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.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 38MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>"); 39MODULE_DESCRIPTION("Midlevel RawMidi code for ALSA."); 40MODULE_LICENSE("GPL"); 41 42#ifdef CONFIG_SND_OSSEMUL 43static int midi_map[SNDRV_CARDS]; 44static int amidi_map[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS-1)] = 1}; 45module_param_array(midi_map, int, NULL, 0444); 46MODULE_PARM_DESC(midi_map, "Raw MIDI device number assigned to 1st OSS device."); 47module_param_array(amidi_map, int, NULL, 0444); 48MODULE_PARM_DESC(amidi_map, "Raw MIDI device number assigned to 2nd OSS device."); 49#endif /* CONFIG_SND_OSSEMUL */ 50 51static int snd_rawmidi_free(struct snd_rawmidi *rawmidi); 52static int snd_rawmidi_dev_free(struct snd_device *device); 53static int snd_rawmidi_dev_register(struct snd_device *device); 54static int snd_rawmidi_dev_disconnect(struct snd_device *device); 55 56static LIST_HEAD(snd_rawmidi_devices); 57static 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 66static 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 76static 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 88static 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 94static 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 102static 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 110static 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 136static 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 146static 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 153static 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 162int 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} 175EXPORT_SYMBOL(snd_rawmidi_drop_output); 176 177int 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} 207EXPORT_SYMBOL(snd_rawmidi_drain_output); 208 209int 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} 222EXPORT_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 */ 227static 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 */ 259static 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 285static void close_substream(struct snd_rawmidi *rmidi, 286 struct snd_rawmidi_substream *substream, 287 int cleanup); 288 289static 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 */ 332int 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} 360EXPORT_SYMBOL(snd_rawmidi_kernel_open); 361 362static 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_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 464static 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 497static 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 */ 517int 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} 529EXPORT_SYMBOL(snd_rawmidi_kernel_release); 530 531static 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 547static 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 570static 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 582int snd_rawmidi_info_select(struct snd_card *card, struct snd_rawmidi_info *info) 583{ 584 struct snd_rawmidi *rmidi; 585 struct snd_rawmidi_str *pstr; 586 struct snd_rawmidi_substream *substream; 587 588 mutex_lock(®ister_mutex); 589 rmidi = snd_rawmidi_search(card, info->device); 590 mutex_unlock(®ister_mutex); 591 if (!rmidi) 592 return -ENXIO; 593 if (info->stream < 0 || info->stream > 1) 594 return -EINVAL; 595 pstr = &rmidi->streams[info->stream]; 596 if (pstr->substream_count == 0) 597 return -ENOENT; 598 if (info->subdevice >= pstr->substream_count) 599 return -ENXIO; 600 list_for_each_entry(substream, &pstr->substreams, list) { 601 if ((unsigned int)substream->number == info->subdevice) 602 return snd_rawmidi_info(substream, info); 603 } 604 return -ENXIO; 605} 606EXPORT_SYMBOL(snd_rawmidi_info_select); 607 608static int snd_rawmidi_info_select_user(struct snd_card *card, 609 struct snd_rawmidi_info __user *_info) 610{ 611 int err; 612 struct snd_rawmidi_info info; 613 if (get_user(info.device, &_info->device)) 614 return -EFAULT; 615 if (get_user(info.stream, &_info->stream)) 616 return -EFAULT; 617 if (get_user(info.subdevice, &_info->subdevice)) 618 return -EFAULT; 619 if ((err = snd_rawmidi_info_select(card, &info)) < 0) 620 return err; 621 if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info))) 622 return -EFAULT; 623 return 0; 624} 625 626int snd_rawmidi_output_params(struct snd_rawmidi_substream *substream, 627 struct snd_rawmidi_params * params) 628{ 629 char *newbuf; 630 struct snd_rawmidi_runtime *runtime = substream->runtime; 631 632 if (substream->append && substream->use_count > 1) 633 return -EBUSY; 634 snd_rawmidi_drain_output(substream); 635 if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L) { 636 return -EINVAL; 637 } 638 if (params->avail_min < 1 || params->avail_min > params->buffer_size) { 639 return -EINVAL; 640 } 641 if (params->buffer_size != runtime->buffer_size) { 642 newbuf = krealloc(runtime->buffer, params->buffer_size, 