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, result = 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 /* save first error that occurs and continue */ 690 if (!result) 691 result = err; 692 continue; 693 } 694 num_ev++; 695 /* restore original event record */ 696 *event = event_saved; 697 } 698 if (atomic) 699 read_unlock(&grp->list_lock); 700 else 701 up_read(&grp->list_mutex); 702 *event = event_saved; /* restore */ 703 snd_seq_port_unlock(src_port); 704 return (result < 0) ? result : num_ev; 705 } 706 707 708 #ifdef SUPPORT_BROADCAST 709 /* 710 * broadcast to all ports: 711 */ 712 static int port_broadcast_event(struct snd_seq_client *client, 713 struct snd_seq_event *event, 714 int atomic, int hop) 715 { 716 int num_ev = 0, err, result = 0; 717 struct snd_seq_client *dest_client; 718 struct snd_seq_client_port *port; 719 720 dest_client = get_event_dest_client(event, SNDRV_SEQ_FILTER_BROADCAST); 721 if (dest_client == NULL) 722 return 0; /* no matching destination */ 723 724 read_lock(&dest_client->ports_lock); 725 list_for_each_entry(port, &dest_client->ports_list_head, list) { 726 event->dest.port = port->addr.port; 727 /* pass NULL as source client to avoid error bounce */ 728 err = snd_seq_deliver_single_event(NULL, event, 729 SNDRV_SEQ_FILTER_BROADCAST, 730 atomic, hop); 731 if (err < 0) { 732 /* save first error that occurs and continue */ 733 if (!result) 734 result = err; 735 continue; 736 } 737 num_ev++; 738 } 739 read_unlock(&dest_client->ports_lock); 740 snd_seq_client_unlock(dest_client); 741 event->dest.port = SNDRV_SEQ_ADDRESS_BROADCAST; /* restore */ 742 return (result < 0) ? result : num_ev; 743 } 744 745 /* 746 * send the event to all clients: 747 * if destination port is also ADDRESS_BROADCAST, deliver to all ports. 748 */ 749 static int broadcast_event(struct snd_seq_client *client, 750 struct snd_seq_event *event, int atomic, int hop) 751 { 752 int err, result = 0, num_ev = 0; 753 int dest; 754 struct snd_seq_addr addr; 755 756 addr = event->dest; /* save */ 757 758 for (dest = 0; dest < SNDRV_SEQ_MAX_CLIENTS; dest++) { 759 /* don't send to itself */ 760 if (dest == client->number) 761 continue; 762 event->dest.client = dest; 763 event->dest.port = addr.port; 764 if (addr.port == SNDRV_SEQ_ADDRESS_BROADCAST) 765 err = port_broadcast_event(client, event, atomic, hop); 766 else 767 /* pass NULL as source client to avoid error bounce */ 768 err = snd_seq_deliver_single_event(NULL, event, 769 SNDRV_SEQ_FILTER_BROADCAST, 770 atomic, hop); 771 if (err < 0) { 772 /* save first error that occurs and continue */ 773 if (!result) 774 result = err; 775 continue; 776 } 777 num_ev += err; 778 } 779 event->dest = addr; /* restore */ 780 return (result < 0) ? result : num_ev; 781 } 782 783 784 /* multicast - not supported yet */ 785 static int multicast_event(struct snd_seq_client *client, struct snd_seq_event *event, 786 int atomic, int hop) 787 { 788 pr_debug("ALSA: seq: multicast not supported yet.\n"); 789 return 0; /* ignored */ 790 } 791 #endif /* SUPPORT_BROADCAST */ 792 793 794 /* deliver an event to the destination port(s). 795 * if the event is to subscribers or broadcast, the event is dispatched 796 * to multiple targets. 797 * 798 * RETURN VALUE: n > 0 : the number of delivered events. 799 * n == 0 : the event was not passed to any client. 800 * n < 0 : error - event was not processed. 801 */ 802 static int snd_seq_deliver_event(struct snd_seq_client *client, struct snd_seq_event *event, 803 int atomic, int hop) 804 { 805 int result; 806 807 hop++; 808 if (hop >= SNDRV_SEQ_MAX_HOPS) { 809 pr_debug("ALSA: seq: too long delivery path (%d:%d->%d:%d)\n", 810 event->source.client, event->source.port, 811 event->dest.client, event->dest.port); 812 return -EMLINK; 813 } 814 815 if (event->queue == SNDRV_SEQ_ADDRESS_SUBSCRIBERS || 816 event->dest.client == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) 817 result = deliver_to_subscribers(client, event, atomic, hop); 818 #ifdef SUPPORT_BROADCAST 819 else if (event->queue == SNDRV_SEQ_ADDRESS_BROADCAST || 820 event->dest.client == SNDRV_SEQ_ADDRESS_BROADCAST) 821 result = broadcast_event(client, event, atomic, hop); 822 else if (event->dest.client >= SNDRV_SEQ_MAX_CLIENTS) 823 result = multicast_event(client, event, atomic, hop); 824 else if (event->dest.port == SNDRV_SEQ_ADDRESS_BROADCAST) 825 result = port_broadcast_event(client, event, atomic, hop); 826 #endif 827 else 828 result = snd_seq_deliver_single_event(client, event, 0, atomic, hop); 829 830 return result; 831 } 832 833 /* 834 * dispatch an event cell: 835 * This function is called only from queue check routines in timer 836 * interrupts or after enqueued. 837 * The event cell shall be released or re-queued in this function. 838 * 839 * RETURN VALUE: n > 0 : the number of delivered events. 840 * n == 0 : the event was not passed to any client. 841 * n < 0 : error - event was not processed. 842 */ 843 int snd_seq_dispatch_event(struct snd_seq_event_cell *cell, int atomic, int hop) 844 { 845 struct snd_seq_client *client; 846 int result; 847 848 if (snd_BUG_ON(!cell)) 849 return -EINVAL; 850 851 client = snd_seq_client_use_ptr(cell->event.source.client); 852 if (client == NULL) { 853 snd_seq_cell_free(cell); /* release this cell */ 854 return -EINVAL; 855 } 856 857 if (cell->event.type == SNDRV_SEQ_EVENT_NOTE) { 858 /* NOTE event: 859 * the event cell is re-used as a NOTE-OFF event and 860 * enqueued again. 861 */ 862 struct snd_seq_event tmpev, *ev; 863 864 /* reserve this event to enqueue note-off later */ 865 tmpev = cell->event; 866 tmpev.type = SNDRV_SEQ_EVENT_NOTEON; 867 result = snd_seq_deliver_event(client, &tmpev, atomic, hop); 868 869 /* 870 * This was originally a note event. We now re-use the 871 * cell for the note-off event. 872 */ 873 874 ev = &cell->event; 875 ev->type = SNDRV_SEQ_EVENT_NOTEOFF; 876 ev->flags |= SNDRV_SEQ_PRIORITY_HIGH; 877 878 /* add the duration time */ 879 switch (ev->flags & SNDRV_SEQ_TIME_STAMP_MASK) { 880 case SNDRV_SEQ_TIME_STAMP_TICK: 881 ev->time.tick += ev->data.note.duration; 882 break; 883 case SNDRV_SEQ_TIME_STAMP_REAL: 884 /* unit for duration is ms */ 885 ev->time.time.tv_nsec += 1000000 * (ev->data.note.duration % 1000); 886 ev->time.time.tv_sec += ev->data.note.duration / 1000 + 887 ev->time.time.tv_nsec / 1000000000; 888 ev->time.time.tv_nsec %= 1000000000; 889 break; 890 } 891 ev->data.note.velocity = ev->data.note.off_velocity; 892 893 /* Now queue this cell as the note off event */ 894 if (snd_seq_enqueue_event(cell, atomic, hop) < 0) 895 snd_seq_cell_free(cell); /* release this cell */ 896 897 } else { 898 /* Normal events: 899 * event cell is freed after processing the event 900 */ 901 902 result = snd_seq_deliver_event(client, &cell->event, atomic, hop); 903 snd_seq_cell_free(cell); 904 } 905 906 snd_seq_client_unlock(client); 907 return result; 908 } 909 910 911 /* Allocate a cell from client pool and enqueue it to queue: 912 * if pool is empty and blocking is TRUE, sleep until a new cell is 913 * available. 