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 /* both ports ready? */ 682 if (atomic_read(&subs->ref_count) != 2) 683 continue; 684 event->dest = subs->info.dest; 685 if (subs->info.flags & SNDRV_SEQ_PORT_SUBS_TIMESTAMP) 686 /* convert time according to flag with subscription */ 687 update_timestamp_of_queue(event, subs->info.queue, 688 subs->info.flags & SNDRV_SEQ_PORT_SUBS_TIME_REAL); 689 err = snd_seq_deliver_single_event(client, event, 690 0, atomic, hop); 691 if (err < 0) { 692 /* save first error that occurs and continue */ 693 if (!result) 694 result = err; 695 continue; 696 } 697 num_ev++; 698 /* restore original event record */ 699 *event = event_saved; 700 } 701 if (atomic) 702 read_unlock(&grp->list_lock); 703 else 704 up_read(&grp->list_mutex); 705 *event = event_saved; /* restore */ 706 snd_seq_port_unlock(src_port); 707 return (result < 0) ? result : num_ev; 708 } 709 710 711 #ifdef SUPPORT_BROADCAST 712 /* 713 * broadcast to all ports: 714 */ 715 static int port_broadcast_event(struct snd_seq_client *client, 716 struct snd_seq_event *event, 717 int atomic, int hop) 718 { 719 int num_ev = 0, err, result = 0; 720 struct snd_seq_client *dest_client; 721 struct snd_seq_client_port *port; 722 723 dest_client = get_event_dest_client(event, SNDRV_SEQ_FILTER_BROADCAST); 724 if (dest_client == NULL) 725 return 0; /* no matching destination */ 726 727 read_lock(&dest_client->ports_lock); 728 list_for_each_entry(port, &dest_client->ports_list_head, list) { 729 event->dest.port = port->addr.port; 730 /* pass NULL as source client to avoid error bounce */ 731 err = snd_seq_deliver_single_event(NULL, event, 732 SNDRV_SEQ_FILTER_BROADCAST, 733 atomic, hop); 734 if (err < 0) { 735 /* save first error that occurs and continue */ 736 if (!result) 737 result = err; 738 continue; 739 } 740 num_ev++; 741 } 742 read_unlock(&dest_client->ports_lock); 743 snd_seq_client_unlock(dest_client); 744 event->dest.port = SNDRV_SEQ_ADDRESS_BROADCAST; /* restore */ 745 return (result < 0) ? result : num_ev; 746 } 747 748 /* 749 * send the event to all clients: 750 * if destination port is also ADDRESS_BROADCAST, deliver to all ports. 751 */ 752 static int broadcast_event(struct snd_seq_client *client, 753 struct snd_seq_event *event, int atomic, int hop) 754 { 755 int err, result = 0, num_ev = 0; 756 int dest; 757 struct snd_seq_addr addr; 758 759 addr = event->dest; /* save */ 760 761 for (dest = 0; dest < SNDRV_SEQ_MAX_CLIENTS; dest++) { 762 /* don't send to itself */ 763 if (dest == client->number) 764 continue; 765 event->dest.client = dest; 766 event->dest.port = addr.port; 767 if (addr.port == SNDRV_SEQ_ADDRESS_BROADCAST) 768 err = port_broadcast_event(client, event, atomic, hop); 769 else 770 /* pass NULL as source client to avoid error bounce */ 771 err = snd_seq_deliver_single_event(NULL, event, 772 SNDRV_SEQ_FILTER_BROADCAST, 773 atomic, hop); 774 if (err < 0) { 775 /* save first error that occurs and continue */ 776 if (!result) 777 result = err; 778 continue; 779 } 780 num_ev += err; 781 } 782 event->dest = addr; /* restore */ 783 return (result < 0) ? result : num_ev; 784 } 785 786 787 /* multicast - not supported yet */ 788 static int multicast_event(struct snd_seq_client *client, struct snd_seq_event *event, 789 int atomic, int hop) 790 { 791 pr_debug("ALSA: seq: multicast not supported yet.\n"); 792 return 0; /* ignored */ 793 } 794 #endif /* SUPPORT_BROADCAST */ 795 796 797 /* deliver an event to the destination port(s). 798 * if the event is to subscribers or broadcast, the event is dispatched 799 * to multiple targets. 800 * 801 * RETURN VALUE: n > 0 : the number of delivered events. 802 * n == 0 : the event was not passed to any client. 803 * n < 0 : error - event was not processed. 804 */ 805 static int snd_seq_deliver_event(struct snd_seq_client *client, struct snd_seq_event *event, 806 int atomic, int hop) 807 { 808 int result; 809 810 hop++; 811 if (hop >= SNDRV_SEQ_MAX_HOPS) { 812 pr_debug("ALSA: seq: too long delivery path (%d:%d->%d:%d)\n", 813 event->source.client, event->source.port, 814 event->dest.client, event->dest.port); 815 return -EMLINK; 816 } 817 818 if (event->queue == SNDRV_SEQ_ADDRESS_SUBSCRIBERS || 819 event->dest.client == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) 820 result = deliver_to_subscribers(client, event, atomic, hop); 821 #ifdef SUPPORT_BROADCAST 822 else if (event->queue == SNDRV_SEQ_ADDRESS_BROADCAST || 823 event->dest.client == SNDRV_SEQ_ADDRESS_BROADCAST) 824 result = broadcast_event(client, event, atomic, hop); 825 else if (event->dest.client >= SNDRV_SEQ_MAX_CLIENTS) 826 result = multicast_event(client, event, atomic, hop); 827 else if (event->dest.port == SNDRV_SEQ_ADDRESS_BROADCAST) 828 result = port_broadcast_event(client, event, atomic, hop); 829 #endif 830 else 831 result = snd_seq_deliver_single_event(client, event, 0, atomic, hop); 832 833 return result; 834 } 835 836 /* 837 * dispatch an event cell: 838 * This function is called only from queue check routines in timer 839 * interrupts or after enqueued. 840 * The event cell shall be released or re-queued in this function. 841 * 842 * RETURN VALUE: n > 0 : the number of delivered events. 843 * n == 0 : the event was not passed to any client. 844 * n < 0 : error - event was not processed. 845 */ 846 int snd_seq_dispatch_event(struct snd_seq_event_cell *cell, int atomic, int hop) 847 { 848 struct snd_seq_client *client; 849 int result; 850 851 if (snd_BUG_ON(!cell)) 852 return -EINVAL; 853 854 client = snd_seq_client_use_ptr(cell->event.source.client); 855 if (client == NULL) { 856 snd_seq_cell_free(cell); /* release this cell */ 857 return -EINVAL; 858 } 859 860 if (cell->event.type == SNDRV_SEQ_EVENT_NOTE) { 861 /* NOTE event: 862 * the event cell is re-used as a NOTE-OFF event and 863 * enqueued again. 864 */ 865 struct snd_seq_event tmpev, *ev; 866 867 /* reserve this event to enqueue note-off later */ 868 tmpev = cell->event; 869 tmpev.type = SNDRV_SEQ_EVENT_NOTEON; 870 result = snd_seq_deliver_event(client, &tmpev, atomic, hop); 871 872 /* 873 * This was originally a note event. We now re-use the 874 * cell for the note-off event. 875 */ 876 877 ev = &cell->event; 878 ev->type = SNDRV_SEQ_EVENT_NOTEOFF; 879 ev->flags |= SNDRV_SEQ_PRIORITY_HIGH; 880 881 /* add the duration time */ 882 switch (ev->flags & SNDRV_SEQ_TIME_STAMP_MASK) { 883 case SNDRV_SEQ_TIME_STAMP_TICK: 884 ev->time.tick += ev->data.note.duration; 885 break; 886 case SNDRV_SEQ_TIME_STAMP_REAL: 887 /* unit for duration is ms */ 888 ev->time.time.tv_nsec += 1000000 * (ev->data.note.duration % 1000); 889 ev->time.time.tv_sec += ev->data.note.duration / 1000 + 890 ev->time.time.tv_nsec / 1000000000; 891 ev->time.time.tv_nsec %= 1000000000; 892 break; 893 } 894 ev->data.note.velocity = ev->data.note.off_velocity; 895 896 /* Now queue this cell as the note off event */ 897 if (snd_seq_enqueue_event(cell, atomic, hop) < 0) 898 snd_seq_cell_free(cell); /* release this cell */ 899 900 } else { 901 /* Normal events: 902 * event cell is freed after processing the event 903 */ 904 905 result = snd_seq_deliver_event(client, &cell->event, atomic, hop); 906 snd_seq_cell_free(cell); 907 } 908 909 snd_seq_client_unlock(client); 910 return result; 911 } 912 913 914 /* Allocate a cell from client pool and enqueue it to queue: 915 * if pool is empty and blocking is TRUE, sleep until a new cell is 916 * available. 