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 err = nonseekable_open(inode, file); 380 if (err < 0) 381 return err; 382 383 if (maj == snd_major) { 384 rmidi = snd_lookup_minor_data(iminor(inode), 385 SNDRV_DEVICE_TYPE_RAWMIDI); 386 #ifdef CONFIG_SND_OSSEMUL 387 } else if (maj == SOUND_MAJOR) { 388 rmidi = snd_lookup_oss_minor_data(iminor(inode), 389 SNDRV_OSS_DEVICE_TYPE_MIDI); 390 #endif 391 } else 392 return -ENXIO; 393 394 if (rmidi == NULL) 395 return -ENODEV; 396 397 if (!try_module_get(rmidi->card->module)) 398 return -ENXIO; 399 400 mutex_lock(&rmidi->open_mutex); 401 card = rmidi->card; 402 err = snd_card_file_add(card, file); 403 if (err < 0) 404 goto __error_card; 405 fflags = snd_rawmidi_file_flags(file); 406 if ((file->f_flags & O_APPEND) || maj == SOUND_MAJOR) /* OSS emul? */ 407 fflags |= SNDRV_RAWMIDI_LFLG_APPEND; 408 rawmidi_file = kmalloc(sizeof(*rawmidi_file), GFP_KERNEL); 409 if (rawmidi_file == NULL) { 410 err = -ENOMEM; 411 goto __error; 412 } 413 init_waitqueue_entry(&wait, current); 414 add_wait_queue(&rmidi->open_wait, &wait); 415 while (1) { 416 subdevice = -1; 417 read_lock(&card->ctl_files_rwlock); 418 list_for_each_entry(kctl, &card->ctl_files, list) { 419 if (kctl->pid == task_pid(current)) { 420 subdevice = kctl->prefer_rawmidi_subdevice; 421 if (subdevice != -1) 422 break; 423 } 424 } 425 read_unlock(&card->ctl_files_rwlock); 426 err = rawmidi_open_priv(rmidi, subdevice, fflags, rawmidi_file); 427 if (err >= 0) 428 break; 429 if (err == -EAGAIN) { 430 if (file->f_flags & O_NONBLOCK) { 431 err = -EBUSY; 432 break; 433 } 434 } else 435 break; 436 set_current_state(TASK_INTERRUPTIBLE); 437 mutex_unlock(&rmidi->open_mutex); 438 schedule(); 439 mutex_lock(&rmidi->open_mutex); 440 if (signal_pending(current)) { 441 err = -ERESTARTSYS; 442 break; 443 } 444 } 445 remove_wait_queue(&rmidi->open_wait, &wait); 446 if (err < 0) { 447 kfree(rawmidi_file); 448 goto __error; 449 } 450 #ifdef CONFIG_SND_OSSEMUL 451 if (rawmidi_file->input && rawmidi_file->input->runtime) 452 rawmidi_file->input->runtime->oss = (maj == SOUND_MAJOR); 453 if (rawmidi_file->output && rawmidi_file->output->runtime) 454 rawmidi_file->output->runtime->oss = (maj == SOUND_MAJOR); 455 #endif 456 file->private_data = rawmidi_file; 457 mutex_unlock(&rmidi->open_mutex); 458 return 0; 459 460 __error: 461 snd_card_file_remove(card, file); 462 __error_card: 463 mutex_unlock(&rmidi->open_mutex); 464 module_put(rmidi->card->module); 465 return err; 466 } 467 468 static void close_substream(struct snd_rawmidi *rmidi, 469 struct snd_rawmidi_substream *substream, 470 int cleanup) 471 { 472 if (--substream->use_count) 473 return; 474 475 if (cleanup) { 476 if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT) 477 snd_rawmidi_input_trigger(substream, 0); 478 else { 479 if (substream->active_sensing) { 480 unsigned char buf = 0xfe; 481 /* sending single active sensing message 482 * to shut the device up 483 */ 484 snd_rawmidi_kernel_write(substream, &buf, 1); 485 } 486 if (snd_rawmidi_drain_output(substream) == -ERESTARTSYS) 487 snd_rawmidi_output_trigger(substream, 0); 488 } 489 } 490 substream->ops->close(substream); 491 if (substream->runtime->private_free) 492 substream->runtime->private_free(substream); 493 snd_rawmidi_runtime_free(substream); 494 substream->opened = 0; 495 substream->append = 0; 496 put_pid(substream->pid); 497 substream->pid = NULL; 498 rmidi->streams[substream->stream].substream_opened--; 499 } 500 501 static void rawmidi_release_priv(struct snd_rawmidi_file *rfile) 502 { 503 struct snd_rawmidi *rmidi; 504 505 rmidi = rfile->rmidi; 506 mutex_lock(&rmidi->open_mutex); 507 if (rfile->input) { 508 close_substream(rmidi, rfile->input, 1); 509 rfile->input = NULL; 510 } 511 if (rfile->output) { 512 close_substream(rmidi, rfile->output, 1); 513 rfile->output = NULL; 514 } 515 rfile->rmidi = NULL; 516 mutex_unlock(&rmidi->open_mutex); 517 wake_up(&rmidi->open_wait); 518 } 519 520 /* called from sound/core/seq/seq_midi.c */ 521 int snd_rawmidi_kernel_release(struct snd_rawmidi_file *rfile) 522 { 523 struct snd_rawmidi *rmidi; 524 525 if (snd_BUG_ON(!rfile)) 526 return -ENXIO; 527 528 rmidi = rfile->rmidi; 529 rawmidi_release_priv(rfile); 530 module_put(rmidi->card->module); 531 return 0; 532 } 533 534 static int snd_rawmidi_release(struct inode *inode, struct file *file) 535 { 536 struct snd_rawmidi_file *rfile; 537 struct snd_rawmidi *rmidi; 538 539 rfile = file->private_data; 540 rmidi = rfile->rmidi; 541 rawmidi_release_priv(rfile); 542 kfree(rfile); 543 snd_card_file_remove(rmidi->card, file); 544 module_put(rmidi->card->module); 545 return 0; 546 } 547 548 static int snd_rawmidi_info(struct snd_rawmidi_substream *substream, 549 struct snd_rawmidi_info *info) 550 { 551 struct snd_rawmidi *rmidi; 552 553 if (substream == NULL) 554 return -ENODEV; 555 rmidi = substream->rmidi; 556 memset(info, 0, sizeof(*info)); 557 info->card = rmidi->card->number; 558 info->device = rmidi->device; 559 info->subdevice = substream->number; 560 info->stream = substream->stream; 561 info->flags = rmidi->info_flags; 562 strcpy(info->id, rmidi->id); 563 