1 /* 2 * ALSA sequencer Client Manager 3 * Copyright (c) 1998-2001 by Frank van de Pol <fvdpol@coil.demon.nl> 4 * Jaroslav Kysela <perex@perex.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 <linux/init.h> 25 #include <linux/export.h> 26 #include <linux/slab.h> 27 #include <sound/core.h> 28 #include <sound/minors.h> 29 #include <linux/kmod.h> 30 31 #include <sound/seq_kernel.h> 32 #include "seq_clientmgr.h" 33 #include "seq_memory.h" 34 #include "seq_queue.h" 35 #include "seq_timer.h" 36 #include "seq_info.h" 37 #include "seq_system.h" 38 #include <sound/seq_device.h> 39 #ifdef CONFIG_COMPAT 40 #include <linux/compat.h> 41 #endif 42 43 /* Client Manager 44 45 * this module handles the connections of userland and kernel clients 46 * 47 */ 48 49 /* 50 * There are four ranges of client numbers (last two shared): 51 * 0..15: global clients 52 * 16..127: statically allocated client numbers for cards 0..27 53 * 128..191: dynamically allocated client numbers for cards 28..31 54 * 128..191: dynamically allocated client numbers for applications 55 */ 56 57 /* number of kernel non-card clients */ 58 #define SNDRV_SEQ_GLOBAL_CLIENTS 16 59 /* clients per cards, for static clients */ 60 #define SNDRV_SEQ_CLIENTS_PER_CARD 4 61 /* dynamically allocated client numbers (both kernel drivers and user space) */ 62 #define SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN 128 63 64 #define SNDRV_SEQ_LFLG_INPUT 0x0001 65 #define SNDRV_SEQ_LFLG_OUTPUT 0x0002 66 #define SNDRV_SEQ_LFLG_OPEN (SNDRV_SEQ_LFLG_INPUT|SNDRV_SEQ_LFLG_OUTPUT) 67 68 static DEFINE_SPINLOCK(clients_lock); 69 static DEFINE_MUTEX(register_mutex); 70 71 /* 72 * client table 73 */ 74 static char clienttablock[SNDRV_SEQ_MAX_CLIENTS]; 75 static struct snd_seq_client *clienttab[SNDRV_SEQ_MAX_CLIENTS]; 76 static struct snd_seq_usage client_usage; 77 78 /* 79 * prototypes 80 */ 81 static int bounce_error_event(struct snd_seq_client *client, 82 struct snd_seq_event *event, 83 int err, int atomic, int hop); 84 static int snd_seq_deliver_single_event(struct snd_seq_client *client, 85 struct snd_seq_event *event, 86 int filter, int atomic, int hop); 87 88 /* 89 */ 90 static inline unsigned short snd_seq_file_flags(struct file *file) 91 { 92 switch (file->f_mode & (FMODE_READ | FMODE_WRITE)) { 93 case FMODE_WRITE: 94 return SNDRV_SEQ_LFLG_OUTPUT; 95 case FMODE_READ: 96 return SNDRV_SEQ_LFLG_INPUT; 97 default: 98 return SNDRV_SEQ_LFLG_OPEN; 99 } 100 } 101 102 static inline int snd_seq_write_pool_allocated(struct snd_seq_client *client) 103 { 104 return snd_seq_total_cells(client->pool) > 0; 105 } 106 107 /* return pointer to client structure for specified id */ 108 static struct snd_seq_client *clientptr(int clientid) 109 { 110 if (clientid < 0 || clientid >= SNDRV_SEQ_MAX_CLIENTS) { 111 pr_debug("ALSA: seq: oops. Trying to get pointer to client %d\n", 112 clientid); 113 return NULL; 114 } 115 return clienttab[clientid]; 116 } 117 118 struct snd_seq_client *snd_seq_client_use_ptr(int clientid) 119 { 120 unsigned long flags; 121 struct snd_seq_client *client; 122 123 if (clientid < 0 || clientid >= SNDRV_SEQ_MAX_CLIENTS) { 124 pr_debug("ALSA: seq: oops. Trying to get pointer to client %d\n", 125 clientid); 126 return NULL; 127 } 128 spin_lock_irqsave(&clients_lock, flags); 129 client = clientptr(clientid); 130 if (client) 131 goto __lock; 132 if (clienttablock[clientid]) { 133 spin_unlock_irqrestore(&clients_lock, flags); 134 return NULL; 135 } 136 spin_unlock_irqrestore(&clients_lock, flags); 137 #ifdef CONFIG_MODULES 138 if (!in_interrupt()) { 139 static char client_requested[SNDRV_SEQ_GLOBAL_CLIENTS]; 140 static char card_requested[SNDRV_CARDS]; 141 if (clientid < SNDRV_SEQ_GLOBAL_CLIENTS) { 142 int idx; 143 144 if (!client_requested[clientid]) { 145 client_requested[clientid] = 1; 146 for (idx = 0; idx < 15; idx++) { 147 if (seq_client_load[idx] < 0) 148 break; 149 if (seq_client_load[idx] == clientid) { 150 request_module("snd-seq-client-%i", 151 clientid); 152 break; 153 } 154 } 155 } 156 } else if (clientid < SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN) { 157 int card = (clientid - SNDRV_SEQ_GLOBAL_CLIENTS) / 158 SNDRV_SEQ_CLIENTS_PER_CARD; 159 if (card < snd_ecards_limit) { 160 if (! card_requested[card]) { 161 card_requested[card] = 1; 162 snd_request_card(card); 163 } 164 snd_seq_device_load_drivers(); 165 } 166 } 167 spin_lock_irqsave(&clients_lock, flags); 168 client = clientptr(clientid); 169 if (client) 170 goto __lock; 171 spin_unlock_irqrestore(&clients_lock, flags); 172 } 173 #endif 174 return NULL; 175 176 __lock: 177 snd_use_lock_use(&client->use_lock); 178 spin_unlock_irqrestore(&clients_lock, flags); 179 return client; 180 } 181 182 static void usage_alloc(struct snd_seq_usage *res, int num) 183 { 184 res->cur += num; 185 if (res->cur > res->peak) 186 res->peak = res->cur; 187 } 188 189 static void usage_free(struct snd_seq_usage *res, int num) 190 { 191 res->cur -= num; 192 } 193 194 /* initialise data structures */ 195 int __init client_init_data(void) 196 { 197 /* zap out the client table */ 198 memset(&clienttablock, 0, sizeof(clienttablock)); 199 memset(&clienttab, 0, sizeof(clienttab)); 200 return 0; 201 } 202 203 204 static struct snd_seq_client *seq_create_client1(int client_index, int poolsize) 205 { 206 unsigned long flags; 207 int c; 208 struct snd_seq_client *client; 209 210 /* init client data */ 211 client = kzalloc(sizeof(*client), GFP_KERNEL); 212 if (client == NULL) 213 return NULL; 214 client->pool = snd_seq_pool_new(poolsize); 215 if (client->pool == NULL) { 216 kfree(client); 217 return NULL; 218 } 219 client->type = NO_CLIENT; 220 snd_use_lock_init(&client->use_lock); 221 rwlock_init(&client->ports_lock); 222 mutex_init(&client->ports_mutex); 223 INIT_LIST_HEAD(&client->ports_list_head); 224 mutex_init(&client->ioctl_mutex); 225 226 /* find free slot in the client table */ 227 spin_lock_irqsave(&clients_lock, flags); 228 if (client_index < 0) { 229 for (c = SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN; 230 c < SNDRV_SEQ_MAX_CLIENTS; 231 c++) { 232 if (clienttab[c] || clienttablock[c]) 233 continue; 234 clienttab[client->number = c] = client; 235 spin_unlock_irqrestore(&clients_lock, flags); 236 return client; 237 } 238 } else { 239 if (clienttab[client_index] == NULL && !clienttablock[client_index]) { 240 clienttab[client->number = client_index] = client; 241 spin_unlock_irqrestore(&clients_lock, flags); 242 return client; 243 } 244 } 245 spin_unlock_irqrestore(&clients_lock, flags); 246 snd_seq_pool_delete(&client->pool); 247 kfree(client); 248 return NULL; /* no free slot found or busy, return failure code */ 249 } 250 251 252 static int seq_free_client1(struct snd_seq_client *client) 253 { 254 unsigned long flags; 255 256 if (!client) 257 return 0; 258 spin_lock_irqsave(&clients_lock, flags); 259 clienttablock[client->number] = 1; 260 clienttab[client->number] = NULL; 261 spin_unlock_irqrestore(&clients_lock, flags); 262 snd_seq_delete_all_ports(client); 263 snd_seq_queue_client_leave(client->number); 264 snd_use_lock_sync(&client->use_lock); 265 snd_seq_queue_client_termination(client->number); 266 if (client->pool) 267 snd_seq_pool_delete(&client->pool); 268 spin_lock_irqsave(&clients_lock, flags); 269 clienttablock[client->number] = 0; 270 spin_unlock_irqrestore(&clients_lock, flags); 271 return 0; 272 } 273 274 275 static void seq_free_client(struct snd_seq_client * client) 276 { 277 mutex_lock(®ister_mutex); 278 switch (client->type) { 279 case NO_CLIENT: 280 pr_warn("ALSA: seq: Trying to free unused client %d\n", 281 client->number); 282 break; 283 case USER_CLIENT: 284 case KERNEL_CLIENT: 285 seq_free_client1(client); 286 usage_free(&client_usage, 1); 287 break; 288 289 default: 290 pr_err("ALSA: seq: Trying to free client %d with undefined type = %d\n", 291 client->number, client->type); 292 } 293 mutex_unlock(®ister_mutex); 294 295 snd_seq_system_client_ev_client_exit(client->number); 296 } 297 298 299 300 /* -------------------------------------------------------- */ 301 302 /* create a user client */ 303 static int snd_seq_open(struct inode *inode, struct file *file) 304 { 305 int c, mode; /* client id */ 306 struct snd_seq_client *client; 307 struct snd_seq_user_client *user; 308 int err; 309 310 err = nonseekable_open(inode, file); 311 if (err < 0) 312 return err; 313 314 mutex_lock(®ister_mutex); 315 client = seq_create_client1(-1, SNDRV_SEQ_DEFAULT_EVENTS); 316 if (!client) { 317 mutex_unlock(®ister_mutex); 318 return -ENOMEM; /* failure code */ 319 } 320 321 mode = snd_seq_file_flags(file); 322 if (mode & SNDRV_SEQ_LFLG_INPUT) 323 client->accept_input = 1; 324 if (mode & SNDRV_SEQ_LFLG_OUTPUT) 325 client->accept_output = 1; 326 327 user = &client->data.user; 328 user->fifo = NULL; 329 user->fifo_pool_size = 0; 330 331 if (mode & SNDRV_SEQ_LFLG_INPUT) { 332 user->fifo_pool_size = SNDRV_SEQ_DEFAULT_CLIENT_EVENTS; 333 user->fifo = snd_seq_fifo_new(user->fifo_pool_size); 334 if (user->fifo == NULL) { 335 seq_free_client1(client); 336 kfree(client); 337 mutex_unlock(®ister_mutex); 338 return -ENOMEM; 339 } 340 } 341 342 usage_alloc(&client_usage, 1); 343 client->type = USER_CLIENT; 344 mutex_unlock(®ister_mutex); 345 346 c = client->number; 347 file->private_data = client; 348 349 /* fill client data */ 350 user->file = file; 351 sprintf(client->name, "Client-%d", c); 352 client->data.user.owner = get_pid(task_pid(current)); 353 354 /* make others aware this new client */ 355 snd_seq_system_client_ev_client_start(c); 356 357 return 0; 358 } 359 360 /* delete a user client */ 361 static int snd_seq_release(struct inode *inode, struct file *file) 362 { 363 struct snd_seq_client *client = file->private_data; 364 365 if (client) { 366 seq_free_client(client); 367 if (client->data.user.fifo) 368 snd_seq_fifo_delete(&client->data.user.fifo); 369 put_pid(client->data.user.owner); 370 kfree(client); 371 } 372 373 return 0; 374 } 375 376 377 /* handle client read() */ 378 /* possible error values: 379 * -ENXIO invalid client or file open mode 380 * -ENOSPC FIFO overflow (the flag is cleared after this error report) 381 * -EINVAL no enough user-space buffer to write the whole event 382 * -EFAULT seg. fault during copy to user space 383 */ 384 static ssize_t snd_seq_read(struct file *file, char __user *buf, size_t count, 385 loff_t *offset) 386 { 387 struct snd_seq_client *client = file->private_data; 388 struct snd_seq_fifo *fifo; 389 int err; 390 long result = 0; 391 struct snd_seq_event_cell *cell; 392 393 if (!(snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_INPUT)) 394 return -ENXIO; 395 396 if (!access_ok(buf, count)) 397 return -EFAULT; 398 399 /* check client structures are in place */ 400 if (snd_BUG_ON(!client)) 401 return -ENXIO; 402 403 if (!client->accept_input || (fifo = client->data.user.fifo) == NULL) 404 return -ENXIO; 405 406 if (atomic_read(&fifo->overflow) > 0) { 407 /* buffer overflow is detected */ 408 snd_seq_fifo_clear(fifo); 409 /* return error code */ 410 return -ENOSPC; 411 } 412 413 cell = NULL; 414 err = 0; 415 snd_seq_fifo_lock(fifo); 416 417 /* while data available in queue */ 418 while (count >= sizeof(struct snd_seq_event)) { 419 int nonblock; 420 421 nonblock = (file->f_flags & O_NONBLOCK) || result > 0; 422 if ((err = snd_seq_fifo_cell_out(fifo, &cell, nonblock)) < 0) { 423 break; 424 } 425 if (snd_seq_ev_is_variable(&cell->event)) { 426 struct snd_seq_event tmpev; 427 tmpev = cell->event; 428 tmpev.data.ext.len &= ~SNDRV_SEQ_EXT_MASK; 429 if (copy_to_user(buf, &tmpev, sizeof(struct snd_seq_event))) { 430 err = -EFAULT; 431 break; 432 } 433 count -= sizeof(struct snd_seq_event); 434 buf += sizeof(struct snd_seq_event); 435 err = snd_seq_expand_var_event(&cell->event, count, 436 (char __force *)buf, 0, 437 sizeof(struct snd_seq_event)); 438 if (err < 0) 439 break; 440 result += err; 441 count -= err; 442 buf += err; 443 } else { 444 if (copy_to_user(buf, &cell->event, sizeof(struct snd_seq_event))) { 445 err = -EFAULT; 446 break; 447 } 448 count -= sizeof(struct snd_seq_event); 449 buf += sizeof(struct snd_seq_event); 450 } 451 snd_seq_cell_free(cell); 452 cell = NULL; /* to be sure */ 453 result += sizeof(struct snd_seq_event); 454 } 455 456 if (err < 0) { 457 if (cell) 458 snd_seq_fifo_cell_putback(fifo, cell); 459 if (err == -EAGAIN && result > 0) 460 err = 0; 461 } 462 snd_seq_fifo_unlock(fifo); 463 464 return (err < 0) ? err : result; 465 } 466 467 468 /* 469 * check access permission to the port 470 */ 471 static int check_port_perm(struct snd_seq_client_port *port, unsigned int flags) 472 { 473 if ((port->capability & flags) != flags) 474 return 0; 475 return flags; 476 } 477 478 /* 479 * check if the destination client is available, and return the pointer 480 * if filter is non-zero, client filter bitmap is tested. 481 */ 482 static struct snd_seq_client *get_event_dest_client(struct snd_seq_event *event, 483 int filter) 484 { 485 struct snd_seq_client *dest; 486 487 dest = snd_seq_client_use_ptr(event->dest.client); 488 if (dest == NULL) 489 return NULL; 490 if (! dest->accept_input) 491 goto __not_avail; 492 if ((dest->filter & SNDRV_SEQ_FILTER_USE_EVENT) && 493 ! test_bit(event->type, dest->event_filter)) 494 goto __not_avail; 495 if (filter && !(dest->filter & filter)) 496 goto __not_avail; 497 498 return dest; /* ok - accessible */ 499 __not_avail: 500 snd_seq_client_unlock(dest); 501 return NULL; 502 } 503 504 505 /* 506 * Return the error event. 507 * 508 * If the receiver client is a user client, the original event is 509 * encapsulated in SNDRV_SEQ_EVENT_BOUNCE as variable length event. If 510 * the original event is also variable length, the external data is 511 * copied after the event record. 512 * If the receiver client is a kernel client, the original event is 513 * quoted in SNDRV_SEQ_EVENT_KERNEL_ERROR, since this requires no extra 514 * kmalloc. 515 */ 516 static int bounce_error_event(struct snd_seq_client *client, 517 struct snd_seq_event *event, 518 int err, int atomic, int hop) 519 { 520 struct snd_seq_event bounce_ev; 521 int result; 522 523 if (client == NULL || 524 ! (client->filter & SNDRV_SEQ_FILTER_BOUNCE) || 525 ! client->accept_input) 526 return 0; /* ignored */ 527 528 /* set up quoted error */ 529 memset(&bounce_ev, 0, sizeof(bounce_ev)); 530 bounce_ev.type = SNDRV_SEQ_EVENT_KERNEL_ERROR; 531 bounce_ev.flags = SNDRV_SEQ_EVENT_LENGTH_FIXED; 532 bounce_ev.queue = SNDRV_SEQ_QUEUE_DIRECT; 533 bounce_ev.source.client = SNDRV_SEQ_CLIENT_SYSTEM; 534 bounce_ev.source.port = SNDRV_SEQ_PORT_SYSTEM_ANNOUNCE; 535 bounce_ev.dest.client = client->number; 536 bounce_ev.dest.port = event->source.port; 537 bounce_ev.data.quote.origin = event->dest; 538 bounce_ev.data.quote.event = event; 539 bounce_ev.data.quote.value = -err; /* use positive value */ 540 result = snd_seq_deliver_single_event(NULL, &bounce_ev, 0, atomic, hop + 1); 541 if (result < 0) { 542 client->event_lost++; 543 return result; 544 } 545 546 return result; 547 } 548 549 550 /* 551 * rewrite the time-stamp of the event record with the curren time 552 * of the given queue. 553 * return non-zero if updated. 554 */ 555 static int update_timestamp_of_queue(struct snd_seq_event *event, 556 int queue, int real_time) 557 { 558 struct snd_seq_queue *q; 559 560 q = queueptr(queue); 561 if (! q) 562 return 0; 563 event->queue = queue; 564 event->flags &= ~SNDRV_SEQ_TIME_STAMP_MASK; 565 if (real_time) { 566 event->time.time = snd_seq_timer_get_cur_time(q->timer); 567 event->flags |= SNDRV_SEQ_TIME_STAMP_REAL; 568 } else { 569 event->time.tick = snd_seq_timer_get_cur_tick(q->timer); 570 event->flags |= SNDRV_SEQ_TIME_STAMP_TICK; 571 } 572 queuefree(q); 573 return 1; 574 } 575 576 577 /* 578 * deliver an event to the specified destination. 579 * if filter is non-zero, client filter bitmap is tested. 580 * 581 * RETURN VALUE: 0 : if succeeded 582 * <0 : error 583 */ 584 static int snd_seq_deliver_single_event(struct snd_seq_client *client, 585 struct snd_seq_event *event, 586 int filter, int atomic, int hop) 587 { 588 struct snd_seq_client *dest = NULL; 589 struct snd_seq_client_port *dest_port = NULL; 590 int result = -ENOENT; 591 int direct; 592 593 direct = snd_seq_ev_is_direct(event); 594 595 dest = get_event_dest_client(event, filter); 596 if (dest == NULL) 597 goto __skip; 598 dest_port = snd_seq_port_use_ptr(dest, event->dest.port); 599 if (dest_port == NULL) 600 goto __skip; 601 602 /* check permission */ 603 if (! check_port_perm(dest_port, SNDRV_SEQ_PORT_CAP_WRITE)) { 604 result = -EPERM; 605 goto __skip; 606 } 607 608 if (dest_port->timestamping) 609 update_timestamp_of_queue(event, dest_port->time_queue, 610 dest_port->time_real); 611 612 switch (dest->type) { 613 case USER_CLIENT: 614 if (dest->data.user.fifo) 615 result = snd_seq_fifo_event_in(dest->data.user.fifo, event); 616 break; 617 618 case KERNEL_CLIENT: 619 if (dest_port->event_input == NULL) 620 break; 621 result = dest_port->event_input(event, direct, 622 dest_port->private_data, 623 atomic, hop); 624 break; 625 default: 626 break; 627 } 628 629 __skip: 630 if (dest_port) 631 snd_seq_port_unlock(dest_port); 632 if (dest) 633 snd_seq_client_unlock(dest); 634 635 if (result < 0 && !direct) { 636 result = bounce_error_event(client, event, result, atomic, hop); 637 } 638 return result; 639 } 640 641 642 /* 643 * send the event to all subscribers: 644 */ 645 static int deliver_to_subscribers(struct snd_seq_client *client, 646 struct snd_seq_event *event, 647 int atomic, int hop) 648 { 649 struct snd_seq_subscribers *subs; 650 int err, result = 0, num_ev = 0; 651 struct snd_seq_event event_saved; 652 struct snd_seq_client_port *src_port; 653 struct snd_seq_port_subs_info *grp; 654 655 src_port = snd_seq_port_use_ptr(client, event->source.port); 656 if (src_port == NULL) 657 return -EINVAL; /* invalid source port */ 658 /* save original event record */ 659 event_saved = *event; 660 grp = &src_port->c_src; 661 662 /* lock list */ 663 if (atomic) 664 read_lock(&grp->list_lock); 665 else 666 down_read_nested(&grp->list_mutex, hop); 667 list_for_each_entry(subs, &grp->list_head, src_list) { 668 /* both ports ready? */ 669 if (atomic_read(&subs->ref_count) != 2) 670 continue; 671 event->dest = subs->info.dest; 672 if (subs->info.flags & SNDRV_SEQ_PORT_SUBS_TIMESTAMP) 673 /* convert time according to flag with subscription */ 674 update_timestamp_of_queue(event, subs->info.queue, 675 subs->info.flags & SNDRV_SEQ_PORT_SUBS_TIME_REAL); 676 err = snd_seq_deliver_single_event(client, event, 677 0, atomic, hop); 678 if (err < 0) { 679 /* save first error that occurs and continue */ 680 if (!result) 681 result = err; 682 continue; 683 } 684 num_ev++; 685 /* restore original event record */ 686 *event = event_saved; 687 } 688 if (atomic) 689 read_unlock(&grp->list_lock); 690 else 691 up_read(&grp->list_mutex); 692 *event = event_saved; /* restore */ 693 snd_seq_port_unlock(src_port); 694 return (result < 0) ? result : num_ev; 695 } 696 697 698 #ifdef SUPPORT_BROADCAST 699 /* 700 * broadcast to all ports: 701 */ 702 static int port_broadcast_event(struct snd_seq_client *client, 703 struct snd_seq_event *event, 704 int atomic, int hop) 705 { 706 int num_ev = 0, err, result = 0; 707 struct snd_seq_client *dest_client; 708 struct snd_seq_client_port *port; 709 710 dest_client = get_event_dest_client(event, SNDRV_SEQ_FILTER_BROADCAST); 711 if (dest_client == NULL) 712 return 0; /* no matching destination */ 713 714 read_lock(&dest_client->ports_lock); 715 list_for_each_entry(port, &dest_client->ports_list_head, list) { 716 event->dest.port = port->addr.port; 717 /* pass NULL as source client to avoid error bounce */ 718 err = snd_seq_deliver_single_event(NULL, event, 719 SNDRV_SEQ_FILTER_BROADCAST, 720 atomic, hop); 721 if (err < 0) { 722 /* save first error that occurs and continue */ 723 if (!result) 724 result = err; 725 continue; 726 } 727 num_ev++; 728 } 729 read_unlock(&dest_client->ports_lock); 730 snd_seq_client_unlock(dest_client); 731 event->dest.port = SNDRV_SEQ_ADDRESS_BROADCAST; /* restore */ 732 return (result < 0) ? result : num_ev; 733 } 734 735 /* 736 * send the event to all clients: 737 * if destination port is also ADDRESS_BROADCAST, deliver to all ports. 738 */ 739 static int broadcast_event(struct snd_seq_client *client, 740 struct snd_seq_event *event, int atomic, int hop) 741 { 742 int err, result = 0, num_ev = 0; 743 int dest; 744 struct snd_seq_addr addr; 745 746 addr = event->dest; /* save */ 747 748 for (dest = 0; dest < SNDRV_SEQ_MAX_CLIENTS; dest++) { 749 /* don't send to itself */ 750 if (dest == client->number) 751 continue; 752 event->dest.client = dest; 753 event->dest.port = addr.port; 754 if (addr.port == SNDRV_SEQ_ADDRESS_BROADCAST) 755 err = port_broadcast_event(client, event, atomic, hop); 756 else 757 /* pass NULL as source client to avoid error bounce */ 758 err = snd_seq_deliver_single_event(NULL, event, 759 SNDRV_SEQ_FILTER_BROADCAST, 760 atomic, hop); 761 if (err < 0) { 762 /* save first error that occurs and continue */ 763 if (!result) 764 result = err; 765 continue; 766 } 767 num_ev += err; 768 } 769 event->dest = addr; /* restore */ 770 return (result < 0) ? result : num_ev; 771 } 772 773 774 /* multicast - not supported yet */ 775 static int multicast_event(struct snd_seq_client *client, struct snd_seq_event *event, 776 int atomic, int hop) 777 { 778 pr_debug("ALSA: seq: multicast not supported yet.\n"); 779 return 0; /* ignored */ 780 } 781 #endif /* SUPPORT_BROADCAST */ 782 783 784 /* deliver an event to the destination port(s). 785 * if the event is to subscribers or broadcast, the event is dispatched 786 * to multiple targets. 787 * 788 * RETURN VALUE: n > 0 : the number of delivered events. 789 * n == 0 : the event was not passed to any client. 790 * n < 0 : error - event was not processed. 791 */ 792 static int snd_seq_deliver_event(struct snd_seq_client *client, struct snd_seq_event *event, 793 int atomic, int hop) 794 { 795 int result; 796 797 hop++; 798 if (hop >= SNDRV_SEQ_MAX_HOPS) { 799 pr_debug("ALSA: seq: too long delivery path (%d:%d->%d:%d)\n", 800 event->source.client, event->source.port, 801 event->dest.client, event->dest.port); 802 return -EMLINK; 803 } 804 805 if (snd_seq_ev_is_variable(event) && 806 snd_BUG_ON(atomic && (event->data.ext.len & SNDRV_SEQ_EXT_USRPTR))) 807 return -EINVAL; 808 809 if (event->queue == SNDRV_SEQ_ADDRESS_SUBSCRIBERS || 810 event->dest.client == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) 811 result = deliver_to_subscribers(client, event, atomic, hop); 812 #ifdef SUPPORT_BROADCAST 813 else if (event->queue == SNDRV_SEQ_ADDRESS_BROADCAST || 814 event->dest.client == SNDRV_SEQ_ADDRESS_BROADCAST) 815 result = broadcast_event(client, event, atomic, hop); 816 else if (event->dest.client >= SNDRV_SEQ_MAX_CLIENTS) 817 result = multicast_event(client, event, atomic, hop); 818 else if (event->dest.port == SNDRV_SEQ_ADDRESS_BROADCAST) 819 result = port_broadcast_event(client, event, atomic, hop); 820 #endif 821 else 822 result = snd_seq_deliver_single_event(client, event, 0, atomic, hop); 823 824 return result; 825 } 826 827 /* 828 * dispatch an event cell: 829 * This function is called only from queue check routines in timer 830 * interrupts or after enqueued. 831 * The event cell shall be released or re-queued in this function. 832 * 833 * RETURN VALUE: n > 0 : the number of delivered events. 834 * n == 0 : the event was not passed to any client. 835 * n < 0 : error - event was not processed. 836 */ 837 int snd_seq_dispatch_event(struct snd_seq_event_cell *cell, int atomic, int hop) 838 { 839 struct snd_seq_client *client; 840 int result; 841 842 if (snd_BUG_ON(!cell)) 843 return -EINVAL; 844 845 client = snd_seq_client_use_ptr(cell->event.source.client); 846 if (client == NULL) { 847 snd_seq_cell_free(cell); /* release this cell */ 848 return -EINVAL; 849 } 850 851 if (cell->event.type == SNDRV_SEQ_EVENT_NOTE) { 852 /* NOTE event: 853 * the event cell is re-used as a NOTE-OFF event and 854 * enqueued again. 855 */ 856 struct snd_seq_event tmpev, *ev; 857 858 /* reserve this event to enqueue note-off later */ 859 tmpev = cell->event; 860 tmpev.type = SNDRV_SEQ_EVENT_NOTEON; 861 result = snd_seq_deliver_event(client, &tmpev, atomic, hop); 862 863 /* 864 * This was originally a note event. We now re-use the 865 * cell for the note-off event. 866 */ 867 868 ev = &cell->event; 869 ev->type = SNDRV_SEQ_EVENT_NOTEOFF; 870 ev->flags |= SNDRV_SEQ_PRIORITY_HIGH; 871 872 /* add the duration time */ 873 switch (ev->flags & SNDRV_SEQ_TIME_STAMP_MASK) { 874 case SNDRV_SEQ_TIME_STAMP_TICK: 875 ev->time.tick += ev->data.note.duration; 876 break; 877 case SNDRV_SEQ_TIME_STAMP_REAL: 878 /* unit for duration is ms */ 879 ev->time.time.tv_nsec += 1000000 * (ev->data.note.duration % 1000); 880 ev->time.time.tv_sec += ev->data.note.duration / 1000 + 881 ev->time.time.tv_nsec / 1000000000; 882 ev->time.time.tv_nsec %= 1000000000; 883 break; 884 } 885 ev->data.note.velocity = ev->data.note.off_velocity; 886 887 /* Now queue this cell as the note off event */ 888 if (snd_seq_enqueue_event(cell, atomic, hop) < 0) 889 snd_seq_cell_free(cell); /* release this cell */ 890 891 } else { 892 /* Normal events: 893 * event cell is freed after processing the event 894 */ 895 896 result = snd_seq_deliver_event(client, &cell->event, atomic, hop); 897 snd_seq_cell_free(cell); 898 } 899 900 snd_seq_client_unlock(client); 901 return result; 902 } 903 904 905 /* Allocate a cell from client pool and enqueue it to queue: 906 * if pool is empty and blocking is TRUE, sleep until a new cell is 907 * available. 908 */ 909 static int snd_seq_client_enqueue_event(struct snd_seq_client *client, 910 struct snd_seq_event *event, 911 struct file *file, int blocking, 912 int atomic, int hop, 913 struct mutex *mutexp) 914 { 915 struct snd_seq_event_cell *cell; 916 int err; 917 918 /* special queue values - force direct passing */ 919 if (event->queue == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) { 920 event->dest.client = SNDRV_SEQ_ADDRESS_SUBSCRIBERS; 921 event->queue = SNDRV_SEQ_QUEUE_DIRECT; 922 } else 923 #ifdef SUPPORT_BROADCAST 924 if (event->queue == SNDRV_SEQ_ADDRESS_BROADCAST) { 925 event->dest.client = SNDRV_SEQ_ADDRESS_BROADCAST; 926 event->queue = SNDRV_SEQ_QUEUE_DIRECT; 927 } 928 #endif 929 if (event->dest.client == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) { 930 /* check presence of source port */ 931 struct snd_seq_client_port *src_port = snd_seq_port_use_ptr(client, event->source.port); 932 if (src_port == NULL) 933 return -EINVAL; 934 snd_seq_port_unlock(src_port); 935 } 936 937 /* direct event processing without enqueued */ 938 if (snd_seq_ev_is_direct(event)) { 939 if (event->type == SNDRV_SEQ_EVENT_NOTE) 940 return -EINVAL; /* this event must be enqueued! */ 941 return snd_seq_deliver_event(client, event, atomic, hop); 942 } 943 944 /* Not direct, normal queuing */ 945 if (snd_seq_queue_is_used(event->queue, client->number) <= 0) 946 return -EINVAL; /* invalid queue */ 947 if (! snd_seq_write_pool_allocated(client)) 948 return -ENXIO; /* queue is not allocated */ 949 950 /* allocate an event cell */ 951 err = snd_seq_event_dup(client->pool, event, &cell, !blocking || atomic, 952 file, mutexp); 953 if (err < 0) 954 return err; 955 956 /* we got a cell. enqueue it. */ 957 if ((err = snd_seq_enqueue_event(cell, atomic, hop)) < 0) { 958 snd_seq_cell_free(cell); 959 return err; 960 } 961 962 return 0; 963 } 964 965 966 /* 967 * check validity of event type and data length. 968 * return non-zero if invalid. 