643 GFP_KERNEL); 644 if (!newbuf) 645 return -ENOMEM; 646 runtime->buffer = newbuf; 647 runtime->buffer_size = params->buffer_size; 648 runtime->avail = runtime->buffer_size; 649 } 650 runtime->avail_min = params->avail_min; 651 substream->active_sensing = !params->no_active_sensing; 652 return 0; 653} 654EXPORT_SYMBOL(snd_rawmidi_output_params); 655 656int snd_rawmidi_input_params(struct snd_rawmidi_substream *substream, 657 struct snd_rawmidi_params * params) 658{ 659 char *newbuf; 660 struct snd_rawmidi_runtime *runtime = substream->runtime; 661 662 snd_rawmidi_drain_input(substream); 663 if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L) { 664 return -EINVAL; 665 } 666 if (params->avail_min < 1 || params->avail_min > params->buffer_size) { 667 return -EINVAL; 668 } 669 if (params->buffer_size != runtime->buffer_size) { 670 newbuf = krealloc(runtime->buffer, params->buffer_size, 671 GFP_KERNEL); 672 if (!newbuf) 673 return -ENOMEM; 674 runtime->buffer = newbuf; 675 runtime->buffer_size = params->buffer_size; 676 } 677 runtime->avail_min = params->avail_min; 678 return 0; 679} 680EXPORT_SYMBOL(snd_rawmidi_input_params); 681 682static int snd_rawmidi_output_status(struct snd_rawmidi_substream *substream, 683 struct snd_rawmidi_status * status) 684{ 685 struct snd_rawmidi_runtime *runtime = substream->runtime; 686 687 memset(status, 0, sizeof(*status)); 688 status->stream = SNDRV_RAWMIDI_STREAM_OUTPUT; 689 spin_lock_irq(&runtime->lock); 690 status->avail = runtime->avail; 691 spin_unlock_irq(&runtime->lock); 692 return 0; 693} 694 695static int snd_rawmidi_input_status(struct snd_rawmidi_substream *substream, 696 struct snd_rawmidi_status * status) 697{ 698 struct snd_rawmidi_runtime *runtime = substream->runtime; 699 700 memset(status, 0, sizeof(*status)); 701 status->stream = SNDRV_RAWMIDI_STREAM_INPUT; 702 spin_lock_irq(&runtime->lock); 703 status->avail = runtime->avail; 704 status->xruns = runtime->xruns; 705 runtime->xruns = 0; 706 spin_unlock_irq(&runtime->lock); 707 return 0; 708} 709 710static long snd_rawmidi_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 711{ 712 struct snd_rawmidi_file *rfile; 713 void __user *argp = (void __user *)arg; 714 715 rfile = file->private_data; 716 if (((cmd >> 8) & 0xff) != 'W') 717 return -ENOTTY; 718 switch (cmd) { 719 case SNDRV_RAWMIDI_IOCTL_PVERSION: 720 return put_user(SNDRV_RAWMIDI_VERSION, (int __user *)argp) ? -EFAULT : 0; 721 case SNDRV_RAWMIDI_IOCTL_INFO: 722 { 723 int stream; 724 struct snd_rawmidi_info __user *info = argp; 725 if (get_user(stream, &info->stream)) 726 return -EFAULT; 727 switch (stream) { 728 case SNDRV_RAWMIDI_STREAM_INPUT: 729 return snd_rawmidi_info_user(rfile->input, info); 730 case SNDRV_RAWMIDI_STREAM_OUTPUT: 731 return snd_rawmidi_info_user(rfile->output, info); 732 default: 733 return -EINVAL; 734 } 735 } 736 case SNDRV_RAWMIDI_IOCTL_PARAMS: 737 { 738 struct snd_rawmidi_params params; 739 if (copy_from_user(¶ms, argp, sizeof(struct snd_rawmidi_params))) 740 return -EFAULT; 741 switch (params.stream) { 742 case SNDRV_RAWMIDI_STREAM_OUTPUT: 743 if (rfile->output == NULL) 744 return -EINVAL; 745 return snd_rawmidi_output_params(rfile->output, ¶ms); 746 case SNDRV_RAWMIDI_STREAM_INPUT: 747 if (rfile->input == NULL) 748 return -EINVAL; 749 return snd_rawmidi_input_params(rfile->input, ¶ms); 750 default: 751 return -EINVAL; 752 } 753 } 754 case SNDRV_RAWMIDI_IOCTL_STATUS: 755 { 756 int err = 0; 757 struct snd_rawmidi_status status; 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 if (get_user(val, (int __user *) argp)) 784 return -EFAULT; 785 switch (val) { 786 case SNDRV_RAWMIDI_STREAM_OUTPUT: 787 if (rfile->output == NULL) 788 return -EINVAL; 789 return snd_rawmidi_drop_output(rfile->output); 790 default: 791 return -EINVAL; 792 } 793 } 794 case SNDRV_RAWMIDI_IOCTL_DRAIN: 795 { 796 int val; 797 if (get_user(val, (int __user *) argp)) 798 return -EFAULT; 799 switch (val) { 800 case SNDRV_RAWMIDI_STREAM_OUTPUT: 801 if (rfile->output == NULL) 802 return -EINVAL; 803 return snd_rawmidi_drain_output(rfile->output); 804 case SNDRV_RAWMIDI_STREAM_INPUT: 805 if (rfile->input == NULL) 806 return -EINVAL; 807 return snd_rawmidi_drain_input(rfile->input); 808 default: 809 return -EINVAL; 810 } 811 } 812 default: 813 rmidi_dbg(rfile->rmidi, 814 "rawmidi: unknown command = 0x%x\n", cmd); 815 } 816 return -ENOTTY; 817} 818 819static int snd_rawmidi_control_ioctl(struct snd_card *card, 820 struct snd_ctl_file *control, 821 unsigned int cmd, 822 unsigned long arg) 823{ 824 void __user *argp = (void __user *)arg; 825 826 switch (cmd) { 827 case SNDRV_CTL_IOCTL_RAWMIDI_NEXT_DEVICE: 828 { 829 int device; 830 831 if (get_user(device, (int __user *)argp)) 832 return -EFAULT; 833 if (device >= SNDRV_RAWMIDI_DEVICES) /* next device is -1 */ 834 device = SNDRV_RAWMIDI_DEVICES - 1; 835 mutex_lock(®ister_mutex); 836 device = device < 0 ? 