1 /* 2 * Abstract layer for MIDI v1.0 stream 3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz> 4 * 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, write to the Free Software 18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 19 * 20 */ 21 22 #include <sound/core.h> 23 #include <linux/major.h> 24 #include <linux/init.h> 25 #include <linux/sched.h> 26 #include <linux/slab.h> 27 #include <linux/time.h> 28 #include <linux/wait.h> 29 #include <linux/mutex.h> 30 #include <linux/module.h> 31 #include <linux/delay.h> 32 #include <sound/rawmidi.h> 33 #include <sound/info.h> 34 #include <sound/control.h> 35 #include <sound/minors.h> 36 #include <sound/initval.h> 37 38 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>"); 39 MODULE_DESCRIPTION("Midlevel RawMidi code for ALSA."); 40 MODULE_LICENSE("GPL"); 41 42 #ifdef CONFIG_SND_OSSEMUL 43 static int midi_map[SNDRV_CARDS]; 44 static int amidi_map[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS-1)] = 1}; 45 module_param_array(midi_map, int, NULL, 0444); 46 MODULE_PARM_DESC(midi_map, "Raw MIDI device number assigned to 1st OSS device."); 47 module_param_array(amidi_map, int, NULL, 0444); 48 MODULE_PARM_DESC(amidi_map, "Raw MIDI device number assigned to 2nd OSS device."); 49 #endif /* CONFIG_SND_OSSEMUL */ 50 51 static int snd_rawmidi_free(struct snd_rawmidi *rawmidi); 52 static int snd_rawmidi_dev_free(struct snd_device *device); 53 static int snd_rawmidi_dev_register(struct snd_device *device); 54 static int snd_rawmidi_dev_disconnect(struct snd_device *device); 55 56 static LIST_HEAD(snd_rawmidi_devices); 57 static DEFINE_MUTEX(register_mutex); 58 59 #define rmidi_err(rmidi, fmt, args...) \ 60 dev_err(&(rmidi)->dev, fmt, ##args) 61 #define rmidi_warn(rmidi, fmt, args...) \ 62 dev_warn(&(rmidi)->dev, fmt, ##args) 63 #define rmidi_dbg(rmidi, fmt, args...) \ 64 dev_dbg(&(rmidi)->dev, fmt, ##args) 65 66 static struct snd_rawmidi *snd_rawmidi_search(struct snd_card *card, int device) 67 { 68 struct snd_rawmidi *rawmidi; 69 70 list_for_each_entry(rawmidi, &snd_rawmidi_devices, list) 71 if (rawmidi->card == card && rawmidi->device == device) 72 return rawmidi; 73 return NULL; 74 } 75 76 static inline unsigned short snd_rawmidi_file_flags(struct file *file) 77 { 78 switch (file->f_mode & (FMODE_READ | FMODE_WRITE)) { 79 case FMODE_WRITE: 80 return SNDRV_RAWMIDI_LFLG_OUTPUT; 81 case FMODE_READ: 82 return SNDRV_RAWMIDI_LFLG_INPUT; 83 default: 84 return SNDRV_RAWMIDI_LFLG_OPEN; 85 } 86 } 87 88 static inline int snd_rawmidi_ready(struct snd_rawmidi_substream *substream) 89 { 90 struct snd_rawmidi_runtime *runtime = substream->runtime; 91 return runtime->avail >= runtime->avail_min; 92 } 93 94 static inline int snd_rawmidi_ready_append(struct snd_rawmidi_substream *substream, 95 size_t count) 96 { 97 struct snd_rawmidi_runtime *runtime = substream->runtime; 98 return runtime->avail >= runtime->avail_min && 99 (!substream->append || runtime->avail >= count); 100 } 101 102 static void snd_rawmidi_input_event_work(struct work_struct *work) 103 { 104 struct snd_rawmidi_runtime *runtime = 105 container_of(work, struct snd_rawmidi_runtime, event_work); 106 if (runtime->event) 107 runtime->event(runtime->substream); 108 } 109 110 static int snd_rawmidi_runtime_create(struct snd_rawmidi_substream *substream) 111 { 112 struct snd_rawmidi_runtime *runtime; 113 114 if ((runtime = kzalloc(sizeof(*runtime), GFP_KERNEL)) == NULL) 115 return -ENOMEM; 116 runtime->substream = substream; 117 spin_lock_init(&runtime->lock); 118 init_waitqueue_head(&runtime->sleep); 119 INIT_WORK(&runtime->event_work, snd_rawmidi_input_event_work); 120 runtime->event = NULL; 121 runtime->buffer_size = PAGE_SIZE; 122 runtime->avail_min = 1; 123 if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT) 124 runtime->avail = 0; 125 else 126 runtime->avail = runtime->buffer_size; 127 if ((runtime->buffer = kmalloc(runtime->buffer_size, GFP_KERNEL)) == NULL) { 128 kfree(runtime); 129 return -ENOMEM; 130 } 131 runtime->appl_ptr = runtime->hw_ptr = 0; 132 substream->runtime = runtime; 133 return 0; 134 } 135 136 static int snd_rawmidi_runtime_free(struct snd_rawmidi_substream *substream) 137 { 138 struct snd_rawmidi_runtime *runtime = substream->runtime; 139 140 kfree(runtime->buffer); 141 kfree(runtime); 142 substream->runtime = NULL; 143 return 0; 144 } 145 146 static inline void snd_rawmidi_output_trigger(struct snd_rawmidi_substream *substream,int up) 147 { 148 if (!substream->opened) 149 return; 150 substream->ops->trigger(substream, up); 151 } 152 153 static void snd_rawmidi_input_trigger(struct snd_rawmidi_substream *substream, int up) 154 { 155 if (!substream->opened) 156 return; 157 substream->ops->trigger(substream, up); 158 if (!up) 159 cancel_work_sync(&substream->runtime->event_work); 160 } 161 162 int snd_rawmidi_drop_output(struct snd_rawmidi_substream *substream) 163 { 164 unsigned long flags; 165 struct snd_rawmidi_runtime *runtime = substream->runtime; 166 167 snd_rawmidi_output_trigger(substream, 0); 168 runtime->drain = 0; 169 spin_lock_irqsave(&runtime->lock, flags); 170 runtime->appl_ptr = runtime->hw_ptr = 0; 171 runtime->avail = runtime->buffer_size; 172 spin_unlock_irqrestore(&runtime->lock, flags); 173 return 0; 174 } 175 EXPORT_SYMBOL(snd_rawmidi_drop_output); 176 177 int snd_rawmidi_drain_output(struct snd_rawmidi_substream *substream) 178 { 179 int err; 180 long timeout; 181 struct snd_rawmidi_runtime *runtime = substream->runtime; 182 183 err = 0; 184 runtime->drain = 1; 185 timeout = wait_event_interruptible_timeout(runtime->sleep, 186 (runtime->avail >= runtime->buffer_size), 187 10*HZ); 188 if (signal_pending(current)) 189 err = -ERESTARTSYS; 190 if (runtime->avail < runtime->buffer_size && !timeout) { 191 rmidi_warn(substream->rmidi, 192 "rawmidi drain error (avail = %li, buffer_size = %li)\n", 193 (long)runtime->avail, (long)runtime->buffer_size); 194 err = -EIO; 195 } 196 runtime->drain = 0; 197 if (err != -ERESTARTSYS) { 198 /* we need wait a while to make sure that Tx FIFOs are empty */ 199 if (substream->ops->drain) 200 substream->ops->drain(substream); 201 else 202 msleep(50); 203 snd_rawmidi_drop_output(substream); 204 } 205 return err; 206 } 207 EXPORT_SYMBOL(snd_rawmidi_drain_output); 208 209 int snd_rawmidi_drain_input(struct snd_rawmidi_substream *substream) 210 { 211 unsigned long flags; 212 struct snd_rawmidi_runtime *runtime = substream->runtime; 213 214 snd_rawmidi_input_trigger(substream, 0); 215 runtime->drain = 0; 216 spin_lock_irqsave(&runtime->lock, flags); 217 runtime->appl_ptr = runtime->hw_ptr = 0; 218 runtime->avail = 0; 219 spin_unlock_irqrestore(&runtime->lock, flags); 220 return 0; 221 } 222 EXPORT_SYMBOL(snd_rawmidi_drain_input); 223 224 /* look for an available substream for the given stream direction; 225 * if a specific subdevice is given, try to assign it 226 */ 227 static int assign_substream(struct snd_rawmidi *rmidi, int subdevice, 228 int stream, int mode, 229 struct snd_rawmidi_substream **sub_ret) 230 { 231 struct snd_rawmidi_substream *substream; 232 struct snd_rawmidi_str *s = &rmidi->streams[stream]; 233 static unsigned int info_flags[2] = { 234 [SNDRV_RAWMIDI_STREAM_OUTPUT] = SNDRV_RAWMIDI_INFO_OUTPUT, 235 [SNDRV_RAWMIDI_STREAM_INPUT] = SNDRV_RAWMIDI_INFO_INPUT, 236 }; 237 238 if (!