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 bool __snd_rawmidi_ready(struct snd_rawmidi_runtime *runtime)
  99{
 100        return runtime->avail >= runtime->avail_min;
 101}
 102
 103static bool snd_rawmidi_ready(struct snd_rawmidi_substream *substream)
 104{
 105        struct snd_rawmidi_runtime *runtime = substream->runtime;
 106        unsigned long flags;
 107        bool ready;
 108
 109        spin_lock_irqsave(&runtime->lock, flags);
 110        ready = __snd_rawmidi_ready(runtime);
 111        spin_unlock_irqrestore(&runtime->lock, flags);
 112        return ready;
 113}
 114
 115static inline int snd_rawmidi_ready_append(struct snd_rawmidi_substream *substream,
 116                                           size_t count)
 117{
 118        struct snd_rawmidi_runtime *runtime = substream->runtime;
 119
 120        return runtime->avail >= runtime->avail_min &&
 121               (!substream->append || runtime->avail >= count);
 122}
 123
 124static void snd_rawmidi_input_event_work(struct work_struct *work)
 125{
 126        struct snd_rawmidi_runtime *runtime =
 127                container_of(work, struct snd_rawmidi_runtime, event_work);
 128
 129        if (runtime->event)
 130                runtime->event(runtime->substream);
 131}
 132
 133/* buffer refcount management: call with runtime->lock held */
 134static inline void snd_rawmidi_buffer_ref(struct snd_rawmidi_runtime *runtime)
 135{
 136        runtime->buffer_ref++;
 137}
 138
 139static inline void snd_rawmidi_buffer_unref(struct snd_rawmidi_runtime *runtime)
 140{
 141        runtime->buffer_ref--;
 142}
 143
 144static int snd_rawmidi_runtime_create(struct snd_rawmidi_substream *substream)
 145{
 146        struct snd_rawmidi_runtime *runtime;
 147
 148        runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
 149        if (!runtime)
 150                return -ENOMEM;
 151        runtime->substream = substream;
 152        spin_lock_init(&runtime->lock);
 153        init_waitqueue_head(&runtime->sleep);
 154        INIT_WORK(&runtime->event_work, snd_rawmidi_input_event_work);
 155        runtime->event = NULL;
 156        runtime->buffer_size = PAGE_SIZE;
 157        runtime->avail_min = 1;
 158        if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
 159                runtime->avail = 0;
 160        else
 161                runtime->avail = runtime->buffer_size;
 162        runtime->buffer = kvzalloc(runtime->buffer_size, GFP_KERNEL);
 163        if (!runtime->buffer) {
 164                kfree(runtime);
 165                return -ENOMEM;
 166        }
 167        runtime->appl_ptr = runtime->hw_ptr = 0;
 168        substream->runtime = runtime;
 169        return 0;
 170}
 171
 172static int snd_rawmidi_runtime_free(struct snd_rawmidi_substream *substream)
 173{
 174        struct snd_rawmidi_runtime *runtime = substream->runtime;
 175
 176        kvfree(runtime->buffer);
 177        kfree(runtime);
 178        substream->runtime = NULL;
 179        return 0;
 180}
 181
 182static inline void snd_rawmidi_output_trigger(struct snd_rawmidi_substream *substream, int up)
 183{
 184        if (!substream->opened)
 185                return;
 186        substream->ops->trigger(substream, up);
 187}
 188
 189static void snd_rawmidi_input_trigger(struct snd_rawmidi_substream *substream, int up)
 190{
 191        if (!substream->opened)
 192                return;
 193        substream->ops->trigger(substream, up);
 194        if (!up)
 195                cancel_work_sync(&substream->runtime->event_work);
 196}
 197
 198static void __reset_runtime_ptrs(struct snd_rawmidi_runtime *runtime,
 199                                 bool is_input)
 200{
 201        runtime->drain = 0;
 202        runtime->appl_ptr = runtime->hw_ptr = 0;
 203        runtime->avail = is_input ? 0 : runtime->buffer_size;
 204}
 205
 206static void reset_runtime_ptrs(struct snd_rawmidi_runtime *runtime,
 207                               bool is_input)
 208{
 209        unsigned long flags;
 210
 211        spin_lock_irqsave(&runtime->lock, flags);
 212        __reset_runtime_ptrs(runtime, is_input);
 213        spin_unlock_irqrestore(&runtime->lock, flags);
 214}
 215
 216int snd_rawmidi_drop_output(struct snd_rawmidi_substream *substream)
 217{
 218        snd_rawmidi_output_trigger(substream, 0);
 219        reset_runtime_ptrs(substream->runtime, false);
 220        return 0;
 221}
 222EXPORT_SYMBOL(snd_rawmidi_drop_output);
 223
 224int snd_rawmidi_drain_output(struct snd_rawmidi_substream *substream)
 225{
 226        int err;
 227        long timeout;
 228        struct snd_rawmidi_runtime *runtime = substream->runtime;
 229
 230        err = 0;
 231        runtime->drain = 1;
 232        timeout = wait_event_interruptible_timeout(runtime->sleep,
 233                                (runtime->avail >= runtime->buffer_size),
 234                                10*HZ);
 235        if (signal_pending(current))
 236                err = -ERESTARTSYS;
 237        if (runtime->avail < runtime->buffer_size && !timeout) {
 238                rmidi_warn(substream->rmidi,
 239                           "rawmidi drain error (avail = %li, buffer_size = %li)\n",
 240                           (long)runtime->avail, (long)runtime->buffer_size);
 241                err = -EIO;
 242        }
 243        runtime->drain = 0;
 244        if (err != -ERESTARTSYS) {
 245                /* we need wait a while to make sure that Tx FIFOs are empty */
 246                if (substream->ops->drain)
 247                        substream->ops->drain(substream);
 248                else
 249                        msleep(50);
 250                snd_rawmidi_drop_output(substream);
 251        }
 252        return err;
 253}
 254EXPORT_SYMBOL(snd_rawmidi_drain_output);
 255
 256int snd_rawmidi_drain_input(struct snd_rawmidi_substream *substream)
 257{
 258        snd_rawmidi_input_trigger(substream, 0);
 259        reset_runtime_ptrs(substream->runtime, true);
 260        return 0;
 261}
 262EXPORT_SYMBOL(snd_rawmidi_drain_input);
 263
 264/* look for an available substream for the given stream direction;
 265 * if a specific subdevice is given, try to assign it
 266 */
 267static int assign_substream(struct snd_rawmidi *rmidi, int subdevice,
 268                            int stream, int mode,
 269                            struct snd_rawmidi_substream **sub_ret)
 270{
 271        struct snd_rawmidi_substream *substream;
 272        struct snd_rawmidi_str *s = &rmidi->streams[stream];
 273        static const unsigned int info_flags[2] = {
 274                [SNDRV_RAWMIDI_STREAM_OUTPUT] = SNDRV_RAWMIDI_INFO_OUTPUT,
 275                [SNDRV_RAWMIDI_STREAM_INPUT] = SNDRV_RAWMIDI_INFO_INPUT,
 276        };
 277
 278        if (!(rmidi->info_flags & info_flags[stream]))
 279                return -ENXIO;
 280        if (subdevice >= 0 && subdevice >= s->substream_count)
 281                return -ENODEV;
 282
 283        list_for_each_entry(substream, &s->substreams, list) {
 284                if (substream->opened) {
 285                        if (stream == SNDRV_RAWMIDI_STREAM_INPUT ||
 286                            !(mode & SNDRV_RAWMIDI_LFLG_APPEND) ||
 287                            !substream->append)
 288                                continue;
 289                }
 290                if (subdevice < 0 || subdevice == substream->number) {
 291                        *sub_ret = substream;
 292                        return 0;
 293                }
 294        }
 295        return -EAGAIN;
 296}
 297
 298/* open and do ref-counting for the given substream */
 299static int open_substream(struct snd_rawmidi *rmidi,
 300                          struct snd_rawmidi_substream *substream,
 301                          int mode)
 302{
 303        int err;
 304
 305        if (substream->use_count == 0) {
 306                err = snd_rawmidi_runtime_create(substream);
 307                if (err < 0)
 308                        return err;
 309                err = substream->ops->open(substream);
 310                if (err < 0) {
 311                        snd_rawmidi_runtime_free(substream);
 312                        return err;
 313                }
 314                substream->opened = 1;
 315                substream->active_sensing = 0;
 316                if (mode & SNDRV_RAWMIDI_LFLG_APPEND)
 317                        substream->append = 1;
 318                substream->pid = get_pid(task_pid(current));
