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ALSA: usb-audio: Kill stray URB at exiting
[linux-2.6-block.git] / sound / core / seq / seq_clientmgr.c
CommitLineData
1da177e4
LT		 1/*
2 * ALSA sequencer Client Manager
3 * Copyright (c) 1998-2001 by Frank van de Pol <fvdpol@coil.demon.nl>
c1017a4c 4 * Jaroslav Kysela <perex@perex.cz>
1da177e4
LT		 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
1da177e4 24#include <linux/init.h>
d81a6d71 25#include <linux/export.h>
1da177e4
LT		 26#include <linux/slab.h>
27#include <sound/core.h>
28#include <sound/minors.h>
29#include <linux/kmod.h>
30
31#include <sound/seq_kernel.h>
32#include "seq_clientmgr.h"
33#include "seq_memory.h"
34#include "seq_queue.h"
35#include "seq_timer.h"
36#include "seq_info.h"
37#include "seq_system.h"
38#include <sound/seq_device.h>
39#ifdef CONFIG_COMPAT
40#include <linux/compat.h>
41#endif
42
43/* Client Manager
44
45 * this module handles the connections of userland and kernel clients
46 *
47 */
48
aa1e77e6
CL		 49/*
50 * There are four ranges of client numbers (last two shared):
51 * 0..15: global clients
52 * 16..127: statically allocated client numbers for cards 0..27
53 * 128..191: dynamically allocated client numbers for cards 28..31
54 * 128..191: dynamically allocated client numbers for applications
55 */
56
57/* number of kernel non-card clients */
58#define SNDRV_SEQ_GLOBAL_CLIENTS 16
59/* clients per cards, for static clients */
60#define SNDRV_SEQ_CLIENTS_PER_CARD 4
61/* dynamically allocated client numbers (both kernel drivers and user space) */
62#define SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN 128
d001544d 63
1da177e4
LT		 64#define SNDRV_SEQ_LFLG_INPUT 0x0001
65#define SNDRV_SEQ_LFLG_OUTPUT 0x0002
66#define SNDRV_SEQ_LFLG_OPEN (SNDRV_SEQ_LFLG_INPUT|SNDRV_SEQ_LFLG_OUTPUT)
67
68static DEFINE_SPINLOCK(clients_lock);
1a60d4c5 69static DEFINE_MUTEX(register_mutex);
1da177e4
LT		 70
71/*
72 * client table
73 */
74static char clienttablock[SNDRV_SEQ_MAX_CLIENTS];
c7e0b5bf
TI		 75static struct snd_seq_client *clienttab[SNDRV_SEQ_MAX_CLIENTS];
76static struct snd_seq_usage client_usage;
1da177e4
LT		 77
78/*
79 * prototypes
80 */
c7e0b5bf
TI		 81static int bounce_error_event(struct snd_seq_client *client,
82 struct snd_seq_event *event,
83 int err, int atomic, int hop);
84static int snd_seq_deliver_single_event(struct snd_seq_client *client,
85 struct snd_seq_event *event,
86 int filter, int atomic, int hop);
1da177e4 87
1da177e4
LT		 88/*
89 */
90static inline unsigned short snd_seq_file_flags(struct file *file)
91{
92 switch (file->f_mode & (FMODE_READ | FMODE_WRITE)) {
93 case FMODE_WRITE:
94 return SNDRV_SEQ_LFLG_OUTPUT;
95 case FMODE_READ:
96 return SNDRV_SEQ_LFLG_INPUT;
97 default:
98 return SNDRV_SEQ_LFLG_OPEN;
99 }
100}
101
c7e0b5bf 102static inline int snd_seq_write_pool_allocated(struct snd_seq_client *client)
1da177e4
LT		 103{
104 return snd_seq_total_cells(client->pool) > 0;
105}
106
107/* return pointer to client structure for specified id */
c7e0b5bf 108static struct snd_seq_client *clientptr(int clientid)
1da177e4
LT		 109{
110 if (clientid < 0 || clientid >= SNDRV_SEQ_MAX_CLIENTS) {
04cc79a0 111 pr_debug("ALSA: seq: oops. Trying to get pointer to client %d\n",
c7e0b5bf 112 clientid);
1da177e4
LT		 113 return NULL;
114 }
115 return clienttab[clientid];
116}
117
c7e0b5bf 118struct snd_seq_client *snd_seq_client_use_ptr(int clientid)
1da177e4
LT		 119{
120 unsigned long flags;
c7e0b5bf 121 struct snd_seq_client *client;
1da177e4
LT		 122
123 if (clientid < 0 || clientid >= SNDRV_SEQ_MAX_CLIENTS) {
04cc79a0 124 pr_debug("ALSA: seq: oops. Trying to get pointer to client %d\n",
c7e0b5bf 125 clientid);
1da177e4
LT		 126 return NULL;
127 }
128 spin_lock_irqsave(&clients_lock, flags);
129 client = clientptr(clientid);
130 if (client)
131 goto __lock;
132 if (clienttablock[clientid]) {
133 spin_unlock_irqrestore(&clients_lock, flags);
134 return NULL;
135 }
136 spin_unlock_irqrestore(&clients_lock, flags);
ee2da997 137#ifdef CONFIG_MODULES
0d63e4f9 138 if (!in_interrupt()) {
aa1e77e6 139 static char client_requested[SNDRV_SEQ_GLOBAL_CLIENTS];
1da177e4 140 static char card_requested[SNDRV_CARDS];
aa1e77e6 141 if (clientid < SNDRV_SEQ_GLOBAL_CLIENTS) {
1da177e4
LT		 142 int idx;
143
0d63e4f9 144 if (!client_requested[clientid]) {
1da177e4 145 client_requested[clientid] = 1;
aa1e77e6 146 for (idx = 0; idx < 15; idx++) {
1da177e4
LT		 147 if (seq_client_load[idx] < 0)
148 break;
149 if (seq_client_load[idx] == clientid) {
c7e0b5bf
TI		 150 request_module("snd-seq-client-%i",
151 clientid);
1da177e4
LT		 152 break;
153 }
154 }
155 }
aa1e77e6
CL		 156 } else if (clientid < SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN) {
157 int card = (clientid - SNDRV_SEQ_GLOBAL_CLIENTS) /
158 SNDRV_SEQ_CLIENTS_PER_CARD;
1da177e4
LT		 159 if (card < snd_ecards_limit) {
160 if (! card_requested[card]) {
161 card_requested[card] = 1;
162 snd_request_card(card);
163 }
164 snd_seq_device_load_drivers();
165 }
166 }
167 spin_lock_irqsave(&clients_lock, flags);
168 client = clientptr(clientid);
169 if (client)
170 goto __lock;
171 spin_unlock_irqrestore(&clients_lock, flags);
172 }
173#endif
174 return NULL;
175
176 __lock:
177 snd_use_lock_use(&client->use_lock);
178 spin_unlock_irqrestore(&clients_lock, flags);
179 return client;
180}
181
c7e0b5bf 182static void usage_alloc(struct snd_seq_usage *res, int num)
1da177e4
LT		 183{
184 res->cur += num;
185 if (res->cur > res->peak)
186 res->peak = res->cur;
187}
188
c7e0b5bf 189static void usage_free(struct snd_seq_usage *res, int num)
1da177e4
LT		 190{
191 res->cur -= num;
192}
193
194/* initialise data structures */
195int __init client_init_data(void)
196{
197 /* zap out the client table */
198 memset(&clienttablock, 0, sizeof(clienttablock));
199 memset(&clienttab, 0, sizeof(clienttab));
200 return 0;
201}
202
203
aa1e77e6 204static struct snd_seq_client *seq_create_client1(int client_index, int poolsize)
1da177e4
LT		 205{
206 unsigned long flags;
207 int c;
c7e0b5bf 208 struct snd_seq_client *client;
1da177e4
LT		 209
210 /* init client data */
ecca82b4 211 client = kzalloc(sizeof(*client), GFP_KERNEL);
1da177e4
LT		 212 if (client == NULL)
213 return NULL;
214 client->pool = snd_seq_pool_new(poolsize);
215 if (client->pool == NULL) {
216 kfree(client);
217 return NULL;
218 }
219 client->type = NO_CLIENT;
220 snd_use_lock_init(&client->use_lock);
221 rwlock_init(&client->ports_lock);
1a60d4c5 222 mutex_init(&client->ports_mutex);
1da177e4
LT		 223 INIT_LIST_HEAD(&client->ports_list_head);
224
225 /* find free slot in the client table */
226 spin_lock_irqsave(&clients_lock, flags);
227 if (client_index < 0) {
aa1e77e6
CL		 228 for (c = SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN;
229 c < SNDRV_SEQ_MAX_CLIENTS;
230 c++) {
1da177e4
LT		 231 if (clienttab[c] || clienttablock[c])
232 continue;
233 clienttab[client->number = c] = client;
234 spin_unlock_irqrestore(&clients_lock, flags);
235 return client;
236 }
237 } else {
238 if (clienttab[client_index] == NULL && !clienttablock[client_index]) {
239 clienttab[client->number = client_index] = client;
240 spin_unlock_irqrestore(&clients_lock, flags);
241 return client;
242 }
243 }
244 spin_unlock_irqrestore(&clients_lock, flags);
245 snd_seq_pool_delete(&client->pool);
246 kfree(client);
247 return NULL; /* no free slot found or busy, return failure code */
248}
249
250
c7e0b5bf 251static int seq_free_client1(struct snd_seq_client *client)
1da177e4
LT		 252{
253 unsigned long flags;
254
7eaa943c
TI		 255 if (!client)
256 return 0;
1da177e4
LT		 257 snd_seq_delete_all_ports(client);
258 snd_seq_queue_client_leave(client->number);
259 spin_lock_irqsave(&clients_lock, flags);
260 clienttablock[client->number] = 1;
261 clienttab[client->number] = NULL;
262 spin_unlock_irqrestore(&clients_lock, flags);
263 snd_use_lock_sync(&client->use_lock);
264 snd_seq_queue_client_termination(client->number);
265 if (client->pool)
266 snd_seq_pool_delete(&client->pool);
267 spin_lock_irqsave(&clients_lock, flags);
268 clienttablock[client->number] = 0;
269 spin_unlock_irqrestore(&clients_lock, flags);
270 return 0;
271}
272
273
c7e0b5bf 274static void seq_free_client(struct snd_seq_client * client)
1da177e4 275{
1a60d4c5 276 mutex_lock(&register_mutex);
1da177e4
LT		 277 switch (client->type) {
278 case NO_CLIENT:
04cc79a0
TI		 279 pr_warn("ALSA: seq: Trying to free unused client %d\n",
280 client->number);
1da177e4
LT		 281 break;
282 case USER_CLIENT:
283 case KERNEL_CLIENT:
284 seq_free_client1(client);
285 usage_free(&client_usage, 1);
286 break;
287
288 default:
04cc79a0 289 pr_err("ALSA: seq: Trying to free client %d with undefined type = %d\n",
c7e0b5bf 290 client->number, client->type);
1da177e4 291 }
1a60d4c5 292 mutex_unlock(&register_mutex);
1da177e4
LT		 293
294 snd_seq_system_client_ev_client_exit(client->number);
295}
296
297
298
299/* -------------------------------------------------------- */
300
301/* create a user client */
302static int snd_seq_open(struct inode *inode, struct file *file)
303{
304 int c, mode; /* client id */
c7e0b5bf
TI		 305 struct snd_seq_client *client;
306 struct snd_seq_user_client *user;
02f4865f
TI		 307 int err;
308
309 err = nonseekable_open(inode, file);
310 if (err < 0)
311 return err;
1da177e4 312
1a60d4c5 313 if (mutex_lock_interruptible(&register_mutex))
1da177e4 314 return -ERESTARTSYS;
aa1e77e6 315 client = seq_create_client1(-1, SNDRV_SEQ_DEFAULT_EVENTS);
1da177e4 316 if (client == NULL) {
1a60d4c5 317 mutex_unlock(&register_mutex);
1da177e4
LT		 318 return -ENOMEM; /* failure code */
319 }
320
321 mode = snd_seq_file_flags(file);
322 if (mode & SNDRV_SEQ_LFLG_INPUT)
323 client->accept_input = 1;
324 if (mode & SNDRV_SEQ_LFLG_OUTPUT)
325 client->accept_output = 1;
326
327 user = &client->data.user;
328 user->fifo = NULL;
329 user->fifo_pool_size = 0;
330
331 if (mode & SNDRV_SEQ_LFLG_INPUT) {
332 user->fifo_pool_size = SNDRV_SEQ_DEFAULT_CLIENT_EVENTS;
333 user->fifo = snd_seq_fifo_new(user->fifo_pool_size);
334 if (user->fifo == NULL) {
335 seq_free_client1(client);
336 kfree(client);
1a60d4c5 337 mutex_unlock(&register_mutex);
1da177e4
LT		 338 return -ENOMEM;
339 }
340 }
341
342 usage_alloc(&client_usage, 1);
343 client->type = USER_CLIENT;
1a60d4c5 344 mutex_unlock(&register_mutex);
1da177e4
LT		 345
346 c = client->number;
347 file->private_data = client;
348
349 /* fill client data */
350 user->file = file;
351 sprintf(client->name, "Client-%d", c);
a1ce94d0 352 client->data.user.owner = get_pid(task_pid(current));
1da177e4
LT		 353
354 /* make others aware this new client */
355 snd_seq_system_client_ev_client_start(c);
356
357 return 0;
358}
359
360/* delete a user client */
361static int snd_seq_release(struct inode *inode, struct file *file)
362{
c7e0b5bf 363 struct snd_seq_client *client = file->private_data;
1da177e4
LT		 364
365 if (client) {
366 seq_free_client(client);
367 if (client->data.user.fifo)
368 snd_seq_fifo_delete(&client->data.user.fifo);
a1ce94d0 369 put_pid(client->data.user.owner);
1da177e4
LT		 370 kfree(client);
371 }
372
373 return 0;
374}
375
376