strcpy(info->name, rmidi->name); 564 strcpy(info->subname, substream->name); 565 info->subdevices_count = substream->pstr->substream_count; 566 info->subdevices_avail = (substream->pstr->substream_count - 567 substream->pstr->substream_opened); 568 return 0; 569 } 570 571 static int snd_rawmidi_info_user(struct snd_rawmidi_substream *substream, 572 struct snd_rawmidi_info __user * _info) 573 { 574 struct snd_rawmidi_info info; 575 int err; 576 if ((err = snd_rawmidi_info(substream, &info)) < 0) 577 return err; 578 if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info))) 579 return -EFAULT; 580 return 0; 581 } 582 583 int snd_rawmidi_info_select(struct snd_card *card, struct snd_rawmidi_info *info) 584 { 585 struct snd_rawmidi *rmidi; 586 struct snd_rawmidi_str *pstr; 587 struct snd_rawmidi_substream *substream; 588 589 mutex_lock(®ister_mutex); 590 rmidi = snd_rawmidi_search(card, info->device); 591 mutex_unlock(®ister_mutex); 592 if (!rmidi) 593 return -ENXIO; 594 if (info->stream < 0 || info->stream > 1) 595 return -EINVAL; 596 pstr = &rmidi->streams[info->stream]; 597 if (pstr->substream_count == 0) 598 return -ENOENT; 599 if (info->subdevice >= pstr->substream_count) 600 return -ENXIO; 601 list_for_each_entry(substream, &pstr->substreams, list) { 602 if ((unsigned int)substream->number == info->subdevice) 603 return snd_rawmidi_info(substream, info); 604 } 605 return -ENXIO; 606 } 607 608 static int snd_rawmidi_info_select_user(struct snd_card *card, 609 struct snd_rawmidi_info __user *_info) 610 { 611 int err; 612 struct snd_rawmidi_info info; 613 if (get_user(info.device, &_info->device)) 614 return -EFAULT; 615 if (get_user(info.stream, &_info->stream)) 616 return -EFAULT; 617 if (get_user(info.subdevice, &_info->subdevice)) 618 return -EFAULT; 619 if ((err = snd_rawmidi_info_select(card, &info)) < 0) 620 return err; 621 if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info))) 622 return -EFAULT; 623 return 0; 624 } 625 626 int snd_rawmidi_output_params(struct snd_rawmidi_substream *substream, 627 struct snd_rawmidi_params * params) 628 { 629 char *newbuf; 630 struct snd_rawmidi_runtime *runtime = substream->runtime; 631 632 if (substream->append && substream->use_count > 1) 633 return -EBUSY; 634 snd_rawmidi_drain_output(substream); 635 if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L) { 636 return -EINVAL; 637 } 638 if (params->avail_min < 1 || params->avail_min > params->buffer_size) { 639 return -EINVAL; 640 } 641 if (params->buffer_size != runtime->buffer_size) { 642 newbuf = kmalloc(params->buffer_size, GFP_KERNEL); 643 if (!newbuf) 644 return -ENOMEM; 645 kfree(runtime->buffer); 646 runtime->buffer = newbuf; 647 runtime->buffer_size = params->buffer_size; 648 runtime->avail = runtime->buffer_size; 649 } 650 runtime->avail_min = params->avail_min; 651 substream->active_sensing = !params->no_active_sensing; 652 return 0; 653 } 654 655 int snd_rawmidi_input_params(struct snd_rawmidi_substream *substream, 656 struct snd_rawmidi_params * params) 657 { 658 char *newbuf; 659 struct snd_rawmidi_runtime *runtime = substream->runtime; 660 661 snd_rawmidi_drain_input(substream); 662 if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L) { 663 return -EINVAL; 664 } 665 if (params->avail_min < 1 || params->avail_min > params->buffer_size) { 666 return -EINVAL; 667 } 668 if (params->buffer_size != runtime->buffer_size) { 669 newbuf = kmalloc(params->buffer_size, GFP_KERNEL); 670 if (!newbuf) 671 return -ENOMEM; 672 kfree(runtime->buffer); 673 runtime->buffer = newbuf; 674 runtime->buffer_size = params->buffer_size; 675 } 676 runtime->avail_min = params->avail_min; 677 return 0; 678 } 679 680 static int snd_rawmidi_output_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_OUTPUT; 687 spin_lock_irq(&runtime->lock); 688 status->avail = runtime->avail; 689 spin_unlock_irq(&runtime->lock); 690 return 0; 691 } 692 693 static int snd_rawmidi_input_status(struct snd_rawmidi_substream *substream, 694 struct snd_rawmidi_status * status) 695 { 696 struct snd_rawmidi_runtime *runtime = substream->runtime; 697 698 memset(status, 0, sizeof(*status)); 699 status->stream = SNDRV_RAWMIDI_STREAM_INPUT; 700 spin_lock_irq(&runtime->lock); 701 status->avail = runtime->avail; 702 status->xruns = runtime->xruns; 703 runtime->xruns = 0; 704 spin_unlock_irq(&runtime->lock); 705 return 0; 706 } 707 708 static long snd_rawmidi_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 709 { 710 struct snd_rawmidi_file *rfile; 711 void __user *argp = (void __user *)arg; 712 713 rfile = file->private_data; 714 if (((cmd >> 8) & 0xff) != 'W') 715 return -ENOTTY; 716 switch (cmd) { 717 case SNDRV_RAWMIDI_IOCTL_PVERSION: 718 return put_user(SNDRV_RAWMIDI_VERSION, (int __user *)argp) ? -EFAULT : 0; 719 case SNDRV_RAWMIDI_IOCTL_INFO: 720 { 721 int stream; 722 struct snd_rawmidi_info __user *info = argp; 723 if (get_user(stream, &info->stream)) 724 return -EFAULT; 725 switch (stream) { 726 case SNDRV_RAWMIDI_STREAM_INPUT: 727 return snd_rawmidi_info_user(rfile->input, info); 728 case SNDRV_RAWMIDI_STREAM_OUTPUT: 729 return snd_rawmidi_info_user(rfile->output, info); 730 default: 