969 */ 970 static int check_event_type_and_length(struct snd_seq_event *ev) 971 { 972 switch (snd_seq_ev_length_type(ev)) { 973 case SNDRV_SEQ_EVENT_LENGTH_FIXED: 974 if (snd_seq_ev_is_variable_type(ev)) 975 return -EINVAL; 976 break; 977 case SNDRV_SEQ_EVENT_LENGTH_VARIABLE: 978 if (! snd_seq_ev_is_variable_type(ev) || 979 (ev->data.ext.len & ~SNDRV_SEQ_EXT_MASK) >= SNDRV_SEQ_MAX_EVENT_LEN) 980 return -EINVAL; 981 break; 982 case SNDRV_SEQ_EVENT_LENGTH_VARUSR: 983 if (! snd_seq_ev_is_direct(ev)) 984 return -EINVAL; 985 break; 986 } 987 return 0; 988 } 989 990 991 /* handle write() */ 992 /* possible error values: 993 * -ENXIO invalid client or file open mode 994 * -ENOMEM malloc failed 995 * -EFAULT seg. fault during copy from user space 996 * -EINVAL invalid event 997 * -EAGAIN no space in output pool 998 * -EINTR interrupts while sleep 999 * -EMLINK too many hops 1000 * others depends on return value from driver callback 1001 */ 1002 static ssize_t snd_seq_write(struct file *file, const char __user *buf, 1003 size_t count, loff_t *offset) 1004 { 1005 struct snd_seq_client *client = file->private_data; 1006 int written = 0, len; 1007 int err; 1008 struct snd_seq_event event; 1009 1010 if (!(snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT)) 1011 return -ENXIO; 1012 1013 /* check client structures are in place */ 1014 if (snd_BUG_ON(!client)) 1015 return -ENXIO; 1016 1017 if (!client->accept_output || client->pool == NULL) 1018 return -ENXIO; 1019 1020 /* allocate the pool now if the pool is not allocated yet */ 1021 mutex_lock(&client->ioctl_mutex); 1022 if (client->pool->size > 0 && !snd_seq_write_pool_allocated(client)) { 1023 err = snd_seq_pool_init(client->pool); 1024 if (err < 0) 1025 goto out; 1026 } 1027 1028 /* only process whole events */ 1029 err = -EINVAL; 1030 while (count >= sizeof(struct snd_seq_event)) { 1031 /* Read in the event header from the user */ 1032 len = sizeof(event); 1033 if (copy_from_user(&event, buf, len)) { 1034 err = -EFAULT; 1035 break; 1036 } 1037 event.source.client = client->number; /* fill in client number */ 1038 /* Check for extension data length */ 1039 if (check_event_type_and_length(&event)) { 1040 err = -EINVAL; 1041 break; 1042 } 1043 1044 /* check for special events */ 1045 if (event.type == SNDRV_SEQ_EVENT_NONE) 1046 goto __skip_event; 1047 else if (snd_seq_ev_is_reserved(&event)) { 1048 err = -EINVAL; 1049 break; 1050 } 1051 1052 if (snd_seq_ev_is_variable(&event)) { 1053 int extlen = event.data.ext.len & ~SNDRV_SEQ_EXT_MASK; 1054 if ((size_t)(extlen + len) > count) { 1055 /* back out, will get an error this time or next */ 1056 err = -EINVAL; 1057 break; 1058 } 1059 /* set user space pointer */ 1060 event.data.ext.len = extlen | SNDRV_SEQ_EXT_USRPTR; 1061 event.data.ext.ptr = (char __force *)buf 1062 + sizeof(struct snd_seq_event); 1063 len += extlen; /* increment data length */ 1064 } else { 1065 #ifdef CONFIG_COMPAT 1066 if (client->convert32 && snd_seq_ev_is_varusr(&event)) { 1067 void *ptr = (void __force *)compat_ptr(event.data.raw32.d[1]); 1068 event.data.ext.ptr = ptr; 1069 } 1070 #endif 1071 } 1072 1073 /* ok, enqueue it */ 1074 err = snd_seq_client_enqueue_event(client, &event, file, 1075 !(file->f_flags & O_NONBLOCK), 1076 0, 0, &client->ioctl_mutex); 1077 if (err < 0) 1078 break; 1079 1080 __skip_event: 1081 /* Update pointers and counts */ 1082 count -= len; 1083 buf += len; 1084 written += len; 1085 } 1086 1087 out: 1088 mutex_unlock(&client->ioctl_mutex); 1089 return written ? written : err; 1090 } 1091 1092 1093 /* 1094 * handle polling 1095 */ 1096 static __poll_t snd_seq_poll(struct file *file, poll_table * wait) 1097 { 1098 struct snd_seq_client *client = file->private_data; 1099 __poll_t mask = 0; 1100 1101 /* check client structures are in place */ 1102 if (snd_BUG_ON(!client)) 1103 return EPOLLERR; 1104 1105 if ((snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_INPUT) && 1106 client->data.user.fifo) { 1107 1108 /* check if data is available in the outqueue */ 1109 if (snd_seq_fifo_poll_wait(client->data.user.fifo, file, wait)) 1110 mask |= EPOLLIN | EPOLLRDNORM; 1111 } 1112 1113 if (snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT) { 1114 1115 /* check if data is available in the pool */ 1116 if (!snd_seq_write_pool_allocated(client) || 1117 snd_seq_pool_poll_wait(client->pool, file, wait)) 1118 mask |= EPOLLOUT | EPOLLWRNORM; 1119 } 1120 1121 return mask; 1122 } 1123 1124 1125 /*-----------------------------------------------------*/ 1126 1127 static int snd_seq_ioctl_pversion(struct snd_seq_client *client, void *arg) 1128 { 1129 int *pversion = arg; 1130 1131 *pversion = SNDRV_SEQ_VERSION; 1132 return 0; 1133 } 1134 1135 static int snd_seq_ioctl_client_id(struct snd_seq_client *client, void *arg) 1136 { 1137 int *client_id = arg; 1138 1139 *client_id = client->number; 1140 return 0; 1141 } 1142 1143 /* SYSTEM_INFO ioctl() */ 1144 static int snd_seq_ioctl_system_info(struct snd_seq_client *client, void *arg) 1145 { 1146 struct snd_seq_system_info *info = arg; 1147 1148 memset(info, 0, sizeof(*info)); 1149 /* fill the info fields */ 1150 info->queues = SNDRV_SEQ_MAX_QUEUES; 1151 info->clients = SNDRV_SEQ_MAX_CLIENTS; 1152 info->ports = SNDRV_SEQ_MAX_PORTS; 1153 info->channels = 256; /* fixed limit */ 1154 info->cur_clients = client_usage.cur; 1155 info->cur_queues = snd_seq_queue_get_cur_queues(); 1156 1157 return 0; 1158 } 1159 1160 1161 /* RUNNING_MODE ioctl() */ 1162 static int snd_seq_ioctl_running_mode(struct snd_seq_client *client, void *arg) 1163 { 1164 struct snd_seq_running_info *info = arg; 1165 struct snd_seq_client *cptr; 1166 int err = 0; 1167 1168 /* requested client number */ 1169 cptr = snd_seq_client_use_ptr(info->client); 1170 if (cptr == NULL) 1171 return -ENOENT; /* don't change !!! */ 1172 1173 #ifdef SNDRV_BIG_ENDIAN 1174 if (!info->big_endian) { 1175 err = -EINVAL; 1176 goto __err; 1177 } 1178 #else 1179 if (info->big_endian) { 1180 err = -EINVAL; 1181 goto __err; 1182 } 1183 1184 #endif 1185 if (info->cpu_mode > sizeof(long)) { 1186 err = -EINVAL; 1187 goto __err; 1188 } 1189 cptr->convert32 = (info->cpu_mode < sizeof(long)); 1190 __err: 1191 snd_seq_client_unlock(cptr); 1192 return err; 1193 } 1194 1195 /* CLIENT_INFO ioctl() */ 1196 static void get_client_info(struct snd_seq_client *cptr, 1197 struct snd_seq_client_info *info) 1198 { 1199 info->client = cptr->number; 1200 1201 /* fill the info fields */ 1202 info->type = cptr->type; 1203 strcpy(info->name, cptr->name); 1204 info->filter = cptr->filter; 1205 info->event_lost = cptr->event_lost; 1206 memcpy(info->event_filter, cptr->event_filter, 32); 1207 info->num_ports = cptr->num_ports; 1208 1209 if (cptr->type == USER_CLIENT) 1210 info->pid = pid_vnr(cptr->data.user.owner); 1211 else 1212 info->pid = -1; 1213 1214 if (cptr->type == KERNEL_CLIENT) 1215 info->card = cptr->data.kernel.card ? cptr->data.kernel.card->number : -1; 1216 else 1217 info->card = -1; 1218 1219 memset(info->reserved, 0, sizeof(info->reserved)); 1220 } 1221 1222 static int snd_seq_ioctl_get_client_info(struct snd_seq_client *client, 1223 void *arg) 1224 { 1225 struct snd_seq_client_info *client_info = arg; 1226 struct snd_seq_client *cptr; 1227 1228 /* requested client number */ 1229 cptr = snd_seq_client_use_ptr(client_info->client); 1230 if (cptr == NULL) 1231 return -ENOENT; /* don't change !!! */ 1232 1233 get_client_info(cptr, client_info); 1234 snd_seq_client_unlock(cptr); 1235 1236 return 0; 1237 } 1238 1239 1240 /* CLIENT_INFO ioctl() */ 1241 static int snd_seq_ioctl_set_client_info(struct snd_seq_client *client, 1242 void *arg) 1243 { 1244 struct snd_seq_client_info *client_info = arg; 1245 1246 /* it is not allowed to set the info fields for an another client */ 1247 if (client->number != client_info->client) 1248 return -EPERM; 1249 /* also client type must be set now */ 1250 if (client->type != client_info->type) 1251 return -EINVAL; 1252 1253 /* fill the info fields */ 1254 if (client_info->name[0]) 1255 strscpy(client->name, client_info->name, sizeof(client->name)); 1256 1257 client->filter = client_info->filter; 1258 client->event_lost = client_info->event_lost; 1259 memcpy(client->event_filter, client_info->event_filter, 32); 1260 1261 return 0; 1262 } 1263 1264 1265 /* 1266 * CREATE PORT ioctl() 1267 */ 1268 static int snd_seq_ioctl_create_port(struct snd_seq_client *client, void *arg) 1269 { 1270 struct snd_seq_port_info *info = arg; 1271 struct snd_seq_client_port *port; 1272 struct snd_seq_port_callback *callback; 1273 int port_idx; 1274 1275 /* it is not allowed to create the port for an another client */ 1276 if (info->addr.client != client->number) 1277 return -EPERM; 1278 1279 port = snd_seq_create_port(client, (info->flags & SNDRV_SEQ_PORT_FLG_GIVEN_PORT) ? info->addr.port : -1); 1280 if (port == NULL) 1281 return -ENOMEM; 1282 1283 if (client->type == USER_CLIENT && info->kernel) { 1284 port_idx = port->addr.port; 1285 snd_seq_port_unlock(port); 1286 snd_seq_delete_port(client, port_idx); 1287 return -EINVAL; 1288 } 1289 if (client->type == KERNEL_CLIENT) { 1290 if ((callback = info->kernel) != NULL) { 1291 if (callback->owner) 1292 port->owner = callback->owner; 1293 port->private_data = callback->private_data; 1294 port->private_free = callback->private_free; 