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                snd_card_unref(rmidi->card);
 384                return -ENXIO;
 385        }
 386
 387        mutex_lock(&rmidi->open_mutex);
 388        card = rmidi->card;
 389        err = snd_card_file_add(card, file);
 390        if (err < 0)
 391                goto __error_card;
 392        fflags = snd_rawmidi_file_flags(file);
 393        if ((file->f_flags & O_APPEND) || maj == SOUND_MAJOR) /* OSS emul? */
 394                fflags |= SNDRV_RAWMIDI_LFLG_APPEND;
 395        rawmidi_file = kmalloc(sizeof(*rawmidi_file), GFP_KERNEL);
 396        if (rawmidi_file == NULL) {
 397                err = -ENOMEM;
 398                goto __error;
 399        }
 400        init_waitqueue_entry(&wait, current);
 401        add_wait_queue(&rmidi->open_wait, &wait);
 402        while (1) {
 403                subdevice = -1;
 404                read_lock(&card->ctl_files_rwlock);
 405                list_for_each_entry(kctl, &card->ctl_files, list) {
 406                        if (kctl->pid == task_pid(current)) {
 407                                subdevice = kctl->prefer_rawmidi_subdevice;
 408                                if (subdevice != -1)
 409                                        break;
 410                        }
 411                }
 412                read_unlock(&card->ctl_files_rwlock);
 413                err = rawmidi_open_priv(rmidi, subdevice, fflags, rawmidi_file);
 414                if (err >= 0)
 415                        break;
 416                if (err == -EAGAIN) {
 417                        if (file->f_flags & O_NONBLOCK) {
 418                                err = -EBUSY;
 419                                break;
 420                        }
 421                } else
 422                        break;
 423                set_current_state(TASK_INTERRUPTIBLE);
 424                mutex_unlock(&rmidi->open_mutex);
 425                schedule();
 426                mutex_lock(&rmidi->open_mutex);
 427                if (rmidi->card->shutdown) {
 428                        err = -ENODEV;
 429                        break;
 430                }
 431                if (signal_pending(current)) {
 432                        err = -ERESTARTSYS;
 433                        break;
 434                }
 435        }
 436        remove_wait_queue(&rmidi->open_wait, &wait);
 437        if (err < 0) {
 438                kfree(rawmidi_file);
 439                goto __error;
 440        }
 441#ifdef CONFIG_SND_OSSEMUL
 442        if (rawmidi_file->input && rawmidi_file->input->runtime)
 443                rawmidi_file->input->runtime->oss = (maj == SOUND_MAJOR);
 444        if (rawmidi_file->output && rawmidi_file->output->runtime)
 445                rawmidi_file->output->runtime->oss = (maj == SOUND_MAJOR);
 446#endif
 447        file->private_data = rawmidi_file;
 448        mutex_unlock(&rmidi->open_mutex);
 449        snd_card_unref(rmidi->card);
 450        return 0;
 451
 452 __error:
 453        snd_card_file_remove(card, file);
 454 __error_card:
 455        mutex_unlock(&rmidi->open_mutex);
 456        module_put(rmidi->card->module);
 457        snd_card_unref(rmidi->card);
 458        return err;
 459}
 460
 461static void close_substream(struct snd_rawmidi *rmidi,
 462                            struct snd_rawmidi_substream *substream,
 463                            int cleanup)
 464{
 465        if (--substream->use_count)
 466                return;
 467
 468        if (cleanup) {
 469                if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
 470                        snd_rawmidi_input_trigger(substream, 0);
 471                else {
 472                        if (substream->active_sensing) {
 473                                unsigned char buf = 0xfe;
 474                                /* sending single active sensing message
 475                                 * to shut the device up
 476                                 */
 477                                snd_rawmidi_kernel_write(substream, &buf, 1);
 478                        }
 479                        if (snd_rawmidi_drain_output(substream) == -ERESTARTSYS)
 480                                snd_rawmidi_output_trigger(substream, 0);
 481                }
 482        }
 483        substream->ops->close(substream);
 484        if (substream->runtime->private_free)
 485                substream->runtime->private_free(substream);
 486        snd_rawmidi_runtime_free(substream);
 487        substream->opened = 0;
 488        substream->append = 0;
 489        put_pid(substream->pid);
 490        substream->pid = NULL;
 491        rmidi->streams[substream->stream].substream_opened--;
 492}
 493
 494static void rawmidi_release_priv(struct snd_rawmidi_file *rfile)
 495{
 496        struct snd_rawmidi *rmidi;
 497
 498        rmidi = rfile->rmidi;
 499        mutex_lock(&rmidi->open_mutex);
 500        if (rfile->input) {
 501                close_substream(rmidi, rfile->input, 1);
 502                rfile->input = NULL;
 503        }
 504        if (rfile->output) {
 505                close_substream(rmidi, rfile->output, 1);
 506                rfile->output = NULL;
 507        }
 508        rfile->rmidi = NULL;
 509        mutex_unlock(&rmidi->open_mutex);
 510        wake_up(&rmidi->open_wait);
 511}
 512
 513/* called from sound/core/seq/seq_midi.c */
 514int snd_rawmidi_kernel_release(struct snd_rawmidi_file *rfile)
 515{
 516        struct snd_rawmidi *rmidi;
 517
 518        if (snd_BUG_ON(!rfile))
 519                return -ENXIO;
 520        
 521        rmidi = rfile->rmidi;
 522        rawmidi_release_priv(rfile);
 523        module_put(rmidi->card->module);
 524        return 0;
 525}
 526
 527static int snd_rawmidi_release(struct inode *inode, struct file *file)
 528{
 529        struct snd_rawmidi_file *rfile;
 530        struct snd_rawmidi *rmidi;
 531        struct module *module;
 532
 533        rfile = file->private_data;
 534        rmidi = rfile->rmidi;
 535        rawmidi_release_priv(rfile);
 536        kfree(rfile);
 537        module = rmidi->card->module;
 538        snd_card_file_remove(rmidi->card, file);
 539        module_put(module);
 540        return 0;
 541}
 542
 543static int snd_rawmidi_info(struct snd_rawmidi_substream *substream,
 544                            struct snd_rawmidi_info *info)
 545{
 546        struct snd_rawmidi *rmidi;
 547        
 548        if (substream == NULL)
 549                return -ENODEV;
 550        rmidi = substream->rmidi;
 551        memset(info, 0, sizeof(*info));