0 : device + 1; 837 while (device < SNDRV_RAWMIDI_DEVICES) { 838 if (snd_rawmidi_search(card, device)) 839 break; 840 device++; 841 } 842 if (device == SNDRV_RAWMIDI_DEVICES) 843 device = -1; 844 mutex_unlock(®ister_mutex); 845 if (put_user(device, (int __user *)argp)) 846 return -EFAULT; 847 return 0; 848 } 849 case SNDRV_CTL_IOCTL_RAWMIDI_PREFER_SUBDEVICE: 850 { 851 int val; 852 853 if (get_user(val, (int __user *)argp)) 854 return -EFAULT; 855 control->preferred_subdevice[SND_CTL_SUBDEV_RAWMIDI] = val; 856 return 0; 857 } 858 case SNDRV_CTL_IOCTL_RAWMIDI_INFO: 859 return snd_rawmidi_info_select_user(card, argp); 860 } 861 return -ENOIOCTLCMD; 862} 863 864/** 865 * snd_rawmidi_receive - receive the input data from the device 866 * @substream: the rawmidi substream 867 * @buffer: the buffer pointer 868 * @count: the data size to read 869 * 870 * Reads the data from the internal buffer. 871 * 872 * Return: The size of read data, or a negative error code on failure. 873 */ 874int snd_rawmidi_receive(struct snd_rawmidi_substream *substream, 875 const unsigned char *buffer, int count) 876{ 877 unsigned long flags; 878 int result = 0, count1; 879 struct snd_rawmidi_runtime *runtime = substream->runtime; 880 881 if (!substream->opened) 882 return -EBADFD; 883 if (runtime->buffer == NULL) { 884 rmidi_dbg(substream->rmidi, 885 "snd_rawmidi_receive: input is not active!!!\n"); 886 return -EINVAL; 887 } 888 spin_lock_irqsave(&runtime->lock, flags); 889 if (count == 1) { /* special case, faster code */ 890 substream->bytes++; 891 if (runtime->avail < runtime->buffer_size) { 892 runtime->buffer[runtime->hw_ptr++] = buffer[0]; 893 runtime->hw_ptr %= runtime->buffer_size; 894 runtime->avail++; 895 result++; 896 } else { 897 runtime->xruns++; 898 } 899 } else { 900 substream->bytes += count; 901 count1 = runtime->buffer_size - runtime->hw_ptr; 902 if (count1 > count) 903 count1 = count; 904 if (count1 > (int)(runtime->buffer_size - runtime->avail)) 905 count1 = runtime->buffer_size - runtime->avail; 906 memcpy(runtime->buffer + runtime->hw_ptr, buffer, count1); 907 runtime->hw_ptr += count1; 908 runtime->hw_ptr %= runtime->buffer_size; 909 runtime->avail += count1; 910 count -= count1; 911 result += count1; 912 if (count > 0) { 913 buffer += count1; 914 count1 = count; 915 if (count1 > (int)(runtime->buffer_size - runtime->avail)) { 916 count1 = runtime->buffer_size - runtime->avail; 917 runtime->xruns += count - count1; 918 } 919 if (count1 > 0) { 920 memcpy(runtime->buffer, buffer, count1); 921 runtime->hw_ptr = count1; 922 runtime->avail += count1; 923 result += count1; 924 } 925 } 926 } 927 if (result > 0) { 928 if (runtime->event) 929 schedule_work(&runtime->event_work); 930 else if (snd_rawmidi_ready(substream)) 931 wake_up(&runtime->sleep); 932 } 933 spin_unlock_irqrestore(&runtime->lock, flags); 934 return result; 935} 936EXPORT_SYMBOL(snd_rawmidi_receive); 937 938static long snd_rawmidi_kernel_read1(struct snd_rawmidi_substream *substream, 939 unsigned char __user *userbuf, 940 unsigned char *kernelbuf, long count) 941{ 942 unsigned long flags; 943 long result = 0, count1; 944 struct snd_rawmidi_runtime *runtime = substream->runtime; 945 unsigned long appl_ptr; 946 947 spin_lock_irqsave(&runtime->lock, flags); 948 while (count > 0 && runtime->avail) { 949 count1 = runtime->buffer_size - runtime->appl_ptr; 950 if (count1 > count) 951 count1 = count; 952 if (count1 > (int)runtime->avail) 953 count1 = runtime->avail; 954 955 /* update runtime->appl_ptr before unlocking for userbuf */ 956 appl_ptr = runtime->appl_ptr; 957 runtime->appl_ptr += count1; 958 runtime->appl_ptr %= runtime->buffer_size; 959 runtime->avail -= count1; 960 961 if (kernelbuf) 962 memcpy(kernelbuf + result, runtime->buffer + appl_ptr, count1); 963 if (userbuf) { 964 spin_unlock_irqrestore(&runtime->lock, flags); 965 if (copy_to_user(userbuf + result, 966 runtime->buffer + appl_ptr, count1)) { 967 return result > 0 ? result : -EFAULT; 968 } 969 spin_lock_irqsave(&runtime->lock, flags); 970 } 971 result += count1; 972 count -= count1; 973 } 974 spin_unlock_irqrestore(&runtime->lock, flags); 975 return result; 976} 977 978long snd_rawmidi_kernel_read(struct snd_rawmidi_substream *substream, 979 unsigned char *buf, long count) 980{ 981 snd_rawmidi_input_trigger(substream, 1); 982 return snd_rawmidi_kernel_read1(substream, NULL/*userbuf*/, buf, count); 983} 984EXPORT_SYMBOL(snd_rawmidi_kernel_read); 985 986static ssize_t snd_rawmidi_read(struct file *file, char __user *buf, size_t count, 987 loff_t *offset) 988{ 989 long result; 990 int count1; 991 struct snd_rawmidi_file *rfile; 992 struct snd_rawmidi_substream *substream; 993 struct snd_rawmidi_runtime *runtime; 994 995 rfile = file->private_data; 996 substream = rfile->input; 997 if (substream == NULL) 998 return -EIO; 999 runtime = substream->runtime; 1000 snd_rawmidi_input_trigger(substream, 1); 1001 result = 0; 1002 while (count > 0) { 1003 spin_lock_irq(&runtime->lock); 1004 while (!snd_rawmidi_ready(substream)) { 1005 wait_queue_t wait; 1006 