1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * ALSA sequencer Client Manager 4 * Copyright (c) 1998-2001 by Frank van de Pol <fvdpol@coil.demon.nl> 5 * Jaroslav Kysela <perex@perex.cz> 6 * Takashi Iwai <tiwai@suse.de> 7 */ 8 9 #include <linux/init.h> 10 #include <linux/export.h> 11 #include <linux/slab.h> 12 #include <sound/core.h> 13 #include <sound/minors.h> 14 #include <linux/kmod.h> 15 16 #include <sound/seq_kernel.h> 17 #include <sound/ump.h> 18 #include "seq_clientmgr.h" 19 #include "seq_memory.h" 20 #include "seq_queue.h" 21 #include "seq_timer.h" 22 #include "seq_info.h" 23 #include "seq_system.h" 24 #include "seq_ump_convert.h" 25 #include <sound/seq_device.h> 26 #ifdef CONFIG_COMPAT 27 #include <linux/compat.h> 28 #endif 29 30 /* Client Manager 31 32 * this module handles the connections of userland and kernel clients 33 * 34 */ 35 36 /* 37 * There are four ranges of client numbers (last two shared): 38 * 0..15: global clients 39 * 16..127: statically allocated client numbers for cards 0..27 40 * 128..191: dynamically allocated client numbers for cards 28..31 41 * 128..191: dynamically allocated client numbers for applications 42 */ 43 44 /* number of kernel non-card clients */ 45 #define SNDRV_SEQ_GLOBAL_CLIENTS 16 46 /* clients per cards, for static clients */ 47 #define SNDRV_SEQ_CLIENTS_PER_CARD 4 48 /* dynamically allocated client numbers (both kernel drivers and user space) */ 49 #define SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN 128 50 51 #define SNDRV_SEQ_LFLG_INPUT 0x0001 52 #define SNDRV_SEQ_LFLG_OUTPUT 0x0002 53 #define SNDRV_SEQ_LFLG_OPEN (SNDRV_SEQ_LFLG_INPUT|SNDRV_SEQ_LFLG_OUTPUT) 54 55 static DEFINE_SPINLOCK(clients_lock); 56 static DEFINE_MUTEX(register_mutex); 57 58 /* 59 * client table 60 */ 61 static char clienttablock[SNDRV_SEQ_MAX_CLIENTS]; 62 static struct snd_seq_client *clienttab[SNDRV_SEQ_MAX_CLIENTS]; 63 static struct snd_seq_usage client_usage; 64 65 /* 66 * prototypes 67 */ 68 static int bounce_error_event(struct snd_seq_client *client, 69 struct snd_seq_event *event, 70 int err, int atomic, int hop); 71 static int snd_seq_deliver_single_event(struct snd_seq_client *client, 72 struct snd_seq_event *event, 73 int filter, int atomic, int hop); 74 75 #if IS_ENABLED(CONFIG_SND_SEQ_UMP) 76 static void free_ump_info(struct snd_seq_client *client); 77 #endif 78 79 /* 80 */ 81 static inline unsigned short snd_seq_file_flags(struct file *file) 82 { 83 switch (file->f_mode & (FMODE_READ | FMODE_WRITE)) { 84 case FMODE_WRITE: 85 return SNDRV_SEQ_LFLG_OUTPUT; 86 case FMODE_READ: 87 return SNDRV_SEQ_LFLG_INPUT; 88 default: 89 return SNDRV_SEQ_LFLG_OPEN; 90 } 91 } 92 93 static inline int snd_seq_write_pool_allocated(struct snd_seq_client *client) 94 { 95 return snd_seq_total_cells(client->pool) > 0; 96 } 97 98 /* return pointer to client structure for specified id */ 99 static struct snd_seq_client *clientptr(int clientid) 100 { 101 if (clientid < 0 || clientid >= SNDRV_SEQ_MAX_CLIENTS) { 102 pr_debug("ALSA: seq: oops. Trying to get pointer to client %d\n", 103 clientid); 104 return NULL; 105 } 106 return clienttab[clientid]; 107 } 108 109 struct snd_seq_client *snd_seq_client_use_ptr(int clientid) 110 { 111 unsigned long flags; 112 struct snd_seq_client *client; 113 114 if (clientid < 0 || clientid >= SNDRV_SEQ_MAX_CLIENTS) { 115 pr_debug("ALSA: seq: oops. Trying to get pointer to client %d\n", 116 clientid); 117 return NULL; 118 } 119 spin_lock_irqsave(&clients_lock, flags); 120 client = clientptr(clientid); 121 if (client) 122 goto __lock; 123 if (clienttablock[clientid]) { 124 spin_unlock_irqrestore(&clients_lock, flags); 125 return NULL; 126 } 127 spin_unlock_irqrestore(&clients_lock, flags); 128 #ifdef CONFIG_MODULES 129 if (!in_interrupt()) { 130 static DECLARE_BITMAP(client_requested, SNDRV_SEQ_GLOBAL_CLIENTS); 131 static DECLARE_BITMAP(card_requested, SNDRV_CARDS); 132 133 if (clientid < SNDRV_SEQ_GLOBAL_CLIENTS) { 134 int idx; 135 136 if (!test_and_set_bit(clientid, client_requested)) { 137 for (idx = 0; idx < 15; idx++) { 138 if (seq_client_load[idx] < 0) 139 break; 140 if (seq_client_load[idx] == clientid) { 141 request_module("snd-seq-client-%i", 142 clientid); 143 break; 144 } 145 } 146 } 147 } else if (clientid < SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN) { 148 int card = (clientid - SNDRV_SEQ_GLOBAL_CLIENTS) / 149 SNDRV_SEQ_CLIENTS_PER_CARD; 150 if (card < snd_ecards_limit) { 151 if (!test_and_set_bit(card, card_requested)) 152 snd_request_card(card); 153 snd_seq_device_load_drivers(); 154 } 155 } 156 spin_lock_irqsave(&clients_lock, flags); 157 client = clientptr(clientid); 158 if (client) 159 goto __lock; 160 spin_unlock_irqrestore(&clients_lock, flags); 161 } 162 #endif 163 return NULL; 164 165 __lock: 166 snd_use_lock_use(&client->use_lock); 167 spin_unlock_irqrestore(&clients_lock, flags); 168 return client; 169 } 170 171 /* Take refcount and perform ioctl_mutex lock on the given client; 172 * used only for OSS sequencer 173 * Unlock via snd_seq_client_ioctl_unlock() below 174 */ 175 bool snd_seq_client_ioctl_lock(int clientid) 176 { 177 struct snd_seq_client *client; 178 179 client = snd_seq_client_use_ptr(clientid); 180 if (!client) 181 return false; 182 mutex_lock(&client->ioctl_mutex); 183 /* The client isn't unrefed here; see snd_seq_client_ioctl_unlock() */ 184 return true; 185 } 186 EXPORT_SYMBOL_GPL(snd_seq_client_ioctl_lock); 187 188 /* Unlock and unref the given client; for OSS sequencer use only */ 189 void snd_seq_client_ioctl_unlock(int clientid) 190 { 191 struct snd_seq_client *client; 192 193 client = snd_seq_client_use_ptr(clientid); 194 if (WARN_ON(!client)) 195 return; 196 mutex_unlock(&client->ioctl_mutex); 197 /* The doubly unrefs below are intentional; the first one releases the 198 * leftover from snd_seq_client_ioctl_lock() above, and the second one 199 * is for releasing snd_seq_client_use_ptr() in this function 200 */ 201 snd_seq_client_unlock(client); 202 snd_seq_client_unlock(client); 203 } 204 EXPORT_SYMBOL_GPL(snd_seq_client_ioctl_unlock); 205 206 static void usage_alloc(struct snd_seq_usage *res, int num) 207 { 208 res->cur += num; 209 if (res->cur > res->peak) 210 res->peak = res->cur; 211 } 212 213 static void usage_free(struct snd_seq_usage *res, int num) 214 { 215 res->cur -= num; 216 } 217 218 /* initialise data structures */ 219 int __init client_init_data(void) 220 { 221 /* zap out the client table */ 222 memset(&clienttablock, 0, sizeof(clienttablock)); 223 memset(&clienttab, 0, sizeof(clienttab)); 224 return 0; 225 } 226 227 228 static struct snd_seq_client *seq_create_client1(int client_index, int poolsize) 229 { 230 int c; 231 struct snd_seq_client *client; 232 233 /* init client data */ 234 client = kzalloc(sizeof(*client), GFP_KERNEL); 235 if (client == NULL) 236 return NULL; 237 client->pool = snd_seq_pool_new(poolsize); 238 if (client->pool == NULL) { 239 kfree(client); 240 return NULL; 241 } 242 client->type = NO_CLIENT; 243 snd_use_lock_init(&client->use_lock); 244 rwlock_init(&client->ports_lock); 245 mutex_init(&client->ports_mutex); 246 INIT_LIST_HEAD(&client->ports_list_head); 247 mutex_init(&client->ioctl_mutex); 248 client->ump_endpoint_port = -1; 249 250 /* find free slot in the client table */ 251 spin_lock_irq(&clients_lock); 252 if (client_index < 0) { 253 for (c = SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN; 254 c < SNDRV_SEQ_MAX_CLIENTS; 255 c++) { 256 if (clienttab[c] || clienttablock[c]) 257 continue; 258 clienttab[client->number = c] = client; 259 spin_unlock_irq(&clients_lock); 260 return client; 261 } 262 } else { 263 if (clienttab[client_index] == NULL && !clienttablock[client_index]) { 264 clienttab[client->number = client_index] = client; 265 spin_unlock_irq(&clients_lock); 266 return client; 267 } 268 } 269 spin_unlock_irq(&clients_lock); 270 snd_seq_pool_delete(&client->pool); 271 kfree(client); 272 return NULL; /* no free slot found or busy, return failure code */ 273 } 274 275 276 static int seq_free_client1(struct snd_seq_client *client) 277 { 278 if (!client) 279 return 0; 280 spin_lock_irq(&clients_lock); 281 clienttablock[client->number] = 1; 282 clienttab[client->number] = NULL; 283 spin_unlock_irq(&clients_lock); 284 snd_seq_delete_all_ports(client); 285 snd_seq_queue_client_leave(client->number); 286 snd_use_lock_sync(&client->use_lock); 287 if (client->pool) 288 snd_seq_pool_delete(&client->pool); 289 spin_lock_irq(&clients_lock); 290 clienttablock[client->number] = 0; 291 spin_unlock_irq(&clients_lock); 292 return 0; 293 } 294 295 296 static void seq_free_client(struct snd_seq_client * client) 297 { 298 mutex_lock(®ister_mutex); 299 switch (client->type) { 300 case NO_CLIENT: 301 pr_warn("ALSA: seq: Trying to free unused client %d\n", 302 client->number); 303 break; 304 case USER_CLIENT: 305 case KERNEL_CLIENT: 306 seq_free_client1(client); 307 usage_free(&client_usage, 1); 308 break; 309 310 default: 311 pr_err("ALSA: seq: Trying to free client %d with undefined type = %d\n", 312 client->number, client->type); 313 } 314 mutex_unlock(®ister_mutex); 315 316 snd_seq_system_client_ev_client_exit(client->number); 317 } 318 319 320 321 /* -------------------------------------------------------- */ 322 323 /* create a user client */ 324 static int snd_seq_open(struct inode *inode, struct file *file) 325 { 326 int c, mode; /* client id */ 327 struct snd_seq_client *client; 328 struct snd_seq_user_client *user; 329 int err; 330 331 err = stream_open(inode, file); 332 if (err < 0) 333 return err; 334 335 mutex_lock(®ister_mutex); 336 client = seq_create_client1(-1, SNDRV_SEQ_DEFAULT_EVENTS); 337 if (!client) { 338 mutex_unlock(®ister_mutex); 339 return -ENOMEM; /* failure code */ 340 } 341 342 mode = snd_seq_file_flags(file); 343 if (mode & SNDRV_SEQ_LFLG_INPUT) 344 client->accept_input = 1; 345 if (mode & SNDRV_SEQ_LFLG_OUTPUT) 346 client->accept_output = 1; 347 348 user = &client->data.user; 349 user->fifo = NULL; 350 user->fifo_pool_size = 0; 351 352 if (mode & SNDRV_SEQ_LFLG_INPUT) { 353 user->fifo_pool_size = SNDRV_SEQ_DEFAULT_CLIENT_EVENTS; 354 user->fifo = snd_seq_fifo_new(user->fifo_pool_size); 355 if (user->fifo == NULL) { 356 seq_free_client1(client); 357 kfree(client); 358 mutex_unlock(®ister_mutex); 359 return -ENOMEM; 360 } 361 } 362 363 usage_alloc(&client_usage, 1); 364 client->type = USER_CLIENT; 365 mutex_unlock(®ister_mutex); 366 367 c = client->number; 368 file->private_data = client; 369 370 /* fill client data */ 371 user->file = file; 372 sprintf(client->name, "Client-%d", c); 373 client->data.user.owner = get_pid(task_pid(current)); 374 375 /* make others aware this new client */ 376 snd_seq_system_client_ev_client_start(c); 377 378 return 0; 379 } 380 381 /* delete a user client */ 382 static int snd_seq_release(struct inode *inode, struct file *file) 383 { 384 struct snd_seq_client *client = file->private_data; 385 386 if (client) { 387 seq_free_client(client); 388 if (client->data.user.fifo) 389 snd_seq_fifo_delete(&client->data.user.fifo); 390 #if IS_ENABLED(CONFIG_SND_SEQ_UMP) 391 free_ump_info(client); 392 #endif 393 put_pid(client->data.user.owner); 394 kfree(client); 395 } 396 397 return 0; 398 } 399 400 static bool event_is_compatible(const struct snd_seq_client *client, 401 const struct snd_seq_event *ev) 402 { 403 if (snd_seq_ev_is_ump(ev) && !client->midi_version) 404 return false; 405 if (snd_seq_ev_is_ump(ev) && snd_seq_ev_is_variable(ev)) 406 return false; 407 return true; 408 } 409 410 /* handle client read() */ 411 /* possible error values: 412 * -ENXIO invalid client or file open mode 413 * -ENOSPC FIFO overflow (the flag is cleared after this error report) 414 * -EINVAL no enough user-space buffer to write the whole event 415 * -EFAULT seg. fault during copy to user space 416 */ 417 static ssize_t snd_seq_read(struct file *file, char __user *buf, size_t count, 418 loff_t *offset) 419 { 420 struct snd_seq_client *client = file->private_data; 421 struct snd_seq_fifo *fifo; 422 size_t aligned_size; 423 int err; 424 long result = 0; 425 struct snd_seq_event_cell *cell; 426 427 if (!(snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_INPUT)) 428 return -ENXIO; 429 430 if (!access_ok(buf, count)) 431 return -EFAULT; 432 433 /* check client structures are in place */ 434 if (snd_BUG_ON(!client)) 435 return -ENXIO; 436 437 if (!client->accept_input) 438 return -ENXIO; 439 fifo = client->data.user.fifo; 440 if (!fifo) 441 return -ENXIO; 442 443 if (atomic_read(&fifo->overflow) > 0) { 444 /* buffer overflow is detected */ 445 snd_seq_fifo_clear(fifo); 446 /* return error code */ 447 return -ENOSPC; 448 } 449 450 cell = NULL; 451 err = 0; 452 snd_seq_fifo_lock(fifo); 453 454 if (IS_ENABLED(CONFIG_SND_SEQ_UMP) && client->midi_version > 0) 455 aligned_size = sizeof(struct snd_seq_ump_event); 456 else 457 aligned_size = sizeof(struct snd_seq_event); 458 459 /* while data available in queue */ 460 while (count >= aligned_size) { 461 int nonblock; 462 463 nonblock = (file->f_flags & O_NONBLOCK) || result > 0; 464 err = snd_seq_fifo_cell_out(fifo, &cell, nonblock); 465 if (err < 0) 466 break; 467 if (!event_is_compatible(client, &cell->event)) { 468 snd_seq_cell_free(cell); 469 cell = NULL; 470 continue; 471 } 472 if (snd_seq_ev_is_variable(&cell->event)) { 473 struct snd_seq_ump_event tmpev; 474 475 memcpy(&tmpev, &cell->event, aligned_size); 476 tmpev.data.ext.len &= ~SNDRV_SEQ_EXT_MASK; 477 if (copy_to_user(buf, &tmpev, aligned_size)) { 478 err = -EFAULT; 479 break; 480 } 481 count -= aligned_size; 482 buf += aligned_size; 483 err = snd_seq_expand_var_event(&cell->event, count, 484 (char __force *)buf, 0, 485 aligned_size); 486 if (err < 0) 487 break; 488 result += err; 489 count -= err; 490 buf += err; 491 } else { 492 if (copy_to_user(buf, &cell->event, aligned_size)) { 493 err = -EFAULT; 494 break; 495 } 496 count -= aligned_size; 497 buf += aligned_size; 498 } 499 snd_seq_cell_free(cell); 500 cell = NULL; /* to be sure */ 501 result += aligned_size; 502 } 503 504 if (err < 0) { 505 if (cell) 506 snd_seq_fifo_cell_putback(fifo, cell); 507 if (err == -EAGAIN && result > 0) 508 err = 0; 509 } 510 snd_seq_fifo_unlock(fifo); 511 512 return (err < 0) ? err : result; 513 } 514 515 516 /* 517 * check access permission to the port 518 */ 519 static int check_port_perm(struct snd_seq_client_port *port, unsigned int flags) 520 { 521 if ((port->capability & flags) != flags) 522 return 0; 523 return flags; 524 } 525 526 /* 527 * check if the destination client is available, and return the pointer 528 * if filter is non-zero, client filter bitmap is tested. 529 */ 530 static struct snd_seq_client *get_event_dest_client(struct snd_seq_event *event, 531 int filter) 532 { 533 struct snd_seq_client *dest; 534 535 dest = snd_seq_client_use_ptr(event->dest.client); 536 if (dest == NULL) 537 return NULL; 538 if (! dest->accept_input) 539 goto __not_avail; 540 if ((dest->filter & SNDRV_SEQ_FILTER_USE_EVENT) && 541 ! test_bit(event->type, dest->event_filter)) 542 goto __not_avail; 543 if (filter && !(dest->filter & filter)) 544 goto __not_avail; 545 546 return dest; /* ok - accessible */ 547 __not_avail: 548 snd_seq_client_unlock(dest); 549 return NULL; 550 } 551 552 553 /* 554 * Return the error event. 555 * 556 * If the receiver client is a user client, the original event is 557 * encapsulated in SNDRV_SEQ_EVENT_BOUNCE as variable length event. If 558 * the original event is also variable length, the external data is 559 * copied after the event record. 560 * If the receiver client is a kernel client, the original event is 561 * quoted in SNDRV_SEQ_EVENT_KERNEL_ERROR, since this requires no extra 562 * kmalloc. 563 */ 564 static int bounce_error_event(struct snd_seq_client *client, 565 struct snd_seq_event *event, 566 int err, int atomic, int hop) 567 { 568 struct snd_seq_event bounce_ev; 569 int result; 570 571 if (client == NULL || 572 ! (client->filter & SNDRV_SEQ_FILTER_BOUNCE) || 573 ! client->accept_input) 574 return 0; /* ignored */ 575 576 /* set up quoted error */ 577 memset(&bounce_ev, 0, sizeof(bounce_ev)); 578 bounce_ev.type = SNDRV_SEQ_EVENT_KERNEL_ERROR; 579 bounce_ev.flags = SNDRV_SEQ_EVENT_LENGTH_FIXED; 580 bounce_ev.queue = SNDRV_SEQ_QUEUE_DIRECT; 581 bounce_ev.source.client = SNDRV_SEQ_CLIENT_SYSTEM; 582 bounce_ev.source.port = SNDRV_SEQ_PORT_SYSTEM_ANNOUNCE; 583 bounce_ev.dest.client = client->number; 584 bounce_ev.dest.port = event->source.port; 585 bounce_ev.data.quote.origin = event->dest; 586 bounce_ev.data.quote.event = event; 587 bounce_ev.data.quote.value = -err; /* use positive value */ 588 result = snd_seq_deliver_single_event(NULL, &bounce_ev, 0, atomic, hop + 1); 589 if (result < 0) { 590 client->event_lost++; 591 return result; 592 } 593 594 return result; 595 } 596 597 598 /* 599 * rewrite the time-stamp of the event record with the curren time 600 * of the given queue. 601 * return non-zero if updated. 602 */ 603 static int update_timestamp_of_queue(struct snd_seq_event *event, 604 int queue, int real_time) 605 { 606 struct snd_seq_queue *q; 607 608 q = queueptr(queue); 609 if (! q) 610 return 0; 611 event->queue = queue; 612 event->flags &= ~SNDRV_SEQ_TIME_STAMP_MASK; 613 if (real_time) { 614 event->time.time = snd_seq_timer_get_cur_time(q->timer, true); 615 event->flags |= SNDRV_SEQ_TIME_STAMP_REAL; 616 } else { 617 event->time.tick = snd_seq_timer_get_cur_tick(q->timer); 618 event->flags |= SNDRV_SEQ_TIME_STAMP_TICK; 619 } 620 queuefree(q); 621 return 1; 622 } 623 624 /* deliver a single event; called from below and UMP converter */ 625 int __snd_seq_deliver_single_event(struct snd_seq_client *dest, 626 struct snd_seq_client_port *dest_port, 627 struct snd_seq_event *event, 628 int atomic, int hop) 629 { 630 switch (dest->type) { 631 case USER_CLIENT: 632 if (!dest->data.user.fifo) 633 return 0; 634 return snd_seq_fifo_event_in(dest->data.user.fifo, event); 635 case KERNEL_CLIENT: 636 if (!dest_port->event_input) 637 return 0; 638 return dest_port->event_input(event, 639 snd_seq_ev_is_direct(event), 640 dest_port->private_data, 641 atomic, hop); 642 } 643 return 0; 644 } 645 646 /* 647 * deliver an event to the specified destination. 648 * if filter is non-zero, client filter bitmap is tested. 649 * 650 * RETURN VALUE: 0 : if succeeded 651 * <0 : error 652 */ 653 static int snd_seq_deliver_single_event(struct snd_seq_client *client, 654 struct snd_seq_event *event, 655 int filter, int atomic, int hop) 656 { 657 struct snd_seq_client *dest = NULL; 658 struct snd_seq_client_port *dest_port = NULL; 659 int result = -ENOENT; 660 int direct; 661 662 direct = snd_seq_ev_is_direct(event); 663 664 dest = get_event_dest_client(event, filter); 665 if (dest == NULL) 666 goto __skip; 667 dest_port = snd_seq_port_use_ptr(dest, event->dest.port); 668 if (dest_port == NULL) 669 goto __skip; 670 671 /* check permission */ 672 if (! check_port_perm(dest_port, SNDRV_SEQ_PORT_CAP_WRITE)) { 673 result = -EPERM; 674 goto __skip; 675 } 676 677 if (dest_port->timestamping) 678 update_timestamp_of_queue(event, dest_port->time_queue, 679 dest_port->time_real); 680 681 #if IS_ENABLED(CONFIG_SND_SEQ_UMP) 682 if (!