1 /* 2 * ALSA sequencer Client Manager 3 * Copyright (c) 1998-2001 by Frank van de Pol <fvdpol@coil.demon.nl> 4 * Jaroslav Kysela <perex@suse.cz> 5 * Takashi Iwai <tiwai@suse.de> 6 * 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License as published by 10 * the Free Software Foundation; either version 2 of the License, or 11 * (at your option) any later version. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 * 18 * You should have received a copy of the GNU General Public License 19 * along with this program; if not, write to the Free Software 20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 21 * 22 */ 23 24 #include <sound/driver.h> 25 #include <linux/init.h> 26 #include <linux/smp_lock.h> 27 #include <linux/slab.h> 28 #include <sound/core.h> 29 #include <sound/minors.h> 30 #include <linux/kmod.h> 31 32 #include <sound/seq_kernel.h> 33 #include "seq_clientmgr.h" 34 #include "seq_memory.h" 35 #include "seq_queue.h" 36 #include "seq_timer.h" 37 #include "seq_info.h" 38 #include "seq_system.h" 39 #include <sound/seq_device.h> 40 #ifdef CONFIG_COMPAT 41 #include <linux/compat.h> 42 #endif 43 44 /* Client Manager 45 46 * this module handles the connections of userland and kernel clients 47 * 48 */ 49 50 #define SNDRV_SEQ_LFLG_INPUT 0x0001 51 #define SNDRV_SEQ_LFLG_OUTPUT 0x0002 52 #define SNDRV_SEQ_LFLG_OPEN (SNDRV_SEQ_LFLG_INPUT|SNDRV_SEQ_LFLG_OUTPUT) 53 54 static DEFINE_SPINLOCK(clients_lock); 55 static DECLARE_MUTEX(register_mutex); 56 57 /* 58 * client table 59 */ 60 static char clienttablock[SNDRV_SEQ_MAX_CLIENTS]; 61 static client_t *clienttab[SNDRV_SEQ_MAX_CLIENTS]; 62 static usage_t client_usage; 63 64 /* 65 * prototypes 66 */ 67 static int bounce_error_event(client_t *client, snd_seq_event_t *event, int err, int atomic, int hop); 68 static int snd_seq_deliver_single_event(client_t *client, snd_seq_event_t *event, int filter, int atomic, int hop); 69 70 /* 71 */ 72 73 static inline mm_segment_t snd_enter_user(void) 74 { 75 mm_segment_t fs = get_fs(); 76 set_fs(get_ds()); 77 return fs; 78 } 79 80 static inline void snd_leave_user(mm_segment_t fs) 81 { 82 set_fs(fs); 83 } 84 85 /* 86 */ 87 static inline unsigned short snd_seq_file_flags(struct file *file) 88 { 89 switch (file->f_mode & (FMODE_READ | FMODE_WRITE)) { 90 case FMODE_WRITE: 91 return SNDRV_SEQ_LFLG_OUTPUT; 92 case FMODE_READ: 93 return SNDRV_SEQ_LFLG_INPUT; 94 default: 95 return SNDRV_SEQ_LFLG_OPEN; 96 } 97 } 98 99 static inline int snd_seq_write_pool_allocated(client_t *client) 100 { 101 return snd_seq_total_cells(client->pool) > 0; 102 } 103 104 /* return pointer to client structure for specified id */ 105 static client_t *clientptr(int clientid) 106 { 107 if (clientid < 0 || clientid >= SNDRV_SEQ_MAX_CLIENTS) { 108 snd_printd("Seq: oops. Trying to get pointer to client %d\n", clientid); 109 return NULL; 110 } 111 return clienttab[clientid]; 112 } 113 114 extern int seq_client_load[]; 115 116 client_t *snd_seq_client_use_ptr(int clientid) 117 { 118 unsigned long flags; 119 client_t *client; 120 121 if (clientid < 0 || clientid >= SNDRV_SEQ_MAX_CLIENTS) { 122 snd_printd("Seq: oops. Trying to get pointer to client %d\n", clientid); 123 return NULL; 124 } 125 spin_lock_irqsave(&clients_lock, flags); 126 client = clientptr(clientid); 127 if (client) 128 goto __lock; 129 if (clienttablock[clientid]) { 130 spin_unlock_irqrestore(&clients_lock, flags); 131 return NULL; 132 } 133 spin_unlock_irqrestore(&clients_lock, flags); 134 #ifdef CONFIG_KMOD 135 if (!in_interrupt() && current->fs->root) { 136 static char client_requested[64]; 137 static char card_requested[SNDRV_CARDS]; 138 if (clientid < 64) { 139 int idx; 140 141 if (! client_requested[clientid] && current->fs->root) { 142 client_requested[clientid] = 1; 143 for (idx = 0; idx < 64; idx++) { 144 if (seq_client_load[idx] < 0) 145 break; 146 if (seq_client_load[idx] == clientid) { 147 request_module("snd-seq-client-%i", clientid); 148 break; 149 } 150 } 151 } 152 } else if (clientid >= 64 && clientid < 128) { 153 int card = (clientid - 64) / 8; 154 if (card < snd_ecards_limit) { 155 if (! card_requested[card]) { 156 card_requested[card] = 1; 157 snd_request_card(card); 158 } 159 snd_seq_device_load_drivers(); 160 } 161 } 162 spin_lock_irqsave(&clients_lock, flags); 163 client = clientptr(clientid); 164 if (client) 165 goto __lock; 166 spin_unlock_irqrestore(&clients_lock, flags); 167 } 168 #endif 169 return NULL; 170 171 __lock: 172 snd_use_lock_use(&client->use_lock); 173 spin_unlock_irqrestore(&clients_lock, flags); 174 return client; 175 } 176 177 static void usage_alloc(usage_t * res, int num) 178 { 179 res->cur += num; 180 if (res->cur > res->peak) 181 res->peak = res->cur; 182 } 183 184 static void usage_free(usage_t * res, int num) 185 { 186 res->cur -= num; 187 } 188 189 /* initialise data structures */ 190 int __init client_init_data(void) 191 { 192 /* zap out the client table */ 193 memset(&clienttablock, 0, sizeof(clienttablock)); 194 memset(&clienttab, 0, sizeof(clienttab)); 195 return 0; 196 } 197 198 199 static client_t *seq_create_client1(int client_index, int poolsize) 200 { 201 unsigned long flags; 202 int c; 203 client_t *client; 204 205 /* init client data */ 206 client = kcalloc(1, sizeof(*client), GFP_KERNEL); 207 if (client == NULL) 208 return NULL; 209 client->pool = snd_seq_pool_new(poolsize); 210 if (client->pool == NULL) { 211 kfree(client); 212 return NULL; 213 } 214 client->type = NO_CLIENT; 215 snd_use_lock_init(&client->use_lock); 216 rwlock_init(&client->ports_lock); 217 init_MUTEX(&client->ports_mutex); 218 INIT_LIST_HEAD(&client->ports_list_head); 219 220 /* find free slot in the client table */ 221 spin_lock_irqsave(&clients_lock, flags); 222 if (client_index < 0) { 223 for (c = 128; c < SNDRV_SEQ_MAX_CLIENTS; c++) { 224 if (clienttab[c] || clienttablock[c]) 225 continue; 226 clienttab[client->number = c] = client; 227 spin_unlock_irqrestore(&clients_lock, flags); 228 return client; 229 } 230 } else { 231 if (clienttab[client_index] == NULL && !clienttablock[client_index]) { 232 clienttab[client->number = client_index] = client; 233 spin_unlock_irqrestore(&clients_lock, flags); 234 return client; 235 } 236 } 237 spin_unlock_irqrestore(&clients_lock, flags); 238 snd_seq_pool_delete(&client->pool); 239 kfree(client); 240 return NULL; /* no free slot found or busy, return failure code */ 241 } 242 243 244 static int seq_free_client1(client_t *client) 245 { 246 unsigned long flags; 247 248 snd_assert(client != NULL, return -EINVAL); 249 snd_seq_delete_all_ports(client); 250 snd_seq_queue_client_leave(client->number); 251 spin_lock_irqsave(&clients_lock, flags); 252 clienttablock[client->number] = 1; 253 clienttab[client->number] = NULL; 254 spin_unlock_irqrestore(&clients_lock, flags); 255 snd_use_lock_sync(&client->use_lock); 256 snd_seq_queue_client_termination(client->number); 257 if (client->pool) 258 snd_seq_pool_delete(&client->pool); 259 spin_lock_irqsave(&clients_lock, flags); 260 clienttablock[client->number] = 0; 261 spin_unlock_irqrestore(&clients_lock, flags); 262 return 0; 263 } 264 265 266 static void seq_free_client(client_t * client) 267 { 268 down(®ister_mutex); 269 switch (client->type) { 270 case NO_CLIENT: 271 snd_printk(KERN_WARNING "Seq: Trying to free unused client %d\n", client->number); 272 break; 273 case USER_CLIENT: 274 case KERNEL_CLIENT: 275 seq_free_client1(client); 276 usage_free(&client_usage, 1); 277 break; 278 279 default: 280 snd_printk(KERN_ERR "Seq: Trying to free client %d with undefined type = %d\n", client->number, client->type); 281 } 282 up(®ister_mutex); 283 284 snd_seq_system_client_ev_client_exit(client->number); 285 } 286 287 288 289 /* -------------------------------------------------------- */ 290 291 /* create a user client */ 292 static int snd_seq_open(struct inode *inode, struct file *file) 293 { 294 int c, mode; /* client id */ 295 client_t *client; 296 user_client_t *user; 297 298 if (down_interruptible(®ister_mutex)) 299 return -ERESTARTSYS; 300 client = seq_create_client1(-1, SNDRV_SEQ_DEFAULT_EVENTS); 301 if (client == NULL) { 302 up(®ister_mutex); 303 return -ENOMEM; /* failure code */ 304 } 305 306 mode = snd_seq_file_flags(file); 307 if (mode & SNDRV_SEQ_LFLG_INPUT) 308 client->accept_input = 1; 309 if (mode & SNDRV_SEQ_LFLG_OUTPUT) 310 client->accept_output = 1; 311 312 user = &client->data.user; 313 user->fifo = NULL; 314 user->fifo_pool_size = 0; 315 316 if (mode & SNDRV_SEQ_LFLG_INPUT) { 317 user->fifo_pool_size = SNDRV_SEQ_DEFAULT_CLIENT_EVENTS; 318 user->fifo = snd_seq_fifo_new(user->fifo_pool_size); 319 if (user->fifo == NULL) { 320 seq_free_client1(client); 321 kfree(client); 322 up(®ister_mutex); 323 return -ENOMEM; 324 } 325 } 326 327 usage_alloc(&client_usage, 1); 328 client->type = USER_CLIENT; 329 up(®ister_mutex); 330 331 c = client->number; 332 file->private_data = client; 333 334 /* fill client data */ 335 user->file = file; 336 sprintf(client->name, "Client-%d", c); 337 338 /* make others aware this new client */ 339 snd_seq_system_client_ev_client_start(c); 340 341 return 0; 342 } 343 344 /* delete a user client */ 345 static int snd_seq_release(struct inode *inode, struct file *file) 346 { 347 client_t *client = (client_t *) file->private_data; 348 349 if (client) { 350 seq_free_client(client); 351 if (client->data.user.fifo) 352 snd_seq_fifo_delete(&client->data.user.fifo); 353 kfree(client); 354 } 355 356 return 0; 357 } 358 359 360 /* handle client read() */ 361 /* possible error values: 362 * -ENXIO invalid client or file open mode 363 * -ENOSPC FIFO overflow (the flag is cleared after this error report) 364 * -EINVAL no enough user-space buffer to write the whole event 365 * -EFAULT seg. fault during copy to user space 366 */ 367 static ssize_t snd_seq_read(struct file *file, char __user *buf, size_t count, loff_t *offset) 368 { 369 client_t *client = (client_t *) file->private_data; 370 fifo_t *fifo; 371 int err; 372 long result = 0; 373 snd_seq_event_cell_t *cell; 374 375 if (!(snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_INPUT)) 376 return -ENXIO; 377 378 if (!access_ok(VERIFY_WRITE, buf, count)) 379 return -EFAULT; 380 381 /* check client structures are in place */ 382 snd_assert(client != NULL, return -ENXIO); 383 384 if (!client->accept_input || (fifo = client->data.user.fifo) == NULL) 385 return -ENXIO; 386 387 if (atomic_read(&fifo->overflow) > 0) { 388 /* buffer overflow is detected */ 389 snd_seq_fifo_clear(fifo); 390 /* return error code */ 391 return -ENOSPC; 392 } 393 394 cell = NULL; 395 err = 0; 396 snd_seq_fifo_lock(fifo); 397 398 /* while data available in queue */ 399 while (count >= sizeof(snd_seq_event_t)) { 400 int nonblock; 401 402 nonblock = (file->f_flags & O_NONBLOCK) || result > 0; 403 if ((err = snd_seq_fifo_cell_out(fifo, &cell, nonblock)) < 0) { 404 break; 405 } 406 if (snd_seq_ev_is_variable(&cell->event)) { 407 snd_seq_event_t tmpev; 408 tmpev = cell->event; 409 tmpev.data.ext.len &= ~SNDRV_SEQ_EXT_MASK; 410 if (copy_to_user(buf, &tmpev, sizeof(snd_seq_event_t))) { 411 err = -EFAULT; 412 break; 413 } 414 count -= sizeof(snd_seq_event_t); 415 buf += sizeof(snd_seq_event_t); 416 err = snd_seq_expand_var_event(&cell->event, count, (char *)buf, 0, sizeof(snd_seq_event_t)); 417 if (err < 0) 418 break; 419 result += err; 420 count -= err; 421 buf += err; 422 } else { 423 if (copy_to_user(buf, &cell->event, sizeof(snd_seq_event_t))) { 424 err = -EFAULT; 425 break; 426 } 427 count -= sizeof(snd_seq_event_t); 428 buf += sizeof(snd_seq_event_t); 429 } 430 snd_seq_cell_free(cell); 431 cell = NULL; /* to be sure */ 432 result += sizeof(snd_seq_event_t); 433 } 434 435 if (err < 0) { 436 if (cell) 437 snd_seq_fifo_cell_putback(fifo, cell); 438 if (err == -EAGAIN && result > 0) 439 err = 0; 440 } 441 snd_seq_fifo_unlock(fifo); 442 443 return (err < 0) ? err : result; 444 } 445 446 447 /* 448 * check access permission to the port 449 */ 450 static int check_port_perm(client_port_t *port, unsigned int flags) 451 { 452 if ((port->capability & flags) != flags) 453 return 0; 454 return flags; 455 } 456 457 /* 458 * check if the destination client is available, and return the pointer 459 * if filter is non-zero, client filter bitmap is tested. 460 */ 461 static client_t *get_event_dest_client(snd_seq_event_t *event, int filter) 462 { 463 client_t *dest; 464 465 dest = snd_seq_client_use_ptr(event->dest.client); 466 if (dest == NULL) 467 return NULL; 468 if (! dest->accept_input) 469 goto __not_avail; 470 if ((dest->filter & SNDRV_SEQ_FILTER_USE_EVENT) && 471 ! test_bit(event->type, dest->event_filter)) 472 goto __not_avail; 473 if (filter && !(dest->filter & filter)) 474 goto __not_avail; 475 476 return dest; /* ok - accessible */ 477 __not_avail: 478 snd_seq_client_unlock(dest); 479 return NULL; 480 } 481 482 483 /* 484 * Return the error event. 485 * 486 * If the receiver client is a user client, the original event is 487 * encapsulated in SNDRV_SEQ_EVENT_BOUNCE as variable length event. If 488 * the original event is also variable length, the external data is 489 * copied after the event record. 490 * If the receiver client is a kernel client, the original event is 491 * quoted in SNDRV_SEQ_EVENT_KERNEL_ERROR, since this requires no extra 492 * kmalloc. 493 */ 494 static int bounce_error_event(client_t *client, snd_seq_event_t *event, 495 int err, int atomic, int hop) 496 { 497 snd_seq_event_t bounce_ev; 498 int result; 499 500 if (client == NULL || 501 ! (client->filter & SNDRV_SEQ_FILTER_BOUNCE) || 502 ! client->accept_input) 503 return 0; /* ignored */ 504 505 /* set up quoted error */ 506 memset(&bounce_ev, 0, sizeof(bounce_ev)); 507 bounce_ev.type = SNDRV_SEQ_EVENT_KERNEL_ERROR; 508 bounce_ev.flags = SNDRV_SEQ_EVENT_LENGTH_FIXED; 509 bounce_ev.queue = SNDRV_SEQ_QUEUE_DIRECT; 510 bounce_ev.source.client = SNDRV_SEQ_CLIENT_SYSTEM; 511 bounce_ev.source.port = SNDRV_SEQ_PORT_SYSTEM_ANNOUNCE; 512 bounce_ev.dest.client = client->number; 513 bounce_ev.dest.port = event->source.port; 514 bounce_ev.data.quote.origin = event->dest; 515 bounce_ev.data.quote.event = event; 516 bounce_ev.data.quote.value = -err; /* use positive value */ 517 result = snd_seq_deliver_single_event(NULL, &bounce_ev, 0, atomic, hop + 1); 518 if (result < 0) { 519 client->event_lost++; 520 return result; 521 } 522 523 return result; 524 } 525 526 527 /* 528 * rewrite the time-stamp of the event record with the curren time 529 * of the given queue. 530 * return non-zero if updated. 531 */ 532 static int update_timestamp_of_queue(snd_seq_event_t *event, int queue, int real_time) 533 { 534 queue_t *q; 535 536 q = queueptr(queue); 537 if (! q) 538 return 0; 539 event->queue = queue; 540 event->flags &= ~SNDRV_SEQ_TIME_STAMP_MASK; 541 if (real_time) { 542 event->time.time = snd_seq_timer_get_cur_time(q->timer); 543 event->flags |= SNDRV_SEQ_TIME_STAMP_REAL; 544 } else { 545 event->time.tick = snd_seq_timer_get_cur_tick(q->timer); 546 event->flags |= SNDRV_SEQ_TIME_STAMP_TICK; 547 } 548 queuefree(q); 549 return 1; 550 } 551 552 553 /* 554 * deliver an event to the specified destination. 555 * if filter is non-zero, client filter bitmap is tested. 556 * 557 * RETURN VALUE: 0 : if succeeded 558 * <0 : error 559 */ 560 static int snd_seq_deliver_single_event(client_t *client, 561 snd_seq_event_t *event, 562 int filter, int atomic, int hop) 563 { 564 client_t *dest = NULL; 565 client_port_t *dest_port = NULL; 566 int result = -ENOENT; 567 int direct; 568 569 direct = snd_seq_ev_is_direct(event); 570 571 dest = get_event_dest_client(event, filter); 572 if (dest == NULL) 573 goto __skip; 574 dest_port = snd_seq_port_use_ptr(dest, event->dest.port); 575 if (dest_port == NULL) 576 goto __skip; 577 578 /* check permission */ 579 if (! check_port_perm(dest_port, SNDRV_SEQ_PORT_CAP_WRITE)) { 580 result = -EPERM; 581 goto __skip; 582 } 583 584 if (dest_port->timestamping) 585 update_timestamp_of_queue(event, dest_port->time_queue, 586 dest_port->time_real); 587 588 switch (dest->type) { 589 case USER_CLIENT: 590 if (dest->data.user.fifo) 591 result = snd_seq_fifo_event_in(dest->data.user.fifo, event); 592 break; 593 594 case KERNEL_CLIENT: 595 if (dest_port->event_input == NULL) 596 break; 597 result = dest_port->event_input(event, direct, dest_port->private_data, atomic, hop); 598 break; 599 default: 600 break; 601 } 602 603 __skip: 604 if (dest_port) 605 snd_seq_port_unlock(dest_port); 606 if (dest) 607 snd_seq_client_unlock(dest); 608 609 if (result < 0 && !direct) { 610 result = bounce_error_event(client, event, result, atomic, hop); 611 } 612 return result; 613 } 614 615 616 /* 617 * send the event to all subscribers: 618 */ 619 static int deliver_to_subscribers(client_t *client, 620 snd_seq_event_t *event, 621 int atomic, int hop) 622 { 623 subscribers_t *subs; 624 int err = 0, num_ev = 0; 625 snd_seq_event_t event_saved; 626 client_port_t *src_port; 627 struct list_head *p; 628 port_subs_info_t *grp; 629 630 src_port = snd_seq_port_use_ptr(client, event->source.port); 631 if (src_port == NULL) 632 return -EINVAL; /* invalid source port */ 633 /* save original event record */ 634 event_saved = *event; 635 grp = &src_port->c_src; 636 637 /* lock list */ 638 if (atomic) 639 read_lock(&grp->list_lock); 640 else 641 down_read(&grp->list_mutex); 642 list_for_each(p, &grp->list_head) { 643 subs = list_entry(p, subscribers_t, src_list); 644 event->dest = subs->info.dest; 645 if (subs->info.flags & SNDRV_SEQ_PORT_SUBS_TIMESTAMP) 646 /* convert time according to flag with subscription */ 647 update_timestamp_of_queue(event, subs->info.queue, 648 subs->info.flags & SNDRV_SEQ_PORT_SUBS_TIME_REAL); 649 err = snd_seq_deliver_single_event(client, event, 650 0, atomic, hop); 651 if (err < 0) 652 break; 653 num_ev++; 654 /* restore original event record */ 655 *event = event_saved; 656 } 657 if (atomic) 658 read_unlock(&grp->list_lock); 659 else 660 up_read(&grp->list_mutex); 661 *event = event_saved; /* restore */ 662 snd_seq_port_unlock(src_port); 663 return (err < 0) ? err : num_ev; 664 } 665 666 667 #ifdef SUPPORT_BROADCAST 668 /* 669 * broadcast to all ports: 670 */ 671 static int port_broadcast_event(client_t *client, 672 snd_seq_event_t *event, 673 int atomic, int hop) 674 { 675 int num_ev = 0, err = 0; 676 client_t *dest_client; 677 struct list_head *p; 678 679 dest_client = get_event_dest_client(event, SNDRV_SEQ_FILTER_BROADCAST); 680 if (dest_client == NULL) 681 return 0; /* no matching destination */ 682 683 read_lock(&dest_client->ports_lock); 684 list_for_each(p, &dest_client->ports_list_head) { 685 client_port_t *port = list_entry(p, client_port_t, list); 686 event->dest.port = port->addr.port; 687 /* pass NULL as source client to avoid error bounce */ 688 err = snd_seq_deliver_single_event(NULL, event, 689 SNDRV_SEQ_FILTER_BROADCAST, 690 atomic, hop); 691 if (err < 0) 692 break; 693 num_ev++; 694 } 695 read_unlock(&dest_client->ports_lock); 696 snd_seq_client_unlock(dest_client); 697 event->dest.port = SNDRV_SEQ_ADDRESS_BROADCAST; /* restore */ 698 return (err < 0) ? err : num_ev; 699 } 700 701 /* 702 * send the event to all clients: 703 * if destination port is also ADDRESS_BROADCAST, deliver to all ports. 