1 /* 2 * ALSA sequencer Client Manager 3 * Copyright (c) 1998-2001 by Frank van de Pol <fvdpol@coil.demon.nl> 4 * Jaroslav Kysela <perex@suse.cz> 5 * Takashi Iwai <tiwai@suse.de> 6 * 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License as published by 10 * the Free Software Foundation; either version 2 of the License, or 11 * (at your option) any later version. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 * 18 * You should have received a copy of the GNU General Public License 19 * along with this program; if not, write to the Free Software 20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 21 * 22 */ 23 24 #include <sound/driver.h> 25 #include <linux/init.h> 26 #include <linux/smp_lock.h> 27 #include <linux/slab.h> 28 #include <sound/core.h> 29 #include <sound/minors.h> 30 #include <linux/kmod.h> 31 32 #include <sound/seq_kernel.h> 33 #include "seq_clientmgr.h" 34 #include "seq_memory.h" 35 #include "seq_queue.h" 36 #include "seq_timer.h" 37 #include "seq_info.h" 38 #include "seq_system.h" 39 #include <sound/seq_device.h> 40 #ifdef CONFIG_COMPAT 41 #include <linux/compat.h> 42 #endif 43 44 /* Client Manager 45 46 * this module handles the connections of userland and kernel clients 47 * 48 */ 49 50 /* 51 * There are four ranges of client numbers (last two shared): 52 * 0..15: global clients 53 * 16..127: statically allocated client numbers for cards 0..27 54 * 128..191: dynamically allocated client numbers for cards 28..31 55 * 128..191: dynamically allocated client numbers for applications 56 */ 57 58 /* number of kernel non-card clients */ 59 #define SNDRV_SEQ_GLOBAL_CLIENTS 16 60 /* clients per cards, for static clients */ 61 #define SNDRV_SEQ_CLIENTS_PER_CARD 4 62 /* dynamically allocated client numbers (both kernel drivers and user space) */ 63 #define SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN 128 64 65 #define SNDRV_SEQ_LFLG_INPUT 0x0001 66 #define SNDRV_SEQ_LFLG_OUTPUT 0x0002 67 #define SNDRV_SEQ_LFLG_OPEN (SNDRV_SEQ_LFLG_INPUT|SNDRV_SEQ_LFLG_OUTPUT) 68 69 static DEFINE_SPINLOCK(clients_lock); 70 static DEFINE_MUTEX(register_mutex); 71 72 /* 73 * client table 74 */ 75 static char clienttablock[SNDRV_SEQ_MAX_CLIENTS]; 76 static struct snd_seq_client *clienttab[SNDRV_SEQ_MAX_CLIENTS]; 77 static struct snd_seq_usage client_usage; 78 79 /* 80 * prototypes 81 */ 82 static int bounce_error_event(struct snd_seq_client *client, 83 struct snd_seq_event *event, 84 int err, int atomic, int hop); 85 static int snd_seq_deliver_single_event(struct snd_seq_client *client, 86 struct snd_seq_event *event, 87 int filter, int atomic, int hop); 88 89 /* 90 */ 91 92 static inline mm_segment_t snd_enter_user(void) 93 { 94 mm_segment_t fs = get_fs(); 95 set_fs(get_ds()); 96 return fs; 97 } 98 99 static inline void snd_leave_user(mm_segment_t fs) 100 { 101 set_fs(fs); 102 } 103 104 /* 105 */ 106 static inline unsigned short snd_seq_file_flags(struct file *file) 107 { 108 switch (file->f_mode & (FMODE_READ | FMODE_WRITE)) { 109 case FMODE_WRITE: 110 return SNDRV_SEQ_LFLG_OUTPUT; 111 case FMODE_READ: 112 return SNDRV_SEQ_LFLG_INPUT; 113 default: 114 return SNDRV_SEQ_LFLG_OPEN; 115 } 116 } 117 118 static inline int snd_seq_write_pool_allocated(struct snd_seq_client *client) 119 { 120 return snd_seq_total_cells(client->pool) > 0; 121 } 122 123 /* return pointer to client structure for specified id */ 124 static struct snd_seq_client *clientptr(int clientid) 125 { 126 if (clientid < 0 || clientid >= SNDRV_SEQ_MAX_CLIENTS) { 127 snd_printd("Seq: oops. Trying to get pointer to client %d\n", 128 clientid); 129 return NULL; 130 } 131 return clienttab[clientid]; 132 } 133 134 extern int seq_client_load[]; 135 136 struct snd_seq_client *snd_seq_client_use_ptr(int clientid) 137 { 138 unsigned long flags; 139 struct snd_seq_client *client; 140 141 if (clientid < 0 || clientid >= SNDRV_SEQ_MAX_CLIENTS) { 142 snd_printd("Seq: oops. Trying to get pointer to client %d\n", 143 clientid); 144 return NULL; 145 } 146 spin_lock_irqsave(&clients_lock, flags); 147 client = clientptr(clientid); 148 if (client) 149 goto __lock; 150 if (clienttablock[clientid]) { 151 spin_unlock_irqrestore(&clients_lock, flags); 152 return NULL; 153 } 154 spin_unlock_irqrestore(&clients_lock, flags); 155 #ifdef CONFIG_KMOD 156 if (!in_interrupt() && current->fs->root) { 157 static char client_requested[SNDRV_SEQ_GLOBAL_CLIENTS]; 158 static char card_requested[SNDRV_CARDS]; 159 if (clientid < SNDRV_SEQ_GLOBAL_CLIENTS) { 160 int idx; 161 162 if (! client_requested[clientid] && current->fs->root) { 163 client_requested[clientid] = 1; 164 for (idx = 0; idx < 15; idx++) { 165 if (seq_client_load[idx] < 0) 166 break; 167 if (seq_client_load[idx] == clientid) { 168 request_module("snd-seq-client-%i", 169 clientid); 170 break; 171 } 172 } 173 } 174 } else if (clientid < SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN) { 175 int card = (clientid - SNDRV_SEQ_GLOBAL_CLIENTS) / 176 SNDRV_SEQ_CLIENTS_PER_CARD; 177 if (card < snd_ecards_limit) { 178 if (! card_requested[card]) { 179 card_requested[card] = 1; 180 snd_request_card(card); 181 } 182 snd_seq_device_load_drivers(); 183 } 184 } 185 spin_lock_irqsave(&clients_lock, flags); 186 client = clientptr(clientid); 187 if (client) 188 goto __lock; 189 spin_unlock_irqrestore(&clients_lock, flags); 190 } 191 #endif 192 return NULL; 193 194 __lock: 195 snd_use_lock_use(&client->use_lock); 196 spin_unlock_irqrestore(&clients_lock, flags); 197 return client; 198 } 199 200 static void usage_alloc(struct snd_seq_usage *res, int num) 201 { 202 res->cur += num; 203 if (res->cur > res->peak) 204 res->peak = res->cur; 205 } 206 207 static void usage_free(struct snd_seq_usage *res, int num) 208 { 209 res->cur -= num; 210 } 211 212 /* initialise data structures */ 213 int __init client_init_data(void) 214 { 215 /* zap out the client table */ 216 memset(&clienttablock, 0, sizeof(clienttablock)); 217 memset(&clienttab, 0, sizeof(clienttab)); 218 return 0; 219 } 220 221 222 static struct snd_seq_client *seq_create_client1(int client_index, int poolsize) 223 { 224 unsigned long flags; 225 int c; 226 struct snd_seq_client *client; 227 228 /* init client data */ 229 client = kzalloc(sizeof(*client), GFP_KERNEL); 230 if (client == NULL) 231 return NULL; 232 client->pool = snd_seq_pool_new(poolsize); 233 if (client->pool == NULL) { 234 kfree(client); 235 return NULL; 236 } 237 client->type = NO_CLIENT; 238 snd_use_lock_init(&client->use_lock); 239 rwlock_init(&client->ports_lock); 240 mutex_init(&client->ports_mutex); 241 INIT_LIST_HEAD(&client->ports_list_head); 242 243 /* find free slot in the client table */ 244 spin_lock_irqsave(&clients_lock, flags); 245 if (client_index < 0) { 246 for (c = SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN; 247 c < SNDRV_SEQ_MAX_CLIENTS; 248 c++) { 249 if (clienttab[c] || clienttablock[c]) 250 continue; 251 clienttab[client->number = c] = client; 252 spin_unlock_irqrestore(&clients_lock, flags); 253 return client; 254 } 255 } else { 256 if (clienttab[client_index] == NULL && !clienttablock[client_index]) { 257 clienttab[client->number = client_index] = client; 258 spin_unlock_irqrestore(&clients_lock, flags); 259 return client; 260 } 261 } 262 spin_unlock_irqrestore(&clients_lock, flags); 263 snd_seq_pool_delete(&client->pool); 264 kfree(client); 265 return NULL; /* no free slot found or busy, return failure code */ 266 } 267 268 269 static int seq_free_client1(struct snd_seq_client *client) 270 { 271 unsigned long flags; 272 273 snd_assert(client != NULL, return -EINVAL); 274 snd_seq_delete_all_ports(client); 275 snd_seq_queue_client_leave(client->number); 276 spin_lock_irqsave(&clients_lock, flags); 277 clienttablock[client->number] = 1; 278 clienttab[client->number] = NULL; 279 spin_unlock_irqrestore(&clients_lock, flags); 280 snd_use_lock_sync(&client->use_lock); 281 snd_seq_queue_client_termination(client->number); 282 if (client->pool) 283 snd_seq_pool_delete(&client->pool); 284 spin_lock_irqsave(&clients_lock, flags); 285 clienttablock[client->number] = 0; 286 spin_unlock_irqrestore(&clients_lock, flags); 287 return 0; 288 } 289 290 291 static void seq_free_client(struct snd_seq_client * client) 292 { 293 mutex_lock(®ister_mutex); 294 switch (client->type) { 295 case NO_CLIENT: 296 snd_printk(KERN_WARNING "Seq: Trying to free unused client %d\n", 297 client->number); 298 break; 299 case USER_CLIENT: 300 case KERNEL_CLIENT: 301 seq_free_client1(client); 302 usage_free(&client_usage, 1); 303 break; 304 305 default: 306 snd_printk(KERN_ERR "Seq: Trying to free client %d with undefined type = %d\n", 307 client->number, client->type); 308 } 309 mutex_unlock(®ister_mutex); 310 311 snd_seq_system_client_ev_client_exit(client->number); 312 } 313 314 315 316 /* -------------------------------------------------------- */ 317 318 /* create a user client */ 319 static int snd_seq_open(struct inode *inode, struct file *file) 320 { 321 int c, mode; /* client id */ 322 struct snd_seq_client *client; 323 struct snd_seq_user_client *user; 324 325 if (mutex_lock_interruptible(®ister_mutex)) 326 return -ERESTARTSYS; 327 client = seq_create_client1(-1, SNDRV_SEQ_DEFAULT_EVENTS); 328 if (client == NULL) { 329 mutex_unlock(®ister_mutex); 330 return -ENOMEM; /* failure code */ 331 } 332 333 mode = snd_seq_file_flags(file); 334 if (mode & SNDRV_SEQ_LFLG_INPUT) 335 client->accept_input = 1; 336 if (mode & SNDRV_SEQ_LFLG_OUTPUT) 337 client->accept_output = 1; 338 339 user = &client->data.user; 340 user->fifo = NULL; 341 user->fifo_pool_size = 0; 342 343 if (mode & SNDRV_SEQ_LFLG_INPUT) { 344 user->fifo_pool_size = SNDRV_SEQ_DEFAULT_CLIENT_EVENTS; 345 user->fifo = snd_seq_fifo_new(user->fifo_pool_size); 346 if (user->fifo == NULL) { 347 seq_free_client1(client); 348 kfree(client); 349 mutex_unlock(®ister_mutex); 350 return -ENOMEM; 351 } 352 } 353 354 usage_alloc(&client_usage, 1); 355 client->type = USER_CLIENT; 356 mutex_unlock(®ister_mutex); 357 358 c = client->number; 359 file->private_data = client; 360 361 /* fill client data */ 362 user->file = file; 363 sprintf(client->name, "Client-%d", c); 364 365 /* make others aware this new client */ 366 snd_seq_system_client_ev_client_start(c); 367 368 return 0; 369 } 370 371 /* delete a user client */ 372 static int snd_seq_release(struct inode *inode, struct file *file) 373 { 374 struct snd_seq_client *client = file->private_data; 375 376 if (client) { 377 seq_free_client(client); 378 if (client->data.user.fifo) 379 snd_seq_fifo_delete(&client->data.user.fifo); 380 kfree(client); 381 } 382 383 return 0; 384 } 385 386 387 /* handle client read() */ 388 /* possible error values: 389 * -ENXIO invalid client or file open mode 390 * -ENOSPC FIFO overflow (the flag is cleared after this error report) 391 * -EINVAL no enough user-space buffer to write the whole event 392 * -EFAULT seg. fault during copy to user space 393 */ 394 static ssize_t snd_seq_read(struct file *file, char __user *buf, size_t count, 395 loff_t *offset) 396 { 397 struct snd_seq_client *client = file->private_data; 398 struct snd_seq_fifo *fifo; 399 int err; 400 long result = 0; 401 struct snd_seq_event_cell *cell; 402 403 if (!(snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_INPUT)) 404 return -ENXIO; 405 406 if (!access_ok(VERIFY_WRITE, buf, count)) 407 return -EFAULT; 408 409 /* check client structures are in place */ 410 snd_assert(client != NULL, return -ENXIO); 411 412 if (!client->accept_input || (fifo = client->data.user.fifo) == NULL) 413 return -ENXIO; 414 415 if (atomic_read(&fifo->overflow) > 0) { 416 /* buffer overflow is detected */ 417 snd_seq_fifo_clear(fifo); 418 /* return error code */ 419 return -ENOSPC; 420 } 421 422 cell = NULL; 423 err = 0; 424 snd_seq_fifo_lock(fifo); 425 426 /* while data available in queue */ 427 while (count >= sizeof(struct snd_seq_event)) { 428 int nonblock; 429 430 nonblock = (file->f_flags & O_NONBLOCK) || result > 0; 431 if ((err = snd_seq_fifo_cell_out(fifo, &cell, nonblock)) < 0) { 432 break; 433 } 434 if (snd_seq_ev_is_variable(&cell->event)) { 435 struct snd_seq_event tmpev; 436 tmpev = cell->event; 437 tmpev.data.ext.len &= ~SNDRV_SEQ_EXT_MASK; 438 if (copy_to_user(buf, &tmpev, sizeof(struct snd_seq_event))) { 439 err = -EFAULT; 440 break; 441 } 442 count -= sizeof(struct snd_seq_event); 443 buf += sizeof(struct snd_seq_event); 444 err = snd_seq_expand_var_event(&cell->event, count, 445 (char __force *)buf, 0, 446 sizeof(struct snd_seq_event)); 447 if (err < 0) 448 break; 449 result += err; 450 count -= err; 451 buf += err; 452 } else { 453 if (copy_to_user(buf, &cell->event, sizeof(struct snd_seq_event))) { 454 err = -EFAULT; 455 break; 456 } 457 count -= sizeof(struct snd_seq_event); 458 buf += sizeof(struct snd_seq_event); 459 } 460 snd_seq_cell_free(cell); 461 cell = NULL; /* to be sure */ 462 result += sizeof(struct snd_seq_event); 463 } 464 465 if (err < 0) { 466 if (cell) 467 snd_seq_fifo_cell_putback(fifo, cell); 468 if (err == -EAGAIN && result > 0) 469 err = 0; 470 } 471 snd_seq_fifo_unlock(fifo); 472 473 return (err < 0) ? err : result; 474 } 475 476 477 /* 478 * check access permission to the port 479 */ 480 static int check_port_perm(struct snd_seq_client_port *port, unsigned int flags) 481 { 482 if ((port->capability & flags) != flags) 483 return 0; 484 return flags; 485 } 486 487 /* 488 * check if the destination client is available, and return the pointer 489 * if filter is non-zero, client filter bitmap is tested. 490 */ 491 static struct snd_seq_client *get_event_dest_client(struct snd_seq_event *event, 492 int filter) 493 { 494 struct snd_seq_client *dest; 495 496 dest = snd_seq_client_use_ptr(event->dest.client); 497 if (dest == NULL) 498 return NULL; 499 if (! dest->accept_input) 500 goto __not_avail; 501 if ((dest->filter & SNDRV_SEQ_FILTER_USE_EVENT) && 502 ! test_bit(event->type, dest->event_filter)) 503 goto __not_avail; 504 if (filter && !(dest->filter & filter)) 505 goto __not_avail; 506 507 return dest; /* ok - accessible */ 508 __not_avail: 509 snd_seq_client_unlock(dest); 510 return NULL; 511 } 512 513 514 /* 515 * Return the error event. 516 * 517 * If the receiver client is a user client, the original event is 518 * encapsulated in SNDRV_SEQ_EVENT_BOUNCE as variable length event. If 519 * the original event is also variable length, the external data is 520 * copied after the event record. 521 * If the receiver client is a kernel client, the original event is 522 * quoted in SNDRV_SEQ_EVENT_KERNEL_ERROR, since this requires no extra 523 * kmalloc. 524 */ 525 static int bounce_error_event(struct snd_seq_client *client, 526 struct snd_seq_event *event, 527 int err, int atomic, int hop) 528 { 529 struct snd_seq_event bounce_ev; 530 int result; 531 532 if (client == NULL || 533 ! (client->filter & SNDRV_SEQ_FILTER_BOUNCE) || 534 ! client->accept_input) 535 return 0; /* ignored */ 536 537 /* set up quoted error */ 538 memset(&bounce_ev, 0, sizeof(bounce_ev)); 539 bounce_ev.type = SNDRV_SEQ_EVENT_KERNEL_ERROR; 540 bounce_ev.flags = SNDRV_SEQ_EVENT_LENGTH_FIXED; 541 bounce_ev.queue = SNDRV_SEQ_QUEUE_DIRECT; 542 bounce_ev.source.client = SNDRV_SEQ_CLIENT_SYSTEM; 543 bounce_ev.source.port = SNDRV_SEQ_PORT_SYSTEM_ANNOUNCE; 544 bounce_ev.dest.client = client->number; 545 bounce_ev.dest.port = event->source.port; 546 bounce_ev.data.quote.origin = event->dest; 547 bounce_ev.data.quote.event = event; 548 bounce_ev.data.quote.value = -err; /* use positive value */ 549 result = snd_seq_deliver_single_event(NULL, &bounce_ev, 0, atomic, hop + 1); 550 if (result < 0) { 551 client->event_lost++; 552 return result; 553 } 554 555 return result; 556 } 557 558 559 /* 560 * rewrite the time-stamp of the event record with the curren time 561 * of the given queue. 562 * return non-zero if updated. 563 */ 564 static int update_timestamp_of_queue(struct snd_seq_event *event, 565 int queue, int real_time) 566 { 567 struct snd_seq_queue *q; 568 569 q = queueptr(queue); 570 if (! q) 571 return 0; 572 event->queue = queue; 573 event->flags &= ~SNDRV_SEQ_TIME_STAMP_MASK; 574 if (real_time) { 575 event->time.time = snd_seq_timer_get_cur_time(q->timer); 576 event->flags |= SNDRV_SEQ_TIME_STAMP_REAL; 577 } else { 578 event->time.tick = snd_seq_timer_get_cur_tick(q->timer); 579 event->flags |= SNDRV_SEQ_TIME_STAMP_TICK; 580 } 581 queuefree(q); 582 return 1; 583 } 584 585 586 /* 587 * deliver an event to the specified destination. 588 * if filter is non-zero, client filter bitmap is tested. 589 * 590 * RETURN VALUE: 0 : if succeeded 591 * <0 : error 592 */ 593 static int snd_seq_deliver_single_event(struct snd_seq_client *client, 594 struct snd_seq_event *event, 595 int filter, int atomic, int hop) 596 { 597 struct snd_seq_client *dest = NULL; 598 struct snd_seq_client_port *dest_port = NULL; 599 int result = -ENOENT; 600 int direct; 601 602 direct = snd_seq_ev_is_direct(event); 603 604 dest = get_event_dest_client(event, filter); 605 if (dest == NULL) 606 goto __skip; 607 dest_port = snd_seq_port_use_ptr(dest, event->dest.port); 608 if (dest_port == NULL) 609 goto __skip; 610 611 /* check permission */ 612 if (! check_port_perm(dest_port, SNDRV_SEQ_PORT_CAP_WRITE)) { 613 result = -EPERM; 614 goto __skip; 615 } 616 617 if (dest_port->timestamping) 618 update_timestamp_of_queue(event, dest_port->time_queue, 619 dest_port->time_real); 620 621 switch (dest->type) { 622 case USER_CLIENT: 623 if (dest->data.user.fifo) 624 result = snd_seq_fifo_event_in(dest->data.user.fifo, event); 625 break; 626 627 case KERNEL_CLIENT: 628 if (dest_port->event_input == NULL) 629 break; 630 result = dest_port->event_input(event, direct, 631 dest_port->private_data, 632 atomic, hop); 633 break; 634 default: 635 break; 636 } 637 638 __skip: 639 if (dest_port) 640 snd_seq_port_unlock(dest_port); 641 if (dest) 642 snd_seq_client_unlock(dest); 643 644 if (result < 0 && !direct) { 645 result = bounce_error_event(client, event, result, atomic, hop); 646 } 647 return result; 648 } 649 650 651 /* 652 * send the event to all subscribers: 653 */ 654 static int deliver_to_subscribers(struct snd_seq_client *client, 655 struct snd_seq_event *event, 656 int atomic, int hop) 657 { 658 struct snd_seq_subscribers *subs; 659 int err = 0, num_ev = 0; 660 struct snd_seq_event event_saved; 661 struct snd_seq_client_port *src_port; 662 struct list_head *p; 663 struct snd_seq_port_subs_info *grp; 664 665 src_port = snd_seq_port_use_ptr(client, event->source.port); 666 if (src_port == NULL) 667 return -EINVAL; /* invalid source port */ 668 /* save original event record */ 669 event_saved = *event; 670 grp = &src_port->c_src; 671 672 /* lock list */ 673 if (atomic) 674 read_lock(&grp->list_lock); 675 else 676 down_read(&grp->list_mutex); 677 list_for_each(p, &grp->list_head) { 678 subs = list_entry(p, struct