1 /* 2 * Abstract layer for MIDI v1.0 stream 3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz> 4 * 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, write to the Free Software 18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 19 * 20 */ 21 22 #include <sound/core.h> 23 #include <linux/major.h> 24 #include <linux/init.h> 25 #include <linux/sched/signal.h> 26 #include <linux/slab.h> 27 #include <linux/time.h> 28 #include <linux/wait.h> 29 #include <linux/mutex.h> 30 #include <linux/module.h> 31 #include <linux/delay.h> 32 #include <sound/rawmidi.h> 33 #include <sound/info.h> 34 #include <sound/control.h> 35 #include <sound/minors.h> 36 #include <sound/initval.h> 37 38 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>"); 39 MODULE_DESCRIPTION("Midlevel RawMidi code for ALSA."); 40 MODULE_LICENSE("GPL"); 41 42 #ifdef CONFIG_SND_OSSEMUL 43 static int midi_map[SNDRV_CARDS]; 44 static int amidi_map[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS-1)] = 1}; 45 module_param_array(midi_map, int, NULL, 0444); 46 MODULE_PARM_DESC(midi_map, "Raw MIDI device number assigned to 1st OSS device."); 47 module_param_array(amidi_map, int, NULL, 0444); 48 MODULE_PARM_DESC(amidi_map, "Raw MIDI device number assigned to 2nd OSS device."); 49 #endif /* CONFIG_SND_OSSEMUL */ 50 51 static int snd_rawmidi_free(struct snd_rawmidi *rawmidi); 52 static int snd_rawmidi_dev_free(struct snd_device *device); 53 static int snd_rawmidi_dev_register(struct snd_device *device); 54 static int snd_rawmidi_dev_disconnect(struct snd_device *device); 55 56 static LIST_HEAD(snd_rawmidi_devices); 57 static DEFINE_MUTEX(register_mutex); 58 59 #define rmidi_err(rmidi, fmt, args...) \ 60 dev_err(&(rmidi)->dev, fmt, ##args) 61 #define rmidi_warn(rmidi, fmt, args...) \ 62 dev_warn(&(rmidi)->dev, fmt, ##args) 63 #define rmidi_dbg(rmidi, fmt, args...) \ 64 dev_dbg(&(rmidi)->dev, fmt, ##args) 65 66 static struct snd_rawmidi *snd_rawmidi_search(struct snd_card *card, int device) 67 { 68 struct snd_rawmidi *rawmidi; 69 70 list_for_each_entry(rawmidi, &snd_rawmidi_devices, list) 71 if (rawmidi->card == card && rawmidi->device == device) 72 return rawmidi; 73 return NULL; 74 } 75 76 static inline unsigned short snd_rawmidi_file_flags(struct file *file) 77 { 78 switch (file->f_mode & (FMODE_READ | FMODE_WRITE)) { 79 case FMODE_WRITE: 80 return SNDRV_RAWMIDI_LFLG_OUTPUT; 81 case FMODE_READ: 82 return SNDRV_RAWMIDI_LFLG_INPUT; 83 default: 84 return SNDRV_RAWMIDI_LFLG_OPEN; 85 } 86 } 87 88 static inline int snd_rawmidi_ready(struct snd_rawmidi_substream *substream) 89 { 90 struct snd_rawmidi_runtime *runtime = substream->runtime; 91 return runtime->avail >= runtime->avail_min; 92 } 93 94 static inline int snd_rawmidi_ready_append(struct snd_rawmidi_substream *substream, 95 size_t count) 96 { 97 struct snd_rawmidi_runtime *runtime = substream->runtime; 98 return runtime->avail >= runtime->avail_min && 99 (!substream->append || runtime->avail >= count); 100 } 101 102 static void snd_rawmidi_input_event_work(struct work_struct *work) 103 { 104 struct snd_rawmidi_runtime *runtime = 105 container_of(work, struct snd_rawmidi_runtime, event_work); 106 if (runtime->event) 107 runtime->event(runtime->substream); 108 } 109 110 static int snd_rawmidi_runtime_create(struct snd_rawmidi_substream *substream) 111 { 112 struct snd_rawmidi_runtime *runtime; 113 114 if ((runtime = kzalloc(sizeof(*runtime), GFP_KERNEL)) == NULL) 115 return -ENOMEM; 116 runtime->substream = substream; 117 spin_lock_init(&runtime->lock); 118 init_waitqueue_head(&runtime->sleep); 119 INIT_WORK(&runtime->event_work, snd_rawmidi_input_event_work); 120 runtime->event = NULL; 121 runtime->buffer_size = PAGE_SIZE; 122 runtime->avail_min = 1; 123 if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT) 124 runtime->avail = 0; 125 else 126 runtime->avail = runtime->buffer_size; 127 if ((runtime->buffer = kmalloc(runtime->buffer_size, GFP_KERNEL)) == NULL) { 128 kfree(runtime); 129 return -ENOMEM; 130 } 131 runtime->appl_ptr = runtime->hw_ptr = 0; 132 substream->runtime = runtime; 133 return 0; 134 } 135 136 static int snd_rawmidi_runtime_free(struct snd_rawmidi_substream *substream) 137 { 138 struct snd_rawmidi_runtime *runtime = substream->runtime; 139 140 kfree(runtime->buffer); 141 kfree(runtime); 142 substream->runtime = NULL; 143 return 0; 144 } 145 146 static inline void snd_rawmidi_output_trigger(struct snd_rawmidi_substream *substream,int up) 147 { 148 if (!substream->opened) 149 return; 150 substream->ops->trigger(substream, up); 151 } 152 153 static void snd_rawmidi_input_trigger(struct snd_rawmidi_substream *substream, int up) 154 { 155 if (!substream->opened) 156 return; 157 substream->ops->trigger(substream, up); 158 if (!up) 159 cancel_work_sync(&substream->runtime->event_work); 160 } 161 162 int snd_rawmidi_drop_output(struct snd_rawmidi_substream *substream) 163 { 164 unsigned long flags; 165 struct snd_rawmidi_runtime *runtime = substream->runtime; 166 167 snd_rawmidi_output_trigger(substream, 0); 168 runtime->drain = 0; 169 spin_lock_irqsave(&runtime->lock, flags); 170 runtime->appl_ptr = runtime->hw_ptr = 0; 171 runtime->avail = runtime->buffer_size; 172 spin_unlock_irqrestore(&runtime->lock, flags); 173 return 0; 174 } 175 EXPORT_SYMBOL(snd_rawmidi_drop_output); 176 177 int snd_rawmidi_drain_output(struct snd_rawmidi_substream *substream) 178 { 179 int err; 180 long timeout; 181 struct snd_rawmidi_runtime *runtime = substream->runtime; 182 183 err = 0; 184 runtime->drain = 1; 185 timeout = wait_event_interruptible_timeout(runtime->sleep, 186 (runtime->avail >= runtime->buffer_size), 187 10*HZ); 188 if (signal_pending(current)) 189 err = -ERESTARTSYS; 190 if (runtime->avail < runtime->buffer_size && !timeout) { 191 rmidi_warn(substream->rmidi, 192 "rawmidi drain error (avail = %li, buffer_size = %li)\n", 193 (long)runtime->avail, (long)runtime->buffer_size); 194 err = -EIO; 195 } 196 runtime->drain = 0; 197 if (err != -ERESTARTSYS) { 198 /* we need wait a while to make sure that Tx FIFOs are empty */ 199 if (substream->ops->drain) 200 substream->ops->drain(substream); 201 else 202 msleep(50); 203 snd_rawmidi_drop_output(substream); 204 } 205 return err; 206 } 207 EXPORT_SYMBOL(snd_rawmidi_drain_output); 208 209 int snd_rawmidi_drain_input(struct snd_rawmidi_substream *substream) 210 { 211 unsigned long flags; 212 struct snd_rawmidi_runtime *runtime = substream->runtime; 213 214 snd_rawmidi_input_trigger(substream, 0); 215 runtime->drain = 0; 216 spin_lock_irqsave(&runtime->lock, flags); 217 runtime->appl_ptr = runtime->hw_ptr = 0; 218 runtime->avail = 0; 219 spin_unlock_irqrestore(&runtime->lock, flags); 220 return 0; 221 } 222 EXPORT_SYMBOL(snd_rawmidi_drain_input); 223 224 /* look for an available substream for the given stream direction; 225 * if a specific subdevice is given, try to assign it 226 */ 227 static int assign_substream(struct snd_rawmidi *rmidi, int subdevice, 228 int stream, int mode, 229 struct snd_rawmidi_substream **sub_ret) 230 { 231 struct snd_rawmidi_substream *substream; 232 struct snd_rawmidi_str *s = &rmidi->streams[stream]; 233 static unsigned int info_flags[2] = { 234 [SNDRV_RAWMIDI_STREAM_OUTPUT] = SNDRV_RAWMIDI_INFO_OUTPUT, 235 [SNDRV_RAWMIDI_STREAM_INPUT] = SNDRV_RAWMIDI_INFO_INPUT, 236 }; 237 238 if (!