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Merge remote-tracking branch 'asoc/fix/dapm' into asoc-linus
[deliverable/linux.git] / sound / core / seq / seq_clientmgr.c
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
91 static inline mm_segment_t snd_enter_user(void)
92 {
93 mm_segment_t fs = get_fs();
94 set_fs(get_ds());
95 return fs;
96 }
97
98 static inline void snd_leave_user(mm_segment_t fs)
99 {
100 set_fs(fs);
101 }
102
103 /*
104 */
105 static inline unsigned short snd_seq_file_flags(struct file *file)
106 {
107 switch (file->f_mode & (FMODE_READ | FMODE_WRITE)) {
108 case FMODE_WRITE:
109 return SNDRV_SEQ_LFLG_OUTPUT;
110 case FMODE_READ:
111 return SNDRV_SEQ_LFLG_INPUT;
112 default:
113 return SNDRV_SEQ_LFLG_OPEN;
114 }
115 }
116
117 static inline int snd_seq_write_pool_allocated(struct snd_seq_client *client)
118 {
119 return snd_seq_total_cells(client->pool) > 0;
120 }
121
122 /* return pointer to client structure for specified id */
123 static struct snd_seq_client *clientptr(int clientid)
124 {
125 if (clientid < 0 || clientid >= SNDRV_SEQ_MAX_CLIENTS) {
126 pr_debug("ALSA: seq: oops. Trying to get pointer to client %d\n",
127 clientid);
128 return NULL;
129 }
130 return clienttab[clientid];
131 }
132
133 struct snd_seq_client *snd_seq_client_use_ptr(int clientid)
134 {
135 unsigned long flags;
136 struct snd_seq_client *client;
137
138 if (clientid < 0 || clientid >= SNDRV_SEQ_MAX_CLIENTS) {
139 pr_debug("ALSA: seq: oops. Trying to get pointer to client %d\n",
140 clientid);
141 return NULL;
142 }
143 spin_lock_irqsave(&clients_lock, flags);
144 client = clientptr(clientid);
145 if (client)
146 goto __lock;
147 if (clienttablock[clientid]) {
148 spin_unlock_irqrestore(&clients_lock, flags);
149 return NULL;
150 }
151 spin_unlock_irqrestore(&clients_lock, flags);
152 #ifdef CONFIG_MODULES
153 if (!in_interrupt()) {
154 static char client_requested[SNDRV_SEQ_GLOBAL_CLIENTS];
155 static char card_requested[SNDRV_CARDS];
156 if (clientid < SNDRV_SEQ_GLOBAL_CLIENTS) {
157 int idx;
158
159 if (!client_requested[clientid]) {
160 client_requested[clientid] = 1;
161 for (idx = 0; idx < 15; idx++) {
162 if (seq_client_load[idx] < 0)
163 break;
164 if (seq_client_load[idx] == clientid) {
165 request_module("snd-seq-client-%i",
166 clientid);
167 break;
168 }
169 }
170 }
171 } else if (clientid < SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN) {
172 int card = (clientid - SNDRV_SEQ_GLOBAL_CLIENTS) /
173 SNDRV_SEQ_CLIENTS_PER_CARD;
174 if (card < snd_ecards_limit) {
175 if (! card_requested[card]) {
176 card_requested[card] = 1;
177 snd_request_card(card);
178 }
179 snd_seq_device_load_drivers();
180 }
181 }
182 spin_lock_irqsave(&clients_lock, flags);
183 client = clientptr(clientid);
184 if (client)
185 goto __lock;
186 spin_unlock_irqrestore(&clients_lock, flags);
187 }
188 #endif
189 return NULL;
190
191 __lock:
192 snd_use_lock_use(&client->use_lock);
193 spin_unlock_irqrestore(&clients_lock, flags);
194 return client;
195 }
196
197 static void usage_alloc(struct snd_seq_usage *res, int num)
198 {
199 res->cur += num;
200 if (res->cur > res->peak)
201 res->peak = res->cur;
202 }
203
204 static void usage_free(struct snd_seq_usage *res, int num)
205 {
206 res->cur -= num;
207 }
208
209 /* initialise data structures */
210 int __init client_init_data(void)
211 {
212 /* zap out the client table */
213 memset(&clienttablock, 0, sizeof(clienttablock));
214 memset(&clienttab, 0, sizeof(clienttab));
215 return 0;
216 }
217
218
219 static struct snd_seq_client *seq_create_client1(int client_index, int poolsize)
220 {
221 unsigned long flags;
222 int c;
223 struct snd_seq_client *client;
224
225 /* init client data */
226 client = kzalloc(sizeof(*client), GFP_KERNEL);
227 if (client == NULL)
228 return NULL;
229 client->pool = snd_seq_pool_new(poolsize);
230 if (client->pool == NULL) {
231 kfree(client);
232 return NULL;
233 }
234 client->type = NO_CLIENT;
235 snd_use_lock_init(&client->use_lock);
236 rwlock_init(&client->ports_lock);
237 mutex_init(&client->ports_mutex);
238 INIT_LIST_HEAD(&client->ports_list_head);
239
240 /* find free slot in the client table */
241 spin_lock_irqsave(&clients_lock, flags);
242 if (client_index < 0) {
243 for (c = SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN;
244 c < SNDRV_SEQ_MAX_CLIENTS;
245 c++) {
246 if (clienttab[c] || clienttablock[c])
247 continue;
248 clienttab[client->number = c] = client;
249 spin_unlock_irqrestore(&clients_lock, flags);
250 return client;
251 }
252 } else {
253 if (clienttab[client_index] == NULL && !clienttablock[client_index]) {
254 clienttab[client->number = client_index] = client;
255 spin_unlock_irqrestore(&clients_lock, flags);
256 return client;
257 }
258 }
259 spin_unlock_irqrestore(&clients_lock, flags);
260 snd_seq_pool_delete(&client->pool);
261 kfree(client);
262 return NULL; /* no free slot found or busy, return failure code */
263 }
264
265
266 static int seq_free_client1(struct snd_seq_client *client)
267 {
268 unsigned long flags;
269
270 if (!client)
271 return 0;
272 snd_seq_delete_all_ports(client);
273 snd_seq_queue_client_leave(client->number);
274 spin_lock_irqsave(&clients_lock, flags);
275 clienttablock[client->number] = 1;
276 clienttab[client->number] = NULL;
277 spin_unlock_irqrestore(&clients_lock, flags);
278 snd_use_lock_sync(&client->use_lock);
279 snd_seq_queue_client_termination(client->number);
280 if (client->pool)
281 snd_seq_pool_delete(&client->pool);
282 spin_lock_irqsave(&clients_lock, flags);
283 clienttablock[client->number] = 0;
284 spin_unlock_irqrestore(&clients_lock, flags);
285 return 0;
286 }
287
288
289 static void seq_free_client(struct snd_seq_client * client)
290 {
291 mutex_lock(&register_mutex);
292 switch (client->type) {
293 case NO_CLIENT:
294 pr_warn("ALSA: seq: Trying to free unused client %d\n",
295 client->number);
296 break;
297 case USER_CLIENT:
298 case KERNEL_CLIENT:
299 seq_free_client1(client);
300 usage_free(&client_usage, 1);
301 break;
302
303 default:
304 pr_err("ALSA: seq: Trying to free client %d with undefined type = %d\n",
305 client->number, client->type);
306 }
307 mutex_unlock(&register_mutex);
308
309 snd_seq_system_client_ev_client_exit(client->number);
310 }
311
312
313
314 /* -------------------------------------------------------- */
315
316 /* create a user client */
317 static int snd_seq_open(struct inode *inode, struct file *file)
318 {
319 int c, mode; /* client id */
320 struct snd_seq_client *client;
321 struct snd_seq_user_client *user;
322 int err;
323
324 err = nonseekable_open(inode, file);
325 if (err < 0)
326 return err;
327
328 if (mutex_lock_interruptible(&register_mutex))
329 return -ERESTARTSYS;
330 client = seq_create_client1(-1, SNDRV_SEQ_DEFAULT_EVENTS);
331 if (client == NULL) {
332 mutex_unlock(&register_mutex);
333 return -ENOMEM; /* failure code */
334 }
335
336 mode = snd_seq_file_flags(file);
337 if (mode & SNDRV_SEQ_LFLG_INPUT)
338 client->accept_input = 1;
339 if (mode & SNDRV_SEQ_LFLG_OUTPUT)
340 client->accept_output = 1;
341
342 user = &client->data.user;
343 user->fifo = NULL;
344 user->fifo_pool_size = 0;
345
346 if (mode & SNDRV_SEQ_LFLG_INPUT) {
347 user->fifo_pool_size = SNDRV_SEQ_DEFAULT_CLIENT_EVENTS;
348 user->fifo = snd_seq_fifo_new(user->fifo_pool_size);
349 if (user->fifo == NULL) {
350 seq_free_client1(client);
351 kfree(client);
352 mutex_unlock(&register_mutex);
353 return -ENOMEM;
354 }
355 }
356
357 usage_alloc(&client_usage, 1);
358 client->type = USER_CLIENT;
359 mutex_unlock(&register_mutex);
360
361 c = client->number;
362 file->private_data = client;
363
364 /* fill client data */
365 user->file = file;
366 sprintf(client->name, "Client-%d", c);
367
368 /* make others aware this new client */
369 snd_seq_system_client_ev_client_start(c);
370
371 return 0;
372 }
373
374 /* delete a user client */
375 static int snd_seq_release(struct inode *inode, struct file *file)
376 {
377 struct snd_seq_client *client = file->private_data;
378
379 if (client) {
380 seq_free_client(client);
381 if (client->data.user.fifo)
382 snd_seq_fifo_delete(&client->data.user.fifo);
383 kfree(client);
384 }
385
386 return 0;
387 }
388
389
390 /* handle client read() */
391 /* possible error values:
392 * -ENXIO invalid client or file open mode
393 * -ENOSPC FIFO overflow (the flag is cleared after this error report)
394 * -EINVAL no enough user-space buffer to write the whole event
395 * -EFAULT seg. fault during copy to user space
396 */
397 static ssize_t snd_seq_read(struct file *file, char __user *buf, size_t count,
398 loff_t *offset)
399 {
400 struct snd_seq_client *client = file->private_data;
401 struct snd_seq_fifo *fifo;
402 int err;
403 long result = 0;
404 struct snd_seq_event_cell *cell;
405
406 if (!(snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_INPUT))
407 return -ENXIO;
408
409 if (!access_ok(VERIFY_WRITE, buf, count))
410 return -EFAULT;
411
412 /* check client structures are in place */
413 if (snd_BUG_ON(!client))
414 return -ENXIO;
415
416 if (!client->accept_input || (fifo = client->data.user.fifo) == NULL)
417 return -ENXIO;
418
419 if (atomic_read(&fifo->overflow) > 0) {
420 /* buffer overflow is detected */
421 snd_seq_fifo_clear(fifo);
422 /* return error code */
423 return -ENOSPC;
424 }
425
426 cell = NULL;
427 err = 0;
428 snd_seq_fifo_lock(fifo);
429
430 /* while data available in queue */
431 while (count >= sizeof(struct snd_seq_event)) {
432 int nonblock;
433
434 nonblock = (file->f_flags & O_NONBLOCK) || result > 0;
435 if ((err = snd_seq_fifo_cell_out(fifo, &cell, nonblock)) < 0) {
436 break;
437 }
438 if (snd_seq_ev_is_variable(&cell->event)) {
439 struct snd_seq_event tmpev;
440 tmpev = cell->event;
441 tmpev.data.ext.len &= ~SNDRV_SEQ_EXT_MASK;
442 if (copy_to_user(buf, &tmpev, sizeof(struct snd_seq_event))) {
443 err = -EFAULT;
444 break;
445 }
446 count -= sizeof(struct snd_seq_event);
447 buf += sizeof(struct snd_seq_event);
448 err = snd_seq_expand_var_event(&cell->event, count,
449 (char __force *)buf, 0,
450 sizeof(struct snd_seq_event));
451 if (err < 0)
452 break;
453 result += err;
454 count -= err;
455 buf += err;
456 } else {
457 if (copy_to_user(buf, &cell->event, sizeof(struct snd_seq_event))) {
458 err = -EFAULT;
459 break;
460 }
461 count -= sizeof(struct snd_seq_event);
462 buf += sizeof(struct snd_seq_event);
463 }
464 snd_seq_cell_free(cell);
465 cell = NULL; /* to be sure */
466 result += sizeof(struct snd_seq_event);
467 }
468
469 if (err < 0) {
470 if (cell)
471 snd_seq_fifo_cell_putback(fifo, cell);
472 if (err == -EAGAIN && result > 0)
473 err = 0;
474 }
475 snd_seq_fifo_unlock(fifo);
476
477 return (err < 0) ? err : result;
478 }
479
480
481 /*
482 * check access permission to the port
483 */
484 static int check_port_perm(struct snd_seq_client_port *port, unsigned int flags)
485 {
486 if ((port->capability & flags) != flags)
487 return 0;
488 return flags;
489 }
490
491 /*
492 * check if the destination client is available, and return the pointer
493 * if filter is non-zero, client filter bitmap is tested.