 319                rmidi->streams[substream->stream].substream_opened++;
 320        }
 321        substream->use_count++;
 322        return 0;
 323}
 324
 325static void close_substream(struct snd_rawmidi *rmidi,
 326                            struct snd_rawmidi_substream *substream,
 327                            int cleanup);
 328
 329static int rawmidi_open_priv(struct snd_rawmidi *rmidi, int subdevice, int mode,
 330                             struct snd_rawmidi_file *rfile)
 331{
 332        struct snd_rawmidi_substream *sinput = NULL, *soutput = NULL;
 333        int err;
 334
 335        rfile->input = rfile->output = NULL;
 336        if (mode & SNDRV_RAWMIDI_LFLG_INPUT) {
 337                err = assign_substream(rmidi, subdevice,
 338                                       SNDRV_RAWMIDI_STREAM_INPUT,
 339                                       mode, &sinput);
 340                if (err < 0)
 341                        return err;
 342        }
 343        if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) {
 344                err = assign_substream(rmidi, subdevice,
 345                                       SNDRV_RAWMIDI_STREAM_OUTPUT,
 346                                       mode, &soutput);
 347                if (err < 0)
 348                        return err;
 349        }
 350
 351        if (sinput) {
 352                err = open_substream(rmidi, sinput, mode);
 353                if (err < 0)
 354                        return err;
 355        }
 356        if (soutput) {
 357                err = open_substream(rmidi, soutput, mode);
 358                if (err < 0) {
 359                        if (sinput)
 360                                close_substream(rmidi, sinput, 0);
 361                        return err;
 362                }
 363        }
 364
 365        rfile->rmidi = rmidi;
 366        rfile->input = sinput;
 367        rfile->output = soutput;
 368        return 0;
 369}
 370
 371/* called from sound/core/seq/seq_midi.c */
 372int snd_rawmidi_kernel_open(struct snd_card *card, int device, int subdevice,
 373                            int mode, struct snd_rawmidi_file *rfile)
 374{
 375        struct snd_rawmidi *rmidi;
 376        int err = 0;
 377
 378        if (snd_BUG_ON(!rfile))
 379                return -EINVAL;
 380
 381        mutex_lock(&register_mutex);
 382        rmidi = snd_rawmidi_search(card, device);
 383        if (!rmidi)
 384                err = -ENODEV;
 385        else if (!try_module_get(rmidi->card->module))
 386                err = -ENXIO;
 387        mutex_unlock(&register_mutex);
 388        if (err < 0)
 389                return err;
 390
 391        mutex_lock(&rmidi->open_mutex);
 392        err = rawmidi_open_priv(rmidi, subdevice, mode, rfile);
 393        mutex_unlock(&rmidi->open_mutex);
 394        if (err < 0)
 395                module_put(rmidi->card->module);
 396        return err;
 397}
 398EXPORT_SYMBOL(snd_rawmidi_kernel_open);
 399
 400static int snd_rawmidi_open(struct inode *inode, struct file *file)
 401{
 402        int maj = imajor(inode);
 403        struct snd_card *card;
 404        int subdevice;
 405        unsigned short fflags;
 406        int err;
 407        struct snd_rawmidi *rmidi;
 408        struct snd_rawmidi_file *rawmidi_file = NULL;
 409        wait_queue_entry_t wait;
 410
 411        if ((file->f_flags & O_APPEND) && !(file->f_flags & O_NONBLOCK))
 412                return -EINVAL;         /* invalid combination */
 413
 414        err = stream_open(inode, file);
 415        if (err < 0)
 416                return err;
 417
 418        if (maj == snd_major) {
 419                rmidi = snd_lookup_minor_data(iminor(inode),
 420                                              SNDRV_DEVICE_TYPE_RAWMIDI);
 421#ifdef CONFIG_SND_OSSEMUL
 422        } else if (maj == SOUND_MAJOR) {
 423                rmidi = snd_lookup_oss_minor_data(iminor(inode),
 424                                                  SNDRV_OSS_DEVICE_TYPE_MIDI);
 425#endif
 426        } else
 427                return -ENXIO;
 428
 429        if (rmidi == NULL)
 430                return -ENODEV;
 431
 432        if (!try_module_get(rmidi->card->module)) {
 433                snd_card_unref(rmidi->card);
 434                return -ENXIO;
 435        }
 436
 437        mutex_lock(&rmidi->open_mutex);
 438        card = rmidi->card;
 439        err = snd_card_file_add(card, file);
 440        if (err < 0)
 441                goto __error_card;
 442        fflags = snd_rawmidi_file_flags(file);
 443        if ((file->f_flags & O_APPEND) || maj == SOUND_MAJOR) /* OSS emul? */
 444                fflags |= SNDRV_RAWMIDI_LFLG_APPEND;
 445        rawmidi_file = kmalloc(sizeof(*rawmidi_file), GFP_KERNEL);
 446        if (rawmidi_file == NULL) {
 447                err = -ENOMEM;
 448                goto __error;
 449        }
 450        init_waitqueue_entry(&wait, current);
 451        add_wait_queue(&rmidi->open_wait, &wait);
 452        while (1) {
 453                subdevice = snd_ctl_get_preferred_subdevice(card, SND_CTL_SUBDEV_RAWMIDI);
 454                err = rawmidi_open_priv(rmidi, subdevice, fflags, rawmidi_file);
 455                if (err >= 0)
 456                        break;
 457                if (err == -EAGAIN) {
 458                        if (file->f_flags & O_NONBLOCK) {
 459                                err = -EBUSY;
 460                                break;
 461                        }
 462                } else
 463                        break;
 464                set_current_state(TASK_INTERRUPTIBLE);
 465                mutex_unlock(&rmidi->open_mutex);
 466                schedule();
 467                mutex_lock(&rmidi->open_mutex);
 468                if (rmidi->card->shutdown) {
 469                        err = -ENODEV;
 470                        break;
 471                }
 472                if (signal_pending(current)) {
 473                        err = -ERESTARTSYS;
 474                        break;
 475                }
 476        }
 477        remove_wait_queue(&rmidi->open_wait, &wait);
 478        if (err < 0) {
 479                kfree(rawmidi_file);
 480                goto __error;
 481        }
 482#ifdef CONFIG_SND_OSSEMUL
 483        if (rawmidi_file->input && rawmidi_file->input->runtime)
 484                rawmidi_file->input->runtime->oss = (maj == SOUND_MAJOR);
 485        if (rawmidi_file->output && rawmidi_file->output->runtime)
 486                rawmidi_file->output->runtime->oss = (maj == SOUND_MAJOR);
 487#endif
 488        file->private_data = rawmidi_file;
 489        mutex_unlock(&rmidi->open_mutex);
 490        snd_card_unref(rmidi->card);
 491        return 0;
 492
 493 __error:
 494        snd_card_file_remove(card, file);
 495 __error_card:
 496        mutex_unlock(&rmidi->open_mutex);
 497        module_put(rmidi->card->module);
 498        snd_card_unref(rmidi->card);
 499        return err;
 500}
 501
 502static void close_substream(struct snd_rawmidi *rmidi,
 503                            struct snd_rawmidi_substream *substream,
 504                            int cleanup)
 505{
 506        if (--substream->use_count)
 507                return;
 508
 509        if (cleanup) {
 510                if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
 511                        snd_rawmidi_input_trigger(substream, 0);
 512                else {
 513                        if (substream->active_sensing) {
 514                                unsigned char buf = 0xfe;
 515                                /* sending single active sensing message
 516                                 * to shut the device up
 517                                 */
 518                                snd_rawmidi_kernel_write(substream, &buf, 1);
 519                        }
 520                        if (snd_rawmidi_drain_output(substream) == -ERESTARTSYS)
 521                                snd_rawmidi_output_trigger(substream, 0);
 522                }
 523        }
 524        substream->ops->close(substream);
 525        if (substream->runtime->private_free)
 526                substream->runtime->private_free(substream);
 527        snd_rawmidi_runtime_free(substream);
 528        substream->opened = 0;
 529        substream->append = 0;
 530        put_pid(substream->pid);
 531        substream->pid = NULL;
 532        rmidi->streams[substream->stream].substream_opened--;
 533}
 534
 535static void rawmidi_release_priv(struct snd_rawmidi_file *rfile)
 536{
 537        struct snd_rawmidi *rmidi;
