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 int snd_rawmidi_kernel_open(struct snd_card *card, int device, int subdevice, 228 int mode, struct snd_rawmidi_file * rfile) 229 { 230 struct snd_rawmidi *rmidi; 231 struct list_head *list1, *list2; 232 struct snd_rawmidi_substream *sinput = NULL, *soutput = NULL; 233 struct snd_rawmidi_runtime *input = NULL, *output = NULL; 234 int err; 235 236 if (rfile) 237 rfile->input = rfile->output = NULL; 238 mutex_lock(®ister_mutex); 239 rmidi = snd_rawmidi_search(card, device); 240 mutex_unlock(®ister_mutex); 241 if (rmidi == NULL) { 242 err = -ENODEV; 243 goto __error1; 244 } 245 if (!try_module_get(rmidi->card->module)) { 246 err = -EFAULT; 247 goto __error1; 248 } 249 if (!(mode & SNDRV_RAWMIDI_LFLG_NOOPENLOCK)) 250 mutex_lock(&rmidi->open_mutex); 251 if (mode & SNDRV_RAWMIDI_LFLG_INPUT) { 252 if (!(rmidi->info_flags & SNDRV_RAWMIDI_INFO_INPUT)) { 253 err = -ENXIO; 254 goto __error; 255 } 256 if (subdevice >= 0 && (unsigned int)subdevice >= rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substream_count) { 257 err = -ENODEV; 258 goto __error; 259 } 260 if (rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substream_opened >= 261 rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substream_count) { 262 err = -EAGAIN; 263 goto __error; 264 } 265 } 266 if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) { 267 if (!(rmidi->info_flags & SNDRV_RAWMIDI_INFO_OUTPUT)) { 268 err = -ENXIO; 269 goto __error; 270 } 271 if (subdevice >= 0 && (unsigned int)subdevice >= rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substream_count) { 272 err = -ENODEV; 273 goto __error; 274 } 275 if (rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substream_opened >= 276 rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substream_count) { 277 err = -EAGAIN; 278 goto __error; 279 } 280 } 281 list1 = rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams.next; 282 while (1) { 283 if (list1 == &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams) { 284 sinput = NULL; 285 if (mode & SNDRV_RAWMIDI_LFLG_INPUT) { 286 err = -EAGAIN; 287 goto __error; 288 } 289 break; 290 } 291 sinput = list_entry(list1, struct snd_rawmidi_substream, list); 292 if ((mode & SNDRV_RAWMIDI_LFLG_INPUT) && sinput->opened) 293 goto __nexti; 294 if (subdevice < 0 || (subdevice >= 0 && subdevice == sinput->number)) 295 break; 296 __nexti: 297 list1 = list1->next; 298 } 299 list2 = rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams.next; 300 while (1) { 301 if (list2 == &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams) { 302 soutput = NULL; 303 if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) { 304 err = -EAGAIN; 305 goto __error; 306 } 307 break; 308 } 309 soutput = list_entry(list2, struct snd_rawmidi_substream, list); 310 if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) { 311 if (mode & SNDRV_RAWMIDI_LFLG_APPEND) { 312 if (soutput->opened && !soutput->append) 313 goto __nexto; 314 } else { 315 if (soutput->opened) 316 goto __nexto; 317 } 318 } 319 if (subdevice < 0 || (subdevice >= 0 && subdevice == soutput->number)) 320 break; 321 __nexto: 322 list2 = list2->next; 323 } 324 if (mode & SNDRV_RAWMIDI_LFLG_INPUT) { 325 if ((err = snd_rawmidi_runtime_create(sinput)) < 0) 326 goto __error; 327 input = sinput->runtime; 328 if ((err = sinput->ops->open(sinput)) < 0) 329 goto __error; 330 sinput->opened = 1; 331 rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substream_opened++; 332 } else { 333 sinput = NULL; 334 } 335 if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) { 336 if (soutput->opened) 337 goto __skip_output; 338 if ((err = snd_rawmidi_runtime_create(soutput)) < 0) { 339 if (mode & SNDRV_RAWMIDI_LFLG_INPUT) 340 sinput->ops->close(sinput); 341 goto __error; 342 } 343 output = soutput->runtime; 344 if ((err = soutput->ops->open(soutput)) < 0) { 345 if (mode & SNDRV_RAWMIDI_LFLG_INPUT) 346 sinput->ops->close(sinput); 347 goto __error; 348 } 349 __skip_output: 350 soutput->opened = 1; 351 if (mode & SNDRV_RAWMIDI_LFLG_APPEND) 352 soutput->append = 1; 353 if (soutput->use_count++ == 0) 354 soutput->active_sensing = 1; 355 rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substream_opened++; 356 } else { 357 soutput = NULL; 358 } 359 if (!(mode & SNDRV_RAWMIDI_LFLG_NOOPENLOCK)) 360 mutex_unlock(&rmidi->open_mutex); 361 if (rfile) { 362 rfile->rmidi = rmidi; 363 rfile->input = sinput; 364 rfile->output = soutput; 365 } 366 return 0; 367 368 __error: 369 if (input != NULL) 370 snd_rawmidi_runtime_free(sinput); 371 if (output != NULL) 372 snd_rawmidi_runtime_free(soutput); 373 module_put(rmidi->card->module); 374 if (!(mode & SNDRV_RAWMIDI_LFLG_NOOPENLOCK)) 375 mutex_unlock(&rmidi->open_mutex); 376 __error1: 377 return err; 378 } 379 380 static int snd_rawmidi_open(struct inode *inode, struct file *file) 381 { 382 int maj = imajor(inode); 383 struct snd_card *card; 384 int subdevice; 385 unsigned short fflags; 386 int err; 387 struct snd_rawmidi *rmidi; 388 struct snd_rawmidi_file *rawmidi_file; 389 wait_queue_t wait; 390 struct snd_ctl_file *kctl; 391 392 if (maj == snd_major) { 393 rmidi = snd_lookup_minor_data(iminor(inode), 394 SNDRV_DEVICE_TYPE_RAWMIDI); 395 #ifdef CONFIG_SND_OSSEMUL 396 } else if (maj == SOUND_MAJOR) { 397 rmidi = snd_lookup_oss_minor_data(iminor(inode), 398 SNDRV_OSS_DEVICE_TYPE_MIDI); 399 #endif 400 } else 401 return -ENXIO; 402 403 if (rmidi == NULL) 404 return -ENODEV; 405 if ((file->f_flags & O_APPEND) && !