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pid: Handle failure to allocate the first pid in a pid namespace
[cris-mirror.git] / sound / core / seq / seq_clientmgr.c
blob6e22eea72654e6ce2208500fa7329fc1c2aedf35
1 /*
2 * ALSA sequencer Client Manager
3 * Copyright (c) 1998-2001 by Frank van de Pol <fvdpol@coil.demon.nl>
4 * Jaroslav Kysela <perex@perex.cz>
5 * Takashi Iwai <tiwai@suse.de>
6 *
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 *
22 */
23
24 #include <linux/init.h>
25 #include <linux/export.h>
26 #include <linux/slab.h>
27 #include <sound/core.h>
28 #include <sound/minors.h>
29 #include <linux/kmod.h>
30
31 #include <sound/seq_kernel.h>
32 #include "seq_clientmgr.h"
33 #include "seq_memory.h"
34 #include "seq_queue.h"
35 #include "seq_timer.h"
36 #include "seq_info.h"
37 #include "seq_system.h"
38 #include <sound/seq_device.h>
39 #ifdef CONFIG_COMPAT
40 #include <linux/compat.h>
41 #endif
42
43 /* Client Manager
44
45 * this module handles the connections of userland and kernel clients
46 *
47 */
48
49 /*
50 * There are four ranges of client numbers (last two shared):
51 * 0..15: global clients
52 * 16..127: statically allocated client numbers for cards 0..27
53 * 128..191: dynamically allocated client numbers for cards 28..31
54 * 128..191: dynamically allocated client numbers for applications
55 */
56
57 /* number of kernel non-card clients */
58 #define SNDRV_SEQ_GLOBAL_CLIENTS 16
59 /* clients per cards, for static clients */
60 #define SNDRV_SEQ_CLIENTS_PER_CARD 4
61 /* dynamically allocated client numbers (both kernel drivers and user space) */
62 #define SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN 128
63
64 #define SNDRV_SEQ_LFLG_INPUT 0x0001
65 #define SNDRV_SEQ_LFLG_OUTPUT 0x0002
66 #define SNDRV_SEQ_LFLG_OPEN (SNDRV_SEQ_LFLG_INPUT|SNDRV_SEQ_LFLG_OUTPUT)
67
68 static DEFINE_SPINLOCK(clients_lock);
69 static DEFINE_MUTEX(register_mutex);
70
71 /*
72 * client table
73 */
74 static char clienttablock[SNDRV_SEQ_MAX_CLIENTS];
75 static struct snd_seq_client *clienttab[SNDRV_SEQ_MAX_CLIENTS];
76 static struct snd_seq_usage client_usage;
77
78 /*
79 * prototypes
80 */
81 static int bounce_error_event(struct snd_seq_client *client,
82 struct snd_seq_event *event,
83 int err, int atomic, int hop);
84 static int snd_seq_deliver_single_event(struct snd_seq_client *client,
85 struct snd_seq_event *event,
86 int filter, int atomic, int hop);
87
88 /*
89 */
90 static 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
102 static inline int snd_seq_write_pool_allocated(struct snd_seq_client *client)
103 {
104 return snd_seq_total_cells(client->pool) > 0;
105 }
106
107 /* return pointer to client structure for specified id */
108 static struct snd_seq_client *clientptr(int clientid)
109 {
110 if (clientid < 0 || clientid >= SNDRV_SEQ_MAX_CLIENTS) {
111 pr_debug("ALSA: seq: oops. Trying to get pointer to client %d\n",
112 clientid);
113 return NULL;
114 }
115 return clienttab[clientid];
116 }
117
118 struct snd_seq_client *snd_seq_client_use_ptr(int clientid)
119 {
120 unsigned long flags;
121 struct snd_seq_client *client;
122
123 if (clientid < 0 || clientid >= SNDRV_SEQ_MAX_CLIENTS) {
124 pr_debug("ALSA: seq: oops. Trying to get pointer to client %d\n",
125 clientid);
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);
137 #ifdef CONFIG_MODULES
138 if (!in_interrupt()) {
139 static char client_requested[SNDRV_SEQ_GLOBAL_CLIENTS];
140 static char card_requested[SNDRV_CARDS];
141 if (clientid < SNDRV_SEQ_GLOBAL_CLIENTS) {
142 int idx;
143
144 if (!client_requested[clientid]) {
145 client_requested[clientid] = 1;
146 for (idx = 0; idx < 15; idx++) {
147 if (seq_client_load[idx] < 0)
148 break;
149 if (seq_client_load[idx] == clientid) {
150 request_module("snd-seq-client-%i",
151 clientid);
152 break;
153 }
154 }
155 }
156 } else if (clientid < SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN) {
157 int card = (clientid - SNDRV_SEQ_GLOBAL_CLIENTS) /
158 SNDRV_SEQ_CLIENTS_PER_CARD;
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
182 static void usage_alloc(struct snd_seq_usage *res, int num)
183 {
184 res->cur += num;
185 if (res->cur > res->peak)
186 res->peak = res->cur;
187 }
188
189 static void usage_free(struct snd_seq_usage *res, int num)
190 {
191 res->cur -= num;
192 }
193
194 /* initialise data structures */
195 int __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
204 static struct snd_seq_client *seq_create_client1(int client_index, int poolsize)
205 {
206 unsigned long flags;
207 int c;
208 struct snd_seq_client *client;
209
210 /* init client data */
211 client = kzalloc(sizeof(*client), GFP_KERNEL);
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);
222 mutex_init(&client->ports_mutex);
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) {
228 for (c = SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN;
229 c < SNDRV_SEQ_MAX_CLIENTS;
230 c++) {
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
251 static int seq_free_client1(struct snd_seq_client *client)
252 {
253 unsigned long flags;
254
255 if (!client)
256 return 0;
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
274 static void seq_free_client(struct snd_seq_client * client)
275 {
276 mutex_lock(&register_mutex);
277 switch (client->type) {
278 case NO_CLIENT:
279 pr_warn("ALSA: seq: Trying to free unused client %d\n",
280 client->number);
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:
289 pr_err("ALSA: seq: Trying to free client %d with undefined type = %d\n",
290 client->number, client->type);
291 }
292 mutex_unlock(&register_mutex);
293
294 snd_seq_system_client_ev_client_exit(client->number);
295 }
296
297
298
299 /* -------------------------------------------------------- */
300
301 /* create a user client */
302 static int snd_seq_open(struct inode *inode, struct file *file)
303 {
304 int c, mode; /* client id */
305 struct snd_seq_client *client;
306 struct snd_seq_user_client *user;
307 int err;
308
309 err = nonseekable_open(inode, file);
310 if (err < 0)
311 return err;
312
313 if (mutex_lock_interruptible(&register_mutex))
314 return -ERESTARTSYS;
315 client = seq_create_client1(-1, SNDRV_SEQ_DEFAULT_EVENTS);
316 if (client == NULL) {
317 mutex_unlock(&register_mutex);
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);
337 mutex_unlock(&register_mutex);
338 return -ENOMEM;
339 }
340 }
341
342 usage_alloc(&client_usage, 1);
343 client->type = USER_CLIENT;
344 mutex_unlock(&register_mutex);
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);
352 client->data.user.owner = get_pid(task_pid(current));
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 */
361 static int snd_seq_release(struct inode *inode, struct file *file)
362 {
363 struct snd_seq_client *client = file->private_data;
364
365 if (client) {
366 seq_free_client(client);
367 if (client->data.user.fifo)
368 snd_seq_fifo_delete(&client->data.user.fifo);
369 put_pid(client->data.user.owner);
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 */
384 static ssize_t snd_seq_read(struct file *file, char __user *buf, size_t count,
385 loff_t *offset)
386 {
387 struct snd_seq_client *client = file->private_data;
388 struct snd_seq_fifo *fifo;
389 int err;
390 long result = 0;
391 struct snd_seq_event_cell *cell;
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 */
400 if (snd_BUG_ON(!client))
401 return -ENXIO;
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 */
418 while (count >= sizeof(struct snd_seq_event)) {
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)) {
426 struct snd_seq_event tmpev;
427 tmpev = cell->event;
428 tmpev.data.ext.len &= ~SNDRV_SEQ_EXT_MASK;
429 if (copy_to_user(buf, &tmpev, sizeof(struct snd_seq_event))) {
430 err = -EFAULT;
431 break;
432 }
433 count -= sizeof(struct snd_seq_event);
434 buf += sizeof(struct snd_seq_event);
435 err = snd_seq_expand_var_event(&cell->event, count,
436 (char __force *)buf, 0,
437 sizeof(struct snd_seq_event));
438 if (err < 0)
439 break;
440 result += err;
441 count -= err;
442 buf += err;
443 } else {
444 if (copy_to_user(buf, &cell->event, sizeof(struct snd_seq_event))) {
445 err = -EFAULT;
446 break;
447 }
448 count -= sizeof(struct snd_seq_event);
449 buf += sizeof(struct snd_seq_event);
450 }
451 snd_seq_cell_free(cell);
452 cell = NULL; /* to be sure */
453 result += sizeof(struct snd_seq_event);
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 */
471 static int check_port_perm(struct snd_seq_client_port *port, unsigned int flags)
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 */
482 static struct snd_seq_client *get_event_dest_client(struct snd_seq_event *event,
483 int filter)
484 {
485 struct snd_seq_client *dest;
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 */
516 static int bounce_error_event(struct snd_seq_client *client,
517 struct snd_seq_event *event,
518 int err, int atomic, int hop)
519 {
520 struct snd_seq_event bounce_ev;
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 */
555 static int update_timestamp_of_queue(struct snd_seq_event *event,
556 int queue, int real_time)
557 {
558 struct snd_seq_queue *q;
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 */
584 static int snd_seq_deliver_single_event(struct snd_seq_client *client,
585 struct snd_seq_event *event,
586 int filter, int atomic, int hop)
587 {
588 struct snd_seq_client *dest = NULL;
589 struct snd_seq_client_port *dest_port = NULL;
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;
621 result = dest_port->event_input(event, direct,
622 dest_port->private_data,
623 atomic, hop);
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 */
645 static int deliver_to_subscribers(struct snd_seq_client *client,
646 struct snd_seq_event *event,
647 int atomic, int hop)
648 {
649 struct snd_seq_subscribers *subs;
650 int err, result = 0, num_ev = 0;
651 struct snd_seq_event event_saved;
652 struct snd_seq_client_port *src_port;
653 struct snd_seq_port_subs_info *grp;
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_nested(&grp->list_mutex, hop);
667 list_for_each_entry(subs, &grp->list_head, src_list) {
668 /* both ports ready? */
669 if (atomic_read(&subs->ref_count) != 2)
670 continue;
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);
678 if (err < 0) {
679 /* save first error that occurs and continue */
680 if (!result)
681 result = err;
682 continue;
683 }
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);
694 return (result < 0) ? result : num_ev;
695 }
696
697
698 #ifdef SUPPORT_BROADCAST
699 /*
700 * broadcast to all ports:
701 */
702 static int port_broadcast_event(struct snd_seq_client *client,
703 struct snd_seq_event *event,
704 int atomic, int hop)
705 {
706 int num_ev = 0, err, result = 0;
707 struct snd_seq_client *dest_client;
708 struct snd_seq_client_port *port;
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);
715 list_for_each_entry(port, &dest_client->ports_list_head, list) {
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);
721 if (err < 0) {
722 /* save first error that occurs and continue */
723 if (!result)
724 result = err;
725 continue;
726 }
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 */
732 return (result < 0) ? result : num_ev;
733 }
734
735 /*
736 * send the event to all clients:
737 * if destination port is also ADDRESS_BROADCAST, deliver to all ports.