731 return -EINVAL; 732 } 733 } 734 case SNDRV_RAWMIDI_IOCTL_PARAMS: 735 { 736 struct snd_rawmidi_params params; 737 if (copy_from_user(¶ms, argp, sizeof(struct snd_rawmidi_params))) 738 return -EFAULT; 739 switch (params.stream) { 740 case SNDRV_RAWMIDI_STREAM_OUTPUT: 741 if (rfile->output == NULL) 742 return -EINVAL; 743 return snd_rawmidi_output_params(rfile->output, ¶ms); 744 case SNDRV_RAWMIDI_STREAM_INPUT: 745 if (rfile->input == NULL) 746 return -EINVAL; 747 return snd_rawmidi_input_params(rfile->input, ¶ms); 748 default: 749 return -EINVAL; 750 } 751 } 752 case SNDRV_RAWMIDI_IOCTL_STATUS: 753 { 754 int err = 0; 755 struct snd_rawmidi_status status; 756 if (copy_from_user(&status, argp, sizeof(struct snd_rawmidi_status))) 757 return -EFAULT; 758 switch (status.stream) { 759 case SNDRV_RAWMIDI_STREAM_OUTPUT: 760 if (rfile->output == NULL) 761 return -EINVAL; 762 err = snd_rawmidi_output_status(rfile->output, &status); 763 break; 764 case SNDRV_RAWMIDI_STREAM_INPUT: 765 if (rfile->input == NULL) 766 return -EINVAL; 767 err = snd_rawmidi_input_status(rfile->input, &status); 768 break; 769 default: 770 return -EINVAL; 771 } 772 if (err < 0) 773 return err; 774 if (copy_to_user(argp, &status, sizeof(struct snd_rawmidi_status))) 775 return -EFAULT; 776 return 0; 777 } 778 case SNDRV_RAWMIDI_IOCTL_DROP: 779 { 780 int val; 781 if (get_user(val, (int __user *) argp)) 782 return -EFAULT; 783 switch (val) { 784 case SNDRV_RAWMIDI_STREAM_OUTPUT: 785 if (rfile->output == NULL) 786 return -EINVAL; 787 return snd_rawmidi_drop_output(rfile->output); 788 default: 789 return -EINVAL; 790 } 791 } 792 case SNDRV_RAWMIDI_IOCTL_DRAIN: 793 { 794 int val; 795 if (get_user(val, (int __user *) argp)) 796 return -EFAULT; 797 switch (val) { 798 case SNDRV_RAWMIDI_STREAM_OUTPUT: 799 if (rfile->output == NULL) 800 return -EINVAL; 801 return snd_rawmidi_drain_output(rfile->output); 802 case SNDRV_RAWMIDI_STREAM_INPUT: 803 if (rfile->input == NULL) 804 return -EINVAL; 805 return snd_rawmidi_drain_input(rfile->input); 806 default: 807 return -EINVAL; 808 } 809 } 810 #ifdef CONFIG_SND_DEBUG 811 default: 812 snd_printk(KERN_WARNING "rawmidi: unknown command = 0x%x\n", cmd); 813 #endif 814 } 815 return -ENOTTY; 816 } 817 818 static int snd_rawmidi_control_ioctl(struct snd_card *card, 819 struct snd_ctl_file *control, 820 unsigned int cmd, 821 unsigned long arg) 822 { 823 void __user *argp = (void __user *)arg; 824 825 switch (cmd) { 826 case SNDRV_CTL_IOCTL_RAWMIDI_NEXT_DEVICE: 827 { 828 int device; 829 830 if (get_user(device, (int __user *)argp)) 831 return -EFAULT; 832 mutex_lock(®ister_mutex); 833 device = device < 0 ? 0 : device + 1; 834 while (device < SNDRV_RAWMIDI_DEVICES) { 835 if (snd_rawmidi_search(card, device)) 836 break; 837 device++; 838 } 839 if (device == SNDRV_RAWMIDI_DEVICES) 840 device = -1; 841 mutex_unlock(®ister_mutex); 842 if (put_user(device, (int __user *)argp)) 843 return -EFAULT; 844 return 0; 845 } 846 case SNDRV_CTL_IOCTL_RAWMIDI_PREFER_SUBDEVICE: 847 { 848 int val; 849 850 if (get_user(val, (int __user *)argp)) 851 return -EFAULT; 852 control->prefer_rawmidi_subdevice = val; 853 return 0; 854 } 855 case SNDRV_CTL_IOCTL_RAWMIDI_INFO: 856 return snd_rawmidi_info_select_user(card, argp); 857 } 858 return -ENOIOCTLCMD; 859 } 860 861 /** 862 * snd_rawmidi_receive - receive the input data from the device 863 * @substream: the rawmidi substream 864 * @buffer: the buffer pointer 865 * @count: the data size to read 866 * 867 * Reads the data from the internal buffer. 868 * 869 * Returns the size of read data, or a negative error code on failure. 870 */ 871 int snd_rawmidi_receive(struct snd_rawmidi_substream *substream, 872 const unsigned char *buffer, int count) 873 { 874 unsigned long flags; 875 int result = 0, count1; 876 struct snd_rawmidi_runtime *runtime = substream->runtime; 877 878 if (!substream->opened) 879 return -EBADFD; 880 if (runtime->buffer == NULL) { 881 snd_printd("snd_rawmidi_receive: input is not active!!!\n"); 882 return -EINVAL; 883 } 884 spin_lock_irqsave(&runtime->lock, flags); 885 if (count == 1) { /* special case, faster code */ 886 substream->bytes++; 887 if (runtime->avail < runtime->buffer_size) { 888 runtime->buffer[runtime->hw_ptr++] = buffer[0]; 889 runtime->hw_ptr %= runtime->buffer_size; 890 runtime->avail++; 891 result++; 892 } else { 893 runtime->xruns++; 894 } 895 } else { 896 substream->bytes += count; 897 count1 = runtime->buffer_size - runtime->hw_ptr; 898 if (count1 > count) 899 count1 = count; 900 if (count1 > (int)(runtime->buffer_size - runtime->avail)) 901 count1 = runtime->buffer_size - runtime->avail; 902 memcpy(runtime->buffer + runtime->hw_ptr, buffer, count1); 903 runtime->hw_ptr += count1; 904 runtime->hw_ptr %= runtime->buffer_size; 905 runtime->avail += count1; 906 count -= count1; 907 result += count1; 908 if (count > 0) { 909 buffer += count1; 910 count1 = count; 911 if (count1 > (int)(runtime->buffer_size - runtime->avail)) { 912 count1 = runtime->buffer_size - runtime->avail; 913 runtime->xruns += count - count1; 914 } 915 if (count1 > 0) { 916 memcpy(runtime->buffer, buffer, count1); 917 runtime->hw_ptr = count1; 918 runtime->avail += count1; 919 result += count1; 920 } 921 } 922 } 923 if (result > 0) { 924 if (runtime->event) 925 tasklet_schedule(&runtime->tasklet); 926 else if (snd_rawmidi_ready(substream)) 927 wake_up(&runtime->sleep); 928 } 929 spin_unlock_irqrestore(&runtime->lock, flags); 930 return result; 931 } 932 933 static long snd_rawmidi_kernel_read1(struct snd_rawmidi_substream *substream, 934 unsigned char __user *userbuf, 935 unsigned char *kernelbuf, long count) 936 { 937 unsigned long flags; 938 long result = 0, count1; 939 struct snd_rawmidi_runtime *runtime = substream->runtime; 940 941 while (count > 0 && runtime->avail) { 942 count1 = runtime->buffer_size - runtime->appl_ptr; 943 if (count1 > count) 944 count1 = count; 945 spin_lock_irqsave(&runtime->lock, flags); 946 if (count1 > (int)runtime->avail) 947 count1 = runtime->avail; 948 if (kernelbuf) 949 memcpy(kernelbuf + result, runtime->buffer + runtime->appl_ptr, count1); 950 if (userbuf) { 951 spin_unlock_irqrestore(&runtime->lock, flags); 952 if (copy_to_user(userbuf + result, 953 runtime->buffer + runtime->appl_ptr, count1)) { 954 return result > 0 ? result : -EFAULT; 955 } 956 spin_lock_irqsave(&runtime->lock, flags); 957 } 958 runtime->appl_ptr += count1; 959 runtime->appl_ptr %= runtime->buffer_size; 960 runtime->avail -= count1; 961 spin_unlock_irqrestore(&runtime->lock, flags); 962 result += count1; 963 count -= count1; 964 } 965 return result; 966 } 967 968 long snd_rawmidi_kernel_read(struct snd_rawmidi_substream *substream, 969 unsigned char *buf, long count) 970 { 971 snd_rawmidi_input_trigger(substream, 1); 972 return snd_rawmidi_kernel_read1(substream, NULL/*userbuf*/, buf, count); 973 } 974 975 static ssize_t snd_rawmidi_read(struct file *file, char __user *buf, size_t count, 976 loff_t *offset) 977 { 978 long result; 979 int count1; 980 struct snd_rawmidi_file *rfile; 981 struct snd_rawmidi_substream *substream; 982 struct snd_rawmidi_runtime *runtime; 983 984 rfile = file->private_data; 985 substream = rfile->input; 986 if (substream == NULL) 987 return -EIO; 988 runtime = substream->runtime; 989 snd_rawmidi_input_trigger(substream, 1); 990 result = 0; 991 while (count > 0) { 992 spin_lock_irq(&runtime->lock); 993 while (!snd_rawmidi_ready(substream)) { 994 wait_queue_t wait; 995 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) { 996 spin_unlock_irq(&runtime->lock); 997 return result > 0 ? result : -EAGAIN; 998 } 999 init_waitqueue_entry(&wait, current); 1000 add_wait_queue(&runtime->sleep, &wait); 1001 set_current_state(TASK_INTERRUPTIBLE); 1002 spin_unlock_irq(&runtime->lock); 1003 schedule(); 1004 remove_wait_queue(&runtime->sleep, &wait); 1005 if (signal_pending(current)) 1006 return result > 0 ? result : -ERESTARTSYS; 1007 if (!runtime->avail) 1008 return result > 0 ? result : -EIO; 1009 spin_lock_irq(&runtime->lock); 1010 } 1011 spin_unlock_irq(&runtime->lock); 1012 count1 = snd_rawmidi_kernel_read1(substream, 1013 (unsigned char __user *)buf, 1014 NULL/*kernelbuf*/, 1015 count); 1016 if (count1 < 0) 1017 return result > 0 ? result : count1; 1018 result += count1; 1019 buf += count1; 1020 count -= count1; 1021 } 1022 return result; 1023 } 1024 1025 /** 1026 * snd_rawmidi_transmit_empty - check whether the output buffer is empty 1027 * @substream: the rawmidi substream 1028 * 1029 * Returns 1 if the internal output buffer is empty, 0 if not. 1030 */ 1031 int snd_rawmidi_transmit_empty(struct snd_rawmidi_substream *substream) 1032 { 1033 struct snd_rawmidi_runtime *runtime = substream->runtime; 1034 int result; 1035 unsigned long flags; 1036 1037 if (runtime->buffer == NULL) { 1038 snd_printd("snd_rawmidi_transmit_empty: output is not active!!!\n"); 1039 return 1; 1040 } 1041 spin_lock_irqsave(&runtime->lock, flags); 1042 result = runtime->avail >= runtime->buffer_size; 1043 spin_unlock_irqrestore(&runtime->lock, flags); 1044 return result; 1045 } 1046 1047 /** 1048 * snd_rawmidi_transmit_peek - copy data from the internal buffer 1049 * @substream: the rawmidi substream 1050 * @buffer: the buffer pointer 1051 * @count: data size to transfer 1052 * 1053 * Copies data from the internal output buffer to the given buffer. 1054 * 1055 * Call this in the interrupt handler when the midi output is ready, 1056 * and call snd_rawmidi_transmit_ack() after the transmission is 1057 * finished. 1058 * 1059 * Returns the size of copied data, or a negative error code on failure. 1060 */ 1061 int snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream, 1062 unsigned char *buffer, int count) 1063 { 1064 unsigned long flags; 1065 int result, count1; 1066 struct snd_rawmidi_runtime *runtime = substream->runtime; 1067 1068 if (runtime->buffer == NULL) { 1069 snd_printd("snd_rawmidi_transmit_peek: output is not active!!!