(file->f_flags & O_NONBLOCK)) 406 return -EINVAL; /* invalid combination */ 407 card = rmidi->card; 408 err = snd_card_file_add(card, file); 409 if (err < 0) 410 return -ENODEV; 411 fflags = snd_rawmidi_file_flags(file); 412 if ((file->f_flags & O_APPEND) || maj == SOUND_MAJOR) /* OSS emul? */ 413 fflags |= SNDRV_RAWMIDI_LFLG_APPEND; 414 fflags |= SNDRV_RAWMIDI_LFLG_NOOPENLOCK; 415 rawmidi_file = kmalloc(sizeof(*rawmidi_file), GFP_KERNEL); 416 if (rawmidi_file == NULL) { 417 snd_card_file_remove(card, file); 418 return -ENOMEM; 419 } 420 init_waitqueue_entry(&wait, current); 421 add_wait_queue(&rmidi->open_wait, &wait); 422 mutex_lock(&rmidi->open_mutex); 423 while (1) { 424 subdevice = -1; 425 read_lock(&card->ctl_files_rwlock); 426 list_for_each_entry(kctl, &card->ctl_files, list) { 427 if (kctl->pid == current->pid) { 428 subdevice = kctl->prefer_rawmidi_subdevice; 429 if (subdevice != -1) 430 break; 431 } 432 } 433 read_unlock(&card->ctl_files_rwlock); 434 err = snd_rawmidi_kernel_open(rmidi->card, rmidi->device, 435 subdevice, fflags, rawmidi_file); 436 if (err >= 0) 437 break; 438 if (err == -EAGAIN) { 439 if (file->f_flags & O_NONBLOCK) { 440 err = -EBUSY; 441 break; 442 } 443 } else 444 break; 445 set_current_state(TASK_INTERRUPTIBLE); 446 mutex_unlock(&rmidi->open_mutex); 447 schedule(); 448 mutex_lock(&rmidi->open_mutex); 449 if (signal_pending(current)) { 450 err = -ERESTARTSYS; 451 break; 452 } 453 } 454 #ifdef CONFIG_SND_OSSEMUL 455 if (rawmidi_file->input && rawmidi_file->input->runtime) 456 rawmidi_file->input->runtime->oss = (maj == SOUND_MAJOR); 457 if (rawmidi_file->output && rawmidi_file->output->runtime) 458 rawmidi_file->output->runtime->oss = (maj == SOUND_MAJOR); 459 #endif 460 remove_wait_queue(&rmidi->open_wait, &wait); 461 if (err >= 0) { 462 file->private_data = rawmidi_file; 463 } else { 464 snd_card_file_remove(card, file); 465 kfree(rawmidi_file); 466 } 467 mutex_unlock(&rmidi->open_mutex); 468 return err; 469 } 470 471 int snd_rawmidi_kernel_release(struct snd_rawmidi_file * rfile) 472 { 473 struct snd_rawmidi *rmidi; 474 struct snd_rawmidi_substream *substream; 475 struct snd_rawmidi_runtime *runtime; 476 477 if (snd_BUG_ON(!rfile)) 478 return -ENXIO; 479 rmidi = rfile->rmidi; 480 mutex_lock(&rmidi->open_mutex); 481 if (rfile->input != NULL) { 482 substream = rfile->input; 483 rfile->input = NULL; 484 runtime = substream->runtime; 485 snd_rawmidi_input_trigger(substream, 0); 486 substream->ops->close(substream); 487 if (runtime->private_free != NULL) 488 runtime->private_free(substream); 489 snd_rawmidi_runtime_free(substream); 490 substream->opened = 0; 491 rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substream_opened--; 492 } 493 if (rfile->output != NULL) { 494 substream = rfile->output; 495 rfile->output = NULL; 496 if (--substream->use_count == 0) { 497 runtime = substream->runtime; 498 if (substream->active_sensing) { 499 unsigned char buf = 0xfe; 500 /* sending single active sensing message to shut the device up */ 501 snd_rawmidi_kernel_write(substream, &buf, 1); 502 } 503 if (snd_rawmidi_drain_output(substream) == -ERESTARTSYS) 504 snd_rawmidi_output_trigger(substream, 0); 505 substream->ops->close(substream); 506 if (runtime->private_free != NULL) 507 runtime->private_free(substream); 508 snd_rawmidi_runtime_free(substream); 509 substream->opened = 0; 510 substream->append = 0; 511 } 512 rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substream_opened--; 513 } 514 mutex_unlock(&rmidi->open_mutex); 515 module_put(rmidi->card->module); 516 return 0; 517 } 518 519 static int snd_rawmidi_release(struct inode *inode, struct file *file) 520 { 521 struct snd_rawmidi_file *rfile; 522 struct snd_rawmidi *rmidi; 523 int err; 524 525 rfile = file->private_data; 526 err = snd_rawmidi_kernel_release(rfile); 527 rmidi = rfile->rmidi; 528 wake_up(&rmidi->open_wait); 529 kfree(rfile); 530 snd_card_file_remove(rmidi->card, file); 531 return err; 532 } 533 534 static int snd_rawmidi_info(struct snd_rawmidi_substream *substream, 535 struct snd_rawmidi_info *info) 536 { 537 struct snd_rawmidi *rmidi; 538 539 if (substream == NULL) 540 return -ENODEV; 541 rmidi = substream->rmidi; 542 memset(info, 0, sizeof(*info)); 543 info->card = rmidi->card->number; 544 info->device = rmidi->device; 545 info->subdevice = substream->number; 546 info->stream = substream->stream; 547 info->flags = rmidi->info_flags; 548 strcpy(info->id, rmidi->id); 549 strcpy(info->name, rmidi->name); 550 strcpy(info->subname, substream->name); 551 info->subdevices_count = substream->pstr->substream_count; 552 info->subdevices_avail = (substream->pstr->substream_count - 553 substream->pstr->substream_opened); 554 return 0; 555 } 556 557 static int snd_rawmidi_info_user(struct snd_rawmidi_substream *substream, 558 struct snd_rawmidi_info __user * _info) 559 { 560 struct snd_rawmidi_info info; 561 int err; 562 if ((err = snd_rawmidi_info(substream, &info)) < 0) 563 return err; 564 if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info))) 565 return -EFAULT; 566 return 0; 567 } 568 569 int snd_rawmidi_info_select(struct snd_card *card, struct snd_rawmidi_info *info) 570 { 571 struct snd_rawmidi *rmidi; 572 struct snd_rawmidi_str *pstr; 573 struct snd_rawmidi_substream *substream; 574 575 mutex_lock(®ister_mutex); 576 rmidi = snd_rawmidi_search(card, info->device); 577 mutex_unlock(®ister_mutex); 578 if (!rmidi) 579 return -ENXIO; 580 if (info->stream < 0 || info->stream > 1) 581 return -EINVAL; 582 pstr = &rmidi->streams[info->stream]; 583 if (pstr->substream_count == 0) 584 return -ENOENT; 585 if (info->subdevice >= pstr->substream_count) 586 return -ENXIO; 587 list_for_each_entry(substream, &pstr->substreams, list) { 588 if ((unsigned int)substream->number == info->subdevice) 589 return snd_rawmidi_info(substream, info); 590 } 591 return -ENXIO; 592 } 593 594 static int snd_rawmidi_info_select_user(struct snd_card *card, 595 struct snd_rawmidi_info __user *_info) 596 { 597 int