(rmidi->info_flags & info_flags[stream])) 239 return -ENXIO; 240 if (subdevice >= 0 && subdevice >= s->substream_count) 241 return -ENODEV; 242 243 list_for_each_entry(substream, &s->substreams, list) { 244 if (substream->opened) { 245 if (stream == SNDRV_RAWMIDI_STREAM_INPUT || 246 !(mode & SNDRV_RAWMIDI_LFLG_APPEND) || 247 !substream->append) 248 continue; 249 } 250 if (subdevice < 0 || subdevice == substream->number) { 251 *sub_ret = substream; 252 return 0; 253 } 254 } 255 return -EAGAIN; 256 } 257 258 /* open and do ref-counting for the given substream */ 259 static int open_substream(struct snd_rawmidi *rmidi, 260 struct snd_rawmidi_substream *substream, 261 int mode) 262 { 263 int err; 264 265 if (substream->use_count == 0) { 266 err = snd_rawmidi_runtime_create(substream); 267 if (err < 0) 268 return err; 269 err = substream->ops->open(substream); 270 if (err < 0) { 271 snd_rawmidi_runtime_free(substream); 272 return err; 273 } 274 substream->opened = 1; 275 substream->active_sensing = 0; 276 if (mode & SNDRV_RAWMIDI_LFLG_APPEND) 277 substream->append = 1; 278 substream->pid = get_pid(task_pid(current)); 279 rmidi->streams[substream->stream].substream_opened++; 280 } 281 substream->use_count++; 282 return 0; 283 } 284 285 static void close_substream(struct snd_rawmidi *rmidi, 286 struct snd_rawmidi_substream *substream, 287 int cleanup); 288 289 static int rawmidi_open_priv(struct snd_rawmidi *rmidi, int subdevice, int mode, 290 struct snd_rawmidi_file *rfile) 291 { 292 struct snd_rawmidi_substream *sinput = NULL, *soutput = NULL; 293 int err; 294 295 rfile->input = rfile->output = NULL; 296 if (mode & SNDRV_RAWMIDI_LFLG_INPUT) { 297 err = assign_substream(rmidi, subdevice, 298 SNDRV_RAWMIDI_STREAM_INPUT, 299 mode, &sinput); 300 if (err < 0) 301 return err; 302 } 303 if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) { 304 err = assign_substream(rmidi, subdevice, 305 SNDRV_RAWMIDI_STREAM_OUTPUT, 306 mode, &soutput); 307 if (err < 0) 308 return err; 309 } 310 311 if (sinput) { 312 err = open_substream(rmidi, sinput, mode); 313 if (err < 0) 314 return err; 315 } 316 if (soutput) { 317 err = open_substream(rmidi, soutput, mode); 318 if (err < 0) { 319 if (sinput) 320 close_substream(rmidi, sinput, 0); 321 return err; 322 } 323 } 324 325 rfile->rmidi = rmidi; 326 rfile->input = sinput; 327 rfile->output = soutput; 328 return 0; 329 } 330 331 /* called from sound/core/seq/seq_midi.c */ 332 int snd_rawmidi_kernel_open(struct snd_card *card, int device, int subdevice, 333 int mode, struct snd_rawmidi_file * rfile) 334 { 335 struct snd_rawmidi *rmidi; 336 int err; 337 338 if (snd_BUG_ON(!rfile)) 339 return -EINVAL; 340 341 mutex_lock(®ister_mutex); 342 rmidi = snd_rawmidi_search(card, device); 343 if (rmidi == NULL) { 344 mutex_unlock(®ister_mutex); 345 return -ENODEV; 346 } 347 if (!try_module_get(rmidi->card->module)) { 348 mutex_unlock(®ister_mutex); 349 return -ENXIO; 350 } 351 mutex_unlock(®ister_mutex); 352 353 mutex_lock(&rmidi->open_mutex); 354 err = rawmidi_open_priv(rmidi, subdevice, mode, rfile); 355 mutex_unlock(&rmidi->open_mutex); 356 if (err < 0) 357 module_put(rmidi->card->module); 358 return err; 359 } 360 EXPORT_SYMBOL(snd_rawmidi_kernel_open); 361 362 static int snd_rawmidi_open(struct inode *inode, struct file *file) 363 { 364 int maj = imajor(inode); 365 struct snd_card *card; 366 int subdevice; 367 unsigned short fflags; 368 int err; 369 struct snd_rawmidi *rmidi; 370 struct snd_rawmidi_file *rawmidi_file = NULL; 371 wait_queue_t wait; 372 373 if ((file->f_flags & O_APPEND) && !(file->f_flags & O_NONBLOCK)) 374 return -EINVAL; /* invalid combination */ 375 376 err = nonseekable_open(inode, file); 377 if (err < 0) 378 return err; 379 380 if (maj == snd_major) { 381 rmidi = snd_lookup_minor_data(iminor(inode), 382 SNDRV_DEVICE_TYPE_RAWMIDI); 383 #ifdef CONFIG_SND_OSSEMUL 384 } else if (maj == SOUND_MAJOR) { 385 rmidi = snd_lookup_oss_minor_data(iminor(inode), 386 SNDRV_OSS_DEVICE_TYPE_MIDI); 387 #endif 388 } else 389 return -ENXIO; 390 391 if (rmidi == NULL) 392 return -ENODEV; 393 394 if (!try_module_get(rmidi->card->module)) { 395 snd_card_unref(rmidi->card); 396 return -ENXIO; 397 } 398 399 mutex_lock(&rmidi->open_mutex); 400 card = rmidi->card; 401 err = snd_card_file_add(card, file); 402 if (err < 0) 403 goto __error_card; 404 fflags = snd_rawmidi_file_flags(file); 405 if ((file->f_flags & O_APPEND) || maj == SOUND_MAJOR) /* OSS emul? */ 406 fflags |= SNDRV_RAWMIDI_LFLG_APPEND; 407 rawmidi_file = kmalloc(sizeof(*rawmidi_file), GFP_KERNEL); 408 if (rawmidi_file == NULL) { 409 err = -ENOMEM; 410 goto __error; 411 } 412 init_waitqueue_entry(&wait, current); 413 add_wait_queue(&rmidi->open_wait, &wait); 414 while (1) { 415 subdevice = snd_ctl_get_preferred_subdevice(card, SND_CTL_SUBDEV_RAWMIDI); 416 err = rawmidi_open_priv(rmidi, subdevice, fflags, rawmidi_file); 417 if (err >= 0) 418 break; 419 if (err == -EAGAIN) { 420 if (file->f_flags & O_NONBLOCK) { 421 err = -EBUSY; 422 break; 423 } 424 } else 425 break; 426 set_current_state(TASK_INTERRUPTIBLE); 427 mutex_unlock(&rmidi->open_mutex); 428 schedule(); 429 mutex_lock(&rmidi->open_mutex); 430 if (rmidi->card->shutdown) { 431 err = -ENODEV; 432 break; 433 } 434 if (signal_pending(current)) { 435 err = -ERESTARTSYS; 436 break; 437 } 438 } 439 remove_wait_queue(&rmidi->open_wait, &wait); 440 if (err < 0) { 441 kfree(rawmidi_file); 442 goto __error; 443 } 444 #ifdef CONFIG_SND_OSSEMUL 445 if (rawmidi_file->input && rawmidi_file->input->runtime) 446 rawmidi_file->input->runtime->oss = (maj == SOUND_MAJOR); 