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/slab.h> 26 #include <sound/core.h> 27 #include <sound/minors.h> 28 #include <linux/kmod.h> 29 30 #include <sound/seq_kernel.h> 31 #include "seq_clientmgr.h" 32 #include "seq_memory.h" 33 #include "seq_queue.h" 34 #include "seq_timer.h" 35 #include "seq_info.h" 36 #include "seq_system.h" 37 #include <sound/seq_device.h> 38 #ifdef CONFIG_COMPAT 39 #include <linux/compat.h> 40 #endif 41 42 /* Client Manager 43 44 * this module handles the connections of userland and kernel clients 45 * 46 */ 47 48 /* 49 * There are four ranges of client numbers (last two shared): 50 * 0..15: global clients 51 * 16..127: statically allocated client numbers for cards 0..27 52 * 128..191: dynamically allocated client numbers for cards 28..31 53 * 128..191: dynamically allocated client numbers for applications 54 */ 55 56 /* number of kernel non-card clients */ 57 #define SNDRV_SEQ_GLOBAL_CLIENTS 16 58 /* clients per cards, for static clients */ 59 #define SNDRV_SEQ_CLIENTS_PER_CARD 4 60 /* dynamically allocated client numbers (both kernel drivers and user space) */ 61 #define SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN 128 62 63 #define SNDRV_SEQ_LFLG_INPUT 0x0001 64 #define SNDRV_SEQ_LFLG_OUTPUT 0x0002 65 #define SNDRV_SEQ_LFLG_OPEN (SNDRV_SEQ_LFLG_INPUT|SNDRV_SEQ_LFLG_OUTPUT) 66 67 static DEFINE_SPINLOCK(clients_lock); 68 static DEFINE_MUTEX(register_mutex); 69 70 /* 71 * client table 72 */ 73 static char clienttablock[SNDRV_SEQ_MAX_CLIENTS]; 74 static struct snd_seq_client *clienttab[SNDRV_SEQ_MAX_CLIENTS]; 75 static struct snd_seq_usage client_usage; 76 77 /* 78 * prototypes 79 */ 80 static int bounce_error_event(struct snd_seq_client *client, 81 struct snd_seq_event *event, 82 int err, int atomic, int hop); 83 static int snd_seq_deliver_single_event(struct snd_seq_client *client, 84 struct snd_seq_event *event, 85 int filter, int atomic, int hop); 86 87 /* 88 */ 89 90 static inline mm_segment_t snd_enter_user(void) 91 { 92 mm_segment_t fs = get_fs(); 93 set_fs(get_ds()); 94 return fs; 95 } 96 97 static inline void snd_leave_user(mm_segment_t fs) 98 { 99 set_fs(fs); 100 } 101 102 /* 103 */ 104 static inline unsigned short snd_seq_file_flags(struct file *file) 105 { 106 switch (file->f_mode & (FMODE_READ | FMODE_WRITE)) { 107 case FMODE_WRITE: 108 return SNDRV_SEQ_LFLG_OUTPUT; 109 case FMODE_READ: 110 return SNDRV_SEQ_LFLG_INPUT; 111 default: 112 return SNDRV_SEQ_LFLG_OPEN; 113 } 114 } 115 116 static inline int snd_seq_write_pool_allocated(struct snd_seq_client *client) 117 { 118 return snd_seq_total_cells(client->pool) > 0; 119 } 120 121 /* return pointer to client structure for specified id */ 122 static struct snd_seq_client *clientptr(int clientid) 123 { 124 if (clientid < 0 || clientid >= SNDRV_SEQ_MAX_CLIENTS) { 125 snd_printd("Seq: oops. Trying to get pointer to client %d\n", 126 clientid); 127 return NULL; 128 } 129 return clienttab[clientid]; 130 } 131 132 struct snd_seq_client *snd_seq_client_use_ptr(int clientid) 133 { 134 unsigned long flags; 135 struct snd_seq_client *client; 136 137 if (clientid < 0 || clientid >= SNDRV_SEQ_MAX_CLIENTS) { 138 snd_printd("Seq: oops. Trying to get pointer to client %d\n", 139 clientid); 140 return NULL; 141 } 142 spin_lock_irqsave(&clients_lock, flags); 143 client = clientptr(clientid); 144 if (client) 145 goto __lock; 146 if (clienttablock[clientid]) { 147 spin_unlock_irqrestore(&clients_lock, flags); 148 return NULL; 149 } 150 spin_unlock_irqrestore(&clients_lock, flags); 151 #ifdef CONFIG_MODULES 152 if (!in_interrupt()) { 153 static char client_requested[SNDRV_SEQ_GLOBAL_CLIENTS]; 154 static char card_requested[SNDRV_CARDS]; 155 if (clientid < SNDRV_SEQ_GLOBAL_CLIENTS) { 156 int idx; 157 158 if (!client_requested[clientid]) { 159 client_requested[clientid] = 1; 160 for (idx = 0; idx < 15; idx++) { 161 if (seq_client_load[idx] < 0) 162 break; 163 if (seq_client_load[idx] == clientid) { 164 request_module("snd-seq-client-%i", 165 clientid); 166 break; 167 } 168 } 169 } 170 } else if (clientid < SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN) { 171 int card = (clientid - SNDRV_SEQ_GLOBAL_CLIENTS) / 172 SNDRV_SEQ_CLIENTS_PER_CARD; 173 if (card < snd_ecards_limit) { 174 if (! card_requested[card]) { 175 card_requested[card] = 1; 176 snd_request_card(card); 177 } 178 snd_seq_device_load_drivers(); 179 } 180 } 181 spin_lock_irqsave(&clients_lock, flags); 182 client = clientptr(clientid); 183 if (client) 184 goto __lock; 185 spin_unlock_irqrestore(&clients_lock, flags); 186 } 187 #endif 188 return NULL; 189 190 __lock: 191 snd_use_lock_use(&client->use_lock); 192 spin_unlock_irqrestore(&clients_lock, flags); 193 return client; 194 } 195 196 static void usage_alloc(struct snd_seq_usage *res, int num) 197 { 198 res->cur += num; 199 if (res->cur > res->peak) 200 res->peak = res->cur; 201 } 202 203 static void usage_free(struct snd_seq_usage *res, int num) 204 { 205 res->cur -= num; 206 } 207 208 /* initialise data structures */ 209 int __init client_init_data(void) 210 { 211 /* zap out the client table */ 212 memset(&clienttablock, 0, sizeof(clienttablock)); 213 memset(&clienttab, 0, sizeof(clienttab)); 214 return 0; 215 } 216 217 218 static struct snd_seq_client *seq_create_client1(int client_index, int poolsize) 219 { 220 unsigned long flags; 221 int c; 222 struct snd_seq_client *client; 223 224 /* init client data */ 225 client = kzalloc(sizeof(*client), GFP_KERNEL); 226 if (client == NULL) 227 return NULL; 228 client->pool = snd_seq_pool_new(poolsize); 229 if (client->pool == NULL) { 230 kfree(client); 231 return NULL; 232 } 233 client->type = NO_CLIENT; 234 snd_use_lock_init(&client->use_lock); 235 rwlock_init(&client->ports_lock); 236 mutex_init(&client->ports_mutex); 237 INIT_LIST_HEAD(&client->ports_list_head); 238 239 /* find free slot in the client table */ 240 spin_lock_irqsave(&clients_lock, flags); 241 if (client_index < 0) { 242 for (c = SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN; 243 c < SNDRV_SEQ_MAX_CLIENTS; 244 c++) { 245 if (clienttab[c] || clienttablock[c]) 246 continue; 247 clienttab[client->number = c] = client; 248 spin_unlock_irqrestore(&clients_lock, flags); 249 return client; 250 } 251 } else { 252 if (clienttab[client_index] == NULL && !clienttablock[client_index]) { 253 clienttab[client->number = client_index] = client; 254 spin_unlock_irqrestore(&clients_lock, flags); 255 return client; 256 } 257 } 258 spin_unlock_irqrestore(&clients_lock, flags); 259 snd_seq_pool_delete(&client->pool); 260 kfree(client); 261 return NULL; /* no free slot found or busy, return failure code */ 262 } 263 264 265 static int seq_free_client1(struct snd_seq_client *client) 266 { 267 unsigned long flags; 268 269 if (!client) 270 return 0; 271 snd_seq_delete_all_ports(client); 272 snd_seq_queue_client_leave(client->number); 273 spin_lock_irqsave(&clients_lock, flags); 274 clienttablock[client->number] = 1; 275 clienttab[client->number] = NULL; 276 spin_unlock_irqrestore(&clients_lock, flags); 277 snd_use_lock_sync(&client->use_lock); 278 snd_seq_queue_client_termination(client->number); 279 if (client->pool) 280 snd_seq_pool_delete(&client->pool); 281 spin_lock_irqsave(&clients_lock, flags); 282 clienttablock[client->number] = 0; 283 spin_unlock_irqrestore(&clients_lock, flags); 284 return 0; 285 } 286 287 288 static void seq_free_client(struct snd_seq_client * client) 289 { 290 mutex_lock(®ister_mutex); 291 switch (client->type) { 292 case NO_CLIENT: 293 snd_printk(KERN_WARNING "Seq: Trying to free unused client %d\n", 294 client->number); 295 break; 296 case USER_CLIENT: 297 case KERNEL_CLIENT: 298 seq_free_client1(client); 299 usage_free(&client_usage, 1); 300 break; 301 302 default: 303 snd_printk(KERN_ERR "Seq: Trying to free client %d with undefined type = %d\n", 304 client->number, client->type); 305 } 306 mutex_unlock(®ister_mutex); 307 308 snd_seq_system_client_ev_client_exit(client->number); 309 } 310 311 312 313 /* -------------------------------------------------------- */ 314 315 /* create a user client */ 316 static int snd_seq_open(struct inode *inode, struct file *file) 317 { 318 int c, mode; /* client id */ 319 struct snd_seq_client *client; 320 struct snd_seq_user_client *user; 321 int err; 322 323 err = nonseekable_open(inode, file); 324 if (err < 0) 325 return err; 326 327 if (mutex_lock_interruptible(®ister_mutex)) 328 return -ERESTARTSYS; 329 client = seq_create_client1(-1, SNDRV_SEQ_DEFAULT_EVENTS); 330 if (client == NULL) { 331 mutex_unlock(®ister_mutex); 332 return -ENOMEM; /* failure code */ 333 } 334 335 mode = snd_seq_file_flags(file); 336 if (mode & SNDRV_SEQ_LFLG_INPUT) 337 client->accept_input = 1; 338 if (mode & SNDRV_SEQ_LFLG_OUTPUT) 339 client->accept_output = 1; 340 341 user = &client->data.user; 342 user->fifo = NULL; 343 user->fifo_pool_size = 0; 344 345 if (mode & SNDRV_SEQ_LFLG_INPUT) { 346 user->fifo_pool_size = SNDRV_SEQ_DEFAULT_CLIENT_EVENTS; 347 user->fifo = snd_seq_fifo_new(user->fifo_pool_size); 348 if (user->fifo == NULL) { 349 seq_free_client1(client); 350 kfree(client); 351 mutex_unlock(®ister_mutex); 352 return -ENOMEM; 353 } 354 } 355 356 usage_alloc(&client_usage, 1); 357 client->type = USER_CLIENT; 358 mutex_unlock(®ister_mutex); 359 360 c = client->number; 361 file->private_data = client; 362 363 /* fill client data */ 364 user->file = file; 365 sprintf(client->name, "Client-%d", c); 366 367 /* make others aware this new client */ 368 snd_seq_system_client_ev_client_start(c); 369 370 return 0; 371 } 372 373 /* delete a user client */ 374 static int snd_seq_release(struct inode *inode, struct file *file) 375 { 376 struct snd_seq_client *client = file->private_data; 377 378 if (client) { 379 seq_free_client(client); 380 if (client->data.user.fifo) 381 snd_seq_fifo_delete(&client->data.user.fifo); 382 kfree(client); 383 } 384 385 return 0; 386 } 387 388 389 /* handle client read() */ 390 /* possible error values: 391 * -ENXIO invalid client or file open mode 392 * -ENOSPC FIFO overflow (the flag is cleared after this error report) 393 * -EINVAL no enough user-space buffer to write the whole event 394 * -EFAULT seg. fault during copy to user space 395 */ 396 static ssize_t snd_seq_read(struct file *file, char __user *buf, size_t count, 397 loff_t *offset) 398 { 399 struct snd_seq_client *client = file->private_data; 400 struct snd_seq_fifo *fifo; 401 int err; 402 long result = 0; 403 struct snd_seq_event_cell *cell; 404 405 if (!(snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_INPUT)) 406 return -ENXIO; 407 408 if (!access_ok(VERIFY_WRITE, buf, count)) 409 return -EFAULT; 410 411 /* check client structures are in place */ 412 if (snd_BUG_ON(!client)) 413 return -ENXIO; 414 415 if (!client->accept_input || (fifo = client->data.user.fifo) == NULL) 416 return -ENXIO; 417 418 if (atomic_read(&fifo->overflow) > 0) { 419 /* buffer overflow is detected */ 420 snd_seq_fifo_clear(fifo); 421 /* return error code */ 422 return -ENOSPC; 423 } 424 425 cell = NULL; 426 err = 0; 427 snd_seq_fifo_lock(fifo); 428 429 /* while data available in queue */ 430 while (count >= sizeof(struct snd_seq_event)) { 431 int nonblock; 432 433 nonblock = (file->f_flags & O_NONBLOCK) || result > 0; 434 if ((err = snd_seq_fifo_cell_out(fifo, &cell, nonblock)) < 0) { 435 break; 436 } 437 if (snd_seq_ev_is_variable(&cell->event)) { 438 struct snd_seq_event tmpev; 439 tmpev = cell->event; 440 tmpev.data.ext.len &= ~SNDRV_SEQ_EXT_MASK; 441 if (copy_to_user(buf, &tmpev, sizeof(struct snd_seq_event))) { 442 err = -EFAULT; 443 break; 444 } 445 count -= sizeof(struct snd_seq_event); 446 buf += sizeof(struct snd_seq_event); 447 err = snd_seq_expand_var_event(&cell->event, count, 448 (char __force *)buf, 0, 449 sizeof(struct snd_seq_event)); 450 if (err < 0) 451 break; 452 result += err; 453 count -= err; 454 buf += err; 455 } else { 456 if (copy_to_user(buf, &cell->event, sizeof(struct snd_seq_event))) { 457 err = -EFAULT; 458 break; 459 } 460 count -= sizeof(struct snd_seq_event); 461 buf += sizeof(struct snd_seq_event); 462 } 463 snd_seq_cell_free(cell); 464 cell = NULL; /* to be sure */ 465 result += sizeof(struct snd_seq_event); 466 } 467 468 if (err < 0) { 469 if (cell) 470 snd_seq_fifo_cell_putback(fifo, cell); 471 if (err == -EAGAIN && result > 0) 472 err = 0; 473 } 474 snd_seq_fifo_unlock(fifo); 475 476 return (err < 0) ? err : result; 477 } 478 479 480 /* 481 * check access permission to the port 482 */ 483 static int check_port_perm(struct snd_seq_client_port *port, unsigned int flags) 484 { 485 if ((port->capability & flags) != flags) 486 return 0; 487 return flags; 488 } 489 490 /* 491 * check if the destination client is available, and return the pointer 492 * if filter is non-zero, client filter bitmap is tested. 493 */ 494 static struct snd_seq_client *get_event_dest_client(struct snd_seq_event *event, 495 int filter) 496 { 497 struct snd_seq_client *dest; 498 499 dest = snd_seq_client_use_ptr(event->dest.client); 500 if (dest == NULL) 501 return NULL; 502 if (! dest->accept_input) 503 goto __not_avail; 504 if ((dest->filter & SNDRV_SEQ_FILTER_USE_EVENT) && 505 ! test_bit(event->type, dest->event_filter)) 506 goto __not_avail; 507 if (filter && !(dest->filter & filter)) 508 goto __not_avail; 509 510 return dest; /* ok - accessible */ 511 __not_avail: 512 snd_seq_client_unlock(dest); 513 return NULL; 514 } 515 516 517 /* 518 * Return the error event. 519 * 520 * If the receiver client is a user client, the original event is 521 * encapsulated in SNDRV_SEQ_EVENT_BOUNCE as variable length event. If 522 * the original event is also variable length, the external data is 523 * copied after the event record. 524 * If the receiver client is a kernel client, the original event is 525 * quoted in SNDRV_SEQ_EVENT_KERNEL_ERROR, since this requires no extra 526 * kmalloc. 527 */ 528 static int bounce_error_event(struct snd_seq_client *client, 529 struct snd_seq_event *event, 530 int err, int atomic, int hop) 531 { 532 struct snd_seq_event bounce_ev; 533 int result; 534 535 if (client == NULL || 536 ! (client->filter & SNDRV_SEQ_FILTER_BOUNCE) || 537 ! client->accept_input) 538 return 0; /* ignored */ 539 540 /* set up quoted error */ 541 memset(&bounce_ev, 0, sizeof(bounce_ev)); 542 bounce_ev.type = SNDRV_SEQ_EVENT_KERNEL_ERROR; 543 bounce_ev.flags = SNDRV_SEQ_EVENT_LENGTH_FIXED; 544 bounce_ev.queue = SNDRV_SEQ_QUEUE_DIRECT; 545 bounce_ev.source.client = SNDRV_SEQ_CLIENT_SYSTEM; 546 bounce_ev.source.port = SNDRV_SEQ_PORT_SYSTEM_ANNOUNCE; 547 bounce_ev.dest.client = client->number; 548 bounce_ev.dest.port = event->source.port; 549 bounce_ev.data.quote.origin = event->dest; 550 bounce_ev.data.quote.event = event; 551 bounce_ev.data.quote.value = -err; /* use positive value */ 552 result = snd_seq_deliver_single_event(NULL, &bounce_ev, 0, atomic, hop + 1); 553 if (result < 0) { 554 client->event_lost++; 555 return result; 556 } 557 558 return result; 559 } 560 561 562 /* 563 * rewrite the time-stamp of the event record with the curren time 564 * of the given queue. 565 * return non-zero if updated. 566 */ 567 static int update_timestamp_of_queue(struct snd_seq_event *event, 568 int queue, int real_time) 569 { 570 struct snd_seq_queue *q; 571 572 q = queueptr(queue); 573 if (! q) 574 return 0; 575 event->queue = queue; 576 event->flags &= ~SNDRV_SEQ_TIME_STAMP_MASK; 577 if (real_time) { 578 event->time.time = snd_seq_timer_get_cur_time(q->timer); 579 event->flags |= SNDRV_SEQ_TIME_STAMP_REAL; 580 } else { 581 event->time.tick = snd_seq_timer_get_cur_tick(q->timer); 582 event->flags |= SNDRV_SEQ_TIME_STAMP_TICK; 583 } 584 queuefree(q); 585 return 1; 586 } 587 588 589 /* 590 * deliver an event to the specified destination. 591 * if filter is non-zero, client filter bitmap is tested. 592 * 593 * RETURN VALUE: 0 : if succeeded 594 * <0 : error 595 */ 596 static int snd_seq_deliver_single_event(struct snd_seq_client *client, 597 struct snd_seq_event *event, 598 int filter, int atomic, int hop) 599 { 600 struct snd_seq_client *dest = NULL; 601 struct snd_seq_client_port *dest_port = NULL; 602 int result = -ENOENT; 603 int direct; 604 605 direct = snd_seq_ev_is_direct(event); 606 607 dest = get_event_dest_client(event, filter); 608 if (dest == NULL) 609 goto __skip; 610 dest_port = snd_seq_port_use_ptr(dest, event->dest.port); 611 if (dest_port == NULL) 612 goto __skip; 613 614 /* check permission */ 615 if (! check_port_perm(dest_port, SNDRV_SEQ_PORT_CAP_WRITE)) { 616 result = -EPERM; 617 goto __skip; 618 } 619 620 if (dest_port->timestamping) 621 update_timestamp_of_queue(event, dest_port->time_queue, 622 dest_port->time_real); 623 624 switch (dest->type) { 625 case USER_CLIENT: 626 if (dest->data.user.fifo) 627 result = snd_seq_fifo_event_in(dest->data.user.fifo, event); 628 break; 629 630 case KERNEL_CLIENT: 631 if (dest_port->event_input == NULL) 632 break; 633 result = dest_port->event_input(event, direct, 634 dest_port->private_data, 635 atomic, hop); 636 break; 637 default: 638 break; 639 } 640 641 __skip: 642 if (dest_port) 643 snd_seq_port_unlock(dest_port); 644 if (dest) 645 snd_seq_client_unlock(dest); 646 647 if (result < 0 && !direct) { 648 result = bounce_error_event(client, event, result, atomic, hop); 649 } 650 return result; 651 } 652 653 654 /* 655 * send the event to all subscribers: 656 */ 657 static int deliver_to_subscribers(struct snd_seq_client *client, 658 struct snd_seq_event *event, 659 int atomic, int hop) 660 { 661 struct snd_seq_subscribers *subs; 662 int err = 0, num_ev = 0; 663 struct snd_seq_event event_saved; 664 struct snd_seq_client_port *src_port; 665 struct snd_seq_port_subs_info *grp; 666 667 src_port = snd_seq_port_use_ptr(client, event->source.port); 668 if (src_port == NULL) 669 return -EINVAL; /* invalid source port */ 670 /* save original event record */ 671 event_saved = *event; 672 grp = &src_port->c_src; 673 674 /* lock list */ 675 if (atomic) 676 read_lock(&grp->list_lock); 677 else 678 down_read(&grp->list_mutex); 679 list_for_each_entry(subs, &grp->list_head, src_list) { 680 event->dest = subs->info.dest; 681 if (subs->info.flags & SNDRV_SEQ_PORT_SUBS_TIMESTAMP) 682 /* convert time according to flag with subscription */ 683 update_timestamp_of_queue(event, subs->info.queue, 684 subs->info.flags & SNDRV_SEQ_PORT_SUBS_TIME_REAL); 685 err = snd_seq_deliver_single_event(client, event, 686 0, atomic, hop); 687 if (err < 0) 688 break; 689 num_ev++; 690 /* restore original event record */ 691 *event = event_saved; 692 } 693 if (atomic) 694 read_unlock(&grp->list_lock); 695 else 696 up_read(&grp->list_mutex); 697 *event = event_saved; /* restore */ 698 snd_seq_port_unlock(src_port); 699 return (err < 0) ? err : num_ev; 700 } 701 702 703 #ifdef SUPPORT_BROADCAST 704 /* 705 * broadcast to all ports: 706 */ 707 static int port_broadcast_event(struct snd_seq_client *client, 708 struct snd_seq_event *event, 709 int atomic, int hop) 710 { 711 int num_ev = 0, err = 0; 712 struct snd_seq_client *dest_client; 713 struct snd_seq_client_port *port; 714 715 dest_client = get_event_dest_client(event, SNDRV_SEQ_FILTER_BROADCAST); 716 if (dest_client == NULL) 717 return 0; /* no matching destination */ 718 719 read_lock(&dest_client->ports_lock); 720 list_for_each_entry(port, &dest_client->ports_list_head, 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 if (snd_BUG_ON(!cell)) 836 return -EINVAL; 837 838 client = snd_seq_client_use_ptr(cell->event.source.client); 839 if (client == NULL) { 840 snd_seq_cell_free(cell); /* release this cell */ 841 return -EINVAL; 842 } 843 844 if (cell->event.type == SNDRV_SEQ_EVENT_NOTE) { 845 /* NOTE event: 846 * the event cell is re-used as a NOTE-OFF event and 847 * enqueued again. 848 */ 849 struct snd_seq_event tmpev, *ev; 850 851 /* reserve this event to enqueue note-off later */ 852 tmpev = cell->event; 853 tmpev.type = SNDRV_SEQ_EVENT_NOTEON; 854 result = snd_seq_deliver_event(client, &tmpev, atomic, hop); 855 856 /* 857 * This was originally a note event. We now re-use the 858 * cell for the note-off event. 859 */ 860 861 ev = &cell->event; 862 ev->type = SNDRV_SEQ_EVENT_NOTEOFF; 863 ev->flags |= SNDRV_SEQ_PRIORITY_HIGH; 864 865 /* add the duration time */ 866 switch (ev->flags & SNDRV_SEQ_TIME_STAMP_MASK) { 867 case SNDRV_SEQ_TIME_STAMP_TICK: 868 ev->time.tick += ev->data.note.duration; 869 break; 870 case SNDRV_SEQ_TIME_STAMP_REAL: 871 /* unit for duration is ms */ 872 ev->time.time.tv_nsec += 1000000 * (ev->data.note.duration % 1000); 873 ev->time.time.tv_sec += ev->data.note.duration / 1000 + 874 ev->time.time.tv_nsec / 1000000000; 875 ev->time.time.tv_nsec %= 1000000000; 876 break; 877 } 878 ev->data.note.velocity = ev->data.note.off_velocity; 879 880 /* Now queue this cell as the note off event */ 881 if (snd_seq_enqueue_event(cell, atomic, hop) < 0) 882 snd_seq_cell_free(cell); /* release this cell */ 883 884 } else { 885 /* Normal events: 886 * event cell is freed after processing the event 887 */ 888 889 result = snd_seq_deliver_event(client, &cell->event, atomic, hop); 890 snd_seq_cell_free(cell); 891 } 892 893 snd_seq_client_unlock(client); 894 return result; 895 } 896 897 898 /* Allocate a cell from client pool and enqueue it to queue: 899 * if pool is empty and blocking is TRUE, sleep until a new cell is 900 * available. 901 */ 902 static int snd_seq_client_enqueue_event(struct snd_seq_client *client, 903 struct snd_seq_event *event, 904 struct file *file, int blocking, 905 int atomic, int hop) 906 { 907 struct snd_seq_event_cell *cell; 908 int err; 909 910 /* special queue values - force direct passing */ 911 if (event->queue == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) { 912 event->dest.client = SNDRV_SEQ_ADDRESS_SUBSCRIBERS; 913 event->queue = SNDRV_SEQ_QUEUE_DIRECT; 914 } else 915 #ifdef SUPPORT_BROADCAST 916 if (event->queue == SNDRV_SEQ_ADDRESS_BROADCAST) { 917 event->dest.client = SNDRV_SEQ_ADDRESS_BROADCAST; 918 event->queue = SNDRV_SEQ_QUEUE_DIRECT; 919 } 920 #endif 921 if (event->dest.client == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) { 922 /* check presence of source port */ 923 struct snd_seq_client_port *src_port = snd_seq_port_use_ptr(client, event->source.port); 924 if (src_port == NULL) 925 return -EINVAL; 926 snd_seq_port_unlock(src_port); 927 } 928 929 /* direct event processing without enqueued */ 930 if (snd_seq_ev_is_direct(event)) { 931 if (event->type == SNDRV_SEQ_EVENT_NOTE) 932 return -EINVAL; /* this event must be enqueued! */ 933 return snd_seq_deliver_event(client, event, atomic, hop); 934 } 935 936 /* Not direct, normal queuing */ 937 if (snd_seq_queue_is_used(event->queue, client->number) <= 0) 938 return -EINVAL; /* invalid queue */ 939 if (! snd_seq_write_pool_allocated(client)) 940 return -ENXIO; /* queue is not allocated */ 941 942 /* allocate an event cell */ 943 err = snd_seq_event_dup(client->pool, event, &cell, !blocking || atomic, file); 944 if (err < 0) 945 return err; 946 947 /* we got a cell. enqueue it. */ 948 if ((err = snd_seq_enqueue_event(cell, atomic, hop)) < 0) { 949 snd_seq_cell_free(cell); 950 return err; 951 } 952 953 return 0; 954 } 955 956 957 /* 958 * check validity of event type and data length. 959 * return non-zero if invalid. 960 */ 961 static int check_event_type_and_length(struct snd_seq_event *ev) 962 { 963 switch (snd_seq_ev_length_type(ev)) { 964 case SNDRV_SEQ_EVENT_LENGTH_FIXED: 965 if (snd_seq_ev_is_variable_type(ev)) 966 return -EINVAL; 967 break; 968 case SNDRV_SEQ_EVENT_LENGTH_VARIABLE: 969 if (! snd_seq_ev_is_variable_type(ev) || 970 (ev->data.ext.len & ~SNDRV_SEQ_EXT_MASK) >= SNDRV_SEQ_MAX_EVENT_LEN) 971 return -EINVAL; 972 break; 973 case SNDRV_SEQ_EVENT_LENGTH_VARUSR: 974 if (! 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 if (snd_BUG_ON(!client)) 1006 return -ENXIO; 1007 1008 if (!client->accept_output || client->pool == NULL) 1009 return -ENXIO; 1010 1011 /* allocate the pool now if the pool is not allocated yet */ 1012 if (client->pool->size > 0 && !snd_seq_write_pool_allocated(client)) { 1013 if (snd_seq_pool_init(client->pool) < 0) 1014 return -ENOMEM; 1015 } 1016 1017 /* only process whole events */ 1018 while (count >= sizeof(struct snd_seq_event)) { 1019 /* Read in the event header from the user */ 1020 len = sizeof(event); 1021 if (copy_from_user(&event, buf, len)) { 1022 err = -EFAULT; 1023 break; 1024 } 1025 event.source.client = client->number; /* fill in client number */ 1026 /* Check for extension data length */ 1027 if (check_event_type_and_length(&event)) { 1028 err = -EINVAL; 1029 break; 1030 } 1031 1032 /* check for special events */ 1033 if (event.type == SNDRV_SEQ_EVENT_NONE) 1034 goto __skip_event; 1035 else if (snd_seq_ev_is_reserved(&event)) { 1036 err = -EINVAL; 1037 break; 1038 } 1039 1040 if (snd_seq_ev_is_variable(&event)) { 1041 int extlen = event.data.ext.len & ~SNDRV_SEQ_EXT_MASK; 1042 if ((size_t)(extlen + len) > count) { 1043 /* back out, will get an error this time or next */ 1044 err = -EINVAL; 1045 break; 1046 } 1047 /* set user space pointer */ 1048 event.data.ext.len = extlen | SNDRV_SEQ_EXT_USRPTR; 1049 event.data.ext.ptr = (char __force *)buf 1050 + sizeof(struct snd_seq_event); 1051 len += extlen; /* increment data length */ 1052 } else { 1053 #ifdef CONFIG_COMPAT 1054 if (client->convert32 && snd_seq_ev_is_varusr(&event)) { 1055 void *ptr = (void __force *)compat_ptr(event.data.raw32.d[1]); 1056 event.data.ext.ptr = ptr; 1057 } 1058 #endif 1059 } 1060 1061 /* ok, enqueue it */ 1062 err = snd_seq_client_enqueue_event(client, &event, file, 1063 !