err; 598 struct snd_rawmidi_info info; 599 if (get_user(info.device, &_info->device)) 600 return -EFAULT; 601 if (get_user(info.stream, &_info->stream)) 602 return -EFAULT; 603 if (get_user(info.subdevice, &_info->subdevice)) 604 return -EFAULT; 605 if ((err = snd_rawmidi_info_select(card, &info)) < 0) 606 return err; 607 if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info))) 608 return -EFAULT; 609 return 0; 610 } 611 612 int snd_rawmidi_output_params(struct snd_rawmidi_substream *substream, 613 struct snd_rawmidi_params * params) 614 { 615 char *newbuf; 616 struct snd_rawmidi_runtime *runtime = substream->runtime; 617 618 if (substream->append && substream->use_count > 1) 619 return -EBUSY; 620 snd_rawmidi_drain_output(substream); 621 if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L) { 622 return -EINVAL; 623 } 624 if (params->avail_min < 1 || params->avail_min > params->buffer_size) { 625 return -EINVAL; 626 } 627 if (params->buffer_size != runtime->buffer_size) { 628 newbuf = kmalloc(params->buffer_size, GFP_KERNEL); 629 if (!newbuf) 630 return -ENOMEM; 631 kfree(runtime->buffer); 632 runtime->buffer = newbuf; 633 runtime->buffer_size = params->buffer_size; 634 runtime->avail = runtime->buffer_size; 635 } 636 runtime->avail_min = params->avail_min; 637 substream->active_sensing = !params->no_active_sensing; 638 return 0; 639 } 640 641 int snd_rawmidi_input_params(struct snd_rawmidi_substream *substream, 642 struct snd_rawmidi_params * params) 643 { 644 char *newbuf; 645 struct snd_rawmidi_runtime *runtime = substream->runtime; 646 647 snd_rawmidi_drain_input(substream); 648 if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L) { 649 return -EINVAL; 650 } 651 if (params->avail_min < 1 || params->avail_min > params->buffer_size) { 652 return -EINVAL; 653 } 654 if (params->buffer_size != runtime->buffer_size) { 655 newbuf = kmalloc(params->buffer_size, GFP_KERNEL); 656 if (!newbuf) 657 return -ENOMEM; 658 kfree(runtime->buffer); 659 runtime->buffer = newbuf; 660 runtime->buffer_size = params->buffer_size; 661 } 662 runtime->avail_min = params->avail_min; 663 return 0; 664 } 665 666 static int snd_rawmidi_output_status(struct snd_rawmidi_substream *substream, 667 struct snd_rawmidi_status * status) 668 { 669 struct snd_rawmidi_runtime *runtime = substream->runtime; 670 671 memset(status, 0, sizeof(*status)); 672 status->stream = SNDRV_RAWMIDI_STREAM_OUTPUT; 673 spin_lock_irq(&runtime->lock); 674 status->avail = runtime->avail; 675 spin_unlock_irq(&runtime->lock); 676 return 0; 677 } 678 679 static int snd_rawmidi_input_status(struct snd_rawmidi_substream *substream, 680 struct snd_rawmidi_status * status) 681 { 682 struct snd_rawmidi_runtime *runtime = substream->runtime; 683 684 memset(status, 0, sizeof(*status)); 685 status->stream = SNDRV_RAWMIDI_STREAM_INPUT; 686 spin_lock_irq(&runtime->lock); 687 status->avail = runtime->avail; 688 status->xruns = runtime->xruns; 689 runtime->xruns = 0; 690 spin_unlock_irq(&runtime->lock); 691 return 0; 692 } 693 694 static long snd_rawmidi_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 695 { 696 struct snd_rawmidi_file *rfile; 697 void __user *argp = (void __user *)arg; 698 699 rfile = file->private_data; 700 if (((cmd >> 8) & 0xff) != 'W') 701 return -ENOTTY; 702 switch (cmd) { 703 case SNDRV_RAWMIDI_IOCTL_PVERSION: 704 return put_user(SNDRV_RAWMIDI_VERSION, (int __user *)argp) ? -EFAULT : 0; 705 case SNDRV_RAWMIDI_IOCTL_INFO: 706 { 707 int stream; 708 struct snd_rawmidi_info __user *info = argp; 709 if (get_user(stream, &info->stream)) 710 return -EFAULT; 711 switch (stream) { 712 case SNDRV_RAWMIDI_STREAM_INPUT: 713 return snd_rawmidi_info_user(rfile->input, info); 714 case SNDRV_RAWMIDI_STREAM_OUTPUT: 715 return snd_rawmidi_info_user(rfile->output, info); 716 default: 717 return -EINVAL; 718 } 719 } 720 case SNDRV_RAWMIDI_IOCTL_PARAMS: 721 { 722 struct snd_rawmidi_params params; 723 if (copy_from_user(¶ms, argp, sizeof(struct snd_rawmidi_params))) 724 return -EFAULT; 725 switch (params.stream) { 726 case SNDRV_RAWMIDI_STREAM_OUTPUT: 727 if (rfile->output == NULL) 728 return -EINVAL; 729 return snd_rawmidi_output_params(rfile->output, ¶ms); 730 case SNDRV_RAWMIDI_STREAM_INPUT: 731 if (rfile->input == NULL) 732 return -EINVAL; 733 return snd_rawmidi_input_params(rfile->input, ¶ms); 734 default: 735 return -EINVAL; 736 } 737 } 738 case SNDRV_RAWMIDI_IOCTL_STATUS: 739 { 740 int err = 0; 741 struct snd_rawmidi_status status; 742 if (copy_from_user(&status, argp, sizeof(struct snd_rawmidi_status))) 743 return -EFAULT; 744 switch (status.stream) { 745 case SNDRV_RAWMIDI_STREAM_OUTPUT: 746 if (rfile->output == NULL) 747 return -EINVAL; 748 err = snd_rawmidi_output_status(rfile->output, &status); 749 break; 750 case SNDRV_RAWMIDI_STREAM_INPUT: 751 if (rfile->input == NULL) 752 return -EINVAL; 753 err = snd_rawmidi_input_status(rfile->input, &status); 754 break; 755 default: 756 return -EINVAL; 757 } 758 if (err < 0) 759 return err; 760 if (copy_to_user(argp, &status, sizeof(struct snd_rawmidi_status))) 761 return -EFAULT; 762 return 0; 763 } 764 case SNDRV_RAWMIDI_IOCTL_DROP: 765 { 766 int val; 767 if (get_user(val, (int __user *) argp)) 768 return -EFAULT; 769 switch (val) { 770 case SNDRV_RAWMIDI_STREAM_OUTPUT: 771 if (rfile->output == NULL) 772 return -EINVAL; 773 return snd_rawmidi_drop_output(rfile->output); 774 default: 775 return -EINVAL; 776 } 777 } 778 case SNDRV_RAWMIDI_IOCTL_DRAIN: 779 { 780 int val; 781 if (get_user(val, (int __user *) argp)) 782 return -EFAULT; 783 switch (val) { 784 case SNDRV_RAWMIDI_STREAM_OUTPUT: 785 if (rfile->output == NULL) 786 return -EINVAL; 787 return snd_rawmidi_drain_output(rfile->output); 788 case SNDRV_RAWMIDI_STREAM_INPUT: 789 if (rfile->input == NULL) 790 return -EINVAL; 791 return snd_rawmidi_drain_input(rfile->input); 792 default: 793 return -EINVAL; 794 } 795 } 796 #ifdef CONFIG_SND_DEBUG 797 default: 798 snd_printk(KERN_WARNING "rawmidi: unknown command = 0x%x\n", cmd); 799 #endif 800 } 801 return -ENOTTY; 802 } 803 804 static int snd_rawmidi_control_ioctl(struct snd_card *card, 805 struct snd_ctl_file *control, 806 unsigned int cmd, 807 unsigned long arg) 808 { 809 void __user *argp = (void __user *)arg; 810 811 switch (cmd) { 812 case SNDRV_CTL_IOCTL_RAWMIDI_NEXT_DEVICE: 813 { 814 int device; 815 816 if (get_user(device, (int __user *)argp)) 817 return -EFAULT; 818 mutex_lock(®ister_mutex); 819 device = device < 0 ? 