 538
 539        rmidi = rfile->rmidi;
 540        mutex_lock(&rmidi->open_mutex);
 541        if (rfile->input) {
 542                close_substream(rmidi, rfile->input, 1);
 543                rfile->input = NULL;
 544        }
 545        if (rfile->output) {
 546                close_substream(rmidi, rfile->output, 1);
 547                rfile->output = NULL;
 548        }
 549        rfile->rmidi = NULL;
 550        mutex_unlock(&rmidi->open_mutex);
 551        wake_up(&rmidi->open_wait);
 552}
 553
 554/* called from sound/core/seq/seq_midi.c */
 555int snd_rawmidi_kernel_release(struct snd_rawmidi_file *rfile)
 556{
 557        struct snd_rawmidi *rmidi;
 558
 559        if (snd_BUG_ON(!rfile))
 560                return -ENXIO;
 561
 562        rmidi = rfile->rmidi;
 563        rawmidi_release_priv(rfile);
 564        module_put(rmidi->card->module);
 565        return 0;
 566}
 567EXPORT_SYMBOL(snd_rawmidi_kernel_release);
 568
 569static int snd_rawmidi_release(struct inode *inode, struct file *file)
 570{
 571        struct snd_rawmidi_file *rfile;
 572        struct snd_rawmidi *rmidi;
 573        struct module *module;
 574
 575        rfile = file->private_data;
 576        rmidi = rfile->rmidi;
 577        rawmidi_release_priv(rfile);
 578        kfree(rfile);
 579        module = rmidi->card->module;
 580        snd_card_file_remove(rmidi->card, file);
 581        module_put(module);
 582        return 0;
 583}
 584
 585static int snd_rawmidi_info(struct snd_rawmidi_substream *substream,
 586                            struct snd_rawmidi_info *info)
 587{
 588        struct snd_rawmidi *rmidi;
 589
 590        if (substream == NULL)
 591                return -ENODEV;
 592        rmidi = substream->rmidi;
 593        memset(info, 0, sizeof(*info));
 594        info->card = rmidi->card->number;
 595        info->device = rmidi->device;
 596        info->subdevice = substream->number;
 597        info->stream = substream->stream;
 598        info->flags = rmidi->info_flags;
 599        strcpy(info->id, rmidi->id);
 600        strcpy(info->name, rmidi->name);
 601        strcpy(info->subname, substream->name);
 602        info->subdevices_count = substream->pstr->substream_count;
 603        info->subdevices_avail = (substream->pstr->substream_count -
 604                                  substream->pstr->substream_opened);
 605        return 0;
 606}
 607
 608static int snd_rawmidi_info_user(struct snd_rawmidi_substream *substream,
 609                                 struct snd_rawmidi_info __user *_info)
 610{
 611        struct snd_rawmidi_info info;
 612        int err;
 613
 614        err = snd_rawmidi_info(substream, &info);
 615        if (err < 0)
 616                return err;
 617        if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
 618                return -EFAULT;
 619        return 0;
 620}
 621
 622static int __snd_rawmidi_info_select(struct snd_card *card,
 623                                     struct snd_rawmidi_info *info)
 624{
 625        struct snd_rawmidi *rmidi;
 626        struct snd_rawmidi_str *pstr;
 627        struct snd_rawmidi_substream *substream;
 628
 629        rmidi = snd_rawmidi_search(card, info->device);
 630        if (!rmidi)
 631                return -ENXIO;
 632        if (info->stream < 0 || info->stream > 1)
 633                return -EINVAL;
 634        info->stream = array_index_nospec(info->stream, 2);
 635        pstr = &rmidi->streams[info->stream];
 636        if (pstr->substream_count == 0)
 637                return -ENOENT;
 638        if (info->subdevice >= pstr->substream_count)
 639                return -ENXIO;
 640        list_for_each_entry(substream, &pstr->substreams, list) {
 641                if ((unsigned int)substream->number == info->subdevice)
 642                        return snd_rawmidi_info(substream, info);
 643        }
 644        return -ENXIO;
 645}
 646
 647int snd_rawmidi_info_select(struct snd_card *card, struct snd_rawmidi_info *info)
 648{
 649        int ret;
 650
 651        mutex_lock(&register_mutex);
 652        ret = __snd_rawmidi_info_select(card, info);
 653        mutex_unlock(&register_mutex);
 654        return ret;
 655}
 656EXPORT_SYMBOL(snd_rawmidi_info_select);
 657
 658static int snd_rawmidi_info_select_user(struct snd_card *card,
 659                                        struct snd_rawmidi_info __user *_info)
 660{
 661        int err;
 662        struct snd_rawmidi_info info;
 663
 664        if (get_user(info.device, &_info->device))
 665                return -EFAULT;
 666        if (get_user(info.stream, &_info->stream))
 667                return -EFAULT;
 668        if (get_user(info.subdevice, &_info->subdevice))
 669                return -EFAULT;
 670        err = snd_rawmidi_info_select(card, &info);
 671        if (err < 0)
 672                return err;
 673        if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
 674                return -EFAULT;
 675        return 0;
 676}
 677
 678static int resize_runtime_buffer(struct snd_rawmidi_runtime *runtime,
 679                                 struct snd_rawmidi_params *params,
 680                                 bool is_input)
 681{
 682        char *newbuf, *oldbuf;
 683
 684        if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L)
 685                return -EINVAL;
 686        if (params->avail_min < 1 || params->avail_min > params->buffer_size)
 687                return -EINVAL;
 688        if (params->buffer_size != runtime->buffer_size) {
 689                newbuf = kvzalloc(params->buffer_size, GFP_KERNEL);
 690                if (!newbuf)
 691                        return -ENOMEM;
 692                spin_lock_irq(&runtime->lock);
 693                if (runtime->buffer_ref) {
 694                        spin_unlock_irq(&runtime->lock);
 695                        kvfree(newbuf);
 696                        return -EBUSY;
 697                }
 698                oldbuf = runtime->buffer;
 699                runtime->buffer = newbuf;
 700                runtime->buffer_size = params->buffer_size;
 701                __reset_runtime_ptrs(runtime, is_input);
 702                spin_unlock_irq(&runtime->lock);
 703                kvfree(oldbuf);
 704        }
 705        runtime->avail_min = params->avail_min;
 706        return 0;
 707}
 708
 709int snd_rawmidi_output_params(struct snd_rawmidi_substream *substream,
 710                              struct snd_rawmidi_params *params)
 711{
 712        if (substream->append && substream->use_count > 1)
 713                return -EBUSY;
 714        snd_rawmidi_drain_output(substream);
 715        substream->active_sensing = !params->no_active_sensing;
 716        return resize_runtime_buffer(substream->runtime, params, false);
 717}
 718EXPORT_SYMBOL(snd_rawmidi_output_params);
 719
 720int snd_rawmidi_input_params(struct snd_rawmidi_substream *substream,
 721                             struct snd_rawmidi_params *params)
 722{
 723        snd_rawmidi_drain_input(substream);
 724        return resize_runtime_buffer(substream->runtime, params, true);
 725}
 726EXPORT_SYMBOL(snd_rawmidi_input_params);
 727
 728static int snd_rawmidi_output_status(struct snd_rawmidi_substream *substream,
 729                                     struct snd_rawmidi_status64 *status)
 730{
 731        struct snd_rawmidi_runtime *runtime = substream->runtime;
 732
 733        memset(status, 0, sizeof(*status));
 734        status->stream = SNDRV_RAWMIDI_STREAM_OUTPUT;
 735        spin_lock_irq(&runtime->lock);
 736        status->avail = runtime->avail;
 737        spin_unlock_irq(&runtime->lock);
 738        return 0;
 739}
 740
 741static int snd_rawmidi_input_status(struct snd_rawmidi_substream *substream,
 742                                    struct snd_rawmidi_status64 *status)
 743{
 744        struct snd_rawmidi_runtime *runtime = substream->runtime;
 745
 746        memset(status, 0, sizeof(*status));
 747        status->stream = SNDRV_RAWMIDI_STREAM_INPUT;
 748        spin_lock_irq(&runtime->lock);
 749        status->avail = runtime->avail;
 750        status->xruns = runtime->xruns;
 751        runtime->xruns = 0;
 752        spin_unlock_irq(&runtime->lock);
 753        return 0;
 754}
 755
 756static int snd_rawmidi_ioctl_status32(struct snd_rawmidi_file *rfile,
 757                                      struct snd_rawmidi_status32 __user *argp)
 758{
 759        int err = 0;
 760        struct snd_rawmidi_status32 __user *status = argp;
