1 /* 2 * Abstract layer for MIDI v1.0 stream 3 * Copyright (c) by Jaroslav Kysela <perex@suse.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/driver.h> 23 #include <sound/core.h> 24 #include <linux/major.h> 25 #include <linux/init.h> 26 #include <linux/smp_lock.h> 27 #include <linux/sched.h> 28 #include <linux/slab.h> 29 #include <linux/time.h> 30 #include <linux/wait.h> 31 #include <linux/mutex.h> 32 #include <linux/moduleparam.h> 33 #include <linux/delay.h> 34 #include <linux/wait.h> 35 #include <sound/rawmidi.h> 36 #include <sound/info.h> 37 #include <sound/control.h> 38 #include <sound/minors.h> 39 #include <sound/initval.h> 40 41 MODULE_AUTHOR("Jaroslav Kysela <perex@suse.cz>"); 42 MODULE_DESCRIPTION("Midlevel RawMidi code for ALSA."); 43 MODULE_LICENSE("GPL"); 44 45 #ifdef CONFIG_SND_OSSEMUL 46 static int midi_map[SNDRV_CARDS]; 47 static int amidi_map[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS-1)] = 1}; 48 module_param_array(midi_map, int, NULL, 0444); 49 MODULE_PARM_DESC(midi_map, "Raw MIDI device number assigned to 1st OSS device."); 50 module_param_array(amidi_map, int, NULL, 0444); 51 MODULE_PARM_DESC(amidi_map, "Raw MIDI device number assigned to 2nd OSS device."); 52 #endif /* CONFIG_SND_OSSEMUL */ 53 54 static int snd_rawmidi_free(struct snd_rawmidi *rawmidi); 55 static int snd_rawmidi_dev_free(struct snd_device *device); 56 static int snd_rawmidi_dev_register(struct snd_device *device); 57 static int snd_rawmidi_dev_disconnect(struct snd_device *device); 58 59 static LIST_HEAD(snd_rawmidi_devices); 60 static DEFINE_MUTEX(register_mutex); 61 62 static struct snd_rawmidi *snd_rawmidi_search(struct snd_card *card, int device) 63 { 64 struct snd_rawmidi *rawmidi; 65 66 list_for_each_entry(rawmidi, &snd_rawmidi_devices, list) 67 if (rawmidi->card == card && rawmidi->device == device) 68 return rawmidi; 69 return NULL; 70 } 71 72 static inline unsigned short snd_rawmidi_file_flags(struct file *file) 73 { 74 switch (file->f_mode & (FMODE_READ | FMODE_WRITE)) { 75 case FMODE_WRITE: 76 return SNDRV_RAWMIDI_LFLG_OUTPUT; 77 case FMODE_READ: 78 return SNDRV_RAWMIDI_LFLG_INPUT; 79 default: 80 return SNDRV_RAWMIDI_LFLG_OPEN; 81 } 82 } 83 84 static inline int snd_rawmidi_ready(struct snd_rawmidi_substream *substream) 85 { 86 struct snd_rawmidi_runtime *runtime = substream->runtime; 87 return runtime->avail >= runtime->avail_min; 88 } 89 90 static inline int snd_rawmidi_ready_append(struct snd_rawmidi_substream *substream, 91 size_t count) 92 { 93 struct snd_rawmidi_runtime *runtime = substream->runtime; 94 return runtime->avail >= runtime->avail_min && 95 (!substream->append || runtime->avail >= count); 96 } 97 98 static void snd_rawmidi_input_event_tasklet(unsigned long data) 99 { 100 struct snd_rawmidi_substream *substream = (struct snd_rawmidi_substream *)data; 101 substream->runtime->event(substream); 102 } 103 104 static void snd_rawmidi_output_trigger_tasklet(unsigned long data) 105 { 106 struct snd_rawmidi_substream *substream = (struct snd_rawmidi_substream *)data; 107 substream->ops->trigger(substream, 1); 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 spin_lock_init(&runtime->lock); 117 init_waitqueue_head(&runtime->sleep); 118 if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT) 119 tasklet_init(&runtime->tasklet, 120 snd_rawmidi_input_event_tasklet, 121 (unsigned long)substream); 122 else 123 tasklet_init(&runtime->tasklet, 124 snd_rawmidi_output_trigger_tasklet, 125 (unsigned long)substream); 126 runtime->event = NULL; 127 runtime->buffer_size = PAGE_SIZE; 128 runtime->avail_min = 1; 129 if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT) 130 runtime->avail = 0; 131 else 132 runtime->avail = runtime->buffer_size; 133 if ((runtime->buffer = kmalloc(runtime->buffer_size, GFP_KERNEL)) == NULL) { 134 kfree(runtime); 135 return -ENOMEM; 136 } 137 runtime->appl_ptr = runtime->hw_ptr = 0; 138 substream->runtime = runtime; 139 return 0; 140 } 141 142 static int snd_rawmidi_runtime_free(struct snd_rawmidi_substream *substream) 143 { 144 struct snd_rawmidi_runtime *runtime = substream->runtime; 145 146 kfree(runtime->buffer); 147 kfree(runtime); 148 substream->runtime = NULL; 149 return 0; 150 } 151 152 static inline void snd_rawmidi_output_trigger(struct snd_rawmidi_substream *substream,int up) 153 { 154 if (up) { 155 tasklet_hi_schedule(&substream->runtime->tasklet); 156 } else { 157 tasklet_kill(&substream->runtime->tasklet); 158 substream->ops->trigger(substream, 0); 159 } 160 } 161 162 static void snd_rawmidi_input_trigger(struct snd_rawmidi_substream *substream, int up) 163 { 164 substream->ops->trigger(substream, up); 165 if (!up && substream->runtime->event) 166 tasklet_kill(&substream->runtime->tasklet); 167 } 168 169 int snd_rawmidi_drop_output(struct snd_rawmidi_substream *substream) 170 { 171 unsigned long flags; 172 struct snd_rawmidi_runtime *runtime = substream->runtime; 173 174 snd_rawmidi_output_trigger(substream, 0); 175 runtime->drain = 0; 176 spin_lock_irqsave(&runtime->lock, flags); 177 runtime->appl_ptr = runtime->hw_ptr = 0; 178 runtime->avail = runtime->buffer_size; 179 spin_unlock_irqrestore(&runtime->lock, flags); 180 return 0; 181 } 182 183 int snd_rawmidi_drain_output(struct snd_rawmidi_substream *substream) 184 { 185 int err; 186 long timeout; 187 struct snd_rawmidi_runtime *runtime = substream->runtime; 188 189 err = 0; 190 runtime->drain = 1; 191 timeout = wait_event_interruptible_timeout(runtime->sleep, 192 (runtime->avail >= runtime->buffer_size), 193 10*HZ); 194 if (signal_pending(current)) 195 err = -ERESTARTSYS; 196 if (runtime->avail < runtime->buffer_size && !timeout) { 197 snd_printk(KERN_WARNING "rawmidi drain error (avail = %li, buffer_size = %li)\n", (long)runtime->avail, (long)runtime->buffer_size); 198 err = -EIO; 199 } 200 runtime->drain = 0; 201 if (err != -ERESTARTSYS) { 202 /* we need wait a while to make sure that Tx FIFOs are empty */ 203 if (substream->ops->drain) 204 substream->ops->drain(substream); 205 else 206 msleep(50); 207 snd_rawmidi_drop_output(substream); 208 } 209 return err; 210 } 211 212 int snd_rawmidi_drain_input(struct snd_rawmidi_substream *substream) 213 { 214 unsigned long flags; 215 struct snd_rawmidi_runtime *runtime = substream->runtime; 216 217 snd_rawmidi_input_trigger(substream, 0); 218 runtime->drain = 0; 219 spin_lock_irqsave(&runtime->lock, flags); 220 runtime->appl_ptr = runtime->hw_ptr = 0; 221 runtime->avail = 0; 222 spin_unlock_irqrestore(&runtime->lock, flags); 223 return 0; 224 } 225 226 int snd_rawmidi_kernel_open(struct snd_card *card, int device, int subdevice, 227 int mode, struct snd_rawmidi_file * rfile) 228 { 229 struct snd_rawmidi *rmidi; 230 struct list_head *list1, *list2; 231 struct snd_rawmidi_substream *sinput = NULL, *soutput = NULL; 232 struct snd_rawmidi_runtime *input = NULL, *output = NULL; 233 int err; 234 235 if (rfile) 236 rfile->input = rfile->output = NULL; 237 mutex_lock(®ister_mutex); 238 rmidi = snd_rawmidi_search(card, device); 239 mutex_unlock(®ister_mutex); 240 if (rmidi == NULL) { 241 err = -ENODEV; 242 goto __error1; 243 } 244 if (!try_module_get(rmidi->card->module)) { 245 err = -EFAULT; 246 goto __error1; 247 } 248 if (!