914 */ 915 static int snd_seq_client_enqueue_event(struct snd_seq_client *client, 916 struct snd_seq_event *event, 917 struct file *file, int blocking, 918 int atomic, int hop) 919 { 920 struct snd_seq_event_cell *cell; 921 int err; 922 923 /* special queue values - force direct passing */ 924 if (event->queue == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) { 925 event->dest.client = SNDRV_SEQ_ADDRESS_SUBSCRIBERS; 926 event->queue = SNDRV_SEQ_QUEUE_DIRECT; 927 } else 928 #ifdef SUPPORT_BROADCAST 929 if (event->queue == SNDRV_SEQ_ADDRESS_BROADCAST) { 930 event->dest.client = SNDRV_SEQ_ADDRESS_BROADCAST; 931 event->queue = SNDRV_SEQ_QUEUE_DIRECT; 932 } 933 #endif 934 if (event->dest.client == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) { 935 /* check presence of source port */ 936 struct snd_seq_client_port *src_port = snd_seq_port_use_ptr(client, event->source.port); 937 if (src_port == NULL) 938 return -EINVAL; 939 snd_seq_port_unlock(src_port); 940 } 941 942 /* direct event processing without enqueued */ 943 if (snd_seq_ev_is_direct(event)) { 944 if (event->type == SNDRV_SEQ_EVENT_NOTE) 945 return -EINVAL; /* this event must be enqueued! */ 946 return snd_seq_deliver_event(client, event, atomic, hop); 947 } 948 949 /* Not direct, normal queuing */ 950 if (snd_seq_queue_is_used(event->queue, client->number) <= 0) 951 return -EINVAL; /* invalid queue */ 952 if (! snd_seq_write_pool_allocated(client)) 953 return -ENXIO; /* queue is not allocated */ 954 955 /* allocate an event cell */ 956 err = snd_seq_event_dup(client->pool, event, &cell, !blocking || atomic, file); 957 if (err < 0) 958 return err; 959 960 /* we got a cell. enqueue it. */ 961 if ((err = snd_seq_enqueue_event(cell, atomic, hop)) < 0) { 962 snd_seq_cell_free(cell); 963 return err; 964 } 965 966 return 0; 967 } 968 969 970 /* 971 * check validity of event type and data length. 972 * return non-zero if invalid. 973 */ 974 static int check_event_type_and_length(struct snd_seq_event *ev) 975 { 976 switch (snd_seq_ev_length_type(ev)) { 977 case SNDRV_SEQ_EVENT_LENGTH_FIXED: 978 if (snd_seq_ev_is_variable_type(ev)) 979 return -EINVAL; 980 break; 981 case SNDRV_SEQ_EVENT_LENGTH_VARIABLE: 982 if (! snd_seq_ev_is_variable_type(ev) || 983 (ev->data.ext.len & ~SNDRV_SEQ_EXT_MASK) >= SNDRV_SEQ_MAX_EVENT_LEN) 984 return -EINVAL; 985 break; 986 case SNDRV_SEQ_EVENT_LENGTH_VARUSR: 987 if (! snd_seq_ev_is_direct(ev)) 988 return -EINVAL; 989 break; 990 } 991 return 0; 992 } 993 994 995 /* handle write() */ 996 /* possible error values: 997 * -ENXIO invalid client or file open mode 998 * -ENOMEM malloc failed 999 * -EFAULT seg. fault during copy from user space 1000 * -EINVAL invalid event 1001 * -EAGAIN no space in output pool 1002 * -EINTR interrupts while sleep 1003 * -EMLINK too many hops 1004 * others depends on return value from driver callback 1005 */ 1006 static ssize_t snd_seq_write(struct file *file, const char __user *buf, 1007 size_t count, loff_t *offset) 1008 { 1009 struct snd_seq_client *client = file->private_data; 1010 int written = 0, len; 1011 int err = -EINVAL; 1012 struct snd_seq_event event; 1013 1014 if (!(snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT)) 1015 return -ENXIO; 1016 1017 /* check client structures are in place */ 1018 if (snd_BUG_ON(!client)) 1019 return -ENXIO; 1020 1021 if (!client->accept_output || client->pool == NULL) 1022 return -ENXIO; 1023 1024 /* allocate the pool now if the pool is not allocated yet */ 1025 if (client->pool->size > 0 && !snd_seq_write_pool_allocated(client)) { 1026 if (snd_seq_pool_init(client->pool) < 0) 1027 return -ENOMEM; 1028 } 1029 1030 /* only process whole events */ 1031 while (count >= sizeof(struct snd_seq_event)) { 1032 /* Read in the event header from the user */ 1033 len = sizeof(event); 1034 if (copy_from_user(&event, buf, len)) { 1035 err = -EFAULT; 1036 break; 1037 } 1038 event.source.client = client->number; /* fill in client number */ 1039 /* Check for extension data length */ 1040 if (check_event_type_and_length(&event)) { 1041 err = -EINVAL; 1042 break; 1043 } 1044 1045 /* check for special events */ 1046 if (event.type == SNDRV_SEQ_EVENT_NONE) 1047 goto __skip_event; 1048 else if (snd_seq_ev_is_reserved(&event)) { 1049 err = -EINVAL; 1050 break; 1051 } 1052 1053 if (snd_seq_ev_is_variable(&event)) { 1054 int extlen = event.data.ext.len & ~SNDRV_SEQ_EXT_MASK; 1055 if ((size_t)(extlen + len) > count) { 1056 /* back out, will get an error this time or next */ 1057 err = -EINVAL; 1058 break; 1059 } 1060 /* set user space pointer */ 1061 event.data.ext.len = extlen | SNDRV_SEQ_EXT_USRPTR; 1062 event.data.ext.ptr = (char __force *)buf 1063 + sizeof(struct snd_seq_event); 1064 len += extlen; /* increment data length */ 1065 } else { 1066 #ifdef CONFIG_COMPAT 1067 if (client->convert32 && snd_seq_ev_is_varusr(&event)) { 1068 void *ptr = (void __force *)compat_ptr(event.data.raw32.d[1]); 1069 event.data.ext.ptr = ptr; 1070 } 1071 #endif 1072 } 1073 1074 /* ok, enqueue it */ 1075 err = snd_seq_client_enqueue_event(client, &event, file, 1076 !(file->f_flags & O_NONBLOCK), 1077 0, 0); 1078 if (err < 0) 1079 break; 1080 1081 __skip_event: 1082 /* Update pointers and counts */ 1083 count -= len; 1084 buf += len; 1085 written += len; 1086 } 1087 1088 return written ? written : err; 1089 } 1090 1091 1092 /* 1093 * handle polling 1094 */ 1095 static unsigned int snd_seq_poll(struct file *file, poll_table * wait) 1096 { 1097 struct snd_seq_client *client = file->private_data; 1098 unsigned int mask = 0; 1099 1100 /* check client structures are in place */ 1101 if (snd_BUG_ON(!client)) 1102 return -ENXIO; 1103 1104 if ((snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_INPUT) && 1105 client->data.user.fifo) { 1106 1107 /* check if data is available in the outqueue */ 1108 if (snd_seq_fifo_poll_wait(client->data.user.fifo, file, wait)) 1109 mask |= POLLIN | POLLRDNORM; 1110 } 1111 1112 if (snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT) { 1113 1114 /* check if data is available in the pool */ 1115 if (!snd_seq_write_pool_allocated(client) || 1116 snd_seq_pool_poll_wait(client->pool, file, wait)) 1117 mask |= POLLOUT | POLLWRNORM; 1118 } 1119 1120 return mask; 1121 } 1122 1123 1124 /*-----------------------------------------------------*/ 1125 1126 1127 /* SYSTEM_INFO ioctl() */ 1128 static int snd_seq_ioctl_system_info(struct snd_seq_client *client, void __user *arg) 1129 { 1130 struct snd_seq_system_info info; 1131 1132 memset(&info, 0, sizeof(info)); 1133 /* fill the info fields */ 1134 info.queues = SNDRV_SEQ_MAX_QUEUES; 1135 info.clients = SNDRV_SEQ_MAX_CLIENTS; 1136 info.ports = SNDRV_SEQ_MAX_PORTS; 1137 info.channels = 256; /* fixed limit */ 1138 info.cur_clients = client_usage.cur; 1139 info.cur_queues = snd_seq_queue_get_cur_queues(); 1140 1141 if (copy_to_user(arg, &info, sizeof(info))) 1142 return -EFAULT; 1143 return 0; 1144 } 1145 1146 1147 /* RUNNING_MODE ioctl() */ 1148 static int snd_seq_ioctl_running_mode(struct snd_seq_client *client, void __user *arg) 1149 { 1150 struct