0 : device + 1; 820 while (device < SNDRV_RAWMIDI_DEVICES) { 821 if (snd_rawmidi_search(card, device)) 822 break; 823 device++; 824 } 825 if (device == SNDRV_RAWMIDI_DEVICES) 826 device = -1; 827 mutex_unlock(®ister_mutex); 828 if (put_user(device, (int __user *)argp)) 829 return -EFAULT; 830 return 0; 831 } 832 case SNDRV_CTL_IOCTL_RAWMIDI_PREFER_SUBDEVICE: 833 { 834 int val; 835 836 if (get_user(val, (int __user *)argp)) 837 return -EFAULT; 838 control->prefer_rawmidi_subdevice = val; 839 return 0; 840 } 841 case SNDRV_CTL_IOCTL_RAWMIDI_INFO: 842 return snd_rawmidi_info_select_user(card, argp); 843 } 844 return -ENOIOCTLCMD; 845 } 846 847 /** 848 * snd_rawmidi_receive - receive the input data from the device 849 * @substream: the rawmidi substream 850 * @buffer: the buffer pointer 851 * @count: the data size to read 852 * 853 * Reads the data from the internal buffer. 854 * 855 * Returns the size of read data, or a negative error code on failure. 856 */ 857 int snd_rawmidi_receive(struct snd_rawmidi_substream *substream, 858 const unsigned char *buffer, int count) 859 { 860 unsigned long flags; 861 int result = 0, count1; 862 struct snd_rawmidi_runtime *runtime = substream->runtime; 863 864 if (!substream->opened) 865 return -EBADFD; 866 if (runtime->buffer == NULL) { 867 snd_printd("snd_rawmidi_receive: input is not active!!!\n"); 868 return -EINVAL; 869 } 870 spin_lock_irqsave(&runtime->lock, flags); 871 if (count == 1) { /* special case, faster code */ 872 substream->bytes++; 873 if (runtime->avail < runtime->buffer_size) { 874 runtime->buffer[runtime->hw_ptr++] = buffer[0]; 875 runtime->hw_ptr %= runtime->buffer_size; 876 runtime->avail++; 877 result++; 878 } else { 879 runtime->xruns++; 880 } 881 } else { 882 substream->bytes += count; 883 count1 = runtime->buffer_size - runtime->hw_ptr; 884 if (count1 > count) 885 count1 = count; 886 if (count1 > (int)(runtime->buffer_size - runtime->avail)) 887 count1 = runtime->buffer_size - runtime->avail; 888 memcpy(runtime->buffer + runtime->hw_ptr, buffer, count1); 889 runtime->hw_ptr += count1; 890 runtime->hw_ptr %= runtime->buffer_size; 891 runtime->avail += count1; 892 count -= count1; 893 result += count1; 894 if (count > 0) { 895 buffer += count1; 896 count1 = count; 897 if (count1 > (int)(runtime->buffer_size - runtime->avail)) { 898 count1 = runtime->buffer_size - runtime->avail; 899 runtime->xruns += count - count1; 900 } 901 if (count1 > 0) { 902 memcpy(runtime->buffer, buffer, count1); 903 runtime->hw_ptr = count1; 904 runtime->avail += count1; 905 result += count1; 906 } 907 } 908 } 909 if (result > 0) { 910 if (runtime->event) 911 tasklet_schedule(&runtime->tasklet); 912 else if (snd_rawmidi_ready(substream)) 913 wake_up(&runtime->sleep); 914 } 915 spin_unlock_irqrestore(&runtime->lock, flags); 916 return result; 917 } 918 919 static long snd_rawmidi_kernel_read1(struct snd_rawmidi_substream *substream, 920 unsigned char __user *userbuf, 921 unsigned char *kernelbuf, long count) 922 { 923 unsigned long flags; 924 long result = 0, count1; 925 struct snd_rawmidi_runtime *runtime = substream->runtime; 926 927 while (count > 0 && runtime->avail) { 928 count1 = runtime->buffer_size - runtime->appl_ptr; 929 if (count1 > count) 930 count1 = count; 931 spin_lock_irqsave(&runtime->lock, flags); 932 if (count1 > (int)runtime->avail) 933 count1 = runtime->avail; 934 if (kernelbuf) 935 memcpy(kernelbuf + result, runtime->buffer + runtime->appl_ptr, count1); 936 if (userbuf) { 937 spin_unlock_irqrestore(&runtime->lock, flags); 938 if (copy_to_user(userbuf + result, 939 runtime->buffer + runtime->appl_ptr, count1)) { 940 return result > 0 ? result : -EFAULT; 941 } 942 spin_lock_irqsave(&runtime->lock, flags); 943 } 944 runtime->appl_ptr += count1; 945 runtime->appl_ptr %= runtime->buffer_size; 946 runtime->avail -= count1; 947 spin_unlock_irqrestore(&runtime->lock, flags); 948 result += count1; 949 count -= count1; 950 } 951 return result; 952 } 953 954 long snd_rawmidi_kernel_read(struct snd_rawmidi_substream *substream, 955 unsigned char *buf, long count) 956 { 957 snd_rawmidi_input_trigger(substream, 1); 958 return snd_rawmidi_kernel_read1(substream, NULL/*userbuf*/, buf, count); 959 } 960 961 static ssize_t snd_rawmidi_read(struct file *file, char __user *buf, size_t count, 962 loff_t *offset) 963 { 964 long result; 965 int count1; 966 struct snd_rawmidi_file *rfile; 967 struct snd_rawmidi_substream *substream; 968 struct snd_rawmidi_runtime *runtime; 969 970 rfile = file->private_data; 971 substream = rfile->input; 972 if (substream == NULL) 973 return -EIO; 974 runtime = substream->runtime; 975 snd_rawmidi_input_trigger(substream, 1); 976 result = 0; 977 while (count > 0) { 978 spin_lock_irq(&runtime->lock); 979 while (!snd_rawmidi_ready(substream)) { 980 wait_queue_t wait; 981 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) { 982 spin_unlock_irq(&runtime->lock); 983 return result > 0 ? result : -EAGAIN; 984 } 985 init_waitqueue_entry(&wait, current); 986 add_wait_queue(&runtime->sleep, &wait); 987 