 552        info->card = rmidi->card->number;
 553        info->device = rmidi->device;
 554        info->subdevice = substream->number;
 555        info->stream = substream->stream;
 556        info->flags = rmidi->info_flags;
 557        strcpy(info->id, rmidi->id);
 558        strcpy(info->name, rmidi->name);
 559        strcpy(info->subname, substream->name);
 560        info->subdevices_count = substream->pstr->substream_count;
 561        info->subdevices_avail = (substream->pstr->substream_count -
 562                                  substream->pstr->substream_opened);
 563        return 0;
 564}
 565
 566static int snd_rawmidi_info_user(struct snd_rawmidi_substream *substream,
 567                                 struct snd_rawmidi_info __user * _info)
 568{
 569        struct snd_rawmidi_info info;
 570        int err;
 571        if ((err = snd_rawmidi_info(substream, &info)) < 0)
 572                return err;
 573        if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
 574                return -EFAULT;
 575        return 0;
 576}
 577
 578int snd_rawmidi_info_select(struct snd_card *card, struct snd_rawmidi_info *info)
 579{
 580        struct snd_rawmidi *rmidi;
 581        struct snd_rawmidi_str *pstr;
 582        struct snd_rawmidi_substream *substream;
 583
 584        mutex_lock(&register_mutex);
 585        rmidi = snd_rawmidi_search(card, info->device);
 586        mutex_unlock(&register_mutex);
 587        if (!rmidi)
 588                return -ENXIO;
 589        if (info->stream < 0 || info->stream > 1)
 590                return -EINVAL;
 591        pstr = &rmidi->streams[info->stream];
 592        if (pstr->substream_count == 0)
 593                return -ENOENT;
 594        if (info->subdevice >= pstr->substream_count)
 595                return -ENXIO;
 596        list_for_each_entry(substream, &pstr->substreams, list) {
 597                if ((unsigned int)substream->number == info->subdevice)
 598                        return snd_rawmidi_info(substream, info);
 599        }
 600        return -ENXIO;
 601}
 602
 603static int snd_rawmidi_info_select_user(struct snd_card *card,
 604                                        struct snd_rawmidi_info __user *_info)
 605{
 606        int err;
 607        struct snd_rawmidi_info info;
 608        if (get_user(info.device, &_info->device))
 609                return -EFAULT;
 610        if (get_user(info.stream, &_info->stream))
 611                return -EFAULT;
 612        if (get_user(info.subdevice, &_info->subdevice))
 613                return -EFAULT;
 614        if ((err = snd_rawmidi_info_select(card, &info)) < 0)
 615                return err;
 616        if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
 617                return -EFAULT;
 618        return 0;
 619}
 620
 621int snd_rawmidi_output_params(struct snd_rawmidi_substream *substream,
 622                              struct snd_rawmidi_params * params)
 623{
 624        char *newbuf;
 625        struct snd_rawmidi_runtime *runtime = substream->runtime;
 626        
 627        if (substream->append && substream->use_count > 1)
 628                return -EBUSY;
 629        snd_rawmidi_drain_output(substream);
 630        if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L) {
 631                return -EINVAL;
 632        }
 633        if (params->avail_min < 1 || params->avail_min > params->buffer_size) {
 634                return -EINVAL;
 635        }
 636        if (params->buffer_size != runtime->buffer_size) {
 637                newbuf = krealloc(runtime->buffer, params->buffer_size,
 638                                  GFP_KERNEL);
 639                if (!newbuf)
 640                        return -ENOMEM;
 641                runtime->buffer = newbuf;
 642                runtime->buffer_size = params->buffer_size;
 643                runtime->avail = runtime->buffer_size;
 644        }
 645        runtime->avail_min = params->avail_min;
 646        substream->active_sensing = !params->no_active_sensing;
 647        return 0;
 648}
 649
 650int snd_rawmidi_input_params(struct snd_rawmidi_substream *substream,
 651                             struct snd_rawmidi_params * params)
 652{
 653        char *newbuf;
 654        struct snd_rawmidi_runtime *runtime = substream->runtime;
 655
 656        snd_rawmidi_drain_input(substream);
 657        if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L) {
 658                return -EINVAL;
 659        }
 660        if (params->avail_min < 1 || params->avail_min > params->buffer_size) {
 661                return -EINVAL;
 662        }
 663        if (params->buffer_size != runtime->buffer_size) {
 664                newbuf = krealloc(runtime->buffer, params->buffer_size,
 665                                  GFP_KERNEL);
 666                if (!newbuf)
 667                        return -ENOMEM;
 668                runtime->buffer = newbuf;
 669                runtime->buffer_size = params->buffer_size;
 670        }
 671        runtime->avail_min = params->avail_min;
 672        return 0;
 673}
 674
 675static int snd_rawmidi_output_status(struct snd_rawmidi_substream *substream,
 676                                     struct snd_rawmidi_status * status)
 677{
 678        struct snd_rawmidi_runtime *runtime = substream->runtime;
 679
 680        memset(status, 0, sizeof(*status));
 681        status->stream = SNDRV_RAWMIDI_STREAM_OUTPUT;
 682        spin_lock_irq(&runtime->lock);
 683        status->avail = runtime->avail;
 684        spin_unlock_irq(&runtime->lock);
 685        return 0;
 686}
 687
 688static int snd_rawmidi_input_status(struct snd_rawmidi_substream *substream,
 689                                    struct snd_rawmidi_status * status)
 690{
 691        struct snd_rawmidi_runtime *runtime = substream->runtime;
 692
 693        memset(status, 0, sizeof(*status));
 694        status->stream = SNDRV_RAWMIDI_STREAM_INPUT;
 695        spin_lock_irq(&runtime->lock);
 696        status->avail = runtime->avail;
 697        status->xruns = runtime->xruns;
 698        runtime->xruns = 0;
 699        spin_unlock_irq(&runtime->lock);
 700        return 0;
 701}
 702
 703static long snd_rawmidi_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 704{
 705        struct snd_rawmidi_file *rfile;
 706        void __user *argp = (void __user *)arg;
 707
 708        rfile = file->private_data;
 709        if (((cmd >> 8) & 0xff) != 'W')
 710                return -ENOTTY;
 711        switch (cmd) {
 712        case SNDRV_RAWMIDI_IOCTL_PVERSION:
