linux/sound/core/rawmidi.c
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   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 *  Abstract layer for MIDI v1.0 stream
   4 *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
   5 */
   6
   7#include <sound/core.h>
   8#include <linux/major.h>
   9#include <linux/init.h>
  10#include <linux/sched/signal.h>
  11#include <linux/slab.h>
  12#include <linux/time.h>
  13#include <linux/wait.h>
  14#include <linux/mutex.h>
  15#include <linux/module.h>
  16#include <linux/delay.h>
  17#include <linux/mm.h>
  18#include <linux/nospec.h>
  19#include <sound/rawmidi.h>
  20#include <sound/info.h>
  21#include <sound/control.h>
  22#include <sound/minors.h>
  23#include <sound/initval.h>
  24
  25MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
  26MODULE_DESCRIPTION("Midlevel RawMidi code for ALSA.");
  27MODULE_LICENSE("GPL");
  28
  29#ifdef CONFIG_SND_OSSEMUL
  30static int midi_map[SNDRV_CARDS];
  31static int amidi_map[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS-1)] = 1};
  32module_param_array(midi_map, int, NULL, 0444);
  33MODULE_PARM_DESC(midi_map, "Raw MIDI device number assigned to 1st OSS device.");
  34module_param_array(amidi_map, int, NULL, 0444);
  35MODULE_PARM_DESC(amidi_map, "Raw MIDI device number assigned to 2nd OSS device.");
  36#endif /* CONFIG_SND_OSSEMUL */
  37
  38static int snd_rawmidi_free(struct snd_rawmidi *rmidi);
  39static int snd_rawmidi_dev_free(struct snd_device *device);
  40static int snd_rawmidi_dev_register(struct snd_device *device);
  41static int snd_rawmidi_dev_disconnect(struct snd_device *device);
  42
  43static LIST_HEAD(snd_rawmidi_devices);
  44static DEFINE_MUTEX(register_mutex);
  45
  46#define rmidi_err(rmidi, fmt, args...) \
  47        dev_err(&(rmidi)->dev, fmt, ##args)
  48#define rmidi_warn(rmidi, fmt, args...) \
  49        dev_warn(&(rmidi)->dev, fmt, ##args)
  50#define rmidi_dbg(rmidi, fmt, args...) \
  51        dev_dbg(&(rmidi)->dev, fmt, ##args)
  52
  53struct snd_rawmidi_status32 {
  54        s32 stream;
  55        s32 tstamp_sec;                 /* Timestamp */
  56        s32 tstamp_nsec;
  57        u32 avail;                      /* available bytes */
  58        u32 xruns;                      /* count of overruns since last status (in bytes) */
  59        unsigned char reserved[16];     /* reserved for future use */
  60};
  61
  62#define SNDRV_RAWMIDI_IOCTL_STATUS32    _IOWR('W', 0x20, struct snd_rawmidi_status32)
  63
  64struct snd_rawmidi_status64 {
  65        int stream;
  66        u8 rsvd[4];                     /* alignment */
  67        s64 tstamp_sec;                 /* Timestamp */
  68        s64 tstamp_nsec;
  69        size_t avail;                   /* available bytes */
  70        size_t xruns;                   /* count of overruns since last status (in bytes) */
  71        unsigned char reserved[16];     /* reserved for future use */
  72};
  73
  74#define SNDRV_RAWMIDI_IOCTL_STATUS64    _IOWR('W', 0x20, struct snd_rawmidi_status64)
  75
  76static struct snd_rawmidi *snd_rawmidi_search(struct snd_card *card, int device)
  77{
  78        struct snd_rawmidi *rawmidi;
  79
  80        list_for_each_entry(rawmidi, &snd_rawmidi_devices, list)
  81                if (rawmidi->card == card && rawmidi->device == device)
  82                        return rawmidi;
  83        return NULL;
  84}
  85
  86static inline unsigned short snd_rawmidi_file_flags(struct file *file)
  87{
  88        switch (file->f_mode & (FMODE_READ | FMODE_WRITE)) {
  89        case FMODE_WRITE:
  90                return SNDRV_RAWMIDI_LFLG_OUTPUT;
  91        case FMODE_READ:
  92                return SNDRV_RAWMIDI_LFLG_INPUT;
  93        default:
  94                return SNDRV_RAWMIDI_LFLG_OPEN;
  95        }
  96}
  97
  98static inline int snd_rawmidi_ready(struct snd_rawmidi_substream *substream)
  99{
 100        struct snd_rawmidi_runtime *runtime = substream->runtime;
 101
 102        return runtime->avail >= runtime->avail_min;
 103}
 104
 105static inline int snd_rawmidi_ready_append(struct snd_rawmidi_substream *substream,
 106                                           size_t count)
 107{
 108        struct snd_rawmidi_runtime *runtime = substream->runtime;
 109
 110        return runtime->avail >= runtime->avail_min &&
 111               (!substream->append || runtime->avail >= count);
 112}
 113
 114static void snd_rawmidi_input_event_work(struct work_struct *work)
 115{
 116        struct snd_rawmidi_runtime *runtime =
 117                container_of(work, struct snd_rawmidi_runtime, event_work);
 118
 119        if (runtime->event)
 120                runtime->event(runtime->substream);
 121}
 122
 123/* buffer refcount management: call with runtime->lock held */
 124static inline void snd_rawmidi_buffer_ref(struct snd_rawmidi_runtime *runtime)
 125{
 126        runtime->buffer_ref++;
 127}
 128
 129static inline void snd_rawmidi_buffer_unref(struct snd_rawmidi_runtime *runtime)
 130{
 131        runtime->buffer_ref--;
 132}
 133
 134static int snd_rawmidi_runtime_create(struct snd_rawmidi_substream *substream)
 135{
 136        struct snd_rawmidi_runtime *runtime;
 137
 138        runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
 139        if (!runtime)
 140                return -ENOMEM;
 141        runtime->substream = substream;
 142        spin_lock_init(&runtime->lock);
 143        init_waitqueue_head(&runtime->sleep);
 144        INIT_WORK(&runtime->event_work, snd_rawmidi_input_event_work);
 145        runtime->event = NULL;
 146        runtime->buffer_size = PAGE_SIZE;
 147        runtime->avail_min = 1;
 148        if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
 149                runtime->avail = 0;
 150        else
 151                runtime->avail = runtime->buffer_size;
 152        runtime->buffer = kvzalloc(runtime->buffer_size, GFP_KERNEL);
 153        if (!runtime->buffer) {
 154                kfree(runtime);
 155                return -ENOMEM;
 156        }
 157        runtime->appl_ptr = runtime->hw_ptr = 0;
 158        substream->runtime = runtime;
 159        return 0;
 160}
 161
 162static int snd_rawmidi_runtime_free(struct snd_rawmidi_substream *substream)
 163{
 164        struct snd_rawmidi_runtime *runtime = substream->runtime;
 165
 166        kvfree(runtime->buffer);
 167        kfree(runtime);
 168        substream->runtime = NULL;
 169        return 0;
 170}
 171
 172static inline void snd_rawmidi_output_trigger(struct snd_rawmidi_substream *substream, int up)
 173{
 174        if (!substream->opened)
 175                return;
 176        substream->ops->trigger(substream, up);
 177}
 178
 179static void snd_rawmidi_input_trigger(struct snd_rawmidi_substream *substream, int up)
 180{
 181        if (!substream->opened)
 182                return;
 183        substream->ops->trigger(substream, up);
 184        if (!up)
 185                cancel_work_sync(&substream->runtime->event_work);
 186}
 187
 188static void __reset_runtime_ptrs(struct snd_rawmidi_runtime *runtime,
 189                                 bool is_input)
 190{
 191        runtime->drain = 0;
 192        runtime->appl_ptr = runtime->hw_ptr = 0;
 193        runtime->avail = is_input ? 0 : runtime->buffer_size;
 194}
 195
 196static void reset_runtime_ptrs(struct snd_rawmidi_runtime *runtime,
 197                               bool is_input)
 198{
 199        unsigned long flags;
 200
 201        spin_lock_irqsave(&runtime->lock, flags);
 202        __reset_runtime_ptrs(runtime, is_input);
 203        spin_unlock_irqrestore(&runtime->lock, flags);
 204}
 205
 206int snd_rawmidi_drop_output(struct snd_rawmidi_substream *substream)
 207{
 208        snd_rawmidi_output_trigger(substream, 0);
 209        reset_runtime_ptrs(substream->runtime, false);
 210        return 0;
 211}
 212EXPORT_SYMBOL(snd_rawmidi_drop_output);
 213
 214int snd_rawmidi_drain_output(struct snd_rawmidi_substream *substream)
 215{
 216        int err;
 217        long timeout;
 218        struct snd_rawmidi_runtime *runtime = substream->runtime;
 219
 220        err = 0;
 221        runtime->drain = 1;
 222        timeout = wait_event_interruptible_timeout(runtime->sleep,
 223                                (runtime->avail >= runtime->buffer_size),
 224                                10*HZ);
 225        if (signal_pending(current))
 226                err = -ERESTARTSYS;
 227        if (runtime->avail < runtime->buffer_size && !timeout) {
 228                rmidi_warn(substream->rmidi,
 229                           "rawmidi drain error (avail = %li, buffer_size = %li)\n",
 230                           (long)runtime->avail, (long)runtime->buffer_size);
 231                err = -EIO;
 232        }
 233        runtime->drain = 0;
 234        if (err != -ERESTARTSYS) {
 235                /* we need wait a while to make sure that Tx FIFOs are empty */
 236                if (substream->ops->drain)
 237                        substream->ops->drain(substream);
 238                else
 239                        msleep(50);
 240                snd_rawmidi_drop_output(substream);
 241        }
 242        return err;
 243}
 244EXPORT_SYMBOL(snd_rawmidi_drain_output);
 245
 246int snd_rawmidi_drain_input(struct snd_rawmidi_substream *substream)
 247{
 248        snd_rawmidi_input_trigger(substream, 0);