(rmidi->info_flags & info_flags[stream])) 239 return -ENXIO; 240 if (subdevice >= 0 && subdevice >= s->substream_count) 241 return -ENODEV; 242 243 list_for_each_entry(substream, &s->substreams, list) { 244 if (substream->opened) { 245 if (stream == SNDRV_RAWMIDI_STREAM_INPUT || 246 !(mode & SNDRV_RAWMIDI_LFLG_APPEND) || 247 !substream->append) 248 continue; 249 } 250 if (subdevice < 0 || subdevice == substream->number) { 251 *sub_ret = substream; 252 return 0; 253 } 254 } 255 return -EAGAIN; 256 } 257 258 /* open and do ref-counting for the given substream */ 259 static int open_substream(struct snd_rawmidi *rmidi, 260 struct snd_rawmidi_substream *substream, 261 int mode) 262 { 263 int err; 264 265 if (substream->use_count == 0) { 266 err = snd_rawmidi_runtime_create(substream); 267 if (err < 0) 268 return err; 269 err = substream->ops->open(substream); 270 if (err < 0) { 271 snd_rawmidi_runtime_free(substream); 272 return err; 273 } 274 substream->opened = 1; 275 substream->active_sensing = 0; 276 if (mode & SNDRV_RAWMIDI_LFLG_APPEND) 277 substream->append = 1; 278 substream->pid = get_pid(task_pid(current)); 279 rmidi->streams[substream->stream].substream_opened++; 280 } 281 substream->use_count++; 282 return 0; 283 } 284 285 static void close_substream(struct snd_rawmidi *rmidi, 286 struct snd_rawmidi_substream *substream, 287 int cleanup); 288 289 static int rawmidi_open_priv(struct snd_rawmidi *rmidi, int subdevice, int mode, 290 struct snd_rawmidi_file *rfile) 291 { 292 struct snd_rawmidi_substream *sinput = NULL, *soutput = NULL; 293 int err; 294 295 rfile->input = rfile->output = NULL; 296 if (mode & SNDRV_RAWMIDI_LFLG_INPUT) { 297 err = assign_substream(rmidi, subdevice, 298 SNDRV_RAWMIDI_STREAM_INPUT, 299 mode, &sinput); 300 if (err < 0) 301 return err; 302 } 303 if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) { 304 err = assign_substream(rmidi, subdevice, 305 SNDRV_RAWMIDI_STREAM_OUTPUT, 306 mode, &soutput); 307 if (err < 0) 308 return err; 309 } 310 311 if (sinput) { 312 err = open_substream(rmidi, sinput, mode); 313 if (err < 0) 314 return err; 315 } 316 if (soutput) { 317 err = open_substream(rmidi, soutput, mode); 318 if (err < 0) { 319 if (sinput) 320 close_substream(rmidi, sinput, 0); 321 return err; 322 } 323 } 324 325 rfile->rmidi = rmidi; 326 rfile->input = sinput; 327 rfile->output = soutput; 328 return 0; 329 } 330 331 /* called from sound/core/seq/seq_midi.c */ 332 int snd_rawmidi_kernel_open(struct snd_card *card, int device, int subdevice, 333 int mode, struct snd_rawmidi_file * rfile) 334 { 335 struct snd_rawmidi *rmidi; 336 int err; 337 338 if (snd_BUG_ON(!rfile)) 339 return -EINVAL; 340 341 mutex_lock(®ister_mutex); 342 rmidi = snd_rawmidi_search(card, device); 343 if (rmidi == NULL) { 344 mutex_unlock(®ister_mutex); 345 return -ENODEV; 346 } 347 if (!try_module_get(rmidi->card->module)) { 348 mutex_unlock(®ister_mutex); 349 return -ENXIO; 350 } 351 mutex_unlock(®ister_mutex); 352 353 mutex_lock(&rmidi->open_mutex); 354 err = rawmidi_open_priv(rmidi, subdevice, mode, rfile); 355 mutex_unlock(&rmidi->open_mutex); 356 if (err < 0) 357 module_put(rmidi->card->module); 358 return err; 359 } 360 EXPORT_SYMBOL(snd_rawmidi_kernel_open); 361 362 static int snd_rawmidi_open(struct inode *inode, struct file *file) 363 { 364 int maj = imajor(inode); 365 struct snd_card *card; 366 int subdevice; 367 unsigned short fflags; 368 int err; 369 struct snd_rawmidi *rmidi; 370 struct snd_rawmidi_file *rawmidi_file = NULL; 371 wait_queue_entry_t wait; 372 373 if ((file->f_flags & O_APPEND) && !(file->f_flags & O_NONBLOCK)) 374 return -EINVAL; /* invalid combination */ 375 376 err = nonseekable_open(inode, file); 377 if (err < 0) 378 return err; 379 380 if (maj == snd_major) { 381 rmidi = snd_lookup_minor_data(iminor(inode), 382 SNDRV_DEVICE_TYPE_RAWMIDI); 383 #ifdef CONFIG_SND_OSSEMUL 384 } else if (maj == SOUND_MAJOR) { 385 rmidi = snd_lookup_oss_minor_data(iminor(inode), 386 SNDRV_OSS_DEVICE_TYPE_MIDI); 387 #endif 388 } else 389 return -ENXIO; 390 391 if (rmidi == NULL) 392 return -ENODEV; 393 394 if (!try_module_get(rmidi->card->module)) { 395 snd_card_unref(rmidi->card); 396 return -ENXIO; 397 } 398 399 mutex_lock(&rmidi->open_mutex); 400 card = rmidi->card; 401 err = snd_card_file_add(card, file); 402 if (err < 0) 403 goto __error_card; 404 fflags = snd_rawmidi_file_flags(file); 405 if ((file->f_flags & O_APPEND) || maj == SOUND_MAJOR) /* OSS emul? */ 406 fflags |= SNDRV_RAWMIDI_LFLG_APPEND; 407 rawmidi_file = kmalloc(sizeof(*rawmidi_file), GFP_KERNEL); 408 if (rawmidi_file == NULL) { 409 err = -ENOMEM; 410 goto __error; 411 } 412 init_waitqueue_entry(&wait, current); 413 add_wait_queue(&rmidi->open_wait, &wait); 414 while (1) { 415 subdevice = snd_ctl_get_preferred_subdevice(card, SND_CTL_SUBDEV_RAWMIDI); 416 err = rawmidi_open_priv(rmidi, subdevice, fflags, rawmidi_file); 417 if (err >= 0) 418 break; 419 if (err == -EAGAIN) { 420 if (file->f_flags & O_NONBLOCK) { 421 err = -EBUSY; 422 break; 423 } 424 } else 425 break; 426 set_current_state(TASK_INTERRUPTIBLE); 427 mutex_unlock(&rmidi->open_mutex); 428 schedule(); 429 mutex_lock(&rmidi->open_mutex); 430 if (rmidi->card->shutdown) { 431 err = -ENODEV; 432 break; 433 } 434 if (signal_pending(current)) { 435 err = -ERESTARTSYS; 436 break; 437 } 438 } 439 remove_wait_queue(&rmidi->open_wait, &wait); 440 if (err < 0) { 441 kfree(rawmidi_file); 442 goto __error; 443 } 444 #ifdef CONFIG_SND_OSSEMUL 445 if (rawmidi_file->input && rawmidi_file->input->runtime) 446 rawmidi_file->input->runtime->oss = (maj == SOUND_MAJOR); 447 if (rawmidi_file->output && rawmidi_file->output->runtime) 448 rawmidi_file->output->runtime->oss = (maj == SOUND_MAJOR); 449 #endif 450 file->private_data = rawmidi_file; 451 mutex_unlock(&rmidi->open_mutex); 452 snd_card_unref(rmidi->card); 453 return 0; 454 455 __error: 456 snd_card_file_remove(card, file); 457 __error_card: 458 mutex_unlock(&rmidi->open_mutex); 459 module_put(rmidi->card->module); 460 snd_card_unref(rmidi->card); 461 return err; 462 } 463 464 static void close_substream(struct snd_rawmidi *rmidi, 465 struct snd_rawmidi_substream *substream, 466 int cleanup) 467 { 468 if (--substream->use_count) 469 return; 470 471 if (cleanup) { 472 if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT) 473 