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 91 static inline mm_segment_t snd_enter_user(void) 92 { 93 mm_segment_t fs = get_fs(); 94 set_fs(get_ds()); 95 return fs; 96 } 97 98 static inline void snd_leave_user(mm_segment_t fs) 99 { 100 set_fs(fs); 101 } 102 103 /* 104 */ 105 static inline unsigned short snd_seq_file_flags(struct file *file) 106 { 107 switch (file->f_mode & (FMODE_READ | FMODE_WRITE)) { 108 case FMODE_WRITE: 109 return SNDRV_SEQ_LFLG_OUTPUT; 110 case FMODE_READ: 111 return SNDRV_SEQ_LFLG_INPUT; 112 default: 113 return SNDRV_SEQ_LFLG_OPEN; 114 } 115 } 116 117 static inline int snd_seq_write_pool_allocated(struct snd_seq_client *client) 118 { 119 return snd_seq_total_cells(client->pool) > 0; 120 } 121 122 /* return pointer to client structure for specified id */ 123 static struct snd_seq_client *clientptr(int clientid) 124 { 125 if (clientid < 0 || clientid >= SNDRV_SEQ_MAX_CLIENTS) { 126 pr_debug("ALSA: seq: oops. Trying to get pointer to client %d\n", 127 clientid); 128 return NULL; 129 } 130 return clienttab[clientid]; 131 } 132 133 struct snd_seq_client *snd_seq_client_use_ptr(int clientid) 134 { 135 unsigned long flags; 136 struct snd_seq_client *client; 137 138 if (clientid < 0 || clientid >= SNDRV_SEQ_MAX_CLIENTS) { 139 pr_debug("ALSA: seq: oops. Trying to get pointer to client %d\n", 140 clientid); 141 return NULL; 142 } 143 spin_lock_irqsave(&clients_lock, flags); 144 client = clientptr(clientid); 145 if (client) 146 goto __lock; 147 if (clienttablock[clientid]) { 148 spin_unlock_irqrestore(&clients_lock, flags); 149 return NULL; 150 } 151 spin_unlock_irqrestore(&clients_lock, flags); 152 #ifdef CONFIG_MODULES 153 if (!in_interrupt()) { 154 static char client_requested[SNDRV_SEQ_GLOBAL_CLIENTS]; 155 static char card_requested[SNDRV_CARDS]; 156 if (clientid < SNDRV_SEQ_GLOBAL_CLIENTS) { 157 int idx; 158 159 if (!client_requested[clientid]) { 160 client_requested[clientid] = 1; 161 for (idx = 0; idx < 15; idx++) { 162 if (seq_client_load[idx] < 0) 163 break; 164 if (seq_client_load[idx] == clientid) { 165 request_module("snd-seq-client-%i", 166 clientid); 167 break; 168 } 169 } 170 } 171 } else if (clientid < SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN) { 172 int card = (clientid - SNDRV_SEQ_GLOBAL_CLIENTS) / 173 SNDRV_SEQ_CLIENTS_PER_CARD; 174 if (card < snd_ecards_limit) { 175 if (! card_requested[card]) { 176 card_requested[card] = 1; 177 snd_request_card(card); 178 } 179 snd_seq_device_load_drivers(); 180 } 181 } 182 spin_lock_irqsave(&clients_lock, flags); 183 client = clientptr(clientid); 184 if (client) 185 goto __lock; 186 spin_unlock_irqrestore(&clients_lock, flags); 187 } 188 #endif 189 return NULL; 190 191 __lock: 192 snd_use_lock_use(&client->use_lock); 193 spin_unlock_irqrestore(&clients_lock, flags); 194 return client; 195 } 196 197 static void usage_alloc(struct snd_seq_usage *res, int num) 198 { 199 res->cur += num; 200 if (res->cur > res->peak) 201 res->peak = res->cur; 202 } 203 204 static void usage_free(struct snd_seq_usage *res, int num) 205 { 206 res->cur -= num; 207 } 208 209 /* initialise data structures */ 210 int __init client_init_data(void) 211 { 212 /* zap out the client table */ 213 memset(&clienttablock, 0, sizeof(clienttablock)); 214 memset(&clienttab, 0, sizeof(clienttab)); 215 return 0; 216 } 217 218 219 static struct snd_seq_client *seq_create_client1(int client_index, int poolsize) 220 { 221 unsigned long flags; 222 int c; 223 struct snd_seq_client *client; 224 225 /* init client data */ 226 client = kzalloc(sizeof(*client), GFP_KERNEL); 227 if (client == NULL) 228 return NULL; 229 client->pool = snd_seq_pool_new(poolsize); 230 if (client->pool == NULL) { 231 kfree(client); 232 return NULL; 233 } 234 client->type = NO_CLIENT; 235 snd_use_lock_init(&client->use_lock); 236 rwlock_init(&client->ports_lock); 237 mutex_init(&client->ports_mutex); 238 INIT_LIST_HEAD(&client->ports_list_head); 239 240 /* find free slot in the client table */ 241 spin_lock_irqsave(&clients_lock, flags); 242 if (client_index < 0) { 243 for (c = SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN; 244 c < SNDRV_SEQ_MAX_CLIENTS; 245 c++) { 246 if (clienttab[c] || clienttablock[c]) 247 continue; 248 clienttab[client->number = c] = client; 249 spin_unlock_irqrestore(&clients_lock, flags); 250 return client; 251 } 252 } else { 253 if (clienttab[client_index] == NULL && !clienttablock[client_index]) { 254 clienttab[client->number = client_index] = client; 255 spin_unlock_irqrestore(&clients_lock, flags); 256 return client; 257 } 258 } 259 spin_unlock_irqrestore(&clients_lock, flags); 260 snd_seq_pool_delete(&client->pool); 261 kfree(client); 262 return NULL; /* no free slot found or busy, return failure code */ 263 } 264 265 266 static int seq_free_client1(struct snd_seq_client *client) 267 { 268 unsigned long flags; 269 270 if (!client) 271 return 0; 272 snd_seq_delete_all_ports(client); 273 snd_seq_queue_client_leave(client->number); 274 spin_lock_irqsave(&clients_lock, flags); 275 clienttablock[client->number] = 1; 276 clienttab[client->number] = NULL; 277 spin_unlock_irqrestore(&clients_lock, flags); 278 snd_use_lock_sync(&client->use_lock); 279 snd_seq_queue_client_termination(client->number); 280 if (client->pool) 281 snd_seq_pool_delete(&client->pool); 282 spin_lock_irqsave(&clients_lock, flags); 283 clienttablock[client->number] = 0; 284 spin_unlock_irqrestore(&clients_lock, flags); 285 return 0; 286 } 287 288 289 static void seq_free_client(struct snd_seq_client * client) 290 { 291 mutex_lock(®ister_mutex); 292 switch (client->type) { 293 case NO_CLIENT: 294 pr_warn("ALSA: seq: Trying to free unused client %d\n", 295 client->number); 296 break; 297 case USER_CLIENT: 298 case KERNEL_CLIENT: 299 seq_free_client1(client); 300 usage_free(&client_usage, 1); 301 break; 302 303 default: 304 pr_err("ALSA: seq: Trying to free client %d with undefined type = %d\n", 305 client->number, client->type); 306 } 307 mutex_unlock(®ister_mutex); 308 309 snd_seq_system_client_ev_client_exit(client->number); 310 } 311 312 313 314 /* -------------------------------------------------------- */ 315 316 /* create a user client */ 317 static int snd_seq_open(struct inode *inode, struct file *file) 318 { 319 int c, mode; /* client id */ 320 struct snd_seq_client *client; 321 struct snd_seq_user_client *user; 322 int err; 323 324 err = nonseekable_open(inode, file); 325 if (err < 0) 326 return err; 327 328 if (mutex_lock_interruptible(®ister_mutex)) 329 return -ERESTARTSYS; 330 client = seq_create_client1(-1, SNDRV_SEQ_DEFAULT_EVENTS); 331 if (client == NULL) { 332 mutex_unlock(®ister_mutex); 333 return -ENOMEM; /* failure code */ 334 } 335 336 mode = snd_seq_file_flags(file); 337 if (mode & SNDRV_SEQ_LFLG_INPUT) 338 client->accept_input = 1; 339 if (mode & SNDRV_SEQ_LFLG_OUTPUT) 340 client->accept_output = 1; 341 342 user = &client->data.user; 343 user->fifo = NULL; 344 user->fifo_pool_size = 0; 345 346 if (mode & SNDRV_SEQ_LFLG_INPUT) { 347 user->fifo_pool_size = SNDRV_SEQ_DEFAULT_CLIENT_EVENTS; 348 user->fifo = snd_seq_fifo_new(user->fifo_pool_size); 349 if (user->fifo == NULL) { 350 seq_free_client1(client); 351 kfree(client); 352 mutex_unlock(®ister_mutex); 353 return -ENOMEM; 354 } 355 } 356 357 usage_alloc(&client_usage, 1); 358 client->type = USER_CLIENT; 359 mutex_unlock(®ister_mutex); 360 361 c = client->number; 362 file->private_data = client; 363 364 /* fill client data */ 365 user->file = file; 366 sprintf(client->name, "Client-%d", c); 367 368 /* make others aware this new client */ 369 snd_seq_system_client_ev_client_start(c); 370 371 return 0; 372 } 373 374 /* delete a user client */ 375 static int snd_seq_release(struct inode *inode, struct file *file) 376 { 377 struct snd_seq_client *client = file->private_data; 378 379 if (client) { 380 seq_free_client(client); 381 if (client->data.user.fifo) 382 snd_seq_fifo_delete(&client->data.user.fifo); 383 kfree(client); 384 } 385 386 return 0; 387 } 388 389 390 /* handle client read() */ 391 /* possible error values: 392 * -ENXIO invalid client or file open mode 393 * -ENOSPC FIFO overflow (the flag is cleared after this error report) 394 * -EINVAL no enough user-space buffer to write the whole event 395 * -EFAULT seg. fault during copy to user space 396 */ 397 static ssize_t snd_seq_read(struct file *file, char __user *buf, size_t count, 398 loff_t *offset) 399 { 400 struct snd_seq_client *client = file->private_data; 401 struct snd_seq_fifo *fifo; 402 int err; 403 long result = 0; 404 struct snd_seq_event_cell *cell; 405 406 if (!(snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_INPUT)) 407 return -ENXIO; 408 409 if (!access_ok(VERIFY_WRITE, buf, count)) 410 return -EFAULT; 411 412 /* check client structures are in place */ 413 if (snd_BUG_ON(!client)) 414 return -ENXIO; 415 416 if (!client->accept_input || (fifo = client->data.user.fifo) == NULL) 417 return -ENXIO; 418 419 if (atomic_read(&fifo->overflow) > 0) { 420 /* buffer overflow is detected */ 421 snd_seq_fifo_clear(fifo); 422 /* return error code */ 423 return -ENOSPC; 424 } 425 426 cell = NULL; 427 err = 0; 428 snd_seq_fifo_lock(fifo); 429 430 /* while data available in queue */ 431 while (count >= sizeof(struct snd_seq_event)) { 432 int nonblock; 433 434 nonblock = (file->f_flags & O_NONBLOCK) || result > 0; 435 if ((err = snd_seq_fifo_cell_out(fifo, &cell, nonblock)) < 0) { 436 break; 437 } 438 if (snd_seq_ev_is_variable(&cell->event)) { 439 struct snd_seq_event tmpev; 440 tmpev = cell->event; 441 tmpev.data.ext.len &= ~SNDRV_SEQ_EXT_MASK; 442 if (copy_to_user(buf, &tmpev, sizeof(struct snd_seq_event))) { 443 err = -EFAULT; 444 break; 445 } 446 count -= sizeof(struct snd_seq_event); 447 buf += sizeof(struct snd_seq_event); 448 err = snd_seq_expand_var_event(&cell->event, count, 449 (char __force *)buf, 0, 450 sizeof(struct snd_seq_event)); 451 if (err < 0) 452 break; 453 result += err; 454 count -= err; 455 buf += err; 456 } else { 457 if (copy_to_user(buf, &cell->event, sizeof(struct snd_seq_event))) { 458 err = -EFAULT; 459 break; 460 } 461 count -= sizeof(struct snd_seq_event); 462 buf += sizeof(struct snd_seq_event); 463 } 464 snd_seq_cell_free(cell); 465 cell = NULL; /* to be sure */ 466 result += sizeof(struct snd_seq_event); 467 } 468 469 if (err < 0) { 470 if (cell) 471 snd_seq_fifo_cell_putback(fifo, cell); 472 if (err == -EAGAIN && result > 0) 473 err = 0; 474 } 475 snd_seq_fifo_unlock(fifo); 476 477 return (err < 0) ? err : result; 478 } 479 480 481 /* 482 * check access permission to the port 483 */ 484 static int check_port_perm(struct snd_seq_client_port *port, unsigned int flags) 485 { 486 if ((port->capability & flags) != flags) 487 return 0; 488 return flags; 489 } 490 491 /* 492 * check if the destination client is available, and return the pointer 493 * if filter is non-zero, client filter bitmap is tested. 494 */ 495 static struct snd_seq_client *get_event_dest_client(struct snd_seq_event *event, 496 int filter) 497 { 498 struct snd_seq_client *dest; 499 500 dest = snd_seq_client_use_ptr(event->dest.client); 501 if (dest == NULL) 502 return NULL; 503 if (! dest->accept_input) 504 goto __not_avail; 505 if ((dest->filter & SNDRV_SEQ_FILTER_USE_EVENT) && 506 ! test_bit(event->type, dest->event_filter)) 507 goto __not_avail; 508 if (filter && !(dest->filter & filter)) 509 goto __not_avail; 510 511 return dest; /* ok - accessible */ 512 __not_avail: 513 snd_seq_client_unlock(dest); 514 return NULL; 515 } 516 517 518 /* 519 * Return the error event. 520 * 521 * If the receiver client is a user client, the original event is 522 * encapsulated in SNDRV_SEQ_EVENT_BOUNCE as variable length event. If 523 * the original event is also variable length, the external data is 524 * copied after the event record. 525 * If the receiver client is a kernel client, the original event is 526 * quoted in SNDRV_SEQ_EVENT_KERNEL_ERROR, since this requires no extra 527 * kmalloc. 528 */ 529 static int bounce_error_event(struct snd_seq_client *client, 530 struct snd_seq_event *event, 531 int err, int atomic, int hop) 532 { 533 struct snd_seq_event bounce_ev; 534 int result; 535 536 if (client == NULL || 537 ! (client->filter & SNDRV_SEQ_FILTER_BOUNCE) || 538 ! client->accept_input) 539 return 0; /* ignored */ 540 541 /* set up quoted error */ 542 memset(&bounce_ev, 0, sizeof(bounce_ev)); 543 bounce_ev.type = SNDRV_SEQ_EVENT_KERNEL_ERROR; 544 bounce_ev.flags = SNDRV_SEQ_EVENT_LENGTH_FIXED; 545 bounce_ev.queue = SNDRV_SEQ_QUEUE_DIRECT; 546 bounce_ev.source.client = SNDRV_SEQ_CLIENT_SYSTEM; 547 bounce_ev.source.port = SNDRV_SEQ_PORT_SYSTEM_ANNOUNCE; 548 bounce_ev.dest.client = client->number; 549 bounce_ev.dest.port = event->source.port; 550 bounce_ev.data.quote.origin = event->dest; 551 bounce_ev.data.quote.event = event; 552 bounce_ev.data.quote.value = -err; /* use positive value */ 553 result = snd_seq_deliver_single_event(NULL, &bounce_ev, 0, atomic, hop + 1); 554 if (result < 0) { 555 client->event_lost++; 556 return result; 557 } 558 559 return result; 560 } 561 562 563 /* 564 * rewrite the time-stamp of the event record with the curren time 565 * of the given queue. 566 * return non-zero if updated. 567 */ 568 static int update_timestamp_of_queue(struct snd_seq_event *event, 569 int queue, int real_time) 570 { 571 struct snd_seq_queue *q; 572 573 q = queueptr(queue); 574 if (! q) 575 return 0; 576 event->queue = queue; 577 event->flags &= ~SNDRV_SEQ_TIME_STAMP_MASK; 578 if (real_time) { 579 event->time.time = snd_seq_timer_get_cur_time(q->timer); 580 event->flags |= SNDRV_SEQ_TIME_STAMP_REAL; 581 } else { 582 event->time.tick = snd_seq_timer_get_cur_tick(q->timer); 583 event->flags |= SNDRV_SEQ_TIME_STAMP_TICK; 584 } 585 queuefree(q); 586 return 1; 587 } 588 589 590 /* 591 * deliver an event to the specified destination. 592 * if filter is non-zero, client filter bitmap is tested. 593 * 594 * RETURN VALUE: 0 : if succeeded 595 * <0 : error 596 */ 597 static int snd_seq_deliver_single_event(struct snd_seq_client *client, 598 struct snd_seq_event *event, 599 int filter, int atomic, int hop) 600 { 601 struct snd_seq_client *dest = NULL; 602 struct snd_seq_client_port *dest_port = NULL; 603 int result = -ENOENT; 604 int direct; 605 606 direct = snd_seq_ev_is_direct(event); 607 608 dest = get_event_dest_client(event, filter); 609 if (dest == NULL) 610 goto __skip; 611 dest_port = snd_seq_port_use_ptr(dest, event->dest.port); 612 if (dest_port == NULL) 613 goto __skip; 614 615 /* check permission */ 616 if (! check_port_perm(dest_port, SNDRV_SEQ_PORT_CAP_WRITE)) { 617 result = -EPERM; 618 goto __skip; 619 } 620 621 if (dest_port->timestamping) 622 update_timestamp_of_queue(event, dest_port->time_queue, 623 dest_port->time_real); 624 625 switch (dest->type) { 626 case USER_CLIENT: 627 if (dest->data.user.fifo) 628 result = snd_seq_fifo_event_in(dest->data.user.fifo, event); 629 break; 630 631 case KERNEL_CLIENT: 632 if (dest_port->event_input == NULL) 633 break; 634 result = dest_port->event_input(event, direct, 635 dest_port->private_data, 636 atomic, hop); 637 break; 638 default: 639 break; 640 } 641 642 __skip: 643 if (dest_port) 644 snd_seq_port_unlock(dest_port); 645 if (dest) 646 snd_seq_client_unlock(dest); 647 648 if (result < 0 && !direct) { 649 result = bounce_error_event(client, event, result, atomic, hop); 650 } 651 return result; 652 } 653 654 655 /* 656 * send the event to all subscribers: 657 */ 658 static int deliver_to_subscribers(struct snd_seq_client *client, 659 struct snd_seq_event *event, 660 int atomic, int hop) 661 { 662 struct snd_seq_subscribers *subs; 663 int err = 0, num_ev = 0; 664 struct snd_seq_event event_saved; 665 struct snd_seq_client_port *src_port; 666 struct snd_seq_port_subs_info *grp; 667 668 src_port = snd_seq_port_use_ptr(client, event->source.port); 669 if (src_port == NULL) 670 return -EINVAL; /* invalid source port */ 671 /* save original event record */ 672 event_saved = *event; 673 grp = &src_port->c_src; 674 675 /* lock list */ 676 if (atomic) 677 read_lock(&grp->list_lock); 678 else 679 down_read(&grp->list_mutex); 680 list_for_each_entry(subs, &grp->list_head, src_list) { 681 event->dest = subs->info.dest; 682 if (subs->info.flags & SNDRV_SEQ_PORT_SUBS_TIMESTAMP) 683 /* convert time according to flag with subscription */ 684 update_timestamp_of_queue(event, subs->info.queue, 685 subs->info.flags & SNDRV_SEQ_PORT_SUBS_TIME_REAL); 686 err = snd_seq_deliver_single_event(client, event, 687 0, atomic, hop); 688 if (err < 0) 689 break; 690 num_ev++; 691 /* restore original event record */ 692 *event = event_saved; 693 } 694 if (atomic) 695 read_unlock(&grp->list_lock); 696 else 697 up_read(&grp->list_mutex); 698 *event = event_saved; /* restore */ 699 snd_seq_port_unlock(src_port); 700 return (err < 0) ? err : num_ev; 701 } 702 703 704 #ifdef SUPPORT_BROADCAST 705 /* 706 * broadcast to all ports: 707 */ 708 static int port_broadcast_event(struct snd_seq_client *client, 709 struct snd_seq_event *event, 710 int atomic, int hop) 711 { 712 int num_ev = 0, err = 0; 713 struct snd_seq_client *dest_client; 714 struct snd_seq_client_port *port; 715 716 dest_client = get_event_dest_client(event, SNDRV_SEQ_FILTER_BROADCAST); 717 if (dest_client == NULL) 718 return 0; /* no matching destination */ 719 720 read_lock(&dest_client->ports_lock); 721 list_for_each_entry(port, &dest_client->ports_list_head, list) { 722 event->dest.port = port->addr.port; 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++; 730 } 731 read_unlock(&dest_client->ports_lock); 732 snd_seq_client_unlock(dest_client); 733 event->dest.port = SNDRV_SEQ_ADDRESS_BROADCAST; /* restore */ 734 return (err < 0) ? err : num_ev; 735 } 736 737 /* 738 * send the event to all clients: 739 * if destination port is also ADDRESS_BROADCAST, deliver to all ports. 