 249        reset_runtime_ptrs(substream->runtime, true);
 250        return 0;
 251}
 252EXPORT_SYMBOL(snd_rawmidi_drain_input);
 253
 254/* look for an available substream for the given stream direction;
 255 * if a specific subdevice is given, try to assign it
 256 */
 257static int assign_substream(struct snd_rawmidi *rmidi, int subdevice,
 258                            int stream, int mode,
 259                            struct snd_rawmidi_substream **sub_ret)
 260{
 261        struct snd_rawmidi_substream *substream;
 262        struct snd_rawmidi_str *s = &rmidi->streams[stream];
 263        static const unsigned int info_flags[2] = {
 264                [SNDRV_RAWMIDI_STREAM_OUTPUT] = SNDRV_RAWMIDI_INFO_OUTPUT,
 265                [SNDRV_RAWMIDI_STREAM_INPUT] = SNDRV_RAWMIDI_INFO_INPUT,
 266        };
 267
 268        if (!(rmidi->info_flags & info_flags[stream]))
 269                return -ENXIO;
 270        if (subdevice >= 0 && subdevice >= s->substream_count)
 271                return -ENODEV;
 272
 273        list_for_each_entry(substream, &s->substreams, list) {
 274                if (substream->opened) {
 275                        if (stream == SNDRV_RAWMIDI_STREAM_INPUT ||
 276                            !(mode & SNDRV_RAWMIDI_LFLG_APPEND) ||
 277                            !substream->append)
 278                                continue;
 279                }
 280                if (subdevice < 0 || subdevice == substream->number) {
 281                        *sub_ret = substream;
 282                        return 0;
 283                }
 284        }
 285        return -EAGAIN;
 286}
 287
 288/* open and do ref-counting for the given substream */
 289static int open_substream(struct snd_rawmidi *rmidi,
 290                          struct snd_rawmidi_substream *substream,
 291                          int mode)
 292{
 293        int err;
 294
 295        if (substream->use_count == 0) {
 296                err = snd_rawmidi_runtime_create(substream);
 297                if (err < 0)
 298                        return err;
 299                err = substream->ops->open(substream);
 300                if (err < 0) {
 301                        snd_rawmidi_runtime_free(substream);
 302                        return err;
 303                }
 304                substream->opened = 1;
 305                substream->active_sensing = 0;
 306                if (mode & SNDRV_RAWMIDI_LFLG_APPEND)
 307                        substream->append = 1;
 308                substream->pid = get_pid(task_pid(current));
 309                rmidi->streams[substream->stream].substream_opened++;
 310        }
 311        substream->use_count++;
 312        return 0;
 313}
 314
 315static void close_substream(struct snd_rawmidi *rmidi,
 316                            struct snd_rawmidi_substream *substream,
 317                            int cleanup);
 318
 319static int rawmidi_open_priv(struct snd_rawmidi *rmidi, int subdevice, int mode,
 320                             struct snd_rawmidi_file *rfile)
 321{
 322        struct snd_rawmidi_substream *sinput = NULL, *soutput = NULL;
 323        int err;
 324
 325        rfile->input = rfile->output = NULL;
 326        if (mode & SNDRV_RAWMIDI_LFLG_INPUT) {
 327                err = assign_substream(rmidi, subdevice,
 328                                       SNDRV_RAWMIDI_STREAM_INPUT,
 329                                       mode, &sinput);
 330                if (err < 0)
 331                        return err;
 332        }
 333        if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) {
 334                err = assign_substream(rmidi, subdevice,
 335                                       SNDRV_RAWMIDI_STREAM_OUTPUT,
 336                                       mode, &soutput);
 337                if (err < 0)
 338                        return err;
 339        }
 340
 341        if (sinput) {
 342                err = open_substream(rmidi, sinput, mode);
 343                if (err < 0)
 344                        return err;
 345        }
 346        if (soutput) {
 347                err = open_substream(rmidi, soutput, mode);
 348                if (err < 0) {
 349                        if (sinput)
 350                                close_substream(rmidi, sinput, 0);
 351                        return err;
 352                }
 353        }
 354
 355        rfile->rmidi = rmidi;
 356        rfile->input = sinput;
 357        rfile->output = soutput;
 358        return 0;
 359}
 360
 361/* called from sound/core/seq/seq_midi.c */
 362int snd_rawmidi_kernel_open(struct snd_card *card, int device, int subdevice,
 363                            int mode, struct snd_rawmidi_file *rfile)
 364{
 365        struct snd_rawmidi *rmidi;
 366        int err = 0;
 367
 368        if (snd_BUG_ON(!rfile))
 369                return -EINVAL;
 370
 371        mutex_lock(&register_mutex);
 372        rmidi = snd_rawmidi_search(card, device);
 373        if (!rmidi)
 374                err = -ENODEV;
 375        else if (!try_module_get(rmidi->card->module))
 376                err = -ENXIO;
 377        mutex_unlock(&register_mutex);
 378        if (err < 0)
 379                return err;
 380
 381        mutex_lock(&rmidi->open_mutex);
 382        err = rawmidi_open_priv(rmidi, subdevice, mode, rfile);
 383        mutex_unlock(&rmidi->open_mutex);
 384        if (err < 0)
 385                module_put(rmidi->card->module);
 386        return err;
 387}
 388EXPORT_SYMBOL(snd_rawmidi_kernel_open);
 389
 390static int snd_rawmidi_open(struct inode *inode, struct file *file)
 391{
 392        int maj = imajor(inode);
 393        struct snd_card *card;
 394        int subdevice;
 395        unsigned short fflags;
 396        int err;
 397        struct snd_rawmidi *rmidi;
 398        struct snd_rawmidi_file *rawmidi_file = NULL;
 399        wait_queue_entry_t wait;
 400
 401        if ((file->f_flags & O_APPEND) && !(file->f_flags & O_NONBLOCK))
 402                return -EINVAL;         /* invalid combination */
 403
 404        err = stream_open(inode, file);
 405        if (err < 0)
 406                return err;
 407
 408        if (maj == snd_major) {
 409                rmidi = snd_lookup_minor_data(iminor(inode),
 410                                              SNDRV_DEVICE_TYPE_RAWMIDI);
 411#ifdef CONFIG_SND_OSSEMUL
 412        } else if (maj == SOUND_MAJOR) {
 413                rmidi = snd_lookup_oss_minor_data(iminor(inode),
 414                                                  SNDRV_OSS_DEVICE_TYPE_MIDI);
 415#endif
 416        } else
 417                return -ENXIO;
 418
 419        if (rmidi == NULL)
 420                return -ENODEV;
 421
 422        if (!try_module_get(rmidi->card->module)) {
 423                snd_card_unref(rmidi->card);
 424                return -ENXIO;
 425        }
 426
 427        mutex_lock(&rmidi->open_mutex);
 428        card = rmidi->card;
 429        err = snd_card_file_add(card, file);
 430        if (err < 0)
 431                goto __error_card;
 432        fflags = snd_rawmidi_file_flags(file);
 433        if ((file->f_flags & O_APPEND) || maj == SOUND_MAJOR) /* OSS emul? */
 434                fflags |= SNDRV_RAWMIDI_LFLG_APPEND;
 435        rawmidi_file = kmalloc(sizeof(*rawmidi_file), GFP_KERNEL);
 436        if (rawmidi_file == NULL) {
 437                err = -ENOMEM;
 438                goto __error;
 439        }
 440        init_waitqueue_entry(&wait, current);
 441        add_wait_queue(&rmidi->open_wait, &wait);
 442        while (1) {
 443                subdevice = snd_ctl_get_preferred_subdevice(card, SND_CTL_SUBDEV_RAWMIDI);
 444                err = rawmidi_open_priv(rmidi, subdevice, fflags, rawmidi_file);
 445                if (err >= 0)
 446                        break;
 447                if (err == -EAGAIN) {
 448                        if (file->f_flags & O_NONBLOCK) {
 449                                err = -EBUSY;
 450                                break;
 451                        }
 452                } else
 453                        break;
 454                set_current_state(TASK_INTERRUPTIBLE);
 455                mutex_unlock(&rmidi->open_mutex);
 456                schedule();
 457                mutex_lock(&rmidi->open_mutex);
 458                if (rmidi->card->shutdown) {
 459                        err = -ENODEV;
 460                        break;
 461                }
 462                if (signal_pending(current)) {
 463                        err = -ERESTARTSYS;
 464                        break;
 465                }
 466        }
 467        remove_wait_queue(&rmidi->open_wait, &wait);
 468        if (err < 0) {
 469                kfree(rawmidi_file);
 470                goto __error;
 471        }
 472#ifdef CONFIG_SND_OSSEMUL
 473        if (rawmidi_file->input && rawmidi_file->input->runtime)
 474                rawmidi_file->input->runtime->oss = (maj == SOUND_MAJOR);
 475        if (rawmidi_file->output && rawmidi_file->output->runtime)
 476                rawmidi_file->output->runtime->oss = (maj == SOUND_MAJOR);
 477#endif
 478        file->private_data = rawmidi_file;
 479        mutex_unlock(&rmidi->open_mutex);
 480        snd_card_unref(rmidi->card);
 481        return 0;
 482
 483 __error:
 484        snd_card_file_remove(card, file);
 485 __error_card:
 486        mutex_unlock(&rmidi->open_mutex);
