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 static int snd_rawmidi_dev_unregister(struct snd_device *device); 59 60 static LIST_HEAD(snd_rawmidi_devices); 61 static DEFINE_MUTEX(register_mutex); 62 63 static struct snd_rawmidi *snd_rawmidi_search(struct snd_card *card, int device) 64 { 65 struct list_head *p; 66 struct snd_rawmidi *rawmidi; 67 68 list_for_each(p, &snd_rawmidi_devices) { 69 rawmidi = list_entry(p, struct snd_rawmidi, list); 70 if (rawmidi->card == card && rawmidi->device == device) 71 return rawmidi; 72 } 73 return NULL; 74 } 75 76 static inline unsigned short snd_rawmidi_file_flags(struct file *file) 77 { 78 switch (file->f_mode & (FMODE_READ | FMODE_WRITE)) { 79 case FMODE_WRITE: 80 return SNDRV_RAWMIDI_LFLG_OUTPUT; 81 case FMODE_READ: 82 return SNDRV_RAWMIDI_LFLG_INPUT; 83 default: 84 return SNDRV_RAWMIDI_LFLG_OPEN; 85 } 86 } 87 88 static inline int snd_rawmidi_ready(struct snd_rawmidi_substream *substream) 89 { 90 struct snd_rawmidi_runtime *runtime = substream->runtime; 91 return runtime->avail >= runtime->avail_min; 92 } 93 94 static inline int snd_rawmidi_ready_append(struct snd_rawmidi_substream *substream, 95 size_t count) 96 { 97 struct snd_rawmidi_runtime *runtime = substream->runtime; 98 return runtime->avail >= runtime->avail_min && 99 (!substream->append || runtime->avail >= count); 100 } 101 102 static void snd_rawmidi_input_event_tasklet(unsigned long data) 103 { 104 struct snd_rawmidi_substream *substream = (struct snd_rawmidi_substream *)data; 105 substream->runtime->event(substream); 106 } 107 108 static void snd_rawmidi_output_trigger_tasklet(unsigned long data) 109 { 110 struct snd_rawmidi_substream *substream = (struct snd_rawmidi_substream *)data; 111 substream->ops->trigger(substream, 1); 112 } 113 114 static int snd_rawmidi_runtime_create(struct snd_rawmidi_substream *substream) 115 { 116 struct snd_rawmidi_runtime *runtime; 117 118 if ((runtime = kzalloc(sizeof(*runtime), GFP_KERNEL)) == NULL) 119 return -ENOMEM; 120 spin_lock_init(&runtime->lock); 121 init_waitqueue_head(&runtime->sleep); 122 if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT) 123 tasklet_init(&runtime->tasklet, 124 snd_rawmidi_input_event_tasklet, 125 (unsigned long)substream); 126 else 127 tasklet_init(&runtime->tasklet, 128 snd_rawmidi_output_trigger_tasklet, 129 (unsigned long)substream); 130 runtime->event = NULL; 131 runtime->buffer_size = PAGE_SIZE; 132 runtime->avail_min = 1; 133 if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT) 134 runtime->avail = 0; 135 else 136 runtime->avail = runtime->buffer_size; 137 if ((runtime->buffer = kmalloc(runtime->buffer_size, GFP_KERNEL)) == NULL) { 138 kfree(runtime); 139 return -ENOMEM; 140 } 141 runtime->appl_ptr = runtime->hw_ptr = 0; 142 substream->runtime = runtime; 143 return 0; 144 } 145 146 static int snd_rawmidi_runtime_free(struct snd_rawmidi_substream *substream) 147 { 148 struct snd_rawmidi_runtime *runtime = substream->runtime; 149 150 kfree(runtime->buffer); 151 kfree(runtime); 152 substream->runtime = NULL; 153 return 0; 154 } 155 156 static inline void snd_rawmidi_output_trigger(struct snd_rawmidi_substream *substream,int up) 157 { 158 if (up) { 159 tasklet_hi_schedule(&substream->runtime->tasklet); 160 } else { 161 tasklet_kill(&substream->runtime->tasklet); 162 substream->ops->trigger(substream, 0); 163 } 164 } 165 166 static void snd_rawmidi_input_trigger(struct snd_rawmidi_substream *substream, int up) 167 { 168 substream->ops->trigger(substream, up); 169 if (!up && substream->runtime->event) 170 tasklet_kill(&substream->runtime->tasklet); 171 } 172 173 int snd_rawmidi_drop_output(struct snd_rawmidi_substream *substream) 174 { 175 unsigned long flags; 176 struct snd_rawmidi_runtime *runtime = substream->runtime; 177 178 snd_rawmidi_output_trigger(substream, 0); 179 runtime->drain = 0; 180 spin_lock_irqsave(&runtime->lock, flags); 181 runtime->appl_ptr = runtime->hw_ptr = 0; 182 runtime->avail = runtime->buffer_size; 183 spin_unlock_irqrestore(&runtime->lock, flags); 184 return 0; 185 } 186 187 int snd_rawmidi_drain_output(struct snd_rawmidi_substream *substream) 188 { 189 int err; 190 long timeout; 191 struct snd_rawmidi_runtime *runtime = substream->runtime; 192 193 err = 0; 194 runtime->drain = 1; 195 timeout = wait_event_interruptible_timeout(runtime->sleep, 196 (runtime->avail >= runtime->buffer_size), 197 10*HZ); 198 if (signal_pending(current)) 199 err = -ERESTARTSYS; 200 if (runtime->avail < runtime->buffer_size && !timeout) { 201 snd_printk(KERN_WARNING "rawmidi drain error (avail = %li, buffer_size = %li)\n", (long)runtime->avail, (long)runtime->buffer_size); 202 err = -EIO; 203 } 204 runtime->drain = 0; 205 if (err != -ERESTARTSYS) { 206 /* we need wait a while to make sure that Tx FIFOs are empty */ 207 if (substream->ops->drain) 208 substream->ops->drain(substream); 209 else 210 msleep(50); 211 snd_rawmidi_drop_output(substream); 212 } 213 return err; 214 } 215 216 int snd_rawmidi_drain_input(struct snd_rawmidi_substream *substream) 217 { 218 unsigned long flags; 219 struct snd_rawmidi_runtime *runtime = substream->runtime; 220 221 snd_rawmidi_input_trigger(substream, 0); 222 runtime->drain = 0; 223 spin_lock_irqsave(&runtime->lock, flags); 224 runtime->appl_ptr = runtime->hw_ptr = 0; 225 runtime->avail = 0; 226 spin_unlock_irqrestore(&runtime->lock, flags); 227 return 0; 228 } 229 230 int snd_rawmidi_kernel_open(struct snd_card *card, int device, int subdevice, 231 int mode, struct snd_rawmidi_file * rfile) 232 { 233 struct snd_rawmidi *rmidi; 234 struct list_head *list1, *list2; 235 struct snd_rawmidi_substream *sinput = NULL, *soutput = NULL; 236 struct snd_rawmidi_runtime *input = NULL, *output = NULL; 237 int err; 238 239 if (rfile) 240 rfile->input = rfile->output = NULL; 241 mutex_lock(®ister_mutex); 242 rmidi = snd_rawmidi_search(card, device); 243 mutex_unlock(®ister_mutex); 244 if (rmidi == NULL) { 245 err = -ENODEV; 246 goto __error1; 247 } 248 if (!try_module_get(rmidi->card->module)) { 249 err = -EFAULT; 250 goto __error1; 251 } 252 if (!(mode & SNDRV_RAWMIDI_LFLG_NOOPENLOCK)) 253 mutex_lock(&rmidi->open_mutex); 254 if (mode & SNDRV_RAWMIDI_LFLG_INPUT) { 255 if (!