740 */ 741 static int broadcast_event(struct snd_seq_client *client, 742 struct snd_seq_event *event, int atomic, int hop) 743 { 744 int err = 0, num_ev = 0; 745 int dest; 746 struct snd_seq_addr addr; 747 748 addr = event->dest; /* save */ 749 750 for (dest = 0; dest < SNDRV_SEQ_MAX_CLIENTS; dest++) { 751 /* don't send to itself */ 752 if (dest == client->number) 753 continue; 754 event->dest.client = dest; 755 event->dest.port = addr.port; 756 if (addr.port == SNDRV_SEQ_ADDRESS_BROADCAST) 757 err = port_broadcast_event(client, event, atomic, hop); 758 else 759 /* pass NULL as source client to avoid error bounce */ 760 err = snd_seq_deliver_single_event(NULL, event, 761 SNDRV_SEQ_FILTER_BROADCAST, 762 atomic, hop); 763 if (err < 0) 764 break; 765 num_ev += err; 766 } 767 event->dest = addr; /* restore */ 768 return (err < 0) ? err : num_ev; 769 } 770 771 772 /* multicast - not supported yet */ 773 static int multicast_event(struct snd_seq_client *client, struct snd_seq_event *event, 774 int atomic, int hop) 775 { 776 pr_debug("ALSA: seq: multicast not supported yet.\n"); 777 return 0; /* ignored */ 778 } 779 #endif /* SUPPORT_BROADCAST */ 780 781 782 /* deliver an event to the destination port(s). 783 * if the event is to subscribers or broadcast, the event is dispatched 784 * to multiple targets. 785 * 786 * RETURN VALUE: n > 0 : the number of delivered events. 787 * n == 0 : the event was not passed to any client. 788 * n < 0 : error - event was not processed. 789 */ 790 static int snd_seq_deliver_event(struct snd_seq_client *client, struct snd_seq_event *event, 791 int atomic, int hop) 792 { 793 int result; 794 795 hop++; 796 if (hop >= SNDRV_SEQ_MAX_HOPS) { 797 pr_debug("ALSA: seq: too long delivery path (%d:%d->%d:%d)\n", 798 event->source.client, event->source.port, 799 event->dest.client, event->dest.port); 800 return -EMLINK; 801 } 802 803 if (event->queue == SNDRV_SEQ_ADDRESS_SUBSCRIBERS || 804 event->dest.client == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) 805 result = deliver_to_subscribers(client, event, atomic, hop); 806 #ifdef SUPPORT_BROADCAST 807 else if (event->queue == SNDRV_SEQ_ADDRESS_BROADCAST || 808 event->dest.client == SNDRV_SEQ_ADDRESS_BROADCAST) 809 result = broadcast_event(client, event, atomic, hop); 810 else if (event->dest.client >= SNDRV_SEQ_MAX_CLIENTS) 811 result = multicast_event(client, event, atomic, hop); 812 else if (event->dest.port == SNDRV_SEQ_ADDRESS_BROADCAST) 813 result = port_broadcast_event(client, event, atomic, hop); 814 #endif 815 else 816 result = snd_seq_deliver_single_event(client, event, 0, atomic, hop); 817 818 return result; 819 } 820 821 /* 822 * dispatch an event cell: 823 * This function is called only from queue check routines in timer 824 * interrupts or after enqueued. 825 * The event cell shall be released or re-queued in this function. 826 * 827 * RETURN VALUE: n > 0 : the number of delivered events. 828 * n == 0 : the event was not passed to any client. 829 * n < 0 : error - event was not processed. 830 */ 831 int snd_seq_dispatch_event(struct snd_seq_event_cell *cell, int atomic, int hop) 832 { 833 struct snd_seq_client *client; 834 int result; 835 836 if (snd_BUG_ON(!cell)) 837 return -EINVAL; 838 839 client = snd_seq_client_use_ptr(cell->event.source.client); 840 if (client == NULL) { 841 snd_seq_cell_free(cell); /* release this cell */ 842 return -EINVAL; 843 } 844 845 if (cell->event.type == SNDRV_SEQ_EVENT_NOTE) { 846 /* NOTE event: 847 * the event cell is re-used as a NOTE-OFF event and 848 * enqueued again. 849 */ 850 struct snd_seq_event tmpev, *ev; 851 852 /* reserve this event to enqueue note-off later */ 853 tmpev = cell->event; 854 tmpev.type = SNDRV_SEQ_EVENT_NOTEON; 855 result = snd_seq_deliver_event(client, &tmpev, atomic, hop); 856 857 /* 858 * This was originally a note event. We now re-use the 859 * cell for the note-off event. 860 */ 861 862 ev = &cell->event; 863 ev->type = SNDRV_SEQ_EVENT_NOTEOFF; 864 ev->flags |= SNDRV_SEQ_PRIORITY_HIGH; 865 866 /* add the duration time */ 867 switch (ev->flags & SNDRV_SEQ_TIME_STAMP_MASK) { 868 case SNDRV_SEQ_TIME_STAMP_TICK: 869 ev->time.tick += ev->data.note.duration; 870 break; 871 case SNDRV_SEQ_TIME_STAMP_REAL: 872 /* unit for duration is ms */ 873 ev->time.time.tv_nsec += 1000000 * (ev->data.note.duration % 1000); 874 ev->time.time.tv_sec += ev->data.note.duration / 1000 + 875 ev->time.time.tv_nsec / 1000000000; 876 ev->time.time.tv_nsec %= 1000000000; 877 break; 878 } 879 ev->data.note.velocity = ev->data.note.off_velocity; 880 881 /* Now queue this cell as the note off event */ 882 if (snd_seq_enqueue_event(cell, atomic, hop) < 0) 883 snd_seq_cell_free(cell); /* release this cell */ 884 885 } else { 886 /* Normal events: 887 * event cell is freed after processing the event 888 */ 889 890 result = snd_seq_deliver_event(client, &cell->event, atomic, hop); 891 snd_seq_cell_free(cell); 892 } 893 894 snd_seq_client_unlock(client); 895 return result; 896 } 897 898 899 /* Allocate a cell from client pool and enqueue it to queue: 900 * if pool is empty and blocking is TRUE, sleep until a new cell is 901 * available. 902 */ 903 static int snd_seq_client_enqueue_event(struct snd_seq_client *client, 904 struct snd_seq_event *event, 905 struct file *file, int blocking, 906 int atomic, int hop) 907 { 908 struct snd_seq_event_cell *cell; 909 int err; 910 911 /* special queue values - force direct passing */ 912 if (event->queue == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) { 913 event->dest.client = SNDRV_SEQ_ADDRESS_SUBSCRIBERS; 914 event->queue = SNDRV_SEQ_QUEUE_DIRECT; 915 } else 916 #ifdef SUPPORT_BROADCAST 917 if (event->queue == SNDRV_SEQ_ADDRESS_BROADCAST) { 918 event->dest.client = SNDRV_SEQ_ADDRESS_BROADCAST; 919 event->queue = SNDRV_SEQ_QUEUE_DIRECT; 920 } 921 #endif 922 if (event->dest.client == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) { 923 /* check presence of source port */ 924 struct snd_seq_client_port *src_port = snd_seq_port_use_ptr(client, event->source.port); 925 if (src_port == NULL) 926 return -EINVAL; 927 snd_seq_port_unlock(src_port); 928 } 929 930 /* direct event processing without enqueued */ 931 if (snd_seq_ev_is_direct(event)) { 932 if (event->type == SNDRV_SEQ_EVENT_NOTE) 933 return -EINVAL; /* this event must be enqueued! */ 934 return snd_seq_deliver_event(client, event, atomic, hop); 935 } 936 937 /* Not direct, normal queuing */ 938 if (snd_seq_queue_is_used(event->queue, client->number) <= 0) 939 return -EINVAL; /* invalid queue */ 940 if (! snd_seq_write_pool_allocated(client)) 941 return -ENXIO; /* queue is not allocated */ 942 943 /* allocate an event cell */ 944 err = snd_seq_event_dup(client->pool, event, &cell, !blocking || atomic, file); 945 if (err < 0) 946 return err; 947 948 /* we got a cell. enqueue it. */ 949 if ((err = snd_seq_enqueue_event(cell, atomic, hop)) < 0) { 950 snd_seq_cell_free(cell); 951 return err; 952 } 953 954 return 0; 955 } 956 957 958 /* 959 * check validity of event type and data length. 960 * return non-zero if invalid. 961 */ 962 static int check_event_type_and_length(struct snd_seq_event *ev) 963 { 964 switch (snd_seq_ev_length_type(ev)) { 965 case SNDRV_SEQ_EVENT_LENGTH_FIXED: 966 if (snd_seq_ev_is_variable_type(ev)) 967 return -EINVAL; 968 break; 969 case SNDRV_SEQ_EVENT_LENGTH_VARIABLE: 970 if (! snd_seq_ev_is_variable_type(ev) || 971 (ev->data.ext.len & ~SNDRV_SEQ_EXT_MASK) >= SNDRV_SEQ_MAX_EVENT_LEN) 972 return -EINVAL; 973 break; 974 case SNDRV_SEQ_EVENT_LENGTH_VARUSR: 975 if (! snd_seq_ev_is_direct(ev)) 976 return -EINVAL; 977 break; 978 } 979 return 0; 980 } 981 982 983 /* handle write() */ 984 /* possible error values: 985 * -ENXIO invalid client or file open mode 986 * -ENOMEM malloc failed 987 * -EFAULT seg. fault during copy from user space 988 * -EINVAL invalid event 989 * -EAGAIN no space in output pool 990 * -EINTR interrupts while sleep 991 * -EMLINK too many hops 992 * others depends on return value from driver callback 993 */ 994 static ssize_t snd_seq_write(struct file *file, const char __user *buf, 995 size_t count, loff_t *offset) 996 { 997 struct snd_seq_client *client = file->private_data; 998 int written = 0, len; 999 int err = -EINVAL; 1000 struct snd_seq_event event; 1001 1002 if (!(snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT)) 1003 return -ENXIO; 1004 1005 /* check client structures are in place */ 1006 if (snd_BUG_ON(!client)) 1007 return -ENXIO; 1008 1009 if (!client->accept_output || client->pool == NULL) 1010 return -ENXIO; 1011 1012 /* allocate the pool now if the pool is not allocated yet */ 1013 if (client->pool->size > 0 && !snd_seq_write_pool_allocated(client)) { 1014 if (snd_seq_pool_init(client->pool) < 0) 1015 return -ENOMEM; 1016 } 1017 1018 /* only process whole events */ 1019 while (count >= sizeof(struct snd_seq_event)) { 1020 /* Read in the event header from the user */ 1021 len = sizeof(event); 1022 if (copy_from_user(&event, buf, len)) { 1023 err = -EFAULT; 1024 break; 1025 } 1026 event.source.client = client->number; /* fill in client number */ 1027 /* Check for extension data length */ 1028 if (check_event_type_and_length(&event)) { 1029 err = -EINVAL; 1030 break; 1031 } 1032 1033 /* check for special events */ 1034 if (event.type == SNDRV_SEQ_EVENT_NONE) 1035 goto __skip_event; 1036 else if (snd_seq_ev_is_reserved(&event)) { 1037 err = -EINVAL; 1038 break; 1039 } 1040 1041 if (snd_seq_ev_is_variable(&event)) { 1042 int extlen = event.data.ext.len & ~SNDRV_SEQ_EXT_MASK; 1043 if ((size_t)(extlen + len) > count) { 1044 /* back out, will get an error this time or next */ 1045 err = -EINVAL; 1046 break; 1047 } 1048 /* set user space pointer */ 1049 event.data.ext.len = extlen | SNDRV_SEQ_EXT_USRPTR; 1050 event.data.ext.ptr = (char __force *)buf 1051 + sizeof(struct snd_seq_event); 1052 len += extlen; /* increment data length */ 1053 } else { 1054 #ifdef CONFIG_COMPAT 1055 if (client->convert32 && snd_seq_ev_is_varusr(&event)) { 1056 void *ptr = (void __force *)compat_ptr(event.data.raw32.d[1]); 1057 event.data.ext.ptr = ptr; 1058 } 1059 #endif 1060 } 1061 1062 /* ok, enqueue it */ 1063 err = snd_seq_client_enqueue_event(client, &event, file, 1064 !