494 */
495 static struct snd_seq_client *get_event_dest_client(struct snd_seq_event *event,
496 int filter)
497 {
498 struct snd_seq_client *dest;
499
500 dest = snd_seq_client_use_ptr(event->dest.client);
501 if (dest == NULL)
502 return NULL;
503 if (! dest->accept_input)
504 goto __not_avail;
505 if ((dest->filter & SNDRV_SEQ_FILTER_USE_EVENT) &&
506 ! test_bit(event->type, dest->event_filter))
507 goto __not_avail;
508 if (filter && !(dest->filter & filter))
509 goto __not_avail;
510
511 return dest; /* ok - accessible */
512 __not_avail:
513 snd_seq_client_unlock(dest);
514 return NULL;
515 }
516
517
518 /*
519 * Return the error event.
520 *
521 * If the receiver client is a user client, the original event is
522 * encapsulated in SNDRV_SEQ_EVENT_BOUNCE as variable length event. If
523 * the original event is also variable length, the external data is
524 * copied after the event record.
525 * If the receiver client is a kernel client, the original event is
526 * quoted in SNDRV_SEQ_EVENT_KERNEL_ERROR, since this requires no extra
527 * kmalloc.
528 */
529 static int bounce_error_event(struct snd_seq_client *client,
530 struct snd_seq_event *event,
531 int err, int atomic, int hop)
532 {
533 struct snd_seq_event bounce_ev;
534 int result;
535
536 if (client == NULL ||
537 ! (client->filter & SNDRV_SEQ_FILTER_BOUNCE) ||
538 ! client->accept_input)
539 return 0; /* ignored */
540
541 /* set up quoted error */
542 memset(&bounce_ev, 0, sizeof(bounce_ev));
543 bounce_ev.type = SNDRV_SEQ_EVENT_KERNEL_ERROR;
544 bounce_ev.flags = SNDRV_SEQ_EVENT_LENGTH_FIXED;
545 bounce_ev.queue = SNDRV_SEQ_QUEUE_DIRECT;
546 bounce_ev.source.client = SNDRV_SEQ_CLIENT_SYSTEM;
547 bounce_ev.source.port = SNDRV_SEQ_PORT_SYSTEM_ANNOUNCE;
548 bounce_ev.dest.client = client->number;
549 bounce_ev.dest.port = event->source.port;
550 bounce_ev.data.quote.origin = event->dest;
551 bounce_ev.data.quote.event = event;
552 bounce_ev.data.quote.value = -err; /* use positive value */
553 result = snd_seq_deliver_single_event(NULL, &bounce_ev, 0, atomic, hop + 1);
554 if (result < 0) {
555 client->event_lost++;
556 return result;
557 }
558
559 return result;
560 }
561
562
563 /*
564 * rewrite the time-stamp of the event record with the curren time
565 * of the given queue.
566 * return non-zero if updated.
567 */
568 static int update_timestamp_of_queue(struct snd_seq_event *event,
569 int queue, int real_time)
570 {
571 struct snd_seq_queue *q;
572
573 q = queueptr(queue);
574 if (! q)
575 return 0;
576 event->queue = queue;
577 event->flags &= ~SNDRV_SEQ_TIME_STAMP_MASK;
578 if (real_time) {
579 event->time.time = snd_seq_timer_get_cur_time(q->timer);
580 event->flags |= SNDRV_SEQ_TIME_STAMP_REAL;
581 } else {
582 event->time.tick = snd_seq_timer_get_cur_tick(q->timer);
583 event->flags |= SNDRV_SEQ_TIME_STAMP_TICK;
584 }
585 queuefree(q);
586 return 1;
587 }
588
589
590 /*
591 * deliver an event to the specified destination.
592 * if filter is non-zero, client filter bitmap is tested.
593 *
594 * RETURN VALUE: 0 : if succeeded
595 * <0 : error
596 */
597 static int snd_seq_deliver_single_event(struct snd_seq_client *client,
598 struct snd_seq_event *event,
599 int filter, int atomic, int hop)
600 {
601 struct snd_seq_client *dest = NULL;
602 struct snd_seq_client_port *dest_port = NULL;
603 int result = -ENOENT;
604 int direct;
605
606 direct = snd_seq_ev_is_direct(event);
607
608 dest = get_event_dest_client(event, filter);
609 if (dest == NULL)
610 goto __skip;
611 dest_port = snd_seq_port_use_ptr(dest, event->dest.port);
612 if (dest_port == NULL)
613 goto __skip;
614
615 /* check permission */
616 if (! check_port_perm(dest_port, SNDRV_SEQ_PORT_CAP_WRITE)) {
617 result = -EPERM;
618 goto __skip;
619 }
620
621 if (dest_port->timestamping)
622 update_timestamp_of_queue(event, dest_port->time_queue,
623 dest_port->time_real);
624
625 switch (dest->type) {
626 case USER_CLIENT:
627 if (dest->data.user.fifo)
628 result = snd_seq_fifo_event_in(dest->data.user.fifo, event);
629 break;
630
631 case KERNEL_CLIENT:
632 if (dest_port->event_input == NULL)
633 break;
634 result = dest_port->event_input(event, direct,
635 dest_port->private_data,
636 atomic, hop);
637 break;
638 default:
639 break;
640 }
641
642 __skip:
643 if (dest_port)
644 snd_seq_port_unlock(dest_port);
645 if (dest)
646 snd_seq_client_unlock(dest);
647
648 if (result < 0 && !direct) {
649 result = bounce_error_event(client, event, result, atomic, hop);
650 }
651 return result;
652 }
653
654
655 /*
656 * send the event to all subscribers:
657 */
658 static int deliver_to_subscribers(struct snd_seq_client *client,
659 struct snd_seq_event *event,
660 int atomic, int hop)
661 {
662 struct snd_seq_subscribers *subs;
663 int err, result = 0, num_ev = 0;
664 struct snd_seq_event event_saved;
665 struct snd_seq_client_port *src_port;
666 struct snd_seq_port_subs_info *grp;
667
668 src_port = snd_seq_port_use_ptr(client, event->source.port);
669 if (src_port == NULL)
670 return -EINVAL; /* invalid source port */
671 /* save original event record */
672 event_saved = *event;
673 grp = &src_port->c_src;
674
675 /* lock list */
676 if (atomic)
677 read_lock(&grp->list_lock);
678 else
679 down_read(&grp->list_mutex);
680 list_for_each_entry(subs, &grp->list_head, src_list) {
681 event->dest = subs->info.dest;
682 if (subs->info.flags & SNDRV_SEQ_PORT_SUBS_TIMESTAMP)
683 /* convert time according to flag with subscription */
684 update_timestamp_of_queue(event, subs->info.queue,
685 subs->info.flags & SNDRV_SEQ_PORT_SUBS_TIME_REAL);
686 err = snd_seq_deliver_single_event(client, event,
687 0, atomic, hop);
688 if (err < 0) {
689 /* save first error that occurs and continue */
690 if (!result)
691 result = err;
692 continue;
693 }
694 num_ev++;
695 /* restore original event record */
696 *event = event_saved;
697 }
698 if (atomic)
699 read_unlock(&grp->list_lock);
700 else
701 up_read(&grp->list_mutex);
702 *event = event_saved; /* restore */
703 snd_seq_port_unlock(src_port);
704 return (result < 0) ? result : num_ev;
705 }
706
707
708 #ifdef SUPPORT_BROADCAST
709 /*
710 * broadcast to all ports:
711 */
712 static int port_broadcast_event(struct snd_seq_client *client,
713 struct snd_seq_event *event,
714 int atomic, int hop)
715 {
716 int num_ev = 0, err, result = 0;
717 struct snd_seq_client *dest_client;
718 struct snd_seq_client_port *port;
719
720 dest_client = get_event_dest_client(event, SNDRV_SEQ_FILTER_BROADCAST);
721 if (dest_client == NULL)
722 return 0; /* no matching destination */
723
724 read_lock(&dest_client->ports_lock);
725 list_for_each_entry(port, &dest_client->ports_list_head, list) {
726 event->dest.port = port->addr.port;
727 /* pass NULL as source client to avoid error bounce */
728 err = snd_seq_deliver_single_event(NULL, event,
729 SNDRV_SEQ_FILTER_BROADCAST,
730 atomic, hop);
731 if (err < 0) {
732 /* save first error that occurs and continue */
733 if (!result)
734 result = err;
735 continue;
736 }
737 num_ev++;
738 }
739 read_unlock(&dest_client->ports_lock);
740 snd_seq_client_unlock(dest_client);
741 event->dest.port = SNDRV_SEQ_ADDRESS_BROADCAST; /* restore */
742 return (result < 0) ? result : num_ev;
743 }
744
745 /*
746 * send the event to all clients:
747 * if destination port is also ADDRESS_BROADCAST, deliver to all ports.
748 */
749 static int broadcast_event(struct snd_seq_client *client,
750 struct snd_seq_event *event, int atomic, int hop)
751 {
752 int err, result = 0, num_ev = 0;
753 int dest;
754 struct snd_seq_addr addr;
755
756 addr = event->dest; /* save */
757
758 for (dest = 0; dest < SNDRV_SEQ_MAX_CLIENTS; dest++) {
759 /* don't send to itself */
760 if (dest == client->number)
761 continue;
762 event->dest.client = dest;
763 event->dest.port = addr.port;
764 if (addr.port == SNDRV_SEQ_ADDRESS_BROADCAST)
765 err = port_broadcast_event(client, event, atomic, hop);
766 else
767 /* pass NULL as source client to avoid error bounce */
768 err = snd_seq_deliver_single_event(NULL, event,
769 SNDRV_SEQ_FILTER_BROADCAST,
770 atomic, hop);
771 if (err < 0) {
772 /* save first error that occurs and continue */
773 if (!result)
774 result = err;
775 continue;
776 }
777 num_ev += err;
778 }
779 event->dest = addr; /* restore */
780 return (result < 0) ? result : num_ev;
781 }
782
783
784 /* multicast - not supported yet */
785 static int multicast_event(struct snd_seq_client *client, struct snd_seq_event *event,
786 int atomic, int hop)
787 {
788 pr_debug("ALSA: seq: multicast not supported yet.\n");
789 return 0; /* ignored */
790 }
791 #endif /* SUPPORT_BROADCAST */
792
793
794 /* deliver an event to the destination port(s).