447 if (rawmidi_file->output && rawmidi_file->output->runtime) 448 rawmidi_file->output->runtime->oss = (maj == SOUND_MAJOR); 449 #endif 450 file->private_data = rawmidi_file; 451 mutex_unlock(&rmidi->open_mutex); 452 snd_card_unref(rmidi->card); 453 return 0; 454 455 __error: 456 snd_card_file_remove(card, file); 457 __error_card: 458 mutex_unlock(&rmidi->open_mutex); 459 module_put(rmidi->card->module); 460 snd_card_unref(rmidi->card); 461 return err; 462 } 463 464 static void close_substream(struct snd_rawmidi *rmidi, 465 struct snd_rawmidi_substream *substream, 466 int cleanup) 467 { 468 if (--substream->use_count) 469 return; 470 471 if (cleanup) { 472 if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT) 473 snd_rawmidi_input_trigger(substream, 0); 474 else { 475 if (substream->active_sensing) { 476 unsigned char buf = 0xfe; 477 /* sending single active sensing message 478 * to shut the device up 479 */ 480 snd_rawmidi_kernel_write(substream, &buf, 1); 481 } 482 if (snd_rawmidi_drain_output(substream) == -ERESTARTSYS) 483 snd_rawmidi_output_trigger(substream, 0); 484 } 485 } 486 substream->ops->close(substream); 487 if (substream->runtime->private_free) 488 substream->runtime->private_free(substream); 489 snd_rawmidi_runtime_free(substream); 490 substream->opened = 0; 491 substream->append = 0; 492 put_pid(substream->pid); 493 substream->pid = NULL; 494 rmidi->streams[substream->stream].substream_opened--; 495 } 496 497 static void rawmidi_release_priv(struct snd_rawmidi_file *rfile) 498 { 499 struct snd_rawmidi *rmidi; 500 501 rmidi = rfile->rmidi; 502 mutex_lock(&rmidi->open_mutex); 503 if (rfile->input) { 504 close_substream(rmidi, rfile->input, 1); 505 rfile->input = NULL; 506 } 507 if (rfile->output) { 508 close_substream(rmidi, rfile->output, 1); 509 rfile->output = NULL; 510 } 511 rfile->rmidi = NULL; 512 mutex_unlock(&rmidi->open_mutex); 513 wake_up(&rmidi->open_wait); 514 } 515 516 /* called from sound/core/seq/seq_midi.c */ 517 int snd_rawmidi_kernel_release(struct snd_rawmidi_file *rfile) 518 { 519 struct snd_rawmidi *rmidi; 520 521 if (snd_BUG_ON(!rfile)) 522 return -ENXIO; 523 524 rmidi = rfile->rmidi; 525 rawmidi_release_priv(rfile); 526 module_put(rmidi->card->module); 527 return 0; 528 } 529 EXPORT_SYMBOL(snd_rawmidi_kernel_release); 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 struct module *module; 536 537 rfile = file->private_data; 538 rmidi = rfile->rmidi; 539 rawmidi_release_priv(rfile); 540 kfree(rfile); 541 module = rmidi->card->module; 542 snd_card_file_remove(rmidi->card, file); 543 module_put(module); 544 return 0; 545 } 546 547 static int snd_rawmidi_info(struct snd_rawmidi_substream *substream, 548 struct snd_rawmidi_info *info) 549 { 550 struct snd_rawmidi *rmidi; 551 552 if (substream == NULL) 553 return -ENODEV; 554 rmidi = substream->rmidi; 555 memset(info, 0, sizeof(*info)); 556 info->card = rmidi->card->number; 557 info->device = rmidi->device; 558 info->subdevice = substream->number; 559 info->stream = substream->stream; 560 info->flags = rmidi->info_flags; 561 strcpy(info->id, rmidi->id); 562 strcpy(info->name, rmidi->name); 563 strcpy(info->subname, substream->name); 564 info->subdevices_count = substream->pstr->substream_count; 565 info->subdevices_avail = (substream->pstr->substream_count - 566 substream->pstr->substream_opened); 567 return 0; 568 } 569 570 static int snd_rawmidi_info_user(struct snd_rawmidi_substream *substream, 571 struct snd_rawmidi_info __user * _info) 572 { 573 struct snd_rawmidi_info info; 574 int err; 575 if ((err = snd_rawmidi_info(substream, &info)) < 0) 576 return err; 577 if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info))) 578 return -EFAULT; 579 return 0; 580 } 581 582 int snd_rawmidi_info_select(struct snd_card *card, struct snd_rawmidi_info *info) 583 { 584 struct snd_rawmidi *rmidi; 585 struct snd_rawmidi_str *pstr; 586 struct snd_rawmidi_substream *substream; 587 588 mutex_lock(®ister_mutex); 589 rmidi = snd_rawmidi_search(card, info->device); 590 mutex_unlock(®ister_mutex); 591 if (!rmidi) 592 return -ENXIO; 593 if (info->stream < 0 || info->stream > 1) 594 return -EINVAL; 595 pstr = &rmidi->streams[info->stream]; 596 if (pstr->substream_count == 0) 597 return -ENOENT; 598 if (info->subdevice >= pstr->substream_count) 599 return -ENXIO; 600 list_for_each_entry(substream, &pstr->substreams, list) { 601 if ((unsigned int)substream->number == info->subdevice) 602 return snd_rawmidi_info(substream, info); 603 } 604 return -ENXIO; 605 } 606 EXPORT_SYMBOL(snd_rawmidi_info_select); 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 = krealloc(runtime->buffer, params->buffer_size, 643 GFP_KERNEL); 644 if (!newbuf) 645 return -ENOMEM; 646 runtime->buffer = newbuf; 647 runtime->buffer_size = params->buffer_size; 648 runtime->avail = runtime->buffer_size; 649 } 650 runtime->avail_min = params->avail_min; 651 substream->active_sensing = !params->no_active_sensing; 652 return 0; 653 } 654 EXPORT_SYMBOL(snd_rawmidi_output_params); 655 656 int snd_rawmidi_input_params(struct snd_rawmidi_substream *substream, 657 struct snd_rawmidi_params * params) 658 { 659 char *newbuf; 660 struct snd_rawmidi_runtime *runtime = substream->runtime; 661 662 snd_rawmidi_drain_input(substream); 663 if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L) { 664 return -EINVAL; 665 } 666 if (params->avail_min < 1 || params->avail_min > params->buffer_size) { 667 return -EINVAL; 668 } 669 if (params->buffer_size != runtime->buffer_size) { 670 newbuf = krealloc(runtime->buffer, params->buffer_size, 671 GFP_KERNEL); 672 if (!newbuf) 673 return -ENOMEM; 674 runtime->buffer = newbuf; 675 runtime->buffer_size = params->buffer_size; 676 } 677 runtime->avail_min = params->avail_min; 678 return 0; 679 } 680 EXPORT_SYMBOL(snd_rawmidi_input_params); 681 682 static int snd_rawmidi_output_status(struct snd_rawmidi_substream *substream, 683 struct snd_rawmidi_status * status) 684 { 685 struct snd_rawmidi_runtime *runtime = substream->runtime; 686 687 memset(status, 0, sizeof(*status)); 688 status->stream = SNDRV_RAWMIDI_STREAM_OUTPUT; 689 spin_lock_irq(&runtime->lock); 690 status->avail = runtime->avail; 691 spin_unlock_irq(&runtime->lock); 692 return 0; 693 } 694 695 static int snd_rawmidi_input_status(struct snd_rawmidi_substream *substream, 696 struct snd_rawmidi_status * status) 697 { 698 struct snd_rawmidi_runtime *runtime = substream->runtime; 699 700 