set_current_state(TASK_INTERRUPTIBLE); 988 spin_unlock_irq(&runtime->lock); 989 schedule(); 990 remove_wait_queue(&runtime->sleep, &wait); 991 if (signal_pending(current)) 992 return result > 0 ? result : -ERESTARTSYS; 993 if (!runtime->avail) 994 return result > 0 ? result : -EIO; 995 spin_lock_irq(&runtime->lock); 996 } 997 spin_unlock_irq(&runtime->lock); 998 count1 = snd_rawmidi_kernel_read1(substream, 999 (unsigned char __user *)buf, 1000 NULL/*kernelbuf*/, 1001 count); 1002 if (count1 < 0) 1003 return result > 0 ? result : count1; 1004 result += count1; 1005 buf += count1; 1006 count -= count1; 1007 } 1008 return result; 1009 } 1010 1011 /** 1012 * snd_rawmidi_transmit_empty - check whether the output buffer is empty 1013 * @substream: the rawmidi substream 1014 * 1015 * Returns 1 if the internal output buffer is empty, 0 if not. 1016 */ 1017 int snd_rawmidi_transmit_empty(struct snd_rawmidi_substream *substream) 1018 { 1019 struct snd_rawmidi_runtime *runtime = substream->runtime; 1020 int result; 1021 unsigned long flags; 1022 1023 if (runtime->buffer == NULL) { 1024 snd_printd("snd_rawmidi_transmit_empty: output is not active!!!\n"); 1025 return 1; 1026 } 1027 spin_lock_irqsave(&runtime->lock, flags); 1028 result = runtime->avail >= runtime->buffer_size; 1029 spin_unlock_irqrestore(&runtime->lock, flags); 1030 return result; 1031 } 1032 1033 /** 1034 * snd_rawmidi_transmit_peek - copy data from the internal buffer 1035 * @substream: the rawmidi substream 1036 * @buffer: the buffer pointer 1037 * @count: data size to transfer 1038 * 1039 * Copies data from the internal output buffer to the given buffer. 1040 * 1041 * Call this in the interrupt handler when the midi output is ready, 1042 * and call snd_rawmidi_transmit_ack() after the transmission is 1043 * finished. 1044 * 1045 * Returns the size of copied data, or a negative error code on failure. 1046 */ 1047 int snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream, 1048 unsigned char *buffer, int count) 1049 { 1050 unsigned long flags; 1051 int result, count1; 1052 struct snd_rawmidi_runtime *runtime = substream->runtime; 1053 1054 if (runtime->buffer == NULL) { 1055 snd_printd("snd_rawmidi_transmit_peek: output is not active!!!\n"); 1056 return -EINVAL; 1057 } 1058 result = 0; 1059 spin_lock_irqsave(&runtime->lock, flags); 1060 if (runtime->avail >= runtime->buffer_size) { 1061 /* warning: lowlevel layer MUST trigger down the hardware */ 1062 goto __skip; 1063 } 1064 if (count == 1) { /* special case, faster code */ 1065 *buffer = runtime->buffer[runtime->hw_ptr]; 1066 result++; 1067 } else { 1068 count1 = runtime->buffer_size - runtime->hw_ptr; 1069 if (count1 > count) 1070 count1 = count; 1071 if (count1 > (int)(runtime->buffer_size - runtime->avail)) 1072 count1 = runtime->buffer_size - runtime->avail; 1073 memcpy(buffer, runtime->buffer + runtime->hw_ptr, count1); 1074 count -= count1; 1075 result += count1; 1076 if (count > 0) { 1077 if (count > (int)(runtime->buffer_size - runtime->avail - count1)) 1078 count = runtime->buffer_size - runtime->avail - count1; 1079 memcpy(buffer + count1, runtime->buffer, count); 1080 result += count; 1081 } 1082 } 1083 __skip: 1084 spin_unlock_irqrestore(&runtime->lock, flags); 1085 return result; 1086 } 1087 1088 /** 1089 * snd_rawmidi_transmit_ack - acknowledge the transmission 1090 * @substream: the rawmidi substream 1091 * @count: the tranferred count 1092 * 1093 * Advances the hardware pointer for the internal output buffer with 1094 * the given size and updates the condition. 1095 * Call after the transmission is finished. 1096 * 1097 * Returns the advanced size if successful, or a negative error code on failure. 1098 */ 1099 int snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count) 1100 { 1101 unsigned long flags; 1102 struct snd_rawmidi_runtime *runtime = substream->runtime; 1103 1104 if (runtime->buffer == NULL) { 1105 snd_printd("snd_rawmidi_transmit_ack: output is not active!!!\n"); 1106 return -EINVAL; 1107 } 1108 spin_lock_irqsave(&runtime->lock, flags); 1109 snd_BUG_ON(runtime->avail + count > runtime->buffer_size); 1110 runtime->hw_ptr += count; 1111 runtime->hw_ptr %= runtime->buffer_size; 1112 runtime->avail += count; 1113 substream->bytes += count; 1114 if (count > 0) { 1115 if (runtime->drain || snd_rawmidi_ready(substream)) 1116 wake_up(&runtime->sleep); 1117 } 1118 spin_unlock_irqrestore(&runtime->lock, flags); 1119 return count; 1120 } 1121 1122 /** 1123 * snd_rawmidi_transmit - copy from the buffer to the device 1124 * @substream: the rawmidi substream 1125 * @buffer: the buffer pointer 1126 * @count: the data size to transfer 1127 * 1128 * Copies data from the buffer to the device and advances the pointer. 1129 * 1130 * Returns the copied size if successful, or a negative error code on failure. 1131 */ 1132 int snd_rawmidi_transmit(struct snd_rawmidi_substream *substream, 1133 unsigned char *buffer, int count) 1134 { 1135 if (!substream->opened) 1136 return -EBADFD; 1137 count = snd_rawmidi_transmit_peek(substream, buffer, count); 1138 if (count < 0) 1139 return count; 1140 return snd_rawmidi_transmit_ack(substream, count); 1141 } 1142 1143 static long snd_rawmidi_kernel_write1(struct snd_rawmidi_substream *substream, 1144 const unsigned char __user *userbuf, 1145 const unsigned char *kernelbuf, 1146 long count) 1147 { 1148 unsigned long flags; 1149 long count1, result; 1150 struct snd_rawmidi_runtime *runtime = substream->runtime; 1151 1152 if (snd_BUG_ON(!kernelbuf && !userbuf)) 1153 return -EINVAL; 1154 if (snd_BUG_ON(!runtime->buffer)) 1155 return -EINVAL; 1156 1157 result = 0; 1158 spin_lock_irqsave(&runtime->lock, flags); 1159 if (substream->append) { 1160 if ((long)runtime->avail < count) { 1161 