(rmidi->info_flags & SNDRV_RAWMIDI_INFO_INPUT)) { 256 err = -ENXIO; 257 goto __error; 258 } 259 if (subdevice >= 0 && (unsigned int)subdevice >= rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substream_count) { 260 err = -ENODEV; 261 goto __error; 262 } 263 if (rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substream_opened >= 264 rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substream_count) { 265 err = -EAGAIN; 266 goto __error; 267 } 268 } 269 if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) { 270 if (!(rmidi->info_flags & SNDRV_RAWMIDI_INFO_OUTPUT)) { 271 err = -ENXIO; 272 goto __error; 273 } 274 if (subdevice >= 0 && (unsigned int)subdevice >= rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substream_count) { 275 err = -ENODEV; 276 goto __error; 277 } 278 if (rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substream_opened >= 279 rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substream_count) { 280 err = -EAGAIN; 281 goto __error; 282 } 283 } 284 list1 = rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams.next; 285 while (1) { 286 if (list1 == &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams) { 287 sinput = NULL; 288 if (mode & SNDRV_RAWMIDI_LFLG_INPUT) { 289 err = -EAGAIN; 290 goto __error; 291 } 292 break; 293 } 294 sinput = list_entry(list1, struct snd_rawmidi_substream, list); 295 if ((mode & SNDRV_RAWMIDI_LFLG_INPUT) && sinput->opened) 296 goto __nexti; 297 if (subdevice < 0 || (subdevice >= 0 && subdevice == sinput->number)) 298 break; 299 __nexti: 300 list1 = list1->next; 301 } 302 list2 = rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams.next; 303 while (1) { 304 if (list2 == &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams) { 305 soutput = NULL; 306 if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) { 307 err = -EAGAIN; 308 goto __error; 309 } 310 break; 311 } 312 soutput = list_entry(list2, struct snd_rawmidi_substream, list); 313 if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) { 314 if (mode & SNDRV_RAWMIDI_LFLG_APPEND) { 315 if (soutput->opened && !soutput->append) 316 goto __nexto; 317 } else { 318 if (soutput->opened) 319 goto __nexto; 320 } 321 } 322 if (subdevice < 0 || (subdevice >= 0 && subdevice == soutput->number)) 323 break; 324 __nexto: 325 list2 = list2->next; 326 } 327 if (mode & SNDRV_RAWMIDI_LFLG_INPUT) { 328 if ((err = snd_rawmidi_runtime_create(sinput)) < 0) 329 goto __error; 330 input = sinput->runtime; 331 if ((err = sinput->ops->open(sinput)) < 0) 332 goto __error; 333 sinput->opened = 1; 334 rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substream_opened++; 335 } else { 336 sinput = NULL; 337 } 338 if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) { 339 if (soutput->opened) 340 goto __skip_output; 341 if ((err = snd_rawmidi_runtime_create(soutput)) < 0) { 342 if (mode & SNDRV_RAWMIDI_LFLG_INPUT) 343 sinput->ops->close(sinput); 344 goto __error; 345 } 346 output = soutput->runtime; 347 if ((err = soutput->ops->open(soutput)) < 0) { 348 if (mode & SNDRV_RAWMIDI_LFLG_INPUT) 349 sinput->ops->close(sinput); 350 goto __error; 351 } 352 __skip_output: 353 soutput->opened = 1; 354 if (mode & SNDRV_RAWMIDI_LFLG_APPEND) 355 soutput->append = 1; 356 if (soutput->use_count++ == 0) 357 soutput->active_sensing = 1; 358 rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substream_opened++; 359 } else { 360 soutput = NULL; 361 } 362 if (!(mode & SNDRV_RAWMIDI_LFLG_NOOPENLOCK)) 363 mutex_unlock(&rmidi->open_mutex); 364 if (rfile) { 365 rfile->rmidi = rmidi; 366 rfile->input = sinput; 367 rfile->output = soutput; 368 } 369 return 0; 370 371 __error: 372 if (input != NULL) 373 snd_rawmidi_runtime_free(sinput); 374 if (output != NULL) 375 snd_rawmidi_runtime_free(soutput); 376 module_put(rmidi->card->module); 377 if (!(mode & SNDRV_RAWMIDI_LFLG_NOOPENLOCK)) 378 mutex_unlock(&rmidi->open_mutex); 379 __error1: 380 return err; 381 } 382 383 static int snd_rawmidi_open(struct inode *inode, struct file *file) 384 { 385 int maj = imajor(inode); 386 struct snd_card *card; 387 int subdevice; 388 unsigned short fflags; 389 int err; 390 struct snd_rawmidi *rmidi; 391 struct snd_rawmidi_file *rawmidi_file; 392 wait_queue_t wait; 393 struct list_head *list; 394 struct snd_ctl_file *kctl; 395 396 if (maj == snd_major) { 397 rmidi = snd_lookup_minor_data(iminor(inode), 398 SNDRV_DEVICE_TYPE_RAWMIDI); 399 #ifdef CONFIG_SND_OSSEMUL 400 } else if (maj == SOUND_MAJOR) { 401 rmidi = snd_lookup_oss_minor_data(iminor(inode), 402 SNDRV_OSS_DEVICE_TYPE_MIDI); 403 #endif 404 } else 405 return -ENXIO; 406 407 if (rmidi == NULL) 408 return -ENODEV; 409 if ((file->f_flags & O_APPEND) && !(file->f_flags & O_NONBLOCK)) 410 return -EINVAL; /* invalid combination */ 411 card = rmidi->card; 412 err = snd_card_file_add(card, file); 413 if (err < 0) 414 return -ENODEV; 415 fflags = snd_rawmidi_file_flags(file); 416 if ((file->f_flags & O_APPEND) || maj == SOUND_MAJOR) /* OSS emul? */ 417 fflags |= SNDRV_RAWMIDI_LFLG_APPEND; 418 fflags |= SNDRV_RAWMIDI_LFLG_NOOPENLOCK; 419 rawmidi_file = kmalloc(sizeof(*rawmidi_file), GFP_KERNEL); 420 if (rawmidi_file == NULL) { 421 snd_card_file_remove(card, file); 422 return -ENOMEM; 423 } 424 init_waitqueue_entry(&wait, current); 425 add_wait_queue(&rmidi->open_wait, &wait); 426 mutex_lock(&rmidi->open_mutex); 427 while (1) { 428 subdevice = -1; 429 down_read(&card->controls_rwsem); 430 list_for_each(list, &card->ctl_files) { 431 kctl = snd_ctl_file(list); 432 if (kctl->pid == current->pid) { 433 subdevice = kctl->prefer_rawmidi_subdevice; 434 break; 435 } 436 } 437 up_read(&card->controls_rwsem); 438 err = snd_rawmidi_kernel_open(rmidi->card, rmidi->device, 439 subdevice, fflags, rawmidi_file); 440 if (err >= 0) 441 break; 442 if (err == -EAGAIN) { 443 if (file->f_flags & O_NONBLOCK) { 444 err = -EBUSY; 445 break; 446 } 447 } else 448 break; 449 set_current_state(TASK_INTERRUPTIBLE); 450 mutex_unlock(&rmidi->open_mutex); 451 schedule(); 452 mutex_lock(&rmidi->open_mutex); 453 if (signal_pending(current)) { 454 err = -ERESTARTSYS; 455 break; 456 } 457 } 458 #ifdef CONFIG_SND_OSSEMUL 459 if (rawmidi_file->input && rawmidi_file->input->runtime) 460 rawmidi_file->input->runtime->oss = (maj == SOUND_MAJOR); 461 if (rawmidi_file->output && rawmidi_file->output->runtime) 462 rawmidi_file->output->runtime->oss = (maj == SOUND_MAJOR); 463 #endif 464 remove_wait_queue(&rmidi->open_wait, &wait); 465 if (err >= 0) { 466 file->private_data = rawmidi_file; 467 } else { 468 snd_card_file_remove(card, file); 469 kfree(rawmidi_file); 470 } 471 mutex_unlock(&rmidi->open_mutex); 472 return err; 473 } 474 475 int snd_rawmidi_kernel_release(struct snd_rawmidi_file * rfile) 476 { 477 struct snd_rawmidi *rmidi; 478 struct snd_rawmidi_substream *substream; 479 struct snd_rawmidi_runtime *runtime; 480 481 snd_assert(rfile != NULL, return -ENXIO); 482 snd_assert(rfile->input != NULL || rfile->output != NULL, return -ENXIO); 483 rmidi = rfile->rmidi; 484 mutex_lock(&rmidi->open_mutex); 485 if (rfile->input != NULL) { 486 substream = rfile->input; 487 rfile->input = NULL; 488 runtime = substream->runtime; 489 snd_rawmidi_input_trigger(substream, 0); 490 substream->ops->close(substream); 491 if (runtime->private_free != NULL) 492 runtime->private_free(substream); 493 snd_rawmidi_runtime_free(substream); 494 substream->opened = 0; 495 rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substream_opened--; 496 } 497 if (rfile->output != NULL) { 498 substream = rfile->output; 499 rfile->output = NULL; 500 if (--substream->use_count == 0) { 501 runtime = substream->runtime; 502 if (substream->active_sensing) { 503 unsigned char buf = 0xfe; 504 /* sending single active sensing message to shut the device up */ 505 snd_rawmidi_kernel_write(substream, &buf, 1); 506 } 507 if (snd_rawmidi_drain_output(substream) == -ERESTARTSYS) 508 snd_rawmidi_output_trigger(substream, 0); 509 substream->ops->close(substream); 510 if (runtime->private_free != NULL) 511 runtime->private_free(substream); 512 snd_rawmidi_runtime_free(substream); 513 substream->opened = 0; 514 substream->append = 0; 515 } 516 rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substream_opened--; 517 } 518 mutex_unlock(&rmidi->open_mutex); 519 module_put(rmidi->card->module); 520 return 0; 521 } 522 523 static int snd_rawmidi_release(struct inode *inode, struct file *file) 524 { 525 struct snd_rawmidi_file *rfile; 526 struct snd_rawmidi *rmidi; 527 int err; 528 529 rfile = file->private_data; 530 err = snd_rawmidi_kernel_release(rfile); 531 rmidi = rfile->rmidi; 532 wake_up(&rmidi->open_wait); 533 kfree(rfile); 534 snd_card_file_remove(rmidi->card, file); 535 return err; 536 } 537 538 static int snd_rawmidi_info(struct snd_rawmidi_substream *substream, 539 struct snd_rawmidi_info *info) 540 { 541 struct snd_rawmidi *rmidi; 542 543 if (substream == NULL) 544 return -ENODEV; 545 rmidi = substream->rmidi; 546 memset(info, 0, sizeof(*info)); 547 info->card = rmidi->card->number; 548 info->device = rmidi->device; 549 info->subdevice = substream->number; 550 info->stream = substream->stream; 551 info->flags = rmidi->info_flags; 552 strcpy(info->id, rmidi->id); 553 strcpy(info->name, rmidi->name); 554 strcpy(info->subname, substream->name); 555 info->subdevices_count = substream->pstr->substream_count; 556 info->subdevices_avail = (substream->pstr->substream_count - 557 substream->pstr->substream_opened); 558 return 0; 559 } 560 561 static int snd_rawmidi_info_user(struct snd_rawmidi_substream *substream, 562 struct snd_rawmidi_info __user * _info) 563 { 564 struct snd_rawmidi_info info; 565 int err; 566 if ((err = snd_rawmidi_info(substream, &info)) < 0) 567 return err; 568 if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info))) 569 return -EFAULT; 570 return 0; 571 } 572 573 int snd_rawmidi_info_select(struct snd_card *card, struct snd_rawmidi_info *info) 574 { 575 struct snd_rawmidi *rmidi; 576 struct snd_rawmidi_str *pstr; 577 struct snd_rawmidi_substream *substream; 578 struct list_head *list; 579 580 mutex_lock(®ister_mutex); 581 rmidi = snd_rawmidi_search(card, info->device); 582 mutex_unlock(®ister_mutex); 583 if (!rmidi) 584 return -ENXIO; 585 if (info->stream < 0 || info->stream > 1) 586 return -EINVAL; 587 pstr = &rmidi->streams[info->stream]; 588 if (pstr->substream_count == 0) 589 return -ENOENT; 590 if (info->subdevice >= pstr->substream_count) 591 return -ENXIO; 592 list_for_each(list, &pstr->substreams) { 593 substream = list_entry(list, struct snd_rawmidi_substream, list); 594 if ((unsigned int)substream->number == info->subdevice) 595 return snd_rawmidi_info(substream, info); 596 } 597 return -ENXIO; 598 } 599 600 static int snd_rawmidi_info_select_user(struct snd_card *card, 601 struct snd_rawmidi_info __user *_info) 602 { 603 int err; 604 struct snd_rawmidi_info info; 605 if (get_user(info.device, &_info->device)) 606 return -EFAULT; 607 if (get_user(info.stream, &_info->stream)) 608 return -EFAULT; 609 if (get_user(info.subdevice, &_info->subdevice)) 610 return -EFAULT; 611 if ((err = snd_rawmidi_info_select(card, &info)) < 0) 612 return err; 613 if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info))) 614 return -EFAULT; 615 return 0; 616 } 617 618 int snd_rawmidi_output_params(struct snd_rawmidi_substream *substream, 619 struct snd_rawmidi_params * params) 620 { 621 char *newbuf; 622 struct snd_rawmidi_runtime *runtime = substream->runtime; 623 624 if (substream->append && substream->use_count > 1) 625 return -EBUSY; 626 snd_rawmidi_drain_output(substream); 627 if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L) { 628 return -EINVAL; 629 } 630 if (params->avail_min < 1 || params->avail_min > params->buffer_size) { 631 return -EINVAL; 632 } 633 if (params->buffer_size != runtime->buffer_size) { 634 newbuf = kmalloc(params->buffer_size, GFP_KERNEL); 635 if (!newbuf) 636 return -ENOMEM; 637 kfree(runtime->buffer); 638 runtime->buffer = newbuf; 639 runtime->buffer_size = params->buffer_size; 640 runtime->avail = runtime->buffer_size; 641 } 642 runtime->avail_min = params->avail_min; 643 substream->active_sensing = !params->no_active_sensing; 644 return 0; 645 } 646 647 int snd_rawmidi_input_params(struct snd_rawmidi_substream *substream, 648 struct snd_rawmidi_params * params) 649 { 650 char *newbuf; 651 struct snd_rawmidi_runtime *runtime = substream->runtime; 652 653 snd_rawmidi_drain_input(substream); 654 if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L) { 655 return -EINVAL; 656 } 657 if (params->avail_min < 1 || params->avail_min > params->buffer_size) { 658 return -EINVAL; 659 } 660 if (params->buffer_size != runtime->buffer_size) { 661 newbuf = kmalloc(params->buffer_size, GFP_KERNEL); 662 if (!newbuf) 663 return -ENOMEM; 664 kfree(runtime->buffer); 665 runtime->buffer = newbuf; 666 runtime->buffer_size = params->buffer_size; 667 } 668 runtime->avail_min = params->avail_min; 669 return 0; 670 } 671 672 static int snd_rawmidi_output_status(struct snd_rawmidi_substream *substream, 673 struct