 761        struct snd_rawmidi_status32 status32;
 762        struct snd_rawmidi_status64 status64;
 763
 764        if (copy_from_user(&status32, argp,
 765                           sizeof(struct snd_rawmidi_status32)))
 766                return -EFAULT;
 767
 768        switch (status32.stream) {
 769        case SNDRV_RAWMIDI_STREAM_OUTPUT:
 770                if (rfile->output == NULL)
 771                        return -EINVAL;
 772                err = snd_rawmidi_output_status(rfile->output, &status64);
 773                break;
 774        case SNDRV_RAWMIDI_STREAM_INPUT:
 775                if (rfile->input == NULL)
 776                        return -EINVAL;
 777                err = snd_rawmidi_input_status(rfile->input, &status64);
 778                break;
 779        default:
 780                return -EINVAL;
 781        }
 782        if (err < 0)
 783                return err;
 784
 785        status32 = (struct snd_rawmidi_status32) {
 786                .stream = status64.stream,
 787                .tstamp_sec = status64.tstamp_sec,
 788                .tstamp_nsec = status64.tstamp_nsec,
 789                .avail = status64.avail,
 790                .xruns = status64.xruns,
 791        };
 792
 793        if (copy_to_user(status, &status32, sizeof(*status)))
 794                return -EFAULT;
 795
 796        return 0;
 797}
 798
 799static int snd_rawmidi_ioctl_status64(struct snd_rawmidi_file *rfile,
 800                                      struct snd_rawmidi_status64 __user *argp)
 801{
 802        int err = 0;
 803        struct snd_rawmidi_status64 status;
 804
 805        if (copy_from_user(&status, argp, sizeof(struct snd_rawmidi_status64)))
 806                return -EFAULT;
 807
 808        switch (status.stream) {
 809        case SNDRV_RAWMIDI_STREAM_OUTPUT:
 810                if (rfile->output == NULL)
 811                        return -EINVAL;
 812                err = snd_rawmidi_output_status(rfile->output, &status);
 813                break;
 814        case SNDRV_RAWMIDI_STREAM_INPUT:
 815                if (rfile->input == NULL)
 816                        return -EINVAL;
 817                err = snd_rawmidi_input_status(rfile->input, &status);
 818                break;
 819        default:
 820                return -EINVAL;
 821        }
 822        if (err < 0)
 823                return err;
 824        if (copy_to_user(argp, &status,
 825                         sizeof(struct snd_rawmidi_status64)))
 826                return -EFAULT;
 827        return 0;
 828}
 829
 830static long snd_rawmidi_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 831{
 832        struct snd_rawmidi_file *rfile;
 833        void __user *argp = (void __user *)arg;
 834
 835        rfile = file->private_data;
 836        if (((cmd >> 8) & 0xff) != 'W')
 837                return -ENOTTY;
 838        switch (cmd) {
 839        case SNDRV_RAWMIDI_IOCTL_PVERSION:
 840                return put_user(SNDRV_RAWMIDI_VERSION, (int __user *)argp) ? -EFAULT : 0;
 841        case SNDRV_RAWMIDI_IOCTL_INFO:
 842        {
 843                int stream;
 844                struct snd_rawmidi_info __user *info = argp;
 845
 846                if (get_user(stream, &info->stream))
 847                        return -EFAULT;
 848                switch (stream) {
 849                case SNDRV_RAWMIDI_STREAM_INPUT:
 850                        return snd_rawmidi_info_user(rfile->input, info);
 851                case SNDRV_RAWMIDI_STREAM_OUTPUT:
 852                        return snd_rawmidi_info_user(rfile->output, info);
 853                default:
 854                        return -EINVAL;
 855                }
 856        }
 857        case SNDRV_RAWMIDI_IOCTL_PARAMS:
 858        {
 859                struct snd_rawmidi_params params;
 860
 861                if (copy_from_user(&params, argp, sizeof(struct snd_rawmidi_params)))
 862                        return -EFAULT;
 863                switch (params.stream) {
 864                case SNDRV_RAWMIDI_STREAM_OUTPUT:
 865                        if (rfile->output == NULL)
 866                                return -EINVAL;
 867                        return snd_rawmidi_output_params(rfile->output, &params);
 868                case SNDRV_RAWMIDI_STREAM_INPUT:
 869                        if (rfile->input == NULL)
 870                                return -EINVAL;
 871                        return snd_rawmidi_input_params(rfile->input, &params);
 872                default:
 873                        return -EINVAL;
 874                }
 875        }
 876        case SNDRV_RAWMIDI_IOCTL_STATUS32:
 877                return snd_rawmidi_ioctl_status32(rfile, argp);
 878        case SNDRV_RAWMIDI_IOCTL_STATUS64:
 879                return snd_rawmidi_ioctl_status64(rfile, argp);
 880        case SNDRV_RAWMIDI_IOCTL_DROP:
 881        {
 882                int val;
 883
 884                if (get_user(val, (int __user *) argp))
 885                        return -EFAULT;
 886                switch (val) {
 887                case SNDRV_RAWMIDI_STREAM_OUTPUT:
 888                        if (rfile->output == NULL)
 889                                return -EINVAL;
 890                        return snd_rawmidi_drop_output(rfile->output);
 891                default:
 892                        return -EINVAL;
 893                }
 894        }
 895        case SNDRV_RAWMIDI_IOCTL_DRAIN:
 896        {
 897                int val;
 898
 899                if (get_user(val, (int __user *) argp))
 900                        return -EFAULT;
 901                switch (val) {
 902                case SNDRV_RAWMIDI_STREAM_OUTPUT:
 903                        if (rfile->output == NULL)
 904                                return -EINVAL;
 905                        return snd_rawmidi_drain_output(rfile->output);
 906                case SNDRV_RAWMIDI_STREAM_INPUT:
 907                        if (rfile->input == NULL)
 908                                return -EINVAL;
 909                        return snd_rawmidi_drain_input(rfile->input);
 910                default:
 911                        return -EINVAL;
 912                }
 913        }
 914        default:
 915                rmidi_dbg(rfile->rmidi,
 916                          "rawmidi: unknown command = 0x%x\n", cmd);
 917        }
 918        return -ENOTTY;
 919}
 920
 921static int snd_rawmidi_control_ioctl(struct snd_card *card,
 922                                     struct snd_ctl_file *control,
 923                                     unsigned int cmd,
 924                                     unsigned long arg)
 925{
 926        void __user *argp = (void __user *)arg;
 927
 928        switch (cmd) {
 929        case SNDRV_CTL_IOCTL_RAWMIDI_NEXT_DEVICE:
 930        {
 931                int device;
 932
 933                if (get_user(device, (int __user *)argp))
 934                        return -EFAULT;
 935                if (device >= SNDRV_RAWMIDI_DEVICES) /* next device is -1 */
 936                        device = SNDRV_RAWMIDI_DEVICES - 1;
 937                mutex_lock(&register_mutex);
 938                device = device < 0 ? 0 : device + 1;
 939                while (device < SNDRV_RAWMIDI_DEVICES) {
 940                        if (snd_rawmidi_search(card, device))
 941                                break;
 942                        device++;
 943                }
 944                if (device == SNDRV_RAWMIDI_DEVICES)
 945                        device = -1;
 946                mutex_unlock(&register_mutex);
 947                if (put_user(device, (int __user *)argp))
 948                        return -EFAULT;
 949                return 0;
 950        }
 951        case SNDRV_CTL_IOCTL_RAWMIDI_PREFER_SUBDEVICE:
 952        {
 953                int val;
 954
 955                if (get_user(val, (int __user *)argp))
 956                        return -EFAULT;
 957                control->preferred_subdevice[SND_CTL_SUBDEV_RAWMIDI] = val;
 958                return 0;
 959        }
 960        case SNDRV_CTL_IOCTL_RAWMIDI_INFO:
 961                return snd_rawmidi_info_select_user(card, argp);
 962        }
 963        return -ENOIOCTLCMD;
 964}
 965
 966/**
 967 * snd_rawmidi_receive - receive the input data from the device
 968 * @substream: the rawmidi substream
 969 * @buffer: the buffer pointer
 970 * @count: the data size to read
 971 *
 972 * Reads the data from the internal buffer.
 973 *
 974 * Return: The size of read data, or a negative error code on failure.