(file->f_flags & O_NONBLOCK), 1065 0, 0); 1066 if (err < 0) 1067 break; 1068 1069 __skip_event: 1070 /* Update pointers and counts */ 1071 count -= len; 1072 buf += len; 1073 written += len; 1074 } 1075 1076 return written ? written : err; 1077 } 1078 1079 1080 /* 1081 * handle polling 1082 */ 1083 static unsigned int snd_seq_poll(struct file *file, poll_table * wait) 1084 { 1085 struct snd_seq_client *client = file->private_data; 1086 unsigned int mask = 0; 1087 1088 /* check client structures are in place */ 1089 if (snd_BUG_ON(!client)) 1090 return -ENXIO; 1091 1092 if ((snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_INPUT) && 1093 client->data.user.fifo) { 1094 1095 /* check if data is available in the outqueue */ 1096 if (snd_seq_fifo_poll_wait(client->data.user.fifo, file, wait)) 1097 mask |= POLLIN | POLLRDNORM; 1098 } 1099 1100 if (snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT) { 1101 1102 /* check if data is available in the pool */ 1103 if (!snd_seq_write_pool_allocated(client) || 1104 snd_seq_pool_poll_wait(client->pool, file, wait)) 1105 mask |= POLLOUT | POLLWRNORM; 1106 } 1107 1108 return mask; 1109 } 1110 1111 1112 /*-----------------------------------------------------*/ 1113 1114 1115 /* SYSTEM_INFO ioctl() */ 1116 static int snd_seq_ioctl_system_info(struct snd_seq_client *client, void __user *arg) 1117 { 1118 struct snd_seq_system_info info; 1119 1120 memset(&info, 0, sizeof(info)); 1121 /* fill the info fields */ 1122 info.queues = SNDRV_SEQ_MAX_QUEUES; 1123 info.clients = SNDRV_SEQ_MAX_CLIENTS; 1124 info.ports = 256; /* fixed limit */ 1125 info.channels = 256; /* fixed limit */ 1126 info.cur_clients = client_usage.cur; 1127 info.cur_queues = snd_seq_queue_get_cur_queues(); 1128 1129 if (copy_to_user(arg, &info, sizeof(info))) 1130 return -EFAULT; 1131 return 0; 1132 } 1133 1134 1135 /* RUNNING_MODE ioctl() */ 1136 static int snd_seq_ioctl_running_mode(struct snd_seq_client *client, void __user *arg) 1137 { 1138 struct snd_seq_running_info info; 1139 struct snd_seq_client *cptr; 1140 int err = 0; 1141 1142 if (copy_from_user(&info, arg, sizeof(info))) 1143 return -EFAULT; 1144 1145 /* requested client number */ 1146 cptr = snd_seq_client_use_ptr(info.client); 1147 if (cptr == NULL) 1148 return -ENOENT; /* don't change !!! */ 1149 1150 #ifdef SNDRV_BIG_ENDIAN 1151 if (! info.big_endian) { 1152 err = -EINVAL; 1153 goto __err; 1154 } 1155 #else 1156 if (info.big_endian) { 1157 err = -EINVAL; 1158 goto __err; 1159 } 1160 1161 #endif 1162 if (info.cpu_mode > sizeof(long)) { 1163 err = -EINVAL; 1164 goto __err; 1165 } 1166 cptr->convert32 = (info.cpu_mode < sizeof(long)); 1167 __err: 1168 snd_seq_client_unlock(cptr); 1169 return err; 1170 } 1171 1172 /* CLIENT_INFO ioctl() */ 1173 static void get_client_info(struct snd_seq_client *cptr, 1174 struct snd_seq_client_info *info) 1175 { 1176 info->client = cptr->number; 1177 1178 /* fill the info fields */ 1179 info->type = cptr->type; 1180 strcpy(info->name, cptr->name); 1181 info->filter = cptr->filter; 1182 info->event_lost = cptr->event_lost; 1183 memcpy(info->event_filter, cptr->event_filter, 32); 1184 info->num_ports = cptr->num_ports; 1185 memset(info->reserved, 0, sizeof(info->reserved)); 1186 } 1187 1188 static int snd_seq_ioctl_get_client_info(struct snd_seq_client *client, 1189 void __user *arg) 1190 { 1191 struct snd_seq_client *cptr; 1192 struct snd_seq_client_info client_info; 1193 1194 if (copy_from_user(&client_info, arg, sizeof(client_info))) 1195 return -EFAULT; 1196 1197 /* requested client number */ 1198 cptr = snd_seq_client_use_ptr(client_info.client); 1199 if (cptr == NULL) 1200 return -ENOENT; /* don't change !!! */ 1201 1202 get_client_info(cptr, &client_info); 1203 snd_seq_client_unlock(cptr); 1204 1205 if (copy_to_user(arg, &client_info, sizeof(client_info))) 1206 return -EFAULT; 1207 return 0; 1208 } 1209 1210 1211 /* CLIENT_INFO ioctl() */ 1212 static int snd_seq_ioctl_set_client_info(struct snd_seq_client *client, 1213 void __user *arg) 1214 { 1215 struct snd_seq_client_info client_info; 1216 1217 if (copy_from_user(&client_info, arg, sizeof(client_info))) 1218 return -EFAULT; 1219 1220 /* it is not allowed to set the info fields for an another client */ 1221 if (client->number != client_info.client) 1222 return -EPERM; 1223 /* also client type must be set now */ 1224 if (client->type != client_info.type) 1225 return -EINVAL; 1226 1227 /* fill the info fields */ 1228 if (client_info.name[0]) 1229 strlcpy(client->name, client_info.name, sizeof(client->name)); 1230 1231 client->filter = client_info.filter; 1232 client->event_lost = client_info.event_lost; 1233 memcpy(client->event_filter, client_info.event_filter, 32); 1234 1235 return 0; 1236 } 1237 1238 1239 /* 1240 * CREATE PORT ioctl() 1241 */ 1242 static int snd_seq_ioctl_create_port(struct snd_seq_client *client, 1243 void __user *arg) 1244 { 1245 struct snd_seq_client_port *port; 1246 struct snd_seq_port_info info; 1247 struct snd_seq_port_callback *callback; 1248 1249 if (copy_from_user(&info, arg, sizeof(info))) 1250 return -EFAULT; 1251 1252 /* it is not allowed to create the port for an another client */ 1253 if (info.addr.client != client->number) 1254 return -EPERM; 1255 1256 port = snd_seq_create_port(client, (info.flags & SNDRV_SEQ_PORT_FLG_GIVEN_PORT) ? info.addr.port : -1); 1257 if (port == NULL) 1258 return -ENOMEM; 1259 1260 if (client->type == USER_CLIENT && info.kernel) { 1261 snd_seq_delete_port(client, port->addr.port); 1262 return -EINVAL; 1263 } 1264 if (client->type == KERNEL_CLIENT) { 1265 if ((callback = info.kernel) != NULL) { 1266 if (callback->owner) 1267 port->owner = callback->owner; 1268 port->private_data = callback->private_data; 1269 port->private_free = callback->private_free; 1270 port->callback_all = callback->callback_all; 1271 port->event_input = callback->event_input; 1272 port->c_src.open = callback->subscribe; 1273 port->c_src.close = callback->unsubscribe; 1274 port->c_dest.open = callback->use; 1275 port->c_dest.close = callback->unuse; 1276 } 1277 } 1278 1279 info.addr = port->addr; 1280 1281 snd_seq_set_port_info(port, &info); 1282 snd_seq_system_client_ev_port_start(port->addr.client, port->addr.port); 1283 1284 if (copy_to_user(arg, &info, sizeof(info))) 1285 return -EFAULT; 1286 1287 return 0; 1288 } 1289 1290 /* 1291 * DELETE PORT ioctl() 1292 */ 1293 static int snd_seq_ioctl_delete_port(struct snd_seq_client *client, 1294 void __user *arg) 1295 { 1296 struct snd_seq_port_info info; 1297 int err; 1298 1299 /* set passed parameters */ 1300 if (copy_from_user(&info, arg, sizeof(info))) 1301 return -EFAULT; 1302 1303 /* it is not allowed to remove the port for an another client */ 1304 if (info.addr.client != client->number) 1305 return -EPERM; 1306 1307 err = snd_seq_delete_port(client, info.addr.port); 1308 if (err >= 0) 1309 snd_seq_system_client_ev_port_exit(client->number, info.addr.port); 1310 return err; 1311 } 1312 1313 1314 /* 1315 * GET_PORT_INFO ioctl() (on any client) 1316 */ 1317 static int snd_seq_ioctl_get_port_info(struct snd_seq_client *client, 1318 void __user *arg) 1319 { 1320 struct snd_seq_client *cptr; 1321 struct snd_seq_client_port *port; 1322 struct snd_seq_port_info info; 1323 1324 if (copy_from_user(&info, arg, sizeof(info))) 1325 return -EFAULT; 1326 cptr = snd_seq_client_use_ptr(info.addr.client); 1327 if (cptr == NULL) 1328 return -ENXIO; 1329 1330 port = snd_seq_port_use_ptr(cptr, info.addr.port); 1331 if (port == NULL) { 1332 snd_seq_client_unlock(cptr); 1333 return -ENOENT; /* don't change */ 1334 } 1335 1336 /* get port info */ 1337 snd_seq_get_port_info(port, &info); 1338 snd_seq_port_unlock(port); 1339 snd_seq_client_unlock(cptr); 1340 1341 if (copy_to_user(arg, &info, sizeof(info))) 1342 return -EFAULT; 1343 return 0; 1344 } 1345 1346 1347 /* 1348 * SET_PORT_INFO ioctl() (only ports on this/own client) 1349 */ 1350 static int snd_seq_ioctl_set_port_info(struct snd_seq_client *client, 1351 void __user *arg) 1352 { 1353 struct snd_seq_client_port *port; 1354 struct snd_seq_port_info