(dest->filter & SNDRV_SEQ_FILTER_NO_CONVERT)) { 683 if (snd_seq_ev_is_ump(event)) { 684 result = snd_seq_deliver_from_ump(client, dest, dest_port, 685 event, atomic, hop); 686 goto __skip; 687 } else if (snd_seq_client_is_ump(dest)) { 688 result = snd_seq_deliver_to_ump(client, dest, dest_port, 689 event, atomic, hop); 690 goto __skip; 691 } 692 } 693 #endif /* CONFIG_SND_SEQ_UMP */ 694 695 result = __snd_seq_deliver_single_event(dest, dest_port, event, 696 atomic, hop); 697 698 __skip: 699 if (dest_port) 700 snd_seq_port_unlock(dest_port); 701 if (dest) 702 snd_seq_client_unlock(dest); 703 704 if (result < 0 && !direct) { 705 result = bounce_error_event(client, event, result, atomic, hop); 706 } 707 return result; 708 } 709 710 711 /* 712 * send the event to all subscribers: 713 */ 714 static int __deliver_to_subscribers(struct snd_seq_client *client, 715 struct snd_seq_event *event, 716 struct snd_seq_client_port *src_port, 717 int atomic, int hop) 718 { 719 struct snd_seq_subscribers *subs; 720 int err, result = 0, num_ev = 0; 721 union __snd_seq_event event_saved; 722 size_t saved_size; 723 struct snd_seq_port_subs_info *grp; 724 725 /* save original event record */ 726 saved_size = snd_seq_event_packet_size(event); 727 memcpy(&event_saved, event, saved_size); 728 grp = &src_port->c_src; 729 730 /* lock list */ 731 if (atomic) 732 read_lock(&grp->list_lock); 733 else 734 down_read_nested(&grp->list_mutex, hop); 735 list_for_each_entry(subs, &grp->list_head, src_list) { 736 /* both ports ready? */ 737 if (atomic_read(&subs->ref_count) != 2) 738 continue; 739 event->dest = subs->info.dest; 740 if (subs->info.flags & SNDRV_SEQ_PORT_SUBS_TIMESTAMP) 741 /* convert time according to flag with subscription */ 742 update_timestamp_of_queue(event, subs->info.queue, 743 subs->info.flags & SNDRV_SEQ_PORT_SUBS_TIME_REAL); 744 err = snd_seq_deliver_single_event(client, event, 745 0, atomic, hop); 746 if (err < 0) { 747 /* save first error that occurs and continue */ 748 if (!result) 749 result = err; 750 continue; 751 } 752 num_ev++; 753 /* restore original event record */ 754 memcpy(event, &event_saved, saved_size); 755 } 756 if (atomic) 757 read_unlock(&grp->list_lock); 758 else 759 up_read(&grp->list_mutex); 760 memcpy(event, &event_saved, saved_size); 761 return (result < 0) ? result : num_ev; 762 } 763 764 static int deliver_to_subscribers(struct snd_seq_client *client, 765 struct snd_seq_event *event, 766 int atomic, int hop) 767 { 768 struct snd_seq_client_port *src_port; 769 int ret = 0, ret2; 770 771 src_port = snd_seq_port_use_ptr(client, event->source.port); 772 if (src_port) { 773 ret = __deliver_to_subscribers(client, event, src_port, atomic, hop); 774 snd_seq_port_unlock(src_port); 775 } 776 777 if (client->ump_endpoint_port < 0 || 778 event->source.port == client->ump_endpoint_port) 779 return ret; 780 781 src_port = snd_seq_port_use_ptr(client, client->ump_endpoint_port); 782 if (!src_port) 783 return ret; 784 ret2 = __deliver_to_subscribers(client, event, src_port, atomic, hop); 785 snd_seq_port_unlock(src_port); 786 return ret2 < 0 ? ret2 : ret; 787 } 788 789 /* deliver an event to the destination port(s). 790 * if the event is to subscribers or broadcast, the event is dispatched 791 * to multiple targets. 792 * 793 * RETURN VALUE: n > 0 : the number of delivered events. 794 * n == 0 : the event was not passed to any client. 795 * n < 0 : error - event was not processed. 796 */ 797 static int snd_seq_deliver_event(struct snd_seq_client *client, struct snd_seq_event *event, 798 int atomic, int hop) 799 { 800 int result; 801 802 hop++; 803 if (hop >= SNDRV_SEQ_MAX_HOPS) { 804 pr_debug("ALSA: seq: too long delivery path (%d:%d->%d:%d)\n", 805 event->source.client, event->source.port, 806 event->dest.client, event->dest.port); 807 return -EMLINK; 808 } 809 810 if (snd_seq_ev_is_variable(event) && 811 snd_BUG_ON(atomic && (event->data.ext.len & SNDRV_SEQ_EXT_USRPTR))) 812 return -EINVAL; 813 814 if (event->queue == SNDRV_SEQ_ADDRESS_SUBSCRIBERS || 815 event->dest.client == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) 816 result = deliver_to_subscribers(client, event, atomic, hop); 817 else 818 result = snd_seq_deliver_single_event(client, event, 0, atomic, hop); 819 820 return result; 821 } 822 823 /* 824 * dispatch an event cell: 825 * This function is called only from queue check routines in timer 826 * interrupts or after enqueued. 827 * The event cell shall be released or re-queued in this function. 828 * 829 * RETURN VALUE: n > 0 : the number of delivered events. 830 * n == 0 : the event was not passed to any client. 831 * n < 0 : error - event was not processed. 832 */ 833 int snd_seq_dispatch_event(struct snd_seq_event_cell *cell, int atomic, int hop) 834 { 835 struct snd_seq_client *client; 836 int result; 837 838 if (snd_BUG_ON(!cell)) 839 return -EINVAL; 840 841 client = snd_seq_client_use_ptr(cell->event.source.client); 842 if (client == NULL) { 843 snd_seq_cell_free(cell); /* release this cell */ 844 return -EINVAL; 845 } 846 847 if (!snd_seq_ev_is_ump(&cell->event) && 848 cell->event.type == SNDRV_SEQ_EVENT_NOTE) { 849 /* NOTE event: 850 * the event cell is re-used as a NOTE-OFF event and 851 * enqueued again. 852 */ 853 struct snd_seq_event tmpev, *ev; 854 855 /* reserve this event to enqueue note-off later */ 856 tmpev = cell->event; 857 tmpev.type = SNDRV_SEQ_EVENT_NOTEON; 858 result = snd_seq_deliver_event(client, &tmpev, atomic, hop); 859 860 /* 861 * This was originally a note event. We now re-use the 862 * cell for the note-off event. 863 */ 864 865 ev = &cell->event; 866 ev->type = SNDRV_SEQ_EVENT_NOTEOFF; 867 ev->flags |= SNDRV_SEQ_PRIORITY_HIGH; 868 869 /* add the duration time */ 870 switch (ev->flags & SNDRV_SEQ_TIME_STAMP_MASK) { 871 case SNDRV_SEQ_TIME_STAMP_TICK: 872 cell->event.time.tick += ev->data.note.duration; 873 break; 874 case SNDRV_SEQ_TIME_STAMP_REAL: 875 /* unit for duration is ms */ 876 ev->time.time.tv_nsec += 1000000 * (ev->data.note.duration % 1000); 877 ev->time.time.tv_sec += ev->data.note.duration / 1000 + 878 ev->time.time.tv_nsec / 1000000000; 879 ev->time.time.tv_nsec %= 1000000000; 880 break; 881 } 882 ev->data.note.velocity = ev->data.note.off_velocity; 883 884 /* Now queue this cell as the note off event */ 885 if (snd_seq_enqueue_event(cell, atomic, hop) < 0) 886 snd_seq_cell_free(cell); /* release this cell */ 887 888 } else { 889 /* Normal events: 890 * event cell is freed after processing the event 891 */ 892 893 result = snd_seq_deliver_event(client, &cell->event, atomic, hop); 894 snd_seq_cell_free(cell); 895 } 896 897 snd_seq_client_unlock(client); 898 return result; 899 } 900 901 902 /* Allocate a cell from client pool and enqueue it to queue: 903 * if pool is empty and blocking is TRUE, sleep until a new cell is 904 * available. 905 */ 906 static int snd_seq_client_enqueue_event(struct snd_seq_client *client, 907 struct snd_seq_event *event, 908 struct file *file, int blocking, 909 int atomic, int hop, 910 struct mutex *mutexp) 911 { 912 struct snd_seq_event_cell *cell; 913 int err; 914 915 /* special queue values - force direct passing */ 916 if (event->queue == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) { 917 event->dest.client = SNDRV_SEQ_ADDRESS_SUBSCRIBERS; 918 event->queue = SNDRV_SEQ_QUEUE_DIRECT; 919 } else if (event->dest.client == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) { 920 /* check presence of source port */ 921 struct snd_seq_client_port *src_port = snd_seq_port_use_ptr(client, event->source.port); 922 if (src_port == NULL) 923 return -EINVAL; 924 snd_seq_port_unlock(src_port); 925 } 926 927 /* direct event processing without enqueued */ 928 if (snd_seq_ev_is_direct(event)) { 929 if (!snd_seq_ev_is_ump(event) && 930 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, 943 file, mutexp); 944 if (err < 0) 945 return err; 946 947 /* we got a cell. enqueue it. */ 948 err = snd_seq_enqueue_event(cell, atomic, hop); 949 if (err < 0) { 950 snd_seq_cell_free(cell); 951 return err; 952 } 953 954 return 0; 955 } 956 957 958 /* 959 * check validity of event type and data length. 960 * return non-zero if invalid. 961 */ 962 static int check_event_type_and_length(struct snd_seq_event *ev) 963 { 964 switch (snd_seq_ev_length_type(ev)) { 965 case SNDRV_SEQ_EVENT_LENGTH_FIXED: 966 if (snd_seq_ev_is_variable_type(ev)) 967 return -EINVAL; 968 break; 969 case SNDRV_SEQ_EVENT_LENGTH_VARIABLE: 970 if (! snd_seq_ev_is_variable_type(ev) || 971 (ev->data.ext.len & ~SNDRV_SEQ_EXT_MASK) >= SNDRV_SEQ_MAX_EVENT_LEN) 972 return -EINVAL; 973 break; 974 case SNDRV_SEQ_EVENT_LENGTH_VARUSR: 975 if (! snd_seq_ev_is_direct(ev)) 976 return -EINVAL; 977 break; 978 } 979 return 0; 980 } 981 982 983 /* handle write() */ 984 /* possible error values: 985 * -ENXIO invalid client or file open mode 986 * -ENOMEM malloc failed 987 * -EFAULT seg. fault during copy from user space 988 * -EINVAL invalid event 989 * -EAGAIN no space in output pool 990 * -EINTR interrupts while sleep 991 * -EMLINK too many hops 992 * others depends on return value from driver callback 993 */ 994 static ssize_t snd_seq_write(struct file *file, const char __user *buf, 995 size_t count, loff_t *offset) 996 { 997 struct snd_seq_client *client = file->private_data; 998 int written = 0, len; 999 int err, handled; 1000 union __snd_seq_event __event; 1001 struct snd_seq_event *ev = &__event.legacy; 1002 1003 if (!(snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT)) 1004 return -ENXIO; 1005 1006 /* check client structures are in place */ 1007 if (snd_BUG_ON(!client)) 1008 return -ENXIO; 1009 1010 if (!client->accept_output || client->pool == NULL) 1011 return -ENXIO; 1012 1013 repeat: 1014 handled = 0; 1015 /* allocate the pool now if the pool is not allocated yet */ 1016 mutex_lock(&client->ioctl_mutex); 1017 if (client->pool->size > 0 && !snd_seq_write_pool_allocated(client)) { 1018 err = snd_seq_pool_init(client->pool); 1019 if (err < 0) 1020 goto out; 1021 } 1022 1023 /* only process whole events */ 1024 err = -EINVAL; 1025 while (count >= sizeof(struct snd_seq_event)) { 1026 /* Read in the event header from the user */ 1027 len = sizeof(struct snd_seq_event); 1028 if (copy_from_user(ev, buf, len)) { 1029 err = -EFAULT; 1030 break; 1031 } 1032 /* read in the rest bytes for UMP events */ 1033 if (snd_seq_ev_is_ump(ev)) { 1034 if (count < sizeof(struct snd_seq_ump_event)) 1035 break; 1036 if (copy_from_user((char *)ev + len, buf + len, 1037 sizeof(struct snd_seq_ump_event) - len)) { 1038 err = -EFAULT; 1039 break; 1040 } 1041 len = sizeof(struct snd_seq_ump_event); 1042 } 1043 1044 ev->source.client = client->number; /* fill in client number */ 1045 /* Check for extension data length */ 1046 if (check_event_type_and_length(ev)) { 1047 err = -EINVAL; 1048 break; 1049 } 1050 1051 if (!event_is_compatible(client, ev)) { 1052 err = -EINVAL; 1053 break; 1054 } 1055 1056 /* check for special events */ 1057 if (!snd_seq_ev_is_ump(ev)) { 1058 if (ev->type == SNDRV_SEQ_EVENT_NONE) 1059 goto __skip_event; 1060 else if (snd_seq_ev_is_reserved(ev)) { 1061 err = -EINVAL; 1062 break; 1063 } 1064 } 1065 1066 if (snd_seq_ev_is_variable(ev)) { 1067 int extlen = ev->data.ext.len & ~SNDRV_SEQ_EXT_MASK; 1068 if ((size_t)(extlen + len) > count) { 1069 /* back out, will get an error this time or next */ 1070 err = -EINVAL; 1071 break; 1072 } 1073 /* set user space pointer */ 1074 ev->data.ext.len = extlen | SNDRV_SEQ_EXT_USRPTR; 1075 ev->data.ext.ptr = (char __force *)buf + len; 1076 len += extlen; /* increment data length */ 1077 } else { 1078 #ifdef CONFIG_COMPAT 1079 if (client->convert32 && snd_seq_ev_is_varusr(ev)) 1080 ev->data.ext.ptr = 1081 (void __force *)compat_ptr(ev->data.raw32.d[1]); 1082 #endif 1083 } 1084 1085 /* ok, enqueue it */ 1086 err = snd_seq_client_enqueue_event(client, ev, file, 1087 !