795 * if the event is to subscribers or broadcast, the event is dispatched
796 * to multiple targets.
797 *
798 * RETURN VALUE: n > 0 : the number of delivered events.
799 * n == 0 : the event was not passed to any client.
800 * n < 0 : error - event was not processed.
801 */
802 static int snd_seq_deliver_event(struct snd_seq_client *client, struct snd_seq_event *event,
803 int atomic, int hop)
804 {
805 int result;
806
807 hop++;
808 if (hop >= SNDRV_SEQ_MAX_HOPS) {
809 pr_debug("ALSA: seq: too long delivery path (%d:%d->%d:%d)\n",
810 event->source.client, event->source.port,
811 event->dest.client, event->dest.port);
812 return -EMLINK;
813 }
814
815 if (event->queue == SNDRV_SEQ_ADDRESS_SUBSCRIBERS ||
816 event->dest.client == SNDRV_SEQ_ADDRESS_SUBSCRIBERS)
817 result = deliver_to_subscribers(client, event, atomic, hop);
818 #ifdef SUPPORT_BROADCAST
819 else if (event->queue == SNDRV_SEQ_ADDRESS_BROADCAST ||
820 event->dest.client == SNDRV_SEQ_ADDRESS_BROADCAST)
821 result = broadcast_event(client, event, atomic, hop);
822 else if (event->dest.client >= SNDRV_SEQ_MAX_CLIENTS)
823 result = multicast_event(client, event, atomic, hop);
824 else if (event->dest.port == SNDRV_SEQ_ADDRESS_BROADCAST)
825 result = port_broadcast_event(client, event, atomic, hop);
826 #endif
827 else
828 result = snd_seq_deliver_single_event(client, event, 0, atomic, hop);
829
830 return result;
831 }
832
833 /*
834 * dispatch an event cell:
835 * This function is called only from queue check routines in timer
836 * interrupts or after enqueued.
837 * The event cell shall be released or re-queued in this function.
838 *
839 * RETURN VALUE: n > 0 : the number of delivered events.
840 * n == 0 : the event was not passed to any client.
841 * n < 0 : error - event was not processed.
842 */
843 int snd_seq_dispatch_event(struct snd_seq_event_cell *cell, int atomic, int hop)
844 {
845 struct snd_seq_client *client;
846 int result;
847
848 if (snd_BUG_ON(!cell))
849 return -EINVAL;
850
851 client = snd_seq_client_use_ptr(cell->event.source.client);
852 if (client == NULL) {
853 snd_seq_cell_free(cell); /* release this cell */
854 return -EINVAL;
855 }
856
857 if (cell->event.type == SNDRV_SEQ_EVENT_NOTE) {
858 /* NOTE event:
859 * the event cell is re-used as a NOTE-OFF event and
860 * enqueued again.
861 */
862 struct snd_seq_event tmpev, *ev;
863
864 /* reserve this event to enqueue note-off later */
865 tmpev = cell->event;
866 tmpev.type = SNDRV_SEQ_EVENT_NOTEON;
867 result = snd_seq_deliver_event(client, &tmpev, atomic, hop);
868
869 /*
870 * This was originally a note event. We now re-use the
871 * cell for the note-off event.
872 */
873
874 ev = &cell->event;
875 ev->type = SNDRV_SEQ_EVENT_NOTEOFF;
876 ev->flags |= SNDRV_SEQ_PRIORITY_HIGH;
877
878 /* add the duration time */
879 switch (ev->flags & SNDRV_SEQ_TIME_STAMP_MASK) {
880 case SNDRV_SEQ_TIME_STAMP_TICK:
881 ev->time.tick += ev->data.note.duration;
882 break;
883 case SNDRV_SEQ_TIME_STAMP_REAL:
884 /* unit for duration is ms */
885 ev->time.time.tv_nsec += 1000000 * (ev->data.note.duration % 1000);
886 ev->time.time.tv_sec += ev->data.note.duration / 1000 +
887 ev->time.time.tv_nsec / 1000000000;
888 ev->time.time.tv_nsec %= 1000000000;
889 break;
890 }
891 ev->data.note.velocity = ev->data.note.off_velocity;
892
893 /* Now queue this cell as the note off event */
894 if (snd_seq_enqueue_event(cell, atomic, hop) < 0)
895 snd_seq_cell_free(cell); /* release this cell */
896
897 } else {
898 /* Normal events:
899 * event cell is freed after processing the event
900 */
901
902 result = snd_seq_deliver_event(client, &cell->event, atomic, hop);
903 snd_seq_cell_free(cell);
904 }
905
906 snd_seq_client_unlock(client);
907 return result;
908 }
909
910
911 /* Allocate a cell from client pool and enqueue it to queue:
912 * if pool is empty and blocking is TRUE, sleep until a new cell is
913 * available.
914 */
915 static int snd_seq_client_enqueue_event(struct snd_seq_client *client,
916 struct snd_seq_event *event,
917 struct file *file, int blocking,
918 int atomic, int hop)
919 {
920 struct snd_seq_event_cell *cell;
921 int err;
922
923 /* special queue values - force direct passing */
924 if (event->queue == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) {
925 event->dest.client = SNDRV_SEQ_ADDRESS_SUBSCRIBERS;
926 event->queue = SNDRV_SEQ_QUEUE_DIRECT;
927 } else
928 #ifdef SUPPORT_BROADCAST
929 if (event->queue == SNDRV_SEQ_ADDRESS_BROADCAST) {
930 event->dest.client = SNDRV_SEQ_ADDRESS_BROADCAST;
931 event->queue = SNDRV_SEQ_QUEUE_DIRECT;
932 }
933 #endif
934 if (event->dest.client == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) {
935 /* check presence of source port */
936 struct snd_seq_client_port *src_port = snd_seq_port_use_ptr(client, event->source.port);
937 if (src_port == NULL)
938 return -EINVAL;
939 snd_seq_port_unlock(src_port);
940 }
941
942 /* direct event processing without enqueued */
943 if (snd_seq_ev_is_direct(event)) {
944 if (event->type == SNDRV_SEQ_EVENT_NOTE)
945 return -EINVAL; /* this event must be enqueued! */
946 return snd_seq_deliver_event(client, event, atomic, hop);
947 }
948
949 /* Not direct, normal queuing */
950 if (snd_seq_queue_is_used(event->queue, client->number) <= 0)
951 return -EINVAL; /* invalid queue */
952 if (! snd_seq_write_pool_allocated(client))
953 return -ENXIO; /* queue is not allocated */
954
955 /* allocate an event cell */
956 err = snd_seq_event_dup(client->pool, event, &cell, !blocking || atomic, file);
957 if (err < 0)
958 return err;
959
960 /* we got a cell. enqueue it. */
961 if ((err = snd_seq_enqueue_event(cell, atomic, hop)) < 0) {
962 snd_seq_cell_free(cell);
963 return err;
964 }
965
966 return 0;
967 }
968
969
970 /*
971 * check validity of event type and data length.
972 * return non-zero if invalid.
973 */
974 static int check_event_type_and_length(struct snd_seq_event *ev)
975 {
976 switch (snd_seq_ev_length_type(ev)) {
977 case SNDRV_SEQ_EVENT_LENGTH_FIXED:
978 if (snd_seq_ev_is_variable_type(ev))
979 return -EINVAL;
980 break;
981 case SNDRV_SEQ_EVENT_LENGTH_VARIABLE:
982 if (! snd_seq_ev_is_variable_type(ev) ||
983 (ev->data.ext.len & ~SNDRV_SEQ_EXT_MASK) >= SNDRV_SEQ_MAX_EVENT_LEN)
984 return -EINVAL;
985 break;
986 case SNDRV_SEQ_EVENT_LENGTH_VARUSR:
987 if (! snd_seq_ev_is_direct(ev))
988 return -EINVAL;
989 break;
990 }
991 return 0;
992 }
993
994
995 /* handle write() */
996 /* possible error values:
997 * -ENXIO invalid client or file open mode
998 * -ENOMEM malloc failed
999 * -EFAULT seg. fault during copy from user space
1000 * -EINVAL invalid event
1001 * -EAGAIN no space in output pool
1002 * -EINTR interrupts while sleep
1003 * -EMLINK too many hops
1004 * others depends on return value from driver callback
1005 */
1006 static ssize_t snd_seq_write(struct file *file, const char __user *buf,
1007 size_t count, loff_t *offset)
1008 {
1009 struct snd_seq_client *client = file->private_data;
1010 int written = 0, len;
1011 int err = -EINVAL;
1012 struct snd_seq_event event;
1013
1014 if (!(snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT))
1015 return -ENXIO;
1016
1017 /* check client structures are in place */
1018 if (snd_BUG_ON(!client))
1019 return -ENXIO;
1020
1021 if (!client->accept_output || client->pool == NULL)
1022 return -ENXIO;
1023
1024 /* allocate the pool now if the pool is not allocated yet */
1025 if (client->pool->size > 0 && !snd_seq_write_pool_allocated(client)) {
1026 if (snd_seq_pool_init(client->pool) < 0)
1027 return -ENOMEM;
1028 }
1029
1030 /* only process whole events */
1031 while (count >= sizeof(struct snd_seq_event)) {
1032 /* Read in the event header from the user */
1033 len = sizeof(event);
1034 if (copy_from_user(&event, buf, len)) {
1035 err = -EFAULT;
1036 break;
1037 }
1038 event.source.client = client->number; /* fill in client number */
1039 /* Check for extension data length */
1040 if (check_event_type_and_length(&event)) {
1041 err = -EINVAL;
1042 break;
1043 }
1044
1045 /* check for special events */
1046 if (event.type == SNDRV_SEQ_EVENT_NONE)
1047 goto __skip_event;
1048 else if (snd_seq_ev_is_reserved(&event)) {
1049 err = -EINVAL;
1050 break;
1051 }
1052
1053 if (snd_seq_ev_is_variable(&event)) {
1054 int extlen = event.data.ext.len & ~SNDRV_SEQ_EXT_MASK;
1055 if ((size_t)(extlen + len) > count) {
1056 /* back out, will get an error this time or next */
1057 err = -EINVAL;
1058 break;
1059 }
1060 /* set user space pointer */
1061 event.data.ext.len = extlen | SNDRV_SEQ_EXT_USRPTR;
1062 event.data.ext.ptr = (char __force *)buf
1063 + sizeof(struct snd_seq_event);
1064 len += extlen; /* increment data length */
1065 } else {
1066 #ifdef CONFIG_COMPAT
1067 if (client->convert32 && snd_seq_ev_is_varusr(&event)) {
1068 void *ptr = (void __force *)compat_ptr(event.data.raw32.d[1]);
1069 event.data.ext.ptr = ptr;
1070 }
1071 #endif
1072 }
1073
1074 /* ok, enqueue it */
1075 err = snd_seq_client_enqueue_event(client, &event, file,
1076 !(file->f_flags & O_NONBLOCK),
1077 0, 0);
1078 if (err < 0)
1079 break;
1080
1081 __skip_event:
1082 /* Update pointers and counts */
1083 count -= len;
1084 buf += len;
1085 written += len;
1086 }
1087
1088 return written ? written : err;