1295 port->event_input = callback->event_input; 1296 port->c_src.open = callback->subscribe; 1297 port->c_src.close = callback->unsubscribe; 1298 port->c_dest.open = callback->use; 1299 port->c_dest.close = callback->unuse; 1300 } 1301 } 1302 1303 info->addr = port->addr; 1304 1305 snd_seq_set_port_info(port, info); 1306 snd_seq_system_client_ev_port_start(port->addr.client, port->addr.port); 1307 snd_seq_port_unlock(port); 1308 1309 return 0; 1310 } 1311 1312 /* 1313 * DELETE PORT ioctl() 1314 */ 1315 static int snd_seq_ioctl_delete_port(struct snd_seq_client *client, void *arg) 1316 { 1317 struct snd_seq_port_info *info = arg; 1318 int err; 1319 1320 /* it is not allowed to remove the port for an another client */ 1321 if (info->addr.client != client->number) 1322 return -EPERM; 1323 1324 err = snd_seq_delete_port(client, info->addr.port); 1325 if (err >= 0) 1326 snd_seq_system_client_ev_port_exit(client->number, info->addr.port); 1327 return err; 1328 } 1329 1330 1331 /* 1332 * GET_PORT_INFO ioctl() (on any client) 1333 */ 1334 static int snd_seq_ioctl_get_port_info(struct snd_seq_client *client, void *arg) 1335 { 1336 struct snd_seq_port_info *info = arg; 1337 struct snd_seq_client *cptr; 1338 struct snd_seq_client_port *port; 1339 1340 cptr = snd_seq_client_use_ptr(info->addr.client); 1341 if (cptr == NULL) 1342 return -ENXIO; 1343 1344 port = snd_seq_port_use_ptr(cptr, info->addr.port); 1345 if (port == NULL) { 1346 snd_seq_client_unlock(cptr); 1347 return -ENOENT; /* don't change */ 1348 } 1349 1350 /* get port info */ 1351 snd_seq_get_port_info(port, info); 1352 snd_seq_port_unlock(port); 1353 snd_seq_client_unlock(cptr); 1354 1355 return 0; 1356 } 1357 1358 1359 /* 1360 * SET_PORT_INFO ioctl() (only ports on this/own client) 1361 */ 1362 static int snd_seq_ioctl_set_port_info(struct snd_seq_client *client, void *arg) 1363 { 1364 struct snd_seq_port_info *info = arg; 1365 struct snd_seq_client_port *port; 1366 1367 if (info->addr.client != client->number) /* only set our own ports ! */ 1368 return -EPERM; 1369 port = snd_seq_port_use_ptr(client, info->addr.port); 1370 if (port) { 1371 snd_seq_set_port_info(port, info); 1372 snd_seq_port_unlock(port); 1373 } 1374 return 0; 1375 } 1376 1377 1378 /* 1379 * port subscription (connection) 1380 */ 1381 #define PERM_RD (SNDRV_SEQ_PORT_CAP_READ|SNDRV_SEQ_PORT_CAP_SUBS_READ) 1382 #define PERM_WR (SNDRV_SEQ_PORT_CAP_WRITE|SNDRV_SEQ_PORT_CAP_SUBS_WRITE) 1383 1384 static int check_subscription_permission(struct snd_seq_client *client, 1385 struct snd_seq_client_port *sport, 1386 struct snd_seq_client_port *dport, 1387 struct snd_seq_port_subscribe *subs) 1388 { 1389 if (client->number != subs->sender.client && 1390 client->number != subs->dest.client) { 1391 /* connection by third client - check export permission */ 1392 if (check_port_perm(sport, SNDRV_SEQ_PORT_CAP_NO_EXPORT)) 1393 return -EPERM; 1394 if (check_port_perm(dport, SNDRV_SEQ_PORT_CAP_NO_EXPORT)) 1395 return -EPERM; 1396 } 1397 1398 /* check read permission */ 1399 /* if sender or receiver is the subscribing client itself, 1400 * no permission check is necessary 1401 */ 1402 if (client->number != subs->sender.client) { 1403 if (! check_port_perm(sport, PERM_RD)) 1404 return -EPERM; 1405 } 1406 /* check write permission */ 1407 if (client->number != subs->dest.client) { 1408 if (! check_port_perm(dport, PERM_WR)) 1409 return -EPERM; 1410 } 1411 return 0; 1412 } 1413 1414 /* 1415 * send an subscription notify event to user client: 1416 * client must be user client. 1417 */ 1418 int snd_seq_client_notify_subscription(int client, int port, 1419 struct snd_seq_port_subscribe *info, 1420 int evtype) 1421 { 1422 struct snd_seq_event event; 1423 1424 memset(&event, 0, sizeof(event)); 1425 event.type = evtype; 1426 event.data.connect.dest = info->dest; 1427 event.data.connect.sender = info->sender; 1428 1429 return snd_seq_system_notify(client, port, &event); /* non-atomic */ 1430 } 1431 1432 1433 /* 1434 * add to port's subscription list IOCTL interface 1435 */ 1436 static int snd_seq_ioctl_subscribe_port(struct snd_seq_client *client, 1437 void *arg) 1438 { 1439 struct snd_seq_port_subscribe *subs = arg; 1440 int result = -EINVAL; 1441 struct snd_seq_client *receiver = NULL, *sender = NULL; 1442 struct snd_seq_client_port *sport = NULL, *dport = NULL; 1443 1444 if ((receiver = snd_seq_client_use_ptr(subs->dest.client)) == NULL) 1445 goto __end; 1446 if ((sender = snd_seq_client_use_ptr(subs->sender.client)) == NULL) 1447 goto __end; 1448 if ((sport = snd_seq_port_use_ptr(sender, subs->sender.port)) == NULL) 1449 goto __end; 1450 if ((dport = snd_seq_port_use_ptr(receiver, subs->dest.port)) == NULL) 1451 goto __end; 1452 1453 result = check_subscription_permission(client, sport, dport, subs); 1454 if (result < 0) 1455 goto __end; 1456 1457 /* connect them */ 1458 result = snd_seq_port_connect(client, sender, sport, receiver, dport, subs); 1459 if (! result) /* broadcast announce */ 1460 snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0, 1461 subs, SNDRV_SEQ_EVENT_PORT_SUBSCRIBED); 1462 __end: 1463 if (sport) 1464 snd_seq_port_unlock(sport); 1465 if (dport) 1466 snd_seq_port_unlock(dport); 1467 if (sender) 1468 snd_seq_client_unlock(sender); 1469 if (receiver) 1470 snd_seq_client_unlock(receiver); 1471 return result; 1472 } 1473 1474 1475 /* 1476 * remove from port's subscription list 1477 */ 1478 static int snd_seq_ioctl_unsubscribe_port(struct snd_seq_client *client, 1479 void *arg) 1480 { 1481 struct snd_seq_port_subscribe *subs = arg; 1482 int result = -ENXIO; 1483 struct snd_seq_client *receiver = NULL, *sender = NULL; 1484 struct snd_seq_client_port *sport = NULL, *dport = NULL; 1485 1486 if ((receiver = snd_seq_client_use_ptr(subs->dest.client)) == NULL) 1487 goto __end; 1488 if ((sender = snd_seq_client_use_ptr(subs->sender.client)) == NULL) 1489 goto __end; 1490 if ((sport = snd_seq_port_use_ptr(sender, subs->sender.port)) == NULL) 1491 goto __end; 1492 if ((dport = snd_seq_port_use_ptr(receiver, subs->dest.port)) == NULL) 1493 goto __end; 1494 1495 result = check_subscription_permission(client, sport, dport, subs); 1496 if (result < 0) 1497 goto __end; 1498 1499 result = snd_seq_port_disconnect(client, sender, sport, receiver, dport, subs); 1500 if (! result) /* broadcast announce */ 1501 snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0, 1502 subs, SNDRV_SEQ_EVENT_PORT_UNSUBSCRIBED); 1503 __end: 1504 if (sport) 1505 snd_seq_port_unlock(sport); 1506 if (dport) 1507 snd_seq_port_unlock(dport); 1508 if (sender) 1509 snd_seq_client_unlock(sender); 1510 if (receiver) 1511 snd_seq_client_unlock(receiver); 1512 return result; 1513 } 1514 1515 1516 /* CREATE_QUEUE ioctl() */ 1517 static int snd_seq_ioctl_create_queue(struct snd_seq_client *client, void *arg) 1518 { 1519 struct snd_seq_queue_info *info = arg; 1520 struct snd_seq_queue *q; 1521 1522 q = snd_seq_queue_alloc(client->number, info->locked, info->flags); 1523 if (IS_ERR(q)) 1524 return PTR_ERR(q); 1525 1526 info->queue = q->queue; 1527 info->locked = q->locked; 1528 info->owner = q->owner; 1529 1530 /* set queue name */ 1531 if (!info->name[0]) 1532 snprintf(info->name, sizeof(info->name), "Queue-%d", q->queue); 1533 strscpy(q->name, info->name, sizeof(q->name)); 1534 snd_use_lock_free(&q->use_lock); 1535 1536 return 0; 1537 } 1538 1539 /* DELETE_QUEUE ioctl() */ 1540 static int snd_seq_ioctl_delete_queue(struct snd_seq_client *client, void *arg) 1541 { 1542 struct snd_seq_queue_info *info = arg; 1543 1544 return snd_seq_queue_delete(client->number, info->queue); 1545 } 1546 1547 /* GET_QUEUE_INFO ioctl() */ 1548 static int snd_seq_ioctl_get_queue_info(struct snd_seq_client *client, 1549 void *arg) 1550 { 1551 struct snd_seq_queue_info *info = arg; 1552 struct snd_seq_queue *q; 1553 1554 q = queueptr(info->queue); 1555 if (q == NULL) 1556 return -EINVAL; 1557 1558 memset(info, 0, sizeof(*info)); 1559 info->queue = q->queue; 1560 info->owner = q->owner; 1561 info->locked = q->locked; 1562 strlcpy(info->name, q->name, sizeof(info->name)); 1563 queuefree(q); 1564 1565 return 0; 1566 } 1567 1568 /* SET_QUEUE_INFO ioctl() */ 1569 static int snd_seq_ioctl_set_queue_info(struct snd_seq_client *client, 1570 void *arg) 1571 { 1572 struct snd_seq_queue_info *info = arg; 1573 struct snd_seq_queue *q; 1574 1575 if (info->owner != client->number) 1576 return -EINVAL; 1577 1578 /* change owner/locked permission */ 1579 if (snd_seq_queue_check_access(info->queue, client->number)) { 1580 if (snd_seq_queue_set_owner(info->queue, client->number, info->locked) < 0) 1581 return -EPERM; 1582 if (info->locked) 1583 snd_seq_queue_use(info->queue, client->number, 1); 1584 } else { 1585 return -EPERM; 1586 } 1587 1588 q = queueptr(info->queue); 1589 if (! q) 1590 return -EINVAL; 1591 if (q->owner != client->number) { 1592 queuefree(q); 1593 return -EPERM; 1594 } 1595 strscpy(q->name, info->name, sizeof(q->name)); 1596 queuefree(q); 1597 1598 return 0; 1599 } 1600 1601 /* GET_NAMED_QUEUE ioctl() */ 1602 static int snd_seq_ioctl_get_named_queue(struct snd_seq_client *client, 1603 void *arg) 1604 { 1605 struct snd_seq_queue_info *info = arg; 1606 struct snd_seq_queue *q; 1607 1608 q = snd_seq_queue_find_name(info->name); 1609 if (q == NULL) 1610 return -EINVAL; 1611 info->queue = q->queue; 1612 info->owner = q->owner; 1613 info->locked = q->locked; 1614 queuefree(q); 1615 1616 return 0; 1617 } 1618 1619 /* GET_QUEUE_STATUS ioctl() */ 1620 static int snd_seq_ioctl_get_queue_status(struct snd_seq_client *client, 1621 void *arg) 1622 { 1623 struct snd_seq_queue_status *status = arg; 1624 struct snd_seq_queue *queue; 1625 struct snd_seq_timer *tmr; 1626 1627 queue = queueptr(status->queue); 1628 if (queue == NULL) 1629 return -EINVAL; 1630 memset(status, 0, sizeof(*status)); 1631 status->queue = queue->queue; 1632 1633 tmr = queue->timer; 1634 status->events = queue->tickq->cells + queue->timeq->cells; 1635 1636 status->time = snd_seq_timer_get_cur_time(tmr); 1637 status->tick = snd_seq_timer_get_cur_tick(tmr); 1638 1639 status->running = tmr->running; 1640 1641 status->flags = queue->flags; 1642 queuefree(queue); 1643 1644 return 0; 1645 } 1646 1647 1648 /* GET_QUEUE_TEMPO ioctl() */ 1649 static int snd_seq_ioctl_get_queue_tempo(struct snd_seq_client *client, 1650 void *arg) 1651 { 1652 struct snd_seq_queue_tempo *tempo = arg; 1653 struct snd_seq_queue *queue; 1654 struct snd_seq_timer *tmr; 1655 1656 queue = queueptr(tempo->queue); 1657 if (queue == NULL) 1658 return -EINVAL; 1659 memset(tempo, 0, sizeof(*tempo)); 1660 tempo->queue = queue->queue; 1661 1662 tmr = queue->timer; 1663 1664 tempo->tempo = tmr->tempo; 1665 tempo->ppq = tmr->ppq; 1666 tempo->skew_value = tmr->skew; 1667 tempo->skew_base = tmr->skew_base; 1668 queuefree(queue); 1669 1670 return 0; 1671 } 1672 1673 1674 /* SET_QUEUE_TEMPO ioctl() */ 1675 int snd_seq_set_queue_tempo(int client, struct snd_seq_queue_tempo *tempo) 1676 { 1677 if (!snd_seq_queue_check_access(tempo->queue, client)) 1678 return -EPERM; 1679 return snd_seq_queue_timer_set_tempo(tempo->queue, client, tempo); 1680 } 1681 EXPORT_SYMBOL(snd_seq_set_queue_tempo); 1682 1683 static int snd_seq_ioctl_set_queue_tempo(struct snd_seq_client *client, 1684 void *arg) 1685 { 1686 struct snd_seq_queue_tempo *tempo = arg; 1687 int result; 1688 1689 result = snd_seq_set_queue_tempo(client->number, tempo); 1690 return result < 0 ? result : 0; 1691 } 1692 1693 1694 /* GET_QUEUE_TIMER ioctl() */ 1695 static int snd_seq_ioctl_get_queue_timer(struct snd_seq_client *client, 1696 void *arg) 1697 { 1698 struct snd_seq_queue_timer *timer = arg; 1699 struct snd_seq_queue *queue; 1700 struct snd_seq_timer *tmr; 1701 1702 queue = queueptr(timer->queue); 1703 if (queue == NULL) 1704 return -EINVAL; 1705 1706 mutex_lock(&queue->timer_mutex); 1707 tmr = queue->timer; 1708 memset(timer, 0, sizeof(*timer)); 1709 timer->queue = queue->queue; 1710 1711 timer->type = tmr->type; 1712 if (tmr->type == SNDRV_SEQ_TIMER_ALSA) { 1713 timer->u.alsa.id = tmr->alsa_id; 1714 timer->u.alsa.resolution = tmr->preferred_resolution; 1715 } 1716 mutex_unlock(&queue->timer_mutex); 1717 queuefree(queue); 1718 1719 return 0; 1720 } 1721 1722 1723 /* SET_QUEUE_TIMER ioctl() */ 1724 static int snd_seq_ioctl_set_queue_timer(struct snd_seq_client *client, 1725 void *arg) 1726 { 1727 struct snd_seq_queue_timer *timer = arg; 1728 int result = 0; 1729 1730 if (timer->type != SNDRV_SEQ_TIMER_ALSA) 1731 return -EINVAL; 1732 1733 if (snd_seq_queue_check_access(timer->queue, client->number)) { 1734 struct snd_seq_queue *q; 1735 struct snd_seq_timer *tmr; 1736 1737 q = queueptr(timer->queue); 1738 if (q == NULL) 1739 return -ENXIO; 1740 mutex_lock(&q->timer_mutex); 1741 tmr = q->timer; 1742 snd_seq_queue_timer_close(timer->queue); 1743 tmr->type = timer->type; 1744 if (tmr->type == SNDRV_SEQ_TIMER_ALSA) { 1745 tmr->alsa_id = timer->u.alsa.id; 1746 tmr->preferred_resolution = timer->u.alsa.resolution; 1747 } 1748 result = snd_seq_queue_timer_open(timer->queue); 1749 mutex_unlock(&q->timer_mutex); 1750 queuefree(q); 1751 } else { 1752 return -EPERM; 1753 } 1754 1755 return result; 1756 } 1757 1758 1759 /* GET_QUEUE_CLIENT ioctl() */ 1760 static int snd_seq_ioctl_get_queue_client(struct snd_seq_client *client, 1761 void *arg) 1762 { 1763 struct snd_seq_queue_client *info = arg; 1764 int used; 1765 1766 used = snd_seq_queue_is_used(info->queue, client->number); 1767 if (used < 0) 1768 return -EINVAL; 1769 info->used = used; 1770 info->client = client->number; 1771 1772 return 0; 1773 } 1774 1775 1776 /* SET_QUEUE_CLIENT ioctl() */ 1777 static int snd_seq_ioctl_set_queue_client(struct snd_seq_client *client, 1778 void *arg) 1779 { 1780 struct snd_seq_queue_client *info = arg; 1781 int err; 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(struct snd_seq_client *client, 1795 void *arg) 1796 { 1797 struct snd_seq_client_pool *info = arg; 1798 struct snd_seq_client *cptr; 1799 1800 cptr = snd_seq_client_use_ptr(info->client); 1801 if (cptr == NULL) 1802 return -ENOENT; 1803 memset(info, 0, sizeof(*info)); 1804 info->client = cptr->number; 1805 info->output_pool = cptr->pool->size; 1806 info->output_room = cptr->pool->room; 1807 info->output_free = info->output_pool; 1808 info->output_free = snd_seq_unused_cells(cptr->pool); 1809 if (cptr->type == USER_CLIENT) { 1810 info->input_pool = cptr->data.user.fifo_pool_size; 1811 info->input_free = info->input_pool; 1812 if (cptr->data.user.fifo) 1813 info->input_free = snd_seq_unused_cells(cptr->data.user.fifo->pool); 1814 } else { 1815 info->input_pool = 0; 1816 info->input_free = 0; 1817 } 1818 snd_seq_client_unlock(cptr); 1819 1820 return 0; 1821 } 1822 1823 /* SET_CLIENT_POOL ioctl() */ 1824 static int snd_seq_ioctl_set_client_pool(struct snd_seq_client *client, 1825 void *arg) 1826 { 1827 struct snd_seq_client_pool *info = arg; 1828 int rc; 1829 1830 if (client->number != info->client) 1831 return -EINVAL; /* can't change other clients */ 1832 1833 if (info->output_pool >= 1 && info->output_pool <= SNDRV_SEQ_MAX_EVENTS && 1834 (! snd_seq_write_pool_allocated(client) || 1835 info->output_pool != client->pool->size)) { 1836 if (snd_seq_write_pool_allocated(client)) { 1837 /* is the pool in use? */ 1838 if (atomic_read(&client->pool->counter)) 1839 return -EBUSY; 1840 /* remove all existing cells */ 1841 snd_seq_pool_mark_closing(client->pool); 1842 snd_seq_pool_done(client->pool); 1843 } 1844 client->pool->size = info->output_pool; 1845 rc = snd_seq_pool_init(client->pool); 1846 if (rc < 0) 1847 return rc; 1848 } 1849 if (client->type == USER_CLIENT && client->data.user.fifo != NULL && 1850 info->input_pool >= 1 && 1851 info->input_pool <= SNDRV_SEQ_MAX_CLIENT_EVENTS && 1852 info->input_pool != client->data.user.fifo_pool_size) { 1853 /* change pool size */ 1854 rc = snd_seq_fifo_resize(client->data.user.fifo, info->input_pool); 1855 if (rc < 0) 1856 return rc; 1857 client->data.user.fifo_pool_size = info->input_pool; 1858 } 1859 if (info->output_room >= 1 && 1860 info->output_room <= client->pool->size) { 1861 client->pool->room = info->output_room; 1862 } 1863 1864 return snd_seq_ioctl_get_client_pool(client, arg); 1865 } 1866 1867 1868 /* REMOVE_EVENTS ioctl() */ 1869 static int snd_seq_ioctl_remove_events(struct snd_seq_client *client, 1870 void *arg) 1871 { 1872 struct snd_seq_remove_events *info = arg; 1873 1874 /* 1875 * Input mostly not implemented XXX. 1876 */ 1877 if (info->remove_mode & SNDRV_SEQ_REMOVE_INPUT) { 1878 /* 1879 * No restrictions so for a user client we can clear 1880 * the whole fifo 1881 */ 1882 if (client->type == USER_CLIENT && client->data.user.fifo) 1883 snd_seq_fifo_clear(client->data.user.fifo); 1884 } 1885 1886 if (info->remove_mode & SNDRV_SEQ_REMOVE_OUTPUT) 1887 snd_seq_queue_remove_cells(client->number, info); 1888 1889 return 0; 1890 } 1891 1892 1893 /* 1894 * get subscription info 1895 */ 1896 static int snd_seq_ioctl_get_subscription(struct snd_seq_client *client, 1897 void *arg) 1898 { 1899 struct snd_seq_port_subscribe *subs = arg; 1900 int result; 1901 struct snd_seq_client *sender = NULL; 1902 struct snd_seq_client_port *sport = NULL; 1903 struct snd_seq_subscribers *p; 1904 1905 result = -EINVAL; 1906 if ((sender = snd_seq_client_use_ptr(subs->sender.client)) == NULL) 1907 goto __end; 1908 if ((sport = snd_seq_port_use_ptr(sender, subs->sender.port)) == NULL) 1909 goto __end; 1910 p = snd_seq_port_get_subscription(&sport->c_src, &subs->dest); 1911 if (p) { 1912 result = 0; 1913 *subs = p->info; 1914 } else 1915 result = -ENOENT; 1916 1917 __end: 1918 if (sport) 1919 snd_seq_port_unlock(sport); 1920 if (sender) 1921 snd_seq_client_unlock(sender); 1922 1923 return result; 1924 } 1925 1926 1927 /* 1928 * get subscription info - check only its presence 1929 */ 1930 static int snd_seq_ioctl_query_subs(struct snd_seq_client *client, void *arg) 1931 { 1932 struct snd_seq_query_subs *subs = arg; 1933 int result = -ENXIO; 1934 struct snd_seq_client *cptr = NULL; 1935 struct snd_seq_client_port *port = NULL; 1936 struct snd_seq_port_subs_info *group; 1937 struct list_head *p; 1938 int i; 1939 1940 if ((cptr = snd_seq_client_use_ptr(subs->root.client)) == NULL) 1941 goto __end; 1942 if ((port = snd_seq_port_use_ptr(cptr, subs->root.port)) == NULL) 1943 goto __end; 1944 1945 switch (subs->type) { 1946 case SNDRV_SEQ_QUERY_SUBS_READ: 1947 group = &port->c_src; 1948 break; 1949 case SNDRV_SEQ_QUERY_SUBS_WRITE: 