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) { 1007 spin_unlock_irq(&runtime->lock); 1008 return result > 0 ? result : -EAGAIN; 1009 } 1010 init_waitqueue_entry(&wait, current); 1011 add_wait_queue(&runtime->sleep, &wait); 1012 set_current_state(TASK_INTERRUPTIBLE); 1013 spin_unlock_irq(&runtime->lock); 1014 schedule(); 1015 remove_wait_queue(&runtime->sleep, &wait); 1016 if (rfile->rmidi->card->shutdown) 1017 return -ENODEV; 1018 if (signal_pending(current)) 1019 return result > 0 ? result : -ERESTARTSYS; 1020 if (!runtime->avail) 1021 return result > 0 ? result : -EIO; 1022 spin_lock_irq(&runtime->lock); 1023 } 1024 spin_unlock_irq(&runtime->lock); 1025 count1 = snd_rawmidi_kernel_read1(substream, 1026 (unsigned char __user *)buf, 1027 NULL/*kernelbuf*/, 1028 count); 1029 if (count1 < 0) 1030 return result > 0 ? result : count1; 1031 result += count1; 1032 buf += count1; 1033 count -= count1; 1034 } 1035 return result; 1036} 1037 1038/** 1039 * snd_rawmidi_transmit_empty - check whether the output buffer is empty 1040 * @substream: the rawmidi substream 1041 * 1042 * Return: 1 if the internal output buffer is empty, 0 if not. 1043 */ 1044int snd_rawmidi_transmit_empty(struct snd_rawmidi_substream *substream) 1045{ 1046 struct snd_rawmidi_runtime *runtime = substream->runtime; 1047 int result; 1048 unsigned long flags; 1049 1050 if (runtime->buffer == NULL) { 1051 rmidi_dbg(substream->rmidi, 1052 "snd_rawmidi_transmit_empty: output is not active!!!\n"); 1053 return 1; 1054 } 1055 spin_lock_irqsave(&runtime->lock, flags); 1056 result = runtime->avail >= runtime->buffer_size; 1057 spin_unlock_irqrestore(&runtime->lock, flags); 1058 return result; 1059} 1060EXPORT_SYMBOL(snd_rawmidi_transmit_empty); 1061 1062/** 1063 * __snd_rawmidi_transmit_peek - copy data from the internal buffer 1064 * @substream: the rawmidi substream 1065 * @buffer: the buffer pointer 1066 * @count: data size to transfer 1067 * 1068 * This is a variant of snd_rawmidi_transmit_peek() without spinlock. 1069 */ 1070int __snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream, 1071 unsigned char *buffer, int count) 1072{ 1073 int result, count1; 1074 struct snd_rawmidi_runtime *runtime = substream->runtime; 1075 1076 if (runtime->buffer == NULL) { 1077 rmidi_dbg(substream->rmidi, 1078 "snd_rawmidi_transmit_peek: output is not active!!!\n"); 1079 return -EINVAL; 1080 } 1081 result = 0; 1082 if (runtime->avail >= runtime->buffer_size) { 1083 /* warning: lowlevel layer MUST trigger down the hardware */ 1084 goto __skip; 1085 } 1086 if (count == 1) { /* special case, faster code */ 1087 *buffer = runtime->buffer[runtime->hw_ptr]; 1088 result++; 1089 } else { 1090 count1 = runtime->buffer_size - runtime->hw_ptr; 1091 if (count1 > count) 1092 count1 = count; 1093 if (count1 > (int)(runtime->buffer_size - runtime->avail)) 1094 count1 = runtime->buffer_size - runtime->avail; 1095 memcpy(buffer, runtime->buffer + runtime->hw_ptr, count1); 1096 count -= count1; 1097 result += count1; 1098 if (count > 0) { 1099 if (count > (int)(runtime->buffer_size - runtime->avail - count1)) 1100 count = runtime->buffer_size - runtime->avail - count1; 1101 memcpy(buffer + count1, runtime->buffer, count); 1102 result += count; 1103 } 1104 } 1105 __skip: 1106 return result; 1107} 1108EXPORT_SYMBOL(__snd_rawmidi_transmit_peek); 1109 1110/** 1111 * snd_rawmidi_transmit_peek - copy data from the internal buffer 1112 * @substream: the rawmidi substream 1113 * @buffer: the buffer pointer 1114 * @count: data size to transfer 1115 * 1116 * Copies data from the internal output buffer to the given buffer. 1117 * 1118 * Call this in the interrupt handler when the midi output is ready, 1119 * and call snd_rawmidi_transmit_ack() after the transmission is 1120 * finished. 1121 * 1122 * Return: The size of copied data, or a negative error code on failure. 1123 */ 1124int snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream, 1125 unsigned char *buffer, int count) 1126{ 1127 struct snd_rawmidi_runtime *runtime = substream->runtime; 1128 int result; 1129 unsigned long flags; 1130 1131 spin_lock_irqsave(&runtime->lock, flags); 1132 result = __snd_rawmidi_transmit_peek(substream, buffer, count); 1133 spin_unlock_irqrestore(&runtime->lock, flags); 1134 return result; 1135} 1136EXPORT_SYMBOL(snd_rawmidi_transmit_peek); 1137 1138/** 1139 * __snd_rawmidi_transmit_ack - acknowledge the transmission 1140 * @substream: the rawmidi substream 1141 * @count: the transferred count 1142 * 1143 * This is a variant of __snd_rawmidi_transmit_ack() without spinlock. 1144 */ 1145int __snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count) 1146{ 1147 struct snd_rawmidi_runtime *runtime = substream->runtime; 1148 1149 if (runtime->buffer == NULL) { 1150 rmidi_dbg(substream->rmidi, 1151 "snd_rawmidi_transmit_ack: output is not active!!!