(mode & SNDRV_RAWMIDI_LFLG_NOOPENLOCK)) 249 mutex_lock(&rmidi->open_mutex); 250 if (mode & SNDRV_RAWMIDI_LFLG_INPUT) { 251 if (!(rmidi->info_flags & SNDRV_RAWMIDI_INFO_INPUT)) { 252 err = -ENXIO; 253 goto __error; 254 } 255 if (subdevice >= 0 && (unsigned int)subdevice >= rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substream_count) { 256 err = -ENODEV; 257 goto __error; 258 } 259 if (rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substream_opened >= 260 rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substream_count) { 261 err = -EAGAIN; 262 goto __error; 263 } 264 } 265 if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) { 266 if (!(rmidi->info_flags & SNDRV_RAWMIDI_INFO_OUTPUT)) { 267 err = -ENXIO; 268 goto __error; 269 } 270 if (subdevice >= 0 && (unsigned int)subdevice >= rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substream_count) { 271 err = -ENODEV; 272 goto __error; 273 } 274 if (rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substream_opened >= 275 rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substream_count) { 276 err = -EAGAIN; 277 goto __error; 278 } 279 } 280 list1 = rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams.next; 281 while (1) { 282 if (list1 == &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams) { 283 sinput = NULL; 284 if (mode & SNDRV_RAWMIDI_LFLG_INPUT) { 285 err = -EAGAIN; 286 goto __error; 287 } 288 break; 289 } 290 sinput = list_entry(list1, struct snd_rawmidi_substream, list); 291 if ((mode & SNDRV_RAWMIDI_LFLG_INPUT) && sinput->opened) 292 goto __nexti; 293 if (subdevice < 0 || (subdevice >= 0 && subdevice == sinput->number)) 294 break; 295 __nexti: 296 list1 = list1->next; 297 } 298 list2 = rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams.next; 299 while (1) { 300 if (list2 == &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams) { 301 soutput = NULL; 302 if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) { 303 err = -EAGAIN; 304 goto __error; 305 } 306 break; 307 } 308 soutput = list_entry(list2, struct snd_rawmidi_substream, list); 309 if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) { 310 if (mode & SNDRV_RAWMIDI_LFLG_APPEND) { 311 if (soutput->opened && !soutput->append) 312 goto __nexto; 313 } else { 314 if (soutput->opened) 315 goto __nexto; 316 } 317 } 318 if (subdevice < 0 || (subdevice >= 0 && subdevice == soutput->number)) 319 break; 320 __nexto: 321 list2 = list2->next; 322 } 323 if (mode & SNDRV_RAWMIDI_LFLG_INPUT) { 324 if ((err = snd_rawmidi_runtime_create(sinput)) < 0) 325 goto __error; 326 input = sinput->runtime; 327 if ((err = sinput->ops->open(sinput)) < 0) 328 goto __error; 329 sinput->opened = 1; 330 rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substream_opened++; 331 } else { 332 sinput = NULL; 333 } 334 if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) { 335 if (soutput->opened) 336 goto __skip_output; 337 if ((err = snd_rawmidi_runtime_create(soutput)) < 0) { 338 if (mode & SNDRV_RAWMIDI_LFLG_INPUT) 339 sinput->ops->close(sinput); 340 goto __error; 341 } 342 output = soutput->runtime; 343 if ((err = soutput->ops->open(soutput)) < 0) { 344 if (mode & SNDRV_RAWMIDI_LFLG_INPUT) 345 sinput->ops->close(sinput); 346 goto __error; 347 } 348 __skip_output: 349 soutput->opened = 1; 350 if (mode & SNDRV_RAWMIDI_LFLG_APPEND) 351 soutput->append = 1; 352 if (soutput->use_count++ == 0) 353 soutput->active_sensing = 1; 354 rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substream_opened++; 355 } else { 356 soutput = NULL; 357 } 358 if (!(mode & SNDRV_RAWMIDI_LFLG_NOOPENLOCK)) 359 mutex_unlock(&rmidi->open_mutex); 360 if (rfile) { 361 rfile->rmidi = rmidi; 362 rfile->input = sinput; 363 rfile->output = soutput; 364 } 365 return 0; 366 367 __error: 368 if (input != NULL) 369 snd_rawmidi_runtime_free(sinput); 370 if (output != NULL) 371 snd_rawmidi_runtime_free(soutput); 372 module_put(rmidi->card->module); 373 if (!(mode & SNDRV_RAWMIDI_LFLG_NOOPENLOCK)) 374 mutex_unlock(&rmidi->open_mutex); 375 __error1: 376 return err; 377 } 378 379 static int snd_rawmidi_open(struct inode *inode, struct file *file) 380 { 381 int maj = imajor(inode); 382 struct snd_card *card; 383 int subdevice; 384 unsigned short fflags; 385 int err; 386 struct snd_rawmidi *rmidi; 387 struct snd_rawmidi_file *rawmidi_file; 388 wait_queue_t wait; 389 struct snd_ctl_file *kctl; 390 391 if (maj == snd_major) { 392 rmidi = snd_lookup_minor_data(iminor(inode), 393 SNDRV_DEVICE_TYPE_RAWMIDI); 394 #ifdef CONFIG_SND_OSSEMUL 395 } else if (maj == SOUND_MAJOR) { 396 rmidi = snd_lookup_oss_minor_data(iminor(inode), 397 SNDRV_OSS_DEVICE_TYPE_MIDI); 398 #endif 399 } else 400 return -ENXIO; 401 402 if (rmidi == NULL) 403 return -ENODEV; 404 if ((file->f_flags & O_APPEND) && !(file->f_flags & O_NONBLOCK)) 405 return -EINVAL; /* invalid combination */ 406 card = rmidi->card; 407 err = snd_card_file_add(card, file); 408 if (err < 0) 409 return -ENODEV; 410 fflags = snd_rawmidi_file_flags(file); 411 if ((file->f_flags & O_APPEND) || maj == SOUND_MAJOR) /* OSS emul? */ 412 fflags |= SNDRV_RAWMIDI_LFLG_APPEND; 413 fflags |= SNDRV_RAWMIDI_LFLG_NOOPENLOCK; 414 rawmidi_file = kmalloc(sizeof(*rawmidi_file), GFP_KERNEL); 415 if (rawmidi_file == NULL) { 416 snd_card_file_remove(card, file); 417 return -ENOMEM; 418 } 419 init_waitqueue_entry(&wait, current); 420 add_wait_queue(&rmidi->open_wait, &wait); 421 mutex_lock(&rmidi->open_mutex); 422 while (1) { 423 subdevice = -1; 424 down_read(&card->controls_rwsem); 425 list_for_each_entry(kctl, &card->ctl_files, list) { 426 if (kctl->pid == current->pid) { 427 subdevice = kctl->prefer_rawmidi_subdevice; 428 if (subdevice != -1) 429 break; 430 } 431 } 432 up_read(&card->controls_rwsem); 433 err = snd_rawmidi_kernel_open(rmidi->card, rmidi->device, 434 subdevice, fflags, rawmidi_file); 435 if (err >= 0) 436 