738 */
739 static int broadcast_event(struct snd_seq_client *client,
740 struct snd_seq_event *event, int atomic, int hop)
741 {
742 int err, result = 0, num_ev = 0;
743 int dest;
744 struct snd_seq_addr addr;
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);
761 if (err < 0) {
762 /* save first error that occurs and continue */
763 if (!result)
764 result = err;
765 continue;
766 }
767 num_ev += err;
768 }
769 event->dest = addr; /* restore */
770 return (result < 0) ? result : num_ev;
771 }
772
773
774 /* multicast - not supported yet */
775 static int multicast_event(struct snd_seq_client *client, struct snd_seq_event *event,
776 int atomic, int hop)
777 {
778 pr_debug("ALSA: seq: multicast not supported yet.\n");
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 */
792 static int snd_seq_deliver_event(struct snd_seq_client *client, struct snd_seq_event *event,
793 int atomic, int hop)
794 {
795 int result;
796
797 hop++;
798 if (hop >= SNDRV_SEQ_MAX_HOPS) {
799 pr_debug("ALSA: seq: too long delivery path (%d:%d->%d:%d)\n",
800 event->source.client, event->source.port,
801 event->dest.client, event->dest.port);
802 return -EMLINK;
803 }
804
805 if (snd_seq_ev_is_variable(event) &&
806 snd_BUG_ON(atomic && (event->data.ext.len & SNDRV_SEQ_EXT_USRPTR)))
807 return -EINVAL;
808
809 if (event->queue == SNDRV_SEQ_ADDRESS_SUBSCRIBERS ||
810 event->dest.client == SNDRV_SEQ_ADDRESS_SUBSCRIBERS)
811 result = deliver_to_subscribers(client, event, atomic, hop);
812 #ifdef SUPPORT_BROADCAST
813 else if (event->queue == SNDRV_SEQ_ADDRESS_BROADCAST ||
814 event->dest.client == SNDRV_SEQ_ADDRESS_BROADCAST)
815 result = broadcast_event(client, event, atomic, hop);
816 else if (event->dest.client >= SNDRV_SEQ_MAX_CLIENTS)
817 result = multicast_event(client, event, atomic, hop);
818 else if (event->dest.port == SNDRV_SEQ_ADDRESS_BROADCAST)
819 result = port_broadcast_event(client, event, atomic, hop);
820 #endif
821 else
822 result = snd_seq_deliver_single_event(client, event, 0, atomic, hop);
823
824 return result;
825 }
826
827 /*
828 * dispatch an event cell:
829 * This function is called only from queue check routines in timer
830 * interrupts or after enqueued.
831 * The event cell shall be released or re-queued in this function.
832 *
833 * RETURN VALUE: n > 0 : the number of delivered events.
834 * n == 0 : the event was not passed to any client.
835 * n < 0 : error - event was not processed.
836 */
837 int snd_seq_dispatch_event(struct snd_seq_event_cell *cell, int atomic, int hop)
838 {
839 struct snd_seq_client *client;
840 int result;
841
842 if (snd_BUG_ON(!cell))
843 return -EINVAL;
844
845 client = snd_seq_client_use_ptr(cell->event.source.client);
846 if (client == NULL) {
847 snd_seq_cell_free(cell); /* release this cell */
848 return -EINVAL;
849 }
850
851 if (cell->event.type == SNDRV_SEQ_EVENT_NOTE) {
852 /* NOTE event:
853 * the event cell is re-used as a NOTE-OFF event and
854 * enqueued again.
855 */
856 struct snd_seq_event tmpev, *ev;
857
858 /* reserve this event to enqueue note-off later */
859 tmpev = cell->event;
860 tmpev.type = SNDRV_SEQ_EVENT_NOTEON;
861 result = snd_seq_deliver_event(client, &tmpev, atomic, hop);
862
863 /*
864 * This was originally a note event. We now re-use the
865 * cell for the note-off event.
866 */
867
868 ev = &cell->event;
869 ev->type = SNDRV_SEQ_EVENT_NOTEOFF;
870 ev->flags |= SNDRV_SEQ_PRIORITY_HIGH;
871
872 /* add the duration time */
873 switch (ev->flags & SNDRV_SEQ_TIME_STAMP_MASK) {
874 case SNDRV_SEQ_TIME_STAMP_TICK:
875 ev->time.tick += ev->data.note.duration;
876 break;
877 case SNDRV_SEQ_TIME_STAMP_REAL:
878 /* unit for duration is ms */
879 ev->time.time.tv_nsec += 1000000 * (ev->data.note.duration % 1000);
880 ev->time.time.tv_sec += ev->data.note.duration / 1000 +
881 ev->time.time.tv_nsec / 1000000000;
882 ev->time.time.tv_nsec %= 1000000000;
883 break;
884 }
885 ev->data.note.velocity = ev->data.note.off_velocity;
886
887 /* Now queue this cell as the note off event */
888 if (snd_seq_enqueue_event(cell, atomic, hop) < 0)
889 snd_seq_cell_free(cell); /* release this cell */
890
891 } else {
892 /* Normal events:
893 * event cell is freed after processing the event
894 */
895
896 result = snd_seq_deliver_event(client, &cell->event, atomic, hop);
897 snd_seq_cell_free(cell);
898 }
899
900 snd_seq_client_unlock(client);
901 return result;
902 }
903
904
905 /* Allocate a cell from client pool and enqueue it to queue:
906 * if pool is empty and blocking is TRUE, sleep until a new cell is
907 * available.
908 */
909 static int snd_seq_client_enqueue_event(struct snd_seq_client *client,
910 struct snd_seq_event *event,
911 struct file *file, int blocking,
912 int atomic, int hop)
913 {
914 struct snd_seq_event_cell *cell;
915 int err;
916
917 /* special queue values - force direct passing */
918 if (event->queue == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) {
919 event->dest.client = SNDRV_SEQ_ADDRESS_SUBSCRIBERS;
920 event->queue = SNDRV_SEQ_QUEUE_DIRECT;
921 } else
922 #ifdef SUPPORT_BROADCAST
923 if (event->queue == SNDRV_SEQ_ADDRESS_BROADCAST) {
924 event->dest.client = SNDRV_SEQ_ADDRESS_BROADCAST;
925 event->queue = SNDRV_SEQ_QUEUE_DIRECT;
926 }
927 #endif
928 if (event->dest.client == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) {
929 /* check presence of source port */
930 struct snd_seq_client_port *src_port = snd_seq_port_use_ptr(client, event->source.port);
931 if (src_port == NULL)
932 return -EINVAL;
933 snd_seq_port_unlock(src_port);
934 }
935
936 /* direct event processing without enqueued */
937 if (snd_seq_ev_is_direct(event)) {
938 if (event->type == SNDRV_SEQ_EVENT_NOTE)
939 return -EINVAL; /* this event must be enqueued! */
940 return snd_seq_deliver_event(client, event, atomic, hop);
941 }
942
943 /* Not direct, normal queuing */
944 if (snd_seq_queue_is_used(event->queue, client->number) <= 0)
945 return -EINVAL; /* invalid queue */
946 if (! snd_seq_write_pool_allocated(client))
947 return -ENXIO; /* queue is not allocated */
948
949 /* allocate an event cell */
950 err = snd_seq_event_dup(client->pool, event, &cell, !blocking || atomic, file);
951 if (err < 0)
952 return err;
953
954 /* we got a cell. enqueue it. */
955 if ((err = snd_seq_enqueue_event(cell, atomic, hop)) < 0) {
956 snd_seq_cell_free(cell);
957 return err;
958 }
959
960 return 0;
961 }
962
963
964 /*
965 * check validity of event type and data length.
966 * return non-zero if invalid.