snd_seq_subscribers, src_list); 679 event->dest = subs->info.dest; 680 if (subs->info.flags & SNDRV_SEQ_PORT_SUBS_TIMESTAMP) 681 /* convert time according to flag with subscription */ 682 update_timestamp_of_queue(event, subs->info.queue, 683 subs->info.flags & SNDRV_SEQ_PORT_SUBS_TIME_REAL); 684 err = snd_seq_deliver_single_event(client, event, 685 0, atomic, hop); 686 if (err < 0) 687 break; 688 num_ev++; 689 /* restore original event record */ 690 *event = event_saved; 691 } 692 if (atomic) 693 read_unlock(&grp->list_lock); 694 else 695 up_read(&grp->list_mutex); 696 *event = event_saved; /* restore */ 697 snd_seq_port_unlock(src_port); 698 return (err < 0) ? err : num_ev; 699 } 700 701 702 #ifdef SUPPORT_BROADCAST 703 /* 704 * broadcast to all ports: 705 */ 706 static int port_broadcast_event(struct snd_seq_client *client, 707 struct snd_seq_event *event, 708 int atomic, int hop) 709 { 710 int num_ev = 0, err = 0; 711 struct snd_seq_client *dest_client; 712 struct list_head *p; 713 714 dest_client = get_event_dest_client(event, SNDRV_SEQ_FILTER_BROADCAST); 715 if (dest_client == NULL) 716 return 0; /* no matching destination */ 717 718 read_lock(&dest_client->ports_lock); 719 list_for_each(p, &dest_client->ports_list_head) { 720 struct snd_seq_client_port *port = list_entry(p, struct snd_seq_client_port, list); 721 event->dest.port = port->addr.port; 722 /* pass NULL as source client to avoid error bounce */ 723 err = snd_seq_deliver_single_event(NULL, event, 724 SNDRV_SEQ_FILTER_BROADCAST, 725 atomic, hop); 726 if (err < 0) 727 break; 728 num_ev++; 729 } 730 read_unlock(&dest_client->ports_lock); 731 snd_seq_client_unlock(dest_client); 732 event->dest.port = SNDRV_SEQ_ADDRESS_BROADCAST; /* restore */ 733 return (err < 0) ? err : num_ev; 734 } 735 736 /* 737 * send the event to all clients: 738 * if destination port is also ADDRESS_BROADCAST, deliver to all ports. 739 */ 740 static int broadcast_event(struct snd_seq_client *client, 741 struct snd_seq_event *event, int atomic, int hop) 742 { 743 int err = 0, num_ev = 0; 744 int dest; 745 struct snd_seq_addr addr; 746 747 addr = event->dest; /* save */ 748 749 for (dest = 0; dest < SNDRV_SEQ_MAX_CLIENTS; dest++) { 750 /* don't send to itself */ 751 if (dest == client->number) 752 continue; 753 event->dest.client = dest; 754 event->dest.port = addr.port; 755 if (addr.port == SNDRV_SEQ_ADDRESS_BROADCAST) 756 err = port_broadcast_event(client, event, atomic, hop); 757 else 758 /* pass NULL as source client to avoid error bounce */ 759 err = snd_seq_deliver_single_event(NULL, event, 760 SNDRV_SEQ_FILTER_BROADCAST, 761 atomic, hop); 762 if (err < 0) 763 break; 764 num_ev += err; 765 } 766 event->dest = addr; /* restore */ 767 return (err < 0) ? err : num_ev; 768 } 769 770 771 /* multicast - not supported yet */ 772 static int multicast_event(struct snd_seq_client *client, struct snd_seq_event *event, 773 int atomic, int hop) 774 { 775 snd_printd("seq: multicast not supported yet.\n"); 776 return 0; /* ignored */ 777 } 778 #endif /* SUPPORT_BROADCAST */ 779 780 781 /* deliver an event to the destination port(s). 782 * if the event is to subscribers or broadcast, the event is dispatched 783 * to multiple targets. 784 * 785 * RETURN VALUE: n > 0 : the number of delivered events. 786 * n == 0 : the event was not passed to any client. 787 * n < 0 : error - event was not processed. 788 */ 789 static int snd_seq_deliver_event(struct snd_seq_client *client, struct snd_seq_event *event, 790 int atomic, int hop) 791 { 792 int result; 793 794 hop++; 795 if (hop >= SNDRV_SEQ_MAX_HOPS) { 796 snd_printd("too long delivery path (%d:%d->%d:%d)\n", 797 event->source.client, event->source.port, 798 event->dest.client, event->dest.port); 799 return -EMLINK; 800 } 801 802 if (event->queue == SNDRV_SEQ_ADDRESS_SUBSCRIBERS || 803 event->dest.client == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) 804 result = deliver_to_subscribers(client, event, atomic, hop); 805 #ifdef SUPPORT_BROADCAST 806 else if (event->queue == SNDRV_SEQ_ADDRESS_BROADCAST || 807 event->dest.client == SNDRV_SEQ_ADDRESS_BROADCAST) 808 result = broadcast_event(client, event, atomic, hop); 809 else if (event->dest.client >= SNDRV_SEQ_MAX_CLIENTS) 810 result = multicast_event(client, event, atomic, hop); 811 else if (event->dest.port == SNDRV_SEQ_ADDRESS_BROADCAST) 812 result = port_broadcast_event(client, event, atomic, hop); 813 #endif 814 else 815 result = snd_seq_deliver_single_event(client, event, 0, atomic, hop); 816 817 return result; 818 } 819 820 /* 821 * dispatch an event cell: 822 * This function is called only from queue check routines in timer 823 * interrupts or after enqueued. 824 * The event cell shall be released or re-queued in this function. 825 * 826 * RETURN VALUE: n > 0 : the number of delivered events. 827 * n == 0 : the event was not passed to any client. 828 * n < 0 : error - event was not processed. 829 */ 830 int snd_seq_dispatch_event(struct snd_seq_event_cell *cell, int atomic, int hop) 831 { 832 struct snd_seq_client *client; 833 int result; 834 835 snd_assert(cell != NULL, return -EINVAL); 836 837 client = snd_seq_client_use_ptr(cell->event.source.client); 838 if (client == NULL) { 839 snd_seq_cell_free(cell); /* release this cell */ 840 return -EINVAL; 841 } 842 843 if (cell->event.type == SNDRV_SEQ_EVENT_NOTE) { 844 /* NOTE event: 845 * the event cell is re-used as a NOTE-OFF event and 846 * enqueued again. 847 */ 848 struct snd_seq_event tmpev, *ev; 849 850 /* reserve this event to enqueue note-off later */ 851 tmpev = cell->event; 852 tmpev.type = SNDRV_SEQ_EVENT_NOTEON; 853 result = snd_seq_deliver_event(client, &tmpev, atomic, hop); 854 855 /* 856 * This was originally a note event. We now re-use the 857 * cell for the note-off event. 858 */ 859 860 ev = &cell->event; 861 ev->type = SNDRV_SEQ_EVENT_NOTEOFF; 862 ev->flags |= SNDRV_SEQ_PRIORITY_HIGH; 863 864 /* add the duration time */ 865 switch (ev->flags & SNDRV_SEQ_TIME_STAMP_MASK) { 866 case SNDRV_SEQ_TIME_STAMP_TICK: 867 ev->time.tick += ev->data.note.duration; 868 break; 869 case SNDRV_SEQ_TIME_STAMP_REAL: 870 /* unit for duration is ms */ 871 ev->time.time.tv_nsec += 1000000 * (ev->data.note.duration % 1000); 872 ev->time.time.tv_sec += ev->data.note.duration / 1000 + 873 ev->time.time.tv_nsec / 1000000000; 874 ev->time.time.tv_nsec %= 1000000000; 875 break; 876 } 877 ev->data.note.velocity = ev->data.note.off_velocity; 878 879 /* Now queue this cell as the note off event */ 880 if (snd_seq_enqueue_event(cell, atomic, hop) < 0) 881 snd_seq_cell_free(cell); /* release this cell */ 882 883 } else { 884 /* Normal events: 885 * event cell is freed after processing the event 886 */ 887 888 result = snd_seq_deliver_event(client, &cell->event, atomic, hop); 889 snd_seq_cell_free(cell); 890 } 891 892 snd_seq_client_unlock(client); 893 return result; 894 } 895 896 897 /* Allocate a cell from client pool and enqueue it to queue: 898 * if pool is empty and blocking is TRUE, sleep until a new cell is 899 * available. 900 */ 901 static int snd_seq_client_enqueue_event(struct snd_seq_client *client, 902 struct snd_seq_event *event, 903 struct file *file, int blocking, 904 int atomic, int hop) 905 { 906 struct snd_seq_event_cell *cell; 907 int err; 908 909 /* special queue values - force direct passing */ 910 if (event->queue == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) { 911 event->dest.client = SNDRV_SEQ_ADDRESS_SUBSCRIBERS; 912 event->queue = SNDRV_SEQ_QUEUE_DIRECT; 913 } else 914 #ifdef SUPPORT_BROADCAST 915 if (event->queue == SNDRV_SEQ_ADDRESS_BROADCAST) { 916 event->dest.client = SNDRV_SEQ_ADDRESS_BROADCAST; 917 event->queue = SNDRV_SEQ_QUEUE_DIRECT; 918 } 919 #endif 920 if (event->dest.client == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) { 921 /* check presence of source port */ 922 struct snd_seq_client_port *src_port = snd_seq_port_use_ptr(client, event->source.port); 923 if (src_port == NULL) 924 return -EINVAL; 925 snd_seq_port_unlock(src_port); 926 } 927 928 /* direct event processing without enqueued */ 929 if (snd_seq_ev_is_direct(event)) { 930 if (event->type == SNDRV_SEQ_EVENT_NOTE) 931 return -EINVAL; /* this event must be enqueued! */ 932 return snd_seq_deliver_event(client, event, atomic, hop); 933 } 934 935 /* Not direct, normal queuing */ 936 if (snd_seq_queue_is_used(event->queue, client->number) <= 0) 937 return -EINVAL; /* invalid queue */ 938 if (! snd_seq_write_pool_allocated(client)) 939 return -ENXIO; /* queue is not allocated */ 940 941 /* allocate an event cell */ 942 err = snd_seq_event_dup(client->pool, event, &cell, !blocking || atomic, file); 943 if (err < 0) 944 return err; 945 946 /* we got a cell. enqueue it. */ 947 if ((err = snd_seq_enqueue_event(cell, atomic, hop)) < 0) { 948 snd_seq_cell_free(cell); 949 return err; 950 } 951 952 return 0; 953 } 954 955 956 /* 957 * check validity of event type and data length. 958 * return non-zero if invalid. 