 487        module_put(rmidi->card->module);
 488        snd_card_unref(rmidi->card);
 489        return err;
 490}
 491
 492static void close_substream(struct snd_rawmidi *rmidi,
 493                            struct snd_rawmidi_substream *substream,
 494                            int cleanup)
 495{
 496        if (--substream->use_count)
 497                return;
 498
 499        if (cleanup) {
 500                if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
 501                        snd_rawmidi_input_trigger(substream, 0);
 502                else {
 503                        if (substream->active_sensing) {
 504                                unsigned char buf = 0xfe;
 505                                /* sending single active sensing message
 506                                 * to shut the device up
 507                                 */
 508                                snd_rawmidi_kernel_write(substream, &buf, 1);
 509                        }
 510                        if (snd_rawmidi_drain_output(substream) == -ERESTARTSYS)
 511                                snd_rawmidi_output_trigger(substream, 0);
 512                }
 513        }
 514        substream->ops->close(substream);
 515        if (substream->runtime->private_free)
 516                substream->runtime->private_free(substream);
 517        snd_rawmidi_runtime_free(substream);
 518        substream->opened = 0;
 519        substream->append = 0;
 520        put_pid(substream->pid);
 521        substream->pid = NULL;
 522        rmidi->streams[substream->stream].substream_opened--;
 523}
 524
 525static void rawmidi_release_priv(struct snd_rawmidi_file *rfile)
 526{
 527        struct snd_rawmidi *rmidi;
 528
 529        rmidi = rfile->rmidi;
 530        mutex_lock(&rmidi->open_mutex);
 531        if (rfile->input) {
 532                close_substream(rmidi, rfile->input, 1);
 533                rfile->input = NULL;
 534        }
 535        if (rfile->output) {
 536                close_substream(rmidi, rfile->output, 1);
 537                rfile->output = NULL;
 538        }
 539        rfile->rmidi = NULL;
 540        mutex_unlock(&rmidi->open_mutex);
 541        wake_up(&rmidi->open_wait);
 542}
 543
 544/* called from sound/core/seq/seq_midi.c */
 545int snd_rawmidi_kernel_release(struct snd_rawmidi_file *rfile)
 546{
 547        struct snd_rawmidi *rmidi;
 548
 549        if (snd_BUG_ON(!rfile))
 550                return -ENXIO;
 551
 552        rmidi = rfile->rmidi;
 553        rawmidi_release_priv(rfile);
 554        module_put(rmidi->card->module);
 555        return 0;
 556}
 557EXPORT_SYMBOL(snd_rawmidi_kernel_release);
 558
 559static int snd_rawmidi_release(struct inode *inode, struct file *file)
 560{
 561        struct snd_rawmidi_file *rfile;
 562        struct snd_rawmidi *rmidi;
 563        struct module *module;
 564
 565        rfile = file->private_data;
 566        rmidi = rfile->rmidi;
 567        rawmidi_release_priv(rfile);
 568        kfree(rfile);
 569        module = rmidi->card->module;
 570        snd_card_file_remove(rmidi->card, file);
 571        module_put(module);
 572        return 0;
 573}
 574
 575static int snd_rawmidi_info(struct snd_rawmidi_substream *substream,
 576                            struct snd_rawmidi_info *info)
 577{
 578        struct snd_rawmidi *rmidi;
 579
 580        if (substream == NULL)
 581                return -ENODEV;
 582        rmidi = substream->rmidi;
 583        memset(info, 0, sizeof(*info));
 584        info->card = rmidi->card->number;
 585        info->device = rmidi->device;
 586        info->subdevice = substream->number;
 587        info->stream = substream->stream;
 588        info->flags = rmidi->info_flags;
 589        strcpy(info->id, rmidi->id);
 590        strcpy(info->name, rmidi->name);
 591        strcpy(info->subname, substream->name);
 592        info->subdevices_count = substream->pstr->substream_count;
 593        info->subdevices_avail = (substream->pstr->substream_count -
 594                                  substream->pstr->substream_opened);
 595        return 0;
 596}
 597
 598static int snd_rawmidi_info_user(struct snd_rawmidi_substream *substream,
 599                                 struct snd_rawmidi_info __user *_info)
 600{
 601        struct snd_rawmidi_info info;
 602        int err;
 603
 604        err = snd_rawmidi_info(substream, &info);
 605        if (err < 0)
 606                return err;
 607        if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
 608                return -EFAULT;
 609        return 0;
 610}
 611
 612static int __snd_rawmidi_info_select(struct snd_card *card,
 613                                     struct snd_rawmidi_info *info)
 614{
 615        struct snd_rawmidi *rmidi;
 616        struct snd_rawmidi_str *pstr;
 617        struct snd_rawmidi_substream *substream;
 618
 619        rmidi = snd_rawmidi_search(card, info->device);
 620        if (!rmidi)
 621                return -ENXIO;
 622        if (info->stream < 0 || info->stream > 1)
 623                return -EINVAL;
 624        info->stream = array_index_nospec(info->stream, 2);
 625        pstr = &rmidi->streams[info->stream];
 626        if (pstr->substream_count == 0)
 627                return -ENOENT;
 628        if (info->subdevice >= pstr->substream_count)
 629                return -ENXIO;
 630        list_for_each_entry(substream, &pstr->substreams, list) {
 631                if ((unsigned int)substream->number == info->subdevice)
 632                        return snd_rawmidi_info(substream, info);
 633        }
 634        return -ENXIO;
 635}
 636
 637int snd_rawmidi_info_select(struct snd_card *card, struct snd_rawmidi_info *info)
 638{
 639        int ret;
 640
 641        mutex_lock(&register_mutex);
 642        ret = __snd_rawmidi_info_select(card, info);
 643        mutex_unlock(&register_mutex);
 644        return ret;
 645}
 646EXPORT_SYMBOL(snd_rawmidi_info_select);
 647
 648static int snd_rawmidi_info_select_user(struct snd_card *card,
 649                                        struct snd_rawmidi_info __user *_info)
 650{
 651        int err;
 652        struct snd_rawmidi_info info;
 653
 654        if (get_user(info.device, &_info->device))
 655                return -EFAULT;
 656        if (get_user(info.stream, &_info->stream))
 657                return -EFAULT;
 658        if (get_user(info.subdevice, &_info->subdevice))
 659                return -EFAULT;
 660        err = snd_rawmidi_info_select(card, &info);
 661        if (err < 0)
 662                return err;
 663        if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
 664                return -EFAULT;
 665        return 0;
 666}
 667
 668static int resize_runtime_buffer(struct snd_rawmidi_runtime *runtime,
 669                                 struct snd_rawmidi_params *params,
 670                                 bool is_input)
 671{
 672        char *newbuf, *oldbuf;
 673
 674        if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L)
 675                return -EINVAL;
 676        if (params->avail_min < 1 || params->avail_min > params->buffer_size)
 677                return -EINVAL;
 678        if (params->buffer_size != runtime->buffer_size) {
 679                newbuf = kvzalloc(params->buffer_size, GFP_KERNEL);
 680                if (!newbuf)
 681                        return -ENOMEM;
 682                spin_lock_irq(&runtime->lock);
 683                if (runtime->buffer_ref) {
 684                        spin_unlock_irq(&runtime->lock);
 685                        kvfree(newbuf);
 686                        return -EBUSY;
 687                }
 688                oldbuf = runtime->buffer;
 689                runtime->buffer = newbuf;
 690                runtime->buffer_size = params->buffer_size;
 691                __reset_runtime_ptrs(runtime, is_input);
 692                spin_unlock_irq(&runtime->lock);
 693                kvfree(oldbuf);
 694        }
 695        runtime->avail_min = params->avail_min;
 696        return 0;
 697}
 698
 699int snd_rawmidi_output_params(struct snd_rawmidi_substream *substream,
 700                              struct snd_rawmidi_params *params)
 701{
 702        if (substream->append && substream->use_count > 1)
 703                return -EBUSY;
 704        snd_rawmidi_drain_output(substream);
 705        substream->active_sensing = !params->no_active_sensing;
 706        return resize_runtime_buffer(substream->runtime, params, false);
 707}
 708EXPORT_SYMBOL(snd_rawmidi_output_params);
 709
 710int snd_rawmidi_input_params(struct snd_rawmidi_substream *substream,
 711                             struct snd_rawmidi_params *params)
 712{
 713        snd_rawmidi_drain_input(substream);
 714        return resize_runtime_buffer(substream->runtime, params, true);
 715}
 716EXPORT_SYMBOL(snd_rawmidi_input_params);
 717
 718static int snd_rawmidi_output_status(struct snd_rawmidi_substream *substream,
 719                                     struct snd_rawmidi_status64 *status)
 720{
 721        struct snd_rawmidi_runtime *runtime = substream->runtime;
 722
 723        memset(status, 0, sizeof(*status));
 724        status->stream = SNDRV_RAWMIDI_STREAM_OUTPUT;
 725        spin_lock_irq(&runtime->lock);
 726        status->avail = runtime->avail;
 727        spin_unlock_irq(&runtime->lock);
 728        return 0;