(file->f_flags & O_NONBLOCK), 1088 0, 0, &client->ioctl_mutex); 1089 if (err < 0) 1090 break; 1091 handled++; 1092 1093 __skip_event: 1094 /* Update pointers and counts */ 1095 count -= len; 1096 buf += len; 1097 written += len; 1098 1099 /* let's have a coffee break if too many events are queued */ 1100 if (++handled >= 200) { 1101 mutex_unlock(&client->ioctl_mutex); 1102 goto repeat; 1103 } 1104 } 1105 1106 out: 1107 mutex_unlock(&client->ioctl_mutex); 1108 return written ? written : err; 1109 } 1110 1111 1112 /* 1113 * handle polling 1114 */ 1115 static __poll_t snd_seq_poll(struct file *file, poll_table * wait) 1116 { 1117 struct snd_seq_client *client = file->private_data; 1118 __poll_t mask = 0; 1119 1120 /* check client structures are in place */ 1121 if (snd_BUG_ON(!client)) 1122 return EPOLLERR; 1123 1124 if ((snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_INPUT) && 1125 client->data.user.fifo) { 1126 1127 /* check if data is available in the outqueue */ 1128 if (snd_seq_fifo_poll_wait(client->data.user.fifo, file, wait)) 1129 mask |= EPOLLIN | EPOLLRDNORM; 1130 } 1131 1132 if (snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT) { 1133 1134 /* check if data is available in the pool */ 1135 if (!snd_seq_write_pool_allocated(client) || 1136 snd_seq_pool_poll_wait(client->pool, file, wait)) 1137 mask |= EPOLLOUT | EPOLLWRNORM; 1138 } 1139 1140 return mask; 1141 } 1142 1143 1144 /*-----------------------------------------------------*/ 1145 1146 static int snd_seq_ioctl_pversion(struct snd_seq_client *client, void *arg) 1147 { 1148 int *pversion = arg; 1149 1150 *pversion = SNDRV_SEQ_VERSION; 1151 return 0; 1152 } 1153 1154 static int snd_seq_ioctl_user_pversion(struct snd_seq_client *client, void *arg) 1155 { 1156 client->user_pversion = *(unsigned int *)arg; 1157 return 0; 1158 } 1159 1160 static int snd_seq_ioctl_client_id(struct snd_seq_client *client, void *arg) 1161 { 1162 int *client_id = arg; 1163 1164 *client_id = client->number; 1165 return 0; 1166 } 1167 1168 /* SYSTEM_INFO ioctl() */ 1169 static int snd_seq_ioctl_system_info(struct snd_seq_client *client, void *arg) 1170 { 1171 struct snd_seq_system_info *info = arg; 1172 1173 memset(info, 0, sizeof(*info)); 1174 /* fill the info fields */ 1175 info->queues = SNDRV_SEQ_MAX_QUEUES; 1176 info->clients = SNDRV_SEQ_MAX_CLIENTS; 1177 info->ports = SNDRV_SEQ_MAX_PORTS; 1178 info->channels = 256; /* fixed limit */ 1179 info->cur_clients = client_usage.cur; 1180 info->cur_queues = snd_seq_queue_get_cur_queues(); 1181 1182 return 0; 1183 } 1184 1185 1186 /* RUNNING_MODE ioctl() */ 1187 static int snd_seq_ioctl_running_mode(struct snd_seq_client *client, void *arg) 1188 { 1189 struct snd_seq_running_info *info = arg; 1190 struct snd_seq_client *cptr; 1191 int err = 0; 1192 1193 /* requested client number */ 1194 cptr = snd_seq_client_use_ptr(info->client); 1195 if (cptr == NULL) 1196 return -ENOENT; /* don't change !!! */ 1197 1198 #ifdef SNDRV_BIG_ENDIAN 1199 if (!info->big_endian) { 1200 err = -EINVAL; 1201 goto __err; 1202 } 1203 #else 1204 if (info->big_endian) { 1205 err = -EINVAL; 1206 goto __err; 1207 } 1208 1209 #endif 1210 if (info->cpu_mode > sizeof(long)) { 1211 err = -EINVAL; 1212 goto __err; 1213 } 1214 cptr->convert32 = (info->cpu_mode < sizeof(long)); 1215 __err: 1216 snd_seq_client_unlock(cptr); 1217 return err; 1218 } 1219 1220 /* CLIENT_INFO ioctl() */ 1221 static void get_client_info(struct snd_seq_client *cptr, 1222 struct snd_seq_client_info *info) 1223 { 1224 info->client = cptr->number; 1225 1226 /* fill the info fields */ 1227 info->type = cptr->type; 1228 strcpy(info->name, cptr->name); 1229 info->filter = cptr->filter; 1230 info->event_lost = cptr->event_lost; 1231 memcpy(info->event_filter, cptr->event_filter, 32); 1232 info->group_filter = cptr->group_filter; 1233 info->num_ports = cptr->num_ports; 1234 1235 if (cptr->type == USER_CLIENT) 1236 info->pid = pid_vnr(cptr->data.user.owner); 1237 else 1238 info->pid = -1; 1239 1240 if (cptr->type == KERNEL_CLIENT) 1241 info->card = cptr->data.kernel.card ? cptr->data.kernel.card->number : -1; 1242 else 1243 info->card = -1; 1244 1245 info->midi_version = cptr->midi_version; 1246 memset(info->reserved, 0, sizeof(info->reserved)); 1247 } 1248 1249 static int snd_seq_ioctl_get_client_info(struct snd_seq_client *client, 1250 void *arg) 1251 { 1252 struct snd_seq_client_info *client_info = arg; 1253 struct snd_seq_client *cptr; 1254 1255 /* requested client number */ 1256 cptr = snd_seq_client_use_ptr(client_info->client); 1257 if (cptr == NULL) 1258 return -ENOENT; /* don't change !!! */ 1259 1260 get_client_info(cptr, client_info); 1261 snd_seq_client_unlock(cptr); 1262 1263 return 0; 1264 } 1265 1266 1267 /* CLIENT_INFO ioctl() */ 1268 static int snd_seq_ioctl_set_client_info(struct snd_seq_client *client, 1269 void *arg) 1270 { 1271 struct snd_seq_client_info *client_info = arg; 1272 1273 /* it is not allowed to set the info fields for an another client */ 1274 if (client->number != client_info->client) 1275 return -EPERM; 1276 /* also client type must be set now */ 1277 if (client->type != client_info->type) 1278 return -EINVAL; 1279 1280 /* check validity of midi_version field */ 1281 if (client->user_pversion >= SNDRV_PROTOCOL_VERSION(1, 0, 3) && 1282 client_info->midi_version > SNDRV_SEQ_CLIENT_UMP_MIDI_2_0) 1283 return -EINVAL; 1284 1285 /* fill the info fields */ 1286 if (client_info->name[0]) 1287 strscpy(client->name, client_info->name, sizeof(client->name)); 1288 1289 client->filter = client_info->filter; 1290 client->event_lost = client_info->event_lost; 1291 if (client->user_pversion >= SNDRV_PROTOCOL_VERSION(1, 0, 3)) 1292 client->midi_version = client_info->midi_version; 1293 memcpy(client->event_filter, client_info->event_filter, 32); 1294 client->group_filter = client_info->group_filter; 1295 return 0; 1296 } 1297 1298 1299 /* 1300 * CREATE PORT ioctl() 1301 */ 1302 static int snd_seq_ioctl_create_port(struct snd_seq_client *client, void *arg) 1303 { 1304 struct snd_seq_port_info *info = arg; 1305 struct snd_seq_client_port *port; 1306 struct snd_seq_port_callback *callback; 1307 int port_idx, err; 1308 1309 /* it is not allowed to create the port for an another client */ 1310 if (info->addr.client != client->number) 1311 return -EPERM; 1312 if (client->type == USER_CLIENT && info->kernel) 1313 return -EINVAL; 1314 if ((info->capability & SNDRV_SEQ_PORT_CAP_UMP_ENDPOINT) && 1315 client->ump_endpoint_port >= 0) 1316 return -EBUSY; 1317 1318 if (info->flags & SNDRV_SEQ_PORT_FLG_GIVEN_PORT) 1319 port_idx = info->addr.port; 1320 else 1321 port_idx = -1; 1322 if (port_idx >= SNDRV_SEQ_ADDRESS_UNKNOWN) 1323 return -EINVAL; 1324 err = snd_seq_create_port(client, port_idx, &port); 1325 if (err < 0) 1326 return err; 1327 1328 if (client->type == KERNEL_CLIENT) { 1329 callback = info->kernel; 1330 if (callback) { 1331 if (callback->owner) 1332 port->owner = callback->owner; 1333 port->private_data = callback->private_data; 1334 port->private_free = callback->private_free; 1335 port->event_input = callback->event_input; 1336 port->c_src.open = callback->subscribe; 1337 port->c_src.close = callback->unsubscribe; 1338 port->c_dest.open = callback->use; 1339 port->c_dest.close = callback->unuse; 1340 } 1341 } 1342 1343 info->addr = port->addr; 1344 1345 snd_seq_set_port_info(port, info); 1346 if (info->capability & SNDRV_SEQ_PORT_CAP_UMP_ENDPOINT) 1347 client->ump_endpoint_port = port->addr.port; 1348 snd_seq_system_client_ev_port_start(port->addr.client, port->addr.port); 1349 snd_seq_port_unlock(port); 1350 1351 return 0; 1352 } 1353 1354 /* 1355 * DELETE PORT ioctl() 1356 */ 1357 static int snd_seq_ioctl_delete_port(struct snd_seq_client *client, void *arg) 1358 { 1359 struct snd_seq_port_info *info = arg; 1360 int err; 1361 1362 /* it is not allowed to remove the port for an another client */ 1363 if (info->addr.client != client->number) 1364 return -EPERM; 1365 1366 err = snd_seq_delete_port(client, info->addr.port); 1367 if (err >= 0) { 1368 if (client->ump_endpoint_port == info->addr.port) 1369 client->ump_endpoint_port = -1; 1370 snd_seq_system_client_ev_port_exit(client->number, info->addr.port); 1371 } 1372 return err; 1373 } 1374 1375 1376 /* 1377 * GET_PORT_INFO ioctl() (on any client) 1378 */ 1379 static int snd_seq_ioctl_get_port_info(struct snd_seq_client *client, void *arg) 1380 { 1381 struct snd_seq_port_info *info = arg; 1382 struct snd_seq_client *cptr; 1383 struct snd_seq_client_port *port; 1384 1385 cptr = snd_seq_client_use_ptr(info->addr.client); 1386 if (cptr == NULL) 1387 return -ENXIO; 1388 1389 port = snd_seq_port_use_ptr(cptr, info->addr.port); 1390 if (port == NULL) { 1391 snd_seq_client_unlock(cptr); 1392 return -ENOENT; /* don't change */ 1393 } 1394 1395 /* get port info */ 1396 snd_seq_get_port_info(port, info); 1397 snd_seq_port_unlock(port); 1398 snd_seq_client_unlock(cptr); 1399 1400 return 0; 1401 } 1402 1403 1404 /* 1405 * SET_PORT_INFO ioctl() (only ports on this/own client) 1406 */ 1407 static