(file->f_flags & O_NONBLOCK), 1064 0, 0); 1065 if (err < 0) 1066 break; 1067 1068 __skip_event: 1069 /* Update pointers and counts */ 1070 count -= len; 1071 buf += len; 1072 written += len; 1073 } 1074 1075 return written ? written : err; 1076 } 1077 1078 1079 /* 1080 * handle polling 1081 */ 1082 static unsigned int snd_seq_poll(struct file *file, poll_table * wait) 1083 { 1084 struct snd_seq_client *client = file->private_data; 1085 unsigned int mask = 0; 1086 1087 /* check client structures are in place */ 1088 if (snd_BUG_ON(!client)) 1089 return -ENXIO; 1090 1091 if ((snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_INPUT) && 1092 client->data.user.fifo) { 1093 1094 /* check if data is available in the outqueue */ 1095 if (snd_seq_fifo_poll_wait(client->data.user.fifo, file, wait)) 1096 mask |= POLLIN | POLLRDNORM; 1097 } 1098 1099 if (snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT) { 1100 1101 /* check if data is available in the pool */ 1102 if (!snd_seq_write_pool_allocated(client) || 1103 snd_seq_pool_poll_wait(client->pool, file, wait)) 1104 mask |= POLLOUT | POLLWRNORM; 1105 } 1106 1107 return mask; 1108 } 1109 1110 1111 /*-----------------------------------------------------*/ 1112 1113 1114 /* SYSTEM_INFO ioctl() */ 1115 static int snd_seq_ioctl_system_info(struct snd_seq_client *client, void __user *arg) 1116 { 1117 struct snd_seq_system_info info; 1118 1119 memset(&info, 0, sizeof(info)); 1120 /* fill the info fields */ 1121 info.queues = SNDRV_SEQ_MAX_QUEUES; 1122 info.clients = SNDRV_SEQ_MAX_CLIENTS; 1123 info.ports = 256; /* fixed limit */ 1124 info.channels = 256; /* fixed limit */ 1125 info.cur_clients = client_usage.cur; 1126 info.cur_queues = snd_seq_queue_get_cur_queues(); 1127 1128 if (copy_to_user(arg, &info, sizeof(info))) 1129 return -EFAULT; 1130 return 0; 1131 } 1132 1133 1134 /* RUNNING_MODE ioctl() */ 1135 static int snd_seq_ioctl_running_mode(struct snd_seq_client *client, void __user *arg) 1136 { 1137 struct snd_seq_running_info info; 1138 struct snd_seq_client *cptr; 1139 int err = 0; 1140 1141 if (copy_from_user(&info, arg, sizeof(info))) 1142 return -EFAULT; 1143 1144 /* requested client number */ 1145 cptr = snd_seq_client_use_ptr(info.client); 1146 if (cptr == NULL) 1147 return -ENOENT; /* don't change !!! */ 1148 1149 #ifdef SNDRV_BIG_ENDIAN 1150 if (! info.big_endian) { 1151 err = -EINVAL; 1152 goto __err; 1153 } 1154 #else 1155 if (info.big_endian) { 1156 err = -EINVAL; 1157 goto __err; 1158 } 1159 1160 #endif 1161 if (info.cpu_mode > sizeof(long)) { 1162 err = -EINVAL; 1163 goto __err; 1164 } 1165 cptr->convert32 = (info.cpu_mode < sizeof(long)); 1166 __err: 1167 snd_seq_client_unlock(cptr); 1168 return err; 1169 } 1170 1171 /* CLIENT_INFO ioctl() */ 1172 static void get_client_info(struct snd_seq_client *cptr, 1173 struct snd_seq_client_info *info) 1174 { 1175 info->client = cptr->number; 1176 1177 /* fill the info fields */ 1178 info->type = cptr->type; 1179 strcpy(info->name, cptr->name); 1180 info->filter = cptr->filter; 1181 info->event_lost = cptr->event_lost; 1182 memcpy(info->event_filter, cptr->event_filter, 32); 1183 info->num_ports = cptr->num_ports; 1184 memset(info->reserved, 0, sizeof(info->reserved)); 1185 } 1186 1187 static int snd_seq_ioctl_get_client_info(struct snd_seq_client *client, 1188 void __user *arg) 1189 { 1190 struct snd_seq_client *cptr; 1191 struct snd_seq_client_info client_info; 1192 1193 if (copy_from_user(&client_info, arg, sizeof(client_info))) 1194 return -EFAULT; 1195 1196 /* requested client number */ 1197 cptr = snd_seq_client_use_ptr(client_info.client); 1198 if (cptr == NULL) 1199 return -ENOENT; /* don't change !!! */ 1200 1201 get_client_info(cptr, &client_info); 1202 snd_seq_client_unlock(cptr); 1203 1204 if (copy_to_user(arg, &client_info, sizeof(client_info))) 1205 return -EFAULT; 1206 return 0; 1207 } 1208 1209 1210 /* CLIENT_INFO ioctl() */ 1211 static int snd_seq_ioctl_set_client_info(struct snd_seq_client *client, 1212 void __user *arg) 1213 { 1214 struct snd_seq_client_info client_info; 1215 1216 if (copy_from_user(&client_info, arg, sizeof(client_info))) 1217 return -EFAULT; 1218 1219 /* it is not allowed to set the info fields for an another client */ 1220 if (client->number != client_info.client) 1221 return -EPERM; 1222 /* also client type must be set now */ 1223 if (client->type != client_info.type) 1224 return -EINVAL; 1225 1226 /* fill the info fields */ 1227 if (client_info.name[0]) 1228 strlcpy(client->name, client_info.name, sizeof(client->name)); 1229 1230 client->filter = client_info.filter; 1231 client->event_lost = client_info.event_lost; 1232 memcpy(client->event_filter, client_info.event_filter, 32); 1233 1234 return 0; 1235 } 1236 1237 1238 /* 1239 * CREATE PORT ioctl() 1240 */ 1241 static int snd_seq_ioctl_create_port(struct snd_seq_client *client, 1242 void __user *arg) 1243 { 1244 struct snd_seq_client_port *port; 1245 struct snd_seq_port_info info; 1246 struct snd_seq_port_callback *callback; 1247 1248 if (copy_from_user(&info, arg, sizeof(info))) 1249 return -EFAULT; 1250 1251 /* it is not allowed to create the port for an another client */ 1252 if (info.addr.client != client->number) 1253 return -EPERM; 1254 1255 port = snd_seq_create_port(client, (info.flags & SNDRV_SEQ_PORT_FLG_GIVEN_PORT) ? info.addr.port : -1); 1256 if (port == NULL) 1257 return -ENOMEM; 1258 1259 if (client->type == USER_CLIENT && info.kernel) { 1260 snd_seq_delete_port(client, port->addr.port); 1261 return -EINVAL; 1262 } 1263 if (client->type == KERNEL_CLIENT) { 1264 if ((callback = info.kernel) != NULL) { 1265 if (callback->owner) 1266 port->owner = callback->owner; 1267 port->private_data = callback->private_data; 1268 port->private_free = callback->private_free; 1269 port->callback_all = callback->callback_all; 1270 port->event_input = callback->event_input; 1271 port->c_src.open = callback->subscribe; 1272 port->c_src.close = callback->unsubscribe; 1273 port->c_dest.open = callback->use; 1274 port->c_dest.close = callback->unuse; 1275 } 1276 } 1277 1278 info.addr = port->addr; 1279 1280 snd_seq_set_port_info(port, &info); 1281 snd_seq_system_client_ev_port_start(port->addr.client, port->addr.port); 1282 1283 if (copy_to_user(arg, &info, sizeof(info))) 1284 return -EFAULT; 1285 1286 return 0; 1287 } 1288 1289 /* 1290 * DELETE PORT ioctl() 1291 */ 1292 static int snd_seq_ioctl_delete_port(struct snd_seq_client *client, 1293 void __user *arg) 1294 { 1295 struct snd_seq_port_info info; 1296 int err; 1297 1298 /* set passed parameters */ 1299 if (copy_from_user(&info, arg, sizeof(info))) 1300 return -EFAULT; 1301 1302 /* it is not allowed to remove the port for an another client */ 1303 if (info.addr.client != client->number) 1304 return -EPERM; 1305 1306 err = snd_seq_delete_port(client, info.addr.port); 1307 if (err >= 0) 1308 snd_seq_system_client_ev_port_exit(client->number, info.addr.port); 1309 return err; 1310 } 1311 1312 1313 /* 1314 * GET_PORT_INFO ioctl() (on any client) 1315 */ 1316 static int snd_seq_ioctl_get_port_info(struct snd_seq_client *client, 1317 void __user *arg) 1318 { 1319 struct snd_seq_client *cptr; 1320 struct snd_seq_client_port *port; 1321 struct snd_seq_port_info info; 1322 1323 if (copy_from_user(&info, arg, sizeof(info))) 1324 return -EFAULT; 1325 cptr = snd_seq_client_use_ptr(info.addr.client); 1326 if (cptr == NULL) 1327 return -ENXIO; 1328 1329 port = snd_seq_port_use_ptr(cptr, info.addr.port); 1330 if (port == NULL) { 1331 snd_seq_client_unlock(cptr); 1332 return -ENOENT; /* don't change */ 1333 } 1334 1335 /* get port info */ 1336 snd_seq_get_port_info(port, &info); 1337 snd_seq_port_unlock(port); 1338 snd_seq_client_unlock(cptr); 1339 1340 if (copy_to_user(arg, &info, sizeof(info))) 1341 return -EFAULT; 1342 return 0; 1343 } 1344 1345 1346 /* 1347 * SET_PORT_INFO ioctl() (only ports on this/own client) 1348 */ 1349 static int snd_seq_ioctl_set_port_info(struct snd_seq_client *client, 1350 void __user *arg) 1351 { 1352 struct snd_seq_client_port *port; 1353 struct snd_seq_port_info info; 1354 1355 if (copy_from_user(&info, arg, sizeof(info))) 1356 return -EFAULT; 1357 1358 if (info.addr.client != client->number) /* only set our own ports ! */ 1359 return -EPERM; 1360 port = snd_seq_port_use_ptr(client, info.addr.port); 1361 if (port) { 1362 snd_seq_set_port_info(port, &info); 1363 snd_seq_port_unlock(port); 1364 } 1365 return 0; 1366 } 1367 1368 1369 /* 1370 * port subscription (connection) 1371 */ 1372 #define PERM_RD (SNDRV_SEQ_PORT_CAP_READ|SNDRV_SEQ_PORT_CAP_SUBS_READ) 1373 #define PERM_WR (SNDRV_SEQ_PORT_CAP_WRITE|SNDRV_SEQ_PORT_CAP_SUBS_WRITE) 1374 1375 static int check_subscription_permission(struct snd_seq_client *client, 1376 struct snd_seq_client_port *sport, 1377 struct snd_seq_client_port *dport, 1378 struct snd_seq_port_subscribe *subs) 1379 { 1380 if (client->number != subs->sender.client && 1381 client->number != subs->dest.client) { 1382 /* connection by third client - check export permission */ 1383 if (check_port_perm(sport, SNDRV_SEQ_PORT_CAP_NO_EXPORT)) 1384 return -EPERM; 1385 if (check_port_perm(dport, SNDRV_SEQ_PORT_CAP_NO_EXPORT)) 1386 return -EPERM; 1387 } 1388 1389 /* check read permission */ 1390 /* if sender or receiver is the subscribing client itself, 1391 * no permission check is necessary 1392 */ 1393 if (client->number != subs->sender.client) { 1394 if (! check_port_perm(sport, PERM_RD)) 1395 return -EPERM; 1396 } 1397 /* check write permission */ 1398 if (client->number != subs->dest.client) { 1399 if (! check_port_perm(dport, PERM_WR)) 1400 return -EPERM; 1401 } 1402 return 0; 1403 } 1404 1405 /* 1406 * send an subscription notify event to user client: 1407 * client must be user client. 