704 */ 705 static int broadcast_event(client_t *client, 706 snd_seq_event_t *event, int atomic, int hop) 707 { 708 int err = 0, num_ev = 0; 709 int dest; 710 snd_seq_addr_t addr; 711 712 addr = event->dest; /* save */ 713 714 for (dest = 0; dest < SNDRV_SEQ_MAX_CLIENTS; dest++) { 715 /* don't send to itself */ 716 if (dest == client->number) 717 continue; 718 event->dest.client = dest; 719 event->dest.port = addr.port; 720 if (addr.port == SNDRV_SEQ_ADDRESS_BROADCAST) 721 err = port_broadcast_event(client, event, atomic, hop); 722 else 723 /* pass NULL as source client to avoid error bounce */ 724 err = snd_seq_deliver_single_event(NULL, event, 725 SNDRV_SEQ_FILTER_BROADCAST, 726 atomic, hop); 727 if (err < 0) 728 break; 729 num_ev += err; 730 } 731 event->dest = addr; /* restore */ 732 return (err < 0) ? err : num_ev; 733 } 734 735 736 /* multicast - not supported yet */ 737 static int multicast_event(client_t *client, snd_seq_event_t *event, 738 int atomic, int hop) 739 { 740 snd_printd("seq: multicast not supported yet.\n"); 741 return 0; /* ignored */ 742 } 743 #endif /* SUPPORT_BROADCAST */ 744 745 746 /* deliver an event to the destination port(s). 747 * if the event is to subscribers or broadcast, the event is dispatched 748 * to multiple targets. 749 * 750 * RETURN VALUE: n > 0 : the number of delivered events. 751 * n == 0 : the event was not passed to any client. 752 * n < 0 : error - event was not processed. 753 */ 754 static int snd_seq_deliver_event(client_t *client, snd_seq_event_t *event, 755 int atomic, int hop) 756 { 757 int result; 758 759 hop++; 760 if (hop >= SNDRV_SEQ_MAX_HOPS) { 761 snd_printd("too long delivery path (%d:%d->%d:%d)\n", 762 event->source.client, event->source.port, 763 event->dest.client, event->dest.port); 764 return -EMLINK; 765 } 766 767 if (event->queue == SNDRV_SEQ_ADDRESS_SUBSCRIBERS || 768 event->dest.client == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) 769 result = deliver_to_subscribers(client, event, atomic, hop); 770 #ifdef SUPPORT_BROADCAST 771 else if (event->queue == SNDRV_SEQ_ADDRESS_BROADCAST || 772 event->dest.client == SNDRV_SEQ_ADDRESS_BROADCAST) 773 result = broadcast_event(client, event, atomic, hop); 774 else if (event->dest.client >= SNDRV_SEQ_MAX_CLIENTS) 775 result = multicast_event(client, event, atomic, hop); 776 else if (event->dest.port == SNDRV_SEQ_ADDRESS_BROADCAST) 777 result = port_broadcast_event(client, event, atomic, hop); 778 #endif 779 else 780 result = snd_seq_deliver_single_event(client, event, 0, atomic, hop); 781 782 return result; 783 } 784 785 /* 786 * dispatch an event cell: 787 * This function is called only from queue check routines in timer 788 * interrupts or after enqueued. 789 * The event cell shall be released or re-queued in this function. 790 * 791 * RETURN VALUE: n > 0 : the number of delivered events. 792 * n == 0 : the event was not passed to any client. 793 * n < 0 : error - event was not processed. 794 */ 795 int snd_seq_dispatch_event(snd_seq_event_cell_t *cell, int atomic, int hop) 796 { 797 client_t *client; 798 int result; 799 800 snd_assert(cell != NULL, return -EINVAL); 801 802 client = snd_seq_client_use_ptr(cell->event.source.client); 803 if (client == NULL) { 804 snd_seq_cell_free(cell); /* release this cell */ 805 return -EINVAL; 806 } 807 808 if (cell->event.type == SNDRV_SEQ_EVENT_NOTE) { 809 /* NOTE event: 810 * the event cell is re-used as a NOTE-OFF event and 811 * enqueued again. 812 */ 813 snd_seq_event_t tmpev, *ev; 814 815 /* reserve this event to enqueue note-off later */ 816 tmpev = cell->event; 817 tmpev.type = SNDRV_SEQ_EVENT_NOTEON; 818 result = snd_seq_deliver_event(client, &tmpev, atomic, hop); 819 820 /* 821 * This was originally a note event. We now re-use the 822 * cell for the note-off event. 823 */ 824 825 ev = &cell->event; 826 ev->type = SNDRV_SEQ_EVENT_NOTEOFF; 827 ev->flags |= SNDRV_SEQ_PRIORITY_HIGH; 828 829 /* add the duration time */ 830 switch (ev->flags & SNDRV_SEQ_TIME_STAMP_MASK) { 831 case SNDRV_SEQ_TIME_STAMP_TICK: 832 ev->time.tick += ev->data.note.duration; 833 break; 834 case SNDRV_SEQ_TIME_STAMP_REAL: 835 /* unit for duration is ms */ 836 ev->time.time.tv_nsec += 1000000 * (ev->data.note.duration % 1000); 837 ev->time.time.tv_sec += ev->data.note.duration / 1000 + 838 ev->time.time.tv_nsec / 1000000000; 839 ev->time.time.tv_nsec %= 1000000000; 840 break; 841 } 842 ev->data.note.velocity = ev->data.note.off_velocity; 843 844 /* Now queue this cell as the note off event */ 845 if (snd_seq_enqueue_event(cell, atomic, hop) < 0) 846 snd_seq_cell_free(cell); /* release this cell */ 847 848 } else { 849 /* Normal events: 850 * event cell is freed after processing the event 851 */ 852 853 result = snd_seq_deliver_event(client, &cell->event, atomic, hop); 854 snd_seq_cell_free(cell); 855 } 856 857 snd_seq_client_unlock(client); 858 return result; 859 } 860 861 862 /* Allocate a cell from client pool and enqueue it to queue: 863 * if pool is empty and blocking is TRUE, sleep until a new cell is 864 * available. 865 */ 866 static int snd_seq_client_enqueue_event(client_t *client, 867 snd_seq_event_t *event, 868 struct file *file, int blocking, 869 int atomic, int hop) 870 { 871 snd_seq_event_cell_t *cell; 872 int err; 873 874 /* special queue values - force direct passing */ 875 if (event->queue == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) { 876 event->dest.client = SNDRV_SEQ_ADDRESS_SUBSCRIBERS; 877 event->queue = SNDRV_SEQ_QUEUE_DIRECT; 878 } else 879 #ifdef SUPPORT_BROADCAST 880 if (event->queue == SNDRV_SEQ_ADDRESS_BROADCAST) { 881 event->dest.client = SNDRV_SEQ_ADDRESS_BROADCAST; 882 event->queue = SNDRV_SEQ_QUEUE_DIRECT; 883 } 884 #endif 885 if (event->dest.client == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) { 886 /* check presence of source port */ 887 client_port_t *src_port = snd_seq_port_use_ptr(client, event->source.port); 888 if (src_port == NULL) 889 return -EINVAL; 890 snd_seq_port_unlock(src_port); 891 } 892 893 /* direct event processing without enqueued */ 894 if (snd_seq_ev_is_direct(event)) { 895 if (event->type == SNDRV_SEQ_EVENT_NOTE) 896 return -EINVAL; /* this event must be enqueued! */ 897 return snd_seq_deliver_event(client, event, atomic, hop); 898 } 899 900 /* Not direct, normal queuing */ 901 if (snd_seq_queue_is_used(event->queue, client->number) <= 0) 902 return -EINVAL; /* invalid queue */ 903 if (! snd_seq_write_pool_allocated(client)) 904 return -ENXIO; /* queue is not allocated */ 905 906 /* allocate an event cell */ 907 err = snd_seq_event_dup(client->pool, event, &cell, !blocking || atomic, file); 908 if (err < 0) 909 return err; 910 911 /* we got a cell. enqueue it. */ 912 if ((err = snd_seq_enqueue_event(cell, atomic, hop)) < 0) { 913 snd_seq_cell_free(cell); 914 return err; 915 } 916 917 return 0; 918 } 919 920 921 /* 922 * check validity of event type and data length. 923 * return non-zero if invalid. 924 */ 925 static int check_event_type_and_length(snd_seq_event_t *ev) 926 { 927 switch (snd_seq_ev_length_type(ev)) { 928 case SNDRV_SEQ_EVENT_LENGTH_FIXED: 929 if (snd_seq_ev_is_variable_type(ev)) 930 return -EINVAL; 931 break; 932 case SNDRV_SEQ_EVENT_LENGTH_VARIABLE: 933 if (! snd_seq_ev_is_variable_type(ev) || 934 (ev->data.ext.len & ~SNDRV_SEQ_EXT_MASK) >= SNDRV_SEQ_MAX_EVENT_LEN) 935 return -EINVAL; 936 break; 937 case SNDRV_SEQ_EVENT_LENGTH_VARUSR: 938 if (! snd_seq_ev_is_instr_type(ev) || 939 ! snd_seq_ev_is_direct(ev)) 940 return -EINVAL; 941 break; 942 } 943 return 0; 944 } 945 946 947 /* handle write() */ 948 /* possible error values: 949 * -ENXIO invalid client or file open mode 950 * -ENOMEM malloc failed 951 * -EFAULT seg. fault during copy from user space 952 * -EINVAL invalid event 953 * -EAGAIN no space in output pool 954 * -EINTR interrupts while sleep 955 * -EMLINK too many hops 956 * others depends on return value from driver callback 957 */ 958 static ssize_t snd_seq_write(struct file *file, const char __user *buf, size_t count, loff_t *offset) 959 { 960 client_t *client = (client_t *) file->private_data; 961 int written = 0, len; 962 int err = -EINVAL; 963 snd_seq_event_t event; 964 965 if (!(snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT)) 966 return -ENXIO; 967 968 /* check client structures are in place */ 969 snd_assert(client != NULL, return -ENXIO); 970 971 if (!client->accept_output || client->pool == NULL) 972 return -ENXIO; 973 974 /* allocate the pool now if the pool is not allocated yet */ 975 if (client->pool->size > 0 && !snd_seq_write_pool_allocated(client)) { 976 if (snd_seq_pool_init(client->pool) < 0) 977 return -ENOMEM; 978 } 979 980 /* only process whole events */ 981 while (count >= sizeof(snd_seq_event_t)) { 982 /* Read in the event header from the user */ 983 len = sizeof(event); 984 if (copy_from_user(&event, buf, len)) { 985 err = -EFAULT; 986 break; 987 } 988 event.source.client = client->number; /* fill in client number */ 989 /* Check for extension data length */ 990 if (check_event_type_and_length(&event)) { 991 err = -EINVAL; 992 break; 993 } 994 995 /* check for special events */ 996 if (event.type == SNDRV_SEQ_EVENT_NONE) 997 goto __skip_event; 998 else if (snd_seq_ev_is_reserved(&event)) { 999 err = -EINVAL; 1000 break; 1001 } 1002 1003 if (snd_seq_ev_is_variable(&event)) { 1004 int extlen = event.data.ext.len & ~SNDRV_SEQ_EXT_MASK; 1005 if ((size_t)(extlen + len) > count) { 1006 /* back out, will get an error this time or next */ 1007 err = -EINVAL; 1008 break; 1009 } 1010 /* set user space pointer */ 1011 event.data.ext.len = extlen | SNDRV_SEQ_EXT_USRPTR; 1012 event.data.ext.ptr = (char*)buf + sizeof(snd_seq_event_t); 1013 len += extlen; /* increment data length */ 1014 } else { 1015 #ifdef CONFIG_COMPAT 1016 if (client->convert32 && snd_seq_ev_is_varusr(&event)) { 1017 void *ptr = compat_ptr(event.data.raw32.d[1]); 1018 event.data.ext.ptr = ptr; 1019 } 1020 #endif 1021 } 1022 1023 /* ok, enqueue it */ 1024 err = snd_seq_client_enqueue_event(client, &event, file, 1025 !(file->f_flags & O_NONBLOCK), 1026 0, 0); 1027 if (err < 0) 1028 break; 1029 1030 __skip_event: 1031 /* Update pointers and counts */ 1032 count -= len; 1033 buf += len; 1034 written += len; 1035 } 1036 1037 return written ? written : err; 1038 } 1039 1040 1041 /* 1042 * handle polling 1043 */ 1044 static unsigned int snd_seq_poll(struct file *file, poll_table * wait) 1045 { 1046 client_t *client = (client_t *) file->private_data; 1047 unsigned int mask = 0; 1048 1049 /* check client structures are in place */ 1050 snd_assert(client != NULL, return -ENXIO); 1051 1052 if ((snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_INPUT) && 1053 client->data.user.fifo) { 1054 1055 /* check if data is available in the outqueue */ 1056 if (snd_seq_fifo_poll_wait(client->data.user.fifo, file, wait)) 1057 mask |= POLLIN | POLLRDNORM; 1058 } 1059 1060 if (snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT) { 1061 1062 /* check if data is available in the pool */ 1063 if (!snd_seq_write_pool_allocated(client) || 1064 snd_seq_pool_poll_wait(client->pool, file, wait)) 1065 mask |= POLLOUT | POLLWRNORM; 1066 } 1067 1068 return mask; 1069 } 1070 1071 1072 /*-----------------------------------------------------*/ 1073 1074 1075 /* SYSTEM_INFO ioctl() */ 1076 static int snd_seq_ioctl_system_info(client_t *client, void __user *arg) 1077 { 1078 snd_seq_system_info_t info; 1079 1080 memset(&info, 0, sizeof(info)); 1081 /* fill the info fields */ 1082 info.queues = SNDRV_SEQ_MAX_QUEUES; 1083 info.clients = SNDRV_SEQ_MAX_CLIENTS; 1084 info.ports = 256; /* fixed limit */ 1085 info.channels = 256; /* fixed limit */ 1086 info.cur_clients = client_usage.cur; 1087 info.cur_queues = snd_seq_queue_get_cur_queues(); 1088 1089 if (copy_to_user(arg, &info, sizeof(info))) 1090 return -EFAULT; 1091 return 0; 1092 } 1093 1094 1095 /* RUNNING_MODE ioctl() */ 1096 static int snd_seq_ioctl_running_mode(client_t *client, void __user *arg) 1097 { 1098 struct sndrv_seq_running_info info; 1099 client_t *cptr; 1100 int err = 0; 1101 1102 if (copy_from_user(&info, arg, sizeof(info))) 1103 return -EFAULT; 1104 1105 /* requested client number */ 1106 cptr = snd_seq_client_use_ptr(info.client); 1107 if (cptr == NULL) 1108 return -ENOENT; /* don't change !!! */ 1109 1110 #ifdef SNDRV_BIG_ENDIAN 1111 if (! info.big_endian) { 1112 err = -EINVAL; 1113 goto __err; 1114 } 1115 #else 1116 if (info.big_endian) { 1117 err = -EINVAL; 1118 goto __err; 1119 } 1120 1121 #endif 1122 if (info.cpu_mode > sizeof(long)) { 1123 err = -EINVAL; 1124 goto __err; 1125 } 1126 cptr->convert32 = (info.cpu_mode < sizeof(long)); 1127 __err: 1128 snd_seq_client_unlock(cptr); 1129 return err; 1130 } 1131 1132 /* CLIENT_INFO ioctl() */ 1133 static void get_client_info(client_t *cptr, snd_seq_client_info_t *info) 1134 { 1135 info->client = cptr->number; 1136 1137 /* fill the info fields */ 1138 info->type = cptr->type; 1139 strcpy(info->name, cptr->name); 1140 info->filter = cptr->filter; 1141 info->event_lost = cptr->event_lost; 1142 memcpy(info->event_filter, cptr->event_filter, 32); 1143 info->num_ports = cptr->num_ports; 1144 memset(info->reserved, 0, sizeof(info->reserved)); 1145 } 1146 1147 static int snd_seq_ioctl_get_client_info(client_t * client, void __user *arg) 1148 { 1149 client_t *cptr; 1150 snd_seq_client_info_t client_info; 1151 1152 if (copy_from_user(&client_info, arg, sizeof(client_info))) 1153 return -EFAULT; 1154 1155 /* requested client number */ 1156 cptr = snd_seq_client_use_ptr(client_info.client); 1157 if (cptr == NULL) 1158 return -ENOENT; /* don't change !!! */ 1159 1160 get_client_info(cptr, &client_info); 1161 snd_seq_client_unlock(cptr); 1162 1163 if (copy_to_user(arg, &client_info, sizeof(client_info))) 1164 return -EFAULT; 1165 return 0; 1166 } 1167 1168 1169 /* CLIENT_INFO ioctl() */ 1170 static int snd_seq_ioctl_set_client_info(client_t * client, void __user *arg) 1171 { 1172 snd_seq_client_info_t client_info; 1173 1174 if (copy_from_user(&client_info, arg, sizeof(client_info))) 1175 return -EFAULT; 1176 1177 /* it is not allowed to set the info fields for an another client */ 1178 if (client->number != client_info.client) 1179 return -EPERM; 1180 /* also client type must be set now */ 1181 if (client->type != client_info.type) 1182 return -EINVAL; 1183 1184 /* fill the info fields */ 1185 if (client_info.name[0]) 1186 strlcpy(client->name, client_info.name, sizeof(client->name)); 1187 1188 client->filter = client_info.filter; 1189 client->event_lost = client_info.event_lost; 1190 memcpy(client->event_filter, client_info.event_filter, 32); 1191 1192 return 0; 1193 } 1194 1195 1196 /* 1197 * CREATE PORT ioctl() 1198 */ 1199 static int snd_seq_ioctl_create_port(client_t * client, void __user *arg) 1200 { 1201 client_port_t *port; 1202 snd_seq_port_info_t info; 1203 snd_seq_port_callback_t *callback; 1204 1205 if (copy_from_user(&info, arg, sizeof(info))) 1206 return -EFAULT; 1207 1208 /* it is not allowed to create the port for an another client */ 1209 if (info.addr.client != client->number) 1210 return -EPERM; 1211 1212 port = snd_seq_create_port(client, (info.flags & SNDRV_SEQ_PORT_FLG_GIVEN_PORT) ? info.addr.port : -1); 1213 if (port == NULL) 1214 return -ENOMEM; 1215 1216 if (client->type == USER_CLIENT && info.kernel) { 1217 snd_seq_delete_port(client, port->addr.port); 1218 return -EINVAL; 1219 } 1220 if (client->type == KERNEL_CLIENT) { 1221 if ((callback = info.kernel) != NULL) { 1222 if (callback->owner) 1223 port->owner = callback->owner; 1224 port->private_data = callback->private_data; 1225 port->private_free = callback->private_free; 1226 port->callback_all = callback->callback_all; 1227 port->event_input = callback->event_input; 1228 port->c_src.open = callback->subscribe; 1229 port->c_src.close = callback->unsubscribe; 1230 port->c_dest.open = callback->use; 1231 port->c_dest.close = callback->unuse; 1232 } 1233 } 1234 1235 info.addr = port->addr; 1236 1237 snd_seq_set_port_info(port, &info); 1238 snd_seq_system_client_ev_port_start(port->addr.client, port->addr.port); 1239 1240 if (copy_to_user(arg, &info, sizeof(info))) 1241 return -EFAULT; 1242 1243 return 0; 1244 } 1245 1246 /* 1247 * DELETE PORT ioctl() 1248 */ 1249 static int snd_seq_ioctl_delete_port(client_t * client, void __user *arg) 1250 { 1251 snd_seq_port_info_t info; 1252 int err; 1253 1254 /* set passed parameters */ 1255 if (copy_from_user(&info, arg, sizeof(info))) 1256 return -EFAULT; 1257 1258 /* it is not allowed to remove the port for an another client */ 1259 if (info.addr.client != client->number) 1260 return -EPERM; 1261 1262 err = snd_seq_delete_port(client, info.addr.port); 1263 if (err >= 0) 1264 snd_seq_system_client_ev_port_exit(client->number, info.addr.port); 1265 return err; 1266 } 1267 1268 1269 /* 1270 * GET_PORT_INFO ioctl() (on any client) 1271 */ 1272 static int snd_seq_ioctl_get_port_info(client_t *client, void __user *arg) 1273 { 1274 client_t *cptr; 1275 client_port_t *port; 1276 snd_seq_port_info_t info; 1277 1278 if (copy_from_user(&info, arg, sizeof(info))) 1279 return -EFAULT; 1280 cptr = snd_seq_client_use_ptr(info.addr.client); 1281 if (cptr == NULL) 1282 return -ENXIO; 1283 1284 port = snd_seq_port_use_ptr(cptr, info.addr.port); 1285 if (port == NULL) { 1286 snd_seq_client_unlock(cptr); 1287 return -ENOENT; /* don't change */ 1288 } 1289 1290 /* get port info */ 1291 snd_seq_get_port_info(port, &info); 1292 snd_seq_port_unlock(port); 1293 snd_seq_client_unlock(cptr); 1294 1295 if (copy_to_user(arg, &info, sizeof(info))) 1296 return -EFAULT; 1297 return 0; 1298 } 1299 1300 1301 /* 1302 * SET_PORT_INFO ioctl() (only ports on this/own client) 1303 */ 1304 static int snd_seq_ioctl_set_port_info(client_t * client, void __user *arg) 1305 { 1306 client_port_t *port; 1307 snd_seq_port_info_t info; 1308 1309 if (copy_from_user(&info, arg, sizeof(info))) 1310 return -EFAULT; 1311 1312 if (info.addr.client != client->number) /* only set our own ports ! */ 1313 return -EPERM; 1314 port = snd_seq_port_use_ptr(client, info.addr.port); 1315 if (port) { 1316 snd_seq_set_port_info(port, &info); 1317 snd_seq_port_unlock(port); 1318 } 1319 return 0; 1320 } 1321 1322 1323 /* 1324 * port subscription (connection) 1325 */ 1326 #define PERM_RD (SNDRV_SEQ_PORT_CAP_READ|SNDRV_SEQ_PORT_CAP_SUBS_READ) 1327 #define PERM_WR (SNDRV_SEQ_PORT_CAP_WRITE|SNDRV_SEQ_PORT_CAP_SUBS_WRITE) 1328 1329 static int check_subscription_permission(client_t *client, client_port_t *sport, 1330 client_port_t *dport, 1331 snd_seq_port_subscribe_t *subs) 1332 { 1333 if (client->number != subs->sender.client && 1334 client->number != subs->dest.client) { 1335 /* connection by third client - check export permission */ 1336 if (check_port_perm(sport, SNDRV_SEQ_PORT_CAP_NO_EXPORT)) 1337 return -EPERM; 1338 if (check_port_perm(dport, SNDRV_SEQ_PORT_CAP_NO_EXPORT)) 1339 return -EPERM; 1340 } 1341 1342 /* check read permission */ 1343 /* if sender or receiver is the subscribing client itself, 1344 * no permission check is necessary 1345 */ 1346 if (client->number != subs->sender.client) { 1347 if (! check_port_perm(sport, PERM_RD)) 1348 return -EPERM; 1349 } 1350 /* check write permission */ 1351 if (client->number != subs->dest.client) { 1352 if (! check_port_perm(dport, PERM_WR)) 1353 return -EPERM; 1354 } 1355 return 0; 1356 } 1357 1358 /* 1359 * send an subscription notify event to user client: 1360 * client must be user client. 1361 */ 1362 int snd_seq_client_notify_subscription(int client, int port, 1363 snd_seq_port_subscribe_t *info, int evtype) 1364 { 1365 snd_seq_event_t event; 1366 1367 memset(&event, 0, sizeof(event)); 1368 event.type = evtype; 1369 event.data.connect.dest = info->dest; 1370 event.data.connect.sender = info->sender; 1371 1372 return snd_seq_system_notify(client, port, &event); /* non-atomic */ 1373 } 1374 1375 1376 /* 1377 * add to port's subscription list IOCTL interface 1378 */ 1379 static int snd_seq_ioctl_subscribe_port(client_t * client, void __user *arg) 1380 { 1381 int result = -EINVAL; 1382 client_t *receiver = NULL, *sender = NULL; 1383 client_port_t *sport = NULL, *dport = NULL; 1384 snd_seq_port_subscribe_t subs; 1385 1386 if (copy_from_user(&subs, arg, sizeof(subs))) 1387 return -EFAULT; 1388 1389 if ((receiver = snd_seq_client_use_ptr(subs.dest.client)) == NULL) 1390 goto __end; 1391 if ((sender = snd_seq_client_use_ptr(subs.sender.client)) == NULL) 1392 goto __end; 1393 if ((sport = snd_seq_port_use_ptr(sender, subs.sender.port)) == NULL) 1394 goto __end; 1395 if ((dport = snd_seq_port_use_ptr(receiver, subs.dest.port)) == NULL) 1396 goto __end; 1397 1398 result = check_subscription_permission(client, sport, dport, &subs); 1399 if (result < 0) 1400 goto __end; 1401 1402 /* connect them */ 1403 result = snd_seq_port_connect(client, sender, sport, receiver, dport, &subs); 1404 if (! result) /* broadcast announce */ 1405 snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0, 1406 &subs, SNDRV_SEQ_EVENT_PORT_SUBSCRIBED); 1407 __end: 1408 if (sport) 1409 snd_seq_port_unlock(sport); 1410 if (dport) 1411 snd_seq_port_unlock(dport); 1412 if (sender) 1413 snd_seq_client_unlock(sender); 1414 if (receiver) 1415 snd_seq_client_unlock(receiver); 1416 return result; 1417 } 1418 1419 1420 /* 1421 * remove from port's subscription list 1422 */ 1423 static int snd_seq_ioctl_unsubscribe_port(client_t * client, void __user *arg) 1424 { 1425 int result = -ENXIO; 1426 client_t *receiver = NULL, *sender = NULL; 1427 client_port_t *sport = NULL, *dport = NULL; 1428 snd_seq_port_subscribe_t subs; 1429 1430 if (copy_from_user(&subs, arg, sizeof(subs))) 1431 return -EFAULT; 1432 1433 if ((receiver = snd_seq_client_use_ptr(subs.dest.client)) == NULL) 1434 goto __end; 1435 if ((sender = snd_seq_client_use_ptr(subs.sender.client)) == NULL) 1436 goto __end; 1437 if ((sport = snd_seq_port_use_ptr(sender, subs.sender.port)) == NULL) 1438 goto __end; 1439 if ((dport = snd_seq_port_use_ptr(receiver, subs.dest.port)) == NULL) 1440 goto __end; 1441 1442 result = check_subscription_permission(client, sport, dport, &subs); 1443 if (result < 0) 1444 goto __end; 1445 1446 result = snd_seq_port_disconnect(client, sender, sport, receiver, dport, &subs); 1447 if (! result) /* broadcast announce */ 1448 snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0, 1449 &subs, SNDRV_SEQ_EVENT_PORT_UNSUBSCRIBED); 1450 __end: 1451 if (sport) 1452 snd_seq_port_unlock(sport); 1453 if (dport) 1454 snd_seq_port_unlock(dport); 1455 if (sender) 1456 snd_seq_client_unlock(sender); 1457 if (receiver) 1458 snd_seq_client_unlock(receiver); 1459 return result; 1460 } 1461 1462 1463 /* CREATE_QUEUE ioctl() */ 1464 static int snd_seq_ioctl_create_queue(client_t *client, void __user *arg) 1465 { 1466 snd_seq_queue_info_t info; 1467 int result; 1468 queue_t *q; 1469 1470 if (copy_from_user(&info, arg, sizeof(info))) 1471 return -EFAULT; 1472 1473 result = snd_seq_queue_alloc(client->number, info.locked, info.flags); 1474 if (result < 0) 1475 return result; 1476 1477 q = queueptr(result); 1478 if (q == NULL) 1479 return -EINVAL; 1480 1481 info.queue = q->queue; 1482 info.locked = q->locked; 1483 info.owner = q->owner; 1484 1485 /* set queue name */ 1486 if (! info.name[0]) 1487 snprintf(info.name, sizeof(info.name), "Queue-%d", q->queue); 1488 strlcpy(q->name, info.name, sizeof(q->name)); 1489 queuefree(q); 1490 1491 if (copy_to_user(arg, &info, sizeof(info))) 1492 return -EFAULT; 1493 1494 return 0; 1495 } 1496 1497 /* DELETE_QUEUE ioctl() */ 1498 static int snd_seq_ioctl_delete_queue(client_t *client, void __user *arg) 1499 { 1500 snd_seq_queue_info_t info; 1501 1502 if (copy_from_user(&info, arg, sizeof(info))) 1503 return -EFAULT; 1504 1505 return snd_seq_queue_delete(client->number, info.queue); 1506 } 1507 1508 /* GET_QUEUE_INFO ioctl() */ 1509 static int snd_seq_ioctl_get_queue_info(client_t *client, void __user *arg) 1510 { 1511 snd_seq_queue_info_t info; 1512 queue_t *q; 1513 1514 if (copy_from_user(&info, arg, sizeof(info))) 1515 return -EFAULT; 1516 1517 q = queueptr(info.queue); 1518 if (q == NULL) 1519 return -EINVAL; 1520 1521 memset(&info, 0, sizeof(info)); 1522 info.queue = q->queue; 1523 info.owner = q->owner; 1524 info.locked = q->locked; 1525 strlcpy(info.name, q->name, sizeof(info.name)); 1526 queuefree(q); 1527 1528 if (copy_to_user(arg, &info, sizeof(info))) 1529 return -EFAULT; 1530 1531 return 0; 1532 } 1533 1534 /* SET_QUEUE_INFO ioctl() */ 1535 static int snd_seq_ioctl_set_queue_info(client_t *client, void __user *arg) 1536 { 1537 snd_seq_queue_info_t info; 1538 queue_t *q; 1539 1540 if (copy_from_user(&info, arg, sizeof(info))) 1541 return -EFAULT; 1542 1543 if (info.owner != client->number) 1544 return -EINVAL; 1545 1546 /* change owner/locked permission */ 1547 if (snd_seq_queue_check_access(info.queue, client->number)) { 1548 if (snd_seq_queue_set_owner(info.queue, client->number, info.locked) < 0) 1549 return -EPERM; 1550 if (info.locked) 1551 snd_seq_queue_use(info.queue, client->number, 1); 1552 } else { 1553 return -EPERM; 1554 } 1555 1556 q = queueptr(info.queue); 1557 if (! q) 1558 return -EINVAL; 1559 if (q->owner != client->number) { 1560 queuefree(q); 1561 return -EPERM; 1562 } 1563 strlcpy(q->name, info.name, sizeof(q->name)); 1564 queuefree(q); 1565 1566 return 0; 1567 } 1568 1569 /* GET_NAMED_QUEUE ioctl() */ 1570 static int snd_seq_ioctl_get_named_queue(client_t *client, void __user *arg) 1571 { 1572 snd_seq_queue_info_t info; 1573 queue_t *q; 1574 1575 if (copy_from_user(&info, arg, sizeof(info))) 1576 return -EFAULT; 1577 1578 q = snd_seq_queue_find_name(info.name); 1579 if (q == NULL) 1580 return -EINVAL; 1581 info.queue = q->queue; 1582 info.owner = q->owner; 1583 info.locked = q->locked; 1584 queuefree(q); 1585 1586 if (copy_to_user(arg, &info, sizeof(info))) 1587 return -EFAULT; 1588 1589 return 0; 1590 } 1591 1592 /* GET_QUEUE_STATUS ioctl() */ 1593 static int snd_seq_ioctl_get_queue_status(client_t * client, void __user *arg) 1594 { 1595 snd_seq_queue_status_t status; 1596 queue_t *queue; 1597 seq_timer_t *tmr; 1598 1599 if (copy_from_user(&status, arg, sizeof(status))) 1600 return -EFAULT; 1601 1602 queue = queueptr(status.queue); 1603 if (queue == NULL) 1604 return -EINVAL; 1605 memset(&status, 0, sizeof(status)); 1606 status.queue = queue->queue; 1607 1608 tmr = queue->timer; 1609 status.events = queue->tickq->cells + queue->timeq->cells; 1610 1611 status.time = snd_seq_timer_get_cur_time(tmr); 1612 status.tick = snd_seq_timer_get_cur_tick(tmr); 1613 1614 status.running = tmr->running; 1615 1616 status.flags = queue->flags; 1617 queuefree(queue); 1618 1619 if (copy_to_user(arg, &status, sizeof(status))) 1620 return -EFAULT; 1621 return 0; 1622 } 1623 1624 1625 /* GET_QUEUE_TEMPO ioctl() */ 1626 static int snd_seq_ioctl_get_queue_tempo(client_t * client, void __user *arg) 1627 { 1628 snd_seq_queue_tempo_t tempo; 1629 queue_t *queue; 1630 seq_timer_t *tmr; 1631 1632 if (copy_from_user(&tempo, arg, sizeof(tempo))) 1633 return -EFAULT; 1634 1635 queue = queueptr(tempo.queue); 1636 if (queue == NULL) 1637 return -EINVAL; 1638 memset(&tempo, 0, sizeof(tempo)); 1639 tempo.queue = queue->queue; 1640 1641 tmr = queue->timer; 1642 1643 tempo.tempo = tmr->tempo; 1644 tempo.ppq = tmr->ppq; 1645 tempo.skew_value = tmr->skew; 1646 tempo.skew_base = tmr->skew_base; 1647 queuefree(queue); 1648 1649 if (copy_to_user(arg, &tempo, sizeof(tempo))) 1650 return -EFAULT; 1651 return 0; 1652 } 1653 1654 1655 /* SET_QUEUE_TEMPO ioctl() */ 1656 int snd_seq_set_queue_tempo(int client, snd_seq_queue_tempo_t *tempo) 1657 { 1658 if (!snd_seq_queue_check_access(tempo->queue, client)) 1659 return -EPERM; 1660 return snd_seq_queue_timer_set_tempo(tempo->queue, client, tempo); 1661 } 1662 1663 static int snd_seq_ioctl_set_queue_tempo(client_t * client, void __user *arg) 1664 { 1665 int result; 1666 snd_seq_queue_tempo_t tempo; 1667 1668 if (copy_from_user(&tempo, arg, sizeof(tempo))) 1669 return -EFAULT; 1670 1671 result = snd_seq_set_queue_tempo(client->number, &tempo); 1672 return result < 0 ? result : 0; 1673 } 1674 1675 1676 /* GET_QUEUE_TIMER ioctl() */ 1677 static int snd_seq_ioctl_get_queue_timer(client_t * client, void __user *arg) 1678 { 1679 snd_seq_queue_timer_t timer; 1680 queue_t *queue; 1681 seq_timer_t *tmr; 1682 1683 if (copy_from_user(&timer, arg, sizeof(timer))) 1684 return -EFAULT; 1685 1686 queue = queueptr(timer.queue); 1687 if (queue == NULL) 1688 return -EINVAL; 1689 1690 if (down_interruptible(&queue->timer_mutex)) { 1691 queuefree(queue); 1692 return -ERESTARTSYS; 1693 } 1694 tmr = queue->timer; 1695 memset(&timer, 0, sizeof(timer)); 1696 timer.queue = queue->queue; 1697 1698 timer.type = tmr->type; 1699 if (tmr->type == SNDRV_SEQ_TIMER_ALSA) { 1700 timer.u.alsa.id = tmr->alsa_id; 1701 timer.u.alsa.resolution = tmr->preferred_resolution; 1702 } 1703 up(&queue->timer_mutex); 1704 queuefree(queue); 1705 1706 if (copy_to_user(arg, &timer, sizeof(timer))) 1707 return -EFAULT; 1708 return 0; 1709 } 1710 1711 1712 /* SET_QUEUE_TIMER ioctl() */ 1713 static int snd_seq_ioctl_set_queue_timer(client_t * client, void __user *arg) 1714 { 1715 int result = 0; 1716 snd_seq_queue_timer_t timer; 1717 1718 if (copy_from_user(&timer, arg, sizeof(timer))) 1719 return -EFAULT; 1720 1721 if (timer.type != SNDRV_SEQ_TIMER_ALSA) 1722 return -EINVAL; 1723 1724 if (snd_seq_queue_check_access(timer.queue, client->number)) { 1725 queue_t *q; 1726 seq_timer_t *tmr; 1727 1728 q = queueptr(timer.queue); 1729 if (q == NULL) 1730 return -ENXIO; 1731 if (down_interruptible(&q->timer_mutex)) { 1732 queuefree(q); 1733 return -ERESTARTSYS; 1734 } 1735 tmr = q->timer; 1736 snd_seq_queue_timer_close(timer.queue); 1737 tmr->type = timer.type; 1738 if (tmr->type == SNDRV_SEQ_TIMER_ALSA) { 1739 tmr->alsa_id = timer.u.alsa.id; 1740 tmr->preferred_resolution = timer.u.alsa.resolution; 1741 } 1742 result = snd_seq_queue_timer_open(timer.queue); 1743 up(&q->timer_mutex); 1744 queuefree(q); 1745 } else { 1746 return -EPERM; 1747 } 1748 1749 return result; 1750 } 1751 1752 1753 /* GET_QUEUE_CLIENT ioctl() */ 1754 static int snd_seq_ioctl_get_queue_client(client_t * client, void __user *arg) 1755 { 1756 snd_seq_queue_client_t info; 1757 int used; 1758 1759 if (copy_from_user(&info, arg, sizeof(info))) 1760 return -EFAULT; 1761 1762 used = snd_seq_queue_is_used(info.queue, client->number); 1763 if (used < 0) 1764 return -EINVAL; 1765 info.used = used; 1766 info.client = client->number; 1767 1768 if (copy_to_user(arg, &info, sizeof(info))) 1769 return -EFAULT; 1770 return 0; 1771 } 1772 1773 1774 /* SET_QUEUE_CLIENT ioctl() */ 1775 static int snd_seq_ioctl_set_queue_client(client_t * client, void __user *arg) 1776 { 1777 int err; 1778 snd_seq_queue_client_t info; 1779 1780 if (copy_from_user(&info, arg, sizeof(info))) 1781 return -EFAULT; 1782 1783 if (info.used >= 0) { 1784 err = snd_seq_queue_use(info.queue, client->number, info.used); 1785 if (err < 0) 1786 return err; 1787 } 1788 1789 return snd_seq_ioctl_get_queue_client(client, arg); 1790 } 1791 1792 1793 /* GET_CLIENT_POOL ioctl() */ 1794 static int snd_seq_ioctl_get_client_pool(client_t * client, void __user *arg) 1795 { 1796 snd_seq_client_pool_t info; 1797 client_t *cptr; 1798 1799 if (copy_from_user(&info, arg, sizeof(info))) 1800 return -EFAULT; 1801 1802 cptr = snd_seq_client_use_ptr(info.client); 1803 if (cptr == NULL) 1804 return -ENOENT; 1805 memset(&info, 0, sizeof(info)); 1806 info.output_pool = cptr->pool->size; 1807 info.output_room = cptr->pool->room; 1808 info.output_free = info.output_pool; 1809 if (cptr->pool) 1810 info.output_free = snd_seq_unused_cells(cptr->pool); 1811 if (cptr->type == USER_CLIENT) { 1812 info.input_pool = cptr->data.user.fifo_pool_size; 1813 info.input_free = info.input_pool; 1814 if (cptr->data.user.fifo) 1815 info.input_free = snd_seq_unused_cells(cptr->data.user.fifo->pool); 1816 } else { 1817 info.input_pool = 0; 1818 info.input_free = 0; 1819 } 1820 snd_seq_client_unlock(cptr); 1821 1822 if (copy_to_user(arg, &info, sizeof(info))) 1823 return -EFAULT; 1824 return 0; 1825 } 1826 1827 /* SET_CLIENT_POOL ioctl() */ 1828 static int snd_seq_ioctl_set_client_pool(client_t * client, void __user *arg) 1829 { 1830 snd_seq_client_pool_t info; 1831 int rc; 1832 1833 if (copy_from_user(&info, arg, sizeof(info))) 1834 return -EFAULT; 1835 1836 if (client->number != info.client) 1837 return -EINVAL; /* can't change other clients */ 1838 1839 if (info.output_pool >= 1 && info.output_pool <= SNDRV_SEQ_MAX_EVENTS && 1840 (! snd_seq_write_pool_allocated(client) || 1841 info.output_pool != client->pool->size)) { 1842 if (snd_seq_write_pool_allocated(client)) { 1843 /* remove all existing cells */ 1844 snd_seq_queue_client_leave_cells(client->number); 1845 snd_seq_pool_done(client->pool); 1846 } 1847 client->pool->size = info.output_pool; 1848 rc = snd_seq_pool_init(client->pool); 1849 if (rc < 0) 1850 return rc; 1851 } 1852 if (client->type == USER_CLIENT && client->data.user.fifo != NULL && 1853 info.input_pool >= 1 && 1854 info.input_pool <= SNDRV_SEQ_MAX_CLIENT_EVENTS && 1855 info.input_pool != client->data.user.fifo_pool_size) { 1856 /* change pool size */ 1857 rc = snd_seq_fifo_resize(client->data.user.fifo, info.input_pool); 1858 if (rc < 0) 1859 return rc; 1860 client->data.user.fifo_pool_size = info.input_pool; 1861 } 1862 if (info.output_room >= 1 && 1863 info.output_room <= client->pool->size) { 1864 client->pool->room = info.output_room; 1865 } 1866 1867 return snd_seq_ioctl_get_client_pool(client, arg); 1868 } 1869 1870 1871 /* REMOVE_EVENTS ioctl() */ 1872 static int snd_seq_ioctl_remove_events(client_t * client, void __user *arg) 1873 { 1874 snd_seq_remove_events_t info; 1875 1876 if (copy_from_user(&info, arg, sizeof(info))) 1877 return -EFAULT; 1878 1879 /* 1880 * Input mostly not implemented XXX. 1881 */ 1882 if (info.remove_mode & SNDRV_SEQ_REMOVE_INPUT) { 1883 /* 1884 * No restrictions so for a user client we can clear 1885 * the whole fifo 1886 */ 1887 if (client->type == USER_CLIENT) 1888 snd_seq_fifo_clear(client->data.user.fifo); 1889 } 1890 1891 if (info.remove_mode & SNDRV_SEQ_REMOVE_OUTPUT) 1892 snd_seq_queue_remove_cells(client->number, &info); 1893 1894 return 0; 1895 } 1896 1897 1898 /* 1899 * get subscription info 1900 */ 1901 static int snd_seq_ioctl_get_subscription(client_t *client, void __user *arg) 1902 { 1903 int result; 1904 client_t *sender = NULL; 1905 client_port_t *sport = NULL; 1906 snd_seq_port_subscribe_t subs; 1907 subscribers_t *p; 1908 1909 if (copy_from_user(&subs, arg, sizeof(subs))) 1910 return -EFAULT; 1911 1912 result = -EINVAL; 1913 if ((sender = snd_seq_client_use_ptr(subs.sender.client)) == NULL) 1914 goto __end; 1915 if ((sport = snd_seq_port_use_ptr(sender, subs.sender.port)) == NULL) 1916 goto __end; 1917 p = snd_seq_port_get_subscription(&sport->c_src, &subs.dest); 1918 if (p) { 1919 result = 0; 1920 subs = p->info; 1921 } else 1922 result = -ENOENT; 1923 1924 __end: 1925 if (sport) 1926 snd_seq_port_unlock(sport); 1927 if (sender) 1928 snd_seq_client_unlock(sender); 1929 if (result >= 0) { 1930 if (copy_to_user(arg, &subs, sizeof(subs))) 1931 return -EFAULT; 1932 } 1933 return result; 1934 } 1935 1936 1937 /* 1938 * get subscription info - check only its presence 1939 */ 1940 static int snd_seq_ioctl_query_subs(client_t *client, void __user *arg) 1941 { 1942 int result = -ENXIO; 1943 client_t *cptr = NULL; 1944 client_port_t *port = NULL; 1945 snd_seq_query_subs_t subs; 1946 port_subs_info_t *group; 1947 struct list_head *p; 1948 int i; 1949 1950 if (copy_from_user(&subs, arg, sizeof(subs))) 1951 return -EFAULT; 1952 1953 if ((cptr = snd_seq_client_use_ptr(subs.root.client)) == NULL) 1954 goto __end; 1955 if ((port = snd_seq_port_use_ptr(cptr, subs.root.port)) == NULL) 1956 goto __end; 1957 1958 switch (subs.type) { 1959 case SNDRV_SEQ_QUERY_SUBS_READ: 1960 group = &port->c_src; 1961 break; 1962 case SNDRV_SEQ_QUERY_SUBS_WRITE: 1963 group = &port->c_dest; 1964 break; 1965 default: 1966 goto __end; 1967 } 1968 1969 down_read(&group->list_mutex); 1970 /* search for the subscriber */ 1971 subs.num_subs = group->count; 1972 i = 0; 1973 result = -ENOENT; 1974 list_for_each(p, &group->list_head) { 1975 if (i++ == subs.index) { 1976 /* found! */ 1977 subscribers_t *s; 1978 if (subs.type == SNDRV_SEQ_QUERY_SUBS_READ) { 1979 s = list_entry(p, subscribers_t, src_list); 1980 subs.addr = s->info.dest; 1981 } else { 1982 s = list_entry(p, subscribers_t, dest_list); 1983 subs.addr = s->info.sender; 1984 } 1985 subs.flags = s->info.flags; 1986 subs.queue = s->info.queue; 1987 result = 0; 1988 break; 1989 } 1990 } 1991 up_read(&group->list_mutex); 1992 1993 __end: 1994 if (port) 1995 snd_seq_port_unlock(port); 1996 if (cptr) 1997 snd_seq_client_unlock(cptr); 1998 if (result >= 0) { 1999 if (copy_to_user(arg, &subs, sizeof(subs))) 2000 return -EFAULT; 2001 } 2002 return result; 2003 } 2004 2005 2006 /* 2007 * query next client 2008 */ 2009 static int snd_seq_ioctl_query_next_client(client_t *client, void __user *arg) 2010 { 2011 client_t *cptr = NULL; 2012 snd_seq_client_info_t info; 2013 2014 if (copy_from_user(&info, arg, sizeof(info))) 2015 return -EFAULT; 2016 2017 /* search for next client */ 2018 info.client++; 2019 if (info.client < 0) 2020 info.client = 0; 2021 for (; info.client < SNDRV_SEQ_MAX_CLIENTS; info.client++) { 2022 cptr = snd_seq_client_use_ptr(info.client); 2023 if (cptr) 2024 break; /* found */ 2025 } 2026 if (cptr == NULL) 2027 return -ENOENT; 2028 2029 get_client_info(cptr, &info); 2030 snd_seq_client_unlock(cptr); 2031 2032 if (copy_to_user(arg, &info, sizeof(info))) 2033 return -EFAULT; 2034 return 0; 2035 } 2036 2037 /* 2038 * query next port 2039 */ 2040 static int snd_seq_ioctl_query_next_port(client_t *client, void __user *arg) 2041 { 2042 client_t *cptr; 2043 client_port_t *port = NULL; 2044 snd_seq_port_info_t info; 2045 2046 if (copy_from_user(&info, arg, sizeof(info))) 2047 return -EFAULT; 2048 cptr = snd_seq_client_use_ptr(info.addr.client); 2049 if (cptr == NULL) 2050 return -ENXIO; 2051 2052 /* search for next port */ 2053 info.addr.port++; 2054 port = snd_seq_port_query_nearest(cptr, &info); 2055 if (port == NULL) { 2056 snd_seq_client_unlock(cptr); 2057 return -ENOENT; 2058 } 2059 2060 /* get port info */ 2061 info.addr = port->addr; 2062 snd_seq_get_port_info(port, &info); 2063 snd_seq_port_unlock(port); 2064 snd_seq_client_unlock(cptr); 2065 2066 if (copy_to_user(arg, &info, sizeof(info))) 2067 return -EFAULT; 2068 return 0; 2069 } 2070 2071 /* -------------------------------------------------------- */ 2072 2073 static struct seq_ioctl_table { 2074 unsigned int cmd; 2075 int (*func)(client_t *client, void __user * arg); 2076 } ioctl_tables[] = { 2077 { SNDRV_SEQ_IOCTL_SYSTEM_INFO, snd_seq_ioctl_system_info }, 2078 { SNDRV_SEQ_IOCTL_RUNNING_MODE, snd_seq_ioctl_running_mode }, 2079 { SNDRV_SEQ_IOCTL_GET_CLIENT_INFO, snd_seq_ioctl_get_client_info }, 2080 { SNDRV_SEQ_IOCTL_SET_CLIENT_INFO, snd_seq_ioctl_set_client_info }, 2081 { SNDRV_SEQ_IOCTL_CREATE_PORT, snd_seq_ioctl_create_port }, 2082 { SNDRV_SEQ_IOCTL_DELETE_PORT, snd_seq_ioctl_delete_port }, 2083 { SNDRV_SEQ_IOCTL_GET_PORT_INFO, snd_seq_ioctl_get_port_info }, 2084 { SNDRV_SEQ_IOCTL_SET_PORT_INFO, snd_seq_ioctl_set_port_info }, 2085 { SNDRV_SEQ_IOCTL_SUBSCRIBE_PORT, snd_seq_ioctl_subscribe_port }, 2086 { SNDRV_SEQ_IOCTL_UNSUBSCRIBE_PORT, snd_seq_ioctl_unsubscribe_port }, 2087 { SNDRV_SEQ_IOCTL_CREATE_QUEUE, snd_seq_ioctl_create_queue }, 2088 { SNDRV_SEQ_IOCTL_DELETE_QUEUE, snd_seq_ioctl_delete_queue }, 2089 { SNDRV_SEQ_IOCTL_GET_QUEUE_INFO, snd_seq_ioctl_get_queue_info }, 2090 { SNDRV_SEQ_IOCTL_SET_QUEUE_INFO, snd_seq_ioctl_set_queue_info }, 2091 { SNDRV_SEQ_IOCTL_GET_NAMED_QUEUE, snd_seq_ioctl_get_named_queue }, 2092 { SNDRV_SEQ_IOCTL_GET_QUEUE_STATUS, snd_seq_ioctl_get_queue_status }, 2093 { SNDRV_SEQ_IOCTL_GET_QUEUE_TEMPO, snd_seq_ioctl_get_queue_tempo }, 2094 { SNDRV_SEQ_IOCTL_SET_QUEUE_TEMPO, snd_seq_ioctl_set_queue_tempo }, 2095 { SNDRV_SEQ_IOCTL_GET_QUEUE_TIMER, snd_seq_ioctl_get_queue_timer }, 2096 { SNDRV_SEQ_IOCTL_SET_QUEUE_TIMER, snd_seq_ioctl_set_queue_timer }, 2097 { SNDRV_SEQ_IOCTL_GET_QUEUE_CLIENT, snd_seq_ioctl_get_queue_client }, 2098 { SNDRV_SEQ_IOCTL_SET_QUEUE_CLIENT, snd_seq_ioctl_set_queue_client }, 2099 { SNDRV_SEQ_IOCTL_GET_CLIENT_POOL, snd_seq_ioctl_get_client_pool }, 2100 { SNDRV_SEQ_IOCTL_SET_CLIENT_POOL, snd_seq_ioctl_set_client_pool }, 2101 { SNDRV_SEQ_IOCTL_GET_SUBSCRIPTION, snd_seq_ioctl_get_subscription }, 2102 { SNDRV_SEQ_IOCTL_QUERY_NEXT_CLIENT, snd_seq_ioctl_query_next_client }, 2103 { SNDRV_SEQ_IOCTL_QUERY_NEXT_PORT, snd_seq_ioctl_query_next_port }, 2104 { SNDRV_SEQ_IOCTL_REMOVE_EVENTS, snd_seq_ioctl_remove_events }, 2105 { SNDRV_SEQ_IOCTL_QUERY_SUBS, snd_seq_ioctl_query_subs }, 2106 { 0, NULL }, 2107 }; 2108 2109 static int snd_seq_do_ioctl(client_t *client, unsigned int cmd, void __user *arg) 2110 { 2111 struct seq_ioctl_table *p; 2112 2113 switch (cmd) { 2114 case SNDRV_SEQ_IOCTL_PVERSION: 2115 /* return sequencer version number */ 2116 return put_user(SNDRV_SEQ_VERSION, (int __user *)arg) ? -EFAULT : 0; 2117 case SNDRV_SEQ_IOCTL_CLIENT_ID: 2118 /* return the id of this client */ 2119 return put_user(client->number, (int __user *)arg) ? -EFAULT : 0; 2120 } 2121 2122 if (! arg) 2123 return -EFAULT; 2124 for (p = ioctl_tables; p->cmd; p++) { 2125 if (p->cmd == cmd) 2126 return p->func(client, arg); 2127 } 2128 snd_printd("seq unknown ioctl() 0x%x (type='%c', number=0x%2x)\n", 2129 cmd, _IOC_TYPE(cmd), _IOC_NR(cmd)); 2130 return -ENOTTY; 2131 } 2132 2133 2134 static long snd_seq_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 2135 { 2136 client_t *client = (client_t *) file->private_data; 2137 2138 snd_assert(client != NULL, return -ENXIO); 2139 2140 return snd_seq_do_ioctl(client, cmd, (void __user *) arg); 2141 } 2142 2143 #ifdef CONFIG_COMPAT 2144 #include "seq_compat.c" 2145 #else 2146 #define snd_seq_ioctl_compat NULL 2147 #endif 2148 2149 /* -------------------------------------------------------- */ 2150 2151 2152 /* exported to kernel modules */ 2153 int snd_seq_create_kernel_client(snd_card_t *card, int client_index, snd_seq_client_callback_t * callback) 2154 { 2155 client_t *client; 2156 2157 snd_assert(! in_interrupt(), return -EBUSY); 2158 2159 if (callback == NULL) 2160 return -EINVAL; 2161 if (card && client_index > 7) 2162 return -EINVAL; 2163 if (card == NULL && client_index > 63) 2164 return -EINVAL; 2165 if (card) 2166 client_index += 64 + (card->number << 3); 2167 2168 if (down_interruptible(®ister_mutex)) 2169 return -ERESTARTSYS; 2170 /* empty write queue as default */ 2171 client = seq_create_client1(client_index, 0); 2172 if (client == NULL) { 2173 up(®ister_mutex); 2174 return -EBUSY; /* failure code */ 2175 } 2176 usage_alloc(&client_usage, 1); 2177 2178 client->accept_input = callback->allow_output; 2179 client->accept_output = callback->allow_input; 2180 2181 /* fill client data */ 2182 client->data.kernel.card = card; 2183 client->data.kernel.private_data = callback->private_data; 2184 sprintf(client->name, "Client-%d", client->number); 2185 2186 client->type = KERNEL_CLIENT; 2187 up(®ister_mutex); 2188 2189 /* make others aware this new client */ 2190 snd_seq_system_client_ev_client_start(client->number); 2191 2192 /* return client number to caller */ 2193 return