377/* handle client read() */
378/* possible error values:
379 * -ENXIO invalid client or file open mode
380 * -ENOSPC FIFO overflow (the flag is cleared after this error report)
381 * -EINVAL no enough user-space buffer to write the whole event
382 * -EFAULT seg. fault during copy to user space
383 */
c7e0b5bf
TI		 384static ssize_t snd_seq_read(struct file *file, char __user *buf, size_t count,
385 loff_t *offset)
1da177e4 386{
c7e0b5bf
TI		 387 struct snd_seq_client *client = file->private_data;
388 struct snd_seq_fifo *fifo;
1da177e4
LT		 389 int err;
390 long result = 0;
c7e0b5bf 391 struct snd_seq_event_cell *cell;
1da177e4
LT		 392
393 if (!(snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_INPUT))
394 return -ENXIO;
395
396 if (!access_ok(VERIFY_WRITE, buf, count))
397 return -EFAULT;
398
399 /* check client structures are in place */
7eaa943c
TI		 400 if (snd_BUG_ON(!client))
401 return -ENXIO;
1da177e4
LT		 402
403 if (!client->accept_input || (fifo = client->data.user.fifo) == NULL)
404 return -ENXIO;
405
406 if (atomic_read(&fifo->overflow) > 0) {
407 /* buffer overflow is detected */
408 snd_seq_fifo_clear(fifo);
409 /* return error code */
410 return -ENOSPC;
411 }
412
413 cell = NULL;
414 err = 0;
415 snd_seq_fifo_lock(fifo);
416
417 /* while data available in queue */
c7e0b5bf 418 while (count >= sizeof(struct snd_seq_event)) {
1da177e4
LT		 419 int nonblock;
420
421 nonblock = (file->f_flags & O_NONBLOCK) || result > 0;
422 if ((err = snd_seq_fifo_cell_out(fifo, &cell, nonblock)) < 0) {
423 break;
424 }
425 if (snd_seq_ev_is_variable(&cell->event)) {
c7e0b5bf 426 struct snd_seq_event tmpev;
1da177e4
LT		 427 tmpev = cell->event;
428 tmpev.data.ext.len &= ~SNDRV_SEQ_EXT_MASK;
c7e0b5bf 429 if (copy_to_user(buf, &tmpev, sizeof(struct snd_seq_event))) {
1da177e4
LT		 430 err = -EFAULT;
431 break;
432 }
c7e0b5bf
TI		 433 count -= sizeof(struct snd_seq_event);
434 buf += sizeof(struct snd_seq_event);
4d23359b
CL		 435 err = snd_seq_expand_var_event(&cell->event, count,
436 (char __force *)buf, 0,
c7e0b5bf 437 sizeof(struct snd_seq_event));
1da177e4
LT		 438 if (err < 0)
439 break;
440 result += err;
441 count -= err;
442 buf += err;
443 } else {
c7e0b5bf 444 if (copy_to_user(buf, &cell->event, sizeof(struct snd_seq_event))) {
1da177e4
LT		 445 err = -EFAULT;
446 break;
447 }
c7e0b5bf
TI		 448 count -= sizeof(struct snd_seq_event);
449 buf += sizeof(struct snd_seq_event);
1da177e4
LT		 450 }
451 snd_seq_cell_free(cell);
452 cell = NULL; /* to be sure */
c7e0b5bf 453 result += sizeof(struct snd_seq_event);
1da177e4
LT		 454 }
455
456 if (err < 0) {
457 if (cell)
458 snd_seq_fifo_cell_putback(fifo, cell);
459 if (err == -EAGAIN && result > 0)
460 err = 0;
461 }
462 snd_seq_fifo_unlock(fifo);
463
464 return (err < 0) ? err : result;
465}
466
467
468/*
469 * check access permission to the port
470 */
c7e0b5bf 471static int check_port_perm(struct snd_seq_client_port *port, unsigned int flags)
1da177e4
LT		 472{
473 if ((port->capability & flags) != flags)
474 return 0;
475 return flags;
476}
477
478/*
479 * check if the destination client is available, and return the pointer
480 * if filter is non-zero, client filter bitmap is tested.
481 */
c7e0b5bf
TI		 482static struct snd_seq_client *get_event_dest_client(struct snd_seq_event *event,
483 int filter)
1da177e4 484{
c7e0b5bf 485 struct snd_seq_client *dest;
1da177e4
LT		 486
487 dest = snd_seq_client_use_ptr(event->dest.client);
488 if (dest == NULL)
489 return NULL;
490 if (! dest->accept_input)
491 goto __not_avail;
492 if ((dest->filter & SNDRV_SEQ_FILTER_USE_EVENT) &&
493 ! test_bit(event->type, dest->event_filter))
494 goto __not_avail;
495 if (filter && !(dest->filter & filter))
496 goto __not_avail;
497
498 return dest; /* ok - accessible */
499__not_avail:
500 snd_seq_client_unlock(dest);
501 return NULL;
502}
503
504
505/*
506 * Return the error event.
507 *
508 * If the receiver client is a user client, the original event is
509 * encapsulated in SNDRV_SEQ_EVENT_BOUNCE as variable length event. If
510 * the original event is also variable length, the external data is
511 * copied after the event record.
512 * If the receiver client is a kernel client, the original event is
513 * quoted in SNDRV_SEQ_EVENT_KERNEL_ERROR, since this requires no extra
514 * kmalloc.
515 */
c7e0b5bf
TI		 516static int bounce_error_event(struct snd_seq_client *client,
517 struct snd_seq_event *event,
1da177e4
LT		 518 int err, int atomic, int hop)
519{
c7e0b5bf 520 struct snd_seq_event bounce_ev;
1da177e4
LT		 521 int result;
522
523 if (client == NULL ||
524 ! (client->filter & SNDRV_SEQ_FILTER_BOUNCE) ||
525 ! client->accept_input)
526 return 0; /* ignored */
527
528 /* set up quoted error */
529 memset(&bounce_ev, 0, sizeof(bounce_ev));
530 bounce_ev.type = SNDRV_SEQ_EVENT_KERNEL_ERROR;
531 bounce_ev.flags = SNDRV_SEQ_EVENT_LENGTH_FIXED;
532 bounce_ev.queue = SNDRV_SEQ_QUEUE_DIRECT;
533 bounce_ev.source.client = SNDRV_SEQ_CLIENT_SYSTEM;
534 bounce_ev.source.port = SNDRV_SEQ_PORT_SYSTEM_ANNOUNCE;
535 bounce_ev.dest.client = client->number;
536 bounce_ev.dest.port = event->source.port;
537 bounce_ev.data.quote.origin = event->dest;
538 bounce_ev.data.quote.event = event;
539 bounce_ev.data.quote.value = -err; /* use positive value */
540 result = snd_seq_deliver_single_event(NULL, &bounce_ev, 0, atomic, hop + 1);
541 if (result < 0) {
542 client->event_lost++;
543 return result;
544 }
545
546 return result;
547}
548
549
550/*
551 * rewrite the time-stamp of the event record with the curren time
552 * of the given queue.
553 * return non-zero if updated.
554 */
c7e0b5bf
TI		 555static int update_timestamp_of_queue(struct snd_seq_event *event,
556 int queue, int real_time)
1da177e4 557{
c7e0b5bf 558 struct snd_seq_queue *q;
1da177e4
LT		 559
560 q = queueptr(queue);
561 if (! q)
562 return 0;
563 event->queue = queue;
564 event->flags &= ~SNDRV_SEQ_TIME_STAMP_MASK;
565 if (real_time) {
566 event->time.time = snd_seq_timer_get_cur_time(q->timer);
567 event->flags |= SNDRV_SEQ_TIME_STAMP_REAL;
568 } else {
569 event->time.tick = snd_seq_timer_get_cur_tick(q->timer);
570 event->flags |= SNDRV_SEQ_TIME_STAMP_TICK;
571 }
572 queuefree(q);
573 return 1;
574}
575
576
577/*
578 * deliver an event to the specified destination.
579 * if filter is non-zero, client filter bitmap is tested.
580 *
581 * RETURN VALUE: 0 : if succeeded
582 * <0 : error
583 */
c7e0b5bf
TI		 584static int snd_seq_deliver_single_event(struct snd_seq_client *client,
585 struct snd_seq_event *event,
1da177e4
LT		 586 int filter, int atomic, int hop)
587{
c7e0b5bf
TI		 588 struct snd_seq_client *dest = NULL;
589 struct snd_seq_client_port *dest_port = NULL;
1da177e4
LT		 590 int result = -ENOENT;
591 int direct;
592
593 direct = snd_seq_ev_is_direct(event);
594
595 dest = get_event_dest_client(event, filter);
596 if (dest == NULL)
597 goto __skip;
598 dest_port = snd_seq_port_use_ptr(dest, event->dest.port);
599 if (dest_port == NULL)
600 goto __skip;
601
602 /* check permission */
603 if (! check_port_perm(dest_port, SNDRV_SEQ_PORT_CAP_WRITE)) {
604 result = -EPERM;
605 goto __skip;
606 }
607
608 if (dest_port->timestamping)
609 update_timestamp_of_queue(event, dest_port->time_queue,
610 dest_port->time_real);
611
612 switch (dest->type) {
613 case USER_CLIENT:
614 if (dest->data.user.fifo)
615 result = snd_seq_fifo_event_in(dest->data.user.fifo, event);
616 break;
617
618 case KERNEL_CLIENT:
619 if (dest_port->event_input == NULL)
620 break;
c7e0b5bf
TI		 621 result = dest_port->event_input(event, direct,
622 dest_port->private_data,
623 atomic, hop);
1da177e4
LT		 624 break;
625 default:
626 break;
627 }
628
629 __skip:
630 if (dest_port)
631 snd_seq_port_unlock(dest_port);
632 if (dest)
633 snd_seq_client_unlock(dest);
634
635 if (result < 0 && !direct) {
636 result = bounce_error_event(client, event, result, atomic, hop);
637 }
638 return result;
639}
640
641
642/*
643 * send the event to all subscribers:
644 */
c7e0b5bf
TI		 645static int deliver_to_subscribers(struct snd_seq_client *client,
646 struct snd_seq_event *event,
1da177e4
LT		 647 int atomic, int hop)
648{
c7e0b5bf 649 struct snd_seq_subscribers *subs;
27423257 650 int err, result = 0, num_ev = 0;
c7e0b5bf
TI		 651 struct snd_seq_event event_saved;
652 struct snd_seq_client_port *src_port;
c7e0b5bf 653 struct snd_seq_port_subs_info *grp;
1da177e4
LT		 654
655 src_port = snd_seq_port_use_ptr(client, event->source.port);
656 if (src_port == NULL)
657 return -EINVAL; /* invalid source port */
658 /* save original event record */
659 event_saved = *event;
660 grp = &src_port->c_src;
661
662 /* lock list */
663 if (atomic)
664 read_lock(&grp->list_lock);
665 else
666 down_read(&grp->list_mutex);
9244b2c3 667 list_for_each_entry(subs, &grp->list_head, src_list) {
7f0973e9
TI		 668 /* both ports ready? */
669 if (atomic_read(&subs->ref_count) != 2)
670 continue;
1da177e4
LT		 671 event->dest = subs->info.dest;
672 if (subs->info.flags & SNDRV_SEQ_PORT_SUBS_TIMESTAMP)
673 /* convert time according to flag with subscription */
674 update_timestamp_of_queue(event, subs->info.queue,
675 subs->info.flags & SNDRV_SEQ_PORT_SUBS_TIME_REAL);
676 err = snd_seq_deliver_single_event(client, event,
677 0, atomic, hop);
27423257
AG		 678 if (err < 0) {
679 /* save first error that occurs and continue */
680 if (!result)
681 result = err;
682 continue;
683 }
1da177e4
LT		 684 num_ev++;
685 /* restore original event record */
686 *event = event_saved;
687 }
688 if (atomic)
689 read_unlock(&grp->list_lock);
690 else
691 up_read(&grp->list_mutex);
692 *event = event_saved; /* restore */
693 snd_seq_port_unlock(src_port);
27423257 694 return (result < 0) ? result : num_ev;
1da177e4
LT		 695}
696
697
698#ifdef SUPPORT_BROADCAST
699/*
700 * broadcast to all ports:
701 */
c7e0b5bf
TI		 702static int port_broadcast_event(struct snd_seq_client *client,
703 struct snd_seq_event *event,
1da177e4
LT		 704 int atomic, int hop)
705{
27423257 706 int num_ev = 0, err, result = 0;
c7e0b5bf 707 struct snd_seq_client *dest_client;
9244b2c3 708 struct snd_seq_client_port *port;
1da177e4
LT		 709
710 dest_client = get_event_dest_client(event, SNDRV_SEQ_FILTER_BROADCAST);
711 if (dest_client == NULL)
712 return 0; /* no matching destination */
713
714 read_lock(&dest_client->ports_lock);
9244b2c3 715 list_for_each_entry(port, &dest_client->ports_list_head, list) {
1da177e4
LT		 716 event->dest.port = port->addr.port;
717 /* pass NULL as source client to avoid error bounce */
718 err = snd_seq_deliver_single_event(NULL, event,
719 SNDRV_SEQ_FILTER_BROADCAST,
720 atomic, hop);
27423257
AG		 721 if (err < 0) {
722 /* save first error that occurs and continue */
723 if (!result)
724 result = err;
725 continue;
726 }
1da177e4
LT		 727 num_ev++;
728 }
729 read_unlock(&dest_client->ports_lock);
730 snd_seq_client_unlock(dest_client);
731 event->dest.port = SNDRV_SEQ_ADDRESS_BROADCAST; /* restore */
27423257 732 return (result < 0) ? result : num_ev;
1da177e4
LT		 733}
734
735/*
736 * send the event to all clients:
737 * if destination port is also ADDRESS_BROADCAST, deliver to all ports.