snd_rawmidi_input_trigger(substream, 0); 474 else { 475 if (substream->active_sensing) { 476 unsigned char buf = 0xfe; 477 /* sending single active sensing message 478 * to shut the device up 479 */ 480 snd_rawmidi_kernel_write(substream, &buf, 1); 481 } 482 if (snd_rawmidi_drain_output(substream) == -ERESTARTSYS) 483 snd_rawmidi_output_trigger(substream, 0); 484 } 485 } 486 substream->ops->close(substream); 487 if (substream->runtime->private_free) 488 substream->runtime->private_free(substream); 489 snd_rawmidi_runtime_free(substream); 490 substream->opened = 0; 491 substream->append = 0; 492 put_pid(substream->pid); 493 substream->pid = NULL; 494 rmidi->streams[substream->stream].substream_opened--; 495 } 496 497 static void rawmidi_release_priv(struct snd_rawmidi_file *rfile) 498 { 499 struct snd_rawmidi *rmidi; 500 501 rmidi = rfile->rmidi; 502 mutex_lock(&rmidi->open_mutex); 503 if (rfile->input) { 504 close_substream(rmidi, rfile->input, 1); 505 rfile->input = NULL; 506 } 507 if (rfile->output) { 508 close_substream(rmidi, rfile->output, 1); 509 rfile->output = NULL; 510 } 511 rfile->rmidi = NULL; 512 mutex_unlock(&rmidi->open_mutex); 513 wake_up(&rmidi->open_wait); 514 } 515 516 /* called from sound/core/seq/seq_midi.c */ 517 int snd_rawmidi_kernel_release(struct snd_rawmidi_file *rfile) 518 { 519 struct snd_rawmidi *rmidi; 520 521 if (snd_BUG_ON(!rfile)) 522 return -ENXIO; 523 524 rmidi = rfile->rmidi; 525 rawmidi_release_priv(rfile); 526 module_put(rmidi->card->module); 527 return 0; 528 } 529 EXPORT_SYMBOL(snd_rawmidi_kernel_release); 530 531 static int snd_rawmidi_release(struct inode *inode, struct file *file) 532 { 533 struct snd_rawmidi_file *rfile; 534 struct snd_rawmidi *rmidi; 535 struct module *module; 536 537 rfile = file->private_data; 538 rmidi = rfile->rmidi; 539 rawmidi_release_priv(rfile); 540 kfree(rfile); 541 module = rmidi->card->module; 542 snd_card_file_remove(rmidi->card, file); 543 module_put(module); 544 return 0; 545 } 546 547 static int snd_rawmidi_info(struct snd_rawmidi_substream *substream, 548 struct snd_rawmidi_info *info) 549 { 550 struct snd_rawmidi *rmidi; 551 552 if (substream == NULL) 553 return -ENODEV; 554 rmidi = substream->rmidi; 555 memset(info, 0, sizeof(*info)); 556 info->card = rmidi->card->number; 557 info->device = rmidi->device; 558 info->subdevice = substream->number; 559 info->stream = substream->stream; 560 info->flags = rmidi->info_flags; 561 strcpy(info->id, rmidi->id); 562 strcpy(info->name, rmidi->name); 563 strcpy(info->subname, substream->name); 564 info->subdevices_count = substream->pstr->substream_count; 565 info->subdevices_avail = (substream->pstr->substream_count - 566 substream->pstr->substream_opened); 567 return 0; 568 } 569 570 static int snd_rawmidi_info_user(struct snd_rawmidi_substream *substream, 571 struct snd_rawmidi_info __user * _info) 572 { 573 struct snd_rawmidi_info info; 574 int err; 575 if ((err = snd_rawmidi_info(substream, &info)) < 0) 576 return err; 577 if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info))) 578 return -EFAULT; 579 return 0; 580 } 581 582 static int __snd_rawmidi_info_select(struct snd_card *card, 583 struct snd_rawmidi_info *info) 584 { 585 struct snd_rawmidi *rmidi; 586 struct snd_rawmidi_str *pstr; 587 struct snd_rawmidi_substream *substream; 588 589 rmidi = snd_rawmidi_search(card, info->device); 590 if (!rmidi) 591 return -ENXIO; 592 if (info->stream < 0 || info->stream > 1) 593 return -EINVAL; 594 pstr = &rmidi->streams[info->stream]; 595 if (pstr->substream_count == 0) 596 return -ENOENT; 597 if (info->subdevice >= pstr->substream_count) 598 return -ENXIO; 599 list_for_each_entry(substream, &pstr->substreams, list) { 600 if ((unsigned int)substream->number == info->subdevice) 601 return snd_rawmidi_info(substream, info); 602 } 603 return -ENXIO; 604 } 605 606 int snd_rawmidi_info_select(struct snd_card *card, struct snd_rawmidi_info *info) 607 { 608 int ret; 609 610 mutex_lock(®ister_mutex); 611 ret = __snd_rawmidi_info_select(card, info); 612 mutex_unlock(®ister_mutex); 613 return ret; 614 } 615 EXPORT_SYMBOL(snd_rawmidi_info_select); 616 617 static int snd_rawmidi_info_select_user(struct snd_card *card, 618 struct snd_rawmidi_info __user *_info) 619 { 620 int err; 621 struct snd_rawmidi_info info; 622 if (get_user(info.device, &_info->device)) 623 return -EFAULT; 624 if (get_user(info.stream, &_info->stream)) 625 return -EFAULT; 626 if (get_user(info.subdevice, &_info->subdevice)) 627 return -EFAULT; 628 if ((err = snd_rawmidi_info_select(card, &info)) < 0) 629 return err; 630 if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info))) 631 return -EFAULT; 632 return 0; 633 } 634 635 int snd_rawmidi_output_params(struct snd_rawmidi_substream *substream, 636 struct snd_rawmidi_params * params) 637 { 638 char *newbuf; 639 struct snd_rawmidi_runtime *runtime = substream->runtime; 640 641 if (substream->append && substream->use_count > 1) 642 return -EBUSY; 643 snd_rawmidi_drain_output(substream); 644 if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L) { 645 return -EINVAL; 646 } 647 if (params->avail_min < 1 || params->avail_min > params->buffer_size) { 648 return -EINVAL; 649 } 650 if (params->buffer_size != runtime->buffer_size) { 651 newbuf = krealloc(runtime->buffer, params->buffer_size, 652 GFP_KERNEL); 653 if (!newbuf) 654 return -ENOMEM; 655 runtime->buffer = newbuf; 656 runtime->buffer_size = params->buffer_size; 657 runtime->avail = runtime->buffer_size; 658 } 659 runtime->avail_min = params->avail_min; 660 substream->active_sensing = !params->no_active_sensing; 661 return 0; 662 } 663 EXPORT_SYMBOL(snd_rawmidi_output_params); 664 665 int snd_rawmidi_input_params(struct snd_rawmidi_substream *substream, 666 struct snd_rawmidi_params * params) 667 { 668 char *newbuf; 669 struct snd_rawmidi_runtime *runtime = substream->runtime; 670 671 snd_rawmidi_drain_input(substream); 672 if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L) { 673 return -EINVAL; 674 } 675 if (params->avail_min < 1 || params->avail_min > params->buffer_size) { 676 return -EINVAL; 677 } 678 if (params->buffer_size != runtime->buffer_size) { 679 newbuf = krealloc(runtime->buffer, params->buffer_size, 680 GFP_KERNEL); 681 if (!newbuf) 682 return -ENOMEM; 683 runtime->buffer = newbuf; 684 runtime->buffer_size = params->buffer_size; 685 } 686 runtime->avail_min = params->avail_min; 687 return 0; 688 } 689 EXPORT_SYMBOL(snd_rawmidi_input_params); 690 691 static int snd_rawmidi_output_status(struct snd_rawmidi_substream *substream, 692 struct snd_rawmidi_status * status) 693 { 694 struct snd_rawmidi_runtime *runtime = substream->runtime; 695 696 memset(status, 0, sizeof(*status)); 697 status->stream = SNDRV_RAWMIDI_STREAM_OUTPUT; 698 spin_lock_irq(&runtime->lock); 699 status->avail = runtime->avail; 700 