593                }
1594        }
1595        rmidi->proc_entry = entry;
1596#if defined(CONFIG_SND_SEQUENCER) || (defined(MODULE) && defined(CONFIG_SND_SEQUENCER_MODULE))
1597        if (!rmidi->ops || !rmidi->ops->dev_register) { /* own registration mechanism */
1598                if (snd_seq_device_new(rmidi->card, rmidi->device, SNDRV_SEQ_DEV_ID_MIDISYNTH, 0, &rmidi->seq_dev) >= 0) {
1599                        rmidi->seq_dev->private_data = rmidi;
1600                        rmidi->seq_dev->private_free = snd_rawmidi_dev_seq_free;
1601                        sprintf(rmidi->seq_dev->name, "MIDI %d-%d", rmidi->card->number, rmidi->device);
1602                        snd_device_register(rmidi->card, rmidi->seq_dev);
1603                }
1604        }
1605#endif
1606        return 0;
1607}
1608
1609static int snd_rawmidi_dev_disconnect(struct snd_device *device)
1610{
1611        struct snd_rawmidi *rmidi = device->device_data;
1612
1613        mutex_lock(&register_mutex);
1614        list_del_init(&rmidi->list);
1615#ifdef CONFIG_SND_OSSEMUL
1616        if (rmidi->ossreg) {
1617                if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1618                        snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 0);
1619#ifdef SNDRV_OSS_INFO_DEV_MIDI
1620                        snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number);
1621#endif
1622                }
1623                if ((int)rmidi->device == amidi_map[rmidi->card->number])
1624                        snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 1);
1625                rmidi->ossreg = 0;
1626        }
1627#endif /* CONFIG_SND_OSSEMUL */
1628        snd_unregister_device(SNDRV_DEVICE_TYPE_RAWMIDI, rmidi->card, rmidi->device);
1629        mutex_unlock(&register_mutex);
1630        return 0;
1631}
1632
1633/**
1634 * snd_rawmidi_set_ops - set the rawmidi operators
1635 * @rmidi: the rawmidi instance
1636 * @stream: the stream direction, SNDRV_RAWMIDI_STREAM_XXX
1637 * @ops: the operator table
1638 *
1639 * Sets the rawmidi operators for the given stream direction.
1640 */
1641void snd_rawmidi_set_ops(struct snd_rawmidi *rmidi, int stream,
1642                         struct snd_rawmidi_ops *ops)
1643{
1644        struct snd_rawmidi_substream *substream;
1645        
1646        list_for_each_entry(substream, &rmidi->streams[stream].substreams, list)
1647                substream->ops = ops;
1648}
1649
1650/*
1651 *  ENTRY functions
1652 */
1653
1654static int __init alsa_rawmidi_init(void)
1655{
1656
1657        snd_ctl_register_ioctl(snd_rawmidi_control_ioctl);
1658        snd_ctl_register_ioctl_compat(snd_rawmidi_control_ioctl);
1659#ifdef CONFIG_SND_OSSEMUL
1660        { int i;
1661        /* check device map table */
1662        for (i = 0; i < SNDRV_CARDS; i++) {
1663                if (midi_map[i] < 0 || midi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1664                        snd_printk(KERN_ERR "invalid midi_map[%d] = %d\n", i, midi_map[i]);
1665                        midi_map[i] = 0;
1666                }
1667                if (amidi_map[i] < 0 || amidi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1668                        snd_printk(KERN_ERR "invalid amidi_map[%d] = %d\n", i, amidi_map[i]);
1669                        amidi_map[i] = 1;
1670                }
1671        }
1672        }
1673#endif /* CONFIG_SND_OSSEMUL */
1674        return 0;
1675}
1676
1677static void __exit alsa_rawmidi_exit(void)
1678{
1679        snd_ctl_unregister_ioctl(snd_rawmidi_control_ioctl);
1680        snd_ctl_unregister_ioctl_compat(snd_rawmidi_control_ioctl);
1681}
1682
1683module_init(alsa_rawmidi_init)
1684module_exit(alsa_rawmidi_exit)
1685
1686EXPORT_SYMBOL(snd_rawmidi_output_params);
1687EXPORT_SYMBOL(snd_rawmidi_input_params);
1688EXPORT_SYMBOL(snd_rawmidi_drop_output);
1689EXPORT_SYMBOL(snd_rawmidi_drain_output);
1690EXPORT_SYMBOL(snd_rawmidi_drain_input);
1691EXPORT_SYMBOL(snd_rawmidi_receive);
1692EXPORT_SYMBOL(snd_rawmidi_transmit_empty);
1693EXPORT_SYMBOL(snd_rawmidi_transmit_peek);
1694EXPORT_SYMBOL(snd_rawmidi_transmit_ack);
1695EXPORT_SYMBOL(snd_rawmidi_transmit);
1696EXPORT_SYMBOL(snd_rawmidi_new);
1697EXPORT_SYMBOL(snd_rawmidi_set_ops);
1698EXPORT_SYMBOL(snd_rawmidi_info_select);
1699EXPORT_SYMBOL(snd_rawmidi_kernel_open);
1700EXPORT_SYMBOL(snd_rawmidi_kernel_release);
1701EXPORT_SYMBOL(snd_rawmidi_kernel_read);
1702EXPORT_SYMBOL(snd_rawmidi_kernel_write);
1703
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