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#include <sound/ump.h> 25 26MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>"); 27MODULE_DESCRIPTION("Midlevel RawMidi code for ALSA."); 28MODULE_LICENSE("GPL"); 29 30#ifdef CONFIG_SND_OSSEMUL 31static int midi_map[SNDRV_CARDS]; 32static int amidi_map[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS-1)] = 1}; 33module_param_array(midi_map, int, NULL, 0444); 34MODULE_PARM_DESC(midi_map, "Raw MIDI device number assigned to 1st OSS device."); 35module_param_array(amidi_map, int, NULL, 0444); 36MODULE_PARM_DESC(amidi_map, "Raw MIDI device number assigned to 2nd OSS device."); 37#endif /* CONFIG_SND_OSSEMUL */ 38 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 76#define rawmidi_is_ump(rmidi) \ 77 (IS_ENABLED(CONFIG_SND_UMP) && ((rmidi)->info_flags & SNDRV_RAWMIDI_INFO_UMP)) 78 79static struct snd_rawmidi *snd_rawmidi_search(struct snd_card *card, int device) 80{ 81 struct snd_rawmidi *rawmidi; 82 83 list_for_each_entry(rawmidi, &snd_rawmidi_devices, list) 84 if (rawmidi->card == card && rawmidi->device == device) 85 return rawmidi; 86 return NULL; 87} 88 89static inline unsigned short snd_rawmidi_file_flags(struct file *file) 90{ 91 switch (file->f_mode & (FMODE_READ | FMODE_WRITE)) { 92 case FMODE_WRITE: 93 return SNDRV_RAWMIDI_LFLG_OUTPUT; 94 case FMODE_READ: 95 return SNDRV_RAWMIDI_LFLG_INPUT; 96 default: 97 return SNDRV_RAWMIDI_LFLG_OPEN; 98 } 99} 100 101static inline bool __snd_rawmidi_ready(struct snd_rawmidi_runtime *runtime) 102{ 103 return runtime->avail >= runtime->avail_min; 104} 105 106static bool snd_rawmidi_ready(struct snd_rawmidi_substream *substream) 107{ 108 unsigned long flags; 109 bool ready; 110 111 spin_lock_irqsave(&substream->lock, flags); 112 ready = __snd_rawmidi_ready(substream->runtime); 113 spin_unlock_irqrestore(&substream->lock, flags); 114 return ready; 115} 116 117static inline int snd_rawmidi_ready_append(struct snd_rawmidi_substream *substream, 118 size_t count) 119{ 120 struct snd_rawmidi_runtime *runtime = substream->runtime; 121 122 return runtime->avail >= runtime->avail_min && 123 (!substream->append || runtime->avail >= count); 124} 125 126static void snd_rawmidi_input_event_work(struct work_struct *work) 127{ 128 struct snd_rawmidi_runtime *runtime = 129 container_of(work, struct snd_rawmidi_runtime, event_work); 130 131 if (runtime->event) 132 runtime->event(runtime->substream); 133} 134 135/* buffer refcount management: call with substream->lock held */ 136static inline void snd_rawmidi_buffer_ref(struct snd_rawmidi_runtime *runtime) 137{ 138 runtime->buffer_ref++; 139} 140 141static inline void snd_rawmidi_buffer_unref(struct snd_rawmidi_runtime *runtime) 142{ 143 runtime->buffer_ref--; 144} 145 146static void snd_rawmidi_buffer_ref_sync(struct snd_rawmidi_substream *substream) 147{ 148 int loop = HZ; 149 150 spin_lock_irq(&substream->lock); 151 while (substream->runtime->buffer_ref) { 152 spin_unlock_irq(&substream->lock); 153 if (!--loop) { 154 rmidi_err(substream->rmidi, "Buffer ref sync timeout\n"); 155 return; 156 } 157 schedule_timeout_uninterruptible(1); 158 spin_lock_irq(&substream->lock); 159 } 160 spin_unlock_irq(&substream->lock); 161} 162 163static int snd_rawmidi_runtime_create(struct snd_rawmidi_substream *substream) 164{ 165 struct snd_rawmidi_runtime *runtime; 166 167 runtime = kzalloc(sizeof(*runtime), GFP_KERNEL); 168 if (!runtime) 169 return -ENOMEM; 170 runtime->substream = substream; 171 init_waitqueue_head(&runtime->sleep); 172 INIT_WORK(&runtime->event_work, snd_rawmidi_input_event_work); 173 runtime->event = NULL; 174 runtime->buffer_size = PAGE_SIZE; 175 runtime->avail_min = 1; 176 if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT) 177 runtime->avail = 0; 178 else 179 runtime->avail = runtime->buffer_size; 180 runtime->buffer = kvzalloc(runtime->buffer_size, GFP_KERNEL); 181 if (!runtime->buffer) { 182 kfree(runtime); 183 return -ENOMEM; 184 } 185 runtime->appl_ptr = runtime->hw_ptr = 0; 186 substream->runtime = runtime; 187 if (rawmidi_is_ump(substream->rmidi)) 188 runtime->align = 3; 189 return 0; 190} 191 192/* get the current alignment (either 0 or 3) */ 193static inline int get_align(struct snd_rawmidi_runtime *runtime) 194{ 195 if (IS_ENABLED(CONFIG_SND_UMP)) 196 return runtime->align; 197 else 198 return 0; 199} 200 201/* get the trimmed size with the current alignment */ 202#define get_aligned_size(runtime, size) ((size) & ~get_align(runtime)) 203 204static int snd_rawmidi_runtime_free(struct snd_rawmidi_substream *substream) 205{ 206 struct snd_rawmidi_runtime *runtime = substream->runtime; 207 208 kvfree(runtime->buffer); 209 kfree(runtime); 210 substream->runtime = NULL; 211 return 0; 212} 213 214static inline void snd_rawmidi_output_trigger(struct snd_rawmidi_substream *substream, int up) 215{ 216 if (!substream->opened) 217 return; 218 substream->ops->trigger(substream, up); 219} 220 221static void snd_rawmidi_input_trigger(struct snd_rawmidi_substream *substream, int up) 222{ 223 if (!substream->opened) 224 return; 225 substream->ops->trigger(substream, up); 226 if (!up) 227 cancel_work_sync(&substream->runtime->event_work); 228} 229 230static void __reset_runtime_ptrs(struct snd_rawmidi_runtime *runtime, 231 bool is_input) 232{ 233 runtime->drain = 0; 234 runtime->appl_ptr = runtime->hw_ptr = 0; 235 runtime->avail = is_input ? 0 : runtime->buffer_size; 236} 237 238static void reset_runtime_ptrs(struct snd_rawmidi_substream *substream, 239 bool is_input) 240{ 241 unsigned long flags; 242 243 spin_lock_irqsave(&substream->lock, flags); 244 if (substream->opened && substream->runtime) 245 __reset_runtime_ptrs(substream->runtime, is_input); 246 spin_unlock_irqrestore(&substream->lock, flags); 247} 248 249int snd_rawmidi_drop_output(struct snd_rawmidi_substream *substream) 250{ 251 snd_rawmidi_output_trigger(substream, 0); 252 reset_runtime_ptrs(substream, false); 253 return 0; 254} 255EXPORT_SYMBOL(snd_rawmidi_drop_output); 256 257int snd_rawmidi_drain_output(struct snd_rawmidi_substream *substream) 258{ 259 int err = 0; 260 long timeout; 261 struct snd_rawmidi_runtime *runtime; 262 263 spin_lock_irq(&substream->lock); 264 runtime = substream->runtime; 265 if (!substream->opened || !runtime || !runtime->buffer) { 266 err = -EINVAL; 267 } else { 268 snd_rawmidi_buffer_ref(runtime); 269 runtime->drain = 1; 270 } 271 spin_unlock_irq(&substream->lock); 272 if (err < 0) 273 return err; 274 275 timeout = wait_event_interruptible_timeout(runtime->sleep, 276 (runtime->avail >= runtime->buffer_size), 277 10*HZ); 278 279 spin_lock_irq(&substream->lock); 280 if (signal_pending(current)) 281 err = -ERESTARTSYS; 282 if (runtime->avail < runtime->buffer_size && !timeout) { 283 rmidi_warn(substream->rmidi, 284 "rawmidi drain error (avail = %li, buffer_size = %li)\n", 285 (long)runtime->avail, (long)runtime->buffer_size); 286 err = -EIO; 287 } 288 runtime->drain = 0; 289 spin_unlock_irq(&substream->lock); 290 291 if (err != -ERESTARTSYS) { 292 /* we need wait a while to make sure that Tx FIFOs are empty */ 293 if (substream->ops->drain) 294 substream->ops->drain(substream); 295 else 296 msleep(50); 297 snd_rawmidi_drop_output(substream); 298 } 299 300 spin_lock_irq(&substream->lock); 301 snd_rawmidi_buffer_unref(runtime); 302 spin_unlock_irq(&substream->lock); 303 304 return err; 305} 306EXPORT_SYMBOL(snd_rawmidi_drain_output); 307 308int snd_rawmidi_drain_input(struct snd_rawmidi_substream *substream) 309{ 310 snd_rawmidi_input_trigger(substream, 0); 311 reset_runtime_ptrs(substream, true); 312 return 0; 313} 314EXPORT_SYMBOL(snd_rawmidi_drain_input); 315 316/* look for an available substream for the given stream direction; 317 * if a specific subdevice is given, try to assign it 318 */ 319static int assign_substream(struct snd_rawmidi *rmidi, int subdevice, 320 int stream, int mode, 321 struct snd_rawmidi_substream **sub_ret) 322{ 323 struct snd_rawmidi_substream *substream; 324 struct snd_rawmidi_str *s = &rmidi->streams[stream]; 325 static const unsigned int info_flags[2] = { 326 [SNDRV_RAWMIDI_STREAM_OUTPUT] = SNDRV_RAWMIDI_INFO_OUTPUT, 327 [SNDRV_RAWMIDI_STREAM_INPUT] = SNDRV_RAWMIDI_INFO_INPUT, 328 }; 329 330 if (!