1089 }
1090
1091
1092 /*
1093 * handle polling
1094 */
1095 static unsigned int snd_seq_poll(struct file *file, poll_table * wait)
1096 {
1097 struct snd_seq_client *client = file->private_data;
1098 unsigned int mask = 0;
1099
1100 /* check client structures are in place */
1101 if (snd_BUG_ON(!client))
1102 return -ENXIO;
1103
1104 if ((snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_INPUT) &&
1105 client->data.user.fifo) {
1106
1107 /* check if data is available in the outqueue */
1108 if (snd_seq_fifo_poll_wait(client->data.user.fifo, file, wait))
1109 mask |= POLLIN | POLLRDNORM;
1110 }
1111
1112 if (snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT) {
1113
1114 /* check if data is available in the pool */
1115 if (!snd_seq_write_pool_allocated(client) ||
1116 snd_seq_pool_poll_wait(client->pool, file, wait))
1117 mask |= POLLOUT | POLLWRNORM;
1118 }
1119
1120 return mask;
1121 }
1122
1123
1124 /*-----------------------------------------------------*/
1125
1126
1127 /* SYSTEM_INFO ioctl() */
1128 static int snd_seq_ioctl_system_info(struct snd_seq_client *client, void __user *arg)
1129 {
1130 struct snd_seq_system_info info;
1131
1132 memset(&info, 0, sizeof(info));
1133 /* fill the info fields */
1134 info.queues = SNDRV_SEQ_MAX_QUEUES;
1135 info.clients = SNDRV_SEQ_MAX_CLIENTS;
1136 info.ports = SNDRV_SEQ_MAX_PORTS;
1137 info.channels = 256; /* fixed limit */
1138 info.cur_clients = client_usage.cur;
1139 info.cur_queues = snd_seq_queue_get_cur_queues();
1140
1141 if (copy_to_user(arg, &info, sizeof(info)))
1142 return -EFAULT;
1143 return 0;
1144 }
1145
1146
1147 /* RUNNING_MODE ioctl() */
1148 static int snd_seq_ioctl_running_mode(struct snd_seq_client *client, void __user *arg)
1149 {
1150 struct snd_seq_running_info info;
1151 struct snd_seq_client *cptr;
1152 int err = 0;
1153
1154 if (copy_from_user(&info, arg, sizeof(info)))
1155 return -EFAULT;
1156
1157 /* requested client number */
1158 cptr = snd_seq_client_use_ptr(info.client);
1159 if (cptr == NULL)
1160 return -ENOENT; /* don't change !!! */
1161
1162 #ifdef SNDRV_BIG_ENDIAN
1163 if (! info.big_endian) {
1164 err = -EINVAL;
1165 goto __err;
1166 }
1167 #else
1168 if (info.big_endian) {
1169 err = -EINVAL;
1170 goto __err;
1171 }
1172
1173 #endif
1174 if (info.cpu_mode > sizeof(long)) {
1175 err = -EINVAL;
1176 goto __err;
1177 }
1178 cptr->convert32 = (info.cpu_mode < sizeof(long));
1179 __err:
1180 snd_seq_client_unlock(cptr);
1181 return err;
1182 }
1183
1184 /* CLIENT_INFO ioctl() */
1185 static void get_client_info(struct snd_seq_client *cptr,
1186 struct snd_seq_client_info *info)
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;
1197 memset(info->reserved, 0, sizeof(info->reserved));
1198 }
1199
1200 static int snd_seq_ioctl_get_client_info(struct snd_seq_client *client,
1201 void __user *arg)
1202 {
1203 struct snd_seq_client *cptr;
1204 struct snd_seq_client_info client_info;
1205
1206 if (copy_from_user(&client_info, arg, sizeof(client_info)))
1207 return -EFAULT;
1208
1209 /* requested client number */
1210 cptr = snd_seq_client_use_ptr(client_info.client);
1211 if (cptr == NULL)
1212 return -ENOENT; /* don't change !!! */
1213
1214 get_client_info(cptr, &client_info);
1215 snd_seq_client_unlock(cptr);
1216
1217 if (copy_to_user(arg, &client_info, sizeof(client_info)))
1218 return -EFAULT;
1219 return 0;
1220 }
1221
1222
1223 /* CLIENT_INFO ioctl() */
1224 static int snd_seq_ioctl_set_client_info(struct snd_seq_client *client,
1225 void __user *arg)
1226 {
1227 struct snd_seq_client_info client_info;
1228
1229 if (copy_from_user(&client_info, arg, sizeof(client_info)))
1230 return -EFAULT;
1231
1232 /* it is not allowed to set the info fields for an another client */
1233 if (client->number != client_info.client)
1234 return -EPERM;
1235 /* also client type must be set now */
1236 if (client->type != client_info.type)
1237 return -EINVAL;
1238
1239 /* fill the info fields */
1240 if (client_info.name[0])
1241 strlcpy(client->name, client_info.name, sizeof(client->name));
1242
1243 client->filter = client_info.filter;
1244 client->event_lost = client_info.event_lost;
1245 memcpy(client->event_filter, client_info.event_filter, 32);
1246
1247 return 0;
1248 }
1249
1250
1251 /*
1252 * CREATE PORT ioctl()
1253 */
1254 static int snd_seq_ioctl_create_port(struct snd_seq_client *client,
1255 void __user *arg)
1256 {
1257 struct snd_seq_client_port *port;
1258 struct snd_seq_port_info info;
1259 struct snd_seq_port_callback *callback;
1260
1261 if (copy_from_user(&info, arg, sizeof(info)))
1262 return -EFAULT;
1263
1264 /* it is not allowed to create the port for an another client */
1265 if (info.addr.client != client->number)
1266 return -EPERM;
1267
1268 port = snd_seq_create_port(client, (info.flags & SNDRV_SEQ_PORT_FLG_GIVEN_PORT) ? info.addr.port : -1);
1269 if (port == NULL)
1270 return -ENOMEM;
1271
1272 if (client->type == USER_CLIENT && info.kernel) {
1273 snd_seq_delete_port(client, port->addr.port);
1274 return -EINVAL;
1275 }
1276 if (client->type == KERNEL_CLIENT) {
1277 if ((callback = info.kernel) != NULL) {
1278 if (callback->owner)
1279 port->owner = callback->owner;
1280 port->private_data = callback->private_data;
1281 port->private_free = callback->private_free;
1282 port->event_input = callback->event_input;
1283 port->c_src.open = callback->subscribe;
1284 port->c_src.close = callback->unsubscribe;
1285 port->c_dest.open = callback->use;
1286 port->c_dest.close = callback->unuse;
1287 }
1288 }
1289
1290 info.addr = port->addr;
1291
1292 snd_seq_set_port_info(port, &info);
1293 snd_seq_system_client_ev_port_start(port->addr.client, port->addr.port);
1294
1295 if (copy_to_user(arg, &info, sizeof(info)))
1296 return -EFAULT;
1297
1298 return 0;
1299 }
1300
1301 /*
1302 * DELETE PORT ioctl()
1303 */
1304 static int snd_seq_ioctl_delete_port(struct snd_seq_client *client,
1305 void __user *arg)
1306 {
1307 struct snd_seq_port_info info;
1308 int err;
1309
1310 /* set passed parameters */
1311 if (copy_from_user(&info, arg, sizeof(info)))
1312 return -EFAULT;
1313
1314 /* it is not allowed to remove the port for an another client */
1315 if (info.addr.client != client->number)
1316 return -EPERM;
1317
1318 err = snd_seq_delete_port(client, info.addr.port);
1319 if (err >= 0)
1320 snd_seq_system_client_ev_port_exit(client->number, info.addr.port);
1321 return err;
1322 }
1323
1324
1325 /*
1326 * GET_PORT_INFO ioctl() (on any client)
1327 */
1328 static int snd_seq_ioctl_get_port_info(struct snd_seq_client *client,
1329 void __user *arg)
1330 {
1331 struct snd_seq_client *cptr;
1332 struct snd_seq_client_port *port;
1333 struct snd_seq_port_info info;
1334
1335 if (copy_from_user(&info, arg, sizeof(info)))
1336 return -EFAULT;
1337 cptr = snd_seq_client_use_ptr(info.addr.client);
1338 if (cptr == NULL)
1339 return -ENXIO;
1340
1341 port = snd_seq_port_use_ptr(cptr, info.addr.port);
1342 if (port == NULL) {
1343 snd_seq_client_unlock(cptr);
1344 return -ENOENT; /* don't change */
1345 }
1346
1347 /* get port info */
1348 snd_seq_get_port_info(port, &info);
1349 snd_seq_port_unlock(port);
1350 snd_seq_client_unlock(cptr);
1351
1352 if (copy_to_user(arg, &info, sizeof(info)))
1353 return -EFAULT;
1354 return 0;
1355 }
1356
1357
1358 /*
1359 * SET_PORT_INFO ioctl() (only ports on this/own client)
1360 */
1361 static int snd_seq_ioctl_set_port_info(struct snd_seq_client *client,
1362 void __user *arg)
1363 {
1364 struct snd_seq_client_port *port;
1365 struct snd_seq_port_info info;
1366
1367 if (copy_from_user(&info, arg, sizeof(info)))
1368 return -EFAULT;
1369
1370 if (info.addr.client != client->number) /* only set our own ports ! */
1371 return -EPERM;
1372 port = snd_seq_port_use_ptr(client, info.addr.port);
1373 if (port) {
1374 snd_seq_set_port_info(port, &info);
1375 snd_seq_port_unlock(port);
1376 }
1377 return 0;
1378 }
1379
1380
1381 /*
1382 * port subscription (connection)
1383 */
1384 #define PERM_RD (SNDRV_SEQ_PORT_CAP_READ|SNDRV_SEQ_PORT_CAP_SUBS_READ)
1385 #define PERM_WR (SNDRV_SEQ_PORT_CAP_WRITE|SNDRV_SEQ_PORT_CAP_SUBS_WRITE)
1386
1387 static int check_subscription_permission(struct snd_seq_client *client,
1388 struct snd_seq_client_port *sport,
1389 struct snd_seq_client_port *dport,
1390 struct snd_seq_port_subscribe *subs)
1391 {
1392 if (client->number != subs->sender.client &&
1393 client->number != subs->dest.client) {
1394 /* connection by third client - check export permission */
1395 if (check_port_perm(sport, SNDRV_SEQ_PORT_CAP_NO_EXPORT))
1396 return -EPERM;
1397 if (check_port_perm(dport, SNDRV_SEQ_PORT_CAP_NO_EXPORT))
1398 return -EPERM;
1399 }
1400
1401 /* check read permission */
1402 /* if sender or receiver is the subscribing client itself,
1403 * no permission check is necessary
1404 */
1405 if (client->number != subs->sender.client) {
1406 if (! check_port_perm(sport, PERM_RD))
1407 return -EPERM;
1408 }
1409 /* check write permission */
1410 if (client->number != subs->dest.client) {
1411 if (! check_port_perm(dport, PERM_WR))
1412 return -EPERM;
1413 }
1414 return 0;
1415 }
1416
1417 /*
1418 * send an subscription notify event to user client:
1419 * client must be user client.