917 */ 918 static int snd_seq_client_enqueue_event(struct snd_seq_client *client, 919 struct snd_seq_event *event, 920 struct file *file, int blocking, 921 int atomic, int hop) 922 { 923 struct snd_seq_event_cell *cell; 924 int err; 925 926 /* special queue values - force direct passing */ 927 if (event->queue == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) { 928 event->dest.client = SNDRV_SEQ_ADDRESS_SUBSCRIBERS; 929 event->queue = SNDRV_SEQ_QUEUE_DIRECT; 930 } else 931 #ifdef SUPPORT_BROADCAST 932 if (event->queue == SNDRV_SEQ_ADDRESS_BROADCAST) { 933 event->dest.client = SNDRV_SEQ_ADDRESS_BROADCAST; 934 event->queue = SNDRV_SEQ_QUEUE_DIRECT; 935 } 936 #endif 937 if (event->dest.client == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) { 938 /* check presence of source port */ 939 struct snd_seq_client_port *src_port = snd_seq_port_use_ptr(client, event->source.port); 940 if (src_port == NULL) 941 return -EINVAL; 942 snd_seq_port_unlock(src_port); 943 } 944 945 /* direct event processing without enqueued */ 946 if (snd_seq_ev_is_direct(event)) { 947 if (event->type == SNDRV_SEQ_EVENT_NOTE) 948 return -EINVAL; /* this event must be enqueued! */ 949 return snd_seq_deliver_event(client, event, atomic, hop); 950 } 951 952 /* Not direct, normal queuing */ 953 if (snd_seq_queue_is_used(event->queue, client->number) <= 0) 954 return -EINVAL; /* invalid queue */ 955 if (! snd_seq_write_pool_allocated(client)) 956 return -ENXIO; /* queue is not allocated */ 957 958 /* allocate an event cell */ 959 err = snd_seq_event_dup(client->pool, event, &cell, !blocking || atomic, file); 960 if (err < 0) 961 return err; 962 963 /* we got a cell. enqueue it. */ 964 if ((err = snd_seq_enqueue_event(cell, atomic, hop)) < 0) { 965 snd_seq_cell_free(cell); 966 return err; 967 } 968 969 return 0; 970 } 971 972 973 /* 974 * check validity of event type and data length. 975 * return non-zero if invalid. 976 */ 977 static int check_event_type_and_length(struct snd_seq_event *ev) 978 { 979 switch (snd_seq_ev_length_type(ev)) { 980 case SNDRV_SEQ_EVENT_LENGTH_FIXED: 981 if (snd_seq_ev_is_variable_type(ev)) 982 return -EINVAL; 983 break; 984 case SNDRV_SEQ_EVENT_LENGTH_VARIABLE: 985 if (! snd_seq_ev_is_variable_type(ev) || 986 (ev->data.ext.len & ~SNDRV_SEQ_EXT_MASK) >= SNDRV_SEQ_MAX_EVENT_LEN) 987 return -EINVAL; 988 break; 989 case SNDRV_SEQ_EVENT_LENGTH_VARUSR: 990 if (! snd_seq_ev_is_direct(ev)) 991 return -EINVAL; 992 break; 993 } 994 return 0; 995 } 996 997 998 /* handle write() */ 999 /* possible error values: 1000 * -ENXIO invalid client or file open mode 1001 * -ENOMEM malloc failed 1002 * -EFAULT seg. fault during copy from user space 1003 * -EINVAL invalid event 1004 * -EAGAIN no space in output pool 1005 * -EINTR interrupts while sleep 1006 * -EMLINK too many hops 1007 * others depends on return value from driver callback 1008 */ 1009 static ssize_t snd_seq_write(struct file *file, const char __user *buf, 1010 size_t count, loff_t *offset) 1011 { 1012 struct snd_seq_client *client = file->private_data; 1013 int written = 0, len; 1014 int err = -EINVAL; 1015 struct snd_seq_event event; 1016 1017 if (!(snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT)) 1018 return -ENXIO; 1019 1020 /* check client structures are in place */ 1021 if (snd_BUG_ON(!client)) 1022 return -ENXIO; 1023 1024 if (!client->accept_output || client->pool == NULL) 1025 return -ENXIO; 1026 1027 /* allocate the pool now if the pool is not allocated yet */ 1028 if (client->pool->size > 0 && !snd_seq_write_pool_allocated(client)) { 1029 if (snd_seq_pool_init(client->pool) < 0) 1030 return -ENOMEM; 1031 } 1032 1033 /* only process whole events */ 1034 while (count >= sizeof(struct snd_seq_event)) { 1035 /* Read in the event header from the user */ 1036 len = sizeof(event); 1037 if (copy_from_user(&event, buf, len)) { 1038 err = -EFAULT; 1039 break; 1040 } 1041 event.source.client = client->number; /* fill in client number */ 1042 /* Check for extension data length */ 1043 if (check_event_type_and_length(&event)) { 1044 err = -EINVAL; 1045 break; 1046 } 1047 1048 /* check for special events */ 1049 if (event.type == SNDRV_SEQ_EVENT_NONE) 1050 goto __skip_event; 1051 else if (snd_seq_ev_is_reserved(&event)) { 1052 err = -EINVAL; 1053 break; 1054 } 1055 1056 if (snd_seq_ev_is_variable(&event)) { 1057 int extlen = event.data.ext.len & ~SNDRV_SEQ_EXT_MASK; 1058 if ((size_t)(extlen + len) > count) { 1059 /* back out, will get an error this time or next */ 1060 err = -EINVAL; 1061 break; 1062 } 1063 /* set user space pointer */ 1064 event.data.ext.len = extlen | SNDRV_SEQ_EXT_USRPTR; 1065 event.data.ext.ptr = (char __force *)buf 1066 + sizeof(struct snd_seq_event); 1067 len += extlen; /* increment data length */ 1068 } else { 1069 #ifdef CONFIG_COMPAT 1070 if (client->convert32 && snd_seq_ev_is_varusr(&event)) { 1071 void *ptr = (void __force *)compat_ptr(event.data.raw32.d[1]); 1072 event.data.ext.ptr = ptr; 1073 } 1074 #endif 1075 } 1076 1077 /* ok, enqueue it */ 1078 err = snd_seq_client_enqueue_event(client, &event, file, 1079 !(file->f_flags & O_NONBLOCK), 1080 0, 0); 1081 if (err < 0) 1082 break; 1083 1084 __skip_event: 1085 /* Update pointers and counts */ 1086 count -= len; 1087 buf += len; 1088 written += len; 1089 } 1090 1091 return written ? written : err; 1092 } 1093 1094 1095 /* 1096 * handle polling 1097 */ 1098 static unsigned int snd_seq_poll(struct file *file, poll_table * wait) 1099 { 1100 struct snd_seq_client *client = file->private_data; 1101 unsigned int mask = 0; 1102 1103 /* check client structures are in place */ 1104 if (snd_BUG_ON(!client)) 1105 return -ENXIO; 1106 1107 if ((snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_INPUT) && 1108 client->data.user.fifo) { 1109 1110 /* check if data is available in the outqueue */ 1111 if (snd_seq_fifo_poll_wait(client->data.user.fifo, file, wait)) 1112 mask |= POLLIN | POLLRDNORM; 1113 } 1114 1115 if (snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT) { 1116 1117 /* check if data is available in the pool */ 1118 if (!snd_seq_write_pool_allocated(client) || 1119 snd_seq_pool_poll_wait(client->pool, file, wait)) 1120 mask |= POLLOUT | POLLWRNORM; 1121 } 1122 1123 return mask; 1124 } 1125 1126 1127 /*-----------------------------------------------------*/ 1128 1129 1130 /* SYSTEM_INFO ioctl() */ 1131 static int snd_seq_ioctl_system_info(struct snd_seq_client *client, void __user *arg) 1132 { 1133 struct snd_seq_system_info info; 1134 1135 memset(&info, 0, sizeof(info)); 1136 /* fill the info fields */ 1137 info.queues = SNDRV_SEQ_MAX_QUEUES; 1138 info.clients = SNDRV_SEQ_MAX_CLIENTS; 1139 info.ports = SNDRV_SEQ_MAX_PORTS; 1140 info.channels = 256; /* fixed limit */ 1141 info.cur_clients = client_usage.cur; 1142 info.cur_queues = snd_seq_queue_get_cur_queues(); 1143 1144 if (copy_to_user(arg, &info, sizeof(info))) 1145 return -EFAULT; 1146 return 0; 1147 } 1148 1149 1150 /* RUNNING_MODE ioctl() */ 1151 static int snd_seq_ioctl_running_mode(struct snd_seq_client *client, void __user *arg) 1152 { 1153 struct snd_seq_running_info info; 1154 struct snd_seq_client *cptr; 1155 int err = 0; 1156 1157 if (copy_from_user(&info, arg, sizeof(info))) 1158 return -EFAULT; 1159 1160 /* requested client number */ 1161 cptr = snd_seq_client_use_ptr(info.client); 1162 if (cptr == NULL) 1163 return -ENOENT; /* don't change !!! */ 1164 1165 #ifdef SNDRV_BIG_ENDIAN 1166 if (! info.big_endian) { 1167 err = -EINVAL; 1168 goto __err; 1169 } 1170 #else 1171 if (info.big_endian) { 1172 err = -EINVAL; 1173 goto __err; 1174 } 1175 1176 #endif 1177 if (info.cpu_mode > sizeof(long)) { 1178 err = -EINVAL; 1179 goto __err; 1180 } 1181 cptr->convert32 = (info.cpu_mode < sizeof(long)); 1182 __err: 1183 snd_seq_client_unlock(cptr); 1184 return err; 1185 } 1186 1187 /* CLIENT_INFO ioctl() */ 1188 static void get_client_info(struct snd_seq_client *cptr, 1189 struct snd_seq_client_info *info) 1190 { 1191 info->client = cptr->number; 1192 1193 /* fill the info fields */ 1194 info->type = cptr->type; 1195 strcpy(info->name, cptr->name); 1196 info->filter = cptr->filter; 1197 info->event_lost = cptr->event_lost; 1198 memcpy(info->event_filter, cptr->event_filter, 32); 1199 info->num_ports = cptr->num_ports; 1200 memset(info->reserved, 0, sizeof(info->reserved)); 1201 } 1202 1203 static int snd_seq_ioctl_get_client_info(struct snd_seq_client *client, 1204 void __user *arg) 1205 { 1206 struct snd_seq_client *cptr; 1207 struct snd_seq_client_info client_info; 1208 1209 if (copy_from_user(&client_info, arg, sizeof(client_info))) 1210 return -EFAULT; 1211 1212 /* requested client number */ 1213 cptr = snd_seq_client_use_ptr(client_info.client); 1214 if (cptr == NULL) 1215 return -ENOENT; /* don't change !!! */ 1216 1217 get_client_info(cptr, &client_info); 1218 snd_seq_client_unlock(cptr); 1219 1220 if (copy_to_user(arg, &client_info, sizeof(client_info))) 1221 return -EFAULT; 1222 return 0; 1223 } 1224 1225 1226 /* CLIENT_INFO ioctl() */ 1227 static int snd_seq_ioctl_set_client_info(struct snd_seq_client *client, 1228 void __user *arg) 1229 { 1230 struct snd_seq_client_info client_info; 1231 1232 if (copy_from_user(&client_info, arg, sizeof(client_info))) 1233 return -EFAULT; 1234 1235 /* it is not allowed to set the info fields for an another client */ 1236 if (client->number != client_info.client) 1237 return -EPERM; 1238 /* also client type must be set now */ 1239 if (client->type != client_info.type) 1240 return -EINVAL; 1241 1242 /* fill the info fields */ 1243 if (client_info.name[0]) 1244 strlcpy(client->name, client_info.name, sizeof(client->name)); 1245 1246 client->filter = client_info.filter; 1247 client->event_lost = client_info.event_lost; 1248 memcpy(client->event_filter, client_info.event_filter, 32); 1249 1250 return 0; 1251 } 1252 1253 1254 /* 1255 * CREATE PORT ioctl() 1256 */ 1257 static int snd_seq_ioctl_create_port(struct snd_seq_client *client, 1258 void __user *arg) 1259 { 1260 struct snd_seq_client_port *port; 1261 struct snd_seq_port_info info; 1262 struct snd_seq_port_callback *callback; 1263 1264 if (copy_from_user(&info, arg, sizeof(info))) 1265 return -EFAULT; 1266 1267 /* it is not allowed to create the port for an another client */ 1268 if (info.addr.client != client->number) 1269 return -EPERM; 1270 1271 port = snd_seq_create_port(client, (info.flags & SNDRV_SEQ_PORT_FLG_GIVEN_PORT) ? info.addr.port : -1); 1272 if (port == NULL) 1273 return -ENOMEM; 1274 1275 if (client->type == USER_CLIENT && info.kernel) { 1276 snd_seq_delete_port(client, port->addr.port); 1277 return -EINVAL; 1278 } 1279 if (client->type == KERNEL_CLIENT) { 1280 if ((callback = info.kernel) != NULL) { 1281 if (callback->owner) 1282 port->owner = callback->owner; 1283 port->private_data = callback->private_data; 1284 port->private_free = callback->private_free; 1285 port->event_input = callback->event_input; 1286 port->c_src.open = callback->subscribe; 1287 port->c_src.close = callback->unsubscribe; 1288 port->c_dest.open = callback->use; 1289 port->c_dest.close = callback->unuse; 1290 } 1291 } 1292 1293 info.addr = port->addr; 1294 1295 snd_seq_set_port_info(port, &info); 1296 snd_seq_system_client_ev_port_start(port->addr.client, port->addr.port); 1297 1298 if (copy_to_user(arg, &info, sizeof(info))) 1299 return -EFAULT; 1300 1301 return 0; 1302 } 1303 1304 /* 1305 * DELETE PORT ioctl() 1306 */ 1307 static int snd_seq_ioctl_delete_port(struct snd_seq_client *client, 1308 void __user *arg) 1309 { 1310 struct snd_seq_port_info info; 1311 int err; 1312 1313 /* set passed parameters */ 1314 if (copy_from_user(&info, arg, sizeof(info))) 1315 return -EFAULT; 1316 1317 /* it is not allowed to remove the port for an another client */ 1318 if (info.addr.client != client->number) 1319 return -EPERM; 1320 1321 err = snd_seq_delete_port(client, info.addr.port); 1322 if (err >= 0) 1323 snd_seq_system_client_ev_port_exit(client->number, info.addr.port); 1324 return err; 1325 } 1326 1327 1328 /* 1329 * GET_PORT_INFO ioctl() (on any client) 1330 */ 1331 static int snd_seq_ioctl_get_port_info(struct snd_seq_client *client, 1332 void __user *arg) 1333 { 1334 struct snd_seq_client *cptr; 1335 struct snd_seq_client_port *port; 1336 struct snd_seq_port_info info; 1337 1338 if (copy_from_user(&info, arg, sizeof(info))) 1339 return -EFAULT; 1340 cptr = snd_seq_client_use_ptr(info.addr.client); 1341 if (cptr == NULL) 1342 return -ENXIO; 1343 1344 port = snd_seq_port_use_ptr(cptr, info.addr.port); 1345 if (port == NULL) { 1346 snd_seq_client_unlock(cptr); 1347 return -ENOENT; /* don't change */ 1348 } 1349 1350 /* get port info */ 1351 snd_seq_get_port_info(port, &info); 1352 snd_seq_port_unlock(port); 1353 snd_seq_client_unlock(cptr); 1354 1355 if (copy_to_user(arg, &info, sizeof(info))) 1356 return -EFAULT; 1357 return 0; 1358 } 1359 1360 1361 /* 1362 * SET_PORT_INFO ioctl() (only ports on this/own client) 1363 */ 1364 static int snd_seq_ioctl_set_port_info(struct snd_seq_client *client, 1365 void __user *arg) 1366 { 1367 struct snd_seq_client_port *port; 1368 struct snd_seq_port_info info; 1369 1370 if (copy_from_user(&info, arg, sizeof(info))) 1371 return -EFAULT; 1372 1373 if (info.addr.client != client->number) /* only set our own ports ! */ 1374 return -EPERM; 1375 port = snd_seq_port_use_ptr(client, info.addr.port); 1376 if (port) { 1377 snd_seq_set_port_info(port, &info); 1378 snd_seq_port_unlock(port); 1379 } 1380 return 0; 1381 } 1382 1383 1384 /* 1385 * port subscription (connection) 1386 */ 1387 #define PERM_RD (SNDRV_SEQ_PORT_CAP_READ|SNDRV_SEQ_PORT_CAP_SUBS_READ) 1388 #define PERM_WR (SNDRV_SEQ_PORT_CAP_WRITE|SNDRV_SEQ_PORT_CAP_SUBS_WRITE) 1389 1390 static int check_subscription_permission(struct snd_seq_client *client, 1391 struct snd_seq_client_port *sport, 1392 struct snd_seq_client_port *dport, 1393 struct snd_seq_port_subscribe *subs) 1394 { 1395 if (client->number != subs->sender.client && 1396 client->number != subs->dest.client) { 1397 /* connection by third client - check export permission */ 1398 if (check_port_perm(sport, SNDRV_SEQ_PORT_CAP_NO_EXPORT)) 1399 return -EPERM; 1400 if (check_port_perm(dport, SNDRV_SEQ_PORT_CAP_NO_EXPORT)) 1401 return -EPERM; 1402 } 1403 1404 /* check read permission */ 1405 /* if sender or receiver is the subscribing client itself, 1406 * no permission check is necessary 1407 */ 1408 if (client->number != subs->sender.client) { 1409 if (! check_port_perm(sport, PERM_RD)) 1410 return -EPERM; 1411 } 1412 /* check write permission */ 1413 if (client->number != subs->dest.client) { 1414 if (! check_port_perm(dport, PERM_WR)) 1415 return -EPERM; 1416 } 1417 return 0; 1418 } 1419 1420 /* 1421 * send an subscription notify event to user client: 1422 * client must be user client. 