spin_unlock_irq(&runtime->lock); 701 return 0; 702 } 703 704 static int snd_rawmidi_input_status(struct snd_rawmidi_substream *substream, 705 struct snd_rawmidi_status * status) 706 { 707 struct snd_rawmidi_runtime *runtime = substream->runtime; 708 709 memset(status, 0, sizeof(*status)); 710 status->stream = SNDRV_RAWMIDI_STREAM_INPUT; 711 spin_lock_irq(&runtime->lock); 712 status->avail = runtime->avail; 713 status->xruns = runtime->xruns; 714 runtime->xruns = 0; 715 spin_unlock_irq(&runtime->lock); 716 return 0; 717 } 718 719 static long snd_rawmidi_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 720 { 721 struct snd_rawmidi_file *rfile; 722 void __user *argp = (void __user *)arg; 723 724 rfile = file->private_data; 725 if (((cmd >> 8) & 0xff) != 'W') 726 return -ENOTTY; 727 switch (cmd) { 728 case SNDRV_RAWMIDI_IOCTL_PVERSION: 729 return put_user(SNDRV_RAWMIDI_VERSION, (int __user *)argp) ? -EFAULT : 0; 730 case SNDRV_RAWMIDI_IOCTL_INFO: 731 { 732 int stream; 733 struct snd_rawmidi_info __user *info = argp; 734 if (get_user(stream, &info->stream)) 735 return -EFAULT; 736 switch (stream) { 737 case SNDRV_RAWMIDI_STREAM_INPUT: 738 return snd_rawmidi_info_user(rfile->input, info); 739 case SNDRV_RAWMIDI_STREAM_OUTPUT: 740 return snd_rawmidi_info_user(rfile->output, info); 741 default: 742 return -EINVAL; 743 } 744 } 745 case SNDRV_RAWMIDI_IOCTL_PARAMS: 746 { 747 struct snd_rawmidi_params params; 748 if (copy_from_user(¶ms, argp, sizeof(struct snd_rawmidi_params))) 749 return -EFAULT; 750 switch (params.stream) { 751 case SNDRV_RAWMIDI_STREAM_OUTPUT: 752 if (rfile->output == NULL) 753 return -EINVAL; 754 return snd_rawmidi_output_params(rfile->output, ¶ms); 755 case SNDRV_RAWMIDI_STREAM_INPUT: 756 if (rfile->input == NULL) 757 return -EINVAL; 758 return snd_rawmidi_input_params(rfile->input, ¶ms); 759 default: 760 return -EINVAL; 761 } 762 } 763 case SNDRV_RAWMIDI_IOCTL_STATUS: 764 { 765 int err = 0; 766 struct snd_rawmidi_status status; 767 if (copy_from_user(&status, argp, sizeof(struct snd_rawmidi_status))) 768 return -EFAULT; 769 switch (status.stream) { 770 case SNDRV_RAWMIDI_STREAM_OUTPUT: 771 if (rfile->output == NULL) 772 return -EINVAL; 773 err = snd_rawmidi_output_status(rfile->output, &status); 774 break; 775 case SNDRV_RAWMIDI_STREAM_INPUT: 776 if (rfile->input == NULL) 777 return -EINVAL; 778 err = snd_rawmidi_input_status(rfile->input, &status); 779 break; 780 default: 781 return -EINVAL; 782 } 783 if (err < 0) 784 return err; 785 if (copy_to_user(argp, &status, sizeof(struct snd_rawmidi_status))) 786 return -EFAULT; 787 return 0; 788 } 789 case SNDRV_RAWMIDI_IOCTL_DROP: 790 { 791 int val; 792 if (get_user(val, (int __user *) argp)) 793 return -EFAULT; 794 switch (val) { 795 case SNDRV_RAWMIDI_STREAM_OUTPUT: 796 if (rfile->output == NULL) 797 return -EINVAL; 798 return snd_rawmidi_drop_output(rfile->output); 799 default: 800 return -EINVAL; 801 } 802 } 803 case SNDRV_RAWMIDI_IOCTL_DRAIN: 804 { 805 int val; 806 if (get_user(val, (int __user *) argp)) 807 return -EFAULT; 808 switch (val) { 809 case SNDRV_RAWMIDI_STREAM_OUTPUT: 810 if (rfile->output == NULL) 811 return -EINVAL; 812 return snd_rawmidi_drain_output(rfile->output); 813 case SNDRV_RAWMIDI_STREAM_INPUT: 814 if (rfile->input == NULL) 815 return -EINVAL; 816 return snd_rawmidi_drain_input(rfile->input); 817 default: 818 return -EINVAL; 819 } 820 } 821 default: 822 rmidi_dbg(rfile->rmidi, 823 "rawmidi: unknown command = 0x%x\n", cmd); 824 } 825 return -ENOTTY; 826 } 827 828 static int snd_rawmidi_control_ioctl(struct snd_card *card, 829 struct snd_ctl_file *control, 830 unsigned int cmd, 831 unsigned long arg) 832 { 833 void __user *argp = (void __user *)arg; 834 835 switch (cmd) { 836 case SNDRV_CTL_IOCTL_RAWMIDI_NEXT_DEVICE: 837 { 838 int device; 839 840 if (get_user(device, (int __user *)argp)) 841 return -EFAULT; 842 if (device >= SNDRV_RAWMIDI_DEVICES) /* next device is -1 */ 843 device = SNDRV_RAWMIDI_DEVICES - 1; 844 mutex_lock(®ister_mutex); 845 device = device < 0 ? 0 : device + 1; 846 while (device < SNDRV_RAWMIDI_DEVICES) { 847 if (snd_rawmidi_search(card, device)) 848 break; 849 device++; 850 } 851 if (device == SNDRV_RAWMIDI_DEVICES) 852 device = -1; 853 mutex_unlock(®ister_mutex); 854 if (put_user(device, (int __user *)argp)) 855 return -EFAULT; 856 return 0; 857 } 858 case SNDRV_CTL_IOCTL_RAWMIDI_PREFER_SUBDEVICE: 859 { 860 int val; 861 862 if (get_user(val, (int __user *)argp)) 863 return -EFAULT; 864 control->preferred_subdevice[SND_CTL_SUBDEV_RAWMIDI] = val; 865 return 0; 866 } 867 case SNDRV_CTL_IOCTL_RAWMIDI_INFO: 868 return snd_rawmidi_info_select_user(card, argp); 869 } 870 return -ENOIOCTLCMD; 871 } 872 873 /** 874 * snd_rawmidi_receive - receive the input data from the device 875 * @substream: the rawmidi substream 876 * @buffer: the buffer pointer 877 * @count: the data size to read 878 * 879 * Reads the data from the internal buffer. 880 * 881 * Return: The size of read data, or a negative error code on failure. 882 */ 883 int snd_rawmidi_receive(struct snd_rawmidi_substream *substream, 884 const unsigned char *buffer, int count) 885 { 886 unsigned long flags; 887 int result = 0, count1; 888 struct snd_rawmidi_runtime *runtime = substream->runtime; 889 890 if (!substream->opened) 891 return -EBADFD; 892 if (runtime->buffer == NULL) { 893 rmidi_dbg(substream->rmidi, 894 "snd_rawmidi_receive: input is not active!!!\n"); 895 return -EINVAL; 896 } 897 spin_lock_irqsave(&runtime->lock, flags); 898 if (count == 1) { /* special case, faster code */ 899 substream->bytes++; 900 if (runtime->avail < runtime->buffer_size) { 901 runtime->buffer[runtime->hw_ptr++] = buffer[0]; 902 runtime->hw_ptr %= runtime->buffer_size; 903 runtime->avail++; 904 result++; 905 } else { 906 runtime->xruns++; 907 } 908 } else { 909 substream->bytes += count; 910 count1 = runtime->buffer_size - runtime->hw_ptr; 911 if (count1 > count) 912 count1 = count; 913 if (count1 > (int)(runtime->buffer_size - runtime->avail)) 914 count1 = runtime->buffer_size - runtime->avail; 915 memcpy(runtime->buffer + runtime->hw_ptr, buffer, count1); 916 runtime->hw_ptr += count1; 917 runtime->hw_ptr %= runtime->buffer_size; 918 runtime->avail += count1; 919 count -= count1; 920 result += count1; 921 if (count > 0) { 922 buffer += count1; 923 count1 = count; 924 if (count1 > (int)(runtime->buffer_size - runtime->avail)) { 925 count1 = runtime->buffer_size - runtime->avail; 926 runtime->xruns += count - count1; 927 } 928 if (count1 > 0) { 929 memcpy(runtime->buffer, buffer, count1); 930 runtime->hw_ptr = count1; 931 runtime->avail += count1; 932 result += count1; 933 } 934 } 935 } 936 if (result > 0) { 937 if (runtime->event) 938 schedule_work(&runtime->event_work); 939 else if (snd_rawmidi_ready(substream)) 940 wake_up(&runtime->sleep); 941 } 942 