spin_unlock_irqrestore(&runtime->lock, flags); 1162 return -EAGAIN; 1163 } 1164 } 1165 while (count > 0 && runtime->avail > 0) { 1166 count1 = runtime->buffer_size - runtime->appl_ptr; 1167 if (count1 > count) 1168 count1 = count; 1169 if (count1 > (long)runtime->avail) 1170 count1 = runtime->avail; 1171 if (kernelbuf) 1172 memcpy(runtime->buffer + runtime->appl_ptr, 1173 kernelbuf + result, count1); 1174 else if (userbuf) { 1175 spin_unlock_irqrestore(&runtime->lock, flags); 1176 if (copy_from_user(runtime->buffer + runtime->appl_ptr, 1177 userbuf + result, count1)) { 1178 spin_lock_irqsave(&runtime->lock, flags); 1179 result = result > 0 ? result : -EFAULT; 1180 goto __end; 1181 } 1182 spin_lock_irqsave(&runtime->lock, flags); 1183 } 1184 runtime->appl_ptr += count1; 1185 runtime->appl_ptr %= runtime->buffer_size; 1186 runtime->avail -= count1; 1187 result += count1; 1188 count -= count1; 1189 } 1190 __end: 1191 count1 = runtime->avail < runtime->buffer_size; 1192 spin_unlock_irqrestore(&runtime->lock, flags); 1193 if (count1) 1194 snd_rawmidi_output_trigger(substream, 1); 1195 return result; 1196 } 1197 1198 long snd_rawmidi_kernel_write(struct snd_rawmidi_substream *substream, 1199 const unsigned char *buf, long count) 1200 { 1201 return snd_rawmidi_kernel_write1(substream, NULL, buf, count); 1202 } 1203 1204 static ssize_t snd_rawmidi_write(struct file *file, const char __user *buf, 1205 size_t count, loff_t *offset) 1206 { 1207 long result, timeout; 1208 int count1; 1209 struct snd_rawmidi_file *rfile; 1210 struct snd_rawmidi_runtime *runtime; 1211 struct snd_rawmidi_substream *substream; 1212 1213 rfile = file->private_data; 1214 substream = rfile->output; 1215 runtime = substream->runtime; 1216 /* we cannot put an atomic message to our buffer */ 1217 if (substream->append && count > runtime->buffer_size) 1218 return -EIO; 1219 result = 0; 1220 while (count > 0) { 1221 spin_lock_irq(&runtime->lock); 1222 while (!snd_rawmidi_ready_append(substream, count)) { 1223 wait_queue_t wait; 1224 if (file->f_flags & O_NONBLOCK) { 1225 spin_unlock_irq(&runtime->lock); 1226 return result > 0 ? result : -EAGAIN; 1227 } 1228 init_waitqueue_entry(&wait, current); 1229 add_wait_queue(&runtime->sleep, &wait); 1230 set_current_state(TASK_INTERRUPTIBLE); 1231 spin_unlock_irq(&runtime->lock); 1232 timeout = schedule_timeout(30 * HZ); 1233 remove_wait_queue(&runtime->sleep, &wait); 1234 if (signal_pending(current)) 1235 return result > 0 ? result : -ERESTARTSYS; 1236 if (!runtime->avail && !timeout) 1237 return result > 0 ? result : -EIO; 1238 spin_lock_irq(&runtime->lock); 1239 } 1240 spin_unlock_irq(&runtime->lock); 1241 count1 = snd_rawmidi_kernel_write1(substream, buf, NULL, count); 1242 if (count1 < 0) 1243 return result > 0 ? result : count1; 1244 result += count1; 1245 buf += count1; 1246 if ((size_t)count1 < count && (file->f_flags & O_NONBLOCK)) 1247 break; 1248 count -= count1; 1249 } 1250 if (file->f_flags & O_SYNC) { 1251 spin_lock_irq(&runtime->lock); 1252 while (runtime->avail != runtime->buffer_size) { 1253 wait_queue_t wait; 1254 unsigned int last_avail = runtime->avail; 1255 init_waitqueue_entry(&wait, current); 1256 add_wait_queue(&runtime->sleep, &wait); 1257 set_current_state(TASK_INTERRUPTIBLE); 1258 spin_unlock_irq(&runtime->lock); 1259 timeout = schedule_timeout(30 * HZ); 1260 remove_wait_queue(&runtime->sleep, &wait); 1261 if (signal_pending(current)) 1262 return result > 0 ? result : -ERESTARTSYS; 1263 if (runtime->avail == last_avail && !timeout) 1264 return result > 0 ? result : -EIO; 1265 spin_lock_irq(&runtime->lock); 1266 } 1267 spin_unlock_irq(&runtime->lock); 1268 } 1269 return result; 1270 } 1271 1272 static unsigned int snd_rawmidi_poll(struct file *file, poll_table * wait) 1273 { 1274 struct snd_rawmidi_file *rfile; 1275 struct snd_rawmidi_runtime *runtime; 1276 unsigned int mask; 1277 1278 rfile = file->private_data; 1279 if (rfile->input != NULL) { 1280 runtime = rfile->input->runtime; 1281 snd_rawmidi_input_trigger(rfile->input, 1); 1282 poll_wait(file, &runtime->sleep, wait); 1283 } 1284 if (rfile->output != NULL) { 1285 runtime = rfile->output->runtime; 1286 poll_wait(file, &runtime->sleep, wait); 1287 } 1288 mask = 0; 1289 if (rfile->input != NULL) { 1290 if (snd_rawmidi_ready(rfile->input)) 1291 mask |= POLLIN | POLLRDNORM; 1292 } 1293 if (rfile->output != NULL) { 1294 if (snd_rawmidi_ready(rfile->output)) 1295 mask |= POLLOUT | POLLWRNORM; 1296 } 1297 return mask; 1298 } 1299 1300 /* 1301 */ 1302 #ifdef CONFIG_COMPAT 1303 #include "rawmidi_compat.c" 1304 #else 1305 #define snd_rawmidi_ioctl_compat NULL 1306 #endif 1307 1308 /* 1309 1310 */ 1311 1312 static void snd_rawmidi_proc_info_read(struct snd_info_entry *entry, 1313 struct snd_info_buffer *buffer) 1314 { 1315 struct snd_rawmidi *rmidi; 1316 struct snd_rawmidi_substream *substream; 1317 struct snd_rawmidi_runtime *runtime; 1318 1319 rmidi = entry->private_data; 1320 snd_iprintf(buffer, "%s\n\n", rmidi->name); 1321 mutex_lock(&rmidi->open_mutex); 1322 if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_OUTPUT) { 1323 list_for_each_entry(substream, 1324 &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams, 1325 list) { 1326 snd_iprintf(buffer, 1327 "Output %d\n" 1328 " Tx bytes : %lu\n", 1329 substream->number, 1330 (unsigned long) substream->bytes); 1331 if (substream->opened) { 1332 runtime = substream->runtime; 1333 snd_iprintf(buffer, 1334 " Mode : %s\n" 1335 " Buffer size : %lu\n" 1336 " Avail : %lu\n", 1337 runtime->oss ? "OSS compatible" : "native", 1338 (unsigned long) runtime->buffer_size, 1339 (unsigned long) runtime->avail); 1340 } 1341 } 1342 } 1343 if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_INPUT) { 1344 list_for_each_entry(substream, 