snd_seq_running_info info; 1151 struct snd_seq_client *cptr; 1152 int err = 0; 1153 1154 if (copy_from_user(&info, arg, sizeof(info))) 1155 return -EFAULT; 1156 1157 /* requested client number */ 1158 cptr = snd_seq_client_use_ptr(info.client); 1159 if (cptr == NULL) 1160 return -ENOENT; /* don't change !!! */ 1161 1162 #ifdef SNDRV_BIG_ENDIAN 1163 if (! info.big_endian) { 1164 err = -EINVAL; 1165 goto __err; 1166 } 1167 #else 1168 if (info.big_endian) { 1169 err = -EINVAL; 1170 goto __err; 1171 } 1172 1173 #endif 1174 if (info.cpu_mode > sizeof(long)) { 1175 err = -EINVAL; 1176 goto __err; 1177 } 1178 cptr->convert32 = (info.cpu_mode < sizeof(long)); 1179 __err: 1180 snd_seq_client_unlock(cptr); 1181 return err; 1182 } 1183 1184 /* CLIENT_INFO ioctl() */ 1185 static void get_client_info(struct snd_seq_client *cptr, 1186 struct snd_seq_client_info *info) 1187 { 1188 info->client = cptr->number; 1189 1190 /* fill the info fields */ 1191 info->type = cptr->type; 1192 strcpy(info->name, cptr->name); 1193 info->filter = cptr->filter; 1194 info->event_lost = cptr->event_lost; 1195 memcpy(info->event_filter, cptr->event_filter, 32); 1196 info->num_ports = cptr->num_ports; 1197 memset(info->reserved, 0, sizeof(info->reserved)); 1198 } 1199 1200 static int snd_seq_ioctl_get_client_info(struct snd_seq_client *client, 1201 void __user *arg) 1202 { 1203 struct snd_seq_client *cptr; 1204 struct snd_seq_client_info client_info; 1205 1206 if (copy_from_user(&client_info, arg, sizeof(client_info))) 1207 return -EFAULT; 1208 1209 /* requested client number */ 1210 cptr = snd_seq_client_use_ptr(client_info.client); 1211 if (cptr == NULL) 1212 return -ENOENT; /* don't change !!! */ 1213 1214 get_client_info(cptr, &client_info); 1215 snd_seq_client_unlock(cptr); 1216 1217 if (copy_to_user(arg, &client_info, sizeof(client_info))) 1218 return -EFAULT; 1219 return 0; 1220 } 1221 1222 1223 /* CLIENT_INFO ioctl() */ 1224 static int snd_seq_ioctl_set_client_info(struct snd_seq_client *client, 1225 void __user *arg) 1226 { 1227 struct snd_seq_client_info client_info; 1228 1229 if (copy_from_user(&client_info, arg, sizeof(client_info))) 1230 return -EFAULT; 1231 1232 /* it is not allowed to set the info fields for an another client */ 1233 if (client->number != client_info.client) 1234 return -EPERM; 1235 /* also client type must be set now */ 1236 if (client->type != client_info.type) 1237 return -EINVAL; 1238 1239 /* fill the info fields */ 1240 if (client_info.name[0]) 1241 strlcpy(client->name, client_info.name, sizeof(client->name)); 1242 1243 client->filter = client_info.filter; 1244 client->event_lost = client_info.event_lost; 1245 memcpy(client->event_filter, client_info.event_filter, 32); 1246 1247 return 0; 1248 } 1249 1250 1251 /* 1252 * CREATE PORT ioctl() 1253 */ 1254 static int snd_seq_ioctl_create_port(struct snd_seq_client *client, 1255 void __user *arg) 1256 { 1257 struct snd_seq_client_port *port; 1258 struct snd_seq_port_info info; 1259 struct snd_seq_port_callback *callback; 1260 1261 if (copy_from_user(&info, arg, sizeof(info))) 1262 return -EFAULT; 1263 1264 /* it is not allowed to create the port for an another client */ 1265 if (info.addr.client != client->number) 1266 return -EPERM; 1267 1268 port = snd_seq_create_port(client, (info.flags & SNDRV_SEQ_PORT_FLG_GIVEN_PORT) ? info.addr.port : -1); 1269 if (port == NULL) 1270 return -ENOMEM; 1271 1272 if (client->type == USER_CLIENT && info.kernel) { 1273 snd_seq_delete_port(client, port->addr.port); 1274 return -EINVAL; 1275 } 1276 if (client->type == KERNEL_CLIENT) { 1277 if ((callback = info.kernel) != NULL) { 1278 if (callback->owner) 1279 port->owner = callback->owner; 1280 port->private_data = callback->private_data; 1281 port->private_free = callback->private_free; 1282 port->event_input = callback->event_input; 1283 port->c_src.open = callback->subscribe; 1284 port->c_src.close = callback->unsubscribe; 1285 port->c_dest.open = callback->use; 1286 port->c_dest.close = callback->unuse; 1287 } 1288 } 1289 1290 info.addr = port->addr; 1291 1292 snd_seq_set_port_info(port, &info); 1293 snd_seq_system_client_ev_port_start(port->addr.client, port->addr.port); 1294 1295 if (copy_to_user(arg, &info, sizeof(info))) 1296 return -EFAULT; 1297 1298 return 0; 1299 } 1300 1301 /* 1302 * DELETE PORT ioctl() 1303 */ 1304 static int snd_seq_ioctl_delete_port(struct snd_seq_client *client, 1305 void __user *arg) 1306 { 1307 struct snd_seq_port_info info; 1308 int err; 1309 1310 /* set passed parameters */ 1311 if (copy_from_user(&info, arg, sizeof(info))) 1312 return -EFAULT; 1313 1314 /* it is not allowed to remove the port for an another client */ 1315 if (info.addr.client != client->number) 1316 return -EPERM; 1317 1318 err = snd_seq_delete_port(client, info.addr.port); 1319 if (err >= 0) 1320 snd_seq_system_client_ev_port_exit(client->number, info.addr.port); 1321 return err; 1322 } 1323 1324 1325 /* 1326 * GET_PORT_INFO ioctl() (on any client) 1327 */ 1328 static int snd_seq_ioctl_get_port_info(struct snd_seq_client *client, 1329 void __user *arg) 1330 { 1331 struct snd_seq_client *cptr; 1332 struct snd_seq_client_port *port; 1333 struct snd_seq_port_info info; 1334 1335 if (copy_from_user(&info, arg, sizeof(info))) 1336 return -EFAULT; 1337 cptr = snd_seq_client_use_ptr(info.addr.client); 1338 if (cptr == NULL) 1339 return -ENXIO; 1340 1341 port = snd_seq_port_use_ptr(cptr, info.addr.port); 1342 if (port == NULL) { 1343 snd_seq_client_unlock(cptr); 1344 return -ENOENT; /* don't change */ 1345 } 1346 1347 /* get port info */ 1348 snd_seq_get_port_info(port, &info); 1349 snd_seq_port_unlock(port); 1350 snd_seq_client_unlock(cptr); 1351 1352 if (copy_to_user(arg, &info, sizeof(info))) 1353 return -EFAULT; 1354 return 0; 1355 } 1356 1357 1358 /* 1359 * SET_PORT_INFO ioctl() (only ports on this/own client) 1360 */ 1361 static int snd_seq_ioctl_set_port_info(struct snd_seq_client *client, 1362 void __user *arg) 1363 { 1364 struct snd_seq_client_port *port; 1365 struct snd_seq_port_info info; 1366 1367 if (copy_from_user(&info, arg, sizeof(info))) 1368 return -EFAULT; 1369 1370 if (info.addr.client != client->number) /* only set our own ports ! */ 1371 return -EPERM; 1372 port = snd_seq_port_use_ptr(client, info.addr.port); 1373 if (port) { 1374 snd_seq_set_port_info(port, &info); 1375 snd_seq_port_unlock(port); 1376 } 1377 return 0; 1378 } 1379 1380 1381 /* 1382 * port subscription (connection) 1383 */ 1384 #define PERM_RD (SNDRV_SEQ_PORT_CAP_READ|SNDRV_SEQ_PORT_CAP_SUBS_READ) 1385 #define PERM_WR (SNDRV_SEQ_PORT_CAP_WRITE|SNDRV_SEQ_PORT_CAP_SUBS_WRITE) 1386 1387 static int check_subscription_permission(struct snd_seq_client *client, 1388 struct snd_seq_client_port *sport, 1389 struct snd_seq_client_port *dport, 1390 struct snd_seq_port_subscribe *subs) 1391 { 1392 if (client->number != subs->sender.client && 1393 client->number != subs->dest.client) { 1394 /* connection by third client - check export permission */ 1395 if (check_port_perm(sport, SNDRV_SEQ_PORT_CAP_NO_EXPORT)) 1396 return -EPERM; 1397 if (check_port_perm(dport, SNDRV_SEQ_PORT_CAP_NO_EXPORT)) 1398 return -EPERM; 1399 } 1400 1401 /* check read permission */ 1402 /* if sender or receiver is the subscribing client itself, 1403 * no permission check is necessary 1404 */ 1405 if (client->number != subs->sender.client) { 1406 if (! check_port_perm(sport, PERM_RD)) 1407 return -EPERM; 1408 } 1409 /* check write permission */ 1410 if (client->number != subs->dest.client) { 1411 if (! check_port_perm(dport, PERM_WR)) 1412 return -EPERM; 1413 } 1414 return 0; 1415 } 1416 1417 /* 1418 * send an subscription notify event to user client: 1419 * client must be user client. 