 713                return put_user(SNDRV_RAWMIDI_VERSION, (int __user *)argp) ? -EFAULT : 0;
 714        case SNDRV_RAWMIDI_IOCTL_INFO:
 715        {
 716                int stream;
 717                struct snd_rawmidi_info __user *info = argp;
 718                if (get_user(stream, &info->stream))
 719                        return -EFAULT;
 720                switch (stream) {
 721                case SNDRV_RAWMIDI_STREAM_INPUT:
 722                        return snd_rawmidi_info_user(rfile->input, info);
 723                case SNDRV_RAWMIDI_STREAM_OUTPUT:
 724                        return snd_rawmidi_info_user(rfile->output, info);
 725                default:
 726                        return -EINVAL;
 727                }
 728        }
 729        case SNDRV_RAWMIDI_IOCTL_PARAMS:
 730        {
 731                struct snd_rawmidi_params params;
 732                if (copy_from_user(&params, argp, sizeof(struct snd_rawmidi_params)))
 733                        return -EFAULT;
 734                switch (params.stream) {
 735                case SNDRV_RAWMIDI_STREAM_OUTPUT:
 736                        if (rfile->output == NULL)
 737                                return -EINVAL;
 738                        return snd_rawmidi_output_params(rfile->output, &params);
 739                case SNDRV_RAWMIDI_STREAM_INPUT:
 740                        if (rfile->input == NULL)
 741                                return -EINVAL;
 742                        return snd_rawmidi_input_params(rfile->input, &params);
 743                default:
 744                        return -EINVAL;
 745                }
 746        }
 747        case SNDRV_RAWMIDI_IOCTL_STATUS:
 748        {
 749                int err = 0;
 750                struct snd_rawmidi_status status;
 751                if (copy_from_user(&status, argp, sizeof(struct snd_rawmidi_status)))
 752                        return -EFAULT;
 753                switch (status.stream) {
 754                case SNDRV_RAWMIDI_STREAM_OUTPUT:
 755                        if (rfile->output == NULL)
 756                                return -EINVAL;
 757                        err = snd_rawmidi_output_status(rfile->output, &status);
 758                        break;
 759                case SNDRV_RAWMIDI_STREAM_INPUT:
 760                        if (rfile->input == NULL)
 761                                return -EINVAL;
 762                        err = snd_rawmidi_input_status(rfile->input, &status);
 763                        break;
 764                default:
 765                        return -EINVAL;
 766                }
 767                if (err < 0)
 768                        return err;
 769                if (copy_to_user(argp, &status, sizeof(struct snd_rawmidi_status)))
 770                        return -EFAULT;
 771                return 0;
 772        }
 773        case SNDRV_RAWMIDI_IOCTL_DROP:
 774        {
 775                int val;
 776                if (get_user(val, (int __user *) argp))
 777                        return -EFAULT;
 778                switch (val) {
 779                case SNDRV_RAWMIDI_STREAM_OUTPUT:
 780                        if (rfile->output == NULL)
 781                                return -EINVAL;
 782                        return snd_rawmidi_drop_output(rfile->output);
 783                default:
 784                        return -EINVAL;
 785                }
 786        }
 787        case SNDRV_RAWMIDI_IOCTL_DRAIN:
 788        {
 789                int val;
 790                if (get_user(val, (int __user *) argp))
 791                        return -EFAULT;
 792                switch (val) {
 793                case SNDRV_RAWMIDI_STREAM_OUTPUT:
 794                        if (rfile->output == NULL)
 795                                return -EINVAL;
 796                        return snd_rawmidi_drain_output(rfile->output);
 797                case SNDRV_RAWMIDI_STREAM_INPUT:
 798                        if (rfile->input == NULL)
 799                                return -EINVAL;
 800                        return snd_rawmidi_drain_input(rfile->input);
 801                default:
 802                        return -EINVAL;
 803                }
 804        }
 805#ifdef CONFIG_SND_DEBUG
 806        default:
 807                snd_printk(KERN_WARNING "rawmidi: unknown command = 0x%x\n", cmd);
 808#endif
 809        }
 810        return -ENOTTY;
 811}
 812
 813static int snd_rawmidi_control_ioctl(struct snd_card *card,
 814                                     struct snd_ctl_file *control,
 815                                     unsigned int cmd,
 816                                     unsigned long arg)
 817{
 818        void __user *argp = (void __user *)arg;
 819
 820        switch (cmd) {
 821        case SNDRV_CTL_IOCTL_RAWMIDI_NEXT_DEVICE:
 822        {
 823                int device;
 824                
 825                if (get_user(device, (int __user *)argp))
 826                        return -EFAULT;
 827                if (device >= SNDRV_RAWMIDI_DEVICES) /* next device is -1 */
 828                        device = SNDRV_RAWMIDI_DEVICES - 1;
 829                mutex_lock(&register_mutex);
 830                device = device < 0 ? 0 : device + 1;
 831                while (device < SNDRV_RAWMIDI_DEVICES) {
 832                        if (snd_rawmidi_search(card, device))
 833                                break;
 834                        device++;
 835                }
 836                if (device == SNDRV_RAWMIDI_DEVICES)
 837                        device = -1;
 838                mutex_unlock(&register_mutex);
 839                if (put_user(device, (int __user *)argp))
 840                        return -EFAULT;
 841                return 0;
 842        }
 843        case SNDRV_CTL_IOCTL_RAWMIDI_PREFER_SUBDEVICE:
 844        {
 845                int val;
 846                
 847                if (get_user(val, (int __user *)argp))
 848                        return -EFAULT;
 849                control->prefer_rawmidi_subdevice = val;
 850                return 0;
 851        }
 852        case SNDRV_CTL_IOCTL_RAWMIDI_INFO:
 853                return snd_rawmidi_info_select_user(card, argp);
 854        }
 855        return -ENOIOCTLCMD;
 856}
 857
 858/**
 859 * snd_rawmidi_receive - receive the input data from the device
 860 * @substream: the rawmidi substream
 861 * @buffer: the buffer pointer
 862 * @count: the data size to read
 863 *
 864 * Reads the data from the internal buffer.
 865 *
 866 * Returns the size of read data, or a negative error code on failure.