967 */
968 static int check_event_type_and_length(struct snd_seq_event *ev)
969 {
970 switch (snd_seq_ev_length_type(ev)) {
971 case SNDRV_SEQ_EVENT_LENGTH_FIXED:
972 if (snd_seq_ev_is_variable_type(ev))
973 return -EINVAL;
974 break;
975 case SNDRV_SEQ_EVENT_LENGTH_VARIABLE:
976 if (! snd_seq_ev_is_variable_type(ev) ||
977 (ev->data.ext.len & ~SNDRV_SEQ_EXT_MASK) >= SNDRV_SEQ_MAX_EVENT_LEN)
978 return -EINVAL;
979 break;
980 case SNDRV_SEQ_EVENT_LENGTH_VARUSR:
981 if (! snd_seq_ev_is_direct(ev))
982 return -EINVAL;
983 break;
984 }
985 return 0;
986 }
987
988
989 /* handle write() */
990 /* possible error values:
991 * -ENXIO invalid client or file open mode
992 * -ENOMEM malloc failed
993 * -EFAULT seg. fault during copy from user space
994 * -EINVAL invalid event
995 * -EAGAIN no space in output pool
996 * -EINTR interrupts while sleep
997 * -EMLINK too many hops
998 * others depends on return value from driver callback
999 */
1000 static ssize_t snd_seq_write(struct file *file, const char __user *buf,
1001 size_t count, loff_t *offset)
1002 {
1003 struct snd_seq_client *client = file->private_data;
1004 int written = 0, len;
1005 int err = -EINVAL;
1006 struct snd_seq_event event;
1007
1008 if (!(snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT))
1009 return -ENXIO;
1010
1011 /* check client structures are in place */
1012 if (snd_BUG_ON(!client))
1013 return -ENXIO;
1014
1015 if (!client->accept_output || client->pool == NULL)
1016 return -ENXIO;
1017
1018 /* allocate the pool now if the pool is not allocated yet */
1019 if (client->pool->size > 0 && !snd_seq_write_pool_allocated(client)) {
1020 if (snd_seq_pool_init(client->pool) < 0)
1021 return -ENOMEM;
1022 }
1023
1024 /* only process whole events */
1025 while (count >= sizeof(struct snd_seq_event)) {
1026 /* Read in the event header from the user */
1027 len = sizeof(event);
1028 if (copy_from_user(&event, buf, len)) {
1029 err = -EFAULT;
1030 break;
1031 }
1032 event.source.client = client->number; /* fill in client number */
1033 /* Check for extension data length */
1034 if (check_event_type_and_length(&event)) {
1035 err = -EINVAL;
1036 break;
1037 }
1038
1039 /* check for special events */
1040 if (event.type == SNDRV_SEQ_EVENT_NONE)
1041 goto __skip_event;
1042 else if (snd_seq_ev_is_reserved(&event)) {
1043 err = -EINVAL;
1044 break;
1045 }
1046
1047 if (snd_seq_ev_is_variable(&event)) {
1048 int extlen = event.data.ext.len & ~SNDRV_SEQ_EXT_MASK;
1049 if ((size_t)(extlen + len) > count) {
1050 /* back out, will get an error this time or next */
1051 err = -EINVAL;
1052 break;
1053 }
1054 /* set user space pointer */
1055 event.data.ext.len = extlen | SNDRV_SEQ_EXT_USRPTR;
1056 event.data.ext.ptr = (char __force *)buf
1057 + sizeof(struct snd_seq_event);
1058 len += extlen; /* increment data length */
1059 } else {
1060 #ifdef CONFIG_COMPAT
1061 if (client->convert32 && snd_seq_ev_is_varusr(&event)) {
1062 void *ptr = (void __force *)compat_ptr(event.data.raw32.d[1]);
1063 event.data.ext.ptr = ptr;
1064 }
1065 #endif
1066 }
1067
1068 /* ok, enqueue it */
1069 err = snd_seq_client_enqueue_event(client, &event, file,
1070 !(file->f_flags & O_NONBLOCK),
1071 0, 0);
1072 if (err < 0)
1073 break;
1074
1075 __skip_event:
1076 /* Update pointers and counts */
1077 count -= len;
1078 buf += len;
1079 written += len;
1080 }
1081
1082 return written ? written : err;
1083 }
1084
1085
1086 /*
1087 * handle polling
1088 */
1089 static unsigned int snd_seq_poll(struct file *file, poll_table * wait)
1090 {
1091 struct snd_seq_client *client = file->private_data;
1092 unsigned int mask = 0;
1093
1094 /* check client structures are in place */
1095 if (snd_BUG_ON(!client))
1096 return -ENXIO;
1097
1098 if ((snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_INPUT) &&
1099 client->data.user.fifo) {
1100
1101 /* check if data is available in the outqueue */
1102 if (snd_seq_fifo_poll_wait(client->data.user.fifo, file, wait))
1103 mask |= POLLIN | POLLRDNORM;
1104 }
1105
1106 if (snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT) {
1107
1108 /* check if data is available in the pool */
1109 if (!snd_seq_write_pool_allocated(client) ||
1110 snd_seq_pool_poll_wait(client->pool, file, wait))
1111 mask |= POLLOUT | POLLWRNORM;
1112 }
1113
1114 return mask;
1115 }
1116
1117
1118 /*-----------------------------------------------------*/
1119
1120 static int snd_seq_ioctl_pversion(struct snd_seq_client *client, void *arg)
1121 {
1122 int *pversion = arg;
1123
1124 *pversion = SNDRV_SEQ_VERSION;
1125 return 0;
1126 }
1127
1128 static int snd_seq_ioctl_client_id(struct snd_seq_client *client, void *arg)
1129 {
1130 int *client_id = arg;
1131
1132 *client_id = client->number;
1133 return 0;
1134 }
1135
1136 /* SYSTEM_INFO ioctl() */
1137 static int snd_seq_ioctl_system_info(struct snd_seq_client *client, void *arg)
1138 {
1139 struct snd_seq_system_info *info = arg;
1140
1141 memset(info, 0, sizeof(*info));
1142 /* fill the info fields */
1143 info->queues = SNDRV_SEQ_MAX_QUEUES;
1144 info->clients = SNDRV_SEQ_MAX_CLIENTS;
1145 info->ports = SNDRV_SEQ_MAX_PORTS;
1146 info->channels = 256; /* fixed limit */
1147 info->cur_clients = client_usage.cur;
1148 info->cur_queues = snd_seq_queue_get_cur_queues();
1149
1150 return 0;
1151 }
1152
1153
1154 /* RUNNING_MODE ioctl() */
1155 static int snd_seq_ioctl_running_mode(struct snd_seq_client *client, void *arg)
1156 {
1157 struct snd_seq_running_info *info = arg;
1158 struct snd_seq_client *cptr;
1159 int err = 0;
1160
1161 /* requested client number */
1162 cptr = snd_seq_client_use_ptr(info->client);
1163 if (cptr == NULL)
1164 return -ENOENT; /* don't change !!! */
1165
1166 #ifdef SNDRV_BIG_ENDIAN
1167 if (!info->big_endian) {
1168 err = -EINVAL;
1169 goto __err;
1170 }
1171 #else
1172 if (info->big_endian) {
1173 err = -EINVAL;
1174 goto __err;
1175 }
1176
1177 #endif
1178 if (info->cpu_mode > sizeof(long)) {
1179 err = -EINVAL;
1180 goto __err;
1181 }
1182 cptr->convert32 = (info->cpu_mode < sizeof(long));
1183 __err:
1184 snd_seq_client_unlock(cptr);
1185 return err;
1186 }
1187
1188 /* CLIENT_INFO ioctl() */
1189 static void get_client_info(struct snd_seq_client *cptr,
1190 struct snd_seq_client_info *info)
1191 {
1192 info->client = cptr->number;
1193
1194 /* fill the info fields */
1195 info->type = cptr->type;
1196 strcpy(info->name, cptr->name);
1197 info->filter = cptr->filter;
1198 info->event_lost = cptr->event_lost;
1199 memcpy(info->event_filter, cptr->event_filter, 32);
1200 info->num_ports = cptr->num_ports;
1201
1202 if (cptr->type == USER_CLIENT)
1203 info->pid = pid_vnr(cptr->data.user.owner);
1204 else
1205 info->pid = -1;
1206
1207 if (cptr->type == KERNEL_CLIENT)
1208 info->card = cptr->data.kernel.card ? cptr->data.kernel.card->number : -1;
1209 else
1210 info->card = -1;
1211
1212 memset(info->reserved, 0, sizeof(info->reserved));
1213 }
1214
1215 static int snd_seq_ioctl_get_client_info(struct snd_seq_client *client,
1216 void *arg)
1217 {
1218 struct snd_seq_client_info *client_info = arg;
1219 struct snd_seq_client *cptr;
1220
1221 /* requested client number */
1222 cptr = snd_seq_client_use_ptr(client_info->client);
1223 if (cptr == NULL)
1224 return -ENOENT; /* don't change !!! */
1225
1226 get_client_info(cptr, client_info);
1227 snd_seq_client_unlock(cptr);
1228
1229 return 0;
1230 }
1231
1232
1233 /* CLIENT_INFO ioctl() */
1234 static int snd_seq_ioctl_set_client_info(struct snd_seq_client *client,
1235 void *arg)
1236 {
1237 struct snd_seq_client_info *client_info = arg;
1238
1239 /* it is not allowed to set the info fields for an another client */
1240 if (client->number != client_info->client)
1241 return -EPERM;
1242 /* also client type must be set now */
1243 if (client->type != client_info->type)
1244 return -EINVAL;
1245
1246 /* fill the info fields */
1247 if (client_info->name[0])
1248 strlcpy(client->name, client_info->name, sizeof(client->name));
1249
1250 client->filter = client_info->filter;
1251 client->event_lost = client_info->event_lost;
1252 memcpy(client->event_filter, client_info->event_filter, 32);
1253
1254 return 0;
1255 }
1256
1257
1258 /*
1259 * CREATE PORT ioctl()
1260 */
1261 static int snd_seq_ioctl_create_port(struct snd_seq_client *client, void *arg)
1262 {
1263 struct snd_seq_port_info *info = arg;
1264 struct snd_seq_client_port *port;
1265 struct snd_seq_port_callback *callback;
1266 int port_idx;
1267
1268 /* it is not allowed to create the port for an another client */
1269 if (info->addr.client != client->number)
1270 return -EPERM;
1271
1272 port = snd_seq_create_port(client, (info->flags & SNDRV_SEQ_PORT_FLG_GIVEN_PORT) ? info->addr.port : -1);