spin_unlock_irqrestore(&runtime->lock, flags); 943 return result; 944 } 945 EXPORT_SYMBOL(snd_rawmidi_receive); 946 947 static long snd_rawmidi_kernel_read1(struct snd_rawmidi_substream *substream, 948 unsigned char __user *userbuf, 949 unsigned char *kernelbuf, long count) 950 { 951 unsigned long flags; 952 long result = 0, count1; 953 struct snd_rawmidi_runtime *runtime = substream->runtime; 954 unsigned long appl_ptr; 955 956 spin_lock_irqsave(&runtime->lock, flags); 957 while (count > 0 && runtime->avail) { 958 count1 = runtime->buffer_size - runtime->appl_ptr; 959 if (count1 > count) 960 count1 = count; 961 if (count1 > (int)runtime->avail) 962 count1 = runtime->avail; 963 964 /* update runtime->appl_ptr before unlocking for userbuf */ 965 appl_ptr = runtime->appl_ptr; 966 runtime->appl_ptr += count1; 967 runtime->appl_ptr %= runtime->buffer_size; 968 runtime->avail -= count1; 969 970 if (kernelbuf) 971 memcpy(kernelbuf + result, runtime->buffer + appl_ptr, count1); 972 if (userbuf) { 973 spin_unlock_irqrestore(&runtime->lock, flags); 974 if (copy_to_user(userbuf + result, 975 runtime->buffer + appl_ptr, count1)) { 976 return result > 0 ? result : -EFAULT; 977 } 978 spin_lock_irqsave(&runtime->lock, flags); 979 } 980 result += count1; 981 count -= count1; 982 } 983 spin_unlock_irqrestore(&runtime->lock, flags); 984 return result; 985 } 986 987 long snd_rawmidi_kernel_read(struct snd_rawmidi_substream *substream, 988 unsigned char *buf, long count) 989 { 990 snd_rawmidi_input_trigger(substream, 1); 991 return snd_rawmidi_kernel_read1(substream, NULL/*userbuf*/, buf, count); 992 } 993 EXPORT_SYMBOL(snd_rawmidi_kernel_read); 994 995 static ssize_t snd_rawmidi_read(struct file *file, char __user *buf, size_t count, 996 loff_t *offset) 997 { 998 long result; 999 int count1; 1000 struct snd_rawmidi_file *rfile; 1001 struct snd_rawmidi_substream *substream; 1002 struct snd_rawmidi_runtime *runtime; 1003 1004 rfile = file->private_data; 1005 substream = rfile->input; 1006 if (substream == NULL) 1007 return -EIO; 1008 runtime = substream->runtime; 1009 snd_rawmidi_input_trigger(substream, 1); 1010 result = 0; 1011 while (count > 0) { 1012 spin_lock_irq(&runtime->lock); 1013 while (!snd_rawmidi_ready(substream)) { 1014 wait_queue_entry_t wait; 1015 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) { 1016 spin_unlock_irq(&runtime->lock); 1017 return result > 0 ? result : -EAGAIN; 1018 } 1019 init_waitqueue_entry(&wait, current); 1020 add_wait_queue(&runtime->sleep, &wait); 1021 set_current_state(TASK_INTERRUPTIBLE); 1022 spin_unlock_irq(&runtime->lock); 1023 schedule(); 1024 remove_wait_queue(&runtime->sleep, &wait); 1025 if (rfile->rmidi->card->shutdown) 1026 return -ENODEV; 1027 if (signal_pending(current)) 1028 return result > 0 ? result : -ERESTARTSYS; 1029 if (!runtime->avail) 1030 return result > 0 ? result : -EIO; 1031 spin_lock_irq(&runtime->lock); 1032 } 1033 spin_unlock_irq(&runtime->lock); 1034 count1 = snd_rawmidi_kernel_read1(substream, 1035 (unsigned char __user *)buf, 1036 NULL/*kernelbuf*/, 1037 count); 1038 if (count1 < 0) 1039 return result > 0 ? result : count1; 1040 result += count1; 1041 buf += count1; 1042 count -= count1; 1043 } 1044 return result; 1045 } 1046 1047 /** 1048 * snd_rawmidi_transmit_empty - check whether the output buffer is empty 1049 * @substream: the rawmidi substream 1050 * 1051 * Return: 1 if the internal output buffer is empty, 0 if not. 1052 */ 1053 int snd_rawmidi_transmit_empty(struct snd_rawmidi_substream *substream) 1054 { 1055 struct snd_rawmidi_runtime *runtime = substream->runtime; 1056 int result; 1057 unsigned long flags; 1058 1059 if (runtime->buffer == NULL) { 1060 rmidi_dbg(substream->rmidi, 1061 "snd_rawmidi_transmit_empty: output is not active!!!\n"); 1062 return 1; 1063 } 1064 spin_lock_irqsave(&runtime->lock, flags); 1065 result = runtime->avail >= runtime->buffer_size; 1066 spin_unlock_irqrestore(&runtime->lock, flags); 1067 return result; 1068 } 1069 EXPORT_SYMBOL(snd_rawmidi_transmit_empty); 1070 1071 /** 1072 * __snd_rawmidi_transmit_peek - copy data from the internal buffer 1073 * @substream: the rawmidi substream 1074 * @buffer: the buffer pointer 1075 * @count: data size to transfer 1076 * 1077 * This is a variant of snd_rawmidi_transmit_peek() without spinlock. 1078 */ 1079 int __snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream, 1080 unsigned char *buffer, int count) 1081 { 1082 int result, count1; 1083 struct snd_rawmidi_runtime *runtime = substream->runtime; 1084 1085 if (runtime->buffer == NULL) { 1086 rmidi_dbg(substream->rmidi, 1087 "snd_rawmidi_transmit_peek: output is not active!!!\n"); 1088 return -EINVAL; 1089 } 1090 result = 0; 1091 if (runtime->avail >= runtime->buffer_size) { 1092 /* warning: lowlevel layer MUST trigger down the hardware */ 1093 goto __skip; 1094 } 1095 if (count == 1) { /* special case, faster code */ 1096 *buffer = runtime->buffer[runtime->hw_ptr]; 1097 result++; 1098 } else { 1099 count1 = runtime->buffer_size - runtime->hw_ptr; 1100 if (count1 > count) 1101 count1 = count; 1102 if (count1 > (int)(runtime->buffer_size - runtime->avail)) 1103 count1 = runtime->buffer_size - runtime->avail; 1104 memcpy(buffer, runtime->buffer + runtime->hw_ptr, count1); 1105 count -= count1; 1106 result += count1; 1107 if (count > 0) { 1108 if (count > (int)(runtime->buffer_size - runtime->avail - count1)) 1109 count = runtime->buffer_size - runtime->avail - count1; 1110 memcpy(buffer + count1, runtime->buffer, count); 1111 result += count; 1112 } 1113 } 1114 __skip: 1115 return result; 1116 } 1117 EXPORT_SYMBOL(__snd_rawmidi_transmit_peek); 1118 1119 /** 1120 * snd_rawmidi_transmit_peek - copy data from the internal buffer 1121 * @substream: the rawmidi substream 1122 * @buffer: the buffer pointer 1123 * @count: data size to transfer 1124 * 1125 * Copies data from the internal output buffer to the given buffer. 1126 * 1127 * Call this in the interrupt handler when the midi output is ready, 1128 * and call snd_rawmidi_transmit_ack() after the transmission is 1129 * finished. 1130 * 1131 * Return: The size of copied data, or a negative error code on failure. 1132 */ 1133 int snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream, 1134 unsigned char *buffer, int count) 1135 { 1136 struct snd_rawmidi_runtime *runtime = substream->runtime; 1137 int result; 1138 unsigned long flags; 1139 1140 spin_lock_irqsave(&runtime->lock, flags); 1141 result = __snd_rawmidi_transmit_peek(substream, buffer, count); 1142 spin_unlock_irqrestore(&runtime->lock, flags); 1143 return result; 1144 } 1145 EXPORT_SYMBOL(snd_rawmidi_transmit_peek); 1146 1147 /** 1148 * __snd_rawmidi_transmit_ack - acknowledge the transmission 1149 * @substream: the rawmidi substream 1150 * @count: the transferred count 1151 * 1152 * This is a variant of __snd_rawmidi_transmit_ack() without spinlock. 