 867 */
 868int snd_rawmidi_receive(struct snd_rawmidi_substream *substream,
 869                        const unsigned char *buffer, int count)
 870{
 871        unsigned long flags;
 872        int result = 0, count1;
 873        struct snd_rawmidi_runtime *runtime = substream->runtime;
 874
 875        if (!substream->opened)
 876                return -EBADFD;
 877        if (runtime->buffer == NULL) {
 878                snd_printd("snd_rawmidi_receive: input is not active!!!\n");
 879                return -EINVAL;
 880        }
 881        spin_lock_irqsave(&runtime->lock, flags);
 882        if (count == 1) {       /* special case, faster code */
 883                substream->bytes++;
 884                if (runtime->avail < runtime->buffer_size) {
 885                        runtime->buffer[runtime->hw_ptr++] = buffer[0];
 886                        runtime->hw_ptr %= runtime->buffer_size;
 887                        runtime->avail++;
 888                        result++;
 889                } else {
 890                        runtime->xruns++;
 891                }
 892        } else {
 893                substream->bytes += count;
 894                count1 = runtime->buffer_size - runtime->hw_ptr;
 895                if (count1 > count)
 896                        count1 = count;
 897                if (count1 > (int)(runtime->buffer_size - runtime->avail))
 898                        count1 = runtime->buffer_size - runtime->avail;
 899                memcpy(runtime->buffer + runtime->hw_ptr, buffer, count1);
 900                runtime->hw_ptr += count1;
 901                runtime->hw_ptr %= runtime->buffer_size;
 902                runtime->avail += count1;
 903                count -= count1;
 904                result += count1;
 905                if (count > 0) {
 906                        buffer += count1;
 907                        count1 = count;
 908                        if (count1 > (int)(runtime->buffer_size - runtime->avail)) {
 909                                count1 = runtime->buffer_size - runtime->avail;
 910                                runtime->xruns += count - count1;
 911                        }
 912                        if (count1 > 0) {
 913                                memcpy(runtime->buffer, buffer, count1);
 914                                runtime->hw_ptr = count1;
 915                                runtime->avail += count1;
 916                                result += count1;
 917                        }
 918                }
 919        }
 920        if (result > 0) {
 921                if (runtime->event)
 922                        schedule_work(&runtime->event_work);
 923                else if (snd_rawmidi_ready(substream))
 924                        wake_up(&runtime->sleep);
 925        }
 926        spin_unlock_irqrestore(&runtime->lock, flags);
 927        return result;
 928}
 929
 930static long snd_rawmidi_kernel_read1(struct snd_rawmidi_substream *substream,
 931                                     unsigned char __user *userbuf,
 932                                     unsigned char *kernelbuf, long count)
 933{
 934        unsigned long flags;
 935        long result = 0, count1;
 936        struct snd_rawmidi_runtime *runtime = substream->runtime;
 937
 938        while (count > 0 && runtime->avail) {
 939                count1 = runtime->buffer_size - runtime->appl_ptr;
 940                if (count1 > count)
 941                        count1 = count;
 942                spin_lock_irqsave(&runtime->lock, flags);
 943                if (count1 > (int)runtime->avail)
 944                        count1 = runtime->avail;
 945                if (kernelbuf)
 946                        memcpy(kernelbuf + result, runtime->buffer + runtime->appl_ptr, count1);
 947                if (userbuf) {
 948                        spin_unlock_irqrestore(&runtime->lock, flags);
 949                        if (copy_to_user(userbuf + result,
 950                                         runtime->buffer + runtime->appl_ptr, count1)) {
 951                                return result > 0 ? result : -EFAULT;
 952                        }
 953                        spin_lock_irqsave(&runtime->lock, flags);
 954                }
 955                runtime->appl_ptr += count1;
 956                runtime->appl_ptr %= runtime->buffer_size;
 957                runtime->avail -= count1;
 958                spin_unlock_irqrestore(&runtime->lock, flags);
 959                result += count1;
 960                count -= count1;
 961        }
 962        return result;
 963}
 964
 965long snd_rawmidi_kernel_read(struct snd_rawmidi_substream *substream,
 966                             unsigned char *buf, long count)
 967{
 968        snd_rawmidi_input_trigger(substream, 1);
 969        return snd_rawmidi_kernel_read1(substream, NULL/*userbuf*/, buf, count);
 970}
 971
 972static ssize_t snd_rawmidi_read(struct file *file, char __user *buf, size_t count,
 973                                loff_t *offset)
 974{
 975        long result;
 976        int count1;
 977        struct snd_rawmidi_file *rfile;
 978        struct snd_rawmidi_substream *substream;
 979        struct snd_rawmidi_runtime *runtime;
 980
 981        rfile = file->private_data;
 982        substream = rfile->input;
 983        if (substream == NULL)
 984                return -EIO;
 985        runtime = substream->runtime;
 986        snd_rawmidi_input_trigger(substream, 1);
 987        result = 0;
 988        while (count > 0) {
 989                spin_lock_irq(&runtime->lock);
 990                while (!snd_rawmidi_ready(substream)) {
 991                        wait_queue_t wait;
 992                        if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
 993                                spin_unlock_irq(&runtime->lock);
 994                                return result > 0 ? result : -EAGAIN;
 995                        }
 996                        init_waitqueue_entry(&wait, current);
 997                        add_wait_queue(&runtime->sleep, &wait);
 998                        set_current_state(TASK_INTERRUPTIBLE);
 999                        spin_unlock_irq(&runtime->lock);
1000                        schedule();
1001                        remove_wait_queue(&runtime->sleep, &wait);
1002                        if (rfile->rmidi->card->shutdown)
1003                                return -ENODEV;
1004                        if (signal_pending(current))
1005                                return result > 0 ? result : -ERESTARTSYS;
1006                        if (!runtime->avail)
1007                                return result > 0 ? result : -EIO;
1008                        spin_lock_irq(&runtime->lock);
1009                }
1010                spin_unlock_irq(&runtime->lock);
1011                count1 = snd_rawmidi_kernel_read1(substream,
1012                                                  (unsigned char __user *)buf,
1013                                                  NULL/*kernelbuf*/,
1014                                                  count);
1015                if (count1 < 0)
1016                        return result > 0 ? result : count1;
1017                result += count1;
1018                buf += count1;
1019                count -= count1;
1020        }
1021        return result;
1022}
1023
1024/**
1025 * snd_rawmidi_transmit_empty - check whether the output buffer is empty
1026 * @substream: the rawmidi substream
1027 * 
1028 * Returns 1 if the internal output buffer is empty, 0 if not.
1029 */
1030int snd_rawmidi_transmit_empty(struct snd_rawmidi_substream *substream)
1031{
1032        struct snd_rawmidi_runtime *runtime = substream->runtime;
1033        int result;
1034        unsigned long flags;
1035
1036        if (runtime->buffer == NULL) {
1037                snd_printd("snd_rawmidi_transmit_empty: output is not active!!!\n");
1038                return 1;
1039        }
1040        spin_lock_irqsave(&runtime->lock, flags);
1041        result = runtime->avail >= runtime->buffer_size;
1042        spin_unlock_irqrestore(&runtime->lock, flags);
1043        return result;          
1044}
1045
1046/**
1047 * snd_rawmidi_transmit_peek - copy data from the internal buffer
1048 * @substream: the rawmidi substream
1049 * @buffer: the buffer pointer
1050 * @count: data size to transfer
1051 *
1052 * Copies data from the internal output buffer to the given buffer.
1053 *
1054 * Call this in the interrupt handler when the midi output is ready,
1055 * and call snd_rawmidi_transmit_ack() after the transmission is
1056 * finished.
1057 *
1058 * Returns the size of copied data, or a negative error code on failure.