 729}
 730
 731static int snd_rawmidi_input_status(struct snd_rawmidi_substream *substream,
 732                                    struct snd_rawmidi_status64 *status)
 733{
 734        struct snd_rawmidi_runtime *runtime = substream->runtime;
 735
 736        memset(status, 0, sizeof(*status));
 737        status->stream = SNDRV_RAWMIDI_STREAM_INPUT;
 738        spin_lock_irq(&runtime->lock);
 739        status->avail = runtime->avail;
 740        status->xruns = runtime->xruns;
 741        runtime->xruns = 0;
 742        spin_unlock_irq(&runtime->lock);
 743        return 0;
 744}
 745
 746static int snd_rawmidi_ioctl_status32(struct snd_rawmidi_file *rfile,
 747                                      struct snd_rawmidi_status32 __user *argp)
 748{
 749        int err = 0;
 750        struct snd_rawmidi_status32 __user *status = argp;
 751        struct snd_rawmidi_status32 status32;
 752        struct snd_rawmidi_status64 status64;
 753
 754        if (copy_from_user(&status32, argp,
 755                           sizeof(struct snd_rawmidi_status32)))
 756                return -EFAULT;
 757
 758        switch (status32.stream) {
 759        case SNDRV_RAWMIDI_STREAM_OUTPUT:
 760                if (rfile->output == NULL)
 761                        return -EINVAL;
 762                err = snd_rawmidi_output_status(rfile->output, &status64);
 763                break;
 764        case SNDRV_RAWMIDI_STREAM_INPUT:
 765                if (rfile->input == NULL)
 766                        return -EINVAL;
 767                err = snd_rawmidi_input_status(rfile->input, &status64);
 768                break;
 769        default:
 770                return -EINVAL;
 771        }
 772        if (err < 0)
 773                return err;
 774
 775        status32 = (struct snd_rawmidi_status32) {
 776                .stream = status64.stream,
 777                .tstamp_sec = status64.tstamp_sec,
 778                .tstamp_nsec = status64.tstamp_nsec,
 779                .avail = status64.avail,
 780                .xruns = status64.xruns,
 781        };
 782
 783        if (copy_to_user(status, &status32, sizeof(*status)))
 784                return -EFAULT;
 785
 786        return 0;
 787}
 788
 789static int snd_rawmidi_ioctl_status64(struct snd_rawmidi_file *rfile,
 790                                      struct snd_rawmidi_status64 __user *argp)
 791{
 792        int err = 0;
 793        struct snd_rawmidi_status64 status;
 794
 795        if (copy_from_user(&status, argp, sizeof(struct snd_rawmidi_status64)))
 796                return -EFAULT;
 797
 798        switch (status.stream) {
 799        case SNDRV_RAWMIDI_STREAM_OUTPUT:
 800                if (rfile->output == NULL)
 801                        return -EINVAL;
 802                err = snd_rawmidi_output_status(rfile->output, &status);
 803                break;
 804        case SNDRV_RAWMIDI_STREAM_INPUT:
 805                if (rfile->input == NULL)
 806                        return -EINVAL;
 807                err = snd_rawmidi_input_status(rfile->input, &status);
 808                break;
 809        default:
 810                return -EINVAL;
 811        }
 812        if (err < 0)
 813                return err;
 814        if (copy_to_user(argp, &status,
 815                         sizeof(struct snd_rawmidi_status64)))
 816                return -EFAULT;
 817        return 0;
 818}
 819
 820static long snd_rawmidi_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 821{
 822        struct snd_rawmidi_file *rfile;
 823        void __user *argp = (void __user *)arg;
 824
 825        rfile = file->private_data;
 826        if (((cmd >> 8) & 0xff) != 'W')
 827                return -ENOTTY;
 828        switch (cmd) {
 829        case SNDRV_RAWMIDI_IOCTL_PVERSION:
 830                return put_user(SNDRV_RAWMIDI_VERSION, (int __user *)argp) ? -EFAULT : 0;
 831        case SNDRV_RAWMIDI_IOCTL_INFO:
 832        {
 833                int stream;
 834                struct snd_rawmidi_info __user *info = argp;
 835
 836                if (get_user(stream, &info->stream))
 837                        return -EFAULT;
 838                switch (stream) {
 839                case SNDRV_RAWMIDI_STREAM_INPUT:
 840                        return snd_rawmidi_info_user(rfile->input, info);
 841                case SNDRV_RAWMIDI_STREAM_OUTPUT:
 842                        return snd_rawmidi_info_user(rfile->output, info);
 843                default:
 844                        return -EINVAL;
 845                }
 846        }
 847        case SNDRV_RAWMIDI_IOCTL_PARAMS:
 848        {
 849                struct snd_rawmidi_params params;
 850
 851                if (copy_from_user(&params, argp, sizeof(struct snd_rawmidi_params)))
 852                        return -EFAULT;
 853                switch (params.stream) {
 854                case SNDRV_RAWMIDI_STREAM_OUTPUT:
 855                        if (rfile->output == NULL)
 856                                return -EINVAL;
 857                        return snd_rawmidi_output_params(rfile->output, &params);
 858                case SNDRV_RAWMIDI_STREAM_INPUT:
 859                        if (rfile->input == NULL)
 860                                return -EINVAL;
 861                        return snd_rawmidi_input_params(rfile->input, &params);
 862                default:
 863                        return -EINVAL;
 864                }
 865        }
 866        case SNDRV_RAWMIDI_IOCTL_STATUS32:
 867                return snd_rawmidi_ioctl_status32(rfile, argp);
 868        case SNDRV_RAWMIDI_IOCTL_STATUS64:
 869                return snd_rawmidi_ioctl_status64(rfile, argp);
 870        case SNDRV_RAWMIDI_IOCTL_DROP:
 871        {
 872                int val;
 873
 874                if (get_user(val, (int __user *) argp))
 875                        return -EFAULT;
 876                switch (val) {
 877                case SNDRV_RAWMIDI_STREAM_OUTPUT:
 878                        if (rfile->output == NULL)
 879                                return -EINVAL;
 880                        return snd_rawmidi_drop_output(rfile->output);
 881                default:
 882                        return -EINVAL;
 883                }
 884        }
 885        case SNDRV_RAWMIDI_IOCTL_DRAIN:
 886        {
 887                int val;
 888
 889                if (get_user(val, (int __user *) argp))
 890                        return -EFAULT;
 891                switch (val) {
 892                case SNDRV_RAWMIDI_STREAM_OUTPUT:
 893                        if (rfile->output == NULL)
 894                                return -EINVAL;
 895                        return snd_rawmidi_drain_output(rfile->output);
 896                case SNDRV_RAWMIDI_STREAM_INPUT:
 897                        if (rfile->input == NULL)
 898                                return -EINVAL;
 899                        return snd_rawmidi_drain_input(rfile->input);
 900                default:
 901                        return -EINVAL;
 902                }
 903        }
 904        default:
 905                rmidi_dbg(rfile->rmidi,
 906                          "rawmidi: unknown command = 0x%x\n", cmd);
 907        }
 908        return -ENOTTY;
 909}
 910
 911static int snd_rawmidi_control_ioctl(struct snd_card *card,
 912                                     struct snd_ctl_file *control,
 913                                     unsigned int cmd,
 914                                     unsigned long arg)
 915{
 916        void __user *argp = (void __user *)arg;
 917
 918        switch (cmd) {
 919        case SNDRV_CTL_IOCTL_RAWMIDI_NEXT_DEVICE:
 920        {
 921                int device;
 922
 923                if (get_user(device, (int __user *)argp))
 924                        return -EFAULT;
 925                if (device >= SNDRV_RAWMIDI_DEVICES) /* next device is -1 */
 926                        device = SNDRV_RAWMIDI_DEVICES - 1;
 927                mutex_lock(&register_mutex);
 928                device = device < 0 ? 0 : device + 1;
 929                while (device < SNDRV_RAWMIDI_DEVICES) {
 930                        if (snd_rawmidi_search(card, device))
 931                                break;
 932                        device++;
 933                }
 934                if (device == SNDRV_RAWMIDI_DEVICES)
 935                        device = -1;
 936                mutex_unlock(&register_mutex);
 937                if (put_user(device, (int __user *)argp))
 938                        return -EFAULT;
 939                return 0;
 940        }
 941        case SNDRV_CTL_IOCTL_RAWMIDI_PREFER_SUBDEVICE:
 942        {
 943                int val;
 944
 945                if (get_user(val, (int __user *)argp))
 946                        return -EFAULT;
 947                control->preferred_subdevice[SND_CTL_SUBDEV_RAWMIDI] = val;
 948                return 0;
 949        }
 950        case SNDRV_CTL_IOCTL_RAWMIDI_INFO:
 951                return snd_rawmidi_info_select_user(card, argp);
 952        }
 953        return -ENOIOCTLCMD;
 954}
 955
 956/**
 957 * snd_rawmidi_receive - receive the input data from the device
 958 * @substream: the rawmidi substream
 959 * @buffer: the buffer pointer
 960 * @count: the data size to read
 961 *
 962 * Reads the data from the internal buffer.
 963 *
 964 * Return: The size of read data, or a negative error code on failure.