client->number; 2194 } 2195 2196 /* exported to kernel modules */ 2197 int snd_seq_delete_kernel_client(int client) 2198 { 2199 client_t *ptr; 2200 2201 snd_assert(! in_interrupt(), return -EBUSY); 2202 2203 ptr = clientptr(client); 2204 if (ptr == NULL) 2205 return -EINVAL; 2206 2207 seq_free_client(ptr); 2208 kfree(ptr); 2209 return 0; 2210 } 2211 2212 2213 /* skeleton to enqueue event, called from snd_seq_kernel_client_enqueue 2214 * and snd_seq_kernel_client_enqueue_blocking 2215 */ 2216 static int kernel_client_enqueue(int client, snd_seq_event_t *ev, 2217 struct file *file, int blocking, 2218 int atomic, int hop) 2219 { 2220 client_t *cptr; 2221 int result; 2222 2223 snd_assert(ev != NULL, return -EINVAL); 2224 2225 if (ev->type == SNDRV_SEQ_EVENT_NONE) 2226 return 0; /* ignore this */ 2227 if (ev->type == SNDRV_SEQ_EVENT_KERNEL_ERROR) 2228 return -EINVAL; /* quoted events can't be enqueued */ 2229 2230 /* fill in client number */ 2231 ev->source.client = client; 2232 2233 if (check_event_type_and_length(ev)) 2234 return -EINVAL; 2235 2236 cptr = snd_seq_client_use_ptr(client); 2237 if (cptr == NULL) 2238 return -EINVAL; 2239 2240 if (! cptr->accept_output) 2241 result = -EPERM; 2242 else /* send it */ 2243 result = snd_seq_client_enqueue_event(cptr, ev, file, blocking, atomic, hop); 2244 2245 snd_seq_client_unlock(cptr); 2246 return result; 2247 } 2248 2249 /* 2250 * exported, called by kernel clients to enqueue events (w/o blocking) 2251 * 2252 * RETURN VALUE: zero if succeed, negative if error 2253 */ 2254 int snd_seq_kernel_client_enqueue(int client, snd_seq_event_t * ev, 2255 int atomic, int hop) 2256 { 2257 return kernel_client_enqueue(client, ev, NULL, 0, atomic, hop); 2258 } 2259 2260 /* 2261 * exported, called by kernel clients to enqueue events (with blocking) 2262 * 2263 * RETURN VALUE: zero if succeed, negative if error 2264 */ 2265 int snd_seq_kernel_client_enqueue_blocking(int client, snd_seq_event_t * ev, 2266 struct file *file, 2267 int atomic, int hop) 2268 { 2269 return kernel_client_enqueue(client, ev, file, 1, atomic, hop); 2270 } 2271 2272 2273 /* 2274 * exported, called by kernel clients to dispatch events directly to other 2275 * clients, bypassing the queues. Event time-stamp will be updated. 2276 * 2277 * RETURN VALUE: negative = delivery failed, 2278 * zero, or positive: the number of delivered events 2279 */ 2280 int snd_seq_kernel_client_dispatch(int client, snd_seq_event_t * ev, 2281 int atomic, int hop) 2282 { 2283 client_t *cptr; 2284 int result; 2285 2286 snd_assert(ev != NULL, return -EINVAL); 2287 2288 /* fill in client number */ 2289 ev->queue = SNDRV_SEQ_QUEUE_DIRECT; 2290 ev->source.client = client; 2291 2292 if (check_event_type_and_length(ev)) 2293 return -EINVAL; 2294 2295 cptr = snd_seq_client_use_ptr(client); 2296 if (cptr == NULL) 2297 return -EINVAL; 2298 2299 if (!cptr->accept_output) 2300 result = -EPERM; 2301 else 2302 result = snd_seq_deliver_event(cptr, ev, atomic, hop); 2303 2304 snd_seq_client_unlock(cptr); 2305 return result; 2306 } 2307 2308 2309 /* 2310 * exported, called by kernel clients to perform same functions as with 2311 * userland ioctl() 2312 */ 2313 int snd_seq_kernel_client_ctl(int clientid, unsigned int cmd, void *arg) 2314 { 2315 client_t *client; 2316 mm_segment_t fs; 2317 int result; 2318 2319 client = clientptr(clientid); 2320 if (client == NULL) 2321 return -ENXIO; 2322 fs = snd_enter_user(); 2323 result = snd_seq_do_ioctl(client, cmd, (void __user *)arg); 2324 snd_leave_user(fs); 2325 return result; 2326 } 2327 2328 2329 /* exported (for OSS emulator) */ 2330 int snd_seq_kernel_client_write_poll(int clientid, struct file *file, poll_table *wait) 2331 { 2332 client_t *client; 2333 2334 client = clientptr(clientid); 2335 if (client == NULL) 2336 return -ENXIO; 2337 2338 if (! snd_seq_write_pool_allocated(client)) 2339 return 1; 2340 if (snd_seq_pool_poll_wait(client->pool, file, wait)) 2341 return 1; 2342 return 0; 2343 } 2344 2345 /*---------------------------------------------------------------------------*/ 2346 2347 /* 2348 * /proc interface 2349 */ 2350 static void snd_seq_info_dump_subscribers(snd_info_buffer_t *buffer, port_subs_info_t *group, int is_src, char *msg) 2351 { 2352 struct list_head *p; 2353 subscribers_t *s; 2354 int count = 0; 2355 2356 down_read(&group->list_mutex); 2357 if (list_empty(&group->list_head)) { 2358 up_read(&group->list_mutex); 2359 return; 2360 } 2361 snd_iprintf(buffer, msg); 2362 list_for_each(p, &group->list_head) { 2363 if (is_src) 2364 s = list_entry(p, subscribers_t, src_list); 2365 else 2366 s = list_entry(p, subscribers_t, dest_list); 2367 if (count++) 2368 snd_iprintf(buffer, ", "); 2369 snd_iprintf(buffer, "%d:%d", 2370 is_src ? s->info.dest.client : s->info.sender.client, 2371 is_src ? s->info.dest.port : s->info.sender.port); 2372 if (s->info.flags & SNDRV_SEQ_PORT_SUBS_TIMESTAMP) 2373 snd_iprintf(buffer, "[%c:%d]", ((s->info.flags & SNDRV_SEQ_PORT_SUBS_TIME_REAL) ? 'r' : 't'), s->info.queue); 2374 if (group->exclusive) 2375 snd_iprintf(buffer, "[ex]"); 2376 } 2377 up_read(&group->list_mutex); 2378 snd_iprintf(buffer, "\n"); 2379 } 2380 2381 #define FLAG_PERM_RD(perm) ((perm) & SNDRV_SEQ_PORT_CAP_READ ? ((perm) & SNDRV_SEQ_PORT_CAP_SUBS_READ ? 'R' : 'r') : '-') 2382 #define FLAG_PERM_WR(perm) ((perm) & SNDRV_SEQ_PORT_CAP_WRITE ? ((perm) & SNDRV_SEQ_PORT_CAP_SUBS_WRITE ? 'W' : 'w') : '-') 2383 #define FLAG_PERM_EX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_NO_EXPORT ? '-' : 'e') 2384 2385 #define FLAG_PERM_DUPLEX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_DUPLEX ? 'X' : '-') 2386 2387 static void snd_seq_info_dump_ports(snd_info_buffer_t *buffer, client_t *client) 2388 { 2389 struct list_head *l; 2390 2391 down(&client->ports_mutex); 2392 list_for_each(l, &client->ports_list_head) { 2393 client_port_t *p = list_entry(l, client_port_t, list); 2394 snd_iprintf(buffer, " Port %3d : \"%s\" (%c%c%c%c)\n", 2395 p->addr.port, p->name, 2396 FLAG_PERM_RD(p->capability), 2397 FLAG_PERM_WR(p->capability), 2398 FLAG_PERM_EX(p->capability), 2399 FLAG_PERM_DUPLEX(p->capability)); 2400 snd_seq_info_dump_subscribers(buffer, &p->c_src, 1, " Connecting To: "); 2401 snd_seq_info_dump_subscribers(buffer, &p->c_dest, 0, " Connected From: "); 2402 } 2403 up(&client->ports_mutex); 2404 } 2405 2406 2407 /* exported to seq_info.c */ 2408 void snd_seq_info_clients_read(snd_info_entry_t *entry, 2409 snd_info_buffer_t * buffer) 2410 { 2411 extern void snd_seq_info_pool(snd_info_buffer_t * buffer, pool_t * pool, char *space); 2412 int c; 2413 client_t *client; 2414 2415 snd_iprintf(buffer, "Client info\n"); 2416 snd_iprintf(buffer, " cur clients : %d\n", client_usage.cur); 2417 snd_iprintf(buffer, " peak clients : %d\n", client_usage.peak); 2418 snd_iprintf(buffer, " max clients : %d\n", SNDRV_SEQ_MAX_CLIENTS); 2419 snd_iprintf(buffer, "\n"); 2420 2421 /* list the client table */ 2422 for (c = 0; c < SNDRV_SEQ_MAX_CLIENTS; c++) { 2423 client = snd_seq_client_use_ptr(c); 2424 if (client == NULL) 2425 continue; 2426 if (client->type == NO_CLIENT) { 2427 snd_seq_client_unlock(client); 2428 continue; 2429 } 2430 2431 snd_iprintf(buffer, "Client %3d : \"%s\" [%s]\n", 2432 c, client->name, 2433 client->type == USER_CLIENT ? "User" : "Kernel"); 2434 snd_seq_info_dump_ports(buffer, client); 2435 if (snd_seq_write_pool_allocated(client)) { 2436 snd_iprintf(buffer, " Output pool :\n"); 2437 snd_seq_info_pool(buffer, client->pool, " "); 2438 } 2439 if (client->type == USER_CLIENT && client->data.user.fifo && 2440 client->data.user.fifo->pool) { 2441 snd_iprintf(buffer, " Input pool :\n"); 2442 snd_seq_info_pool(buffer, client->data.user.fifo->pool, " "); 2443 } 2444 snd_seq_client_unlock(client); 2445 } 2446 } 2447 2448 2449 /*---------------------------------------------------------------------------*/ 2450 2451 2452 /* 2453 * REGISTRATION PART 2454 */ 2455 2456 static struct file_operations snd_seq_f_ops = 2457 { 2458 .owner = THIS_MODULE, 2459 .read = snd_seq_read, 2460 .write = snd_seq_write, 2461 .open = snd_seq_open, 2462 .release = snd_seq_release, 2463 .poll = snd_seq_poll, 2464 .unlocked_ioctl = snd_seq_ioctl, 2465 .compat_ioctl = snd_seq_ioctl_compat, 2466 }; 2467 2468 static snd_minor_t snd_seq_reg = 2469 { 2470 .comment = "sequencer", 2471 .f_ops = &snd_seq_f_ops, 2472 }; 2473 2474 2475 /* 2476 * register sequencer device 2477 */ 2478 int __init snd_sequencer_device_init(void) 2479 { 2480 int err; 2481 2482 if (down_interruptible(®ister_mutex)) 2483 return -ERESTARTSYS; 2484 2485 if ((err = snd_register_device(SNDRV_DEVICE_TYPE_SEQUENCER, NULL, 0, &snd_seq_reg, "seq")) < 0) { 2486 up(®ister_mutex); 2487 return err; 2488 } 2489 2490 up(®ister_mutex); 2491 2492 return 0; 2493 } 2494 2495 2496 2497 /* 2498 * unregister sequencer device 2499 */ 2500 void __exit snd_sequencer_device_done(void) 2501 { 2502 snd_unregister_device(SNDRV_DEVICE_TYPE_SEQUENCER, NULL, 0); 2503 } 2504