1059 */
1060int snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
1061                              unsigned char *buffer, int count)
1062{
1063        unsigned long flags;
1064        int result, count1;
1065        struct snd_rawmidi_runtime *runtime = substream->runtime;
1066
1067        if (runtime->buffer == NULL) {
1068                snd_printd("snd_rawmidi_transmit_peek: output is not active!!!\n");
1069                return -EINVAL;
1070        }
1071        result = 0;
1072        spin_lock_irqsave(&runtime->lock, flags);
1073        if (runtime->avail >= runtime->buffer_size) {
1074                /* warning: lowlevel layer MUST trigger down the hardware */
1075                goto __skip;
1076        }
1077        if (count == 1) {       /* special case, faster code */
1078                *buffer = runtime->buffer[runtime->hw_ptr];
1079                result++;
1080        } else {
1081                count1 = runtime->buffer_size - runtime->hw_ptr;
1082                if (count1 > count)
1083                        count1 = count;
1084                if (count1 > (int)(runtime->buffer_size - runtime->avail))
1085                        count1 = runtime->buffer_size - runtime->avail;
1086                memcpy(buffer, runtime->buffer + runtime->hw_ptr, count1);
1087                count -= count1;
1088                result += count1;
1089                if (count > 0) {
1090                        if (count > (int)(runtime->buffer_size - runtime->avail - count1))
1091                                count = runtime->buffer_size - runtime->avail - count1;
1092                        memcpy(buffer + count1, runtime->buffer, count);
1093                        result += count;
1094                }
1095        }
1096      __skip:
1097        spin_unlock_irqrestore(&runtime->lock, flags);
1098        return result;
1099}
1100
1101/**
1102 * snd_rawmidi_transmit_ack - acknowledge the transmission
1103 * @substream: the rawmidi substream
1104 * @count: the tranferred count
1105 *
1106 * Advances the hardware pointer for the internal output buffer with
1107 * the given size and updates the condition.
1108 * Call after the transmission is finished.
1109 *
1110 * Returns the advanced size if successful, or a negative error code on failure.
1111 */
1112int snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count)
1113{
1114        unsigned long flags;
1115        struct snd_rawmidi_runtime *runtime = substream->runtime;
1116
1117        if (runtime->buffer == NULL) {
1118                snd_printd("snd_rawmidi_transmit_ack: output is not active!!!\n");
1119                return -EINVAL;
1120        }
1121        spin_lock_irqsave(&runtime->lock, flags);
1122        snd_BUG_ON(runtime->avail + count > runtime->buffer_size);
1123        runtime->hw_ptr += count;
1124        runtime->hw_ptr %= runtime->buffer_size;
1125        runtime->avail += count;
1126        substream->bytes += count;
1127        if (count > 0) {
1128                if (runtime->drain || snd_rawmidi_ready(substream))
1129                        wake_up(&runtime->sleep);
1130        }
1131        spin_unlock_irqrestore(&runtime->lock, flags);
1132        return count;
1133}
1134
1135/**
1136 * snd_rawmidi_transmit - copy from the buffer to the device
1137 * @substream: the rawmidi substream
1138 * @buffer: the buffer pointer
1139 * @count: the data size to transfer
1140 * 
1141 * Copies data from the buffer to the device and advances the pointer.
1142 *
1143 * Returns the copied size if successful, or a negative error code on failure.
1144 */
1145int snd_rawmidi_transmit(struct snd_rawmidi_substream *substream,
1146                         unsigned char *buffer, int count)
1147{
1148        if (!substream->opened)
1149                return -EBADFD;
1150        count = snd_rawmidi_transmit_peek(substream, buffer, count);
1151        if (count < 0)
1152                return count;
1153        return snd_rawmidi_transmit_ack(substream, count);
1154}
1155
1156static long snd_rawmidi_kernel_write1(struct snd_rawmidi_substream *substream,
1157                                      const unsigned char __user *userbuf,
1158                                      const unsigned char *kernelbuf,
1159                                      long count)
1160{
1161        unsigned long flags;
1162        long count1, result;
1163        struct snd_rawmidi_runtime *runtime = substream->runtime;
1164
1165        if (snd_BUG_ON(!kernelbuf && !userbuf))
1166                return -EINVAL;
1167        if (snd_BUG_ON(!runtime->buffer))
1168                return -EINVAL;
1169
1170        result = 0;
1171        spin_lock_irqsave(&runtime->lock, flags);
1172        if (substream->append) {
1173                if ((long)runtime->avail < count) {
1174                        spin_unlock_irqrestore(&runtime->lock, flags);
1175                        return -EAGAIN;
1176                }
1177        }
1178        while (count > 0 && runtime->avail > 0) {
1179                count1 = runtime->buffer_size - runtime->appl_ptr;
1180                if (count1 > count)
1181                        count1 = count;
1182                if (count1 > (long)runtime->avail)
1183                        count1 = runtime->avail;
1184                if (kernelbuf)
1185                        memcpy(runtime->buffer + runtime->appl_ptr,
1186                               kernelbuf + result, count1);
1187                else if (userbuf) {
1188                        spin_unlock_irqrestore(&runtime->lock, flags);
1189                        if (copy_from_user(runtime->buffer + runtime->appl_ptr,
1190                                           userbuf + result, count1)) {
1191                                spin_lock_irqsave(&runtime->lock, flags);
1192                                result = result > 0 ? result : -EFAULT;
1193                                goto __end;
1194                        }
1195                        spin_lock_irqsave(&runtime->lock, flags);
1196                }
1197                runtime->appl_ptr += count1;
1198                runtime->appl_ptr %= runtime->buffer_size;
1199                runtime->avail -= count1;
1200                result += count1;
1201                count -= count1;
1202        }
1203      __end:
1204        count1 = runtime->avail < runtime->buffer_size;
1205        spin_unlock_irqrestore(&runtime->lock, flags);
1206        if (count1)
1207                snd_rawmidi_output_trigger(substream, 1);
1208        return result;
1209}
1210
1211long snd_rawmidi_kernel_write(struct snd_rawmidi_substream *substream,
1212                              const unsigned char *buf, long count)
1213{
1214        return snd_rawmidi_kernel_write1(substream, NULL, buf, count);
1215}
1216
1217static ssize_t snd_rawmidi_write(struct file *file, const char __user *buf,
1218                                 size_t count, loff_t *offset)
1219{
1220        long result, timeout;
1221        int count1;
1222        struct snd_rawmidi_file *rfile;
1223        struct snd_rawmidi_runtime *runtime;
1224        struct snd_rawmidi_substream *substream;
1225
1226        rfile = file->private_data;
1227        substream = rfile->output;
1228        runtime = substream->runtime;
1229        /* we cannot put an atomic message to our buffer */
1230        if (substream->append && count > runtime->buffer_size)
1231                return -EIO;
1232        result = 0;
1233        while (count > 0) {
1234                spin_lock_irq(&runtime->lock);
1235                while (!snd_rawmidi_ready_append(substream, count)) {
1236                        wait_queue_t wait;
1237                        if (file->f_flags & O_NONBLOCK) {
1238                                spin_unlock_irq(&runtime->lock);
1239                                return result > 0 ? result : -EAGAIN;
1240                        }
1241                        init_waitqueue_entry(&wait, current);
1242                        add_wait_queue(&runtime->sleep, &wait);
1243                        set_current_state(TASK_INTERRUPTIBLE);
1244                        spin_unlock_irq(&runtime->lock);
1245                        timeout = schedule_timeout(30 * HZ);
1246                        remove_wait_queue(&runtime->sleep, &wait);
1247                        if (rfile->rmidi->card->shutdown)
1248                                return -ENODEV;
1249                        if (signal_pending(current))