\n"); 1070 return -EINVAL; 1071 } 1072 result = 0; 1073 spin_lock_irqsave(&runtime->lock, flags); 1074 if (runtime->avail >= runtime->buffer_size) { 1075 /* warning: lowlevel layer MUST trigger down the hardware */ 1076 goto __skip; 1077 } 1078 if (count == 1) { /* special case, faster code */ 1079 *buffer = runtime->buffer[runtime->hw_ptr]; 1080 result++; 1081 } else { 1082 count1 = runtime->buffer_size - runtime->hw_ptr; 1083 if (count1 > count) 1084 count1 = count; 1085 if (count1 > (int)(runtime->buffer_size - runtime->avail)) 1086 count1 = runtime->buffer_size - runtime->avail; 1087 memcpy(buffer, runtime->buffer + runtime->hw_ptr, count1); 1088 count -= count1; 1089 result += count1; 1090 if (count > 0) { 1091 if (count > (int)(runtime->buffer_size - runtime->avail - count1)) 1092 count = runtime->buffer_size - runtime->avail - count1; 1093 memcpy(buffer + count1, runtime->buffer, count); 1094 result += count; 1095 } 1096 } 1097 __skip: 1098 spin_unlock_irqrestore(&runtime->lock, flags); 1099 return result; 1100 } 1101 1102 /** 1103 * snd_rawmidi_transmit_ack - acknowledge the transmission 1104 * @substream: the rawmidi substream 1105 * @count: the tranferred count 1106 * 1107 * Advances the hardware pointer for the internal output buffer with 1108 * the given size and updates the condition. 1109 * Call after the transmission is finished. 1110 * 1111 * Returns the advanced size if successful, or a negative error code on failure. 1112 */ 1113 int snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count) 1114 { 1115 unsigned long flags; 1116 struct snd_rawmidi_runtime *runtime = substream->runtime; 1117 1118 if (runtime->buffer == NULL) { 1119 snd_printd("snd_rawmidi_transmit_ack: output is not active!!!\n"); 1120 return -EINVAL; 1121 } 1122 spin_lock_irqsave(&runtime->lock, flags); 1123 snd_BUG_ON(runtime->avail + count > runtime->buffer_size); 1124 runtime->hw_ptr += count; 1125 runtime->hw_ptr %= runtime->buffer_size; 1126 runtime->avail += count; 1127 substream->bytes += count; 1128 if (count > 0) { 1129 if (runtime->drain || snd_rawmidi_ready(substream)) 1130 wake_up(&runtime->sleep); 1131 } 1132 spin_unlock_irqrestore(&runtime->lock, flags); 1133 return count; 1134 } 1135 1136 /** 1137 * snd_rawmidi_transmit - copy from the buffer to the device 1138 * @substream: the rawmidi substream 1139 * @buffer: the buffer pointer 1140 * @count: the data size to transfer 1141 * 1142 * Copies data from the buffer to the device and advances the pointer. 1143 * 1144 * Returns the copied size if successful, or a negative error code on failure. 1145 */ 1146 int snd_rawmidi_transmit(struct snd_rawmidi_substream *substream, 1147 unsigned char *buffer, int count) 1148 { 1149 if (!substream->opened) 1150 return -EBADFD; 1151 count = snd_rawmidi_transmit_peek(substream, buffer, count); 1152 if (count < 0) 1153 return count; 1154 return snd_rawmidi_transmit_ack(substream, count); 1155 } 1156 1157 static long snd_rawmidi_kernel_write1(struct snd_rawmidi_substream *substream, 1158 const unsigned char __user *userbuf, 1159 const unsigned char *kernelbuf, 1160 long count) 1161 { 1162 unsigned long flags; 1163 long count1, result; 1164 struct snd_rawmidi_runtime *runtime = substream->runtime; 1165 1166 if (snd_BUG_ON(!kernelbuf && !userbuf)) 1167 return -EINVAL; 1168 if (snd_BUG_ON(!runtime->buffer)) 1169 return -EINVAL; 1170 1171 result = 0; 1172 spin_lock_irqsave(&runtime->lock, flags); 1173 if (substream->append) { 1174 if ((long)runtime->avail < count) { 1175 spin_unlock_irqrestore(&runtime->lock, flags); 1176 return -EAGAIN; 1177 } 1178 } 1179 while (count > 0 && runtime->avail > 0) { 1180 count1 = runtime->buffer_size - runtime->appl_ptr; 1181 if (count1 > count) 1182 count1 = count; 1183 if (count1 > (long)runtime->avail) 1184 count1 = runtime->avail; 1185 if (kernelbuf) 1186 memcpy(runtime->buffer + runtime->appl_ptr, 1187 kernelbuf + result, count1); 1188 else if (userbuf) { 1189 spin_unlock_irqrestore(&runtime->lock, flags); 1190 if (copy_from_user(runtime->buffer + runtime->appl_ptr, 1191 userbuf + result, count1)) { 1192 spin_lock_irqsave(&runtime->lock, flags); 1193 result = result > 0 ? result : -EFAULT; 1194 goto __end; 1195 } 1196 spin_lock_irqsave(&runtime->lock, flags); 1197 } 1198 runtime->appl_ptr += count1; 1199 runtime->appl_ptr %= runtime->buffer_size; 1200 runtime->avail -= count1; 1201 result += count1; 1202 count -= count1; 1203 } 1204 __end: 1205 count1 = runtime->avail < runtime->buffer_size; 1206 spin_unlock_irqrestore(&runtime->lock, flags); 1207 if (count1) 1208 snd_rawmidi_output_trigger(substream, 1); 1209 return result; 1210 } 1211 1212 long snd_rawmidi_kernel_write(struct snd_rawmidi_substream *substream, 1213 const unsigned char *buf, long count) 1214 { 1215 return snd_rawmidi_kernel_write1(substream, NULL, buf, count); 1216 } 1217 1218 static ssize_t snd_rawmidi_write(struct file *file, const char __user *buf, 1219 size_t count, loff_t *offset) 1220 { 1221 long result, timeout; 1222 int count1; 1223 struct snd_rawmidi_file *rfile; 1224 struct snd_rawmidi_runtime *runtime; 1225 struct snd_rawmidi_substream *substream; 1226 1227 rfile = file->private_data; 1228 substream = rfile->output; 1229 runtime = substream->runtime; 1230 /* we cannot put an atomic message to our buffer */ 1231 if (substream->append && count > runtime->buffer_size) 1232 return -EIO; 1233 result = 0; 1234 while (count > 0) { 1235 spin_lock_irq(&runtime->lock); 1236 while (!snd_rawmidi_ready_append(substream, count)) { 