snd_rawmidi_status * status) 674 { 675 struct snd_rawmidi_runtime *runtime = substream->runtime; 676 677 memset(status, 0, sizeof(*status)); 678 status->stream = SNDRV_RAWMIDI_STREAM_OUTPUT; 679 spin_lock_irq(&runtime->lock); 680 status->avail = runtime->avail; 681 spin_unlock_irq(&runtime->lock); 682 return 0; 683 } 684 685 static int snd_rawmidi_input_status(struct snd_rawmidi_substream *substream, 686 struct snd_rawmidi_status * status) 687 { 688 struct snd_rawmidi_runtime *runtime = substream->runtime; 689 690 memset(status, 0, sizeof(*status)); 691 status->stream = SNDRV_RAWMIDI_STREAM_INPUT; 692 spin_lock_irq(&runtime->lock); 693 status->avail = runtime->avail; 694 status->xruns = runtime->xruns; 695 runtime->xruns = 0; 696 spin_unlock_irq(&runtime->lock); 697 return 0; 698 } 699 700 static long snd_rawmidi_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 701 { 702 struct snd_rawmidi_file *rfile; 703 void __user *argp = (void __user *)arg; 704 705 rfile = file->private_data; 706 if (((cmd >> 8) & 0xff) != 'W') 707 return -ENOTTY; 708 switch (cmd) { 709 case SNDRV_RAWMIDI_IOCTL_PVERSION: 710 return put_user(SNDRV_RAWMIDI_VERSION, (int __user *)argp) ? -EFAULT : 0; 711 case SNDRV_RAWMIDI_IOCTL_INFO: 712 { 713 int stream; 714 struct snd_rawmidi_info __user *info = argp; 715 if (get_user(stream, &info->stream)) 716 return -EFAULT; 717 switch (stream) { 718 case SNDRV_RAWMIDI_STREAM_INPUT: 719 return snd_rawmidi_info_user(rfile->input, info); 720 case SNDRV_RAWMIDI_STREAM_OUTPUT: 721 return snd_rawmidi_info_user(rfile->output, info); 722 default: 723 return -EINVAL; 724 } 725 } 726 case SNDRV_RAWMIDI_IOCTL_PARAMS: 727 { 728 struct snd_rawmidi_params params; 729 if (copy_from_user(¶ms, argp, sizeof(struct snd_rawmidi_params))) 730 return -EFAULT; 731 switch (params.stream) { 732 case SNDRV_RAWMIDI_STREAM_OUTPUT: 733 if (rfile->output == NULL) 734 return -EINVAL; 735 return snd_rawmidi_output_params(rfile->output, ¶ms); 736 case SNDRV_RAWMIDI_STREAM_INPUT: 737 if (rfile->input == NULL) 738 return -EINVAL; 739 return snd_rawmidi_input_params(rfile->input, ¶ms); 740 default: 741 return -EINVAL; 742 } 743 } 744 case SNDRV_RAWMIDI_IOCTL_STATUS: 745 { 746 int err = 0; 747 struct snd_rawmidi_status status; 748 if (copy_from_user(&status, argp, sizeof(struct snd_rawmidi_status))) 749 return -EFAULT; 750 switch (status.stream) { 751 case SNDRV_RAWMIDI_STREAM_OUTPUT: 752 if (rfile->output == NULL) 753 return -EINVAL; 754 err = snd_rawmidi_output_status(rfile->output, &status); 755 break; 756 case SNDRV_RAWMIDI_STREAM_INPUT: 757 if (rfile->input == NULL) 758 return -EINVAL; 759 err = snd_rawmidi_input_status(rfile->input, &status); 760 break; 761 default: 762 return -EINVAL; 763 } 764 if (err < 0) 765 return err; 766 if (copy_to_user(argp, &status, sizeof(struct snd_rawmidi_status))) 767 return -EFAULT; 768 return 0; 769 } 770 case SNDRV_RAWMIDI_IOCTL_DROP: 771 { 772 int val; 773 if (get_user(val, (int __user *) argp)) 774 return -EFAULT; 775 switch (val) { 776 case SNDRV_RAWMIDI_STREAM_OUTPUT: 777 if (rfile->output == NULL) 778 return -EINVAL; 779 return snd_rawmidi_drop_output(rfile->output); 780 default: 781 return -EINVAL; 782 } 783 } 784 case SNDRV_RAWMIDI_IOCTL_DRAIN: 785 { 786 int val; 787 if (get_user(val, (int __user *) argp)) 788 return -EFAULT; 789 switch (val) { 790 case SNDRV_RAWMIDI_STREAM_OUTPUT: 791 if (rfile->output == NULL) 792 return -EINVAL; 793 return snd_rawmidi_drain_output(rfile->output); 794 case SNDRV_RAWMIDI_STREAM_INPUT: 795 if (rfile->input == NULL) 796 return -EINVAL; 797 return snd_rawmidi_drain_input(rfile->input); 798 default: 799 return -EINVAL; 800 } 801 } 802 #ifdef CONFIG_SND_DEBUG 803 default: 804 snd_printk(KERN_WARNING "rawmidi: unknown command = 0x%x\n", cmd); 805 #endif 806 } 807 return -ENOTTY; 808 } 809 810 static int snd_rawmidi_control_ioctl(struct snd_card *card, 811 struct snd_ctl_file *control, 812 unsigned int cmd, 813 unsigned long arg) 814 { 815 void __user *argp = (void __user *)arg; 816 817 switch (cmd) { 818 case SNDRV_CTL_IOCTL_RAWMIDI_NEXT_DEVICE: 819 { 820 int device; 821 822 if (get_user(device, (int __user *)argp)) 823 return -EFAULT; 824 mutex_lock(®ister_mutex); 825 device = device < 0 ? 0 : device + 1; 826 while (device < SNDRV_RAWMIDI_DEVICES) { 827 if (snd_rawmidi_search(card, device)) 828 break; 829 device++; 830 } 831 if (device == SNDRV_RAWMIDI_DEVICES) 832 device = -1; 833 mutex_unlock(®ister_mutex); 834 if (put_user(device, (int __user *)argp)) 835 return -EFAULT; 836 return 0; 837 } 838 case SNDRV_CTL_IOCTL_RAWMIDI_PREFER_SUBDEVICE: 839 { 840 int val; 841 842 if (get_user(val, (int __user *)argp)) 843 return -EFAULT; 844 control->prefer_rawmidi_subdevice = val; 845 return 0; 846 } 847 case SNDRV_CTL_IOCTL_RAWMIDI_INFO: 848 return snd_rawmidi_info_select_user(card, argp); 849 } 850 return -ENOIOCTLCMD; 851 } 852 853 /** 854 * snd_rawmidi_receive - receive the input data from the device 855 * @substream: the rawmidi substream 856 * @buffer: the buffer pointer 857 * @count: the data size to read 858 * 859 * Reads the data from the internal buffer. 860 * 861 * Returns the size of read data, or a negative error code on failure. 862 */ 863 int snd_rawmidi_receive(struct snd_rawmidi_substream *substream, 864 const unsigned char *buffer, int count) 865 { 866 unsigned long flags; 867 int result = 0, count1; 868 struct snd_rawmidi_runtime *runtime = substream->runtime; 869 870 if (runtime->buffer == NULL) { 871 snd_printd("snd_rawmidi_receive: input is not active!!!