1408 */ 1409 int snd_seq_client_notify_subscription(int client, int port, 1410 struct snd_seq_port_subscribe *info, 1411 int evtype) 1412 { 1413 struct snd_seq_event event; 1414 1415 memset(&event, 0, sizeof(event)); 1416 event.type = evtype; 1417 event.data.connect.dest = info->dest; 1418 event.data.connect.sender = info->sender; 1419 1420 return snd_seq_system_notify(client, port, &event); /* non-atomic */ 1421 } 1422 1423 1424 /* 1425 * add to port's subscription list IOCTL interface 1426 */ 1427 static int snd_seq_ioctl_subscribe_port(struct snd_seq_client *client, 1428 void __user *arg) 1429 { 1430 int result = -EINVAL; 1431 struct snd_seq_client *receiver = NULL, *sender = NULL; 1432 struct snd_seq_client_port *sport = NULL, *dport = NULL; 1433 struct snd_seq_port_subscribe subs; 1434 1435 if (copy_from_user(&subs, arg, sizeof(subs))) 1436 return -EFAULT; 1437 1438 if ((receiver = snd_seq_client_use_ptr(subs.dest.client)) == NULL) 1439 goto __end; 1440 if ((sender = snd_seq_client_use_ptr(subs.sender.client)) == NULL) 1441 goto __end; 1442 if ((sport = snd_seq_port_use_ptr(sender, subs.sender.port)) == NULL) 1443 goto __end; 1444 if ((dport = snd_seq_port_use_ptr(receiver, subs.dest.port)) == NULL) 1445 goto __end; 1446 1447 result = check_subscription_permission(client, sport, dport, &subs); 1448 if (result < 0) 1449 goto __end; 1450 1451 /* connect them */ 1452 result = snd_seq_port_connect(client, sender, sport, receiver, dport, &subs); 1453 if (! result) /* broadcast announce */ 1454 snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0, 1455 &subs, SNDRV_SEQ_EVENT_PORT_SUBSCRIBED); 1456 __end: 1457 if (sport) 1458 snd_seq_port_unlock(sport); 1459 if (dport) 1460 snd_seq_port_unlock(dport); 1461 if (sender) 1462 snd_seq_client_unlock(sender); 1463 if (receiver) 1464 snd_seq_client_unlock(receiver); 1465 return result; 1466 } 1467 1468 1469 /* 1470 * remove from port's subscription list 1471 */ 1472 static int snd_seq_ioctl_unsubscribe_port(struct snd_seq_client *client, 1473 void __user *arg) 1474 { 1475 int result = -ENXIO; 1476 struct snd_seq_client *receiver = NULL, *sender = NULL; 1477 struct snd_seq_client_port *sport = NULL, *dport = NULL; 1478 struct snd_seq_port_subscribe subs; 1479 1480 if (copy_from_user(&subs, arg, sizeof(subs))) 1481 return -EFAULT; 1482 1483 if ((receiver = snd_seq_client_use_ptr(subs.dest.client)) == NULL) 1484 goto __end; 1485 if ((sender = snd_seq_client_use_ptr(subs.sender.client)) == NULL) 1486 goto __end; 1487 if ((sport = snd_seq_port_use_ptr(sender, subs.sender.port)) == NULL) 1488 goto __end; 1489 if ((dport = snd_seq_port_use_ptr(receiver, subs.dest.port)) == NULL) 1490 goto __end; 1491 1492 result = check_subscription_permission(client, sport, dport, &subs); 1493 if (result < 0) 1494 goto __end; 1495 1496 result = snd_seq_port_disconnect(client, sender, sport, receiver, dport, &subs); 1497 if (! result) /* broadcast announce */ 1498 snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0, 1499 &subs, SNDRV_SEQ_EVENT_PORT_UNSUBSCRIBED); 1500 __end: 1501 if (sport) 1502 snd_seq_port_unlock(sport); 1503 if (dport) 1504 snd_seq_port_unlock(dport); 1505 if (sender) 1506 snd_seq_client_unlock(sender); 1507 if (receiver) 1508 snd_seq_client_unlock(receiver); 1509 return result; 1510 } 1511 1512 1513 /* CREATE_QUEUE ioctl() */ 1514 static int snd_seq_ioctl_create_queue(struct snd_seq_client *client, 1515 void __user *arg) 1516 { 1517 struct snd_seq_queue_info info; 1518 int result; 1519 struct snd_seq_queue *q; 1520 1521 if (copy_from_user(&info, arg, sizeof(info))) 1522 return -EFAULT; 1523 1524 result = snd_seq_queue_alloc(client->number, info.locked, info.flags); 1525 if (result < 0) 1526 return result; 1527 1528 q = queueptr(result); 1529 if (q == NULL) 1530 return -EINVAL; 1531 1532 info.queue = q->queue; 1533 info.locked = q->locked; 1534 info.owner = q->owner; 1535 1536 /* set queue name */ 1537 if (! info.name[0]) 1538 snprintf(info.name, sizeof(info.name), "Queue-%d", q->queue); 1539 strlcpy(q->name, info.name, sizeof(q->name)); 1540 queuefree(q); 1541 1542 if (copy_to_user(arg, &info, sizeof(info))) 1543 return -EFAULT; 1544 1545 return 0; 1546 } 1547 1548 /* DELETE_QUEUE ioctl() */ 1549 static int snd_seq_ioctl_delete_queue(struct snd_seq_client *client, 1550 void __user *arg) 1551 { 1552 struct snd_seq_queue_info info; 1553 1554 if (copy_from_user(&info, arg, sizeof(info))) 1555 return -EFAULT; 1556 1557 return snd_seq_queue_delete(client->number, info.queue); 1558 } 1559 1560 /* GET_QUEUE_INFO ioctl() */ 1561 static int snd_seq_ioctl_get_queue_info(struct snd_seq_client *client, 1562 void __user *arg) 1563 { 1564 struct snd_seq_queue_info info; 1565 struct snd_seq_queue *q; 1566 1567 if (copy_from_user(&info, arg, sizeof(info))) 1568 return -EFAULT; 1569 1570 q = queueptr(info.queue); 1571 if (q == NULL) 1572 return -EINVAL; 1573 1574 memset(&info, 0, sizeof(info)); 1575 info.queue = q->queue; 1576 info.owner = q->owner; 1577 info.locked = q->locked; 1578 strlcpy(info.name, q->name, sizeof(info.name)); 1579 queuefree(q); 1580 1581 if (copy_to_user(arg, &info, sizeof(info))) 1582 return -EFAULT; 1583 1584 return 0; 1585 } 1586 1587 /* SET_QUEUE_INFO ioctl() */ 1588 static int snd_seq_ioctl_set_queue_info(struct snd_seq_client *client, 1589 void __user *arg) 1590 { 1591 struct snd_seq_queue_info info; 1592 struct snd_seq_queue *q; 1593 1594 if (copy_from_user(&info, arg, sizeof(info))) 1595 return -EFAULT; 1596 1597 if (info.owner != client->number) 1598 return -EINVAL; 1599 1600 /* change owner/locked permission */ 1601 if (snd_seq_queue_check_access(info.queue, client->number)) { 1602 if (snd_seq_queue_set_owner(info.queue, client->number, info.locked) < 0) 1603 return -EPERM; 1604 if (info.locked) 1605 snd_seq_queue_use(info.queue, client->number, 1); 1606 } else { 1607 return -EPERM; 1608 } 1609 1610 q = queueptr(info.queue); 1611 if (! q) 1612 return -EINVAL; 1613 if (q->owner != client->number) { 1614 queuefree(q); 1615 return -EPERM; 1616 } 1617 strlcpy(q->name, info.name, sizeof(q->name)); 1618 queuefree(q); 1619 1620 return 0; 1621 } 1622 1623 /* GET_NAMED_QUEUE ioctl() */ 1624 static int snd_seq_ioctl_get_named_queue(struct snd_seq_client *client, void __user *arg) 1625 { 1626 struct snd_seq_queue_info info; 1627 struct snd_seq_queue *q; 1628 1629 if (copy_from_user(&info, arg, sizeof(info))) 1630 return -EFAULT; 1631 1632 q = snd_seq_queue_find_name(info.name); 1633 if (q == NULL) 1634 return -EINVAL; 1635 info.queue = q->queue; 1636 info.owner = q->owner; 1637 info.locked = q->locked; 1638 queuefree(q); 1639 1640 if (copy_to_user(arg, &info, sizeof(info))) 1641 return -EFAULT; 1642 1643 return 0; 1644 } 1645 1646 /* GET_QUEUE_STATUS ioctl() */ 1647 static int snd_seq_ioctl_get_queue_status(struct snd_seq_client *client, 1648 void __user *arg) 1649 { 1650 struct snd_seq_queue_status status; 1651 struct snd_seq_queue *queue; 1652 struct snd_seq_timer *tmr; 1653 1654 if (copy_from_user(&status, arg, sizeof(status))) 1655 return -EFAULT; 1656 1657 queue = queueptr(status.queue); 1658 if (queue == NULL) 1659 return -EINVAL; 1660 memset(&status, 0, sizeof(status)); 1661 status.queue = queue->queue; 1662 1663 tmr = queue->timer; 1664 status.events = queue->tickq->cells + queue->timeq->cells; 1665 1666 status.time = snd_seq_timer_get_cur_time(tmr); 1667 status.tick = snd_seq_timer_get_cur_tick(tmr); 1668 1669 status.running = tmr->running; 1670 1671 status.flags = queue->flags; 1672 queuefree(queue); 1673 1674 if (copy_to_user(arg, &status, sizeof(status))) 1675 return -EFAULT; 1676 return 0; 1677 } 1678 1679 1680 /* GET_QUEUE_TEMPO ioctl() */ 1681 static int snd_seq_ioctl_get_queue_tempo(struct snd_seq_client *client, 1682 void __user *arg) 1683 { 1684 struct snd_seq_queue_tempo tempo; 1685 struct snd_seq_queue *queue; 1686 struct snd_seq_timer *tmr; 1687 1688 if (copy_from_user(&tempo, arg, sizeof(tempo))) 1689 return -EFAULT; 1690 1691 queue = queueptr(tempo.queue); 1692 if (queue == NULL) 1693 return -EINVAL; 1694 memset(&tempo, 0, sizeof(tempo)); 1695 tempo.queue = queue->queue; 1696 1697 tmr = queue->timer; 1698 1699 tempo.tempo = tmr->tempo; 1700 tempo.ppq = tmr->ppq; 1701 tempo.skew_value = tmr->skew; 1702 tempo.skew_base = tmr->skew_base; 1703 queuefree(queue); 1704 