1250                                return result > 0 ? result : -ERESTARTSYS;
1251                        if (!runtime->avail && !timeout)
1252                                return result > 0 ? result : -EIO;
1253                        spin_lock_irq(&runtime->lock);
1254                }
1255                spin_unlock_irq(&runtime->lock);
1256                count1 = snd_rawmidi_kernel_write1(substream, buf, NULL, count);
1257                if (count1 < 0)
1258                        return result > 0 ? result : count1;
1259                result += count1;
1260                buf += count1;
1261                if ((size_t)count1 < count && (file->f_flags & O_NONBLOCK))
1262                        break;
1263                count -= count1;
1264        }
1265        if (file->f_flags & O_DSYNC) {
1266                spin_lock_irq(&runtime->lock);
1267                while (runtime->avail != runtime->buffer_size) {
1268                        wait_queue_t wait;
1269                        unsigned int last_avail = runtime->avail;
1270                        init_waitqueue_entry(&wait, current);
1271                        add_wait_queue(&runtime->sleep, &wait);
1272                        set_current_state(TASK_INTERRUPTIBLE);
1273                        spin_unlock_irq(&runtime->lock);
1274                        timeout = schedule_timeout(30 * HZ);
1275                        remove_wait_queue(&runtime->sleep, &wait);
1276                        if (signal_pending(current))
1277                                return result > 0 ? result : -ERESTARTSYS;
1278                        if (runtime->avail == last_avail && !timeout)
1279                                return result > 0 ? result : -EIO;
1280                        spin_lock_irq(&runtime->lock);
1281                }
1282                spin_unlock_irq(&runtime->lock);
1283        }
1284        return result;
1285}
1286
1287static unsigned int snd_rawmidi_poll(struct file *file, poll_table * wait)
1288{
1289        struct snd_rawmidi_file *rfile;
1290        struct snd_rawmidi_runtime *runtime;
1291        unsigned int mask;
1292
1293        rfile = file->private_data;
1294        if (rfile->input != NULL) {
1295                runtime = rfile->input->runtime;
1296                snd_rawmidi_input_trigger(rfile->input, 1);
1297                poll_wait(file, &runtime->sleep, wait);
1298        }
1299        if (rfile->output != NULL) {
1300                runtime = rfile->output->runtime;
1301                poll_wait(file, &runtime->sleep, wait);
1302        }
1303        mask = 0;
1304        if (rfile->input != NULL) {
1305                if (snd_rawmidi_ready(rfile->input))
1306                        mask |= POLLIN | POLLRDNORM;
1307        }
1308        if (rfile->output != NULL) {
1309                if (snd_rawmidi_ready(rfile->output))
1310                        mask |= POLLOUT | POLLWRNORM;
1311        }
1312        return mask;
1313}
1314
1315/*
1316 */
1317#ifdef CONFIG_COMPAT
1318#include "rawmidi_compat.c"
1319#else
1320#define snd_rawmidi_ioctl_compat        NULL
1321#endif
1322
1323/*
1324
1325 */
1326
1327static void snd_rawmidi_proc_info_read(struct snd_info_entry *entry,
1328                                       struct snd_info_buffer *buffer)
1329{
1330        struct snd_rawmidi *rmidi;
1331        struct snd_rawmidi_substream *substream;
1332        struct snd_rawmidi_runtime *runtime;
1333
1334        rmidi = entry->private_data;
1335        snd_iprintf(buffer, "%s\n\n", rmidi->name);
1336        mutex_lock(&rmidi->open_mutex);
1337        if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_OUTPUT) {
1338                list_for_each_entry(substream,
1339                                    &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams,
1340                                    list) {
1341                        snd_iprintf(buffer,
1342                                    "Output %d\n"
1343                                    "  Tx bytes     : %lu\n",
1344                                    substream->number,
1345                                    (unsigned long) substream->bytes);
1346                        if (substream->opened) {
1347                                snd_iprintf(buffer,
1348                                    "  Owner PID    : %d\n",
1349                                    pid_vnr(substream->pid));
1350                                runtime = substream->runtime;
1351                                snd_iprintf(buffer,
1352                                    "  Mode         : %s\n"
1353                                    "  Buffer size  : %lu\n"
1354                                    "  Avail        : %lu\n",
1355                                    runtime->oss ? "OSS compatible" : "native",
1356                                    (unsigned long) runtime->buffer_size,
1357                                    (unsigned long) runtime->avail);
1358                        }
1359                }
1360        }
1361        if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_INPUT) {
1362                list_for_each_entry(substream,
1363                                    &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams,
1364                                    list) {
1365                        snd_iprintf(buffer,
1366                                    "Input %d\n"
1367                                    "  Rx bytes     : %lu\n",
1368                                    substream->number,
1369                                    (unsigned long) substream->bytes);
1370                        if (substream->opened) {
1371                                snd_iprintf(buffer,
1372                                            "  Owner PID    : %d\n",
1373                                            pid_vnr(substream->pid));
1374                                runtime = substream->runtime;
1375                                snd_iprintf(buffer,
1376                                            "  Buffer size  : %lu\n"
1377                                            "  Avail        : %lu\n"
1378                                            "  Overruns     : %lu\n",
1379                                            (unsigned long) runtime->buffer_size,
1380                                            (unsigned long) runtime->avail,
1381                                            (unsigned long) runtime->xruns);
1382                        }
1383                }
1384        }
1385        mutex_unlock(&rmidi->open_mutex);
1386}
1387
1388/*
1389 *  Register functions
1390 */
1391
1392static const struct file_operations snd_rawmidi_f_ops =
1393{
1394        .owner =        THIS_MODULE,
1395        .read =         snd_rawmidi_read,
1396        .write =        snd_rawmidi_write,
1397        .open =         snd_rawmidi_open,
1398        .release =      snd_rawmidi_release,
1399        .llseek =       no_llseek,
1400        .poll =         snd_rawmidi_poll,
1401        .unlocked_ioctl =       snd_rawmidi_ioctl,
1402        .compat_ioctl = snd_rawmidi_ioctl_compat,
1403};
1404
1405static int snd_rawmidi_alloc_substreams(struct snd_rawmidi *rmidi,
1406                                        struct snd_rawmidi_str *stream,
1407                                        int direction,
1408                                        int count)
1409{
1410        struct snd_rawmidi_substream *substream;
1411        int idx;
1412
1413        for (idx = 0; idx < count; idx++) {
1414                substream = kzalloc(sizeof(*substream), GFP_KERNEL);
1415                if (substream == NULL) {
1416                        snd_printk(KERN_ERR "rawmidi: cannot allocate substream\n");
1417                        return -ENOMEM;
1418                }
1419                substream->stream = direction;
1420                substream->number = idx;
1421                substream->rmidi = rmidi;
1422                substream->pstr = stream;
1423                list_add_tail(&substream->list, &stream->substreams);
1424                stream->substream_count++;
1425        }
1426        return 0;
1427}
1428
1429/**
1430 * snd_rawmidi_new - create a rawmidi instance
1431 * @card: the card instance
1432 * @id: the id string
1433 * @device: the device index
1434 * @output_count: the number of output streams
1435 * @input_count: the number of input streams
1436 * @rrawmidi: the pointer to store the new rawmidi instance
1437 *
1438 * Creates a new rawmidi instance.