1420 */
1421 int snd_seq_client_notify_subscription(int client, int port,
1422 struct snd_seq_port_subscribe *info,
1423 int evtype)
1424 {
1425 struct snd_seq_event event;
1426
1427 memset(&event, 0, sizeof(event));
1428 event.type = evtype;
1429 event.data.connect.dest = info->dest;
1430 event.data.connect.sender = info->sender;
1431
1432 return snd_seq_system_notify(client, port, &event); /* non-atomic */
1433 }
1434
1435
1436 /*
1437 * add to port's subscription list IOCTL interface
1438 */
1439 static int snd_seq_ioctl_subscribe_port(struct snd_seq_client *client,
1440 void __user *arg)
1441 {
1442 int result = -EINVAL;
1443 struct snd_seq_client *receiver = NULL, *sender = NULL;
1444 struct snd_seq_client_port *sport = NULL, *dport = NULL;
1445 struct snd_seq_port_subscribe subs;
1446
1447 if (copy_from_user(&subs, arg, sizeof(subs)))
1448 return -EFAULT;
1449
1450 if ((receiver = snd_seq_client_use_ptr(subs.dest.client)) == NULL)
1451 goto __end;
1452 if ((sender = snd_seq_client_use_ptr(subs.sender.client)) == NULL)
1453 goto __end;
1454 if ((sport = snd_seq_port_use_ptr(sender, subs.sender.port)) == NULL)
1455 goto __end;
1456 if ((dport = snd_seq_port_use_ptr(receiver, subs.dest.port)) == NULL)
1457 goto __end;
1458
1459 result = check_subscription_permission(client, sport, dport, &subs);
1460 if (result < 0)
1461 goto __end;
1462
1463 /* connect them */
1464 result = snd_seq_port_connect(client, sender, sport, receiver, dport, &subs);
1465 if (! result) /* broadcast announce */
1466 snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0,
1467 &subs, SNDRV_SEQ_EVENT_PORT_SUBSCRIBED);
1468 __end:
1469 if (sport)
1470 snd_seq_port_unlock(sport);
1471 if (dport)
1472 snd_seq_port_unlock(dport);
1473 if (sender)
1474 snd_seq_client_unlock(sender);
1475 if (receiver)
1476 snd_seq_client_unlock(receiver);
1477 return result;
1478 }
1479
1480
1481 /*
1482 * remove from port's subscription list
1483 */
1484 static int snd_seq_ioctl_unsubscribe_port(struct snd_seq_client *client,
1485 void __user *arg)
1486 {
1487 int result = -ENXIO;
1488 struct snd_seq_client *receiver = NULL, *sender = NULL;
1489 struct snd_seq_client_port *sport = NULL, *dport = NULL;
1490 struct snd_seq_port_subscribe subs;
1491
1492 if (copy_from_user(&subs, arg, sizeof(subs)))
1493 return -EFAULT;
1494
1495 if ((receiver = snd_seq_client_use_ptr(subs.dest.client)) == NULL)
1496 goto __end;
1497 if ((sender = snd_seq_client_use_ptr(subs.sender.client)) == NULL)
1498 goto __end;
1499 if ((sport = snd_seq_port_use_ptr(sender, subs.sender.port)) == NULL)
1500 goto __end;
1501 if ((dport = snd_seq_port_use_ptr(receiver, subs.dest.port)) == NULL)
1502 goto __end;
1503
1504 result = check_subscription_permission(client, sport, dport, &subs);
1505 if (result < 0)
1506 goto __end;
1507
1508 result = snd_seq_port_disconnect(client, sender, sport, receiver, dport, &subs);
1509 if (! result) /* broadcast announce */
1510 snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0,
1511 &subs, SNDRV_SEQ_EVENT_PORT_UNSUBSCRIBED);
1512 __end:
1513 if (sport)
1514 snd_seq_port_unlock(sport);
1515 if (dport)
1516 snd_seq_port_unlock(dport);
1517 if (sender)
1518 snd_seq_client_unlock(sender);
1519 if (receiver)
1520 snd_seq_client_unlock(receiver);
1521 return result;
1522 }
1523
1524
1525 /* CREATE_QUEUE ioctl() */
1526 static int snd_seq_ioctl_create_queue(struct snd_seq_client *client,
1527 void __user *arg)
1528 {
1529 struct snd_seq_queue_info info;
1530 int result;
1531 struct snd_seq_queue *q;
1532
1533 if (copy_from_user(&info, arg, sizeof(info)))
1534 return -EFAULT;
1535
1536 result = snd_seq_queue_alloc(client->number, info.locked, info.flags);
1537 if (result < 0)
1538 return result;
1539
1540 q = queueptr(result);
1541 if (q == NULL)
1542 return -EINVAL;
1543
1544 info.queue = q->queue;
1545 info.locked = q->locked;
1546 info.owner = q->owner;
1547
1548 /* set queue name */
1549 if (! info.name[0])
1550 snprintf(info.name, sizeof(info.name), "Queue-%d", q->queue);
1551 strlcpy(q->name, info.name, sizeof(q->name));
1552 queuefree(q);
1553
1554 if (copy_to_user(arg, &info, sizeof(info)))
1555 return -EFAULT;
1556
1557 return 0;
1558 }
1559
1560 /* DELETE_QUEUE ioctl() */
1561 static int snd_seq_ioctl_delete_queue(struct snd_seq_client *client,
1562 void __user *arg)
1563 {
1564 struct snd_seq_queue_info info;
1565
1566 if (copy_from_user(&info, arg, sizeof(info)))
1567 return -EFAULT;
1568
1569 return snd_seq_queue_delete(client->number, info.queue);
1570 }
1571
1572 /* GET_QUEUE_INFO ioctl() */
1573 static int snd_seq_ioctl_get_queue_info(struct snd_seq_client *client,
1574 void __user *arg)
1575 {
1576 struct snd_seq_queue_info info;
1577 struct snd_seq_queue *q;
1578
1579 if (copy_from_user(&info, arg, sizeof(info)))
1580 return -EFAULT;
1581
1582 q = queueptr(info.queue);
1583 if (q == NULL)
1584 return -EINVAL;
1585
1586 memset(&info, 0, sizeof(info));
1587 info.queue = q->queue;
1588 info.owner = q->owner;
1589 info.locked = q->locked;
1590 strlcpy(info.name, q->name, sizeof(info.name));
1591 queuefree(q);
1592
1593 if (copy_to_user(arg, &info, sizeof(info)))
1594 return -EFAULT;
1595
1596 return 0;
1597 }
1598
1599 /* SET_QUEUE_INFO ioctl() */
1600 static int snd_seq_ioctl_set_queue_info(struct snd_seq_client *client,
1601 void __user *arg)
1602 {
1603 struct snd_seq_queue_info info;
1604 struct snd_seq_queue *q;
1605
1606 if (copy_from_user(&info, arg, sizeof(info)))
1607 return -EFAULT;
1608
1609 if (info.owner != client->number)
1610 return -EINVAL;
1611
1612 /* change owner/locked permission */
1613 if (snd_seq_queue_check_access(info.queue, client->number)) {
1614 if (snd_seq_queue_set_owner(info.queue, client->number, info.locked) < 0)
1615 return -EPERM;
1616 if (info.locked)
1617 snd_seq_queue_use(info.queue, client->number, 1);
1618 } else {
1619 return -EPERM;
1620 }
1621
1622 q = queueptr(info.queue);
1623 if (! q)
1624 return -EINVAL;
1625 if (q->owner != client->number) {
1626 queuefree(q);
1627 return -EPERM;
1628 }
1629 strlcpy(q->name, info.name, sizeof(q->name));
1630 queuefree(q);
1631
1632 return 0;
1633 }
1634
1635 /* GET_NAMED_QUEUE ioctl() */
1636 static int snd_seq_ioctl_get_named_queue(struct snd_seq_client *client, void __user *arg)
1637 {
1638 struct snd_seq_queue_info info;
1639 struct snd_seq_queue *q;
1640
1641 if (copy_from_user(&info, arg, sizeof(info)))
1642 return -EFAULT;
1643
1644 q = snd_seq_queue_find_name(info.name);
1645 if (q == NULL)
1646 return -EINVAL;
1647 info.queue = q->queue;
1648 info.owner = q->owner;
1649 info.locked = q->locked;
1650 queuefree(q);
1651
1652 if (copy_to_user(arg, &info, sizeof(info)))
1653 return -EFAULT;
1654
1655 return 0;
1656 }
1657
1658 /* GET_QUEUE_STATUS ioctl() */
1659 static int snd_seq_ioctl_get_queue_status(struct snd_seq_client *client,
1660 void __user *arg)
1661 {
1662 struct snd_seq_queue_status status;
1663 struct snd_seq_queue *queue;
1664 struct snd_seq_timer *tmr;
1665
1666 if (copy_from_user(&status, arg, sizeof(status)))
1667 return -EFAULT;
1668
1669 queue = queueptr(status.queue);
1670 if (queue == NULL)
1671 return -EINVAL;
1672 memset(&status, 0, sizeof(status));
1673 status.queue = queue->queue;
1674
1675 tmr = queue->timer;
1676 status.events = queue->tickq->cells + queue->timeq->cells;
1677
1678 status.time = snd_seq_timer_get_cur_time(tmr);
1679 status.tick = snd_seq_timer_get_cur_tick(tmr);
1680
1681 status.running = tmr->running;
1682
1683 status.flags = queue->flags;
1684 queuefree(queue);
1685
1686 if (copy_to_user(arg, &status, sizeof(status)))
1687 return -EFAULT;
1688 return 0;
1689 }
1690
1691
1692 /* GET_QUEUE_TEMPO ioctl() */
1693 static int snd_seq_ioctl_get_queue_tempo(struct snd_seq_client *client,
1694 void __user *arg)
1695 {
1696 struct snd_seq_queue_tempo tempo;
1697 struct snd_seq_queue *queue;
1698 struct snd_seq_timer *tmr;
1699
1700 if (copy_from_user(&tempo, arg, sizeof(tempo)))
1701 return -EFAULT;
1702
1703 queue = queueptr(tempo.queue);
1704 if (queue == NULL)
1705 return -EINVAL;
1706 memset(&tempo, 0, sizeof(tempo));
1707 tempo.queue = queue->queue;
1708
1709 tmr = queue->timer;
1710
1711 tempo.tempo = tmr->tempo;
1712 tempo.ppq = tmr->ppq;
1713 tempo.skew_value = tmr->skew;
1714 tempo.skew_base = tmr->skew_base;
1715 queuefree(queue);
1716
1717 if (copy_to_user(arg, &tempo, sizeof(tempo)))
1718 return -EFAULT;
1719 return 0;
1720 }
1721
1722
1723 /* SET_QUEUE_TEMPO ioctl() */
1724 int snd_seq_set_queue_tempo(int client, struct snd_seq_queue_tempo *tempo)
1725 {
1726 if (!snd_seq_queue_check_access(tempo->queue, client))
1727 return -EPERM;
1728 return snd_seq_queue_timer_set_tempo(tempo->queue, client, tempo);
1729 }
1730
1731 EXPORT_SYMBOL(snd_seq_set_queue_tempo);
1732
1733 static int snd_seq_ioctl_set_queue_tempo(struct snd_seq_client *client,
1734 void __user *arg)
1735 {
1736 int result;
1737 struct snd_seq_queue_tempo tempo;
1738
1739 if (copy_from_user(&tempo, arg, sizeof(tempo)))
1740 return -EFAULT;
1741
1742 result = snd_seq_set_queue_tempo(client->number, &tempo);
1743 return result < 0 ? result : 0;
1744 }
1745
1746
1747 /* GET_QUEUE_TIMER ioctl() */
1748 static int snd_seq_ioctl_get_queue_timer(struct snd_seq_client *client,