(rmidi->info_flags & info_flags[stream])) 331 return -ENXIO; 332 if (subdevice >= 0 && subdevice >= s->substream_count) 333 return -ENODEV; 334 335 list_for_each_entry(substream, &s->substreams, list) { 336 if (substream->opened) { 337 if (stream == SNDRV_RAWMIDI_STREAM_INPUT || 338 !(mode & SNDRV_RAWMIDI_LFLG_APPEND) || 339 !substream->append) 340 continue; 341 } 342 if (subdevice < 0 || subdevice == substream->number) { 343 *sub_ret = substream; 344 return 0; 345 } 346 } 347 return -EAGAIN; 348} 349 350/* open and do ref-counting for the given substream */ 351static int open_substream(struct snd_rawmidi *rmidi, 352 struct snd_rawmidi_substream *substream, 353 int mode) 354{ 355 int err; 356 357 if (substream->use_count == 0) { 358 err = snd_rawmidi_runtime_create(substream); 359 if (err < 0) 360 return err; 361 err = substream->ops->open(substream); 362 if (err < 0) { 363 snd_rawmidi_runtime_free(substream); 364 return err; 365 } 366 spin_lock_irq(&substream->lock); 367 substream->opened = 1; 368 substream->active_sensing = 0; 369 if (mode & SNDRV_RAWMIDI_LFLG_APPEND) 370 substream->append = 1; 371 substream->pid = get_pid(task_pid(current)); 372 rmidi->streams[substream->stream].substream_opened++; 373 spin_unlock_irq(&substream->lock); 374 } 375 substream->use_count++; 376 return 0; 377} 378 379static void close_substream(struct snd_rawmidi *rmidi, 380 struct snd_rawmidi_substream *substream, 381 int cleanup); 382 383static int rawmidi_open_priv(struct snd_rawmidi *rmidi, int subdevice, int mode, 384 struct snd_rawmidi_file *rfile) 385{ 386 struct snd_rawmidi_substream *sinput = NULL, *soutput = NULL; 387 int err; 388 389 rfile->input = rfile->output = NULL; 390 if (mode & SNDRV_RAWMIDI_LFLG_INPUT) { 391 err = assign_substream(rmidi, subdevice, 392 SNDRV_RAWMIDI_STREAM_INPUT, 393 mode, &sinput); 394 if (err < 0) 395 return err; 396 } 397 if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) { 398 err = assign_substream(rmidi, subdevice, 399 SNDRV_RAWMIDI_STREAM_OUTPUT, 400 mode, &soutput); 401 if (err < 0) 402 return err; 403 } 404 405 if (sinput) { 406 err = open_substream(rmidi, sinput, mode); 407 if (err < 0) 408 return err; 409 } 410 if (soutput) { 411 err = open_substream(rmidi, soutput, mode); 412 if (err < 0) { 413 if (sinput) 414 close_substream(rmidi, sinput, 0); 415 return err; 416 } 417 } 418 419 rfile->rmidi = rmidi; 420 rfile->input = sinput; 421 rfile->output = soutput; 422 return 0; 423} 424 425/* called from sound/core/seq/seq_midi.c */ 426int snd_rawmidi_kernel_open(struct snd_rawmidi *rmidi, int subdevice, 427 int mode, struct snd_rawmidi_file *rfile) 428{ 429 int err; 430 431 if (snd_BUG_ON(!rfile)) 432 return -EINVAL; 433 if (!try_module_get(rmidi->card->module)) 434 return -ENXIO; 435 436 mutex_lock(&rmidi->open_mutex); 437 err = rawmidi_open_priv(rmidi, subdevice, mode, rfile); 438 mutex_unlock(&rmidi->open_mutex); 439 if (err < 0) 440 module_put(rmidi->card->module); 441 return err; 442} 443EXPORT_SYMBOL(snd_rawmidi_kernel_open); 444 445static int snd_rawmidi_open(struct inode *inode, struct file *file) 446{ 447 int maj = imajor(inode); 448 struct snd_card *card; 449 int subdevice; 450 unsigned short fflags; 451 int err; 452 struct snd_rawmidi *rmidi; 453 struct snd_rawmidi_file *rawmidi_file = NULL; 454 wait_queue_entry_t wait; 455 456 if ((file->f_flags & O_APPEND) && !(file->f_flags & O_NONBLOCK)) 457 return -EINVAL; /* invalid combination */ 458 459 err = stream_open(inode, file); 460 if (err < 0) 461 return err; 462 463 if (maj == snd_major) { 464 rmidi = snd_lookup_minor_data(iminor(inode), 465 SNDRV_DEVICE_TYPE_RAWMIDI); 466#ifdef CONFIG_SND_OSSEMUL 467 } else if (maj == SOUND_MAJOR) { 468 rmidi = snd_lookup_oss_minor_data(iminor(inode), 469 SNDRV_OSS_DEVICE_TYPE_MIDI); 470#endif 471 } else 472 return -ENXIO; 473 474 if (rmidi == NULL) 475 return -ENODEV; 476 477 if (!try_module_get(rmidi->card->module)) { 478 snd_card_unref(rmidi->card); 479 return -ENXIO; 480 } 481 482 mutex_lock(&rmidi->open_mutex); 483 card = rmidi->card; 484 err = snd_card_file_add(card, file); 485 if (err < 0) 486 goto __error_card; 487 fflags = snd_rawmidi_file_flags(file); 488 if ((file->f_flags & O_APPEND) || maj == SOUND_MAJOR) /* OSS emul? */ 489 fflags |= SNDRV_RAWMIDI_LFLG_APPEND; 490 rawmidi_file = kmalloc(sizeof(*rawmidi_file), GFP_KERNEL); 491 if (rawmidi_file == NULL) { 492 err = -ENOMEM; 493 goto __error; 494 } 495 rawmidi_file->user_pversion = 0; 496 init_waitqueue_entry(&wait, current); 497 add_wait_queue(&rmidi->open_wait, &wait); 498 while (1) { 499 subdevice = snd_ctl_get_preferred_subdevice(card, SND_CTL_SUBDEV_RAWMIDI); 500 err = rawmidi_open_priv(rmidi, subdevice, fflags, rawmidi_file); 501 if (err >= 0) 502 break; 503 if (err == -EAGAIN) { 504 if (file->f_flags & O_NONBLOCK) { 505 err = -EBUSY; 506 break; 507 } 508 } else 509 break; 510 set_current_state(TASK_INTERRUPTIBLE); 511 mutex_unlock(&rmidi->open_mutex); 512 schedule(); 513 mutex_lock(&rmidi->open_mutex); 514 if (rmidi->card->shutdown) { 515 err = -ENODEV; 516 break; 517 } 518 if (signal_pending(current)) { 519 err = -ERESTARTSYS; 520 break; 521 } 522 } 523 remove_wait_queue(&rmidi->open_wait, &wait); 524 if (err < 0) { 525 kfree(rawmidi_file); 526 goto __error; 527 } 528#ifdef CONFIG_SND_OSSEMUL 529 if (rawmidi_file->input && rawmidi_file->input->runtime) 530 rawmidi_file->input->runtime->oss = (maj == SOUND_MAJOR); 531 if (rawmidi_file->output && rawmidi_file->output->runtime) 532 rawmidi_file->output->runtime->oss = (maj == SOUND_MAJOR); 533#endif 534 file->private_data = rawmidi_file; 535 mutex_unlock(&rmidi->open_mutex); 536 snd_card_unref(rmidi->card); 537 return 0; 538 539 __error: 540 snd_card_file_remove(card, file); 541 __error_card: 542 mutex_unlock(&rmidi->open_mutex); 543 module_put(rmidi->card->module); 544 snd_card_unref(rmidi->card); 545 return err; 546} 547 548static void close_substream(struct snd_rawmidi *rmidi, 549 struct snd_rawmidi_substream *substream, 550 int cleanup) 551{ 552 if (--substream->use_count) 553 return; 554 555 if (cleanup) { 556 if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT) 557 snd_rawmidi_input_trigger(substream, 0); 558 else { 559 if (substream->active_sensing) { 560 unsigned char buf = 0xfe; 561 /* sending single active sensing message 562 * to shut the device up 563 */ 564 snd_rawmidi_kernel_write(substream, &buf, 1); 565 } 566 if (snd_rawmidi_drain_output(substream) == -ERESTARTSYS) 567 snd_rawmidi_output_trigger(substream, 0); 568 } 569 snd_rawmidi_buffer_ref_sync(substream); 570 } 571 spin_lock_irq(&substream->lock); 572 substream->opened = 0; 573 substream->append = 0; 574 spin_unlock_irq(&substream->lock); 575 substream->ops->close(substream); 576 if (substream->runtime->private_free) 577 substream->runtime->private_free(substream); 578 snd_rawmidi_runtime_free(substream); 579 put_pid(substream->pid); 580 substream->pid = NULL; 581 rmidi->streams[substream->stream].substream_opened--; 582} 583 584static void rawmidi_release_priv(struct snd_rawmidi_file *rfile) 585{ 586 struct snd_rawmidi *rmidi; 587 588 rmidi = rfile->rmidi; 589 mutex_lock(&rmidi->open_mutex); 590 if (rfile->input) { 591 close_substream(rmidi, rfile->input, 1); 592 rfile->input = NULL; 593 } 594 if (rfile->output) { 595 close_substream(rmidi, rfile->output, 1); 596 rfile->output = NULL; 597 } 598 rfile->rmidi = NULL; 599 mutex_unlock(&rmidi->open_mutex); 600 wake_up(&rmidi->open_wait); 601} 602 603/* called from sound/core/seq/seq_midi.c */ 604int snd_rawmidi_kernel_release(struct snd_rawmidi_file *rfile) 605{ 606 struct snd_rawmidi *rmidi; 607 608 if (snd_BUG_ON(!rfile)) 609 return -ENXIO; 610 611 rmidi = rfile->rmidi; 612 rawmidi_release_priv(rfile); 613 module_put(rmidi->card->module); 614 return 0; 615} 616EXPORT_SYMBOL(snd_rawmidi_kernel_release); 617 618static int snd_rawmidi_release(struct inode *inode, struct file *file) 619{ 620 struct snd_rawmidi_file *rfile; 621 struct snd_rawmidi *rmidi; 622 struct module *module; 623 624 rfile = file->private_data; 625 rmidi = rfile->rmidi; 626 rawmidi_release_priv(rfile); 627 kfree(rfile); 628 module = rmidi->card->module; 629 snd_card_file_remove(rmidi->card, file); 630 module_put(module); 631 return 0; 632} 633 634static int snd_rawmidi_info(struct snd_rawmidi_substream *substream, 635 struct snd_rawmidi_info *info) 636{ 637 struct snd_rawmidi *rmidi; 638 639 if (substream == NULL) 640 return -ENODEV; 641 rmidi = substream->rmidi; 642 memset(info, 0, sizeof(*info)); 643 info->card = rmidi->card->number; 644 info->device = rmidi->device; 645 info->subdevice = substream->number; 646 info->stream = substream->stream; 647 info->flags = rmidi->info_flags; 648 strcpy(info->id, rmidi->id); 649 strcpy(info->name, rmidi->name); 650 strcpy(info->subname, substream->name); 651 info->subdevices_count = substream->pstr->substream_count; 652 info->subdevices_avail = (substream->pstr->substream_count - 653 substream->pstr->substream_opened); 654 return 0; 655} 656 657static int snd_rawmidi_info_user(struct snd_rawmidi_substream *substream, 658 struct snd_rawmidi_info __user *_info) 659{ 660 struct snd_rawmidi_info info; 661 int err; 662 663 err = snd_rawmidi_info(substream, &info); 664 if (err < 0) 665 return err; 666 if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info))) 667 return -EFAULT; 668 return 0; 669} 670 671static int __snd_rawmidi_info_select(struct snd_card *card, 672 struct snd_rawmidi_info *info) 673{ 674 struct snd_rawmidi *rmidi; 675 struct snd_rawmidi_str *pstr; 676 struct snd_rawmidi_substream *substream; 677 678 rmidi = snd_rawmidi_search(card, info->device); 679 if (!rmidi) 680 return -ENXIO; 681 if (info->stream < 0 || info->stream > 1) 682 return -EINVAL; 683 info->stream = array_index_nospec(info->stream, 2); 684 pstr = &rmidi->streams[info->stream]; 685 if (pstr->substream_count == 0) 686 return -ENOENT; 687 if (info->subdevice >= pstr->substream_count) 688 return -ENXIO; 689 list_for_each_entry(substream, &pstr->substreams, list) { 690 if ((unsigned int)substream->number == info->subdevice) 691 return snd_rawmidi_info(substream, info); 692 } 693 return -ENXIO; 694} 695 696int snd_rawmidi_info_select(struct snd_card *card, struct snd_rawmidi_info *info) 697{ 698 int ret; 699 700 mutex_lock(®ister_mutex); 701 ret = __snd_rawmidi_info_select(card, info); 702 mutex_unlock(®ister_mutex); 703 return ret; 704} 705EXPORT_SYMBOL(snd_rawmidi_info_select); 706 707static int snd_rawmidi_info_select_user(struct snd_card *card, 708 struct snd_rawmidi_info __user *_info) 709{ 710 int err; 711 struct snd_rawmidi_info info; 712 713 if (get_user(info.device, &_info->device)) 714 return -EFAULT; 715 if (get_user(info.stream, &_info->stream)) 716 return -EFAULT; 717 if (get_user(info.subdevice, &_info->subdevice)) 718 return -EFAULT; 719 err = snd_rawmidi_info_select(card, &info); 720 if (err < 0) 721 return err; 722 if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info))) 723 return -EFAULT; 724 return 0; 725} 726 727static int resize_runtime_buffer(struct snd_rawmidi_substream *substream, 728 struct snd_rawmidi_params *params, 729 bool is_input) 730{ 731 struct snd_rawmidi_runtime *runtime = substream->runtime; 732 char *newbuf, *oldbuf; 733 unsigned int framing = params->mode & SNDRV_RAWMIDI_MODE_FRAMING_MASK; 734 735 if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L) 736 return -EINVAL; 737 if (framing == SNDRV_RAWMIDI_MODE_FRAMING_TSTAMP && (params->buffer_size & 0x1f) != 0) 738 return -EINVAL; 739 if (params->avail_min < 1 || params->avail_min > params->buffer_size) 740 return -EINVAL; 741 if (params->buffer_size & get_align(runtime)) 742 return -EINVAL; 743 if (params->buffer_size != runtime->buffer_size) { 744 newbuf = kvzalloc(params->buffer_size, GFP_KERNEL); 745 if (!newbuf) 746 return -ENOMEM; 747 spin_lock_irq(&substream->lock); 748 if (runtime->buffer_ref) { 749 spin_unlock_irq(&substream->lock); 750 kvfree(newbuf); 751 return -EBUSY; 752 } 753 oldbuf = runtime->buffer; 754 runtime->buffer = newbuf; 755 runtime->buffer_size = params->buffer_size; 756 __reset_runtime_ptrs(runtime, is_input); 757 spin_unlock_irq(&substream->lock); 758 kvfree(oldbuf); 759 } 760 runtime->avail_min = params->avail_min; 761 return 0; 762} 763 764int snd_rawmidi_output_params(struct snd_rawmidi_substream *substream, 765 struct snd_rawmidi_params *params) 766{ 767 int err; 768 769 snd_rawmidi_drain_output(substream); 770 mutex_lock(&substream->rmidi->open_mutex); 771 if (substream->append && substream->use_count > 1) 772 err = -EBUSY; 773 else 774 err = resize_runtime_buffer(substream, params, false); 775 776 if (!err) 777 substream->active_sensing = !params->no_active_sensing; 778 mutex_unlock(&substream->rmidi->open_mutex); 779 return err; 780} 781EXPORT_SYMBOL(snd_rawmidi_output_params); 782 783int snd_rawmidi_input_params(struct snd_rawmidi_substream *substream, 784 struct snd_rawmidi_params *params) 785{ 786 unsigned int framing = params->mode & SNDRV_RAWMIDI_MODE_FRAMING_MASK; 787 unsigned int clock_type = params->mode & SNDRV_RAWMIDI_MODE_CLOCK_MASK; 788 int err; 789 790 snd_rawmidi_drain_input(substream); 791 mutex_lock(&substream->rmidi->open_mutex); 792 if (framing == SNDRV_RAWMIDI_MODE_FRAMING_NONE && clock_type != SNDRV_RAWMIDI_MODE_CLOCK_NONE) 793 err = -EINVAL; 794 else if (clock_type > SNDRV_RAWMIDI_MODE_CLOCK_MONOTONIC_RAW) 795 err = -EINVAL; 796 else if (framing > SNDRV_RAWMIDI_MODE_FRAMING_TSTAMP) 797 err = -EINVAL; 798 else 799 err = resize_runtime_buffer(substream, params, true); 800 801 if (!err) { 802 substream->framing = framing; 803 substream->clock_type = clock_type; 804 } 805 mutex_unlock(&substream->rmidi->open_mutex); 806 return 0; 807} 808EXPORT_SYMBOL(snd_rawmidi_input_params); 809 810static int snd_rawmidi_output_status(struct snd_rawmidi_substream *substream, 811 struct snd_rawmidi_status64 *status) 812{ 813 struct snd_rawmidi_runtime *runtime = substream->runtime; 814 815 memset(status, 0, sizeof(*status)); 816 status->stream = SNDRV_RAWMIDI_STREAM_OUTPUT; 817 spin_lock_irq(&substream->lock); 818 status->avail = runtime->avail; 819 spin_unlock_irq(&substream->lock); 820 return 0; 821} 822 823static int snd_rawmidi_input_status(struct snd_rawmidi_substream *substream, 824 struct snd_rawmidi_status64 *status) 825{ 826 struct snd_rawmidi_runtime *runtime = substream->runtime; 827 828 memset(status, 0, sizeof(*status)); 829 status->stream = SNDRV_RAWMIDI_STREAM_INPUT; 830 spin_lock_irq(&substream->lock); 831 status->avail = runtime->avail; 832 status->xruns = runtime->xruns; 833 runtime->xruns = 0; 834 spin_unlock_irq(&substream->lock); 835 return 0; 836} 837 838static int snd_rawmidi_ioctl_status32(struct snd_rawmidi_file *rfile, 839 struct snd_rawmidi_status32 __user *argp) 840{ 841 int err = 0; 842 struct snd_rawmidi_status32 __user *status = argp; 843 struct snd_rawmidi_status32 status32; 844 struct snd_rawmidi_status64 status64; 845 846 if (copy_from_user(&status32, argp, 847 sizeof(struct snd_rawmidi_status32))) 848 return -EFAULT; 849 850 switch (status32.stream) { 851 case SNDRV_RAWMIDI_STREAM_OUTPUT: 852 if (rfile->output == NULL) 853 return -EINVAL; 854 err = snd_rawmidi_output_status(rfile->output, &status64); 855 break; 856 case SNDRV_RAWMIDI_STREAM_INPUT: 857 if (rfile->input == NULL) 858 return -EINVAL; 859 err = snd_rawmidi_input_status(rfile->input, &status64); 860 break; 861 default: 862 return -EINVAL; 863 } 864 if (err < 0) 865 return err; 866 867 status32 = (struct snd_rawmidi_status32) { 868 .stream = status64.stream, 869 .tstamp_sec = status64.tstamp_sec, 870 .tstamp_nsec = status64.tstamp_nsec, 871 .avail = status64.avail, 872 .xruns = status64.xruns, 873 }; 874 875 if (copy_to_user(status, &status32, sizeof(*status))) 876 return -EFAULT; 877 878 return 0; 879} 880 881static int snd_rawmidi_ioctl_status64(struct snd_rawmidi_file *rfile, 882 struct snd_rawmidi_status64 __user *argp) 883{ 884 int err = 0; 885 struct snd_rawmidi_status64 status; 886 887 if (copy_from_user(&status, argp, sizeof(struct snd_rawmidi_status64))) 888 return -EFAULT; 889 890 switch (status.stream) { 891 case SNDRV_RAWMIDI_STREAM_OUTPUT: 