959 */ 960 static int check_event_type_and_length(struct snd_seq_event *ev) 961 { 962 switch (snd_seq_ev_length_type(ev)) { 963 case SNDRV_SEQ_EVENT_LENGTH_FIXED: 964 if (snd_seq_ev_is_variable_type(ev)) 965 return -EINVAL; 966 break; 967 case SNDRV_SEQ_EVENT_LENGTH_VARIABLE: 968 if (! snd_seq_ev_is_variable_type(ev) || 969 (ev->data.ext.len & ~SNDRV_SEQ_EXT_MASK) >= SNDRV_SEQ_MAX_EVENT_LEN) 970 return -EINVAL; 971 break; 972 case SNDRV_SEQ_EVENT_LENGTH_VARUSR: 973 if (! snd_seq_ev_is_instr_type(ev) || 974 ! snd_seq_ev_is_direct(ev)) 975 return -EINVAL; 976 break; 977 } 978 return 0; 979 } 980 981 982 /* handle write() */ 983 /* possible error values: 984 * -ENXIO invalid client or file open mode 985 * -ENOMEM malloc failed 986 * -EFAULT seg. fault during copy from user space 987 * -EINVAL invalid event 988 * -EAGAIN no space in output pool 989 * -EINTR interrupts while sleep 990 * -EMLINK too many hops 991 * others depends on return value from driver callback 992 */ 993 static ssize_t snd_seq_write(struct file *file, const char __user *buf, 994 size_t count, loff_t *offset) 995 { 996 struct snd_seq_client *client = file->private_data; 997 int written = 0, len; 998 int err = -EINVAL; 999 struct snd_seq_event event; 1000 1001 if (!(snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT)) 1002 return -ENXIO; 1003 1004 /* check client structures are in place */ 1005 snd_assert(client != NULL, return -ENXIO); 1006 1007 if (!client->accept_output || client->pool == NULL) 1008 return -ENXIO; 1009 1010 /* allocate the pool now if the pool is not allocated yet */ 1011 if (client->pool->size > 0 && !snd_seq_write_pool_allocated(client)) { 1012 if (snd_seq_pool_init(client->pool) < 0) 1013 return -ENOMEM; 1014 } 1015 1016 /* only process whole events */ 1017 while (count >= sizeof(struct snd_seq_event)) { 1018 /* Read in the event header from the user */ 1019 len = sizeof(event); 1020 if (copy_from_user(&event, buf, len)) { 1021 err = -EFAULT; 1022 break; 1023 } 1024 event.source.client = client->number; /* fill in client number */ 1025 /* Check for extension data length */ 1026 if (check_event_type_and_length(&event)) { 1027 err = -EINVAL; 1028 break; 1029 } 1030 1031 /* check for special events */ 1032 if (event.type == SNDRV_SEQ_EVENT_NONE) 1033 goto __skip_event; 1034 else if (snd_seq_ev_is_reserved(&event)) { 1035 err = -EINVAL; 1036 break; 1037 } 1038 1039 if (snd_seq_ev_is_variable(&event)) { 1040 int extlen = event.data.ext.len & ~SNDRV_SEQ_EXT_MASK; 1041 if ((size_t)(extlen + len) > count) { 1042 /* back out, will get an error this time or next */ 1043 err = -EINVAL; 1044 break; 1045 } 1046 /* set user space pointer */ 1047 event.data.ext.len = extlen | SNDRV_SEQ_EXT_USRPTR; 1048 event.data.ext.ptr = (char __force *)buf 1049 + sizeof(struct snd_seq_event); 1050 len += extlen; /* increment data length */ 1051 } else { 1052 #ifdef CONFIG_COMPAT 1053 if (client->convert32 && snd_seq_ev_is_varusr(&event)) { 1054 void *ptr = compat_ptr(event.data.raw32.d[1]); 1055 event.data.ext.ptr = ptr; 1056 } 1057 #endif 1058 } 1059 1060 /* ok, enqueue it */ 1061 err = snd_seq_client_enqueue_event(client, &event, file, 1062 !(file->f_flags & O_NONBLOCK), 1063 0, 0); 1064 if (err < 0) 1065 break; 1066 1067 __skip_event: 1068 /* Update pointers and counts */ 1069 count -= len; 1070 buf += len; 1071 written += len; 1072 } 1073 1074 return written ? written : err; 1075 } 1076 1077 1078 /* 1079 * handle polling 1080 */ 1081 static unsigned int snd_seq_poll(struct file *file, poll_table * wait) 1082 { 1083 struct snd_seq_client *client = file->private_data; 1084 unsigned int mask = 0; 1085 1086 /* check client structures are in place */ 1087 snd_assert(client != NULL, return -ENXIO); 1088 1089 if ((snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_INPUT) && 1090 client->data.user.fifo) { 1091 1092 /* check if data is available in the outqueue */ 1093 if (snd_seq_fifo_poll_wait(client->data.user.fifo, file, wait)) 1094 mask |= POLLIN | POLLRDNORM; 1095 } 1096 1097 if (snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT) { 1098 1099 /* check if data is available in the pool */ 1100 if (!snd_seq_write_pool_allocated(client) || 1101 snd_seq_pool_poll_wait(client->pool, file, wait)) 1102 mask |= POLLOUT | POLLWRNORM; 1103 } 1104 1105 return mask; 1106 } 1107 1108 1109 /*-----------------------------------------------------*/ 1110 1111 1112 /* SYSTEM_INFO ioctl() */ 1113 static int snd_seq_ioctl_system_info(struct snd_seq_client *client, void __user *arg) 1114 { 1115 struct snd_seq_system_info info; 1116 1117 memset(&info, 0, sizeof(info)); 1118 /* fill the info fields */ 1119 info.queues = SNDRV_SEQ_MAX_QUEUES; 1120 info.clients = SNDRV_SEQ_MAX_CLIENTS; 1121 info.ports = 256; /* fixed limit */ 1122 info.channels = 256; /* fixed limit */ 1123 info.cur_clients = client_usage.cur; 1124 info.cur_queues = snd_seq_queue_get_cur_queues(); 1125 1126 if (copy_to_user(arg, &info, sizeof(info))) 1127 return -EFAULT; 1128 return 0; 1129 } 1130 1131 1132 /* RUNNING_MODE ioctl() */ 1133 static int snd_seq_ioctl_running_mode(struct snd_seq_client *client, void __user *arg) 1134 { 1135 struct snd_seq_running_info info; 1136 struct snd_seq_client *cptr; 1137 int err = 0; 1138 1139 if (copy_from_user(&info, arg, sizeof(info))) 1140 return -EFAULT; 1141 1142 /* requested client number */ 1143 cptr = snd_seq_client_use_ptr(info.client); 1144 if (cptr == NULL) 1145 return -ENOENT; /* don't change !!! */ 1146 1147 #ifdef SNDRV_BIG_ENDIAN 1148 if (! info.big_endian) { 1149 err = -EINVAL; 1150 goto __err; 1151 } 1152 #else 1153 if (info.big_endian) { 1154 err = -EINVAL; 1155 goto __err; 1156 } 1157 1158 #endif 1159 if (info.cpu_mode > sizeof(long)) { 1160 err = -EINVAL; 1161 goto __err; 1162 } 1163 cptr->convert32 = (info.cpu_mode < sizeof(long)); 1164 __err: 1165 snd_seq_client_unlock(cptr); 1166 return err; 1167 } 1168 1169 /* CLIENT_INFO ioctl() */ 1170 static void get_client_info(struct snd_seq_client *cptr, 1171 struct snd_seq_client_info *info) 1172 { 1173 info->client = cptr->number; 1174 1175 /* fill the info fields */ 1176 info->type = cptr->type; 1177 strcpy(info->name, cptr->name); 1178 info->filter = cptr->filter; 1179 info->event_lost = cptr->event_lost; 1180 memcpy(info->event_filter, cptr->event_filter, 32); 1181 info->num_ports = cptr->num_ports; 1182 memset(info->reserved, 0, sizeof(info->reserved)); 1183 } 1184 1185 static int snd_seq_ioctl_get_client_info(struct snd_seq_client *client, 1186 void __user *arg) 1187 { 1188 struct snd_seq_client *cptr; 1189 struct snd_seq_client_info client_info; 1190 1191 if (copy_from_user(&client_info, arg, sizeof(client_info))) 1192 return -EFAULT; 1193 1194 /* requested client number */ 1195 cptr = snd_seq_client_use_ptr(client_info.client); 1196 if (cptr == NULL) 1197 return -ENOENT; /* don't change !!! */ 1198 1199 get_client_info(cptr, &client_info); 1200 snd_seq_client_unlock(cptr); 1201 1202 if (copy_to_user(arg, &client_info, sizeof(client_info))) 1203 return -EFAULT; 1204 return 0; 1205 } 1206 1207 1208 /* CLIENT_INFO ioctl() */ 1209 static int snd_seq_ioctl_set_client_info(struct snd_seq_client *client, 1210 void __user *arg) 1211 { 1212 struct snd_seq_client_info client_info; 1213 1214 if (copy_from_user(&client_info, arg, sizeof(client_info))) 1215 return -EFAULT; 1216 1217 /* it is not allowed to set the info fields for an another client */ 1218 if (client->number != client_info.client) 1219 return -EPERM; 1220 /* also client type must be set now */ 1221 if (client->type != client_info.type) 1222 return -EINVAL; 1223 1224 /* fill the info fields */ 1225 if (client_info.name[0]) 1226 strlcpy(client->name, client_info.name, sizeof(client->name)); 1227 1228 client->filter = client_info.filter; 1229 client->event_lost = client_info.event_lost; 1230 memcpy(client->event_filter, client_info.event_filter, 32); 1231 1232 return 0; 1233 } 1234 1235 1236 /* 1237 * CREATE PORT ioctl() 1238 */ 1239 static int snd_seq_ioctl_create_port(struct snd_seq_client *client, 1240 void __user *arg) 1241 { 1242 struct snd_seq_client_port *port; 1243 struct snd_seq_port_info info; 1244 struct snd_seq_port_callback *callback; 1245 1246 if (copy_from_user(&info, arg, sizeof(info))) 1247 return -EFAULT; 1248 1249 /* it is not allowed to create the port for an another client */ 1250 if (info.addr.client != client->number) 1251 return -EPERM; 1252 1253 port = snd_seq_create_port(client, (info.flags & SNDRV_SEQ_PORT_FLG_GIVEN_PORT) ? info.addr.port : -1); 1254 if (port == NULL) 1255 return -ENOMEM; 1256 1257 if (client->type == USER_CLIENT && info.kernel) { 1258 snd_seq_delete_port(client, port->addr.port); 1259 return -EINVAL; 1260 } 1261 if (client->type == KERNEL_CLIENT) { 1262 if ((callback = info.kernel) != NULL) { 1263 if (callback->owner) 1264 port->owner = callback->owner; 1265 port->private_data = callback->private_data; 1266 port->private_free = callback->private_free; 1267 port->callback_all = callback->callback_all; 1268 port->event_input = callback->event_input; 1269 port->c_src.open = callback->subscribe; 1270 port->c_src.close = callback->unsubscribe; 1271 port->c_dest.open = callback->use; 1272 port->c_dest.close = callback->unuse; 1273 } 1274 } 1275 1276 info.addr = port->addr; 1277 1278 snd_seq_set_port_info(port, &info); 1279 snd_seq_system_client_ev_port_start(port->addr.client, port->addr.port); 1280 1281 if (copy_to_user(arg, &info, sizeof(info))) 1282 return -EFAULT; 1283 1284 return 0; 1285 } 1286 1287 /* 1288 * DELETE PORT ioctl() 1289 */ 1290 static int snd_seq_ioctl_delete_port(struct snd_seq_client *client, 1291 void __user *arg) 1292 { 1293 struct snd_seq_port_info info; 1294 int err; 1295 1296 /* set passed parameters */ 1297 if (copy_from_user(&info, arg, sizeof(info))) 1298 return -EFAULT; 1299 1300 /* it is not allowed to remove the port for an another