738 */
c7e0b5bf
TI		 739static int broadcast_event(struct snd_seq_client *client,
740 struct snd_seq_event *event, int atomic, int hop)
1da177e4 741{
27423257 742 int err, result = 0, num_ev = 0;
1da177e4 743 int dest;
c7e0b5bf 744 struct snd_seq_addr addr;
1da177e4
LT		 745
746 addr = event->dest; /* save */
747
748 for (dest = 0; dest < SNDRV_SEQ_MAX_CLIENTS; dest++) {
749 /* don't send to itself */
750 if (dest == client->number)
751 continue;
752 event->dest.client = dest;
753 event->dest.port = addr.port;
754 if (addr.port == SNDRV_SEQ_ADDRESS_BROADCAST)
755 err = port_broadcast_event(client, event, atomic, hop);
756 else
757 /* pass NULL as source client to avoid error bounce */
758 err = snd_seq_deliver_single_event(NULL, event,
759 SNDRV_SEQ_FILTER_BROADCAST,
760 atomic, hop);
27423257
AG		 761 if (err < 0) {
762 /* save first error that occurs and continue */
763 if (!result)
764 result = err;
765 continue;
766 }
1da177e4
LT		 767 num_ev += err;
768 }
769 event->dest = addr; /* restore */
27423257 770 return (result < 0) ? result : num_ev;
1da177e4
LT		 771}
772
773
774/* multicast - not supported yet */
c7e0b5bf 775static int multicast_event(struct snd_seq_client *client, struct snd_seq_event *event,
1da177e4
LT		 776 int atomic, int hop)
777{
04cc79a0 778 pr_debug("ALSA: seq: multicast not supported yet.\n");
1da177e4
LT		 779 return 0; /* ignored */
780}
781#endif /* SUPPORT_BROADCAST */
782
783
784/* deliver an event to the destination port(s).
785 * if the event is to subscribers or broadcast, the event is dispatched
786 * to multiple targets.
787 *
788 * RETURN VALUE: n > 0 : the number of delivered events.
789 * n == 0 : the event was not passed to any client.
790 * n < 0 : error - event was not processed.
791 */
c7e0b5bf 792static int snd_seq_deliver_event(struct snd_seq_client *client, struct snd_seq_event *event,
1da177e4
LT		 793 int atomic, int hop)
794{
795 int result;
796
797 hop++;
798 if (hop >= SNDRV_SEQ_MAX_HOPS) {
04cc79a0 799 pr_debug("ALSA: seq: too long delivery path (%d:%d->%d:%d)\n",
1da177e4
LT		 800 event->source.client, event->source.port,
801 event->dest.client, event->dest.port);
802 return -EMLINK;
803 }
804
805 if (event->queue == SNDRV_SEQ_ADDRESS_SUBSCRIBERS ||
806 event->dest.client == SNDRV_SEQ_ADDRESS_SUBSCRIBERS)
807 result = deliver_to_subscribers(client, event, atomic, hop);
808#ifdef SUPPORT_BROADCAST
809 else if (event->queue == SNDRV_SEQ_ADDRESS_BROADCAST ||
810 event->dest.client == SNDRV_SEQ_ADDRESS_BROADCAST)
811 result = broadcast_event(client, event, atomic, hop);
812 else if (event->dest.client >= SNDRV_SEQ_MAX_CLIENTS)
813 result = multicast_event(client, event, atomic, hop);
814 else if (event->dest.port == SNDRV_SEQ_ADDRESS_BROADCAST)
815 result = port_broadcast_event(client, event, atomic, hop);
816#endif
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 */
c7e0b5bf 833int snd_seq_dispatch_event(struct snd_seq_event_cell *cell, int atomic, int hop)
1da177e4 834{
c7e0b5bf 835 struct snd_seq_client *client;
1da177e4
LT		 836 int result;
837
7eaa943c
TI		 838 if (snd_BUG_ON(!cell))
839 return -EINVAL;
1da177e4
LT		 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 (cell->event.type == SNDRV_SEQ_EVENT_NOTE) {
848 /* NOTE event:
849 * the event cell is re-used as a NOTE-OFF event and
850 * enqueued again.
851 */
c7e0b5bf 852 struct snd_seq_event tmpev, *ev;
1da177e4
LT		 853
854 /* reserve this event to enqueue note-off later */
855 tmpev = cell->event;
856 tmpev.type = SNDRV_SEQ_EVENT_NOTEON;
857 result = snd_seq_deliver_event(client, &tmpev, atomic, hop);
858
859 /*
860 * This was originally a note event. We now re-use the
861 * cell for the note-off event.
862 */
863
864 ev = &cell->event;
865 ev->type = SNDRV_SEQ_EVENT_NOTEOFF;
866 ev->flags |= SNDRV_SEQ_PRIORITY_HIGH;
867
868 /* add the duration time */
869 switch (ev->flags & SNDRV_SEQ_TIME_STAMP_MASK) {
870 case SNDRV_SEQ_TIME_STAMP_TICK:
871 ev->time.tick += ev->data.note.duration;
872 break;
873 case SNDRV_SEQ_TIME_STAMP_REAL:
874 /* unit for duration is ms */
875 ev->time.time.tv_nsec += 1000000 * (ev->data.note.duration % 1000);
876 ev->time.time.tv_sec += ev->data.note.duration / 1000 +
877 ev->time.time.tv_nsec / 1000000000;
878 ev->time.time.tv_nsec %= 1000000000;
879 break;
880 }
881 ev->data.note.velocity = ev->data.note.off_velocity;
882
883 /* Now queue this cell as the note off event */
884 if (snd_seq_enqueue_event(cell, atomic, hop) < 0)
885 snd_seq_cell_free(cell); /* release this cell */
886
887 } else {
888 /* Normal events:
889 * event cell is freed after processing the event
890 */
891
892 result = snd_seq_deliver_event(client, &cell->event, atomic, hop);
893 snd_seq_cell_free(cell);
894 }
895
896 snd_seq_client_unlock(client);
897 return result;
898}
899
900
901/* Allocate a cell from client pool and enqueue it to queue:
902 * if pool is empty and blocking is TRUE, sleep until a new cell is
903 * available.
904 */
c7e0b5bf
TI		 905static int snd_seq_client_enqueue_event(struct snd_seq_client *client,
906 struct snd_seq_event *event,
1da177e4
LT		 907 struct file *file, int blocking,
908 int atomic, int hop)
909{
c7e0b5bf 910 struct snd_seq_event_cell *cell;
1da177e4
LT		 911 int err;
912
913 /* special queue values - force direct passing */
914 if (event->queue == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) {
915 event->dest.client = SNDRV_SEQ_ADDRESS_SUBSCRIBERS;
916 event->queue = SNDRV_SEQ_QUEUE_DIRECT;
917 } else
918#ifdef SUPPORT_BROADCAST
919 if (event->queue == SNDRV_SEQ_ADDRESS_BROADCAST) {
920 event->dest.client = SNDRV_SEQ_ADDRESS_BROADCAST;
921 event->queue = SNDRV_SEQ_QUEUE_DIRECT;
922 }
923#endif
924 if (event->dest.client == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) {
925 /* check presence of source port */
c7e0b5bf 926 struct snd_seq_client_port *src_port = snd_seq_port_use_ptr(client, event->source.port);
1da177e4
LT		 927 if (src_port == NULL)
928 return -EINVAL;
929 snd_seq_port_unlock(src_port);
930 }
931
932 /* direct event processing without enqueued */
933 if (snd_seq_ev_is_direct(event)) {
934 if (event->type == SNDRV_SEQ_EVENT_NOTE)
935 return -EINVAL; /* this event must be enqueued! */
936 return snd_seq_deliver_event(client, event, atomic, hop);
937 }
938
939 /* Not direct, normal queuing */
940 if (snd_seq_queue_is_used(event->queue, client->number) <= 0)
941 return -EINVAL; /* invalid queue */
942 if (! snd_seq_write_pool_allocated(client))
943 return -ENXIO; /* queue is not allocated */
944
945 /* allocate an event cell */
946 err = snd_seq_event_dup(client->pool, event, &cell, !blocking || atomic, file);
947 if (err < 0)
948 return err;
949
950 /* we got a cell. enqueue it. */
951 if ((err = snd_seq_enqueue_event(cell, atomic, hop)) < 0) {
952 snd_seq_cell_free(cell);
953 return err;
954 }
955
956 return 0;
957}
958
959
960/*
961 * check validity of event type and data length.
962 * return non-zero if invalid.
963 */
c7e0b5bf 964static int check_event_type_and_length(struct snd_seq_event *ev)
1da177e4
LT		 965{
966 switch (snd_seq_ev_length_type(ev)) {
967 case SNDRV_SEQ_EVENT_LENGTH_FIXED:
968 if (snd_seq_ev_is_variable_type(ev))
969 return -EINVAL;
970 break;
971 case SNDRV_SEQ_EVENT_LENGTH_VARIABLE:
972 if (! snd_seq_ev_is_variable_type(ev) ||
973 (ev->data.ext.len & ~SNDRV_SEQ_EXT_MASK) >= SNDRV_SEQ_MAX_EVENT_LEN)
974 return -EINVAL;
975 break;
976 case SNDRV_SEQ_EVENT_LENGTH_VARUSR:
e5723b41 977 if (! snd_seq_ev_is_direct(ev))
1da177e4
LT		 978 return -EINVAL;
979 break;
980 }
981 return 0;
982}
983
984
985/* handle write() */
986/* possible error values:
987 * -ENXIO invalid client or file open mode
988 * -ENOMEM malloc failed
989 * -EFAULT seg. fault during copy from user space
990 * -EINVAL invalid event
991 * -EAGAIN no space in output pool
992 * -EINTR interrupts while sleep
993 * -EMLINK too many hops
994 * others depends on return value from driver callback
995 */
c7e0b5bf
TI		 996static ssize_t snd_seq_write(struct file *file, const char __user *buf,
997 size_t count, loff_t *offset)
1da177e4 998{
c7e0b5bf 999 struct snd_seq_client *client = file->private_data;
1da177e4
LT		 1000 int written = 0, len;
1001 int err = -EINVAL;
c7e0b5bf 1002 struct snd_seq_event event;
1da177e4
LT		 1003
1004 if (!(snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT))
1005 return -ENXIO;
1006
1007 /* check client structures are in place */
7eaa943c
TI		 1008 if (snd_BUG_ON(!client))
1009 return -ENXIO;
1da177e4
LT		 1010
1011 if (!client->accept_output || client->pool == NULL)
1012 return -ENXIO;
1013
1014 /* allocate the pool now if the pool is not allocated yet */
1015 if (client->pool->size > 0 && !snd_seq_write_pool_allocated(client)) {
1016 if (snd_seq_pool_init(client->pool) < 0)
1017 return -ENOMEM;
1018 }
1019
1020 /* only process whole events */
c7e0b5bf 1021 while (count >= sizeof(struct snd_seq_event)) {
1da177e4
LT		 1022 /* Read in the event header from the user */
1023 len = sizeof(event);
1024 if (copy_from_user(&event, buf, len)) {
1025 err = -EFAULT;
1026 break;
1027 }
1028 event.source.client = client->number; /* fill in client number */
1029 /* Check for extension data length */
1030 if (check_event_type_and_length(&event)) {
1031 err = -EINVAL;
1032 break;
1033 }
1034
1035 /* check for special events */
1036 if (event.type == SNDRV_SEQ_EVENT_NONE)
1037 goto __skip_event;
1038 else if (snd_seq_ev_is_reserved(&event)) {
1039 err = -EINVAL;
1040 break;
1041 }
1042
1043 if (snd_seq_ev_is_variable(&event)) {
1044 int extlen = event.data.ext.len & ~SNDRV_SEQ_EXT_MASK;
1045 if ((size_t)(extlen + len) > count) {
1046 /* back out, will get an error this time or next */
1047 err = -EINVAL;
1048 break;
1049 }
1050 /* set user space pointer */
1051 event.data.ext.len = extlen | SNDRV_SEQ_EXT_USRPTR;
4d23359b 1052 event.data.ext.ptr = (char __force *)buf
c7e0b5bf 1053 + sizeof(struct snd_seq_event);
1da177e4
LT		 1054 len += extlen; /* increment data length */
1055 } else {
1056#ifdef CONFIG_COMPAT
1057 if (client->convert32 && snd_seq_ev_is_varusr(&event)) {
fea952e5 1058 void *ptr = (void __force *)compat_ptr(event.data.raw32.d[1]);
1da177e4
LT		 1059 event.data.ext.ptr = ptr;
1060 }
1061#endif
1062 }
1063
1064 /* ok, enqueue it */
1065 err = snd_seq_client_enqueue_event(client, &event, file,
1066 !(file->f_flags & O_NONBLOCK),
1067 0, 0);
1068 if (err < 0)
1069 break;
1070
1071 __skip_event:
1072 /* Update pointers and counts */
1073 count -= len;
1074 buf += len;