892 if (rfile->output == NULL) 893 return -EINVAL; 894 err = snd_rawmidi_output_status(rfile->output, &status); 895 break; 896 case SNDRV_RAWMIDI_STREAM_INPUT: 897 if (rfile->input == NULL) 898 return -EINVAL; 899 err = snd_rawmidi_input_status(rfile->input, &status); 900 break; 901 default: 902 return -EINVAL; 903 } 904 if (err < 0) 905 return err; 906 if (copy_to_user(argp, &status, 907 sizeof(struct snd_rawmidi_status64))) 908 return -EFAULT; 909 return 0; 910} 911 912static long snd_rawmidi_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 913{ 914 struct snd_rawmidi_file *rfile; 915 struct snd_rawmidi *rmidi; 916 void __user *argp = (void __user *)arg; 917 918 rfile = file->private_data; 919 if (((cmd >> 8) & 0xff) != 'W') 920 return -ENOTTY; 921 switch (cmd) { 922 case SNDRV_RAWMIDI_IOCTL_PVERSION: 923 return put_user(SNDRV_RAWMIDI_VERSION, (int __user *)argp) ? -EFAULT : 0; 924 case SNDRV_RAWMIDI_IOCTL_INFO: 925 { 926 int stream; 927 struct snd_rawmidi_info __user *info = argp; 928 929 if (get_user(stream, &info->stream)) 930 return -EFAULT; 931 switch (stream) { 932 case SNDRV_RAWMIDI_STREAM_INPUT: 933 return snd_rawmidi_info_user(rfile->input, info); 934 case SNDRV_RAWMIDI_STREAM_OUTPUT: 935 return snd_rawmidi_info_user(rfile->output, info); 936 default: 937 return -EINVAL; 938 } 939 } 940 case SNDRV_RAWMIDI_IOCTL_USER_PVERSION: 941 if (get_user(rfile->user_pversion, (unsigned int __user *)arg)) 942 return -EFAULT; 943 return 0; 944 945 case SNDRV_RAWMIDI_IOCTL_PARAMS: 946 { 947 struct snd_rawmidi_params params; 948 949 if (copy_from_user(¶ms, argp, sizeof(struct snd_rawmidi_params))) 950 return -EFAULT; 951 if (rfile->user_pversion < SNDRV_PROTOCOL_VERSION(2, 0, 2)) { 952 params.mode = 0; 953 memset(params.reserved, 0, sizeof(params.reserved)); 954 } 955 switch (params.stream) { 956 case SNDRV_RAWMIDI_STREAM_OUTPUT: 957 if (rfile->output == NULL) 958 return -EINVAL; 959 return snd_rawmidi_output_params(rfile->output, ¶ms); 960 case SNDRV_RAWMIDI_STREAM_INPUT: 961 if (rfile->input == NULL) 962 return -EINVAL; 963 return snd_rawmidi_input_params(rfile->input, ¶ms); 964 default: 965 return -EINVAL; 966 } 967 } 968 case SNDRV_RAWMIDI_IOCTL_STATUS32: 969 return snd_rawmidi_ioctl_status32(rfile, argp); 970 case SNDRV_RAWMIDI_IOCTL_STATUS64: 971 return snd_rawmidi_ioctl_status64(rfile, argp); 972 case SNDRV_RAWMIDI_IOCTL_DROP: 973 { 974 int val; 975 976 if (get_user(val, (int __user *) argp)) 977 return -EFAULT; 978 switch (val) { 979 case SNDRV_RAWMIDI_STREAM_OUTPUT: 980 if (rfile->output == NULL) 981 return -EINVAL; 982 return snd_rawmidi_drop_output(rfile->output); 983 default: 984 return -EINVAL; 985 } 986 } 987 case SNDRV_RAWMIDI_IOCTL_DRAIN: 988 { 989 int val; 990 991 if (get_user(val, (int __user *) argp)) 992 return -EFAULT; 993 switch (val) { 994 case SNDRV_RAWMIDI_STREAM_OUTPUT: 995 if (rfile->output == NULL) 996 return -EINVAL; 997 return snd_rawmidi_drain_output(rfile->output); 998 case SNDRV_RAWMIDI_STREAM_INPUT: 999 if (rfile->input == NULL) 1000 return -EINVAL; 1001 return snd_rawmidi_drain_input(rfile->input); 1002 default: 1003 return -EINVAL; 1004 } 1005 } 1006 default: 1007 rmidi = rfile->rmidi; 1008 if (rmidi->ops && rmidi->ops->ioctl) 1009 return rmidi->ops->ioctl(rmidi, cmd, argp); 1010 rmidi_dbg(rmidi, "rawmidi: unknown command = 0x%x\n", cmd); 1011 } 1012 return -ENOTTY; 1013} 1014 1015/* ioctl to find the next device; either legacy or UMP depending on @find_ump */ 1016static int snd_rawmidi_next_device(struct snd_card *card, int __user *argp, 1017 bool find_ump) 1018 1019{ 1020 struct snd_rawmidi *rmidi; 1021 int device; 1022 bool is_ump; 1023 1024 if (get_user(device, argp)) 1025 return -EFAULT; 1026 if (device >= SNDRV_RAWMIDI_DEVICES) /* next device is -1 */ 1027 device = SNDRV_RAWMIDI_DEVICES - 1; 1028 mutex_lock(®ister_mutex); 1029 device = device < 0 ? 0 : device + 1; 1030 for (; device < SNDRV_RAWMIDI_DEVICES; device++) { 1031 rmidi = snd_rawmidi_search(card, device); 1032 if (!rmidi) 1033 continue; 1034 is_ump = rawmidi_is_ump(rmidi); 1035 if (find_ump == is_ump) 1036 break; 1037 } 1038 if (device == SNDRV_RAWMIDI_DEVICES) 1039 device = -1; 1040 mutex_unlock(®ister_mutex); 1041 if (put_user(device, argp)) 1042 return -EFAULT; 1043 return 0; 1044} 1045 1046#if IS_ENABLED(CONFIG_SND_UMP) 1047/* inquiry of UMP endpoint and block info via control API */ 1048static int snd_rawmidi_call_ump_ioctl(struct snd_card *card, int cmd, 1049 void __user *argp) 1050{ 1051 struct snd_ump_endpoint_info __user *info = argp; 1052 struct snd_rawmidi *rmidi; 1053 int device, ret; 1054 1055 if (get_user(device, &info->device)) 1056 return -EFAULT; 1057 mutex_lock(®ister_mutex); 1058 rmidi = snd_rawmidi_search(card, device); 1059 if (rmidi && rmidi->ops && rmidi->ops->ioctl) 1060 ret = rmidi->ops->ioctl(rmidi, cmd, argp); 1061 else 1062 ret = -ENXIO; 1063 mutex_unlock(®ister_mutex); 1064 return ret; 1065} 1066#endif 1067 1068static int snd_rawmidi_control_ioctl(struct snd_card *card, 1069 struct snd_ctl_file *control, 1070 unsigned int cmd, 1071 unsigned long arg) 1072{ 1073 void __user *argp = (void __user *)arg; 1074 1075 switch (cmd) { 1076 case SNDRV_CTL_IOCTL_RAWMIDI_NEXT_DEVICE: 1077 return snd_rawmidi_next_device(card, argp, false); 1078#if IS_ENABLED(CONFIG_SND_UMP) 1079 case SNDRV_CTL_IOCTL_UMP_NEXT_DEVICE: 1080 return snd_rawmidi_next_device(card, argp, true); 1081 case SNDRV_CTL_IOCTL_UMP_ENDPOINT_INFO: 1082 return snd_rawmidi_call_ump_ioctl(card, SNDRV_UMP_IOCTL_ENDPOINT_INFO, argp); 1083 case SNDRV_CTL_IOCTL_UMP_BLOCK_INFO: 1084 return snd_rawmidi_call_ump_ioctl(card, SNDRV_UMP_IOCTL_BLOCK_INFO, argp); 1085#endif 1086 case SNDRV_CTL_IOCTL_RAWMIDI_PREFER_SUBDEVICE: 1087 { 1088 int val; 1089 1090 if (get_user(val, (int __user *)argp)) 1091 return -EFAULT; 1092 control->preferred_subdevice[SND_CTL_SUBDEV_RAWMIDI] = val; 1093 return 0; 1094 } 1095 case SNDRV_CTL_IOCTL_RAWMIDI_INFO: 1096 return snd_rawmidi_info_select_user(card, argp); 1097 } 1098 return -ENOIOCTLCMD; 1099} 1100 1101static int receive_with_tstamp_framing(struct snd_rawmidi_substream *substream, 1102 const unsigned char *buffer, int src_count, const struct timespec64 *tstamp) 1103{ 1104 struct snd_rawmidi_runtime *runtime = substream->runtime; 1105 struct snd_rawmidi_framing_tstamp *dest_ptr; 1106 struct snd_rawmidi_framing_tstamp frame = { .tv_sec = tstamp->tv_sec, .tv_nsec = tstamp->tv_nsec }; 1107 int orig_count = src_count; 1108 int frame_size = sizeof(struct snd_rawmidi_framing_tstamp); 1109 int align = get_align(runtime); 1110 1111 BUILD_BUG_ON(frame_size != 0x20); 1112 if (snd_BUG_ON((runtime->hw_ptr & 0x1f) != 0)) 1113 return -EINVAL; 1114 1115 while (src_count > align) { 1116 if ((int)(runtime->buffer_size - runtime->avail) < frame_size) { 1117 runtime->xruns += src_count; 1118 break; 1119 } 1120 if (src_count >= SNDRV_RAWMIDI_FRAMING_DATA_LENGTH) 1121 frame.length = SNDRV_RAWMIDI_FRAMING_DATA_LENGTH; 1122 else { 1123 frame.length = get_aligned_size(runtime, src_count); 1124 if (!frame.length) 1125 break; 1126 memset(frame.data, 0, SNDRV_RAWMIDI_FRAMING_DATA_LENGTH); 1127 } 1128 memcpy(frame.data, buffer, frame.length); 1129 buffer += frame.length; 1130 src_count -= frame.length; 1131 dest_ptr = (struct snd_rawmidi_framing_tstamp *) (runtime->buffer + runtime->hw_ptr); 1132 *dest_ptr = frame; 1133 runtime->avail += frame_size; 1134 runtime->hw_ptr += frame_size; 1135 runtime->hw_ptr %= runtime->buffer_size; 1136 } 1137 return orig_count - src_count; 1138} 1139 1140static struct timespec64 get_framing_tstamp(struct snd_rawmidi_substream *substream) 1141{ 1142 struct timespec64 ts64 = {0, 0}; 1143 1144 switch (substream->clock_type) { 1145 case SNDRV_RAWMIDI_MODE_CLOCK_MONOTONIC_RAW: 1146 ktime_get_raw_ts64(&ts64); 1147 break; 1148 case SNDRV_RAWMIDI_MODE_CLOCK_MONOTONIC: 1149 ktime_get_ts64(&ts64); 1150 break; 1151 case SNDRV_RAWMIDI_MODE_CLOCK_REALTIME: 1152 ktime_get_real_ts64(&ts64); 1153 break; 1154 } 1155 return ts64; 1156} 1157 1158/** 1159 * snd_rawmidi_receive - receive the input data from the device 1160 * @substream: the rawmidi substream 1161 * @buffer: the buffer pointer 1162 * @count: the data size to read 1163 * 1164 * Reads the data from the internal buffer. 