\n"); 1152 return -EINVAL; 1153 } 1154 snd_BUG_ON(runtime->avail + count > runtime->buffer_size); 1155 runtime->hw_ptr += count; 1156 runtime->hw_ptr %= runtime->buffer_size; 1157 runtime->avail += count; 1158 substream->bytes += count; 1159 if (count > 0) { 1160 if (runtime->drain || snd_rawmidi_ready(substream)) 1161 wake_up(&runtime->sleep); 1162 } 1163 return count; 1164} 1165EXPORT_SYMBOL(__snd_rawmidi_transmit_ack); 1166 1167/** 1168 * snd_rawmidi_transmit_ack - acknowledge the transmission 1169 * @substream: the rawmidi substream 1170 * @count: the transferred count 1171 * 1172 * Advances the hardware pointer for the internal output buffer with 1173 * the given size and updates the condition. 1174 * Call after the transmission is finished. 1175 * 1176 * Return: The advanced size if successful, or a negative error code on failure. 1177 */ 1178int snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count) 1179{ 1180 struct snd_rawmidi_runtime *runtime = substream->runtime; 1181 int result; 1182 unsigned long flags; 1183 1184 spin_lock_irqsave(&runtime->lock, flags); 1185 result = __snd_rawmidi_transmit_ack(substream, count); 1186 spin_unlock_irqrestore(&runtime->lock, flags); 1187 return result; 1188} 1189EXPORT_SYMBOL(snd_rawmidi_transmit_ack); 1190 1191/** 1192 * snd_rawmidi_transmit - copy from the buffer to the device 1193 * @substream: the rawmidi substream 1194 * @buffer: the buffer pointer 1195 * @count: the data size to transfer 1196 * 1197 * Copies data from the buffer to the device and advances the pointer. 1198 * 1199 * Return: The copied size if successful, or a negative error code on failure. 1200 */ 1201int snd_rawmidi_transmit(struct snd_rawmidi_substream *substream, 1202 unsigned char *buffer, int count) 1203{ 1204 struct snd_rawmidi_runtime *runtime = substream->runtime; 1205 int result; 1206 unsigned long flags; 1207 1208 spin_lock_irqsave(&runtime->lock, flags); 1209 if (!substream->opened) 1210 result = -EBADFD; 1211 else { 1212 count = __snd_rawmidi_transmit_peek(substream, buffer, count); 1213 if (count <= 0) 1214 result = count; 1215 else 1216 result = __snd_rawmidi_transmit_ack(substream, count); 1217 } 1218 spin_unlock_irqrestore(&runtime->lock, flags); 1219 return result; 1220} 1221EXPORT_SYMBOL(snd_rawmidi_transmit); 1222 1223static long snd_rawmidi_kernel_write1(struct snd_rawmidi_substream *substream, 1224 const unsigned char __user *userbuf, 1225 const unsigned char *kernelbuf, 1226 long count) 1227{ 1228 unsigned long flags; 1229 long count1, result; 1230 struct snd_rawmidi_runtime *runtime = substream->runtime; 1231 unsigned long appl_ptr; 1232 1233 if (!kernelbuf && !userbuf) 1234 return -EINVAL; 1235 if (snd_BUG_ON(!runtime->buffer)) 1236 return -EINVAL; 1237 1238 result = 0; 1239 spin_lock_irqsave(&runtime->lock, flags); 1240 if (substream->append) { 1241 if ((long)runtime->avail < count) { 1242 spin_unlock_irqrestore(&runtime->lock, flags); 1243 return -EAGAIN; 1244 } 1245 } 1246 while (count > 0 && runtime->avail > 0) { 1247 count1 = runtime->buffer_size - runtime->appl_ptr; 1248 if (count1 > count) 1249 count1 = count; 1250 if (count1 > (long)runtime->avail) 1251 count1 = runtime->avail; 1252 1253 /* update runtime->appl_ptr before unlocking for userbuf */ 1254 appl_ptr = runtime->appl_ptr; 1255 runtime->appl_ptr += count1; 1256 runtime->appl_ptr %= runtime->buffer_size; 1257 runtime->avail -= count1; 1258 1259 if (kernelbuf) 1260 memcpy(runtime->buffer + appl_ptr, 1261 kernelbuf + result, count1); 1262 else if (userbuf) { 1263 spin_unlock_irqrestore(&runtime->lock, flags); 1264 if (copy_from_user(runtime->buffer + appl_ptr, 1265 userbuf + result, count1)) { 1266 spin_lock_irqsave(&runtime->lock, flags); 1267 result = result > 0 ? result : -EFAULT; 1268 goto __end; 1269 } 1270 spin_lock_irqsave(&runtime->lock, flags); 1271 } 1272 result += count1; 1273 count -= count1; 1274 } 1275 __end: 1276 count1 = runtime->avail < runtime->buffer_size; 1277 spin_unlock_irqrestore(&runtime->lock, flags); 1278 if (count1) 1279 snd_rawmidi_output_trigger(substream, 1); 1280 return result; 1281} 1282 1283long snd_rawmidi_kernel_write(struct snd_rawmidi_substream *substream, 1284 const unsigned char *buf, long count) 1285{ 1286 return snd_rawmidi_kernel_write1(substream, NULL, buf, count); 1287} 1288EXPORT_SYMBOL(snd_rawmidi_kernel_write); 1289 1290static ssize_t snd_rawmidi_write(struct file *file, const char __user *buf, 1291 size_t count, loff_t *offset) 1292{ 1293 long result, timeout; 1294 int count1; 1295 struct snd_rawmidi_file *rfile; 1296 struct snd_rawmidi_runtime *runtime; 1297 struct snd_rawmidi_substream *substream; 1298 1299 rfile = file->private_data; 1300 substream = rfile->output; 1301 runtime = substream->runtime; 1302 /* we cannot put an atomic message to our buffer */ 1303 if (substream->append && count > runtime->buffer_size) 1304 return -EIO; 1305 result = 0; 1306 while (count > 0) { 1307 spin_lock_irq(&runtime->lock); 1308 while (!snd_rawmidi_ready_append(substream, count)) { 1309 wait_queue_t wait; 1310 if (file->f_flags & O_NONBLOCK) { 1311 spin_unlock_irq(&runtime->lock); 1312 return