1153 */ 1154 int __snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count) 1155 { 1156 struct snd_rawmidi_runtime *runtime = substream->runtime; 1157 1158 if (runtime->buffer == NULL) { 1159 rmidi_dbg(substream->rmidi, 1160 "snd_rawmidi_transmit_ack: output is not active!!!\n"); 1161 return -EINVAL; 1162 } 1163 snd_BUG_ON(runtime->avail + count > runtime->buffer_size); 1164 runtime->hw_ptr += count; 1165 runtime->hw_ptr %= runtime->buffer_size; 1166 runtime->avail += count; 1167 substream->bytes += count; 1168 if (count > 0) { 1169 if (runtime->drain || snd_rawmidi_ready(substream)) 1170 wake_up(&runtime->sleep); 1171 } 1172 return count; 1173 } 1174 EXPORT_SYMBOL(__snd_rawmidi_transmit_ack); 1175 1176 /** 1177 * snd_rawmidi_transmit_ack - acknowledge the transmission 1178 * @substream: the rawmidi substream 1179 * @count: the transferred count 1180 * 1181 * Advances the hardware pointer for the internal output buffer with 1182 * the given size and updates the condition. 1183 * Call after the transmission is finished. 1184 * 1185 * Return: The advanced size if successful, or a negative error code on failure. 1186 */ 1187 int snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count) 1188 { 1189 struct snd_rawmidi_runtime *runtime = substream->runtime; 1190 int result; 1191 unsigned long flags; 1192 1193 spin_lock_irqsave(&runtime->lock, flags); 1194 result = __snd_rawmidi_transmit_ack(substream, count); 1195 spin_unlock_irqrestore(&runtime->lock, flags); 1196 return result; 1197 } 1198 EXPORT_SYMBOL(snd_rawmidi_transmit_ack); 1199 1200 /** 1201 * snd_rawmidi_transmit - copy from the buffer to the device 1202 * @substream: the rawmidi substream 1203 * @buffer: the buffer pointer 1204 * @count: the data size to transfer 1205 * 1206 * Copies data from the buffer to the device and advances the pointer. 1207 * 1208 * Return: The copied size if successful, or a negative error code on failure. 1209 */ 1210 int snd_rawmidi_transmit(struct snd_rawmidi_substream *substream, 1211 unsigned char *buffer, int count) 1212 { 1213 struct snd_rawmidi_runtime *runtime = substream->runtime; 1214 int result; 1215 unsigned long flags; 1216 1217 spin_lock_irqsave(&runtime->lock, flags); 1218 if (!substream->opened) 1219 result = -EBADFD; 1220 else { 1221 count = __snd_rawmidi_transmit_peek(substream, buffer, count); 1222 if (count <= 0) 1223 result = count; 1224 else 1225 result = __snd_rawmidi_transmit_ack(substream, count); 1226 } 1227 spin_unlock_irqrestore(&runtime->lock, flags); 1228 return result; 1229 } 1230 EXPORT_SYMBOL(snd_rawmidi_transmit); 1231 1232 static long snd_rawmidi_kernel_write1(struct snd_rawmidi_substream *substream, 1233 const unsigned char __user *userbuf, 1234 const unsigned char *kernelbuf, 1235 long count) 1236 { 1237 unsigned long flags; 1238 long count1, result; 1239 struct snd_rawmidi_runtime *runtime = substream->runtime; 1240 unsigned long appl_ptr; 1241 1242 if (!kernelbuf && !userbuf) 1243 return -EINVAL; 1244 if (snd_BUG_ON(!runtime->buffer)) 1245 return -EINVAL; 1246 1247 result = 0; 1248 spin_lock_irqsave(&runtime->lock, flags); 1249 if (substream->append) { 1250 if ((long)runtime->avail < count) { 1251 spin_unlock_irqrestore(&runtime->lock, flags); 1252 return -EAGAIN; 1253 } 1254 } 1255 while (count > 0 && runtime->avail > 0) { 1256 count1 = runtime->buffer_size - runtime->appl_ptr; 1257 if (count1 > count) 1258 count1 = count; 1259 if (count1 > (long)runtime->avail) 1260 count1 = runtime->avail; 1261 1262 /* update runtime->appl_ptr before unlocking for userbuf */ 1263 appl_ptr = runtime->appl_ptr; 1264 runtime->appl_ptr += count1; 1265 runtime->appl_ptr %= runtime->buffer_size; 1266 runtime->avail -= count1; 1267 1268 if (kernelbuf) 1269 memcpy(runtime->buffer + appl_ptr, 1270 kernelbuf + result, count1); 1271 else if (userbuf) { 1272 spin_unlock_irqrestore(&runtime->lock, flags); 1273 if (copy_from_user(runtime->buffer + appl_ptr, 1274 userbuf + result, count1)) { 1275 spin_lock_irqsave(&runtime->lock, flags); 1276 result = result > 0 ? result : -EFAULT; 1277 goto __end; 1278 } 1279 spin_lock_irqsave(&runtime->lock, flags); 1280 } 1281 result += count1; 1282 count -= count1; 1283 } 1284 __end: 1285 count1 = runtime->avail < runtime->buffer_size; 1286 spin_unlock_irqrestore(&runtime->lock, flags); 1287 if (count1) 1288 snd_rawmidi_output_trigger(substream, 1); 1289 return result; 1290 } 1291 1292 long snd_rawmidi_kernel_write(struct snd_rawmidi_substream *substream, 1293 const unsigned char *buf, long count) 1294 { 1295 return snd_rawmidi_kernel_write1(substream, NULL, buf, count); 1296 } 1297 EXPORT_SYMBOL(snd_rawmidi_kernel_write); 1298 1299 static ssize_t snd_rawmidi_write(struct file *file, const char __user *buf, 1300 size_t count, loff_t *offset) 1301 { 1302 long result, timeout; 1303 int count1; 1304 struct snd_rawmidi_file *rfile; 1305 struct snd_rawmidi_runtime *runtime; 1306 struct snd_rawmidi_substream *substream; 1307 1308 rfile = file->private_data; 1309 substream = rfile->output; 1310 runtime = substream->runtime; 1311 /* we cannot put an atomic message to our buffer */ 1312 if (substream->append && count > runtime->buffer_size) 1313 return -EIO; 1314 result = 0; 1315 while (count > 0) { 1316 spin_lock_irq(&runtime->lock); 1317 while (!snd_rawmidi_ready_append(substream, count)) { 1318 wait_queue_entry_t wait; 1319 if (file->f_flags & O_NONBLOCK) { 1320 spin_unlock_irq(&runtime->lock); 1321 return result > 0 ? result : -EAGAIN; 1322 } 1323 init_waitqueue_entry(&wait, current); 1324 add_wait_queue(&runtime->sleep, &wait); 1325 set_current_state(TASK_INTERRUPTIBLE); 1326 spin_unlock_irq(&runtime->lock); 1327 timeout = schedule_timeout(30 * HZ); 1328 remove_wait_queue(&runtime->sleep, &wait); 1329 if (rfile->rmidi->card->shutdown) 1330 return -ENODEV; 1331 if (signal_pending(current)) 1332 return result > 0 ? result : -ERESTARTSYS; 1333 if (!runtime->avail && !timeout) 1334 return result > 0 ? result : -EIO; 1335 spin_lock_irq(&runtime->lock); 1336 } 1337 spin_unlock_irq(&runtime->lock); 1338 count1 = snd_rawmidi_kernel_write1(substream, buf, NULL, count); 1339 if (count1 < 0) 1340 return result > 0 ? result : count1; 1341 result += count1; 1342 buf += count1; 1343 if ((size_t)count1 < count && (file->f_flags & O_NONBLOCK)) 1344 break; 1345 count -= count1; 1346 } 1347 if (file->f_flags & O_DSYNC) { 1348 spin_lock_irq(&runtime->lock); 1349 while (runtime->avail != runtime->buffer_size) { 1350 wait_queue_entry_t wait; 1351 unsigned int last_avail = runtime->avail; 1352 init_waitqueue_entry(&wait, current); 1353 add_wait_queue(&runtime->sleep, &wait); 1354 set_current_state(TASK_INTERRUPTIBLE); 1355 spin_unlock_irq(&runtime->lock); 1356 timeout = schedule_timeout(30 * HZ); 1357 remove_wait_queue(&runtime->sleep, &wait); 