1075 written += len;
1076 }
1077
1078 return written ? written : err;
1079}
1080
1081
1082/*
1083 * handle polling
1084 */
1085static unsigned int snd_seq_poll(struct file *file, poll_table * wait)
1086{
c7e0b5bf 1087 struct snd_seq_client *client = file->private_data;
1da177e4
LT		 1088 unsigned int mask = 0;
1089
1090 /* check client structures are in place */
7eaa943c
TI		 1091 if (snd_BUG_ON(!client))
1092 return -ENXIO;
1da177e4
LT		 1093
1094 if ((snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_INPUT) &&
1095 client->data.user.fifo) {
1096
1097 /* check if data is available in the outqueue */
1098 if (snd_seq_fifo_poll_wait(client->data.user.fifo, file, wait))
1099 mask |= POLLIN | POLLRDNORM;
1100 }
1101
1102 if (snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT) {
1103
1104 /* check if data is available in the pool */
1105 if (!snd_seq_write_pool_allocated(client) ||
1106 snd_seq_pool_poll_wait(client->pool, file, wait))
1107 mask |= POLLOUT | POLLWRNORM;
1108 }
1109
1110 return mask;
1111}
1112
1113
1114/*-----------------------------------------------------*/
1115
04a56dd8
TS		 1116static int snd_seq_ioctl_pversion(struct snd_seq_client *client, void *arg)
1117{
1118 int *pversion = arg;
1119
1120 *pversion = SNDRV_SEQ_VERSION;
1121 return 0;
1122}
1123
1124static int snd_seq_ioctl_client_id(struct snd_seq_client *client, void *arg)
1125{
1126 int *client_id = arg;
1127
1128 *client_id = client->number;
1129 return 0;
1130}
1da177e4
LT		 1131
1132/* SYSTEM_INFO ioctl() */
04a56dd8 1133static int snd_seq_ioctl_system_info(struct snd_seq_client *client, void *arg)
1da177e4 1134{
04a56dd8 1135 struct snd_seq_system_info *info = arg;
1da177e4 1136
04a56dd8 1137 memset(info, 0, sizeof(*info));
1da177e4 1138 /* fill the info fields */
04a56dd8
TS		 1139 info->queues = SNDRV_SEQ_MAX_QUEUES;
1140 info->clients = SNDRV_SEQ_MAX_CLIENTS;
1141 info->ports = SNDRV_SEQ_MAX_PORTS;
1142 info->channels = 256; /* fixed limit */
1143 info->cur_clients = client_usage.cur;
1144 info->cur_queues = snd_seq_queue_get_cur_queues();
1145
1da177e4
LT		 1146 return 0;
1147}
1148
1149
1150/* RUNNING_MODE ioctl() */
04a56dd8 1151static int snd_seq_ioctl_running_mode(struct snd_seq_client *client, void *arg)
1da177e4 1152{
04a56dd8 1153 struct snd_seq_running_info *info = arg;
c7e0b5bf 1154 struct snd_seq_client *cptr;
1da177e4
LT		 1155 int err = 0;
1156
1da177e4 1157 /* requested client number */
04a56dd8 1158 cptr = snd_seq_client_use_ptr(info->client);
1da177e4
LT		 1159 if (cptr == NULL)
1160 return -ENOENT; /* don't change !!! */
1161
1162#ifdef SNDRV_BIG_ENDIAN
04a56dd8 1163 if (!info->big_endian) {
1da177e4
LT		 1164 err = -EINVAL;
1165 goto __err;
1166 }
1167#else
04a56dd8 1168 if (info->big_endian) {
1da177e4
LT		 1169 err = -EINVAL;
1170 goto __err;
1171 }
1172
1173#endif
04a56dd8 1174 if (info->cpu_mode > sizeof(long)) {
1da177e4
LT		 1175 err = -EINVAL;
1176 goto __err;
1177 }
04a56dd8 1178 cptr->convert32 = (info->cpu_mode < sizeof(long));
1da177e4
LT		 1179 __err:
1180 snd_seq_client_unlock(cptr);
1181 return err;
1182}
1183
1184/* CLIENT_INFO ioctl() */
c7e0b5bf
TI		 1185static void get_client_info(struct snd_seq_client *cptr,
1186 struct snd_seq_client_info *info)
1da177e4
LT		 1187{
1188 info->client = cptr->number;
1189
1190 /* fill the info fields */
1191 info->type = cptr->type;
1192 strcpy(info->name, cptr->name);
1193 info->filter = cptr->filter;
1194 info->event_lost = cptr->event_lost;
1195 memcpy(info->event_filter, cptr->event_filter, 32);
1196 info->num_ports = cptr->num_ports;
a1ce94d0
MK		 1197
1198 if (cptr->type == USER_CLIENT)
1199 info->pid = pid_vnr(cptr->data.user.owner);
1200 else
1201 info->pid = -1;
1202
1203 if (cptr->type == KERNEL_CLIENT)
1204 info->card = cptr->data.kernel.card ? cptr->data.kernel.card->number : -1;
1205 else
1206 info->card = -1;
1207
1da177e4
LT		 1208 memset(info->reserved, 0, sizeof(info->reserved));
1209}
1210
c7e0b5bf 1211static int snd_seq_ioctl_get_client_info(struct snd_seq_client *client,
04a56dd8 1212 void *arg)
1da177e4 1213{
04a56dd8 1214 struct snd_seq_client_info *client_info = arg;
c7e0b5bf 1215 struct snd_seq_client *cptr;
1da177e4
LT		 1216
1217 /* requested client number */
04a56dd8 1218 cptr = snd_seq_client_use_ptr(client_info->client);
1da177e4
LT		 1219 if (cptr == NULL)
1220 return -ENOENT; /* don't change !!! */
1221
04a56dd8 1222 get_client_info(cptr, client_info);
1da177e4
LT		 1223 snd_seq_client_unlock(cptr);
1224
1da177e4
LT		 1225 return 0;
1226}
1227
1228
1229/* CLIENT_INFO ioctl() */
c7e0b5bf 1230static int snd_seq_ioctl_set_client_info(struct snd_seq_client *client,
04a56dd8 1231 void *arg)
1da177e4 1232{
04a56dd8 1233 struct snd_seq_client_info *client_info = arg;
1da177e4
LT		 1234
1235 /* it is not allowed to set the info fields for an another client */
04a56dd8 1236 if (client->number != client_info->client)
1da177e4
LT		 1237 return -EPERM;
1238 /* also client type must be set now */
04a56dd8 1239 if (client->type != client_info->type)
1da177e4
LT		 1240 return -EINVAL;
1241
1242 /* fill the info fields */
04a56dd8
TS		 1243 if (client_info->name[0])
1244 strlcpy(client->name, client_info->name, sizeof(client->name));
1da177e4 1245
04a56dd8
TS		 1246 client->filter = client_info->filter;
1247 client->event_lost = client_info->event_lost;
1248 memcpy(client->event_filter, client_info->event_filter, 32);
1da177e4
LT		 1249
1250 return 0;
1251}
1252
1253
1254/*
1255 * CREATE PORT ioctl()
1256 */
04a56dd8 1257static int snd_seq_ioctl_create_port(struct snd_seq_client *client, void *arg)
1da177e4 1258{
04a56dd8 1259 struct snd_seq_port_info *info = arg;
c7e0b5bf 1260 struct snd_seq_client_port *port;
c7e0b5bf 1261 struct snd_seq_port_callback *callback;
1da177e4 1262
1da177e4 1263 /* it is not allowed to create the port for an another client */
04a56dd8 1264 if (info->addr.client != client->number)
1da177e4
LT		 1265 return -EPERM;
1266
04a56dd8 1267 port = snd_seq_create_port(client, (info->flags & SNDRV_SEQ_PORT_FLG_GIVEN_PORT) ? info->addr.port : -1);
1da177e4
LT		 1268 if (port == NULL)
1269 return -ENOMEM;
1270
04a56dd8 1271 if (client->type == USER_CLIENT && info->kernel) {
1da177e4
LT		 1272 snd_seq_delete_port(client, port->addr.port);
1273 return -EINVAL;
1274 }
1275 if (client->type == KERNEL_CLIENT) {
04a56dd8 1276 if ((callback = info->kernel) != NULL) {
1da177e4
LT		 1277 if (callback->owner)
1278 port->owner = callback->owner;
1279 port->private_data = callback->private_data;
1280 port->private_free = callback->private_free;
1da177e4
LT		 1281 port->event_input = callback->event_input;
1282 port->c_src.open = callback->subscribe;
1283 port->c_src.close = callback->unsubscribe;
1284 port->c_dest.open = callback->use;
1285 port->c_dest.close = callback->unuse;
1286 }
1287 }
1288
04a56dd8 1289 info->addr = port->addr;
1da177e4 1290
04a56dd8 1291 snd_seq_set_port_info(port, info);
1da177e4
LT		 1292 snd_seq_system_client_ev_port_start(port->addr.client, port->addr.port);
1293
1da177e4
LT		 1294 return 0;
1295}
1296
1297/*
1298 * DELETE PORT ioctl()
1299 */
04a56dd8 1300static int snd_seq_ioctl_delete_port(struct snd_seq_client *client, void *arg)
1da177e4 1301{
04a56dd8 1302 struct snd_seq_port_info *info = arg;
1da177e4
LT		 1303 int err;
1304
1da177e4 1305 /* it is not allowed to remove the port for an another client */
04a56dd8 1306 if (info->addr.client != client->number)
1da177e4
LT		 1307 return -EPERM;
1308
04a56dd8 1309 err = snd_seq_delete_port(client, info->addr.port);
1da177e4 1310 if (err >= 0)
04a56dd8 1311 snd_seq_system_client_ev_port_exit(client->number, info->addr.port);
1da177e4
LT		 1312 return err;
1313}
1314
1315
1316/*
1317 * GET_PORT_INFO ioctl() (on any client)
1318 */
04a56dd8 1319static int snd_seq_ioctl_get_port_info(struct snd_seq_client *client, void *arg)
1da177e4 1320{
04a56dd8 1321 struct snd_seq_port_info *info = arg;
c7e0b5bf
TI		 1322 struct snd_seq_client *cptr;
1323 struct snd_seq_client_port *port;
1da177e4 1324
04a56dd8 1325 cptr = snd_seq_client_use_ptr(info->addr.client);
1da177e4
LT		 1326 if (cptr == NULL)
1327 return -ENXIO;
1328
04a56dd8 1329 port = snd_seq_port_use_ptr(cptr, info->addr.port);
1da177e4
LT		 1330 if (port == NULL) {
1331 snd_seq_client_unlock(cptr);
1332 return -ENOENT; /* don't change */
1333 }
1334
1335 /* get port info */
04a56dd8 1336 snd_seq_get_port_info(port, info);
1da177e4
LT		 1337 snd_seq_port_unlock(port);
1338 snd_seq_client_unlock(cptr);
1339
1da177e4
LT		 1340 return 0;
1341}
1342
1343
1344/*
1345 * SET_PORT_INFO ioctl() (only ports on this/own client)
1346 */
04a56dd8 1347static int snd_seq_ioctl_set_port_info(struct snd_seq_client *client, void *arg)
1da177e4 1348{
04a56dd8 1349 struct snd_seq_port_info *info = arg;
c7e0b5bf 1350 struct snd_seq_client_port *port;
1da177e4 1351
04a56dd8 1352 if (info->addr.client != client->number) /* only set our own ports ! */
1da177e4 1353 return -EPERM;
04a56dd8 1354 port = snd_seq_port_use_ptr(client, info->addr.port);
1da177e4 1355 if (port) {
04a56dd8 1356 snd_seq_set_port_info(port, info);
1da177e4
LT		 1357 snd_seq_port_unlock(port);
1358 }
1359 return 0;
1360}
1361
1362
1363/*
1364 * port subscription (connection)
1365 */
1366#define PERM_RD (SNDRV_SEQ_PORT_CAP_READ|SNDRV_SEQ_PORT_CAP_SUBS_READ)
1367#define PERM_WR (SNDRV_SEQ_PORT_CAP_WRITE|SNDRV_SEQ_PORT_CAP_SUBS_WRITE)
1368
c7e0b5bf
TI		 1369static int check_subscription_permission(struct snd_seq_client *client,
1370 struct snd_seq_client_port *sport,
1371 struct snd_seq_client_port *dport,
1372 struct snd_seq_port_subscribe *subs)
1da177e4
LT		 1373{
1374 if (client->number != subs->sender.client &&
1375 client->number != subs->dest.client) {
1376 /* connection by third client - check export permission */
1377 if (check_port_perm(sport, SNDRV_SEQ_PORT_CAP_NO_EXPORT))
1378 return -EPERM;
1379 if (check_port_perm(dport, SNDRV_SEQ_PORT_CAP_NO_EXPORT))
1380 return -EPERM;
1381 }
1382
1383 /* check read permission */
1384 /* if sender or receiver is the subscribing client itself,
1385 * no permission check is necessary
1386 */
1387 if (client->number != subs->sender.client) {
1388 if (! check_port_perm(sport, PERM_RD))
1389 return -EPERM;
1390 }
1391 /* check write permission */
1392 if (client->number != subs->dest.client) {
1393 if (! check_port_perm(dport, PERM_WR))
1394 return -EPERM;
1395 }
1396 return 0;
1397}
1398
1399/*
1400 * send an subscription notify event to user client:
1401 * client must be user client.