1237 wait_queue_t wait; 1238 if (file->f_flags & O_NONBLOCK) { 1239 spin_unlock_irq(&runtime->lock); 1240 return result > 0 ? result : -EAGAIN; 1241 } 1242 init_waitqueue_entry(&wait, current); 1243 add_wait_queue(&runtime->sleep, &wait); 1244 set_current_state(TASK_INTERRUPTIBLE); 1245 spin_unlock_irq(&runtime->lock); 1246 timeout = schedule_timeout(30 * HZ); 1247 remove_wait_queue(&runtime->sleep, &wait); 1248 if (signal_pending(current)) 1249 return result > 0 ? result : -ERESTARTSYS; 1250 if (!runtime->avail && !timeout) 1251 return result > 0 ? result : -EIO; 1252 spin_lock_irq(&runtime->lock); 1253 } 1254 spin_unlock_irq(&runtime->lock); 1255 count1 = snd_rawmidi_kernel_write1(substream, buf, NULL, count); 1256 if (count1 < 0) 1257 return result > 0 ? result : count1; 1258 result += count1; 1259 buf += count1; 1260 if ((size_t)count1 < count && (file->f_flags & O_NONBLOCK)) 1261 break; 1262 count -= count1; 1263 } 1264 if (file->f_flags & O_DSYNC) { 1265 spin_lock_irq(&runtime->lock); 1266 while (runtime->avail != runtime->buffer_size) { 1267 wait_queue_t wait; 1268 unsigned int last_avail = runtime->avail; 1269 init_waitqueue_entry(&wait, current); 1270 add_wait_queue(&runtime->sleep, &wait); 1271 set_current_state(TASK_INTERRUPTIBLE); 1272 spin_unlock_irq(&runtime->lock); 1273 timeout = schedule_timeout(30 * HZ); 1274 remove_wait_queue(&runtime->sleep, &wait); 1275 if (signal_pending(current)) 1276 return result > 0 ? result : -ERESTARTSYS; 1277 if (runtime->avail == last_avail && !timeout) 1278 return result > 0 ? result : -EIO; 1279 spin_lock_irq(&runtime->lock); 1280 } 1281 spin_unlock_irq(&runtime->lock); 1282 } 1283 return result; 1284 } 1285 1286 static unsigned int snd_rawmidi_poll(struct file *file, poll_table * wait) 1287 { 1288 struct snd_rawmidi_file *rfile; 1289 struct snd_rawmidi_runtime *runtime; 1290 unsigned int mask; 1291 1292 rfile = file->private_data; 1293 if (rfile->input != NULL) { 1294 runtime = rfile->input->runtime; 1295 snd_rawmidi_input_trigger(rfile->input, 1); 1296 poll_wait(file, &runtime->sleep, wait); 1297 } 1298 if (rfile->output != NULL) { 1299 runtime = rfile->output->runtime; 1300 poll_wait(file, &runtime->sleep, wait); 1301 } 1302 mask = 0; 1303 if (rfile->input != NULL) { 1304 if (snd_rawmidi_ready(rfile->input)) 1305 mask |= POLLIN | POLLRDNORM; 1306 } 1307 if (rfile->output != NULL) { 1308 if (snd_rawmidi_ready(rfile->output)) 1309 mask |= POLLOUT | POLLWRNORM; 1310 } 1311 return mask; 1312 } 1313 1314 /* 1315 */ 1316 #ifdef CONFIG_COMPAT 1317 #include "rawmidi_compat.c" 1318 #else 1319 #define snd_rawmidi_ioctl_compat NULL 1320 #endif 1321 1322 /* 1323 1324 */ 1325 1326 static void snd_rawmidi_proc_info_read(struct snd_info_entry *entry, 1327 struct snd_info_buffer *buffer) 1328 { 1329 struct snd_rawmidi *rmidi; 1330 struct snd_rawmidi_substream *substream; 1331 struct snd_rawmidi_runtime *runtime; 1332 1333 rmidi = entry->private_data; 1334 snd_iprintf(buffer, "%s\n\n", rmidi->name); 1335 mutex_lock(&rmidi->open_mutex); 1336 if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_OUTPUT) { 1337 list_for_each_entry(substream, 1338 &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams, 1339 list) { 1340 snd_iprintf(buffer, 1341 "Output %d\n" 1342 " Tx bytes : %lu\n", 1343 substream->number, 1344 (unsigned long) substream->bytes); 1345 if (substream->opened) { 1346 snd_iprintf(buffer, 1347 " Owner PID : %d\n", 1348 pid_vnr(substream->pid)); 1349 runtime = substream->runtime; 1350 snd_iprintf(buffer, 1351 " Mode : %s\n" 1352 " Buffer size : %lu\n" 1353 " Avail : %lu\n", 1354 runtime->oss ? "OSS compatible" : "native", 1355 (unsigned long) runtime->buffer_size, 1356 (unsigned long) runtime->avail); 1357 } 1358 } 1359 } 1360 if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_INPUT) { 1361 list_for_each_entry(substream, 1362 &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams, 1363 list) { 1364 snd_iprintf(buffer, 1365 "Input %d\n" 1366 " Rx bytes : %lu\n", 1367 substream->number, 1368 (unsigned long) substream->bytes); 1369 if (substream->opened) { 1370 snd_iprintf(buffer, 1371 " Owner PID : %d\n", 1372 pid_vnr(substream->pid)); 1373 runtime = substream->runtime; 1374 snd_iprintf(buffer, 1375 " Buffer size : %lu\n" 1376 " Avail : %lu\n" 1377 " Overruns : %lu\n", 1378 (unsigned long) runtime->buffer_size, 1379 (unsigned long) runtime->avail, 1380 (unsigned long) runtime->xruns); 1381 } 1382 } 1383 } 1384 mutex_unlock(&rmidi->open_mutex); 1385 } 1386 1387 /* 1388 * Register functions 1389 */ 1390 1391 static const struct file_operations snd_rawmidi_f_ops = 1392 { 1393 .owner = THIS_MODULE, 1394 .read = snd_rawmidi_read, 1395 .write = snd_rawmidi_write, 1396 .open = snd_rawmidi_open, 1397 .release = snd_rawmidi_release, 1398 .llseek = no_llseek, 1399 .poll = snd_rawmidi_poll, 1400 .unlocked_ioctl = snd_rawmidi_ioctl, 1401 .compat_ioctl = snd_rawmidi_ioctl_compat, 1402 }; 1403 1404 static int snd_rawmidi_alloc_substreams(struct snd_rawmidi *rmidi, 1405 struct snd_rawmidi_str *stream, 1406 int direction, 1407 int count) 1408 { 1409 struct snd_rawmidi_substream *substream; 1410 int idx; 1411 1412 for (idx = 0; idx < count; idx++) { 1413 substream = kzalloc(sizeof(*substream), GFP_KERNEL); 1414 if (substream == NULL) { 1415 snd_printk(KERN_ERR "rawmidi: cannot allocate substream\n"); 1416 return -ENOMEM; 1417 } 1418 substream->stream = direction; 1419 substream->number = idx; 1420 substream->rmidi = rmidi; 1421 substream->pstr = stream; 1422 list_add_tail(&substream->list, &stream->substreams); 1423 stream->substream_count++; 1424 } 1425 return 0; 1426 } 1427 1428 /** 1429 * snd_rawmidi_new - create a rawmidi instance 1430 * @card: the card instance 1431 * @id: the id string 1432 * @device: the device index 1433 * @output_count: the number of output streams 1434 * @input_count: the number of input streams 1435 * @rrawmidi: the pointer to store the new rawmidi instance 1436 * 1437 * Creates a new rawmidi instance. 1438 * Use snd_rawmidi_set_ops() to set the operators to the new instance. 1439 * 1440 * Returns zero if successful, or a negative error code on failure. 1441 */ 1442 int snd_rawmidi_new(struct snd_card *card, char *id, int device, 1443 int output_count, int input_count, 1444 struct snd_rawmidi ** rrawmidi) 1445 { 1446 struct snd_rawmidi *rmidi; 1447 int err; 1448 static struct snd_device_ops ops = { 1449 .dev_free = snd_rawmidi_dev_free, 1450 .dev_register = snd_rawmidi_dev_register, 1451 .dev_disconnect = snd_rawmidi_dev_disconnect, 1452 }; 1453 1454 if (snd_BUG_ON(!card)) 1455 return -ENXIO; 1456 if (rrawmidi) 1457 *rrawmidi = NULL; 1458 rmidi = kzalloc(sizeof(*rmidi), GFP_KERNEL); 1459 if (rmidi == NULL) { 1460 snd_printk(KERN_ERR "rawmidi: cannot allocate\n"); 1461 return -ENOMEM; 1462 } 1463 rmidi->card = card; 1464 rmidi->device = device; 1465 mutex_init(&rmidi->open_mutex); 1466 init_waitqueue_head(&rmidi->open_wait); 1467 INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams); 1468 INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams); 1469 1470 if (id != NULL) 1471 strlcpy(rmidi->id, id, sizeof(rmidi->id)); 1472 if ((err = snd_rawmidi_alloc_substreams(rmidi, 1473 &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT], 1474 SNDRV_RAWMIDI_STREAM_INPUT, 1475 input_count)) < 0) { 1476 snd_rawmidi_free(rmidi); 1477 return err; 1478 } 1479 if ((err = snd_rawmidi_alloc_substreams(rmidi, 1480 &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT], 1481 SNDRV_RAWMIDI_STREAM_OUTPUT, 1482 output_count)) < 0) { 1483 snd_rawmidi_free(rmidi); 1484 return err; 1485 } 1486 if ((err = snd_device_new(card, SNDRV_DEV_RAWMIDI, rmidi, &ops)) < 0) { 1487 snd_rawmidi_free(rmidi); 1488 return err; 1489 } 1490 if (rrawmidi) 1491 *rrawmidi = rmidi; 1492 return 0; 1493 } 1494 1495 static void snd_rawmidi_free_substreams(struct snd_rawmidi_str *stream) 1496 { 1497 struct snd_rawmidi_substream *substream; 1498 1499 while (!list_empty(&stream->substreams)) { 1500 substream = list_entry(stream->substreams.next, struct snd_rawmidi_substream, list); 1501 list_del(&substream->list); 1502 kfree(substream); 1503 } 1504 } 1505 1506 static int snd_rawmidi_free(struct snd_rawmidi *rmidi) 1507 { 1508 if (!rmidi) 1509 return 0; 1510 1511 snd_info_free_entry(rmidi->proc_entry); 1512 rmidi->proc_entry = NULL; 1513 mutex_lock(®ister_mutex); 1514 if (rmidi->ops && rmidi->ops->dev_unregister) 1515 rmidi->ops->dev_unregister(rmidi); 1516 mutex_unlock(®ister_mutex); 1517 1518 snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT]); 1519 snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT]); 1520 if (rmidi->private_free) 1521 rmidi->private_free(rmidi); 1522 kfree(rmidi); 1523 return 0; 1524 } 1525 1526 static int snd_rawmidi_dev_free(struct snd_device *device) 1527 { 1528 struct snd_rawmidi *rmidi = device->device_data; 1529 return snd_rawmidi_free(rmidi); 1530 } 1531 1532 #if defined(CONFIG_SND_SEQUENCER) || (defined(MODULE) && defined(CONFIG_SND_SEQUENCER_MODULE)) 1533 static void snd_rawmidi_dev_seq_free(struct snd_seq_device *device) 1534 { 1535 struct snd_rawmidi *rmidi = device->private_data; 1536 rmidi->seq_dev = NULL; 1537 } 1538 #endif 1539 1540 static int snd_rawmidi_dev_register(struct snd_device *device) 1541 { 1542 int err; 1543 struct snd_info_entry *entry; 1544 char name[16]; 1545 struct snd_rawmidi *rmidi = device->device_data; 1546 1547 if (rmidi->device >= SNDRV_RAWMIDI_DEVICES) 1548 return -ENOMEM; 1549 mutex_lock(®ister_mutex); 1550 if (snd_rawmidi_search(rmidi->card, rmidi->device)) { 1551 mutex_unlock(®ister_mutex); 1552 return -EBUSY; 1553 } 1554 list_add_tail(&rmidi->list, &snd_rawmidi_devices); 1555 sprintf(name, "midiC%iD%i", rmidi->card->number, rmidi->device); 1556 if ((err = snd_register_device(SNDRV_DEVICE_TYPE_RAWMIDI, 1557 rmidi->card, rmidi->device, 1558 &snd_rawmidi_f_ops, rmidi, name)) < 0) { 1559 snd_printk(KERN_ERR "unable to register rawmidi device %i:%i\n", rmidi->card->number, rmidi->device); 1560 list_del(&rmidi->list); 1561 mutex_unlock(®ister_mutex); 1562 return err; 1563 } 1564 if (rmidi->ops && rmidi->ops->dev_register && 1565 (err = rmidi->ops->dev_register(rmidi)) < 0) { 1566 snd_unregister_device(SNDRV_DEVICE_TYPE_RAWMIDI, rmidi->card, rmidi->device); 1567 list_del(&rmidi->list); 1568 mutex_unlock(®ister_mutex); 