memset(status, 0, sizeof(*status)); 701 status->stream = SNDRV_RAWMIDI_STREAM_INPUT; 702 spin_lock_irq(&runtime->lock); 703 status->avail = runtime->avail; 704 status->xruns = runtime->xruns; 705 runtime->xruns = 0; 706 spin_unlock_irq(&runtime->lock); 707 return 0; 708 } 709 710 static long snd_rawmidi_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 711 { 712 struct snd_rawmidi_file *rfile; 713 void __user *argp = (void __user *)arg; 714 715 rfile = file->private_data; 716 if (((cmd >> 8) & 0xff) != 'W') 717 return -ENOTTY; 718 switch (cmd) { 719 case SNDRV_RAWMIDI_IOCTL_PVERSION: 720 return put_user(SNDRV_RAWMIDI_VERSION, (int __user *)argp) ? -EFAULT : 0; 721 case SNDRV_RAWMIDI_IOCTL_INFO: 722 { 723 int stream; 724 struct snd_rawmidi_info __user *info = argp; 725 if (get_user(stream, &info->stream)) 726 return -EFAULT; 727 switch (stream) { 728 case SNDRV_RAWMIDI_STREAM_INPUT: 729 return snd_rawmidi_info_user(rfile->input, info); 730 case SNDRV_RAWMIDI_STREAM_OUTPUT: 731 return snd_rawmidi_info_user(rfile->output, info); 732 default: 733 return -EINVAL; 734 } 735 } 736 case SNDRV_RAWMIDI_IOCTL_PARAMS: 737 { 738 struct snd_rawmidi_params params; 739 if (copy_from_user(¶ms, argp, sizeof(struct snd_rawmidi_params))) 740 return -EFAULT; 741 switch (params.stream) { 742 case SNDRV_RAWMIDI_STREAM_OUTPUT: 743 if (rfile->output == NULL) 744 return -EINVAL; 745 return snd_rawmidi_output_params(rfile->output, ¶ms); 746 case SNDRV_RAWMIDI_STREAM_INPUT: 747 if (rfile->input == NULL) 748 return -EINVAL; 749 return snd_rawmidi_input_params(rfile->input, ¶ms); 750 default: 751 return -EINVAL; 752 } 753 } 754 case SNDRV_RAWMIDI_IOCTL_STATUS: 755 { 756 int err = 0; 757 struct snd_rawmidi_status status; 758 if (copy_from_user(&status, argp, sizeof(struct snd_rawmidi_status))) 759 return -EFAULT; 760 switch (status.stream) { 761 case SNDRV_RAWMIDI_STREAM_OUTPUT: 762 if (rfile->output == NULL) 763 return -EINVAL; 764 err = snd_rawmidi_output_status(rfile->output, &status); 765 break; 766 case SNDRV_RAWMIDI_STREAM_INPUT: 767 if (rfile->input == NULL) 768 return -EINVAL; 769 err = snd_rawmidi_input_status(rfile->input, &status); 770 break; 771 default: 772 return -EINVAL; 773 } 774 if (err < 0) 775 return err; 776 if (copy_to_user(argp, &status, sizeof(struct snd_rawmidi_status))) 777 return -EFAULT; 778 return 0; 779 } 780 case SNDRV_RAWMIDI_IOCTL_DROP: 781 { 782 int val; 783 if (get_user(val, (int __user *) argp)) 784 return -EFAULT; 785 switch (val) { 786 case SNDRV_RAWMIDI_STREAM_OUTPUT: 787 if (rfile->output == NULL) 788 return -EINVAL; 789 return snd_rawmidi_drop_output(rfile->output); 790 default: 791 return -EINVAL; 792 } 793 } 794 case SNDRV_RAWMIDI_IOCTL_DRAIN: 795 { 796 int val; 797 if (get_user(val, (int __user *) argp)) 798 return -EFAULT; 799 switch (val) { 800 case SNDRV_RAWMIDI_STREAM_OUTPUT: 801 if (rfile->output == NULL) 802 return -EINVAL; 803 return snd_rawmidi_drain_output(rfile->output); 804 case SNDRV_RAWMIDI_STREAM_INPUT: 805 if (rfile->input == NULL) 806 return -EINVAL; 807 return snd_rawmidi_drain_input(rfile->input); 808 default: 809 return -EINVAL; 810 } 811 } 812 default: 813 rmidi_dbg(rfile->rmidi, 814 "rawmidi: unknown command = 0x%x\n", cmd); 815 } 816 return -ENOTTY; 817 } 818 819 static int snd_rawmidi_control_ioctl(struct snd_card *card, 820 struct snd_ctl_file *control, 821 unsigned int cmd, 822 unsigned long arg) 823 { 824 void __user *argp = (void __user *)arg; 825 826 switch (cmd) { 827 case SNDRV_CTL_IOCTL_RAWMIDI_NEXT_DEVICE: 828 { 829 int device; 830 831 if (get_user(device, (int __user *)argp)) 832 return -EFAULT; 833 if (device >= SNDRV_RAWMIDI_DEVICES) /* next device is -1 */ 834 device = SNDRV_RAWMIDI_DEVICES - 1; 835 mutex_lock(®ister_mutex); 836 device = device < 0 ? 0 : device + 1; 837 while (device < SNDRV_RAWMIDI_DEVICES) { 838 if (snd_rawmidi_search(card, device)) 839 break; 840 device++; 841 } 842 if (device == SNDRV_RAWMIDI_DEVICES) 843 device = -1; 844 mutex_unlock(®ister_mutex); 845 if (put_user(device, (int __user *)argp)) 846 return -EFAULT; 847 return 0; 848 } 849 case SNDRV_CTL_IOCTL_RAWMIDI_PREFER_SUBDEVICE: 850 { 851 int val; 852 853 if (get_user(val, (int __user *)argp)) 854 return -EFAULT; 855 control->preferred_subdevice[SND_CTL_SUBDEV_RAWMIDI] = val; 856 return 0; 857 } 858 case SNDRV_CTL_IOCTL_RAWMIDI_INFO: 859 return snd_rawmidi_info_select_user(card, argp); 860 } 861 return -ENOIOCTLCMD; 862 } 863 864 /** 865 * snd_rawmidi_receive - receive the input data from the device 866 * @substream: the rawmidi substream 867 * @buffer: the buffer pointer 868 * @count: the data size to read 869 * 870 * Reads the data from the internal buffer. 871 * 872 * Return: The size of read data, or a negative error code on failure. 873 */ 874 int snd_rawmidi_receive(struct snd_rawmidi_substream *substream, 875 const unsigned char *buffer, int count) 876 { 877 unsigned long flags; 878 int result = 0, count1; 879 struct snd_rawmidi_runtime *runtime = substream->runtime; 880 881 if (!substream->opened) 882 return -EBADFD; 883 if (runtime->buffer == NULL) { 884 rmidi_dbg(substream->rmidi, 885 "snd_rawmidi_receive: input is not active!!!\n"); 886 return -EINVAL; 887 } 888 spin_lock_irqsave(&runtime->lock, flags); 889 if (count == 1) { /* special case, faster code */ 890 substream->bytes++; 891 if (runtime->avail < runtime->buffer_size) { 892 runtime->buffer[runtime->hw_ptr++] = buffer[0]; 893 runtime->hw_ptr %= runtime->buffer_size; 894 runtime->avail++; 895 result++; 896 } else { 897 runtime->xruns++; 898 } 899 } else { 900 substream->bytes += count; 901 count1 = runtime->buffer_size - runtime->hw_ptr; 902 if (count1 > count) 903 count1 = count; 904 if (count1 > (int)(runtime->buffer_size - runtime->avail)) 905 count1 = runtime->buffer_size - runtime->avail; 906 memcpy(runtime->buffer + runtime->hw_ptr, buffer, count1); 907 runtime->hw_ptr += count1; 908 runtime->hw_ptr %= runtime->buffer_size; 909 runtime->avail += count1; 910 count -= count1; 911 result += count1; 912 if (count > 0) { 913 buffer += count1; 914 count1 = count; 915 if (count1 > (int)(runtime->buffer_size - runtime->avail)) { 916 count1 = runtime->buffer_size - runtime->avail; 917 runtime->xruns += count - count1; 918 } 919 if (count1 > 0) { 920 memcpy(runtime->buffer, buffer, count1); 921 runtime->hw_ptr = count1; 922 runtime->avail += count1; 923 result += count1; 924 } 925 } 926 } 927 if (result > 0) { 928 if (runtime->event) 