 975 */
 976int snd_rawmidi_receive(struct snd_rawmidi_substream *substream,
 977                        const unsigned char *buffer, int count)
 978{
 979        unsigned long flags;
 980        int result = 0, count1;
 981        struct snd_rawmidi_runtime *runtime = substream->runtime;
 982
 983        if (!substream->opened)
 984                return -EBADFD;
 985        if (runtime->buffer == NULL) {
 986                rmidi_dbg(substream->rmidi,
 987                          "snd_rawmidi_receive: input is not active!!!\n");
 988                return -EINVAL;
 989        }
 990        spin_lock_irqsave(&runtime->lock, flags);
 991        if (count == 1) {       /* special case, faster code */
 992                substream->bytes++;
 993                if (runtime->avail < runtime->buffer_size) {
 994                        runtime->buffer[runtime->hw_ptr++] = buffer[0];
 995                        runtime->hw_ptr %= runtime->buffer_size;
 996                        runtime->avail++;
 997                        result++;
 998                } else {
 999                        runtime->xruns++;
1000                }
1001        } else {
1002                substream->bytes += count;
1003                count1 = runtime->buffer_size - runtime->hw_ptr;
1004                if (count1 > count)
1005                        count1 = count;
1006                if (count1 > (int)(runtime->buffer_size - runtime->avail))
1007                        count1 = runtime->buffer_size - runtime->avail;
1008                memcpy(runtime->buffer + runtime->hw_ptr, buffer, count1);
1009                runtime->hw_ptr += count1;
1010                runtime->hw_ptr %= runtime->buffer_size;
1011                runtime->avail += count1;
1012                count -= count1;
1013                result += count1;
1014                if (count > 0) {
1015                        buffer += count1;
1016                        count1 = count;
1017                        if (count1 > (int)(runtime->buffer_size - runtime->avail)) {
1018                                count1 = runtime->buffer_size - runtime->avail;
1019                                runtime->xruns += count - count1;
1020                        }
1021                        if (count1 > 0) {
1022                                memcpy(runtime->buffer, buffer, count1);
1023                                runtime->hw_ptr = count1;
1024                                runtime->avail += count1;
1025                                result += count1;
1026                        }
1027                }
1028        }
1029        if (result > 0) {
1030                if (runtime->event)
1031                        schedule_work(&runtime->event_work);
1032                else if (__snd_rawmidi_ready(runtime))
1033                        wake_up(&runtime->sleep);
1034        }
1035        spin_unlock_irqrestore(&runtime->lock, flags);
1036        return result;
1037}
1038EXPORT_SYMBOL(snd_rawmidi_receive);
1039
1040static long snd_rawmidi_kernel_read1(struct snd_rawmidi_substream *substream,
1041                                     unsigned char __user *userbuf,
1042                                     unsigned char *kernelbuf, long count)
1043{
1044        unsigned long flags;
1045        long result = 0, count1;
1046        struct snd_rawmidi_runtime *runtime = substream->runtime;
1047        unsigned long appl_ptr;
1048        int err = 0;
1049
1050        spin_lock_irqsave(&runtime->lock, flags);
1051        snd_rawmidi_buffer_ref(runtime);
1052        while (count > 0 && runtime->avail) {
1053                count1 = runtime->buffer_size - runtime->appl_ptr;
1054                if (count1 > count)
1055                        count1 = count;
1056                if (count1 > (int)runtime->avail)
1057                        count1 = runtime->avail;
1058
1059                /* update runtime->appl_ptr before unlocking for userbuf */
1060                appl_ptr = runtime->appl_ptr;
1061                runtime->appl_ptr += count1;
1062                runtime->appl_ptr %= runtime->buffer_size;
1063                runtime->avail -= count1;
1064
1065                if (kernelbuf)
1066                        memcpy(kernelbuf + result, runtime->buffer + appl_ptr, count1);
1067                if (userbuf) {
1068                        spin_unlock_irqrestore(&runtime->lock, flags);
1069                        if (copy_to_user(userbuf + result,
1070                                         runtime->buffer + appl_ptr, count1))
1071                                err = -EFAULT;
1072                        spin_lock_irqsave(&runtime->lock, flags);
1073                        if (err)
1074                                goto out;
1075                }
1076                result += count1;
1077                count -= count1;
1078        }
1079 out:
1080        snd_rawmidi_buffer_unref(runtime);
1081        spin_unlock_irqrestore(&runtime->lock, flags);
1082        return result > 0 ? result : err;
1083}
1084
1085long snd_rawmidi_kernel_read(struct snd_rawmidi_substream *substream,
1086                             unsigned char *buf, long count)
1087{
1088        snd_rawmidi_input_trigger(substream, 1);
1089        return snd_rawmidi_kernel_read1(substream, NULL/*userbuf*/, buf, count);
1090}
1091EXPORT_SYMBOL(snd_rawmidi_kernel_read);
1092
1093static ssize_t snd_rawmidi_read(struct file *file, char __user *buf, size_t count,
1094                                loff_t *offset)
1095{
1096        long result;
1097        int count1;
1098        struct snd_rawmidi_file *rfile;
1099        struct snd_rawmidi_substream *substream;
1100        struct snd_rawmidi_runtime *runtime;
1101
1102        rfile = file->private_data;
1103        substream = rfile->input;
1104        if (substream == NULL)
1105                return -EIO;
1106        runtime = substream->runtime;
1107        snd_rawmidi_input_trigger(substream, 1);
1108        result = 0;
1109        while (count > 0) {
1110                spin_lock_irq(&runtime->lock);
1111                while (!__snd_rawmidi_ready(runtime)) {
1112                        wait_queue_entry_t wait;
1113
1114                        if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1115                                spin_unlock_irq(&runtime->lock);
1116                                return result > 0 ? result : -EAGAIN;
1117                        }
1118                        init_waitqueue_entry(&wait, current);
1119                        add_wait_queue(&runtime->sleep, &wait);
1120                        set_current_state(TASK_INTERRUPTIBLE);
1121                        spin_unlock_irq(&runtime->lock);
1122                        schedule();
1123                        remove_wait_queue(&runtime->sleep, &wait);
1124                        if (rfile->rmidi->card->shutdown)
1125                                return -ENODEV;
1126                        if (signal_pending(current))
1127                                return result > 0 ? result : -ERESTARTSYS;
1128                        spin_lock_irq(&runtime->lock);
1129                        if (!runtime->avail) {
1130                                spin_unlock_irq(&runtime->lock);
1131                                return result > 0 ? result : -EIO;
1132                        }
1133                }
1134                spin_unlock_irq(&runtime->lock);
1135                count1 = snd_rawmidi_kernel_read1(substream,
1136                                                  (unsigned char __user *)buf,
1137                                                  NULL/*kernelbuf*/,
1138                                                  count);
1139                if (count1 < 0)
1140                        return result > 0 ? result : count1;
1141                result += count1;
1142                buf += count1;
1143                count -= count1;
1144        }
1145        return result;
1146}
1147
1148/**
1149 * snd_rawmidi_transmit_empty - check whether the output buffer is empty
1150 * @substream: the rawmidi substream
1151 *
1152 * Return: 1 if the internal output buffer is empty, 0 if not.
1153 */
1154int snd_rawmidi_transmit_empty(struct snd_rawmidi_substream *substream)
1155{
1156        struct snd_rawmidi_runtime *runtime = substream->runtime;
1157        int result;
1158        unsigned long flags;
1159
1160        if (runtime->buffer == NULL) {
1161                rmidi_dbg(substream->rmidi,
1162                          "snd_rawmidi_transmit_empty: output is not active!!!\n");
1163                return 1;
1164        }
1165        spin_lock_irqsave(&runtime->lock, flags);
1166        result = runtime->avail >= runtime->buffer_size;
1167        spin_unlock_irqrestore(&runtime->lock, flags);
1168        return result;
1169}
1170EXPORT_SYMBOL(snd_rawmidi_transmit_empty);
1171
1172/**
1173 * __snd_rawmidi_transmit_peek - copy data from the internal buffer
1174 * @substream: the rawmidi substream
1175 * @buffer: the buffer pointer
1176 * @count: data size to transfer
1177 *
1178 * This is a variant of snd_rawmidi_transmit_peek() without spinlock.
1179 */
1180int __snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
1181                              unsigned char *buffer, int count)
1182{
1183        int result, count1;
1184        struct snd_rawmidi_runtime *runtime = substream->runtime;
1185
1186        if (runtime->buffer == NULL) {
1187                rmidi_dbg(substream->rmidi,
1188                          "snd_rawmidi_transmit_peek: output is not active!!!\n");
1189                return -EINVAL;
1190        }
1191        result = 0;
1192        if (runtime->avail >= runtime->buffer_size) {
1193                /* warning: lowlevel layer MUST trigger down the hardware */
1194                goto __skip;
1195        }
1196        if (count == 1) {       /* special case, faster code */
1197                *buffer = runtime->buffer[runtime->hw_ptr];
1198                result++;
1199        } else {
1200                count1 = runtime->buffer_size - runtime->hw_ptr;
1201                if (count1 > count)
1202                        count1 = count;
1203                if (count1 > (int)(runtime->buffer_size - runtime->avail))
1204                        count1 = runtime->buffer_size - runtime->avail;
1205                memcpy(buffer, runtime->buffer + runtime->hw_ptr, count1);
1206                count -= count1;
1207                result += count1;
1208                if (count > 0) {
1209                        if (count > (int)(runtime->buffer_size - runtime->avail - count1))
1210                                count = runtime->buffer_size - runtime->avail - count1;
1211                        memcpy(buffer + count1, runtime->buffer, count);
1212                        result += count;
1213                }
1214        }
1215      __skip:
1216        return result;
1217}
1218EXPORT_SYMBOL(__snd_rawmidi_transmit_peek);
1219
1220/**
1221 * snd_rawmidi_transmit_peek - copy data from the internal buffer
1222 * @substream: the rawmidi substream
1223 * @buffer: the buffer pointer
1224 * @count: data size to transfer
1225 *
1226 * Copies data from the internal output buffer to the given buffer.
1227 *
1228 * Call this in the interrupt handler when the midi output is ready,
1229 * and call snd_rawmidi_transmit_ack() after the transmission is
1230 * finished.
1231 *
1232 * Return: The size of copied data, or a negative error code on failure.
1233 */
1234int snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
1235                              unsigned char *buffer, int count)
1236{
1237        struct snd_rawmidi_runtime *runtime = substream->runtime;
1238        int result;
1239        unsigned long flags;
1240
1241        spin_lock_irqsave(&runtime->lock, flags);
1242        result = __snd_rawmidi_transmit_peek(substream, buffer, count);
1243        spin_unlock_irqrestore(&runtime->lock, flags);
1244        return result;
1245}
1246EXPORT_SYMBOL(snd_rawmidi_transmit_peek);
1247
1248/**
1249 * __snd_rawmidi_transmit_ack - acknowledge the transmission
1250 * @substream: the rawmidi substream
1251 * @count: the transferred count
1252 *
1253 * This is a variant of __snd_rawmidi_transmit_ack() without spinlock.