1402 */
1403int snd_seq_client_notify_subscription(int client, int port,
c7e0b5bf
TI		 1404 struct snd_seq_port_subscribe *info,
1405 int evtype)
1da177e4 1406{
c7e0b5bf 1407 struct snd_seq_event event;
1da177e4
LT		 1408
1409 memset(&event, 0, sizeof(event));
1410 event.type = evtype;
1411 event.data.connect.dest = info->dest;
1412 event.data.connect.sender = info->sender;
1413
1414 return snd_seq_system_notify(client, port, &event); /* non-atomic */
1415}
1416
1417
1418/*
1419 * add to port's subscription list IOCTL interface
1420 */
c7e0b5bf 1421static int snd_seq_ioctl_subscribe_port(struct snd_seq_client *client,
04a56dd8 1422 void *arg)
1da177e4 1423{
04a56dd8 1424 struct snd_seq_port_subscribe *subs = arg;
1da177e4 1425 int result = -EINVAL;
c7e0b5bf
TI		 1426 struct snd_seq_client *receiver = NULL, *sender = NULL;
1427 struct snd_seq_client_port *sport = NULL, *dport = NULL;
1da177e4 1428
04a56dd8 1429 if ((receiver = snd_seq_client_use_ptr(subs->dest.client)) == NULL)
1da177e4 1430 goto __end;
04a56dd8 1431 if ((sender = snd_seq_client_use_ptr(subs->sender.client)) == NULL)
1da177e4 1432 goto __end;
04a56dd8 1433 if ((sport = snd_seq_port_use_ptr(sender, subs->sender.port)) == NULL)
1da177e4 1434 goto __end;
04a56dd8 1435 if ((dport = snd_seq_port_use_ptr(receiver, subs->dest.port)) == NULL)
1da177e4
LT		 1436 goto __end;
1437
04a56dd8 1438 result = check_subscription_permission(client, sport, dport, subs);
1da177e4
LT		 1439 if (result < 0)
1440 goto __end;
1441
1442 /* connect them */
04a56dd8 1443 result = snd_seq_port_connect(client, sender, sport, receiver, dport, subs);
1da177e4
LT		 1444 if (! result) /* broadcast announce */
1445 snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0,
04a56dd8 1446 subs, SNDRV_SEQ_EVENT_PORT_SUBSCRIBED);
1da177e4
LT		 1447 __end:
1448 if (sport)
1449 snd_seq_port_unlock(sport);
1450 if (dport)
1451 snd_seq_port_unlock(dport);
1452 if (sender)
1453 snd_seq_client_unlock(sender);
1454 if (receiver)
1455 snd_seq_client_unlock(receiver);
1456 return result;
1457}
1458
1459
1460/*
1461 * remove from port's subscription list
1462 */
c7e0b5bf 1463static int snd_seq_ioctl_unsubscribe_port(struct snd_seq_client *client,
04a56dd8 1464 void *arg)
1da177e4 1465{
04a56dd8 1466 struct snd_seq_port_subscribe *subs = arg;
1da177e4 1467 int result = -ENXIO;
c7e0b5bf
TI		 1468 struct snd_seq_client *receiver = NULL, *sender = NULL;
1469 struct snd_seq_client_port *sport = NULL, *dport = NULL;
1da177e4 1470
04a56dd8 1471 if ((receiver = snd_seq_client_use_ptr(subs->dest.client)) == NULL)
1da177e4 1472 goto __end;
04a56dd8 1473 if ((sender = snd_seq_client_use_ptr(subs->sender.client)) == NULL)
1da177e4 1474 goto __end;
04a56dd8 1475 if ((sport = snd_seq_port_use_ptr(sender, subs->sender.port)) == NULL)
1da177e4 1476 goto __end;
04a56dd8 1477 if ((dport = snd_seq_port_use_ptr(receiver, subs->dest.port)) == NULL)
1da177e4
LT		 1478 goto __end;
1479
04a56dd8 1480 result = check_subscription_permission(client, sport, dport, subs);
1da177e4
LT		 1481 if (result < 0)
1482 goto __end;
1483
04a56dd8 1484 result = snd_seq_port_disconnect(client, sender, sport, receiver, dport, subs);
1da177e4
LT		 1485 if (! result) /* broadcast announce */
1486 snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0,
04a56dd8 1487 subs, SNDRV_SEQ_EVENT_PORT_UNSUBSCRIBED);
1da177e4
LT		 1488 __end:
1489 if (sport)
1490 snd_seq_port_unlock(sport);
1491 if (dport)
1492 snd_seq_port_unlock(dport);
1493 if (sender)
1494 snd_seq_client_unlock(sender);
1495 if (receiver)
1496 snd_seq_client_unlock(receiver);
1497 return result;
1498}
1499
1500
1501/* CREATE_QUEUE ioctl() */
04a56dd8 1502static int snd_seq_ioctl_create_queue(struct snd_seq_client *client, void *arg)
1da177e4 1503{
04a56dd8 1504 struct snd_seq_queue_info *info = arg;
c7e0b5bf 1505 struct snd_seq_queue *q;
1da177e4 1506
7e1d90f6
DM		 1507 q = snd_seq_queue_alloc(client->number, info->locked, info->flags);
1508 if (IS_ERR(q))
1509 return PTR_ERR(q);
1da177e4 1510
04a56dd8
TS		 1511 info->queue = q->queue;
1512 info->locked = q->locked;
1513 info->owner = q->owner;
1da177e4
LT		 1514
1515 /* set queue name */
04a56dd8
TS		 1516 if (!info->name[0])
1517 snprintf(info->name, sizeof(info->name), "Queue-%d", q->queue);
1518 strlcpy(q->name, info->name, sizeof(q->name));
7e1d90f6 1519 snd_use_lock_free(&q->use_lock);
1da177e4 1520
1da177e4
LT		 1521 return 0;
1522}
1523
1524/* DELETE_QUEUE ioctl() */
04a56dd8 1525static int snd_seq_ioctl_delete_queue(struct snd_seq_client *client, void *arg)
1da177e4 1526{
04a56dd8 1527 struct snd_seq_queue_info *info = arg;
1da177e4 1528
04a56dd8 1529 return snd_seq_queue_delete(client->number, info->queue);
1da177e4
LT		 1530}
1531
1532/* GET_QUEUE_INFO ioctl() */
c7e0b5bf 1533static int snd_seq_ioctl_get_queue_info(struct snd_seq_client *client,
04a56dd8 1534 void *arg)
1da177e4 1535{
04a56dd8 1536 struct snd_seq_queue_info *info = arg;
c7e0b5bf 1537 struct snd_seq_queue *q;
1da177e4 1538
04a56dd8 1539 q = queueptr(info->queue);
1da177e4
LT		 1540 if (q == NULL)
1541 return -EINVAL;
1542
04a56dd8
TS		 1543 memset(info, 0, sizeof(*info));
1544 info->queue = q->queue;
1545 info->owner = q->owner;
1546 info->locked = q->locked;
1547 strlcpy(info->name, q->name, sizeof(info->name));
1da177e4
LT		 1548 queuefree(q);
1549
1da177e4
LT		 1550 return 0;
1551}
1552
1553/* SET_QUEUE_INFO ioctl() */
c7e0b5bf 1554static int snd_seq_ioctl_set_queue_info(struct snd_seq_client *client,
04a56dd8 1555 void *arg)
1da177e4 1556{
04a56dd8 1557 struct snd_seq_queue_info *info = arg;
c7e0b5bf 1558 struct snd_seq_queue *q;
1da177e4 1559
04a56dd8 1560 if (info->owner != client->number)
1da177e4
LT		 1561 return -EINVAL;
1562
1563 /* change owner/locked permission */
04a56dd8
TS		 1564 if (snd_seq_queue_check_access(info->queue, client->number)) {
1565 if (snd_seq_queue_set_owner(info->queue, client->number, info->locked) < 0)
1da177e4 1566 return -EPERM;
04a56dd8
TS		 1567 if (info->locked)
1568 snd_seq_queue_use(info->queue, client->number, 1);
1da177e4
LT		 1569 } else {
1570 return -EPERM;
1571 }
1572
04a56dd8 1573 q = queueptr(info->queue);
1da177e4
LT		 1574 if (! q)
1575 return -EINVAL;
1576 if (q->owner != client->number) {
1577 queuefree(q);
1578 return -EPERM;
1579 }
04a56dd8 1580 strlcpy(q->name, info->name, sizeof(q->name));
1da177e4
LT		 1581 queuefree(q);
1582
1583 return 0;
1584}
1585
1586/* GET_NAMED_QUEUE ioctl() */
04a56dd8
TS		 1587static int snd_seq_ioctl_get_named_queue(struct snd_seq_client *client,
1588 void *arg)
1da177e4 1589{
04a56dd8 1590 struct snd_seq_queue_info *info = arg;
c7e0b5bf 1591 struct snd_seq_queue *q;
1da177e4 1592
04a56dd8 1593 q = snd_seq_queue_find_name(info->name);
1da177e4
LT		 1594 if (q == NULL)
1595 return -EINVAL;
04a56dd8
TS		 1596 info->queue = q->queue;
1597 info->owner = q->owner;
1598 info->locked = q->locked;
1da177e4
LT		 1599 queuefree(q);
1600
1da177e4
LT		 1601 return 0;
1602}
1603
1604/* GET_QUEUE_STATUS ioctl() */
c7e0b5bf 1605static int snd_seq_ioctl_get_queue_status(struct snd_seq_client *client,
04a56dd8 1606 void *arg)
1da177e4 1607{
04a56dd8 1608 struct snd_seq_queue_status *status = arg;
c7e0b5bf
TI		 1609 struct snd_seq_queue *queue;
1610 struct snd_seq_timer *tmr;
1da177e4 1611
04a56dd8 1612 queue = queueptr(status->queue);
1da177e4
LT		 1613 if (queue == NULL)
1614 return -EINVAL;
04a56dd8
TS		 1615 memset(status, 0, sizeof(*status));
1616 status->queue = queue->queue;
1da177e4
LT		 1617
1618 tmr = queue->timer;
04a56dd8 1619 status->events = queue->tickq->cells + queue->timeq->cells;
1da177e4 1620
04a56dd8
TS		 1621 status->time = snd_seq_timer_get_cur_time(tmr);
1622 status->tick = snd_seq_timer_get_cur_tick(tmr);
1da177e4 1623
04a56dd8 1624 status->running = tmr->running;
1da177e4 1625
04a56dd8 1626 status->flags = queue->flags;
1da177e4
LT		 1627 queuefree(queue);
1628
1da177e4
LT		 1629 return 0;
1630}
1631
1632
1633/* GET_QUEUE_TEMPO ioctl() */
c7e0b5bf 1634static int snd_seq_ioctl_get_queue_tempo(struct snd_seq_client *client,
04a56dd8 1635 void *arg)
1da177e4 1636{
04a56dd8 1637 struct snd_seq_queue_tempo *tempo = arg;
c7e0b5bf
TI		 1638 struct snd_seq_queue *queue;
1639 struct snd_seq_timer *tmr;
1da177e4 1640
04a56dd8 1641 queue = queueptr(tempo->queue);
1da177e4
LT		 1642 if (queue == NULL)
1643 return -EINVAL;
04a56dd8
TS		 1644 memset(tempo, 0, sizeof(*tempo));
1645 tempo->queue = queue->queue;
1da177e4
LT		 1646
1647 tmr = queue->timer;
1648
04a56dd8
TS		 1649 tempo->tempo = tmr->tempo;
1650 tempo->ppq = tmr->ppq;
1651 tempo->skew_value = tmr->skew;
1652 tempo->skew_base = tmr->skew_base;
1da177e4
LT		 1653 queuefree(queue);
1654
1da177e4
LT		 1655 return 0;
1656}
1657
1658
1659/* SET_QUEUE_TEMPO ioctl() */
c7e0b5bf 1660int snd_seq_set_queue_tempo(int client, struct snd_seq_queue_tempo *tempo)
1da177e4
LT		 1661{
1662 if (!snd_seq_queue_check_access(tempo->queue, client))
1663 return -EPERM;
1664 return snd_seq_queue_timer_set_tempo(tempo->queue, client, tempo);
1665}
91715ed9
TI		 1666EXPORT_SYMBOL(snd_seq_set_queue_tempo);
1667
c7e0b5bf 1668static int snd_seq_ioctl_set_queue_tempo(struct snd_seq_client *client,
04a56dd8 1669 void *arg)
1da177e4 1670{
04a56dd8 1671 struct snd_seq_queue_tempo *tempo = arg;
1da177e4 1672 int result;
1da177e4 1673
04a56dd8 1674 result = snd_seq_set_queue_tempo(client->number, tempo);
1da177e4
LT		 1675 return result < 0 ? result : 0;
1676}
1677
1678
1679/* GET_QUEUE_TIMER ioctl() */
c7e0b5bf 1680static int snd_seq_ioctl_get_queue_timer(struct snd_seq_client *client,
04a56dd8 1681 void *arg)
1da177e4 1682{
04a56dd8 1683 struct snd_seq_queue_timer *timer = arg;
c7e0b5bf
TI		 1684 struct snd_seq_queue *queue;
1685 struct snd_seq_timer *tmr;
1da177e4 1686
04a56dd8 1687 queue = queueptr(timer->queue);
1da177e4
LT		 1688 if (queue == NULL)
1689 return -EINVAL;
1690
1a60d4c5 1691 if (mutex_lock_interruptible(&queue->timer_mutex)) {
1da177e4
LT		 1692 queuefree(queue);
1693 return -ERESTARTSYS;
1694 }
1695 tmr = queue->timer;
04a56dd8
TS		 1696 memset(timer, 0, sizeof(*timer));
1697 timer->queue = queue->queue;
1da177e4 1698