client */ 1301 if (info.addr.client != client->number) 1302 return -EPERM; 1303 1304 err = snd_seq_delete_port(client, info.addr.port); 1305 if (err >= 0) 1306 snd_seq_system_client_ev_port_exit(client->number, info.addr.port); 1307 return err; 1308 } 1309 1310 1311 /* 1312 * GET_PORT_INFO ioctl() (on any client) 1313 */ 1314 static int snd_seq_ioctl_get_port_info(struct snd_seq_client *client, 1315 void __user *arg) 1316 { 1317 struct snd_seq_client *cptr; 1318 struct snd_seq_client_port *port; 1319 struct snd_seq_port_info info; 1320 1321 if (copy_from_user(&info, arg, sizeof(info))) 1322 return -EFAULT; 1323 cptr = snd_seq_client_use_ptr(info.addr.client); 1324 if (cptr == NULL) 1325 return -ENXIO; 1326 1327 port = snd_seq_port_use_ptr(cptr, info.addr.port); 1328 if (port == NULL) { 1329 snd_seq_client_unlock(cptr); 1330 return -ENOENT; /* don't change */ 1331 } 1332 1333 /* get port info */ 1334 snd_seq_get_port_info(port, &info); 1335 snd_seq_port_unlock(port); 1336 snd_seq_client_unlock(cptr); 1337 1338 if (copy_to_user(arg, &info, sizeof(info))) 1339 return -EFAULT; 1340 return 0; 1341 } 1342 1343 1344 /* 1345 * SET_PORT_INFO ioctl() (only ports on this/own client) 1346 */ 1347 static int snd_seq_ioctl_set_port_info(struct snd_seq_client *client, 1348 void __user *arg) 1349 { 1350 struct snd_seq_client_port *port; 1351 struct snd_seq_port_info info; 1352 1353 if (copy_from_user(&info, arg, sizeof(info))) 1354 return -EFAULT; 1355 1356 if (info.addr.client != client->number) /* only set our own ports ! */ 1357 return -EPERM; 1358 port = snd_seq_port_use_ptr(client, info.addr.port); 1359 if (port) { 1360 snd_seq_set_port_info(port, &info); 1361 snd_seq_port_unlock(port); 1362 } 1363 return 0; 1364 } 1365 1366 1367 /* 1368 * port subscription (connection) 1369 */ 1370 #define PERM_RD (SNDRV_SEQ_PORT_CAP_READ|SNDRV_SEQ_PORT_CAP_SUBS_READ) 1371 #define PERM_WR (SNDRV_SEQ_PORT_CAP_WRITE|SNDRV_SEQ_PORT_CAP_SUBS_WRITE) 1372 1373 static int check_subscription_permission(struct snd_seq_client *client, 1374 struct snd_seq_client_port *sport, 1375 struct snd_seq_client_port *dport, 1376 struct snd_seq_port_subscribe *subs) 1377 { 1378 if (client->number != subs->sender.client && 1379 client->number != subs->dest.client) { 1380 /* connection by third client - check export permission */ 1381 if (check_port_perm(sport, SNDRV_SEQ_PORT_CAP_NO_EXPORT)) 1382 return -EPERM; 1383 if (check_port_perm(dport, SNDRV_SEQ_PORT_CAP_NO_EXPORT)) 1384 return -EPERM; 1385 } 1386 1387 /* check read permission */ 1388 /* if sender or receiver is the subscribing client itself, 1389 * no permission check is necessary 1390 */ 1391 if (client->number != subs->sender.client) { 1392 if (! check_port_perm(sport, PERM_RD)) 1393 return -EPERM; 1394 } 1395 /* check write permission */ 1396 if (client->number != subs->dest.client) { 1397 if (! check_port_perm(dport, PERM_WR)) 1398 return -EPERM; 1399 } 1400 return 0; 1401 } 1402 1403 /* 1404 * send an subscription notify event to user client: 1405 * client must be user client. 1406 */ 1407 int snd_seq_client_notify_subscription(int client, int port, 1408 struct snd_seq_port_subscribe *info, 1409 int evtype) 1410 { 1411 struct snd_seq_event event; 1412 1413 memset(&event, 0, sizeof(event)); 1414 event.type = evtype; 1415 event.data.connect.dest = info->dest; 1416 event.data.connect.sender = info->sender; 1417 1418 return snd_seq_system_notify(client, port, &event); /* non-atomic */ 1419 } 1420 1421 1422 /* 1423 * add to port's subscription list IOCTL interface 1424 */ 1425 static int snd_seq_ioctl_subscribe_port(struct snd_seq_client *client, 1426 void __user *arg) 1427 { 1428 int result = -EINVAL; 1429 struct snd_seq_client *receiver = NULL, *sender = NULL; 1430 struct snd_seq_client_port *sport = NULL, *dport = NULL; 1431 struct snd_seq_port_subscribe subs; 1432 1433 if (copy_from_user(&subs, arg, sizeof(subs))) 1434 return -EFAULT; 1435 1436 if ((receiver = snd_seq_client_use_ptr(subs.dest.client)) == NULL) 1437 goto __end; 1438 if ((sender = snd_seq_client_use_ptr(subs.sender.client)) == NULL) 1439 goto __end; 1440 if ((sport = snd_seq_port_use_ptr(sender, subs.sender.port)) == NULL) 1441 goto __end; 1442 if ((dport = snd_seq_port_use_ptr(receiver, subs.dest.port)) == NULL) 1443 goto __end; 1444 1445 result = check_subscription_permission(client, sport, dport, &subs); 1446 if (result < 0) 1447 goto __end; 1448 1449 /* connect them */ 1450 result = snd_seq_port_connect(client, sender, sport, receiver, dport, &subs); 1451 if (! result) /* broadcast announce */ 1452 snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0, 1453 &subs, SNDRV_SEQ_EVENT_PORT_SUBSCRIBED); 1454 __end: 1455 if (sport) 1456 snd_seq_port_unlock(sport); 1457 if (dport) 1458 snd_seq_port_unlock(dport); 1459 if (sender) 1460 snd_seq_client_unlock(sender); 1461 if (receiver) 1462 snd_seq_client_unlock(receiver); 1463 return result; 1464 } 1465 1466 1467 /* 1468 * remove from port's subscription list 1469 */ 1470 static int snd_seq_ioctl_unsubscribe_port(struct snd_seq_client *client, 1471 void __user *arg) 1472 { 1473 int result = -ENXIO; 1474 struct snd_seq_client *receiver = NULL, *sender = NULL; 1475 struct snd_seq_client_port *sport = NULL, *dport = NULL; 1476 struct snd_seq_port_subscribe subs; 1477 1478 if (copy_from_user(&subs, arg, sizeof(subs))) 1479 return -EFAULT; 1480 1481 if ((receiver = snd_seq_client_use_ptr(subs.dest.client)) == NULL) 1482 goto __end; 1483 if ((sender = snd_seq_client_use_ptr(subs.sender.client)) == NULL) 1484 goto __end; 1485 if ((sport = snd_seq_port_use_ptr(sender, subs.sender.port)) == NULL) 1486 goto __end; 1487 if ((dport = snd_seq_port_use_ptr(receiver, subs.dest.port)) == NULL) 1488 goto __end; 1489 1490 result = check_subscription_permission(client, sport, dport, &subs); 1491 if (result < 0) 1492 goto __end; 1493 1494 result = snd_seq_port_disconnect(client, sender, sport, receiver, dport, &subs); 1495 if (! result) /* broadcast announce */ 1496 snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0, 1497 &subs, SNDRV_SEQ_EVENT_PORT_UNSUBSCRIBED); 1498 __end: 1499 if (sport) 1500 snd_seq_port_unlock(sport); 1501 if (dport) 1502 snd_seq_port_unlock(dport); 1503 if (sender) 1504 snd_seq_client_unlock(sender); 1505 if (receiver) 1506 snd_seq_client_unlock(receiver); 1507 return result; 1508 } 1509 1510 1511 /* CREATE_QUEUE ioctl() */ 1512 static int snd_seq_ioctl_create_queue(struct snd_seq_client *client, 1513 void __user *arg) 1514 { 1515 struct snd_seq_queue_info info; 1516 int result; 1517 struct snd_seq_queue *q; 1518 1519 if (copy_from_user(&info, arg, sizeof(info))) 1520 return -EFAULT; 1521 1522 result = snd_seq_queue_alloc(client->number, info.locked, info.flags); 1523 if (result < 0) 1524 return result; 1525 1526 q = queueptr(result); 1527 if (q == NULL) 1528 return -EINVAL; 1529 1530 info.queue = q->queue; 1531 info.locked = q->locked; 1532 info.owner = q->owner; 1533 1534 /* set queue name */ 1535 if (! info.name[0]) 1536 snprintf(info.name, sizeof(info.name), "Queue-%d", q->queue); 1537 strlcpy(q->name, info.name, sizeof(q->name)); 1538 queuefree(q); 1539 1540 if (copy_to_user(arg, &info, sizeof(info))) 1541 return -EFAULT; 1542 1543 return 0; 1544 } 1545 1546 /* DELETE_QUEUE ioctl() */ 1547 static int snd_seq_ioctl_delete_queue(struct snd_seq_client *client, 1548 void __user *arg) 1549 { 1550 struct snd_seq_queue_info info; 1551 1552 if (copy_from_user(&info, arg, sizeof(info))) 1553 return -EFAULT; 1554 1555 return snd_seq_queue_delete(client->number, info.queue); 1556 } 1557 1558 /* GET_QUEUE_INFO ioctl() */ 1559 static int snd_seq_ioctl_get_queue_info(struct snd_seq_client *client, 1560 void __user *arg) 1561 { 1562 struct snd_seq_queue_info info; 1563 struct snd_seq_queue *q; 1564 1565 if (copy_from_user(&info, arg, sizeof(info))) 1566 return -EFAULT; 1567 1568 q = queueptr(info.queue); 1569 if (q == NULL) 1570 return -EINVAL; 1571 1572 memset(&info, 0, sizeof(info)); 1573 info.queue = q->queue; 1574 info.owner = q->owner; 1575 info.locked = q->locked; 1576 strlcpy(info.name, q->name, sizeof(info.name)); 1577 queuefree(q); 1578 1579 if (copy_to_user(arg, &info, sizeof(info))) 1580 return -EFAULT; 1581 1582 return 0; 1583 } 1584 1585 /* SET_QUEUE_INFO ioctl() */ 1586 static int snd_seq_ioctl_set_queue_info(struct snd_seq_client *client, 1587 void __user *arg) 1588 { 1589 struct snd_seq_queue_info info; 1590 struct snd_seq_queue *q; 1591 1592 if (copy_from_user(&info, arg, sizeof(info))) 1593 return -EFAULT; 1594 1595 if (info.owner != client->number) 1596 return -EINVAL; 1597 1598 /* change owner/locked permission */ 1599 if (snd_seq_queue_check_access(info.queue, client->number)) { 1600 if (snd_seq_queue_set_owner(info.queue, client->number, info.locked) < 0) 1601 return -EPERM; 1602 if (info.locked) 1603 snd_seq_queue_use(info.queue, client->number, 1); 1604 } else { 1605 return -EPERM; 1606 } 1607 1608 q = queueptr(info.queue); 1609 if (! q) 1610 return -EINVAL; 1611 if (q->owner != client->number) { 1612 queuefree(q); 1613 return -EPERM; 1614 } 1615 strlcpy(q->name, info.name, sizeof(q->name)); 1616 queuefree(q); 1617 1618 return 0; 1619 } 1620 1621 /* GET_NAMED_QUEUE ioctl() */ 1622 static int snd_seq_ioctl_get_named_queue(struct snd_seq_client *client, void __user *arg) 1623 { 1624 struct snd_seq_queue_info info; 1625 struct snd_seq_queue *q; 1626 1627 if (copy_from_user(&info, arg, sizeof(info))) 