1345 &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams, 1346 list) { 1347 snd_iprintf(buffer, 1348 "Input %d\n" 1349 " Rx bytes : %lu\n", 1350 substream->number, 1351 (unsigned long) substream->bytes); 1352 if (substream->opened) { 1353 runtime = substream->runtime; 1354 snd_iprintf(buffer, 1355 " Buffer size : %lu\n" 1356 " Avail : %lu\n" 1357 " Overruns : %lu\n", 1358 (unsigned long) runtime->buffer_size, 1359 (unsigned long) runtime->avail, 1360 (unsigned long) runtime->xruns); 1361 } 1362 } 1363 } 1364 mutex_unlock(&rmidi->open_mutex); 1365 } 1366 1367 /* 1368 * Register functions 1369 */ 1370 1371 static const struct file_operations snd_rawmidi_f_ops = 1372 { 1373 .owner = THIS_MODULE, 1374 .read = snd_rawmidi_read, 1375 .write = snd_rawmidi_write, 1376 .open = snd_rawmidi_open, 1377 .release = snd_rawmidi_release, 1378 .poll = snd_rawmidi_poll, 1379 .unlocked_ioctl = snd_rawmidi_ioctl, 1380 .compat_ioctl = snd_rawmidi_ioctl_compat, 1381 }; 1382 1383 static int snd_rawmidi_alloc_substreams(struct snd_rawmidi *rmidi, 1384 struct snd_rawmidi_str *stream, 1385 int direction, 1386 int count) 1387 { 1388 struct snd_rawmidi_substream *substream; 1389 int idx; 1390 1391 for (idx = 0; idx < count; idx++) { 1392 substream = kzalloc(sizeof(*substream), GFP_KERNEL); 1393 if (substream == NULL) { 1394 snd_printk(KERN_ERR "rawmidi: cannot allocate substream\n"); 1395 return -ENOMEM; 1396 } 1397 substream->stream = direction; 1398 substream->number = idx; 1399 substream->rmidi = rmidi; 1400 substream->pstr = stream; 1401 list_add_tail(&substream->list, &stream->substreams); 1402 stream->substream_count++; 1403 } 1404 return 0; 1405 } 1406 1407 /** 1408 * snd_rawmidi_new - create a rawmidi instance 1409 * @card: the card instance 1410 * @id: the id string 1411 * @device: the device index 1412 * @output_count: the number of output streams 1413 * @input_count: the number of input streams 1414 * @rrawmidi: the pointer to store the new rawmidi instance 1415 * 1416 * Creates a new rawmidi instance. 1417 * Use snd_rawmidi_set_ops() to set the operators to the new instance. 1418 * 1419 * Returns zero if successful, or a negative error code on failure. 1420 */ 1421 int snd_rawmidi_new(struct snd_card *card, char *id, int device, 1422 int output_count, int input_count, 1423 struct snd_rawmidi ** rrawmidi) 1424 { 1425 struct snd_rawmidi *rmidi; 1426 int err; 1427 static struct snd_device_ops ops = { 1428 .dev_free = snd_rawmidi_dev_free, 1429 .dev_register = snd_rawmidi_dev_register, 1430 .dev_disconnect = snd_rawmidi_dev_disconnect, 1431 }; 1432 1433 if (snd_BUG_ON(!card)) 1434 return -ENXIO; 1435 if (rrawmidi) 1436 *rrawmidi = NULL; 1437 rmidi = kzalloc(sizeof(*rmidi), GFP_KERNEL); 1438 if (rmidi == NULL) { 1439 snd_printk(KERN_ERR "rawmidi: cannot allocate\n"); 1440 return -ENOMEM; 1441 } 1442 rmidi->card = card; 1443 rmidi->device = device; 1444 mutex_init(&rmidi->open_mutex); 1445 init_waitqueue_head(&rmidi->open_wait); 1446 INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams); 1447 INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams); 1448 1449 if (id != NULL) 1450 strlcpy(rmidi->id, id, sizeof(rmidi->id)); 1451 if ((err = snd_rawmidi_alloc_substreams(rmidi, 1452 &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT], 1453 SNDRV_RAWMIDI_STREAM_INPUT, 1454 input_count)) < 0) { 1455 snd_rawmidi_free(rmidi); 1456 return err; 1457 } 1458 if ((err = snd_rawmidi_alloc_substreams(rmidi, 1459 &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT], 1460 SNDRV_RAWMIDI_STREAM_OUTPUT, 1461 output_count)) < 0) { 1462 snd_rawmidi_free(rmidi); 1463 return err; 1464 } 1465 if ((err = snd_device_new(card, SNDRV_DEV_RAWMIDI, rmidi, &ops)) < 0) { 1466 snd_rawmidi_free(rmidi); 1467 return err; 1468 } 1469 if (rrawmidi) 1470 *rrawmidi = rmidi; 1471 return 0; 1472 } 1473 1474 static void snd_rawmidi_free_substreams(struct snd_rawmidi_str *stream) 1475 { 1476 struct snd_rawmidi_substream *substream; 1477 1478 while (!list_empty(&stream->substreams)) { 1479 substream = list_entry(stream->substreams.next, struct snd_rawmidi_substream, list); 1480 list_del(&substream->list); 1481 kfree(substream); 1482 } 1483 } 1484 1485 static int snd_rawmidi_free(struct snd_rawmidi *rmidi) 1486 { 1487 if (!rmidi) 1488 return 0; 1489 1490 snd_info_free_entry(rmidi->proc_entry); 1491 rmidi->proc_entry = NULL; 1492 mutex_lock(®ister_mutex); 1493 if (rmidi->ops && rmidi->ops->dev_unregister) 1494 rmidi->ops->dev_unregister(rmidi); 1495 mutex_unlock(®ister_mutex); 1496 1497 snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT]); 1498 snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT]); 1499 if (rmidi->private_free) 1500 rmidi->private_free(rmidi); 1501 kfree(rmidi); 1502 return 0; 1503 } 1504 1505 static int snd_rawmidi_dev_free(struct snd_device *device) 1506 { 1507 struct snd_rawmidi *rmidi = device->device_data; 1508 return snd_rawmidi_free(rmidi); 1509 } 1510 1511 #if defined(CONFIG_SND_SEQUENCER) || (defined(MODULE) && defined(CONFIG_SND_SEQUENCER_MODULE)) 1512 static void snd_rawmidi_dev_seq_free(struct snd_seq_device *device) 1513 { 1514 struct snd_rawmidi *rmidi = device->private_data; 1515 rmidi->seq_dev = NULL; 1516 } 1517 #endif 1518 1519 static int snd_rawmidi_dev_register(struct snd_device *device) 1520 { 1521 int err; 1522 struct snd_info_entry *entry; 1523 char name[16]; 1524 struct snd_rawmidi *rmidi = device->device_data; 1525 1526 if (rmidi->device >= SNDRV_RAWMIDI_DEVICES) 1527 return -ENOMEM; 1528 mutex_lock(®ister_mutex); 1529 if (snd_rawmidi_search(rmidi->card, rmidi->device)) { 1530 mutex_unlock(®ister_mutex); 1531 return -EBUSY; 1532 } 1533 list_add_tail(&rmidi->list, &snd_rawmidi_devices); 1534 sprintf(name, "midiC%iD%i", rmidi->card->number, rmidi->device); 