 965 */
 966int snd_rawmidi_receive(struct snd_rawmidi_substream *substream,
 967                        const unsigned char *buffer, int count)
 968{
 969        unsigned long flags;
 970        int result = 0, count1;
 971        struct snd_rawmidi_runtime *runtime = substream->runtime;
 972
 973        if (!substream->opened)
 974                return -EBADFD;
 975        if (runtime->buffer == NULL) {
 976                rmidi_dbg(substream->rmidi,
 977                          "snd_rawmidi_receive: input is not active!!!\n");
 978                return -EINVAL;
 979        }
 980        spin_lock_irqsave(&runtime->lock, flags);
 981        if (count == 1) {       /* special case, faster code */
 982                substream->bytes++;
 983                if (runtime->avail < runtime->buffer_size) {
 984                        runtime->buffer[runtime->hw_ptr++] = buffer[0];
 985                        runtime->hw_ptr %= runtime->buffer_size;
 986                        runtime->avail++;
 987                        result++;
 988                } else {
 989                        runtime->xruns++;
 990                }
 991        } else {
 992                substream->bytes += count;
 993                count1 = runtime->buffer_size - runtime->hw_ptr;
 994                if (count1 > count)
 995                        count1 = count;
 996                if (count1 > (int)(runtime->buffer_size - runtime->avail))
 997                        count1 = runtime->buffer_size - runtime->avail;
 998                memcpy(runtime->buffer + runtime->hw_ptr, buffer, count1);
 999                runtime->hw_ptr += count1;
1000                runtime->hw_ptr %= runtime->buffer_size;
1001                runtime->avail += count1;
1002                count -= count1;
1003                result += count1;
1004                if (count > 0) {
1005                        buffer += count1;
1006                        count1 = count;
1007                        if (count1 > (int)(runtime->buffer_size - runtime->avail)) {
1008                                count1 = runtime->buffer_size - runtime->avail;
1009                                runtime->xruns += count - count1;
1010                        }
1011                        if (count1 > 0) {
1012                                memcpy(runtime->buffer, buffer, count1);
1013                                runtime->hw_ptr = count1;
1014                                runtime->avail += count1;
1015                                result += count1;
1016                        }
1017                }
1018        }
1019        if (result > 0) {
1020                if (runtime->event)
1021                        schedule_work(&runtime->event_work);
1022                else if (snd_rawmidi_ready(substream))
1023                        wake_up(&runtime->sleep);
1024        }
1025        spin_unlock_irqrestore(&runtime->lock, flags);
1026        return result;
1027}
1028EXPORT_SYMBOL(snd_rawmidi_receive);
1029
1030static long snd_rawmidi_kernel_read1(struct snd_rawmidi_substream *substream,
1031                                     unsigned char __user *userbuf,
1032                                     unsigned char *kernelbuf, long count)
1033{
1034        unsigned long flags;
1035        long result = 0, count1;
1036        struct snd_rawmidi_runtime *runtime = substream->runtime;
1037        unsigned long appl_ptr;
1038        int err = 0;
1039
1040        spin_lock_irqsave(&runtime->lock, flags);
1041        snd_rawmidi_buffer_ref(runtime);
1042        while (count > 0 && runtime->avail) {
1043                count1 = runtime->buffer_size - runtime->appl_ptr;
1044                if (count1 > count)
1045                        count1 = count;
1046                if (count1 > (int)runtime->avail)
1047                        count1 = runtime->avail;
1048
1049                /* update runtime->appl_ptr before unlocking for userbuf */
1050                appl_ptr = runtime->appl_ptr;
1051                runtime->appl_ptr += count1;
1052                runtime->appl_ptr %= runtime->buffer_size;
1053                runtime->avail -= count1;
1054
1055                if (kernelbuf)
1056                        memcpy(kernelbuf + result, runtime->buffer + appl_ptr, count1);
1057                if (userbuf) {
1058                        spin_unlock_irqrestore(&runtime->lock, flags);
1059                        if (copy_to_user(userbuf + result,
1060                                         runtime->buffer + appl_ptr, count1))
1061                                err = -EFAULT;
1062                        spin_lock_irqsave(&runtime->lock, flags);
1063                        if (err)
1064                                goto out;
1065                }
1066                result += count1;
1067                count -= count1;
1068        }
1069 out:
1070        snd_rawmidi_buffer_unref(runtime);
1071        spin_unlock_irqrestore(&runtime->lock, flags);
1072        return result > 0 ? result : err;
1073}
1074
1075long snd_rawmidi_kernel_read(struct snd_rawmidi_substream *substream,
1076                             unsigned char *buf, long count)
1077{
1078        snd_rawmidi_input_trigger(substream, 1);
1079        return snd_rawmidi_kernel_read1(substream, NULL/*userbuf*/, buf, count);
1080}
1081EXPORT_SYMBOL(snd_rawmidi_kernel_read);
1082
1083static ssize_t snd_rawmidi_read(struct file *file, char __user *buf, size_t count,
1084                                loff_t *offset)
1085{
1086        long result;
1087        int count1;
1088        struct snd_rawmidi_file *rfile;
1089        struct snd_rawmidi_substream *substream;
1090        struct snd_rawmidi_runtime *runtime;
1091
1092        rfile = file->private_data;
1093        substream = rfile->input;
1094        if (substream == NULL)
1095                return -EIO;
1096        runtime = substream->runtime;
1097        snd_rawmidi_input_trigger(substream, 1);
1098        result = 0;
1099        while (count > 0) {
1100                spin_lock_irq(&runtime->lock);
1101                while (!snd_rawmidi_ready(substream)) {
1102                        wait_queue_entry_t wait;
1103
1104                        if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1105                                spin_unlock_irq(&runtime->lock);
1106                                return result > 0 ? result : -EAGAIN;
1107                        }
1108                        init_waitqueue_entry(&wait, current);
1109                        add_wait_queue(&runtime->sleep, &wait);
1110                        set_current_state(TASK_INTERRUPTIBLE);
1111                        spin_unlock_irq(&runtime->lock);
1112                        schedule();
1113                        remove_wait_queue(&runtime->sleep, &wait);
1114                        if (rfile->rmidi->card->shutdown)
1115                                return -ENODEV;
1116                        if (signal_pending(current))
1117                                return result > 0 ? result : -ERESTARTSYS;
1118                        if (!runtime->avail)
1119                                return result > 0 ? result : -EIO;
1120                        spin_lock_irq(&runtime->lock);
1121                }
1122                spin_unlock_irq(&runtime->lock);
1123                count1 = snd_rawmidi_kernel_read1(substream,
1124                                                  (unsigned char __user *)buf,
1125                                                  NULL/*kernelbuf*/,
1126                                                  count);
1127                if (count1 < 0)
1128                        return result > 0 ? result : count1;
1129                result += count1;
1130                buf += count1;
1131                count -= count1;
1132        }
1133        return result;
1134}
1135
1136/**
1137 * snd_rawmidi_transmit_empty - check whether the output buffer is empty
1138 * @substream: the rawmidi substream
1139 *
1140 * Return: 1 if the internal output buffer is empty, 0 if not.
1141 */
1142int snd_rawmidi_transmit_empty(struct snd_rawmidi_substream *substream)
1143{
1144        struct snd_rawmidi_runtime *runtime = substream->runtime;
1145        int result;
1146        unsigned long flags;
1147
1148        if (runtime->buffer == NULL) {
1149                rmidi_dbg(substream->rmidi,
1150                          "snd_rawmidi_transmit_empty: output is not active!!!\n");
1151                return 1;
1152        }
1153        spin_lock_irqsave(&runtime->lock, flags);
1154        result = runtime->avail >= runtime->buffer_size;
1155        spin_unlock_irqrestore(&runtime->lock, flags);
1156        return result;
1157}
1158EXPORT_SYMBOL(snd_rawmidi_transmit_empty);
1159
1160/**
1161 * __snd_rawmidi_transmit_peek - copy data from the internal buffer
1162 * @substream: the rawmidi substream
1163 * @buffer: the buffer pointer
1164 * @count: data size to transfer
1165 *
1166 * This is a variant of snd_rawmidi_transmit_peek() without spinlock.
1167 */
1168int __snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
1169                              unsigned char *buffer, int count)
1170{
1171        int result, count1;
1172        struct snd_rawmidi_runtime *runtime = substream->runtime;
1173
1174        if (runtime->buffer == NULL) {
1175                rmidi_dbg(substream->rmidi,
1176                          "snd_rawmidi_transmit_peek: output is not active!!!\n");
1177                return -EINVAL;
1178        }
1179        result = 0;
1180        if (runtime->avail >= runtime->buffer_size) {
1181                /* warning: lowlevel layer MUST trigger down the hardware */
1182                goto __skip;
1183        }
1184        if (count == 1) {       /* special case, faster code */
1185                *buffer = runtime->buffer[runtime->hw_ptr];
1186                result++;
1187        } else {
1188                count1 = runtime->buffer_size - runtime->hw_ptr;
1189                if (count1 > count)
1190                        count1 = count;
1191                if (count1 > (int)(runtime->buffer_size - runtime->avail))
1192                        count1 = runtime->buffer_size - runtime->avail;
1193                memcpy(buffer, runtime->buffer + runtime->hw_ptr, count1);
1194                count -= count1;
1195                result += count1;
1196                if (count > 0) {
1197                        if (count > (int)(runtime->buffer_size - runtime->avail - count1))
1198                                count = runtime->buffer_size - runtime->avail - count1;
1199                        memcpy(buffer + count1, runtime->buffer, count);
1200                        result += count;
1201                }
1202        }
1203      __skip:
1204        return result;
1205}
1206EXPORT_SYMBOL(__snd_rawmidi_transmit_peek);
1207
1208/**
1209 * snd_rawmidi_transmit_peek - copy data from the internal buffer
1210 * @substream: the rawmidi substream
1211 * @buffer: the buffer pointer
1212 * @count: data size to transfer
1213 *
1214 * Copies data from the internal output buffer to the given buffer.