929 schedule_work(&runtime->event_work); 930 else if (snd_rawmidi_ready(substream)) 931 wake_up(&runtime->sleep); 932 } 933 spin_unlock_irqrestore(&runtime->lock, flags); 934 return result; 935 } 936 EXPORT_SYMBOL(snd_rawmidi_receive); 937 938 static long snd_rawmidi_kernel_read1(struct snd_rawmidi_substream *substream, 939 unsigned char __user *userbuf, 940 unsigned char *kernelbuf, long count) 941 { 942 unsigned long flags; 943 long result = 0, count1; 944 struct snd_rawmidi_runtime *runtime = substream->runtime; 945 946 while (count > 0 && runtime->avail) { 947 count1 = runtime->buffer_size - runtime->appl_ptr; 948 if (count1 > count) 949 count1 = count; 950 spin_lock_irqsave(&runtime->lock, flags); 951 if (count1 > (int)runtime->avail) 952 count1 = runtime->avail; 953 if (kernelbuf) 954 memcpy(kernelbuf + result, runtime->buffer + runtime->appl_ptr, count1); 955 if (userbuf) { 956 spin_unlock_irqrestore(&runtime->lock, flags); 957 if (copy_to_user(userbuf + result, 958 runtime->buffer + runtime->appl_ptr, count1)) { 959 return result > 0 ? result : -EFAULT; 960 } 961 spin_lock_irqsave(&runtime->lock, flags); 962 } 963 runtime->appl_ptr += count1; 964 runtime->appl_ptr %= runtime->buffer_size; 965 runtime->avail -= count1; 966 spin_unlock_irqrestore(&runtime->lock, flags); 967 result += count1; 968 count -= count1; 969 } 970 return result; 971 } 972 973 long snd_rawmidi_kernel_read(struct snd_rawmidi_substream *substream, 974 unsigned char *buf, long count) 975 { 976 snd_rawmidi_input_trigger(substream, 1); 977 return snd_rawmidi_kernel_read1(substream, NULL/*userbuf*/, buf, count); 978 } 979 EXPORT_SYMBOL(snd_rawmidi_kernel_read); 980 981 static ssize_t snd_rawmidi_read(struct file *file, char __user *buf, size_t count, 982 loff_t *offset) 983 { 984 long result; 985 int count1; 986 struct snd_rawmidi_file *rfile; 987 struct snd_rawmidi_substream *substream; 988 struct snd_rawmidi_runtime *runtime; 989 990 rfile = file->private_data; 991 substream = rfile->input; 992 if (substream == NULL) 993 return -EIO; 994 runtime = substream->runtime; 995 snd_rawmidi_input_trigger(substream, 1); 996 result = 0; 997 while (count > 0) { 998 spin_lock_irq(&runtime->lock); 999 while (!snd_rawmidi_ready(substream)) { 1000 wait_queue_t wait; 1001 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) { 1002 spin_unlock_irq(&runtime->lock); 1003 return result > 0 ? result : -EAGAIN; 1004 } 1005 init_waitqueue_entry(&wait, current); 1006 add_wait_queue(&runtime->sleep, &wait); 1007 set_current_state(TASK_INTERRUPTIBLE); 1008 spin_unlock_irq(&runtime->lock); 1009 schedule(); 1010 remove_wait_queue(&runtime->sleep, &wait); 1011 if (rfile->rmidi->card->shutdown) 1012 return -ENODEV; 1013 if (signal_pending(current)) 1014 return result > 0 ? result : -ERESTARTSYS; 1015 if (!runtime->avail) 1016 return result > 0 ? result : -EIO; 1017 spin_lock_irq(&runtime->lock); 1018 } 1019 spin_unlock_irq(&runtime->lock); 1020 count1 = snd_rawmidi_kernel_read1(substream, 1021 (unsigned char __user *)buf, 1022 NULL/*kernelbuf*/, 1023 count); 1024 if (count1 < 0) 1025 return result > 0 ? result : count1; 1026 result += count1; 1027 buf += count1; 1028 count -= count1; 1029 } 1030 return result; 1031 } 1032 1033 /** 1034 * snd_rawmidi_transmit_empty - check whether the output buffer is empty 1035 * @substream: the rawmidi substream 1036 * 1037 * Return: 1 if the internal output buffer is empty, 0 if not. 1038 */ 1039 int snd_rawmidi_transmit_empty(struct snd_rawmidi_substream *substream) 1040 { 1041 struct snd_rawmidi_runtime *runtime = substream->runtime; 1042 int result; 1043 unsigned long flags; 1044 1045 if (runtime->buffer == NULL) { 1046 rmidi_dbg(substream->rmidi, 1047 "snd_rawmidi_transmit_empty: output is not active!!!\n"); 1048 return 1; 1049 } 1050 spin_lock_irqsave(&runtime->lock, flags); 1051 result = runtime->avail >= runtime->buffer_size; 1052 spin_unlock_irqrestore(&runtime->lock, flags); 1053 return result; 1054 } 1055 EXPORT_SYMBOL(snd_rawmidi_transmit_empty); 1056 1057 /** 1058 * snd_rawmidi_transmit_peek - copy data from the internal buffer 1059 * @substream: the rawmidi substream 1060 * @buffer: the buffer pointer 1061 * @count: data size to transfer 1062 * 1063 * Copies data from the internal output buffer to the given buffer. 1064 * 1065 * Call this in the interrupt handler when the midi output is ready, 1066 * and call snd_rawmidi_transmit_ack() after the transmission is 1067 * finished. 1068 * 1069 * Return: The size of copied data, or a negative error code on failure. 1070 */ 1071 int snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream, 1072 unsigned char *buffer, int count) 1073 { 1074 unsigned long flags; 1075 int result, count1; 1076 struct snd_rawmidi_runtime *runtime = substream->runtime; 1077 1078 if (runtime->buffer == NULL) { 1079 rmidi_dbg(substream->rmidi, 1080 "snd_rawmidi_transmit_peek: output is not active!!!\n"); 1081 return -EINVAL; 1082 } 1083 result = 0; 1084 spin_lock_irqsave(&runtime->lock, flags); 1085 if (runtime->avail >= runtime->buffer_size) { 1086 /* warning: lowlevel layer MUST trigger down the hardware */ 1087 goto __skip; 1088 } 1089 if (count == 1) { /* special case, faster code */ 1090 *buffer = runtime->buffer[runtime->hw_ptr]; 1091 result++; 1092 } else { 1093 count1 = runtime->buffer_size - runtime->hw_ptr; 1094 if (count1 > count) 1095 count1 = count; 1096 if (count1 > (int)(runtime->buffer_size - runtime->avail)) 1097 count1 = runtime->buffer_size - runtime->avail; 1098 memcpy(buffer, runtime->buffer + runtime->hw_ptr, count1); 1099 count -= count1; 1100 result += count1; 1101 if (count > 0) { 1102 if (count > (int)(runtime->buffer_size - runtime->avail - count1)) 1103 count = runtime->buffer_size - runtime->avail - count1; 1104 memcpy(buffer + count1, runtime->buffer, count); 1105 result += count; 1106 } 1107 } 1108 __skip: 1109 spin_unlock_irqrestore(&runtime->lock, flags); 1110 return result; 1111 } 1112 EXPORT_SYMBOL(snd_rawmidi_transmit_peek); 1113 1114 /** 1115 * snd_rawmidi_transmit_ack - acknowledge the transmission 1116 * @substream: the rawmidi substream 1117 * @count: the transferred count 1118 * 1119 * Advances the hardware pointer for the internal output buffer with 1120 * the given size and updates the condition. 1121 * Call after the transmission is finished. 1122 * 1123 * Return: The advanced size if successful, or a negative error code on failure. 