break; 437 if (err == -EAGAIN) { 438 if (file->f_flags & O_NONBLOCK) { 439 err = -EBUSY; 440 break; 441 } 442 } else 443 break; 444 set_current_state(TASK_INTERRUPTIBLE); 445 mutex_unlock(&rmidi->open_mutex); 446 schedule(); 447 mutex_lock(&rmidi->open_mutex); 448 if (signal_pending(current)) { 449 err = -ERESTARTSYS; 450 break; 451 } 452 } 453 #ifdef CONFIG_SND_OSSEMUL 454 if (rawmidi_file->input && rawmidi_file->input->runtime) 455 rawmidi_file->input->runtime->oss = (maj == SOUND_MAJOR); 456 if (rawmidi_file->output && rawmidi_file->output->runtime) 457 rawmidi_file->output->runtime->oss = (maj == SOUND_MAJOR); 458 #endif 459 remove_wait_queue(&rmidi->open_wait, &wait); 460 if (err >= 0) { 461 file->private_data = rawmidi_file; 462 } else { 463 snd_card_file_remove(card, file); 464 kfree(rawmidi_file); 465 } 466 mutex_unlock(&rmidi->open_mutex); 467 return err; 468 } 469 470 int snd_rawmidi_kernel_release(struct snd_rawmidi_file * rfile) 471 { 472 struct snd_rawmidi *rmidi; 473 struct snd_rawmidi_substream *substream; 474 struct snd_rawmidi_runtime *runtime; 475 476 snd_assert(rfile != NULL, return -ENXIO); 477 snd_assert(rfile->input != NULL || rfile->output != NULL, return -ENXIO); 478 rmidi = rfile->rmidi; 479 mutex_lock(&rmidi->open_mutex); 480 if (rfile->input != NULL) { 481 substream = rfile->input; 482 rfile->input = NULL; 483 runtime = substream->runtime; 484 snd_rawmidi_input_trigger(substream, 0); 485 substream->ops->close(substream); 486 if (runtime->private_free != NULL) 487 runtime->private_free(substream); 488 snd_rawmidi_runtime_free(substream); 489 substream->opened = 0; 490 rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substream_opened--; 491 } 492 if (rfile->output != NULL) { 493 substream = rfile->output; 494 rfile->output = NULL; 495 if (--substream->use_count == 0) { 496 runtime = substream->runtime; 497 if (substream->active_sensing) { 498 unsigned char buf = 0xfe; 499 /* sending single active sensing message to shut the device up */ 500 snd_rawmidi_kernel_write(substream, &buf, 1); 501 } 502 if (snd_rawmidi_drain_output(substream) == -ERESTARTSYS) 503 snd_rawmidi_output_trigger(substream, 0); 504 substream->ops->close(substream); 505 if (runtime->private_free != NULL) 506 runtime->private_free(substream); 507 snd_rawmidi_runtime_free(substream); 508 substream->opened = 0; 509 substream->append = 0; 510 } 511 rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substream_opened--; 512 } 513 mutex_unlock(&rmidi->open_mutex); 514 module_put(rmidi->card->module); 515 return 0; 516 } 517 518 static int snd_rawmidi_release(struct inode *inode, struct file *file) 519 { 520 struct snd_rawmidi_file *rfile; 521 struct snd_rawmidi *rmidi; 522 int err; 523 524 rfile = file->private_data; 525 err = snd_rawmidi_kernel_release(rfile); 526 rmidi = rfile->rmidi; 527 wake_up(&rmidi->open_wait); 528 kfree(rfile); 529 snd_card_file_remove(rmidi->card, file); 530 return err; 531 } 532 533 static int snd_rawmidi_info(struct snd_rawmidi_substream *substream, 534 struct snd_rawmidi_info *info) 535 { 536 struct snd_rawmidi *rmidi; 537 538 if (substream == NULL) 539 return -ENODEV; 540 rmidi = substream->rmidi; 541 memset(info, 0, sizeof(*info)); 542 info->card = rmidi->card->number; 543 info->device = rmidi->device; 544 info->subdevice = substream->number; 545 info->stream = substream->stream; 546 info->flags = rmidi->info_flags; 547 strcpy(info->id, rmidi->id); 548 strcpy(info->name, rmidi->name); 549 strcpy(info->subname, substream->name); 550 info->subdevices_count = substream->pstr->substream_count; 551 info->subdevices_avail = (substream->pstr->substream_count - 552 substream->pstr->substream_opened); 553 return 0; 554 } 555 556 static int snd_rawmidi_info_user(struct snd_rawmidi_substream *substream, 557 struct snd_rawmidi_info __user * _info) 558 { 559 struct snd_rawmidi_info info; 560 int err; 561 if ((err = snd_rawmidi_info(substream, &info)) < 0) 562 return err; 563 if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info))) 564 return -EFAULT; 565 return 0; 566 } 567 568 int snd_rawmidi_info_select(struct snd_card *card, struct snd_rawmidi_info *info) 569 { 570 struct snd_rawmidi *rmidi; 571 struct snd_rawmidi_str *pstr; 572 struct snd_rawmidi_substream *substream; 573 574 mutex_lock(®ister_mutex); 575 rmidi = snd_rawmidi_search(card, info->device); 576 mutex_unlock(®ister_mutex); 577 if (!rmidi) 578 return -ENXIO; 579 if (info->stream < 0 || info->stream > 1) 580 return -EINVAL; 581 pstr = &rmidi->streams[info->stream]; 582 if (pstr->substream_count == 0) 583 return -ENOENT; 584 if (info->subdevice >= pstr->substream_count) 585 return -ENXIO; 586 list_for_each_entry(substream, &pstr->substreams, list) { 587 if ((unsigned int)substream->number == info->subdevice) 588 return snd_rawmidi_info(substream, info); 589 } 590 return -ENXIO; 591 } 592 593 static int snd_rawmidi_info_select_user(struct snd_card *card, 594 struct snd_rawmidi_info __user *_info) 595 { 596 int err; 597 struct snd_rawmidi_info info; 598 if (get_user(info.device, &_info->device)) 599 return -EFAULT; 600 if (get_user(info.stream, &_info->stream)) 601 return -EFAULT; 602 if (get_user(info.subdevice, &_info->subdevice)) 603 return -EFAULT; 604 if ((err = snd_rawmidi_info_select(card, &info)) < 0) 605 return err; 606 if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info))) 607 return -EFAULT; 608 return 0; 609 } 610 611 int snd_rawmidi_output_params(struct snd_rawmidi_substream *substream, 612 struct snd_rawmidi_params * params) 613 { 614 char *newbuf; 615 struct snd_rawmidi_runtime *runtime = substream->runtime; 616 617 if (substream->append && substream->use_count > 1) 618 return -EBUSY; 619 snd_rawmidi_drain_output(substream); 620 if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L) { 621 return -EINVAL; 622 } 623 if (params->avail_min < 1 || params->avail_min > params->buffer_size) { 624 return -EINVAL; 625 } 626 if (params->buffer_size != runtime->buffer_size) { 627 newbuf = kmalloc(params->buffer_size, GFP_KERNEL); 628 if (!newbuf) 629 return -ENOMEM; 630 kfree(runtime->buffer); 631 runtime->buffer = newbuf; 632 runtime->buffer_size = params->buffer_size; 633 runtime->avail = runtime->buffer_size; 634 } 635 runtime->avail_min = params->avail_min; 636 substream->active_sensing = !params->no_active_sensing; 637 return 0; 638 } 639 640 int snd_rawmidi_input_params(struct snd_rawmidi_substream *substream, 641 struct snd_rawmidi_params * params) 642 { 643 char *newbuf; 644 struct snd_rawmidi_runtime *runtime = substream->runtime; 645 646 snd_rawmidi_drain_input(substream); 647 if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L) { 648 return -EINVAL; 649 } 650 if (params->avail_min < 1 || params->avail_min > params->buffer_size) { 651 return -EINVAL; 652 } 653 if (params->buffer_size != runtime->buffer_size) { 654 newbuf = kmalloc(params->buffer_size, GFP_KERNEL); 655 if (!newbuf) 656 return -ENOMEM; 657 kfree(runtime->buffer); 658 runtime->buffer = newbuf; 659 runtime->buffer_size = params->buffer_size; 660 } 661 runtime->avail_min = params->avail_min; 662 return 0; 663 } 664 665 static int snd_rawmidi_output_status(struct snd_rawmidi_substream *substream, 666 struct snd_rawmidi_status * status) 667 { 668 struct snd_rawmidi_runtime *runtime = substream->runtime; 669 670 memset(status, 0, sizeof(*status)); 671 status->stream = SNDRV_RAWMIDI_STREAM_OUTPUT; 672 spin_lock_irq(&runtime->lock); 673 status->avail = runtime->avail; 674 spin_unlock_irq(&runtime->lock); 675 return 0; 676 } 677 678 static int snd_rawmidi_input_status(struct snd_rawmidi_substream *substream, 679 struct snd_rawmidi_status * status) 680 { 681 struct snd_rawmidi_runtime *runtime = substream->runtime; 682 683 memset(status, 0, sizeof(*status)); 684 status->stream = SNDRV_RAWMIDI_STREAM_INPUT; 685 spin_lock_irq(&runtime->lock); 686 status->avail = runtime->avail; 687 status->xruns = runtime->xruns; 688 runtime->xruns = 0; 689 spin_unlock_irq(&runtime->lock); 690 return 0; 691 } 692 693 static long snd_rawmidi_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 694 { 695 struct snd_rawmidi_file *rfile; 696 void __user *argp = (void __user *)arg; 697 698 rfile = file->private_data; 699 if (((cmd >> 8) & 0xff) != 'W') 700 return -ENOTTY; 701 switch (cmd) { 702 case SNDRV_RAWMIDI_IOCTL_PVERSION: 703 return put_user(SNDRV_RAWMIDI_VERSION, (int __user *)argp) ? -EFAULT : 0; 704 case SNDRV_RAWMIDI_IOCTL_INFO: 705 { 706 int stream; 707 struct snd_rawmidi_info __user *info = argp; 708 if (get_user(stream, &info->stream)) 709 return -EFAULT; 710 switch (stream) { 711 case SNDRV_RAWMIDI_STREAM_INPUT: 712 return snd_rawmidi_info_user(rfile->input, info); 713 case SNDRV_RAWMIDI_STREAM_OUTPUT: 714 return snd_rawmidi_info_user(rfile->output, info); 715 default: 716 return -EINVAL; 717 } 718 } 719 case SNDRV_RAWMIDI_IOCTL_PARAMS: 720 { 721 struct snd_rawmidi_params params; 722 if (copy_from_user(¶ms, argp, sizeof(struct snd_rawmidi_params))) 723 return -EFAULT; 724 switch (params.stream) { 725 case SNDRV_RAWMIDI_STREAM_OUTPUT: 726 if (rfile->output == NULL) 727 return -EINVAL; 728 return snd_rawmidi_output_params(rfile->output, ¶ms); 729 case SNDRV_RAWMIDI_STREAM_INPUT: 730 if (rfile->input == NULL) 731 return -EINVAL; 732 return snd_rawmidi_input_params(rfile->input, ¶ms); 733 default: 734 return -EINVAL; 735 } 736 } 737 case SNDRV_RAWMIDI_IOCTL_STATUS: 738 { 739 int err = 0; 740 struct snd_rawmidi_status status; 741 if (copy_from_user(&status, argp, sizeof(struct snd_rawmidi_status))) 742 return -EFAULT; 743 switch (status.stream) { 744 case SNDRV_RAWMIDI_STREAM_OUTPUT: 745 if (rfile->output == NULL) 746 return -EINVAL; 747 err = snd_rawmidi_output_status(rfile->output, &status); 748 break; 749 case SNDRV_RAWMIDI_STREAM_INPUT: 750 if (rfile->input == NULL) 751 return -EINVAL; 752 err = snd_rawmidi_input_status(rfile->input, &status); 753 break; 754 default: 755 return -EINVAL; 756 } 757 if (err < 0) 758 return err; 759 if (copy_to_user(argp, &status, sizeof(struct snd_rawmidi_status))) 760 return -EFAULT; 761 return 0; 762 } 763 case SNDRV_RAWMIDI_IOCTL_DROP: 764 { 765 int val; 766 if (get_user(val, (int __user *) argp)) 767 return -EFAULT; 768 switch (val) { 769 case SNDRV_RAWMIDI_STREAM_OUTPUT: 770 if (rfile->output == NULL) 771 return -EINVAL; 772 return snd_rawmidi_drop_output(rfile->output); 773 default: 774 return -EINVAL; 775 } 776 } 777 case SNDRV_RAWMIDI_IOCTL_DRAIN: 778 { 779 int val; 780 if (get_user(val, (int __user *) argp)) 781 return -EFAULT; 782 switch (val) { 783 case SNDRV_RAWMIDI_STREAM_OUTPUT: 784 if (rfile->output == NULL) 785 return -EINVAL; 786 return snd_rawmidi_drain_output(rfile->output); 787 case SNDRV_RAWMIDI_STREAM_INPUT: 788 if (rfile->input == NULL) 789 return -EINVAL; 790 return snd_rawmidi_drain_input(rfile->input); 791 default: 792 return -EINVAL; 793 } 794 } 795 #ifdef CONFIG_SND_DEBUG 796 default: 797 snd_printk(KERN_WARNING "rawmidi: unknown command = 0x%x\n", cmd); 798 #endif 799 } 800 return -ENOTTY; 801 } 802 803 static int snd_rawmidi_control_ioctl(struct snd_card *card, 804 struct snd_ctl_file *control, 805 unsigned int cmd, 806 unsigned long arg) 807 { 808 void __user *argp = (void __user *)arg; 809 810 switch (cmd) { 811 case SNDRV_CTL_IOCTL_RAWMIDI_NEXT_DEVICE: 812 { 813 int device; 814 815 if (get_user(device, (int __user *)argp)) 816 return -EFAULT; 817 mutex_lock(®ister_mutex); 818 device = device < 0 ? 0 : device + 1; 819 while (device < SNDRV_RAWMIDI_DEVICES) { 820 if (snd_rawmidi_search(card, device)) 821 break; 822 device++; 823 } 824 if (device == SNDRV_RAWMIDI_DEVICES) 825 device = -1; 826 mutex_unlock(®ister_mutex); 827 if (put_user(device, (int __user *)argp)) 828 return -EFAULT; 829 return 0; 830 } 831 case SNDRV_CTL_IOCTL_RAWMIDI_PREFER_SUBDEVICE: 832 { 833 int val; 834 835 if (get_user(val, (int __user *)argp)) 836 return -EFAULT; 837 control->prefer_rawmidi_subdevice = val; 838 return 0; 839 } 840 case SNDRV_CTL_IOCTL_RAWMIDI_INFO: 841 return snd_rawmidi_info_select_user(card, argp); 842 } 843 return -ENOIOCTLCMD; 844 } 845 846 /** 847 * snd_rawmidi_receive - receive the input data from the device 848 * @substream: the rawmidi substream 849 * @buffer: the buffer pointer 850 * @count: the data size to read 851 * 852 * Reads the data from the internal buffer. 853 * 854 * Returns the size of read data, or a negative error code on failure. 855 */ 856 int snd_rawmidi_receive(struct snd_rawmidi_substream *substream, 857 const unsigned char *buffer, int count) 858 { 859 unsigned long flags; 860 int result = 0, count1; 861 struct snd_rawmidi_runtime *runtime = substream->runtime; 862 863 if (runtime->buffer == NULL) { 864 snd_printd("snd_rawmidi_receive: input is not active!!!