result > 0 ? result : -EAGAIN; 1313 } 1314 init_waitqueue_entry(&wait, current); 1315 add_wait_queue(&runtime->sleep, &wait); 1316 set_current_state(TASK_INTERRUPTIBLE); 1317 spin_unlock_irq(&runtime->lock); 1318 timeout = schedule_timeout(30 * HZ); 1319 remove_wait_queue(&runtime->sleep, &wait); 1320 if (rfile->rmidi->card->shutdown) 1321 return -ENODEV; 1322 if (signal_pending(current)) 1323 return result > 0 ? result : -ERESTARTSYS; 1324 if (!runtime->avail && !timeout) 1325 return result > 0 ? result : -EIO; 1326 spin_lock_irq(&runtime->lock); 1327 } 1328 spin_unlock_irq(&runtime->lock); 1329 count1 = snd_rawmidi_kernel_write1(substream, buf, NULL, count); 1330 if (count1 < 0) 1331 return result > 0 ? result : count1; 1332 result += count1; 1333 buf += count1; 1334 if ((size_t)count1 < count && (file->f_flags & O_NONBLOCK)) 1335 break; 1336 count -= count1; 1337 } 1338 if (file->f_flags & O_DSYNC) { 1339 spin_lock_irq(&runtime->lock); 1340 while (runtime->avail != runtime->buffer_size) { 1341 wait_queue_t wait; 1342 unsigned int last_avail = runtime->avail; 1343 init_waitqueue_entry(&wait, current); 1344 add_wait_queue(&runtime->sleep, &wait); 1345 set_current_state(TASK_INTERRUPTIBLE); 1346 spin_unlock_irq(&runtime->lock); 1347 timeout = schedule_timeout(30 * HZ); 1348 remove_wait_queue(&runtime->sleep, &wait); 1349 if (signal_pending(current)) 1350 return result > 0 ? result : -ERESTARTSYS; 1351 if (runtime->avail == last_avail && !timeout) 1352 return result > 0 ? result : -EIO; 1353 spin_lock_irq(&runtime->lock); 1354 } 1355 spin_unlock_irq(&runtime->lock); 1356 } 1357 return result; 1358} 1359 1360static unsigned int snd_rawmidi_poll(struct file *file, poll_table * wait) 1361{ 1362 struct snd_rawmidi_file *rfile; 1363 struct snd_rawmidi_runtime *runtime; 1364 unsigned int mask; 1365 1366 rfile = file->private_data; 1367 if (rfile->input != NULL) { 1368 runtime = rfile->input->runtime; 1369 snd_rawmidi_input_trigger(rfile->input, 1); 1370 poll_wait(file, &runtime->sleep, wait); 1371 } 1372 if (rfile->output != NULL) { 1373 runtime = rfile->output->runtime; 1374 poll_wait(file, &runtime->sleep, wait); 1375 } 1376 mask = 0; 1377 if (rfile->input != NULL) { 1378 if (snd_rawmidi_ready(rfile->input)) 1379 mask |= POLLIN | POLLRDNORM; 1380 } 1381 if (rfile->output != NULL) { 1382 if (snd_rawmidi_ready(rfile->output)) 1383 mask |= POLLOUT | POLLWRNORM; 1384 } 1385 return mask; 1386} 1387 1388/* 1389 */ 1390#ifdef CONFIG_COMPAT 1391#include "rawmidi_compat.c" 1392#else 1393#define snd_rawmidi_ioctl_compat NULL 1394#endif 1395 1396/* 1397 1398 */ 1399 1400static void snd_rawmidi_proc_info_read(struct snd_info_entry *entry, 1401 struct snd_info_buffer *buffer) 1402{ 1403 struct snd_rawmidi *rmidi; 1404 struct snd_rawmidi_substream *substream; 1405 struct snd_rawmidi_runtime *runtime; 1406 1407 rmidi = entry->private_data; 1408 snd_iprintf(buffer, "%s\n\n", rmidi->name); 1409 mutex_lock(&rmidi->open_mutex); 1410 if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_OUTPUT) { 1411 list_for_each_entry(substream, 1412 &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams, 1413 list) { 1414 snd_iprintf(buffer, 1415 "Output %d\n" 1416 " Tx bytes : %lu\n", 1417 substream->number, 1418 (unsigned long) substream->bytes); 1419 if (substream->opened) { 1420 snd_iprintf(buffer, 1421 " Owner PID : %d\n", 1422 pid_vnr(substream->pid)); 1423 runtime = substream->runtime; 1424 snd_iprintf(buffer, 1425 " Mode : %s\n" 1426 " Buffer size : %lu\n" 1427 " Avail : %lu\n", 1428 runtime->oss ? "OSS compatible" : "native", 1429 (unsigned long) runtime->buffer_size, 1430 (unsigned long) runtime->avail); 1431 } 1432 } 1433 } 1434 if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_INPUT) { 1435 list_for_each_entry(substream, 1436 &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams, 1437 list) { 1438 snd_iprintf(buffer, 1439 "Input %d\n" 1440 " Rx bytes : %lu\n", 1441 substream->number, 1442 (unsigned long) substream->bytes); 1443 if (substream->opened) { 1444 snd_iprintf(buffer, 1445 " Owner PID : %d\n", 1446 pid_vnr(substream->pid)); 1447 runtime = substream->runtime; 1448 snd_iprintf(buffer, 1449 " Buffer size : %lu\n" 1450 " Avail : %lu\n" 1451 " Overruns : %lu\n", 1452 (unsigned long) runtime->buffer_size, 1453 (unsigned long) runtime->avail, 1454 (unsigned long) runtime->xruns); 1455 } 1456 } 1457 } 1458 mutex_unlock(&rmidi->open_mutex); 1459} 1460 1461/* 1462 * Register functions 1463 */ 1464 1465static const struct file_operations snd_rawmidi_f_ops = 1466{ 1467 .owner = THIS_MODULE, 1468 .read = snd_rawmidi_read, 1469 .write = snd_rawmidi_write, 1470 .open = snd_rawmidi_open, 1471 .release = snd_rawmidi_release, 1472 .llseek = no_llseek, 1473 .poll = snd_rawmidi_poll, 1474 .unlocked_ioctl = snd_rawmidi_ioctl, 1475 .compat_ioctl = snd_rawmidi_ioctl_compat, 1476}; 1477 1478static int snd_rawmidi_alloc_substreams(struct snd_rawmidi *rmidi, 1479 struct snd_rawmidi_str *stream, 1480 int direction, 1481 int