1439 * Use snd_rawmidi_set_ops() to set the operators to the new instance.
1440 *
1441 * Returns zero if successful, or a negative error code on failure.
1442 */
1443int snd_rawmidi_new(struct snd_card *card, char *id, int device,
1444                    int output_count, int input_count,
1445                    struct snd_rawmidi ** rrawmidi)
1446{
1447        struct snd_rawmidi *rmidi;
1448        int err;
1449        static struct snd_device_ops ops = {
1450                .dev_free = snd_rawmidi_dev_free,
1451                .dev_register = snd_rawmidi_dev_register,
1452                .dev_disconnect = snd_rawmidi_dev_disconnect,
1453        };
1454
1455        if (snd_BUG_ON(!card))
1456                return -ENXIO;
1457        if (rrawmidi)
1458                *rrawmidi = NULL;
1459        rmidi = kzalloc(sizeof(*rmidi), GFP_KERNEL);
1460        if (rmidi == NULL) {
1461                snd_printk(KERN_ERR "rawmidi: cannot allocate\n");
1462                return -ENOMEM;
1463        }
1464        rmidi->card = card;
1465        rmidi->device = device;
1466        mutex_init(&rmidi->open_mutex);
1467        init_waitqueue_head(&rmidi->open_wait);
1468        INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams);
1469        INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams);
1470
1471        if (id != NULL)
1472                strlcpy(rmidi->id, id, sizeof(rmidi->id));
1473        if ((err = snd_rawmidi_alloc_substreams(rmidi,
1474                                                &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT],
1475                                                SNDRV_RAWMIDI_STREAM_INPUT,
1476                                                input_count)) < 0) {
1477                snd_rawmidi_free(rmidi);
1478                return err;
1479        }
1480        if ((err = snd_rawmidi_alloc_substreams(rmidi,
1481                                                &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT],
1482                                                SNDRV_RAWMIDI_STREAM_OUTPUT,
1483                                                output_count)) < 0) {
1484                snd_rawmidi_free(rmidi);
1485                return err;
1486        }
1487        if ((err = snd_device_new(card, SNDRV_DEV_RAWMIDI, rmidi, &ops)) < 0) {
1488                snd_rawmidi_free(rmidi);
1489                return err;
1490        }
1491        if (rrawmidi)
1492                *rrawmidi = rmidi;
1493        return 0;
1494}
1495
1496static void snd_rawmidi_free_substreams(struct snd_rawmidi_str *stream)
1497{
1498        struct snd_rawmidi_substream *substream;
1499
1500        while (!list_empty(&stream->substreams)) {
1501                substream = list_entry(stream->substreams.next, struct snd_rawmidi_substream, list);
1502                list_del(&substream->list);
1503                kfree(substream);
1504        }
1505}
1506
1507static int snd_rawmidi_free(struct snd_rawmidi *rmidi)
1508{
1509        if (!rmidi)
1510                return 0;
1511
1512        snd_info_free_entry(rmidi->proc_entry);
1513        rmidi->proc_entry = NULL;
1514        mutex_lock(&register_mutex);
1515        if (rmidi->ops && rmidi->ops->dev_unregister)
1516                rmidi->ops->dev_unregister(rmidi);
1517        mutex_unlock(&register_mutex);
1518
1519        snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT]);
1520        snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT]);
1521        if (rmidi->private_free)
1522                rmidi->private_free(rmidi);
1523        kfree(rmidi);
1524        return 0;
1525}
1526
1527static int snd_rawmidi_dev_free(struct snd_device *device)
1528{
1529        struct snd_rawmidi *rmidi = device->device_data;
1530        return snd_rawmidi_free(rmidi);
1531}
1532
1533#if defined(CONFIG_SND_SEQUENCER) || (defined(MODULE) && defined(CONFIG_SND_SEQUENCER_MODULE))
1534static void snd_rawmidi_dev_seq_free(struct snd_seq_device *device)
1535{
1536        struct snd_rawmidi *rmidi = device->private_data;
1537        rmidi->seq_dev = NULL;
1538}
1539#endif
1540
1541static int snd_rawmidi_dev_register(struct snd_device *device)
1542{
1543        int err;
1544        struct snd_info_entry *entry;
1545        char name[16];
1546        struct snd_rawmidi *rmidi = device->device_data;
1547
1548        if (rmidi->device >= SNDRV_RAWMIDI_DEVICES)
1549                return -ENOMEM;
1550        mutex_lock(&register_mutex);
1551        if (snd_rawmidi_search(rmidi->card, rmidi->device)) {
1552                mutex_unlock(&register_mutex);
1553                return -EBUSY;
1554        }
1555        list_add_tail(&rmidi->list, &snd_rawmidi_devices);
1556        sprintf(name, "midiC%iD%i", rmidi->card->number, rmidi->device);
1557        if ((err = snd_register_device(SNDRV_DEVICE_TYPE_RAWMIDI,
1558                                       rmidi->card, rmidi->device,
1559                                       &snd_rawmidi_f_ops, rmidi, name)) < 0) {
1560                snd_printk(KERN_ERR "unable to register rawmidi device %i:%i\n", rmidi->card->number, rmidi->device);
1561                list_del(&rmidi->list);
1562                mutex_unlock(&register_mutex);
1563                return err;
1564        }
1565        if (rmidi->ops && rmidi->ops->dev_register &&
1566            (err = rmidi->ops->dev_register(rmidi)) < 0) {
1567                snd_unregister_device(SNDRV_DEVICE_TYPE_RAWMIDI, rmidi->card, rmidi->device);
1568                list_del(&rmidi->list);
1569                mutex_unlock(&register_mutex);
1570                return err;
1571        }
1572#ifdef CONFIG_SND_OSSEMUL
1573        rmidi->ossreg = 0;
1574        if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1575                if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1576                                            rmidi->card, 0, &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, 0);
1579                } else {
1580                        rmidi->ossreg++;
1581#ifdef SNDRV_OSS_INFO_DEV_MIDI
1582                        snd_oss_info_register(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number, rmidi->name);