\n"); 865 return -EINVAL; 866 } 867 spin_lock_irqsave(&runtime->lock, flags); 868 if (count == 1) { /* special case, faster code */ 869 substream->bytes++; 870 if (runtime->avail < runtime->buffer_size) { 871 runtime->buffer[runtime->hw_ptr++] = buffer[0]; 872 runtime->hw_ptr %= runtime->buffer_size; 873 runtime->avail++; 874 result++; 875 } else { 876 runtime->xruns++; 877 } 878 } else { 879 substream->bytes += count; 880 count1 = runtime->buffer_size - runtime->hw_ptr; 881 if (count1 > count) 882 count1 = count; 883 if (count1 > (int)(runtime->buffer_size - runtime->avail)) 884 count1 = runtime->buffer_size - runtime->avail; 885 memcpy(runtime->buffer + runtime->hw_ptr, buffer, count1); 886 runtime->hw_ptr += count1; 887 runtime->hw_ptr %= runtime->buffer_size; 888 runtime->avail += count1; 889 count -= count1; 890 result += count1; 891 if (count > 0) { 892 buffer += count1; 893 count1 = count; 894 if (count1 > (int)(runtime->buffer_size - runtime->avail)) { 895 count1 = runtime->buffer_size - runtime->avail; 896 runtime->xruns += count - count1; 897 } 898 if (count1 > 0) { 899 memcpy(runtime->buffer, buffer, count1); 900 runtime->hw_ptr = count1; 901 runtime->avail += count1; 902 result += count1; 903 } 904 } 905 } 906 if (result > 0) { 907 if (runtime->event) 908 tasklet_hi_schedule(&runtime->tasklet); 909 else if (snd_rawmidi_ready(substream)) 910 wake_up(&runtime->sleep); 911 } 912 spin_unlock_irqrestore(&runtime->lock, flags); 913 return result; 914 } 915 916 static long snd_rawmidi_kernel_read1(struct snd_rawmidi_substream *substream, 917 unsigned char *buf, long count, int kernel) 918 { 919 unsigned long flags; 920 long result = 0, count1; 921 struct snd_rawmidi_runtime *runtime = substream->runtime; 922 923 while (count > 0 && runtime->avail) { 924 count1 = runtime->buffer_size - runtime->appl_ptr; 925 if (count1 > count) 926 count1 = count; 927 spin_lock_irqsave(&runtime->lock, flags); 928 if (count1 > (int)runtime->avail) 929 count1 = runtime->avail; 930 if (kernel) { 931 memcpy(buf + result, runtime->buffer + runtime->appl_ptr, count1); 932 } else { 933 spin_unlock_irqrestore(&runtime->lock, flags); 934 if (copy_to_user((char __user *)buf + result, 935 runtime->buffer + runtime->appl_ptr, count1)) { 936 return result > 0 ? result : -EFAULT; 937 } 938 spin_lock_irqsave(&runtime->lock, flags); 939 } 940 runtime->appl_ptr += count1; 941 runtime->appl_ptr %= runtime->buffer_size; 942 runtime->avail -= count1; 943 spin_unlock_irqrestore(&runtime->lock, flags); 944 result += count1; 945 count -= count1; 946 } 947 return result; 948 } 949 950 long snd_rawmidi_kernel_read(struct snd_rawmidi_substream *substream, 951 unsigned char *buf, long count) 952 { 953 snd_rawmidi_input_trigger(substream, 1); 954 return snd_rawmidi_kernel_read1(substream, buf, count, 1); 955 } 956 957 static ssize_t snd_rawmidi_read(struct file *file, char __user *buf, size_t count, 958 loff_t *offset) 959 { 960 long result; 961 int count1; 962 struct snd_rawmidi_file *rfile; 963 struct snd_rawmidi_substream *substream; 964 struct snd_rawmidi_runtime *runtime; 965 966 rfile = file->private_data; 967 substream = rfile->input; 968 if (substream == NULL) 969 return -EIO; 970 runtime = substream->runtime; 971 snd_rawmidi_input_trigger(substream, 1); 972 result = 0; 973 while (count > 0) { 974 spin_lock_irq(&runtime->lock); 975 while (!snd_rawmidi_ready(substream)) { 976 wait_queue_t wait; 977 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) { 978 spin_unlock_irq(&runtime->lock); 979 return result > 0 ? result : -EAGAIN; 980 } 981 init_waitqueue_entry(&wait, current); 982 add_wait_queue(&runtime->sleep, &wait); 983 set_current_state(TASK_INTERRUPTIBLE); 984 spin_unlock_irq(&runtime->lock); 985 schedule(); 986 remove_wait_queue(&runtime->sleep, &wait); 987 if (signal_pending(current)) 988 return result > 0 ? result : -ERESTARTSYS; 989 if (!runtime->avail) 990 return result > 0 ? result : -EIO; 991 spin_lock_irq(&runtime->lock); 992 } 993 spin_unlock_irq(&runtime->lock); 994 count1 = snd_rawmidi_kernel_read1(substream, 995 (unsigned char __force *)buf, 996 count, 0); 997 if (count1 < 0) 998 return result > 0 ? result : count1; 999 result += count1; 1000 buf += count1; 1001 count -= count1; 1002 } 1003 return result; 1004 } 1005 1006 /** 1007 * snd_rawmidi_transmit_empty - check whether the output buffer is empty 1008 * @substream: the rawmidi substream 1009 * 1010 * Returns 1 if the internal output buffer is empty, 0 if not. 1011 */ 1012 int snd_rawmidi_transmit_empty(struct snd_rawmidi_substream *substream) 1013 { 1014 struct snd_rawmidi_runtime *runtime = substream->runtime; 1015 int result; 1016 unsigned long flags; 1017 1018 if (runtime->buffer == NULL) { 1019 snd_printd("snd_rawmidi_transmit_empty: output is not active!!!\n"); 1020 return 1; 1021 } 1022 spin_lock_irqsave(&runtime->lock, flags); 1023 result = runtime->avail >= runtime->buffer_size; 1024 spin_unlock_irqrestore(&runtime->lock, flags); 1025 return result; 1026 } 1027 1028 /** 1029 * snd_rawmidi_transmit_peek - copy data from the internal buffer 1030 * @substream: the rawmidi substream 1031 * @buffer: the buffer pointer 1032 * @count: data size to transfer 1033 * 1034 * Copies data from the internal output buffer to the given buffer. 1035 * 1036 * Call this in the interrupt handler when the midi output is ready, 1037 * and call snd_rawmidi_transmit_ack() after the transmission is 1038 * finished. 1039 * 1040 * Returns the size of copied data, or a negative error code on failure. 1041 */ 1042 int snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream, 1043 unsigned char *buffer, int count) 1044 { 1045 unsigned long flags; 1046 int result, count1; 1047 struct snd_rawmidi_runtime *runtime = substream->runtime; 1048 1049 if (runtime->buffer == NULL) { 1050 snd_printd("snd_rawmidi_transmit_peek: output is not active!!!\n"); 1051 return -EINVAL; 1052 } 1053 result = 0; 1054 spin_lock_irqsave(&runtime->lock, flags); 1055 if (runtime->avail >= runtime->buffer_size) { 1056 /* warning: lowlevel layer MUST trigger down the hardware */ 1057 goto __skip; 1058 } 1059 if (count == 1) { /* special case, faster code */ 1060 *buffer = runtime->buffer[runtime->hw_ptr]; 1061 result++; 1062 } else { 1063 count1 = runtime->buffer_size - runtime->hw_ptr; 1064 if (count1 > count) 1065 count1 = count; 1066 if (count1 > (int)(runtime->buffer_size - runtime->avail)) 1067 count1 = runtime->buffer_size - runtime->avail; 1068 memcpy(buffer, runtime->buffer + runtime->hw_ptr, count1); 1069 count -= count1; 1070 result += count1; 1071 if (count > 0) { 1072 if (count > (int)(runtime->buffer_size - runtime->avail - count1)) 1073 count = runtime->buffer_size - runtime->avail - count1; 1074 memcpy(buffer + count1, runtime->buffer, count); 1075 result += count; 1076 } 1077 } 1078 __skip: 1079 spin_unlock_irqrestore(&runtime->lock, flags); 1080 return result; 1081 } 1082 1083 /** 1084 * snd_rawmidi_transmit_ack - acknowledge the transmission 1085 * @substream: the rawmidi substream 1086 * @count: the tranferred count 1087 * 1088 * Advances the hardware pointer for the internal output buffer with 1089 * the given size and updates the condition. 