1628 return -EFAULT; 1629 1630 q = snd_seq_queue_find_name(info.name); 1631 if (q == NULL) 1632 return -EINVAL; 1633 info.queue = q->queue; 1634 info.owner = q->owner; 1635 info.locked = q->locked; 1636 queuefree(q); 1637 1638 if (copy_to_user(arg, &info, sizeof(info))) 1639 return -EFAULT; 1640 1641 return 0; 1642 } 1643 1644 /* GET_QUEUE_STATUS ioctl() */ 1645 static int snd_seq_ioctl_get_queue_status(struct snd_seq_client *client, 1646 void __user *arg) 1647 { 1648 struct snd_seq_queue_status status; 1649 struct snd_seq_queue *queue; 1650 struct snd_seq_timer *tmr; 1651 1652 if (copy_from_user(&status, arg, sizeof(status))) 1653 return -EFAULT; 1654 1655 queue = queueptr(status.queue); 1656 if (queue == NULL) 1657 return -EINVAL; 1658 memset(&status, 0, sizeof(status)); 1659 status.queue = queue->queue; 1660 1661 tmr = queue->timer; 1662 status.events = queue->tickq->cells + queue->timeq->cells; 1663 1664 status.time = snd_seq_timer_get_cur_time(tmr); 1665 status.tick = snd_seq_timer_get_cur_tick(tmr); 1666 1667 status.running = tmr->running; 1668 1669 status.flags = queue->flags; 1670 queuefree(queue); 1671 1672 if (copy_to_user(arg, &status, sizeof(status))) 1673 return -EFAULT; 1674 return 0; 1675 } 1676 1677 1678 /* GET_QUEUE_TEMPO ioctl() */ 1679 static int snd_seq_ioctl_get_queue_tempo(struct snd_seq_client *client, 1680 void __user *arg) 1681 { 1682 struct snd_seq_queue_tempo tempo; 1683 struct snd_seq_queue *queue; 1684 struct snd_seq_timer *tmr; 1685 1686 if (copy_from_user(&tempo, arg, sizeof(tempo))) 1687 return -EFAULT; 1688 1689 queue = queueptr(tempo.queue); 1690 if (queue == NULL) 1691 return -EINVAL; 1692 memset(&tempo, 0, sizeof(tempo)); 1693 tempo.queue = queue->queue; 1694 1695 tmr = queue->timer; 1696 1697 tempo.tempo = tmr->tempo; 1698 tempo.ppq = tmr->ppq; 1699 tempo.skew_value = tmr->skew; 1700 tempo.skew_base = tmr->skew_base; 1701 queuefree(queue); 1702 1703 if (copy_to_user(arg, &tempo, sizeof(tempo))) 1704 return -EFAULT; 1705 return 0; 1706 } 1707 1708 1709 /* SET_QUEUE_TEMPO ioctl() */ 1710 int snd_seq_set_queue_tempo(int client, struct snd_seq_queue_tempo *tempo) 1711 { 1712 if (!snd_seq_queue_check_access(tempo->queue, client)) 1713 return -EPERM; 1714 return snd_seq_queue_timer_set_tempo(tempo->queue, client, tempo); 1715 } 1716 1717 EXPORT_SYMBOL(snd_seq_set_queue_tempo); 1718 1719 static int snd_seq_ioctl_set_queue_tempo(struct snd_seq_client *client, 1720 void __user *arg) 1721 { 1722 int result; 1723 struct snd_seq_queue_tempo tempo; 1724 1725 if (copy_from_user(&tempo, arg, sizeof(tempo))) 1726 return -EFAULT; 1727 1728 result = snd_seq_set_queue_tempo(client->number, &tempo); 1729 return result < 0 ? result : 0; 1730 } 1731 1732 1733 /* GET_QUEUE_TIMER ioctl() */ 1734 static int snd_seq_ioctl_get_queue_timer(struct snd_seq_client *client, 1735 void __user *arg) 1736 { 1737 struct snd_seq_queue_timer timer; 1738 struct snd_seq_queue *queue; 1739 struct snd_seq_timer *tmr; 1740 1741 if (copy_from_user(&timer, arg, sizeof(timer))) 1742 return -EFAULT; 1743 1744 queue = queueptr(timer.queue); 1745 if (queue == NULL) 1746 return -EINVAL; 1747 1748 if (mutex_lock_interruptible(&queue->timer_mutex)) { 1749 queuefree(queue); 1750 return -ERESTARTSYS; 1751 } 1752 tmr = queue->timer; 1753 memset(&timer, 0, sizeof(timer)); 1754 timer.queue = queue->queue; 1755 1756 timer.type = tmr->type; 1757 if (tmr->type == SNDRV_SEQ_TIMER_ALSA) { 1758 timer.u.alsa.id = tmr->alsa_id; 1759 timer.u.alsa.resolution = tmr->preferred_resolution; 1760 } 1761 mutex_unlock(&queue->timer_mutex); 1762 queuefree(queue); 1763 1764 if (copy_to_user(arg, &timer, sizeof(timer))) 1765 return -EFAULT; 1766 return 0; 1767 } 1768 1769 1770 /* SET_QUEUE_TIMER ioctl() */ 1771 static int snd_seq_ioctl_set_queue_timer(struct snd_seq_client *client, 1772 void __user *arg) 1773 { 1774 int result = 0; 1775 struct snd_seq_queue_timer timer; 1776 1777 if (copy_from_user(&timer, arg, sizeof(timer))) 1778 return -EFAULT; 1779 1780 if (timer.type != SNDRV_SEQ_TIMER_ALSA) 1781 return -EINVAL; 1782 1783 if (snd_seq_queue_check_access(timer.queue, client->number)) { 1784 struct snd_seq_queue *q; 1785 struct snd_seq_timer *tmr; 1786 1787 q = queueptr(timer.queue); 1788 if (q == NULL) 1789 return -ENXIO; 1790 if (mutex_lock_interruptible(&q->timer_mutex)) { 1791 queuefree(q); 1792 return -ERESTARTSYS; 1793 } 1794 tmr = q->timer; 1795 snd_seq_queue_timer_close(timer.queue); 1796 tmr->type = timer.type; 1797 if (tmr->type == SNDRV_SEQ_TIMER_ALSA) { 1798 tmr->alsa_id = timer.u.alsa.id; 1799 tmr->preferred_resolution = timer.u.alsa.resolution; 1800 } 1801 result = snd_seq_queue_timer_open(timer.queue); 1802 mutex_unlock(&q->timer_mutex); 1803 queuefree(q); 1804 } else { 1805 return -EPERM; 1806 } 1807 1808 return result; 1809 } 1810 1811 1812 /* GET_QUEUE_CLIENT ioctl() */ 1813 static int snd_seq_ioctl_get_queue_client(struct snd_seq_client *client, 1814 void __user *arg) 1815 { 1816 struct snd_seq_queue_client info; 1817 int used; 1818 1819 if (copy_from_user(&info, arg, sizeof(info))) 1820 return -EFAULT; 1821 1822 used = snd_seq_queue_is_used(info.queue, client->number); 1823 if (used < 0) 1824 return -EINVAL; 1825 info.used = used; 1826 info.client = client->number; 1827 1828 if (copy_to_user(arg, &info, sizeof(info))) 1829 return -EFAULT; 1830 return 0; 1831 } 1832 1833 1834 /* SET_QUEUE_CLIENT ioctl() */ 1835 static int snd_seq_ioctl_set_queue_client(struct snd_seq_client *client, 1836 void __user *arg) 1837 { 1838 int err; 1839 struct snd_seq_queue_client info; 1840 1841 if (copy_from_user(&info, arg, sizeof(info))) 1842 return -EFAULT; 1843 1844 if (info.used >= 0) { 1845 err = snd_seq_queue_use(info.queue, client->number, info.used); 1846 if (err < 0) 1847 return err; 1848 } 1849 1850 return snd_seq_ioctl_get_queue_client(client, arg); 1851 } 1852 1853 1854 /* GET_CLIENT_POOL ioctl() */ 1855 static int snd_seq_ioctl_get_client_pool(struct snd_seq_client *client, 1856 void __user *arg) 1857 { 1858 struct snd_seq_client_pool info; 1859 struct snd_seq_client *cptr; 1860 1861 if (copy_from_user(&info, arg, sizeof(info))) 1862 return -EFAULT; 1863 1864 cptr = snd_seq_client_use_ptr(info.client); 1865 if (cptr == NULL) 1866 return -ENOENT; 1867 memset(&info, 0, sizeof(info)); 1868 info.output_pool = cptr->pool->size; 1869 info.output_room = cptr->pool->room; 1870 info.output_free = info.output_pool; 1871 info.output_free = snd_seq_unused_cells(cptr->pool); 1872 if (cptr->type == USER_CLIENT) { 1873 info.input_pool = cptr->data.user.fifo_pool_size; 1874 info.input_free = info.input_pool; 1875 if (cptr->data.user.fifo) 1876 info.input_free = snd_seq_unused_cells(cptr->data.user.fifo->pool); 1877 } else { 1878 info.input_pool = 0; 1879 info.input_free = 0; 1880 } 1881 snd_seq_client_unlock(cptr); 1882 1883 if (copy_to_user(arg, &info, sizeof(info))) 1884 return -EFAULT; 1885 return 0; 1886 } 1887 1888 /* SET_CLIENT_POOL ioctl() */ 1889 static int snd_seq_ioctl_set_client_pool(struct snd_seq_client *client, 1890 void __user *arg) 1891 { 1892 struct snd_seq_client_pool info; 1893 int rc; 1894 1895 if (copy_from_user(&info, arg, sizeof(info))) 1896 return -EFAULT; 1897 1898 if (client->number != info.client) 1899 return -EINVAL; /* can't change other clients */ 1900 1901 if (info.output_pool >= 1 && info.output_pool <= SNDRV_SEQ_MAX_EVENTS && 1902 (! snd_seq_write_pool_allocated(client) || 1903 info.output_pool != client->pool->size)) { 1904 if (snd_seq_write_pool_allocated(client)) { 1905 /* remove all existing cells */ 1906 snd_seq_queue_client_leave_cells(client->number); 1907 snd_seq_pool_done(client->pool); 1908 } 1909 client->pool->size = info.output_pool; 1910 rc = snd_seq_pool_init(client->pool); 1911 if (rc < 0) 1912 return rc; 1913 } 1914 if (client->type == USER_CLIENT && client->data.user.fifo != NULL && 1915 info.input_pool >= 1 && 1916 info.input_pool <= SNDRV_SEQ_MAX_CLIENT_EVENTS && 1917 info.input_pool != client->data.user.fifo_pool_size) { 1918 /* change pool size */ 1919 rc = snd_seq_fifo_resize(client->data.user.fifo, info.input_pool); 1920 if (rc < 0) 1921 return rc; 1922 client->data.user.fifo_pool_size = info.input_pool; 1923 } 1924 if (info.output_room >= 1 && 1925 info.output_room <= client->pool->size) { 1926 client->pool->room = info.output_room; 1927 } 1928 1929 return snd_seq_ioctl_get_client_pool(client, arg); 1930 } 1931 1932 1933 /* REMOVE_EVENTS ioctl() */ 1934 static int snd_seq_ioctl_remove_events(struct snd_seq_client *client, 1935 void __user *arg) 1936 { 1937 struct snd_seq_remove_events info; 1938 1939 if (copy_from_user(&info, arg, sizeof(info))) 1940 return -EFAULT; 1941 1942 /* 1943 * Input mostly not implemented XXX. 1944 */ 1945 if (info.remove_mode & SNDRV_SEQ_REMOVE_INPUT) { 1946 /* 1947 * No restrictions so for a user client we can clear 1948 * the whole fifo 1949 */ 1950 if (client->type == USER_CLIENT) 1951 snd_seq_fifo_clear(client->data.user.fifo); 1952 } 1953 1954 if (info.remove_mode & SNDRV_SEQ_REMOVE_OUTPUT) 1955 snd_seq_queue_remove_cells(client->number, &info); 1956 1957 return 0; 1958 } 1959 1960 1961 /* 1962 * get subscription info 1963 */ 1964 static int snd_seq_ioctl_get_subscription(struct snd_seq_client *client, 1965 void __user *arg) 1966 { 1967 int result; 1968 struct snd_seq_client *sender = NULL; 1969 struct snd_seq_client_port *sport = NULL; 1970 struct snd_seq_port_subscribe