int snd_seq_ioctl_set_port_info(struct snd_seq_client *client, void *arg) 1408 { 1409 struct snd_seq_port_info *info = arg; 1410 struct snd_seq_client_port *port; 1411 1412 if (info->addr.client != client->number) /* only set our own ports ! */ 1413 return -EPERM; 1414 port = snd_seq_port_use_ptr(client, info->addr.port); 1415 if (port) { 1416 snd_seq_set_port_info(port, info); 1417 snd_seq_port_unlock(port); 1418 } 1419 return 0; 1420 } 1421 1422 1423 /* 1424 * port subscription (connection) 1425 */ 1426 #define PERM_RD (SNDRV_SEQ_PORT_CAP_READ|SNDRV_SEQ_PORT_CAP_SUBS_READ) 1427 #define PERM_WR (SNDRV_SEQ_PORT_CAP_WRITE|SNDRV_SEQ_PORT_CAP_SUBS_WRITE) 1428 1429 static int check_subscription_permission(struct snd_seq_client *client, 1430 struct snd_seq_client_port *sport, 1431 struct snd_seq_client_port *dport, 1432 struct snd_seq_port_subscribe *subs) 1433 { 1434 if (client->number != subs->sender.client && 1435 client->number != subs->dest.client) { 1436 /* connection by third client - check export permission */ 1437 if (check_port_perm(sport, SNDRV_SEQ_PORT_CAP_NO_EXPORT)) 1438 return -EPERM; 1439 if (check_port_perm(dport, SNDRV_SEQ_PORT_CAP_NO_EXPORT)) 1440 return -EPERM; 1441 } 1442 1443 /* check read permission */ 1444 /* if sender or receiver is the subscribing client itself, 1445 * no permission check is necessary 1446 */ 1447 if (client->number != subs->sender.client) { 1448 if (! check_port_perm(sport, PERM_RD)) 1449 return -EPERM; 1450 } 1451 /* check write permission */ 1452 if (client->number != subs->dest.client) { 1453 if (! check_port_perm(dport, PERM_WR)) 1454 return -EPERM; 1455 } 1456 return 0; 1457 } 1458 1459 /* 1460 * send an subscription notify event to user client: 1461 * client must be user client. 1462 */ 1463 int snd_seq_client_notify_subscription(int client, int port, 1464 struct snd_seq_port_subscribe *info, 1465 int evtype) 1466 { 1467 struct snd_seq_event event; 1468 1469 memset(&event, 0, sizeof(event)); 1470 event.type = evtype; 1471 event.data.connect.dest = info->dest; 1472 event.data.connect.sender = info->sender; 1473 1474 return snd_seq_system_notify(client, port, &event); /* non-atomic */ 1475 } 1476 1477 1478 /* 1479 * add to port's subscription list IOCTL interface 1480 */ 1481 static int snd_seq_ioctl_subscribe_port(struct snd_seq_client *client, 1482 void *arg) 1483 { 1484 struct snd_seq_port_subscribe *subs = arg; 1485 int result = -EINVAL; 1486 struct snd_seq_client *receiver = NULL, *sender = NULL; 1487 struct snd_seq_client_port *sport = NULL, *dport = NULL; 1488 1489 receiver = snd_seq_client_use_ptr(subs->dest.client); 1490 if (!receiver) 1491 goto __end; 1492 sender = snd_seq_client_use_ptr(subs->sender.client); 1493 if (!sender) 1494 goto __end; 1495 sport = snd_seq_port_use_ptr(sender, subs->sender.port); 1496 if (!sport) 1497 goto __end; 1498 dport = snd_seq_port_use_ptr(receiver, subs->dest.port); 1499 if (!dport) 1500 goto __end; 1501 1502 result = check_subscription_permission(client, sport, dport, subs); 1503 if (result < 0) 1504 goto __end; 1505 1506 /* connect them */ 1507 result = snd_seq_port_connect(client, sender, sport, receiver, dport, subs); 1508 if (! result) /* broadcast announce */ 1509 snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0, 1510 subs, SNDRV_SEQ_EVENT_PORT_SUBSCRIBED); 1511 __end: 1512 if (sport) 1513 snd_seq_port_unlock(sport); 1514 if (dport) 1515 snd_seq_port_unlock(dport); 1516 if (sender) 1517 snd_seq_client_unlock(sender); 1518 if (receiver) 1519 snd_seq_client_unlock(receiver); 1520 return result; 1521 } 1522 1523 1524 /* 1525 * remove from port's subscription list 1526 */ 1527 static int snd_seq_ioctl_unsubscribe_port(struct snd_seq_client *client, 1528 void *arg) 1529 { 1530 struct snd_seq_port_subscribe *subs = arg; 1531 int result = -ENXIO; 1532 struct snd_seq_client *receiver = NULL, *sender = NULL; 1533 struct snd_seq_client_port *sport = NULL, *dport = NULL; 1534 1535 receiver = snd_seq_client_use_ptr(subs->dest.client); 1536 if (!receiver) 1537 goto __end; 1538 sender = snd_seq_client_use_ptr(subs->sender.client); 1539 if (!sender) 1540 goto __end; 1541 sport = snd_seq_port_use_ptr(sender, subs->sender.port); 1542 if (!sport) 1543 goto __end; 1544 dport = snd_seq_port_use_ptr(receiver, subs->dest.port); 1545 if (!dport) 1546 goto __end; 1547 1548 result = check_subscription_permission(client, sport, dport, subs); 1549 if (result < 0) 1550 goto __end; 1551 1552 result = snd_seq_port_disconnect(client, sender, sport, receiver, dport, subs); 1553 if (! result) /* broadcast announce */ 1554 snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0, 1555 subs, SNDRV_SEQ_EVENT_PORT_UNSUBSCRIBED); 1556 __end: 1557 if (sport) 1558 snd_seq_port_unlock(sport); 1559 if (dport) 1560 snd_seq_port_unlock(dport); 1561 if (sender) 1562 snd_seq_client_unlock(sender); 1563 if (receiver) 1564 snd_seq_client_unlock(receiver); 1565 return result; 1566 } 1567 1568 1569 /* CREATE_QUEUE ioctl() */ 1570 static int snd_seq_ioctl_create_queue(struct snd_seq_client *client, void *arg) 1571 { 1572 struct snd_seq_queue_info *info = arg; 1573 struct snd_seq_queue *q; 1574 1575 q = snd_seq_queue_alloc(client->number, info->locked, info->flags); 1576 if (IS_ERR(q)) 1577 return PTR_ERR(q); 1578 1579 info->queue = q->queue; 1580 info->locked = q->locked; 1581 info->owner = q->owner; 1582 1583 /* set queue name */ 1584 if (!info->name[0]) 1585 snprintf(info->name, sizeof(info->name), "Queue-%d", q->queue); 1586 strscpy(q->name, info->name, sizeof(q->name)); 1587 snd_use_lock_free(&q->use_lock); 1588 1589 return 0; 1590 } 1591 1592 /* DELETE_QUEUE ioctl() */ 1593 static int snd_seq_ioctl_delete_queue(struct snd_seq_client *client, void *arg) 1594 { 1595 struct snd_seq_queue_info *info = arg; 1596 1597 return snd_seq_queue_delete(client->number, info->queue); 1598 } 1599 1600 /* GET_QUEUE_INFO ioctl() */ 1601 static int snd_seq_ioctl_get_queue_info(struct snd_seq_client *client, 1602 void *arg) 1603 { 1604 struct snd_seq_queue_info *info = arg; 1605 struct snd_seq_queue *q; 1606 1607 q = queueptr(info->queue); 1608 if (q == NULL) 1609 return -EINVAL; 1610 1611 memset(info, 0, sizeof(*info)); 1612 info->queue = q->queue; 1613 info->owner = q->owner; 1614 info->locked = q->locked; 1615 strscpy(info->name, q->name, sizeof(info->name)); 1616 queuefree(q); 1617 1618 return 0; 1619 } 1620 1621 /* SET_QUEUE_INFO ioctl() */ 1622 static int snd_seq_ioctl_set_queue_info(struct snd_seq_client *client, 1623 void *arg) 1624 { 1625 struct snd_seq_queue_info *info = arg; 1626 struct snd_seq_queue *q; 1627 1628 if (info->owner != client->number) 1629 return -EINVAL; 1630 1631 /* change owner/locked permission */ 1632 if (snd_seq_queue_check_access(info->queue, client->number)) { 1633 if (snd_seq_queue_set_owner(info->queue, client->number, info->locked) < 0) 1634 return -EPERM; 1635 if (info->locked) 1636 snd_seq_queue_use(info->queue, client->number, 1); 1637 } else { 1638 return -EPERM; 1639 } 1640 1641 q = queueptr(info->queue); 1642 if (! q) 1643 return -EINVAL; 1644 if (q->owner != client->number) { 1645 queuefree(q); 1646 return -EPERM; 1647 } 1648 strscpy(q->name, info->name, sizeof(q->name)); 1649 queuefree(q); 1650 1651 return 0; 1652 } 1653 1654 /* GET_NAMED_QUEUE ioctl() */ 1655 static int snd_seq_ioctl_get_named_queue(struct snd_seq_client *client, 1656 void *arg) 1657 { 1658 struct snd_seq_queue_info *info = arg; 1659 struct snd_seq_queue *q; 1660 1661 q = snd_seq_queue_find_name(info->name); 1662 if (q == NULL) 1663 return -EINVAL; 1664 info->queue = q->queue; 1665 info->owner = q->owner; 1666 info->locked = q->locked; 1667 queuefree(q); 1668 1669 return 0; 1670 } 1671 1672 /* GET_QUEUE_STATUS ioctl() */ 1673 static int snd_seq_ioctl_get_queue_status(struct snd_seq_client *client, 1674 void *arg) 1675 { 1676 struct snd_seq_queue_status *status = arg; 1677 struct snd_seq_queue *queue; 1678 struct snd_seq_timer *tmr; 1679 1680 queue = queueptr(status->queue); 1681 if (queue == NULL) 1682 return -EINVAL; 1683 memset(status, 0, sizeof(*status)); 1684 status->queue = queue->queue; 1685 1686 tmr = queue->timer; 1687 status->events = queue->tickq->cells + queue->timeq->cells; 1688 1689 status->time = snd_seq_timer_get_cur_time(tmr, true); 1690 status->tick = snd_seq_timer_get_cur_tick(tmr); 1691 1692 status->running = tmr->running; 1693 1694 status->flags = queue->flags; 1695 queuefree(queue); 1696 1697 return 0; 1698 } 1699 1700 1701 /* GET_QUEUE_TEMPO ioctl() */ 1702 static int snd_seq_ioctl_get_queue_tempo(struct snd_seq_client *client, 1703 void *arg) 1704 { 1705 struct snd_seq_queue_tempo *tempo = arg; 1706 struct snd_seq_queue *queue; 1707 struct snd_seq_timer *tmr; 1708 1709 queue = queueptr(tempo->queue); 1710 if (queue == NULL) 1711 return -EINVAL; 1712 memset(tempo, 0, sizeof(*tempo)); 1713 tempo->queue = queue->queue; 1714 1715 tmr = queue->timer; 1716 1717 tempo->tempo = tmr->tempo; 1718 tempo->ppq = tmr->ppq; 1719 tempo->skew_value = tmr->skew; 1720 tempo->skew_base = tmr->skew_base; 1721 if (client->user_pversion >= SNDRV_PROTOCOL_VERSION(1, 0, 4)) 1722 tempo->tempo_base = tmr->tempo_base; 1723 queuefree(queue); 1724 1725 return 0; 1726 } 1727 1728 1729 /* SET_QUEUE_TEMPO ioctl() */ 1730 int snd_seq_set_queue_tempo(int client, struct snd_seq_queue_tempo *tempo) 1731 { 1732 if (!snd_seq_queue_check_access(tempo->queue, client)) 1733 return -EPERM; 1734 return snd_seq_queue_timer_set_tempo(tempo->queue, client, tempo); 1735 } 1736 EXPORT_SYMBOL(snd_seq_set_queue_tempo); 1737 1738 static int snd_seq_ioctl_set_queue_tempo(struct snd_seq_client *client, 1739 void *arg) 1740 { 1741 struct snd_seq_queue_tempo *tempo = arg; 1742 int result; 1743 1744 if (client->user_pversion < SNDRV_PROTOCOL_VERSION(1, 0, 4)) 1745 tempo->tempo_base = 0; 1746 result = snd_seq_set_queue_tempo(client->number, tempo); 1747 return result < 0 ? result : 0; 1748 } 1749 1750 1751 /* GET_QUEUE_TIMER ioctl() */ 1752 static int snd_seq_ioctl_get_queue_timer(struct snd_seq_client *client, 1753 void *arg) 1754 { 1755 struct snd_seq_queue_timer *timer = arg; 1756 struct snd_seq_queue *queue; 1757 struct snd_seq_timer *tmr; 1758 1759 queue = queueptr(timer->queue); 1760 if (queue == NULL) 1761 return -EINVAL; 1762 1763 mutex_lock(&queue->timer_mutex); 1764 tmr = queue->timer; 1765 memset(timer, 0, sizeof(*timer)); 1766 timer->queue = queue->queue; 1767 1768 timer->type = tmr->type; 1769 if (tmr->type == SNDRV_SEQ_TIMER_ALSA) { 1770 timer->u.alsa.id = tmr->alsa_id; 1771 timer->u.alsa.resolution = tmr->preferred_resolution; 1772 } 1773 mutex_unlock(&queue->timer_mutex); 1774 queuefree(queue); 1775 1776 return 0; 1777 } 1778 1779 1780 /* SET_QUEUE_TIMER ioctl() */ 1781 static int snd_seq_ioctl_set_queue_timer(struct snd_seq_client *client, 1782 void *arg) 1783 { 1784 struct snd_seq_queue_timer *timer = arg; 1785 int result = 0; 1786 1787 if (timer->type != SNDRV_SEQ_TIMER_ALSA) 1788 return -EINVAL; 1789 1790 if (snd_seq_queue_check_access(timer->queue, client->number)) { 1791 struct snd_seq_queue *q; 1792 struct snd_seq_timer *tmr; 1793 1794 q = queueptr(timer->queue); 1795 if (q == NULL) 1796 return -ENXIO; 1797 mutex_lock(&q->timer_mutex); 1798 tmr = q->timer; 1799 snd_seq_queue_timer_close(timer->queue); 1800 tmr->type = timer->type; 1801 if (tmr->type == SNDRV_SEQ_TIMER_ALSA) { 1802 tmr->alsa_id = timer->u.alsa.id; 1803 tmr->preferred_resolution = timer->u.alsa.resolution; 1804 } 1805 result = snd_seq_queue_timer_open(timer->queue); 1806 mutex_unlock(&q->timer_mutex); 1807 queuefree(q); 1808 } else { 1809 return -EPERM; 1810 } 1811 1812 return result; 1813 } 1814 1815 1816 /* GET_QUEUE_CLIENT ioctl() */ 1817 static int snd_seq_ioctl_get_queue_client(struct snd_seq_client *client, 1818 void *arg) 1819 { 1820 struct snd_seq_queue_client *info = arg; 1821 int used; 1822 1823 used = snd_seq_queue_is_used(info->queue, client->number); 1824 if (used < 0) 1825 return -EINVAL; 1826 info->used = used; 1827 info->client = client->number; 1828 1829 return 0; 1830 } 1831 1832 1833 /* SET_QUEUE_CLIENT ioctl() */ 1834 static int snd_seq_ioctl_set_queue_client(struct snd_seq_client *client, 1835 void *arg) 1836 { 1837 struct snd_seq_queue_client *info = arg; 1838 int err; 1839 1840 if (info->used >= 0) { 1841 err = snd_seq_queue_use(info->queue, client->number, info->used); 1842 if (err < 0) 1843 return err; 1844 } 1845 1846 return snd_seq_ioctl_get_queue_client(client, arg); 1847 } 1848 1849 1850 /* GET_CLIENT_POOL ioctl() */ 1851 static int snd_seq_ioctl_get_client_pool(struct snd_seq_client *client, 1852 void *arg) 1853 { 1854 struct snd_seq_client_pool *info = arg; 1855 struct snd_seq_client *cptr; 1856 1857 cptr = snd_seq_client_use_ptr(info->client); 1858 if (cptr == NULL) 1859 return -ENOENT; 1860 memset(info, 0, sizeof(*info)); 1861 info->client = cptr->number; 1862 info->output_pool = cptr->pool->size; 1863 info->output_room = cptr->pool->room; 1864 info->output_free = info->output_pool; 1865 info->output_free = snd_seq_unused_cells(cptr->pool); 1866 if (cptr->type == USER_CLIENT) { 1867 info->input_pool = cptr->data.user.fifo_pool_size; 1868 info->input_free = info->input_pool; 1869 info->input_free = snd_seq_fifo_unused_cells(cptr->data.user.fifo); 1870 } else { 1871 info->input_pool = 0; 1872 info->input_free = 0; 1873 } 1874 snd_seq_client_unlock(cptr); 1875 1876 return 0; 1877 } 1878 1879 /* SET_CLIENT_POOL ioctl() */ 1880 static int snd_seq_ioctl_set_client_pool(struct snd_seq_client *client, 1881 void *arg) 1882 { 1883 struct snd_seq_client_pool *info = arg; 1884 int rc; 1885 1886 if (client->number != info->client) 1887 return -EINVAL; /* can't change other clients */ 1888 1889 if (info->output_pool >= 1 && info->output_pool <= SNDRV_SEQ_MAX_EVENTS && 1890 (! snd_seq_write_pool_allocated(client) || 1891 info->output_pool != client->pool->size)) { 1892 if (snd_seq_write_pool_allocated(client)) { 1893 /* is the pool in use? */ 1894 if (atomic_read(&client->pool->counter)) 1895 return -EBUSY; 1896 /* remove all existing cells */ 1897 snd_seq_pool_mark_closing(client->pool); 1898 snd_seq_pool_done(client->pool); 1899 } 1900 client->pool->size = info->output_pool; 1901 rc = snd_seq_pool_init(client->pool); 1902 if (rc < 0) 1903 return rc; 1904 } 1905 if (client->type == USER_CLIENT && client->data.user.fifo != NULL && 1906 info->input_pool >= 1 && 1907 info->input_pool <= SNDRV_SEQ_MAX_CLIENT_EVENTS && 1908 info->input_pool != client->data.user.fifo_pool_size) { 1909 /* change pool size */ 1910 rc = snd_seq_fifo_resize(client->data.user.fifo, info->input_pool); 1911 if (rc < 0) 1912 return rc; 1913 client->data.user.fifo_pool_size = info->input_pool; 1914 } 1915 if (info->output_room >= 1 && 1916 info->output_room <= client->pool->size) { 1917 client->pool->room = info->output_room; 1918 } 1919 1920 return snd_seq_ioctl_get_client_pool(client, arg); 1921 } 1922 1923 1924 /* REMOVE_EVENTS ioctl() */ 1925 static int snd_seq_ioctl_remove_events(struct snd_seq_client *client, 1926 void *arg) 1927 { 1928 struct snd_seq_remove_events *info = arg; 1929 1930 /* 1931 * Input mostly not implemented XXX. 1932 */ 1933 if (info->remove_mode & SNDRV_SEQ_REMOVE_INPUT) { 1934 /* 1935 * No restrictions so for a user client we can clear 1936 * the whole fifo 1937 */ 1938 if (client->type == USER_CLIENT && client->data.user.fifo) 1939 snd_seq_fifo_clear(client->data.user.fifo); 1940 } 1941 1942 if (info->remove_mode & SNDRV_SEQ_REMOVE_OUTPUT) 1943 snd_seq_queue_remove_cells(client->number, info); 1944 1945 return 0; 1946 } 1947 1948 1949 /* 1950 * get subscription info 1951 */ 1952 static int snd_seq_ioctl_get_subscription(struct snd_seq_client *client, 1953 void *arg) 1954 { 1955 struct snd_seq_port_subscribe *subs = arg; 1956 int result; 1957 struct snd_seq_client *sender = NULL; 1958 struct snd_seq_client_port *sport = NULL; 1959 1960 result = -EINVAL; 1961 sender = snd_seq_client_use_ptr(subs->sender.client); 1962 if (!sender) 1963 goto __end; 1964 sport = snd_seq_port_use_ptr(sender, subs->sender.port); 1965 if (!sport) 1966 goto __end; 1967 result = snd_seq_port_get_subscription(&sport->c_src, &subs->dest, 1968 subs); 1969 __end: 1970 if (sport) 1971 snd_seq_port_unlock(sport); 1972 if (sender) 1973 snd_seq_client_unlock(sender); 1974 1975 return result; 1976 } 1977 1978 1979 /* 1980 * get subscription info - check only its presence 1981 */ 1982 static int snd_seq_ioctl_query_subs(struct snd_seq_client *client, void *arg) 1983 { 1984 struct snd_seq_query_subs *subs = arg; 1985 int result = -ENXIO; 1986 struct snd_seq_client *cptr = NULL; 1987 struct snd_seq_client_port *port = NULL; 1988 struct snd_seq_port_subs_info *group; 1989 struct list_head *p; 1990 int i; 1991 1992 cptr = snd_seq_client_use_ptr(subs->root.client); 1993 if (!cptr) 1994 goto __end; 1995 port = snd_seq_port_use_ptr(cptr, subs->root.port); 1996 if (!port) 1997 goto __end; 1998 1999 switch (subs->type) { 2000 case SNDRV_SEQ_QUERY_SUBS_READ: 2001 group = &port->c_src; 2002 break; 2003 case SNDRV_SEQ_QUERY_SUBS_WRITE: 2004 group = &port->c_dest; 2005 break; 2006 default: 2007 goto __end; 2008 } 2009 2010 down_read(&group->list_mutex); 2011 /* search for the subscriber */ 2012 subs->num_subs = group->count; 2013 i = 0; 2014 result = -ENOENT; 2015 list_for_each(p, &group->list_head) { 2016 if (i++ == subs->index) { 2017 /* found! */ 2018 struct snd_seq_subscribers *s; 2019 if (subs->type == SNDRV_SEQ_QUERY_SUBS_READ) { 2020 s = list_entry(p, struct snd_seq_subscribers, src_list); 2021 subs->addr = s->info.dest; 2022 } else { 2023 s = list_entry(p, struct snd_seq_subscribers, dest_list); 2024 subs->addr = s->info.sender; 2025 } 2026 subs->flags = s->info.flags; 2027 subs->queue = s->info.queue; 2028 result = 0; 2029 break; 2030 } 2031 } 2032 up_read(&group->list_mutex); 2033 2034 __end: 2035 if (port) 2036 snd_seq_port_unlock(port); 2037 if (cptr) 2038 snd_seq_client_unlock(cptr); 2039 2040 return result; 2041 } 2042 2043 2044 /* 2045 * query next client 2046 */ 2047 static int snd_seq_ioctl_query_next_client(struct snd_seq_client *client, 2048 void *arg) 2049 { 2050 struct snd_seq_client_info *info = arg; 2051 struct snd_seq_client *cptr = NULL; 2052 2053 /* search for next client */ 2054 if (info->client < INT_MAX) 2055 info->client++; 2056 if (info->client < 0) 2057 info->client = 0; 2058 for (; info->client < SNDRV_SEQ_MAX_CLIENTS; info->client++) { 2059 cptr = snd_seq_client_use_ptr(info->client); 2060 if (cptr) 2061 break; /* found */ 2062 } 2063 if (cptr == NULL) 2064 return -ENOENT; 2065 2066 get_client_info(cptr, info); 2067 snd_seq_client_unlock(cptr); 2068 2069 return 0; 2070 } 2071 2072 /* 2073 * query next port 2074 */ 2075 static int snd_seq_ioctl_query_next_port(struct snd_seq_client *client, 2076 void *arg) 2077 { 2078 struct snd_seq_port_info *info = arg; 2079 struct snd_seq_client *cptr; 2080 struct snd_seq_client_port *port = NULL; 2081 2082 cptr = snd_seq_client_use_ptr(info->addr.client); 2083 if (cptr == NULL) 2084 return -ENXIO; 2085 2086 /* search for next port */ 2087 info->addr.port++; 2088 port = snd_seq_port_query_nearest(cptr, info); 2089 if (port == NULL) { 2090 snd_seq_client_unlock(cptr); 2091 return -ENOENT; 2092 } 2093 2094 /* get port info */ 2095 info->addr = port->addr; 2096 snd_seq_get_port_info(port, info); 2097 snd_seq_port_unlock(port); 2098 snd_seq_client_unlock(cptr); 2099 2100 return 0; 2101 } 2102 2103 #if IS_ENABLED(CONFIG_SND_SEQ_UMP) 2104 #define NUM_UMP_INFOS (SNDRV_UMP_MAX_BLOCKS + 1) 2105 2106 static void free_ump_info(struct snd_seq_client *client) 2107 { 2108 int i; 2109 2110 if (!client->ump_info) 2111 return; 2112 for (i = 0; i < NUM_UMP_INFOS; i++) 2113 kfree(client->ump_info[i]); 2114 kfree(client->ump_info); 2115 client->ump_info = NULL; 2116 } 2117 2118 static void terminate_ump_info_strings(void *p, int type) 2119 { 2120 if (type == SNDRV_SEQ_CLIENT_UMP_INFO_ENDPOINT) { 2121 struct snd_ump_endpoint_info *ep = p; 2122 ep->name[sizeof(ep->name) - 1] = 0; 2123 } else { 2124 struct snd_ump_block_info *bp = p; 2125 