1090 * Call after the transmission is finished. 1091 * 1092 * Returns the advanced size if successful, or a negative error code on failure. 1093 */ 1094 int snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count) 1095 { 1096 unsigned long flags; 1097 struct snd_rawmidi_runtime *runtime = substream->runtime; 1098 1099 if (runtime->buffer == NULL) { 1100 snd_printd("snd_rawmidi_transmit_ack: output is not active!!!\n"); 1101 return -EINVAL; 1102 } 1103 spin_lock_irqsave(&runtime->lock, flags); 1104 snd_assert(runtime->avail + count <= runtime->buffer_size, ); 1105 runtime->hw_ptr += count; 1106 runtime->hw_ptr %= runtime->buffer_size; 1107 runtime->avail += count; 1108 substream->bytes += count; 1109 if (count > 0) { 1110 if (runtime->drain || snd_rawmidi_ready(substream)) 1111 wake_up(&runtime->sleep); 1112 } 1113 spin_unlock_irqrestore(&runtime->lock, flags); 1114 return count; 1115 } 1116 1117 /** 1118 * snd_rawmidi_transmit - copy from the buffer to the device 1119 * @substream: the rawmidi substream 1120 * @buffer: the buffer pointer 1121 * @count: the data size to transfer 1122 * 1123 * Copies data from the buffer to the device and advances the pointer. 1124 * 1125 * Returns the copied size if successful, or a negative error code on failure. 1126 */ 1127 int snd_rawmidi_transmit(struct snd_rawmidi_substream *substream, 1128 unsigned char *buffer, int count) 1129 { 1130 count = snd_rawmidi_transmit_peek(substream, buffer, count); 1131 if (count < 0) 1132 return count; 1133 return snd_rawmidi_transmit_ack(substream, count); 1134 } 1135 1136 static long snd_rawmidi_kernel_write1(struct snd_rawmidi_substream *substream, 1137 const unsigned char *buf, long count, int kernel) 1138 { 1139 unsigned long flags; 1140 long count1, result; 1141 struct snd_rawmidi_runtime *runtime = substream->runtime; 1142 1143 snd_assert(buf != NULL, return -EINVAL); 1144 snd_assert(runtime->buffer != NULL, return -EINVAL); 1145 1146 result = 0; 1147 spin_lock_irqsave(&runtime->lock, flags); 1148 if (substream->append) { 1149 if ((long)runtime->avail < count) { 1150 spin_unlock_irqrestore(&runtime->lock, flags); 1151 return -EAGAIN; 1152 } 1153 } 1154 while (count > 0 && runtime->avail > 0) { 1155 count1 = runtime->buffer_size - runtime->appl_ptr; 1156 if (count1 > count) 1157 count1 = count; 1158 if (count1 > (long)runtime->avail) 1159 count1 = runtime->avail; 1160 if (kernel) { 1161 memcpy(runtime->buffer + runtime->appl_ptr, buf, count1); 1162 } else { 1163 spin_unlock_irqrestore(&runtime->lock, flags); 1164 if (copy_from_user(runtime->buffer + runtime->appl_ptr, 1165 (char __user *)buf, count1)) { 1166 spin_lock_irqsave(&runtime->lock, flags); 1167 result = result > 0 ? result : -EFAULT; 1168 goto __end; 1169 } 1170 spin_lock_irqsave(&runtime->lock, flags); 1171 } 1172 runtime->appl_ptr += count1; 1173 runtime->appl_ptr %= runtime->buffer_size; 1174 runtime->avail -= count1; 1175 result += count1; 1176 buf += count1; 1177 count -= count1; 1178 } 1179 __end: 1180 count1 = runtime->avail < runtime->buffer_size; 1181 spin_unlock_irqrestore(&runtime->lock, flags); 1182 if (count1) 1183 snd_rawmidi_output_trigger(substream, 1); 1184 return result; 1185 } 1186 1187 long snd_rawmidi_kernel_write(struct snd_rawmidi_substream *substream, 1188 const unsigned char *buf, long count) 1189 { 1190 return snd_rawmidi_kernel_write1(substream, buf, count, 1); 1191 } 1192 1193 static ssize_t snd_rawmidi_write(struct file *file, const char __user *buf, 1194 size_t count, loff_t *offset) 1195 { 1196 long result, timeout; 1197 int count1; 1198 struct snd_rawmidi_file *rfile; 1199 struct snd_rawmidi_runtime *runtime; 1200 struct snd_rawmidi_substream *substream; 1201 1202 rfile = file->private_data; 1203 substream = rfile->output; 1204 runtime = substream->runtime; 1205 /* we cannot put an atomic message to our buffer */ 1206 if (substream->append && count > runtime->buffer_size) 1207 return -EIO; 1208 result = 0; 1209 while (count > 0) { 1210 spin_lock_irq(&runtime->lock); 1211 while (!snd_rawmidi_ready_append(substream, count)) { 1212 wait_queue_t wait; 1213 if (file->f_flags & O_NONBLOCK) { 1214 spin_unlock_irq(&runtime->lock); 1215 return result > 0 ? result : -EAGAIN; 1216 } 1217 init_waitqueue_entry(&wait, current); 1218 add_wait_queue(&runtime->sleep, &wait); 1219 set_current_state(TASK_INTERRUPTIBLE); 1220 spin_unlock_irq(&runtime->lock); 1221 timeout = schedule_timeout(30 * HZ); 1222 remove_wait_queue(&runtime->sleep, &wait); 1223 if (signal_pending(current)) 1224 return result > 0 ? result : -ERESTARTSYS; 1225 if (!runtime->avail && !timeout) 1226 return result > 0 ? result : -EIO; 1227 spin_lock_irq(&runtime->lock); 1228 } 1229 spin_unlock_irq(&runtime->lock); 1230 count1 = snd_rawmidi_kernel_write1(substream, 1231 (unsigned char __force *)buf, 1232 count, 0); 1233 if (count1 < 0) 1234 return result > 0 ? result : count1; 1235 result += count1; 1236 buf += count1; 1237 if ((size_t)count1 < count && (file->f_flags & O_NONBLOCK)) 1238 break; 1239 count -= count1; 1240 } 1241 if (file->f_flags & O_SYNC) { 1242 spin_lock_irq(&runtime->lock); 1243 while (runtime->avail != runtime->buffer_size) { 1244 wait_queue_t wait; 1245 unsigned int last_avail = runtime->avail; 1246 init_waitqueue_entry(&wait, current); 1247 add_wait_queue(&runtime->sleep, &wait); 1248 set_current_state(TASK_INTERRUPTIBLE); 1249 spin_unlock_irq(&runtime->lock); 1250 timeout = schedule_timeout(30 * HZ); 1251 remove_wait_queue(&runtime->sleep, &wait); 1252 if (signal_pending(current)) 1253 return result > 0 ? result : -ERESTARTSYS; 1254 if (runtime->avail == last_avail && !timeout) 1255 return result > 0 ? result : -EIO; 1256 spin_lock_irq(&runtime->lock); 1257 } 1258 spin_unlock_irq(&runtime->lock); 1259 } 1260 return result; 1261 } 1262 1263 static unsigned int snd_rawmidi_poll(struct file *file, poll_table * wait) 1264 { 1265 struct snd_rawmidi_file *rfile; 1266 struct snd_rawmidi_runtime *runtime; 1267 unsigned int mask; 1268 1269 rfile = file->private_data; 1270 if (rfile->input != NULL) { 1271 runtime = rfile->input->runtime; 1272 snd_rawmidi_input_trigger(rfile->input, 1); 1273 poll_wait(file, &runtime->sleep, wait); 1274 } 1275 if (rfile->output != NULL) { 1276 