1423 */ 1424 int snd_seq_client_notify_subscription(int client, int port, 1425 struct snd_seq_port_subscribe *info, 1426 int evtype) 1427 { 1428 struct snd_seq_event event; 1429 1430 memset(&event, 0, sizeof(event)); 1431 event.type = evtype; 1432 event.data.connect.dest = info->dest; 1433 event.data.connect.sender = info->sender; 1434 1435 return snd_seq_system_notify(client, port, &event); /* non-atomic */ 1436 } 1437 1438 1439 /* 1440 * add to port's subscription list IOCTL interface 1441 */ 1442 static int snd_seq_ioctl_subscribe_port(struct snd_seq_client *client, 1443 void __user *arg) 1444 { 1445 int result = -EINVAL; 1446 struct snd_seq_client *receiver = NULL, *sender = NULL; 1447 struct snd_seq_client_port *sport = NULL, *dport = NULL; 1448 struct snd_seq_port_subscribe subs; 1449 1450 if (copy_from_user(&subs, arg, sizeof(subs))) 1451 return -EFAULT; 1452 1453 if ((receiver = snd_seq_client_use_ptr(subs.dest.client)) == NULL) 1454 goto __end; 1455 if ((sender = snd_seq_client_use_ptr(subs.sender.client)) == NULL) 1456 goto __end; 1457 if ((sport = snd_seq_port_use_ptr(sender, subs.sender.port)) == NULL) 1458 goto __end; 1459 if ((dport = snd_seq_port_use_ptr(receiver, subs.dest.port)) == NULL) 1460 goto __end; 1461 1462 result = check_subscription_permission(client, sport, dport, &subs); 1463 if (result < 0) 1464 goto __end; 1465 1466 /* connect them */ 1467 result = snd_seq_port_connect(client, sender, sport, receiver, dport, &subs); 1468 if (! result) /* broadcast announce */ 1469 snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0, 1470 &subs, SNDRV_SEQ_EVENT_PORT_SUBSCRIBED); 1471 __end: 1472 if (sport) 1473 snd_seq_port_unlock(sport); 1474 if (dport) 1475 snd_seq_port_unlock(dport); 1476 if (sender) 1477 snd_seq_client_unlock(sender); 1478 if (receiver) 1479 snd_seq_client_unlock(receiver); 1480 return result; 1481 } 1482 1483 1484 /* 1485 * remove from port's subscription list 1486 */ 1487 static int snd_seq_ioctl_unsubscribe_port(struct snd_seq_client *client, 1488 void __user *arg) 1489 { 1490 int result = -ENXIO; 1491 struct snd_seq_client *receiver = NULL, *sender = NULL; 1492 struct snd_seq_client_port *sport = NULL, *dport = NULL; 1493 struct snd_seq_port_subscribe subs; 1494 1495 if (copy_from_user(&subs, arg, sizeof(subs))) 1496 return -EFAULT; 1497 1498 if ((receiver = snd_seq_client_use_ptr(subs.dest.client)) == NULL) 1499 goto __end; 1500 if ((sender = snd_seq_client_use_ptr(subs.sender.client)) == NULL) 1501 goto __end; 1502 if ((sport = snd_seq_port_use_ptr(sender, subs.sender.port)) == NULL) 1503 goto __end; 1504 if ((dport = snd_seq_port_use_ptr(receiver, subs.dest.port)) == NULL) 1505 goto __end; 1506 1507 result = check_subscription_permission(client, sport, dport, &subs); 1508 if (result < 0) 1509 goto __end; 1510 1511 result = snd_seq_port_disconnect(client, sender, sport, receiver, dport, &subs); 1512 if (! result) /* broadcast announce */ 1513 snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0, 1514 &subs, SNDRV_SEQ_EVENT_PORT_UNSUBSCRIBED); 1515 __end: 1516 if (sport) 1517 snd_seq_port_unlock(sport); 1518 if (dport) 1519 snd_seq_port_unlock(dport); 1520 if (sender) 1521 snd_seq_client_unlock(sender); 1522 if (receiver) 1523 snd_seq_client_unlock(receiver); 1524 return result; 1525 } 1526 1527 1528 /* CREATE_QUEUE ioctl() */ 1529 static int snd_seq_ioctl_create_queue(struct snd_seq_client *client, 1530 void __user *arg) 1531 { 1532 struct snd_seq_queue_info info; 1533 int result; 1534 struct snd_seq_queue *q; 1535 1536 if (copy_from_user(&info, arg, sizeof(info))) 1537 return -EFAULT; 1538 1539 result = snd_seq_queue_alloc(client->number, info.locked, info.flags); 1540 if (result < 0) 1541 return result; 1542 1543 q = queueptr(result); 1544 if (q == NULL) 1545 return -EINVAL; 1546 1547 info.queue = q->queue; 1548 info.locked = q->locked; 1549 info.owner = q->owner; 1550 1551 /* set queue name */ 1552 if (! info.name[0]) 1553 snprintf(info.name, sizeof(info.name), "Queue-%d", q->queue); 1554 strlcpy(q->name, info.name, sizeof(q->name)); 1555 queuefree(q); 1556 1557 if (copy_to_user(arg, &info, sizeof(info))) 1558 return -EFAULT; 1559 1560 return 0; 1561 } 1562 1563 /* DELETE_QUEUE ioctl() */ 1564 static int snd_seq_ioctl_delete_queue(struct snd_seq_client *client, 1565 void __user *arg) 1566 { 1567 struct snd_seq_queue_info info; 1568 1569 if (copy_from_user(&info, arg, sizeof(info))) 1570 return -EFAULT; 1571 1572 return snd_seq_queue_delete(client->number, info.queue); 1573 } 1574 1575 /* GET_QUEUE_INFO ioctl() */ 1576 static int snd_seq_ioctl_get_queue_info(struct snd_seq_client *client, 1577 void __user *arg) 1578 { 1579 struct snd_seq_queue_info info; 1580 struct snd_seq_queue *q; 1581 1582 if (copy_from_user(&info, arg, sizeof(info))) 1583 return -EFAULT; 1584 1585 q = queueptr(info.queue); 1586 if (q == NULL) 1587 return -EINVAL; 1588 1589 memset(&info, 0, sizeof(info)); 1590 info.queue = q->queue; 1591 info.owner = q->owner; 1592 info.locked = q->locked; 1593 strlcpy(info.name, q->name, sizeof(info.name)); 1594 queuefree(q); 1595 1596 if (copy_to_user(arg, &info, sizeof(info))) 1597 return -EFAULT; 1598 1599 return 0; 1600 } 1601 1602 /* SET_QUEUE_INFO ioctl() */ 1603 static int snd_seq_ioctl_set_queue_info(struct snd_seq_client *client, 1604 void __user *arg) 1605 { 1606 struct snd_seq_queue_info info; 1607 struct snd_seq_queue *q; 1608 1609 if (copy_from_user(&info, arg, sizeof(info))) 1610 return -EFAULT; 1611 1612 if (info.owner != client->number) 1613 return -EINVAL; 1614 1615 /* change owner/locked permission */ 1616 if (snd_seq_queue_check_access(info.queue, client->number)) { 1617 if (snd_seq_queue_set_owner(info.queue, client->number, info.locked) < 0) 1618 return -EPERM; 1619 if (info.locked) 1620 snd_seq_queue_use(info.queue, client->number, 1); 1621 } else { 1622 return -EPERM; 1623 } 1624 1625 q = queueptr(info.queue); 1626 if (! q) 1627 return -EINVAL; 1628 if (q->owner != client->number) { 1629 queuefree(q); 1630 return -EPERM; 1631 } 1632 strlcpy(q->name, info.name, sizeof(q->name)); 1633 queuefree(q); 1634 1635 return 0; 1636 } 1637 1638 /* GET_NAMED_QUEUE ioctl() */ 1639 static int snd_seq_ioctl_get_named_queue(struct snd_seq_client *client, void __user *arg) 