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