info; 1355 1356 if (copy_from_user(&info, arg, sizeof(info))) 1357 return -EFAULT; 1358 1359 if (info.addr.client != client->number) /* only set our own ports ! */ 1360 return -EPERM; 1361 port = snd_seq_port_use_ptr(client, info.addr.port); 1362 if (port) { 1363 snd_seq_set_port_info(port, &info); 1364 snd_seq_port_unlock(port); 1365 } 1366 return 0; 1367 } 1368 1369 1370 /* 1371 * port subscription (connection) 1372 */ 1373 #define PERM_RD (SNDRV_SEQ_PORT_CAP_READ|SNDRV_SEQ_PORT_CAP_SUBS_READ) 1374 #define PERM_WR (SNDRV_SEQ_PORT_CAP_WRITE|SNDRV_SEQ_PORT_CAP_SUBS_WRITE) 1375 1376 static int check_subscription_permission(struct snd_seq_client *client, 1377 struct snd_seq_client_port *sport, 1378 struct snd_seq_client_port *dport, 1379 struct snd_seq_port_subscribe *subs) 1380 { 1381 if (client->number != subs->sender.client && 1382 client->number != subs->dest.client) { 1383 /* connection by third client - check export permission */ 1384 if (check_port_perm(sport, SNDRV_SEQ_PORT_CAP_NO_EXPORT)) 1385 return -EPERM; 1386 if (check_port_perm(dport, SNDRV_SEQ_PORT_CAP_NO_EXPORT)) 1387 return -EPERM; 1388 } 1389 1390 /* check read permission */ 1391 /* if sender or receiver is the subscribing client itself, 1392 * no permission check is necessary 1393 */ 1394 if (client->number != subs->sender.client) { 1395 if (! check_port_perm(sport, PERM_RD)) 1396 return -EPERM; 1397 } 1398 /* check write permission */ 1399 if (client->number != subs->dest.client) { 1400 if (! check_port_perm(dport, PERM_WR)) 1401 return -EPERM; 1402 } 1403 return 0; 1404 } 1405 1406 /* 1407 * send an subscription notify event to user client: 1408 * client must be user client. 1409 */ 1410 int snd_seq_client_notify_subscription(int client, int port, 1411 struct snd_seq_port_subscribe *info, 1412 int evtype) 1413 { 1414 struct snd_seq_event event; 1415 1416 memset(&event, 0, sizeof(event)); 1417 event.type = evtype; 1418 event.data.connect.dest = info->dest; 1419 event.data.connect.sender = info->sender; 1420 1421 return snd_seq_system_notify(client, port, &event); /* non-atomic */ 1422 } 1423 1424 1425 /* 1426 * add to port's subscription list IOCTL interface 1427 */ 1428 static int snd_seq_ioctl_subscribe_port(struct snd_seq_client *client, 1429 void __user *arg) 1430 { 1431 int result = -EINVAL; 1432 struct snd_seq_client *receiver = NULL, *sender = NULL; 1433 struct snd_seq_client_port *sport = NULL, *dport = NULL; 1434 struct snd_seq_port_subscribe subs; 1435 1436 if (copy_from_user(&subs, arg, sizeof(subs))) 1437 return -EFAULT; 1438 1439 if ((receiver = snd_seq_client_use_ptr(subs.dest.client)) == NULL) 1440 goto __end; 1441 if ((sender = snd_seq_client_use_ptr(subs.sender.client)) == NULL) 1442 goto __end; 1443 if ((sport = snd_seq_port_use_ptr(sender, subs.sender.port)) == NULL) 1444 goto __end; 1445 if ((dport = snd_seq_port_use_ptr(receiver, subs.dest.port)) == NULL) 1446 goto __end; 1447 1448 result = check_subscription_permission(client, sport, dport, &subs); 1449 if (result < 0) 1450 goto __end; 1451 1452 /* connect them */ 1453 result = snd_seq_port_connect(client, sender, sport, receiver, dport, &subs); 1454 if (! result) /* broadcast announce */ 1455 snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0, 1456 &subs, SNDRV_SEQ_EVENT_PORT_SUBSCRIBED); 1457 __end: 1458 if (sport) 1459 snd_seq_port_unlock(sport); 1460 if (dport) 1461 snd_seq_port_unlock(dport); 1462 if (sender) 1463 snd_seq_client_unlock(sender); 1464 if (receiver) 1465 snd_seq_client_unlock(receiver); 1466 return result; 1467 } 1468 1469 1470 /* 1471 * remove from port's subscription list 1472 */ 1473 static int snd_seq_ioctl_unsubscribe_port(struct snd_seq_client *client, 1474 void __user *arg) 1475 { 1476 int result = -ENXIO; 1477 struct snd_seq_client *receiver = NULL, *sender = NULL; 1478 struct snd_seq_client_port *sport = NULL, *dport = NULL; 1479 struct snd_seq_port_subscribe subs; 1480 1481 if (copy_from_user(&subs, arg, sizeof(subs))) 1482 return -EFAULT; 1483 1484 if ((receiver = snd_seq_client_use_ptr(subs.dest.client)) == NULL) 1485 goto __end; 1486 if ((sender = snd_seq_client_use_ptr(subs.sender.client)) == NULL) 1487 goto __end; 1488 if ((sport = snd_seq_port_use_ptr(sender, subs.sender.port)) == NULL) 1489 goto __end; 1490 if ((dport = snd_seq_port_use_ptr(receiver, subs.dest.port)) == NULL) 1491 goto __end; 1492 1493 result = check_subscription_permission(client, sport, dport, &subs); 1494 if (result < 0) 1495 goto __end; 1496 1497 result = snd_seq_port_disconnect(client, sender, sport, receiver, dport, &subs); 1498 if (! result) /* broadcast announce */ 1499 snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0, 1500 &subs, SNDRV_SEQ_EVENT_PORT_UNSUBSCRIBED); 1501 __end: 1502 if (sport) 1503 snd_seq_port_unlock(sport); 1504 if (dport) 1505 snd_seq_port_unlock(dport); 1506 if (sender) 1507 snd_seq_client_unlock(sender); 1508 if (receiver) 1509 snd_seq_client_unlock(receiver); 1510 return result; 1511 } 1512 1513 1514 /* CREATE_QUEUE ioctl() */ 1515 static int snd_seq_ioctl_create_queue(struct snd_seq_client *client, 1516 void __user *arg) 1517 { 1518 struct snd_seq_queue_info info; 1519 int result; 1520 struct snd_seq_queue *q; 1521 1522 if (copy_from_user(&info, arg, sizeof(info))) 1523 return -EFAULT; 1524 1525 result = snd_seq_queue_alloc(client->number, info.locked, info.flags); 1526 if (result < 0) 1527 return result; 1528 1529 q = queueptr(result); 1530 if (q == NULL) 1531 return -EINVAL; 1532 1533 info.queue = q->queue; 1534 info.locked = q->locked; 1535 info.owner = q->owner; 1536 1537 /* set queue name */ 1538 if (! info.name[0]) 1539 snprintf(info.name, sizeof(info.name), "Queue-%d", q->queue); 1540 strlcpy(q->name, info.name, sizeof(q->name)); 1541 queuefree(q); 1542 1543 if (copy_to_user(arg, &info, sizeof(info))) 1544 return -EFAULT; 1545 1546 return 0; 1547 } 1548 1549 /* DELETE_QUEUE ioctl() */ 1550 static int snd_seq_ioctl_delete_queue(struct snd_seq_client *client, 1551 void __user *arg) 1552 { 1553 struct snd_seq_queue_info info; 1554 1555 if (copy_from_user(&info, arg, sizeof(info))) 1556 return -EFAULT; 1557 1558 return snd_seq_queue_delete(client->number, info.queue); 1559 } 1560 1561 /* GET_QUEUE_INFO ioctl() */ 1562 static int snd_seq_ioctl_get_queue_info(struct snd_seq_client *client, 1563 void __user *arg) 1564 { 1565 struct snd_seq_queue_info info; 1566 struct snd_seq_queue *q; 1567 1568 if (copy_from_user(&info, arg, sizeof(info))) 1569 return -EFAULT; 1570 1571 q = queueptr(info.queue); 1572 if (q == NULL) 1573 return -EINVAL; 1574 1575 memset(&info, 0, sizeof(info)); 1576 info.queue = q->queue; 1577 info.owner = q->owner; 1578 info.locked = q->locked; 1579 strlcpy(info.name, q->name, sizeof(info.name)); 1580 queuefree(q); 1581 1582 if (copy_to_user(arg, &info, sizeof(info))) 1583 return -EFAULT; 1584 1585 return 0; 1586 } 1587 1588 /* SET_QUEUE_INFO ioctl() */ 1589 static int snd_seq_ioctl_set_queue_info(struct snd_seq_client *client, 1590 void __user *arg) 1591 { 1592 struct snd_seq_queue_info info; 1593 struct snd_seq_queue *q; 1594 1595 if (copy_from_user(&info, arg, sizeof(info))) 1596 return -EFAULT; 1597 1598 if (info.owner != client->number) 1599 return -EINVAL; 1600 1601 /* change owner/locked permission */ 1602 if (snd_seq_queue_check_access(info.queue, client->number)) { 1603 if (snd_seq_queue_set_owner(info.queue, client->number, info.locked) < 0) 1604 return -EPERM; 1605 if (info.locked) 1606 snd_seq_queue_use(info.queue, client->number, 1); 1607 } else { 1608 return -EPERM; 1609 } 1610 1611 q = queueptr(info.queue); 1612 if (! q) 1613 return -EINVAL; 1614 if (q->owner != client->number) { 1615 queuefree(q); 1616 return -EPERM; 1617 } 1618 strlcpy(q->name, info.name, sizeof(q->name)); 1619 queuefree(q); 1620 1621 return 0; 1622 } 1623 1624 /* GET_NAMED_QUEUE ioctl() */ 1625 static int snd_seq_ioctl_get_named_queue(struct snd_seq_client *client, void __user *arg) 1626 { 1627 struct snd_seq_queue_info info; 1628 struct snd_seq_queue *q; 1629 1630 if (copy_from_user(&info, arg, sizeof(info))) 1631 return -EFAULT; 1632 1633 q = snd_seq_queue_find_name(info.name); 1634 if (q == NULL) 1635 return -EINVAL; 1636 info.queue = q->queue; 1637 info.owner = q->owner; 1638 info.locked = q->locked; 1639 queuefree(q); 1640 1641 if (copy_to_user(arg, &info, sizeof(info))) 1642 return -EFAULT; 1643 1644 return 0; 1645 } 1646 1647 /* GET_QUEUE_STATUS ioctl() */ 1648 static int snd_seq_ioctl_get_queue_status(struct snd_seq_client *client, 1649 void __user *arg) 1650 { 1651 struct snd_seq_queue_status status; 1652 struct snd_seq_queue *queue; 1653 struct snd_seq_timer *tmr; 1654 1655 if (copy_from_user(&status, arg, sizeof(status))) 1656 return -EFAULT; 1657 1658 queue = queueptr(status.queue); 1659 if (queue == NULL) 1660 return -EINVAL; 1661 memset(&status, 0, sizeof(status)); 1662 status.queue = queue->queue; 1663 1664 tmr = queue->timer; 1665 status.events = queue->tickq->cells + queue->timeq->cells; 1666 1667 status.time = snd_seq_timer_get_cur_time(tmr); 1668 status.tick = snd_seq_timer_get_cur_tick(tmr); 1669 1670 status.running = tmr->running; 1671 1672 status.flags = queue->flags; 1673 queuefree(queue); 1674 1675 if (copy_to_user(arg, &status, sizeof(status))) 1676 return -EFAULT; 1677 return 0; 1678 } 1679 1680 1681 /* GET_QUEUE_TEMPO ioctl() */ 1682 static int snd_seq_ioctl_get_queue_tempo(struct snd_seq_client *client, 1683 void __user *arg) 1684 { 1685 struct snd_seq_queue_tempo tempo; 1686 struct snd_seq_queue *queue; 1687 struct snd_seq_timer *tmr; 1688 1689 if (copy_from_user(&tempo, arg, sizeof(tempo))) 1690 return -EFAULT; 1691 1692 queue = queueptr(tempo.queue); 1693 if (queue == NULL) 1694 return -EINVAL; 1695 memset(&tempo, 0, sizeof(tempo)); 1696 tempo.queue = queue->queue; 1697 1698 tmr = queue->timer; 1699 1700 tempo.tempo = tmr->tempo; 1701 tempo.ppq = tmr->ppq; 1702 tempo.skew_value = tmr->skew; 1703 tempo.skew_base = tmr->skew_base; 1704 queuefree(queue); 1705 1706 if (copy_to_user(arg, &tempo, sizeof(tempo))) 1707 return -EFAULT; 1708 return 0; 1709 } 1710 1711 1712 /* SET_QUEUE_TEMPO ioctl() */ 1713 int snd_seq_set_queue_tempo(int client, struct snd_seq_queue_tempo *tempo) 1714 { 1715 if (!snd_seq_queue_check_access(tempo->queue, client)) 1716 return -EPERM; 1717 return snd_seq_queue_timer_set_tempo(tempo->queue, client, tempo); 1718 } 1719 1720 EXPORT_SYMBOL(snd_seq_set_queue_tempo); 1721 1722 static int snd_seq_ioctl_set_queue_tempo(struct snd_seq_client *client, 1723 void __user *arg) 1724 { 1725 int result; 1726 struct snd_seq_queue_tempo tempo; 1727 1728 if (copy_from_user(&tempo, arg, sizeof(tempo))) 1729 return -EFAULT; 1730 1731 result = snd_seq_set_queue_tempo(client->number, &tempo); 1732 return result < 0 ? result : 0; 1733 } 1734 1735 1736 /* GET_QUEUE_TIMER ioctl() */ 1737 static int snd_seq_ioctl_get_queue_timer(struct snd_seq_client *client, 1738 void __user *arg) 1739 { 1740 struct snd_seq_queue_timer timer; 1741 struct snd_seq_queue *queue; 1742 struct snd_seq_timer *tmr; 1743 1744 if (copy_from_user(&timer, arg, sizeof(timer))) 1745 return -EFAULT; 1746 1747 queue = queueptr(timer.queue); 1748 if (queue == NULL) 1749 return -EINVAL; 1750 1751 if (mutex_lock_interruptible(&queue->timer_mutex)) { 1752 queuefree(queue); 1753 return -ERESTARTSYS; 1754 } 1755 tmr = queue->timer; 1756 memset(&timer, 0, sizeof(timer)); 1757 timer.queue = queue->queue; 1758 1759 timer.type = tmr->type; 1760 if (tmr->type == SNDRV_SEQ_TIMER_ALSA) { 1761 timer.u.alsa.id = tmr->alsa_id; 1762 timer.u.alsa.resolution = tmr->preferred_resolution; 1763 } 1764 mutex_unlock(&queue->timer_mutex); 1765 queuefree(queue); 1766 1767 if (copy_to_user(arg, &timer, sizeof(timer))) 1768 return -EFAULT; 1769 return 0; 1770 } 1771 1772 1773 /* SET_QUEUE_TIMER ioctl() */ 1774 static int snd_seq_ioctl_set_queue_timer(struct snd_seq_client *client, 1775 void __user *arg) 1776 { 1777 int result = 0; 1778 struct snd_seq_queue_timer timer; 1779 1780 if (copy_from_user(&timer, arg, sizeof(timer))) 1781 return -EFAULT; 1782 1783 if (timer.type != SNDRV_SEQ_TIMER_ALSA) 1784 return -EINVAL; 1785 1786 if (snd_seq_queue_check_access(timer.queue, client->number)) { 1787 struct snd_seq_queue *q; 1788 struct snd_seq_timer *tmr; 1789 1790 q = queueptr(timer.queue); 1791 if (q == NULL) 1792 return -ENXIO; 1793 if (mutex_lock_interruptible(&q->timer_mutex)) { 1794 queuefree(q); 1795 return -ERESTARTSYS; 1796 } 1797 tmr = q->timer; 1798 snd_seq_queue_timer_close(timer.queue); 1799 tmr->type = timer.type; 1800 if (tmr->type == SNDRV_SEQ_TIMER_ALSA) { 1801 tmr->alsa_id = timer.u.alsa.id; 1802 tmr->preferred_resolution = timer.u.alsa.resolution; 1803 } 1804 result = snd_seq_queue_timer_open(timer.queue); 1805 mutex_unlock(&q->timer_mutex); 1806 queuefree(q); 1807 } else { 1808 return -EPERM; 1809 } 1810 1811 return result; 1812 } 1813 1814 1815 /* GET_QUEUE_CLIENT ioctl() */ 1816 static int snd_seq_ioctl_get_queue_client(struct snd_seq_client *client, 1817 void __user *arg) 1818 { 1819 struct snd_seq_queue_client info; 1820 int used; 1821 1822 if (copy_from_user(&info, arg, sizeof(info))) 1823 return -EFAULT; 1824 1825 used = snd_seq_queue_is_used(info.queue, client->number); 1826 if (used < 0) 1827 return -EINVAL; 1828 info.used = used; 1829 info.client = client->number; 1830 1831 if (copy_to_user(arg, &info, sizeof(info))) 1832 return -EFAULT; 1833 return 0; 1834 } 1835 1836 1837 /* SET_QUEUE_CLIENT ioctl() */ 1838 static int snd_seq_ioctl_set_queue_client(struct snd_seq_client *client, 1839 void __user *arg) 1840 { 1841 int err; 1842 struct snd_seq_queue_client info; 1843 1844 if (copy_from_user(&info, arg, sizeof(info))) 1845 return -EFAULT; 1846 1847 if (info.used >= 0) { 1848 err = snd_seq_queue_use(info.queue, client->number, info.used); 1849 if (err < 0) 1850 return err; 1851 } 1852 1853 return snd_seq_ioctl_get_queue_client(client, arg); 1854 } 1855 1856 1857 /* GET_CLIENT_POOL ioctl() */ 1858 static int snd_seq_ioctl_get_client_pool(struct snd_seq_client *client, 1859 void __user *arg) 1860 { 1861 struct snd_seq_client_pool info; 1862 struct snd_seq_client *cptr; 1863 1864 if (copy_from_user(&info, arg, sizeof(info))) 1865 return -EFAULT; 1866 1867 cptr = snd_seq_client_use_ptr(info.client); 1868 if (cptr == NULL) 1869 return -ENOENT; 1870 memset(&info, 0, sizeof(info)); 1871 info.output_pool = cptr->pool->size; 1872 info.output_room = cptr->pool->room; 1873 info.output_free = info.output_pool; 1874 info.output_free = snd_seq_unused_cells(cptr->pool); 1875 if (cptr->type == USER_CLIENT) { 1876 info.input_pool = cptr->data.user.fifo_pool_size; 1877 info.input_free = info.input_pool; 1878 if (cptr->data.user.fifo) 1879 info.input_free = snd_seq_unused_cells(cptr->data.user.fifo->pool); 1880 } else { 1881 info.input_pool = 0; 1882 info.input_free = 0; 1883 } 1884 snd_seq_client_unlock(cptr); 1885 1886 if (copy_to_user(arg, &info, sizeof(info))) 1887 return -EFAULT; 1888 return 0; 1889 } 1890 1891 /* SET_CLIENT_POOL ioctl() */ 1892 static int snd_seq_ioctl_set_client_pool(struct snd_seq_client *client, 1893 void __user *arg) 1894 { 1895 struct snd_seq_client_pool info; 1896 int rc; 1897 1898 if (copy_from_user(&info, arg, sizeof(info))) 1899 return -EFAULT; 1900 1901 if (client->number != info.client) 1902 return -EINVAL; /* can't change other clients */ 1903 1904 if (info.output_pool >= 1 && info.output_pool <= SNDRV_SEQ_MAX_EVENTS && 1905 (! snd_seq_write_pool_allocated(client) || 1906 info.output_pool != client->pool->size)) { 1907 if (snd_seq_write_pool_allocated(client)) { 1908 /* remove all existing cells */ 1909 snd_seq_queue_client_leave_cells(client->number); 1910 snd_seq_pool_done(client->pool); 1911 } 1912 client->pool->size = info.output_pool; 1913 rc = snd_seq_pool_init(client->pool); 1914 if (rc < 0) 1915 return rc; 1916 } 1917 if (client->type == USER_CLIENT && client->data.user.fifo != NULL && 1918 info.input_pool >= 1 && 1919 info.input_pool <= SNDRV_SEQ_MAX_CLIENT_EVENTS && 1920 info.input_pool != client->data.user.fifo_pool_size) { 1921 /* change pool size */ 1922 rc = snd_seq_fifo_resize(client->data.user.fifo, info.input_pool); 1923 if (rc < 0) 1924 return rc; 1925 client->data.user.fifo_pool_size = info.input_pool; 1926 } 1927 if (info.output_room >= 1 && 1928 info.output_room <= client->pool->size) { 1929 client->pool->room = info.output_room; 1930 } 1931 1932 return snd_seq_ioctl_get_client_pool(client, arg); 1933 } 1934 1935 1936 /* REMOVE_EVENTS ioctl() */ 1937 static int snd_seq_ioctl_remove_events(struct snd_seq_client *client, 1938 void __user *arg) 1939 { 1940 struct snd_seq_remove_events info; 1941 1942 if (copy_from_user(&info, arg, sizeof(info))) 1943 return -EFAULT; 1944 1945 /* 1946 * Input mostly not implemented XXX. 1947 */ 1948 if (info.remove_mode & SNDRV_SEQ_REMOVE_INPUT) { 1949 /* 1950 * No restrictions so for a user client we can clear 1951 * the whole fifo 1952 */ 1953 if (client->type == USER_CLIENT) 1954 snd_seq_fifo_clear(client->data.user.fifo); 1955 } 1956 1957 if (info.remove_mode & SNDRV_SEQ_REMOVE_OUTPUT) 1958 snd_seq_queue_remove_cells(client->number, &info); 1959 1960 return 0; 1961 } 1962 1963 1964 /* 1965 * get subscription info 1966 */ 1967 static int snd_seq_ioctl_get_subscription(struct snd_seq_client *client, 1968 void __user *arg) 1969 { 1970 int result; 1971 struct snd_seq_client *sender = NULL; 1972 struct snd_seq_client_port *sport = NULL; 1973 struct snd_seq_port_subscribe subs; 1974 struct snd_seq_subscribers *p; 1975 1976 if (copy_from_user(&subs, arg, sizeof(subs))) 1977 return -EFAULT; 1978 1979 result = -EINVAL; 1980 if ((sender = snd_seq_client_use_ptr(subs.sender.client)) == NULL) 1981 goto __end; 1982 if ((sport = snd_seq_port_use_ptr(sender, subs.sender.port)) == NULL) 1983 goto __end; 1984 p = snd_seq_port_get_subscription(&sport->c_src, &subs.dest); 1985 if (p) { 1986 result = 0; 1987 subs = p->info; 1988 } else 1989 result = -ENOENT; 1990 1991 __end: 1992 if (sport) 1993 snd_seq_port_unlock(sport); 1994 if (sender) 1995 snd_seq_client_unlock(sender); 1996 if (result >= 0) { 