1273 if (port == NULL)
1274 return -ENOMEM;
1275
1276 if (client->type == USER_CLIENT && info->kernel) {
1277 port_idx = port->addr.port;
1278 snd_seq_port_unlock(port);
1279 snd_seq_delete_port(client, port_idx);
1280 return -EINVAL;
1281 }
1282 if (client->type == KERNEL_CLIENT) {
1283 if ((callback = info->kernel) != NULL) {
1284 if (callback->owner)
1285 port->owner = callback->owner;
1286 port->private_data = callback->private_data;
1287 port->private_free = callback->private_free;
1288 port->event_input = callback->event_input;
1289 port->c_src.open = callback->subscribe;
1290 port->c_src.close = callback->unsubscribe;
1291 port->c_dest.open = callback->use;
1292 port->c_dest.close = callback->unuse;
1293 }
1294 }
1295
1296 info->addr = port->addr;
1297
1298 snd_seq_set_port_info(port, info);
1299 snd_seq_system_client_ev_port_start(port->addr.client, port->addr.port);
1300 snd_seq_port_unlock(port);
1301
1302 return 0;
1303 }
1304
1305 /*
1306 * DELETE PORT ioctl()
1307 */
1308 static int snd_seq_ioctl_delete_port(struct snd_seq_client *client, void *arg)
1309 {
1310 struct snd_seq_port_info *info = arg;
1311 int err;
1312
1313 /* it is not allowed to remove the port for an another client */
1314 if (info->addr.client != client->number)
1315 return -EPERM;
1316
1317 err = snd_seq_delete_port(client, info->addr.port);
1318 if (err >= 0)
1319 snd_seq_system_client_ev_port_exit(client->number, info->addr.port);
1320 return err;
1321 }
1322
1323
1324 /*
1325 * GET_PORT_INFO ioctl() (on any client)
1326 */
1327 static int snd_seq_ioctl_get_port_info(struct snd_seq_client *client, void *arg)
1328 {
1329 struct snd_seq_port_info *info = arg;
1330 struct snd_seq_client *cptr;
1331 struct snd_seq_client_port *port;
1332
1333 cptr = snd_seq_client_use_ptr(info->addr.client);
1334 if (cptr == NULL)
1335 return -ENXIO;
1336
1337 port = snd_seq_port_use_ptr(cptr, info->addr.port);
1338 if (port == NULL) {
1339 snd_seq_client_unlock(cptr);
1340 return -ENOENT; /* don't change */
1341 }
1342
1343 /* get port info */
1344 snd_seq_get_port_info(port, info);
1345 snd_seq_port_unlock(port);
1346 snd_seq_client_unlock(cptr);
1347
1348 return 0;
1349 }
1350
1351
1352 /*
1353 * SET_PORT_INFO ioctl() (only ports on this/own client)
1354 */
1355 static int snd_seq_ioctl_set_port_info(struct snd_seq_client *client, void *arg)
1356 {
1357 struct snd_seq_port_info *info = arg;
1358 struct snd_seq_client_port *port;
1359
1360 if (info->addr.client != client->number) /* only set our own ports ! */
1361 return -EPERM;
1362 port = snd_seq_port_use_ptr(client, info->addr.port);
1363 if (port) {
1364 snd_seq_set_port_info(port, info);
1365 snd_seq_port_unlock(port);
1366 }
1367 return 0;
1368 }
1369
1370
1371 /*
1372 * port subscription (connection)
1373 */
1374 #define PERM_RD (SNDRV_SEQ_PORT_CAP_READ|SNDRV_SEQ_PORT_CAP_SUBS_READ)
1375 #define PERM_WR (SNDRV_SEQ_PORT_CAP_WRITE|SNDRV_SEQ_PORT_CAP_SUBS_WRITE)
1376
1377 static int check_subscription_permission(struct snd_seq_client *client,
1378 struct snd_seq_client_port *sport,
1379 struct snd_seq_client_port *dport,
1380 struct snd_seq_port_subscribe *subs)
1381 {
1382 if (client->number != subs->sender.client &&
1383 client->number != subs->dest.client) {
1384 /* connection by third client - check export permission */
1385 if (check_port_perm(sport, SNDRV_SEQ_PORT_CAP_NO_EXPORT))
1386 return -EPERM;
1387 if (check_port_perm(dport, SNDRV_SEQ_PORT_CAP_NO_EXPORT))
1388 return -EPERM;
1389 }
1390
1391 /* check read permission */
1392 /* if sender or receiver is the subscribing client itself,
1393 * no permission check is necessary
1394 */
1395 if (client->number != subs->sender.client) {
1396 if (! check_port_perm(sport, PERM_RD))
1397 return -EPERM;
1398 }
1399 /* check write permission */
1400 if (client->number != subs->dest.client) {
1401 if (! check_port_perm(dport, PERM_WR))
1402 return -EPERM;
1403 }
1404 return 0;
1405 }
1406
1407 /*
1408 * send an subscription notify event to user client:
1409 * client must be user client.
1410 */
1411 int snd_seq_client_notify_subscription(int client, int port,
1412 struct snd_seq_port_subscribe *info,
1413 int evtype)
1414 {
1415 struct snd_seq_event event;
1416
1417 memset(&event, 0, sizeof(event));
1418 event.type = evtype;
1419 event.data.connect.dest = info->dest;
1420 event.data.connect.sender = info->sender;
1421
1422 return snd_seq_system_notify(client, port, &event); /* non-atomic */
1423 }
1424
1425
1426 /*
1427 * add to port's subscription list IOCTL interface
1428 */
1429 static int snd_seq_ioctl_subscribe_port(struct snd_seq_client *client,
1430 void *arg)
1431 {
1432 struct snd_seq_port_subscribe *subs = arg;
1433 int result = -EINVAL;
1434 struct snd_seq_client *receiver = NULL, *sender = NULL;
1435 struct snd_seq_client_port *sport = NULL, *dport = NULL;
1436
1437 if ((receiver = snd_seq_client_use_ptr(subs->dest.client)) == NULL)
1438 goto __end;
1439 if ((sender = snd_seq_client_use_ptr(subs->sender.client)) == NULL)
1440 goto __end;
1441 if ((sport = snd_seq_port_use_ptr(sender, subs->sender.port)) == NULL)
1442 goto __end;
1443 if ((dport = snd_seq_port_use_ptr(receiver, subs->dest.port)) == NULL)
1444 goto __end;
1445
1446 result = check_subscription_permission(client, sport, dport, subs);
1447 if (result < 0)
1448 goto __end;
1449
1450 /* connect them */
1451 result = snd_seq_port_connect(client, sender, sport, receiver, dport, subs);
1452 if (! result) /* broadcast announce */
1453 snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0,
1454 subs, SNDRV_SEQ_EVENT_PORT_SUBSCRIBED);
1455 __end:
1456 if (sport)
1457 snd_seq_port_unlock(sport);
1458 if (dport)
1459 snd_seq_port_unlock(dport);
1460 if (sender)
1461 snd_seq_client_unlock(sender);
1462 if (receiver)
1463 snd_seq_client_unlock(receiver);
1464 return result;
1465 }
1466
1467
1468 /*
1469 * remove from port's subscription list
1470 */
1471 static int snd_seq_ioctl_unsubscribe_port(struct snd_seq_client *client,
1472 void *arg)
1473 {
1474 struct snd_seq_port_subscribe *subs = arg;
1475 int result = -ENXIO;
1476 struct snd_seq_client *receiver = NULL, *sender = NULL;
1477 struct snd_seq_client_port *sport = NULL, *dport = NULL;
1478
1479 if ((receiver = snd_seq_client_use_ptr(subs->dest.client)) == NULL)
1480 goto __end;
1481 if ((sender = snd_seq_client_use_ptr(subs->sender.client)) == NULL)
1482 goto __end;
1483 if ((sport = snd_seq_port_use_ptr(sender, subs->sender.port)) == NULL)
1484 goto __end;
1485 if ((dport = snd_seq_port_use_ptr(receiver, subs->dest.port)) == NULL)
1486 goto __end;
1487
1488 result = check_subscription_permission(client, sport, dport, subs);
1489 if (result < 0)
1490 goto __end;
1491
1492 result = snd_seq_port_disconnect(client, sender, sport, receiver, dport, subs);
1493 if (! result) /* broadcast announce */
1494 snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0,
1495 subs, SNDRV_SEQ_EVENT_PORT_UNSUBSCRIBED);
1496 __end:
1497 if (sport)
1498 snd_seq_port_unlock(sport);
1499 if (dport)
1500 snd_seq_port_unlock(dport);
1501 if (sender)
1502 snd_seq_client_unlock(sender);
1503 if (receiver)
1504 snd_seq_client_unlock(receiver);
1505 return result;
1506 }
1507
1508
1509 /* CREATE_QUEUE ioctl() */
1510 static int snd_seq_ioctl_create_queue(struct snd_seq_client *client, void *arg)
1511 {
1512 struct snd_seq_queue_info *info = arg;
1513 struct snd_seq_queue *q;
1514
1515 q = snd_seq_queue_alloc(client->number, info->locked, info->flags);
1516 if (IS_ERR(q))
1517 return PTR_ERR(q);
1518
1519 info->queue = q->queue;
1520 info->locked = q->locked;
1521 info->owner = q->owner;
1522
1523 /* set queue name */
1524 if (!info->name[0])
1525 snprintf(info->name, sizeof(info->name), "Queue-%d", q->queue);
1526 strlcpy(q->name, info->name, sizeof(q->name));
1527 snd_use_lock_free(&q->use_lock);
1528
1529 return 0;
1530 }
1531
1532 /* DELETE_QUEUE ioctl() */
1533 static int snd_seq_ioctl_delete_queue(struct snd_seq_client *client, void *arg)
1534 {
1535 struct snd_seq_queue_info *info = arg;
1536
1537 return snd_seq_queue_delete(client->number, info->queue);
1538 }
1539
1540 /* GET_QUEUE_INFO ioctl() */
1541 static int snd_seq_ioctl_get_queue_info(struct snd_seq_client *client,
1542 void *arg)
1543 {
1544 struct snd_seq_queue_info *info = arg;
1545 struct snd_seq_queue *q;
1546
1547 q = queueptr(info->queue);
1548 if (q == NULL)
1549 return -EINVAL;
1550
1551 memset(info, 0, sizeof(*info));
1552 info->queue = q->queue;
1553 info->owner = q->owner;
1554 info->locked = q->locked;
1555 strlcpy(info->name, q->name, sizeof(info->name));
1556 queuefree(q);
1557
1558 return 0;
1559 }
1560
1561 /* SET_QUEUE_INFO ioctl() */