1749 void __user *arg)
1750 {
1751 struct snd_seq_queue_timer timer;
1752 struct snd_seq_queue *queue;
1753 struct snd_seq_timer *tmr;
1754
1755 if (copy_from_user(&timer, arg, sizeof(timer)))
1756 return -EFAULT;
1757
1758 queue = queueptr(timer.queue);
1759 if (queue == NULL)
1760 return -EINVAL;
1761
1762 if (mutex_lock_interruptible(&queue->timer_mutex)) {
1763 queuefree(queue);
1764 return -ERESTARTSYS;
1765 }
1766 tmr = queue->timer;
1767 memset(&timer, 0, sizeof(timer));
1768 timer.queue = queue->queue;
1769
1770 timer.type = tmr->type;
1771 if (tmr->type == SNDRV_SEQ_TIMER_ALSA) {
1772 timer.u.alsa.id = tmr->alsa_id;
1773 timer.u.alsa.resolution = tmr->preferred_resolution;
1774 }
1775 mutex_unlock(&queue->timer_mutex);
1776 queuefree(queue);
1777
1778 if (copy_to_user(arg, &timer, sizeof(timer)))
1779 return -EFAULT;
1780 return 0;
1781 }
1782
1783
1784 /* SET_QUEUE_TIMER ioctl() */
1785 static int snd_seq_ioctl_set_queue_timer(struct snd_seq_client *client,
1786 void __user *arg)
1787 {
1788 int result = 0;
1789 struct snd_seq_queue_timer timer;
1790
1791 if (copy_from_user(&timer, arg, sizeof(timer)))
1792 return -EFAULT;
1793
1794 if (timer.type != SNDRV_SEQ_TIMER_ALSA)
1795 return -EINVAL;
1796
1797 if (snd_seq_queue_check_access(timer.queue, client->number)) {
1798 struct snd_seq_queue *q;
1799 struct snd_seq_timer *tmr;
1800
1801 q = queueptr(timer.queue);
1802 if (q == NULL)
1803 return -ENXIO;
1804 if (mutex_lock_interruptible(&q->timer_mutex)) {
1805 queuefree(q);
1806 return -ERESTARTSYS;
1807 }
1808 tmr = q->timer;
1809 snd_seq_queue_timer_close(timer.queue);
1810 tmr->type = timer.type;
1811 if (tmr->type == SNDRV_SEQ_TIMER_ALSA) {
1812 tmr->alsa_id = timer.u.alsa.id;
1813 tmr->preferred_resolution = timer.u.alsa.resolution;
1814 }
1815 result = snd_seq_queue_timer_open(timer.queue);
1816 mutex_unlock(&q->timer_mutex);
1817 queuefree(q);
1818 } else {
1819 return -EPERM;
1820 }
1821
1822 return result;
1823 }
1824
1825
1826 /* GET_QUEUE_CLIENT ioctl() */
1827 static int snd_seq_ioctl_get_queue_client(struct snd_seq_client *client,
1828 void __user *arg)
1829 {
1830 struct snd_seq_queue_client info;
1831 int used;
1832
1833 if (copy_from_user(&info, arg, sizeof(info)))
1834 return -EFAULT;
1835
1836 used = snd_seq_queue_is_used(info.queue, client->number);
1837 if (used < 0)
1838 return -EINVAL;
1839 info.used = used;
1840 info.client = client->number;
1841
1842 if (copy_to_user(arg, &info, sizeof(info)))
1843 return -EFAULT;
1844 return 0;
1845 }
1846
1847
1848 /* SET_QUEUE_CLIENT ioctl() */
1849 static int snd_seq_ioctl_set_queue_client(struct snd_seq_client *client,
1850 void __user *arg)
1851 {
1852 int err;
1853 struct snd_seq_queue_client info;
1854
1855 if (copy_from_user(&info, arg, sizeof(info)))
1856 return -EFAULT;
1857
1858 if (info.used >= 0) {
1859 err = snd_seq_queue_use(info.queue, client->number, info.used);
1860 if (err < 0)
1861 return err;
1862 }
1863
1864 return snd_seq_ioctl_get_queue_client(client, arg);
1865 }
1866
1867
1868 /* GET_CLIENT_POOL ioctl() */
1869 static int snd_seq_ioctl_get_client_pool(struct snd_seq_client *client,
1870 void __user *arg)
1871 {
1872 struct snd_seq_client_pool info;
1873 struct snd_seq_client *cptr;
1874
1875 if (copy_from_user(&info, arg, sizeof(info)))
1876 return -EFAULT;
1877
1878 cptr = snd_seq_client_use_ptr(info.client);
1879 if (cptr == NULL)
1880 return -ENOENT;
1881 memset(&info, 0, sizeof(info));
1882 info.client = cptr->number;
1883 info.output_pool = cptr->pool->size;
1884 info.output_room = cptr->pool->room;
1885 info.output_free = info.output_pool;
1886 info.output_free = snd_seq_unused_cells(cptr->pool);
1887 if (cptr->type == USER_CLIENT) {
1888 info.input_pool = cptr->data.user.fifo_pool_size;
1889 info.input_free = info.input_pool;
1890 if (cptr->data.user.fifo)
1891 info.input_free = snd_seq_unused_cells(cptr->data.user.fifo->pool);
1892 } else {
1893 info.input_pool = 0;
1894 info.input_free = 0;
1895 }
1896 snd_seq_client_unlock(cptr);
1897
1898 if (copy_to_user(arg, &info, sizeof(info)))
1899 return -EFAULT;
1900 return 0;
1901 }
1902
1903 /* SET_CLIENT_POOL ioctl() */
1904 static int snd_seq_ioctl_set_client_pool(struct snd_seq_client *client,
1905 void __user *arg)
1906 {
1907 struct snd_seq_client_pool info;
1908 int rc;
1909
1910 if (copy_from_user(&info, arg, sizeof(info)))
1911 return -EFAULT;
1912
1913 if (client->number != info.client)
1914 return -EINVAL; /* can't change other clients */
1915
1916 if (info.output_pool >= 1 && info.output_pool <= SNDRV_SEQ_MAX_EVENTS &&
1917 (! snd_seq_write_pool_allocated(client) ||
1918 info.output_pool != client->pool->size)) {
1919 if (snd_seq_write_pool_allocated(client)) {
1920 /* remove all existing cells */
1921 snd_seq_queue_client_leave_cells(client->number);
1922 snd_seq_pool_done(client->pool);
1923 }
1924 client->pool->size = info.output_pool;
1925 rc = snd_seq_pool_init(client->pool);
1926 if (rc < 0)
1927 return rc;
1928 }
1929 if (client->type == USER_CLIENT && client->data.user.fifo != NULL &&
1930 info.input_pool >= 1 &&
1931 info.input_pool <= SNDRV_SEQ_MAX_CLIENT_EVENTS &&
1932 info.input_pool != client->data.user.fifo_pool_size) {
1933 /* change pool size */
1934 rc = snd_seq_fifo_resize(client->data.user.fifo, info.input_pool);
1935 if (rc < 0)
1936 return rc;
1937 client->data.user.fifo_pool_size = info.input_pool;
1938 }
1939 if (info.output_room >= 1 &&
1940 info.output_room <= client->pool->size) {
1941 client->pool->room = info.output_room;
1942 }
1943
1944 return snd_seq_ioctl_get_client_pool(client, arg);
1945 }
1946
1947
1948 /* REMOVE_EVENTS ioctl() */
1949 static int snd_seq_ioctl_remove_events(struct snd_seq_client *client,
1950 void __user *arg)
1951 {
1952 struct snd_seq_remove_events info;
1953
1954 if (copy_from_user(&info, arg, sizeof(info)))
1955 return -EFAULT;
1956
1957 /*
1958 * Input mostly not implemented XXX.
1959 */
1960 if (info.remove_mode & SNDRV_SEQ_REMOVE_INPUT) {
1961 /*
1962 * No restrictions so for a user client we can clear
1963 * the whole fifo
1964 */
1965 if (client->type == USER_CLIENT)
1966 snd_seq_fifo_clear(client->data.user.fifo);
1967 }
1968
1969 if (info.remove_mode & SNDRV_SEQ_REMOVE_OUTPUT)
1970 snd_seq_queue_remove_cells(client->number, &info);
1971
1972 return 0;
1973 }
1974
1975
1976 /*
1977 * get subscription info
1978 */
1979 static int snd_seq_ioctl_get_subscription(struct snd_seq_client *client,
1980 void __user *arg)
1981 {
1982 int result;
1983 struct snd_seq_client *sender = NULL;
1984 struct snd_seq_client_port *sport = NULL;
1985 struct snd_seq_port_subscribe subs;
1986 struct snd_seq_subscribers *p;
1987
1988 if (copy_from_user(&subs, arg, sizeof(subs)))
1989 return -EFAULT;
1990
1991 result = -EINVAL;
1992 if ((sender = snd_seq_client_use_ptr(subs.sender.client)) == NULL)
1993 goto __end;
1994 if ((sport = snd_seq_port_use_ptr(sender, subs.sender.port)) == NULL)
1995 goto __end;
1996 p = snd_seq_port_get_subscription(&sport->c_src, &subs.dest);
1997 if (p) {
1998 result = 0;
1999 subs = p->info;
2000 } else
2001 result = -ENOENT;
2002
2003 __end:
2004 if (sport)
2005 snd_seq_port_unlock(sport);
2006 if (sender)
2007 snd_seq_client_unlock(sender);
2008 if (result >= 0) {
2009 if (copy_to_user(arg, &subs, sizeof(subs)))
2010 return -EFAULT;
2011 }
2012 return result;
2013 }
2014
2015
2016 /*
2017 * get subscription info - check only its presence
2018 */
2019 static int snd_seq_ioctl_query_subs(struct snd_seq_client *client,
2020 void __user *arg)
2021 {
2022 int result = -ENXIO;
2023 struct snd_seq_client *cptr = NULL;
2024 struct snd_seq_client_port *port = NULL;
2025 struct snd_seq_query_subs subs;
2026 struct snd_seq_port_subs_info *group;
2027 struct list_head *p;
2028 int i;
2029
2030 if (copy_from_user(&subs, arg, sizeof(subs)))
2031 return -EFAULT;
2032
2033 if ((cptr = snd_seq_client_use_ptr(subs.root.client)) == NULL)
2034 goto __end;
2035 if ((port = snd_seq_port_use_ptr(cptr, subs.root.port)) == NULL)
2036 goto __end;
2037
2038 switch (subs.type) {
2039 case SNDRV_SEQ_QUERY_SUBS_READ:
2040 group = &port->c_src;
2041 break;
2042 case SNDRV_SEQ_QUERY_SUBS_WRITE:
2043 group = &port->c_dest;
2044 break;
2045 default:
2046 goto __end;
2047 }
2048
2049 down_read(&group->list_mutex);
2050 /* search for the subscriber */
2051 subs.num_subs = group->count;
2052 i = 0;
2053 result = -ENOENT;
2054 list_for_each(p, &group->list_head) {
2055 if (i++ == subs.index) {
2056 /* found! */
2057 struct snd_seq_subscribers *s;
2058 if (subs.type == SNDRV_SEQ_QUERY_SUBS_READ) {
2059 s = list_entry(p, struct snd_seq_subscribers, src_list);
2060 subs.addr = s->info.dest;
2061 } else {
2062 s = list_entry(p, struct snd_seq_subscribers, dest_list);
2063 subs.addr = s->info.sender;
2064 }
2065 subs.flags = s->info.flags;
2066 subs.queue = s->info.queue;
2067 result = 0;
2068 break;
2069 }
2070 }
2071 up_read(&group->list_mutex);
2072
2073 __end:
2074 if (port)
2075 snd_seq_port_unlock(port);
2076 if (cptr)
2077 snd_seq_client_unlock(cptr);
2078 if (result >= 0) {
2079 if (copy_to_user(arg, &subs, sizeof(subs)))
2080 return -EFAULT;
2081 }
2082 return result;
2083 }
2084
2085
2086 /*
2087 * query next client
2088 */
