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