runtime = rfile->output->runtime; 1277 poll_wait(file, &runtime->sleep, wait); 1278 } 1279 mask = 0; 1280 if (rfile->input != NULL) { 1281 if (snd_rawmidi_ready(rfile->input)) 1282 mask |= POLLIN | POLLRDNORM; 1283 } 1284 if (rfile->output != NULL) { 1285 if (snd_rawmidi_ready(rfile->output)) 1286 mask |= POLLOUT | POLLWRNORM; 1287 } 1288 return mask; 1289 } 1290 1291 /* 1292 */ 1293 #ifdef CONFIG_COMPAT 1294 #include "rawmidi_compat.c" 1295 #else 1296 #define snd_rawmidi_ioctl_compat NULL 1297 #endif 1298 1299 /* 1300 1301 */ 1302 1303 static void snd_rawmidi_proc_info_read(struct snd_info_entry *entry, 1304 struct snd_info_buffer *buffer) 1305 { 1306 struct snd_rawmidi *rmidi; 1307 struct snd_rawmidi_substream *substream; 1308 struct snd_rawmidi_runtime *runtime; 1309 1310 rmidi = entry->private_data; 1311 snd_iprintf(buffer, "%s\n\n", rmidi->name); 1312 mutex_lock(&rmidi->open_mutex); 1313 if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_OUTPUT) { 1314 list_for_each_entry(substream, 1315 &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams, 1316 list) { 1317 snd_iprintf(buffer, 1318 "Output %d\n" 1319 " Tx bytes : %lu\n", 1320 substream->number, 1321 (unsigned long) substream->bytes); 1322 if (substream->opened) { 1323 runtime = substream->runtime; 1324 snd_iprintf(buffer, 1325 " Mode : %s\n" 1326 " Buffer size : %lu\n" 1327 " Avail : %lu\n", 1328 runtime->oss ? "OSS compatible" : "native", 1329 (unsigned long) runtime->buffer_size, 1330 (unsigned long) runtime->avail); 1331 } 1332 } 1333 } 1334 if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_INPUT) { 1335 list_for_each_entry(substream, 1336 &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams, 1337 list) { 1338 snd_iprintf(buffer, 1339 "Input %d\n" 1340 " Rx bytes : %lu\n", 1341 substream->number, 1342 (unsigned long) substream->bytes); 1343 if (substream->opened) { 1344 runtime = substream->runtime; 1345 snd_iprintf(buffer, 1346 " Buffer size : %lu\n" 1347 " Avail : %lu\n" 1348 " Overruns : %lu\n", 1349 (unsigned long) runtime->buffer_size, 1350 (unsigned long) runtime->avail, 1351 (unsigned long) runtime->xruns); 1352 } 1353 } 1354 } 1355 mutex_unlock(&rmidi->open_mutex); 1356 } 1357 1358 /* 1359 * Register functions 1360 */ 1361 1362 static const struct file_operations snd_rawmidi_f_ops = 1363 { 1364 .owner = THIS_MODULE, 1365 .read = snd_rawmidi_read, 1366 .write = snd_rawmidi_write, 1367 .open = snd_rawmidi_open, 1368 .release = snd_rawmidi_release, 1369 .poll = snd_rawmidi_poll, 1370 .unlocked_ioctl = snd_rawmidi_ioctl, 1371 .compat_ioctl = snd_rawmidi_ioctl_compat, 1372 }; 1373 1374 static int snd_rawmidi_alloc_substreams(struct snd_rawmidi *rmidi, 1375 struct snd_rawmidi_str *stream, 1376 int direction, 1377 int count) 1378 { 1379 struct snd_rawmidi_substream *substream; 1380 int idx; 1381 1382 for (idx = 0; idx < count; idx++) { 1383 substream = kzalloc(sizeof(*substream), GFP_KERNEL); 1384 if (substream == NULL) { 1385 snd_printk(KERN_ERR "rawmidi: cannot allocate substream\n"); 1386 return -ENOMEM; 1387 } 1388 substream->stream = direction; 1389 substream->number = idx; 1390 substream->rmidi = rmidi; 1391 substream->pstr = stream; 1392 list_add_tail(&substream->list, &stream->substreams); 1393 stream->substream_count++; 1394 } 1395 return 0; 1396 } 1397 1398 /** 1399 * snd_rawmidi_new - create a rawmidi instance 1400 * @card: the card instance 1401 * @id: the id string 1402 * @device: the device index 1403 * @output_count: the number of output streams 1404 * @input_count: the number of input streams 1405 * @rrawmidi: the pointer to store the new rawmidi instance 1406 * 1407 * Creates a new rawmidi instance. 1408 * Use snd_rawmidi_set_ops() to set the operators to the new instance. 1409 * 1410 * Returns zero if successful, or a negative error code on failure. 1411 */ 1412 int snd_rawmidi_new(struct snd_card *card, char *id, int device, 1413 int output_count, int input_count, 1414 struct snd_rawmidi ** rrawmidi) 1415 { 1416 struct snd_rawmidi *rmidi; 1417 int err; 1418 static struct snd_device_ops ops = { 1419 .dev_free = snd_rawmidi_dev_free, 1420 .dev_register = snd_rawmidi_dev_register, 1421 .dev_disconnect = snd_rawmidi_dev_disconnect, 1422 }; 1423 1424 snd_assert(rrawmidi != NULL, return -EINVAL); 1425 *rrawmidi = NULL; 1426 snd_assert(card != NULL, return -ENXIO); 1427 rmidi = kzalloc(sizeof(*rmidi), GFP_KERNEL); 1428 if (rmidi == NULL) { 1429 snd_printk(KERN_ERR "rawmidi: cannot allocate\n"); 1430 return -ENOMEM; 1431 } 1432 rmidi->card = card; 1433 rmidi->device = device; 1434 mutex_init(&rmidi->open_mutex); 1435 init_waitqueue_head(&rmidi->open_wait); 1436 INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams); 1437 INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams); 1438 1439 if (id != NULL) 1440 strlcpy(rmidi->id, id, sizeof(rmidi->id)); 1441 if ((err = snd_rawmidi_alloc_substreams(rmidi, 1442 &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT], 1443 SNDRV_RAWMIDI_STREAM_INPUT, 1444 input_count)) < 0) { 1445 snd_rawmidi_free(rmidi); 1446 return err; 1447 } 1448 if ((err = snd_rawmidi_alloc_substreams(rmidi, 1449 &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT], 1450 SNDRV_RAWMIDI_STREAM_OUTPUT, 1451 output_count)) < 0) { 1452 snd_rawmidi_free(rmidi); 1453 return err; 1454 } 1455 if ((err = snd_device_new(card, SNDRV_DEV_RAWMIDI, rmidi, &ops)) < 0) { 1456 snd_rawmidi_free(rmidi); 1457 return err; 1458 } 1459 *rrawmidi = rmidi; 1460 return 0; 1461 } 1462 1463 static void snd_rawmidi_free_substreams(struct snd_rawmidi_str *stream) 1464 { 1465 struct snd_rawmidi_substream *substream; 1466 1467 while (!list_empty(&stream->substreams)) { 1468 substream = list_entry(stream->substreams.next, struct snd_rawmidi_substream, list); 1469 list_del(&substream->list); 1470 kfree(substream); 1471 } 1472 } 1473 1474 static int snd_rawmidi_free(struct snd_rawmidi *rmidi) 1475 { 1476 snd_assert(rmidi != NULL, return -ENXIO); 1477 1478 snd_info_free_entry(rmidi->proc_entry); 1479 rmidi->proc_entry = NULL; 1480 mutex_lock(®ister_mutex); 1481 if (rmidi->ops && rmidi->ops->dev_unregister) 1482 rmidi->ops->dev_unregister(rmidi); 1483 mutex_unlock(®ister_mutex); 1484 1485 snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT]); 1486 snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT]); 1487 if (rmidi->private_free) 1488 rmidi->private_free(rmidi); 1489 kfree(rmidi); 1490 return 0; 1491 } 1492 1493 static int snd_rawmidi_dev_free(struct snd_device *device) 1494 { 1495 struct snd_rawmidi *rmidi = device->device_data; 