1562 static int snd_seq_ioctl_set_queue_info(struct snd_seq_client *client,
1563 void *arg)
1564 {
1565 struct snd_seq_queue_info *info = arg;
1566 struct snd_seq_queue *q;
1567
1568 if (info->owner != client->number)
1569 return -EINVAL;
1570
1571 /* change owner/locked permission */
1572 if (snd_seq_queue_check_access(info->queue, client->number)) {
1573 if (snd_seq_queue_set_owner(info->queue, client->number, info->locked) < 0)
1574 return -EPERM;
1575 if (info->locked)
1576 snd_seq_queue_use(info->queue, client->number, 1);
1577 } else {
1578 return -EPERM;
1579 }
1580
1581 q = queueptr(info->queue);
1582 if (! q)
1583 return -EINVAL;
1584 if (q->owner != client->number) {
1585 queuefree(q);
1586 return -EPERM;
1587 }
1588 strlcpy(q->name, info->name, sizeof(q->name));
1589 queuefree(q);
1590
1591 return 0;
1592 }
1593
1594 /* GET_NAMED_QUEUE ioctl() */
1595 static int snd_seq_ioctl_get_named_queue(struct snd_seq_client *client,
1596 void *arg)
1597 {
1598 struct snd_seq_queue_info *info = arg;
1599 struct snd_seq_queue *q;
1600
1601 q = snd_seq_queue_find_name(info->name);
1602 if (q == NULL)
1603 return -EINVAL;
1604 info->queue = q->queue;
1605 info->owner = q->owner;
1606 info->locked = q->locked;
1607 queuefree(q);
1608
1609 return 0;
1610 }
1611
1612 /* GET_QUEUE_STATUS ioctl() */
1613 static int snd_seq_ioctl_get_queue_status(struct snd_seq_client *client,
1614 void *arg)
1615 {
1616 struct snd_seq_queue_status *status = arg;
1617 struct snd_seq_queue *queue;
1618 struct snd_seq_timer *tmr;
1619
1620 queue = queueptr(status->queue);
1621 if (queue == NULL)
1622 return -EINVAL;
1623 memset(status, 0, sizeof(*status));
1624 status->queue = queue->queue;
1625
1626 tmr = queue->timer;
1627 status->events = queue->tickq->cells + queue->timeq->cells;
1628
1629 status->time = snd_seq_timer_get_cur_time(tmr);
1630 status->tick = snd_seq_timer_get_cur_tick(tmr);
1631
1632 status->running = tmr->running;
1633
1634 status->flags = queue->flags;
1635 queuefree(queue);
1636
1637 return 0;
1638 }
1639
1640
1641 /* GET_QUEUE_TEMPO ioctl() */
1642 static int snd_seq_ioctl_get_queue_tempo(struct snd_seq_client *client,
1643 void *arg)
1644 {
1645 struct snd_seq_queue_tempo *tempo = arg;
1646 struct snd_seq_queue *queue;
1647 struct snd_seq_timer *tmr;
1648
1649 queue = queueptr(tempo->queue);
1650 if (queue == NULL)
1651 return -EINVAL;
1652 memset(tempo, 0, sizeof(*tempo));
1653 tempo->queue = queue->queue;
1654
1655 tmr = queue->timer;
1656
1657 tempo->tempo = tmr->tempo;
1658 tempo->ppq = tmr->ppq;
1659 tempo->skew_value = tmr->skew;
1660 tempo->skew_base = tmr->skew_base;
1661 queuefree(queue);
1662
1663 return 0;
1664 }
1665
1666
1667 /* SET_QUEUE_TEMPO ioctl() */
1668 int snd_seq_set_queue_tempo(int client, struct snd_seq_queue_tempo *tempo)
1669 {
1670 if (!snd_seq_queue_check_access(tempo->queue, client))
1671 return -EPERM;
1672 return snd_seq_queue_timer_set_tempo(tempo->queue, client, tempo);
1673 }
1674 EXPORT_SYMBOL(snd_seq_set_queue_tempo);
1675
1676 static int snd_seq_ioctl_set_queue_tempo(struct snd_seq_client *client,
1677 void *arg)
1678 {
1679 struct snd_seq_queue_tempo *tempo = arg;
1680 int result;
1681
1682 result = snd_seq_set_queue_tempo(client->number, tempo);
1683 return result < 0 ? result : 0;
1684 }
1685
1686
1687 /* GET_QUEUE_TIMER ioctl() */
1688 static int snd_seq_ioctl_get_queue_timer(struct snd_seq_client *client,
1689 void *arg)
1690 {
1691 struct snd_seq_queue_timer *timer = arg;
1692 struct snd_seq_queue *queue;
1693 struct snd_seq_timer *tmr;
1694
1695 queue = queueptr(timer->queue);
1696 if (queue == NULL)
1697 return -EINVAL;
1698
1699 if (mutex_lock_interruptible(&queue->timer_mutex)) {
1700 queuefree(queue);
1701 return -ERESTARTSYS;
1702 }
1703 tmr = queue->timer;
1704 memset(timer, 0, sizeof(*timer));
1705 timer->queue = queue->queue;
1706
1707 timer->type = tmr->type;
1708 if (tmr->type == SNDRV_SEQ_TIMER_ALSA) {
1709 timer->u.alsa.id = tmr->alsa_id;
1710 timer->u.alsa.resolution = tmr->preferred_resolution;
1711 }
1712 mutex_unlock(&queue->timer_mutex);
1713 queuefree(queue);
1714
1715 return 0;
1716 }
1717
1718
1719 /* SET_QUEUE_TIMER ioctl() */
1720 static int snd_seq_ioctl_set_queue_timer(struct snd_seq_client *client,
1721 void *arg)
1722 {
1723 struct snd_seq_queue_timer *timer = arg;
1724 int result = 0;
1725
1726 if (timer->type != SNDRV_SEQ_TIMER_ALSA)
1727 return -EINVAL;
1728
1729 if (snd_seq_queue_check_access(timer->queue, client->number)) {
1730 struct snd_seq_queue *q;
1731 struct snd_seq_timer *tmr;
1732
1733 q = queueptr(timer->queue);
1734 if (q == NULL)
1735 return -ENXIO;
1736 if (mutex_lock_interruptible(&q->timer_mutex)) {
1737 queuefree(q);
1738 return -ERESTARTSYS;
1739 }
1740 tmr = q->timer;
1741 snd_seq_queue_timer_close(timer->queue);
1742 tmr->type = timer->type;
1743 if (tmr->type == SNDRV_SEQ_TIMER_ALSA) {
1744 tmr->alsa_id = timer->u.alsa.id;
1745 tmr->preferred_resolution = timer->u.alsa.resolution;
1746 }
1747 result = snd_seq_queue_timer_open(timer->queue);
1748 mutex_unlock(&q->timer_mutex);
1749 queuefree(q);
1750 } else {
1751 return -EPERM;
1752 }
1753
1754 return result;
1755 }
1756
1757
1758 /* GET_QUEUE_CLIENT ioctl() */
1759 static int snd_seq_ioctl_get_queue_client(struct snd_seq_client *client,
1760 void *arg)
1761 {
1762 struct snd_seq_queue_client *info = arg;
1763 int used;
1764
1765 used = snd_seq_queue_is_used(info->queue, client->number);
1766 if (used < 0)
1767 return -EINVAL;
1768 info->used = used;
1769 info->client = client->number;
1770
1771 return 0;
1772 }
1773
1774
1775 /* SET_QUEUE_CLIENT ioctl() */
1776 static int snd_seq_ioctl_set_queue_client(struct snd_seq_client *client,
1777 void *arg)
1778 {
1779 struct snd_seq_queue_client *info = arg;
1780 int err;
1781
1782 if (info->used >= 0) {
1783 err = snd_seq_queue_use(info->queue, client->number, info->used);
1784 if (err < 0)
1785 return err;
1786 }
1787
1788 return snd_seq_ioctl_get_queue_client(client, arg);
1789 }
1790
1791
1792 /* GET_CLIENT_POOL ioctl() */
1793 static int snd_seq_ioctl_get_client_pool(struct snd_seq_client *client,
1794 void *arg)
1795 {
1796 struct snd_seq_client_pool *info = arg;
1797 struct snd_seq_client *cptr;
1798
1799 cptr = snd_seq_client_use_ptr(info->client);
1800 if (cptr == NULL)
1801 return -ENOENT;
1802 memset(info, 0, sizeof(*info));
1803 info->client = cptr->number;
1804 info->output_pool = cptr->pool->size;
1805 info->output_room = cptr->pool->room;
1806 info->output_free = info->output_pool;
1807 info->output_free = snd_seq_unused_cells(cptr->pool);
1808 if (cptr->type == USER_CLIENT) {
1809 info->input_pool = cptr->data.user.fifo_pool_size;
1810 info->input_free = info->input_pool;
1811 if (cptr->data.user.fifo)
1812 info->input_free = snd_seq_unused_cells(cptr->data.user.fifo->pool);
1813 } else {
1814 info->input_pool = 0;
1815 info->input_free = 0;
1816 }
1817 snd_seq_client_unlock(cptr);
1818
1819 return 0;
1820 }
1821
1822 /* SET_CLIENT_POOL ioctl() */
1823 static int snd_seq_ioctl_set_client_pool(struct snd_seq_client *client,
1824 void *arg)
1825 {
1826 struct snd_seq_client_pool *info = arg;
1827 int rc;
1828
1829 if (client->number != info->client)
1830 return -EINVAL; /* can't change other clients */
1831
1832 if (info->output_pool >= 1 && info->output_pool <= SNDRV_SEQ_MAX_EVENTS &&
1833 (! snd_seq_write_pool_allocated(client) ||
1834 info->output_pool != client->pool->size)) {
1835 if (snd_seq_write_pool_allocated(client)) {
1836 /* remove all existing cells */
1837 snd_seq_pool_mark_closing(client->pool);
1838 snd_seq_queue_client_leave_cells(client->number);
1839 snd_seq_pool_done(client->pool);
1840 }
1841 client->pool->size = info->output_pool;
1842 rc = snd_seq_pool_init(client->pool);
1843 if (rc < 0)
1844 return rc;
1845 }
1846 if (client->type == USER_CLIENT && client->data.user.fifo != NULL &&
1847 info->input_pool >= 1 &&
1848 info->input_pool <= SNDRV_SEQ_MAX_CLIENT_EVENTS &&
1849 info->input_pool != client->data.user.fifo_pool_size) {
1850 /* change pool size */
1851 rc = snd_seq_fifo_resize(client->data.user.fifo, info->input_pool);
1852 if (rc < 0)
1853 return rc;
1854 client->data.user.fifo_pool_size = info->input_pool;
1855 }
1856 if (info->output_room >= 1 &&
1857 info->output_room <= client->pool->size) {
1858 client->pool->room = info->output_room;
1859 }
1860
1861 return snd_seq_ioctl_get_client_pool(client, arg);
1862 }
1863
1864
1865 /* REMOVE_EVENTS ioctl() */
1866 static int snd_seq_ioctl_remove_events(struct snd_seq_client *client,
1867 void *arg)
1868 {
1869 struct snd_seq_remove_events *info = arg;
1870
1871 /*
1872 * Input mostly not implemented XXX.