2089 static int snd_seq_ioctl_query_next_client(struct snd_seq_client *client,
2090 void __user *arg)
2091 {
2092 struct snd_seq_client *cptr = NULL;
2093 struct snd_seq_client_info info;
2094
2095 if (copy_from_user(&info, arg, sizeof(info)))
2096 return -EFAULT;
2097
2098 /* search for next client */
2099 info.client++;
2100 if (info.client < 0)
2101 info.client = 0;
2102 for (; info.client < SNDRV_SEQ_MAX_CLIENTS; info.client++) {
2103 cptr = snd_seq_client_use_ptr(info.client);
2104 if (cptr)
2105 break; /* found */
2106 }
2107 if (cptr == NULL)
2108 return -ENOENT;
2109
2110 get_client_info(cptr, &info);
2111 snd_seq_client_unlock(cptr);
2112
2113 if (copy_to_user(arg, &info, sizeof(info)))
2114 return -EFAULT;
2115 return 0;
2116 }
2117
2118 /*
2119 * query next port
2120 */
2121 static int snd_seq_ioctl_query_next_port(struct snd_seq_client *client,
2122 void __user *arg)
2123 {
2124 struct snd_seq_client *cptr;
2125 struct snd_seq_client_port *port = NULL;
2126 struct snd_seq_port_info info;
2127
2128 if (copy_from_user(&info, arg, sizeof(info)))
2129 return -EFAULT;
2130 cptr = snd_seq_client_use_ptr(info.addr.client);
2131 if (cptr == NULL)
2132 return -ENXIO;
2133
2134 /* search for next port */
2135 info.addr.port++;
2136 port = snd_seq_port_query_nearest(cptr, &info);
2137 if (port == NULL) {
2138 snd_seq_client_unlock(cptr);
2139 return -ENOENT;
2140 }
2141
2142 /* get port info */
2143 info.addr = port->addr;
2144 snd_seq_get_port_info(port, &info);
2145 snd_seq_port_unlock(port);
2146 snd_seq_client_unlock(cptr);
2147
2148 if (copy_to_user(arg, &info, sizeof(info)))
2149 return -EFAULT;
2150 return 0;
2151 }
2152
2153 /* -------------------------------------------------------- */
2154
2155 static struct seq_ioctl_table {
2156 unsigned int cmd;
2157 int (*func)(struct snd_seq_client *client, void __user * arg);
2158 } ioctl_tables[] = {
2159 { SNDRV_SEQ_IOCTL_SYSTEM_INFO, snd_seq_ioctl_system_info },
2160 { SNDRV_SEQ_IOCTL_RUNNING_MODE, snd_seq_ioctl_running_mode },
2161 { SNDRV_SEQ_IOCTL_GET_CLIENT_INFO, snd_seq_ioctl_get_client_info },
2162 { SNDRV_SEQ_IOCTL_SET_CLIENT_INFO, snd_seq_ioctl_set_client_info },
2163 { SNDRV_SEQ_IOCTL_CREATE_PORT, snd_seq_ioctl_create_port },
2164 { SNDRV_SEQ_IOCTL_DELETE_PORT, snd_seq_ioctl_delete_port },
2165 { SNDRV_SEQ_IOCTL_GET_PORT_INFO, snd_seq_ioctl_get_port_info },
2166 { SNDRV_SEQ_IOCTL_SET_PORT_INFO, snd_seq_ioctl_set_port_info },
2167 { SNDRV_SEQ_IOCTL_SUBSCRIBE_PORT, snd_seq_ioctl_subscribe_port },
2168 { SNDRV_SEQ_IOCTL_UNSUBSCRIBE_PORT, snd_seq_ioctl_unsubscribe_port },
2169 { SNDRV_SEQ_IOCTL_CREATE_QUEUE, snd_seq_ioctl_create_queue },
2170 { SNDRV_SEQ_IOCTL_DELETE_QUEUE, snd_seq_ioctl_delete_queue },
2171 { SNDRV_SEQ_IOCTL_GET_QUEUE_INFO, snd_seq_ioctl_get_queue_info },
2172 { SNDRV_SEQ_IOCTL_SET_QUEUE_INFO, snd_seq_ioctl_set_queue_info },
2173 { SNDRV_SEQ_IOCTL_GET_NAMED_QUEUE, snd_seq_ioctl_get_named_queue },
2174 { SNDRV_SEQ_IOCTL_GET_QUEUE_STATUS, snd_seq_ioctl_get_queue_status },
2175 { SNDRV_SEQ_IOCTL_GET_QUEUE_TEMPO, snd_seq_ioctl_get_queue_tempo },
2176 { SNDRV_SEQ_IOCTL_SET_QUEUE_TEMPO, snd_seq_ioctl_set_queue_tempo },
2177 { SNDRV_SEQ_IOCTL_GET_QUEUE_TIMER, snd_seq_ioctl_get_queue_timer },
2178 { SNDRV_SEQ_IOCTL_SET_QUEUE_TIMER, snd_seq_ioctl_set_queue_timer },
2179 { SNDRV_SEQ_IOCTL_GET_QUEUE_CLIENT, snd_seq_ioctl_get_queue_client },
2180 { SNDRV_SEQ_IOCTL_SET_QUEUE_CLIENT, snd_seq_ioctl_set_queue_client },
2181 { SNDRV_SEQ_IOCTL_GET_CLIENT_POOL, snd_seq_ioctl_get_client_pool },
2182 { SNDRV_SEQ_IOCTL_SET_CLIENT_POOL, snd_seq_ioctl_set_client_pool },
2183 { SNDRV_SEQ_IOCTL_GET_SUBSCRIPTION, snd_seq_ioctl_get_subscription },
2184 { SNDRV_SEQ_IOCTL_QUERY_NEXT_CLIENT, snd_seq_ioctl_query_next_client },
2185 { SNDRV_SEQ_IOCTL_QUERY_NEXT_PORT, snd_seq_ioctl_query_next_port },
2186 { SNDRV_SEQ_IOCTL_REMOVE_EVENTS, snd_seq_ioctl_remove_events },
2187 { SNDRV_SEQ_IOCTL_QUERY_SUBS, snd_seq_ioctl_query_subs },
2188 { 0, NULL },
2189 };
2190
2191 static int snd_seq_do_ioctl(struct snd_seq_client *client, unsigned int cmd,
2192 void __user *arg)
2193 {
2194 struct seq_ioctl_table *p;
2195
2196 switch (cmd) {
2197 case SNDRV_SEQ_IOCTL_PVERSION:
2198 /* return sequencer version number */
2199 return put_user(SNDRV_SEQ_VERSION, (int __user *)arg) ? -EFAULT : 0;
2200 case SNDRV_SEQ_IOCTL_CLIENT_ID:
2201 /* return the id of this client */
2202 return put_user(client->number, (int __user *)arg) ? -EFAULT : 0;
2203 }
2204
2205 if (! arg)
2206 return -EFAULT;
2207 for (p = ioctl_tables; p->cmd; p++) {
2208 if (p->cmd == cmd)
2209 return p->func(client, arg);
2210 }
2211 pr_debug("ALSA: seq unknown ioctl() 0x%x (type='%c', number=0x%02x)\n",
2212 cmd, _IOC_TYPE(cmd), _IOC_NR(cmd));
2213 return -ENOTTY;
2214 }
2215
2216
2217 static long snd_seq_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
2218 {
2219 struct snd_seq_client *client = file->private_data;
2220
2221 if (snd_BUG_ON(!client))
2222 return -ENXIO;
2223
2224 return snd_seq_do_ioctl(client, cmd, (void __user *) arg);
2225 }
2226
2227 #ifdef CONFIG_COMPAT
2228 #include "seq_compat.c"
2229 #else
2230 #define snd_seq_ioctl_compat NULL
2231 #endif
2232
2233 /* -------------------------------------------------------- */
2234
2235
2236 /* exported to kernel modules */
2237 int snd_seq_create_kernel_client(struct snd_card *card, int client_index,
2238 const char *name_fmt, ...)
2239 {
2240 struct snd_seq_client *client;
2241 va_list args;
2242
2243 if (snd_BUG_ON(in_interrupt()))
2244 return -EBUSY;
2245
2246 if (card && client_index >= SNDRV_SEQ_CLIENTS_PER_CARD)
2247 return -EINVAL;
2248 if (card == NULL && client_index >= SNDRV_SEQ_GLOBAL_CLIENTS)
2249 return -EINVAL;
2250
2251 if (mutex_lock_interruptible(&register_mutex))
2252 return -ERESTARTSYS;
2253
2254 if (card) {
2255 client_index += SNDRV_SEQ_GLOBAL_CLIENTS
2256 + card->number * SNDRV_SEQ_CLIENTS_PER_CARD;
2257 if (client_index >= SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN)
2258 client_index = -1;
2259 }
2260
2261 /* empty write queue as default */
2262 client = seq_create_client1(client_index, 0);
2263 if (client == NULL) {
2264 mutex_unlock(&register_mutex);
2265 return -EBUSY; /* failure code */
2266 }
2267 usage_alloc(&client_usage, 1);
2268
2269 client->accept_input = 1;
2270 client->accept_output = 1;
2271
2272 va_start(args, name_fmt);
2273 vsnprintf(client->name, sizeof(client->name), name_fmt, args);
2274 va_end(args);
2275
2276 client->type = KERNEL_CLIENT;
2277 mutex_unlock(&register_mutex);
2278
2279 /* make others aware this new client */
2280 snd_seq_system_client_ev_client_start(client->number);
2281
2282 /* return client number to caller */
2283 return client->number;
2284 }
2285
2286 EXPORT_SYMBOL(snd_seq_create_kernel_client);
2287
2288 /* exported to kernel modules */
2289 int snd_seq_delete_kernel_client(int client)
2290 {
2291 struct snd_seq_client *ptr;
2292
2293 if (snd_BUG_ON(in_interrupt()))
2294 return -EBUSY;
2295
2296 ptr = clientptr(client);
2297 if (ptr == NULL)
2298 return -EINVAL;
2299
2300 seq_free_client(ptr);
2301 kfree(ptr);
2302 return 0;
2303 }
2304
2305 EXPORT_SYMBOL(snd_seq_delete_kernel_client);
2306
2307 /* skeleton to enqueue event, called from snd_seq_kernel_client_enqueue
2308 * and snd_seq_kernel_client_enqueue_blocking
2309 */
2310 static int kernel_client_enqueue(int client, struct snd_seq_event *ev,
2311 struct file *file, int blocking,
2312 int atomic, int hop)
2313 {
2314 struct snd_seq_client *cptr;
2315 int result;
2316
2317 if (snd_BUG_ON(!ev))
2318 return -EINVAL;
2319
2320 if (ev->type == SNDRV_SEQ_EVENT_NONE)
2321 return 0; /* ignore this */
2322 if (ev->type == SNDRV_SEQ_EVENT_KERNEL_ERROR)
2323 return -EINVAL; /* quoted events can't be enqueued */
2324
2325 /* fill in client number */
2326 ev->source.client = client;
2327
2328 if (check_event_type_and_length(ev))
2329 return -EINVAL;
2330
2331 cptr = snd_seq_client_use_ptr(client);
2332 if (cptr == NULL)
2333 return -EINVAL;
2334
2335 if (! cptr->accept_output)
2336 result = -EPERM;
2337 else /* send it */
2338 result = snd_seq_client_enqueue_event(cptr, ev, file, blocking, atomic, hop);
2339
2340 snd_seq_client_unlock(cptr);
2341 return result;
2342 }
2343
2344 /*
2345 * exported, called by kernel clients to enqueue events (w/o blocking)
2346 *
2347 * RETURN VALUE: zero if succeed, negative if error
2348 */
2349 int snd_seq_kernel_client_enqueue(int client, struct snd_seq_event * ev,
2350 int atomic, int hop)
2351 {
2352 return kernel_client_enqueue(client, ev, NULL, 0, atomic, hop);
2353 }
2354
2355 EXPORT_SYMBOL(snd_seq_kernel_client_enqueue);
2356
2357 /*
2358 * exported, called by kernel clients to enqueue events (with blocking)
2359 *
2360 * RETURN VALUE: zero if succeed, negative if error
2361 */
2362 int snd_seq_kernel_client_enqueue_blocking(int client, struct snd_seq_event * ev,
2363 struct file *file,
2364 int atomic, int hop)
2365 {
2366 return kernel_client_enqueue(client, ev, file, 1, atomic, hop);
2367 }
2368
2369 EXPORT_SYMBOL(snd_seq_kernel_client_enqueue_blocking);
2370
2371 /*
2372 * exported, called by kernel clients to dispatch events directly to other
2373 * clients, bypassing the queues. Event time-stamp will be updated.