1496 return snd_rawmidi_free(rmidi); 1497 } 1498 1499 #if defined(CONFIG_SND_SEQUENCER) || (defined(MODULE) && defined(CONFIG_SND_SEQUENCER_MODULE)) 1500 static void snd_rawmidi_dev_seq_free(struct snd_seq_device *device) 1501 { 1502 struct snd_rawmidi *rmidi = device->private_data; 1503 rmidi->seq_dev = NULL; 1504 } 1505 #endif 1506 1507 static int snd_rawmidi_dev_register(struct snd_device *device) 1508 { 1509 int err; 1510 struct snd_info_entry *entry; 1511 char name[16]; 1512 struct snd_rawmidi *rmidi = device->device_data; 1513 1514 if (rmidi->device >= SNDRV_RAWMIDI_DEVICES) 1515 return -ENOMEM; 1516 mutex_lock(®ister_mutex); 1517 if (snd_rawmidi_search(rmidi->card, rmidi->device)) { 1518 mutex_unlock(®ister_mutex); 1519 return -EBUSY; 1520 } 1521 list_add_tail(&rmidi->list, &snd_rawmidi_devices); 1522 sprintf(name, "midiC%iD%i", rmidi->card->number, rmidi->device); 1523 if ((err = snd_register_device(SNDRV_DEVICE_TYPE_RAWMIDI, 1524 rmidi->card, rmidi->device, 1525 &snd_rawmidi_f_ops, rmidi, name)) < 0) { 1526 snd_printk(KERN_ERR "unable to register rawmidi device %i:%i\n", rmidi->card->number, rmidi->device); 1527 list_del(&rmidi->list); 1528 mutex_unlock(®ister_mutex); 1529 return err; 1530 } 1531 if (rmidi->ops && rmidi->ops->dev_register && 1532 (err = rmidi->ops->dev_register(rmidi)) < 0) { 1533 snd_unregister_device(SNDRV_DEVICE_TYPE_RAWMIDI, rmidi->card, rmidi->device); 1534 list_del(&rmidi->list); 1535 mutex_unlock(®ister_mutex); 1536 return err; 1537 } 1538 #ifdef CONFIG_SND_OSSEMUL 1539 rmidi->ossreg = 0; 1540 if ((int)rmidi->device == midi_map[rmidi->card->number]) { 1541 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, 1542 rmidi->card, 0, &snd_rawmidi_f_ops, 1543 rmidi, name) < 0) { 1544 snd_printk(KERN_ERR "unable to register OSS rawmidi device %i:%i\n", rmidi->card->number, 0); 1545 } else { 1546 rmidi->ossreg++; 1547 #ifdef SNDRV_OSS_INFO_DEV_MIDI 1548 snd_oss_info_register(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number, rmidi->name); 1549 #endif 1550 } 1551 } 1552 if ((int)rmidi->device == amidi_map[rmidi->card->number]) { 1553 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, 1554 rmidi->card, 1, &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, 1); 1557 } else { 1558 rmidi->ossreg++; 1559 } 1560 } 1561 #endif /* CONFIG_SND_OSSEMUL */ 1562 mutex_unlock(®ister_mutex); 1563 sprintf(name, "midi%d", rmidi->device); 1564 entry = snd_info_create_card_entry(rmidi->card, name, rmidi->card->proc_root); 1565 if (entry) { 1566 entry->private_data = rmidi; 1567 entry->c.text.read = snd_rawmidi_proc_info_read; 1568 if (snd_info_register(entry) < 0) { 1569 snd_info_free_entry(entry); 1570 entry = NULL; 1571 } 1572 } 1573 rmidi->proc_entry = entry; 1574 #if defined(CONFIG_SND_SEQUENCER) || (defined(MODULE) && defined(CONFIG_SND_SEQUENCER_MODULE)) 1575 if (!rmidi->ops || !rmidi->ops->dev_register) { /* own registration mechanism */ 1576 if (snd_seq_device_new(rmidi->card, rmidi->device, SNDRV_SEQ_DEV_ID_MIDISYNTH, 0, &rmidi->seq_dev) >= 0) { 1577 rmidi->seq_dev->private_data = rmidi; 1578 rmidi->seq_dev->private_free = snd_rawmidi_dev_seq_free; 1579 sprintf(rmidi->seq_dev->name, "MIDI %d-%d", rmidi->card->number, rmidi->device); 1580 snd_device_register(rmidi->card, rmidi->seq_dev); 1581 } 1582 } 1583 #endif 1584 return 0; 1585 } 1586 1587 static int snd_rawmidi_dev_disconnect(struct snd_device *device) 1588 { 1589 struct snd_rawmidi *rmidi = device->device_data; 1590 1591 mutex_lock(®ister_mutex); 1592 list_del_init(&rmidi->list); 1593 #ifdef CONFIG_SND_OSSEMUL 1594 if (rmidi->ossreg) { 1595 if ((int)rmidi->device == midi_map[rmidi->card->number]) { 1596 snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 0); 1597 #ifdef SNDRV_OSS_INFO_DEV_MIDI 1598 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number); 1599 #endif 1600 } 1601 if ((int)rmidi->device == amidi_map[rmidi->card->number]) 1602 snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 1); 1603 rmidi->ossreg = 0; 1604 } 1605 #endif /* CONFIG_SND_OSSEMUL */ 1606 snd_unregister_device(SNDRV_DEVICE_TYPE_RAWMIDI, rmidi->card, rmidi->device); 1607 mutex_unlock(®ister_mutex); 1608 return 0; 1609 } 1610 1611 /** 1612 * snd_rawmidi_set_ops - set the rawmidi operators 1613 * @rmidi: the rawmidi instance 1614 * @stream: the stream direction, SNDRV_RAWMIDI_STREAM_XXX 1615 * @ops: the operator table 1616 * 1617 * Sets the rawmidi operators for the given stream direction. 1618 */ 1619 void snd_rawmidi_set_ops(struct snd_rawmidi *rmidi, int stream, 1620 struct snd_rawmidi_ops *ops) 1621 { 1622 struct snd_rawmidi_substream *substream; 1623 1624 list_for_each_entry(substream, &rmidi->streams[stream].substreams, list) 1625 substream->ops = ops; 1626 } 1627 1628 /* 1629 * ENTRY functions 1630 */ 1631 1632 static int __init alsa_rawmidi_init(void) 1633 { 1634 1635 snd_ctl_register_ioctl(snd_rawmidi_control_ioctl); 1636 snd_ctl_register_ioctl_compat(snd_rawmidi_control_ioctl); 1637 #ifdef CONFIG_SND_OSSEMUL 1638 { int i; 1639 /* check device map table */ 1640 for (i = 0; i < SNDRV_CARDS; i++) { 1641 if (midi_map[i] < 0 || midi_map[i] >= SNDRV_RAWMIDI_DEVICES) { 1642 snd_printk(KERN_ERR "invalid midi_map[%d] = %d\n", i, midi_map[i]); 1643 midi_map[i] = 0; 1644 } 1645 if (amidi_map[i] < 0 || amidi_map[i] >= SNDRV_RAWMIDI_DEVICES) { 1646 snd_printk(KERN_ERR "invalid amidi_map[%d] = %d\n", i, amidi_map[i]); 1647 amidi_map[i] = 1; 1648 } 1649 } 1650 } 1651 #endif /* CONFIG_SND_OSSEMUL */ 1652 return 0; 1653 } 1654 1655 static void __exit alsa_rawmidi_exit(void) 1656 { 1657 snd_ctl_unregister_ioctl(snd_rawmidi_control_ioctl); 1658 snd_ctl_unregister_ioctl_compat(snd_rawmidi_control_ioctl); 1659 } 1660 1661 module_init(alsa_rawmidi_init) 1662 module_exit(alsa_rawmidi_exit) 1663 1664 EXPORT_SYMBOL(snd_rawmidi_output_params); 1665 EXPORT_SYMBOL(snd_rawmidi_input_params); 1666 EXPORT_SYMBOL(snd_rawmidi_drop_output); 1667 EXPORT_SYMBOL(snd_rawmidi_drain_output); 1668 EXPORT_SYMBOL(snd_rawmidi_drain_input); 1669 EXPORT_SYMBOL(snd_rawmidi_receive); 1670 EXPORT_SYMBOL(snd_rawmidi_transmit_empty); 1671 EXPORT_SYMBOL(snd_rawmidi_transmit_peek); 1672 EXPORT_SYMBOL(snd_rawmidi_transmit_ack); 1673 EXPORT_SYMBOL(snd_rawmidi_transmit); 1674 EXPORT_SYMBOL(snd_rawmidi_new); 1675 EXPORT_SYMBOL(snd_rawmidi_set_ops); 1676 EXPORT_SYMBOL(snd_rawmidi_info_select); 1677 EXPORT_SYMBOL(snd_rawmidi_kernel_open); 1678 EXPORT_SYMBOL(snd_rawmidi_kernel_release); 1679 EXPORT_SYMBOL(snd_rawmidi_kernel_read); 1680 EXPORT_SYMBOL(snd_rawmidi_kernel_write); 1681