04a56dd8 1699 timer->type = tmr->type;
1da177e4 1700 if (tmr->type == SNDRV_SEQ_TIMER_ALSA) {
04a56dd8
TS		 1701 timer->u.alsa.id = tmr->alsa_id;
1702 timer->u.alsa.resolution = tmr->preferred_resolution;
1da177e4 1703 }
1a60d4c5 1704 mutex_unlock(&queue->timer_mutex);
1da177e4
LT		 1705 queuefree(queue);
1706
1da177e4
LT		 1707 return 0;
1708}
1709
1710
1711/* SET_QUEUE_TIMER ioctl() */
c7e0b5bf 1712static int snd_seq_ioctl_set_queue_timer(struct snd_seq_client *client,
04a56dd8 1713 void *arg)
1da177e4 1714{
04a56dd8 1715 struct snd_seq_queue_timer *timer = arg;
1da177e4 1716 int result = 0;
1da177e4 1717
04a56dd8 1718 if (timer->type != SNDRV_SEQ_TIMER_ALSA)
1da177e4
LT		 1719 return -EINVAL;
1720
04a56dd8 1721 if (snd_seq_queue_check_access(timer->queue, client->number)) {
c7e0b5bf
TI		 1722 struct snd_seq_queue *q;
1723 struct snd_seq_timer *tmr;
1da177e4 1724
04a56dd8 1725 q = queueptr(timer->queue);
1da177e4
LT		 1726 if (q == NULL)
1727 return -ENXIO;
1a60d4c5 1728 if (mutex_lock_interruptible(&q->timer_mutex)) {
1da177e4
LT		 1729 queuefree(q);
1730 return -ERESTARTSYS;
1731 }
1732 tmr = q->timer;
04a56dd8
TS		 1733 snd_seq_queue_timer_close(timer->queue);
1734 tmr->type = timer->type;
1da177e4 1735 if (tmr->type == SNDRV_SEQ_TIMER_ALSA) {
04a56dd8
TS		 1736 tmr->alsa_id = timer->u.alsa.id;
1737 tmr->preferred_resolution = timer->u.alsa.resolution;
1da177e4 1738 }
04a56dd8 1739 result = snd_seq_queue_timer_open(timer->queue);
1a60d4c5 1740 mutex_unlock(&q->timer_mutex);
1da177e4
LT		 1741 queuefree(q);
1742 } else {
1743 return -EPERM;
1744 }
1745
1746 return result;
1747}
1748
1749
1750/* GET_QUEUE_CLIENT ioctl() */
c7e0b5bf 1751static int snd_seq_ioctl_get_queue_client(struct snd_seq_client *client,
04a56dd8 1752 void *arg)
1da177e4 1753{
04a56dd8 1754 struct snd_seq_queue_client *info = arg;
1da177e4
LT		 1755 int used;
1756
04a56dd8 1757 used = snd_seq_queue_is_used(info->queue, client->number);
1da177e4
LT		 1758 if (used < 0)
1759 return -EINVAL;
04a56dd8
TS		 1760 info->used = used;
1761 info->client = client->number;
1da177e4 1762
1da177e4
LT		 1763 return 0;
1764}
1765
1766
1767/* SET_QUEUE_CLIENT ioctl() */
c7e0b5bf 1768static int snd_seq_ioctl_set_queue_client(struct snd_seq_client *client,
04a56dd8 1769 void *arg)
1da177e4 1770{
04a56dd8 1771 struct snd_seq_queue_client *info = arg;
1da177e4 1772 int err;
1da177e4 1773
04a56dd8
TS		 1774 if (info->used >= 0) {
1775 err = snd_seq_queue_use(info->queue, client->number, info->used);
1da177e4
LT		 1776 if (err < 0)
1777 return err;
1778 }
1779
1780 return snd_seq_ioctl_get_queue_client(client, arg);
1781}
1782
1783
1784/* GET_CLIENT_POOL ioctl() */
c7e0b5bf 1785static int snd_seq_ioctl_get_client_pool(struct snd_seq_client *client,
04a56dd8 1786 void *arg)
1da177e4 1787{
04a56dd8 1788 struct snd_seq_client_pool *info = arg;
c7e0b5bf 1789 struct snd_seq_client *cptr;
1da177e4 1790
04a56dd8 1791 cptr = snd_seq_client_use_ptr(info->client);
1da177e4
LT		 1792 if (cptr == NULL)
1793 return -ENOENT;
04a56dd8
TS		 1794 memset(info, 0, sizeof(*info));
1795 info->client = cptr->number;
1796 info->output_pool = cptr->pool->size;
1797 info->output_room = cptr->pool->room;
1798 info->output_free = info->output_pool;
1799 info->output_free = snd_seq_unused_cells(cptr->pool);
1da177e4 1800 if (cptr->type == USER_CLIENT) {
04a56dd8
TS		 1801 info->input_pool = cptr->data.user.fifo_pool_size;
1802 info->input_free = info->input_pool;
1da177e4 1803 if (cptr->data.user.fifo)
04a56dd8 1804 info->input_free = snd_seq_unused_cells(cptr->data.user.fifo->pool);
1da177e4 1805 } else {
04a56dd8
TS		 1806 info->input_pool = 0;
1807 info->input_free = 0;
1da177e4
LT		 1808 }
1809 snd_seq_client_unlock(cptr);
1810
1da177e4
LT		 1811 return 0;
1812}
1813
1814/* SET_CLIENT_POOL ioctl() */
c7e0b5bf 1815static int snd_seq_ioctl_set_client_pool(struct snd_seq_client *client,
04a56dd8 1816 void *arg)
1da177e4 1817{
04a56dd8 1818 struct snd_seq_client_pool *info = arg;
1da177e4
LT		 1819 int rc;
1820
04a56dd8 1821 if (client->number != info->client)
1da177e4
LT		 1822 return -EINVAL; /* can't change other clients */
1823
04a56dd8 1824 if (info->output_pool >= 1 && info->output_pool <= SNDRV_SEQ_MAX_EVENTS &&
1da177e4 1825 (! snd_seq_write_pool_allocated(client) ||
04a56dd8 1826 info->output_pool != client->pool->size)) {
1da177e4
LT		 1827 if (snd_seq_write_pool_allocated(client)) {
1828 /* remove all existing cells */
c520ff3d 1829 snd_seq_pool_mark_closing(client->pool);
1da177e4
LT		 1830 snd_seq_queue_client_leave_cells(client->number);
1831 snd_seq_pool_done(client->pool);
1832 }
04a56dd8 1833 client->pool->size = info->output_pool;
1da177e4
LT		 1834 rc = snd_seq_pool_init(client->pool);
1835 if (rc < 0)
1836 return rc;
1837 }
1838 if (client->type == USER_CLIENT && client->data.user.fifo != NULL &&
04a56dd8
TS		 1839 info->input_pool >= 1 &&
1840 info->input_pool <= SNDRV_SEQ_MAX_CLIENT_EVENTS &&
1841 info->input_pool != client->data.user.fifo_pool_size) {
1da177e4 1842 /* change pool size */
04a56dd8 1843 rc = snd_seq_fifo_resize(client->data.user.fifo, info->input_pool);
1da177e4
LT		 1844 if (rc < 0)
1845 return rc;
04a56dd8 1846 client->data.user.fifo_pool_size = info->input_pool;
1da177e4 1847 }
04a56dd8
TS		 1848 if (info->output_room >= 1 &&
1849 info->output_room <= client->pool->size) {
1850 client->pool->room = info->output_room;
1da177e4
LT		 1851 }
1852
1853 return snd_seq_ioctl_get_client_pool(client, arg);
1854}
1855
1856
1857/* REMOVE_EVENTS ioctl() */
c7e0b5bf 1858static int snd_seq_ioctl_remove_events(struct snd_seq_client *client,
04a56dd8 1859 void *arg)
1da177e4 1860{
04a56dd8 1861 struct snd_seq_remove_events *info = arg;
1da177e4
LT		 1862
1863 /*
1864 * Input mostly not implemented XXX.
1865 */
04a56dd8 1866 if (info->remove_mode & SNDRV_SEQ_REMOVE_INPUT) {
1da177e4
LT		 1867 /*
1868 * No restrictions so for a user client we can clear
1869 * the whole fifo
1870 */
030e2c78 1871 if (client->type == USER_CLIENT && client->data.user.fifo)
1da177e4
LT		 1872 snd_seq_fifo_clear(client->data.user.fifo);
1873 }
1874
04a56dd8
TS		 1875 if (info->remove_mode & SNDRV_SEQ_REMOVE_OUTPUT)
1876 snd_seq_queue_remove_cells(client->number, info);
1da177e4
LT		 1877
1878 return 0;
1879}
1880
1881
1882/*
1883 * get subscription info
1884 */
c7e0b5bf 1885static int snd_seq_ioctl_get_subscription(struct snd_seq_client *client,
04a56dd8 1886 void *arg)
1da177e4 1887{
04a56dd8 1888 struct snd_seq_port_subscribe *subs = arg;
1da177e4 1889 int result;
c7e0b5bf
TI		 1890 struct snd_seq_client *sender = NULL;
1891 struct snd_seq_client_port *sport = NULL;
c7e0b5bf 1892 struct snd_seq_subscribers *p;
1da177e4 1893
1da177e4 1894 result = -EINVAL;
04a56dd8 1895 if ((sender = snd_seq_client_use_ptr(subs->sender.client)) == NULL)
1da177e4 1896 goto __end;
04a56dd8 1897 if ((sport = snd_seq_port_use_ptr(sender, subs->sender.port)) == NULL)
1da177e4 1898 goto __end;
04a56dd8 1899 p = snd_seq_port_get_subscription(&sport->c_src, &subs->dest);
1da177e4
LT		 1900 if (p) {
1901 result = 0;
04a56dd8 1902 *subs = p->info;
1da177e4
LT		 1903 } else
1904 result = -ENOENT;
1905
1906 __end:
1907 if (sport)
1908 snd_seq_port_unlock(sport);
1909 if (sender)
1910 snd_seq_client_unlock(sender);
04a56dd8 1911
1da177e4
LT		 1912 return result;
1913}
1914
1915
1916/*
1917 * get subscription info - check only its presence
1918 */
04a56dd8 1919static int snd_seq_ioctl_query_subs(struct snd_seq_client *client, void *arg)
1da177e4 1920{
04a56dd8 1921 struct snd_seq_query_subs *subs = arg;
1da177e4 1922 int result = -ENXIO;
c7e0b5bf
TI		 1923 struct snd_seq_client *cptr = NULL;
1924 struct snd_seq_client_port *port = NULL;
c7e0b5bf 1925 struct snd_seq_port_subs_info *group;
1da177e4
LT		 1926 struct list_head *p;
1927 int i;
1928
04a56dd8 1929 if ((cptr = snd_seq_client_use_ptr(subs->root.client)) == NULL)
1da177e4 1930 goto __end;
04a56dd8 1931 if ((port = snd_seq_port_use_ptr(cptr, subs->root.port)) == NULL)
1da177e4
LT		 1932 goto __end;
1933
04a56dd8 1934 switch (subs->type) {
1da177e4
LT		 1935 case SNDRV_SEQ_QUERY_SUBS_READ:
1936 group = &port->c_src;
1937 break;
1938 case SNDRV_SEQ_QUERY_SUBS_WRITE:
1939 group = &port->c_dest;
1940 break;
1941 default:
1942 goto __end;
1943 }
1944
1945 down_read(&group->list_mutex);
1946 /* search for the subscriber */
04a56dd8 1947 subs->num_subs = group->count;
1da177e4
LT		 1948 i = 0;
1949 result = -ENOENT;
1950 list_for_each(p, &group->list_head) {
04a56dd8 1951 if (i++ == subs->index) {
1da177e4 1952 /* found! */
c7e0b5bf 1953 struct snd_seq_subscribers *s;
04a56dd8 1954 if (subs->type == SNDRV_SEQ_QUERY_SUBS_READ) {
c7e0b5bf 1955 s = list_entry(p, struct snd_seq_subscribers, src_list);
04a56dd8 1956 subs->addr = s->info.dest;
1da177e4 1957 } else {
c7e0b5bf 1958 s = list_entry(p, struct snd_seq_subscribers, dest_list);
04a56dd8 1959 subs->addr = s->info.sender;
1da177e4 1960 }
04a56dd8
TS		 1961 subs->flags = s->info.flags;
1962 subs->queue = s->info.queue;
1da177e4
LT		 1963 result = 0;
1964 break;
1965 }
1966 }
1967 up_read(&group->list_mutex);
1968
1969 __end:
1970 if (port)
1971 snd_seq_port_unlock(port);
1972 if (cptr)
1973 snd_seq_client_unlock(cptr);
04a56dd8 1974
1da177e4
LT		 1975 return result;
1976}
1977
1978
1979/*
1980 * query next client
1981 */
c7e0b5bf 1982static int snd_seq_ioctl_query_next_client(struct snd_seq_client *client,
04a56dd8 1983 void *arg)
1da177e4 1984{
04a56dd8 1985 struct snd_seq_client_info *info = arg;
c7e0b5bf 1986 struct snd_seq_client *cptr = NULL;
1da177e4
LT		 1987
1988 /* search for next client */
04a56dd8
TS		 1989 info->client++;
1990 if (info->client < 0)
1991 info->client = 0;
1992 for (; info->client < SNDRV_SEQ_MAX_CLIENTS; info->client++) {
1993 cptr = snd_seq_client_use_ptr(info->client);
1da177e4
LT		 1994 if (cptr)
1995 break; /* found */
1996 }
1997 if (cptr == NULL)
1998 return -ENOENT;
1999
04a56dd8 2000 get_client_info(cptr, info);
1da177e4
LT		 2001 snd_seq_client_unlock(cptr);
2002
1da177e4
LT		 2003 return 0;
2004}
2005
2006/*
2007 * query next port
2008 */
c7e0b5bf 2009static int snd_seq_ioctl_query_next_port(struct snd_seq_client *client,