1165 * 1166 * Return: The size of read data, or a negative error code on failure. 1167 */ 1168int snd_rawmidi_receive(struct snd_rawmidi_substream *substream, 1169 const unsigned char *buffer, int count) 1170{ 1171 unsigned long flags; 1172 struct timespec64 ts64 = get_framing_tstamp(substream); 1173 int result = 0, count1; 1174 struct snd_rawmidi_runtime *runtime; 1175 1176 spin_lock_irqsave(&substream->lock, flags); 1177 if (!substream->opened) { 1178 result = -EBADFD; 1179 goto unlock; 1180 } 1181 runtime = substream->runtime; 1182 if (!runtime || !runtime->buffer) { 1183 rmidi_dbg(substream->rmidi, 1184 "snd_rawmidi_receive: input is not active!!!\n"); 1185 result = -EINVAL; 1186 goto unlock; 1187 } 1188 1189 count = get_aligned_size(runtime, count); 1190 if (!count) 1191 goto unlock; 1192 1193 if (substream->framing == SNDRV_RAWMIDI_MODE_FRAMING_TSTAMP) { 1194 result = receive_with_tstamp_framing(substream, buffer, count, &ts64); 1195 } else if (count == 1) { /* special case, faster code */ 1196 substream->bytes++; 1197 if (runtime->avail < runtime->buffer_size) { 1198 runtime->buffer[runtime->hw_ptr++] = buffer[0]; 1199 runtime->hw_ptr %= runtime->buffer_size; 1200 runtime->avail++; 1201 result++; 1202 } else { 1203 runtime->xruns++; 1204 } 1205 } else { 1206 substream->bytes += count; 1207 count1 = runtime->buffer_size - runtime->hw_ptr; 1208 if (count1 > count) 1209 count1 = count; 1210 if (count1 > (int)(runtime->buffer_size - runtime->avail)) 1211 count1 = runtime->buffer_size - runtime->avail; 1212 count1 = get_aligned_size(runtime, count1); 1213 if (!count1) 1214 goto unlock; 1215 memcpy(runtime->buffer + runtime->hw_ptr, buffer, count1); 1216 runtime->hw_ptr += count1; 1217 runtime->hw_ptr %= runtime->buffer_size; 1218 runtime->avail += count1; 1219 count -= count1; 1220 result += count1; 1221 if (count > 0) { 1222 buffer += count1; 1223 count1 = count; 1224 if (count1 > (int)(runtime->buffer_size - runtime->avail)) { 1225 count1 = runtime->buffer_size - runtime->avail; 1226 runtime->xruns += count - count1; 1227 } 1228 if (count1 > 0) { 1229 memcpy(runtime->buffer, buffer, count1); 1230 runtime->hw_ptr = count1; 1231 runtime->avail += count1; 1232 result += count1; 1233 } 1234 } 1235 } 1236 if (result > 0) { 1237 if (runtime->event) 1238 schedule_work(&runtime->event_work); 1239 else if (__snd_rawmidi_ready(runtime)) 1240 wake_up(&runtime->sleep); 1241 } 1242 unlock: 1243 spin_unlock_irqrestore(&substream->lock, flags); 1244 return result; 1245} 1246EXPORT_SYMBOL(snd_rawmidi_receive); 1247 1248static long snd_rawmidi_kernel_read1(struct snd_rawmidi_substream *substream, 1249 unsigned char __user *userbuf, 1250 unsigned char *kernelbuf, long count) 1251{ 1252 unsigned long flags; 1253 long result = 0, count1; 1254 struct snd_rawmidi_runtime *runtime = substream->runtime; 1255 unsigned long appl_ptr; 1256 int err = 0; 1257 1258 spin_lock_irqsave(&substream->lock, flags); 1259 snd_rawmidi_buffer_ref(runtime); 1260 while (count > 0 && runtime->avail) { 1261 count1 = runtime->buffer_size - runtime->appl_ptr; 1262 if (count1 > count) 1263 count1 = count; 1264 if (count1 > (int)runtime->avail) 1265 count1 = runtime->avail; 1266 1267 /* update runtime->appl_ptr before unlocking for userbuf */ 1268 appl_ptr = runtime->appl_ptr; 1269 runtime->appl_ptr += count1; 1270 runtime->appl_ptr %= runtime->buffer_size; 1271 runtime->avail -= count1; 1272 1273 if (kernelbuf) 1274 memcpy(kernelbuf + result, runtime->buffer + appl_ptr, count1); 1275 if (userbuf) { 1276 spin_unlock_irqrestore(&substream->lock, flags); 1277 if (copy_to_user(userbuf + result, 1278 runtime->buffer + appl_ptr, count1)) 1279 err = -EFAULT; 1280 spin_lock_irqsave(&substream->lock, flags); 1281 if (err) 1282 goto out; 1283 } 1284 result += count1; 1285 count -= count1; 1286 } 1287 out: 1288 snd_rawmidi_buffer_unref(runtime); 1289 spin_unlock_irqrestore(&substream->lock, flags); 1290 return result > 0 ? result : err; 1291} 1292 1293long snd_rawmidi_kernel_read(struct snd_rawmidi_substream *substream, 1294 unsigned char *buf, long count) 1295{ 1296 snd_rawmidi_input_trigger(substream, 1); 1297 return snd_rawmidi_kernel_read1(substream, NULL/*userbuf*/, buf, count); 1298} 1299EXPORT_SYMBOL(snd_rawmidi_kernel_read); 1300 1301static ssize_t snd_rawmidi_read(struct file *file, char __user *buf, size_t count, 1302 loff_t *offset) 1303{ 1304 long result; 1305 int count1; 1306 struct snd_rawmidi_file *rfile; 1307 struct snd_rawmidi_substream *substream; 1308 struct snd_rawmidi_runtime *runtime; 1309 1310 rfile = file->private_data; 1311 substream = rfile->input; 1312 if (substream == NULL) 1313 return -EIO; 1314 runtime = substream->runtime; 1315 snd_rawmidi_input_trigger(substream, 1); 1316 result = 0; 1317 while (count > 0) { 1318 spin_lock_irq(&substream->lock); 1319 while (!__snd_rawmidi_ready(runtime)) { 1320 wait_queue_entry_t wait; 1321 1322 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) { 1323 spin_unlock_irq(&substream->lock); 1324 return result > 0 ? result : -EAGAIN; 1325 } 1326 init_waitqueue_entry(&wait, current); 1327 add_wait_queue(&runtime->sleep, &wait); 1328 set_current_state(TASK_INTERRUPTIBLE); 1329 spin_unlock_irq(&substream->lock); 1330 schedule(); 1331 remove_wait_queue(&runtime->sleep, &wait); 1332 if (rfile->rmidi->card->shutdown) 1333 return -ENODEV; 1334 if (signal_pending(current)) 1335 return result > 0 ? result : -ERESTARTSYS; 1336 spin_lock_irq(&substream->lock); 1337 if (!runtime->avail) { 1338 spin_unlock_irq(&substream->lock); 1339 return result > 0 ? result : -EIO; 1340 } 1341 } 1342 spin_unlock_irq(&substream->lock); 1343 count1 = snd_rawmidi_kernel_read1(substream, 1344 (unsigned char __user *)buf, 1345 NULL/*kernelbuf*/, 1346 count); 1347 if (count1 < 0) 1348 return result > 0 ? result : count1; 1349 result += count1; 1350 buf += count1; 1351 count -= count1; 1352 } 1353 return result; 1354} 1355 1356/** 1357 * snd_rawmidi_transmit_empty - check whether the output buffer is empty 1358 * @substream: the rawmidi substream 1359 * 1360 * Return: 1 if the internal output buffer is empty, 0 if not. 1361 */ 1362int snd_rawmidi_transmit_empty(struct snd_rawmidi_substream *substream) 1363{ 1364 struct snd_rawmidi_runtime *runtime; 1365 int result; 1366 unsigned long flags; 1367 1368 spin_lock_irqsave(&substream->lock, flags); 1369 runtime = substream->runtime; 1370 if (!substream->opened || !runtime || !runtime->buffer) { 1371 rmidi_dbg(substream->rmidi, 1372 "snd_rawmidi_transmit_empty: output is not active!!!\n"); 1373 result = 1; 1374 } else { 1375 result = runtime->avail >= runtime->buffer_size; 1376 } 1377 spin_unlock_irqrestore(&substream->lock, flags); 1378 return result; 1379} 1380EXPORT_SYMBOL(snd_rawmidi_transmit_empty); 1381 1382/* 1383 * __snd_rawmidi_transmit_peek - copy data from the internal buffer 1384 * @substream: the rawmidi substream 1385 * @buffer: the buffer pointer 1386 * @count: data size to transfer 1387 * 1388 * This is a variant of snd_rawmidi_transmit_peek() without spinlock. 1389 */ 1390static int __snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream, 1391 unsigned char *buffer, int count) 1392{ 1393 int result, count1; 1394 struct snd_rawmidi_runtime *runtime = substream->runtime; 1395 1396 if (runtime->buffer == NULL) { 1397 rmidi_dbg(substream->rmidi, 1398 "snd_rawmidi_transmit_peek: output is not active!!!