1254 */
1255int __snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count)
1256{
1257        struct snd_rawmidi_runtime *runtime = substream->runtime;
1258
1259        if (runtime->buffer == NULL) {
1260                rmidi_dbg(substream->rmidi,
1261                          "snd_rawmidi_transmit_ack: output is not active!!!\n");
1262                return -EINVAL;
1263        }
1264        snd_BUG_ON(runtime->avail + count > runtime->buffer_size);
1265        runtime->hw_ptr += count;
1266        runtime->hw_ptr %= runtime->buffer_size;
1267        runtime->avail += count;
1268        substream->bytes += count;
1269        if (count > 0) {
1270                if (runtime->drain || __snd_rawmidi_ready(runtime))
1271                        wake_up(&runtime->sleep);
1272        }
1273        return count;
1274}
1275EXPORT_SYMBOL(__snd_rawmidi_transmit_ack);
1276
1277/**
1278 * snd_rawmidi_transmit_ack - acknowledge the transmission
1279 * @substream: the rawmidi substream
1280 * @count: the transferred count
1281 *
1282 * Advances the hardware pointer for the internal output buffer with
1283 * the given size and updates the condition.
1284 * Call after the transmission is finished.
1285 *
1286 * Return: The advanced size if successful, or a negative error code on failure.
1287 */
1288int snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count)
1289{
1290        struct snd_rawmidi_runtime *runtime = substream->runtime;
1291        int result;
1292        unsigned long flags;
1293
1294        spin_lock_irqsave(&runtime->lock, flags);
1295        result = __snd_rawmidi_transmit_ack(substream, count);
1296        spin_unlock_irqrestore(&runtime->lock, flags);
1297        return result;
1298}
1299EXPORT_SYMBOL(snd_rawmidi_transmit_ack);
1300
1301/**
1302 * snd_rawmidi_transmit - copy from the buffer to the device
1303 * @substream: the rawmidi substream
1304 * @buffer: the buffer pointer
1305 * @count: the data size to transfer
1306 *
1307 * Copies data from the buffer to the device and advances the pointer.
1308 *
1309 * Return: The copied size if successful, or a negative error code on failure.
1310 */
1311int snd_rawmidi_transmit(struct snd_rawmidi_substream *substream,
1312                         unsigned char *buffer, int count)
1313{
1314        struct snd_rawmidi_runtime *runtime = substream->runtime;
1315        int result;
1316        unsigned long flags;
1317
1318        spin_lock_irqsave(&runtime->lock, flags);
1319        if (!substream->opened)
1320                result = -EBADFD;
1321        else {
1322                count = __snd_rawmidi_transmit_peek(substream, buffer, count);
1323                if (count <= 0)
1324                        result = count;
1325                else
1326                        result = __snd_rawmidi_transmit_ack(substream, count);
1327        }
1328        spin_unlock_irqrestore(&runtime->lock, flags);
1329        return result;
1330}
1331EXPORT_SYMBOL(snd_rawmidi_transmit);
1332
1333/**
1334 * snd_rawmidi_proceed - Discard the all pending bytes and proceed
1335 * @substream: rawmidi substream
1336 *
1337 * Return: the number of discarded bytes
1338 */
1339int snd_rawmidi_proceed(struct snd_rawmidi_substream *substream)
1340{
1341        struct snd_rawmidi_runtime *runtime = substream->runtime;
1342        unsigned long flags;
1343        int count = 0;
1344
1345        spin_lock_irqsave(&runtime->lock, flags);
1346        if (runtime->avail < runtime->buffer_size) {
1347                count = runtime->buffer_size - runtime->avail;
1348                __snd_rawmidi_transmit_ack(substream, count);
1349        }
1350        spin_unlock_irqrestore(&runtime->lock, flags);
1351        return count;
1352}
1353EXPORT_SYMBOL(snd_rawmidi_proceed);
1354
1355static long snd_rawmidi_kernel_write1(struct snd_rawmidi_substream *substream,
1356                                      const unsigned char __user *userbuf,
1357                                      const unsigned char *kernelbuf,
1358                                      long count)
1359{
1360        unsigned long flags;
1361        long count1, result;
1362        struct snd_rawmidi_runtime *runtime = substream->runtime;
1363        unsigned long appl_ptr;
1364
1365        if (!kernelbuf && !userbuf)
1366                return -EINVAL;
1367        if (snd_BUG_ON(!runtime->buffer))
1368                return -EINVAL;
1369
1370        result = 0;
1371        spin_lock_irqsave(&runtime->lock, flags);
1372        if (substream->append) {
1373                if ((long)runtime->avail < count) {
1374                        spin_unlock_irqrestore(&runtime->lock, flags);
1375                        return -EAGAIN;
1376                }
1377        }
1378        snd_rawmidi_buffer_ref(runtime);
1379        while (count > 0 && runtime->avail > 0) {
1380                count1 = runtime->buffer_size - runtime->appl_ptr;
1381                if (count1 > count)
1382                        count1 = count;
1383                if (count1 > (long)runtime->avail)
1384                        count1 = runtime->avail;
1385
1386                /* update runtime->appl_ptr before unlocking for userbuf */
1387                appl_ptr = runtime->appl_ptr;
1388                runtime->appl_ptr += count1;
1389                runtime->appl_ptr %= runtime->buffer_size;
1390                runtime->avail -= count1;
1391
1392                if (kernelbuf)
1393                        memcpy(runtime->buffer + appl_ptr,
1394                               kernelbuf + result, count1);
1395                else if (userbuf) {
1396                        spin_unlock_irqrestore(&runtime->lock, flags);
1397                        if (copy_from_user(runtime->buffer + appl_ptr,
1398                                           userbuf + result, count1)) {
1399                                spin_lock_irqsave(&runtime->lock, flags);
1400                                result = result > 0 ? result : -EFAULT;
1401                                goto __end;
1402                        }
1403                        spin_lock_irqsave(&runtime->lock, flags);
1404                }
1405                result += count1;
1406                count -= count1;
1407        }
1408      __end:
1409        count1 = runtime->avail < runtime->buffer_size;
1410        snd_rawmidi_buffer_unref(runtime);
1411        spin_unlock_irqrestore(&runtime->lock, flags);
1412        if (count1)
1413                snd_rawmidi_output_trigger(substream, 1);
1414        return result;
1415}
1416
1417long snd_rawmidi_kernel_write(struct snd_rawmidi_substream *substream,
1418                              const unsigned char *buf, long count)
1419{
1420        return snd_rawmidi_kernel_write1(substream, NULL, buf, count);
1421}
1422EXPORT_SYMBOL(snd_rawmidi_kernel_write);
1423
1424static ssize_t snd_rawmidi_write(struct file *file, const char __user *buf,
1425                                 size_t count, loff_t *offset)
1426{
1427        long result, timeout;
1428        int count1;
1429        struct snd_rawmidi_file *rfile;
1430        struct snd_rawmidi_runtime *runtime;
1431        struct snd_rawmidi_substream *substream;
1432
1433        rfile = file->private_data;
1434        substream = rfile->output;
1435        runtime = substream->runtime;
1436        /* we cannot put an atomic message to our buffer */
1437        if (substream->append && count > runtime->buffer_size)
1438                return -EIO;
1439        result = 0;
1440        while (count > 0) {
1441                spin_lock_irq(&runtime->lock);
1442                while (!snd_rawmidi_ready_append(substream, count)) {
1443                        wait_queue_entry_t wait;
1444
1445                        if (file->f_flags & O_NONBLOCK) {
1446                                spin_unlock_irq(&runtime->lock);
1447                                return result > 0 ? result : -EAGAIN;
1448                        }
1449                        init_waitqueue_entry(&wait, current);
1450                        add_wait_queue(&runtime->sleep, &wait);
1451                        set_current_state(TASK_INTERRUPTIBLE);
1452                        spin_unlock_irq(&runtime->lock);
1453                        timeout = schedule_timeout(30 * HZ);
1454                        remove_wait_queue(&runtime->sleep, &wait);
1455                        if (rfile->rmidi->card->shutdown)
1456                                return -ENODEV;
1457                        if (signal_pending(current))
1458                                return result > 0 ? result : -ERESTARTSYS;
1459                        spin_lock_irq(&runtime->lock);
1460                        if (!runtime->avail && !timeout) {
1461                                spin_unlock_irq(&runtime->lock);
1462                                return result > 0 ? result : -EIO;