1997 if (copy_to_user(arg, &subs, sizeof(subs))) 1998 return -EFAULT; 1999 } 2000 return result; 2001 } 2002 2003 2004 /* 2005 * get subscription info - check only its presence 2006 */ 2007 static int snd_seq_ioctl_query_subs(struct snd_seq_client *client, 2008 void __user *arg) 2009 { 2010 int result = -ENXIO; 2011 struct snd_seq_client *cptr = NULL; 2012 struct snd_seq_client_port *port = NULL; 2013 struct snd_seq_query_subs subs; 2014 struct snd_seq_port_subs_info *group; 2015 struct list_head *p; 2016 int i; 2017 2018 if (copy_from_user(&subs, arg, sizeof(subs))) 2019 return -EFAULT; 2020 2021 if ((cptr = snd_seq_client_use_ptr(subs.root.client)) == NULL) 2022 goto __end; 2023 if ((port = snd_seq_port_use_ptr(cptr, subs.root.port)) == NULL) 2024 goto __end; 2025 2026 switch (subs.type) { 2027 case SNDRV_SEQ_QUERY_SUBS_READ: 2028 group = &port->c_src; 2029 break; 2030 case SNDRV_SEQ_QUERY_SUBS_WRITE: 2031 group = &port->c_dest; 2032 break; 2033 default: 2034 goto __end; 2035 } 2036 2037 down_read(&group->list_mutex); 2038 /* search for the subscriber */ 2039 subs.num_subs = group->count; 2040 i = 0; 2041 result = -ENOENT; 2042 list_for_each(p, &group->list_head) { 2043 if (i++ == subs.index) { 2044 /* found! */ 2045 struct snd_seq_subscribers *s; 2046 if (subs.type == SNDRV_SEQ_QUERY_SUBS_READ) { 2047 s = list_entry(p, struct snd_seq_subscribers, src_list); 2048 subs.addr = s->info.dest; 2049 } else { 2050 s = list_entry(p, struct snd_seq_subscribers, dest_list); 2051 subs.addr = s->info.sender; 2052 } 2053 subs.flags = s->info.flags; 2054 subs.queue = s->info.queue; 2055 result = 0; 2056 break; 2057 } 2058 } 2059 up_read(&group->list_mutex); 2060 2061 __end: 2062 if (port) 2063 snd_seq_port_unlock(port); 2064 if (cptr) 2065 snd_seq_client_unlock(cptr); 2066 if (result >= 0) { 2067 if (copy_to_user(arg, &subs, sizeof(subs))) 2068 return -EFAULT; 2069 } 2070 return result; 2071 } 2072 2073 2074 /* 2075 * query next client 2076 */ 2077 static int snd_seq_ioctl_query_next_client(struct snd_seq_client *client, 2078 void __user *arg) 2079 { 2080 struct snd_seq_client *cptr = NULL; 2081 struct snd_seq_client_info info; 2082 2083 if (copy_from_user(&info, arg, sizeof(info))) 2084 return -EFAULT; 2085 2086 /* search for next client */ 2087 info.client++; 2088 if (info.client < 0) 2089 info.client = 0; 2090 for (; info.client < SNDRV_SEQ_MAX_CLIENTS; info.client++) { 2091 cptr = snd_seq_client_use_ptr(info.client); 2092 if (cptr) 2093 break; /* found */ 2094 } 2095 if (cptr == NULL) 2096 return -ENOENT; 2097 2098 get_client_info(cptr, &info); 2099 snd_seq_client_unlock(cptr); 2100 2101 if (copy_to_user(arg, &info, sizeof(info))) 2102 return -EFAULT; 2103 return 0; 2104 } 2105 2106 /* 2107 * query next port 2108 */ 2109 static int snd_seq_ioctl_query_next_port(struct snd_seq_client *client, 2110 void __user *arg) 2111 { 2112 struct snd_seq_client *cptr; 2113 struct snd_seq_client_port *port = NULL; 2114 struct snd_seq_port_info info; 2115 2116 if (copy_from_user(&info, arg, sizeof(info))) 2117 return -EFAULT; 2118 cptr = snd_seq_client_use_ptr(info.addr.client); 2119 if (cptr == NULL) 2120 return -ENXIO; 2121 2122 /* search for next port */ 2123 info.addr.port++; 2124 port = snd_seq_port_query_nearest(cptr, &info); 2125 if (port == NULL) { 2126 snd_seq_client_unlock(cptr); 2127 return -ENOENT; 2128 } 2129 2130 /* get port info */ 2131 info.addr = port->addr; 2132 snd_seq_get_port_info(port, &info); 2133 snd_seq_port_unlock(port); 2134 snd_seq_client_unlock(cptr); 2135 2136 if (copy_to_user(arg, &info, sizeof(info))) 2137 return -EFAULT; 2138 return 0; 2139 } 2140 2141 /* -------------------------------------------------------- */ 2142 2143 static struct seq_ioctl_table { 2144 unsigned int cmd; 2145 int (*func)(struct snd_seq_client *client, void __user * arg); 2146 } ioctl_tables[] = { 2147 { SNDRV_SEQ_IOCTL_SYSTEM_INFO, snd_seq_ioctl_system_info }, 2148 { SNDRV_SEQ_IOCTL_RUNNING_MODE, snd_seq_ioctl_running_mode }, 2149 { SNDRV_SEQ_IOCTL_GET_CLIENT_INFO, snd_seq_ioctl_get_client_info }, 2150 { SNDRV_SEQ_IOCTL_SET_CLIENT_INFO, snd_seq_ioctl_set_client_info }, 2151 { SNDRV_SEQ_IOCTL_CREATE_PORT, snd_seq_ioctl_create_port }, 2152 { SNDRV_SEQ_IOCTL_DELETE_PORT, snd_seq_ioctl_delete_port }, 2153 { SNDRV_SEQ_IOCTL_GET_PORT_INFO, snd_seq_ioctl_get_port_info }, 2154 { SNDRV_SEQ_IOCTL_SET_PORT_INFO, snd_seq_ioctl_set_port_info }, 2155 { SNDRV_SEQ_IOCTL_SUBSCRIBE_PORT, snd_seq_ioctl_subscribe_port }, 2156 { SNDRV_SEQ_IOCTL_UNSUBSCRIBE_PORT, snd_seq_ioctl_unsubscribe_port }, 2157 { SNDRV_SEQ_IOCTL_CREATE_QUEUE, snd_seq_ioctl_create_queue }, 2158 { SNDRV_SEQ_IOCTL_DELETE_QUEUE, snd_seq_ioctl_delete_queue }, 2159 { SNDRV_SEQ_IOCTL_GET_QUEUE_INFO, snd_seq_ioctl_get_queue_info }, 2160 { SNDRV_SEQ_IOCTL_SET_QUEUE_INFO, snd_seq_ioctl_set_queue_info }, 2161 { SNDRV_SEQ_IOCTL_GET_NAMED_QUEUE, snd_seq_ioctl_get_named_queue }, 2162 { SNDRV_SEQ_IOCTL_GET_QUEUE_STATUS, snd_seq_ioctl_get_queue_status }, 2163 { SNDRV_SEQ_IOCTL_GET_QUEUE_TEMPO, snd_seq_ioctl_get_queue_tempo }, 2164 { SNDRV_SEQ_IOCTL_SET_QUEUE_TEMPO, snd_seq_ioctl_set_queue_tempo }, 2165 { SNDRV_SEQ_IOCTL_GET_QUEUE_TIMER, snd_seq_ioctl_get_queue_timer }, 2166 { SNDRV_SEQ_IOCTL_SET_QUEUE_TIMER, snd_seq_ioctl_set_queue_timer }, 2167 { SNDRV_SEQ_IOCTL_GET_QUEUE_CLIENT, snd_seq_ioctl_get_queue_client }, 2168 { SNDRV_SEQ_IOCTL_SET_QUEUE_CLIENT, snd_seq_ioctl_set_queue_client }, 2169 { SNDRV_SEQ_IOCTL_GET_CLIENT_POOL, snd_seq_ioctl_get_client_pool }, 2170 { SNDRV_SEQ_IOCTL_SET_CLIENT_POOL, snd_seq_ioctl_set_client_pool }, 2171 { SNDRV_SEQ_IOCTL_GET_SUBSCRIPTION, snd_seq_ioctl_get_subscription }, 2172 { SNDRV_SEQ_IOCTL_QUERY_NEXT_CLIENT, snd_seq_ioctl_query_next_client }, 2173 { SNDRV_SEQ_IOCTL_QUERY_NEXT_PORT, snd_seq_ioctl_query_next_port }, 2174 { SNDRV_SEQ_IOCTL_REMOVE_EVENTS, snd_seq_ioctl_remove_events }, 2175 { SNDRV_SEQ_IOCTL_QUERY_SUBS, snd_seq_ioctl_query_subs }, 2176 { 0, NULL }, 2177 }; 2178 2179 static int snd_seq_do_ioctl(struct snd_seq_client *client, unsigned int cmd, 2180 void __user *arg) 2181 { 2182 struct seq_ioctl_table *p; 2183 2184 switch (cmd) { 2185 case SNDRV_SEQ_IOCTL_PVERSION: 2186 /* return sequencer version number */ 2187 return put_user(SNDRV_SEQ_VERSION, (int __user *)arg) ? -EFAULT : 0; 2188 case SNDRV_SEQ_IOCTL_CLIENT_ID: 2189 /* return the id of this client */ 2190 return put_user(client->number, (int __user *)arg) ? -EFAULT : 0; 2191 } 2192 2193 if (! arg) 2194 return -EFAULT; 2195 for (p = ioctl_tables; p->cmd; p++) { 2196 if (p->cmd == cmd) 2197 return p->func(client, arg); 2198 } 2199 pr_debug("ALSA: seq unknown ioctl() 0x%x (type='%c', number=0x%02x)\n", 2200 cmd, _IOC_TYPE(cmd), _IOC_NR(cmd)); 2201 return -ENOTTY; 2202 } 2203 2204 2205 static long snd_seq_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 2206 { 2207 struct snd_seq_client *client = file->private_data; 2208 2209 if (snd_BUG_ON(!client)) 2210 return -ENXIO; 2211 2212 return snd_seq_do_ioctl(client, cmd, (void __user *) arg); 2213 } 2214 2215 #ifdef CONFIG_COMPAT 2216 #include "seq_compat.c" 2217 #else 2218 #define snd_seq_ioctl_compat NULL 2219 #endif 2220 2221 /* -------------------------------------------------------- */ 2222 2223 2224 /* exported to kernel modules */ 2225 int snd_seq_create_kernel_client(struct snd_card *card, int client_index, 2226 const char *name_fmt, ...) 2227 { 2228 struct snd_seq_client *client; 2229 va_list args; 2230 2231 if (snd_BUG_ON(in_interrupt())) 2232 return -EBUSY; 2233 2234 if (card && client_index >= SNDRV_SEQ_CLIENTS_PER_CARD) 2235 return -EINVAL; 2236 if (card == NULL && client_index >= SNDRV_SEQ_GLOBAL_CLIENTS) 2237 return -EINVAL; 2238 2239 if (mutex_lock_interruptible(®ister_mutex)) 2240 return -ERESTARTSYS; 2241 2242 if (card) { 2243 client_index += SNDRV_SEQ_GLOBAL_CLIENTS 2244 + card->number * SNDRV_SEQ_CLIENTS_PER_CARD; 2245 if (client_index >= SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN) 2246 client_index = -1; 2247 } 2248 2249 /* empty write queue as default */ 2250 client = seq_create_client1(client_index, 0); 2251 if (client == NULL) { 2252 mutex_unlock(®ister_mutex); 2253 return -EBUSY; /* failure code */ 2254 } 2255 usage_alloc(&client_usage, 1); 2256 2257 client->accept_input = 1; 2258 client->accept_output = 1; 2259 2260 va_start(args, name_fmt); 2261 vsnprintf(client->name, sizeof(client->name), name_fmt, args); 2262 va_end(args); 2263 2264 client->type = KERNEL_CLIENT; 2265 mutex_unlock(®ister_mutex); 2266 2267 /* make others aware this new client */ 2268 snd_seq_system_client_ev_client_start(client->number); 2269 2270 /* return client number to caller */ 2271 return client->number; 2272 } 2273 2274 EXPORT_SYMBOL(snd_seq_create_kernel_client); 2275 2276 /* exported to kernel modules */ 2277 int snd_seq_delete_kernel_client(int client) 2278 { 2279 struct snd_seq_client *ptr; 2280 2281 if (snd_BUG_ON(in_interrupt())) 2282 return -EBUSY; 2283 2284 ptr = clientptr(client); 2285 if (ptr == NULL) 2286 return -EINVAL; 2287 2288 seq_free_client(ptr); 2289 kfree(ptr); 2290 