bp->name[sizeof(bp->name) - 1] = 0; 2126 } 2127 } 2128 2129 #ifdef CONFIG_SND_PROC_FS 2130 static void dump_ump_info(struct snd_info_buffer *buffer, 2131 struct snd_seq_client *client) 2132 { 2133 struct snd_ump_endpoint_info *ep; 2134 struct snd_ump_block_info *bp; 2135 int i; 2136 2137 if (!client->ump_info) 2138 return; 2139 ep = client->ump_info[SNDRV_SEQ_CLIENT_UMP_INFO_ENDPOINT]; 2140 if (ep && *ep->name) 2141 snd_iprintf(buffer, " UMP Endpoint: \"%s\"\n", ep->name); 2142 for (i = 0; i < SNDRV_UMP_MAX_BLOCKS; i++) { 2143 bp = client->ump_info[i + 1]; 2144 if (bp && *bp->name) { 2145 snd_iprintf(buffer, " UMP Block %d: \"%s\" [%s]\n", 2146 i, bp->name, 2147 bp->active ? "Active" : "Inactive"); 2148 snd_iprintf(buffer, " Groups: %d-%d\n", 2149 bp->first_group + 1, 2150 bp->first_group + bp->num_groups); 2151 } 2152 } 2153 } 2154 #endif 2155 2156 /* UMP-specific ioctls -- called directly without data copy */ 2157 static int snd_seq_ioctl_client_ump_info(struct snd_seq_client *caller, 2158 unsigned int cmd, 2159 unsigned long arg) 2160 { 2161 struct snd_seq_client_ump_info __user *argp = 2162 (struct snd_seq_client_ump_info __user *)arg; 2163 struct snd_seq_client *cptr; 2164 int client, type, err = 0; 2165 size_t size; 2166 void *p; 2167 2168 if (get_user(client, &argp->client) || get_user(type, &argp->type)) 2169 return -EFAULT; 2170 if (cmd == SNDRV_SEQ_IOCTL_SET_CLIENT_UMP_INFO && 2171 caller->number != client) 2172 return -EPERM; 2173 if (type < 0 || type >= NUM_UMP_INFOS) 2174 return -EINVAL; 2175 if (type == SNDRV_SEQ_CLIENT_UMP_INFO_ENDPOINT) 2176 size = sizeof(struct snd_ump_endpoint_info); 2177 else 2178 size = sizeof(struct snd_ump_block_info); 2179 cptr = snd_seq_client_use_ptr(client); 2180 if (!cptr) 2181 return -ENOENT; 2182 2183 mutex_lock(&cptr->ioctl_mutex); 2184 if (!cptr->midi_version) { 2185 err = -EBADFD; 2186 goto error; 2187 } 2188 2189 if (cmd == SNDRV_SEQ_IOCTL_GET_CLIENT_UMP_INFO) { 2190 if (!cptr->ump_info) 2191 p = NULL; 2192 else 2193 p = cptr->ump_info[type]; 2194 if (!p) { 2195 err = -ENODEV; 2196 goto error; 2197 } 2198 if (copy_to_user(argp->info, p, size)) { 2199 err = -EFAULT; 2200 goto error; 2201 } 2202 } else { 2203 if (cptr->type != USER_CLIENT) { 2204 err = -EBADFD; 2205 goto error; 2206 } 2207 if (!cptr->ump_info) { 2208 cptr->ump_info = kcalloc(NUM_UMP_INFOS, 2209 sizeof(void *), GFP_KERNEL); 2210 if (!cptr->ump_info) { 2211 err = -ENOMEM; 2212 goto error; 2213 } 2214 } 2215 p = memdup_user(argp->info, size); 2216 if (IS_ERR(p)) { 2217 err = PTR_ERR(p); 2218 goto error; 2219 } 2220 kfree(cptr->ump_info[type]); 2221 terminate_ump_info_strings(p, type); 2222 cptr->ump_info[type] = p; 2223 } 2224 2225 error: 2226 mutex_unlock(&cptr->ioctl_mutex); 2227 snd_seq_client_unlock(cptr); 2228 return err; 2229 } 2230 #endif 2231 2232 /* -------------------------------------------------------- */ 2233 2234 static const struct ioctl_handler { 2235 unsigned int cmd; 2236 int (*func)(struct snd_seq_client *client, void *arg); 2237 } ioctl_handlers[] = { 2238 { SNDRV_SEQ_IOCTL_PVERSION, snd_seq_ioctl_pversion }, 2239 { SNDRV_SEQ_IOCTL_USER_PVERSION, snd_seq_ioctl_user_pversion }, 2240 { SNDRV_SEQ_IOCTL_CLIENT_ID, snd_seq_ioctl_client_id }, 2241 { SNDRV_SEQ_IOCTL_SYSTEM_INFO, snd_seq_ioctl_system_info }, 2242 { SNDRV_SEQ_IOCTL_RUNNING_MODE, snd_seq_ioctl_running_mode }, 2243 { SNDRV_SEQ_IOCTL_GET_CLIENT_INFO, snd_seq_ioctl_get_client_info }, 2244 { SNDRV_SEQ_IOCTL_SET_CLIENT_INFO, snd_seq_ioctl_set_client_info }, 2245 { SNDRV_SEQ_IOCTL_CREATE_PORT, snd_seq_ioctl_create_port }, 2246 { SNDRV_SEQ_IOCTL_DELETE_PORT, snd_seq_ioctl_delete_port }, 2247 { SNDRV_SEQ_IOCTL_GET_PORT_INFO, snd_seq_ioctl_get_port_info }, 2248 { SNDRV_SEQ_IOCTL_SET_PORT_INFO, snd_seq_ioctl_set_port_info }, 2249 { SNDRV_SEQ_IOCTL_SUBSCRIBE_PORT, snd_seq_ioctl_subscribe_port }, 2250 { SNDRV_SEQ_IOCTL_UNSUBSCRIBE_PORT, snd_seq_ioctl_unsubscribe_port }, 2251 { SNDRV_SEQ_IOCTL_CREATE_QUEUE, snd_seq_ioctl_create_queue }, 2252 { SNDRV_SEQ_IOCTL_DELETE_QUEUE, snd_seq_ioctl_delete_queue }, 2253 { SNDRV_SEQ_IOCTL_GET_QUEUE_INFO, snd_seq_ioctl_get_queue_info }, 2254 { SNDRV_SEQ_IOCTL_SET_QUEUE_INFO, snd_seq_ioctl_set_queue_info }, 2255 { SNDRV_SEQ_IOCTL_GET_NAMED_QUEUE, snd_seq_ioctl_get_named_queue }, 2256 { SNDRV_SEQ_IOCTL_GET_QUEUE_STATUS, snd_seq_ioctl_get_queue_status }, 2257 { SNDRV_SEQ_IOCTL_GET_QUEUE_TEMPO, snd_seq_ioctl_get_queue_tempo }, 2258 { SNDRV_SEQ_IOCTL_SET_QUEUE_TEMPO, snd_seq_ioctl_set_queue_tempo }, 2259 { SNDRV_SEQ_IOCTL_GET_QUEUE_TIMER, snd_seq_ioctl_get_queue_timer }, 2260 { SNDRV_SEQ_IOCTL_SET_QUEUE_TIMER, snd_seq_ioctl_set_queue_timer }, 2261 { SNDRV_SEQ_IOCTL_GET_QUEUE_CLIENT, snd_seq_ioctl_get_queue_client }, 2262 { SNDRV_SEQ_IOCTL_SET_QUEUE_CLIENT, snd_seq_ioctl_set_queue_client }, 2263 { SNDRV_SEQ_IOCTL_GET_CLIENT_POOL, snd_seq_ioctl_get_client_pool }, 2264 { SNDRV_SEQ_IOCTL_SET_CLIENT_POOL, snd_seq_ioctl_set_client_pool }, 2265 { SNDRV_SEQ_IOCTL_GET_SUBSCRIPTION, snd_seq_ioctl_get_subscription }, 2266 { SNDRV_SEQ_IOCTL_QUERY_NEXT_CLIENT, snd_seq_ioctl_query_next_client }, 2267 { SNDRV_SEQ_IOCTL_QUERY_NEXT_PORT, snd_seq_ioctl_query_next_port }, 2268 { SNDRV_SEQ_IOCTL_REMOVE_EVENTS, snd_seq_ioctl_remove_events }, 2269 { SNDRV_SEQ_IOCTL_QUERY_SUBS, snd_seq_ioctl_query_subs }, 2270 { 0, NULL }, 2271 }; 2272 2273 static long snd_seq_ioctl(struct file *file, unsigned int cmd, 2274 unsigned long arg) 2275 { 2276 struct snd_seq_client *client = file->private_data; 2277 /* To use kernel stack for ioctl data. */ 2278 union { 2279 int pversion; 2280 int client_id; 2281 struct snd_seq_system_info system_info; 2282 struct snd_seq_running_info running_info; 2283 struct snd_seq_client_info client_info; 2284 struct snd_seq_port_info port_info; 2285 struct snd_seq_port_subscribe port_subscribe; 2286 struct snd_seq_queue_info queue_info; 2287 struct snd_seq_queue_status queue_status; 2288 struct snd_seq_queue_tempo tempo; 2289 struct snd_seq_queue_timer queue_timer; 2290 struct snd_seq_queue_client queue_client; 2291 struct snd_seq_client_pool client_pool; 2292 struct snd_seq_remove_events remove_events; 2293 struct snd_seq_query_subs query_subs; 2294 } buf; 2295 const struct ioctl_handler *handler; 2296 unsigned long size; 2297 int err; 2298 2299 if (snd_BUG_ON(!client)) 2300 return -ENXIO; 2301 2302 #if IS_ENABLED(CONFIG_SND_SEQ_UMP) 2303 /* exception - handling large data */ 2304 switch (cmd) { 2305 case SNDRV_SEQ_IOCTL_GET_CLIENT_UMP_INFO: 2306 case SNDRV_SEQ_IOCTL_SET_CLIENT_UMP_INFO: 2307 return snd_seq_ioctl_client_ump_info(client, cmd, arg); 2308 } 2309 #endif 2310 2311 for (handler = ioctl_handlers; handler->cmd > 0; ++handler) { 2312 if (handler->cmd == cmd) 2313 break; 2314 } 2315 if (handler->cmd == 0) 2316 return -ENOTTY; 2317 2318 memset(&buf, 0, sizeof(buf)); 2319 2320 /* 2321 * All of ioctl commands for ALSA sequencer get an argument of size 2322 * within 13 bits. We can safely pick up the size from the command. 2323 */ 2324 size = _IOC_SIZE(handler->cmd); 2325 if (handler->cmd & IOC_IN) { 2326 if (copy_from_user(&buf, (const void __user *)arg, size)) 2327 return -EFAULT; 2328 } 2329 2330 mutex_lock(&client->ioctl_mutex); 2331 err = handler->func(client, &buf); 2332 mutex_unlock(&client->ioctl_mutex); 2333 if (err >= 0) { 2334 /* Some commands includes a bug in 'dir' field. */ 2335 if (handler->cmd == SNDRV_SEQ_IOCTL_SET_QUEUE_CLIENT || 2336 handler->cmd == SNDRV_SEQ_IOCTL_SET_CLIENT_POOL || 2337 (handler->cmd & IOC_OUT)) 2338 if (copy_to_user((void __user *)arg, &buf, size)) 2339 return -EFAULT; 2340 } 2341 2342 return err; 2343 } 2344 2345 #ifdef CONFIG_COMPAT 2346 #include "seq_compat.c" 2347 #else 2348 #define snd_seq_ioctl_compat NULL 2349 #endif 2350 2351 /* -------------------------------------------------------- */ 2352 2353 2354 /* exported to kernel modules */ 2355 int snd_seq_create_kernel_client(struct snd_card *card, int client_index, 2356 const char *name_fmt, ...) 2357 { 2358 struct snd_seq_client *client; 2359 va_list args; 2360 2361 if (snd_BUG_ON(in_interrupt())) 2362 return -EBUSY; 2363 2364 if (card && client_index >= SNDRV_SEQ_CLIENTS_PER_CARD) 2365 return -EINVAL; 2366 if (card == NULL && client_index >= SNDRV_SEQ_GLOBAL_CLIENTS) 2367 return -EINVAL; 2368 2369 mutex_lock(®ister_mutex); 2370 2371 if (card) { 2372 client_index += SNDRV_SEQ_GLOBAL_CLIENTS 2373 + card->number * SNDRV_SEQ_CLIENTS_PER_CARD; 2374 if (client_index >= SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN) 2375 client_index = -1; 2376 } 2377 2378 /* empty write queue as default */ 2379 client = seq_create_client1(client_index, 0); 2380 if (client == NULL) { 2381 mutex_unlock(®ister_mutex); 2382 return -EBUSY; /* failure code */ 2383 } 2384 usage_alloc(&client_usage, 1); 2385 2386 client->accept_input = 1; 2387 client->accept_output = 1; 2388 client->data.kernel.card = card; 2389 client->user_pversion = SNDRV_SEQ_VERSION; 2390 2391 va_start(args, name_fmt); 2392 vsnprintf(client->name, sizeof(client->name), name_fmt, args); 2393 va_end(args); 2394 2395 client->type = KERNEL_CLIENT; 2396 mutex_unlock(®ister_mutex); 2397 2398 /* make others aware this new client */ 2399 snd_seq_system_client_ev_client_start(client->number); 2400 2401 /* return client number to caller */ 2402 return client->number; 2403 } 2404 EXPORT_SYMBOL(snd_seq_create_kernel_client); 2405 2406 /* exported to kernel modules */ 2407 int snd_seq_delete_kernel_client(int client) 2408 { 2409 struct snd_seq_client *ptr; 2410 2411 if (snd_BUG_ON(in_interrupt())) 2412 return -EBUSY; 2413 2414 ptr = clientptr(client); 2415 if (ptr == NULL) 2416 return -EINVAL; 2417 2418 seq_free_client(ptr); 2419 kfree(ptr); 2420 return 0; 2421 } 2422 EXPORT_SYMBOL(snd_seq_delete_kernel_client); 2423 2424 /* 2425 * exported, called by kernel clients to enqueue events (w/o blocking) 2426 * 2427 * RETURN VALUE: zero if succeed, negative if error 2428 */ 2429 int snd_seq_kernel_client_enqueue(int client, struct snd_seq_event *ev, 2430 struct file *file, bool blocking) 2431 { 2432 struct snd_seq_client *cptr; 2433 int result; 2434 2435 if (snd_BUG_ON(!ev)) 2436 return -EINVAL; 2437 2438 if (!snd_seq_ev_is_ump(ev)) { 2439 if (ev->type == SNDRV_SEQ_EVENT_NONE) 2440 return 0; /* ignore this */ 2441 if (ev->type == SNDRV_SEQ_EVENT_KERNEL_ERROR) 2442 return -EINVAL; /* quoted events can't be enqueued */ 2443 } 2444 2445 /* fill in client number */ 2446 ev->source.client = client; 2447 2448 if (check_event_type_and_length(ev)) 2449 return -EINVAL; 2450 2451 cptr = snd_seq_client_use_ptr(client); 2452 if (cptr == NULL) 2453 return -EINVAL; 2454 2455 if (!cptr->accept_output) { 2456 result = -EPERM; 2457 } else { /* send it */ 2458 mutex_lock(&cptr->ioctl_mutex); 2459 result = snd_seq_client_enqueue_event(cptr, ev, file, blocking, 2460 false, 0, 2461 &cptr->ioctl_mutex); 2462 mutex_unlock(&cptr->ioctl_mutex); 2463 } 2464 2465 snd_seq_client_unlock(cptr); 2466 return result; 2467 } 2468 EXPORT_SYMBOL(snd_seq_kernel_client_enqueue); 2469 2470 /* 2471 * exported, called by kernel clients to dispatch events directly to other 2472 * clients, bypassing the queues. Event time-stamp will be updated. 