\n"); 872 return -EINVAL; 873 } 874 spin_lock_irqsave(&runtime->lock, flags); 875 if (count == 1) { /* special case, faster code */ 876 substream->bytes++; 877 if (runtime->avail < runtime->buffer_size) { 878 runtime->buffer[runtime->hw_ptr++] = buffer[0]; 879 runtime->hw_ptr %= runtime->buffer_size; 880 runtime->avail++; 881 result++; 882 } else { 883 runtime->xruns++; 884 } 885 } else { 886 substream->bytes += count; 887 count1 = runtime->buffer_size - runtime->hw_ptr; 888 if (count1 > count) 889 count1 = count; 890 if (count1 > (int)(runtime->buffer_size - runtime->avail)) 891 count1 = runtime->buffer_size - runtime->avail; 892 memcpy(runtime->buffer + runtime->hw_ptr, buffer, count1); 893 runtime->hw_ptr += count1; 894 runtime->hw_ptr %= runtime->buffer_size; 895 runtime->avail += count1; 896 count -= count1; 897 result += count1; 898 if (count > 0) { 899 buffer += count1; 900 count1 = count; 901 if (count1 > (int)(runtime->buffer_size - runtime->avail)) { 902 count1 = runtime->buffer_size - runtime->avail; 903 runtime->xruns += count - count1; 904 } 905 if (count1 > 0) { 906 memcpy(runtime->buffer, buffer, count1); 907 runtime->hw_ptr = count1; 908 runtime->avail += count1; 909 result += count1; 910 } 911 } 912 } 913 if (result > 0) { 914 if (runtime->event) 915 tasklet_hi_schedule(&runtime->tasklet); 916 else if (snd_rawmidi_ready(substream)) 917 wake_up(&runtime->sleep); 918 } 919 spin_unlock_irqrestore(&runtime->lock, flags); 920 return result; 921 } 922 923 static long snd_rawmidi_kernel_read1(struct snd_rawmidi_substream *substream, 924 unsigned char *buf, long count, int kernel) 925 { 926 unsigned long flags; 927 long result = 0, count1; 928 struct snd_rawmidi_runtime *runtime = substream->runtime; 929 930 while (count > 0 && runtime->avail) { 931 count1 = runtime->buffer_size - runtime->appl_ptr; 932 if (count1 > count) 933 count1 = count; 934 spin_lock_irqsave(&runtime->lock, flags); 935 if (count1 > (int)runtime->avail) 936 count1 = runtime->avail; 937 if (kernel) { 938 memcpy(buf + result, runtime->buffer + runtime->appl_ptr, count1); 939 } else { 940 spin_unlock_irqrestore(&runtime->lock, flags); 941 if (copy_to_user((char __user *)buf + result, 942 runtime->buffer + runtime->appl_ptr, count1)) { 943 return result > 0 ? result : -EFAULT; 944 } 945 spin_lock_irqsave(&runtime->lock, flags); 946 } 947 runtime->appl_ptr += count1; 948 runtime->appl_ptr %= runtime->buffer_size; 949 runtime->avail -= count1; 950 spin_unlock_irqrestore(&runtime->lock, flags); 951 result += count1; 952 count -= count1; 953 } 954 return result; 955 } 956 957 long snd_rawmidi_kernel_read(struct snd_rawmidi_substream *substream, 958 unsigned char *buf, long count) 959 { 960 snd_rawmidi_input_trigger(substream, 1); 961 return snd_rawmidi_kernel_read1(substream, buf, count, 1); 962 } 963 964 static ssize_t snd_rawmidi_read(struct file *file, char __user *buf, size_t count, 965 loff_t *offset) 966 { 967 long result; 968 int count1; 969 struct snd_rawmidi_file *rfile; 970 struct snd_rawmidi_substream *substream; 971 struct snd_rawmidi_runtime *runtime; 972 973 rfile = file->private_data; 974 substream = rfile->input; 975 if (substream == NULL) 976 return -EIO; 977 runtime = substream->runtime; 978 snd_rawmidi_input_trigger(substream, 1); 979 result = 0; 980 while (count > 0) { 981 spin_lock_irq(&runtime->lock); 982 while (!snd_rawmidi_ready(substream)) { 983 wait_queue_t wait; 984 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) { 985 spin_unlock_irq(&runtime->lock); 986 return result > 0 ? result : -EAGAIN; 987 } 988 init_waitqueue_entry(&wait, current); 989 add_wait_queue(&runtime->sleep, &wait); 990 set_current_state(TASK_INTERRUPTIBLE); 991 spin_unlock_irq(&runtime->lock); 992 schedule(); 993 remove_wait_queue(&runtime->sleep, &wait); 994 if (signal_pending(current)) 995 return result > 0 ? result : -ERESTARTSYS; 996 if (!runtime->avail) 997 return result > 0 ? result : -EIO; 998 spin_lock_irq(&runtime->lock); 999 } 1000 spin_unlock_irq(&runtime->lock); 1001 count1 = snd_rawmidi_kernel_read1(substream, 1002 (unsigned char __force *)buf, 1003 count, 0); 1004 if (count1 < 0) 1005 return result > 0 ? result : count1; 1006 result += count1; 1007 buf += count1; 1008 count -= count1; 1009 } 1010 return result; 1011 } 1012 1013 /** 1014 * snd_rawmidi_transmit_empty - check whether the output buffer is empty 1015 * @substream: the rawmidi substream 1016 * 1017 * Returns 1 if the internal output buffer is empty, 0 if not. 1018 */ 1019 int snd_rawmidi_transmit_empty(struct snd_rawmidi_substream *substream) 1020 { 1021 struct snd_rawmidi_runtime *runtime = substream->runtime; 1022 int result; 1023 unsigned long flags; 1024 1025 if (runtime->buffer == NULL) { 1026 snd_printd("snd_rawmidi_transmit_empty: output is not active!!!\n"); 1027 return 1; 1028 } 1029 spin_lock_irqsave(&runtime->lock, flags); 1030 result = runtime->avail >= runtime->buffer_size; 1031 spin_unlock_irqrestore(&runtime->lock, flags); 1032 return result; 1033 } 1034 1035 /** 1036 * snd_rawmidi_transmit_peek - copy data from the internal buffer 1037 * @substream: the rawmidi substream 1038 * @buffer: the buffer pointer 1039 * @count: data size to transfer 1040 * 1041 * Copies data from the internal output buffer to the given buffer. 1042 * 1043 * Call this in the interrupt handler when the midi output is ready, 1044 * and call snd_rawmidi_transmit_ack() after the transmission is 1045 * finished. 1046 * 1047 * Returns the size of copied data, or a negative error code on failure. 1048 */ 1049 int snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream, 1050 unsigned char *buffer, int count) 1051 { 1052 unsigned long flags; 1053 int result, count1; 1054 struct snd_rawmidi_runtime *runtime = substream->runtime; 1055 1056 if (runtime->buffer == NULL) { 1057 snd_printd("snd_rawmidi_transmit_peek: output is not active!!!\n"); 1058 return -EINVAL; 1059 } 1060 result = 0; 1061 spin_lock_irqsave(&runtime->lock, flags); 1062 if (runtime->avail >= runtime->buffer_size) { 1063 /* warning: lowlevel layer MUST trigger down the hardware */ 1064 goto __skip; 1065 } 1066 if (count == 1) { /* special case, faster code */ 1067 *buffer = runtime->buffer[runtime->hw_ptr]; 1068 result++; 1069 } else { 1070 count1 = runtime->buffer_size - runtime->hw_ptr; 1071 if (count1 > count) 1072 count1 = count; 1073 if (count1 > (int)(runtime->buffer_size - runtime->avail)) 1074 count1 = runtime->buffer_size - runtime->avail; 1075 memcpy(buffer, runtime->buffer + runtime->hw_ptr, count1); 1076 count -= count1; 1077 result += count1; 1078 if (count > 0) { 1079 if (count > (int)(runtime->buffer_size - runtime->avail - count1)) 1080 count = runtime->buffer_size - runtime->avail - count1; 1081 memcpy(buffer + count1, runtime->buffer, count); 1082 result += count; 1083 } 1084 } 1085 __skip: 1086 spin_unlock_irqrestore(&runtime->lock, flags); 1087 return result; 1088 } 1089 1090 /** 1091 * snd_rawmidi_transmit_ack - acknowledge the transmission 1092 * @substream: the rawmidi substream 1093 * @count: the tranferred count 1094 * 1095 * Advances the hardware pointer for the internal output buffer with 1096 * the given size and updates the condition. 1097 * Call after the transmission is finished. 1098 * 1099 * Returns the advanced size if successful, or a negative error code on failure. 