04a56dd8 2010 void *arg)
1da177e4 2011{
04a56dd8 2012 struct snd_seq_port_info *info = arg;
c7e0b5bf
TI		 2013 struct snd_seq_client *cptr;
2014 struct snd_seq_client_port *port = NULL;
1da177e4 2015
04a56dd8 2016 cptr = snd_seq_client_use_ptr(info->addr.client);
1da177e4
LT		 2017 if (cptr == NULL)
2018 return -ENXIO;
2019
2020 /* search for next port */
04a56dd8
TS		 2021 info->addr.port++;
2022 port = snd_seq_port_query_nearest(cptr, info);
1da177e4
LT		 2023 if (port == NULL) {
2024 snd_seq_client_unlock(cptr);
2025 return -ENOENT;
2026 }
2027
2028 /* get port info */
04a56dd8
TS		 2029 info->addr = port->addr;
2030 snd_seq_get_port_info(port, info);
1da177e4
LT		 2031 snd_seq_port_unlock(port);
2032 snd_seq_client_unlock(cptr);
2033
1da177e4
LT		 2034 return 0;
2035}
2036
2037/* -------------------------------------------------------- */
2038
8ce8eb60
TS		 2039static const struct ioctl_handler {
2040 unsigned int cmd;
2041 int (*func)(struct snd_seq_client *client, void *arg);
2042} ioctl_handlers[] = {
04a56dd8
TS		 2043 { SNDRV_SEQ_IOCTL_PVERSION, snd_seq_ioctl_pversion },
2044 { SNDRV_SEQ_IOCTL_CLIENT_ID, snd_seq_ioctl_client_id },
1da177e4
LT		 2045 { SNDRV_SEQ_IOCTL_SYSTEM_INFO, snd_seq_ioctl_system_info },
2046 { SNDRV_SEQ_IOCTL_RUNNING_MODE, snd_seq_ioctl_running_mode },
2047 { SNDRV_SEQ_IOCTL_GET_CLIENT_INFO, snd_seq_ioctl_get_client_info },
2048 { SNDRV_SEQ_IOCTL_SET_CLIENT_INFO, snd_seq_ioctl_set_client_info },
2049 { SNDRV_SEQ_IOCTL_CREATE_PORT, snd_seq_ioctl_create_port },
2050 { SNDRV_SEQ_IOCTL_DELETE_PORT, snd_seq_ioctl_delete_port },
2051 { SNDRV_SEQ_IOCTL_GET_PORT_INFO, snd_seq_ioctl_get_port_info },
2052 { SNDRV_SEQ_IOCTL_SET_PORT_INFO, snd_seq_ioctl_set_port_info },
2053 { SNDRV_SEQ_IOCTL_SUBSCRIBE_PORT, snd_seq_ioctl_subscribe_port },
2054 { SNDRV_SEQ_IOCTL_UNSUBSCRIBE_PORT, snd_seq_ioctl_unsubscribe_port },
2055 { SNDRV_SEQ_IOCTL_CREATE_QUEUE, snd_seq_ioctl_create_queue },
2056 { SNDRV_SEQ_IOCTL_DELETE_QUEUE, snd_seq_ioctl_delete_queue },
2057 { SNDRV_SEQ_IOCTL_GET_QUEUE_INFO, snd_seq_ioctl_get_queue_info },
2058 { SNDRV_SEQ_IOCTL_SET_QUEUE_INFO, snd_seq_ioctl_set_queue_info },
2059 { SNDRV_SEQ_IOCTL_GET_NAMED_QUEUE, snd_seq_ioctl_get_named_queue },
2060 { SNDRV_SEQ_IOCTL_GET_QUEUE_STATUS, snd_seq_ioctl_get_queue_status },
2061 { SNDRV_SEQ_IOCTL_GET_QUEUE_TEMPO, snd_seq_ioctl_get_queue_tempo },
2062 { SNDRV_SEQ_IOCTL_SET_QUEUE_TEMPO, snd_seq_ioctl_set_queue_tempo },
2063 { SNDRV_SEQ_IOCTL_GET_QUEUE_TIMER, snd_seq_ioctl_get_queue_timer },
2064 { SNDRV_SEQ_IOCTL_SET_QUEUE_TIMER, snd_seq_ioctl_set_queue_timer },
2065 { SNDRV_SEQ_IOCTL_GET_QUEUE_CLIENT, snd_seq_ioctl_get_queue_client },
2066 { SNDRV_SEQ_IOCTL_SET_QUEUE_CLIENT, snd_seq_ioctl_set_queue_client },
2067 { SNDRV_SEQ_IOCTL_GET_CLIENT_POOL, snd_seq_ioctl_get_client_pool },
2068 { SNDRV_SEQ_IOCTL_SET_CLIENT_POOL, snd_seq_ioctl_set_client_pool },
2069 { SNDRV_SEQ_IOCTL_GET_SUBSCRIPTION, snd_seq_ioctl_get_subscription },
2070 { SNDRV_SEQ_IOCTL_QUERY_NEXT_CLIENT, snd_seq_ioctl_query_next_client },
2071 { SNDRV_SEQ_IOCTL_QUERY_NEXT_PORT, snd_seq_ioctl_query_next_port },
2072 { SNDRV_SEQ_IOCTL_REMOVE_EVENTS, snd_seq_ioctl_remove_events },
2073 { SNDRV_SEQ_IOCTL_QUERY_SUBS, snd_seq_ioctl_query_subs },
2074 { 0, NULL },
2075};
2076
e12ec251
TS		 2077static long snd_seq_ioctl(struct file *file, unsigned int cmd,
2078 unsigned long arg)
8ce8eb60
TS		 2079{
2080 struct snd_seq_client *client = file->private_data;
2081 /* To use kernel stack for ioctl data. */
4127e80a 2082 union {
8ce8eb60
TS		 2083 int pversion;
2084 int client_id;
2085 struct snd_seq_system_info system_info;
2086 struct snd_seq_running_info running_info;
2087 struct snd_seq_client_info client_info;
2088 struct snd_seq_port_info port_info;
2089 struct snd_seq_port_subscribe port_subscribe;
2090 struct snd_seq_queue_info queue_info;
2091 struct snd_seq_queue_status queue_status;
2092 struct snd_seq_queue_tempo tempo;
2093 struct snd_seq_queue_timer queue_timer;
2094 struct snd_seq_queue_client queue_client;
2095 struct snd_seq_client_pool client_pool;
2096 struct snd_seq_remove_events remove_events;
2097 struct snd_seq_query_subs query_subs;
4127e80a 2098 } buf;
8ce8eb60
TS		 2099 const struct ioctl_handler *handler;
2100 unsigned long size;
2101 int err;
2102
2103 if (snd_BUG_ON(!client))
2104 return -ENXIO;
2105
2106 for (handler = ioctl_handlers; handler->cmd > 0; ++handler) {
2107 if (handler->cmd == cmd)
2108 break;
2109 }
2110 if (handler->cmd == 0)
2111 return -ENOTTY;
4127e80a
TS		 2112
2113 memset(&buf, 0, sizeof(buf));
2114
8ce8eb60
TS		 2115 /*
2116 * All of ioctl commands for ALSA sequencer get an argument of size
2117 * within 13 bits. We can safely pick up the size from the command.
2118 */
2119 size = _IOC_SIZE(handler->cmd);
69b05825 2120 if (handler->cmd & IOC_IN) {
8ce8eb60
TS		 2121 if (copy_from_user(&buf, (const void __user *)arg, size))
2122 return -EFAULT;
2123 }
2124
2125 err = handler->func(client, &buf);
2126 if (err >= 0) {
2127 /* Some commands includes a bug in 'dir' field. */
2128 if (handler->cmd == SNDRV_SEQ_IOCTL_SET_QUEUE_CLIENT ||
2129 handler->cmd == SNDRV_SEQ_IOCTL_SET_CLIENT_POOL ||
69b05825 2130 (handler->cmd & IOC_OUT))
8ce8eb60
TS		 2131 if (copy_to_user((void __user *)arg, &buf, size))
2132 return -EFAULT;
2133 }
2134
2135 return err;
2136}
2137
1da177e4
LT		 2138#ifdef CONFIG_COMPAT
2139#include "seq_compat.c"
2140#else
2141#define snd_seq_ioctl_compat NULL
2142#endif
2143
2144/* -------------------------------------------------------- */
2145
2146
2147/* exported to kernel modules */
7b6d9245
CL		 2148int snd_seq_create_kernel_client(struct snd_card *card, int client_index,
2149 const char *name_fmt, ...)
1da177e4 2150{
c7e0b5bf 2151 struct snd_seq_client *client;
7b6d9245 2152 va_list args;
1da177e4 2153
7eaa943c
TI		 2154 if (snd_BUG_ON(in_interrupt()))
2155 return -EBUSY;
1da177e4 2156
aa1e77e6 2157 if (card && client_index >= SNDRV_SEQ_CLIENTS_PER_CARD)
1da177e4 2158 return -EINVAL;
aa1e77e6 2159 if (card == NULL && client_index >= SNDRV_SEQ_GLOBAL_CLIENTS)
1da177e4 2160 return -EINVAL;
1da177e4 2161
1a60d4c5 2162 if (mutex_lock_interruptible(&register_mutex))
1da177e4 2163 return -ERESTARTSYS;
d001544d
CL		 2164
2165 if (card) {
aa1e77e6
CL		 2166 client_index += SNDRV_SEQ_GLOBAL_CLIENTS
2167 + card->number * SNDRV_SEQ_CLIENTS_PER_CARD;
2168 if (client_index >= SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN)
d001544d
CL		 2169 client_index = -1;
2170 }
2171
1da177e4 2172 /* empty write queue as default */
aa1e77e6 2173 client = seq_create_client1(client_index, 0);
1da177e4 2174 if (client == NULL) {
1a60d4c5 2175 mutex_unlock(&register_mutex);
1da177e4
LT		 2176 return -EBUSY; /* failure code */
2177 }
2178 usage_alloc(&client_usage, 1);
2179
83e8ad69
CL		 2180 client->accept_input = 1;
2181 client->accept_output = 1;
a1ce94d0 2182 client->data.kernel.card = card;
1da177e4 2183
7b6d9245
CL		 2184 va_start(args, name_fmt);
2185 vsnprintf(client->name, sizeof(client->name), name_fmt, args);
2186 va_end(args);
1da177e4
LT		 2187
2188 client->type = KERNEL_CLIENT;
1a60d4c5 2189 mutex_unlock(&register_mutex);
1da177e4
LT		 2190
2191 /* make others aware this new client */
2192 snd_seq_system_client_ev_client_start(client->number);
2193
2194 /* return client number to caller */
2195 return client->number;
2196}
91715ed9
TI		 2197EXPORT_SYMBOL(snd_seq_create_kernel_client);
2198
1da177e4
LT		 2199/* exported to kernel modules */
2200int snd_seq_delete_kernel_client(int client)
2201{
c7e0b5bf 2202 struct snd_seq_client *ptr;
1da177e4 2203
7eaa943c
TI		 2204 if (snd_BUG_ON(in_interrupt()))
2205 return -EBUSY;
1da177e4
LT		 2206
2207 ptr = clientptr(client);
2208 if (ptr == NULL)
2209 return -EINVAL;
2210
2211 seq_free_client(ptr);
2212 kfree(ptr);
2213 return 0;
2214}
91715ed9 2215EXPORT_SYMBOL(snd_seq_delete_kernel_client);
1da177e4
LT		 2216
2217/* skeleton to enqueue event, called from snd_seq_kernel_client_enqueue
2218 * and snd_seq_kernel_client_enqueue_blocking
2219 */
c7e0b5bf 2220static int kernel_client_enqueue(int client, struct snd_seq_event *ev,
1da177e4
LT		 2221 struct file *file, int blocking,
2222 int atomic, int hop)
2223{
c7e0b5bf 2224 struct snd_seq_client *cptr;
1da177e4
LT		 2225 int result;
2226
7eaa943c
TI		 2227 if (snd_BUG_ON(!ev))
2228 return -EINVAL;
1da177e4
LT		 2229
2230 if (ev->type == SNDRV_SEQ_EVENT_NONE)
2231 return 0; /* ignore this */
2232 if (ev->type == SNDRV_SEQ_EVENT_KERNEL_ERROR)
2233 return -EINVAL; /* quoted events can't be enqueued */
2234
2235 /* fill in client number */
2236 ev->source.client = client;
2237
2238 if (check_event_type_and_length(ev))
2239 return -EINVAL;
2240
2241 cptr = snd_seq_client_use_ptr(client);
2242 if (cptr == NULL)
2243 return -EINVAL;
2244
2245 if (! cptr->accept_output)
2246 result = -EPERM;
2247 else /* send it */
2248 result = snd_seq_client_enqueue_event(cptr, ev, file, blocking, atomic, hop);
2249
2250 snd_seq_client_unlock(cptr);
2251 return result;
2252}
2253
2254/*
2255 * exported, called by kernel clients to enqueue events (w/o blocking)
2256 *
2257 * RETURN VALUE: zero if succeed, negative if error
2258 */
c7e0b5bf 2259int snd_seq_kernel_client_enqueue(int client, struct snd_seq_event * ev,
1da177e4
LT		 2260 int atomic, int hop)
2261{
2262 return kernel_client_enqueue(client, ev, NULL, 0, atomic, hop);
2263}
91715ed9
TI		 2264EXPORT_SYMBOL(snd_seq_kernel_client_enqueue);
2265
1da177e4
LT		 2266/*
2267 * exported, called by kernel clients to enqueue events (with blocking)
2268 *
2269 * RETURN VALUE: zero if succeed, negative if error
2270 */
c7e0b5bf 2271int snd_seq_kernel_client_enqueue_blocking(int client, struct snd_seq_event * ev,
1da177e4
LT		 2272 struct file *file,
2273 int atomic, int hop)
2274{
2275 return kernel_client_enqueue(client, ev, file, 1, atomic, hop);
2276}
91715ed9 2277EXPORT_SYMBOL(snd_seq_kernel_client_enqueue_blocking);
1da177e4
LT		 2278
2279/*
2280 * exported, called by kernel clients to dispatch events directly to other
2281 * clients, bypassing the queues. Event time-stamp will be updated.