2473 * 2474 * RETURN VALUE: negative = delivery failed, 2475 * zero, or positive: the number of delivered events 2476 */ 2477 int snd_seq_kernel_client_dispatch(int client, struct snd_seq_event * ev, 2478 int atomic, int hop) 2479 { 2480 struct snd_seq_client *cptr; 2481 int result; 2482 2483 if (snd_BUG_ON(!ev)) 2484 return -EINVAL; 2485 2486 /* fill in client number */ 2487 ev->queue = SNDRV_SEQ_QUEUE_DIRECT; 2488 ev->source.client = client; 2489 2490 if (check_event_type_and_length(ev)) 2491 return -EINVAL; 2492 2493 cptr = snd_seq_client_use_ptr(client); 2494 if (cptr == NULL) 2495 return -EINVAL; 2496 2497 if (!cptr->accept_output) 2498 result = -EPERM; 2499 else 2500 result = snd_seq_deliver_event(cptr, ev, atomic, hop); 2501 2502 snd_seq_client_unlock(cptr); 2503 return result; 2504 } 2505 EXPORT_SYMBOL(snd_seq_kernel_client_dispatch); 2506 2507 /** 2508 * snd_seq_kernel_client_ctl - operate a command for a client with data in 2509 * kernel space. 2510 * @clientid: A numerical ID for a client. 2511 * @cmd: An ioctl(2) command for ALSA sequencer operation. 2512 * @arg: A pointer to data in kernel space. 2513 * 2514 * Against its name, both kernel/application client can be handled by this 2515 * kernel API. A pointer of 'arg' argument should be in kernel space. 2516 * 2517 * Return: 0 at success. Negative error code at failure. 2518 */ 2519 int snd_seq_kernel_client_ctl(int clientid, unsigned int cmd, void *arg) 2520 { 2521 const struct ioctl_handler *handler; 2522 struct snd_seq_client *client; 2523 2524 client = clientptr(clientid); 2525 if (client == NULL) 2526 return -ENXIO; 2527 2528 for (handler = ioctl_handlers; handler->cmd > 0; ++handler) { 2529 if (handler->cmd == cmd) 2530 return handler->func(client, arg); 2531 } 2532 2533 pr_debug("ALSA: seq unknown ioctl() 0x%x (type='%c', number=0x%02x)\n", 2534 cmd, _IOC_TYPE(cmd), _IOC_NR(cmd)); 2535 return -ENOTTY; 2536 } 2537 EXPORT_SYMBOL(snd_seq_kernel_client_ctl); 2538 2539 /* exported (for OSS emulator) */ 2540 int snd_seq_kernel_client_write_poll(int clientid, struct file *file, poll_table *wait) 2541 { 2542 struct snd_seq_client *client; 2543 2544 client = clientptr(clientid); 2545 if (client == NULL) 2546 return -ENXIO; 2547 2548 if (! snd_seq_write_pool_allocated(client)) 2549 return 1; 2550 if (snd_seq_pool_poll_wait(client->pool, file, wait)) 2551 return 1; 2552 return 0; 2553 } 2554 EXPORT_SYMBOL(snd_seq_kernel_client_write_poll); 2555 2556 /* get a sequencer client object; for internal use from a kernel client */ 2557 struct snd_seq_client *snd_seq_kernel_client_get(int id) 2558 { 2559 return snd_seq_client_use_ptr(id); 2560 } 2561 EXPORT_SYMBOL_GPL(snd_seq_kernel_client_get); 2562 2563 /* put a sequencer client object; for internal use from a kernel client */ 2564 void snd_seq_kernel_client_put(struct snd_seq_client *cptr) 2565 { 2566 if (cptr) 2567 snd_seq_client_unlock(cptr); 2568 } 2569 EXPORT_SYMBOL_GPL(snd_seq_kernel_client_put); 2570 2571 /*---------------------------------------------------------------------------*/ 2572 2573 #ifdef CONFIG_SND_PROC_FS 2574 /* 2575 * /proc interface 2576 */ 2577 static void snd_seq_info_dump_subscribers(struct snd_info_buffer *buffer, 2578 struct snd_seq_port_subs_info *group, 2579 int is_src, char *msg) 2580 { 2581 struct list_head *p; 2582 struct snd_seq_subscribers *s; 2583 int count = 0; 2584 2585 down_read(&group->list_mutex); 2586 if (list_empty(&group->list_head)) { 2587 up_read(&group->list_mutex); 2588 return; 2589 } 2590 snd_iprintf(buffer, msg); 2591 list_for_each(p, &group->list_head) { 2592 if (is_src) 2593 s = list_entry(p, struct snd_seq_subscribers, src_list); 2594 else 2595 s = list_entry(p, struct snd_seq_subscribers, dest_list); 2596 if (count++) 2597 snd_iprintf(buffer, ", "); 2598 snd_iprintf(buffer, "%d:%d", 2599 is_src ? s->info.dest.client : s->info.sender.client, 2600 is_src ? s->info.dest.port : s->info.sender.port); 2601 if (s->info.flags & SNDRV_SEQ_PORT_SUBS_TIMESTAMP) 2602 snd_iprintf(buffer, "[%c:%d]", ((s->info.flags & SNDRV_SEQ_PORT_SUBS_TIME_REAL) ? 'r' : 't'), s->info.queue); 2603 if (group->exclusive) 2604 snd_iprintf(buffer, "[ex]"); 2605 } 2606 up_read(&group->list_mutex); 2607 snd_iprintf(buffer, "\n"); 2608 } 2609 2610 #define FLAG_PERM_RD(perm) ((perm) & SNDRV_SEQ_PORT_CAP_READ ? ((perm) & SNDRV_SEQ_PORT_CAP_SUBS_READ ? 'R' : 'r') : '-') 2611 #define FLAG_PERM_WR(perm) ((perm) & SNDRV_SEQ_PORT_CAP_WRITE ? ((perm) & SNDRV_SEQ_PORT_CAP_SUBS_WRITE ? 'W' : 'w') : '-') 2612 #define FLAG_PERM_EX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_NO_EXPORT ? '-' : 'e') 2613 2614 #define FLAG_PERM_DUPLEX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_DUPLEX ? 'X' : '-') 2615 2616 static const char *port_direction_name(unsigned char dir) 2617 { 2618 static const char *names[4] = { 2619 "-", "In", "Out", "In/Out" 2620 }; 2621 2622 if (dir > SNDRV_SEQ_PORT_DIR_BIDIRECTION) 2623 return "Invalid"; 2624 return names[dir]; 2625 } 2626 2627 static void snd_seq_info_dump_ports(struct snd_info_buffer *buffer, 2628 struct snd_seq_client *client) 2629 { 2630 struct snd_seq_client_port *p; 2631 2632 mutex_lock(&client->ports_mutex); 2633 list_for_each_entry(p, &client->ports_list_head, list) { 2634 if (p->capability & SNDRV_SEQ_PORT_CAP_INACTIVE) 2635 continue; 2636 snd_iprintf(buffer, " Port %3d : \"%s\" (%c%c%c%c) [%s]\n", 2637 p->addr.port, p->name, 2638 FLAG_PERM_RD(p->capability), 2639 FLAG_PERM_WR(p->capability), 2640 FLAG_PERM_EX(p->capability), 2641 FLAG_PERM_DUPLEX(p->capability), 2642 port_direction_name(p->direction)); 2643 snd_seq_info_dump_subscribers(buffer, &p->c_src, 1, " Connecting To: "); 2644 snd_seq_info_dump_subscribers(buffer, &p->c_dest, 0, " Connected From: "); 2645 } 2646 mutex_unlock(&client->ports_mutex); 2647 } 2648 2649 static const char *midi_version_string(unsigned int version) 2650 { 2651 switch (version) { 2652 case SNDRV_SEQ_CLIENT_LEGACY_MIDI: 2653 return "Legacy"; 2654 case SNDRV_SEQ_CLIENT_UMP_MIDI_1_0: 2655 return "UMP MIDI1"; 2656 case SNDRV_SEQ_CLIENT_UMP_MIDI_2_0: 2657 return "UMP MIDI2"; 2658 default: 2659 return "Unknown"; 2660 } 2661 } 2662 2663 /* exported to seq_info.c */ 2664 void snd_seq_info_clients_read(struct snd_info_entry *entry, 2665 struct snd_info_buffer *buffer) 2666 { 2667 int c; 2668 struct snd_seq_client *client; 2669 2670 snd_iprintf(buffer, "Client info\n"); 2671 snd_iprintf(buffer, " cur clients : %d\n", client_usage.cur); 2672 snd_iprintf(buffer, " peak clients : %d\n", client_usage.peak); 2673 snd_iprintf(buffer, " max clients : %d\n", SNDRV_SEQ_MAX_CLIENTS); 2674 snd_iprintf(buffer, "\n"); 2675 2676 /* list the client table */ 2677 for (c = 0; c < SNDRV_SEQ_MAX_CLIENTS; c++) { 2678 client = snd_seq_client_use_ptr(c); 2679 if (client == NULL) 2680 continue; 2681 if (client->type == NO_CLIENT) { 2682 snd_seq_client_unlock(client); 2683 continue; 2684 } 2685 2686 snd_iprintf(buffer, "Client %3d : \"%s\" [%s %s]\n", 2687 c, client->name, 2688 client->type == USER_CLIENT ? "User" : "Kernel", 2689 midi_version_string(client->midi_version)); 2690 #if IS_ENABLED(CONFIG_SND_SEQ_UMP) 2691 dump_ump_info(buffer, client); 2692 #endif 2693 snd_seq_info_dump_ports(buffer, client); 2694 if (snd_seq_write_pool_allocated(client)) { 2695 snd_iprintf(buffer, " Output pool :\n"); 2696 snd_seq_info_pool(buffer, client->pool, " "); 2697 } 2698 if (client->type == USER_CLIENT && client->data.user.fifo && 2699 client->data.user.fifo->pool) { 2700 snd_iprintf(buffer, " Input pool :\n"); 2701 snd_seq_info_pool(buffer, client->data.user.fifo->pool, " "); 2702 } 2703 snd_seq_client_unlock(client); 2704 } 2705 } 2706 #endif /* CONFIG_SND_PROC_FS */ 2707 2708 /*---------------------------------------------------------------------------*/ 2709 2710 2711 /* 2712 * REGISTRATION PART 2713 */ 2714 2715 static const struct file_operations snd_seq_f_ops = 2716 { 2717 .owner = THIS_MODULE, 2718 .read = snd_seq_read, 2719 .write = snd_seq_write, 2720 .open = snd_seq_open, 2721 .release = snd_seq_release, 2722 .llseek = no_llseek, 2723 .poll = snd_seq_poll, 2724 .unlocked_ioctl = snd_seq_ioctl, 2725 .compat_ioctl = snd_seq_ioctl_compat, 2726 }; 2727 2728 static struct device *seq_dev; 2729 2730 /* 2731 * register sequencer device 2732 */ 2733 int __init snd_sequencer_device_init(void) 2734 { 2735 int err; 2736 2737 err = snd_device_alloc(&seq_dev, NULL); 2738 if (err < 0) 2739 return err; 2740 dev_set_name(seq_dev, "seq"); 2741 2742 mutex_lock(®ister_mutex); 2743 err = snd_register_device(SNDRV_DEVICE_TYPE_SEQUENCER, NULL, 0, 2744 &snd_seq_f_ops, NULL, seq_dev); 2745 mutex_unlock(®ister_mutex); 2746 if (err < 0) { 2747 put_device(seq_dev); 2748 return err; 2749 } 2750 2751 return 0; 2752 } 2753 2754 2755 2756 /* 2757 * unregister sequencer device 2758 */ 2759 void snd_sequencer_device_done(void) 2760 { 2761 snd_unregister_device(seq_dev); 2762 put_device(seq_dev); 2763 } 2764