1100 */ 1101 int snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count) 1102 { 1103 unsigned long flags; 1104 struct snd_rawmidi_runtime *runtime = substream->runtime; 1105 1106 if (runtime->buffer == NULL) { 1107 snd_printd("snd_rawmidi_transmit_ack: output is not active!!!\n"); 1108 return -EINVAL; 1109 } 1110 spin_lock_irqsave(&runtime->lock, flags); 1111 snd_assert(runtime->avail + count <= runtime->buffer_size, ); 1112 runtime->hw_ptr += count; 1113 runtime->hw_ptr %= runtime->buffer_size; 1114 runtime->avail += count; 1115 substream->bytes += count; 1116 if (count > 0) { 1117 if (runtime->drain || snd_rawmidi_ready(substream)) 1118 wake_up(&runtime->sleep); 1119 } 1120 spin_unlock_irqrestore(&runtime->lock, flags); 1121 return count; 1122 } 1123 1124 /** 1125 * snd_rawmidi_transmit - copy from the buffer to the device 1126 * @substream: the rawmidi substream 1127 * @buffer: the buffer pointer 1128 * @count: the data size to transfer 1129 * 1130 * Copies data from the buffer to the device and advances the pointer. 1131 * 1132 * Returns the copied size if successful, or a negative error code on failure. 1133 */ 1134 int snd_rawmidi_transmit(struct snd_rawmidi_substream *substream, 1135 unsigned char *buffer, int count) 1136 { 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 *buf, long count, int kernel) 1145 { 1146 unsigned long flags; 1147 long count1, result; 1148 struct snd_rawmidi_runtime *runtime = substream->runtime; 1149 1150 snd_assert(buf != NULL, return -EINVAL); 1151 snd_assert(runtime->buffer != NULL, return -EINVAL); 1152 1153 result = 0; 1154 spin_lock_irqsave(&runtime->lock, flags); 1155 if (substream->append) { 1156 if ((long)runtime->avail < count) { 1157 spin_unlock_irqrestore(&runtime->lock, flags); 1158 return -EAGAIN; 1159 } 1160 } 1161 while (count > 0 && runtime->avail > 0) { 1162 count1 = runtime->buffer_size - runtime->appl_ptr; 1163 if (count1 > count) 1164 count1 = count; 1165 if (count1 > (long)runtime->avail) 1166 count1 = runtime->avail; 1167 if (kernel) { 1168 memcpy(runtime->buffer + runtime->appl_ptr, buf, count1); 1169 } else { 1170 spin_unlock_irqrestore(&runtime->lock, flags); 1171 if (copy_from_user(runtime->buffer + runtime->appl_ptr, 1172 (char __user *)buf, count1)) { 1173 spin_lock_irqsave(&runtime->lock, flags); 1174 result = result > 0 ? result : -EFAULT; 1175 goto __end; 1176 } 1177 spin_lock_irqsave(&runtime->lock, flags); 1178 } 1179 runtime->appl_ptr += count1; 1180 runtime->appl_ptr %= runtime->buffer_size; 1181 runtime->avail -= count1; 1182 result += count1; 1183 buf += count1; 1184 count -= count1; 1185 } 1186 __end: 1187 count1 = runtime->avail < runtime->buffer_size; 1188 spin_unlock_irqrestore(&runtime->lock, flags); 1189 if (count1) 1190 snd_rawmidi_output_trigger(substream, 1); 1191 return result; 1192 } 1193 1194 long snd_rawmidi_kernel_write(struct snd_rawmidi_substream *substream, 1195 const unsigned char *buf, long count) 1196 { 1197 return snd_rawmidi_kernel_write1(substream, buf, count, 1); 1198 } 1199 1200 static ssize_t snd_rawmidi_write(struct file *file, const char __user *buf, 1201 size_t count, loff_t *offset) 1202 { 1203 long result, timeout; 1204 int count1; 1205 struct snd_rawmidi_file *rfile; 1206 struct snd_rawmidi_runtime *runtime; 1207 struct snd_rawmidi_substream *substream; 1208 1209 rfile = file->private_data; 1210 substream = rfile->output; 1211 runtime = substream->runtime; 1212 /* we cannot put an atomic message to our buffer */ 1213 if (substream->append && count > runtime->buffer_size) 1214 return -EIO; 1215 result = 0; 1216 while (count > 0) { 1217 spin_lock_irq(&runtime->lock); 1218 while (!snd_rawmidi_ready_append(substream, count)) { 1219 wait_queue_t wait; 1220 if (file->f_flags & O_NONBLOCK) { 1221 spin_unlock_irq(&runtime->lock); 1222 return result > 0 ? result : -EAGAIN; 1223 } 1224 init_waitqueue_entry(&wait, current); 1225 add_wait_queue(&runtime->sleep, &wait); 1226 set_current_state(TASK_INTERRUPTIBLE); 1227 spin_unlock_irq(&runtime->lock); 1228 timeout = schedule_timeout(30 * HZ); 1229 remove_wait_queue(&runtime->sleep, &wait); 1230 if (signal_pending(current)) 1231 return result > 0 ? result : -ERESTARTSYS; 1232 if (!runtime->avail && !timeout) 1233 return result > 0 ? result : -EIO; 1234 spin_lock_irq(&runtime->lock); 1235 } 1236 spin_unlock_irq(&runtime->lock); 1237 count1 = snd_rawmidi_kernel_write1(substream, 1238 (unsigned char __force *)buf, 1239 count, 0); 1240 if (count1 < 0) 1241 return result > 0 ? result : count1; 1242 result += count1; 1243 buf += count1; 1244 if ((size_t)count1 < count && (file->f_flags & O_NONBLOCK)) 1245 break; 1246 count -= count1; 1247 } 1248 if (file->f_flags & O_SYNC) { 1249 spin_lock_irq(&runtime->lock); 1250 while (runtime->avail != runtime->buffer_size) { 1251 wait_queue_t wait; 1252 unsigned int last_avail = runtime->avail; 1253 init_waitqueue_entry(&wait, current); 1254 add_wait_queue(&runtime->sleep, &wait); 1255 set_current_state(TASK_INTERRUPTIBLE); 1256 spin_unlock_irq(&runtime->lock); 1257 timeout = schedule_timeout(30 * HZ); 1258 remove_wait_queue(&runtime->sleep, &wait); 1259 if (signal_pending(current)) 1260 return result > 0 ? result : -ERESTARTSYS; 1261 if (runtime->avail == last_avail && !timeout) 1262 return result > 0 ? result : -EIO; 1263 spin_lock_irq(&runtime->lock); 1264 } 1265 spin_unlock_irq(&runtime->lock); 1266 } 1267 return result; 1268 } 1269 1270 static unsigned int snd_rawmidi_poll(struct file *file, poll_table * wait) 1271 { 1272 struct snd_rawmidi_file *rfile; 1273 struct snd_rawmidi_runtime *runtime; 1274 unsigned int mask; 1275 1276 rfile = file->private_data; 1277 if (rfile->input != NULL) { 1278 runtime = rfile->input->runtime; 1279 snd_rawmidi_input_trigger(rfile->input, 1); 1280 poll_wait(file, &runtime->sleep, wait); 1281 } 1282 if (rfile->output != NULL) { 1283 runtime = rfile->output->runtime; 1284 poll_wait(file, &runtime->sleep, wait); 1285 } 1286 mask = 0; 1287 if (rfile->input != NULL) { 1288 if (snd_rawmidi_ready(rfile->input)) 1289 mask |= POLLIN | POLLRDNORM; 1290 } 1291 if (rfile->output != NULL) { 1292 if (snd_rawmidi_ready(rfile->output)) 1293 mask |= POLLOUT | POLLWRNORM; 1294 } 1295 return mask; 1296 } 1297 1298 /* 1299 */ 1300 #ifdef CONFIG_COMPAT 1301 #include "rawmidi_compat.c" 1302 #else 1303 #define snd_rawmidi_ioctl_compat NULL 1304 #endif 1305 1306 /* 1307 1308 */ 1309 1310 