1950 group = &port->c_dest; 1951 break; 1952 default: 1953 goto __end; 1954 } 1955 1956 down_read(&group->list_mutex); 1957 /* search for the subscriber */ 1958 subs->num_subs = group->count; 1959 i = 0; 1960 result = -ENOENT; 1961 list_for_each(p, &group->list_head) { 1962 if (i++ == subs->index) { 1963 /* found! */ 1964 struct snd_seq_subscribers *s; 1965 if (subs->type == SNDRV_SEQ_QUERY_SUBS_READ) { 1966 s = list_entry(p, struct snd_seq_subscribers, src_list); 1967 subs->addr = s->info.dest; 1968 } else { 1969 s = list_entry(p, struct snd_seq_subscribers, dest_list); 1970 subs->addr = s->info.sender; 1971 } 1972 subs->flags = s->info.flags; 1973 subs->queue = s->info.queue; 1974 result = 0; 1975 break; 1976 } 1977 } 1978 up_read(&group->list_mutex); 1979 1980 __end: 1981 if (port) 1982 snd_seq_port_unlock(port); 1983 if (cptr) 1984 snd_seq_client_unlock(cptr); 1985 1986 return result; 1987 } 1988 1989 1990 /* 1991 * query next client 1992 */ 1993 static int snd_seq_ioctl_query_next_client(struct snd_seq_client *client, 1994 void *arg) 1995 { 1996 struct snd_seq_client_info *info = arg; 1997 struct snd_seq_client *cptr = NULL; 1998 1999 /* search for next client */ 2000 if (info->client < INT_MAX) 2001 info->client++; 2002 if (info->client < 0) 2003 info->client = 0; 2004 for (; info->client < SNDRV_SEQ_MAX_CLIENTS; info->client++) { 2005 cptr = snd_seq_client_use_ptr(info->client); 2006 if (cptr) 2007 break; /* found */ 2008 } 2009 if (cptr == NULL) 2010 return -ENOENT; 2011 2012 get_client_info(cptr, info); 2013 snd_seq_client_unlock(cptr); 2014 2015 return 0; 2016 } 2017 2018 /* 2019 * query next port 2020 */ 2021 static int snd_seq_ioctl_query_next_port(struct snd_seq_client *client, 2022 void *arg) 2023 { 2024 struct snd_seq_port_info *info = arg; 2025 struct snd_seq_client *cptr; 2026 struct snd_seq_client_port *port = NULL; 2027 2028 cptr = snd_seq_client_use_ptr(info->addr.client); 2029 if (cptr == NULL) 2030 return -ENXIO; 2031 2032 /* search for next port */ 2033 info->addr.port++; 2034 port = snd_seq_port_query_nearest(cptr, info); 2035 if (port == NULL) { 2036 snd_seq_client_unlock(cptr); 2037 return -ENOENT; 2038 } 2039 2040 /* get port info */ 2041 info->addr = port->addr; 2042 snd_seq_get_port_info(port, info); 2043 snd_seq_port_unlock(port); 2044 snd_seq_client_unlock(cptr); 2045 2046 return 0; 2047 } 2048 2049 /* -------------------------------------------------------- */ 2050 2051 static const struct ioctl_handler { 2052 unsigned int cmd; 2053 int (*func)(struct snd_seq_client *client, void *arg); 2054 } ioctl_handlers[] = { 2055 { SNDRV_SEQ_IOCTL_PVERSION, snd_seq_ioctl_pversion }, 2056 { SNDRV_SEQ_IOCTL_CLIENT_ID, snd_seq_ioctl_client_id }, 2057 { SNDRV_SEQ_IOCTL_SYSTEM_INFO, snd_seq_ioctl_system_info }, 2058 { SNDRV_SEQ_IOCTL_RUNNING_MODE, snd_seq_ioctl_running_mode }, 2059 { SNDRV_SEQ_IOCTL_GET_CLIENT_INFO, snd_seq_ioctl_get_client_info }, 2060 { SNDRV_SEQ_IOCTL_SET_CLIENT_INFO, snd_seq_ioctl_set_client_info }, 2061 { SNDRV_SEQ_IOCTL_CREATE_PORT, snd_seq_ioctl_create_port }, 2062 { SNDRV_SEQ_IOCTL_DELETE_PORT, snd_seq_ioctl_delete_port }, 2063 { SNDRV_SEQ_IOCTL_GET_PORT_INFO, snd_seq_ioctl_get_port_info }, 2064 { SNDRV_SEQ_IOCTL_SET_PORT_INFO, snd_seq_ioctl_set_port_info }, 2065 { SNDRV_SEQ_IOCTL_SUBSCRIBE_PORT, snd_seq_ioctl_subscribe_port }, 2066 { SNDRV_SEQ_IOCTL_UNSUBSCRIBE_PORT, snd_seq_ioctl_unsubscribe_port }, 2067 { SNDRV_SEQ_IOCTL_CREATE_QUEUE, snd_seq_ioctl_create_queue }, 2068 { SNDRV_SEQ_IOCTL_DELETE_QUEUE, snd_seq_ioctl_delete_queue }, 2069 { SNDRV_SEQ_IOCTL_GET_QUEUE_INFO, snd_seq_ioctl_get_queue_info }, 2070 { SNDRV_SEQ_IOCTL_SET_QUEUE_INFO, snd_seq_ioctl_set_queue_info }, 2071 { SNDRV_SEQ_IOCTL_GET_NAMED_QUEUE, snd_seq_ioctl_get_named_queue }, 2072 { SNDRV_SEQ_IOCTL_GET_QUEUE_STATUS, snd_seq_ioctl_get_queue_status }, 2073 { SNDRV_SEQ_IOCTL_GET_QUEUE_TEMPO, snd_seq_ioctl_get_queue_tempo }, 2074 { SNDRV_SEQ_IOCTL_SET_QUEUE_TEMPO, snd_seq_ioctl_set_queue_tempo }, 2075 { SNDRV_SEQ_IOCTL_GET_QUEUE_TIMER, snd_seq_ioctl_get_queue_timer }, 2076 { SNDRV_SEQ_IOCTL_SET_QUEUE_TIMER, snd_seq_ioctl_set_queue_timer }, 2077 { SNDRV_SEQ_IOCTL_GET_QUEUE_CLIENT, snd_seq_ioctl_get_queue_client }, 2078 { SNDRV_SEQ_IOCTL_SET_QUEUE_CLIENT, snd_seq_ioctl_set_queue_client }, 2079 { SNDRV_SEQ_IOCTL_GET_CLIENT_POOL, snd_seq_ioctl_get_client_pool }, 2080 { SNDRV_SEQ_IOCTL_SET_CLIENT_POOL, snd_seq_ioctl_set_client_pool }, 2081 { SNDRV_SEQ_IOCTL_GET_SUBSCRIPTION, snd_seq_ioctl_get_subscription }, 2082 { SNDRV_SEQ_IOCTL_QUERY_NEXT_CLIENT, snd_seq_ioctl_query_next_client }, 2083 { SNDRV_SEQ_IOCTL_QUERY_NEXT_PORT, snd_seq_ioctl_query_next_port }, 2084 { SNDRV_SEQ_IOCTL_REMOVE_EVENTS, snd_seq_ioctl_remove_events }, 2085 { SNDRV_SEQ_IOCTL_QUERY_SUBS, snd_seq_ioctl_query_subs }, 2086 { 0, NULL }, 2087 }; 2088 2089 static long snd_seq_ioctl(struct file *file, unsigned int cmd, 2090 unsigned long arg) 2091 { 2092 struct snd_seq_client *client = file->private_data; 2093 /* To use kernel stack for ioctl data. */ 2094 union { 2095 int pversion; 2096 int client_id; 2097 struct snd_seq_system_info system_info; 2098 struct snd_seq_running_info running_info; 2099 struct snd_seq_client_info client_info; 2100 struct snd_seq_port_info port_info; 2101 struct snd_seq_port_subscribe port_subscribe; 2102 struct snd_seq_queue_info queue_info; 2103 struct snd_seq_queue_status queue_status; 2104 struct snd_seq_queue_tempo tempo; 2105 struct snd_seq_queue_timer queue_timer; 2106 struct snd_seq_queue_client queue_client; 2107 struct snd_seq_client_pool client_pool; 2108 struct snd_seq_remove_events remove_events; 2109 struct snd_seq_query_subs query_subs; 2110 } buf; 2111 const struct ioctl_handler *handler; 2112 unsigned long size; 2113 int err; 2114 2115 if (snd_BUG_ON(!client)) 2116 return -ENXIO; 2117 2118 for (handler = ioctl_handlers; handler->cmd > 0; ++handler) { 2119 if (handler->cmd == cmd) 2120 break; 2121 } 2122 if (handler->cmd == 0) 2123 return -ENOTTY; 2124 2125 memset(&buf, 0, sizeof(buf)); 2126 2127 /* 2128 * All of ioctl commands for ALSA sequencer get an argument of size 2129 * within 13 bits. We can safely pick up the size from the command. 2130 */ 2131 size = _IOC_SIZE(handler->cmd); 2132 if (handler->cmd & IOC_IN) { 2133 if (copy_from_user(&buf, (const void __user *)arg, size)) 2134 return -EFAULT; 2135 } 2136 2137 mutex_lock(&client->ioctl_mutex); 2138 err = handler->func(client, &buf); 2139 mutex_unlock(&client->ioctl_mutex); 2140 if (err >= 0) { 2141 /* Some commands includes a bug in 'dir' field. */ 2142 if (handler->cmd == SNDRV_SEQ_IOCTL_SET_QUEUE_CLIENT || 2143 handler->cmd == SNDRV_SEQ_IOCTL_SET_CLIENT_POOL || 2144 (handler->cmd & IOC_OUT)) 2145 if (copy_to_user((void __user *)arg, &buf, size)) 2146 return -EFAULT; 2147 } 2148 2149 return err; 2150 } 2151 2152 #ifdef CONFIG_COMPAT 2153 #include "seq_compat.c" 2154 #else 2155 #define snd_seq_ioctl_compat NULL 2156 #endif 2157 2158 /* -------------------------------------------------------- */ 2159 2160 2161 /* exported to kernel modules */ 2162 int snd_seq_create_kernel_client(struct snd_card *card, int client_index, 2163 const char *name_fmt, ...) 2164 { 2165 struct snd_seq_client *client; 2166 va_list args; 2167 2168 if (snd_BUG_ON(in_interrupt())) 2169 return -EBUSY; 2170 2171 if (card && client_index >= SNDRV_SEQ_CLIENTS_PER_CARD) 2172 return -EINVAL; 2173 if (card == NULL && client_index >= SNDRV_SEQ_GLOBAL_CLIENTS) 2174 return -EINVAL; 2175 2176 mutex_lock(®ister_mutex); 2177 2178 if (card) { 2179 client_index += SNDRV_SEQ_GLOBAL_CLIENTS 2180 + card->number * SNDRV_SEQ_CLIENTS_PER_CARD; 2181 if (client_index >= SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN) 2182 client_index = -1; 2183 } 2184 2185 /* empty write queue as default */ 2186 client = seq_create_client1(client_index, 0); 2187 if (client == NULL) { 2188 mutex_unlock(®ister_mutex); 2189 return -EBUSY; /* failure code */ 2190 } 2191 usage_alloc(&client_usage, 1); 2192 2193 client->accept_input = 1; 2194 client->accept_output = 1; 2195 client->data.kernel.card = card; 2196 2197 va_start(args, name_fmt); 2198 vsnprintf(client->name, sizeof(client->name), name_fmt, args); 2199 va_end(args); 2200 2201 client->type = KERNEL_CLIENT; 2202 mutex_unlock(®ister_mutex); 2203 2204 /* make others aware this new client */ 2205 snd_seq_system_client_ev_client_start(client->number); 2206 2207 /* return client number to caller */ 2208 return client->number; 2209 } 2210 EXPORT_SYMBOL(snd_seq_create_kernel_client); 2211 2212 /* exported to kernel modules */ 2213 int snd_seq_delete_kernel_client(int client) 2214 { 2215 struct snd_seq_client *ptr; 2216 2217 if (snd_BUG_ON(in_interrupt())) 2218 return -EBUSY; 2219 2220 ptr = clientptr(client); 2221 if (ptr == NULL) 2222 return -EINVAL; 2223 2224 seq_free_client(ptr); 2225 kfree(ptr); 2226 return 0; 2227 } 2228 EXPORT_SYMBOL(snd_seq_delete_kernel_client); 2229 2230 /* skeleton to enqueue event, called from snd_seq_kernel_client_enqueue 2231 * and snd_seq_kernel_client_enqueue_blocking 2232 */ 2233 static int kernel_client_enqueue(int client, struct snd_seq_event *ev, 2234 struct file *file, int blocking, 2235 int atomic, int hop) 2236 { 2237 struct snd_seq_client *cptr; 2238 int result; 