2282 *
2283 * RETURN VALUE: negative = delivery failed,
2284 * zero, or positive: the number of delivered events
2285 */
c7e0b5bf 2286int snd_seq_kernel_client_dispatch(int client, struct snd_seq_event * ev,
1da177e4
LT		 2287 int atomic, int hop)
2288{
c7e0b5bf 2289 struct snd_seq_client *cptr;
1da177e4
LT		 2290 int result;
2291
7eaa943c
TI		 2292 if (snd_BUG_ON(!ev))
2293 return -EINVAL;
1da177e4
LT		 2294
2295 /* fill in client number */
2296 ev->queue = SNDRV_SEQ_QUEUE_DIRECT;
2297 ev->source.client = client;
2298
2299 if (check_event_type_and_length(ev))
2300 return -EINVAL;
2301
2302 cptr = snd_seq_client_use_ptr(client);
2303 if (cptr == NULL)
2304 return -EINVAL;
2305
2306 if (!cptr->accept_output)
2307 result = -EPERM;
2308 else
2309 result = snd_seq_deliver_event(cptr, ev, atomic, hop);
2310
2311 snd_seq_client_unlock(cptr);
2312 return result;
2313}
91715ed9 2314EXPORT_SYMBOL(snd_seq_kernel_client_dispatch);
1da177e4 2315
77dfa8d3
TS		 2316/**
2317 * snd_seq_kernel_client_ctl - operate a command for a client with data in
2318 * kernel space.
2319 * @clientid: A numerical ID for a client.
2320 * @cmd: An ioctl(2) command for ALSA sequencer operation.
2321 * @arg: A pointer to data in kernel space.
2322 *
2323 * Against its name, both kernel/application client can be handled by this
2324 * kernel API. A pointer of 'arg' argument should be in kernel space.
2325 *
2326 * Return: 0 at success. Negative error code at failure.
1da177e4
LT		 2327 */
2328int snd_seq_kernel_client_ctl(int clientid, unsigned int cmd, void *arg)
2329{
8ce8eb60 2330 const struct ioctl_handler *handler;
c7e0b5bf 2331 struct snd_seq_client *client;
1da177e4
LT		 2332
2333 client = clientptr(clientid);
2334 if (client == NULL)
2335 return -ENXIO;
8ce8eb60
TS		 2336
2337 for (handler = ioctl_handlers; handler->cmd > 0; ++handler) {
2338 if (handler->cmd == cmd)
2339 return handler->func(client, arg);
2340 }
2341
e12ec251
TS		 2342 pr_debug("ALSA: seq unknown ioctl() 0x%x (type='%c', number=0x%02x)\n",
2343 cmd, _IOC_TYPE(cmd), _IOC_NR(cmd));
2344 return -ENOTTY;
1da177e4 2345}
91715ed9 2346EXPORT_SYMBOL(snd_seq_kernel_client_ctl);
1da177e4
LT		 2347
2348/* exported (for OSS emulator) */
2349int snd_seq_kernel_client_write_poll(int clientid, struct file *file, poll_table *wait)
2350{
c7e0b5bf 2351 struct snd_seq_client *client;
1da177e4
LT		 2352
2353 client = clientptr(clientid);
2354 if (client == NULL)
2355 return -ENXIO;
2356
2357 if (! snd_seq_write_pool_allocated(client))
2358 return 1;
2359 if (snd_seq_pool_poll_wait(client->pool, file, wait))
2360 return 1;
2361 return 0;
2362}
91715ed9
TI		 2363EXPORT_SYMBOL(snd_seq_kernel_client_write_poll);
2364
1da177e4
LT		 2365/*---------------------------------------------------------------------------*/
2366
cd6a6503 2367#ifdef CONFIG_SND_PROC_FS
1da177e4
LT		 2368/*
2369 * /proc interface
2370 */
c7e0b5bf
TI		 2371static void snd_seq_info_dump_subscribers(struct snd_info_buffer *buffer,
2372 struct snd_seq_port_subs_info *group,
2373 int is_src, char *msg)
1da177e4
LT		 2374{
2375 struct list_head *p;
c7e0b5bf 2376 struct snd_seq_subscribers *s;
1da177e4
LT		 2377 int count = 0;
2378
2379 down_read(&group->list_mutex);
2380 if (list_empty(&group->list_head)) {
2381 up_read(&group->list_mutex);
2382 return;
2383 }
2384 snd_iprintf(buffer, msg);
2385 list_for_each(p, &group->list_head) {
2386 if (is_src)
c7e0b5bf 2387 s = list_entry(p, struct snd_seq_subscribers, src_list);
1da177e4 2388 else
c7e0b5bf 2389 s = list_entry(p, struct snd_seq_subscribers, dest_list);
1da177e4
LT		 2390 if (count++)
2391 snd_iprintf(buffer, ", ");
2392 snd_iprintf(buffer, "%d:%d",
2393 is_src ? s->info.dest.client : s->info.sender.client,
2394 is_src ? s->info.dest.port : s->info.sender.port);
2395 if (s->info.flags & SNDRV_SEQ_PORT_SUBS_TIMESTAMP)
2396 snd_iprintf(buffer, "[%c:%d]", ((s->info.flags & SNDRV_SEQ_PORT_SUBS_TIME_REAL) ? 'r' : 't'), s->info.queue);
2397 if (group->exclusive)
2398 snd_iprintf(buffer, "[ex]");
2399 }
2400 up_read(&group->list_mutex);
2401 snd_iprintf(buffer, "\n");
2402}
2403
2404#define FLAG_PERM_RD(perm) ((perm) & SNDRV_SEQ_PORT_CAP_READ ? ((perm) & SNDRV_SEQ_PORT_CAP_SUBS_READ ? 'R' : 'r') : '-')
2405#define FLAG_PERM_WR(perm) ((perm) & SNDRV_SEQ_PORT_CAP_WRITE ? ((perm) & SNDRV_SEQ_PORT_CAP_SUBS_WRITE ? 'W' : 'w') : '-')
2406#define FLAG_PERM_EX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_NO_EXPORT ? '-' : 'e')
2407
2408#define FLAG_PERM_DUPLEX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_DUPLEX ? 'X' : '-')
2409
c7e0b5bf
TI		 2410static void snd_seq_info_dump_ports(struct snd_info_buffer *buffer,
2411 struct snd_seq_client *client)
1da177e4 2412{
9244b2c3 2413 struct snd_seq_client_port *p;
1da177e4 2414
1a60d4c5 2415 mutex_lock(&client->ports_mutex);
9244b2c3 2416 list_for_each_entry(p, &client->ports_list_head, list) {
1da177e4
LT		 2417 snd_iprintf(buffer, " Port %3d : \"%s\" (%c%c%c%c)\n",
2418 p->addr.port, p->name,
2419 FLAG_PERM_RD(p->capability),
2420 FLAG_PERM_WR(p->capability),
2421 FLAG_PERM_EX(p->capability),
2422 FLAG_PERM_DUPLEX(p->capability));
2423 snd_seq_info_dump_subscribers(buffer, &p->c_src, 1, " Connecting To: ");
2424 snd_seq_info_dump_subscribers(buffer, &p->c_dest, 0, " Connected From: ");
2425 }
1a60d4c5 2426 mutex_unlock(&client->ports_mutex);
1da177e4
LT		 2427}
2428
2429
2430/* exported to seq_info.c */
c7e0b5bf
TI		 2431void snd_seq_info_clients_read(struct snd_info_entry *entry,
2432 struct snd_info_buffer *buffer)
1da177e4 2433{
1da177e4 2434 int c;
c7e0b5bf 2435 struct snd_seq_client *client;
1da177e4
LT		 2436
2437 snd_iprintf(buffer, "Client info\n");
2438 snd_iprintf(buffer, " cur clients : %d\n", client_usage.cur);
2439 snd_iprintf(buffer, " peak clients : %d\n", client_usage.peak);
2440 snd_iprintf(buffer, " max clients : %d\n", SNDRV_SEQ_MAX_CLIENTS);
2441 snd_iprintf(buffer, "\n");
2442
2443 /* list the client table */
2444 for (c = 0; c < SNDRV_SEQ_MAX_CLIENTS; c++) {
2445 client = snd_seq_client_use_ptr(c);
2446 if (client == NULL)
2447 continue;
2448 if (client->type == NO_CLIENT) {
2449 snd_seq_client_unlock(client);
2450 continue;
2451 }
2452
2453 snd_iprintf(buffer, "Client %3d : \"%s\" [%s]\n",
2454 c, client->name,
2455 client->type == USER_CLIENT ? "User" : "Kernel");
2456 snd_seq_info_dump_ports(buffer, client);
2457 if (snd_seq_write_pool_allocated(client)) {
2458 snd_iprintf(buffer, " Output pool :\n");
2459 snd_seq_info_pool(buffer, client->pool, " ");
2460 }
2461 if (client->type == USER_CLIENT && client->data.user.fifo &&
2462 client->data.user.fifo->pool) {
2463 snd_iprintf(buffer, " Input pool :\n");
2464 snd_seq_info_pool(buffer, client->data.user.fifo->pool, " ");
2465 }
2466 snd_seq_client_unlock(client);
2467 }
2468}
cd6a6503 2469#endif /* CONFIG_SND_PROC_FS */
1da177e4
LT		 2470
2471/*---------------------------------------------------------------------------*/
2472
2473
2474/*
2475 * REGISTRATION PART
2476 */
2477
9c2e08c5 2478static const struct file_operations snd_seq_f_ops =
1da177e4
LT		 2479{
2480 .owner = THIS_MODULE,
2481 .read = snd_seq_read,
2482 .write = snd_seq_write,
2483 .open = snd_seq_open,
2484 .release = snd_seq_release,
02f4865f 2485 .llseek = no_llseek,
1da177e4
LT		 2486 .poll = snd_seq_poll,
2487 .unlocked_ioctl = snd_seq_ioctl,
2488 .compat_ioctl = snd_seq_ioctl_compat,
2489};
2490
5205388d
TI		 2491static struct device seq_dev;
2492
1da177e4
LT		 2493/*
2494 * register sequencer device
2495 */
2496int __init snd_sequencer_device_init(void)
2497{
2498 int err;
2499
5205388d
TI		 2500 snd_device_initialize(&seq_dev, NULL);
2501 dev_set_name(&seq_dev, "seq");
2502
1a60d4c5 2503 if (mutex_lock_interruptible(&register_mutex))
1da177e4
LT		 2504 return -ERESTARTSYS;
2505
40a4b263
TI		 2506 err = snd_register_device(SNDRV_DEVICE_TYPE_SEQUENCER, NULL, 0,
2507 &snd_seq_f_ops, NULL, &seq_dev);
5205388d 2508 if (err < 0) {
1a60d4c5 2509 mutex_unlock(&register_mutex);
5205388d 2510 put_device(&seq_dev);
1da177e4
LT		 2511 return err;
2512 }
2513
1a60d4c5 2514 mutex_unlock(&register_mutex);
1da177e4
LT		 2515
2516 return 0;
2517}
2518
2519
2520
2521/*
2522 * unregister sequencer device
2523 */
2524void __exit snd_sequencer_device_done(void)
2525{
40a4b263 2526 snd_unregister_device(&seq_dev);
5205388d 2527 put_device(&seq_dev);
1da177e4 2528}
Linux 6.x block layer and io_uring tree(s)