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