static void snd_rawmidi_proc_info_read(struct snd_info_entry *entry, 1311 struct snd_info_buffer *buffer) 1312 { 1313 struct snd_rawmidi *rmidi; 1314 struct snd_rawmidi_substream *substream; 1315 struct snd_rawmidi_runtime *runtime; 1316 struct list_head *list; 1317 1318 rmidi = entry->private_data; 1319 snd_iprintf(buffer, "%s\n\n", rmidi->name); 1320 mutex_lock(&rmidi->open_mutex); 1321 if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_OUTPUT) { 1322 list_for_each(list, &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams) { 1323 substream = list_entry(list, struct snd_rawmidi_substream, list); 1324 snd_iprintf(buffer, 1325 "Output %d\n" 1326 " Tx bytes : %lu\n", 1327 substream->number, 1328 (unsigned long) substream->bytes); 1329 if (substream->opened) { 1330 runtime = substream->runtime; 1331 snd_iprintf(buffer, 1332 " Mode : %s\n" 1333 " Buffer size : %lu\n" 1334 " Avail : %lu\n", 1335 runtime->oss ? "OSS compatible" : "native", 1336 (unsigned long) runtime->buffer_size, 1337 (unsigned long) runtime->avail); 1338 } 1339 } 1340 } 1341 if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_INPUT) { 1342 list_for_each(list, &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams) { 1343 substream = list_entry(list, struct snd_rawmidi_substream, list); 1344 snd_iprintf(buffer, 1345 "Input %d\n" 1346 " Rx bytes : %lu\n", 1347 substream->number, 1348 (unsigned long) substream->bytes); 1349 if (substream->opened) { 1350 runtime = substream->runtime; 1351 snd_iprintf(buffer, 1352 " Buffer size : %lu\n" 1353 " Avail : %lu\n" 1354 " Overruns : %lu\n", 1355 (unsigned long) runtime->buffer_size, 1356 (unsigned long) runtime->avail, 1357 (unsigned long) runtime->xruns); 1358 } 1359 } 1360 } 1361 mutex_unlock(&rmidi->open_mutex); 1362 } 1363 1364 /* 1365 * Register functions 1366 */ 1367 1368 static struct file_operations snd_rawmidi_f_ops = 1369 { 1370 .owner = THIS_MODULE, 1371 .read = snd_rawmidi_read, 1372 .write = snd_rawmidi_write, 1373 .open = snd_rawmidi_open, 1374 .release = snd_rawmidi_release, 1375 .poll = snd_rawmidi_poll, 1376 .unlocked_ioctl = snd_rawmidi_ioctl, 1377 .compat_ioctl = snd_rawmidi_ioctl_compat, 1378 }; 1379 1380 static int snd_rawmidi_alloc_substreams(struct snd_rawmidi *rmidi, 1381 struct snd_rawmidi_str *stream, 1382 int direction, 1383 int count) 1384 { 1385 struct snd_rawmidi_substream *substream; 1386 int idx; 1387 1388 INIT_LIST_HEAD(&stream->substreams); 1389 for (idx = 0; idx < count; idx++) { 1390 substream = kzalloc(sizeof(*substream), GFP_KERNEL); 1391 if (substream == NULL) { 1392 snd_printk(KERN_ERR "rawmidi: cannot allocate substream\n"); 1393 return -ENOMEM; 1394 } 1395 substream->stream = direction; 1396 substream->number = idx; 1397 substream->rmidi = rmidi; 1398 substream->pstr = stream; 1399 list_add_tail(&substream->list, &stream->substreams); 1400 stream->substream_count++; 1401 } 1402 return 0; 1403 } 1404 1405 /** 1406 * snd_rawmidi_new - create a rawmidi instance 1407 * @card: the card instance 1408 * @id: the id string 1409 * @device: the device index 1410 * @output_count: the number of output streams 1411 * @input_count: the number of input streams 1412 * @rrawmidi: the pointer to store the new rawmidi instance 1413 * 1414 * Creates a new rawmidi instance. 1415 * Use snd_rawmidi_set_ops() to set the operators to the new instance. 1416 * 1417 * Returns zero if successful, or a negative error code on failure. 1418 */ 1419 int snd_rawmidi_new(struct snd_card *card, char *id, int device, 1420 int output_count, int input_count, 1421 struct snd_rawmidi ** rrawmidi) 1422 { 1423 struct snd_rawmidi *rmidi; 1424 int err; 1425 static struct snd_device_ops ops = { 1426 .dev_free = snd_rawmidi_dev_free, 1427 .dev_register = snd_rawmidi_dev_register, 1428 .dev_disconnect = snd_rawmidi_dev_disconnect, 1429 .dev_unregister = snd_rawmidi_dev_unregister 1430 }; 1431 1432 snd_assert(rrawmidi != NULL, return -EINVAL); 1433 *rrawmidi = NULL; 1434 snd_assert(card != NULL, return -ENXIO); 1435 rmidi = kzalloc(sizeof(*rmidi), GFP_KERNEL); 1436 if (rmidi == NULL) { 1437 snd_printk(KERN_ERR "rawmidi: cannot allocate\n"); 1438 return -ENOMEM; 1439 } 1440 rmidi->card = card; 1441 rmidi->device = device; 1442 mutex_init(&rmidi->open_mutex); 1443 init_waitqueue_head(&rmidi->open_wait); 1444 if (id != NULL) 1445 strlcpy(rmidi->id, id, sizeof(rmidi->id)); 1446 if ((err = snd_rawmidi_alloc_substreams(rmidi, 1447 &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT], 1448 SNDRV_RAWMIDI_STREAM_INPUT, 1449 input_count)) < 0) { 1450 snd_rawmidi_free(rmidi); 1451 return err; 1452 } 1453 if ((err = snd_rawmidi_alloc_substreams(rmidi, 1454 &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT], 1455 SNDRV_RAWMIDI_STREAM_OUTPUT, 1456 output_count)) < 0) { 1457 snd_rawmidi_free(rmidi); 1458 return err; 1459 } 1460 if ((err = snd_device_new(card, SNDRV_DEV_RAWMIDI, rmidi, &ops)) < 0) { 1461 snd_rawmidi_free(rmidi); 1462 return err; 1463 } 1464 *rrawmidi = rmidi; 1465 return 0; 1466 } 1467 1468 static void snd_rawmidi_free_substreams(struct snd_rawmidi_str *stream) 1469 { 1470 struct snd_rawmidi_substream *substream; 1471 1472 while (!list_empty(&stream->substreams)) { 1473 substream = list_entry(stream->substreams.next, struct snd_rawmidi_substream, list); 1474 list_del(&substream->list); 1475 kfree(substream); 1476 } 1477 } 1478 1479 static int snd_rawmidi_free(struct snd_rawmidi *rmidi) 1480 { 1481 snd_assert(rmidi != NULL, return -ENXIO); 1482 snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT]); 1483 snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT]); 1484 if (rmidi->private_free) 1485 rmidi->private_free(rmidi); 1486 kfree(rmidi); 1487 return 0; 1488 } 1489 1490 static int snd_rawmidi_dev_free(struct snd_device *device) 1491 { 1492 struct snd_rawmidi *rmidi = device->device_data; 1493 return snd_rawmidi_free(rmidi); 1494 } 1495 1496 #if defined(CONFIG_SND_SEQUENCER) || (defined(MODULE) && defined(CONFIG_SND_SEQUENCER_MODULE)) 1497 static void snd_rawmidi_dev_seq_free(struct snd_seq_device *device) 1498 { 1499 struct snd_rawmidi *rmidi = device->private_data; 1500 rmidi->seq_dev = NULL; 1501 } 1502 #endif 1503 1504 static int snd_rawmidi_dev_register(struct snd_device *device) 1505 { 1506 int err; 1507 struct snd_info_entry *entry; 1508 char name[16]; 1509 struct snd_rawmidi *rmidi = device->device_data; 1510 1511 if (rmidi->device >= SNDRV_RAWMIDI_DEVICES) 