1463                        }
1464                }
1465                spin_unlock_irq(&runtime->lock);
1466                count1 = snd_rawmidi_kernel_write1(substream, buf, NULL, count);
1467                if (count1 < 0)
1468                        return result > 0 ? result : count1;
1469                result += count1;
1470                buf += count1;
1471                if ((size_t)count1 < count && (file->f_flags & O_NONBLOCK))
1472                        break;
1473                count -= count1;
1474        }
1475        if (file->f_flags & O_DSYNC) {
1476                spin_lock_irq(&runtime->lock);
1477                while (runtime->avail != runtime->buffer_size) {
1478                        wait_queue_entry_t wait;
1479                        unsigned int last_avail = runtime->avail;
1480
1481                        init_waitqueue_entry(&wait, current);
1482                        add_wait_queue(&runtime->sleep, &wait);
1483                        set_current_state(TASK_INTERRUPTIBLE);
1484                        spin_unlock_irq(&runtime->lock);
1485                        timeout = schedule_timeout(30 * HZ);
1486                        remove_wait_queue(&runtime->sleep, &wait);
1487                        if (signal_pending(current))
1488                                return result > 0 ? result : -ERESTARTSYS;
1489                        if (runtime->avail == last_avail && !timeout)
1490                                return result > 0 ? result : -EIO;
1491                        spin_lock_irq(&runtime->lock);
1492                }
1493                spin_unlock_irq(&runtime->lock);
1494        }
1495        return result;
1496}
1497
1498static __poll_t snd_rawmidi_poll(struct file *file, poll_table *wait)
1499{
1500        struct snd_rawmidi_file *rfile;
1501        struct snd_rawmidi_runtime *runtime;
1502        __poll_t mask;
1503
1504        rfile = file->private_data;
1505        if (rfile->input != NULL) {
1506                runtime = rfile->input->runtime;
1507                snd_rawmidi_input_trigger(rfile->input, 1);
1508                poll_wait(file, &runtime->sleep, wait);
1509        }
1510        if (rfile->output != NULL) {
1511                runtime = rfile->output->runtime;
1512                poll_wait(file, &runtime->sleep, wait);
1513        }
1514        mask = 0;
1515        if (rfile->input != NULL) {
1516                if (snd_rawmidi_ready(rfile->input))
1517                        mask |= EPOLLIN | EPOLLRDNORM;
1518        }
1519        if (rfile->output != NULL) {
1520                if (snd_rawmidi_ready(rfile->output))
1521                        mask |= EPOLLOUT | EPOLLWRNORM;
1522        }
1523        return mask;
1524}
1525
1526/*
1527 */
1528#ifdef CONFIG_COMPAT
1529#include "rawmidi_compat.c"
1530#else
1531#define snd_rawmidi_ioctl_compat        NULL
1532#endif
1533
1534/*
1535 */
1536
1537static void snd_rawmidi_proc_info_read(struct snd_info_entry *entry,
1538                                       struct snd_info_buffer *buffer)
1539{
1540        struct snd_rawmidi *rmidi;
1541        struct snd_rawmidi_substream *substream;
1542        struct snd_rawmidi_runtime *runtime;
1543        unsigned long buffer_size, avail, xruns;
1544
1545        rmidi = entry->private_data;
1546        snd_iprintf(buffer, "%s\n\n", rmidi->name);
1547        mutex_lock(&rmidi->open_mutex);
1548        if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_OUTPUT) {
1549                list_for_each_entry(substream,
1550                                    &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams,
1551                                    list) {
1552                        snd_iprintf(buffer,
1553                                    "Output %d\n"
1554                                    "  Tx bytes     : %lu\n",
1555                                    substream->number,
1556                                    (unsigned long) substream->bytes);
1557                        if (substream->opened) {
1558                                snd_iprintf(buffer,
1559                                    "  Owner PID    : %d\n",
1560                                    pid_vnr(substream->pid));
1561                                runtime = substream->runtime;
1562                                spin_lock_irq(&runtime->lock);
1563                                buffer_size = runtime->buffer_size;
1564                                avail = runtime->avail;
1565                                spin_unlock_irq(&runtime->lock);
1566                                snd_iprintf(buffer,
1567                                    "  Mode         : %s\n"
1568                                    "  Buffer size  : %lu\n"
1569                                    "  Avail        : %lu\n",
1570                                    runtime->oss ? "OSS compatible" : "native",
1571                                    buffer_size, avail);
1572                        }
1573                }
1574        }
1575        if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_INPUT) {
1576                list_for_each_entry(substream,
1577                                    &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams,
1578                                    list) {
1579                        snd_iprintf(buffer,
1580                                    "Input %d\n"
1581                                    "  Rx bytes     : %lu\n",
1582                                    substream->number,
1583                                    (unsigned long) substream->bytes);
1584                        if (substream->opened) {
1585                                snd_iprintf(buffer,
1586                                            "  Owner PID    : %d\n",
1587                                            pid_vnr(substream->pid));
1588                                runtime = substream->runtime;
1589                                spin_lock_irq(&runtime->lock);
1590                                buffer_size = runtime->buffer_size;
1591                                avail = runtime->avail;
1592                                xruns = runtime->xruns;
1593                                spin_unlock_irq(&runtime->lock);
1594                                snd_iprintf(buffer,
1595                                            "  Buffer size  : %lu\n"
1596                                            "  Avail        : %lu\n"
1597                                            "  Overruns     : %lu\n",
1598                                            buffer_size, avail, xruns);
1599                        }
1600                }
1601        }
1602        mutex_unlock(&rmidi->open_mutex);
1603}
1604
1605/*
1606 *  Register functions
1607 */
1608
1609static const struct file_operations snd_rawmidi_f_ops = {
1610        .owner =        THIS_MODULE,
1611        .read =         snd_rawmidi_read,
1612        .write =        snd_rawmidi_write,
1613        .open =         snd_rawmidi_open,
1614        .release =      snd_rawmidi_release,
1615        .llseek =       no_llseek,
1616        .poll =         snd_rawmidi_poll,
1617        .unlocked_ioctl =       snd_rawmidi_ioctl,
1618        .compat_ioctl = snd_rawmidi_ioctl_compat,
1619};
1620
1621static int snd_rawmidi_alloc_substreams(struct snd_rawmidi *rmidi,
1622                                        struct snd_rawmidi_str *stream,
1623                                        int direction,
1624                                        int count)
1625{
1626        struct snd_rawmidi_substream *substream;
1627        int idx;
1628
1629        for (idx = 0; idx < count; idx++) {
1630                substream = kzalloc(sizeof(*substream), GFP_KERNEL);
1631                if (!substream)
1632                        return -ENOMEM;
1633                substream->stream = direction;
1634                substream->number = idx;
1635                substream->rmidi = rmidi;
1636                substream->pstr = stream;
1637                list_add_tail(&substream->list, &stream->substreams);
1638                stream->substream_count++;
1639        }
1640        return 0;
1641}
1642
1643static void release_rawmidi_device(struct device *dev)
1644{
1645        kfree(container_of(dev, struct snd_rawmidi, dev));
1646}
1647
1648/**
1649 * snd_rawmidi_new - create a rawmidi instance
1650 * @card: the card instance
1651 * @id: the id string
1652 * @device: the device index
1653 * @output_count: the number of output streams
1654 * @input_count: the number of input streams
1655 * @rrawmidi: the pointer to store the new rawmidi instance
1656 *
1657 * Creates a new rawmidi instance.
1658 * Use snd_rawmidi_set_ops() to set the operators to the new instance.
1659 *
1660 * Return: Zero if successful, or a negative error code on failure.