1358 if (signal_pending(current)) 1359 return result > 0 ? result : -ERESTARTSYS; 1360 if (runtime->avail == last_avail && !timeout) 1361 return result > 0 ? result : -EIO; 1362 spin_lock_irq(&runtime->lock); 1363 } 1364 spin_unlock_irq(&runtime->lock); 1365 } 1366 return result; 1367 } 1368 1369 static __poll_t snd_rawmidi_poll(struct file *file, poll_table * wait) 1370 { 1371 struct snd_rawmidi_file *rfile; 1372 struct snd_rawmidi_runtime *runtime; 1373 __poll_t mask; 1374 1375 rfile = file->private_data; 1376 if (rfile->input != NULL) { 1377 runtime = rfile->input->runtime; 1378 snd_rawmidi_input_trigger(rfile->input, 1); 1379 poll_wait(file, &runtime->sleep, wait); 1380 } 1381 if (rfile->output != NULL) { 1382 runtime = rfile->output->runtime; 1383 poll_wait(file, &runtime->sleep, wait); 1384 } 1385 mask = 0; 1386 if (rfile->input != NULL) { 1387 if (snd_rawmidi_ready(rfile->input)) 1388 mask |= EPOLLIN | EPOLLRDNORM; 1389 } 1390 if (rfile->output != NULL) { 1391 if (snd_rawmidi_ready(rfile->output)) 1392 mask |= EPOLLOUT | EPOLLWRNORM; 1393 } 1394 return mask; 1395 } 1396 1397 /* 1398 */ 1399 #ifdef CONFIG_COMPAT 1400 #include "rawmidi_compat.c" 1401 #else 1402 #define snd_rawmidi_ioctl_compat NULL 1403 #endif 1404 1405 /* 1406 1407 */ 1408 1409 static void snd_rawmidi_proc_info_read(struct snd_info_entry *entry, 1410 struct snd_info_buffer *buffer) 1411 { 1412 struct snd_rawmidi *rmidi; 1413 struct snd_rawmidi_substream *substream; 1414 struct snd_rawmidi_runtime *runtime; 1415 1416 rmidi = entry->private_data; 1417 snd_iprintf(buffer, "%s\n\n", rmidi->name); 1418 mutex_lock(&rmidi->open_mutex); 1419 if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_OUTPUT) { 1420 list_for_each_entry(substream, 1421 &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams, 1422 list) { 1423 snd_iprintf(buffer, 1424 "Output %d\n" 1425 " Tx bytes : %lu\n", 1426 substream->number, 1427 (unsigned long) substream->bytes); 1428 if (substream->opened) { 1429 snd_iprintf(buffer, 1430 " Owner PID : %d\n", 1431 pid_vnr(substream->pid)); 1432 runtime = substream->runtime; 1433 snd_iprintf(buffer, 1434 " Mode : %s\n" 1435 " Buffer size : %lu\n" 1436 " Avail : %lu\n", 1437 runtime->oss ? "OSS compatible" : "native", 1438 (unsigned long) runtime->buffer_size, 1439 (unsigned long) runtime->avail); 1440 } 1441 } 1442 } 1443 if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_INPUT) { 1444 list_for_each_entry(substream, 1445 &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams, 1446 list) { 1447 snd_iprintf(buffer, 1448 "Input %d\n" 1449 " Rx bytes : %lu\n", 1450 substream->number, 1451 (unsigned long) substream->bytes); 1452 if (substream->opened) { 1453 snd_iprintf(buffer, 1454 " Owner PID : %d\n", 1455 pid_vnr(substream->pid)); 1456 runtime = substream->runtime; 1457 snd_iprintf(buffer, 1458 " Buffer size : %lu\n" 1459 " Avail : %lu\n" 1460 " Overruns : %lu\n", 1461 (unsigned long) runtime->buffer_size, 1462 (unsigned long) runtime->avail, 1463 (unsigned long) runtime->xruns); 1464 } 1465 } 1466 } 1467 mutex_unlock(&rmidi->open_mutex); 1468 } 1469 1470 /* 1471 * Register functions 1472 */ 1473 1474 static const struct file_operations snd_rawmidi_f_ops = 1475 { 1476 .owner = THIS_MODULE, 1477 .read = snd_rawmidi_read, 1478 .write = snd_rawmidi_write, 1479 .open = snd_rawmidi_open, 1480 .release = snd_rawmidi_release, 1481 .llseek = no_llseek, 1482 .poll = snd_rawmidi_poll, 1483 .unlocked_ioctl = snd_rawmidi_ioctl, 1484 .compat_ioctl = snd_rawmidi_ioctl_compat, 1485 }; 1486 1487 static int snd_rawmidi_alloc_substreams(struct snd_rawmidi *rmidi, 1488 struct snd_rawmidi_str *stream, 1489 int direction, 1490 int count) 1491 { 1492 struct snd_rawmidi_substream *substream; 1493 int idx; 1494 1495 for (idx = 0; idx < count; idx++) { 1496 substream = kzalloc(sizeof(*substream), GFP_KERNEL); 1497 if (!substream) 1498 return -ENOMEM; 1499 substream->stream = direction; 1500 substream->number = idx; 1501 substream->rmidi = rmidi; 1502 substream->pstr = stream; 1503 list_add_tail(&substream->list, &stream->substreams); 1504 stream->substream_count++; 1505 } 1506 return 0; 1507 } 1508 1509 static void release_rawmidi_device(struct device *dev) 1510 { 1511 kfree(container_of(dev, struct snd_rawmidi, dev)); 1512 } 1513 1514 /** 1515 * snd_rawmidi_new - create a rawmidi instance 1516 * @card: the card instance 1517 * @id: the id string 1518 * @device: the device index 1519 * @output_count: the number of output streams 1520 * @input_count: the number of input streams 1521 * @rrawmidi: the pointer to store the new rawmidi instance 1522 * 1523 * Creates a new rawmidi instance. 1524 * Use snd_rawmidi_set_ops() to set the operators to the new instance. 1525 * 1526 * Return: Zero if successful, or a negative error code on failure. 1527 */ 1528 int snd_rawmidi_new(struct snd_card *card, char *id, int device, 1529 int output_count, int input_count, 1530 struct snd_rawmidi ** rrawmidi) 1531 { 1532 struct snd_rawmidi *rmidi; 1533 int err; 1534 static struct snd_device_ops ops = { 1535 .dev_free = snd_rawmidi_dev_free, 1536 .dev_register = snd_rawmidi_dev_register, 1537 .dev_disconnect = snd_rawmidi_dev_disconnect, 1538 }; 1539 1540 if (snd_BUG_ON(!card)) 1541 return -ENXIO; 1542 if (rrawmidi) 1543 *rrawmidi = NULL; 1544 rmidi = kzalloc(sizeof(*rmidi), GFP_KERNEL); 1545 if (!rmidi) 1546 return -ENOMEM; 1547 rmidi->card = card; 1548 rmidi->device = device; 1549 mutex_init(&rmidi->open_mutex); 1550 init_waitqueue_head(&rmidi->open_wait); 1551 INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams); 1552 INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams); 1553 1554 if (id != NULL) 1555 strlcpy(rmidi->id, id, sizeof(rmidi->id)); 1556 1557 snd_device_initialize(&rmidi->dev, card); 1558 rmidi->dev.release = release_rawmidi_device; 1559 dev_set_name(&rmidi->dev, "midiC%iD%i", card->number, device); 1560 1561 if ((err = snd_rawmidi_alloc_substreams(rmidi, 1562 &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT], 1563 SNDRV_RAWMIDI_STREAM_INPUT, 1564 input_count)) < 0) { 1565 snd_rawmidi_free(rmidi); 1566 return err; 1567 } 1568 if ((err = snd_rawmidi_alloc_substreams(rmidi, 1569 &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT], 1570 SNDRV_RAWMIDI_STREAM_OUTPUT, 1571 output_count)) < 0) { 1572 snd_rawmidi_free(rmidi); 1573 return err; 1574 } 1575 if ((err = snd_device_new(card, SNDRV_DEV_RAWMIDI, rmidi, &ops)) < 0) { 1576 snd_rawmidi_free(rmidi); 1577 return err; 1578 } 1579 if (rrawmidi) 1580 *rrawmidi = rmidi; 1581 return 0; 1582 } 1583 EXPORT_SYMBOL(snd_rawmidi_new); 1584 1585 static void snd_rawmidi_free_substreams(struct snd_rawmidi_str *stream) 1586 { 1587 struct snd_rawmidi_substream *substream; 1588 1589 while (!list_empty(&stream->substreams)) { 1590 substream = list_entry(stream->substreams.next, struct