1705 if (copy_to_user(arg, &tempo, sizeof(tempo))) 1706 return -EFAULT; 1707 return 0; 1708 } 1709 1710 1711 /* SET_QUEUE_TEMPO ioctl() */ 1712 int snd_seq_set_queue_tempo(int client, struct snd_seq_queue_tempo *tempo) 1713 { 1714 if (!snd_seq_queue_check_access(tempo->queue, client)) 1715 return -EPERM; 1716 return snd_seq_queue_timer_set_tempo(tempo->queue, client, tempo); 1717 } 1718 1719 EXPORT_SYMBOL(snd_seq_set_queue_tempo); 1720 1721 static int snd_seq_ioctl_set_queue_tempo(struct snd_seq_client *client, 1722 void __user *arg) 1723 { 1724 int result; 1725 struct snd_seq_queue_tempo tempo; 1726 1727 if (copy_from_user(&tempo, arg, sizeof(tempo))) 1728 return -EFAULT; 1729 1730 result = snd_seq_set_queue_tempo(client->number, &tempo); 1731 return result < 0 ? result : 0; 1732 } 1733 1734 1735 /* GET_QUEUE_TIMER ioctl() */ 1736 static int snd_seq_ioctl_get_queue_timer(struct snd_seq_client *client, 1737 void __user *arg) 1738 { 1739 struct snd_seq_queue_timer timer; 1740 struct snd_seq_queue *queue; 1741 struct snd_seq_timer *tmr; 1742 1743 if (copy_from_user(&timer, arg, sizeof(timer))) 1744 return -EFAULT; 1745 1746 queue = queueptr(timer.queue); 1747 if (queue == NULL) 1748 return -EINVAL; 1749 1750 if (mutex_lock_interruptible(&queue->timer_mutex)) { 1751 queuefree(queue); 1752 return -ERESTARTSYS; 1753 } 1754 tmr = queue->timer; 1755 memset(&timer, 0, sizeof(timer)); 1756 timer.queue = queue->queue; 1757 1758 timer.type = tmr->type; 1759 if (tmr->type == SNDRV_SEQ_TIMER_ALSA) { 1760 timer.u.alsa.id = tmr->alsa_id; 1761 timer.u.alsa.resolution = tmr->preferred_resolution; 1762 } 1763 mutex_unlock(&queue->timer_mutex); 1764 queuefree(queue); 1765 1766 if (copy_to_user(arg, &timer, sizeof(timer))) 1767 return -EFAULT; 1768 return 0; 1769 } 1770 1771 1772 /* SET_QUEUE_TIMER ioctl() */ 1773 static int snd_seq_ioctl_set_queue_timer(struct snd_seq_client *client, 1774 void __user *arg) 1775 { 1776 int result = 0; 1777 struct snd_seq_queue_timer timer; 1778 1779 if (copy_from_user(&timer, arg, sizeof(timer))) 1780 return -EFAULT; 1781 1782 if (timer.type != SNDRV_SEQ_TIMER_ALSA) 1783 return -EINVAL; 1784 1785 if (snd_seq_queue_check_access(timer.queue, client->number)) { 1786 struct snd_seq_queue *q; 1787 struct snd_seq_timer *tmr; 1788 1789 q = queueptr(timer.queue); 1790 if (q == NULL) 1791 return -ENXIO; 1792 if (mutex_lock_interruptible(&q->timer_mutex)) { 1793 queuefree(q); 1794 return -ERESTARTSYS; 1795 } 1796 tmr = q->timer; 1797 snd_seq_queue_timer_close(timer.queue); 1798 tmr->type = timer.type; 1799 if (tmr->type == SNDRV_SEQ_TIMER_ALSA) { 1800 tmr->alsa_id = timer.u.alsa.id; 1801 tmr->preferred_resolution = timer.u.alsa.resolution; 1802 } 1803 result = snd_seq_queue_timer_open(timer.queue); 1804 mutex_unlock(&q->timer_mutex); 1805 queuefree(q); 1806 } else { 1807 return -EPERM; 1808 } 1809 1810 return result; 1811 } 1812 1813 1814 /* GET_QUEUE_CLIENT ioctl() */ 1815 static int snd_seq_ioctl_get_queue_client(struct snd_seq_client *client, 1816 void __user *arg) 1817 { 1818 struct snd_seq_queue_client info; 1819 int used; 1820 1821 if (copy_from_user(&info, arg, sizeof(info))) 1822 return -EFAULT; 1823 1824 used = snd_seq_queue_is_used(info.queue, client->number); 1825 if (used < 0) 1826 return -EINVAL; 1827 info.used = used; 1828 info.client = client->number; 1829 1830 if (copy_to_user(arg, &info, sizeof(info))) 1831 return -EFAULT; 1832 return 0; 1833 } 1834 1835 1836 /* SET_QUEUE_CLIENT ioctl() */ 1837 static int snd_seq_ioctl_set_queue_client(struct snd_seq_client *client, 1838 void __user *arg) 1839 { 1840 int err; 1841 struct snd_seq_queue_client info; 1842 1843 if (copy_from_user(&info, arg, sizeof(info))) 1844 return -EFAULT; 1845 1846 if (info.used >= 0) { 1847 err = snd_seq_queue_use(info.queue, client->number, info.used); 1848 if (err < 0) 1849 return err; 1850 } 1851 1852 return snd_seq_ioctl_get_queue_client(client, arg); 1853 } 1854 1855 1856 /* GET_CLIENT_POOL ioctl() */ 1857 static int snd_seq_ioctl_get_client_pool(struct snd_seq_client *client, 1858 void __user *arg) 1859 { 1860 struct snd_seq_client_pool info; 1861 struct snd_seq_client *cptr; 1862 1863 if (copy_from_user(&info, arg, sizeof(info))) 1864 return -EFAULT; 1865 1866 cptr = snd_seq_client_use_ptr(info.client); 1867 if (cptr == NULL) 1868 return -ENOENT; 1869 memset(&info, 0, sizeof(info)); 1870 info.output_pool = cptr->pool->size; 1871 info.output_room = cptr->pool->room; 1872 info.output_free = info.output_pool; 1873 info.output_free = snd_seq_unused_cells(cptr->pool); 1874 if (cptr->type == USER_CLIENT) { 1875 info.input_pool = cptr->data.user.fifo_pool_size; 1876 info.input_free = info.input_pool; 1877 if (cptr->data.user.fifo) 1878 info.input_free = snd_seq_unused_cells(cptr->data.user.fifo->pool); 1879 } else { 1880 info.input_pool = 0; 1881 info.input_free = 0; 1882 } 1883 snd_seq_client_unlock(cptr); 1884 1885 if (copy_to_user(arg, &info, sizeof(info))) 1886 return -EFAULT; 1887 return 0; 1888 } 1889 1890 /* SET_CLIENT_POOL ioctl() */ 1891 static int snd_seq_ioctl_set_client_pool(struct snd_seq_client *client, 1892 void __user *arg) 1893 { 1894 struct snd_seq_client_pool info; 1895 int rc; 1896 1897 if (copy_from_user(&info, arg, sizeof(info))) 1898 return -EFAULT; 1899 1900 if (client->number != info.client) 1901 return -EINVAL; /* can't change other clients */ 1902 1903 if (info.output_pool >= 1 && info.output_pool <= SNDRV_SEQ_MAX_EVENTS && 1904 (! snd_seq_write_pool_allocated(client) || 1905 info.output_pool != client->pool->size)) { 1906 if (snd_seq_write_pool_allocated(client)) { 1907 /* remove all existing cells */ 1908 snd_seq_queue_client_leave_cells(client->number); 1909 snd_seq_pool_done(client->pool); 1910 } 1911 client->pool->size = info.output_pool; 1912 rc = snd_seq_pool_init(client->pool); 1913 if (rc < 0) 1914 return rc; 1915 } 1916 if (client->type == USER_CLIENT && client->data.user.fifo != NULL && 1917 info.input_pool >= 1 && 1918 info.input_pool <= SNDRV_SEQ_MAX_CLIENT_EVENTS && 1919 info.input_pool != client->data.user.fifo_pool_size) { 1920 /* change pool size */ 1921 rc = snd_seq_fifo_resize(client->data.user.fifo, info.input_pool); 1922 if (rc < 0) 1923 return rc; 1924 client->data.user.fifo_pool_size = info.input_pool; 1925 } 1926 if (info.output_room >= 1 && 1927 info.output_room <= client->pool->size) { 1928 client->pool->room = info.output_room; 1929 } 1930 1931 return snd_seq_ioctl_get_client_pool(client, arg); 1932 } 1933 1934 1935 /* REMOVE_EVENTS ioctl() */ 1936 static int snd_seq_ioctl_remove_events(struct snd_seq_client *client, 1937 void __user *arg) 1938 { 1939 struct snd_seq_remove_events info; 1940 1941 if (copy_from_user(&info, arg, sizeof(info))) 1942 return -EFAULT; 1943 1944 /* 1945 * Input mostly not implemented XXX. 1946 */ 1947 if (info.remove_mode & SNDRV_SEQ_REMOVE_INPUT) { 1948 /* 1949 * No restrictions so for a user client we can clear 1950 * the whole fifo 1951 */ 1952 if (client->type == USER_CLIENT) 1953 snd_seq_fifo_clear(client->data.user.fifo); 1954 } 1955 1956 if (info.remove_mode & SNDRV_SEQ_REMOVE_OUTPUT) 1957 snd_seq_queue_remove_cells(client->number, &info); 1958 1959 return 0; 1960 } 1961 1962 1963 /* 1964 * get subscription info 1965 */ 1966 static int snd_seq_ioctl_get_subscription(struct snd_seq_client *client, 1967 void __user *arg) 1968 { 1969 int result; 1970 struct snd_seq_client *sender = NULL; 1971 struct snd_seq_client_port *sport = NULL; 1972 struct snd_seq_port_subscribe subs; 1973 struct snd_seq_subscribers *p; 1974 1975 if (copy_from_user(&subs, arg, sizeof(subs))) 1976 return -EFAULT; 1977 1978 result = -EINVAL; 1979 if ((sender = snd_seq_client_use_ptr(subs.sender.client)) == NULL) 1980 goto __end; 1981 if ((sport = snd_seq_port_use_ptr(sender, subs.sender.port)) == NULL) 1982 goto __end; 1983 p = snd_seq_port_get_subscription(&sport->c_src, &subs.dest); 1984 if (p) { 1985 result = 0; 1986 subs = p->info; 1987 } else 1988 result = -ENOENT; 1989 1990 __end: 1991 if (sport) 1992 snd_seq_port_unlock(sport); 1993 if (sender) 1994 snd_seq_client_unlock(sender); 1995 if (result >= 0) { 1996 if (copy_to_user(arg, &subs, sizeof(subs))) 1997 return -EFAULT; 1998 } 1999 return result; 2000 } 2001 2002 2003 /* 2004 * get subscription info - check only its presence 2005 */ 2006 static int snd_seq_ioctl_query_subs(struct snd_seq_client *client, 2007 void __user *arg) 2008 { 2009 int result = -ENXIO; 2010 struct snd_seq_client *cptr = NULL; 2011 struct snd_seq_client_port *port = NULL; 2012 struct snd_seq_query_subs subs; 2013 struct snd_seq_port_subs_info *group; 2014 struct list_head *p; 2015 int i; 2016 2017 if (copy_from_user(&subs, arg, sizeof(subs))) 2018 return -EFAULT; 2019 2020 if ((cptr = snd_seq_client_use_ptr(subs.root.client)) == NULL) 2021 goto __end; 2022 if ((port = snd_seq_port_use_ptr(cptr, subs.root.port)) == NULL) 2023 goto __end; 2024 2025 switch (subs.type) { 2026 case SNDRV_SEQ_QUERY_SUBS_READ: 2027 group = &port->c_src; 2028 break; 2029 case SNDRV_SEQ_QUERY_SUBS_WRITE: 2030 group = &port->c_dest; 2031 break; 2032 default: 2033 goto __end; 2034 } 2035 2036 down_read(&group->list_mutex); 2037 /* search for the subscriber */ 2038 subs.num_subs = group->count; 2039 i = 0; 2040 result = -ENOENT; 2041 list_for_each(p, &group->list_head) { 2042 if (i++ == subs.index) { 2043 /* found! */ 2044 struct snd_seq_subscribers *s; 2045 if (subs.type == SNDRV_SEQ_QUERY_SUBS_READ) { 2046 s = list_entry(p, struct snd_seq_subscribers, src_list); 2047 subs.addr = s->info.dest; 2048 } else { 2049 s = list_entry(p, struct snd_seq_subscribers, dest_list); 2050 subs.addr = s->info.sender; 2051 } 2052 subs.flags = s->info.flags; 2053 subs.queue = s->info.queue; 2054 result = 0; 2055 break; 2056 } 2057 } 2058 up_read(&group->list_mutex); 2059 2060 __end: 2061 if (port) 2062 snd_seq_port_unlock(port); 2063 if (cptr) 2064 snd_seq_client_unlock(cptr); 2065 if (result >= 0) { 2066 if (copy_to_user(arg, &subs, sizeof(subs))) 2067 return -EFAULT; 2068 } 2069 return result; 2070 } 2071 2072 2073 /* 2074 * query next client 2075 */ 2076 static int snd_seq_ioctl_query_next_client(struct snd_seq_client *client, 2077 void __user *arg) 2078 { 2079 struct snd_seq_client *cptr = NULL; 2080 struct snd_seq_client_info info; 2081 2082 if (copy_from_user(&info, arg, sizeof(info))) 2083 return -EFAULT; 2084 2085 /* search for next client */ 2086 info.client++; 2087 if (info.client < 0) 2088 info.client = 0; 2089 for (; info.client < SNDRV_SEQ_MAX_CLIENTS; info.client++) { 2090 cptr = snd_seq_client_use_ptr(info.client); 2091 if (cptr) 2092 break; /* found */ 2093 } 2094 if (cptr == NULL) 2095 return -ENOENT; 2096 2097 get_client_info(cptr, &info); 2098 snd_seq_client_unlock(cptr); 2099 2100 if (copy_to_user(arg, &info, sizeof(info))) 2101 return -EFAULT; 2102 return 0; 2103 } 2104 2105 /* 2106 * query next port 2107 */ 2108 static int snd_seq_ioctl_query_next_port(struct snd_seq_client *client, 2109 void __user *arg) 2110 { 2111 struct snd_seq_client *cptr; 2112 struct snd_seq_client_port *port = NULL; 2113 struct snd_seq_port_info info; 2114 2115 if (copy_from_user(&info, arg, sizeof(info))) 2116 return -EFAULT; 2117 cptr = snd_seq_client_use_ptr(info.addr.client); 2118 if (cptr == NULL) 2119 return -ENXIO; 2120 2121 /* search for next port */ 2122 info.addr.port++; 2123 port = snd_seq_port_query_nearest(cptr, &info); 2124 if (port == NULL) { 2125 snd_seq_client_unlock(cptr); 2126 return -ENOENT; 2127 } 2128 2129 /* get port info */ 2130 info.addr = port->addr; 2131 snd_seq_get_port_info(port, &info); 2132 snd_seq_port_unlock(port); 2133 snd_seq_client_unlock(cptr); 2134 2135 if (copy_to_user(arg, &info, sizeof(info))) 2136 return -EFAULT; 2137 return 0; 2138 } 2139 2140 /* -------------------------------------------------------- */ 2141 2142 static struct seq_ioctl_table { 2143 unsigned int cmd; 2144 int (*func)(struct snd_seq_client *client, void __user * arg); 2145 } ioctl_tables[] = { 2146 { SNDRV_SEQ_IOCTL_SYSTEM_INFO, snd_seq_ioctl_system_info }, 2147 { SNDRV_SEQ_IOCTL_RUNNING_MODE, snd_seq_ioctl_running_mode }, 2148 { SNDRV_SEQ_IOCTL_GET_CLIENT_INFO, snd_seq_ioctl_get_client_info }, 2149 { SNDRV_SEQ_IOCTL_SET_CLIENT_INFO, snd_seq_ioctl_set_client_info }, 2150 { SNDRV_SEQ_IOCTL_CREATE_PORT, snd_seq_ioctl_create_port }, 2151 { SNDRV_SEQ_IOCTL_DELETE_PORT, snd_seq_ioctl_delete_port }, 2152 { SNDRV_SEQ_IOCTL_GET_PORT_INFO, snd_seq_ioctl_get_port_info }, 2153 { SNDRV_SEQ_IOCTL_SET_PORT_INFO, snd_seq_ioctl_set_port_info }, 2154 { SNDRV_SEQ_IOCTL_SUBSCRIBE_PORT, snd_seq_ioctl_subscribe_port }, 2155 { SNDRV_SEQ_IOCTL_UNSUBSCRIBE_PORT, snd_seq_ioctl_unsubscribe_port }, 2156 { SNDRV_SEQ_IOCTL_CREATE_QUEUE, snd_seq_ioctl_create_queue }, 2157 { SNDRV_SEQ_IOCTL_DELETE_QUEUE, snd_seq_ioctl_delete_queue }, 2158 { SNDRV_SEQ_IOCTL_GET_QUEUE_INFO, snd_seq_ioctl_get_queue_info }, 2159 { SNDRV_SEQ_IOCTL_SET_QUEUE_INFO, snd_seq_ioctl_set_queue_info }, 2160 { SNDRV_SEQ_IOCTL_GET_NAMED_QUEUE, snd_seq_ioctl_get_named_queue }, 2161 { SNDRV_SEQ_IOCTL_GET_QUEUE_STATUS, snd_seq_ioctl_get_queue_status }, 2162 { SNDRV_SEQ_IOCTL_GET_QUEUE_TEMPO, snd_seq_ioctl_get_queue_tempo }, 2163 { SNDRV_SEQ_IOCTL_SET_QUEUE_TEMPO, snd_seq_ioctl_set_queue_tempo }, 2164 { SNDRV_SEQ_IOCTL_GET_QUEUE_TIMER, snd_seq_ioctl_get_queue_timer }, 2165 { SNDRV_SEQ_IOCTL_SET_QUEUE_TIMER, snd_seq_ioctl_set_queue_timer }, 2166 { SNDRV_SEQ_IOCTL_GET_QUEUE_CLIENT, snd_seq_ioctl_get_queue_client }, 2167 { SNDRV_SEQ_IOCTL_SET_QUEUE_CLIENT, snd_seq_ioctl_set_queue_client }, 2168 { SNDRV_SEQ_IOCTL_GET_CLIENT_POOL, snd_seq_ioctl_get_client_pool }, 2169 { SNDRV_SEQ_IOCTL_SET_CLIENT_POOL, snd_seq_ioctl_set_client_pool }, 2170 { SNDRV_SEQ_IOCTL_GET_SUBSCRIPTION, snd_seq_ioctl_get_subscription }, 2171 { SNDRV_SEQ_IOCTL_QUERY_NEXT_CLIENT, snd_seq_ioctl_query_next_client }, 2172 { SNDRV_SEQ_IOCTL_QUERY_NEXT_PORT, snd_seq_ioctl_query_next_port }, 2173 { SNDRV_SEQ_IOCTL_REMOVE_EVENTS, snd_seq_ioctl_remove_events }, 2174 { SNDRV_SEQ_IOCTL_QUERY_SUBS, snd_seq_ioctl_query_subs }, 2175 { 0, NULL }, 2176 }; 2177 2178 static int snd_seq_do_ioctl(struct snd_seq_client *client, unsigned int cmd, 2179 void __user *arg) 2180 { 2181 struct seq_ioctl_table *p; 2182 2183 switch (cmd) { 2184 case SNDRV_SEQ_IOCTL_PVERSION: 2185 /* return sequencer version number */ 2186 return put_user(SNDRV_SEQ_VERSION, (int __user *)arg) ? -EFAULT : 0; 2187 case SNDRV_SEQ_IOCTL_CLIENT_ID: 2188 /* return the id of this client */ 2189 return put_user(client->number, (int __user *)arg) ? -EFAULT : 0; 2190 } 2191 2192 if (! arg) 2193 return -EFAULT; 2194 for (p = ioctl_tables; p->cmd; p++) { 2195 if (p->cmd == cmd) 2196 return p->func(client, arg); 2197 } 2198 snd_printd("seq unknown ioctl() 0x%x (type='%c', number=0x%02x)\n", 2199 cmd, _IOC_TYPE(cmd), _IOC_NR(cmd)); 2200 return -ENOTTY; 2201 } 2202 2203 2204 static long snd_seq_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 2205 { 2206 struct snd_seq_client *client = file->private_data; 2207 2208 if (snd_BUG_ON(!client)) 2209 return -ENXIO; 2210 2211 return snd_seq_do_ioctl(client, cmd, (void __user *) arg); 2212 } 2213 2214 #ifdef CONFIG_COMPAT 2215 #include "seq_compat.c" 2216 #else 2217 #define snd_seq_ioctl_compat NULL 2218 #endif 2219 2220 /* -------------------------------------------------------- */ 2221 2222 2223 /* exported to kernel modules */ 2224 int snd_seq_create_kernel_client(struct snd_card *card, int client_index, 2225 const char *name_fmt, ...) 2226 { 2227 struct snd_seq_client *client; 2228 va_list args; 2229 2230 if (snd_BUG_ON(in_interrupt())) 2231 return -EBUSY; 2232 2233 if (card && client_index >= SNDRV_SEQ_CLIENTS_PER_CARD) 2234 return -EINVAL; 2235 if (card == NULL && client_index >= SNDRV_SEQ_GLOBAL_CLIENTS) 2236 return -EINVAL; 2237 2238 if (mutex_lock_interruptible(®ister_mutex)) 2239 return -ERESTARTSYS; 2240 2241 if (card) { 2242 client_index += SNDRV_SEQ_GLOBAL_CLIENTS 2243 + card->number * SNDRV_SEQ_CLIENTS_PER_CARD; 2244 if (client_index >= SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN) 2245 client_index = -1; 2246 } 2247 2248 /* empty write queue as default */ 2249 client = seq_create_client1(client_index, 0); 2250 if (client == NULL) { 2251 mutex_unlock(®ister_mutex); 2252 return -EBUSY; /* failure code */ 2253 } 2254 usage_alloc(&client_usage, 1); 2255 2256 client->accept_input = 1; 2257 client->accept_output = 1; 2258 2259 va_start(args, name_fmt); 2260 vsnprintf(client->name, sizeof(client->name), name_fmt, args); 2261 va_end(args); 2262 2263 client->type = KERNEL_CLIENT; 2264 mutex_unlock(®ister_mutex); 2265 2266 /* make others aware this new client */ 2267 snd_seq_system_client_ev_client_start(client->number); 2268 2269 /* return client number to caller */ 2270 return client->number; 2271 } 2272 2273 EXPORT_SYMBOL(snd_seq_create_kernel_client); 2274 2275 /* exported to kernel modules */ 2276 int snd_seq_delete_kernel_client(int client) 2277 { 2278 struct snd_seq_client *ptr; 2279 2280 if (snd_BUG_ON(in_interrupt())) 2281 return -EBUSY; 2282 2283 ptr = clientptr(client); 2284 if (ptr == NULL) 2285 return -EINVAL; 2286 2287 seq_free_client(ptr); 2288 kfree(ptr); 2289 return 0; 2290 } 2291 2292 EXPORT_SYMBOL(snd_seq_delete_kernel_client); 2293 2294 /* skeleton to enqueue event, called from snd_seq_kernel_client_enqueue 2295 * and snd_seq_kernel_client_enqueue_blocking 2296 */ 2297 static int kernel_client_enqueue(int client, struct snd_seq_event *ev, 2298 struct file *file, int blocking, 2299 int atomic, int hop) 2300 { 2301 struct snd_seq_client *cptr; 2302 int result; 2303 2304 if (snd_BUG_ON(!ev)) 2305 return -EINVAL; 2306 2307 if (ev->type == SNDRV_SEQ_EVENT_NONE) 2308 return 0; /* ignore this */ 2309 if (ev->type == SNDRV_SEQ_EVENT_KERNEL_ERROR) 2310 return -EINVAL; /* quoted events can't be enqueued */ 2311 2312 /* fill in client number */ 2313 ev->source.client = client; 2314 2315 if (check_event_type_and_length(ev)) 2316 return -EINVAL; 2317 2318 cptr = snd_seq_client_use_ptr(client); 2319 if (cptr == NULL) 2320 return -EINVAL; 2321 2322 if (! cptr->accept_output) 2323 result = -EPERM; 2324 else /* send it */ 2325 result = snd_seq_client_enqueue_event(cptr, ev, file, blocking, atomic, hop); 2326 2327 snd_seq_client_unlock(cptr); 2328 return result; 2329 } 2330 2331 /* 2332 * exported, called by kernel clients to enqueue events (w/o blocking) 2333 * 2334 * RETURN VALUE: zero if succeed, negative if error 2335 */ 2336 int snd_seq_kernel_client_enqueue(int client, struct snd_seq_event * ev, 2337 int atomic, int hop) 2338 { 2339 return kernel_client_enqueue(client, ev, NULL, 0, atomic, hop); 2340 } 2341 2342 EXPORT_SYMBOL(snd_seq_kernel_client_enqueue); 2343 2344 /* 2345 * exported, called by kernel clients to enqueue events (with blocking) 2346 * 2347 * RETURN VALUE: zero if succeed, negative if error 2348 */ 2349 int snd_seq_kernel_client_enqueue_blocking(int client, struct snd_seq_event * ev, 2350 struct file *file, 2351 int atomic, int hop) 2352 { 2353 return kernel_client_enqueue(client, ev, file, 1, atomic, hop); 2354 } 2355 2356 EXPORT_SYMBOL(snd_seq_kernel_client_enqueue_blocking); 2357 2358 /* 2359 * exported, called by kernel clients to dispatch events directly to other 2360 * clients, bypassing the queues. Event time-stamp will be updated. 2361 * 2362 * RETURN VALUE: negative = delivery failed, 2363 * zero, or positive: the number of delivered events 2364 */ 2365 int snd_seq_kernel_client_dispatch(int client, struct snd_seq_event * ev, 2366 int atomic, int hop) 2367 { 2368 struct snd_seq_client *cptr; 2369 int result; 2370 2371 if (snd_BUG_ON(!ev)) 2372 return -EINVAL; 2373 2374 /* fill in client number */ 2375 ev->queue = SNDRV_SEQ_QUEUE_DIRECT; 2376 ev->source.client = client; 2377 2378 if (check_event_type_and_length(ev)) 2379 return -EINVAL; 2380 2381 cptr = snd_seq_client_use_ptr(client); 2382 if (cptr == NULL) 2383 return -EINVAL; 2384 2385 if (!cptr->accept_output) 2386 result = -EPERM; 2387 else 2388 result = snd_seq_deliver_event(cptr, ev, atomic, hop); 2389 2390 snd_seq_client_unlock(cptr); 2391 return result; 2392 } 2393 2394 EXPORT_SYMBOL(snd_seq_kernel_client_dispatch); 2395 2396 /* 2397 * exported, called by kernel clients to perform same functions as with 2398 * userland ioctl() 2399 */ 2400 int snd_seq_kernel_client_ctl(int clientid, unsigned int cmd, void *arg) 2401 { 2402 struct snd_seq_client *client; 2403 mm_segment_t fs; 2404 int result; 2405 2406 client = clientptr(clientid); 2407 if (client == NULL) 2408 return -ENXIO; 2409 fs = snd_enter_user(); 2410 result = snd_seq_do_ioctl(client, cmd, (void __force __user *)arg); 2411 snd_leave_user(fs); 2412 return result; 2413 } 2414 2415 EXPORT_SYMBOL(snd_seq_kernel_client_ctl); 2416 2417 /* exported (for OSS emulator) */ 2418 int snd_seq_kernel_client_write_poll(int clientid, struct file *file, poll_table *wait) 2419 { 2420 struct snd_seq_client *client; 2421 2422 client = clientptr(clientid); 2423 if (client == NULL) 2424 return -ENXIO; 2425 2426 if (! snd_seq_write_pool_allocated(client)) 2427 return 1; 2428 if (snd_seq_pool_poll_wait(client->pool, file, wait)) 2429 return 1; 2430 return 0; 2431 } 2432 2433 EXPORT_SYMBOL(snd_seq_kernel_client_write_poll); 2434 2435 /*---------------------------------------------------------------------------*/ 2436 2437 #ifdef CONFIG_PROC_FS 2438 /* 2439 * /proc interface 2440 */ 2441 static void snd_seq_info_dump_subscribers(struct snd_info_buffer *buffer, 2442 struct snd_seq_port_subs_info *group, 2443 int is_src, char *msg) 2444 { 2445 struct list_head *p; 2446 struct snd_seq_subscribers *s; 2447 int count = 0; 2448 2449 down_read(&group->list_mutex); 2450 if (list_empty(&group->list_head)) { 2451 up_read(&group->list_mutex); 2452 return; 2453 } 2454 snd_iprintf(buffer, msg); 2455 list_for_each(p, &group->list_head) { 2456 if (is_src) 2457 s = list_entry(p, struct snd_seq_subscribers, src_list); 2458 else 2459 s = list_entry(p, struct snd_seq_subscribers, dest_list); 2460 if (count++) 2461 snd_iprintf(buffer, ", "); 2462 snd_iprintf(buffer, "%d:%d", 2463 is_src ? s->info.dest.client : s->info.sender.client, 2464 is_src ? s->info.dest.port : s->info.sender.port); 2465 if (s->info.flags & SNDRV_SEQ_PORT_SUBS_TIMESTAMP) 2466 snd_iprintf(buffer, "[%c:%d]", ((s->info.flags & SNDRV_SEQ_PORT_SUBS_TIME_REAL) ? 'r' : 't'), s->info.queue); 2467 if (group->exclusive) 2468 snd_iprintf(buffer, "[ex]"); 2469 } 2470 up_read(&group->list_mutex); 2471 snd_iprintf(buffer, "\n"); 2472 } 2473 2474 #define FLAG_PERM_RD(perm) ((perm) & SNDRV_SEQ_PORT_CAP_READ ? ((perm) & SNDRV_SEQ_PORT_CAP_SUBS_READ ? 'R' : 'r') : '-') 2475 #define FLAG_PERM_WR(perm) ((perm) & SNDRV_SEQ_PORT_CAP_WRITE ? ((perm) & SNDRV_SEQ_PORT_CAP_SUBS_WRITE ? 'W' : 'w') : '-') 2476 #define FLAG_PERM_EX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_NO_EXPORT ? '-' : 'e') 2477 2478 #define FLAG_PERM_DUPLEX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_DUPLEX ? 'X' : '-') 2479 2480 static void snd_seq_info_dump_ports(struct snd_info_buffer *buffer, 2481 struct snd_seq_client *client) 2482 { 2483 struct snd_seq_client_port *p; 2484 2485 mutex_lock(&client->ports_mutex); 2486 list_for_each_entry(p, &client->ports_list_head, list) { 2487 snd_iprintf(buffer, " Port %3d : \"%s\" (%c%c%c%c)\n", 2488 p->addr.port, p->name, 2489 FLAG_PERM_RD(p->capability), 2490 FLAG_PERM_WR(p->capability), 2491 FLAG_PERM_EX(p->capability), 2492 FLAG_PERM_DUPLEX(p->capability)); 2493 snd_seq_info_dump_subscribers(buffer, &p->c_src, 1, " Connecting To: "); 2494 snd_seq_info_dump_subscribers(buffer, &p->c_dest, 0, " Connected From: "); 2495 } 2496 mutex_unlock(&client->ports_mutex); 2497 } 2498 2499 2500 /* exported to seq_info.c */ 2501 void snd_seq_info_clients_read(struct snd_info_entry *entry, 2502 struct snd_info_buffer *buffer) 2503 { 2504 int c; 2505 struct snd_seq_client *client; 2506 2507 snd_iprintf(buffer, "Client info\n"); 2508 snd_iprintf(buffer, " cur clients : %d\n", client_usage.cur); 2509 snd_iprintf(buffer, " peak clients : %d\n", client_usage.peak); 2510 snd_iprintf(buffer, " max clients : %d\n", SNDRV_SEQ_MAX_CLIENTS); 2511 snd_iprintf(buffer, "\n"); 2512 2513 /* list the client table */ 2514 for (c = 0; c < SNDRV_SEQ_MAX_CLIENTS; c++) { 2515 client = snd_seq_client_use_ptr(c); 2516 if (client == NULL) 2517 continue; 2518 if (client->type == NO_CLIENT) { 2519 snd_seq_client_unlock(client); 2520 continue; 2521 } 2522 2523 snd_iprintf(buffer, "Client %3d : \"%s\" [%s]\n", 2524 c, client->name, 2525 client->type == USER_CLIENT ? "User" : "Kernel"); 2526 snd_seq_info_dump_ports(buffer, client); 2527 if (snd_seq_write_pool_allocated(client)) { 2528 snd_iprintf(buffer, " Output pool :\n"); 2529 snd_seq_info_pool(buffer, client->pool, " "); 2530 } 2531 if (client->type == USER_CLIENT && client->data.user.fifo && 2532 client->data.user.fifo->pool) { 2533 snd_iprintf(buffer, " Input pool :\n"); 2534 snd_seq_info_pool(buffer, client->data.user.fifo->pool, " "); 2535 } 2536 snd_seq_client_unlock(client); 2537 } 2538 } 2539 #endif /* CONFIG_PROC_FS */ 2540 2541 /*---------------------------------------------------------------------------*/ 2542 2543 2544 /* 2545 * REGISTRATION PART 2546 */ 2547 2548 static const struct file_operations snd_seq_f_ops = 2549 { 2550 .owner = THIS_MODULE, 2551 .read = snd_seq_read, 2552 .write = snd_seq_write, 2553 .open = snd_seq_open, 2554 .release = snd_seq_release, 2555 .llseek = no_llseek, 2556 .poll = snd_seq_poll, 2557 .unlocked_ioctl = snd_seq_ioctl, 2558 .compat_ioctl = snd_seq_ioctl_compat, 2559 }; 2560 2561 /* 2562 * register sequencer device 2563 */ 2564 int __init snd_sequencer_device_init(void) 2565 { 2566 int err; 2567 2568 if (mutex_lock_interruptible(®ister_mutex)) 2569 return -ERESTARTSYS; 2570 2571 if ((err = snd_register_device(SNDRV_DEVICE_TYPE_SEQUENCER, NULL, 0, 2572 &snd_seq_f_ops, NULL, "seq")) < 0) { 2573 mutex_unlock(®ister_mutex); 2574 return err; 2575 } 2576 2577 mutex_unlock(®ister_mutex); 2578 2579 return 0; 2580 } 2581 2582 2583 2584 /* 2585 * unregister sequencer device 2586 */ 2587 void __exit snd_sequencer_device_done(void) 2588 { 2589 snd_unregister_device(SNDRV_DEVICE_TYPE_SEQUENCER, NULL, 0); 2590 } 2591