1569 return err; 1570 } 1571 #ifdef CONFIG_SND_OSSEMUL 1572 rmidi->ossreg = 0; 1573 if ((int)rmidi->device == midi_map[rmidi->card->number]) { 1574 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, 1575 rmidi->card, 0, &snd_rawmidi_f_ops, 1576 rmidi, name) < 0) { 1577 snd_printk(KERN_ERR "unable to register OSS rawmidi device %i:%i\n", rmidi->card->number, 0); 1578 } else { 1579 rmidi->ossreg++; 1580 #ifdef SNDRV_OSS_INFO_DEV_MIDI 1581 snd_oss_info_register(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number, rmidi->name); 1582 #endif 1583 } 1584 } 1585 if ((int)rmidi->device == amidi_map[rmidi->card->number]) { 1586 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, 1587 rmidi->card, 1, &snd_rawmidi_f_ops, 1588 rmidi, name) < 0) { 1589 snd_printk(KERN_ERR "unable to register OSS rawmidi device %i:%i\n", rmidi->card->number, 1); 1590 } else { 1591 rmidi->ossreg++; 1592 } 1593 } 1594 #endif /* CONFIG_SND_OSSEMUL */ 1595 mutex_unlock(®ister_mutex); 1596 sprintf(name, "midi%d", rmidi->device); 1597 entry = snd_info_create_card_entry(rmidi->card, name, rmidi->card->proc_root); 1598 if (entry) { 1599 entry->private_data = rmidi; 1600 entry->c.text.read = snd_rawmidi_proc_info_read; 1601 if (snd_info_register(entry) < 0) { 1602 snd_info_free_entry(entry); 1603 entry = NULL; 1604 } 1605 } 1606 rmidi->proc_entry = entry; 1607 #if defined(CONFIG_SND_SEQUENCER) || (defined(MODULE) && defined(CONFIG_SND_SEQUENCER_MODULE)) 1608 if (!rmidi->ops || !rmidi->ops->dev_register) { /* own registration mechanism */ 1609 if (snd_seq_device_new(rmidi->card, rmidi->device, SNDRV_SEQ_DEV_ID_MIDISYNTH, 0, &rmidi->seq_dev) >= 0) { 1610 rmidi->seq_dev->private_data = rmidi; 1611 rmidi->seq_dev->private_free = snd_rawmidi_dev_seq_free; 1612 sprintf(rmidi->seq_dev->name, "MIDI %d-%d", rmidi->card->number, rmidi->device); 1613 snd_device_register(rmidi->card, rmidi->seq_dev); 1614 } 1615 } 1616 #endif 1617 return 0; 1618 } 1619 1620 static int snd_rawmidi_dev_disconnect(struct snd_device *device) 1621 { 1622 struct snd_rawmidi *rmidi = device->device_data; 1623 1624 mutex_lock(®ister_mutex); 1625 list_del_init(&rmidi->list); 1626 #ifdef CONFIG_SND_OSSEMUL 1627 if (rmidi->ossreg) { 1628 if ((int)rmidi->device == midi_map[rmidi->card->number]) { 1629 snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 0); 1630 #ifdef SNDRV_OSS_INFO_DEV_MIDI 1631 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number); 1632 #endif 1633 } 1634 if ((int)rmidi->device == amidi_map[rmidi->card->number]) 1635 snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 1); 1636 rmidi->ossreg = 0; 1637 } 1638 #endif /* CONFIG_SND_OSSEMUL */ 1639 snd_unregister_device(SNDRV_DEVICE_TYPE_RAWMIDI, rmidi->card, rmidi->device); 1640 mutex_unlock(®ister_mutex); 1641 return 0; 1642 } 1643 1644 /** 1645 * snd_rawmidi_set_ops - set the rawmidi operators 1646 * @rmidi: the rawmidi instance 1647 * @stream: the stream direction, SNDRV_RAWMIDI_STREAM_XXX 1648 * @ops: the operator table 1649 * 1650 * Sets the rawmidi operators for the given stream direction. 1651 */ 1652 void snd_rawmidi_set_ops(struct snd_rawmidi *rmidi, int stream, 1653 struct snd_rawmidi_ops *ops) 1654 { 1655 struct snd_rawmidi_substream *substream; 1656 1657 list_for_each_entry(substream, &rmidi->streams[stream].substreams, list) 1658 substream->ops = ops; 1659 } 1660 1661 /* 1662 * ENTRY functions 1663 */ 1664 1665 static int __init alsa_rawmidi_init(void) 1666 { 1667 1668 snd_ctl_register_ioctl(snd_rawmidi_control_ioctl); 1669 snd_ctl_register_ioctl_compat(snd_rawmidi_control_ioctl); 1670 #ifdef CONFIG_SND_OSSEMUL 1671 { int i; 1672 /* check device map table */ 1673 for (i = 0; i < SNDRV_CARDS; i++) { 1674 if (midi_map[i] < 0 || midi_map[i] >= SNDRV_RAWMIDI_DEVICES) { 1675 snd_printk(KERN_ERR "invalid midi_map[%d] = %d\n", i, midi_map[i]); 1676 midi_map[i] = 0; 1677 } 1678 if (amidi_map[i] < 0 || amidi_map[i] >= SNDRV_RAWMIDI_DEVICES) { 1679 snd_printk(KERN_ERR "invalid amidi_map[%d] = %d\n", i, amidi_map[i]); 1680 amidi_map[i] = 1; 1681 } 1682 } 1683 } 1684 #endif /* CONFIG_SND_OSSEMUL */ 1685 return 0; 1686 } 1687 1688 static void __exit alsa_rawmidi_exit(void) 1689 { 1690 snd_ctl_unregister_ioctl(snd_rawmidi_control_ioctl); 1691 snd_ctl_unregister_ioctl_compat(snd_rawmidi_control_ioctl); 1692 } 1693 1694 module_init(alsa_rawmidi_init) 1695 module_exit(alsa_rawmidi_exit) 1696 1697 EXPORT_SYMBOL(snd_rawmidi_output_params); 1698 EXPORT_SYMBOL(snd_rawmidi_input_params); 1699 EXPORT_SYMBOL(snd_rawmidi_drop_output); 1700 EXPORT_SYMBOL(snd_rawmidi_drain_output); 1701 EXPORT_SYMBOL(snd_rawmidi_drain_input); 1702 EXPORT_SYMBOL(snd_rawmidi_receive); 1703 EXPORT_SYMBOL(snd_rawmidi_transmit_empty); 1704 EXPORT_SYMBOL(snd_rawmidi_transmit_peek); 1705 EXPORT_SYMBOL(snd_rawmidi_transmit_ack); 1706 EXPORT_SYMBOL(snd_rawmidi_transmit); 1707 EXPORT_SYMBOL(snd_rawmidi_new); 1708 EXPORT_SYMBOL(snd_rawmidi_set_ops); 1709 EXPORT_SYMBOL(snd_rawmidi_info_select); 1710 EXPORT_SYMBOL(snd_rawmidi_kernel_open); 1711 EXPORT_SYMBOL(snd_rawmidi_kernel_release); 1712 EXPORT_SYMBOL(snd_rawmidi_kernel_read); 1713 EXPORT_SYMBOL(snd_rawmidi_kernel_write); 1714