1873 */
1874 if (info->remove_mode & SNDRV_SEQ_REMOVE_INPUT) {
1875 /*
1876 * No restrictions so for a user client we can clear
1877 * the whole fifo
1878 */
1879 if (client->type == USER_CLIENT && client->data.user.fifo)
1880 snd_seq_fifo_clear(client->data.user.fifo);
1881 }
1882
1883 if (info->remove_mode & SNDRV_SEQ_REMOVE_OUTPUT)
1884 snd_seq_queue_remove_cells(client->number, info);
1885
1886 return 0;
1887 }
1888
1889
1890 /*
1891 * get subscription info
1892 */
1893 static int snd_seq_ioctl_get_subscription(struct snd_seq_client *client,
1894 void *arg)
1895 {
1896 struct snd_seq_port_subscribe *subs = arg;
1897 int result;
1898 struct snd_seq_client *sender = NULL;
1899 struct snd_seq_client_port *sport = NULL;
1900 struct snd_seq_subscribers *p;
1901
1902 result = -EINVAL;
1903 if ((sender = snd_seq_client_use_ptr(subs->sender.client)) == NULL)
1904 goto __end;
1905 if ((sport = snd_seq_port_use_ptr(sender, subs->sender.port)) == NULL)
1906 goto __end;
1907 p = snd_seq_port_get_subscription(&sport->c_src, &subs->dest);
1908 if (p) {
1909 result = 0;
1910 *subs = p->info;
1911 } else
1912 result = -ENOENT;
1913
1914 __end:
1915 if (sport)
1916 snd_seq_port_unlock(sport);
1917 if (sender)
1918 snd_seq_client_unlock(sender);
1919
1920 return result;
1921 }
1922
1923
1924 /*
1925 * get subscription info - check only its presence
1926 */
1927 static int snd_seq_ioctl_query_subs(struct snd_seq_client *client, void *arg)
1928 {
1929 struct snd_seq_query_subs *subs = arg;
1930 int result = -ENXIO;
1931 struct snd_seq_client *cptr = NULL;
1932 struct snd_seq_client_port *port = NULL;
1933 struct snd_seq_port_subs_info *group;
1934 struct list_head *p;
1935 int i;
1936
1937 if ((cptr = snd_seq_client_use_ptr(subs->root.client)) == NULL)
1938 goto __end;
1939 if ((port = snd_seq_port_use_ptr(cptr, subs->root.port)) == NULL)
1940 goto __end;
1941
1942 switch (subs->type) {
1943 case SNDRV_SEQ_QUERY_SUBS_READ:
1944 group = &port->c_src;
1945 break;
1946 case SNDRV_SEQ_QUERY_SUBS_WRITE:
1947 group = &port->c_dest;
1948 break;
1949 default:
1950 goto __end;
1951 }
1952
1953 down_read(&group->list_mutex);
1954 /* search for the subscriber */
1955 subs->num_subs = group->count;
1956 i = 0;
1957 result = -ENOENT;
1958 list_for_each(p, &group->list_head) {
1959 if (i++ == subs->index) {
1960 /* found! */
1961 struct snd_seq_subscribers *s;
1962 if (subs->type == SNDRV_SEQ_QUERY_SUBS_READ) {
1963 s = list_entry(p, struct snd_seq_subscribers, src_list);
1964 subs->addr = s->info.dest;
1965 } else {
1966 s = list_entry(p, struct snd_seq_subscribers, dest_list);
1967 subs->addr = s->info.sender;
1968 }
1969 subs->flags = s->info.flags;
1970 subs->queue = s->info.queue;
1971 result = 0;
1972 break;
1973 }
1974 }
1975 up_read(&group->list_mutex);
1976
1977 __end:
1978 if (port)
1979 snd_seq_port_unlock(port);
1980 if (cptr)
1981 snd_seq_client_unlock(cptr);
1982
1983 return result;
1984 }
1985
1986
1987 /*
1988 * query next client
1989 */
1990 static int snd_seq_ioctl_query_next_client(struct snd_seq_client *client,
1991 void *arg)
1992 {
1993 struct snd_seq_client_info *info = arg;
1994 struct snd_seq_client *cptr = NULL;
1995
1996 /* search for next client */
1997 info->client++;
1998 if (info->client < 0)
1999 info->client = 0;
2000 for (; info->client < SNDRV_SEQ_MAX_CLIENTS; info->client++) {
2001 cptr = snd_seq_client_use_ptr(info->client);
2002 if (cptr)
2003 break; /* found */
2004 }
2005 if (cptr == NULL)
2006 return -ENOENT;
2007
2008 get_client_info(cptr, info);
2009 snd_seq_client_unlock(cptr);
2010
2011 return 0;
2012 }
2013
2014 /*
2015 * query next port
2016 */
2017 static int snd_seq_ioctl_query_next_port(struct snd_seq_client *client,
2018 void *arg)
2019 {
2020 struct snd_seq_port_info *info = arg;
2021 struct snd_seq_client *cptr;
2022 struct snd_seq_client_port *port = NULL;
2023
2024 cptr = snd_seq_client_use_ptr(info->addr.client);
2025 if (cptr == NULL)
2026 return -ENXIO;
2027
2028 /* search for next port */
2029 info->addr.port++;
2030 port = snd_seq_port_query_nearest(cptr, info);
2031 if (port == NULL) {
2032 snd_seq_client_unlock(cptr);
2033 return -ENOENT;
2034 }
2035
2036 /* get port info */
2037 info->addr = port->addr;
2038 snd_seq_get_port_info(port, info);
2039 snd_seq_port_unlock(port);
2040 snd_seq_client_unlock(cptr);
2041
2042 return 0;
2043 }
2044
2045 /* -------------------------------------------------------- */
2046
2047 static const struct ioctl_handler {
2048 unsigned int cmd;
2049 int (*func)(struct snd_seq_client *client, void *arg);
2050 } ioctl_handlers[] = {
2051 { SNDRV_SEQ_IOCTL_PVERSION, snd_seq_ioctl_pversion },
2052 { SNDRV_SEQ_IOCTL_CLIENT_ID, snd_seq_ioctl_client_id },
2053 { SNDRV_SEQ_IOCTL_SYSTEM_INFO, snd_seq_ioctl_system_info },
2054 { SNDRV_SEQ_IOCTL_RUNNING_MODE, snd_seq_ioctl_running_mode },
2055 { SNDRV_SEQ_IOCTL_GET_CLIENT_INFO, snd_seq_ioctl_get_client_info },
2056 { SNDRV_SEQ_IOCTL_SET_CLIENT_INFO, snd_seq_ioctl_set_client_info },
2057 { SNDRV_SEQ_IOCTL_CREATE_PORT, snd_seq_ioctl_create_port },
2058 { SNDRV_SEQ_IOCTL_DELETE_PORT, snd_seq_ioctl_delete_port },
2059 { SNDRV_SEQ_IOCTL_GET_PORT_INFO, snd_seq_ioctl_get_port_info },
2060 { SNDRV_SEQ_IOCTL_SET_PORT_INFO, snd_seq_ioctl_set_port_info },
2061 { SNDRV_SEQ_IOCTL_SUBSCRIBE_PORT, snd_seq_ioctl_subscribe_port },
2062 { SNDRV_SEQ_IOCTL_UNSUBSCRIBE_PORT, snd_seq_ioctl_unsubscribe_port },
2063 { SNDRV_SEQ_IOCTL_CREATE_QUEUE, snd_seq_ioctl_create_queue },
2064 { SNDRV_SEQ_IOCTL_DELETE_QUEUE, snd_seq_ioctl_delete_queue },
2065 { SNDRV_SEQ_IOCTL_GET_QUEUE_INFO, snd_seq_ioctl_get_queue_info },
2066 { SNDRV_SEQ_IOCTL_SET_QUEUE_INFO, snd_seq_ioctl_set_queue_info },
2067 { SNDRV_SEQ_IOCTL_GET_NAMED_QUEUE, snd_seq_ioctl_get_named_queue },
2068 { SNDRV_SEQ_IOCTL_GET_QUEUE_STATUS, snd_seq_ioctl_get_queue_status },
2069 { SNDRV_SEQ_IOCTL_GET_QUEUE_TEMPO, snd_seq_ioctl_get_queue_tempo },
2070 { SNDRV_SEQ_IOCTL_SET_QUEUE_TEMPO, snd_seq_ioctl_set_queue_tempo },
2071 { SNDRV_SEQ_IOCTL_GET_QUEUE_TIMER, snd_seq_ioctl_get_queue_timer },
2072 { SNDRV_SEQ_IOCTL_SET_QUEUE_TIMER, snd_seq_ioctl_set_queue_timer },
2073 { SNDRV_SEQ_IOCTL_GET_QUEUE_CLIENT, snd_seq_ioctl_get_queue_client },
2074 { SNDRV_SEQ_IOCTL_SET_QUEUE_CLIENT, snd_seq_ioctl_set_queue_client },
2075 { SNDRV_SEQ_IOCTL_GET_CLIENT_POOL, snd_seq_ioctl_get_client_pool },
2076 { SNDRV_SEQ_IOCTL_SET_CLIENT_POOL, snd_seq_ioctl_set_client_pool },
2077 { SNDRV_SEQ_IOCTL_GET_SUBSCRIPTION, snd_seq_ioctl_get_subscription },