2374 *
2375 * RETURN VALUE: negative = delivery failed,
2376 * zero, or positive: the number of delivered events
2377 */
2378 int snd_seq_kernel_client_dispatch(int client, struct snd_seq_event * ev,
2379 int atomic, int hop)
2380 {
2381 struct snd_seq_client *cptr;
2382 int result;
2383
2384 if (snd_BUG_ON(!ev))
2385 return -EINVAL;
2386
2387 /* fill in client number */
2388 ev->queue = SNDRV_SEQ_QUEUE_DIRECT;
2389 ev->source.client = client;
2390
2391 if (check_event_type_and_length(ev))
2392 return -EINVAL;
2393
2394 cptr = snd_seq_client_use_ptr(client);
2395 if (cptr == NULL)
2396 return -EINVAL;
2397
2398 if (!cptr->accept_output)
2399 result = -EPERM;
2400 else
2401 result = snd_seq_deliver_event(cptr, ev, atomic, hop);
2402
2403 snd_seq_client_unlock(cptr);
2404 return result;
2405 }
2406
2407 EXPORT_SYMBOL(snd_seq_kernel_client_dispatch);
2408
2409 /*
2410 * exported, called by kernel clients to perform same functions as with
2411 * userland ioctl()
2412 */
2413 int snd_seq_kernel_client_ctl(int clientid, unsigned int cmd, void *arg)
2414 {
2415 struct snd_seq_client *client;
2416 mm_segment_t fs;
2417 int result;
2418
2419 client = clientptr(clientid);
2420 if (client == NULL)
2421 return -ENXIO;
2422 fs = snd_enter_user();
2423 result = snd_seq_do_ioctl(client, cmd, (void __force __user *)arg);
2424 snd_leave_user(fs);
2425 return result;
2426 }
2427
2428 EXPORT_SYMBOL(snd_seq_kernel_client_ctl);
2429
2430 /* exported (for OSS emulator) */
2431 int snd_seq_kernel_client_write_poll(int clientid, struct file *file, poll_table *wait)
2432 {
2433 struct snd_seq_client *client;
2434
2435 client = clientptr(clientid);
2436 if (client == NULL)
2437 return -ENXIO;
2438
2439 if (! snd_seq_write_pool_allocated(client))
2440 return 1;
2441 if (snd_seq_pool_poll_wait(client->pool, file, wait))
2442 return 1;
2443 return 0;
2444 }
2445
2446 EXPORT_SYMBOL(snd_seq_kernel_client_write_poll);
2447
2448 /*---------------------------------------------------------------------------*/
2449
2450 #ifdef CONFIG_PROC_FS
2451 /*
2452 * /proc interface
2453 */
2454 static void snd_seq_info_dump_subscribers(struct snd_info_buffer *buffer,
2455 struct snd_seq_port_subs_info *group,
2456 int is_src, char *msg)
2457 {
2458 struct list_head *p;
2459 struct snd_seq_subscribers *s;
2460 int count = 0;
2461
2462 down_read(&group->list_mutex);
2463 if (list_empty(&group->list_head)) {
2464 up_read(&group->list_mutex);
2465 return;
2466 }
2467 snd_iprintf(buffer, msg);
2468 list_for_each(p, &group->list_head) {
2469 if (is_src)
2470 s = list_entry(p, struct snd_seq_subscribers, src_list);
2471 else
2472 s = list_entry(p, struct snd_seq_subscribers, dest_list);
2473 if (count++)
2474 snd_iprintf(buffer, ", ");
2475 snd_iprintf(buffer, "%d:%d",
2476 is_src ? s->info.dest.client : s->info.sender.client,
2477 is_src ? s->info.dest.port : s->info.sender.port);
2478 if (s->info.flags & SNDRV_SEQ_PORT_SUBS_TIMESTAMP)
2479 snd_iprintf(buffer, "[%c:%d]", ((s->info.flags & SNDRV_SEQ_PORT_SUBS_TIME_REAL) ? 'r' : 't'), s->info.queue);
2480 if (group->exclusive)
2481 snd_iprintf(buffer, "[ex]");
2482 }
2483 up_read(&group->list_mutex);
2484 snd_iprintf(buffer, "\n");
2485 }
2486
2487 #define FLAG_PERM_RD(perm) ((perm) & SNDRV_SEQ_PORT_CAP_READ ? ((perm) & SNDRV_SEQ_PORT_CAP_SUBS_READ ? 'R' : 'r') : '-')
2488 #define FLAG_PERM_WR(perm) ((perm) & SNDRV_SEQ_PORT_CAP_WRITE ? ((perm) & SNDRV_SEQ_PORT_CAP_SUBS_WRITE ? 'W' : 'w') : '-')
2489 #define FLAG_PERM_EX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_NO_EXPORT ? '-' : 'e')
2490
2491 #define FLAG_PERM_DUPLEX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_DUPLEX ? 'X' : '-')
2492
2493 static void snd_seq_info_dump_ports(struct snd_info_buffer *buffer,
2494 struct snd_seq_client *client)
2495 {
2496 struct snd_seq_client_port *p;
2497
2498 mutex_lock(&client->ports_mutex);
2499 list_for_each_entry(p, &client->ports_list_head, list) {
2500 snd_iprintf(buffer, " Port %3d : \"%s\" (%c%c%c%c)\n",
2501 p->addr.port, p->name,
2502 FLAG_PERM_RD(p->capability),
2503 FLAG_PERM_WR(p->capability),
2504 FLAG_PERM_EX(p->capability),
2505 FLAG_PERM_DUPLEX(p->capability));
2506 snd_seq_info_dump_subscribers(buffer, &p->c_src, 1, " Connecting To: ");
2507 snd_seq_info_dump_subscribers(buffer, &p->c_dest, 0, " Connected From: ");
2508 }
2509 mutex_unlock(&client->ports_mutex);
2510 }
2511
2512
2513 /* exported to seq_info.c */
2514 void snd_seq_info_clients_read(struct snd_info_entry *entry,
2515 struct snd_info_buffer *buffer)
2516 {
2517 int c;
2518 struct snd_seq_client *client;
2519
2520 snd_iprintf(buffer, "Client info\n");
2521 snd_iprintf(buffer, " cur clients : %d\n", client_usage.cur);
2522 snd_iprintf(buffer, " peak clients : %d\n", client_usage.peak);
2523 snd_iprintf(buffer, " max clients : %d\n", SNDRV_SEQ_MAX_CLIENTS);
2524 snd_iprintf(buffer, "\n");
2525
2526 /* list the client table */
2527 for (c = 0; c < SNDRV_SEQ_MAX_CLIENTS; c++) {
2528 client = snd_seq_client_use_ptr(c);
2529 if (client == NULL)
2530 continue;
2531 if (client->type == NO_CLIENT) {
2532 snd_seq_client_unlock(client);
2533 continue;
2534 }
2535
2536 snd_iprintf(buffer, "Client %3d : \"%s\" [%s]\n",
2537 c, client->name,
2538 client->type == USER_CLIENT ? "User" : "Kernel");
2539 snd_seq_info_dump_ports(buffer, client);
2540 if (snd_seq_write_pool_allocated(client)) {
2541 snd_iprintf(buffer, " Output pool :\n");
2542 snd_seq_info_pool(buffer, client->pool, " ");
2543 }
2544 if (client->type == USER_CLIENT && client->data.user.fifo &&
2545 client->data.user.fifo->pool) {
2546 snd_iprintf(buffer, " Input pool :\n");
2547 snd_seq_info_pool(buffer, client->data.user.fifo->pool, " ");
2548 }
2549 snd_seq_client_unlock(client);
2550 }
2551 }
2552 #endif /* CONFIG_PROC_FS */
2553
2554 /*---------------------------------------------------------------------------*/
2555
2556
2557 /*
2558 * REGISTRATION PART
2559 */
2560
2561 static const struct file_operations snd_seq_f_ops =
2562 {
2563 .owner = THIS_MODULE,
2564 .read = snd_seq_read,
2565 .write = snd_seq_write,
2566 .open = snd_seq_open,
2567 .release = snd_seq_release,
2568 .llseek = no_llseek,
2569 .poll = snd_seq_poll,
2570 .unlocked_ioctl = snd_seq_ioctl,
2571 .compat_ioctl = snd_seq_ioctl_compat,
2572 };
2573
2574 static struct device seq_dev;
2575
2576 /*
2577 * register sequencer device
2578 */
2579 int __init snd_sequencer_device_init(void)
2580 {
2581 int err;
2582
2583 snd_device_initialize(&seq_dev, NULL);
2584 dev_set_name(&seq_dev, "seq");
2585
2586 if (mutex_lock_interruptible(&register_mutex))
2587 return -ERESTARTSYS;
2588
2589 err = snd_register_device(SNDRV_DEVICE_TYPE_SEQUENCER, NULL, 0,
2590 &snd_seq_f_ops, NULL, &seq_dev);
2591 if (err < 0) {
2592 mutex_unlock(&register_mutex);
2593 put_device(&seq_dev);
2594 return err;
2595 }
2596
2597 mutex_unlock(&register_mutex);
2598
2599 return 0;
2600 }
2601
2602
2603
2604 /*
2605 * unregister sequencer device
2606 */
2607 void __exit snd_sequencer_device_done(void)
2608 {
2609 snd_unregister_device(&seq_dev);
2610 put_device(&seq_dev);
2611 }
Linux kernel - Deliverables
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