count) 1482{ 1483 struct snd_rawmidi_substream *substream; 1484 int idx; 1485 1486 for (idx = 0; idx < count; idx++) { 1487 substream = kzalloc(sizeof(*substream), GFP_KERNEL); 1488 if (!substream) 1489 return -ENOMEM; 1490 substream->stream = direction; 1491 substream->number = idx; 1492 substream->rmidi = rmidi; 1493 substream->pstr = stream; 1494 list_add_tail(&substream->list, &stream->substreams); 1495 stream->substream_count++; 1496 } 1497 return 0; 1498} 1499 1500static void release_rawmidi_device(struct device *dev) 1501{ 1502 kfree(container_of(dev, struct snd_rawmidi, dev)); 1503} 1504 1505/** 1506 * snd_rawmidi_new - create a rawmidi instance 1507 * @card: the card instance 1508 * @id: the id string 1509 * @device: the device index 1510 * @output_count: the number of output streams 1511 * @input_count: the number of input streams 1512 * @rrawmidi: the pointer to store the new rawmidi instance 1513 * 1514 * Creates a new rawmidi instance. 1515 * Use snd_rawmidi_set_ops() to set the operators to the new instance. 1516 * 1517 * Return: Zero if successful, or a negative error code on failure. 1518 */ 1519int snd_rawmidi_new(struct snd_card *card, char *id, int device, 1520 int output_count, int input_count, 1521 struct snd_rawmidi ** rrawmidi) 1522{ 1523 struct snd_rawmidi *rmidi; 1524 int err; 1525 static struct snd_device_ops ops = { 1526 .dev_free = snd_rawmidi_dev_free, 1527 .dev_register = snd_rawmidi_dev_register, 1528 .dev_disconnect = snd_rawmidi_dev_disconnect, 1529 }; 1530 1531 if (snd_BUG_ON(!card)) 1532 return -ENXIO; 1533 if (rrawmidi) 1534 *rrawmidi = NULL; 1535 rmidi = kzalloc(sizeof(*rmidi), GFP_KERNEL); 1536 if (!rmidi) 1537 return -ENOMEM; 1538 rmidi->card = card; 1539 rmidi->device = device; 1540 mutex_init(&rmidi->open_mutex); 1541 init_waitqueue_head(&rmidi->open_wait); 1542 INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams); 1543 INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams); 1544 1545 if (id != NULL) 1546 strlcpy(rmidi->id, id, sizeof(rmidi->id)); 1547 1548 snd_device_initialize(&rmidi->dev, card); 1549 rmidi->dev.release = release_rawmidi_device; 1550 dev_set_name(&rmidi->dev, "midiC%iD%i", card->number, device); 1551 1552 if ((err = snd_rawmidi_alloc_substreams(rmidi, 1553 &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT], 1554 SNDRV_RAWMIDI_STREAM_INPUT, 1555 input_count)) < 0) { 1556 snd_rawmidi_free(rmidi); 1557 return err; 1558 } 1559 if ((err = snd_rawmidi_alloc_substreams(rmidi, 1560 &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT], 1561 SNDRV_RAWMIDI_STREAM_OUTPUT, 1562 output_count)) < 0) { 1563 snd_rawmidi_free(rmidi); 1564 return err; 1565 } 1566 if ((err = snd_device_new(card, SNDRV_DEV_RAWMIDI, rmidi, &ops)) < 0) { 1567 snd_rawmidi_free(rmidi); 1568 return err; 1569 } 1570 if (rrawmidi) 1571 *rrawmidi = rmidi; 1572 return 0; 1573} 1574EXPORT_SYMBOL(snd_rawmidi_new); 1575 1576static void snd_rawmidi_free_substreams(struct snd_rawmidi_str *stream) 1577{ 1578 struct snd_rawmidi_substream *substream; 1579 1580 while (!list_empty(&stream->substreams)) { 1581 substream = list_entry(stream->substreams.next, struct snd_rawmidi_substream, list); 1582 list_del(&substream->list); 1583 kfree(substream); 1584 } 1585} 1586 1587static int snd_rawmidi_free(struct snd_rawmidi *rmidi) 1588{ 1589 if (!rmidi) 1590 return 0; 1591 1592 snd_info_free_entry(rmidi->proc_entry); 1593 rmidi->proc_entry = NULL; 1594 mutex_lock(®ister_mutex); 1595 if (rmidi->ops && rmidi->ops->dev_unregister) 1596 rmidi->ops->dev_unregister(rmidi); 1597 mutex_unlock(®ister_mutex); 1598 1599 snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT]); 1600 snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT]); 1601 if (rmidi->private_free) 1602 rmidi->private_free(rmidi); 1603 put_device(&rmidi->dev); 1604 return 0; 1605} 1606 1607static int snd_rawmidi_dev_free(struct snd_device *device) 1608{ 1609 struct snd_rawmidi *rmidi = device->device_data; 1610 return snd_rawmidi_free(rmidi); 1611} 1612 1613#if defined(CONFIG_SND_SEQUENCER) || (defined(MODULE) && defined(CONFIG_SND_SEQUENCER_MODULE)) 1614static void snd_rawmidi_dev_seq_free(struct snd_seq_device *device) 1615{ 1616 struct snd_rawmidi *rmidi = device->private_data; 1617 rmidi->seq_dev = NULL; 1618} 1619#endif 1620 1621static int snd_rawmidi_dev_register(struct snd_device *device) 1622{ 1623 int err; 1624 struct snd_info_entry *entry; 1625 char name[16]; 1626 struct snd_rawmidi *rmidi = device->device_data; 1627 1628 if (rmidi->device >= SNDRV_RAWMIDI_DEVICES) 1629 return -ENOMEM; 1630 mutex_lock(®ister_mutex); 1631 if (snd_rawmidi_search(rmidi->card, rmidi->device)) { 1632 mutex_unlock(®ister_mutex); 1633 return -EBUSY; 1634 } 1635 list_add_tail(&rmidi->list, &snd_rawmidi_devices); 1636 err = snd_register_device(SNDRV_DEVICE_TYPE_RAWMIDI, 1637 rmidi->card, rmidi->device, 1638 &snd_rawmidi_f_ops, rmidi, &rmidi->dev); 1639 if (err < 0) { 1640 rmidi_err(rmidi, "unable to register\n"); 1641 