1420 */ 1421 int snd_seq_client_notify_subscription(int client, int port, 1422 struct snd_seq_port_subscribe *info, 1423 int evtype) 1424 { 1425 struct snd_seq_event event; 1426 1427 memset(&event, 0, sizeof(event)); 1428 event.type = evtype; 1429 event.data.connect.dest = info->dest; 1430 event.data.connect.sender = info->sender; 1431 1432 return snd_seq_system_notify(client, port, &event); /* non-atomic */ 1433 } 1434 1435 1436 /* 1437 * add to port's subscription list IOCTL interface 1438 */ 1439 static int snd_seq_ioctl_subscribe_port(struct snd_seq_client *client, 1440 void __user *arg) 1441 { 1442 int result = -EINVAL; 1443 struct snd_seq_client *receiver = NULL, *sender = NULL; 1444 struct snd_seq_client_port *sport = NULL, *dport = NULL; 1445 struct snd_seq_port_subscribe subs; 1446 1447 if (copy_from_user(&subs, arg, sizeof(subs))) 1448 return -EFAULT; 1449 1450 if ((receiver = snd_seq_client_use_ptr(subs.dest.client)) == NULL) 1451 goto __end; 1452 if ((sender = snd_seq_client_use_ptr(subs.sender.client)) == NULL) 1453 goto __end; 1454 if ((sport = snd_seq_port_use_ptr(sender, subs.sender.port)) == NULL) 1455 goto __end; 1456 if ((dport = snd_seq_port_use_ptr(receiver, subs.dest.port)) == NULL) 1457 goto __end; 1458 1459 result = check_subscription_permission(client, sport, dport, &subs); 1460 if (result < 0) 1461 goto __end; 1462 1463 /* connect them */ 1464 result = snd_seq_port_connect(client, sender, sport, receiver, dport, &subs); 1465 if (! result) /* broadcast announce */ 1466 snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0, 1467 &subs, SNDRV_SEQ_EVENT_PORT_SUBSCRIBED); 1468 __end: 1469 if (sport) 1470 snd_seq_port_unlock(sport); 1471 if (dport) 1472 snd_seq_port_unlock(dport); 1473 if (sender) 1474 snd_seq_client_unlock(sender); 1475 if (receiver) 1476 snd_seq_client_unlock(receiver); 1477 return result; 1478 } 1479 1480 1481 /* 1482 * remove from port's subscription list 1483 */ 1484 static int snd_seq_ioctl_unsubscribe_port(struct snd_seq_client *client, 1485 void __user *arg) 1486 { 1487 int result = -ENXIO; 1488 struct snd_seq_client *receiver = NULL, *sender = NULL; 1489 struct snd_seq_client_port *sport = NULL, *dport = NULL; 1490 struct snd_seq_port_subscribe subs; 1491 1492 if (copy_from_user(&subs, arg, sizeof(subs))) 1493 return -EFAULT; 1494 1495 if ((receiver = snd_seq_client_use_ptr(subs.dest.client)) == NULL) 1496 goto __end; 1497 if ((sender = snd_seq_client_use_ptr(subs.sender.client)) == NULL) 1498 goto __end; 1499 if ((sport = snd_seq_port_use_ptr(sender, subs.sender.port)) == NULL) 1500 goto __end; 1501 if ((dport = snd_seq_port_use_ptr(receiver, subs.dest.port)) == NULL) 1502 goto __end; 1503 1504 result = check_subscription_permission(client, sport, dport, &subs); 1505 if (result < 0) 1506 goto __end; 1507 1508 result = snd_seq_port_disconnect(client, sender, sport, receiver, dport, &subs); 1509 if (! result) /* broadcast announce */ 1510 snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0, 1511 &subs, SNDRV_SEQ_EVENT_PORT_UNSUBSCRIBED); 1512 __end: 1513 if (sport) 1514 snd_seq_port_unlock(sport); 1515 if (dport) 1516 snd_seq_port_unlock(dport); 1517 if (sender) 1518 snd_seq_client_unlock(sender); 1519 if (receiver) 1520 snd_seq_client_unlock(receiver); 1521 return result; 1522 } 1523 1524 1525 /* CREATE_QUEUE ioctl() */ 1526 static int snd_seq_ioctl_create_queue(struct snd_seq_client *client, 1527 void __user *arg) 1528 { 1529 struct snd_seq_queue_info info; 1530 int result; 1531 struct snd_seq_queue *q; 1532 1533 if (copy_from_user(&info, arg, sizeof(info))) 1534 return -EFAULT; 1535 1536 result = snd_seq_queue_alloc(client->number, info.locked, info.flags); 1537 if (result < 0) 1538 return result; 1539 1540 q = queueptr(result); 1541 if (q == NULL) 1542 return -EINVAL; 1543 1544 info.queue = q->queue; 1545 info.locked = q->locked; 1546 info.owner = q->owner; 1547 1548 /* set queue name */ 1549 if (! info.name[0]) 1550 snprintf(info.name, sizeof(info.name), "Queue-%d", q->queue); 1551 strlcpy(q->name, info.name, sizeof(q->name)); 1552 queuefree(q); 1553 1554 if (copy_to_user(arg, &info, sizeof(info))) 1555 return -EFAULT; 1556 1557 return 0; 1558 } 1559 1560 /* DELETE_QUEUE ioctl() */ 1561 static int snd_seq_ioctl_delete_queue(struct snd_seq_client *client, 1562 void __user *arg) 1563 { 1564 struct snd_seq_queue_info info; 1565 1566 if (copy_from_user(&info, arg, sizeof(info))) 1567 return -EFAULT; 1568 1569 return snd_seq_queue_delete(client->number, info.queue); 1570 } 1571 1572 /* GET_QUEUE_INFO ioctl() */ 1573 static int snd_seq_ioctl_get_queue_info(struct snd_seq_client *client, 1574 void __user *arg) 1575 { 1576 struct snd_seq_queue_info info; 1577 struct snd_seq_queue *q; 1578 1579 if (copy_from_user(&info, arg, sizeof(info))) 1580 return -EFAULT; 1581 1582 q = queueptr(info.queue); 1583 if (q == NULL) 1584 return -EINVAL; 1585 1586 memset(&info, 0, sizeof(info)); 1587 info.queue = q->queue; 1588 info.owner = q->owner; 1589 info.locked = q->locked; 1590 strlcpy(info.name, q->name, sizeof(info.name)); 1591 queuefree(q); 1592 1593 if (copy_to_user(arg, &info, sizeof(info))) 1594 return -EFAULT; 1595 1596 return 0; 1597 } 1598 1599 /* SET_QUEUE_INFO ioctl() */ 1600 static int snd_seq_ioctl_set_queue_info(struct snd_seq_client *client, 1601 void __user *arg) 1602 { 1603 struct snd_seq_queue_info info; 1604 struct snd_seq_queue *q; 1605 1606 if (copy_from_user(&info, arg, sizeof(info))) 1607 return -EFAULT; 1608 1609 if (info.owner != client->number) 1610 return -EINVAL; 1611 1612 /* change owner/locked permission */ 1613 if (snd_seq_queue_check_access(info.queue, client->number)) { 1614 if (snd_seq_queue_set_owner(info.queue, client->number, info.locked) < 0) 1615 return -EPERM; 1616 if (info.locked) 1617 snd_seq_queue_use(info.queue, client->number, 1); 1618 } else { 1619 return -EPERM; 1620 } 1621 1622 q = queueptr(info.queue); 1623 if (! q) 1624 return -EINVAL; 1625 if (q->owner != client->number) { 1626 queuefree(q); 1627 return -EPERM; 1628 } 1629 strlcpy(q->name, info.name, sizeof(q->name)); 1630 queuefree(q); 1631 1632 return 0; 1633 } 1634 1635 /* GET_NAMED_QUEUE ioctl() */ 1636 static int snd_seq_ioctl_get_named_queue(struct snd_seq_client *client, void __user *arg) 1637 { 1638 struct snd_seq_queue_info info; 1639 struct snd_seq_queue *q; 1640 1641 if (copy_from_user(&info, arg, sizeof(info))) 1642 return -EFAULT; 1643 1644 q = snd_seq_queue_find_name(info.name); 1645 if (q == NULL) 1646 return -EINVAL; 1647 info.queue = q->queue; 1648 info.owner = q->owner; 1649 info.locked = q->locked; 1650 queuefree(q); 1651 1652 if (copy_to_user(arg, &info, sizeof(info))) 1653 return -EFAULT; 1654 1655 return 0; 1656 } 1657 1658 /* GET_QUEUE_STATUS ioctl() */ 1659 static int snd_seq_ioctl_get_queue_status(struct snd_seq_client *client, 1660 void __user *arg) 1661 { 1662 struct snd_seq_queue_status status; 1663 struct snd_seq_queue *queue; 1664 struct snd_seq_timer *tmr; 1665 1666 if (copy_from_user(&status, arg, sizeof(status))) 1667 return -EFAULT; 1668 1669 queue = queueptr(status.queue); 1670 if (queue == NULL) 1671 return -EINVAL; 1672 memset(&status, 0, sizeof(status)); 1673 status.queue = queue->queue; 1674 1675 tmr = queue->timer; 1676 status.events = queue->tickq->cells + queue->timeq->cells; 1677 1678 status.time = snd_seq_timer_get_cur_time(tmr); 1679 status.tick = snd_seq_timer_get_cur_tick(tmr); 1680 1681 status.running = tmr->running; 1682 1683 status.flags = queue->flags; 1684 queuefree(queue); 1685 1686 if (copy_to_user(arg, &status, sizeof(status))) 1687 return -EFAULT; 1688 return 0; 1689 } 1690 1691 1692 /* GET_QUEUE_TEMPO ioctl() */ 1693 static int snd_seq_ioctl_get_queue_tempo(struct snd_seq_client *client, 1694 void __user *arg) 1695 { 1696 struct snd_seq_queue_tempo tempo; 1697 struct snd_seq_queue *queue; 1698 struct snd_seq_timer *tmr; 1699 1700 if (copy_from_user(&tempo, arg, sizeof(tempo))) 1701 return -EFAULT; 1702 1703 queue = queueptr(tempo.queue); 1704 if (queue == NULL) 1705 return -EINVAL; 1706 memset(&tempo, 0, sizeof(tempo)); 1707 tempo.queue = queue->queue; 1708 1709 tmr = queue->timer; 1710 1711 tempo.tempo = tmr->tempo; 1712 tempo.ppq = tmr->ppq; 1713 tempo.skew_value = tmr->skew; 1714 tempo.skew_base = tmr->skew_base; 1715 queuefree(queue); 1716 1717 if (copy_to_user(arg, &tempo, sizeof(tempo))) 1718 return -EFAULT; 1719 return 0; 1720 } 1721 1722 1723 /* SET_QUEUE_TEMPO ioctl() */ 1724 int snd_seq_set_queue_tempo(int client, struct snd_seq_queue_tempo *tempo) 1725 { 1726 if (!snd_seq_queue_check_access(tempo->queue, client)) 1727 return -EPERM; 1728 return snd_seq_queue_timer_set_tempo(tempo->queue, client, tempo); 1729 } 1730 1731 EXPORT_SYMBOL(snd_seq_set_queue_tempo); 1732 1733 static int snd_seq_ioctl_set_queue_tempo(struct snd_seq_client *client, 1734 void __user *arg) 1735 { 1736 int result; 1737 struct snd_seq_queue_tempo tempo; 1738 1739 if (copy_from_user(&tempo, arg, sizeof(tempo))) 1740 return -EFAULT; 1741 1742 result = snd_seq_set_queue_tempo(client->number, &tempo); 1743 return result < 0 ? result : 0; 1744 } 1745 1746 1747 /* GET_QUEUE_TIMER ioctl() */ 1748 static int snd_seq_ioctl_get_queue_timer(struct snd_seq_client *client, 1749 void __user *arg) 1750 { 1751 struct snd_seq_queue_timer timer; 1752 struct snd_seq_queue *queue; 1753 struct snd_seq_timer *tmr; 1754 1755 if (copy_from_user(&timer, arg, sizeof(timer))) 1756 return -EFAULT; 1757 1758 queue = queueptr(timer.queue); 1759 if (queue == NULL) 1760 return -EINVAL; 1761 1762 if (mutex_lock_interruptible(&queue->timer_mutex)) { 1763 queuefree(queue); 1764 return -ERESTARTSYS; 1765 } 1766 tmr = queue->timer; 1767 memset(&timer, 0, sizeof(timer)); 1768 timer.queue = queue->queue; 1769 1770 timer.type = tmr->type; 1771 if (tmr->type == SNDRV_SEQ_TIMER_ALSA) { 1772 timer.u.alsa.id = tmr->alsa_id; 1773 timer.u.alsa.resolution = tmr->preferred_resolution; 1774 } 1775 mutex_unlock(&queue->timer_mutex); 1776 queuefree(queue); 1777 1778 if (copy_to_user(arg, &timer, sizeof(timer))) 1779 return -EFAULT; 1780 return 0; 1781 } 1782 1783 1784 /* SET_QUEUE_TIMER ioctl() */ 1785 static int snd_seq_ioctl_set_queue_timer(struct snd_seq_client *client, 1786 void __user *arg) 1787 { 1788 int result = 0; 1789 struct snd_seq_queue_timer timer; 1790 1791 if (copy_from_user(&timer, arg, sizeof(timer))) 1792 return -EFAULT; 1793 1794 if (timer.type != SNDRV_SEQ_TIMER_ALSA) 1795 return -EINVAL; 1796 1797 if (snd_seq_queue_check_access(timer.queue, client->number)) { 1798 struct snd_seq_queue *q; 1799 struct snd_seq_timer *tmr; 1800 1801 q = queueptr(timer.queue); 1802 if (q == NULL) 1803 return -ENXIO; 1804 if (mutex_lock_interruptible(&q->timer_mutex)) { 1805 queuefree(q); 1806 return -ERESTARTSYS; 1807 } 1808 tmr = q->timer; 1809 snd_seq_queue_timer_close(timer.queue); 1810 tmr->type = timer.type; 1811 if (tmr->type == SNDRV_SEQ_TIMER_ALSA) { 1812 tmr->alsa_id = timer.u.alsa.id; 1813 tmr->preferred_resolution = timer.u.alsa.resolution; 1814 } 1815 result = snd_seq_queue_timer_open(timer.queue); 1816 mutex_unlock(&q->timer_mutex); 1817 queuefree(q); 1818 } else { 1819 return -EPERM; 1820 } 1821 1822 return result; 1823 } 1824 1825 1826 /* GET_QUEUE_CLIENT ioctl() */ 1827 static int snd_seq_ioctl_get_queue_client(struct snd_seq_client *client, 1828 void __user *arg) 1829 { 1830 struct snd_seq_queue_client info; 1831 int used; 1832 1833 if (copy_from_user(&info, arg, sizeof(info))) 1834 return -EFAULT; 1835 1836 used = snd_seq_queue_is_used(info.queue, client->number); 1837 if (used < 0) 1838 return -EINVAL; 1839 info.used = used; 1840 info.client = client->number; 1841 1842 if (copy_to_user(arg, &info, sizeof(info))) 1843 return -EFAULT; 1844 return 0; 1845 } 1846 1847 1848 /* SET_QUEUE_CLIENT ioctl() */ 1849 static int snd_seq_ioctl_set_queue_client(struct snd_seq_client *client, 1850 void __user *arg) 1851 { 1852 int err; 1853 struct snd_seq_queue_client info; 1854 1855 if (copy_from_user(&info, arg, sizeof(info))) 1856 return -EFAULT; 1857 1858 if (info.used >= 0) { 1859 err = snd_seq_queue_use(info.queue, client->number, info.used); 1860 if (err < 0) 1861 return err; 1862 } 1863 1864 return snd_seq_ioctl_get_queue_client(client, arg); 1865 } 1866 1867 1868 /* GET_CLIENT_POOL ioctl() */ 1869 static int snd_seq_ioctl_get_client_pool(struct snd_seq_client *client, 1870 void __user *arg) 1871 { 1872 struct snd_seq_client_pool info; 1873 struct snd_seq_client *cptr; 1874 1875 if (copy_from_user(&info, arg, sizeof(info))) 1876 return -EFAULT; 1877 1878 cptr = snd_seq_client_use_ptr(info.client); 1879 if (cptr == NULL) 1880 return -ENOENT; 1881 memset(&info, 0, sizeof(info)); 1882 info.client = cptr->number; 1883 info.output_pool = cptr->pool->size; 1884 info.output_room = cptr->pool->room; 1885 info.output_free = info.output_pool; 1886 info.output_free = snd_seq_unused_cells(cptr->pool); 1887 if (cptr->type == USER_CLIENT) { 1888 info.input_pool = cptr->data.user.fifo_pool_size; 1889 info.input_free = info.input_pool; 1890 if (cptr->data.user.fifo) 1891 info.input_free = snd_seq_unused_cells(cptr->data.user.fifo->pool); 1892 } else { 1893 info.input_pool = 0; 1894 info.input_free = 0; 1895 } 1896 snd_seq_client_unlock(cptr); 1897 1898 if (copy_to_user(arg, &info, sizeof(info))) 1899 return -EFAULT; 1900 return 0; 1901 } 1902 1903 /* SET_CLIENT_POOL ioctl() */ 1904 static int snd_seq_ioctl_set_client_pool(struct snd_seq_client *client, 1905 void __user *arg) 1906 { 1907 struct snd_seq_client_pool