1535 if ((err = snd_register_device(SNDRV_DEVICE_TYPE_RAWMIDI, 1536 rmidi->card, rmidi->device, 1537 &snd_rawmidi_f_ops, rmidi, name)) < 0) { 1538 snd_printk(KERN_ERR "unable to register rawmidi device %i:%i\n", rmidi->card->number, rmidi->device); 1539 list_del(&rmidi->list); 1540 mutex_unlock(®ister_mutex); 1541 return err; 1542 } 1543 if (rmidi->ops && rmidi->ops->dev_register && 1544 (err = rmidi->ops->dev_register(rmidi)) < 0) { 1545 snd_unregister_device(SNDRV_DEVICE_TYPE_RAWMIDI, rmidi->card, rmidi->device); 1546 list_del(&rmidi->list); 1547 mutex_unlock(®ister_mutex); 1548 return err; 1549 } 1550 #ifdef CONFIG_SND_OSSEMUL 1551 rmidi->ossreg = 0; 1552 if ((int)rmidi->device == midi_map[rmidi->card->number]) { 1553 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, 1554 rmidi->card, 0, &snd_rawmidi_f_ops, 1555 rmidi, name) < 0) { 1556 snd_printk(KERN_ERR "unable to register OSS rawmidi device %i:%i\n", rmidi->card->number, 0); 1557 } else { 1558 rmidi->ossreg++; 1559 #ifdef SNDRV_OSS_INFO_DEV_MIDI 1560 snd_oss_info_register(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number, rmidi->name); 1561 #endif 1562 } 1563 } 1564 if ((int)rmidi->device == amidi_map[rmidi->card->number]) { 1565 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, 1566 rmidi->card, 1, &snd_rawmidi_f_ops, 1567 rmidi, name) < 0) { 1568 snd_printk(KERN_ERR "unable to register OSS rawmidi device %i:%i\n", rmidi->card->number, 1); 1569 } else { 1570 rmidi->ossreg++; 1571 } 1572 } 1573 #endif /* CONFIG_SND_OSSEMUL */ 1574 mutex_unlock(®ister_mutex); 1575 sprintf(name, "midi%d", rmidi->device); 1576 entry = snd_info_create_card_entry(rmidi->card, name, rmidi->card->proc_root); 1577 if (entry) { 1578 entry->private_data = rmidi; 1579 entry->c.text.read = snd_rawmidi_proc_info_read; 1580 if (snd_info_register(entry) < 0) { 1581 snd_info_free_entry(entry); 1582 entry = NULL; 1583 } 1584 } 1585 rmidi->proc_entry = entry; 1586 #if defined(CONFIG_SND_SEQUENCER) || (defined(MODULE) && defined(CONFIG_SND_SEQUENCER_MODULE)) 1587 if (!rmidi->ops || !rmidi->ops->dev_register) { /* own registration mechanism */ 1588 if (snd_seq_device_new(rmidi->card, rmidi->device, SNDRV_SEQ_DEV_ID_MIDISYNTH, 0, &rmidi->seq_dev) >= 0) { 1589 rmidi->seq_dev->private_data = rmidi; 1590 rmidi->seq_dev->private_free = snd_rawmidi_dev_seq_free; 1591 sprintf(rmidi->seq_dev->name, "MIDI %d-%d", rmidi->card->number, rmidi->device); 1592 snd_device_register(rmidi->card, rmidi->seq_dev); 1593 } 1594 } 1595 #endif 1596 return 0; 1597 } 1598 1599 static int snd_rawmidi_dev_disconnect(struct snd_device *device) 1600 { 1601 struct snd_rawmidi *rmidi = device->device_data; 1602 1603 mutex_lock(®ister_mutex); 1604 list_del_init(&rmidi->list); 1605 #ifdef CONFIG_SND_OSSEMUL 1606 if (rmidi->ossreg) { 1607 if ((int)rmidi->device == midi_map[rmidi->card->number]) { 1608 snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 0); 1609 #ifdef SNDRV_OSS_INFO_DEV_MIDI 1610 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number); 1611 #endif 1612 } 1613 if ((int)rmidi->device == amidi_map[rmidi->card->number]) 1614 snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 1); 1615 rmidi->ossreg = 0; 1616 } 1617 #endif /* CONFIG_SND_OSSEMUL */ 1618 snd_unregister_device(SNDRV_DEVICE_TYPE_RAWMIDI, rmidi->card, rmidi->device); 1619 mutex_unlock(®ister_mutex); 1620 return 0; 1621 } 1622 1623 /** 1624 * snd_rawmidi_set_ops - set the rawmidi operators 1625 * @rmidi: the rawmidi instance 1626 * @stream: the stream direction, SNDRV_RAWMIDI_STREAM_XXX 1627 * @ops: the operator table 1628 * 1629 * Sets the rawmidi operators for the given stream direction. 1630 */ 1631 void snd_rawmidi_set_ops(struct snd_rawmidi *rmidi, int stream, 1632 struct snd_rawmidi_ops *ops) 1633 { 1634 struct snd_rawmidi_substream *substream; 1635 1636 list_for_each_entry(substream, &rmidi->streams[stream].substreams, list) 1637 substream->ops = ops; 1638 } 1639 1640 /* 1641 * ENTRY functions 1642 */ 1643 1644 static int __init alsa_rawmidi_init(void) 1645 { 1646 1647 snd_ctl_register_ioctl(snd_rawmidi_control_ioctl); 1648 snd_ctl_register_ioctl_compat(snd_rawmidi_control_ioctl); 1649 #ifdef CONFIG_SND_OSSEMUL 1650 { int i; 1651 /* check device map table */ 1652 for (i = 0; i < SNDRV_CARDS; i++) { 1653 if (midi_map[i] < 0 || midi_map[i] >= SNDRV_RAWMIDI_DEVICES) { 1654 snd_printk(KERN_ERR "invalid midi_map[%d] = %d\n", i, midi_map[i]); 1655 midi_map[i] = 0; 1656 } 1657 if (amidi_map[i] < 0 || amidi_map[i] >= SNDRV_RAWMIDI_DEVICES) { 1658 snd_printk(KERN_ERR "invalid amidi_map[%d] = %d\n", i, amidi_map[i]); 1659 amidi_map[i] = 1; 1660 } 1661 } 1662 } 1663 #endif /* CONFIG_SND_OSSEMUL */ 1664 return 0; 1665 } 1666 1667 static void __exit alsa_rawmidi_exit(void) 1668 { 1669 snd_ctl_unregister_ioctl(snd_rawmidi_control_ioctl); 1670 snd_ctl_unregister_ioctl_compat(snd_rawmidi_control_ioctl); 1671 } 1672 1673 module_init(alsa_rawmidi_init) 1674 module_exit(alsa_rawmidi_exit) 1675 1676 EXPORT_SYMBOL(snd_rawmidi_output_params); 1677 EXPORT_SYMBOL(snd_rawmidi_input_params); 1678 EXPORT_SYMBOL(snd_rawmidi_drop_output); 1679 EXPORT_SYMBOL(snd_rawmidi_drain_output); 1680 EXPORT_SYMBOL(snd_rawmidi_drain_input); 1681 EXPORT_SYMBOL(snd_rawmidi_receive); 1682 EXPORT_SYMBOL(snd_rawmidi_transmit_empty); 1683 EXPORT_SYMBOL(snd_rawmidi_transmit_peek); 1684 EXPORT_SYMBOL(snd_rawmidi_transmit_ack); 1685 EXPORT_SYMBOL(snd_rawmidi_transmit); 1686 EXPORT_SYMBOL(snd_rawmidi_new); 1687 EXPORT_SYMBOL(snd_rawmidi_set_ops); 1688 EXPORT_SYMBOL(snd_rawmidi_info_select); 1689 EXPORT_SYMBOL(snd_rawmidi_kernel_open); 1690 EXPORT_SYMBOL(snd_rawmidi_kernel_release); 1691 EXPORT_SYMBOL(snd_rawmidi_kernel_read); 1692 EXPORT_SYMBOL(snd_rawmidi_kernel_write); 1693