subs; 1971 struct snd_seq_subscribers *p; 1972 1973 if (copy_from_user(&subs, arg, sizeof(subs))) 1974 return -EFAULT; 1975 1976 result = -EINVAL; 1977 if ((sender = snd_seq_client_use_ptr(subs.sender.client)) == NULL) 1978 goto __end; 1979 if ((sport = snd_seq_port_use_ptr(sender, subs.sender.port)) == NULL) 1980 goto __end; 1981 p = snd_seq_port_get_subscription(&sport->c_src, &subs.dest); 1982 if (p) { 1983 result = 0; 1984 subs = p->info; 1985 } else 1986 result = -ENOENT; 1987 1988 __end: 1989 if (sport) 1990 snd_seq_port_unlock(sport); 1991 if (sender) 1992 snd_seq_client_unlock(sender); 1993 if (result >= 0) { 1994 if (copy_to_user(arg, &subs, sizeof(subs))) 1995 return -EFAULT; 1996 } 1997 return result; 1998 } 1999 2000 2001 /* 2002 * get subscription info - check only its presence 2003 */ 2004 static int snd_seq_ioctl_query_subs(struct snd_seq_client *client, 2005 void __user *arg) 2006 { 2007 int result = -ENXIO; 2008 struct snd_seq_client *cptr = NULL; 2009 struct snd_seq_client_port *port = NULL; 2010 struct snd_seq_query_subs subs; 2011 struct snd_seq_port_subs_info *group; 2012 struct list_head *p; 2013 int i; 2014 2015 if (copy_from_user(&subs, arg, sizeof(subs))) 2016 return -EFAULT; 2017 2018 if ((cptr = snd_seq_client_use_ptr(subs.root.client)) == NULL) 2019 goto __end; 2020 if ((port = snd_seq_port_use_ptr(cptr, subs.root.port)) == NULL) 2021 goto __end; 2022 2023 switch (subs.type) { 2024 case SNDRV_SEQ_QUERY_SUBS_READ: 2025 group = &port->c_src; 2026 break; 2027 case SNDRV_SEQ_QUERY_SUBS_WRITE: 2028 group = &port->c_dest; 2029 break; 2030 default: 2031 goto __end; 2032 } 2033 2034 down_read(&group->list_mutex); 2035 /* search for the subscriber */ 2036 subs.num_subs = group->count; 2037 i = 0; 2038 result = -ENOENT; 2039 list_for_each(p, &group->list_head) { 2040 if (i++ == subs.index) { 2041 /* found! */ 2042 struct snd_seq_subscribers *s; 2043 if (subs.type == SNDRV_SEQ_QUERY_SUBS_READ) { 2044 s = list_entry(p, struct snd_seq_subscribers, src_list); 2045 subs.addr = s->info.dest; 2046 } else { 2047 s = list_entry(p, struct snd_seq_subscribers, dest_list); 2048 subs.addr = s->info.sender; 2049 } 2050 subs.flags = s->info.flags; 2051 subs.queue = s->info.queue; 2052 result = 0; 2053 break; 2054 } 2055 } 2056 up_read(&group->list_mutex); 2057 2058 __end: 2059 if (port) 2060 snd_seq_port_unlock(port); 2061 if (cptr) 2062 snd_seq_client_unlock(cptr); 2063 if (result >= 0) { 2064 if (copy_to_user(arg, &subs, sizeof(subs))) 2065 return -EFAULT; 2066 } 2067 return result; 2068 } 2069 2070 2071 /* 2072 * query next client 2073 */ 2074 static int snd_seq_ioctl_query_next_client(struct snd_seq_client *client, 2075 void __user *arg) 2076 { 2077 struct snd_seq_client *cptr = NULL; 2078 struct snd_seq_client_info info; 2079 2080 if (copy_from_user(&info, arg, sizeof(info))) 2081 return -EFAULT; 2082 2083 /* search for next client */ 2084 info.client++; 2085 if (info.client < 0) 2086 info.client = 0; 2087 for (; info.client < SNDRV_SEQ_MAX_CLIENTS; info.client++) { 2088 cptr = snd_seq_client_use_ptr(info.client); 2089 if (cptr) 2090 break; /* found */ 2091 } 2092 if (cptr == NULL) 2093 return -ENOENT; 2094 2095 get_client_info(cptr, &info); 2096 snd_seq_client_unlock(cptr); 2097 2098 if (copy_to_user(arg, &info, sizeof(info))) 2099 return -EFAULT; 2100 return 0; 2101 } 2102 2103 /* 2104 * query next port 2105 */ 2106 static int snd_seq_ioctl_query_next_port(struct snd_seq_client *client, 2107 void __user *arg) 2108 { 2109 struct snd_seq_client *cptr; 2110 struct snd_seq_client_port *port = NULL; 2111 struct snd_seq_port_info info; 2112 2113 if (copy_from_user(&info, arg, sizeof(info))) 2114 return -EFAULT; 2115 cptr = snd_seq_client_use_ptr(info.addr.client); 2116 if (cptr == NULL) 2117 return -ENXIO; 2118 2119 /* search for next port */ 2120 info.addr.port++; 2121 port = snd_seq_port_query_nearest(cptr, &info); 2122 if (port == NULL) { 2123 snd_seq_client_unlock(cptr); 2124 return -ENOENT; 2125 } 2126 2127 /* get port info */ 2128 info.addr = port->addr; 2129 snd_seq_get_port_info(port, &info); 2130 snd_seq_port_unlock(port); 2131 snd_seq_client_unlock(cptr); 2132 2133 if (copy_to_user(arg, &info, sizeof(info))) 2134 return -EFAULT; 2135 return 0; 2136 } 2137 2138 /* -------------------------------------------------------- */ 2139 2140 static struct seq_ioctl_table { 2141 unsigned int cmd; 2142 int (*func)(struct snd_seq_client *client, void __user * arg); 2143 } ioctl_tables[] = { 2144 { SNDRV_SEQ_IOCTL_SYSTEM_INFO, snd_seq_ioctl_system_info }, 2145 { SNDRV_SEQ_IOCTL_RUNNING_MODE, snd_seq_ioctl_running_mode }, 2146 { SNDRV_SEQ_IOCTL_GET_CLIENT_INFO, snd_seq_ioctl_get_client_info }, 2147 { SNDRV_SEQ_IOCTL_SET_CLIENT_INFO, snd_seq_ioctl_set_client_info }, 2148 { SNDRV_SEQ_IOCTL_CREATE_PORT, snd_seq_ioctl_create_port }, 2149 { SNDRV_SEQ_IOCTL_DELETE_PORT, snd_seq_ioctl_delete_port }, 2150 { SNDRV_SEQ_IOCTL_GET_PORT_INFO, snd_seq_ioctl_get_port_info }, 2151 { SNDRV_SEQ_IOCTL_SET_PORT_INFO, snd_seq_ioctl_set_port_info }, 2152 { SNDRV_SEQ_IOCTL_SUBSCRIBE_PORT, snd_seq_ioctl_subscribe_port }, 2153 { SNDRV_SEQ_IOCTL_UNSUBSCRIBE_PORT, snd_seq_ioctl_unsubscribe_port }, 2154 { SNDRV_SEQ_IOCTL_CREATE_QUEUE, snd_seq_ioctl_create_queue }, 2155 { SNDRV_SEQ_IOCTL_DELETE_QUEUE, snd_seq_ioctl_delete_queue }, 2156 { SNDRV_SEQ_IOCTL_GET_QUEUE_INFO, snd_seq_ioctl_get_queue_info }, 2157 { SNDRV_SEQ_IOCTL_SET_QUEUE_INFO, snd_seq_ioctl_set_queue_info }, 2158 { SNDRV_SEQ_IOCTL_GET_NAMED_QUEUE, snd_seq_ioctl_get_named_queue }, 2159 { SNDRV_SEQ_IOCTL_GET_QUEUE_STATUS, snd_seq_ioctl_get_queue_status }, 2160 { SNDRV_SEQ_IOCTL_GET_QUEUE_TEMPO, snd_seq_ioctl_get_queue_tempo }, 2161 { SNDRV_SEQ_IOCTL_SET_QUEUE_TEMPO, snd_seq_ioctl_set_queue_tempo }, 2162 { SNDRV_SEQ_IOCTL_GET_QUEUE_TIMER, snd_seq_ioctl_get_queue_timer }, 2163 { SNDRV_SEQ_IOCTL_SET_QUEUE_TIMER, snd_seq_ioctl_set_queue_timer }, 2164 { SNDRV_SEQ_IOCTL_GET_QUEUE_CLIENT, snd_seq_ioctl_get_queue_client }, 2165 { SNDRV_SEQ_IOCTL_SET_QUEUE_CLIENT, snd_seq_ioctl_set_queue_client }, 2166 { SNDRV_SEQ_IOCTL_GET_CLIENT_POOL, snd_seq_ioctl_get_client_pool }, 2167 { SNDRV_SEQ_IOCTL_SET_CLIENT_POOL, snd_seq_ioctl_set_client_pool }, 2168 { SNDRV_SEQ_IOCTL_GET_SUBSCRIPTION, snd_seq_ioctl_get_subscription }, 2169 { SNDRV_SEQ_IOCTL_QUERY_NEXT_CLIENT, snd_seq_ioctl_query_next_client }, 2170 { SNDRV_SEQ_IOCTL_QUERY_NEXT_PORT, snd_seq_ioctl_query_next_port }, 2171 { SNDRV_SEQ_IOCTL_REMOVE_EVENTS, snd_seq_ioctl_remove_events }, 2172 { SNDRV_SEQ_IOCTL_QUERY_SUBS, snd_seq_ioctl_query_subs }, 2173 { 0, NULL }, 2174 }; 2175 2176 static int snd_seq_do_ioctl(struct snd_seq_client *client, unsigned int cmd, 2177 void __user *arg) 2178 { 2179 struct seq_ioctl_table *p; 2180 2181 switch (cmd) { 2182 case SNDRV_SEQ_IOCTL_PVERSION: 2183 /* return sequencer version number */ 2184 return put_user(SNDRV_SEQ_VERSION, (int __user *)arg) ? -EFAULT : 0; 2185 case SNDRV_SEQ_IOCTL_CLIENT_ID: 2186 /* return the id of this client */ 2187 return put_user(client->number, (int __user *)arg) ? -EFAULT : 0; 2188 } 2189 2190 if (! arg) 2191 return -EFAULT; 2192 for (p = ioctl_tables; p->cmd; p++) { 2193 if (p->cmd == cmd) 2194 return p->func(client, arg); 2195 } 2196 snd_printd("seq unknown ioctl() 0x%x (type='%c', number=0x%2x)\n", 2197 cmd, _IOC_TYPE(cmd), _IOC_NR(cmd)); 2198 return -ENOTTY; 2199 } 2200 2201 2202 static long snd_seq_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 2203 { 2204 struct snd_seq_client *client = file->private_data; 2205 2206 snd_assert(client != NULL, return -ENXIO); 2207 2208 return snd_seq_do_ioctl(client, cmd, (void __user *) arg); 2209 } 2210 2211 #ifdef CONFIG_COMPAT 2212 #include "seq_compat.c" 2213 #else 2214 #define snd_seq_ioctl_compat NULL 2215 #endif 2216 2217 /* -------------------------------------------------------- */ 2218 2219 2220 /* exported to kernel modules */ 2221 int snd_seq_create_kernel_client(struct snd_card *card, int client_index, 2222 const char *name_fmt, ...) 2223 { 2224 struct snd_seq_client *client; 2225 va_list args; 2226 2227 snd_assert(! in_interrupt(), return -EBUSY); 2228 2229 if (card && client_index >= SNDRV_SEQ_CLIENTS_PER_CARD) 2230 return -EINVAL; 2231 if (card == NULL && client_index >= SNDRV_SEQ_GLOBAL_CLIENTS) 2232 return -EINVAL; 2233 2234 if (mutex_lock_interruptible(®ister_mutex)) 2235 return -ERESTARTSYS; 2236 2237 if (card) { 2238 client_index += SNDRV_SEQ_GLOBAL_CLIENTS 2239 + card->number * SNDRV_SEQ_CLIENTS_PER_CARD; 2240 if (client_index >= SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN) 2241 client_index = -1; 2242 } 2243 2244 /* empty write queue as default */ 2245 client = seq_create_client1(client_index, 0); 2246 if (client == NULL) { 2247 mutex_unlock(®ister_mutex); 2248 return -EBUSY; /* failure code */ 2249 } 2250 usage_alloc(&client_usage, 1); 2251 2252 client->accept_input = 1; 2253 client->accept_output = 1; 2254 2255 va_start(args, name_fmt); 2256 vsnprintf(client->name, sizeof(client->name), name_fmt, args); 2257 va_end(args); 2258 2259 client->type = KERNEL_CLIENT; 2260 mutex_unlock(®ister_mutex); 2261 2262 /* make others aware this new client */ 2263 snd_seq_system_client_ev_client_start(client->number); 2264 2265 /* return client number to caller */ 2266 return client->number; 2267 } 2268 2269 EXPORT_SYMBOL(snd_seq_create_kernel_client); 2270 2271 /* exported to kernel modules */ 2272 int snd_seq_delete_kernel_client(int