1124 */ 1125 int snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count) 1126 { 1127 unsigned long flags; 1128 struct snd_rawmidi_runtime *runtime = substream->runtime; 1129 1130 if (runtime->buffer == NULL) { 1131 rmidi_dbg(substream->rmidi, 1132 "snd_rawmidi_transmit_ack: output is not active!!!\n"); 1133 return -EINVAL; 1134 } 1135 spin_lock_irqsave(&runtime->lock, flags); 1136 snd_BUG_ON(runtime->avail + count > runtime->buffer_size); 1137 runtime->hw_ptr += count; 1138 runtime->hw_ptr %= runtime->buffer_size; 1139 runtime->avail += count; 1140 substream->bytes += count; 1141 if (count > 0) { 1142 if (runtime->drain || snd_rawmidi_ready(substream)) 1143 wake_up(&runtime->sleep); 1144 } 1145 spin_unlock_irqrestore(&runtime->lock, flags); 1146 return count; 1147 } 1148 EXPORT_SYMBOL(snd_rawmidi_transmit_ack); 1149 1150 /** 1151 * snd_rawmidi_transmit - copy from the buffer to the device 1152 * @substream: the rawmidi substream 1153 * @buffer: the buffer pointer 1154 * @count: the data size to transfer 1155 * 1156 * Copies data from the buffer to the device and advances the pointer. 1157 * 1158 * Return: The copied size if successful, or a negative error code on failure. 1159 */ 1160 int snd_rawmidi_transmit(struct snd_rawmidi_substream *substream, 1161 unsigned char *buffer, int count) 1162 { 1163 if (!substream->opened) 1164 return -EBADFD; 1165 count = snd_rawmidi_transmit_peek(substream, buffer, count); 1166 if (count < 0) 1167 return count; 1168 return snd_rawmidi_transmit_ack(substream, count); 1169 } 1170 EXPORT_SYMBOL(snd_rawmidi_transmit); 1171 1172 static long snd_rawmidi_kernel_write1(struct snd_rawmidi_substream *substream, 1173 const unsigned char __user *userbuf, 1174 const unsigned char *kernelbuf, 1175 long count) 1176 { 1177 unsigned long flags; 1178 long count1, result; 1179 struct snd_rawmidi_runtime *runtime = substream->runtime; 1180 1181 if (snd_BUG_ON(!kernelbuf && !userbuf)) 1182 return -EINVAL; 1183 if (snd_BUG_ON(!runtime->buffer)) 1184 return -EINVAL; 1185 1186 result = 0; 1187 spin_lock_irqsave(&runtime->lock, flags); 1188 if (substream->append) { 1189 if ((long)runtime->avail < count) { 1190 spin_unlock_irqrestore(&runtime->lock, flags); 1191 return -EAGAIN; 1192 } 1193 } 1194 while (count > 0 && runtime->avail > 0) { 1195 count1 = runtime->buffer_size - runtime->appl_ptr; 1196 if (count1 > count) 1197 count1 = count; 1198 if (count1 > (long)runtime->avail) 1199 count1 = runtime->avail; 1200 if (kernelbuf) 1201 memcpy(runtime->buffer + runtime->appl_ptr, 1202 kernelbuf + result, count1); 1203 else if (userbuf) { 1204 spin_unlock_irqrestore(&runtime->lock, flags); 1205 if (copy_from_user(runtime->buffer + runtime->appl_ptr, 1206 userbuf + result, count1)) { 1207 spin_lock_irqsave(&runtime->lock, flags); 1208 result = result > 0 ? result : -EFAULT; 1209 goto __end; 1210 } 1211 spin_lock_irqsave(&runtime->lock, flags); 1212 } 1213 runtime->appl_ptr += count1; 1214 runtime->appl_ptr %= runtime->buffer_size; 1215 runtime->avail -= count1; 1216 result += count1; 1217 count -= count1; 1218 } 1219 __end: 1220 count1 = runtime->avail < runtime->buffer_size; 1221 spin_unlock_irqrestore(&runtime->lock, flags); 1222 if (count1) 1223 snd_rawmidi_output_trigger(substream, 1); 1224 return result; 1225 } 1226 1227 long snd_rawmidi_kernel_write(struct snd_rawmidi_substream *substream, 1228 const unsigned char *buf, long count) 1229 { 1230 return snd_rawmidi_kernel_write1(substream, NULL, buf, count); 1231 } 1232 EXPORT_SYMBOL(snd_rawmidi_kernel_write); 1233 1234 static ssize_t snd_rawmidi_write(struct file *file, const char __user *buf, 1235 size_t count, loff_t *offset) 1236 { 1237 long result, timeout; 1238 int count1; 1239 struct snd_rawmidi_file *rfile; 1240 struct snd_rawmidi_runtime *runtime; 1241 struct snd_rawmidi_substream *substream; 1242 1243 rfile = file->private_data; 1244 substream = rfile->output; 1245 runtime = substream->runtime; 1246 /* we cannot put an atomic message to our buffer */ 1247 if (substream->append && count > runtime->buffer_size) 1248 return -EIO; 1249 result = 0; 1250 while (count > 0) { 1251 spin_lock_irq(&runtime->lock); 1252 while (!snd_rawmidi_ready_append(substream, count)) { 1253 wait_queue_t wait; 1254 if (file->f_flags & O_NONBLOCK) { 1255 spin_unlock_irq(&runtime->lock); 1256 return result > 0 ? result : -EAGAIN; 1257 } 1258 init_waitqueue_entry(&wait, current); 1259 add_wait_queue(&runtime->sleep, &wait); 1260 set_current_state(TASK_INTERRUPTIBLE); 1261 spin_unlock_irq(&runtime->lock); 1262 timeout = schedule_timeout(30 * HZ); 1263 remove_wait_queue(&runtime->sleep, &wait); 1264 if (rfile->rmidi->card->shutdown) 1265 return -ENODEV; 1266 if (signal_pending(current)) 1267 return result > 0 ? result : -ERESTARTSYS; 1268 if (!runtime->avail && !timeout) 1269 return result > 0 ? result : -EIO; 1270 spin_lock_irq(&runtime->lock); 1271 } 1272 spin_unlock_irq(&runtime->lock); 1273 count1 = snd_rawmidi_kernel_write1(substream, buf, NULL, count); 1274 if (count1 < 0) 1275 return result > 0 ? result : count1; 1276 result += count1; 1277 buf += count1; 1278 if ((size_t)count1 < count && (file->f_flags & O_NONBLOCK)) 1279 break; 1280 count -= count1; 1281 } 1282 if (file->f_flags & O_DSYNC) { 1283 spin_lock_irq(&runtime->lock); 1284 while (runtime->avail != runtime->buffer_size) { 1285 wait_queue_t wait; 1286 unsigned int last_avail = runtime->avail; 1287 init_waitqueue_entry(&wait, current); 1288 add_wait_queue(&runtime->sleep, &wait); 1289 set_current_state(TASK_INTERRUPTIBLE); 1290 spin_unlock_irq(&runtime->lock); 1291 timeout = schedule_timeout(30 * HZ); 1292 remove_wait_queue(&runtime->sleep, &wait); 1293 if (signal_pending(current)) 1294 return result > 0 ? result : -ERESTARTSYS; 1295 if (runtime->avail == last_avail && !timeout) 1296 return result > 0 ? result : -EIO; 1297 spin_lock_irq(&runtime->lock); 1298 } 1299 spin_unlock_irq(&runtime->lock); 1300 } 1301 return result; 1302 } 1303 1304 static unsigned int snd_rawmidi_poll(struct file *file, poll_table * wait) 1305 { 1306 struct snd_rawmidi_file *rfile; 1307 struct snd_rawmidi_runtime *runtime; 1308 unsigned int mask; 1309 1310 rfile = file->private_data; 1311 if (rfile->input != NULL) { 1312 runtime = rfile->input->runtime; 1313 snd_rawmidi_input_trigger(rfile->input, 1); 1314 poll_wait(file, &runtime->sleep, wait); 1315 } 1316 if (rfile->output != NULL) { 1317 runtime = rfile->output->runtime; 1318 poll_wait(file, &runtime->sleep, wait); 