1215 *
1216 * Call this in the interrupt handler when the midi output is ready,
1217 * and call snd_rawmidi_transmit_ack() after the transmission is
1218 * finished.
1219 *
1220 * Return: The size of copied data, or a negative error code on failure.
1221 */
1222int snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
1223                              unsigned char *buffer, int count)
1224{
1225        struct snd_rawmidi_runtime *runtime = substream->runtime;
1226        int result;
1227        unsigned long flags;
1228
1229        spin_lock_irqsave(&runtime->lock, flags);
1230        result = __snd_rawmidi_transmit_peek(substream, buffer, count);
1231        spin_unlock_irqrestore(&runtime->lock, flags);
1232        return result;
1233}
1234EXPORT_SYMBOL(snd_rawmidi_transmit_peek);
1235
1236/**
1237 * __snd_rawmidi_transmit_ack - acknowledge the transmission
1238 * @substream: the rawmidi substream
1239 * @count: the transferred count
1240 *
1241 * This is a variant of __snd_rawmidi_transmit_ack() without spinlock.
1242 */
1243int __snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count)
1244{
1245        struct snd_rawmidi_runtime *runtime = substream->runtime;
1246
1247        if (runtime->buffer == NULL) {
1248                rmidi_dbg(substream->rmidi,
1249                          "snd_rawmidi_transmit_ack: output is not active!!!\n");
1250                return -EINVAL;
1251        }
1252        snd_BUG_ON(runtime->avail + count > runtime->buffer_size);
1253        runtime->hw_ptr += count;
1254        runtime->hw_ptr %= runtime->buffer_size;
1255        runtime->avail += count;
1256        substream->bytes += count;
1257        if (count > 0) {
1258                if (runtime->drain || snd_rawmidi_ready(substream))
1259                        wake_up(&runtime->sleep);
1260        }
1261        return count;
1262}
1263EXPORT_SYMBOL(__snd_rawmidi_transmit_ack);
1264
1265/**
1266 * snd_rawmidi_transmit_ack - acknowledge the transmission
1267 * @substream: the rawmidi substream
1268 * @count: the transferred count
1269 *
1270 * Advances the hardware pointer for the internal output buffer with
1271 * the given size and updates the condition.
1272 * Call after the transmission is finished.
1273 *
1274 * Return: The advanced size if successful, or a negative error code on failure.
1275 */
1276int snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count)
1277{
1278        struct snd_rawmidi_runtime *runtime = substream->runtime;
1279        int result;
1280        unsigned long flags;
1281
1282        spin_lock_irqsave(&runtime->lock, flags);
1283        result = __snd_rawmidi_transmit_ack(substream, count);
1284        spin_unlock_irqrestore(&runtime->lock, flags);
1285        return result;
1286}
1287EXPORT_SYMBOL(snd_rawmidi_transmit_ack);
1288
1289/**
1290 * snd_rawmidi_transmit - copy from the buffer to the device
1291 * @substream: the rawmidi substream
1292 * @buffer: the buffer pointer
1293 * @count: the data size to transfer
1294 *
1295 * Copies data from the buffer to the device and advances the pointer.
1296 *
1297 * Return: The copied size if successful, or a negative error code on failure.
1298 */
1299int snd_rawmidi_transmit(struct snd_rawmidi_substream *substream,
1300                         unsigned char *buffer, int count)
1301{
1302        struct snd_rawmidi_runtime *runtime = substream->runtime;
1303        int result;
1304        unsigned long flags;
1305
1306        spin_lock_irqsave(&runtime->lock, flags);
1307        if (!substream->opened)
1308                result = -EBADFD;
1309        else {
1310                count = __snd_rawmidi_transmit_peek(substream, buffer, count);
1311                if (count <= 0)
1312                        result = count;
1313                else
1314                        result = __snd_rawmidi_transmit_ack(substream, count);
1315        }
1316        spin_unlock_irqrestore(&runtime->lock, flags);
1317        return result;
1318}
1319EXPORT_SYMBOL(snd_rawmidi_transmit);
1320
1321/**
1322 * snd_rawmidi_proceed - Discard the all pending bytes and proceed
1323 * @substream: rawmidi substream
1324 *
1325 * Return: the number of discarded bytes
1326 */
1327int snd_rawmidi_proceed(struct snd_rawmidi_substream *substream)
1328{
1329        struct snd_rawmidi_runtime *runtime = substream->runtime;
1330        unsigned long flags;
1331        int count = 0;
1332
1333        spin_lock_irqsave(&runtime->lock, flags);
1334        if (runtime->avail < runtime->buffer_size) {
1335                count = runtime->buffer_size - runtime->avail;
1336                __snd_rawmidi_transmit_ack(substream, count);
1337        }
1338        spin_unlock_irqrestore(&runtime->lock, flags);
1339        return count;
1340}
1341EXPORT_SYMBOL(snd_rawmidi_proceed);
1342
1343static long snd_rawmidi_kernel_write1(struct snd_rawmidi_substream *substream,
1344                                      const unsigned char __user *userbuf,
1345                                      const unsigned char *kernelbuf,
1346                                      long count)
1347{
1348        unsigned long flags;
1349        long count1, result;
1350        struct snd_rawmidi_runtime *runtime = substream->runtime;
1351        unsigned long appl_ptr;
1352
1353        if (!kernelbuf && !userbuf)
1354                return -EINVAL;
1355        if (snd_BUG_ON(!runtime->buffer))
1356                return -EINVAL;
1357
1358        result = 0;
1359        spin_lock_irqsave(&runtime->lock, flags);
1360        if (substream->append) {
1361                if ((long)runtime->avail < count) {
1362                        spin_unlock_irqrestore(&runtime->lock, flags);
1363                        return -EAGAIN;
1364                }
1365        }
1366        snd_rawmidi_buffer_ref(runtime);
1367        while (count > 0 && runtime->avail > 0) {
1368                count1 = runtime->buffer_size - runtime->appl_ptr;
1369                if (count1 > count)
1370                        count1 = count;
1371                if (count1 > (long)runtime->avail)
1372                        count1 = runtime->avail;
1373
1374                /* update runtime->appl_ptr before unlocking for userbuf */
1375                appl_ptr = runtime->appl_ptr;
1376                runtime->appl_ptr += count1;
1377                runtime->appl_ptr %= runtime->buffer_size;
1378                runtime->avail -= count1;
1379
1380                if (kernelbuf)
1381                        memcpy(runtime->buffer + appl_ptr,
1382                               kernelbuf + result, count1);
1383                else if (userbuf) {
1384                        spin_unlock_irqrestore(&runtime->lock, flags);
1385                        if (copy_from_user(runtime->buffer + appl_ptr,
1386                                           userbuf + result, count1)) {
1387                                spin_lock_irqsave(&runtime->lock, flags);
1388                                result = result > 0 ? result : -EFAULT;
1389                                goto __end;
1390                        }
1391                        spin_lock_irqsave(&runtime->lock, flags);
1392                }
1393                result += count1;
1394                count -= count1;
1395        }
1396      __end:
1397        count1 = runtime->avail < runtime->buffer_size;
1398        snd_rawmidi_buffer_unref(runtime);
1399        spin_unlock_irqrestore(&runtime->lock, flags);
1400        if (count1)
1401                snd_rawmidi_output_trigger(substream, 1);
1402        return result;
1403}
1404
1405long snd_rawmidi_kernel_write(struct snd_rawmidi_substream *substream,
1406                              const unsigned char *buf, long count)
1407{
1408        return snd_rawmidi_kernel_write1(substream, NULL, buf, count);
1409}
1410EXPORT_SYMBOL(snd_rawmidi_kernel_write);
1411
1412static ssize_t snd_rawmidi_write(struct file *file, const char __user *buf,
1413                                 size_t count, loff_t *offset)
1414{
1415        long result, timeout;
1416        int count1;
1417        struct snd_rawmidi_file *rfile;
1418        struct snd_rawmidi_runtime *runtime;
1419        struct snd_rawmidi_substream *substream;
1420
1421        rfile = file->private_data;
1422        substream = rfile->output;
1423        runtime = substream->runtime;
1424        /* we cannot put an atomic message to our buffer */
1425        if (substream->append && count > runtime->buffer_size)
1426                return -EIO;
1427        result = 0;
1428        while (count > 0) {
1429                spin_lock_irq(&runtime->lock);
1430                while (!snd_rawmidi_ready_append(substream, count)) {
1431                        wait_queue_entry_t wait;
1432
1433                        if (file->f_flags & O_NONBLOCK) {
1434                                spin_unlock_irq(&runtime->lock);
1435                                return result > 0 ? result : -EAGAIN;
1436                        }
1437                        init_waitqueue_entry(&wait, current);
1438                        add_wait_queue(&runtime->sleep, &wait);