client) 2273 { 2274 struct snd_seq_client *ptr; 2275 2276 snd_assert(! in_interrupt(), return -EBUSY); 2277 2278 ptr = clientptr(client); 2279 if (ptr == NULL) 2280 return -EINVAL; 2281 2282 seq_free_client(ptr); 2283 kfree(ptr); 2284 return 0; 2285 } 2286 2287 EXPORT_SYMBOL(snd_seq_delete_kernel_client); 2288 2289 /* skeleton to enqueue event, called from snd_seq_kernel_client_enqueue 2290 * and snd_seq_kernel_client_enqueue_blocking 2291 */ 2292 static int kernel_client_enqueue(int client, struct snd_seq_event *ev, 2293 struct file *file, int blocking, 2294 int atomic, int hop) 2295 { 2296 struct snd_seq_client *cptr; 2297 int result; 2298 2299 snd_assert(ev != NULL, return -EINVAL); 2300 2301 if (ev->type == SNDRV_SEQ_EVENT_NONE) 2302 return 0; /* ignore this */ 2303 if (ev->type == SNDRV_SEQ_EVENT_KERNEL_ERROR) 2304 return -EINVAL; /* quoted events can't be enqueued */ 2305 2306 /* fill in client number */ 2307 ev->source.client = client; 2308 2309 if (check_event_type_and_length(ev)) 2310 return -EINVAL; 2311 2312 cptr = snd_seq_client_use_ptr(client); 2313 if (cptr == NULL) 2314 return -EINVAL; 2315 2316 if (! cptr->accept_output) 2317 result = -EPERM; 2318 else /* send it */ 2319 result = snd_seq_client_enqueue_event(cptr, ev, file, blocking, atomic, hop); 2320 2321 snd_seq_client_unlock(cptr); 2322 return result; 2323 } 2324 2325 /* 2326 * exported, called by kernel clients to enqueue events (w/o blocking) 2327 * 2328 * RETURN VALUE: zero if succeed, negative if error 2329 */ 2330 int snd_seq_kernel_client_enqueue(int client, struct snd_seq_event * ev, 2331 int atomic, int hop) 2332 { 2333 return kernel_client_enqueue(client, ev, NULL, 0, atomic, hop); 2334 } 2335 2336 EXPORT_SYMBOL(snd_seq_kernel_client_enqueue); 2337 2338 /* 2339 * exported, called by kernel clients to enqueue events (with blocking) 2340 * 2341 * RETURN VALUE: zero if succeed, negative if error 2342 */ 2343 int snd_seq_kernel_client_enqueue_blocking(int client, struct snd_seq_event * ev, 2344 struct file *file, 2345 int atomic, int hop) 2346 { 2347 return kernel_client_enqueue(client, ev, file, 1, atomic, hop); 2348 } 2349 2350 EXPORT_SYMBOL(snd_seq_kernel_client_enqueue_blocking); 2351 2352 /* 2353 * exported, called by kernel clients to dispatch events directly to other 2354 * clients, bypassing the queues. Event time-stamp will be updated. 2355 * 2356 * RETURN VALUE: negative = delivery failed, 2357 * zero, or positive: the number of delivered events 2358 */ 2359 int snd_seq_kernel_client_dispatch(int client, struct snd_seq_event * ev, 2360 int atomic, int hop) 2361 { 2362 struct snd_seq_client *cptr; 2363 int result; 2364 2365 snd_assert(ev != NULL, return -EINVAL); 2366 2367 /* fill in client number */ 2368 ev->queue = SNDRV_SEQ_QUEUE_DIRECT; 2369 ev->source.client = client; 2370 2371 if (check_event_type_and_length(ev)) 2372 return -EINVAL; 2373 2374 cptr = snd_seq_client_use_ptr(client); 2375 if (cptr == NULL) 2376 return -EINVAL; 2377 2378 if (!cptr->accept_output) 2379 result = -EPERM; 2380 else 2381 result = snd_seq_deliver_event(cptr, ev, atomic, hop); 2382 2383 snd_seq_client_unlock(cptr); 2384 return result; 2385 } 2386 2387 EXPORT_SYMBOL(snd_seq_kernel_client_dispatch); 2388 2389 /* 2390 * exported, called by kernel clients to perform same functions as with 2391 * userland ioctl() 2392 */ 2393 int snd_seq_kernel_client_ctl(int clientid, unsigned int cmd, void *arg) 2394 { 2395 struct snd_seq_client *client; 2396 mm_segment_t fs; 2397 int result; 2398 2399 client = clientptr(clientid); 2400 if (client == NULL) 2401 return -ENXIO; 2402 fs = snd_enter_user(); 2403 result = snd_seq_do_ioctl(client, cmd, (void __user *)arg); 2404 snd_leave_user(fs); 2405 return result; 2406 } 2407 2408 EXPORT_SYMBOL(snd_seq_kernel_client_ctl); 2409 2410 /* exported (for OSS emulator) */ 2411 int snd_seq_kernel_client_write_poll(int clientid, struct file *file, poll_table *wait) 2412 { 2413 struct snd_seq_client *client; 2414 2415 client = clientptr(clientid); 2416 if (client == NULL) 2417 return -ENXIO; 2418 2419 if (! snd_seq_write_pool_allocated(client)) 2420 return 1; 2421 if (snd_seq_pool_poll_wait(client->pool, file, wait)) 2422 return 1; 2423 return 0; 2424 } 2425 2426 EXPORT_SYMBOL(snd_seq_kernel_client_write_poll); 2427 2428 /*---------------------------------------------------------------------------*/ 2429 2430 #ifdef CONFIG_PROC_FS 2431 /* 2432 * /proc interface 2433 */ 2434 static void snd_seq_info_dump_subscribers(struct snd_info_buffer *buffer, 2435 struct snd_seq_port_subs_info *group, 2436 int is_src, char *msg) 2437 { 2438 struct list_head *p; 2439 struct snd_seq_subscribers *s; 2440 int count = 0; 2441 2442 down_read(&group->list_mutex); 2443 if (list_empty(&group->list_head)) { 2444 up_read(&group->list_mutex); 2445 return; 2446 } 2447 snd_iprintf(buffer, msg); 2448 list_for_each(p, &group->list_head) { 2449 if (is_src) 2450 s = list_entry(p, struct snd_seq_subscribers, src_list); 2451 else 2452 s = list_entry(p, struct snd_seq_subscribers, dest_list); 2453 if (count++) 2454 snd_iprintf(buffer, ", "); 2455 snd_iprintf(buffer, "%d:%d", 2456 is_src ? s->info.dest.client : s->info.sender.client, 2457 is_src ? s->info.dest.port : s->info.sender.port); 2458 if (s->info.flags & SNDRV_SEQ_PORT_SUBS_TIMESTAMP) 2459 snd_iprintf(buffer, "[%c:%d]", ((s->info.flags & SNDRV_SEQ_PORT_SUBS_TIME_REAL) ? 'r' : 't'), s->info.queue); 2460 if (group->exclusive) 2461 snd_iprintf(buffer, "[ex]"); 2462 } 2463 up_read(&group->list_mutex); 2464 snd_iprintf(buffer, "\n"); 2465 } 2466 2467 #define FLAG_PERM_RD(perm) ((perm) & SNDRV_SEQ_PORT_CAP_READ ? ((perm) & SNDRV_SEQ_PORT_CAP_SUBS_READ ? 'R' : 'r') : '-') 2468 #define FLAG_PERM_WR(perm) ((perm) & SNDRV_SEQ_PORT_CAP_WRITE ? ((perm) & SNDRV_SEQ_PORT_CAP_SUBS_WRITE ? 'W' : 'w') : '-') 2469 #define FLAG_PERM_EX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_NO_EXPORT ? '-' : 'e') 2470 2471 #define FLAG_PERM_DUPLEX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_DUPLEX ? 'X' : '-') 2472 2473 static void snd_seq_info_dump_ports(struct snd_info_buffer *buffer, 2474 struct snd_seq_client *client) 2475 { 2476 struct list_head *l; 2477 2478 mutex_lock(&client->ports_mutex); 2479 list_for_each(l, &client->ports_list_head) { 2480 struct snd_seq_client_port *p = list_entry(l, struct snd_seq_client_port, list); 2481 snd_iprintf(buffer, " Port %3d : \"%s\" (%c%c%c%c)\n", 2482 p->addr.port, p->name, 2483 FLAG_PERM_RD(p->capability), 2484 FLAG_PERM_WR(p->capability), 2485 FLAG_PERM_EX(p->capability), 2486 FLAG_PERM_DUPLEX(p->capability)); 2487 snd_seq_info_dump_subscribers(buffer, &p->c_src, 1, " Connecting To: "); 2488 snd_seq_info_dump_subscribers(buffer, &p->c_dest, 0, " Connected From: "); 2489 } 2490 mutex_unlock(&client->ports_mutex); 2491 } 2492 2493 2494 void snd_seq_info_pool(struct snd_info_buffer *buffer, 2495 struct snd_seq_pool *pool, char *space); 2496 2497 /* exported to seq_info.c */ 2498 void snd_seq_info_clients_read(struct snd_info_entry *entry, 2499 struct snd_info_buffer *buffer) 2500 { 2501 int c; 2502 struct snd_seq_client *client; 2503 2504 snd_iprintf(buffer, "Client info\n"); 2505 snd_iprintf(buffer, " cur clients : %d\n", client_usage.cur); 2506 snd_iprintf(buffer, " peak clients : %d\n", client_usage.peak); 2507 snd_iprintf(buffer, " max clients : %d\n", SNDRV_SEQ_MAX_CLIENTS); 2508 snd_iprintf(buffer, "\n"); 2509 2510 /* list the client table */ 2511 for (c = 0; c < SNDRV_SEQ_MAX_CLIENTS; c++) { 2512 client = snd_seq_client_use_ptr(c); 2513 if (client == NULL) 2514 continue; 2515 if (client->type == NO_CLIENT) { 2516 snd_seq_client_unlock(client); 2517 continue; 2518 } 2519 2520 snd_iprintf(buffer, "Client %3d : \"%s\" [%s]\n", 2521 c, client->name, 2522 client->type == USER_CLIENT ? "User" : "Kernel"); 2523 snd_seq_info_dump_ports(buffer, client); 2524 if (snd_seq_write_pool_allocated(client)) { 2525 snd_iprintf(buffer, " Output pool :\n"); 2526 snd_seq_info_pool(buffer, client->pool, " "); 2527 } 2528 if (client->type == USER_CLIENT && client->data.user.fifo && 2529 client->data.user.fifo->pool) { 2530 snd_iprintf(buffer, " Input pool :\n"); 2531 snd_seq_info_pool(buffer, client->data.user.fifo->pool, " "); 2532 } 2533 snd_seq_client_unlock(client); 2534 } 2535 } 2536 #endif /* CONFIG_PROC_FS */ 2537 2538 /*---------------------------------------------------------------------------*/ 2539 2540 2541 /* 2542 * REGISTRATION PART 2543 */ 2544 2545 static struct file_operations snd_seq_f_ops = 2546 { 2547 .owner = THIS_MODULE, 2548 .read = snd_seq_read, 2549 .write = snd_seq_write, 2550 .open = snd_seq_open, 2551 .release = snd_seq_release, 2552 .poll = snd_seq_poll, 2553 .unlocked_ioctl = snd_seq_ioctl, 2554 .compat_ioctl = snd_seq_ioctl_compat, 2555 }; 2556 2557 /* 2558 * register sequencer device 2559 */ 2560 int __init snd_sequencer_device_init(void) 2561 { 2562 int err; 2563 2564 if (mutex_lock_interruptible(®ister_mutex)) 2565 return -ERESTARTSYS; 2566 2567 if ((err = snd_register_device(SNDRV_DEVICE_TYPE_SEQUENCER, NULL, 0, 2568 &snd_seq_f_ops, NULL, "seq")) < 0) { 2569 mutex_unlock(®ister_mutex); 2570 return err; 2571 } 2572 2573 mutex_unlock(®ister_mutex); 2574 2575 return 0; 2576 } 2577 2578 2579 2580 /* 2581 * unregister sequencer device 2582 */ 2583 void __exit snd_sequencer_device_done(void) 2584 { 2585 snd_unregister_device(SNDRV_DEVICE_TYPE_SEQUENCER, NULL, 0); 2586 } 2587