snd_rawmidi_substream, list); 1591 list_del(&substream->list); 1592 kfree(substream); 1593 } 1594 } 1595 1596 static int snd_rawmidi_free(struct snd_rawmidi *rmidi) 1597 { 1598 if (!rmidi) 1599 return 0; 1600 1601 snd_info_free_entry(rmidi->proc_entry); 1602 rmidi->proc_entry = NULL; 1603 mutex_lock(®ister_mutex); 1604 if (rmidi->ops && rmidi->ops->dev_unregister) 1605 rmidi->ops->dev_unregister(rmidi); 1606 mutex_unlock(®ister_mutex); 1607 1608 snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT]); 1609 snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT]); 1610 if (rmidi->private_free) 1611 rmidi->private_free(rmidi); 1612 put_device(&rmidi->dev); 1613 return 0; 1614 } 1615 1616 static int snd_rawmidi_dev_free(struct snd_device *device) 1617 { 1618 struct snd_rawmidi *rmidi = device->device_data; 1619 return snd_rawmidi_free(rmidi); 1620 } 1621 1622 #if IS_ENABLED(CONFIG_SND_SEQUENCER) 1623 static void snd_rawmidi_dev_seq_free(struct snd_seq_device *device) 1624 { 1625 struct snd_rawmidi *rmidi = device->private_data; 1626 rmidi->seq_dev = NULL; 1627 } 1628 #endif 1629 1630 static int snd_rawmidi_dev_register(struct snd_device *device) 1631 { 1632 int err; 1633 struct snd_info_entry *entry; 1634 char name[16]; 1635 struct snd_rawmidi *rmidi = device->device_data; 1636 1637 if (rmidi->device >= SNDRV_RAWMIDI_DEVICES) 1638 return -ENOMEM; 1639 mutex_lock(®ister_mutex); 1640 if (snd_rawmidi_search(rmidi->card, rmidi->device)) { 1641 mutex_unlock(®ister_mutex); 1642 return -EBUSY; 1643 } 1644 list_add_tail(&rmidi->list, &snd_rawmidi_devices); 1645 mutex_unlock(®ister_mutex); 1646 err = snd_register_device(SNDRV_DEVICE_TYPE_RAWMIDI, 1647 rmidi->card, rmidi->device, 1648 &snd_rawmidi_f_ops, rmidi, &rmidi->dev); 1649 if (err < 0) { 1650 rmidi_err(rmidi, "unable to register\n"); 1651 mutex_lock(®ister_mutex); 1652 list_del(&rmidi->list); 1653 mutex_unlock(®ister_mutex); 1654 return err; 1655 } 1656 if (rmidi->ops && rmidi->ops->dev_register && 1657 (err = rmidi->ops->dev_register(rmidi)) < 0) { 1658 snd_unregister_device(&rmidi->dev); 1659 mutex_lock(®ister_mutex); 1660 list_del(&rmidi->list); 1661 mutex_unlock(®ister_mutex); 1662 return err; 1663 } 1664 #ifdef CONFIG_SND_OSSEMUL 1665 rmidi->ossreg = 0; 1666 if ((int)rmidi->device == midi_map[rmidi->card->number]) { 1667 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, 1668 rmidi->card, 0, &snd_rawmidi_f_ops, 1669 rmidi) < 0) { 1670 rmidi_err(rmidi, 1671 "unable to register OSS rawmidi device %i:%i\n", 1672 rmidi->card->number, 0); 1673 } else { 1674 rmidi->ossreg++; 1675 #ifdef SNDRV_OSS_INFO_DEV_MIDI 1676 snd_oss_info_register(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number, rmidi->name); 1677 #endif 1678 } 1679 } 1680 if ((int)rmidi->device == amidi_map[rmidi->card->number]) { 1681 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, 1682 rmidi->card, 1, &snd_rawmidi_f_ops, 1683 rmidi) < 0) { 1684 rmidi_err(rmidi, 1685 "unable to register OSS rawmidi device %i:%i\n", 1686 rmidi->card->number, 1); 1687 } else { 1688 rmidi->ossreg++; 1689 } 1690 } 1691 #endif /* CONFIG_SND_OSSEMUL */ 1692 sprintf(name, "midi%d", rmidi->device); 1693 entry = snd_info_create_card_entry(rmidi->card, name, rmidi->card->proc_root); 1694 if (entry) { 1695 entry->private_data = rmidi; 1696 entry->c.text.read = snd_rawmidi_proc_info_read; 1697 if (snd_info_register(entry) < 0) { 1698 snd_info_free_entry(entry); 1699 entry = NULL; 1700 } 1701 } 1702 rmidi->proc_entry = entry; 1703 #if IS_ENABLED(CONFIG_SND_SEQUENCER) 1704 if (!rmidi->ops || !rmidi->ops->dev_register) { /* own registration mechanism */ 1705 if (snd_seq_device_new(rmidi->card, rmidi->device, SNDRV_SEQ_DEV_ID_MIDISYNTH, 0, &rmidi->seq_dev) >= 0) { 1706 rmidi->seq_dev->private_data = rmidi; 1707 rmidi->seq_dev->private_free = snd_rawmidi_dev_seq_free; 1708 sprintf(rmidi->seq_dev->name, "MIDI %d-%d", rmidi->card->number, rmidi->device); 1709 snd_device_register(rmidi->card, rmidi->seq_dev); 1710 } 1711 } 1712 #endif 1713 return 0; 1714 } 1715 1716 static int snd_rawmidi_dev_disconnect(struct snd_device *device) 1717 { 1718 struct snd_rawmidi *rmidi = device->device_data; 1719 int dir; 1720 1721 mutex_lock(®ister_mutex); 1722 mutex_lock(&rmidi->open_mutex); 1723 wake_up(&rmidi->open_wait); 1724 list_del_init(&rmidi->list); 1725 for (dir = 0; dir < 2; dir++) { 1726 struct snd_rawmidi_substream *s; 1727 list_for_each_entry(s, &rmidi->streams[dir].substreams, list) { 1728 if (s->runtime) 1729 wake_up(&s->runtime->sleep); 1730 } 1731 } 1732 1733 #ifdef CONFIG_SND_OSSEMUL 1734 if (rmidi->ossreg) { 1735 if ((int)rmidi->device == midi_map[rmidi->card->number]) { 1736 snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 0); 1737 #ifdef SNDRV_OSS_INFO_DEV_MIDI 1738 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number); 1739 #endif 1740 } 1741 if ((int)rmidi->device == amidi_map[rmidi->card->number]) 1742 snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 1); 1743 rmidi->ossreg = 0; 1744 } 1745 #endif /* CONFIG_SND_OSSEMUL */ 1746 snd_unregister_device(&rmidi->dev); 1747 mutex_unlock(&rmidi->open_mutex); 1748 mutex_unlock(®ister_mutex); 1749 return 0; 1750 } 1751 1752 /** 1753 * snd_rawmidi_set_ops - set the rawmidi operators 1754 * @rmidi: the rawmidi instance 1755 * @stream: the stream direction, SNDRV_RAWMIDI_STREAM_XXX 1756 * @ops: the operator table 1757 * 1758 * Sets the rawmidi operators for the given stream direction. 1759 */ 1760 void snd_rawmidi_set_ops(struct snd_rawmidi *rmidi, int stream, 1761 const struct snd_rawmidi_ops *ops) 1762 { 1763 struct snd_rawmidi_substream *substream; 1764 1765 list_for_each_entry(substream, &rmidi->streams[stream].substreams, list) 1766 substream->ops = ops; 1767 } 1768 EXPORT_SYMBOL(snd_rawmidi_set_ops); 1769 1770 /* 1771 * ENTRY functions 1772 */ 1773 1774 static int __init alsa_rawmidi_init(void) 1775 { 1776 1777 snd_ctl_register_ioctl(snd_rawmidi_control_ioctl); 1778 snd_ctl_register_ioctl_compat(snd_rawmidi_control_ioctl); 1779 #ifdef CONFIG_SND_OSSEMUL 1780 { int i; 1781 /* check device map table */ 1782 for (i = 0; i < SNDRV_CARDS; i++) { 1783 if (midi_map[i] < 0 || midi_map[i] >= SNDRV_RAWMIDI_DEVICES) { 1784 pr_err("ALSA: rawmidi: invalid midi_map[%d] = %d\n", 1785 i, midi_map[i]); 1786 midi_map[i] = 0; 1787 } 1788 if (amidi_map[i] < 0 || amidi_map[i] >= SNDRV_RAWMIDI_DEVICES) { 1789 pr_err("ALSA: rawmidi: invalid amidi_map[%d] = %d\n", 1790 i, amidi_map[i]); 1791 amidi_map[i] = 1; 1792 } 1793 } 1794 } 1795 #endif /* CONFIG_SND_OSSEMUL */ 1796 return 0; 1797 } 1798 1799 static void __exit alsa_rawmidi_exit(void) 1800 { 1801 snd_ctl_unregister_ioctl(snd_rawmidi_control_ioctl); 1802 snd_ctl_unregister_ioctl_compat(snd_rawmidi_control_ioctl); 1803 } 1804 1805 module_init(alsa_rawmidi_init) 1806 module_exit(alsa_rawmidi_exit) 1807