1640 { 1641 struct snd_seq_queue_info info; 1642 struct snd_seq_queue *q; 1643 1644 if (copy_from_user(&info, arg, sizeof(info))) 1645 return -EFAULT; 1646 1647 q = snd_seq_queue_find_name(info.name); 1648 if (q == NULL) 1649 return -EINVAL; 1650 info.queue = q->queue; 1651 info.owner = q->owner; 1652 info.locked = q->locked; 1653 queuefree(q); 1654 1655 if (copy_to_user(arg, &info, sizeof(info))) 1656 return -EFAULT; 1657 1658 return 0; 1659 } 1660 1661 /* GET_QUEUE_STATUS ioctl() */ 1662 static int snd_seq_ioctl_get_queue_status(struct snd_seq_client *client, 1663 void __user *arg) 1664 { 1665 struct snd_seq_queue_status status; 1666 struct snd_seq_queue *queue; 1667 struct snd_seq_timer *tmr; 1668 1669 if (copy_from_user(&status, arg, sizeof(status))) 1670 return -EFAULT; 1671 1672 queue = queueptr(status.queue); 1673 if (queue == NULL) 1674 return -EINVAL; 1675 memset(&status, 0, sizeof(status)); 1676 status.queue = queue->queue; 1677 1678 tmr = queue->timer; 1679 status.events = queue->tickq->cells + queue->timeq->cells; 1680 1681 status.time = snd_seq_timer_get_cur_time(tmr); 1682 status.tick = snd_seq_timer_get_cur_tick(tmr); 1683 1684 status.running = tmr->running; 1685 1686 status.flags = queue->flags; 1687 queuefree(queue); 1688 1689 if (copy_to_user(arg, &status, sizeof(status))) 1690 return -EFAULT; 1691 return 0; 1692 } 1693 1694 1695 /* GET_QUEUE_TEMPO ioctl() */ 1696 static int snd_seq_ioctl_get_queue_tempo(struct snd_seq_client *client, 1697 void __user *arg) 1698 { 1699 struct snd_seq_queue_tempo tempo; 1700 struct snd_seq_queue *queue; 1701 struct snd_seq_timer *tmr; 1702 1703 if (copy_from_user(&tempo, arg, sizeof(tempo))) 1704 return -EFAULT; 1705 1706 queue = queueptr(tempo.queue); 1707 if (queue == NULL) 1708 return -EINVAL; 1709 memset(&tempo, 0, sizeof(tempo)); 1710 tempo.queue = queue->queue; 1711 1712 tmr = queue->timer; 1713 1714 tempo.tempo = tmr->tempo; 1715 tempo.ppq = tmr->ppq; 1716 tempo.skew_value = tmr->skew; 1717 tempo.skew_base = tmr->skew_base; 1718 queuefree(queue); 1719 1720 if (copy_to_user(arg, &tempo, sizeof(tempo))) 1721 return -EFAULT; 1722 return 0; 1723 } 1724 1725 1726 /* SET_QUEUE_TEMPO ioctl() */ 1727 int snd_seq_set_queue_tempo(int client, struct snd_seq_queue_tempo *tempo) 1728 { 1729 if (!snd_seq_queue_check_access(tempo->queue, client)) 1730 return -EPERM; 1731 return snd_seq_queue_timer_set_tempo(tempo->queue, client, tempo); 1732 } 1733 1734 EXPORT_SYMBOL(snd_seq_set_queue_tempo); 1735 1736 static int snd_seq_ioctl_set_queue_tempo(struct snd_seq_client *client, 1737 void __user *arg) 1738 { 1739 int result; 1740 struct snd_seq_queue_tempo tempo; 1741 1742 if (copy_from_user(&tempo, arg, sizeof(tempo))) 1743 return -EFAULT; 1744 1745 result = snd_seq_set_queue_tempo(client->number, &tempo); 1746 return result < 0 ? result : 0; 1747 } 1748 1749 1750 /* GET_QUEUE_TIMER ioctl() */ 1751 static int snd_seq_ioctl_get_queue_timer(struct snd_seq_client *client, 1752 void __user *arg) 1753 { 1754 struct snd_seq_queue_timer timer; 1755 struct snd_seq_queue *queue; 1756 struct snd_seq_timer *tmr; 1757 1758 if (copy_from_user(&timer, arg, sizeof(timer))) 1759 return -EFAULT; 1760 1761 queue = queueptr(timer.queue); 1762 if (queue == NULL) 1763 return -EINVAL; 1764 1765 if (mutex_lock_interruptible(&queue->timer_mutex)) { 1766 queuefree(queue); 1767 return -ERESTARTSYS; 1768 } 1769 tmr = queue->timer; 1770 memset(&timer, 0, sizeof(timer)); 1771 timer.queue = queue->queue; 1772 1773 timer.type = tmr->type; 1774 if (tmr->type == SNDRV_SEQ_TIMER_ALSA) { 1775 timer.u.alsa.id = tmr->alsa_id; 1776 timer.u.alsa.resolution = tmr->preferred_resolution; 1777 } 1778 mutex_unlock(&queue->timer_mutex); 1779 queuefree(queue); 1780 1781 if (copy_to_user(arg, &timer, sizeof(timer))) 1782 return -EFAULT; 1783 return 0; 1784 } 1785 1786 1787 /* SET_QUEUE_TIMER ioctl() */ 1788 static int snd_seq_ioctl_set_queue_timer(struct snd_seq_client *client, 1789 void __user *arg) 1790 { 1791 int result = 0; 1792 struct snd_seq_queue_timer timer; 1793 1794 if (copy_from_user(&timer, arg, sizeof(timer))) 1795 return -EFAULT; 1796 1797 if (timer.type != SNDRV_SEQ_TIMER_ALSA) 1798 return -EINVAL; 1799 1800 if (snd_seq_queue_check_access(timer.queue, client->number)) { 1801 struct snd_seq_queue *q; 1802 struct snd_seq_timer *tmr; 1803 1804 q = queueptr(timer.queue); 1805 if (q == NULL) 1806 return -ENXIO; 1807 if (mutex_lock_interruptible(&q->timer_mutex)) { 1808 queuefree(q); 1809 return -ERESTARTSYS; 1810 } 1811 tmr = q->timer; 1812 snd_seq_queue_timer_close(timer.queue); 1813 tmr->type = timer.type; 1814 if (tmr->type == SNDRV_SEQ_TIMER_ALSA) { 1815 tmr->alsa_id = timer.u.alsa.id; 1816 tmr->preferred_resolution = timer.u.alsa.resolution; 1817 } 1818 result = snd_seq_queue_timer_open(timer.queue); 1819 mutex_unlock(&q->timer_mutex); 1820 queuefree(q); 1821 } else { 1822 return -EPERM; 1823 } 1824 1825 return result; 1826 } 1827 1828 1829 /* GET_QUEUE_CLIENT ioctl() */ 1830 static int snd_seq_ioctl_get_queue_client(struct snd_seq_client *client, 1831 void __user *arg) 1832 { 1833 struct snd_seq_queue_client info; 1834 int used; 1835 1836 if (copy_from_user(&info, arg, sizeof(info))) 1837 return -EFAULT; 1838 1839 used = snd_seq_queue_is_used(info.queue, client->number); 1840 if (used < 0) 1841 return -EINVAL; 1842 info.used = used; 1843 info.client = client->number; 1844 1845 if (copy_to_user(arg, &info, sizeof(info))) 1846 return -EFAULT; 1847 return 0; 1848 } 1849 1850 1851 /* SET_QUEUE_CLIENT ioctl() */ 1852 static int snd_seq_ioctl_set_queue_client(struct snd_seq_client *client, 1853 void __user *arg) 1854 { 1855 int err; 1856 struct snd_seq_queue_client info; 1857 1858 if (copy_from_user(&info, arg, sizeof(info))) 1859 return -EFAULT; 1860 1861 if (info.used >= 0) { 1862 err = snd_seq_queue_use(info.queue, client->number, info.used); 1863 if (err < 0) 1864 return err; 1865 } 1866 1867 return snd_seq_ioctl_get_queue_client(client, arg); 1868 } 1869 1870 1871 /* GET_CLIENT_POOL ioctl() */ 1872 static int snd_seq_ioctl_get_client_pool(struct snd_seq_client *client, 1873 void __user *arg) 1874 { 1875 struct snd_seq_client_pool info; 1876 struct snd_seq_client *cptr; 1877 1878 if (copy_from_user(&info, arg, sizeof(info))) 1879 return -EFAULT; 1880 1881 cptr = snd_seq_client_use_ptr(info.client); 1882 if (cptr == NULL) 1883 return -ENOENT; 1884 memset(&info, 0, sizeof(info)); 1885 info.client = cptr->number; 1886 info.output_pool = cptr->pool->size; 1887 info.output_room = cptr->pool->room; 1888 info.output_free = info.output_pool; 1889 info.output_free = snd_seq_unused_cells(cptr->pool); 1890 if (cptr->type == USER_CLIENT) { 1891 info.input_pool = cptr->data.user.fifo_pool_size; 1892 info.input_free = info.input_pool; 1893 if (cptr->data.user.fifo) 1894 info.input_free = snd_seq_unused_cells(cptr->data.user.fifo->pool); 1895 } else { 1896 info.input_pool = 0; 1897 info.input_free = 0; 1898 } 1899 snd_seq_client_unlock(cptr); 1900 1901 if (copy_to_user(arg, &info, sizeof(info))) 1902 return -EFAULT; 1903 return 0; 1904 } 1905 1906 /* SET_CLIENT_POOL ioctl() */ 1907 static