1583#endif
1584                }
1585        }
1586        if ((int)rmidi->device == amidi_map[rmidi->card->number]) {
1587                if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1588                                            rmidi->card, 1, &snd_rawmidi_f_ops,
1589                                            rmidi, name) < 0) {
1590                        snd_printk(KERN_ERR "unable to register OSS rawmidi device %i:%i\n", rmidi->card->number, 1);
1591                } else {
1592                        rmidi->ossreg++;
1593                }
1594        }
1595#endif /* CONFIG_SND_OSSEMUL */
1596        mutex_unlock(&register_mutex);
1597        sprintf(name, "midi%d", rmidi->device);
1598        entry = snd_info_create_card_entry(rmidi->card, name, rmidi->card->proc_root);
1599        if (entry) {
1600                entry->private_data = rmidi;
1601                entry->c.text.read = snd_rawmidi_proc_info_read;
1602                if (snd_info_register(entry) < 0) {
1603                        snd_info_free_entry(entry);
1604                        entry = NULL;
1605                }
1606        }
1607        rmidi->proc_entry = entry;
1608#if defined(CONFIG_SND_SEQUENCER) || (defined(MODULE) && defined(CONFIG_SND_SEQUENCER_MODULE))
1609        if (!rmidi->ops || !rmidi->ops->dev_register) { /* own registration mechanism */
1610                if (snd_seq_device_new(rmidi->card, rmidi->device, SNDRV_SEQ_DEV_ID_MIDISYNTH, 0, &rmidi->seq_dev) >= 0) {
1611                        rmidi->seq_dev->private_data = rmidi;
1612                        rmidi->seq_dev->private_free = snd_rawmidi_dev_seq_free;
1613                        sprintf(rmidi->seq_dev->name, "MIDI %d-%d", rmidi->card->number, rmidi->device);
1614                        snd_device_register(rmidi->card, rmidi->seq_dev);
1615                }
1616        }
1617#endif
1618        return 0;
1619}
1620
1621static int snd_rawmidi_dev_disconnect(struct snd_device *device)
1622{
1623        struct snd_rawmidi *rmidi = device->device_data;
1624        int dir;
1625
1626        mutex_lock(&register_mutex);
1627        mutex_lock(&rmidi->open_mutex);
1628        wake_up(&rmidi->open_wait);
1629        list_del_init(&rmidi->list);
1630        for (dir = 0; dir < 2; dir++) {
1631                struct snd_rawmidi_substream *s;
1632                list_for_each_entry(s, &rmidi->streams[dir].substreams, list) {
1633                        if (s->runtime)
1634                                wake_up(&s->runtime->sleep);
1635                }
1636        }
1637
1638#ifdef CONFIG_SND_OSSEMUL
1639        if (rmidi->ossreg) {
1640                if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1641                        snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 0);
1642#ifdef SNDRV_OSS_INFO_DEV_MIDI
1643                        snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number);
1644#endif
1645                }
1646                if ((int)rmidi->device == amidi_map[rmidi->card->number])
1647                        snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 1);
1648                rmidi->ossreg = 0;
1649        }
1650#endif /* CONFIG_SND_OSSEMUL */
1651        snd_unregister_device(SNDRV_DEVICE_TYPE_RAWMIDI, rmidi->card, rmidi->device);
1652        mutex_unlock(&rmidi->open_mutex);
1653        mutex_unlock(&register_mutex);
1654        return 0;
1655}
1656
1657/**
1658 * snd_rawmidi_set_ops - set the rawmidi operators
1659 * @rmidi: the rawmidi instance
1660 * @stream: the stream direction, SNDRV_RAWMIDI_STREAM_XXX
1661 * @ops: the operator table
1662 *
1663 * Sets the rawmidi operators for the given stream direction.
1664 */
1665void snd_rawmidi_set_ops(struct snd_rawmidi *rmidi, int stream,
1666                         struct snd_rawmidi_ops *ops)
1667{
1668        struct snd_rawmidi_substream *substream;
1669        
1670        list_for_each_entry(substream, &rmidi->streams[stream].substreams, list)
1671                substream->ops = ops;
1672}
1673
1674/*
1675 *  ENTRY functions
1676 */
1677
1678static int __init alsa_rawmidi_init(void)
1679{
1680
1681        snd_ctl_register_ioctl(snd_rawmidi_control_ioctl);
1682        snd_ctl_register_ioctl_compat(snd_rawmidi_control_ioctl);
1683#ifdef CONFIG_SND_OSSEMUL
1684        { int i;
1685        /* check device map table */
1686        for (i = 0; i < SNDRV_CARDS; i++) {
1687                if (midi_map[i] < 0 || midi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1688                        snd_printk(KERN_ERR "invalid midi_map[%d] = %d\n", i, midi_map[i]);
1689                        midi_map[i] = 0;
1690                }
1691                if (amidi_map[i] < 0 || amidi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1692                        snd_printk(KERN_ERR "invalid amidi_map[%d] = %d\n", i, amidi_map[i]);
1693                        amidi_map[i] = 1;
1694                }
1695        }
1696        }
1697#endif /* CONFIG_SND_OSSEMUL */
1698        return 0;
1699}
1700
1701static void __exit alsa_rawmidi_exit(void)
1702{
1703        snd_ctl_unregister_ioctl(snd_rawmidi_control_ioctl);
1704        snd_ctl_unregister_ioctl_compat(snd_rawmidi_control_ioctl);
1705}
1706
1707module_init(alsa_rawmidi_init)
1708module_exit(alsa_rawmidi_exit)
1709
1710EXPORT_SYMBOL(snd_rawmidi_output_params);
1711EXPORT_SYMBOL(snd_rawmidi_input_params);
1712EXPORT_SYMBOL(snd_rawmidi_drop_output);
1713EXPORT_SYMBOL(snd_rawmidi_drain_output);
1714EXPORT_SYMBOL(snd_rawmidi_drain_input);
1715EXPORT_SYMBOL(snd_rawmidi_receive);
1716EXPORT_SYMBOL(snd_rawmidi_transmit_empty);
1717EXPORT_SYMBOL(snd_rawmidi_transmit_peek);
1718EXPORT_SYMBOL(snd_rawmidi_transmit_ack);
1719EXPORT_SYMBOL(snd_rawmidi_transmit);
1720EXPORT_SYMBOL(snd_rawmidi_new);
1721EXPORT_SYMBOL(snd_rawmidi_set_ops);
1722EXPORT_SYMBOL(snd_rawmidi_info_select);
1723EXPORT_SYMBOL(snd_rawmidi_kernel_open);
1724EXPORT_SYMBOL(snd_rawmidi_kernel_release);
1725EXPORT_SYMBOL(snd_rawmidi_kernel_read);
1726EXPORT_SYMBOL(snd_rawmidi_kernel_write);
1727
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