1661 */
1662int snd_rawmidi_new(struct snd_card *card, char *id, int device,
1663                    int output_count, int input_count,
1664                    struct snd_rawmidi **rrawmidi)
1665{
1666        struct snd_rawmidi *rmidi;
1667        int err;
1668        static const struct snd_device_ops ops = {
1669                .dev_free = snd_rawmidi_dev_free,
1670                .dev_register = snd_rawmidi_dev_register,
1671                .dev_disconnect = snd_rawmidi_dev_disconnect,
1672        };
1673
1674        if (snd_BUG_ON(!card))
1675                return -ENXIO;
1676        if (rrawmidi)
1677                *rrawmidi = NULL;
1678        rmidi = kzalloc(sizeof(*rmidi), GFP_KERNEL);
1679        if (!rmidi)
1680                return -ENOMEM;
1681        rmidi->card = card;
1682        rmidi->device = device;
1683        mutex_init(&rmidi->open_mutex);
1684        init_waitqueue_head(&rmidi->open_wait);
1685        INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams);
1686        INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams);
1687
1688        if (id != NULL)
1689                strscpy(rmidi->id, id, sizeof(rmidi->id));
1690
1691        snd_device_initialize(&rmidi->dev, card);
1692        rmidi->dev.release = release_rawmidi_device;
1693        dev_set_name(&rmidi->dev, "midiC%iD%i", card->number, device);
1694
1695        err = snd_rawmidi_alloc_substreams(rmidi,
1696                                           &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT],
1697                                           SNDRV_RAWMIDI_STREAM_INPUT,
1698                                           input_count);
1699        if (err < 0)
1700                goto error;
1701        err = snd_rawmidi_alloc_substreams(rmidi,
1702                                           &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT],
1703                                           SNDRV_RAWMIDI_STREAM_OUTPUT,
1704                                           output_count);
1705        if (err < 0)
1706                goto error;
1707        err = snd_device_new(card, SNDRV_DEV_RAWMIDI, rmidi, &ops);
1708        if (err < 0)
1709                goto error;
1710
1711        if (rrawmidi)
1712                *rrawmidi = rmidi;
1713        return 0;
1714
1715 error:
1716        snd_rawmidi_free(rmidi);
1717        return err;
1718}
1719EXPORT_SYMBOL(snd_rawmidi_new);
1720
1721static void snd_rawmidi_free_substreams(struct snd_rawmidi_str *stream)
1722{
1723        struct snd_rawmidi_substream *substream;
1724
1725        while (!list_empty(&stream->substreams)) {
1726                substream = list_entry(stream->substreams.next, struct snd_rawmidi_substream, list);
1727                list_del(&substream->list);
1728                kfree(substream);
1729        }
1730}
1731
1732static int snd_rawmidi_free(struct snd_rawmidi *rmidi)
1733{
1734        if (!rmidi)
1735                return 0;
1736
1737        snd_info_free_entry(rmidi->proc_entry);
1738        rmidi->proc_entry = NULL;
1739        mutex_lock(&register_mutex);
1740        if (rmidi->ops && rmidi->ops->dev_unregister)
1741                rmidi->ops->dev_unregister(rmidi);
1742        mutex_unlock(&register_mutex);
1743
1744        snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT]);
1745        snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT]);
1746        if (rmidi->private_free)
1747                rmidi->private_free(rmidi);
1748        put_device(&rmidi->dev);
1749        return 0;
1750}
1751
1752static int snd_rawmidi_dev_free(struct snd_device *device)
1753{
1754        struct snd_rawmidi *rmidi = device->device_data;
1755
1756        return snd_rawmidi_free(rmidi);
1757}
1758
1759#if IS_ENABLED(CONFIG_SND_SEQUENCER)
1760static void snd_rawmidi_dev_seq_free(struct snd_seq_device *device)
1761{
1762        struct snd_rawmidi *rmidi = device->private_data;
1763
1764        rmidi->seq_dev = NULL;
1765}
1766#endif
1767
1768static int snd_rawmidi_dev_register(struct snd_device *device)
1769{
1770        int err;
1771        struct snd_info_entry *entry;
1772        char name[16];
1773        struct snd_rawmidi *rmidi = device->device_data;
1774
1775        if (rmidi->device >= SNDRV_RAWMIDI_DEVICES)
1776                return -ENOMEM;
1777        err = 0;
1778        mutex_lock(&register_mutex);
1779        if (snd_rawmidi_search(rmidi->card, rmidi->device))
1780                err = -EBUSY;
1781        else
1782                list_add_tail(&rmidi->list, &snd_rawmidi_devices);
1783        mutex_unlock(&register_mutex);
1784        if (err < 0)
1785                return err;
1786
1787        err = snd_register_device(SNDRV_DEVICE_TYPE_RAWMIDI,
1788                                  rmidi->card, rmidi->device,
1789                                  &snd_rawmidi_f_ops, rmidi, &rmidi->dev);
1790        if (err < 0) {
1791                rmidi_err(rmidi, "unable to register\n");
1792                goto error;
1793        }
1794        if (rmidi->ops && rmidi->ops->dev_register) {
1795                err = rmidi->ops->dev_register(rmidi);
1796                if (err < 0)
1797                        goto error_unregister;
1798        }
1799#ifdef CONFIG_SND_OSSEMUL
1800        rmidi->ossreg = 0;
1801        if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1802                if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1803                                            rmidi->card, 0, &snd_rawmidi_f_ops,
1804                                            rmidi) < 0) {
1805                        rmidi_err(rmidi,
1806                                  "unable to register OSS rawmidi device %i:%i\n",
1807                                  rmidi->card->number, 0);
1808                } else {
1809                        rmidi->ossreg++;
1810#ifdef SNDRV_OSS_INFO_DEV_MIDI
1811                        snd_oss_info_register(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number, rmidi->name);
1812#endif
1813                }
1814        }
1815        if ((int)rmidi->device == amidi_map[rmidi->card->number]) {
1816                if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1817                                            rmidi->card, 1, &snd_rawmidi_f_ops,
1818                                            rmidi) < 0) {
1819                        rmidi_err(rmidi,
1820                                  "unable to register OSS rawmidi device %i:%i\n",
1821                                  rmidi->card->number, 1);
1822                } else {
1823                        rmidi->ossreg++;
1824                }
1825        }
1826#endif /* CONFIG_SND_OSSEMUL */
1827        sprintf(name, "midi%d", rmidi->device);
1828        entry = snd_info_create_card_entry(rmidi->card, name, rmidi->card->proc_root);
1829        if (entry) {
1830                entry->private_data = rmidi;
1831                entry->c.text.read = snd_rawmidi_proc_info_read;
1832                if (snd_info_register(entry) < 0) {
1833                        snd_info_free_entry(entry);
1834                        entry = NULL;
1835                }
1836        }
1837        rmidi->proc_entry = entry;
1838#if IS_ENABLED(CONFIG_SND_SEQUENCER)
1839        if (!rmidi->ops || !rmidi->ops->dev_register) { /* own registration mechanism */
1840                if (snd_seq_device_new(rmidi->card, rmidi->device, SNDRV_SEQ_DEV_ID_MIDISYNTH, 0, &rmidi->seq_dev) >= 0) {
1841                        rmidi->seq_dev->private_data = rmidi;
1842                        rmidi->seq_dev->private_free = snd_rawmidi_dev_seq_free;
1843                        sprintf(rmidi->seq_dev->name, "MIDI %d-%d", rmidi->card->number, rmidi->device);
1844                        snd_device_register(rmidi->card, rmidi->seq_dev);
1845                }
1846        }
1847#endif
1848        return 0;
1849
1850 error_unregister:
1851        snd_unregister_device(&rmidi->dev);
1852 error:
1853        mutex_lock(&register_mutex);
1854        list_del(&rmidi->list);
1855        mutex_unlock(&register_mutex);
1856        return err;
1857}
1858
1859static int snd_rawmidi_dev_disconnect(struct snd_device *device)
1860{
1861        struct snd_rawmidi *rmidi = device->device_data;
1862        int dir;
1863
1864        mutex_lock(&register_mutex);
1865        mutex_lock(&rmidi->open_mutex);
1866        wake_up(&rmidi->open_wait);
1867        list_del_init(&rmidi->list);
1868        for (dir = 0; dir < 2; dir++) {
1869                struct snd_rawmidi_substream *s;
1870
1871                list_for_each_entry(s, &rmidi->streams[dir].substreams, list) {
1872                        if (s->runtime)
1873                                wake_up(&s->runtime->sleep);
1874                }
1875        }
1876
1877#ifdef CONFIG_SND_OSSEMUL
1878        if (rmidi->ossreg) {
1879                if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1880                        snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 0);
1881#ifdef SNDRV_OSS_INFO_DEV_MIDI
1882                        snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number);
1883#endif
1884                }
1885                if ((int)rmidi->device == amidi_map[rmidi->card->number])
1886                        snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 1);
1887                rmidi->ossreg = 0;
1888        }
1889#endif /* CONFIG_SND_OSSEMUL */
1890        snd_unregister_device(&rmidi->dev);
1891        mutex_unlock(&rmidi->open_mutex);
1892        mutex_unlock(&register_mutex);
1893        return 0;
1894}
1895
1896/**
1897 * snd_rawmidi_set_ops - set the rawmidi operators
1898 * @rmidi: the rawmidi instance
1899 * @stream: the stream direction, SNDRV_RAWMIDI_STREAM_XXX
1900 * @ops: the operator table
1901 *
1902 * Sets the rawmidi operators for the given stream direction.
1903 */
1904void snd_rawmidi_set_ops(struct snd_rawmidi *rmidi, int stream,
1905                         const struct snd_rawmidi_ops *ops)
1906{
1907        struct snd_rawmidi_substream *substream;
1908
1909        list_for_each_entry(substream, &rmidi->streams[stream].substreams, list)
1910                substream->ops = ops;
1911}
1912EXPORT_SYMBOL(snd_rawmidi_set_ops);
1913
1914/*
1915 *  ENTRY functions
1916 */
1917
1918static int __init alsa_rawmidi_init(void)
1919{
1920
1921        snd_ctl_register_ioctl(snd_rawmidi_control_ioctl);
1922        snd_ctl_register_ioctl_compat(snd_rawmidi_control_ioctl);
1923#ifdef CONFIG_SND_OSSEMUL
1924        { int i;
1925        /* check device map table */
1926        for (i = 0; i < SNDRV_CARDS; i++) {
1927                if (midi_map[i] < 0 || midi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1928                        pr_err("ALSA: rawmidi: invalid midi_map[%d] = %d\n",
1929                               i, midi_map[i]);
1930                        midi_map[i] = 0;
1931                }
1932                if (amidi_map[i] < 0 || amidi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1933                        pr_err("ALSA: rawmidi: invalid amidi_map[%d] = %d\n",
1934                               i, amidi_map[i]);
1935                        amidi_map[i] = 1;
1936                }
1937        }
1938        }
1939#endif /* CONFIG_SND_OSSEMUL */
1940        return 0;
1941}
1942
1943static void __exit alsa_rawmidi_exit(void)
1944{
1945        snd_ctl_unregister_ioctl(snd_rawmidi_control_ioctl);
1946        snd_ctl_unregister_ioctl_compat(snd_rawmidi_control_ioctl);
1947}
1948
1949module_init(alsa_rawmidi_init)
1950module_exit(alsa_rawmidi_exit)
1951