1512 return -ENOMEM; 1513 mutex_lock(®ister_mutex); 1514 if (snd_rawmidi_search(rmidi->card, rmidi->device)) { 1515 mutex_unlock(®ister_mutex); 1516 return -EBUSY; 1517 } 1518 list_add_tail(&rmidi->list, &snd_rawmidi_devices); 1519 sprintf(name, "midiC%iD%i", rmidi->card->number, rmidi->device); 1520 if ((err = snd_register_device(SNDRV_DEVICE_TYPE_RAWMIDI, 1521 rmidi->card, rmidi->device, 1522 &snd_rawmidi_f_ops, rmidi, name)) < 0) { 1523 snd_printk(KERN_ERR "unable to register rawmidi device %i:%i\n", rmidi->card->number, rmidi->device); 1524 list_del(&rmidi->list); 1525 mutex_unlock(®ister_mutex); 1526 return err; 1527 } 1528 if (rmidi->ops && rmidi->ops->dev_register && 1529 (err = rmidi->ops->dev_register(rmidi)) < 0) { 1530 snd_unregister_device(SNDRV_DEVICE_TYPE_RAWMIDI, rmidi->card, rmidi->device); 1531 list_del(&rmidi->list); 1532 mutex_unlock(®ister_mutex); 1533 return err; 1534 } 1535 #ifdef CONFIG_SND_OSSEMUL 1536 rmidi->ossreg = 0; 1537 if ((int)rmidi->device == midi_map[rmidi->card->number]) { 1538 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, 1539 rmidi->card, 0, &snd_rawmidi_f_ops, 1540 rmidi, name) < 0) { 1541 snd_printk(KERN_ERR "unable to register OSS rawmidi device %i:%i\n", rmidi->card->number, 0); 1542 } else { 1543 rmidi->ossreg++; 1544 #ifdef SNDRV_OSS_INFO_DEV_MIDI 1545 snd_oss_info_register(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number, rmidi->name); 1546 #endif 1547 } 1548 } 1549 if ((int)rmidi->device == amidi_map[rmidi->card->number]) { 1550 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, 1551 rmidi->card, 1, &snd_rawmidi_f_ops, 1552 rmidi, name) < 0) { 1553 snd_printk(KERN_ERR "unable to register OSS rawmidi device %i:%i\n", rmidi->card->number, 1); 1554 } else { 1555 rmidi->ossreg++; 1556 } 1557 } 1558 #endif /* CONFIG_SND_OSSEMUL */ 1559 mutex_unlock(®ister_mutex); 1560 sprintf(name, "midi%d", rmidi->device); 1561 entry = snd_info_create_card_entry(rmidi->card, name, rmidi->card->proc_root); 1562 if (entry) { 1563 entry->private_data = rmidi; 1564 entry->c.text.read = snd_rawmidi_proc_info_read; 1565 if (snd_info_register(entry) < 0) { 1566 snd_info_free_entry(entry); 1567 entry = NULL; 1568 } 1569 } 1570 rmidi->proc_entry = entry; 1571 #if defined(CONFIG_SND_SEQUENCER) || (defined(MODULE) && defined(CONFIG_SND_SEQUENCER_MODULE)) 1572 if (!rmidi->ops || !rmidi->ops->dev_register) { /* own registration mechanism */ 1573 if (snd_seq_device_new(rmidi->card, rmidi->device, SNDRV_SEQ_DEV_ID_MIDISYNTH, 0, &rmidi->seq_dev) >= 0) { 1574 rmidi->seq_dev->private_data = rmidi; 1575 rmidi->seq_dev->private_free = snd_rawmidi_dev_seq_free; 1576 sprintf(rmidi->seq_dev->name, "MIDI %d-%d", rmidi->card->number, rmidi->device); 1577 snd_device_register(rmidi->card, rmidi->seq_dev); 1578 } 1579 } 1580 #endif 1581 return 0; 1582 } 1583 1584 static int snd_rawmidi_dev_disconnect(struct snd_device *device) 1585 { 1586 struct snd_rawmidi *rmidi = device->device_data; 1587 1588 mutex_lock(®ister_mutex); 1589 list_del_init(&rmidi->list); 1590 mutex_unlock(®ister_mutex); 1591 return 0; 1592 } 1593 1594 static int snd_rawmidi_dev_unregister(struct snd_device *device) 1595 { 1596 struct snd_rawmidi *rmidi = device->device_data; 1597 1598 snd_assert(rmidi != NULL, return -ENXIO); 1599 mutex_lock(®ister_mutex); 1600 list_del(&rmidi->list); 1601 if (rmidi->proc_entry) { 1602 snd_info_unregister(rmidi->proc_entry); 1603 rmidi->proc_entry = NULL; 1604 } 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 if (rmidi->ops && rmidi->ops->dev_unregister) 1619 rmidi->ops->dev_unregister(rmidi); 1620 snd_unregister_device(SNDRV_DEVICE_TYPE_RAWMIDI, rmidi->card, rmidi->device); 1621 mutex_unlock(®ister_mutex); 1622 #if defined(CONFIG_SND_SEQUENCER) || (defined(MODULE) && defined(CONFIG_SND_SEQUENCER_MODULE)) 1623 if (rmidi->seq_dev) { 1624 snd_device_free(rmidi->card, rmidi->seq_dev); 1625 rmidi->seq_dev = NULL; 1626 } 1627 #endif 1628 return snd_rawmidi_free(rmidi); 1629 } 1630 1631 /** 1632 * snd_rawmidi_set_ops - set the rawmidi operators 1633 * @rmidi: the rawmidi instance 1634 * @stream: the stream direction, SNDRV_RAWMIDI_STREAM_XXX 1635 * @ops: the operator table 1636 * 1637 * Sets the rawmidi operators for the given stream direction. 1638 */ 1639 void snd_rawmidi_set_ops(struct snd_rawmidi *rmidi, int stream, 1640 struct snd_rawmidi_ops *ops) 1641 { 1642 struct list_head *list; 1643 struct snd_rawmidi_substream *substream; 1644 1645 list_for_each(list, &rmidi->streams[stream].substreams) { 1646 substream = list_entry(list, struct snd_rawmidi_substream, list); 1647 substream->ops = ops; 1648 } 1649 } 1650 1651 /* 1652 * ENTRY functions 1653 */ 1654 1655 static int __init alsa_rawmidi_init(void) 1656 { 1657 1658 snd_ctl_register_ioctl(snd_rawmidi_control_ioctl); 1659 snd_ctl_register_ioctl_compat(snd_rawmidi_control_ioctl); 1660 #ifdef CONFIG_SND_OSSEMUL 1661 { int i; 1662 /* check device map table */ 1663 for (i = 0; i < SNDRV_CARDS; i++) { 1664 if (midi_map[i] < 0 || midi_map[i] >= SNDRV_RAWMIDI_DEVICES) { 1665 snd_printk(KERN_ERR "invalid midi_map[%d] = %d\n", i, midi_map[i]); 1666 midi_map[i] = 0; 1667 } 1668 if (amidi_map[i] < 0 || amidi_map[i] >= SNDRV_RAWMIDI_DEVICES) { 1669 snd_printk(KERN_ERR "invalid amidi_map[%d] = %d\n", i, amidi_map[i]); 1670 amidi_map[i] = 1; 1671 } 1672 } 1673 } 1674 #endif /* CONFIG_SND_OSSEMUL */ 1675 return 0; 1676 } 1677 1678 static void __exit alsa_rawmidi_exit(void) 1679 { 1680 snd_ctl_unregister_ioctl(snd_rawmidi_control_ioctl); 1681 snd_ctl_unregister_ioctl_compat(snd_rawmidi_control_ioctl); 1682 } 1683 1684 module_init(alsa_rawmidi_init) 1685 module_exit(alsa_rawmidi_exit) 1686 1687 EXPORT_SYMBOL(snd_rawmidi_output_params); 1688 EXPORT_SYMBOL(snd_rawmidi_input_params); 1689 EXPORT_SYMBOL(snd_rawmidi_drop_output); 1690 EXPORT_SYMBOL(snd_rawmidi_drain_output); 1691 EXPORT_SYMBOL(snd_rawmidi_drain_input); 1692 EXPORT_SYMBOL(snd_rawmidi_receive); 1693 EXPORT_SYMBOL(snd_rawmidi_transmit_empty); 1694 EXPORT_SYMBOL(snd_rawmidi_transmit_peek); 1695 EXPORT_SYMBOL(snd_rawmidi_transmit_ack); 1696 EXPORT_SYMBOL(snd_rawmidi_transmit); 1697 EXPORT_SYMBOL(snd_rawmidi_new); 1698 EXPORT_SYMBOL(snd_rawmidi_set_ops); 1699 EXPORT_SYMBOL(snd_rawmidi_info_select); 1700 EXPORT_SYMBOL(snd_rawmidi_kernel_open); 1701 EXPORT_SYMBOL(snd_rawmidi_kernel_release); 1702 EXPORT_SYMBOL(snd_rawmidi_kernel_read); 1703 EXPORT_SYMBOL(snd_rawmidi_kernel_write); 1704