2078 { SNDRV_SEQ_IOCTL_QUERY_NEXT_CLIENT, snd_seq_ioctl_query_next_client },
2079 { SNDRV_SEQ_IOCTL_QUERY_NEXT_PORT, snd_seq_ioctl_query_next_port },
2080 { SNDRV_SEQ_IOCTL_REMOVE_EVENTS, snd_seq_ioctl_remove_events },
2081 { SNDRV_SEQ_IOCTL_QUERY_SUBS, snd_seq_ioctl_query_subs },
2082 { 0, NULL },
2083 };
2084
2085 static long snd_seq_ioctl(struct file *file, unsigned int cmd,
2086 unsigned long arg)
2087 {
2088 struct snd_seq_client *client = file->private_data;
2089 /* To use kernel stack for ioctl data. */
2090 union {
2091 int pversion;
2092 int client_id;
2093 struct snd_seq_system_info system_info;
2094 struct snd_seq_running_info running_info;
2095 struct snd_seq_client_info client_info;
2096 struct snd_seq_port_info port_info;
2097 struct snd_seq_port_subscribe port_subscribe;
2098 struct snd_seq_queue_info queue_info;
2099 struct snd_seq_queue_status queue_status;
2100 struct snd_seq_queue_tempo tempo;
2101 struct snd_seq_queue_timer queue_timer;
2102 struct snd_seq_queue_client queue_client;
2103 struct snd_seq_client_pool client_pool;
2104 struct snd_seq_remove_events remove_events;
2105 struct snd_seq_query_subs query_subs;
2106 } buf;
2107 const struct ioctl_handler *handler;
2108 unsigned long size;
2109 int err;
2110
2111 if (snd_BUG_ON(!client))
2112 return -ENXIO;
2113
2114 for (handler = ioctl_handlers; handler->cmd > 0; ++handler) {
2115 if (handler->cmd == cmd)
2116 break;
2117 }
2118 if (handler->cmd == 0)
2119 return -ENOTTY;
2120
2121 memset(&buf, 0, sizeof(buf));
2122
2123 /*
2124 * All of ioctl commands for ALSA sequencer get an argument of size
2125 * within 13 bits. We can safely pick up the size from the command.
2126 */
2127 size = _IOC_SIZE(handler->cmd);
2128 if (handler->cmd & IOC_IN) {
2129 if (copy_from_user(&buf, (const void __user *)arg, size))
2130 return -EFAULT;
2131 }
2132
2133 err = handler->func(client, &buf);
2134 if (err >= 0) {
2135 /* Some commands includes a bug in 'dir' field. */
2136 if (handler->cmd == SNDRV_SEQ_IOCTL_SET_QUEUE_CLIENT ||
2137 handler->cmd == SNDRV_SEQ_IOCTL_SET_CLIENT_POOL ||
2138 (handler->cmd & IOC_OUT))
2139 if (copy_to_user((void __user *)arg, &buf, size))
2140 return -EFAULT;
2141 }
2142
2143 return err;
2144 }
2145
2146 #ifdef CONFIG_COMPAT
2147 #include "seq_compat.c"
2148 #else
2149 #define snd_seq_ioctl_compat NULL
2150 #endif
2151
2152 /* -------------------------------------------------------- */
2153
2154
2155 /* exported to kernel modules */
2156 int snd_seq_create_kernel_client(struct snd_card *card, int client_index,
2157 const char *name_fmt, ...)
2158 {
2159 struct snd_seq_client *client;
2160 va_list args;
2161
2162 if (snd_BUG_ON(in_interrupt()))
2163 return -EBUSY;
2164
2165 if (card && client_index >= SNDRV_SEQ_CLIENTS_PER_CARD)
2166 return -EINVAL;
2167 if (card == NULL && client_index >= SNDRV_SEQ_GLOBAL_CLIENTS)
2168 return -EINVAL;
2169
2170 if (mutex_lock_interruptible(&register_mutex))
2171 return -ERESTARTSYS;
2172
2173 if (card) {
2174 client_index += SNDRV_SEQ_GLOBAL_CLIENTS
2175 + card->number * SNDRV_SEQ_CLIENTS_PER_CARD;
2176 if (client_index >= SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN)
2177 client_index = -1;
2178 }
2179
2180 /* empty write queue as default */
2181 client = seq_create_client1(client_index, 0);
2182 if (client == NULL) {
2183 mutex_unlock(&register_mutex);
2184 return -EBUSY; /* failure code */
2185 }
2186 usage_alloc(&client_usage, 1);
2187
2188 client->accept_input = 1;
2189 client->accept_output = 1;
2190 client->data.kernel.card = card;
2191
2192 va_start(args, name_fmt);
2193 vsnprintf(client->name, sizeof(client->name), name_fmt, args);
2194 va_end(args);
2195
2196 client->type = KERNEL_CLIENT;
2197 mutex_unlock(&register_mutex);
2198
2199 /* make others aware this new client */
2200 snd_seq_system_client_ev_client_start(client->number);
2201
2202 /* return client number to caller */
2203 return client->number;
2204 }
2205 EXPORT_SYMBOL(snd_seq_create_kernel_client);
2206
2207 /* exported to kernel modules */
2208 int snd_seq_delete_kernel_client(int client)
2209 {
2210 struct snd_seq_client *ptr;
2211
2212 if (snd_BUG_ON(in_interrupt()))
2213 return -EBUSY;
2214
2215 ptr = clientptr(client);
2216 if (ptr == NULL)
2217 return -EINVAL;
2218
2219 seq_free_client(ptr);
2220 kfree(ptr);
2221 return 0;
2222 }
2223 EXPORT_SYMBOL(snd_seq_delete_kernel_client);
2224
2225 /* skeleton to enqueue event, called from snd_seq_kernel_client_enqueue
2226 * and snd_seq_kernel_client_enqueue_blocking
2227 */
2228 static int kernel_client_enqueue(int client, struct snd_seq_event *ev,
2229 struct file *file, int blocking,
2230 int atomic, int hop)
2231 {
2232 struct snd_seq_client *cptr;
2233 int result;
2234
2235 if (snd_BUG_ON(!ev))
2236 return -EINVAL;
2237
2238 if (ev->type == SNDRV_SEQ_EVENT_NONE)
2239 return 0; /* ignore this */
2240 if (ev->type == SNDRV_SEQ_EVENT_KERNEL_ERROR)
2241 return -EINVAL; /* quoted events can't be enqueued */
2242
2243 /* fill in client number */
2244 ev->source.client = client;
2245
2246 if (check_event_type_and_length(ev))
2247 return -EINVAL;
2248
2249 cptr = snd_seq_client_use_ptr(client);
2250 if (cptr == NULL)
2251 return -EINVAL;
2252
2253 if (! cptr->accept_output)
2254 result = -EPERM;
2255 else /* send it */
2256 result = snd_seq_client_enqueue_event(cptr, ev, file, blocking, atomic, hop);
2257
2258 snd_seq_client_unlock(cptr);
2259 return result;
2260 }
2261
2262 /*
2263 * exported, called by kernel clients to enqueue events (w/o blocking)
2264 *
2265 * RETURN VALUE: zero if succeed, negative if error
2266 */
2267 int snd_seq_kernel_client_enqueue(int client, struct snd_seq_event * ev,
2268 int atomic, int hop)
2269 {
2270 return kernel_client_enqueue(client, ev, NULL, 0, atomic, hop);
2271 }
2272 EXPORT_SYMBOL(snd_seq_kernel_client_enqueue);
2273
2274 /*
2275 * exported, called by kernel clients to enqueue events (with blocking)
2276 *
2277 * RETURN VALUE: zero if succeed, negative if error
2278 */
2279 int snd_seq_kernel_client_enqueue_blocking(int client, struct snd_seq_event * ev,
2280 struct file *file,
2281 int atomic, int hop)
2282 {
2283 return kernel_client_enqueue(client, ev, file, 1, atomic, hop);
2284 }
2285 EXPORT_SYMBOL(snd_seq_kernel_client_enqueue_blocking);
2286
2287 /*
2288 * exported, called by kernel clients to dispatch events directly to other
2289 * clients, bypassing the queues. Event time-stamp will be updated.