1439                        set_current_state(TASK_INTERRUPTIBLE);
1440                        spin_unlock_irq(&runtime->lock);
1441                        timeout = schedule_timeout(30 * HZ);
1442                        remove_wait_queue(&runtime->sleep, &wait);
1443                        if (rfile->rmidi->card->shutdown)
1444                                return -ENODEV;
1445                        if (signal_pending(current))
1446                                return result > 0 ? result : -ERESTARTSYS;
1447                        if (!runtime->avail && !timeout)
1448                                return result > 0 ? result : -EIO;
1449                        spin_lock_irq(&runtime->lock);
1450                }
1451                spin_unlock_irq(&runtime->lock);
1452                count1 = snd_rawmidi_kernel_write1(substream, buf, NULL, count);
1453                if (count1 < 0)
1454                        return result > 0 ? result : count1;
1455                result += count1;
1456                buf += count1;
1457                if ((size_t)count1 < count && (file->f_flags & O_NONBLOCK))
1458                        break;
1459                count -= count1;
1460        }
1461        if (file->f_flags & O_DSYNC) {
1462                spin_lock_irq(&runtime->lock);
1463                while (runtime->avail != runtime->buffer_size) {
1464                        wait_queue_entry_t wait;
1465                        unsigned int last_avail = runtime->avail;
1466
1467                        init_waitqueue_entry(&wait, current);
1468                        add_wait_queue(&runtime->sleep, &wait);
1469                        set_current_state(TASK_INTERRUPTIBLE);
1470                        spin_unlock_irq(&runtime->lock);
1471                        timeout = schedule_timeout(30 * HZ);
1472                        remove_wait_queue(&runtime->sleep, &wait);
1473                        if (signal_pending(current))
1474                                return result > 0 ? result : -ERESTARTSYS;
1475                        if (runtime->avail == last_avail && !timeout)
1476                                return result > 0 ? result : -EIO;
1477                        spin_lock_irq(&runtime->lock);
1478                }
1479                spin_unlock_irq(&runtime->lock);
1480        }
1481        return result;
1482}
1483
1484static __poll_t snd_rawmidi_poll(struct file *file, poll_table *wait)
1485{
1486        struct snd_rawmidi_file *rfile;
1487        struct snd_rawmidi_runtime *runtime;
1488        __poll_t mask;
1489
1490        rfile = file->private_data;
1491        if (rfile->input != NULL) {
1492                runtime = rfile->input->runtime;
1493                snd_rawmidi_input_trigger(rfile->input, 1);
1494                poll_wait(file, &runtime->sleep, wait);
1495        }
1496        if (rfile->output != NULL) {
1497                runtime = rfile->output->runtime;
1498                poll_wait(file, &runtime->sleep, wait);
1499        }
1500        mask = 0;
1501        if (rfile->input != NULL) {
1502                if (snd_rawmidi_ready(rfile->input))
1503                        mask |= EPOLLIN | EPOLLRDNORM;
1504        }
1505        if (rfile->output != NULL) {
1506                if (snd_rawmidi_ready(rfile->output))
1507                        mask |= EPOLLOUT | EPOLLWRNORM;
1508        }
1509        return mask;
1510}
1511
1512/*
1513 */
1514#ifdef CONFIG_COMPAT
1515#include "rawmidi_compat.c"
1516#else
1517#define snd_rawmidi_ioctl_compat        NULL
1518#endif
1519
1520/*
1521 */
1522
1523static void snd_rawmidi_proc_info_read(struct snd_info_entry *entry,
1524                                       struct snd_info_buffer *buffer)
1525{
1526        struct snd_rawmidi *rmidi;
1527        struct snd_rawmidi_substream *substream;
1528        struct snd_rawmidi_runtime *runtime;
1529
1530        rmidi = entry->private_data;
1531        snd_iprintf(buffer, "%s\n\n", rmidi->name);
1532        mutex_lock(&rmidi->open_mutex);
1533        if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_OUTPUT) {
1534                list_for_each_entry(substream,
1535                                    &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams,
1536                                    list) {
1537                        snd_iprintf(buffer,
1538                                    "Output %d\n"
1539                                    "  Tx bytes     : %lu\n",
1540                                    substream->number,
1541                                    (unsigned long) substream->bytes);
1542                        if (substream->opened) {
1543                                snd_iprintf(buffer,
1544                                    "  Owner PID    : %d\n",
1545                                    pid_vnr(substream->pid));
1546                                runtime = substream->runtime;
1547                                snd_iprintf(buffer,
1548                                    "  Mode         : %s\n"
1549                                    "  Buffer size  : %lu\n"
1550                                    "  Avail        : %lu\n",
1551                                    runtime->oss ? "OSS compatible" : "native",
1552                                    (unsigned long) runtime->buffer_size,
1553                                    (unsigned long) runtime->avail);
1554                        }
1555                }
1556        }
1557        if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_INPUT) {
1558                list_for_each_entry(substream,
1559                                    &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams,
1560                                    list) {
1561                        snd_iprintf(buffer,
1562                                    "Input %d\n"
1563                                    "  Rx bytes     : %lu\n",
1564                                    substream->number,
1565                                    (unsigned long) substream->bytes);
1566                        if (substream->opened) {
1567                                snd_iprintf(buffer,
1568                                            "  Owner PID    : %d\n",
1569                                            pid_vnr(substream->pid));
1570                                runtime = substream->runtime;
1571                                snd_iprintf(buffer,
1572                                            "  Buffer size  : %lu\n"
1573                                            "  Avail        : %lu\n"
1574                                            "  Overruns     : %lu\n",
1575                                            (unsigned long) runtime->buffer_size,
1576                                            (unsigned long) runtime->avail,
1577                                            (unsigned long) runtime->xruns);
1578                        }
1579                }
1580        }
1581        mutex_unlock(&rmidi->open_mutex);
1582}
1583
1584/*
1585 *  Register functions
1586 */
1587
1588static const struct file_operations snd_rawmidi_f_ops = {
1589        .owner =        THIS_MODULE,
1590        .read =         snd_rawmidi_read,
1591        .write =        snd_rawmidi_write,
1592        .open =         snd_rawmidi_open,
1593        .release =      snd_rawmidi_release,
1594        .llseek =       no_llseek,
1595        .poll =         snd_rawmidi_poll,
1596        .unlocked_ioctl =       snd_rawmidi_ioctl,
1597        .compat_ioctl = snd_rawmidi_ioctl_compat,
1598};
1599
1600static int snd_rawmidi_alloc_substreams(struct snd_rawmidi *rmidi,
1601                                        struct snd_rawmidi_str *stream,
1602                                        int direction,
1603                                        int count)
1604{
1605        struct snd_rawmidi_substream *substream;
1606        int idx;
1607
1608        for (idx = 0; idx < count; idx++) {
1609                substream = kzalloc(sizeof(*substream), GFP_KERNEL);
1610                if (!substream)
1611                        return -ENOMEM;
1612                substream->stream = direction;
1613                substream->number = idx;
1614                substream->rmidi = rmidi;
1615                substream->pstr = stream;
1616                list_add_tail(&substream->list, &stream->substreams);
1617                stream->substream_count++;
1618        }
1619        return 0;
1620}
1621
1622static void release_rawmidi_device(struct device *dev)
1623{
1624        kfree(container_of(dev, struct snd_rawmidi, dev));
1625}
1626
1627/**
1628 * snd_rawmidi_new - create a rawmidi instance
1629 * @card: the card instance
1630 * @id: the id string
1631 * @device: the device index
1632 * @output_count: the number of output streams
1633 * @input_count: the number of input streams
1634 * @rrawmidi: the pointer to store the new rawmidi instance
1635 *
1636 * Creates a new rawmidi instance.
1637 * Use snd_rawmidi_set_ops() to set the operators to the new instance.
1638 *
1639 * Return: Zero if successful, or a negative error code on failure.