\n"); 1399 return -EINVAL; 1400 } 1401 result = 0; 1402 if (runtime->avail >= runtime->buffer_size) { 1403 /* warning: lowlevel layer MUST trigger down the hardware */ 1404 goto __skip; 1405 } 1406 if (count == 1) { /* special case, faster code */ 1407 *buffer = runtime->buffer[runtime->hw_ptr]; 1408 result++; 1409 } else { 1410 count1 = runtime->buffer_size - runtime->hw_ptr; 1411 if (count1 > count) 1412 count1 = count; 1413 if (count1 > (int)(runtime->buffer_size - runtime->avail)) 1414 count1 = runtime->buffer_size - runtime->avail; 1415 count1 = get_aligned_size(runtime, count1); 1416 if (!count1) 1417 goto __skip; 1418 memcpy(buffer, runtime->buffer + runtime->hw_ptr, count1); 1419 count -= count1; 1420 result += count1; 1421 if (count > 0) { 1422 if (count > (int)(runtime->buffer_size - runtime->avail - count1)) 1423 count = runtime->buffer_size - runtime->avail - count1; 1424 count = get_aligned_size(runtime, count); 1425 if (!count) 1426 goto __skip; 1427 memcpy(buffer + count1, runtime->buffer, count); 1428 result += count; 1429 } 1430 } 1431 __skip: 1432 return result; 1433} 1434 1435/** 1436 * snd_rawmidi_transmit_peek - copy data from the internal buffer 1437 * @substream: the rawmidi substream 1438 * @buffer: the buffer pointer 1439 * @count: data size to transfer 1440 * 1441 * Copies data from the internal output buffer to the given buffer. 1442 * 1443 * Call this in the interrupt handler when the midi output is ready, 1444 * and call snd_rawmidi_transmit_ack() after the transmission is 1445 * finished. 1446 * 1447 * Return: The size of copied data, or a negative error code on failure. 1448 */ 1449int snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream, 1450 unsigned char *buffer, int count) 1451{ 1452 int result; 1453 unsigned long flags; 1454 1455 spin_lock_irqsave(&substream->lock, flags); 1456 if (!substream->opened || !substream->runtime) 1457 result = -EBADFD; 1458 else 1459 result = __snd_rawmidi_transmit_peek(substream, buffer, count); 1460 spin_unlock_irqrestore(&substream->lock, flags); 1461 return result; 1462} 1463EXPORT_SYMBOL(snd_rawmidi_transmit_peek); 1464 1465/* 1466 * __snd_rawmidi_transmit_ack - acknowledge the transmission 1467 * @substream: the rawmidi substream 1468 * @count: the transferred count 1469 * 1470 * This is a variant of __snd_rawmidi_transmit_ack() without spinlock. 1471 */ 1472static int __snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, 1473 int count) 1474{ 1475 struct snd_rawmidi_runtime *runtime = substream->runtime; 1476 1477 if (runtime->buffer == NULL) { 1478 rmidi_dbg(substream->rmidi, 1479 "snd_rawmidi_transmit_ack: output is not active!!!\n"); 1480 return -EINVAL; 1481 } 1482 snd_BUG_ON(runtime->avail + count > runtime->buffer_size); 1483 count = get_aligned_size(runtime, count); 1484 runtime->hw_ptr += count; 1485 runtime->hw_ptr %= runtime->buffer_size; 1486 runtime->avail += count; 1487 substream->bytes += count; 1488 if (count > 0) { 1489 if (runtime->drain || __snd_rawmidi_ready(runtime)) 1490 wake_up(&runtime->sleep); 1491 } 1492 return count; 1493} 1494 1495/** 1496 * snd_rawmidi_transmit_ack - acknowledge the transmission 1497 * @substream: the rawmidi substream 1498 * @count: the transferred count 1499 * 1500 * Advances the hardware pointer for the internal output buffer with 1501 * the given size and updates the condition. 1502 * Call after the transmission is finished. 1503 * 1504 * Return: The advanced size if successful, or a negative error code on failure. 1505 */ 1506int snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count) 1507{ 1508 int result; 1509 unsigned long flags; 1510 1511 spin_lock_irqsave(&substream->lock, flags); 1512 if (!substream->opened || !substream->runtime) 1513 result = -EBADFD; 1514 else 1515 result = __snd_rawmidi_transmit_ack(substream, count); 1516 spin_unlock_irqrestore(&substream->lock, flags); 1517 return result; 1518} 1519EXPORT_SYMBOL(snd_rawmidi_transmit_ack); 1520 1521/** 1522 * snd_rawmidi_transmit - copy from the buffer to the device 1523 * @substream: the rawmidi substream 1524 * @buffer: the buffer pointer 1525 * @count: the data size to transfer 1526 * 1527 * Copies data from the buffer to the device and advances the pointer. 1528 * 1529 * Return: The copied size if successful, or a negative error code on failure. 1530 */ 1531int snd_rawmidi_transmit(struct snd_rawmidi_substream *substream, 1532 unsigned char *buffer, int count) 1533{ 1534 int result; 1535 unsigned long flags; 1536 1537 spin_lock_irqsave(&substream->lock, flags); 1538 if (!substream->opened) 1539 result = -EBADFD; 1540 else { 1541 count = __snd_rawmidi_transmit_peek(substream, buffer, count); 1542 if (count <= 0) 1543 result = count; 1544 else 1545 result = __snd_rawmidi_transmit_ack(substream, count); 1546 } 1547 spin_unlock_irqrestore(&substream->lock, flags); 1548 return result; 1549} 1550EXPORT_SYMBOL(snd_rawmidi_transmit); 1551 1552/** 1553 * snd_rawmidi_proceed - Discard the all pending bytes and proceed 1554 * @substream: rawmidi substream 1555 * 1556 * Return: the number of discarded bytes 1557 */ 1558int snd_rawmidi_proceed(struct snd_rawmidi_substream *substream) 1559{ 1560 struct snd_rawmidi_runtime *runtime; 1561 unsigned long flags; 1562 int count = 0; 1563 1564 spin_lock_irqsave(&substream->lock, flags); 1565 runtime = substream->runtime; 1566 if (substream->opened && runtime && 1567 runtime->avail < runtime->buffer_size) { 1568 count = runtime->buffer_size - runtime->avail; 1569 __snd_rawmidi_transmit_ack(substream, count); 1570 } 1571 spin_unlock_irqrestore(&substream->lock, flags); 1572 return count; 1573} 1574EXPORT_SYMBOL(snd_rawmidi_proceed); 1575 1576static long snd_rawmidi_kernel_write1(struct snd_rawmidi_substream *substream, 1577 const unsigned char __user *userbuf, 1578 const unsigned char *kernelbuf, 1579 long count) 1580{ 1581 unsigned long flags; 1582 long count1, result; 1583 struct snd_rawmidi_runtime *runtime = substream->runtime; 1584 unsigned long appl_ptr; 1585 1586 if (!kernelbuf && !userbuf) 1587 return -EINVAL; 1588 if (snd_BUG_ON(!runtime->buffer)) 1589 return -EINVAL; 1590 1591 result = 0; 1592 spin_lock_irqsave(&substream->lock, flags); 1593 if (substream->append) { 1594 if ((long)runtime->avail < count) { 1595 spin_unlock_irqrestore(&substream->lock, flags); 1596 return -EAGAIN; 1597 } 1598 } 1599 snd_rawmidi_buffer_ref(runtime); 1600 while (count > 0 && runtime->avail > 0) { 1601 count1 = runtime->buffer_size - runtime->appl_ptr; 1602 if (count1 > count) 1603 count1 = count; 1604 if (count1 > (long)runtime->avail) 1605 count1 = runtime->avail; 1606 1607 /* update runtime->appl_ptr before unlocking for userbuf */ 1608 appl_ptr = runtime->appl_ptr; 1609 runtime->appl_ptr += count1; 1610 runtime->appl_ptr %= runtime->buffer_size; 1611 runtime->avail -= count1; 1612 1613 if (kernelbuf) 1614 memcpy(runtime->buffer + appl_ptr, 1615 kernelbuf + result, count1); 1616 else if (userbuf) { 1617 spin_unlock_irqrestore(&substream->lock, flags); 1618 if (copy_from_user(runtime->buffer + appl_ptr, 1619 userbuf + result, count1)) { 1620 spin_lock_irqsave(&substream->lock, flags); 1621 result = result > 0 ? result : -EFAULT; 1622 goto __end; 1623 } 1624 spin_lock_irqsave(&substream->lock, flags); 1625 } 1626 result += count1; 1627 count -= count1; 1628 } 1629 __end: 1630 count1 = runtime->avail < runtime->buffer_size; 1631 snd_rawmidi_buffer_unref(runtime); 1632 spin_unlock_irqrestore(&substream->lock, flags); 1633 if (count1) 1634 snd_rawmidi_output_trigger(substream, 1); 1635 return result; 1636} 1637 1638long snd_rawmidi_kernel_write(struct snd_rawmidi_substream *substream, 1639 const unsigned char *buf, long count) 1640{ 1641 return snd_rawmidi_kernel_write1(substream, NULL, buf, count); 1642} 1643EXPORT_SYMBOL(snd_rawmidi_kernel_write); 1644 1645static ssize_t snd_rawmidi_write(struct file *file, const char __user *buf, 1646 size_t count, loff_t *offset) 1647{ 1648 long result, timeout; 1649 int count1; 1650 struct snd_rawmidi_file *rfile; 1651 struct snd_rawmidi_runtime *runtime; 1652 struct snd_rawmidi_substream *substream; 1653 1654 rfile = file->private_data; 1655 substream = rfile->output; 1656 runtime = substream->runtime; 1657 /* we cannot put an atomic message to our buffer */ 1658 if (substream->append && count > runtime->buffer_size) 1659 return -EIO; 1660 result = 0; 1661 while (count > 0) { 1662 spin_lock_irq(&substream->lock); 1663 while (!snd_rawmidi_ready_append(substream, count)) { 1664 wait_queue_entry_t wait; 1665 1666 if (file->f_flags & O_NONBLOCK) { 1667 spin_unlock_irq(&substream->lock); 1668 return result > 0 ? result : -EAGAIN; 1669 } 1670 init_waitqueue_entry(&wait, current); 1671 add_wait_queue(&runtime->sleep, &wait); 