1319 } 1320 mask = 0; 1321 if (rfile->input != NULL) { 1322 if (snd_rawmidi_ready(rfile->input)) 1323 mask |= POLLIN | POLLRDNORM; 1324 } 1325 if (rfile->output != NULL) { 1326 if (snd_rawmidi_ready(rfile->output)) 1327 mask |= POLLOUT | POLLWRNORM; 1328 } 1329 return mask; 1330 } 1331 1332 /* 1333 */ 1334 #ifdef CONFIG_COMPAT 1335 #include "rawmidi_compat.c" 1336 #else 1337 #define snd_rawmidi_ioctl_compat NULL 1338 #endif 1339 1340 /* 1341 1342 */ 1343 1344 static void snd_rawmidi_proc_info_read(struct snd_info_entry *entry, 1345 struct snd_info_buffer *buffer) 1346 { 1347 struct snd_rawmidi *rmidi; 1348 struct snd_rawmidi_substream *substream; 1349 struct snd_rawmidi_runtime *runtime; 1350 1351 rmidi = entry->private_data; 1352 snd_iprintf(buffer, "%s\n\n", rmidi->name); 1353 mutex_lock(&rmidi->open_mutex); 1354 if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_OUTPUT) { 1355 list_for_each_entry(substream, 1356 &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams, 1357 list) { 1358 snd_iprintf(buffer, 1359 "Output %d\n" 1360 " Tx bytes : %lu\n", 1361 substream->number, 1362 (unsigned long) substream->bytes); 1363 if (substream->opened) { 1364 snd_iprintf(buffer, 1365 " Owner PID : %d\n", 1366 pid_vnr(substream->pid)); 1367 runtime = substream->runtime; 1368 snd_iprintf(buffer, 1369 " Mode : %s\n" 1370 " Buffer size : %lu\n" 1371 " Avail : %lu\n", 1372 runtime->oss ? "OSS compatible" : "native", 1373 (unsigned long) runtime->buffer_size, 1374 (unsigned long) runtime->avail); 1375 } 1376 } 1377 } 1378 if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_INPUT) { 1379 list_for_each_entry(substream, 1380 &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams, 1381 list) { 1382 snd_iprintf(buffer, 1383 "Input %d\n" 1384 " Rx bytes : %lu\n", 1385 substream->number, 1386 (unsigned long) substream->bytes); 1387 if (substream->opened) { 1388 snd_iprintf(buffer, 1389 " Owner PID : %d\n", 1390 pid_vnr(substream->pid)); 1391 runtime = substream->runtime; 1392 snd_iprintf(buffer, 1393 " Buffer size : %lu\n" 1394 " Avail : %lu\n" 1395 " Overruns : %lu\n", 1396 (unsigned long) runtime->buffer_size, 1397 (unsigned long) runtime->avail, 1398 (unsigned long) runtime->xruns); 1399 } 1400 } 1401 } 1402 mutex_unlock(&rmidi->open_mutex); 1403 } 1404 1405 /* 1406 * Register functions 1407 */ 1408 1409 static const struct file_operations snd_rawmidi_f_ops = 1410 { 1411 .owner = THIS_MODULE, 1412 .read = snd_rawmidi_read, 1413 .write = snd_rawmidi_write, 1414 .open = snd_rawmidi_open, 1415 .release = snd_rawmidi_release, 1416 .llseek = no_llseek, 1417 .poll = snd_rawmidi_poll, 1418 .unlocked_ioctl = snd_rawmidi_ioctl, 1419 .compat_ioctl = snd_rawmidi_ioctl_compat, 1420 }; 1421 1422 static int snd_rawmidi_alloc_substreams(struct snd_rawmidi *rmidi, 1423 struct snd_rawmidi_str *stream, 1424 int direction, 1425 int count) 1426 { 1427 struct snd_rawmidi_substream *substream; 1428 int idx; 1429 1430 for (idx = 0; idx < count; idx++) { 1431 substream = kzalloc(sizeof(*substream), GFP_KERNEL); 1432 if (!substream) 1433 return -ENOMEM; 1434 substream->stream = direction; 1435 substream->number = idx; 1436 substream->rmidi = rmidi; 1437 substream->pstr = stream; 1438 list_add_tail(&substream->list, &stream->substreams); 1439 stream->substream_count++; 1440 } 1441 return 0; 1442 } 1443 1444 static void release_rawmidi_device(struct device *dev) 1445 { 1446 kfree(container_of(dev, struct snd_rawmidi, dev)); 1447 } 1448 1449 /** 1450 * snd_rawmidi_new - create a rawmidi instance 1451 * @card: the card instance 1452 * @id: the id string 1453 * @device: the device index 1454 * @output_count: the number of output streams 1455 * @input_count: the number of input streams 1456 * @rrawmidi: the pointer to store the new rawmidi instance 1457 * 1458 * Creates a new rawmidi instance. 1459 * Use snd_rawmidi_set_ops() to set the operators to the new instance. 1460 * 1461 * Return: Zero if successful, or a negative error code on failure. 1462 */ 1463 int snd_rawmidi_new(struct snd_card *card, char *id, int device, 1464 int output_count, int input_count, 1465 struct snd_rawmidi ** rrawmidi) 1466 { 1467 struct snd_rawmidi *rmidi; 1468 int err; 1469 static struct snd_device_ops ops = { 1470 .dev_free = snd_rawmidi_dev_free, 1471 .dev_register = snd_rawmidi_dev_register, 1472 .dev_disconnect = snd_rawmidi_dev_disconnect, 1473 }; 1474 1475 if (snd_BUG_ON(!card)) 1476 return -ENXIO; 1477 if (rrawmidi) 1478 *rrawmidi = NULL; 1479 rmidi = kzalloc(sizeof(*rmidi), GFP_KERNEL); 1480 if (!rmidi) 1481 return -ENOMEM; 1482 rmidi->card = card; 1483 rmidi->device = device; 1484 mutex_init(&rmidi->open_mutex); 1485 init_waitqueue_head(&rmidi->open_wait); 1486 INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams); 1487 INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams); 1488 1489 if (id != NULL) 1490 strlcpy(rmidi->id, id, sizeof(rmidi->id)); 1491 1492 snd_device_initialize(&rmidi->dev, card); 1493 rmidi->dev.release = release_rawmidi_device; 1494 dev_set_name(&rmidi->dev, "midiC%iD%i", card->number, device); 1495 1496 if ((err = snd_rawmidi_alloc_substreams(rmidi, 1497 &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT], 1498 SNDRV_RAWMIDI_STREAM_INPUT, 1499 input_count)) < 0) { 1500 snd_rawmidi_free(rmidi); 1501 return err; 1502 } 1503 if ((err = snd_rawmidi_alloc_substreams(rmidi, 1504 &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT], 1505 SNDRV_RAWMIDI_STREAM_OUTPUT, 1506 output_count)) < 0) { 1507 snd_rawmidi_free(rmidi); 1508 return err; 1509 } 1510 if ((err = snd_device_new(card, SNDRV_DEV_RAWMIDI, rmidi, &ops)) < 0) { 1511 snd_rawmidi_free(rmidi); 1512 return err; 1513 } 1514 if (rrawmidi) 1515 *rrawmidi = rmidi; 1516 return 0; 1517 } 1518 EXPORT_SYMBOL(snd_rawmidi_new); 1519 1520 static void snd_rawmidi_free_substreams(struct snd_rawmidi_str *stream) 1521 { 1522 struct snd_rawmidi_substream *substream; 1523 1524 while (!list_empty(&stream->substreams)) { 1525 substream = list_entry(stream->substreams.next, struct snd_rawmidi_substream, list); 1526 list_del(&substream->list); 1527 kfree(substream); 1528 } 1529 } 1530 1531 static int snd_rawmidi_free(struct snd_rawmidi *rmidi) 1532 { 1533 if (!rmidi) 1534 return 0; 1535 1536 snd_info_free_entry(rmidi->proc_entry); 1537 rmidi->proc_entry = NULL; 1538 mutex_lock(®ister_mutex); 1539 if (rmidi->ops && rmidi->ops->dev_unregister) 1540 rmidi->ops->dev_unregister(rmidi); 1541 