1640 */
1641int snd_rawmidi_new(struct snd_card *card, char *id, int device,
1642                    int output_count, int input_count,
1643                    struct snd_rawmidi **rrawmidi)
1644{
1645        struct snd_rawmidi *rmidi;
1646        int err;
1647        static const struct snd_device_ops ops = {
1648                .dev_free = snd_rawmidi_dev_free,
1649                .dev_register = snd_rawmidi_dev_register,
1650                .dev_disconnect = snd_rawmidi_dev_disconnect,
1651        };
1652
1653        if (snd_BUG_ON(!card))
1654                return -ENXIO;
1655        if (rrawmidi)
1656                *rrawmidi = NULL;
1657        rmidi = kzalloc(sizeof(*rmidi), GFP_KERNEL);
1658        if (!rmidi)
1659                return -ENOMEM;
1660        rmidi->card = card;
1661        rmidi->device = device;
1662        mutex_init(&rmidi->open_mutex);
1663        init_waitqueue_head(&rmidi->open_wait);
1664        INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams);
1665        INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams);
1666
1667        if (id != NULL)
1668                strlcpy(rmidi->id, id, sizeof(rmidi->id));
1669
1670        snd_device_initialize(&rmidi->dev, card);
1671        rmidi->dev.release = release_rawmidi_device;
1672        dev_set_name(&rmidi->dev, "midiC%iD%i", card->number, device);
1673
1674        err = snd_rawmidi_alloc_substreams(rmidi,
1675                                           &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT],
1676                                           SNDRV_RAWMIDI_STREAM_INPUT,
1677                                           input_count);
1678        if (err < 0)
1679                goto error;
1680        err = snd_rawmidi_alloc_substreams(rmidi,
1681                                           &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT],
1682                                           SNDRV_RAWMIDI_STREAM_OUTPUT,
1683                                           output_count);
1684        if (err < 0)
1685                goto error;
1686        err = snd_device_new(card, SNDRV_DEV_RAWMIDI, rmidi, &ops);
1687        if (err < 0)
1688                goto error;
1689
1690        if (rrawmidi)
1691                *rrawmidi = rmidi;
1692        return 0;
1693
1694 error:
1695        snd_rawmidi_free(rmidi);
1696        return err;
1697}
1698EXPORT_SYMBOL(snd_rawmidi_new);
1699
1700static void snd_rawmidi_free_substreams(struct snd_rawmidi_str *stream)
1701{
1702        struct snd_rawmidi_substream *substream;
1703
1704        while (!list_empty(&stream->substreams)) {
1705                substream = list_entry(stream->substreams.next, struct snd_rawmidi_substream, list);
1706                list_del(&substream->list);
1707                kfree(substream);
1708        }
1709}
1710
1711static int snd_rawmidi_free(struct snd_rawmidi *rmidi)
1712{
1713        if (!rmidi)
1714                return 0;
1715
1716        snd_info_free_entry(rmidi->proc_entry);
1717        rmidi->proc_entry = NULL;
1718        mutex_lock(&register_mutex);
1719        if (rmidi->ops && rmidi->ops->dev_unregister)
1720                rmidi->ops->dev_unregister(rmidi);
1721        mutex_unlock(&register_mutex);
1722
1723        snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT]);
1724        snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT]);
1725        if (rmidi->private_free)
1726                rmidi->private_free(rmidi);
1727        put_device(&rmidi->dev);
1728        return 0;
1729}
1730
1731static int snd_rawmidi_dev_free(struct snd_device *device)
1732{
1733        struct snd_rawmidi *rmidi = device->device_data;
1734
1735        return snd_rawmidi_free(rmidi);
1736}
1737
1738#if IS_ENABLED(CONFIG_SND_SEQUENCER)
1739static void snd_rawmidi_dev_seq_free(struct snd_seq_device *device)
1740{
1741        struct snd_rawmidi *rmidi = device->private_data;
1742
1743        rmidi->seq_dev = NULL;
1744}
1745#endif
1746
1747static int snd_rawmidi_dev_register(struct snd_device *device)
1748{
1749        int err;
1750        struct snd_info_entry *entry;
1751        char name[16];
1752        struct snd_rawmidi *rmidi = device->device_data;
1753
1754        if (rmidi->device >= SNDRV_RAWMIDI_DEVICES)
1755                return -ENOMEM;
1756        err = 0;
1757        mutex_lock(&register_mutex);
1758        if (snd_rawmidi_search(rmidi->card, rmidi->device))
1759                err = -EBUSY;
1760        else
1761                list_add_tail(&rmidi->list, &snd_rawmidi_devices);
1762        mutex_unlock(&register_mutex);
1763        if (err < 0)
1764                return err;
1765
1766        err = snd_register_device(SNDRV_DEVICE_TYPE_RAWMIDI,
1767                                  rmidi->card, rmidi->device,
1768                                  &snd_rawmidi_f_ops, rmidi, &rmidi->dev);
1769        if (err < 0) {
1770                rmidi_err(rmidi, "unable to register\n");
1771                goto error;
1772        }
1773        if (rmidi->ops && rmidi->ops->dev_register) {
1774                err = rmidi->ops->dev_register(rmidi);
1775                if (err < 0)
1776                        goto error_unregister;
1777        }
1778#ifdef CONFIG_SND_OSSEMUL
1779        rmidi->ossreg = 0;
1780        if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1781                if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1782                                            rmidi->card, 0, &snd_rawmidi_f_ops,
1783                                            rmidi) < 0) {
1784                        rmidi_err(rmidi,
1785                                  "unable to register OSS rawmidi device %i:%i\n",
1786                                  rmidi->card->number, 0);
1787                } else {
1788                        rmidi->ossreg++;
1789#ifdef SNDRV_OSS_INFO_DEV_MIDI
1790                        snd_oss_info_register(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number, rmidi->name);
1791#endif
1792                }
1793        }
1794        if ((int)rmidi->device == amidi_map[rmidi->card->number]) {
1795                if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1796                                            rmidi->card, 1, &snd_rawmidi_f_ops,
1797                                            rmidi) < 0) {
1798                        rmidi_err(rmidi,
1799                                  "unable to register OSS rawmidi device %i:%i\n",
1800                                  rmidi->card->number, 1);
1801                } else {
1802                        rmidi->ossreg++;
1803                }
1804        }
1805#endif /* CONFIG_SND_OSSEMUL */
1806        sprintf(name, "midi%d", rmidi->device);
1807        entry = snd_info_create_card_entry(rmidi->card, name, rmidi->card->proc_root);
1808        if (entry) {
1809                entry->private_data = rmidi;
1810                entry->c.text.read = snd_rawmidi_proc_info_read;
1811                if (snd_info_register(entry) < 0) {
1812                        snd_info_free_entry(entry);
1813                        entry = NULL;
1814                }
1815        }
1816        rmidi->proc_entry = entry;
1817#if IS_ENABLED(CONFIG_SND_SEQUENCER)
1818        if (!rmidi->ops || !rmidi->ops->dev_register) { /* own registration mechanism */
1819                if (snd_seq_device_new(rmidi->card, rmidi->device, SNDRV_SEQ_DEV_ID_MIDISYNTH, 0, &rmidi->seq_dev) >= 0) {
1820                        rmidi->seq_dev->private_data = rmidi;
1821                        rmidi->seq_dev->private_free = snd_rawmidi_dev_seq_free;
1822                        sprintf(rmidi->seq_dev->name, "MIDI %d-%d", rmidi->card->number, rmidi->device);
1823                        snd_device_register(rmidi->card, rmidi->seq_dev);
1824                }
1825        }
1826#endif
1827        return 0;
1828
1829 error_unregister:
1830        snd_unregister_device(&rmidi->dev);
1831 error:
1832        mutex_lock(&register_mutex);
1833        list_del(&rmidi->list);
1834        mutex_unlock(&register_mutex);
1835        return err;
1836}
1837
1838static int snd_rawmidi_dev_disconnect(struct snd_device *device)
1839{
1840        struct snd_rawmidi *rmidi = device->device_data;
1841        int dir;
1842
1843        mutex_lock(&register_mutex);
1844        mutex_lock(&rmidi->open_mutex);
1845        wake_up(&rmidi->open_wait);
1846        list_del_init(&rmidi->list);
1847        for (dir = 0; dir < 2; dir++) {
1848                struct snd_rawmidi_substream *s;
1849
1850                list_for_each_entry(s, &rmidi->streams[dir].substreams, list) {
1851                        if (s->runtime)
1852                                wake_up(&s->runtime->sleep);
1853                }
1854        }
1855
1856#ifdef CONFIG_SND_OSSEMUL
1857        if (rmidi->ossreg) {
1858                if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1859                        snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 0);
1860#ifdef SNDRV_OSS_INFO_DEV_MIDI
1861                        snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number);
1862#endif
1863                }
1864                if ((int)rmidi->device == amidi_map[rmidi->card->number])
1865                        snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 1);
1866                rmidi->ossreg = 0;
1867        }
1868#endif /* CONFIG_SND_OSSEMUL */
1869        snd_unregister_device(&rmidi->dev);
1870        mutex_unlock(&rmidi->open_mutex);
1871        mutex_unlock(&register_mutex);
1872        return 0;
1873}
1874
1875/**
1876 * snd_rawmidi_set_ops - set the rawmidi operators
1877 * @rmidi: the rawmidi instance
1878 * @stream: the stream direction, SNDRV_RAWMIDI_STREAM_XXX
1879 * @ops: the operator table
1880 *
1881 * Sets the rawmidi operators for the given stream direction.
1882 */
1883void snd_rawmidi_set_ops(struct snd_rawmidi *rmidi, int stream,
1884                         const struct snd_rawmidi_ops *ops)
1885{
1886        struct snd_rawmidi_substream *substream;
1887
1888        list_for_each_entry(substream, &rmidi->streams[stream].substreams, list)
1889                substream->ops = ops;
1890}
1891EXPORT_SYMBOL(snd_rawmidi_set_ops);
1892
1893/*
1894 *  ENTRY functions
1895 */
1896
1897static int __init alsa_rawmidi_init(void)
1898{
1899
1900        snd_ctl_register_ioctl(snd_rawmidi_control_ioctl);
1901        snd_ctl_register_ioctl_compat(snd_rawmidi_control_ioctl);
1902#ifdef CONFIG_SND_OSSEMUL
1903        { int i;
1904        /* check device map table */
1905        for (i = 0; i < SNDRV_CARDS; i++) {
1906                if (midi_map[i] < 0 || midi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1907                        pr_err("ALSA: rawmidi: invalid midi_map[%d] = %d\n",
1908                               i, midi_map[i]);
1909                        midi_map[i] = 0;
1910                }
1911                if (amidi_map[i] < 0 || amidi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1912                        pr_err("ALSA: rawmidi: invalid amidi_map[%d] = %d\n",
1913                               i, amidi_map[i]);
1914                        amidi_map[i] = 1;
1915                }
1916        }
1917        }
1918#endif /* CONFIG_SND_OSSEMUL */
1919        return 0;
1920}
1921
1922static void __exit alsa_rawmidi_exit(void)
1923{
1924        snd_ctl_unregister_ioctl(snd_rawmidi_control_ioctl);
1925        snd_ctl_unregister_ioctl_compat(snd_rawmidi_control_ioctl);
1926}
1927
1928module_init(alsa_rawmidi_init)
1929module_exit(alsa_rawmidi_exit)
1930