list_del(&rmidi->list); 1642 mutex_unlock(®ister_mutex); 1643 return err; 1644 } 1645 if (rmidi->ops && rmidi->ops->dev_register && 1646 (err = rmidi->ops->dev_register(rmidi)) < 0) { 1647 snd_unregister_device(&rmidi->dev); 1648 list_del(&rmidi->list); 1649 mutex_unlock(®ister_mutex); 1650 return err; 1651 } 1652#ifdef CONFIG_SND_OSSEMUL 1653 rmidi->ossreg = 0; 1654 if ((int)rmidi->device == midi_map[rmidi->card->number]) { 1655 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, 1656 rmidi->card, 0, &snd_rawmidi_f_ops, 1657 rmidi) < 0) { 1658 rmidi_err(rmidi, 1659 "unable to register OSS rawmidi device %i:%i\n", 1660 rmidi->card->number, 0); 1661 } else { 1662 rmidi->ossreg++; 1663#ifdef SNDRV_OSS_INFO_DEV_MIDI 1664 snd_oss_info_register(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number, rmidi->name); 1665#endif 1666 } 1667 } 1668 if ((int)rmidi->device == amidi_map[rmidi->card->number]) { 1669 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, 1670 rmidi->card, 1, &snd_rawmidi_f_ops, 1671 rmidi) < 0) { 1672 rmidi_err(rmidi, 1673 "unable to register OSS rawmidi device %i:%i\n", 1674 rmidi->card->number, 1); 1675 } else { 1676 rmidi->ossreg++; 1677 } 1678 } 1679#endif /* CONFIG_SND_OSSEMUL */ 1680 mutex_unlock(®ister_mutex); 1681 sprintf(name, "midi%d", rmidi->device); 1682 entry = snd_info_create_card_entry(rmidi->card, name, rmidi->card->proc_root); 1683 if (entry) { 1684 entry->private_data = rmidi; 1685 entry->c.text.read = snd_rawmidi_proc_info_read; 1686 if (snd_info_register(entry) < 0) { 1687 snd_info_free_entry(entry); 1688 entry = NULL; 1689 } 1690 } 1691 rmidi->proc_entry = entry; 1692#if defined(CONFIG_SND_SEQUENCER) || (defined(MODULE) && defined(CONFIG_SND_SEQUENCER_MODULE)) 1693 if (!rmidi->ops || !rmidi->ops->dev_register) { /* own registration mechanism */ 1694 if (snd_seq_device_new(rmidi->card, rmidi->device, SNDRV_SEQ_DEV_ID_MIDISYNTH, 0, &rmidi->seq_dev) >= 0) { 1695 rmidi->seq_dev->private_data = rmidi; 1696 rmidi->seq_dev->private_free = snd_rawmidi_dev_seq_free; 1697 sprintf(rmidi->seq_dev->name, "MIDI %d-%d", rmidi->card->number, rmidi->device); 1698 snd_device_register(rmidi->card, rmidi->seq_dev); 1699 } 1700 } 1701#endif 1702 return 0; 1703} 1704 1705static int snd_rawmidi_dev_disconnect(struct snd_device *device) 1706{ 1707 struct snd_rawmidi *rmidi = device->device_data; 1708 int dir; 1709 1710 mutex_lock(®ister_mutex); 1711 mutex_lock(&rmidi->open_mutex); 1712 wake_up(&rmidi->open_wait); 1713 list_del_init(&rmidi->list); 1714 for (dir = 0; dir < 2; dir++) { 1715 struct snd_rawmidi_substream *s; 1716 list_for_each_entry(s, &rmidi->streams[dir].substreams, list) { 1717 if (s->runtime) 1718 wake_up(&s->runtime->sleep); 1719 } 1720 } 1721 1722#ifdef CONFIG_SND_OSSEMUL 1723 if (rmidi->ossreg) { 1724 if ((int)rmidi->device == midi_map[rmidi->card->number]) { 1725 snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 0); 1726#ifdef SNDRV_OSS_INFO_DEV_MIDI 1727 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number); 1728#endif 1729 } 1730 if ((int)rmidi->device == amidi_map[rmidi->card->number]) 1731 snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 1); 1732 rmidi->ossreg = 0; 1733 } 1734#endif /* CONFIG_SND_OSSEMUL */ 1735 snd_unregister_device(&rmidi->dev); 1736 mutex_unlock(&rmidi->open_mutex); 1737 mutex_unlock(®ister_mutex); 1738 return 0; 1739} 1740 1741/** 1742 * snd_rawmidi_set_ops - set the rawmidi operators 1743 * @rmidi: the rawmidi instance 1744 * @stream: the stream direction, SNDRV_RAWMIDI_STREAM_XXX 1745 * @ops: the operator table 1746 * 1747 * Sets the rawmidi operators for the given stream direction. 1748 */ 1749void snd_rawmidi_set_ops(struct snd_rawmidi *rmidi, int stream, 1750 struct snd_rawmidi_ops *ops) 1751{ 1752 struct snd_rawmidi_substream *substream; 1753 1754 list_for_each_entry(substream, &rmidi->streams[stream].substreams, list) 1755 substream->ops = ops; 1756} 1757EXPORT_SYMBOL(snd_rawmidi_set_ops); 1758 1759/* 1760 * ENTRY functions 1761 */ 1762 1763static int __init alsa_rawmidi_init(void) 1764{ 1765 1766 snd_ctl_register_ioctl(snd_rawmidi_control_ioctl); 1767 snd_ctl_register_ioctl_compat(snd_rawmidi_control_ioctl); 1768#ifdef CONFIG_SND_OSSEMUL 1769 { int i; 1770 /* check device map table */ 1771 for (i = 0; i < SNDRV_CARDS; i++) { 1772 if (midi_map[i] < 0 || midi_map[i] >= SNDRV_RAWMIDI_DEVICES) { 1773 pr_err("ALSA: rawmidi: invalid midi_map[%d] = %d\n", 1774 i, midi_map[i]); 1775 midi_map[i] = 0; 1776 } 1777 if (amidi_map[i] < 0 || amidi_map[i] >= SNDRV_RAWMIDI_DEVICES) { 1778 pr_err("ALSA: rawmidi: invalid amidi_map[%d] = %d\n", 1779 i, amidi_map[i]); 1780 amidi_map[i] = 1; 1781 } 1782 } 1783 } 1784#endif /* CONFIG_SND_OSSEMUL */ 1785 return 0; 1786} 1787 1788static void __exit alsa_rawmidi_exit(void) 1789{ 1790 snd_ctl_unregister_ioctl(snd_rawmidi_control_ioctl); 1791 snd_ctl_unregister_ioctl_compat(snd_rawmidi_control_ioctl); 1792} 1793 1794module_init(alsa_rawmidi_init) 1795module_exit(alsa_rawmidi_exit) 1796