2290 *
2291 * RETURN VALUE: negative = delivery failed,
2292 * zero, or positive: the number of delivered events
2293 */
2294 int snd_seq_kernel_client_dispatch(int client, struct snd_seq_event * ev,
2295 int atomic, int hop)
2296 {
2297 struct snd_seq_client *cptr;
2298 int result;
2299
2300 if (snd_BUG_ON(!ev))
2301 return -EINVAL;
2302
2303 /* fill in client number */
2304 ev->queue = SNDRV_SEQ_QUEUE_DIRECT;
2305 ev->source.client = client;
2306
2307 if (check_event_type_and_length(ev))
2308 return -EINVAL;
2309
2310 cptr = snd_seq_client_use_ptr(client);
2311 if (cptr == NULL)
2312 return -EINVAL;
2313
2314 if (!cptr->accept_output)
2315 result = -EPERM;
2316 else
2317 result = snd_seq_deliver_event(cptr, ev, atomic, hop);
2318
2319 snd_seq_client_unlock(cptr);
2320 return result;
2321 }
2322 EXPORT_SYMBOL(snd_seq_kernel_client_dispatch);
2323
2324 /**
2325 * snd_seq_kernel_client_ctl - operate a command for a client with data in
2326 * kernel space.
2327 * @clientid: A numerical ID for a client.
2328 * @cmd: An ioctl(2) command for ALSA sequencer operation.
2329 * @arg: A pointer to data in kernel space.
2330 *
2331 * Against its name, both kernel/application client can be handled by this
2332 * kernel API. A pointer of 'arg' argument should be in kernel space.
2333 *
2334 * Return: 0 at success. Negative error code at failure.
2335 */
2336 int snd_seq_kernel_client_ctl(int clientid, unsigned int cmd, void *arg)
2337 {
2338 const struct ioctl_handler *handler;
2339 struct snd_seq_client *client;
2340
2341 client = clientptr(clientid);
2342 if (client == NULL)
2343 return -ENXIO;
2344
2345 for (handler = ioctl_handlers; handler->cmd > 0; ++handler) {
2346 if (handler->cmd == cmd)
2347 return handler->func(client, arg);
2348 }
2349
2350 pr_debug("ALSA: seq unknown ioctl() 0x%x (type='%c', number=0x%02x)\n",
2351 cmd, _IOC_TYPE(cmd), _IOC_NR(cmd));
2352 return -ENOTTY;
2353 }
2354 EXPORT_SYMBOL(snd_seq_kernel_client_ctl);
2355
2356 /* exported (for OSS emulator) */
2357 int snd_seq_kernel_client_write_poll(int clientid, struct file *file, poll_table *wait)
2358 {
2359 struct snd_seq_client *client;
2360
2361 client = clientptr(clientid);
2362 if (client == NULL)
2363 return -ENXIO;
2364
2365 if (! snd_seq_write_pool_allocated(client))
2366 return 1;
2367 if (snd_seq_pool_poll_wait(client->pool, file, wait))
2368 return 1;
2369 return 0;
2370 }
2371 EXPORT_SYMBOL(snd_seq_kernel_client_write_poll);
2372
2373 /*---------------------------------------------------------------------------*/
2374
2375 #ifdef CONFIG_SND_PROC_FS
2376 /*
2377 * /proc interface
2378 */
2379 static void snd_seq_info_dump_subscribers(struct snd_info_buffer *buffer,
2380 struct snd_seq_port_subs_info *group,
2381 int is_src, char *msg)
2382 {
2383 struct list_head *p;
2384 struct snd_seq_subscribers *s;
2385 int count = 0;
2386
2387 down_read(&group->list_mutex);
2388 if (list_empty(&group->list_head)) {
2389 up_read(&group->list_mutex);
2390 return;
2391 }
2392 snd_iprintf(buffer, msg);
2393 list_for_each(p, &group->list_head) {
2394 if (is_src)
2395 s = list_entry(p, struct snd_seq_subscribers, src_list);
2396 else
2397 s = list_entry(p, struct snd_seq_subscribers, dest_list);
2398 if (count++)
2399 snd_iprintf(buffer, ", ");
2400 snd_iprintf(buffer, "%d:%d",
2401 is_src ? s->info.dest.client : s->info.sender.client,
2402 is_src ? s->info.dest.port : s->info.sender.port);
2403 if (s->info.flags & SNDRV_SEQ_PORT_SUBS_TIMESTAMP)
2404 snd_iprintf(buffer, "[%c:%d]", ((s->info.flags & SNDRV_SEQ_PORT_SUBS_TIME_REAL) ? 'r' : 't'), s->info.queue);
2405 if (group->exclusive)
2406 snd_iprintf(buffer, "[ex]");
2407 }
2408 up_read(&group->list_mutex);
2409 snd_iprintf(buffer, "\n");
2410 }
2411
2412 #define FLAG_PERM_RD(perm) ((perm) & SNDRV_SEQ_PORT_CAP_READ ? ((perm) & SNDRV_SEQ_PORT_CAP_SUBS_READ ? 'R' : 'r') : '-')
2413 #define FLAG_PERM_WR(perm) ((perm) & SNDRV_SEQ_PORT_CAP_WRITE ? ((perm) & SNDRV_SEQ_PORT_CAP_SUBS_WRITE ? 'W' : 'w') : '-')
2414 #define FLAG_PERM_EX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_NO_EXPORT ? '-' : 'e')
2415
2416 #define FLAG_PERM_DUPLEX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_DUPLEX ? 'X' : '-')
2417
2418 static void snd_seq_info_dump_ports(struct snd_info_buffer *buffer,
2419 struct snd_seq_client *client)
2420 {
2421 struct snd_seq_client_port *p;
2422
2423 mutex_lock(&client->ports_mutex);
2424 list_for_each_entry(p, &client->ports_list_head, list) {
2425 snd_iprintf(buffer, " Port %3d : \"%s\" (%c%c%c%c)\n",
2426 p->addr.port, p->name,
2427 FLAG_PERM_RD(p->capability),
2428 FLAG_PERM_WR(p->capability),
2429 FLAG_PERM_EX(p->capability),
2430 FLAG_PERM_DUPLEX(p->capability));
2431 snd_seq_info_dump_subscribers(buffer, &p->c_src, 1, " Connecting To: ");
2432 snd_seq_info_dump_subscribers(buffer, &p->c_dest, 0, " Connected From: ");
2433 }
2434 mutex_unlock(&client->ports_mutex);
2435 }
2436
2437
2438 /* exported to seq_info.c */
2439 void snd_seq_info_clients_read(struct snd_info_entry *entry,
2440 struct snd_info_buffer *buffer)
2441 {
2442 int c;
2443 struct snd_seq_client *client;
2444
2445 snd_iprintf(buffer, "Client info\n");
2446 snd_iprintf(buffer, " cur clients : %d\n", client_usage.cur);
2447 snd_iprintf(buffer, " peak clients : %d\n", client_usage.peak);
2448 snd_iprintf(buffer, " max clients : %d\n", SNDRV_SEQ_MAX_CLIENTS);
2449 snd_iprintf(buffer, "\n");
2450
2451 /* list the client table */
2452 for (c = 0; c < SNDRV_SEQ_MAX_CLIENTS; c++) {
2453 client = snd_seq_client_use_ptr(c);
2454 if (client == NULL)
2455 continue;
2456 if (client->type == NO_CLIENT) {
2457 snd_seq_client_unlock(client);
2458 continue;
2459 }
2460
2461 snd_iprintf(buffer, "Client %3d : \"%s\" [%s]\n",
2462 c, client->name,
2463 client->type == USER_CLIENT ? "User" : "Kernel");
2464 snd_seq_info_dump_ports(buffer, client);
2465 if (snd_seq_write_pool_allocated(client)) {
2466 snd_iprintf(buffer, " Output pool :\n");
2467 snd_seq_info_pool(buffer, client->pool, " ");
2468 }
2469 if (client->type == USER_CLIENT && client->data.user.fifo &&
2470 client->data.user.fifo->pool) {
2471 snd_iprintf(buffer, " Input pool :\n");
2472 snd_seq_info_pool(buffer, client->data.user.fifo->pool, " ");
2473 }
2474 snd_seq_client_unlock(client);
2475 }
2476 }
2477 #endif /* CONFIG_SND_PROC_FS */
2478
2479 /*---------------------------------------------------------------------------*/
2480
2481
2482 /*
2483 * REGISTRATION PART
2484 */
2485
2486 static const struct file_operations snd_seq_f_ops =
2487 {
2488 .owner = THIS_MODULE,
2489 .read = snd_seq_read,
2490 .write = snd_seq_write,
2491 .open = snd_seq_open,
2492 .release = snd_seq_release,
2493 .llseek = no_llseek,
2494 .poll = snd_seq_poll,
2495 .unlocked_ioctl = snd_seq_ioctl,
2496 .compat_ioctl = snd_seq_ioctl_compat,
2497 };
2498
2499 static struct device seq_dev;
2500
2501 /*
2502 * register sequencer device
2503 */
2504 int __init snd_sequencer_device_init(void)
2505 {
2506 int err;
2507
2508 snd_device_initialize(&seq_dev, NULL);
2509 dev_set_name(&seq_dev, "seq");
2510
2511 if (mutex_lock_interruptible(&register_mutex))
2512 return -ERESTARTSYS;
2513
2514 err = snd_register_device(SNDRV_DEVICE_TYPE_SEQUENCER, NULL, 0,
2515 &snd_seq_f_ops, NULL, &seq_dev);
2516 if (err < 0) {
2517 mutex_unlock(&register_mutex);
2518 put_device(&seq_dev);
2519 return err;
2520 }
2521
2522 mutex_unlock(&register_mutex);
2523
2524 return 0;
2525 }
2526
2527
2528
2529 /*
2530 * unregister sequencer device
2531 */
2532 void __exit snd_sequencer_device_done(void)
2533 {
2534 snd_unregister_device(&seq_dev);
2535 put_device(&seq_dev);
2536 }
CRIS linux kernel tree