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