info; 1908 int rc; 1909 1910 if (copy_from_user(&info, arg, sizeof(info))) 1911 return -EFAULT; 1912 1913 if (client->number != info.client) 1914 return -EINVAL; /* can't change other clients */ 1915 1916 if (info.output_pool >= 1 && info.output_pool <= SNDRV_SEQ_MAX_EVENTS && 1917 (! snd_seq_write_pool_allocated(client) || 1918 info.output_pool != client->pool->size)) { 1919 if (snd_seq_write_pool_allocated(client)) { 1920 /* remove all existing cells */ 1921 snd_seq_queue_client_leave_cells(client->number); 1922 snd_seq_pool_done(client->pool); 1923 } 1924 client->pool->size = info.output_pool; 1925 rc = snd_seq_pool_init(client->pool); 1926 if (rc < 0) 1927 return rc; 1928 } 1929 if (client->type == USER_CLIENT && client->data.user.fifo != NULL && 1930 info.input_pool >= 1 && 1931 info.input_pool <= SNDRV_SEQ_MAX_CLIENT_EVENTS && 1932 info.input_pool != client->data.user.fifo_pool_size) { 1933 /* change pool size */ 1934 rc = snd_seq_fifo_resize(client->data.user.fifo, info.input_pool); 1935 if (rc < 0) 1936 return rc; 1937 client->data.user.fifo_pool_size = info.input_pool; 1938 } 1939 if (info.output_room >= 1 && 1940 info.output_room <= client->pool->size) { 1941 client->pool->room = info.output_room; 1942 } 1943 1944 return snd_seq_ioctl_get_client_pool(client, arg); 1945 } 1946 1947 1948 /* REMOVE_EVENTS ioctl() */ 1949 static int snd_seq_ioctl_remove_events(struct snd_seq_client *client, 1950 void __user *arg) 1951 { 1952 struct snd_seq_remove_events info; 1953 1954 if (copy_from_user(&info, arg, sizeof(info))) 1955 return -EFAULT; 1956 1957 /* 1958 * Input mostly not implemented XXX. 1959 */ 1960 if (info.remove_mode & SNDRV_SEQ_REMOVE_INPUT) { 1961 /* 1962 * No restrictions so for a user client we can clear 1963 * the whole fifo 1964 */ 1965 if (client->type == USER_CLIENT) 1966 snd_seq_fifo_clear(client->data.user.fifo); 1967 } 1968 1969 if (info.remove_mode & SNDRV_SEQ_REMOVE_OUTPUT) 1970 snd_seq_queue_remove_cells(client->number, &info); 1971 1972 return 0; 1973 } 1974 1975 1976 /* 1977 * get subscription info 1978 */ 1979 static int snd_seq_ioctl_get_subscription(struct snd_seq_client *client, 1980 void __user *arg) 1981 { 1982 int result; 1983 struct snd_seq_client *sender = NULL; 1984 struct snd_seq_client_port *sport = NULL; 1985 struct snd_seq_port_subscribe subs; 1986 struct snd_seq_subscribers *p; 1987 1988 if (copy_from_user(&subs, arg, sizeof(subs))) 1989 return -EFAULT; 1990 1991 result = -EINVAL; 1992 if ((sender = snd_seq_client_use_ptr(subs.sender.client)) == NULL) 1993 goto __end; 1994 if ((sport = snd_seq_port_use_ptr(sender, subs.sender.port)) == NULL) 1995 goto __end; 1996 p = snd_seq_port_get_subscription(&sport->c_src, &subs.dest); 1997 if (p) { 1998 result = 0; 1999 subs = p->info; 2000 } else 2001 result = -ENOENT; 2002 2003 __end: 2004 if (sport) 2005 snd_seq_port_unlock(sport); 2006 if (sender) 2007 snd_seq_client_unlock(sender); 2008 if (result >= 0) { 2009 if (copy_to_user(arg, &subs, sizeof(subs))) 2010 return -EFAULT; 2011 } 2012 return result; 2013 } 2014 2015 2016 /* 2017 * get subscription info - check only its presence 2018 */ 2019 static int snd_seq_ioctl_query_subs(struct snd_seq_client *client, 2020 void __user *arg) 2021 { 2022 int result = -ENXIO; 2023 struct snd_seq_client *cptr = NULL; 2024 struct snd_seq_client_port *port = NULL; 2025 struct snd_seq_query_subs subs; 2026 struct snd_seq_port_subs_info *group; 2027 struct list_head *p; 2028 int i; 2029 2030 if (copy_from_user(&subs, arg, sizeof(subs))) 2031 return -EFAULT; 2032 2033 if ((cptr = snd_seq_client_use_ptr(subs.root.client)) == NULL) 2034 goto __end; 2035 if ((port = snd_seq_port_use_ptr(cptr, subs.root.port)) == NULL) 2036 goto __end; 2037 2038 switch (subs.type) { 2039 case SNDRV_SEQ_QUERY_SUBS_READ: 2040 group = &port->c_src; 2041 break; 2042 case SNDRV_SEQ_QUERY_SUBS_WRITE: 2043 group = &port->c_dest; 2044 break; 2045 default: 2046 goto __end; 2047 } 2048 2049 down_read(&group->list_mutex); 2050 /* search for the subscriber */ 2051 subs.num_subs = group->count; 2052 i = 0; 2053 result = -ENOENT; 2054 list_for_each(p, &group->list_head) { 2055 if (i++ == subs.index) { 2056 /* found! */ 2057 struct snd_seq_subscribers *s; 2058 if (subs.type == SNDRV_SEQ_QUERY_SUBS_READ) { 2059 s = list_entry(p, struct snd_seq_subscribers, src_list); 2060 subs.addr = s->info.dest; 2061 } else { 2062 s = list_entry(p, struct snd_seq_subscribers, dest_list); 2063 subs.addr = s->info.sender; 2064 } 2065 subs.flags = s->info.flags; 2066 subs.queue = s->info.queue; 2067 result = 0; 2068 break; 2069 } 2070 } 2071 up_read(&group->list_mutex); 2072 2073 __end: 2074 if (port) 2075 snd_seq_port_unlock(port); 2076 if (cptr) 2077 snd_seq_client_unlock(cptr); 2078 if (result >= 0) { 2079 if (copy_to_user(arg, &subs, sizeof(subs))) 2080 return -EFAULT; 2081 } 2082 return result; 2083 } 2084 2085 2086 /* 2087 * query next client 2088 */ 2089 static int snd_seq_ioctl_query_next_client(struct snd_seq_client *client, 2090 void __user *arg) 2091 { 2092 struct snd_seq_client *cptr = NULL; 2093 struct snd_seq_client_info info; 2094 2095 if (copy_from_user(&info, arg, sizeof(info))) 2096 return -EFAULT; 2097 2098 /* search for next client */ 2099 info.client++; 2100 if (info.client < 0) 2101 info.client = 0; 2102 for (; info.client < SNDRV_SEQ_MAX_CLIENTS; info.client++) { 2103 cptr = snd_seq_client_use_ptr(info.client); 2104 if (cptr) 2105 break; /* found */ 2106 } 2107 if (cptr == NULL) 2108 return -ENOENT; 2109 2110 get_client_info(cptr, &info); 2111 snd_seq_client_unlock(cptr); 2112 2113 if (copy_to_user(arg, &info, sizeof(info))) 2114 return -EFAULT; 2115 return 0; 2116 } 2117 2118 /* 2119 * query next port 2120 */ 2121 static int snd_seq_ioctl_query_next_port(struct snd_seq_client *client, 2122 void __user *arg) 2123 { 2124 struct snd_seq_client *cptr; 2125 struct snd_seq_client_port *port = NULL; 2126 struct snd_seq_port_info info; 2127 2128 if (copy_from_user(&info, arg, sizeof(info))) 2129 return -EFAULT; 2130 cptr = snd_seq_client_use_ptr(info.addr.client); 2131 if (cptr == NULL) 2132 return -ENXIO; 2133 2134 /* search for next port */ 2135 info.addr.port++; 2136 port = snd_seq_port_query_nearest(cptr, &info); 2137 if (port == NULL) { 2138 snd_seq_client_unlock(cptr); 2139 return -ENOENT; 2140 } 2141 2142 /* get port info */ 2143 info.addr = port->addr; 2144 snd_seq_get_port_info(port, &info); 2145 snd_seq_port_unlock(port); 2146 snd_seq_client_unlock(cptr); 2147 2148 if (copy_to_user(arg, &info, sizeof(info))) 2149 return -EFAULT; 2150 return 0; 2151 } 2152 2153 /* -------------------------------------------------------- */ 2154 2155 static struct seq_ioctl_table { 2156 unsigned int cmd; 2157 int (*func)(struct snd_seq_client *client, void __user * arg); 2158 } ioctl_tables[] = { 2159 { SNDRV_SEQ_IOCTL_SYSTEM_INFO, snd_seq_ioctl_system_info }, 2160 { SNDRV_SEQ_IOCTL_RUNNING_MODE, snd_seq_ioctl_running_mode }, 2161 { SNDRV_SEQ_IOCTL_GET_CLIENT_INFO, snd_seq_ioctl_get_client_info }, 2162 { SNDRV_SEQ_IOCTL_SET_CLIENT_INFO, snd_seq_ioctl_set_client_info }, 2163 { SNDRV_SEQ_IOCTL_CREATE_PORT, snd_seq_ioctl_create_port }, 2164 { SNDRV_SEQ_IOCTL_DELETE_PORT, snd_seq_ioctl_delete_port }, 2165 { SNDRV_SEQ_IOCTL_GET_PORT_INFO, snd_seq_ioctl_get_port_info }, 2166 { SNDRV_SEQ_IOCTL_SET_PORT_INFO, snd_seq_ioctl_set_port_info }, 2167 { SNDRV_SEQ_IOCTL_SUBSCRIBE_PORT, snd_seq_ioctl_subscribe_port }, 2168 { SNDRV_SEQ_IOCTL_UNSUBSCRIBE_PORT, snd_seq_ioctl_unsubscribe_port }, 2169 { SNDRV_SEQ_IOCTL_CREATE_QUEUE, snd_seq_ioctl_create_queue }, 2170 { SNDRV_SEQ_IOCTL_DELETE_QUEUE, snd_seq_ioctl_delete_queue }, 2171 { SNDRV_SEQ_IOCTL_GET_QUEUE_INFO, snd_seq_ioctl_get_queue_info }, 2172 { SNDRV_SEQ_IOCTL_SET_QUEUE_INFO, snd_seq_ioctl_set_queue_info }, 2173 { SNDRV_SEQ_IOCTL_GET_NAMED_QUEUE, snd_seq_ioctl_get_named_queue }, 2174 { SNDRV_SEQ_IOCTL_GET_QUEUE_STATUS, snd_seq_ioctl_get_queue_status }, 2175 { SNDRV_SEQ_IOCTL_GET_QUEUE_TEMPO, snd_seq_ioctl_get_queue_tempo }, 2176 { SNDRV_SEQ_IOCTL_SET_QUEUE_TEMPO, snd_seq_ioctl_set_queue_tempo }, 2177 { SNDRV_SEQ_IOCTL_GET_QUEUE_TIMER, snd_seq_ioctl_get_queue_timer }, 2178 { SNDRV_SEQ_IOCTL_SET_QUEUE_TIMER, snd_seq_ioctl_set_queue_timer }, 2179 { SNDRV_SEQ_IOCTL_GET_QUEUE_CLIENT, snd_seq_ioctl_get_queue_client }, 2180 { SNDRV_SEQ_IOCTL_SET_QUEUE_CLIENT, snd_seq_ioctl_set_queue_client }, 2181 { SNDRV_SEQ_IOCTL_GET_CLIENT_POOL, snd_seq_ioctl_get_client_pool }, 2182 { SNDRV_SEQ_IOCTL_SET_CLIENT_POOL, snd_seq_ioctl_set_client_pool }, 2183 { SNDRV_SEQ_IOCTL_GET_SUBSCRIPTION, snd_seq_ioctl_get_subscription }, 2184 { SNDRV_SEQ_IOCTL_QUERY_NEXT_CLIENT, snd_seq_ioctl_query_next_client }, 2185 { SNDRV_SEQ_IOCTL_QUERY_NEXT_PORT, snd_seq_ioctl_query_next_port }, 2186 { SNDRV_SEQ_IOCTL_REMOVE_EVENTS, snd_seq_ioctl_remove_events }, 2187 { SNDRV_SEQ_IOCTL_QUERY_SUBS, snd_seq_ioctl_query_subs }, 2188 { 0, NULL }, 2189 }; 2190 2191 static int snd_seq_do_ioctl(struct snd_seq_client *client, unsigned int cmd, 2192 void __user *arg) 2193 { 2194 struct seq_ioctl_table *p; 2195 2196 switch (cmd) { 2197 case SNDRV_SEQ_IOCTL_PVERSION: 2198 /* return sequencer version number */ 2199 return put_user(SNDRV_SEQ_VERSION, (int __user *)arg) ? -EFAULT : 0; 2200 case SNDRV_SEQ_IOCTL_CLIENT_ID: 2201 /* return the id of this client */ 2202 return put_user(client->number, (int __user *)arg) ? -EFAULT : 0; 2203 } 2204 2205 if (! arg) 2206 return -EFAULT; 2207 for (p = ioctl_tables; p->cmd; p++) { 2208 if (p->cmd == cmd) 2209 return p->func(client, arg); 2210 } 2211 pr_debug("ALSA: seq unknown ioctl() 0x%x (type='%c', number=0x%02x)\n", 2212 cmd, _IOC_TYPE(cmd), _IOC_NR(cmd)); 2213 return -ENOTTY; 2214 } 2215 2216 2217 static long snd_seq_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 2218 { 2219 struct snd_seq_client *client = file->private_data; 2220 2221 if (snd_BUG_ON(!client)) 2222 return -ENXIO; 2223 2224 return snd_seq_do_ioctl(client, cmd, (void __user *) arg); 2225 } 2226 2227 #ifdef CONFIG_COMPAT 2228 #include "seq_compat.c" 2229 #else 2230 #define snd_seq_ioctl_compat NULL 2231 #endif 2232 2233 /* -------------------------------------------------------- */ 2234 2235 2236 /* exported to kernel modules */ 2237 int snd_seq_create_kernel_client(struct snd_card *card, int client_index, 2238 const char *name_fmt, ...) 2239 { 2240 struct snd_seq_client *client; 2241 va_list args; 2242 2243 if (snd_BUG_ON(in_interrupt())) 2244 return -EBUSY; 2245 2246 if (card && client_index >= SNDRV_SEQ_CLIENTS_PER_CARD) 2247 return -EINVAL; 2248 if (card == NULL && client_index >= SNDRV_SEQ_GLOBAL_CLIENTS) 2249 return -EINVAL; 2250 2251 if (mutex_lock_interruptible(®ister_mutex)) 2252 return -ERESTARTSYS; 2253 2254 if (card) { 2255 client_index += SNDRV_SEQ_GLOBAL_CLIENTS 2256 + card->number * SNDRV_SEQ_CLIENTS_PER_CARD; 2257 if (client_index >= SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN) 2258 client_index = -1; 2259 } 2260 2261 /* empty write queue as default */ 2262 client = seq_create_client1(client_index, 0); 2263 if (client == NULL) { 2264 mutex_unlock(®ister_mutex); 2265 return -EBUSY; /* failure code */ 2266 } 2267 usage_alloc(&client_usage, 1); 2268 2269 client->accept_input = 1; 2270 client->accept_output = 1; 2271 2272 va_start(args, name_fmt); 2273 vsnprintf(client->name, sizeof(client->name), name_fmt, args); 2274 va_end(args); 2275 2276 client->type = KERNEL_CLIENT; 2277 mutex_unlock(®ister_mutex); 2278 2279 /* make others aware this new client */ 2280 snd_seq_system_client_ev_client_start(client->number); 2281 2282 /* return client number to caller */ 2283 return client->number; 2284 } 2285 2286 EXPORT_SYMBOL(snd_seq_create_kernel_client); 2287 2288 /* exported to kernel modules */ 2289 int snd_seq_delete_kernel_client(int client) 2290 { 2291 struct snd_seq_client *ptr; 2292 2293 if (snd_BUG_ON(in_interrupt())) 2294 return -EBUSY; 2295 2296 ptr = clientptr(client); 2297 if (ptr == NULL) 2298 return -EINVAL; 2299 2300 seq_free_client(ptr); 2301 kfree(ptr); 2302 return 0; 2303 } 2304 2305 EXPORT_SYMBOL(snd_seq_delete_kernel_client); 2306 2307 /* skeleton to enqueue event, called from snd_seq_kernel_client_enqueue 2308 * and snd_seq_kernel_client_enqueue_blocking 2309 */ 2310 static int kernel_client_enqueue(int client, struct snd_seq_event *ev, 2311 struct file *file, int blocking, 2312 int atomic, int hop) 2313 { 2314 struct snd_seq_client *cptr; 2315 int result; 2316 2317 if (snd_BUG_ON(!ev)) 2318 return -EINVAL; 2319 2320 if (ev->type == SNDRV_SEQ_EVENT_NONE) 2321 return 0; /* ignore this */ 2322 if (ev->type == SNDRV_SEQ_EVENT_KERNEL_ERROR) 2323 return -EINVAL; /* quoted events can't be enqueued */ 2324 2325 /* fill in client number */ 2326 ev->source.client = client; 2327 2328 if (check_event_type_and_length(ev)) 2329 return -EINVAL; 2330 2331 cptr = snd_seq_client_use_ptr(client); 2332 if (cptr == NULL) 2333 return -EINVAL; 2334 2335 if (! cptr->accept_output) 2336 result = -EPERM; 2337 else /* send it */ 2338 result = snd_seq_client_enqueue_event(cptr, ev, file, blocking, atomic, hop); 2339 2340 snd_seq_client_unlock(cptr); 2341 return result; 2342 } 2343 2344 /* 2345 * exported, called by kernel clients to enqueue events (w/o blocking) 2346 * 2347 * RETURN VALUE: zero if succeed, negative if error 2348 */ 2349 int snd_seq_kernel_client_enqueue(int client, struct snd_seq_event * ev, 2350 int atomic, int hop) 2351 { 2352 return kernel_client_enqueue(client, ev, NULL, 0, atomic, hop); 2353 } 2354 2355 EXPORT_SYMBOL(snd_seq_kernel_client_enqueue); 2356 2357 /* 2358 * exported, called by kernel clients to enqueue events (with blocking) 2359 * 2360 * RETURN VALUE: zero if succeed, negative if error 2361 */ 2362 int snd_seq_kernel_client_enqueue_blocking(int client, struct snd_seq_event * ev, 2363 struct file *file, 2364 int atomic, int hop) 2365 { 2366 return kernel_client_enqueue(client, ev, file, 1, atomic, hop); 2367 } 2368 2369 EXPORT_SYMBOL(snd_seq_kernel_client_enqueue_blocking); 2370 2371 /* 2372 * exported, called by kernel clients to dispatch events directly to other 2373 * clients, bypassing the queues. Event time-stamp will be updated. 