1672 set_current_state(TASK_INTERRUPTIBLE); 1673 spin_unlock_irq(&substream->lock); 1674 timeout = schedule_timeout(30 * HZ); 1675 remove_wait_queue(&runtime->sleep, &wait); 1676 if (rfile->rmidi->card->shutdown) 1677 return -ENODEV; 1678 if (signal_pending(current)) 1679 return result > 0 ? result : -ERESTARTSYS; 1680 spin_lock_irq(&substream->lock); 1681 if (!runtime->avail && !timeout) { 1682 spin_unlock_irq(&substream->lock); 1683 return result > 0 ? result : -EIO; 1684 } 1685 } 1686 spin_unlock_irq(&substream->lock); 1687 count1 = snd_rawmidi_kernel_write1(substream, buf, NULL, count); 1688 if (count1 < 0) 1689 return result > 0 ? result : count1; 1690 result += count1; 1691 buf += count1; 1692 if ((size_t)count1 < count && (file->f_flags & O_NONBLOCK)) 1693 break; 1694 count -= count1; 1695 } 1696 if (file->f_flags & O_DSYNC) { 1697 spin_lock_irq(&substream->lock); 1698 while (runtime->avail != runtime->buffer_size) { 1699 wait_queue_entry_t wait; 1700 unsigned int last_avail = runtime->avail; 1701 1702 init_waitqueue_entry(&wait, current); 1703 add_wait_queue(&runtime->sleep, &wait); 1704 set_current_state(TASK_INTERRUPTIBLE); 1705 spin_unlock_irq(&substream->lock); 1706 timeout = schedule_timeout(30 * HZ); 1707 remove_wait_queue(&runtime->sleep, &wait); 1708 if (signal_pending(current)) 1709 return result > 0 ? result : -ERESTARTSYS; 1710 if (runtime->avail == last_avail && !timeout) 1711 return result > 0 ? result : -EIO; 1712 spin_lock_irq(&substream->lock); 1713 } 1714 spin_unlock_irq(&substream->lock); 1715 } 1716 return result; 1717} 1718 1719static __poll_t snd_rawmidi_poll(struct file *file, poll_table *wait) 1720{ 1721 struct snd_rawmidi_file *rfile; 1722 struct snd_rawmidi_runtime *runtime; 1723 __poll_t mask; 1724 1725 rfile = file->private_data; 1726 if (rfile->input != NULL) { 1727 runtime = rfile->input->runtime; 1728 snd_rawmidi_input_trigger(rfile->input, 1); 1729 poll_wait(file, &runtime->sleep, wait); 1730 } 1731 if (rfile->output != NULL) { 1732 runtime = rfile->output->runtime; 1733 poll_wait(file, &runtime->sleep, wait); 1734 } 1735 mask = 0; 1736 if (rfile->input != NULL) { 1737 if (snd_rawmidi_ready(rfile->input)) 1738 mask |= EPOLLIN | EPOLLRDNORM; 1739 } 1740 if (rfile->output != NULL) { 1741 if (snd_rawmidi_ready(rfile->output)) 1742 mask |= EPOLLOUT | EPOLLWRNORM; 1743 } 1744 return mask; 1745} 1746 1747/* 1748 */ 1749#ifdef CONFIG_COMPAT 1750#include "rawmidi_compat.c" 1751#else 1752#define snd_rawmidi_ioctl_compat NULL 1753#endif 1754 1755/* 1756 */ 1757 1758static void snd_rawmidi_proc_info_read(struct snd_info_entry *entry, 1759 struct snd_info_buffer *buffer) 1760{ 1761 struct snd_rawmidi *rmidi; 1762 struct snd_rawmidi_substream *substream; 1763 struct snd_rawmidi_runtime *runtime; 1764 unsigned long buffer_size, avail, xruns; 1765 unsigned int clock_type; 1766 static const char *clock_names[4] = { "none", "realtime", "monotonic", "monotonic raw" }; 1767 1768 rmidi = entry->private_data; 1769 snd_iprintf(buffer, "%s\n\n", rmidi->name); 1770 if (IS_ENABLED(CONFIG_SND_UMP)) 1771 snd_iprintf(buffer, "Type: %s\n", 1772 rawmidi_is_ump(rmidi) ? "UMP" : "Legacy"); 1773 if (rmidi->ops && rmidi->ops->proc_read) 1774 rmidi->ops->proc_read(entry, buffer); 1775 mutex_lock(&rmidi->open_mutex); 1776 if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_OUTPUT) { 1777 list_for_each_entry(substream, 1778 &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams, 1779 list) { 1780 snd_iprintf(buffer, 1781 "Output %d\n" 1782 " Tx bytes : %lu\n", 1783 substream->number, 1784 (unsigned long) substream->bytes); 1785 if (substream->opened) { 1786 snd_iprintf(buffer, 1787 " Owner PID : %d\n", 1788 pid_vnr(substream->pid)); 1789 runtime = substream->runtime; 1790 spin_lock_irq(&substream->lock); 1791 buffer_size = runtime->buffer_size; 1792 avail = runtime->avail; 1793 spin_unlock_irq(&substream->lock); 1794 snd_iprintf(buffer, 1795 " Mode : %s\n" 1796 " Buffer size : %lu\n" 1797 " Avail : %lu\n", 1798 runtime->oss ? "OSS compatible" : "native", 1799 buffer_size, avail); 1800 } 1801 } 1802 } 1803 if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_INPUT) { 1804 list_for_each_entry(substream, 1805 &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams, 1806 list) { 1807 snd_iprintf(buffer, 1808 "Input %d\n" 1809 " Rx bytes : %lu\n", 1810 substream->number, 1811 (unsigned long) substream->bytes); 1812 if (substream->opened) { 1813 snd_iprintf(buffer, 1814 " Owner PID : %d\n", 1815 pid_vnr(substream->pid)); 1816 runtime = substream->runtime; 1817 spin_lock_irq(&substream->lock); 1818 buffer_size = runtime->buffer_size; 1819 avail = runtime->avail; 1820 xruns = runtime->xruns; 1821 spin_unlock_irq(&substream->lock); 1822 snd_iprintf(buffer, 1823 " Buffer size : %lu\n" 1824 " Avail : %lu\n" 1825 " Overruns : %lu\n", 1826 buffer_size, avail, xruns); 1827 if (substream->framing == SNDRV_RAWMIDI_MODE_FRAMING_TSTAMP) { 1828 clock_type = substream->clock_type >> SNDRV_RAWMIDI_MODE_CLOCK_SHIFT; 1829 if (!snd_BUG_ON(clock_type >= ARRAY_SIZE(clock_names))) 1830 snd_iprintf(buffer, 1831 " Framing : tstamp\n" 1832 " Clock type : %s\n", 1833 clock_names[clock_type]); 1834 } 1835 } 1836 } 1837 } 1838 mutex_unlock(&rmidi->open_mutex); 1839} 1840 1841/* 1842 * Register functions 1843 */ 1844 1845static const struct file_operations snd_rawmidi_f_ops = { 1846 .owner = THIS_MODULE, 1847 .read = snd_rawmidi_read, 1848 .write = snd_rawmidi_write, 1849 .open = snd_rawmidi_open, 1850 .release = snd_rawmidi_release, 1851 .llseek = no_llseek, 1852 .poll = snd_rawmidi_poll, 1853 .unlocked_ioctl = snd_rawmidi_ioctl, 1854 .compat_ioctl = snd_rawmidi_ioctl_compat, 1855}; 1856 1857static int snd_rawmidi_alloc_substreams(struct snd_rawmidi *rmidi, 1858 struct snd_rawmidi_str *stream, 1859 int direction, 1860 int count) 1861{ 1862 struct snd_rawmidi_substream *substream; 1863 int idx; 1864 1865 for (idx = 0; idx < count; idx++) { 1866 substream = kzalloc(sizeof(*substream), GFP_KERNEL); 1867 if (!substream) 1868 return -ENOMEM; 1869 substream->stream = direction; 1870 substream->number = idx; 1871 substream->rmidi = rmidi; 1872 substream->pstr = stream; 1873 spin_lock_init(&substream->lock); 1874 list_add_tail(&substream->list, &stream->substreams); 1875 stream->substream_count++; 1876 } 1877 return 0; 1878} 1879 1880/* used for both rawmidi and ump */ 1881int snd_rawmidi_init(struct snd_rawmidi *rmidi, 1882 struct snd_card *card, char *id, int device, 1883 int output_count, int input_count, 1884 unsigned int info_flags) 1885{ 1886 int err; 1887 static const struct snd_device_ops ops = { 1888 .dev_free = snd_rawmidi_dev_free, 1889 .dev_register = snd_rawmidi_dev_register, 1890 .dev_disconnect = snd_rawmidi_dev_disconnect, 1891 }; 1892 1893 rmidi->card = card; 1894 rmidi->device = device; 1895 mutex_init(&rmidi->open_mutex); 1896 init_waitqueue_head(&rmidi->open_wait); 1897 INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams); 1898 INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams); 1899 rmidi->info_flags = info_flags; 1900 1901 if (id != NULL) 1902 strscpy(rmidi->id, id, sizeof(rmidi->id)); 1903 1904 err = snd_device_alloc(&rmidi->dev, card); 1905 if (err < 0) 1906 return err; 1907 if (rawmidi_is_ump(rmidi)) 1908 dev_set_name(rmidi->dev, "umpC%iD%i", card->number, device); 1909 else 1910 dev_set_name(rmidi->dev, "midiC%iD%i", card->number, device); 1911 1912 err = snd_rawmidi_alloc_substreams(rmidi, 1913 &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT], 1914 SNDRV_RAWMIDI_STREAM_INPUT, 1915 input_count); 1916 if (err < 0) 1917 return err; 1918 err = snd_rawmidi_alloc_substreams(rmidi, 1919 &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT], 1920 SNDRV_RAWMIDI_STREAM_OUTPUT, 1921 output_count); 1922 if (err < 0) 1923 return err; 1924 err = snd_device_new(card, SNDRV_DEV_RAWMIDI, rmidi, &ops); 1925 if (err < 0) 1926 return err; 1927 return 0; 1928} 1929EXPORT_SYMBOL_GPL(snd_rawmidi_init); 1930 1931/** 1932 * snd_rawmidi_new - create a rawmidi instance 1933 * @card: the card instance 1934 * @id: the id string 1935 * @device: the device index 1936 * @output_count: the number of output streams 1937 * @input_count: the number of input streams 1938 * @rrawmidi: the pointer to store the new rawmidi instance 1939 * 1940 * Creates a new rawmidi instance. 