int snd_seq_ioctl_set_client_pool(struct snd_seq_client *client, 1908 void __user *arg) 1909 { 1910 struct snd_seq_client_pool info; 1911 int rc; 1912 1913 if (copy_from_user(&info, arg, sizeof(info))) 1914 return -EFAULT; 1915 1916 if (client->number != info.client) 1917 return -EINVAL; /* can't change other clients */ 1918 1919 if (info.output_pool >= 1 && info.output_pool <= SNDRV_SEQ_MAX_EVENTS && 1920 (! snd_seq_write_pool_allocated(client) || 1921 info.output_pool != client->pool->size)) { 1922 if (snd_seq_write_pool_allocated(client)) { 1923 /* remove all existing cells */ 1924 snd_seq_queue_client_leave_cells(client->number); 1925 snd_seq_pool_done(client->pool); 1926 } 1927 client->pool->size = info.output_pool; 1928 rc = snd_seq_pool_init(client->pool); 1929 if (rc < 0) 1930 return rc; 1931 } 1932 if (client->type == USER_CLIENT && client->data.user.fifo != NULL && 1933 info.input_pool >= 1 && 1934 info.input_pool <= SNDRV_SEQ_MAX_CLIENT_EVENTS && 1935 info.input_pool != client->data.user.fifo_pool_size) { 1936 /* change pool size */ 1937 rc = snd_seq_fifo_resize(client->data.user.fifo, info.input_pool); 1938 if (rc < 0) 1939 return rc; 1940 client->data.user.fifo_pool_size = info.input_pool; 1941 } 1942 if (info.output_room >= 1 && 1943 info.output_room <= client->pool->size) { 1944 client->pool->room = info.output_room; 1945 } 1946 1947 return snd_seq_ioctl_get_client_pool(client, arg); 1948 } 1949 1950 1951 /* REMOVE_EVENTS ioctl() */ 1952 static int snd_seq_ioctl_remove_events(struct snd_seq_client *client, 1953 void __user *arg) 1954 { 1955 struct snd_seq_remove_events info; 1956 1957 if (copy_from_user(&info, arg, sizeof(info))) 1958 return -EFAULT; 1959 1960 /* 1961 * Input mostly not implemented XXX. 1962 */ 1963 if (info.remove_mode & SNDRV_SEQ_REMOVE_INPUT) { 1964 /* 1965 * No restrictions so for a user client we can clear 1966 * the whole fifo 1967 */ 1968 if (client->type == USER_CLIENT && client->data.user.fifo) 1969 snd_seq_fifo_clear(client->data.user.fifo); 1970 } 1971 1972 if (info.remove_mode & SNDRV_SEQ_REMOVE_OUTPUT) 1973 snd_seq_queue_remove_cells(client->number, &info); 1974 1975 return 0; 1976 } 1977 1978 1979 /* 1980 * get subscription info 1981 */ 1982 static int snd_seq_ioctl_get_subscription(struct snd_seq_client *client, 1983 void __user *arg) 1984 { 1985 int result; 1986 struct snd_seq_client *sender = NULL; 1987 struct snd_seq_client_port *sport = NULL; 1988 struct snd_seq_port_subscribe subs; 1989 struct snd_seq_subscribers *p; 1990 1991 if (copy_from_user(&subs, arg, sizeof(subs))) 1992 return -EFAULT; 1993 1994 result = -EINVAL; 1995 if ((sender = snd_seq_client_use_ptr(subs.sender.client)) == NULL) 1996 goto __end; 1997 if ((sport = snd_seq_port_use_ptr(sender, subs.sender.port)) == NULL) 1998 goto __end; 1999 p = snd_seq_port_get_subscription(&sport->c_src, &subs.dest); 2000 if (p) { 2001 result = 0; 2002 subs = p->info; 2003 } else 2004 result = -ENOENT; 2005 2006 __end: 2007 if (sport) 2008 snd_seq_port_unlock(sport); 2009 if (sender) 2010 snd_seq_client_unlock(sender); 2011 if (result >= 0) { 2012 if (copy_to_user(arg, &subs, sizeof(subs))) 2013 return -EFAULT; 2014 } 2015 return result; 2016 } 2017 2018 2019 /* 2020 * get subscription info - check only its presence 2021 */ 2022 static int snd_seq_ioctl_query_subs(struct snd_seq_client *client, 2023 void __user *arg) 2024 { 2025 int result = -ENXIO; 2026 struct snd_seq_client *cptr = NULL; 2027 struct snd_seq_client_port *port = NULL; 2028 struct snd_seq_query_subs subs; 2029 struct snd_seq_port_subs_info *group; 2030 struct list_head *p; 2031 int i; 2032 2033 if (copy_from_user(&subs, arg, sizeof(subs))) 2034 return -EFAULT; 2035 2036 if ((cptr = snd_seq_client_use_ptr(subs.root.client)) == NULL) 2037 goto __end; 2038 if ((port = snd_seq_port_use_ptr(cptr, subs.root.port)) == NULL) 2039 goto __end; 2040 2041 switch (subs.type) { 2042 case SNDRV_SEQ_QUERY_SUBS_READ: 2043 group = &port->c_src; 2044 break; 2045 case SNDRV_SEQ_QUERY_SUBS_WRITE: 2046 group = &port->c_dest; 2047 break; 2048 default: 2049 goto __end; 2050 } 2051 2052 down_read(&group->list_mutex); 2053 /* search for the subscriber */ 2054 subs.num_subs = group->count; 2055 i = 0; 2056 result = -ENOENT; 2057 list_for_each(p, &group->list_head) { 2058 if (i++ == subs.index) { 2059 /* found! */ 2060 struct snd_seq_subscribers *s; 2061 if (subs.type == SNDRV_SEQ_QUERY_SUBS_READ) { 2062 s = list_entry(p, struct snd_seq_subscribers, src_list); 2063 subs.addr = s->info.dest; 2064 } else { 2065 s = list_entry(p, struct snd_seq_subscribers, dest_list); 2066 subs.addr = s->info.sender; 2067 } 2068 subs.flags = s->info.flags; 2069 subs.queue = s->info.queue; 2070 result = 0; 2071 break; 2072 } 2073 } 2074 up_read(&group->list_mutex); 2075 2076 __end: 2077 if (port) 2078 snd_seq_port_unlock(port); 2079 if (cptr) 2080 snd_seq_client_unlock(cptr); 2081 if (result >= 0) { 2082 if (copy_to_user(arg, &subs, sizeof(subs))) 2083 return -EFAULT; 2084 } 2085 return result; 2086 } 2087 2088 2089 /* 2090 * query next client 2091 */ 2092 static int snd_seq_ioctl_query_next_client(struct snd_seq_client *client, 2093 void __user *arg) 2094 { 2095 struct snd_seq_client *cptr = NULL; 2096 struct snd_seq_client_info info; 2097 2098 if (copy_from_user(&info, arg, sizeof(info))) 2099 return -EFAULT; 2100 2101 /* search for next client */ 2102 info.client++; 2103 if (info.client < 0) 2104 info.client = 0; 2105 for (; info.client < SNDRV_SEQ_MAX_CLIENTS; info.client++) { 2106 cptr = snd_seq_client_use_ptr(info.client); 2107 if (cptr) 2108 break; /* found */ 2109 } 2110 if (cptr == NULL) 2111 return -ENOENT; 2112 2113 get_client_info(cptr, &info); 2114 snd_seq_client_unlock(cptr); 2115 2116 if (copy_to_user(arg, &info, sizeof(info))) 2117 return -EFAULT; 2118 return 0; 2119 } 2120 2121 /* 2122 * query next port 2123 */ 2124 static int snd_seq_ioctl_query_next_port(struct snd_seq_client *client, 2125 void __user *arg) 2126 { 2127 struct snd_seq_client *cptr; 2128 struct snd_seq_client_port *port = NULL; 2129 struct snd_seq_port_info info; 2130 2131 if (copy_from_user(&info, arg, sizeof(info))) 2132 return -EFAULT; 2133 cptr = snd_seq_client_use_ptr(info.addr.client); 2134 if (cptr == NULL) 2135 return -ENXIO; 2136 2137 /* search for next port */ 2138 info.addr.port++; 2139 port = snd_seq_port_query_nearest(cptr, &info); 2140 if (port == NULL) { 2141 snd_seq_client_unlock(cptr); 2142 return -ENOENT; 2143 } 2144 2145 /* get port info */ 2146 info.addr = port->addr; 2147 snd_seq_get_port_info(port, &info); 2148 snd_seq_port_unlock(port); 2149 snd_seq_client_unlock(cptr); 2150 2151 if (copy_to_user(arg, &info, sizeof(info))) 2152 return -EFAULT; 2153 return 0; 2154 } 2155 2156 /* -------------------------------------------------------- */ 2157 2158 static struct seq_ioctl_table { 2159 unsigned int cmd; 2160 int (*func)(struct snd_seq_client *client, void __user * arg); 2161 } ioctl_tables[] = { 2162 { SNDRV_SEQ_IOCTL_SYSTEM_INFO, snd_seq_ioctl_system_info }, 2163 { SNDRV_SEQ_IOCTL_RUNNING_MODE, snd_seq_ioctl_running_mode }, 2164 { SNDRV_SEQ_IOCTL_GET_CLIENT_INFO, snd_seq_ioctl_get_client_info }, 2165 { SNDRV_SEQ_IOCTL_SET_CLIENT_INFO, snd_seq_ioctl_set_client_info }, 2166 { SNDRV_SEQ_IOCTL_CREATE_PORT, snd_seq_ioctl_create_port }, 2167 { SNDRV_SEQ_IOCTL_DELETE_PORT, snd_seq_ioctl_delete_port }, 2168 { SNDRV_SEQ_IOCTL_GET_PORT_INFO, snd_seq_ioctl_get_port_info }, 2169 { SNDRV_SEQ_IOCTL_SET_PORT_INFO, snd_seq_ioctl_set_port_info }, 2170 { SNDRV_SEQ_IOCTL_SUBSCRIBE_PORT, snd_seq_ioctl_subscribe_port }, 2171 { SNDRV_SEQ_IOCTL_UNSUBSCRIBE_PORT, snd_seq_ioctl_unsubscribe_port }, 2172 { SNDRV_SEQ_IOCTL_CREATE_QUEUE, snd_seq_ioctl_create_queue }, 2173 { SNDRV_SEQ_IOCTL_DELETE_QUEUE, snd_seq_ioctl_delete_queue }, 2174 { SNDRV_SEQ_IOCTL_GET_QUEUE_INFO, snd_seq_ioctl_get_queue_info }, 2175 { SNDRV_SEQ_IOCTL_SET_QUEUE_INFO, snd_seq_ioctl_set_queue_info }, 2176 { SNDRV_SEQ_IOCTL_GET_NAMED_QUEUE, snd_seq_ioctl_get_named_queue }, 2177 { SNDRV_SEQ_IOCTL_GET_QUEUE_STATUS, snd_seq_ioctl_get_queue_status }, 2178 { SNDRV_SEQ_IOCTL_GET_QUEUE_TEMPO, snd_seq_ioctl_get_queue_tempo }, 2179 { SNDRV_SEQ_IOCTL_SET_QUEUE_TEMPO, snd_seq_ioctl_set_queue_tempo }, 2180 { SNDRV_SEQ_IOCTL_GET_QUEUE_TIMER, snd_seq_ioctl_get_queue_timer }, 2181 { SNDRV_SEQ_IOCTL_SET_QUEUE_TIMER, snd_seq_ioctl_set_queue_timer }, 2182 { SNDRV_SEQ_IOCTL_GET_QUEUE_CLIENT, snd_seq_ioctl_get_queue_client }, 2183 { SNDRV_SEQ_IOCTL_SET_QUEUE_CLIENT, snd_seq_ioctl_set_queue_client }, 2184 { SNDRV_SEQ_IOCTL_GET_CLIENT_POOL, snd_seq_ioctl_get_client_pool }, 2185 { SNDRV_SEQ_IOCTL_SET_CLIENT_POOL, snd_seq_ioctl_set_client_pool }, 2186 { SNDRV_SEQ_IOCTL_GET_SUBSCRIPTION, snd_seq_ioctl_get_subscription }, 2187 { SNDRV_SEQ_IOCTL_QUERY_NEXT_CLIENT, snd_seq_ioctl_query_next_client }, 2188 { SNDRV_SEQ_IOCTL_QUERY_NEXT_PORT, snd_seq_ioctl_query_next_port }, 2189 { SNDRV_SEQ_IOCTL_REMOVE_EVENTS, snd_seq_ioctl_remove_events }, 2190 { SNDRV_SEQ_IOCTL_QUERY_SUBS, snd_seq_ioctl_query_subs }, 2191 { 0, NULL }, 2192 }; 2193 2194 static int snd_seq_do_ioctl(struct snd_seq_client *client, unsigned int cmd, 2195 void __user *arg) 2196 { 2197 struct seq_ioctl_table *p; 2198 2199 switch (cmd) { 2200 case SNDRV_SEQ_IOCTL_PVERSION: 2201 /* return sequencer version number */ 2202 return put_user(SNDRV_SEQ_VERSION, (int __user *)arg) ? -EFAULT : 0; 2203 case SNDRV_SEQ_IOCTL_CLIENT_ID: 2204 /* return the id of this client */ 2205 return put_user(client->number, (int __user *)arg) ? -EFAULT : 0; 2206 } 2207 2208 if (! arg) 2209 return -EFAULT; 2210 for (p = ioctl_tables; p->cmd; p++) { 2211 if (p->cmd == cmd) 2212 return p->func(client, arg); 2213 } 2214 pr_debug("ALSA: seq unknown ioctl() 0x%x (type='%c', number=0x%02x)\n", 2215 cmd, _IOC_TYPE(cmd), _IOC_NR(cmd)); 2216 return -ENOTTY; 2217 } 2218 2219 2220 static long snd_seq_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 2221 { 2222 struct snd_seq_client *client = file->private_data; 2223 2224 if (snd_BUG_ON(!client)) 2225 return -ENXIO; 2226 2227 return snd_seq_do_ioctl(client, cmd, (void __user *) arg); 2228 } 2229 2230 #ifdef CONFIG_COMPAT 2231 #include "seq_compat.c" 2232 #else 2233 #define snd_seq_ioctl_compat NULL 2234 #endif 2235 2236 /* -------------------------------------------------------- */ 2237 2238 2239 /* exported to kernel modules */ 2240 int snd_seq_create_kernel_client(struct snd_card *card, int client_index, 2241 const char *name_fmt, ...) 2242 { 2243 struct snd_seq_client *client; 2244 va_list args; 2245 2246 if (snd_BUG_ON(in_interrupt())) 2247 return -EBUSY; 2248 2249 if (card && client_index >= SNDRV_SEQ_CLIENTS_PER_CARD) 2250 return -EINVAL; 2251 if (card == NULL && client_index >= SNDRV_SEQ_GLOBAL_CLIENTS) 2252 return -EINVAL; 2253 2254 if (mutex_lock_interruptible(®ister_mutex)) 2255 return -ERESTARTSYS; 2256 2257 if (card) { 2258 client_index += SNDRV_SEQ_GLOBAL_CLIENTS 2259 + card->number * SNDRV_SEQ_CLIENTS_PER_CARD; 2260 if (client_index >= SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN) 2261 client_index = -1; 2262 } 2263 2264 /* empty write queue as default */ 2265 client = seq_create_client1(client_index, 0); 2266 if (client == NULL) { 2267 mutex_unlock(®ister_mutex); 2268 return -EBUSY; /* failure code */ 2269 } 2270 usage_alloc(&client_usage, 1); 2271 2272 client->accept_input = 1; 2273 client->accept_output = 1; 2274 2275 va_start(args, name_fmt); 2276 vsnprintf(client->name, sizeof(client->name), name_fmt, args); 2277 va_end(args); 2278 2279 client->type = KERNEL_CLIENT; 2280 mutex_unlock(®ister_mutex); 2281 2282 /* make others aware this new client */ 2283 snd_seq_system_client_ev_client_start(client->number); 2284 2285 /* return client number to caller */ 2286 return client->number; 2287 } 2288 2289 EXPORT_SYMBOL(snd_seq_create_kernel_client); 2290 2291 /* exported to kernel modules */ 2292 int snd_seq_delete_kernel_client(int client) 2293 { 2294 struct snd_seq_client *ptr; 2295 2296 if (snd_BUG_ON(in_interrupt())) 2297 return -EBUSY; 2298 2299 ptr = clientptr(client); 2300 if (ptr == NULL) 2301 return -EINVAL; 2302 2303 seq_free_client(ptr); 2304 kfree(ptr); 2305 return 0; 2306 } 2307 2308 EXPORT_SYMBOL(snd_seq_delete_kernel_client); 2309 2310 /* skeleton to enqueue event, called from snd_seq_kernel_client_enqueue 2311 * and snd_seq_kernel_client_enqueue_blocking 2312 */ 2313 static int kernel_client_enqueue(int client, struct snd_seq_event *ev, 2314 struct file *file, int blocking, 2315 int atomic, int hop) 2316 { 2317 struct snd_seq_client *cptr; 2318 int result; 2319 2320 if (snd_BUG_ON(!ev)) 2321 return -EINVAL; 2322 2323 if (ev->type == SNDRV_SEQ_EVENT_NONE) 2324 return 0; /* ignore this */ 2325 if (ev->type == SNDRV_SEQ_EVENT_KERNEL_ERROR) 2326 return -EINVAL; /* quoted events can't be enqueued */ 2327 2328 /* fill in client number */ 2329 ev->source.client = client; 2330 2331 if (check_event_type_and_length(ev)) 2332 return -EINVAL; 2333 2334 cptr = snd_seq_client_use_ptr(client); 2335 if (cptr == NULL) 2336 return -EINVAL; 2337 2338 if (! cptr->accept_output) 2339 result = -EPERM; 2340 else /* send it */ 2341 result = snd_seq_client_enqueue_event(cptr, ev, file, blocking, atomic, hop); 2342 2343 snd_seq_client_unlock(cptr); 2344 return result; 2345 } 2346 2347 /* 2348 * exported, called by kernel clients to enqueue events (w/o blocking) 2349 * 2350 * RETURN VALUE: zero if succeed, negative if error 2351 */ 2352 int snd_seq_kernel_client_enqueue(int client, struct snd_seq_event * ev, 2353 int atomic, int hop) 2354 { 2355 return kernel_client_enqueue(client, ev, NULL, 0, atomic, hop); 2356 } 2357 2358 EXPORT_SYMBOL(snd_seq_kernel_client_enqueue); 2359 2360 /* 2361 * exported, called by kernel clients to enqueue events (with blocking) 2362 * 2363 * RETURN VALUE: zero if succeed, negative if error 2364 */ 2365 int snd_seq_kernel_client_enqueue_blocking(int client, struct snd_seq_event * ev, 2366 struct file *file, 2367 int atomic, int hop) 2368 { 2369 return kernel_client_enqueue(client, ev, file, 1, atomic, hop); 2370 } 2371 2372 EXPORT_SYMBOL(snd_seq_kernel_client_enqueue_blocking); 2373 2374 /* 2375 * exported, called by kernel clients to dispatch events directly to other 2376 * clients, bypassing the queues. Event time-stamp will be updated. 