mutex_unlock(®ister_mutex); 1542 1543 snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT]); 1544 snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT]); 1545 if (rmidi->private_free) 1546 rmidi->private_free(rmidi); 1547 put_device(&rmidi->dev); 1548 return 0; 1549 } 1550 1551 static int snd_rawmidi_dev_free(struct snd_device *device) 1552 { 1553 struct snd_rawmidi *rmidi = device->device_data; 1554 return snd_rawmidi_free(rmidi); 1555 } 1556 1557 #if defined(CONFIG_SND_SEQUENCER) || (defined(MODULE) && defined(CONFIG_SND_SEQUENCER_MODULE)) 1558 static void snd_rawmidi_dev_seq_free(struct snd_seq_device *device) 1559 { 1560 struct snd_rawmidi *rmidi = device->private_data; 1561 rmidi->seq_dev = NULL; 1562 } 1563 #endif 1564 1565 static int snd_rawmidi_dev_register(struct snd_device *device) 1566 { 1567 int err; 1568 struct snd_info_entry *entry; 1569 char name[16]; 1570 struct snd_rawmidi *rmidi = device->device_data; 1571 1572 if (rmidi->device >= SNDRV_RAWMIDI_DEVICES) 1573 return -ENOMEM; 1574 mutex_lock(®ister_mutex); 1575 if (snd_rawmidi_search(rmidi->card, rmidi->device)) { 1576 mutex_unlock(®ister_mutex); 1577 return -EBUSY; 1578 } 1579 list_add_tail(&rmidi->list, &snd_rawmidi_devices); 1580 err = snd_register_device(SNDRV_DEVICE_TYPE_RAWMIDI, 1581 rmidi->card, rmidi->device, 1582 &snd_rawmidi_f_ops, rmidi, &rmidi->dev); 1583 if (err < 0) { 1584 rmidi_err(rmidi, "unable to register\n"); 1585 list_del(&rmidi->list); 1586 mutex_unlock(®ister_mutex); 1587 return err; 1588 } 1589 if (rmidi->ops && rmidi->ops->dev_register && 1590 (err = rmidi->ops->dev_register(rmidi)) < 0) { 1591 snd_unregister_device(&rmidi->dev); 1592 list_del(&rmidi->list); 1593 mutex_unlock(®ister_mutex); 1594 return err; 1595 } 1596 #ifdef CONFIG_SND_OSSEMUL 1597 rmidi->ossreg = 0; 1598 if ((int)rmidi->device == midi_map[rmidi->card->number]) { 1599 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, 1600 rmidi->card, 0, &snd_rawmidi_f_ops, 1601 rmidi) < 0) { 1602 rmidi_err(rmidi, 1603 "unable to register OSS rawmidi device %i:%i\n", 1604 rmidi->card->number, 0); 1605 } else { 1606 rmidi->ossreg++; 1607 #ifdef SNDRV_OSS_INFO_DEV_MIDI 1608 snd_oss_info_register(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number, rmidi->name); 1609 #endif 1610 } 1611 } 1612 if ((int)rmidi->device == amidi_map[rmidi->card->number]) { 1613 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, 1614 rmidi->card, 1, &snd_rawmidi_f_ops, 1615 rmidi) < 0) { 1616 rmidi_err(rmidi, 1617 "unable to register OSS rawmidi device %i:%i\n", 1618 rmidi->card->number, 1); 1619 } else { 1620 rmidi->ossreg++; 1621 } 1622 } 1623 #endif /* CONFIG_SND_OSSEMUL */ 1624 mutex_unlock(®ister_mutex); 1625 sprintf(name, "midi%d", rmidi->device); 1626 entry = snd_info_create_card_entry(rmidi->card, name, rmidi->card->proc_root); 1627 if (entry) { 1628 entry->private_data = rmidi; 1629 entry->c.text.read = snd_rawmidi_proc_info_read; 1630 if (snd_info_register(entry) < 0) { 1631 snd_info_free_entry(entry); 1632 entry = NULL; 1633 } 1634 } 1635 rmidi->proc_entry = entry; 1636 #if defined(CONFIG_SND_SEQUENCER) || (defined(MODULE) && defined(CONFIG_SND_SEQUENCER_MODULE)) 1637 if (!rmidi->ops || !rmidi->ops->dev_register) { /* own registration mechanism */ 1638 if (snd_seq_device_new(rmidi->card, rmidi->device, SNDRV_SEQ_DEV_ID_MIDISYNTH, 0, &rmidi->seq_dev) >= 0) { 1639 rmidi->seq_dev->private_data = rmidi; 1640 rmidi->seq_dev->private_free = snd_rawmidi_dev_seq_free; 1641 sprintf(rmidi->seq_dev->name, "MIDI %d-%d", rmidi->card->number, rmidi->device); 1642 snd_device_register(rmidi->card, rmidi->seq_dev); 1643 } 1644 } 1645 #endif 1646 return 0; 1647 } 1648 1649 static int snd_rawmidi_dev_disconnect(struct snd_device *device) 1650 { 1651 struct snd_rawmidi *rmidi = device->device_data; 1652 int dir; 1653 1654 mutex_lock(®ister_mutex); 1655 mutex_lock(&rmidi->open_mutex); 1656 wake_up(&rmidi->open_wait); 1657 list_del_init(&rmidi->list); 1658 for (dir = 0; dir < 2; dir++) { 1659 struct snd_rawmidi_substream *s; 1660 list_for_each_entry(s, &rmidi->streams[dir].substreams, list) { 1661 if (s->runtime) 1662 wake_up(&s->runtime->sleep); 1663 } 1664 } 1665 1666 #ifdef CONFIG_SND_OSSEMUL 1667 if (rmidi->ossreg) { 1668 if ((int)rmidi->device == midi_map[rmidi->card->number]) { 1669 snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 0); 1670 #ifdef SNDRV_OSS_INFO_DEV_MIDI 1671 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number); 1672 #endif 1673 } 1674 if ((int)rmidi->device == amidi_map[rmidi->card->number]) 1675 snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 1); 1676 rmidi->ossreg = 0; 1677 } 1678 #endif /* CONFIG_SND_OSSEMUL */ 1679 snd_unregister_device(&rmidi->dev); 1680 mutex_unlock(&rmidi->open_mutex); 1681 mutex_unlock(®ister_mutex); 1682 return 0; 1683 } 1684 1685 /** 1686 * snd_rawmidi_set_ops - set the rawmidi operators 1687 * @rmidi: the rawmidi instance 1688 * @stream: the stream direction, SNDRV_RAWMIDI_STREAM_XXX 1689 * @ops: the operator table 1690 * 1691 * Sets the rawmidi operators for the given stream direction. 1692 */ 1693 void snd_rawmidi_set_ops(struct snd_rawmidi *rmidi, int stream, 1694 struct snd_rawmidi_ops *ops) 1695 { 1696 struct snd_rawmidi_substream *substream; 1697 1698 list_for_each_entry(substream, &rmidi->streams[stream].substreams, list) 1699 substream->ops = ops; 1700 } 1701 EXPORT_SYMBOL(snd_rawmidi_set_ops); 1702 1703 /* 1704 * ENTRY functions 1705 */ 1706 1707 static int __init alsa_rawmidi_init(void) 1708 { 1709 1710 snd_ctl_register_ioctl(snd_rawmidi_control_ioctl); 1711 snd_ctl_register_ioctl_compat(snd_rawmidi_control_ioctl); 1712 #ifdef CONFIG_SND_OSSEMUL 1713 { int i; 1714 /* check device map table */ 1715 for (i = 0; i < SNDRV_CARDS; i++) { 1716 if (midi_map[i] < 0 || midi_map[i] >= SNDRV_RAWMIDI_DEVICES) { 1717 pr_err("ALSA: rawmidi: invalid midi_map[%d] = %d\n", 1718 i, midi_map[i]); 1719 midi_map[i] = 0; 1720 } 1721 if (amidi_map[i] < 0 || amidi_map[i] >= SNDRV_RAWMIDI_DEVICES) { 1722 pr_err("ALSA: rawmidi: invalid amidi_map[%d] = %d\n", 1723 i, amidi_map[i]); 1724 amidi_map[i] = 1; 1725 } 1726 } 1727 } 1728 #endif /* CONFIG_SND_OSSEMUL */ 1729 return 0; 1730 } 1731 1732 static void __exit alsa_rawmidi_exit(void) 1733 { 1734 snd_ctl_unregister_ioctl(snd_rawmidi_control_ioctl); 1735 snd_ctl_unregister_ioctl_compat(snd_rawmidi_control_ioctl); 1736 } 1737 1738 module_init(alsa_rawmidi_init) 1739 module_exit(alsa_rawmidi_exit) 1740