1941 * Use snd_rawmidi_set_ops() to set the operators to the new instance. 1942 * 1943 * Return: Zero if successful, or a negative error code on failure. 1944 */ 1945int snd_rawmidi_new(struct snd_card *card, char *id, int device, 1946 int output_count, int input_count, 1947 struct snd_rawmidi **rrawmidi) 1948{ 1949 struct snd_rawmidi *rmidi; 1950 int err; 1951 1952 if (rrawmidi) 1953 *rrawmidi = NULL; 1954 rmidi = kzalloc(sizeof(*rmidi), GFP_KERNEL); 1955 if (!rmidi) 1956 return -ENOMEM; 1957 err = snd_rawmidi_init(rmidi, card, id, device, 1958 output_count, input_count, 0); 1959 if (err < 0) { 1960 snd_rawmidi_free(rmidi); 1961 return err; 1962 } 1963 if (rrawmidi) 1964 *rrawmidi = rmidi; 1965 return 0; 1966} 1967EXPORT_SYMBOL(snd_rawmidi_new); 1968 1969static void snd_rawmidi_free_substreams(struct snd_rawmidi_str *stream) 1970{ 1971 struct snd_rawmidi_substream *substream; 1972 1973 while (!list_empty(&stream->substreams)) { 1974 substream = list_entry(stream->substreams.next, struct snd_rawmidi_substream, list); 1975 list_del(&substream->list); 1976 kfree(substream); 1977 } 1978} 1979 1980/* called from ump.c, too */ 1981int snd_rawmidi_free(struct snd_rawmidi *rmidi) 1982{ 1983 if (!rmidi) 1984 return 0; 1985 1986 snd_info_free_entry(rmidi->proc_entry); 1987 rmidi->proc_entry = NULL; 1988 if (rmidi->ops && rmidi->ops->dev_unregister) 1989 rmidi->ops->dev_unregister(rmidi); 1990 1991 snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT]); 1992 snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT]); 1993 if (rmidi->private_free) 1994 rmidi->private_free(rmidi); 1995 put_device(rmidi->dev); 1996 kfree(rmidi); 1997 return 0; 1998} 1999EXPORT_SYMBOL_GPL(snd_rawmidi_free); 2000 2001static int snd_rawmidi_dev_free(struct snd_device *device) 2002{ 2003 struct snd_rawmidi *rmidi = device->device_data; 2004 2005 return snd_rawmidi_free(rmidi); 2006} 2007 2008#if IS_ENABLED(CONFIG_SND_SEQUENCER) 2009static void snd_rawmidi_dev_seq_free(struct snd_seq_device *device) 2010{ 2011 struct snd_rawmidi *rmidi = device->private_data; 2012 2013 rmidi->seq_dev = NULL; 2014} 2015#endif 2016 2017static int snd_rawmidi_dev_register(struct snd_device *device) 2018{ 2019 int err; 2020 struct snd_info_entry *entry; 2021 char name[16]; 2022 struct snd_rawmidi *rmidi = device->device_data; 2023 2024 if (rmidi->device >= SNDRV_RAWMIDI_DEVICES) 2025 return -ENOMEM; 2026 err = 0; 2027 mutex_lock(®ister_mutex); 2028 if (snd_rawmidi_search(rmidi->card, rmidi->device)) 2029 err = -EBUSY; 2030 else 2031 list_add_tail(&rmidi->list, &snd_rawmidi_devices); 2032 mutex_unlock(®ister_mutex); 2033 if (err < 0) 2034 return err; 2035 2036 err = snd_register_device(SNDRV_DEVICE_TYPE_RAWMIDI, 2037 rmidi->card, rmidi->device, 2038 &snd_rawmidi_f_ops, rmidi, rmidi->dev); 2039 if (err < 0) { 2040 rmidi_err(rmidi, "unable to register\n"); 2041 goto error; 2042 } 2043 if (rmidi->ops && rmidi->ops->dev_register) { 2044 err = rmidi->ops->dev_register(rmidi); 2045 if (err < 0) 2046 goto error_unregister; 2047 } 2048#ifdef CONFIG_SND_OSSEMUL 2049 rmidi->ossreg = 0; 2050 if (!rawmidi_is_ump(rmidi) && 2051 (int)rmidi->device == midi_map[rmidi->card->number]) { 2052 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, 2053 rmidi->card, 0, &snd_rawmidi_f_ops, 2054 rmidi) < 0) { 2055 rmidi_err(rmidi, 2056 "unable to register OSS rawmidi device %i:%i\n", 2057 rmidi->card->number, 0); 2058 } else { 2059 rmidi->ossreg++; 2060#ifdef SNDRV_OSS_INFO_DEV_MIDI 2061 snd_oss_info_register(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number, rmidi->name); 2062#endif 2063 } 2064 } 2065 if (!rawmidi_is_ump(rmidi) && 2066 (int)rmidi->device == amidi_map[rmidi->card->number]) { 2067 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, 2068 rmidi->card, 1, &snd_rawmidi_f_ops, 2069 rmidi) < 0) { 2070 rmidi_err(rmidi, 2071 "unable to register OSS rawmidi device %i:%i\n", 2072 rmidi->card->number, 1); 2073 } else { 2074 rmidi->ossreg++; 2075 } 2076 } 2077#endif /* CONFIG_SND_OSSEMUL */ 2078 sprintf(name, "midi%d", rmidi->device); 2079 entry = snd_info_create_card_entry(rmidi->card, name, rmidi->card->proc_root); 2080 if (entry) { 2081 entry->private_data = rmidi; 2082 entry->c.text.read = snd_rawmidi_proc_info_read; 2083 if (snd_info_register(entry) < 0) { 2084 snd_info_free_entry(entry); 2085 entry = NULL; 2086 } 2087 } 2088 rmidi->proc_entry = entry; 2089#if IS_ENABLED(CONFIG_SND_SEQUENCER) 2090 /* no own registration mechanism? */ 2091 if (!rmidi->ops || !rmidi->ops->dev_register) { 2092 if (snd_seq_device_new(rmidi->card, rmidi->device, SNDRV_SEQ_DEV_ID_MIDISYNTH, 0, &rmidi->seq_dev) >= 0) { 2093 rmidi->seq_dev->private_data = rmidi; 2094 rmidi->seq_dev->private_free = snd_rawmidi_dev_seq_free; 2095 sprintf(rmidi->seq_dev->name, "MIDI %d-%d", rmidi->card->number, rmidi->device); 2096 snd_device_register(rmidi->card, rmidi->seq_dev); 2097 } 2098 } 2099#endif 2100 return 0; 2101 2102 error_unregister: 2103 snd_unregister_device(rmidi->dev); 2104 error: 2105 mutex_lock(®ister_mutex); 2106 list_del(&rmidi->list); 2107 mutex_unlock(®ister_mutex); 2108 return err; 2109} 2110 2111static int snd_rawmidi_dev_disconnect(struct snd_device *device) 2112{ 2113 struct snd_rawmidi *rmidi = device->device_data; 2114 int dir; 2115 2116 mutex_lock(®ister_mutex); 2117 mutex_lock(&rmidi->open_mutex); 2118 wake_up(&rmidi->open_wait); 2119 list_del_init(&rmidi->list); 2120 for (dir = 0; dir < 2; dir++) { 2121 struct snd_rawmidi_substream *s; 2122 2123 list_for_each_entry(s, &rmidi->streams[dir].substreams, list) { 2124 if (s->runtime) 2125 wake_up(&s->runtime->sleep); 2126 } 2127 } 2128 2129#ifdef CONFIG_SND_OSSEMUL 2130 if (rmidi->ossreg) { 2131 if ((int)rmidi->device == midi_map[rmidi->card->number]) { 2132 snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 0); 2133#ifdef SNDRV_OSS_INFO_DEV_MIDI 2134 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number); 2135#endif 2136 } 2137 if ((int)rmidi->device == amidi_map[rmidi->card->number]) 2138 snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 1); 2139 rmidi->ossreg = 0; 2140 } 2141#endif /* CONFIG_SND_OSSEMUL */ 2142 snd_unregister_device(rmidi->dev); 2143 mutex_unlock(&rmidi->open_mutex); 2144 mutex_unlock(®ister_mutex); 2145 return 0; 2146} 2147 2148/** 2149 * snd_rawmidi_set_ops - set the rawmidi operators 2150 * @rmidi: the rawmidi instance 2151 * @stream: the stream direction, SNDRV_RAWMIDI_STREAM_XXX 2152 * @ops: the operator table 2153 * 2154 * Sets the rawmidi operators for the given stream direction. 2155 */ 2156void snd_rawmidi_set_ops(struct snd_rawmidi *rmidi, int stream, 2157 const struct snd_rawmidi_ops *ops) 2158{ 2159 struct snd_rawmidi_substream *substream; 2160 2161 list_for_each_entry(substream, &rmidi->streams[stream].substreams, list) 2162 substream->ops = ops; 2163} 2164EXPORT_SYMBOL(snd_rawmidi_set_ops); 2165 2166/* 2167 * ENTRY functions 2168 */ 2169 2170static int __init alsa_rawmidi_init(void) 2171{ 2172 2173 snd_ctl_register_ioctl(snd_rawmidi_control_ioctl); 2174 snd_ctl_register_ioctl_compat(snd_rawmidi_control_ioctl); 2175#ifdef CONFIG_SND_OSSEMUL 2176 { int i; 2177 /* check device map table */ 2178 for (i = 0; i < SNDRV_CARDS; i++) { 2179 if (midi_map[i] < 0 || midi_map[i] >= SNDRV_RAWMIDI_DEVICES) { 2180 pr_err("ALSA: rawmidi: invalid midi_map[%d] = %d\n", 2181 i, midi_map[i]); 2182 midi_map[i] = 0; 2183 } 2184 if (amidi_map[i] < 0 || amidi_map[i] >= SNDRV_RAWMIDI_DEVICES) { 2185 pr_err("ALSA: rawmidi: invalid amidi_map[%d] = %d\n", 2186 i, amidi_map[i]); 2187 amidi_map[i] = 1; 2188 } 2189 } 2190 } 2191#endif /* CONFIG_SND_OSSEMUL */ 2192 return 0; 2193} 2194 2195static void __exit alsa_rawmidi_exit(void) 2196{ 2197 snd_ctl_unregister_ioctl(snd_rawmidi_control_ioctl); 2198 snd_ctl_unregister_ioctl_compat(snd_rawmidi_control_ioctl); 2199} 2200 2201module_init(alsa_rawmidi_init) 2202module_exit(alsa_rawmidi_exit) 2203