return 0; 2291 } 2292 2293 EXPORT_SYMBOL(snd_seq_delete_kernel_client); 2294 2295 /* skeleton to enqueue event, called from snd_seq_kernel_client_enqueue 2296 * and snd_seq_kernel_client_enqueue_blocking 2297 */ 2298 static int kernel_client_enqueue(int client, struct snd_seq_event *ev, 2299 struct file *file, int blocking, 2300 int atomic, int hop) 2301 { 2302 struct snd_seq_client *cptr; 2303 int result; 2304 2305 if (snd_BUG_ON(!ev)) 2306 return -EINVAL; 2307 2308 if (ev->type == SNDRV_SEQ_EVENT_NONE) 2309 return 0; /* ignore this */ 2310 if (ev->type == SNDRV_SEQ_EVENT_KERNEL_ERROR) 2311 return -EINVAL; /* quoted events can't be enqueued */ 2312 2313 /* fill in client number */ 2314 ev->source.client = client; 2315 2316 if (check_event_type_and_length(ev)) 2317 return -EINVAL; 2318 2319 cptr = snd_seq_client_use_ptr(client); 2320 if (cptr == NULL) 2321 return -EINVAL; 2322 2323 if (! cptr->accept_output) 2324 result = -EPERM; 2325 else /* send it */ 2326 result = snd_seq_client_enqueue_event(cptr, ev, file, blocking, atomic, hop); 2327 2328 snd_seq_client_unlock(cptr); 2329 return result; 2330 } 2331 2332 /* 2333 * exported, called by kernel clients to enqueue events (w/o blocking) 2334 * 2335 * RETURN VALUE: zero if succeed, negative if error 2336 */ 2337 int snd_seq_kernel_client_enqueue(int client, struct snd_seq_event * ev, 2338 int atomic, int hop) 2339 { 2340 return kernel_client_enqueue(client, ev, NULL, 0, atomic, hop); 2341 } 2342 2343 EXPORT_SYMBOL(snd_seq_kernel_client_enqueue); 2344 2345 /* 2346 * exported, called by kernel clients to enqueue events (with blocking) 2347 * 2348 * RETURN VALUE: zero if succeed, negative if error 2349 */ 2350 int snd_seq_kernel_client_enqueue_blocking(int client, struct snd_seq_event * ev, 2351 struct file *file, 2352 int atomic, int hop) 2353 { 2354 return kernel_client_enqueue(client, ev, file, 1, atomic, hop); 2355 } 2356 2357 EXPORT_SYMBOL(snd_seq_kernel_client_enqueue_blocking); 2358 2359 /* 2360 * exported, called by kernel clients to dispatch events directly to other 2361 * clients, bypassing the queues. Event time-stamp will be updated. 2362 * 2363 * RETURN VALUE: negative = delivery failed, 2364 * zero, or positive: the number of delivered events 2365 */ 2366 int snd_seq_kernel_client_dispatch(int client, struct snd_seq_event * ev, 2367 int atomic, int hop) 2368 { 2369 struct snd_seq_client *cptr; 2370 int result; 2371 2372 if (snd_BUG_ON(!ev)) 2373 return -EINVAL; 2374 2375 /* fill in client number */ 2376 ev->queue = SNDRV_SEQ_QUEUE_DIRECT; 2377 ev->source.client = client; 2378 2379 if (check_event_type_and_length(ev)) 2380 return -EINVAL; 2381 2382 cptr = snd_seq_client_use_ptr(client); 2383 if (cptr == NULL) 2384 return -EINVAL; 2385 2386 if (!cptr->accept_output) 2387 result = -EPERM; 2388 else 2389 result = snd_seq_deliver_event(cptr, ev, atomic, hop); 2390 2391 snd_seq_client_unlock(cptr); 2392 return result; 2393 } 2394 2395 EXPORT_SYMBOL(snd_seq_kernel_client_dispatch); 2396 2397 /* 2398 * exported, called by kernel clients to perform same functions as with 2399 * userland ioctl() 2400 */ 2401 int snd_seq_kernel_client_ctl(int clientid, unsigned int cmd, void *arg) 2402 { 2403 struct snd_seq_client *client; 2404 mm_segment_t fs; 2405 int result; 2406 2407 client = clientptr(clientid); 2408 if (client == NULL) 2409 return -ENXIO; 2410 fs = snd_enter_user(); 2411 result = snd_seq_do_ioctl(client, cmd, (void __force __user *)arg); 2412 snd_leave_user(fs); 2413 return result; 2414 } 2415 2416 EXPORT_SYMBOL(snd_seq_kernel_client_ctl); 2417 2418 /* exported (for OSS emulator) */ 2419 int snd_seq_kernel_client_write_poll(int clientid, struct file *file, poll_table *wait) 2420 { 2421 struct snd_seq_client *client; 2422 2423 client = clientptr(clientid); 2424 if (client == NULL) 2425 return -ENXIO; 2426 2427 if (! snd_seq_write_pool_allocated(client)) 2428 return 1; 2429 if (snd_seq_pool_poll_wait(client->pool, file, wait)) 2430 return 1; 2431 return 0; 2432 } 2433 2434 EXPORT_SYMBOL(snd_seq_kernel_client_write_poll); 2435 2436 /*---------------------------------------------------------------------------*/ 2437 2438 #ifdef CONFIG_PROC_FS 2439 /* 2440 * /proc interface 2441 */ 2442 static void snd_seq_info_dump_subscribers(struct snd_info_buffer *buffer, 2443 struct snd_seq_port_subs_info *group, 2444 int is_src, char *msg) 2445 { 2446 struct list_head *p; 2447 struct snd_seq_subscribers *s; 2448 int count = 0; 2449 2450 down_read(&group->list_mutex); 2451 if (list_empty(&group->list_head)) { 2452 up_read(&group->list_mutex); 2453 return; 2454 } 2455 snd_iprintf(buffer, msg); 2456 list_for_each(p, &group->list_head) { 2457 if (is_src) 2458 s = list_entry(p, struct snd_seq_subscribers, src_list); 2459 else 2460 s = list_entry(p, struct snd_seq_subscribers, dest_list); 2461 if (count++) 2462 snd_iprintf(buffer, ", "); 2463 snd_iprintf(buffer, "%d:%d", 2464 is_src ? s->info.dest.client : s->info.sender.client, 2465 is_src ? s->info.dest.port : s->info.sender.port); 2466 if (s->info.flags & SNDRV_SEQ_PORT_SUBS_TIMESTAMP) 2467 snd_iprintf(buffer, "[%c:%d]", ((s->info.flags & SNDRV_SEQ_PORT_SUBS_TIME_REAL) ? 'r' : 't'), s->info.queue); 2468 if (group->exclusive) 2469 snd_iprintf(buffer, "[ex]"); 2470 } 2471 up_read(&group->list_mutex); 2472 snd_iprintf(buffer, "\n"); 2473 } 2474 2475 #define FLAG_PERM_RD(perm) ((perm) & SNDRV_SEQ_PORT_CAP_READ ? ((perm) & SNDRV_SEQ_PORT_CAP_SUBS_READ ? 'R' : 'r') : '-') 2476 #define FLAG_PERM_WR(perm) ((perm) & SNDRV_SEQ_PORT_CAP_WRITE ? ((perm) & SNDRV_SEQ_PORT_CAP_SUBS_WRITE ? 'W' : 'w') : '-') 2477 #define FLAG_PERM_EX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_NO_EXPORT ? '-' : 'e') 2478 2479 #define FLAG_PERM_DUPLEX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_DUPLEX ? 'X' : '-') 2480 2481 static void snd_seq_info_dump_ports(struct snd_info_buffer *buffer, 2482 struct snd_seq_client *client) 2483 { 2484 struct snd_seq_client_port *p; 2485 2486 mutex_lock(&client->ports_mutex); 2487 list_for_each_entry(p, &client->ports_list_head, list) { 2488 snd_iprintf(buffer, " Port %3d : \"%s\" (%c%c%c%c)\n", 2489 p->addr.port, p->name, 2490 FLAG_PERM_RD(p->capability), 2491 FLAG_PERM_WR(p->capability), 2492 FLAG_PERM_EX(p->capability), 2493 FLAG_PERM_DUPLEX(p->capability)); 2494 snd_seq_info_dump_subscribers(buffer, &p->c_src, 1, " Connecting To: "); 2495 snd_seq_info_dump_subscribers(buffer, &p->c_dest, 0, " Connected From: "); 2496 } 2497 mutex_unlock(&client->ports_mutex); 2498 } 2499 2500 2501 /* exported to seq_info.c */ 2502 void snd_seq_info_clients_read(struct snd_info_entry *entry, 2503 struct snd_info_buffer *buffer) 2504 { 2505 int c; 2506 struct snd_seq_client *client; 2507 2508 snd_iprintf(buffer, "Client info\n"); 2509 snd_iprintf(buffer, " cur clients : %d\n", client_usage.cur); 2510 snd_iprintf(buffer, " peak clients : %d\n", client_usage.peak); 2511 snd_iprintf(buffer, " max clients : %d\n", SNDRV_SEQ_MAX_CLIENTS); 2512 snd_iprintf(buffer, "\n"); 2513 2514 /* list the client table */ 2515 for (c = 0; c < SNDRV_SEQ_MAX_CLIENTS; c++) { 2516 client = snd_seq_client_use_ptr(c); 2517 if (client == NULL) 2518 continue; 2519 if (client->type == NO_CLIENT) { 2520 snd_seq_client_unlock(client); 2521 continue; 2522 } 2523 2524 snd_iprintf(buffer, "Client %3d : \"%s\" [%s]\n", 2525 c, client->name, 2526 client->type == USER_CLIENT ? "User" : "Kernel"); 2527 snd_seq_info_dump_ports(buffer, client); 2528 if (snd_seq_write_pool_allocated(client)) { 2529 snd_iprintf(buffer, " Output pool :\n"); 2530 snd_seq_info_pool(buffer, client->pool, " "); 2531 } 2532 if (client->type == USER_CLIENT && client->data.user.fifo && 2533 client->data.user.fifo->pool) { 2534 snd_iprintf(buffer, " Input pool :\n"); 2535 snd_seq_info_pool(buffer, client->data.user.fifo->pool, " "); 2536 } 2537 snd_seq_client_unlock(client); 2538 } 2539 } 2540 #endif /* CONFIG_PROC_FS */ 2541 2542 /*---------------------------------------------------------------------------*/ 2543 2544 2545 /* 2546 * REGISTRATION PART 2547 */ 2548 2549 static const struct file_operations snd_seq_f_ops = 2550 { 2551 .owner = THIS_MODULE, 2552 .read = snd_seq_read, 2553 .write = snd_seq_write, 2554 .open = snd_seq_open, 2555 .release = snd_seq_release, 2556 .llseek = no_llseek, 2557 .poll = snd_seq_poll, 2558 .unlocked_ioctl = snd_seq_ioctl, 2559 .compat_ioctl = snd_seq_ioctl_compat, 2560 }; 2561 2562 /* 2563 * register sequencer device 2564 */ 2565 int __init snd_sequencer_device_init(void) 2566 { 2567 int err; 2568 2569 if (mutex_lock_interruptible(®ister_mutex)) 2570 return -ERESTARTSYS; 2571 2572 if ((err = snd_register_device(SNDRV_DEVICE_TYPE_SEQUENCER, NULL, 0, 2573 &snd_seq_f_ops, NULL, "seq")) < 0) { 2574 mutex_unlock(®ister_mutex); 2575 return err; 2576 } 2577 2578 mutex_unlock(®ister_mutex); 2579 2580 return 0; 2581 } 2582 2583 2584 2585 /* 2586 * unregister sequencer device 2587 */ 2588 void __exit snd_sequencer_device_done(void) 2589 { 2590 snd_unregister_device(SNDRV_DEVICE_TYPE_SEQUENCER, NULL, 0); 2591 } 2592