2239 2240 if (snd_BUG_ON(!ev)) 2241 return -EINVAL; 2242 2243 if (ev->type == SNDRV_SEQ_EVENT_NONE) 2244 return 0; /* ignore this */ 2245 if (ev->type == SNDRV_SEQ_EVENT_KERNEL_ERROR) 2246 return -EINVAL; /* quoted events can't be enqueued */ 2247 2248 /* fill in client number */ 2249 ev->source.client = client; 2250 2251 if (check_event_type_and_length(ev)) 2252 return -EINVAL; 2253 2254 cptr = snd_seq_client_use_ptr(client); 2255 if (cptr == NULL) 2256 return -EINVAL; 2257 2258 if (! cptr->accept_output) 2259 result = -EPERM; 2260 else /* send it */ 2261 result = snd_seq_client_enqueue_event(cptr, ev, file, blocking, 2262 atomic, hop, NULL); 2263 2264 snd_seq_client_unlock(cptr); 2265 return result; 2266 } 2267 2268 /* 2269 * exported, called by kernel clients to enqueue events (w/o blocking) 2270 * 2271 * RETURN VALUE: zero if succeed, negative if error 2272 */ 2273 int snd_seq_kernel_client_enqueue(int client, struct snd_seq_event * ev, 2274 int atomic, int hop) 2275 { 2276 return kernel_client_enqueue(client, ev, NULL, 0, atomic, hop); 2277 } 2278 EXPORT_SYMBOL(snd_seq_kernel_client_enqueue); 2279 2280 /* 2281 * exported, called by kernel clients to enqueue events (with blocking) 2282 * 2283 * RETURN VALUE: zero if succeed, negative if error 2284 */ 2285 int snd_seq_kernel_client_enqueue_blocking(int client, struct snd_seq_event * ev, 2286 struct file *file, 2287 int atomic, int hop) 2288 { 2289 return kernel_client_enqueue(client, ev, file, 1, atomic, hop); 2290 } 2291 EXPORT_SYMBOL(snd_seq_kernel_client_enqueue_blocking); 2292 2293 /* 2294 * exported, called by kernel clients to dispatch events directly to other 2295 * clients, bypassing the queues. Event time-stamp will be updated. 2296 * 2297 * RETURN VALUE: negative = delivery failed, 2298 * zero, or positive: the number of delivered events 2299 */ 2300 int snd_seq_kernel_client_dispatch(int client, struct snd_seq_event * ev, 2301 int atomic, int hop) 2302 { 2303 struct snd_seq_client *cptr; 2304 int result; 2305 2306 if (snd_BUG_ON(!ev)) 2307 return -EINVAL; 2308 2309 /* fill in client number */ 2310 ev->queue = SNDRV_SEQ_QUEUE_DIRECT; 2311 ev->source.client = client; 2312 2313 if (check_event_type_and_length(ev)) 2314 return -EINVAL; 2315 2316 cptr = snd_seq_client_use_ptr(client); 2317 if (cptr == NULL) 2318 return -EINVAL; 2319 2320 if (!cptr->accept_output) 2321 result = -EPERM; 2322 else 2323 result = snd_seq_deliver_event(cptr, ev, atomic, hop); 2324 2325 snd_seq_client_unlock(cptr); 2326 return result; 2327 } 2328 EXPORT_SYMBOL(snd_seq_kernel_client_dispatch); 2329 2330 /** 2331 * snd_seq_kernel_client_ctl - operate a command for a client with data in 2332 * kernel space. 2333 * @clientid: A numerical ID for a client. 2334 * @cmd: An ioctl(2) command for ALSA sequencer operation. 2335 * @arg: A pointer to data in kernel space. 2336 * 2337 * Against its name, both kernel/application client can be handled by this 2338 * kernel API. A pointer of 'arg' argument should be in kernel space. 2339 * 2340 * Return: 0 at success. Negative error code at failure. 2341 */ 2342 int snd_seq_kernel_client_ctl(int clientid, unsigned int cmd, void *arg) 2343 { 2344 const struct ioctl_handler *handler; 2345 struct snd_seq_client *client; 2346 2347 client = clientptr(clientid); 2348 if (client == NULL) 2349 return -ENXIO; 2350 2351 for (handler = ioctl_handlers; handler->cmd > 0; ++handler) { 2352 if (handler->cmd == cmd) 2353 return handler->func(client, arg); 2354 } 2355 2356 pr_debug("ALSA: seq unknown ioctl() 0x%x (type='%c', number=0x%02x)\n", 2357 cmd, _IOC_TYPE(cmd), _IOC_NR(cmd)); 2358 return -ENOTTY; 2359 } 2360 EXPORT_SYMBOL(snd_seq_kernel_client_ctl); 2361 2362 /* exported (for OSS emulator) */ 2363 int snd_seq_kernel_client_write_poll(int clientid, struct file *file, poll_table *wait) 2364 { 2365 struct snd_seq_client *client; 2366 2367 client = clientptr(clientid); 2368 if (client == NULL) 2369 return -ENXIO; 2370 2371 if (! snd_seq_write_pool_allocated(client)) 2372 return 1; 2373 if (snd_seq_pool_poll_wait(client->pool, file, wait)) 2374 return 1; 2375 return 0; 2376 } 2377 EXPORT_SYMBOL(snd_seq_kernel_client_write_poll); 2378 2379 /*---------------------------------------------------------------------------*/ 2380 2381 #ifdef CONFIG_SND_PROC_FS 2382 /* 2383 * /proc interface 2384 */ 2385 static void snd_seq_info_dump_subscribers(struct snd_info_buffer *buffer, 2386 struct snd_seq_port_subs_info *group, 2387 int is_src, char *msg) 2388 { 2389 struct list_head *p; 2390 struct snd_seq_subscribers *s; 2391 int count = 0; 2392 2393 down_read(&group->list_mutex); 2394 if (list_empty(&group->list_head)) { 2395 up_read(&group->list_mutex); 2396 return; 2397 } 2398 snd_iprintf(buffer, msg); 2399 list_for_each(p, &group->list_head) { 2400 if (is_src) 2401 s = list_entry(p, struct snd_seq_subscribers, src_list); 2402 else 2403 s = list_entry(p, struct snd_seq_subscribers, dest_list); 2404 if (count++) 2405 snd_iprintf(buffer, ", "); 2406 snd_iprintf(buffer, "%d:%d", 2407 is_src ? s->info.dest.client : s->info.sender.client, 2408 is_src ? s->info.dest.port : s->info.sender.port); 2409 if (s->info.flags & SNDRV_SEQ_PORT_SUBS_TIMESTAMP) 2410 snd_iprintf(buffer, "[%c:%d]", ((s->info.flags & SNDRV_SEQ_PORT_SUBS_TIME_REAL) ? 'r' : 't'), s->info.queue); 2411 if (group->exclusive) 2412 snd_iprintf(buffer, "[ex]"); 2413 } 2414 up_read(&group->list_mutex); 2415 snd_iprintf(buffer, "\n"); 2416 } 2417 2418 #define FLAG_PERM_RD(perm) ((perm) & SNDRV_SEQ_PORT_CAP_READ ? ((perm) & SNDRV_SEQ_PORT_CAP_SUBS_READ ? 'R' : 'r') : '-') 2419 #define FLAG_PERM_WR(perm) ((perm) & SNDRV_SEQ_PORT_CAP_WRITE ? ((perm) & SNDRV_SEQ_PORT_CAP_SUBS_WRITE ? 'W' : 'w') : '-') 2420 #define FLAG_PERM_EX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_NO_EXPORT ? '-' : 'e') 2421 2422 #define FLAG_PERM_DUPLEX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_DUPLEX ? 'X' : '-') 2423 2424 static void snd_seq_info_dump_ports(struct snd_info_buffer *buffer, 2425 struct snd_seq_client *client) 2426 { 2427 struct snd_seq_client_port *p; 2428 2429 mutex_lock(&client->ports_mutex); 2430 list_for_each_entry(p, &client->ports_list_head, list) { 2431 snd_iprintf(buffer, " Port %3d : \"%s\" (%c%c%c%c)\n", 2432 p->addr.port, p->name, 2433 FLAG_PERM_RD(p->capability), 2434 FLAG_PERM_WR(p->capability), 2435 FLAG_PERM_EX(p->capability), 2436 FLAG_PERM_DUPLEX(p->capability)); 2437 snd_seq_info_dump_subscribers(buffer, &p->c_src, 1, " Connecting To: "); 2438 snd_seq_info_dump_subscribers(buffer, &p->c_dest, 0, " Connected From: "); 2439 } 2440 mutex_unlock(&client->ports_mutex); 2441 } 2442 2443 2444 /* exported to seq_info.c */ 2445 void snd_seq_info_clients_read(struct snd_info_entry *entry, 2446 struct snd_info_buffer *buffer) 2447 { 2448 int c; 2449 struct snd_seq_client *client; 2450 2451 snd_iprintf(buffer, "Client info\n"); 2452 snd_iprintf(buffer, " cur clients : %d\n", client_usage.cur); 2453 snd_iprintf(buffer, " peak clients : %d\n", client_usage.peak); 2454 snd_iprintf(buffer, " max clients : %d\n", SNDRV_SEQ_MAX_CLIENTS); 2455 snd_iprintf(buffer, "\n"); 2456 2457 /* list the client table */ 2458 for (c = 0; c < SNDRV_SEQ_MAX_CLIENTS; c++) { 2459 client = snd_seq_client_use_ptr(c); 2460 if (client == NULL) 2461 continue; 2462 if (client->type == NO_CLIENT) { 2463 snd_seq_client_unlock(client); 2464 continue; 2465 } 2466 2467 snd_iprintf(buffer, "Client %3d : \"%s\" [%s]\n", 2468 c, client->name, 2469 client->type == USER_CLIENT ? "User" : "Kernel"); 2470 snd_seq_info_dump_ports(buffer, client); 2471 if (snd_seq_write_pool_allocated(client)) { 2472 snd_iprintf(buffer, " Output pool :\n"); 2473 snd_seq_info_pool(buffer, client->pool, " "); 2474 } 2475 if (client->type == USER_CLIENT && client->data.user.fifo && 2476 client->data.user.fifo->pool) { 2477 snd_iprintf(buffer, " Input pool :\n"); 2478 snd_seq_info_pool(buffer, client->data.user.fifo->pool, " "); 2479 } 2480 snd_seq_client_unlock(client); 2481 } 2482 } 2483 #endif /* CONFIG_SND_PROC_FS */ 2484 2485 /*---------------------------------------------------------------------------*/ 2486 2487 2488 /* 2489 * REGISTRATION PART 2490 */ 2491 2492 static const struct file_operations snd_seq_f_ops = 2493 { 2494 .owner = THIS_MODULE, 2495 .read = snd_seq_read, 2496 .write = snd_seq_write, 2497 .open = snd_seq_open, 2498 .release = snd_seq_release, 2499 .llseek = no_llseek, 2500 .poll = snd_seq_poll, 2501 .unlocked_ioctl = snd_seq_ioctl, 2502 .compat_ioctl = snd_seq_ioctl_compat, 2503 }; 2504 2505 static struct device seq_dev; 2506 2507 /* 2508 * register sequencer device 2509 */ 2510 int __init snd_sequencer_device_init(void) 2511 { 2512 int err; 2513 2514 snd_device_initialize(&seq_dev, NULL); 2515 dev_set_name(&seq_dev, "seq"); 2516 2517 mutex_lock(®ister_mutex); 2518 err = snd_register_device(SNDRV_DEVICE_TYPE_SEQUENCER, NULL, 0, 2519 &snd_seq_f_ops, NULL, &seq_dev); 2520 mutex_unlock(®ister_mutex); 2521 if (err < 0) { 2522 put_device(&seq_dev); 2523 return err; 2524 } 2525 2526 return 0; 2527 } 2528 2529 2530 2531 /* 2532 * unregister sequencer device 2533 */ 2534 void snd_sequencer_device_done(void) 2535 { 2536 snd_unregister_device(&seq_dev); 2537 put_device(&seq_dev); 2538 } 2539