2374 * 2375 * RETURN VALUE: negative = delivery failed, 2376 * zero, or positive: the number of delivered events 2377 */ 2378 int snd_seq_kernel_client_dispatch(int client, struct snd_seq_event * ev, 2379 int atomic, int hop) 2380 { 2381 struct snd_seq_client *cptr; 2382 int result; 2383 2384 if (snd_BUG_ON(!ev)) 2385 return -EINVAL; 2386 2387 /* fill in client number */ 2388 ev->queue = SNDRV_SEQ_QUEUE_DIRECT; 2389 ev->source.client = client; 2390 2391 if (check_event_type_and_length(ev)) 2392 return -EINVAL; 2393 2394 cptr = snd_seq_client_use_ptr(client); 2395 if (cptr == NULL) 2396 return -EINVAL; 2397 2398 if (!cptr->accept_output) 2399 result = -EPERM; 2400 else 2401 result = snd_seq_deliver_event(cptr, ev, atomic, hop); 2402 2403 snd_seq_client_unlock(cptr); 2404 return result; 2405 } 2406 2407 EXPORT_SYMBOL(snd_seq_kernel_client_dispatch); 2408 2409 /* 2410 * exported, called by kernel clients to perform same functions as with 2411 * userland ioctl() 2412 */ 2413 int snd_seq_kernel_client_ctl(int clientid, unsigned int cmd, void *arg) 2414 { 2415 struct snd_seq_client *client; 2416 mm_segment_t fs; 2417 int result; 2418 2419 client = clientptr(clientid); 2420 if (client == NULL) 2421 return -ENXIO; 2422 fs = snd_enter_user(); 2423 result = snd_seq_do_ioctl(client, cmd, (void __force __user *)arg); 2424 snd_leave_user(fs); 2425 return result; 2426 } 2427 2428 EXPORT_SYMBOL(snd_seq_kernel_client_ctl); 2429 2430 /* exported (for OSS emulator) */ 2431 int snd_seq_kernel_client_write_poll(int clientid, struct file *file, poll_table *wait) 2432 { 2433 struct snd_seq_client *client; 2434 2435 client = clientptr(clientid); 2436 if (client == NULL) 2437 return -ENXIO; 2438 2439 if (! snd_seq_write_pool_allocated(client)) 2440 return 1; 2441 if (snd_seq_pool_poll_wait(client->pool, file, wait)) 2442 return 1; 2443 return 0; 2444 } 2445 2446 EXPORT_SYMBOL(snd_seq_kernel_client_write_poll); 2447 2448 /*---------------------------------------------------------------------------*/ 2449 2450 #ifdef CONFIG_SND_PROC_FS 2451 /* 2452 * /proc interface 2453 */ 2454 static void snd_seq_info_dump_subscribers(struct snd_info_buffer *buffer, 2455 struct snd_seq_port_subs_info *group, 2456 int is_src, char *msg) 2457 { 2458 struct list_head *p; 2459 struct snd_seq_subscribers *s; 2460 int count = 0; 2461 2462 down_read(&group->list_mutex); 2463 if (list_empty(&group->list_head)) { 2464 up_read(&group->list_mutex); 2465 return; 2466 } 2467 snd_iprintf(buffer, msg); 2468 list_for_each(p, &group->list_head) { 2469 if (is_src) 2470 s = list_entry(p, struct snd_seq_subscribers, src_list); 2471 else 2472 s = list_entry(p, struct snd_seq_subscribers, dest_list); 2473 if (count++) 2474 snd_iprintf(buffer, ", "); 2475 snd_iprintf(buffer, "%d:%d", 2476 is_src ? s->info.dest.client : s->info.sender.client, 2477 is_src ? s->info.dest.port : s->info.sender.port); 2478 if (s->info.flags & SNDRV_SEQ_PORT_SUBS_TIMESTAMP) 2479 snd_iprintf(buffer, "[%c:%d]", ((s->info.flags & SNDRV_SEQ_PORT_SUBS_TIME_REAL) ? 'r' : 't'), s->info.queue); 2480 if (group->exclusive) 2481 snd_iprintf(buffer, "[ex]"); 2482 } 2483 up_read(&group->list_mutex); 2484 snd_iprintf(buffer, "\n"); 2485 } 2486 2487 #define FLAG_PERM_RD(perm) ((perm) & SNDRV_SEQ_PORT_CAP_READ ? ((perm) & SNDRV_SEQ_PORT_CAP_SUBS_READ ? 'R' : 'r') : '-') 2488 #define FLAG_PERM_WR(perm) ((perm) & SNDRV_SEQ_PORT_CAP_WRITE ? ((perm) & SNDRV_SEQ_PORT_CAP_SUBS_WRITE ? 'W' : 'w') : '-') 2489 #define FLAG_PERM_EX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_NO_EXPORT ? '-' : 'e') 2490 2491 #define FLAG_PERM_DUPLEX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_DUPLEX ? 'X' : '-') 2492 2493 static void snd_seq_info_dump_ports(struct snd_info_buffer *buffer, 2494 struct snd_seq_client *client) 2495 { 2496 struct snd_seq_client_port *p; 2497 2498 mutex_lock(&client->ports_mutex); 2499 list_for_each_entry(p, &client->ports_list_head, list) { 2500 snd_iprintf(buffer, " Port %3d : \"%s\" (%c%c%c%c)\n", 2501 p->addr.port, p->name, 2502 FLAG_PERM_RD(p->capability), 2503 FLAG_PERM_WR(p->capability), 2504 FLAG_PERM_EX(p->capability), 2505 FLAG_PERM_DUPLEX(p->capability)); 2506 snd_seq_info_dump_subscribers(buffer, &p->c_src, 1, " Connecting To: "); 2507 snd_seq_info_dump_subscribers(buffer, &p->c_dest, 0, " Connected From: "); 2508 } 2509 mutex_unlock(&client->ports_mutex); 2510 } 2511 2512 2513 /* exported to seq_info.c */ 2514 void snd_seq_info_clients_read(struct snd_info_entry *entry, 2515 struct snd_info_buffer *buffer) 2516 { 2517 int c; 2518 struct snd_seq_client *client; 2519 2520 snd_iprintf(buffer, "Client info\n"); 2521 snd_iprintf(buffer, " cur clients : %d\n", client_usage.cur); 2522 snd_iprintf(buffer, " peak clients : %d\n", client_usage.peak); 2523 snd_iprintf(buffer, " max clients : %d\n", SNDRV_SEQ_MAX_CLIENTS); 2524 snd_iprintf(buffer, "\n"); 2525 2526 /* list the client table */ 2527 for (c = 0; c < SNDRV_SEQ_MAX_CLIENTS; c++) { 2528 client = snd_seq_client_use_ptr(c); 2529 if (client == NULL) 2530 continue; 2531 if (client->type == NO_CLIENT) { 2532 snd_seq_client_unlock(client); 2533 continue; 2534 } 2535 2536 snd_iprintf(buffer, "Client %3d : \"%s\" [%s]\n", 2537 c, client->name, 2538 client->type == USER_CLIENT ? "User" : "Kernel"); 2539 snd_seq_info_dump_ports(buffer, client); 2540 if (snd_seq_write_pool_allocated(client)) { 2541 snd_iprintf(buffer, " Output pool :\n"); 2542 snd_seq_info_pool(buffer, client->pool, " "); 2543 } 2544 if (client->type == USER_CLIENT && client->data.user.fifo && 2545 client->data.user.fifo->pool) { 2546 snd_iprintf(buffer, " Input pool :\n"); 2547 snd_seq_info_pool(buffer, client->data.user.fifo->pool, " "); 2548 } 2549 snd_seq_client_unlock(client); 2550 } 2551 } 2552 #endif /* CONFIG_SND_PROC_FS */ 2553 2554 /*---------------------------------------------------------------------------*/ 2555 2556 2557 /* 2558 * REGISTRATION PART 2559 */ 2560 2561 static const struct file_operations snd_seq_f_ops = 2562 { 2563 .owner = THIS_MODULE, 2564 .read = snd_seq_read, 2565 .write = snd_seq_write, 2566 .open = snd_seq_open, 2567 .release = snd_seq_release, 2568 .llseek = no_llseek, 2569 .poll = snd_seq_poll, 2570 .unlocked_ioctl = snd_seq_ioctl, 2571 .compat_ioctl = snd_seq_ioctl_compat, 2572 }; 2573 2574 static struct device seq_dev; 2575 2576 /* 2577 * register sequencer device 2578 */ 2579 int __init snd_sequencer_device_init(void) 2580 { 2581 int err; 2582 2583 snd_device_initialize(&seq_dev, NULL); 2584 dev_set_name(&seq_dev, "seq"); 2585 2586 if (mutex_lock_interruptible(®ister_mutex)) 2587 return -ERESTARTSYS; 2588 2589 err = snd_register_device(SNDRV_DEVICE_TYPE_SEQUENCER, NULL, 0, 2590 &snd_seq_f_ops, NULL, &seq_dev); 2591 if (err < 0) { 2592 mutex_unlock(®ister_mutex); 2593 put_device(&seq_dev); 2594 return err; 2595 } 2596 2597 mutex_unlock(®ister_mutex); 2598 2599 return 0; 2600 } 2601 2602 2603 2604 /* 2605 * unregister sequencer device 2606 */ 2607 void __exit snd_sequencer_device_done(void) 2608 { 2609 snd_unregister_device(&seq_dev); 2610 put_device(&seq_dev); 2611 } 2612