2377 * 2378 * RETURN VALUE: negative = delivery failed, 2379 * zero, or positive: the number of delivered events 2380 */ 2381 int snd_seq_kernel_client_dispatch(int client, struct snd_seq_event * ev, 2382 int atomic, int hop) 2383 { 2384 struct snd_seq_client *cptr; 2385 int result; 2386 2387 if (snd_BUG_ON(!ev)) 2388 return -EINVAL; 2389 2390 /* fill in client number */ 2391 ev->queue = SNDRV_SEQ_QUEUE_DIRECT; 2392 ev->source.client = client; 2393 2394 if (check_event_type_and_length(ev)) 2395 return -EINVAL; 2396 2397 cptr = snd_seq_client_use_ptr(client); 2398 if (cptr == NULL) 2399 return -EINVAL; 2400 2401 if (!cptr->accept_output) 2402 result = -EPERM; 2403 else 2404 result = snd_seq_deliver_event(cptr, ev, atomic, hop); 2405 2406 snd_seq_client_unlock(cptr); 2407 return result; 2408 } 2409 2410 EXPORT_SYMBOL(snd_seq_kernel_client_dispatch); 2411 2412 /* 2413 * exported, called by kernel clients to perform same functions as with 2414 * userland ioctl() 2415 */ 2416 int snd_seq_kernel_client_ctl(int clientid, unsigned int cmd, void *arg) 2417 { 2418 struct snd_seq_client *client; 2419 mm_segment_t fs; 2420 int result; 2421 2422 client = clientptr(clientid); 2423 if (client == NULL) 2424 return -ENXIO; 2425 fs = snd_enter_user(); 2426 result = snd_seq_do_ioctl(client, cmd, (void __force __user *)arg); 2427 snd_leave_user(fs); 2428 return result; 2429 } 2430 2431 EXPORT_SYMBOL(snd_seq_kernel_client_ctl); 2432 2433 /* exported (for OSS emulator) */ 2434 int snd_seq_kernel_client_write_poll(int clientid, struct file *file, poll_table *wait) 2435 { 2436 struct snd_seq_client *client; 2437 2438 client = clientptr(clientid); 2439 if (client == NULL) 2440 return -ENXIO; 2441 2442 if (! snd_seq_write_pool_allocated(client)) 2443 return 1; 2444 if (snd_seq_pool_poll_wait(client->pool, file, wait)) 2445 return 1; 2446 return 0; 2447 } 2448 2449 EXPORT_SYMBOL(snd_seq_kernel_client_write_poll); 2450 2451 /*---------------------------------------------------------------------------*/ 2452 2453 #ifdef CONFIG_SND_PROC_FS 2454 /* 2455 * /proc interface 2456 */ 2457 static void snd_seq_info_dump_subscribers(struct snd_info_buffer *buffer, 2458 struct snd_seq_port_subs_info *group, 2459 int is_src, char *msg) 2460 { 2461 struct list_head *p; 2462 struct snd_seq_subscribers *s; 2463 int count = 0; 2464 2465 down_read(&group->list_mutex); 2466 if (list_empty(&group->list_head)) { 2467 up_read(&group->list_mutex); 2468 return; 2469 } 2470 snd_iprintf(buffer, msg); 2471 list_for_each(p, &group->list_head) { 2472 if (is_src) 2473 s = list_entry(p, struct snd_seq_subscribers, src_list); 2474 else 2475 s = list_entry(p, struct snd_seq_subscribers, dest_list); 2476 if (count++) 2477 snd_iprintf(buffer, ", "); 2478 snd_iprintf(buffer, "%d:%d", 2479 is_src ? s->info.dest.client : s->info.sender.client, 2480 is_src ? s->info.dest.port : s->info.sender.port); 2481 if (s->info.flags & SNDRV_SEQ_PORT_SUBS_TIMESTAMP) 2482 snd_iprintf(buffer, "[%c:%d]", ((s->info.flags & SNDRV_SEQ_PORT_SUBS_TIME_REAL) ? 'r' : 't'), s->info.queue); 2483 if (group->exclusive) 2484 snd_iprintf(buffer, "[ex]"); 2485 } 2486 up_read(&group->list_mutex); 2487 snd_iprintf(buffer, "\n"); 2488 } 2489 2490 #define FLAG_PERM_RD(perm) ((perm) & SNDRV_SEQ_PORT_CAP_READ ? ((perm) & SNDRV_SEQ_PORT_CAP_SUBS_READ ? 'R' : 'r') : '-') 2491 #define FLAG_PERM_WR(perm) ((perm) & SNDRV_SEQ_PORT_CAP_WRITE ? ((perm) & SNDRV_SEQ_PORT_CAP_SUBS_WRITE ? 'W' : 'w') : '-') 2492 #define FLAG_PERM_EX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_NO_EXPORT ? '-' : 'e') 2493 2494 #define FLAG_PERM_DUPLEX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_DUPLEX ? 'X' : '-') 2495 2496 static void snd_seq_info_dump_ports(struct snd_info_buffer *buffer, 2497 struct snd_seq_client *client) 2498 { 2499 struct snd_seq_client_port *p; 2500 2501 mutex_lock(&client->ports_mutex); 2502 list_for_each_entry(p, &client->ports_list_head, list) { 2503 snd_iprintf(buffer, " Port %3d : \"%s\" (%c%c%c%c)\n", 2504 p->addr.port, p->name, 2505 FLAG_PERM_RD(p->capability), 2506 FLAG_PERM_WR(p->capability), 2507 FLAG_PERM_EX(p->capability), 2508 FLAG_PERM_DUPLEX(p->capability)); 2509 snd_seq_info_dump_subscribers(buffer, &p->c_src, 1, " Connecting To: "); 2510 snd_seq_info_dump_subscribers(buffer, &p->c_dest, 0, " Connected From: "); 2511 } 2512 mutex_unlock(&client->ports_mutex); 2513 } 2514 2515 2516 /* exported to seq_info.c */ 2517 void snd_seq_info_clients_read(struct snd_info_entry *entry, 2518 struct snd_info_buffer *buffer) 2519 { 2520 int c; 2521 struct snd_seq_client *client; 2522 2523 snd_iprintf(buffer, "Client info\n"); 2524 snd_iprintf(buffer, " cur clients : %d\n", client_usage.cur); 2525 snd_iprintf(buffer, " peak clients : %d\n", client_usage.peak); 2526 snd_iprintf(buffer, " max clients : %d\n", SNDRV_SEQ_MAX_CLIENTS); 2527 snd_iprintf(buffer, "\n"); 2528 2529 /* list the client table */ 2530 for (c = 0; c < SNDRV_SEQ_MAX_CLIENTS; c++) { 2531 client = snd_seq_client_use_ptr(c); 2532 if (client == NULL) 2533 continue; 2534 if (client->type == NO_CLIENT) { 2535 snd_seq_client_unlock(client); 2536 continue; 2537 } 2538 2539 snd_iprintf(buffer, "Client %3d : \"%s\" [%s]\n", 2540 c, client->name, 2541 client->type == USER_CLIENT ? "User" : "Kernel"); 2542 snd_seq_info_dump_ports(buffer, client); 2543 if (snd_seq_write_pool_allocated(client)) { 2544 snd_iprintf(buffer, " Output pool :\n"); 2545 snd_seq_info_pool(buffer, client->pool, " "); 2546 } 2547 if (client->type == USER_CLIENT && client->data.user.fifo && 2548 client->data.user.fifo->pool) { 2549 snd_iprintf(buffer, " Input pool :\n"); 2550 snd_seq_info_pool(buffer, client->data.user.fifo->pool, " "); 2551 } 2552 snd_seq_client_unlock(client); 2553 } 2554 } 2555 #endif /* CONFIG_SND_PROC_FS */ 2556 2557 /*---------------------------------------------------------------------------*/ 2558 2559 2560 /* 2561 * REGISTRATION PART 2562 */ 2563 2564 static const struct file_operations snd_seq_f_ops = 2565 { 2566 .owner = THIS_MODULE, 2567 .read = snd_seq_read, 2568 .write = snd_seq_write, 2569 .open = snd_seq_open, 2570 .release = snd_seq_release, 2571 .llseek = no_llseek, 2572 .poll = snd_seq_poll, 2573 .unlocked_ioctl = snd_seq_ioctl, 2574 .compat_ioctl = snd_seq_ioctl_compat, 2575 }; 2576 2577 static struct device seq_dev; 2578 2579 /* 2580 * register sequencer device 2581 */ 2582 int __init snd_sequencer_device_init(void) 2583 { 2584 int err; 2585 2586 snd_device_initialize(&seq_dev, NULL); 2587 dev_set_name(&seq_dev, "seq"); 2588 2589 if (mutex_lock_interruptible(®ister_mutex)) 2590 return -ERESTARTSYS; 2591 2592 err = snd_register_device(SNDRV_DEVICE_TYPE_SEQUENCER, NULL, 0, 2593 &snd_seq_f_ops, NULL, &seq_dev); 2594 if (err < 0) { 2595 mutex_unlock(®ister_mutex); 2596 put_device(&seq_dev); 2597 return err; 2598 } 2599 2600 mutex_unlock(®ister_mutex); 2601 2602 return 0; 2603 } 2604 2605 2606 2607 /* 2608 * unregister sequencer device 2609 */ 2610 void __exit snd_sequencer_device_done(void) 2611 { 2612 snd_unregister_device(&seq_dev); 2613 put_device(&seq_dev); 2614 } 2615